Use maps.Copy for simpler map handling (#7009)

Signed-off-by: eveneast <qcqs@foxmail.com>

.github/workflows/ci.yml

@@ -12,6 +12,10 @@ on:
       - master
       - 2.*
 
+env:
+  # https://github.com/actions/setup-go/issues/491
+  GOTOOLCHAIN: local
+
 jobs:
   test:
     strategy:
@@ -23,17 +27,13 @@ jobs:
           - mac
           - windows
         go:
-          - '1.22'
+          - '1.24'
-          - '1.23'
 
         include:
         # Set the minimum Go patch version for the given Go minor
         # Usable via ${{ matrix.GO_SEMVER }}
-        - go: '1.22'
+        - go: '1.24'
-          GO_SEMVER: '~1.22.3'
+          GO_SEMVER: '~1.24.1'
-
-        - go: '1.23'
-          GO_SEMVER: '~1.23.0'
 
         # Set some variables per OS, usable via ${{ matrix.VAR }}
         # OS_LABEL: the VM label from GitHub Actions (see https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories)
@@ -99,7 +99,7 @@ jobs:
       env:
         CGO_ENABLED: 0
       run: |
-        go build -tags nobadger -trimpath -ldflags="-w -s" -v
+        go build -tags nobadger,nomysql,nopgx -trimpath -ldflags="-w -s" -v
 
     - name: Smoke test Caddy
       working-directory: ./cmd/caddy
@@ -122,7 +122,7 @@ jobs:
       # continue-on-error: true
       run: |
         # (go test -v -coverprofile=cover-profile.out -race ./... 2>&1) > test-results/test-result.out
-        go test -tags nobadger -v -coverprofile="cover-profile.out" -short -race ./...
+        go test -tags nobadger,nomysql,nopgx -v -coverprofile="cover-profile.out" -short -race ./...
         # echo "status=$?" >> $GITHUB_OUTPUT
 
     # Relevant step if we reinvestigate publishing test/coverage reports
@@ -170,7 +170,7 @@ jobs:
           retries=3
           exit_code=0
           while ((retries > 0)); do
-            CGO_ENABLED=0 go test -p 1 -tags nobadger -v ./...
+            CGO_ENABLED=0 go test -p 1 -tags nobadger,nomysql,nopgx -v ./...
             exit_code=$?
             if ((exit_code == 0)); then
               break
@@ -206,7 +206,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: "~1.23"
+          go-version: "~1.24"
           check-latest: true
       - name: Install xcaddy
         run: |

.github/workflows/cross-build.yml

@@ -10,6 +10,10 @@ on:
       - master
       - 2.*
 
+env:
+  # https://github.com/actions/setup-go/issues/491
+  GOTOOLCHAIN: local
+
 jobs:
   build:
     strategy:
@@ -27,17 +31,13 @@ jobs:
           - 'darwin'
           - 'netbsd'
         go:
-          - '1.22'
+          - '1.24'
-          - '1.23'
 
         include:
         # Set the minimum Go patch version for the given Go minor
         # Usable via ${{ matrix.GO_SEMVER }}
-        - go: '1.22'
+        - go: '1.24'
-          GO_SEMVER: '~1.22.3'
+          GO_SEMVER: '~1.24.1'
-
-        - go: '1.23'
-          GO_SEMVER: '~1.23.0'
 
     runs-on: ubuntu-latest
     continue-on-error: true

.github/workflows/lint.yml

@@ -13,6 +13,10 @@ on:
 permissions:
   contents: read
 
+env:
+  # https://github.com/actions/setup-go/issues/491
+  GOTOOLCHAIN: local
+
 jobs:
   # From https://github.com/golangci/golangci-lint-action
   golangci:
@@ -43,7 +47,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: '~1.23'
+          go-version: '~1.24'
           check-latest: true
 
       - name: golangci-lint
@@ -63,5 +67,5 @@ jobs:
       - name: govulncheck
         uses: golang/govulncheck-action@v1
         with:
-          go-version-input: '~1.23.0'
+          go-version-input: '~1.24.1'
           check-latest: true

.github/workflows/release.yml

@@ -5,6 +5,10 @@ on:
     tags:
       - 'v*.*.*'
 
+env:
+  # https://github.com/actions/setup-go/issues/491
+  GOTOOLCHAIN: local
+
 jobs:
   release:
     name: Release
@@ -13,13 +17,13 @@ jobs:
         os: 
           - ubuntu-latest
         go: 
-          - '1.23'
+          - '1.24'
 
         include:
         # Set the minimum Go patch version for the given Go minor
         # Usable via ${{ matrix.GO_SEMVER }}
-        - go: '1.23'
+        - go: '1.24'
-          GO_SEMVER: '~1.23.0'
+          GO_SEMVER: '~1.24.1'
 
     runs-on: ${{ matrix.os }}
     # https://github.com/sigstore/cosign/issues/1258#issuecomment-1002251233

.goreleaser.yml

@@ -111,7 +111,7 @@ archives:
   - id: default
     format_overrides:
       - goos: windows
-        format: zip
+        formats: zip
     name_template: >-
       {{ .ProjectName }}_
       {{- .Version }}_

README.md

@@ -16,7 +16,7 @@
 	<a href="https://github.com/caddyserver/caddy/actions/workflows/ci.yml"><img src="https://github.com/caddyserver/caddy/actions/workflows/ci.yml/badge.svg"></a>
 	<a href="https://pkg.go.dev/github.com/caddyserver/caddy/v2"><img src="https://img.shields.io/badge/godoc-reference-%23007d9c.svg"></a>
 	<br>
-	<a href="https://twitter.com/caddyserver" title="@caddyserver on Twitter"><img src="https://img.shields.io/badge/twitter-@caddyserver-55acee.svg" alt="@caddyserver on Twitter"></a>
+	<a href="https://x.com/caddyserver" title="@caddyserver on Twitter"><img src="https://img.shields.io/twitter/follow/caddyserver" alt="@caddyserver on Twitter"></a>
 	<a href="https://caddy.community" title="Caddy Forum"><img src="https://img.shields.io/badge/community-forum-ff69b4.svg" alt="Caddy Forum"></a>
 	<br>
 	<a href="https://sourcegraph.com/github.com/caddyserver/caddy?badge" title="Caddy on Sourcegraph"><img src="https://sourcegraph.com/github.com/caddyserver/caddy/-/badge.svg" alt="Caddy on Sourcegraph"></a>
@@ -67,6 +67,7 @@
 	- Fully-managed local CA for internal names & IPs
 	- Can coordinate with other Caddy instances in a cluster
 	- Multi-issuer fallback
+	- Encrypted ClientHello (ECH) support
 - **Stays up when other servers go down** due to TLS/OCSP/certificate-related issues
 - **Production-ready** after serving trillions of requests and managing millions of TLS certificates
 - **Scales to hundreds of thousands of sites** as proven in production
@@ -87,7 +88,7 @@ See [our online documentation](https://caddyserver.com/docs/install) for other i
 
 Requirements:
 
-- [Go 1.22.3 or newer](https://golang.org/dl/)
+- [Go 1.24.0 or newer](https://golang.org/dl/)
 
 ### For development
 
@@ -176,7 +177,7 @@ The docs are also open source. You can contribute to them here: https://github.c
 
 ## Getting help
 
-- We advise companies using Caddy to secure a support contract through [Ardan Labs](https://www.ardanlabs.com/my/contact-us?dd=caddy) before help is needed.
+- We advise companies using Caddy to secure a support contract through [Ardan Labs](https://www.ardanlabs.com) before help is needed.
 
 - A [sponsorship](https://github.com/sponsors/mholt) goes a long way! We can offer private help to sponsors. If Caddy is benefitting your company, please consider a sponsorship. This not only helps fund full-time work to ensure the longevity of the project, it provides your company the resources, support, and discounts you need; along with being a great look for your company to your customers and potential customers!
 
@@ -192,8 +193,8 @@ Matthew Holt began developing Caddy in 2014 while studying computer science at B
 
 **The name "Caddy" is trademarked.** The name of the software is "Caddy", not "Caddy Server" or "CaddyServer". Please call it "Caddy" or, if you wish to clarify, "the Caddy web server". Caddy is a registered trademark of Stack Holdings GmbH.
 
-- _Project on Twitter: [@caddyserver](https://twitter.com/caddyserver)_
+- _Project on X: [@caddyserver](https://x.com/caddyserver)_
-- _Author on Twitter: [@mholt6](https://twitter.com/mholt6)_
+- _Author on X: [@mholt6](https://x.com/mholt6)_
 
 Caddy is a project of [ZeroSSL](https://zerossl.com), a Stack Holdings company.
 

admin.go

@@ -221,7 +221,8 @@ func (admin *AdminConfig) newAdminHandler(addr NetworkAddress, remote bool, _ Co
 	if remote {
 		muxWrap.remoteControl = admin.Remote
 	} else {
-		muxWrap.enforceHost = !addr.isWildcardInterface()
+		// see comment in allowedOrigins() as to why we disable the host check for unix/fd networks
+		muxWrap.enforceHost = !addr.isWildcardInterface() && !addr.IsUnixNetwork() && !addr.IsFdNetwork()
 		muxWrap.allowedOrigins = admin.allowedOrigins(addr)
 		muxWrap.enforceOrigin = admin.EnforceOrigin
 	}
@@ -310,47 +311,43 @@ func (admin AdminConfig) allowedOrigins(addr NetworkAddress) []*url.URL {
 	for _, o := range admin.Origins {
 		uniqueOrigins[o] = struct{}{}
 	}
-	if admin.Origins == nil {
+	// RFC 2616, Section 14.26:
+	// "A client MUST include a Host header field in all HTTP/1.1 request
+	// messages. If the requested URI does not include an Internet host
+	// name for the service being requested, then the Host header field MUST
+	// be given with an empty value."
+	//
+	// UPDATE July 2023: Go broke this by patching a minor security bug in 1.20.6.
+	// Understandable, but frustrating. See:
+	// https://github.com/golang/go/issues/60374
+	// See also the discussion here:
+	// https://github.com/golang/go/issues/61431
+	//
+	// We can no longer conform to RFC 2616 Section 14.26 from either Go or curl
+	// in purity. (Curl allowed no host between 7.40 and 7.50, but now requires a
+	// bogus host; see https://superuser.com/a/925610.) If we disable Host/Origin
+	// security checks, the infosec community assures me that it is secure to do
+	// so, because:
+	//
+	// 1) Browsers do not allow access to unix sockets
+	// 2) DNS is irrelevant to unix sockets
+	//
+	// If either of those two statements ever fail to hold true, it is not the
+	// fault of Caddy.
+	//
+	// Thus, we do not fill out allowed origins and do not enforce Host
+	// requirements for unix sockets. Enforcing it leads to confusion and
+	// frustration, when UDS have their own permissions from the OS.
+	// Enforcing host requirements here is effectively security theater,
+	// and a false sense of security.
+	//
+	// See also the discussion in #6832.
+	if admin.Origins == nil && !addr.IsUnixNetwork() && !addr.IsFdNetwork() {
 		if addr.isLoopback() {
-			if addr.IsUnixNetwork() || addr.IsFdNetwork() {
+			uniqueOrigins[net.JoinHostPort("localhost", addr.port())] = struct{}{}
-				// RFC 2616, Section 14.26:
+			uniqueOrigins[net.JoinHostPort("::1", addr.port())] = struct{}{}
-				// "A client MUST include a Host header field in all HTTP/1.1 request
+			uniqueOrigins[net.JoinHostPort("127.0.0.1", addr.port())] = struct{}{}
-				// messages. If the requested URI does not include an Internet host
+		} else {
-				// name for the service being requested, then the Host header field MUST
-				// be given with an empty value."
-				//
-				// UPDATE July 2023: Go broke this by patching a minor security bug in 1.20.6.
-				// Understandable, but frustrating. See:
-				// https://github.com/golang/go/issues/60374
-				// See also the discussion here:
-				// https://github.com/golang/go/issues/61431
-				//
-				// We can no longer conform to RFC 2616 Section 14.26 from either Go or curl
-				// in purity. (Curl allowed no host between 7.40 and 7.50, but now requires a
-				// bogus host; see https://superuser.com/a/925610.) If we disable Host/Origin
-				// security checks, the infosec community assures me that it is secure to do
-				// so, because:
-				// 1) Browsers do not allow access to unix sockets
-				// 2) DNS is irrelevant to unix sockets
-				//
-				// I am not quite ready to trust either of those external factors, so instead
-				// of disabling Host/Origin checks, we now allow specific Host values when
-				// accessing the admin endpoint over unix sockets. I definitely don't trust
-				// DNS (e.g. I don't trust 'localhost' to always resolve to the local host),
-				// and IP shouldn't even be used, but if it is for some reason, I think we can
-				// at least be reasonably assured that 127.0.0.1 and ::1 route to the local
-				// machine, meaning that a hypothetical browser origin would have to be on the
-				// local machine as well.
-				uniqueOrigins[""] = struct{}{}
-				uniqueOrigins["127.0.0.1"] = struct{}{}
-				uniqueOrigins["::1"] = struct{}{}
-			} else {
-				uniqueOrigins[net.JoinHostPort("localhost", addr.port())] = struct{}{}
-				uniqueOrigins[net.JoinHostPort("::1", addr.port())] = struct{}{}
-				uniqueOrigins[net.JoinHostPort("127.0.0.1", addr.port())] = struct{}{}
-			}
-		}
-		if !addr.IsUnixNetwork() && !addr.IsFdNetwork() {
 			uniqueOrigins[addr.JoinHostPort(0)] = struct{}{}
 		}
 	}
@@ -427,6 +424,13 @@ func replaceLocalAdminServer(cfg *Config, ctx Context) error {
 
 	handler := cfg.Admin.newAdminHandler(addr, false, ctx)
 
+	// run the provisioners for loaded modules to make sure local
+	// state is properly re-initialized in the new admin server
+	err = cfg.Admin.provisionAdminRouters(ctx)
+	if err != nil {
+		return err
+	}
+
 	ln, err := addr.Listen(context.TODO(), 0, net.ListenConfig{})
 	if err != nil {
 		return err
@@ -548,6 +552,13 @@ func replaceRemoteAdminServer(ctx Context, cfg *Config) error {
 	// because we are using TLS authentication instead
 	handler := cfg.Admin.newAdminHandler(addr, true, ctx)
 
+	// run the provisioners for loaded modules to make sure local
+	// state is properly re-initialized in the new admin server
+	err = cfg.Admin.provisionAdminRouters(ctx)
+	if err != nil {
+		return err
+	}
+
 	// create client certificate pool for TLS mutual auth, and extract public keys
 	// so that we can enforce access controls at the application layer
 	clientCertPool := x509.NewCertPool()
@@ -1139,7 +1150,7 @@ traverseLoop:
 						return fmt.Errorf("[%s] invalid array index '%s': %v",
 							path, idxStr, err)
 					}
-					if idx < 0 || idx >= len(arr) {
+					if idx < 0 || (method != http.MethodPut && idx >= len(arr)) || idx > len(arr) {
 						return fmt.Errorf("[%s] array index out of bounds: %s", path, idxStr)
 					}
 				}

admin_test.go

@@ -15,12 +15,20 @@
 package caddy
 
 import (
+	"context"
+	"crypto/x509"
 	"encoding/json"
 	"fmt"
+	"maps"
 	"net/http"
+	"net/http/httptest"
 	"reflect"
 	"sync"
 	"testing"
+
+	"github.com/caddyserver/certmagic"
+	"github.com/prometheus/client_golang/prometheus"
+	dto "github.com/prometheus/client_model/go"
 )
 
 var testCfg = []byte(`{
@@ -203,3 +211,719 @@ func BenchmarkLoad(b *testing.B) {
 		Load(testCfg, true)
 	}
 }
+
+func TestAdminHandlerErrorHandling(t *testing.T) {
+	initAdminMetrics()
+
+	handler := adminHandler{
+		mux: http.NewServeMux(),
+	}
+
+	handler.mux.Handle("/error", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		err := fmt.Errorf("test error")
+		handler.handleError(w, r, err)
+	}))
+
+	req := httptest.NewRequest(http.MethodGet, "/error", nil)
+	rr := httptest.NewRecorder()
+
+	handler.ServeHTTP(rr, req)
+
+	if rr.Code == http.StatusOK {
+		t.Error("expected error response, got success")
+	}
+
+	var apiErr APIError
+	if err := json.NewDecoder(rr.Body).Decode(&apiErr); err != nil {
+		t.Fatalf("decoding response: %v", err)
+	}
+	if apiErr.Message != "test error" {
+		t.Errorf("expected error message 'test error', got '%s'", apiErr.Message)
+	}
+}
+
+func initAdminMetrics() {
+	if adminMetrics.requestErrors != nil {
+		prometheus.Unregister(adminMetrics.requestErrors)
+	}
+	if adminMetrics.requestCount != nil {
+		prometheus.Unregister(adminMetrics.requestCount)
+	}
+
+	adminMetrics.requestErrors = prometheus.NewCounterVec(prometheus.CounterOpts{
+		Namespace: "caddy",
+		Subsystem: "admin_http",
+		Name:      "request_errors_total",
+		Help:      "Number of errors that occurred handling admin endpoint requests",
+	}, []string{"handler", "path", "method"})
+
+	adminMetrics.requestCount = prometheus.NewCounterVec(prometheus.CounterOpts{
+		Namespace: "caddy",
+		Subsystem: "admin_http",
+		Name:      "requests_total",
+		Help:      "Count of requests to the admin endpoint",
+	}, []string{"handler", "path", "code", "method"}) // Added code and method labels
+
+	prometheus.MustRegister(adminMetrics.requestErrors)
+	prometheus.MustRegister(adminMetrics.requestCount)
+}
+
+func TestAdminHandlerBuiltinRouteErrors(t *testing.T) {
+	initAdminMetrics()
+
+	cfg := &Config{
+		Admin: &AdminConfig{
+			Listen: "localhost:2019",
+		},
+	}
+
+	err := replaceLocalAdminServer(cfg, Context{})
+	if err != nil {
+		t.Fatalf("setting up admin server: %v", err)
+	}
+	defer func() {
+		stopAdminServer(localAdminServer)
+	}()
+
+	tests := []struct {
+		name           string
+		path           string
+		method         string
+		expectedStatus int
+	}{
+		{
+			name:           "stop endpoint wrong method",
+			path:           "/stop",
+			method:         http.MethodGet,
+			expectedStatus: http.StatusMethodNotAllowed,
+		},
+		{
+			name:           "config endpoint wrong content-type",
+			path:           "/config/",
+			method:         http.MethodPost,
+			expectedStatus: http.StatusBadRequest,
+		},
+		{
+			name:           "config ID missing ID",
+			path:           "/id/",
+			method:         http.MethodGet,
+			expectedStatus: http.StatusBadRequest,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			req := httptest.NewRequest(test.method, fmt.Sprintf("http://localhost:2019%s", test.path), nil)
+			rr := httptest.NewRecorder()
+
+			localAdminServer.Handler.ServeHTTP(rr, req)
+
+			if rr.Code != test.expectedStatus {
+				t.Errorf("expected status %d but got %d", test.expectedStatus, rr.Code)
+			}
+
+			metricValue := testGetMetricValue(map[string]string{
+				"path":    test.path,
+				"handler": "admin",
+				"method":  test.method,
+			})
+			if metricValue != 1 {
+				t.Errorf("expected error metric to be incremented once, got %v", metricValue)
+			}
+		})
+	}
+}
+
+func testGetMetricValue(labels map[string]string) float64 {
+	promLabels := prometheus.Labels{}
+	maps.Copy(promLabels, labels)
+
+	metric, err := adminMetrics.requestErrors.GetMetricWith(promLabels)
+	if err != nil {
+		return 0
+	}
+
+	pb := &dto.Metric{}
+	metric.Write(pb)
+	return pb.GetCounter().GetValue()
+}
+
+type mockRouter struct {
+	routes []AdminRoute
+}
+
+func (m mockRouter) Routes() []AdminRoute {
+	return m.routes
+}
+
+type mockModule struct {
+	mockRouter
+}
+
+func (m *mockModule) CaddyModule() ModuleInfo {
+	return ModuleInfo{
+		ID: "admin.api.mock",
+		New: func() Module {
+			mm := &mockModule{
+				mockRouter: mockRouter{
+					routes: m.routes,
+				},
+			}
+			return mm
+		},
+	}
+}
+
+func TestNewAdminHandlerRouterRegistration(t *testing.T) {
+	originalModules := make(map[string]ModuleInfo)
+	maps.Copy(originalModules, modules)
+	defer func() {
+		modules = originalModules
+	}()
+
+	mockRoute := AdminRoute{
+		Pattern: "/mock",
+		Handler: AdminHandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
+			w.WriteHeader(http.StatusOK)
+			return nil
+		}),
+	}
+
+	mock := &mockModule{
+		mockRouter: mockRouter{
+			routes: []AdminRoute{mockRoute},
+		},
+	}
+	RegisterModule(mock)
+
+	addr, err := ParseNetworkAddress("localhost:2019")
+	if err != nil {
+		t.Fatalf("Failed to parse address: %v", err)
+	}
+
+	admin := &AdminConfig{
+		EnforceOrigin: false,
+	}
+	handler := admin.newAdminHandler(addr, false, Context{})
+
+	req := httptest.NewRequest("GET", "/mock", nil)
+	req.Host = "localhost:2019"
+	rr := httptest.NewRecorder()
+
+	handler.ServeHTTP(rr, req)
+
+	if rr.Code != http.StatusOK {
+		t.Errorf("Expected status code %d but got %d", http.StatusOK, rr.Code)
+		t.Logf("Response body: %s", rr.Body.String())
+	}
+
+	if len(admin.routers) != 1 {
+		t.Errorf("Expected 1 router to be stored, got %d", len(admin.routers))
+	}
+}
+
+type mockProvisionableRouter struct {
+	mockRouter
+	provisionErr error
+	provisioned  bool
+}
+
+func (m *mockProvisionableRouter) Provision(Context) error {
+	m.provisioned = true
+	return m.provisionErr
+}
+
+type mockProvisionableModule struct {
+	*mockProvisionableRouter
+}
+
+func (m *mockProvisionableModule) CaddyModule() ModuleInfo {
+	return ModuleInfo{
+		ID: "admin.api.mock_provision",
+		New: func() Module {
+			mm := &mockProvisionableModule{
+				mockProvisionableRouter: &mockProvisionableRouter{
+					mockRouter:   m.mockRouter,
+					provisionErr: m.provisionErr,
+				},
+			}
+			return mm
+		},
+	}
+}
+
+func TestAdminRouterProvisioning(t *testing.T) {
+	tests := []struct {
+		name         string
+		provisionErr error
+		wantErr      bool
+		routersAfter int // expected number of routers after provisioning
+	}{
+		{
+			name:         "successful provisioning",
+			provisionErr: nil,
+			wantErr:      false,
+			routersAfter: 0,
+		},
+		{
+			name:         "provisioning error",
+			provisionErr: fmt.Errorf("provision failed"),
+			wantErr:      true,
+			routersAfter: 1,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			originalModules := make(map[string]ModuleInfo)
+			maps.Copy(originalModules, modules)
+			defer func() {
+				modules = originalModules
+			}()
+
+			mockRoute := AdminRoute{
+				Pattern: "/mock",
+				Handler: AdminHandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
+					return nil
+				}),
+			}
+
+			// Create provisionable module
+			mock := &mockProvisionableModule{
+				mockProvisionableRouter: &mockProvisionableRouter{
+					mockRouter: mockRouter{
+						routes: []AdminRoute{mockRoute},
+					},
+					provisionErr: test.provisionErr,
+				},
+			}
+			RegisterModule(mock)
+
+			admin := &AdminConfig{}
+			addr, err := ParseNetworkAddress("localhost:2019")
+			if err != nil {
+				t.Fatalf("Failed to parse address: %v", err)
+			}
+
+			_ = admin.newAdminHandler(addr, false, Context{})
+			err = admin.provisionAdminRouters(Context{})
+
+			if test.wantErr {
+				if err == nil {
+					t.Error("Expected error but got nil")
+				}
+			} else {
+				if err != nil {
+					t.Errorf("Expected no error but got: %v", err)
+				}
+			}
+
+			if len(admin.routers) != test.routersAfter {
+				t.Errorf("Expected %d routers after provisioning, got %d", test.routersAfter, len(admin.routers))
+			}
+		})
+	}
+}
+
+func TestAllowedOriginsUnixSocket(t *testing.T) {
+	// see comment in allowedOrigins() as to why we do not fill out allowed origins for UDS
+	tests := []struct {
+		name          string
+		addr          NetworkAddress
+		origins       []string
+		expectOrigins []string
+	}{
+		{
+			name: "unix socket with default origins",
+			addr: NetworkAddress{
+				Network: "unix",
+				Host:    "/tmp/caddy.sock",
+			},
+			origins:       nil, // default origins
+			expectOrigins: []string{},
+		},
+		{
+			name: "unix socket with custom origins",
+			addr: NetworkAddress{
+				Network: "unix",
+				Host:    "/tmp/caddy.sock",
+			},
+			origins: []string{"example.com"},
+			expectOrigins: []string{
+				"example.com",
+			},
+		},
+		{
+			name: "tcp socket on localhost gets all loopback addresses",
+			addr: NetworkAddress{
+				Network:   "tcp",
+				Host:      "localhost",
+				StartPort: 2019,
+				EndPort:   2019,
+			},
+			origins: nil,
+			expectOrigins: []string{
+				"localhost:2019",
+				"[::1]:2019",
+				"127.0.0.1:2019",
+			},
+		},
+	}
+
+	for i, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			admin := AdminConfig{
+				Origins: test.origins,
+			}
+
+			got := admin.allowedOrigins(test.addr)
+
+			var gotOrigins []string
+			for _, u := range got {
+				gotOrigins = append(gotOrigins, u.Host)
+			}
+
+			if len(gotOrigins) != len(test.expectOrigins) {
+				t.Errorf("%d: Expected %d origins but got %d", i, len(test.expectOrigins), len(gotOrigins))
+				return
+			}
+
+			expectMap := make(map[string]struct{})
+			for _, origin := range test.expectOrigins {
+				expectMap[origin] = struct{}{}
+			}
+
+			gotMap := make(map[string]struct{})
+			for _, origin := range gotOrigins {
+				gotMap[origin] = struct{}{}
+			}
+
+			if !reflect.DeepEqual(expectMap, gotMap) {
+				t.Errorf("%d: Origins mismatch.\nExpected: %v\nGot: %v", i, test.expectOrigins, gotOrigins)
+			}
+		})
+	}
+}
+
+func TestReplaceRemoteAdminServer(t *testing.T) {
+	const testCert = `MIIDCTCCAfGgAwIBAgIUXsqJ1mY8pKlHQtI3HJ23x2eZPqwwDQYJKoZIhvcNAQEL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`
+
+	tests := []struct {
+		name    string
+		cfg     *Config
+		wantErr bool
+	}{
+		{
+			name:    "nil config",
+			cfg:     nil,
+			wantErr: false,
+		},
+		{
+			name: "nil admin config",
+			cfg: &Config{
+				Admin: nil,
+			},
+			wantErr: false,
+		},
+		{
+			name: "nil remote config",
+			cfg: &Config{
+				Admin: &AdminConfig{},
+			},
+			wantErr: false,
+		},
+		{
+			name: "invalid listen address",
+			cfg: &Config{
+				Admin: &AdminConfig{
+					Remote: &RemoteAdmin{
+						Listen: "invalid:address",
+					},
+				},
+			},
+			wantErr: true,
+		},
+		{
+			name: "valid config",
+			cfg: &Config{
+				Admin: &AdminConfig{
+					Identity: &IdentityConfig{},
+					Remote: &RemoteAdmin{
+						Listen: "localhost:2021",
+						AccessControl: []*AdminAccess{
+							{
+								PublicKeys:  []string{testCert},
+								Permissions: []AdminPermissions{{Methods: []string{"GET"}, Paths: []string{"/test"}}},
+							},
+						},
+					},
+				},
+			},
+			wantErr: false,
+		},
+		{
+			name: "invalid certificate",
+			cfg: &Config{
+				Admin: &AdminConfig{
+					Identity: &IdentityConfig{},
+					Remote: &RemoteAdmin{
+						Listen: "localhost:2021",
+						AccessControl: []*AdminAccess{
+							{
+								PublicKeys:  []string{"invalid-cert-data"},
+								Permissions: []AdminPermissions{{Methods: []string{"GET"}, Paths: []string{"/test"}}},
+							},
+						},
+					},
+				},
+			},
+			wantErr: true,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			ctx := Context{
+				Context: context.Background(),
+				cfg:     test.cfg,
+			}
+
+			if test.cfg != nil {
+				test.cfg.storage = &certmagic.FileStorage{Path: t.TempDir()}
+			}
+
+			if test.cfg != nil && test.cfg.Admin != nil && test.cfg.Admin.Identity != nil {
+				identityCertCache = certmagic.NewCache(certmagic.CacheOptions{
+					GetConfigForCert: func(certmagic.Certificate) (*certmagic.Config, error) {
+						return &certmagic.Config{}, nil
+					},
+				})
+			}
+
+			err := replaceRemoteAdminServer(ctx, test.cfg)
+
+			if test.wantErr {
+				if err == nil {
+					t.Error("Expected error but got nil")
+				}
+			} else {
+				if err != nil {
+					t.Errorf("Expected no error but got: %v", err)
+				}
+			}
+
+			// Clean up
+			if remoteAdminServer != nil {
+				_ = stopAdminServer(remoteAdminServer)
+			}
+		})
+	}
+}
+
+type mockIssuer struct {
+	configSet *certmagic.Config
+}
+
+func (m *mockIssuer) Issue(ctx context.Context, csr *x509.CertificateRequest) (*certmagic.IssuedCertificate, error) {
+	return &certmagic.IssuedCertificate{
+		Certificate: []byte(csr.Raw),
+	}, nil
+}
+
+func (m *mockIssuer) SetConfig(cfg *certmagic.Config) {
+	m.configSet = cfg
+}
+
+func (m *mockIssuer) IssuerKey() string {
+	return "mock"
+}
+
+type mockIssuerModule struct {
+	*mockIssuer
+}
+
+func (m *mockIssuerModule) CaddyModule() ModuleInfo {
+	return ModuleInfo{
+		ID: "tls.issuance.acme",
+		New: func() Module {
+			return &mockIssuerModule{mockIssuer: new(mockIssuer)}
+		},
+	}
+}
+
+func TestManageIdentity(t *testing.T) {
+	originalModules := make(map[string]ModuleInfo)
+	maps.Copy(originalModules, modules)
+	defer func() {
+		modules = originalModules
+	}()
+
+	RegisterModule(&mockIssuerModule{})
+
+	certPEM := []byte(`-----BEGIN CERTIFICATE-----
+MIIDujCCAqKgAwIBAgIIE31FZVaPXTUwDQYJKoZIhvcNAQEFBQAwSTELMAkGA1UE
+BhMCVVMxEzARBgNVBAoTCkdvb2dsZSBJbmMxJTAjBgNVBAMTHEdvb2dsZSBJbnRl
+cm5ldCBBdXRob3JpdHkgRzIwHhcNMTQwMTI5MTMyNzQzWhcNMTQwNTI5MDAwMDAw
+WjBpMQswCQYDVQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwN
+TW91bnRhaW4gVmlldzETMBEGA1UECgwKR29vZ2xlIEluYzEYMBYGA1UEAwwPbWFp
+bC5nb29nbGUuY29tMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE3lcub2pUwkjC
+5GJQA2ZZfJJi6d1QHhEmkX9VxKYGp6gagZuRqJWy9TXP6++1ZzQQxqZLD0TkuxZ9
+8i9Nz00000CCBjCCAQQwHQYDVR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMGgG
+CCsGAQUFBwEBBFwwWjArBggrBgEFBQcwAoYfaHR0cDovL3BraS5nb29nbGUuY29t
+L0dJQUcyLmNydDArBggrBgEFBQcwAYYfaHR0cDovL2NsaWVudHMxLmdvb2dsZS5j
+b20vb2NzcDAdBgNVHQ4EFgQUiJxtimAuTfwb+aUtBn5UYKreKvMwDAYDVR0TAQH/
+BAIwADAfBgNVHSMEGDAWgBRK3QYWG7z2aLV29YG2u2IaulqBLzAXBgNVHREEEDAO
+ggxtYWlsLmdvb2dsZTANBgkqhkiG9w0BAQUFAAOCAQEAMP6IWgNGZE8wP9TjFjSZ
+3mmW3A1eIr0CuPwNZ2LJ5ZD1i70ojzcj4I9IdP5yPg9CAEV4hNASbM1LzfC7GmJE
+tPzW5tRmpKVWZGRgTgZI8Hp/xZXMwLh9ZmXV4kESFAGj5G5FNvJyUV7R5Eh+7OZX
+7G4jJ4ZGJh+5jzN9HdJJHQHGYNIYOzC7+HH9UMwCjX9vhQ4RjwFZJThS2Yb+y7pb
+9yxTJZoXC6J0H5JpnZb7kZEJ+Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+-----END CERTIFICATE-----`)
+
+	keyPEM := []byte(`-----BEGIN PRIVATE KEY-----
+MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDRS0LmTwUT0iwP
+...
+-----END PRIVATE KEY-----`)
+
+	testStorage := certmagic.FileStorage{Path: t.TempDir()}
+	err := testStorage.Store(context.Background(), "localhost/localhost.crt", certPEM)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = testStorage.Store(context.Background(), "localhost/localhost.key", keyPEM)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	tests := []struct {
+		name       string
+		cfg        *Config
+		wantErr    bool
+		checkState func(*testing.T, *Config)
+	}{
+		{
+			name: "nil config",
+			cfg:  nil,
+		},
+		{
+			name: "nil admin config",
+			cfg: &Config{
+				Admin: nil,
+			},
+		},
+		{
+			name: "nil identity config",
+			cfg: &Config{
+				Admin: &AdminConfig{},
+			},
+		},
+		{
+			name: "default issuer when none specified",
+			cfg: &Config{
+				Admin: &AdminConfig{
+					Identity: &IdentityConfig{
+						Identifiers: []string{"localhost"},
+					},
+				},
+				storage: &testStorage,
+			},
+			checkState: func(t *testing.T, cfg *Config) {
+				if len(cfg.Admin.Identity.issuers) == 0 {
+					t.Error("Expected at least 1 issuer to be configured")
+					return
+				}
+				if _, ok := cfg.Admin.Identity.issuers[0].(*mockIssuerModule); !ok {
+					t.Error("Expected mock issuer to be configured")
+				}
+			},
+		},
+		{
+			name: "custom issuer",
+			cfg: &Config{
+				Admin: &AdminConfig{
+					Identity: &IdentityConfig{
+						Identifiers: []string{"localhost"},
+						IssuersRaw: []json.RawMessage{
+							json.RawMessage(`{"module": "acme"}`),
+						},
+					},
+				},
+				storage: &certmagic.FileStorage{Path: "testdata"},
+			},
+			checkState: func(t *testing.T, cfg *Config) {
+				if len(cfg.Admin.Identity.issuers) != 1 {
+					t.Fatalf("Expected 1 issuer, got %d", len(cfg.Admin.Identity.issuers))
+				}
+				mockIss, ok := cfg.Admin.Identity.issuers[0].(*mockIssuerModule)
+				if !ok {
+					t.Fatal("Expected mock issuer")
+				}
+				if mockIss.configSet == nil {
+					t.Error("Issuer config was not set")
+				}
+			},
+		},
+		{
+			name: "invalid issuer module",
+			cfg: &Config{
+				Admin: &AdminConfig{
+					Identity: &IdentityConfig{
+						Identifiers: []string{"localhost"},
+						IssuersRaw: []json.RawMessage{
+							json.RawMessage(`{"module": "doesnt_exist"}`),
+						},
+					},
+				},
+			},
+			wantErr: true,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if identityCertCache != nil {
+				// Reset the cert cache before each test
+				identityCertCache.Stop()
+				identityCertCache = nil
+			}
+
+			ctx := Context{
+				Context:         context.Background(),
+				cfg:             test.cfg,
+				moduleInstances: make(map[string][]Module),
+			}
+
+			err := manageIdentity(ctx, test.cfg)
+
+			if test.wantErr {
+				if err == nil {
+					t.Error("Expected error but got nil")
+				}
+				return
+			}
+			if err != nil {
+				t.Fatalf("Expected no error but got: %v", err)
+			}
+
+			if test.checkState != nil {
+				test.checkState(t, test.cfg)
+			}
+		})
+	}
+}

caddy.go

@@ -81,13 +81,14 @@ type Config struct {
 	// associated value.
 	AppsRaw ModuleMap `json:"apps,omitempty" caddy:"namespace="`
 
-	apps    map[string]App
+	apps         map[string]App
-	storage certmagic.Storage
+	storage      certmagic.Storage
+	eventEmitter eventEmitter
 
 	cancelFunc context.CancelFunc
 
-	// filesystems is a dict of filesystems that will later be loaded from and added to.
+	// fileSystems is a dict of fileSystems that will later be loaded from and added to.
-	filesystems FileSystems
+	fileSystems FileSystems
 }
 
 // App is a thing that Caddy runs.
@@ -442,6 +443,10 @@ func run(newCfg *Config, start bool) (Context, error) {
 	}
 	globalMetrics.configSuccess.Set(1)
 	globalMetrics.configSuccessTime.SetToCurrentTime()
+
+	// TODO: This event is experimental and subject to change.
+	ctx.emitEvent("started", nil)
+
 	// now that the user's config is running, finish setting up anything else,
 	// such as remote admin endpoint, config loader, etc.
 	return ctx, finishSettingUp(ctx, ctx.cfg)
@@ -500,16 +505,8 @@ func provisionContext(newCfg *Config, replaceAdminServer bool) (Context, error)
 		return ctx, err
 	}
 
-	// start the admin endpoint (and stop any prior one)
-	if replaceAdminServer {
-		err = replaceLocalAdminServer(newCfg, ctx)
-		if err != nil {
-			return ctx, fmt.Errorf("starting caddy administration endpoint: %v", err)
-		}
-	}
-
 	// create the new filesystem map
-	newCfg.filesystems = &filesystems.FilesystemMap{}
+	newCfg.fileSystems = &filesystems.FileSystemMap{}
 
 	// prepare the new config for use
 	newCfg.apps = make(map[string]App)
@@ -539,6 +536,14 @@ func provisionContext(newCfg *Config, replaceAdminServer bool) (Context, error)
 		return ctx, err
 	}
 
+	// start the admin endpoint (and stop any prior one)
+	if replaceAdminServer {
+		err = replaceLocalAdminServer(newCfg, ctx)
+		if err != nil {
+			return ctx, fmt.Errorf("starting caddy administration endpoint: %v", err)
+		}
+	}
+
 	// Load and Provision each app and their submodules
 	err = func() error {
 		for appName := range newCfg.AppsRaw {
@@ -696,6 +701,9 @@ func unsyncedStop(ctx Context) {
 		return
 	}
 
+	// TODO: This event is experimental and subject to change.
+	ctx.emitEvent("stopping", nil)
+
 	// stop each app
 	for name, a := range ctx.cfg.apps {
 		err := a.Stop()
@@ -1038,6 +1046,92 @@ func Version() (simple, full string) {
 	return
 }
 
+// Event represents something that has happened or is happening.
+// An Event value is not synchronized, so it should be copied if
+// being used in goroutines.
+//
+// EXPERIMENTAL: Events are subject to change.
+type Event struct {
+	// If non-nil, the event has been aborted, meaning
+	// propagation has stopped to other handlers and
+	// the code should stop what it was doing. Emitters
+	// may choose to use this as a signal to adjust their
+	// code path appropriately.
+	Aborted error
+
+	// The data associated with the event. Usually the
+	// original emitter will be the only one to set or
+	// change these values, but the field is exported
+	// so handlers can have full access if needed.
+	// However, this map is not synchronized, so
+	// handlers must not use this map directly in new
+	// goroutines; instead, copy the map to use it in a
+	// goroutine. Data may be nil.
+	Data map[string]any
+
+	id     uuid.UUID
+	ts     time.Time
+	name   string
+	origin Module
+}
+
+// NewEvent creates a new event, but does not emit the event. To emit an
+// event, call Emit() on the current instance of the caddyevents app insteaad.
+//
+// EXPERIMENTAL: Subject to change.
+func NewEvent(ctx Context, name string, data map[string]any) (Event, error) {
+	id, err := uuid.NewRandom()
+	if err != nil {
+		return Event{}, fmt.Errorf("generating new event ID: %v", err)
+	}
+	name = strings.ToLower(name)
+	return Event{
+		Data:   data,
+		id:     id,
+		ts:     time.Now(),
+		name:   name,
+		origin: ctx.Module(),
+	}, nil
+}
+
+func (e Event) ID() uuid.UUID        { return e.id }
+func (e Event) Timestamp() time.Time { return e.ts }
+func (e Event) Name() string         { return e.name }
+func (e Event) Origin() Module       { return e.origin } // Returns the module that originated the event. May be nil, usually if caddy core emits the event.
+
+// CloudEvent exports event e as a structure that, when
+// serialized as JSON, is compatible with the
+// CloudEvents spec.
+func (e Event) CloudEvent() CloudEvent {
+	dataJSON, _ := json.Marshal(e.Data)
+	return CloudEvent{
+		ID:              e.id.String(),
+		Source:          e.origin.CaddyModule().String(),
+		SpecVersion:     "1.0",
+		Type:            e.name,
+		Time:            e.ts,
+		DataContentType: "application/json",
+		Data:            dataJSON,
+	}
+}
+
+// CloudEvent is a JSON-serializable structure that
+// is compatible with the CloudEvents specification.
+// See https://cloudevents.io.
+// EXPERIMENTAL: Subject to change.
+type CloudEvent struct {
+	ID              string          `json:"id"`
+	Source          string          `json:"source"`
+	SpecVersion     string          `json:"specversion"`
+	Type            string          `json:"type"`
+	Time            time.Time       `json:"time"`
+	DataContentType string          `json:"datacontenttype,omitempty"`
+	Data            json.RawMessage `json:"data,omitempty"`
+}
+
+// ErrEventAborted cancels an event.
+var ErrEventAborted = errors.New("event aborted")
+
 // ActiveContext returns the currently-active context.
 // This function is experimental and might be changed
 // or removed in the future.

caddyconfig/caddyfile/formatter.go

@@ -61,7 +61,8 @@ func Format(input []byte) []byte {
 		heredocMarker        []rune
 		heredocClosingMarker []rune
 
-		nesting int // indentation level
+		nesting         int // indentation level
+		withinBackquote bool
 	)
 
 	write := func(ch rune) {
@@ -88,6 +89,9 @@ func Format(input []byte) []byte {
 			}
 			panic(err)
 		}
+		if ch == '`' {
+			withinBackquote = !withinBackquote
+		}
 
 		// detect whether we have the start of a heredoc
 		if !quoted && !(heredoc != heredocClosed || heredocEscaped) &&
@@ -236,14 +240,23 @@ func Format(input []byte) []byte {
 		switch {
 		case ch == '{':
 			openBrace = true
-			openBraceWritten = false
 			openBraceSpace = spacePrior && !beginningOfLine
 			if openBraceSpace {
 				write(' ')
 			}
+			openBraceWritten = false
+			if withinBackquote {
+				write('{')
+				openBraceWritten = true
+				continue
+			}
 			continue
 
 		case ch == '}' && (spacePrior || !openBrace):
+			if withinBackquote {
+				write('}')
+				continue
+			}
 			if last != '\n' {
 				nextLine()
 			}

caddyconfig/caddyfile/formatter_test.go

@@ -434,6 +434,16 @@ block2 {
 }
 `,
 		},
+		{
+			description: "Preserve braces wrapped by backquotes",
+			input:       "block {respond `All braces should remain: {{now | date \"2006\"}}`}",
+			expect:      "block {respond `All braces should remain: {{now | date \"2006\"}}`}",
+		},
+		{
+			description: "Preserve braces wrapped by quotes",
+			input:       "block {respond \"All braces should remain: {{now | date `2006`}}\"}",
+			expect:      "block {respond \"All braces should remain: {{now | date `2006`}}\"}",
+		},
 	} {
 		// the formatter should output a trailing newline,
 		// even if the tests aren't written to expect that

caddyconfig/httpcaddyfile/builtins.go

@@ -99,7 +99,7 @@ func parseBind(h Helper) ([]ConfigValue, error) {
 //	    ca                            <acme_ca_endpoint>
 //	    ca_root                       <pem_file>
 //	    key_type                      [ed25519|p256|p384|rsa2048|rsa4096]
-//	    dns                           <provider_name> [...]
+//	    dns                           [<provider_name> [...]]    (required, though, if DNS is not configured as global option)
 //	    propagation_delay             <duration>
 //	    propagation_timeout           <duration>
 //	    resolvers                     <dns_servers...>
@@ -312,10 +312,6 @@ func parseTLS(h Helper) ([]ConfigValue, error) {
 			certManagers = append(certManagers, certManager)
 
 		case "dns":
-			if !h.NextArg() {
-				return nil, h.ArgErr()
-			}
-			provName := h.Val()
 			if acmeIssuer == nil {
 				acmeIssuer = new(caddytls.ACMEIssuer)
 			}
@@ -325,12 +321,19 @@ func parseTLS(h Helper) ([]ConfigValue, error) {
 			if acmeIssuer.Challenges.DNS == nil {
 				acmeIssuer.Challenges.DNS = new(caddytls.DNSChallengeConfig)
 			}
-			modID := "dns.providers." + provName
+			// DNS provider configuration optional, since it may be configured globally via the TLS app with global options
-			unm, err := caddyfile.UnmarshalModule(h.Dispenser, modID)
+			if h.NextArg() {
-			if err != nil {
+				provName := h.Val()
-				return nil, err
+				modID := "dns.providers." + provName
+				unm, err := caddyfile.UnmarshalModule(h.Dispenser, modID)
+				if err != nil {
+					return nil, err
+				}
+				acmeIssuer.Challenges.DNS.ProviderRaw = caddyconfig.JSONModuleObject(unm, "name", provName, h.warnings)
+			} else if h.Option("dns") == nil {
+				// if DNS is omitted locally, it needs to be configured globally
+				return nil, h.ArgErr()
 			}
-			acmeIssuer.Challenges.DNS.ProviderRaw = caddyconfig.JSONModuleObject(unm, "name", provName, h.warnings)
 
 		case "resolvers":
 			args := h.RemainingArgs()

caddyconfig/httpcaddyfile/directives.go

@@ -16,6 +16,7 @@ package httpcaddyfile
 
 import (
 	"encoding/json"
+	"maps"
 	"net"
 	"slices"
 	"sort"
@@ -365,9 +366,7 @@ func parseSegmentAsConfig(h Helper) ([]ConfigValue, error) {
 		// copy existing matcher definitions so we can augment
 		// new ones that are defined only in this scope
 		matcherDefs := make(map[string]caddy.ModuleMap, len(h.matcherDefs))
-		for key, val := range h.matcherDefs {
+		maps.Copy(matcherDefs, h.matcherDefs)
-			matcherDefs[key] = val
-		}
 
 		// find and extract any embedded matcher definitions in this scope
 		for i := 0; i < len(segments); i++ {
@@ -483,12 +482,29 @@ func sortRoutes(routes []ConfigValue) {
 			// we can only confidently compare path lengths if both
 			// directives have a single path to match (issue #5037)
 			if iPathLen > 0 && jPathLen > 0 {
+				// trim the trailing wildcard if there is one
+				iPathTrimmed := strings.TrimSuffix(iPM[0], "*")
+				jPathTrimmed := strings.TrimSuffix(jPM[0], "*")
+
 				// if both paths are the same except for a trailing wildcard,
 				// sort by the shorter path first (which is more specific)
-				if strings.TrimSuffix(iPM[0], "*") == strings.TrimSuffix(jPM[0], "*") {
+				if iPathTrimmed == jPathTrimmed {
 					return iPathLen < jPathLen
 				}
 
+				// we use the trimmed length to compare the paths
+				// https://github.com/caddyserver/caddy/issues/7012#issuecomment-2870142195
+				// credit to https://github.com/Hellio404
+				// for sorts with many items, mixing matchers w/ and w/o wildcards will confuse the sort and result in incorrect orders
+				iPathLen = len(iPathTrimmed)
+				jPathLen = len(jPathTrimmed)
+
+				// if both paths have the same length, sort lexically
+				// https://github.com/caddyserver/caddy/pull/7015#issuecomment-2871993588
+				if iPathLen == jPathLen {
+					return iPathTrimmed < jPathTrimmed
+				}
+
 				// sort most-specific (longest) path first
 				return iPathLen > jPathLen
 			}

caddyconfig/httpcaddyfile/httptype.go

@@ -191,7 +191,7 @@ func (st ServerType) Setup(
 	metrics, _ := options["metrics"].(*caddyhttp.Metrics)
 	for _, s := range servers {
 		if s.Metrics != nil {
-			metrics = cmp.Or[*caddyhttp.Metrics](metrics, &caddyhttp.Metrics{})
+			metrics = cmp.Or(metrics, &caddyhttp.Metrics{})
 			metrics = &caddyhttp.Metrics{
 				PerHost: metrics.PerHost || s.Metrics.PerHost,
 			}
@@ -350,7 +350,7 @@ func (st ServerType) Setup(
 
 				// avoid duplicates by sorting + compacting
 				sort.Strings(defaultLog.Exclude)
-				defaultLog.Exclude = slices.Compact[[]string, string](defaultLog.Exclude)
+				defaultLog.Exclude = slices.Compact(defaultLog.Exclude)
 			}
 		}
 		// we may have not actually added anything, so remove if empty
@@ -633,12 +633,6 @@ func (st *ServerType) serversFromPairings(
 					srv.AutoHTTPS = new(caddyhttp.AutoHTTPSConfig)
 				}
 				srv.AutoHTTPS.IgnoreLoadedCerts = true
-
-			case "prefer_wildcard":
-				if srv.AutoHTTPS == nil {
-					srv.AutoHTTPS = new(caddyhttp.AutoHTTPSConfig)
-				}
-				srv.AutoHTTPS.PreferWildcard = true
 			}
 		}
 
@@ -706,16 +700,6 @@ func (st *ServerType) serversFromPairings(
 			return specificity(iLongestHost) > specificity(jLongestHost)
 		})
 
-		// collect all hosts that have a wildcard in them
-		wildcardHosts := []string{}
-		for _, sblock := range p.serverBlocks {
-			for _, addr := range sblock.parsedKeys {
-				if strings.HasPrefix(addr.Host, "*.") {
-					wildcardHosts = append(wildcardHosts, addr.Host[2:])
-				}
-			}
-		}
-
 		var hasCatchAllTLSConnPolicy, addressQualifiesForTLS bool
 		autoHTTPSWillAddConnPolicy := srv.AutoHTTPS == nil || !srv.AutoHTTPS.Disabled
 
@@ -801,7 +785,13 @@ func (st *ServerType) serversFromPairings(
 						cp.FallbackSNI = fallbackSNI
 					}
 
-					// only append this policy if it actually changes something
+					// only append this policy if it actually changes something,
+					// or if the configuration explicitly automates certs for
+					// these names (this is necessary to hoist a connection policy
+					// above one that may manually load a wildcard cert that would
+					// otherwise clobber the automated one; the code that appends
+					// policies that manually load certs comes later, so they're
+					// lower in the list)
 					if !cp.SettingsEmpty() || mapContains(forceAutomatedNames, hosts) {
 						srv.TLSConnPolicies = append(srv.TLSConnPolicies, cp)
 						hasCatchAllTLSConnPolicy = len(hosts) == 0
@@ -841,18 +831,6 @@ func (st *ServerType) serversFromPairings(
 					addressQualifiesForTLS = true
 				}
 
-				// If prefer wildcard is enabled, then we add hosts that are
-				// already covered by the wildcard to the skip list
-				if addressQualifiesForTLS && srv.AutoHTTPS != nil && srv.AutoHTTPS.PreferWildcard {
-					baseDomain := addr.Host
-					if idx := strings.Index(baseDomain, "."); idx != -1 {
-						baseDomain = baseDomain[idx+1:]
-					}
-					if !strings.HasPrefix(addr.Host, "*.") && slices.Contains(wildcardHosts, baseDomain) {
-						srv.AutoHTTPS.SkipCerts = append(srv.AutoHTTPS.SkipCerts, addr.Host)
-					}
-				}
-
 				// predict whether auto-HTTPS will add the conn policy for us; if so, we
 				// may not need to add one for this server
 				autoHTTPSWillAddConnPolicy = autoHTTPSWillAddConnPolicy &&
@@ -1083,11 +1061,40 @@ func consolidateConnPolicies(cps caddytls.ConnectionPolicies) (caddytls.Connecti
 
 			// if they're exactly equal in every way, just keep one of them
 			if reflect.DeepEqual(cps[i], cps[j]) {
-				cps = append(cps[:j], cps[j+1:]...)
+				cps = slices.Delete(cps, j, j+1)
 				i--
 				break
 			}
 
+			// as a special case, if there are adjacent TLS conn policies that are identical except
+			// by their matchers, and the matchers are specifically just ServerName ("sni") matchers
+			// (by far the most common), we can combine them into a single policy
+			if i == j-1 && len(cps[i].MatchersRaw) == 1 && len(cps[j].MatchersRaw) == 1 {
+				if iSNIMatcherJSON, ok := cps[i].MatchersRaw["sni"]; ok {
+					if jSNIMatcherJSON, ok := cps[j].MatchersRaw["sni"]; ok {
+						// position of policies and the matcher criteria check out; if settings are
+						// the same, then we can combine the policies; we have to unmarshal and
+						// remarshal the matchers though
+						if cps[i].SettingsEqual(*cps[j]) {
+							var iSNIMatcher caddytls.MatchServerName
+							if err := json.Unmarshal(iSNIMatcherJSON, &iSNIMatcher); err == nil {
+								var jSNIMatcher caddytls.MatchServerName
+								if err := json.Unmarshal(jSNIMatcherJSON, &jSNIMatcher); err == nil {
+									iSNIMatcher = append(iSNIMatcher, jSNIMatcher...)
+									cps[i].MatchersRaw["sni"], err = json.Marshal(iSNIMatcher)
+									if err != nil {
+										return nil, fmt.Errorf("recombining SNI matchers: %v", err)
+									}
+									cps = slices.Delete(cps, j, j+1)
+									i--
+									break
+								}
+							}
+						}
+					}
+				}
+			}
+
 			// if they have the same matcher, try to reconcile each field: either they must
 			// be identical, or we have to be able to combine them safely
 			if reflect.DeepEqual(cps[i].MatchersRaw, cps[j].MatchersRaw) {
@@ -1121,6 +1128,12 @@ func consolidateConnPolicies(cps caddytls.ConnectionPolicies) (caddytls.Connecti
 					return nil, fmt.Errorf("two policies with same match criteria have conflicting default SNI: %s vs. %s",
 						cps[i].DefaultSNI, cps[j].DefaultSNI)
 				}
+				if cps[i].FallbackSNI != "" &&
+					cps[j].FallbackSNI != "" &&
+					cps[i].FallbackSNI != cps[j].FallbackSNI {
+					return nil, fmt.Errorf("two policies with same match criteria have conflicting fallback SNI: %s vs. %s",
+						cps[i].FallbackSNI, cps[j].FallbackSNI)
+				}
 				if cps[i].ProtocolMin != "" &&
 					cps[j].ProtocolMin != "" &&
 					cps[i].ProtocolMin != cps[j].ProtocolMin {
@@ -1161,6 +1174,9 @@ func consolidateConnPolicies(cps caddytls.ConnectionPolicies) (caddytls.Connecti
 				if cps[i].DefaultSNI == "" && cps[j].DefaultSNI != "" {
 					cps[i].DefaultSNI = cps[j].DefaultSNI
 				}
+				if cps[i].FallbackSNI == "" && cps[j].FallbackSNI != "" {
+					cps[i].FallbackSNI = cps[j].FallbackSNI
+				}
 				if cps[i].ProtocolMin == "" && cps[j].ProtocolMin != "" {
 					cps[i].ProtocolMin = cps[j].ProtocolMin
 				}
@@ -1180,12 +1196,13 @@ func consolidateConnPolicies(cps caddytls.ConnectionPolicies) (caddytls.Connecti
 					}
 				}
 
-				cps = append(cps[:j], cps[j+1:]...)
+				cps = slices.Delete(cps, j, j+1)
 				i--
 				break
 			}
 		}
 	}
+
 	return cps, nil
 }
 

caddyconfig/httpcaddyfile/options.go

@@ -19,6 +19,7 @@ import (
 	"strconv"
 
 	"github.com/caddyserver/certmagic"
+	"github.com/libdns/libdns"
 	"github.com/mholt/acmez/v3/acme"
 
 	"github.com/caddyserver/caddy/v2"
@@ -45,7 +46,7 @@ func init() {
 	RegisterGlobalOption("ocsp_interval", parseOptDuration)
 	RegisterGlobalOption("acme_ca", parseOptSingleString)
 	RegisterGlobalOption("acme_ca_root", parseOptSingleString)
-	RegisterGlobalOption("acme_dns", parseOptACMEDNS)
+	RegisterGlobalOption("acme_dns", parseOptDNS)
 	RegisterGlobalOption("acme_eab", parseOptACMEEAB)
 	RegisterGlobalOption("cert_issuer", parseOptCertIssuer)
 	RegisterGlobalOption("skip_install_trust", parseOptTrue)
@@ -62,6 +63,8 @@ func init() {
 	RegisterGlobalOption("log", parseLogOptions)
 	RegisterGlobalOption("preferred_chains", parseOptPreferredChains)
 	RegisterGlobalOption("persist_config", parseOptPersistConfig)
+	RegisterGlobalOption("dns", parseOptDNS)
+	RegisterGlobalOption("ech", parseOptECH)
 }
 
 func parseOptTrue(d *caddyfile.Dispenser, _ any) (any, error) { return true, nil }
@@ -238,25 +241,6 @@ func parseOptDuration(d *caddyfile.Dispenser, _ any) (any, error) {
 	return caddy.Duration(dur), nil
 }
 
-func parseOptACMEDNS(d *caddyfile.Dispenser, _ any) (any, error) {
-	if !d.Next() { // consume option name
-		return nil, d.ArgErr()
-	}
-	if !d.Next() { // get DNS module name
-		return nil, d.ArgErr()
-	}
-	modID := "dns.providers." + d.Val()
-	unm, err := caddyfile.UnmarshalModule(d, modID)
-	if err != nil {
-		return nil, err
-	}
-	prov, ok := unm.(certmagic.DNSProvider)
-	if !ok {
-		return nil, d.Errf("module %s (%T) is not a certmagic.DNSProvider", modID, unm)
-	}
-	return prov, nil
-}
-
 func parseOptACMEEAB(d *caddyfile.Dispenser, _ any) (any, error) {
 	eab := new(acme.EAB)
 	d.Next() // consume option name
@@ -570,3 +554,68 @@ func parseOptPreferredChains(d *caddyfile.Dispenser, _ any) (any, error) {
 	d.Next()
 	return caddytls.ParseCaddyfilePreferredChainsOptions(d)
 }
+
+func parseOptDNS(d *caddyfile.Dispenser, _ any) (any, error) {
+	d.Next() // consume option name
+
+	if !d.Next() { // get DNS module name
+		return nil, d.ArgErr()
+	}
+	modID := "dns.providers." + d.Val()
+	unm, err := caddyfile.UnmarshalModule(d, modID)
+	if err != nil {
+		return nil, err
+	}
+	switch unm.(type) {
+	case libdns.RecordGetter,
+		libdns.RecordSetter,
+		libdns.RecordAppender,
+		libdns.RecordDeleter:
+	default:
+		return nil, d.Errf("module %s (%T) is not a libdns provider", modID, unm)
+	}
+	return unm, nil
+}
+
+func parseOptECH(d *caddyfile.Dispenser, _ any) (any, error) {
+	d.Next() // consume option name
+
+	ech := new(caddytls.ECH)
+
+	publicNames := d.RemainingArgs()
+	for _, publicName := range publicNames {
+		ech.Configs = append(ech.Configs, caddytls.ECHConfiguration{
+			PublicName: publicName,
+		})
+	}
+	if len(ech.Configs) == 0 {
+		return nil, d.ArgErr()
+	}
+
+	for nesting := d.Nesting(); d.NextBlock(nesting); {
+		switch d.Val() {
+		case "dns":
+			if !d.Next() {
+				return nil, d.ArgErr()
+			}
+			providerName := d.Val()
+			modID := "dns.providers." + providerName
+			unm, err := caddyfile.UnmarshalModule(d, modID)
+			if err != nil {
+				return nil, err
+			}
+			ech.Publication = append(ech.Publication, &caddytls.ECHPublication{
+				Configs: publicNames,
+				PublishersRaw: caddy.ModuleMap{
+					"dns": caddyconfig.JSON(caddytls.ECHDNSPublisher{
+						ProviderRaw: caddyconfig.JSONModuleObject(unm, "name", providerName, nil),
+					}, nil),
+				},
+			})
+		default:
+			return nil, d.Errf("ech: unrecognized subdirective '%s'", d.Val())
+		}
+	}
+
+	return ech, nil
+}

caddyconfig/httpcaddyfile/serveroptions.go

@@ -246,6 +246,8 @@ func unmarshalCaddyfileServerOptions(d *caddyfile.Dispenser) (any, error) {
 				switch d.Val() {
 				case "per_host":
 					serverOpts.Metrics.PerHost = true
+				default:
+					return nil, d.Errf("unrecognized metrics option '%s'", d.Val())
 				}
 			}
 

caddyconfig/httpcaddyfile/tlsapp.go

@@ -92,11 +92,9 @@ func (st ServerType) buildTLSApp(
 		tlsApp.Automation.Policies = append(tlsApp.Automation.Policies, catchAllAP)
 	}
 
-	// collect all hosts that have a wildcard in them, and arent HTTP
+	var wildcardHosts []string                        // collect all hosts that have a wildcard in them, and aren't HTTP
-	wildcardHosts := []string{}
+	forcedAutomatedNames := make(map[string]struct{}) // explicitly configured to be automated, even if covered by a wildcard
-	// hosts that have been explicitly marked to be automated,
+
-	// even if covered by another wildcard
-	forcedAutomatedNames := make(map[string]struct{})
 	for _, p := range pairings {
 		var addresses []string
 		for _, addressWithProtocols := range p.addressesWithProtocols {
@@ -153,7 +151,7 @@ func (st ServerType) buildTLSApp(
 				ap.OnDemand = true
 			}
 
-			// collect hosts that are forced to be automated
+			// collect hosts that are forced to have certs automated for their specific name
 			if _, ok := sblock.pile["tls.force_automate"]; ok {
 				for _, host := range sblockHosts {
 					forcedAutomatedNames[host] = struct{}{}
@@ -340,7 +338,7 @@ func (st ServerType) buildTLSApp(
 					combined = reflect.New(reflect.TypeOf(cl)).Elem()
 				}
 				clVal := reflect.ValueOf(cl)
-				for i := 0; i < clVal.Len(); i++ {
+				for i := range clVal.Len() {
 					combined = reflect.Append(combined, clVal.Index(i))
 				}
 				loadersByName[name] = combined.Interface().(caddytls.CertificateLoader)
@@ -359,6 +357,32 @@ func (st ServerType) buildTLSApp(
 		tlsApp.Automation.OnDemand = onDemand
 	}
 
+	// set up "global" (to the TLS app) DNS provider config
+	if globalDNS, ok := options["dns"]; ok && globalDNS != nil {
+		tlsApp.DNSRaw = caddyconfig.JSONModuleObject(globalDNS, "name", globalDNS.(caddy.Module).CaddyModule().ID.Name(), nil)
+	}
+
+	// set up ECH from Caddyfile options
+	if ech, ok := options["ech"].(*caddytls.ECH); ok {
+		tlsApp.EncryptedClientHello = ech
+
+		// outer server names will need certificates, so make sure they're included
+		// in an automation policy for them that applies any global options
+		ap, err := newBaseAutomationPolicy(options, warnings, true)
+		if err != nil {
+			return nil, warnings, err
+		}
+		for _, cfg := range ech.Configs {
+			if cfg.PublicName != "" {
+				ap.SubjectsRaw = append(ap.SubjectsRaw, cfg.PublicName)
+			}
+		}
+		if tlsApp.Automation == nil {
+			tlsApp.Automation = new(caddytls.AutomationConfig)
+		}
+		tlsApp.Automation.Policies = append(tlsApp.Automation.Policies, ap)
+	}
+
 	// if the storage clean interval is a boolean, then it's "off" to disable cleaning
 	if sc, ok := options["storage_check"].(string); ok && sc == "off" {
 		tlsApp.DisableStorageCheck = true
@@ -445,7 +469,7 @@ func (st ServerType) buildTLSApp(
 		globalPreferredChains := options["preferred_chains"]
 		hasGlobalACMEDefaults := globalEmail != nil || globalACMECA != nil || globalACMECARoot != nil || globalACMEDNS != nil || globalACMEEAB != nil || globalPreferredChains != nil
 		if hasGlobalACMEDefaults {
-			for i := 0; i < len(tlsApp.Automation.Policies); i++ {
+			for i := range tlsApp.Automation.Policies {
 				ap := tlsApp.Automation.Policies[i]
 				if len(ap.Issuers) == 0 && automationPolicyHasAllPublicNames(ap) {
 					// for public names, create default issuers which will later be filled in with configured global defaults
@@ -553,7 +577,8 @@ func fillInGlobalACMEDefaults(issuer certmagic.Issuer, options map[string]any) e
 	if globalPreferredChains != nil && acmeIssuer.PreferredChains == nil {
 		acmeIssuer.PreferredChains = globalPreferredChains.(*caddytls.ChainPreference)
 	}
-	if globalHTTPPort != nil && (acmeIssuer.Challenges == nil || acmeIssuer.Challenges.HTTP == nil || acmeIssuer.Challenges.HTTP.AlternatePort == 0) {
+	// only configure alt HTTP and TLS-ALPN ports if the DNS challenge is not enabled (wouldn't hurt, but isn't necessary since the DNS challenge is exclusive of others)
+	if globalHTTPPort != nil && (acmeIssuer.Challenges == nil || acmeIssuer.Challenges.DNS == nil) && (acmeIssuer.Challenges == nil || acmeIssuer.Challenges.HTTP == nil || acmeIssuer.Challenges.HTTP.AlternatePort == 0) {
 		if acmeIssuer.Challenges == nil {
 			acmeIssuer.Challenges = new(caddytls.ChallengesConfig)
 		}
@@ -562,7 +587,7 @@ func fillInGlobalACMEDefaults(issuer certmagic.Issuer, options map[string]any) e
 		}
 		acmeIssuer.Challenges.HTTP.AlternatePort = globalHTTPPort.(int)
 	}
-	if globalHTTPSPort != nil && (acmeIssuer.Challenges == nil || acmeIssuer.Challenges.TLSALPN == nil || acmeIssuer.Challenges.TLSALPN.AlternatePort == 0) {
+	if globalHTTPSPort != nil && (acmeIssuer.Challenges == nil || acmeIssuer.Challenges.DNS == nil) && (acmeIssuer.Challenges == nil || acmeIssuer.Challenges.TLSALPN == nil || acmeIssuer.Challenges.TLSALPN.AlternatePort == 0) {
 		if acmeIssuer.Challenges == nil {
 			acmeIssuer.Challenges = new(caddytls.ChallengesConfig)
 		}

caddytest/caddytest.go

@@ -31,8 +31,8 @@ import (
 	_ "github.com/caddyserver/caddy/v2/modules/standard"
 )
 
-// Defaults store any configuration required to make the tests run
+// Config store any configuration required to make the tests run
-type Defaults struct {
+type Config struct {
 	// Port we expect caddy to listening on
 	AdminPort int
 	// Certificates we expect to be loaded before attempting to run the tests
@@ -44,7 +44,7 @@ type Defaults struct {
 }
 
 // Default testing values
-var Default = Defaults{
+var Default = Config{
 	AdminPort:          2999, // different from what a real server also running on a developer's machine might be
 	Certificates:       []string{"/caddy.localhost.crt", "/caddy.localhost.key"},
 	TestRequestTimeout: 5 * time.Second,
@@ -61,6 +61,7 @@ type Tester struct {
 	Client       *http.Client
 	configLoaded bool
 	t            testing.TB
+	config       Config
 }
 
 // NewTester will create a new testing client with an attached cookie jar
@@ -78,9 +79,29 @@ func NewTester(t testing.TB) *Tester {
 		},
 		configLoaded: false,
 		t:            t,
+		config:       Default,
 	}
 }
 
+// WithDefaultOverrides this will override the default test configuration with the provided values.
+func (tc *Tester) WithDefaultOverrides(overrides Config) *Tester {
+	if overrides.AdminPort != 0 {
+		tc.config.AdminPort = overrides.AdminPort
+	}
+	if len(overrides.Certificates) > 0 {
+		tc.config.Certificates = overrides.Certificates
+	}
+	if overrides.TestRequestTimeout != 0 {
+		tc.config.TestRequestTimeout = overrides.TestRequestTimeout
+		tc.Client.Timeout = overrides.TestRequestTimeout
+	}
+	if overrides.LoadRequestTimeout != 0 {
+		tc.config.LoadRequestTimeout = overrides.LoadRequestTimeout
+	}
+
+	return tc
+}
+
 type configLoadError struct {
 	Response string
 }
@@ -113,7 +134,7 @@ func (tc *Tester) initServer(rawConfig string, configType string) error {
 		return nil
 	}
 
-	err := validateTestPrerequisites(tc.t)
+	err := validateTestPrerequisites(tc)
 	if err != nil {
 		tc.t.Skipf("skipping tests as failed integration prerequisites. %s", err)
 		return nil
@@ -121,7 +142,7 @@ func (tc *Tester) initServer(rawConfig string, configType string) error {
 
 	tc.t.Cleanup(func() {
 		if tc.t.Failed() && tc.configLoaded {
-			res, err := http.Get(fmt.Sprintf("http://localhost:%d/config/", Default.AdminPort))
+			res, err := http.Get(fmt.Sprintf("http://localhost:%d/config/", tc.config.AdminPort))
 			if err != nil {
 				tc.t.Log("unable to read the current config")
 				return
@@ -151,10 +172,10 @@ func (tc *Tester) initServer(rawConfig string, configType string) error {
 		tc.t.Logf("After: %s", rawConfig)
 	}
 	client := &http.Client{
-		Timeout: Default.LoadRequestTimeout,
+		Timeout: tc.config.LoadRequestTimeout,
 	}
 	start := time.Now()
-	req, err := http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/load", Default.AdminPort), strings.NewReader(rawConfig))
+	req, err := http.NewRequest("POST", fmt.Sprintf("http://localhost:%d/load", tc.config.AdminPort), strings.NewReader(rawConfig))
 	if err != nil {
 		tc.t.Errorf("failed to create request. %s", err)
 		return err
@@ -205,11 +226,11 @@ func (tc *Tester) ensureConfigRunning(rawConfig string, configType string) error
 	}
 
 	client := &http.Client{
-		Timeout: Default.LoadRequestTimeout,
+		Timeout: tc.config.LoadRequestTimeout,
 	}
 
 	fetchConfig := func(client *http.Client) any {
-		resp, err := client.Get(fmt.Sprintf("http://localhost:%d/config/", Default.AdminPort))
+		resp, err := client.Get(fmt.Sprintf("http://localhost:%d/config/", tc.config.AdminPort))
 		if err != nil {
 			return nil
 		}
@@ -237,30 +258,30 @@ func (tc *Tester) ensureConfigRunning(rawConfig string, configType string) error
 }
 
 const initConfig = `{
-	admin localhost:2999
+	admin localhost:%d
 }
 `
 
 // validateTestPrerequisites ensures the certificates are available in the
 // designated path and Caddy sub-process is running.
-func validateTestPrerequisites(t testing.TB) error {
+func validateTestPrerequisites(tc *Tester) error {
 	// check certificates are found
-	for _, certName := range Default.Certificates {
+	for _, certName := range tc.config.Certificates {
 		if _, err := os.Stat(getIntegrationDir() + certName); errors.Is(err, fs.ErrNotExist) {
 			return fmt.Errorf("caddy integration test certificates (%s) not found", certName)
 		}
 	}
 
-	if isCaddyAdminRunning() != nil {
+	if isCaddyAdminRunning(tc) != nil {
 		// setup the init config file, and set the cleanup afterwards
 		f, err := os.CreateTemp("", "")
 		if err != nil {
 			return err
 		}
-		t.Cleanup(func() {
+		tc.t.Cleanup(func() {
 			os.Remove(f.Name())
 		})
-		if _, err := f.WriteString(initConfig); err != nil {
+		if _, err := f.WriteString(fmt.Sprintf(initConfig, tc.config.AdminPort)); err != nil {
 			return err
 		}
 
@@ -271,23 +292,23 @@ func validateTestPrerequisites(t testing.TB) error {
 		}()
 
 		// wait for caddy to start serving the initial config
-		for retries := 10; retries > 0 && isCaddyAdminRunning() != nil; retries-- {
+		for retries := 10; retries > 0 && isCaddyAdminRunning(tc) != nil; retries-- {
 			time.Sleep(1 * time.Second)
 		}
 	}
 
 	// one more time to return the error
-	return isCaddyAdminRunning()
+	return isCaddyAdminRunning(tc)
 }
 
-func isCaddyAdminRunning() error {
+func isCaddyAdminRunning(tc *Tester) error {
 	// assert that caddy is running
 	client := &http.Client{
-		Timeout: Default.LoadRequestTimeout,
+		Timeout: tc.config.LoadRequestTimeout,
 	}
-	resp, err := client.Get(fmt.Sprintf("http://localhost:%d/config/", Default.AdminPort))
+	resp, err := client.Get(fmt.Sprintf("http://localhost:%d/config/", tc.config.AdminPort))
 	if err != nil {
-		return fmt.Errorf("caddy integration test caddy server not running. Expected to be listening on localhost:%d", Default.AdminPort)
+		return fmt.Errorf("caddy integration test caddy server not running. Expected to be listening on localhost:%d", tc.config.AdminPort)
 	}
 	resp.Body.Close()
 

caddytest/integration/caddyfile_adapt/acme_server_policy-allow.caddyfiletest

@@ -0,0 +1,72 @@
+{
+	pki {
+		ca custom-ca {
+			name "Custom CA"
+		}
+	}
+}
+
+acme.example.com {
+	acme_server {
+		ca custom-ca
+		allow {
+			domains host-1.internal.example.com host-2.internal.example.com
+		}
+	}
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"host": [
+										"acme.example.com"
+									]
+								}
+							],
+							"handle": [
+								{
+									"handler": "subroute",
+									"routes": [
+										{
+											"handle": [
+												{
+													"ca": "custom-ca",
+													"handler": "acme_server",
+													"policy": {
+														"allow": {
+															"domains": [
+																"host-1.internal.example.com",
+																"host-2.internal.example.com"
+															]
+														}
+													}
+												}
+											]
+										}
+									]
+								}
+							],
+							"terminal": true
+						}
+					]
+				}
+			}
+		},
+		"pki": {
+			"certificate_authorities": {
+				"custom-ca": {
+					"name": "Custom CA"
+				}
+			}
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/acme_server_policy-both.caddyfiletest

@@ -0,0 +1,80 @@
+{
+	pki {
+		ca custom-ca {
+			name "Custom CA"
+		}
+	}
+}
+
+acme.example.com {
+	acme_server {
+		ca custom-ca
+		allow {
+			domains host-1.internal.example.com host-2.internal.example.com
+		}
+		deny {
+			domains dc.internal.example.com
+		}
+	}
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"host": [
+										"acme.example.com"
+									]
+								}
+							],
+							"handle": [
+								{
+									"handler": "subroute",
+									"routes": [
+										{
+											"handle": [
+												{
+													"ca": "custom-ca",
+													"handler": "acme_server",
+													"policy": {
+														"allow": {
+															"domains": [
+																"host-1.internal.example.com",
+																"host-2.internal.example.com"
+															]
+														},
+														"deny": {
+															"domains": [
+																"dc.internal.example.com"
+															]
+														}
+													}
+												}
+											]
+										}
+									]
+								}
+							],
+							"terminal": true
+						}
+					]
+				}
+			}
+		},
+		"pki": {
+			"certificate_authorities": {
+				"custom-ca": {
+					"name": "Custom CA"
+				}
+			}
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/acme_server_policy-deny.caddyfiletest

@@ -0,0 +1,71 @@
+{
+	pki {
+		ca custom-ca {
+			name "Custom CA"
+		}
+	}
+}
+
+acme.example.com {
+	acme_server {
+		ca custom-ca
+		deny {
+			domains dc.internal.example.com
+		}
+	}
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"host": [
+										"acme.example.com"
+									]
+								}
+							],
+							"handle": [
+								{
+									"handler": "subroute",
+									"routes": [
+										{
+											"handle": [
+												{
+													"ca": "custom-ca",
+													"handler": "acme_server",
+													"policy": {
+														"deny": {
+															"domains": [
+																"dc.internal.example.com"
+															]
+														}
+													}
+												}
+											]
+										}
+									]
+								}
+							],
+							"terminal": true
+						}
+					]
+				}
+			}
+		},
+		"pki": {
+			"certificate_authorities": {
+				"custom-ca": {
+					"name": "Custom CA"
+				}
+			}
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/auto_https_prefer_wildcard.caddyfiletest

@@ -1,109 +0,0 @@
-{
-	auto_https prefer_wildcard
-}
-
-*.example.com {
-	tls {
-		dns mock
-	}
-	respond "fallback"
-}
-
-foo.example.com {
-	respond "foo"
-}
-----------
-{
-	"apps": {
-		"http": {
-			"servers": {
-				"srv0": {
-					"listen": [
-						":443"
-					],
-					"routes": [
-						{
-							"match": [
-								{
-									"host": [
-										"foo.example.com"
-									]
-								}
-							],
-							"handle": [
-								{
-									"handler": "subroute",
-									"routes": [
-										{
-											"handle": [
-												{
-													"body": "foo",
-													"handler": "static_response"
-												}
-											]
-										}
-									]
-								}
-							],
-							"terminal": true
-						},
-						{
-							"match": [
-								{
-									"host": [
-										"*.example.com"
-									]
-								}
-							],
-							"handle": [
-								{
-									"handler": "subroute",
-									"routes": [
-										{
-											"handle": [
-												{
-													"body": "fallback",
-													"handler": "static_response"
-												}
-											]
-										}
-									]
-								}
-							],
-							"terminal": true
-						}
-					],
-					"automatic_https": {
-						"skip_certificates": [
-							"foo.example.com"
-						],
-						"prefer_wildcard": true
-					}
-				}
-			}
-		},
-		"tls": {
-			"automation": {
-				"policies": [
-					{
-						"subjects": [
-							"*.example.com"
-						],
-						"issuers": [
-							{
-								"challenges": {
-									"dns": {
-										"provider": {
-											"name": "mock"
-										}
-									}
-								},
-								"module": "acme"
-							}
-						]
-					}
-				]
-			}
-		}
-	}
-}

caddytest/integration/caddyfile_adapt/auto_https_prefer_wildcard_multi.caddyfiletest

@@ -1,268 +0,0 @@
-{
-	auto_https prefer_wildcard
-}
-
-# Covers two domains
-*.one.example.com {
-	tls {
-		dns mock
-	}
-	respond "one fallback"
-}
-
-# Is covered, should not get its own AP
-foo.one.example.com {
-	respond "foo one"
-}
-
-# This one has its own tls config so it doesn't get covered (escape hatch)
-bar.one.example.com {
-	respond "bar one"
-	tls bar@bar.com
-}
-
-# Covers nothing but AP gets consolidated with the first
-*.two.example.com {
-	tls {
-		dns mock
-	}
-	respond "two fallback"
-}
-
-# Is HTTP so it should not cover
-http://*.three.example.com {
-	respond "three fallback"
-}
-
-# Has no wildcard coverage so it gets an AP
-foo.three.example.com {
-	respond "foo three"
-}
-----------
-{
-	"apps": {
-		"http": {
-			"servers": {
-				"srv0": {
-					"listen": [
-						":443"
-					],
-					"routes": [
-						{
-							"match": [
-								{
-									"host": [
-										"foo.three.example.com"
-									]
-								}
-							],
-							"handle": [
-								{
-									"handler": "subroute",
-									"routes": [
-										{
-											"handle": [
-												{
-													"body": "foo three",
-													"handler": "static_response"
-												}
-											]
-										}
-									]
-								}
-							],
-							"terminal": true
-						},
-						{
-							"match": [
-								{
-									"host": [
-										"foo.one.example.com"
-									]
-								}
-							],
-							"handle": [
-								{
-									"handler": "subroute",
-									"routes": [
-										{
-											"handle": [
-												{
-													"body": "foo one",
-													"handler": "static_response"
-												}
-											]
-										}
-									]
-								}
-							],
-							"terminal": true
-						},
-						{
-							"match": [
-								{
-									"host": [
-										"bar.one.example.com"
-									]
-								}
-							],
-							"handle": [
-								{
-									"handler": "subroute",
-									"routes": [
-										{
-											"handle": [
-												{
-													"body": "bar one",
-													"handler": "static_response"
-												}
-											]
-										}
-									]
-								}
-							],
-							"terminal": true
-						},
-						{
-							"match": [
-								{
-									"host": [
-										"*.one.example.com"
-									]
-								}
-							],
-							"handle": [
-								{
-									"handler": "subroute",
-									"routes": [
-										{
-											"handle": [
-												{
-													"body": "one fallback",
-													"handler": "static_response"
-												}
-											]
-										}
-									]
-								}
-							],
-							"terminal": true
-						},
-						{
-							"match": [
-								{
-									"host": [
-										"*.two.example.com"
-									]
-								}
-							],
-							"handle": [
-								{
-									"handler": "subroute",
-									"routes": [
-										{
-											"handle": [
-												{
-													"body": "two fallback",
-													"handler": "static_response"
-												}
-											]
-										}
-									]
-								}
-							],
-							"terminal": true
-						}
-					],
-					"automatic_https": {
-						"skip_certificates": [
-							"foo.one.example.com",
-							"bar.one.example.com"
-						],
-						"prefer_wildcard": true
-					}
-				},
-				"srv1": {
-					"listen": [
-						":80"
-					],
-					"routes": [
-						{
-							"match": [
-								{
-									"host": [
-										"*.three.example.com"
-									]
-								}
-							],
-							"handle": [
-								{
-									"handler": "subroute",
-									"routes": [
-										{
-											"handle": [
-												{
-													"body": "three fallback",
-													"handler": "static_response"
-												}
-											]
-										}
-									]
-								}
-							],
-							"terminal": true
-						}
-					],
-					"automatic_https": {
-						"prefer_wildcard": true
-					}
-				}
-			}
-		},
-		"tls": {
-			"automation": {
-				"policies": [
-					{
-						"subjects": [
-							"foo.three.example.com"
-						]
-					},
-					{
-						"subjects": [
-							"bar.one.example.com"
-						],
-						"issuers": [
-							{
-								"email": "bar@bar.com",
-								"module": "acme"
-							},
-							{
-								"ca": "https://acme.zerossl.com/v2/DV90",
-								"email": "bar@bar.com",
-								"module": "acme"
-							}
-						]
-					},
-					{
-						"subjects": [
-							"*.one.example.com",
-							"*.two.example.com"
-						],
-						"issuers": [
-							{
-								"challenges": {
-									"dns": {
-										"provider": {
-											"name": "mock"
-										}
-									}
-								},
-								"module": "acme"
-							}
-						]
-					}
-				]
-			}
-		}
-	}
-}

caddytest/integration/caddyfile_adapt/reverse_proxy_http_transport_forward_proxy_url.txt

@@ -0,0 +1,41 @@
+:8884
+reverse_proxy 127.0.0.1:65535 {
+	transport http {
+		forward_proxy_url http://localhost:8080
+	}
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":8884"
+					],
+					"routes": [
+						{
+							"handle": [
+								{
+									"handler": "reverse_proxy",
+									"transport": {
+										"network_proxy": {
+											"from": "url",
+											"url": "http://localhost:8080"
+										},
+										"protocol": "http"
+									},
+									"upstreams": [
+										{
+											"dial": "127.0.0.1:65535"
+										}
+									]
+								}
+							]
+						}
+					]
+				}
+			}
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/reverse_proxy_http_transport_none_proxy.txt

@@ -0,0 +1,40 @@
+:8884
+reverse_proxy 127.0.0.1:65535 {
+	transport http {
+		network_proxy none
+	}
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":8884"
+					],
+					"routes": [
+						{
+							"handle": [
+								{
+									"handler": "reverse_proxy",
+									"transport": {
+										"network_proxy": {
+											"from": "none"
+										},
+										"protocol": "http"
+									},
+									"upstreams": [
+										{
+											"dial": "127.0.0.1:65535"
+										}
+									]
+								}
+							]
+						}
+					]
+				}
+			}
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/reverse_proxy_http_transport_url_proxy.txt

@@ -0,0 +1,41 @@
+:8884
+reverse_proxy 127.0.0.1:65535 {
+	transport http {
+		network_proxy url http://localhost:8080
+	}
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":8884"
+					],
+					"routes": [
+						{
+							"handle": [
+								{
+									"handler": "reverse_proxy",
+									"transport": {
+										"network_proxy": {
+											"from": "url",
+											"url": "http://localhost:8080"
+										},
+										"protocol": "http"
+									},
+									"upstreams": [
+										{
+											"dial": "127.0.0.1:65535"
+										}
+									]
+								}
+							]
+						}
+					]
+				}
+			}
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/tls_automation_wildcard_force_automate.caddyfiletest

@@ -131,13 +131,7 @@ shadowed.example.com {
 						{
 							"match": {
 								"sni": [
-									"automated1.example.com"
+									"automated1.example.com",
-								]
-							}
-						},
-						{
-							"match": {
-								"sni": [
 									"automated2.example.com"
 								]
 							}

cmd/commandfuncs.go

@@ -24,6 +24,7 @@ import (
 	"io"
 	"io/fs"
 	"log"
+	"maps"
 	"net"
 	"net/http"
 	"os"
@@ -171,6 +172,10 @@ func cmdStart(fl Flags) (int, error) {
 func cmdRun(fl Flags) (int, error) {
 	caddy.TrapSignals()
 
+	logger := caddy.Log()
+	undoMaxProcs := setResourceLimits(logger)
+	defer undoMaxProcs()
+
 	configFlag := fl.String("config")
 	configAdapterFlag := fl.String("adapter")
 	resumeFlag := fl.Bool("resume")
@@ -196,18 +201,18 @@ func cmdRun(fl Flags) (int, error) {
 		config, err = os.ReadFile(caddy.ConfigAutosavePath)
 		if errors.Is(err, fs.ErrNotExist) {
 			// not a bad error; just can't resume if autosave file doesn't exist
-			caddy.Log().Info("no autosave file exists", zap.String("autosave_file", caddy.ConfigAutosavePath))
+			logger.Info("no autosave file exists", zap.String("autosave_file", caddy.ConfigAutosavePath))
 			resumeFlag = false
 		} else if err != nil {
 			return caddy.ExitCodeFailedStartup, err
 		} else {
 			if configFlag == "" {
-				caddy.Log().Info("resuming from last configuration",
+				logger.Info("resuming from last configuration",
 					zap.String("autosave_file", caddy.ConfigAutosavePath))
 			} else {
 				// if they also specified a config file, user should be aware that we're not
 				// using it (doing so could lead to data/config loss by overwriting!)
-				caddy.Log().Warn("--config and --resume flags were used together; ignoring --config and resuming from last configuration",
+				logger.Warn("--config and --resume flags were used together; ignoring --config and resuming from last configuration",
 					zap.String("autosave_file", caddy.ConfigAutosavePath))
 			}
 		}
@@ -225,7 +230,7 @@ func cmdRun(fl Flags) (int, error) {
 	if pidfileFlag != "" {
 		err := caddy.PIDFile(pidfileFlag)
 		if err != nil {
-			caddy.Log().Error("unable to write PID file",
+			logger.Error("unable to write PID file",
 				zap.String("pidfile", pidfileFlag),
 				zap.Error(err))
 		}
@@ -236,7 +241,7 @@ func cmdRun(fl Flags) (int, error) {
 	if err != nil {
 		return caddy.ExitCodeFailedStartup, fmt.Errorf("loading initial config: %v", err)
 	}
-	caddy.Log().Info("serving initial configuration")
+	logger.Info("serving initial configuration")
 
 	// if we are to report to another process the successful start
 	// of the server, do so now by echoing back contents of stdin
@@ -272,15 +277,15 @@ func cmdRun(fl Flags) (int, error) {
 	switch runtime.GOOS {
 	case "windows":
 		if os.Getenv("HOME") == "" && os.Getenv("USERPROFILE") == "" && !hasXDG {
-			caddy.Log().Warn("neither HOME nor USERPROFILE environment variables are set - please fix; some assets might be stored in ./caddy")
+			logger.Warn("neither HOME nor USERPROFILE environment variables are set - please fix; some assets might be stored in ./caddy")
 		}
 	case "plan9":
 		if os.Getenv("home") == "" && !hasXDG {
-			caddy.Log().Warn("$home environment variable is empty - please fix; some assets might be stored in ./caddy")
+			logger.Warn("$home environment variable is empty - please fix; some assets might be stored in ./caddy")
 		}
 	default:
 		if os.Getenv("HOME") == "" && !hasXDG {
-			caddy.Log().Warn("$HOME environment variable is empty - please fix; some assets might be stored in ./caddy")
+			logger.Warn("$HOME environment variable is empty - please fix; some assets might be stored in ./caddy")
 		}
 	}
 
@@ -699,9 +704,7 @@ func AdminAPIRequest(adminAddr, method, uri string, headers http.Header, body io
 	if body != nil {
 		req.Header.Set("Content-Type", "application/json")
 	}
-	for k, v := range headers {
+	maps.Copy(req.Header, headers)
-		req.Header[k] = v
-	}
 
 	// make an HTTP client that dials our network type, since admin
 	// endpoints aren't always TCP, which is what the default transport

cmd/main.go

@@ -24,6 +24,7 @@ import (
 	"io"
 	"io/fs"
 	"log"
+	"log/slog"
 	"net"
 	"os"
 	"path/filepath"
@@ -33,10 +34,12 @@ import (
 	"strings"
 	"time"
 
+	"github.com/KimMachineGun/automemlimit/memlimit"
 	"github.com/caddyserver/certmagic"
 	"github.com/spf13/pflag"
 	"go.uber.org/automaxprocs/maxprocs"
 	"go.uber.org/zap"
+	"go.uber.org/zap/exp/zapslog"
 
 	"github.com/caddyserver/caddy/v2"
 	"github.com/caddyserver/caddy/v2/caddyconfig"
@@ -66,12 +69,6 @@ func Main() {
 		os.Exit(caddy.ExitCodeFailedStartup)
 	}
 
-	undo, err := maxprocs.Set()
-	defer undo()
-	if err != nil {
-		caddy.Log().Warn("failed to set GOMAXPROCS", zap.Error(err))
-	}
-
 	if err := defaultFactory.Build().Execute(); err != nil {
 		var exitError *exitError
 		if errors.As(err, &exitError) {
@@ -467,6 +464,31 @@ func printEnvironment() {
 	}
 }
 
+func setResourceLimits(logger *zap.Logger) func() {
+	// Configure the maximum number of CPUs to use to match the Linux container quota (if any)
+	// See https://pkg.go.dev/runtime#GOMAXPROCS
+	undo, err := maxprocs.Set(maxprocs.Logger(logger.Sugar().Infof))
+	if err != nil {
+		logger.Warn("failed to set GOMAXPROCS", zap.Error(err))
+	}
+
+	// Configure the maximum memory to use to match the Linux container quota (if any) or system memory
+	// See https://pkg.go.dev/runtime/debug#SetMemoryLimit
+	_, _ = memlimit.SetGoMemLimitWithOpts(
+		memlimit.WithLogger(
+			slog.New(zapslog.NewHandler(logger.Core())),
+		),
+		memlimit.WithProvider(
+			memlimit.ApplyFallback(
+				memlimit.FromCgroup,
+				memlimit.FromSystem,
+			),
+		),
+	)
+
+	return undo
+}
+
 // StringSlice is a flag.Value that enables repeated use of a string flag.
 type StringSlice []string
 

context.go

@@ -91,14 +91,14 @@ func (ctx *Context) OnCancel(f func()) {
 	ctx.cleanupFuncs = append(ctx.cleanupFuncs, f)
 }
 
-// Filesystems returns a ref to the FilesystemMap.
+// FileSystems returns a ref to the FilesystemMap.
 // EXPERIMENTAL: This API is subject to change.
-func (ctx *Context) Filesystems() FileSystems {
+func (ctx *Context) FileSystems() FileSystems {
 	// if no config is loaded, we use a default filesystemmap, which includes the osfs
 	if ctx.cfg == nil {
-		return &filesystems.FilesystemMap{}
+		return &filesystems.FileSystemMap{}
 	}
-	return ctx.cfg.filesystems
+	return ctx.cfg.fileSystems
 }
 
 // Returns the active metrics registry for the context
@@ -277,6 +277,14 @@ func (ctx Context) LoadModule(structPointer any, fieldName string) (any, error)
 	return result, nil
 }
 
+// emitEvent is a small convenience method so the caddy core can emit events, if the event app is configured.
+func (ctx Context) emitEvent(name string, data map[string]any) Event {
+	if ctx.cfg == nil || ctx.cfg.eventEmitter == nil {
+		return Event{}
+	}
+	return ctx.cfg.eventEmitter.Emit(ctx, name, data)
+}
+
 // loadModulesFromSomeMap loads modules from val, which must be a type of map[string]any.
 // Depending on inlineModuleKey, it will be interpreted as either a ModuleMap (key is the module
 // name) or as a regular map (key is not the module name, and module name is defined inline).
@@ -385,6 +393,17 @@ func (ctx Context) LoadModuleByID(id string, rawMsg json.RawMessage) (any, error
 		return nil, fmt.Errorf("module value cannot be null")
 	}
 
+	// if this is an app module, keep a reference to it,
+	// since submodules may need to reference it during
+	// provisioning (even though the parent app module
+	// may not be fully provisioned yet; this is the case
+	// with the tls app's automation policies, which may
+	// refer to the tls app to check if a global DNS
+	// module has been configured for DNS challenges)
+	if appModule, ok := val.(App); ok {
+		ctx.cfg.apps[id] = appModule
+	}
+
 	ctx.ancestry = append(ctx.ancestry, val)
 
 	if prov, ok := val.(Provisioner); ok {
@@ -418,6 +437,14 @@ func (ctx Context) LoadModuleByID(id string, rawMsg json.RawMessage) (any, error
 
 	ctx.moduleInstances[id] = append(ctx.moduleInstances[id], val)
 
+	// if the loaded module happens to be an app that can emit events, store it so the
+	// core can have access to emit events without an import cycle
+	if ee, ok := val.(eventEmitter); ok {
+		if _, ok := ee.(App); ok {
+			ctx.cfg.eventEmitter = ee
+		}
+	}
+
 	return val, nil
 }
 
@@ -471,7 +498,6 @@ func (ctx Context) App(name string) (any, error) {
 	if appRaw != nil {
 		ctx.cfg.AppsRaw[name] = nil // allow GC to deallocate
 	}
-	ctx.cfg.apps[name] = modVal.(App)
 	return modVal, nil
 }
 
@@ -551,11 +577,11 @@ func (ctx Context) Slogger() *slog.Logger {
 		if err != nil {
 			panic("config missing, unable to create dev logger: " + err.Error())
 		}
-		return slog.New(zapslog.NewHandler(l.Core(), nil))
+		return slog.New(zapslog.NewHandler(l.Core()))
 	}
 	mod := ctx.Module()
 	if mod == nil {
-		return slog.New(zapslog.NewHandler(Log().Core(), nil))
+		return slog.New(zapslog.NewHandler(Log().Core()))
 	}
 	return slog.New(zapslog.NewHandler(ctx.cfg.Logging.Logger(mod).Core(),
 		zapslog.WithName(string(mod.CaddyModule().ID)),
@@ -590,3 +616,11 @@ func (ctx *Context) WithValue(key, value any) Context {
 		exitFuncs:       ctx.exitFuncs,
 	}
 }
+
+// eventEmitter is a small interface that inverts dependencies for
+// the caddyevents package, so the core can emit events without an
+// import cycle (i.e. the caddy package doesn't have to import
+// the caddyevents package, which imports the caddy package).
+type eventEmitter interface {
+	Emit(ctx Context, eventName string, data map[string]any) Event
+}

go.mod

@@ -1,31 +1,31 @@
 module github.com/caddyserver/caddy/v2
 
-go 1.22.3
+go 1.24
-
-toolchain go1.23.0
 
 require (
 	github.com/BurntSushi/toml v1.4.0
+	github.com/KimMachineGun/automemlimit v0.7.1
 	github.com/Masterminds/sprig/v3 v3.3.0
-	github.com/alecthomas/chroma/v2 v2.14.0
+	github.com/alecthomas/chroma/v2 v2.15.0
 	github.com/aryann/difflib v0.0.0-20210328193216-ff5ff6dc229b
-	github.com/caddyserver/certmagic v0.21.6
+	github.com/caddyserver/certmagic v0.23.0
 	github.com/caddyserver/zerossl v0.1.3
+	github.com/cloudflare/circl v1.6.0
 	github.com/dustin/go-humanize v1.0.1
-	github.com/go-chi/chi/v5 v5.0.12
+	github.com/go-chi/chi/v5 v5.2.1
-	github.com/google/cel-go v0.21.0
+	github.com/google/cel-go v0.24.1
 	github.com/google/uuid v1.6.0
-	github.com/klauspost/compress v1.17.11
+	github.com/klauspost/compress v1.18.0
-	github.com/klauspost/cpuid/v2 v2.2.9
+	github.com/klauspost/cpuid/v2 v2.2.10
-	github.com/mholt/acmez/v3 v3.0.0
+	github.com/mholt/acmez/v3 v3.1.2
 	github.com/prometheus/client_golang v1.19.1
-	github.com/quic-go/quic-go v0.48.2
+	github.com/quic-go/quic-go v0.51.0
 	github.com/smallstep/certificates v0.26.1
 	github.com/smallstep/nosql v0.6.1
 	github.com/smallstep/truststore v0.13.0
-	github.com/spf13/cobra v1.8.1
+	github.com/spf13/cobra v1.9.1
-	github.com/spf13/pflag v1.0.5
+	github.com/spf13/pflag v1.0.6
-	github.com/stretchr/testify v1.9.0
+	github.com/stretchr/testify v1.10.0
 	github.com/tailscale/tscert v0.0.0-20240608151842-d3f834017e53
 	github.com/yuin/goldmark v1.7.8
 	github.com/yuin/goldmark-highlighting/v2 v2.0.0-20230729083705-37449abec8cc
@@ -37,32 +37,33 @@ require (
 	go.uber.org/automaxprocs v1.6.0
 	go.uber.org/zap v1.27.0
 	go.uber.org/zap/exp v0.3.0
-	golang.org/x/crypto v0.31.0
+	golang.org/x/crypto v0.36.0
-	golang.org/x/crypto/x509roots/fallback v0.0.0-20241104001025-71ed71b4faf9
+	golang.org/x/crypto/x509roots/fallback v0.0.0-20250305170421-49bf5b80c810
-	golang.org/x/net v0.33.0
+	golang.org/x/net v0.38.0
-	golang.org/x/sync v0.10.0
+	golang.org/x/sync v0.12.0
-	golang.org/x/term v0.27.0
+	golang.org/x/term v0.30.0
-	golang.org/x/time v0.7.0
+	golang.org/x/time v0.11.0
 	gopkg.in/natefinch/lumberjack.v2 v2.2.1
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
+	cel.dev/expr v0.19.1 // indirect
 	dario.cat/mergo v1.0.1 // indirect
 	github.com/Microsoft/go-winio v0.6.0 // indirect
 	github.com/antlr4-go/antlr/v4 v4.13.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/francoispqt/gojay v1.2.13 // indirect
 	github.com/fxamacker/cbor/v2 v2.6.0 // indirect
-	github.com/go-jose/go-jose/v3 v3.0.3 // indirect
+	github.com/go-jose/go-jose/v3 v3.0.4 // indirect
 	github.com/go-kit/log v0.2.1 // indirect
-	github.com/golang/glog v1.2.2 // indirect
 	github.com/google/certificate-transparency-go v1.1.8-0.20240110162603-74a5dd331745 // indirect
 	github.com/google/go-tpm v0.9.0 // indirect
 	github.com/google/go-tspi v0.3.0 // indirect
 	github.com/google/pprof v0.0.0-20231212022811-ec68065c825e // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.22.0 // indirect
 	github.com/onsi/ginkgo/v2 v2.13.2 // indirect
+	github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/quic-go/qpack v0.5.1 // indirect
 	github.com/smallstep/go-attestation v0.4.4-0.20240109183208-413678f90935 // indirect
@@ -74,7 +75,7 @@ require (
 	go.opentelemetry.io/contrib/propagators/b3 v1.17.0 // indirect
 	go.opentelemetry.io/contrib/propagators/jaeger v1.17.0 // indirect
 	go.opentelemetry.io/contrib/propagators/ot v1.17.0 // indirect
-	go.uber.org/mock v0.4.0 // indirect
+	go.uber.org/mock v0.5.0 // indirect
 	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20241007155032-5fefd90f89a9 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20241007155032-5fefd90f89a9 // indirect
@@ -90,12 +91,12 @@ require (
 	github.com/cespare/xxhash v1.1.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0
 	github.com/chzyer/readline v1.5.1 // indirect
-	github.com/cpuguy83/go-md2man/v2 v2.0.4 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.6 // indirect
 	github.com/dgraph-io/badger v1.6.2 // indirect
 	github.com/dgraph-io/badger/v2 v2.2007.4 // indirect
-	github.com/dgraph-io/ristretto v0.1.0 // indirect
+	github.com/dgraph-io/ristretto v0.2.0 // indirect
 	github.com/dgryski/go-farm v0.0.0-20200201041132-a6ae2369ad13 // indirect
-	github.com/dlclark/regexp2 v1.11.0 // indirect
+	github.com/dlclark/regexp2 v1.11.4 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/go-kit/kit v0.13.0 // indirect
 	github.com/go-logfmt/logfmt v0.6.0 // indirect
@@ -115,18 +116,18 @@ require (
 	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
 	github.com/jackc/pgtype v1.14.0 // indirect
 	github.com/jackc/pgx/v4 v4.18.3 // indirect
-	github.com/libdns/libdns v0.2.2
+	github.com/libdns/libdns v1.0.0-beta.1
 	github.com/manifoldco/promptui v0.9.0 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d // indirect
-	github.com/miekg/dns v1.1.62 // indirect
+	github.com/miekg/dns v1.1.63 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/go-ps v1.0.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/pires/go-proxyproto v0.7.1-0.20240628150027-b718e7ce4964
 	github.com/pkg/errors v0.9.1 // indirect
-	github.com/prometheus/client_model v0.5.0 // indirect
+	github.com/prometheus/client_model v0.5.0
 	github.com/prometheus/common v0.48.0 // indirect
 	github.com/prometheus/procfs v0.12.0 // indirect
 	github.com/rs/xid v1.5.0 // indirect
@@ -147,10 +148,10 @@ require (
 	go.step.sm/crypto v0.45.0
 	go.step.sm/linkedca v0.20.1 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	golang.org/x/mod v0.18.0 // indirect
+	golang.org/x/mod v0.24.0 // indirect
-	golang.org/x/sys v0.28.0
+	golang.org/x/sys v0.31.0
-	golang.org/x/text v0.21.0 // indirect
+	golang.org/x/text v0.23.0 // indirect
-	golang.org/x/tools v0.22.0 // indirect
+	golang.org/x/tools v0.31.0 // indirect
 	google.golang.org/grpc v1.67.1 // indirect
 	google.golang.org/protobuf v1.35.1 // indirect
 	howett.net/plist v1.0.0 // indirect

go.sum

@@ -1,3 +1,5 @@
+cel.dev/expr v0.19.1 h1:NciYrtDRIR0lNCnH1LFJegdjspNx9fI59O7TWcua/W4=
+cel.dev/expr v0.19.1/go.mod h1:MrpN08Q+lEBs+bGYdLxxHkZoUSsCp0nSKTs0nTymJgw=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.31.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
@@ -31,6 +33,8 @@ github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03
 github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/BurntSushi/toml v1.4.0 h1:kuoIxZQy2WRRk1pttg9asf+WVv6tWQuBNVmK8+nqPr0=
 github.com/BurntSushi/toml v1.4.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
+github.com/KimMachineGun/automemlimit v0.7.1 h1:QcG/0iCOLChjfUweIMC3YL5Xy9C3VBeNmCZHrZfJMBw=
+github.com/KimMachineGun/automemlimit v0.7.1/go.mod h1:QZxpHaGOQoYvFhv/r4u3U0JTC2ZcOwbSr11UZF46UBM=
 github.com/Masterminds/goutils v1.1.1 h1:5nUrii3FMTL5diU80unEVvNevw1nH4+ZV4DSLVJLSYI=
 github.com/Masterminds/goutils v1.1.1/go.mod h1:8cTjp+g8YejhMuvIA5y2vz3BpJxksy863GQaJW2MFNU=
 github.com/Masterminds/semver/v3 v3.1.1/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
@@ -42,11 +46,11 @@ github.com/Microsoft/go-winio v0.6.0 h1:slsWYD/zyx7lCXoZVlvQrj0hPTM1HI4+v1sIda2y
 github.com/Microsoft/go-winio v0.6.0/go.mod h1:cTAf44im0RAYeL23bpB+fzCyDH2MJiz2BO69KH/soAE=
 github.com/OneOfOne/xxhash v1.2.2 h1:KMrpdQIwFcEqXDklaen+P1axHaj9BSKzvpUUfnHldSE=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
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@@ -120,8 +125,8 @@ github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7
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@@ -132,15 +137,15 @@ github.com/dgraph-io/badger/v2 v2.2007.4 h1:TRWBQg8UrlUhaFdco01nO2uXwzKS7zd+HVdw
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@@ -186,8 +191,6 @@ github.com/gofrs/uuid v4.0.0+incompatible h1:1SD/1F5pU8p29ybwgQSwpQk+mwdRrXCYuPh
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@@ -302,10 +305,10 @@ github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCV
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@@ -344,11 +347,11 @@ github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d h1:5PJl274Y63IEHC+7izoQE9x6ikvDFZS2mDVS3drnohI=
 github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d/go.mod h1:01TrycV0kFyexm33Z7vhZRXopbI8J3TDReVlkTgMUxE=
-github.com/mholt/acmez/v3 v3.0.0 h1:r1NcjuWR0VaKP2BTjDK9LRFBw/WvURx3jlaEUl9Ht8E=
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-github.com/mholt/acmez/v3 v3.0.0/go.mod h1:L1wOU06KKvq7tswuMDwKdcHeKpFFgkppZy/y0DFxagQ=
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-github.com/miekg/dns v1.1.62 h1:cN8OuEF1/x5Rq6Np+h1epln8OiyPWV+lROx9LxcGgIQ=
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-github.com/miekg/dns v1.1.62/go.mod h1:mvDlcItzm+br7MToIKqkglaGhlFMHJ9DTNNWONWXbNQ=
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@@ -366,6 +369,8 @@ github.com/onsi/ginkgo/v2 v2.13.2/go.mod h1:XStQ8QcGwLyF4HdfcZB8SFOS/MWCgDuXMSBe
 github.com/onsi/gomega v1.29.0 h1:KIA/t2t5UBzoirT4H9tsML45GEbo3ouUnBHsCfD2tVg=
 github.com/onsi/gomega v1.29.0/go.mod h1:9sxs+SwGrKI0+PWe4Fxa9tFQQBG5xSsSbMXOI8PPpoQ=
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+github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 h1:onHthvaw9LFnH4t2DcNVpwGmV9E1BkGknEliJkfwQj0=
+github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58/go.mod h1:DXv8WO4yhMYhSNPKjeNKa5WY9YCIEBRbNzFFPJbWO6Y=
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
 github.com/peterbourgon/diskv/v3 v3.0.1 h1:x06SQA46+PKIUftmEujdwSEpIx8kR+M9eLYsUxeYveU=
 github.com/peterbourgon/diskv/v3 v3.0.1/go.mod h1:kJ5Ny7vLdARGU3WUuy6uzO6T0nb/2gWcT1JiBvRmb5o=
@@ -392,8 +397,8 @@ github.com/prometheus/procfs v0.12.0 h1:jluTpSng7V9hY0O2R9DzzJHYb2xULk9VTR1V1R/k
 github.com/prometheus/procfs v0.12.0/go.mod h1:pcuDEFsWDnvcgNzo4EEweacyhjeA9Zk3cnaOZAZEfOo=
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 github.com/quic-go/qpack v0.5.1/go.mod h1:+PC4XFrEskIVkcLzpEkbLqq1uCoxPhQuvK5rH1ZgaEg=
-github.com/quic-go/quic-go v0.48.2 h1:wsKXZPeGWpMpCGSWqOcqpW2wZYic/8T3aqiOID0/KWE=
+github.com/quic-go/quic-go v0.51.0 h1:K8exxe9zXxeRKxaXxi/GpUqYiTrtdiWP8bo1KFya6Wc=
-github.com/quic-go/quic-go v0.48.2/go.mod h1:yBgs3rWBOADpga7F+jJsb6Ybg1LSYiQvwWlLX+/6HMs=
+github.com/quic-go/quic-go v0.51.0/go.mod h1:MFlGGpcpJqRAfmYi6NC2cptDPSxRWTOGNuP4wqrWmzQ=
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@@ -468,12 +473,12 @@ github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkU
 github.com/spf13/cast v1.7.0 h1:ntdiHjuueXFgm5nzDRdOS4yfT43P5Fnud6DH50rz/7w=
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-github.com/spf13/cobra v1.8.1 h1:e5/vxKd/rZsfSJMUX1agtjeTDf+qv1/JdBF8gg5k9ZM=
+github.com/spf13/cobra v1.9.1 h1:CXSaggrXdbHK9CF+8ywj8Amf7PBRmPCOJugH954Nnlo=
-github.com/spf13/cobra v1.8.1/go.mod h1:wHxEcudfqmLYa8iTfL+OuZPbBZkmvliBWKIezN3kD9Y=
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-github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=
-github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
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@@ -491,8 +496,8 @@ github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
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-github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
-github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/tailscale/tscert v0.0.0-20240608151842-d3f834017e53 h1:uxMgm0C+EjytfAqyfBG55ZONKQ7mvd7x4YYCWsf8QHQ=
 github.com/tailscale/tscert v0.0.0-20240608151842-d3f834017e53/go.mod h1:kNGUQ3VESx3VZwRwA9MSCUegIl6+saPL8Noq82ozCaU=
 github.com/tarm/serial v0.0.0-20180830185346-98f6abe2eb07/go.mod h1:kDXzergiv9cbyO7IOYJZWg1U88JhDg3PB6klq9Hg2pA=
@@ -564,8 +569,8 @@ go.uber.org/automaxprocs v1.6.0 h1:O3y2/QNTOdbF+e/dpXNNW7Rx2hZ4sTIPyybbxyNqTUs=
 go.uber.org/automaxprocs v1.6.0/go.mod h1:ifeIMSnPZuznNm6jmdzmU3/bfk01Fe2fotchwEFJ8r8=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
-go.uber.org/mock v0.4.0 h1:VcM4ZOtdbR4f6VXfiOpwpVJDL6lCReaZ6mw31wqh7KU=
+go.uber.org/mock v0.5.0 h1:KAMbZvZPyBPWgD14IrIQ38QCyjwpvVVV6K/bHl1IwQU=
-go.uber.org/mock v0.4.0/go.mod h1:a6FSlNadKUHUa9IP5Vyt1zh4fC7uAwxMutEAscFbkZc=
+go.uber.org/mock v0.5.0/go.mod h1:ge71pBPLYDk7QIi1LupWxdAykm7KIEFchiOqd6z7qMM=
 go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
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@@ -595,10 +600,10 @@ golang.org/x/crypto v0.0.0-20210616213533-5ff15b29337e/go.mod h1:GvvjBRRGRdwPK5y
 golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU=
-golang.org/x/crypto v0.31.0 h1:ihbySMvVjLAeSH1IbfcRTkD/iNscyz8rGzjF/E5hV6U=
+golang.org/x/crypto v0.36.0 h1:AnAEvhDddvBdpY+uR+MyHmuZzzNqXSe/GvuDeob5L34=
-golang.org/x/crypto v0.31.0/go.mod h1:kDsLvtWBEx7MV9tJOj9bnXsPbxwJQ6csT/x4KIN4Ssk=
+golang.org/x/crypto v0.36.0/go.mod h1:Y4J0ReaxCR1IMaabaSMugxJES1EpwhBHhv2bDHklZvc=
-golang.org/x/crypto/x509roots/fallback v0.0.0-20241104001025-71ed71b4faf9 h1:4cEcP5+OjGppY79LCQ5Go2B1Boix2x0v6pvA01P3FoA=
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-golang.org/x/crypto/x509roots/fallback v0.0.0-20241104001025-71ed71b4faf9/go.mod h1:kNa9WdvYnzFwC79zRpLRMJbdEFlhyM5RPFBBZp/wWH8=
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 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 h1:vr/HnozRka3pE4EsMEg1lgkXJkTFJCVUX+S/ZT6wYzM=
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@@ -610,8 +615,8 @@ golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKG
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
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-golang.org/x/mod v0.18.0 h1:5+9lSbEzPSdWkH32vYPBwEpX8KwDbM52Ud9xBUvNlb0=
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-golang.org/x/mod v0.18.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/mod v0.24.0/go.mod h1:IXM97Txy2VM4PJ3gI61r1YEk/gAj6zAHN3AdZt6S9Ww=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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@@ -628,8 +633,8 @@ golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
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-golang.org/x/net v0.33.0 h1:74SYHlV8BIgHIFC/LrYkOGIwL19eTYXQ5wc6TBuO36I=
+golang.org/x/net v0.38.0 h1:vRMAPTMaeGqVhG5QyLJHqNDwecKTomGeqbnfZyKlBI8=
-golang.org/x/net v0.33.0/go.mod h1:HXLR5J+9DxmrqMwG9qjGCxZ+zKXxBru04zlTvWlWuN4=
+golang.org/x/net v0.38.0/go.mod h1:ivrbrMbzFq5J41QOQh0siUuly180yBYtLp+CKbEaFx8=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181017192945-9dcd33a902f4/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181203162652-d668ce993890/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
@@ -644,8 +649,8 @@ golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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-golang.org/x/sync v0.10.0 h1:3NQrjDixjgGwUOCaF8w2+VYHv0Ve/vGYSbdkTa98gmQ=
+golang.org/x/sync v0.12.0 h1:MHc5BpPuC30uJk597Ri8TV3CNZcTLu6B6z4lJy+g6Jw=
-golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sync v0.12.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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@@ -663,7 +668,6 @@ golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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-golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220310020820-b874c991c1a5/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -675,16 +679,16 @@ golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.28.0 h1:Fksou7UEQUWlKvIdsqzJmUmCX3cZuD2+P3XyyzwMhlA=
+golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
-golang.org/x/sys v0.28.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
 golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
 golang.org/x/term v0.17.0/go.mod h1:lLRBjIVuehSbZlaOtGMbcMncT+aqLLLmKrsjNrUguwk=
-golang.org/x/term v0.27.0 h1:WP60Sv1nlK1T6SupCHbXzSaN0b9wUmsPoRS9b61A23Q=
+golang.org/x/term v0.30.0 h1:PQ39fJZ+mfadBm0y5WlL4vlM7Sx1Hgf13sMIY2+QS9Y=
-golang.org/x/term v0.27.0/go.mod h1:iMsnZpn0cago0GOrHO2+Y7u7JPn5AylBrcoWkElMTSM=
+golang.org/x/term v0.30.0/go.mod h1:NYYFdzHoI5wRh/h5tDMdMqCqPJZEuNqVR5xJLd/n67g=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
@@ -695,12 +699,12 @@ golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
-golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
+golang.org/x/text v0.23.0 h1:D71I7dUrlY+VX0gQShAThNGHFxZ13dGLBHQLVl1mJlY=
-golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
+golang.org/x/text v0.23.0/go.mod h1:/BLNzu4aZCJ1+kcD0DNRotWKage4q2rGVAg4o22unh4=
 golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
-golang.org/x/time v0.7.0 h1:ntUhktv3OPE6TgYxXWv9vKvUSJyIFJlyohwbkEwPrKQ=
+golang.org/x/time v0.11.0 h1:/bpjEDfN9tkoN/ryeYHnv5hcMlc8ncjMcM4XBk5NWV0=
-golang.org/x/time v0.7.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
+golang.org/x/time v0.11.0/go.mod h1:CDIdPxbZBQxdj6cxyCIdrNogrJKMJ7pr37NYpMcMDSg=
 golang.org/x/tools v0.0.0-20180828015842-6cd1fcedba52/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20181030000716-a0a13e073c7b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
@@ -716,8 +720,8 @@ golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtn
 golang.org/x/tools v0.0.0-20200103221440-774c71fcf114/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
-golang.org/x/tools v0.22.0 h1:gqSGLZqv+AI9lIQzniJ0nZDRG5GBPsSi+DRNHWNz6yA=
+golang.org/x/tools v0.31.0 h1:0EedkvKDbh+qistFTd0Bcwe/YLh4vHwWEkiI0toFIBU=
-golang.org/x/tools v0.22.0/go.mod h1:aCwcsjqvq7Yqt6TNyX7QMU2enbQ/Gt0bo6krSeEri+c=
+golang.org/x/tools v0.31.0/go.mod h1:naFTU+Cev749tSJRXJlna0T3WxKvb1kWEx15xA4SdmQ=
 golang.org/x/xerrors v0.0.0-20190410155217-1f06c39b4373/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

internal/filesystems/map.go

@@ -7,10 +7,10 @@ import (
 )
 
 const (
-	DefaultFilesystemKey = "default"
+	DefaultFileSystemKey = "default"
 )
 
-var DefaultFilesystem = &wrapperFs{key: DefaultFilesystemKey, FS: OsFS{}}
+var DefaultFileSystem = &wrapperFs{key: DefaultFileSystemKey, FS: OsFS{}}
 
 // wrapperFs exists so can easily add to wrapperFs down the line
 type wrapperFs struct {
@@ -18,24 +18,24 @@ type wrapperFs struct {
 	fs.FS
 }
 
-// FilesystemMap stores a map of filesystems
+// FileSystemMap stores a map of filesystems
 // the empty key will be overwritten to be the default key
 // it includes a default filesystem, based off the os fs
-type FilesystemMap struct {
+type FileSystemMap struct {
 	m sync.Map
 }
 
 // note that the first invocation of key cannot be called in a racy context.
-func (f *FilesystemMap) key(k string) string {
+func (f *FileSystemMap) key(k string) string {
 	if k == "" {
-		k = DefaultFilesystemKey
+		k = DefaultFileSystemKey
 	}
 	return k
 }
 
 // Register will add the filesystem with key to later be retrieved
 // A call with a nil fs will call unregister, ensuring that a call to Default() will never be nil
-func (f *FilesystemMap) Register(k string, v fs.FS) {
+func (f *FileSystemMap) Register(k string, v fs.FS) {
 	k = f.key(k)
 	if v == nil {
 		f.Unregister(k)
@@ -47,23 +47,23 @@ func (f *FilesystemMap) Register(k string, v fs.FS) {
 // Unregister will remove the filesystem with key from the filesystem map
 // if the key is the default key, it will set the default to the osFS instead of deleting it
 // modules should call this on cleanup to be safe
-func (f *FilesystemMap) Unregister(k string) {
+func (f *FileSystemMap) Unregister(k string) {
 	k = f.key(k)
-	if k == DefaultFilesystemKey {
+	if k == DefaultFileSystemKey {
-		f.m.Store(k, DefaultFilesystem)
+		f.m.Store(k, DefaultFileSystem)
 	} else {
 		f.m.Delete(k)
 	}
 }
 
 // Get will get a filesystem with a given key
-func (f *FilesystemMap) Get(k string) (v fs.FS, ok bool) {
+func (f *FileSystemMap) Get(k string) (v fs.FS, ok bool) {
 	k = f.key(k)
 	c, ok := f.m.Load(strings.TrimSpace(k))
 	if !ok {
-		if k == DefaultFilesystemKey {
+		if k == DefaultFileSystemKey {
-			f.m.Store(k, DefaultFilesystem)
+			f.m.Store(k, DefaultFileSystem)
-			return DefaultFilesystem, true
+			return DefaultFileSystem, true
 		}
 		return nil, ok
 	}
@@ -71,7 +71,7 @@ func (f *FilesystemMap) Get(k string) (v fs.FS, ok bool) {
 }
 
 // Default will get the default filesystem in the filesystem map
-func (f *FilesystemMap) Default() fs.FS {
+func (f *FileSystemMap) Default() fs.FS {
-	val, _ := f.Get(DefaultFilesystemKey)
+	val, _ := f.Get(DefaultFileSystemKey)
 	return val
 }

internal/logs.go

@@ -0,0 +1,22 @@
+package internal
+
+import "fmt"
+
+// MaxSizeSubjectsListForLog returns the keys in the map as a slice of maximum length
+// maxToDisplay. It is useful for logging domains being managed, for example, since a
+// map is typically needed for quick lookup, but a slice is needed for logging, and this
+// can be quite a doozy since there may be a huge amount (hundreds of thousands).
+func MaxSizeSubjectsListForLog(subjects map[string]struct{}, maxToDisplay int) []string {
+	numberOfNamesToDisplay := min(len(subjects), maxToDisplay)
+	domainsToDisplay := make([]string, 0, numberOfNamesToDisplay)
+	for domain := range subjects {
+		domainsToDisplay = append(domainsToDisplay, domain)
+		if len(domainsToDisplay) >= numberOfNamesToDisplay {
+			break
+		}
+	}
+	if len(subjects) > maxToDisplay {
+		domainsToDisplay = append(domainsToDisplay, fmt.Sprintf("(and %d more...)", len(subjects)-maxToDisplay))
+	}
+	return domainsToDisplay
+}

listeners.go

@@ -210,7 +210,7 @@ func (na NetworkAddress) IsUnixNetwork() bool {
 	return IsUnixNetwork(na.Network)
 }
 
-// IsUnixNetwork returns true if na.Network is
+// IsFdNetwork returns true if na.Network is
 // fd or fdgram.
 func (na NetworkAddress) IsFdNetwork() bool {
 	return IsFdNetwork(na.Network)
@@ -641,7 +641,7 @@ func RegisterNetwork(network string, getListener ListenerFunc) {
 	if network == "tcp" || network == "tcp4" || network == "tcp6" ||
 		network == "udp" || network == "udp4" || network == "udp6" ||
 		network == "unix" || network == "unixpacket" || network == "unixgram" ||
-		strings.HasPrefix("ip:", network) || strings.HasPrefix("ip4:", network) || strings.HasPrefix("ip6:", network) ||
+		strings.HasPrefix(network, "ip:") || strings.HasPrefix(network, "ip4:") || strings.HasPrefix(network, "ip6:") ||
 		network == "fd" || network == "fdgram" {
 		panic("network type " + network + " is reserved")
 	}

logging.go

@@ -20,6 +20,7 @@ import (
 	"io"
 	"log"
 	"os"
+	"slices"
 	"strings"
 	"sync"
 	"time"
@@ -161,7 +162,9 @@ func (logging *Logging) setupNewDefault(ctx Context) error {
 	if err != nil {
 		return fmt.Errorf("setting up default log: %v", err)
 	}
-	newDefault.logger = zap.New(newDefault.CustomLog.core, options...)
+
+	filteringCore := &filteringCore{newDefault.CustomLog.core, newDefault.CustomLog}
+	newDefault.logger = zap.New(filteringCore, options...)
 
 	// redirect the default caddy logs
 	defaultLoggerMu.Lock()
@@ -490,10 +493,8 @@ func (cl *CustomLog) provision(ctx Context, logging *Logging) error {
 	if len(cl.Include) > 0 && len(cl.Exclude) > 0 {
 		// prevent intersections
 		for _, allow := range cl.Include {
-			for _, deny := range cl.Exclude {
+			if slices.Contains(cl.Exclude, allow) {
-				if allow == deny {
+				return fmt.Errorf("include and exclude must not intersect, but found %s in both lists", allow)
-					return fmt.Errorf("include and exclude must not intersect, but found %s in both lists", allow)
-				}
 			}
 		}
 

logging_test.go

@@ -0,0 +1,106 @@
+// Copyright 2015 Matthew Holt and The Caddy Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package caddy
+
+import "testing"
+
+func TestCustomLog_loggerAllowed(t *testing.T) {
+	type fields struct {
+		BaseLog BaseLog
+		Include []string
+		Exclude []string
+	}
+	type args struct {
+		name     string
+		isModule bool
+	}
+	tests := []struct {
+		name   string
+		fields fields
+		args   args
+		want   bool
+	}{
+		{
+			name: "include",
+			fields: fields{
+				Include: []string{"foo"},
+			},
+			args: args{
+				name:     "foo",
+				isModule: true,
+			},
+			want: true,
+		},
+		{
+			name: "exclude",
+			fields: fields{
+				Exclude: []string{"foo"},
+			},
+			args: args{
+				name:     "foo",
+				isModule: true,
+			},
+			want: false,
+		},
+		{
+			name: "include and exclude",
+			fields: fields{
+				Include: []string{"foo"},
+				Exclude: []string{"foo"},
+			},
+			args: args{
+				name:     "foo",
+				isModule: true,
+			},
+			want: false,
+		},
+		{
+			name: "include and exclude (longer namespace)",
+			fields: fields{
+				Include: []string{"foo.bar"},
+				Exclude: []string{"foo"},
+			},
+			args: args{
+				name:     "foo.bar",
+				isModule: true,
+			},
+			want: true,
+		},
+		{
+			name: "excluded module is not printed",
+			fields: fields{
+				Include: []string{"admin.api.load"},
+				Exclude: []string{"admin.api"},
+			},
+			args: args{
+				name:     "admin.api",
+				isModule: false,
+			},
+			want: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cl := &CustomLog{
+				BaseLog: tt.fields.BaseLog,
+				Include: tt.fields.Include,
+				Exclude: tt.fields.Exclude,
+			}
+			if got := cl.loggerAllowed(tt.args.name, tt.args.isModule); got != tt.want {
+				t.Errorf("CustomLog.loggerAllowed() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

modules.go

@@ -18,6 +18,8 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"net/http"
+	"net/url"
 	"reflect"
 	"sort"
 	"strings"
@@ -360,6 +362,14 @@ func isModuleMapType(typ reflect.Type) bool {
 		isJSONRawMessage(typ.Elem())
 }
 
+// ProxyFuncProducer is implemented by modules which produce a
+// function that returns a URL to use as network proxy. Modules
+// in the namespace `caddy.network_proxy` must implement this
+// interface.
+type ProxyFuncProducer interface {
+	ProxyFunc() func(*http.Request) (*url.URL, error)
+}
+
 var (
 	modules   = make(map[string]ModuleInfo)
 	modulesMu sync.RWMutex

modules/caddyevents/app.go

@@ -20,9 +20,7 @@ import (
 	"errors"
 	"fmt"
 	"strings"
-	"time"
 
-	"github.com/google/uuid"
 	"go.uber.org/zap"
 
 	"github.com/caddyserver/caddy/v2"
@@ -206,27 +204,26 @@ func (app *App) On(eventName string, handler Handler) error {
 //
 // Note that the data map is not copied, for efficiency. After Emit() is called, the
 // data passed in should not be changed in other goroutines.
-func (app *App) Emit(ctx caddy.Context, eventName string, data map[string]any) Event {
+func (app *App) Emit(ctx caddy.Context, eventName string, data map[string]any) caddy.Event {
 	logger := app.logger.With(zap.String("name", eventName))
 
-	id, err := uuid.NewRandom()
+	e, err := caddy.NewEvent(ctx, eventName, data)
 	if err != nil {
-		logger.Error("failed generating new event ID", zap.Error(err))
+		logger.Error("failed to create event", zap.Error(err))
 	}
 
-	eventName = strings.ToLower(eventName)
+	var originModule caddy.ModuleInfo
-
+	var originModuleID caddy.ModuleID
-	e := Event{
+	var originModuleName string
-		Data:   data,
+	if origin := e.Origin(); origin != nil {
-		id:     id,
+		originModule = origin.CaddyModule()
-		ts:     time.Now(),
+		originModuleID = originModule.ID
-		name:   eventName,
+		originModuleName = originModule.String()
-		origin: ctx.Module(),
 	}
 
 	logger = logger.With(
-		zap.String("id", e.id.String()),
+		zap.String("id", e.ID().String()),
-		zap.String("origin", e.origin.CaddyModule().String()))
+		zap.String("origin", originModuleName))
 
 	// add event info to replacer, make sure it's in the context
 	repl, ok := ctx.Context.Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
@@ -239,15 +236,15 @@ func (app *App) Emit(ctx caddy.Context, eventName string, data map[string]any) E
 		case "event":
 			return e, true
 		case "event.id":
-			return e.id, true
+			return e.ID(), true
 		case "event.name":
-			return e.name, true
+			return e.Name(), true
 		case "event.time":
-			return e.ts, true
+			return e.Timestamp(), true
 		case "event.time_unix":
-			return e.ts.UnixMilli(), true
+			return e.Timestamp().UnixMilli(), true
 		case "event.module":
-			return e.origin.CaddyModule().ID, true
+			return originModuleID, true
 		case "event.data":
 			return e.Data, true
 		}
@@ -269,7 +266,7 @@ func (app *App) Emit(ctx caddy.Context, eventName string, data map[string]any) E
 	// invoke handlers bound to the event by name and also all events; this for loop
 	// iterates twice at most: once for the event name, once for "" (all events)
 	for {
-		moduleID := e.origin.CaddyModule().ID
+		moduleID := originModuleID
 
 		// implement propagation up the module tree (i.e. start with "a.b.c" then "a.b" then "a" then "")
 		for {
@@ -292,7 +289,7 @@ func (app *App) Emit(ctx caddy.Context, eventName string, data map[string]any) E
 					zap.Any("handler", handler))
 
 				if err := handler.Handle(ctx, e); err != nil {
-					aborted := errors.Is(err, ErrAborted)
+					aborted := errors.Is(err, caddy.ErrEventAborted)
 
 					logger.Error("handler error",
 						zap.Error(err),
@@ -326,76 +323,9 @@ func (app *App) Emit(ctx caddy.Context, eventName string, data map[string]any) E
 	return e
 }
 
-// Event represents something that has happened or is happening.
-// An Event value is not synchronized, so it should be copied if
-// being used in goroutines.
-//
-// EXPERIMENTAL: As with the rest of this package, events are
-// subject to change.
-type Event struct {
-	// If non-nil, the event has been aborted, meaning
-	// propagation has stopped to other handlers and
-	// the code should stop what it was doing. Emitters
-	// may choose to use this as a signal to adjust their
-	// code path appropriately.
-	Aborted error
-
-	// The data associated with the event. Usually the
-	// original emitter will be the only one to set or
-	// change these values, but the field is exported
-	// so handlers can have full access if needed.
-	// However, this map is not synchronized, so
-	// handlers must not use this map directly in new
-	// goroutines; instead, copy the map to use it in a
-	// goroutine.
-	Data map[string]any
-
-	id     uuid.UUID
-	ts     time.Time
-	name   string
-	origin caddy.Module
-}
-
-func (e Event) ID() uuid.UUID        { return e.id }
-func (e Event) Timestamp() time.Time { return e.ts }
-func (e Event) Name() string         { return e.name }
-func (e Event) Origin() caddy.Module { return e.origin }
-
-// CloudEvent exports event e as a structure that, when
-// serialized as JSON, is compatible with the
-// CloudEvents spec.
-func (e Event) CloudEvent() CloudEvent {
-	dataJSON, _ := json.Marshal(e.Data)
-	return CloudEvent{
-		ID:              e.id.String(),
-		Source:          e.origin.CaddyModule().String(),
-		SpecVersion:     "1.0",
-		Type:            e.name,
-		Time:            e.ts,
-		DataContentType: "application/json",
-		Data:            dataJSON,
-	}
-}
-
-// CloudEvent is a JSON-serializable structure that
-// is compatible with the CloudEvents specification.
-// See https://cloudevents.io.
-type CloudEvent struct {
-	ID              string          `json:"id"`
-	Source          string          `json:"source"`
-	SpecVersion     string          `json:"specversion"`
-	Type            string          `json:"type"`
-	Time            time.Time       `json:"time"`
-	DataContentType string          `json:"datacontenttype,omitempty"`
-	Data            json.RawMessage `json:"data,omitempty"`
-}
-
-// ErrAborted cancels an event.
-var ErrAborted = errors.New("event aborted")
-
 // Handler is a type that can handle events.
 type Handler interface {
-	Handle(context.Context, Event) error
+	Handle(context.Context, caddy.Event) error
 }
 
 // Interface guards

modules/caddyfs/filesystem.go

@@ -69,11 +69,11 @@ func (xs *Filesystems) Provision(ctx caddy.Context) error {
 		}
 		// register that module
 		ctx.Logger().Debug("registering fs", zap.String("fs", f.Key))
-		ctx.Filesystems().Register(f.Key, f.fileSystem)
+		ctx.FileSystems().Register(f.Key, f.fileSystem)
 		// remember to unregister the module when we are done
 		xs.defers = append(xs.defers, func() {
 			ctx.Logger().Debug("unregistering fs", zap.String("fs", f.Key))
-			ctx.Filesystems().Unregister(f.Key)
+			ctx.FileSystems().Unregister(f.Key)
 		})
 	}
 	return nil

modules/caddyhttp/app.go

@@ -73,7 +73,7 @@ func init() {
 // `{http.request.local.host}` | The host (IP) part of the local address the connection arrived on
 // `{http.request.local.port}` | The port part of the local address the connection arrived on
 // `{http.request.local}` | The local address the connection arrived on
-// `{http.request.remote.host}` | The host (IP) part of the remote client's address
+// `{http.request.remote.host}` | The host (IP) part of the remote client's address, if available (not known with HTTP/3 early data)
 // `{http.request.remote.port}` | The port part of the remote client's address
 // `{http.request.remote}` | The address of the remote client
 // `{http.request.scheme}` | The request scheme, typically `http` or `https`
@@ -152,7 +152,7 @@ type App struct {
 	tlsApp *caddytls.TLS
 
 	// used temporarily between phases 1 and 2 of auto HTTPS
-	allCertDomains []string
+	allCertDomains map[string]struct{}
 }
 
 // CaddyModule returns the Caddy module information.
@@ -207,7 +207,7 @@ func (app *App) Provision(ctx caddy.Context) error {
 
 		if srv.Metrics != nil {
 			srv.logger.Warn("per-server 'metrics' is deprecated; use 'metrics' in the root 'http' app instead")
-			app.Metrics = cmp.Or[*Metrics](app.Metrics, &Metrics{
+			app.Metrics = cmp.Or(app.Metrics, &Metrics{
 				init:        sync.Once{},
 				httpMetrics: &httpMetrics{},
 			})

modules/caddyhttp/autohttps.go

@@ -25,6 +25,7 @@ import (
 	"go.uber.org/zap"
 
 	"github.com/caddyserver/caddy/v2"
+	"github.com/caddyserver/caddy/v2/internal"
 	"github.com/caddyserver/caddy/v2/modules/caddytls"
 )
 
@@ -65,12 +66,6 @@ type AutoHTTPSConfig struct {
 	// enabled. To force automated certificate management
 	// regardless of loaded certificates, set this to true.
 	IgnoreLoadedCerts bool `json:"ignore_loaded_certificates,omitempty"`
-
-	// If true, automatic HTTPS will prefer wildcard names
-	// and ignore non-wildcard names if both are available.
-	// This allows for writing a config with top-level host
-	// matchers without having those names produce certificates.
-	PreferWildcard bool `json:"prefer_wildcard,omitempty"`
 }
 
 // automaticHTTPSPhase1 provisions all route matchers, determines
@@ -163,26 +158,13 @@ func (app *App) automaticHTTPSPhase1(ctx caddy.Context, repl *caddy.Replacer) er
 			}
 		}
 
-		if srv.AutoHTTPS.PreferWildcard {
+		// build the list of domains that could be used with ECH (if enabled)
-			wildcards := make(map[string]struct{})
+		// so the TLS app can know to publish ECH configs for them
-			for d := range serverDomainSet {
+		echDomains := make([]string, 0, len(serverDomainSet))
-				if strings.HasPrefix(d, "*.") {
+		for d := range serverDomainSet {
-					wildcards[d[2:]] = struct{}{}
+			echDomains = append(echDomains, d)
-				}
-			}
-			for d := range serverDomainSet {
-				if strings.HasPrefix(d, "*.") {
-					continue
-				}
-				base := d
-				if idx := strings.Index(d, "."); idx != -1 {
-					base = d[idx+1:]
-				}
-				if _, ok := wildcards[base]; ok {
-					delete(serverDomainSet, d)
-				}
-			}
 		}
+		app.tlsApp.RegisterServerNames(echDomains)
 
 		// nothing more to do here if there are no domains that qualify for
 		// automatic HTTPS and there are no explicit TLS connection policies:
@@ -283,19 +265,10 @@ func (app *App) automaticHTTPSPhase1(ctx caddy.Context, repl *caddy.Replacer) er
 		}
 	}
 
-	// we now have a list of all the unique names for which we need certs;
+	// we now have a list of all the unique names for which we need certs
-	// turn the set into a slice so that phase 2 can use it
-	app.allCertDomains = make([]string, 0, len(uniqueDomainsForCerts))
 	var internal, tailscale []string
 uniqueDomainsLoop:
 	for d := range uniqueDomainsForCerts {
-		if !isTailscaleDomain(d) {
-			// whether or not there is already an automation policy for this
-			// name, we should add it to the list to manage a cert for it,
-			// unless it's a Tailscale domain, because we don't manage those
-			app.allCertDomains = append(app.allCertDomains, d)
-		}
-
 		// some names we've found might already have automation policies
 		// explicitly specified for them; we should exclude those from
 		// our hidden/implicit policy, since applying a name to more than
@@ -334,6 +307,7 @@ uniqueDomainsLoop:
 		}
 		if isTailscaleDomain(d) {
 			tailscale = append(tailscale, d)
+			delete(uniqueDomainsForCerts, d) // not managed by us; handled separately
 		} else if shouldUseInternal(d) {
 			internal = append(internal, d)
 		}
@@ -463,6 +437,9 @@ redirServersLoop:
 		}
 	}
 
+	// persist the domains/IPs we're managing certs for through provisioning/startup
+	app.allCertDomains = uniqueDomainsForCerts
+
 	logger.Debug("adjusted config",
 		zap.Reflect("tls", app.tlsApp),
 		zap.Reflect("http", app))
@@ -765,7 +742,7 @@ func (app *App) automaticHTTPSPhase2() error {
 		return nil
 	}
 	app.logger.Info("enabling automatic TLS certificate management",
-		zap.Strings("domains", app.allCertDomains),
+		zap.Strings("domains", internal.MaxSizeSubjectsListForLog(app.allCertDomains, 1000)),
 	)
 	err := app.tlsApp.Manage(app.allCertDomains)
 	if err != nil {

modules/caddyhttp/caddyauth/caddyauth.go

@@ -37,6 +37,10 @@ func init() {
 // `{http.auth.user.*}` placeholders may be set for any authentication
 // modules that provide user metadata.
 //
+// In case of an error, the placeholder `{http.auth.<provider>.error}`
+// will be set to the error message returned by the authentication
+// provider.
+//
 // Its API is still experimental and may be subject to change.
 type Authentication struct {
 	// A set of authentication providers. If none are specified,
@@ -71,6 +75,7 @@ func (a *Authentication) Provision(ctx caddy.Context) error {
 }
 
 func (a Authentication) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
+	repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
 	var user User
 	var authed bool
 	var err error
@@ -80,6 +85,9 @@ func (a Authentication) ServeHTTP(w http.ResponseWriter, r *http.Request, next c
 			if c := a.logger.Check(zapcore.ErrorLevel, "auth provider returned error"); c != nil {
 				c.Write(zap.String("provider", provName), zap.Error(err))
 			}
+			// Set the error from the authentication provider in a placeholder,
+			// so it can be used in the handle_errors directive.
+			repl.Set("http.auth."+provName+".error", err.Error())
 			continue
 		}
 		if authed {
@@ -90,7 +98,6 @@ func (a Authentication) ServeHTTP(w http.ResponseWriter, r *http.Request, next c
 		return caddyhttp.Error(http.StatusUnauthorized, fmt.Errorf("not authenticated"))
 	}
 
-	repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
 	repl.Set("http.auth.user.id", user.ID)
 	for k, v := range user.Metadata {
 		repl.Set("http.auth.user."+k, v)

modules/caddyhttp/fileserver/browse.go

@@ -130,9 +130,9 @@ func (fsrv *FileServer) serveBrowse(fileSystem fs.FS, root, dirPath string, w ht
 
 	// speed up browser/client experience and caching by supporting If-Modified-Since
 	if ifModSinceStr := r.Header.Get("If-Modified-Since"); ifModSinceStr != "" {
-		ifModSince, err := time.ParseInLocation(http.TimeFormat, ifModSinceStr, time.Local)
+		// basically a copy of stdlib file server's handling of If-Modified-Since
-		lastModTrunc := listing.lastModified.Truncate(time.Second)
+		ifModSince, err := http.ParseTime(ifModSinceStr)
-		if err == nil && (lastModTrunc.Equal(ifModSince) || lastModTrunc.Before(ifModSince)) {
+		if err == nil && listing.lastModified.Truncate(time.Second).Compare(ifModSince) <= 0 {
 			w.WriteHeader(http.StatusNotModified)
 			return nil
 		}
@@ -213,6 +213,11 @@ func (fsrv *FileServer) serveBrowse(fileSystem fs.FS, root, dirPath string, w ht
 }
 
 func (fsrv *FileServer) loadDirectoryContents(ctx context.Context, fileSystem fs.FS, dir fs.ReadDirFile, root, urlPath string, repl *caddy.Replacer) (*browseTemplateContext, error) {
+	// modTime for the directory itself
+	stat, err := dir.Stat()
+	if err != nil {
+		return nil, err
+	}
 	dirLimit := defaultDirEntryLimit
 	if fsrv.Browse.FileLimit != 0 {
 		dirLimit = fsrv.Browse.FileLimit
@@ -225,7 +230,7 @@ func (fsrv *FileServer) loadDirectoryContents(ctx context.Context, fileSystem fs
 	// user can presumably browse "up" to parent folder if path is longer than "/"
 	canGoUp := len(urlPath) > 1
 
-	return fsrv.directoryListing(ctx, fileSystem, files, canGoUp, root, urlPath, repl), nil
+	return fsrv.directoryListing(ctx, fileSystem, stat.ModTime(), files, canGoUp, root, urlPath, repl), nil
 }
 
 // browseApplyQueryParams applies query parameters to the listing.

modules/caddyhttp/fileserver/browse.html

@@ -26,7 +26,7 @@
 		<path d="M9 7l4 0"/>
 		<path d="M9 11l4 0"/>
 	</svg>
-	{{- else if .HasExt ".jpg" ".jpeg" ".png" ".gif" ".webp" ".tiff" ".bmp" ".heif" ".heic" ".svg"}}
+	{{- else if .HasExt ".jpg" ".jpeg" ".png" ".gif" ".webp" ".tiff" ".bmp" ".heif" ".heic" ".svg" ".avif"}}
 		{{- if eq .Tpl.Layout "grid"}}
 		<img loading="lazy" src="{{.Name | pathEscape}}">
 		{{- else}}

modules/caddyhttp/fileserver/browsetplcontext.go

@@ -35,15 +35,16 @@ import (
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
 )
 
-func (fsrv *FileServer) directoryListing(ctx context.Context, fileSystem fs.FS, entries []fs.DirEntry, canGoUp bool, root, urlPath string, repl *caddy.Replacer) *browseTemplateContext {
+func (fsrv *FileServer) directoryListing(ctx context.Context, fileSystem fs.FS, parentModTime time.Time, entries []fs.DirEntry, canGoUp bool, root, urlPath string, repl *caddy.Replacer) *browseTemplateContext {
 	filesToHide := fsrv.transformHidePaths(repl)
 
 	name, _ := url.PathUnescape(urlPath)
 
 	tplCtx := &browseTemplateContext{
-		Name:    path.Base(name),
+		Name:         path.Base(name),
-		Path:    urlPath,
+		Path:         urlPath,
-		CanGoUp: canGoUp,
+		CanGoUp:      canGoUp,
+		lastModified: parentModTime,
 	}
 
 	for _, entry := range entries {
@@ -131,6 +132,10 @@ func (fsrv *FileServer) directoryListing(ctx context.Context, fileSystem fs.FS,
 		})
 	}
 
+	// this time is used for the Last-Modified header and comparing If-Modified-Since from client
+	// both are expected to be in UTC, so we convert to UTC here
+	// see: https://github.com/caddyserver/caddy/issues/6828
+	tplCtx.lastModified = tplCtx.lastModified.UTC()
 	return tplCtx
 }
 

modules/caddyhttp/fileserver/matcher.go

@@ -274,7 +274,7 @@ func celFileMatcherMacroExpander() parser.MacroExpander {
 func (m *MatchFile) Provision(ctx caddy.Context) error {
 	m.logger = ctx.Logger()
 
-	m.fsmap = ctx.Filesystems()
+	m.fsmap = ctx.FileSystems()
 
 	if m.Root == "" {
 		m.Root = "{http.vars.root}"

modules/caddyhttp/fileserver/matcher_test.go

@@ -117,7 +117,7 @@ func TestFileMatcher(t *testing.T) {
 		},
 	} {
 		m := &MatchFile{
-			fsmap:    &filesystems.FilesystemMap{},
+			fsmap:    &filesystems.FileSystemMap{},
 			Root:     "./testdata",
 			TryFiles: []string{"{http.request.uri.path}", "{http.request.uri.path}/"},
 		}
@@ -229,7 +229,7 @@ func TestPHPFileMatcher(t *testing.T) {
 		},
 	} {
 		m := &MatchFile{
-			fsmap:     &filesystems.FilesystemMap{},
+			fsmap:     &filesystems.FileSystemMap{},
 			Root:      "./testdata",
 			TryFiles:  []string{"{http.request.uri.path}", "{http.request.uri.path}/index.php"},
 			SplitPath: []string{".php"},
@@ -273,7 +273,7 @@ func TestPHPFileMatcher(t *testing.T) {
 func TestFirstSplit(t *testing.T) {
 	m := MatchFile{
 		SplitPath: []string{".php"},
-		fsmap:     &filesystems.FilesystemMap{},
+		fsmap:     &filesystems.FileSystemMap{},
 	}
 	actual, remainder := m.firstSplit("index.PHP/somewhere")
 	expected := "index.PHP"

modules/caddyhttp/fileserver/staticfiles.go

@@ -186,7 +186,7 @@ func (FileServer) CaddyModule() caddy.ModuleInfo {
 func (fsrv *FileServer) Provision(ctx caddy.Context) error {
 	fsrv.logger = ctx.Logger()
 
-	fsrv.fsmap = ctx.Filesystems()
+	fsrv.fsmap = ctx.FileSystems()
 
 	if fsrv.FileSystem == "" {
 		fsrv.FileSystem = "{http.vars.fs}"
@@ -300,8 +300,10 @@ func (fsrv *FileServer) ServeHTTP(w http.ResponseWriter, r *http.Request, next c
 	info, err := fs.Stat(fileSystem, filename)
 	if err != nil {
 		err = fsrv.mapDirOpenError(fileSystem, err, filename)
-		if errors.Is(err, fs.ErrNotExist) || errors.Is(err, fs.ErrInvalid) {
+		if errors.Is(err, fs.ErrNotExist) {
 			return fsrv.notFound(w, r, next)
+		} else if errors.Is(err, fs.ErrInvalid) {
+			return caddyhttp.Error(http.StatusBadRequest, err)
 		} else if errors.Is(err, fs.ErrPermission) {
 			return caddyhttp.Error(http.StatusForbidden, err)
 		}
@@ -611,6 +613,11 @@ func (fsrv *FileServer) mapDirOpenError(fileSystem fs.FS, originalErr error, nam
 		return originalErr
 	}
 
+	var pathErr *fs.PathError
+	if errors.As(originalErr, &pathErr) {
+		return fs.ErrInvalid
+	}
+
 	parts := strings.Split(name, separator)
 	for i := range parts {
 		if parts[i] == "" {

modules/caddyhttp/headers/headers.go

@@ -78,7 +78,7 @@ func (h Handler) Validate() error {
 			return err
 		}
 	}
-	if h.Response != nil {
+	if h.Response != nil && h.Response.HeaderOps != nil {
 		err := h.Response.validate()
 		if err != nil {
 			return err
@@ -133,6 +133,9 @@ type HeaderOps struct {
 
 // Provision sets up the header operations.
 func (ops *HeaderOps) Provision(_ caddy.Context) error {
+	if ops == nil {
+		return nil // it's possible no ops are configured; fix #6893
+	}
 	for fieldName, replacements := range ops.Replace {
 		for i, r := range replacements {
 			if r.SearchRegexp == "" {

modules/caddyhttp/intercept/intercept.go

@@ -118,6 +118,11 @@ func (irh interceptedResponseHandler) WriteHeader(statusCode int) {
 	irh.ResponseRecorder.WriteHeader(statusCode)
 }
 
+// EXPERIMENTAL: Subject to change or removal.
+func (irh interceptedResponseHandler) Unwrap() http.ResponseWriter {
+	return irh.ResponseRecorder
+}
+
 // EXPERIMENTAL: Subject to change or removal.
 func (ir Intercept) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
 	buf := bufPool.Get().(*bytes.Buffer)

modules/caddyhttp/logging.go

@@ -211,6 +211,11 @@ func errLogValues(err error) (status int, msg string, fields func() []zapcore.Fi
 		}
 		return
 	}
+	fields = func() []zapcore.Field {
+		return []zapcore.Field{
+			zap.Error(err),
+		}
+	}
 	status = http.StatusInternalServerError
 	msg = err.Error()
 	return

modules/caddyhttp/matchers.go

@@ -1342,6 +1342,8 @@ func (m *MatchTLS) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 			case "early_data":
 				var false bool
 				m.HandshakeComplete = &false
+			default:
+				return d.Errf("unrecognized option '%s'", d.Val())
 			}
 		}
 		if d.NextArg() {

modules/caddyhttp/requestbody/caddyfile.go

@@ -68,6 +68,12 @@ func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error)
 			}
 			rb.WriteTimeout = timeout
 
+		case "set":
+			var setStr string
+			if !h.AllArgs(&setStr) {
+				return nil, h.ArgErr()
+			}
+			rb.Set = setStr
 		default:
 			return nil, h.Errf("unrecognized request_body subdirective '%s'", h.Val())
 		}

modules/caddyhttp/requestbody/requestbody.go

@@ -18,6 +18,7 @@ import (
 	"errors"
 	"io"
 	"net/http"
+	"strings"
 	"time"
 
 	"go.uber.org/zap"
@@ -43,6 +44,10 @@ type RequestBody struct {
 	// EXPERIMENTAL. Subject to change/removal.
 	WriteTimeout time.Duration `json:"write_timeout,omitempty"`
 
+	// This field permit to replace body on the fly
+	// EXPERIMENTAL. Subject to change/removal.
+	Set string `json:"set,omitempty"`
+
 	logger *zap.Logger
 }
 
@@ -60,6 +65,18 @@ func (rb *RequestBody) Provision(ctx caddy.Context) error {
 }
 
 func (rb RequestBody) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
+	if rb.Set != "" {
+		if r.Body != nil {
+			err := r.Body.Close()
+			if err != nil {
+				return err
+			}
+		}
+		repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
+		replacedBody := repl.ReplaceAll(rb.Set, "")
+		r.Body = io.NopCloser(strings.NewReader(replacedBody))
+		r.ContentLength = int64(len(replacedBody))
+	}
 	if r.Body == nil {
 		return next.ServeHTTP(w, r)
 	}

modules/caddyhttp/responsewriter.go

@@ -154,16 +154,16 @@ func (rr *responseRecorder) WriteHeader(statusCode int) {
 	// connections by manually setting headers and writing status 101
 	rr.statusCode = statusCode
 
+	// decide whether we should buffer the response
+	if rr.shouldBuffer == nil {
+		rr.stream = true
+	} else {
+		rr.stream = !rr.shouldBuffer(rr.statusCode, rr.ResponseWriterWrapper.Header())
+	}
+
 	// 1xx responses aren't final; just informational
 	if statusCode < 100 || statusCode > 199 {
 		rr.wroteHeader = true
-
-		// decide whether we should buffer the response
-		if rr.shouldBuffer == nil {
-			rr.stream = true
-		} else {
-			rr.stream = !rr.shouldBuffer(rr.statusCode, rr.ResponseWriterWrapper.Header())
-		}
 	}
 
 	// if informational or not buffered, immediately write header

modules/caddyhttp/reverseproxy/buffering_test.go

@@ -0,0 +1,84 @@
+package reverseproxy
+
+import (
+	"io"
+	"testing"
+)
+
+type zeroReader struct{}
+
+func (zeroReader) Read(p []byte) (int, error) {
+	for i := range p {
+		p[i] = 0
+	}
+	return len(p), nil
+}
+
+func TestBuffering(t *testing.T) {
+	var (
+		h  Handler
+		zr zeroReader
+	)
+	type args struct {
+		body  io.ReadCloser
+		limit int64
+	}
+	tests := []struct {
+		name        string
+		args        args
+		resultCheck func(io.ReadCloser, int64, args) bool
+	}{
+		{
+			name: "0 limit, body is returned as is",
+			args: args{
+				body:  io.NopCloser(&zr),
+				limit: 0,
+			},
+			resultCheck: func(res io.ReadCloser, read int64, args args) bool {
+				return res == args.body && read == args.limit && read == 0
+			},
+		},
+		{
+			name: "negative limit, body is read completely",
+			args: args{
+				body:  io.NopCloser(io.LimitReader(&zr, 100)),
+				limit: -1,
+			},
+			resultCheck: func(res io.ReadCloser, read int64, args args) bool {
+				brc, ok := res.(bodyReadCloser)
+				return ok && brc.body == nil && brc.buf.Len() == 100 && read == 100
+			},
+		},
+		{
+			name: "positive limit, body is read partially",
+			args: args{
+				body:  io.NopCloser(io.LimitReader(&zr, 100)),
+				limit: 50,
+			},
+			resultCheck: func(res io.ReadCloser, read int64, args args) bool {
+				brc, ok := res.(bodyReadCloser)
+				return ok && brc.body != nil && brc.buf.Len() == 50 && read == 50
+			},
+		},
+		{
+			name: "positive limit, body is read completely",
+			args: args{
+				body:  io.NopCloser(io.LimitReader(&zr, 100)),
+				limit: 101,
+			},
+			resultCheck: func(res io.ReadCloser, read int64, args args) bool {
+				brc, ok := res.(bodyReadCloser)
+				return ok && brc.body == nil && brc.buf.Len() == 100 && read == 100
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			res, read := h.bufferedBody(tt.args.body, tt.args.limit)
+			if !tt.resultCheck(res, read, tt.args) {
+				t.Error("Handler.bufferedBody() test failed")
+				return
+			}
+		})
+	}
+}

modules/caddyhttp/reverseproxy/caddyfile.go

@@ -33,6 +33,7 @@ import (
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp/headers"
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp/rewrite"
 	"github.com/caddyserver/caddy/v2/modules/caddytls"
+	"github.com/caddyserver/caddy/v2/modules/internal/network"
 )
 
 func init() {
@@ -979,7 +980,9 @@ func (h *Handler) FinalizeUnmarshalCaddyfile(helper httpcaddyfile.Helper) error
 //	    read_buffer             <size>
 //	    write_buffer            <size>
 //	    max_response_header     <size>
-//	    forward_proxy_url       <url>
+//	    network_proxy           <module> {
+//	        ...
+//	    }
 //	    dial_timeout            <duration>
 //	    dial_fallback_delay     <duration>
 //	    response_header_timeout <duration>
@@ -990,6 +993,9 @@ func (h *Handler) FinalizeUnmarshalCaddyfile(helper httpcaddyfile.Helper) error
 //	    tls_insecure_skip_verify
 //	    tls_timeout <duration>
 //	    tls_trusted_ca_certs <cert_files...>
+//	    tls_trust_pool <module> {
+//	        ...
+//	    }
 //	    tls_server_name <sni>
 //	    tls_renegotiation <level>
 //	    tls_except_ports <ports...>
@@ -1068,10 +1074,24 @@ func (h *HTTPTransport) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 			}
 
 		case "forward_proxy_url":
+			caddy.Log().Warn("The 'forward_proxy_url' field is deprecated. Use 'network_proxy <url>' instead.")
 			if !d.NextArg() {
 				return d.ArgErr()
 			}
-			h.ForwardProxyURL = d.Val()
+			u := network.ProxyFromURL{URL: d.Val()}
+			h.NetworkProxyRaw = caddyconfig.JSONModuleObject(u, "from", "url", nil)
+
+		case "network_proxy":
+			if !d.NextArg() {
+				return d.ArgErr()
+			}
+			modStem := d.Val()
+			modID := "caddy.network_proxy." + modStem
+			unm, err := caddyfile.UnmarshalModule(d, modID)
+			if err != nil {
+				return err
+			}
+			h.NetworkProxyRaw = caddyconfig.JSONModuleObject(unm, "from", modStem, nil)
 
 		case "dial_timeout":
 			if !d.NextArg() {

modules/caddyhttp/reverseproxy/fastcgi/caddyfile.go

@@ -131,15 +131,18 @@ func (t *Transport) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 // is equivalent to a route consisting of:
 //
 //	# Add trailing slash for directory requests
+//	# This redirection is automatically disabled if "{http.request.uri.path}/index.php"
+//	# doesn't appear in the try_files list
 //	@canonicalPath {
 //	    file {path}/index.php
 //	    not path */
 //	}
 //	redir @canonicalPath {path}/ 308
 //
-//	# If the requested file does not exist, try index files
+//	# If the requested file does not exist, try index files and assume index.php always exists
 //	@indexFiles file {
 //	    try_files {path} {path}/index.php index.php
+//	    try_policy first_exist_fallback
 //	    split_path .php
 //	}
 //	rewrite @indexFiles {http.matchers.file.relative}

modules/caddyhttp/reverseproxy/healthchecks.go

@@ -309,7 +309,9 @@ func (h *Handler) doActiveHealthCheckForAllHosts() {
 				}
 			}()
 
-			networkAddr, err := caddy.NewReplacer().ReplaceOrErr(upstream.Dial, true, true)
+			repl := caddy.NewReplacer()
+
+			networkAddr, err := repl.ReplaceOrErr(upstream.Dial, true, true)
 			if err != nil {
 				if c := h.HealthChecks.Active.logger.Check(zapcore.ErrorLevel, "invalid use of placeholders in dial address for active health checks"); c != nil {
 					c.Write(
@@ -344,14 +346,24 @@ func (h *Handler) doActiveHealthCheckForAllHosts() {
 				return
 			}
 			hostAddr := addr.JoinHostPort(0)
-			dialAddr := hostAddr
 			if addr.IsUnixNetwork() || addr.IsFdNetwork() {
 				// this will be used as the Host portion of a http.Request URL, and
 				// paths to socket files would produce an error when creating URL,
 				// so use a fake Host value instead; unix sockets are usually local
 				hostAddr = "localhost"
 			}
-			err = h.doActiveHealthCheck(DialInfo{Network: addr.Network, Address: dialAddr}, hostAddr, networkAddr, upstream)
+
+			// Fill in the dial info for the upstream
+			// If the upstream is set, use that instead
+			dialInfoUpstream := upstream
+			if h.HealthChecks.Active.Upstream != "" {
+				dialInfoUpstream = &Upstream{
+					Dial: h.HealthChecks.Active.Upstream,
+				}
+			}
+			dialInfo, _ := dialInfoUpstream.fillDialInfo(repl)
+
+			err = h.doActiveHealthCheck(dialInfo, hostAddr, networkAddr, upstream)
 			if err != nil {
 				if c := h.HealthChecks.Active.logger.Check(zapcore.ErrorLevel, "active health check failed"); c != nil {
 					c.Write(

modules/caddyhttp/reverseproxy/hosts.go

@@ -17,7 +17,6 @@ package reverseproxy
 import (
 	"context"
 	"fmt"
-	"net/http"
 	"net/netip"
 	"strconv"
 	"sync/atomic"
@@ -100,8 +99,7 @@ func (u *Upstream) Full() bool {
 
 // fillDialInfo returns a filled DialInfo for upstream u, using the request
 // context. Note that the returned value is not a pointer.
-func (u *Upstream) fillDialInfo(r *http.Request) (DialInfo, error) {
+func (u *Upstream) fillDialInfo(repl *caddy.Replacer) (DialInfo, error) {
-	repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
 	var addr caddy.NetworkAddress
 
 	// use provided dial address

modules/caddyhttp/reverseproxy/httptransport.go

@@ -24,7 +24,6 @@ import (
 	weakrand "math/rand"
 	"net"
 	"net/http"
-	"net/url"
 	"os"
 	"reflect"
 	"slices"
@@ -38,8 +37,10 @@ import (
 	"golang.org/x/net/http2"
 
 	"github.com/caddyserver/caddy/v2"
+	"github.com/caddyserver/caddy/v2/caddyconfig"
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
 	"github.com/caddyserver/caddy/v2/modules/caddytls"
+	"github.com/caddyserver/caddy/v2/modules/internal/network"
 )
 
 func init() {
@@ -90,6 +91,7 @@ type HTTPTransport struct {
 	//  forward_proxy_url -> upstream
 	//
 	// Default: http.ProxyFromEnvironment
+	// DEPRECATED: Use NetworkProxyRaw|`network_proxy` instead. Subject to removal.
 	ForwardProxyURL string `json:"forward_proxy_url,omitempty"`
 
 	// How long to wait before timing out trying to connect to
@@ -141,6 +143,22 @@ type HTTPTransport struct {
 	// The pre-configured underlying HTTP transport.
 	Transport *http.Transport `json:"-"`
 
+	// The module that provides the network (forward) proxy
+	// URL that the HTTP transport will use to proxy
+	// requests to the upstream. See [http.Transport.Proxy](https://pkg.go.dev/net/http#Transport.Proxy)
+	// for information regarding supported protocols.
+	//
+	// Providing a value to this parameter results in requests
+	// flowing through the reverse_proxy in the following way:
+	//
+	// User Agent ->
+	//  reverse_proxy ->
+	//  [proxy provided by the module] -> upstream
+	//
+	// If nil, defaults to reading the `HTTP_PROXY`,
+	// `HTTPS_PROXY`, and `NO_PROXY` environment variables.
+	NetworkProxyRaw json.RawMessage `json:"network_proxy,omitempty" caddy:"namespace=caddy.network_proxy inline_key=from"`
+
 	h2cTransport *http2.Transport
 	h3Transport  *http3.Transport // TODO: EXPERIMENTAL (May 2024)
 }
@@ -328,16 +346,22 @@ func (h *HTTPTransport) NewTransport(caddyCtx caddy.Context) (*http.Transport, e
 	}
 
 	// negotiate any HTTP/SOCKS proxy for the HTTP transport
-	var proxy func(*http.Request) (*url.URL, error)
+	proxy := http.ProxyFromEnvironment
 	if h.ForwardProxyURL != "" {
-		pUrl, err := url.Parse(h.ForwardProxyURL)
+		caddyCtx.Logger().Warn("forward_proxy_url is deprecated; use network_proxy instead")
+		u := network.ProxyFromURL{URL: h.ForwardProxyURL}
+		h.NetworkProxyRaw = caddyconfig.JSONModuleObject(u, "from", "url", nil)
+	}
+	if len(h.NetworkProxyRaw) != 0 {
+		proxyMod, err := caddyCtx.LoadModule(h, "NetworkProxyRaw")
 		if err != nil {
-			return nil, fmt.Errorf("failed to parse transport proxy url: %v", err)
+			return nil, fmt.Errorf("failed to load network_proxy module: %v", err)
+		}
+		if m, ok := proxyMod.(caddy.ProxyFuncProducer); ok {
+			proxy = m.ProxyFunc()
+		} else {
+			return nil, fmt.Errorf("network_proxy module is not `(func(*http.Request) (*url.URL, error))``")
 		}
-		caddyCtx.Logger().Info("setting transport proxy url", zap.String("url", h.ForwardProxyURL))
-		proxy = http.ProxyURL(pUrl)
-	} else {
-		proxy = http.ProxyFromEnvironment
 	}
 
 	rt := &http.Transport{
@@ -358,6 +382,36 @@ func (h *HTTPTransport) NewTransport(caddyCtx caddy.Context) (*http.Transport, e
 		if err != nil {
 			return nil, fmt.Errorf("making TLS client config: %v", err)
 		}
+
+		// servername has a placeholder, so we need to replace it
+		if strings.Contains(h.TLS.ServerName, "{") {
+			rt.DialTLSContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
+				// reuses the dialer from above to establish a plaintext connection
+				conn, err := dialContext(ctx, network, addr)
+				if err != nil {
+					return nil, err
+				}
+
+				// but add our own handshake logic
+				repl := ctx.Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
+				tlsConfig := rt.TLSClientConfig.Clone()
+				tlsConfig.ServerName = repl.ReplaceAll(tlsConfig.ServerName, "")
+				tlsConn := tls.Client(conn, tlsConfig)
+
+				// complete the handshake before returning the connection
+				if rt.TLSHandshakeTimeout != 0 {
+					var cancel context.CancelFunc
+					ctx, cancel = context.WithTimeout(ctx, rt.TLSHandshakeTimeout)
+					defer cancel()
+				}
+				err = tlsConn.HandshakeContext(ctx)
+				if err != nil {
+					_ = tlsConn.Close()
+					return nil, err
+				}
+				return tlsConn, nil
+			}
+		}
 	}
 
 	if h.KeepAlive != nil {
@@ -429,45 +483,9 @@ func (h *HTTPTransport) NewTransport(caddyCtx caddy.Context) (*http.Transport, e
 	return rt, nil
 }
 
-// replaceTLSServername checks TLS servername to see if it needs replacing
-// if it does need replacing, it creates a new cloned HTTPTransport object to avoid any races
-// and does the replacing of the TLS servername on that and returns the new object
-// if no replacement is necessary it returns the original
-func (h *HTTPTransport) replaceTLSServername(repl *caddy.Replacer) *HTTPTransport {
-	// check whether we have TLS and need to replace the servername in the TLSClientConfig
-	if h.TLSEnabled() && strings.Contains(h.TLS.ServerName, "{") {
-		// make a new h, "copy" the parts we don't need to touch, add a new *tls.Config and replace servername
-		newtransport := &HTTPTransport{
-			Resolver:              h.Resolver,
-			TLS:                   h.TLS,
-			KeepAlive:             h.KeepAlive,
-			Compression:           h.Compression,
-			MaxConnsPerHost:       h.MaxConnsPerHost,
-			DialTimeout:           h.DialTimeout,
-			FallbackDelay:         h.FallbackDelay,
-			ResponseHeaderTimeout: h.ResponseHeaderTimeout,
-			ExpectContinueTimeout: h.ExpectContinueTimeout,
-			MaxResponseHeaderSize: h.MaxResponseHeaderSize,
-			WriteBufferSize:       h.WriteBufferSize,
-			ReadBufferSize:        h.ReadBufferSize,
-			Versions:              h.Versions,
-			Transport:             h.Transport.Clone(),
-			h2cTransport:          h.h2cTransport,
-		}
-		newtransport.Transport.TLSClientConfig.ServerName = repl.ReplaceAll(newtransport.Transport.TLSClientConfig.ServerName, "")
-		return newtransport
-	}
-
-	return h
-}
-
 // RoundTrip implements http.RoundTripper.
 func (h *HTTPTransport) RoundTrip(req *http.Request) (*http.Response, error) {
-	// Try to replace TLS servername if needed
+	h.SetScheme(req)
-	repl := req.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
-	transport := h.replaceTLSServername(repl)
-
-	transport.SetScheme(req)
 
 	// use HTTP/3 if enabled (TODO: This is EXPERIMENTAL)
 	if h.h3Transport != nil {
@@ -483,7 +501,7 @@ func (h *HTTPTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 		return h.h2cTransport.RoundTrip(req)
 	}
 
-	return transport.Transport.RoundTrip(req)
+	return h.Transport.RoundTrip(req)
 }
 
 // SetScheme ensures that the outbound request req
@@ -628,7 +646,7 @@ func (t *TLSConfig) MakeTLSClientConfig(ctx caddy.Context) (*tls.Config, error)
 			return nil, fmt.Errorf("getting tls app: %v", err)
 		}
 		tlsApp := tlsAppIface.(*caddytls.TLS)
-		err = tlsApp.Manage([]string{t.ClientCertificateAutomate})
+		err = tlsApp.Manage(map[string]struct{}{t.ClientCertificateAutomate: {}})
 		if err != nil {
 			return nil, fmt.Errorf("managing client certificate: %v", err)
 		}

modules/caddyhttp/reverseproxy/metrics.go

@@ -1,32 +1,47 @@
 package reverseproxy
 
 import (
+	"errors"
 	"runtime/debug"
 	"sync"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promauto"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
+
+	"github.com/caddyserver/caddy/v2"
 )
 
 var reverseProxyMetrics = struct {
-	init             sync.Once
+	once             sync.Once
 	upstreamsHealthy *prometheus.GaugeVec
 	logger           *zap.Logger
 }{}
 
-func initReverseProxyMetrics(handler *Handler) {
+func initReverseProxyMetrics(handler *Handler, registry *prometheus.Registry) {
 	const ns, sub = "caddy", "reverse_proxy"
 
 	upstreamsLabels := []string{"upstream"}
-	reverseProxyMetrics.upstreamsHealthy = promauto.NewGaugeVec(prometheus.GaugeOpts{
+	reverseProxyMetrics.once.Do(func() {
-		Namespace: ns,
+		reverseProxyMetrics.upstreamsHealthy = prometheus.NewGaugeVec(prometheus.GaugeOpts{
-		Subsystem: sub,
+			Namespace: ns,
-		Name:      "upstreams_healthy",
+			Subsystem: sub,
-		Help:      "Health status of reverse proxy upstreams.",
+			Name:      "upstreams_healthy",
-	}, upstreamsLabels)
+			Help:      "Health status of reverse proxy upstreams.",
+		}, upstreamsLabels)
+	})
+
+	// duplicate registration could happen if multiple sites with reverse proxy are configured; so ignore the error because
+	// there's no good way to capture having multiple sites with reverse proxy. If this happens, the metrics will be
+	// registered twice, but the second registration will be ignored.
+	if err := registry.Register(reverseProxyMetrics.upstreamsHealthy); err != nil &&
+		!errors.Is(err, prometheus.AlreadyRegisteredError{
+			ExistingCollector: reverseProxyMetrics.upstreamsHealthy,
+			NewCollector:      reverseProxyMetrics.upstreamsHealthy,
+		}) {
+		panic(err)
+	}
 
 	reverseProxyMetrics.logger = handler.logger.Named("reverse_proxy.metrics")
 }
@@ -35,17 +50,14 @@ type metricsUpstreamsHealthyUpdater struct {
 	handler *Handler
 }
 
-func newMetricsUpstreamsHealthyUpdater(handler *Handler) *metricsUpstreamsHealthyUpdater {
+func newMetricsUpstreamsHealthyUpdater(handler *Handler, ctx caddy.Context) *metricsUpstreamsHealthyUpdater {
-	reverseProxyMetrics.init.Do(func() {
+	initReverseProxyMetrics(handler, ctx.GetMetricsRegistry())
-		initReverseProxyMetrics(handler)
-	})
-
 	reverseProxyMetrics.upstreamsHealthy.Reset()
 
 	return &metricsUpstreamsHealthyUpdater{handler}
 }
 
-func (m *metricsUpstreamsHealthyUpdater) Init() {
+func (m *metricsUpstreamsHealthyUpdater) init() {
 	go func() {
 		defer func() {
 			if err := recover(); err != nil {

modules/caddyhttp/reverseproxy/reverseproxy.go

@@ -382,8 +382,8 @@ func (h *Handler) Provision(ctx caddy.Context) error {
 		}
 	}
 
-	upstreamHealthyUpdater := newMetricsUpstreamsHealthyUpdater(h)
+	upstreamHealthyUpdater := newMetricsUpstreamsHealthyUpdater(h, ctx)
-	upstreamHealthyUpdater.Init()
+	upstreamHealthyUpdater.init()
 
 	return nil
 }
@@ -532,7 +532,7 @@ func (h *Handler) proxyLoopIteration(r *http.Request, origReq *http.Request, w h
 	// the dial address may vary per-request if placeholders are
 	// used, so perform those replacements here; the resulting
 	// DialInfo struct should have valid network address syntax
-	dialInfo, err := upstream.fillDialInfo(r)
+	dialInfo, err := upstream.fillDialInfo(repl)
 	if err != nil {
 		return true, fmt.Errorf("making dial info: %v", err)
 	}
@@ -683,7 +683,7 @@ func (h Handler) prepareRequest(req *http.Request, repl *caddy.Replacer) (*http.
 		req.Header.Set("Early-Data", "1")
 	}
 
-	reqUpType := upgradeType(req.Header)
+	reqUpgradeType := upgradeType(req.Header)
 	removeConnectionHeaders(req.Header)
 
 	// Remove hop-by-hop headers to the backend. Especially
@@ -704,9 +704,9 @@ func (h Handler) prepareRequest(req *http.Request, repl *caddy.Replacer) (*http.
 
 	// After stripping all the hop-by-hop connection headers above, add back any
 	// necessary for protocol upgrades, such as for websockets.
-	if reqUpType != "" {
+	if reqUpgradeType != "" {
 		req.Header.Set("Connection", "Upgrade")
-		req.Header.Set("Upgrade", reqUpType)
+		req.Header.Set("Upgrade", reqUpgradeType)
 		normalizeWebsocketHeaders(req.Header)
 	}
 
@@ -732,6 +732,9 @@ func (h Handler) prepareRequest(req *http.Request, repl *caddy.Replacer) (*http.
 		return nil, err
 	}
 
+	// Via header(s)
+	req.Header.Add("Via", fmt.Sprintf("%d.%d Caddy", req.ProtoMajor, req.ProtoMinor))
+
 	return req, nil
 }
 
@@ -882,13 +885,15 @@ func (h *Handler) reverseProxy(rw http.ResponseWriter, req *http.Request, origRe
 		}),
 	)
 
+	const logMessage = "upstream roundtrip"
+
 	if err != nil {
-		if c := logger.Check(zapcore.DebugLevel, "upstream roundtrip"); c != nil {
+		if c := logger.Check(zapcore.DebugLevel, logMessage); c != nil {
 			c.Write(zap.Error(err))
 		}
 		return err
 	}
-	if c := logger.Check(zapcore.DebugLevel, "upstream roundtrip"); c != nil {
+	if c := logger.Check(zapcore.DebugLevel, logMessage); c != nil {
 		c.Write(
 			zap.Object("headers", caddyhttp.LoggableHTTPHeader{
 				Header:               res.Header,
@@ -1024,6 +1029,14 @@ func (h *Handler) finalizeResponse(
 		res.Header.Del(h)
 	}
 
+	// delete our Server header and use Via instead (see #6275)
+	rw.Header().Del("Server")
+	var protoPrefix string
+	if !strings.HasPrefix(strings.ToUpper(res.Proto), "HTTP/") {
+		protoPrefix = res.Proto[:strings.Index(res.Proto, "/")+1]
+	}
+	rw.Header().Add("Via", fmt.Sprintf("%s%d.%d Caddy", protoPrefix, res.ProtoMajor, res.ProtoMinor))
+
 	// apply any response header operations
 	if h.Headers != nil && h.Headers.Response != nil {
 		if h.Headers.Response.Require == nil ||
@@ -1221,6 +1234,10 @@ func (h Handler) provisionUpstream(upstream *Upstream) {
 // then returns a reader for the buffer along with how many bytes were buffered. Always close
 // the return value when done with it, just like if it was the original body! If limit is 0
 // (which it shouldn't be), this function returns its input; i.e. is a no-op, for safety.
+// Otherwise, it returns bodyReadCloser, the original body will be closed and body will be nil
+// if it's explicitly configured to buffer all or EOF is reached when reading.
+// TODO: the error during reading is discarded if the limit is negative, should the error be propagated
+// to upstream/downstream?
 func (h Handler) bufferedBody(originalBody io.ReadCloser, limit int64) (io.ReadCloser, int64) {
 	if limit == 0 {
 		return originalBody, 0

modules/caddyhttp/server.go

@@ -408,7 +408,6 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 					if fields == nil {
 						fields = errFields()
 					}
-
 					c.Write(fields...)
 				}
 			}

modules/caddypki/acmeserver/caddyfile.go

@@ -15,8 +15,6 @@
 package acmeserver
 
 import (
-	"time"
-
 	"github.com/caddyserver/caddy/v2"
 	"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
 	"github.com/caddyserver/caddy/v2/modules/caddypki"
@@ -74,14 +72,10 @@ func parseACMEServer(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue, error
 			if !h.NextArg() {
 				return nil, h.ArgErr()
 			}
-
 			dur, err := caddy.ParseDuration(h.Val())
 			if err != nil {
 				return nil, err
 			}
-			if d := time.Duration(ca.IntermediateLifetime); d > 0 && dur > d {
-				return nil, h.Errf("certificate lifetime (%s) exceeds intermediate certificate lifetime (%s)", dur, d)
-			}
 			acmeServer.Lifetime = caddy.Duration(dur)
 		case "resolvers":
 			acmeServer.Resolvers = h.RemainingArgs()
@@ -97,19 +91,17 @@ func parseACMEServer(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue, error
 			acmeServer.Policy.AllowWildcardNames = true
 		case "allow":
 			r := &RuleSet{}
-			for h.Next() {
+			for nesting := h.Nesting(); h.NextBlock(nesting); {
-				for h.NextBlock(h.Nesting() - 1) {
+				if h.CountRemainingArgs() == 0 {
-					if h.CountRemainingArgs() == 0 {
+					return nil, h.ArgErr() // TODO:
-						return nil, h.ArgErr() // TODO:
+				}
-					}
+				switch h.Val() {
-					switch h.Val() {
+				case "domains":
-					case "domains":
+					r.Domains = append(r.Domains, h.RemainingArgs()...)
-						r.Domains = append(r.Domains, h.RemainingArgs()...)
+				case "ip_ranges":
-					case "ip_ranges":
+					r.IPRanges = append(r.IPRanges, h.RemainingArgs()...)
-						r.IPRanges = append(r.IPRanges, h.RemainingArgs()...)
+				default:
-					default:
+					return nil, h.Errf("unrecognized 'allow' subdirective: %s", h.Val())
-						return nil, h.Errf("unrecognized 'allow' subdirective: %s", h.Val())
-					}
 				}
 			}
 			if acmeServer.Policy == nil {
@@ -118,19 +110,17 @@ func parseACMEServer(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue, error
 			acmeServer.Policy.Allow = r
 		case "deny":
 			r := &RuleSet{}
-			for h.Next() {
+			for nesting := h.Nesting(); h.NextBlock(nesting); {
-				for h.NextBlock(h.Nesting() - 1) {
+				if h.CountRemainingArgs() == 0 {
-					if h.CountRemainingArgs() == 0 {
+					return nil, h.ArgErr() // TODO:
-						return nil, h.ArgErr() // TODO:
+				}
-					}
+				switch h.Val() {
-					switch h.Val() {
+				case "domains":
-					case "domains":
+					r.Domains = append(r.Domains, h.RemainingArgs()...)
-						r.Domains = append(r.Domains, h.RemainingArgs()...)
+				case "ip_ranges":
-					case "ip_ranges":
+					r.IPRanges = append(r.IPRanges, h.RemainingArgs()...)
-						r.IPRanges = append(r.IPRanges, h.RemainingArgs()...)
+				default:
-					default:
+					return nil, h.Errf("unrecognized 'deny' subdirective: %s", h.Val())
-						return nil, h.Errf("unrecognized 'deny' subdirective: %s", h.Val())
-					}
 				}
 			}
 			if acmeServer.Policy == nil {

modules/caddytls/acmeissuer.go

@@ -60,6 +60,14 @@ type ACMEIssuer struct {
 	// other than ACME transactions.
 	Email string `json:"email,omitempty"`
 
+	// Optionally select an ACME profile to use for certificate
+	// orders. Must be a profile name offered by the ACME server,
+	// which are listed at its directory endpoint.
+	//
+	// EXPERIMENTAL: Subject to change.
+	// See https://datatracker.ietf.org/doc/draft-aaron-acme-profiles/
+	Profile string `json:"profile,omitempty"`
+
 	// If you have an existing account with the ACME server, put
 	// the private key here in PEM format. The ACME client will
 	// look up your account information with this key first before
@@ -98,6 +106,9 @@ type ACMEIssuer struct {
 	// be used. EXPERIMENTAL: Subject to change.
 	CertificateLifetime caddy.Duration `json:"certificate_lifetime,omitempty"`
 
+	// Forward proxy module
+	NetworkProxyRaw json.RawMessage `json:"network_proxy,omitempty" caddy:"namespace=caddy.network_proxy inline_key=from"`
+
 	rootPool *x509.CertPool
 	logger   *zap.Logger
 
@@ -138,15 +149,30 @@ func (iss *ACMEIssuer) Provision(ctx caddy.Context) error {
 		iss.AccountKey = accountKey
 	}
 
-	// DNS providers
+	// DNS challenge provider, if not already established
-	if iss.Challenges != nil && iss.Challenges.DNS != nil && iss.Challenges.DNS.ProviderRaw != nil {
+	if iss.Challenges != nil && iss.Challenges.DNS != nil && iss.Challenges.DNS.solver == nil {
-		val, err := ctx.LoadModule(iss.Challenges.DNS, "ProviderRaw")
+		var prov certmagic.DNSProvider
-		if err != nil {
+		if iss.Challenges.DNS.ProviderRaw != nil {
-			return fmt.Errorf("loading DNS provider module: %v", err)
+			// a challenge provider has been locally configured - use it
+			val, err := ctx.LoadModule(iss.Challenges.DNS, "ProviderRaw")
+			if err != nil {
+				return fmt.Errorf("loading DNS provider module: %v", err)
+			}
+			prov = val.(certmagic.DNSProvider)
+		} else if tlsAppIface, err := ctx.AppIfConfigured("tls"); err == nil {
+			// no locally configured DNS challenge provider, but if there is
+			// a global DNS module configured with the TLS app, use that
+			tlsApp := tlsAppIface.(*TLS)
+			if tlsApp.dns != nil {
+				prov = tlsApp.dns.(certmagic.DNSProvider)
+			}
+		}
+		if prov == nil {
+			return fmt.Errorf("DNS challenge enabled, but no DNS provider configured")
 		}
 		iss.Challenges.DNS.solver = &certmagic.DNS01Solver{
 			DNSManager: certmagic.DNSManager{
-				DNSProvider:        val.(certmagic.DNSProvider),
+				DNSProvider:        prov,
 				TTL:                time.Duration(iss.Challenges.DNS.TTL),
 				PropagationDelay:   time.Duration(iss.Challenges.DNS.PropagationDelay),
 				PropagationTimeout: time.Duration(iss.Challenges.DNS.PropagationTimeout),
@@ -171,7 +197,7 @@ func (iss *ACMEIssuer) Provision(ctx caddy.Context) error {
 	}
 
 	var err error
-	iss.template, err = iss.makeIssuerTemplate()
+	iss.template, err = iss.makeIssuerTemplate(ctx)
 	if err != nil {
 		return err
 	}
@@ -179,11 +205,12 @@ func (iss *ACMEIssuer) Provision(ctx caddy.Context) error {
 	return nil
 }
 
-func (iss *ACMEIssuer) makeIssuerTemplate() (certmagic.ACMEIssuer, error) {
+func (iss *ACMEIssuer) makeIssuerTemplate(ctx caddy.Context) (certmagic.ACMEIssuer, error) {
 	template := certmagic.ACMEIssuer{
 		CA:                iss.CA,
 		TestCA:            iss.TestCA,
 		Email:             iss.Email,
+		Profile:           iss.Profile,
 		AccountKeyPEM:     iss.AccountKey,
 		CertObtainTimeout: time.Duration(iss.ACMETimeout),
 		TrustedRoots:      iss.rootPool,
@@ -192,6 +219,18 @@ func (iss *ACMEIssuer) makeIssuerTemplate() (certmagic.ACMEIssuer, error) {
 		Logger:            iss.logger,
 	}
 
+	if len(iss.NetworkProxyRaw) != 0 {
+		proxyMod, err := ctx.LoadModule(iss, "NetworkProxyRaw")
+		if err != nil {
+			return template, fmt.Errorf("failed to load network_proxy module: %v", err)
+		}
+		if m, ok := proxyMod.(caddy.ProxyFuncProducer); ok {
+			template.HTTPProxy = m.ProxyFunc()
+		} else {
+			return template, fmt.Errorf("network_proxy module is not `(func(*http.Request) (*url.URL, error))``")
+		}
+	}
+
 	if iss.Challenges != nil {
 		if iss.Challenges.HTTP != nil {
 			template.DisableHTTPChallenge = iss.Challenges.HTTP.Disabled
@@ -338,6 +377,7 @@ func (iss *ACMEIssuer) generateZeroSSLEABCredentials(ctx context.Context, acct a
 //	    dir <directory_url>
 //	    test_dir <test_directory_url>
 //	    email <email>
+//	    profile <profile_name>
 //	    timeout <duration>
 //	    disable_http_challenge
 //	    disable_tlsalpn_challenge
@@ -400,6 +440,11 @@ func (iss *ACMEIssuer) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 				return d.ArgErr()
 			}
 
+		case "profile":
+			if !d.AllArgs(&iss.Profile) {
+				return d.ArgErr()
+			}
+
 		case "timeout":
 			var timeoutStr string
 			if !d.AllArgs(&timeoutStr) {
@@ -477,21 +522,20 @@ func (iss *ACMEIssuer) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 			iss.TrustedRootsPEMFiles = d.RemainingArgs()
 
 		case "dns":
-			if !d.NextArg() {
-				return d.ArgErr()
-			}
-			provName := d.Val()
 			if iss.Challenges == nil {
 				iss.Challenges = new(ChallengesConfig)
 			}
 			if iss.Challenges.DNS == nil {
 				iss.Challenges.DNS = new(DNSChallengeConfig)
 			}
-			unm, err := caddyfile.UnmarshalModule(d, "dns.providers."+provName)
+			if d.NextArg() {
-			if err != nil {
+				provName := d.Val()
-				return err
+				unm, err := caddyfile.UnmarshalModule(d, "dns.providers."+provName)
+				if err != nil {
+					return err
+				}
+				iss.Challenges.DNS.ProviderRaw = caddyconfig.JSONModuleObject(unm, "name", provName, nil)
 			}
-			iss.Challenges.DNS.ProviderRaw = caddyconfig.JSONModuleObject(unm, "name", provName, nil)
 
 		case "propagation_delay":
 			if !d.NextArg() {

modules/caddytls/automation.go

@@ -28,6 +28,7 @@ import (
 	"github.com/mholt/acmez/v3"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
+	"golang.org/x/net/idna"
 
 	"github.com/caddyserver/caddy/v2"
 )
@@ -172,9 +173,6 @@ type AutomationPolicy struct {
 	subjects []string
 	magic    *certmagic.Config
 	storage  certmagic.Storage
-
-	// Whether this policy had explicit managers configured directly on it.
-	hadExplicitManagers bool
 }
 
 // Provision sets up ap and builds its underlying CertMagic config.
@@ -183,7 +181,12 @@ func (ap *AutomationPolicy) Provision(tlsApp *TLS) error {
 	repl := caddy.NewReplacer()
 	subjects := make([]string, len(ap.SubjectsRaw))
 	for i, sub := range ap.SubjectsRaw {
-		subjects[i] = repl.ReplaceAll(sub, "")
+		sub = repl.ReplaceAll(sub, "")
+		subASCII, err := idna.ToASCII(sub)
+		if err != nil {
+			return fmt.Errorf("could not convert automation policy subject '%s' to punycode: %v", sub, err)
+		}
+		subjects[i] = subASCII
 	}
 	ap.subjects = subjects
 
@@ -206,8 +209,9 @@ func (ap *AutomationPolicy) Provision(tlsApp *TLS) error {
 	// store them on the policy before putting it on the config
 
 	// load and provision any cert manager modules
+	var hadExplicitManagers bool
 	if ap.ManagersRaw != nil {
-		ap.hadExplicitManagers = true
+		hadExplicitManagers = true
 		vals, err := tlsApp.ctx.LoadModule(ap, "ManagersRaw")
 		if err != nil {
 			return fmt.Errorf("loading external certificate manager modules: %v", err)
@@ -267,9 +271,9 @@ func (ap *AutomationPolicy) Provision(tlsApp *TLS) error {
 		// prevent issuance from Issuers (when Managers don't provide a certificate) if there's no
 		// permission module configured
 		noProtections := ap.isWildcardOrDefault() && !ap.onlyInternalIssuer() && (tlsApp.Automation == nil || tlsApp.Automation.OnDemand == nil || tlsApp.Automation.OnDemand.permission == nil)
-		failClosed := noProtections && !ap.hadExplicitManagers // don't allow on-demand issuance (other than implicit managers) if no managers have been explicitly configured
+		failClosed := noProtections && !hadExplicitManagers // don't allow on-demand issuance (other than implicit managers) if no managers have been explicitly configured
 		if noProtections {
-			if !ap.hadExplicitManagers {
+			if !hadExplicitManagers {
 				// no managers, no explicitly-configured permission module, this is a config error
 				return fmt.Errorf("on-demand TLS cannot be enabled without a permission module to prevent abuse; please refer to documentation for details")
 			}

modules/caddytls/certmanagers.go

@@ -5,6 +5,7 @@ import (
 	"crypto/tls"
 	"fmt"
 	"io"
+	"net"
 	"net/http"
 	"net/url"
 	"strings"
@@ -143,6 +144,10 @@ func (hcg HTTPCertGetter) GetCertificate(ctx context.Context, hello *tls.ClientH
 	qs.Set("server_name", hello.ServerName)
 	qs.Set("signature_schemes", strings.Join(sigs, ","))
 	qs.Set("cipher_suites", strings.Join(suites, ","))
+	localIP, _, err := net.SplitHostPort(hello.Conn.LocalAddr().String())
+	if err == nil && localIP != "" {
+		qs.Set("local_ip", localIP)
+	}
 	parsed.RawQuery = qs.Encode()
 
 	req, err := http.NewRequestWithContext(hcg.ctx, http.MethodGet, parsed.String(), nil)

modules/caddytls/connpolicy.go

@@ -24,6 +24,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"reflect"
 	"strings"
 
 	"github.com/mholt/acmez/v3"
@@ -93,7 +94,7 @@ func (cp ConnectionPolicies) Provision(ctx caddy.Context) error {
 
 // TLSConfig returns a standard-lib-compatible TLS configuration which
 // selects the first matching policy based on the ClientHello.
-func (cp ConnectionPolicies) TLSConfig(_ caddy.Context) *tls.Config {
+func (cp ConnectionPolicies) TLSConfig(ctx caddy.Context) *tls.Config {
 	// using ServerName to match policies is extremely common, especially in configs
 	// with lots and lots of different policies; we can fast-track those by indexing
 	// them by SNI, so we don't have to iterate potentially thousands of policies
@@ -104,6 +105,7 @@ func (cp ConnectionPolicies) TLSConfig(_ caddy.Context) *tls.Config {
 			for _, m := range p.matchers {
 				if sni, ok := m.(MatchServerName); ok {
 					for _, sniName := range sni {
+						// index for fast lookups during handshakes
 						indexedBySNI[sniName] = append(indexedBySNI[sniName], p)
 					}
 				}
@@ -111,32 +113,79 @@ func (cp ConnectionPolicies) TLSConfig(_ caddy.Context) *tls.Config {
 		}
 	}
 
-	return &tls.Config{
+	getConfigForClient := func(hello *tls.ClientHelloInfo) (*tls.Config, error) {
-		MinVersion: tls.VersionTLS12,
+		// filter policies by SNI first, if possible, to speed things up
-		GetConfigForClient: func(hello *tls.ClientHelloInfo) (*tls.Config, error) {
+		// when there may be lots of policies
-			// filter policies by SNI first, if possible, to speed things up
+		possiblePolicies := cp
-			// when there may be lots of policies
+		if indexedPolicies, ok := indexedBySNI[hello.ServerName]; ok {
-			possiblePolicies := cp
+			possiblePolicies = indexedPolicies
-			if indexedPolicies, ok := indexedBySNI[hello.ServerName]; ok {
+		}
-				possiblePolicies = indexedPolicies
-			}
 
-		policyLoop:
+	policyLoop:
-			for _, pol := range possiblePolicies {
+		for _, pol := range possiblePolicies {
-				for _, matcher := range pol.matchers {
+			for _, matcher := range pol.matchers {
-					if !matcher.Match(hello) {
+				if !matcher.Match(hello) {
-						continue policyLoop
+					continue policyLoop
+				}
+			}
+			if pol.Drop {
+				return nil, fmt.Errorf("dropping connection")
+			}
+			return pol.TLSConfig, nil
+		}
+
+		return nil, fmt.Errorf("no server TLS configuration available for ClientHello: %+v", hello)
+	}
+
+	tlsCfg := &tls.Config{
+		MinVersion:         tls.VersionTLS12,
+		GetConfigForClient: getConfigForClient,
+	}
+
+	// enable ECH, if configured
+	if tlsAppIface, err := ctx.AppIfConfigured("tls"); err == nil {
+		tlsApp := tlsAppIface.(*TLS)
+
+		if tlsApp.EncryptedClientHello != nil && len(tlsApp.EncryptedClientHello.configs) > 0 {
+			// if no publication was configured, we apply ECH to all server names by default,
+			// but the TLS app needs to know what they are in this case, since they don't appear
+			// in its config (remember, TLS connection policies are used by *other* apps to
+			// run TLS servers) -- we skip names with placeholders
+			if tlsApp.EncryptedClientHello.Publication == nil {
+				var echNames []string
+				repl := caddy.NewReplacer()
+				for _, p := range cp {
+					for _, m := range p.matchers {
+						if sni, ok := m.(MatchServerName); ok {
+							for _, name := range sni {
+								finalName := strings.ToLower(repl.ReplaceAll(name, ""))
+								echNames = append(echNames, finalName)
+							}
+						}
 					}
 				}
-				if pol.Drop {
+				tlsApp.RegisterServerNames(echNames)
-					return nil, fmt.Errorf("dropping connection")
-				}
-				return pol.TLSConfig, nil
 			}
 
-			return nil, fmt.Errorf("no server TLS configuration available for ClientHello: %+v", hello)
+			// TODO: Ideally, ECH keys should be rotated. However, as of Go 1.24, the std lib implementation
-		},
+			// does not support safely modifying the tls.Config's EncryptedClientHelloKeys field.
+			// So, we implement static ECH keys temporarily. See https://github.com/golang/go/issues/71920.
+			// Revisit this after Go 1.25 is released and implement key rotation.
+			var stdECHKeys []tls.EncryptedClientHelloKey
+			for _, echConfigs := range tlsApp.EncryptedClientHello.configs {
+				for _, c := range echConfigs {
+					stdECHKeys = append(stdECHKeys, tls.EncryptedClientHelloKey{
+						Config:      c.configBin,
+						PrivateKey:  c.privKeyBin,
+						SendAsRetry: c.sendAsRetry,
+					})
+				}
+			}
+			tlsCfg.EncryptedClientHelloKeys = stdECHKeys
+		}
 	}
+
+	return tlsCfg
 }
 
 // ConnectionPolicy specifies the logic for handling a TLS handshake.
@@ -409,9 +458,18 @@ func (p ConnectionPolicy) SettingsEmpty() bool {
 		p.ProtocolMax == "" &&
 		p.ClientAuthentication == nil &&
 		p.DefaultSNI == "" &&
+		p.FallbackSNI == "" &&
 		p.InsecureSecretsLog == ""
 }
 
+// SettingsEmpty returns true if p's settings (fields
+// except the matchers) are the same as q.
+func (p ConnectionPolicy) SettingsEqual(q ConnectionPolicy) bool {
+	p.MatchersRaw = nil
+	q.MatchersRaw = nil
+	return reflect.DeepEqual(p, q)
+}
+
 // UnmarshalCaddyfile sets up the ConnectionPolicy from Caddyfile tokens. Syntax:
 //
 //	connection_policy {
@@ -749,10 +807,14 @@ func (clientauth *ClientAuthentication) provision(ctx caddy.Context) error {
 
 	// if we have TrustedCACerts explicitly set, create an 'inline' CA and return
 	if len(clientauth.TrustedCACerts) > 0 {
-		clientauth.ca = InlineCAPool{
+		caPool := InlineCAPool{
 			TrustedCACerts: clientauth.TrustedCACerts,
 		}
-		return nil
+		err := caPool.Provision(ctx)
+		if err != nil {
+			return nil
+		}
+		clientauth.ca = caPool
 	}
 
 	// if we don't have any CARaw set, there's not much work to do
@@ -884,22 +946,13 @@ func setDefaultTLSParams(cfg *tls.Config) {
 	cfg.CipherSuites = append([]uint16{tls.TLS_FALLBACK_SCSV}, cfg.CipherSuites...)
 
 	if len(cfg.CurvePreferences) == 0 {
-		// We would want to write
+		cfg.CurvePreferences = defaultCurves
-		//
-		//	cfg.CurvePreferences = defaultCurves
-		//
-		// but that would disable the post-quantum key agreement X25519Kyber768
-		// supported in Go 1.23, for which the CurveID is not exported.
-		// Instead, we'll set CurvePreferences to nil, which will enable PQC.
-		// See https://github.com/caddyserver/caddy/issues/6540
-		cfg.CurvePreferences = nil
 	}
 
-	if cfg.MinVersion == 0 {
+	// crypto/tls docs:
-		cfg.MinVersion = tls.VersionTLS12
+	// "If EncryptedClientHelloKeys is set, MinVersion, if set, must be VersionTLS13."
-	}
+	if cfg.EncryptedClientHelloKeys != nil && cfg.MinVersion != 0 && cfg.MinVersion < tls.VersionTLS13 {
-	if cfg.MaxVersion == 0 {
+		cfg.MinVersion = tls.VersionTLS13
-		cfg.MaxVersion = tls.VersionTLS13
 	}
 }
 

modules/caddytls/connpolicy_test.go

@@ -20,6 +20,7 @@ import (
 	"reflect"
 	"testing"
 
+	"github.com/caddyserver/caddy/v2"
 	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
 )
 
@@ -278,3 +279,49 @@ func TestClientAuthenticationUnmarshalCaddyfileWithDirectiveName(t *testing.T) {
 		})
 	}
 }
+
+func TestClientAuthenticationProvision(t *testing.T) {
+	tests := []struct {
+		name    string
+		ca      ClientAuthentication
+		wantErr bool
+	}{
+		{
+			name: "specifying both 'CARaw' and 'TrustedCACerts' produces an error",
+			ca: ClientAuthentication{
+				CARaw:          json.RawMessage(`{"provider":"inline","trusted_ca_certs":["foo"]}`),
+				TrustedCACerts: []string{"foo"},
+			},
+			wantErr: true,
+		},
+		{
+			name: "specifying both 'CARaw' and 'TrustedCACertPEMFiles' produces an error",
+			ca: ClientAuthentication{
+				CARaw:                 json.RawMessage(`{"provider":"inline","trusted_ca_certs":["foo"]}`),
+				TrustedCACertPEMFiles: []string{"foo"},
+			},
+			wantErr: true,
+		},
+		{
+			name: "setting 'TrustedCACerts' provisions the cert pool",
+			ca: ClientAuthentication{
+				TrustedCACerts: []string{test_der_1},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := tt.ca.provision(caddy.Context{})
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ClientAuthentication.provision() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !tt.wantErr {
+				if tt.ca.ca.CertPool() == nil {
+					t.Error("CertPool is nil, expected non-nil value")
+				}
+			}
+		})
+	}
+}

modules/caddytls/ech.go

@@ -0,0 +1,983 @@
+package caddytls
+
+import (
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io/fs"
+	weakrand "math/rand/v2"
+	"path"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/caddyserver/certmagic"
+	"github.com/cloudflare/circl/hpke"
+	"github.com/cloudflare/circl/kem"
+	"github.com/libdns/libdns"
+	"go.uber.org/zap"
+	"golang.org/x/crypto/cryptobyte"
+
+	"github.com/caddyserver/caddy/v2"
+)
+
+func init() {
+	caddy.RegisterModule(ECHDNSPublisher{})
+}
+
+// ECH enables Encrypted ClientHello (ECH) and configures its management.
+//
+// ECH helps protect site names (also called "server names" or "domain names"
+// or "SNI"), which are normally sent over plaintext when establishing a TLS
+// connection. With ECH, the true ClientHello is encrypted and wrapped by an
+// "outer" ClientHello that uses a more generic, shared server name that is
+// publicly known.
+//
+// Clients need to know which public name (and other parameters) to use when
+// connecting to a site with ECH, and the methods for this vary; however,
+// major browsers support reading ECH configurations from DNS records (which
+// is typically only secure when DNS-over-HTTPS or DNS-over-TLS is enabled in
+// the client). Caddy has the ability to automatically publish ECH configs to
+// DNS records if a DNS provider is configured either in the TLS app or with
+// each individual publication config object. (Requires a custom build with a
+// DNS provider module.)
+//
+// ECH requires at least TLS 1.3, so any TLS connection policies with ECH
+// applied will automatically upgrade the minimum TLS version to 1.3, even if
+// configured to a lower version.
+//
+// Note that, as of Caddy 2.10.0 (~March 2025), ECH keys are not automatically
+// rotated due to a limitation in the Go standard library (see
+// https://github.com/golang/go/issues/71920). This should be resolved when
+// Go 1.25 is released (~Aug. 2025), and Caddy will be updated to automatically
+// rotate ECH keys/configs at that point.
+//
+// EXPERIMENTAL: Subject to change.
+type ECH struct {
+	// The list of ECH configurations for which to automatically generate
+	// and rotate keys. At least one is required to enable ECH.
+	//
+	// It is strongly recommended to use as few ECH configs as possible
+	// to maximize the size of your anonymity set (see the ECH specification
+	// for a definition). Typically, each server should have only one public
+	// name, i.e. one config in this list.
+	Configs []ECHConfiguration `json:"configs,omitempty"`
+
+	// Publication describes ways to publish ECH configs for clients to
+	// discover and use. Without publication, most clients will not use
+	// ECH at all, and those that do will suffer degraded performance.
+	//
+	// Most major browsers support ECH by way of publication to HTTPS
+	// DNS RRs. (This also typically requires that they use DoH or DoT.)
+	Publication []*ECHPublication `json:"publication,omitempty"`
+
+	// map of public_name to list of configs
+	configs map[string][]echConfig
+}
+
+// Provision loads or creates ECH configs and returns outer names (for certificate
+// management), but does not publish any ECH configs. The DNS module is used as
+// a default for later publishing if needed.
+func (ech *ECH) Provision(ctx caddy.Context) ([]string, error) {
+	logger := ctx.Logger().Named("ech")
+
+	// set up publication modules before we need to obtain a lock in storage,
+	// since this is strictly internal and doesn't require synchronization
+	for i, pub := range ech.Publication {
+		mods, err := ctx.LoadModule(pub, "PublishersRaw")
+		if err != nil {
+			return nil, fmt.Errorf("loading ECH publication modules: %v", err)
+		}
+		for _, modIface := range mods.(map[string]any) {
+			ech.Publication[i].publishers = append(ech.Publication[i].publishers, modIface.(ECHPublisher))
+		}
+	}
+
+	// the rest of provisioning needs an exclusive lock so that instances aren't
+	// stepping on each other when setting up ECH configs
+	storage := ctx.Storage()
+	const echLockName = "ech_provision"
+	if err := storage.Lock(ctx, echLockName); err != nil {
+		return nil, err
+	}
+	defer func() {
+		if err := storage.Unlock(ctx, echLockName); err != nil {
+			logger.Error("unable to unlock ECH provisioning in storage", zap.Error(err))
+		}
+	}()
+
+	var outerNames []string //nolint:prealloc // (FALSE POSITIVE - see https://github.com/alexkohler/prealloc/issues/30)
+
+	// start by loading all the existing configs (even the older ones on the way out,
+	// since some clients may still be using them if they haven't yet picked up on the
+	// new configs)
+	cfgKeys, err := storage.List(ctx, echConfigsKey, false)
+	if err != nil && !errors.Is(err, fs.ErrNotExist) { // OK if dir doesn't exist; it will be created
+		return nil, err
+	}
+	for _, cfgKey := range cfgKeys {
+		cfg, err := loadECHConfig(ctx, path.Base(cfgKey))
+		if err != nil {
+			return nil, err
+		}
+		// if any part of the config's folder was corrupted, the load function will
+		// clean it up and not return an error, since configs are immutable and
+		// fairly ephemeral... so just check that we actually got a populated config
+		if cfg.configBin == nil || cfg.privKeyBin == nil {
+			continue
+		}
+		logger.Debug("loaded ECH config",
+			zap.String("public_name", cfg.RawPublicName),
+			zap.Uint8("id", cfg.ConfigID))
+		ech.configs[cfg.RawPublicName] = append(ech.configs[cfg.RawPublicName], cfg)
+		outerNames = append(outerNames, cfg.RawPublicName)
+	}
+
+	// all existing configs are now loaded; see if we need to make any new ones
+	// based on the input configuration, and also mark the most recent one(s) as
+	// current/active, so they can be used for ECH retries
+	for _, cfg := range ech.Configs {
+		publicName := strings.ToLower(strings.TrimSpace(cfg.PublicName))
+
+		if list, ok := ech.configs[publicName]; ok && len(list) > 0 {
+			// at least one config with this public name was loaded, so find the
+			// most recent one and mark it as active to be used with retries
+			var mostRecentDate time.Time
+			var mostRecentIdx int
+			for i, c := range list {
+				if mostRecentDate.IsZero() || c.meta.Created.After(mostRecentDate) {
+					mostRecentDate = c.meta.Created
+					mostRecentIdx = i
+				}
+			}
+			list[mostRecentIdx].sendAsRetry = true
+		} else {
+			// no config with this public name was loaded, so create one
+			echCfg, err := generateAndStoreECHConfig(ctx, publicName)
+			if err != nil {
+				return nil, err
+			}
+			logger.Debug("generated new ECH config",
+				zap.String("public_name", echCfg.RawPublicName),
+				zap.Uint8("id", echCfg.ConfigID))
+			ech.configs[publicName] = append(ech.configs[publicName], echCfg)
+			outerNames = append(outerNames, publicName)
+		}
+	}
+
+	return outerNames, nil
+}
+
+func (t *TLS) publishECHConfigs() error {
+	logger := t.logger.Named("ech")
+
+	// make publication exclusive, since we don't need to repeat this unnecessarily
+	storage := t.ctx.Storage()
+	const echLockName = "ech_publish"
+	if err := storage.Lock(t.ctx, echLockName); err != nil {
+		return err
+	}
+	defer func() {
+		if err := storage.Unlock(t.ctx, echLockName); err != nil {
+			logger.Error("unable to unlock ECH provisioning in storage", zap.Error(err))
+		}
+	}()
+
+	// get the publication config, or use a default if not specified
+	// (the default publication config should be to publish all ECH
+	// configs to the app-global DNS provider; if no DNS provider is
+	// configured, then this whole function is basically a no-op)
+	publicationList := t.EncryptedClientHello.Publication
+	if publicationList == nil {
+		if dnsProv, ok := t.dns.(ECHDNSProvider); ok {
+			publicationList = []*ECHPublication{
+				{
+					publishers: []ECHPublisher{
+						&ECHDNSPublisher{
+							provider: dnsProv,
+							logger:   t.logger,
+						},
+					},
+				},
+			}
+		}
+	}
+
+	// for each publication config, build the list of ECH configs to
+	// publish with it, and figure out which inner names to publish
+	// to/for, then publish
+	for _, publication := range publicationList {
+		// this publication is either configured for specific ECH configs,
+		// or we just use an implied default of all ECH configs
+		var echCfgList echConfigList
+		var configIDs []uint8 // TODO: use IDs or the outer names?
+		if publication.Configs == nil {
+			// by default, publish all configs
+			for _, configs := range t.EncryptedClientHello.configs {
+				echCfgList = append(echCfgList, configs...)
+				for _, c := range configs {
+					configIDs = append(configIDs, c.ConfigID)
+				}
+			}
+		} else {
+			for _, cfgOuterName := range publication.Configs {
+				if cfgList, ok := t.EncryptedClientHello.configs[cfgOuterName]; ok {
+					echCfgList = append(echCfgList, cfgList...)
+					for _, c := range cfgList {
+						configIDs = append(configIDs, c.ConfigID)
+					}
+				}
+			}
+		}
+
+		// marshal the ECH config list as binary for publication
+		echCfgListBin, err := echCfgList.MarshalBinary()
+		if err != nil {
+			return fmt.Errorf("marshaling ECH config list: %v", err)
+		}
+
+		// now we have our list of ECH configs to publish and the inner names
+		// to publish for (i.e. the names being protected); iterate each publisher
+		// and do the publish for any config+name that needs a publish
+		for _, publisher := range publication.publishers {
+			publisherKey := publisher.PublisherKey()
+
+			// by default, publish for all (non-outer) server names, unless
+			// a specific list of names is configured
+			var serverNamesSet map[string]struct{}
+			if publication.Domains == nil {
+				serverNamesSet = make(map[string]struct{}, len(t.serverNames))
+				for name := range t.serverNames {
+					serverNamesSet[name] = struct{}{}
+				}
+			} else {
+				serverNamesSet = make(map[string]struct{}, len(publication.Domains))
+				for _, name := range publication.Domains {
+					serverNamesSet[name] = struct{}{}
+				}
+			}
+
+			// remove any domains from the set which have already had all configs in the
+			// list published by this publisher, to avoid always re-publishing unnecessarily
+			for configuredInnerName := range serverNamesSet {
+				allConfigsPublished := true
+				for _, cfg := range echCfgList {
+					// TODO: Potentially utilize the timestamp (map value) for recent-enough publication, instead of just checking for existence
+					if _, ok := cfg.meta.Publications[publisherKey][configuredInnerName]; !ok {
+						allConfigsPublished = false
+						break
+					}
+				}
+				if allConfigsPublished {
+					delete(serverNamesSet, configuredInnerName)
+				}
+			}
+
+			// if all the (inner) domains have had this ECH config list published
+			// by this publisher, then try the next publication config
+			if len(serverNamesSet) == 0 {
+				logger.Debug("ECH config list already published by publisher for associated domains (or no domains to publish for)",
+					zap.Uint8s("config_ids", configIDs),
+					zap.String("publisher", publisherKey))
+				continue
+			}
+
+			// convert the set of names to a slice
+			dnsNamesToPublish := make([]string, 0, len(serverNamesSet))
+			for name := range serverNamesSet {
+				dnsNamesToPublish = append(dnsNamesToPublish, name)
+			}
+
+			logger.Debug("publishing ECH config list",
+				zap.Strings("domains", dnsNamesToPublish),
+				zap.Uint8s("config_ids", configIDs))
+
+			// publish this ECH config list with this publisher
+			pubTime := time.Now()
+			err := publisher.PublishECHConfigList(t.ctx, dnsNamesToPublish, echCfgListBin)
+			if err == nil {
+				t.logger.Info("published ECH configuration list",
+					zap.Strings("domains", dnsNamesToPublish),
+					zap.Uint8s("config_ids", configIDs),
+					zap.Error(err))
+				// update publication history, so that we don't unnecessarily republish every time
+				for _, cfg := range echCfgList {
+					if cfg.meta.Publications == nil {
+						cfg.meta.Publications = make(publicationHistory)
+					}
+					if _, ok := cfg.meta.Publications[publisherKey]; !ok {
+						cfg.meta.Publications[publisherKey] = make(map[string]time.Time)
+					}
+					for _, name := range dnsNamesToPublish {
+						cfg.meta.Publications[publisherKey][name] = pubTime
+					}
+					metaBytes, err := json.Marshal(cfg.meta)
+					if err != nil {
+						return fmt.Errorf("marshaling ECH config metadata: %v", err)
+					}
+					metaKey := path.Join(echConfigsKey, strconv.Itoa(int(cfg.ConfigID)), "meta.json")
+					if err := t.ctx.Storage().Store(t.ctx, metaKey, metaBytes); err != nil {
+						return fmt.Errorf("storing updated ECH config metadata: %v", err)
+					}
+				}
+			} else {
+				t.logger.Error("publishing ECH configuration list",
+					zap.Strings("domains", publication.Domains),
+					zap.Uint8s("config_ids", configIDs),
+					zap.Error(err))
+			}
+		}
+	}
+
+	return nil
+}
+
+// loadECHConfig loads the config from storage with the given configID.
+// An error is not actually returned in some cases the config fails to
+// load because in some cases it just means the config ID folder has
+// been cleaned up in storage, maybe due to an incomplete set of keys
+// or corrupted contents; in any case, the only rectification is to
+// delete it and make new keys (an error IS returned if deleting the
+// corrupted keys fails, for example). Check the returned echConfig for
+// non-nil privKeyBin and configBin values before using.
+func loadECHConfig(ctx caddy.Context, configID string) (echConfig, error) {
+	storage := ctx.Storage()
+	logger := ctx.Logger()
+
+	cfgIDKey := path.Join(echConfigsKey, configID)
+	keyKey := path.Join(cfgIDKey, "key.bin")
+	configKey := path.Join(cfgIDKey, "config.bin")
+	metaKey := path.Join(cfgIDKey, "meta.json")
+
+	// if loading anything fails, might as well delete this folder and free up
+	// the config ID; spec is designed to rotate configs frequently anyway
+	// (I consider it a more serious error if we can't clean up the folder,
+	// since leaving stray storage keys is confusing)
+	privKeyBytes, err := storage.Load(ctx, keyKey)
+	if err != nil {
+		delErr := storage.Delete(ctx, cfgIDKey)
+		if delErr != nil {
+			return echConfig{}, fmt.Errorf("error loading private key (%v) and cleaning up parent storage key %s: %v", err, cfgIDKey, delErr)
+		}
+		logger.Warn("could not load ECH private key; deleting its config folder",
+			zap.String("config_id", configID),
+			zap.Error(err))
+		return echConfig{}, nil
+	}
+	echConfigBytes, err := storage.Load(ctx, configKey)
+	if err != nil {
+		delErr := storage.Delete(ctx, cfgIDKey)
+		if delErr != nil {
+			return echConfig{}, fmt.Errorf("error loading ECH config (%v) and cleaning up parent storage key %s: %v", err, cfgIDKey, delErr)
+		}
+		logger.Warn("could not load ECH config; deleting its config folder",
+			zap.String("config_id", configID),
+			zap.Error(err))
+		return echConfig{}, nil
+	}
+	var cfg echConfig
+	if err := cfg.UnmarshalBinary(echConfigBytes); err != nil {
+		delErr := storage.Delete(ctx, cfgIDKey)
+		if delErr != nil {
+			return echConfig{}, fmt.Errorf("error loading ECH config (%v) and cleaning up parent storage key %s: %v", err, cfgIDKey, delErr)
+		}
+		logger.Warn("could not load ECH config; deleted its config folder",
+			zap.String("config_id", configID),
+			zap.Error(err))
+		return echConfig{}, nil
+	}
+	metaBytes, err := storage.Load(ctx, metaKey)
+	if errors.Is(err, fs.ErrNotExist) {
+		logger.Warn("ECH config metadata file missing; will recreate at next publication",
+			zap.String("config_id", configID),
+			zap.Error(err))
+	} else if err != nil {
+		delErr := storage.Delete(ctx, cfgIDKey)
+		if delErr != nil {
+			return echConfig{}, fmt.Errorf("error loading ECH config metadata (%v) and cleaning up parent storage key %s: %v", err, cfgIDKey, delErr)
+		}
+		logger.Warn("could not load ECH config metadata; deleted its folder",
+			zap.String("config_id", configID),
+			zap.Error(err))
+		return echConfig{}, nil
+	}
+	var meta echConfigMeta
+	if len(metaBytes) > 0 {
+		if err := json.Unmarshal(metaBytes, &meta); err != nil {
+			// even though it's just metadata, reset the whole config since we can't reliably maintain it
+			delErr := storage.Delete(ctx, cfgIDKey)
+			if delErr != nil {
+				return echConfig{}, fmt.Errorf("error decoding ECH metadata (%v) and cleaning up parent storage key %s: %v", err, cfgIDKey, delErr)
+			}
+			logger.Warn("could not JSON-decode ECH metadata; deleted its config folder",
+				zap.String("config_id", configID),
+				zap.Error(err))
+			return echConfig{}, nil
+		}
+	}
+
+	cfg.privKeyBin = privKeyBytes
+	cfg.configBin = echConfigBytes
+	cfg.meta = meta
+
+	return cfg, nil
+}
+
+func generateAndStoreECHConfig(ctx caddy.Context, publicName string) (echConfig, error) {
+	// Go currently has very strict requirements for server-side ECH configs,
+	// to quote the Go 1.24 godoc (with typos of AEAD IDs corrected):
+	//
+	// "Config should be a marshalled ECHConfig associated with PrivateKey. This
+	// must match the config provided to clients byte-for-byte. The config
+	// should only specify the DHKEM(X25519, HKDF-SHA256) KEM ID (0x0020), the
+	// HKDF-SHA256 KDF ID (0x0001), and a subset of the following AEAD IDs:
+	// AES-128-GCM (0x0001), AES-256-GCM (0x0002), ChaCha20Poly1305 (0x0003)."
+	//
+	// So we need to be sure we generate a config within these parameters
+	// so the Go TLS server can use it.
+
+	// generate a key pair
+	const kemChoice = hpke.KEM_X25519_HKDF_SHA256
+	publicKey, privateKey, err := kemChoice.Scheme().GenerateKeyPair()
+	if err != nil {
+		return echConfig{}, err
+	}
+
+	// find an available config ID
+	configID, err := newECHConfigID(ctx)
+	if err != nil {
+		return echConfig{}, fmt.Errorf("generating unique config ID: %v", err)
+	}
+
+	echCfg := echConfig{
+		PublicKey:     publicKey,
+		Version:       draftTLSESNI22,
+		ConfigID:      configID,
+		RawPublicName: publicName,
+		KEMID:         kemChoice,
+		CipherSuites: []hpkeSymmetricCipherSuite{
+			{
+				KDFID:  hpke.KDF_HKDF_SHA256,
+				AEADID: hpke.AEAD_AES128GCM,
+			},
+			{
+				KDFID:  hpke.KDF_HKDF_SHA256,
+				AEADID: hpke.AEAD_AES256GCM,
+			},
+			{
+				KDFID:  hpke.KDF_HKDF_SHA256,
+				AEADID: hpke.AEAD_ChaCha20Poly1305,
+			},
+		},
+		sendAsRetry: true,
+	}
+	meta := echConfigMeta{
+		Created: time.Now(),
+	}
+
+	privKeyBytes, err := privateKey.MarshalBinary()
+	if err != nil {
+		return echConfig{}, fmt.Errorf("marshaling ECH private key: %v", err)
+	}
+	echConfigBytes, err := echCfg.MarshalBinary()
+	if err != nil {
+		return echConfig{}, fmt.Errorf("marshaling ECH config: %v", err)
+	}
+	metaBytes, err := json.Marshal(meta)
+	if err != nil {
+		return echConfig{}, fmt.Errorf("marshaling ECH config metadata: %v", err)
+	}
+
+	parentKey := path.Join(echConfigsKey, strconv.Itoa(int(configID)))
+	keyKey := path.Join(parentKey, "key.bin")
+	configKey := path.Join(parentKey, "config.bin")
+	metaKey := path.Join(parentKey, "meta.json")
+
+	if err := ctx.Storage().Store(ctx, keyKey, privKeyBytes); err != nil {
+		return echConfig{}, fmt.Errorf("storing ECH private key: %v", err)
+	}
+	if err := ctx.Storage().Store(ctx, configKey, echConfigBytes); err != nil {
+		return echConfig{}, fmt.Errorf("storing ECH config: %v", err)
+	}
+	if err := ctx.Storage().Store(ctx, metaKey, metaBytes); err != nil {
+		return echConfig{}, fmt.Errorf("storing ECH config metadata: %v", err)
+	}
+
+	echCfg.privKeyBin = privKeyBytes
+	echCfg.configBin = echConfigBytes // this contains the public key
+	echCfg.meta = meta
+
+	return echCfg, nil
+}
+
+// ECH represents an Encrypted ClientHello configuration.
+//
+// EXPERIMENTAL: Subject to change.
+type ECHConfiguration struct {
+	// The public server name (SNI) that will be used in the outer ClientHello.
+	// This should be a domain name for which this server is authoritative,
+	// because Caddy will try to provision a certificate for this name. As an
+	// outer SNI, it is never used for application data (HTTPS, etc.), but it
+	// is necessary for enabling clients to connect securely in some cases.
+	// If this field is empty or missing, or if Caddy cannot get a certificate
+	// for this domain (e.g. the domain's DNS records do not point to this server),
+	// client reliability becomes brittle, and you risk coercing clients to expose
+	// true server names in plaintext, which compromises both the privacy of the
+	// server and makes clients more vulnerable.
+	PublicName string `json:"public_name"`
+}
+
+// ECHPublication configures publication of ECH config(s). It pairs a list
+// of ECH configs with the list of domains they are assigned to protect, and
+// describes how to publish those configs for those domains.
+//
+// Most servers will have only a single publication config, unless their
+// domains are spread across multiple DNS providers or require different
+// methods of publication.
+//
+// EXPERIMENTAL: Subject to change.
+type ECHPublication struct {
+	// The list of ECH configurations to publish, identified by public name.
+	// If not set, all configs will be included for publication by default.
+	//
+	// It is generally advised to maximize the size of your anonymity set,
+	// which implies using as few public names as possible for your sites.
+	// Usually, only a single public name is used to protect all the sites
+	// for a server
+	//
+	// EXPERIMENTAL: This field may be renamed or have its structure changed.
+	Configs []string `json:"configs,omitempty"`
+
+	// The list of ("inner") domain names which are protected with the associated
+	// ECH configurations.
+	//
+	// If not set, all server names registered with the TLS module will be
+	// added to this list implicitly. (This registration is done automatically
+	// by other Caddy apps that use the TLS module. They should register their
+	// configured server names for this purpose. For example, the HTTP server
+	// registers the hostnames for which it applies automatic HTTPS. This is
+	// not something you, the user, have to do.) Most servers
+	//
+	// Names in this list should not appear in any other publication config
+	// object with the same publishers, since the publications will likely
+	// overwrite each other.
+	//
+	// NOTE: In order to publish ECH configs for domains configured for
+	// On-Demand TLS that are not explicitly enumerated elsewhere in the
+	// config, those domain names will have to be listed here. The only
+	// time Caddy knows which domains it is serving with On-Demand TLS is
+	// handshake-time, which is too late for publishing ECH configs; it
+	// means the first connections would not protect the server names,
+	// revealing that information to observers, and thus defeating the
+	// purpose of ECH. Hence the need to list them here so Caddy can
+	// proactively publish ECH configs before clients connect with those
+	// server names in plaintext.
+	Domains []string `json:"domains,omitempty"`
+
+	// How to publish the ECH configurations so clients can know to use
+	// ECH to connect more securely to the server.
+	PublishersRaw caddy.ModuleMap `json:"publishers,omitempty" caddy:"namespace=tls.ech.publishers"`
+	publishers    []ECHPublisher
+}
+
+// ECHDNSProvider can service DNS entries for ECH purposes.
+type ECHDNSProvider interface {
+	libdns.RecordGetter
+	libdns.RecordSetter
+}
+
+// ECHDNSPublisher configures how to publish an ECH configuration to
+// DNS records for the specified domains.
+//
+// EXPERIMENTAL: Subject to change.
+type ECHDNSPublisher struct {
+	// The DNS provider module which will establish the HTTPS record(s).
+	ProviderRaw json.RawMessage `json:"provider,omitempty" caddy:"namespace=dns.providers inline_key=name"`
+	provider    ECHDNSProvider
+
+	logger *zap.Logger
+}
+
+// CaddyModule returns the Caddy module information.
+func (ECHDNSPublisher) CaddyModule() caddy.ModuleInfo {
+	return caddy.ModuleInfo{
+		ID:  "tls.ech.publishers.dns",
+		New: func() caddy.Module { return new(ECHDNSPublisher) },
+	}
+}
+
+func (dnsPub *ECHDNSPublisher) Provision(ctx caddy.Context) error {
+	dnsProvMod, err := ctx.LoadModule(dnsPub, "ProviderRaw")
+	if err != nil {
+		return fmt.Errorf("loading ECH DNS provider module: %v", err)
+	}
+	prov, ok := dnsProvMod.(ECHDNSProvider)
+	if !ok {
+		return fmt.Errorf("ECH DNS provider module is not an ECH DNS Provider: %v", err)
+	}
+	dnsPub.provider = prov
+	dnsPub.logger = ctx.Logger()
+	return nil
+}
+
+// PublisherKey returns the name of the DNS provider module.
+// We intentionally omit specific provider configuration (or a hash thereof,
+// since the config is likely sensitive, potentially containing an API key)
+// because it is unlikely that specific configuration, such as an API key,
+// is relevant to unique key use as an ECH config publisher.
+func (dnsPub ECHDNSPublisher) PublisherKey() string {
+	return string(dnsPub.provider.(caddy.Module).CaddyModule().ID)
+}
+
+// PublishECHConfigList publishes the given ECH config list to the given DNS names.
+func (dnsPub *ECHDNSPublisher) PublishECHConfigList(ctx context.Context, innerNames []string, configListBin []byte) error {
+	nameservers := certmagic.RecursiveNameservers(nil) // TODO: we could make resolvers configurable
+
+nextName:
+	for _, domain := range innerNames {
+		zone, err := certmagic.FindZoneByFQDN(ctx, dnsPub.logger, domain, nameservers)
+		if err != nil {
+			dnsPub.logger.Error("could not determine zone for domain",
+				zap.String("domain", domain),
+				zap.Error(err))
+			continue
+		}
+
+		relName := libdns.RelativeName(domain+".", zone)
+
+		// get existing records for this domain; we need to make sure another
+		// record exists for it so we don't accidentally trample a wildcard; we
+		// also want to get any HTTPS record that may already exist for it so
+		// we can augment the ech SvcParamKey with any other existing SvcParams
+		recs, err := dnsPub.provider.GetRecords(ctx, zone)
+		if err != nil {
+			dnsPub.logger.Error("unable to get existing DNS records to publish ECH data to HTTPS DNS record",
+				zap.String("domain", domain),
+				zap.Error(err))
+			continue
+		}
+		var httpsRec libdns.ServiceBinding
+		var nameHasExistingRecord bool
+		for _, rec := range recs {
+			rr := rec.RR()
+			if rr.Name == relName {
+				// CNAME records are exclusive of all other records, so we cannot publish an HTTPS
+				// record for a domain that is CNAME'd. See #6922.
+				if rr.Type == "CNAME" {
+					dnsPub.logger.Warn("domain has CNAME record, so unable to publish ECH data to HTTPS record",
+						zap.String("domain", domain),
+						zap.String("cname_value", rr.Data))
+					continue nextName
+				}
+				nameHasExistingRecord = true
+				if svcb, ok := rec.(libdns.ServiceBinding); ok && svcb.Scheme == "https" {
+					if svcb.Target == "" || svcb.Target == "." {
+						httpsRec = svcb
+						break
+					}
+				}
+			}
+		}
+		if !nameHasExistingRecord {
+			// Turns out if you publish a DNS record for a name that doesn't have any DNS record yet,
+			// any wildcard records won't apply for the name anymore, meaning if a wildcard A/AAAA record
+			// is used to resolve the domain to a server, publishing an HTTPS record could break resolution!
+			// In theory, this should be a non-issue, at least for A/AAAA records, if the HTTPS record
+			// includes ipv[4|6]hint SvcParamKeys,
+			dnsPub.logger.Warn("domain does not have any existing records, so skipping publication of HTTPS record",
+				zap.String("domain", domain),
+				zap.String("relative_name", relName),
+				zap.String("zone", zone))
+			continue
+		}
+		params := httpsRec.Params
+		if params == nil {
+			params = make(libdns.SvcParams)
+		}
+
+		// overwrite only the "ech" SvcParamKey
+		params["ech"] = []string{base64.StdEncoding.EncodeToString(configListBin)}
+
+		// publish record
+		_, err = dnsPub.provider.SetRecords(ctx, zone, []libdns.Record{
+			libdns.ServiceBinding{
+				// HTTPS and SVCB RRs: RFC 9460 (https://www.rfc-editor.org/rfc/rfc9460)
+				Scheme:   "https",
+				Name:     relName,
+				TTL:      5 * time.Minute, // TODO: low hard-coded value only temporary; change to a higher value once more field-tested and key rotation is implemented
+				Priority: 2,               // allows a manual override with priority 1
+				Target:   ".",
+				Params:   params,
+			},
+		})
+		if err != nil {
+			// TODO: Maybe this should just stop and return the error...
+			dnsPub.logger.Error("unable to publish ECH data to HTTPS DNS record",
+				zap.String("domain", domain),
+				zap.String("zone", zone),
+				zap.String("dns_record_name", relName),
+				zap.Error(err))
+			continue
+		}
+	}
+
+	return nil
+}
+
+// echConfig represents an ECHConfig from the specification,
+// [draft-ietf-tls-esni-22](https://www.ietf.org/archive/id/draft-ietf-tls-esni-22.html).
+type echConfig struct {
+	// "The version of ECH for which this configuration is used.
+	// The version is the same as the code point for the
+	// encrypted_client_hello extension. Clients MUST ignore any
+	// ECHConfig structure with a version they do not support."
+	Version uint16
+
+	// The "length" and "contents" fields defined next in the
+	// structure are implicitly taken care of by cryptobyte
+	// when encoding the following fields:
+
+	// HpkeKeyConfig fields:
+	ConfigID     uint8
+	KEMID        hpke.KEM
+	PublicKey    kem.PublicKey
+	CipherSuites []hpkeSymmetricCipherSuite
+
+	// ECHConfigContents fields:
+	MaxNameLength uint8
+	RawPublicName string
+	RawExtensions []byte
+
+	// these fields are not part of the spec, but are here for
+	// our use when setting up TLS servers or maintenance
+	configBin   []byte
+	privKeyBin  []byte
+	meta        echConfigMeta
+	sendAsRetry bool
+}
+
+func (echCfg echConfig) MarshalBinary() ([]byte, error) {
+	var b cryptobyte.Builder
+	if err := echCfg.marshalBinary(&b); err != nil {
+		return nil, err
+	}
+	return b.Bytes()
+}
+
+// UnmarshalBinary decodes the data back into an ECH config.
+//
+// Borrowed from github.com/OmarTariq612/goech with modifications.
+// Original code: Copyright (c) 2023 Omar Tariq AbdEl-Raziq
+func (echCfg *echConfig) UnmarshalBinary(data []byte) error {
+	var content cryptobyte.String
+	b := cryptobyte.String(data)
+
+	if !b.ReadUint16(&echCfg.Version) {
+		return errInvalidLen
+	}
+	if echCfg.Version != draftTLSESNI22 {
+		return fmt.Errorf("supported version must be %d: got %d", draftTLSESNI22, echCfg.Version)
+	}
+
+	if !b.ReadUint16LengthPrefixed(&content) || !b.Empty() {
+		return errInvalidLen
+	}
+
+	var t cryptobyte.String
+	var pk []byte
+
+	if !content.ReadUint8(&echCfg.ConfigID) ||
+		!content.ReadUint16((*uint16)(&echCfg.KEMID)) ||
+		!content.ReadUint16LengthPrefixed(&t) ||
+		!t.ReadBytes(&pk, len(t)) ||
+		!content.ReadUint16LengthPrefixed(&t) ||
+		len(t)%4 != 0 /* the length of (KDFs and AEADs) must be divisible by 4 */ {
+		return errInvalidLen
+	}
+
+	if !echCfg.KEMID.IsValid() {
+		return fmt.Errorf("invalid KEM ID: %d", echCfg.KEMID)
+	}
+
+	var err error
+	if echCfg.PublicKey, err = echCfg.KEMID.Scheme().UnmarshalBinaryPublicKey(pk); err != nil {
+		return fmt.Errorf("parsing public_key: %w", err)
+	}
+
+	echCfg.CipherSuites = echCfg.CipherSuites[:0]
+
+	for !t.Empty() {
+		var hpkeKDF, hpkeAEAD uint16
+		if !t.ReadUint16(&hpkeKDF) || !t.ReadUint16(&hpkeAEAD) {
+			// we have already checked that the length is divisible by 4
+			panic("this must not happen")
+		}
+		if !hpke.KDF(hpkeKDF).IsValid() {
+			return fmt.Errorf("invalid KDF ID: %d", hpkeKDF)
+		}
+		if !hpke.AEAD(hpkeAEAD).IsValid() {
+			return fmt.Errorf("invalid AEAD ID: %d", hpkeAEAD)
+		}
+		echCfg.CipherSuites = append(echCfg.CipherSuites, hpkeSymmetricCipherSuite{
+			KDFID:  hpke.KDF(hpkeKDF),
+			AEADID: hpke.AEAD(hpkeAEAD),
+		})
+	}
+
+	var rawPublicName []byte
+	if !content.ReadUint8(&echCfg.MaxNameLength) ||
+		!content.ReadUint8LengthPrefixed(&t) ||
+		!t.ReadBytes(&rawPublicName, len(t)) ||
+		!content.ReadUint16LengthPrefixed(&t) ||
+		!t.ReadBytes(&echCfg.RawExtensions, len(t)) ||
+		!content.Empty() {
+		return errInvalidLen
+	}
+	echCfg.RawPublicName = string(rawPublicName)
+
+	return nil
+}
+
+var errInvalidLen = errors.New("invalid length")
+
+// marshalBinary writes this config to the cryptobyte builder. If there is an error,
+// it will occur before any writes have happened.
+func (echCfg echConfig) marshalBinary(b *cryptobyte.Builder) error {
+	pk, err := echCfg.PublicKey.MarshalBinary()
+	if err != nil {
+		return err
+	}
+	if l := len(echCfg.RawPublicName); l == 0 || l > 255 {
+		return fmt.Errorf("public name length (%d) must be in the range 1-255", l)
+	}
+
+	b.AddUint16(echCfg.Version)
+	b.AddUint16LengthPrefixed(func(b *cryptobyte.Builder) { // "length" field
+		b.AddUint8(echCfg.ConfigID)
+		b.AddUint16(uint16(echCfg.KEMID))
+		b.AddUint16LengthPrefixed(func(b *cryptobyte.Builder) {
+			b.AddBytes(pk)
+		})
+		b.AddUint16LengthPrefixed(func(b *cryptobyte.Builder) {
+			for _, cs := range echCfg.CipherSuites {
+				b.AddUint16(uint16(cs.KDFID))
+				b.AddUint16(uint16(cs.AEADID))
+			}
+		})
+		b.AddUint8(uint8(min(len(echCfg.RawPublicName)+16, 255)))
+		b.AddUint8LengthPrefixed(func(b *cryptobyte.Builder) {
+			b.AddBytes([]byte(echCfg.RawPublicName))
+		})
+		b.AddUint16LengthPrefixed(func(child *cryptobyte.Builder) {
+			child.AddBytes(echCfg.RawExtensions)
+		})
+	})
+
+	return nil
+}
+
+type hpkeSymmetricCipherSuite struct {
+	KDFID  hpke.KDF
+	AEADID hpke.AEAD
+}
+
+type echConfigList []echConfig
+
+func (cl echConfigList) MarshalBinary() ([]byte, error) {
+	var b cryptobyte.Builder
+	var err error
+
+	// the list's length prefixes the list, as with most opaque values
+	b.AddUint16LengthPrefixed(func(b *cryptobyte.Builder) {
+		for _, cfg := range cl {
+			if err = cfg.marshalBinary(b); err != nil {
+				break
+			}
+		}
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return b.Bytes()
+}
+
+func newECHConfigID(ctx caddy.Context) (uint8, error) {
+	// uint8 can be 0-255 inclusive
+	const uint8Range = 256
+
+	// avoid repeating storage checks
+	tried := make([]bool, uint8Range)
+
+	// Try to find an available number with random rejection sampling;
+	// i.e. choose a random number and see if it's already taken.
+	// The hard limit on how many times we try to find an available
+	// number is flexible... in theory, assuming uniform distribution,
+	// 256 attempts should make each possible value show up exactly
+	// once, but obviously that won't be the case. We can try more
+	// times to try to ensure that every number gets a chance, which
+	// is especially useful if few are available, or we can lower it
+	// if we assume we should have found an available value by then
+	// and want to limit runtime; for now I choose the middle ground
+	// and just try as many times as there are possible values.
+	for i := 0; i < uint8Range && ctx.Err() == nil; i++ {
+		num := uint8(weakrand.N(uint8Range)) //nolint:gosec
+
+		// don't try the same number a second time
+		if tried[num] {
+			continue
+		}
+		tried[num] = true
+
+		// check to see if any of the subkeys use this config ID
+		numStr := strconv.Itoa(int(num))
+		trialPath := path.Join(echConfigsKey, numStr)
+		if ctx.Storage().Exists(ctx, trialPath) {
+			continue
+		}
+
+		return num, nil
+	}
+
+	if err := ctx.Err(); err != nil {
+		return 0, err
+	}
+
+	return 0, fmt.Errorf("depleted attempts to find an available config_id")
+}
+
+// ECHPublisher is an interface for publishing ECHConfigList values
+// so that they can be used by clients.
+type ECHPublisher interface {
+	// Returns a key that is unique to this publisher and its configuration.
+	// A publisher's ID combined with its config is a valid key.
+	// It is used to prevent duplicating publications.
+	PublisherKey() string
+
+	// Publishes the ECH config list for the given innerNames. Some publishers
+	// may not need a list of inner/protected names, and can ignore the argument;
+	// most, however, will want to use it to know which inner names are to be
+	// associated with the given ECH config list.
+	PublishECHConfigList(ctx context.Context, innerNames []string, echConfigList []byte) error
+}
+
+type echConfigMeta struct {
+	Created      time.Time          `json:"created"`
+	Publications publicationHistory `json:"publications"`
+}
+
+// publicationHistory is a map of publisher key to
+// map of inner name to timestamp
+type publicationHistory map[string]map[string]time.Time
+
+// The key prefix when putting ECH configs in storage. After this
+// comes the config ID.
+const echConfigsKey = "ech/configs"
+
+// https://www.ietf.org/archive/id/draft-ietf-tls-esni-22.html
+const draftTLSESNI22 = 0xfe0d
+
+// Interface guard
+var _ ECHPublisher = (*ECHDNSPublisher)(nil)

modules/caddytls/internalissuer.go

@@ -178,6 +178,9 @@ func (iss *InternalIssuer) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 				return d.ArgErr()
 			}
 			iss.SignWithRoot = true
+
+		default:
+			return d.Errf("unrecognized subdirective '%s'", d.Val())
 		}
 	}
 	return nil

modules/caddytls/matchers.go

@@ -15,6 +15,7 @@
 package caddytls
 
 import (
+	"context"
 	"crypto/tls"
 	"fmt"
 	"net"
@@ -55,7 +56,7 @@ func (MatchServerName) CaddyModule() caddy.ModuleInfo {
 
 // Match matches hello based on SNI.
 func (m MatchServerName) Match(hello *tls.ClientHelloInfo) bool {
-	repl := caddy.NewReplacer()
+	var repl *caddy.Replacer
 	// caddytls.TestServerNameMatcher calls this function without any context
 	if ctx := hello.Context(); ctx != nil {
 		// In some situations the existing context may have no replacer
@@ -64,6 +65,10 @@ func (m MatchServerName) Match(hello *tls.ClientHelloInfo) bool {
 		}
 	}
 
+	if repl == nil {
+		repl = caddy.NewReplacer()
+	}
+
 	for _, name := range m {
 		rs := repl.ReplaceAll(name, "")
 		if certmagic.MatchWildcard(hello.ServerName, rs) {
@@ -224,15 +229,28 @@ func (MatchServerNameRE) CaddyModule() caddy.ModuleInfo {
 
 // Match matches hello based on SNI using a regular expression.
 func (m MatchServerNameRE) Match(hello *tls.ClientHelloInfo) bool {
-	repl := caddy.NewReplacer()
+	// Note: caddytls.TestServerNameMatcher calls this function without any context
-	// caddytls.TestServerNameMatcher calls this function without any context
+	ctx := hello.Context()
-	if ctx := hello.Context(); ctx != nil {
+	if ctx == nil {
+		// layer4.Connection implements GetContext() to pass its context here,
+		// since hello.Context() returns nil
+		if mayHaveContext, ok := hello.Conn.(interface{ GetContext() context.Context }); ok {
+			ctx = mayHaveContext.GetContext()
+		}
+	}
+
+	var repl *caddy.Replacer
+	if ctx != nil {
 		// In some situations the existing context may have no replacer
 		if replAny := ctx.Value(caddy.ReplacerCtxKey); replAny != nil {
 			repl = replAny.(*caddy.Replacer)
 		}
 	}
 
+	if repl == nil {
+		repl = caddy.NewReplacer()
+	}
+
 	return m.MatchRegexp.Match(hello.ServerName, repl)
 }
 

modules/caddytls/tls.go

@@ -20,16 +20,20 @@ import (
 	"encoding/json"
 	"fmt"
 	"log"
+	"net"
 	"net/http"
 	"runtime/debug"
+	"strings"
 	"sync"
 	"time"
 
 	"github.com/caddyserver/certmagic"
+	"github.com/libdns/libdns"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
 
 	"github.com/caddyserver/caddy/v2"
+	"github.com/caddyserver/caddy/v2/internal"
 	"github.com/caddyserver/caddy/v2/modules/caddyevents"
 )
 
@@ -52,8 +56,10 @@ type TLS struct {
 	//
 	// The "automate" certificate loader module can be used to
 	// specify a list of subjects that need certificates to be
-	// managed automatically. The first matching automation
+	// managed automatically, including subdomains that may
-	// policy will be applied to manage the certificate(s).
+	// already be covered by a managed wildcard certificate.
+	// The first matching automation policy will be used
+	// to manage automated certificate(s).
 	//
 	// All loaded certificates get pooled
 	// into the same cache and may be used to complete TLS
@@ -79,6 +85,7 @@ type TLS struct {
 	// Disabling OCSP stapling puts clients at greater risk, reduces their
 	// privacy, and usually lowers client performance. It is NOT recommended
 	// to disable this unless you are able to justify the costs.
+	//
 	// EXPERIMENTAL. Subject to change.
 	DisableOCSPStapling bool `json:"disable_ocsp_stapling,omitempty"`
 
@@ -89,6 +96,7 @@ type TLS struct {
 	//
 	// Disabling these checks should only be done when the storage
 	// can be trusted to have enough capacity and no other problems.
+	//
 	// EXPERIMENTAL. Subject to change.
 	DisableStorageCheck bool `json:"disable_storage_check,omitempty"`
 
@@ -100,17 +108,34 @@ type TLS struct {
 	// The instance.uuid file is used to identify the instance of Caddy
 	// in a cluster. The last_clean.json file is used to store the last
 	// time the storage was cleaned.
+	//
 	// EXPERIMENTAL. Subject to change.
 	DisableStorageClean bool `json:"disable_storage_clean,omitempty"`
 
+	// Enable Encrypted ClientHello (ECH). ECH protects the server name
+	// (SNI) and other sensitive parameters of a normally-plaintext TLS
+	// ClientHello during a handshake.
+	//
+	// EXPERIMENTAL: Subject to change.
+	EncryptedClientHello *ECH `json:"encrypted_client_hello,omitempty"`
+
+	// The default DNS provider module to use when a DNS module is needed.
+	//
+	// EXPERIMENTAL: Subject to change.
+	DNSRaw json.RawMessage `json:"dns,omitempty" caddy:"namespace=dns.providers inline_key=name"`
+	dns    any             // technically, it should be any/all of the libdns interfaces (RecordSetter, RecordAppender, etc.)
+
 	certificateLoaders []CertificateLoader
-	automateNames      []string
+	automateNames      map[string]struct{}
 	ctx                caddy.Context
 	storageCleanTicker *time.Ticker
 	storageCleanStop   chan struct{}
 	logger             *zap.Logger
 	events             *caddyevents.App
 
+	serverNames   map[string]struct{}
+	serverNamesMu *sync.Mutex
+
 	// set of subjects with managed certificates,
 	// and hashes of manually-loaded certificates
 	// (managing's value is an optional issuer key, for distinction)
@@ -136,6 +161,29 @@ func (t *TLS) Provision(ctx caddy.Context) error {
 	t.logger = ctx.Logger()
 	repl := caddy.NewReplacer()
 	t.managing, t.loaded = make(map[string]string), make(map[string]string)
+	t.serverNames = make(map[string]struct{})
+	t.serverNamesMu = new(sync.Mutex)
+
+	// set up default DNS module, if any, and make sure it implements all the
+	// common libdns interfaces, since it could be used for a variety of things
+	// (do this before provisioning other modules, since they may rely on this)
+	if len(t.DNSRaw) > 0 {
+		dnsMod, err := ctx.LoadModule(t, "DNSRaw")
+		if err != nil {
+			return fmt.Errorf("loading overall DNS provider module: %v", err)
+		}
+		switch dnsMod.(type) {
+		case interface {
+			libdns.RecordAppender
+			libdns.RecordDeleter
+			libdns.RecordGetter
+			libdns.RecordSetter
+		}:
+		default:
+			return fmt.Errorf("DNS module does not implement the most common libdns interfaces: %T", dnsMod)
+		}
+		t.dns = dnsMod
+	}
 
 	// set up a new certificate cache; this (re)loads all certificates
 	cacheOpts := certmagic.CacheOptions{
@@ -173,12 +221,13 @@ func (t *TLS) Provision(ctx caddy.Context) error {
 			// special case; these will be loaded in later using our automation facilities,
 			// which we want to avoid doing during provisioning
 			if automateNames, ok := modIface.(*AutomateLoader); ok && automateNames != nil {
-				repl := caddy.NewReplacer()
+				if t.automateNames == nil {
-				subjects := make([]string, len(*automateNames))
+					t.automateNames = make(map[string]struct{})
-				for i, sub := range *automateNames {
+				}
-					subjects[i] = repl.ReplaceAll(sub, "")
+				repl := caddy.NewReplacer()
+				for _, sub := range *automateNames {
+					t.automateNames[repl.ReplaceAll(sub, "")] = struct{}{}
 				}
-				t.automateNames = subjects
 			} else {
 				return fmt.Errorf("loading certificates with 'automate' requires array of strings, got: %T", modIface)
 			}
@@ -187,74 +236,8 @@ func (t *TLS) Provision(ctx caddy.Context) error {
 		t.certificateLoaders = append(t.certificateLoaders, modIface.(CertificateLoader))
 	}
 
-	// on-demand permission module
+	// using the certificate loaders we just initialized, load
-	if t.Automation != nil && t.Automation.OnDemand != nil && t.Automation.OnDemand.PermissionRaw != nil {
+	// manual/static (unmanaged) certificates - we do this in
-		if t.Automation.OnDemand.Ask != "" {
-			return fmt.Errorf("on-demand TLS config conflict: both 'ask' endpoint and a 'permission' module are specified; 'ask' is deprecated, so use only the permission module")
-		}
-		val, err := ctx.LoadModule(t.Automation.OnDemand, "PermissionRaw")
-		if err != nil {
-			return fmt.Errorf("loading on-demand TLS permission module: %v", err)
-		}
-		t.Automation.OnDemand.permission = val.(OnDemandPermission)
-	}
-
-	// run replacer on ask URL (for environment variables) -- return errors to prevent surprises (#5036)
-	if t.Automation != nil && t.Automation.OnDemand != nil && t.Automation.OnDemand.Ask != "" {
-		t.Automation.OnDemand.Ask, err = repl.ReplaceOrErr(t.Automation.OnDemand.Ask, true, true)
-		if err != nil {
-			return fmt.Errorf("preparing 'ask' endpoint: %v", err)
-		}
-		perm := PermissionByHTTP{
-			Endpoint: t.Automation.OnDemand.Ask,
-		}
-		if err := perm.Provision(ctx); err != nil {
-			return fmt.Errorf("provisioning 'ask' module: %v", err)
-		}
-		t.Automation.OnDemand.permission = perm
-	}
-
-	// automation/management policies
-	if t.Automation == nil {
-		t.Automation = new(AutomationConfig)
-	}
-	t.Automation.defaultPublicAutomationPolicy = new(AutomationPolicy)
-	err = t.Automation.defaultPublicAutomationPolicy.Provision(t)
-	if err != nil {
-		return fmt.Errorf("provisioning default public automation policy: %v", err)
-	}
-	for _, n := range t.automateNames {
-		// if any names specified by the "automate" loader do not qualify for a public
-		// certificate, we should initialize a default internal automation policy
-		// (but we don't want to do this unnecessarily, since it may prompt for password!)
-		if certmagic.SubjectQualifiesForPublicCert(n) {
-			continue
-		}
-		t.Automation.defaultInternalAutomationPolicy = &AutomationPolicy{
-			IssuersRaw: []json.RawMessage{json.RawMessage(`{"module":"internal"}`)},
-		}
-		err = t.Automation.defaultInternalAutomationPolicy.Provision(t)
-		if err != nil {
-			return fmt.Errorf("provisioning default internal automation policy: %v", err)
-		}
-		break
-	}
-	for i, ap := range t.Automation.Policies {
-		err := ap.Provision(t)
-		if err != nil {
-			return fmt.Errorf("provisioning automation policy %d: %v", i, err)
-		}
-	}
-
-	// session ticket ephemeral keys (STEK) service and provider
-	if t.SessionTickets != nil {
-		err := t.SessionTickets.provision(ctx)
-		if err != nil {
-			return fmt.Errorf("provisioning session tickets configuration: %v", err)
-		}
-	}
-
-	// load manual/static (unmanaged) certificates - we do this in
 	// provision so that other apps (such as http) can know which
 	// certificates have been manually loaded, and also so that
 	// commands like validate can be a better test
@@ -283,6 +266,95 @@ func (t *TLS) Provision(ctx caddy.Context) error {
 		}
 	}
 
+	// on-demand permission module
+	if t.Automation != nil && t.Automation.OnDemand != nil && t.Automation.OnDemand.PermissionRaw != nil {
+		if t.Automation.OnDemand.Ask != "" {
+			return fmt.Errorf("on-demand TLS config conflict: both 'ask' endpoint and a 'permission' module are specified; 'ask' is deprecated, so use only the permission module")
+		}
+		val, err := ctx.LoadModule(t.Automation.OnDemand, "PermissionRaw")
+		if err != nil {
+			return fmt.Errorf("loading on-demand TLS permission module: %v", err)
+		}
+		t.Automation.OnDemand.permission = val.(OnDemandPermission)
+	}
+
+	// automation/management policies
+	if t.Automation == nil {
+		t.Automation = new(AutomationConfig)
+	}
+	t.Automation.defaultPublicAutomationPolicy = new(AutomationPolicy)
+	err = t.Automation.defaultPublicAutomationPolicy.Provision(t)
+	if err != nil {
+		return fmt.Errorf("provisioning default public automation policy: %v", err)
+	}
+	for n := range t.automateNames {
+		// if any names specified by the "automate" loader do not qualify for a public
+		// certificate, we should initialize a default internal automation policy
+		// (but we don't want to do this unnecessarily, since it may prompt for password!)
+		if certmagic.SubjectQualifiesForPublicCert(n) {
+			continue
+		}
+		t.Automation.defaultInternalAutomationPolicy = &AutomationPolicy{
+			IssuersRaw: []json.RawMessage{json.RawMessage(`{"module":"internal"}`)},
+		}
+		err = t.Automation.defaultInternalAutomationPolicy.Provision(t)
+		if err != nil {
+			return fmt.Errorf("provisioning default internal automation policy: %v", err)
+		}
+		break
+	}
+	for i, ap := range t.Automation.Policies {
+		err := ap.Provision(t)
+		if err != nil {
+			return fmt.Errorf("provisioning automation policy %d: %v", i, err)
+		}
+	}
+
+	// run replacer on ask URL (for environment variables) -- return errors to prevent surprises (#5036)
+	if t.Automation != nil && t.Automation.OnDemand != nil && t.Automation.OnDemand.Ask != "" {
+		t.Automation.OnDemand.Ask, err = repl.ReplaceOrErr(t.Automation.OnDemand.Ask, true, true)
+		if err != nil {
+			return fmt.Errorf("preparing 'ask' endpoint: %v", err)
+		}
+		perm := PermissionByHTTP{
+			Endpoint: t.Automation.OnDemand.Ask,
+		}
+		if err := perm.Provision(ctx); err != nil {
+			return fmt.Errorf("provisioning 'ask' module: %v", err)
+		}
+		t.Automation.OnDemand.permission = perm
+	}
+
+	// session ticket ephemeral keys (STEK) service and provider
+	if t.SessionTickets != nil {
+		err := t.SessionTickets.provision(ctx)
+		if err != nil {
+			return fmt.Errorf("provisioning session tickets configuration: %v", err)
+		}
+	}
+
+	// ECH (Encrypted ClientHello) initialization
+	if t.EncryptedClientHello != nil {
+		t.EncryptedClientHello.configs = make(map[string][]echConfig)
+		outerNames, err := t.EncryptedClientHello.Provision(ctx)
+		if err != nil {
+			return fmt.Errorf("provisioning Encrypted ClientHello components: %v", err)
+		}
+
+		// outer names should have certificates to reduce client brittleness
+		for _, outerName := range outerNames {
+			if outerName == "" {
+				continue
+			}
+			if !t.HasCertificateForSubject(outerName) {
+				if t.automateNames == nil {
+					t.automateNames = make(map[string]struct{})
+				}
+				t.automateNames[outerName] = struct{}{}
+			}
+		}
+	}
+
 	return nil
 }
 
@@ -339,6 +411,16 @@ func (t *TLS) Start() error {
 		return fmt.Errorf("automate: managing %v: %v", t.automateNames, err)
 	}
 
+	// publish ECH configs in the background; does not need to block
+	// server startup, as it could take a while
+	if t.EncryptedClientHello != nil {
+		go func() {
+			if err := t.publishECHConfigs(); err != nil {
+				t.logger.Named("ech").Error("publication(s) failed", zap.Error(err))
+			}
+		}()
+	}
+
 	if !t.DisableStorageClean {
 		// start the storage cleaner goroutine and ticker,
 		// which cleans out expired certificates and more
@@ -377,7 +459,8 @@ func (t *TLS) Cleanup() error {
 		// app instance (which is being stopped) that are not managed or loaded by the
 		// new app instance (which just started), and remove them from the cache
 		var noLongerManaged []certmagic.SubjectIssuer
-		var reManage, noLongerLoaded []string
+		var noLongerLoaded []string
+		reManage := make(map[string]struct{})
 		for subj, currentIssuerKey := range t.managing {
 			// It's a bit nuanced: managed certs can sometimes be different enough that we have to
 			// swap them out for a different one, even if they are for the same subject/domain.
@@ -395,7 +478,7 @@ func (t *TLS) Cleanup() error {
 
 				// then, if the next app is managing a cert for this name, but with a different issuer, re-manage it
 				if ok && nextIssuerKey != currentIssuerKey {
-					reManage = append(reManage, subj)
+					reManage[subj] = struct{}{}
 				}
 			}
 		}
@@ -416,33 +499,52 @@ func (t *TLS) Cleanup() error {
 		if err := nextTLSApp.Manage(reManage); err != nil {
 			if c := t.logger.Check(zapcore.ErrorLevel, "re-managing unloaded certificates with new config"); c != nil {
 				c.Write(
-					zap.Strings("subjects", reManage),
+					zap.Strings("subjects", internal.MaxSizeSubjectsListForLog(reManage, 1000)),
 					zap.Error(err),
 				)
 			}
 		}
 	} else {
-		// no more TLS app running, so delete in-memory cert cache
+		// no more TLS app running, so delete in-memory cert cache, if it was created yet
-		certCache.Stop()
+		certCacheMu.RLock()
-		certCacheMu.Lock()
+		hasCache := certCache != nil
-		certCache = nil
+		certCacheMu.RUnlock()
-		certCacheMu.Unlock()
+		if hasCache {
+			certCache.Stop()
+			certCacheMu.Lock()
+			certCache = nil
+			certCacheMu.Unlock()
+		}
 	}
 
 	return nil
 }
 
-// Manage immediately begins managing names according to the
+// Manage immediately begins managing subjects according to the
-// matching automation policy.
+// matching automation policy. The subjects are given in a map
-func (t *TLS) Manage(names []string) error {
+// to prevent duplication and also because quick lookups are
+// needed to assess wildcard coverage, if any, depending on
+// certain config parameters (with lots of subjects, computing
+// wildcard coverage over a slice can be highly inefficient).
+func (t *TLS) Manage(subjects map[string]struct{}) error {
 	// for a large number of names, we can be more memory-efficient
 	// by making only one certmagic.Config for all the names that
 	// use that config, rather than calling ManageAsync once for
 	// every name; so first, bin names by AutomationPolicy
 	policyToNames := make(map[*AutomationPolicy][]string)
-	for _, name := range names {
+	for subj := range subjects {
-		ap := t.getAutomationPolicyForName(name)
+		ap := t.getAutomationPolicyForName(subj)
-		policyToNames[ap] = append(policyToNames[ap], name)
+		// by default, if a wildcard that covers the subj is also being
+		// managed, either by a previous call to Manage or by this one,
+		// prefer using that over individual certs for its subdomains;
+		// but users can disable this and force getting a certificate for
+		// subdomains by adding the name to the 'automate' cert loader
+		if t.managingWildcardFor(subj, subjects) {
+			if _, ok := t.automateNames[subj]; !ok {
+				continue
+			}
+		}
+		policyToNames[ap] = append(policyToNames[ap], subj)
 	}
 
 	// now that names are grouped by policy, we can simply make one
@@ -453,7 +555,7 @@ func (t *TLS) Manage(names []string) error {
 		if err != nil {
 			const maxNamesToDisplay = 100
 			if len(names) > maxNamesToDisplay {
-				names = append(names[:maxNamesToDisplay], fmt.Sprintf("(%d more...)", len(names)-maxNamesToDisplay))
+				names = append(names[:maxNamesToDisplay], fmt.Sprintf("(and %d more...)", len(names)-maxNamesToDisplay))
 			}
 			return fmt.Errorf("automate: manage %v: %v", names, err)
 		}
@@ -478,6 +580,66 @@ func (t *TLS) Manage(names []string) error {
 	return nil
 }
 
+// managingWildcardFor returns true if the app is managing a certificate that covers that
+// subject name (including consideration of wildcards), either from its internal list of
+// names that it IS managing certs for, or from the otherSubjsToManage which includes names
+// that WILL be managed.
+func (t *TLS) managingWildcardFor(subj string, otherSubjsToManage map[string]struct{}) bool {
+	// TODO: we could also consider manually-loaded certs using t.HasCertificateForSubject(),
+	// but that does not account for how manually-loaded certs may be restricted as to which
+	// hostnames or ClientHellos they can be used with by tags, etc; I don't *think* anyone
+	// necessarily wants this anyway, but I thought I'd note this here for now (if we did
+	// consider manually-loaded certs, we'd probably want to rename the method since it
+	// wouldn't be just about managed certs anymore)
+
+	// IP addresses must match exactly
+	if ip := net.ParseIP(subj); ip != nil {
+		_, managing := t.managing[subj]
+		return managing
+	}
+
+	// replace labels of the domain with wildcards until we get a match
+	labels := strings.Split(subj, ".")
+	for i := range labels {
+		if labels[i] == "*" {
+			continue
+		}
+		labels[i] = "*"
+		candidate := strings.Join(labels, ".")
+		if _, ok := t.managing[candidate]; ok {
+			return true
+		}
+		if _, ok := otherSubjsToManage[candidate]; ok {
+			return true
+		}
+	}
+
+	return false
+}
+
+// RegisterServerNames registers the provided DNS names with the TLS app.
+// This is currently used to auto-publish Encrypted ClientHello (ECH)
+// configurations, if enabled. Use of this function by apps using the TLS
+// app removes the need for the user to redundantly specify domain names
+// in their configuration. This function separates hostname and port
+// (keeping only the hotsname) and filters IP addresses, which can't be
+// used with ECH.
+//
+// EXPERIMENTAL: This function and its semantics/behavior are subject to change.
+func (t *TLS) RegisterServerNames(dnsNames []string) {
+	t.serverNamesMu.Lock()
+	for _, name := range dnsNames {
+		host, _, err := net.SplitHostPort(name)
+		if err != nil {
+			host = name
+		}
+		if strings.TrimSpace(host) != "" && !certmagic.SubjectIsIP(host) {
+			t.serverNames[strings.ToLower(host)] = struct{}{}
+		}
+	}
+	t.serverNamesMu.Unlock()
+}
+
 // HandleHTTPChallenge ensures that the ACME HTTP challenge or ZeroSSL HTTP
 // validation request is handled for the certificate named by r.Host, if it
 // is an HTTP challenge request. It requires that the automation policy for

modules/caddytls/values.go

@@ -81,13 +81,15 @@ func getOptimalDefaultCipherSuites() []uint16 {
 	return defaultCipherSuitesWithoutAESNI
 }
 
-// SupportedCurves is the unordered map of supported curves.
+// SupportedCurves is the unordered map of supported curves
+// or key exchange mechanisms ("curves" traditionally).
 // https://golang.org/pkg/crypto/tls/#CurveID
 var SupportedCurves = map[string]tls.CurveID{
-	"x25519":    tls.X25519,
+	"x25519mlkem768": tls.X25519MLKEM768,
-	"secp256r1": tls.CurveP256,
+	"x25519":         tls.X25519,
-	"secp384r1": tls.CurveP384,
+	"secp256r1":      tls.CurveP256,
-	"secp521r1": tls.CurveP521,
+	"secp384r1":      tls.CurveP384,
+	"secp521r1":      tls.CurveP521,
 }
 
 // supportedCertKeyTypes is all the key types that are supported
@@ -100,20 +102,16 @@ var supportedCertKeyTypes = map[string]certmagic.KeyType{
 	"ed25519": certmagic.ED25519,
 }
 
-// defaultCurves is the list of only the curves we want to use
+// defaultCurves is the list of only the curves or key exchange
-// by default, in descending order of preference.
+// mechanisms we want to use by default. The order is irrelevant.
 //
-// This list should only include curves which are fast by design
+// This list should only include mechanisms which are fast by
-// (e.g. X25519) and those for which an optimized assembly
+// design (e.g. X25519) and those for which an optimized assembly
 // implementation exists (e.g. P256). The latter ones can be
 // found here:
 // https://github.com/golang/go/tree/master/src/crypto/elliptic
-//
-// Temporily we ignore these default, to take advantage of X25519Kyber768
-// in Go's defaults (X25519Kyber768, X25519, P-256, P-384, P-521), which
-// isn't exported. See https://github.com/caddyserver/caddy/issues/6540
-// nolint:unused
 var defaultCurves = []tls.CurveID{
+	tls.X25519MLKEM768,
 	tls.X25519,
 	tls.CurveP256,
 }

modules/internal/network/networkproxy.go

@@ -0,0 +1,144 @@
+package network
+
+import (
+	"errors"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"go.uber.org/zap"
+
+	"github.com/caddyserver/caddy/v2"
+	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
+)
+
+func init() {
+	caddy.RegisterModule(ProxyFromURL{})
+	caddy.RegisterModule(ProxyFromNone{})
+}
+
+// The "url" proxy source uses the defined URL as the proxy
+type ProxyFromURL struct {
+	URL string `json:"url"`
+
+	ctx    caddy.Context
+	logger *zap.Logger
+}
+
+// CaddyModule implements Module.
+func (p ProxyFromURL) CaddyModule() caddy.ModuleInfo {
+	return caddy.ModuleInfo{
+		ID: "caddy.network_proxy.url",
+		New: func() caddy.Module {
+			return &ProxyFromURL{}
+		},
+	}
+}
+
+func (p *ProxyFromURL) Provision(ctx caddy.Context) error {
+	p.ctx = ctx
+	p.logger = ctx.Logger()
+	return nil
+}
+
+// Validate implements Validator.
+func (p ProxyFromURL) Validate() error {
+	if _, err := url.Parse(p.URL); err != nil {
+		return err
+	}
+	return nil
+}
+
+// ProxyFunc implements ProxyFuncProducer.
+func (p ProxyFromURL) ProxyFunc() func(*http.Request) (*url.URL, error) {
+	if strings.Contains(p.URL, "{") && strings.Contains(p.URL, "}") {
+		// courtesy of @ImpostorKeanu: https://github.com/caddyserver/caddy/pull/6397
+		return func(r *http.Request) (*url.URL, error) {
+			// retrieve the replacer from context.
+			repl, ok := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
+			if !ok {
+				err := errors.New("failed to obtain replacer from request")
+				p.logger.Error(err.Error())
+				return nil, err
+			}
+
+			// apply placeholders to the value
+			// note: h.ForwardProxyURL should never be empty at this point
+			s := repl.ReplaceAll(p.URL, "")
+			if s == "" {
+				p.logger.Error("network_proxy URL was empty after applying placeholders",
+					zap.String("initial_value", p.URL),
+					zap.String("final_value", s),
+					zap.String("hint", "check for invalid placeholders"))
+				return nil, errors.New("empty value for network_proxy URL")
+			}
+
+			// parse the url
+			pUrl, err := url.Parse(s)
+			if err != nil {
+				p.logger.Warn("failed to derive transport proxy from network_proxy URL")
+				pUrl = nil
+			} else if pUrl.Host == "" || strings.Split("", pUrl.Host)[0] == ":" {
+				// url.Parse does not return an error on these values:
+				//
+				// - http://:80
+				//   - pUrl.Host == ":80"
+				// - /some/path
+				//   - pUrl.Host == ""
+				//
+				// Super edge cases, but humans are human.
+				err = errors.New("supplied network_proxy URL is missing a host value")
+				pUrl = nil
+			} else {
+				p.logger.Debug("setting transport proxy url", zap.String("url", s))
+			}
+
+			return pUrl, err
+		}
+	}
+	return func(r *http.Request) (*url.URL, error) {
+		return url.Parse(p.URL)
+	}
+}
+
+// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
+func (p *ProxyFromURL) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
+	d.Next()
+	d.Next()
+	p.URL = d.Val()
+	return nil
+}
+
+// The "none" proxy source module disables the use of network proxy.
+type ProxyFromNone struct{}
+
+func (p ProxyFromNone) CaddyModule() caddy.ModuleInfo {
+	return caddy.ModuleInfo{
+		ID: "caddy.network_proxy.none",
+		New: func() caddy.Module {
+			return &ProxyFromNone{}
+		},
+	}
+}
+
+// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
+func (p ProxyFromNone) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
+	return nil
+}
+
+// ProxyFunc implements ProxyFuncProducer.
+func (p ProxyFromNone) ProxyFunc() func(*http.Request) (*url.URL, error) {
+	return nil
+}
+
+var (
+	_ caddy.Module            = ProxyFromURL{}
+	_ caddy.Provisioner       = (*ProxyFromURL)(nil)
+	_ caddy.Validator         = ProxyFromURL{}
+	_ caddy.ProxyFuncProducer = ProxyFromURL{}
+	_ caddyfile.Unmarshaler   = (*ProxyFromURL)(nil)
+
+	_ caddy.Module            = ProxyFromNone{}
+	_ caddy.ProxyFuncProducer = ProxyFromNone{}
+	_ caddyfile.Unmarshaler   = ProxyFromNone{}
+)

modules/logging/filewriter.go

@@ -313,6 +313,9 @@ func (fw *FileWriter) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 				return d.Errf("negative roll_keep_for duration: %v", keepFor)
 			}
 			fw.RollKeepDays = int(math.Ceil(keepFor.Hours() / 24))
+
+		default:
+			return d.Errf("unrecognized subdirective '%s'", d.Val())
 		}
 	}
 	return nil

modules/logging/netwriter.go

@@ -145,6 +145,9 @@ func (nw *NetWriter) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 				return d.ArgErr()
 			}
 			nw.SoftStart = true
+
+		default:
+			return d.Errf("unrecognized subdirective '%s'", d.Val())
 		}
 	}
 	return nil