mirror of
https://github.com/caddyserver/caddy.git
synced 2025-11-03 19:17:29 -05:00
318 lines
10 KiB
Go
318 lines
10 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package reverseproxy
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"strconv"
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"strings"
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"github.com/spf13/cobra"
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"go.uber.org/zap"
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caddycmd "github.com/caddyserver/caddy/v2/cmd"
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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/caddy/v2/caddyconfig"
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"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp/headers"
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"github.com/caddyserver/caddy/v2/modules/caddytls"
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)
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func init() {
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caddycmd.RegisterCommand(caddycmd.Command{
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Name: "reverse-proxy",
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Usage: `[--from <addr>] [--to <addr>] [--change-host-header] [--insecure] [--internal-certs] [--disable-redirects] [--header-up "Field: value"] [--header-down "Field: value"] [--access-log] [--debug]`,
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Short: "A quick and production-ready reverse proxy",
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Long: `
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A simple but production-ready reverse proxy. Useful for quick deployments,
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demos, and development.
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Simply shuttles HTTP(S) traffic from the --from address to the --to address.
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Multiple --to addresses may be specified by repeating the flag.
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Unless otherwise specified in the addresses, the --from address will be
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assumed to be HTTPS if a hostname is given, and the --to address will be
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assumed to be HTTP.
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If the --from address has a host or IP, Caddy will attempt to serve the
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proxy over HTTPS with a certificate (unless overridden by the HTTP scheme
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or port).
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If serving HTTPS:
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--disable-redirects can be used to avoid binding to the HTTP port.
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--internal-certs can be used to force issuance certs using the internal
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CA instead of attempting to issue a public certificate.
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For proxying:
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--header-up can be used to set a request header to send to the upstream.
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--header-down can be used to set a response header to send back to the client.
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--change-host-header sets the Host header on the request to the address
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of the upstream, instead of defaulting to the incoming Host header.
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This is a shortcut for --header-up "Host: {http.reverse_proxy.upstream.hostport}".
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--insecure disables TLS verification with the upstream. WARNING: THIS
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DISABLES SECURITY BY NOT VERIFYING THE UPSTREAM'S CERTIFICATE.
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`,
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CobraFunc: func(cmd *cobra.Command) {
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cmd.Flags().StringP("from", "f", "localhost", "Address on which to receive traffic")
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cmd.Flags().StringSliceP("to", "t", []string{}, "Upstream address(es) to which traffic should be sent")
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cmd.Flags().BoolP("change-host-header", "c", false, "Set upstream Host header to address of upstream")
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cmd.Flags().BoolP("insecure", "", false, "Disable TLS verification (WARNING: DISABLES SECURITY BY NOT VERIFYING TLS CERTIFICATES!)")
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cmd.Flags().BoolP("disable-redirects", "r", false, "Disable HTTP->HTTPS redirects")
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cmd.Flags().BoolP("internal-certs", "i", false, "Use internal CA for issuing certs")
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cmd.Flags().StringSliceP("header-up", "H", []string{}, "Set a request header to send to the upstream (format: \"Field: value\")")
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cmd.Flags().StringSliceP("header-down", "d", []string{}, "Set a response header to send back to the client (format: \"Field: value\")")
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cmd.Flags().BoolP("access-log", "", false, "Enable the access log")
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cmd.Flags().BoolP("debug", "v", false, "Enable verbose debug logs")
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cmd.RunE = caddycmd.WrapCommandFuncForCobra(cmdReverseProxy)
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},
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})
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}
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func cmdReverseProxy(fs caddycmd.Flags) (int, error) {
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caddy.TrapSignals()
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from := fs.String("from")
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changeHost := fs.Bool("change-host-header")
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insecure := fs.Bool("insecure")
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disableRedir := fs.Bool("disable-redirects")
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internalCerts := fs.Bool("internal-certs")
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accessLog := fs.Bool("access-log")
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debug := fs.Bool("debug")
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httpPort := strconv.Itoa(caddyhttp.DefaultHTTPPort)
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httpsPort := strconv.Itoa(caddyhttp.DefaultHTTPSPort)
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to, err := fs.GetStringSlice("to")
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if err != nil {
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return caddy.ExitCodeFailedStartup, fmt.Errorf("invalid to flag: %v", err)
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}
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if len(to) == 0 {
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return caddy.ExitCodeFailedStartup, fmt.Errorf("--to is required")
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}
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// set up the downstream address; assume missing information from given parts
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fromAddr, err := httpcaddyfile.ParseAddress(from)
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if err != nil {
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return caddy.ExitCodeFailedStartup, fmt.Errorf("invalid downstream address %s: %v", from, err)
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}
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if fromAddr.Path != "" {
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return caddy.ExitCodeFailedStartup, fmt.Errorf("paths are not allowed: %s", from)
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}
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if fromAddr.Scheme == "" {
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if fromAddr.Port == httpPort || fromAddr.Host == "" {
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fromAddr.Scheme = "http"
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} else {
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fromAddr.Scheme = "https"
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}
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}
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if fromAddr.Port == "" {
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if fromAddr.Scheme == "http" {
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fromAddr.Port = httpPort
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} else if fromAddr.Scheme == "https" {
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fromAddr.Port = httpsPort
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}
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}
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// set up the upstream address; assume missing information from given parts
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// mixing schemes isn't supported, so use first defined (if available)
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toAddresses := make([]string, len(to))
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var toScheme string
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for i, toLoc := range to {
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addr, err := parseUpstreamDialAddress(toLoc)
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if err != nil {
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return caddy.ExitCodeFailedStartup, fmt.Errorf("invalid upstream address %s: %v", toLoc, err)
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}
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if addr.scheme != "" && toScheme == "" {
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toScheme = addr.scheme
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}
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toAddresses[i] = addr.dialAddr()
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}
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// proceed to build the handler and server
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ht := HTTPTransport{}
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if toScheme == "https" {
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ht.TLS = new(TLSConfig)
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if insecure {
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ht.TLS.InsecureSkipVerify = true
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}
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}
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upstreamPool := UpstreamPool{}
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for _, toAddr := range toAddresses {
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parsedAddr, err := caddy.ParseNetworkAddress(toAddr)
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if err != nil {
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return caddy.ExitCodeFailedStartup, fmt.Errorf("invalid upstream address %s: %v", toAddr, err)
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}
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if parsedAddr.StartPort == 0 && parsedAddr.EndPort == 0 {
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// unix networks don't have ports
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upstreamPool = append(upstreamPool, &Upstream{
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Dial: toAddr,
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})
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} else {
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// expand a port range into multiple upstreams
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for i := parsedAddr.StartPort; i <= parsedAddr.EndPort; i++ {
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upstreamPool = append(upstreamPool, &Upstream{
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Dial: caddy.JoinNetworkAddress("", parsedAddr.Host, fmt.Sprint(i)),
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})
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}
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}
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}
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handler := Handler{
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TransportRaw: caddyconfig.JSONModuleObject(ht, "protocol", "http", nil),
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Upstreams: upstreamPool,
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}
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// set up header_up
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headerUp, err := fs.GetStringSlice("header-up")
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if err != nil {
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return caddy.ExitCodeFailedStartup, fmt.Errorf("invalid header flag: %v", err)
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}
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if len(headerUp) > 0 {
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reqHdr := make(http.Header)
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for i, h := range headerUp {
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key, val, found := strings.Cut(h, ":")
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key, val = strings.TrimSpace(key), strings.TrimSpace(val)
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if !found || key == "" || val == "" {
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return caddy.ExitCodeFailedStartup, fmt.Errorf("header-up %d: invalid format \"%s\" (expecting \"Field: value\")", i, h)
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}
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reqHdr.Set(key, val)
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}
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handler.Headers = &headers.Handler{
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Request: &headers.HeaderOps{
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Set: reqHdr,
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},
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}
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}
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// set up header_down
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headerDown, err := fs.GetStringSlice("header-down")
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if err != nil {
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return caddy.ExitCodeFailedStartup, fmt.Errorf("invalid header flag: %v", err)
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}
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if len(headerDown) > 0 {
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respHdr := make(http.Header)
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for i, h := range headerDown {
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key, val, found := strings.Cut(h, ":")
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key, val = strings.TrimSpace(key), strings.TrimSpace(val)
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if !found || key == "" || val == "" {
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return caddy.ExitCodeFailedStartup, fmt.Errorf("header-down %d: invalid format \"%s\" (expecting \"Field: value\")", i, h)
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}
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respHdr.Set(key, val)
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}
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if handler.Headers == nil {
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handler.Headers = &headers.Handler{}
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}
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handler.Headers.Response = &headers.RespHeaderOps{
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HeaderOps: &headers.HeaderOps{
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Set: respHdr,
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},
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}
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}
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if changeHost {
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if handler.Headers == nil {
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handler.Headers = &headers.Handler{
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Request: &headers.HeaderOps{
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Set: http.Header{},
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},
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}
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}
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handler.Headers.Request.Set.Set("Host", "{http.reverse_proxy.upstream.hostport}")
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}
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route := caddyhttp.Route{
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HandlersRaw: []json.RawMessage{
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caddyconfig.JSONModuleObject(handler, "handler", "reverse_proxy", nil),
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},
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}
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if fromAddr.Host != "" {
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route.MatcherSetsRaw = []caddy.ModuleMap{
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{
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"host": caddyconfig.JSON(caddyhttp.MatchHost{fromAddr.Host}, nil),
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},
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}
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}
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server := &caddyhttp.Server{
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Routes: caddyhttp.RouteList{route},
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Listen: []string{":" + fromAddr.Port},
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}
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if accessLog {
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server.Logs = &caddyhttp.ServerLogConfig{}
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}
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if fromAddr.Scheme == "http" {
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server.AutoHTTPS = &caddyhttp.AutoHTTPSConfig{Disabled: true}
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} else if disableRedir {
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server.AutoHTTPS = &caddyhttp.AutoHTTPSConfig{DisableRedir: true}
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}
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httpApp := caddyhttp.App{
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Servers: map[string]*caddyhttp.Server{"proxy": server},
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}
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appsRaw := caddy.ModuleMap{
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"http": caddyconfig.JSON(httpApp, nil),
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}
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if internalCerts && fromAddr.Host != "" {
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tlsApp := caddytls.TLS{
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Automation: &caddytls.AutomationConfig{
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Policies: []*caddytls.AutomationPolicy{{
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SubjectsRaw: []string{fromAddr.Host},
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IssuersRaw: []json.RawMessage{json.RawMessage(`{"module":"internal"}`)},
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}},
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},
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}
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appsRaw["tls"] = caddyconfig.JSON(tlsApp, nil)
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}
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var false bool
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cfg := &caddy.Config{
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Admin: &caddy.AdminConfig{
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Disabled: true,
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Config: &caddy.ConfigSettings{
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Persist: &false,
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},
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},
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AppsRaw: appsRaw,
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}
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if debug {
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cfg.Logging = &caddy.Logging{
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Logs: map[string]*caddy.CustomLog{
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"default": {BaseLog: caddy.BaseLog{Level: zap.DebugLevel.CapitalString()}},
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},
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}
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}
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err = caddy.Run(cfg)
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if err != nil {
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return caddy.ExitCodeFailedStartup, err
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}
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caddy.Log().Info("caddy proxying", zap.String("from", fromAddr.String()), zap.Strings("to", toAddresses))
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if len(toAddresses) > 1 {
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caddy.Log().Info("using default load balancing policy", zap.String("policy", "random"))
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}
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select {}
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}
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