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d18cf12f14
By chaining in a middleware handler and using newly exposed hooks from the acme package, we're able to proxy ACME requests on port 443 to the ACME client listening on a different port.
68 lines
2.1 KiB
Go
68 lines
2.1 KiB
Go
package letsencrypt
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import (
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"crypto/tls"
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"net/http"
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"net/http/httputil"
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"net/url"
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"sync"
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"sync/atomic"
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"github.com/mholt/caddy/middleware"
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)
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// Handler is a Caddy middleware that can proxy ACME requests
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// to the real ACME endpoint. This is necessary to renew certificates
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// while the server is running. Obviously, a site served on port
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// 443 (HTTPS) binds to that port, so another listener created by
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// our acme client can't bind successfully and solve the challenge.
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// Thus, we chain this handler in so that it can, when activated,
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// proxy ACME requests to an ACME client listening on an alternate
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// port.
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type Handler struct {
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sync.Mutex // protects the ChallengePath property
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Next middleware.Handler
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ChallengeActive int32 // use sync/atomic for speed to set/get this flag
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ChallengePath string // the exact request path to match before proxying
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}
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// ServeHTTP is basically a no-op unless an ACME challenge is active on this host
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// and the request path matches the expected path exactly.
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func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
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// Only if challenge is active
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if atomic.LoadInt32(&h.ChallengeActive) == 1 {
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h.Lock()
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path := h.ChallengePath
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h.Unlock()
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// Request path must be correct; if so, proxy to ACME client
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if r.URL.Path == path {
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upstream, err := url.Parse("https://" + r.Host + ":" + alternatePort)
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if err != nil {
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return http.StatusInternalServerError, err
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}
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proxy := httputil.NewSingleHostReverseProxy(upstream)
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proxy.Transport = &http.Transport{
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TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, // client uses self-signed cert
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}
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proxy.ServeHTTP(w, r)
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return 0, nil
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}
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}
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return h.Next.ServeHTTP(w, r)
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}
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// ChallengeOn enables h to proxy ACME requests.
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func (h *Handler) ChallengeOn(challengePath string) {
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h.Lock()
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h.ChallengePath = challengePath
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h.Unlock()
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atomic.StoreInt32(&h.ChallengeActive, 1)
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}
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// ChallengeOff disables ACME proxying from this h.
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func (h *Handler) ChallengeOff(success bool) {
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atomic.StoreInt32(&h.ChallengeActive, 0)
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}
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