mirror of
https://github.com/caddyserver/caddy.git
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120 lines
3.7 KiB
Go
120 lines
3.7 KiB
Go
// Copyright 2015 Light Code Labs, LLC
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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 caddytls
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import (
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"crypto/tls"
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"encoding/json"
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"fmt"
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"log"
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"net/http"
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"net/http/httputil"
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"net/url"
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"os"
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"strings"
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"github.com/xenolf/lego/acmev2"
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)
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const challengeBasePath = "/.well-known/acme-challenge"
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// HTTPChallengeHandler proxies challenge requests to ACME client if the
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// request path starts with challengeBasePath, if the HTTP challenge is not
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// disabled, and if we are known to be obtaining a certificate for the name.
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// It returns true if it handled the request and no more needs to be done;
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// it returns false if this call was a no-op and the request still needs handling.
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func HTTPChallengeHandler(w http.ResponseWriter, r *http.Request, listenHost string) bool {
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if !strings.HasPrefix(r.URL.Path, challengeBasePath) {
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return false
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}
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if DisableHTTPChallenge {
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return false
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}
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// see if another instance started the HTTP challenge for this name
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if tryDistributedChallengeSolver(w, r) {
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return true
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}
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// otherwise, if we aren't getting the name, then ignore this challenge
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if !namesObtaining.Has(r.Host) {
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return false
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}
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scheme := "http"
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if r.TLS != nil {
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scheme = "https"
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}
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if listenHost == "" {
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listenHost = "localhost"
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}
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// always proxy to the DefaultHTTPAlternatePort because obviously the
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// ACME challenge request already got into one of our HTTP handlers, so
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// it means we must have started a HTTP listener on the alternate
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// port instead; which is only accessible via listenHost
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upstream, err := url.Parse(fmt.Sprintf("%s://%s:%s", scheme, listenHost, DefaultHTTPAlternatePort))
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if err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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log.Printf("[ERROR] ACME proxy handler: %v", err)
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return true
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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},
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}
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proxy.ServeHTTP(w, r)
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return true
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}
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// tryDistributedChallengeSolver checks to see if this challenge
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// request was initiated by another instance that shares file
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// storage, and attempts to complete the challenge for it. It
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// returns true if the challenge was handled; false otherwise.
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func tryDistributedChallengeSolver(w http.ResponseWriter, r *http.Request) bool {
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filePath := distributedHTTPSolver{}.challengeTokensPath(r.Host)
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f, err := os.Open(filePath)
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if err != nil {
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if !os.IsNotExist(err) {
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log.Printf("[ERROR][%s] Opening distributed challenge token file: %v", r.Host, err)
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}
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return false
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}
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defer f.Close()
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var chalInfo challengeInfo
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err = json.NewDecoder(f).Decode(&chalInfo)
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if err != nil {
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log.Printf("[ERROR][%s] Decoding challenge token file %s (corrupted?): %v", r.Host, filePath, err)
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return false
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}
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// this part borrowed from xenolf/lego's built-in HTTP-01 challenge solver (March 2018)
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challengeReqPath := acme.HTTP01ChallengePath(chalInfo.Token)
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if r.URL.Path == challengeReqPath &&
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strings.HasPrefix(r.Host, chalInfo.Domain) &&
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r.Method == "GET" {
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w.Header().Add("Content-Type", "text/plain")
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w.Write([]byte(chalInfo.KeyAuth))
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r.Close = true
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log.Printf("[INFO][%s] Served key authentication", chalInfo.Domain)
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return true
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}
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return false
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}
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