Make the local DoH path configurable

Author: jedisct1

dnscrypt-proxy/config.go

@@ -192,6 +192,7 @@ type BrokenImplementationsConfig struct {
 
 type LocalDoHConfig struct {
 	ListenAddresses []string `toml:"listen_addresses"`
+	Path            string   `toml:"path"`
 	CertFile        string   `toml:"cert_file"`
 	CertKeyFile     string   `toml:"cert_key_file"`
 }
@@ -357,6 +358,7 @@ func ConfigLoad(proxy *Proxy, flags *ConfigFlags) error {
 
 	proxy.listenAddresses = config.ListenAddresses
 	proxy.localDoHListenAddresses = config.LocalDoH.ListenAddresses
+	proxy.localDoHPath = config.LocalDoH.Path
 	proxy.localDoHCertFile = config.LocalDoH.CertFile
 	proxy.localDoHCertKeyFile = config.LocalDoH.CertKeyFile
 	proxy.daemonize = config.Daemonize

dnscrypt-proxy/example-dnscrypt-proxy.toml

@@ -355,6 +355,11 @@ cache_neg_max_ttl = 600
 # listen_addresses = ['127.0.0.1:3000']
 
 
+## URL path - The standard one is "/dns-query", but anything can be used.
+
+# path = "/dns-query"
+
+
 ## Certificate file and key - Note that the certificate has to be trusted.
 ## See the Wiki for more information.
 

dnscrypt-proxy/local-doh.go

@@ -16,15 +16,19 @@ type localDoHHandler struct {
 }
 
 func (handler localDoHHandler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
+	proxy := handler.proxy
 	dataType := "application/dns-message"
 	writer.Header().Set("Server", "dnscrypt-proxy")
+	if request.URL.Path != proxy.localDoHPath {
+		writer.WriteHeader(404)
+		return
+	}
 	if request.Header.Get("Content-Type") != dataType {
 		writer.Header().Set("Content-Type", "text/plain")
 		writer.WriteHeader(400)
 		writer.Write([]byte("dnscrypt-proxy local DoH server\n"))
 		return
 	}
-	proxy := handler.proxy
 	start := time.Now()
 	clientAddr, err := net.ResolveTCPAddr("tcp", request.RemoteAddr)
 	if err != nil {

dnscrypt-proxy/localhost.pem

@@ -0,0 +1,47 @@
+-----BEGIN PRIVATE KEY-----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+esqkpbHJa+UCgYA7PY0O8POSzcdWkNf6bS5vAqRIdSCpMjGGc4HKRYSuJNnJHVPm
+czNK7Bcm3QPaiexzvI4oYd5G09niVjyUSx3rl7P56Y/MjFVau+d90agjAfyXtyMo
+BVtnAGGnBtUiMvP4GGT06xcZMnnmCqpEbBaZQ/7N8Bdwnxh5sqlMdtX2hwKBgAhL
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+j4edf1AinVCPwRVVu1dtLL5P
+-----END PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
+MIIDAjCCAeoCCQCptj0+TjjIJjANBgkqhkiG9w0BAQsFADBDMREwDwYDVQQKDAhE
+TlNDcnlwdDEaMBgGA1UECwwRTG9jYWwgdGVzdCBzZXJ2ZXIxEjAQBgNVBAMMCWxv
+Y2FsaG9zdDAeFw0xOTExMTgxNDA2MzBaFw0zMzA3MjcxNDA2MzBaMEMxETAPBgNV
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+RdX/YLy1csvjbZoNNuXGWRohXjg0Mjko2tRLmARvxA/gZV5zWycv3BD2BPzyCdS9
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+6mVpsrvrcRLBiHlbi24QBolhFkCSRK8bXes8XDIPuD8iYRwlrVBwOakMFQWMqNfI
+IMOKJomU
+-----END CERTIFICATE-----

dnscrypt-proxy/proxy.go

@@ -32,6 +32,7 @@ type Proxy struct {
 	mainProto                     string
 	listenAddresses               []string
 	localDoHListenAddresses       []string
+	localDoHPath                  string
 	localDoHCertFile              string
 	localDoHCertKeyFile           string
 	daemonize                     bool