Merge remote-tracking branch 'tor-github/pr/1382'

changes/bug28966

@@ -0,0 +1,4 @@
+  o Minor features (onion services v3):
+    - Assist users who try to setup v2 client authorization in v3 onion
+      services by pointing them to the right documentation. Closes ticket
+      28966.

doc/tor.1.txt

@@ -1142,7 +1142,7 @@ The following options are useful only for clients (that is, if
     information) to port 80.
 
 [[HidServAuth]] **HidServAuth** __onion-address__ __auth-cookie__ [__service-name__]::
-    Client authorization for a hidden service. Valid onion addresses contain 16
+    Client authorization for a v2 hidden service. Valid onion addresses contain 16
     characters in a-z2-7 plus ".onion", and valid auth cookies contain 22
     characters in A-Za-z0-9+/. The service name is only used for internal
     purposes, e.g., for Tor controllers. This option may be used multiple times
@@ -2961,7 +2961,7 @@ The next section describes the per service options that can only be set
     service. Currently, versions 2 and 3 are supported. (Default: 3)
 
 [[HiddenServiceAuthorizeClient]] **HiddenServiceAuthorizeClient** __auth-type__ __client-name__,__client-name__,__...__::
-    If configured, the hidden service is accessible for authorized clients
+    If configured, the v2 hidden service is accessible for authorized clients
     only. The auth-type can either be \'basic' for a general-purpose
     authorization protocol or \'stealth' for a less scalable protocol that also
     hides service activity from unauthorized clients. Only clients that are
@@ -3105,6 +3105,8 @@ Client Authorization
 
 (Version 3 only)
 
+Service side:
+
   To configure client authorization on the service side, the
   "<HiddenServiceDir>/authorized_clients/" directory needs to exist. Each file
   in that directory should be suffixed with ".auth" (i.e. "alice.auth"; the
@@ -3128,8 +3130,17 @@ Revoking a client can be done by removing their ".auth" file, however the
   revocation will be in effect only after the tor process gets restarted even if
   a SIGHUP takes place.
 
-See the Appendix G in the rend-spec-v3.txt file of
-https://spec.torproject.org/[torspec] for more information.
+Client side:
+
+  To access a v3 onion service with client authorization as a client, make sure
+  you have ClientOnionAuthDir set in your torrc. Then, in the
+  <ClientOnionAuthDir> directory, create an .auth_private file for the onion
+  service corresponding to this key (i.e. 'bob_onion.auth_private').  The
+  contents of the <ClientOnionAuthDir>/<user>.auth_private file should look like:
+
+      <56-char-onion-addr-without-.onion-part>:descriptor:x25519:<x25519 private key in base32>
+
+For more information, please see https://2019.www.torproject.org/docs/tor-onion-service.html.en#ClientAuthorization .
 
 TESTING NETWORK OPTIONS
 -----------------------

src/feature/hs/hs_config.c

@@ -253,6 +253,16 @@ config_has_invalid_options(const config_line_t *line_,
                             "version %" PRIu32 " of service in %s",
                  opt, service->config.version,
                  service->config.directory_path);
+
+        if (!strcasecmp(line->key, "HiddenServiceAuthorizeClient")) {
+          /* Special case this v2 option so that we can offer alternatives.
+           * If more such special cases appear, it would be good to
+           * generalize the exception mechanism here. */
+          log_warn(LD_CONFIG, "For v3 onion service client authorization, "
+                   "please read the 'CLIENT AUTHORIZATION' section in the "
+                   "manual.");
+        }
+
         ret = 1;
         /* Continue the loop so we can find all possible options. */
         continue;