upstream commit

unbreak Unix domain socket forwarding for root; ok
markus@

Upstream-ID: 6649c76eb7a3fa15409373295ca71badf56920a2

Origin: https://anongit.mindrot.org/openssh.git/commit/?id=51045869fa084cdd016fdd721ea760417c0a3bf3
Bug-Debian: https://bugs.debian.org/858252
Last-Update: 2017-03-30

Patch-Name: unbreak-unix-forwarding-for-root.patch

1 files changed, 12 insertions, 7 deletions

diff --git a/serverloop.c b/serverloop.c
index c4e4699da..c55d203bc 100644
--- a/serverloop.c
+++ b/serverloop.c
@@ -468,6 +468,10 @@ server_request_direct_streamlocal(void)
         Channel *c = NULL;
         char *target, *originator;
         u_short originator_port;
+        struct passwd *pw = the_authctxt->pw;
+
+        if (pw == NULL || !the_authctxt->valid)
+                fatal("server_input_global_request: no/invalid user");
 
         target = packet_get_string(NULL);
         originator = packet_get_string(NULL);
@@ -480,7 +484,7 @@ server_request_direct_streamlocal(void)
         /* XXX fine grained permissions */
         if ((options.allow_streamlocal_forwarding & FORWARD_LOCAL) != 0 &&
             !no_port_forwarding_flag && !options.disable_forwarding &&
-            use_privsep) {
+            (pw->pw_uid == 0 || use_privsep)) {
                 c = channel_connect_to_path(target,
                     "direct-streamlocal@openssh.com", "direct-streamlocal");
         } else {
@@ -702,6 +706,10 @@ server_input_global_request(int type, u_int32_t seq, void *ctxt)
         int want_reply;
         int r, success = 0, allocated_listen_port = 0;
         struct sshbuf *resp = NULL;
+        struct passwd *pw = the_authctxt->pw;
+
+        if (pw == NULL || !the_authctxt->valid)
+                fatal("server_input_global_request: no/invalid user");
 
         rtype = packet_get_string(NULL);
         want_reply = packet_get_char();
@@ -709,12 +717,8 @@ server_input_global_request(int type, u_int32_t seq, void *ctxt)
 
         /* -R style forwarding */
         if (strcmp(rtype, "tcpip-forward") == 0) {
-                struct passwd *pw;
                 struct Forward fwd;
 
-                pw = the_authctxt->pw;
-                if (pw == NULL || !the_authctxt->valid)
-                        fatal("server_input_global_request: no/invalid user");
                 memset(&fwd, 0, sizeof(fwd));
                 fwd.listen_host = packet_get_string(NULL);
                 fwd.listen_port = (u_short)packet_get_int();
@@ -762,9 +766,10 @@ server_input_global_request(int type, u_int32_t seq, void *ctxt)
                 /* check permissions */
                 if ((options.allow_streamlocal_forwarding & FORWARD_REMOTE) == 0
                     || no_port_forwarding_flag || options.disable_forwarding ||
-                    !use_privsep) {
+                    (pw->pw_uid != 0 && !use_privsep)) {
                         success = 0;
-                        packet_send_debug("Server has disabled port forwarding.");
+                        packet_send_debug("Server has disabled "
+                            "streamlocal forwarding.");
                 } else {
                         /* Start listening on the socket */
                         success = channel_setup_remote_fwd_listener(