1 files changed, 149 insertions, 38 deletions

diff --git a/channels.c b/channels.c
index c293eadf1..f0b8aa7d0 100644
--- a/channels.c
+++ b/channels.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: channels.c,v 1.286 2008/07/16 11:52:19 djm Exp $ */
+/* $OpenBSD: channels.c,v 1.295 2009/02/12 03:00:56 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -296,6 +296,7 @@ channel_new(char *ctype, int type, int rfd, int wfd, int efd,
         buffer_init(&c->input);
         buffer_init(&c->output);
         buffer_init(&c->extended);
+        c->path = NULL;
         c->ostate = CHAN_OUTPUT_OPEN;
         c->istate = CHAN_INPUT_OPEN;
         c->flags = 0;
@@ -402,6 +403,10 @@ channel_free(Channel *c)
                 xfree(c->remote_name);
                 c->remote_name = NULL;
         }
+        if (c->path) {
+                xfree(c->path);
+                c->path = NULL;
+        }
         while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) {
                 if (cc->abandon_cb != NULL)
                         cc->abandon_cb(c, cc->ctx);
@@ -691,7 +696,7 @@ channel_register_open_confirm(int id, channel_callback_fn *fn, void *ctx)
         Channel *c = channel_lookup(id);
 
         if (c == NULL) {
-                logit("channel_register_open_comfirm: %d: bad id", id);
+                logit("channel_register_open_confirm: %d: bad id", id);
                 return;
         }
         c->open_confirm = fn;
@@ -980,7 +985,7 @@ static int
 channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
 {
         char *p, *host;
-        u_int len, have, i, found;
+        u_int len, have, i, found, need;
         char username[256];
         struct {
                 u_int8_t version;
@@ -996,10 +1001,20 @@ channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
         if (have < len)
                 return 0;
         p = buffer_ptr(&c->input);
+
+        need = 1;
+        /* SOCKS4A uses an invalid IP address 0.0.0.x */
+        if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) {
+                debug2("channel %d: socks4a request", c->self);
+                /* ... and needs an extra string (the hostname) */
+                need = 2;
+        }
+        /* Check for terminating NUL on the string(s) */
         for (found = 0, i = len; i < have; i++) {
                 if (p[i] == '\0') {
-                        found = 1;
-                        break;
+                        found++;
+                        if (found == need)
+                                break;
                 }
                 if (i > 1024) {
                         /* the peer is probably sending garbage */
@@ -1008,7 +1023,7 @@ channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
                         return -1;
                 }
         }
-        if (!found)
+        if (found < need)
                 return 0;
         buffer_get(&c->input, (char *)&s4_req.version, 1);
         buffer_get(&c->input, (char *)&s4_req.command, 1);
@@ -1018,23 +1033,46 @@ channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
         p = buffer_ptr(&c->input);
         len = strlen(p);
         debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
+        len++;                                  /* trailing '\0' */
         if (len > have)
                 fatal("channel %d: decode socks4: len %d > have %d",
                     c->self, len, have);
         strlcpy(username, p, sizeof(username));
         buffer_consume(&c->input, len);
-        buffer_consume(&c->input, 1);           /* trailing '\0' */
 
-        host = inet_ntoa(s4_req.dest_addr);
-        strlcpy(c->path, host, sizeof(c->path));
+        if (c->path != NULL) {
+                xfree(c->path);
+                c->path = NULL;
+        }
+        if (need == 1) {                        /* SOCKS4: one string */
+                host = inet_ntoa(s4_req.dest_addr);
+                c->path = xstrdup(host);
+        } else {                                /* SOCKS4A: two strings */
+                have = buffer_len(&c->input);
+                p = buffer_ptr(&c->input);
+                len = strlen(p);
+                debug2("channel %d: decode socks4a: host %s/%d",
+                    c->self, p, len);
+                len++;                          /* trailing '\0' */
+                if (len > have)
+                        fatal("channel %d: decode socks4a: len %d > have %d",
+                            c->self, len, have);
+                if (len > NI_MAXHOST) {
+                        error("channel %d: hostname \"%.100s\" too long",
+                            c->self, p);
+                        return -1;
+                }
+                c->path = xstrdup(p);
+                buffer_consume(&c->input, len);
+        }
         c->host_port = ntohs(s4_req.dest_port);
 
         debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
-            c->self, host, c->host_port, s4_req.command);
+            c->self, c->path, c->host_port, s4_req.command);
 
         if (s4_req.command != 1) {
-                debug("channel %d: cannot handle: socks4 cn %d",
-                    c->self, s4_req.command);
+                debug("channel %d: cannot handle: %s cn %d",
+                    c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command);
                 return -1;
         }
         s4_rsp.version = 0;                     /* vn: 0 for reply */
@@ -1065,7 +1103,7 @@ channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset)
                 u_int8_t atyp;
         } s5_req, s5_rsp;
         u_int16_t dest_port;
-        u_char *p, dest_addr[255+1];
+        u_char *p, dest_addr[255+1], ntop[INET6_ADDRSTRLEN];
         u_int have, need, i, found, nmethods, addrlen, af;
 
         debug2("channel %d: decode socks5", c->self);
@@ -1138,10 +1176,22 @@ channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset)
         buffer_get(&c->input, (char *)&dest_addr, addrlen);
         buffer_get(&c->input, (char *)&dest_port, 2);
         dest_addr[addrlen] = '\0';
-        if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
-                strlcpy(c->path, (char *)dest_addr, sizeof(c->path));
-        else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL)
-                return -1;
+        if (c->path != NULL) {
+                xfree(c->path);
+                c->path = NULL;
+        }
+        if (s5_req.atyp == SSH_SOCKS5_DOMAIN) {
+                if (addrlen >= NI_MAXHOST) {
+                        error("channel %d: dynamic request: socks5 hostname "
+                            "\"%.100s\" too long", c->self, dest_addr);
+                        return -1;
+                }
+                c->path = xstrdup(dest_addr);
+        } else {
+                if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL)
+                        return -1;
+                c->path = xstrdup(ntop);
+        }
         c->host_port = ntohs(dest_port);
 
         debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
@@ -1370,7 +1420,8 @@ channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
                     c->local_window_max, c->local_maxpacket, 0, rtype, 1);
                 nc->listening_port = c->listening_port;
                 nc->host_port = c->host_port;
-                strlcpy(nc->path, c->path, sizeof(nc->path));
+                if (c->path != NULL)
+                        nc->path = xstrdup(c->path);
 
                 if (nextstate == SSH_CHANNEL_DYNAMIC) {
                         /*
@@ -2311,8 +2362,8 @@ channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
                         xfree(lang);
         }
         packet_check_eom();
-        /* Free the channel.  This will also close the socket. */
-        channel_free(c);
+        /* Schedule the channel for cleanup/deletion. */
+        chan_mark_dead(c);
 }
 
 /* ARGSUSED */
@@ -2377,18 +2428,18 @@ channel_input_status_confirm(int type, u_int32_t seq, void *ctxt)
 {
         Channel *c;
         struct channel_confirm *cc;
-        int remote_id;
+        int id;
 
         /* Reset keepalive timeout */
         keep_alive_timeouts = 0;
 
-        remote_id = packet_get_int();
+        id = packet_get_int();
         packet_check_eom();
 
-        debug2("channel_input_confirm: type %d id %d", type, remote_id);
+        debug2("channel_input_status_confirm: type %d id %d", type, id);
 
-        if ((c = channel_lookup(remote_id)) == NULL) {
-                logit("channel_input_success_failure: %d: unknown", remote_id);
+        if ((c = channel_lookup(id)) == NULL) {
+                logit("channel_input_status_confirm: %d: unknown", id);
                 return;
         }       
         ;
@@ -2409,7 +2460,8 @@ channel_set_af(int af)
 }
 
 static int
-channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
+channel_setup_fwd_listener(int type, const char *listen_addr,
+    u_short listen_port, int *allocated_listen_port,
     const char *host_to_connect, u_short port_to_connect, int gateway_ports)
 {
         Channel *c;
@@ -2417,6 +2469,7 @@ channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_por
         struct addrinfo hints, *ai, *aitop;
         const char *host, *addr;
         char ntop[NI_MAXHOST], strport[NI_MAXSERV];
+        in_port_t *lport_p;
 
         host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
             listen_addr : host_to_connect;
@@ -2426,7 +2479,7 @@ channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_por
                 error("No forward host name.");
                 return 0;
         }
-        if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
+        if (strlen(host) >= NI_MAXHOST) {
                 error("Forward host name too long.");
                 return 0;
         }
@@ -2485,10 +2538,29 @@ channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_por
                 }
                 return 0;
         }
-
+        if (allocated_listen_port != NULL)
+                *allocated_listen_port = 0;
         for (ai = aitop; ai; ai = ai->ai_next) {
-                if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
+                switch (ai->ai_family) {
+                case AF_INET:
+                        lport_p = &((struct sockaddr_in *)ai->ai_addr)->
+                            sin_port;
+                        break;
+                case AF_INET6:
+                        lport_p = &((struct sockaddr_in6 *)ai->ai_addr)->
+                            sin6_port;
+                        break;
+                default:
                         continue;
+                }
+                /*
+                 * If allocating a port for -R forwards, then use the
+                 * same port for all address families.
+                 */
+                if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 &&
+                    allocated_listen_port != NULL && *allocated_listen_port > 0)
+                        *lport_p = htons(*allocated_listen_port);
+
                 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
                     strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
                         error("channel_setup_fwd_listener: getnameinfo failed");
@@ -2504,7 +2576,8 @@ channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_por
 
                 channel_set_reuseaddr(sock);
 
-                debug("Local forwarding listening on %s port %s.", ntop, strport);
+                debug("Local forwarding listening on %s port %s.",
+                    ntop, strport);
 
                 /* Bind the socket to the address. */
                 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
@@ -2523,11 +2596,24 @@ channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_por
                         close(sock);
                         continue;
                 }
+
+                /*
+                 * listen_port == 0 requests a dynamically allocated port -
+                 * record what we got.
+                 */
+                if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 &&
+                    allocated_listen_port != NULL &&
+                    *allocated_listen_port == 0) {
+                        *allocated_listen_port = get_sock_port(sock, 1);
+                        debug("Allocated listen port %d",
+                            *allocated_listen_port);
+                }
+
                 /* Allocate a channel number for the socket. */
                 c = channel_new("port listener", type, sock, sock, -1,
                     CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
                     0, "port listener", 1);
-                strlcpy(c->path, host, sizeof(c->path));
+                c->path = xstrdup(host);
                 c->host_port = port_to_connect;
                 c->listening_port = listen_port;
                 success = 1;
@@ -2549,8 +2635,7 @@ channel_cancel_rport_listener(const char *host, u_short port)
                 Channel *c = channels[i];
 
                 if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER &&
-                    strncmp(c->path, host, sizeof(c->path)) == 0 &&
-                    c->listening_port == port) {
+                    strcmp(c->path, host) == 0 && c->listening_port == port) {
                         debug2("%s: close channel %d", __func__, i);
                         channel_free(c);
                         found = 1;
@@ -2566,17 +2651,18 @@ channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port,
     const char *host_to_connect, u_short port_to_connect, int gateway_ports)
 {
         return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
-            listen_host, listen_port, host_to_connect, port_to_connect,
+            listen_host, listen_port, NULL, host_to_connect, port_to_connect,
             gateway_ports);
 }
 
 /* protocol v2 remote port fwd, used by sshd */
 int
 channel_setup_remote_fwd_listener(const char *listen_address,
-    u_short listen_port, int gateway_ports)
+    u_short listen_port, int *allocated_listen_port, int gateway_ports)
 {
         return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
-            listen_address, listen_port, NULL, 0, gateway_ports);
+            listen_address, listen_port, allocated_listen_port,
+            NULL, 0, gateway_ports);
 }
 
 /*
@@ -2791,10 +2877,16 @@ channel_print_adm_permitted_opens(void)
 {
         int i;
 
+        printf("permitopen");
+        if (num_adm_permitted_opens == 0) {
+                printf(" any\n");
+                return;
+        }
         for (i = 0; i < num_adm_permitted_opens; i++)
                 if (permitted_adm_opens[i].host_to_connect != NULL)
                         printf(" %s:%d", permitted_adm_opens[i].host_to_connect,
                             permitted_adm_opens[i].port_to_connect);
+        printf("\n");
 }
 
 /* Try to start non-blocking connect to next host in cctx list */
@@ -3078,7 +3170,7 @@ x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
 }
 
 static int
-connect_local_xsocket(u_int dnr)
+connect_local_xsocket_path(const char *pathname)
 {
         int sock;
         struct sockaddr_un addr;
@@ -3088,7 +3180,7 @@ connect_local_xsocket(u_int dnr)
                 error("socket: %.100s", strerror(errno));
         memset(&addr, 0, sizeof(addr));
         addr.sun_family = AF_UNIX;
-        snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
+        strlcpy(addr.sun_path, pathname, sizeof addr.sun_path);
         if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
                 return sock;
         close(sock);
@@ -3096,6 +3188,14 @@ connect_local_xsocket(u_int dnr)
         return -1;
 }
 
+static int
+connect_local_xsocket(u_int dnr)
+{
+        char buf[1024];
+        snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr);
+        return connect_local_xsocket_path(buf);
+}
+
 int
 x11_connect_display(void)
 {
@@ -3117,6 +3217,17 @@ x11_connect_display(void)
          * connection to the real X server.
          */
 
+        /* Check if the display is from launchd. */
+#ifdef __APPLE__
+        if (strncmp(display, "/tmp/launch", 11) == 0) {
+                sock = connect_local_xsocket_path(display);
+                if (sock < 0)
+                        return -1;
+
+                /* OK, we now have a connection to the display. */
+                return sock;
+        }
+#endif
         /*
          * Check if it is a unix domain socket.  Unix domain displays are in
          * one of the following formats: unix:d[.s], :d[.s], ::d[.s]