- millert@cvs.openbsd.org 2014/07/15 15:54:14

     [PROTOCOL auth-options.c auth-passwd.c auth-rh-rsa.c auth-rhosts.c]
     [auth-rsa.c auth.c auth1.c auth2-hostbased.c auth2-kbdint.c auth2-none.c]
     [auth2-passwd.c auth2-pubkey.c auth2.c canohost.c channels.c channels.h]
     [clientloop.c misc.c misc.h monitor.c mux.c packet.c readconf.c]
     [readconf.h servconf.c servconf.h serverloop.c session.c ssh-agent.c]
     [ssh.c ssh_config.5 sshconnect.c sshconnect1.c sshconnect2.c sshd.c]
     [sshd_config.5 sshlogin.c]
     Add support for Unix domain socket forwarding.  A remote TCP port
     may be forwarded to a local Unix domain socket and vice versa or
     both ends may be a Unix domain socket.  This is a reimplementation
     of the streamlocal patches by William Ahern from:
         http://www.25thandclement.com/~william/projects/streamlocal.html
     OK djm@ markus@

1 files changed, 483 insertions, 117 deletions

diff --git a/channels.c b/channels.c
index dcd75346b..d67fdf48b 100644
--- a/channels.c
+++ b/channels.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: channels.c,v 1.335 2014/07/05 23:11:48 djm Exp $ */
+/* $OpenBSD: channels.c,v 1.336 2014/07/15 15:54:14 millert Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -42,6 +42,7 @@
 #include "includes.h"
 
 #include <sys/types.h>
+#include <sys/stat.h>
 #include <sys/ioctl.h>
 #include <sys/un.h>
 #include <sys/socket.h>
@@ -107,11 +108,15 @@ static int channel_max_fd = 0;
  * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
  * network (which might be behind a firewall).
  */
+/* XXX: streamlocal wants a path instead of host:port */
+/*      Overload host_to_connect; we could just make this match Forward */
+/*      XXX - can we use listen_host instead of listen_path? */
 typedef struct {
         char *host_to_connect;          /* Connect to 'host'. */
-        u_short port_to_connect;        /* Connect to 'port'. */
+        int port_to_connect;            /* Connect to 'port'. */
         char *listen_host;              /* Remote side should listen address. */
-        u_short listen_port;            /* Remote side should listen port. */
+        char *listen_path;              /* Remote side should listen path. */
+        int listen_port;                /* Remote side should listen port. */
 } ForwardPermission;
 
 /* List of all permitted host/port pairs to connect by the user. */
@@ -474,6 +479,8 @@ channel_stop_listening(void)
                         case SSH_CHANNEL_PORT_LISTENER:
                         case SSH_CHANNEL_RPORT_LISTENER:
                         case SSH_CHANNEL_X11_LISTENER:
+                        case SSH_CHANNEL_UNIX_LISTENER:
+                        case SSH_CHANNEL_RUNIX_LISTENER:
                                 channel_close_fd(&c->sock);
                                 channel_free(c);
                                 break;
@@ -536,6 +543,8 @@ channel_still_open(void)
                 case SSH_CHANNEL_CONNECTING:
                 case SSH_CHANNEL_ZOMBIE:
                 case SSH_CHANNEL_ABANDONED:
+                case SSH_CHANNEL_UNIX_LISTENER:
+                case SSH_CHANNEL_RUNIX_LISTENER:
                         continue;
                 case SSH_CHANNEL_LARVAL:
                         if (!compat20)
@@ -582,6 +591,8 @@ channel_find_open(void)
                 case SSH_CHANNEL_CONNECTING:
                 case SSH_CHANNEL_ZOMBIE:
                 case SSH_CHANNEL_ABANDONED:
+                case SSH_CHANNEL_UNIX_LISTENER:
+                case SSH_CHANNEL_RUNIX_LISTENER:
                         continue;
                 case SSH_CHANNEL_LARVAL:
                 case SSH_CHANNEL_AUTH_SOCKET:
@@ -632,6 +643,8 @@ channel_open_message(void)
                 case SSH_CHANNEL_ABANDONED:
                 case SSH_CHANNEL_MUX_CLIENT:
                 case SSH_CHANNEL_MUX_LISTENER:
+                case SSH_CHANNEL_UNIX_LISTENER:
+                case SSH_CHANNEL_RUNIX_LISTENER:
                         continue;
                 case SSH_CHANNEL_LARVAL:
                 case SSH_CHANNEL_OPENING:
@@ -1387,7 +1400,6 @@ channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset)
 static void
 port_open_helper(Channel *c, char *rtype)
 {
-        int direct;
         char buf[1024];
         char *local_ipaddr = get_local_ipaddr(c->sock);
         int local_port = c->sock == -1 ? 65536 : get_sock_port(c->sock, 1);
@@ -1401,8 +1413,6 @@ port_open_helper(Channel *c, char *rtype)
                 remote_port = 65535;
         }
 
-        direct = (strcmp(rtype, "direct-tcpip") == 0);
-
         snprintf(buf, sizeof buf,
             "%s: listening port %d for %.100s port %d, "
             "connect from %.200s port %d to %.100s port %d",
@@ -1418,18 +1428,29 @@ port_open_helper(Channel *c, char *rtype)
                 packet_put_int(c->self);
                 packet_put_int(c->local_window_max);
                 packet_put_int(c->local_maxpacket);
-                if (direct) {
+                if (strcmp(rtype, "direct-tcpip") == 0) {
                         /* target host, port */
                         packet_put_cstring(c->path);
                         packet_put_int(c->host_port);
+                } else if (strcmp(rtype, "direct-streamlocal@openssh.com") == 0) {
+                        /* target path */
+                        packet_put_cstring(c->path);
+                } else if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) {
+                        /* listen path */
+                        packet_put_cstring(c->path);
                 } else {
                         /* listen address, port */
                         packet_put_cstring(c->path);
                         packet_put_int(local_port);
                 }
-                /* originator host and port */
-                packet_put_cstring(remote_ipaddr);
-                packet_put_int((u_int)remote_port);
+                if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) {
+                        /* reserved for future owner/mode info */
+                        packet_put_cstring("");
+                } else {
+                        /* originator host and port */
+                        packet_put_cstring(remote_ipaddr);
+                        packet_put_int((u_int)remote_port);
+                }
                 packet_send();
         } else {
                 packet_start(SSH_MSG_PORT_OPEN);
@@ -1479,14 +1500,18 @@ channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
                 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
                         nextstate = SSH_CHANNEL_OPENING;
                         rtype = "forwarded-tcpip";
+                } else if (c->type == SSH_CHANNEL_RUNIX_LISTENER) {
+                        nextstate = SSH_CHANNEL_OPENING;
+                        rtype = "forwarded-streamlocal@openssh.com";
+                } else if (c->host_port == PORT_STREAMLOCAL) {
+                        nextstate = SSH_CHANNEL_OPENING;
+                        rtype = "direct-streamlocal@openssh.com";
+                } else if (c->host_port == 0) {
+                        nextstate = SSH_CHANNEL_DYNAMIC;
+                        rtype = "dynamic-tcpip";
                 } else {
-                        if (c->host_port == 0) {
-                                nextstate = SSH_CHANNEL_DYNAMIC;
-                                rtype = "dynamic-tcpip";
-                        } else {
-                                nextstate = SSH_CHANNEL_OPENING;
-                                rtype = "direct-tcpip";
-                        }
+                        nextstate = SSH_CHANNEL_OPENING;
+                        rtype = "direct-tcpip";
                 }
 
                 addrlen = sizeof(addr);
@@ -1499,7 +1524,8 @@ channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
                                 c->notbefore = monotime() + 1;
                         return;
                 }
-                set_nodelay(newsock);
+                if (c->host_port != PORT_STREAMLOCAL)
+                        set_nodelay(newsock);
                 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
                     c->local_window_max, c->local_maxpacket, 0, rtype, 1);
                 nc->listening_port = c->listening_port;
@@ -1988,6 +2014,8 @@ channel_handler_init_20(void)
         channel_pre[SSH_CHANNEL_X11_OPEN] =             &channel_pre_x11_open;
         channel_pre[SSH_CHANNEL_PORT_LISTENER] =        &channel_pre_listener;
         channel_pre[SSH_CHANNEL_RPORT_LISTENER] =       &channel_pre_listener;
+        channel_pre[SSH_CHANNEL_UNIX_LISTENER] =        &channel_pre_listener;
+        channel_pre[SSH_CHANNEL_RUNIX_LISTENER] =       &channel_pre_listener;
         channel_pre[SSH_CHANNEL_X11_LISTENER] =         &channel_pre_listener;
         channel_pre[SSH_CHANNEL_AUTH_SOCKET] =          &channel_pre_listener;
         channel_pre[SSH_CHANNEL_CONNECTING] =           &channel_pre_connecting;
@@ -1998,6 +2026,8 @@ channel_handler_init_20(void)
         channel_post[SSH_CHANNEL_OPEN] =                &channel_post_open;
         channel_post[SSH_CHANNEL_PORT_LISTENER] =       &channel_post_port_listener;
         channel_post[SSH_CHANNEL_RPORT_LISTENER] =      &channel_post_port_listener;
+        channel_post[SSH_CHANNEL_UNIX_LISTENER] =       &channel_post_port_listener;
+        channel_post[SSH_CHANNEL_RUNIX_LISTENER] =      &channel_post_port_listener;
         channel_post[SSH_CHANNEL_X11_LISTENER] =        &channel_post_x11_listener;
         channel_post[SSH_CHANNEL_AUTH_SOCKET] =         &channel_post_auth_listener;
         channel_post[SSH_CHANNEL_CONNECTING] =          &channel_post_connecting;
@@ -2638,7 +2668,7 @@ channel_input_port_open(int type, u_int32_t seq, void *ctxt)
                 originator_string = xstrdup("unknown (remote did not supply name)");
         }
         packet_check_eom();
-        c = channel_connect_to(host, host_port,
+        c = channel_connect_to_port(host, host_port,
             "connected socket", originator_string);
         free(originator_string);
         free(host);
@@ -2705,20 +2735,20 @@ channel_set_af(int af)
  */
 static const char *
 channel_fwd_bind_addr(const char *listen_addr, int *wildcardp,
-    int is_client, int gateway_ports)
+    int is_client, struct ForwardOptions *fwd_opts)
 {
         const char *addr = NULL;
         int wildcard = 0;
 
         if (listen_addr == NULL) {
                 /* No address specified: default to gateway_ports setting */
-                if (gateway_ports)
+                if (fwd_opts->gateway_ports)
                         wildcard = 1;
-        } else if (gateway_ports || is_client) {
+        } else if (fwd_opts->gateway_ports || is_client) {
                 if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
                     strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) ||
                     *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
-                    (!is_client && gateway_ports == 1)) {
+                    (!is_client && fwd_opts->gateway_ports == 1)) {
                         wildcard = 1;
                         /*
                          * Notify client if they requested a specific listen
@@ -2752,9 +2782,8 @@ channel_fwd_bind_addr(const char *listen_addr, int *wildcardp,
 }
 
 static int
-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_setup_fwd_listener_tcpip(int type, struct Forward *fwd,
+    int *allocated_listen_port, struct ForwardOptions *fwd_opts)
 {
         Channel *c;
         int sock, r, success = 0, wildcard = 0, is_client;
@@ -2764,7 +2793,7 @@ channel_setup_fwd_listener(int type, const char *listen_addr,
         in_port_t *lport_p;
 
         host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
-            listen_addr : host_to_connect;
+            fwd->listen_host : fwd->connect_host;
         is_client = (type == SSH_CHANNEL_PORT_LISTENER);
 
         if (host == NULL) {
@@ -2777,9 +2806,9 @@ channel_setup_fwd_listener(int type, const char *listen_addr,
         }
 
         /* Determine the bind address, cf. channel_fwd_bind_addr() comment */
-        addr = channel_fwd_bind_addr(listen_addr, &wildcard,
-            is_client, gateway_ports);
-        debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s",
+        addr = channel_fwd_bind_addr(fwd->listen_host, &wildcard,
+            is_client, fwd_opts);
+        debug3("%s: type %d wildcard %d addr %s", __func__,
             type, wildcard, (addr == NULL) ? "NULL" : addr);
 
         /*
@@ -2790,15 +2819,14 @@ channel_setup_fwd_listener(int type, const char *listen_addr,
         hints.ai_family = IPv4or6;
         hints.ai_flags = wildcard ? AI_PASSIVE : 0;
         hints.ai_socktype = SOCK_STREAM;
-        snprintf(strport, sizeof strport, "%d", listen_port);
+        snprintf(strport, sizeof strport, "%d", fwd->listen_port);
         if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
                 if (addr == NULL) {
                         /* This really shouldn't happen */
                         packet_disconnect("getaddrinfo: fatal error: %s",
                             ssh_gai_strerror(r));
                 } else {
-                        error("channel_setup_fwd_listener: "
-                            "getaddrinfo(%.64s): %s", addr,
+                        error("%s: getaddrinfo(%.64s): %s", __func__, addr,
                             ssh_gai_strerror(r));
                 }
                 return 0;
@@ -2822,13 +2850,13 @@ channel_setup_fwd_listener(int type, const char *listen_addr,
                  * 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 &&
+                if (type == SSH_CHANNEL_RPORT_LISTENER && fwd->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");
+                        error("%s: getnameinfo failed", __func__);
                         continue;
                 }
                 /* Create a port to listen for the host. */
@@ -2865,10 +2893,10 @@ channel_setup_fwd_listener(int type, const char *listen_addr,
                 }
 
                 /*
-                 * listen_port == 0 requests a dynamically allocated port -
+                 * fwd->listen_port == 0 requests a dynamically allocated port -
                  * record what we got.
                  */
-                if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 &&
+                if (type == SSH_CHANNEL_RPORT_LISTENER && fwd->listen_port == 0 &&
                     allocated_listen_port != NULL &&
                     *allocated_listen_port == 0) {
                         *allocated_listen_port = get_sock_port(sock, 1);
@@ -2881,24 +2909,98 @@ channel_setup_fwd_listener(int type, const char *listen_addr,
                     CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
                     0, "port listener", 1);
                 c->path = xstrdup(host);
-                c->host_port = port_to_connect;
+                c->host_port = fwd->connect_port;
                 c->listening_addr = addr == NULL ? NULL : xstrdup(addr);
-                if (listen_port == 0 && allocated_listen_port != NULL &&
+                if (fwd->listen_port == 0 && allocated_listen_port != NULL &&
                     !(datafellows & SSH_BUG_DYNAMIC_RPORT))
                         c->listening_port = *allocated_listen_port;
                 else
-                        c->listening_port = listen_port;
+                        c->listening_port = fwd->listen_port;
                 success = 1;
         }
         if (success == 0)
-                error("channel_setup_fwd_listener: cannot listen to port: %d",
-                    listen_port);
+                error("%s: cannot listen to port: %d", __func__,
+                    fwd->listen_port);
         freeaddrinfo(aitop);
         return success;
 }
 
-int
-channel_cancel_rport_listener(const char *host, u_short port)
+static int
+channel_setup_fwd_listener_streamlocal(int type, struct Forward *fwd,
+    struct ForwardOptions *fwd_opts)
+{
+        struct sockaddr_un sunaddr;
+        const char *path;
+        Channel *c;
+        int port, sock;
+        mode_t omask;
+
+        switch (type) {
+        case SSH_CHANNEL_UNIX_LISTENER:
+                if (fwd->connect_path != NULL) {
+                        if (strlen(fwd->connect_path) > sizeof(sunaddr.sun_path)) {
+                                error("Local connecting path too long: %s",
+                                    fwd->connect_path);
+                                return 0;
+                        }
+                        path = fwd->connect_path;
+                        port = PORT_STREAMLOCAL;
+                } else {
+                        if (fwd->connect_host == NULL) {
+                                error("No forward host name.");
+                                return 0;
+                        }
+                        if (strlen(fwd->connect_host) >= NI_MAXHOST) {
+                                error("Forward host name too long.");
+                                return 0;
+                        }
+                        path = fwd->connect_host;
+                        port = fwd->connect_port;
+                }
+                break;
+        case SSH_CHANNEL_RUNIX_LISTENER:
+                path = fwd->listen_path;
+                port = PORT_STREAMLOCAL;
+                break;
+        default:
+                error("%s: unexpected channel type %d", __func__, type);
+                return 0;
+        }
+
+        if (fwd->listen_path == NULL) {
+                error("No forward path name.");
+                return 0;
+        }
+        if (strlen(fwd->listen_path) > sizeof(sunaddr.sun_path)) {
+                error("Local listening path too long: %s", fwd->listen_path);
+                return 0;
+        }
+
+        debug3("%s: type %d path %s", __func__, type, fwd->listen_path);
+
+        /* Start a Unix domain listener. */
+        omask = umask(fwd_opts->streamlocal_bind_mask);
+        sock = unix_listener(fwd->listen_path, SSH_LISTEN_BACKLOG,
+            fwd_opts->streamlocal_bind_unlink);
+        umask(omask);
+        if (sock < 0)
+                return 0;
+
+        debug("Local forwarding listening on path %s.", fwd->listen_path);
+
+        /* Allocate a channel number for the socket. */
+        c = channel_new("unix listener", type, sock, sock, -1,
+            CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
+            0, "unix listener", 1);
+        c->path = xstrdup(path);
+        c->host_port = port;
+        c->listening_port = PORT_STREAMLOCAL;
+        c->listening_addr = xstrdup(fwd->listen_path);
+        return 1;
+}
+
+static int
+channel_cancel_rport_listener_tcpip(const char *host, u_short port)
 {
         u_int i;
         int found = 0;
@@ -2917,13 +3019,44 @@ channel_cancel_rport_listener(const char *host, u_short port)
         return (found);
 }
 
+static int
+channel_cancel_rport_listener_streamlocal(const char *path)
+{
+        u_int i;
+        int found = 0;
+
+        for (i = 0; i < channels_alloc; i++) {
+                Channel *c = channels[i];
+                if (c == NULL || c->type != SSH_CHANNEL_RUNIX_LISTENER)
+                        continue;
+                if (c->path == NULL)
+                        continue;
+                if (strcmp(c->path, path) == 0) {
+                        debug2("%s: close channel %d", __func__, i);
+                        channel_free(c);
+                        found = 1;
+                }
+        }
+
+        return (found);
+}
+
 int
-channel_cancel_lport_listener(const char *lhost, u_short lport,
-    int cport, int gateway_ports)
+channel_cancel_rport_listener(struct Forward *fwd)
+{
+        if (fwd->listen_path != NULL)
+                return channel_cancel_rport_listener_streamlocal(fwd->listen_path);
+        else
+                return channel_cancel_rport_listener_tcpip(fwd->listen_host, fwd->listen_port);
+}
+
+static int
+channel_cancel_lport_listener_tcpip(const char *lhost, u_short lport,
+    int cport, struct ForwardOptions *fwd_opts)
 {
         u_int i;
         int found = 0;
-        const char *addr = channel_fwd_bind_addr(lhost, NULL, 1, gateway_ports);
+        const char *addr = channel_fwd_bind_addr(lhost, NULL, 1, fwd_opts);
 
         for (i = 0; i < channels_alloc; i++) {
                 Channel *c = channels[i];
@@ -2952,24 +3085,68 @@ channel_cancel_lport_listener(const char *lhost, u_short lport,
         return (found);
 }
 
+static int
+channel_cancel_lport_listener_streamlocal(const char *path)
+{
+        u_int i;
+        int found = 0;
+
+        if (path == NULL) {
+                error("%s: no path specified.", __func__);
+                return 0;
+        }
+
+        for (i = 0; i < channels_alloc; i++) {
+                Channel *c = channels[i];
+                if (c == NULL || c->type != SSH_CHANNEL_UNIX_LISTENER)
+                        continue;
+                if (c->listening_addr == NULL)
+                        continue;
+                if (strcmp(c->listening_addr, path) == 0) {
+                        debug2("%s: close channel %d", __func__, i);
+                        channel_free(c);
+                        found = 1;
+                }
+        }
+
+        return (found);
+}
+
+int
+channel_cancel_lport_listener(struct Forward *fwd, int cport, struct ForwardOptions *fwd_opts)
+{
+        if (fwd->listen_path != NULL)
+                return channel_cancel_lport_listener_streamlocal(fwd->listen_path);
+        else
+                return channel_cancel_lport_listener_tcpip(fwd->listen_host, fwd->listen_port, cport, fwd_opts);
+}
+
 /* protocol local port fwd, used by ssh (and sshd in v1) */
 int
-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)
+channel_setup_local_fwd_listener(struct Forward *fwd, struct ForwardOptions *fwd_opts)
 {
-        return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
-            listen_host, listen_port, NULL, host_to_connect, port_to_connect,
-            gateway_ports);
+        if (fwd->listen_path != NULL) {
+                return channel_setup_fwd_listener_streamlocal(
+                    SSH_CHANNEL_UNIX_LISTENER, fwd, fwd_opts);
+        } else {
+                return channel_setup_fwd_listener_tcpip(SSH_CHANNEL_PORT_LISTENER,
+                    fwd, NULL, fwd_opts);
+        }
 }
 
 /* protocol v2 remote port fwd, used by sshd */
 int
-channel_setup_remote_fwd_listener(const char *listen_address,
-    u_short listen_port, int *allocated_listen_port, int gateway_ports)
+channel_setup_remote_fwd_listener(struct Forward *fwd,
+    int *allocated_listen_port, struct ForwardOptions *fwd_opts)
 {
-        return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
-            listen_address, listen_port, allocated_listen_port,
-            NULL, 0, gateway_ports);
+        if (fwd->listen_path != NULL) {
+                return channel_setup_fwd_listener_streamlocal(
+                    SSH_CHANNEL_RUNIX_LISTENER, fwd, fwd_opts);
+        } else {
+                return channel_setup_fwd_listener_tcpip(
+                    SSH_CHANNEL_RPORT_LISTENER, fwd, allocated_listen_port,
+                    fwd_opts);
+        }
 }
 
 /*
@@ -3000,27 +3177,32 @@ channel_rfwd_bind_host(const char *listen_host)
  * channel_update_permitted_opens().
  */
 int
-channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
-    const char *host_to_connect, u_short port_to_connect)
+channel_request_remote_forwarding(struct Forward *fwd)
 {
         int type, success = 0, idx = -1;
 
         /* Send the forward request to the remote side. */
         if (compat20) {
                 packet_start(SSH2_MSG_GLOBAL_REQUEST);
-                packet_put_cstring("tcpip-forward");
-                packet_put_char(1);             /* boolean: want reply */
-                packet_put_cstring(channel_rfwd_bind_host(listen_host));
-                packet_put_int(listen_port);
+                if (fwd->listen_path != NULL) {
+                    packet_put_cstring("streamlocal-forward@openssh.com");
+                    packet_put_char(1);         /* boolean: want reply */
+                    packet_put_cstring(fwd->listen_path);
+                } else {
+                    packet_put_cstring("tcpip-forward");
+                    packet_put_char(1);         /* boolean: want reply */
+                    packet_put_cstring(channel_rfwd_bind_host(fwd->listen_host));
+                    packet_put_int(fwd->listen_port);
+                }
                 packet_send();
                 packet_write_wait();
                 /* Assume that server accepts the request */
                 success = 1;
-        } else {
+        } else if (fwd->listen_path == NULL) {
                 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
-                packet_put_int(listen_port);
-                packet_put_cstring(host_to_connect);
-                packet_put_int(port_to_connect);
+                packet_put_int(fwd->listen_port);
+                packet_put_cstring(fwd->connect_host);
+                packet_put_int(fwd->connect_port);
                 packet_send();
                 packet_write_wait();
 
@@ -3037,24 +3219,43 @@ channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
                         packet_disconnect("Protocol error for port forward request:"
                             "received packet type %d.", type);
                 }
+        } else {
+                logit("Warning: Server does not support remote stream local forwarding.");
         }
         if (success) {
                 /* Record that connection to this host/port is permitted. */
                 permitted_opens = xrealloc(permitted_opens,
                     num_permitted_opens + 1, sizeof(*permitted_opens));
                 idx = num_permitted_opens++;
-                permitted_opens[idx].host_to_connect = xstrdup(host_to_connect);
-                permitted_opens[idx].port_to_connect = port_to_connect;
-                permitted_opens[idx].listen_host = listen_host ?
-                    xstrdup(listen_host) : NULL;
-                permitted_opens[idx].listen_port = listen_port;
+                if (fwd->connect_path != NULL) {
+                        permitted_opens[idx].host_to_connect =
+                            xstrdup(fwd->connect_path);
+                        permitted_opens[idx].port_to_connect =
+                            PORT_STREAMLOCAL;
+                } else {
+                        permitted_opens[idx].host_to_connect =
+                            xstrdup(fwd->connect_host);
+                        permitted_opens[idx].port_to_connect =
+                            fwd->connect_port;
+                }
+                if (fwd->listen_path != NULL) {
+                        permitted_opens[idx].listen_host = NULL;
+                        permitted_opens[idx].listen_path =
+                            xstrdup(fwd->listen_path);
+                        permitted_opens[idx].listen_port = PORT_STREAMLOCAL;
+                } else {
+                        permitted_opens[idx].listen_host =
+                            fwd->listen_host ? xstrdup(fwd->listen_host) : NULL;
+                        permitted_opens[idx].listen_path = NULL;
+                        permitted_opens[idx].listen_port = fwd->listen_port;
+                }
         }
         return (idx);
 }
 
 static int
 open_match(ForwardPermission *allowed_open, const char *requestedhost,
-    u_short requestedport)
+    int requestedport)
 {
         if (allowed_open->host_to_connect == NULL)
                 return 0;
@@ -3067,14 +3268,14 @@ open_match(ForwardPermission *allowed_open, const char *requestedhost,
 }
 
 /*
- * Note that in he listen host/port case
+ * Note that in the listen host/port case
  * we don't support FWD_PERMIT_ANY_PORT and
  * need to translate between the configured-host (listen_host)
  * and what we've sent to the remote server (channel_rfwd_bind_host)
  */
 static int
-open_listen_match(ForwardPermission *allowed_open, const char *requestedhost,
-    u_short requestedport, int translate)
+open_listen_match_tcpip(ForwardPermission *allowed_open,
+    const char *requestedhost, u_short requestedport, int translate)
 {
         const char *allowed_host;
 
@@ -3094,12 +3295,26 @@ open_listen_match(ForwardPermission *allowed_open, const char *requestedhost,
         return 1;
 }
 
+static int
+open_listen_match_streamlocal(ForwardPermission *allowed_open,
+    const char *requestedpath)
+{
+        if (allowed_open->host_to_connect == NULL)
+                return 0;
+        if (allowed_open->listen_port != PORT_STREAMLOCAL)
+                return 0;
+        if (allowed_open->listen_path == NULL ||
+            strcmp(allowed_open->listen_path, requestedpath) != 0)
+                return 0;
+        return 1;
+}
+
 /*
  * Request cancellation of remote forwarding of connection host:port from
  * local side.
  */
-int
-channel_request_rforward_cancel(const char *host, u_short port)
+static int
+channel_request_rforward_cancel_tcpip(const char *host, u_short port)
 {
         int i;
 
@@ -3107,7 +3322,7 @@ channel_request_rforward_cancel(const char *host, u_short port)
                 return -1;
 
         for (i = 0; i < num_permitted_opens; i++) {
-                if (open_listen_match(&permitted_opens[i], host, port, 0))
+                if (open_listen_match_tcpip(&permitted_opens[i], host, port, 0))
                         break;
         }
         if (i >= num_permitted_opens) {
@@ -3121,15 +3336,68 @@ channel_request_rforward_cancel(const char *host, u_short port)
         packet_put_int(port);
         packet_send();
 
-        permitted_opens[i].port_to_connect = 0;
         permitted_opens[i].listen_port = 0;
+        permitted_opens[i].port_to_connect = 0;
         free(permitted_opens[i].host_to_connect);
         permitted_opens[i].host_to_connect = NULL;
         free(permitted_opens[i].listen_host);
         permitted_opens[i].listen_host = NULL;
+        permitted_opens[i].listen_path = NULL;
+
+        return 0;
+}
+
+/*
+ * Request cancellation of remote forwarding of Unix domain socket
+ * path from local side.
+ */
+static int
+channel_request_rforward_cancel_streamlocal(const char *path)
+{
+        int i;
+
+        if (!compat20)
+                return -1;
+
+        for (i = 0; i < num_permitted_opens; i++) {
+                if (open_listen_match_streamlocal(&permitted_opens[i], path))
+                        break;
+        }
+        if (i >= num_permitted_opens) {
+                debug("%s: requested forward not found", __func__);
+                return -1;
+        }
+        packet_start(SSH2_MSG_GLOBAL_REQUEST);
+        packet_put_cstring("cancel-streamlocal-forward@openssh.com");
+        packet_put_char(0);
+        packet_put_cstring(path);
+        packet_send();
+
+        permitted_opens[i].listen_port = 0;
+        permitted_opens[i].port_to_connect = 0;
+        free(permitted_opens[i].host_to_connect);
+        permitted_opens[i].host_to_connect = NULL;
+        permitted_opens[i].listen_host = NULL;
+        free(permitted_opens[i].listen_path);
+        permitted_opens[i].listen_path = NULL;
 
         return 0;
 }
+ 
+/*
+ * Request cancellation of remote forwarding of a connection from local side.
+ */
+int
+channel_request_rforward_cancel(struct Forward *fwd)
+{
+        if (fwd->listen_path != NULL) {
+                return (channel_request_rforward_cancel_streamlocal(
+                    fwd->listen_path));
+        } else {
+                return (channel_request_rforward_cancel_tcpip(fwd->listen_host,
+                    fwd->listen_port ? fwd->listen_port : fwd->allocated_port));
+        }
+}
 
 /*
  * This is called after receiving CHANNEL_FORWARDING_REQUEST.  This initates
@@ -3137,36 +3405,35 @@ channel_request_rforward_cancel(const char *host, u_short port)
  * message if there was an error).
  */
 int
-channel_input_port_forward_request(int is_root, int gateway_ports)
+channel_input_port_forward_request(int is_root, struct ForwardOptions *fwd_opts)
 {
-        u_short port, host_port;
         int success = 0;
-        char *hostname;
+        struct Forward fwd;
 
         /* Get arguments from the packet. */
-        port = packet_get_int();
-        hostname = packet_get_string(NULL);
-        host_port = packet_get_int();
+        memset(&fwd, 0, sizeof(fwd));
+        fwd.listen_port = packet_get_int();
+        fwd.connect_host = packet_get_string(NULL);
+        fwd.connect_port = packet_get_int();
 
 #ifndef HAVE_CYGWIN
         /*
          * Check that an unprivileged user is not trying to forward a
          * privileged port.
          */
-        if (port < IPPORT_RESERVED && !is_root)
+        if (fwd.listen_port < IPPORT_RESERVED && !is_root)
                 packet_disconnect(
                     "Requested forwarding of port %d but user is not root.",
-                    port);
-        if (host_port == 0)
+                    fwd.listen_port);
+        if (fwd.connect_port == 0)
                 packet_disconnect("Dynamic forwarding denied.");
 #endif
 
         /* Initiate forwarding */
-        success = channel_setup_local_fwd_listener(NULL, port, hostname,
-            host_port, gateway_ports);
+        success = channel_setup_local_fwd_listener(&fwd, fwd_opts);
 
         /* Free the argument string. */
-        free(hostname);
+        free(fwd.connect_host);
 
         return (success ? 0 : -1);
 }
@@ -3193,6 +3460,7 @@ channel_add_permitted_opens(char *host, int port)
         permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
         permitted_opens[num_permitted_opens].port_to_connect = port;
         permitted_opens[num_permitted_opens].listen_host = NULL;
+        permitted_opens[num_permitted_opens].listen_path = NULL;
         permitted_opens[num_permitted_opens].listen_port = 0;
         num_permitted_opens++;
 
@@ -3227,6 +3495,8 @@ channel_update_permitted_opens(int idx, int newport)
                 permitted_opens[idx].host_to_connect = NULL;
                 free(permitted_opens[idx].listen_host);
                 permitted_opens[idx].listen_host = NULL;
+                free(permitted_opens[idx].listen_path);
+                permitted_opens[idx].listen_path = NULL;
         }
 }
 
@@ -3241,6 +3511,7 @@ channel_add_adm_permitted_opens(char *host, int port)
              = xstrdup(host);
         permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port;
         permitted_adm_opens[num_adm_permitted_opens].listen_host = NULL;
+        permitted_adm_opens[num_adm_permitted_opens].listen_path = NULL;
         permitted_adm_opens[num_adm_permitted_opens].listen_port = 0;
         return ++num_adm_permitted_opens;
 }
@@ -3262,6 +3533,7 @@ channel_clear_permitted_opens(void)
         for (i = 0; i < num_permitted_opens; i++) {
                 free(permitted_opens[i].host_to_connect);
                 free(permitted_opens[i].listen_host);
+                free(permitted_opens[i].listen_path);
         }
         free(permitted_opens);
         permitted_opens = NULL;
@@ -3276,6 +3548,7 @@ channel_clear_adm_permitted_opens(void)
         for (i = 0; i < num_adm_permitted_opens; i++) {
                 free(permitted_adm_opens[i].host_to_connect);
                 free(permitted_adm_opens[i].listen_host);
+                free(permitted_adm_opens[i].listen_path);
         }
         free(permitted_adm_opens);
         permitted_adm_opens = NULL;
@@ -3319,16 +3592,27 @@ static int
 connect_next(struct channel_connect *cctx)
 {
         int sock, saved_errno;
-        char ntop[NI_MAXHOST], strport[NI_MAXSERV];
+        struct sockaddr_un *sunaddr;
+        char ntop[NI_MAXHOST], strport[MAX(NI_MAXSERV,sizeof(sunaddr->sun_path))];
 
         for (; cctx->ai; cctx->ai = cctx->ai->ai_next) {
-                if (cctx->ai->ai_family != AF_INET &&
-                    cctx->ai->ai_family != AF_INET6)
-                        continue;
-                if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen,
-                    ntop, sizeof(ntop), strport, sizeof(strport),
-                    NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
-                        error("connect_next: getnameinfo failed");
+                switch (cctx->ai->ai_family) {
+                case AF_UNIX:
+                        /* unix:pathname instead of host:port */
+                        sunaddr = (struct sockaddr_un *)cctx->ai->ai_addr;
+                        strlcpy(ntop, "unix", sizeof(ntop));
+                        strlcpy(strport, sunaddr->sun_path, sizeof(strport));
+                        break;
+                case AF_INET:
+                case AF_INET6:
+                        if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen,
+                            ntop, sizeof(ntop), strport, sizeof(strport),
+                            NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
+                                error("connect_next: getnameinfo failed");
+                                continue;
+                        }
+                        break;
+                default:
                         continue;
                 }
                 if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype,
@@ -3351,10 +3635,11 @@ connect_next(struct channel_connect *cctx)
                         errno = saved_errno;
                         continue;       /* fail -- try next */
                 }
+                if (cctx->ai->ai_family != AF_UNIX)
+                        set_nodelay(sock);
                 debug("connect_next: host %.100s ([%.100s]:%s) "
                     "in progress, fd=%d", cctx->host, ntop, strport, sock);
                 cctx->ai = cctx->ai->ai_next;
-                set_nodelay(sock);
                 return sock;
         }
         return -1;
@@ -3364,14 +3649,18 @@ static void
 channel_connect_ctx_free(struct channel_connect *cctx)
 {
         free(cctx->host);
-        if (cctx->aitop)
-                freeaddrinfo(cctx->aitop);
+        if (cctx->aitop) {
+                if (cctx->aitop->ai_family == AF_UNIX)
+                        free(cctx->aitop);
+                else
+                        freeaddrinfo(cctx->aitop);
+        }
         memset(cctx, 0, sizeof(*cctx));
 }
 
-/* Return CONNECTING channel to remote host, port */
+/* Return CONNECTING channel to remote host:port or local socket path */
 static Channel *
-connect_to(const char *host, u_short port, char *ctype, char *rname)
+connect_to(const char *name, int port, char *ctype, char *rname)
 {
         struct addrinfo hints;
         int gaierr;
@@ -3381,23 +3670,51 @@ connect_to(const char *host, u_short port, char *ctype, char *rname)
         Channel *c;
 
         memset(&cctx, 0, sizeof(cctx));
-        memset(&hints, 0, sizeof(hints));
-        hints.ai_family = IPv4or6;
-        hints.ai_socktype = SOCK_STREAM;
-        snprintf(strport, sizeof strport, "%d", port);
-        if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) {
-                error("connect_to %.100s: unknown host (%s)", host,
-                    ssh_gai_strerror(gaierr));
-                return NULL;
+
+        if (port == PORT_STREAMLOCAL) {
+                struct sockaddr_un *sunaddr;
+                struct addrinfo *ai;
+
+                if (strlen(name) > sizeof(sunaddr->sun_path)) {
+                        error("%.100s: %.100s", name, strerror(ENAMETOOLONG));
+                        return (NULL);
+                }
+
+                /*
+                 * Fake up a struct addrinfo for AF_UNIX connections.
+                 * channel_connect_ctx_free() must check ai_family
+                 * and use free() not freeaddirinfo() for AF_UNIX.
+                 */
+                ai = xmalloc(sizeof(*ai) + sizeof(*sunaddr));
+                memset(ai, 0, sizeof(*ai) + sizeof(*sunaddr));
+                ai->ai_addr = (struct sockaddr *)(ai + 1);
+                ai->ai_addrlen = sizeof(*sunaddr);
+                ai->ai_family = AF_UNIX;
+                ai->ai_socktype = SOCK_STREAM;
+                ai->ai_protocol = PF_UNSPEC;
+                sunaddr = (struct sockaddr_un *)ai->ai_addr;
+                sunaddr->sun_family = AF_UNIX;
+                strlcpy(sunaddr->sun_path, name, sizeof(sunaddr->sun_path));
+                cctx.aitop = ai;
+        } else {
+                memset(&hints, 0, sizeof(hints));
+                hints.ai_family = IPv4or6;
+                hints.ai_socktype = SOCK_STREAM;
+                snprintf(strport, sizeof strport, "%d", port);
+                if ((gaierr = getaddrinfo(name, strport, &hints, &cctx.aitop)) != 0) {
+                        error("connect_to %.100s: unknown host (%s)", name,
+                            ssh_gai_strerror(gaierr));
+                        return NULL;
+                }
         }
 
-        cctx.host = xstrdup(host);
+        cctx.host = xstrdup(name);
         cctx.port = port;
         cctx.ai = cctx.aitop;
 
         if ((sock = connect_next(&cctx)) == -1) {
                 error("connect to %.100s port %d failed: %s",
-                    host, port, strerror(errno));
+                    name, port, strerror(errno));
                 channel_connect_ctx_free(&cctx);
                 return NULL;
         }
@@ -3414,7 +3731,7 @@ channel_connect_by_listen_address(const char *listen_host,
         int i;
 
         for (i = 0; i < num_permitted_opens; i++) {
-                if (open_listen_match(&permitted_opens[i], listen_host,
+                if (open_listen_match_tcpip(&permitted_opens[i], listen_host,
                     listen_port, 1)) {
                         return connect_to(
                             permitted_opens[i].host_to_connect,
@@ -3426,9 +3743,26 @@ channel_connect_by_listen_address(const char *listen_host,
         return NULL;
 }
 
+Channel *
+channel_connect_by_listen_path(const char *path, char *ctype, char *rname)
+{
+        int i;
+
+        for (i = 0; i < num_permitted_opens; i++) {
+                if (open_listen_match_streamlocal(&permitted_opens[i], path)) {
+                        return connect_to(
+                            permitted_opens[i].host_to_connect,
+                            permitted_opens[i].port_to_connect, ctype, rname);
+                }
+        }
+        error("WARNING: Server requests forwarding for unknown path %.100s",
+            path);
+        return NULL;
+}
+
 /* Check if connecting to that port is permitted and connect. */
 Channel *
-channel_connect_to(const char *host, u_short port, char *ctype, char *rname)
+channel_connect_to_port(const char *host, u_short port, char *ctype, char *rname)
 {
         int i, permit, permit_adm = 1;
 
@@ -3458,6 +3792,38 @@ channel_connect_to(const char *host, u_short port, char *ctype, char *rname)
         return connect_to(host, port, ctype, rname);
 }
 
+/* Check if connecting to that path is permitted and connect. */
+Channel *
+channel_connect_to_path(const char *path, char *ctype, char *rname)
+{
+        int i, permit, permit_adm = 1;
+
+        permit = all_opens_permitted;
+        if (!permit) {
+                for (i = 0; i < num_permitted_opens; i++)
+                        if (open_match(&permitted_opens[i], path, PORT_STREAMLOCAL)) {
+                                permit = 1;
+                                break;
+                        }
+        }
+
+        if (num_adm_permitted_opens > 0) {
+                permit_adm = 0;
+                for (i = 0; i < num_adm_permitted_opens; i++)
+                        if (open_match(&permitted_adm_opens[i], path, PORT_STREAMLOCAL)) {
+                                permit_adm = 1;
+                                break;
+                        }
+        }
+
+        if (!permit || !permit_adm) {
+                logit("Received request to connect to path %.100s, "
+                    "but the request was denied.", path);
+                return NULL;
+        }
+        return connect_to(path, PORT_STREAMLOCAL, ctype, rname);
+}
+
 void
 channel_send_window_changes(void)
 {