File: | src/usr.bin/ssh/ssh/../mux.c |
Warning: | line 848, column 7 Although the value stored to 'r' is used in the enclosing expression, the value is never actually read from 'r' |
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1 | /* $OpenBSD: mux.c,v 1.92 2022/01/11 01:26:47 djm Exp $ */ |
2 | /* |
3 | * Copyright (c) 2002-2008 Damien Miller <djm@openbsd.org> |
4 | * |
5 | * Permission to use, copy, modify, and distribute this software for any |
6 | * purpose with or without fee is hereby granted, provided that the above |
7 | * copyright notice and this permission notice appear in all copies. |
8 | * |
9 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
15 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
16 | */ |
17 | |
18 | /* ssh session multiplexing support */ |
19 | |
20 | #include <sys/types.h> |
21 | #include <sys/queue.h> |
22 | #include <sys/stat.h> |
23 | #include <sys/socket.h> |
24 | #include <sys/un.h> |
25 | |
26 | #include <errno(*__errno()).h> |
27 | #include <fcntl.h> |
28 | #include <poll.h> |
29 | #include <signal.h> |
30 | #include <stdarg.h> |
31 | #include <stddef.h> |
32 | #include <stdlib.h> |
33 | #include <stdio.h> |
34 | #include <string.h> |
35 | #include <unistd.h> |
36 | #include <util.h> |
37 | #include <paths.h> |
38 | |
39 | #include "atomicio.h" |
40 | #include "xmalloc.h" |
41 | #include "log.h" |
42 | #include "ssh.h" |
43 | #include "ssh2.h" |
44 | #include "pathnames.h" |
45 | #include "misc.h" |
46 | #include "match.h" |
47 | #include "sshbuf.h" |
48 | #include "channels.h" |
49 | #include "msg.h" |
50 | #include "packet.h" |
51 | #include "monitor_fdpass.h" |
52 | #include "sshpty.h" |
53 | #include "sshkey.h" |
54 | #include "readconf.h" |
55 | #include "clientloop.h" |
56 | #include "ssherr.h" |
57 | |
58 | /* from ssh.c */ |
59 | extern int tty_flag; |
60 | extern Options options; |
61 | extern char *host; |
62 | extern struct sshbuf *command; |
63 | extern volatile sig_atomic_t quit_pending; |
64 | |
65 | /* Context for session open confirmation callback */ |
66 | struct mux_session_confirm_ctx { |
67 | u_int want_tty; |
68 | u_int want_subsys; |
69 | u_int want_x_fwd; |
70 | u_int want_agent_fwd; |
71 | struct sshbuf *cmd; |
72 | char *term; |
73 | struct termios tio; |
74 | char **env; |
75 | u_int rid; |
76 | }; |
77 | |
78 | /* Context for stdio fwd open confirmation callback */ |
79 | struct mux_stdio_confirm_ctx { |
80 | u_int rid; |
81 | }; |
82 | |
83 | /* Context for global channel callback */ |
84 | struct mux_channel_confirm_ctx { |
85 | u_int cid; /* channel id */ |
86 | u_int rid; /* request id */ |
87 | int fid; /* forward id */ |
88 | }; |
89 | |
90 | /* fd to control socket */ |
91 | int muxserver_sock = -1; |
92 | |
93 | /* client request id */ |
94 | u_int muxclient_request_id = 0; |
95 | |
96 | /* Multiplexing control command */ |
97 | u_int muxclient_command = 0; |
98 | |
99 | /* Set when signalled. */ |
100 | static volatile sig_atomic_t muxclient_terminate = 0; |
101 | |
102 | /* PID of multiplex server */ |
103 | static u_int muxserver_pid = 0; |
104 | |
105 | static Channel *mux_listener_channel = NULL((void*)0); |
106 | |
107 | struct mux_master_state { |
108 | int hello_rcvd; |
109 | }; |
110 | |
111 | /* mux protocol messages */ |
112 | #define MUX_MSG_HELLO0x00000001 0x00000001 |
113 | #define MUX_C_NEW_SESSION0x10000002 0x10000002 |
114 | #define MUX_C_ALIVE_CHECK0x10000004 0x10000004 |
115 | #define MUX_C_TERMINATE0x10000005 0x10000005 |
116 | #define MUX_C_OPEN_FWD0x10000006 0x10000006 |
117 | #define MUX_C_CLOSE_FWD0x10000007 0x10000007 |
118 | #define MUX_C_NEW_STDIO_FWD0x10000008 0x10000008 |
119 | #define MUX_C_STOP_LISTENING0x10000009 0x10000009 |
120 | #define MUX_C_PROXY0x1000000f 0x1000000f |
121 | #define MUX_S_OK0x80000001 0x80000001 |
122 | #define MUX_S_PERMISSION_DENIED0x80000002 0x80000002 |
123 | #define MUX_S_FAILURE0x80000003 0x80000003 |
124 | #define MUX_S_EXIT_MESSAGE0x80000004 0x80000004 |
125 | #define MUX_S_ALIVE0x80000005 0x80000005 |
126 | #define MUX_S_SESSION_OPENED0x80000006 0x80000006 |
127 | #define MUX_S_REMOTE_PORT0x80000007 0x80000007 |
128 | #define MUX_S_TTY_ALLOC_FAIL0x80000008 0x80000008 |
129 | #define MUX_S_PROXY0x8000000f 0x8000000f |
130 | |
131 | /* type codes for MUX_C_OPEN_FWD and MUX_C_CLOSE_FWD */ |
132 | #define MUX_FWD_LOCAL1 1 |
133 | #define MUX_FWD_REMOTE2 2 |
134 | #define MUX_FWD_DYNAMIC3 3 |
135 | |
136 | static void mux_session_confirm(struct ssh *, int, int, void *); |
137 | static void mux_stdio_confirm(struct ssh *, int, int, void *); |
138 | |
139 | static int mux_master_process_hello(struct ssh *, u_int, |
140 | Channel *, struct sshbuf *, struct sshbuf *); |
141 | static int mux_master_process_new_session(struct ssh *, u_int, |
142 | Channel *, struct sshbuf *, struct sshbuf *); |
143 | static int mux_master_process_alive_check(struct ssh *, u_int, |
144 | Channel *, struct sshbuf *, struct sshbuf *); |
145 | static int mux_master_process_terminate(struct ssh *, u_int, |
146 | Channel *, struct sshbuf *, struct sshbuf *); |
147 | static int mux_master_process_open_fwd(struct ssh *, u_int, |
148 | Channel *, struct sshbuf *, struct sshbuf *); |
149 | static int mux_master_process_close_fwd(struct ssh *, u_int, |
150 | Channel *, struct sshbuf *, struct sshbuf *); |
151 | static int mux_master_process_stdio_fwd(struct ssh *, u_int, |
152 | Channel *, struct sshbuf *, struct sshbuf *); |
153 | static int mux_master_process_stop_listening(struct ssh *, u_int, |
154 | Channel *, struct sshbuf *, struct sshbuf *); |
155 | static int mux_master_process_proxy(struct ssh *, u_int, |
156 | Channel *, struct sshbuf *, struct sshbuf *); |
157 | |
158 | static const struct { |
159 | u_int type; |
160 | int (*handler)(struct ssh *, u_int, Channel *, |
161 | struct sshbuf *, struct sshbuf *); |
162 | } mux_master_handlers[] = { |
163 | { MUX_MSG_HELLO0x00000001, mux_master_process_hello }, |
164 | { MUX_C_NEW_SESSION0x10000002, mux_master_process_new_session }, |
165 | { MUX_C_ALIVE_CHECK0x10000004, mux_master_process_alive_check }, |
166 | { MUX_C_TERMINATE0x10000005, mux_master_process_terminate }, |
167 | { MUX_C_OPEN_FWD0x10000006, mux_master_process_open_fwd }, |
168 | { MUX_C_CLOSE_FWD0x10000007, mux_master_process_close_fwd }, |
169 | { MUX_C_NEW_STDIO_FWD0x10000008, mux_master_process_stdio_fwd }, |
170 | { MUX_C_STOP_LISTENING0x10000009, mux_master_process_stop_listening }, |
171 | { MUX_C_PROXY0x1000000f, mux_master_process_proxy }, |
172 | { 0, NULL((void*)0) } |
173 | }; |
174 | |
175 | /* Cleanup callback fired on closure of mux client _session_ channel */ |
176 | /* ARGSUSED */ |
177 | static void |
178 | mux_master_session_cleanup_cb(struct ssh *ssh, int cid, void *unused) |
179 | { |
180 | Channel *cc, *c = channel_by_id(ssh, cid); |
181 | |
182 | debug3_f("entering for channel %d", cid)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 182, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering for channel %d", cid ); |
183 | if (c == NULL((void*)0)) |
184 | fatal_f("channel_by_id(%i) == NULL", cid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 184, 1 , SYSLOG_LEVEL_FATAL, ((void*)0), "channel_by_id(%i) == NULL" , cid); |
185 | if (c->ctl_chan != -1) { |
186 | if ((cc = channel_by_id(ssh, c->ctl_chan)) == NULL((void*)0)) |
187 | fatal_f("channel %d missing control channel %d",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 188, 1 , SYSLOG_LEVEL_FATAL, ((void*)0), "channel %d missing control channel %d" , c->self, c->ctl_chan) |
188 | c->self, c->ctl_chan)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 188, 1 , SYSLOG_LEVEL_FATAL, ((void*)0), "channel %d missing control channel %d" , c->self, c->ctl_chan); |
189 | c->ctl_chan = -1; |
190 | cc->remote_id = 0; |
191 | cc->have_remote_id = 0; |
192 | chan_rcvd_oclose(ssh, cc); |
193 | } |
194 | channel_cancel_cleanup(ssh, c->self); |
195 | } |
196 | |
197 | /* Cleanup callback fired on closure of mux client _control_ channel */ |
198 | /* ARGSUSED */ |
199 | static void |
200 | mux_master_control_cleanup_cb(struct ssh *ssh, int cid, void *unused) |
201 | { |
202 | Channel *sc, *c = channel_by_id(ssh, cid); |
203 | |
204 | debug3_f("entering for channel %d", cid)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 204, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering for channel %d", cid ); |
205 | if (c == NULL((void*)0)) |
206 | fatal_f("channel_by_id(%i) == NULL", cid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 206, 1 , SYSLOG_LEVEL_FATAL, ((void*)0), "channel_by_id(%i) == NULL" , cid); |
207 | if (c->have_remote_id) { |
208 | if ((sc = channel_by_id(ssh, c->remote_id)) == NULL((void*)0)) |
209 | fatal_f("channel %d missing session channel %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 210, 1 , SYSLOG_LEVEL_FATAL, ((void*)0), "channel %d missing session channel %u" , c->self, c->remote_id) |
210 | c->self, c->remote_id)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 210, 1 , SYSLOG_LEVEL_FATAL, ((void*)0), "channel %d missing session channel %u" , c->self, c->remote_id); |
211 | c->remote_id = 0; |
212 | c->have_remote_id = 0; |
213 | sc->ctl_chan = -1; |
214 | if (sc->type != SSH_CHANNEL_OPEN4 && |
215 | sc->type != SSH_CHANNEL_OPENING3) { |
216 | debug2_f("channel %d: not open", sc->self)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 216, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel %d: not open", sc-> self); |
217 | chan_mark_dead(ssh, sc); |
218 | } else { |
219 | if (sc->istate == CHAN_INPUT_OPEN0) |
220 | chan_read_failed(ssh, sc); |
221 | if (sc->ostate == CHAN_OUTPUT_OPEN0) |
222 | chan_write_failed(ssh, sc); |
223 | } |
224 | } |
225 | channel_cancel_cleanup(ssh, c->self); |
226 | } |
227 | |
228 | /* Check mux client environment variables before passing them to mux master. */ |
229 | static int |
230 | env_permitted(char *env) |
231 | { |
232 | int i, ret; |
233 | char name[1024], *cp; |
234 | |
235 | if ((cp = strchr(env, '=')) == NULL((void*)0) || cp == env) |
236 | return 0; |
237 | ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env); |
238 | if (ret <= 0 || (size_t)ret >= sizeof(name)) { |
239 | error_f("name '%.100s...' too long", env)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 239, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "name '%.100s...' too long", env); |
240 | return 0; |
241 | } |
242 | |
243 | for (i = 0; i < options.num_send_env; i++) |
244 | if (match_pattern(name, options.send_env[i])) |
245 | return 1; |
246 | |
247 | return 0; |
248 | } |
249 | |
250 | /* Mux master protocol message handlers */ |
251 | |
252 | static int |
253 | mux_master_process_hello(struct ssh *ssh, u_int rid, |
254 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
255 | { |
256 | u_int ver; |
257 | struct mux_master_state *state = (struct mux_master_state *)c->mux_ctx; |
258 | int r; |
259 | |
260 | if (state == NULL((void*)0)) |
261 | fatal_f("channel %d: c->mux_ctx == NULL", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 261, 1 , SYSLOG_LEVEL_FATAL, ((void*)0), "channel %d: c->mux_ctx == NULL" , c->self); |
262 | if (state->hello_rcvd) { |
263 | error_f("HELLO received twice")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 263, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "HELLO received twice"); |
264 | return -1; |
265 | } |
266 | if ((r = sshbuf_get_u32(m, &ver)) != 0) { |
267 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 267, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
268 | return -1; |
269 | } |
270 | if (ver != SSHMUX_VER4) { |
271 | error_f("unsupported multiplexing protocol version %u "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 272, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "unsupported multiplexing protocol version %u " "(expected %u)", ver, 4) |
272 | "(expected %u)", ver, SSHMUX_VER)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 272, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "unsupported multiplexing protocol version %u " "(expected %u)", ver, 4); |
273 | return -1; |
274 | } |
275 | debug2_f("channel %d client version %u", c->self, ver)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 275, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel %d client version %u" , c->self, ver); |
276 | |
277 | /* No extensions are presently defined */ |
278 | while (sshbuf_len(m) > 0) { |
279 | char *name = NULL((void*)0); |
280 | size_t value_len = 0; |
281 | |
282 | if ((r = sshbuf_get_cstring(m, &name, NULL((void*)0))) != 0 || |
283 | (r = sshbuf_get_string_direct(m, NULL((void*)0), &value_len)) != 0) { |
284 | error_fr(r, "parse extension")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 284, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse extension"); |
285 | return -1; |
286 | } |
287 | debug2_f("Unrecognised extension \"%s\" length %zu",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 288, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "Unrecognised extension \"%s\" length %zu" , name, value_len) |
288 | name, value_len)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 288, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "Unrecognised extension \"%s\" length %zu" , name, value_len); |
289 | free(name); |
290 | } |
291 | state->hello_rcvd = 1; |
292 | return 0; |
293 | } |
294 | |
295 | /* Enqueue a "ok" response to the reply buffer */ |
296 | static void |
297 | reply_ok(struct sshbuf *reply, u_int rid) |
298 | { |
299 | int r; |
300 | |
301 | if ((r = sshbuf_put_u32(reply, MUX_S_OK0x80000001)) != 0 || |
302 | (r = sshbuf_put_u32(reply, rid)) != 0) |
303 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 303, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
304 | } |
305 | |
306 | /* Enqueue an error response to the reply buffer */ |
307 | static void |
308 | reply_error(struct sshbuf *reply, u_int type, u_int rid, const char *msg) |
309 | { |
310 | int r; |
311 | |
312 | if ((r = sshbuf_put_u32(reply, type)) != 0 || |
313 | (r = sshbuf_put_u32(reply, rid)) != 0 || |
314 | (r = sshbuf_put_cstring(reply, msg)) != 0) |
315 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 315, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
316 | } |
317 | |
318 | static int |
319 | mux_master_process_new_session(struct ssh *ssh, u_int rid, |
320 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
321 | { |
322 | Channel *nc; |
323 | struct mux_session_confirm_ctx *cctx; |
324 | char *cmd, *cp; |
325 | u_int i, j, env_len, escape_char, window, packetmax; |
326 | int r, new_fd[3]; |
327 | |
328 | /* Reply for SSHMUX_COMMAND_OPEN */ |
329 | cctx = xcalloc(1, sizeof(*cctx)); |
330 | cctx->term = NULL((void*)0); |
331 | cctx->rid = rid; |
332 | cmd = NULL((void*)0); |
333 | cctx->env = NULL((void*)0); |
334 | env_len = 0; |
335 | if ((r = sshbuf_skip_string(m)sshbuf_get_string_direct(m, ((void*)0), ((void*)0))) != 0 || /* reserved */ |
336 | (r = sshbuf_get_u32(m, &cctx->want_tty)) != 0 || |
337 | (r = sshbuf_get_u32(m, &cctx->want_x_fwd)) != 0 || |
338 | (r = sshbuf_get_u32(m, &cctx->want_agent_fwd)) != 0 || |
339 | (r = sshbuf_get_u32(m, &cctx->want_subsys)) != 0 || |
340 | (r = sshbuf_get_u32(m, &escape_char)) != 0 || |
341 | (r = sshbuf_get_cstring(m, &cctx->term, NULL((void*)0))) != 0 || |
342 | (r = sshbuf_get_cstring(m, &cmd, NULL((void*)0))) != 0) { |
343 | malf: |
344 | free(cmd); |
345 | for (j = 0; j < env_len; j++) |
346 | free(cctx->env[j]); |
347 | free(cctx->env); |
348 | free(cctx->term); |
349 | free(cctx); |
350 | error_f("malformed message")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 350, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "malformed message"); |
351 | return -1; |
352 | } |
353 | |
354 | #define MUX_MAX_ENV_VARS4096 4096 |
355 | while (sshbuf_len(m) > 0) { |
356 | if ((r = sshbuf_get_cstring(m, &cp, NULL((void*)0))) != 0) |
357 | goto malf; |
358 | if (!env_permitted(cp)) { |
359 | free(cp); |
360 | continue; |
361 | } |
362 | cctx->env = xreallocarray(cctx->env, env_len + 2, |
363 | sizeof(*cctx->env)); |
364 | cctx->env[env_len++] = cp; |
365 | cctx->env[env_len] = NULL((void*)0); |
366 | if (env_len > MUX_MAX_ENV_VARS4096) { |
367 | error_f(">%d environment variables received, "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 368, 1, SYSLOG_LEVEL_ERROR, ((void*)0), ">%d environment variables received, " "ignoring additional", 4096) |
368 | "ignoring additional", MUX_MAX_ENV_VARS)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 368, 1, SYSLOG_LEVEL_ERROR, ((void*)0), ">%d environment variables received, " "ignoring additional", 4096); |
369 | break; |
370 | } |
371 | } |
372 | |
373 | debug2_f("channel %d: request tty %d, X %d, agent %d, subsys %d, "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 376, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel %d: request tty %d, X %d, agent %d, subsys %d, " "term \"%s\", cmd \"%s\", env %u", c->self, cctx->want_tty , cctx->want_x_fwd, cctx->want_agent_fwd, cctx->want_subsys , cctx->term, cmd, env_len) |
374 | "term \"%s\", cmd \"%s\", env %u", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 376, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel %d: request tty %d, X %d, agent %d, subsys %d, " "term \"%s\", cmd \"%s\", env %u", c->self, cctx->want_tty , cctx->want_x_fwd, cctx->want_agent_fwd, cctx->want_subsys , cctx->term, cmd, env_len) |
375 | cctx->want_tty, cctx->want_x_fwd, cctx->want_agent_fwd,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 376, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel %d: request tty %d, X %d, agent %d, subsys %d, " "term \"%s\", cmd \"%s\", env %u", c->self, cctx->want_tty , cctx->want_x_fwd, cctx->want_agent_fwd, cctx->want_subsys , cctx->term, cmd, env_len) |
376 | cctx->want_subsys, cctx->term, cmd, env_len)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 376, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel %d: request tty %d, X %d, agent %d, subsys %d, " "term \"%s\", cmd \"%s\", env %u", c->self, cctx->want_tty , cctx->want_x_fwd, cctx->want_agent_fwd, cctx->want_subsys , cctx->term, cmd, env_len); |
377 | |
378 | if ((cctx->cmd = sshbuf_new()) == NULL((void*)0)) |
379 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 379, 1 , SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
380 | if ((r = sshbuf_put(cctx->cmd, cmd, strlen(cmd))) != 0) |
381 | fatal_fr(r, "sshbuf_put")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 381, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put"); |
382 | free(cmd); |
383 | cmd = NULL((void*)0); |
384 | |
385 | /* Gather fds from client */ |
386 | for(i = 0; i < 3; i++) { |
387 | if ((new_fd[i] = mm_receive_fd(c->sock)) == -1) { |
388 | error_f("failed to receive fd %d from client", i)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 388, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "failed to receive fd %d from client" , i); |
389 | for (j = 0; j < i; j++) |
390 | close(new_fd[j]); |
391 | for (j = 0; j < env_len; j++) |
392 | free(cctx->env[j]); |
393 | free(cctx->env); |
394 | free(cctx->term); |
395 | sshbuf_free(cctx->cmd); |
396 | free(cctx); |
397 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, |
398 | "did not receive file descriptors"); |
399 | return -1; |
400 | } |
401 | } |
402 | |
403 | debug3_f("got fds stdin %d, stdout %d, stderr %d",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 404, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "got fds stdin %d, stdout %d, stderr %d" , new_fd[0], new_fd[1], new_fd[2]) |
404 | new_fd[0], new_fd[1], new_fd[2])sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 404, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "got fds stdin %d, stdout %d, stderr %d" , new_fd[0], new_fd[1], new_fd[2]); |
405 | |
406 | /* XXX support multiple child sessions in future */ |
407 | if (c->have_remote_id) { |
408 | debug2_f("session already open")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 408, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "session already open"); |
409 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, |
410 | "Multiple sessions not supported"); |
411 | cleanup: |
412 | close(new_fd[0]); |
413 | close(new_fd[1]); |
414 | close(new_fd[2]); |
415 | free(cctx->term); |
416 | if (env_len != 0) { |
417 | for (i = 0; i < env_len; i++) |
418 | free(cctx->env[i]); |
419 | free(cctx->env); |
420 | } |
421 | sshbuf_free(cctx->cmd); |
422 | free(cctx); |
423 | return 0; |
424 | } |
425 | |
426 | if (options.control_master == SSHCTL_MASTER_ASK3 || |
427 | options.control_master == SSHCTL_MASTER_AUTO_ASK4) { |
428 | if (!ask_permission("Allow shared connection to %s? ", host)) { |
429 | debug2_f("session refused by user")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 429, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "session refused by user"); |
430 | reply_error(reply, MUX_S_PERMISSION_DENIED0x80000002, rid, |
431 | "Permission denied"); |
432 | goto cleanup; |
433 | } |
434 | } |
435 | |
436 | /* Try to pick up ttymodes from client before it goes raw */ |
437 | if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1) |
438 | error_f("tcgetattr: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 438, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "tcgetattr: %s", strerror((* __errno()))); |
439 | |
440 | window = CHAN_SES_WINDOW_DEFAULT(64*(32*1024)); |
441 | packetmax = CHAN_SES_PACKET_DEFAULT(32*1024); |
442 | if (cctx->want_tty) { |
443 | window >>= 1; |
444 | packetmax >>= 1; |
445 | } |
446 | |
447 | nc = channel_new(ssh, "session", SSH_CHANNEL_OPENING3, |
448 | new_fd[0], new_fd[1], new_fd[2], window, packetmax, |
449 | CHAN_EXTENDED_WRITE2, "client-session", CHANNEL_NONBLOCK_STDIO2); |
450 | |
451 | nc->ctl_chan = c->self; /* link session -> control channel */ |
452 | c->remote_id = nc->self; /* link control -> session channel */ |
453 | c->have_remote_id = 1; |
454 | |
455 | if (cctx->want_tty && escape_char != 0xffffffff) { |
456 | channel_register_filter(ssh, nc->self, |
457 | client_simple_escape_filter, NULL((void*)0), |
458 | client_filter_cleanup, |
459 | client_new_escape_filter_ctx((int)escape_char)); |
460 | } |
461 | |
462 | debug2_f("channel_new: %d linked to control channel %d",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 463, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel_new: %d linked to control channel %d" , nc->self, nc->ctl_chan) |
463 | nc->self, nc->ctl_chan)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 463, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel_new: %d linked to control channel %d" , nc->self, nc->ctl_chan); |
464 | |
465 | channel_send_open(ssh, nc->self); |
466 | channel_register_open_confirm(ssh, nc->self, mux_session_confirm, cctx); |
467 | c->mux_pause = 1; /* stop handling messages until open_confirm done */ |
468 | channel_register_cleanup(ssh, nc->self, |
469 | mux_master_session_cleanup_cb, 1); |
470 | |
471 | /* reply is deferred, sent by mux_session_confirm */ |
472 | return 0; |
473 | } |
474 | |
475 | static int |
476 | mux_master_process_alive_check(struct ssh *ssh, u_int rid, |
477 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
478 | { |
479 | int r; |
480 | |
481 | debug2_f("channel %d: alive check", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 481, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel %d: alive check", c ->self); |
482 | |
483 | /* prepare reply */ |
484 | if ((r = sshbuf_put_u32(reply, MUX_S_ALIVE0x80000005)) != 0 || |
485 | (r = sshbuf_put_u32(reply, rid)) != 0 || |
486 | (r = sshbuf_put_u32(reply, (u_int)getpid())) != 0) |
487 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 487, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
488 | |
489 | return 0; |
490 | } |
491 | |
492 | static int |
493 | mux_master_process_terminate(struct ssh *ssh, u_int rid, |
494 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
495 | { |
496 | debug2_f("channel %d: terminate request", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 496, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel %d: terminate request" , c->self); |
497 | |
498 | if (options.control_master == SSHCTL_MASTER_ASK3 || |
499 | options.control_master == SSHCTL_MASTER_AUTO_ASK4) { |
500 | if (!ask_permission("Terminate shared connection to %s? ", |
501 | host)) { |
502 | debug2_f("termination refused by user")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 502, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "termination refused by user" ); |
503 | reply_error(reply, MUX_S_PERMISSION_DENIED0x80000002, rid, |
504 | "Permission denied"); |
505 | return 0; |
506 | } |
507 | } |
508 | |
509 | quit_pending = 1; |
510 | reply_ok(reply, rid); |
511 | /* XXX exit happens too soon - message never makes it to client */ |
512 | return 0; |
513 | } |
514 | |
515 | static char * |
516 | format_forward(u_int ftype, struct Forward *fwd) |
517 | { |
518 | char *ret; |
519 | |
520 | switch (ftype) { |
521 | case MUX_FWD_LOCAL1: |
522 | xasprintf(&ret, "local forward %.200s:%d -> %.200s:%d", |
523 | (fwd->listen_path != NULL((void*)0)) ? fwd->listen_path : |
524 | (fwd->listen_host == NULL((void*)0)) ? |
525 | (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") : |
526 | fwd->listen_host, fwd->listen_port, |
527 | (fwd->connect_path != NULL((void*)0)) ? fwd->connect_path : |
528 | fwd->connect_host, fwd->connect_port); |
529 | break; |
530 | case MUX_FWD_DYNAMIC3: |
531 | xasprintf(&ret, "dynamic forward %.200s:%d -> *", |
532 | (fwd->listen_host == NULL((void*)0)) ? |
533 | (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") : |
534 | fwd->listen_host, fwd->listen_port); |
535 | break; |
536 | case MUX_FWD_REMOTE2: |
537 | xasprintf(&ret, "remote forward %.200s:%d -> %.200s:%d", |
538 | (fwd->listen_path != NULL((void*)0)) ? fwd->listen_path : |
539 | (fwd->listen_host == NULL((void*)0)) ? |
540 | "LOCALHOST" : fwd->listen_host, |
541 | fwd->listen_port, |
542 | (fwd->connect_path != NULL((void*)0)) ? fwd->connect_path : |
543 | fwd->connect_host, fwd->connect_port); |
544 | break; |
545 | default: |
546 | fatal_f("unknown forward type %u", ftype)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 546, 1 , SYSLOG_LEVEL_FATAL, ((void*)0), "unknown forward type %u", ftype ); |
547 | } |
548 | return ret; |
549 | } |
550 | |
551 | static int |
552 | compare_host(const char *a, const char *b) |
553 | { |
554 | if (a == NULL((void*)0) && b == NULL((void*)0)) |
555 | return 1; |
556 | if (a == NULL((void*)0) || b == NULL((void*)0)) |
557 | return 0; |
558 | return strcmp(a, b) == 0; |
559 | } |
560 | |
561 | static int |
562 | compare_forward(struct Forward *a, struct Forward *b) |
563 | { |
564 | if (!compare_host(a->listen_host, b->listen_host)) |
565 | return 0; |
566 | if (!compare_host(a->listen_path, b->listen_path)) |
567 | return 0; |
568 | if (a->listen_port != b->listen_port) |
569 | return 0; |
570 | if (!compare_host(a->connect_host, b->connect_host)) |
571 | return 0; |
572 | if (!compare_host(a->connect_path, b->connect_path)) |
573 | return 0; |
574 | if (a->connect_port != b->connect_port) |
575 | return 0; |
576 | |
577 | return 1; |
578 | } |
579 | |
580 | static void |
581 | mux_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt) |
582 | { |
583 | struct mux_channel_confirm_ctx *fctx = ctxt; |
584 | char *failmsg = NULL((void*)0); |
585 | struct Forward *rfwd; |
586 | Channel *c; |
587 | struct sshbuf *out; |
588 | u_int port; |
589 | int r; |
590 | |
591 | if ((c = channel_by_id(ssh, fctx->cid)) == NULL((void*)0)) { |
592 | /* no channel for reply */ |
593 | error_f("unknown channel")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 593, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "unknown channel"); |
594 | return; |
595 | } |
596 | if ((out = sshbuf_new()) == NULL((void*)0)) |
597 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 597, 1 , SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
598 | if (fctx->fid >= options.num_remote_forwards || |
599 | (options.remote_forwards[fctx->fid].connect_path == NULL((void*)0) && |
600 | options.remote_forwards[fctx->fid].connect_host == NULL((void*)0))) { |
601 | xasprintf(&failmsg, "unknown forwarding id %d", fctx->fid); |
602 | goto fail; |
603 | } |
604 | rfwd = &options.remote_forwards[fctx->fid]; |
605 | debug_f("%s for: listen %d, connect %s:%d",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 608, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "%s for: listen %d, connect %s:%d" , type == 81 ? "success" : "failure", rfwd->listen_port, rfwd ->connect_path ? rfwd->connect_path : rfwd->connect_host , rfwd->connect_port) |
606 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 608, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "%s for: listen %d, connect %s:%d" , type == 81 ? "success" : "failure", rfwd->listen_port, rfwd ->connect_path ? rfwd->connect_path : rfwd->connect_host , rfwd->connect_port) |
607 | rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 608, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "%s for: listen %d, connect %s:%d" , type == 81 ? "success" : "failure", rfwd->listen_port, rfwd ->connect_path ? rfwd->connect_path : rfwd->connect_host , rfwd->connect_port) |
608 | rfwd->connect_host, rfwd->connect_port)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 608, 1, SYSLOG_LEVEL_DEBUG1, ((void*)0), "%s for: listen %d, connect %s:%d" , type == 81 ? "success" : "failure", rfwd->listen_port, rfwd ->connect_path ? rfwd->connect_path : rfwd->connect_host , rfwd->connect_port); |
609 | if (type == SSH2_MSG_REQUEST_SUCCESS81) { |
610 | if (rfwd->listen_port == 0) { |
611 | if ((r = sshpkt_get_u32(ssh, &port)) != 0) |
612 | fatal_fr(r, "parse port")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 612, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "parse port"); |
613 | if (port > 65535) { |
614 | fatal("Invalid allocated port %u for "sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 616, 0 , SYSLOG_LEVEL_FATAL, ((void*)0), "Invalid allocated port %u for " "mux remote forward to %s:%d", port, rfwd->connect_host, rfwd ->connect_port) |
615 | "mux remote forward to %s:%d", port,sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 616, 0 , SYSLOG_LEVEL_FATAL, ((void*)0), "Invalid allocated port %u for " "mux remote forward to %s:%d", port, rfwd->connect_host, rfwd ->connect_port) |
616 | rfwd->connect_host, rfwd->connect_port)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 616, 0 , SYSLOG_LEVEL_FATAL, ((void*)0), "Invalid allocated port %u for " "mux remote forward to %s:%d", port, rfwd->connect_host, rfwd ->connect_port); |
617 | } |
618 | rfwd->allocated_port = (int)port; |
619 | debug("Allocated port %u for mux remote forward"sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 621, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Allocated port %u for mux remote forward" " to %s:%d", rfwd->allocated_port, rfwd->connect_host, rfwd->connect_port) |
620 | " to %s:%d", rfwd->allocated_port,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 621, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Allocated port %u for mux remote forward" " to %s:%d", rfwd->allocated_port, rfwd->connect_host, rfwd->connect_port) |
621 | rfwd->connect_host, rfwd->connect_port)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 621, 0, SYSLOG_LEVEL_DEBUG1, ((void*)0), "Allocated port %u for mux remote forward" " to %s:%d", rfwd->allocated_port, rfwd->connect_host, rfwd->connect_port); |
622 | if ((r = sshbuf_put_u32(out, |
623 | MUX_S_REMOTE_PORT0x80000007)) != 0 || |
624 | (r = sshbuf_put_u32(out, fctx->rid)) != 0 || |
625 | (r = sshbuf_put_u32(out, |
626 | rfwd->allocated_port)) != 0) |
627 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 627, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
628 | channel_update_permission(ssh, rfwd->handle, |
629 | rfwd->allocated_port); |
630 | } else { |
631 | reply_ok(out, fctx->rid); |
632 | } |
633 | goto out; |
634 | } else { |
635 | if (rfwd->listen_port == 0) |
636 | channel_update_permission(ssh, rfwd->handle, -1); |
637 | if (rfwd->listen_path != NULL((void*)0)) |
638 | xasprintf(&failmsg, "remote port forwarding failed for " |
639 | "listen path %s", rfwd->listen_path); |
640 | else |
641 | xasprintf(&failmsg, "remote port forwarding failed for " |
642 | "listen port %d", rfwd->listen_port); |
643 | |
644 | debug2_f("clearing registered forwarding for listen %d, "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 647, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "clearing registered forwarding for listen %d, " "connect %s:%d", rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path : rfwd->connect_host, rfwd->connect_port ) |
645 | "connect %s:%d", rfwd->listen_port,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 647, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "clearing registered forwarding for listen %d, " "connect %s:%d", rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path : rfwd->connect_host, rfwd->connect_port ) |
646 | rfwd->connect_path ? rfwd->connect_path :sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 647, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "clearing registered forwarding for listen %d, " "connect %s:%d", rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path : rfwd->connect_host, rfwd->connect_port ) |
647 | rfwd->connect_host, rfwd->connect_port)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 647, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "clearing registered forwarding for listen %d, " "connect %s:%d", rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path : rfwd->connect_host, rfwd->connect_port ); |
648 | |
649 | free(rfwd->listen_host); |
650 | free(rfwd->listen_path); |
651 | free(rfwd->connect_host); |
652 | free(rfwd->connect_path); |
653 | memset(rfwd, 0, sizeof(*rfwd)); |
654 | } |
655 | fail: |
656 | error_f("%s", failmsg)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 656, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "%s", failmsg); |
657 | reply_error(out, MUX_S_FAILURE0x80000003, fctx->rid, failmsg); |
658 | free(failmsg); |
659 | out: |
660 | if ((r = sshbuf_put_stringb(c->output, out)) != 0) |
661 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 661, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
662 | sshbuf_free(out); |
663 | if (c->mux_pause <= 0) |
664 | fatal_f("mux_pause %d", c->mux_pause)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 664, 1 , SYSLOG_LEVEL_FATAL, ((void*)0), "mux_pause %d", c->mux_pause ); |
665 | c->mux_pause = 0; /* start processing messages again */ |
666 | } |
667 | |
668 | static int |
669 | mux_master_process_open_fwd(struct ssh *ssh, u_int rid, |
670 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
671 | { |
672 | struct Forward fwd; |
673 | char *fwd_desc = NULL((void*)0); |
674 | char *listen_addr, *connect_addr; |
675 | u_int ftype; |
676 | u_int lport, cport; |
677 | int r, i, ret = 0, freefwd = 1; |
678 | |
679 | memset(&fwd, 0, sizeof(fwd)); |
680 | |
681 | /* XXX - lport/cport check redundant */ |
682 | if ((r = sshbuf_get_u32(m, &ftype)) != 0 || |
683 | (r = sshbuf_get_cstring(m, &listen_addr, NULL((void*)0))) != 0 || |
684 | (r = sshbuf_get_u32(m, &lport)) != 0 || |
685 | (r = sshbuf_get_cstring(m, &connect_addr, NULL((void*)0))) != 0 || |
686 | (r = sshbuf_get_u32(m, &cport)) != 0 || |
687 | (lport != (u_int)PORT_STREAMLOCAL-2 && lport > 65535) || |
688 | (cport != (u_int)PORT_STREAMLOCAL-2 && cport > 65535)) { |
689 | error_f("malformed message")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 689, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "malformed message"); |
690 | ret = -1; |
691 | goto out; |
692 | } |
693 | if (*listen_addr == '\0') { |
694 | free(listen_addr); |
695 | listen_addr = NULL((void*)0); |
696 | } |
697 | if (*connect_addr == '\0') { |
698 | free(connect_addr); |
699 | connect_addr = NULL((void*)0); |
700 | } |
701 | |
702 | memset(&fwd, 0, sizeof(fwd)); |
703 | fwd.listen_port = lport; |
704 | if (fwd.listen_port == PORT_STREAMLOCAL-2) |
705 | fwd.listen_path = listen_addr; |
706 | else |
707 | fwd.listen_host = listen_addr; |
708 | fwd.connect_port = cport; |
709 | if (fwd.connect_port == PORT_STREAMLOCAL-2) |
710 | fwd.connect_path = connect_addr; |
711 | else |
712 | fwd.connect_host = connect_addr; |
713 | |
714 | debug2_f("channel %d: request %s", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 715, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel %d: request %s", c ->self, (fwd_desc = format_forward(ftype, &fwd))) |
715 | (fwd_desc = format_forward(ftype, &fwd)))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 715, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel %d: request %s", c ->self, (fwd_desc = format_forward(ftype, &fwd))); |
716 | |
717 | if (ftype != MUX_FWD_LOCAL1 && ftype != MUX_FWD_REMOTE2 && |
718 | ftype != MUX_FWD_DYNAMIC3) { |
719 | logit_f("invalid forwarding type %u", ftype)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 719, 1, SYSLOG_LEVEL_INFO, ((void*)0), "invalid forwarding type %u", ftype); |
720 | invalid: |
721 | free(listen_addr); |
722 | free(connect_addr); |
723 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, |
724 | "Invalid forwarding request"); |
725 | return 0; |
726 | } |
727 | if (ftype == MUX_FWD_DYNAMIC3 && fwd.listen_path) { |
728 | logit_f("streamlocal and dynamic forwards "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 729, 1, SYSLOG_LEVEL_INFO, ((void*)0), "streamlocal and dynamic forwards " "are mutually exclusive") |
729 | "are mutually exclusive")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 729, 1, SYSLOG_LEVEL_INFO, ((void*)0), "streamlocal and dynamic forwards " "are mutually exclusive"); |
730 | goto invalid; |
731 | } |
732 | if (fwd.listen_port != PORT_STREAMLOCAL-2 && fwd.listen_port >= 65536) { |
733 | logit_f("invalid listen port %u", fwd.listen_port)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 733, 1, SYSLOG_LEVEL_INFO, ((void*)0), "invalid listen port %u", fwd .listen_port); |
734 | goto invalid; |
735 | } |
736 | if ((fwd.connect_port != PORT_STREAMLOCAL-2 && |
737 | fwd.connect_port >= 65536) || |
738 | (ftype != MUX_FWD_DYNAMIC3 && ftype != MUX_FWD_REMOTE2 && |
739 | fwd.connect_port == 0)) { |
740 | logit_f("invalid connect port %u",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 741, 1, SYSLOG_LEVEL_INFO, ((void*)0), "invalid connect port %u", fwd .connect_port) |
741 | fwd.connect_port)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 741, 1, SYSLOG_LEVEL_INFO, ((void*)0), "invalid connect port %u", fwd .connect_port); |
742 | goto invalid; |
743 | } |
744 | if (ftype != MUX_FWD_DYNAMIC3 && fwd.connect_host == NULL((void*)0) && |
745 | fwd.connect_path == NULL((void*)0)) { |
746 | logit_f("missing connect host")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 746, 1, SYSLOG_LEVEL_INFO, ((void*)0), "missing connect host"); |
747 | goto invalid; |
748 | } |
749 | |
750 | /* Skip forwards that have already been requested */ |
751 | switch (ftype) { |
752 | case MUX_FWD_LOCAL1: |
753 | case MUX_FWD_DYNAMIC3: |
754 | for (i = 0; i < options.num_local_forwards; i++) { |
755 | if (compare_forward(&fwd, |
756 | options.local_forwards + i)) { |
757 | exists: |
758 | debug2_f("found existing forwarding")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 758, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "found existing forwarding" ); |
759 | reply_ok(reply, rid); |
760 | goto out; |
761 | } |
762 | } |
763 | break; |
764 | case MUX_FWD_REMOTE2: |
765 | for (i = 0; i < options.num_remote_forwards; i++) { |
766 | if (!compare_forward(&fwd, options.remote_forwards + i)) |
767 | continue; |
768 | if (fwd.listen_port != 0) |
769 | goto exists; |
770 | debug2_f("found allocated port")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 770, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "found allocated port"); |
771 | if ((r = sshbuf_put_u32(reply, |
772 | MUX_S_REMOTE_PORT0x80000007)) != 0 || |
773 | (r = sshbuf_put_u32(reply, rid)) != 0 || |
774 | (r = sshbuf_put_u32(reply, |
775 | options.remote_forwards[i].allocated_port)) != 0) |
776 | fatal_fr(r, "reply FWD_REMOTE")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 776, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "reply FWD_REMOTE"); |
777 | goto out; |
778 | } |
779 | break; |
780 | } |
781 | |
782 | if (options.control_master == SSHCTL_MASTER_ASK3 || |
783 | options.control_master == SSHCTL_MASTER_AUTO_ASK4) { |
784 | if (!ask_permission("Open %s on %s?", fwd_desc, host)) { |
785 | debug2_f("forwarding refused by user")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 785, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "forwarding refused by user" ); |
786 | reply_error(reply, MUX_S_PERMISSION_DENIED0x80000002, rid, |
787 | "Permission denied"); |
788 | goto out; |
789 | } |
790 | } |
791 | |
792 | if (ftype == MUX_FWD_LOCAL1 || ftype == MUX_FWD_DYNAMIC3) { |
793 | if (!channel_setup_local_fwd_listener(ssh, &fwd, |
794 | &options.fwd_opts)) { |
795 | fail: |
796 | logit_f("requested %s failed", fwd_desc)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 796, 1, SYSLOG_LEVEL_INFO, ((void*)0), "requested %s failed", fwd_desc ); |
797 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, |
798 | "Port forwarding failed"); |
799 | goto out; |
800 | } |
801 | add_local_forward(&options, &fwd); |
802 | freefwd = 0; |
803 | } else { |
804 | struct mux_channel_confirm_ctx *fctx; |
805 | |
806 | fwd.handle = channel_request_remote_forwarding(ssh, &fwd); |
807 | if (fwd.handle < 0) |
808 | goto fail; |
809 | add_remote_forward(&options, &fwd); |
810 | fctx = xcalloc(1, sizeof(*fctx)); |
811 | fctx->cid = c->self; |
812 | fctx->rid = rid; |
813 | fctx->fid = options.num_remote_forwards - 1; |
814 | client_register_global_confirm(mux_confirm_remote_forward, |
815 | fctx); |
816 | freefwd = 0; |
817 | c->mux_pause = 1; /* wait for mux_confirm_remote_forward */ |
818 | /* delayed reply in mux_confirm_remote_forward */ |
819 | goto out; |
820 | } |
821 | reply_ok(reply, rid); |
822 | out: |
823 | free(fwd_desc); |
824 | if (freefwd) { |
825 | free(fwd.listen_host); |
826 | free(fwd.listen_path); |
827 | free(fwd.connect_host); |
828 | free(fwd.connect_path); |
829 | } |
830 | return ret; |
831 | } |
832 | |
833 | static int |
834 | mux_master_process_close_fwd(struct ssh *ssh, u_int rid, |
835 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
836 | { |
837 | struct Forward fwd, *found_fwd; |
838 | char *fwd_desc = NULL((void*)0); |
839 | const char *error_reason = NULL((void*)0); |
840 | char *listen_addr = NULL((void*)0), *connect_addr = NULL((void*)0); |
841 | u_int ftype; |
842 | int r, i, ret = 0; |
843 | u_int lport, cport; |
844 | |
845 | memset(&fwd, 0, sizeof(fwd)); |
846 | |
847 | if ((r = sshbuf_get_u32(m, &ftype)) != 0 || |
848 | (r = sshbuf_get_cstring(m, &listen_addr, NULL((void*)0))) != 0 || |
Although the value stored to 'r' is used in the enclosing expression, the value is never actually read from 'r' | |
849 | (r = sshbuf_get_u32(m, &lport)) != 0 || |
850 | (r = sshbuf_get_cstring(m, &connect_addr, NULL((void*)0))) != 0 || |
851 | (r = sshbuf_get_u32(m, &cport)) != 0 || |
852 | (lport != (u_int)PORT_STREAMLOCAL-2 && lport > 65535) || |
853 | (cport != (u_int)PORT_STREAMLOCAL-2 && cport > 65535)) { |
854 | error_f("malformed message")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 854, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "malformed message"); |
855 | ret = -1; |
856 | goto out; |
857 | } |
858 | |
859 | if (*listen_addr == '\0') { |
860 | free(listen_addr); |
861 | listen_addr = NULL((void*)0); |
862 | } |
863 | if (*connect_addr == '\0') { |
864 | free(connect_addr); |
865 | connect_addr = NULL((void*)0); |
866 | } |
867 | |
868 | memset(&fwd, 0, sizeof(fwd)); |
869 | fwd.listen_port = lport; |
870 | if (fwd.listen_port == PORT_STREAMLOCAL-2) |
871 | fwd.listen_path = listen_addr; |
872 | else |
873 | fwd.listen_host = listen_addr; |
874 | fwd.connect_port = cport; |
875 | if (fwd.connect_port == PORT_STREAMLOCAL-2) |
876 | fwd.connect_path = connect_addr; |
877 | else |
878 | fwd.connect_host = connect_addr; |
879 | |
880 | debug2_f("channel %d: request cancel %s", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 881, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel %d: request cancel %s" , c->self, (fwd_desc = format_forward(ftype, &fwd))) |
881 | (fwd_desc = format_forward(ftype, &fwd)))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 881, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel %d: request cancel %s" , c->self, (fwd_desc = format_forward(ftype, &fwd))); |
882 | |
883 | /* make sure this has been requested */ |
884 | found_fwd = NULL((void*)0); |
885 | switch (ftype) { |
886 | case MUX_FWD_LOCAL1: |
887 | case MUX_FWD_DYNAMIC3: |
888 | for (i = 0; i < options.num_local_forwards; i++) { |
889 | if (compare_forward(&fwd, |
890 | options.local_forwards + i)) { |
891 | found_fwd = options.local_forwards + i; |
892 | break; |
893 | } |
894 | } |
895 | break; |
896 | case MUX_FWD_REMOTE2: |
897 | for (i = 0; i < options.num_remote_forwards; i++) { |
898 | if (compare_forward(&fwd, |
899 | options.remote_forwards + i)) { |
900 | found_fwd = options.remote_forwards + i; |
901 | break; |
902 | } |
903 | } |
904 | break; |
905 | } |
906 | |
907 | if (found_fwd == NULL((void*)0)) |
908 | error_reason = "port not forwarded"; |
909 | else if (ftype == MUX_FWD_REMOTE2) { |
910 | /* |
911 | * This shouldn't fail unless we confused the host/port |
912 | * between options.remote_forwards and permitted_opens. |
913 | * However, for dynamic allocated listen ports we need |
914 | * to use the actual listen port. |
915 | */ |
916 | if (channel_request_rforward_cancel(ssh, found_fwd) == -1) |
917 | error_reason = "port not in permitted opens"; |
918 | } else { /* local and dynamic forwards */ |
919 | /* Ditto */ |
920 | if (channel_cancel_lport_listener(ssh, &fwd, fwd.connect_port, |
921 | &options.fwd_opts) == -1) |
922 | error_reason = "port not found"; |
923 | } |
924 | |
925 | if (error_reason != NULL((void*)0)) |
926 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, error_reason); |
927 | else { |
928 | reply_ok(reply, rid); |
929 | free(found_fwd->listen_host); |
930 | free(found_fwd->listen_path); |
931 | free(found_fwd->connect_host); |
932 | free(found_fwd->connect_path); |
933 | found_fwd->listen_host = found_fwd->connect_host = NULL((void*)0); |
934 | found_fwd->listen_path = found_fwd->connect_path = NULL((void*)0); |
935 | found_fwd->listen_port = found_fwd->connect_port = 0; |
936 | } |
937 | out: |
938 | free(fwd_desc); |
939 | free(listen_addr); |
940 | free(connect_addr); |
941 | |
942 | return ret; |
943 | } |
944 | |
945 | static int |
946 | mux_master_process_stdio_fwd(struct ssh *ssh, u_int rid, |
947 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
948 | { |
949 | Channel *nc; |
950 | char *chost = NULL((void*)0); |
951 | u_int cport, i, j; |
952 | int r, new_fd[2]; |
953 | struct mux_stdio_confirm_ctx *cctx; |
954 | |
955 | if ((r = sshbuf_skip_string(m)sshbuf_get_string_direct(m, ((void*)0), ((void*)0))) != 0 || /* reserved */ |
956 | (r = sshbuf_get_cstring(m, &chost, NULL((void*)0))) != 0 || |
957 | (r = sshbuf_get_u32(m, &cport)) != 0) { |
958 | free(chost); |
959 | error_f("malformed message")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 959, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "malformed message"); |
960 | return -1; |
961 | } |
962 | |
963 | debug2_f("channel %d: stdio fwd to %s:%u", c->self, chost, cport)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 963, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel %d: stdio fwd to %s:%u" , c->self, chost, cport); |
964 | |
965 | /* Gather fds from client */ |
966 | for(i = 0; i < 2; i++) { |
967 | if ((new_fd[i] = mm_receive_fd(c->sock)) == -1) { |
968 | error_f("failed to receive fd %d from client", i)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 968, 1, SYSLOG_LEVEL_ERROR, ((void*)0), "failed to receive fd %d from client" , i); |
969 | for (j = 0; j < i; j++) |
970 | close(new_fd[j]); |
971 | free(chost); |
972 | |
973 | /* prepare reply */ |
974 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, |
975 | "did not receive file descriptors"); |
976 | return -1; |
977 | } |
978 | } |
979 | |
980 | debug3_f("got fds stdin %d, stdout %d", new_fd[0], new_fd[1])sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 980, 1, SYSLOG_LEVEL_DEBUG3, ((void*)0), "got fds stdin %d, stdout %d" , new_fd[0], new_fd[1]); |
981 | |
982 | /* XXX support multiple child sessions in future */ |
983 | if (c->have_remote_id) { |
984 | debug2_f("session already open")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 984, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "session already open"); |
985 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, |
986 | "Multiple sessions not supported"); |
987 | cleanup: |
988 | close(new_fd[0]); |
989 | close(new_fd[1]); |
990 | free(chost); |
991 | return 0; |
992 | } |
993 | |
994 | if (options.control_master == SSHCTL_MASTER_ASK3 || |
995 | options.control_master == SSHCTL_MASTER_AUTO_ASK4) { |
996 | if (!ask_permission("Allow forward to %s:%u? ", |
997 | chost, cport)) { |
998 | debug2_f("stdio fwd refused by user")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 998, 1, SYSLOG_LEVEL_DEBUG2, ((void*)0), "stdio fwd refused by user" ); |
999 | reply_error(reply, MUX_S_PERMISSION_DENIED0x80000002, rid, |
1000 | "Permission denied"); |
1001 | goto cleanup; |
1002 | } |
1003 | } |
1004 | |
1005 | nc = channel_connect_stdio_fwd(ssh, chost, cport, new_fd[0], new_fd[1], |
1006 | CHANNEL_NONBLOCK_STDIO2); |
1007 | free(chost); |
1008 | |
1009 | nc->ctl_chan = c->self; /* link session -> control channel */ |
1010 | c->remote_id = nc->self; /* link control -> session channel */ |
1011 | c->have_remote_id = 1; |
1012 | |
1013 | debug2_f("channel_new: %d control %d", nc->self, nc->ctl_chan)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1013, 1 , SYSLOG_LEVEL_DEBUG2, ((void*)0), "channel_new: %d control %d" , nc->self, nc->ctl_chan); |
1014 | |
1015 | channel_register_cleanup(ssh, nc->self, |
1016 | mux_master_session_cleanup_cb, 1); |
1017 | |
1018 | cctx = xcalloc(1, sizeof(*cctx)); |
1019 | cctx->rid = rid; |
1020 | channel_register_open_confirm(ssh, nc->self, mux_stdio_confirm, cctx); |
1021 | c->mux_pause = 1; /* stop handling messages until open_confirm done */ |
1022 | |
1023 | /* reply is deferred, sent by mux_session_confirm */ |
1024 | return 0; |
1025 | } |
1026 | |
1027 | /* Callback on open confirmation in mux master for a mux stdio fwd session. */ |
1028 | static void |
1029 | mux_stdio_confirm(struct ssh *ssh, int id, int success, void *arg) |
1030 | { |
1031 | struct mux_stdio_confirm_ctx *cctx = arg; |
1032 | Channel *c, *cc; |
1033 | struct sshbuf *reply; |
1034 | int r; |
1035 | |
1036 | if (cctx == NULL((void*)0)) |
1037 | fatal_f("cctx == NULL")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1037, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "cctx == NULL"); |
1038 | if ((c = channel_by_id(ssh, id)) == NULL((void*)0)) |
1039 | fatal_f("no channel for id %d", id)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1039, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "no channel for id %d", id ); |
1040 | if ((cc = channel_by_id(ssh, c->ctl_chan)) == NULL((void*)0)) |
1041 | fatal_f("channel %d lacks control channel %d",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1042, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "channel %d lacks control channel %d" , id, c->ctl_chan) |
1042 | id, c->ctl_chan)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1042, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "channel %d lacks control channel %d" , id, c->ctl_chan); |
1043 | if ((reply = sshbuf_new()) == NULL((void*)0)) |
1044 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1044, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
1045 | |
1046 | if (!success) { |
1047 | debug3_f("sending failure reply")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1047, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "sending failure reply"); |
1048 | reply_error(reply, MUX_S_FAILURE0x80000003, cctx->rid, |
1049 | "Session open refused by peer"); |
1050 | /* prepare reply */ |
1051 | goto done; |
1052 | } |
1053 | |
1054 | debug3_f("sending success reply")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1054, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "sending success reply"); |
1055 | /* prepare reply */ |
1056 | if ((r = sshbuf_put_u32(reply, MUX_S_SESSION_OPENED0x80000006)) != 0 || |
1057 | (r = sshbuf_put_u32(reply, cctx->rid)) != 0 || |
1058 | (r = sshbuf_put_u32(reply, c->self)) != 0) |
1059 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1059, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
1060 | |
1061 | done: |
1062 | /* Send reply */ |
1063 | if ((r = sshbuf_put_stringb(cc->output, reply)) != 0) |
1064 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1064, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
1065 | sshbuf_free(reply); |
1066 | |
1067 | if (cc->mux_pause <= 0) |
1068 | fatal_f("mux_pause %d", cc->mux_pause)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1068, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "mux_pause %d", cc->mux_pause ); |
1069 | cc->mux_pause = 0; /* start processing messages again */ |
1070 | c->open_confirm_ctx = NULL((void*)0); |
1071 | free(cctx); |
1072 | } |
1073 | |
1074 | static int |
1075 | mux_master_process_stop_listening(struct ssh *ssh, u_int rid, |
1076 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
1077 | { |
1078 | debug_f("channel %d: stop listening", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1078, 1 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "channel %d: stop listening" , c->self); |
1079 | |
1080 | if (options.control_master == SSHCTL_MASTER_ASK3 || |
1081 | options.control_master == SSHCTL_MASTER_AUTO_ASK4) { |
1082 | if (!ask_permission("Disable further multiplexing on shared " |
1083 | "connection to %s? ", host)) { |
1084 | debug2_f("stop listen refused by user")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1084, 1 , SYSLOG_LEVEL_DEBUG2, ((void*)0), "stop listen refused by user" ); |
1085 | reply_error(reply, MUX_S_PERMISSION_DENIED0x80000002, rid, |
1086 | "Permission denied"); |
1087 | return 0; |
1088 | } |
1089 | } |
1090 | |
1091 | if (mux_listener_channel != NULL((void*)0)) { |
1092 | channel_free(ssh, mux_listener_channel); |
1093 | client_stop_mux(); |
1094 | free(options.control_path); |
1095 | options.control_path = NULL((void*)0); |
1096 | mux_listener_channel = NULL((void*)0); |
1097 | muxserver_sock = -1; |
1098 | } |
1099 | |
1100 | reply_ok(reply, rid); |
1101 | return 0; |
1102 | } |
1103 | |
1104 | static int |
1105 | mux_master_process_proxy(struct ssh *ssh, u_int rid, |
1106 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
1107 | { |
1108 | int r; |
1109 | |
1110 | debug_f("channel %d: proxy request", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1110, 1 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "channel %d: proxy request" , c->self); |
1111 | |
1112 | c->mux_rcb = channel_proxy_downstream; |
1113 | if ((r = sshbuf_put_u32(reply, MUX_S_PROXY0x8000000f)) != 0 || |
1114 | (r = sshbuf_put_u32(reply, rid)) != 0) |
1115 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1115, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
1116 | |
1117 | return 0; |
1118 | } |
1119 | |
1120 | /* Channel callbacks fired on read/write from mux client fd */ |
1121 | static int |
1122 | mux_master_read_cb(struct ssh *ssh, Channel *c) |
1123 | { |
1124 | struct mux_master_state *state = (struct mux_master_state *)c->mux_ctx; |
1125 | struct sshbuf *in = NULL((void*)0), *out = NULL((void*)0); |
1126 | u_int type, rid, i; |
1127 | int r, ret = -1; |
1128 | |
1129 | if ((out = sshbuf_new()) == NULL((void*)0)) |
1130 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1130, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
1131 | |
1132 | /* Setup ctx and */ |
1133 | if (c->mux_ctx == NULL((void*)0)) { |
1134 | state = xcalloc(1, sizeof(*state)); |
1135 | c->mux_ctx = state; |
1136 | channel_register_cleanup(ssh, c->self, |
1137 | mux_master_control_cleanup_cb, 0); |
1138 | |
1139 | /* Send hello */ |
1140 | if ((r = sshbuf_put_u32(out, MUX_MSG_HELLO0x00000001)) != 0 || |
1141 | (r = sshbuf_put_u32(out, SSHMUX_VER4)) != 0) |
1142 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1142, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
1143 | /* no extensions */ |
1144 | if ((r = sshbuf_put_stringb(c->output, out)) != 0) |
1145 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1145, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
1146 | debug3_f("channel %d: hello sent", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1146, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "channel %d: hello sent", c ->self); |
1147 | ret = 0; |
1148 | goto out; |
1149 | } |
1150 | |
1151 | /* Channel code ensures that we receive whole packets */ |
1152 | if ((r = sshbuf_froms(c->input, &in)) != 0) { |
1153 | malf: |
1154 | error_f("malformed message")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1154, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "malformed message"); |
1155 | goto out; |
1156 | } |
1157 | |
1158 | if ((r = sshbuf_get_u32(in, &type)) != 0) |
1159 | goto malf; |
1160 | debug3_f("channel %d packet type 0x%08x len %zu", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1161, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "channel %d packet type 0x%08x len %zu" , c->self, type, sshbuf_len(in)) |
1161 | type, sshbuf_len(in))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1161, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "channel %d packet type 0x%08x len %zu" , c->self, type, sshbuf_len(in)); |
1162 | |
1163 | if (type == MUX_MSG_HELLO0x00000001) |
1164 | rid = 0; |
1165 | else { |
1166 | if (!state->hello_rcvd) { |
1167 | error_f("expected MUX_MSG_HELLO(0x%08x), "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1168, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "expected MUX_MSG_HELLO(0x%08x), " "received 0x%08x", 0x00000001, type) |
1168 | "received 0x%08x", MUX_MSG_HELLO, type)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1168, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "expected MUX_MSG_HELLO(0x%08x), " "received 0x%08x", 0x00000001, type); |
1169 | goto out; |
1170 | } |
1171 | if ((r = sshbuf_get_u32(in, &rid)) != 0) |
1172 | goto malf; |
1173 | } |
1174 | |
1175 | for (i = 0; mux_master_handlers[i].handler != NULL((void*)0); i++) { |
1176 | if (type == mux_master_handlers[i].type) { |
1177 | ret = mux_master_handlers[i].handler(ssh, rid, |
1178 | c, in, out); |
1179 | break; |
1180 | } |
1181 | } |
1182 | if (mux_master_handlers[i].handler == NULL((void*)0)) { |
1183 | error_f("unsupported mux message 0x%08x", type)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1183, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "unsupported mux message 0x%08x" , type); |
1184 | reply_error(out, MUX_S_FAILURE0x80000003, rid, "unsupported request"); |
1185 | ret = 0; |
1186 | } |
1187 | /* Enqueue reply packet */ |
1188 | if (sshbuf_len(out) != 0 && |
1189 | (r = sshbuf_put_stringb(c->output, out)) != 0) |
1190 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1190, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
1191 | out: |
1192 | sshbuf_free(in); |
1193 | sshbuf_free(out); |
1194 | return ret; |
1195 | } |
1196 | |
1197 | void |
1198 | mux_exit_message(struct ssh *ssh, Channel *c, int exitval) |
1199 | { |
1200 | struct sshbuf *m; |
1201 | Channel *mux_chan; |
1202 | int r; |
1203 | |
1204 | debug3_f("channel %d: exit message, exitval %d", c->self, exitval)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1204, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "channel %d: exit message, exitval %d" , c->self, exitval); |
1205 | |
1206 | if ((mux_chan = channel_by_id(ssh, c->ctl_chan)) == NULL((void*)0)) |
1207 | fatal_f("channel %d missing mux %d", c->self, c->ctl_chan)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1207, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "channel %d missing mux %d" , c->self, c->ctl_chan); |
1208 | |
1209 | /* Append exit message packet to control socket output queue */ |
1210 | if ((m = sshbuf_new()) == NULL((void*)0)) |
1211 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1211, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
1212 | if ((r = sshbuf_put_u32(m, MUX_S_EXIT_MESSAGE0x80000004)) != 0 || |
1213 | (r = sshbuf_put_u32(m, c->self)) != 0 || |
1214 | (r = sshbuf_put_u32(m, exitval)) != 0 || |
1215 | (r = sshbuf_put_stringb(mux_chan->output, m)) != 0) |
1216 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1216, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
1217 | sshbuf_free(m); |
1218 | } |
1219 | |
1220 | void |
1221 | mux_tty_alloc_failed(struct ssh *ssh, Channel *c) |
1222 | { |
1223 | struct sshbuf *m; |
1224 | Channel *mux_chan; |
1225 | int r; |
1226 | |
1227 | debug3_f("channel %d: TTY alloc failed", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1227, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "channel %d: TTY alloc failed" , c->self); |
1228 | |
1229 | if ((mux_chan = channel_by_id(ssh, c->ctl_chan)) == NULL((void*)0)) |
1230 | fatal_f("channel %d missing mux %d", c->self, c->ctl_chan)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1230, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "channel %d missing mux %d" , c->self, c->ctl_chan); |
1231 | |
1232 | /* Append exit message packet to control socket output queue */ |
1233 | if ((m = sshbuf_new()) == NULL((void*)0)) |
1234 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1234, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
1235 | if ((r = sshbuf_put_u32(m, MUX_S_TTY_ALLOC_FAIL0x80000008)) != 0 || |
1236 | (r = sshbuf_put_u32(m, c->self)) != 0 || |
1237 | (r = sshbuf_put_stringb(mux_chan->output, m)) != 0) |
1238 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1238, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
1239 | sshbuf_free(m); |
1240 | } |
1241 | |
1242 | /* Prepare a mux master to listen on a Unix domain socket. */ |
1243 | void |
1244 | muxserver_listen(struct ssh *ssh) |
1245 | { |
1246 | mode_t old_umask; |
1247 | char *orig_control_path = options.control_path; |
1248 | char rbuf[16+1]; |
1249 | u_int i, r; |
1250 | int oerrno; |
1251 | |
1252 | if (options.control_path == NULL((void*)0) || |
1253 | options.control_master == SSHCTL_MASTER_NO0) |
1254 | return; |
1255 | |
1256 | debug("setting up multiplex master socket")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1256, 0 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "setting up multiplex master socket" ); |
1257 | |
1258 | /* |
1259 | * Use a temporary path before listen so we can pseudo-atomically |
1260 | * establish the listening socket in its final location to avoid |
1261 | * other processes racing in between bind() and listen() and hitting |
1262 | * an unready socket. |
1263 | */ |
1264 | for (i = 0; i < sizeof(rbuf) - 1; i++) { |
1265 | r = arc4random_uniform(26+26+10); |
1266 | rbuf[i] = (r < 26) ? 'a' + r : |
1267 | (r < 26*2) ? 'A' + r - 26 : |
1268 | '0' + r - 26 - 26; |
1269 | } |
1270 | rbuf[sizeof(rbuf) - 1] = '\0'; |
1271 | options.control_path = NULL((void*)0); |
1272 | xasprintf(&options.control_path, "%s.%s", orig_control_path, rbuf); |
1273 | debug3_f("temporary control path %s", options.control_path)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1273, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "temporary control path %s" , options.control_path); |
1274 | |
1275 | old_umask = umask(0177); |
1276 | muxserver_sock = unix_listener(options.control_path, 64, 0); |
1277 | oerrno = errno(*__errno()); |
1278 | umask(old_umask); |
1279 | if (muxserver_sock < 0) { |
1280 | if (oerrno == EINVAL22 || oerrno == EADDRINUSE48) { |
1281 | error("ControlSocket %s already exists, "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1282, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "ControlSocket %s already exists, " "disabling multiplexing", options.control_path) |
1282 | "disabling multiplexing", options.control_path)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1282, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "ControlSocket %s already exists, " "disabling multiplexing", options.control_path); |
1283 | disable_mux_master: |
1284 | if (muxserver_sock != -1) { |
1285 | close(muxserver_sock); |
1286 | muxserver_sock = -1; |
1287 | } |
1288 | free(orig_control_path); |
1289 | free(options.control_path); |
1290 | options.control_path = NULL((void*)0); |
1291 | options.control_master = SSHCTL_MASTER_NO0; |
1292 | return; |
1293 | } else { |
1294 | /* unix_listener() logs the error */ |
1295 | cleanup_exit(255); |
1296 | } |
1297 | } |
1298 | |
1299 | /* Now atomically "move" the mux socket into position */ |
1300 | if (link(options.control_path, orig_control_path) != 0) { |
1301 | if (errno(*__errno()) != EEXIST17) { |
1302 | fatal_f("link mux listener %s => %s: %s",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1304, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "link mux listener %s => %s: %s" , options.control_path, orig_control_path, strerror((*__errno ()))) |
1303 | options.control_path, orig_control_path,sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1304, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "link mux listener %s => %s: %s" , options.control_path, orig_control_path, strerror((*__errno ()))) |
1304 | strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1304, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "link mux listener %s => %s: %s" , options.control_path, orig_control_path, strerror((*__errno ()))); |
1305 | } |
1306 | error("ControlSocket %s already exists, disabling multiplexing",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1307, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "ControlSocket %s already exists, disabling multiplexing" , orig_control_path) |
1307 | orig_control_path)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1307, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "ControlSocket %s already exists, disabling multiplexing" , orig_control_path); |
1308 | unlink(options.control_path); |
1309 | goto disable_mux_master; |
1310 | } |
1311 | unlink(options.control_path); |
1312 | free(options.control_path); |
1313 | options.control_path = orig_control_path; |
1314 | |
1315 | set_nonblock(muxserver_sock); |
1316 | |
1317 | mux_listener_channel = channel_new(ssh, "mux listener", |
1318 | SSH_CHANNEL_MUX_LISTENER15, muxserver_sock, muxserver_sock, -1, |
1319 | CHAN_TCP_WINDOW_DEFAULT(64*(32*1024)), CHAN_TCP_PACKET_DEFAULT(32*1024), |
1320 | 0, options.control_path, 1); |
1321 | mux_listener_channel->mux_rcb = mux_master_read_cb; |
1322 | debug3_f("mux listener channel %d fd %d",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1323, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "mux listener channel %d fd %d" , mux_listener_channel->self, mux_listener_channel->sock ) |
1323 | mux_listener_channel->self, mux_listener_channel->sock)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1323, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "mux listener channel %d fd %d" , mux_listener_channel->self, mux_listener_channel->sock ); |
1324 | } |
1325 | |
1326 | /* Callback on open confirmation in mux master for a mux client session. */ |
1327 | static void |
1328 | mux_session_confirm(struct ssh *ssh, int id, int success, void *arg) |
1329 | { |
1330 | struct mux_session_confirm_ctx *cctx = arg; |
1331 | const char *display; |
1332 | Channel *c, *cc; |
1333 | int i, r; |
1334 | struct sshbuf *reply; |
1335 | |
1336 | if (cctx == NULL((void*)0)) |
1337 | fatal_f("cctx == NULL")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1337, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "cctx == NULL"); |
1338 | if ((c = channel_by_id(ssh, id)) == NULL((void*)0)) |
1339 | fatal_f("no channel for id %d", id)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1339, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "no channel for id %d", id ); |
1340 | if ((cc = channel_by_id(ssh, c->ctl_chan)) == NULL((void*)0)) |
1341 | fatal_f("channel %d lacks control channel %d",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1342, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "channel %d lacks control channel %d" , id, c->ctl_chan) |
1342 | id, c->ctl_chan)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1342, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "channel %d lacks control channel %d" , id, c->ctl_chan); |
1343 | if ((reply = sshbuf_new()) == NULL((void*)0)) |
1344 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1344, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
1345 | |
1346 | if (!success) { |
1347 | debug3_f("sending failure reply")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1347, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "sending failure reply"); |
1348 | reply_error(reply, MUX_S_FAILURE0x80000003, cctx->rid, |
1349 | "Session open refused by peer"); |
1350 | goto done; |
1351 | } |
1352 | |
1353 | display = getenv("DISPLAY"); |
1354 | if (cctx->want_x_fwd && options.forward_x11 && display != NULL((void*)0)) { |
1355 | char *proto, *data; |
1356 | |
1357 | /* Get reasonable local authentication information. */ |
1358 | if (client_x11_get_proto(ssh, display, options.xauth_location, |
1359 | options.forward_x11_trusted, options.forward_x11_timeout, |
1360 | &proto, &data) == 0) { |
1361 | /* Request forwarding with authentication spoofing. */ |
1362 | debug("Requesting X11 forwarding with authentication "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1363, 0 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "Requesting X11 forwarding with authentication " "spoofing.") |
1363 | "spoofing.")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1363, 0 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "Requesting X11 forwarding with authentication " "spoofing."); |
1364 | x11_request_forwarding_with_spoofing(ssh, id, |
1365 | display, proto, data, 1); |
1366 | /* XXX exit_on_forward_failure */ |
1367 | client_expect_confirm(ssh, id, "X11 forwarding", |
1368 | CONFIRM_WARN); |
1369 | } |
1370 | } |
1371 | |
1372 | if (cctx->want_agent_fwd && options.forward_agent) { |
1373 | debug("Requesting authentication agent forwarding.")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1373, 0 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "Requesting authentication agent forwarding." ); |
1374 | channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0); |
1375 | if ((r = sshpkt_send(ssh)) != 0) |
1376 | fatal_fr(r, "send")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1376, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send"); |
1377 | } |
1378 | |
1379 | client_session2_setup(ssh, id, cctx->want_tty, cctx->want_subsys, |
1380 | cctx->term, &cctx->tio, c->rfd, cctx->cmd, cctx->env); |
1381 | |
1382 | debug3_f("sending success reply")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1382, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "sending success reply"); |
1383 | /* prepare reply */ |
1384 | if ((r = sshbuf_put_u32(reply, MUX_S_SESSION_OPENED0x80000006)) != 0 || |
1385 | (r = sshbuf_put_u32(reply, cctx->rid)) != 0 || |
1386 | (r = sshbuf_put_u32(reply, c->self)) != 0) |
1387 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1387, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
1388 | |
1389 | done: |
1390 | /* Send reply */ |
1391 | if ((r = sshbuf_put_stringb(cc->output, reply)) != 0) |
1392 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1392, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
1393 | sshbuf_free(reply); |
1394 | |
1395 | if (cc->mux_pause <= 0) |
1396 | fatal_f("mux_pause %d", cc->mux_pause)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1396, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "mux_pause %d", cc->mux_pause ); |
1397 | cc->mux_pause = 0; /* start processing messages again */ |
1398 | c->open_confirm_ctx = NULL((void*)0); |
1399 | sshbuf_free(cctx->cmd); |
1400 | free(cctx->term); |
1401 | if (cctx->env != NULL((void*)0)) { |
1402 | for (i = 0; cctx->env[i] != NULL((void*)0); i++) |
1403 | free(cctx->env[i]); |
1404 | free(cctx->env); |
1405 | } |
1406 | free(cctx); |
1407 | } |
1408 | |
1409 | /* ** Multiplexing client support */ |
1410 | |
1411 | /* Exit signal handler */ |
1412 | static void |
1413 | control_client_sighandler(int signo) |
1414 | { |
1415 | muxclient_terminate = signo; |
1416 | } |
1417 | |
1418 | /* |
1419 | * Relay signal handler - used to pass some signals from mux client to |
1420 | * mux master. |
1421 | */ |
1422 | static void |
1423 | control_client_sigrelay(int signo) |
1424 | { |
1425 | int save_errno = errno(*__errno()); |
1426 | |
1427 | if (muxserver_pid > 1) |
1428 | kill(muxserver_pid, signo); |
1429 | |
1430 | errno(*__errno()) = save_errno; |
1431 | } |
1432 | |
1433 | static int |
1434 | mux_client_read(int fd, struct sshbuf *b, size_t need) |
1435 | { |
1436 | size_t have; |
1437 | ssize_t len; |
1438 | u_char *p; |
1439 | struct pollfd pfd; |
1440 | int r; |
1441 | |
1442 | pfd.fd = fd; |
1443 | pfd.events = POLLIN0x0001; |
1444 | if ((r = sshbuf_reserve(b, need, &p)) != 0) |
1445 | fatal_fr(r, "reserve")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1445, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reserve"); |
1446 | for (have = 0; have < need; ) { |
1447 | if (muxclient_terminate) { |
1448 | errno(*__errno()) = EINTR4; |
1449 | return -1; |
1450 | } |
1451 | len = read(fd, p + have, need - have); |
1452 | if (len == -1) { |
1453 | switch (errno(*__errno())) { |
1454 | case EAGAIN35: |
1455 | (void)poll(&pfd, 1, -1); |
1456 | /* FALLTHROUGH */ |
1457 | case EINTR4: |
1458 | continue; |
1459 | default: |
1460 | return -1; |
1461 | } |
1462 | } |
1463 | if (len == 0) { |
1464 | errno(*__errno()) = EPIPE32; |
1465 | return -1; |
1466 | } |
1467 | have += (size_t)len; |
1468 | } |
1469 | return 0; |
1470 | } |
1471 | |
1472 | static int |
1473 | mux_client_write_packet(int fd, struct sshbuf *m) |
1474 | { |
1475 | struct sshbuf *queue; |
1476 | u_int have, need; |
1477 | int r, oerrno, len; |
1478 | const u_char *ptr; |
1479 | struct pollfd pfd; |
1480 | |
1481 | pfd.fd = fd; |
1482 | pfd.events = POLLOUT0x0004; |
1483 | if ((queue = sshbuf_new()) == NULL((void*)0)) |
1484 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1484, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
1485 | if ((r = sshbuf_put_stringb(queue, m)) != 0) |
1486 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1486, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
1487 | |
1488 | need = sshbuf_len(queue); |
1489 | ptr = sshbuf_ptr(queue); |
1490 | |
1491 | for (have = 0; have < need; ) { |
1492 | if (muxclient_terminate) { |
1493 | sshbuf_free(queue); |
1494 | errno(*__errno()) = EINTR4; |
1495 | return -1; |
1496 | } |
1497 | len = write(fd, ptr + have, need - have); |
1498 | if (len == -1) { |
1499 | switch (errno(*__errno())) { |
1500 | case EAGAIN35: |
1501 | (void)poll(&pfd, 1, -1); |
1502 | /* FALLTHROUGH */ |
1503 | case EINTR4: |
1504 | continue; |
1505 | default: |
1506 | oerrno = errno(*__errno()); |
1507 | sshbuf_free(queue); |
1508 | errno(*__errno()) = oerrno; |
1509 | return -1; |
1510 | } |
1511 | } |
1512 | if (len == 0) { |
1513 | sshbuf_free(queue); |
1514 | errno(*__errno()) = EPIPE32; |
1515 | return -1; |
1516 | } |
1517 | have += (u_int)len; |
1518 | } |
1519 | sshbuf_free(queue); |
1520 | return 0; |
1521 | } |
1522 | |
1523 | static int |
1524 | mux_client_read_packet(int fd, struct sshbuf *m) |
1525 | { |
1526 | struct sshbuf *queue; |
1527 | size_t need, have; |
1528 | const u_char *ptr; |
1529 | int r, oerrno; |
1530 | |
1531 | if ((queue = sshbuf_new()) == NULL((void*)0)) |
1532 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1532, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
1533 | if (mux_client_read(fd, queue, 4) != 0) { |
1534 | if ((oerrno = errno(*__errno())) == EPIPE32) |
1535 | debug3_f("read header failed: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1536, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "read header failed: %s", strerror ((*__errno()))) |
1536 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1536, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "read header failed: %s", strerror ((*__errno()))); |
1537 | sshbuf_free(queue); |
1538 | errno(*__errno()) = oerrno; |
1539 | return -1; |
1540 | } |
1541 | need = PEEK_U32(sshbuf_ptr(queue))(((u_int32_t)(((const u_char *)(sshbuf_ptr(queue)))[0]) << 24) | ((u_int32_t)(((const u_char *)(sshbuf_ptr(queue)))[1]) << 16) | ((u_int32_t)(((const u_char *)(sshbuf_ptr(queue )))[2]) << 8) | (u_int32_t)(((const u_char *)(sshbuf_ptr (queue)))[3])); |
1542 | if (mux_client_read(fd, queue, need) != 0) { |
1543 | oerrno = errno(*__errno()); |
1544 | debug3_f("read body failed: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1544, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "read body failed: %s", strerror ((*__errno()))); |
1545 | sshbuf_free(queue); |
1546 | errno(*__errno()) = oerrno; |
1547 | return -1; |
1548 | } |
1549 | if ((r = sshbuf_get_string_direct(queue, &ptr, &have)) != 0 || |
1550 | (r = sshbuf_put(m, ptr, have)) != 0) |
1551 | fatal_fr(r, "dequeue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1551, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "dequeue"); |
1552 | sshbuf_free(queue); |
1553 | return 0; |
1554 | } |
1555 | |
1556 | static int |
1557 | mux_client_hello_exchange(int fd) |
1558 | { |
1559 | struct sshbuf *m; |
1560 | u_int type, ver; |
1561 | int r, ret = -1; |
1562 | |
1563 | if ((m = sshbuf_new()) == NULL((void*)0)) |
1564 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1564, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
1565 | if ((r = sshbuf_put_u32(m, MUX_MSG_HELLO0x00000001)) != 0 || |
1566 | (r = sshbuf_put_u32(m, SSHMUX_VER4)) != 0) |
1567 | fatal_fr(r, "assemble hello")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1567, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "assemble hello"); |
1568 | /* no extensions */ |
1569 | |
1570 | if (mux_client_write_packet(fd, m) != 0) { |
1571 | debug_f("write packet: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1571, 1 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "write packet: %s", strerror ((*__errno()))); |
1572 | goto out; |
1573 | } |
1574 | |
1575 | sshbuf_reset(m); |
1576 | |
1577 | /* Read their HELLO */ |
1578 | if (mux_client_read_packet(fd, m) != 0) { |
1579 | debug_f("read packet failed")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1579, 1 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "read packet failed"); |
1580 | goto out; |
1581 | } |
1582 | |
1583 | if ((r = sshbuf_get_u32(m, &type)) != 0) |
1584 | fatal_fr(r, "parse type")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1584, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse type"); |
1585 | if (type != MUX_MSG_HELLO0x00000001) { |
1586 | error_f("expected HELLO (%u) got %u", MUX_MSG_HELLO, type)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1586, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "expected HELLO (%u) got %u" , 0x00000001, type); |
1587 | goto out; |
1588 | } |
1589 | if ((r = sshbuf_get_u32(m, &ver)) != 0) |
1590 | fatal_fr(r, "parse version")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1590, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse version"); |
1591 | if (ver != SSHMUX_VER4) { |
1592 | error("Unsupported multiplexing protocol version %d "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1593, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "Unsupported multiplexing protocol version %d " "(expected %d)", ver, 4) |
1593 | "(expected %d)", ver, SSHMUX_VER)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1593, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "Unsupported multiplexing protocol version %d " "(expected %d)", ver, 4); |
1594 | goto out; |
1595 | } |
1596 | debug2_f("master version %u", ver)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1596, 1 , SYSLOG_LEVEL_DEBUG2, ((void*)0), "master version %u", ver); |
1597 | /* No extensions are presently defined */ |
1598 | while (sshbuf_len(m) > 0) { |
1599 | char *name = NULL((void*)0); |
1600 | |
1601 | if ((r = sshbuf_get_cstring(m, &name, NULL((void*)0))) != 0 || |
1602 | (r = sshbuf_skip_string(m)sshbuf_get_string_direct(m, ((void*)0), ((void*)0))) != 0) { /* value */ |
1603 | error_fr(r, "parse extension")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1603, 1 , SYSLOG_LEVEL_ERROR, ssh_err(r), "parse extension"); |
1604 | goto out; |
1605 | } |
1606 | debug2("Unrecognised master extension \"%s\"", name)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1606, 0 , SYSLOG_LEVEL_DEBUG2, ((void*)0), "Unrecognised master extension \"%s\"" , name); |
1607 | free(name); |
1608 | } |
1609 | /* success */ |
1610 | ret = 0; |
1611 | out: |
1612 | sshbuf_free(m); |
1613 | return ret; |
1614 | } |
1615 | |
1616 | static u_int |
1617 | mux_client_request_alive(int fd) |
1618 | { |
1619 | struct sshbuf *m; |
1620 | char *e; |
1621 | u_int pid, type, rid; |
1622 | int r; |
1623 | |
1624 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1624, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering"); |
1625 | |
1626 | if ((m = sshbuf_new()) == NULL((void*)0)) |
1627 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1627, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
1628 | if ((r = sshbuf_put_u32(m, MUX_C_ALIVE_CHECK0x10000004)) != 0 || |
1629 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0) |
1630 | fatal_fr(r, "assemble")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1630, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "assemble"); |
1631 | |
1632 | if (mux_client_write_packet(fd, m) != 0) |
1633 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1633, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "write packet: %s", strerror ((*__errno()))); |
1634 | |
1635 | sshbuf_reset(m); |
1636 | |
1637 | /* Read their reply */ |
1638 | if (mux_client_read_packet(fd, m) != 0) { |
1639 | sshbuf_free(m); |
1640 | return 0; |
1641 | } |
1642 | |
1643 | if ((r = sshbuf_get_u32(m, &type)) != 0) |
1644 | fatal_fr(r, "parse type")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1644, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse type"); |
1645 | if (type != MUX_S_ALIVE0x80000005) { |
1646 | if ((r = sshbuf_get_cstring(m, &e, NULL((void*)0))) != 0) |
1647 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1647, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
1648 | fatal_f("master returned error: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1648, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "master returned error: %s" , e); |
1649 | } |
1650 | |
1651 | if ((r = sshbuf_get_u32(m, &rid)) != 0) |
1652 | fatal_fr(r, "parse remote ID")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1652, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse remote ID"); |
1653 | if (rid != muxclient_request_id) |
1654 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1655, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
1655 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1655, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
1656 | if ((r = sshbuf_get_u32(m, &pid)) != 0) |
1657 | fatal_fr(r, "parse PID")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1657, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse PID"); |
1658 | sshbuf_free(m); |
1659 | |
1660 | debug3_f("done pid = %u", pid)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1660, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "done pid = %u", pid); |
1661 | |
1662 | muxclient_request_id++; |
1663 | |
1664 | return pid; |
1665 | } |
1666 | |
1667 | static void |
1668 | mux_client_request_terminate(int fd) |
1669 | { |
1670 | struct sshbuf *m; |
1671 | char *e; |
1672 | u_int type, rid; |
1673 | int r; |
1674 | |
1675 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1675, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering"); |
1676 | |
1677 | if ((m = sshbuf_new()) == NULL((void*)0)) |
1678 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1678, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
1679 | if ((r = sshbuf_put_u32(m, MUX_C_TERMINATE0x10000005)) != 0 || |
1680 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0) |
1681 | fatal_fr(r, "request")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1681, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request"); |
1682 | |
1683 | if (mux_client_write_packet(fd, m) != 0) |
1684 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1684, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "write packet: %s", strerror ((*__errno()))); |
1685 | |
1686 | sshbuf_reset(m); |
1687 | |
1688 | /* Read their reply */ |
1689 | if (mux_client_read_packet(fd, m) != 0) { |
1690 | /* Remote end exited already */ |
1691 | if (errno(*__errno()) == EPIPE32) { |
1692 | sshbuf_free(m); |
1693 | return; |
1694 | } |
1695 | fatal_f("read from master failed: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1695, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "read from master failed: %s" , strerror((*__errno()))); |
1696 | } |
1697 | |
1698 | if ((r = sshbuf_get_u32(m, &type)) != 0 || |
1699 | (r = sshbuf_get_u32(m, &rid)) != 0) |
1700 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1700, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
1701 | if (rid != muxclient_request_id) |
1702 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1703, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
1703 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1703, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
1704 | switch (type) { |
1705 | case MUX_S_OK0x80000001: |
1706 | break; |
1707 | case MUX_S_PERMISSION_DENIED0x80000002: |
1708 | if ((r = sshbuf_get_cstring(m, &e, NULL((void*)0))) != 0) |
1709 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1709, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
1710 | fatal("Master refused termination request: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1710, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Master refused termination request: %s" , e); |
1711 | case MUX_S_FAILURE0x80000003: |
1712 | if ((r = sshbuf_get_cstring(m, &e, NULL((void*)0))) != 0) |
1713 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1713, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
1714 | fatal_f("termination request failed: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1714, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "termination request failed: %s" , e); |
1715 | default: |
1716 | fatal_f("unexpected response from master 0x%08x", type)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1716, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "unexpected response from master 0x%08x" , type); |
1717 | } |
1718 | sshbuf_free(m); |
1719 | muxclient_request_id++; |
1720 | } |
1721 | |
1722 | static int |
1723 | mux_client_forward(int fd, int cancel_flag, u_int ftype, struct Forward *fwd) |
1724 | { |
1725 | struct sshbuf *m; |
1726 | char *e, *fwd_desc; |
1727 | const char *lhost, *chost; |
1728 | u_int type, rid; |
1729 | int r; |
1730 | |
1731 | fwd_desc = format_forward(ftype, fwd); |
1732 | debug("Requesting %s %s",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1733, 0 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "Requesting %s %s", cancel_flag ? "cancellation of" : "forwarding of", fwd_desc) |
1733 | cancel_flag ? "cancellation of" : "forwarding of", fwd_desc)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1733, 0 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "Requesting %s %s", cancel_flag ? "cancellation of" : "forwarding of", fwd_desc); |
1734 | free(fwd_desc); |
1735 | |
1736 | type = cancel_flag ? MUX_C_CLOSE_FWD0x10000007 : MUX_C_OPEN_FWD0x10000006; |
1737 | if (fwd->listen_path != NULL((void*)0)) |
1738 | lhost = fwd->listen_path; |
1739 | else if (fwd->listen_host == NULL((void*)0)) |
1740 | lhost = ""; |
1741 | else if (*fwd->listen_host == '\0') |
1742 | lhost = "*"; |
1743 | else |
1744 | lhost = fwd->listen_host; |
1745 | |
1746 | if (fwd->connect_path != NULL((void*)0)) |
1747 | chost = fwd->connect_path; |
1748 | else if (fwd->connect_host == NULL((void*)0)) |
1749 | chost = ""; |
1750 | else |
1751 | chost = fwd->connect_host; |
1752 | |
1753 | if ((m = sshbuf_new()) == NULL((void*)0)) |
1754 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1754, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
1755 | if ((r = sshbuf_put_u32(m, type)) != 0 || |
1756 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0 || |
1757 | (r = sshbuf_put_u32(m, ftype)) != 0 || |
1758 | (r = sshbuf_put_cstring(m, lhost)) != 0 || |
1759 | (r = sshbuf_put_u32(m, fwd->listen_port)) != 0 || |
1760 | (r = sshbuf_put_cstring(m, chost)) != 0 || |
1761 | (r = sshbuf_put_u32(m, fwd->connect_port)) != 0) |
1762 | fatal_fr(r, "request")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1762, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request"); |
1763 | |
1764 | if (mux_client_write_packet(fd, m) != 0) |
1765 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1765, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "write packet: %s", strerror ((*__errno()))); |
1766 | |
1767 | sshbuf_reset(m); |
1768 | |
1769 | /* Read their reply */ |
1770 | if (mux_client_read_packet(fd, m) != 0) { |
1771 | sshbuf_free(m); |
1772 | return -1; |
1773 | } |
1774 | |
1775 | if ((r = sshbuf_get_u32(m, &type)) != 0 || |
1776 | (r = sshbuf_get_u32(m, &rid)) != 0) |
1777 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1777, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
1778 | if (rid != muxclient_request_id) |
1779 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1780, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
1780 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1780, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
1781 | |
1782 | switch (type) { |
1783 | case MUX_S_OK0x80000001: |
1784 | break; |
1785 | case MUX_S_REMOTE_PORT0x80000007: |
1786 | if (cancel_flag) |
1787 | fatal_f("got MUX_S_REMOTE_PORT for cancel")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1787, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "got MUX_S_REMOTE_PORT for cancel" ); |
1788 | if ((r = sshbuf_get_u32(m, &fwd->allocated_port)) != 0) |
1789 | fatal_fr(r, "parse port")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1789, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse port"); |
1790 | verbose("Allocated port %u for remote forward to %s:%d",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1793, 0 , SYSLOG_LEVEL_VERBOSE, ((void*)0), "Allocated port %u for remote forward to %s:%d" , fwd->allocated_port, fwd->connect_host ? fwd->connect_host : "", fwd->connect_port) |
1791 | fwd->allocated_port,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1793, 0 , SYSLOG_LEVEL_VERBOSE, ((void*)0), "Allocated port %u for remote forward to %s:%d" , fwd->allocated_port, fwd->connect_host ? fwd->connect_host : "", fwd->connect_port) |
1792 | fwd->connect_host ? fwd->connect_host : "",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1793, 0 , SYSLOG_LEVEL_VERBOSE, ((void*)0), "Allocated port %u for remote forward to %s:%d" , fwd->allocated_port, fwd->connect_host ? fwd->connect_host : "", fwd->connect_port) |
1793 | fwd->connect_port)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1793, 0 , SYSLOG_LEVEL_VERBOSE, ((void*)0), "Allocated port %u for remote forward to %s:%d" , fwd->allocated_port, fwd->connect_host ? fwd->connect_host : "", fwd->connect_port); |
1794 | if (muxclient_command == SSHMUX_COMMAND_FORWARD5) |
1795 | fprintf(stdout(&__sF[1]), "%i\n", fwd->allocated_port); |
1796 | break; |
1797 | case MUX_S_PERMISSION_DENIED0x80000002: |
1798 | if ((r = sshbuf_get_cstring(m, &e, NULL((void*)0))) != 0) |
1799 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1799, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
1800 | sshbuf_free(m); |
1801 | error("Master refused forwarding request: %s", e)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1801, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "Master refused forwarding request: %s" , e); |
1802 | return -1; |
1803 | case MUX_S_FAILURE0x80000003: |
1804 | if ((r = sshbuf_get_cstring(m, &e, NULL((void*)0))) != 0) |
1805 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1805, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
1806 | sshbuf_free(m); |
1807 | error_f("forwarding request failed: %s", e)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1807, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "forwarding request failed: %s" , e); |
1808 | return -1; |
1809 | default: |
1810 | fatal_f("unexpected response from master 0x%08x", type)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1810, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "unexpected response from master 0x%08x" , type); |
1811 | } |
1812 | sshbuf_free(m); |
1813 | |
1814 | muxclient_request_id++; |
1815 | return 0; |
1816 | } |
1817 | |
1818 | static int |
1819 | mux_client_forwards(int fd, int cancel_flag) |
1820 | { |
1821 | int i, ret = 0; |
1822 | |
1823 | debug3_f("%s forwardings: %d local, %d remote",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1825, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "%s forwardings: %d local, %d remote" , cancel_flag ? "cancel" : "request", options.num_local_forwards , options.num_remote_forwards) |
1824 | cancel_flag ? "cancel" : "request",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1825, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "%s forwardings: %d local, %d remote" , cancel_flag ? "cancel" : "request", options.num_local_forwards , options.num_remote_forwards) |
1825 | options.num_local_forwards, options.num_remote_forwards)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1825, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "%s forwardings: %d local, %d remote" , cancel_flag ? "cancel" : "request", options.num_local_forwards , options.num_remote_forwards); |
1826 | |
1827 | /* XXX ExitOnForwardingFailure */ |
1828 | for (i = 0; i < options.num_local_forwards; i++) { |
1829 | if (mux_client_forward(fd, cancel_flag, |
1830 | options.local_forwards[i].connect_port == 0 ? |
1831 | MUX_FWD_DYNAMIC3 : MUX_FWD_LOCAL1, |
1832 | options.local_forwards + i) != 0) |
1833 | ret = -1; |
1834 | } |
1835 | for (i = 0; i < options.num_remote_forwards; i++) { |
1836 | if (mux_client_forward(fd, cancel_flag, MUX_FWD_REMOTE2, |
1837 | options.remote_forwards + i) != 0) |
1838 | ret = -1; |
1839 | } |
1840 | return ret; |
1841 | } |
1842 | |
1843 | static int |
1844 | mux_client_request_session(int fd) |
1845 | { |
1846 | struct sshbuf *m; |
1847 | char *e; |
1848 | const char *term = NULL((void*)0); |
1849 | u_int echar, rid, sid, esid, exitval, type, exitval_seen; |
1850 | extern char **environ; |
1851 | int r, i, rawmode; |
1852 | |
1853 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1853, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering"); |
1854 | |
1855 | if ((muxserver_pid = mux_client_request_alive(fd)) == 0) { |
1856 | error_f("master alive request failed")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1856, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "master alive request failed" ); |
1857 | return -1; |
1858 | } |
1859 | |
1860 | ssh_signal(SIGPIPE13, SIG_IGN(void (*)(int))1); |
1861 | |
1862 | if (options.stdin_null && stdfd_devnull(1, 0, 0) == -1) |
1863 | fatal_f("stdfd_devnull failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1863, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "stdfd_devnull failed"); |
1864 | |
1865 | if ((term = lookup_env_in_list("TERM", options.setenv, |
1866 | options.num_setenv)) == NULL((void*)0) || *term == '\0') |
1867 | term = getenv("TERM"); |
1868 | |
1869 | echar = 0xffffffff; |
1870 | if (options.escape_char != SSH_ESCAPECHAR_NONE-2) |
1871 | echar = (u_int)options.escape_char; |
1872 | |
1873 | if ((m = sshbuf_new()) == NULL((void*)0)) |
1874 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1874, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
1875 | if ((r = sshbuf_put_u32(m, MUX_C_NEW_SESSION0x10000002)) != 0 || |
1876 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0 || |
1877 | (r = sshbuf_put_string(m, NULL((void*)0), 0)) != 0 || /* reserved */ |
1878 | (r = sshbuf_put_u32(m, tty_flag)) != 0 || |
1879 | (r = sshbuf_put_u32(m, options.forward_x11)) != 0 || |
1880 | (r = sshbuf_put_u32(m, options.forward_agent)) != 0 || |
1881 | (r = sshbuf_put_u32(m, options.session_type == SESSION_TYPE_SUBSYSTEM1)) != 0 || |
1882 | (r = sshbuf_put_u32(m, echar)) != 0 || |
1883 | (r = sshbuf_put_cstring(m, term == NULL((void*)0) ? "" : term)) != 0 || |
1884 | (r = sshbuf_put_stringb(m, command)) != 0) |
1885 | fatal_fr(r, "request")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1885, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request"); |
1886 | |
1887 | /* Pass environment */ |
1888 | if (options.num_send_env > 0 && environ != NULL((void*)0)) { |
1889 | for (i = 0; environ[i] != NULL((void*)0); i++) { |
1890 | if (!env_permitted(environ[i])) |
1891 | continue; |
1892 | if ((r = sshbuf_put_cstring(m, environ[i])) != 0) |
1893 | fatal_fr(r, "request sendenv")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1893, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request sendenv"); |
1894 | } |
1895 | } |
1896 | for (i = 0; i < options.num_setenv; i++) { |
1897 | if ((r = sshbuf_put_cstring(m, options.setenv[i])) != 0) |
1898 | fatal_fr(r, "request setenv")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1898, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request setenv"); |
1899 | } |
1900 | |
1901 | if (mux_client_write_packet(fd, m) != 0) |
1902 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1902, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "write packet: %s", strerror ((*__errno()))); |
1903 | |
1904 | /* Send the stdio file descriptors */ |
1905 | if (mm_send_fd(fd, STDIN_FILENO0) == -1 || |
1906 | mm_send_fd(fd, STDOUT_FILENO1) == -1 || |
1907 | mm_send_fd(fd, STDERR_FILENO2) == -1) |
1908 | fatal_f("send fds failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1908, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "send fds failed"); |
1909 | |
1910 | debug3_f("session request sent")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1910, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "session request sent"); |
1911 | |
1912 | /* Read their reply */ |
1913 | sshbuf_reset(m); |
1914 | if (mux_client_read_packet(fd, m) != 0) { |
1915 | error_f("read from master failed: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1915, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "read from master failed: %s" , strerror((*__errno()))); |
1916 | sshbuf_free(m); |
1917 | return -1; |
1918 | } |
1919 | |
1920 | if ((r = sshbuf_get_u32(m, &type)) != 0 || |
1921 | (r = sshbuf_get_u32(m, &rid)) != 0) |
1922 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1922, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
1923 | if (rid != muxclient_request_id) |
1924 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1925, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
1925 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1925, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
1926 | |
1927 | switch (type) { |
1928 | case MUX_S_SESSION_OPENED0x80000006: |
1929 | if ((r = sshbuf_get_u32(m, &sid)) != 0) |
1930 | fatal_fr(r, "parse session ID")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1930, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse session ID"); |
1931 | debug_f("master session id: %u", sid)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1931, 1 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "master session id: %u", sid ); |
1932 | break; |
1933 | case MUX_S_PERMISSION_DENIED0x80000002: |
1934 | if ((r = sshbuf_get_cstring(m, &e, NULL((void*)0))) != 0) |
1935 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1935, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
1936 | error("Master refused session request: %s", e)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1936, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "Master refused session request: %s" , e); |
1937 | sshbuf_free(m); |
1938 | return -1; |
1939 | case MUX_S_FAILURE0x80000003: |
1940 | if ((r = sshbuf_get_cstring(m, &e, NULL((void*)0))) != 0) |
1941 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1941, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
1942 | error_f("session request failed: %s", e)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1942, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "session request failed: %s" , e); |
1943 | sshbuf_free(m); |
1944 | return -1; |
1945 | default: |
1946 | sshbuf_free(m); |
1947 | error_f("unexpected response from master 0x%08x", type)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1947, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "unexpected response from master 0x%08x" , type); |
1948 | return -1; |
1949 | } |
1950 | muxclient_request_id++; |
1951 | |
1952 | if (pledge("stdio proc tty", NULL((void*)0)) == -1) |
1953 | fatal_f("pledge(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1953, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "pledge(): %s", strerror( (*__errno()))); |
1954 | |
1955 | ssh_signal(SIGHUP1, control_client_sighandler); |
1956 | ssh_signal(SIGINT2, control_client_sighandler); |
1957 | ssh_signal(SIGTERM15, control_client_sighandler); |
1958 | ssh_signal(SIGWINCH28, control_client_sigrelay); |
1959 | |
1960 | rawmode = tty_flag; |
1961 | if (tty_flag) |
1962 | enter_raw_mode(options.request_tty == REQUEST_TTY_FORCE3); |
1963 | |
1964 | /* |
1965 | * Stick around until the controlee closes the client_fd. |
1966 | * Before it does, it is expected to write an exit message. |
1967 | * This process must read the value and wait for the closure of |
1968 | * the client_fd; if this one closes early, the multiplex master will |
1969 | * terminate early too (possibly losing data). |
1970 | */ |
1971 | for (exitval = 255, exitval_seen = 0;;) { |
1972 | sshbuf_reset(m); |
1973 | if (mux_client_read_packet(fd, m) != 0) |
1974 | break; |
1975 | if ((r = sshbuf_get_u32(m, &type)) != 0) |
1976 | fatal_fr(r, "parse type")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1976, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse type"); |
1977 | switch (type) { |
1978 | case MUX_S_TTY_ALLOC_FAIL0x80000008: |
1979 | if ((r = sshbuf_get_u32(m, &esid)) != 0) |
1980 | fatal_fr(r, "parse session ID")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1980, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse session ID"); |
1981 | if (esid != sid) |
1982 | fatal_f("tty alloc fail on unknown session: "sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1983, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "tty alloc fail on unknown session: " "my id %u theirs %u", sid, esid) |
1983 | "my id %u theirs %u", sid, esid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1983, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "tty alloc fail on unknown session: " "my id %u theirs %u", sid, esid); |
1984 | leave_raw_mode(options.request_tty == |
1985 | REQUEST_TTY_FORCE3); |
1986 | rawmode = 0; |
1987 | continue; |
1988 | case MUX_S_EXIT_MESSAGE0x80000004: |
1989 | if ((r = sshbuf_get_u32(m, &esid)) != 0) |
1990 | fatal_fr(r, "parse session ID")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1990, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse session ID"); |
1991 | if (esid != sid) |
1992 | fatal_f("exit on unknown session: "sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1993, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "exit on unknown session: " "my id %u theirs %u", sid, esid) |
1993 | "my id %u theirs %u", sid, esid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1993, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "exit on unknown session: " "my id %u theirs %u", sid, esid); |
1994 | if (exitval_seen) |
1995 | fatal_f("exitval sent twice")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1995, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "exitval sent twice"); |
1996 | if ((r = sshbuf_get_u32(m, &exitval)) != 0) |
1997 | fatal_fr(r, "parse exitval")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1997, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse exitval"); |
1998 | exitval_seen = 1; |
1999 | continue; |
2000 | default: |
2001 | if ((r = sshbuf_get_cstring(m, &e, NULL((void*)0))) != 0) |
2002 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2002, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
2003 | fatal_f("master returned error: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2003, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "master returned error: %s" , e); |
2004 | } |
2005 | } |
2006 | |
2007 | close(fd); |
2008 | if (rawmode) |
2009 | leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE3); |
2010 | |
2011 | if (muxclient_terminate) { |
2012 | debug2("Exiting on signal: %s", strsignal(muxclient_terminate))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2012, 0 , SYSLOG_LEVEL_DEBUG2, ((void*)0), "Exiting on signal: %s", strsignal (muxclient_terminate)); |
2013 | exitval = 255; |
2014 | } else if (!exitval_seen) { |
2015 | debug2("Control master terminated unexpectedly")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2015, 0 , SYSLOG_LEVEL_DEBUG2, ((void*)0), "Control master terminated unexpectedly" ); |
2016 | exitval = 255; |
2017 | } else |
2018 | debug2("Received exit status from master %d", exitval)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2018, 0 , SYSLOG_LEVEL_DEBUG2, ((void*)0), "Received exit status from master %d" , exitval); |
2019 | |
2020 | if (tty_flag && options.log_level >= SYSLOG_LEVEL_INFO) |
2021 | fprintf(stderr(&__sF[2]), "Shared connection to %s closed.\r\n", host); |
2022 | |
2023 | exit(exitval); |
2024 | } |
2025 | |
2026 | static int |
2027 | mux_client_proxy(int fd) |
2028 | { |
2029 | struct sshbuf *m; |
2030 | char *e; |
2031 | u_int type, rid; |
2032 | int r; |
2033 | |
2034 | if ((m = sshbuf_new()) == NULL((void*)0)) |
2035 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2035, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
2036 | if ((r = sshbuf_put_u32(m, MUX_C_PROXY0x1000000f)) != 0 || |
2037 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0) |
2038 | fatal_fr(r, "request")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2038, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request"); |
2039 | if (mux_client_write_packet(fd, m) != 0) |
2040 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2040, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "write packet: %s", strerror ((*__errno()))); |
2041 | |
2042 | sshbuf_reset(m); |
2043 | |
2044 | /* Read their reply */ |
2045 | if (mux_client_read_packet(fd, m) != 0) { |
2046 | sshbuf_free(m); |
2047 | return 0; |
2048 | } |
2049 | if ((r = sshbuf_get_u32(m, &type)) != 0 || |
2050 | (r = sshbuf_get_u32(m, &rid)) != 0) |
2051 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2051, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
2052 | if (rid != muxclient_request_id) |
2053 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2054, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
2054 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2054, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
2055 | if (type != MUX_S_PROXY0x8000000f) { |
2056 | if ((r = sshbuf_get_cstring(m, &e, NULL((void*)0))) != 0) |
2057 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2057, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
2058 | fatal_f("master returned error: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2058, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "master returned error: %s" , e); |
2059 | } |
2060 | sshbuf_free(m); |
2061 | |
2062 | debug3_f("done")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2062, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "done"); |
2063 | muxclient_request_id++; |
2064 | return 0; |
2065 | } |
2066 | |
2067 | static int |
2068 | mux_client_request_stdio_fwd(int fd) |
2069 | { |
2070 | struct sshbuf *m; |
2071 | char *e; |
2072 | u_int type, rid, sid; |
2073 | int r; |
2074 | |
2075 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2075, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering"); |
2076 | |
2077 | if ((muxserver_pid = mux_client_request_alive(fd)) == 0) { |
2078 | error_f("master alive request failed")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2078, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "master alive request failed" ); |
2079 | return -1; |
2080 | } |
2081 | |
2082 | ssh_signal(SIGPIPE13, SIG_IGN(void (*)(int))1); |
2083 | |
2084 | if (options.stdin_null && stdfd_devnull(1, 0, 0) == -1) |
2085 | fatal_f("stdfd_devnull failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2085, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "stdfd_devnull failed"); |
2086 | |
2087 | if ((m = sshbuf_new()) == NULL((void*)0)) |
2088 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2088, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
2089 | if ((r = sshbuf_put_u32(m, MUX_C_NEW_STDIO_FWD0x10000008)) != 0 || |
2090 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0 || |
2091 | (r = sshbuf_put_string(m, NULL((void*)0), 0)) != 0 || /* reserved */ |
2092 | (r = sshbuf_put_cstring(m, options.stdio_forward_host)) != 0 || |
2093 | (r = sshbuf_put_u32(m, options.stdio_forward_port)) != 0) |
2094 | fatal_fr(r, "request")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2094, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request"); |
2095 | |
2096 | if (mux_client_write_packet(fd, m) != 0) |
2097 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2097, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "write packet: %s", strerror ((*__errno()))); |
2098 | |
2099 | /* Send the stdio file descriptors */ |
2100 | if (mm_send_fd(fd, STDIN_FILENO0) == -1 || |
2101 | mm_send_fd(fd, STDOUT_FILENO1) == -1) |
2102 | fatal_f("send fds failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2102, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "send fds failed"); |
2103 | |
2104 | if (pledge("stdio proc tty", NULL((void*)0)) == -1) |
2105 | fatal_f("pledge(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2105, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "pledge(): %s", strerror( (*__errno()))); |
2106 | |
2107 | debug3_f("stdio forward request sent")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2107, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "stdio forward request sent" ); |
2108 | |
2109 | /* Read their reply */ |
2110 | sshbuf_reset(m); |
2111 | |
2112 | if (mux_client_read_packet(fd, m) != 0) { |
2113 | error_f("read from master failed: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2113, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "read from master failed: %s" , strerror((*__errno()))); |
2114 | sshbuf_free(m); |
2115 | return -1; |
2116 | } |
2117 | |
2118 | if ((r = sshbuf_get_u32(m, &type)) != 0 || |
2119 | (r = sshbuf_get_u32(m, &rid)) != 0) |
2120 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2120, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
2121 | if (rid != muxclient_request_id) |
2122 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2123, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
2123 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2123, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
2124 | switch (type) { |
2125 | case MUX_S_SESSION_OPENED0x80000006: |
2126 | if ((r = sshbuf_get_u32(m, &sid)) != 0) |
2127 | fatal_fr(r, "parse session ID")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2127, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse session ID"); |
2128 | debug_f("master session id: %u", sid)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2128, 1 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "master session id: %u", sid ); |
2129 | break; |
2130 | case MUX_S_PERMISSION_DENIED0x80000002: |
2131 | if ((r = sshbuf_get_cstring(m, &e, NULL((void*)0))) != 0) |
2132 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2132, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
2133 | sshbuf_free(m); |
2134 | fatal("Master refused stdio forwarding request: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2134, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Master refused stdio forwarding request: %s" , e); |
2135 | case MUX_S_FAILURE0x80000003: |
2136 | if ((r = sshbuf_get_cstring(m, &e, NULL((void*)0))) != 0) |
2137 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2137, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
2138 | sshbuf_free(m); |
2139 | fatal("Stdio forwarding request failed: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2139, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Stdio forwarding request failed: %s" , e); |
2140 | default: |
2141 | sshbuf_free(m); |
2142 | error_f("unexpected response from master 0x%08x", type)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2142, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "unexpected response from master 0x%08x" , type); |
2143 | return -1; |
2144 | } |
2145 | muxclient_request_id++; |
2146 | |
2147 | ssh_signal(SIGHUP1, control_client_sighandler); |
2148 | ssh_signal(SIGINT2, control_client_sighandler); |
2149 | ssh_signal(SIGTERM15, control_client_sighandler); |
2150 | ssh_signal(SIGWINCH28, control_client_sigrelay); |
2151 | |
2152 | /* |
2153 | * Stick around until the controlee closes the client_fd. |
2154 | */ |
2155 | sshbuf_reset(m); |
2156 | if (mux_client_read_packet(fd, m) != 0) { |
2157 | if (errno(*__errno()) == EPIPE32 || |
2158 | (errno(*__errno()) == EINTR4 && muxclient_terminate != 0)) |
2159 | return 0; |
2160 | fatal_f("mux_client_read_packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2160, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "mux_client_read_packet: %s" , strerror((*__errno()))); |
2161 | } |
2162 | fatal_f("master returned unexpected message %u", type)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2162, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "master returned unexpected message %u" , type); |
2163 | } |
2164 | |
2165 | static void |
2166 | mux_client_request_stop_listening(int fd) |
2167 | { |
2168 | struct sshbuf *m; |
2169 | char *e; |
2170 | u_int type, rid; |
2171 | int r; |
2172 | |
2173 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2173, 1 , SYSLOG_LEVEL_DEBUG3, ((void*)0), "entering"); |
2174 | |
2175 | if ((m = sshbuf_new()) == NULL((void*)0)) |
2176 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2176, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "sshbuf_new"); |
2177 | if ((r = sshbuf_put_u32(m, MUX_C_STOP_LISTENING0x10000009)) != 0 || |
2178 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0) |
2179 | fatal_fr(r, "request")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2179, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request"); |
2180 | |
2181 | if (mux_client_write_packet(fd, m) != 0) |
2182 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2182, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "write packet: %s", strerror ((*__errno()))); |
2183 | |
2184 | sshbuf_reset(m); |
2185 | |
2186 | /* Read their reply */ |
2187 | if (mux_client_read_packet(fd, m) != 0) |
2188 | fatal_f("read from master failed: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2188, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "read from master failed: %s" , strerror((*__errno()))); |
2189 | |
2190 | if ((r = sshbuf_get_u32(m, &type)) != 0 || |
2191 | (r = sshbuf_get_u32(m, &rid)) != 0) |
2192 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2192, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
2193 | if (rid != muxclient_request_id) |
2194 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2195, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
2195 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2195, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
2196 | |
2197 | switch (type) { |
2198 | case MUX_S_OK0x80000001: |
2199 | break; |
2200 | case MUX_S_PERMISSION_DENIED0x80000002: |
2201 | if ((r = sshbuf_get_cstring(m, &e, NULL((void*)0))) != 0) |
2202 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2202, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
2203 | fatal("Master refused stop listening request: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2203, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Master refused stop listening request: %s" , e); |
2204 | case MUX_S_FAILURE0x80000003: |
2205 | if ((r = sshbuf_get_cstring(m, &e, NULL((void*)0))) != 0) |
2206 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2206, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
2207 | fatal_f("stop listening request failed: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2207, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "stop listening request failed: %s" , e); |
2208 | default: |
2209 | fatal_f("unexpected response from master 0x%08x", type)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2209, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "unexpected response from master 0x%08x" , type); |
2210 | } |
2211 | sshbuf_free(m); |
2212 | muxclient_request_id++; |
2213 | } |
2214 | |
2215 | /* Multiplex client main loop. */ |
2216 | int |
2217 | muxclient(const char *path) |
2218 | { |
2219 | struct sockaddr_un addr; |
2220 | int sock; |
2221 | u_int pid; |
2222 | |
2223 | if (muxclient_command == 0) { |
2224 | if (options.stdio_forward_host != NULL((void*)0)) |
2225 | muxclient_command = SSHMUX_COMMAND_STDIO_FWD4; |
2226 | else |
2227 | muxclient_command = SSHMUX_COMMAND_OPEN1; |
2228 | } |
2229 | |
2230 | switch (options.control_master) { |
2231 | case SSHCTL_MASTER_AUTO2: |
2232 | case SSHCTL_MASTER_AUTO_ASK4: |
2233 | debug("auto-mux: Trying existing master")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2233, 0 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "auto-mux: Trying existing master" ); |
2234 | /* FALLTHROUGH */ |
2235 | case SSHCTL_MASTER_NO0: |
2236 | break; |
2237 | default: |
2238 | return -1; |
2239 | } |
2240 | |
2241 | memset(&addr, '\0', sizeof(addr)); |
2242 | addr.sun_family = AF_UNIX1; |
2243 | |
2244 | if (strlcpy(addr.sun_path, path, |
2245 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) |
2246 | fatal("ControlPath too long ('%s' >= %u bytes)", path,sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2247, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "ControlPath too long ('%s' >= %u bytes)" , path, (unsigned int)sizeof(addr.sun_path)) |
2247 | (unsigned int)sizeof(addr.sun_path))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2247, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "ControlPath too long ('%s' >= %u bytes)" , path, (unsigned int)sizeof(addr.sun_path)); |
2248 | |
2249 | if ((sock = socket(PF_UNIX1, SOCK_STREAM1, 0)) == -1) |
2250 | fatal_f("socket(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2250, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "socket(): %s", strerror( (*__errno()))); |
2251 | |
2252 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
2253 | switch (muxclient_command) { |
2254 | case SSHMUX_COMMAND_OPEN1: |
2255 | case SSHMUX_COMMAND_STDIO_FWD4: |
2256 | break; |
2257 | default: |
2258 | fatal("Control socket connect(%.100s): %s", path,sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2259, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Control socket connect(%.100s): %s" , path, strerror((*__errno()))) |
2259 | strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2259, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "Control socket connect(%.100s): %s" , path, strerror((*__errno()))); |
2260 | } |
2261 | if (errno(*__errno()) == ECONNREFUSED61 && |
2262 | options.control_master != SSHCTL_MASTER_NO0) { |
2263 | debug("Stale control socket %.100s, unlinking", path)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2263, 0 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "Stale control socket %.100s, unlinking" , path); |
2264 | unlink(path); |
2265 | } else if (errno(*__errno()) == ENOENT2) { |
2266 | debug("Control socket \"%.100s\" does not exist", path)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2266, 0 , SYSLOG_LEVEL_DEBUG1, ((void*)0), "Control socket \"%.100s\" does not exist" , path); |
2267 | } else { |
2268 | error("Control socket connect(%.100s): %s", path,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2269, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "Control socket connect(%.100s): %s" , path, strerror((*__errno()))) |
2269 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2269, 0 , SYSLOG_LEVEL_ERROR, ((void*)0), "Control socket connect(%.100s): %s" , path, strerror((*__errno()))); |
2270 | } |
2271 | close(sock); |
2272 | return -1; |
2273 | } |
2274 | set_nonblock(sock); |
2275 | |
2276 | if (mux_client_hello_exchange(sock) != 0) { |
2277 | error_f("master hello exchange failed")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2277, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "master hello exchange failed" ); |
2278 | close(sock); |
2279 | return -1; |
2280 | } |
2281 | |
2282 | switch (muxclient_command) { |
2283 | case SSHMUX_COMMAND_ALIVE_CHECK2: |
2284 | if ((pid = mux_client_request_alive(sock)) == 0) |
2285 | fatal_f("master alive check failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2285, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "master alive check failed" ); |
2286 | fprintf(stderr(&__sF[2]), "Master running (pid=%u)\r\n", pid); |
2287 | exit(0); |
2288 | case SSHMUX_COMMAND_TERMINATE3: |
2289 | mux_client_request_terminate(sock); |
2290 | if (options.log_level != SYSLOG_LEVEL_QUIET) |
2291 | fprintf(stderr(&__sF[2]), "Exit request sent.\r\n"); |
2292 | exit(0); |
2293 | case SSHMUX_COMMAND_FORWARD5: |
2294 | if (mux_client_forwards(sock, 0) != 0) |
2295 | fatal_f("master forward request failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2295, 1, SYSLOG_LEVEL_FATAL, ((void*)0), "master forward request failed" ); |
2296 | exit(0); |
2297 | case SSHMUX_COMMAND_OPEN1: |
2298 | if (mux_client_forwards(sock, 0) != 0) { |
2299 | error_f("master forward request failed")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2299, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "master forward request failed" ); |
2300 | return -1; |
2301 | } |
2302 | mux_client_request_session(sock); |
2303 | return -1; |
2304 | case SSHMUX_COMMAND_STDIO_FWD4: |
2305 | mux_client_request_stdio_fwd(sock); |
2306 | exit(0); |
2307 | case SSHMUX_COMMAND_STOP6: |
2308 | mux_client_request_stop_listening(sock); |
2309 | if (options.log_level != SYSLOG_LEVEL_QUIET) |
2310 | fprintf(stderr(&__sF[2]), "Stop listening request sent.\r\n"); |
2311 | exit(0); |
2312 | case SSHMUX_COMMAND_CANCEL_FWD7: |
2313 | if (mux_client_forwards(sock, 1) != 0) |
2314 | error_f("master cancel forward request failed")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2314, 1 , SYSLOG_LEVEL_ERROR, ((void*)0), "master cancel forward request failed" ); |
2315 | exit(0); |
2316 | case SSHMUX_COMMAND_PROXY8: |
2317 | mux_client_proxy(sock); |
2318 | return (sock); |
2319 | default: |
2320 | fatal("unrecognised muxclient_command %d", muxclient_command)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2320, 0, SYSLOG_LEVEL_FATAL, ((void*)0), "unrecognised muxclient_command %d" , muxclient_command); |
2321 | } |
2322 | } |