| File: | src/usr.bin/ssh/ssh/../mux.c |
| Warning: | line 686, 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 1.101 2023/11/23 03:37:05 dtucker 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 <limits.h> |
| 30 | #include <signal.h> |
| 31 | #include <stdarg.h> |
| 32 | #include <stddef.h> |
| 33 | #include <stdlib.h> |
| 34 | #include <stdio.h> |
| 35 | #include <string.h> |
| 36 | #include <unistd.h> |
| 37 | #include <util.h> |
| 38 | #include <paths.h> |
| 39 | |
| 40 | #include "atomicio.h" |
| 41 | #include "xmalloc.h" |
| 42 | #include "log.h" |
| 43 | #include "ssh.h" |
| 44 | #include "ssh2.h" |
| 45 | #include "pathnames.h" |
| 46 | #include "misc.h" |
| 47 | #include "match.h" |
| 48 | #include "sshbuf.h" |
| 49 | #include "channels.h" |
| 50 | #include "msg.h" |
| 51 | #include "packet.h" |
| 52 | #include "monitor_fdpass.h" |
| 53 | #include "sshpty.h" |
| 54 | #include "sshkey.h" |
| 55 | #include "readconf.h" |
| 56 | #include "clientloop.h" |
| 57 | #include "ssherr.h" |
| 58 | #include "misc.h" |
| 59 | |
| 60 | /* from ssh.c */ |
| 61 | extern int tty_flag; |
| 62 | extern Options options; |
| 63 | extern char *host; |
| 64 | extern struct sshbuf *command; |
| 65 | extern volatile sig_atomic_t quit_pending; |
| 66 | |
| 67 | /* Context for session open confirmation callback */ |
| 68 | struct mux_session_confirm_ctx { |
| 69 | u_int want_tty; |
| 70 | u_int want_subsys; |
| 71 | u_int want_x_fwd; |
| 72 | u_int want_agent_fwd; |
| 73 | struct sshbuf *cmd; |
| 74 | char *term; |
| 75 | struct termios tio; |
| 76 | char **env; |
| 77 | u_int rid; |
| 78 | }; |
| 79 | |
| 80 | /* Context for stdio fwd open confirmation callback */ |
| 81 | struct mux_stdio_confirm_ctx { |
| 82 | u_int rid; |
| 83 | }; |
| 84 | |
| 85 | /* Context for global channel callback */ |
| 86 | struct mux_channel_confirm_ctx { |
| 87 | u_int cid; /* channel id */ |
| 88 | u_int rid; /* request id */ |
| 89 | int fid; /* forward id */ |
| 90 | }; |
| 91 | |
| 92 | /* fd to control socket */ |
| 93 | int muxserver_sock = -1; |
| 94 | |
| 95 | /* client request id */ |
| 96 | u_int muxclient_request_id = 0; |
| 97 | |
| 98 | /* Multiplexing control command */ |
| 99 | u_int muxclient_command = 0; |
| 100 | |
| 101 | /* Set when signalled. */ |
| 102 | static volatile sig_atomic_t muxclient_terminate = 0; |
| 103 | |
| 104 | /* PID of multiplex server */ |
| 105 | static u_int muxserver_pid = 0; |
| 106 | |
| 107 | static Channel *mux_listener_channel = NULL((void *)0); |
| 108 | |
| 109 | struct mux_master_state { |
| 110 | int hello_rcvd; |
| 111 | }; |
| 112 | |
| 113 | /* mux protocol messages */ |
| 114 | #define MUX_MSG_HELLO0x00000001 0x00000001 |
| 115 | #define MUX_C_NEW_SESSION0x10000002 0x10000002 |
| 116 | #define MUX_C_ALIVE_CHECK0x10000004 0x10000004 |
| 117 | #define MUX_C_TERMINATE0x10000005 0x10000005 |
| 118 | #define MUX_C_OPEN_FWD0x10000006 0x10000006 |
| 119 | #define MUX_C_CLOSE_FWD0x10000007 0x10000007 |
| 120 | #define MUX_C_NEW_STDIO_FWD0x10000008 0x10000008 |
| 121 | #define MUX_C_STOP_LISTENING0x10000009 0x10000009 |
| 122 | #define MUX_C_PROXY0x1000000f 0x1000000f |
| 123 | #define MUX_S_OK0x80000001 0x80000001 |
| 124 | #define MUX_S_PERMISSION_DENIED0x80000002 0x80000002 |
| 125 | #define MUX_S_FAILURE0x80000003 0x80000003 |
| 126 | #define MUX_S_EXIT_MESSAGE0x80000004 0x80000004 |
| 127 | #define MUX_S_ALIVE0x80000005 0x80000005 |
| 128 | #define MUX_S_SESSION_OPENED0x80000006 0x80000006 |
| 129 | #define MUX_S_REMOTE_PORT0x80000007 0x80000007 |
| 130 | #define MUX_S_TTY_ALLOC_FAIL0x80000008 0x80000008 |
| 131 | #define MUX_S_PROXY0x8000000f 0x8000000f |
| 132 | |
| 133 | /* type codes for MUX_C_OPEN_FWD and MUX_C_CLOSE_FWD */ |
| 134 | #define MUX_FWD_LOCAL1 1 |
| 135 | #define MUX_FWD_REMOTE2 2 |
| 136 | #define MUX_FWD_DYNAMIC3 3 |
| 137 | |
| 138 | static void mux_session_confirm(struct ssh *, int, int, void *); |
| 139 | static void mux_stdio_confirm(struct ssh *, int, int, void *); |
| 140 | |
| 141 | static int mux_master_process_hello(struct ssh *, u_int, |
| 142 | Channel *, struct sshbuf *, struct sshbuf *); |
| 143 | static int mux_master_process_new_session(struct ssh *, u_int, |
| 144 | Channel *, struct sshbuf *, struct sshbuf *); |
| 145 | static int mux_master_process_alive_check(struct ssh *, u_int, |
| 146 | Channel *, struct sshbuf *, struct sshbuf *); |
| 147 | static int mux_master_process_terminate(struct ssh *, u_int, |
| 148 | Channel *, struct sshbuf *, struct sshbuf *); |
| 149 | static int mux_master_process_open_fwd(struct ssh *, u_int, |
| 150 | Channel *, struct sshbuf *, struct sshbuf *); |
| 151 | static int mux_master_process_close_fwd(struct ssh *, u_int, |
| 152 | Channel *, struct sshbuf *, struct sshbuf *); |
| 153 | static int mux_master_process_stdio_fwd(struct ssh *, u_int, |
| 154 | Channel *, struct sshbuf *, struct sshbuf *); |
| 155 | static int mux_master_process_stop_listening(struct ssh *, u_int, |
| 156 | Channel *, struct sshbuf *, struct sshbuf *); |
| 157 | static int mux_master_process_proxy(struct ssh *, u_int, |
| 158 | Channel *, struct sshbuf *, struct sshbuf *); |
| 159 | |
| 160 | static const struct { |
| 161 | u_int type; |
| 162 | int (*handler)(struct ssh *, u_int, Channel *, |
| 163 | struct sshbuf *, struct sshbuf *); |
| 164 | } mux_master_handlers[] = { |
| 165 | { MUX_MSG_HELLO0x00000001, mux_master_process_hello }, |
| 166 | { MUX_C_NEW_SESSION0x10000002, mux_master_process_new_session }, |
| 167 | { MUX_C_ALIVE_CHECK0x10000004, mux_master_process_alive_check }, |
| 168 | { MUX_C_TERMINATE0x10000005, mux_master_process_terminate }, |
| 169 | { MUX_C_OPEN_FWD0x10000006, mux_master_process_open_fwd }, |
| 170 | { MUX_C_CLOSE_FWD0x10000007, mux_master_process_close_fwd }, |
| 171 | { MUX_C_NEW_STDIO_FWD0x10000008, mux_master_process_stdio_fwd }, |
| 172 | { MUX_C_STOP_LISTENING0x10000009, mux_master_process_stop_listening }, |
| 173 | { MUX_C_PROXY0x1000000f, mux_master_process_proxy }, |
| 174 | { 0, NULL((void *)0) } |
| 175 | }; |
| 176 | |
| 177 | /* Cleanup callback fired on closure of mux client _session_ channel */ |
| 178 | static void |
| 179 | mux_master_session_cleanup_cb(struct ssh *ssh, int cid, int force, void *unused) |
| 180 | { |
| 181 | Channel *cc, *c = channel_by_id(ssh, cid); |
| 182 | |
| 183 | debug3_f("entering for channel %d", cid)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 183, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "entering for channel %d", cid); |
| 184 | if (c == NULL((void *)0)) |
| 185 | fatal_f("channel_by_id(%i) == NULL", cid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 185, 1 , SYSLOG_LEVEL_FATAL, ((void *)0), "channel_by_id(%i) == NULL" , cid); |
| 186 | if (c->ctl_chan != -1) { |
| 187 | if ((cc = channel_by_id(ssh, c->ctl_chan)) == NULL((void *)0)) |
| 188 | fatal_f("channel %d missing control channel %d",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 189, 1 , SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d missing control channel %d" , c->self, c->ctl_chan) |
| 189 | c->self, c->ctl_chan)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 189, 1 , SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d missing control channel %d" , c->self, c->ctl_chan); |
| 190 | c->ctl_chan = -1; |
| 191 | cc->remote_id = 0; |
| 192 | cc->have_remote_id = 0; |
| 193 | chan_rcvd_oclose(ssh, cc); |
| 194 | } |
| 195 | channel_cancel_cleanup(ssh, c->self); |
| 196 | } |
| 197 | |
| 198 | /* Cleanup callback fired on closure of mux client _control_ channel */ |
| 199 | static void |
| 200 | mux_master_control_cleanup_cb(struct ssh *ssh, int cid, int force, 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(const char *env) |
| 231 | { |
| 232 | u_int i; |
| 233 | int ret; |
| 234 | char name[1024], *cp; |
| 235 | |
| 236 | if ((cp = strchr(env, '=')) == NULL((void *)0) || cp == env) |
| 237 | return 0; |
| 238 | ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env); |
| 239 | if (ret <= 0 || (size_t)ret >= sizeof(name)) { |
| 240 | error_f("name '%.100s...' too long", env)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 240, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "name '%.100s...' too long" , env); |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | for (i = 0; i < options.num_send_env; i++) |
| 245 | if (match_pattern(name, options.send_env[i])) |
| 246 | return 1; |
| 247 | |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | /* Mux master protocol message handlers */ |
| 252 | |
| 253 | static int |
| 254 | mux_master_process_hello(struct ssh *ssh, u_int rid, |
| 255 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
| 256 | { |
| 257 | u_int ver; |
| 258 | struct mux_master_state *state = (struct mux_master_state *)c->mux_ctx; |
| 259 | int r; |
| 260 | |
| 261 | if (state == NULL((void *)0)) |
| 262 | fatal_f("channel %d: c->mux_ctx == NULL", c->self)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 262, 1 , SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d: c->mux_ctx == NULL" , c->self); |
| 263 | if (state->hello_rcvd) { |
| 264 | error_f("HELLO received twice")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 264, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "HELLO received twice"); |
| 265 | return -1; |
| 266 | } |
| 267 | if ((r = sshbuf_get_u32(m, &ver)) != 0) { |
| 268 | error_fr(r, "parse")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 268, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse"); |
| 269 | return -1; |
| 270 | } |
| 271 | if (ver != SSHMUX_VER4) { |
| 272 | error_f("unsupported multiplexing protocol version %u "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 273, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "unsupported multiplexing protocol version %u " "(expected %u)", ver, 4) |
| 273 | "(expected %u)", ver, SSHMUX_VER)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 273, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "unsupported multiplexing protocol version %u " "(expected %u)", ver, 4); |
| 274 | return -1; |
| 275 | } |
| 276 | debug2_f("channel %d client version %u", c->self, ver)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 276, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d client version %u" , c->self, ver); |
| 277 | |
| 278 | /* No extensions are presently defined */ |
| 279 | while (sshbuf_len(m) > 0) { |
| 280 | char *name = NULL((void *)0); |
| 281 | size_t value_len = 0; |
| 282 | |
| 283 | if ((r = sshbuf_get_cstring(m, &name, NULL((void *)0))) != 0 || |
| 284 | (r = sshbuf_get_string_direct(m, NULL((void *)0), &value_len)) != 0) { |
| 285 | error_fr(r, "parse extension")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 285, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "parse extension"); |
| 286 | return -1; |
| 287 | } |
| 288 | debug2_f("Unrecognised extension \"%s\" length %zu",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 289, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "Unrecognised extension \"%s\" length %zu" , name, value_len) |
| 289 | name, value_len)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 289, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "Unrecognised extension \"%s\" length %zu" , name, value_len); |
| 290 | free(name); |
| 291 | } |
| 292 | state->hello_rcvd = 1; |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | /* Enqueue a "ok" response to the reply buffer */ |
| 297 | static void |
| 298 | reply_ok(struct sshbuf *reply, u_int rid) |
| 299 | { |
| 300 | int r; |
| 301 | |
| 302 | if ((r = sshbuf_put_u32(reply, MUX_S_OK0x80000001)) != 0 || |
| 303 | (r = sshbuf_put_u32(reply, rid)) != 0) |
| 304 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 304, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
| 305 | } |
| 306 | |
| 307 | /* Enqueue an error response to the reply buffer */ |
| 308 | static void |
| 309 | reply_error(struct sshbuf *reply, u_int type, u_int rid, const char *msg) |
| 310 | { |
| 311 | int r; |
| 312 | |
| 313 | if ((r = sshbuf_put_u32(reply, type)) != 0 || |
| 314 | (r = sshbuf_put_u32(reply, rid)) != 0 || |
| 315 | (r = sshbuf_put_cstring(reply, msg)) != 0) |
| 316 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 316, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
| 317 | } |
| 318 | |
| 319 | static int |
| 320 | mux_master_process_new_session(struct ssh *ssh, u_int rid, |
| 321 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
| 322 | { |
| 323 | Channel *nc; |
| 324 | struct mux_session_confirm_ctx *cctx; |
| 325 | char *cmd, *cp; |
| 326 | u_int i, j, env_len, escape_char, window, packetmax; |
| 327 | int r, new_fd[3]; |
| 328 | |
| 329 | /* Reply for SSHMUX_COMMAND_OPEN */ |
| 330 | cctx = xcalloc(1, sizeof(*cctx)); |
| 331 | cctx->term = NULL((void *)0); |
| 332 | cctx->rid = rid; |
| 333 | cmd = NULL((void *)0); |
| 334 | cctx->env = NULL((void *)0); |
| 335 | env_len = 0; |
| 336 | if ((r = sshbuf_skip_string(m)sshbuf_get_string_direct(m, ((void *)0), ((void *)0))) != 0 || /* reserved */ |
| 337 | (r = sshbuf_get_u32(m, &cctx->want_tty)) != 0 || |
| 338 | (r = sshbuf_get_u32(m, &cctx->want_x_fwd)) != 0 || |
| 339 | (r = sshbuf_get_u32(m, &cctx->want_agent_fwd)) != 0 || |
| 340 | (r = sshbuf_get_u32(m, &cctx->want_subsys)) != 0 || |
| 341 | (r = sshbuf_get_u32(m, &escape_char)) != 0 || |
| 342 | (r = sshbuf_get_cstring(m, &cctx->term, NULL((void *)0))) != 0 || |
| 343 | (r = sshbuf_get_cstring(m, &cmd, NULL((void *)0))) != 0) { |
| 344 | malf: |
| 345 | free(cmd); |
| 346 | for (j = 0; j < env_len; j++) |
| 347 | free(cctx->env[j]); |
| 348 | free(cctx->env); |
| 349 | free(cctx->term); |
| 350 | free(cctx); |
| 351 | error_f("malformed message")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 351, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "malformed message"); |
| 352 | return -1; |
| 353 | } |
| 354 | |
| 355 | #define MUX_MAX_ENV_VARS4096 4096 |
| 356 | while (sshbuf_len(m) > 0) { |
| 357 | if ((r = sshbuf_get_cstring(m, &cp, NULL((void *)0))) != 0) |
| 358 | goto malf; |
| 359 | if (!env_permitted(cp)) { |
| 360 | free(cp); |
| 361 | continue; |
| 362 | } |
| 363 | cctx->env = xreallocarray(cctx->env, env_len + 2, |
| 364 | sizeof(*cctx->env)); |
| 365 | cctx->env[env_len++] = cp; |
| 366 | cctx->env[env_len] = NULL((void *)0); |
| 367 | if (env_len > MUX_MAX_ENV_VARS4096) { |
| 368 | error_f(">%d environment variables received, "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 369, 1, SYSLOG_LEVEL_ERROR, ((void *)0), ">%d environment variables received, " "ignoring additional", 4096) |
| 369 | "ignoring additional", MUX_MAX_ENV_VARS)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 369, 1, SYSLOG_LEVEL_ERROR, ((void *)0), ">%d environment variables received, " "ignoring additional", 4096); |
| 370 | break; |
| 371 | } |
| 372 | } |
| 373 | |
| 374 | debug2_f("channel %d: request tty %d, X %d, agent %d, subsys %d, "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 377, 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 | "term \"%s\", cmd \"%s\", env %u", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 377, 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_tty, cctx->want_x_fwd, cctx->want_agent_fwd,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 377, 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 | cctx->want_subsys, cctx->term, cmd, env_len)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 377, 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); |
| 378 | |
| 379 | if ((cctx->cmd = sshbuf_new()) == NULL((void *)0)) |
| 380 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 380, 1 , SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 381 | if ((r = sshbuf_put(cctx->cmd, cmd, strlen(cmd))) != 0) |
| 382 | fatal_fr(r, "sshbuf_put")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 382, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put"); |
| 383 | free(cmd); |
| 384 | cmd = NULL((void *)0); |
| 385 | |
| 386 | /* Gather fds from client */ |
| 387 | for(i = 0; i < 3; i++) { |
| 388 | if ((new_fd[i] = mm_receive_fd(c->sock)) == -1) { |
| 389 | error_f("failed to receive fd %d from client", i)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 389, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "failed to receive fd %d from client" , i); |
| 390 | for (j = 0; j < i; j++) |
| 391 | close(new_fd[j]); |
| 392 | for (j = 0; j < env_len; j++) |
| 393 | free(cctx->env[j]); |
| 394 | free(cctx->env); |
| 395 | free(cctx->term); |
| 396 | sshbuf_free(cctx->cmd); |
| 397 | free(cctx); |
| 398 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, |
| 399 | "did not receive file descriptors"); |
| 400 | return -1; |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | debug3_f("got fds stdin %d, stdout %d, stderr %d",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 405, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "got fds stdin %d, stdout %d, stderr %d" , new_fd[0], new_fd[1], new_fd[2]) |
| 405 | new_fd[0], new_fd[1], new_fd[2])sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 405, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "got fds stdin %d, stdout %d, stderr %d" , new_fd[0], new_fd[1], new_fd[2]); |
| 406 | |
| 407 | /* XXX support multiple child sessions in future */ |
| 408 | if (c->have_remote_id) { |
| 409 | debug2_f("session already open")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 409, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "session already open"); |
| 410 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, |
| 411 | "Multiple sessions not supported"); |
| 412 | cleanup: |
| 413 | close(new_fd[0]); |
| 414 | close(new_fd[1]); |
| 415 | close(new_fd[2]); |
| 416 | free(cctx->term); |
| 417 | if (env_len != 0) { |
| 418 | for (i = 0; i < env_len; i++) |
| 419 | free(cctx->env[i]); |
| 420 | free(cctx->env); |
| 421 | } |
| 422 | sshbuf_free(cctx->cmd); |
| 423 | free(cctx); |
| 424 | return 0; |
| 425 | } |
| 426 | |
| 427 | if (options.control_master == SSHCTL_MASTER_ASK3 || |
| 428 | options.control_master == SSHCTL_MASTER_AUTO_ASK4) { |
| 429 | if (!ask_permission("Allow shared connection to %s? ", host)) { |
| 430 | debug2_f("session refused by user")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 430, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "session refused by user"); |
| 431 | reply_error(reply, MUX_S_PERMISSION_DENIED0x80000002, rid, |
| 432 | "Permission denied"); |
| 433 | goto cleanup; |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | /* Try to pick up ttymodes from client before it goes raw */ |
| 438 | if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1) |
| 439 | error_f("tcgetattr: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 439, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "tcgetattr: %s", strerror(( *__errno()))); |
| 440 | |
| 441 | window = CHAN_SES_WINDOW_DEFAULT(64*(32*1024)); |
| 442 | packetmax = CHAN_SES_PACKET_DEFAULT(32*1024); |
| 443 | if (cctx->want_tty) { |
| 444 | window >>= 1; |
| 445 | packetmax >>= 1; |
| 446 | } |
| 447 | |
| 448 | nc = channel_new(ssh, "session", SSH_CHANNEL_OPENING3, |
| 449 | new_fd[0], new_fd[1], new_fd[2], window, packetmax, |
| 450 | CHAN_EXTENDED_WRITE2, "client-session", CHANNEL_NONBLOCK_STDIO2); |
| 451 | |
| 452 | nc->ctl_chan = c->self; /* link session -> control channel */ |
| 453 | c->remote_id = nc->self; /* link control -> session channel */ |
| 454 | c->have_remote_id = 1; |
| 455 | |
| 456 | if (cctx->want_tty && escape_char != 0xffffffff) { |
| 457 | channel_register_filter(ssh, nc->self, |
| 458 | client_simple_escape_filter, NULL((void *)0), |
| 459 | client_filter_cleanup, |
| 460 | client_new_escape_filter_ctx((int)escape_char)); |
| 461 | } |
| 462 | |
| 463 | debug2_f("channel_new: %d linked to control channel %d",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 464, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel_new: %d linked to control channel %d" , nc->self, nc->ctl_chan) |
| 464 | nc->self, nc->ctl_chan)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 464, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel_new: %d linked to control channel %d" , nc->self, nc->ctl_chan); |
| 465 | |
| 466 | channel_send_open(ssh, nc->self); |
| 467 | channel_register_open_confirm(ssh, nc->self, mux_session_confirm, cctx); |
| 468 | c->mux_pause = 1; /* stop handling messages until open_confirm done */ |
| 469 | channel_register_cleanup(ssh, nc->self, |
| 470 | mux_master_session_cleanup_cb, 1); |
| 471 | |
| 472 | /* reply is deferred, sent by mux_session_confirm */ |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | static int |
| 477 | mux_master_process_alive_check(struct ssh *ssh, u_int rid, |
| 478 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
| 479 | { |
| 480 | int r; |
| 481 | |
| 482 | debug2_f("channel %d: alive check", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 482, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: alive check", c->self); |
| 483 | |
| 484 | /* prepare reply */ |
| 485 | if ((r = sshbuf_put_u32(reply, MUX_S_ALIVE0x80000005)) != 0 || |
| 486 | (r = sshbuf_put_u32(reply, rid)) != 0 || |
| 487 | (r = sshbuf_put_u32(reply, (u_int)getpid())) != 0) |
| 488 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 488, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
| 489 | |
| 490 | return 0; |
| 491 | } |
| 492 | |
| 493 | static int |
| 494 | mux_master_process_terminate(struct ssh *ssh, u_int rid, |
| 495 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
| 496 | { |
| 497 | debug2_f("channel %d: terminate request", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 497, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: terminate request" , c->self); |
| 498 | |
| 499 | if (options.control_master == SSHCTL_MASTER_ASK3 || |
| 500 | options.control_master == SSHCTL_MASTER_AUTO_ASK4) { |
| 501 | if (!ask_permission("Terminate shared connection to %s? ", |
| 502 | host)) { |
| 503 | debug2_f("termination refused by user")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 503, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "termination refused by user" ); |
| 504 | reply_error(reply, MUX_S_PERMISSION_DENIED0x80000002, rid, |
| 505 | "Permission denied"); |
| 506 | return 0; |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | quit_pending = 1; |
| 511 | reply_ok(reply, rid); |
| 512 | /* XXX exit happens too soon - message never makes it to client */ |
| 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | static char * |
| 517 | format_forward(u_int ftype, struct Forward *fwd) |
| 518 | { |
| 519 | char *ret; |
| 520 | |
| 521 | switch (ftype) { |
| 522 | case MUX_FWD_LOCAL1: |
| 523 | xasprintf(&ret, "local forward %.200s:%d -> %.200s:%d", |
| 524 | (fwd->listen_path != NULL((void *)0)) ? fwd->listen_path : |
| 525 | (fwd->listen_host == NULL((void *)0)) ? |
| 526 | (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") : |
| 527 | fwd->listen_host, fwd->listen_port, |
| 528 | (fwd->connect_path != NULL((void *)0)) ? fwd->connect_path : |
| 529 | fwd->connect_host, fwd->connect_port); |
| 530 | break; |
| 531 | case MUX_FWD_DYNAMIC3: |
| 532 | xasprintf(&ret, "dynamic forward %.200s:%d -> *", |
| 533 | (fwd->listen_host == NULL((void *)0)) ? |
| 534 | (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") : |
| 535 | fwd->listen_host, fwd->listen_port); |
| 536 | break; |
| 537 | case MUX_FWD_REMOTE2: |
| 538 | xasprintf(&ret, "remote forward %.200s:%d -> %.200s:%d", |
| 539 | (fwd->listen_path != NULL((void *)0)) ? fwd->listen_path : |
| 540 | (fwd->listen_host == NULL((void *)0)) ? |
| 541 | "LOCALHOST" : fwd->listen_host, |
| 542 | fwd->listen_port, |
| 543 | (fwd->connect_path != NULL((void *)0)) ? fwd->connect_path : |
| 544 | fwd->connect_host, fwd->connect_port); |
| 545 | break; |
| 546 | default: |
| 547 | fatal_f("unknown forward type %u", ftype)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 547, 1 , SYSLOG_LEVEL_FATAL, ((void *)0), "unknown forward type %u", ftype); |
| 548 | } |
| 549 | return ret; |
| 550 | } |
| 551 | |
| 552 | static int |
| 553 | compare_host(const char *a, const char *b) |
| 554 | { |
| 555 | if (a == NULL((void *)0) && b == NULL((void *)0)) |
| 556 | return 1; |
| 557 | if (a == NULL((void *)0) || b == NULL((void *)0)) |
| 558 | return 0; |
| 559 | return strcmp(a, b) == 0; |
| 560 | } |
| 561 | |
| 562 | static int |
| 563 | compare_forward(struct Forward *a, struct Forward *b) |
| 564 | { |
| 565 | if (!compare_host(a->listen_host, b->listen_host)) |
| 566 | return 0; |
| 567 | if (!compare_host(a->listen_path, b->listen_path)) |
| 568 | return 0; |
| 569 | if (a->listen_port != b->listen_port) |
| 570 | return 0; |
| 571 | if (!compare_host(a->connect_host, b->connect_host)) |
| 572 | return 0; |
| 573 | if (!compare_host(a->connect_path, b->connect_path)) |
| 574 | return 0; |
| 575 | if (a->connect_port != b->connect_port) |
| 576 | return 0; |
| 577 | |
| 578 | return 1; |
| 579 | } |
| 580 | |
| 581 | static void |
| 582 | mux_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt) |
| 583 | { |
| 584 | struct mux_channel_confirm_ctx *fctx = ctxt; |
| 585 | char *failmsg = NULL((void *)0); |
| 586 | struct Forward *rfwd; |
| 587 | Channel *c; |
| 588 | struct sshbuf *out; |
| 589 | u_int port; |
| 590 | int r; |
| 591 | |
| 592 | if ((c = channel_by_id(ssh, fctx->cid)) == NULL((void *)0)) { |
| 593 | /* no channel for reply */ |
| 594 | error_f("unknown channel")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 594, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "unknown channel"); |
| 595 | return; |
| 596 | } |
| 597 | if ((out = sshbuf_new()) == NULL((void *)0)) |
| 598 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 598, 1 , SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 599 | if (fctx->fid >= options.num_remote_forwards || |
| 600 | (options.remote_forwards[fctx->fid].connect_path == NULL((void *)0) && |
| 601 | options.remote_forwards[fctx->fid].connect_host == NULL((void *)0))) { |
| 602 | xasprintf(&failmsg, "unknown forwarding id %d", fctx->fid); |
| 603 | goto fail; |
| 604 | } |
| 605 | rfwd = &options.remote_forwards[fctx->fid]; |
| 606 | debug_f("%s for: listen %d, connect %s:%d",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 609, 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 | type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 609, 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->listen_port, rfwd->connect_path ? rfwd->connect_path :sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 609, 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 | rfwd->connect_host, rfwd->connect_port)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 609, 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); |
| 610 | if (type == SSH2_MSG_REQUEST_SUCCESS81) { |
| 611 | if (rfwd->listen_port == 0) { |
| 612 | if ((r = sshpkt_get_u32(ssh, &port)) != 0) |
| 613 | fatal_fr(r, "parse port")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 613, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "parse port"); |
| 614 | if (port > 65535) { |
| 615 | fatal("Invalid allocated port %u for "sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 617, 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 | "mux remote forward to %s:%d", port,sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 617, 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 | rfwd->connect_host, rfwd->connect_port)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 617, 0 , SYSLOG_LEVEL_FATAL, ((void *)0), "Invalid allocated port %u for " "mux remote forward to %s:%d", port, rfwd->connect_host, rfwd ->connect_port); |
| 618 | } |
| 619 | rfwd->allocated_port = (int)port; |
| 620 | debug("Allocated port %u for mux remote forward"sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 622, 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 | " to %s:%d", rfwd->allocated_port,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 622, 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 | rfwd->connect_host, rfwd->connect_port)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 622, 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); |
| 623 | if ((r = sshbuf_put_u32(out, |
| 624 | MUX_S_REMOTE_PORT0x80000007)) != 0 || |
| 625 | (r = sshbuf_put_u32(out, fctx->rid)) != 0 || |
| 626 | (r = sshbuf_put_u32(out, |
| 627 | rfwd->allocated_port)) != 0) |
| 628 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 628, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
| 629 | channel_update_permission(ssh, rfwd->handle, |
| 630 | rfwd->allocated_port); |
| 631 | } else { |
| 632 | reply_ok(out, fctx->rid); |
| 633 | } |
| 634 | goto out; |
| 635 | } else { |
| 636 | if (rfwd->listen_port == 0) |
| 637 | channel_update_permission(ssh, rfwd->handle, -1); |
| 638 | if (rfwd->listen_path != NULL((void *)0)) |
| 639 | xasprintf(&failmsg, "remote port forwarding failed for " |
| 640 | "listen path %s", rfwd->listen_path); |
| 641 | else |
| 642 | xasprintf(&failmsg, "remote port forwarding failed for " |
| 643 | "listen port %d", rfwd->listen_port); |
| 644 | |
| 645 | debug2_f("clearing registered forwarding for listen %d, "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 648, 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 | "connect %s:%d", rfwd->listen_port,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 648, 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_path ? rfwd->connect_path :sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 648, 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 | rfwd->connect_host, rfwd->connect_port)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 648, 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 ); |
| 649 | |
| 650 | free(rfwd->listen_host); |
| 651 | free(rfwd->listen_path); |
| 652 | free(rfwd->connect_host); |
| 653 | free(rfwd->connect_path); |
| 654 | memset(rfwd, 0, sizeof(*rfwd)); |
| 655 | } |
| 656 | fail: |
| 657 | error_f("%s", failmsg)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 657, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "%s", failmsg); |
| 658 | reply_error(out, MUX_S_FAILURE0x80000003, fctx->rid, failmsg); |
| 659 | free(failmsg); |
| 660 | out: |
| 661 | if ((r = sshbuf_put_stringb(c->output, out)) != 0) |
| 662 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 662, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
| 663 | sshbuf_free(out); |
| 664 | if (c->mux_pause <= 0) |
| 665 | fatal_f("mux_pause %d", c->mux_pause)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 665, 1 , SYSLOG_LEVEL_FATAL, ((void *)0), "mux_pause %d", c->mux_pause ); |
| 666 | c->mux_pause = 0; /* start processing messages again */ |
| 667 | } |
| 668 | |
| 669 | static int |
| 670 | mux_master_process_open_fwd(struct ssh *ssh, u_int rid, |
| 671 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
| 672 | { |
| 673 | struct Forward fwd; |
| 674 | char *fwd_desc = NULL((void *)0); |
| 675 | char *listen_addr, *connect_addr; |
| 676 | u_int ftype; |
| 677 | u_int lport, cport; |
| 678 | int r, i, ret = 0, freefwd = 1; |
| 679 | |
| 680 | memset(&fwd, 0, sizeof(fwd)); |
| 681 | |
| 682 | /* XXX - lport/cport check redundant */ |
| 683 | if ((r = sshbuf_get_u32(m, &ftype)) != 0 || |
| 684 | (r = sshbuf_get_cstring(m, &listen_addr, NULL((void *)0))) != 0 || |
| 685 | (r = sshbuf_get_u32(m, &lport)) != 0 || |
| 686 | (r = sshbuf_get_cstring(m, &connect_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' | |
| 687 | (r = sshbuf_get_u32(m, &cport)) != 0 || |
| 688 | (lport != (u_int)PORT_STREAMLOCAL-2 && lport > 65535) || |
| 689 | (cport != (u_int)PORT_STREAMLOCAL-2 && cport > 65535)) { |
| 690 | error_f("malformed message")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 690, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "malformed message"); |
| 691 | ret = -1; |
| 692 | goto out; |
| 693 | } |
| 694 | if (*listen_addr == '\0') { |
| 695 | free(listen_addr); |
| 696 | listen_addr = NULL((void *)0); |
| 697 | } |
| 698 | if (*connect_addr == '\0') { |
| 699 | free(connect_addr); |
| 700 | connect_addr = NULL((void *)0); |
| 701 | } |
| 702 | |
| 703 | memset(&fwd, 0, sizeof(fwd)); |
| 704 | fwd.listen_port = lport; |
| 705 | if (fwd.listen_port == PORT_STREAMLOCAL-2) |
| 706 | fwd.listen_path = listen_addr; |
| 707 | else |
| 708 | fwd.listen_host = listen_addr; |
| 709 | fwd.connect_port = cport; |
| 710 | if (fwd.connect_port == PORT_STREAMLOCAL-2) |
| 711 | fwd.connect_path = connect_addr; |
| 712 | else |
| 713 | fwd.connect_host = connect_addr; |
| 714 | |
| 715 | debug2_f("channel %d: request %s", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 716, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: request %s", c ->self, (fwd_desc = format_forward(ftype, &fwd))) |
| 716 | (fwd_desc = format_forward(ftype, &fwd)))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 716, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: request %s", c ->self, (fwd_desc = format_forward(ftype, &fwd))); |
| 717 | |
| 718 | if (ftype != MUX_FWD_LOCAL1 && ftype != MUX_FWD_REMOTE2 && |
| 719 | ftype != MUX_FWD_DYNAMIC3) { |
| 720 | logit_f("invalid forwarding type %u", ftype)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 720, 1, SYSLOG_LEVEL_INFO, ((void *)0), "invalid forwarding type %u" , ftype); |
| 721 | invalid: |
| 722 | free(listen_addr); |
| 723 | free(connect_addr); |
| 724 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, |
| 725 | "Invalid forwarding request"); |
| 726 | return 0; |
| 727 | } |
| 728 | if (ftype == MUX_FWD_DYNAMIC3 && fwd.listen_path) { |
| 729 | logit_f("streamlocal and dynamic forwards "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 730, 1, SYSLOG_LEVEL_INFO, ((void *)0), "streamlocal and dynamic forwards " "are mutually exclusive") |
| 730 | "are mutually exclusive")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 730, 1, SYSLOG_LEVEL_INFO, ((void *)0), "streamlocal and dynamic forwards " "are mutually exclusive"); |
| 731 | goto invalid; |
| 732 | } |
| 733 | if (fwd.listen_port != PORT_STREAMLOCAL-2 && fwd.listen_port >= 65536) { |
| 734 | logit_f("invalid listen port %u", fwd.listen_port)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 734, 1, SYSLOG_LEVEL_INFO, ((void *)0), "invalid listen port %u", fwd .listen_port); |
| 735 | goto invalid; |
| 736 | } |
| 737 | if ((fwd.connect_port != PORT_STREAMLOCAL-2 && |
| 738 | fwd.connect_port >= 65536) || |
| 739 | (ftype != MUX_FWD_DYNAMIC3 && ftype != MUX_FWD_REMOTE2 && |
| 740 | fwd.connect_port == 0)) { |
| 741 | logit_f("invalid connect port %u",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 742, 1, SYSLOG_LEVEL_INFO, ((void *)0), "invalid connect port %u", fwd .connect_port) |
| 742 | fwd.connect_port)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 742, 1, SYSLOG_LEVEL_INFO, ((void *)0), "invalid connect port %u", fwd .connect_port); |
| 743 | goto invalid; |
| 744 | } |
| 745 | if (ftype != MUX_FWD_DYNAMIC3 && fwd.connect_host == NULL((void *)0) && |
| 746 | fwd.connect_path == NULL((void *)0)) { |
| 747 | logit_f("missing connect host")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 747, 1, SYSLOG_LEVEL_INFO, ((void *)0), "missing connect host"); |
| 748 | goto invalid; |
| 749 | } |
| 750 | |
| 751 | /* Skip forwards that have already been requested */ |
| 752 | switch (ftype) { |
| 753 | case MUX_FWD_LOCAL1: |
| 754 | case MUX_FWD_DYNAMIC3: |
| 755 | for (i = 0; i < options.num_local_forwards; i++) { |
| 756 | if (compare_forward(&fwd, |
| 757 | options.local_forwards + i)) { |
| 758 | exists: |
| 759 | debug2_f("found existing forwarding")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 759, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "found existing forwarding" ); |
| 760 | reply_ok(reply, rid); |
| 761 | goto out; |
| 762 | } |
| 763 | } |
| 764 | break; |
| 765 | case MUX_FWD_REMOTE2: |
| 766 | for (i = 0; i < options.num_remote_forwards; i++) { |
| 767 | if (!compare_forward(&fwd, options.remote_forwards + i)) |
| 768 | continue; |
| 769 | if (fwd.listen_port != 0) |
| 770 | goto exists; |
| 771 | debug2_f("found allocated port")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 771, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "found allocated port"); |
| 772 | if ((r = sshbuf_put_u32(reply, |
| 773 | MUX_S_REMOTE_PORT0x80000007)) != 0 || |
| 774 | (r = sshbuf_put_u32(reply, rid)) != 0 || |
| 775 | (r = sshbuf_put_u32(reply, |
| 776 | options.remote_forwards[i].allocated_port)) != 0) |
| 777 | fatal_fr(r, "reply FWD_REMOTE")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 777, 1 , SYSLOG_LEVEL_FATAL, ssh_err(r), "reply FWD_REMOTE"); |
| 778 | goto out; |
| 779 | } |
| 780 | break; |
| 781 | } |
| 782 | |
| 783 | if (options.control_master == SSHCTL_MASTER_ASK3 || |
| 784 | options.control_master == SSHCTL_MASTER_AUTO_ASK4) { |
| 785 | if (!ask_permission("Open %s on %s?", fwd_desc, host)) { |
| 786 | debug2_f("forwarding refused by user")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 786, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "forwarding refused by user" ); |
| 787 | reply_error(reply, MUX_S_PERMISSION_DENIED0x80000002, rid, |
| 788 | "Permission denied"); |
| 789 | goto out; |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | if (ftype == MUX_FWD_LOCAL1 || ftype == MUX_FWD_DYNAMIC3) { |
| 794 | if (!channel_setup_local_fwd_listener(ssh, &fwd, |
| 795 | &options.fwd_opts)) { |
| 796 | fail: |
| 797 | logit_f("requested %s failed", fwd_desc)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 797, 1, SYSLOG_LEVEL_INFO, ((void *)0), "requested %s failed", fwd_desc ); |
| 798 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, |
| 799 | "Port forwarding failed"); |
| 800 | goto out; |
| 801 | } |
| 802 | add_local_forward(&options, &fwd); |
| 803 | freefwd = 0; |
| 804 | } else { |
| 805 | struct mux_channel_confirm_ctx *fctx; |
| 806 | |
| 807 | fwd.handle = channel_request_remote_forwarding(ssh, &fwd); |
| 808 | if (fwd.handle < 0) |
| 809 | goto fail; |
| 810 | add_remote_forward(&options, &fwd); |
| 811 | fctx = xcalloc(1, sizeof(*fctx)); |
| 812 | fctx->cid = c->self; |
| 813 | fctx->rid = rid; |
| 814 | fctx->fid = options.num_remote_forwards - 1; |
| 815 | client_register_global_confirm(mux_confirm_remote_forward, |
| 816 | fctx); |
| 817 | freefwd = 0; |
| 818 | c->mux_pause = 1; /* wait for mux_confirm_remote_forward */ |
| 819 | /* delayed reply in mux_confirm_remote_forward */ |
| 820 | goto out; |
| 821 | } |
| 822 | reply_ok(reply, rid); |
| 823 | out: |
| 824 | free(fwd_desc); |
| 825 | if (freefwd) { |
| 826 | free(fwd.listen_host); |
| 827 | free(fwd.listen_path); |
| 828 | free(fwd.connect_host); |
| 829 | free(fwd.connect_path); |
| 830 | } |
| 831 | return ret; |
| 832 | } |
| 833 | |
| 834 | static int |
| 835 | mux_master_process_close_fwd(struct ssh *ssh, u_int rid, |
| 836 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
| 837 | { |
| 838 | struct Forward fwd, *found_fwd; |
| 839 | char *fwd_desc = NULL((void *)0); |
| 840 | const char *error_reason = NULL((void *)0); |
| 841 | char *listen_addr = NULL((void *)0), *connect_addr = NULL((void *)0); |
| 842 | u_int ftype; |
| 843 | int r, i, ret = 0; |
| 844 | u_int lport, cport; |
| 845 | |
| 846 | memset(&fwd, 0, sizeof(fwd)); |
| 847 | |
| 848 | if ((r = sshbuf_get_u32(m, &ftype)) != 0 || |
| 849 | (r = sshbuf_get_cstring(m, &listen_addr, NULL((void *)0))) != 0 || |
| 850 | (r = sshbuf_get_u32(m, &lport)) != 0 || |
| 851 | (r = sshbuf_get_cstring(m, &connect_addr, NULL((void *)0))) != 0 || |
| 852 | (r = sshbuf_get_u32(m, &cport)) != 0 || |
| 853 | (lport != (u_int)PORT_STREAMLOCAL-2 && lport > 65535) || |
| 854 | (cport != (u_int)PORT_STREAMLOCAL-2 && cport > 65535)) { |
| 855 | error_f("malformed message")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 855, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "malformed message"); |
| 856 | ret = -1; |
| 857 | goto out; |
| 858 | } |
| 859 | |
| 860 | if (*listen_addr == '\0') { |
| 861 | free(listen_addr); |
| 862 | listen_addr = NULL((void *)0); |
| 863 | } |
| 864 | if (*connect_addr == '\0') { |
| 865 | free(connect_addr); |
| 866 | connect_addr = NULL((void *)0); |
| 867 | } |
| 868 | |
| 869 | memset(&fwd, 0, sizeof(fwd)); |
| 870 | fwd.listen_port = lport; |
| 871 | if (fwd.listen_port == PORT_STREAMLOCAL-2) |
| 872 | fwd.listen_path = listen_addr; |
| 873 | else |
| 874 | fwd.listen_host = listen_addr; |
| 875 | fwd.connect_port = cport; |
| 876 | if (fwd.connect_port == PORT_STREAMLOCAL-2) |
| 877 | fwd.connect_path = connect_addr; |
| 878 | else |
| 879 | fwd.connect_host = connect_addr; |
| 880 | |
| 881 | debug2_f("channel %d: request cancel %s", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 882, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: request cancel %s" , c->self, (fwd_desc = format_forward(ftype, &fwd))) |
| 882 | (fwd_desc = format_forward(ftype, &fwd)))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 882, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: request cancel %s" , c->self, (fwd_desc = format_forward(ftype, &fwd))); |
| 883 | |
| 884 | /* make sure this has been requested */ |
| 885 | found_fwd = NULL((void *)0); |
| 886 | switch (ftype) { |
| 887 | case MUX_FWD_LOCAL1: |
| 888 | case MUX_FWD_DYNAMIC3: |
| 889 | for (i = 0; i < options.num_local_forwards; i++) { |
| 890 | if (compare_forward(&fwd, |
| 891 | options.local_forwards + i)) { |
| 892 | found_fwd = options.local_forwards + i; |
| 893 | break; |
| 894 | } |
| 895 | } |
| 896 | break; |
| 897 | case MUX_FWD_REMOTE2: |
| 898 | for (i = 0; i < options.num_remote_forwards; i++) { |
| 899 | if (compare_forward(&fwd, |
| 900 | options.remote_forwards + i)) { |
| 901 | found_fwd = options.remote_forwards + i; |
| 902 | break; |
| 903 | } |
| 904 | } |
| 905 | break; |
| 906 | } |
| 907 | |
| 908 | if (found_fwd == NULL((void *)0)) |
| 909 | error_reason = "port not forwarded"; |
| 910 | else if (ftype == MUX_FWD_REMOTE2) { |
| 911 | /* |
| 912 | * This shouldn't fail unless we confused the host/port |
| 913 | * between options.remote_forwards and permitted_opens. |
| 914 | * However, for dynamic allocated listen ports we need |
| 915 | * to use the actual listen port. |
| 916 | */ |
| 917 | if (channel_request_rforward_cancel(ssh, found_fwd) == -1) |
| 918 | error_reason = "port not in permitted opens"; |
| 919 | } else { /* local and dynamic forwards */ |
| 920 | /* Ditto */ |
| 921 | if (channel_cancel_lport_listener(ssh, &fwd, fwd.connect_port, |
| 922 | &options.fwd_opts) == -1) |
| 923 | error_reason = "port not found"; |
| 924 | } |
| 925 | |
| 926 | if (error_reason != NULL((void *)0)) |
| 927 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, error_reason); |
| 928 | else { |
| 929 | reply_ok(reply, rid); |
| 930 | free(found_fwd->listen_host); |
| 931 | free(found_fwd->listen_path); |
| 932 | free(found_fwd->connect_host); |
| 933 | free(found_fwd->connect_path); |
| 934 | found_fwd->listen_host = found_fwd->connect_host = NULL((void *)0); |
| 935 | found_fwd->listen_path = found_fwd->connect_path = NULL((void *)0); |
| 936 | found_fwd->listen_port = found_fwd->connect_port = 0; |
| 937 | } |
| 938 | out: |
| 939 | free(fwd_desc); |
| 940 | free(listen_addr); |
| 941 | free(connect_addr); |
| 942 | |
| 943 | return ret; |
| 944 | } |
| 945 | |
| 946 | static int |
| 947 | mux_master_process_stdio_fwd(struct ssh *ssh, u_int rid, |
| 948 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
| 949 | { |
| 950 | Channel *nc; |
| 951 | char *chost = NULL((void *)0); |
| 952 | u_int _cport, i, j; |
| 953 | int ok = 0, cport, r, new_fd[2]; |
| 954 | struct mux_stdio_confirm_ctx *cctx; |
| 955 | |
| 956 | if ((r = sshbuf_skip_string(m)sshbuf_get_string_direct(m, ((void *)0), ((void *)0))) != 0 || /* reserved */ |
| 957 | (r = sshbuf_get_cstring(m, &chost, NULL((void *)0))) != 0 || |
| 958 | (r = sshbuf_get_u32(m, &_cport)) != 0) { |
| 959 | free(chost); |
| 960 | error_f("malformed message")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 960, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "malformed message"); |
| 961 | return -1; |
| 962 | } |
| 963 | if (_cport == (u_int)PORT_STREAMLOCAL-2) |
| 964 | cport = PORT_STREAMLOCAL-2; |
| 965 | else if (_cport <= INT_MAX0x7fffffff) |
| 966 | cport = (int)_cport; |
| 967 | else { |
| 968 | free(chost); |
| 969 | error_f("invalid port 0x%x", _cport)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 969, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "invalid port 0x%x", _cport ); |
| 970 | return -1; |
| 971 | } |
| 972 | |
| 973 | debug2_f("channel %d: stdio fwd to %s:%d", c->self, chost, cport)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 973, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel %d: stdio fwd to %s:%d" , c->self, chost, cport); |
| 974 | |
| 975 | /* Gather fds from client */ |
| 976 | for(i = 0; i < 2; i++) { |
| 977 | if ((new_fd[i] = mm_receive_fd(c->sock)) == -1) { |
| 978 | error_f("failed to receive fd %d from client", i)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 978, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "failed to receive fd %d from client" , i); |
| 979 | for (j = 0; j < i; j++) |
| 980 | close(new_fd[j]); |
| 981 | free(chost); |
| 982 | |
| 983 | /* prepare reply */ |
| 984 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, |
| 985 | "did not receive file descriptors"); |
| 986 | return -1; |
| 987 | } |
| 988 | } |
| 989 | |
| 990 | debug3_f("got fds stdin %d, stdout %d", new_fd[0], new_fd[1])sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 990, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "got fds stdin %d, stdout %d" , new_fd[0], new_fd[1]); |
| 991 | |
| 992 | /* XXX support multiple child sessions in future */ |
| 993 | if (c->have_remote_id) { |
| 994 | debug2_f("session already open")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 994, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "session already open"); |
| 995 | reply_error(reply, MUX_S_FAILURE0x80000003, rid, |
| 996 | "Multiple sessions not supported"); |
| 997 | cleanup: |
| 998 | close(new_fd[0]); |
| 999 | close(new_fd[1]); |
| 1000 | free(chost); |
| 1001 | return 0; |
| 1002 | } |
| 1003 | |
| 1004 | if (options.control_master == SSHCTL_MASTER_ASK3 || |
| 1005 | options.control_master == SSHCTL_MASTER_AUTO_ASK4) { |
| 1006 | if (cport == PORT_STREAMLOCAL-2) { |
| 1007 | ok = ask_permission("Allow forward to path %s", chost); |
| 1008 | } else { |
| 1009 | ok = ask_permission("Allow forward to [%s]:%d? ", |
| 1010 | chost, cport); |
| 1011 | } |
| 1012 | if (!ok) { |
| 1013 | debug2_f("stdio fwd refused by user")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1013, 1 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "stdio fwd refused by user" ); |
| 1014 | reply_error(reply, MUX_S_PERMISSION_DENIED0x80000002, rid, |
| 1015 | "Permission denied"); |
| 1016 | goto cleanup; |
| 1017 | } |
| 1018 | } |
| 1019 | |
| 1020 | nc = channel_connect_stdio_fwd(ssh, chost, cport, new_fd[0], new_fd[1], |
| 1021 | CHANNEL_NONBLOCK_STDIO2); |
| 1022 | free(chost); |
| 1023 | |
| 1024 | nc->ctl_chan = c->self; /* link session -> control channel */ |
| 1025 | c->remote_id = nc->self; /* link control -> session channel */ |
| 1026 | c->have_remote_id = 1; |
| 1027 | |
| 1028 | debug2_f("channel_new: %d control %d", nc->self, nc->ctl_chan)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1028, 1 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "channel_new: %d control %d" , nc->self, nc->ctl_chan); |
| 1029 | |
| 1030 | channel_register_cleanup(ssh, nc->self, |
| 1031 | mux_master_session_cleanup_cb, 1); |
| 1032 | |
| 1033 | cctx = xcalloc(1, sizeof(*cctx)); |
| 1034 | cctx->rid = rid; |
| 1035 | channel_register_open_confirm(ssh, nc->self, mux_stdio_confirm, cctx); |
| 1036 | c->mux_pause = 1; /* stop handling messages until open_confirm done */ |
| 1037 | |
| 1038 | /* reply is deferred, sent by mux_session_confirm */ |
| 1039 | return 0; |
| 1040 | } |
| 1041 | |
| 1042 | /* Callback on open confirmation in mux master for a mux stdio fwd session. */ |
| 1043 | static void |
| 1044 | mux_stdio_confirm(struct ssh *ssh, int id, int success, void *arg) |
| 1045 | { |
| 1046 | struct mux_stdio_confirm_ctx *cctx = arg; |
| 1047 | Channel *c, *cc; |
| 1048 | struct sshbuf *reply; |
| 1049 | int r; |
| 1050 | |
| 1051 | if (cctx == NULL((void *)0)) |
| 1052 | fatal_f("cctx == NULL")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1052, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "cctx == NULL"); |
| 1053 | if ((c = channel_by_id(ssh, id)) == NULL((void *)0)) |
| 1054 | fatal_f("no channel for id %d", id)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1054, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "no channel for id %d", id ); |
| 1055 | if ((cc = channel_by_id(ssh, c->ctl_chan)) == NULL((void *)0)) |
| 1056 | fatal_f("channel %d lacks control channel %d",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1057, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d lacks control channel %d" , id, c->ctl_chan) |
| 1057 | id, c->ctl_chan)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1057, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d lacks control channel %d" , id, c->ctl_chan); |
| 1058 | if ((reply = sshbuf_new()) == NULL((void *)0)) |
| 1059 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1059, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 1060 | |
| 1061 | if (!success) { |
| 1062 | debug3_f("sending failure reply")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1062, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "sending failure reply"); |
| 1063 | reply_error(reply, MUX_S_FAILURE0x80000003, cctx->rid, |
| 1064 | "Session open refused by peer"); |
| 1065 | /* prepare reply */ |
| 1066 | goto done; |
| 1067 | } |
| 1068 | |
| 1069 | debug3_f("sending success reply")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1069, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "sending success reply"); |
| 1070 | /* prepare reply */ |
| 1071 | if ((r = sshbuf_put_u32(reply, MUX_S_SESSION_OPENED0x80000006)) != 0 || |
| 1072 | (r = sshbuf_put_u32(reply, cctx->rid)) != 0 || |
| 1073 | (r = sshbuf_put_u32(reply, c->self)) != 0) |
| 1074 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1074, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
| 1075 | |
| 1076 | done: |
| 1077 | /* Send reply */ |
| 1078 | if ((r = sshbuf_put_stringb(cc->output, reply)) != 0) |
| 1079 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1079, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
| 1080 | sshbuf_free(reply); |
| 1081 | |
| 1082 | if (cc->mux_pause <= 0) |
| 1083 | fatal_f("mux_pause %d", cc->mux_pause)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1083, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "mux_pause %d", cc->mux_pause ); |
| 1084 | cc->mux_pause = 0; /* start processing messages again */ |
| 1085 | c->open_confirm_ctx = NULL((void *)0); |
| 1086 | free(cctx); |
| 1087 | } |
| 1088 | |
| 1089 | static int |
| 1090 | mux_master_process_stop_listening(struct ssh *ssh, u_int rid, |
| 1091 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
| 1092 | { |
| 1093 | debug_f("channel %d: stop listening", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1093, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: stop listening" , c->self); |
| 1094 | |
| 1095 | if (options.control_master == SSHCTL_MASTER_ASK3 || |
| 1096 | options.control_master == SSHCTL_MASTER_AUTO_ASK4) { |
| 1097 | if (!ask_permission("Disable further multiplexing on shared " |
| 1098 | "connection to %s? ", host)) { |
| 1099 | debug2_f("stop listen refused by user")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1099, 1 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "stop listen refused by user" ); |
| 1100 | reply_error(reply, MUX_S_PERMISSION_DENIED0x80000002, rid, |
| 1101 | "Permission denied"); |
| 1102 | return 0; |
| 1103 | } |
| 1104 | } |
| 1105 | |
| 1106 | if (mux_listener_channel != NULL((void *)0)) { |
| 1107 | channel_free(ssh, mux_listener_channel); |
| 1108 | client_stop_mux(); |
| 1109 | free(options.control_path); |
| 1110 | options.control_path = NULL((void *)0); |
| 1111 | mux_listener_channel = NULL((void *)0); |
| 1112 | muxserver_sock = -1; |
| 1113 | } |
| 1114 | |
| 1115 | reply_ok(reply, rid); |
| 1116 | return 0; |
| 1117 | } |
| 1118 | |
| 1119 | static int |
| 1120 | mux_master_process_proxy(struct ssh *ssh, u_int rid, |
| 1121 | Channel *c, struct sshbuf *m, struct sshbuf *reply) |
| 1122 | { |
| 1123 | int r; |
| 1124 | |
| 1125 | debug_f("channel %d: proxy request", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1125, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "channel %d: proxy request" , c->self); |
| 1126 | |
| 1127 | c->mux_rcb = channel_proxy_downstream; |
| 1128 | if ((r = sshbuf_put_u32(reply, MUX_S_PROXY0x8000000f)) != 0 || |
| 1129 | (r = sshbuf_put_u32(reply, rid)) != 0) |
| 1130 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1130, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
| 1131 | |
| 1132 | return 0; |
| 1133 | } |
| 1134 | |
| 1135 | /* Channel callbacks fired on read/write from mux client fd */ |
| 1136 | static int |
| 1137 | mux_master_read_cb(struct ssh *ssh, Channel *c) |
| 1138 | { |
| 1139 | struct mux_master_state *state = (struct mux_master_state *)c->mux_ctx; |
| 1140 | struct sshbuf *in = NULL((void *)0), *out = NULL((void *)0); |
| 1141 | u_int type, rid, i; |
| 1142 | int r, ret = -1; |
| 1143 | |
| 1144 | if ((out = sshbuf_new()) == NULL((void *)0)) |
| 1145 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1145, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 1146 | |
| 1147 | /* Setup ctx and */ |
| 1148 | if (c->mux_ctx == NULL((void *)0)) { |
| 1149 | state = xcalloc(1, sizeof(*state)); |
| 1150 | c->mux_ctx = state; |
| 1151 | channel_register_cleanup(ssh, c->self, |
| 1152 | mux_master_control_cleanup_cb, 0); |
| 1153 | |
| 1154 | /* Send hello */ |
| 1155 | if ((r = sshbuf_put_u32(out, MUX_MSG_HELLO0x00000001)) != 0 || |
| 1156 | (r = sshbuf_put_u32(out, SSHMUX_VER4)) != 0) |
| 1157 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1157, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
| 1158 | /* no extensions */ |
| 1159 | if ((r = sshbuf_put_stringb(c->output, out)) != 0) |
| 1160 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1160, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
| 1161 | debug3_f("channel %d: hello sent", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1161, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: hello sent", c->self); |
| 1162 | ret = 0; |
| 1163 | goto out; |
| 1164 | } |
| 1165 | |
| 1166 | /* Channel code ensures that we receive whole packets */ |
| 1167 | if ((r = sshbuf_froms(c->input, &in)) != 0) { |
| 1168 | malf: |
| 1169 | error_f("malformed message")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1169, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "malformed message"); |
| 1170 | goto out; |
| 1171 | } |
| 1172 | |
| 1173 | if ((r = sshbuf_get_u32(in, &type)) != 0) |
| 1174 | goto malf; |
| 1175 | debug3_f("channel %d packet type 0x%08x len %zu", c->self,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1176, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d packet type 0x%08x len %zu" , c->self, type, sshbuf_len(in)) |
| 1176 | type, sshbuf_len(in))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1176, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d packet type 0x%08x len %zu" , c->self, type, sshbuf_len(in)); |
| 1177 | |
| 1178 | if (type == MUX_MSG_HELLO0x00000001) |
| 1179 | rid = 0; |
| 1180 | else { |
| 1181 | if (!state->hello_rcvd) { |
| 1182 | error_f("expected MUX_MSG_HELLO(0x%08x), "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1183, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "expected MUX_MSG_HELLO(0x%08x), " "received 0x%08x", 0x00000001, type) |
| 1183 | "received 0x%08x", MUX_MSG_HELLO, type)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1183, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "expected MUX_MSG_HELLO(0x%08x), " "received 0x%08x", 0x00000001, type); |
| 1184 | goto out; |
| 1185 | } |
| 1186 | if ((r = sshbuf_get_u32(in, &rid)) != 0) |
| 1187 | goto malf; |
| 1188 | } |
| 1189 | |
| 1190 | for (i = 0; mux_master_handlers[i].handler != NULL((void *)0); i++) { |
| 1191 | if (type == mux_master_handlers[i].type) { |
| 1192 | ret = mux_master_handlers[i].handler(ssh, rid, |
| 1193 | c, in, out); |
| 1194 | break; |
| 1195 | } |
| 1196 | } |
| 1197 | if (mux_master_handlers[i].handler == NULL((void *)0)) { |
| 1198 | error_f("unsupported mux message 0x%08x", type)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1198, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "unsupported mux message 0x%08x" , type); |
| 1199 | reply_error(out, MUX_S_FAILURE0x80000003, rid, "unsupported request"); |
| 1200 | ret = 0; |
| 1201 | } |
| 1202 | /* Enqueue reply packet */ |
| 1203 | if (sshbuf_len(out) != 0 && |
| 1204 | (r = sshbuf_put_stringb(c->output, out)) != 0) |
| 1205 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1205, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
| 1206 | out: |
| 1207 | sshbuf_free(in); |
| 1208 | sshbuf_free(out); |
| 1209 | return ret; |
| 1210 | } |
| 1211 | |
| 1212 | void |
| 1213 | mux_exit_message(struct ssh *ssh, Channel *c, int exitval) |
| 1214 | { |
| 1215 | struct sshbuf *m; |
| 1216 | Channel *mux_chan; |
| 1217 | int r; |
| 1218 | |
| 1219 | debug3_f("channel %d: exit message, exitval %d", c->self, exitval)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1219, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: exit message, exitval %d" , c->self, exitval); |
| 1220 | |
| 1221 | if ((mux_chan = channel_by_id(ssh, c->ctl_chan)) == NULL((void *)0)) |
| 1222 | fatal_f("channel %d missing mux %d", c->self, c->ctl_chan)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1222, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d missing mux %d" , c->self, c->ctl_chan); |
| 1223 | |
| 1224 | /* Append exit message packet to control socket output queue */ |
| 1225 | if ((m = sshbuf_new()) == NULL((void *)0)) |
| 1226 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1226, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 1227 | if ((r = sshbuf_put_u32(m, MUX_S_EXIT_MESSAGE0x80000004)) != 0 || |
| 1228 | (r = sshbuf_put_u32(m, c->self)) != 0 || |
| 1229 | (r = sshbuf_put_u32(m, exitval)) != 0 || |
| 1230 | (r = sshbuf_put_stringb(mux_chan->output, m)) != 0) |
| 1231 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1231, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
| 1232 | sshbuf_free(m); |
| 1233 | } |
| 1234 | |
| 1235 | void |
| 1236 | mux_tty_alloc_failed(struct ssh *ssh, Channel *c) |
| 1237 | { |
| 1238 | struct sshbuf *m; |
| 1239 | Channel *mux_chan; |
| 1240 | int r; |
| 1241 | |
| 1242 | debug3_f("channel %d: TTY alloc failed", c->self)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1242, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "channel %d: TTY alloc failed" , c->self); |
| 1243 | |
| 1244 | if ((mux_chan = channel_by_id(ssh, c->ctl_chan)) == NULL((void *)0)) |
| 1245 | fatal_f("channel %d missing mux %d", c->self, c->ctl_chan)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1245, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d missing mux %d" , c->self, c->ctl_chan); |
| 1246 | |
| 1247 | /* Append exit message packet to control socket output queue */ |
| 1248 | if ((m = sshbuf_new()) == NULL((void *)0)) |
| 1249 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1249, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 1250 | if ((r = sshbuf_put_u32(m, MUX_S_TTY_ALLOC_FAIL0x80000008)) != 0 || |
| 1251 | (r = sshbuf_put_u32(m, c->self)) != 0 || |
| 1252 | (r = sshbuf_put_stringb(mux_chan->output, m)) != 0) |
| 1253 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1253, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
| 1254 | sshbuf_free(m); |
| 1255 | } |
| 1256 | |
| 1257 | /* Prepare a mux master to listen on a Unix domain socket. */ |
| 1258 | void |
| 1259 | muxserver_listen(struct ssh *ssh) |
| 1260 | { |
| 1261 | mode_t old_umask; |
| 1262 | char *orig_control_path = options.control_path; |
| 1263 | char rbuf[16+1]; |
| 1264 | u_int i, r; |
| 1265 | int oerrno; |
| 1266 | |
| 1267 | if (options.control_path == NULL((void *)0) || |
| 1268 | options.control_master == SSHCTL_MASTER_NO0) |
| 1269 | return; |
| 1270 | |
| 1271 | debug("setting up multiplex master socket")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1271, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "setting up multiplex master socket" ); |
| 1272 | |
| 1273 | /* |
| 1274 | * Use a temporary path before listen so we can pseudo-atomically |
| 1275 | * establish the listening socket in its final location to avoid |
| 1276 | * other processes racing in between bind() and listen() and hitting |
| 1277 | * an unready socket. |
| 1278 | */ |
| 1279 | for (i = 0; i < sizeof(rbuf) - 1; i++) { |
| 1280 | r = arc4random_uniform(26+26+10); |
| 1281 | rbuf[i] = (r < 26) ? 'a' + r : |
| 1282 | (r < 26*2) ? 'A' + r - 26 : |
| 1283 | '0' + r - 26 - 26; |
| 1284 | } |
| 1285 | rbuf[sizeof(rbuf) - 1] = '\0'; |
| 1286 | options.control_path = NULL((void *)0); |
| 1287 | xasprintf(&options.control_path, "%s.%s", orig_control_path, rbuf); |
| 1288 | debug3_f("temporary control path %s", options.control_path)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1288, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "temporary control path %s" , options.control_path); |
| 1289 | |
| 1290 | old_umask = umask(0177); |
| 1291 | muxserver_sock = unix_listener(options.control_path, 64, 0); |
| 1292 | oerrno = errno(*__errno()); |
| 1293 | umask(old_umask); |
| 1294 | if (muxserver_sock < 0) { |
| 1295 | if (oerrno == EINVAL22 || oerrno == EADDRINUSE48) { |
| 1296 | error("ControlSocket %s already exists, "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1297, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "ControlSocket %s already exists, " "disabling multiplexing", options.control_path) |
| 1297 | "disabling multiplexing", options.control_path)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1297, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "ControlSocket %s already exists, " "disabling multiplexing", options.control_path); |
| 1298 | disable_mux_master: |
| 1299 | if (muxserver_sock != -1) { |
| 1300 | close(muxserver_sock); |
| 1301 | muxserver_sock = -1; |
| 1302 | } |
| 1303 | free(orig_control_path); |
| 1304 | free(options.control_path); |
| 1305 | options.control_path = NULL((void *)0); |
| 1306 | options.control_master = SSHCTL_MASTER_NO0; |
| 1307 | return; |
| 1308 | } else { |
| 1309 | /* unix_listener() logs the error */ |
| 1310 | cleanup_exit(255); |
| 1311 | } |
| 1312 | } |
| 1313 | |
| 1314 | /* Now atomically "move" the mux socket into position */ |
| 1315 | if (link(options.control_path, orig_control_path) != 0) { |
| 1316 | if (errno(*__errno()) != EEXIST17) { |
| 1317 | fatal_f("link mux listener %s => %s: %s",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1319, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "link mux listener %s => %s: %s" , options.control_path, orig_control_path, strerror((*__errno ()))) |
| 1318 | options.control_path, orig_control_path,sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1319, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "link mux listener %s => %s: %s" , options.control_path, orig_control_path, strerror((*__errno ()))) |
| 1319 | strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1319, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "link mux listener %s => %s: %s" , options.control_path, orig_control_path, strerror((*__errno ()))); |
| 1320 | } |
| 1321 | error("ControlSocket %s already exists, disabling multiplexing",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1322, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "ControlSocket %s already exists, disabling multiplexing" , orig_control_path) |
| 1322 | orig_control_path)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1322, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "ControlSocket %s already exists, disabling multiplexing" , orig_control_path); |
| 1323 | unlink(options.control_path); |
| 1324 | goto disable_mux_master; |
| 1325 | } |
| 1326 | unlink(options.control_path); |
| 1327 | free(options.control_path); |
| 1328 | options.control_path = orig_control_path; |
| 1329 | |
| 1330 | set_nonblock(muxserver_sock); |
| 1331 | |
| 1332 | mux_listener_channel = channel_new(ssh, "mux listener", |
| 1333 | SSH_CHANNEL_MUX_LISTENER15, muxserver_sock, muxserver_sock, -1, |
| 1334 | CHAN_TCP_WINDOW_DEFAULT(64*(32*1024)), CHAN_TCP_PACKET_DEFAULT(32*1024), |
| 1335 | 0, options.control_path, 1); |
| 1336 | mux_listener_channel->mux_rcb = mux_master_read_cb; |
| 1337 | debug3_f("mux listener channel %d fd %d",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1338, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "mux listener channel %d fd %d" , mux_listener_channel->self, mux_listener_channel->sock ) |
| 1338 | mux_listener_channel->self, mux_listener_channel->sock)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1338, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "mux listener channel %d fd %d" , mux_listener_channel->self, mux_listener_channel->sock ); |
| 1339 | } |
| 1340 | |
| 1341 | /* Callback on open confirmation in mux master for a mux client session. */ |
| 1342 | static void |
| 1343 | mux_session_confirm(struct ssh *ssh, int id, int success, void *arg) |
| 1344 | { |
| 1345 | struct mux_session_confirm_ctx *cctx = arg; |
| 1346 | const char *display; |
| 1347 | Channel *c, *cc; |
| 1348 | int i, r; |
| 1349 | struct sshbuf *reply; |
| 1350 | |
| 1351 | if (cctx == NULL((void *)0)) |
| 1352 | fatal_f("cctx == NULL")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1352, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "cctx == NULL"); |
| 1353 | if ((c = channel_by_id(ssh, id)) == NULL((void *)0)) |
| 1354 | fatal_f("no channel for id %d", id)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1354, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "no channel for id %d", id ); |
| 1355 | if ((cc = channel_by_id(ssh, c->ctl_chan)) == NULL((void *)0)) |
| 1356 | fatal_f("channel %d lacks control channel %d",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1357, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d lacks control channel %d" , id, c->ctl_chan) |
| 1357 | id, c->ctl_chan)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1357, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "channel %d lacks control channel %d" , id, c->ctl_chan); |
| 1358 | if ((reply = sshbuf_new()) == NULL((void *)0)) |
| 1359 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1359, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 1360 | |
| 1361 | if (!success) { |
| 1362 | debug3_f("sending failure reply")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1362, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "sending failure reply"); |
| 1363 | reply_error(reply, MUX_S_FAILURE0x80000003, cctx->rid, |
| 1364 | "Session open refused by peer"); |
| 1365 | goto done; |
| 1366 | } |
| 1367 | |
| 1368 | display = getenv("DISPLAY"); |
| 1369 | if (cctx->want_x_fwd && options.forward_x11 && display != NULL((void *)0)) { |
| 1370 | char *proto, *data; |
| 1371 | |
| 1372 | /* Get reasonable local authentication information. */ |
| 1373 | if (client_x11_get_proto(ssh, display, options.xauth_location, |
| 1374 | options.forward_x11_trusted, options.forward_x11_timeout, |
| 1375 | &proto, &data) == 0) { |
| 1376 | /* Request forwarding with authentication spoofing. */ |
| 1377 | debug("Requesting X11 forwarding with authentication "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1378, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "Requesting X11 forwarding with authentication " "spoofing.") |
| 1378 | "spoofing.")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1378, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "Requesting X11 forwarding with authentication " "spoofing."); |
| 1379 | x11_request_forwarding_with_spoofing(ssh, id, |
| 1380 | display, proto, data, 1); |
| 1381 | /* XXX exit_on_forward_failure */ |
| 1382 | client_expect_confirm(ssh, id, "X11 forwarding", |
| 1383 | CONFIRM_WARN); |
| 1384 | } |
| 1385 | } |
| 1386 | |
| 1387 | if (cctx->want_agent_fwd && options.forward_agent) { |
| 1388 | debug("Requesting authentication agent forwarding.")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1388, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "Requesting authentication agent forwarding." ); |
| 1389 | channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0); |
| 1390 | if ((r = sshpkt_send(ssh)) != 0) |
| 1391 | fatal_fr(r, "send")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1391, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send"); |
| 1392 | } |
| 1393 | |
| 1394 | client_session2_setup(ssh, id, cctx->want_tty, cctx->want_subsys, |
| 1395 | cctx->term, &cctx->tio, c->rfd, cctx->cmd, cctx->env); |
| 1396 | |
| 1397 | debug3_f("sending success reply")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1397, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "sending success reply"); |
| 1398 | /* prepare reply */ |
| 1399 | if ((r = sshbuf_put_u32(reply, MUX_S_SESSION_OPENED0x80000006)) != 0 || |
| 1400 | (r = sshbuf_put_u32(reply, cctx->rid)) != 0 || |
| 1401 | (r = sshbuf_put_u32(reply, c->self)) != 0) |
| 1402 | fatal_fr(r, "reply")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1402, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reply"); |
| 1403 | |
| 1404 | done: |
| 1405 | /* Send reply */ |
| 1406 | if ((r = sshbuf_put_stringb(cc->output, reply)) != 0) |
| 1407 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1407, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
| 1408 | sshbuf_free(reply); |
| 1409 | |
| 1410 | if (cc->mux_pause <= 0) |
| 1411 | fatal_f("mux_pause %d", cc->mux_pause)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1411, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "mux_pause %d", cc->mux_pause ); |
| 1412 | cc->mux_pause = 0; /* start processing messages again */ |
| 1413 | c->open_confirm_ctx = NULL((void *)0); |
| 1414 | sshbuf_free(cctx->cmd); |
| 1415 | free(cctx->term); |
| 1416 | if (cctx->env != NULL((void *)0)) { |
| 1417 | for (i = 0; cctx->env[i] != NULL((void *)0); i++) |
| 1418 | free(cctx->env[i]); |
| 1419 | free(cctx->env); |
| 1420 | } |
| 1421 | free(cctx); |
| 1422 | } |
| 1423 | |
| 1424 | /* ** Multiplexing client support */ |
| 1425 | |
| 1426 | /* Exit signal handler */ |
| 1427 | static void |
| 1428 | control_client_sighandler(int signo) |
| 1429 | { |
| 1430 | muxclient_terminate = signo; |
| 1431 | } |
| 1432 | |
| 1433 | /* |
| 1434 | * Relay signal handler - used to pass some signals from mux client to |
| 1435 | * mux master. |
| 1436 | */ |
| 1437 | static void |
| 1438 | control_client_sigrelay(int signo) |
| 1439 | { |
| 1440 | int save_errno = errno(*__errno()); |
| 1441 | |
| 1442 | if (muxserver_pid > 1) |
| 1443 | kill(muxserver_pid, signo); |
| 1444 | |
| 1445 | errno(*__errno()) = save_errno; |
| 1446 | } |
| 1447 | |
| 1448 | static int |
| 1449 | mux_client_read(int fd, struct sshbuf *b, size_t need, int timeout_ms) |
| 1450 | { |
| 1451 | size_t have; |
| 1452 | ssize_t len; |
| 1453 | u_char *p; |
| 1454 | int r; |
| 1455 | |
| 1456 | if ((r = sshbuf_reserve(b, need, &p)) != 0) |
| 1457 | fatal_fr(r, "reserve")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1457, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "reserve"); |
| 1458 | for (have = 0; have < need; ) { |
| 1459 | if (muxclient_terminate) { |
| 1460 | errno(*__errno()) = EINTR4; |
| 1461 | return -1; |
| 1462 | } |
| 1463 | len = read(fd, p + have, need - have); |
| 1464 | if (len == -1) { |
| 1465 | switch (errno(*__errno())) { |
| 1466 | case EAGAIN35: |
| 1467 | if (waitrfd(fd, &timeout_ms, |
| 1468 | &muxclient_terminate) == -1 && |
| 1469 | errno(*__errno()) != EINTR4) |
| 1470 | return -1; /* timeout */ |
| 1471 | /* FALLTHROUGH */ |
| 1472 | case EINTR4: |
| 1473 | continue; |
| 1474 | default: |
| 1475 | return -1; |
| 1476 | } |
| 1477 | } |
| 1478 | if (len == 0) { |
| 1479 | errno(*__errno()) = EPIPE32; |
| 1480 | return -1; |
| 1481 | } |
| 1482 | have += (size_t)len; |
| 1483 | } |
| 1484 | return 0; |
| 1485 | } |
| 1486 | |
| 1487 | static int |
| 1488 | mux_client_write_packet(int fd, struct sshbuf *m) |
| 1489 | { |
| 1490 | struct sshbuf *queue; |
| 1491 | u_int have, need; |
| 1492 | int r, oerrno, len; |
| 1493 | const u_char *ptr; |
| 1494 | struct pollfd pfd; |
| 1495 | |
| 1496 | pfd.fd = fd; |
| 1497 | pfd.events = POLLOUT0x0004; |
| 1498 | if ((queue = sshbuf_new()) == NULL((void *)0)) |
| 1499 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1499, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 1500 | if ((r = sshbuf_put_stringb(queue, m)) != 0) |
| 1501 | fatal_fr(r, "enqueue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1501, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue"); |
| 1502 | |
| 1503 | need = sshbuf_len(queue); |
| 1504 | ptr = sshbuf_ptr(queue); |
| 1505 | |
| 1506 | for (have = 0; have < need; ) { |
| 1507 | if (muxclient_terminate) { |
| 1508 | sshbuf_free(queue); |
| 1509 | errno(*__errno()) = EINTR4; |
| 1510 | return -1; |
| 1511 | } |
| 1512 | len = write(fd, ptr + have, need - have); |
| 1513 | if (len == -1) { |
| 1514 | switch (errno(*__errno())) { |
| 1515 | case EAGAIN35: |
| 1516 | (void)poll(&pfd, 1, -1); |
| 1517 | /* FALLTHROUGH */ |
| 1518 | case EINTR4: |
| 1519 | continue; |
| 1520 | default: |
| 1521 | oerrno = errno(*__errno()); |
| 1522 | sshbuf_free(queue); |
| 1523 | errno(*__errno()) = oerrno; |
| 1524 | return -1; |
| 1525 | } |
| 1526 | } |
| 1527 | if (len == 0) { |
| 1528 | sshbuf_free(queue); |
| 1529 | errno(*__errno()) = EPIPE32; |
| 1530 | return -1; |
| 1531 | } |
| 1532 | have += (u_int)len; |
| 1533 | } |
| 1534 | sshbuf_free(queue); |
| 1535 | return 0; |
| 1536 | } |
| 1537 | |
| 1538 | static int |
| 1539 | mux_client_read_packet_timeout(int fd, struct sshbuf *m, int timeout_ms) |
| 1540 | { |
| 1541 | struct sshbuf *queue; |
| 1542 | size_t need, have; |
| 1543 | const u_char *ptr; |
| 1544 | int r, oerrno; |
| 1545 | |
| 1546 | if ((queue = sshbuf_new()) == NULL((void *)0)) |
| 1547 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1547, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 1548 | if (mux_client_read(fd, queue, 4, timeout_ms) != 0) { |
| 1549 | if ((oerrno = errno(*__errno())) == EPIPE32) |
| 1550 | debug3_f("read header failed: %s",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1551, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "read header failed: %s", strerror((*__errno()))) |
| 1551 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1551, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "read header failed: %s", strerror((*__errno()))); |
| 1552 | sshbuf_free(queue); |
| 1553 | errno(*__errno()) = oerrno; |
| 1554 | return -1; |
| 1555 | } |
| 1556 | 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])); |
| 1557 | if (mux_client_read(fd, queue, need, timeout_ms) != 0) { |
| 1558 | oerrno = errno(*__errno()); |
| 1559 | debug3_f("read body failed: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1559, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "read body failed: %s", strerror ((*__errno()))); |
| 1560 | sshbuf_free(queue); |
| 1561 | errno(*__errno()) = oerrno; |
| 1562 | return -1; |
| 1563 | } |
| 1564 | if ((r = sshbuf_get_string_direct(queue, &ptr, &have)) != 0 || |
| 1565 | (r = sshbuf_put(m, ptr, have)) != 0) |
| 1566 | fatal_fr(r, "dequeue")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1566, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "dequeue"); |
| 1567 | sshbuf_free(queue); |
| 1568 | return 0; |
| 1569 | } |
| 1570 | |
| 1571 | static int |
| 1572 | mux_client_read_packet(int fd, struct sshbuf *m) |
| 1573 | { |
| 1574 | return mux_client_read_packet_timeout(fd, m, -1); |
| 1575 | } |
| 1576 | |
| 1577 | static int |
| 1578 | mux_client_hello_exchange(int fd, int timeout_ms) |
| 1579 | { |
| 1580 | struct sshbuf *m; |
| 1581 | u_int type, ver; |
| 1582 | int r, ret = -1; |
| 1583 | |
| 1584 | if ((m = sshbuf_new()) == NULL((void *)0)) |
| 1585 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1585, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 1586 | if ((r = sshbuf_put_u32(m, MUX_MSG_HELLO0x00000001)) != 0 || |
| 1587 | (r = sshbuf_put_u32(m, SSHMUX_VER4)) != 0) |
| 1588 | fatal_fr(r, "assemble hello")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1588, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "assemble hello"); |
| 1589 | /* no extensions */ |
| 1590 | |
| 1591 | if (mux_client_write_packet(fd, m) != 0) { |
| 1592 | debug_f("write packet: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1592, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "write packet: %s", strerror ((*__errno()))); |
| 1593 | goto out; |
| 1594 | } |
| 1595 | |
| 1596 | sshbuf_reset(m); |
| 1597 | |
| 1598 | /* Read their HELLO */ |
| 1599 | if (mux_client_read_packet_timeout(fd, m, timeout_ms) != 0) { |
| 1600 | debug_f("read packet failed")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1600, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "read packet failed"); |
| 1601 | goto out; |
| 1602 | } |
| 1603 | |
| 1604 | if ((r = sshbuf_get_u32(m, &type)) != 0) |
| 1605 | fatal_fr(r, "parse type")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1605, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse type"); |
| 1606 | if (type != MUX_MSG_HELLO0x00000001) { |
| 1607 | error_f("expected HELLO (%u) got %u", MUX_MSG_HELLO, type)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1607, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "expected HELLO (%u) got %u" , 0x00000001, type); |
| 1608 | goto out; |
| 1609 | } |
| 1610 | if ((r = sshbuf_get_u32(m, &ver)) != 0) |
| 1611 | fatal_fr(r, "parse version")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1611, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse version"); |
| 1612 | if (ver != SSHMUX_VER4) { |
| 1613 | error("Unsupported multiplexing protocol version %d "sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1614, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Unsupported multiplexing protocol version %d " "(expected %d)", ver, 4) |
| 1614 | "(expected %d)", ver, SSHMUX_VER)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1614, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Unsupported multiplexing protocol version %d " "(expected %d)", ver, 4); |
| 1615 | goto out; |
| 1616 | } |
| 1617 | debug2_f("master version %u", ver)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1617, 1 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "master version %u", ver); |
| 1618 | /* No extensions are presently defined */ |
| 1619 | while (sshbuf_len(m) > 0) { |
| 1620 | char *name = NULL((void *)0); |
| 1621 | |
| 1622 | if ((r = sshbuf_get_cstring(m, &name, NULL((void *)0))) != 0 || |
| 1623 | (r = sshbuf_skip_string(m)sshbuf_get_string_direct(m, ((void *)0), ((void *)0))) != 0) { /* value */ |
| 1624 | error_fr(r, "parse extension")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1624, 1 , SYSLOG_LEVEL_ERROR, ssh_err(r), "parse extension"); |
| 1625 | goto out; |
| 1626 | } |
| 1627 | debug2("Unrecognised master extension \"%s\"", name)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1627, 0 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "Unrecognised master extension \"%s\"" , name); |
| 1628 | free(name); |
| 1629 | } |
| 1630 | /* success */ |
| 1631 | ret = 0; |
| 1632 | out: |
| 1633 | sshbuf_free(m); |
| 1634 | return ret; |
| 1635 | } |
| 1636 | |
| 1637 | static u_int |
| 1638 | mux_client_request_alive(int fd) |
| 1639 | { |
| 1640 | struct sshbuf *m; |
| 1641 | char *e; |
| 1642 | u_int pid, type, rid; |
| 1643 | int r; |
| 1644 | |
| 1645 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1645, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "entering"); |
| 1646 | |
| 1647 | if ((m = sshbuf_new()) == NULL((void *)0)) |
| 1648 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1648, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 1649 | if ((r = sshbuf_put_u32(m, MUX_C_ALIVE_CHECK0x10000004)) != 0 || |
| 1650 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0) |
| 1651 | fatal_fr(r, "assemble")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1651, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "assemble"); |
| 1652 | |
| 1653 | if (mux_client_write_packet(fd, m) != 0) |
| 1654 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1654, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "write packet: %s", strerror ((*__errno()))); |
| 1655 | |
| 1656 | sshbuf_reset(m); |
| 1657 | |
| 1658 | /* Read their reply */ |
| 1659 | if (mux_client_read_packet(fd, m) != 0) { |
| 1660 | sshbuf_free(m); |
| 1661 | return 0; |
| 1662 | } |
| 1663 | |
| 1664 | if ((r = sshbuf_get_u32(m, &type)) != 0) |
| 1665 | fatal_fr(r, "parse type")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1665, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse type"); |
| 1666 | if (type != MUX_S_ALIVE0x80000005) { |
| 1667 | if ((r = sshbuf_get_cstring(m, &e, NULL((void *)0))) != 0) |
| 1668 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1668, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
| 1669 | fatal_f("master returned error: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1669, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "master returned error: %s" , e); |
| 1670 | } |
| 1671 | |
| 1672 | if ((r = sshbuf_get_u32(m, &rid)) != 0) |
| 1673 | fatal_fr(r, "parse remote ID")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1673, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse remote ID"); |
| 1674 | if (rid != muxclient_request_id) |
| 1675 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1676, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
| 1676 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1676, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
| 1677 | if ((r = sshbuf_get_u32(m, &pid)) != 0) |
| 1678 | fatal_fr(r, "parse PID")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1678, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse PID"); |
| 1679 | sshbuf_free(m); |
| 1680 | |
| 1681 | debug3_f("done pid = %u", pid)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1681, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "done pid = %u", pid); |
| 1682 | |
| 1683 | muxclient_request_id++; |
| 1684 | |
| 1685 | return pid; |
| 1686 | } |
| 1687 | |
| 1688 | static void |
| 1689 | mux_client_request_terminate(int fd) |
| 1690 | { |
| 1691 | struct sshbuf *m; |
| 1692 | char *e; |
| 1693 | u_int type, rid; |
| 1694 | int r; |
| 1695 | |
| 1696 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1696, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "entering"); |
| 1697 | |
| 1698 | if ((m = sshbuf_new()) == NULL((void *)0)) |
| 1699 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1699, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 1700 | if ((r = sshbuf_put_u32(m, MUX_C_TERMINATE0x10000005)) != 0 || |
| 1701 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0) |
| 1702 | fatal_fr(r, "request")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1702, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request"); |
| 1703 | |
| 1704 | if (mux_client_write_packet(fd, m) != 0) |
| 1705 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1705, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "write packet: %s", strerror ((*__errno()))); |
| 1706 | |
| 1707 | sshbuf_reset(m); |
| 1708 | |
| 1709 | /* Read their reply */ |
| 1710 | if (mux_client_read_packet(fd, m) != 0) { |
| 1711 | /* Remote end exited already */ |
| 1712 | if (errno(*__errno()) == EPIPE32) { |
| 1713 | sshbuf_free(m); |
| 1714 | return; |
| 1715 | } |
| 1716 | fatal_f("read from master failed: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1716, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "read from master failed: %s" , strerror((*__errno()))); |
| 1717 | } |
| 1718 | |
| 1719 | if ((r = sshbuf_get_u32(m, &type)) != 0 || |
| 1720 | (r = sshbuf_get_u32(m, &rid)) != 0) |
| 1721 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1721, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
| 1722 | if (rid != muxclient_request_id) |
| 1723 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1724, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
| 1724 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1724, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
| 1725 | switch (type) { |
| 1726 | case MUX_S_OK0x80000001: |
| 1727 | break; |
| 1728 | case MUX_S_PERMISSION_DENIED0x80000002: |
| 1729 | if ((r = sshbuf_get_cstring(m, &e, NULL((void *)0))) != 0) |
| 1730 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1730, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
| 1731 | fatal("Master refused termination request: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1731, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Master refused termination request: %s" , e); |
| 1732 | case MUX_S_FAILURE0x80000003: |
| 1733 | if ((r = sshbuf_get_cstring(m, &e, NULL((void *)0))) != 0) |
| 1734 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1734, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
| 1735 | fatal_f("termination request failed: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1735, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "termination request failed: %s" , e); |
| 1736 | default: |
| 1737 | fatal_f("unexpected response from master 0x%08x", type)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1737, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "unexpected response from master 0x%08x" , type); |
| 1738 | } |
| 1739 | sshbuf_free(m); |
| 1740 | muxclient_request_id++; |
| 1741 | } |
| 1742 | |
| 1743 | static int |
| 1744 | mux_client_forward(int fd, int cancel_flag, u_int ftype, struct Forward *fwd) |
| 1745 | { |
| 1746 | struct sshbuf *m; |
| 1747 | char *e, *fwd_desc; |
| 1748 | const char *lhost, *chost; |
| 1749 | u_int type, rid; |
| 1750 | int r; |
| 1751 | |
| 1752 | fwd_desc = format_forward(ftype, fwd); |
| 1753 | debug("Requesting %s %s",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1754, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "Requesting %s %s", cancel_flag ? "cancellation of" : "forwarding of", fwd_desc) |
| 1754 | cancel_flag ? "cancellation of" : "forwarding of", fwd_desc)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1754, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "Requesting %s %s", cancel_flag ? "cancellation of" : "forwarding of", fwd_desc); |
| 1755 | free(fwd_desc); |
| 1756 | |
| 1757 | type = cancel_flag ? MUX_C_CLOSE_FWD0x10000007 : MUX_C_OPEN_FWD0x10000006; |
| 1758 | if (fwd->listen_path != NULL((void *)0)) |
| 1759 | lhost = fwd->listen_path; |
| 1760 | else if (fwd->listen_host == NULL((void *)0)) |
| 1761 | lhost = ""; |
| 1762 | else if (*fwd->listen_host == '\0') |
| 1763 | lhost = "*"; |
| 1764 | else |
| 1765 | lhost = fwd->listen_host; |
| 1766 | |
| 1767 | if (fwd->connect_path != NULL((void *)0)) |
| 1768 | chost = fwd->connect_path; |
| 1769 | else if (fwd->connect_host == NULL((void *)0)) |
| 1770 | chost = ""; |
| 1771 | else |
| 1772 | chost = fwd->connect_host; |
| 1773 | |
| 1774 | if ((m = sshbuf_new()) == NULL((void *)0)) |
| 1775 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1775, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 1776 | if ((r = sshbuf_put_u32(m, type)) != 0 || |
| 1777 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0 || |
| 1778 | (r = sshbuf_put_u32(m, ftype)) != 0 || |
| 1779 | (r = sshbuf_put_cstring(m, lhost)) != 0 || |
| 1780 | (r = sshbuf_put_u32(m, fwd->listen_port)) != 0 || |
| 1781 | (r = sshbuf_put_cstring(m, chost)) != 0 || |
| 1782 | (r = sshbuf_put_u32(m, fwd->connect_port)) != 0) |
| 1783 | fatal_fr(r, "request")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1783, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request"); |
| 1784 | |
| 1785 | if (mux_client_write_packet(fd, m) != 0) |
| 1786 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1786, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "write packet: %s", strerror ((*__errno()))); |
| 1787 | |
| 1788 | sshbuf_reset(m); |
| 1789 | |
| 1790 | /* Read their reply */ |
| 1791 | if (mux_client_read_packet(fd, m) != 0) { |
| 1792 | sshbuf_free(m); |
| 1793 | return -1; |
| 1794 | } |
| 1795 | |
| 1796 | if ((r = sshbuf_get_u32(m, &type)) != 0 || |
| 1797 | (r = sshbuf_get_u32(m, &rid)) != 0) |
| 1798 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1798, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
| 1799 | if (rid != muxclient_request_id) |
| 1800 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1801, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
| 1801 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1801, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
| 1802 | |
| 1803 | switch (type) { |
| 1804 | case MUX_S_OK0x80000001: |
| 1805 | break; |
| 1806 | case MUX_S_REMOTE_PORT0x80000007: |
| 1807 | if (cancel_flag) |
| 1808 | fatal_f("got MUX_S_REMOTE_PORT for cancel")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1808, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "got MUX_S_REMOTE_PORT for cancel" ); |
| 1809 | if ((r = sshbuf_get_u32(m, &fwd->allocated_port)) != 0) |
| 1810 | fatal_fr(r, "parse port")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1810, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse port"); |
| 1811 | verbose("Allocated port %u for remote forward to %s:%d",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1814, 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) |
| 1812 | fwd->allocated_port,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1814, 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) |
| 1813 | fwd->connect_host ? fwd->connect_host : "",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1814, 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) |
| 1814 | fwd->connect_port)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1814, 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); |
| 1815 | if (muxclient_command == SSHMUX_COMMAND_FORWARD5) |
| 1816 | fprintf(stdout(&__sF[1]), "%i\n", fwd->allocated_port); |
| 1817 | break; |
| 1818 | case MUX_S_PERMISSION_DENIED0x80000002: |
| 1819 | if ((r = sshbuf_get_cstring(m, &e, NULL((void *)0))) != 0) |
| 1820 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1820, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
| 1821 | sshbuf_free(m); |
| 1822 | error("Master refused forwarding request: %s", e)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1822, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Master refused forwarding request: %s" , e); |
| 1823 | return -1; |
| 1824 | case MUX_S_FAILURE0x80000003: |
| 1825 | if ((r = sshbuf_get_cstring(m, &e, NULL((void *)0))) != 0) |
| 1826 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1826, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
| 1827 | sshbuf_free(m); |
| 1828 | error_f("forwarding request failed: %s", e)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1828, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "forwarding request failed: %s" , e); |
| 1829 | return -1; |
| 1830 | default: |
| 1831 | fatal_f("unexpected response from master 0x%08x", type)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1831, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "unexpected response from master 0x%08x" , type); |
| 1832 | } |
| 1833 | sshbuf_free(m); |
| 1834 | |
| 1835 | muxclient_request_id++; |
| 1836 | return 0; |
| 1837 | } |
| 1838 | |
| 1839 | static int |
| 1840 | mux_client_forwards(int fd, int cancel_flag) |
| 1841 | { |
| 1842 | int i, ret = 0; |
| 1843 | |
| 1844 | debug3_f("%s forwardings: %d local, %d remote",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1846, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s forwardings: %d local, %d remote" , cancel_flag ? "cancel" : "request", options.num_local_forwards , options.num_remote_forwards) |
| 1845 | cancel_flag ? "cancel" : "request",sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1846, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s forwardings: %d local, %d remote" , cancel_flag ? "cancel" : "request", options.num_local_forwards , options.num_remote_forwards) |
| 1846 | options.num_local_forwards, options.num_remote_forwards)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1846, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "%s forwardings: %d local, %d remote" , cancel_flag ? "cancel" : "request", options.num_local_forwards , options.num_remote_forwards); |
| 1847 | |
| 1848 | /* XXX ExitOnForwardingFailure */ |
| 1849 | for (i = 0; i < options.num_local_forwards; i++) { |
| 1850 | if (mux_client_forward(fd, cancel_flag, |
| 1851 | options.local_forwards[i].connect_port == 0 ? |
| 1852 | MUX_FWD_DYNAMIC3 : MUX_FWD_LOCAL1, |
| 1853 | options.local_forwards + i) != 0) |
| 1854 | ret = -1; |
| 1855 | } |
| 1856 | for (i = 0; i < options.num_remote_forwards; i++) { |
| 1857 | if (mux_client_forward(fd, cancel_flag, MUX_FWD_REMOTE2, |
| 1858 | options.remote_forwards + i) != 0) |
| 1859 | ret = -1; |
| 1860 | } |
| 1861 | return ret; |
| 1862 | } |
| 1863 | |
| 1864 | static int |
| 1865 | mux_client_request_session(int fd) |
| 1866 | { |
| 1867 | struct sshbuf *m; |
| 1868 | char *e; |
| 1869 | const char *term = NULL((void *)0); |
| 1870 | u_int i, echar, rid, sid, esid, exitval, type, exitval_seen; |
| 1871 | extern char **environ; |
| 1872 | int r, rawmode = 0; |
| 1873 | |
| 1874 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1874, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "entering"); |
| 1875 | |
| 1876 | if ((muxserver_pid = mux_client_request_alive(fd)) == 0) { |
| 1877 | error_f("master alive request failed")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1877, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "master alive request failed" ); |
| 1878 | return -1; |
| 1879 | } |
| 1880 | |
| 1881 | ssh_signal(SIGPIPE13, SIG_IGN(void (*)(int))1); |
| 1882 | |
| 1883 | if (options.stdin_null && stdfd_devnull(1, 0, 0) == -1) |
| 1884 | fatal_f("stdfd_devnull failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1884, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "stdfd_devnull failed"); |
| 1885 | |
| 1886 | if ((term = lookup_env_in_list("TERM", options.setenv, |
| 1887 | options.num_setenv)) == NULL((void *)0) || *term == '\0') |
| 1888 | term = getenv("TERM"); |
| 1889 | |
| 1890 | echar = 0xffffffff; |
| 1891 | if (options.escape_char != SSH_ESCAPECHAR_NONE-2) |
| 1892 | echar = (u_int)options.escape_char; |
| 1893 | |
| 1894 | if ((m = sshbuf_new()) == NULL((void *)0)) |
| 1895 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1895, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 1896 | if ((r = sshbuf_put_u32(m, MUX_C_NEW_SESSION0x10000002)) != 0 || |
| 1897 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0 || |
| 1898 | (r = sshbuf_put_string(m, NULL((void *)0), 0)) != 0 || /* reserved */ |
| 1899 | (r = sshbuf_put_u32(m, tty_flag)) != 0 || |
| 1900 | (r = sshbuf_put_u32(m, options.forward_x11)) != 0 || |
| 1901 | (r = sshbuf_put_u32(m, options.forward_agent)) != 0 || |
| 1902 | (r = sshbuf_put_u32(m, options.session_type == SESSION_TYPE_SUBSYSTEM1)) != 0 || |
| 1903 | (r = sshbuf_put_u32(m, echar)) != 0 || |
| 1904 | (r = sshbuf_put_cstring(m, term == NULL((void *)0) ? "" : term)) != 0 || |
| 1905 | (r = sshbuf_put_stringb(m, command)) != 0) |
| 1906 | fatal_fr(r, "request")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1906, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request"); |
| 1907 | |
| 1908 | /* Pass environment */ |
| 1909 | if (options.num_send_env > 0 && environ != NULL((void *)0)) { |
| 1910 | for (i = 0; environ[i] != NULL((void *)0); i++) { |
| 1911 | if (!env_permitted(environ[i])) |
| 1912 | continue; |
| 1913 | if ((r = sshbuf_put_cstring(m, environ[i])) != 0) |
| 1914 | fatal_fr(r, "request sendenv")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1914, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request sendenv"); |
| 1915 | } |
| 1916 | } |
| 1917 | for (i = 0; i < options.num_setenv; i++) { |
| 1918 | if ((r = sshbuf_put_cstring(m, options.setenv[i])) != 0) |
| 1919 | fatal_fr(r, "request setenv")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1919, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request setenv"); |
| 1920 | } |
| 1921 | |
| 1922 | if (mux_client_write_packet(fd, m) != 0) |
| 1923 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1923, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "write packet: %s", strerror ((*__errno()))); |
| 1924 | |
| 1925 | /* Send the stdio file descriptors */ |
| 1926 | if (mm_send_fd(fd, STDIN_FILENO0) == -1 || |
| 1927 | mm_send_fd(fd, STDOUT_FILENO1) == -1 || |
| 1928 | mm_send_fd(fd, STDERR_FILENO2) == -1) |
| 1929 | fatal_f("send fds failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1929, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "send fds failed"); |
| 1930 | |
| 1931 | debug3_f("session request sent")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1931, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "session request sent"); |
| 1932 | |
| 1933 | /* Read their reply */ |
| 1934 | sshbuf_reset(m); |
| 1935 | if (mux_client_read_packet(fd, m) != 0) { |
| 1936 | error_f("read from master failed: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1936, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "read from master failed: %s" , strerror((*__errno()))); |
| 1937 | sshbuf_free(m); |
| 1938 | return -1; |
| 1939 | } |
| 1940 | |
| 1941 | if ((r = sshbuf_get_u32(m, &type)) != 0 || |
| 1942 | (r = sshbuf_get_u32(m, &rid)) != 0) |
| 1943 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1943, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
| 1944 | if (rid != muxclient_request_id) |
| 1945 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1946, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
| 1946 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1946, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
| 1947 | |
| 1948 | switch (type) { |
| 1949 | case MUX_S_SESSION_OPENED0x80000006: |
| 1950 | if ((r = sshbuf_get_u32(m, &sid)) != 0) |
| 1951 | fatal_fr(r, "parse session ID")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1951, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse session ID"); |
| 1952 | debug_f("master session id: %u", sid)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1952, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "master session id: %u", sid ); |
| 1953 | break; |
| 1954 | case MUX_S_PERMISSION_DENIED0x80000002: |
| 1955 | if ((r = sshbuf_get_cstring(m, &e, NULL((void *)0))) != 0) |
| 1956 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1956, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
| 1957 | error("Master refused session request: %s", e)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1957, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Master refused session request: %s" , e); |
| 1958 | sshbuf_free(m); |
| 1959 | return -1; |
| 1960 | case MUX_S_FAILURE0x80000003: |
| 1961 | if ((r = sshbuf_get_cstring(m, &e, NULL((void *)0))) != 0) |
| 1962 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1962, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
| 1963 | error_f("session request failed: %s", e)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1963, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "session request failed: %s" , e); |
| 1964 | sshbuf_free(m); |
| 1965 | return -1; |
| 1966 | default: |
| 1967 | sshbuf_free(m); |
| 1968 | error_f("unexpected response from master 0x%08x", type)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1968, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "unexpected response from master 0x%08x" , type); |
| 1969 | return -1; |
| 1970 | } |
| 1971 | muxclient_request_id++; |
| 1972 | |
| 1973 | if (pledge("stdio proc tty", NULL((void *)0)) == -1) |
| 1974 | fatal_f("pledge(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 1974, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "pledge(): %s", strerror ((*__errno()))); |
| 1975 | |
| 1976 | ssh_signal(SIGHUP1, control_client_sighandler); |
| 1977 | ssh_signal(SIGINT2, control_client_sighandler); |
| 1978 | ssh_signal(SIGTERM15, control_client_sighandler); |
| 1979 | ssh_signal(SIGWINCH28, control_client_sigrelay); |
| 1980 | |
| 1981 | if (options.fork_after_authentication) |
| 1982 | daemon(1, 1); |
| 1983 | else { |
| 1984 | rawmode = tty_flag; |
| 1985 | if (tty_flag) { |
| 1986 | enter_raw_mode( |
| 1987 | options.request_tty == REQUEST_TTY_FORCE3); |
| 1988 | } |
| 1989 | } |
| 1990 | |
| 1991 | /* |
| 1992 | * Stick around until the controlee closes the client_fd. |
| 1993 | * Before it does, it is expected to write an exit message. |
| 1994 | * This process must read the value and wait for the closure of |
| 1995 | * the client_fd; if this one closes early, the multiplex master will |
| 1996 | * terminate early too (possibly losing data). |
| 1997 | */ |
| 1998 | for (exitval = 255, exitval_seen = 0;;) { |
| 1999 | sshbuf_reset(m); |
| 2000 | if (mux_client_read_packet(fd, m) != 0) |
| 2001 | break; |
| 2002 | if ((r = sshbuf_get_u32(m, &type)) != 0) |
| 2003 | fatal_fr(r, "parse type")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2003, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse type"); |
| 2004 | switch (type) { |
| 2005 | case MUX_S_TTY_ALLOC_FAIL0x80000008: |
| 2006 | if ((r = sshbuf_get_u32(m, &esid)) != 0) |
| 2007 | fatal_fr(r, "parse session ID")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2007, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse session ID"); |
| 2008 | if (esid != sid) |
| 2009 | fatal_f("tty alloc fail on unknown session: "sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2010, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "tty alloc fail on unknown session: " "my id %u theirs %u", sid, esid) |
| 2010 | "my id %u theirs %u", sid, esid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2010, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "tty alloc fail on unknown session: " "my id %u theirs %u", sid, esid); |
| 2011 | leave_raw_mode(options.request_tty == |
| 2012 | REQUEST_TTY_FORCE3); |
| 2013 | rawmode = 0; |
| 2014 | continue; |
| 2015 | case MUX_S_EXIT_MESSAGE0x80000004: |
| 2016 | if ((r = sshbuf_get_u32(m, &esid)) != 0) |
| 2017 | fatal_fr(r, "parse session ID")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2017, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse session ID"); |
| 2018 | if (esid != sid) |
| 2019 | fatal_f("exit on unknown session: "sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2020, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "exit on unknown session: " "my id %u theirs %u", sid, esid) |
| 2020 | "my id %u theirs %u", sid, esid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2020, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "exit on unknown session: " "my id %u theirs %u", sid, esid); |
| 2021 | if (exitval_seen) |
| 2022 | fatal_f("exitval sent twice")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2022, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "exitval sent twice"); |
| 2023 | if ((r = sshbuf_get_u32(m, &exitval)) != 0) |
| 2024 | fatal_fr(r, "parse exitval")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2024, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse exitval"); |
| 2025 | exitval_seen = 1; |
| 2026 | continue; |
| 2027 | default: |
| 2028 | if ((r = sshbuf_get_cstring(m, &e, NULL((void *)0))) != 0) |
| 2029 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2029, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
| 2030 | fatal_f("master returned error: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2030, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "master returned error: %s" , e); |
| 2031 | } |
| 2032 | } |
| 2033 | |
| 2034 | close(fd); |
| 2035 | if (rawmode) |
| 2036 | leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE3); |
| 2037 | |
| 2038 | if (muxclient_terminate) { |
| 2039 | debug2("Exiting on signal: %s", strsignal(muxclient_terminate))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2039, 0 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "Exiting on signal: %s", strsignal (muxclient_terminate)); |
| 2040 | exitval = 255; |
| 2041 | } else if (!exitval_seen) { |
| 2042 | debug2("Control master terminated unexpectedly")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2042, 0 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "Control master terminated unexpectedly" ); |
| 2043 | exitval = 255; |
| 2044 | } else |
| 2045 | debug2("Received exit status from master %d", exitval)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2045, 0 , SYSLOG_LEVEL_DEBUG2, ((void *)0), "Received exit status from master %d" , exitval); |
| 2046 | |
| 2047 | if (tty_flag && options.log_level >= SYSLOG_LEVEL_INFO) |
| 2048 | fprintf(stderr(&__sF[2]), "Shared connection to %s closed.\r\n", host); |
| 2049 | |
| 2050 | exit(exitval); |
| 2051 | } |
| 2052 | |
| 2053 | static int |
| 2054 | mux_client_proxy(int fd) |
| 2055 | { |
| 2056 | struct sshbuf *m; |
| 2057 | char *e; |
| 2058 | u_int type, rid; |
| 2059 | int r; |
| 2060 | |
| 2061 | if ((m = sshbuf_new()) == NULL((void *)0)) |
| 2062 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2062, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 2063 | if ((r = sshbuf_put_u32(m, MUX_C_PROXY0x1000000f)) != 0 || |
| 2064 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0) |
| 2065 | fatal_fr(r, "request")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2065, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request"); |
| 2066 | if (mux_client_write_packet(fd, m) != 0) |
| 2067 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2067, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "write packet: %s", strerror ((*__errno()))); |
| 2068 | |
| 2069 | sshbuf_reset(m); |
| 2070 | |
| 2071 | /* Read their reply */ |
| 2072 | if (mux_client_read_packet(fd, m) != 0) { |
| 2073 | sshbuf_free(m); |
| 2074 | return 0; |
| 2075 | } |
| 2076 | if ((r = sshbuf_get_u32(m, &type)) != 0 || |
| 2077 | (r = sshbuf_get_u32(m, &rid)) != 0) |
| 2078 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2078, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
| 2079 | if (rid != muxclient_request_id) |
| 2080 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2081, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
| 2081 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2081, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
| 2082 | if (type != MUX_S_PROXY0x8000000f) { |
| 2083 | if ((r = sshbuf_get_cstring(m, &e, NULL((void *)0))) != 0) |
| 2084 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2084, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
| 2085 | fatal_f("master returned error: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2085, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "master returned error: %s" , e); |
| 2086 | } |
| 2087 | sshbuf_free(m); |
| 2088 | |
| 2089 | debug3_f("done")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2089, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "done"); |
| 2090 | muxclient_request_id++; |
| 2091 | return 0; |
| 2092 | } |
| 2093 | |
| 2094 | static int |
| 2095 | mux_client_request_stdio_fwd(int fd) |
| 2096 | { |
| 2097 | struct sshbuf *m; |
| 2098 | char *e; |
| 2099 | u_int type, rid, sid; |
| 2100 | int r; |
| 2101 | |
| 2102 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2102, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "entering"); |
| 2103 | |
| 2104 | if ((muxserver_pid = mux_client_request_alive(fd)) == 0) { |
| 2105 | error_f("master alive request failed")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2105, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "master alive request failed" ); |
| 2106 | return -1; |
| 2107 | } |
| 2108 | |
| 2109 | ssh_signal(SIGPIPE13, SIG_IGN(void (*)(int))1); |
| 2110 | |
| 2111 | if (options.stdin_null && stdfd_devnull(1, 0, 0) == -1) |
| 2112 | fatal_f("stdfd_devnull failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2112, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "stdfd_devnull failed"); |
| 2113 | |
| 2114 | if ((m = sshbuf_new()) == NULL((void *)0)) |
| 2115 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2115, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 2116 | if ((r = sshbuf_put_u32(m, MUX_C_NEW_STDIO_FWD0x10000008)) != 0 || |
| 2117 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0 || |
| 2118 | (r = sshbuf_put_string(m, NULL((void *)0), 0)) != 0 || /* reserved */ |
| 2119 | (r = sshbuf_put_cstring(m, options.stdio_forward_host)) != 0 || |
| 2120 | (r = sshbuf_put_u32(m, options.stdio_forward_port)) != 0) |
| 2121 | fatal_fr(r, "request")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2121, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request"); |
| 2122 | |
| 2123 | if (mux_client_write_packet(fd, m) != 0) |
| 2124 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2124, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "write packet: %s", strerror ((*__errno()))); |
| 2125 | |
| 2126 | /* Send the stdio file descriptors */ |
| 2127 | if (mm_send_fd(fd, STDIN_FILENO0) == -1 || |
| 2128 | mm_send_fd(fd, STDOUT_FILENO1) == -1) |
| 2129 | fatal_f("send fds failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2129, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "send fds failed"); |
| 2130 | |
| 2131 | if (pledge("stdio proc tty", NULL((void *)0)) == -1) |
| 2132 | fatal_f("pledge(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2132, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "pledge(): %s", strerror ((*__errno()))); |
| 2133 | |
| 2134 | debug3_f("stdio forward request sent")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2134, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "stdio forward request sent" ); |
| 2135 | |
| 2136 | /* Read their reply */ |
| 2137 | sshbuf_reset(m); |
| 2138 | |
| 2139 | if (mux_client_read_packet(fd, m) != 0) { |
| 2140 | error_f("read from master failed: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2140, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "read from master failed: %s" , strerror((*__errno()))); |
| 2141 | sshbuf_free(m); |
| 2142 | return -1; |
| 2143 | } |
| 2144 | |
| 2145 | if ((r = sshbuf_get_u32(m, &type)) != 0 || |
| 2146 | (r = sshbuf_get_u32(m, &rid)) != 0) |
| 2147 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2147, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
| 2148 | if (rid != muxclient_request_id) |
| 2149 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2150, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
| 2150 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2150, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
| 2151 | switch (type) { |
| 2152 | case MUX_S_SESSION_OPENED0x80000006: |
| 2153 | if ((r = sshbuf_get_u32(m, &sid)) != 0) |
| 2154 | fatal_fr(r, "parse session ID")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2154, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse session ID"); |
| 2155 | debug_f("master session id: %u", sid)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2155, 1 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "master session id: %u", sid ); |
| 2156 | break; |
| 2157 | case MUX_S_PERMISSION_DENIED0x80000002: |
| 2158 | if ((r = sshbuf_get_cstring(m, &e, NULL((void *)0))) != 0) |
| 2159 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2159, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
| 2160 | sshbuf_free(m); |
| 2161 | fatal("Master refused stdio forwarding request: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2161, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Master refused stdio forwarding request: %s" , e); |
| 2162 | case MUX_S_FAILURE0x80000003: |
| 2163 | if ((r = sshbuf_get_cstring(m, &e, NULL((void *)0))) != 0) |
| 2164 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2164, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
| 2165 | sshbuf_free(m); |
| 2166 | fatal("Stdio forwarding request failed: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2166, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Stdio forwarding request failed: %s" , e); |
| 2167 | default: |
| 2168 | sshbuf_free(m); |
| 2169 | error_f("unexpected response from master 0x%08x", type)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2169, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "unexpected response from master 0x%08x" , type); |
| 2170 | return -1; |
| 2171 | } |
| 2172 | muxclient_request_id++; |
| 2173 | |
| 2174 | ssh_signal(SIGHUP1, control_client_sighandler); |
| 2175 | ssh_signal(SIGINT2, control_client_sighandler); |
| 2176 | ssh_signal(SIGTERM15, control_client_sighandler); |
| 2177 | ssh_signal(SIGWINCH28, control_client_sigrelay); |
| 2178 | |
| 2179 | /* |
| 2180 | * Stick around until the controlee closes the client_fd. |
| 2181 | */ |
| 2182 | sshbuf_reset(m); |
| 2183 | if (mux_client_read_packet(fd, m) != 0) { |
| 2184 | if (errno(*__errno()) == EPIPE32 || |
| 2185 | (errno(*__errno()) == EINTR4 && muxclient_terminate != 0)) |
| 2186 | return 0; |
| 2187 | fatal_f("mux_client_read_packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2187, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "mux_client_read_packet: %s" , strerror((*__errno()))); |
| 2188 | } |
| 2189 | fatal_f("master returned unexpected message %u", type)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2189, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "master returned unexpected message %u" , type); |
| 2190 | } |
| 2191 | |
| 2192 | static void |
| 2193 | mux_client_request_stop_listening(int fd) |
| 2194 | { |
| 2195 | struct sshbuf *m; |
| 2196 | char *e; |
| 2197 | u_int type, rid; |
| 2198 | int r; |
| 2199 | |
| 2200 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2200, 1 , SYSLOG_LEVEL_DEBUG3, ((void *)0), "entering"); |
| 2201 | |
| 2202 | if ((m = sshbuf_new()) == NULL((void *)0)) |
| 2203 | fatal_f("sshbuf_new")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2203, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new"); |
| 2204 | if ((r = sshbuf_put_u32(m, MUX_C_STOP_LISTENING0x10000009)) != 0 || |
| 2205 | (r = sshbuf_put_u32(m, muxclient_request_id)) != 0) |
| 2206 | fatal_fr(r, "request")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2206, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "request"); |
| 2207 | |
| 2208 | if (mux_client_write_packet(fd, m) != 0) |
| 2209 | fatal_f("write packet: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2209, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "write packet: %s", strerror ((*__errno()))); |
| 2210 | |
| 2211 | sshbuf_reset(m); |
| 2212 | |
| 2213 | /* Read their reply */ |
| 2214 | if (mux_client_read_packet(fd, m) != 0) |
| 2215 | fatal_f("read from master failed: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2215, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "read from master failed: %s" , strerror((*__errno()))); |
| 2216 | |
| 2217 | if ((r = sshbuf_get_u32(m, &type)) != 0 || |
| 2218 | (r = sshbuf_get_u32(m, &rid)) != 0) |
| 2219 | fatal_fr(r, "parse")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2219, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse"); |
| 2220 | if (rid != muxclient_request_id) |
| 2221 | fatal_f("out of sequence reply: my id %u theirs %u",sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2222, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid) |
| 2222 | muxclient_request_id, rid)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2222, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "out of sequence reply: my id %u theirs %u" , muxclient_request_id, rid); |
| 2223 | |
| 2224 | switch (type) { |
| 2225 | case MUX_S_OK0x80000001: |
| 2226 | break; |
| 2227 | case MUX_S_PERMISSION_DENIED0x80000002: |
| 2228 | if ((r = sshbuf_get_cstring(m, &e, NULL((void *)0))) != 0) |
| 2229 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2229, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
| 2230 | fatal("Master refused stop listening request: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2230, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Master refused stop listening request: %s" , e); |
| 2231 | case MUX_S_FAILURE0x80000003: |
| 2232 | if ((r = sshbuf_get_cstring(m, &e, NULL((void *)0))) != 0) |
| 2233 | fatal_fr(r, "parse error message")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2233, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "parse error message"); |
| 2234 | fatal_f("stop listening request failed: %s", e)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2234, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "stop listening request failed: %s" , e); |
| 2235 | default: |
| 2236 | fatal_f("unexpected response from master 0x%08x", type)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2236, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "unexpected response from master 0x%08x" , type); |
| 2237 | } |
| 2238 | sshbuf_free(m); |
| 2239 | muxclient_request_id++; |
| 2240 | } |
| 2241 | |
| 2242 | /* Multiplex client main loop. */ |
| 2243 | int |
| 2244 | muxclient(const char *path) |
| 2245 | { |
| 2246 | struct sockaddr_un addr; |
| 2247 | int sock, timeout = options.connection_timeout, timeout_ms = -1; |
| 2248 | u_int pid; |
| 2249 | |
| 2250 | if (muxclient_command == 0) { |
| 2251 | if (options.stdio_forward_host != NULL((void *)0)) |
| 2252 | muxclient_command = SSHMUX_COMMAND_STDIO_FWD4; |
| 2253 | else |
| 2254 | muxclient_command = SSHMUX_COMMAND_OPEN1; |
| 2255 | } |
| 2256 | |
| 2257 | switch (options.control_master) { |
| 2258 | case SSHCTL_MASTER_AUTO2: |
| 2259 | case SSHCTL_MASTER_AUTO_ASK4: |
| 2260 | debug("auto-mux: Trying existing master at '%s'", path)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2260, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "auto-mux: Trying existing master at '%s'" , path); |
| 2261 | /* FALLTHROUGH */ |
| 2262 | case SSHCTL_MASTER_NO0: |
| 2263 | break; |
| 2264 | default: |
| 2265 | return -1; |
| 2266 | } |
| 2267 | |
| 2268 | memset(&addr, '\0', sizeof(addr)); |
| 2269 | addr.sun_family = AF_UNIX1; |
| 2270 | |
| 2271 | if (strlcpy(addr.sun_path, path, |
| 2272 | sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) |
| 2273 | fatal("ControlPath too long ('%s' >= %u bytes)", path,sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2274, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "ControlPath too long ('%s' >= %u bytes)" , path, (unsigned int)sizeof(addr.sun_path)) |
| 2274 | (unsigned int)sizeof(addr.sun_path))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2274, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "ControlPath too long ('%s' >= %u bytes)" , path, (unsigned int)sizeof(addr.sun_path)); |
| 2275 | |
| 2276 | if ((sock = socket(PF_UNIX1, SOCK_STREAM1, 0)) == -1) |
| 2277 | fatal_f("socket(): %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2277, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "socket(): %s", strerror ((*__errno()))); |
| 2278 | |
| 2279 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
| 2280 | switch (muxclient_command) { |
| 2281 | case SSHMUX_COMMAND_OPEN1: |
| 2282 | case SSHMUX_COMMAND_STDIO_FWD4: |
| 2283 | break; |
| 2284 | default: |
| 2285 | fatal("Control socket connect(%.100s): %s", path,sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2286, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Control socket connect(%.100s): %s" , path, strerror((*__errno()))) |
| 2286 | strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2286, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Control socket connect(%.100s): %s" , path, strerror((*__errno()))); |
| 2287 | } |
| 2288 | if (errno(*__errno()) == ECONNREFUSED61 && |
| 2289 | options.control_master != SSHCTL_MASTER_NO0) { |
| 2290 | debug("Stale control socket %.100s, unlinking", path)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2290, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "Stale control socket %.100s, unlinking" , path); |
| 2291 | unlink(path); |
| 2292 | } else if (errno(*__errno()) == ENOENT2) { |
| 2293 | debug("Control socket \"%.100s\" does not exist", path)sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2293, 0 , SYSLOG_LEVEL_DEBUG1, ((void *)0), "Control socket \"%.100s\" does not exist" , path); |
| 2294 | } else { |
| 2295 | error("Control socket connect(%.100s): %s", path,sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2296, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Control socket connect(%.100s): %s" , path, strerror((*__errno()))) |
| 2296 | strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2296, 0 , SYSLOG_LEVEL_ERROR, ((void *)0), "Control socket connect(%.100s): %s" , path, strerror((*__errno()))); |
| 2297 | } |
| 2298 | close(sock); |
| 2299 | return -1; |
| 2300 | } |
| 2301 | set_nonblock(sock); |
| 2302 | |
| 2303 | /* Timeout on initial connection only. */ |
| 2304 | if (timeout > 0 && timeout < INT_MAX0x7fffffff / 1000) |
| 2305 | timeout_ms = timeout * 1000; |
| 2306 | |
| 2307 | if (mux_client_hello_exchange(sock, timeout_ms) != 0) { |
| 2308 | error_f("master hello exchange failed")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2308, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "master hello exchange failed" ); |
| 2309 | close(sock); |
| 2310 | return -1; |
| 2311 | } |
| 2312 | |
| 2313 | switch (muxclient_command) { |
| 2314 | case SSHMUX_COMMAND_ALIVE_CHECK2: |
| 2315 | if ((pid = mux_client_request_alive(sock)) == 0) |
| 2316 | fatal_f("master alive check failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2316, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "master alive check failed" ); |
| 2317 | fprintf(stderr(&__sF[2]), "Master running (pid=%u)\r\n", pid); |
| 2318 | exit(0); |
| 2319 | case SSHMUX_COMMAND_TERMINATE3: |
| 2320 | mux_client_request_terminate(sock); |
| 2321 | if (options.log_level != SYSLOG_LEVEL_QUIET) |
| 2322 | fprintf(stderr(&__sF[2]), "Exit request sent.\r\n"); |
| 2323 | exit(0); |
| 2324 | case SSHMUX_COMMAND_FORWARD5: |
| 2325 | if (mux_client_forwards(sock, 0) != 0) |
| 2326 | fatal_f("master forward request failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2326, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "master forward request failed" ); |
| 2327 | exit(0); |
| 2328 | case SSHMUX_COMMAND_OPEN1: |
| 2329 | if (mux_client_forwards(sock, 0) != 0) { |
| 2330 | error_f("master forward request failed")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2330, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "master forward request failed" ); |
| 2331 | return -1; |
| 2332 | } |
| 2333 | mux_client_request_session(sock); |
| 2334 | return -1; |
| 2335 | case SSHMUX_COMMAND_STDIO_FWD4: |
| 2336 | mux_client_request_stdio_fwd(sock); |
| 2337 | exit(0); |
| 2338 | case SSHMUX_COMMAND_STOP6: |
| 2339 | mux_client_request_stop_listening(sock); |
| 2340 | if (options.log_level != SYSLOG_LEVEL_QUIET) |
| 2341 | fprintf(stderr(&__sF[2]), "Stop listening request sent.\r\n"); |
| 2342 | exit(0); |
| 2343 | case SSHMUX_COMMAND_CANCEL_FWD7: |
| 2344 | if (mux_client_forwards(sock, 1) != 0) |
| 2345 | error_f("master cancel forward request failed")sshlog("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2345, 1 , SYSLOG_LEVEL_ERROR, ((void *)0), "master cancel forward request failed" ); |
| 2346 | exit(0); |
| 2347 | case SSHMUX_COMMAND_PROXY8: |
| 2348 | mux_client_proxy(sock); |
| 2349 | return (sock); |
| 2350 | default: |
| 2351 | fatal("unrecognised muxclient_command %d", muxclient_command)sshfatal("/usr/src/usr.bin/ssh/ssh/../mux.c", __func__, 2351, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "unrecognised muxclient_command %d" , muxclient_command); |
| 2352 | } |
| 2353 | } |