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7368a6c8 | 1 | /* |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
bcbf86ec | 4 | * |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | * | |
e78a59f5 | 11 | * SSH2 support by Markus Friedl. |
a96070d4 | 12 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 13 | * |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions | |
16 | * are met: | |
17 | * 1. Redistributions of source code must retain the above copyright | |
18 | * notice, this list of conditions and the following disclaimer. | |
19 | * 2. Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
e78a59f5 | 33 | */ |
7368a6c8 | 34 | |
35 | #include "includes.h" | |
fdaef11e | 36 | RCSID("$OpenBSD: session.c,v 1.167 2003/11/04 08:54:09 djm Exp $"); |
7368a6c8 | 37 | |
7368a6c8 | 38 | #include "ssh.h" |
42f11eb2 | 39 | #include "ssh1.h" |
40 | #include "ssh2.h" | |
41 | #include "xmalloc.h" | |
1729c161 | 42 | #include "sshpty.h" |
7368a6c8 | 43 | #include "packet.h" |
44 | #include "buffer.h" | |
7368a6c8 | 45 | #include "mpaux.h" |
7368a6c8 | 46 | #include "uidswap.h" |
47 | #include "compat.h" | |
a5efa1bb | 48 | #include "channels.h" |
e78a59f5 | 49 | #include "bufaux.h" |
e78a59f5 | 50 | #include "auth.h" |
38c295d6 | 51 | #include "auth-options.h" |
42f11eb2 | 52 | #include "pathnames.h" |
53 | #include "log.h" | |
54 | #include "servconf.h" | |
1729c161 | 55 | #include "sshlogin.h" |
42f11eb2 | 56 | #include "serverloop.h" |
57 | #include "canohost.h" | |
5ca51e19 | 58 | #include "session.h" |
1853d1ef | 59 | #include "monitor_wrap.h" |
e78a59f5 | 60 | |
7364bd04 | 61 | #ifdef GSSAPI |
62 | #include "ssh-gss.h" | |
63 | #endif | |
64 | ||
7368a6c8 | 65 | /* func */ |
66 | ||
67 | Session *session_new(void); | |
9c328529 | 68 | void session_set_fds(Session *, int, int, int); |
2362db19 | 69 | void session_pty_cleanup(Session *); |
9c328529 | 70 | void session_proctitle(Session *); |
71 | int session_setup_x11fwd(Session *); | |
72 | void do_exec_pty(Session *, const char *); | |
73 | void do_exec_no_pty(Session *, const char *); | |
74 | void do_exec(Session *, const char *); | |
75 | void do_login(Session *, const char *); | |
8a9ac95d | 76 | #ifdef LOGIN_NEEDS_UTMPX |
77 | static void do_pre_login(Session *s); | |
78 | #endif | |
9c328529 | 79 | void do_child(Session *, const char *); |
f2c2fd71 | 80 | void do_motd(void); |
9c328529 | 81 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 82 | |
396c147e | 83 | static void do_authenticated1(Authctxt *); |
84 | static void do_authenticated2(Authctxt *); | |
9c328529 | 85 | |
396c147e | 86 | static int session_pty_req(Session *); |
bb5639fe | 87 | |
7368a6c8 | 88 | /* import */ |
89 | extern ServerOptions options; | |
90 | extern char *__progname; | |
91 | extern int log_stderr; | |
92 | extern int debug_flag; | |
1e3b8b07 | 93 | extern u_int utmp_len; |
089fbbd2 | 94 | extern int startup_pipe; |
e78e738a | 95 | extern void destroy_sensitive_data(void); |
bc7dfc06 | 96 | extern Buffer loginmsg; |
089fbbd2 | 97 | |
b5e300c2 | 98 | /* original command from peer. */ |
c95add71 | 99 | const char *original_command = NULL; |
b5e300c2 | 100 | |
7368a6c8 | 101 | /* data */ |
102 | #define MAX_SESSIONS 10 | |
103 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 104 | |
2e73a022 | 105 | #ifdef HAVE_LOGIN_CAP |
1836f69f | 106 | login_cap_t *lc; |
2e73a022 | 107 | #endif |
108 | ||
2362db19 | 109 | static int is_child = 0; |
110 | ||
149cdb60 | 111 | /* Name and directory of socket for authentication agent forwarding. */ |
112 | static char *auth_sock_name = NULL; | |
113 | static char *auth_sock_dir = NULL; | |
114 | ||
115 | /* removes the agent forwarding socket */ | |
116 | ||
117 | static void | |
2362db19 | 118 | auth_sock_cleanup_proc(struct passwd *pw) |
149cdb60 | 119 | { |
149cdb60 | 120 | if (auth_sock_name != NULL) { |
121 | temporarily_use_uid(pw); | |
122 | unlink(auth_sock_name); | |
123 | rmdir(auth_sock_dir); | |
124 | auth_sock_name = NULL; | |
125 | restore_uid(); | |
126 | } | |
127 | } | |
128 | ||
129 | static int | |
130 | auth_input_request_forwarding(struct passwd * pw) | |
131 | { | |
132 | Channel *nc; | |
133 | int sock; | |
134 | struct sockaddr_un sunaddr; | |
135 | ||
136 | if (auth_sock_name != NULL) { | |
137 | error("authentication forwarding requested twice."); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
142 | temporarily_use_uid(pw); | |
143 | ||
144 | /* Allocate a buffer for the socket name, and format the name. */ | |
145 | auth_sock_name = xmalloc(MAXPATHLEN); | |
146 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
c88de854 | 147 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
149cdb60 | 148 | |
149 | /* Create private directory for socket */ | |
150 | if (mkdtemp(auth_sock_dir) == NULL) { | |
151 | packet_send_debug("Agent forwarding disabled: " | |
152 | "mkdtemp() failed: %.100s", strerror(errno)); | |
153 | restore_uid(); | |
154 | xfree(auth_sock_name); | |
155 | xfree(auth_sock_dir); | |
156 | auth_sock_name = NULL; | |
157 | auth_sock_dir = NULL; | |
158 | return 0; | |
159 | } | |
c457707e | 160 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
161 | auth_sock_dir, (long) getpid()); | |
149cdb60 | 162 | |
149cdb60 | 163 | /* Create the socket. */ |
164 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
165 | if (sock < 0) | |
166 | packet_disconnect("socket: %.100s", strerror(errno)); | |
167 | ||
168 | /* Bind it to the name. */ | |
169 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
170 | sunaddr.sun_family = AF_UNIX; | |
171 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
172 | ||
173 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
174 | packet_disconnect("bind: %.100s", strerror(errno)); | |
175 | ||
176 | /* Restore the privileged uid. */ | |
177 | restore_uid(); | |
178 | ||
179 | /* Start listening on the socket. */ | |
180 | if (listen(sock, 5) < 0) | |
181 | packet_disconnect("listen: %.100s", strerror(errno)); | |
182 | ||
183 | /* Allocate a channel for the authentication agent socket. */ | |
184 | nc = channel_new("auth socket", | |
185 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
186 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 187 | 0, "auth socket", 1); |
149cdb60 | 188 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
189 | return 1; | |
190 | } | |
191 | ||
192 | ||
bb5639fe | 193 | void |
194 | do_authenticated(Authctxt *authctxt) | |
195 | { | |
381b021b | 196 | setproctitle("%s", authctxt->pw->pw_name); |
197 | ||
bb5639fe | 198 | /* |
199 | * Cancel the alarm we set to limit the time taken for | |
200 | * authentication. | |
201 | */ | |
202 | alarm(0); | |
203 | if (startup_pipe != -1) { | |
204 | close(startup_pipe); | |
205 | startup_pipe = -1; | |
206 | } | |
19e810f6 | 207 | |
bb5639fe | 208 | /* setup the channel layer */ |
209 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
210 | channel_permit_all_opens(); | |
211 | ||
212 | if (compat20) | |
213 | do_authenticated2(authctxt); | |
214 | else | |
215 | do_authenticated1(authctxt); | |
e4f7282d | 216 | |
2362db19 | 217 | do_cleanup(authctxt); |
bb5639fe | 218 | } |
219 | ||
7368a6c8 | 220 | /* |
221 | * Prepares for an interactive session. This is called after the user has | |
222 | * been successfully authenticated. During this message exchange, pseudo | |
223 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
224 | * are requested, etc. | |
225 | */ | |
396c147e | 226 | static void |
bb5639fe | 227 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 228 | { |
229 | Session *s; | |
7368a6c8 | 230 | char *command; |
54a5250f | 231 | int success, type, screen_flag; |
7138ebd9 | 232 | int enable_compression_after_reply = 0; |
233 | u_int proto_len, data_len, dlen, compression_level = 0; | |
7368a6c8 | 234 | |
235 | s = session_new(); | |
ced49be2 | 236 | s->authctxt = authctxt; |
bb5639fe | 237 | s->pw = authctxt->pw; |
2e73a022 | 238 | |
7368a6c8 | 239 | /* |
240 | * We stay in this loop until the client requests to execute a shell | |
241 | * or a command. | |
242 | */ | |
243 | for (;;) { | |
bb5639fe | 244 | success = 0; |
7368a6c8 | 245 | |
246 | /* Get a packet from the client. */ | |
54a5250f | 247 | type = packet_read(); |
7368a6c8 | 248 | |
249 | /* Process the packet. */ | |
250 | switch (type) { | |
251 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 252 | compression_level = packet_get_int(); |
95500969 | 253 | packet_check_eom(); |
7368a6c8 | 254 | if (compression_level < 1 || compression_level > 9) { |
255 | packet_send_debug("Received illegal compression level %d.", | |
184eed6a | 256 | compression_level); |
7368a6c8 | 257 | break; |
258 | } | |
636f76ca | 259 | if (!options.compression) { |
260 | debug2("compression disabled"); | |
261 | break; | |
262 | } | |
7368a6c8 | 263 | /* Enable compression after we have responded with SUCCESS. */ |
264 | enable_compression_after_reply = 1; | |
265 | success = 1; | |
266 | break; | |
267 | ||
268 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 269 | success = session_pty_req(s); |
7368a6c8 | 270 | break; |
271 | ||
272 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 273 | s->auth_proto = packet_get_string(&proto_len); |
274 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 275 | |
2af09193 | 276 | screen_flag = packet_get_protocol_flags() & |
277 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
278 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
279 | ||
280 | if (packet_remaining() == 4) { | |
281 | if (!screen_flag) | |
282 | debug2("Buggy client: " | |
283 | "X11 screen flag missing"); | |
7368a6c8 | 284 | s->screen = packet_get_int(); |
c8b058b4 | 285 | } else { |
7368a6c8 | 286 | s->screen = 0; |
c8b058b4 | 287 | } |
95500969 | 288 | packet_check_eom(); |
8dcd9d5c | 289 | success = session_setup_x11fwd(s); |
290 | if (!success) { | |
291 | xfree(s->auth_proto); | |
292 | xfree(s->auth_data); | |
1500bcdd | 293 | s->auth_proto = NULL; |
294 | s->auth_data = NULL; | |
7368a6c8 | 295 | } |
7368a6c8 | 296 | break; |
7368a6c8 | 297 | |
298 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
299 | if (no_agent_forwarding_flag || compat13) { | |
300 | debug("Authentication agent forwarding not permitted for this authentication."); | |
301 | break; | |
302 | } | |
303 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 304 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 305 | break; |
306 | ||
307 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
308 | if (no_port_forwarding_flag) { | |
309 | debug("Port forwarding not permitted for this authentication."); | |
310 | break; | |
311 | } | |
33de75a3 | 312 | if (!options.allow_tcp_forwarding) { |
313 | debug("Port forwarding not permitted."); | |
314 | break; | |
315 | } | |
7368a6c8 | 316 | debug("Received TCP/IP port forwarding request."); |
bb5639fe | 317 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 318 | success = 1; |
319 | break; | |
320 | ||
321 | case SSH_CMSG_MAX_PACKET_SIZE: | |
322 | if (packet_set_maxsize(packet_get_int()) > 0) | |
323 | success = 1; | |
324 | break; | |
184eed6a | 325 | |
7368a6c8 | 326 | case SSH_CMSG_EXEC_SHELL: |
327 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 328 | if (type == SSH_CMSG_EXEC_CMD) { |
329 | command = packet_get_string(&dlen); | |
330 | debug("Exec command '%.500s'", command); | |
c95add71 | 331 | do_exec(s, command); |
332 | xfree(command); | |
7368a6c8 | 333 | } else { |
c95add71 | 334 | do_exec(s, NULL); |
7368a6c8 | 335 | } |
95500969 | 336 | packet_check_eom(); |
fc2a1d28 | 337 | session_close(s); |
7368a6c8 | 338 | return; |
339 | ||
340 | default: | |
341 | /* | |
342 | * Any unknown messages in this phase are ignored, | |
343 | * and a failure message is returned. | |
344 | */ | |
bbe88b6d | 345 | logit("Unknown packet type received after authentication: %d", type); |
7368a6c8 | 346 | } |
347 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
348 | packet_send(); | |
349 | packet_write_wait(); | |
350 | ||
351 | /* Enable compression now that we have replied if appropriate. */ | |
352 | if (enable_compression_after_reply) { | |
353 | enable_compression_after_reply = 0; | |
354 | packet_start_compression(compression_level); | |
355 | } | |
356 | } | |
357 | } | |
358 | ||
359 | /* | |
360 | * This is called to fork and execute a command when we have no tty. This | |
361 | * will call do_child from the child, and server_loop from the parent after | |
362 | * setting up file descriptors and such. | |
363 | */ | |
6ae2364d | 364 | void |
65068d16 | 365 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 366 | { |
c457707e | 367 | pid_t pid; |
7368a6c8 | 368 | |
369 | #ifdef USE_PIPES | |
370 | int pin[2], pout[2], perr[2]; | |
371 | /* Allocate pipes for communicating with the program. */ | |
372 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
373 | packet_disconnect("Could not create pipes: %.100s", | |
374 | strerror(errno)); | |
375 | #else /* USE_PIPES */ | |
376 | int inout[2], err[2]; | |
377 | /* Uses socket pairs to communicate with the program. */ | |
378 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
379 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
380 | packet_disconnect("Could not create socket pairs: %.100s", | |
381 | strerror(errno)); | |
382 | #endif /* USE_PIPES */ | |
383 | if (s == NULL) | |
384 | fatal("do_exec_no_pty: no session"); | |
385 | ||
1d1ffb87 | 386 | session_proctitle(s); |
7368a6c8 | 387 | |
b19d61d7 | 388 | #if defined(USE_PAM) |
7fceb20d | 389 | if (options.use_pam) { |
7fceb20d | 390 | do_pam_setcred(1); |
391 | if (is_pam_password_change_required()) | |
392 | packet_disconnect("Password change required but no " | |
393 | "TTY available"); | |
394 | } | |
266140a8 | 395 | #endif /* USE_PAM */ |
396 | ||
7368a6c8 | 397 | /* Fork the child. */ |
398 | if ((pid = fork()) == 0) { | |
2362db19 | 399 | is_child = 1; |
516f0d7d | 400 | |
7368a6c8 | 401 | /* Child. Reinitialize the log since the pid has changed. */ |
402 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
403 | ||
404 | /* | |
405 | * Create a new session and process group since the 4.4BSD | |
406 | * setlogin() affects the entire process group. | |
407 | */ | |
408 | if (setsid() < 0) | |
409 | error("setsid failed: %.100s", strerror(errno)); | |
410 | ||
411 | #ifdef USE_PIPES | |
412 | /* | |
413 | * Redirect stdin. We close the parent side of the socket | |
414 | * pair, and make the child side the standard input. | |
415 | */ | |
416 | close(pin[1]); | |
417 | if (dup2(pin[0], 0) < 0) | |
418 | perror("dup2 stdin"); | |
419 | close(pin[0]); | |
420 | ||
421 | /* Redirect stdout. */ | |
422 | close(pout[0]); | |
423 | if (dup2(pout[1], 1) < 0) | |
424 | perror("dup2 stdout"); | |
425 | close(pout[1]); | |
426 | ||
427 | /* Redirect stderr. */ | |
428 | close(perr[0]); | |
429 | if (dup2(perr[1], 2) < 0) | |
430 | perror("dup2 stderr"); | |
431 | close(perr[1]); | |
432 | #else /* USE_PIPES */ | |
433 | /* | |
434 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
435 | * use the same socket, as some programs (particularly rdist) | |
436 | * seem to depend on it. | |
437 | */ | |
438 | close(inout[1]); | |
439 | close(err[1]); | |
440 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
441 | perror("dup2 stdin"); | |
442 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
443 | perror("dup2 stdout"); | |
444 | if (dup2(err[0], 2) < 0) /* stderr */ | |
445 | perror("dup2 stderr"); | |
446 | #endif /* USE_PIPES */ | |
447 | ||
ef51930f | 448 | #ifdef _UNICOS |
449 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
450 | #endif | |
451 | ||
7368a6c8 | 452 | /* Do processing for the child (exec command etc). */ |
56b3e9ce | 453 | do_child(s, command); |
7368a6c8 | 454 | /* NOTREACHED */ |
455 | } | |
ef51930f | 456 | #ifdef _UNICOS |
457 | signal(WJSIGNAL, cray_job_termination_handler); | |
458 | #endif /* _UNICOS */ | |
3c62e7eb | 459 | #ifdef HAVE_CYGWIN |
460 | if (is_winnt) | |
461 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
462 | #endif | |
7368a6c8 | 463 | if (pid < 0) |
464 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
465 | s->pid = pid; | |
b5c334cc | 466 | /* Set interactive/non-interactive mode. */ |
467 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 468 | #ifdef USE_PIPES |
469 | /* We are the parent. Close the child sides of the pipes. */ | |
470 | close(pin[0]); | |
471 | close(pout[1]); | |
472 | close(perr[1]); | |
473 | ||
e78a59f5 | 474 | if (compat20) { |
e5d7a405 | 475 | session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); |
e78a59f5 | 476 | } else { |
477 | /* Enter the interactive session. */ | |
478 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 479 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 480 | } |
7368a6c8 | 481 | #else /* USE_PIPES */ |
482 | /* We are the parent. Close the child sides of the socket pairs. */ | |
483 | close(inout[0]); | |
484 | close(err[0]); | |
485 | ||
486 | /* | |
487 | * Enter the interactive session. Note: server_loop must be able to | |
488 | * handle the case that fdin and fdout are the same. | |
489 | */ | |
e78a59f5 | 490 | if (compat20) { |
e5d7a405 | 491 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 492 | } else { |
493 | server_loop(pid, inout[1], inout[1], err[1]); | |
494 | /* server_loop has closed inout[1] and err[1]. */ | |
495 | } | |
7368a6c8 | 496 | #endif /* USE_PIPES */ |
497 | } | |
498 | ||
499 | /* | |
500 | * This is called to fork and execute a command when we have a tty. This | |
501 | * will call do_child from the child, and server_loop from the parent after | |
502 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
503 | * lastlog, and other such operations. | |
504 | */ | |
6ae2364d | 505 | void |
65068d16 | 506 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 507 | { |
7368a6c8 | 508 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 509 | pid_t pid; |
7368a6c8 | 510 | |
511 | if (s == NULL) | |
512 | fatal("do_exec_pty: no session"); | |
513 | ptyfd = s->ptyfd; | |
514 | ttyfd = s->ttyfd; | |
515 | ||
b19d61d7 | 516 | #if defined(USE_PAM) |
7fceb20d | 517 | if (options.use_pam) { |
49e82bb9 | 518 | do_pam_set_tty(s->tty); |
7fceb20d | 519 | do_pam_setcred(1); |
520 | } | |
27cf96de | 521 | #endif |
266140a8 | 522 | |
7368a6c8 | 523 | /* Fork the child. */ |
524 | if ((pid = fork()) == 0) { | |
2362db19 | 525 | is_child = 1; |
57156994 | 526 | |
c345cf9d | 527 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 528 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 529 | /* Close the master side of the pseudo tty. */ |
530 | close(ptyfd); | |
531 | ||
532 | /* Make the pseudo tty our controlling tty. */ | |
533 | pty_make_controlling_tty(&ttyfd, s->tty); | |
534 | ||
05fd093c | 535 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
536 | if (dup2(ttyfd, 0) < 0) | |
537 | error("dup2 stdin: %s", strerror(errno)); | |
538 | if (dup2(ttyfd, 1) < 0) | |
539 | error("dup2 stdout: %s", strerror(errno)); | |
540 | if (dup2(ttyfd, 2) < 0) | |
541 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 542 | |
543 | /* Close the extra descriptor for the pseudo tty. */ | |
544 | close(ttyfd); | |
545 | ||
c345cf9d | 546 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 547 | #ifndef HAVE_OSF_SIA |
ef51930f | 548 | if (!(options.use_login && command == NULL)) { |
549 | #ifdef _UNICOS | |
550 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
551 | #endif /* _UNICOS */ | |
a22aff1f | 552 | do_login(s, command); |
ef51930f | 553 | } |
7e2d5fa4 | 554 | # ifdef LOGIN_NEEDS_UTMPX |
555 | else | |
556 | do_pre_login(s); | |
557 | # endif | |
c96a4aaf | 558 | #endif |
7368a6c8 | 559 | |
7368a6c8 | 560 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 561 | do_child(s, command); |
7368a6c8 | 562 | /* NOTREACHED */ |
563 | } | |
ef51930f | 564 | #ifdef _UNICOS |
565 | signal(WJSIGNAL, cray_job_termination_handler); | |
566 | #endif /* _UNICOS */ | |
3c62e7eb | 567 | #ifdef HAVE_CYGWIN |
568 | if (is_winnt) | |
569 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
570 | #endif | |
7368a6c8 | 571 | if (pid < 0) |
572 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
573 | s->pid = pid; | |
574 | ||
575 | /* Parent. Close the slave side of the pseudo tty. */ | |
576 | close(ttyfd); | |
577 | ||
578 | /* | |
579 | * Create another descriptor of the pty master side for use as the | |
580 | * standard input. We could use the original descriptor, but this | |
581 | * simplifies code in server_loop. The descriptor is bidirectional. | |
582 | */ | |
583 | fdout = dup(ptyfd); | |
584 | if (fdout < 0) | |
585 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
586 | ||
587 | /* we keep a reference to the pty master */ | |
588 | ptymaster = dup(ptyfd); | |
589 | if (ptymaster < 0) | |
590 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
591 | s->ptymaster = ptymaster; | |
592 | ||
593 | /* Enter interactive session. */ | |
b5c334cc | 594 | packet_set_interactive(1); |
e78a59f5 | 595 | if (compat20) { |
596 | session_set_fds(s, ptyfd, fdout, -1); | |
597 | } else { | |
598 | server_loop(pid, ptyfd, fdout, -1); | |
599 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 600 | } |
7368a6c8 | 601 | } |
602 | ||
7e2d5fa4 | 603 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 604 | static void |
7e2d5fa4 | 605 | do_pre_login(Session *s) |
606 | { | |
607 | socklen_t fromlen; | |
608 | struct sockaddr_storage from; | |
609 | pid_t pid = getpid(); | |
610 | ||
611 | /* | |
612 | * Get IP address of client. If the connection is not a socket, let | |
613 | * the address be 0.0.0.0. | |
614 | */ | |
615 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 616 | fromlen = sizeof(from); |
7e2d5fa4 | 617 | if (packet_connection_is_on_socket()) { |
7e2d5fa4 | 618 | if (getpeername(packet_get_connection_in(), |
184eed6a | 619 | (struct sockaddr *) & from, &fromlen) < 0) { |
7e2d5fa4 | 620 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 621 | cleanup_exit(255); |
7e2d5fa4 | 622 | } |
623 | } | |
624 | ||
625 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
c5a7d788 | 626 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d4ac26ed | 627 | (struct sockaddr *)&from, fromlen); |
7e2d5fa4 | 628 | } |
629 | #endif | |
630 | ||
dac6753b | 631 | /* |
632 | * This is called to fork and execute a command. If another command is | |
633 | * to be forced, execute that instead. | |
634 | */ | |
635 | void | |
636 | do_exec(Session *s, const char *command) | |
637 | { | |
638 | if (forced_command) { | |
639 | original_command = command; | |
640 | command = forced_command; | |
dac6753b | 641 | debug("Forced command '%.900s'", command); |
642 | } | |
643 | ||
f89f8ddc | 644 | #ifdef GSSAPI |
645 | if (options.gss_authentication) { | |
646 | temporarily_use_uid(s->pw); | |
647 | ssh_gssapi_storecreds(); | |
648 | restore_uid(); | |
649 | } | |
650 | #endif | |
651 | ||
dac6753b | 652 | if (s->ttyfd != -1) |
653 | do_exec_pty(s, command); | |
654 | else | |
655 | do_exec_no_pty(s, command); | |
656 | ||
c95add71 | 657 | original_command = NULL; |
dac6753b | 658 | } |
659 | ||
f7342052 | 660 | |
c345cf9d | 661 | /* administrative, login(1)-like work */ |
662 | void | |
a22aff1f | 663 | do_login(Session *s, const char *command) |
c345cf9d | 664 | { |
c345cf9d | 665 | char *time_string; |
c345cf9d | 666 | socklen_t fromlen; |
667 | struct sockaddr_storage from; | |
c345cf9d | 668 | struct passwd * pw = s->pw; |
669 | pid_t pid = getpid(); | |
670 | ||
671 | /* | |
672 | * Get IP address of client. If the connection is not a socket, let | |
673 | * the address be 0.0.0.0. | |
674 | */ | |
675 | memset(&from, 0, sizeof(from)); | |
d4ac26ed | 676 | fromlen = sizeof(from); |
c345cf9d | 677 | if (packet_connection_is_on_socket()) { |
c345cf9d | 678 | if (getpeername(packet_get_connection_in(), |
f7342052 | 679 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 680 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 681 | cleanup_exit(255); |
c345cf9d | 682 | } |
683 | } | |
684 | ||
685 | /* Record that there was a login on that tty from the remote host. */ | |
49a34e84 | 686 | if (!use_privsep) |
687 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
688 | get_remote_name_or_ip(utmp_len, | |
c5a7d788 | 689 | options.use_dns), |
ba1566dd | 690 | (struct sockaddr *)&from, fromlen); |
c345cf9d | 691 | |
2919e060 | 692 | #ifdef USE_PAM |
693 | /* | |
694 | * If password change is needed, do it now. | |
695 | * This needs to occur before the ~/.hushlogin check. | |
696 | */ | |
7fceb20d | 697 | if (options.use_pam && is_pam_password_change_required()) { |
2919e060 | 698 | print_pam_messages(); |
699 | do_pam_chauthtok(); | |
5b9e2464 | 700 | /* XXX - signal [net] parent to enable forwardings */ |
2919e060 | 701 | } |
702 | #endif | |
703 | ||
f2c2fd71 | 704 | if (check_quietlogin(s, command)) |
c345cf9d | 705 | return; |
706 | ||
707 | #ifdef USE_PAM | |
7fceb20d | 708 | if (options.use_pam && !is_pam_password_change_required()) |
2919e060 | 709 | print_pam_messages(); |
c345cf9d | 710 | #endif /* USE_PAM */ |
bc7dfc06 | 711 | |
712 | /* display post-login message */ | |
713 | if (buffer_len(&loginmsg) > 0) { | |
714 | buffer_append(&loginmsg, "\0", 1); | |
715 | printf("%s\n", (char *)buffer_ptr(&loginmsg)); | |
716 | } | |
717 | buffer_free(&loginmsg); | |
c345cf9d | 718 | |
ef51930f | 719 | #ifndef NO_SSH_LASTLOG |
ffbf7323 | 720 | if (options.print_lastlog && s->last_login_time != 0) { |
721 | time_string = ctime(&s->last_login_time); | |
c345cf9d | 722 | if (strchr(time_string, '\n')) |
723 | *strchr(time_string, '\n') = 0; | |
ffbf7323 | 724 | if (strcmp(s->hostname, "") == 0) |
c345cf9d | 725 | printf("Last login: %s\r\n", time_string); |
726 | else | |
ffbf7323 | 727 | printf("Last login: %s from %s\r\n", time_string, |
728 | s->hostname); | |
c345cf9d | 729 | } |
ef51930f | 730 | #endif /* NO_SSH_LASTLOG */ |
f2c2fd71 | 731 | |
732 | do_motd(); | |
733 | } | |
734 | ||
735 | /* | |
736 | * Display the message of the day. | |
737 | */ | |
738 | void | |
739 | do_motd(void) | |
740 | { | |
741 | FILE *f; | |
742 | char buf[256]; | |
743 | ||
c345cf9d | 744 | if (options.print_motd) { |
2e73a022 | 745 | #ifdef HAVE_LOGIN_CAP |
746 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
747 | "/etc/motd"), "r"); | |
748 | #else | |
c345cf9d | 749 | f = fopen("/etc/motd", "r"); |
2e73a022 | 750 | #endif |
c345cf9d | 751 | if (f) { |
752 | while (fgets(buf, sizeof(buf), f)) | |
753 | fputs(buf, stdout); | |
754 | fclose(f); | |
755 | } | |
756 | } | |
757 | } | |
758 | ||
9c328529 | 759 | |
760 | /* | |
761 | * Check for quiet login, either .hushlogin or command given. | |
762 | */ | |
763 | int | |
764 | check_quietlogin(Session *s, const char *command) | |
765 | { | |
766 | char buf[256]; | |
767 | struct passwd *pw = s->pw; | |
768 | struct stat st; | |
769 | ||
770 | /* Return 1 if .hushlogin exists or a command given. */ | |
771 | if (command != NULL) | |
772 | return 1; | |
773 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
774 | #ifdef HAVE_LOGIN_CAP | |
775 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
776 | return 1; | |
777 | #else | |
778 | if (stat(buf, &st) >= 0) | |
779 | return 1; | |
780 | #endif | |
781 | return 0; | |
782 | } | |
783 | ||
7368a6c8 | 784 | /* |
785 | * Sets the value of the given variable in the environment. If the variable | |
786 | * already exists, its value is overriden. | |
787 | */ | |
7364bd04 | 788 | void |
1e3b8b07 | 789 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
184eed6a | 790 | const char *value) |
7368a6c8 | 791 | { |
7368a6c8 | 792 | char **env; |
c46e584f | 793 | u_int envsize; |
794 | u_int i, namelen; | |
7368a6c8 | 795 | |
95b99395 | 796 | /* |
797 | * If we're passed an uninitialized list, allocate a single null | |
798 | * entry before continuing. | |
799 | */ | |
800 | if (*envp == NULL && *envsizep == 0) { | |
801 | *envp = xmalloc(sizeof(char *)); | |
802 | *envp[0] = NULL; | |
803 | *envsizep = 1; | |
804 | } | |
805 | ||
7368a6c8 | 806 | /* |
807 | * Find the slot where the value should be stored. If the variable | |
808 | * already exists, we reuse the slot; otherwise we append a new slot | |
809 | * at the end of the array, expanding if necessary. | |
810 | */ | |
811 | env = *envp; | |
812 | namelen = strlen(name); | |
813 | for (i = 0; env[i]; i++) | |
814 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
815 | break; | |
816 | if (env[i]) { | |
817 | /* Reuse the slot. */ | |
818 | xfree(env[i]); | |
819 | } else { | |
820 | /* New variable. Expand if necessary. */ | |
c46e584f | 821 | envsize = *envsizep; |
822 | if (i >= envsize - 1) { | |
823 | if (envsize >= 1000) | |
824 | fatal("child_set_env: too many env vars"); | |
825 | envsize += 50; | |
826 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); | |
827 | *envsizep = envsize; | |
7368a6c8 | 828 | } |
829 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
830 | env[i + 1] = NULL; | |
831 | } | |
832 | ||
833 | /* Allocate space and format the variable in the appropriate slot. */ | |
834 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
835 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
836 | } | |
837 | ||
838 | /* | |
839 | * Reads environment variables from the given file and adds/overrides them | |
840 | * into the environment. If the file does not exist, this does nothing. | |
841 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
842 | * and assignments of the form name=value. No other forms are allowed. | |
843 | */ | |
396c147e | 844 | static void |
1e3b8b07 | 845 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 846 | const char *filename) |
7368a6c8 | 847 | { |
848 | FILE *f; | |
849 | char buf[4096]; | |
850 | char *cp, *value; | |
66087567 | 851 | u_int lineno = 0; |
7368a6c8 | 852 | |
853 | f = fopen(filename, "r"); | |
854 | if (!f) | |
855 | return; | |
856 | ||
857 | while (fgets(buf, sizeof(buf), f)) { | |
66087567 | 858 | if (++lineno > 1000) |
859 | fatal("Too many lines in environment file %s", filename); | |
7368a6c8 | 860 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
861 | ; | |
862 | if (!*cp || *cp == '#' || *cp == '\n') | |
863 | continue; | |
864 | if (strchr(cp, '\n')) | |
865 | *strchr(cp, '\n') = '\0'; | |
866 | value = strchr(cp, '='); | |
867 | if (value == NULL) { | |
66087567 | 868 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
869 | filename); | |
7368a6c8 | 870 | continue; |
871 | } | |
71276795 | 872 | /* |
873 | * Replace the equals sign by nul, and advance value to | |
874 | * the value string. | |
875 | */ | |
7368a6c8 | 876 | *value = '\0'; |
877 | value++; | |
878 | child_set_env(env, envsize, cp, value); | |
879 | } | |
880 | fclose(f); | |
881 | } | |
882 | ||
95b99395 | 883 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
884 | /* | |
885 | * Return named variable from specified environment, or NULL if not present. | |
886 | */ | |
887 | static char * | |
888 | child_get_env(char **env, const char *name) | |
889 | { | |
890 | int i; | |
891 | size_t len; | |
892 | ||
893 | len = strlen(name); | |
894 | for (i=0; env[i] != NULL; i++) | |
895 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
896 | return(env[i] + len + 1); | |
897 | return NULL; | |
898 | } | |
899 | ||
900 | /* | |
901 | * Read /etc/default/login. | |
902 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
903 | */ | |
904 | static void | |
905 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
906 | { | |
907 | char **tmpenv = NULL, *var; | |
6f99680f | 908 | u_int i, tmpenvsize = 0; |
3a23ba0e | 909 | u_long mask; |
95b99395 | 910 | |
911 | /* | |
912 | * We don't want to copy the whole file to the child's environment, | |
913 | * so we use a temporary environment and copy the variables we're | |
914 | * interested in. | |
915 | */ | |
916 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
917 | ||
6f99680f | 918 | if (tmpenv == NULL) |
919 | return; | |
920 | ||
95b99395 | 921 | if (uid == 0) |
922 | var = child_get_env(tmpenv, "SUPATH"); | |
923 | else | |
924 | var = child_get_env(tmpenv, "PATH"); | |
925 | if (var != NULL) | |
926 | child_set_env(env, envsize, "PATH", var); | |
927 | ||
928 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) | |
929 | if (sscanf(var, "%5lo", &mask) == 1) | |
3a23ba0e | 930 | umask((mode_t)mask); |
95b99395 | 931 | |
932 | for (i = 0; tmpenv[i] != NULL; i++) | |
933 | xfree(tmpenv[i]); | |
934 | xfree(tmpenv); | |
935 | } | |
936 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
937 | ||
760b35a6 | 938 | void copy_environment(char **source, char ***env, u_int *envsize) |
7368a6c8 | 939 | { |
760b35a6 | 940 | char *var_name, *var_val; |
7368a6c8 | 941 | int i; |
942 | ||
760b35a6 | 943 | if (source == NULL) |
7368a6c8 | 944 | return; |
2b87da3b | 945 | |
760b35a6 | 946 | for(i = 0; source[i] != NULL; i++) { |
947 | var_name = xstrdup(source[i]); | |
948 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
949 | xfree(var_name); | |
7368a6c8 | 950 | continue; |
7368a6c8 | 951 | } |
760b35a6 | 952 | *var_val++ = '\0'; |
7368a6c8 | 953 | |
760b35a6 | 954 | debug3("Copy environment: %s=%s", var_name, var_val); |
955 | child_set_env(env, envsize, var_name, var_val); | |
956 | ||
957 | xfree(var_name); | |
22d89d24 | 958 | } |
959 | } | |
22d89d24 | 960 | |
f7342052 | 961 | static char ** |
962 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 963 | { |
7368a6c8 | 964 | char buf[256]; |
f7342052 | 965 | u_int i, envsize; |
95b99395 | 966 | char **env, *laddr, *path = NULL; |
f7342052 | 967 | struct passwd *pw = s->pw; |
7368a6c8 | 968 | |
7368a6c8 | 969 | /* Initialize the environment. */ |
970 | envsize = 100; | |
971 | env = xmalloc(envsize * sizeof(char *)); | |
972 | env[0] = NULL; | |
973 | ||
3c62e7eb | 974 | #ifdef HAVE_CYGWIN |
975 | /* | |
976 | * The Windows environment contains some setting which are | |
977 | * important for a running system. They must not be dropped. | |
978 | */ | |
760b35a6 | 979 | copy_environment(environ, &env, &envsize); |
3c62e7eb | 980 | #endif |
981 | ||
7364bd04 | 982 | #ifdef GSSAPI |
983 | /* Allow any GSSAPI methods that we've used to alter | |
984 | * the childs environment as they see fit | |
985 | */ | |
986 | ssh_gssapi_do_child(&env, &envsize); | |
987 | #endif | |
988 | ||
7368a6c8 | 989 | if (!options.use_login) { |
990 | /* Set basic environment. */ | |
991 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
992 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
17ed08c5 | 993 | #ifdef _AIX |
994 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
995 | #endif | |
7368a6c8 | 996 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
2e73a022 | 997 | #ifdef HAVE_LOGIN_CAP |
97686bf9 | 998 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
999 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1000 | else | |
1001 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1002 | #else /* HAVE_LOGIN_CAP */ |
1003 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1004 | /* |
1005 | * There's no standard path on Windows. The path contains | |
1006 | * important components pointing to the system directories, | |
1007 | * needed for loading shared libraries. So the path better | |
1008 | * remains intact here. | |
1009 | */ | |
95b99395 | 1010 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1011 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1012 | path = child_get_env(env, "PATH"); | |
1013 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1014 | if (path == NULL || *path == '\0') { | |
1015 | child_set_env(&env, &envsize, "PATH", | |
1016 | s->pw->pw_uid == 0 ? | |
1017 | SUPERUSER_PATH : _PATH_STDPATH); | |
1018 | } | |
22d89d24 | 1019 | # endif /* HAVE_CYGWIN */ |
1020 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1021 | |
1022 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1023 | _PATH_MAILDIR, pw->pw_name); | |
1024 | child_set_env(&env, &envsize, "MAIL", buf); | |
1025 | ||
1026 | /* Normal systems set SHELL by default. */ | |
1027 | child_set_env(&env, &envsize, "SHELL", shell); | |
1028 | } | |
1029 | if (getenv("TZ")) | |
1030 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1031 | ||
1032 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 1033 | if (!options.use_login) { |
1034 | while (custom_environment) { | |
1035 | struct envstring *ce = custom_environment; | |
7fdc56c5 | 1036 | char *str = ce->s; |
f7342052 | 1037 | |
7fdc56c5 | 1038 | for (i = 0; str[i] != '=' && str[i]; i++) |
2548961d | 1039 | ; |
7fdc56c5 | 1040 | if (str[i] == '=') { |
1041 | str[i] = 0; | |
1042 | child_set_env(&env, &envsize, str, str + i + 1); | |
2548961d | 1043 | } |
1044 | custom_environment = ce->next; | |
1045 | xfree(ce->s); | |
1046 | xfree(ce); | |
7368a6c8 | 1047 | } |
7368a6c8 | 1048 | } |
1049 | ||
da0561eb | 1050 | /* SSH_CLIENT deprecated */ |
7368a6c8 | 1051 | snprintf(buf, sizeof buf, "%.50s %d %d", |
f7342052 | 1052 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1053 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1054 | ||
3e2f2431 | 1055 | laddr = get_local_ipaddr(packet_get_connection_in()); |
da0561eb | 1056 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
3e2f2431 | 1057 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1058 | xfree(laddr); | |
da0561eb | 1059 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1060 | ||
56b3e9ce | 1061 | if (s->ttyfd != -1) |
1062 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1063 | if (s->term) | |
1064 | child_set_env(&env, &envsize, "TERM", s->term); | |
1065 | if (s->display) | |
1066 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1067 | if (original_command) |
1068 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1069 | original_command); | |
7368a6c8 | 1070 | |
ef51930f | 1071 | #ifdef _UNICOS |
1072 | if (cray_tmpdir[0] != '\0') | |
1073 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1074 | #endif /* _UNICOS */ | |
1075 | ||
7368a6c8 | 1076 | #ifdef _AIX |
4936fcee | 1077 | { |
1078 | char *cp; | |
1079 | ||
1080 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1081 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1082 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1083 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1084 | read_environment_file(&env, &envsize, "/etc/environment"); | |
1085 | } | |
7368a6c8 | 1086 | #endif |
ced49be2 | 1087 | #ifdef KRB5 |
1088 | if (s->authctxt->krb5_ticket_file) | |
1089 | child_set_env(&env, &envsize, "KRB5CCNAME", | |
1090 | s->authctxt->krb5_ticket_file); | |
1091 | #endif | |
7368a6c8 | 1092 | #ifdef USE_PAM |
ee48c949 | 1093 | /* |
1094 | * Pull in any environment variables that may have | |
1095 | * been set by PAM. | |
1096 | */ | |
7fceb20d | 1097 | if (options.use_pam) { |
2212fc98 | 1098 | char **p; |
1099 | ||
1100 | p = fetch_pam_child_environment(); | |
1101 | copy_environment(p, &env, &envsize); | |
1102 | free_pam_environment(p); | |
ee48c949 | 1103 | |
2212fc98 | 1104 | p = fetch_pam_environment(); |
ee48c949 | 1105 | copy_environment(p, &env, &envsize); |
1106 | free_pam_environment(p); | |
1107 | } | |
7368a6c8 | 1108 | #endif /* USE_PAM */ |
1109 | ||
149cdb60 | 1110 | if (auth_sock_name != NULL) |
7368a6c8 | 1111 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1112 | auth_sock_name); |
7368a6c8 | 1113 | |
1114 | /* read $HOME/.ssh/environment. */ | |
f00bab84 | 1115 | if (options.permit_user_env && !options.use_login) { |
71276795 | 1116 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e2e36358 | 1117 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
7368a6c8 | 1118 | read_environment_file(&env, &envsize, buf); |
1119 | } | |
1120 | if (debug_flag) { | |
1121 | /* dump the environment */ | |
1122 | fprintf(stderr, "Environment:\n"); | |
1123 | for (i = 0; env[i]; i++) | |
1124 | fprintf(stderr, " %.200s\n", env[i]); | |
1125 | } | |
f7342052 | 1126 | return env; |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1131 | * first in this order). | |
1132 | */ | |
1133 | static void | |
1134 | do_rc_files(Session *s, const char *shell) | |
1135 | { | |
1136 | FILE *f = NULL; | |
1137 | char cmd[1024]; | |
1138 | int do_xauth; | |
1139 | struct stat st; | |
1140 | ||
1141 | do_xauth = | |
1142 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1143 | ||
1144 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1145 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1146 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1147 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1148 | if (debug_flag) | |
1149 | fprintf(stderr, "Running %s\n", cmd); | |
1150 | f = popen(cmd, "w"); | |
1151 | if (f) { | |
1152 | if (do_xauth) | |
1153 | fprintf(f, "%s %s\n", s->auth_proto, | |
1154 | s->auth_data); | |
1155 | pclose(f); | |
1156 | } else | |
1157 | fprintf(stderr, "Could not run %s\n", | |
1158 | _PATH_SSH_USER_RC); | |
1159 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1160 | if (debug_flag) | |
1161 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1162 | _PATH_SSH_SYSTEM_RC); | |
1163 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1164 | if (f) { | |
1165 | if (do_xauth) | |
1166 | fprintf(f, "%s %s\n", s->auth_proto, | |
1167 | s->auth_data); | |
1168 | pclose(f); | |
1169 | } else | |
1170 | fprintf(stderr, "Could not run %s\n", | |
1171 | _PATH_SSH_SYSTEM_RC); | |
1172 | } else if (do_xauth && options.xauth_location != NULL) { | |
1173 | /* Add authority data to .Xauthority if appropriate. */ | |
1174 | if (debug_flag) { | |
1175 | fprintf(stderr, | |
fe661d8f | 1176 | "Running %.500s remove %.100s\n", |
2362db19 | 1177 | options.xauth_location, s->auth_display); |
fe661d8f | 1178 | fprintf(stderr, |
1179 | "%.500s add %.100s %.100s %.100s\n", | |
f7342052 | 1180 | options.xauth_location, s->auth_display, |
1181 | s->auth_proto, s->auth_data); | |
1182 | } | |
1183 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1184 | options.xauth_location); | |
1185 | f = popen(cmd, "w"); | |
1186 | if (f) { | |
fe661d8f | 1187 | fprintf(f, "remove %s\n", |
1188 | s->auth_display); | |
f7342052 | 1189 | fprintf(f, "add %s %s %s\n", |
1190 | s->auth_display, s->auth_proto, | |
1191 | s->auth_data); | |
1192 | pclose(f); | |
1193 | } else { | |
1194 | fprintf(stderr, "Could not run %s\n", | |
1195 | cmd); | |
1196 | } | |
1197 | } | |
1198 | } | |
1199 | ||
1200 | static void | |
1201 | do_nologin(struct passwd *pw) | |
1202 | { | |
1203 | FILE *f = NULL; | |
1204 | char buf[1024]; | |
1205 | ||
1206 | #ifdef HAVE_LOGIN_CAP | |
1207 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1208 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1209 | _PATH_NOLOGIN), "r"); | |
1210 | #else | |
1211 | if (pw->pw_uid) | |
1212 | f = fopen(_PATH_NOLOGIN, "r"); | |
1213 | #endif | |
1214 | if (f) { | |
1215 | /* /etc/nologin exists. Print its contents and exit. */ | |
bbe88b6d | 1216 | logit("User %.100s not allowed because %s exists", |
8bd4e2ae | 1217 | pw->pw_name, _PATH_NOLOGIN); |
f7342052 | 1218 | while (fgets(buf, sizeof(buf), f)) |
1219 | fputs(buf, stderr); | |
1220 | fclose(f); | |
99f4fb69 | 1221 | fflush(NULL); |
f7342052 | 1222 | exit(254); |
1223 | } | |
1224 | } | |
1225 | ||
1226 | /* Set login name, uid, gid, and groups. */ | |
1853d1ef | 1227 | void |
f7342052 | 1228 | do_setusercontext(struct passwd *pw) |
1229 | { | |
2731632a | 1230 | #ifndef HAVE_CYGWIN |
1231 | if (getuid() == 0 || geteuid() == 0) | |
f7342052 | 1232 | #endif /* HAVE_CYGWIN */ |
2731632a | 1233 | { |
1234 | ||
8bbfc882 | 1235 | #ifdef HAVE_SETPCRED |
166baacc | 1236 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1237 | fatal("Failed to set process credentials"); | |
8bbfc882 | 1238 | #endif /* HAVE_SETPCRED */ |
f7342052 | 1239 | #ifdef HAVE_LOGIN_CAP |
2d199535 | 1240 | # ifdef __bsdi__ |
8695f9f7 | 1241 | setpgid(0, 0); |
2d199535 | 1242 | # endif |
f7342052 | 1243 | if (setusercontext(lc, pw, pw->pw_uid, |
1244 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1245 | perror("unable to set user context"); | |
1246 | exit(1); | |
1247 | } | |
1248 | #else | |
1249 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1250 | /* Sets login uid for accounting */ | |
1251 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1252 | error("setluid: %s", strerror(errno)); | |
1253 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1254 | ||
1255 | if (setlogin(pw->pw_name) < 0) | |
1256 | error("setlogin failed: %s", strerror(errno)); | |
1257 | if (setgid(pw->pw_gid) < 0) { | |
1258 | perror("setgid"); | |
1259 | exit(1); | |
1260 | } | |
1261 | /* Initialize the group list. */ | |
1262 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1263 | perror("initgroups"); | |
1264 | exit(1); | |
1265 | } | |
1266 | endgrent(); | |
1267 | # ifdef USE_PAM | |
1268 | /* | |
1269 | * PAM credentials may take the form of supplementary groups. | |
1270 | * These will have been wiped by the above initgroups() call. | |
1271 | * Reestablish them here. | |
1272 | */ | |
49e82bb9 | 1273 | if (options.use_pam) { |
1274 | do_pam_session(); | |
7fceb20d | 1275 | do_pam_setcred(0); |
49e82bb9 | 1276 | } |
f7342052 | 1277 | # endif /* USE_PAM */ |
1278 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1279 | irix_setusercontext(pw); | |
1280 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
e2bc41f9 | 1281 | # ifdef _AIX |
0ba40daa | 1282 | aix_usrinfo(pw); |
e2bc41f9 | 1283 | # endif /* _AIX */ |
f7342052 | 1284 | /* Permanently switch to the desired uid. */ |
1285 | permanently_set_uid(pw); | |
1286 | #endif | |
1287 | } | |
2731632a | 1288 | |
1289 | #ifdef HAVE_CYGWIN | |
1290 | if (is_winnt) | |
1291 | #endif | |
f7342052 | 1292 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1293 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1294 | } | |
1295 | ||
51aeb639 | 1296 | static void |
1853d1ef | 1297 | launch_login(struct passwd *pw, const char *hostname) |
1298 | { | |
1299 | /* Launch login(1). */ | |
1300 | ||
85cc9118 | 1301 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1302 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1303 | (s->term ? s->term : "unknown"), |
1853d1ef | 1304 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1305 | #ifdef LOGIN_NO_ENDOPT |
1306 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1307 | #else | |
1853d1ef | 1308 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1309 | #endif |
1853d1ef | 1310 | |
1311 | /* Login couldn't be executed, die. */ | |
1312 | ||
1313 | perror("login"); | |
1314 | exit(1); | |
1315 | } | |
1316 | ||
f7342052 | 1317 | /* |
1318 | * Performs common processing for the child, such as setting up the | |
1319 | * environment, closing extra file descriptors, setting the user and group | |
1320 | * ids, and executing the command or shell. | |
1321 | */ | |
1322 | void | |
1323 | do_child(Session *s, const char *command) | |
1324 | { | |
1325 | extern char **environ; | |
1326 | char **env; | |
1327 | char *argv[10]; | |
1328 | const char *shell, *shell0, *hostname = NULL; | |
1329 | struct passwd *pw = s->pw; | |
1330 | u_int i; | |
1331 | ||
1332 | /* remove hostkey from the child's memory */ | |
1333 | destroy_sensitive_data(); | |
1334 | ||
1335 | /* login(1) is only called if we execute the login shell */ | |
1336 | if (options.use_login && command != NULL) | |
1337 | options.use_login = 0; | |
1338 | ||
ef51930f | 1339 | #ifdef _UNICOS |
1340 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1341 | #endif /* _UNICOS */ | |
1342 | ||
f7342052 | 1343 | /* |
1344 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1345 | * switch, so we let login(1) to this for us. | |
1346 | */ | |
1347 | if (!options.use_login) { | |
1348 | #ifdef HAVE_OSF_SIA | |
58d0df4e | 1349 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
f7342052 | 1350 | if (!check_quietlogin(s, command)) |
1351 | do_motd(); | |
1352 | #else /* HAVE_OSF_SIA */ | |
1353 | do_nologin(pw); | |
1354 | do_setusercontext(pw); | |
1355 | #endif /* HAVE_OSF_SIA */ | |
1356 | } | |
1357 | ||
1358 | /* | |
1359 | * Get the shell from the password data. An empty shell field is | |
1360 | * legal, and means /bin/sh. | |
1361 | */ | |
1362 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
32214c88 | 1363 | |
1364 | /* | |
1365 | * Make sure $SHELL points to the shell from the password file, | |
1366 | * even if shell is overridden from login.conf | |
1367 | */ | |
1368 | env = do_setup_env(s, shell); | |
1369 | ||
f7342052 | 1370 | #ifdef HAVE_LOGIN_CAP |
1371 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1372 | #endif | |
1373 | ||
2e73a022 | 1374 | /* we have to stash the hostname before we close our socket. */ |
1375 | if (options.use_login) | |
46e3af7f | 1376 | hostname = get_remote_name_or_ip(utmp_len, |
c5a7d788 | 1377 | options.use_dns); |
7368a6c8 | 1378 | /* |
1379 | * Close the connection descriptors; note that this is the child, and | |
1380 | * the server will still have the socket open, and it is important | |
1381 | * that we do not shutdown it. Note that the descriptors cannot be | |
1382 | * closed before building the environment, as we call | |
1383 | * get_remote_ipaddr there. | |
1384 | */ | |
1385 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1386 | close(packet_get_connection_in()); | |
1387 | else { | |
1388 | close(packet_get_connection_in()); | |
1389 | close(packet_get_connection_out()); | |
1390 | } | |
1391 | /* | |
1392 | * Close all descriptors related to channels. They will still remain | |
1393 | * open in the parent. | |
1394 | */ | |
1395 | /* XXX better use close-on-exec? -markus */ | |
1396 | channel_close_all(); | |
1397 | ||
1398 | /* | |
1399 | * Close any extra file descriptors. Note that there may still be | |
1400 | * descriptors left by system functions. They will be closed later. | |
1401 | */ | |
1402 | endpwent(); | |
1403 | ||
1404 | /* | |
1405 | * Close any extra open file descriptors so that we don\'t have them | |
1406 | * hanging around in clients. Note that we want to do this after | |
1407 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1408 | * descriptors open. | |
1409 | */ | |
1410 | for (i = 3; i < 64; i++) | |
1411 | close(i); | |
1412 | ||
7368a6c8 | 1413 | /* |
2a8a6488 | 1414 | * Must take new environment into use so that .ssh/rc, |
1415 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1416 | */ |
1417 | environ = env; | |
1418 | ||
dab89049 | 1419 | /* Change current directory to the user\'s home directory. */ |
1420 | if (chdir(pw->pw_dir) < 0) { | |
1421 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1422 | pw->pw_dir, strerror(errno)); | |
1423 | #ifdef HAVE_LOGIN_CAP | |
1424 | if (login_getcapbool(lc, "requirehome", 0)) | |
1425 | exit(1); | |
1426 | #endif | |
1427 | } | |
1428 | ||
f7342052 | 1429 | if (!options.use_login) |
1430 | do_rc_files(s, shell); | |
1d3c30db | 1431 | |
1432 | /* restore SIGPIPE for child */ | |
1433 | signal(SIGPIPE, SIG_DFL); | |
1434 | ||
f7342052 | 1435 | if (options.use_login) { |
1853d1ef | 1436 | launch_login(pw, hostname); |
1437 | /* NEVERREACHED */ | |
f7342052 | 1438 | } |
1439 | ||
1440 | /* Get the last component of the shell name. */ | |
1441 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1442 | shell0++; | |
1443 | else | |
1444 | shell0 = shell; | |
1445 | ||
7368a6c8 | 1446 | /* |
1447 | * If we have no command, execute the shell. In this case, the shell | |
1448 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1449 | * this is a login shell. | |
1450 | */ | |
1451 | if (!command) { | |
f7342052 | 1452 | char argv0[256]; |
7368a6c8 | 1453 | |
f7342052 | 1454 | /* Start the shell. Set initial character to '-'. */ |
1455 | argv0[0] = '-'; | |
7368a6c8 | 1456 | |
f7342052 | 1457 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1458 | >= sizeof(argv0) - 1) { | |
1459 | errno = EINVAL; | |
7368a6c8 | 1460 | perror(shell); |
1461 | exit(1); | |
f7342052 | 1462 | } |
7368a6c8 | 1463 | |
f7342052 | 1464 | /* Execute the shell. */ |
1465 | argv[0] = argv0; | |
1466 | argv[1] = NULL; | |
1467 | execve(shell, argv, env); | |
7368a6c8 | 1468 | |
f7342052 | 1469 | /* Executing the shell failed. */ |
1470 | perror(shell); | |
1471 | exit(1); | |
7368a6c8 | 1472 | } |
1473 | /* | |
1474 | * Execute the command using the user's shell. This uses the -c | |
1475 | * option to execute the command. | |
1476 | */ | |
f7342052 | 1477 | argv[0] = (char *) shell0; |
7368a6c8 | 1478 | argv[1] = "-c"; |
1479 | argv[2] = (char *) command; | |
1480 | argv[3] = NULL; | |
1481 | execve(shell, argv, env); | |
1482 | perror(shell); | |
1483 | exit(1); | |
1484 | } | |
1485 | ||
1486 | Session * | |
1487 | session_new(void) | |
1488 | { | |
1489 | int i; | |
1490 | static int did_init = 0; | |
1491 | if (!did_init) { | |
1492 | debug("session_new: init"); | |
184eed6a | 1493 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1494 | sessions[i].used = 0; |
7368a6c8 | 1495 | } |
1496 | did_init = 1; | |
1497 | } | |
184eed6a | 1498 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1499 | Session *s = &sessions[i]; |
1500 | if (! s->used) { | |
690d0d7f | 1501 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1502 | s->chanid = -1; |
1503 | s->ptyfd = -1; | |
1504 | s->ttyfd = -1; | |
7368a6c8 | 1505 | s->used = 1; |
86066315 | 1506 | s->self = i; |
02323c45 | 1507 | debug("session_new: session %d", i); |
7368a6c8 | 1508 | return s; |
1509 | } | |
1510 | } | |
1511 | return NULL; | |
1512 | } | |
1513 | ||
396c147e | 1514 | static void |
7368a6c8 | 1515 | session_dump(void) |
1516 | { | |
1517 | int i; | |
184eed6a | 1518 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1519 | Session *s = &sessions[i]; |
c457707e | 1520 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1521 | s->used, |
1522 | s->self, | |
1523 | s, | |
1524 | s->chanid, | |
c457707e | 1525 | (long)s->pid); |
7368a6c8 | 1526 | } |
1527 | } | |
1528 | ||
e78a59f5 | 1529 | int |
57156994 | 1530 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1531 | { |
1532 | Session *s = session_new(); | |
1533 | debug("session_open: channel %d", chanid); | |
1534 | if (s == NULL) { | |
1535 | error("no more sessions"); | |
1536 | return 0; | |
1537 | } | |
57156994 | 1538 | s->authctxt = authctxt; |
1539 | s->pw = authctxt->pw; | |
fdaef11e | 1540 | if (s->pw == NULL || !authctxt->valid) |
0725ea77 | 1541 | fatal("no user for session %d", s->self); |
0b242b12 | 1542 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1543 | s->chanid = chanid; | |
e78a59f5 | 1544 | return 1; |
1545 | } | |
1546 | ||
1853d1ef | 1547 | Session * |
1548 | session_by_tty(char *tty) | |
1549 | { | |
1550 | int i; | |
1551 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1552 | Session *s = &sessions[i]; | |
1553 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1554 | debug("session_by_tty: session %d tty %s", i, tty); | |
1555 | return s; | |
1556 | } | |
1557 | } | |
1558 | debug("session_by_tty: unknown tty %.100s", tty); | |
1559 | session_dump(); | |
1560 | return NULL; | |
1561 | } | |
1562 | ||
396c147e | 1563 | static Session * |
e78a59f5 | 1564 | session_by_channel(int id) |
1565 | { | |
1566 | int i; | |
184eed6a | 1567 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1568 | Session *s = &sessions[i]; |
1569 | if (s->used && s->chanid == id) { | |
1570 | debug("session_by_channel: session %d channel %d", i, id); | |
1571 | return s; | |
1572 | } | |
1573 | } | |
1574 | debug("session_by_channel: unknown channel %d", id); | |
1575 | session_dump(); | |
1576 | return NULL; | |
1577 | } | |
1578 | ||
396c147e | 1579 | static Session * |
e78a59f5 | 1580 | session_by_pid(pid_t pid) |
1581 | { | |
1582 | int i; | |
c457707e | 1583 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1584 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1585 | Session *s = &sessions[i]; |
1586 | if (s->used && s->pid == pid) | |
1587 | return s; | |
1588 | } | |
c457707e | 1589 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1590 | session_dump(); |
1591 | return NULL; | |
1592 | } | |
1593 | ||
396c147e | 1594 | static int |
e78a59f5 | 1595 | session_window_change_req(Session *s) |
1596 | { | |
1597 | s->col = packet_get_int(); | |
1598 | s->row = packet_get_int(); | |
1599 | s->xpixel = packet_get_int(); | |
1600 | s->ypixel = packet_get_int(); | |
95500969 | 1601 | packet_check_eom(); |
e78a59f5 | 1602 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1603 | return 1; | |
1604 | } | |
1605 | ||
396c147e | 1606 | static int |
e78a59f5 | 1607 | session_pty_req(Session *s) |
1608 | { | |
1e3b8b07 | 1609 | u_int len; |
30dcc918 | 1610 | int n_bytes; |
762715ce | 1611 | |
653d5f86 | 1612 | if (no_pty_flag) { |
1613 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1614 | return 0; |
653d5f86 | 1615 | } |
1616 | if (s->ttyfd != -1) { | |
1617 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1618 | return 0; |
653d5f86 | 1619 | } |
ffbf7323 | 1620 | /* Get the time and hostname when the user last logged in. */ |
1621 | if (options.print_lastlog) { | |
1622 | s->hostname[0] = '\0'; | |
1623 | s->last_login_time = get_last_login_time(s->pw->pw_uid, | |
1624 | s->pw->pw_name, s->hostname, sizeof(s->hostname)); | |
1625 | } | |
653d5f86 | 1626 | |
e78a59f5 | 1627 | s->term = packet_get_string(&len); |
653d5f86 | 1628 | |
1629 | if (compat20) { | |
1630 | s->col = packet_get_int(); | |
1631 | s->row = packet_get_int(); | |
1632 | } else { | |
1633 | s->row = packet_get_int(); | |
1634 | s->col = packet_get_int(); | |
1635 | } | |
e78a59f5 | 1636 | s->xpixel = packet_get_int(); |
1637 | s->ypixel = packet_get_int(); | |
1638 | ||
1639 | if (strcmp(s->term, "") == 0) { | |
1640 | xfree(s->term); | |
1641 | s->term = NULL; | |
1642 | } | |
653d5f86 | 1643 | |
e78a59f5 | 1644 | /* Allocate a pty and open it. */ |
653d5f86 | 1645 | debug("Allocating pty."); |
1853d1ef | 1646 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1647 | if (s->term) |
1648 | xfree(s->term); | |
e78a59f5 | 1649 | s->term = NULL; |
1650 | s->ptyfd = -1; | |
1651 | s->ttyfd = -1; | |
1652 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1653 | return 0; |
e78a59f5 | 1654 | } |
1655 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1656 | |
1657 | /* for SSH1 the tty modes length is not given */ | |
1658 | if (!compat20) | |
1659 | n_bytes = packet_remaining(); | |
1660 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1661 | ||
1853d1ef | 1662 | if (!use_privsep) |
1663 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1664 | |
1665 | /* Set window size from the packet. */ | |
e78a59f5 | 1666 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1667 | ||
95500969 | 1668 | packet_check_eom(); |
1d1ffb87 | 1669 | session_proctitle(s); |
e78a59f5 | 1670 | return 1; |
1671 | } | |
1672 | ||
396c147e | 1673 | static int |
0b242b12 | 1674 | session_subsystem_req(Session *s) |
1675 | { | |
01855277 | 1676 | struct stat st; |
1e3b8b07 | 1677 | u_int len; |
0b242b12 | 1678 | int success = 0; |
01855277 | 1679 | char *cmd, *subsys = packet_get_string(&len); |
38c295d6 | 1680 | int i; |
0b242b12 | 1681 | |
95500969 | 1682 | packet_check_eom(); |
bbe88b6d | 1683 | logit("subsystem request for %.100s", subsys); |
0b242b12 | 1684 | |
38c295d6 | 1685 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1686 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
1687 | cmd = options.subsystem_command[i]; | |
1688 | if (stat(cmd, &st) < 0) { | |
1689 | error("subsystem: cannot stat %s: %s", cmd, | |
1690 | strerror(errno)); | |
1691 | break; | |
1692 | } | |
1693 | debug("subsystem: exec() %s", cmd); | |
e5d7a405 | 1694 | s->is_subsystem = 1; |
01855277 | 1695 | do_exec(s, cmd); |
38c295d6 | 1696 | success = 1; |
24932ee9 | 1697 | break; |
38c295d6 | 1698 | } |
1699 | } | |
1700 | ||
1701 | if (!success) | |
bbe88b6d | 1702 | logit("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1703 | subsys); |
38c295d6 | 1704 | |
0b242b12 | 1705 | xfree(subsys); |
1706 | return success; | |
1707 | } | |
1708 | ||
396c147e | 1709 | static int |
0b242b12 | 1710 | session_x11_req(Session *s) |
1711 | { | |
8dcd9d5c | 1712 | int success; |
0b242b12 | 1713 | |
1714 | s->single_connection = packet_get_char(); | |
1715 | s->auth_proto = packet_get_string(NULL); | |
1716 | s->auth_data = packet_get_string(NULL); | |
1717 | s->screen = packet_get_int(); | |
95500969 | 1718 | packet_check_eom(); |
0b242b12 | 1719 | |
8dcd9d5c | 1720 | success = session_setup_x11fwd(s); |
1721 | if (!success) { | |
0b242b12 | 1722 | xfree(s->auth_proto); |
1723 | xfree(s->auth_data); | |
1500bcdd | 1724 | s->auth_proto = NULL; |
1725 | s->auth_data = NULL; | |
0b242b12 | 1726 | } |
8dcd9d5c | 1727 | return success; |
0b242b12 | 1728 | } |
1729 | ||
396c147e | 1730 | static int |
38c295d6 | 1731 | session_shell_req(Session *s) |
1732 | { | |
95500969 | 1733 | packet_check_eom(); |
dac6753b | 1734 | do_exec(s, NULL); |
38c295d6 | 1735 | return 1; |
1736 | } | |
1737 | ||
396c147e | 1738 | static int |
38c295d6 | 1739 | session_exec_req(Session *s) |
1740 | { | |
1e3b8b07 | 1741 | u_int len; |
38c295d6 | 1742 | char *command = packet_get_string(&len); |
95500969 | 1743 | packet_check_eom(); |
dac6753b | 1744 | do_exec(s, command); |
c95add71 | 1745 | xfree(command); |
38c295d6 | 1746 | return 1; |
1747 | } | |
1748 | ||
16a79097 | 1749 | static int |
1750 | session_break_req(Session *s) | |
1751 | { | |
1752 | u_int break_length; | |
1753 | ||
8168a86a | 1754 | break_length = packet_get_int(); /* ignored */ |
16a79097 | 1755 | packet_check_eom(); |
1756 | ||
8168a86a | 1757 | if (s->ttyfd == -1 || |
1758 | tcsendbreak(s->ttyfd, 0) < 0) | |
16a79097 | 1759 | return 0; |
16a79097 | 1760 | return 1; |
1761 | } | |
1762 | ||
396c147e | 1763 | static int |
fa08c86b | 1764 | session_auth_agent_req(Session *s) |
1765 | { | |
1766 | static int called = 0; | |
95500969 | 1767 | packet_check_eom(); |
d343d900 | 1768 | if (no_agent_forwarding_flag) { |
1769 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1770 | return 0; | |
1771 | } | |
fa08c86b | 1772 | if (called) { |
1773 | return 0; | |
1774 | } else { | |
1775 | called = 1; | |
1776 | return auth_input_request_forwarding(s->pw); | |
1777 | } | |
1778 | } | |
1779 | ||
7899c98f | 1780 | int |
1781 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 1782 | { |
e78a59f5 | 1783 | int success = 0; |
e78a59f5 | 1784 | Session *s; |
e78a59f5 | 1785 | |
7899c98f | 1786 | if ((s = session_by_channel(c->self)) == NULL) { |
bbe88b6d | 1787 | logit("session_input_channel_req: no session %d req %.100s", |
7899c98f | 1788 | c->self, rtype); |
1789 | return 0; | |
1790 | } | |
1791 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 1792 | |
1793 | /* | |
e5d7a405 | 1794 | * a session is in LARVAL state until a shell, a command |
1795 | * or a subsystem is executed | |
e78a59f5 | 1796 | */ |
1797 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1798 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1799 | success = session_shell_req(s); |
e78a59f5 | 1800 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1801 | success = session_exec_req(s); |
e78a59f5 | 1802 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1803 | success = session_pty_req(s); |
0b242b12 | 1804 | } else if (strcmp(rtype, "x11-req") == 0) { |
1805 | success = session_x11_req(s); | |
fa08c86b | 1806 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1807 | success = session_auth_agent_req(s); | |
0b242b12 | 1808 | } else if (strcmp(rtype, "subsystem") == 0) { |
1809 | success = session_subsystem_req(s); | |
16a79097 | 1810 | } else if (strcmp(rtype, "break") == 0) { |
1811 | success = session_break_req(s); | |
e78a59f5 | 1812 | } |
1813 | } | |
1814 | if (strcmp(rtype, "window-change") == 0) { | |
1815 | success = session_window_change_req(s); | |
1816 | } | |
7899c98f | 1817 | return success; |
e78a59f5 | 1818 | } |
1819 | ||
1820 | void | |
1821 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1822 | { | |
1823 | if (!compat20) | |
1824 | fatal("session_set_fds: called for proto != 2.0"); | |
1825 | /* | |
1826 | * now that have a child and a pipe to the child, | |
1827 | * we can activate our channel and register the fd's | |
1828 | */ | |
1829 | if (s->chanid == -1) | |
1830 | fatal("no channel for session %d", s->self); | |
1831 | channel_set_fds(s->chanid, | |
1832 | fdout, fdin, fderr, | |
a22aff1f | 1833 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 1834 | 1, |
1835 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 1836 | } |
1837 | ||
86066315 | 1838 | /* |
1839 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
1840 | * (e.g., due to a dropped connection). | |
1841 | */ | |
1853d1ef | 1842 | void |
2362db19 | 1843 | session_pty_cleanup2(Session *s) |
7368a6c8 | 1844 | { |
86066315 | 1845 | if (s == NULL) { |
1846 | error("session_pty_cleanup: no session"); | |
1847 | return; | |
1848 | } | |
1849 | if (s->ttyfd == -1) | |
7368a6c8 | 1850 | return; |
1851 | ||
0725ea77 | 1852 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 1853 | |
7368a6c8 | 1854 | /* Record that the user has logged out. */ |
86066315 | 1855 | if (s->pid != 0) |
f3837bc6 | 1856 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 1857 | |
1858 | /* Release the pseudo-tty. */ | |
1853d1ef | 1859 | if (getuid() == 0) |
1860 | pty_release(s->tty); | |
7368a6c8 | 1861 | |
1862 | /* | |
1863 | * Close the server side of the socket pairs. We must do this after | |
1864 | * the pty cleanup, so that another process doesn't get this pty | |
1865 | * while we're still cleaning up. | |
1866 | */ | |
1867 | if (close(s->ptymaster) < 0) | |
1853d1ef | 1868 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 1869 | |
1870 | /* unlink pty from session */ | |
1871 | s->ttyfd = -1; | |
7368a6c8 | 1872 | } |
e78a59f5 | 1873 | |
1853d1ef | 1874 | void |
2362db19 | 1875 | session_pty_cleanup(Session *s) |
1853d1ef | 1876 | { |
2362db19 | 1877 | PRIVSEP(session_pty_cleanup2(s)); |
1853d1ef | 1878 | } |
1879 | ||
6c723e7c | 1880 | static char * |
1881 | sig2name(int sig) | |
1882 | { | |
1883 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
1884 | SSH_SIG(ABRT); | |
1885 | SSH_SIG(ALRM); | |
1886 | SSH_SIG(FPE); | |
1887 | SSH_SIG(HUP); | |
1888 | SSH_SIG(ILL); | |
1889 | SSH_SIG(INT); | |
1890 | SSH_SIG(KILL); | |
1891 | SSH_SIG(PIPE); | |
1892 | SSH_SIG(QUIT); | |
1893 | SSH_SIG(SEGV); | |
1894 | SSH_SIG(TERM); | |
1895 | SSH_SIG(USR1); | |
1896 | SSH_SIG(USR2); | |
1897 | #undef SSH_SIG | |
1898 | return "SIG@openssh.com"; | |
1899 | } | |
1900 | ||
396c147e | 1901 | static void |
e78a59f5 | 1902 | session_exit_message(Session *s, int status) |
1903 | { | |
1904 | Channel *c; | |
5a4ae906 | 1905 | |
1906 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 1907 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 1908 | s->self, s->chanid); |
c457707e | 1909 | debug("session_exit_message: session %d channel %d pid %ld", |
1910 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 1911 | |
1912 | if (WIFEXITED(status)) { | |
5a4ae906 | 1913 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 1914 | packet_put_int(WEXITSTATUS(status)); |
1915 | packet_send(); | |
1916 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 1917 | channel_request_start(s->chanid, "exit-signal", 0); |
6c723e7c | 1918 | packet_put_cstring(sig2name(WTERMSIG(status))); |
a64009ad | 1919 | #ifdef WCOREDUMP |
e78a59f5 | 1920 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1921 | #else /* WCOREDUMP */ |
1922 | packet_put_char(0); | |
1923 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1924 | packet_put_cstring(""); |
1925 | packet_put_cstring(""); | |
1926 | packet_send(); | |
1927 | } else { | |
1928 | /* Some weird exit cause. Just exit. */ | |
1929 | packet_disconnect("wait returned status %04x.", status); | |
1930 | } | |
1931 | ||
1932 | /* disconnect channel */ | |
1933 | debug("session_exit_message: release channel %d", s->chanid); | |
1934 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1935 | /* |
1936 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1937 | * interested in data we write. | |
1938 | * Note that we must not call 'chan_read_failed', since there could | |
1939 | * be some more data waiting in the pipe. | |
1940 | */ | |
0b242b12 | 1941 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1942 | chan_write_failed(c); | |
e78a59f5 | 1943 | s->chanid = -1; |
1944 | } | |
1945 | ||
1853d1ef | 1946 | void |
86066315 | 1947 | session_close(Session *s) |
e78a59f5 | 1948 | { |
c457707e | 1949 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
2362db19 | 1950 | if (s->ttyfd != -1) |
86066315 | 1951 | session_pty_cleanup(s); |
e78a59f5 | 1952 | if (s->term) |
1953 | xfree(s->term); | |
1954 | if (s->display) | |
1955 | xfree(s->display); | |
f9314d9a | 1956 | if (s->auth_display) |
1957 | xfree(s->auth_display); | |
e78a59f5 | 1958 | if (s->auth_data) |
1959 | xfree(s->auth_data); | |
1960 | if (s->auth_proto) | |
1961 | xfree(s->auth_proto); | |
1962 | s->used = 0; | |
1d1ffb87 | 1963 | session_proctitle(s); |
e78a59f5 | 1964 | } |
1965 | ||
1966 | void | |
1967 | session_close_by_pid(pid_t pid, int status) | |
1968 | { | |
1969 | Session *s = session_by_pid(pid); | |
1970 | if (s == NULL) { | |
c457707e | 1971 | debug("session_close_by_pid: no session for pid %ld", |
1972 | (long)pid); | |
e78a59f5 | 1973 | return; |
1974 | } | |
1975 | if (s->chanid != -1) | |
1976 | session_exit_message(s, status); | |
1977 | session_close(s); | |
1978 | } | |
1979 | ||
1980 | /* | |
1981 | * this is called when a channel dies before | |
1982 | * the session 'child' itself dies | |
1983 | */ | |
1984 | void | |
1985 | session_close_by_channel(int id, void *arg) | |
1986 | { | |
1987 | Session *s = session_by_channel(id); | |
1988 | if (s == NULL) { | |
418e724c | 1989 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 1990 | return; |
1991 | } | |
c457707e | 1992 | debug("session_close_by_channel: channel %d child %ld", |
1993 | id, (long)s->pid); | |
d5f24f94 | 1994 | if (s->pid != 0) { |
418e724c | 1995 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 1996 | /* |
1997 | * delay detach of session, but release pty, since | |
1998 | * the fd's to the child are already closed | |
1999 | */ | |
2362db19 | 2000 | if (s->ttyfd != -1) |
efcc9957 | 2001 | session_pty_cleanup(s); |
418e724c | 2002 | return; |
e78a59f5 | 2003 | } |
418e724c | 2004 | /* detach by removing callback */ |
2005 | channel_cancel_cleanup(s->chanid); | |
2006 | s->chanid = -1; | |
d5f24f94 | 2007 | session_close(s); |
2008 | } | |
2009 | ||
2010 | void | |
1853d1ef | 2011 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 2012 | { |
2013 | int i; | |
184eed6a | 2014 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 2015 | Session *s = &sessions[i]; |
1853d1ef | 2016 | if (s->used) { |
2017 | if (closefunc != NULL) | |
2018 | closefunc(s); | |
2019 | else | |
2020 | session_close(s); | |
2021 | } | |
d5f24f94 | 2022 | } |
e78a59f5 | 2023 | } |
2024 | ||
396c147e | 2025 | static char * |
1d1ffb87 | 2026 | session_tty_list(void) |
2027 | { | |
2028 | static char buf[1024]; | |
2029 | int i; | |
d0104542 | 2030 | char *cp; |
2031 | ||
1d1ffb87 | 2032 | buf[0] = '\0'; |
184eed6a | 2033 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 2034 | Session *s = &sessions[i]; |
2035 | if (s->used && s->ttyfd != -1) { | |
d0104542 | 2036 | |
2037 | if (strncmp(s->tty, "/dev/", 5) != 0) { | |
2038 | cp = strrchr(s->tty, '/'); | |
2039 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2040 | } else | |
2041 | cp = s->tty + 5; | |
2042 | ||
1d1ffb87 | 2043 | if (buf[0] != '\0') |
2044 | strlcat(buf, ",", sizeof buf); | |
d0104542 | 2045 | strlcat(buf, cp, sizeof buf); |
1d1ffb87 | 2046 | } |
2047 | } | |
2048 | if (buf[0] == '\0') | |
2049 | strlcpy(buf, "notty", sizeof buf); | |
2050 | return buf; | |
2051 | } | |
2052 | ||
2053 | void | |
2054 | session_proctitle(Session *s) | |
2055 | { | |
2056 | if (s->pw == NULL) | |
2057 | error("no user for session %d", s->self); | |
2058 | else | |
2059 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2060 | } | |
2061 | ||
8dcd9d5c | 2062 | int |
2063 | session_setup_x11fwd(Session *s) | |
2064 | { | |
8dcd9d5c | 2065 | struct stat st; |
c9d0ad9b | 2066 | char display[512], auth_display[512]; |
2067 | char hostname[MAXHOSTNAMELEN]; | |
8dcd9d5c | 2068 | |
2069 | if (no_x11_forwarding_flag) { | |
2070 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2071 | return 0; | |
2072 | } | |
2073 | if (!options.x11_forwarding) { | |
2074 | debug("X11 forwarding disabled in server configuration file."); | |
2075 | return 0; | |
2076 | } | |
2077 | if (!options.xauth_location || | |
2078 | (stat(options.xauth_location, &st) == -1)) { | |
2079 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2080 | return 0; | |
2081 | } | |
ff027d84 | 2082 | if (options.use_login) { |
2083 | packet_send_debug("X11 forwarding disabled; " | |
2084 | "not compatible with UseLogin=yes."); | |
2085 | return 0; | |
2086 | } | |
b44de2b1 | 2087 | if (s->display != NULL) { |
8dcd9d5c | 2088 | debug("X11 display already set."); |
2089 | return 0; | |
2090 | } | |
57f228e8 | 2091 | if (x11_create_display_inet(options.x11_display_offset, |
2092 | options.x11_use_localhost, s->single_connection, | |
2093 | &s->display_number) == -1) { | |
b44de2b1 | 2094 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 2095 | return 0; |
2096 | } | |
c9d0ad9b | 2097 | |
2098 | /* Set up a suitable value for the DISPLAY variable. */ | |
2099 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2100 | fatal("gethostname: %.100s", strerror(errno)); | |
2101 | /* | |
2102 | * auth_display must be used as the displayname when the | |
2103 | * authorization entry is added with xauth(1). This will be | |
2104 | * different than the DISPLAY string for localhost displays. | |
2105 | */ | |
e6e573bd | 2106 | if (options.x11_use_localhost) { |
57f228e8 | 2107 | snprintf(display, sizeof display, "localhost:%u.%u", |
c9d0ad9b | 2108 | s->display_number, s->screen); |
57f228e8 | 2109 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
f9314d9a | 2110 | s->display_number, s->screen); |
c9d0ad9b | 2111 | s->display = xstrdup(display); |
f9314d9a | 2112 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 2113 | } else { |
2114 | #ifdef IPADDR_IN_DISPLAY | |
2115 | struct hostent *he; | |
2116 | struct in_addr my_addr; | |
2117 | ||
2118 | he = gethostbyname(hostname); | |
2119 | if (he == NULL) { | |
2120 | error("Can't get IP address for X11 DISPLAY."); | |
2121 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2122 | return 0; | |
2123 | } | |
2124 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
57f228e8 | 2125 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
c9d0ad9b | 2126 | s->display_number, s->screen); |
2127 | #else | |
57f228e8 | 2128 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
c9d0ad9b | 2129 | s->display_number, s->screen); |
2130 | #endif | |
2131 | s->display = xstrdup(display); | |
f9314d9a | 2132 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2133 | } |
2134 | ||
8dcd9d5c | 2135 | return 1; |
2136 | } | |
2137 | ||
396c147e | 2138 | static void |
59c97189 | 2139 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2140 | { |
57156994 | 2141 | server_loop2(authctxt); |
2362db19 | 2142 | } |
2143 | ||
2144 | void | |
2145 | do_cleanup(Authctxt *authctxt) | |
2146 | { | |
2147 | static int called = 0; | |
2148 | ||
2149 | debug("do_cleanup"); | |
2150 | ||
2151 | /* no cleanup if we're in the child for login shell */ | |
2152 | if (is_child) | |
2153 | return; | |
2154 | ||
2155 | /* avoid double cleanup */ | |
2156 | if (called) | |
2157 | return; | |
2158 | called = 1; | |
2159 | ||
2160 | if (authctxt == NULL) | |
2161 | return; | |
2162 | #ifdef KRB5 | |
2163 | if (options.kerberos_ticket_cleanup && | |
2164 | authctxt->krb5_ctx) | |
2165 | krb5_cleanup_proc(authctxt); | |
7364bd04 | 2166 | #endif |
2362db19 | 2167 | |
2168 | #ifdef GSSAPI | |
2169 | if (compat20 && options.gss_cleanup_creds) | |
2170 | ssh_gssapi_cleanup_creds(); | |
2171 | #endif | |
2172 | ||
c6630044 | 2173 | #ifdef USE_PAM |
2174 | if (options.use_pam) { | |
2175 | sshpam_cleanup(); | |
2176 | sshpam_thread_cleanup(); | |
2177 | } | |
2178 | #endif | |
2179 | ||
2362db19 | 2180 | /* remove agent socket */ |
2181 | auth_sock_cleanup_proc(authctxt->pw); | |
2182 | ||
2183 | /* | |
2184 | * Cleanup ptys/utmp only if privsep is disabled, | |
2185 | * or if running in monitor. | |
2186 | */ | |
2187 | if (!use_privsep || mm_is_monitor()) | |
2188 | session_destroy_all(session_pty_cleanup2); | |
e78a59f5 | 2189 | } |