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3c0ef626 | 1 | /* |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
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 | * | |
11 | * SSH2 support by Markus Friedl. | |
12 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. | |
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. | |
33 | */ | |
34 | ||
35 | #include "includes.h" | |
665a873d | 36 | RCSID("$OpenBSD: session.c,v 1.186 2005/07/25 11:59:40 markus Exp $"); |
3c0ef626 | 37 | |
38 | #include "ssh.h" | |
39 | #include "ssh1.h" | |
40 | #include "ssh2.h" | |
41 | #include "xmalloc.h" | |
42 | #include "sshpty.h" | |
43 | #include "packet.h" | |
44 | #include "buffer.h" | |
c9f39d2c | 45 | #include "match.h" |
3c0ef626 | 46 | #include "uidswap.h" |
47 | #include "compat.h" | |
48 | #include "channels.h" | |
49 | #include "bufaux.h" | |
50 | #include "auth.h" | |
51 | #include "auth-options.h" | |
52 | #include "pathnames.h" | |
53 | #include "log.h" | |
54 | #include "servconf.h" | |
55 | #include "sshlogin.h" | |
56 | #include "serverloop.h" | |
57 | #include "canohost.h" | |
58 | #include "session.h" | |
665a873d | 59 | #include "kex.h" |
700318f3 | 60 | #include "monitor_wrap.h" |
3c0ef626 | 61 | |
cdd66111 | 62 | #if defined(KRB5) && defined(USE_AFS) |
63 | #include <kafs.h> | |
64 | #endif | |
65 | ||
0fff78ff | 66 | #ifdef GSSAPI |
67 | #include "ssh-gss.h" | |
3c0ef626 | 68 | #endif |
69 | ||
3c0ef626 | 70 | /* func */ |
71 | ||
72 | Session *session_new(void); | |
73 | void session_set_fds(Session *, int, int, int); | |
cdd66111 | 74 | void session_pty_cleanup(Session *); |
3c0ef626 | 75 | void session_proctitle(Session *); |
76 | int session_setup_x11fwd(Session *); | |
77 | void do_exec_pty(Session *, const char *); | |
78 | void do_exec_no_pty(Session *, const char *); | |
79 | void do_exec(Session *, const char *); | |
80 | void do_login(Session *, const char *); | |
81 | #ifdef LOGIN_NEEDS_UTMPX | |
82 | static void do_pre_login(Session *s); | |
83 | #endif | |
84 | void do_child(Session *, const char *); | |
85 | void do_motd(void); | |
86 | int check_quietlogin(Session *, const char *); | |
87 | ||
88 | static void do_authenticated1(Authctxt *); | |
89 | static void do_authenticated2(Authctxt *); | |
90 | ||
3c0ef626 | 91 | static int session_pty_req(Session *); |
92 | ||
93 | /* import */ | |
94 | extern ServerOptions options; | |
95 | extern char *__progname; | |
96 | extern int log_stderr; | |
97 | extern int debug_flag; | |
98 | extern u_int utmp_len; | |
99 | extern int startup_pipe; | |
100 | extern void destroy_sensitive_data(void); | |
0fff78ff | 101 | extern Buffer loginmsg; |
3c0ef626 | 102 | |
103 | /* original command from peer. */ | |
104 | const char *original_command = NULL; | |
105 | ||
106 | /* data */ | |
107 | #define MAX_SESSIONS 10 | |
108 | Session sessions[MAX_SESSIONS]; | |
109 | ||
3c0ef626 | 110 | #ifdef HAVE_LOGIN_CAP |
700318f3 | 111 | login_cap_t *lc; |
3c0ef626 | 112 | #endif |
113 | ||
cdd66111 | 114 | static int is_child = 0; |
115 | ||
f5799ae1 | 116 | /* Name and directory of socket for authentication agent forwarding. */ |
117 | static char *auth_sock_name = NULL; | |
118 | static char *auth_sock_dir = NULL; | |
119 | ||
120 | /* removes the agent forwarding socket */ | |
121 | ||
122 | static void | |
cdd66111 | 123 | auth_sock_cleanup_proc(struct passwd *pw) |
f5799ae1 | 124 | { |
f5799ae1 | 125 | if (auth_sock_name != NULL) { |
126 | temporarily_use_uid(pw); | |
127 | unlink(auth_sock_name); | |
128 | rmdir(auth_sock_dir); | |
129 | auth_sock_name = NULL; | |
130 | restore_uid(); | |
131 | } | |
132 | } | |
133 | ||
134 | static int | |
135 | auth_input_request_forwarding(struct passwd * pw) | |
136 | { | |
137 | Channel *nc; | |
138 | int sock; | |
139 | struct sockaddr_un sunaddr; | |
140 | ||
141 | if (auth_sock_name != NULL) { | |
142 | error("authentication forwarding requested twice."); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
147 | temporarily_use_uid(pw); | |
148 | ||
149 | /* Allocate a buffer for the socket name, and format the name. */ | |
150 | auth_sock_name = xmalloc(MAXPATHLEN); | |
151 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
cdd66111 | 152 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
f5799ae1 | 153 | |
154 | /* Create private directory for socket */ | |
155 | if (mkdtemp(auth_sock_dir) == NULL) { | |
156 | packet_send_debug("Agent forwarding disabled: " | |
157 | "mkdtemp() failed: %.100s", strerror(errno)); | |
158 | restore_uid(); | |
159 | xfree(auth_sock_name); | |
160 | xfree(auth_sock_dir); | |
161 | auth_sock_name = NULL; | |
162 | auth_sock_dir = NULL; | |
163 | return 0; | |
164 | } | |
165 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", | |
166 | auth_sock_dir, (long) getpid()); | |
167 | ||
f5799ae1 | 168 | /* Create the socket. */ |
169 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
170 | if (sock < 0) | |
171 | packet_disconnect("socket: %.100s", strerror(errno)); | |
172 | ||
173 | /* Bind it to the name. */ | |
174 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
175 | sunaddr.sun_family = AF_UNIX; | |
176 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
177 | ||
178 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
179 | packet_disconnect("bind: %.100s", strerror(errno)); | |
180 | ||
181 | /* Restore the privileged uid. */ | |
182 | restore_uid(); | |
183 | ||
184 | /* Start listening on the socket. */ | |
cdd66111 | 185 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
f5799ae1 | 186 | packet_disconnect("listen: %.100s", strerror(errno)); |
187 | ||
188 | /* Allocate a channel for the authentication agent socket. */ | |
189 | nc = channel_new("auth socket", | |
190 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
191 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0fff78ff | 192 | 0, "auth socket", 1); |
f5799ae1 | 193 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
194 | return 1; | |
195 | } | |
196 | ||
cdd66111 | 197 | static void |
198 | display_loginmsg(void) | |
199 | { | |
665a873d | 200 | if (buffer_len(&loginmsg) > 0) { |
201 | buffer_append(&loginmsg, "\0", 1); | |
202 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
203 | buffer_clear(&loginmsg); | |
204 | } | |
cdd66111 | 205 | } |
f5799ae1 | 206 | |
3c0ef626 | 207 | void |
208 | do_authenticated(Authctxt *authctxt) | |
209 | { | |
6a9b3198 | 210 | setproctitle("%s", authctxt->pw->pw_name); |
211 | ||
3c0ef626 | 212 | /* |
213 | * Cancel the alarm we set to limit the time taken for | |
214 | * authentication. | |
215 | */ | |
216 | alarm(0); | |
217 | if (startup_pipe != -1) { | |
218 | close(startup_pipe); | |
219 | startup_pipe = -1; | |
220 | } | |
3c0ef626 | 221 | /* setup the channel layer */ |
222 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
223 | channel_permit_all_opens(); | |
224 | ||
225 | if (compat20) | |
226 | do_authenticated2(authctxt); | |
227 | else | |
228 | do_authenticated1(authctxt); | |
229 | ||
cdd66111 | 230 | do_cleanup(authctxt); |
3c0ef626 | 231 | } |
232 | ||
233 | /* | |
234 | * Prepares for an interactive session. This is called after the user has | |
235 | * been successfully authenticated. During this message exchange, pseudo | |
236 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
237 | * are requested, etc. | |
238 | */ | |
239 | static void | |
240 | do_authenticated1(Authctxt *authctxt) | |
241 | { | |
242 | Session *s; | |
243 | char *command; | |
e9a17296 | 244 | int success, type, screen_flag; |
680cee3b | 245 | int enable_compression_after_reply = 0; |
246 | u_int proto_len, data_len, dlen, compression_level = 0; | |
3c0ef626 | 247 | |
248 | s = session_new(); | |
996d5e62 | 249 | if (s == NULL) { |
250 | error("no more sessions"); | |
251 | return; | |
252 | } | |
3c0ef626 | 253 | s->authctxt = authctxt; |
254 | s->pw = authctxt->pw; | |
255 | ||
256 | /* | |
257 | * We stay in this loop until the client requests to execute a shell | |
258 | * or a command. | |
259 | */ | |
260 | for (;;) { | |
261 | success = 0; | |
262 | ||
263 | /* Get a packet from the client. */ | |
e9a17296 | 264 | type = packet_read(); |
3c0ef626 | 265 | |
266 | /* Process the packet. */ | |
267 | switch (type) { | |
268 | case SSH_CMSG_REQUEST_COMPRESSION: | |
3c0ef626 | 269 | compression_level = packet_get_int(); |
e9a17296 | 270 | packet_check_eom(); |
3c0ef626 | 271 | if (compression_level < 1 || compression_level > 9) { |
c9f39d2c | 272 | packet_send_debug("Received invalid compression level %d.", |
e9a17296 | 273 | compression_level); |
3c0ef626 | 274 | break; |
275 | } | |
665a873d | 276 | if (options.compression == COMP_NONE) { |
f5799ae1 | 277 | debug2("compression disabled"); |
278 | break; | |
279 | } | |
3c0ef626 | 280 | /* Enable compression after we have responded with SUCCESS. */ |
281 | enable_compression_after_reply = 1; | |
282 | success = 1; | |
283 | break; | |
284 | ||
285 | case SSH_CMSG_REQUEST_PTY: | |
286 | success = session_pty_req(s); | |
287 | break; | |
288 | ||
289 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
290 | s->auth_proto = packet_get_string(&proto_len); | |
291 | s->auth_data = packet_get_string(&data_len); | |
292 | ||
293 | screen_flag = packet_get_protocol_flags() & | |
294 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
295 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
296 | ||
297 | if (packet_remaining() == 4) { | |
298 | if (!screen_flag) | |
299 | debug2("Buggy client: " | |
300 | "X11 screen flag missing"); | |
301 | s->screen = packet_get_int(); | |
302 | } else { | |
303 | s->screen = 0; | |
304 | } | |
e9a17296 | 305 | packet_check_eom(); |
3c0ef626 | 306 | success = session_setup_x11fwd(s); |
307 | if (!success) { | |
308 | xfree(s->auth_proto); | |
309 | xfree(s->auth_data); | |
310 | s->auth_proto = NULL; | |
311 | s->auth_data = NULL; | |
312 | } | |
313 | break; | |
314 | ||
315 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
316 | if (no_agent_forwarding_flag || compat13) { | |
317 | debug("Authentication agent forwarding not permitted for this authentication."); | |
318 | break; | |
319 | } | |
320 | debug("Received authentication agent forwarding request."); | |
321 | success = auth_input_request_forwarding(s->pw); | |
322 | break; | |
323 | ||
324 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
325 | if (no_port_forwarding_flag) { | |
326 | debug("Port forwarding not permitted for this authentication."); | |
327 | break; | |
328 | } | |
329 | if (!options.allow_tcp_forwarding) { | |
330 | debug("Port forwarding not permitted."); | |
331 | break; | |
332 | } | |
333 | debug("Received TCP/IP port forwarding request."); | |
334 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); | |
335 | success = 1; | |
336 | break; | |
337 | ||
338 | case SSH_CMSG_MAX_PACKET_SIZE: | |
339 | if (packet_set_maxsize(packet_get_int()) > 0) | |
340 | success = 1; | |
341 | break; | |
e9a17296 | 342 | |
3c0ef626 | 343 | case SSH_CMSG_EXEC_SHELL: |
344 | case SSH_CMSG_EXEC_CMD: | |
345 | if (type == SSH_CMSG_EXEC_CMD) { | |
346 | command = packet_get_string(&dlen); | |
347 | debug("Exec command '%.500s'", command); | |
348 | do_exec(s, command); | |
349 | xfree(command); | |
350 | } else { | |
351 | do_exec(s, NULL); | |
352 | } | |
e9a17296 | 353 | packet_check_eom(); |
3c0ef626 | 354 | session_close(s); |
355 | return; | |
356 | ||
357 | default: | |
358 | /* | |
359 | * Any unknown messages in this phase are ignored, | |
360 | * and a failure message is returned. | |
361 | */ | |
0fff78ff | 362 | logit("Unknown packet type received after authentication: %d", type); |
3c0ef626 | 363 | } |
364 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
365 | packet_send(); | |
366 | packet_write_wait(); | |
367 | ||
368 | /* Enable compression now that we have replied if appropriate. */ | |
369 | if (enable_compression_after_reply) { | |
370 | enable_compression_after_reply = 0; | |
371 | packet_start_compression(compression_level); | |
372 | } | |
373 | } | |
374 | } | |
375 | ||
376 | /* | |
377 | * This is called to fork and execute a command when we have no tty. This | |
378 | * will call do_child from the child, and server_loop from the parent after | |
379 | * setting up file descriptors and such. | |
380 | */ | |
381 | void | |
382 | do_exec_no_pty(Session *s, const char *command) | |
383 | { | |
f5799ae1 | 384 | pid_t pid; |
3c0ef626 | 385 | |
386 | #ifdef USE_PIPES | |
387 | int pin[2], pout[2], perr[2]; | |
388 | /* Allocate pipes for communicating with the program. */ | |
389 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
390 | packet_disconnect("Could not create pipes: %.100s", | |
391 | strerror(errno)); | |
392 | #else /* USE_PIPES */ | |
393 | int inout[2], err[2]; | |
394 | /* Uses socket pairs to communicate with the program. */ | |
395 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
396 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
397 | packet_disconnect("Could not create socket pairs: %.100s", | |
398 | strerror(errno)); | |
399 | #endif /* USE_PIPES */ | |
400 | if (s == NULL) | |
401 | fatal("do_exec_no_pty: no session"); | |
402 | ||
403 | session_proctitle(s); | |
404 | ||
405 | #if defined(USE_PAM) | |
cdd66111 | 406 | if (options.use_pam && !use_privsep) |
0fff78ff | 407 | do_pam_setcred(1); |
3c0ef626 | 408 | #endif /* USE_PAM */ |
409 | ||
410 | /* Fork the child. */ | |
411 | if ((pid = fork()) == 0) { | |
cdd66111 | 412 | is_child = 1; |
41b2f314 | 413 | |
3c0ef626 | 414 | /* Child. Reinitialize the log since the pid has changed. */ |
415 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
416 | ||
417 | /* | |
418 | * Create a new session and process group since the 4.4BSD | |
419 | * setlogin() affects the entire process group. | |
420 | */ | |
421 | if (setsid() < 0) | |
422 | error("setsid failed: %.100s", strerror(errno)); | |
423 | ||
424 | #ifdef USE_PIPES | |
425 | /* | |
426 | * Redirect stdin. We close the parent side of the socket | |
427 | * pair, and make the child side the standard input. | |
428 | */ | |
429 | close(pin[1]); | |
430 | if (dup2(pin[0], 0) < 0) | |
431 | perror("dup2 stdin"); | |
432 | close(pin[0]); | |
433 | ||
434 | /* Redirect stdout. */ | |
435 | close(pout[0]); | |
436 | if (dup2(pout[1], 1) < 0) | |
437 | perror("dup2 stdout"); | |
438 | close(pout[1]); | |
439 | ||
440 | /* Redirect stderr. */ | |
441 | close(perr[0]); | |
442 | if (dup2(perr[1], 2) < 0) | |
443 | perror("dup2 stderr"); | |
444 | close(perr[1]); | |
445 | #else /* USE_PIPES */ | |
446 | /* | |
447 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
448 | * use the same socket, as some programs (particularly rdist) | |
449 | * seem to depend on it. | |
450 | */ | |
451 | close(inout[1]); | |
452 | close(err[1]); | |
453 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
454 | perror("dup2 stdin"); | |
455 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
456 | perror("dup2 stdout"); | |
457 | if (dup2(err[0], 2) < 0) /* stderr */ | |
458 | perror("dup2 stderr"); | |
459 | #endif /* USE_PIPES */ | |
460 | ||
41b2f314 | 461 | #ifdef _UNICOS |
462 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
463 | #endif | |
464 | ||
3c0ef626 | 465 | /* Do processing for the child (exec command etc). */ |
466 | do_child(s, command); | |
467 | /* NOTREACHED */ | |
468 | } | |
41b2f314 | 469 | #ifdef _UNICOS |
470 | signal(WJSIGNAL, cray_job_termination_handler); | |
471 | #endif /* _UNICOS */ | |
3c0ef626 | 472 | #ifdef HAVE_CYGWIN |
473 | if (is_winnt) | |
474 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
475 | #endif | |
476 | if (pid < 0) | |
477 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
478 | s->pid = pid; | |
479 | /* Set interactive/non-interactive mode. */ | |
480 | packet_set_interactive(s->display != NULL); | |
481 | #ifdef USE_PIPES | |
482 | /* We are the parent. Close the child sides of the pipes. */ | |
483 | close(pin[0]); | |
484 | close(pout[1]); | |
485 | close(perr[1]); | |
486 | ||
487 | if (compat20) { | |
c9f39d2c | 488 | if (s->is_subsystem) { |
489 | close(perr[0]); | |
490 | perr[0] = -1; | |
491 | } | |
492 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
3c0ef626 | 493 | } else { |
494 | /* Enter the interactive session. */ | |
495 | server_loop(pid, pin[1], pout[0], perr[0]); | |
496 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ | |
497 | } | |
498 | #else /* USE_PIPES */ | |
499 | /* We are the parent. Close the child sides of the socket pairs. */ | |
500 | close(inout[0]); | |
501 | close(err[0]); | |
502 | ||
99be0775 | 503 | /* |
504 | * Clear loginmsg, since it's the child's responsibility to display | |
505 | * it to the user, otherwise multiple sessions may accumulate | |
506 | * multiple copies of the login messages. | |
507 | */ | |
508 | buffer_clear(&loginmsg); | |
509 | ||
3c0ef626 | 510 | /* |
511 | * Enter the interactive session. Note: server_loop must be able to | |
512 | * handle the case that fdin and fdout are the same. | |
513 | */ | |
514 | if (compat20) { | |
515 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); | |
516 | } else { | |
517 | server_loop(pid, inout[1], inout[1], err[1]); | |
518 | /* server_loop has closed inout[1] and err[1]. */ | |
519 | } | |
520 | #endif /* USE_PIPES */ | |
521 | } | |
522 | ||
523 | /* | |
524 | * This is called to fork and execute a command when we have a tty. This | |
525 | * will call do_child from the child, and server_loop from the parent after | |
526 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
527 | * lastlog, and other such operations. | |
528 | */ | |
529 | void | |
530 | do_exec_pty(Session *s, const char *command) | |
531 | { | |
532 | int fdout, ptyfd, ttyfd, ptymaster; | |
533 | pid_t pid; | |
534 | ||
535 | if (s == NULL) | |
536 | fatal("do_exec_pty: no session"); | |
537 | ptyfd = s->ptyfd; | |
538 | ttyfd = s->ttyfd; | |
539 | ||
540 | #if defined(USE_PAM) | |
0fff78ff | 541 | if (options.use_pam) { |
542 | do_pam_set_tty(s->tty); | |
cdd66111 | 543 | if (!use_privsep) |
544 | do_pam_setcred(1); | |
0fff78ff | 545 | } |
3c0ef626 | 546 | #endif |
547 | ||
548 | /* Fork the child. */ | |
549 | if ((pid = fork()) == 0) { | |
cdd66111 | 550 | is_child = 1; |
3c0ef626 | 551 | |
552 | /* Child. Reinitialize the log because the pid has changed. */ | |
553 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
554 | /* Close the master side of the pseudo tty. */ | |
555 | close(ptyfd); | |
556 | ||
557 | /* Make the pseudo tty our controlling tty. */ | |
558 | pty_make_controlling_tty(&ttyfd, s->tty); | |
559 | ||
560 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ | |
561 | if (dup2(ttyfd, 0) < 0) | |
562 | error("dup2 stdin: %s", strerror(errno)); | |
563 | if (dup2(ttyfd, 1) < 0) | |
564 | error("dup2 stdout: %s", strerror(errno)); | |
565 | if (dup2(ttyfd, 2) < 0) | |
566 | error("dup2 stderr: %s", strerror(errno)); | |
567 | ||
568 | /* Close the extra descriptor for the pseudo tty. */ | |
569 | close(ttyfd); | |
570 | ||
571 | /* record login, etc. similar to login(1) */ | |
572 | #ifndef HAVE_OSF_SIA | |
41b2f314 | 573 | if (!(options.use_login && command == NULL)) { |
574 | #ifdef _UNICOS | |
575 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
576 | #endif /* _UNICOS */ | |
3c0ef626 | 577 | do_login(s, command); |
41b2f314 | 578 | } |
3c0ef626 | 579 | # ifdef LOGIN_NEEDS_UTMPX |
580 | else | |
581 | do_pre_login(s); | |
582 | # endif | |
583 | #endif | |
584 | ||
585 | /* Do common processing for the child, such as execing the command. */ | |
586 | do_child(s, command); | |
587 | /* NOTREACHED */ | |
588 | } | |
41b2f314 | 589 | #ifdef _UNICOS |
590 | signal(WJSIGNAL, cray_job_termination_handler); | |
591 | #endif /* _UNICOS */ | |
3c0ef626 | 592 | #ifdef HAVE_CYGWIN |
593 | if (is_winnt) | |
594 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
595 | #endif | |
596 | if (pid < 0) | |
597 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
598 | s->pid = pid; | |
599 | ||
600 | /* Parent. Close the slave side of the pseudo tty. */ | |
601 | close(ttyfd); | |
602 | ||
603 | /* | |
604 | * Create another descriptor of the pty master side for use as the | |
605 | * standard input. We could use the original descriptor, but this | |
606 | * simplifies code in server_loop. The descriptor is bidirectional. | |
607 | */ | |
608 | fdout = dup(ptyfd); | |
609 | if (fdout < 0) | |
610 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
611 | ||
612 | /* we keep a reference to the pty master */ | |
613 | ptymaster = dup(ptyfd); | |
614 | if (ptymaster < 0) | |
615 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
616 | s->ptymaster = ptymaster; | |
617 | ||
618 | /* Enter interactive session. */ | |
619 | packet_set_interactive(1); | |
620 | if (compat20) { | |
621 | session_set_fds(s, ptyfd, fdout, -1); | |
622 | } else { | |
623 | server_loop(pid, ptyfd, fdout, -1); | |
624 | /* server_loop _has_ closed ptyfd and fdout. */ | |
625 | } | |
626 | } | |
627 | ||
628 | #ifdef LOGIN_NEEDS_UTMPX | |
629 | static void | |
630 | do_pre_login(Session *s) | |
631 | { | |
632 | socklen_t fromlen; | |
633 | struct sockaddr_storage from; | |
634 | pid_t pid = getpid(); | |
635 | ||
636 | /* | |
637 | * Get IP address of client. If the connection is not a socket, let | |
638 | * the address be 0.0.0.0. | |
639 | */ | |
640 | memset(&from, 0, sizeof(from)); | |
41b2f314 | 641 | fromlen = sizeof(from); |
3c0ef626 | 642 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 643 | if (getpeername(packet_get_connection_in(), |
e9a17296 | 644 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 645 | debug("getpeername: %.100s", strerror(errno)); |
cdd66111 | 646 | cleanup_exit(255); |
3c0ef626 | 647 | } |
648 | } | |
649 | ||
650 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
0fff78ff | 651 | get_remote_name_or_ip(utmp_len, options.use_dns), |
6a9b3198 | 652 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 653 | } |
654 | #endif | |
655 | ||
656 | /* | |
657 | * This is called to fork and execute a command. If another command is | |
658 | * to be forced, execute that instead. | |
659 | */ | |
660 | void | |
661 | do_exec(Session *s, const char *command) | |
662 | { | |
663 | if (forced_command) { | |
664 | original_command = command; | |
665 | command = forced_command; | |
666 | debug("Forced command '%.900s'", command); | |
667 | } | |
668 | ||
996d5e62 | 669 | #ifdef SSH_AUDIT_EVENTS |
670 | if (command != NULL) | |
671 | PRIVSEP(audit_run_command(command)); | |
672 | else if (s->ttyfd == -1) { | |
673 | char *shell = s->pw->pw_shell; | |
674 | ||
675 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
676 | shell =_PATH_BSHELL; | |
677 | PRIVSEP(audit_run_command(shell)); | |
0fff78ff | 678 | } |
679 | #endif | |
680 | ||
3c0ef626 | 681 | if (s->ttyfd != -1) |
682 | do_exec_pty(s, command); | |
683 | else | |
684 | do_exec_no_pty(s, command); | |
685 | ||
686 | original_command = NULL; | |
3c0ef626 | 687 | |
c9f39d2c | 688 | /* |
689 | * Clear loginmsg: it's the child's responsibility to display | |
690 | * it to the user, otherwise multiple sessions may accumulate | |
691 | * multiple copies of the login messages. | |
692 | */ | |
693 | buffer_clear(&loginmsg); | |
694 | } | |
e9a17296 | 695 | |
3c0ef626 | 696 | /* administrative, login(1)-like work */ |
697 | void | |
698 | do_login(Session *s, const char *command) | |
699 | { | |
3c0ef626 | 700 | socklen_t fromlen; |
701 | struct sockaddr_storage from; | |
3c0ef626 | 702 | struct passwd * pw = s->pw; |
703 | pid_t pid = getpid(); | |
704 | ||
705 | /* | |
706 | * Get IP address of client. If the connection is not a socket, let | |
707 | * the address be 0.0.0.0. | |
708 | */ | |
709 | memset(&from, 0, sizeof(from)); | |
6a9b3198 | 710 | fromlen = sizeof(from); |
3c0ef626 | 711 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 712 | if (getpeername(packet_get_connection_in(), |
e9a17296 | 713 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 714 | debug("getpeername: %.100s", strerror(errno)); |
cdd66111 | 715 | cleanup_exit(255); |
3c0ef626 | 716 | } |
717 | } | |
718 | ||
3c0ef626 | 719 | /* Record that there was a login on that tty from the remote host. */ |
700318f3 | 720 | if (!use_privsep) |
721 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
722 | get_remote_name_or_ip(utmp_len, | |
0fff78ff | 723 | options.use_dns), |
41b2f314 | 724 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 725 | |
726 | #ifdef USE_PAM | |
727 | /* | |
728 | * If password change is needed, do it now. | |
729 | * This needs to occur before the ~/.hushlogin check. | |
730 | */ | |
cdd66111 | 731 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
732 | display_loginmsg(); | |
3c0ef626 | 733 | do_pam_chauthtok(); |
cdd66111 | 734 | s->authctxt->force_pwchange = 0; |
0fff78ff | 735 | /* XXX - signal [net] parent to enable forwardings */ |
3c0ef626 | 736 | } |
737 | #endif | |
738 | ||
739 | if (check_quietlogin(s, command)) | |
740 | return; | |
741 | ||
cdd66111 | 742 | display_loginmsg(); |
3c0ef626 | 743 | |
3c0ef626 | 744 | do_motd(); |
745 | } | |
746 | ||
747 | /* | |
748 | * Display the message of the day. | |
749 | */ | |
750 | void | |
751 | do_motd(void) | |
752 | { | |
753 | FILE *f; | |
754 | char buf[256]; | |
755 | ||
756 | if (options.print_motd) { | |
757 | #ifdef HAVE_LOGIN_CAP | |
758 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
759 | "/etc/motd"), "r"); | |
760 | #else | |
761 | f = fopen("/etc/motd", "r"); | |
762 | #endif | |
763 | if (f) { | |
764 | while (fgets(buf, sizeof(buf), f)) | |
765 | fputs(buf, stdout); | |
766 | fclose(f); | |
767 | } | |
768 | } | |
769 | } | |
770 | ||
771 | ||
772 | /* | |
773 | * Check for quiet login, either .hushlogin or command given. | |
774 | */ | |
775 | int | |
776 | check_quietlogin(Session *s, const char *command) | |
777 | { | |
778 | char buf[256]; | |
779 | struct passwd *pw = s->pw; | |
780 | struct stat st; | |
781 | ||
782 | /* Return 1 if .hushlogin exists or a command given. */ | |
783 | if (command != NULL) | |
784 | return 1; | |
785 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
786 | #ifdef HAVE_LOGIN_CAP | |
787 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
788 | return 1; | |
789 | #else | |
790 | if (stat(buf, &st) >= 0) | |
791 | return 1; | |
792 | #endif | |
793 | return 0; | |
794 | } | |
795 | ||
796 | /* | |
797 | * Sets the value of the given variable in the environment. If the variable | |
798 | * already exists, its value is overriden. | |
799 | */ | |
0fff78ff | 800 | void |
3c0ef626 | 801 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
e9a17296 | 802 | const char *value) |
3c0ef626 | 803 | { |
3c0ef626 | 804 | char **env; |
acc3d05e | 805 | u_int envsize; |
806 | u_int i, namelen; | |
3c0ef626 | 807 | |
0fff78ff | 808 | /* |
809 | * If we're passed an uninitialized list, allocate a single null | |
810 | * entry before continuing. | |
811 | */ | |
812 | if (*envp == NULL && *envsizep == 0) { | |
813 | *envp = xmalloc(sizeof(char *)); | |
814 | *envp[0] = NULL; | |
815 | *envsizep = 1; | |
816 | } | |
817 | ||
3c0ef626 | 818 | /* |
819 | * Find the slot where the value should be stored. If the variable | |
820 | * already exists, we reuse the slot; otherwise we append a new slot | |
821 | * at the end of the array, expanding if necessary. | |
822 | */ | |
823 | env = *envp; | |
824 | namelen = strlen(name); | |
825 | for (i = 0; env[i]; i++) | |
826 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
827 | break; | |
828 | if (env[i]) { | |
829 | /* Reuse the slot. */ | |
830 | xfree(env[i]); | |
831 | } else { | |
832 | /* New variable. Expand if necessary. */ | |
acc3d05e | 833 | envsize = *envsizep; |
834 | if (i >= envsize - 1) { | |
835 | if (envsize >= 1000) | |
836 | fatal("child_set_env: too many env vars"); | |
837 | envsize += 50; | |
838 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); | |
839 | *envsizep = envsize; | |
3c0ef626 | 840 | } |
841 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
842 | env[i + 1] = NULL; | |
843 | } | |
844 | ||
845 | /* Allocate space and format the variable in the appropriate slot. */ | |
846 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
847 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
848 | } | |
849 | ||
850 | /* | |
851 | * Reads environment variables from the given file and adds/overrides them | |
852 | * into the environment. If the file does not exist, this does nothing. | |
853 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
854 | * and assignments of the form name=value. No other forms are allowed. | |
855 | */ | |
856 | static void | |
857 | read_environment_file(char ***env, u_int *envsize, | |
e9a17296 | 858 | const char *filename) |
3c0ef626 | 859 | { |
860 | FILE *f; | |
861 | char buf[4096]; | |
862 | char *cp, *value; | |
680cee3b | 863 | u_int lineno = 0; |
3c0ef626 | 864 | |
865 | f = fopen(filename, "r"); | |
866 | if (!f) | |
867 | return; | |
868 | ||
869 | while (fgets(buf, sizeof(buf), f)) { | |
680cee3b | 870 | if (++lineno > 1000) |
871 | fatal("Too many lines in environment file %s", filename); | |
3c0ef626 | 872 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
873 | ; | |
874 | if (!*cp || *cp == '#' || *cp == '\n') | |
875 | continue; | |
876 | if (strchr(cp, '\n')) | |
877 | *strchr(cp, '\n') = '\0'; | |
878 | value = strchr(cp, '='); | |
879 | if (value == NULL) { | |
680cee3b | 880 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
881 | filename); | |
3c0ef626 | 882 | continue; |
883 | } | |
884 | /* | |
885 | * Replace the equals sign by nul, and advance value to | |
886 | * the value string. | |
887 | */ | |
888 | *value = '\0'; | |
889 | value++; | |
890 | child_set_env(env, envsize, cp, value); | |
891 | } | |
892 | fclose(f); | |
893 | } | |
894 | ||
0fff78ff | 895 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
896 | /* | |
897 | * Return named variable from specified environment, or NULL if not present. | |
898 | */ | |
899 | static char * | |
900 | child_get_env(char **env, const char *name) | |
901 | { | |
902 | int i; | |
903 | size_t len; | |
904 | ||
905 | len = strlen(name); | |
906 | for (i=0; env[i] != NULL; i++) | |
907 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
908 | return(env[i] + len + 1); | |
909 | return NULL; | |
910 | } | |
911 | ||
912 | /* | |
913 | * Read /etc/default/login. | |
914 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
915 | */ | |
916 | static void | |
917 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
918 | { | |
919 | char **tmpenv = NULL, *var; | |
acc3d05e | 920 | u_int i, tmpenvsize = 0; |
cdd66111 | 921 | u_long mask; |
0fff78ff | 922 | |
923 | /* | |
924 | * We don't want to copy the whole file to the child's environment, | |
925 | * so we use a temporary environment and copy the variables we're | |
926 | * interested in. | |
927 | */ | |
928 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
929 | ||
acc3d05e | 930 | if (tmpenv == NULL) |
931 | return; | |
932 | ||
0fff78ff | 933 | if (uid == 0) |
934 | var = child_get_env(tmpenv, "SUPATH"); | |
935 | else | |
936 | var = child_get_env(tmpenv, "PATH"); | |
937 | if (var != NULL) | |
938 | child_set_env(env, envsize, "PATH", var); | |
cdd66111 | 939 | |
0fff78ff | 940 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
941 | if (sscanf(var, "%5lo", &mask) == 1) | |
cdd66111 | 942 | umask((mode_t)mask); |
943 | ||
0fff78ff | 944 | for (i = 0; tmpenv[i] != NULL; i++) |
945 | xfree(tmpenv[i]); | |
946 | xfree(tmpenv); | |
947 | } | |
948 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
949 | ||
665a873d | 950 | void |
951 | copy_environment(char **source, char ***env, u_int *envsize) | |
3c0ef626 | 952 | { |
e9a17296 | 953 | char *var_name, *var_val; |
3c0ef626 | 954 | int i; |
955 | ||
e9a17296 | 956 | if (source == NULL) |
3c0ef626 | 957 | return; |
958 | ||
e9a17296 | 959 | for(i = 0; source[i] != NULL; i++) { |
960 | var_name = xstrdup(source[i]); | |
961 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
962 | xfree(var_name); | |
3c0ef626 | 963 | continue; |
3c0ef626 | 964 | } |
e9a17296 | 965 | *var_val++ = '\0'; |
3c0ef626 | 966 | |
e9a17296 | 967 | debug3("Copy environment: %s=%s", var_name, var_val); |
968 | child_set_env(env, envsize, var_name, var_val); | |
cdd66111 | 969 | |
e9a17296 | 970 | xfree(var_name); |
3c0ef626 | 971 | } |
972 | } | |
3c0ef626 | 973 | |
e9a17296 | 974 | static char ** |
975 | do_setup_env(Session *s, const char *shell) | |
3c0ef626 | 976 | { |
3c0ef626 | 977 | char buf[256]; |
e9a17296 | 978 | u_int i, envsize; |
0fff78ff | 979 | char **env, *laddr, *path = NULL; |
e9a17296 | 980 | struct passwd *pw = s->pw; |
3c0ef626 | 981 | |
982 | /* Initialize the environment. */ | |
983 | envsize = 100; | |
984 | env = xmalloc(envsize * sizeof(char *)); | |
985 | env[0] = NULL; | |
986 | ||
987 | #ifdef HAVE_CYGWIN | |
988 | /* | |
989 | * The Windows environment contains some setting which are | |
990 | * important for a running system. They must not be dropped. | |
991 | */ | |
996d5e62 | 992 | { |
993 | char **p; | |
994 | ||
995 | p = fetch_windows_environment(); | |
996 | copy_environment(p, &env, &envsize); | |
997 | free_windows_environment(p); | |
998 | } | |
3c0ef626 | 999 | #endif |
1000 | ||
0fff78ff | 1001 | #ifdef GSSAPI |
cdd66111 | 1002 | /* Allow any GSSAPI methods that we've used to alter |
0fff78ff | 1003 | * the childs environment as they see fit |
1004 | */ | |
1005 | ssh_gssapi_do_child(&env, &envsize); | |
1006 | #endif | |
1007 | ||
3c0ef626 | 1008 | if (!options.use_login) { |
1009 | /* Set basic environment. */ | |
c9f39d2c | 1010 | for (i = 0; i < s->num_env; i++) |
1011 | child_set_env(&env, &envsize, s->env[i].name, | |
1012 | s->env[i].val); | |
1013 | ||
3c0ef626 | 1014 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1015 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
6a9b3198 | 1016 | #ifdef _AIX |
1017 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1018 | #endif | |
3c0ef626 | 1019 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
1020 | #ifdef HAVE_LOGIN_CAP | |
41b2f314 | 1021 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1022 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1023 | else | |
1024 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
3c0ef626 | 1025 | #else /* HAVE_LOGIN_CAP */ |
1026 | # ifndef HAVE_CYGWIN | |
1027 | /* | |
1028 | * There's no standard path on Windows. The path contains | |
1029 | * important components pointing to the system directories, | |
1030 | * needed for loading shared libraries. So the path better | |
1031 | * remains intact here. | |
1032 | */ | |
0fff78ff | 1033 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1034 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1035 | path = child_get_env(env, "PATH"); | |
1036 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1037 | if (path == NULL || *path == '\0') { | |
cdd66111 | 1038 | child_set_env(&env, &envsize, "PATH", |
0fff78ff | 1039 | s->pw->pw_uid == 0 ? |
1040 | SUPERUSER_PATH : _PATH_STDPATH); | |
1041 | } | |
3c0ef626 | 1042 | # endif /* HAVE_CYGWIN */ |
1043 | #endif /* HAVE_LOGIN_CAP */ | |
1044 | ||
1045 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1046 | _PATH_MAILDIR, pw->pw_name); | |
1047 | child_set_env(&env, &envsize, "MAIL", buf); | |
1048 | ||
1049 | /* Normal systems set SHELL by default. */ | |
1050 | child_set_env(&env, &envsize, "SHELL", shell); | |
1051 | } | |
1052 | if (getenv("TZ")) | |
1053 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1054 | ||
1055 | /* Set custom environment options from RSA authentication. */ | |
1056 | if (!options.use_login) { | |
1057 | while (custom_environment) { | |
1058 | struct envstring *ce = custom_environment; | |
41b2f314 | 1059 | char *str = ce->s; |
e9a17296 | 1060 | |
41b2f314 | 1061 | for (i = 0; str[i] != '=' && str[i]; i++) |
3c0ef626 | 1062 | ; |
41b2f314 | 1063 | if (str[i] == '=') { |
1064 | str[i] = 0; | |
1065 | child_set_env(&env, &envsize, str, str + i + 1); | |
3c0ef626 | 1066 | } |
1067 | custom_environment = ce->next; | |
1068 | xfree(ce->s); | |
1069 | xfree(ce); | |
1070 | } | |
1071 | } | |
1072 | ||
41b2f314 | 1073 | /* SSH_CLIENT deprecated */ |
3c0ef626 | 1074 | snprintf(buf, sizeof buf, "%.50s %d %d", |
e9a17296 | 1075 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
3c0ef626 | 1076 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1077 | ||
6a9b3198 | 1078 | laddr = get_local_ipaddr(packet_get_connection_in()); |
41b2f314 | 1079 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
6a9b3198 | 1080 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1081 | xfree(laddr); | |
41b2f314 | 1082 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1083 | ||
3c0ef626 | 1084 | if (s->ttyfd != -1) |
1085 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1086 | if (s->term) | |
1087 | child_set_env(&env, &envsize, "TERM", s->term); | |
1088 | if (s->display) | |
1089 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
1090 | if (original_command) | |
1091 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1092 | original_command); | |
1093 | ||
41b2f314 | 1094 | #ifdef _UNICOS |
1095 | if (cray_tmpdir[0] != '\0') | |
1096 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1097 | #endif /* _UNICOS */ | |
1098 | ||
996d5e62 | 1099 | /* |
1100 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1101 | * must have been set by a native authentication method (eg AIX or | |
1102 | * SIA), so copy it to the child. | |
1103 | */ | |
1104 | { | |
1105 | char *cp; | |
1106 | ||
1107 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1108 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1109 | } | |
1110 | ||
3c0ef626 | 1111 | #ifdef _AIX |
e9a17296 | 1112 | { |
1113 | char *cp; | |
1114 | ||
1115 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1116 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
e9a17296 | 1117 | read_environment_file(&env, &envsize, "/etc/environment"); |
1118 | } | |
3c0ef626 | 1119 | #endif |
3c0ef626 | 1120 | #ifdef KRB5 |
99be0775 | 1121 | if (s->authctxt->krb5_ccname) |
3c0ef626 | 1122 | child_set_env(&env, &envsize, "KRB5CCNAME", |
99be0775 | 1123 | s->authctxt->krb5_ccname); |
3c0ef626 | 1124 | #endif |
1125 | #ifdef USE_PAM | |
41b2f314 | 1126 | /* |
1127 | * Pull in any environment variables that may have | |
1128 | * been set by PAM. | |
1129 | */ | |
0fff78ff | 1130 | if (options.use_pam) { |
cdd66111 | 1131 | char **p; |
41b2f314 | 1132 | |
cdd66111 | 1133 | p = fetch_pam_child_environment(); |
1134 | copy_environment(p, &env, &envsize); | |
1135 | free_pam_environment(p); | |
1136 | ||
1137 | p = fetch_pam_environment(); | |
41b2f314 | 1138 | copy_environment(p, &env, &envsize); |
1139 | free_pam_environment(p); | |
1140 | } | |
3c0ef626 | 1141 | #endif /* USE_PAM */ |
1142 | ||
f5799ae1 | 1143 | if (auth_sock_name != NULL) |
3c0ef626 | 1144 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
f5799ae1 | 1145 | auth_sock_name); |
3c0ef626 | 1146 | |
1147 | /* read $HOME/.ssh/environment. */ | |
41b2f314 | 1148 | if (options.permit_user_env && !options.use_login) { |
3c0ef626 | 1149 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
41b2f314 | 1150 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
3c0ef626 | 1151 | read_environment_file(&env, &envsize, buf); |
1152 | } | |
1153 | if (debug_flag) { | |
1154 | /* dump the environment */ | |
1155 | fprintf(stderr, "Environment:\n"); | |
1156 | for (i = 0; env[i]; i++) | |
1157 | fprintf(stderr, " %.200s\n", env[i]); | |
1158 | } | |
e9a17296 | 1159 | return env; |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1164 | * first in this order). | |
1165 | */ | |
1166 | static void | |
1167 | do_rc_files(Session *s, const char *shell) | |
1168 | { | |
1169 | FILE *f = NULL; | |
1170 | char cmd[1024]; | |
1171 | int do_xauth; | |
1172 | struct stat st; | |
1173 | ||
1174 | do_xauth = | |
1175 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1176 | ||
1177 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1178 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1179 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1180 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1181 | if (debug_flag) | |
1182 | fprintf(stderr, "Running %s\n", cmd); | |
1183 | f = popen(cmd, "w"); | |
1184 | if (f) { | |
1185 | if (do_xauth) | |
1186 | fprintf(f, "%s %s\n", s->auth_proto, | |
1187 | s->auth_data); | |
1188 | pclose(f); | |
1189 | } else | |
1190 | fprintf(stderr, "Could not run %s\n", | |
1191 | _PATH_SSH_USER_RC); | |
1192 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1193 | if (debug_flag) | |
1194 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1195 | _PATH_SSH_SYSTEM_RC); | |
1196 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1197 | if (f) { | |
1198 | if (do_xauth) | |
1199 | fprintf(f, "%s %s\n", s->auth_proto, | |
1200 | s->auth_data); | |
1201 | pclose(f); | |
1202 | } else | |
1203 | fprintf(stderr, "Could not run %s\n", | |
1204 | _PATH_SSH_SYSTEM_RC); | |
1205 | } else if (do_xauth && options.xauth_location != NULL) { | |
1206 | /* Add authority data to .Xauthority if appropriate. */ | |
1207 | if (debug_flag) { | |
1208 | fprintf(stderr, | |
6a9b3198 | 1209 | "Running %.500s remove %.100s\n", |
cdd66111 | 1210 | options.xauth_location, s->auth_display); |
6a9b3198 | 1211 | fprintf(stderr, |
1212 | "%.500s add %.100s %.100s %.100s\n", | |
e9a17296 | 1213 | options.xauth_location, s->auth_display, |
1214 | s->auth_proto, s->auth_data); | |
1215 | } | |
1216 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1217 | options.xauth_location); | |
1218 | f = popen(cmd, "w"); | |
1219 | if (f) { | |
6a9b3198 | 1220 | fprintf(f, "remove %s\n", |
1221 | s->auth_display); | |
e9a17296 | 1222 | fprintf(f, "add %s %s %s\n", |
1223 | s->auth_display, s->auth_proto, | |
1224 | s->auth_data); | |
1225 | pclose(f); | |
1226 | } else { | |
1227 | fprintf(stderr, "Could not run %s\n", | |
1228 | cmd); | |
1229 | } | |
1230 | } | |
1231 | } | |
1232 | ||
1233 | static void | |
1234 | do_nologin(struct passwd *pw) | |
1235 | { | |
1236 | FILE *f = NULL; | |
1237 | char buf[1024]; | |
1238 | ||
1239 | #ifdef HAVE_LOGIN_CAP | |
1240 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1241 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1242 | _PATH_NOLOGIN), "r"); | |
1243 | #else | |
1244 | if (pw->pw_uid) | |
1245 | f = fopen(_PATH_NOLOGIN, "r"); | |
1246 | #endif | |
1247 | if (f) { | |
1248 | /* /etc/nologin exists. Print its contents and exit. */ | |
0fff78ff | 1249 | logit("User %.100s not allowed because %s exists", |
41b2f314 | 1250 | pw->pw_name, _PATH_NOLOGIN); |
e9a17296 | 1251 | while (fgets(buf, sizeof(buf), f)) |
1252 | fputs(buf, stderr); | |
1253 | fclose(f); | |
6a9b3198 | 1254 | fflush(NULL); |
e9a17296 | 1255 | exit(254); |
1256 | } | |
1257 | } | |
1258 | ||
1259 | /* Set login name, uid, gid, and groups. */ | |
700318f3 | 1260 | void |
e9a17296 | 1261 | do_setusercontext(struct passwd *pw) |
1262 | { | |
6a9b3198 | 1263 | #ifndef HAVE_CYGWIN |
1264 | if (getuid() == 0 || geteuid() == 0) | |
e9a17296 | 1265 | #endif /* HAVE_CYGWIN */ |
6a9b3198 | 1266 | { |
1267 | ||
f5799ae1 | 1268 | #ifdef HAVE_SETPCRED |
0fff78ff | 1269 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1270 | fatal("Failed to set process credentials"); | |
f5799ae1 | 1271 | #endif /* HAVE_SETPCRED */ |
e9a17296 | 1272 | #ifdef HAVE_LOGIN_CAP |
41b2f314 | 1273 | # ifdef __bsdi__ |
680cee3b | 1274 | setpgid(0, 0); |
41b2f314 | 1275 | # endif |
996d5e62 | 1276 | #ifdef GSSAPI |
1277 | if (options.gss_authentication) { | |
1278 | temporarily_use_uid(pw); | |
1279 | ssh_gssapi_storecreds(); | |
1280 | restore_uid(); | |
1281 | } | |
1282 | #endif | |
cdd66111 | 1283 | # ifdef USE_PAM |
1284 | if (options.use_pam) { | |
1285 | do_pam_session(); | |
1286 | do_pam_setcred(0); | |
1287 | } | |
1288 | # endif /* USE_PAM */ | |
e9a17296 | 1289 | if (setusercontext(lc, pw, pw->pw_uid, |
1290 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1291 | perror("unable to set user context"); | |
1292 | exit(1); | |
1293 | } | |
1294 | #else | |
1295 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1296 | /* Sets login uid for accounting */ | |
1297 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1298 | error("setluid: %s", strerror(errno)); | |
1299 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1300 | ||
1301 | if (setlogin(pw->pw_name) < 0) | |
1302 | error("setlogin failed: %s", strerror(errno)); | |
1303 | if (setgid(pw->pw_gid) < 0) { | |
1304 | perror("setgid"); | |
1305 | exit(1); | |
1306 | } | |
1307 | /* Initialize the group list. */ | |
1308 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1309 | perror("initgroups"); | |
1310 | exit(1); | |
1311 | } | |
1312 | endgrent(); | |
996d5e62 | 1313 | #ifdef GSSAPI |
1314 | if (options.gss_authentication) { | |
1315 | temporarily_use_uid(pw); | |
1316 | ssh_gssapi_storecreds(); | |
1317 | restore_uid(); | |
1318 | } | |
1319 | #endif | |
e9a17296 | 1320 | # ifdef USE_PAM |
1321 | /* | |
cdd66111 | 1322 | * PAM credentials may take the form of supplementary groups. |
e9a17296 | 1323 | * These will have been wiped by the above initgroups() call. |
1324 | * Reestablish them here. | |
1325 | */ | |
0fff78ff | 1326 | if (options.use_pam) { |
1327 | do_pam_session(); | |
1328 | do_pam_setcred(0); | |
1329 | } | |
e9a17296 | 1330 | # endif /* USE_PAM */ |
1331 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1332 | irix_setusercontext(pw); | |
1333 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
680cee3b | 1334 | # ifdef _AIX |
41b2f314 | 1335 | aix_usrinfo(pw); |
680cee3b | 1336 | # endif /* _AIX */ |
665a873d | 1337 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
1338 | if (set_id(pw->pw_name) != 0) { | |
1339 | exit(1); | |
1340 | } | |
1341 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ | |
e9a17296 | 1342 | /* Permanently switch to the desired uid. */ |
1343 | permanently_set_uid(pw); | |
1344 | #endif | |
1345 | } | |
6a9b3198 | 1346 | |
1347 | #ifdef HAVE_CYGWIN | |
1348 | if (is_winnt) | |
1349 | #endif | |
e9a17296 | 1350 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1351 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1352 | } | |
1353 | ||
cdd66111 | 1354 | static void |
1355 | do_pwchange(Session *s) | |
1356 | { | |
c9f39d2c | 1357 | fflush(NULL); |
cdd66111 | 1358 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1359 | if (s->ttyfd != -1) { | |
c9f39d2c | 1360 | fprintf(stderr, |
cdd66111 | 1361 | "You must change your password now and login again!\n"); |
996d5e62 | 1362 | #ifdef PASSWD_NEEDS_USERNAME |
1363 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1364 | (char *)NULL); | |
1365 | #else | |
cdd66111 | 1366 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
996d5e62 | 1367 | #endif |
cdd66111 | 1368 | perror("passwd"); |
1369 | } else { | |
1370 | fprintf(stderr, | |
1371 | "Password change required but no TTY available.\n"); | |
1372 | } | |
1373 | exit(1); | |
1374 | } | |
1375 | ||
700318f3 | 1376 | static void |
1377 | launch_login(struct passwd *pw, const char *hostname) | |
1378 | { | |
1379 | /* Launch login(1). */ | |
1380 | ||
f5799ae1 | 1381 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
700318f3 | 1382 | #ifdef xxxLOGIN_NEEDS_TERM |
f5799ae1 | 1383 | (s->term ? s->term : "unknown"), |
700318f3 | 1384 | #endif /* LOGIN_NEEDS_TERM */ |
1385 | #ifdef LOGIN_NO_ENDOPT | |
1386 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1387 | #else | |
1388 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1389 | #endif | |
1390 | ||
1391 | /* Login couldn't be executed, die. */ | |
1392 | ||
1393 | perror("login"); | |
1394 | exit(1); | |
1395 | } | |
1396 | ||
cdd66111 | 1397 | static void |
1398 | child_close_fds(void) | |
1399 | { | |
1400 | int i; | |
1401 | ||
1402 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1403 | close(packet_get_connection_in()); | |
1404 | else { | |
1405 | close(packet_get_connection_in()); | |
1406 | close(packet_get_connection_out()); | |
1407 | } | |
1408 | /* | |
1409 | * Close all descriptors related to channels. They will still remain | |
1410 | * open in the parent. | |
1411 | */ | |
1412 | /* XXX better use close-on-exec? -markus */ | |
1413 | channel_close_all(); | |
1414 | ||
1415 | /* | |
1416 | * Close any extra file descriptors. Note that there may still be | |
1417 | * descriptors left by system functions. They will be closed later. | |
1418 | */ | |
1419 | endpwent(); | |
1420 | ||
1421 | /* | |
1422 | * Close any extra open file descriptors so that we don\'t have them | |
1423 | * hanging around in clients. Note that we want to do this after | |
1424 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1425 | * descriptors open. | |
1426 | */ | |
1427 | for (i = 3; i < 64; i++) | |
1428 | close(i); | |
1429 | } | |
1430 | ||
e9a17296 | 1431 | /* |
1432 | * Performs common processing for the child, such as setting up the | |
1433 | * environment, closing extra file descriptors, setting the user and group | |
1434 | * ids, and executing the command or shell. | |
1435 | */ | |
1436 | void | |
1437 | do_child(Session *s, const char *command) | |
1438 | { | |
1439 | extern char **environ; | |
1440 | char **env; | |
1441 | char *argv[10]; | |
1442 | const char *shell, *shell0, *hostname = NULL; | |
1443 | struct passwd *pw = s->pw; | |
e9a17296 | 1444 | |
1445 | /* remove hostkey from the child's memory */ | |
1446 | destroy_sensitive_data(); | |
1447 | ||
cdd66111 | 1448 | /* Force a password change */ |
1449 | if (s->authctxt->force_pwchange) { | |
1450 | do_setusercontext(pw); | |
1451 | child_close_fds(); | |
1452 | do_pwchange(s); | |
1453 | exit(1); | |
1454 | } | |
1455 | ||
e9a17296 | 1456 | /* login(1) is only called if we execute the login shell */ |
1457 | if (options.use_login && command != NULL) | |
1458 | options.use_login = 0; | |
1459 | ||
41b2f314 | 1460 | #ifdef _UNICOS |
1461 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1462 | #endif /* _UNICOS */ | |
1463 | ||
e9a17296 | 1464 | /* |
1465 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1466 | * switch, so we let login(1) to this for us. | |
1467 | */ | |
1468 | if (!options.use_login) { | |
1469 | #ifdef HAVE_OSF_SIA | |
6a9b3198 | 1470 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
e9a17296 | 1471 | if (!check_quietlogin(s, command)) |
1472 | do_motd(); | |
1473 | #else /* HAVE_OSF_SIA */ | |
1474 | do_nologin(pw); | |
e9a17296 | 1475 | do_setusercontext(pw); |
c9f39d2c | 1476 | /* |
1477 | * PAM session modules in do_setusercontext may have | |
1478 | * generated messages, so if this in an interactive | |
1479 | * login then display them too. | |
1480 | */ | |
996d5e62 | 1481 | if (!check_quietlogin(s, command)) |
c9f39d2c | 1482 | display_loginmsg(); |
e9a17296 | 1483 | #endif /* HAVE_OSF_SIA */ |
1484 | } | |
1485 | ||
996d5e62 | 1486 | #ifdef USE_PAM |
dec6d9fe | 1487 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1488 | debug3("PAM session not opened, exiting"); | |
996d5e62 | 1489 | display_loginmsg(); |
1490 | exit(254); | |
1491 | } | |
1492 | #endif | |
1493 | ||
e9a17296 | 1494 | /* |
1495 | * Get the shell from the password data. An empty shell field is | |
1496 | * legal, and means /bin/sh. | |
1497 | */ | |
1498 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
6a9b3198 | 1499 | |
1500 | /* | |
1501 | * Make sure $SHELL points to the shell from the password file, | |
1502 | * even if shell is overridden from login.conf | |
1503 | */ | |
1504 | env = do_setup_env(s, shell); | |
1505 | ||
e9a17296 | 1506 | #ifdef HAVE_LOGIN_CAP |
1507 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1508 | #endif | |
1509 | ||
3c0ef626 | 1510 | /* we have to stash the hostname before we close our socket. */ |
1511 | if (options.use_login) | |
1512 | hostname = get_remote_name_or_ip(utmp_len, | |
0fff78ff | 1513 | options.use_dns); |
3c0ef626 | 1514 | /* |
1515 | * Close the connection descriptors; note that this is the child, and | |
1516 | * the server will still have the socket open, and it is important | |
1517 | * that we do not shutdown it. Note that the descriptors cannot be | |
1518 | * closed before building the environment, as we call | |
1519 | * get_remote_ipaddr there. | |
1520 | */ | |
cdd66111 | 1521 | child_close_fds(); |
3c0ef626 | 1522 | |
1523 | /* | |
cdd66111 | 1524 | * Must take new environment into use so that .ssh/rc, |
1525 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
3c0ef626 | 1526 | */ |
cdd66111 | 1527 | environ = env; |
3c0ef626 | 1528 | |
cdd66111 | 1529 | #if defined(KRB5) && defined(USE_AFS) |
3c0ef626 | 1530 | /* |
cdd66111 | 1531 | * At this point, we check to see if AFS is active and if we have |
1532 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1533 | * if we can (and need to) extend the ticket into an AFS token. If | |
1534 | * we don't do this, we run into potential problems if the user's | |
1535 | * home directory is in AFS and it's not world-readable. | |
3c0ef626 | 1536 | */ |
3c0ef626 | 1537 | |
cdd66111 | 1538 | if (options.kerberos_get_afs_token && k_hasafs() && |
665a873d | 1539 | (s->authctxt->krb5_ctx != NULL)) { |
cdd66111 | 1540 | char cell[64]; |
1541 | ||
1542 | debug("Getting AFS token"); | |
1543 | ||
1544 | k_setpag(); | |
1545 | ||
1546 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1547 | krb5_afslog(s->authctxt->krb5_ctx, | |
1548 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1549 | ||
1550 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1551 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1552 | } | |
1553 | #endif | |
3c0ef626 | 1554 | |
3c0ef626 | 1555 | /* Change current directory to the user\'s home directory. */ |
1556 | if (chdir(pw->pw_dir) < 0) { | |
1557 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1558 | pw->pw_dir, strerror(errno)); | |
1559 | #ifdef HAVE_LOGIN_CAP | |
1560 | if (login_getcapbool(lc, "requirehome", 0)) | |
1561 | exit(1); | |
1562 | #endif | |
1563 | } | |
1564 | ||
e9a17296 | 1565 | if (!options.use_login) |
1566 | do_rc_files(s, shell); | |
3c0ef626 | 1567 | |
1568 | /* restore SIGPIPE for child */ | |
1569 | signal(SIGPIPE, SIG_DFL); | |
1570 | ||
e9a17296 | 1571 | if (options.use_login) { |
700318f3 | 1572 | launch_login(pw, hostname); |
1573 | /* NEVERREACHED */ | |
e9a17296 | 1574 | } |
1575 | ||
1576 | /* Get the last component of the shell name. */ | |
1577 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1578 | shell0++; | |
1579 | else | |
1580 | shell0 = shell; | |
1581 | ||
3c0ef626 | 1582 | /* |
1583 | * If we have no command, execute the shell. In this case, the shell | |
1584 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1585 | * this is a login shell. | |
1586 | */ | |
1587 | if (!command) { | |
e9a17296 | 1588 | char argv0[256]; |
3c0ef626 | 1589 | |
e9a17296 | 1590 | /* Start the shell. Set initial character to '-'. */ |
1591 | argv0[0] = '-'; | |
3c0ef626 | 1592 | |
e9a17296 | 1593 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1594 | >= sizeof(argv0) - 1) { | |
1595 | errno = EINVAL; | |
3c0ef626 | 1596 | perror(shell); |
1597 | exit(1); | |
e9a17296 | 1598 | } |
3c0ef626 | 1599 | |
e9a17296 | 1600 | /* Execute the shell. */ |
1601 | argv[0] = argv0; | |
1602 | argv[1] = NULL; | |
1603 | execve(shell, argv, env); | |
3c0ef626 | 1604 | |
e9a17296 | 1605 | /* Executing the shell failed. */ |
1606 | perror(shell); | |
1607 | exit(1); | |
3c0ef626 | 1608 | } |
1609 | /* | |
1610 | * Execute the command using the user's shell. This uses the -c | |
1611 | * option to execute the command. | |
1612 | */ | |
e9a17296 | 1613 | argv[0] = (char *) shell0; |
3c0ef626 | 1614 | argv[1] = "-c"; |
1615 | argv[2] = (char *) command; | |
1616 | argv[3] = NULL; | |
1617 | execve(shell, argv, env); | |
1618 | perror(shell); | |
1619 | exit(1); | |
1620 | } | |
1621 | ||
1622 | Session * | |
1623 | session_new(void) | |
1624 | { | |
1625 | int i; | |
1626 | static int did_init = 0; | |
1627 | if (!did_init) { | |
1628 | debug("session_new: init"); | |
e9a17296 | 1629 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1630 | sessions[i].used = 0; |
1631 | } | |
1632 | did_init = 1; | |
1633 | } | |
e9a17296 | 1634 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1635 | Session *s = &sessions[i]; |
1636 | if (! s->used) { | |
1637 | memset(s, 0, sizeof(*s)); | |
1638 | s->chanid = -1; | |
1639 | s->ptyfd = -1; | |
1640 | s->ttyfd = -1; | |
1641 | s->used = 1; | |
1642 | s->self = i; | |
665a873d | 1643 | s->x11_chanids = NULL; |
3c0ef626 | 1644 | debug("session_new: session %d", i); |
1645 | return s; | |
1646 | } | |
1647 | } | |
1648 | return NULL; | |
1649 | } | |
1650 | ||
1651 | static void | |
1652 | session_dump(void) | |
1653 | { | |
1654 | int i; | |
e9a17296 | 1655 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1656 | Session *s = &sessions[i]; |
f5799ae1 | 1657 | debug("dump: used %d session %d %p channel %d pid %ld", |
3c0ef626 | 1658 | s->used, |
1659 | s->self, | |
1660 | s, | |
1661 | s->chanid, | |
f5799ae1 | 1662 | (long)s->pid); |
3c0ef626 | 1663 | } |
1664 | } | |
1665 | ||
1666 | int | |
1667 | session_open(Authctxt *authctxt, int chanid) | |
1668 | { | |
1669 | Session *s = session_new(); | |
1670 | debug("session_open: channel %d", chanid); | |
1671 | if (s == NULL) { | |
1672 | error("no more sessions"); | |
1673 | return 0; | |
1674 | } | |
1675 | s->authctxt = authctxt; | |
1676 | s->pw = authctxt->pw; | |
cdd66111 | 1677 | if (s->pw == NULL || !authctxt->valid) |
3c0ef626 | 1678 | fatal("no user for session %d", s->self); |
1679 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1680 | s->chanid = chanid; | |
1681 | return 1; | |
1682 | } | |
1683 | ||
700318f3 | 1684 | Session * |
1685 | session_by_tty(char *tty) | |
1686 | { | |
1687 | int i; | |
1688 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1689 | Session *s = &sessions[i]; | |
1690 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1691 | debug("session_by_tty: session %d tty %s", i, tty); | |
1692 | return s; | |
1693 | } | |
1694 | } | |
1695 | debug("session_by_tty: unknown tty %.100s", tty); | |
1696 | session_dump(); | |
1697 | return NULL; | |
1698 | } | |
1699 | ||
3c0ef626 | 1700 | static Session * |
1701 | session_by_channel(int id) | |
1702 | { | |
1703 | int i; | |
e9a17296 | 1704 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1705 | Session *s = &sessions[i]; |
1706 | if (s->used && s->chanid == id) { | |
1707 | debug("session_by_channel: session %d channel %d", i, id); | |
1708 | return s; | |
1709 | } | |
1710 | } | |
1711 | debug("session_by_channel: unknown channel %d", id); | |
1712 | session_dump(); | |
1713 | return NULL; | |
1714 | } | |
1715 | ||
665a873d | 1716 | static Session * |
1717 | session_by_x11_channel(int id) | |
1718 | { | |
1719 | int i, j; | |
1720 | ||
1721 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1722 | Session *s = &sessions[i]; | |
1723 | ||
1724 | if (s->x11_chanids == NULL || !s->used) | |
1725 | continue; | |
1726 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
1727 | if (s->x11_chanids[j] == id) { | |
1728 | debug("session_by_x11_channel: session %d " | |
1729 | "channel %d", s->self, id); | |
1730 | return s; | |
1731 | } | |
1732 | } | |
1733 | } | |
1734 | debug("session_by_x11_channel: unknown channel %d", id); | |
1735 | session_dump(); | |
1736 | return NULL; | |
1737 | } | |
1738 | ||
3c0ef626 | 1739 | static Session * |
1740 | session_by_pid(pid_t pid) | |
1741 | { | |
1742 | int i; | |
f5799ae1 | 1743 | debug("session_by_pid: pid %ld", (long)pid); |
e9a17296 | 1744 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1745 | Session *s = &sessions[i]; |
1746 | if (s->used && s->pid == pid) | |
1747 | return s; | |
1748 | } | |
f5799ae1 | 1749 | error("session_by_pid: unknown pid %ld", (long)pid); |
3c0ef626 | 1750 | session_dump(); |
1751 | return NULL; | |
1752 | } | |
1753 | ||
1754 | static int | |
1755 | session_window_change_req(Session *s) | |
1756 | { | |
1757 | s->col = packet_get_int(); | |
1758 | s->row = packet_get_int(); | |
1759 | s->xpixel = packet_get_int(); | |
1760 | s->ypixel = packet_get_int(); | |
e9a17296 | 1761 | packet_check_eom(); |
3c0ef626 | 1762 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1763 | return 1; | |
1764 | } | |
1765 | ||
1766 | static int | |
1767 | session_pty_req(Session *s) | |
1768 | { | |
1769 | u_int len; | |
1770 | int n_bytes; | |
1771 | ||
1772 | if (no_pty_flag) { | |
1773 | debug("Allocating a pty not permitted for this authentication."); | |
1774 | return 0; | |
1775 | } | |
1776 | if (s->ttyfd != -1) { | |
1777 | packet_disconnect("Protocol error: you already have a pty."); | |
1778 | return 0; | |
1779 | } | |
1780 | ||
1781 | s->term = packet_get_string(&len); | |
1782 | ||
1783 | if (compat20) { | |
1784 | s->col = packet_get_int(); | |
1785 | s->row = packet_get_int(); | |
1786 | } else { | |
1787 | s->row = packet_get_int(); | |
1788 | s->col = packet_get_int(); | |
1789 | } | |
1790 | s->xpixel = packet_get_int(); | |
1791 | s->ypixel = packet_get_int(); | |
1792 | ||
1793 | if (strcmp(s->term, "") == 0) { | |
1794 | xfree(s->term); | |
1795 | s->term = NULL; | |
1796 | } | |
1797 | ||
1798 | /* Allocate a pty and open it. */ | |
1799 | debug("Allocating pty."); | |
700318f3 | 1800 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
3c0ef626 | 1801 | if (s->term) |
1802 | xfree(s->term); | |
1803 | s->term = NULL; | |
1804 | s->ptyfd = -1; | |
1805 | s->ttyfd = -1; | |
1806 | error("session_pty_req: session %d alloc failed", s->self); | |
1807 | return 0; | |
1808 | } | |
1809 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1810 | ||
1811 | /* for SSH1 the tty modes length is not given */ | |
1812 | if (!compat20) | |
1813 | n_bytes = packet_remaining(); | |
1814 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1815 | ||
700318f3 | 1816 | if (!use_privsep) |
1817 | pty_setowner(s->pw, s->tty); | |
3c0ef626 | 1818 | |
1819 | /* Set window size from the packet. */ | |
1820 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1821 | ||
e9a17296 | 1822 | packet_check_eom(); |
3c0ef626 | 1823 | session_proctitle(s); |
1824 | return 1; | |
1825 | } | |
1826 | ||
1827 | static int | |
1828 | session_subsystem_req(Session *s) | |
1829 | { | |
1830 | struct stat st; | |
1831 | u_int len; | |
1832 | int success = 0; | |
1833 | char *cmd, *subsys = packet_get_string(&len); | |
665a873d | 1834 | u_int i; |
3c0ef626 | 1835 | |
e9a17296 | 1836 | packet_check_eom(); |
0fff78ff | 1837 | logit("subsystem request for %.100s", subsys); |
3c0ef626 | 1838 | |
1839 | for (i = 0; i < options.num_subsystems; i++) { | |
1840 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1841 | cmd = options.subsystem_command[i]; | |
1842 | if (stat(cmd, &st) < 0) { | |
1843 | error("subsystem: cannot stat %s: %s", cmd, | |
1844 | strerror(errno)); | |
1845 | break; | |
1846 | } | |
1847 | debug("subsystem: exec() %s", cmd); | |
1848 | s->is_subsystem = 1; | |
1849 | do_exec(s, cmd); | |
1850 | success = 1; | |
e9a17296 | 1851 | break; |
3c0ef626 | 1852 | } |
1853 | } | |
1854 | ||
1855 | if (!success) | |
0fff78ff | 1856 | logit("subsystem request for %.100s failed, subsystem not found", |
3c0ef626 | 1857 | subsys); |
1858 | ||
1859 | xfree(subsys); | |
1860 | return success; | |
1861 | } | |
1862 | ||
1863 | static int | |
1864 | session_x11_req(Session *s) | |
1865 | { | |
1866 | int success; | |
1867 | ||
665a873d | 1868 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
1869 | error("session_x11_req: session %d: " | |
1870 | "x11 fowarding already active", s->self); | |
1871 | return 0; | |
1872 | } | |
3c0ef626 | 1873 | s->single_connection = packet_get_char(); |
1874 | s->auth_proto = packet_get_string(NULL); | |
1875 | s->auth_data = packet_get_string(NULL); | |
1876 | s->screen = packet_get_int(); | |
e9a17296 | 1877 | packet_check_eom(); |
3c0ef626 | 1878 | |
1879 | success = session_setup_x11fwd(s); | |
1880 | if (!success) { | |
1881 | xfree(s->auth_proto); | |
1882 | xfree(s->auth_data); | |
1883 | s->auth_proto = NULL; | |
1884 | s->auth_data = NULL; | |
1885 | } | |
1886 | return success; | |
1887 | } | |
1888 | ||
1889 | static int | |
1890 | session_shell_req(Session *s) | |
1891 | { | |
e9a17296 | 1892 | packet_check_eom(); |
3c0ef626 | 1893 | do_exec(s, NULL); |
1894 | return 1; | |
1895 | } | |
1896 | ||
1897 | static int | |
1898 | session_exec_req(Session *s) | |
1899 | { | |
1900 | u_int len; | |
1901 | char *command = packet_get_string(&len); | |
e9a17296 | 1902 | packet_check_eom(); |
3c0ef626 | 1903 | do_exec(s, command); |
1904 | xfree(command); | |
1905 | return 1; | |
1906 | } | |
1907 | ||
0fff78ff | 1908 | static int |
1909 | session_break_req(Session *s) | |
1910 | { | |
0fff78ff | 1911 | |
c9f39d2c | 1912 | packet_get_int(); /* ignored */ |
0fff78ff | 1913 | packet_check_eom(); |
1914 | ||
1915 | if (s->ttyfd == -1 || | |
1916 | tcsendbreak(s->ttyfd, 0) < 0) | |
1917 | return 0; | |
1918 | return 1; | |
1919 | } | |
1920 | ||
c9f39d2c | 1921 | static int |
1922 | session_env_req(Session *s) | |
1923 | { | |
1924 | char *name, *val; | |
1925 | u_int name_len, val_len, i; | |
1926 | ||
1927 | name = packet_get_string(&name_len); | |
1928 | val = packet_get_string(&val_len); | |
1929 | packet_check_eom(); | |
1930 | ||
1931 | /* Don't set too many environment variables */ | |
1932 | if (s->num_env > 128) { | |
1933 | debug2("Ignoring env request %s: too many env vars", name); | |
1934 | goto fail; | |
1935 | } | |
1936 | ||
1937 | for (i = 0; i < options.num_accept_env; i++) { | |
1938 | if (match_pattern(name, options.accept_env[i])) { | |
1939 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
1940 | s->env = xrealloc(s->env, sizeof(*s->env) * | |
1941 | (s->num_env + 1)); | |
1942 | s->env[s->num_env].name = name; | |
1943 | s->env[s->num_env].val = val; | |
1944 | s->num_env++; | |
1945 | return (1); | |
1946 | } | |
1947 | } | |
1948 | debug2("Ignoring env request %s: disallowed name", name); | |
1949 | ||
1950 | fail: | |
1951 | xfree(name); | |
1952 | xfree(val); | |
1953 | return (0); | |
1954 | } | |
1955 | ||
3c0ef626 | 1956 | static int |
1957 | session_auth_agent_req(Session *s) | |
1958 | { | |
1959 | static int called = 0; | |
e9a17296 | 1960 | packet_check_eom(); |
3c0ef626 | 1961 | if (no_agent_forwarding_flag) { |
1962 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1963 | return 0; | |
1964 | } | |
1965 | if (called) { | |
1966 | return 0; | |
1967 | } else { | |
1968 | called = 1; | |
1969 | return auth_input_request_forwarding(s->pw); | |
1970 | } | |
1971 | } | |
1972 | ||
e9a17296 | 1973 | int |
1974 | session_input_channel_req(Channel *c, const char *rtype) | |
3c0ef626 | 1975 | { |
3c0ef626 | 1976 | int success = 0; |
3c0ef626 | 1977 | Session *s; |
3c0ef626 | 1978 | |
e9a17296 | 1979 | if ((s = session_by_channel(c->self)) == NULL) { |
0fff78ff | 1980 | logit("session_input_channel_req: no session %d req %.100s", |
e9a17296 | 1981 | c->self, rtype); |
1982 | return 0; | |
1983 | } | |
1984 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
3c0ef626 | 1985 | |
1986 | /* | |
1987 | * a session is in LARVAL state until a shell, a command | |
1988 | * or a subsystem is executed | |
1989 | */ | |
1990 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1991 | if (strcmp(rtype, "shell") == 0) { | |
1992 | success = session_shell_req(s); | |
1993 | } else if (strcmp(rtype, "exec") == 0) { | |
1994 | success = session_exec_req(s); | |
1995 | } else if (strcmp(rtype, "pty-req") == 0) { | |
1996 | success = session_pty_req(s); | |
1997 | } else if (strcmp(rtype, "x11-req") == 0) { | |
1998 | success = session_x11_req(s); | |
1999 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { | |
2000 | success = session_auth_agent_req(s); | |
2001 | } else if (strcmp(rtype, "subsystem") == 0) { | |
2002 | success = session_subsystem_req(s); | |
c9f39d2c | 2003 | } else if (strcmp(rtype, "env") == 0) { |
2004 | success = session_env_req(s); | |
3c0ef626 | 2005 | } |
2006 | } | |
2007 | if (strcmp(rtype, "window-change") == 0) { | |
2008 | success = session_window_change_req(s); | |
c9f39d2c | 2009 | } else if (strcmp(rtype, "break") == 0) { |
2010 | success = session_break_req(s); | |
3c0ef626 | 2011 | } |
c9f39d2c | 2012 | |
e9a17296 | 2013 | return success; |
3c0ef626 | 2014 | } |
2015 | ||
2016 | void | |
2017 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2018 | { | |
2019 | if (!compat20) | |
2020 | fatal("session_set_fds: called for proto != 2.0"); | |
2021 | /* | |
2022 | * now that have a child and a pipe to the child, | |
2023 | * we can activate our channel and register the fd's | |
2024 | */ | |
2025 | if (s->chanid == -1) | |
2026 | fatal("no channel for session %d", s->self); | |
2027 | channel_set_fds(s->chanid, | |
2028 | fdout, fdin, fderr, | |
2029 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
e9a17296 | 2030 | 1, |
2031 | CHAN_SES_WINDOW_DEFAULT); | |
3c0ef626 | 2032 | } |
2033 | ||
2034 | /* | |
2035 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2036 | * (e.g., due to a dropped connection). | |
2037 | */ | |
700318f3 | 2038 | void |
cdd66111 | 2039 | session_pty_cleanup2(Session *s) |
3c0ef626 | 2040 | { |
3c0ef626 | 2041 | if (s == NULL) { |
2042 | error("session_pty_cleanup: no session"); | |
2043 | return; | |
2044 | } | |
2045 | if (s->ttyfd == -1) | |
2046 | return; | |
2047 | ||
2048 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); | |
2049 | ||
2050 | /* Record that the user has logged out. */ | |
2051 | if (s->pid != 0) | |
e9a17296 | 2052 | record_logout(s->pid, s->tty, s->pw->pw_name); |
3c0ef626 | 2053 | |
2054 | /* Release the pseudo-tty. */ | |
700318f3 | 2055 | if (getuid() == 0) |
2056 | pty_release(s->tty); | |
3c0ef626 | 2057 | |
2058 | /* | |
2059 | * Close the server side of the socket pairs. We must do this after | |
2060 | * the pty cleanup, so that another process doesn't get this pty | |
2061 | * while we're still cleaning up. | |
2062 | */ | |
2063 | if (close(s->ptymaster) < 0) | |
700318f3 | 2064 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
3c0ef626 | 2065 | |
2066 | /* unlink pty from session */ | |
2067 | s->ttyfd = -1; | |
2068 | } | |
2069 | ||
700318f3 | 2070 | void |
cdd66111 | 2071 | session_pty_cleanup(Session *s) |
700318f3 | 2072 | { |
cdd66111 | 2073 | PRIVSEP(session_pty_cleanup2(s)); |
700318f3 | 2074 | } |
2075 | ||
41b2f314 | 2076 | static char * |
2077 | sig2name(int sig) | |
2078 | { | |
2079 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2080 | SSH_SIG(ABRT); | |
2081 | SSH_SIG(ALRM); | |
2082 | SSH_SIG(FPE); | |
2083 | SSH_SIG(HUP); | |
2084 | SSH_SIG(ILL); | |
2085 | SSH_SIG(INT); | |
2086 | SSH_SIG(KILL); | |
2087 | SSH_SIG(PIPE); | |
2088 | SSH_SIG(QUIT); | |
2089 | SSH_SIG(SEGV); | |
2090 | SSH_SIG(TERM); | |
2091 | SSH_SIG(USR1); | |
2092 | SSH_SIG(USR2); | |
2093 | #undef SSH_SIG | |
2094 | return "SIG@openssh.com"; | |
2095 | } | |
2096 | ||
665a873d | 2097 | static void |
2098 | session_close_x11(int id) | |
2099 | { | |
2100 | Channel *c; | |
2101 | ||
2102 | if ((c = channel_lookup(id)) == NULL) { | |
2103 | debug("session_close_x11: x11 channel %d missing", id); | |
2104 | } else { | |
2105 | /* Detach X11 listener */ | |
2106 | debug("session_close_x11: detach x11 channel %d", id); | |
2107 | channel_cancel_cleanup(id); | |
2108 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2109 | chan_mark_dead(c); | |
2110 | } | |
2111 | } | |
2112 | ||
2113 | static void | |
2114 | session_close_single_x11(int id, void *arg) | |
2115 | { | |
2116 | Session *s; | |
2117 | u_int i; | |
2118 | ||
2119 | debug3("session_close_single_x11: channel %d", id); | |
2120 | channel_cancel_cleanup(id); | |
2121 | if ((s = session_by_x11_channel(id)) == NULL) | |
2122 | fatal("session_close_single_x11: no x11 channel %d", id); | |
2123 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2124 | debug("session_close_single_x11: session %d: " | |
2125 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2126 | /* | |
2127 | * The channel "id" is already closing, but make sure we | |
2128 | * close all of its siblings. | |
2129 | */ | |
2130 | if (s->x11_chanids[i] != id) | |
2131 | session_close_x11(s->x11_chanids[i]); | |
2132 | } | |
2133 | xfree(s->x11_chanids); | |
2134 | s->x11_chanids = NULL; | |
2135 | if (s->display) { | |
2136 | xfree(s->display); | |
2137 | s->display = NULL; | |
2138 | } | |
2139 | if (s->auth_proto) { | |
2140 | xfree(s->auth_proto); | |
2141 | s->auth_proto = NULL; | |
2142 | } | |
2143 | if (s->auth_data) { | |
2144 | xfree(s->auth_data); | |
2145 | s->auth_data = NULL; | |
2146 | } | |
2147 | if (s->auth_display) { | |
2148 | xfree(s->auth_display); | |
2149 | s->auth_display = NULL; | |
2150 | } | |
2151 | } | |
2152 | ||
3c0ef626 | 2153 | static void |
2154 | session_exit_message(Session *s, int status) | |
2155 | { | |
2156 | Channel *c; | |
665a873d | 2157 | u_int i; |
e9a17296 | 2158 | |
2159 | if ((c = channel_lookup(s->chanid)) == NULL) | |
3c0ef626 | 2160 | fatal("session_exit_message: session %d: no channel %d", |
2161 | s->self, s->chanid); | |
f5799ae1 | 2162 | debug("session_exit_message: session %d channel %d pid %ld", |
2163 | s->self, s->chanid, (long)s->pid); | |
3c0ef626 | 2164 | |
2165 | if (WIFEXITED(status)) { | |
e9a17296 | 2166 | channel_request_start(s->chanid, "exit-status", 0); |
3c0ef626 | 2167 | packet_put_int(WEXITSTATUS(status)); |
2168 | packet_send(); | |
2169 | } else if (WIFSIGNALED(status)) { | |
e9a17296 | 2170 | channel_request_start(s->chanid, "exit-signal", 0); |
41b2f314 | 2171 | packet_put_cstring(sig2name(WTERMSIG(status))); |
3c0ef626 | 2172 | #ifdef WCOREDUMP |
2173 | packet_put_char(WCOREDUMP(status)); | |
2174 | #else /* WCOREDUMP */ | |
2175 | packet_put_char(0); | |
2176 | #endif /* WCOREDUMP */ | |
2177 | packet_put_cstring(""); | |
2178 | packet_put_cstring(""); | |
2179 | packet_send(); | |
2180 | } else { | |
2181 | /* Some weird exit cause. Just exit. */ | |
2182 | packet_disconnect("wait returned status %04x.", status); | |
2183 | } | |
2184 | ||
2185 | /* disconnect channel */ | |
2186 | debug("session_exit_message: release channel %d", s->chanid); | |
2187 | channel_cancel_cleanup(s->chanid); | |
2188 | /* | |
2189 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2190 | * interested in data we write. | |
2191 | * Note that we must not call 'chan_read_failed', since there could | |
2192 | * be some more data waiting in the pipe. | |
2193 | */ | |
2194 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2195 | chan_write_failed(c); | |
2196 | s->chanid = -1; | |
665a873d | 2197 | |
2198 | /* Close any X11 listeners associated with this session */ | |
2199 | if (s->x11_chanids != NULL) { | |
2200 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2201 | session_close_x11(s->x11_chanids[i]); | |
2202 | s->x11_chanids[i] = -1; | |
2203 | } | |
2204 | } | |
3c0ef626 | 2205 | } |
2206 | ||
700318f3 | 2207 | void |
3c0ef626 | 2208 | session_close(Session *s) |
2209 | { | |
665a873d | 2210 | u_int i; |
c9f39d2c | 2211 | |
f5799ae1 | 2212 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
cdd66111 | 2213 | if (s->ttyfd != -1) |
3c0ef626 | 2214 | session_pty_cleanup(s); |
3c0ef626 | 2215 | if (s->term) |
2216 | xfree(s->term); | |
2217 | if (s->display) | |
2218 | xfree(s->display); | |
665a873d | 2219 | if (s->x11_chanids) |
2220 | xfree(s->x11_chanids); | |
e9a17296 | 2221 | if (s->auth_display) |
2222 | xfree(s->auth_display); | |
3c0ef626 | 2223 | if (s->auth_data) |
2224 | xfree(s->auth_data); | |
2225 | if (s->auth_proto) | |
2226 | xfree(s->auth_proto); | |
2227 | s->used = 0; | |
c9f39d2c | 2228 | for (i = 0; i < s->num_env; i++) { |
2229 | xfree(s->env[i].name); | |
2230 | xfree(s->env[i].val); | |
2231 | } | |
2232 | if (s->env != NULL) | |
2233 | xfree(s->env); | |
3c0ef626 | 2234 | session_proctitle(s); |
2235 | } | |
2236 | ||
2237 | void | |
2238 | session_close_by_pid(pid_t pid, int status) | |
2239 | { | |
2240 | Session *s = session_by_pid(pid); | |
2241 | if (s == NULL) { | |
f5799ae1 | 2242 | debug("session_close_by_pid: no session for pid %ld", |
2243 | (long)pid); | |
3c0ef626 | 2244 | return; |
2245 | } | |
2246 | if (s->chanid != -1) | |
2247 | session_exit_message(s, status); | |
2248 | session_close(s); | |
2249 | } | |
2250 | ||
2251 | /* | |
2252 | * this is called when a channel dies before | |
2253 | * the session 'child' itself dies | |
2254 | */ | |
2255 | void | |
2256 | session_close_by_channel(int id, void *arg) | |
2257 | { | |
2258 | Session *s = session_by_channel(id); | |
665a873d | 2259 | |
3c0ef626 | 2260 | if (s == NULL) { |
2261 | debug("session_close_by_channel: no session for id %d", id); | |
2262 | return; | |
2263 | } | |
f5799ae1 | 2264 | debug("session_close_by_channel: channel %d child %ld", |
2265 | id, (long)s->pid); | |
3c0ef626 | 2266 | if (s->pid != 0) { |
2267 | debug("session_close_by_channel: channel %d: has child", id); | |
2268 | /* | |
2269 | * delay detach of session, but release pty, since | |
2270 | * the fd's to the child are already closed | |
2271 | */ | |
cdd66111 | 2272 | if (s->ttyfd != -1) |
3c0ef626 | 2273 | session_pty_cleanup(s); |
3c0ef626 | 2274 | return; |
2275 | } | |
2276 | /* detach by removing callback */ | |
2277 | channel_cancel_cleanup(s->chanid); | |
2278 | s->chanid = -1; | |
2279 | session_close(s); | |
2280 | } | |
2281 | ||
2282 | void | |
700318f3 | 2283 | session_destroy_all(void (*closefunc)(Session *)) |
3c0ef626 | 2284 | { |
2285 | int i; | |
e9a17296 | 2286 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2287 | Session *s = &sessions[i]; |
700318f3 | 2288 | if (s->used) { |
2289 | if (closefunc != NULL) | |
2290 | closefunc(s); | |
2291 | else | |
2292 | session_close(s); | |
2293 | } | |
3c0ef626 | 2294 | } |
2295 | } | |
2296 | ||
2297 | static char * | |
2298 | session_tty_list(void) | |
2299 | { | |
2300 | static char buf[1024]; | |
2301 | int i; | |
6a9b3198 | 2302 | char *cp; |
2303 | ||
3c0ef626 | 2304 | buf[0] = '\0'; |
e9a17296 | 2305 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2306 | Session *s = &sessions[i]; |
2307 | if (s->used && s->ttyfd != -1) { | |
cdd66111 | 2308 | |
6a9b3198 | 2309 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2310 | cp = strrchr(s->tty, '/'); | |
2311 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2312 | } else | |
2313 | cp = s->tty + 5; | |
cdd66111 | 2314 | |
3c0ef626 | 2315 | if (buf[0] != '\0') |
2316 | strlcat(buf, ",", sizeof buf); | |
6a9b3198 | 2317 | strlcat(buf, cp, sizeof buf); |
3c0ef626 | 2318 | } |
2319 | } | |
2320 | if (buf[0] == '\0') | |
2321 | strlcpy(buf, "notty", sizeof buf); | |
2322 | return buf; | |
2323 | } | |
2324 | ||
2325 | void | |
2326 | session_proctitle(Session *s) | |
2327 | { | |
2328 | if (s->pw == NULL) | |
2329 | error("no user for session %d", s->self); | |
2330 | else | |
2331 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2332 | } | |
2333 | ||
2334 | int | |
2335 | session_setup_x11fwd(Session *s) | |
2336 | { | |
2337 | struct stat st; | |
e9a17296 | 2338 | char display[512], auth_display[512]; |
2339 | char hostname[MAXHOSTNAMELEN]; | |
665a873d | 2340 | u_int i; |
3c0ef626 | 2341 | |
2342 | if (no_x11_forwarding_flag) { | |
2343 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2344 | return 0; | |
2345 | } | |
2346 | if (!options.x11_forwarding) { | |
2347 | debug("X11 forwarding disabled in server configuration file."); | |
2348 | return 0; | |
2349 | } | |
2350 | if (!options.xauth_location || | |
2351 | (stat(options.xauth_location, &st) == -1)) { | |
2352 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2353 | return 0; | |
2354 | } | |
2355 | if (options.use_login) { | |
2356 | packet_send_debug("X11 forwarding disabled; " | |
2357 | "not compatible with UseLogin=yes."); | |
2358 | return 0; | |
2359 | } | |
2360 | if (s->display != NULL) { | |
2361 | debug("X11 display already set."); | |
2362 | return 0; | |
2363 | } | |
680cee3b | 2364 | if (x11_create_display_inet(options.x11_display_offset, |
2365 | options.x11_use_localhost, s->single_connection, | |
665a873d | 2366 | &s->display_number, &s->x11_chanids) == -1) { |
3c0ef626 | 2367 | debug("x11_create_display_inet failed."); |
2368 | return 0; | |
2369 | } | |
665a873d | 2370 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2371 | channel_register_cleanup(s->x11_chanids[i], | |
2372 | session_close_single_x11); | |
2373 | } | |
e9a17296 | 2374 | |
2375 | /* Set up a suitable value for the DISPLAY variable. */ | |
2376 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2377 | fatal("gethostname: %.100s", strerror(errno)); | |
2378 | /* | |
2379 | * auth_display must be used as the displayname when the | |
2380 | * authorization entry is added with xauth(1). This will be | |
2381 | * different than the DISPLAY string for localhost displays. | |
2382 | */ | |
2383 | if (options.x11_use_localhost) { | |
680cee3b | 2384 | snprintf(display, sizeof display, "localhost:%u.%u", |
e9a17296 | 2385 | s->display_number, s->screen); |
680cee3b | 2386 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
e9a17296 | 2387 | s->display_number, s->screen); |
2388 | s->display = xstrdup(display); | |
2389 | s->auth_display = xstrdup(auth_display); | |
2390 | } else { | |
2391 | #ifdef IPADDR_IN_DISPLAY | |
2392 | struct hostent *he; | |
2393 | struct in_addr my_addr; | |
2394 | ||
2395 | he = gethostbyname(hostname); | |
2396 | if (he == NULL) { | |
2397 | error("Can't get IP address for X11 DISPLAY."); | |
2398 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2399 | return 0; | |
2400 | } | |
2401 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
680cee3b | 2402 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
e9a17296 | 2403 | s->display_number, s->screen); |
2404 | #else | |
680cee3b | 2405 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
e9a17296 | 2406 | s->display_number, s->screen); |
2407 | #endif | |
2408 | s->display = xstrdup(display); | |
2409 | s->auth_display = xstrdup(display); | |
2410 | } | |
2411 | ||
3c0ef626 | 2412 | return 1; |
2413 | } | |
2414 | ||
2415 | static void | |
2416 | do_authenticated2(Authctxt *authctxt) | |
2417 | { | |
2418 | server_loop2(authctxt); | |
cdd66111 | 2419 | } |
2420 | ||
2421 | void | |
2422 | do_cleanup(Authctxt *authctxt) | |
2423 | { | |
2424 | static int called = 0; | |
2425 | ||
2426 | debug("do_cleanup"); | |
2427 | ||
2428 | /* no cleanup if we're in the child for login shell */ | |
2429 | if (is_child) | |
2430 | return; | |
2431 | ||
2432 | /* avoid double cleanup */ | |
2433 | if (called) | |
2434 | return; | |
2435 | called = 1; | |
2436 | ||
2437 | if (authctxt == NULL) | |
2438 | return; | |
2439 | #ifdef KRB5 | |
2440 | if (options.kerberos_ticket_cleanup && | |
2441 | authctxt->krb5_ctx) | |
2442 | krb5_cleanup_proc(authctxt); | |
0fff78ff | 2443 | #endif |
cdd66111 | 2444 | |
2445 | #ifdef GSSAPI | |
2446 | if (compat20 && options.gss_cleanup_creds) | |
2447 | ssh_gssapi_cleanup_creds(); | |
2448 | #endif | |
2449 | ||
2450 | #ifdef USE_PAM | |
2451 | if (options.use_pam) { | |
2452 | sshpam_cleanup(); | |
2453 | sshpam_thread_cleanup(); | |
2454 | } | |
2455 | #endif | |
2456 | ||
2457 | /* remove agent socket */ | |
2458 | auth_sock_cleanup_proc(authctxt->pw); | |
2459 | ||
2460 | /* | |
2461 | * Cleanup ptys/utmp only if privsep is disabled, | |
2462 | * or if running in monitor. | |
2463 | */ | |
2464 | if (!use_privsep || mm_is_monitor()) | |
2465 | session_destroy_all(session_pty_cleanup2); | |
3c0ef626 | 2466 | } |