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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" | |
2c06c99b | 36 | RCSID("$OpenBSD: session.c,v 1.191 2005/12/24 02:27:41 djm 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. */ | |
d4e9cd2c | 189 | /* this shouldn't matter if its hpn or not - cjr */ |
f5799ae1 | 190 | nc = channel_new("auth socket", |
191 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
192 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0fff78ff | 193 | 0, "auth socket", 1); |
f5799ae1 | 194 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
195 | return 1; | |
196 | } | |
197 | ||
cdd66111 | 198 | static void |
199 | display_loginmsg(void) | |
200 | { | |
665a873d | 201 | if (buffer_len(&loginmsg) > 0) { |
202 | buffer_append(&loginmsg, "\0", 1); | |
203 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
204 | buffer_clear(&loginmsg); | |
205 | } | |
cdd66111 | 206 | } |
f5799ae1 | 207 | |
3c0ef626 | 208 | void |
209 | do_authenticated(Authctxt *authctxt) | |
210 | { | |
6a9b3198 | 211 | setproctitle("%s", authctxt->pw->pw_name); |
212 | ||
3c0ef626 | 213 | /* setup the channel layer */ |
214 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
215 | channel_permit_all_opens(); | |
216 | ||
217 | if (compat20) | |
218 | do_authenticated2(authctxt); | |
219 | else | |
220 | do_authenticated1(authctxt); | |
221 | ||
cdd66111 | 222 | do_cleanup(authctxt); |
3c0ef626 | 223 | } |
224 | ||
225 | /* | |
226 | * Prepares for an interactive session. This is called after the user has | |
227 | * been successfully authenticated. During this message exchange, pseudo | |
228 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
229 | * are requested, etc. | |
230 | */ | |
231 | static void | |
232 | do_authenticated1(Authctxt *authctxt) | |
233 | { | |
234 | Session *s; | |
235 | char *command; | |
e9a17296 | 236 | int success, type, screen_flag; |
680cee3b | 237 | int enable_compression_after_reply = 0; |
238 | u_int proto_len, data_len, dlen, compression_level = 0; | |
3c0ef626 | 239 | |
240 | s = session_new(); | |
996d5e62 | 241 | if (s == NULL) { |
242 | error("no more sessions"); | |
243 | return; | |
244 | } | |
3c0ef626 | 245 | s->authctxt = authctxt; |
246 | s->pw = authctxt->pw; | |
247 | ||
248 | /* | |
249 | * We stay in this loop until the client requests to execute a shell | |
250 | * or a command. | |
251 | */ | |
252 | for (;;) { | |
253 | success = 0; | |
254 | ||
255 | /* Get a packet from the client. */ | |
e9a17296 | 256 | type = packet_read(); |
3c0ef626 | 257 | |
258 | /* Process the packet. */ | |
259 | switch (type) { | |
260 | case SSH_CMSG_REQUEST_COMPRESSION: | |
3c0ef626 | 261 | compression_level = packet_get_int(); |
e9a17296 | 262 | packet_check_eom(); |
3c0ef626 | 263 | if (compression_level < 1 || compression_level > 9) { |
c9f39d2c | 264 | packet_send_debug("Received invalid compression level %d.", |
e9a17296 | 265 | compression_level); |
3c0ef626 | 266 | break; |
267 | } | |
665a873d | 268 | if (options.compression == COMP_NONE) { |
f5799ae1 | 269 | debug2("compression disabled"); |
270 | break; | |
271 | } | |
3c0ef626 | 272 | /* Enable compression after we have responded with SUCCESS. */ |
273 | enable_compression_after_reply = 1; | |
274 | success = 1; | |
275 | break; | |
276 | ||
277 | case SSH_CMSG_REQUEST_PTY: | |
278 | success = session_pty_req(s); | |
279 | break; | |
280 | ||
281 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
282 | s->auth_proto = packet_get_string(&proto_len); | |
283 | s->auth_data = packet_get_string(&data_len); | |
284 | ||
285 | screen_flag = packet_get_protocol_flags() & | |
286 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
287 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
288 | ||
289 | if (packet_remaining() == 4) { | |
290 | if (!screen_flag) | |
291 | debug2("Buggy client: " | |
292 | "X11 screen flag missing"); | |
293 | s->screen = packet_get_int(); | |
294 | } else { | |
295 | s->screen = 0; | |
296 | } | |
e9a17296 | 297 | packet_check_eom(); |
3c0ef626 | 298 | success = session_setup_x11fwd(s); |
299 | if (!success) { | |
300 | xfree(s->auth_proto); | |
301 | xfree(s->auth_data); | |
302 | s->auth_proto = NULL; | |
303 | s->auth_data = NULL; | |
304 | } | |
305 | break; | |
306 | ||
307 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
308 | if (no_agent_forwarding_flag || compat13) { | |
309 | debug("Authentication agent forwarding not permitted for this authentication."); | |
310 | break; | |
311 | } | |
312 | debug("Received authentication agent forwarding request."); | |
313 | success = auth_input_request_forwarding(s->pw); | |
314 | break; | |
315 | ||
316 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
317 | if (no_port_forwarding_flag) { | |
318 | debug("Port forwarding not permitted for this authentication."); | |
319 | break; | |
320 | } | |
321 | if (!options.allow_tcp_forwarding) { | |
322 | debug("Port forwarding not permitted."); | |
323 | break; | |
324 | } | |
325 | debug("Received TCP/IP port forwarding request."); | |
d4e9cd2c | 326 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports, |
327 | options.hpn_disabled, | |
328 | options.hpn_buffer_size); | |
3c0ef626 | 329 | success = 1; |
330 | break; | |
331 | ||
332 | case SSH_CMSG_MAX_PACKET_SIZE: | |
333 | if (packet_set_maxsize(packet_get_int()) > 0) | |
334 | success = 1; | |
335 | break; | |
e9a17296 | 336 | |
3c0ef626 | 337 | case SSH_CMSG_EXEC_SHELL: |
338 | case SSH_CMSG_EXEC_CMD: | |
339 | if (type == SSH_CMSG_EXEC_CMD) { | |
340 | command = packet_get_string(&dlen); | |
341 | debug("Exec command '%.500s'", command); | |
342 | do_exec(s, command); | |
343 | xfree(command); | |
344 | } else { | |
345 | do_exec(s, NULL); | |
346 | } | |
e9a17296 | 347 | packet_check_eom(); |
3c0ef626 | 348 | session_close(s); |
349 | return; | |
350 | ||
351 | default: | |
352 | /* | |
353 | * Any unknown messages in this phase are ignored, | |
354 | * and a failure message is returned. | |
355 | */ | |
0fff78ff | 356 | logit("Unknown packet type received after authentication: %d", type); |
3c0ef626 | 357 | } |
358 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
359 | packet_send(); | |
360 | packet_write_wait(); | |
361 | ||
362 | /* Enable compression now that we have replied if appropriate. */ | |
363 | if (enable_compression_after_reply) { | |
364 | enable_compression_after_reply = 0; | |
365 | packet_start_compression(compression_level); | |
366 | } | |
367 | } | |
368 | } | |
369 | ||
370 | /* | |
371 | * This is called to fork and execute a command when we have no tty. This | |
372 | * will call do_child from the child, and server_loop from the parent after | |
373 | * setting up file descriptors and such. | |
374 | */ | |
375 | void | |
376 | do_exec_no_pty(Session *s, const char *command) | |
377 | { | |
f5799ae1 | 378 | pid_t pid; |
3c0ef626 | 379 | |
380 | #ifdef USE_PIPES | |
381 | int pin[2], pout[2], perr[2]; | |
382 | /* Allocate pipes for communicating with the program. */ | |
383 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
384 | packet_disconnect("Could not create pipes: %.100s", | |
385 | strerror(errno)); | |
386 | #else /* USE_PIPES */ | |
387 | int inout[2], err[2]; | |
388 | /* Uses socket pairs to communicate with the program. */ | |
389 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
390 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
391 | packet_disconnect("Could not create socket pairs: %.100s", | |
392 | strerror(errno)); | |
393 | #endif /* USE_PIPES */ | |
394 | if (s == NULL) | |
395 | fatal("do_exec_no_pty: no session"); | |
396 | ||
397 | session_proctitle(s); | |
398 | ||
399 | #if defined(USE_PAM) | |
cdd66111 | 400 | if (options.use_pam && !use_privsep) |
0fff78ff | 401 | do_pam_setcred(1); |
3c0ef626 | 402 | #endif /* USE_PAM */ |
403 | ||
404 | /* Fork the child. */ | |
405 | if ((pid = fork()) == 0) { | |
cdd66111 | 406 | is_child = 1; |
41b2f314 | 407 | |
3c0ef626 | 408 | /* Child. Reinitialize the log since the pid has changed. */ |
409 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
410 | ||
411 | /* | |
412 | * Create a new session and process group since the 4.4BSD | |
413 | * setlogin() affects the entire process group. | |
414 | */ | |
415 | if (setsid() < 0) | |
416 | error("setsid failed: %.100s", strerror(errno)); | |
417 | ||
418 | #ifdef USE_PIPES | |
419 | /* | |
420 | * Redirect stdin. We close the parent side of the socket | |
421 | * pair, and make the child side the standard input. | |
422 | */ | |
423 | close(pin[1]); | |
424 | if (dup2(pin[0], 0) < 0) | |
425 | perror("dup2 stdin"); | |
426 | close(pin[0]); | |
427 | ||
428 | /* Redirect stdout. */ | |
429 | close(pout[0]); | |
430 | if (dup2(pout[1], 1) < 0) | |
431 | perror("dup2 stdout"); | |
432 | close(pout[1]); | |
433 | ||
434 | /* Redirect stderr. */ | |
435 | close(perr[0]); | |
436 | if (dup2(perr[1], 2) < 0) | |
437 | perror("dup2 stderr"); | |
438 | close(perr[1]); | |
439 | #else /* USE_PIPES */ | |
440 | /* | |
441 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
442 | * use the same socket, as some programs (particularly rdist) | |
443 | * seem to depend on it. | |
444 | */ | |
445 | close(inout[1]); | |
446 | close(err[1]); | |
447 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
448 | perror("dup2 stdin"); | |
449 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
450 | perror("dup2 stdout"); | |
451 | if (dup2(err[0], 2) < 0) /* stderr */ | |
452 | perror("dup2 stderr"); | |
453 | #endif /* USE_PIPES */ | |
454 | ||
41b2f314 | 455 | #ifdef _UNICOS |
456 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
457 | #endif | |
458 | ||
3c0ef626 | 459 | /* Do processing for the child (exec command etc). */ |
460 | do_child(s, command); | |
461 | /* NOTREACHED */ | |
462 | } | |
41b2f314 | 463 | #ifdef _UNICOS |
464 | signal(WJSIGNAL, cray_job_termination_handler); | |
465 | #endif /* _UNICOS */ | |
3c0ef626 | 466 | #ifdef HAVE_CYGWIN |
467 | if (is_winnt) | |
468 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
469 | #endif | |
470 | if (pid < 0) | |
471 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
472 | s->pid = pid; | |
473 | /* Set interactive/non-interactive mode. */ | |
474 | packet_set_interactive(s->display != NULL); | |
475 | #ifdef USE_PIPES | |
476 | /* We are the parent. Close the child sides of the pipes. */ | |
477 | close(pin[0]); | |
478 | close(pout[1]); | |
479 | close(perr[1]); | |
480 | ||
481 | if (compat20) { | |
c9f39d2c | 482 | if (s->is_subsystem) { |
483 | close(perr[0]); | |
484 | perr[0] = -1; | |
485 | } | |
486 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
3c0ef626 | 487 | } else { |
488 | /* Enter the interactive session. */ | |
489 | server_loop(pid, pin[1], pout[0], perr[0]); | |
490 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ | |
491 | } | |
492 | #else /* USE_PIPES */ | |
493 | /* We are the parent. Close the child sides of the socket pairs. */ | |
494 | close(inout[0]); | |
495 | close(err[0]); | |
496 | ||
99be0775 | 497 | /* |
498 | * Clear loginmsg, since it's the child's responsibility to display | |
499 | * it to the user, otherwise multiple sessions may accumulate | |
500 | * multiple copies of the login messages. | |
501 | */ | |
502 | buffer_clear(&loginmsg); | |
503 | ||
3c0ef626 | 504 | /* |
505 | * Enter the interactive session. Note: server_loop must be able to | |
506 | * handle the case that fdin and fdout are the same. | |
507 | */ | |
508 | if (compat20) { | |
509 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); | |
510 | } else { | |
511 | server_loop(pid, inout[1], inout[1], err[1]); | |
512 | /* server_loop has closed inout[1] and err[1]. */ | |
513 | } | |
514 | #endif /* USE_PIPES */ | |
515 | } | |
516 | ||
517 | /* | |
518 | * This is called to fork and execute a command when we have a tty. This | |
519 | * will call do_child from the child, and server_loop from the parent after | |
520 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
521 | * lastlog, and other such operations. | |
522 | */ | |
523 | void | |
524 | do_exec_pty(Session *s, const char *command) | |
525 | { | |
526 | int fdout, ptyfd, ttyfd, ptymaster; | |
527 | pid_t pid; | |
528 | ||
529 | if (s == NULL) | |
530 | fatal("do_exec_pty: no session"); | |
531 | ptyfd = s->ptyfd; | |
532 | ttyfd = s->ttyfd; | |
533 | ||
534 | #if defined(USE_PAM) | |
0fff78ff | 535 | if (options.use_pam) { |
536 | do_pam_set_tty(s->tty); | |
cdd66111 | 537 | if (!use_privsep) |
538 | do_pam_setcred(1); | |
0fff78ff | 539 | } |
3c0ef626 | 540 | #endif |
541 | ||
542 | /* Fork the child. */ | |
543 | if ((pid = fork()) == 0) { | |
cdd66111 | 544 | is_child = 1; |
3c0ef626 | 545 | |
546 | /* Child. Reinitialize the log because the pid has changed. */ | |
547 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
548 | /* Close the master side of the pseudo tty. */ | |
549 | close(ptyfd); | |
550 | ||
551 | /* Make the pseudo tty our controlling tty. */ | |
552 | pty_make_controlling_tty(&ttyfd, s->tty); | |
553 | ||
554 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ | |
555 | if (dup2(ttyfd, 0) < 0) | |
556 | error("dup2 stdin: %s", strerror(errno)); | |
557 | if (dup2(ttyfd, 1) < 0) | |
558 | error("dup2 stdout: %s", strerror(errno)); | |
559 | if (dup2(ttyfd, 2) < 0) | |
560 | error("dup2 stderr: %s", strerror(errno)); | |
561 | ||
562 | /* Close the extra descriptor for the pseudo tty. */ | |
563 | close(ttyfd); | |
564 | ||
565 | /* record login, etc. similar to login(1) */ | |
566 | #ifndef HAVE_OSF_SIA | |
41b2f314 | 567 | if (!(options.use_login && command == NULL)) { |
568 | #ifdef _UNICOS | |
569 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
570 | #endif /* _UNICOS */ | |
3c0ef626 | 571 | do_login(s, command); |
41b2f314 | 572 | } |
3c0ef626 | 573 | # ifdef LOGIN_NEEDS_UTMPX |
574 | else | |
575 | do_pre_login(s); | |
576 | # endif | |
577 | #endif | |
578 | ||
579 | /* Do common processing for the child, such as execing the command. */ | |
580 | do_child(s, command); | |
581 | /* NOTREACHED */ | |
582 | } | |
41b2f314 | 583 | #ifdef _UNICOS |
584 | signal(WJSIGNAL, cray_job_termination_handler); | |
585 | #endif /* _UNICOS */ | |
3c0ef626 | 586 | #ifdef HAVE_CYGWIN |
587 | if (is_winnt) | |
588 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
589 | #endif | |
590 | if (pid < 0) | |
591 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
592 | s->pid = pid; | |
593 | ||
594 | /* Parent. Close the slave side of the pseudo tty. */ | |
595 | close(ttyfd); | |
596 | ||
597 | /* | |
598 | * Create another descriptor of the pty master side for use as the | |
599 | * standard input. We could use the original descriptor, but this | |
600 | * simplifies code in server_loop. The descriptor is bidirectional. | |
601 | */ | |
602 | fdout = dup(ptyfd); | |
603 | if (fdout < 0) | |
604 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
605 | ||
606 | /* we keep a reference to the pty master */ | |
607 | ptymaster = dup(ptyfd); | |
608 | if (ptymaster < 0) | |
609 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
610 | s->ptymaster = ptymaster; | |
611 | ||
612 | /* Enter interactive session. */ | |
613 | packet_set_interactive(1); | |
614 | if (compat20) { | |
615 | session_set_fds(s, ptyfd, fdout, -1); | |
616 | } else { | |
617 | server_loop(pid, ptyfd, fdout, -1); | |
618 | /* server_loop _has_ closed ptyfd and fdout. */ | |
619 | } | |
620 | } | |
621 | ||
622 | #ifdef LOGIN_NEEDS_UTMPX | |
623 | static void | |
624 | do_pre_login(Session *s) | |
625 | { | |
626 | socklen_t fromlen; | |
627 | struct sockaddr_storage from; | |
628 | pid_t pid = getpid(); | |
629 | ||
630 | /* | |
631 | * Get IP address of client. If the connection is not a socket, let | |
632 | * the address be 0.0.0.0. | |
633 | */ | |
634 | memset(&from, 0, sizeof(from)); | |
41b2f314 | 635 | fromlen = sizeof(from); |
3c0ef626 | 636 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 637 | if (getpeername(packet_get_connection_in(), |
e9a17296 | 638 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 639 | debug("getpeername: %.100s", strerror(errno)); |
cdd66111 | 640 | cleanup_exit(255); |
3c0ef626 | 641 | } |
642 | } | |
643 | ||
644 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
0fff78ff | 645 | get_remote_name_or_ip(utmp_len, options.use_dns), |
6a9b3198 | 646 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 647 | } |
648 | #endif | |
649 | ||
650 | /* | |
651 | * This is called to fork and execute a command. If another command is | |
652 | * to be forced, execute that instead. | |
653 | */ | |
654 | void | |
655 | do_exec(Session *s, const char *command) | |
656 | { | |
657 | if (forced_command) { | |
658 | original_command = command; | |
659 | command = forced_command; | |
660 | debug("Forced command '%.900s'", command); | |
661 | } | |
662 | ||
996d5e62 | 663 | #ifdef SSH_AUDIT_EVENTS |
664 | if (command != NULL) | |
665 | PRIVSEP(audit_run_command(command)); | |
666 | else if (s->ttyfd == -1) { | |
667 | char *shell = s->pw->pw_shell; | |
668 | ||
669 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
670 | shell =_PATH_BSHELL; | |
671 | PRIVSEP(audit_run_command(shell)); | |
0fff78ff | 672 | } |
673 | #endif | |
674 | ||
3c0ef626 | 675 | if (s->ttyfd != -1) |
676 | do_exec_pty(s, command); | |
677 | else | |
678 | do_exec_no_pty(s, command); | |
679 | ||
680 | original_command = NULL; | |
3c0ef626 | 681 | |
c9f39d2c | 682 | /* |
683 | * Clear loginmsg: it's the child's responsibility to display | |
684 | * it to the user, otherwise multiple sessions may accumulate | |
685 | * multiple copies of the login messages. | |
686 | */ | |
687 | buffer_clear(&loginmsg); | |
688 | } | |
e9a17296 | 689 | |
3c0ef626 | 690 | /* administrative, login(1)-like work */ |
691 | void | |
692 | do_login(Session *s, const char *command) | |
693 | { | |
3c0ef626 | 694 | socklen_t fromlen; |
695 | struct sockaddr_storage from; | |
3c0ef626 | 696 | struct passwd * pw = s->pw; |
697 | pid_t pid = getpid(); | |
698 | ||
699 | /* | |
700 | * Get IP address of client. If the connection is not a socket, let | |
701 | * the address be 0.0.0.0. | |
702 | */ | |
703 | memset(&from, 0, sizeof(from)); | |
6a9b3198 | 704 | fromlen = sizeof(from); |
3c0ef626 | 705 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 706 | if (getpeername(packet_get_connection_in(), |
e9a17296 | 707 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 708 | debug("getpeername: %.100s", strerror(errno)); |
cdd66111 | 709 | cleanup_exit(255); |
3c0ef626 | 710 | } |
711 | } | |
712 | ||
3c0ef626 | 713 | /* Record that there was a login on that tty from the remote host. */ |
700318f3 | 714 | if (!use_privsep) |
715 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
716 | get_remote_name_or_ip(utmp_len, | |
0fff78ff | 717 | options.use_dns), |
41b2f314 | 718 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 719 | |
720 | #ifdef USE_PAM | |
721 | /* | |
722 | * If password change is needed, do it now. | |
723 | * This needs to occur before the ~/.hushlogin check. | |
724 | */ | |
cdd66111 | 725 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
726 | display_loginmsg(); | |
3c0ef626 | 727 | do_pam_chauthtok(); |
cdd66111 | 728 | s->authctxt->force_pwchange = 0; |
0fff78ff | 729 | /* XXX - signal [net] parent to enable forwardings */ |
3c0ef626 | 730 | } |
731 | #endif | |
732 | ||
733 | if (check_quietlogin(s, command)) | |
734 | return; | |
735 | ||
cdd66111 | 736 | display_loginmsg(); |
3c0ef626 | 737 | |
3c0ef626 | 738 | do_motd(); |
739 | } | |
740 | ||
741 | /* | |
742 | * Display the message of the day. | |
743 | */ | |
744 | void | |
745 | do_motd(void) | |
746 | { | |
747 | FILE *f; | |
748 | char buf[256]; | |
749 | ||
750 | if (options.print_motd) { | |
751 | #ifdef HAVE_LOGIN_CAP | |
752 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
753 | "/etc/motd"), "r"); | |
754 | #else | |
755 | f = fopen("/etc/motd", "r"); | |
756 | #endif | |
757 | if (f) { | |
758 | while (fgets(buf, sizeof(buf), f)) | |
759 | fputs(buf, stdout); | |
760 | fclose(f); | |
761 | } | |
762 | } | |
763 | } | |
764 | ||
765 | ||
766 | /* | |
767 | * Check for quiet login, either .hushlogin or command given. | |
768 | */ | |
769 | int | |
770 | check_quietlogin(Session *s, const char *command) | |
771 | { | |
772 | char buf[256]; | |
773 | struct passwd *pw = s->pw; | |
774 | struct stat st; | |
775 | ||
776 | /* Return 1 if .hushlogin exists or a command given. */ | |
777 | if (command != NULL) | |
778 | return 1; | |
779 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
780 | #ifdef HAVE_LOGIN_CAP | |
781 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
782 | return 1; | |
783 | #else | |
784 | if (stat(buf, &st) >= 0) | |
785 | return 1; | |
786 | #endif | |
787 | return 0; | |
788 | } | |
789 | ||
790 | /* | |
791 | * Sets the value of the given variable in the environment. If the variable | |
792 | * already exists, its value is overriden. | |
793 | */ | |
0fff78ff | 794 | void |
3c0ef626 | 795 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
e9a17296 | 796 | const char *value) |
3c0ef626 | 797 | { |
3c0ef626 | 798 | char **env; |
acc3d05e | 799 | u_int envsize; |
800 | u_int i, namelen; | |
3c0ef626 | 801 | |
0fff78ff | 802 | /* |
803 | * If we're passed an uninitialized list, allocate a single null | |
804 | * entry before continuing. | |
805 | */ | |
806 | if (*envp == NULL && *envsizep == 0) { | |
807 | *envp = xmalloc(sizeof(char *)); | |
808 | *envp[0] = NULL; | |
809 | *envsizep = 1; | |
810 | } | |
811 | ||
3c0ef626 | 812 | /* |
813 | * Find the slot where the value should be stored. If the variable | |
814 | * already exists, we reuse the slot; otherwise we append a new slot | |
815 | * at the end of the array, expanding if necessary. | |
816 | */ | |
817 | env = *envp; | |
818 | namelen = strlen(name); | |
819 | for (i = 0; env[i]; i++) | |
820 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
821 | break; | |
822 | if (env[i]) { | |
823 | /* Reuse the slot. */ | |
824 | xfree(env[i]); | |
825 | } else { | |
826 | /* New variable. Expand if necessary. */ | |
acc3d05e | 827 | envsize = *envsizep; |
828 | if (i >= envsize - 1) { | |
829 | if (envsize >= 1000) | |
830 | fatal("child_set_env: too many env vars"); | |
831 | envsize += 50; | |
832 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); | |
833 | *envsizep = envsize; | |
3c0ef626 | 834 | } |
835 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
836 | env[i + 1] = NULL; | |
837 | } | |
838 | ||
839 | /* Allocate space and format the variable in the appropriate slot. */ | |
840 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
841 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
842 | } | |
843 | ||
844 | /* | |
845 | * Reads environment variables from the given file and adds/overrides them | |
846 | * into the environment. If the file does not exist, this does nothing. | |
847 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
848 | * and assignments of the form name=value. No other forms are allowed. | |
849 | */ | |
850 | static void | |
851 | read_environment_file(char ***env, u_int *envsize, | |
e9a17296 | 852 | const char *filename) |
3c0ef626 | 853 | { |
854 | FILE *f; | |
855 | char buf[4096]; | |
856 | char *cp, *value; | |
680cee3b | 857 | u_int lineno = 0; |
3c0ef626 | 858 | |
859 | f = fopen(filename, "r"); | |
860 | if (!f) | |
861 | return; | |
862 | ||
863 | while (fgets(buf, sizeof(buf), f)) { | |
680cee3b | 864 | if (++lineno > 1000) |
865 | fatal("Too many lines in environment file %s", filename); | |
3c0ef626 | 866 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
867 | ; | |
868 | if (!*cp || *cp == '#' || *cp == '\n') | |
869 | continue; | |
870 | if (strchr(cp, '\n')) | |
871 | *strchr(cp, '\n') = '\0'; | |
872 | value = strchr(cp, '='); | |
873 | if (value == NULL) { | |
680cee3b | 874 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
875 | filename); | |
3c0ef626 | 876 | continue; |
877 | } | |
878 | /* | |
879 | * Replace the equals sign by nul, and advance value to | |
880 | * the value string. | |
881 | */ | |
882 | *value = '\0'; | |
883 | value++; | |
884 | child_set_env(env, envsize, cp, value); | |
885 | } | |
886 | fclose(f); | |
887 | } | |
888 | ||
0fff78ff | 889 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
890 | /* | |
891 | * Return named variable from specified environment, or NULL if not present. | |
892 | */ | |
893 | static char * | |
894 | child_get_env(char **env, const char *name) | |
895 | { | |
896 | int i; | |
897 | size_t len; | |
898 | ||
899 | len = strlen(name); | |
900 | for (i=0; env[i] != NULL; i++) | |
901 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
902 | return(env[i] + len + 1); | |
903 | return NULL; | |
904 | } | |
905 | ||
906 | /* | |
907 | * Read /etc/default/login. | |
908 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
909 | */ | |
910 | static void | |
911 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
912 | { | |
913 | char **tmpenv = NULL, *var; | |
acc3d05e | 914 | u_int i, tmpenvsize = 0; |
cdd66111 | 915 | u_long mask; |
0fff78ff | 916 | |
917 | /* | |
918 | * We don't want to copy the whole file to the child's environment, | |
919 | * so we use a temporary environment and copy the variables we're | |
920 | * interested in. | |
921 | */ | |
922 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
923 | ||
acc3d05e | 924 | if (tmpenv == NULL) |
925 | return; | |
926 | ||
0fff78ff | 927 | if (uid == 0) |
928 | var = child_get_env(tmpenv, "SUPATH"); | |
929 | else | |
930 | var = child_get_env(tmpenv, "PATH"); | |
931 | if (var != NULL) | |
932 | child_set_env(env, envsize, "PATH", var); | |
cdd66111 | 933 | |
0fff78ff | 934 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
935 | if (sscanf(var, "%5lo", &mask) == 1) | |
cdd66111 | 936 | umask((mode_t)mask); |
937 | ||
0fff78ff | 938 | for (i = 0; tmpenv[i] != NULL; i++) |
939 | xfree(tmpenv[i]); | |
940 | xfree(tmpenv); | |
941 | } | |
942 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
943 | ||
665a873d | 944 | void |
945 | copy_environment(char **source, char ***env, u_int *envsize) | |
3c0ef626 | 946 | { |
e9a17296 | 947 | char *var_name, *var_val; |
3c0ef626 | 948 | int i; |
949 | ||
e9a17296 | 950 | if (source == NULL) |
3c0ef626 | 951 | return; |
952 | ||
e9a17296 | 953 | for(i = 0; source[i] != NULL; i++) { |
954 | var_name = xstrdup(source[i]); | |
955 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
956 | xfree(var_name); | |
3c0ef626 | 957 | continue; |
3c0ef626 | 958 | } |
e9a17296 | 959 | *var_val++ = '\0'; |
3c0ef626 | 960 | |
e9a17296 | 961 | debug3("Copy environment: %s=%s", var_name, var_val); |
962 | child_set_env(env, envsize, var_name, var_val); | |
cdd66111 | 963 | |
e9a17296 | 964 | xfree(var_name); |
3c0ef626 | 965 | } |
966 | } | |
3c0ef626 | 967 | |
e9a17296 | 968 | static char ** |
969 | do_setup_env(Session *s, const char *shell) | |
3c0ef626 | 970 | { |
3c0ef626 | 971 | char buf[256]; |
e9a17296 | 972 | u_int i, envsize; |
0fff78ff | 973 | char **env, *laddr, *path = NULL; |
e9a17296 | 974 | struct passwd *pw = s->pw; |
3c0ef626 | 975 | |
976 | /* Initialize the environment. */ | |
977 | envsize = 100; | |
978 | env = xmalloc(envsize * sizeof(char *)); | |
979 | env[0] = NULL; | |
980 | ||
981 | #ifdef HAVE_CYGWIN | |
982 | /* | |
983 | * The Windows environment contains some setting which are | |
984 | * important for a running system. They must not be dropped. | |
985 | */ | |
996d5e62 | 986 | { |
987 | char **p; | |
988 | ||
989 | p = fetch_windows_environment(); | |
990 | copy_environment(p, &env, &envsize); | |
991 | free_windows_environment(p); | |
992 | } | |
3c0ef626 | 993 | #endif |
994 | ||
0fff78ff | 995 | #ifdef GSSAPI |
cdd66111 | 996 | /* Allow any GSSAPI methods that we've used to alter |
0fff78ff | 997 | * the childs environment as they see fit |
998 | */ | |
999 | ssh_gssapi_do_child(&env, &envsize); | |
1000 | #endif | |
1001 | ||
3c0ef626 | 1002 | if (!options.use_login) { |
1003 | /* Set basic environment. */ | |
c9f39d2c | 1004 | for (i = 0; i < s->num_env; i++) |
1005 | child_set_env(&env, &envsize, s->env[i].name, | |
1006 | s->env[i].val); | |
1007 | ||
3c0ef626 | 1008 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1009 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
6a9b3198 | 1010 | #ifdef _AIX |
1011 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1012 | #endif | |
3c0ef626 | 1013 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
1014 | #ifdef HAVE_LOGIN_CAP | |
41b2f314 | 1015 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1016 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1017 | else | |
1018 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
3c0ef626 | 1019 | #else /* HAVE_LOGIN_CAP */ |
1020 | # ifndef HAVE_CYGWIN | |
1021 | /* | |
1022 | * There's no standard path on Windows. The path contains | |
1023 | * important components pointing to the system directories, | |
1024 | * needed for loading shared libraries. So the path better | |
1025 | * remains intact here. | |
1026 | */ | |
0fff78ff | 1027 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1028 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1029 | path = child_get_env(env, "PATH"); | |
1030 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1031 | if (path == NULL || *path == '\0') { | |
cdd66111 | 1032 | child_set_env(&env, &envsize, "PATH", |
0fff78ff | 1033 | s->pw->pw_uid == 0 ? |
1034 | SUPERUSER_PATH : _PATH_STDPATH); | |
1035 | } | |
3c0ef626 | 1036 | # endif /* HAVE_CYGWIN */ |
1037 | #endif /* HAVE_LOGIN_CAP */ | |
1038 | ||
1039 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1040 | _PATH_MAILDIR, pw->pw_name); | |
1041 | child_set_env(&env, &envsize, "MAIL", buf); | |
1042 | ||
1043 | /* Normal systems set SHELL by default. */ | |
1044 | child_set_env(&env, &envsize, "SHELL", shell); | |
1045 | } | |
1046 | if (getenv("TZ")) | |
1047 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1048 | ||
1049 | /* Set custom environment options from RSA authentication. */ | |
1050 | if (!options.use_login) { | |
1051 | while (custom_environment) { | |
1052 | struct envstring *ce = custom_environment; | |
41b2f314 | 1053 | char *str = ce->s; |
e9a17296 | 1054 | |
41b2f314 | 1055 | for (i = 0; str[i] != '=' && str[i]; i++) |
3c0ef626 | 1056 | ; |
41b2f314 | 1057 | if (str[i] == '=') { |
1058 | str[i] = 0; | |
1059 | child_set_env(&env, &envsize, str, str + i + 1); | |
3c0ef626 | 1060 | } |
1061 | custom_environment = ce->next; | |
1062 | xfree(ce->s); | |
1063 | xfree(ce); | |
1064 | } | |
1065 | } | |
1066 | ||
41b2f314 | 1067 | /* SSH_CLIENT deprecated */ |
3c0ef626 | 1068 | snprintf(buf, sizeof buf, "%.50s %d %d", |
e9a17296 | 1069 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
3c0ef626 | 1070 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1071 | ||
6a9b3198 | 1072 | laddr = get_local_ipaddr(packet_get_connection_in()); |
41b2f314 | 1073 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
6a9b3198 | 1074 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1075 | xfree(laddr); | |
41b2f314 | 1076 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1077 | ||
3c0ef626 | 1078 | if (s->ttyfd != -1) |
1079 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1080 | if (s->term) | |
1081 | child_set_env(&env, &envsize, "TERM", s->term); | |
1082 | if (s->display) | |
1083 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
1084 | if (original_command) | |
1085 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1086 | original_command); | |
1087 | ||
41b2f314 | 1088 | #ifdef _UNICOS |
1089 | if (cray_tmpdir[0] != '\0') | |
1090 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1091 | #endif /* _UNICOS */ | |
1092 | ||
996d5e62 | 1093 | /* |
1094 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1095 | * must have been set by a native authentication method (eg AIX or | |
1096 | * SIA), so copy it to the child. | |
1097 | */ | |
1098 | { | |
1099 | char *cp; | |
1100 | ||
1101 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1102 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1103 | } | |
1104 | ||
3c0ef626 | 1105 | #ifdef _AIX |
e9a17296 | 1106 | { |
1107 | char *cp; | |
1108 | ||
1109 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1110 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
e9a17296 | 1111 | read_environment_file(&env, &envsize, "/etc/environment"); |
1112 | } | |
3c0ef626 | 1113 | #endif |
3c0ef626 | 1114 | #ifdef KRB5 |
99be0775 | 1115 | if (s->authctxt->krb5_ccname) |
3c0ef626 | 1116 | child_set_env(&env, &envsize, "KRB5CCNAME", |
99be0775 | 1117 | s->authctxt->krb5_ccname); |
3c0ef626 | 1118 | #endif |
1119 | #ifdef USE_PAM | |
41b2f314 | 1120 | /* |
1121 | * Pull in any environment variables that may have | |
1122 | * been set by PAM. | |
1123 | */ | |
0fff78ff | 1124 | if (options.use_pam) { |
cdd66111 | 1125 | char **p; |
41b2f314 | 1126 | |
cdd66111 | 1127 | p = fetch_pam_child_environment(); |
1128 | copy_environment(p, &env, &envsize); | |
1129 | free_pam_environment(p); | |
1130 | ||
1131 | p = fetch_pam_environment(); | |
41b2f314 | 1132 | copy_environment(p, &env, &envsize); |
1133 | free_pam_environment(p); | |
1134 | } | |
3c0ef626 | 1135 | #endif /* USE_PAM */ |
1136 | ||
f5799ae1 | 1137 | if (auth_sock_name != NULL) |
3c0ef626 | 1138 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
f5799ae1 | 1139 | auth_sock_name); |
3c0ef626 | 1140 | |
1141 | /* read $HOME/.ssh/environment. */ | |
41b2f314 | 1142 | if (options.permit_user_env && !options.use_login) { |
3c0ef626 | 1143 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
41b2f314 | 1144 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
3c0ef626 | 1145 | read_environment_file(&env, &envsize, buf); |
1146 | } | |
1147 | if (debug_flag) { | |
1148 | /* dump the environment */ | |
1149 | fprintf(stderr, "Environment:\n"); | |
1150 | for (i = 0; env[i]; i++) | |
1151 | fprintf(stderr, " %.200s\n", env[i]); | |
1152 | } | |
e9a17296 | 1153 | return env; |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1158 | * first in this order). | |
1159 | */ | |
1160 | static void | |
1161 | do_rc_files(Session *s, const char *shell) | |
1162 | { | |
1163 | FILE *f = NULL; | |
1164 | char cmd[1024]; | |
1165 | int do_xauth; | |
1166 | struct stat st; | |
1167 | ||
1168 | do_xauth = | |
1169 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1170 | ||
1171 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1172 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1173 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1174 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1175 | if (debug_flag) | |
1176 | fprintf(stderr, "Running %s\n", cmd); | |
1177 | f = popen(cmd, "w"); | |
1178 | if (f) { | |
1179 | if (do_xauth) | |
1180 | fprintf(f, "%s %s\n", s->auth_proto, | |
1181 | s->auth_data); | |
1182 | pclose(f); | |
1183 | } else | |
1184 | fprintf(stderr, "Could not run %s\n", | |
1185 | _PATH_SSH_USER_RC); | |
1186 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1187 | if (debug_flag) | |
1188 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1189 | _PATH_SSH_SYSTEM_RC); | |
1190 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1191 | if (f) { | |
1192 | if (do_xauth) | |
1193 | fprintf(f, "%s %s\n", s->auth_proto, | |
1194 | s->auth_data); | |
1195 | pclose(f); | |
1196 | } else | |
1197 | fprintf(stderr, "Could not run %s\n", | |
1198 | _PATH_SSH_SYSTEM_RC); | |
1199 | } else if (do_xauth && options.xauth_location != NULL) { | |
1200 | /* Add authority data to .Xauthority if appropriate. */ | |
1201 | if (debug_flag) { | |
1202 | fprintf(stderr, | |
6a9b3198 | 1203 | "Running %.500s remove %.100s\n", |
cdd66111 | 1204 | options.xauth_location, s->auth_display); |
6a9b3198 | 1205 | fprintf(stderr, |
1206 | "%.500s add %.100s %.100s %.100s\n", | |
e9a17296 | 1207 | options.xauth_location, s->auth_display, |
1208 | s->auth_proto, s->auth_data); | |
1209 | } | |
1210 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1211 | options.xauth_location); | |
1212 | f = popen(cmd, "w"); | |
1213 | if (f) { | |
6a9b3198 | 1214 | fprintf(f, "remove %s\n", |
1215 | s->auth_display); | |
e9a17296 | 1216 | fprintf(f, "add %s %s %s\n", |
1217 | s->auth_display, s->auth_proto, | |
1218 | s->auth_data); | |
1219 | pclose(f); | |
1220 | } else { | |
1221 | fprintf(stderr, "Could not run %s\n", | |
1222 | cmd); | |
1223 | } | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | static void | |
1228 | do_nologin(struct passwd *pw) | |
1229 | { | |
1230 | FILE *f = NULL; | |
1231 | char buf[1024]; | |
1232 | ||
1233 | #ifdef HAVE_LOGIN_CAP | |
1234 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1235 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1236 | _PATH_NOLOGIN), "r"); | |
1237 | #else | |
1238 | if (pw->pw_uid) | |
1239 | f = fopen(_PATH_NOLOGIN, "r"); | |
1240 | #endif | |
1241 | if (f) { | |
1242 | /* /etc/nologin exists. Print its contents and exit. */ | |
0fff78ff | 1243 | logit("User %.100s not allowed because %s exists", |
41b2f314 | 1244 | pw->pw_name, _PATH_NOLOGIN); |
e9a17296 | 1245 | while (fgets(buf, sizeof(buf), f)) |
1246 | fputs(buf, stderr); | |
1247 | fclose(f); | |
6a9b3198 | 1248 | fflush(NULL); |
e9a17296 | 1249 | exit(254); |
1250 | } | |
1251 | } | |
1252 | ||
1253 | /* Set login name, uid, gid, and groups. */ | |
700318f3 | 1254 | void |
e9a17296 | 1255 | do_setusercontext(struct passwd *pw) |
1256 | { | |
6a9b3198 | 1257 | #ifndef HAVE_CYGWIN |
1258 | if (getuid() == 0 || geteuid() == 0) | |
e9a17296 | 1259 | #endif /* HAVE_CYGWIN */ |
6a9b3198 | 1260 | { |
1261 | ||
f5799ae1 | 1262 | #ifdef HAVE_SETPCRED |
0fff78ff | 1263 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1264 | fatal("Failed to set process credentials"); | |
f5799ae1 | 1265 | #endif /* HAVE_SETPCRED */ |
e9a17296 | 1266 | #ifdef HAVE_LOGIN_CAP |
41b2f314 | 1267 | # ifdef __bsdi__ |
680cee3b | 1268 | setpgid(0, 0); |
41b2f314 | 1269 | # endif |
996d5e62 | 1270 | #ifdef GSSAPI |
1271 | if (options.gss_authentication) { | |
1272 | temporarily_use_uid(pw); | |
1273 | ssh_gssapi_storecreds(); | |
1274 | restore_uid(); | |
1275 | } | |
1276 | #endif | |
cdd66111 | 1277 | # ifdef USE_PAM |
1278 | if (options.use_pam) { | |
1279 | do_pam_session(); | |
1280 | do_pam_setcred(0); | |
1281 | } | |
1282 | # endif /* USE_PAM */ | |
e9a17296 | 1283 | if (setusercontext(lc, pw, pw->pw_uid, |
1284 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1285 | perror("unable to set user context"); | |
1286 | exit(1); | |
1287 | } | |
1288 | #else | |
1289 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1290 | /* Sets login uid for accounting */ | |
1291 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1292 | error("setluid: %s", strerror(errno)); | |
1293 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1294 | ||
1295 | if (setlogin(pw->pw_name) < 0) | |
1296 | error("setlogin failed: %s", strerror(errno)); | |
1297 | if (setgid(pw->pw_gid) < 0) { | |
1298 | perror("setgid"); | |
1299 | exit(1); | |
1300 | } | |
1301 | /* Initialize the group list. */ | |
1302 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1303 | perror("initgroups"); | |
1304 | exit(1); | |
1305 | } | |
1306 | endgrent(); | |
996d5e62 | 1307 | #ifdef GSSAPI |
1308 | if (options.gss_authentication) { | |
1309 | temporarily_use_uid(pw); | |
1310 | ssh_gssapi_storecreds(); | |
1311 | restore_uid(); | |
1312 | } | |
1313 | #endif | |
e9a17296 | 1314 | # ifdef USE_PAM |
1315 | /* | |
cdd66111 | 1316 | * PAM credentials may take the form of supplementary groups. |
e9a17296 | 1317 | * These will have been wiped by the above initgroups() call. |
1318 | * Reestablish them here. | |
1319 | */ | |
0fff78ff | 1320 | if (options.use_pam) { |
1321 | do_pam_session(); | |
1322 | do_pam_setcred(0); | |
1323 | } | |
e9a17296 | 1324 | # endif /* USE_PAM */ |
1325 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1326 | irix_setusercontext(pw); | |
1327 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
680cee3b | 1328 | # ifdef _AIX |
41b2f314 | 1329 | aix_usrinfo(pw); |
680cee3b | 1330 | # endif /* _AIX */ |
665a873d | 1331 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
1332 | if (set_id(pw->pw_name) != 0) { | |
1333 | exit(1); | |
1334 | } | |
1335 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ | |
e9a17296 | 1336 | /* Permanently switch to the desired uid. */ |
1337 | permanently_set_uid(pw); | |
1338 | #endif | |
1339 | } | |
6a9b3198 | 1340 | |
1341 | #ifdef HAVE_CYGWIN | |
1342 | if (is_winnt) | |
1343 | #endif | |
e9a17296 | 1344 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1345 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1346 | } | |
1347 | ||
cdd66111 | 1348 | static void |
1349 | do_pwchange(Session *s) | |
1350 | { | |
c9f39d2c | 1351 | fflush(NULL); |
cdd66111 | 1352 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1353 | if (s->ttyfd != -1) { | |
c9f39d2c | 1354 | fprintf(stderr, |
cdd66111 | 1355 | "You must change your password now and login again!\n"); |
996d5e62 | 1356 | #ifdef PASSWD_NEEDS_USERNAME |
1357 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1358 | (char *)NULL); | |
1359 | #else | |
cdd66111 | 1360 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
996d5e62 | 1361 | #endif |
cdd66111 | 1362 | perror("passwd"); |
1363 | } else { | |
1364 | fprintf(stderr, | |
1365 | "Password change required but no TTY available.\n"); | |
1366 | } | |
1367 | exit(1); | |
1368 | } | |
1369 | ||
700318f3 | 1370 | static void |
1371 | launch_login(struct passwd *pw, const char *hostname) | |
1372 | { | |
1373 | /* Launch login(1). */ | |
1374 | ||
f5799ae1 | 1375 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
700318f3 | 1376 | #ifdef xxxLOGIN_NEEDS_TERM |
f5799ae1 | 1377 | (s->term ? s->term : "unknown"), |
700318f3 | 1378 | #endif /* LOGIN_NEEDS_TERM */ |
1379 | #ifdef LOGIN_NO_ENDOPT | |
1380 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1381 | #else | |
1382 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1383 | #endif | |
1384 | ||
1385 | /* Login couldn't be executed, die. */ | |
1386 | ||
1387 | perror("login"); | |
1388 | exit(1); | |
1389 | } | |
1390 | ||
cdd66111 | 1391 | static void |
1392 | child_close_fds(void) | |
1393 | { | |
1394 | int i; | |
1395 | ||
1396 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1397 | close(packet_get_connection_in()); | |
1398 | else { | |
1399 | close(packet_get_connection_in()); | |
1400 | close(packet_get_connection_out()); | |
1401 | } | |
1402 | /* | |
1403 | * Close all descriptors related to channels. They will still remain | |
1404 | * open in the parent. | |
1405 | */ | |
1406 | /* XXX better use close-on-exec? -markus */ | |
1407 | channel_close_all(); | |
1408 | ||
1409 | /* | |
1410 | * Close any extra file descriptors. Note that there may still be | |
1411 | * descriptors left by system functions. They will be closed later. | |
1412 | */ | |
1413 | endpwent(); | |
1414 | ||
1415 | /* | |
2c06c99b | 1416 | * Close any extra open file descriptors so that we don't have them |
cdd66111 | 1417 | * hanging around in clients. Note that we want to do this after |
1418 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1419 | * descriptors open. | |
1420 | */ | |
1421 | for (i = 3; i < 64; i++) | |
1422 | close(i); | |
1423 | } | |
1424 | ||
e9a17296 | 1425 | /* |
1426 | * Performs common processing for the child, such as setting up the | |
1427 | * environment, closing extra file descriptors, setting the user and group | |
1428 | * ids, and executing the command or shell. | |
1429 | */ | |
1430 | void | |
1431 | do_child(Session *s, const char *command) | |
1432 | { | |
1433 | extern char **environ; | |
1434 | char **env; | |
1435 | char *argv[10]; | |
1436 | const char *shell, *shell0, *hostname = NULL; | |
1437 | struct passwd *pw = s->pw; | |
e9a17296 | 1438 | |
1439 | /* remove hostkey from the child's memory */ | |
1440 | destroy_sensitive_data(); | |
1441 | ||
cdd66111 | 1442 | /* Force a password change */ |
1443 | if (s->authctxt->force_pwchange) { | |
1444 | do_setusercontext(pw); | |
1445 | child_close_fds(); | |
1446 | do_pwchange(s); | |
1447 | exit(1); | |
1448 | } | |
1449 | ||
e9a17296 | 1450 | /* login(1) is only called if we execute the login shell */ |
1451 | if (options.use_login && command != NULL) | |
1452 | options.use_login = 0; | |
1453 | ||
41b2f314 | 1454 | #ifdef _UNICOS |
1455 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1456 | #endif /* _UNICOS */ | |
1457 | ||
e9a17296 | 1458 | /* |
1459 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1460 | * switch, so we let login(1) to this for us. | |
1461 | */ | |
1462 | if (!options.use_login) { | |
1463 | #ifdef HAVE_OSF_SIA | |
6a9b3198 | 1464 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
e9a17296 | 1465 | if (!check_quietlogin(s, command)) |
1466 | do_motd(); | |
1467 | #else /* HAVE_OSF_SIA */ | |
2c06c99b | 1468 | /* When PAM is enabled we rely on it to do the nologin check */ |
1469 | if (!options.use_pam) | |
1470 | do_nologin(pw); | |
e9a17296 | 1471 | do_setusercontext(pw); |
c9f39d2c | 1472 | /* |
1473 | * PAM session modules in do_setusercontext may have | |
1474 | * generated messages, so if this in an interactive | |
1475 | * login then display them too. | |
1476 | */ | |
996d5e62 | 1477 | if (!check_quietlogin(s, command)) |
c9f39d2c | 1478 | display_loginmsg(); |
e9a17296 | 1479 | #endif /* HAVE_OSF_SIA */ |
1480 | } | |
1481 | ||
996d5e62 | 1482 | #ifdef USE_PAM |
dec6d9fe | 1483 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1484 | debug3("PAM session not opened, exiting"); | |
996d5e62 | 1485 | display_loginmsg(); |
1486 | exit(254); | |
1487 | } | |
1488 | #endif | |
1489 | ||
e9a17296 | 1490 | /* |
1491 | * Get the shell from the password data. An empty shell field is | |
1492 | * legal, and means /bin/sh. | |
1493 | */ | |
1494 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
6a9b3198 | 1495 | |
1496 | /* | |
1497 | * Make sure $SHELL points to the shell from the password file, | |
1498 | * even if shell is overridden from login.conf | |
1499 | */ | |
1500 | env = do_setup_env(s, shell); | |
1501 | ||
e9a17296 | 1502 | #ifdef HAVE_LOGIN_CAP |
1503 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1504 | #endif | |
1505 | ||
3c0ef626 | 1506 | /* we have to stash the hostname before we close our socket. */ |
1507 | if (options.use_login) | |
1508 | hostname = get_remote_name_or_ip(utmp_len, | |
0fff78ff | 1509 | options.use_dns); |
3c0ef626 | 1510 | /* |
1511 | * Close the connection descriptors; note that this is the child, and | |
1512 | * the server will still have the socket open, and it is important | |
1513 | * that we do not shutdown it. Note that the descriptors cannot be | |
1514 | * closed before building the environment, as we call | |
1515 | * get_remote_ipaddr there. | |
1516 | */ | |
cdd66111 | 1517 | child_close_fds(); |
3c0ef626 | 1518 | |
1519 | /* | |
cdd66111 | 1520 | * Must take new environment into use so that .ssh/rc, |
1521 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
3c0ef626 | 1522 | */ |
cdd66111 | 1523 | environ = env; |
3c0ef626 | 1524 | |
cdd66111 | 1525 | #if defined(KRB5) && defined(USE_AFS) |
3c0ef626 | 1526 | /* |
cdd66111 | 1527 | * At this point, we check to see if AFS is active and if we have |
1528 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1529 | * if we can (and need to) extend the ticket into an AFS token. If | |
1530 | * we don't do this, we run into potential problems if the user's | |
1531 | * home directory is in AFS and it's not world-readable. | |
3c0ef626 | 1532 | */ |
3c0ef626 | 1533 | |
cdd66111 | 1534 | if (options.kerberos_get_afs_token && k_hasafs() && |
665a873d | 1535 | (s->authctxt->krb5_ctx != NULL)) { |
cdd66111 | 1536 | char cell[64]; |
1537 | ||
1538 | debug("Getting AFS token"); | |
1539 | ||
1540 | k_setpag(); | |
1541 | ||
1542 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1543 | krb5_afslog(s->authctxt->krb5_ctx, | |
1544 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1545 | ||
1546 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1547 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1548 | } | |
1549 | #endif | |
3c0ef626 | 1550 | |
2c06c99b | 1551 | /* Change current directory to the user's home directory. */ |
3c0ef626 | 1552 | if (chdir(pw->pw_dir) < 0) { |
1553 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1554 | pw->pw_dir, strerror(errno)); | |
1555 | #ifdef HAVE_LOGIN_CAP | |
1556 | if (login_getcapbool(lc, "requirehome", 0)) | |
1557 | exit(1); | |
1558 | #endif | |
1559 | } | |
1560 | ||
e9a17296 | 1561 | if (!options.use_login) |
1562 | do_rc_files(s, shell); | |
3c0ef626 | 1563 | |
1564 | /* restore SIGPIPE for child */ | |
1565 | signal(SIGPIPE, SIG_DFL); | |
1566 | ||
e9a17296 | 1567 | if (options.use_login) { |
700318f3 | 1568 | launch_login(pw, hostname); |
1569 | /* NEVERREACHED */ | |
e9a17296 | 1570 | } |
1571 | ||
1572 | /* Get the last component of the shell name. */ | |
1573 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1574 | shell0++; | |
1575 | else | |
1576 | shell0 = shell; | |
1577 | ||
3c0ef626 | 1578 | /* |
1579 | * If we have no command, execute the shell. In this case, the shell | |
1580 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1581 | * this is a login shell. | |
1582 | */ | |
1583 | if (!command) { | |
e9a17296 | 1584 | char argv0[256]; |
3c0ef626 | 1585 | |
e9a17296 | 1586 | /* Start the shell. Set initial character to '-'. */ |
1587 | argv0[0] = '-'; | |
3c0ef626 | 1588 | |
e9a17296 | 1589 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1590 | >= sizeof(argv0) - 1) { | |
1591 | errno = EINVAL; | |
3c0ef626 | 1592 | perror(shell); |
1593 | exit(1); | |
e9a17296 | 1594 | } |
3c0ef626 | 1595 | |
e9a17296 | 1596 | /* Execute the shell. */ |
1597 | argv[0] = argv0; | |
1598 | argv[1] = NULL; | |
1599 | execve(shell, argv, env); | |
3c0ef626 | 1600 | |
e9a17296 | 1601 | /* Executing the shell failed. */ |
1602 | perror(shell); | |
1603 | exit(1); | |
3c0ef626 | 1604 | } |
1605 | /* | |
1606 | * Execute the command using the user's shell. This uses the -c | |
1607 | * option to execute the command. | |
1608 | */ | |
e9a17296 | 1609 | argv[0] = (char *) shell0; |
3c0ef626 | 1610 | argv[1] = "-c"; |
1611 | argv[2] = (char *) command; | |
1612 | argv[3] = NULL; | |
1613 | execve(shell, argv, env); | |
1614 | perror(shell); | |
1615 | exit(1); | |
1616 | } | |
1617 | ||
1618 | Session * | |
1619 | session_new(void) | |
1620 | { | |
1621 | int i; | |
1622 | static int did_init = 0; | |
1623 | if (!did_init) { | |
1624 | debug("session_new: init"); | |
e9a17296 | 1625 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1626 | sessions[i].used = 0; |
1627 | } | |
1628 | did_init = 1; | |
1629 | } | |
e9a17296 | 1630 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1631 | Session *s = &sessions[i]; |
1632 | if (! s->used) { | |
1633 | memset(s, 0, sizeof(*s)); | |
1634 | s->chanid = -1; | |
1635 | s->ptyfd = -1; | |
1636 | s->ttyfd = -1; | |
1637 | s->used = 1; | |
1638 | s->self = i; | |
665a873d | 1639 | s->x11_chanids = NULL; |
3c0ef626 | 1640 | debug("session_new: session %d", i); |
1641 | return s; | |
1642 | } | |
1643 | } | |
1644 | return NULL; | |
1645 | } | |
1646 | ||
1647 | static void | |
1648 | session_dump(void) | |
1649 | { | |
1650 | int i; | |
e9a17296 | 1651 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1652 | Session *s = &sessions[i]; |
f5799ae1 | 1653 | debug("dump: used %d session %d %p channel %d pid %ld", |
3c0ef626 | 1654 | s->used, |
1655 | s->self, | |
1656 | s, | |
1657 | s->chanid, | |
f5799ae1 | 1658 | (long)s->pid); |
3c0ef626 | 1659 | } |
1660 | } | |
1661 | ||
1662 | int | |
1663 | session_open(Authctxt *authctxt, int chanid) | |
1664 | { | |
1665 | Session *s = session_new(); | |
1666 | debug("session_open: channel %d", chanid); | |
1667 | if (s == NULL) { | |
1668 | error("no more sessions"); | |
1669 | return 0; | |
1670 | } | |
1671 | s->authctxt = authctxt; | |
1672 | s->pw = authctxt->pw; | |
cdd66111 | 1673 | if (s->pw == NULL || !authctxt->valid) |
3c0ef626 | 1674 | fatal("no user for session %d", s->self); |
1675 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1676 | s->chanid = chanid; | |
1677 | return 1; | |
1678 | } | |
1679 | ||
700318f3 | 1680 | Session * |
1681 | session_by_tty(char *tty) | |
1682 | { | |
1683 | int i; | |
1684 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1685 | Session *s = &sessions[i]; | |
1686 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1687 | debug("session_by_tty: session %d tty %s", i, tty); | |
1688 | return s; | |
1689 | } | |
1690 | } | |
1691 | debug("session_by_tty: unknown tty %.100s", tty); | |
1692 | session_dump(); | |
1693 | return NULL; | |
1694 | } | |
1695 | ||
3c0ef626 | 1696 | static Session * |
1697 | session_by_channel(int id) | |
1698 | { | |
1699 | int i; | |
e9a17296 | 1700 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1701 | Session *s = &sessions[i]; |
1702 | if (s->used && s->chanid == id) { | |
1703 | debug("session_by_channel: session %d channel %d", i, id); | |
1704 | return s; | |
1705 | } | |
1706 | } | |
1707 | debug("session_by_channel: unknown channel %d", id); | |
1708 | session_dump(); | |
1709 | return NULL; | |
1710 | } | |
1711 | ||
665a873d | 1712 | static Session * |
1713 | session_by_x11_channel(int id) | |
1714 | { | |
1715 | int i, j; | |
1716 | ||
1717 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1718 | Session *s = &sessions[i]; | |
1719 | ||
1720 | if (s->x11_chanids == NULL || !s->used) | |
1721 | continue; | |
1722 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
1723 | if (s->x11_chanids[j] == id) { | |
1724 | debug("session_by_x11_channel: session %d " | |
1725 | "channel %d", s->self, id); | |
1726 | return s; | |
1727 | } | |
1728 | } | |
1729 | } | |
1730 | debug("session_by_x11_channel: unknown channel %d", id); | |
1731 | session_dump(); | |
1732 | return NULL; | |
1733 | } | |
1734 | ||
3c0ef626 | 1735 | static Session * |
1736 | session_by_pid(pid_t pid) | |
1737 | { | |
1738 | int i; | |
f5799ae1 | 1739 | debug("session_by_pid: pid %ld", (long)pid); |
e9a17296 | 1740 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1741 | Session *s = &sessions[i]; |
1742 | if (s->used && s->pid == pid) | |
1743 | return s; | |
1744 | } | |
f5799ae1 | 1745 | error("session_by_pid: unknown pid %ld", (long)pid); |
3c0ef626 | 1746 | session_dump(); |
1747 | return NULL; | |
1748 | } | |
1749 | ||
1750 | static int | |
1751 | session_window_change_req(Session *s) | |
1752 | { | |
1753 | s->col = packet_get_int(); | |
1754 | s->row = packet_get_int(); | |
1755 | s->xpixel = packet_get_int(); | |
1756 | s->ypixel = packet_get_int(); | |
e9a17296 | 1757 | packet_check_eom(); |
3c0ef626 | 1758 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1759 | return 1; | |
1760 | } | |
1761 | ||
1762 | static int | |
1763 | session_pty_req(Session *s) | |
1764 | { | |
1765 | u_int len; | |
1766 | int n_bytes; | |
1767 | ||
1768 | if (no_pty_flag) { | |
1769 | debug("Allocating a pty not permitted for this authentication."); | |
1770 | return 0; | |
1771 | } | |
1772 | if (s->ttyfd != -1) { | |
1773 | packet_disconnect("Protocol error: you already have a pty."); | |
1774 | return 0; | |
1775 | } | |
1776 | ||
1777 | s->term = packet_get_string(&len); | |
1778 | ||
1779 | if (compat20) { | |
1780 | s->col = packet_get_int(); | |
1781 | s->row = packet_get_int(); | |
1782 | } else { | |
1783 | s->row = packet_get_int(); | |
1784 | s->col = packet_get_int(); | |
1785 | } | |
1786 | s->xpixel = packet_get_int(); | |
1787 | s->ypixel = packet_get_int(); | |
1788 | ||
1789 | if (strcmp(s->term, "") == 0) { | |
1790 | xfree(s->term); | |
1791 | s->term = NULL; | |
1792 | } | |
1793 | ||
1794 | /* Allocate a pty and open it. */ | |
1795 | debug("Allocating pty."); | |
700318f3 | 1796 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
3c0ef626 | 1797 | if (s->term) |
1798 | xfree(s->term); | |
1799 | s->term = NULL; | |
1800 | s->ptyfd = -1; | |
1801 | s->ttyfd = -1; | |
1802 | error("session_pty_req: session %d alloc failed", s->self); | |
1803 | return 0; | |
1804 | } | |
1805 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1806 | ||
1807 | /* for SSH1 the tty modes length is not given */ | |
1808 | if (!compat20) | |
1809 | n_bytes = packet_remaining(); | |
1810 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1811 | ||
700318f3 | 1812 | if (!use_privsep) |
1813 | pty_setowner(s->pw, s->tty); | |
3c0ef626 | 1814 | |
1815 | /* Set window size from the packet. */ | |
1816 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1817 | ||
e9a17296 | 1818 | packet_check_eom(); |
3c0ef626 | 1819 | session_proctitle(s); |
1820 | return 1; | |
1821 | } | |
1822 | ||
1823 | static int | |
1824 | session_subsystem_req(Session *s) | |
1825 | { | |
1826 | struct stat st; | |
1827 | u_int len; | |
1828 | int success = 0; | |
1829 | char *cmd, *subsys = packet_get_string(&len); | |
665a873d | 1830 | u_int i; |
3c0ef626 | 1831 | |
e9a17296 | 1832 | packet_check_eom(); |
0fff78ff | 1833 | logit("subsystem request for %.100s", subsys); |
3c0ef626 | 1834 | |
1835 | for (i = 0; i < options.num_subsystems; i++) { | |
1836 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1837 | cmd = options.subsystem_command[i]; | |
1838 | if (stat(cmd, &st) < 0) { | |
1839 | error("subsystem: cannot stat %s: %s", cmd, | |
1840 | strerror(errno)); | |
1841 | break; | |
1842 | } | |
1843 | debug("subsystem: exec() %s", cmd); | |
1844 | s->is_subsystem = 1; | |
1845 | do_exec(s, cmd); | |
1846 | success = 1; | |
e9a17296 | 1847 | break; |
3c0ef626 | 1848 | } |
1849 | } | |
1850 | ||
1851 | if (!success) | |
0fff78ff | 1852 | logit("subsystem request for %.100s failed, subsystem not found", |
3c0ef626 | 1853 | subsys); |
1854 | ||
1855 | xfree(subsys); | |
1856 | return success; | |
1857 | } | |
1858 | ||
1859 | static int | |
1860 | session_x11_req(Session *s) | |
1861 | { | |
1862 | int success; | |
1863 | ||
665a873d | 1864 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
1865 | error("session_x11_req: session %d: " | |
2c06c99b | 1866 | "x11 forwarding already active", s->self); |
665a873d | 1867 | return 0; |
1868 | } | |
3c0ef626 | 1869 | s->single_connection = packet_get_char(); |
1870 | s->auth_proto = packet_get_string(NULL); | |
1871 | s->auth_data = packet_get_string(NULL); | |
1872 | s->screen = packet_get_int(); | |
e9a17296 | 1873 | packet_check_eom(); |
3c0ef626 | 1874 | |
1875 | success = session_setup_x11fwd(s); | |
1876 | if (!success) { | |
1877 | xfree(s->auth_proto); | |
1878 | xfree(s->auth_data); | |
1879 | s->auth_proto = NULL; | |
1880 | s->auth_data = NULL; | |
1881 | } | |
1882 | return success; | |
1883 | } | |
1884 | ||
1885 | static int | |
1886 | session_shell_req(Session *s) | |
1887 | { | |
e9a17296 | 1888 | packet_check_eom(); |
3c0ef626 | 1889 | do_exec(s, NULL); |
1890 | return 1; | |
1891 | } | |
1892 | ||
1893 | static int | |
1894 | session_exec_req(Session *s) | |
1895 | { | |
1896 | u_int len; | |
1897 | char *command = packet_get_string(&len); | |
e9a17296 | 1898 | packet_check_eom(); |
3c0ef626 | 1899 | do_exec(s, command); |
1900 | xfree(command); | |
1901 | return 1; | |
1902 | } | |
1903 | ||
0fff78ff | 1904 | static int |
1905 | session_break_req(Session *s) | |
1906 | { | |
0fff78ff | 1907 | |
c9f39d2c | 1908 | packet_get_int(); /* ignored */ |
0fff78ff | 1909 | packet_check_eom(); |
1910 | ||
1911 | if (s->ttyfd == -1 || | |
1912 | tcsendbreak(s->ttyfd, 0) < 0) | |
1913 | return 0; | |
1914 | return 1; | |
1915 | } | |
1916 | ||
c9f39d2c | 1917 | static int |
1918 | session_env_req(Session *s) | |
1919 | { | |
1920 | char *name, *val; | |
1921 | u_int name_len, val_len, i; | |
1922 | ||
1923 | name = packet_get_string(&name_len); | |
1924 | val = packet_get_string(&val_len); | |
1925 | packet_check_eom(); | |
1926 | ||
1927 | /* Don't set too many environment variables */ | |
1928 | if (s->num_env > 128) { | |
1929 | debug2("Ignoring env request %s: too many env vars", name); | |
1930 | goto fail; | |
1931 | } | |
1932 | ||
1933 | for (i = 0; i < options.num_accept_env; i++) { | |
1934 | if (match_pattern(name, options.accept_env[i])) { | |
1935 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
1936 | s->env = xrealloc(s->env, sizeof(*s->env) * | |
1937 | (s->num_env + 1)); | |
1938 | s->env[s->num_env].name = name; | |
1939 | s->env[s->num_env].val = val; | |
1940 | s->num_env++; | |
1941 | return (1); | |
1942 | } | |
1943 | } | |
1944 | debug2("Ignoring env request %s: disallowed name", name); | |
1945 | ||
1946 | fail: | |
1947 | xfree(name); | |
1948 | xfree(val); | |
1949 | return (0); | |
1950 | } | |
1951 | ||
3c0ef626 | 1952 | static int |
1953 | session_auth_agent_req(Session *s) | |
1954 | { | |
1955 | static int called = 0; | |
e9a17296 | 1956 | packet_check_eom(); |
3c0ef626 | 1957 | if (no_agent_forwarding_flag) { |
1958 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1959 | return 0; | |
1960 | } | |
1961 | if (called) { | |
1962 | return 0; | |
1963 | } else { | |
1964 | called = 1; | |
1965 | return auth_input_request_forwarding(s->pw); | |
1966 | } | |
1967 | } | |
1968 | ||
e9a17296 | 1969 | int |
1970 | session_input_channel_req(Channel *c, const char *rtype) | |
3c0ef626 | 1971 | { |
3c0ef626 | 1972 | int success = 0; |
3c0ef626 | 1973 | Session *s; |
3c0ef626 | 1974 | |
e9a17296 | 1975 | if ((s = session_by_channel(c->self)) == NULL) { |
0fff78ff | 1976 | logit("session_input_channel_req: no session %d req %.100s", |
e9a17296 | 1977 | c->self, rtype); |
1978 | return 0; | |
1979 | } | |
1980 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
3c0ef626 | 1981 | |
1982 | /* | |
1983 | * a session is in LARVAL state until a shell, a command | |
1984 | * or a subsystem is executed | |
1985 | */ | |
1986 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1987 | if (strcmp(rtype, "shell") == 0) { | |
1988 | success = session_shell_req(s); | |
1989 | } else if (strcmp(rtype, "exec") == 0) { | |
1990 | success = session_exec_req(s); | |
1991 | } else if (strcmp(rtype, "pty-req") == 0) { | |
1992 | success = session_pty_req(s); | |
1993 | } else if (strcmp(rtype, "x11-req") == 0) { | |
1994 | success = session_x11_req(s); | |
1995 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { | |
1996 | success = session_auth_agent_req(s); | |
1997 | } else if (strcmp(rtype, "subsystem") == 0) { | |
1998 | success = session_subsystem_req(s); | |
c9f39d2c | 1999 | } else if (strcmp(rtype, "env") == 0) { |
2000 | success = session_env_req(s); | |
3c0ef626 | 2001 | } |
2002 | } | |
2003 | if (strcmp(rtype, "window-change") == 0) { | |
2004 | success = session_window_change_req(s); | |
c9f39d2c | 2005 | } else if (strcmp(rtype, "break") == 0) { |
2006 | success = session_break_req(s); | |
3c0ef626 | 2007 | } |
c9f39d2c | 2008 | |
e9a17296 | 2009 | return success; |
3c0ef626 | 2010 | } |
2011 | ||
2012 | void | |
2013 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2014 | { | |
2015 | if (!compat20) | |
2016 | fatal("session_set_fds: called for proto != 2.0"); | |
2017 | /* | |
2018 | * now that have a child and a pipe to the child, | |
2019 | * we can activate our channel and register the fd's | |
2020 | */ | |
2021 | if (s->chanid == -1) | |
2022 | fatal("no channel for session %d", s->self); | |
d4e9cd2c | 2023 | if(options.hpn_disabled) |
2024 | channel_set_fds(s->chanid, | |
2025 | fdout, fdin, fderr, | |
2026 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
2027 | 1, | |
2028 | CHAN_SES_WINDOW_DEFAULT); | |
2029 | else | |
2030 | channel_set_fds(s->chanid, | |
2031 | fdout, fdin, fderr, | |
2032 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
2033 | 1, | |
2034 | options.hpn_buffer_size); | |
3c0ef626 | 2035 | } |
2036 | ||
2037 | /* | |
2038 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2039 | * (e.g., due to a dropped connection). | |
2040 | */ | |
700318f3 | 2041 | void |
cdd66111 | 2042 | session_pty_cleanup2(Session *s) |
3c0ef626 | 2043 | { |
3c0ef626 | 2044 | if (s == NULL) { |
2045 | error("session_pty_cleanup: no session"); | |
2046 | return; | |
2047 | } | |
2048 | if (s->ttyfd == -1) | |
2049 | return; | |
2050 | ||
2051 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); | |
2052 | ||
2053 | /* Record that the user has logged out. */ | |
2054 | if (s->pid != 0) | |
e9a17296 | 2055 | record_logout(s->pid, s->tty, s->pw->pw_name); |
3c0ef626 | 2056 | |
2057 | /* Release the pseudo-tty. */ | |
700318f3 | 2058 | if (getuid() == 0) |
2059 | pty_release(s->tty); | |
3c0ef626 | 2060 | |
2061 | /* | |
2062 | * Close the server side of the socket pairs. We must do this after | |
2063 | * the pty cleanup, so that another process doesn't get this pty | |
2064 | * while we're still cleaning up. | |
2065 | */ | |
2066 | if (close(s->ptymaster) < 0) | |
700318f3 | 2067 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
3c0ef626 | 2068 | |
2069 | /* unlink pty from session */ | |
2070 | s->ttyfd = -1; | |
2071 | } | |
2072 | ||
700318f3 | 2073 | void |
cdd66111 | 2074 | session_pty_cleanup(Session *s) |
700318f3 | 2075 | { |
cdd66111 | 2076 | PRIVSEP(session_pty_cleanup2(s)); |
700318f3 | 2077 | } |
2078 | ||
41b2f314 | 2079 | static char * |
2080 | sig2name(int sig) | |
2081 | { | |
2082 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2083 | SSH_SIG(ABRT); | |
2084 | SSH_SIG(ALRM); | |
2085 | SSH_SIG(FPE); | |
2086 | SSH_SIG(HUP); | |
2087 | SSH_SIG(ILL); | |
2088 | SSH_SIG(INT); | |
2089 | SSH_SIG(KILL); | |
2090 | SSH_SIG(PIPE); | |
2091 | SSH_SIG(QUIT); | |
2092 | SSH_SIG(SEGV); | |
2093 | SSH_SIG(TERM); | |
2094 | SSH_SIG(USR1); | |
2095 | SSH_SIG(USR2); | |
2096 | #undef SSH_SIG | |
2097 | return "SIG@openssh.com"; | |
2098 | } | |
2099 | ||
665a873d | 2100 | static void |
2101 | session_close_x11(int id) | |
2102 | { | |
2103 | Channel *c; | |
2104 | ||
2c06c99b | 2105 | if ((c = channel_by_id(id)) == NULL) { |
665a873d | 2106 | debug("session_close_x11: x11 channel %d missing", id); |
2107 | } else { | |
2108 | /* Detach X11 listener */ | |
2109 | debug("session_close_x11: detach x11 channel %d", id); | |
2110 | channel_cancel_cleanup(id); | |
2111 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2112 | chan_mark_dead(c); | |
2113 | } | |
2114 | } | |
2115 | ||
2116 | static void | |
2117 | session_close_single_x11(int id, void *arg) | |
2118 | { | |
2119 | Session *s; | |
2120 | u_int i; | |
2121 | ||
2122 | debug3("session_close_single_x11: channel %d", id); | |
2123 | channel_cancel_cleanup(id); | |
2124 | if ((s = session_by_x11_channel(id)) == NULL) | |
2125 | fatal("session_close_single_x11: no x11 channel %d", id); | |
2126 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2127 | debug("session_close_single_x11: session %d: " | |
2128 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2129 | /* | |
2130 | * The channel "id" is already closing, but make sure we | |
2131 | * close all of its siblings. | |
2132 | */ | |
2133 | if (s->x11_chanids[i] != id) | |
2134 | session_close_x11(s->x11_chanids[i]); | |
2135 | } | |
2136 | xfree(s->x11_chanids); | |
2137 | s->x11_chanids = NULL; | |
2138 | if (s->display) { | |
2139 | xfree(s->display); | |
2140 | s->display = NULL; | |
2141 | } | |
2142 | if (s->auth_proto) { | |
2143 | xfree(s->auth_proto); | |
2144 | s->auth_proto = NULL; | |
2145 | } | |
2146 | if (s->auth_data) { | |
2147 | xfree(s->auth_data); | |
2148 | s->auth_data = NULL; | |
2149 | } | |
2150 | if (s->auth_display) { | |
2151 | xfree(s->auth_display); | |
2152 | s->auth_display = NULL; | |
2153 | } | |
2154 | } | |
2155 | ||
3c0ef626 | 2156 | static void |
2157 | session_exit_message(Session *s, int status) | |
2158 | { | |
2159 | Channel *c; | |
e9a17296 | 2160 | |
2161 | if ((c = channel_lookup(s->chanid)) == NULL) | |
3c0ef626 | 2162 | fatal("session_exit_message: session %d: no channel %d", |
2163 | s->self, s->chanid); | |
f5799ae1 | 2164 | debug("session_exit_message: session %d channel %d pid %ld", |
2165 | s->self, s->chanid, (long)s->pid); | |
3c0ef626 | 2166 | |
2167 | if (WIFEXITED(status)) { | |
e9a17296 | 2168 | channel_request_start(s->chanid, "exit-status", 0); |
3c0ef626 | 2169 | packet_put_int(WEXITSTATUS(status)); |
2170 | packet_send(); | |
2171 | } else if (WIFSIGNALED(status)) { | |
e9a17296 | 2172 | channel_request_start(s->chanid, "exit-signal", 0); |
41b2f314 | 2173 | packet_put_cstring(sig2name(WTERMSIG(status))); |
3c0ef626 | 2174 | #ifdef WCOREDUMP |
2175 | packet_put_char(WCOREDUMP(status)); | |
2176 | #else /* WCOREDUMP */ | |
2177 | packet_put_char(0); | |
2178 | #endif /* WCOREDUMP */ | |
2179 | packet_put_cstring(""); | |
2180 | packet_put_cstring(""); | |
2181 | packet_send(); | |
2182 | } else { | |
2183 | /* Some weird exit cause. Just exit. */ | |
2184 | packet_disconnect("wait returned status %04x.", status); | |
2185 | } | |
2186 | ||
2187 | /* disconnect channel */ | |
2188 | debug("session_exit_message: release channel %d", s->chanid); | |
2c06c99b | 2189 | |
2190 | /* | |
2191 | * Adjust cleanup callback attachment to send close messages when | |
2192 | * the channel gets EOF. The session will be then be closed | |
2193 | * by session_close_by_channel when the childs close their fds. | |
2194 | */ | |
2195 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2196 | ||
3c0ef626 | 2197 | /* |
2198 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2199 | * interested in data we write. | |
2200 | * Note that we must not call 'chan_read_failed', since there could | |
2201 | * be some more data waiting in the pipe. | |
2202 | */ | |
2203 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2204 | chan_write_failed(c); | |
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); | |
2c06c99b | 2248 | if (s->ttyfd != -1) |
2249 | session_pty_cleanup(s); | |
f2f068fa | 2250 | s->pid = 0; |
3c0ef626 | 2251 | } |
2252 | ||
2253 | /* | |
2254 | * this is called when a channel dies before | |
2255 | * the session 'child' itself dies | |
2256 | */ | |
2257 | void | |
2258 | session_close_by_channel(int id, void *arg) | |
2259 | { | |
2260 | Session *s = session_by_channel(id); | |
2c06c99b | 2261 | u_int i; |
665a873d | 2262 | |
3c0ef626 | 2263 | if (s == NULL) { |
2264 | debug("session_close_by_channel: no session for id %d", id); | |
2265 | return; | |
2266 | } | |
f5799ae1 | 2267 | debug("session_close_by_channel: channel %d child %ld", |
2268 | id, (long)s->pid); | |
3c0ef626 | 2269 | if (s->pid != 0) { |
2270 | debug("session_close_by_channel: channel %d: has child", id); | |
2271 | /* | |
2272 | * delay detach of session, but release pty, since | |
2273 | * the fd's to the child are already closed | |
2274 | */ | |
cdd66111 | 2275 | if (s->ttyfd != -1) |
3c0ef626 | 2276 | session_pty_cleanup(s); |
3c0ef626 | 2277 | return; |
2278 | } | |
2279 | /* detach by removing callback */ | |
2280 | channel_cancel_cleanup(s->chanid); | |
2c06c99b | 2281 | |
2282 | /* Close any X11 listeners associated with this session */ | |
2283 | if (s->x11_chanids != NULL) { | |
2284 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2285 | session_close_x11(s->x11_chanids[i]); | |
2286 | s->x11_chanids[i] = -1; | |
2287 | } | |
2288 | } | |
2289 | ||
3c0ef626 | 2290 | s->chanid = -1; |
2291 | session_close(s); | |
2292 | } | |
2293 | ||
2294 | void | |
700318f3 | 2295 | session_destroy_all(void (*closefunc)(Session *)) |
3c0ef626 | 2296 | { |
2297 | int i; | |
e9a17296 | 2298 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2299 | Session *s = &sessions[i]; |
700318f3 | 2300 | if (s->used) { |
2301 | if (closefunc != NULL) | |
2302 | closefunc(s); | |
2303 | else | |
2304 | session_close(s); | |
2305 | } | |
3c0ef626 | 2306 | } |
2307 | } | |
2308 | ||
2309 | static char * | |
2310 | session_tty_list(void) | |
2311 | { | |
2312 | static char buf[1024]; | |
2313 | int i; | |
6a9b3198 | 2314 | char *cp; |
2315 | ||
3c0ef626 | 2316 | buf[0] = '\0'; |
e9a17296 | 2317 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2318 | Session *s = &sessions[i]; |
2319 | if (s->used && s->ttyfd != -1) { | |
cdd66111 | 2320 | |
6a9b3198 | 2321 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2322 | cp = strrchr(s->tty, '/'); | |
2323 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2324 | } else | |
2325 | cp = s->tty + 5; | |
cdd66111 | 2326 | |
3c0ef626 | 2327 | if (buf[0] != '\0') |
2328 | strlcat(buf, ",", sizeof buf); | |
6a9b3198 | 2329 | strlcat(buf, cp, sizeof buf); |
3c0ef626 | 2330 | } |
2331 | } | |
2332 | if (buf[0] == '\0') | |
2333 | strlcpy(buf, "notty", sizeof buf); | |
2334 | return buf; | |
2335 | } | |
2336 | ||
2337 | void | |
2338 | session_proctitle(Session *s) | |
2339 | { | |
2340 | if (s->pw == NULL) | |
2341 | error("no user for session %d", s->self); | |
2342 | else | |
2343 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2344 | } | |
2345 | ||
2346 | int | |
2347 | session_setup_x11fwd(Session *s) | |
2348 | { | |
2349 | struct stat st; | |
e9a17296 | 2350 | char display[512], auth_display[512]; |
2351 | char hostname[MAXHOSTNAMELEN]; | |
665a873d | 2352 | u_int i; |
3c0ef626 | 2353 | |
2354 | if (no_x11_forwarding_flag) { | |
2355 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2356 | return 0; | |
2357 | } | |
2358 | if (!options.x11_forwarding) { | |
2359 | debug("X11 forwarding disabled in server configuration file."); | |
2360 | return 0; | |
2361 | } | |
2362 | if (!options.xauth_location || | |
2363 | (stat(options.xauth_location, &st) == -1)) { | |
2364 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2365 | return 0; | |
2366 | } | |
2367 | if (options.use_login) { | |
2368 | packet_send_debug("X11 forwarding disabled; " | |
2369 | "not compatible with UseLogin=yes."); | |
2370 | return 0; | |
2371 | } | |
2372 | if (s->display != NULL) { | |
2373 | debug("X11 display already set."); | |
2374 | return 0; | |
2375 | } | |
680cee3b | 2376 | if (x11_create_display_inet(options.x11_display_offset, |
2377 | options.x11_use_localhost, s->single_connection, | |
d4e9cd2c | 2378 | &s->display_number, &s->x11_chanids, |
2379 | options.hpn_disabled, options.hpn_buffer_size) == -1) { | |
3c0ef626 | 2380 | debug("x11_create_display_inet failed."); |
2381 | return 0; | |
2382 | } | |
665a873d | 2383 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2384 | channel_register_cleanup(s->x11_chanids[i], | |
2c06c99b | 2385 | session_close_single_x11, 0); |
665a873d | 2386 | } |
e9a17296 | 2387 | |
2388 | /* Set up a suitable value for the DISPLAY variable. */ | |
2389 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2390 | fatal("gethostname: %.100s", strerror(errno)); | |
2391 | /* | |
2392 | * auth_display must be used as the displayname when the | |
2393 | * authorization entry is added with xauth(1). This will be | |
2394 | * different than the DISPLAY string for localhost displays. | |
2395 | */ | |
2396 | if (options.x11_use_localhost) { | |
680cee3b | 2397 | snprintf(display, sizeof display, "localhost:%u.%u", |
e9a17296 | 2398 | s->display_number, s->screen); |
680cee3b | 2399 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
e9a17296 | 2400 | s->display_number, s->screen); |
2401 | s->display = xstrdup(display); | |
2402 | s->auth_display = xstrdup(auth_display); | |
2403 | } else { | |
2404 | #ifdef IPADDR_IN_DISPLAY | |
2405 | struct hostent *he; | |
2406 | struct in_addr my_addr; | |
2407 | ||
2408 | he = gethostbyname(hostname); | |
2409 | if (he == NULL) { | |
2410 | error("Can't get IP address for X11 DISPLAY."); | |
2411 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2412 | return 0; | |
2413 | } | |
2414 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
680cee3b | 2415 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
e9a17296 | 2416 | s->display_number, s->screen); |
2417 | #else | |
680cee3b | 2418 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
e9a17296 | 2419 | s->display_number, s->screen); |
2420 | #endif | |
2421 | s->display = xstrdup(display); | |
2422 | s->auth_display = xstrdup(display); | |
2423 | } | |
2424 | ||
3c0ef626 | 2425 | return 1; |
2426 | } | |
2427 | ||
2428 | static void | |
2429 | do_authenticated2(Authctxt *authctxt) | |
2430 | { | |
2431 | server_loop2(authctxt); | |
cdd66111 | 2432 | } |
2433 | ||
2434 | void | |
2435 | do_cleanup(Authctxt *authctxt) | |
2436 | { | |
2437 | static int called = 0; | |
2438 | ||
2439 | debug("do_cleanup"); | |
2440 | ||
2441 | /* no cleanup if we're in the child for login shell */ | |
2442 | if (is_child) | |
2443 | return; | |
2444 | ||
2445 | /* avoid double cleanup */ | |
2446 | if (called) | |
2447 | return; | |
2448 | called = 1; | |
2449 | ||
2450 | if (authctxt == NULL) | |
2451 | return; | |
2452 | #ifdef KRB5 | |
2453 | if (options.kerberos_ticket_cleanup && | |
2454 | authctxt->krb5_ctx) | |
2455 | krb5_cleanup_proc(authctxt); | |
0fff78ff | 2456 | #endif |
cdd66111 | 2457 | |
2458 | #ifdef GSSAPI | |
2459 | if (compat20 && options.gss_cleanup_creds) | |
2460 | ssh_gssapi_cleanup_creds(); | |
2461 | #endif | |
2462 | ||
2463 | #ifdef USE_PAM | |
2464 | if (options.use_pam) { | |
2465 | sshpam_cleanup(); | |
2466 | sshpam_thread_cleanup(); | |
2467 | } | |
2468 | #endif | |
2469 | ||
2470 | /* remove agent socket */ | |
2471 | auth_sock_cleanup_proc(authctxt->pw); | |
2472 | ||
2473 | /* | |
2474 | * Cleanup ptys/utmp only if privsep is disabled, | |
2475 | * or if running in monitor. | |
2476 | */ | |
2477 | if (!use_privsep || mm_is_monitor()) | |
2478 | session_destroy_all(session_pty_cleanup2); | |
3c0ef626 | 2479 | } |