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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" | |
c9f39d2c | 36 | RCSID("$OpenBSD: session.c,v 1.180 2004/07/28 09:40:29 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" | |
700318f3 | 59 | #include "monitor_wrap.h" |
3c0ef626 | 60 | |
cdd66111 | 61 | #if defined(KRB5) && defined(USE_AFS) |
62 | #include <kafs.h> | |
63 | #endif | |
64 | ||
0fff78ff | 65 | #ifdef GSSAPI |
66 | #include "ssh-gss.h" | |
3c0ef626 | 67 | #endif |
68 | ||
3c0ef626 | 69 | /* func */ |
70 | ||
71 | Session *session_new(void); | |
72 | void session_set_fds(Session *, int, int, int); | |
cdd66111 | 73 | void session_pty_cleanup(Session *); |
3c0ef626 | 74 | void session_proctitle(Session *); |
75 | int session_setup_x11fwd(Session *); | |
76 | void do_exec_pty(Session *, const char *); | |
77 | void do_exec_no_pty(Session *, const char *); | |
78 | void do_exec(Session *, const char *); | |
79 | void do_login(Session *, const char *); | |
80 | #ifdef LOGIN_NEEDS_UTMPX | |
81 | static void do_pre_login(Session *s); | |
82 | #endif | |
83 | void do_child(Session *, const char *); | |
84 | void do_motd(void); | |
85 | int check_quietlogin(Session *, const char *); | |
86 | ||
87 | static void do_authenticated1(Authctxt *); | |
88 | static void do_authenticated2(Authctxt *); | |
89 | ||
3c0ef626 | 90 | static int session_pty_req(Session *); |
91 | ||
92 | /* import */ | |
93 | extern ServerOptions options; | |
94 | extern char *__progname; | |
95 | extern int log_stderr; | |
96 | extern int debug_flag; | |
97 | extern u_int utmp_len; | |
98 | extern int startup_pipe; | |
99 | extern void destroy_sensitive_data(void); | |
0fff78ff | 100 | extern Buffer loginmsg; |
3c0ef626 | 101 | |
102 | /* original command from peer. */ | |
103 | const char *original_command = NULL; | |
104 | ||
105 | /* data */ | |
106 | #define MAX_SESSIONS 10 | |
107 | Session sessions[MAX_SESSIONS]; | |
108 | ||
3c0ef626 | 109 | #ifdef HAVE_LOGIN_CAP |
700318f3 | 110 | login_cap_t *lc; |
3c0ef626 | 111 | #endif |
112 | ||
cdd66111 | 113 | static int is_child = 0; |
114 | ||
f5799ae1 | 115 | /* Name and directory of socket for authentication agent forwarding. */ |
116 | static char *auth_sock_name = NULL; | |
117 | static char *auth_sock_dir = NULL; | |
118 | ||
119 | /* removes the agent forwarding socket */ | |
120 | ||
121 | static void | |
cdd66111 | 122 | auth_sock_cleanup_proc(struct passwd *pw) |
f5799ae1 | 123 | { |
f5799ae1 | 124 | if (auth_sock_name != NULL) { |
125 | temporarily_use_uid(pw); | |
126 | unlink(auth_sock_name); | |
127 | rmdir(auth_sock_dir); | |
128 | auth_sock_name = NULL; | |
129 | restore_uid(); | |
130 | } | |
131 | } | |
132 | ||
133 | static int | |
134 | auth_input_request_forwarding(struct passwd * pw) | |
135 | { | |
136 | Channel *nc; | |
137 | int sock; | |
138 | struct sockaddr_un sunaddr; | |
139 | ||
140 | if (auth_sock_name != NULL) { | |
141 | error("authentication forwarding requested twice."); | |
142 | return 0; | |
143 | } | |
144 | ||
145 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
146 | temporarily_use_uid(pw); | |
147 | ||
148 | /* Allocate a buffer for the socket name, and format the name. */ | |
149 | auth_sock_name = xmalloc(MAXPATHLEN); | |
150 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
cdd66111 | 151 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
f5799ae1 | 152 | |
153 | /* Create private directory for socket */ | |
154 | if (mkdtemp(auth_sock_dir) == NULL) { | |
155 | packet_send_debug("Agent forwarding disabled: " | |
156 | "mkdtemp() failed: %.100s", strerror(errno)); | |
157 | restore_uid(); | |
158 | xfree(auth_sock_name); | |
159 | xfree(auth_sock_dir); | |
160 | auth_sock_name = NULL; | |
161 | auth_sock_dir = NULL; | |
162 | return 0; | |
163 | } | |
164 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", | |
165 | auth_sock_dir, (long) getpid()); | |
166 | ||
f5799ae1 | 167 | /* Create the socket. */ |
168 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
169 | if (sock < 0) | |
170 | packet_disconnect("socket: %.100s", strerror(errno)); | |
171 | ||
172 | /* Bind it to the name. */ | |
173 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
174 | sunaddr.sun_family = AF_UNIX; | |
175 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
176 | ||
177 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
178 | packet_disconnect("bind: %.100s", strerror(errno)); | |
179 | ||
180 | /* Restore the privileged uid. */ | |
181 | restore_uid(); | |
182 | ||
183 | /* Start listening on the socket. */ | |
cdd66111 | 184 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
f5799ae1 | 185 | packet_disconnect("listen: %.100s", strerror(errno)); |
186 | ||
187 | /* Allocate a channel for the authentication agent socket. */ | |
188 | nc = channel_new("auth socket", | |
189 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
190 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0fff78ff | 191 | 0, "auth socket", 1); |
f5799ae1 | 192 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
193 | return 1; | |
194 | } | |
195 | ||
cdd66111 | 196 | static void |
197 | display_loginmsg(void) | |
198 | { | |
c9f39d2c | 199 | if (buffer_len(&loginmsg) > 0) { |
200 | buffer_append(&loginmsg, "\0", 1); | |
201 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
202 | buffer_clear(&loginmsg); | |
203 | } | |
cdd66111 | 204 | } |
f5799ae1 | 205 | |
3c0ef626 | 206 | void |
207 | do_authenticated(Authctxt *authctxt) | |
208 | { | |
6a9b3198 | 209 | setproctitle("%s", authctxt->pw->pw_name); |
210 | ||
3c0ef626 | 211 | /* |
212 | * Cancel the alarm we set to limit the time taken for | |
213 | * authentication. | |
214 | */ | |
215 | alarm(0); | |
216 | if (startup_pipe != -1) { | |
217 | close(startup_pipe); | |
218 | startup_pipe = -1; | |
219 | } | |
3c0ef626 | 220 | /* setup the channel layer */ |
221 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
222 | channel_permit_all_opens(); | |
223 | ||
224 | if (compat20) | |
225 | do_authenticated2(authctxt); | |
226 | else | |
227 | do_authenticated1(authctxt); | |
228 | ||
cdd66111 | 229 | do_cleanup(authctxt); |
3c0ef626 | 230 | } |
231 | ||
232 | /* | |
233 | * Prepares for an interactive session. This is called after the user has | |
234 | * been successfully authenticated. During this message exchange, pseudo | |
235 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
236 | * are requested, etc. | |
237 | */ | |
238 | static void | |
239 | do_authenticated1(Authctxt *authctxt) | |
240 | { | |
241 | Session *s; | |
242 | char *command; | |
e9a17296 | 243 | int success, type, screen_flag; |
680cee3b | 244 | int enable_compression_after_reply = 0; |
245 | u_int proto_len, data_len, dlen, compression_level = 0; | |
3c0ef626 | 246 | |
247 | s = session_new(); | |
248 | s->authctxt = authctxt; | |
249 | s->pw = authctxt->pw; | |
250 | ||
251 | /* | |
252 | * We stay in this loop until the client requests to execute a shell | |
253 | * or a command. | |
254 | */ | |
255 | for (;;) { | |
256 | success = 0; | |
257 | ||
258 | /* Get a packet from the client. */ | |
e9a17296 | 259 | type = packet_read(); |
3c0ef626 | 260 | |
261 | /* Process the packet. */ | |
262 | switch (type) { | |
263 | case SSH_CMSG_REQUEST_COMPRESSION: | |
3c0ef626 | 264 | compression_level = packet_get_int(); |
e9a17296 | 265 | packet_check_eom(); |
3c0ef626 | 266 | if (compression_level < 1 || compression_level > 9) { |
c9f39d2c | 267 | packet_send_debug("Received invalid compression level %d.", |
e9a17296 | 268 | compression_level); |
3c0ef626 | 269 | break; |
270 | } | |
f5799ae1 | 271 | if (!options.compression) { |
272 | debug2("compression disabled"); | |
273 | break; | |
274 | } | |
3c0ef626 | 275 | /* Enable compression after we have responded with SUCCESS. */ |
276 | enable_compression_after_reply = 1; | |
277 | success = 1; | |
278 | break; | |
279 | ||
280 | case SSH_CMSG_REQUEST_PTY: | |
281 | success = session_pty_req(s); | |
282 | break; | |
283 | ||
284 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
285 | s->auth_proto = packet_get_string(&proto_len); | |
286 | s->auth_data = packet_get_string(&data_len); | |
287 | ||
288 | screen_flag = packet_get_protocol_flags() & | |
289 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
290 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
291 | ||
292 | if (packet_remaining() == 4) { | |
293 | if (!screen_flag) | |
294 | debug2("Buggy client: " | |
295 | "X11 screen flag missing"); | |
296 | s->screen = packet_get_int(); | |
297 | } else { | |
298 | s->screen = 0; | |
299 | } | |
e9a17296 | 300 | packet_check_eom(); |
3c0ef626 | 301 | success = session_setup_x11fwd(s); |
302 | if (!success) { | |
303 | xfree(s->auth_proto); | |
304 | xfree(s->auth_data); | |
305 | s->auth_proto = NULL; | |
306 | s->auth_data = NULL; | |
307 | } | |
308 | break; | |
309 | ||
310 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
311 | if (no_agent_forwarding_flag || compat13) { | |
312 | debug("Authentication agent forwarding not permitted for this authentication."); | |
313 | break; | |
314 | } | |
315 | debug("Received authentication agent forwarding request."); | |
316 | success = auth_input_request_forwarding(s->pw); | |
317 | break; | |
318 | ||
319 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
320 | if (no_port_forwarding_flag) { | |
321 | debug("Port forwarding not permitted for this authentication."); | |
322 | break; | |
323 | } | |
324 | if (!options.allow_tcp_forwarding) { | |
325 | debug("Port forwarding not permitted."); | |
326 | break; | |
327 | } | |
328 | debug("Received TCP/IP port forwarding request."); | |
329 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); | |
330 | success = 1; | |
331 | break; | |
332 | ||
333 | case SSH_CMSG_MAX_PACKET_SIZE: | |
334 | if (packet_set_maxsize(packet_get_int()) > 0) | |
335 | success = 1; | |
336 | break; | |
e9a17296 | 337 | |
3c0ef626 | 338 | case SSH_CMSG_EXEC_SHELL: |
339 | case SSH_CMSG_EXEC_CMD: | |
340 | if (type == SSH_CMSG_EXEC_CMD) { | |
341 | command = packet_get_string(&dlen); | |
342 | debug("Exec command '%.500s'", command); | |
343 | do_exec(s, command); | |
344 | xfree(command); | |
345 | } else { | |
346 | do_exec(s, NULL); | |
347 | } | |
e9a17296 | 348 | packet_check_eom(); |
3c0ef626 | 349 | session_close(s); |
350 | return; | |
351 | ||
352 | default: | |
353 | /* | |
354 | * Any unknown messages in this phase are ignored, | |
355 | * and a failure message is returned. | |
356 | */ | |
0fff78ff | 357 | logit("Unknown packet type received after authentication: %d", type); |
3c0ef626 | 358 | } |
359 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
360 | packet_send(); | |
361 | packet_write_wait(); | |
362 | ||
363 | /* Enable compression now that we have replied if appropriate. */ | |
364 | if (enable_compression_after_reply) { | |
365 | enable_compression_after_reply = 0; | |
366 | packet_start_compression(compression_level); | |
367 | } | |
368 | } | |
369 | } | |
370 | ||
371 | /* | |
372 | * This is called to fork and execute a command when we have no tty. This | |
373 | * will call do_child from the child, and server_loop from the parent after | |
374 | * setting up file descriptors and such. | |
375 | */ | |
376 | void | |
377 | do_exec_no_pty(Session *s, const char *command) | |
378 | { | |
f5799ae1 | 379 | pid_t pid; |
3c0ef626 | 380 | |
381 | #ifdef USE_PIPES | |
382 | int pin[2], pout[2], perr[2]; | |
383 | /* Allocate pipes for communicating with the program. */ | |
384 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
385 | packet_disconnect("Could not create pipes: %.100s", | |
386 | strerror(errno)); | |
387 | #else /* USE_PIPES */ | |
388 | int inout[2], err[2]; | |
389 | /* Uses socket pairs to communicate with the program. */ | |
390 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
391 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
392 | packet_disconnect("Could not create socket pairs: %.100s", | |
393 | strerror(errno)); | |
394 | #endif /* USE_PIPES */ | |
395 | if (s == NULL) | |
396 | fatal("do_exec_no_pty: no session"); | |
397 | ||
398 | session_proctitle(s); | |
399 | ||
400 | #if defined(USE_PAM) | |
cdd66111 | 401 | if (options.use_pam && !use_privsep) |
0fff78ff | 402 | do_pam_setcred(1); |
3c0ef626 | 403 | #endif /* USE_PAM */ |
404 | ||
405 | /* Fork the child. */ | |
406 | if ((pid = fork()) == 0) { | |
cdd66111 | 407 | is_child = 1; |
41b2f314 | 408 | |
3c0ef626 | 409 | /* Child. Reinitialize the log since the pid has changed. */ |
410 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
411 | ||
412 | /* | |
413 | * Create a new session and process group since the 4.4BSD | |
414 | * setlogin() affects the entire process group. | |
415 | */ | |
416 | if (setsid() < 0) | |
417 | error("setsid failed: %.100s", strerror(errno)); | |
418 | ||
419 | #ifdef USE_PIPES | |
420 | /* | |
421 | * Redirect stdin. We close the parent side of the socket | |
422 | * pair, and make the child side the standard input. | |
423 | */ | |
424 | close(pin[1]); | |
425 | if (dup2(pin[0], 0) < 0) | |
426 | perror("dup2 stdin"); | |
427 | close(pin[0]); | |
428 | ||
429 | /* Redirect stdout. */ | |
430 | close(pout[0]); | |
431 | if (dup2(pout[1], 1) < 0) | |
432 | perror("dup2 stdout"); | |
433 | close(pout[1]); | |
434 | ||
435 | /* Redirect stderr. */ | |
436 | close(perr[0]); | |
437 | if (dup2(perr[1], 2) < 0) | |
438 | perror("dup2 stderr"); | |
439 | close(perr[1]); | |
440 | #else /* USE_PIPES */ | |
441 | /* | |
442 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
443 | * use the same socket, as some programs (particularly rdist) | |
444 | * seem to depend on it. | |
445 | */ | |
446 | close(inout[1]); | |
447 | close(err[1]); | |
448 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
449 | perror("dup2 stdin"); | |
450 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
451 | perror("dup2 stdout"); | |
452 | if (dup2(err[0], 2) < 0) /* stderr */ | |
453 | perror("dup2 stderr"); | |
454 | #endif /* USE_PIPES */ | |
455 | ||
41b2f314 | 456 | #ifdef _UNICOS |
457 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
458 | #endif | |
459 | ||
3c0ef626 | 460 | /* Do processing for the child (exec command etc). */ |
461 | do_child(s, command); | |
462 | /* NOTREACHED */ | |
463 | } | |
41b2f314 | 464 | #ifdef _UNICOS |
465 | signal(WJSIGNAL, cray_job_termination_handler); | |
466 | #endif /* _UNICOS */ | |
3c0ef626 | 467 | #ifdef HAVE_CYGWIN |
468 | if (is_winnt) | |
469 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
470 | #endif | |
471 | if (pid < 0) | |
472 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
473 | s->pid = pid; | |
474 | /* Set interactive/non-interactive mode. */ | |
475 | packet_set_interactive(s->display != NULL); | |
476 | #ifdef USE_PIPES | |
477 | /* We are the parent. Close the child sides of the pipes. */ | |
478 | close(pin[0]); | |
479 | close(pout[1]); | |
480 | close(perr[1]); | |
481 | ||
482 | if (compat20) { | |
c9f39d2c | 483 | if (s->is_subsystem) { |
484 | close(perr[0]); | |
485 | perr[0] = -1; | |
486 | } | |
487 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
3c0ef626 | 488 | } else { |
489 | /* Enter the interactive session. */ | |
490 | server_loop(pid, pin[1], pout[0], perr[0]); | |
491 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ | |
492 | } | |
493 | #else /* USE_PIPES */ | |
494 | /* We are the parent. Close the child sides of the socket pairs. */ | |
495 | close(inout[0]); | |
496 | close(err[0]); | |
497 | ||
99be0775 | 498 | /* |
499 | * Clear loginmsg, since it's the child's responsibility to display | |
500 | * it to the user, otherwise multiple sessions may accumulate | |
501 | * multiple copies of the login messages. | |
502 | */ | |
503 | buffer_clear(&loginmsg); | |
504 | ||
3c0ef626 | 505 | /* |
506 | * Enter the interactive session. Note: server_loop must be able to | |
507 | * handle the case that fdin and fdout are the same. | |
508 | */ | |
509 | if (compat20) { | |
510 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); | |
511 | } else { | |
512 | server_loop(pid, inout[1], inout[1], err[1]); | |
513 | /* server_loop has closed inout[1] and err[1]. */ | |
514 | } | |
515 | #endif /* USE_PIPES */ | |
516 | } | |
517 | ||
518 | /* | |
519 | * This is called to fork and execute a command when we have a tty. This | |
520 | * will call do_child from the child, and server_loop from the parent after | |
521 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
522 | * lastlog, and other such operations. | |
523 | */ | |
524 | void | |
525 | do_exec_pty(Session *s, const char *command) | |
526 | { | |
527 | int fdout, ptyfd, ttyfd, ptymaster; | |
528 | pid_t pid; | |
529 | ||
530 | if (s == NULL) | |
531 | fatal("do_exec_pty: no session"); | |
532 | ptyfd = s->ptyfd; | |
533 | ttyfd = s->ttyfd; | |
534 | ||
535 | #if defined(USE_PAM) | |
0fff78ff | 536 | if (options.use_pam) { |
537 | do_pam_set_tty(s->tty); | |
cdd66111 | 538 | if (!use_privsep) |
539 | do_pam_setcred(1); | |
0fff78ff | 540 | } |
3c0ef626 | 541 | #endif |
542 | ||
543 | /* Fork the child. */ | |
544 | if ((pid = fork()) == 0) { | |
cdd66111 | 545 | is_child = 1; |
3c0ef626 | 546 | |
547 | /* Child. Reinitialize the log because the pid has changed. */ | |
548 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
549 | /* Close the master side of the pseudo tty. */ | |
550 | close(ptyfd); | |
551 | ||
552 | /* Make the pseudo tty our controlling tty. */ | |
553 | pty_make_controlling_tty(&ttyfd, s->tty); | |
554 | ||
555 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ | |
556 | if (dup2(ttyfd, 0) < 0) | |
557 | error("dup2 stdin: %s", strerror(errno)); | |
558 | if (dup2(ttyfd, 1) < 0) | |
559 | error("dup2 stdout: %s", strerror(errno)); | |
560 | if (dup2(ttyfd, 2) < 0) | |
561 | error("dup2 stderr: %s", strerror(errno)); | |
562 | ||
563 | /* Close the extra descriptor for the pseudo tty. */ | |
564 | close(ttyfd); | |
565 | ||
566 | /* record login, etc. similar to login(1) */ | |
567 | #ifndef HAVE_OSF_SIA | |
41b2f314 | 568 | if (!(options.use_login && command == NULL)) { |
569 | #ifdef _UNICOS | |
570 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
571 | #endif /* _UNICOS */ | |
3c0ef626 | 572 | do_login(s, command); |
41b2f314 | 573 | } |
3c0ef626 | 574 | # ifdef LOGIN_NEEDS_UTMPX |
575 | else | |
576 | do_pre_login(s); | |
577 | # endif | |
578 | #endif | |
579 | ||
580 | /* Do common processing for the child, such as execing the command. */ | |
581 | do_child(s, command); | |
582 | /* NOTREACHED */ | |
583 | } | |
41b2f314 | 584 | #ifdef _UNICOS |
585 | signal(WJSIGNAL, cray_job_termination_handler); | |
586 | #endif /* _UNICOS */ | |
3c0ef626 | 587 | #ifdef HAVE_CYGWIN |
588 | if (is_winnt) | |
589 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
590 | #endif | |
591 | if (pid < 0) | |
592 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
593 | s->pid = pid; | |
594 | ||
595 | /* Parent. Close the slave side of the pseudo tty. */ | |
596 | close(ttyfd); | |
597 | ||
598 | /* | |
599 | * Create another descriptor of the pty master side for use as the | |
600 | * standard input. We could use the original descriptor, but this | |
601 | * simplifies code in server_loop. The descriptor is bidirectional. | |
602 | */ | |
603 | fdout = dup(ptyfd); | |
604 | if (fdout < 0) | |
605 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
606 | ||
607 | /* we keep a reference to the pty master */ | |
608 | ptymaster = dup(ptyfd); | |
609 | if (ptymaster < 0) | |
610 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
611 | s->ptymaster = ptymaster; | |
612 | ||
613 | /* Enter interactive session. */ | |
614 | packet_set_interactive(1); | |
615 | if (compat20) { | |
616 | session_set_fds(s, ptyfd, fdout, -1); | |
617 | } else { | |
618 | server_loop(pid, ptyfd, fdout, -1); | |
619 | /* server_loop _has_ closed ptyfd and fdout. */ | |
620 | } | |
621 | } | |
622 | ||
623 | #ifdef LOGIN_NEEDS_UTMPX | |
624 | static void | |
625 | do_pre_login(Session *s) | |
626 | { | |
627 | socklen_t fromlen; | |
628 | struct sockaddr_storage from; | |
629 | pid_t pid = getpid(); | |
630 | ||
631 | /* | |
632 | * Get IP address of client. If the connection is not a socket, let | |
633 | * the address be 0.0.0.0. | |
634 | */ | |
635 | memset(&from, 0, sizeof(from)); | |
41b2f314 | 636 | fromlen = sizeof(from); |
3c0ef626 | 637 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 638 | if (getpeername(packet_get_connection_in(), |
e9a17296 | 639 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 640 | debug("getpeername: %.100s", strerror(errno)); |
cdd66111 | 641 | cleanup_exit(255); |
3c0ef626 | 642 | } |
643 | } | |
644 | ||
645 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
0fff78ff | 646 | get_remote_name_or_ip(utmp_len, options.use_dns), |
6a9b3198 | 647 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 648 | } |
649 | #endif | |
650 | ||
651 | /* | |
652 | * This is called to fork and execute a command. If another command is | |
653 | * to be forced, execute that instead. | |
654 | */ | |
655 | void | |
656 | do_exec(Session *s, const char *command) | |
657 | { | |
658 | if (forced_command) { | |
659 | original_command = command; | |
660 | command = forced_command; | |
661 | debug("Forced command '%.900s'", command); | |
662 | } | |
663 | ||
0fff78ff | 664 | #ifdef GSSAPI |
665 | if (options.gss_authentication) { | |
666 | temporarily_use_uid(s->pw); | |
667 | ssh_gssapi_storecreds(); | |
668 | restore_uid(); | |
669 | } | |
670 | #endif | |
671 | ||
3c0ef626 | 672 | if (s->ttyfd != -1) |
673 | do_exec_pty(s, command); | |
674 | else | |
675 | do_exec_no_pty(s, command); | |
676 | ||
677 | original_command = NULL; | |
3c0ef626 | 678 | |
c9f39d2c | 679 | /* |
680 | * Clear loginmsg: it's the child's responsibility to display | |
681 | * it to the user, otherwise multiple sessions may accumulate | |
682 | * multiple copies of the login messages. | |
683 | */ | |
684 | buffer_clear(&loginmsg); | |
685 | } | |
e9a17296 | 686 | |
3c0ef626 | 687 | /* administrative, login(1)-like work */ |
688 | void | |
689 | do_login(Session *s, const char *command) | |
690 | { | |
3c0ef626 | 691 | socklen_t fromlen; |
692 | struct sockaddr_storage from; | |
3c0ef626 | 693 | struct passwd * pw = s->pw; |
694 | pid_t pid = getpid(); | |
695 | ||
696 | /* | |
697 | * Get IP address of client. If the connection is not a socket, let | |
698 | * the address be 0.0.0.0. | |
699 | */ | |
700 | memset(&from, 0, sizeof(from)); | |
6a9b3198 | 701 | fromlen = sizeof(from); |
3c0ef626 | 702 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 703 | if (getpeername(packet_get_connection_in(), |
e9a17296 | 704 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 705 | debug("getpeername: %.100s", strerror(errno)); |
cdd66111 | 706 | cleanup_exit(255); |
3c0ef626 | 707 | } |
708 | } | |
709 | ||
3c0ef626 | 710 | /* Record that there was a login on that tty from the remote host. */ |
700318f3 | 711 | if (!use_privsep) |
712 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
713 | get_remote_name_or_ip(utmp_len, | |
0fff78ff | 714 | options.use_dns), |
41b2f314 | 715 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 716 | |
717 | #ifdef USE_PAM | |
718 | /* | |
719 | * If password change is needed, do it now. | |
720 | * This needs to occur before the ~/.hushlogin check. | |
721 | */ | |
cdd66111 | 722 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
723 | display_loginmsg(); | |
3c0ef626 | 724 | do_pam_chauthtok(); |
cdd66111 | 725 | s->authctxt->force_pwchange = 0; |
0fff78ff | 726 | /* XXX - signal [net] parent to enable forwardings */ |
3c0ef626 | 727 | } |
728 | #endif | |
729 | ||
730 | if (check_quietlogin(s, command)) | |
731 | return; | |
732 | ||
cdd66111 | 733 | display_loginmsg(); |
3c0ef626 | 734 | |
3c0ef626 | 735 | do_motd(); |
736 | } | |
737 | ||
738 | /* | |
739 | * Display the message of the day. | |
740 | */ | |
741 | void | |
742 | do_motd(void) | |
743 | { | |
744 | FILE *f; | |
745 | char buf[256]; | |
746 | ||
747 | if (options.print_motd) { | |
748 | #ifdef HAVE_LOGIN_CAP | |
749 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
750 | "/etc/motd"), "r"); | |
751 | #else | |
752 | f = fopen("/etc/motd", "r"); | |
753 | #endif | |
754 | if (f) { | |
755 | while (fgets(buf, sizeof(buf), f)) | |
756 | fputs(buf, stdout); | |
757 | fclose(f); | |
758 | } | |
759 | } | |
760 | } | |
761 | ||
762 | ||
763 | /* | |
764 | * Check for quiet login, either .hushlogin or command given. | |
765 | */ | |
766 | int | |
767 | check_quietlogin(Session *s, const char *command) | |
768 | { | |
769 | char buf[256]; | |
770 | struct passwd *pw = s->pw; | |
771 | struct stat st; | |
772 | ||
773 | /* Return 1 if .hushlogin exists or a command given. */ | |
774 | if (command != NULL) | |
775 | return 1; | |
776 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
777 | #ifdef HAVE_LOGIN_CAP | |
778 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
779 | return 1; | |
780 | #else | |
781 | if (stat(buf, &st) >= 0) | |
782 | return 1; | |
783 | #endif | |
784 | return 0; | |
785 | } | |
786 | ||
787 | /* | |
788 | * Sets the value of the given variable in the environment. If the variable | |
789 | * already exists, its value is overriden. | |
790 | */ | |
0fff78ff | 791 | void |
3c0ef626 | 792 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
e9a17296 | 793 | const char *value) |
3c0ef626 | 794 | { |
3c0ef626 | 795 | char **env; |
acc3d05e | 796 | u_int envsize; |
797 | u_int i, namelen; | |
3c0ef626 | 798 | |
0fff78ff | 799 | /* |
800 | * If we're passed an uninitialized list, allocate a single null | |
801 | * entry before continuing. | |
802 | */ | |
803 | if (*envp == NULL && *envsizep == 0) { | |
804 | *envp = xmalloc(sizeof(char *)); | |
805 | *envp[0] = NULL; | |
806 | *envsizep = 1; | |
807 | } | |
808 | ||
3c0ef626 | 809 | /* |
810 | * Find the slot where the value should be stored. If the variable | |
811 | * already exists, we reuse the slot; otherwise we append a new slot | |
812 | * at the end of the array, expanding if necessary. | |
813 | */ | |
814 | env = *envp; | |
815 | namelen = strlen(name); | |
816 | for (i = 0; env[i]; i++) | |
817 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
818 | break; | |
819 | if (env[i]) { | |
820 | /* Reuse the slot. */ | |
821 | xfree(env[i]); | |
822 | } else { | |
823 | /* New variable. Expand if necessary. */ | |
acc3d05e | 824 | envsize = *envsizep; |
825 | if (i >= envsize - 1) { | |
826 | if (envsize >= 1000) | |
827 | fatal("child_set_env: too many env vars"); | |
828 | envsize += 50; | |
829 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); | |
830 | *envsizep = envsize; | |
3c0ef626 | 831 | } |
832 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
833 | env[i + 1] = NULL; | |
834 | } | |
835 | ||
836 | /* Allocate space and format the variable in the appropriate slot. */ | |
837 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
838 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
839 | } | |
840 | ||
841 | /* | |
842 | * Reads environment variables from the given file and adds/overrides them | |
843 | * into the environment. If the file does not exist, this does nothing. | |
844 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
845 | * and assignments of the form name=value. No other forms are allowed. | |
846 | */ | |
847 | static void | |
848 | read_environment_file(char ***env, u_int *envsize, | |
e9a17296 | 849 | const char *filename) |
3c0ef626 | 850 | { |
851 | FILE *f; | |
852 | char buf[4096]; | |
853 | char *cp, *value; | |
680cee3b | 854 | u_int lineno = 0; |
3c0ef626 | 855 | |
856 | f = fopen(filename, "r"); | |
857 | if (!f) | |
858 | return; | |
859 | ||
860 | while (fgets(buf, sizeof(buf), f)) { | |
680cee3b | 861 | if (++lineno > 1000) |
862 | fatal("Too many lines in environment file %s", filename); | |
3c0ef626 | 863 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
864 | ; | |
865 | if (!*cp || *cp == '#' || *cp == '\n') | |
866 | continue; | |
867 | if (strchr(cp, '\n')) | |
868 | *strchr(cp, '\n') = '\0'; | |
869 | value = strchr(cp, '='); | |
870 | if (value == NULL) { | |
680cee3b | 871 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
872 | filename); | |
3c0ef626 | 873 | continue; |
874 | } | |
875 | /* | |
876 | * Replace the equals sign by nul, and advance value to | |
877 | * the value string. | |
878 | */ | |
879 | *value = '\0'; | |
880 | value++; | |
881 | child_set_env(env, envsize, cp, value); | |
882 | } | |
883 | fclose(f); | |
884 | } | |
885 | ||
0fff78ff | 886 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
887 | /* | |
888 | * Return named variable from specified environment, or NULL if not present. | |
889 | */ | |
890 | static char * | |
891 | child_get_env(char **env, const char *name) | |
892 | { | |
893 | int i; | |
894 | size_t len; | |
895 | ||
896 | len = strlen(name); | |
897 | for (i=0; env[i] != NULL; i++) | |
898 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
899 | return(env[i] + len + 1); | |
900 | return NULL; | |
901 | } | |
902 | ||
903 | /* | |
904 | * Read /etc/default/login. | |
905 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
906 | */ | |
907 | static void | |
908 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
909 | { | |
910 | char **tmpenv = NULL, *var; | |
acc3d05e | 911 | u_int i, tmpenvsize = 0; |
cdd66111 | 912 | u_long mask; |
0fff78ff | 913 | |
914 | /* | |
915 | * We don't want to copy the whole file to the child's environment, | |
916 | * so we use a temporary environment and copy the variables we're | |
917 | * interested in. | |
918 | */ | |
919 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
920 | ||
acc3d05e | 921 | if (tmpenv == NULL) |
922 | return; | |
923 | ||
0fff78ff | 924 | if (uid == 0) |
925 | var = child_get_env(tmpenv, "SUPATH"); | |
926 | else | |
927 | var = child_get_env(tmpenv, "PATH"); | |
928 | if (var != NULL) | |
929 | child_set_env(env, envsize, "PATH", var); | |
cdd66111 | 930 | |
0fff78ff | 931 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
932 | if (sscanf(var, "%5lo", &mask) == 1) | |
cdd66111 | 933 | umask((mode_t)mask); |
934 | ||
0fff78ff | 935 | for (i = 0; tmpenv[i] != NULL; i++) |
936 | xfree(tmpenv[i]); | |
937 | xfree(tmpenv); | |
938 | } | |
939 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
940 | ||
e9a17296 | 941 | void copy_environment(char **source, char ***env, u_int *envsize) |
3c0ef626 | 942 | { |
e9a17296 | 943 | char *var_name, *var_val; |
3c0ef626 | 944 | int i; |
945 | ||
e9a17296 | 946 | if (source == NULL) |
3c0ef626 | 947 | return; |
948 | ||
e9a17296 | 949 | for(i = 0; source[i] != NULL; i++) { |
950 | var_name = xstrdup(source[i]); | |
951 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
952 | xfree(var_name); | |
3c0ef626 | 953 | continue; |
3c0ef626 | 954 | } |
e9a17296 | 955 | *var_val++ = '\0'; |
3c0ef626 | 956 | |
e9a17296 | 957 | debug3("Copy environment: %s=%s", var_name, var_val); |
958 | child_set_env(env, envsize, var_name, var_val); | |
cdd66111 | 959 | |
e9a17296 | 960 | xfree(var_name); |
3c0ef626 | 961 | } |
962 | } | |
3c0ef626 | 963 | |
e9a17296 | 964 | static char ** |
965 | do_setup_env(Session *s, const char *shell) | |
3c0ef626 | 966 | { |
3c0ef626 | 967 | char buf[256]; |
e9a17296 | 968 | u_int i, envsize; |
0fff78ff | 969 | char **env, *laddr, *path = NULL; |
e9a17296 | 970 | struct passwd *pw = s->pw; |
3c0ef626 | 971 | |
972 | /* Initialize the environment. */ | |
973 | envsize = 100; | |
974 | env = xmalloc(envsize * sizeof(char *)); | |
975 | env[0] = NULL; | |
976 | ||
977 | #ifdef HAVE_CYGWIN | |
978 | /* | |
979 | * The Windows environment contains some setting which are | |
980 | * important for a running system. They must not be dropped. | |
981 | */ | |
e9a17296 | 982 | copy_environment(environ, &env, &envsize); |
3c0ef626 | 983 | #endif |
984 | ||
0fff78ff | 985 | #ifdef GSSAPI |
cdd66111 | 986 | /* Allow any GSSAPI methods that we've used to alter |
0fff78ff | 987 | * the childs environment as they see fit |
988 | */ | |
989 | ssh_gssapi_do_child(&env, &envsize); | |
990 | #endif | |
991 | ||
3c0ef626 | 992 | if (!options.use_login) { |
993 | /* Set basic environment. */ | |
c9f39d2c | 994 | for (i = 0; i < s->num_env; i++) |
995 | child_set_env(&env, &envsize, s->env[i].name, | |
996 | s->env[i].val); | |
997 | ||
3c0ef626 | 998 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
999 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
6a9b3198 | 1000 | #ifdef _AIX |
1001 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1002 | #endif | |
3c0ef626 | 1003 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
1004 | #ifdef HAVE_LOGIN_CAP | |
41b2f314 | 1005 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1006 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1007 | else | |
1008 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
3c0ef626 | 1009 | #else /* HAVE_LOGIN_CAP */ |
1010 | # ifndef HAVE_CYGWIN | |
1011 | /* | |
1012 | * There's no standard path on Windows. The path contains | |
1013 | * important components pointing to the system directories, | |
1014 | * needed for loading shared libraries. So the path better | |
1015 | * remains intact here. | |
1016 | */ | |
0fff78ff | 1017 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1018 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1019 | path = child_get_env(env, "PATH"); | |
1020 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1021 | if (path == NULL || *path == '\0') { | |
cdd66111 | 1022 | child_set_env(&env, &envsize, "PATH", |
0fff78ff | 1023 | s->pw->pw_uid == 0 ? |
1024 | SUPERUSER_PATH : _PATH_STDPATH); | |
1025 | } | |
3c0ef626 | 1026 | # endif /* HAVE_CYGWIN */ |
1027 | #endif /* HAVE_LOGIN_CAP */ | |
1028 | ||
1029 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1030 | _PATH_MAILDIR, pw->pw_name); | |
1031 | child_set_env(&env, &envsize, "MAIL", buf); | |
1032 | ||
1033 | /* Normal systems set SHELL by default. */ | |
1034 | child_set_env(&env, &envsize, "SHELL", shell); | |
1035 | } | |
1036 | if (getenv("TZ")) | |
1037 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1038 | ||
1039 | /* Set custom environment options from RSA authentication. */ | |
1040 | if (!options.use_login) { | |
1041 | while (custom_environment) { | |
1042 | struct envstring *ce = custom_environment; | |
41b2f314 | 1043 | char *str = ce->s; |
e9a17296 | 1044 | |
41b2f314 | 1045 | for (i = 0; str[i] != '=' && str[i]; i++) |
3c0ef626 | 1046 | ; |
41b2f314 | 1047 | if (str[i] == '=') { |
1048 | str[i] = 0; | |
1049 | child_set_env(&env, &envsize, str, str + i + 1); | |
3c0ef626 | 1050 | } |
1051 | custom_environment = ce->next; | |
1052 | xfree(ce->s); | |
1053 | xfree(ce); | |
1054 | } | |
1055 | } | |
1056 | ||
41b2f314 | 1057 | /* SSH_CLIENT deprecated */ |
3c0ef626 | 1058 | snprintf(buf, sizeof buf, "%.50s %d %d", |
e9a17296 | 1059 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
3c0ef626 | 1060 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1061 | ||
6a9b3198 | 1062 | laddr = get_local_ipaddr(packet_get_connection_in()); |
41b2f314 | 1063 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
6a9b3198 | 1064 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1065 | xfree(laddr); | |
41b2f314 | 1066 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1067 | ||
3c0ef626 | 1068 | if (s->ttyfd != -1) |
1069 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1070 | if (s->term) | |
1071 | child_set_env(&env, &envsize, "TERM", s->term); | |
1072 | if (s->display) | |
1073 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
1074 | if (original_command) | |
1075 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1076 | original_command); | |
1077 | ||
41b2f314 | 1078 | #ifdef _UNICOS |
1079 | if (cray_tmpdir[0] != '\0') | |
1080 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1081 | #endif /* _UNICOS */ | |
1082 | ||
3c0ef626 | 1083 | #ifdef _AIX |
e9a17296 | 1084 | { |
1085 | char *cp; | |
1086 | ||
1087 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1088 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1089 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1090 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1091 | read_environment_file(&env, &envsize, "/etc/environment"); | |
1092 | } | |
3c0ef626 | 1093 | #endif |
3c0ef626 | 1094 | #ifdef KRB5 |
99be0775 | 1095 | if (s->authctxt->krb5_ccname) |
3c0ef626 | 1096 | child_set_env(&env, &envsize, "KRB5CCNAME", |
99be0775 | 1097 | s->authctxt->krb5_ccname); |
3c0ef626 | 1098 | #endif |
1099 | #ifdef USE_PAM | |
41b2f314 | 1100 | /* |
1101 | * Pull in any environment variables that may have | |
1102 | * been set by PAM. | |
1103 | */ | |
0fff78ff | 1104 | if (options.use_pam) { |
cdd66111 | 1105 | char **p; |
41b2f314 | 1106 | |
cdd66111 | 1107 | p = fetch_pam_child_environment(); |
1108 | copy_environment(p, &env, &envsize); | |
1109 | free_pam_environment(p); | |
1110 | ||
1111 | p = fetch_pam_environment(); | |
41b2f314 | 1112 | copy_environment(p, &env, &envsize); |
1113 | free_pam_environment(p); | |
1114 | } | |
3c0ef626 | 1115 | #endif /* USE_PAM */ |
1116 | ||
f5799ae1 | 1117 | if (auth_sock_name != NULL) |
3c0ef626 | 1118 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
f5799ae1 | 1119 | auth_sock_name); |
3c0ef626 | 1120 | |
1121 | /* read $HOME/.ssh/environment. */ | |
41b2f314 | 1122 | if (options.permit_user_env && !options.use_login) { |
3c0ef626 | 1123 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
41b2f314 | 1124 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
3c0ef626 | 1125 | read_environment_file(&env, &envsize, buf); |
1126 | } | |
1127 | if (debug_flag) { | |
1128 | /* dump the environment */ | |
1129 | fprintf(stderr, "Environment:\n"); | |
1130 | for (i = 0; env[i]; i++) | |
1131 | fprintf(stderr, " %.200s\n", env[i]); | |
1132 | } | |
e9a17296 | 1133 | return env; |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1138 | * first in this order). | |
1139 | */ | |
1140 | static void | |
1141 | do_rc_files(Session *s, const char *shell) | |
1142 | { | |
1143 | FILE *f = NULL; | |
1144 | char cmd[1024]; | |
1145 | int do_xauth; | |
1146 | struct stat st; | |
1147 | ||
1148 | do_xauth = | |
1149 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1150 | ||
1151 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1152 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1153 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1154 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1155 | if (debug_flag) | |
1156 | fprintf(stderr, "Running %s\n", cmd); | |
1157 | f = popen(cmd, "w"); | |
1158 | if (f) { | |
1159 | if (do_xauth) | |
1160 | fprintf(f, "%s %s\n", s->auth_proto, | |
1161 | s->auth_data); | |
1162 | pclose(f); | |
1163 | } else | |
1164 | fprintf(stderr, "Could not run %s\n", | |
1165 | _PATH_SSH_USER_RC); | |
1166 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1167 | if (debug_flag) | |
1168 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1169 | _PATH_SSH_SYSTEM_RC); | |
1170 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1171 | if (f) { | |
1172 | if (do_xauth) | |
1173 | fprintf(f, "%s %s\n", s->auth_proto, | |
1174 | s->auth_data); | |
1175 | pclose(f); | |
1176 | } else | |
1177 | fprintf(stderr, "Could not run %s\n", | |
1178 | _PATH_SSH_SYSTEM_RC); | |
1179 | } else if (do_xauth && options.xauth_location != NULL) { | |
1180 | /* Add authority data to .Xauthority if appropriate. */ | |
1181 | if (debug_flag) { | |
1182 | fprintf(stderr, | |
6a9b3198 | 1183 | "Running %.500s remove %.100s\n", |
cdd66111 | 1184 | options.xauth_location, s->auth_display); |
6a9b3198 | 1185 | fprintf(stderr, |
1186 | "%.500s add %.100s %.100s %.100s\n", | |
e9a17296 | 1187 | options.xauth_location, s->auth_display, |
1188 | s->auth_proto, s->auth_data); | |
1189 | } | |
1190 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1191 | options.xauth_location); | |
1192 | f = popen(cmd, "w"); | |
1193 | if (f) { | |
6a9b3198 | 1194 | fprintf(f, "remove %s\n", |
1195 | s->auth_display); | |
e9a17296 | 1196 | fprintf(f, "add %s %s %s\n", |
1197 | s->auth_display, s->auth_proto, | |
1198 | s->auth_data); | |
1199 | pclose(f); | |
1200 | } else { | |
1201 | fprintf(stderr, "Could not run %s\n", | |
1202 | cmd); | |
1203 | } | |
1204 | } | |
1205 | } | |
1206 | ||
1207 | static void | |
1208 | do_nologin(struct passwd *pw) | |
1209 | { | |
1210 | FILE *f = NULL; | |
1211 | char buf[1024]; | |
1212 | ||
1213 | #ifdef HAVE_LOGIN_CAP | |
1214 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1215 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1216 | _PATH_NOLOGIN), "r"); | |
1217 | #else | |
1218 | if (pw->pw_uid) | |
1219 | f = fopen(_PATH_NOLOGIN, "r"); | |
1220 | #endif | |
1221 | if (f) { | |
1222 | /* /etc/nologin exists. Print its contents and exit. */ | |
0fff78ff | 1223 | logit("User %.100s not allowed because %s exists", |
41b2f314 | 1224 | pw->pw_name, _PATH_NOLOGIN); |
e9a17296 | 1225 | while (fgets(buf, sizeof(buf), f)) |
1226 | fputs(buf, stderr); | |
1227 | fclose(f); | |
6a9b3198 | 1228 | fflush(NULL); |
e9a17296 | 1229 | exit(254); |
1230 | } | |
1231 | } | |
1232 | ||
1233 | /* Set login name, uid, gid, and groups. */ | |
700318f3 | 1234 | void |
e9a17296 | 1235 | do_setusercontext(struct passwd *pw) |
1236 | { | |
6a9b3198 | 1237 | #ifndef HAVE_CYGWIN |
1238 | if (getuid() == 0 || geteuid() == 0) | |
e9a17296 | 1239 | #endif /* HAVE_CYGWIN */ |
6a9b3198 | 1240 | { |
1241 | ||
f5799ae1 | 1242 | #ifdef HAVE_SETPCRED |
0fff78ff | 1243 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1244 | fatal("Failed to set process credentials"); | |
f5799ae1 | 1245 | #endif /* HAVE_SETPCRED */ |
e9a17296 | 1246 | #ifdef HAVE_LOGIN_CAP |
41b2f314 | 1247 | # ifdef __bsdi__ |
680cee3b | 1248 | setpgid(0, 0); |
41b2f314 | 1249 | # endif |
cdd66111 | 1250 | # ifdef USE_PAM |
1251 | if (options.use_pam) { | |
1252 | do_pam_session(); | |
1253 | do_pam_setcred(0); | |
1254 | } | |
1255 | # endif /* USE_PAM */ | |
e9a17296 | 1256 | if (setusercontext(lc, pw, pw->pw_uid, |
1257 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1258 | perror("unable to set user context"); | |
1259 | exit(1); | |
1260 | } | |
1261 | #else | |
1262 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1263 | /* Sets login uid for accounting */ | |
1264 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1265 | error("setluid: %s", strerror(errno)); | |
1266 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1267 | ||
1268 | if (setlogin(pw->pw_name) < 0) | |
1269 | error("setlogin failed: %s", strerror(errno)); | |
1270 | if (setgid(pw->pw_gid) < 0) { | |
1271 | perror("setgid"); | |
1272 | exit(1); | |
1273 | } | |
1274 | /* Initialize the group list. */ | |
1275 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1276 | perror("initgroups"); | |
1277 | exit(1); | |
1278 | } | |
1279 | endgrent(); | |
1280 | # ifdef USE_PAM | |
1281 | /* | |
cdd66111 | 1282 | * PAM credentials may take the form of supplementary groups. |
e9a17296 | 1283 | * These will have been wiped by the above initgroups() call. |
1284 | * Reestablish them here. | |
1285 | */ | |
0fff78ff | 1286 | if (options.use_pam) { |
1287 | do_pam_session(); | |
1288 | do_pam_setcred(0); | |
1289 | } | |
e9a17296 | 1290 | # endif /* USE_PAM */ |
1291 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1292 | irix_setusercontext(pw); | |
1293 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
680cee3b | 1294 | # ifdef _AIX |
41b2f314 | 1295 | aix_usrinfo(pw); |
680cee3b | 1296 | # endif /* _AIX */ |
e9a17296 | 1297 | /* Permanently switch to the desired uid. */ |
1298 | permanently_set_uid(pw); | |
1299 | #endif | |
1300 | } | |
6a9b3198 | 1301 | |
1302 | #ifdef HAVE_CYGWIN | |
1303 | if (is_winnt) | |
1304 | #endif | |
e9a17296 | 1305 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1306 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1307 | } | |
1308 | ||
cdd66111 | 1309 | static void |
1310 | do_pwchange(Session *s) | |
1311 | { | |
c9f39d2c | 1312 | fflush(NULL); |
cdd66111 | 1313 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1314 | if (s->ttyfd != -1) { | |
c9f39d2c | 1315 | fprintf(stderr, |
cdd66111 | 1316 | "You must change your password now and login again!\n"); |
1317 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); | |
1318 | perror("passwd"); | |
1319 | } else { | |
1320 | fprintf(stderr, | |
1321 | "Password change required but no TTY available.\n"); | |
1322 | } | |
1323 | exit(1); | |
1324 | } | |
1325 | ||
700318f3 | 1326 | static void |
1327 | launch_login(struct passwd *pw, const char *hostname) | |
1328 | { | |
1329 | /* Launch login(1). */ | |
1330 | ||
f5799ae1 | 1331 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
700318f3 | 1332 | #ifdef xxxLOGIN_NEEDS_TERM |
f5799ae1 | 1333 | (s->term ? s->term : "unknown"), |
700318f3 | 1334 | #endif /* LOGIN_NEEDS_TERM */ |
1335 | #ifdef LOGIN_NO_ENDOPT | |
1336 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1337 | #else | |
1338 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1339 | #endif | |
1340 | ||
1341 | /* Login couldn't be executed, die. */ | |
1342 | ||
1343 | perror("login"); | |
1344 | exit(1); | |
1345 | } | |
1346 | ||
cdd66111 | 1347 | static void |
1348 | child_close_fds(void) | |
1349 | { | |
1350 | int i; | |
1351 | ||
1352 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1353 | close(packet_get_connection_in()); | |
1354 | else { | |
1355 | close(packet_get_connection_in()); | |
1356 | close(packet_get_connection_out()); | |
1357 | } | |
1358 | /* | |
1359 | * Close all descriptors related to channels. They will still remain | |
1360 | * open in the parent. | |
1361 | */ | |
1362 | /* XXX better use close-on-exec? -markus */ | |
1363 | channel_close_all(); | |
1364 | ||
1365 | /* | |
1366 | * Close any extra file descriptors. Note that there may still be | |
1367 | * descriptors left by system functions. They will be closed later. | |
1368 | */ | |
1369 | endpwent(); | |
1370 | ||
1371 | /* | |
1372 | * Close any extra open file descriptors so that we don\'t have them | |
1373 | * hanging around in clients. Note that we want to do this after | |
1374 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1375 | * descriptors open. | |
1376 | */ | |
1377 | for (i = 3; i < 64; i++) | |
1378 | close(i); | |
1379 | } | |
1380 | ||
e9a17296 | 1381 | /* |
1382 | * Performs common processing for the child, such as setting up the | |
1383 | * environment, closing extra file descriptors, setting the user and group | |
1384 | * ids, and executing the command or shell. | |
1385 | */ | |
1386 | void | |
1387 | do_child(Session *s, const char *command) | |
1388 | { | |
1389 | extern char **environ; | |
1390 | char **env; | |
1391 | char *argv[10]; | |
1392 | const char *shell, *shell0, *hostname = NULL; | |
1393 | struct passwd *pw = s->pw; | |
e9a17296 | 1394 | |
1395 | /* remove hostkey from the child's memory */ | |
1396 | destroy_sensitive_data(); | |
1397 | ||
cdd66111 | 1398 | /* Force a password change */ |
1399 | if (s->authctxt->force_pwchange) { | |
1400 | do_setusercontext(pw); | |
1401 | child_close_fds(); | |
1402 | do_pwchange(s); | |
1403 | exit(1); | |
1404 | } | |
1405 | ||
e9a17296 | 1406 | /* login(1) is only called if we execute the login shell */ |
1407 | if (options.use_login && command != NULL) | |
1408 | options.use_login = 0; | |
1409 | ||
41b2f314 | 1410 | #ifdef _UNICOS |
1411 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1412 | #endif /* _UNICOS */ | |
1413 | ||
e9a17296 | 1414 | /* |
1415 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1416 | * switch, so we let login(1) to this for us. | |
1417 | */ | |
1418 | if (!options.use_login) { | |
1419 | #ifdef HAVE_OSF_SIA | |
6a9b3198 | 1420 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
e9a17296 | 1421 | if (!check_quietlogin(s, command)) |
1422 | do_motd(); | |
1423 | #else /* HAVE_OSF_SIA */ | |
1424 | do_nologin(pw); | |
e9a17296 | 1425 | do_setusercontext(pw); |
c9f39d2c | 1426 | /* |
1427 | * PAM session modules in do_setusercontext may have | |
1428 | * generated messages, so if this in an interactive | |
1429 | * login then display them too. | |
1430 | */ | |
1431 | if (command == NULL) | |
1432 | display_loginmsg(); | |
e9a17296 | 1433 | #endif /* HAVE_OSF_SIA */ |
1434 | } | |
1435 | ||
1436 | /* | |
1437 | * Get the shell from the password data. An empty shell field is | |
1438 | * legal, and means /bin/sh. | |
1439 | */ | |
1440 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
6a9b3198 | 1441 | |
1442 | /* | |
1443 | * Make sure $SHELL points to the shell from the password file, | |
1444 | * even if shell is overridden from login.conf | |
1445 | */ | |
1446 | env = do_setup_env(s, shell); | |
1447 | ||
e9a17296 | 1448 | #ifdef HAVE_LOGIN_CAP |
1449 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1450 | #endif | |
1451 | ||
3c0ef626 | 1452 | /* we have to stash the hostname before we close our socket. */ |
1453 | if (options.use_login) | |
1454 | hostname = get_remote_name_or_ip(utmp_len, | |
0fff78ff | 1455 | options.use_dns); |
3c0ef626 | 1456 | /* |
1457 | * Close the connection descriptors; note that this is the child, and | |
1458 | * the server will still have the socket open, and it is important | |
1459 | * that we do not shutdown it. Note that the descriptors cannot be | |
1460 | * closed before building the environment, as we call | |
1461 | * get_remote_ipaddr there. | |
1462 | */ | |
cdd66111 | 1463 | child_close_fds(); |
3c0ef626 | 1464 | |
1465 | /* | |
cdd66111 | 1466 | * Must take new environment into use so that .ssh/rc, |
1467 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
3c0ef626 | 1468 | */ |
cdd66111 | 1469 | environ = env; |
3c0ef626 | 1470 | |
cdd66111 | 1471 | #if defined(KRB5) && defined(USE_AFS) |
3c0ef626 | 1472 | /* |
cdd66111 | 1473 | * At this point, we check to see if AFS is active and if we have |
1474 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1475 | * if we can (and need to) extend the ticket into an AFS token. If | |
1476 | * we don't do this, we run into potential problems if the user's | |
1477 | * home directory is in AFS and it's not world-readable. | |
3c0ef626 | 1478 | */ |
3c0ef626 | 1479 | |
cdd66111 | 1480 | if (options.kerberos_get_afs_token && k_hasafs() && |
1481 | (s->authctxt->krb5_ctx != NULL)) { | |
1482 | char cell[64]; | |
1483 | ||
1484 | debug("Getting AFS token"); | |
1485 | ||
1486 | k_setpag(); | |
1487 | ||
1488 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1489 | krb5_afslog(s->authctxt->krb5_ctx, | |
1490 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1491 | ||
1492 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1493 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1494 | } | |
1495 | #endif | |
3c0ef626 | 1496 | |
3c0ef626 | 1497 | /* Change current directory to the user\'s home directory. */ |
1498 | if (chdir(pw->pw_dir) < 0) { | |
1499 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1500 | pw->pw_dir, strerror(errno)); | |
1501 | #ifdef HAVE_LOGIN_CAP | |
1502 | if (login_getcapbool(lc, "requirehome", 0)) | |
1503 | exit(1); | |
1504 | #endif | |
1505 | } | |
1506 | ||
e9a17296 | 1507 | if (!options.use_login) |
1508 | do_rc_files(s, shell); | |
3c0ef626 | 1509 | |
1510 | /* restore SIGPIPE for child */ | |
1511 | signal(SIGPIPE, SIG_DFL); | |
1512 | ||
e9a17296 | 1513 | if (options.use_login) { |
700318f3 | 1514 | launch_login(pw, hostname); |
1515 | /* NEVERREACHED */ | |
e9a17296 | 1516 | } |
1517 | ||
1518 | /* Get the last component of the shell name. */ | |
1519 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1520 | shell0++; | |
1521 | else | |
1522 | shell0 = shell; | |
1523 | ||
3c0ef626 | 1524 | /* |
1525 | * If we have no command, execute the shell. In this case, the shell | |
1526 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1527 | * this is a login shell. | |
1528 | */ | |
1529 | if (!command) { | |
e9a17296 | 1530 | char argv0[256]; |
3c0ef626 | 1531 | |
e9a17296 | 1532 | /* Start the shell. Set initial character to '-'. */ |
1533 | argv0[0] = '-'; | |
3c0ef626 | 1534 | |
e9a17296 | 1535 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1536 | >= sizeof(argv0) - 1) { | |
1537 | errno = EINVAL; | |
3c0ef626 | 1538 | perror(shell); |
1539 | exit(1); | |
e9a17296 | 1540 | } |
3c0ef626 | 1541 | |
e9a17296 | 1542 | /* Execute the shell. */ |
1543 | argv[0] = argv0; | |
1544 | argv[1] = NULL; | |
1545 | execve(shell, argv, env); | |
3c0ef626 | 1546 | |
e9a17296 | 1547 | /* Executing the shell failed. */ |
1548 | perror(shell); | |
1549 | exit(1); | |
3c0ef626 | 1550 | } |
1551 | /* | |
1552 | * Execute the command using the user's shell. This uses the -c | |
1553 | * option to execute the command. | |
1554 | */ | |
e9a17296 | 1555 | argv[0] = (char *) shell0; |
3c0ef626 | 1556 | argv[1] = "-c"; |
1557 | argv[2] = (char *) command; | |
1558 | argv[3] = NULL; | |
1559 | execve(shell, argv, env); | |
1560 | perror(shell); | |
1561 | exit(1); | |
1562 | } | |
1563 | ||
1564 | Session * | |
1565 | session_new(void) | |
1566 | { | |
1567 | int i; | |
1568 | static int did_init = 0; | |
1569 | if (!did_init) { | |
1570 | debug("session_new: init"); | |
e9a17296 | 1571 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1572 | sessions[i].used = 0; |
1573 | } | |
1574 | did_init = 1; | |
1575 | } | |
e9a17296 | 1576 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1577 | Session *s = &sessions[i]; |
1578 | if (! s->used) { | |
1579 | memset(s, 0, sizeof(*s)); | |
1580 | s->chanid = -1; | |
1581 | s->ptyfd = -1; | |
1582 | s->ttyfd = -1; | |
1583 | s->used = 1; | |
1584 | s->self = i; | |
1585 | debug("session_new: session %d", i); | |
1586 | return s; | |
1587 | } | |
1588 | } | |
1589 | return NULL; | |
1590 | } | |
1591 | ||
1592 | static void | |
1593 | session_dump(void) | |
1594 | { | |
1595 | int i; | |
e9a17296 | 1596 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1597 | Session *s = &sessions[i]; |
f5799ae1 | 1598 | debug("dump: used %d session %d %p channel %d pid %ld", |
3c0ef626 | 1599 | s->used, |
1600 | s->self, | |
1601 | s, | |
1602 | s->chanid, | |
f5799ae1 | 1603 | (long)s->pid); |
3c0ef626 | 1604 | } |
1605 | } | |
1606 | ||
1607 | int | |
1608 | session_open(Authctxt *authctxt, int chanid) | |
1609 | { | |
1610 | Session *s = session_new(); | |
1611 | debug("session_open: channel %d", chanid); | |
1612 | if (s == NULL) { | |
1613 | error("no more sessions"); | |
1614 | return 0; | |
1615 | } | |
1616 | s->authctxt = authctxt; | |
1617 | s->pw = authctxt->pw; | |
cdd66111 | 1618 | if (s->pw == NULL || !authctxt->valid) |
3c0ef626 | 1619 | fatal("no user for session %d", s->self); |
1620 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1621 | s->chanid = chanid; | |
1622 | return 1; | |
1623 | } | |
1624 | ||
700318f3 | 1625 | Session * |
1626 | session_by_tty(char *tty) | |
1627 | { | |
1628 | int i; | |
1629 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1630 | Session *s = &sessions[i]; | |
1631 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1632 | debug("session_by_tty: session %d tty %s", i, tty); | |
1633 | return s; | |
1634 | } | |
1635 | } | |
1636 | debug("session_by_tty: unknown tty %.100s", tty); | |
1637 | session_dump(); | |
1638 | return NULL; | |
1639 | } | |
1640 | ||
3c0ef626 | 1641 | static Session * |
1642 | session_by_channel(int id) | |
1643 | { | |
1644 | int i; | |
e9a17296 | 1645 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1646 | Session *s = &sessions[i]; |
1647 | if (s->used && s->chanid == id) { | |
1648 | debug("session_by_channel: session %d channel %d", i, id); | |
1649 | return s; | |
1650 | } | |
1651 | } | |
1652 | debug("session_by_channel: unknown channel %d", id); | |
1653 | session_dump(); | |
1654 | return NULL; | |
1655 | } | |
1656 | ||
1657 | static Session * | |
1658 | session_by_pid(pid_t pid) | |
1659 | { | |
1660 | int i; | |
f5799ae1 | 1661 | debug("session_by_pid: pid %ld", (long)pid); |
e9a17296 | 1662 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1663 | Session *s = &sessions[i]; |
1664 | if (s->used && s->pid == pid) | |
1665 | return s; | |
1666 | } | |
f5799ae1 | 1667 | error("session_by_pid: unknown pid %ld", (long)pid); |
3c0ef626 | 1668 | session_dump(); |
1669 | return NULL; | |
1670 | } | |
1671 | ||
1672 | static int | |
1673 | session_window_change_req(Session *s) | |
1674 | { | |
1675 | s->col = packet_get_int(); | |
1676 | s->row = packet_get_int(); | |
1677 | s->xpixel = packet_get_int(); | |
1678 | s->ypixel = packet_get_int(); | |
e9a17296 | 1679 | packet_check_eom(); |
3c0ef626 | 1680 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1681 | return 1; | |
1682 | } | |
1683 | ||
1684 | static int | |
1685 | session_pty_req(Session *s) | |
1686 | { | |
1687 | u_int len; | |
1688 | int n_bytes; | |
1689 | ||
1690 | if (no_pty_flag) { | |
1691 | debug("Allocating a pty not permitted for this authentication."); | |
1692 | return 0; | |
1693 | } | |
1694 | if (s->ttyfd != -1) { | |
1695 | packet_disconnect("Protocol error: you already have a pty."); | |
1696 | return 0; | |
1697 | } | |
1698 | ||
1699 | s->term = packet_get_string(&len); | |
1700 | ||
1701 | if (compat20) { | |
1702 | s->col = packet_get_int(); | |
1703 | s->row = packet_get_int(); | |
1704 | } else { | |
1705 | s->row = packet_get_int(); | |
1706 | s->col = packet_get_int(); | |
1707 | } | |
1708 | s->xpixel = packet_get_int(); | |
1709 | s->ypixel = packet_get_int(); | |
1710 | ||
1711 | if (strcmp(s->term, "") == 0) { | |
1712 | xfree(s->term); | |
1713 | s->term = NULL; | |
1714 | } | |
1715 | ||
1716 | /* Allocate a pty and open it. */ | |
1717 | debug("Allocating pty."); | |
700318f3 | 1718 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
3c0ef626 | 1719 | if (s->term) |
1720 | xfree(s->term); | |
1721 | s->term = NULL; | |
1722 | s->ptyfd = -1; | |
1723 | s->ttyfd = -1; | |
1724 | error("session_pty_req: session %d alloc failed", s->self); | |
1725 | return 0; | |
1726 | } | |
1727 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1728 | ||
1729 | /* for SSH1 the tty modes length is not given */ | |
1730 | if (!compat20) | |
1731 | n_bytes = packet_remaining(); | |
1732 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1733 | ||
700318f3 | 1734 | if (!use_privsep) |
1735 | pty_setowner(s->pw, s->tty); | |
3c0ef626 | 1736 | |
1737 | /* Set window size from the packet. */ | |
1738 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1739 | ||
e9a17296 | 1740 | packet_check_eom(); |
3c0ef626 | 1741 | session_proctitle(s); |
1742 | return 1; | |
1743 | } | |
1744 | ||
1745 | static int | |
1746 | session_subsystem_req(Session *s) | |
1747 | { | |
1748 | struct stat st; | |
1749 | u_int len; | |
1750 | int success = 0; | |
1751 | char *cmd, *subsys = packet_get_string(&len); | |
1752 | int i; | |
1753 | ||
e9a17296 | 1754 | packet_check_eom(); |
0fff78ff | 1755 | logit("subsystem request for %.100s", subsys); |
3c0ef626 | 1756 | |
1757 | for (i = 0; i < options.num_subsystems; i++) { | |
1758 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1759 | cmd = options.subsystem_command[i]; | |
1760 | if (stat(cmd, &st) < 0) { | |
1761 | error("subsystem: cannot stat %s: %s", cmd, | |
1762 | strerror(errno)); | |
1763 | break; | |
1764 | } | |
1765 | debug("subsystem: exec() %s", cmd); | |
1766 | s->is_subsystem = 1; | |
1767 | do_exec(s, cmd); | |
1768 | success = 1; | |
e9a17296 | 1769 | break; |
3c0ef626 | 1770 | } |
1771 | } | |
1772 | ||
1773 | if (!success) | |
0fff78ff | 1774 | logit("subsystem request for %.100s failed, subsystem not found", |
3c0ef626 | 1775 | subsys); |
1776 | ||
1777 | xfree(subsys); | |
1778 | return success; | |
1779 | } | |
1780 | ||
1781 | static int | |
1782 | session_x11_req(Session *s) | |
1783 | { | |
1784 | int success; | |
1785 | ||
1786 | s->single_connection = packet_get_char(); | |
1787 | s->auth_proto = packet_get_string(NULL); | |
1788 | s->auth_data = packet_get_string(NULL); | |
1789 | s->screen = packet_get_int(); | |
e9a17296 | 1790 | packet_check_eom(); |
3c0ef626 | 1791 | |
1792 | success = session_setup_x11fwd(s); | |
1793 | if (!success) { | |
1794 | xfree(s->auth_proto); | |
1795 | xfree(s->auth_data); | |
1796 | s->auth_proto = NULL; | |
1797 | s->auth_data = NULL; | |
1798 | } | |
1799 | return success; | |
1800 | } | |
1801 | ||
1802 | static int | |
1803 | session_shell_req(Session *s) | |
1804 | { | |
e9a17296 | 1805 | packet_check_eom(); |
3c0ef626 | 1806 | do_exec(s, NULL); |
1807 | return 1; | |
1808 | } | |
1809 | ||
1810 | static int | |
1811 | session_exec_req(Session *s) | |
1812 | { | |
1813 | u_int len; | |
1814 | char *command = packet_get_string(&len); | |
e9a17296 | 1815 | packet_check_eom(); |
3c0ef626 | 1816 | do_exec(s, command); |
1817 | xfree(command); | |
1818 | return 1; | |
1819 | } | |
1820 | ||
0fff78ff | 1821 | static int |
1822 | session_break_req(Session *s) | |
1823 | { | |
0fff78ff | 1824 | |
c9f39d2c | 1825 | packet_get_int(); /* ignored */ |
0fff78ff | 1826 | packet_check_eom(); |
1827 | ||
1828 | if (s->ttyfd == -1 || | |
1829 | tcsendbreak(s->ttyfd, 0) < 0) | |
1830 | return 0; | |
1831 | return 1; | |
1832 | } | |
1833 | ||
c9f39d2c | 1834 | static int |
1835 | session_env_req(Session *s) | |
1836 | { | |
1837 | char *name, *val; | |
1838 | u_int name_len, val_len, i; | |
1839 | ||
1840 | name = packet_get_string(&name_len); | |
1841 | val = packet_get_string(&val_len); | |
1842 | packet_check_eom(); | |
1843 | ||
1844 | /* Don't set too many environment variables */ | |
1845 | if (s->num_env > 128) { | |
1846 | debug2("Ignoring env request %s: too many env vars", name); | |
1847 | goto fail; | |
1848 | } | |
1849 | ||
1850 | for (i = 0; i < options.num_accept_env; i++) { | |
1851 | if (match_pattern(name, options.accept_env[i])) { | |
1852 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
1853 | s->env = xrealloc(s->env, sizeof(*s->env) * | |
1854 | (s->num_env + 1)); | |
1855 | s->env[s->num_env].name = name; | |
1856 | s->env[s->num_env].val = val; | |
1857 | s->num_env++; | |
1858 | return (1); | |
1859 | } | |
1860 | } | |
1861 | debug2("Ignoring env request %s: disallowed name", name); | |
1862 | ||
1863 | fail: | |
1864 | xfree(name); | |
1865 | xfree(val); | |
1866 | return (0); | |
1867 | } | |
1868 | ||
3c0ef626 | 1869 | static int |
1870 | session_auth_agent_req(Session *s) | |
1871 | { | |
1872 | static int called = 0; | |
e9a17296 | 1873 | packet_check_eom(); |
3c0ef626 | 1874 | if (no_agent_forwarding_flag) { |
1875 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1876 | return 0; | |
1877 | } | |
1878 | if (called) { | |
1879 | return 0; | |
1880 | } else { | |
1881 | called = 1; | |
1882 | return auth_input_request_forwarding(s->pw); | |
1883 | } | |
1884 | } | |
1885 | ||
e9a17296 | 1886 | int |
1887 | session_input_channel_req(Channel *c, const char *rtype) | |
3c0ef626 | 1888 | { |
3c0ef626 | 1889 | int success = 0; |
3c0ef626 | 1890 | Session *s; |
3c0ef626 | 1891 | |
e9a17296 | 1892 | if ((s = session_by_channel(c->self)) == NULL) { |
0fff78ff | 1893 | logit("session_input_channel_req: no session %d req %.100s", |
e9a17296 | 1894 | c->self, rtype); |
1895 | return 0; | |
1896 | } | |
1897 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
3c0ef626 | 1898 | |
1899 | /* | |
1900 | * a session is in LARVAL state until a shell, a command | |
1901 | * or a subsystem is executed | |
1902 | */ | |
1903 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1904 | if (strcmp(rtype, "shell") == 0) { | |
1905 | success = session_shell_req(s); | |
1906 | } else if (strcmp(rtype, "exec") == 0) { | |
1907 | success = session_exec_req(s); | |
1908 | } else if (strcmp(rtype, "pty-req") == 0) { | |
1909 | success = session_pty_req(s); | |
1910 | } else if (strcmp(rtype, "x11-req") == 0) { | |
1911 | success = session_x11_req(s); | |
1912 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { | |
1913 | success = session_auth_agent_req(s); | |
1914 | } else if (strcmp(rtype, "subsystem") == 0) { | |
1915 | success = session_subsystem_req(s); | |
c9f39d2c | 1916 | } else if (strcmp(rtype, "env") == 0) { |
1917 | success = session_env_req(s); | |
3c0ef626 | 1918 | } |
1919 | } | |
1920 | if (strcmp(rtype, "window-change") == 0) { | |
1921 | success = session_window_change_req(s); | |
c9f39d2c | 1922 | } else if (strcmp(rtype, "break") == 0) { |
1923 | success = session_break_req(s); | |
3c0ef626 | 1924 | } |
c9f39d2c | 1925 | |
e9a17296 | 1926 | return success; |
3c0ef626 | 1927 | } |
1928 | ||
1929 | void | |
1930 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1931 | { | |
1932 | if (!compat20) | |
1933 | fatal("session_set_fds: called for proto != 2.0"); | |
1934 | /* | |
1935 | * now that have a child and a pipe to the child, | |
1936 | * we can activate our channel and register the fd's | |
1937 | */ | |
1938 | if (s->chanid == -1) | |
1939 | fatal("no channel for session %d", s->self); | |
1940 | channel_set_fds(s->chanid, | |
1941 | fdout, fdin, fderr, | |
1942 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
e9a17296 | 1943 | 1, |
1944 | CHAN_SES_WINDOW_DEFAULT); | |
3c0ef626 | 1945 | } |
1946 | ||
1947 | /* | |
1948 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
1949 | * (e.g., due to a dropped connection). | |
1950 | */ | |
700318f3 | 1951 | void |
cdd66111 | 1952 | session_pty_cleanup2(Session *s) |
3c0ef626 | 1953 | { |
3c0ef626 | 1954 | if (s == NULL) { |
1955 | error("session_pty_cleanup: no session"); | |
1956 | return; | |
1957 | } | |
1958 | if (s->ttyfd == -1) | |
1959 | return; | |
1960 | ||
1961 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); | |
1962 | ||
1963 | /* Record that the user has logged out. */ | |
1964 | if (s->pid != 0) | |
e9a17296 | 1965 | record_logout(s->pid, s->tty, s->pw->pw_name); |
3c0ef626 | 1966 | |
1967 | /* Release the pseudo-tty. */ | |
700318f3 | 1968 | if (getuid() == 0) |
1969 | pty_release(s->tty); | |
3c0ef626 | 1970 | |
1971 | /* | |
1972 | * Close the server side of the socket pairs. We must do this after | |
1973 | * the pty cleanup, so that another process doesn't get this pty | |
1974 | * while we're still cleaning up. | |
1975 | */ | |
1976 | if (close(s->ptymaster) < 0) | |
700318f3 | 1977 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
3c0ef626 | 1978 | |
1979 | /* unlink pty from session */ | |
1980 | s->ttyfd = -1; | |
1981 | } | |
1982 | ||
700318f3 | 1983 | void |
cdd66111 | 1984 | session_pty_cleanup(Session *s) |
700318f3 | 1985 | { |
cdd66111 | 1986 | PRIVSEP(session_pty_cleanup2(s)); |
700318f3 | 1987 | } |
1988 | ||
41b2f314 | 1989 | static char * |
1990 | sig2name(int sig) | |
1991 | { | |
1992 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
1993 | SSH_SIG(ABRT); | |
1994 | SSH_SIG(ALRM); | |
1995 | SSH_SIG(FPE); | |
1996 | SSH_SIG(HUP); | |
1997 | SSH_SIG(ILL); | |
1998 | SSH_SIG(INT); | |
1999 | SSH_SIG(KILL); | |
2000 | SSH_SIG(PIPE); | |
2001 | SSH_SIG(QUIT); | |
2002 | SSH_SIG(SEGV); | |
2003 | SSH_SIG(TERM); | |
2004 | SSH_SIG(USR1); | |
2005 | SSH_SIG(USR2); | |
2006 | #undef SSH_SIG | |
2007 | return "SIG@openssh.com"; | |
2008 | } | |
2009 | ||
3c0ef626 | 2010 | static void |
2011 | session_exit_message(Session *s, int status) | |
2012 | { | |
2013 | Channel *c; | |
e9a17296 | 2014 | |
2015 | if ((c = channel_lookup(s->chanid)) == NULL) | |
3c0ef626 | 2016 | fatal("session_exit_message: session %d: no channel %d", |
2017 | s->self, s->chanid); | |
f5799ae1 | 2018 | debug("session_exit_message: session %d channel %d pid %ld", |
2019 | s->self, s->chanid, (long)s->pid); | |
3c0ef626 | 2020 | |
2021 | if (WIFEXITED(status)) { | |
e9a17296 | 2022 | channel_request_start(s->chanid, "exit-status", 0); |
3c0ef626 | 2023 | packet_put_int(WEXITSTATUS(status)); |
2024 | packet_send(); | |
2025 | } else if (WIFSIGNALED(status)) { | |
e9a17296 | 2026 | channel_request_start(s->chanid, "exit-signal", 0); |
41b2f314 | 2027 | packet_put_cstring(sig2name(WTERMSIG(status))); |
3c0ef626 | 2028 | #ifdef WCOREDUMP |
2029 | packet_put_char(WCOREDUMP(status)); | |
2030 | #else /* WCOREDUMP */ | |
2031 | packet_put_char(0); | |
2032 | #endif /* WCOREDUMP */ | |
2033 | packet_put_cstring(""); | |
2034 | packet_put_cstring(""); | |
2035 | packet_send(); | |
2036 | } else { | |
2037 | /* Some weird exit cause. Just exit. */ | |
2038 | packet_disconnect("wait returned status %04x.", status); | |
2039 | } | |
2040 | ||
2041 | /* disconnect channel */ | |
2042 | debug("session_exit_message: release channel %d", s->chanid); | |
2043 | channel_cancel_cleanup(s->chanid); | |
2044 | /* | |
2045 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2046 | * interested in data we write. | |
2047 | * Note that we must not call 'chan_read_failed', since there could | |
2048 | * be some more data waiting in the pipe. | |
2049 | */ | |
2050 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2051 | chan_write_failed(c); | |
2052 | s->chanid = -1; | |
2053 | } | |
2054 | ||
700318f3 | 2055 | void |
3c0ef626 | 2056 | session_close(Session *s) |
2057 | { | |
c9f39d2c | 2058 | int i; |
2059 | ||
f5799ae1 | 2060 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
cdd66111 | 2061 | if (s->ttyfd != -1) |
3c0ef626 | 2062 | session_pty_cleanup(s); |
3c0ef626 | 2063 | if (s->term) |
2064 | xfree(s->term); | |
2065 | if (s->display) | |
2066 | xfree(s->display); | |
e9a17296 | 2067 | if (s->auth_display) |
2068 | xfree(s->auth_display); | |
3c0ef626 | 2069 | if (s->auth_data) |
2070 | xfree(s->auth_data); | |
2071 | if (s->auth_proto) | |
2072 | xfree(s->auth_proto); | |
2073 | s->used = 0; | |
c9f39d2c | 2074 | for (i = 0; i < s->num_env; i++) { |
2075 | xfree(s->env[i].name); | |
2076 | xfree(s->env[i].val); | |
2077 | } | |
2078 | if (s->env != NULL) | |
2079 | xfree(s->env); | |
3c0ef626 | 2080 | session_proctitle(s); |
2081 | } | |
2082 | ||
2083 | void | |
2084 | session_close_by_pid(pid_t pid, int status) | |
2085 | { | |
2086 | Session *s = session_by_pid(pid); | |
2087 | if (s == NULL) { | |
f5799ae1 | 2088 | debug("session_close_by_pid: no session for pid %ld", |
2089 | (long)pid); | |
3c0ef626 | 2090 | return; |
2091 | } | |
2092 | if (s->chanid != -1) | |
2093 | session_exit_message(s, status); | |
2094 | session_close(s); | |
2095 | } | |
2096 | ||
2097 | /* | |
2098 | * this is called when a channel dies before | |
2099 | * the session 'child' itself dies | |
2100 | */ | |
2101 | void | |
2102 | session_close_by_channel(int id, void *arg) | |
2103 | { | |
2104 | Session *s = session_by_channel(id); | |
2105 | if (s == NULL) { | |
2106 | debug("session_close_by_channel: no session for id %d", id); | |
2107 | return; | |
2108 | } | |
f5799ae1 | 2109 | debug("session_close_by_channel: channel %d child %ld", |
2110 | id, (long)s->pid); | |
3c0ef626 | 2111 | if (s->pid != 0) { |
2112 | debug("session_close_by_channel: channel %d: has child", id); | |
2113 | /* | |
2114 | * delay detach of session, but release pty, since | |
2115 | * the fd's to the child are already closed | |
2116 | */ | |
cdd66111 | 2117 | if (s->ttyfd != -1) |
3c0ef626 | 2118 | session_pty_cleanup(s); |
3c0ef626 | 2119 | return; |
2120 | } | |
2121 | /* detach by removing callback */ | |
2122 | channel_cancel_cleanup(s->chanid); | |
2123 | s->chanid = -1; | |
2124 | session_close(s); | |
2125 | } | |
2126 | ||
2127 | void | |
700318f3 | 2128 | session_destroy_all(void (*closefunc)(Session *)) |
3c0ef626 | 2129 | { |
2130 | int i; | |
e9a17296 | 2131 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2132 | Session *s = &sessions[i]; |
700318f3 | 2133 | if (s->used) { |
2134 | if (closefunc != NULL) | |
2135 | closefunc(s); | |
2136 | else | |
2137 | session_close(s); | |
2138 | } | |
3c0ef626 | 2139 | } |
2140 | } | |
2141 | ||
2142 | static char * | |
2143 | session_tty_list(void) | |
2144 | { | |
2145 | static char buf[1024]; | |
2146 | int i; | |
6a9b3198 | 2147 | char *cp; |
2148 | ||
3c0ef626 | 2149 | buf[0] = '\0'; |
e9a17296 | 2150 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2151 | Session *s = &sessions[i]; |
2152 | if (s->used && s->ttyfd != -1) { | |
cdd66111 | 2153 | |
6a9b3198 | 2154 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2155 | cp = strrchr(s->tty, '/'); | |
2156 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2157 | } else | |
2158 | cp = s->tty + 5; | |
cdd66111 | 2159 | |
3c0ef626 | 2160 | if (buf[0] != '\0') |
2161 | strlcat(buf, ",", sizeof buf); | |
6a9b3198 | 2162 | strlcat(buf, cp, sizeof buf); |
3c0ef626 | 2163 | } |
2164 | } | |
2165 | if (buf[0] == '\0') | |
2166 | strlcpy(buf, "notty", sizeof buf); | |
2167 | return buf; | |
2168 | } | |
2169 | ||
2170 | void | |
2171 | session_proctitle(Session *s) | |
2172 | { | |
2173 | if (s->pw == NULL) | |
2174 | error("no user for session %d", s->self); | |
2175 | else | |
2176 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2177 | } | |
2178 | ||
2179 | int | |
2180 | session_setup_x11fwd(Session *s) | |
2181 | { | |
2182 | struct stat st; | |
e9a17296 | 2183 | char display[512], auth_display[512]; |
2184 | char hostname[MAXHOSTNAMELEN]; | |
3c0ef626 | 2185 | |
2186 | if (no_x11_forwarding_flag) { | |
2187 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2188 | return 0; | |
2189 | } | |
2190 | if (!options.x11_forwarding) { | |
2191 | debug("X11 forwarding disabled in server configuration file."); | |
2192 | return 0; | |
2193 | } | |
2194 | if (!options.xauth_location || | |
2195 | (stat(options.xauth_location, &st) == -1)) { | |
2196 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2197 | return 0; | |
2198 | } | |
2199 | if (options.use_login) { | |
2200 | packet_send_debug("X11 forwarding disabled; " | |
2201 | "not compatible with UseLogin=yes."); | |
2202 | return 0; | |
2203 | } | |
2204 | if (s->display != NULL) { | |
2205 | debug("X11 display already set."); | |
2206 | return 0; | |
2207 | } | |
680cee3b | 2208 | if (x11_create_display_inet(options.x11_display_offset, |
2209 | options.x11_use_localhost, s->single_connection, | |
2210 | &s->display_number) == -1) { | |
3c0ef626 | 2211 | debug("x11_create_display_inet failed."); |
2212 | return 0; | |
2213 | } | |
e9a17296 | 2214 | |
2215 | /* Set up a suitable value for the DISPLAY variable. */ | |
2216 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2217 | fatal("gethostname: %.100s", strerror(errno)); | |
2218 | /* | |
2219 | * auth_display must be used as the displayname when the | |
2220 | * authorization entry is added with xauth(1). This will be | |
2221 | * different than the DISPLAY string for localhost displays. | |
2222 | */ | |
2223 | if (options.x11_use_localhost) { | |
680cee3b | 2224 | snprintf(display, sizeof display, "localhost:%u.%u", |
e9a17296 | 2225 | s->display_number, s->screen); |
680cee3b | 2226 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
e9a17296 | 2227 | s->display_number, s->screen); |
2228 | s->display = xstrdup(display); | |
2229 | s->auth_display = xstrdup(auth_display); | |
2230 | } else { | |
2231 | #ifdef IPADDR_IN_DISPLAY | |
2232 | struct hostent *he; | |
2233 | struct in_addr my_addr; | |
2234 | ||
2235 | he = gethostbyname(hostname); | |
2236 | if (he == NULL) { | |
2237 | error("Can't get IP address for X11 DISPLAY."); | |
2238 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2239 | return 0; | |
2240 | } | |
2241 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
680cee3b | 2242 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
e9a17296 | 2243 | s->display_number, s->screen); |
2244 | #else | |
680cee3b | 2245 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
e9a17296 | 2246 | s->display_number, s->screen); |
2247 | #endif | |
2248 | s->display = xstrdup(display); | |
2249 | s->auth_display = xstrdup(display); | |
2250 | } | |
2251 | ||
3c0ef626 | 2252 | return 1; |
2253 | } | |
2254 | ||
2255 | static void | |
2256 | do_authenticated2(Authctxt *authctxt) | |
2257 | { | |
2258 | server_loop2(authctxt); | |
cdd66111 | 2259 | } |
2260 | ||
2261 | void | |
2262 | do_cleanup(Authctxt *authctxt) | |
2263 | { | |
2264 | static int called = 0; | |
2265 | ||
2266 | debug("do_cleanup"); | |
2267 | ||
2268 | /* no cleanup if we're in the child for login shell */ | |
2269 | if (is_child) | |
2270 | return; | |
2271 | ||
2272 | /* avoid double cleanup */ | |
2273 | if (called) | |
2274 | return; | |
2275 | called = 1; | |
2276 | ||
2277 | if (authctxt == NULL) | |
2278 | return; | |
2279 | #ifdef KRB5 | |
2280 | if (options.kerberos_ticket_cleanup && | |
2281 | authctxt->krb5_ctx) | |
2282 | krb5_cleanup_proc(authctxt); | |
0fff78ff | 2283 | #endif |
cdd66111 | 2284 | |
2285 | #ifdef GSSAPI | |
2286 | if (compat20 && options.gss_cleanup_creds) | |
2287 | ssh_gssapi_cleanup_creds(); | |
2288 | #endif | |
2289 | ||
2290 | #ifdef USE_PAM | |
2291 | if (options.use_pam) { | |
2292 | sshpam_cleanup(); | |
2293 | sshpam_thread_cleanup(); | |
2294 | } | |
2295 | #endif | |
2296 | ||
2297 | /* remove agent socket */ | |
2298 | auth_sock_cleanup_proc(authctxt->pw); | |
2299 | ||
2300 | /* | |
2301 | * Cleanup ptys/utmp only if privsep is disabled, | |
2302 | * or if running in monitor. | |
2303 | */ | |
2304 | if (!use_privsep || mm_is_monitor()) | |
2305 | session_destroy_all(session_pty_cleanup2); | |
3c0ef626 | 2306 | } |