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7368a6c8 | 1 | /* |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
4 | */ | |
e78a59f5 | 5 | /* |
6 | * SSH2 support by Markus Friedl. | |
7 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
8 | */ | |
7368a6c8 | 9 | |
10 | #include "includes.h" | |
38c295d6 | 11 | RCSID("$OpenBSD: session.c,v 1.20 2000/06/18 04:42:54 markus Exp $"); |
5fa45897 | 12 | #if defined(HAVE_USERSEC_H) |
13 | #include <usersec.h> | |
14 | #endif | |
7368a6c8 | 15 | |
16 | #include "xmalloc.h" | |
17 | #include "ssh.h" | |
18 | #include "pty.h" | |
19 | #include "packet.h" | |
20 | #include "buffer.h" | |
21 | #include "cipher.h" | |
22 | #include "mpaux.h" | |
23 | #include "servconf.h" | |
24 | #include "uidswap.h" | |
25 | #include "compat.h" | |
26 | #include "channels.h" | |
27 | #include "nchan.h" | |
28 | ||
e78a59f5 | 29 | #include "bufaux.h" |
30 | #include "ssh2.h" | |
31 | #include "auth.h" | |
38c295d6 | 32 | #include "auth-options.h" |
e78a59f5 | 33 | |
3206bb3b | 34 | #ifdef WITH_IRIX_PROJECT |
35 | #include <proj.h> | |
36 | #endif /* WITH_IRIX_PROJECT */ | |
37 | ||
4d33e531 | 38 | #ifdef HAVE_OSF_SIA |
39 | # include <sia.h> | |
40 | # include <siad.h> | |
41 | #endif | |
42 | ||
7368a6c8 | 43 | /* types */ |
44 | ||
45 | #define TTYSZ 64 | |
46 | typedef struct Session Session; | |
47 | struct Session { | |
48 | int used; | |
49 | int self; | |
0b242b12 | 50 | int extended; |
7368a6c8 | 51 | struct passwd *pw; |
52 | pid_t pid; | |
53 | /* tty */ | |
54 | char *term; | |
55 | int ptyfd, ttyfd, ptymaster; | |
56 | int row, col, xpixel, ypixel; | |
57 | char tty[TTYSZ]; | |
58 | /* X11 */ | |
59 | char *display; | |
60 | int screen; | |
61 | char *auth_proto; | |
62 | char *auth_data; | |
0b242b12 | 63 | int single_connection; |
7368a6c8 | 64 | /* proto 2 */ |
65 | int chanid; | |
66 | }; | |
67 | ||
68 | /* func */ | |
69 | ||
70 | Session *session_new(void); | |
71 | void session_set_fds(Session *s, int fdin, int fdout, int fderr); | |
72 | void session_pty_cleanup(Session *s); | |
1d1ffb87 | 73 | void session_proctitle(Session *s); |
7368a6c8 | 74 | void do_exec_pty(Session *s, const char *command, struct passwd * pw); |
75 | void do_exec_no_pty(Session *s, const char *command, struct passwd * pw); | |
76 | ||
77 | void | |
78 | do_child(const char *command, struct passwd * pw, const char *term, | |
79 | const char *display, const char *auth_proto, | |
80 | const char *auth_data, const char *ttyname); | |
81 | ||
82 | /* import */ | |
83 | extern ServerOptions options; | |
3a6cb538 | 84 | #ifdef HAVE___PROGNAME |
7368a6c8 | 85 | extern char *__progname; |
3a6cb538 | 86 | #else /* HAVE___PROGNAME */ |
3fd95d9a | 87 | static const char *__progname = "sshd"; |
3a6cb538 | 88 | #endif /* HAVE___PROGNAME */ |
89 | ||
7368a6c8 | 90 | extern int log_stderr; |
91 | extern int debug_flag; | |
92 | ||
93 | /* Local Xauthority file. */ | |
94 | static char *xauthfile; | |
95 | ||
96 | /* data */ | |
97 | #define MAX_SESSIONS 10 | |
98 | Session sessions[MAX_SESSIONS]; | |
c1ef8333 | 99 | #ifdef WITH_AIXAUTHENTICATE |
100 | /* AIX's lastlogin message, set in auth1.c */ | |
101 | char *aixloginmsg; | |
102 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 103 | |
7368a6c8 | 104 | /* |
105 | * Remove local Xauthority file. | |
106 | */ | |
107 | void | |
108 | xauthfile_cleanup_proc(void *ignore) | |
109 | { | |
110 | debug("xauthfile_cleanup_proc called"); | |
111 | ||
112 | if (xauthfile != NULL) { | |
113 | char *p; | |
114 | unlink(xauthfile); | |
115 | p = strrchr(xauthfile, '/'); | |
116 | if (p != NULL) { | |
117 | *p = '\0'; | |
118 | rmdir(xauthfile); | |
119 | } | |
120 | xfree(xauthfile); | |
121 | xauthfile = NULL; | |
122 | } | |
123 | } | |
124 | ||
125 | /* | |
126 | * Function to perform cleanup if we get aborted abnormally (e.g., due to a | |
127 | * dropped connection). | |
128 | */ | |
6ae2364d | 129 | void |
7368a6c8 | 130 | pty_cleanup_proc(void *session) |
131 | { | |
132 | Session *s=session; | |
133 | if (s == NULL) | |
134 | fatal("pty_cleanup_proc: no session"); | |
135 | debug("pty_cleanup_proc: %s", s->tty); | |
136 | ||
137 | if (s->pid != 0) { | |
138 | /* Record that the user has logged out. */ | |
139 | record_logout(s->pid, s->tty); | |
140 | } | |
141 | ||
142 | /* Release the pseudo-tty. */ | |
143 | pty_release(s->tty); | |
144 | } | |
145 | ||
146 | /* | |
147 | * Prepares for an interactive session. This is called after the user has | |
148 | * been successfully authenticated. During this message exchange, pseudo | |
149 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
150 | * are requested, etc. | |
151 | */ | |
6ae2364d | 152 | void |
7368a6c8 | 153 | do_authenticated(struct passwd * pw) |
154 | { | |
155 | Session *s; | |
156 | int type; | |
157 | int compression_level = 0, enable_compression_after_reply = 0; | |
158 | int have_pty = 0; | |
159 | char *command; | |
160 | int n_bytes; | |
161 | int plen; | |
162 | unsigned int proto_len, data_len, dlen; | |
163 | ||
164 | /* | |
165 | * Cancel the alarm we set to limit the time taken for | |
166 | * authentication. | |
167 | */ | |
168 | alarm(0); | |
169 | ||
170 | /* | |
171 | * Inform the channel mechanism that we are the server side and that | |
172 | * the client may request to connect to any port at all. (The user | |
173 | * could do it anyway, and we wouldn\'t know what is permitted except | |
174 | * by the client telling us, so we can equally well trust the client | |
175 | * not to request anything bogus.) | |
176 | */ | |
177 | if (!no_port_forwarding_flag) | |
178 | channel_permit_all_opens(); | |
179 | ||
180 | s = session_new(); | |
0b242b12 | 181 | s->pw = pw; |
7368a6c8 | 182 | |
183 | /* | |
184 | * We stay in this loop until the client requests to execute a shell | |
185 | * or a command. | |
186 | */ | |
187 | for (;;) { | |
188 | int success = 0; | |
189 | ||
190 | /* Get a packet from the client. */ | |
191 | type = packet_read(&plen); | |
192 | ||
193 | /* Process the packet. */ | |
194 | switch (type) { | |
195 | case SSH_CMSG_REQUEST_COMPRESSION: | |
196 | packet_integrity_check(plen, 4, type); | |
197 | compression_level = packet_get_int(); | |
198 | if (compression_level < 1 || compression_level > 9) { | |
199 | packet_send_debug("Received illegal compression level %d.", | |
200 | compression_level); | |
201 | break; | |
202 | } | |
203 | /* Enable compression after we have responded with SUCCESS. */ | |
204 | enable_compression_after_reply = 1; | |
205 | success = 1; | |
206 | break; | |
207 | ||
208 | case SSH_CMSG_REQUEST_PTY: | |
209 | if (no_pty_flag) { | |
210 | debug("Allocating a pty not permitted for this authentication."); | |
211 | break; | |
212 | } | |
213 | if (have_pty) | |
214 | packet_disconnect("Protocol error: you already have a pty."); | |
215 | ||
216 | debug("Allocating pty."); | |
217 | ||
218 | /* Allocate a pty and open it. */ | |
219 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, | |
220 | sizeof(s->tty))) { | |
221 | error("Failed to allocate pty."); | |
222 | break; | |
223 | } | |
224 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
225 | pty_setowner(pw, s->tty); | |
226 | ||
227 | /* Get TERM from the packet. Note that the value may be of arbitrary length. */ | |
228 | s->term = packet_get_string(&dlen); | |
229 | packet_integrity_check(dlen, strlen(s->term), type); | |
230 | /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */ | |
231 | /* Remaining bytes */ | |
232 | n_bytes = plen - (4 + dlen + 4 * 4); | |
233 | ||
234 | if (strcmp(s->term, "") == 0) { | |
235 | xfree(s->term); | |
236 | s->term = NULL; | |
237 | } | |
238 | /* Get window size from the packet. */ | |
239 | s->row = packet_get_int(); | |
240 | s->col = packet_get_int(); | |
241 | s->xpixel = packet_get_int(); | |
242 | s->ypixel = packet_get_int(); | |
243 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
244 | ||
245 | /* Get tty modes from the packet. */ | |
246 | tty_parse_modes(s->ttyfd, &n_bytes); | |
247 | packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type); | |
248 | ||
1d1ffb87 | 249 | session_proctitle(s); |
250 | ||
7368a6c8 | 251 | /* Indicate that we now have a pty. */ |
252 | success = 1; | |
253 | have_pty = 1; | |
254 | break; | |
255 | ||
256 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
257 | if (!options.x11_forwarding) { | |
258 | packet_send_debug("X11 forwarding disabled in server configuration file."); | |
259 | break; | |
260 | } | |
6fc1e9f3 | 261 | if (!options.xauth_location) { |
262 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
263 | break; | |
264 | } | |
7368a6c8 | 265 | if (no_x11_forwarding_flag) { |
266 | packet_send_debug("X11 forwarding not permitted for this authentication."); | |
267 | break; | |
268 | } | |
269 | debug("Received request for X11 forwarding with auth spoofing."); | |
270 | if (s->display != NULL) | |
271 | packet_disconnect("Protocol error: X11 display already set."); | |
272 | ||
273 | s->auth_proto = packet_get_string(&proto_len); | |
274 | s->auth_data = packet_get_string(&data_len); | |
275 | packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type); | |
276 | ||
277 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER) | |
278 | s->screen = packet_get_int(); | |
279 | else | |
280 | s->screen = 0; | |
281 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
282 | ||
283 | if (s->display == NULL) | |
284 | break; | |
285 | ||
286 | /* Setup to always have a local .Xauthority. */ | |
287 | xauthfile = xmalloc(MAXPATHLEN); | |
288 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
289 | temporarily_use_uid(pw->pw_uid); | |
290 | if (mkdtemp(xauthfile) == NULL) { | |
291 | restore_uid(); | |
292 | error("private X11 dir: mkdtemp %s failed: %s", | |
293 | xauthfile, strerror(errno)); | |
294 | xfree(xauthfile); | |
295 | xauthfile = NULL; | |
0b242b12 | 296 | /* XXXX remove listening channels */ |
7368a6c8 | 297 | break; |
298 | } | |
299 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
300 | open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); | |
301 | restore_uid(); | |
302 | fatal_add_cleanup(xauthfile_cleanup_proc, NULL); | |
303 | success = 1; | |
304 | break; | |
7368a6c8 | 305 | |
306 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
307 | if (no_agent_forwarding_flag || compat13) { | |
308 | debug("Authentication agent forwarding not permitted for this authentication."); | |
309 | break; | |
310 | } | |
311 | debug("Received authentication agent forwarding request."); | |
6fc1e9f3 | 312 | success = auth_input_request_forwarding(pw); |
7368a6c8 | 313 | break; |
314 | ||
315 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
316 | if (no_port_forwarding_flag) { | |
317 | debug("Port forwarding not permitted for this authentication."); | |
318 | break; | |
319 | } | |
320 | debug("Received TCP/IP port forwarding request."); | |
1d1ffb87 | 321 | channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 322 | success = 1; |
323 | break; | |
324 | ||
325 | case SSH_CMSG_MAX_PACKET_SIZE: | |
326 | if (packet_set_maxsize(packet_get_int()) > 0) | |
327 | success = 1; | |
328 | break; | |
329 | ||
330 | case SSH_CMSG_EXEC_SHELL: | |
331 | case SSH_CMSG_EXEC_CMD: | |
332 | /* Set interactive/non-interactive mode. */ | |
333 | packet_set_interactive(have_pty || s->display != NULL, | |
334 | options.keepalives); | |
335 | ||
336 | if (type == SSH_CMSG_EXEC_CMD) { | |
337 | command = packet_get_string(&dlen); | |
338 | debug("Exec command '%.500s'", command); | |
339 | packet_integrity_check(plen, 4 + dlen, type); | |
340 | } else { | |
341 | command = NULL; | |
342 | packet_integrity_check(plen, 0, type); | |
343 | } | |
344 | if (forced_command != NULL) { | |
345 | command = forced_command; | |
346 | debug("Forced command '%.500s'", forced_command); | |
347 | } | |
348 | if (have_pty) | |
349 | do_exec_pty(s, command, pw); | |
350 | else | |
351 | do_exec_no_pty(s, command, pw); | |
352 | ||
353 | if (command != NULL) | |
354 | xfree(command); | |
355 | /* Cleanup user's local Xauthority file. */ | |
356 | if (xauthfile) | |
357 | xauthfile_cleanup_proc(NULL); | |
358 | return; | |
359 | ||
360 | default: | |
361 | /* | |
362 | * Any unknown messages in this phase are ignored, | |
363 | * and a failure message is returned. | |
364 | */ | |
365 | log("Unknown packet type received after authentication: %d", type); | |
366 | } | |
367 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
368 | packet_send(); | |
369 | packet_write_wait(); | |
370 | ||
371 | /* Enable compression now that we have replied if appropriate. */ | |
372 | if (enable_compression_after_reply) { | |
373 | enable_compression_after_reply = 0; | |
374 | packet_start_compression(compression_level); | |
375 | } | |
376 | } | |
377 | } | |
378 | ||
379 | /* | |
380 | * This is called to fork and execute a command when we have no tty. This | |
381 | * will call do_child from the child, and server_loop from the parent after | |
382 | * setting up file descriptors and such. | |
383 | */ | |
6ae2364d | 384 | void |
7368a6c8 | 385 | do_exec_no_pty(Session *s, const char *command, struct passwd * pw) |
386 | { | |
387 | int pid; | |
388 | ||
389 | #ifdef USE_PIPES | |
390 | int pin[2], pout[2], perr[2]; | |
391 | /* Allocate pipes for communicating with the program. */ | |
392 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
393 | packet_disconnect("Could not create pipes: %.100s", | |
394 | strerror(errno)); | |
395 | #else /* USE_PIPES */ | |
396 | int inout[2], err[2]; | |
397 | /* Uses socket pairs to communicate with the program. */ | |
398 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
399 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
400 | packet_disconnect("Could not create socket pairs: %.100s", | |
401 | strerror(errno)); | |
402 | #endif /* USE_PIPES */ | |
403 | if (s == NULL) | |
404 | fatal("do_exec_no_pty: no session"); | |
405 | ||
1d1ffb87 | 406 | session_proctitle(s); |
7368a6c8 | 407 | |
408 | #ifdef USE_PAM | |
409 | do_pam_setcred(); | |
410 | #endif /* USE_PAM */ | |
411 | ||
412 | /* Fork the child. */ | |
413 | if ((pid = fork()) == 0) { | |
414 | /* Child. Reinitialize the log since the pid has changed. */ | |
415 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
416 | ||
417 | /* | |
418 | * Create a new session and process group since the 4.4BSD | |
419 | * setlogin() affects the entire process group. | |
420 | */ | |
421 | if (setsid() < 0) | |
422 | error("setsid failed: %.100s", strerror(errno)); | |
423 | ||
424 | #ifdef USE_PIPES | |
425 | /* | |
426 | * Redirect stdin. We close the parent side of the socket | |
427 | * pair, and make the child side the standard input. | |
428 | */ | |
429 | close(pin[1]); | |
430 | if (dup2(pin[0], 0) < 0) | |
431 | perror("dup2 stdin"); | |
432 | close(pin[0]); | |
433 | ||
434 | /* Redirect stdout. */ | |
435 | close(pout[0]); | |
436 | if (dup2(pout[1], 1) < 0) | |
437 | perror("dup2 stdout"); | |
438 | close(pout[1]); | |
439 | ||
440 | /* Redirect stderr. */ | |
441 | close(perr[0]); | |
442 | if (dup2(perr[1], 2) < 0) | |
443 | perror("dup2 stderr"); | |
444 | close(perr[1]); | |
445 | #else /* USE_PIPES */ | |
446 | /* | |
447 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
448 | * use the same socket, as some programs (particularly rdist) | |
449 | * seem to depend on it. | |
450 | */ | |
451 | close(inout[1]); | |
452 | close(err[1]); | |
453 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
454 | perror("dup2 stdin"); | |
455 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
456 | perror("dup2 stdout"); | |
457 | if (dup2(err[0], 2) < 0) /* stderr */ | |
458 | perror("dup2 stderr"); | |
459 | #endif /* USE_PIPES */ | |
460 | ||
461 | /* Do processing for the child (exec command etc). */ | |
462 | do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL); | |
463 | /* NOTREACHED */ | |
464 | } | |
465 | if (pid < 0) | |
466 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
467 | s->pid = pid; | |
468 | #ifdef USE_PIPES | |
469 | /* We are the parent. Close the child sides of the pipes. */ | |
470 | close(pin[0]); | |
471 | close(pout[1]); | |
472 | close(perr[1]); | |
473 | ||
e78a59f5 | 474 | if (compat20) { |
0b242b12 | 475 | session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1); |
e78a59f5 | 476 | } else { |
477 | /* Enter the interactive session. */ | |
478 | server_loop(pid, pin[1], pout[0], perr[0]); | |
479 | /* server_loop has closed pin[1], pout[1], and perr[1]. */ | |
480 | } | |
7368a6c8 | 481 | #else /* USE_PIPES */ |
482 | /* We are the parent. Close the child sides of the socket pairs. */ | |
483 | close(inout[0]); | |
484 | close(err[0]); | |
485 | ||
486 | /* | |
487 | * Enter the interactive session. Note: server_loop must be able to | |
488 | * handle the case that fdin and fdout are the same. | |
489 | */ | |
e78a59f5 | 490 | if (compat20) { |
0b242b12 | 491 | session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1); |
e78a59f5 | 492 | } else { |
493 | server_loop(pid, inout[1], inout[1], err[1]); | |
494 | /* server_loop has closed inout[1] and err[1]. */ | |
495 | } | |
7368a6c8 | 496 | #endif /* USE_PIPES */ |
497 | } | |
498 | ||
499 | /* | |
500 | * This is called to fork and execute a command when we have a tty. This | |
501 | * will call do_child from the child, and server_loop from the parent after | |
502 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
503 | * lastlog, and other such operations. | |
504 | */ | |
6ae2364d | 505 | void |
7368a6c8 | 506 | do_exec_pty(Session *s, const char *command, struct passwd * pw) |
507 | { | |
508 | FILE *f; | |
509 | char buf[100], *time_string; | |
510 | char line[256]; | |
511 | const char *hostname; | |
512 | int fdout, ptyfd, ttyfd, ptymaster; | |
513 | int quiet_login; | |
514 | pid_t pid; | |
515 | socklen_t fromlen; | |
516 | struct sockaddr_storage from; | |
517 | struct stat st; | |
518 | time_t last_login_time; | |
519 | ||
520 | if (s == NULL) | |
521 | fatal("do_exec_pty: no session"); | |
522 | ptyfd = s->ptyfd; | |
523 | ttyfd = s->ttyfd; | |
524 | ||
525 | /* Get remote host name. */ | |
526 | hostname = get_canonical_hostname(); | |
527 | ||
528 | /* | |
529 | * Get the time when the user last logged in. Buf will be set to | |
530 | * contain the hostname the last login was from. | |
531 | */ | |
532 | if (!options.use_login) { | |
533 | last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name, | |
534 | buf, sizeof(buf)); | |
535 | } | |
7368a6c8 | 536 | |
537 | #ifdef USE_PAM | |
538 | do_pam_session(pw->pw_name, s->tty); | |
539 | do_pam_setcred(); | |
540 | #endif /* USE_PAM */ | |
541 | ||
542 | /* Fork the child. */ | |
543 | if ((pid = fork()) == 0) { | |
544 | pid = getpid(); | |
545 | ||
546 | /* Child. Reinitialize the log because the pid has | |
547 | changed. */ | |
548 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
549 | ||
550 | /* Close the master side of the pseudo tty. */ | |
551 | close(ptyfd); | |
552 | ||
553 | /* Make the pseudo tty our controlling tty. */ | |
554 | pty_make_controlling_tty(&ttyfd, s->tty); | |
555 | ||
556 | /* Redirect stdin from the pseudo tty. */ | |
557 | if (dup2(ttyfd, fileno(stdin)) < 0) | |
558 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
559 | ||
560 | /* Redirect stdout to the pseudo tty. */ | |
561 | if (dup2(ttyfd, fileno(stdout)) < 0) | |
562 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
563 | ||
564 | /* Redirect stderr to the pseudo tty. */ | |
565 | if (dup2(ttyfd, fileno(stderr)) < 0) | |
566 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
567 | ||
568 | /* Close the extra descriptor for the pseudo tty. */ | |
569 | close(ttyfd); | |
570 | ||
1d1ffb87 | 571 | /* XXXX ? move to do_child() ??*/ |
7368a6c8 | 572 | /* |
573 | * Get IP address of client. This is needed because we want | |
574 | * to record where the user logged in from. If the | |
575 | * connection is not a socket, let the ip address be 0.0.0.0. | |
576 | */ | |
577 | memset(&from, 0, sizeof(from)); | |
578 | if (packet_connection_is_on_socket()) { | |
579 | fromlen = sizeof(from); | |
580 | if (getpeername(packet_get_connection_in(), | |
581 | (struct sockaddr *) & from, &fromlen) < 0) { | |
582 | debug("getpeername: %.100s", strerror(errno)); | |
583 | fatal_cleanup(); | |
584 | } | |
585 | } | |
586 | /* Record that there was a login on that terminal. */ | |
587 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, hostname, | |
588 | (struct sockaddr *)&from); | |
589 | ||
590 | /* Check if .hushlogin exists. */ | |
591 | snprintf(line, sizeof line, "%.200s/.hushlogin", pw->pw_dir); | |
592 | quiet_login = stat(line, &st) >= 0; | |
593 | ||
594 | #ifdef USE_PAM | |
595 | if (!quiet_login) | |
596 | print_pam_messages(); | |
597 | #endif /* USE_PAM */ | |
598 | ||
599 | /* | |
600 | * If the user has logged in before, display the time of last | |
601 | * login. However, don't display anything extra if a command | |
602 | * has been specified (so that ssh can be used to execute | |
603 | * commands on a remote machine without users knowing they | |
604 | * are going to another machine). Login(1) will do this for | |
605 | * us as well, so check if login(1) is used | |
606 | */ | |
607 | if (command == NULL && last_login_time != 0 && !quiet_login && | |
608 | !options.use_login) { | |
609 | /* Convert the date to a string. */ | |
610 | time_string = ctime(&last_login_time); | |
611 | /* Remove the trailing newline. */ | |
612 | if (strchr(time_string, '\n')) | |
613 | *strchr(time_string, '\n') = 0; | |
614 | /* Display the last login time. Host if displayed | |
615 | if known. */ | |
616 | if (strcmp(buf, "") == 0) | |
617 | printf("Last login: %s\r\n", time_string); | |
618 | else | |
619 | printf("Last login: %s from %s\r\n", time_string, buf); | |
620 | } | |
621 | /* | |
622 | * Print /etc/motd unless a command was specified or printing | |
623 | * it was disabled in server options or login(1) will be | |
624 | * used. Note that some machines appear to print it in | |
625 | * /etc/profile or similar. | |
626 | */ | |
627 | if (command == NULL && options.print_motd && !quiet_login && | |
628 | !options.use_login) { | |
629 | /* Print /etc/motd if it exists. */ | |
630 | f = fopen("/etc/motd", "r"); | |
631 | if (f) { | |
632 | while (fgets(line, sizeof(line), f)) | |
633 | fputs(line, stdout); | |
634 | fclose(f); | |
635 | } | |
636 | } | |
c1ef8333 | 637 | #if defined(WITH_AIXAUTHENTICATE) |
638 | /* | |
639 | * AIX handles the lastlog info differently. Display it here. | |
640 | */ | |
641 | if (command == NULL && aixloginmsg && *aixloginmsg && | |
642 | !quiet_login && !options.use_login) { | |
643 | printf("%s\n", aixloginmsg); | |
644 | } | |
645 | #endif | |
7368a6c8 | 646 | /* Do common processing for the child, such as execing the command. */ |
71276795 | 647 | do_child(command, pw, s->term, s->display, s->auth_proto, |
648 | s->auth_data, s->tty); | |
7368a6c8 | 649 | /* NOTREACHED */ |
650 | } | |
651 | if (pid < 0) | |
652 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
653 | s->pid = pid; | |
654 | ||
655 | /* Parent. Close the slave side of the pseudo tty. */ | |
656 | close(ttyfd); | |
657 | ||
658 | /* | |
659 | * Create another descriptor of the pty master side for use as the | |
660 | * standard input. We could use the original descriptor, but this | |
661 | * simplifies code in server_loop. The descriptor is bidirectional. | |
662 | */ | |
663 | fdout = dup(ptyfd); | |
664 | if (fdout < 0) | |
665 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
666 | ||
667 | /* we keep a reference to the pty master */ | |
668 | ptymaster = dup(ptyfd); | |
669 | if (ptymaster < 0) | |
670 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
671 | s->ptymaster = ptymaster; | |
672 | ||
673 | /* Enter interactive session. */ | |
e78a59f5 | 674 | if (compat20) { |
675 | session_set_fds(s, ptyfd, fdout, -1); | |
676 | } else { | |
677 | server_loop(pid, ptyfd, fdout, -1); | |
678 | /* server_loop _has_ closed ptyfd and fdout. */ | |
679 | session_pty_cleanup(s); | |
680 | } | |
7368a6c8 | 681 | } |
682 | ||
683 | /* | |
684 | * Sets the value of the given variable in the environment. If the variable | |
685 | * already exists, its value is overriden. | |
686 | */ | |
6ae2364d | 687 | void |
7368a6c8 | 688 | child_set_env(char ***envp, unsigned int *envsizep, const char *name, |
689 | const char *value) | |
690 | { | |
691 | unsigned int i, namelen; | |
692 | char **env; | |
693 | ||
694 | /* | |
695 | * Find the slot where the value should be stored. If the variable | |
696 | * already exists, we reuse the slot; otherwise we append a new slot | |
697 | * at the end of the array, expanding if necessary. | |
698 | */ | |
699 | env = *envp; | |
700 | namelen = strlen(name); | |
701 | for (i = 0; env[i]; i++) | |
702 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
703 | break; | |
704 | if (env[i]) { | |
705 | /* Reuse the slot. */ | |
706 | xfree(env[i]); | |
707 | } else { | |
708 | /* New variable. Expand if necessary. */ | |
709 | if (i >= (*envsizep) - 1) { | |
710 | (*envsizep) += 50; | |
711 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
712 | } | |
713 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
714 | env[i + 1] = NULL; | |
715 | } | |
716 | ||
717 | /* Allocate space and format the variable in the appropriate slot. */ | |
718 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
719 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
720 | } | |
721 | ||
722 | /* | |
723 | * Reads environment variables from the given file and adds/overrides them | |
724 | * into the environment. If the file does not exist, this does nothing. | |
725 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
726 | * and assignments of the form name=value. No other forms are allowed. | |
727 | */ | |
6ae2364d | 728 | void |
7368a6c8 | 729 | read_environment_file(char ***env, unsigned int *envsize, |
730 | const char *filename) | |
731 | { | |
732 | FILE *f; | |
733 | char buf[4096]; | |
734 | char *cp, *value; | |
735 | ||
736 | f = fopen(filename, "r"); | |
737 | if (!f) | |
738 | return; | |
739 | ||
740 | while (fgets(buf, sizeof(buf), f)) { | |
741 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
742 | ; | |
743 | if (!*cp || *cp == '#' || *cp == '\n') | |
744 | continue; | |
745 | if (strchr(cp, '\n')) | |
746 | *strchr(cp, '\n') = '\0'; | |
747 | value = strchr(cp, '='); | |
748 | if (value == NULL) { | |
749 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
750 | continue; | |
751 | } | |
71276795 | 752 | /* |
753 | * Replace the equals sign by nul, and advance value to | |
754 | * the value string. | |
755 | */ | |
7368a6c8 | 756 | *value = '\0'; |
757 | value++; | |
758 | child_set_env(env, envsize, cp, value); | |
759 | } | |
760 | fclose(f); | |
761 | } | |
762 | ||
763 | #ifdef USE_PAM | |
764 | /* | |
765 | * Sets any environment variables which have been specified by PAM | |
766 | */ | |
767 | void do_pam_environment(char ***env, int *envsize) | |
768 | { | |
769 | char *equals, var_name[512], var_val[512]; | |
770 | char **pam_env; | |
771 | int i; | |
772 | ||
773 | if ((pam_env = fetch_pam_environment()) == NULL) | |
774 | return; | |
775 | ||
776 | for(i = 0; pam_env[i] != NULL; i++) { | |
777 | if ((equals = strstr(pam_env[i], "=")) == NULL) | |
778 | continue; | |
779 | ||
780 | if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) { | |
781 | memset(var_name, '\0', sizeof(var_name)); | |
782 | memset(var_val, '\0', sizeof(var_val)); | |
783 | ||
784 | strncpy(var_name, pam_env[i], equals - pam_env[i]); | |
785 | strcpy(var_val, equals + 1); | |
786 | ||
787 | debug("PAM environment: %s=%s", var_name, var_val); | |
788 | ||
789 | child_set_env(env, envsize, var_name, var_val); | |
790 | } | |
791 | } | |
792 | } | |
793 | #endif /* USE_PAM */ | |
794 | ||
5fa45897 | 795 | #if defined(HAVE_GETUSERATTR) |
796 | /* | |
797 | * AIX-specific login initialisation | |
798 | */ | |
799 | void set_limit(char *user, char *soft, char *hard, int resource, int mult) | |
800 | { | |
801 | struct rlimit rlim; | |
56118702 | 802 | int slim, hlim; |
5fa45897 | 803 | |
804 | getrlimit(resource, &rlim); | |
805 | ||
56118702 | 806 | slim = 0; |
807 | if (getuserattr(user, soft, &slim, SEC_INT) != -1) { | |
808 | if (slim < 0) { | |
809 | rlim.rlim_cur = RLIM_INFINITY; | |
810 | } else if (slim != 0) { | |
811 | /* See the wackiness below */ | |
812 | if (rlim.rlim_cur == slim * mult) | |
813 | slim = 0; | |
814 | else | |
815 | rlim.rlim_cur = slim * mult; | |
816 | } | |
817 | } | |
5fa45897 | 818 | |
56118702 | 819 | hlim = 0; |
820 | if (getuserattr(user, hard, &hlim, SEC_INT) != -1) { | |
821 | if (hlim < 0) { | |
822 | rlim.rlim_max = RLIM_INFINITY; | |
823 | } else if (hlim != 0) { | |
824 | rlim.rlim_max = hlim * mult; | |
825 | } | |
826 | } | |
5fa45897 | 827 | |
56118702 | 828 | /* |
829 | * XXX For cpu and fsize the soft limit is set to the hard limit | |
830 | * if the hard limit is left at its default value and the soft limit | |
831 | * is changed from its default value, either by requesting it | |
832 | * (slim == 0) or by setting it to the current default. At least | |
833 | * that's how rlogind does it. If you're confused you're not alone. | |
834 | * Bug or feature? AIX 4.3.1.2 | |
835 | */ | |
836 | if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu")) | |
837 | && hlim == 0 && slim != 0) | |
838 | rlim.rlim_max = rlim.rlim_cur; | |
839 | /* A specified hard limit limits the soft limit */ | |
840 | else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max) | |
841 | rlim.rlim_cur = rlim.rlim_max; | |
842 | /* A soft limit can increase a hard limit */ | |
843 | else if (rlim.rlim_cur > rlim.rlim_max) | |
5fa45897 | 844 | rlim.rlim_max = rlim.rlim_cur; |
845 | ||
846 | if (setrlimit(resource, &rlim) != 0) | |
56118702 | 847 | error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno)); |
5fa45897 | 848 | } |
849 | ||
850 | void set_limits_from_userattr(char *user) | |
851 | { | |
852 | int mask; | |
853 | char buf[16]; | |
854 | ||
855 | set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512); | |
856 | set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1); | |
857 | set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512); | |
858 | set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512); | |
859 | set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512); | |
860 | set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512); | |
861 | #if defined(S_UNOFILE) | |
862 | set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1); | |
863 | #endif | |
864 | ||
865 | if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) { | |
866 | /* Convert decimal to octal */ | |
867 | (void) snprintf(buf, sizeof(buf), "%d", mask); | |
868 | if (sscanf(buf, "%o", &mask) == 1) | |
869 | umask(mask); | |
870 | } | |
871 | } | |
872 | #endif /* defined(HAVE_GETUSERATTR) */ | |
873 | ||
7368a6c8 | 874 | /* |
875 | * Performs common processing for the child, such as setting up the | |
876 | * environment, closing extra file descriptors, setting the user and group | |
877 | * ids, and executing the command or shell. | |
878 | */ | |
6ae2364d | 879 | void |
7368a6c8 | 880 | do_child(const char *command, struct passwd * pw, const char *term, |
881 | const char *display, const char *auth_proto, | |
882 | const char *auth_data, const char *ttyname) | |
883 | { | |
884 | const char *shell, *cp = NULL; | |
885 | char buf[256]; | |
6fc1e9f3 | 886 | char cmd[1024]; |
7368a6c8 | 887 | FILE *f; |
888 | unsigned int envsize, i; | |
889 | char **env; | |
890 | extern char **environ; | |
891 | struct stat st; | |
892 | char *argv[10]; | |
3206bb3b | 893 | #ifdef WITH_IRIX_PROJECT |
894 | prid_t projid; | |
895 | #endif /* WITH_IRIX_PROJECT */ | |
7368a6c8 | 896 | |
fa649821 | 897 | /* login(1) is only called if we execute the login shell */ |
898 | if (options.use_login && command != NULL) | |
899 | options.use_login = 0; | |
900 | ||
7368a6c8 | 901 | #ifndef USE_PAM /* pam_nologin handles this */ |
902 | f = fopen("/etc/nologin", "r"); | |
903 | if (f) { | |
904 | /* /etc/nologin exists. Print its contents and exit. */ | |
905 | while (fgets(buf, sizeof(buf), f)) | |
906 | fputs(buf, stderr); | |
907 | fclose(f); | |
908 | if (pw->pw_uid != 0) | |
909 | exit(254); | |
910 | } | |
911 | #endif /* USE_PAM */ | |
912 | ||
4d33e531 | 913 | #ifndef HAVE_OSF_SIA |
7368a6c8 | 914 | /* Set login name in the kernel. */ |
915 | if (setlogin(pw->pw_name) < 0) | |
916 | error("setlogin failed: %s", strerror(errno)); | |
4d33e531 | 917 | #endif |
7368a6c8 | 918 | |
919 | /* Set uid, gid, and groups. */ | |
920 | /* Login(1) does this as well, and it needs uid 0 for the "-h" | |
921 | switch, so we let login(1) to this for us. */ | |
922 | if (!options.use_login) { | |
4d33e531 | 923 | #ifdef HAVE_OSF_SIA |
924 | extern char **saved_argv; | |
925 | extern int saved_argc; | |
926 | char *host = get_canonical_hostname (); | |
927 | ||
928 | if (sia_become_user(NULL, saved_argc, saved_argv, host, | |
929 | pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) != | |
930 | SIASUCCESS) { | |
931 | perror("sia_become_user"); | |
932 | exit(1); | |
933 | } | |
934 | if (setreuid(geteuid(), geteuid()) < 0) { | |
935 | perror("setreuid"); | |
936 | exit(1); | |
937 | } | |
938 | #else /* HAVE_OSF_SIA */ | |
7368a6c8 | 939 | if (getuid() == 0 || geteuid() == 0) { |
5fa45897 | 940 | #if defined(HAVE_GETUSERATTR) |
941 | set_limits_from_userattr(pw->pw_name); | |
942 | #endif /* defined(HAVE_GETUSERATTR) */ | |
943 | ||
7368a6c8 | 944 | if (setgid(pw->pw_gid) < 0) { |
945 | perror("setgid"); | |
946 | exit(1); | |
947 | } | |
948 | /* Initialize the group list. */ | |
949 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
950 | perror("initgroups"); | |
951 | exit(1); | |
952 | } | |
953 | endgrent(); | |
954 | ||
3206bb3b | 955 | #ifdef WITH_IRIX_ARRAY |
956 | /* initialize array session */ | |
957 | if (newarraysess() != 0) | |
958 | fatal("Failed to set up new array session: %.100s", | |
959 | strerror(errno)); | |
960 | #endif /* WITH_IRIX_ARRAY */ | |
961 | ||
962 | #ifdef WITH_IRIX_PROJECT | |
963 | /* initialize irix project info */ | |
964 | if ((projid = getdfltprojuser(pw->pw_name)) == -1) { | |
965 | debug("Failed to get project id, using projid 0"); | |
966 | projid = 0; | |
967 | } | |
968 | ||
969 | if (setprid(projid)) | |
970 | fatal("Failed to initialize project %d for %s: %.100s", | |
971 | (int)projid, pw->pw_name, strerror(errno)); | |
972 | #endif /* WITH_IRIX_PROJECT */ | |
973 | ||
7368a6c8 | 974 | /* Permanently switch to the desired uid. */ |
975 | permanently_set_uid(pw->pw_uid); | |
976 | } | |
977 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) | |
978 | fatal("Failed to set uids to %d.", (int) pw->pw_uid); | |
4d33e531 | 979 | #endif /* HAVE_OSF_SIA */ |
7368a6c8 | 980 | } |
981 | /* | |
982 | * Get the shell from the password data. An empty shell field is | |
983 | * legal, and means /bin/sh. | |
984 | */ | |
985 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
986 | ||
987 | #ifdef AFS | |
988 | /* Try to get AFS tokens for the local cell. */ | |
989 | if (k_hasafs()) { | |
990 | char cell[64]; | |
991 | ||
992 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
993 | krb_afslog(cell, 0); | |
994 | ||
995 | krb_afslog(0, 0); | |
996 | } | |
997 | #endif /* AFS */ | |
998 | ||
999 | /* Initialize the environment. */ | |
1000 | envsize = 100; | |
1001 | env = xmalloc(envsize * sizeof(char *)); | |
1002 | env[0] = NULL; | |
1003 | ||
1004 | if (!options.use_login) { | |
1005 | /* Set basic environment. */ | |
1006 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1007 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1008 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
1009 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1010 | ||
1011 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1012 | _PATH_MAILDIR, pw->pw_name); | |
1013 | child_set_env(&env, &envsize, "MAIL", buf); | |
1014 | ||
1015 | /* Normal systems set SHELL by default. */ | |
1016 | child_set_env(&env, &envsize, "SHELL", shell); | |
1017 | } | |
1018 | if (getenv("TZ")) | |
1019 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1020 | ||
1021 | /* Set custom environment options from RSA authentication. */ | |
1022 | while (custom_environment) { | |
1023 | struct envstring *ce = custom_environment; | |
1024 | char *s = ce->s; | |
1025 | int i; | |
1026 | for (i = 0; s[i] != '=' && s[i]; i++); | |
1027 | if (s[i] == '=') { | |
1028 | s[i] = 0; | |
1029 | child_set_env(&env, &envsize, s, s + i + 1); | |
1030 | } | |
1031 | custom_environment = ce->next; | |
1032 | xfree(ce->s); | |
1033 | xfree(ce); | |
1034 | } | |
1035 | ||
1036 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
1037 | get_remote_ipaddr(), get_remote_port(), get_local_port()); | |
1038 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); | |
1039 | ||
1040 | if (ttyname) | |
1041 | child_set_env(&env, &envsize, "SSH_TTY", ttyname); | |
1042 | if (term) | |
1043 | child_set_env(&env, &envsize, "TERM", term); | |
1044 | if (display) | |
1045 | child_set_env(&env, &envsize, "DISPLAY", display); | |
1046 | ||
1047 | #ifdef _AIX | |
1048 | { | |
1049 | char *authstate,*krb5cc; | |
1050 | ||
1051 | if ((authstate = getenv("AUTHSTATE")) != NULL) | |
1052 | child_set_env(&env,&envsize,"AUTHSTATE",authstate); | |
1053 | ||
1054 | if ((krb5cc = getenv("KRB5CCNAME")) != NULL) | |
1055 | child_set_env(&env,&envsize,"KRB5CCNAME",krb5cc); | |
1056 | } | |
1057 | #endif | |
1058 | ||
1059 | #ifdef KRB4 | |
1060 | { | |
1061 | extern char *ticket; | |
1062 | ||
1063 | if (ticket) | |
1064 | child_set_env(&env, &envsize, "KRBTKFILE", ticket); | |
1065 | } | |
1066 | #endif /* KRB4 */ | |
1067 | ||
1068 | #ifdef USE_PAM | |
1069 | /* Pull in any environment variables that may have been set by PAM. */ | |
1070 | do_pam_environment(&env, &envsize); | |
1071 | #endif /* USE_PAM */ | |
1072 | ||
1073 | read_environment_file(&env,&envsize,"/etc/environment"); | |
1074 | ||
1075 | if (xauthfile) | |
1076 | child_set_env(&env, &envsize, "XAUTHORITY", xauthfile); | |
1077 | if (auth_get_socket_name() != NULL) | |
1078 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, | |
1079 | auth_get_socket_name()); | |
1080 | ||
1081 | /* read $HOME/.ssh/environment. */ | |
1082 | if (!options.use_login) { | |
71276795 | 1083 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1084 | pw->pw_dir); | |
7368a6c8 | 1085 | read_environment_file(&env, &envsize, buf); |
1086 | } | |
1087 | if (debug_flag) { | |
1088 | /* dump the environment */ | |
1089 | fprintf(stderr, "Environment:\n"); | |
1090 | for (i = 0; env[i]; i++) | |
1091 | fprintf(stderr, " %.200s\n", env[i]); | |
1092 | } | |
1093 | /* | |
1094 | * Close the connection descriptors; note that this is the child, and | |
1095 | * the server will still have the socket open, and it is important | |
1096 | * that we do not shutdown it. Note that the descriptors cannot be | |
1097 | * closed before building the environment, as we call | |
1098 | * get_remote_ipaddr there. | |
1099 | */ | |
1100 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1101 | close(packet_get_connection_in()); | |
1102 | else { | |
1103 | close(packet_get_connection_in()); | |
1104 | close(packet_get_connection_out()); | |
1105 | } | |
1106 | /* | |
1107 | * Close all descriptors related to channels. They will still remain | |
1108 | * open in the parent. | |
1109 | */ | |
1110 | /* XXX better use close-on-exec? -markus */ | |
1111 | channel_close_all(); | |
1112 | ||
1113 | /* | |
1114 | * Close any extra file descriptors. Note that there may still be | |
1115 | * descriptors left by system functions. They will be closed later. | |
1116 | */ | |
1117 | endpwent(); | |
1118 | ||
1119 | /* | |
1120 | * Close any extra open file descriptors so that we don\'t have them | |
1121 | * hanging around in clients. Note that we want to do this after | |
1122 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1123 | * descriptors open. | |
1124 | */ | |
1125 | for (i = 3; i < 64; i++) | |
1126 | close(i); | |
1127 | ||
1128 | /* Change current directory to the user\'s home directory. */ | |
1129 | if (chdir(pw->pw_dir) < 0) | |
1130 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1131 | pw->pw_dir, strerror(errno)); | |
1132 | ||
1133 | /* | |
1134 | * Must take new environment into use so that .ssh/rc, /etc/sshrc and | |
1135 | * xauth are run in the proper environment. | |
1136 | */ | |
1137 | environ = env; | |
1138 | ||
1139 | /* | |
1140 | * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first | |
1141 | * in this order). | |
1142 | */ | |
1143 | if (!options.use_login) { | |
1144 | if (stat(SSH_USER_RC, &st) >= 0) { | |
1145 | if (debug_flag) | |
30228d7c | 1146 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_USER_RC); |
7368a6c8 | 1147 | |
30228d7c | 1148 | f = popen(_PATH_BSHELL " " SSH_USER_RC, "w"); |
7368a6c8 | 1149 | if (f) { |
1150 | if (auth_proto != NULL && auth_data != NULL) | |
1151 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1152 | pclose(f); | |
1153 | } else | |
1154 | fprintf(stderr, "Could not run %s\n", SSH_USER_RC); | |
1155 | } else if (stat(SSH_SYSTEM_RC, &st) >= 0) { | |
1156 | if (debug_flag) | |
30228d7c | 1157 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_SYSTEM_RC); |
7368a6c8 | 1158 | |
30228d7c | 1159 | f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w"); |
7368a6c8 | 1160 | if (f) { |
1161 | if (auth_proto != NULL && auth_data != NULL) | |
1162 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1163 | pclose(f); | |
1164 | } else | |
1165 | fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC); | |
6fc1e9f3 | 1166 | } else if (options.xauth_location != NULL) { |
7368a6c8 | 1167 | /* Add authority data to .Xauthority if appropriate. */ |
1168 | if (auth_proto != NULL && auth_data != NULL) { | |
29611d9c | 1169 | char *screen = strchr(display, ':'); |
1170 | if (debug_flag) { | |
71276795 | 1171 | fprintf(stderr, |
1172 | "Running %.100s add %.100s %.100s %.100s\n", | |
6fc1e9f3 | 1173 | options.xauth_location, display, |
1174 | auth_proto, auth_data); | |
29611d9c | 1175 | if (screen != NULL) |
71276795 | 1176 | fprintf(stderr, |
1177 | "Adding %.*s/unix%s %s %s\n", | |
1178 | screen-display, display, | |
1179 | screen, auth_proto, auth_data); | |
29611d9c | 1180 | } |
6fc1e9f3 | 1181 | snprintf(cmd, sizeof cmd, "%s -q -", |
1182 | options.xauth_location); | |
1183 | f = popen(cmd, "w"); | |
7368a6c8 | 1184 | if (f) { |
71276795 | 1185 | fprintf(f, "add %s %s %s\n", display, |
1186 | auth_proto, auth_data); | |
29611d9c | 1187 | if (screen != NULL) |
1188 | fprintf(f, "add %.*s/unix%s %s %s\n", | |
71276795 | 1189 | screen-display, display, |
1190 | screen, auth_proto, auth_data); | |
7368a6c8 | 1191 | pclose(f); |
6fc1e9f3 | 1192 | } else { |
1193 | fprintf(stderr, "Could not run %s\n", | |
1194 | cmd); | |
1195 | } | |
7368a6c8 | 1196 | } |
1197 | } | |
7368a6c8 | 1198 | /* Get the last component of the shell name. */ |
1199 | cp = strrchr(shell, '/'); | |
1200 | if (cp) | |
1201 | cp++; | |
1202 | else | |
1203 | cp = shell; | |
1204 | } | |
1205 | /* | |
1206 | * If we have no command, execute the shell. In this case, the shell | |
1207 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1208 | * this is a login shell. | |
1209 | */ | |
1210 | if (!command) { | |
1211 | if (!options.use_login) { | |
1212 | char buf[256]; | |
1213 | ||
1214 | /* | |
1215 | * Check for mail if we have a tty and it was enabled | |
1216 | * in server options. | |
1217 | */ | |
1218 | if (ttyname && options.check_mail) { | |
1219 | char *mailbox; | |
1220 | struct stat mailstat; | |
1221 | mailbox = getenv("MAIL"); | |
1222 | if (mailbox != NULL) { | |
71276795 | 1223 | if (stat(mailbox, &mailstat) != 0 || |
1224 | mailstat.st_size == 0) | |
7368a6c8 | 1225 | printf("No mail.\n"); |
1226 | else if (mailstat.st_mtime < mailstat.st_atime) | |
1227 | printf("You have mail.\n"); | |
1228 | else | |
1229 | printf("You have new mail.\n"); | |
1230 | } | |
1231 | } | |
1232 | /* Start the shell. Set initial character to '-'. */ | |
1233 | buf[0] = '-'; | |
1234 | strncpy(buf + 1, cp, sizeof(buf) - 1); | |
1235 | buf[sizeof(buf) - 1] = 0; | |
1236 | ||
1237 | /* Execute the shell. */ | |
1238 | argv[0] = buf; | |
1239 | argv[1] = NULL; | |
1240 | execve(shell, argv, env); | |
1241 | ||
1242 | /* Executing the shell failed. */ | |
1243 | perror(shell); | |
1244 | exit(1); | |
1245 | ||
1246 | } else { | |
1247 | /* Launch login(1). */ | |
1248 | ||
30228d7c | 1249 | execl(LOGIN_PROGRAM, "login", "-h", get_remote_ipaddr(), |
7368a6c8 | 1250 | "-p", "-f", "--", pw->pw_name, NULL); |
1251 | ||
1252 | /* Login couldn't be executed, die. */ | |
1253 | ||
1254 | perror("login"); | |
1255 | exit(1); | |
1256 | } | |
1257 | } | |
1258 | /* | |
1259 | * Execute the command using the user's shell. This uses the -c | |
1260 | * option to execute the command. | |
1261 | */ | |
1262 | argv[0] = (char *) cp; | |
1263 | argv[1] = "-c"; | |
1264 | argv[2] = (char *) command; | |
1265 | argv[3] = NULL; | |
1266 | execve(shell, argv, env); | |
1267 | perror(shell); | |
1268 | exit(1); | |
1269 | } | |
1270 | ||
1271 | Session * | |
1272 | session_new(void) | |
1273 | { | |
1274 | int i; | |
1275 | static int did_init = 0; | |
1276 | if (!did_init) { | |
1277 | debug("session_new: init"); | |
1278 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1279 | sessions[i].used = 0; | |
1280 | sessions[i].self = i; | |
1281 | } | |
1282 | did_init = 1; | |
1283 | } | |
1284 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1285 | Session *s = &sessions[i]; | |
1286 | if (! s->used) { | |
1287 | s->pid = 0; | |
0b242b12 | 1288 | s->extended = 0; |
7368a6c8 | 1289 | s->chanid = -1; |
1290 | s->ptyfd = -1; | |
1291 | s->ttyfd = -1; | |
1292 | s->term = NULL; | |
1293 | s->pw = NULL; | |
1294 | s->display = NULL; | |
1295 | s->screen = 0; | |
1296 | s->auth_data = NULL; | |
1297 | s->auth_proto = NULL; | |
1298 | s->used = 1; | |
0b242b12 | 1299 | s->pw = NULL; |
7368a6c8 | 1300 | debug("session_new: session %d", i); |
1301 | return s; | |
1302 | } | |
1303 | } | |
1304 | return NULL; | |
1305 | } | |
1306 | ||
1307 | void | |
1308 | session_dump(void) | |
1309 | { | |
1310 | int i; | |
1311 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1312 | Session *s = &sessions[i]; | |
1313 | debug("dump: used %d session %d %p channel %d pid %d", | |
1314 | s->used, | |
1315 | s->self, | |
1316 | s, | |
1317 | s->chanid, | |
1318 | s->pid); | |
1319 | } | |
1320 | } | |
1321 | ||
e78a59f5 | 1322 | int |
1323 | session_open(int chanid) | |
1324 | { | |
1325 | Session *s = session_new(); | |
1326 | debug("session_open: channel %d", chanid); | |
1327 | if (s == NULL) { | |
1328 | error("no more sessions"); | |
1329 | return 0; | |
1330 | } | |
e78a59f5 | 1331 | s->pw = auth_get_user(); |
1332 | if (s->pw == NULL) | |
0b242b12 | 1333 | fatal("no user for session %i", s->self); |
1334 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1335 | s->chanid = chanid; | |
e78a59f5 | 1336 | return 1; |
1337 | } | |
1338 | ||
1339 | Session * | |
1340 | session_by_channel(int id) | |
1341 | { | |
1342 | int i; | |
1343 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1344 | Session *s = &sessions[i]; | |
1345 | if (s->used && s->chanid == id) { | |
1346 | debug("session_by_channel: session %d channel %d", i, id); | |
1347 | return s; | |
1348 | } | |
1349 | } | |
1350 | debug("session_by_channel: unknown channel %d", id); | |
1351 | session_dump(); | |
1352 | return NULL; | |
1353 | } | |
1354 | ||
1355 | Session * | |
1356 | session_by_pid(pid_t pid) | |
1357 | { | |
1358 | int i; | |
1359 | debug("session_by_pid: pid %d", pid); | |
1360 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1361 | Session *s = &sessions[i]; | |
1362 | if (s->used && s->pid == pid) | |
1363 | return s; | |
1364 | } | |
1365 | error("session_by_pid: unknown pid %d", pid); | |
1366 | session_dump(); | |
1367 | return NULL; | |
1368 | } | |
1369 | ||
1370 | int | |
1371 | session_window_change_req(Session *s) | |
1372 | { | |
1373 | s->col = packet_get_int(); | |
1374 | s->row = packet_get_int(); | |
1375 | s->xpixel = packet_get_int(); | |
1376 | s->ypixel = packet_get_int(); | |
6ae2364d | 1377 | packet_done(); |
e78a59f5 | 1378 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1379 | return 1; | |
1380 | } | |
1381 | ||
1382 | int | |
1383 | session_pty_req(Session *s) | |
1384 | { | |
1385 | unsigned int len; | |
6ae2364d | 1386 | char *term_modes; /* encoded terminal modes */ |
e78a59f5 | 1387 | |
38c295d6 | 1388 | if (no_pty_flag) |
1389 | return 0; | |
e78a59f5 | 1390 | if (s->ttyfd != -1) |
6ae2364d | 1391 | return 0; |
e78a59f5 | 1392 | s->term = packet_get_string(&len); |
1393 | s->col = packet_get_int(); | |
1394 | s->row = packet_get_int(); | |
1395 | s->xpixel = packet_get_int(); | |
1396 | s->ypixel = packet_get_int(); | |
6ae2364d | 1397 | term_modes = packet_get_string(&len); |
1398 | packet_done(); | |
e78a59f5 | 1399 | |
1400 | if (strcmp(s->term, "") == 0) { | |
1401 | xfree(s->term); | |
1402 | s->term = NULL; | |
1403 | } | |
1404 | /* Allocate a pty and open it. */ | |
1405 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) { | |
1406 | xfree(s->term); | |
1407 | s->term = NULL; | |
1408 | s->ptyfd = -1; | |
1409 | s->ttyfd = -1; | |
1410 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1411 | xfree(term_modes); |
1412 | return 0; | |
e78a59f5 | 1413 | } |
1414 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1415 | /* | |
1416 | * Add a cleanup function to clear the utmp entry and record logout | |
1417 | * time in case we call fatal() (e.g., the connection gets closed). | |
1418 | */ | |
1419 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
1420 | pty_setowner(s->pw, s->tty); | |
1421 | /* Get window size from the packet. */ | |
1422 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1423 | ||
1d1ffb87 | 1424 | session_proctitle(s); |
1425 | ||
35484284 | 1426 | /* XXX parse and set terminal modes */ |
1427 | xfree(term_modes); | |
e78a59f5 | 1428 | return 1; |
1429 | } | |
1430 | ||
0b242b12 | 1431 | int |
1432 | session_subsystem_req(Session *s) | |
1433 | { | |
1434 | unsigned int len; | |
1435 | int success = 0; | |
1436 | char *subsys = packet_get_string(&len); | |
38c295d6 | 1437 | int i; |
0b242b12 | 1438 | |
1439 | packet_done(); | |
1440 | log("subsystem request for %s", subsys); | |
1441 | ||
38c295d6 | 1442 | for (i = 0; i < options.num_subsystems; i++) { |
1443 | if(strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1444 | debug("subsystem: exec() %s", options.subsystem_command[i]); | |
1445 | do_exec_no_pty(s, options.subsystem_command[i], s->pw); | |
1446 | success = 1; | |
1447 | } | |
1448 | } | |
1449 | ||
1450 | if (!success) | |
1451 | log("subsystem request for %s failed, subsystem not found", subsys); | |
1452 | ||
0b242b12 | 1453 | xfree(subsys); |
1454 | return success; | |
1455 | } | |
1456 | ||
1457 | int | |
1458 | session_x11_req(Session *s) | |
1459 | { | |
38c295d6 | 1460 | if (!no_port_forwarding_flag) { |
1461 | debug("X11 forwarding disabled in user configuration file."); | |
1462 | return 0; | |
1463 | } | |
0b242b12 | 1464 | if (!options.x11_forwarding) { |
1465 | debug("X11 forwarding disabled in server configuration file."); | |
1466 | return 0; | |
1467 | } | |
1468 | if (xauthfile != NULL) { | |
1469 | debug("X11 fwd already started."); | |
1470 | return 0; | |
1471 | } | |
1472 | ||
1473 | debug("Received request for X11 forwarding with auth spoofing."); | |
1474 | if (s->display != NULL) | |
1475 | packet_disconnect("Protocol error: X11 display already set."); | |
1476 | ||
1477 | s->single_connection = packet_get_char(); | |
1478 | s->auth_proto = packet_get_string(NULL); | |
1479 | s->auth_data = packet_get_string(NULL); | |
1480 | s->screen = packet_get_int(); | |
1481 | packet_done(); | |
1482 | ||
1483 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
1484 | if (s->display == NULL) { | |
1485 | xfree(s->auth_proto); | |
1486 | xfree(s->auth_data); | |
1487 | return 0; | |
1488 | } | |
1489 | xauthfile = xmalloc(MAXPATHLEN); | |
1490 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
1491 | temporarily_use_uid(s->pw->pw_uid); | |
1492 | if (mkdtemp(xauthfile) == NULL) { | |
1493 | restore_uid(); | |
1494 | error("private X11 dir: mkdtemp %s failed: %s", | |
1495 | xauthfile, strerror(errno)); | |
1496 | xfree(xauthfile); | |
1497 | xauthfile = NULL; | |
1498 | xfree(s->auth_proto); | |
1499 | xfree(s->auth_data); | |
1500 | /* XXXX remove listening channels */ | |
1501 | return 0; | |
1502 | } | |
1503 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
1504 | open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); | |
1505 | restore_uid(); | |
1506 | fatal_add_cleanup(xauthfile_cleanup_proc, s); | |
1507 | return 1; | |
1508 | } | |
1509 | ||
38c295d6 | 1510 | int |
1511 | session_shell_req(Session *s) | |
1512 | { | |
1513 | /* if forced_command == NULL, the shell is execed */ | |
1514 | char *shell = forced_command; | |
1515 | packet_done(); | |
1516 | s->extended = 1; | |
1517 | if (s->ttyfd == -1) | |
1518 | do_exec_no_pty(s, shell, s->pw); | |
1519 | else | |
1520 | do_exec_pty(s, shell, s->pw); | |
1521 | return 1; | |
1522 | } | |
1523 | ||
1524 | int | |
1525 | session_exec_req(Session *s) | |
1526 | { | |
1527 | unsigned int len; | |
1528 | char *command = packet_get_string(&len); | |
1529 | packet_done(); | |
1530 | if (forced_command) { | |
1531 | xfree(command); | |
1532 | command = forced_command; | |
1533 | debug("Forced command '%.500s'", forced_command); | |
1534 | } | |
1535 | s->extended = 1; | |
1536 | if (s->ttyfd == -1) | |
1537 | do_exec_no_pty(s, command, s->pw); | |
1538 | else | |
1539 | do_exec_pty(s, command, s->pw); | |
1540 | if (forced_command == NULL) | |
1541 | xfree(command); | |
1542 | return 1; | |
1543 | } | |
1544 | ||
e78a59f5 | 1545 | void |
1546 | session_input_channel_req(int id, void *arg) | |
1547 | { | |
1548 | unsigned int len; | |
1549 | int reply; | |
1550 | int success = 0; | |
1551 | char *rtype; | |
1552 | Session *s; | |
1553 | Channel *c; | |
1554 | ||
1555 | rtype = packet_get_string(&len); | |
1556 | reply = packet_get_char(); | |
1557 | ||
1558 | s = session_by_channel(id); | |
1559 | if (s == NULL) | |
1560 | fatal("session_input_channel_req: channel %d: no session", id); | |
1561 | c = channel_lookup(id); | |
1562 | if (c == NULL) | |
1563 | fatal("session_input_channel_req: channel %d: bad channel", id); | |
1564 | ||
1565 | debug("session_input_channel_req: session %d channel %d request %s reply %d", | |
1566 | s->self, id, rtype, reply); | |
1567 | ||
1568 | /* | |
1569 | * a session is in LARVAL state until a shell | |
1570 | * or programm is executed | |
1571 | */ | |
1572 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1573 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1574 | success = session_shell_req(s); |
e78a59f5 | 1575 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1576 | success = session_exec_req(s); |
e78a59f5 | 1577 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1578 | success = session_pty_req(s); |
0b242b12 | 1579 | } else if (strcmp(rtype, "x11-req") == 0) { |
1580 | success = session_x11_req(s); | |
1581 | } else if (strcmp(rtype, "subsystem") == 0) { | |
1582 | success = session_subsystem_req(s); | |
e78a59f5 | 1583 | } |
1584 | } | |
1585 | if (strcmp(rtype, "window-change") == 0) { | |
1586 | success = session_window_change_req(s); | |
1587 | } | |
1588 | ||
1589 | if (reply) { | |
1590 | packet_start(success ? | |
1591 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1592 | packet_put_int(c->remote_id); | |
1593 | packet_send(); | |
1594 | } | |
1595 | xfree(rtype); | |
1596 | } | |
1597 | ||
1598 | void | |
1599 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1600 | { | |
1601 | if (!compat20) | |
1602 | fatal("session_set_fds: called for proto != 2.0"); | |
1603 | /* | |
1604 | * now that have a child and a pipe to the child, | |
1605 | * we can activate our channel and register the fd's | |
1606 | */ | |
1607 | if (s->chanid == -1) | |
1608 | fatal("no channel for session %d", s->self); | |
1609 | channel_set_fds(s->chanid, | |
1610 | fdout, fdin, fderr, | |
1611 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ); | |
1612 | } | |
1613 | ||
7368a6c8 | 1614 | void |
1615 | session_pty_cleanup(Session *s) | |
1616 | { | |
1617 | if (s == NULL || s->ttyfd == -1) | |
1618 | return; | |
1619 | ||
1620 | debug("session_pty_cleanup: session %i release %s", s->self, s->tty); | |
1621 | ||
1622 | /* Cancel the cleanup function. */ | |
1623 | fatal_remove_cleanup(pty_cleanup_proc, (void *)s); | |
1624 | ||
1625 | /* Record that the user has logged out. */ | |
1626 | record_logout(s->pid, s->tty); | |
1627 | ||
1628 | /* Release the pseudo-tty. */ | |
1629 | pty_release(s->tty); | |
1630 | ||
1631 | /* | |
1632 | * Close the server side of the socket pairs. We must do this after | |
1633 | * the pty cleanup, so that another process doesn't get this pty | |
1634 | * while we're still cleaning up. | |
1635 | */ | |
1636 | if (close(s->ptymaster) < 0) | |
1637 | error("close(s->ptymaster): %s", strerror(errno)); | |
1638 | } | |
e78a59f5 | 1639 | |
1640 | void | |
1641 | session_exit_message(Session *s, int status) | |
1642 | { | |
1643 | Channel *c; | |
1644 | if (s == NULL) | |
1645 | fatal("session_close: no session"); | |
1646 | c = channel_lookup(s->chanid); | |
1647 | if (c == NULL) | |
1648 | fatal("session_close: session %d: no channel %d", | |
1649 | s->self, s->chanid); | |
1650 | debug("session_exit_message: session %d channel %d pid %d", | |
1651 | s->self, s->chanid, s->pid); | |
1652 | ||
1653 | if (WIFEXITED(status)) { | |
1654 | channel_request_start(s->chanid, | |
1655 | "exit-status", 0); | |
1656 | packet_put_int(WEXITSTATUS(status)); | |
1657 | packet_send(); | |
1658 | } else if (WIFSIGNALED(status)) { | |
1659 | channel_request_start(s->chanid, | |
1660 | "exit-signal", 0); | |
1661 | packet_put_int(WTERMSIG(status)); | |
a64009ad | 1662 | #ifdef WCOREDUMP |
e78a59f5 | 1663 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1664 | #else /* WCOREDUMP */ |
1665 | packet_put_char(0); | |
1666 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1667 | packet_put_cstring(""); |
1668 | packet_put_cstring(""); | |
1669 | packet_send(); | |
1670 | } else { | |
1671 | /* Some weird exit cause. Just exit. */ | |
1672 | packet_disconnect("wait returned status %04x.", status); | |
1673 | } | |
1674 | ||
1675 | /* disconnect channel */ | |
1676 | debug("session_exit_message: release channel %d", s->chanid); | |
1677 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1678 | /* |
1679 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1680 | * interested in data we write. | |
1681 | * Note that we must not call 'chan_read_failed', since there could | |
1682 | * be some more data waiting in the pipe. | |
1683 | */ | |
0b242b12 | 1684 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1685 | chan_write_failed(c); | |
e78a59f5 | 1686 | s->chanid = -1; |
1687 | } | |
1688 | ||
1689 | void | |
1690 | session_free(Session *s) | |
1691 | { | |
1692 | debug("session_free: session %d pid %d", s->self, s->pid); | |
1693 | if (s->term) | |
1694 | xfree(s->term); | |
1695 | if (s->display) | |
1696 | xfree(s->display); | |
1697 | if (s->auth_data) | |
1698 | xfree(s->auth_data); | |
1699 | if (s->auth_proto) | |
1700 | xfree(s->auth_proto); | |
1701 | s->used = 0; | |
1702 | } | |
1703 | ||
1704 | void | |
1705 | session_close(Session *s) | |
1706 | { | |
1707 | session_pty_cleanup(s); | |
1708 | session_free(s); | |
1d1ffb87 | 1709 | session_proctitle(s); |
e78a59f5 | 1710 | } |
1711 | ||
1712 | void | |
1713 | session_close_by_pid(pid_t pid, int status) | |
1714 | { | |
1715 | Session *s = session_by_pid(pid); | |
1716 | if (s == NULL) { | |
1717 | debug("session_close_by_pid: no session for pid %d", s->pid); | |
1718 | return; | |
1719 | } | |
1720 | if (s->chanid != -1) | |
1721 | session_exit_message(s, status); | |
1722 | session_close(s); | |
1723 | } | |
1724 | ||
1725 | /* | |
1726 | * this is called when a channel dies before | |
1727 | * the session 'child' itself dies | |
1728 | */ | |
1729 | void | |
1730 | session_close_by_channel(int id, void *arg) | |
1731 | { | |
1732 | Session *s = session_by_channel(id); | |
1733 | if (s == NULL) { | |
1734 | debug("session_close_by_channel: no session for channel %d", id); | |
1735 | return; | |
1736 | } | |
1737 | /* disconnect channel */ | |
1738 | channel_cancel_cleanup(s->chanid); | |
1739 | s->chanid = -1; | |
1740 | ||
1741 | debug("session_close_by_channel: channel %d kill %d", id, s->pid); | |
1742 | if (s->pid == 0) { | |
1743 | /* close session immediately */ | |
1744 | session_close(s); | |
1745 | } else { | |
1746 | /* notify child, delay session cleanup */ | |
f528fdf2 | 1747 | if (s->pid <= 1) |
512ad3c0 | 1748 | fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid); |
1749 | if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0) | |
e78a59f5 | 1750 | error("session_close_by_channel: kill %d: %s", |
1751 | s->pid, strerror(errno)); | |
1752 | } | |
1753 | } | |
1754 | ||
1d1ffb87 | 1755 | char * |
1756 | session_tty_list(void) | |
1757 | { | |
1758 | static char buf[1024]; | |
1759 | int i; | |
1760 | buf[0] = '\0'; | |
1761 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1762 | Session *s = &sessions[i]; | |
1763 | if (s->used && s->ttyfd != -1) { | |
1764 | if (buf[0] != '\0') | |
1765 | strlcat(buf, ",", sizeof buf); | |
1766 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1767 | } | |
1768 | } | |
1769 | if (buf[0] == '\0') | |
1770 | strlcpy(buf, "notty", sizeof buf); | |
1771 | return buf; | |
1772 | } | |
1773 | ||
1774 | void | |
1775 | session_proctitle(Session *s) | |
1776 | { | |
1777 | if (s->pw == NULL) | |
1778 | error("no user for session %d", s->self); | |
1779 | else | |
1780 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
1781 | } | |
1782 | ||
e78a59f5 | 1783 | void |
1784 | do_authenticated2(void) | |
1785 | { | |
1786 | /* | |
1787 | * Cancel the alarm we set to limit the time taken for | |
1788 | * authentication. | |
1789 | */ | |
1790 | alarm(0); | |
e78a59f5 | 1791 | server_loop2(); |
34bce9a5 | 1792 | if (xauthfile) |
1793 | xauthfile_cleanup_proc(NULL); | |
e78a59f5 | 1794 | } |