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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" | |
3f7a7e4a | 11 | RCSID("$OpenBSD: session.c,v 1.23 2000/07/11 08:11:33 deraadt Exp $"); |
7368a6c8 | 12 | |
13 | #include "xmalloc.h" | |
14 | #include "ssh.h" | |
15 | #include "pty.h" | |
16 | #include "packet.h" | |
17 | #include "buffer.h" | |
18 | #include "cipher.h" | |
19 | #include "mpaux.h" | |
20 | #include "servconf.h" | |
21 | #include "uidswap.h" | |
22 | #include "compat.h" | |
23 | #include "channels.h" | |
24 | #include "nchan.h" | |
25 | ||
e78a59f5 | 26 | #include "bufaux.h" |
27 | #include "ssh2.h" | |
28 | #include "auth.h" | |
38c295d6 | 29 | #include "auth-options.h" |
e78a59f5 | 30 | |
3206bb3b | 31 | #ifdef WITH_IRIX_PROJECT |
32 | #include <proj.h> | |
33 | #endif /* WITH_IRIX_PROJECT */ | |
34 | ||
089fbbd2 | 35 | #if defined(HAVE_USERSEC_H) |
36 | #include <usersec.h> | |
37 | #endif | |
38 | ||
4d33e531 | 39 | #ifdef HAVE_OSF_SIA |
40 | # include <sia.h> | |
41 | # include <siad.h> | |
42 | #endif | |
43 | ||
3fcce26c | 44 | /* AIX limits */ |
45 | #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE) | |
46 | # define S_UFSIZE_HARD S_UFSIZE | |
47 | # define S_UCPU_HARD S_UCPU | |
48 | # define S_UDATA_HARD S_UDATA | |
49 | # define S_USTACK_HARD S_USTACK | |
50 | # define S_URSS_HARD S_URSS | |
51 | # define S_UCORE_HARD S_UCORE | |
52 | #endif | |
53 | ||
7368a6c8 | 54 | /* types */ |
55 | ||
56 | #define TTYSZ 64 | |
57 | typedef struct Session Session; | |
58 | struct Session { | |
59 | int used; | |
60 | int self; | |
0b242b12 | 61 | int extended; |
7368a6c8 | 62 | struct passwd *pw; |
63 | pid_t pid; | |
64 | /* tty */ | |
65 | char *term; | |
66 | int ptyfd, ttyfd, ptymaster; | |
67 | int row, col, xpixel, ypixel; | |
68 | char tty[TTYSZ]; | |
69 | /* X11 */ | |
70 | char *display; | |
71 | int screen; | |
72 | char *auth_proto; | |
73 | char *auth_data; | |
0b242b12 | 74 | int single_connection; |
7368a6c8 | 75 | /* proto 2 */ |
76 | int chanid; | |
77 | }; | |
78 | ||
79 | /* func */ | |
80 | ||
81 | Session *session_new(void); | |
82 | void session_set_fds(Session *s, int fdin, int fdout, int fderr); | |
83 | void session_pty_cleanup(Session *s); | |
1d1ffb87 | 84 | void session_proctitle(Session *s); |
7368a6c8 | 85 | void do_exec_pty(Session *s, const char *command, struct passwd * pw); |
86 | void do_exec_no_pty(Session *s, const char *command, struct passwd * pw); | |
87 | ||
88 | void | |
89 | do_child(const char *command, struct passwd * pw, const char *term, | |
90 | const char *display, const char *auth_proto, | |
91 | const char *auth_data, const char *ttyname); | |
92 | ||
93 | /* import */ | |
94 | extern ServerOptions options; | |
3a6cb538 | 95 | #ifdef HAVE___PROGNAME |
7368a6c8 | 96 | extern char *__progname; |
3a6cb538 | 97 | #else /* HAVE___PROGNAME */ |
3fd95d9a | 98 | static const char *__progname = "sshd"; |
3a6cb538 | 99 | #endif /* HAVE___PROGNAME */ |
100 | ||
7368a6c8 | 101 | extern int log_stderr; |
102 | extern int debug_flag; | |
103 | ||
089fbbd2 | 104 | extern int startup_pipe; |
105 | ||
7368a6c8 | 106 | /* Local Xauthority file. */ |
107 | static char *xauthfile; | |
108 | ||
109 | /* data */ | |
110 | #define MAX_SESSIONS 10 | |
111 | Session sessions[MAX_SESSIONS]; | |
c1ef8333 | 112 | #ifdef WITH_AIXAUTHENTICATE |
113 | /* AIX's lastlogin message, set in auth1.c */ | |
114 | char *aixloginmsg; | |
115 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 116 | |
7368a6c8 | 117 | /* |
118 | * Remove local Xauthority file. | |
119 | */ | |
120 | void | |
121 | xauthfile_cleanup_proc(void *ignore) | |
122 | { | |
123 | debug("xauthfile_cleanup_proc called"); | |
124 | ||
125 | if (xauthfile != NULL) { | |
126 | char *p; | |
127 | unlink(xauthfile); | |
128 | p = strrchr(xauthfile, '/'); | |
129 | if (p != NULL) { | |
130 | *p = '\0'; | |
131 | rmdir(xauthfile); | |
132 | } | |
133 | xfree(xauthfile); | |
134 | xauthfile = NULL; | |
135 | } | |
136 | } | |
137 | ||
138 | /* | |
139 | * Function to perform cleanup if we get aborted abnormally (e.g., due to a | |
140 | * dropped connection). | |
141 | */ | |
6ae2364d | 142 | void |
7368a6c8 | 143 | pty_cleanup_proc(void *session) |
144 | { | |
145 | Session *s=session; | |
146 | if (s == NULL) | |
147 | fatal("pty_cleanup_proc: no session"); | |
148 | debug("pty_cleanup_proc: %s", s->tty); | |
149 | ||
150 | if (s->pid != 0) { | |
151 | /* Record that the user has logged out. */ | |
152 | record_logout(s->pid, s->tty); | |
153 | } | |
154 | ||
155 | /* Release the pseudo-tty. */ | |
156 | pty_release(s->tty); | |
157 | } | |
158 | ||
159 | /* | |
160 | * Prepares for an interactive session. This is called after the user has | |
161 | * been successfully authenticated. During this message exchange, pseudo | |
162 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
163 | * are requested, etc. | |
164 | */ | |
6ae2364d | 165 | void |
7368a6c8 | 166 | do_authenticated(struct passwd * pw) |
167 | { | |
168 | Session *s; | |
169 | int type; | |
170 | int compression_level = 0, enable_compression_after_reply = 0; | |
171 | int have_pty = 0; | |
172 | char *command; | |
173 | int n_bytes; | |
174 | int plen; | |
175 | unsigned int proto_len, data_len, dlen; | |
176 | ||
177 | /* | |
178 | * Cancel the alarm we set to limit the time taken for | |
179 | * authentication. | |
180 | */ | |
181 | alarm(0); | |
3f7a7e4a | 182 | if (startup_pipe != -1) { |
5540ea9b | 183 | close(startup_pipe); |
3f7a7e4a | 184 | startup_pipe = -1; |
185 | } | |
7368a6c8 | 186 | |
187 | /* | |
188 | * Inform the channel mechanism that we are the server side and that | |
189 | * the client may request to connect to any port at all. (The user | |
190 | * could do it anyway, and we wouldn\'t know what is permitted except | |
191 | * by the client telling us, so we can equally well trust the client | |
192 | * not to request anything bogus.) | |
193 | */ | |
194 | if (!no_port_forwarding_flag) | |
195 | channel_permit_all_opens(); | |
196 | ||
197 | s = session_new(); | |
0b242b12 | 198 | s->pw = pw; |
7368a6c8 | 199 | |
200 | /* | |
201 | * We stay in this loop until the client requests to execute a shell | |
202 | * or a command. | |
203 | */ | |
204 | for (;;) { | |
205 | int success = 0; | |
206 | ||
207 | /* Get a packet from the client. */ | |
208 | type = packet_read(&plen); | |
209 | ||
210 | /* Process the packet. */ | |
211 | switch (type) { | |
212 | case SSH_CMSG_REQUEST_COMPRESSION: | |
213 | packet_integrity_check(plen, 4, type); | |
214 | compression_level = packet_get_int(); | |
215 | if (compression_level < 1 || compression_level > 9) { | |
216 | packet_send_debug("Received illegal compression level %d.", | |
217 | compression_level); | |
218 | break; | |
219 | } | |
220 | /* Enable compression after we have responded with SUCCESS. */ | |
221 | enable_compression_after_reply = 1; | |
222 | success = 1; | |
223 | break; | |
224 | ||
225 | case SSH_CMSG_REQUEST_PTY: | |
226 | if (no_pty_flag) { | |
227 | debug("Allocating a pty not permitted for this authentication."); | |
228 | break; | |
229 | } | |
230 | if (have_pty) | |
231 | packet_disconnect("Protocol error: you already have a pty."); | |
232 | ||
233 | debug("Allocating pty."); | |
234 | ||
235 | /* Allocate a pty and open it. */ | |
236 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, | |
237 | sizeof(s->tty))) { | |
238 | error("Failed to allocate pty."); | |
239 | break; | |
240 | } | |
241 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
242 | pty_setowner(pw, s->tty); | |
243 | ||
244 | /* Get TERM from the packet. Note that the value may be of arbitrary length. */ | |
245 | s->term = packet_get_string(&dlen); | |
246 | packet_integrity_check(dlen, strlen(s->term), type); | |
247 | /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */ | |
248 | /* Remaining bytes */ | |
249 | n_bytes = plen - (4 + dlen + 4 * 4); | |
250 | ||
251 | if (strcmp(s->term, "") == 0) { | |
252 | xfree(s->term); | |
253 | s->term = NULL; | |
254 | } | |
255 | /* Get window size from the packet. */ | |
256 | s->row = packet_get_int(); | |
257 | s->col = packet_get_int(); | |
258 | s->xpixel = packet_get_int(); | |
259 | s->ypixel = packet_get_int(); | |
260 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
261 | ||
262 | /* Get tty modes from the packet. */ | |
263 | tty_parse_modes(s->ttyfd, &n_bytes); | |
264 | packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type); | |
265 | ||
1d1ffb87 | 266 | session_proctitle(s); |
267 | ||
7368a6c8 | 268 | /* Indicate that we now have a pty. */ |
269 | success = 1; | |
270 | have_pty = 1; | |
271 | break; | |
272 | ||
273 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
274 | if (!options.x11_forwarding) { | |
275 | packet_send_debug("X11 forwarding disabled in server configuration file."); | |
276 | break; | |
277 | } | |
6fc1e9f3 | 278 | if (!options.xauth_location) { |
279 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
280 | break; | |
281 | } | |
7368a6c8 | 282 | if (no_x11_forwarding_flag) { |
283 | packet_send_debug("X11 forwarding not permitted for this authentication."); | |
284 | break; | |
285 | } | |
286 | debug("Received request for X11 forwarding with auth spoofing."); | |
287 | if (s->display != NULL) | |
288 | packet_disconnect("Protocol error: X11 display already set."); | |
289 | ||
290 | s->auth_proto = packet_get_string(&proto_len); | |
291 | s->auth_data = packet_get_string(&data_len); | |
292 | packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type); | |
293 | ||
294 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER) | |
295 | s->screen = packet_get_int(); | |
296 | else | |
297 | s->screen = 0; | |
298 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
299 | ||
300 | if (s->display == NULL) | |
301 | break; | |
302 | ||
303 | /* Setup to always have a local .Xauthority. */ | |
304 | xauthfile = xmalloc(MAXPATHLEN); | |
305 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
306 | temporarily_use_uid(pw->pw_uid); | |
307 | if (mkdtemp(xauthfile) == NULL) { | |
308 | restore_uid(); | |
309 | error("private X11 dir: mkdtemp %s failed: %s", | |
310 | xauthfile, strerror(errno)); | |
311 | xfree(xauthfile); | |
312 | xauthfile = NULL; | |
0b242b12 | 313 | /* XXXX remove listening channels */ |
7368a6c8 | 314 | break; |
315 | } | |
316 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
317 | open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); | |
318 | restore_uid(); | |
319 | fatal_add_cleanup(xauthfile_cleanup_proc, NULL); | |
320 | success = 1; | |
321 | break; | |
7368a6c8 | 322 | |
323 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
324 | if (no_agent_forwarding_flag || compat13) { | |
325 | debug("Authentication agent forwarding not permitted for this authentication."); | |
326 | break; | |
327 | } | |
328 | debug("Received authentication agent forwarding request."); | |
6fc1e9f3 | 329 | success = auth_input_request_forwarding(pw); |
7368a6c8 | 330 | break; |
331 | ||
332 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
333 | if (no_port_forwarding_flag) { | |
334 | debug("Port forwarding not permitted for this authentication."); | |
335 | break; | |
336 | } | |
337 | debug("Received TCP/IP port forwarding request."); | |
1d1ffb87 | 338 | channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 339 | success = 1; |
340 | break; | |
341 | ||
342 | case SSH_CMSG_MAX_PACKET_SIZE: | |
343 | if (packet_set_maxsize(packet_get_int()) > 0) | |
344 | success = 1; | |
345 | break; | |
346 | ||
347 | case SSH_CMSG_EXEC_SHELL: | |
348 | case SSH_CMSG_EXEC_CMD: | |
349 | /* Set interactive/non-interactive mode. */ | |
350 | packet_set_interactive(have_pty || s->display != NULL, | |
351 | options.keepalives); | |
352 | ||
353 | if (type == SSH_CMSG_EXEC_CMD) { | |
354 | command = packet_get_string(&dlen); | |
355 | debug("Exec command '%.500s'", command); | |
356 | packet_integrity_check(plen, 4 + dlen, type); | |
357 | } else { | |
358 | command = NULL; | |
359 | packet_integrity_check(plen, 0, type); | |
360 | } | |
361 | if (forced_command != NULL) { | |
362 | command = forced_command; | |
363 | debug("Forced command '%.500s'", forced_command); | |
364 | } | |
365 | if (have_pty) | |
366 | do_exec_pty(s, command, pw); | |
367 | else | |
368 | do_exec_no_pty(s, command, pw); | |
369 | ||
370 | if (command != NULL) | |
371 | xfree(command); | |
372 | /* Cleanup user's local Xauthority file. */ | |
373 | if (xauthfile) | |
374 | xauthfile_cleanup_proc(NULL); | |
375 | return; | |
376 | ||
377 | default: | |
378 | /* | |
379 | * Any unknown messages in this phase are ignored, | |
380 | * and a failure message is returned. | |
381 | */ | |
382 | log("Unknown packet type received after authentication: %d", type); | |
383 | } | |
384 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
385 | packet_send(); | |
386 | packet_write_wait(); | |
387 | ||
388 | /* Enable compression now that we have replied if appropriate. */ | |
389 | if (enable_compression_after_reply) { | |
390 | enable_compression_after_reply = 0; | |
391 | packet_start_compression(compression_level); | |
392 | } | |
393 | } | |
394 | } | |
395 | ||
396 | /* | |
397 | * This is called to fork and execute a command when we have no tty. This | |
398 | * will call do_child from the child, and server_loop from the parent after | |
399 | * setting up file descriptors and such. | |
400 | */ | |
6ae2364d | 401 | void |
7368a6c8 | 402 | do_exec_no_pty(Session *s, const char *command, struct passwd * pw) |
403 | { | |
404 | int pid; | |
405 | ||
406 | #ifdef USE_PIPES | |
407 | int pin[2], pout[2], perr[2]; | |
408 | /* Allocate pipes for communicating with the program. */ | |
409 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
410 | packet_disconnect("Could not create pipes: %.100s", | |
411 | strerror(errno)); | |
412 | #else /* USE_PIPES */ | |
413 | int inout[2], err[2]; | |
414 | /* Uses socket pairs to communicate with the program. */ | |
415 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
416 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
417 | packet_disconnect("Could not create socket pairs: %.100s", | |
418 | strerror(errno)); | |
419 | #endif /* USE_PIPES */ | |
420 | if (s == NULL) | |
421 | fatal("do_exec_no_pty: no session"); | |
422 | ||
1d1ffb87 | 423 | session_proctitle(s); |
7368a6c8 | 424 | |
425 | #ifdef USE_PAM | |
426 | do_pam_setcred(); | |
427 | #endif /* USE_PAM */ | |
428 | ||
429 | /* Fork the child. */ | |
430 | if ((pid = fork()) == 0) { | |
431 | /* Child. Reinitialize the log since the pid has changed. */ | |
432 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
433 | ||
434 | /* | |
435 | * Create a new session and process group since the 4.4BSD | |
436 | * setlogin() affects the entire process group. | |
437 | */ | |
438 | if (setsid() < 0) | |
439 | error("setsid failed: %.100s", strerror(errno)); | |
440 | ||
441 | #ifdef USE_PIPES | |
442 | /* | |
443 | * Redirect stdin. We close the parent side of the socket | |
444 | * pair, and make the child side the standard input. | |
445 | */ | |
446 | close(pin[1]); | |
447 | if (dup2(pin[0], 0) < 0) | |
448 | perror("dup2 stdin"); | |
449 | close(pin[0]); | |
450 | ||
451 | /* Redirect stdout. */ | |
452 | close(pout[0]); | |
453 | if (dup2(pout[1], 1) < 0) | |
454 | perror("dup2 stdout"); | |
455 | close(pout[1]); | |
456 | ||
457 | /* Redirect stderr. */ | |
458 | close(perr[0]); | |
459 | if (dup2(perr[1], 2) < 0) | |
460 | perror("dup2 stderr"); | |
461 | close(perr[1]); | |
462 | #else /* USE_PIPES */ | |
463 | /* | |
464 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
465 | * use the same socket, as some programs (particularly rdist) | |
466 | * seem to depend on it. | |
467 | */ | |
468 | close(inout[1]); | |
469 | close(err[1]); | |
470 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
471 | perror("dup2 stdin"); | |
472 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
473 | perror("dup2 stdout"); | |
474 | if (dup2(err[0], 2) < 0) /* stderr */ | |
475 | perror("dup2 stderr"); | |
476 | #endif /* USE_PIPES */ | |
477 | ||
478 | /* Do processing for the child (exec command etc). */ | |
479 | do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL); | |
480 | /* NOTREACHED */ | |
481 | } | |
482 | if (pid < 0) | |
483 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
484 | s->pid = pid; | |
485 | #ifdef USE_PIPES | |
486 | /* We are the parent. Close the child sides of the pipes. */ | |
487 | close(pin[0]); | |
488 | close(pout[1]); | |
489 | close(perr[1]); | |
490 | ||
e78a59f5 | 491 | if (compat20) { |
0b242b12 | 492 | session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1); |
e78a59f5 | 493 | } else { |
494 | /* Enter the interactive session. */ | |
495 | server_loop(pid, pin[1], pout[0], perr[0]); | |
496 | /* server_loop has closed pin[1], pout[1], and perr[1]. */ | |
497 | } | |
7368a6c8 | 498 | #else /* USE_PIPES */ |
499 | /* We are the parent. Close the child sides of the socket pairs. */ | |
500 | close(inout[0]); | |
501 | close(err[0]); | |
502 | ||
503 | /* | |
504 | * Enter the interactive session. Note: server_loop must be able to | |
505 | * handle the case that fdin and fdout are the same. | |
506 | */ | |
e78a59f5 | 507 | if (compat20) { |
0b242b12 | 508 | session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1); |
e78a59f5 | 509 | } else { |
510 | server_loop(pid, inout[1], inout[1], err[1]); | |
511 | /* server_loop has closed inout[1] and err[1]. */ | |
512 | } | |
7368a6c8 | 513 | #endif /* USE_PIPES */ |
514 | } | |
515 | ||
516 | /* | |
517 | * This is called to fork and execute a command when we have a tty. This | |
518 | * will call do_child from the child, and server_loop from the parent after | |
519 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
520 | * lastlog, and other such operations. | |
521 | */ | |
6ae2364d | 522 | void |
7368a6c8 | 523 | do_exec_pty(Session *s, const char *command, struct passwd * pw) |
524 | { | |
525 | FILE *f; | |
526 | char buf[100], *time_string; | |
527 | char line[256]; | |
528 | const char *hostname; | |
529 | int fdout, ptyfd, ttyfd, ptymaster; | |
530 | int quiet_login; | |
531 | pid_t pid; | |
532 | socklen_t fromlen; | |
533 | struct sockaddr_storage from; | |
534 | struct stat st; | |
535 | time_t last_login_time; | |
536 | ||
537 | if (s == NULL) | |
538 | fatal("do_exec_pty: no session"); | |
539 | ptyfd = s->ptyfd; | |
540 | ttyfd = s->ttyfd; | |
541 | ||
542 | /* Get remote host name. */ | |
543 | hostname = get_canonical_hostname(); | |
544 | ||
545 | /* | |
546 | * Get the time when the user last logged in. Buf will be set to | |
547 | * contain the hostname the last login was from. | |
548 | */ | |
549 | if (!options.use_login) { | |
550 | last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name, | |
551 | buf, sizeof(buf)); | |
552 | } | |
7368a6c8 | 553 | |
554 | #ifdef USE_PAM | |
555 | do_pam_session(pw->pw_name, s->tty); | |
556 | do_pam_setcred(); | |
557 | #endif /* USE_PAM */ | |
558 | ||
559 | /* Fork the child. */ | |
560 | if ((pid = fork()) == 0) { | |
561 | pid = getpid(); | |
562 | ||
563 | /* Child. Reinitialize the log because the pid has | |
564 | changed. */ | |
565 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
566 | ||
567 | /* Close the master side of the pseudo tty. */ | |
568 | close(ptyfd); | |
569 | ||
570 | /* Make the pseudo tty our controlling tty. */ | |
571 | pty_make_controlling_tty(&ttyfd, s->tty); | |
572 | ||
573 | /* Redirect stdin from the pseudo tty. */ | |
574 | if (dup2(ttyfd, fileno(stdin)) < 0) | |
575 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
576 | ||
577 | /* Redirect stdout to the pseudo tty. */ | |
578 | if (dup2(ttyfd, fileno(stdout)) < 0) | |
579 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
580 | ||
581 | /* Redirect stderr to the pseudo tty. */ | |
582 | if (dup2(ttyfd, fileno(stderr)) < 0) | |
583 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
584 | ||
585 | /* Close the extra descriptor for the pseudo tty. */ | |
586 | close(ttyfd); | |
587 | ||
1d1ffb87 | 588 | /* XXXX ? move to do_child() ??*/ |
7368a6c8 | 589 | /* |
590 | * Get IP address of client. This is needed because we want | |
591 | * to record where the user logged in from. If the | |
592 | * connection is not a socket, let the ip address be 0.0.0.0. | |
593 | */ | |
594 | memset(&from, 0, sizeof(from)); | |
595 | if (packet_connection_is_on_socket()) { | |
596 | fromlen = sizeof(from); | |
597 | if (getpeername(packet_get_connection_in(), | |
598 | (struct sockaddr *) & from, &fromlen) < 0) { | |
599 | debug("getpeername: %.100s", strerror(errno)); | |
600 | fatal_cleanup(); | |
601 | } | |
602 | } | |
603 | /* Record that there was a login on that terminal. */ | |
dbaa2e87 | 604 | if (!options.use_login || command != NULL) |
605 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
606 | hostname, (struct sockaddr *)&from); | |
7368a6c8 | 607 | |
608 | /* Check if .hushlogin exists. */ | |
609 | snprintf(line, sizeof line, "%.200s/.hushlogin", pw->pw_dir); | |
610 | quiet_login = stat(line, &st) >= 0; | |
611 | ||
612 | #ifdef USE_PAM | |
613 | if (!quiet_login) | |
614 | print_pam_messages(); | |
615 | #endif /* USE_PAM */ | |
616 | ||
617 | /* | |
618 | * If the user has logged in before, display the time of last | |
619 | * login. However, don't display anything extra if a command | |
620 | * has been specified (so that ssh can be used to execute | |
621 | * commands on a remote machine without users knowing they | |
622 | * are going to another machine). Login(1) will do this for | |
623 | * us as well, so check if login(1) is used | |
624 | */ | |
625 | if (command == NULL && last_login_time != 0 && !quiet_login && | |
626 | !options.use_login) { | |
627 | /* Convert the date to a string. */ | |
628 | time_string = ctime(&last_login_time); | |
629 | /* Remove the trailing newline. */ | |
630 | if (strchr(time_string, '\n')) | |
631 | *strchr(time_string, '\n') = 0; | |
632 | /* Display the last login time. Host if displayed | |
633 | if known. */ | |
634 | if (strcmp(buf, "") == 0) | |
635 | printf("Last login: %s\r\n", time_string); | |
636 | else | |
637 | printf("Last login: %s from %s\r\n", time_string, buf); | |
638 | } | |
639 | /* | |
640 | * Print /etc/motd unless a command was specified or printing | |
641 | * it was disabled in server options or login(1) will be | |
642 | * used. Note that some machines appear to print it in | |
643 | * /etc/profile or similar. | |
644 | */ | |
645 | if (command == NULL && options.print_motd && !quiet_login && | |
646 | !options.use_login) { | |
647 | /* Print /etc/motd if it exists. */ | |
648 | f = fopen("/etc/motd", "r"); | |
649 | if (f) { | |
650 | while (fgets(line, sizeof(line), f)) | |
651 | fputs(line, stdout); | |
652 | fclose(f); | |
653 | } | |
654 | } | |
c1ef8333 | 655 | #if defined(WITH_AIXAUTHENTICATE) |
656 | /* | |
657 | * AIX handles the lastlog info differently. Display it here. | |
658 | */ | |
659 | if (command == NULL && aixloginmsg && *aixloginmsg && | |
660 | !quiet_login && !options.use_login) { | |
661 | printf("%s\n", aixloginmsg); | |
662 | } | |
663 | #endif | |
7368a6c8 | 664 | /* Do common processing for the child, such as execing the command. */ |
71276795 | 665 | do_child(command, pw, s->term, s->display, s->auth_proto, |
666 | s->auth_data, s->tty); | |
7368a6c8 | 667 | /* NOTREACHED */ |
668 | } | |
669 | if (pid < 0) | |
670 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
671 | s->pid = pid; | |
672 | ||
673 | /* Parent. Close the slave side of the pseudo tty. */ | |
674 | close(ttyfd); | |
675 | ||
676 | /* | |
677 | * Create another descriptor of the pty master side for use as the | |
678 | * standard input. We could use the original descriptor, but this | |
679 | * simplifies code in server_loop. The descriptor is bidirectional. | |
680 | */ | |
681 | fdout = dup(ptyfd); | |
682 | if (fdout < 0) | |
683 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
684 | ||
685 | /* we keep a reference to the pty master */ | |
686 | ptymaster = dup(ptyfd); | |
687 | if (ptymaster < 0) | |
688 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
689 | s->ptymaster = ptymaster; | |
690 | ||
691 | /* Enter interactive session. */ | |
e78a59f5 | 692 | if (compat20) { |
693 | session_set_fds(s, ptyfd, fdout, -1); | |
694 | } else { | |
695 | server_loop(pid, ptyfd, fdout, -1); | |
696 | /* server_loop _has_ closed ptyfd and fdout. */ | |
697 | session_pty_cleanup(s); | |
698 | } | |
7368a6c8 | 699 | } |
700 | ||
701 | /* | |
702 | * Sets the value of the given variable in the environment. If the variable | |
703 | * already exists, its value is overriden. | |
704 | */ | |
6ae2364d | 705 | void |
7368a6c8 | 706 | child_set_env(char ***envp, unsigned int *envsizep, const char *name, |
707 | const char *value) | |
708 | { | |
709 | unsigned int i, namelen; | |
710 | char **env; | |
711 | ||
712 | /* | |
713 | * Find the slot where the value should be stored. If the variable | |
714 | * already exists, we reuse the slot; otherwise we append a new slot | |
715 | * at the end of the array, expanding if necessary. | |
716 | */ | |
717 | env = *envp; | |
718 | namelen = strlen(name); | |
719 | for (i = 0; env[i]; i++) | |
720 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
721 | break; | |
722 | if (env[i]) { | |
723 | /* Reuse the slot. */ | |
724 | xfree(env[i]); | |
725 | } else { | |
726 | /* New variable. Expand if necessary. */ | |
727 | if (i >= (*envsizep) - 1) { | |
728 | (*envsizep) += 50; | |
729 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
730 | } | |
731 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
732 | env[i + 1] = NULL; | |
733 | } | |
734 | ||
735 | /* Allocate space and format the variable in the appropriate slot. */ | |
736 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
737 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
738 | } | |
739 | ||
740 | /* | |
741 | * Reads environment variables from the given file and adds/overrides them | |
742 | * into the environment. If the file does not exist, this does nothing. | |
743 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
744 | * and assignments of the form name=value. No other forms are allowed. | |
745 | */ | |
6ae2364d | 746 | void |
7368a6c8 | 747 | read_environment_file(char ***env, unsigned int *envsize, |
748 | const char *filename) | |
749 | { | |
750 | FILE *f; | |
751 | char buf[4096]; | |
752 | char *cp, *value; | |
753 | ||
754 | f = fopen(filename, "r"); | |
755 | if (!f) | |
756 | return; | |
757 | ||
758 | while (fgets(buf, sizeof(buf), f)) { | |
759 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
760 | ; | |
761 | if (!*cp || *cp == '#' || *cp == '\n') | |
762 | continue; | |
763 | if (strchr(cp, '\n')) | |
764 | *strchr(cp, '\n') = '\0'; | |
765 | value = strchr(cp, '='); | |
766 | if (value == NULL) { | |
767 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
768 | continue; | |
769 | } | |
71276795 | 770 | /* |
771 | * Replace the equals sign by nul, and advance value to | |
772 | * the value string. | |
773 | */ | |
7368a6c8 | 774 | *value = '\0'; |
775 | value++; | |
776 | child_set_env(env, envsize, cp, value); | |
777 | } | |
778 | fclose(f); | |
779 | } | |
780 | ||
781 | #ifdef USE_PAM | |
782 | /* | |
783 | * Sets any environment variables which have been specified by PAM | |
784 | */ | |
785 | void do_pam_environment(char ***env, int *envsize) | |
786 | { | |
787 | char *equals, var_name[512], var_val[512]; | |
788 | char **pam_env; | |
789 | int i; | |
790 | ||
791 | if ((pam_env = fetch_pam_environment()) == NULL) | |
792 | return; | |
793 | ||
794 | for(i = 0; pam_env[i] != NULL; i++) { | |
795 | if ((equals = strstr(pam_env[i], "=")) == NULL) | |
796 | continue; | |
797 | ||
798 | if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) { | |
799 | memset(var_name, '\0', sizeof(var_name)); | |
800 | memset(var_val, '\0', sizeof(var_val)); | |
801 | ||
802 | strncpy(var_name, pam_env[i], equals - pam_env[i]); | |
803 | strcpy(var_val, equals + 1); | |
804 | ||
805 | debug("PAM environment: %s=%s", var_name, var_val); | |
806 | ||
807 | child_set_env(env, envsize, var_name, var_val); | |
808 | } | |
809 | } | |
810 | } | |
811 | #endif /* USE_PAM */ | |
812 | ||
5fa45897 | 813 | #if defined(HAVE_GETUSERATTR) |
814 | /* | |
815 | * AIX-specific login initialisation | |
816 | */ | |
817 | void set_limit(char *user, char *soft, char *hard, int resource, int mult) | |
818 | { | |
819 | struct rlimit rlim; | |
56118702 | 820 | int slim, hlim; |
5fa45897 | 821 | |
822 | getrlimit(resource, &rlim); | |
823 | ||
56118702 | 824 | slim = 0; |
825 | if (getuserattr(user, soft, &slim, SEC_INT) != -1) { | |
826 | if (slim < 0) { | |
827 | rlim.rlim_cur = RLIM_INFINITY; | |
828 | } else if (slim != 0) { | |
829 | /* See the wackiness below */ | |
830 | if (rlim.rlim_cur == slim * mult) | |
831 | slim = 0; | |
832 | else | |
833 | rlim.rlim_cur = slim * mult; | |
834 | } | |
835 | } | |
5fa45897 | 836 | |
56118702 | 837 | hlim = 0; |
838 | if (getuserattr(user, hard, &hlim, SEC_INT) != -1) { | |
839 | if (hlim < 0) { | |
840 | rlim.rlim_max = RLIM_INFINITY; | |
841 | } else if (hlim != 0) { | |
842 | rlim.rlim_max = hlim * mult; | |
843 | } | |
844 | } | |
5fa45897 | 845 | |
56118702 | 846 | /* |
847 | * XXX For cpu and fsize the soft limit is set to the hard limit | |
848 | * if the hard limit is left at its default value and the soft limit | |
849 | * is changed from its default value, either by requesting it | |
850 | * (slim == 0) or by setting it to the current default. At least | |
851 | * that's how rlogind does it. If you're confused you're not alone. | |
852 | * Bug or feature? AIX 4.3.1.2 | |
853 | */ | |
854 | if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu")) | |
855 | && hlim == 0 && slim != 0) | |
856 | rlim.rlim_max = rlim.rlim_cur; | |
857 | /* A specified hard limit limits the soft limit */ | |
858 | else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max) | |
859 | rlim.rlim_cur = rlim.rlim_max; | |
860 | /* A soft limit can increase a hard limit */ | |
861 | else if (rlim.rlim_cur > rlim.rlim_max) | |
5fa45897 | 862 | rlim.rlim_max = rlim.rlim_cur; |
863 | ||
864 | if (setrlimit(resource, &rlim) != 0) | |
56118702 | 865 | error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno)); |
5fa45897 | 866 | } |
867 | ||
868 | void set_limits_from_userattr(char *user) | |
869 | { | |
870 | int mask; | |
871 | char buf[16]; | |
872 | ||
873 | set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512); | |
874 | set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1); | |
875 | set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512); | |
876 | set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512); | |
877 | set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512); | |
878 | set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512); | |
879 | #if defined(S_UNOFILE) | |
880 | set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1); | |
881 | #endif | |
882 | ||
883 | if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) { | |
884 | /* Convert decimal to octal */ | |
885 | (void) snprintf(buf, sizeof(buf), "%d", mask); | |
886 | if (sscanf(buf, "%o", &mask) == 1) | |
887 | umask(mask); | |
888 | } | |
889 | } | |
890 | #endif /* defined(HAVE_GETUSERATTR) */ | |
891 | ||
7368a6c8 | 892 | /* |
893 | * Performs common processing for the child, such as setting up the | |
894 | * environment, closing extra file descriptors, setting the user and group | |
895 | * ids, and executing the command or shell. | |
896 | */ | |
6ae2364d | 897 | void |
7368a6c8 | 898 | do_child(const char *command, struct passwd * pw, const char *term, |
899 | const char *display, const char *auth_proto, | |
900 | const char *auth_data, const char *ttyname) | |
901 | { | |
902 | const char *shell, *cp = NULL; | |
903 | char buf[256]; | |
6fc1e9f3 | 904 | char cmd[1024]; |
7368a6c8 | 905 | FILE *f; |
906 | unsigned int envsize, i; | |
907 | char **env; | |
908 | extern char **environ; | |
909 | struct stat st; | |
910 | char *argv[10]; | |
3206bb3b | 911 | #ifdef WITH_IRIX_PROJECT |
912 | prid_t projid; | |
913 | #endif /* WITH_IRIX_PROJECT */ | |
7368a6c8 | 914 | |
fa649821 | 915 | /* login(1) is only called if we execute the login shell */ |
916 | if (options.use_login && command != NULL) | |
917 | options.use_login = 0; | |
918 | ||
7368a6c8 | 919 | #ifndef USE_PAM /* pam_nologin handles this */ |
920 | f = fopen("/etc/nologin", "r"); | |
921 | if (f) { | |
922 | /* /etc/nologin exists. Print its contents and exit. */ | |
923 | while (fgets(buf, sizeof(buf), f)) | |
924 | fputs(buf, stderr); | |
925 | fclose(f); | |
926 | if (pw->pw_uid != 0) | |
927 | exit(254); | |
928 | } | |
929 | #endif /* USE_PAM */ | |
930 | ||
4d33e531 | 931 | #ifndef HAVE_OSF_SIA |
7368a6c8 | 932 | /* Set login name in the kernel. */ |
933 | if (setlogin(pw->pw_name) < 0) | |
934 | error("setlogin failed: %s", strerror(errno)); | |
4d33e531 | 935 | #endif |
7368a6c8 | 936 | |
937 | /* Set uid, gid, and groups. */ | |
938 | /* Login(1) does this as well, and it needs uid 0 for the "-h" | |
939 | switch, so we let login(1) to this for us. */ | |
940 | if (!options.use_login) { | |
4d33e531 | 941 | #ifdef HAVE_OSF_SIA |
942 | extern char **saved_argv; | |
943 | extern int saved_argc; | |
944 | char *host = get_canonical_hostname (); | |
945 | ||
946 | if (sia_become_user(NULL, saved_argc, saved_argv, host, | |
947 | pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) != | |
948 | SIASUCCESS) { | |
949 | perror("sia_become_user"); | |
950 | exit(1); | |
951 | } | |
952 | if (setreuid(geteuid(), geteuid()) < 0) { | |
953 | perror("setreuid"); | |
954 | exit(1); | |
955 | } | |
956 | #else /* HAVE_OSF_SIA */ | |
7368a6c8 | 957 | if (getuid() == 0 || geteuid() == 0) { |
5fa45897 | 958 | #if defined(HAVE_GETUSERATTR) |
959 | set_limits_from_userattr(pw->pw_name); | |
960 | #endif /* defined(HAVE_GETUSERATTR) */ | |
961 | ||
7368a6c8 | 962 | if (setgid(pw->pw_gid) < 0) { |
963 | perror("setgid"); | |
964 | exit(1); | |
965 | } | |
966 | /* Initialize the group list. */ | |
967 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
968 | perror("initgroups"); | |
969 | exit(1); | |
970 | } | |
971 | endgrent(); | |
972 | ||
3206bb3b | 973 | #ifdef WITH_IRIX_ARRAY |
974 | /* initialize array session */ | |
975 | if (newarraysess() != 0) | |
976 | fatal("Failed to set up new array session: %.100s", | |
977 | strerror(errno)); | |
978 | #endif /* WITH_IRIX_ARRAY */ | |
979 | ||
980 | #ifdef WITH_IRIX_PROJECT | |
981 | /* initialize irix project info */ | |
982 | if ((projid = getdfltprojuser(pw->pw_name)) == -1) { | |
983 | debug("Failed to get project id, using projid 0"); | |
984 | projid = 0; | |
985 | } | |
986 | ||
987 | if (setprid(projid)) | |
988 | fatal("Failed to initialize project %d for %s: %.100s", | |
989 | (int)projid, pw->pw_name, strerror(errno)); | |
990 | #endif /* WITH_IRIX_PROJECT */ | |
991 | ||
7368a6c8 | 992 | /* Permanently switch to the desired uid. */ |
993 | permanently_set_uid(pw->pw_uid); | |
994 | } | |
995 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) | |
996 | fatal("Failed to set uids to %d.", (int) pw->pw_uid); | |
4d33e531 | 997 | #endif /* HAVE_OSF_SIA */ |
7368a6c8 | 998 | } |
999 | /* | |
1000 | * Get the shell from the password data. An empty shell field is | |
1001 | * legal, and means /bin/sh. | |
1002 | */ | |
1003 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
1004 | ||
1005 | #ifdef AFS | |
1006 | /* Try to get AFS tokens for the local cell. */ | |
1007 | if (k_hasafs()) { | |
1008 | char cell[64]; | |
1009 | ||
1010 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1011 | krb_afslog(cell, 0); | |
1012 | ||
1013 | krb_afslog(0, 0); | |
1014 | } | |
1015 | #endif /* AFS */ | |
1016 | ||
1017 | /* Initialize the environment. */ | |
1018 | envsize = 100; | |
1019 | env = xmalloc(envsize * sizeof(char *)); | |
1020 | env[0] = NULL; | |
1021 | ||
1022 | if (!options.use_login) { | |
1023 | /* Set basic environment. */ | |
1024 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1025 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1026 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
1027 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
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 | while (custom_environment) { | |
1041 | struct envstring *ce = custom_environment; | |
1042 | char *s = ce->s; | |
1043 | int i; | |
1044 | for (i = 0; s[i] != '=' && s[i]; i++); | |
1045 | if (s[i] == '=') { | |
1046 | s[i] = 0; | |
1047 | child_set_env(&env, &envsize, s, s + i + 1); | |
1048 | } | |
1049 | custom_environment = ce->next; | |
1050 | xfree(ce->s); | |
1051 | xfree(ce); | |
1052 | } | |
1053 | ||
1054 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
1055 | get_remote_ipaddr(), get_remote_port(), get_local_port()); | |
1056 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); | |
1057 | ||
1058 | if (ttyname) | |
1059 | child_set_env(&env, &envsize, "SSH_TTY", ttyname); | |
1060 | if (term) | |
1061 | child_set_env(&env, &envsize, "TERM", term); | |
1062 | if (display) | |
1063 | child_set_env(&env, &envsize, "DISPLAY", display); | |
1064 | ||
1065 | #ifdef _AIX | |
1066 | { | |
1067 | char *authstate,*krb5cc; | |
1068 | ||
1069 | if ((authstate = getenv("AUTHSTATE")) != NULL) | |
1070 | child_set_env(&env,&envsize,"AUTHSTATE",authstate); | |
1071 | ||
1072 | if ((krb5cc = getenv("KRB5CCNAME")) != NULL) | |
1073 | child_set_env(&env,&envsize,"KRB5CCNAME",krb5cc); | |
1074 | } | |
1075 | #endif | |
1076 | ||
1077 | #ifdef KRB4 | |
1078 | { | |
1079 | extern char *ticket; | |
1080 | ||
1081 | if (ticket) | |
1082 | child_set_env(&env, &envsize, "KRBTKFILE", ticket); | |
1083 | } | |
1084 | #endif /* KRB4 */ | |
1085 | ||
1086 | #ifdef USE_PAM | |
1087 | /* Pull in any environment variables that may have been set by PAM. */ | |
1088 | do_pam_environment(&env, &envsize); | |
1089 | #endif /* USE_PAM */ | |
1090 | ||
1091 | read_environment_file(&env,&envsize,"/etc/environment"); | |
1092 | ||
1093 | if (xauthfile) | |
1094 | child_set_env(&env, &envsize, "XAUTHORITY", xauthfile); | |
1095 | if (auth_get_socket_name() != NULL) | |
1096 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, | |
1097 | auth_get_socket_name()); | |
1098 | ||
1099 | /* read $HOME/.ssh/environment. */ | |
1100 | if (!options.use_login) { | |
71276795 | 1101 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1102 | pw->pw_dir); | |
7368a6c8 | 1103 | read_environment_file(&env, &envsize, buf); |
1104 | } | |
1105 | if (debug_flag) { | |
1106 | /* dump the environment */ | |
1107 | fprintf(stderr, "Environment:\n"); | |
1108 | for (i = 0; env[i]; i++) | |
1109 | fprintf(stderr, " %.200s\n", env[i]); | |
1110 | } | |
1111 | /* | |
1112 | * Close the connection descriptors; note that this is the child, and | |
1113 | * the server will still have the socket open, and it is important | |
1114 | * that we do not shutdown it. Note that the descriptors cannot be | |
1115 | * closed before building the environment, as we call | |
1116 | * get_remote_ipaddr there. | |
1117 | */ | |
1118 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1119 | close(packet_get_connection_in()); | |
1120 | else { | |
1121 | close(packet_get_connection_in()); | |
1122 | close(packet_get_connection_out()); | |
1123 | } | |
1124 | /* | |
1125 | * Close all descriptors related to channels. They will still remain | |
1126 | * open in the parent. | |
1127 | */ | |
1128 | /* XXX better use close-on-exec? -markus */ | |
1129 | channel_close_all(); | |
1130 | ||
1131 | /* | |
1132 | * Close any extra file descriptors. Note that there may still be | |
1133 | * descriptors left by system functions. They will be closed later. | |
1134 | */ | |
1135 | endpwent(); | |
1136 | ||
1137 | /* | |
1138 | * Close any extra open file descriptors so that we don\'t have them | |
1139 | * hanging around in clients. Note that we want to do this after | |
1140 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1141 | * descriptors open. | |
1142 | */ | |
1143 | for (i = 3; i < 64; i++) | |
1144 | close(i); | |
1145 | ||
1146 | /* Change current directory to the user\'s home directory. */ | |
1147 | if (chdir(pw->pw_dir) < 0) | |
1148 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1149 | pw->pw_dir, strerror(errno)); | |
1150 | ||
1151 | /* | |
1152 | * Must take new environment into use so that .ssh/rc, /etc/sshrc and | |
1153 | * xauth are run in the proper environment. | |
1154 | */ | |
1155 | environ = env; | |
1156 | ||
1157 | /* | |
1158 | * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first | |
1159 | * in this order). | |
1160 | */ | |
1161 | if (!options.use_login) { | |
1162 | if (stat(SSH_USER_RC, &st) >= 0) { | |
1163 | if (debug_flag) | |
30228d7c | 1164 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_USER_RC); |
7368a6c8 | 1165 | |
30228d7c | 1166 | f = popen(_PATH_BSHELL " " SSH_USER_RC, "w"); |
7368a6c8 | 1167 | if (f) { |
1168 | if (auth_proto != NULL && auth_data != NULL) | |
1169 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1170 | pclose(f); | |
1171 | } else | |
1172 | fprintf(stderr, "Could not run %s\n", SSH_USER_RC); | |
1173 | } else if (stat(SSH_SYSTEM_RC, &st) >= 0) { | |
1174 | if (debug_flag) | |
30228d7c | 1175 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_SYSTEM_RC); |
7368a6c8 | 1176 | |
30228d7c | 1177 | f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w"); |
7368a6c8 | 1178 | if (f) { |
1179 | if (auth_proto != NULL && auth_data != NULL) | |
1180 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1181 | pclose(f); | |
1182 | } else | |
1183 | fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC); | |
6fc1e9f3 | 1184 | } else if (options.xauth_location != NULL) { |
7368a6c8 | 1185 | /* Add authority data to .Xauthority if appropriate. */ |
1186 | if (auth_proto != NULL && auth_data != NULL) { | |
29611d9c | 1187 | char *screen = strchr(display, ':'); |
1188 | if (debug_flag) { | |
71276795 | 1189 | fprintf(stderr, |
1190 | "Running %.100s add %.100s %.100s %.100s\n", | |
6fc1e9f3 | 1191 | options.xauth_location, display, |
1192 | auth_proto, auth_data); | |
29611d9c | 1193 | if (screen != NULL) |
71276795 | 1194 | fprintf(stderr, |
1195 | "Adding %.*s/unix%s %s %s\n", | |
1196 | screen-display, display, | |
1197 | screen, auth_proto, auth_data); | |
29611d9c | 1198 | } |
6fc1e9f3 | 1199 | snprintf(cmd, sizeof cmd, "%s -q -", |
1200 | options.xauth_location); | |
1201 | f = popen(cmd, "w"); | |
7368a6c8 | 1202 | if (f) { |
71276795 | 1203 | fprintf(f, "add %s %s %s\n", display, |
1204 | auth_proto, auth_data); | |
29611d9c | 1205 | if (screen != NULL) |
1206 | fprintf(f, "add %.*s/unix%s %s %s\n", | |
71276795 | 1207 | screen-display, display, |
1208 | screen, auth_proto, auth_data); | |
7368a6c8 | 1209 | pclose(f); |
6fc1e9f3 | 1210 | } else { |
1211 | fprintf(stderr, "Could not run %s\n", | |
1212 | cmd); | |
1213 | } | |
7368a6c8 | 1214 | } |
1215 | } | |
7368a6c8 | 1216 | /* Get the last component of the shell name. */ |
1217 | cp = strrchr(shell, '/'); | |
1218 | if (cp) | |
1219 | cp++; | |
1220 | else | |
1221 | cp = shell; | |
1222 | } | |
1223 | /* | |
1224 | * If we have no command, execute the shell. In this case, the shell | |
1225 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1226 | * this is a login shell. | |
1227 | */ | |
1228 | if (!command) { | |
1229 | if (!options.use_login) { | |
1230 | char buf[256]; | |
1231 | ||
1232 | /* | |
1233 | * Check for mail if we have a tty and it was enabled | |
1234 | * in server options. | |
1235 | */ | |
1236 | if (ttyname && options.check_mail) { | |
1237 | char *mailbox; | |
1238 | struct stat mailstat; | |
1239 | mailbox = getenv("MAIL"); | |
1240 | if (mailbox != NULL) { | |
71276795 | 1241 | if (stat(mailbox, &mailstat) != 0 || |
1242 | mailstat.st_size == 0) | |
7368a6c8 | 1243 | printf("No mail.\n"); |
1244 | else if (mailstat.st_mtime < mailstat.st_atime) | |
1245 | printf("You have mail.\n"); | |
1246 | else | |
1247 | printf("You have new mail.\n"); | |
1248 | } | |
1249 | } | |
1250 | /* Start the shell. Set initial character to '-'. */ | |
1251 | buf[0] = '-'; | |
1252 | strncpy(buf + 1, cp, sizeof(buf) - 1); | |
1253 | buf[sizeof(buf) - 1] = 0; | |
1254 | ||
1255 | /* Execute the shell. */ | |
1256 | argv[0] = buf; | |
1257 | argv[1] = NULL; | |
1258 | execve(shell, argv, env); | |
1259 | ||
1260 | /* Executing the shell failed. */ | |
1261 | perror(shell); | |
1262 | exit(1); | |
1263 | ||
1264 | } else { | |
1265 | /* Launch login(1). */ | |
1266 | ||
30228d7c | 1267 | execl(LOGIN_PROGRAM, "login", "-h", get_remote_ipaddr(), |
7368a6c8 | 1268 | "-p", "-f", "--", pw->pw_name, NULL); |
1269 | ||
1270 | /* Login couldn't be executed, die. */ | |
1271 | ||
1272 | perror("login"); | |
1273 | exit(1); | |
1274 | } | |
1275 | } | |
1276 | /* | |
1277 | * Execute the command using the user's shell. This uses the -c | |
1278 | * option to execute the command. | |
1279 | */ | |
1280 | argv[0] = (char *) cp; | |
1281 | argv[1] = "-c"; | |
1282 | argv[2] = (char *) command; | |
1283 | argv[3] = NULL; | |
1284 | execve(shell, argv, env); | |
1285 | perror(shell); | |
1286 | exit(1); | |
1287 | } | |
1288 | ||
1289 | Session * | |
1290 | session_new(void) | |
1291 | { | |
1292 | int i; | |
1293 | static int did_init = 0; | |
1294 | if (!did_init) { | |
1295 | debug("session_new: init"); | |
1296 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1297 | sessions[i].used = 0; | |
1298 | sessions[i].self = i; | |
1299 | } | |
1300 | did_init = 1; | |
1301 | } | |
1302 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1303 | Session *s = &sessions[i]; | |
1304 | if (! s->used) { | |
1305 | s->pid = 0; | |
0b242b12 | 1306 | s->extended = 0; |
7368a6c8 | 1307 | s->chanid = -1; |
1308 | s->ptyfd = -1; | |
1309 | s->ttyfd = -1; | |
1310 | s->term = NULL; | |
1311 | s->pw = NULL; | |
1312 | s->display = NULL; | |
1313 | s->screen = 0; | |
1314 | s->auth_data = NULL; | |
1315 | s->auth_proto = NULL; | |
1316 | s->used = 1; | |
0b242b12 | 1317 | s->pw = NULL; |
7368a6c8 | 1318 | debug("session_new: session %d", i); |
1319 | return s; | |
1320 | } | |
1321 | } | |
1322 | return NULL; | |
1323 | } | |
1324 | ||
1325 | void | |
1326 | session_dump(void) | |
1327 | { | |
1328 | int i; | |
1329 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1330 | Session *s = &sessions[i]; | |
1331 | debug("dump: used %d session %d %p channel %d pid %d", | |
1332 | s->used, | |
1333 | s->self, | |
1334 | s, | |
1335 | s->chanid, | |
1336 | s->pid); | |
1337 | } | |
1338 | } | |
1339 | ||
e78a59f5 | 1340 | int |
1341 | session_open(int chanid) | |
1342 | { | |
1343 | Session *s = session_new(); | |
1344 | debug("session_open: channel %d", chanid); | |
1345 | if (s == NULL) { | |
1346 | error("no more sessions"); | |
1347 | return 0; | |
1348 | } | |
e78a59f5 | 1349 | s->pw = auth_get_user(); |
1350 | if (s->pw == NULL) | |
0b242b12 | 1351 | fatal("no user for session %i", s->self); |
1352 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1353 | s->chanid = chanid; | |
e78a59f5 | 1354 | return 1; |
1355 | } | |
1356 | ||
1357 | Session * | |
1358 | session_by_channel(int id) | |
1359 | { | |
1360 | int i; | |
1361 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1362 | Session *s = &sessions[i]; | |
1363 | if (s->used && s->chanid == id) { | |
1364 | debug("session_by_channel: session %d channel %d", i, id); | |
1365 | return s; | |
1366 | } | |
1367 | } | |
1368 | debug("session_by_channel: unknown channel %d", id); | |
1369 | session_dump(); | |
1370 | return NULL; | |
1371 | } | |
1372 | ||
1373 | Session * | |
1374 | session_by_pid(pid_t pid) | |
1375 | { | |
1376 | int i; | |
1377 | debug("session_by_pid: pid %d", pid); | |
1378 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1379 | Session *s = &sessions[i]; | |
1380 | if (s->used && s->pid == pid) | |
1381 | return s; | |
1382 | } | |
1383 | error("session_by_pid: unknown pid %d", pid); | |
1384 | session_dump(); | |
1385 | return NULL; | |
1386 | } | |
1387 | ||
1388 | int | |
1389 | session_window_change_req(Session *s) | |
1390 | { | |
1391 | s->col = packet_get_int(); | |
1392 | s->row = packet_get_int(); | |
1393 | s->xpixel = packet_get_int(); | |
1394 | s->ypixel = packet_get_int(); | |
6ae2364d | 1395 | packet_done(); |
e78a59f5 | 1396 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1397 | return 1; | |
1398 | } | |
1399 | ||
1400 | int | |
1401 | session_pty_req(Session *s) | |
1402 | { | |
1403 | unsigned int len; | |
6ae2364d | 1404 | char *term_modes; /* encoded terminal modes */ |
e78a59f5 | 1405 | |
38c295d6 | 1406 | if (no_pty_flag) |
1407 | return 0; | |
e78a59f5 | 1408 | if (s->ttyfd != -1) |
6ae2364d | 1409 | return 0; |
e78a59f5 | 1410 | s->term = packet_get_string(&len); |
1411 | s->col = packet_get_int(); | |
1412 | s->row = packet_get_int(); | |
1413 | s->xpixel = packet_get_int(); | |
1414 | s->ypixel = packet_get_int(); | |
6ae2364d | 1415 | term_modes = packet_get_string(&len); |
1416 | packet_done(); | |
e78a59f5 | 1417 | |
1418 | if (strcmp(s->term, "") == 0) { | |
1419 | xfree(s->term); | |
1420 | s->term = NULL; | |
1421 | } | |
1422 | /* Allocate a pty and open it. */ | |
1423 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) { | |
1424 | xfree(s->term); | |
1425 | s->term = NULL; | |
1426 | s->ptyfd = -1; | |
1427 | s->ttyfd = -1; | |
1428 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1429 | xfree(term_modes); |
1430 | return 0; | |
e78a59f5 | 1431 | } |
1432 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1433 | /* | |
1434 | * Add a cleanup function to clear the utmp entry and record logout | |
1435 | * time in case we call fatal() (e.g., the connection gets closed). | |
1436 | */ | |
1437 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
1438 | pty_setowner(s->pw, s->tty); | |
1439 | /* Get window size from the packet. */ | |
1440 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1441 | ||
1d1ffb87 | 1442 | session_proctitle(s); |
1443 | ||
35484284 | 1444 | /* XXX parse and set terminal modes */ |
1445 | xfree(term_modes); | |
e78a59f5 | 1446 | return 1; |
1447 | } | |
1448 | ||
0b242b12 | 1449 | int |
1450 | session_subsystem_req(Session *s) | |
1451 | { | |
1452 | unsigned int len; | |
1453 | int success = 0; | |
1454 | char *subsys = packet_get_string(&len); | |
38c295d6 | 1455 | int i; |
0b242b12 | 1456 | |
1457 | packet_done(); | |
1458 | log("subsystem request for %s", subsys); | |
1459 | ||
38c295d6 | 1460 | for (i = 0; i < options.num_subsystems; i++) { |
1461 | if(strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1462 | debug("subsystem: exec() %s", options.subsystem_command[i]); | |
1463 | do_exec_no_pty(s, options.subsystem_command[i], s->pw); | |
1464 | success = 1; | |
1465 | } | |
1466 | } | |
1467 | ||
1468 | if (!success) | |
1469 | log("subsystem request for %s failed, subsystem not found", subsys); | |
1470 | ||
0b242b12 | 1471 | xfree(subsys); |
1472 | return success; | |
1473 | } | |
1474 | ||
1475 | int | |
1476 | session_x11_req(Session *s) | |
1477 | { | |
089fbbd2 | 1478 | if (no_x11_forwarding_flag) { |
38c295d6 | 1479 | debug("X11 forwarding disabled in user configuration file."); |
1480 | return 0; | |
1481 | } | |
0b242b12 | 1482 | if (!options.x11_forwarding) { |
1483 | debug("X11 forwarding disabled in server configuration file."); | |
1484 | return 0; | |
1485 | } | |
1486 | if (xauthfile != NULL) { | |
1487 | debug("X11 fwd already started."); | |
1488 | return 0; | |
1489 | } | |
1490 | ||
1491 | debug("Received request for X11 forwarding with auth spoofing."); | |
1492 | if (s->display != NULL) | |
1493 | packet_disconnect("Protocol error: X11 display already set."); | |
1494 | ||
1495 | s->single_connection = packet_get_char(); | |
1496 | s->auth_proto = packet_get_string(NULL); | |
1497 | s->auth_data = packet_get_string(NULL); | |
1498 | s->screen = packet_get_int(); | |
1499 | packet_done(); | |
1500 | ||
1501 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
1502 | if (s->display == NULL) { | |
1503 | xfree(s->auth_proto); | |
1504 | xfree(s->auth_data); | |
1505 | return 0; | |
1506 | } | |
1507 | xauthfile = xmalloc(MAXPATHLEN); | |
1508 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
1509 | temporarily_use_uid(s->pw->pw_uid); | |
1510 | if (mkdtemp(xauthfile) == NULL) { | |
1511 | restore_uid(); | |
1512 | error("private X11 dir: mkdtemp %s failed: %s", | |
1513 | xauthfile, strerror(errno)); | |
1514 | xfree(xauthfile); | |
1515 | xauthfile = NULL; | |
1516 | xfree(s->auth_proto); | |
1517 | xfree(s->auth_data); | |
1518 | /* XXXX remove listening channels */ | |
1519 | return 0; | |
1520 | } | |
1521 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
1522 | open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); | |
1523 | restore_uid(); | |
1524 | fatal_add_cleanup(xauthfile_cleanup_proc, s); | |
1525 | return 1; | |
1526 | } | |
1527 | ||
38c295d6 | 1528 | int |
1529 | session_shell_req(Session *s) | |
1530 | { | |
1531 | /* if forced_command == NULL, the shell is execed */ | |
1532 | char *shell = forced_command; | |
1533 | packet_done(); | |
1534 | s->extended = 1; | |
1535 | if (s->ttyfd == -1) | |
1536 | do_exec_no_pty(s, shell, s->pw); | |
1537 | else | |
1538 | do_exec_pty(s, shell, s->pw); | |
1539 | return 1; | |
1540 | } | |
1541 | ||
1542 | int | |
1543 | session_exec_req(Session *s) | |
1544 | { | |
1545 | unsigned int len; | |
1546 | char *command = packet_get_string(&len); | |
1547 | packet_done(); | |
1548 | if (forced_command) { | |
1549 | xfree(command); | |
1550 | command = forced_command; | |
1551 | debug("Forced command '%.500s'", forced_command); | |
1552 | } | |
1553 | s->extended = 1; | |
1554 | if (s->ttyfd == -1) | |
1555 | do_exec_no_pty(s, command, s->pw); | |
1556 | else | |
1557 | do_exec_pty(s, command, s->pw); | |
1558 | if (forced_command == NULL) | |
1559 | xfree(command); | |
1560 | return 1; | |
1561 | } | |
1562 | ||
e78a59f5 | 1563 | void |
1564 | session_input_channel_req(int id, void *arg) | |
1565 | { | |
1566 | unsigned int len; | |
1567 | int reply; | |
1568 | int success = 0; | |
1569 | char *rtype; | |
1570 | Session *s; | |
1571 | Channel *c; | |
1572 | ||
1573 | rtype = packet_get_string(&len); | |
1574 | reply = packet_get_char(); | |
1575 | ||
1576 | s = session_by_channel(id); | |
1577 | if (s == NULL) | |
1578 | fatal("session_input_channel_req: channel %d: no session", id); | |
1579 | c = channel_lookup(id); | |
1580 | if (c == NULL) | |
1581 | fatal("session_input_channel_req: channel %d: bad channel", id); | |
1582 | ||
1583 | debug("session_input_channel_req: session %d channel %d request %s reply %d", | |
1584 | s->self, id, rtype, reply); | |
1585 | ||
1586 | /* | |
1587 | * a session is in LARVAL state until a shell | |
1588 | * or programm is executed | |
1589 | */ | |
1590 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1591 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1592 | success = session_shell_req(s); |
e78a59f5 | 1593 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1594 | success = session_exec_req(s); |
e78a59f5 | 1595 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1596 | success = session_pty_req(s); |
0b242b12 | 1597 | } else if (strcmp(rtype, "x11-req") == 0) { |
1598 | success = session_x11_req(s); | |
1599 | } else if (strcmp(rtype, "subsystem") == 0) { | |
1600 | success = session_subsystem_req(s); | |
e78a59f5 | 1601 | } |
1602 | } | |
1603 | if (strcmp(rtype, "window-change") == 0) { | |
1604 | success = session_window_change_req(s); | |
1605 | } | |
1606 | ||
1607 | if (reply) { | |
1608 | packet_start(success ? | |
1609 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1610 | packet_put_int(c->remote_id); | |
1611 | packet_send(); | |
1612 | } | |
1613 | xfree(rtype); | |
1614 | } | |
1615 | ||
1616 | void | |
1617 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1618 | { | |
1619 | if (!compat20) | |
1620 | fatal("session_set_fds: called for proto != 2.0"); | |
1621 | /* | |
1622 | * now that have a child and a pipe to the child, | |
1623 | * we can activate our channel and register the fd's | |
1624 | */ | |
1625 | if (s->chanid == -1) | |
1626 | fatal("no channel for session %d", s->self); | |
1627 | channel_set_fds(s->chanid, | |
1628 | fdout, fdin, fderr, | |
1629 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ); | |
1630 | } | |
1631 | ||
7368a6c8 | 1632 | void |
1633 | session_pty_cleanup(Session *s) | |
1634 | { | |
1635 | if (s == NULL || s->ttyfd == -1) | |
1636 | return; | |
1637 | ||
1638 | debug("session_pty_cleanup: session %i release %s", s->self, s->tty); | |
1639 | ||
1640 | /* Cancel the cleanup function. */ | |
1641 | fatal_remove_cleanup(pty_cleanup_proc, (void *)s); | |
1642 | ||
1643 | /* Record that the user has logged out. */ | |
1644 | record_logout(s->pid, s->tty); | |
1645 | ||
1646 | /* Release the pseudo-tty. */ | |
1647 | pty_release(s->tty); | |
1648 | ||
1649 | /* | |
1650 | * Close the server side of the socket pairs. We must do this after | |
1651 | * the pty cleanup, so that another process doesn't get this pty | |
1652 | * while we're still cleaning up. | |
1653 | */ | |
1654 | if (close(s->ptymaster) < 0) | |
1655 | error("close(s->ptymaster): %s", strerror(errno)); | |
1656 | } | |
e78a59f5 | 1657 | |
1658 | void | |
1659 | session_exit_message(Session *s, int status) | |
1660 | { | |
1661 | Channel *c; | |
1662 | if (s == NULL) | |
1663 | fatal("session_close: no session"); | |
1664 | c = channel_lookup(s->chanid); | |
1665 | if (c == NULL) | |
1666 | fatal("session_close: session %d: no channel %d", | |
1667 | s->self, s->chanid); | |
1668 | debug("session_exit_message: session %d channel %d pid %d", | |
1669 | s->self, s->chanid, s->pid); | |
1670 | ||
1671 | if (WIFEXITED(status)) { | |
1672 | channel_request_start(s->chanid, | |
1673 | "exit-status", 0); | |
1674 | packet_put_int(WEXITSTATUS(status)); | |
1675 | packet_send(); | |
1676 | } else if (WIFSIGNALED(status)) { | |
1677 | channel_request_start(s->chanid, | |
1678 | "exit-signal", 0); | |
1679 | packet_put_int(WTERMSIG(status)); | |
a64009ad | 1680 | #ifdef WCOREDUMP |
e78a59f5 | 1681 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1682 | #else /* WCOREDUMP */ |
1683 | packet_put_char(0); | |
1684 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1685 | packet_put_cstring(""); |
1686 | packet_put_cstring(""); | |
1687 | packet_send(); | |
1688 | } else { | |
1689 | /* Some weird exit cause. Just exit. */ | |
1690 | packet_disconnect("wait returned status %04x.", status); | |
1691 | } | |
1692 | ||
1693 | /* disconnect channel */ | |
1694 | debug("session_exit_message: release channel %d", s->chanid); | |
1695 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1696 | /* |
1697 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1698 | * interested in data we write. | |
1699 | * Note that we must not call 'chan_read_failed', since there could | |
1700 | * be some more data waiting in the pipe. | |
1701 | */ | |
0b242b12 | 1702 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1703 | chan_write_failed(c); | |
e78a59f5 | 1704 | s->chanid = -1; |
1705 | } | |
1706 | ||
1707 | void | |
1708 | session_free(Session *s) | |
1709 | { | |
1710 | debug("session_free: session %d pid %d", s->self, s->pid); | |
1711 | if (s->term) | |
1712 | xfree(s->term); | |
1713 | if (s->display) | |
1714 | xfree(s->display); | |
1715 | if (s->auth_data) | |
1716 | xfree(s->auth_data); | |
1717 | if (s->auth_proto) | |
1718 | xfree(s->auth_proto); | |
1719 | s->used = 0; | |
1720 | } | |
1721 | ||
1722 | void | |
1723 | session_close(Session *s) | |
1724 | { | |
1725 | session_pty_cleanup(s); | |
1726 | session_free(s); | |
1d1ffb87 | 1727 | session_proctitle(s); |
e78a59f5 | 1728 | } |
1729 | ||
1730 | void | |
1731 | session_close_by_pid(pid_t pid, int status) | |
1732 | { | |
1733 | Session *s = session_by_pid(pid); | |
1734 | if (s == NULL) { | |
1735 | debug("session_close_by_pid: no session for pid %d", s->pid); | |
1736 | return; | |
1737 | } | |
1738 | if (s->chanid != -1) | |
1739 | session_exit_message(s, status); | |
1740 | session_close(s); | |
1741 | } | |
1742 | ||
1743 | /* | |
1744 | * this is called when a channel dies before | |
1745 | * the session 'child' itself dies | |
1746 | */ | |
1747 | void | |
1748 | session_close_by_channel(int id, void *arg) | |
1749 | { | |
1750 | Session *s = session_by_channel(id); | |
1751 | if (s == NULL) { | |
1752 | debug("session_close_by_channel: no session for channel %d", id); | |
1753 | return; | |
1754 | } | |
1755 | /* disconnect channel */ | |
1756 | channel_cancel_cleanup(s->chanid); | |
1757 | s->chanid = -1; | |
1758 | ||
1759 | debug("session_close_by_channel: channel %d kill %d", id, s->pid); | |
1760 | if (s->pid == 0) { | |
1761 | /* close session immediately */ | |
1762 | session_close(s); | |
1763 | } else { | |
1764 | /* notify child, delay session cleanup */ | |
f528fdf2 | 1765 | if (s->pid <= 1) |
512ad3c0 | 1766 | fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid); |
1767 | if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0) | |
e78a59f5 | 1768 | error("session_close_by_channel: kill %d: %s", |
1769 | s->pid, strerror(errno)); | |
1770 | } | |
1771 | } | |
1772 | ||
1d1ffb87 | 1773 | char * |
1774 | session_tty_list(void) | |
1775 | { | |
1776 | static char buf[1024]; | |
1777 | int i; | |
1778 | buf[0] = '\0'; | |
1779 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1780 | Session *s = &sessions[i]; | |
1781 | if (s->used && s->ttyfd != -1) { | |
1782 | if (buf[0] != '\0') | |
1783 | strlcat(buf, ",", sizeof buf); | |
1784 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1785 | } | |
1786 | } | |
1787 | if (buf[0] == '\0') | |
1788 | strlcpy(buf, "notty", sizeof buf); | |
1789 | return buf; | |
1790 | } | |
1791 | ||
1792 | void | |
1793 | session_proctitle(Session *s) | |
1794 | { | |
1795 | if (s->pw == NULL) | |
1796 | error("no user for session %d", s->self); | |
1797 | else | |
1798 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
1799 | } | |
1800 | ||
e78a59f5 | 1801 | void |
1802 | do_authenticated2(void) | |
1803 | { | |
1804 | /* | |
1805 | * Cancel the alarm we set to limit the time taken for | |
1806 | * authentication. | |
1807 | */ | |
1808 | alarm(0); | |
3f7a7e4a | 1809 | if (startup_pipe != -1) { |
5540ea9b | 1810 | close(startup_pipe); |
3f7a7e4a | 1811 | startup_pipe = -1; |
1812 | } | |
e78a59f5 | 1813 | server_loop2(); |
34bce9a5 | 1814 | if (xauthfile) |
1815 | xauthfile_cleanup_proc(NULL); | |
e78a59f5 | 1816 | } |