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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" | |
14a9a859 | 11 | RCSID("$OpenBSD: session.c,v 1.31 2000/08/28 03:50:54 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) | |
2a2cb9e7 | 46 | # define S_UFSIZE_HARD S_UFSIZE "_hard" |
47 | # define S_UCPU_HARD S_UCPU "_hard" | |
48 | # define S_UDATA_HARD S_UDATA "_hard" | |
49 | # define S_USTACK_HARD S_USTACK "_hard" | |
50 | # define S_URSS_HARD S_URSS "_hard" | |
51 | # define S_UCORE_HARD S_UCORE "_hard" | |
52 | # define S_UNOFILE_HARD S_UNOFILE "_hard" | |
3fcce26c | 53 | #endif |
54 | ||
2e73a022 | 55 | #ifdef HAVE_LOGIN_CAP |
56 | #include <login_cap.h> | |
57 | #endif | |
58 | ||
7368a6c8 | 59 | /* types */ |
60 | ||
61 | #define TTYSZ 64 | |
62 | typedef struct Session Session; | |
63 | struct Session { | |
64 | int used; | |
65 | int self; | |
0b242b12 | 66 | int extended; |
7368a6c8 | 67 | struct passwd *pw; |
68 | pid_t pid; | |
69 | /* tty */ | |
70 | char *term; | |
71 | int ptyfd, ttyfd, ptymaster; | |
72 | int row, col, xpixel, ypixel; | |
73 | char tty[TTYSZ]; | |
74 | /* X11 */ | |
75 | char *display; | |
76 | int screen; | |
77 | char *auth_proto; | |
78 | char *auth_data; | |
0b242b12 | 79 | int single_connection; |
7368a6c8 | 80 | /* proto 2 */ |
81 | int chanid; | |
82 | }; | |
83 | ||
84 | /* func */ | |
85 | ||
86 | Session *session_new(void); | |
87 | void session_set_fds(Session *s, int fdin, int fdout, int fderr); | |
88 | void session_pty_cleanup(Session *s); | |
1d1ffb87 | 89 | void session_proctitle(Session *s); |
7368a6c8 | 90 | void do_exec_pty(Session *s, const char *command, struct passwd * pw); |
91 | void do_exec_no_pty(Session *s, const char *command, struct passwd * pw); | |
c345cf9d | 92 | void do_login(Session *s); |
7368a6c8 | 93 | |
94 | void | |
95 | do_child(const char *command, struct passwd * pw, const char *term, | |
96 | const char *display, const char *auth_proto, | |
97 | const char *auth_data, const char *ttyname); | |
98 | ||
99 | /* import */ | |
100 | extern ServerOptions options; | |
3a6cb538 | 101 | #ifdef HAVE___PROGNAME |
7368a6c8 | 102 | extern char *__progname; |
3a6cb538 | 103 | #else /* HAVE___PROGNAME */ |
3fd95d9a | 104 | static const char *__progname = "sshd"; |
3a6cb538 | 105 | #endif /* HAVE___PROGNAME */ |
106 | ||
7368a6c8 | 107 | extern int log_stderr; |
108 | extern int debug_flag; | |
c345cf9d | 109 | extern unsigned int utmp_len; |
7368a6c8 | 110 | |
089fbbd2 | 111 | extern int startup_pipe; |
112 | ||
7368a6c8 | 113 | /* Local Xauthority file. */ |
114 | static char *xauthfile; | |
115 | ||
116 | /* data */ | |
117 | #define MAX_SESSIONS 10 | |
118 | Session sessions[MAX_SESSIONS]; | |
c1ef8333 | 119 | #ifdef WITH_AIXAUTHENTICATE |
120 | /* AIX's lastlogin message, set in auth1.c */ | |
121 | char *aixloginmsg; | |
122 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 123 | |
2e73a022 | 124 | #ifdef HAVE_LOGIN_CAP |
125 | static login_cap_t *lc; | |
126 | #endif | |
127 | ||
7368a6c8 | 128 | /* |
129 | * Remove local Xauthority file. | |
130 | */ | |
131 | void | |
132 | xauthfile_cleanup_proc(void *ignore) | |
133 | { | |
134 | debug("xauthfile_cleanup_proc called"); | |
135 | ||
136 | if (xauthfile != NULL) { | |
137 | char *p; | |
138 | unlink(xauthfile); | |
139 | p = strrchr(xauthfile, '/'); | |
140 | if (p != NULL) { | |
141 | *p = '\0'; | |
142 | rmdir(xauthfile); | |
143 | } | |
144 | xfree(xauthfile); | |
145 | xauthfile = NULL; | |
146 | } | |
147 | } | |
148 | ||
149 | /* | |
150 | * Function to perform cleanup if we get aborted abnormally (e.g., due to a | |
151 | * dropped connection). | |
152 | */ | |
6ae2364d | 153 | void |
7368a6c8 | 154 | pty_cleanup_proc(void *session) |
155 | { | |
156 | Session *s=session; | |
157 | if (s == NULL) | |
158 | fatal("pty_cleanup_proc: no session"); | |
159 | debug("pty_cleanup_proc: %s", s->tty); | |
160 | ||
161 | if (s->pid != 0) { | |
162 | /* Record that the user has logged out. */ | |
163 | record_logout(s->pid, s->tty); | |
164 | } | |
165 | ||
166 | /* Release the pseudo-tty. */ | |
167 | pty_release(s->tty); | |
168 | } | |
169 | ||
170 | /* | |
171 | * Prepares for an interactive session. This is called after the user has | |
172 | * been successfully authenticated. During this message exchange, pseudo | |
173 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
174 | * are requested, etc. | |
175 | */ | |
6ae2364d | 176 | void |
7368a6c8 | 177 | do_authenticated(struct passwd * pw) |
178 | { | |
179 | Session *s; | |
180 | int type; | |
181 | int compression_level = 0, enable_compression_after_reply = 0; | |
182 | int have_pty = 0; | |
183 | char *command; | |
184 | int n_bytes; | |
185 | int plen; | |
186 | unsigned int proto_len, data_len, dlen; | |
187 | ||
188 | /* | |
189 | * Cancel the alarm we set to limit the time taken for | |
190 | * authentication. | |
191 | */ | |
192 | alarm(0); | |
3f7a7e4a | 193 | if (startup_pipe != -1) { |
5540ea9b | 194 | close(startup_pipe); |
3f7a7e4a | 195 | startup_pipe = -1; |
196 | } | |
7368a6c8 | 197 | |
198 | /* | |
199 | * Inform the channel mechanism that we are the server side and that | |
200 | * the client may request to connect to any port at all. (The user | |
201 | * could do it anyway, and we wouldn\'t know what is permitted except | |
202 | * by the client telling us, so we can equally well trust the client | |
203 | * not to request anything bogus.) | |
204 | */ | |
205 | if (!no_port_forwarding_flag) | |
206 | channel_permit_all_opens(); | |
207 | ||
208 | s = session_new(); | |
0b242b12 | 209 | s->pw = pw; |
7368a6c8 | 210 | |
2e73a022 | 211 | #ifdef HAVE_LOGIN_CAP |
212 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
213 | error("unable to get login class"); | |
214 | return; | |
215 | } | |
216 | #endif | |
217 | ||
7368a6c8 | 218 | /* |
219 | * We stay in this loop until the client requests to execute a shell | |
220 | * or a command. | |
221 | */ | |
222 | for (;;) { | |
223 | int success = 0; | |
224 | ||
225 | /* Get a packet from the client. */ | |
226 | type = packet_read(&plen); | |
227 | ||
228 | /* Process the packet. */ | |
229 | switch (type) { | |
230 | case SSH_CMSG_REQUEST_COMPRESSION: | |
231 | packet_integrity_check(plen, 4, type); | |
232 | compression_level = packet_get_int(); | |
233 | if (compression_level < 1 || compression_level > 9) { | |
234 | packet_send_debug("Received illegal compression level %d.", | |
235 | compression_level); | |
236 | break; | |
237 | } | |
238 | /* Enable compression after we have responded with SUCCESS. */ | |
239 | enable_compression_after_reply = 1; | |
240 | success = 1; | |
241 | break; | |
242 | ||
243 | case SSH_CMSG_REQUEST_PTY: | |
244 | if (no_pty_flag) { | |
245 | debug("Allocating a pty not permitted for this authentication."); | |
246 | break; | |
247 | } | |
248 | if (have_pty) | |
249 | packet_disconnect("Protocol error: you already have a pty."); | |
250 | ||
251 | debug("Allocating pty."); | |
252 | ||
253 | /* Allocate a pty and open it. */ | |
254 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, | |
255 | sizeof(s->tty))) { | |
256 | error("Failed to allocate pty."); | |
257 | break; | |
258 | } | |
259 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
260 | pty_setowner(pw, s->tty); | |
261 | ||
262 | /* Get TERM from the packet. Note that the value may be of arbitrary length. */ | |
263 | s->term = packet_get_string(&dlen); | |
264 | packet_integrity_check(dlen, strlen(s->term), type); | |
265 | /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */ | |
266 | /* Remaining bytes */ | |
267 | n_bytes = plen - (4 + dlen + 4 * 4); | |
268 | ||
269 | if (strcmp(s->term, "") == 0) { | |
270 | xfree(s->term); | |
271 | s->term = NULL; | |
272 | } | |
273 | /* Get window size from the packet. */ | |
274 | s->row = packet_get_int(); | |
275 | s->col = packet_get_int(); | |
276 | s->xpixel = packet_get_int(); | |
277 | s->ypixel = packet_get_int(); | |
278 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
279 | ||
280 | /* Get tty modes from the packet. */ | |
281 | tty_parse_modes(s->ttyfd, &n_bytes); | |
282 | packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type); | |
283 | ||
1d1ffb87 | 284 | session_proctitle(s); |
285 | ||
7368a6c8 | 286 | /* Indicate that we now have a pty. */ |
287 | success = 1; | |
288 | have_pty = 1; | |
289 | break; | |
290 | ||
291 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
292 | if (!options.x11_forwarding) { | |
293 | packet_send_debug("X11 forwarding disabled in server configuration file."); | |
294 | break; | |
295 | } | |
6fc1e9f3 | 296 | if (!options.xauth_location) { |
297 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
298 | break; | |
299 | } | |
7368a6c8 | 300 | if (no_x11_forwarding_flag) { |
301 | packet_send_debug("X11 forwarding not permitted for this authentication."); | |
302 | break; | |
303 | } | |
304 | debug("Received request for X11 forwarding with auth spoofing."); | |
305 | if (s->display != NULL) | |
306 | packet_disconnect("Protocol error: X11 display already set."); | |
307 | ||
308 | s->auth_proto = packet_get_string(&proto_len); | |
309 | s->auth_data = packet_get_string(&data_len); | |
310 | packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type); | |
311 | ||
312 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER) | |
313 | s->screen = packet_get_int(); | |
314 | else | |
315 | s->screen = 0; | |
316 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
317 | ||
318 | if (s->display == NULL) | |
319 | break; | |
320 | ||
321 | /* Setup to always have a local .Xauthority. */ | |
322 | xauthfile = xmalloc(MAXPATHLEN); | |
323 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
324 | temporarily_use_uid(pw->pw_uid); | |
325 | if (mkdtemp(xauthfile) == NULL) { | |
326 | restore_uid(); | |
327 | error("private X11 dir: mkdtemp %s failed: %s", | |
328 | xauthfile, strerror(errno)); | |
329 | xfree(xauthfile); | |
330 | xauthfile = NULL; | |
0b242b12 | 331 | /* XXXX remove listening channels */ |
7368a6c8 | 332 | break; |
333 | } | |
334 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
335 | open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); | |
336 | restore_uid(); | |
337 | fatal_add_cleanup(xauthfile_cleanup_proc, NULL); | |
338 | success = 1; | |
339 | break; | |
7368a6c8 | 340 | |
341 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
342 | if (no_agent_forwarding_flag || compat13) { | |
343 | debug("Authentication agent forwarding not permitted for this authentication."); | |
344 | break; | |
345 | } | |
346 | debug("Received authentication agent forwarding request."); | |
6fc1e9f3 | 347 | success = auth_input_request_forwarding(pw); |
7368a6c8 | 348 | break; |
349 | ||
350 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
351 | if (no_port_forwarding_flag) { | |
352 | debug("Port forwarding not permitted for this authentication."); | |
353 | break; | |
354 | } | |
355 | debug("Received TCP/IP port forwarding request."); | |
1d1ffb87 | 356 | channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 357 | success = 1; |
358 | break; | |
359 | ||
360 | case SSH_CMSG_MAX_PACKET_SIZE: | |
361 | if (packet_set_maxsize(packet_get_int()) > 0) | |
362 | success = 1; | |
363 | break; | |
364 | ||
365 | case SSH_CMSG_EXEC_SHELL: | |
366 | case SSH_CMSG_EXEC_CMD: | |
367 | /* Set interactive/non-interactive mode. */ | |
368 | packet_set_interactive(have_pty || s->display != NULL, | |
369 | options.keepalives); | |
370 | ||
371 | if (type == SSH_CMSG_EXEC_CMD) { | |
372 | command = packet_get_string(&dlen); | |
373 | debug("Exec command '%.500s'", command); | |
374 | packet_integrity_check(plen, 4 + dlen, type); | |
375 | } else { | |
376 | command = NULL; | |
377 | packet_integrity_check(plen, 0, type); | |
378 | } | |
379 | if (forced_command != NULL) { | |
380 | command = forced_command; | |
381 | debug("Forced command '%.500s'", forced_command); | |
382 | } | |
383 | if (have_pty) | |
384 | do_exec_pty(s, command, pw); | |
385 | else | |
386 | do_exec_no_pty(s, command, pw); | |
387 | ||
388 | if (command != NULL) | |
389 | xfree(command); | |
390 | /* Cleanup user's local Xauthority file. */ | |
391 | if (xauthfile) | |
392 | xauthfile_cleanup_proc(NULL); | |
393 | return; | |
394 | ||
395 | default: | |
396 | /* | |
397 | * Any unknown messages in this phase are ignored, | |
398 | * and a failure message is returned. | |
399 | */ | |
400 | log("Unknown packet type received after authentication: %d", type); | |
401 | } | |
402 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
403 | packet_send(); | |
404 | packet_write_wait(); | |
405 | ||
406 | /* Enable compression now that we have replied if appropriate. */ | |
407 | if (enable_compression_after_reply) { | |
408 | enable_compression_after_reply = 0; | |
409 | packet_start_compression(compression_level); | |
410 | } | |
411 | } | |
412 | } | |
413 | ||
414 | /* | |
415 | * This is called to fork and execute a command when we have no tty. This | |
416 | * will call do_child from the child, and server_loop from the parent after | |
417 | * setting up file descriptors and such. | |
418 | */ | |
6ae2364d | 419 | void |
7368a6c8 | 420 | do_exec_no_pty(Session *s, const char *command, struct passwd * pw) |
421 | { | |
422 | int pid; | |
423 | ||
424 | #ifdef USE_PIPES | |
425 | int pin[2], pout[2], perr[2]; | |
426 | /* Allocate pipes for communicating with the program. */ | |
427 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
428 | packet_disconnect("Could not create pipes: %.100s", | |
429 | strerror(errno)); | |
430 | #else /* USE_PIPES */ | |
431 | int inout[2], err[2]; | |
432 | /* Uses socket pairs to communicate with the program. */ | |
433 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
434 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
435 | packet_disconnect("Could not create socket pairs: %.100s", | |
436 | strerror(errno)); | |
437 | #endif /* USE_PIPES */ | |
438 | if (s == NULL) | |
439 | fatal("do_exec_no_pty: no session"); | |
440 | ||
1d1ffb87 | 441 | session_proctitle(s); |
7368a6c8 | 442 | |
443 | #ifdef USE_PAM | |
444 | do_pam_setcred(); | |
445 | #endif /* USE_PAM */ | |
446 | ||
447 | /* Fork the child. */ | |
448 | if ((pid = fork()) == 0) { | |
449 | /* Child. Reinitialize the log since the pid has changed. */ | |
450 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
451 | ||
452 | /* | |
453 | * Create a new session and process group since the 4.4BSD | |
454 | * setlogin() affects the entire process group. | |
455 | */ | |
456 | if (setsid() < 0) | |
457 | error("setsid failed: %.100s", strerror(errno)); | |
458 | ||
459 | #ifdef USE_PIPES | |
460 | /* | |
461 | * Redirect stdin. We close the parent side of the socket | |
462 | * pair, and make the child side the standard input. | |
463 | */ | |
464 | close(pin[1]); | |
465 | if (dup2(pin[0], 0) < 0) | |
466 | perror("dup2 stdin"); | |
467 | close(pin[0]); | |
468 | ||
469 | /* Redirect stdout. */ | |
470 | close(pout[0]); | |
471 | if (dup2(pout[1], 1) < 0) | |
472 | perror("dup2 stdout"); | |
473 | close(pout[1]); | |
474 | ||
475 | /* Redirect stderr. */ | |
476 | close(perr[0]); | |
477 | if (dup2(perr[1], 2) < 0) | |
478 | perror("dup2 stderr"); | |
479 | close(perr[1]); | |
480 | #else /* USE_PIPES */ | |
481 | /* | |
482 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
483 | * use the same socket, as some programs (particularly rdist) | |
484 | * seem to depend on it. | |
485 | */ | |
486 | close(inout[1]); | |
487 | close(err[1]); | |
488 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
489 | perror("dup2 stdin"); | |
490 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
491 | perror("dup2 stdout"); | |
492 | if (dup2(err[0], 2) < 0) /* stderr */ | |
493 | perror("dup2 stderr"); | |
494 | #endif /* USE_PIPES */ | |
495 | ||
496 | /* Do processing for the child (exec command etc). */ | |
497 | do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL); | |
498 | /* NOTREACHED */ | |
499 | } | |
500 | if (pid < 0) | |
501 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
502 | s->pid = pid; | |
503 | #ifdef USE_PIPES | |
504 | /* We are the parent. Close the child sides of the pipes. */ | |
505 | close(pin[0]); | |
506 | close(pout[1]); | |
507 | close(perr[1]); | |
508 | ||
e78a59f5 | 509 | if (compat20) { |
0b242b12 | 510 | session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1); |
e78a59f5 | 511 | } else { |
512 | /* Enter the interactive session. */ | |
513 | server_loop(pid, pin[1], pout[0], perr[0]); | |
514 | /* server_loop has closed pin[1], pout[1], and perr[1]. */ | |
515 | } | |
7368a6c8 | 516 | #else /* USE_PIPES */ |
517 | /* We are the parent. Close the child sides of the socket pairs. */ | |
518 | close(inout[0]); | |
519 | close(err[0]); | |
520 | ||
521 | /* | |
522 | * Enter the interactive session. Note: server_loop must be able to | |
523 | * handle the case that fdin and fdout are the same. | |
524 | */ | |
e78a59f5 | 525 | if (compat20) { |
0b242b12 | 526 | session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1); |
e78a59f5 | 527 | } else { |
528 | server_loop(pid, inout[1], inout[1], err[1]); | |
529 | /* server_loop has closed inout[1] and err[1]. */ | |
530 | } | |
7368a6c8 | 531 | #endif /* USE_PIPES */ |
532 | } | |
533 | ||
534 | /* | |
535 | * This is called to fork and execute a command when we have a tty. This | |
536 | * will call do_child from the child, and server_loop from the parent after | |
537 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
538 | * lastlog, and other such operations. | |
539 | */ | |
6ae2364d | 540 | void |
7368a6c8 | 541 | do_exec_pty(Session *s, const char *command, struct passwd * pw) |
542 | { | |
7368a6c8 | 543 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 544 | pid_t pid; |
7368a6c8 | 545 | |
546 | if (s == NULL) | |
547 | fatal("do_exec_pty: no session"); | |
548 | ptyfd = s->ptyfd; | |
549 | ttyfd = s->ttyfd; | |
550 | ||
7368a6c8 | 551 | #ifdef USE_PAM |
552 | do_pam_session(pw->pw_name, s->tty); | |
553 | do_pam_setcred(); | |
554 | #endif /* USE_PAM */ | |
555 | ||
556 | /* Fork the child. */ | |
557 | if ((pid = fork()) == 0) { | |
c345cf9d | 558 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 559 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
560 | ||
561 | /* Close the master side of the pseudo tty. */ | |
562 | close(ptyfd); | |
563 | ||
564 | /* Make the pseudo tty our controlling tty. */ | |
565 | pty_make_controlling_tty(&ttyfd, s->tty); | |
566 | ||
567 | /* Redirect stdin from the pseudo tty. */ | |
568 | if (dup2(ttyfd, fileno(stdin)) < 0) | |
569 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
570 | ||
571 | /* Redirect stdout to the pseudo tty. */ | |
572 | if (dup2(ttyfd, fileno(stdout)) < 0) | |
573 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
574 | ||
575 | /* Redirect stderr to the pseudo tty. */ | |
576 | if (dup2(ttyfd, fileno(stderr)) < 0) | |
577 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
578 | ||
579 | /* Close the extra descriptor for the pseudo tty. */ | |
580 | close(ttyfd); | |
581 | ||
c345cf9d | 582 | /* record login, etc. similar to login(1) */ |
583 | if (command == NULL && !options.use_login) | |
584 | do_login(s); | |
7368a6c8 | 585 | |
7368a6c8 | 586 | /* Do common processing for the child, such as execing the command. */ |
71276795 | 587 | do_child(command, pw, s->term, s->display, s->auth_proto, |
588 | s->auth_data, s->tty); | |
7368a6c8 | 589 | /* NOTREACHED */ |
590 | } | |
591 | if (pid < 0) | |
592 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
593 | s->pid = pid; | |
594 | ||
595 | /* Parent. Close the slave side of the pseudo tty. */ | |
596 | close(ttyfd); | |
597 | ||
598 | /* | |
599 | * Create another descriptor of the pty master side for use as the | |
600 | * standard input. We could use the original descriptor, but this | |
601 | * simplifies code in server_loop. The descriptor is bidirectional. | |
602 | */ | |
603 | fdout = dup(ptyfd); | |
604 | if (fdout < 0) | |
605 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
606 | ||
607 | /* we keep a reference to the pty master */ | |
608 | ptymaster = dup(ptyfd); | |
609 | if (ptymaster < 0) | |
610 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
611 | s->ptymaster = ptymaster; | |
612 | ||
613 | /* Enter interactive session. */ | |
e78a59f5 | 614 | if (compat20) { |
615 | session_set_fds(s, ptyfd, fdout, -1); | |
616 | } else { | |
617 | server_loop(pid, ptyfd, fdout, -1); | |
618 | /* server_loop _has_ closed ptyfd and fdout. */ | |
619 | session_pty_cleanup(s); | |
620 | } | |
7368a6c8 | 621 | } |
622 | ||
c345cf9d | 623 | const char * |
624 | get_remote_name_or_ip(void) | |
625 | { | |
626 | static const char *remote = ""; | |
627 | if (utmp_len > 0) | |
628 | remote = get_canonical_hostname(); | |
629 | if (utmp_len == 0 || strlen(remote) > utmp_len) | |
630 | remote = get_remote_ipaddr(); | |
631 | return remote; | |
632 | } | |
633 | ||
634 | /* administrative, login(1)-like work */ | |
635 | void | |
636 | do_login(Session *s) | |
637 | { | |
638 | FILE *f; | |
639 | char *time_string; | |
640 | char buf[256]; | |
641 | socklen_t fromlen; | |
642 | struct sockaddr_storage from; | |
643 | struct stat st; | |
644 | time_t last_login_time; | |
645 | struct passwd * pw = s->pw; | |
646 | pid_t pid = getpid(); | |
647 | ||
648 | /* | |
649 | * Get IP address of client. If the connection is not a socket, let | |
650 | * the address be 0.0.0.0. | |
651 | */ | |
652 | memset(&from, 0, sizeof(from)); | |
653 | if (packet_connection_is_on_socket()) { | |
654 | fromlen = sizeof(from); | |
655 | if (getpeername(packet_get_connection_in(), | |
656 | (struct sockaddr *) & from, &fromlen) < 0) { | |
657 | debug("getpeername: %.100s", strerror(errno)); | |
658 | fatal_cleanup(); | |
659 | } | |
660 | } | |
661 | ||
662 | /* Record that there was a login on that tty from the remote host. */ | |
663 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
664 | get_remote_name_or_ip(), (struct sockaddr *)&from); | |
665 | ||
666 | /* Done if .hushlogin exists. */ | |
667 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
2e73a022 | 668 | #ifdef HAVE_LOGIN_CAP |
669 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
670 | #else | |
c345cf9d | 671 | if (stat(buf, &st) >= 0) |
2e73a022 | 672 | #endif |
c345cf9d | 673 | return; |
674 | ||
675 | #ifdef USE_PAM | |
676 | print_pam_messages(); | |
677 | #endif /* USE_PAM */ | |
678 | #ifdef WITH_AIXAUTHENTICATE | |
679 | if (aixloginmsg && *aixloginmsg) | |
680 | printf("%s\n", aixloginmsg); | |
681 | #endif /* WITH_AIXAUTHENTICATE */ | |
682 | ||
683 | /* | |
684 | * Get the time when the user last logged in. 'buf' will be set | |
685 | * to contain the hostname the last login was from. | |
686 | */ | |
687 | last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name, | |
688 | buf, sizeof(buf)); | |
689 | if (last_login_time != 0) { | |
690 | time_string = ctime(&last_login_time); | |
691 | if (strchr(time_string, '\n')) | |
692 | *strchr(time_string, '\n') = 0; | |
693 | if (strcmp(buf, "") == 0) | |
694 | printf("Last login: %s\r\n", time_string); | |
695 | else | |
696 | printf("Last login: %s from %s\r\n", time_string, buf); | |
697 | } | |
698 | if (options.print_motd) { | |
2e73a022 | 699 | #ifdef HAVE_LOGIN_CAP |
700 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
701 | "/etc/motd"), "r"); | |
702 | #else | |
c345cf9d | 703 | f = fopen("/etc/motd", "r"); |
2e73a022 | 704 | #endif |
c345cf9d | 705 | if (f) { |
706 | while (fgets(buf, sizeof(buf), f)) | |
707 | fputs(buf, stdout); | |
708 | fclose(f); | |
709 | } | |
710 | } | |
711 | } | |
712 | ||
7368a6c8 | 713 | /* |
714 | * Sets the value of the given variable in the environment. If the variable | |
715 | * already exists, its value is overriden. | |
716 | */ | |
6ae2364d | 717 | void |
7368a6c8 | 718 | child_set_env(char ***envp, unsigned int *envsizep, const char *name, |
719 | const char *value) | |
720 | { | |
721 | unsigned int i, namelen; | |
722 | char **env; | |
723 | ||
724 | /* | |
725 | * Find the slot where the value should be stored. If the variable | |
726 | * already exists, we reuse the slot; otherwise we append a new slot | |
727 | * at the end of the array, expanding if necessary. | |
728 | */ | |
729 | env = *envp; | |
730 | namelen = strlen(name); | |
731 | for (i = 0; env[i]; i++) | |
732 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
733 | break; | |
734 | if (env[i]) { | |
735 | /* Reuse the slot. */ | |
736 | xfree(env[i]); | |
737 | } else { | |
738 | /* New variable. Expand if necessary. */ | |
739 | if (i >= (*envsizep) - 1) { | |
740 | (*envsizep) += 50; | |
741 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
742 | } | |
743 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
744 | env[i + 1] = NULL; | |
745 | } | |
746 | ||
747 | /* Allocate space and format the variable in the appropriate slot. */ | |
748 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
749 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
750 | } | |
751 | ||
752 | /* | |
753 | * Reads environment variables from the given file and adds/overrides them | |
754 | * into the environment. If the file does not exist, this does nothing. | |
755 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
756 | * and assignments of the form name=value. No other forms are allowed. | |
757 | */ | |
6ae2364d | 758 | void |
7368a6c8 | 759 | read_environment_file(char ***env, unsigned int *envsize, |
760 | const char *filename) | |
761 | { | |
762 | FILE *f; | |
763 | char buf[4096]; | |
764 | char *cp, *value; | |
765 | ||
766 | f = fopen(filename, "r"); | |
767 | if (!f) | |
768 | return; | |
769 | ||
770 | while (fgets(buf, sizeof(buf), f)) { | |
771 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
772 | ; | |
773 | if (!*cp || *cp == '#' || *cp == '\n') | |
774 | continue; | |
775 | if (strchr(cp, '\n')) | |
776 | *strchr(cp, '\n') = '\0'; | |
777 | value = strchr(cp, '='); | |
778 | if (value == NULL) { | |
779 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
780 | continue; | |
781 | } | |
71276795 | 782 | /* |
783 | * Replace the equals sign by nul, and advance value to | |
784 | * the value string. | |
785 | */ | |
7368a6c8 | 786 | *value = '\0'; |
787 | value++; | |
788 | child_set_env(env, envsize, cp, value); | |
789 | } | |
790 | fclose(f); | |
791 | } | |
792 | ||
793 | #ifdef USE_PAM | |
794 | /* | |
795 | * Sets any environment variables which have been specified by PAM | |
796 | */ | |
797 | void do_pam_environment(char ***env, int *envsize) | |
798 | { | |
799 | char *equals, var_name[512], var_val[512]; | |
800 | char **pam_env; | |
801 | int i; | |
802 | ||
803 | if ((pam_env = fetch_pam_environment()) == NULL) | |
804 | return; | |
805 | ||
806 | for(i = 0; pam_env[i] != NULL; i++) { | |
807 | if ((equals = strstr(pam_env[i], "=")) == NULL) | |
808 | continue; | |
809 | ||
810 | if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) { | |
811 | memset(var_name, '\0', sizeof(var_name)); | |
812 | memset(var_val, '\0', sizeof(var_val)); | |
813 | ||
814 | strncpy(var_name, pam_env[i], equals - pam_env[i]); | |
815 | strcpy(var_val, equals + 1); | |
816 | ||
817 | debug("PAM environment: %s=%s", var_name, var_val); | |
818 | ||
819 | child_set_env(env, envsize, var_name, var_val); | |
820 | } | |
821 | } | |
822 | } | |
823 | #endif /* USE_PAM */ | |
824 | ||
5fa45897 | 825 | #if defined(HAVE_GETUSERATTR) |
826 | /* | |
827 | * AIX-specific login initialisation | |
828 | */ | |
829 | void set_limit(char *user, char *soft, char *hard, int resource, int mult) | |
830 | { | |
831 | struct rlimit rlim; | |
56118702 | 832 | int slim, hlim; |
5fa45897 | 833 | |
834 | getrlimit(resource, &rlim); | |
835 | ||
56118702 | 836 | slim = 0; |
837 | if (getuserattr(user, soft, &slim, SEC_INT) != -1) { | |
838 | if (slim < 0) { | |
839 | rlim.rlim_cur = RLIM_INFINITY; | |
840 | } else if (slim != 0) { | |
841 | /* See the wackiness below */ | |
842 | if (rlim.rlim_cur == slim * mult) | |
843 | slim = 0; | |
844 | else | |
845 | rlim.rlim_cur = slim * mult; | |
846 | } | |
847 | } | |
5fa45897 | 848 | |
56118702 | 849 | hlim = 0; |
850 | if (getuserattr(user, hard, &hlim, SEC_INT) != -1) { | |
851 | if (hlim < 0) { | |
852 | rlim.rlim_max = RLIM_INFINITY; | |
853 | } else if (hlim != 0) { | |
854 | rlim.rlim_max = hlim * mult; | |
855 | } | |
856 | } | |
5fa45897 | 857 | |
56118702 | 858 | /* |
859 | * XXX For cpu and fsize the soft limit is set to the hard limit | |
860 | * if the hard limit is left at its default value and the soft limit | |
861 | * is changed from its default value, either by requesting it | |
862 | * (slim == 0) or by setting it to the current default. At least | |
863 | * that's how rlogind does it. If you're confused you're not alone. | |
864 | * Bug or feature? AIX 4.3.1.2 | |
865 | */ | |
866 | if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu")) | |
867 | && hlim == 0 && slim != 0) | |
868 | rlim.rlim_max = rlim.rlim_cur; | |
869 | /* A specified hard limit limits the soft limit */ | |
870 | else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max) | |
871 | rlim.rlim_cur = rlim.rlim_max; | |
872 | /* A soft limit can increase a hard limit */ | |
873 | else if (rlim.rlim_cur > rlim.rlim_max) | |
5fa45897 | 874 | rlim.rlim_max = rlim.rlim_cur; |
875 | ||
876 | if (setrlimit(resource, &rlim) != 0) | |
56118702 | 877 | error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno)); |
5fa45897 | 878 | } |
879 | ||
880 | void set_limits_from_userattr(char *user) | |
881 | { | |
882 | int mask; | |
883 | char buf[16]; | |
884 | ||
885 | set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512); | |
886 | set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1); | |
887 | set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512); | |
888 | set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512); | |
889 | set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512); | |
890 | set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512); | |
891 | #if defined(S_UNOFILE) | |
892 | set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1); | |
893 | #endif | |
894 | ||
895 | if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) { | |
896 | /* Convert decimal to octal */ | |
897 | (void) snprintf(buf, sizeof(buf), "%d", mask); | |
898 | if (sscanf(buf, "%o", &mask) == 1) | |
899 | umask(mask); | |
900 | } | |
901 | } | |
902 | #endif /* defined(HAVE_GETUSERATTR) */ | |
903 | ||
7368a6c8 | 904 | /* |
905 | * Performs common processing for the child, such as setting up the | |
906 | * environment, closing extra file descriptors, setting the user and group | |
907 | * ids, and executing the command or shell. | |
908 | */ | |
6ae2364d | 909 | void |
7368a6c8 | 910 | do_child(const char *command, struct passwd * pw, const char *term, |
911 | const char *display, const char *auth_proto, | |
912 | const char *auth_data, const char *ttyname) | |
913 | { | |
2e73a022 | 914 | const char *shell, *hostname, *cp = NULL; |
7368a6c8 | 915 | char buf[256]; |
6fc1e9f3 | 916 | char cmd[1024]; |
2e73a022 | 917 | FILE *f = NULL; |
7368a6c8 | 918 | unsigned int envsize, i; |
919 | char **env; | |
920 | extern char **environ; | |
921 | struct stat st; | |
922 | char *argv[10]; | |
3206bb3b | 923 | #ifdef WITH_IRIX_PROJECT |
924 | prid_t projid; | |
925 | #endif /* WITH_IRIX_PROJECT */ | |
7368a6c8 | 926 | |
fa649821 | 927 | /* login(1) is only called if we execute the login shell */ |
928 | if (options.use_login && command != NULL) | |
929 | options.use_login = 0; | |
930 | ||
7368a6c8 | 931 | #ifndef USE_PAM /* pam_nologin handles this */ |
2e73a022 | 932 | if (!options.use_login) { |
933 | # ifdef HAVE_LOGIN_CAP | |
934 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
935 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
936 | _PATH_NOLOGIN), "r"); | |
937 | # else /* HAVE_LOGIN_CAP */ | |
938 | if (pw->pw_uid) | |
939 | f = fopen(_PATH_NOLOGIN, "r"); | |
940 | # endif /* HAVE_LOGIN_CAP */ | |
941 | if (f) { | |
942 | /* /etc/nologin exists. Print its contents and exit. */ | |
943 | while (fgets(buf, sizeof(buf), f)) | |
944 | fputs(buf, stderr); | |
945 | fclose(f); | |
7368a6c8 | 946 | exit(254); |
2e73a022 | 947 | } |
7368a6c8 | 948 | } |
949 | #endif /* USE_PAM */ | |
950 | ||
2e73a022 | 951 | /* Set login name, uid, gid, and groups. */ |
7368a6c8 | 952 | /* Login(1) does this as well, and it needs uid 0 for the "-h" |
953 | switch, so we let login(1) to this for us. */ | |
954 | if (!options.use_login) { | |
4d33e531 | 955 | #ifdef HAVE_OSF_SIA |
956 | extern char **saved_argv; | |
957 | extern int saved_argc; | |
958 | char *host = get_canonical_hostname (); | |
959 | ||
960 | if (sia_become_user(NULL, saved_argc, saved_argv, host, | |
961 | pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) != | |
962 | SIASUCCESS) { | |
963 | perror("sia_become_user"); | |
964 | exit(1); | |
965 | } | |
966 | if (setreuid(geteuid(), geteuid()) < 0) { | |
967 | perror("setreuid"); | |
968 | exit(1); | |
969 | } | |
970 | #else /* HAVE_OSF_SIA */ | |
7368a6c8 | 971 | if (getuid() == 0 || geteuid() == 0) { |
2e73a022 | 972 | # ifdef HAVE_GETUSERATTR |
5fa45897 | 973 | set_limits_from_userattr(pw->pw_name); |
2e73a022 | 974 | # endif /* HAVE_GETUSERATTR */ |
975 | # ifdef HAVE_LOGIN_CAP | |
976 | if (setusercontext(lc, pw, pw->pw_uid, | |
977 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
978 | perror("unable to set user context"); | |
979 | exit(1); | |
980 | } | |
981 | # else /* HAVE_LOGIN_CAP */ | |
982 | if (setlogin(pw->pw_name) < 0) | |
983 | error("setlogin failed: %s", strerror(errno)); | |
7368a6c8 | 984 | if (setgid(pw->pw_gid) < 0) { |
985 | perror("setgid"); | |
986 | exit(1); | |
987 | } | |
988 | /* Initialize the group list. */ | |
989 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
990 | perror("initgroups"); | |
991 | exit(1); | |
992 | } | |
993 | endgrent(); | |
2e73a022 | 994 | # ifdef WITH_IRIX_ARRAY |
3206bb3b | 995 | /* initialize array session */ |
996 | if (newarraysess() != 0) | |
997 | fatal("Failed to set up new array session: %.100s", | |
998 | strerror(errno)); | |
2e73a022 | 999 | # endif /* WITH_IRIX_ARRAY */ |
1000 | # ifdef WITH_IRIX_PROJECT | |
3206bb3b | 1001 | /* initialize irix project info */ |
1002 | if ((projid = getdfltprojuser(pw->pw_name)) == -1) { | |
1003 | debug("Failed to get project id, using projid 0"); | |
1004 | projid = 0; | |
1005 | } | |
3206bb3b | 1006 | if (setprid(projid)) |
1007 | fatal("Failed to initialize project %d for %s: %.100s", | |
1008 | (int)projid, pw->pw_name, strerror(errno)); | |
2e73a022 | 1009 | # endif /* WITH_IRIX_PROJECT */ |
7368a6c8 | 1010 | /* Permanently switch to the desired uid. */ |
1011 | permanently_set_uid(pw->pw_uid); | |
2e73a022 | 1012 | # endif /* HAVE_LOGIN_CAP */ |
7368a6c8 | 1013 | } |
2e73a022 | 1014 | #endif /* HAVE_OSF_SIA */ |
1015 | ||
7368a6c8 | 1016 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
14a9a859 | 1017 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
7368a6c8 | 1018 | } |
1019 | /* | |
1020 | * Get the shell from the password data. An empty shell field is | |
1021 | * legal, and means /bin/sh. | |
1022 | */ | |
1023 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
2e73a022 | 1024 | #ifdef HAVE_LOGIN_CAP |
1025 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1026 | #endif | |
7368a6c8 | 1027 | |
1028 | #ifdef AFS | |
1029 | /* Try to get AFS tokens for the local cell. */ | |
1030 | if (k_hasafs()) { | |
1031 | char cell[64]; | |
1032 | ||
1033 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1034 | krb_afslog(cell, 0); | |
1035 | ||
1036 | krb_afslog(0, 0); | |
1037 | } | |
1038 | #endif /* AFS */ | |
1039 | ||
1040 | /* Initialize the environment. */ | |
1041 | envsize = 100; | |
1042 | env = xmalloc(envsize * sizeof(char *)); | |
1043 | env[0] = NULL; | |
1044 | ||
1045 | if (!options.use_login) { | |
1046 | /* Set basic environment. */ | |
1047 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1048 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1049 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
2e73a022 | 1050 | #ifdef HAVE_LOGIN_CAP |
1051 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH); | |
1052 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
1053 | #else | |
7368a6c8 | 1054 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
2e73a022 | 1055 | #endif |
7368a6c8 | 1056 | |
1057 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1058 | _PATH_MAILDIR, pw->pw_name); | |
1059 | child_set_env(&env, &envsize, "MAIL", buf); | |
1060 | ||
1061 | /* Normal systems set SHELL by default. */ | |
1062 | child_set_env(&env, &envsize, "SHELL", shell); | |
1063 | } | |
1064 | if (getenv("TZ")) | |
1065 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1066 | ||
1067 | /* Set custom environment options from RSA authentication. */ | |
1068 | while (custom_environment) { | |
1069 | struct envstring *ce = custom_environment; | |
1070 | char *s = ce->s; | |
1071 | int i; | |
1072 | for (i = 0; s[i] != '=' && s[i]; i++); | |
1073 | if (s[i] == '=') { | |
1074 | s[i] = 0; | |
1075 | child_set_env(&env, &envsize, s, s + i + 1); | |
1076 | } | |
1077 | custom_environment = ce->next; | |
1078 | xfree(ce->s); | |
1079 | xfree(ce); | |
1080 | } | |
1081 | ||
1082 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
1083 | get_remote_ipaddr(), get_remote_port(), get_local_port()); | |
1084 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); | |
1085 | ||
1086 | if (ttyname) | |
1087 | child_set_env(&env, &envsize, "SSH_TTY", ttyname); | |
1088 | if (term) | |
1089 | child_set_env(&env, &envsize, "TERM", term); | |
1090 | if (display) | |
1091 | child_set_env(&env, &envsize, "DISPLAY", display); | |
1092 | ||
1093 | #ifdef _AIX | |
1094 | { | |
1095 | char *authstate,*krb5cc; | |
1096 | ||
1097 | if ((authstate = getenv("AUTHSTATE")) != NULL) | |
1098 | child_set_env(&env,&envsize,"AUTHSTATE",authstate); | |
1099 | ||
1100 | if ((krb5cc = getenv("KRB5CCNAME")) != NULL) | |
1101 | child_set_env(&env,&envsize,"KRB5CCNAME",krb5cc); | |
1102 | } | |
1103 | #endif | |
1104 | ||
1105 | #ifdef KRB4 | |
1106 | { | |
1107 | extern char *ticket; | |
1108 | ||
1109 | if (ticket) | |
1110 | child_set_env(&env, &envsize, "KRBTKFILE", ticket); | |
1111 | } | |
1112 | #endif /* KRB4 */ | |
1113 | ||
1114 | #ifdef USE_PAM | |
1115 | /* Pull in any environment variables that may have been set by PAM. */ | |
1116 | do_pam_environment(&env, &envsize); | |
1117 | #endif /* USE_PAM */ | |
1118 | ||
1119 | read_environment_file(&env,&envsize,"/etc/environment"); | |
1120 | ||
1121 | if (xauthfile) | |
1122 | child_set_env(&env, &envsize, "XAUTHORITY", xauthfile); | |
1123 | if (auth_get_socket_name() != NULL) | |
1124 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, | |
1125 | auth_get_socket_name()); | |
1126 | ||
1127 | /* read $HOME/.ssh/environment. */ | |
1128 | if (!options.use_login) { | |
71276795 | 1129 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1130 | pw->pw_dir); | |
7368a6c8 | 1131 | read_environment_file(&env, &envsize, buf); |
1132 | } | |
1133 | if (debug_flag) { | |
1134 | /* dump the environment */ | |
1135 | fprintf(stderr, "Environment:\n"); | |
1136 | for (i = 0; env[i]; i++) | |
1137 | fprintf(stderr, " %.200s\n", env[i]); | |
1138 | } | |
2e73a022 | 1139 | /* we have to stash the hostname before we close our socket. */ |
1140 | if (options.use_login) | |
1141 | hostname = get_remote_name_or_ip(); | |
7368a6c8 | 1142 | /* |
1143 | * Close the connection descriptors; note that this is the child, and | |
1144 | * the server will still have the socket open, and it is important | |
1145 | * that we do not shutdown it. Note that the descriptors cannot be | |
1146 | * closed before building the environment, as we call | |
1147 | * get_remote_ipaddr there. | |
1148 | */ | |
1149 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1150 | close(packet_get_connection_in()); | |
1151 | else { | |
1152 | close(packet_get_connection_in()); | |
1153 | close(packet_get_connection_out()); | |
1154 | } | |
1155 | /* | |
1156 | * Close all descriptors related to channels. They will still remain | |
1157 | * open in the parent. | |
1158 | */ | |
1159 | /* XXX better use close-on-exec? -markus */ | |
1160 | channel_close_all(); | |
1161 | ||
1162 | /* | |
1163 | * Close any extra file descriptors. Note that there may still be | |
1164 | * descriptors left by system functions. They will be closed later. | |
1165 | */ | |
1166 | endpwent(); | |
1167 | ||
1168 | /* | |
1169 | * Close any extra open file descriptors so that we don\'t have them | |
1170 | * hanging around in clients. Note that we want to do this after | |
1171 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1172 | * descriptors open. | |
1173 | */ | |
1174 | for (i = 3; i < 64; i++) | |
1175 | close(i); | |
1176 | ||
1177 | /* Change current directory to the user\'s home directory. */ | |
2e73a022 | 1178 | if (chdir(pw->pw_dir) < 0) { |
7368a6c8 | 1179 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", |
1180 | pw->pw_dir, strerror(errno)); | |
2e73a022 | 1181 | #ifdef HAVE_LOGIN_CAP |
1182 | if (login_getcapbool(lc, "requirehome", 0)) | |
1183 | exit(1); | |
1184 | #endif | |
1185 | } | |
7368a6c8 | 1186 | |
1187 | /* | |
1188 | * Must take new environment into use so that .ssh/rc, /etc/sshrc and | |
1189 | * xauth are run in the proper environment. | |
1190 | */ | |
1191 | environ = env; | |
1192 | ||
1193 | /* | |
1194 | * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first | |
1195 | * in this order). | |
1196 | */ | |
1197 | if (!options.use_login) { | |
1198 | if (stat(SSH_USER_RC, &st) >= 0) { | |
1199 | if (debug_flag) | |
30228d7c | 1200 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_USER_RC); |
7368a6c8 | 1201 | |
30228d7c | 1202 | f = popen(_PATH_BSHELL " " SSH_USER_RC, "w"); |
7368a6c8 | 1203 | if (f) { |
1204 | if (auth_proto != NULL && auth_data != NULL) | |
1205 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1206 | pclose(f); | |
1207 | } else | |
1208 | fprintf(stderr, "Could not run %s\n", SSH_USER_RC); | |
1209 | } else if (stat(SSH_SYSTEM_RC, &st) >= 0) { | |
1210 | if (debug_flag) | |
30228d7c | 1211 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_SYSTEM_RC); |
7368a6c8 | 1212 | |
30228d7c | 1213 | f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w"); |
7368a6c8 | 1214 | if (f) { |
1215 | if (auth_proto != NULL && auth_data != NULL) | |
1216 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1217 | pclose(f); | |
1218 | } else | |
1219 | fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC); | |
6fc1e9f3 | 1220 | } else if (options.xauth_location != NULL) { |
7368a6c8 | 1221 | /* Add authority data to .Xauthority if appropriate. */ |
1222 | if (auth_proto != NULL && auth_data != NULL) { | |
29611d9c | 1223 | char *screen = strchr(display, ':'); |
1224 | if (debug_flag) { | |
71276795 | 1225 | fprintf(stderr, |
1226 | "Running %.100s add %.100s %.100s %.100s\n", | |
6fc1e9f3 | 1227 | options.xauth_location, display, |
1228 | auth_proto, auth_data); | |
29611d9c | 1229 | if (screen != NULL) |
71276795 | 1230 | fprintf(stderr, |
1231 | "Adding %.*s/unix%s %s %s\n", | |
14a9a859 | 1232 | (int)(screen-display), display, |
71276795 | 1233 | screen, auth_proto, auth_data); |
29611d9c | 1234 | } |
6fc1e9f3 | 1235 | snprintf(cmd, sizeof cmd, "%s -q -", |
1236 | options.xauth_location); | |
1237 | f = popen(cmd, "w"); | |
7368a6c8 | 1238 | if (f) { |
71276795 | 1239 | fprintf(f, "add %s %s %s\n", display, |
1240 | auth_proto, auth_data); | |
29611d9c | 1241 | if (screen != NULL) |
1242 | fprintf(f, "add %.*s/unix%s %s %s\n", | |
14a9a859 | 1243 | (int)(screen-display), display, |
71276795 | 1244 | screen, auth_proto, auth_data); |
7368a6c8 | 1245 | pclose(f); |
6fc1e9f3 | 1246 | } else { |
1247 | fprintf(stderr, "Could not run %s\n", | |
1248 | cmd); | |
1249 | } | |
7368a6c8 | 1250 | } |
1251 | } | |
7368a6c8 | 1252 | /* Get the last component of the shell name. */ |
1253 | cp = strrchr(shell, '/'); | |
1254 | if (cp) | |
1255 | cp++; | |
1256 | else | |
1257 | cp = shell; | |
1258 | } | |
1259 | /* | |
1260 | * If we have no command, execute the shell. In this case, the shell | |
1261 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1262 | * this is a login shell. | |
1263 | */ | |
1264 | if (!command) { | |
1265 | if (!options.use_login) { | |
1266 | char buf[256]; | |
1267 | ||
1268 | /* | |
1269 | * Check for mail if we have a tty and it was enabled | |
1270 | * in server options. | |
1271 | */ | |
1272 | if (ttyname && options.check_mail) { | |
1273 | char *mailbox; | |
1274 | struct stat mailstat; | |
1275 | mailbox = getenv("MAIL"); | |
1276 | if (mailbox != NULL) { | |
71276795 | 1277 | if (stat(mailbox, &mailstat) != 0 || |
1278 | mailstat.st_size == 0) | |
7368a6c8 | 1279 | printf("No mail.\n"); |
1280 | else if (mailstat.st_mtime < mailstat.st_atime) | |
1281 | printf("You have mail.\n"); | |
1282 | else | |
1283 | printf("You have new mail.\n"); | |
1284 | } | |
1285 | } | |
1286 | /* Start the shell. Set initial character to '-'. */ | |
1287 | buf[0] = '-'; | |
1288 | strncpy(buf + 1, cp, sizeof(buf) - 1); | |
1289 | buf[sizeof(buf) - 1] = 0; | |
1290 | ||
1291 | /* Execute the shell. */ | |
1292 | argv[0] = buf; | |
1293 | argv[1] = NULL; | |
1294 | execve(shell, argv, env); | |
1295 | ||
1296 | /* Executing the shell failed. */ | |
1297 | perror(shell); | |
1298 | exit(1); | |
1299 | ||
1300 | } else { | |
1301 | /* Launch login(1). */ | |
1302 | ||
2e73a022 | 1303 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
c345cf9d | 1304 | "-p", "-f", "--", pw->pw_name, NULL); |
7368a6c8 | 1305 | |
1306 | /* Login couldn't be executed, die. */ | |
1307 | ||
1308 | perror("login"); | |
1309 | exit(1); | |
1310 | } | |
1311 | } | |
1312 | /* | |
1313 | * Execute the command using the user's shell. This uses the -c | |
1314 | * option to execute the command. | |
1315 | */ | |
1316 | argv[0] = (char *) cp; | |
1317 | argv[1] = "-c"; | |
1318 | argv[2] = (char *) command; | |
1319 | argv[3] = NULL; | |
1320 | execve(shell, argv, env); | |
1321 | perror(shell); | |
1322 | exit(1); | |
1323 | } | |
1324 | ||
1325 | Session * | |
1326 | session_new(void) | |
1327 | { | |
1328 | int i; | |
1329 | static int did_init = 0; | |
1330 | if (!did_init) { | |
1331 | debug("session_new: init"); | |
1332 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1333 | sessions[i].used = 0; | |
1334 | sessions[i].self = i; | |
1335 | } | |
1336 | did_init = 1; | |
1337 | } | |
1338 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1339 | Session *s = &sessions[i]; | |
1340 | if (! s->used) { | |
1341 | s->pid = 0; | |
0b242b12 | 1342 | s->extended = 0; |
7368a6c8 | 1343 | s->chanid = -1; |
1344 | s->ptyfd = -1; | |
1345 | s->ttyfd = -1; | |
1346 | s->term = NULL; | |
1347 | s->pw = NULL; | |
1348 | s->display = NULL; | |
1349 | s->screen = 0; | |
1350 | s->auth_data = NULL; | |
1351 | s->auth_proto = NULL; | |
1352 | s->used = 1; | |
0b242b12 | 1353 | s->pw = NULL; |
7368a6c8 | 1354 | debug("session_new: session %d", i); |
1355 | return s; | |
1356 | } | |
1357 | } | |
1358 | return NULL; | |
1359 | } | |
1360 | ||
1361 | void | |
1362 | session_dump(void) | |
1363 | { | |
1364 | int i; | |
1365 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1366 | Session *s = &sessions[i]; | |
1367 | debug("dump: used %d session %d %p channel %d pid %d", | |
1368 | s->used, | |
1369 | s->self, | |
1370 | s, | |
1371 | s->chanid, | |
1372 | s->pid); | |
1373 | } | |
1374 | } | |
1375 | ||
e78a59f5 | 1376 | int |
1377 | session_open(int chanid) | |
1378 | { | |
1379 | Session *s = session_new(); | |
1380 | debug("session_open: channel %d", chanid); | |
1381 | if (s == NULL) { | |
1382 | error("no more sessions"); | |
1383 | return 0; | |
1384 | } | |
e78a59f5 | 1385 | s->pw = auth_get_user(); |
1386 | if (s->pw == NULL) | |
0b242b12 | 1387 | fatal("no user for session %i", s->self); |
1388 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1389 | s->chanid = chanid; | |
e78a59f5 | 1390 | return 1; |
1391 | } | |
1392 | ||
1393 | Session * | |
1394 | session_by_channel(int id) | |
1395 | { | |
1396 | int i; | |
1397 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1398 | Session *s = &sessions[i]; | |
1399 | if (s->used && s->chanid == id) { | |
1400 | debug("session_by_channel: session %d channel %d", i, id); | |
1401 | return s; | |
1402 | } | |
1403 | } | |
1404 | debug("session_by_channel: unknown channel %d", id); | |
1405 | session_dump(); | |
1406 | return NULL; | |
1407 | } | |
1408 | ||
1409 | Session * | |
1410 | session_by_pid(pid_t pid) | |
1411 | { | |
1412 | int i; | |
1413 | debug("session_by_pid: pid %d", pid); | |
1414 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1415 | Session *s = &sessions[i]; | |
1416 | if (s->used && s->pid == pid) | |
1417 | return s; | |
1418 | } | |
1419 | error("session_by_pid: unknown pid %d", pid); | |
1420 | session_dump(); | |
1421 | return NULL; | |
1422 | } | |
1423 | ||
1424 | int | |
1425 | session_window_change_req(Session *s) | |
1426 | { | |
1427 | s->col = packet_get_int(); | |
1428 | s->row = packet_get_int(); | |
1429 | s->xpixel = packet_get_int(); | |
1430 | s->ypixel = packet_get_int(); | |
6ae2364d | 1431 | packet_done(); |
e78a59f5 | 1432 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1433 | return 1; | |
1434 | } | |
1435 | ||
1436 | int | |
1437 | session_pty_req(Session *s) | |
1438 | { | |
1439 | unsigned int len; | |
6ae2364d | 1440 | char *term_modes; /* encoded terminal modes */ |
e78a59f5 | 1441 | |
38c295d6 | 1442 | if (no_pty_flag) |
1443 | return 0; | |
e78a59f5 | 1444 | if (s->ttyfd != -1) |
6ae2364d | 1445 | return 0; |
e78a59f5 | 1446 | s->term = packet_get_string(&len); |
1447 | s->col = packet_get_int(); | |
1448 | s->row = packet_get_int(); | |
1449 | s->xpixel = packet_get_int(); | |
1450 | s->ypixel = packet_get_int(); | |
6ae2364d | 1451 | term_modes = packet_get_string(&len); |
1452 | packet_done(); | |
e78a59f5 | 1453 | |
1454 | if (strcmp(s->term, "") == 0) { | |
1455 | xfree(s->term); | |
1456 | s->term = NULL; | |
1457 | } | |
1458 | /* Allocate a pty and open it. */ | |
1459 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) { | |
1460 | xfree(s->term); | |
1461 | s->term = NULL; | |
1462 | s->ptyfd = -1; | |
1463 | s->ttyfd = -1; | |
1464 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1465 | xfree(term_modes); |
1466 | return 0; | |
e78a59f5 | 1467 | } |
1468 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1469 | /* | |
1470 | * Add a cleanup function to clear the utmp entry and record logout | |
1471 | * time in case we call fatal() (e.g., the connection gets closed). | |
1472 | */ | |
1473 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
1474 | pty_setowner(s->pw, s->tty); | |
1475 | /* Get window size from the packet. */ | |
1476 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1477 | ||
1d1ffb87 | 1478 | session_proctitle(s); |
1479 | ||
35484284 | 1480 | /* XXX parse and set terminal modes */ |
1481 | xfree(term_modes); | |
e78a59f5 | 1482 | return 1; |
1483 | } | |
1484 | ||
0b242b12 | 1485 | int |
1486 | session_subsystem_req(Session *s) | |
1487 | { | |
1488 | unsigned int len; | |
1489 | int success = 0; | |
1490 | char *subsys = packet_get_string(&len); | |
38c295d6 | 1491 | int i; |
0b242b12 | 1492 | |
1493 | packet_done(); | |
1494 | log("subsystem request for %s", subsys); | |
1495 | ||
38c295d6 | 1496 | for (i = 0; i < options.num_subsystems; i++) { |
1497 | if(strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1498 | debug("subsystem: exec() %s", options.subsystem_command[i]); | |
1499 | do_exec_no_pty(s, options.subsystem_command[i], s->pw); | |
1500 | success = 1; | |
1501 | } | |
1502 | } | |
1503 | ||
1504 | if (!success) | |
1505 | log("subsystem request for %s failed, subsystem not found", subsys); | |
1506 | ||
0b242b12 | 1507 | xfree(subsys); |
1508 | return success; | |
1509 | } | |
1510 | ||
1511 | int | |
1512 | session_x11_req(Session *s) | |
1513 | { | |
089fbbd2 | 1514 | if (no_x11_forwarding_flag) { |
38c295d6 | 1515 | debug("X11 forwarding disabled in user configuration file."); |
1516 | return 0; | |
1517 | } | |
0b242b12 | 1518 | if (!options.x11_forwarding) { |
1519 | debug("X11 forwarding disabled in server configuration file."); | |
1520 | return 0; | |
1521 | } | |
1522 | if (xauthfile != NULL) { | |
1523 | debug("X11 fwd already started."); | |
1524 | return 0; | |
1525 | } | |
1526 | ||
1527 | debug("Received request for X11 forwarding with auth spoofing."); | |
1528 | if (s->display != NULL) | |
1529 | packet_disconnect("Protocol error: X11 display already set."); | |
1530 | ||
1531 | s->single_connection = packet_get_char(); | |
1532 | s->auth_proto = packet_get_string(NULL); | |
1533 | s->auth_data = packet_get_string(NULL); | |
1534 | s->screen = packet_get_int(); | |
1535 | packet_done(); | |
1536 | ||
1537 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
1538 | if (s->display == NULL) { | |
1539 | xfree(s->auth_proto); | |
1540 | xfree(s->auth_data); | |
1541 | return 0; | |
1542 | } | |
1543 | xauthfile = xmalloc(MAXPATHLEN); | |
1544 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
1545 | temporarily_use_uid(s->pw->pw_uid); | |
1546 | if (mkdtemp(xauthfile) == NULL) { | |
1547 | restore_uid(); | |
1548 | error("private X11 dir: mkdtemp %s failed: %s", | |
1549 | xauthfile, strerror(errno)); | |
1550 | xfree(xauthfile); | |
1551 | xauthfile = NULL; | |
1552 | xfree(s->auth_proto); | |
1553 | xfree(s->auth_data); | |
1554 | /* XXXX remove listening channels */ | |
1555 | return 0; | |
1556 | } | |
1557 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
1558 | open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); | |
1559 | restore_uid(); | |
1560 | fatal_add_cleanup(xauthfile_cleanup_proc, s); | |
1561 | return 1; | |
1562 | } | |
1563 | ||
38c295d6 | 1564 | int |
1565 | session_shell_req(Session *s) | |
1566 | { | |
1567 | /* if forced_command == NULL, the shell is execed */ | |
1568 | char *shell = forced_command; | |
1569 | packet_done(); | |
1570 | s->extended = 1; | |
1571 | if (s->ttyfd == -1) | |
1572 | do_exec_no_pty(s, shell, s->pw); | |
1573 | else | |
1574 | do_exec_pty(s, shell, s->pw); | |
1575 | return 1; | |
1576 | } | |
1577 | ||
1578 | int | |
1579 | session_exec_req(Session *s) | |
1580 | { | |
1581 | unsigned int len; | |
1582 | char *command = packet_get_string(&len); | |
1583 | packet_done(); | |
1584 | if (forced_command) { | |
1585 | xfree(command); | |
1586 | command = forced_command; | |
1587 | debug("Forced command '%.500s'", forced_command); | |
1588 | } | |
1589 | s->extended = 1; | |
1590 | if (s->ttyfd == -1) | |
1591 | do_exec_no_pty(s, command, s->pw); | |
1592 | else | |
1593 | do_exec_pty(s, command, s->pw); | |
1594 | if (forced_command == NULL) | |
1595 | xfree(command); | |
1596 | return 1; | |
1597 | } | |
1598 | ||
e78a59f5 | 1599 | void |
1600 | session_input_channel_req(int id, void *arg) | |
1601 | { | |
1602 | unsigned int len; | |
1603 | int reply; | |
1604 | int success = 0; | |
1605 | char *rtype; | |
1606 | Session *s; | |
1607 | Channel *c; | |
1608 | ||
1609 | rtype = packet_get_string(&len); | |
1610 | reply = packet_get_char(); | |
1611 | ||
1612 | s = session_by_channel(id); | |
1613 | if (s == NULL) | |
1614 | fatal("session_input_channel_req: channel %d: no session", id); | |
1615 | c = channel_lookup(id); | |
1616 | if (c == NULL) | |
1617 | fatal("session_input_channel_req: channel %d: bad channel", id); | |
1618 | ||
1619 | debug("session_input_channel_req: session %d channel %d request %s reply %d", | |
1620 | s->self, id, rtype, reply); | |
1621 | ||
1622 | /* | |
1623 | * a session is in LARVAL state until a shell | |
1624 | * or programm is executed | |
1625 | */ | |
1626 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1627 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1628 | success = session_shell_req(s); |
e78a59f5 | 1629 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1630 | success = session_exec_req(s); |
e78a59f5 | 1631 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1632 | success = session_pty_req(s); |
0b242b12 | 1633 | } else if (strcmp(rtype, "x11-req") == 0) { |
1634 | success = session_x11_req(s); | |
1635 | } else if (strcmp(rtype, "subsystem") == 0) { | |
1636 | success = session_subsystem_req(s); | |
e78a59f5 | 1637 | } |
1638 | } | |
1639 | if (strcmp(rtype, "window-change") == 0) { | |
1640 | success = session_window_change_req(s); | |
1641 | } | |
1642 | ||
1643 | if (reply) { | |
1644 | packet_start(success ? | |
1645 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1646 | packet_put_int(c->remote_id); | |
1647 | packet_send(); | |
1648 | } | |
1649 | xfree(rtype); | |
1650 | } | |
1651 | ||
1652 | void | |
1653 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1654 | { | |
1655 | if (!compat20) | |
1656 | fatal("session_set_fds: called for proto != 2.0"); | |
1657 | /* | |
1658 | * now that have a child and a pipe to the child, | |
1659 | * we can activate our channel and register the fd's | |
1660 | */ | |
1661 | if (s->chanid == -1) | |
1662 | fatal("no channel for session %d", s->self); | |
1663 | channel_set_fds(s->chanid, | |
1664 | fdout, fdin, fderr, | |
1665 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ); | |
1666 | } | |
1667 | ||
7368a6c8 | 1668 | void |
1669 | session_pty_cleanup(Session *s) | |
1670 | { | |
1671 | if (s == NULL || s->ttyfd == -1) | |
1672 | return; | |
1673 | ||
1674 | debug("session_pty_cleanup: session %i release %s", s->self, s->tty); | |
1675 | ||
1676 | /* Cancel the cleanup function. */ | |
1677 | fatal_remove_cleanup(pty_cleanup_proc, (void *)s); | |
1678 | ||
1679 | /* Record that the user has logged out. */ | |
1680 | record_logout(s->pid, s->tty); | |
1681 | ||
1682 | /* Release the pseudo-tty. */ | |
1683 | pty_release(s->tty); | |
1684 | ||
1685 | /* | |
1686 | * Close the server side of the socket pairs. We must do this after | |
1687 | * the pty cleanup, so that another process doesn't get this pty | |
1688 | * while we're still cleaning up. | |
1689 | */ | |
1690 | if (close(s->ptymaster) < 0) | |
1691 | error("close(s->ptymaster): %s", strerror(errno)); | |
1692 | } | |
e78a59f5 | 1693 | |
1694 | void | |
1695 | session_exit_message(Session *s, int status) | |
1696 | { | |
1697 | Channel *c; | |
1698 | if (s == NULL) | |
1699 | fatal("session_close: no session"); | |
1700 | c = channel_lookup(s->chanid); | |
1701 | if (c == NULL) | |
1702 | fatal("session_close: session %d: no channel %d", | |
1703 | s->self, s->chanid); | |
1704 | debug("session_exit_message: session %d channel %d pid %d", | |
1705 | s->self, s->chanid, s->pid); | |
1706 | ||
1707 | if (WIFEXITED(status)) { | |
1708 | channel_request_start(s->chanid, | |
1709 | "exit-status", 0); | |
1710 | packet_put_int(WEXITSTATUS(status)); | |
1711 | packet_send(); | |
1712 | } else if (WIFSIGNALED(status)) { | |
1713 | channel_request_start(s->chanid, | |
1714 | "exit-signal", 0); | |
1715 | packet_put_int(WTERMSIG(status)); | |
a64009ad | 1716 | #ifdef WCOREDUMP |
e78a59f5 | 1717 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1718 | #else /* WCOREDUMP */ |
1719 | packet_put_char(0); | |
1720 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1721 | packet_put_cstring(""); |
1722 | packet_put_cstring(""); | |
1723 | packet_send(); | |
1724 | } else { | |
1725 | /* Some weird exit cause. Just exit. */ | |
1726 | packet_disconnect("wait returned status %04x.", status); | |
1727 | } | |
1728 | ||
1729 | /* disconnect channel */ | |
1730 | debug("session_exit_message: release channel %d", s->chanid); | |
1731 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1732 | /* |
1733 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1734 | * interested in data we write. | |
1735 | * Note that we must not call 'chan_read_failed', since there could | |
1736 | * be some more data waiting in the pipe. | |
1737 | */ | |
0b242b12 | 1738 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1739 | chan_write_failed(c); | |
e78a59f5 | 1740 | s->chanid = -1; |
1741 | } | |
1742 | ||
1743 | void | |
1744 | session_free(Session *s) | |
1745 | { | |
1746 | debug("session_free: session %d pid %d", s->self, s->pid); | |
1747 | if (s->term) | |
1748 | xfree(s->term); | |
1749 | if (s->display) | |
1750 | xfree(s->display); | |
1751 | if (s->auth_data) | |
1752 | xfree(s->auth_data); | |
1753 | if (s->auth_proto) | |
1754 | xfree(s->auth_proto); | |
1755 | s->used = 0; | |
1756 | } | |
1757 | ||
1758 | void | |
1759 | session_close(Session *s) | |
1760 | { | |
1761 | session_pty_cleanup(s); | |
1762 | session_free(s); | |
1d1ffb87 | 1763 | session_proctitle(s); |
e78a59f5 | 1764 | } |
1765 | ||
1766 | void | |
1767 | session_close_by_pid(pid_t pid, int status) | |
1768 | { | |
1769 | Session *s = session_by_pid(pid); | |
1770 | if (s == NULL) { | |
1771 | debug("session_close_by_pid: no session for pid %d", s->pid); | |
1772 | return; | |
1773 | } | |
1774 | if (s->chanid != -1) | |
1775 | session_exit_message(s, status); | |
1776 | session_close(s); | |
1777 | } | |
1778 | ||
1779 | /* | |
1780 | * this is called when a channel dies before | |
1781 | * the session 'child' itself dies | |
1782 | */ | |
1783 | void | |
1784 | session_close_by_channel(int id, void *arg) | |
1785 | { | |
1786 | Session *s = session_by_channel(id); | |
1787 | if (s == NULL) { | |
1788 | debug("session_close_by_channel: no session for channel %d", id); | |
1789 | return; | |
1790 | } | |
1791 | /* disconnect channel */ | |
1792 | channel_cancel_cleanup(s->chanid); | |
1793 | s->chanid = -1; | |
1794 | ||
1795 | debug("session_close_by_channel: channel %d kill %d", id, s->pid); | |
1796 | if (s->pid == 0) { | |
1797 | /* close session immediately */ | |
1798 | session_close(s); | |
1799 | } else { | |
1800 | /* notify child, delay session cleanup */ | |
f528fdf2 | 1801 | if (s->pid <= 1) |
512ad3c0 | 1802 | fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid); |
1803 | if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0) | |
e78a59f5 | 1804 | error("session_close_by_channel: kill %d: %s", |
1805 | s->pid, strerror(errno)); | |
1806 | } | |
1807 | } | |
1808 | ||
1d1ffb87 | 1809 | char * |
1810 | session_tty_list(void) | |
1811 | { | |
1812 | static char buf[1024]; | |
1813 | int i; | |
1814 | buf[0] = '\0'; | |
1815 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1816 | Session *s = &sessions[i]; | |
1817 | if (s->used && s->ttyfd != -1) { | |
1818 | if (buf[0] != '\0') | |
1819 | strlcat(buf, ",", sizeof buf); | |
1820 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1821 | } | |
1822 | } | |
1823 | if (buf[0] == '\0') | |
1824 | strlcpy(buf, "notty", sizeof buf); | |
1825 | return buf; | |
1826 | } | |
1827 | ||
1828 | void | |
1829 | session_proctitle(Session *s) | |
1830 | { | |
1831 | if (s->pw == NULL) | |
1832 | error("no user for session %d", s->self); | |
1833 | else | |
1834 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
1835 | } | |
1836 | ||
e78a59f5 | 1837 | void |
1838 | do_authenticated2(void) | |
1839 | { | |
0b65b628 | 1840 | #ifdef HAVE_LOGIN_CAP |
2e73a022 | 1841 | struct passwd *pw; |
0b65b628 | 1842 | #endif |
2e73a022 | 1843 | |
e78a59f5 | 1844 | /* |
1845 | * Cancel the alarm we set to limit the time taken for | |
1846 | * authentication. | |
1847 | */ | |
1848 | alarm(0); | |
3f7a7e4a | 1849 | if (startup_pipe != -1) { |
5540ea9b | 1850 | close(startup_pipe); |
3f7a7e4a | 1851 | startup_pipe = -1; |
1852 | } | |
2e73a022 | 1853 | #ifdef HAVE_LOGIN_CAP |
1854 | pw = auth_get_user(); | |
1855 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
1856 | error("unable to get login class"); | |
1857 | return; | |
1858 | } | |
1859 | #endif | |
e78a59f5 | 1860 | server_loop2(); |
34bce9a5 | 1861 | if (xauthfile) |
1862 | xauthfile_cleanup_proc(NULL); | |
e78a59f5 | 1863 | } |