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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" | |
b5e300c2 | 11 | RCSID("$OpenBSD: session.c,v 1.35 2000/09/04 19:07:21 markus 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 | ||
3c62e7eb | 44 | #ifdef HAVE_CYGWIN |
45 | #include <windows.h> | |
46 | #include <sys/cygwin.h> | |
47 | #define is_winnt (GetVersion() < 0x80000000) | |
48 | #endif | |
49 | ||
3fcce26c | 50 | /* AIX limits */ |
51 | #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE) | |
2a2cb9e7 | 52 | # define S_UFSIZE_HARD S_UFSIZE "_hard" |
53 | # define S_UCPU_HARD S_UCPU "_hard" | |
54 | # define S_UDATA_HARD S_UDATA "_hard" | |
55 | # define S_USTACK_HARD S_USTACK "_hard" | |
56 | # define S_URSS_HARD S_URSS "_hard" | |
57 | # define S_UCORE_HARD S_UCORE "_hard" | |
58 | # define S_UNOFILE_HARD S_UNOFILE "_hard" | |
3fcce26c | 59 | #endif |
60 | ||
2e73a022 | 61 | #ifdef HAVE_LOGIN_CAP |
62 | #include <login_cap.h> | |
63 | #endif | |
64 | ||
7368a6c8 | 65 | /* types */ |
66 | ||
67 | #define TTYSZ 64 | |
68 | typedef struct Session Session; | |
69 | struct Session { | |
70 | int used; | |
71 | int self; | |
0b242b12 | 72 | int extended; |
7368a6c8 | 73 | struct passwd *pw; |
74 | pid_t pid; | |
75 | /* tty */ | |
76 | char *term; | |
77 | int ptyfd, ttyfd, ptymaster; | |
78 | int row, col, xpixel, ypixel; | |
79 | char tty[TTYSZ]; | |
80 | /* X11 */ | |
81 | char *display; | |
82 | int screen; | |
83 | char *auth_proto; | |
84 | char *auth_data; | |
0b242b12 | 85 | int single_connection; |
7368a6c8 | 86 | /* proto 2 */ |
87 | int chanid; | |
88 | }; | |
89 | ||
90 | /* func */ | |
91 | ||
92 | Session *session_new(void); | |
93 | void session_set_fds(Session *s, int fdin, int fdout, int fderr); | |
94 | void session_pty_cleanup(Session *s); | |
1d1ffb87 | 95 | void session_proctitle(Session *s); |
7368a6c8 | 96 | void do_exec_pty(Session *s, const char *command, struct passwd * pw); |
97 | void do_exec_no_pty(Session *s, const char *command, struct passwd * pw); | |
c345cf9d | 98 | void do_login(Session *s); |
7368a6c8 | 99 | |
100 | void | |
101 | do_child(const char *command, struct passwd * pw, const char *term, | |
102 | const char *display, const char *auth_proto, | |
103 | const char *auth_data, const char *ttyname); | |
104 | ||
105 | /* import */ | |
106 | extern ServerOptions options; | |
3a6cb538 | 107 | #ifdef HAVE___PROGNAME |
7368a6c8 | 108 | extern char *__progname; |
3a6cb538 | 109 | #else /* HAVE___PROGNAME */ |
3fd95d9a | 110 | static const char *__progname = "sshd"; |
3a6cb538 | 111 | #endif /* HAVE___PROGNAME */ |
112 | ||
7368a6c8 | 113 | extern int log_stderr; |
114 | extern int debug_flag; | |
c345cf9d | 115 | extern unsigned int utmp_len; |
7368a6c8 | 116 | |
089fbbd2 | 117 | extern int startup_pipe; |
118 | ||
7368a6c8 | 119 | /* Local Xauthority file. */ |
120 | static char *xauthfile; | |
121 | ||
b5e300c2 | 122 | /* original command from peer. */ |
123 | char *original_command = NULL; | |
124 | ||
7368a6c8 | 125 | /* data */ |
126 | #define MAX_SESSIONS 10 | |
127 | Session sessions[MAX_SESSIONS]; | |
c1ef8333 | 128 | #ifdef WITH_AIXAUTHENTICATE |
129 | /* AIX's lastlogin message, set in auth1.c */ | |
130 | char *aixloginmsg; | |
131 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 132 | |
2e73a022 | 133 | #ifdef HAVE_LOGIN_CAP |
134 | static login_cap_t *lc; | |
135 | #endif | |
136 | ||
7368a6c8 | 137 | /* |
138 | * Remove local Xauthority file. | |
139 | */ | |
140 | void | |
141 | xauthfile_cleanup_proc(void *ignore) | |
142 | { | |
143 | debug("xauthfile_cleanup_proc called"); | |
144 | ||
145 | if (xauthfile != NULL) { | |
146 | char *p; | |
147 | unlink(xauthfile); | |
148 | p = strrchr(xauthfile, '/'); | |
149 | if (p != NULL) { | |
150 | *p = '\0'; | |
151 | rmdir(xauthfile); | |
152 | } | |
153 | xfree(xauthfile); | |
154 | xauthfile = NULL; | |
155 | } | |
156 | } | |
157 | ||
158 | /* | |
159 | * Function to perform cleanup if we get aborted abnormally (e.g., due to a | |
160 | * dropped connection). | |
161 | */ | |
6ae2364d | 162 | void |
7368a6c8 | 163 | pty_cleanup_proc(void *session) |
164 | { | |
165 | Session *s=session; | |
166 | if (s == NULL) | |
167 | fatal("pty_cleanup_proc: no session"); | |
168 | debug("pty_cleanup_proc: %s", s->tty); | |
169 | ||
170 | if (s->pid != 0) { | |
171 | /* Record that the user has logged out. */ | |
172 | record_logout(s->pid, s->tty); | |
173 | } | |
174 | ||
175 | /* Release the pseudo-tty. */ | |
176 | pty_release(s->tty); | |
177 | } | |
178 | ||
179 | /* | |
180 | * Prepares for an interactive session. This is called after the user has | |
181 | * been successfully authenticated. During this message exchange, pseudo | |
182 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
183 | * are requested, etc. | |
184 | */ | |
6ae2364d | 185 | void |
7368a6c8 | 186 | do_authenticated(struct passwd * pw) |
187 | { | |
188 | Session *s; | |
b5e300c2 | 189 | int type, fd; |
7368a6c8 | 190 | int compression_level = 0, enable_compression_after_reply = 0; |
191 | int have_pty = 0; | |
192 | char *command; | |
193 | int n_bytes; | |
194 | int plen; | |
195 | unsigned int proto_len, data_len, dlen; | |
196 | ||
197 | /* | |
198 | * Cancel the alarm we set to limit the time taken for | |
199 | * authentication. | |
200 | */ | |
201 | alarm(0); | |
3f7a7e4a | 202 | if (startup_pipe != -1) { |
5540ea9b | 203 | close(startup_pipe); |
3f7a7e4a | 204 | startup_pipe = -1; |
205 | } | |
7368a6c8 | 206 | |
207 | /* | |
208 | * Inform the channel mechanism that we are the server side and that | |
209 | * the client may request to connect to any port at all. (The user | |
210 | * could do it anyway, and we wouldn\'t know what is permitted except | |
211 | * by the client telling us, so we can equally well trust the client | |
212 | * not to request anything bogus.) | |
213 | */ | |
214 | if (!no_port_forwarding_flag) | |
215 | channel_permit_all_opens(); | |
216 | ||
217 | s = session_new(); | |
0b242b12 | 218 | s->pw = pw; |
7368a6c8 | 219 | |
2e73a022 | 220 | #ifdef HAVE_LOGIN_CAP |
221 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
222 | error("unable to get login class"); | |
223 | return; | |
224 | } | |
225 | #endif | |
226 | ||
7368a6c8 | 227 | /* |
228 | * We stay in this loop until the client requests to execute a shell | |
229 | * or a command. | |
230 | */ | |
231 | for (;;) { | |
232 | int success = 0; | |
233 | ||
234 | /* Get a packet from the client. */ | |
235 | type = packet_read(&plen); | |
236 | ||
237 | /* Process the packet. */ | |
238 | switch (type) { | |
239 | case SSH_CMSG_REQUEST_COMPRESSION: | |
240 | packet_integrity_check(plen, 4, type); | |
241 | compression_level = packet_get_int(); | |
242 | if (compression_level < 1 || compression_level > 9) { | |
243 | packet_send_debug("Received illegal compression level %d.", | |
244 | compression_level); | |
245 | break; | |
246 | } | |
247 | /* Enable compression after we have responded with SUCCESS. */ | |
248 | enable_compression_after_reply = 1; | |
249 | success = 1; | |
250 | break; | |
251 | ||
252 | case SSH_CMSG_REQUEST_PTY: | |
253 | if (no_pty_flag) { | |
254 | debug("Allocating a pty not permitted for this authentication."); | |
255 | break; | |
256 | } | |
257 | if (have_pty) | |
258 | packet_disconnect("Protocol error: you already have a pty."); | |
259 | ||
260 | debug("Allocating pty."); | |
261 | ||
262 | /* Allocate a pty and open it. */ | |
263 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, | |
264 | sizeof(s->tty))) { | |
265 | error("Failed to allocate pty."); | |
266 | break; | |
267 | } | |
268 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
269 | pty_setowner(pw, s->tty); | |
270 | ||
271 | /* Get TERM from the packet. Note that the value may be of arbitrary length. */ | |
272 | s->term = packet_get_string(&dlen); | |
273 | packet_integrity_check(dlen, strlen(s->term), type); | |
274 | /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */ | |
275 | /* Remaining bytes */ | |
276 | n_bytes = plen - (4 + dlen + 4 * 4); | |
277 | ||
278 | if (strcmp(s->term, "") == 0) { | |
279 | xfree(s->term); | |
280 | s->term = NULL; | |
281 | } | |
282 | /* Get window size from the packet. */ | |
283 | s->row = packet_get_int(); | |
284 | s->col = packet_get_int(); | |
285 | s->xpixel = packet_get_int(); | |
286 | s->ypixel = packet_get_int(); | |
287 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
288 | ||
289 | /* Get tty modes from the packet. */ | |
290 | tty_parse_modes(s->ttyfd, &n_bytes); | |
291 | packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type); | |
292 | ||
1d1ffb87 | 293 | session_proctitle(s); |
294 | ||
7368a6c8 | 295 | /* Indicate that we now have a pty. */ |
296 | success = 1; | |
297 | have_pty = 1; | |
298 | break; | |
299 | ||
300 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
301 | if (!options.x11_forwarding) { | |
302 | packet_send_debug("X11 forwarding disabled in server configuration file."); | |
303 | break; | |
304 | } | |
6fc1e9f3 | 305 | if (!options.xauth_location) { |
306 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
307 | break; | |
308 | } | |
7368a6c8 | 309 | if (no_x11_forwarding_flag) { |
310 | packet_send_debug("X11 forwarding not permitted for this authentication."); | |
311 | break; | |
312 | } | |
313 | debug("Received request for X11 forwarding with auth spoofing."); | |
314 | if (s->display != NULL) | |
315 | packet_disconnect("Protocol error: X11 display already set."); | |
316 | ||
317 | s->auth_proto = packet_get_string(&proto_len); | |
318 | s->auth_data = packet_get_string(&data_len); | |
319 | packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type); | |
320 | ||
321 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER) | |
322 | s->screen = packet_get_int(); | |
323 | else | |
324 | s->screen = 0; | |
325 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
326 | ||
327 | if (s->display == NULL) | |
328 | break; | |
329 | ||
330 | /* Setup to always have a local .Xauthority. */ | |
331 | xauthfile = xmalloc(MAXPATHLEN); | |
332 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
333 | temporarily_use_uid(pw->pw_uid); | |
334 | if (mkdtemp(xauthfile) == NULL) { | |
335 | restore_uid(); | |
336 | error("private X11 dir: mkdtemp %s failed: %s", | |
337 | xauthfile, strerror(errno)); | |
338 | xfree(xauthfile); | |
339 | xauthfile = NULL; | |
0b242b12 | 340 | /* XXXX remove listening channels */ |
7368a6c8 | 341 | break; |
342 | } | |
343 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 344 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
345 | if (fd >= 0) | |
346 | close(fd); | |
7368a6c8 | 347 | restore_uid(); |
348 | fatal_add_cleanup(xauthfile_cleanup_proc, NULL); | |
349 | success = 1; | |
350 | break; | |
7368a6c8 | 351 | |
352 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
353 | if (no_agent_forwarding_flag || compat13) { | |
354 | debug("Authentication agent forwarding not permitted for this authentication."); | |
355 | break; | |
356 | } | |
357 | debug("Received authentication agent forwarding request."); | |
6fc1e9f3 | 358 | success = auth_input_request_forwarding(pw); |
7368a6c8 | 359 | break; |
360 | ||
361 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
362 | if (no_port_forwarding_flag) { | |
363 | debug("Port forwarding not permitted for this authentication."); | |
364 | break; | |
365 | } | |
366 | debug("Received TCP/IP port forwarding request."); | |
1d1ffb87 | 367 | channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 368 | success = 1; |
369 | break; | |
370 | ||
371 | case SSH_CMSG_MAX_PACKET_SIZE: | |
372 | if (packet_set_maxsize(packet_get_int()) > 0) | |
373 | success = 1; | |
374 | break; | |
375 | ||
376 | case SSH_CMSG_EXEC_SHELL: | |
377 | case SSH_CMSG_EXEC_CMD: | |
378 | /* Set interactive/non-interactive mode. */ | |
379 | packet_set_interactive(have_pty || s->display != NULL, | |
380 | options.keepalives); | |
381 | ||
382 | if (type == SSH_CMSG_EXEC_CMD) { | |
383 | command = packet_get_string(&dlen); | |
384 | debug("Exec command '%.500s'", command); | |
385 | packet_integrity_check(plen, 4 + dlen, type); | |
386 | } else { | |
387 | command = NULL; | |
388 | packet_integrity_check(plen, 0, type); | |
389 | } | |
390 | if (forced_command != NULL) { | |
b5e300c2 | 391 | original_command = command; |
7368a6c8 | 392 | command = forced_command; |
393 | debug("Forced command '%.500s'", forced_command); | |
394 | } | |
395 | if (have_pty) | |
396 | do_exec_pty(s, command, pw); | |
397 | else | |
398 | do_exec_no_pty(s, command, pw); | |
399 | ||
400 | if (command != NULL) | |
401 | xfree(command); | |
402 | /* Cleanup user's local Xauthority file. */ | |
403 | if (xauthfile) | |
404 | xauthfile_cleanup_proc(NULL); | |
405 | return; | |
406 | ||
407 | default: | |
408 | /* | |
409 | * Any unknown messages in this phase are ignored, | |
410 | * and a failure message is returned. | |
411 | */ | |
412 | log("Unknown packet type received after authentication: %d", type); | |
413 | } | |
414 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
415 | packet_send(); | |
416 | packet_write_wait(); | |
417 | ||
418 | /* Enable compression now that we have replied if appropriate. */ | |
419 | if (enable_compression_after_reply) { | |
420 | enable_compression_after_reply = 0; | |
421 | packet_start_compression(compression_level); | |
422 | } | |
423 | } | |
424 | } | |
425 | ||
426 | /* | |
427 | * This is called to fork and execute a command when we have no tty. This | |
428 | * will call do_child from the child, and server_loop from the parent after | |
429 | * setting up file descriptors and such. | |
430 | */ | |
6ae2364d | 431 | void |
7368a6c8 | 432 | do_exec_no_pty(Session *s, const char *command, struct passwd * pw) |
433 | { | |
434 | int pid; | |
435 | ||
436 | #ifdef USE_PIPES | |
437 | int pin[2], pout[2], perr[2]; | |
438 | /* Allocate pipes for communicating with the program. */ | |
439 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
440 | packet_disconnect("Could not create pipes: %.100s", | |
441 | strerror(errno)); | |
442 | #else /* USE_PIPES */ | |
443 | int inout[2], err[2]; | |
444 | /* Uses socket pairs to communicate with the program. */ | |
445 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
446 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
447 | packet_disconnect("Could not create socket pairs: %.100s", | |
448 | strerror(errno)); | |
449 | #endif /* USE_PIPES */ | |
450 | if (s == NULL) | |
451 | fatal("do_exec_no_pty: no session"); | |
452 | ||
1d1ffb87 | 453 | session_proctitle(s); |
7368a6c8 | 454 | |
455 | #ifdef USE_PAM | |
456 | do_pam_setcred(); | |
457 | #endif /* USE_PAM */ | |
458 | ||
459 | /* Fork the child. */ | |
460 | if ((pid = fork()) == 0) { | |
461 | /* Child. Reinitialize the log since the pid has changed. */ | |
462 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
463 | ||
464 | /* | |
465 | * Create a new session and process group since the 4.4BSD | |
466 | * setlogin() affects the entire process group. | |
467 | */ | |
468 | if (setsid() < 0) | |
469 | error("setsid failed: %.100s", strerror(errno)); | |
470 | ||
471 | #ifdef USE_PIPES | |
472 | /* | |
473 | * Redirect stdin. We close the parent side of the socket | |
474 | * pair, and make the child side the standard input. | |
475 | */ | |
476 | close(pin[1]); | |
477 | if (dup2(pin[0], 0) < 0) | |
478 | perror("dup2 stdin"); | |
479 | close(pin[0]); | |
480 | ||
481 | /* Redirect stdout. */ | |
482 | close(pout[0]); | |
483 | if (dup2(pout[1], 1) < 0) | |
484 | perror("dup2 stdout"); | |
485 | close(pout[1]); | |
486 | ||
487 | /* Redirect stderr. */ | |
488 | close(perr[0]); | |
489 | if (dup2(perr[1], 2) < 0) | |
490 | perror("dup2 stderr"); | |
491 | close(perr[1]); | |
492 | #else /* USE_PIPES */ | |
493 | /* | |
494 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
495 | * use the same socket, as some programs (particularly rdist) | |
496 | * seem to depend on it. | |
497 | */ | |
498 | close(inout[1]); | |
499 | close(err[1]); | |
500 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
501 | perror("dup2 stdin"); | |
502 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
503 | perror("dup2 stdout"); | |
504 | if (dup2(err[0], 2) < 0) /* stderr */ | |
505 | perror("dup2 stderr"); | |
506 | #endif /* USE_PIPES */ | |
507 | ||
508 | /* Do processing for the child (exec command etc). */ | |
509 | do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL); | |
510 | /* NOTREACHED */ | |
511 | } | |
3c62e7eb | 512 | #ifdef HAVE_CYGWIN |
513 | if (is_winnt) | |
514 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
515 | #endif | |
7368a6c8 | 516 | if (pid < 0) |
517 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
518 | s->pid = pid; | |
519 | #ifdef USE_PIPES | |
520 | /* We are the parent. Close the child sides of the pipes. */ | |
521 | close(pin[0]); | |
522 | close(pout[1]); | |
523 | close(perr[1]); | |
524 | ||
e78a59f5 | 525 | if (compat20) { |
0b242b12 | 526 | session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1); |
e78a59f5 | 527 | } else { |
528 | /* Enter the interactive session. */ | |
529 | server_loop(pid, pin[1], pout[0], perr[0]); | |
530 | /* server_loop has closed pin[1], pout[1], and perr[1]. */ | |
531 | } | |
7368a6c8 | 532 | #else /* USE_PIPES */ |
533 | /* We are the parent. Close the child sides of the socket pairs. */ | |
534 | close(inout[0]); | |
535 | close(err[0]); | |
536 | ||
537 | /* | |
538 | * Enter the interactive session. Note: server_loop must be able to | |
539 | * handle the case that fdin and fdout are the same. | |
540 | */ | |
e78a59f5 | 541 | if (compat20) { |
0b242b12 | 542 | session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1); |
e78a59f5 | 543 | } else { |
544 | server_loop(pid, inout[1], inout[1], err[1]); | |
545 | /* server_loop has closed inout[1] and err[1]. */ | |
546 | } | |
7368a6c8 | 547 | #endif /* USE_PIPES */ |
548 | } | |
549 | ||
550 | /* | |
551 | * This is called to fork and execute a command when we have a tty. This | |
552 | * will call do_child from the child, and server_loop from the parent after | |
553 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
554 | * lastlog, and other such operations. | |
555 | */ | |
6ae2364d | 556 | void |
7368a6c8 | 557 | do_exec_pty(Session *s, const char *command, struct passwd * pw) |
558 | { | |
7368a6c8 | 559 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 560 | pid_t pid; |
7368a6c8 | 561 | |
562 | if (s == NULL) | |
563 | fatal("do_exec_pty: no session"); | |
564 | ptyfd = s->ptyfd; | |
565 | ttyfd = s->ttyfd; | |
566 | ||
7368a6c8 | 567 | #ifdef USE_PAM |
568 | do_pam_session(pw->pw_name, s->tty); | |
569 | do_pam_setcred(); | |
570 | #endif /* USE_PAM */ | |
571 | ||
572 | /* Fork the child. */ | |
573 | if ((pid = fork()) == 0) { | |
c345cf9d | 574 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 575 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
576 | ||
577 | /* Close the master side of the pseudo tty. */ | |
578 | close(ptyfd); | |
579 | ||
580 | /* Make the pseudo tty our controlling tty. */ | |
581 | pty_make_controlling_tty(&ttyfd, s->tty); | |
582 | ||
583 | /* Redirect stdin from the pseudo tty. */ | |
584 | if (dup2(ttyfd, fileno(stdin)) < 0) | |
585 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
586 | ||
587 | /* Redirect stdout to the pseudo tty. */ | |
588 | if (dup2(ttyfd, fileno(stdout)) < 0) | |
589 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
590 | ||
591 | /* Redirect stderr to the pseudo tty. */ | |
592 | if (dup2(ttyfd, fileno(stderr)) < 0) | |
593 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
594 | ||
595 | /* Close the extra descriptor for the pseudo tty. */ | |
596 | close(ttyfd); | |
597 | ||
c345cf9d | 598 | /* record login, etc. similar to login(1) */ |
599 | if (command == NULL && !options.use_login) | |
600 | do_login(s); | |
7368a6c8 | 601 | |
7368a6c8 | 602 | /* Do common processing for the child, such as execing the command. */ |
71276795 | 603 | do_child(command, pw, s->term, s->display, s->auth_proto, |
604 | s->auth_data, s->tty); | |
7368a6c8 | 605 | /* NOTREACHED */ |
606 | } | |
3c62e7eb | 607 | #ifdef HAVE_CYGWIN |
608 | if (is_winnt) | |
609 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
610 | #endif | |
7368a6c8 | 611 | if (pid < 0) |
612 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
613 | s->pid = pid; | |
614 | ||
615 | /* Parent. Close the slave side of the pseudo tty. */ | |
616 | close(ttyfd); | |
617 | ||
618 | /* | |
619 | * Create another descriptor of the pty master side for use as the | |
620 | * standard input. We could use the original descriptor, but this | |
621 | * simplifies code in server_loop. The descriptor is bidirectional. | |
622 | */ | |
623 | fdout = dup(ptyfd); | |
624 | if (fdout < 0) | |
625 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
626 | ||
627 | /* we keep a reference to the pty master */ | |
628 | ptymaster = dup(ptyfd); | |
629 | if (ptymaster < 0) | |
630 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
631 | s->ptymaster = ptymaster; | |
632 | ||
633 | /* Enter interactive session. */ | |
e78a59f5 | 634 | if (compat20) { |
635 | session_set_fds(s, ptyfd, fdout, -1); | |
636 | } else { | |
637 | server_loop(pid, ptyfd, fdout, -1); | |
638 | /* server_loop _has_ closed ptyfd and fdout. */ | |
639 | session_pty_cleanup(s); | |
640 | } | |
7368a6c8 | 641 | } |
642 | ||
c345cf9d | 643 | const char * |
644 | get_remote_name_or_ip(void) | |
645 | { | |
646 | static const char *remote = ""; | |
647 | if (utmp_len > 0) | |
648 | remote = get_canonical_hostname(); | |
649 | if (utmp_len == 0 || strlen(remote) > utmp_len) | |
650 | remote = get_remote_ipaddr(); | |
651 | return remote; | |
652 | } | |
653 | ||
654 | /* administrative, login(1)-like work */ | |
655 | void | |
656 | do_login(Session *s) | |
657 | { | |
658 | FILE *f; | |
659 | char *time_string; | |
660 | char buf[256]; | |
b5e300c2 | 661 | char hostname[MAXHOSTNAMELEN]; |
c345cf9d | 662 | socklen_t fromlen; |
663 | struct sockaddr_storage from; | |
664 | struct stat st; | |
665 | time_t last_login_time; | |
666 | struct passwd * pw = s->pw; | |
667 | pid_t pid = getpid(); | |
668 | ||
669 | /* | |
670 | * Get IP address of client. If the connection is not a socket, let | |
671 | * the address be 0.0.0.0. | |
672 | */ | |
673 | memset(&from, 0, sizeof(from)); | |
674 | if (packet_connection_is_on_socket()) { | |
675 | fromlen = sizeof(from); | |
676 | if (getpeername(packet_get_connection_in(), | |
677 | (struct sockaddr *) & from, &fromlen) < 0) { | |
678 | debug("getpeername: %.100s", strerror(errno)); | |
679 | fatal_cleanup(); | |
680 | } | |
681 | } | |
682 | ||
b5e300c2 | 683 | /* Get the time and hostname when the user last logged in. */ |
684 | last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name, | |
685 | hostname, sizeof(hostname)); | |
686 | ||
c345cf9d | 687 | /* Record that there was a login on that tty from the remote host. */ |
688 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
689 | get_remote_name_or_ip(), (struct sockaddr *)&from); | |
690 | ||
691 | /* Done if .hushlogin exists. */ | |
692 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
2e73a022 | 693 | #ifdef HAVE_LOGIN_CAP |
694 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
695 | #else | |
c345cf9d | 696 | if (stat(buf, &st) >= 0) |
2e73a022 | 697 | #endif |
c345cf9d | 698 | return; |
699 | ||
700 | #ifdef USE_PAM | |
701 | print_pam_messages(); | |
702 | #endif /* USE_PAM */ | |
703 | #ifdef WITH_AIXAUTHENTICATE | |
704 | if (aixloginmsg && *aixloginmsg) | |
705 | printf("%s\n", aixloginmsg); | |
706 | #endif /* WITH_AIXAUTHENTICATE */ | |
707 | ||
c345cf9d | 708 | if (last_login_time != 0) { |
709 | time_string = ctime(&last_login_time); | |
710 | if (strchr(time_string, '\n')) | |
711 | *strchr(time_string, '\n') = 0; | |
712 | if (strcmp(buf, "") == 0) | |
713 | printf("Last login: %s\r\n", time_string); | |
714 | else | |
715 | printf("Last login: %s from %s\r\n", time_string, buf); | |
716 | } | |
717 | if (options.print_motd) { | |
2e73a022 | 718 | #ifdef HAVE_LOGIN_CAP |
719 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
720 | "/etc/motd"), "r"); | |
721 | #else | |
c345cf9d | 722 | f = fopen("/etc/motd", "r"); |
2e73a022 | 723 | #endif |
c345cf9d | 724 | if (f) { |
725 | while (fgets(buf, sizeof(buf), f)) | |
726 | fputs(buf, stdout); | |
727 | fclose(f); | |
728 | } | |
729 | } | |
730 | } | |
731 | ||
7368a6c8 | 732 | /* |
733 | * Sets the value of the given variable in the environment. If the variable | |
734 | * already exists, its value is overriden. | |
735 | */ | |
6ae2364d | 736 | void |
7368a6c8 | 737 | child_set_env(char ***envp, unsigned int *envsizep, const char *name, |
738 | const char *value) | |
739 | { | |
740 | unsigned int i, namelen; | |
741 | char **env; | |
742 | ||
743 | /* | |
744 | * Find the slot where the value should be stored. If the variable | |
745 | * already exists, we reuse the slot; otherwise we append a new slot | |
746 | * at the end of the array, expanding if necessary. | |
747 | */ | |
748 | env = *envp; | |
749 | namelen = strlen(name); | |
750 | for (i = 0; env[i]; i++) | |
751 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
752 | break; | |
753 | if (env[i]) { | |
754 | /* Reuse the slot. */ | |
755 | xfree(env[i]); | |
756 | } else { | |
757 | /* New variable. Expand if necessary. */ | |
758 | if (i >= (*envsizep) - 1) { | |
759 | (*envsizep) += 50; | |
760 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
761 | } | |
762 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
763 | env[i + 1] = NULL; | |
764 | } | |
765 | ||
766 | /* Allocate space and format the variable in the appropriate slot. */ | |
767 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
768 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
769 | } | |
770 | ||
771 | /* | |
772 | * Reads environment variables from the given file and adds/overrides them | |
773 | * into the environment. If the file does not exist, this does nothing. | |
774 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
775 | * and assignments of the form name=value. No other forms are allowed. | |
776 | */ | |
6ae2364d | 777 | void |
7368a6c8 | 778 | read_environment_file(char ***env, unsigned int *envsize, |
779 | const char *filename) | |
780 | { | |
781 | FILE *f; | |
782 | char buf[4096]; | |
783 | char *cp, *value; | |
784 | ||
785 | f = fopen(filename, "r"); | |
786 | if (!f) | |
787 | return; | |
788 | ||
789 | while (fgets(buf, sizeof(buf), f)) { | |
790 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
791 | ; | |
792 | if (!*cp || *cp == '#' || *cp == '\n') | |
793 | continue; | |
794 | if (strchr(cp, '\n')) | |
795 | *strchr(cp, '\n') = '\0'; | |
796 | value = strchr(cp, '='); | |
797 | if (value == NULL) { | |
798 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
799 | continue; | |
800 | } | |
71276795 | 801 | /* |
802 | * Replace the equals sign by nul, and advance value to | |
803 | * the value string. | |
804 | */ | |
7368a6c8 | 805 | *value = '\0'; |
806 | value++; | |
807 | child_set_env(env, envsize, cp, value); | |
808 | } | |
809 | fclose(f); | |
810 | } | |
811 | ||
812 | #ifdef USE_PAM | |
813 | /* | |
814 | * Sets any environment variables which have been specified by PAM | |
815 | */ | |
816 | void do_pam_environment(char ***env, int *envsize) | |
817 | { | |
818 | char *equals, var_name[512], var_val[512]; | |
819 | char **pam_env; | |
820 | int i; | |
821 | ||
822 | if ((pam_env = fetch_pam_environment()) == NULL) | |
823 | return; | |
824 | ||
825 | for(i = 0; pam_env[i] != NULL; i++) { | |
826 | if ((equals = strstr(pam_env[i], "=")) == NULL) | |
827 | continue; | |
828 | ||
829 | if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) { | |
830 | memset(var_name, '\0', sizeof(var_name)); | |
831 | memset(var_val, '\0', sizeof(var_val)); | |
832 | ||
833 | strncpy(var_name, pam_env[i], equals - pam_env[i]); | |
834 | strcpy(var_val, equals + 1); | |
835 | ||
836 | debug("PAM environment: %s=%s", var_name, var_val); | |
837 | ||
838 | child_set_env(env, envsize, var_name, var_val); | |
839 | } | |
840 | } | |
841 | } | |
842 | #endif /* USE_PAM */ | |
843 | ||
5fa45897 | 844 | #if defined(HAVE_GETUSERATTR) |
845 | /* | |
846 | * AIX-specific login initialisation | |
847 | */ | |
848 | void set_limit(char *user, char *soft, char *hard, int resource, int mult) | |
849 | { | |
850 | struct rlimit rlim; | |
56118702 | 851 | int slim, hlim; |
5fa45897 | 852 | |
853 | getrlimit(resource, &rlim); | |
854 | ||
56118702 | 855 | slim = 0; |
856 | if (getuserattr(user, soft, &slim, SEC_INT) != -1) { | |
857 | if (slim < 0) { | |
858 | rlim.rlim_cur = RLIM_INFINITY; | |
859 | } else if (slim != 0) { | |
860 | /* See the wackiness below */ | |
861 | if (rlim.rlim_cur == slim * mult) | |
862 | slim = 0; | |
863 | else | |
864 | rlim.rlim_cur = slim * mult; | |
865 | } | |
866 | } | |
5fa45897 | 867 | |
56118702 | 868 | hlim = 0; |
869 | if (getuserattr(user, hard, &hlim, SEC_INT) != -1) { | |
870 | if (hlim < 0) { | |
871 | rlim.rlim_max = RLIM_INFINITY; | |
872 | } else if (hlim != 0) { | |
873 | rlim.rlim_max = hlim * mult; | |
874 | } | |
875 | } | |
5fa45897 | 876 | |
56118702 | 877 | /* |
878 | * XXX For cpu and fsize the soft limit is set to the hard limit | |
879 | * if the hard limit is left at its default value and the soft limit | |
880 | * is changed from its default value, either by requesting it | |
881 | * (slim == 0) or by setting it to the current default. At least | |
882 | * that's how rlogind does it. If you're confused you're not alone. | |
883 | * Bug or feature? AIX 4.3.1.2 | |
884 | */ | |
885 | if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu")) | |
886 | && hlim == 0 && slim != 0) | |
887 | rlim.rlim_max = rlim.rlim_cur; | |
888 | /* A specified hard limit limits the soft limit */ | |
889 | else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max) | |
890 | rlim.rlim_cur = rlim.rlim_max; | |
891 | /* A soft limit can increase a hard limit */ | |
892 | else if (rlim.rlim_cur > rlim.rlim_max) | |
5fa45897 | 893 | rlim.rlim_max = rlim.rlim_cur; |
894 | ||
895 | if (setrlimit(resource, &rlim) != 0) | |
56118702 | 896 | error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno)); |
5fa45897 | 897 | } |
898 | ||
899 | void set_limits_from_userattr(char *user) | |
900 | { | |
901 | int mask; | |
902 | char buf[16]; | |
903 | ||
904 | set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512); | |
905 | set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1); | |
906 | set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512); | |
907 | set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512); | |
908 | set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512); | |
909 | set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512); | |
910 | #if defined(S_UNOFILE) | |
911 | set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1); | |
912 | #endif | |
913 | ||
914 | if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) { | |
915 | /* Convert decimal to octal */ | |
916 | (void) snprintf(buf, sizeof(buf), "%d", mask); | |
917 | if (sscanf(buf, "%o", &mask) == 1) | |
918 | umask(mask); | |
919 | } | |
920 | } | |
921 | #endif /* defined(HAVE_GETUSERATTR) */ | |
922 | ||
7368a6c8 | 923 | /* |
924 | * Performs common processing for the child, such as setting up the | |
925 | * environment, closing extra file descriptors, setting the user and group | |
926 | * ids, and executing the command or shell. | |
927 | */ | |
6ae2364d | 928 | void |
7368a6c8 | 929 | do_child(const char *command, struct passwd * pw, const char *term, |
930 | const char *display, const char *auth_proto, | |
931 | const char *auth_data, const char *ttyname) | |
932 | { | |
b5e300c2 | 933 | const char *shell, *hostname = NULL, *cp = NULL; |
7368a6c8 | 934 | char buf[256]; |
6fc1e9f3 | 935 | char cmd[1024]; |
2e73a022 | 936 | FILE *f = NULL; |
7368a6c8 | 937 | unsigned int envsize, i; |
938 | char **env; | |
939 | extern char **environ; | |
940 | struct stat st; | |
941 | char *argv[10]; | |
3206bb3b | 942 | #ifdef WITH_IRIX_PROJECT |
943 | prid_t projid; | |
944 | #endif /* WITH_IRIX_PROJECT */ | |
7368a6c8 | 945 | |
fa649821 | 946 | /* login(1) is only called if we execute the login shell */ |
947 | if (options.use_login && command != NULL) | |
948 | options.use_login = 0; | |
949 | ||
7368a6c8 | 950 | #ifndef USE_PAM /* pam_nologin handles this */ |
2e73a022 | 951 | if (!options.use_login) { |
952 | # ifdef HAVE_LOGIN_CAP | |
953 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
954 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
955 | _PATH_NOLOGIN), "r"); | |
956 | # else /* HAVE_LOGIN_CAP */ | |
957 | if (pw->pw_uid) | |
958 | f = fopen(_PATH_NOLOGIN, "r"); | |
959 | # endif /* HAVE_LOGIN_CAP */ | |
960 | if (f) { | |
961 | /* /etc/nologin exists. Print its contents and exit. */ | |
962 | while (fgets(buf, sizeof(buf), f)) | |
963 | fputs(buf, stderr); | |
964 | fclose(f); | |
7368a6c8 | 965 | exit(254); |
2e73a022 | 966 | } |
7368a6c8 | 967 | } |
968 | #endif /* USE_PAM */ | |
969 | ||
2e73a022 | 970 | /* Set login name, uid, gid, and groups. */ |
7368a6c8 | 971 | /* Login(1) does this as well, and it needs uid 0 for the "-h" |
972 | switch, so we let login(1) to this for us. */ | |
973 | if (!options.use_login) { | |
4d33e531 | 974 | #ifdef HAVE_OSF_SIA |
975 | extern char **saved_argv; | |
976 | extern int saved_argc; | |
977 | char *host = get_canonical_hostname (); | |
978 | ||
979 | if (sia_become_user(NULL, saved_argc, saved_argv, host, | |
980 | pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) != | |
981 | SIASUCCESS) { | |
982 | perror("sia_become_user"); | |
983 | exit(1); | |
984 | } | |
985 | if (setreuid(geteuid(), geteuid()) < 0) { | |
986 | perror("setreuid"); | |
987 | exit(1); | |
988 | } | |
989 | #else /* HAVE_OSF_SIA */ | |
3c62e7eb | 990 | #ifdef HAVE_CYGWIN |
991 | if (is_winnt) { | |
992 | #else | |
7368a6c8 | 993 | if (getuid() == 0 || geteuid() == 0) { |
3c62e7eb | 994 | #endif |
2e73a022 | 995 | # ifdef HAVE_GETUSERATTR |
5fa45897 | 996 | set_limits_from_userattr(pw->pw_name); |
2e73a022 | 997 | # endif /* HAVE_GETUSERATTR */ |
998 | # ifdef HAVE_LOGIN_CAP | |
999 | if (setusercontext(lc, pw, pw->pw_uid, | |
1000 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1001 | perror("unable to set user context"); | |
1002 | exit(1); | |
1003 | } | |
1004 | # else /* HAVE_LOGIN_CAP */ | |
1005 | if (setlogin(pw->pw_name) < 0) | |
1006 | error("setlogin failed: %s", strerror(errno)); | |
7368a6c8 | 1007 | if (setgid(pw->pw_gid) < 0) { |
1008 | perror("setgid"); | |
1009 | exit(1); | |
1010 | } | |
1011 | /* Initialize the group list. */ | |
1012 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1013 | perror("initgroups"); | |
1014 | exit(1); | |
1015 | } | |
1016 | endgrent(); | |
2e73a022 | 1017 | # ifdef WITH_IRIX_ARRAY |
3206bb3b | 1018 | /* initialize array session */ |
1019 | if (newarraysess() != 0) | |
1020 | fatal("Failed to set up new array session: %.100s", | |
1021 | strerror(errno)); | |
2e73a022 | 1022 | # endif /* WITH_IRIX_ARRAY */ |
1023 | # ifdef WITH_IRIX_PROJECT | |
3206bb3b | 1024 | /* initialize irix project info */ |
1025 | if ((projid = getdfltprojuser(pw->pw_name)) == -1) { | |
1026 | debug("Failed to get project id, using projid 0"); | |
1027 | projid = 0; | |
1028 | } | |
3206bb3b | 1029 | if (setprid(projid)) |
1030 | fatal("Failed to initialize project %d for %s: %.100s", | |
1031 | (int)projid, pw->pw_name, strerror(errno)); | |
2e73a022 | 1032 | # endif /* WITH_IRIX_PROJECT */ |
7368a6c8 | 1033 | /* Permanently switch to the desired uid. */ |
1034 | permanently_set_uid(pw->pw_uid); | |
2e73a022 | 1035 | # endif /* HAVE_LOGIN_CAP */ |
7368a6c8 | 1036 | } |
2e73a022 | 1037 | #endif /* HAVE_OSF_SIA */ |
1038 | ||
3c62e7eb | 1039 | #ifdef HAVE_CYGWIN |
1040 | if (is_winnt) | |
1041 | #endif | |
7368a6c8 | 1042 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
14a9a859 | 1043 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
7368a6c8 | 1044 | } |
1045 | /* | |
1046 | * Get the shell from the password data. An empty shell field is | |
1047 | * legal, and means /bin/sh. | |
1048 | */ | |
1049 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
2e73a022 | 1050 | #ifdef HAVE_LOGIN_CAP |
1051 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1052 | #endif | |
7368a6c8 | 1053 | |
1054 | #ifdef AFS | |
1055 | /* Try to get AFS tokens for the local cell. */ | |
1056 | if (k_hasafs()) { | |
1057 | char cell[64]; | |
1058 | ||
1059 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1060 | krb_afslog(cell, 0); | |
1061 | ||
1062 | krb_afslog(0, 0); | |
1063 | } | |
1064 | #endif /* AFS */ | |
1065 | ||
1066 | /* Initialize the environment. */ | |
1067 | envsize = 100; | |
1068 | env = xmalloc(envsize * sizeof(char *)); | |
1069 | env[0] = NULL; | |
1070 | ||
3c62e7eb | 1071 | #ifdef HAVE_CYGWIN |
1072 | /* | |
1073 | * The Windows environment contains some setting which are | |
1074 | * important for a running system. They must not be dropped. | |
1075 | */ | |
1076 | { | |
1077 | char **ep; | |
1078 | for (ep = environ; *ep; ++ep) { | |
1079 | char *esp = strchr(*ep, '='); | |
1080 | *esp = '\0'; | |
1081 | child_set_env(&env, &envsize, *ep, esp + 1); | |
1082 | *esp = '='; | |
1083 | } | |
1084 | } | |
1085 | #endif | |
1086 | ||
7368a6c8 | 1087 | if (!options.use_login) { |
1088 | /* Set basic environment. */ | |
1089 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1090 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1091 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
2e73a022 | 1092 | #ifdef HAVE_LOGIN_CAP |
1093 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH); | |
1094 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
1095 | #else | |
3c62e7eb | 1096 | #ifndef HAVE_CYGWIN |
1097 | /* | |
1098 | * There's no standard path on Windows. The path contains | |
1099 | * important components pointing to the system directories, | |
1100 | * needed for loading shared libraries. So the path better | |
1101 | * remains intact here. | |
1102 | */ | |
7368a6c8 | 1103 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
3c62e7eb | 1104 | #endif |
2e73a022 | 1105 | #endif |
7368a6c8 | 1106 | |
1107 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1108 | _PATH_MAILDIR, pw->pw_name); | |
1109 | child_set_env(&env, &envsize, "MAIL", buf); | |
1110 | ||
1111 | /* Normal systems set SHELL by default. */ | |
1112 | child_set_env(&env, &envsize, "SHELL", shell); | |
1113 | } | |
1114 | if (getenv("TZ")) | |
1115 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1116 | ||
1117 | /* Set custom environment options from RSA authentication. */ | |
1118 | while (custom_environment) { | |
1119 | struct envstring *ce = custom_environment; | |
1120 | char *s = ce->s; | |
1121 | int i; | |
1122 | for (i = 0; s[i] != '=' && s[i]; i++); | |
1123 | if (s[i] == '=') { | |
1124 | s[i] = 0; | |
1125 | child_set_env(&env, &envsize, s, s + i + 1); | |
1126 | } | |
1127 | custom_environment = ce->next; | |
1128 | xfree(ce->s); | |
1129 | xfree(ce); | |
1130 | } | |
1131 | ||
1132 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
1133 | get_remote_ipaddr(), get_remote_port(), get_local_port()); | |
1134 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); | |
1135 | ||
1136 | if (ttyname) | |
1137 | child_set_env(&env, &envsize, "SSH_TTY", ttyname); | |
1138 | if (term) | |
1139 | child_set_env(&env, &envsize, "TERM", term); | |
1140 | if (display) | |
1141 | child_set_env(&env, &envsize, "DISPLAY", display); | |
b5e300c2 | 1142 | if (original_command) |
1143 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1144 | original_command); | |
7368a6c8 | 1145 | |
1146 | #ifdef _AIX | |
1147 | { | |
1148 | char *authstate,*krb5cc; | |
1149 | ||
1150 | if ((authstate = getenv("AUTHSTATE")) != NULL) | |
1151 | child_set_env(&env,&envsize,"AUTHSTATE",authstate); | |
1152 | ||
1153 | if ((krb5cc = getenv("KRB5CCNAME")) != NULL) | |
1154 | child_set_env(&env,&envsize,"KRB5CCNAME",krb5cc); | |
1155 | } | |
1156 | #endif | |
1157 | ||
1158 | #ifdef KRB4 | |
1159 | { | |
1160 | extern char *ticket; | |
1161 | ||
1162 | if (ticket) | |
1163 | child_set_env(&env, &envsize, "KRBTKFILE", ticket); | |
1164 | } | |
1165 | #endif /* KRB4 */ | |
1166 | ||
1167 | #ifdef USE_PAM | |
1168 | /* Pull in any environment variables that may have been set by PAM. */ | |
1169 | do_pam_environment(&env, &envsize); | |
1170 | #endif /* USE_PAM */ | |
1171 | ||
1172 | read_environment_file(&env,&envsize,"/etc/environment"); | |
1173 | ||
1174 | if (xauthfile) | |
1175 | child_set_env(&env, &envsize, "XAUTHORITY", xauthfile); | |
1176 | if (auth_get_socket_name() != NULL) | |
1177 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, | |
1178 | auth_get_socket_name()); | |
1179 | ||
1180 | /* read $HOME/.ssh/environment. */ | |
1181 | if (!options.use_login) { | |
71276795 | 1182 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1183 | pw->pw_dir); | |
7368a6c8 | 1184 | read_environment_file(&env, &envsize, buf); |
1185 | } | |
1186 | if (debug_flag) { | |
1187 | /* dump the environment */ | |
1188 | fprintf(stderr, "Environment:\n"); | |
1189 | for (i = 0; env[i]; i++) | |
1190 | fprintf(stderr, " %.200s\n", env[i]); | |
1191 | } | |
2e73a022 | 1192 | /* we have to stash the hostname before we close our socket. */ |
1193 | if (options.use_login) | |
1194 | hostname = get_remote_name_or_ip(); | |
7368a6c8 | 1195 | /* |
1196 | * Close the connection descriptors; note that this is the child, and | |
1197 | * the server will still have the socket open, and it is important | |
1198 | * that we do not shutdown it. Note that the descriptors cannot be | |
1199 | * closed before building the environment, as we call | |
1200 | * get_remote_ipaddr there. | |
1201 | */ | |
1202 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1203 | close(packet_get_connection_in()); | |
1204 | else { | |
1205 | close(packet_get_connection_in()); | |
1206 | close(packet_get_connection_out()); | |
1207 | } | |
1208 | /* | |
1209 | * Close all descriptors related to channels. They will still remain | |
1210 | * open in the parent. | |
1211 | */ | |
1212 | /* XXX better use close-on-exec? -markus */ | |
1213 | channel_close_all(); | |
1214 | ||
1215 | /* | |
1216 | * Close any extra file descriptors. Note that there may still be | |
1217 | * descriptors left by system functions. They will be closed later. | |
1218 | */ | |
1219 | endpwent(); | |
1220 | ||
1221 | /* | |
1222 | * Close any extra open file descriptors so that we don\'t have them | |
1223 | * hanging around in clients. Note that we want to do this after | |
1224 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1225 | * descriptors open. | |
1226 | */ | |
1227 | for (i = 3; i < 64; i++) | |
1228 | close(i); | |
1229 | ||
1230 | /* Change current directory to the user\'s home directory. */ | |
2e73a022 | 1231 | if (chdir(pw->pw_dir) < 0) { |
7368a6c8 | 1232 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", |
1233 | pw->pw_dir, strerror(errno)); | |
2e73a022 | 1234 | #ifdef HAVE_LOGIN_CAP |
1235 | if (login_getcapbool(lc, "requirehome", 0)) | |
1236 | exit(1); | |
1237 | #endif | |
1238 | } | |
7368a6c8 | 1239 | |
1240 | /* | |
1241 | * Must take new environment into use so that .ssh/rc, /etc/sshrc and | |
1242 | * xauth are run in the proper environment. | |
1243 | */ | |
1244 | environ = env; | |
1245 | ||
1246 | /* | |
1247 | * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first | |
1248 | * in this order). | |
1249 | */ | |
1250 | if (!options.use_login) { | |
1251 | if (stat(SSH_USER_RC, &st) >= 0) { | |
1252 | if (debug_flag) | |
30228d7c | 1253 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_USER_RC); |
7368a6c8 | 1254 | |
30228d7c | 1255 | f = popen(_PATH_BSHELL " " SSH_USER_RC, "w"); |
7368a6c8 | 1256 | if (f) { |
1257 | if (auth_proto != NULL && auth_data != NULL) | |
1258 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1259 | pclose(f); | |
1260 | } else | |
1261 | fprintf(stderr, "Could not run %s\n", SSH_USER_RC); | |
1262 | } else if (stat(SSH_SYSTEM_RC, &st) >= 0) { | |
1263 | if (debug_flag) | |
30228d7c | 1264 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_SYSTEM_RC); |
7368a6c8 | 1265 | |
30228d7c | 1266 | f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w"); |
7368a6c8 | 1267 | if (f) { |
1268 | if (auth_proto != NULL && auth_data != NULL) | |
1269 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1270 | pclose(f); | |
1271 | } else | |
1272 | fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC); | |
6fc1e9f3 | 1273 | } else if (options.xauth_location != NULL) { |
7368a6c8 | 1274 | /* Add authority data to .Xauthority if appropriate. */ |
1275 | if (auth_proto != NULL && auth_data != NULL) { | |
29611d9c | 1276 | char *screen = strchr(display, ':'); |
1277 | if (debug_flag) { | |
71276795 | 1278 | fprintf(stderr, |
1279 | "Running %.100s add %.100s %.100s %.100s\n", | |
6fc1e9f3 | 1280 | options.xauth_location, display, |
1281 | auth_proto, auth_data); | |
3c62e7eb | 1282 | #ifndef HAVE_CYGWIN |
29611d9c | 1283 | if (screen != NULL) |
71276795 | 1284 | fprintf(stderr, |
1285 | "Adding %.*s/unix%s %s %s\n", | |
14a9a859 | 1286 | (int)(screen-display), display, |
71276795 | 1287 | screen, auth_proto, auth_data); |
3c62e7eb | 1288 | #endif |
29611d9c | 1289 | } |
6fc1e9f3 | 1290 | snprintf(cmd, sizeof cmd, "%s -q -", |
1291 | options.xauth_location); | |
1292 | f = popen(cmd, "w"); | |
7368a6c8 | 1293 | if (f) { |
71276795 | 1294 | fprintf(f, "add %s %s %s\n", display, |
1295 | auth_proto, auth_data); | |
3c62e7eb | 1296 | #ifndef HAVE_CYGWIN |
29611d9c | 1297 | if (screen != NULL) |
1298 | fprintf(f, "add %.*s/unix%s %s %s\n", | |
14a9a859 | 1299 | (int)(screen-display), display, |
71276795 | 1300 | screen, auth_proto, auth_data); |
3c62e7eb | 1301 | #endif |
7368a6c8 | 1302 | pclose(f); |
6fc1e9f3 | 1303 | } else { |
1304 | fprintf(stderr, "Could not run %s\n", | |
1305 | cmd); | |
1306 | } | |
7368a6c8 | 1307 | } |
1308 | } | |
7368a6c8 | 1309 | /* Get the last component of the shell name. */ |
1310 | cp = strrchr(shell, '/'); | |
1311 | if (cp) | |
1312 | cp++; | |
1313 | else | |
1314 | cp = shell; | |
1315 | } | |
1316 | /* | |
1317 | * If we have no command, execute the shell. In this case, the shell | |
1318 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1319 | * this is a login shell. | |
1320 | */ | |
1321 | if (!command) { | |
1322 | if (!options.use_login) { | |
1323 | char buf[256]; | |
1324 | ||
1325 | /* | |
1326 | * Check for mail if we have a tty and it was enabled | |
1327 | * in server options. | |
1328 | */ | |
1329 | if (ttyname && options.check_mail) { | |
1330 | char *mailbox; | |
1331 | struct stat mailstat; | |
1332 | mailbox = getenv("MAIL"); | |
1333 | if (mailbox != NULL) { | |
71276795 | 1334 | if (stat(mailbox, &mailstat) != 0 || |
1335 | mailstat.st_size == 0) | |
7368a6c8 | 1336 | printf("No mail.\n"); |
1337 | else if (mailstat.st_mtime < mailstat.st_atime) | |
1338 | printf("You have mail.\n"); | |
1339 | else | |
1340 | printf("You have new mail.\n"); | |
1341 | } | |
1342 | } | |
1343 | /* Start the shell. Set initial character to '-'. */ | |
1344 | buf[0] = '-'; | |
1345 | strncpy(buf + 1, cp, sizeof(buf) - 1); | |
1346 | buf[sizeof(buf) - 1] = 0; | |
1347 | ||
1348 | /* Execute the shell. */ | |
1349 | argv[0] = buf; | |
1350 | argv[1] = NULL; | |
1351 | execve(shell, argv, env); | |
1352 | ||
1353 | /* Executing the shell failed. */ | |
1354 | perror(shell); | |
1355 | exit(1); | |
1356 | ||
1357 | } else { | |
1358 | /* Launch login(1). */ | |
1359 | ||
2e73a022 | 1360 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
c345cf9d | 1361 | "-p", "-f", "--", pw->pw_name, NULL); |
7368a6c8 | 1362 | |
1363 | /* Login couldn't be executed, die. */ | |
1364 | ||
1365 | perror("login"); | |
1366 | exit(1); | |
1367 | } | |
1368 | } | |
1369 | /* | |
1370 | * Execute the command using the user's shell. This uses the -c | |
1371 | * option to execute the command. | |
1372 | */ | |
1373 | argv[0] = (char *) cp; | |
1374 | argv[1] = "-c"; | |
1375 | argv[2] = (char *) command; | |
1376 | argv[3] = NULL; | |
1377 | execve(shell, argv, env); | |
1378 | perror(shell); | |
1379 | exit(1); | |
1380 | } | |
1381 | ||
1382 | Session * | |
1383 | session_new(void) | |
1384 | { | |
1385 | int i; | |
1386 | static int did_init = 0; | |
1387 | if (!did_init) { | |
1388 | debug("session_new: init"); | |
1389 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1390 | sessions[i].used = 0; | |
1391 | sessions[i].self = i; | |
1392 | } | |
1393 | did_init = 1; | |
1394 | } | |
1395 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1396 | Session *s = &sessions[i]; | |
1397 | if (! s->used) { | |
1398 | s->pid = 0; | |
0b242b12 | 1399 | s->extended = 0; |
7368a6c8 | 1400 | s->chanid = -1; |
1401 | s->ptyfd = -1; | |
1402 | s->ttyfd = -1; | |
1403 | s->term = NULL; | |
1404 | s->pw = NULL; | |
1405 | s->display = NULL; | |
1406 | s->screen = 0; | |
1407 | s->auth_data = NULL; | |
1408 | s->auth_proto = NULL; | |
1409 | s->used = 1; | |
0b242b12 | 1410 | s->pw = NULL; |
7368a6c8 | 1411 | debug("session_new: session %d", i); |
1412 | return s; | |
1413 | } | |
1414 | } | |
1415 | return NULL; | |
1416 | } | |
1417 | ||
1418 | void | |
1419 | session_dump(void) | |
1420 | { | |
1421 | int i; | |
1422 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1423 | Session *s = &sessions[i]; | |
1424 | debug("dump: used %d session %d %p channel %d pid %d", | |
1425 | s->used, | |
1426 | s->self, | |
1427 | s, | |
1428 | s->chanid, | |
1429 | s->pid); | |
1430 | } | |
1431 | } | |
1432 | ||
e78a59f5 | 1433 | int |
1434 | session_open(int chanid) | |
1435 | { | |
1436 | Session *s = session_new(); | |
1437 | debug("session_open: channel %d", chanid); | |
1438 | if (s == NULL) { | |
1439 | error("no more sessions"); | |
1440 | return 0; | |
1441 | } | |
e78a59f5 | 1442 | s->pw = auth_get_user(); |
1443 | if (s->pw == NULL) | |
0b242b12 | 1444 | fatal("no user for session %i", s->self); |
1445 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1446 | s->chanid = chanid; | |
e78a59f5 | 1447 | return 1; |
1448 | } | |
1449 | ||
1450 | Session * | |
1451 | session_by_channel(int id) | |
1452 | { | |
1453 | int i; | |
1454 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1455 | Session *s = &sessions[i]; | |
1456 | if (s->used && s->chanid == id) { | |
1457 | debug("session_by_channel: session %d channel %d", i, id); | |
1458 | return s; | |
1459 | } | |
1460 | } | |
1461 | debug("session_by_channel: unknown channel %d", id); | |
1462 | session_dump(); | |
1463 | return NULL; | |
1464 | } | |
1465 | ||
1466 | Session * | |
1467 | session_by_pid(pid_t pid) | |
1468 | { | |
1469 | int i; | |
1470 | debug("session_by_pid: pid %d", pid); | |
1471 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1472 | Session *s = &sessions[i]; | |
1473 | if (s->used && s->pid == pid) | |
1474 | return s; | |
1475 | } | |
1476 | error("session_by_pid: unknown pid %d", pid); | |
1477 | session_dump(); | |
1478 | return NULL; | |
1479 | } | |
1480 | ||
1481 | int | |
1482 | session_window_change_req(Session *s) | |
1483 | { | |
1484 | s->col = packet_get_int(); | |
1485 | s->row = packet_get_int(); | |
1486 | s->xpixel = packet_get_int(); | |
1487 | s->ypixel = packet_get_int(); | |
6ae2364d | 1488 | packet_done(); |
e78a59f5 | 1489 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1490 | return 1; | |
1491 | } | |
1492 | ||
1493 | int | |
1494 | session_pty_req(Session *s) | |
1495 | { | |
1496 | unsigned int len; | |
6ae2364d | 1497 | char *term_modes; /* encoded terminal modes */ |
e78a59f5 | 1498 | |
38c295d6 | 1499 | if (no_pty_flag) |
1500 | return 0; | |
e78a59f5 | 1501 | if (s->ttyfd != -1) |
6ae2364d | 1502 | return 0; |
e78a59f5 | 1503 | s->term = packet_get_string(&len); |
1504 | s->col = packet_get_int(); | |
1505 | s->row = packet_get_int(); | |
1506 | s->xpixel = packet_get_int(); | |
1507 | s->ypixel = packet_get_int(); | |
6ae2364d | 1508 | term_modes = packet_get_string(&len); |
1509 | packet_done(); | |
e78a59f5 | 1510 | |
1511 | if (strcmp(s->term, "") == 0) { | |
1512 | xfree(s->term); | |
1513 | s->term = NULL; | |
1514 | } | |
1515 | /* Allocate a pty and open it. */ | |
1516 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) { | |
1517 | xfree(s->term); | |
1518 | s->term = NULL; | |
1519 | s->ptyfd = -1; | |
1520 | s->ttyfd = -1; | |
1521 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1522 | xfree(term_modes); |
1523 | return 0; | |
e78a59f5 | 1524 | } |
1525 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1526 | /* | |
1527 | * Add a cleanup function to clear the utmp entry and record logout | |
1528 | * time in case we call fatal() (e.g., the connection gets closed). | |
1529 | */ | |
1530 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
1531 | pty_setowner(s->pw, s->tty); | |
1532 | /* Get window size from the packet. */ | |
1533 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1534 | ||
1d1ffb87 | 1535 | session_proctitle(s); |
1536 | ||
35484284 | 1537 | /* XXX parse and set terminal modes */ |
1538 | xfree(term_modes); | |
e78a59f5 | 1539 | return 1; |
1540 | } | |
1541 | ||
0b242b12 | 1542 | int |
1543 | session_subsystem_req(Session *s) | |
1544 | { | |
1545 | unsigned int len; | |
1546 | int success = 0; | |
1547 | char *subsys = packet_get_string(&len); | |
38c295d6 | 1548 | int i; |
0b242b12 | 1549 | |
1550 | packet_done(); | |
1551 | log("subsystem request for %s", subsys); | |
1552 | ||
38c295d6 | 1553 | for (i = 0; i < options.num_subsystems; i++) { |
1554 | if(strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1555 | debug("subsystem: exec() %s", options.subsystem_command[i]); | |
1556 | do_exec_no_pty(s, options.subsystem_command[i], s->pw); | |
1557 | success = 1; | |
1558 | } | |
1559 | } | |
1560 | ||
1561 | if (!success) | |
1562 | log("subsystem request for %s failed, subsystem not found", subsys); | |
1563 | ||
0b242b12 | 1564 | xfree(subsys); |
1565 | return success; | |
1566 | } | |
1567 | ||
1568 | int | |
1569 | session_x11_req(Session *s) | |
1570 | { | |
b5e300c2 | 1571 | int fd; |
089fbbd2 | 1572 | if (no_x11_forwarding_flag) { |
38c295d6 | 1573 | debug("X11 forwarding disabled in user configuration file."); |
1574 | return 0; | |
1575 | } | |
0b242b12 | 1576 | if (!options.x11_forwarding) { |
1577 | debug("X11 forwarding disabled in server configuration file."); | |
1578 | return 0; | |
1579 | } | |
1580 | if (xauthfile != NULL) { | |
1581 | debug("X11 fwd already started."); | |
1582 | return 0; | |
1583 | } | |
1584 | ||
1585 | debug("Received request for X11 forwarding with auth spoofing."); | |
1586 | if (s->display != NULL) | |
1587 | packet_disconnect("Protocol error: X11 display already set."); | |
1588 | ||
1589 | s->single_connection = packet_get_char(); | |
1590 | s->auth_proto = packet_get_string(NULL); | |
1591 | s->auth_data = packet_get_string(NULL); | |
1592 | s->screen = packet_get_int(); | |
1593 | packet_done(); | |
1594 | ||
1595 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
1596 | if (s->display == NULL) { | |
1597 | xfree(s->auth_proto); | |
1598 | xfree(s->auth_data); | |
1599 | return 0; | |
1600 | } | |
1601 | xauthfile = xmalloc(MAXPATHLEN); | |
1602 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
1603 | temporarily_use_uid(s->pw->pw_uid); | |
1604 | if (mkdtemp(xauthfile) == NULL) { | |
1605 | restore_uid(); | |
1606 | error("private X11 dir: mkdtemp %s failed: %s", | |
1607 | xauthfile, strerror(errno)); | |
1608 | xfree(xauthfile); | |
1609 | xauthfile = NULL; | |
1610 | xfree(s->auth_proto); | |
1611 | xfree(s->auth_data); | |
1612 | /* XXXX remove listening channels */ | |
1613 | return 0; | |
1614 | } | |
1615 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 1616 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
1617 | if (fd >= 0) | |
1618 | close(fd); | |
0b242b12 | 1619 | restore_uid(); |
1620 | fatal_add_cleanup(xauthfile_cleanup_proc, s); | |
1621 | return 1; | |
1622 | } | |
1623 | ||
38c295d6 | 1624 | int |
1625 | session_shell_req(Session *s) | |
1626 | { | |
1627 | /* if forced_command == NULL, the shell is execed */ | |
1628 | char *shell = forced_command; | |
1629 | packet_done(); | |
1630 | s->extended = 1; | |
1631 | if (s->ttyfd == -1) | |
1632 | do_exec_no_pty(s, shell, s->pw); | |
1633 | else | |
1634 | do_exec_pty(s, shell, s->pw); | |
1635 | return 1; | |
1636 | } | |
1637 | ||
1638 | int | |
1639 | session_exec_req(Session *s) | |
1640 | { | |
1641 | unsigned int len; | |
1642 | char *command = packet_get_string(&len); | |
1643 | packet_done(); | |
1644 | if (forced_command) { | |
b5e300c2 | 1645 | original_command = command; |
38c295d6 | 1646 | command = forced_command; |
1647 | debug("Forced command '%.500s'", forced_command); | |
1648 | } | |
1649 | s->extended = 1; | |
1650 | if (s->ttyfd == -1) | |
1651 | do_exec_no_pty(s, command, s->pw); | |
1652 | else | |
1653 | do_exec_pty(s, command, s->pw); | |
1654 | if (forced_command == NULL) | |
1655 | xfree(command); | |
1656 | return 1; | |
1657 | } | |
1658 | ||
e78a59f5 | 1659 | void |
1660 | session_input_channel_req(int id, void *arg) | |
1661 | { | |
1662 | unsigned int len; | |
1663 | int reply; | |
1664 | int success = 0; | |
1665 | char *rtype; | |
1666 | Session *s; | |
1667 | Channel *c; | |
1668 | ||
1669 | rtype = packet_get_string(&len); | |
1670 | reply = packet_get_char(); | |
1671 | ||
1672 | s = session_by_channel(id); | |
1673 | if (s == NULL) | |
1674 | fatal("session_input_channel_req: channel %d: no session", id); | |
1675 | c = channel_lookup(id); | |
1676 | if (c == NULL) | |
1677 | fatal("session_input_channel_req: channel %d: bad channel", id); | |
1678 | ||
1679 | debug("session_input_channel_req: session %d channel %d request %s reply %d", | |
1680 | s->self, id, rtype, reply); | |
1681 | ||
1682 | /* | |
1683 | * a session is in LARVAL state until a shell | |
1684 | * or programm is executed | |
1685 | */ | |
1686 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1687 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1688 | success = session_shell_req(s); |
e78a59f5 | 1689 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1690 | success = session_exec_req(s); |
e78a59f5 | 1691 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1692 | success = session_pty_req(s); |
0b242b12 | 1693 | } else if (strcmp(rtype, "x11-req") == 0) { |
1694 | success = session_x11_req(s); | |
1695 | } else if (strcmp(rtype, "subsystem") == 0) { | |
1696 | success = session_subsystem_req(s); | |
e78a59f5 | 1697 | } |
1698 | } | |
1699 | if (strcmp(rtype, "window-change") == 0) { | |
1700 | success = session_window_change_req(s); | |
1701 | } | |
1702 | ||
1703 | if (reply) { | |
1704 | packet_start(success ? | |
1705 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1706 | packet_put_int(c->remote_id); | |
1707 | packet_send(); | |
1708 | } | |
1709 | xfree(rtype); | |
1710 | } | |
1711 | ||
1712 | void | |
1713 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1714 | { | |
1715 | if (!compat20) | |
1716 | fatal("session_set_fds: called for proto != 2.0"); | |
1717 | /* | |
1718 | * now that have a child and a pipe to the child, | |
1719 | * we can activate our channel and register the fd's | |
1720 | */ | |
1721 | if (s->chanid == -1) | |
1722 | fatal("no channel for session %d", s->self); | |
1723 | channel_set_fds(s->chanid, | |
1724 | fdout, fdin, fderr, | |
1725 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ); | |
1726 | } | |
1727 | ||
7368a6c8 | 1728 | void |
1729 | session_pty_cleanup(Session *s) | |
1730 | { | |
1731 | if (s == NULL || s->ttyfd == -1) | |
1732 | return; | |
1733 | ||
1734 | debug("session_pty_cleanup: session %i release %s", s->self, s->tty); | |
1735 | ||
1736 | /* Cancel the cleanup function. */ | |
1737 | fatal_remove_cleanup(pty_cleanup_proc, (void *)s); | |
1738 | ||
1739 | /* Record that the user has logged out. */ | |
1740 | record_logout(s->pid, s->tty); | |
1741 | ||
1742 | /* Release the pseudo-tty. */ | |
1743 | pty_release(s->tty); | |
1744 | ||
1745 | /* | |
1746 | * Close the server side of the socket pairs. We must do this after | |
1747 | * the pty cleanup, so that another process doesn't get this pty | |
1748 | * while we're still cleaning up. | |
1749 | */ | |
1750 | if (close(s->ptymaster) < 0) | |
1751 | error("close(s->ptymaster): %s", strerror(errno)); | |
1752 | } | |
e78a59f5 | 1753 | |
1754 | void | |
1755 | session_exit_message(Session *s, int status) | |
1756 | { | |
1757 | Channel *c; | |
1758 | if (s == NULL) | |
1759 | fatal("session_close: no session"); | |
1760 | c = channel_lookup(s->chanid); | |
1761 | if (c == NULL) | |
1762 | fatal("session_close: session %d: no channel %d", | |
1763 | s->self, s->chanid); | |
1764 | debug("session_exit_message: session %d channel %d pid %d", | |
1765 | s->self, s->chanid, s->pid); | |
1766 | ||
1767 | if (WIFEXITED(status)) { | |
1768 | channel_request_start(s->chanid, | |
1769 | "exit-status", 0); | |
1770 | packet_put_int(WEXITSTATUS(status)); | |
1771 | packet_send(); | |
1772 | } else if (WIFSIGNALED(status)) { | |
1773 | channel_request_start(s->chanid, | |
1774 | "exit-signal", 0); | |
1775 | packet_put_int(WTERMSIG(status)); | |
a64009ad | 1776 | #ifdef WCOREDUMP |
e78a59f5 | 1777 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1778 | #else /* WCOREDUMP */ |
1779 | packet_put_char(0); | |
1780 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1781 | packet_put_cstring(""); |
1782 | packet_put_cstring(""); | |
1783 | packet_send(); | |
1784 | } else { | |
1785 | /* Some weird exit cause. Just exit. */ | |
1786 | packet_disconnect("wait returned status %04x.", status); | |
1787 | } | |
1788 | ||
1789 | /* disconnect channel */ | |
1790 | debug("session_exit_message: release channel %d", s->chanid); | |
1791 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1792 | /* |
1793 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1794 | * interested in data we write. | |
1795 | * Note that we must not call 'chan_read_failed', since there could | |
1796 | * be some more data waiting in the pipe. | |
1797 | */ | |
0b242b12 | 1798 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1799 | chan_write_failed(c); | |
e78a59f5 | 1800 | s->chanid = -1; |
1801 | } | |
1802 | ||
1803 | void | |
1804 | session_free(Session *s) | |
1805 | { | |
1806 | debug("session_free: session %d pid %d", s->self, s->pid); | |
1807 | if (s->term) | |
1808 | xfree(s->term); | |
1809 | if (s->display) | |
1810 | xfree(s->display); | |
1811 | if (s->auth_data) | |
1812 | xfree(s->auth_data); | |
1813 | if (s->auth_proto) | |
1814 | xfree(s->auth_proto); | |
1815 | s->used = 0; | |
1816 | } | |
1817 | ||
1818 | void | |
1819 | session_close(Session *s) | |
1820 | { | |
1821 | session_pty_cleanup(s); | |
1822 | session_free(s); | |
1d1ffb87 | 1823 | session_proctitle(s); |
e78a59f5 | 1824 | } |
1825 | ||
1826 | void | |
1827 | session_close_by_pid(pid_t pid, int status) | |
1828 | { | |
1829 | Session *s = session_by_pid(pid); | |
1830 | if (s == NULL) { | |
1831 | debug("session_close_by_pid: no session for pid %d", s->pid); | |
1832 | return; | |
1833 | } | |
1834 | if (s->chanid != -1) | |
1835 | session_exit_message(s, status); | |
1836 | session_close(s); | |
1837 | } | |
1838 | ||
1839 | /* | |
1840 | * this is called when a channel dies before | |
1841 | * the session 'child' itself dies | |
1842 | */ | |
1843 | void | |
1844 | session_close_by_channel(int id, void *arg) | |
1845 | { | |
1846 | Session *s = session_by_channel(id); | |
1847 | if (s == NULL) { | |
1848 | debug("session_close_by_channel: no session for channel %d", id); | |
1849 | return; | |
1850 | } | |
1851 | /* disconnect channel */ | |
1852 | channel_cancel_cleanup(s->chanid); | |
1853 | s->chanid = -1; | |
1854 | ||
1855 | debug("session_close_by_channel: channel %d kill %d", id, s->pid); | |
1856 | if (s->pid == 0) { | |
1857 | /* close session immediately */ | |
1858 | session_close(s); | |
1859 | } else { | |
1860 | /* notify child, delay session cleanup */ | |
f528fdf2 | 1861 | if (s->pid <= 1) |
512ad3c0 | 1862 | fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid); |
1863 | if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0) | |
e78a59f5 | 1864 | error("session_close_by_channel: kill %d: %s", |
1865 | s->pid, strerror(errno)); | |
1866 | } | |
1867 | } | |
1868 | ||
1d1ffb87 | 1869 | char * |
1870 | session_tty_list(void) | |
1871 | { | |
1872 | static char buf[1024]; | |
1873 | int i; | |
1874 | buf[0] = '\0'; | |
1875 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1876 | Session *s = &sessions[i]; | |
1877 | if (s->used && s->ttyfd != -1) { | |
1878 | if (buf[0] != '\0') | |
1879 | strlcat(buf, ",", sizeof buf); | |
1880 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1881 | } | |
1882 | } | |
1883 | if (buf[0] == '\0') | |
1884 | strlcpy(buf, "notty", sizeof buf); | |
1885 | return buf; | |
1886 | } | |
1887 | ||
1888 | void | |
1889 | session_proctitle(Session *s) | |
1890 | { | |
1891 | if (s->pw == NULL) | |
1892 | error("no user for session %d", s->self); | |
1893 | else | |
1894 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
1895 | } | |
1896 | ||
e78a59f5 | 1897 | void |
1898 | do_authenticated2(void) | |
1899 | { | |
0b65b628 | 1900 | #ifdef HAVE_LOGIN_CAP |
2e73a022 | 1901 | struct passwd *pw; |
0b65b628 | 1902 | #endif |
2e73a022 | 1903 | |
e78a59f5 | 1904 | /* |
1905 | * Cancel the alarm we set to limit the time taken for | |
1906 | * authentication. | |
1907 | */ | |
1908 | alarm(0); | |
3f7a7e4a | 1909 | if (startup_pipe != -1) { |
5540ea9b | 1910 | close(startup_pipe); |
3f7a7e4a | 1911 | startup_pipe = -1; |
1912 | } | |
2e73a022 | 1913 | #ifdef HAVE_LOGIN_CAP |
1914 | pw = auth_get_user(); | |
1915 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
1916 | error("unable to get login class"); | |
1917 | return; | |
1918 | } | |
1919 | #endif | |
e78a59f5 | 1920 | server_loop2(); |
34bce9a5 | 1921 | if (xauthfile) |
1922 | xauthfile_cleanup_proc(NULL); | |
e78a59f5 | 1923 | } |