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7368a6c8 | 1 | /* |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
bcbf86ec | 4 | * |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | * | |
e78a59f5 | 11 | * SSH2 support by Markus Friedl. |
12 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
bcbf86ec | 13 | * |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions | |
16 | * are met: | |
17 | * 1. Redistributions of source code must retain the above copyright | |
18 | * notice, this list of conditions and the following disclaimer. | |
19 | * 2. Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
e78a59f5 | 33 | */ |
7368a6c8 | 34 | |
35 | #include "includes.h" | |
bcbf86ec | 36 | RCSID("$OpenBSD: session.c,v 1.37 2000/09/07 20:27:53 deraadt Exp $"); |
7368a6c8 | 37 | |
38 | #include "xmalloc.h" | |
39 | #include "ssh.h" | |
40 | #include "pty.h" | |
41 | #include "packet.h" | |
42 | #include "buffer.h" | |
43 | #include "cipher.h" | |
44 | #include "mpaux.h" | |
45 | #include "servconf.h" | |
46 | #include "uidswap.h" | |
47 | #include "compat.h" | |
48 | #include "channels.h" | |
49 | #include "nchan.h" | |
50 | ||
e78a59f5 | 51 | #include "bufaux.h" |
52 | #include "ssh2.h" | |
53 | #include "auth.h" | |
38c295d6 | 54 | #include "auth-options.h" |
e78a59f5 | 55 | |
3206bb3b | 56 | #ifdef WITH_IRIX_PROJECT |
57 | #include <proj.h> | |
58 | #endif /* WITH_IRIX_PROJECT */ | |
59 | ||
089fbbd2 | 60 | #if defined(HAVE_USERSEC_H) |
61 | #include <usersec.h> | |
62 | #endif | |
63 | ||
4d33e531 | 64 | #ifdef HAVE_OSF_SIA |
65 | # include <sia.h> | |
66 | # include <siad.h> | |
67 | #endif | |
68 | ||
3c62e7eb | 69 | #ifdef HAVE_CYGWIN |
70 | #include <windows.h> | |
71 | #include <sys/cygwin.h> | |
72 | #define is_winnt (GetVersion() < 0x80000000) | |
73 | #endif | |
74 | ||
3fcce26c | 75 | /* AIX limits */ |
76 | #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE) | |
2a2cb9e7 | 77 | # define S_UFSIZE_HARD S_UFSIZE "_hard" |
78 | # define S_UCPU_HARD S_UCPU "_hard" | |
79 | # define S_UDATA_HARD S_UDATA "_hard" | |
80 | # define S_USTACK_HARD S_USTACK "_hard" | |
81 | # define S_URSS_HARD S_URSS "_hard" | |
82 | # define S_UCORE_HARD S_UCORE "_hard" | |
83 | # define S_UNOFILE_HARD S_UNOFILE "_hard" | |
3fcce26c | 84 | #endif |
85 | ||
2e73a022 | 86 | #ifdef HAVE_LOGIN_CAP |
87 | #include <login_cap.h> | |
88 | #endif | |
89 | ||
7368a6c8 | 90 | /* types */ |
91 | ||
92 | #define TTYSZ 64 | |
93 | typedef struct Session Session; | |
94 | struct Session { | |
95 | int used; | |
96 | int self; | |
0b242b12 | 97 | int extended; |
7368a6c8 | 98 | struct passwd *pw; |
99 | pid_t pid; | |
100 | /* tty */ | |
101 | char *term; | |
102 | int ptyfd, ttyfd, ptymaster; | |
103 | int row, col, xpixel, ypixel; | |
104 | char tty[TTYSZ]; | |
105 | /* X11 */ | |
106 | char *display; | |
107 | int screen; | |
108 | char *auth_proto; | |
109 | char *auth_data; | |
0b242b12 | 110 | int single_connection; |
7368a6c8 | 111 | /* proto 2 */ |
112 | int chanid; | |
113 | }; | |
114 | ||
115 | /* func */ | |
116 | ||
117 | Session *session_new(void); | |
118 | void session_set_fds(Session *s, int fdin, int fdout, int fderr); | |
119 | void session_pty_cleanup(Session *s); | |
1d1ffb87 | 120 | void session_proctitle(Session *s); |
7368a6c8 | 121 | void do_exec_pty(Session *s, const char *command, struct passwd * pw); |
122 | void do_exec_no_pty(Session *s, const char *command, struct passwd * pw); | |
c345cf9d | 123 | void do_login(Session *s); |
7368a6c8 | 124 | |
125 | void | |
126 | do_child(const char *command, struct passwd * pw, const char *term, | |
127 | const char *display, const char *auth_proto, | |
128 | const char *auth_data, const char *ttyname); | |
129 | ||
130 | /* import */ | |
131 | extern ServerOptions options; | |
3a6cb538 | 132 | #ifdef HAVE___PROGNAME |
7368a6c8 | 133 | extern char *__progname; |
3a6cb538 | 134 | #else /* HAVE___PROGNAME */ |
3fd95d9a | 135 | static const char *__progname = "sshd"; |
3a6cb538 | 136 | #endif /* HAVE___PROGNAME */ |
137 | ||
7368a6c8 | 138 | extern int log_stderr; |
139 | extern int debug_flag; | |
c345cf9d | 140 | extern unsigned int utmp_len; |
7368a6c8 | 141 | |
089fbbd2 | 142 | extern int startup_pipe; |
143 | ||
7368a6c8 | 144 | /* Local Xauthority file. */ |
145 | static char *xauthfile; | |
146 | ||
b5e300c2 | 147 | /* original command from peer. */ |
148 | char *original_command = NULL; | |
149 | ||
7368a6c8 | 150 | /* data */ |
151 | #define MAX_SESSIONS 10 | |
152 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 153 | static int num_used_sessions; |
154 | ||
c1ef8333 | 155 | #ifdef WITH_AIXAUTHENTICATE |
156 | /* AIX's lastlogin message, set in auth1.c */ | |
157 | char *aixloginmsg; | |
158 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 159 | |
2e73a022 | 160 | #ifdef HAVE_LOGIN_CAP |
161 | static login_cap_t *lc; | |
162 | #endif | |
163 | ||
7368a6c8 | 164 | /* |
165 | * Remove local Xauthority file. | |
166 | */ | |
167 | void | |
168 | xauthfile_cleanup_proc(void *ignore) | |
169 | { | |
170 | debug("xauthfile_cleanup_proc called"); | |
171 | ||
172 | if (xauthfile != NULL) { | |
173 | char *p; | |
174 | unlink(xauthfile); | |
175 | p = strrchr(xauthfile, '/'); | |
176 | if (p != NULL) { | |
177 | *p = '\0'; | |
178 | rmdir(xauthfile); | |
179 | } | |
180 | xfree(xauthfile); | |
181 | xauthfile = NULL; | |
182 | } | |
183 | } | |
184 | ||
185 | /* | |
186 | * Function to perform cleanup if we get aborted abnormally (e.g., due to a | |
187 | * dropped connection). | |
188 | */ | |
6ae2364d | 189 | void |
7368a6c8 | 190 | pty_cleanup_proc(void *session) |
191 | { | |
192 | Session *s=session; | |
193 | if (s == NULL) | |
194 | fatal("pty_cleanup_proc: no session"); | |
195 | debug("pty_cleanup_proc: %s", s->tty); | |
196 | ||
197 | if (s->pid != 0) { | |
198 | /* Record that the user has logged out. */ | |
199 | record_logout(s->pid, s->tty); | |
200 | } | |
201 | ||
202 | /* Release the pseudo-tty. */ | |
203 | pty_release(s->tty); | |
204 | } | |
205 | ||
206 | /* | |
207 | * Prepares for an interactive session. This is called after the user has | |
208 | * been successfully authenticated. During this message exchange, pseudo | |
209 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
210 | * are requested, etc. | |
211 | */ | |
6ae2364d | 212 | void |
7368a6c8 | 213 | do_authenticated(struct passwd * pw) |
214 | { | |
215 | Session *s; | |
b5e300c2 | 216 | int type, fd; |
7368a6c8 | 217 | int compression_level = 0, enable_compression_after_reply = 0; |
218 | int have_pty = 0; | |
219 | char *command; | |
220 | int n_bytes; | |
221 | int plen; | |
222 | unsigned int proto_len, data_len, dlen; | |
223 | ||
224 | /* | |
225 | * Cancel the alarm we set to limit the time taken for | |
226 | * authentication. | |
227 | */ | |
228 | alarm(0); | |
3f7a7e4a | 229 | if (startup_pipe != -1) { |
5540ea9b | 230 | close(startup_pipe); |
3f7a7e4a | 231 | startup_pipe = -1; |
232 | } | |
7368a6c8 | 233 | |
234 | /* | |
235 | * Inform the channel mechanism that we are the server side and that | |
236 | * the client may request to connect to any port at all. (The user | |
237 | * could do it anyway, and we wouldn\'t know what is permitted except | |
238 | * by the client telling us, so we can equally well trust the client | |
239 | * not to request anything bogus.) | |
240 | */ | |
241 | if (!no_port_forwarding_flag) | |
242 | channel_permit_all_opens(); | |
243 | ||
244 | s = session_new(); | |
0b242b12 | 245 | s->pw = pw; |
7368a6c8 | 246 | |
2e73a022 | 247 | #ifdef HAVE_LOGIN_CAP |
248 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
249 | error("unable to get login class"); | |
250 | return; | |
251 | } | |
252 | #endif | |
253 | ||
7368a6c8 | 254 | /* |
255 | * We stay in this loop until the client requests to execute a shell | |
256 | * or a command. | |
257 | */ | |
258 | for (;;) { | |
259 | int success = 0; | |
260 | ||
261 | /* Get a packet from the client. */ | |
262 | type = packet_read(&plen); | |
263 | ||
264 | /* Process the packet. */ | |
265 | switch (type) { | |
266 | case SSH_CMSG_REQUEST_COMPRESSION: | |
267 | packet_integrity_check(plen, 4, type); | |
268 | compression_level = packet_get_int(); | |
269 | if (compression_level < 1 || compression_level > 9) { | |
270 | packet_send_debug("Received illegal compression level %d.", | |
271 | compression_level); | |
272 | break; | |
273 | } | |
274 | /* Enable compression after we have responded with SUCCESS. */ | |
275 | enable_compression_after_reply = 1; | |
276 | success = 1; | |
277 | break; | |
278 | ||
279 | case SSH_CMSG_REQUEST_PTY: | |
280 | if (no_pty_flag) { | |
281 | debug("Allocating a pty not permitted for this authentication."); | |
282 | break; | |
283 | } | |
284 | if (have_pty) | |
285 | packet_disconnect("Protocol error: you already have a pty."); | |
286 | ||
287 | debug("Allocating pty."); | |
288 | ||
289 | /* Allocate a pty and open it. */ | |
290 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, | |
291 | sizeof(s->tty))) { | |
292 | error("Failed to allocate pty."); | |
293 | break; | |
294 | } | |
295 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
296 | pty_setowner(pw, s->tty); | |
297 | ||
298 | /* Get TERM from the packet. Note that the value may be of arbitrary length. */ | |
299 | s->term = packet_get_string(&dlen); | |
300 | packet_integrity_check(dlen, strlen(s->term), type); | |
301 | /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */ | |
302 | /* Remaining bytes */ | |
303 | n_bytes = plen - (4 + dlen + 4 * 4); | |
304 | ||
305 | if (strcmp(s->term, "") == 0) { | |
306 | xfree(s->term); | |
307 | s->term = NULL; | |
308 | } | |
309 | /* Get window size from the packet. */ | |
310 | s->row = packet_get_int(); | |
311 | s->col = packet_get_int(); | |
312 | s->xpixel = packet_get_int(); | |
313 | s->ypixel = packet_get_int(); | |
314 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
315 | ||
316 | /* Get tty modes from the packet. */ | |
317 | tty_parse_modes(s->ttyfd, &n_bytes); | |
318 | packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type); | |
319 | ||
1d1ffb87 | 320 | session_proctitle(s); |
321 | ||
7368a6c8 | 322 | /* Indicate that we now have a pty. */ |
323 | success = 1; | |
324 | have_pty = 1; | |
325 | break; | |
326 | ||
327 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
328 | if (!options.x11_forwarding) { | |
329 | packet_send_debug("X11 forwarding disabled in server configuration file."); | |
330 | break; | |
331 | } | |
6fc1e9f3 | 332 | if (!options.xauth_location) { |
333 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
334 | break; | |
335 | } | |
7368a6c8 | 336 | if (no_x11_forwarding_flag) { |
337 | packet_send_debug("X11 forwarding not permitted for this authentication."); | |
338 | break; | |
339 | } | |
340 | debug("Received request for X11 forwarding with auth spoofing."); | |
341 | if (s->display != NULL) | |
342 | packet_disconnect("Protocol error: X11 display already set."); | |
343 | ||
344 | s->auth_proto = packet_get_string(&proto_len); | |
345 | s->auth_data = packet_get_string(&data_len); | |
346 | packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type); | |
347 | ||
348 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER) | |
349 | s->screen = packet_get_int(); | |
350 | else | |
351 | s->screen = 0; | |
352 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
353 | ||
354 | if (s->display == NULL) | |
355 | break; | |
356 | ||
357 | /* Setup to always have a local .Xauthority. */ | |
358 | xauthfile = xmalloc(MAXPATHLEN); | |
359 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
360 | temporarily_use_uid(pw->pw_uid); | |
361 | if (mkdtemp(xauthfile) == NULL) { | |
362 | restore_uid(); | |
363 | error("private X11 dir: mkdtemp %s failed: %s", | |
364 | xauthfile, strerror(errno)); | |
365 | xfree(xauthfile); | |
366 | xauthfile = NULL; | |
0b242b12 | 367 | /* XXXX remove listening channels */ |
7368a6c8 | 368 | break; |
369 | } | |
370 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 371 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
372 | if (fd >= 0) | |
373 | close(fd); | |
7368a6c8 | 374 | restore_uid(); |
375 | fatal_add_cleanup(xauthfile_cleanup_proc, NULL); | |
376 | success = 1; | |
377 | break; | |
7368a6c8 | 378 | |
379 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
380 | if (no_agent_forwarding_flag || compat13) { | |
381 | debug("Authentication agent forwarding not permitted for this authentication."); | |
382 | break; | |
383 | } | |
384 | debug("Received authentication agent forwarding request."); | |
6fc1e9f3 | 385 | success = auth_input_request_forwarding(pw); |
7368a6c8 | 386 | break; |
387 | ||
388 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
389 | if (no_port_forwarding_flag) { | |
390 | debug("Port forwarding not permitted for this authentication."); | |
391 | break; | |
392 | } | |
393 | debug("Received TCP/IP port forwarding request."); | |
1d1ffb87 | 394 | channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 395 | success = 1; |
396 | break; | |
397 | ||
398 | case SSH_CMSG_MAX_PACKET_SIZE: | |
399 | if (packet_set_maxsize(packet_get_int()) > 0) | |
400 | success = 1; | |
401 | break; | |
402 | ||
403 | case SSH_CMSG_EXEC_SHELL: | |
404 | case SSH_CMSG_EXEC_CMD: | |
405 | /* Set interactive/non-interactive mode. */ | |
406 | packet_set_interactive(have_pty || s->display != NULL, | |
407 | options.keepalives); | |
408 | ||
409 | if (type == SSH_CMSG_EXEC_CMD) { | |
410 | command = packet_get_string(&dlen); | |
411 | debug("Exec command '%.500s'", command); | |
412 | packet_integrity_check(plen, 4 + dlen, type); | |
413 | } else { | |
414 | command = NULL; | |
415 | packet_integrity_check(plen, 0, type); | |
416 | } | |
417 | if (forced_command != NULL) { | |
b5e300c2 | 418 | original_command = command; |
7368a6c8 | 419 | command = forced_command; |
420 | debug("Forced command '%.500s'", forced_command); | |
421 | } | |
422 | if (have_pty) | |
423 | do_exec_pty(s, command, pw); | |
424 | else | |
425 | do_exec_no_pty(s, command, pw); | |
426 | ||
427 | if (command != NULL) | |
428 | xfree(command); | |
429 | /* Cleanup user's local Xauthority file. */ | |
430 | if (xauthfile) | |
431 | xauthfile_cleanup_proc(NULL); | |
432 | return; | |
433 | ||
434 | default: | |
435 | /* | |
436 | * Any unknown messages in this phase are ignored, | |
437 | * and a failure message is returned. | |
438 | */ | |
439 | log("Unknown packet type received after authentication: %d", type); | |
440 | } | |
441 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
442 | packet_send(); | |
443 | packet_write_wait(); | |
444 | ||
445 | /* Enable compression now that we have replied if appropriate. */ | |
446 | if (enable_compression_after_reply) { | |
447 | enable_compression_after_reply = 0; | |
448 | packet_start_compression(compression_level); | |
449 | } | |
450 | } | |
451 | } | |
452 | ||
453 | /* | |
454 | * This is called to fork and execute a command when we have no tty. This | |
455 | * will call do_child from the child, and server_loop from the parent after | |
456 | * setting up file descriptors and such. | |
457 | */ | |
6ae2364d | 458 | void |
7368a6c8 | 459 | do_exec_no_pty(Session *s, const char *command, struct passwd * pw) |
460 | { | |
461 | int pid; | |
462 | ||
463 | #ifdef USE_PIPES | |
464 | int pin[2], pout[2], perr[2]; | |
465 | /* Allocate pipes for communicating with the program. */ | |
466 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
467 | packet_disconnect("Could not create pipes: %.100s", | |
468 | strerror(errno)); | |
469 | #else /* USE_PIPES */ | |
470 | int inout[2], err[2]; | |
471 | /* Uses socket pairs to communicate with the program. */ | |
472 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
473 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
474 | packet_disconnect("Could not create socket pairs: %.100s", | |
475 | strerror(errno)); | |
476 | #endif /* USE_PIPES */ | |
477 | if (s == NULL) | |
478 | fatal("do_exec_no_pty: no session"); | |
479 | ||
1d1ffb87 | 480 | session_proctitle(s); |
7368a6c8 | 481 | |
482 | #ifdef USE_PAM | |
483 | do_pam_setcred(); | |
484 | #endif /* USE_PAM */ | |
485 | ||
486 | /* Fork the child. */ | |
487 | if ((pid = fork()) == 0) { | |
488 | /* Child. Reinitialize the log since the pid has changed. */ | |
489 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
490 | ||
491 | /* | |
492 | * Create a new session and process group since the 4.4BSD | |
493 | * setlogin() affects the entire process group. | |
494 | */ | |
495 | if (setsid() < 0) | |
496 | error("setsid failed: %.100s", strerror(errno)); | |
497 | ||
498 | #ifdef USE_PIPES | |
499 | /* | |
500 | * Redirect stdin. We close the parent side of the socket | |
501 | * pair, and make the child side the standard input. | |
502 | */ | |
503 | close(pin[1]); | |
504 | if (dup2(pin[0], 0) < 0) | |
505 | perror("dup2 stdin"); | |
506 | close(pin[0]); | |
507 | ||
508 | /* Redirect stdout. */ | |
509 | close(pout[0]); | |
510 | if (dup2(pout[1], 1) < 0) | |
511 | perror("dup2 stdout"); | |
512 | close(pout[1]); | |
513 | ||
514 | /* Redirect stderr. */ | |
515 | close(perr[0]); | |
516 | if (dup2(perr[1], 2) < 0) | |
517 | perror("dup2 stderr"); | |
518 | close(perr[1]); | |
519 | #else /* USE_PIPES */ | |
520 | /* | |
521 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
522 | * use the same socket, as some programs (particularly rdist) | |
523 | * seem to depend on it. | |
524 | */ | |
525 | close(inout[1]); | |
526 | close(err[1]); | |
527 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
528 | perror("dup2 stdin"); | |
529 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
530 | perror("dup2 stdout"); | |
531 | if (dup2(err[0], 2) < 0) /* stderr */ | |
532 | perror("dup2 stderr"); | |
533 | #endif /* USE_PIPES */ | |
534 | ||
535 | /* Do processing for the child (exec command etc). */ | |
536 | do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL); | |
537 | /* NOTREACHED */ | |
538 | } | |
3c62e7eb | 539 | #ifdef HAVE_CYGWIN |
540 | if (is_winnt) | |
541 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
542 | #endif | |
7368a6c8 | 543 | if (pid < 0) |
544 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
545 | s->pid = pid; | |
546 | #ifdef USE_PIPES | |
547 | /* We are the parent. Close the child sides of the pipes. */ | |
548 | close(pin[0]); | |
549 | close(pout[1]); | |
550 | close(perr[1]); | |
551 | ||
e78a59f5 | 552 | if (compat20) { |
0b242b12 | 553 | session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1); |
e78a59f5 | 554 | } else { |
555 | /* Enter the interactive session. */ | |
556 | server_loop(pid, pin[1], pout[0], perr[0]); | |
557 | /* server_loop has closed pin[1], pout[1], and perr[1]. */ | |
558 | } | |
7368a6c8 | 559 | #else /* USE_PIPES */ |
560 | /* We are the parent. Close the child sides of the socket pairs. */ | |
561 | close(inout[0]); | |
562 | close(err[0]); | |
563 | ||
564 | /* | |
565 | * Enter the interactive session. Note: server_loop must be able to | |
566 | * handle the case that fdin and fdout are the same. | |
567 | */ | |
e78a59f5 | 568 | if (compat20) { |
0b242b12 | 569 | session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1); |
e78a59f5 | 570 | } else { |
571 | server_loop(pid, inout[1], inout[1], err[1]); | |
572 | /* server_loop has closed inout[1] and err[1]. */ | |
573 | } | |
7368a6c8 | 574 | #endif /* USE_PIPES */ |
575 | } | |
576 | ||
577 | /* | |
578 | * This is called to fork and execute a command when we have a tty. This | |
579 | * will call do_child from the child, and server_loop from the parent after | |
580 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
581 | * lastlog, and other such operations. | |
582 | */ | |
6ae2364d | 583 | void |
7368a6c8 | 584 | do_exec_pty(Session *s, const char *command, struct passwd * pw) |
585 | { | |
7368a6c8 | 586 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 587 | pid_t pid; |
7368a6c8 | 588 | |
589 | if (s == NULL) | |
590 | fatal("do_exec_pty: no session"); | |
591 | ptyfd = s->ptyfd; | |
592 | ttyfd = s->ttyfd; | |
593 | ||
7368a6c8 | 594 | #ifdef USE_PAM |
595 | do_pam_session(pw->pw_name, s->tty); | |
596 | do_pam_setcred(); | |
597 | #endif /* USE_PAM */ | |
598 | ||
599 | /* Fork the child. */ | |
600 | if ((pid = fork()) == 0) { | |
c345cf9d | 601 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 602 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
603 | ||
604 | /* Close the master side of the pseudo tty. */ | |
605 | close(ptyfd); | |
606 | ||
607 | /* Make the pseudo tty our controlling tty. */ | |
608 | pty_make_controlling_tty(&ttyfd, s->tty); | |
609 | ||
610 | /* Redirect stdin from the pseudo tty. */ | |
611 | if (dup2(ttyfd, fileno(stdin)) < 0) | |
612 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
613 | ||
614 | /* Redirect stdout to the pseudo tty. */ | |
615 | if (dup2(ttyfd, fileno(stdout)) < 0) | |
616 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
617 | ||
618 | /* Redirect stderr to the pseudo tty. */ | |
619 | if (dup2(ttyfd, fileno(stderr)) < 0) | |
620 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
621 | ||
622 | /* Close the extra descriptor for the pseudo tty. */ | |
623 | close(ttyfd); | |
624 | ||
c345cf9d | 625 | /* record login, etc. similar to login(1) */ |
626 | if (command == NULL && !options.use_login) | |
627 | do_login(s); | |
7368a6c8 | 628 | |
7368a6c8 | 629 | /* Do common processing for the child, such as execing the command. */ |
71276795 | 630 | do_child(command, pw, s->term, s->display, s->auth_proto, |
631 | s->auth_data, s->tty); | |
7368a6c8 | 632 | /* NOTREACHED */ |
633 | } | |
3c62e7eb | 634 | #ifdef HAVE_CYGWIN |
635 | if (is_winnt) | |
636 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
637 | #endif | |
7368a6c8 | 638 | if (pid < 0) |
639 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
640 | s->pid = pid; | |
641 | ||
642 | /* Parent. Close the slave side of the pseudo tty. */ | |
643 | close(ttyfd); | |
644 | ||
645 | /* | |
646 | * Create another descriptor of the pty master side for use as the | |
647 | * standard input. We could use the original descriptor, but this | |
648 | * simplifies code in server_loop. The descriptor is bidirectional. | |
649 | */ | |
650 | fdout = dup(ptyfd); | |
651 | if (fdout < 0) | |
652 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
653 | ||
654 | /* we keep a reference to the pty master */ | |
655 | ptymaster = dup(ptyfd); | |
656 | if (ptymaster < 0) | |
657 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
658 | s->ptymaster = ptymaster; | |
659 | ||
660 | /* Enter interactive session. */ | |
e78a59f5 | 661 | if (compat20) { |
662 | session_set_fds(s, ptyfd, fdout, -1); | |
663 | } else { | |
664 | server_loop(pid, ptyfd, fdout, -1); | |
665 | /* server_loop _has_ closed ptyfd and fdout. */ | |
666 | session_pty_cleanup(s); | |
667 | } | |
7368a6c8 | 668 | } |
669 | ||
c345cf9d | 670 | const char * |
671 | get_remote_name_or_ip(void) | |
672 | { | |
673 | static const char *remote = ""; | |
674 | if (utmp_len > 0) | |
675 | remote = get_canonical_hostname(); | |
676 | if (utmp_len == 0 || strlen(remote) > utmp_len) | |
677 | remote = get_remote_ipaddr(); | |
678 | return remote; | |
679 | } | |
680 | ||
681 | /* administrative, login(1)-like work */ | |
682 | void | |
683 | do_login(Session *s) | |
684 | { | |
685 | FILE *f; | |
686 | char *time_string; | |
687 | char buf[256]; | |
b5e300c2 | 688 | char hostname[MAXHOSTNAMELEN]; |
c345cf9d | 689 | socklen_t fromlen; |
690 | struct sockaddr_storage from; | |
691 | struct stat st; | |
692 | time_t last_login_time; | |
693 | struct passwd * pw = s->pw; | |
694 | pid_t pid = getpid(); | |
695 | ||
696 | /* | |
697 | * Get IP address of client. If the connection is not a socket, let | |
698 | * the address be 0.0.0.0. | |
699 | */ | |
700 | memset(&from, 0, sizeof(from)); | |
701 | if (packet_connection_is_on_socket()) { | |
702 | fromlen = sizeof(from); | |
703 | if (getpeername(packet_get_connection_in(), | |
704 | (struct sockaddr *) & from, &fromlen) < 0) { | |
705 | debug("getpeername: %.100s", strerror(errno)); | |
706 | fatal_cleanup(); | |
707 | } | |
708 | } | |
709 | ||
b5e300c2 | 710 | /* Get the time and hostname when the user last logged in. */ |
711 | last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name, | |
712 | hostname, sizeof(hostname)); | |
713 | ||
bcbf86ec | 714 | /* Get the time and hostname when the user last logged in. */ |
715 | hostname[0] = '\0'; | |
716 | last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name, | |
717 | hostname, sizeof(hostname)); | |
718 | ||
c345cf9d | 719 | /* Record that there was a login on that tty from the remote host. */ |
720 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
721 | get_remote_name_or_ip(), (struct sockaddr *)&from); | |
722 | ||
723 | /* Done if .hushlogin exists. */ | |
724 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
2e73a022 | 725 | #ifdef HAVE_LOGIN_CAP |
726 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
727 | #else | |
c345cf9d | 728 | if (stat(buf, &st) >= 0) |
2e73a022 | 729 | #endif |
c345cf9d | 730 | return; |
731 | ||
732 | #ifdef USE_PAM | |
733 | print_pam_messages(); | |
ad55cd03 | 734 | /* If password change is needed, do it now. */ |
735 | do_pam_chauthtok(); | |
c345cf9d | 736 | #endif /* USE_PAM */ |
737 | #ifdef WITH_AIXAUTHENTICATE | |
738 | if (aixloginmsg && *aixloginmsg) | |
739 | printf("%s\n", aixloginmsg); | |
740 | #endif /* WITH_AIXAUTHENTICATE */ | |
741 | ||
c345cf9d | 742 | if (last_login_time != 0) { |
743 | time_string = ctime(&last_login_time); | |
744 | if (strchr(time_string, '\n')) | |
745 | *strchr(time_string, '\n') = 0; | |
746 | if (strcmp(buf, "") == 0) | |
747 | printf("Last login: %s\r\n", time_string); | |
748 | else | |
bcbf86ec | 749 | printf("Last login: %s from %s\r\n", time_string, hostname); |
c345cf9d | 750 | } |
751 | if (options.print_motd) { | |
2e73a022 | 752 | #ifdef HAVE_LOGIN_CAP |
753 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
754 | "/etc/motd"), "r"); | |
755 | #else | |
c345cf9d | 756 | f = fopen("/etc/motd", "r"); |
2e73a022 | 757 | #endif |
c345cf9d | 758 | if (f) { |
759 | while (fgets(buf, sizeof(buf), f)) | |
760 | fputs(buf, stdout); | |
761 | fclose(f); | |
762 | } | |
763 | } | |
764 | } | |
765 | ||
7368a6c8 | 766 | /* |
767 | * Sets the value of the given variable in the environment. If the variable | |
768 | * already exists, its value is overriden. | |
769 | */ | |
6ae2364d | 770 | void |
7368a6c8 | 771 | child_set_env(char ***envp, unsigned int *envsizep, const char *name, |
772 | const char *value) | |
773 | { | |
774 | unsigned int i, namelen; | |
775 | char **env; | |
776 | ||
777 | /* | |
778 | * Find the slot where the value should be stored. If the variable | |
779 | * already exists, we reuse the slot; otherwise we append a new slot | |
780 | * at the end of the array, expanding if necessary. | |
781 | */ | |
782 | env = *envp; | |
783 | namelen = strlen(name); | |
784 | for (i = 0; env[i]; i++) | |
785 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
786 | break; | |
787 | if (env[i]) { | |
788 | /* Reuse the slot. */ | |
789 | xfree(env[i]); | |
790 | } else { | |
791 | /* New variable. Expand if necessary. */ | |
792 | if (i >= (*envsizep) - 1) { | |
793 | (*envsizep) += 50; | |
794 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
795 | } | |
796 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
797 | env[i + 1] = NULL; | |
798 | } | |
799 | ||
800 | /* Allocate space and format the variable in the appropriate slot. */ | |
801 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
802 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
803 | } | |
804 | ||
805 | /* | |
806 | * Reads environment variables from the given file and adds/overrides them | |
807 | * into the environment. If the file does not exist, this does nothing. | |
808 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
809 | * and assignments of the form name=value. No other forms are allowed. | |
810 | */ | |
6ae2364d | 811 | void |
7368a6c8 | 812 | read_environment_file(char ***env, unsigned int *envsize, |
813 | const char *filename) | |
814 | { | |
815 | FILE *f; | |
816 | char buf[4096]; | |
817 | char *cp, *value; | |
818 | ||
819 | f = fopen(filename, "r"); | |
820 | if (!f) | |
821 | return; | |
822 | ||
823 | while (fgets(buf, sizeof(buf), f)) { | |
824 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
825 | ; | |
826 | if (!*cp || *cp == '#' || *cp == '\n') | |
827 | continue; | |
828 | if (strchr(cp, '\n')) | |
829 | *strchr(cp, '\n') = '\0'; | |
830 | value = strchr(cp, '='); | |
831 | if (value == NULL) { | |
832 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
833 | continue; | |
834 | } | |
71276795 | 835 | /* |
836 | * Replace the equals sign by nul, and advance value to | |
837 | * the value string. | |
838 | */ | |
7368a6c8 | 839 | *value = '\0'; |
840 | value++; | |
841 | child_set_env(env, envsize, cp, value); | |
842 | } | |
843 | fclose(f); | |
844 | } | |
845 | ||
846 | #ifdef USE_PAM | |
847 | /* | |
848 | * Sets any environment variables which have been specified by PAM | |
849 | */ | |
850 | void do_pam_environment(char ***env, int *envsize) | |
851 | { | |
852 | char *equals, var_name[512], var_val[512]; | |
853 | char **pam_env; | |
854 | int i; | |
855 | ||
856 | if ((pam_env = fetch_pam_environment()) == NULL) | |
857 | return; | |
858 | ||
859 | for(i = 0; pam_env[i] != NULL; i++) { | |
860 | if ((equals = strstr(pam_env[i], "=")) == NULL) | |
861 | continue; | |
862 | ||
863 | if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) { | |
864 | memset(var_name, '\0', sizeof(var_name)); | |
865 | memset(var_val, '\0', sizeof(var_val)); | |
866 | ||
867 | strncpy(var_name, pam_env[i], equals - pam_env[i]); | |
868 | strcpy(var_val, equals + 1); | |
869 | ||
22d89d24 | 870 | debug3("PAM environment: %s=%s", var_name, var_val); |
7368a6c8 | 871 | |
872 | child_set_env(env, envsize, var_name, var_val); | |
873 | } | |
874 | } | |
875 | } | |
876 | #endif /* USE_PAM */ | |
877 | ||
22d89d24 | 878 | |
879 | #ifdef HAVE_CYGWIN | |
880 | void copy_environment(char ***env, int *envsize) | |
881 | { | |
882 | char *equals, var_name[512], var_val[512]; | |
883 | int i; | |
884 | ||
885 | for(i = 0; environ[i] != NULL; i++) { | |
886 | if ((equals = strstr(environ[i], "=")) == NULL) | |
887 | continue; | |
888 | ||
889 | if (strlen(environ[i]) < (sizeof(var_name) - 1)) { | |
890 | memset(var_name, '\0', sizeof(var_name)); | |
891 | memset(var_val, '\0', sizeof(var_val)); | |
892 | ||
893 | strncpy(var_name, environ[i], equals - environ[i]); | |
894 | strcpy(var_val, equals + 1); | |
895 | ||
896 | debug3("Copy environment: %s=%s", var_name, var_val); | |
897 | ||
898 | child_set_env(env, envsize, var_name, var_val); | |
899 | } | |
900 | } | |
901 | } | |
902 | #endif | |
903 | ||
5fa45897 | 904 | #if defined(HAVE_GETUSERATTR) |
905 | /* | |
906 | * AIX-specific login initialisation | |
907 | */ | |
908 | void set_limit(char *user, char *soft, char *hard, int resource, int mult) | |
909 | { | |
910 | struct rlimit rlim; | |
56118702 | 911 | int slim, hlim; |
5fa45897 | 912 | |
913 | getrlimit(resource, &rlim); | |
914 | ||
56118702 | 915 | slim = 0; |
916 | if (getuserattr(user, soft, &slim, SEC_INT) != -1) { | |
917 | if (slim < 0) { | |
918 | rlim.rlim_cur = RLIM_INFINITY; | |
919 | } else if (slim != 0) { | |
920 | /* See the wackiness below */ | |
921 | if (rlim.rlim_cur == slim * mult) | |
922 | slim = 0; | |
923 | else | |
924 | rlim.rlim_cur = slim * mult; | |
925 | } | |
926 | } | |
5fa45897 | 927 | |
56118702 | 928 | hlim = 0; |
929 | if (getuserattr(user, hard, &hlim, SEC_INT) != -1) { | |
930 | if (hlim < 0) { | |
931 | rlim.rlim_max = RLIM_INFINITY; | |
932 | } else if (hlim != 0) { | |
933 | rlim.rlim_max = hlim * mult; | |
934 | } | |
935 | } | |
5fa45897 | 936 | |
56118702 | 937 | /* |
938 | * XXX For cpu and fsize the soft limit is set to the hard limit | |
939 | * if the hard limit is left at its default value and the soft limit | |
940 | * is changed from its default value, either by requesting it | |
941 | * (slim == 0) or by setting it to the current default. At least | |
942 | * that's how rlogind does it. If you're confused you're not alone. | |
943 | * Bug or feature? AIX 4.3.1.2 | |
944 | */ | |
945 | if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu")) | |
946 | && hlim == 0 && slim != 0) | |
947 | rlim.rlim_max = rlim.rlim_cur; | |
948 | /* A specified hard limit limits the soft limit */ | |
949 | else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max) | |
950 | rlim.rlim_cur = rlim.rlim_max; | |
951 | /* A soft limit can increase a hard limit */ | |
952 | else if (rlim.rlim_cur > rlim.rlim_max) | |
5fa45897 | 953 | rlim.rlim_max = rlim.rlim_cur; |
954 | ||
955 | if (setrlimit(resource, &rlim) != 0) | |
56118702 | 956 | error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno)); |
5fa45897 | 957 | } |
958 | ||
959 | void set_limits_from_userattr(char *user) | |
960 | { | |
961 | int mask; | |
962 | char buf[16]; | |
963 | ||
964 | set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512); | |
965 | set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1); | |
966 | set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512); | |
967 | set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512); | |
968 | set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512); | |
969 | set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512); | |
970 | #if defined(S_UNOFILE) | |
971 | set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1); | |
972 | #endif | |
973 | ||
974 | if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) { | |
975 | /* Convert decimal to octal */ | |
976 | (void) snprintf(buf, sizeof(buf), "%d", mask); | |
977 | if (sscanf(buf, "%o", &mask) == 1) | |
978 | umask(mask); | |
979 | } | |
980 | } | |
981 | #endif /* defined(HAVE_GETUSERATTR) */ | |
982 | ||
7368a6c8 | 983 | /* |
984 | * Performs common processing for the child, such as setting up the | |
985 | * environment, closing extra file descriptors, setting the user and group | |
986 | * ids, and executing the command or shell. | |
987 | */ | |
6ae2364d | 988 | void |
7368a6c8 | 989 | do_child(const char *command, struct passwd * pw, const char *term, |
990 | const char *display, const char *auth_proto, | |
991 | const char *auth_data, const char *ttyname) | |
992 | { | |
b5e300c2 | 993 | const char *shell, *hostname = NULL, *cp = NULL; |
7368a6c8 | 994 | char buf[256]; |
6fc1e9f3 | 995 | char cmd[1024]; |
2e73a022 | 996 | FILE *f = NULL; |
7368a6c8 | 997 | unsigned int envsize, i; |
998 | char **env; | |
999 | extern char **environ; | |
1000 | struct stat st; | |
1001 | char *argv[10]; | |
3206bb3b | 1002 | #ifdef WITH_IRIX_PROJECT |
1003 | prid_t projid; | |
1004 | #endif /* WITH_IRIX_PROJECT */ | |
7368a6c8 | 1005 | |
fa649821 | 1006 | /* login(1) is only called if we execute the login shell */ |
1007 | if (options.use_login && command != NULL) | |
1008 | options.use_login = 0; | |
1009 | ||
7368a6c8 | 1010 | #ifndef USE_PAM /* pam_nologin handles this */ |
2e73a022 | 1011 | if (!options.use_login) { |
1012 | # ifdef HAVE_LOGIN_CAP | |
1013 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1014 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1015 | _PATH_NOLOGIN), "r"); | |
1016 | # else /* HAVE_LOGIN_CAP */ | |
1017 | if (pw->pw_uid) | |
1018 | f = fopen(_PATH_NOLOGIN, "r"); | |
1019 | # endif /* HAVE_LOGIN_CAP */ | |
1020 | if (f) { | |
1021 | /* /etc/nologin exists. Print its contents and exit. */ | |
1022 | while (fgets(buf, sizeof(buf), f)) | |
1023 | fputs(buf, stderr); | |
1024 | fclose(f); | |
7368a6c8 | 1025 | exit(254); |
2e73a022 | 1026 | } |
7368a6c8 | 1027 | } |
1028 | #endif /* USE_PAM */ | |
1029 | ||
2e73a022 | 1030 | /* Set login name, uid, gid, and groups. */ |
7368a6c8 | 1031 | /* Login(1) does this as well, and it needs uid 0 for the "-h" |
1032 | switch, so we let login(1) to this for us. */ | |
1033 | if (!options.use_login) { | |
4d33e531 | 1034 | #ifdef HAVE_OSF_SIA |
1035 | extern char **saved_argv; | |
1036 | extern int saved_argc; | |
1037 | char *host = get_canonical_hostname (); | |
1038 | ||
1039 | if (sia_become_user(NULL, saved_argc, saved_argv, host, | |
1040 | pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) != | |
1041 | SIASUCCESS) { | |
1042 | perror("sia_become_user"); | |
1043 | exit(1); | |
1044 | } | |
1045 | if (setreuid(geteuid(), geteuid()) < 0) { | |
1046 | perror("setreuid"); | |
1047 | exit(1); | |
1048 | } | |
1049 | #else /* HAVE_OSF_SIA */ | |
3c62e7eb | 1050 | #ifdef HAVE_CYGWIN |
1051 | if (is_winnt) { | |
1052 | #else | |
7368a6c8 | 1053 | if (getuid() == 0 || geteuid() == 0) { |
3c62e7eb | 1054 | #endif |
2e73a022 | 1055 | # ifdef HAVE_GETUSERATTR |
5fa45897 | 1056 | set_limits_from_userattr(pw->pw_name); |
2e73a022 | 1057 | # endif /* HAVE_GETUSERATTR */ |
1058 | # ifdef HAVE_LOGIN_CAP | |
1059 | if (setusercontext(lc, pw, pw->pw_uid, | |
1060 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1061 | perror("unable to set user context"); | |
1062 | exit(1); | |
1063 | } | |
1064 | # else /* HAVE_LOGIN_CAP */ | |
1065 | if (setlogin(pw->pw_name) < 0) | |
1066 | error("setlogin failed: %s", strerror(errno)); | |
7368a6c8 | 1067 | if (setgid(pw->pw_gid) < 0) { |
1068 | perror("setgid"); | |
1069 | exit(1); | |
1070 | } | |
1071 | /* Initialize the group list. */ | |
1072 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1073 | perror("initgroups"); | |
1074 | exit(1); | |
1075 | } | |
1076 | endgrent(); | |
2e73a022 | 1077 | # ifdef WITH_IRIX_ARRAY |
3206bb3b | 1078 | /* initialize array session */ |
1079 | if (newarraysess() != 0) | |
1080 | fatal("Failed to set up new array session: %.100s", | |
1081 | strerror(errno)); | |
2e73a022 | 1082 | # endif /* WITH_IRIX_ARRAY */ |
1083 | # ifdef WITH_IRIX_PROJECT | |
3206bb3b | 1084 | /* initialize irix project info */ |
1085 | if ((projid = getdfltprojuser(pw->pw_name)) == -1) { | |
1086 | debug("Failed to get project id, using projid 0"); | |
1087 | projid = 0; | |
1088 | } | |
3206bb3b | 1089 | if (setprid(projid)) |
1090 | fatal("Failed to initialize project %d for %s: %.100s", | |
1091 | (int)projid, pw->pw_name, strerror(errno)); | |
2e73a022 | 1092 | # endif /* WITH_IRIX_PROJECT */ |
7368a6c8 | 1093 | /* Permanently switch to the desired uid. */ |
1094 | permanently_set_uid(pw->pw_uid); | |
2e73a022 | 1095 | # endif /* HAVE_LOGIN_CAP */ |
7368a6c8 | 1096 | } |
2e73a022 | 1097 | #endif /* HAVE_OSF_SIA */ |
1098 | ||
3c62e7eb | 1099 | #ifdef HAVE_CYGWIN |
1100 | if (is_winnt) | |
1101 | #endif | |
7368a6c8 | 1102 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
14a9a859 | 1103 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
7368a6c8 | 1104 | } |
1105 | /* | |
1106 | * Get the shell from the password data. An empty shell field is | |
1107 | * legal, and means /bin/sh. | |
1108 | */ | |
1109 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
2e73a022 | 1110 | #ifdef HAVE_LOGIN_CAP |
1111 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1112 | #endif | |
7368a6c8 | 1113 | |
1114 | #ifdef AFS | |
1115 | /* Try to get AFS tokens for the local cell. */ | |
1116 | if (k_hasafs()) { | |
1117 | char cell[64]; | |
1118 | ||
1119 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1120 | krb_afslog(cell, 0); | |
1121 | ||
1122 | krb_afslog(0, 0); | |
1123 | } | |
1124 | #endif /* AFS */ | |
1125 | ||
1126 | /* Initialize the environment. */ | |
1127 | envsize = 100; | |
1128 | env = xmalloc(envsize * sizeof(char *)); | |
1129 | env[0] = NULL; | |
1130 | ||
3c62e7eb | 1131 | #ifdef HAVE_CYGWIN |
1132 | /* | |
1133 | * The Windows environment contains some setting which are | |
1134 | * important for a running system. They must not be dropped. | |
1135 | */ | |
22d89d24 | 1136 | copy_environment(&env, &envsize); |
3c62e7eb | 1137 | #endif |
1138 | ||
7368a6c8 | 1139 | if (!options.use_login) { |
1140 | /* Set basic environment. */ | |
1141 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1142 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1143 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
2e73a022 | 1144 | #ifdef HAVE_LOGIN_CAP |
1145 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH); | |
1146 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1147 | #else /* HAVE_LOGIN_CAP */ |
1148 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1149 | /* |
1150 | * There's no standard path on Windows. The path contains | |
1151 | * important components pointing to the system directories, | |
1152 | * needed for loading shared libraries. So the path better | |
1153 | * remains intact here. | |
1154 | */ | |
7368a6c8 | 1155 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
22d89d24 | 1156 | # endif /* HAVE_CYGWIN */ |
1157 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1158 | |
1159 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1160 | _PATH_MAILDIR, pw->pw_name); | |
1161 | child_set_env(&env, &envsize, "MAIL", buf); | |
1162 | ||
1163 | /* Normal systems set SHELL by default. */ | |
1164 | child_set_env(&env, &envsize, "SHELL", shell); | |
1165 | } | |
1166 | if (getenv("TZ")) | |
1167 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1168 | ||
1169 | /* Set custom environment options from RSA authentication. */ | |
1170 | while (custom_environment) { | |
1171 | struct envstring *ce = custom_environment; | |
1172 | char *s = ce->s; | |
1173 | int i; | |
1174 | for (i = 0; s[i] != '=' && s[i]; i++); | |
1175 | if (s[i] == '=') { | |
1176 | s[i] = 0; | |
1177 | child_set_env(&env, &envsize, s, s + i + 1); | |
1178 | } | |
1179 | custom_environment = ce->next; | |
1180 | xfree(ce->s); | |
1181 | xfree(ce); | |
1182 | } | |
1183 | ||
1184 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
1185 | get_remote_ipaddr(), get_remote_port(), get_local_port()); | |
1186 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); | |
1187 | ||
1188 | if (ttyname) | |
1189 | child_set_env(&env, &envsize, "SSH_TTY", ttyname); | |
1190 | if (term) | |
1191 | child_set_env(&env, &envsize, "TERM", term); | |
1192 | if (display) | |
1193 | child_set_env(&env, &envsize, "DISPLAY", display); | |
b5e300c2 | 1194 | if (original_command) |
1195 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1196 | original_command); | |
7368a6c8 | 1197 | |
1198 | #ifdef _AIX | |
22d89d24 | 1199 | if ((cp = getenv("AUTHSTATE")) != NULL) |
1200 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1201 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1202 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1203 | read_environment_file(&env, &envsize, "/etc/environment"); | |
7368a6c8 | 1204 | #endif |
1205 | ||
1206 | #ifdef KRB4 | |
1207 | { | |
1208 | extern char *ticket; | |
1209 | ||
1210 | if (ticket) | |
1211 | child_set_env(&env, &envsize, "KRBTKFILE", ticket); | |
1212 | } | |
1213 | #endif /* KRB4 */ | |
1214 | ||
1215 | #ifdef USE_PAM | |
1216 | /* Pull in any environment variables that may have been set by PAM. */ | |
1217 | do_pam_environment(&env, &envsize); | |
1218 | #endif /* USE_PAM */ | |
1219 | ||
7368a6c8 | 1220 | if (xauthfile) |
1221 | child_set_env(&env, &envsize, "XAUTHORITY", xauthfile); | |
1222 | if (auth_get_socket_name() != NULL) | |
1223 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, | |
1224 | auth_get_socket_name()); | |
1225 | ||
1226 | /* read $HOME/.ssh/environment. */ | |
1227 | if (!options.use_login) { | |
71276795 | 1228 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1229 | pw->pw_dir); | |
7368a6c8 | 1230 | read_environment_file(&env, &envsize, buf); |
1231 | } | |
1232 | if (debug_flag) { | |
1233 | /* dump the environment */ | |
1234 | fprintf(stderr, "Environment:\n"); | |
1235 | for (i = 0; env[i]; i++) | |
1236 | fprintf(stderr, " %.200s\n", env[i]); | |
1237 | } | |
2e73a022 | 1238 | /* we have to stash the hostname before we close our socket. */ |
1239 | if (options.use_login) | |
1240 | hostname = get_remote_name_or_ip(); | |
7368a6c8 | 1241 | /* |
1242 | * Close the connection descriptors; note that this is the child, and | |
1243 | * the server will still have the socket open, and it is important | |
1244 | * that we do not shutdown it. Note that the descriptors cannot be | |
1245 | * closed before building the environment, as we call | |
1246 | * get_remote_ipaddr there. | |
1247 | */ | |
1248 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1249 | close(packet_get_connection_in()); | |
1250 | else { | |
1251 | close(packet_get_connection_in()); | |
1252 | close(packet_get_connection_out()); | |
1253 | } | |
1254 | /* | |
1255 | * Close all descriptors related to channels. They will still remain | |
1256 | * open in the parent. | |
1257 | */ | |
1258 | /* XXX better use close-on-exec? -markus */ | |
1259 | channel_close_all(); | |
1260 | ||
1261 | /* | |
1262 | * Close any extra file descriptors. Note that there may still be | |
1263 | * descriptors left by system functions. They will be closed later. | |
1264 | */ | |
1265 | endpwent(); | |
1266 | ||
1267 | /* | |
1268 | * Close any extra open file descriptors so that we don\'t have them | |
1269 | * hanging around in clients. Note that we want to do this after | |
1270 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1271 | * descriptors open. | |
1272 | */ | |
1273 | for (i = 3; i < 64; i++) | |
1274 | close(i); | |
1275 | ||
1276 | /* Change current directory to the user\'s home directory. */ | |
2e73a022 | 1277 | if (chdir(pw->pw_dir) < 0) { |
7368a6c8 | 1278 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", |
1279 | pw->pw_dir, strerror(errno)); | |
2e73a022 | 1280 | #ifdef HAVE_LOGIN_CAP |
1281 | if (login_getcapbool(lc, "requirehome", 0)) | |
1282 | exit(1); | |
1283 | #endif | |
1284 | } | |
7368a6c8 | 1285 | |
1286 | /* | |
1287 | * Must take new environment into use so that .ssh/rc, /etc/sshrc and | |
1288 | * xauth are run in the proper environment. | |
1289 | */ | |
1290 | environ = env; | |
1291 | ||
1292 | /* | |
1293 | * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first | |
1294 | * in this order). | |
1295 | */ | |
1296 | if (!options.use_login) { | |
1297 | if (stat(SSH_USER_RC, &st) >= 0) { | |
1298 | if (debug_flag) | |
30228d7c | 1299 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_USER_RC); |
7368a6c8 | 1300 | |
30228d7c | 1301 | f = popen(_PATH_BSHELL " " SSH_USER_RC, "w"); |
7368a6c8 | 1302 | if (f) { |
1303 | if (auth_proto != NULL && auth_data != NULL) | |
1304 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1305 | pclose(f); | |
1306 | } else | |
1307 | fprintf(stderr, "Could not run %s\n", SSH_USER_RC); | |
1308 | } else if (stat(SSH_SYSTEM_RC, &st) >= 0) { | |
1309 | if (debug_flag) | |
30228d7c | 1310 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_SYSTEM_RC); |
7368a6c8 | 1311 | |
30228d7c | 1312 | f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w"); |
7368a6c8 | 1313 | if (f) { |
1314 | if (auth_proto != NULL && auth_data != NULL) | |
1315 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1316 | pclose(f); | |
1317 | } else | |
1318 | fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC); | |
6fc1e9f3 | 1319 | } else if (options.xauth_location != NULL) { |
7368a6c8 | 1320 | /* Add authority data to .Xauthority if appropriate. */ |
1321 | if (auth_proto != NULL && auth_data != NULL) { | |
29611d9c | 1322 | char *screen = strchr(display, ':'); |
1323 | if (debug_flag) { | |
71276795 | 1324 | fprintf(stderr, |
1325 | "Running %.100s add %.100s %.100s %.100s\n", | |
6fc1e9f3 | 1326 | options.xauth_location, display, |
1327 | auth_proto, auth_data); | |
29611d9c | 1328 | if (screen != NULL) |
71276795 | 1329 | fprintf(stderr, |
1330 | "Adding %.*s/unix%s %s %s\n", | |
14a9a859 | 1331 | (int)(screen-display), display, |
71276795 | 1332 | screen, auth_proto, auth_data); |
29611d9c | 1333 | } |
6fc1e9f3 | 1334 | snprintf(cmd, sizeof cmd, "%s -q -", |
1335 | options.xauth_location); | |
1336 | f = popen(cmd, "w"); | |
7368a6c8 | 1337 | if (f) { |
71276795 | 1338 | fprintf(f, "add %s %s %s\n", display, |
1339 | auth_proto, auth_data); | |
29611d9c | 1340 | if (screen != NULL) |
1341 | fprintf(f, "add %.*s/unix%s %s %s\n", | |
14a9a859 | 1342 | (int)(screen-display), display, |
71276795 | 1343 | screen, auth_proto, auth_data); |
7368a6c8 | 1344 | pclose(f); |
6fc1e9f3 | 1345 | } else { |
1346 | fprintf(stderr, "Could not run %s\n", | |
1347 | cmd); | |
1348 | } | |
7368a6c8 | 1349 | } |
1350 | } | |
7368a6c8 | 1351 | /* Get the last component of the shell name. */ |
1352 | cp = strrchr(shell, '/'); | |
1353 | if (cp) | |
1354 | cp++; | |
1355 | else | |
1356 | cp = shell; | |
1357 | } | |
1358 | /* | |
1359 | * If we have no command, execute the shell. In this case, the shell | |
1360 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1361 | * this is a login shell. | |
1362 | */ | |
1363 | if (!command) { | |
1364 | if (!options.use_login) { | |
1365 | char buf[256]; | |
1366 | ||
1367 | /* | |
1368 | * Check for mail if we have a tty and it was enabled | |
1369 | * in server options. | |
1370 | */ | |
1371 | if (ttyname && options.check_mail) { | |
1372 | char *mailbox; | |
1373 | struct stat mailstat; | |
1374 | mailbox = getenv("MAIL"); | |
1375 | if (mailbox != NULL) { | |
71276795 | 1376 | if (stat(mailbox, &mailstat) != 0 || |
1377 | mailstat.st_size == 0) | |
7368a6c8 | 1378 | printf("No mail.\n"); |
1379 | else if (mailstat.st_mtime < mailstat.st_atime) | |
1380 | printf("You have mail.\n"); | |
1381 | else | |
1382 | printf("You have new mail.\n"); | |
1383 | } | |
1384 | } | |
1385 | /* Start the shell. Set initial character to '-'. */ | |
1386 | buf[0] = '-'; | |
1387 | strncpy(buf + 1, cp, sizeof(buf) - 1); | |
1388 | buf[sizeof(buf) - 1] = 0; | |
1389 | ||
1390 | /* Execute the shell. */ | |
1391 | argv[0] = buf; | |
1392 | argv[1] = NULL; | |
1393 | execve(shell, argv, env); | |
1394 | ||
1395 | /* Executing the shell failed. */ | |
1396 | perror(shell); | |
1397 | exit(1); | |
1398 | ||
1399 | } else { | |
1400 | /* Launch login(1). */ | |
1401 | ||
2e73a022 | 1402 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
c345cf9d | 1403 | "-p", "-f", "--", pw->pw_name, NULL); |
7368a6c8 | 1404 | |
1405 | /* Login couldn't be executed, die. */ | |
1406 | ||
1407 | perror("login"); | |
1408 | exit(1); | |
1409 | } | |
1410 | } | |
1411 | /* | |
1412 | * Execute the command using the user's shell. This uses the -c | |
1413 | * option to execute the command. | |
1414 | */ | |
1415 | argv[0] = (char *) cp; | |
1416 | argv[1] = "-c"; | |
1417 | argv[2] = (char *) command; | |
1418 | argv[3] = NULL; | |
1419 | execve(shell, argv, env); | |
1420 | perror(shell); | |
1421 | exit(1); | |
1422 | } | |
1423 | ||
1424 | Session * | |
1425 | session_new(void) | |
1426 | { | |
1427 | int i; | |
1428 | static int did_init = 0; | |
1429 | if (!did_init) { | |
1430 | debug("session_new: init"); | |
1431 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1432 | sessions[i].used = 0; | |
1433 | sessions[i].self = i; | |
1434 | } | |
c5d85828 | 1435 | num_used_sessions = 0; |
7368a6c8 | 1436 | did_init = 1; |
1437 | } | |
1438 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1439 | Session *s = &sessions[i]; | |
1440 | if (! s->used) { | |
1441 | s->pid = 0; | |
0b242b12 | 1442 | s->extended = 0; |
7368a6c8 | 1443 | s->chanid = -1; |
1444 | s->ptyfd = -1; | |
1445 | s->ttyfd = -1; | |
1446 | s->term = NULL; | |
1447 | s->pw = NULL; | |
1448 | s->display = NULL; | |
1449 | s->screen = 0; | |
1450 | s->auth_data = NULL; | |
1451 | s->auth_proto = NULL; | |
1452 | s->used = 1; | |
0b242b12 | 1453 | s->pw = NULL; |
c5d85828 | 1454 | num_used_sessions++; |
1455 | debug("session_new: session %d (%d used)", i, num_used_sessions); | |
7368a6c8 | 1456 | return s; |
1457 | } | |
1458 | } | |
1459 | return NULL; | |
1460 | } | |
1461 | ||
1462 | void | |
1463 | session_dump(void) | |
1464 | { | |
1465 | int i; | |
1466 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1467 | Session *s = &sessions[i]; | |
1468 | debug("dump: used %d session %d %p channel %d pid %d", | |
1469 | s->used, | |
1470 | s->self, | |
1471 | s, | |
1472 | s->chanid, | |
1473 | s->pid); | |
1474 | } | |
1475 | } | |
1476 | ||
e78a59f5 | 1477 | int |
1478 | session_open(int chanid) | |
1479 | { | |
1480 | Session *s = session_new(); | |
1481 | debug("session_open: channel %d", chanid); | |
1482 | if (s == NULL) { | |
1483 | error("no more sessions"); | |
1484 | return 0; | |
1485 | } | |
e78a59f5 | 1486 | s->pw = auth_get_user(); |
1487 | if (s->pw == NULL) | |
0b242b12 | 1488 | fatal("no user for session %i", s->self); |
1489 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1490 | s->chanid = chanid; | |
e78a59f5 | 1491 | return 1; |
1492 | } | |
1493 | ||
1494 | Session * | |
1495 | session_by_channel(int id) | |
1496 | { | |
1497 | int i; | |
1498 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1499 | Session *s = &sessions[i]; | |
1500 | if (s->used && s->chanid == id) { | |
1501 | debug("session_by_channel: session %d channel %d", i, id); | |
1502 | return s; | |
1503 | } | |
1504 | } | |
1505 | debug("session_by_channel: unknown channel %d", id); | |
1506 | session_dump(); | |
1507 | return NULL; | |
1508 | } | |
1509 | ||
1510 | Session * | |
1511 | session_by_pid(pid_t pid) | |
1512 | { | |
1513 | int i; | |
1514 | debug("session_by_pid: pid %d", pid); | |
1515 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1516 | Session *s = &sessions[i]; | |
1517 | if (s->used && s->pid == pid) | |
1518 | return s; | |
1519 | } | |
1520 | error("session_by_pid: unknown pid %d", pid); | |
1521 | session_dump(); | |
1522 | return NULL; | |
1523 | } | |
1524 | ||
1525 | int | |
1526 | session_window_change_req(Session *s) | |
1527 | { | |
1528 | s->col = packet_get_int(); | |
1529 | s->row = packet_get_int(); | |
1530 | s->xpixel = packet_get_int(); | |
1531 | s->ypixel = packet_get_int(); | |
6ae2364d | 1532 | packet_done(); |
e78a59f5 | 1533 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1534 | return 1; | |
1535 | } | |
1536 | ||
1537 | int | |
1538 | session_pty_req(Session *s) | |
1539 | { | |
1540 | unsigned int len; | |
6ae2364d | 1541 | char *term_modes; /* encoded terminal modes */ |
e78a59f5 | 1542 | |
38c295d6 | 1543 | if (no_pty_flag) |
1544 | return 0; | |
e78a59f5 | 1545 | if (s->ttyfd != -1) |
6ae2364d | 1546 | return 0; |
e78a59f5 | 1547 | s->term = packet_get_string(&len); |
1548 | s->col = packet_get_int(); | |
1549 | s->row = packet_get_int(); | |
1550 | s->xpixel = packet_get_int(); | |
1551 | s->ypixel = packet_get_int(); | |
6ae2364d | 1552 | term_modes = packet_get_string(&len); |
1553 | packet_done(); | |
e78a59f5 | 1554 | |
1555 | if (strcmp(s->term, "") == 0) { | |
1556 | xfree(s->term); | |
1557 | s->term = NULL; | |
1558 | } | |
1559 | /* Allocate a pty and open it. */ | |
1560 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) { | |
1561 | xfree(s->term); | |
1562 | s->term = NULL; | |
1563 | s->ptyfd = -1; | |
1564 | s->ttyfd = -1; | |
1565 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1566 | xfree(term_modes); |
1567 | return 0; | |
e78a59f5 | 1568 | } |
1569 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1570 | /* | |
1571 | * Add a cleanup function to clear the utmp entry and record logout | |
1572 | * time in case we call fatal() (e.g., the connection gets closed). | |
1573 | */ | |
1574 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
1575 | pty_setowner(s->pw, s->tty); | |
1576 | /* Get window size from the packet. */ | |
1577 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1578 | ||
1d1ffb87 | 1579 | session_proctitle(s); |
1580 | ||
35484284 | 1581 | /* XXX parse and set terminal modes */ |
1582 | xfree(term_modes); | |
e78a59f5 | 1583 | return 1; |
1584 | } | |
1585 | ||
0b242b12 | 1586 | int |
1587 | session_subsystem_req(Session *s) | |
1588 | { | |
1589 | unsigned int len; | |
1590 | int success = 0; | |
1591 | char *subsys = packet_get_string(&len); | |
38c295d6 | 1592 | int i; |
0b242b12 | 1593 | |
1594 | packet_done(); | |
1595 | log("subsystem request for %s", subsys); | |
1596 | ||
38c295d6 | 1597 | for (i = 0; i < options.num_subsystems; i++) { |
1598 | if(strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1599 | debug("subsystem: exec() %s", options.subsystem_command[i]); | |
1600 | do_exec_no_pty(s, options.subsystem_command[i], s->pw); | |
1601 | success = 1; | |
1602 | } | |
1603 | } | |
1604 | ||
1605 | if (!success) | |
1606 | log("subsystem request for %s failed, subsystem not found", subsys); | |
1607 | ||
0b242b12 | 1608 | xfree(subsys); |
1609 | return success; | |
1610 | } | |
1611 | ||
1612 | int | |
1613 | session_x11_req(Session *s) | |
1614 | { | |
b5e300c2 | 1615 | int fd; |
089fbbd2 | 1616 | if (no_x11_forwarding_flag) { |
38c295d6 | 1617 | debug("X11 forwarding disabled in user configuration file."); |
1618 | return 0; | |
1619 | } | |
0b242b12 | 1620 | if (!options.x11_forwarding) { |
1621 | debug("X11 forwarding disabled in server configuration file."); | |
1622 | return 0; | |
1623 | } | |
1624 | if (xauthfile != NULL) { | |
1625 | debug("X11 fwd already started."); | |
1626 | return 0; | |
1627 | } | |
1628 | ||
1629 | debug("Received request for X11 forwarding with auth spoofing."); | |
1630 | if (s->display != NULL) | |
1631 | packet_disconnect("Protocol error: X11 display already set."); | |
1632 | ||
1633 | s->single_connection = packet_get_char(); | |
1634 | s->auth_proto = packet_get_string(NULL); | |
1635 | s->auth_data = packet_get_string(NULL); | |
1636 | s->screen = packet_get_int(); | |
1637 | packet_done(); | |
1638 | ||
1639 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
1640 | if (s->display == NULL) { | |
1641 | xfree(s->auth_proto); | |
1642 | xfree(s->auth_data); | |
1643 | return 0; | |
1644 | } | |
1645 | xauthfile = xmalloc(MAXPATHLEN); | |
1646 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
1647 | temporarily_use_uid(s->pw->pw_uid); | |
1648 | if (mkdtemp(xauthfile) == NULL) { | |
1649 | restore_uid(); | |
1650 | error("private X11 dir: mkdtemp %s failed: %s", | |
1651 | xauthfile, strerror(errno)); | |
1652 | xfree(xauthfile); | |
1653 | xauthfile = NULL; | |
1654 | xfree(s->auth_proto); | |
1655 | xfree(s->auth_data); | |
1656 | /* XXXX remove listening channels */ | |
1657 | return 0; | |
1658 | } | |
1659 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 1660 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
1661 | if (fd >= 0) | |
1662 | close(fd); | |
0b242b12 | 1663 | restore_uid(); |
1664 | fatal_add_cleanup(xauthfile_cleanup_proc, s); | |
1665 | return 1; | |
1666 | } | |
1667 | ||
38c295d6 | 1668 | int |
1669 | session_shell_req(Session *s) | |
1670 | { | |
1671 | /* if forced_command == NULL, the shell is execed */ | |
1672 | char *shell = forced_command; | |
1673 | packet_done(); | |
1674 | s->extended = 1; | |
1675 | if (s->ttyfd == -1) | |
1676 | do_exec_no_pty(s, shell, s->pw); | |
1677 | else | |
1678 | do_exec_pty(s, shell, s->pw); | |
1679 | return 1; | |
1680 | } | |
1681 | ||
1682 | int | |
1683 | session_exec_req(Session *s) | |
1684 | { | |
1685 | unsigned int len; | |
1686 | char *command = packet_get_string(&len); | |
1687 | packet_done(); | |
1688 | if (forced_command) { | |
b5e300c2 | 1689 | original_command = command; |
38c295d6 | 1690 | command = forced_command; |
1691 | debug("Forced command '%.500s'", forced_command); | |
1692 | } | |
1693 | s->extended = 1; | |
1694 | if (s->ttyfd == -1) | |
1695 | do_exec_no_pty(s, command, s->pw); | |
1696 | else | |
1697 | do_exec_pty(s, command, s->pw); | |
1698 | if (forced_command == NULL) | |
1699 | xfree(command); | |
1700 | return 1; | |
1701 | } | |
1702 | ||
e78a59f5 | 1703 | void |
1704 | session_input_channel_req(int id, void *arg) | |
1705 | { | |
1706 | unsigned int len; | |
1707 | int reply; | |
1708 | int success = 0; | |
1709 | char *rtype; | |
1710 | Session *s; | |
1711 | Channel *c; | |
1712 | ||
1713 | rtype = packet_get_string(&len); | |
1714 | reply = packet_get_char(); | |
1715 | ||
1716 | s = session_by_channel(id); | |
1717 | if (s == NULL) | |
1718 | fatal("session_input_channel_req: channel %d: no session", id); | |
1719 | c = channel_lookup(id); | |
1720 | if (c == NULL) | |
1721 | fatal("session_input_channel_req: channel %d: bad channel", id); | |
1722 | ||
1723 | debug("session_input_channel_req: session %d channel %d request %s reply %d", | |
1724 | s->self, id, rtype, reply); | |
1725 | ||
1726 | /* | |
1727 | * a session is in LARVAL state until a shell | |
1728 | * or programm is executed | |
1729 | */ | |
1730 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1731 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1732 | success = session_shell_req(s); |
e78a59f5 | 1733 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1734 | success = session_exec_req(s); |
e78a59f5 | 1735 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1736 | success = session_pty_req(s); |
0b242b12 | 1737 | } else if (strcmp(rtype, "x11-req") == 0) { |
1738 | success = session_x11_req(s); | |
1739 | } else if (strcmp(rtype, "subsystem") == 0) { | |
1740 | success = session_subsystem_req(s); | |
e78a59f5 | 1741 | } |
1742 | } | |
1743 | if (strcmp(rtype, "window-change") == 0) { | |
1744 | success = session_window_change_req(s); | |
1745 | } | |
1746 | ||
1747 | if (reply) { | |
1748 | packet_start(success ? | |
1749 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1750 | packet_put_int(c->remote_id); | |
1751 | packet_send(); | |
1752 | } | |
1753 | xfree(rtype); | |
1754 | } | |
1755 | ||
1756 | void | |
1757 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1758 | { | |
1759 | if (!compat20) | |
1760 | fatal("session_set_fds: called for proto != 2.0"); | |
1761 | /* | |
1762 | * now that have a child and a pipe to the child, | |
1763 | * we can activate our channel and register the fd's | |
1764 | */ | |
1765 | if (s->chanid == -1) | |
1766 | fatal("no channel for session %d", s->self); | |
1767 | channel_set_fds(s->chanid, | |
1768 | fdout, fdin, fderr, | |
1769 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ); | |
1770 | } | |
1771 | ||
7368a6c8 | 1772 | void |
1773 | session_pty_cleanup(Session *s) | |
1774 | { | |
1775 | if (s == NULL || s->ttyfd == -1) | |
1776 | return; | |
1777 | ||
1778 | debug("session_pty_cleanup: session %i release %s", s->self, s->tty); | |
1779 | ||
1780 | /* Cancel the cleanup function. */ | |
1781 | fatal_remove_cleanup(pty_cleanup_proc, (void *)s); | |
1782 | ||
1783 | /* Record that the user has logged out. */ | |
1784 | record_logout(s->pid, s->tty); | |
1785 | ||
1786 | /* Release the pseudo-tty. */ | |
1787 | pty_release(s->tty); | |
1788 | ||
1789 | /* | |
1790 | * Close the server side of the socket pairs. We must do this after | |
1791 | * the pty cleanup, so that another process doesn't get this pty | |
1792 | * while we're still cleaning up. | |
1793 | */ | |
1794 | if (close(s->ptymaster) < 0) | |
1795 | error("close(s->ptymaster): %s", strerror(errno)); | |
1796 | } | |
e78a59f5 | 1797 | |
1798 | void | |
1799 | session_exit_message(Session *s, int status) | |
1800 | { | |
1801 | Channel *c; | |
1802 | if (s == NULL) | |
1803 | fatal("session_close: no session"); | |
1804 | c = channel_lookup(s->chanid); | |
1805 | if (c == NULL) | |
1806 | fatal("session_close: session %d: no channel %d", | |
1807 | s->self, s->chanid); | |
1808 | debug("session_exit_message: session %d channel %d pid %d", | |
1809 | s->self, s->chanid, s->pid); | |
1810 | ||
1811 | if (WIFEXITED(status)) { | |
1812 | channel_request_start(s->chanid, | |
1813 | "exit-status", 0); | |
1814 | packet_put_int(WEXITSTATUS(status)); | |
1815 | packet_send(); | |
1816 | } else if (WIFSIGNALED(status)) { | |
1817 | channel_request_start(s->chanid, | |
1818 | "exit-signal", 0); | |
1819 | packet_put_int(WTERMSIG(status)); | |
a64009ad | 1820 | #ifdef WCOREDUMP |
e78a59f5 | 1821 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1822 | #else /* WCOREDUMP */ |
1823 | packet_put_char(0); | |
1824 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1825 | packet_put_cstring(""); |
1826 | packet_put_cstring(""); | |
1827 | packet_send(); | |
1828 | } else { | |
1829 | /* Some weird exit cause. Just exit. */ | |
1830 | packet_disconnect("wait returned status %04x.", status); | |
1831 | } | |
1832 | ||
1833 | /* disconnect channel */ | |
1834 | debug("session_exit_message: release channel %d", s->chanid); | |
1835 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1836 | /* |
1837 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1838 | * interested in data we write. | |
1839 | * Note that we must not call 'chan_read_failed', since there could | |
1840 | * be some more data waiting in the pipe. | |
1841 | */ | |
0b242b12 | 1842 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1843 | chan_write_failed(c); | |
e78a59f5 | 1844 | s->chanid = -1; |
1845 | } | |
1846 | ||
1847 | void | |
1848 | session_free(Session *s) | |
1849 | { | |
1850 | debug("session_free: session %d pid %d", s->self, s->pid); | |
1851 | if (s->term) | |
1852 | xfree(s->term); | |
1853 | if (s->display) | |
1854 | xfree(s->display); | |
1855 | if (s->auth_data) | |
1856 | xfree(s->auth_data); | |
1857 | if (s->auth_proto) | |
1858 | xfree(s->auth_proto); | |
1859 | s->used = 0; | |
1860 | } | |
1861 | ||
1862 | void | |
1863 | session_close(Session *s) | |
1864 | { | |
1865 | session_pty_cleanup(s); | |
1866 | session_free(s); | |
1d1ffb87 | 1867 | session_proctitle(s); |
c5d85828 | 1868 | num_used_sessions--; |
e78a59f5 | 1869 | } |
1870 | ||
1871 | void | |
1872 | session_close_by_pid(pid_t pid, int status) | |
1873 | { | |
1874 | Session *s = session_by_pid(pid); | |
1875 | if (s == NULL) { | |
1876 | debug("session_close_by_pid: no session for pid %d", s->pid); | |
1877 | return; | |
1878 | } | |
1879 | if (s->chanid != -1) | |
1880 | session_exit_message(s, status); | |
1881 | session_close(s); | |
1882 | } | |
1883 | ||
1884 | /* | |
1885 | * this is called when a channel dies before | |
1886 | * the session 'child' itself dies | |
1887 | */ | |
1888 | void | |
1889 | session_close_by_channel(int id, void *arg) | |
1890 | { | |
1891 | Session *s = session_by_channel(id); | |
1892 | if (s == NULL) { | |
1893 | debug("session_close_by_channel: no session for channel %d", id); | |
1894 | return; | |
1895 | } | |
1896 | /* disconnect channel */ | |
1897 | channel_cancel_cleanup(s->chanid); | |
1898 | s->chanid = -1; | |
1899 | ||
1900 | debug("session_close_by_channel: channel %d kill %d", id, s->pid); | |
1901 | if (s->pid == 0) { | |
1902 | /* close session immediately */ | |
1903 | session_close(s); | |
1904 | } else { | |
1905 | /* notify child, delay session cleanup */ | |
f528fdf2 | 1906 | if (s->pid <= 1) |
512ad3c0 | 1907 | fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid); |
1908 | if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0) | |
e78a59f5 | 1909 | error("session_close_by_channel: kill %d: %s", |
1910 | s->pid, strerror(errno)); | |
1911 | } | |
1912 | } | |
1913 | ||
c5d85828 | 1914 | int used_sessions(void) |
1915 | { | |
1916 | return(num_used_sessions); | |
1917 | } | |
1918 | ||
1d1ffb87 | 1919 | char * |
1920 | session_tty_list(void) | |
1921 | { | |
1922 | static char buf[1024]; | |
1923 | int i; | |
1924 | buf[0] = '\0'; | |
1925 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1926 | Session *s = &sessions[i]; | |
1927 | if (s->used && s->ttyfd != -1) { | |
1928 | if (buf[0] != '\0') | |
1929 | strlcat(buf, ",", sizeof buf); | |
1930 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1931 | } | |
1932 | } | |
1933 | if (buf[0] == '\0') | |
1934 | strlcpy(buf, "notty", sizeof buf); | |
1935 | return buf; | |
1936 | } | |
1937 | ||
1938 | void | |
1939 | session_proctitle(Session *s) | |
1940 | { | |
1941 | if (s->pw == NULL) | |
1942 | error("no user for session %d", s->self); | |
1943 | else | |
1944 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
1945 | } | |
1946 | ||
e78a59f5 | 1947 | void |
1948 | do_authenticated2(void) | |
1949 | { | |
0b65b628 | 1950 | #ifdef HAVE_LOGIN_CAP |
2e73a022 | 1951 | struct passwd *pw; |
0b65b628 | 1952 | #endif |
2e73a022 | 1953 | |
e78a59f5 | 1954 | /* |
1955 | * Cancel the alarm we set to limit the time taken for | |
1956 | * authentication. | |
1957 | */ | |
1958 | alarm(0); | |
3f7a7e4a | 1959 | if (startup_pipe != -1) { |
5540ea9b | 1960 | close(startup_pipe); |
3f7a7e4a | 1961 | startup_pipe = -1; |
1962 | } | |
2e73a022 | 1963 | #ifdef HAVE_LOGIN_CAP |
1964 | pw = auth_get_user(); | |
1965 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
1966 | error("unable to get login class"); | |
1967 | return; | |
1968 | } | |
1969 | #endif | |
e78a59f5 | 1970 | server_loop2(); |
34bce9a5 | 1971 | if (xauthfile) |
1972 | xauthfile_cleanup_proc(NULL); | |
e78a59f5 | 1973 | } |