]>
Commit | Line | Data |
---|---|---|
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" | |
33de75a3 | 36 | RCSID("$OpenBSD: session.c,v 1.40 2000/10/15 14:14:01 markus Exp $"); |
7368a6c8 | 37 | |
38 | #include "xmalloc.h" | |
39 | #include "ssh.h" | |
40 | #include "pty.h" | |
41 | #include "packet.h" | |
42 | #include "buffer.h" | |
7368a6c8 | 43 | #include "mpaux.h" |
44 | #include "servconf.h" | |
45 | #include "uidswap.h" | |
46 | #include "compat.h" | |
47 | #include "channels.h" | |
48 | #include "nchan.h" | |
49 | ||
e78a59f5 | 50 | #include "bufaux.h" |
51 | #include "ssh2.h" | |
52 | #include "auth.h" | |
38c295d6 | 53 | #include "auth-options.h" |
e78a59f5 | 54 | |
3206bb3b | 55 | #ifdef WITH_IRIX_PROJECT |
56 | #include <proj.h> | |
57 | #endif /* WITH_IRIX_PROJECT */ | |
58 | ||
089fbbd2 | 59 | #if defined(HAVE_USERSEC_H) |
60 | #include <usersec.h> | |
61 | #endif | |
62 | ||
4d33e531 | 63 | #ifdef HAVE_OSF_SIA |
64 | # include <sia.h> | |
65 | # include <siad.h> | |
66 | #endif | |
67 | ||
3c62e7eb | 68 | #ifdef HAVE_CYGWIN |
69 | #include <windows.h> | |
70 | #include <sys/cygwin.h> | |
71 | #define is_winnt (GetVersion() < 0x80000000) | |
72 | #endif | |
73 | ||
3fcce26c | 74 | /* AIX limits */ |
75 | #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE) | |
2a2cb9e7 | 76 | # define S_UFSIZE_HARD S_UFSIZE "_hard" |
77 | # define S_UCPU_HARD S_UCPU "_hard" | |
78 | # define S_UDATA_HARD S_UDATA "_hard" | |
79 | # define S_USTACK_HARD S_USTACK "_hard" | |
80 | # define S_URSS_HARD S_URSS "_hard" | |
81 | # define S_UCORE_HARD S_UCORE "_hard" | |
82 | # define S_UNOFILE_HARD S_UNOFILE "_hard" | |
3fcce26c | 83 | #endif |
84 | ||
2e73a022 | 85 | #ifdef HAVE_LOGIN_CAP |
86 | #include <login_cap.h> | |
87 | #endif | |
88 | ||
7368a6c8 | 89 | /* types */ |
90 | ||
91 | #define TTYSZ 64 | |
92 | typedef struct Session Session; | |
93 | struct Session { | |
94 | int used; | |
95 | int self; | |
0b242b12 | 96 | int extended; |
7368a6c8 | 97 | struct passwd *pw; |
98 | pid_t pid; | |
99 | /* tty */ | |
100 | char *term; | |
101 | int ptyfd, ttyfd, ptymaster; | |
102 | int row, col, xpixel, ypixel; | |
103 | char tty[TTYSZ]; | |
104 | /* X11 */ | |
105 | char *display; | |
106 | int screen; | |
107 | char *auth_proto; | |
108 | char *auth_data; | |
0b242b12 | 109 | int single_connection; |
7368a6c8 | 110 | /* proto 2 */ |
111 | int chanid; | |
112 | }; | |
113 | ||
114 | /* func */ | |
115 | ||
116 | Session *session_new(void); | |
117 | void session_set_fds(Session *s, int fdin, int fdout, int fderr); | |
118 | void session_pty_cleanup(Session *s); | |
1d1ffb87 | 119 | void session_proctitle(Session *s); |
7368a6c8 | 120 | void do_exec_pty(Session *s, const char *command, struct passwd * pw); |
121 | void do_exec_no_pty(Session *s, const char *command, struct passwd * pw); | |
c345cf9d | 122 | void do_login(Session *s); |
7368a6c8 | 123 | |
124 | void | |
125 | do_child(const char *command, struct passwd * pw, const char *term, | |
126 | const char *display, const char *auth_proto, | |
127 | const char *auth_data, const char *ttyname); | |
128 | ||
129 | /* import */ | |
130 | extern ServerOptions options; | |
3a6cb538 | 131 | #ifdef HAVE___PROGNAME |
7368a6c8 | 132 | extern char *__progname; |
3a6cb538 | 133 | #else /* HAVE___PROGNAME */ |
3fd95d9a | 134 | static const char *__progname = "sshd"; |
3a6cb538 | 135 | #endif /* HAVE___PROGNAME */ |
136 | ||
7368a6c8 | 137 | extern int log_stderr; |
138 | extern int debug_flag; | |
c345cf9d | 139 | extern unsigned int utmp_len; |
7368a6c8 | 140 | |
089fbbd2 | 141 | extern int startup_pipe; |
142 | ||
7368a6c8 | 143 | /* Local Xauthority file. */ |
144 | static char *xauthfile; | |
145 | ||
b5e300c2 | 146 | /* original command from peer. */ |
147 | char *original_command = NULL; | |
148 | ||
7368a6c8 | 149 | /* data */ |
150 | #define MAX_SESSIONS 10 | |
151 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 152 | |
c1ef8333 | 153 | #ifdef WITH_AIXAUTHENTICATE |
154 | /* AIX's lastlogin message, set in auth1.c */ | |
155 | char *aixloginmsg; | |
156 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 157 | |
2e73a022 | 158 | #ifdef HAVE_LOGIN_CAP |
159 | static login_cap_t *lc; | |
160 | #endif | |
161 | ||
7368a6c8 | 162 | /* |
163 | * Remove local Xauthority file. | |
164 | */ | |
165 | void | |
166 | xauthfile_cleanup_proc(void *ignore) | |
167 | { | |
168 | debug("xauthfile_cleanup_proc called"); | |
169 | ||
170 | if (xauthfile != NULL) { | |
171 | char *p; | |
172 | unlink(xauthfile); | |
173 | p = strrchr(xauthfile, '/'); | |
174 | if (p != NULL) { | |
175 | *p = '\0'; | |
176 | rmdir(xauthfile); | |
177 | } | |
178 | xfree(xauthfile); | |
179 | xauthfile = NULL; | |
180 | } | |
181 | } | |
182 | ||
183 | /* | |
184 | * Function to perform cleanup if we get aborted abnormally (e.g., due to a | |
185 | * dropped connection). | |
186 | */ | |
6ae2364d | 187 | void |
7368a6c8 | 188 | pty_cleanup_proc(void *session) |
189 | { | |
190 | Session *s=session; | |
191 | if (s == NULL) | |
192 | fatal("pty_cleanup_proc: no session"); | |
193 | debug("pty_cleanup_proc: %s", s->tty); | |
194 | ||
195 | if (s->pid != 0) { | |
196 | /* Record that the user has logged out. */ | |
197 | record_logout(s->pid, s->tty); | |
198 | } | |
199 | ||
200 | /* Release the pseudo-tty. */ | |
201 | pty_release(s->tty); | |
202 | } | |
203 | ||
204 | /* | |
205 | * Prepares for an interactive session. This is called after the user has | |
206 | * been successfully authenticated. During this message exchange, pseudo | |
207 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
208 | * are requested, etc. | |
209 | */ | |
6ae2364d | 210 | void |
7368a6c8 | 211 | do_authenticated(struct passwd * pw) |
212 | { | |
213 | Session *s; | |
b5e300c2 | 214 | int type, fd; |
7368a6c8 | 215 | int compression_level = 0, enable_compression_after_reply = 0; |
216 | int have_pty = 0; | |
217 | char *command; | |
218 | int n_bytes; | |
219 | int plen; | |
220 | unsigned int proto_len, data_len, dlen; | |
221 | ||
222 | /* | |
223 | * Cancel the alarm we set to limit the time taken for | |
224 | * authentication. | |
225 | */ | |
226 | alarm(0); | |
3f7a7e4a | 227 | if (startup_pipe != -1) { |
5540ea9b | 228 | close(startup_pipe); |
3f7a7e4a | 229 | startup_pipe = -1; |
230 | } | |
7368a6c8 | 231 | |
232 | /* | |
233 | * Inform the channel mechanism that we are the server side and that | |
234 | * the client may request to connect to any port at all. (The user | |
235 | * could do it anyway, and we wouldn\'t know what is permitted except | |
236 | * by the client telling us, so we can equally well trust the client | |
237 | * not to request anything bogus.) | |
238 | */ | |
33de75a3 | 239 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) |
7368a6c8 | 240 | channel_permit_all_opens(); |
241 | ||
242 | s = session_new(); | |
0b242b12 | 243 | s->pw = pw; |
7368a6c8 | 244 | |
97994d32 | 245 | #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD) |
2e73a022 | 246 | if ((lc = login_getclass(pw->pw_class)) == NULL) { |
247 | error("unable to get login class"); | |
248 | return; | |
249 | } | |
250 | #endif | |
251 | ||
7368a6c8 | 252 | /* |
253 | * We stay in this loop until the client requests to execute a shell | |
254 | * or a command. | |
255 | */ | |
256 | for (;;) { | |
257 | int success = 0; | |
258 | ||
259 | /* Get a packet from the client. */ | |
260 | type = packet_read(&plen); | |
261 | ||
262 | /* Process the packet. */ | |
263 | switch (type) { | |
264 | case SSH_CMSG_REQUEST_COMPRESSION: | |
265 | packet_integrity_check(plen, 4, type); | |
266 | compression_level = packet_get_int(); | |
267 | if (compression_level < 1 || compression_level > 9) { | |
268 | packet_send_debug("Received illegal compression level %d.", | |
269 | compression_level); | |
270 | break; | |
271 | } | |
272 | /* Enable compression after we have responded with SUCCESS. */ | |
273 | enable_compression_after_reply = 1; | |
274 | success = 1; | |
275 | break; | |
276 | ||
277 | case SSH_CMSG_REQUEST_PTY: | |
278 | if (no_pty_flag) { | |
279 | debug("Allocating a pty not permitted for this authentication."); | |
280 | break; | |
281 | } | |
282 | if (have_pty) | |
283 | packet_disconnect("Protocol error: you already have a pty."); | |
284 | ||
285 | debug("Allocating pty."); | |
286 | ||
287 | /* Allocate a pty and open it. */ | |
288 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, | |
289 | sizeof(s->tty))) { | |
290 | error("Failed to allocate pty."); | |
291 | break; | |
292 | } | |
293 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
294 | pty_setowner(pw, s->tty); | |
295 | ||
296 | /* Get TERM from the packet. Note that the value may be of arbitrary length. */ | |
297 | s->term = packet_get_string(&dlen); | |
298 | packet_integrity_check(dlen, strlen(s->term), type); | |
299 | /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */ | |
300 | /* Remaining bytes */ | |
301 | n_bytes = plen - (4 + dlen + 4 * 4); | |
302 | ||
303 | if (strcmp(s->term, "") == 0) { | |
304 | xfree(s->term); | |
305 | s->term = NULL; | |
306 | } | |
307 | /* Get window size from the packet. */ | |
308 | s->row = packet_get_int(); | |
309 | s->col = packet_get_int(); | |
310 | s->xpixel = packet_get_int(); | |
311 | s->ypixel = packet_get_int(); | |
312 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
313 | ||
314 | /* Get tty modes from the packet. */ | |
315 | tty_parse_modes(s->ttyfd, &n_bytes); | |
316 | packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type); | |
317 | ||
1d1ffb87 | 318 | session_proctitle(s); |
319 | ||
7368a6c8 | 320 | /* Indicate that we now have a pty. */ |
321 | success = 1; | |
322 | have_pty = 1; | |
323 | break; | |
324 | ||
325 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
326 | if (!options.x11_forwarding) { | |
327 | packet_send_debug("X11 forwarding disabled in server configuration file."); | |
328 | break; | |
329 | } | |
6fc1e9f3 | 330 | if (!options.xauth_location) { |
331 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
332 | break; | |
333 | } | |
7368a6c8 | 334 | if (no_x11_forwarding_flag) { |
335 | packet_send_debug("X11 forwarding not permitted for this authentication."); | |
336 | break; | |
337 | } | |
338 | debug("Received request for X11 forwarding with auth spoofing."); | |
339 | if (s->display != NULL) | |
340 | packet_disconnect("Protocol error: X11 display already set."); | |
341 | ||
342 | s->auth_proto = packet_get_string(&proto_len); | |
343 | s->auth_data = packet_get_string(&data_len); | |
344 | packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type); | |
345 | ||
346 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER) | |
347 | s->screen = packet_get_int(); | |
348 | else | |
349 | s->screen = 0; | |
350 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
351 | ||
352 | if (s->display == NULL) | |
353 | break; | |
354 | ||
355 | /* Setup to always have a local .Xauthority. */ | |
356 | xauthfile = xmalloc(MAXPATHLEN); | |
357 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
358 | temporarily_use_uid(pw->pw_uid); | |
359 | if (mkdtemp(xauthfile) == NULL) { | |
360 | restore_uid(); | |
361 | error("private X11 dir: mkdtemp %s failed: %s", | |
362 | xauthfile, strerror(errno)); | |
363 | xfree(xauthfile); | |
364 | xauthfile = NULL; | |
0b242b12 | 365 | /* XXXX remove listening channels */ |
7368a6c8 | 366 | break; |
367 | } | |
368 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 369 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
370 | if (fd >= 0) | |
371 | close(fd); | |
7368a6c8 | 372 | restore_uid(); |
373 | fatal_add_cleanup(xauthfile_cleanup_proc, NULL); | |
374 | success = 1; | |
375 | break; | |
7368a6c8 | 376 | |
377 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
378 | if (no_agent_forwarding_flag || compat13) { | |
379 | debug("Authentication agent forwarding not permitted for this authentication."); | |
380 | break; | |
381 | } | |
382 | debug("Received authentication agent forwarding request."); | |
6fc1e9f3 | 383 | success = auth_input_request_forwarding(pw); |
7368a6c8 | 384 | break; |
385 | ||
386 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
387 | if (no_port_forwarding_flag) { | |
388 | debug("Port forwarding not permitted for this authentication."); | |
389 | break; | |
390 | } | |
33de75a3 | 391 | if (!options.allow_tcp_forwarding) { |
392 | debug("Port forwarding not permitted."); | |
393 | break; | |
394 | } | |
7368a6c8 | 395 | debug("Received TCP/IP port forwarding request."); |
1d1ffb87 | 396 | channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 397 | success = 1; |
398 | break; | |
399 | ||
400 | case SSH_CMSG_MAX_PACKET_SIZE: | |
401 | if (packet_set_maxsize(packet_get_int()) > 0) | |
402 | success = 1; | |
403 | break; | |
404 | ||
405 | case SSH_CMSG_EXEC_SHELL: | |
406 | case SSH_CMSG_EXEC_CMD: | |
407 | /* Set interactive/non-interactive mode. */ | |
408 | packet_set_interactive(have_pty || s->display != NULL, | |
409 | options.keepalives); | |
410 | ||
411 | if (type == SSH_CMSG_EXEC_CMD) { | |
412 | command = packet_get_string(&dlen); | |
413 | debug("Exec command '%.500s'", command); | |
414 | packet_integrity_check(plen, 4 + dlen, type); | |
415 | } else { | |
416 | command = NULL; | |
417 | packet_integrity_check(plen, 0, type); | |
418 | } | |
419 | if (forced_command != NULL) { | |
b5e300c2 | 420 | original_command = command; |
7368a6c8 | 421 | command = forced_command; |
422 | debug("Forced command '%.500s'", forced_command); | |
423 | } | |
424 | if (have_pty) | |
425 | do_exec_pty(s, command, pw); | |
426 | else | |
427 | do_exec_no_pty(s, command, pw); | |
428 | ||
429 | if (command != NULL) | |
430 | xfree(command); | |
431 | /* Cleanup user's local Xauthority file. */ | |
432 | if (xauthfile) | |
433 | xauthfile_cleanup_proc(NULL); | |
434 | return; | |
435 | ||
436 | default: | |
437 | /* | |
438 | * Any unknown messages in this phase are ignored, | |
439 | * and a failure message is returned. | |
440 | */ | |
441 | log("Unknown packet type received after authentication: %d", type); | |
442 | } | |
443 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
444 | packet_send(); | |
445 | packet_write_wait(); | |
446 | ||
447 | /* Enable compression now that we have replied if appropriate. */ | |
448 | if (enable_compression_after_reply) { | |
449 | enable_compression_after_reply = 0; | |
450 | packet_start_compression(compression_level); | |
451 | } | |
452 | } | |
453 | } | |
454 | ||
455 | /* | |
456 | * This is called to fork and execute a command when we have no tty. This | |
457 | * will call do_child from the child, and server_loop from the parent after | |
458 | * setting up file descriptors and such. | |
459 | */ | |
6ae2364d | 460 | void |
7368a6c8 | 461 | do_exec_no_pty(Session *s, const char *command, struct passwd * pw) |
462 | { | |
463 | int pid; | |
464 | ||
465 | #ifdef USE_PIPES | |
466 | int pin[2], pout[2], perr[2]; | |
467 | /* Allocate pipes for communicating with the program. */ | |
468 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
469 | packet_disconnect("Could not create pipes: %.100s", | |
470 | strerror(errno)); | |
471 | #else /* USE_PIPES */ | |
472 | int inout[2], err[2]; | |
473 | /* Uses socket pairs to communicate with the program. */ | |
474 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
475 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
476 | packet_disconnect("Could not create socket pairs: %.100s", | |
477 | strerror(errno)); | |
478 | #endif /* USE_PIPES */ | |
479 | if (s == NULL) | |
480 | fatal("do_exec_no_pty: no session"); | |
481 | ||
857040fb | 482 | signal(SIGPIPE, SIG_DFL); |
483 | ||
1d1ffb87 | 484 | session_proctitle(s); |
7368a6c8 | 485 | |
486 | #ifdef USE_PAM | |
487 | do_pam_setcred(); | |
488 | #endif /* USE_PAM */ | |
489 | ||
490 | /* Fork the child. */ | |
491 | if ((pid = fork()) == 0) { | |
492 | /* Child. Reinitialize the log since the pid has changed. */ | |
493 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
494 | ||
495 | /* | |
496 | * Create a new session and process group since the 4.4BSD | |
497 | * setlogin() affects the entire process group. | |
498 | */ | |
499 | if (setsid() < 0) | |
500 | error("setsid failed: %.100s", strerror(errno)); | |
501 | ||
502 | #ifdef USE_PIPES | |
503 | /* | |
504 | * Redirect stdin. We close the parent side of the socket | |
505 | * pair, and make the child side the standard input. | |
506 | */ | |
507 | close(pin[1]); | |
508 | if (dup2(pin[0], 0) < 0) | |
509 | perror("dup2 stdin"); | |
510 | close(pin[0]); | |
511 | ||
512 | /* Redirect stdout. */ | |
513 | close(pout[0]); | |
514 | if (dup2(pout[1], 1) < 0) | |
515 | perror("dup2 stdout"); | |
516 | close(pout[1]); | |
517 | ||
518 | /* Redirect stderr. */ | |
519 | close(perr[0]); | |
520 | if (dup2(perr[1], 2) < 0) | |
521 | perror("dup2 stderr"); | |
522 | close(perr[1]); | |
523 | #else /* USE_PIPES */ | |
524 | /* | |
525 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
526 | * use the same socket, as some programs (particularly rdist) | |
527 | * seem to depend on it. | |
528 | */ | |
529 | close(inout[1]); | |
530 | close(err[1]); | |
531 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
532 | perror("dup2 stdin"); | |
533 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
534 | perror("dup2 stdout"); | |
535 | if (dup2(err[0], 2) < 0) /* stderr */ | |
536 | perror("dup2 stderr"); | |
537 | #endif /* USE_PIPES */ | |
538 | ||
539 | /* Do processing for the child (exec command etc). */ | |
540 | do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL); | |
541 | /* NOTREACHED */ | |
542 | } | |
3c62e7eb | 543 | #ifdef HAVE_CYGWIN |
544 | if (is_winnt) | |
545 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
546 | #endif | |
7368a6c8 | 547 | if (pid < 0) |
548 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
549 | s->pid = pid; | |
550 | #ifdef USE_PIPES | |
551 | /* We are the parent. Close the child sides of the pipes. */ | |
552 | close(pin[0]); | |
553 | close(pout[1]); | |
554 | close(perr[1]); | |
555 | ||
e78a59f5 | 556 | if (compat20) { |
0b242b12 | 557 | session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1); |
e78a59f5 | 558 | } else { |
559 | /* Enter the interactive session. */ | |
560 | server_loop(pid, pin[1], pout[0], perr[0]); | |
561 | /* server_loop has closed pin[1], pout[1], and perr[1]. */ | |
562 | } | |
7368a6c8 | 563 | #else /* USE_PIPES */ |
564 | /* We are the parent. Close the child sides of the socket pairs. */ | |
565 | close(inout[0]); | |
566 | close(err[0]); | |
567 | ||
568 | /* | |
569 | * Enter the interactive session. Note: server_loop must be able to | |
570 | * handle the case that fdin and fdout are the same. | |
571 | */ | |
e78a59f5 | 572 | if (compat20) { |
0b242b12 | 573 | session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1); |
e78a59f5 | 574 | } else { |
575 | server_loop(pid, inout[1], inout[1], err[1]); | |
576 | /* server_loop has closed inout[1] and err[1]. */ | |
577 | } | |
7368a6c8 | 578 | #endif /* USE_PIPES */ |
579 | } | |
580 | ||
581 | /* | |
582 | * This is called to fork and execute a command when we have a tty. This | |
583 | * will call do_child from the child, and server_loop from the parent after | |
584 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
585 | * lastlog, and other such operations. | |
586 | */ | |
6ae2364d | 587 | void |
7368a6c8 | 588 | do_exec_pty(Session *s, const char *command, struct passwd * pw) |
589 | { | |
7368a6c8 | 590 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 591 | pid_t pid; |
7368a6c8 | 592 | |
593 | if (s == NULL) | |
594 | fatal("do_exec_pty: no session"); | |
595 | ptyfd = s->ptyfd; | |
596 | ttyfd = s->ttyfd; | |
597 | ||
7368a6c8 | 598 | #ifdef USE_PAM |
599 | do_pam_session(pw->pw_name, s->tty); | |
600 | do_pam_setcred(); | |
601 | #endif /* USE_PAM */ | |
602 | ||
603 | /* Fork the child. */ | |
604 | if ((pid = fork()) == 0) { | |
c345cf9d | 605 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 606 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
607 | ||
608 | /* Close the master side of the pseudo tty. */ | |
609 | close(ptyfd); | |
610 | ||
611 | /* Make the pseudo tty our controlling tty. */ | |
612 | pty_make_controlling_tty(&ttyfd, s->tty); | |
613 | ||
614 | /* Redirect stdin from the pseudo tty. */ | |
615 | if (dup2(ttyfd, fileno(stdin)) < 0) | |
616 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
617 | ||
618 | /* Redirect stdout to the pseudo tty. */ | |
619 | if (dup2(ttyfd, fileno(stdout)) < 0) | |
620 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
621 | ||
622 | /* Redirect stderr to the pseudo tty. */ | |
623 | if (dup2(ttyfd, fileno(stderr)) < 0) | |
624 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
625 | ||
626 | /* Close the extra descriptor for the pseudo tty. */ | |
627 | close(ttyfd); | |
628 | ||
c345cf9d | 629 | /* record login, etc. similar to login(1) */ |
630 | if (command == NULL && !options.use_login) | |
631 | do_login(s); | |
7368a6c8 | 632 | |
7368a6c8 | 633 | /* Do common processing for the child, such as execing the command. */ |
71276795 | 634 | do_child(command, pw, s->term, s->display, s->auth_proto, |
635 | s->auth_data, s->tty); | |
7368a6c8 | 636 | /* NOTREACHED */ |
637 | } | |
3c62e7eb | 638 | #ifdef HAVE_CYGWIN |
639 | if (is_winnt) | |
640 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
641 | #endif | |
7368a6c8 | 642 | if (pid < 0) |
643 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
644 | s->pid = pid; | |
645 | ||
646 | /* Parent. Close the slave side of the pseudo tty. */ | |
647 | close(ttyfd); | |
648 | ||
649 | /* | |
650 | * Create another descriptor of the pty master side for use as the | |
651 | * standard input. We could use the original descriptor, but this | |
652 | * simplifies code in server_loop. The descriptor is bidirectional. | |
653 | */ | |
654 | fdout = dup(ptyfd); | |
655 | if (fdout < 0) | |
656 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
657 | ||
658 | /* we keep a reference to the pty master */ | |
659 | ptymaster = dup(ptyfd); | |
660 | if (ptymaster < 0) | |
661 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
662 | s->ptymaster = ptymaster; | |
663 | ||
664 | /* Enter interactive session. */ | |
e78a59f5 | 665 | if (compat20) { |
666 | session_set_fds(s, ptyfd, fdout, -1); | |
667 | } else { | |
668 | server_loop(pid, ptyfd, fdout, -1); | |
669 | /* server_loop _has_ closed ptyfd and fdout. */ | |
670 | session_pty_cleanup(s); | |
671 | } | |
7368a6c8 | 672 | } |
673 | ||
c345cf9d | 674 | const char * |
675 | get_remote_name_or_ip(void) | |
676 | { | |
677 | static const char *remote = ""; | |
678 | if (utmp_len > 0) | |
679 | remote = get_canonical_hostname(); | |
680 | if (utmp_len == 0 || strlen(remote) > utmp_len) | |
681 | remote = get_remote_ipaddr(); | |
682 | return remote; | |
683 | } | |
684 | ||
685 | /* administrative, login(1)-like work */ | |
686 | void | |
687 | do_login(Session *s) | |
688 | { | |
689 | FILE *f; | |
690 | char *time_string; | |
691 | char buf[256]; | |
b5e300c2 | 692 | char hostname[MAXHOSTNAMELEN]; |
c345cf9d | 693 | socklen_t fromlen; |
694 | struct sockaddr_storage from; | |
695 | struct stat st; | |
696 | time_t last_login_time; | |
697 | struct passwd * pw = s->pw; | |
698 | pid_t pid = getpid(); | |
699 | ||
700 | /* | |
701 | * Get IP address of client. If the connection is not a socket, let | |
702 | * the address be 0.0.0.0. | |
703 | */ | |
704 | memset(&from, 0, sizeof(from)); | |
705 | if (packet_connection_is_on_socket()) { | |
706 | fromlen = sizeof(from); | |
707 | if (getpeername(packet_get_connection_in(), | |
708 | (struct sockaddr *) & from, &fromlen) < 0) { | |
709 | debug("getpeername: %.100s", strerror(errno)); | |
710 | fatal_cleanup(); | |
711 | } | |
712 | } | |
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 | ||
2919e060 | 723 | #ifdef USE_PAM |
724 | /* | |
725 | * If password change is needed, do it now. | |
726 | * This needs to occur before the ~/.hushlogin check. | |
727 | */ | |
728 | if (pam_password_change_required()) { | |
729 | print_pam_messages(); | |
730 | do_pam_chauthtok(); | |
731 | } | |
732 | #endif | |
733 | ||
c345cf9d | 734 | /* Done if .hushlogin exists. */ |
735 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
2e73a022 | 736 | #ifdef HAVE_LOGIN_CAP |
737 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
738 | #else | |
c345cf9d | 739 | if (stat(buf, &st) >= 0) |
2e73a022 | 740 | #endif |
c345cf9d | 741 | return; |
742 | ||
743 | #ifdef USE_PAM | |
2919e060 | 744 | if (!pam_password_change_required()) |
745 | print_pam_messages(); | |
c345cf9d | 746 | #endif /* USE_PAM */ |
747 | #ifdef WITH_AIXAUTHENTICATE | |
748 | if (aixloginmsg && *aixloginmsg) | |
749 | printf("%s\n", aixloginmsg); | |
750 | #endif /* WITH_AIXAUTHENTICATE */ | |
751 | ||
c345cf9d | 752 | if (last_login_time != 0) { |
753 | time_string = ctime(&last_login_time); | |
754 | if (strchr(time_string, '\n')) | |
755 | *strchr(time_string, '\n') = 0; | |
f478712e | 756 | if (strcmp(hostname, "") == 0) |
c345cf9d | 757 | printf("Last login: %s\r\n", time_string); |
758 | else | |
bcbf86ec | 759 | printf("Last login: %s from %s\r\n", time_string, hostname); |
c345cf9d | 760 | } |
761 | if (options.print_motd) { | |
2e73a022 | 762 | #ifdef HAVE_LOGIN_CAP |
763 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
764 | "/etc/motd"), "r"); | |
765 | #else | |
c345cf9d | 766 | f = fopen("/etc/motd", "r"); |
2e73a022 | 767 | #endif |
c345cf9d | 768 | if (f) { |
769 | while (fgets(buf, sizeof(buf), f)) | |
770 | fputs(buf, stdout); | |
771 | fclose(f); | |
772 | } | |
773 | } | |
774 | } | |
775 | ||
7368a6c8 | 776 | /* |
777 | * Sets the value of the given variable in the environment. If the variable | |
778 | * already exists, its value is overriden. | |
779 | */ | |
6ae2364d | 780 | void |
7368a6c8 | 781 | child_set_env(char ***envp, unsigned int *envsizep, const char *name, |
782 | const char *value) | |
783 | { | |
784 | unsigned int i, namelen; | |
785 | char **env; | |
786 | ||
787 | /* | |
788 | * Find the slot where the value should be stored. If the variable | |
789 | * already exists, we reuse the slot; otherwise we append a new slot | |
790 | * at the end of the array, expanding if necessary. | |
791 | */ | |
792 | env = *envp; | |
793 | namelen = strlen(name); | |
794 | for (i = 0; env[i]; i++) | |
795 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
796 | break; | |
797 | if (env[i]) { | |
798 | /* Reuse the slot. */ | |
799 | xfree(env[i]); | |
800 | } else { | |
801 | /* New variable. Expand if necessary. */ | |
802 | if (i >= (*envsizep) - 1) { | |
803 | (*envsizep) += 50; | |
804 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
805 | } | |
806 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
807 | env[i + 1] = NULL; | |
808 | } | |
809 | ||
810 | /* Allocate space and format the variable in the appropriate slot. */ | |
811 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
812 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
813 | } | |
814 | ||
815 | /* | |
816 | * Reads environment variables from the given file and adds/overrides them | |
817 | * into the environment. If the file does not exist, this does nothing. | |
818 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
819 | * and assignments of the form name=value. No other forms are allowed. | |
820 | */ | |
6ae2364d | 821 | void |
7368a6c8 | 822 | read_environment_file(char ***env, unsigned int *envsize, |
823 | const char *filename) | |
824 | { | |
825 | FILE *f; | |
826 | char buf[4096]; | |
827 | char *cp, *value; | |
828 | ||
829 | f = fopen(filename, "r"); | |
830 | if (!f) | |
831 | return; | |
832 | ||
833 | while (fgets(buf, sizeof(buf), f)) { | |
834 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
835 | ; | |
836 | if (!*cp || *cp == '#' || *cp == '\n') | |
837 | continue; | |
838 | if (strchr(cp, '\n')) | |
839 | *strchr(cp, '\n') = '\0'; | |
840 | value = strchr(cp, '='); | |
841 | if (value == NULL) { | |
842 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
843 | continue; | |
844 | } | |
71276795 | 845 | /* |
846 | * Replace the equals sign by nul, and advance value to | |
847 | * the value string. | |
848 | */ | |
7368a6c8 | 849 | *value = '\0'; |
850 | value++; | |
851 | child_set_env(env, envsize, cp, value); | |
852 | } | |
853 | fclose(f); | |
854 | } | |
855 | ||
856 | #ifdef USE_PAM | |
857 | /* | |
858 | * Sets any environment variables which have been specified by PAM | |
859 | */ | |
860 | void do_pam_environment(char ***env, int *envsize) | |
861 | { | |
862 | char *equals, var_name[512], var_val[512]; | |
863 | char **pam_env; | |
864 | int i; | |
865 | ||
866 | if ((pam_env = fetch_pam_environment()) == NULL) | |
867 | return; | |
868 | ||
869 | for(i = 0; pam_env[i] != NULL; i++) { | |
870 | if ((equals = strstr(pam_env[i], "=")) == NULL) | |
871 | continue; | |
872 | ||
873 | if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) { | |
874 | memset(var_name, '\0', sizeof(var_name)); | |
875 | memset(var_val, '\0', sizeof(var_val)); | |
876 | ||
877 | strncpy(var_name, pam_env[i], equals - pam_env[i]); | |
878 | strcpy(var_val, equals + 1); | |
879 | ||
22d89d24 | 880 | debug3("PAM environment: %s=%s", var_name, var_val); |
7368a6c8 | 881 | |
882 | child_set_env(env, envsize, var_name, var_val); | |
883 | } | |
884 | } | |
885 | } | |
886 | #endif /* USE_PAM */ | |
887 | ||
22d89d24 | 888 | |
889 | #ifdef HAVE_CYGWIN | |
890 | void copy_environment(char ***env, int *envsize) | |
891 | { | |
892 | char *equals, var_name[512], var_val[512]; | |
893 | int i; | |
894 | ||
895 | for(i = 0; environ[i] != NULL; i++) { | |
896 | if ((equals = strstr(environ[i], "=")) == NULL) | |
897 | continue; | |
898 | ||
899 | if (strlen(environ[i]) < (sizeof(var_name) - 1)) { | |
900 | memset(var_name, '\0', sizeof(var_name)); | |
901 | memset(var_val, '\0', sizeof(var_val)); | |
902 | ||
903 | strncpy(var_name, environ[i], equals - environ[i]); | |
904 | strcpy(var_val, equals + 1); | |
905 | ||
906 | debug3("Copy environment: %s=%s", var_name, var_val); | |
907 | ||
908 | child_set_env(env, envsize, var_name, var_val); | |
909 | } | |
910 | } | |
911 | } | |
912 | #endif | |
913 | ||
5fa45897 | 914 | #if defined(HAVE_GETUSERATTR) |
915 | /* | |
916 | * AIX-specific login initialisation | |
917 | */ | |
918 | void set_limit(char *user, char *soft, char *hard, int resource, int mult) | |
919 | { | |
920 | struct rlimit rlim; | |
56118702 | 921 | int slim, hlim; |
5fa45897 | 922 | |
923 | getrlimit(resource, &rlim); | |
924 | ||
56118702 | 925 | slim = 0; |
926 | if (getuserattr(user, soft, &slim, SEC_INT) != -1) { | |
927 | if (slim < 0) { | |
928 | rlim.rlim_cur = RLIM_INFINITY; | |
929 | } else if (slim != 0) { | |
930 | /* See the wackiness below */ | |
931 | if (rlim.rlim_cur == slim * mult) | |
932 | slim = 0; | |
933 | else | |
934 | rlim.rlim_cur = slim * mult; | |
935 | } | |
936 | } | |
5fa45897 | 937 | |
56118702 | 938 | hlim = 0; |
939 | if (getuserattr(user, hard, &hlim, SEC_INT) != -1) { | |
940 | if (hlim < 0) { | |
941 | rlim.rlim_max = RLIM_INFINITY; | |
942 | } else if (hlim != 0) { | |
943 | rlim.rlim_max = hlim * mult; | |
944 | } | |
945 | } | |
5fa45897 | 946 | |
56118702 | 947 | /* |
948 | * XXX For cpu and fsize the soft limit is set to the hard limit | |
949 | * if the hard limit is left at its default value and the soft limit | |
950 | * is changed from its default value, either by requesting it | |
951 | * (slim == 0) or by setting it to the current default. At least | |
952 | * that's how rlogind does it. If you're confused you're not alone. | |
953 | * Bug or feature? AIX 4.3.1.2 | |
954 | */ | |
955 | if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu")) | |
956 | && hlim == 0 && slim != 0) | |
957 | rlim.rlim_max = rlim.rlim_cur; | |
958 | /* A specified hard limit limits the soft limit */ | |
959 | else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max) | |
960 | rlim.rlim_cur = rlim.rlim_max; | |
961 | /* A soft limit can increase a hard limit */ | |
962 | else if (rlim.rlim_cur > rlim.rlim_max) | |
5fa45897 | 963 | rlim.rlim_max = rlim.rlim_cur; |
964 | ||
965 | if (setrlimit(resource, &rlim) != 0) | |
56118702 | 966 | error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno)); |
5fa45897 | 967 | } |
968 | ||
969 | void set_limits_from_userattr(char *user) | |
970 | { | |
971 | int mask; | |
972 | char buf[16]; | |
973 | ||
974 | set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512); | |
975 | set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1); | |
976 | set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512); | |
977 | set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512); | |
978 | set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512); | |
979 | set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512); | |
980 | #if defined(S_UNOFILE) | |
981 | set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1); | |
982 | #endif | |
983 | ||
984 | if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) { | |
985 | /* Convert decimal to octal */ | |
986 | (void) snprintf(buf, sizeof(buf), "%d", mask); | |
987 | if (sscanf(buf, "%o", &mask) == 1) | |
988 | umask(mask); | |
989 | } | |
990 | } | |
991 | #endif /* defined(HAVE_GETUSERATTR) */ | |
992 | ||
7368a6c8 | 993 | /* |
994 | * Performs common processing for the child, such as setting up the | |
995 | * environment, closing extra file descriptors, setting the user and group | |
996 | * ids, and executing the command or shell. | |
997 | */ | |
6ae2364d | 998 | void |
7368a6c8 | 999 | do_child(const char *command, struct passwd * pw, const char *term, |
1000 | const char *display, const char *auth_proto, | |
1001 | const char *auth_data, const char *ttyname) | |
1002 | { | |
b5e300c2 | 1003 | const char *shell, *hostname = NULL, *cp = NULL; |
7368a6c8 | 1004 | char buf[256]; |
6fc1e9f3 | 1005 | char cmd[1024]; |
2e73a022 | 1006 | FILE *f = NULL; |
7368a6c8 | 1007 | unsigned int envsize, i; |
1008 | char **env; | |
1009 | extern char **environ; | |
1010 | struct stat st; | |
1011 | char *argv[10]; | |
3206bb3b | 1012 | #ifdef WITH_IRIX_PROJECT |
1013 | prid_t projid; | |
1014 | #endif /* WITH_IRIX_PROJECT */ | |
7368a6c8 | 1015 | |
fa649821 | 1016 | /* login(1) is only called if we execute the login shell */ |
1017 | if (options.use_login && command != NULL) | |
1018 | options.use_login = 0; | |
1019 | ||
7368a6c8 | 1020 | #ifndef USE_PAM /* pam_nologin handles this */ |
2e73a022 | 1021 | if (!options.use_login) { |
1022 | # ifdef HAVE_LOGIN_CAP | |
1023 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1024 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1025 | _PATH_NOLOGIN), "r"); | |
1026 | # else /* HAVE_LOGIN_CAP */ | |
1027 | if (pw->pw_uid) | |
1028 | f = fopen(_PATH_NOLOGIN, "r"); | |
1029 | # endif /* HAVE_LOGIN_CAP */ | |
1030 | if (f) { | |
1031 | /* /etc/nologin exists. Print its contents and exit. */ | |
1032 | while (fgets(buf, sizeof(buf), f)) | |
1033 | fputs(buf, stderr); | |
1034 | fclose(f); | |
7368a6c8 | 1035 | exit(254); |
2e73a022 | 1036 | } |
7368a6c8 | 1037 | } |
1038 | #endif /* USE_PAM */ | |
1039 | ||
2e73a022 | 1040 | /* Set login name, uid, gid, and groups. */ |
7368a6c8 | 1041 | /* Login(1) does this as well, and it needs uid 0 for the "-h" |
1042 | switch, so we let login(1) to this for us. */ | |
1043 | if (!options.use_login) { | |
4d33e531 | 1044 | #ifdef HAVE_OSF_SIA |
1045 | extern char **saved_argv; | |
1046 | extern int saved_argc; | |
1047 | char *host = get_canonical_hostname (); | |
1048 | ||
1049 | if (sia_become_user(NULL, saved_argc, saved_argv, host, | |
1050 | pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) != | |
1051 | SIASUCCESS) { | |
1052 | perror("sia_become_user"); | |
1053 | exit(1); | |
1054 | } | |
1055 | if (setreuid(geteuid(), geteuid()) < 0) { | |
1056 | perror("setreuid"); | |
1057 | exit(1); | |
1058 | } | |
1059 | #else /* HAVE_OSF_SIA */ | |
3c62e7eb | 1060 | #ifdef HAVE_CYGWIN |
1061 | if (is_winnt) { | |
1062 | #else | |
7368a6c8 | 1063 | if (getuid() == 0 || geteuid() == 0) { |
3c62e7eb | 1064 | #endif |
2e73a022 | 1065 | # ifdef HAVE_GETUSERATTR |
5fa45897 | 1066 | set_limits_from_userattr(pw->pw_name); |
2e73a022 | 1067 | # endif /* HAVE_GETUSERATTR */ |
1068 | # ifdef HAVE_LOGIN_CAP | |
1069 | if (setusercontext(lc, pw, pw->pw_uid, | |
1070 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1071 | perror("unable to set user context"); | |
1072 | exit(1); | |
1073 | } | |
1074 | # else /* HAVE_LOGIN_CAP */ | |
1075 | if (setlogin(pw->pw_name) < 0) | |
1076 | error("setlogin failed: %s", strerror(errno)); | |
7368a6c8 | 1077 | if (setgid(pw->pw_gid) < 0) { |
1078 | perror("setgid"); | |
1079 | exit(1); | |
1080 | } | |
1081 | /* Initialize the group list. */ | |
1082 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1083 | perror("initgroups"); | |
1084 | exit(1); | |
1085 | } | |
1086 | endgrent(); | |
2e73a022 | 1087 | # ifdef WITH_IRIX_ARRAY |
3206bb3b | 1088 | /* initialize array session */ |
1089 | if (newarraysess() != 0) | |
1090 | fatal("Failed to set up new array session: %.100s", | |
1091 | strerror(errno)); | |
2e73a022 | 1092 | # endif /* WITH_IRIX_ARRAY */ |
1093 | # ifdef WITH_IRIX_PROJECT | |
3206bb3b | 1094 | /* initialize irix project info */ |
1095 | if ((projid = getdfltprojuser(pw->pw_name)) == -1) { | |
1096 | debug("Failed to get project id, using projid 0"); | |
1097 | projid = 0; | |
1098 | } | |
3206bb3b | 1099 | if (setprid(projid)) |
1100 | fatal("Failed to initialize project %d for %s: %.100s", | |
1101 | (int)projid, pw->pw_name, strerror(errno)); | |
2e73a022 | 1102 | # endif /* WITH_IRIX_PROJECT */ |
7368a6c8 | 1103 | /* Permanently switch to the desired uid. */ |
1104 | permanently_set_uid(pw->pw_uid); | |
2e73a022 | 1105 | # endif /* HAVE_LOGIN_CAP */ |
7368a6c8 | 1106 | } |
2e73a022 | 1107 | #endif /* HAVE_OSF_SIA */ |
1108 | ||
3c62e7eb | 1109 | #ifdef HAVE_CYGWIN |
1110 | if (is_winnt) | |
1111 | #endif | |
7368a6c8 | 1112 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
14a9a859 | 1113 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
7368a6c8 | 1114 | } |
1115 | /* | |
1116 | * Get the shell from the password data. An empty shell field is | |
1117 | * legal, and means /bin/sh. | |
1118 | */ | |
1119 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
2e73a022 | 1120 | #ifdef HAVE_LOGIN_CAP |
1121 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1122 | #endif | |
7368a6c8 | 1123 | |
1124 | #ifdef AFS | |
1125 | /* Try to get AFS tokens for the local cell. */ | |
1126 | if (k_hasafs()) { | |
1127 | char cell[64]; | |
1128 | ||
1129 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1130 | krb_afslog(cell, 0); | |
1131 | ||
1132 | krb_afslog(0, 0); | |
1133 | } | |
1134 | #endif /* AFS */ | |
1135 | ||
1136 | /* Initialize the environment. */ | |
1137 | envsize = 100; | |
1138 | env = xmalloc(envsize * sizeof(char *)); | |
1139 | env[0] = NULL; | |
1140 | ||
3c62e7eb | 1141 | #ifdef HAVE_CYGWIN |
1142 | /* | |
1143 | * The Windows environment contains some setting which are | |
1144 | * important for a running system. They must not be dropped. | |
1145 | */ | |
22d89d24 | 1146 | copy_environment(&env, &envsize); |
3c62e7eb | 1147 | #endif |
1148 | ||
7368a6c8 | 1149 | if (!options.use_login) { |
1150 | /* Set basic environment. */ | |
1151 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1152 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1153 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
2e73a022 | 1154 | #ifdef HAVE_LOGIN_CAP |
1155 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH); | |
1156 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1157 | #else /* HAVE_LOGIN_CAP */ |
1158 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1159 | /* |
1160 | * There's no standard path on Windows. The path contains | |
1161 | * important components pointing to the system directories, | |
1162 | * needed for loading shared libraries. So the path better | |
1163 | * remains intact here. | |
1164 | */ | |
7368a6c8 | 1165 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
22d89d24 | 1166 | # endif /* HAVE_CYGWIN */ |
1167 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1168 | |
1169 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1170 | _PATH_MAILDIR, pw->pw_name); | |
1171 | child_set_env(&env, &envsize, "MAIL", buf); | |
1172 | ||
1173 | /* Normal systems set SHELL by default. */ | |
1174 | child_set_env(&env, &envsize, "SHELL", shell); | |
1175 | } | |
1176 | if (getenv("TZ")) | |
1177 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1178 | ||
1179 | /* Set custom environment options from RSA authentication. */ | |
1180 | while (custom_environment) { | |
1181 | struct envstring *ce = custom_environment; | |
1182 | char *s = ce->s; | |
1183 | int i; | |
1184 | for (i = 0; s[i] != '=' && s[i]; i++); | |
1185 | if (s[i] == '=') { | |
1186 | s[i] = 0; | |
1187 | child_set_env(&env, &envsize, s, s + i + 1); | |
1188 | } | |
1189 | custom_environment = ce->next; | |
1190 | xfree(ce->s); | |
1191 | xfree(ce); | |
1192 | } | |
1193 | ||
1194 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
1195 | get_remote_ipaddr(), get_remote_port(), get_local_port()); | |
1196 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); | |
1197 | ||
1198 | if (ttyname) | |
1199 | child_set_env(&env, &envsize, "SSH_TTY", ttyname); | |
1200 | if (term) | |
1201 | child_set_env(&env, &envsize, "TERM", term); | |
1202 | if (display) | |
1203 | child_set_env(&env, &envsize, "DISPLAY", display); | |
b5e300c2 | 1204 | if (original_command) |
1205 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1206 | original_command); | |
7368a6c8 | 1207 | |
1208 | #ifdef _AIX | |
22d89d24 | 1209 | if ((cp = getenv("AUTHSTATE")) != NULL) |
1210 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1211 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1212 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1213 | read_environment_file(&env, &envsize, "/etc/environment"); | |
7368a6c8 | 1214 | #endif |
1215 | ||
1216 | #ifdef KRB4 | |
1217 | { | |
1218 | extern char *ticket; | |
1219 | ||
1220 | if (ticket) | |
1221 | child_set_env(&env, &envsize, "KRBTKFILE", ticket); | |
1222 | } | |
1223 | #endif /* KRB4 */ | |
1224 | ||
1225 | #ifdef USE_PAM | |
1226 | /* Pull in any environment variables that may have been set by PAM. */ | |
1227 | do_pam_environment(&env, &envsize); | |
1228 | #endif /* USE_PAM */ | |
1229 | ||
7368a6c8 | 1230 | if (xauthfile) |
1231 | child_set_env(&env, &envsize, "XAUTHORITY", xauthfile); | |
1232 | if (auth_get_socket_name() != NULL) | |
1233 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, | |
1234 | auth_get_socket_name()); | |
1235 | ||
1236 | /* read $HOME/.ssh/environment. */ | |
1237 | if (!options.use_login) { | |
71276795 | 1238 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1239 | pw->pw_dir); | |
7368a6c8 | 1240 | read_environment_file(&env, &envsize, buf); |
1241 | } | |
1242 | if (debug_flag) { | |
1243 | /* dump the environment */ | |
1244 | fprintf(stderr, "Environment:\n"); | |
1245 | for (i = 0; env[i]; i++) | |
1246 | fprintf(stderr, " %.200s\n", env[i]); | |
1247 | } | |
2e73a022 | 1248 | /* we have to stash the hostname before we close our socket. */ |
1249 | if (options.use_login) | |
1250 | hostname = get_remote_name_or_ip(); | |
7368a6c8 | 1251 | /* |
1252 | * Close the connection descriptors; note that this is the child, and | |
1253 | * the server will still have the socket open, and it is important | |
1254 | * that we do not shutdown it. Note that the descriptors cannot be | |
1255 | * closed before building the environment, as we call | |
1256 | * get_remote_ipaddr there. | |
1257 | */ | |
1258 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1259 | close(packet_get_connection_in()); | |
1260 | else { | |
1261 | close(packet_get_connection_in()); | |
1262 | close(packet_get_connection_out()); | |
1263 | } | |
1264 | /* | |
1265 | * Close all descriptors related to channels. They will still remain | |
1266 | * open in the parent. | |
1267 | */ | |
1268 | /* XXX better use close-on-exec? -markus */ | |
1269 | channel_close_all(); | |
1270 | ||
1271 | /* | |
1272 | * Close any extra file descriptors. Note that there may still be | |
1273 | * descriptors left by system functions. They will be closed later. | |
1274 | */ | |
1275 | endpwent(); | |
1276 | ||
1277 | /* | |
1278 | * Close any extra open file descriptors so that we don\'t have them | |
1279 | * hanging around in clients. Note that we want to do this after | |
1280 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1281 | * descriptors open. | |
1282 | */ | |
1283 | for (i = 3; i < 64; i++) | |
1284 | close(i); | |
1285 | ||
1286 | /* Change current directory to the user\'s home directory. */ | |
2e73a022 | 1287 | if (chdir(pw->pw_dir) < 0) { |
7368a6c8 | 1288 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", |
1289 | pw->pw_dir, strerror(errno)); | |
2e73a022 | 1290 | #ifdef HAVE_LOGIN_CAP |
1291 | if (login_getcapbool(lc, "requirehome", 0)) | |
1292 | exit(1); | |
1293 | #endif | |
1294 | } | |
7368a6c8 | 1295 | |
1296 | /* | |
1297 | * Must take new environment into use so that .ssh/rc, /etc/sshrc and | |
1298 | * xauth are run in the proper environment. | |
1299 | */ | |
1300 | environ = env; | |
1301 | ||
1302 | /* | |
1303 | * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first | |
1304 | * in this order). | |
1305 | */ | |
1306 | if (!options.use_login) { | |
1307 | if (stat(SSH_USER_RC, &st) >= 0) { | |
1308 | if (debug_flag) | |
30228d7c | 1309 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_USER_RC); |
7368a6c8 | 1310 | |
30228d7c | 1311 | f = popen(_PATH_BSHELL " " SSH_USER_RC, "w"); |
7368a6c8 | 1312 | if (f) { |
1313 | if (auth_proto != NULL && auth_data != NULL) | |
1314 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1315 | pclose(f); | |
1316 | } else | |
1317 | fprintf(stderr, "Could not run %s\n", SSH_USER_RC); | |
1318 | } else if (stat(SSH_SYSTEM_RC, &st) >= 0) { | |
1319 | if (debug_flag) | |
30228d7c | 1320 | fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_SYSTEM_RC); |
7368a6c8 | 1321 | |
30228d7c | 1322 | f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w"); |
7368a6c8 | 1323 | if (f) { |
1324 | if (auth_proto != NULL && auth_data != NULL) | |
1325 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1326 | pclose(f); | |
1327 | } else | |
1328 | fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC); | |
6fc1e9f3 | 1329 | } else if (options.xauth_location != NULL) { |
7368a6c8 | 1330 | /* Add authority data to .Xauthority if appropriate. */ |
1331 | if (auth_proto != NULL && auth_data != NULL) { | |
29611d9c | 1332 | char *screen = strchr(display, ':'); |
1333 | if (debug_flag) { | |
71276795 | 1334 | fprintf(stderr, |
1335 | "Running %.100s add %.100s %.100s %.100s\n", | |
6fc1e9f3 | 1336 | options.xauth_location, display, |
1337 | auth_proto, auth_data); | |
7322ef0e | 1338 | #ifndef HAVE_CYGWIN /* Unix sockets are not supported */ |
29611d9c | 1339 | if (screen != NULL) |
71276795 | 1340 | fprintf(stderr, |
1341 | "Adding %.*s/unix%s %s %s\n", | |
14a9a859 | 1342 | (int)(screen-display), display, |
71276795 | 1343 | screen, auth_proto, auth_data); |
7322ef0e | 1344 | #endif |
29611d9c | 1345 | } |
6fc1e9f3 | 1346 | snprintf(cmd, sizeof cmd, "%s -q -", |
1347 | options.xauth_location); | |
1348 | f = popen(cmd, "w"); | |
7368a6c8 | 1349 | if (f) { |
71276795 | 1350 | fprintf(f, "add %s %s %s\n", display, |
1351 | auth_proto, auth_data); | |
7322ef0e | 1352 | #ifndef HAVE_CYGWIN /* Unix sockets are not supported */ |
29611d9c | 1353 | if (screen != NULL) |
1354 | fprintf(f, "add %.*s/unix%s %s %s\n", | |
14a9a859 | 1355 | (int)(screen-display), display, |
71276795 | 1356 | screen, auth_proto, auth_data); |
7322ef0e | 1357 | #endif |
7368a6c8 | 1358 | pclose(f); |
6fc1e9f3 | 1359 | } else { |
1360 | fprintf(stderr, "Could not run %s\n", | |
1361 | cmd); | |
1362 | } | |
7368a6c8 | 1363 | } |
1364 | } | |
7368a6c8 | 1365 | /* Get the last component of the shell name. */ |
1366 | cp = strrchr(shell, '/'); | |
1367 | if (cp) | |
1368 | cp++; | |
1369 | else | |
1370 | cp = shell; | |
1371 | } | |
1372 | /* | |
1373 | * If we have no command, execute the shell. In this case, the shell | |
1374 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1375 | * this is a login shell. | |
1376 | */ | |
1377 | if (!command) { | |
1378 | if (!options.use_login) { | |
1379 | char buf[256]; | |
1380 | ||
1381 | /* | |
1382 | * Check for mail if we have a tty and it was enabled | |
1383 | * in server options. | |
1384 | */ | |
1385 | if (ttyname && options.check_mail) { | |
1386 | char *mailbox; | |
1387 | struct stat mailstat; | |
1388 | mailbox = getenv("MAIL"); | |
1389 | if (mailbox != NULL) { | |
71276795 | 1390 | if (stat(mailbox, &mailstat) != 0 || |
1391 | mailstat.st_size == 0) | |
7368a6c8 | 1392 | printf("No mail.\n"); |
1393 | else if (mailstat.st_mtime < mailstat.st_atime) | |
1394 | printf("You have mail.\n"); | |
1395 | else | |
1396 | printf("You have new mail.\n"); | |
1397 | } | |
1398 | } | |
1399 | /* Start the shell. Set initial character to '-'. */ | |
1400 | buf[0] = '-'; | |
1401 | strncpy(buf + 1, cp, sizeof(buf) - 1); | |
1402 | buf[sizeof(buf) - 1] = 0; | |
1403 | ||
1404 | /* Execute the shell. */ | |
1405 | argv[0] = buf; | |
1406 | argv[1] = NULL; | |
1407 | execve(shell, argv, env); | |
1408 | ||
1409 | /* Executing the shell failed. */ | |
1410 | perror(shell); | |
1411 | exit(1); | |
1412 | ||
1413 | } else { | |
1414 | /* Launch login(1). */ | |
1415 | ||
2e73a022 | 1416 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
c345cf9d | 1417 | "-p", "-f", "--", pw->pw_name, NULL); |
7368a6c8 | 1418 | |
1419 | /* Login couldn't be executed, die. */ | |
1420 | ||
1421 | perror("login"); | |
1422 | exit(1); | |
1423 | } | |
1424 | } | |
1425 | /* | |
1426 | * Execute the command using the user's shell. This uses the -c | |
1427 | * option to execute the command. | |
1428 | */ | |
1429 | argv[0] = (char *) cp; | |
1430 | argv[1] = "-c"; | |
1431 | argv[2] = (char *) command; | |
1432 | argv[3] = NULL; | |
1433 | execve(shell, argv, env); | |
1434 | perror(shell); | |
1435 | exit(1); | |
1436 | } | |
1437 | ||
1438 | Session * | |
1439 | session_new(void) | |
1440 | { | |
1441 | int i; | |
1442 | static int did_init = 0; | |
1443 | if (!did_init) { | |
1444 | debug("session_new: init"); | |
1445 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1446 | sessions[i].used = 0; | |
1447 | sessions[i].self = i; | |
1448 | } | |
1449 | did_init = 1; | |
1450 | } | |
1451 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1452 | Session *s = &sessions[i]; | |
1453 | if (! s->used) { | |
1454 | s->pid = 0; | |
0b242b12 | 1455 | s->extended = 0; |
7368a6c8 | 1456 | s->chanid = -1; |
1457 | s->ptyfd = -1; | |
1458 | s->ttyfd = -1; | |
1459 | s->term = NULL; | |
1460 | s->pw = NULL; | |
1461 | s->display = NULL; | |
1462 | s->screen = 0; | |
1463 | s->auth_data = NULL; | |
1464 | s->auth_proto = NULL; | |
1465 | s->used = 1; | |
0b242b12 | 1466 | s->pw = NULL; |
02323c45 | 1467 | debug("session_new: session %d", i); |
7368a6c8 | 1468 | return s; |
1469 | } | |
1470 | } | |
1471 | return NULL; | |
1472 | } | |
1473 | ||
1474 | void | |
1475 | session_dump(void) | |
1476 | { | |
1477 | int i; | |
1478 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1479 | Session *s = &sessions[i]; | |
1480 | debug("dump: used %d session %d %p channel %d pid %d", | |
1481 | s->used, | |
1482 | s->self, | |
1483 | s, | |
1484 | s->chanid, | |
1485 | s->pid); | |
1486 | } | |
1487 | } | |
1488 | ||
e78a59f5 | 1489 | int |
1490 | session_open(int chanid) | |
1491 | { | |
1492 | Session *s = session_new(); | |
1493 | debug("session_open: channel %d", chanid); | |
1494 | if (s == NULL) { | |
1495 | error("no more sessions"); | |
1496 | return 0; | |
1497 | } | |
e78a59f5 | 1498 | s->pw = auth_get_user(); |
1499 | if (s->pw == NULL) | |
0b242b12 | 1500 | fatal("no user for session %i", s->self); |
1501 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1502 | s->chanid = chanid; | |
e78a59f5 | 1503 | return 1; |
1504 | } | |
1505 | ||
1506 | Session * | |
1507 | session_by_channel(int id) | |
1508 | { | |
1509 | int i; | |
1510 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1511 | Session *s = &sessions[i]; | |
1512 | if (s->used && s->chanid == id) { | |
1513 | debug("session_by_channel: session %d channel %d", i, id); | |
1514 | return s; | |
1515 | } | |
1516 | } | |
1517 | debug("session_by_channel: unknown channel %d", id); | |
1518 | session_dump(); | |
1519 | return NULL; | |
1520 | } | |
1521 | ||
1522 | Session * | |
1523 | session_by_pid(pid_t pid) | |
1524 | { | |
1525 | int i; | |
1526 | debug("session_by_pid: pid %d", pid); | |
1527 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1528 | Session *s = &sessions[i]; | |
1529 | if (s->used && s->pid == pid) | |
1530 | return s; | |
1531 | } | |
1532 | error("session_by_pid: unknown pid %d", pid); | |
1533 | session_dump(); | |
1534 | return NULL; | |
1535 | } | |
1536 | ||
1537 | int | |
1538 | session_window_change_req(Session *s) | |
1539 | { | |
1540 | s->col = packet_get_int(); | |
1541 | s->row = packet_get_int(); | |
1542 | s->xpixel = packet_get_int(); | |
1543 | s->ypixel = packet_get_int(); | |
6ae2364d | 1544 | packet_done(); |
e78a59f5 | 1545 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1546 | return 1; | |
1547 | } | |
1548 | ||
1549 | int | |
1550 | session_pty_req(Session *s) | |
1551 | { | |
1552 | unsigned int len; | |
6ae2364d | 1553 | char *term_modes; /* encoded terminal modes */ |
e78a59f5 | 1554 | |
38c295d6 | 1555 | if (no_pty_flag) |
1556 | return 0; | |
e78a59f5 | 1557 | if (s->ttyfd != -1) |
6ae2364d | 1558 | return 0; |
e78a59f5 | 1559 | s->term = packet_get_string(&len); |
1560 | s->col = packet_get_int(); | |
1561 | s->row = packet_get_int(); | |
1562 | s->xpixel = packet_get_int(); | |
1563 | s->ypixel = packet_get_int(); | |
6ae2364d | 1564 | term_modes = packet_get_string(&len); |
1565 | packet_done(); | |
e78a59f5 | 1566 | |
1567 | if (strcmp(s->term, "") == 0) { | |
1568 | xfree(s->term); | |
1569 | s->term = NULL; | |
1570 | } | |
1571 | /* Allocate a pty and open it. */ | |
1572 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) { | |
1573 | xfree(s->term); | |
1574 | s->term = NULL; | |
1575 | s->ptyfd = -1; | |
1576 | s->ttyfd = -1; | |
1577 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1578 | xfree(term_modes); |
1579 | return 0; | |
e78a59f5 | 1580 | } |
1581 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1582 | /* | |
1583 | * Add a cleanup function to clear the utmp entry and record logout | |
1584 | * time in case we call fatal() (e.g., the connection gets closed). | |
1585 | */ | |
1586 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
1587 | pty_setowner(s->pw, s->tty); | |
1588 | /* Get window size from the packet. */ | |
1589 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1590 | ||
1d1ffb87 | 1591 | session_proctitle(s); |
1592 | ||
35484284 | 1593 | /* XXX parse and set terminal modes */ |
1594 | xfree(term_modes); | |
e78a59f5 | 1595 | return 1; |
1596 | } | |
1597 | ||
0b242b12 | 1598 | int |
1599 | session_subsystem_req(Session *s) | |
1600 | { | |
1601 | unsigned int len; | |
1602 | int success = 0; | |
1603 | char *subsys = packet_get_string(&len); | |
38c295d6 | 1604 | int i; |
0b242b12 | 1605 | |
1606 | packet_done(); | |
1607 | log("subsystem request for %s", subsys); | |
1608 | ||
38c295d6 | 1609 | for (i = 0; i < options.num_subsystems; i++) { |
1610 | if(strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1611 | debug("subsystem: exec() %s", options.subsystem_command[i]); | |
1612 | do_exec_no_pty(s, options.subsystem_command[i], s->pw); | |
1613 | success = 1; | |
1614 | } | |
1615 | } | |
1616 | ||
1617 | if (!success) | |
1618 | log("subsystem request for %s failed, subsystem not found", subsys); | |
1619 | ||
0b242b12 | 1620 | xfree(subsys); |
1621 | return success; | |
1622 | } | |
1623 | ||
1624 | int | |
1625 | session_x11_req(Session *s) | |
1626 | { | |
b5e300c2 | 1627 | int fd; |
089fbbd2 | 1628 | if (no_x11_forwarding_flag) { |
38c295d6 | 1629 | debug("X11 forwarding disabled in user configuration file."); |
1630 | return 0; | |
1631 | } | |
0b242b12 | 1632 | if (!options.x11_forwarding) { |
1633 | debug("X11 forwarding disabled in server configuration file."); | |
1634 | return 0; | |
1635 | } | |
1636 | if (xauthfile != NULL) { | |
1637 | debug("X11 fwd already started."); | |
1638 | return 0; | |
1639 | } | |
1640 | ||
1641 | debug("Received request for X11 forwarding with auth spoofing."); | |
1642 | if (s->display != NULL) | |
1643 | packet_disconnect("Protocol error: X11 display already set."); | |
1644 | ||
1645 | s->single_connection = packet_get_char(); | |
1646 | s->auth_proto = packet_get_string(NULL); | |
1647 | s->auth_data = packet_get_string(NULL); | |
1648 | s->screen = packet_get_int(); | |
1649 | packet_done(); | |
1650 | ||
1651 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
1652 | if (s->display == NULL) { | |
1653 | xfree(s->auth_proto); | |
1654 | xfree(s->auth_data); | |
1655 | return 0; | |
1656 | } | |
1657 | xauthfile = xmalloc(MAXPATHLEN); | |
1658 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
1659 | temporarily_use_uid(s->pw->pw_uid); | |
1660 | if (mkdtemp(xauthfile) == NULL) { | |
1661 | restore_uid(); | |
1662 | error("private X11 dir: mkdtemp %s failed: %s", | |
1663 | xauthfile, strerror(errno)); | |
1664 | xfree(xauthfile); | |
1665 | xauthfile = NULL; | |
1666 | xfree(s->auth_proto); | |
1667 | xfree(s->auth_data); | |
1668 | /* XXXX remove listening channels */ | |
1669 | return 0; | |
1670 | } | |
1671 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 1672 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
1673 | if (fd >= 0) | |
1674 | close(fd); | |
0b242b12 | 1675 | restore_uid(); |
1676 | fatal_add_cleanup(xauthfile_cleanup_proc, s); | |
1677 | return 1; | |
1678 | } | |
1679 | ||
38c295d6 | 1680 | int |
1681 | session_shell_req(Session *s) | |
1682 | { | |
1683 | /* if forced_command == NULL, the shell is execed */ | |
1684 | char *shell = forced_command; | |
1685 | packet_done(); | |
1686 | s->extended = 1; | |
1687 | if (s->ttyfd == -1) | |
1688 | do_exec_no_pty(s, shell, s->pw); | |
1689 | else | |
1690 | do_exec_pty(s, shell, s->pw); | |
1691 | return 1; | |
1692 | } | |
1693 | ||
1694 | int | |
1695 | session_exec_req(Session *s) | |
1696 | { | |
1697 | unsigned int len; | |
1698 | char *command = packet_get_string(&len); | |
1699 | packet_done(); | |
1700 | if (forced_command) { | |
b5e300c2 | 1701 | original_command = command; |
38c295d6 | 1702 | command = forced_command; |
1703 | debug("Forced command '%.500s'", forced_command); | |
1704 | } | |
1705 | s->extended = 1; | |
1706 | if (s->ttyfd == -1) | |
1707 | do_exec_no_pty(s, command, s->pw); | |
1708 | else | |
1709 | do_exec_pty(s, command, s->pw); | |
1710 | if (forced_command == NULL) | |
1711 | xfree(command); | |
1712 | return 1; | |
1713 | } | |
1714 | ||
e78a59f5 | 1715 | void |
1716 | session_input_channel_req(int id, void *arg) | |
1717 | { | |
1718 | unsigned int len; | |
1719 | int reply; | |
1720 | int success = 0; | |
1721 | char *rtype; | |
1722 | Session *s; | |
1723 | Channel *c; | |
1724 | ||
1725 | rtype = packet_get_string(&len); | |
1726 | reply = packet_get_char(); | |
1727 | ||
1728 | s = session_by_channel(id); | |
1729 | if (s == NULL) | |
1730 | fatal("session_input_channel_req: channel %d: no session", id); | |
1731 | c = channel_lookup(id); | |
1732 | if (c == NULL) | |
1733 | fatal("session_input_channel_req: channel %d: bad channel", id); | |
1734 | ||
1735 | debug("session_input_channel_req: session %d channel %d request %s reply %d", | |
1736 | s->self, id, rtype, reply); | |
1737 | ||
1738 | /* | |
1739 | * a session is in LARVAL state until a shell | |
1740 | * or programm is executed | |
1741 | */ | |
1742 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1743 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1744 | success = session_shell_req(s); |
e78a59f5 | 1745 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1746 | success = session_exec_req(s); |
e78a59f5 | 1747 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1748 | success = session_pty_req(s); |
0b242b12 | 1749 | } else if (strcmp(rtype, "x11-req") == 0) { |
1750 | success = session_x11_req(s); | |
1751 | } else if (strcmp(rtype, "subsystem") == 0) { | |
1752 | success = session_subsystem_req(s); | |
e78a59f5 | 1753 | } |
1754 | } | |
1755 | if (strcmp(rtype, "window-change") == 0) { | |
1756 | success = session_window_change_req(s); | |
1757 | } | |
1758 | ||
1759 | if (reply) { | |
1760 | packet_start(success ? | |
1761 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1762 | packet_put_int(c->remote_id); | |
1763 | packet_send(); | |
1764 | } | |
1765 | xfree(rtype); | |
1766 | } | |
1767 | ||
1768 | void | |
1769 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1770 | { | |
1771 | if (!compat20) | |
1772 | fatal("session_set_fds: called for proto != 2.0"); | |
1773 | /* | |
1774 | * now that have a child and a pipe to the child, | |
1775 | * we can activate our channel and register the fd's | |
1776 | */ | |
1777 | if (s->chanid == -1) | |
1778 | fatal("no channel for session %d", s->self); | |
1779 | channel_set_fds(s->chanid, | |
1780 | fdout, fdin, fderr, | |
1781 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ); | |
1782 | } | |
1783 | ||
7368a6c8 | 1784 | void |
1785 | session_pty_cleanup(Session *s) | |
1786 | { | |
1787 | if (s == NULL || s->ttyfd == -1) | |
1788 | return; | |
1789 | ||
1790 | debug("session_pty_cleanup: session %i release %s", s->self, s->tty); | |
1791 | ||
1792 | /* Cancel the cleanup function. */ | |
1793 | fatal_remove_cleanup(pty_cleanup_proc, (void *)s); | |
1794 | ||
1795 | /* Record that the user has logged out. */ | |
1796 | record_logout(s->pid, s->tty); | |
1797 | ||
1798 | /* Release the pseudo-tty. */ | |
1799 | pty_release(s->tty); | |
1800 | ||
1801 | /* | |
1802 | * Close the server side of the socket pairs. We must do this after | |
1803 | * the pty cleanup, so that another process doesn't get this pty | |
1804 | * while we're still cleaning up. | |
1805 | */ | |
1806 | if (close(s->ptymaster) < 0) | |
1807 | error("close(s->ptymaster): %s", strerror(errno)); | |
1808 | } | |
e78a59f5 | 1809 | |
1810 | void | |
1811 | session_exit_message(Session *s, int status) | |
1812 | { | |
1813 | Channel *c; | |
1814 | if (s == NULL) | |
1815 | fatal("session_close: no session"); | |
1816 | c = channel_lookup(s->chanid); | |
1817 | if (c == NULL) | |
1818 | fatal("session_close: session %d: no channel %d", | |
1819 | s->self, s->chanid); | |
1820 | debug("session_exit_message: session %d channel %d pid %d", | |
1821 | s->self, s->chanid, s->pid); | |
1822 | ||
1823 | if (WIFEXITED(status)) { | |
1824 | channel_request_start(s->chanid, | |
1825 | "exit-status", 0); | |
1826 | packet_put_int(WEXITSTATUS(status)); | |
1827 | packet_send(); | |
1828 | } else if (WIFSIGNALED(status)) { | |
1829 | channel_request_start(s->chanid, | |
1830 | "exit-signal", 0); | |
1831 | packet_put_int(WTERMSIG(status)); | |
a64009ad | 1832 | #ifdef WCOREDUMP |
e78a59f5 | 1833 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1834 | #else /* WCOREDUMP */ |
1835 | packet_put_char(0); | |
1836 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1837 | packet_put_cstring(""); |
1838 | packet_put_cstring(""); | |
1839 | packet_send(); | |
1840 | } else { | |
1841 | /* Some weird exit cause. Just exit. */ | |
1842 | packet_disconnect("wait returned status %04x.", status); | |
1843 | } | |
1844 | ||
1845 | /* disconnect channel */ | |
1846 | debug("session_exit_message: release channel %d", s->chanid); | |
1847 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1848 | /* |
1849 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1850 | * interested in data we write. | |
1851 | * Note that we must not call 'chan_read_failed', since there could | |
1852 | * be some more data waiting in the pipe. | |
4d670c24 | 1853 | * djm - This is no longer true as we have allowed one pass through |
1854 | * the select loop before killing the connection | |
9da5c3c9 | 1855 | */ |
0b242b12 | 1856 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1857 | chan_write_failed(c); | |
4d670c24 | 1858 | if (c->istate != CHAN_INPUT_CLOSED) |
1859 | chan_read_failed(c); | |
e78a59f5 | 1860 | s->chanid = -1; |
1861 | } | |
1862 | ||
1863 | void | |
1864 | session_free(Session *s) | |
1865 | { | |
1866 | debug("session_free: session %d pid %d", s->self, s->pid); | |
1867 | if (s->term) | |
1868 | xfree(s->term); | |
1869 | if (s->display) | |
1870 | xfree(s->display); | |
1871 | if (s->auth_data) | |
1872 | xfree(s->auth_data); | |
1873 | if (s->auth_proto) | |
1874 | xfree(s->auth_proto); | |
1875 | s->used = 0; | |
1876 | } | |
1877 | ||
1878 | void | |
1879 | session_close(Session *s) | |
1880 | { | |
1881 | session_pty_cleanup(s); | |
1882 | session_free(s); | |
1d1ffb87 | 1883 | session_proctitle(s); |
e78a59f5 | 1884 | } |
1885 | ||
1886 | void | |
1887 | session_close_by_pid(pid_t pid, int status) | |
1888 | { | |
1889 | Session *s = session_by_pid(pid); | |
1890 | if (s == NULL) { | |
1891 | debug("session_close_by_pid: no session for pid %d", s->pid); | |
1892 | return; | |
1893 | } | |
1894 | if (s->chanid != -1) | |
1895 | session_exit_message(s, status); | |
1896 | session_close(s); | |
1897 | } | |
1898 | ||
1899 | /* | |
1900 | * this is called when a channel dies before | |
1901 | * the session 'child' itself dies | |
1902 | */ | |
1903 | void | |
1904 | session_close_by_channel(int id, void *arg) | |
1905 | { | |
1906 | Session *s = session_by_channel(id); | |
1907 | if (s == NULL) { | |
1908 | debug("session_close_by_channel: no session for channel %d", id); | |
1909 | return; | |
1910 | } | |
1911 | /* disconnect channel */ | |
1912 | channel_cancel_cleanup(s->chanid); | |
1913 | s->chanid = -1; | |
1914 | ||
1915 | debug("session_close_by_channel: channel %d kill %d", id, s->pid); | |
1916 | if (s->pid == 0) { | |
1917 | /* close session immediately */ | |
1918 | session_close(s); | |
1919 | } else { | |
1920 | /* notify child, delay session cleanup */ | |
f528fdf2 | 1921 | if (s->pid <= 1) |
512ad3c0 | 1922 | fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid); |
1923 | if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0) | |
e78a59f5 | 1924 | error("session_close_by_channel: kill %d: %s", |
1925 | s->pid, strerror(errno)); | |
1926 | } | |
1927 | } | |
1928 | ||
1d1ffb87 | 1929 | char * |
1930 | session_tty_list(void) | |
1931 | { | |
1932 | static char buf[1024]; | |
1933 | int i; | |
1934 | buf[0] = '\0'; | |
1935 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1936 | Session *s = &sessions[i]; | |
1937 | if (s->used && s->ttyfd != -1) { | |
1938 | if (buf[0] != '\0') | |
1939 | strlcat(buf, ",", sizeof buf); | |
1940 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1941 | } | |
1942 | } | |
1943 | if (buf[0] == '\0') | |
1944 | strlcpy(buf, "notty", sizeof buf); | |
1945 | return buf; | |
1946 | } | |
1947 | ||
1948 | void | |
1949 | session_proctitle(Session *s) | |
1950 | { | |
1951 | if (s->pw == NULL) | |
1952 | error("no user for session %d", s->self); | |
1953 | else | |
1954 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
1955 | } | |
1956 | ||
e78a59f5 | 1957 | void |
1958 | do_authenticated2(void) | |
1959 | { | |
0b65b628 | 1960 | #ifdef HAVE_LOGIN_CAP |
2e73a022 | 1961 | struct passwd *pw; |
0b65b628 | 1962 | #endif |
2e73a022 | 1963 | |
e78a59f5 | 1964 | /* |
1965 | * Cancel the alarm we set to limit the time taken for | |
1966 | * authentication. | |
1967 | */ | |
1968 | alarm(0); | |
3f7a7e4a | 1969 | if (startup_pipe != -1) { |
5540ea9b | 1970 | close(startup_pipe); |
3f7a7e4a | 1971 | startup_pipe = -1; |
1972 | } | |
97994d32 | 1973 | #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD) |
2e73a022 | 1974 | pw = auth_get_user(); |
1975 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
1976 | error("unable to get login class"); | |
1977 | return; | |
1978 | } | |
1979 | #endif | |
e78a59f5 | 1980 | server_loop2(); |
34bce9a5 | 1981 | if (xauthfile) |
1982 | xauthfile_cleanup_proc(NULL); | |
e78a59f5 | 1983 | } |