]>
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" | |
5ca51e19 | 36 | RCSID("$OpenBSD: session.c,v 1.55 2001/02/08 19:30:52 itojun Exp $"); |
7368a6c8 | 37 | |
7368a6c8 | 38 | #include "ssh.h" |
42f11eb2 | 39 | #include "ssh1.h" |
40 | #include "ssh2.h" | |
41 | #include "xmalloc.h" | |
7368a6c8 | 42 | #include "pty.h" |
43 | #include "packet.h" | |
44 | #include "buffer.h" | |
7368a6c8 | 45 | #include "mpaux.h" |
7368a6c8 | 46 | #include "uidswap.h" |
47 | #include "compat.h" | |
48 | #include "channels.h" | |
49 | #include "nchan.h" | |
e78a59f5 | 50 | #include "bufaux.h" |
e78a59f5 | 51 | #include "auth.h" |
38c295d6 | 52 | #include "auth-options.h" |
42f11eb2 | 53 | #include "pathnames.h" |
54 | #include "log.h" | |
55 | #include "servconf.h" | |
56 | #include "login.h" | |
57 | #include "serverloop.h" | |
58 | #include "canohost.h" | |
5ca51e19 | 59 | #include "session.h" |
e78a59f5 | 60 | |
3206bb3b | 61 | #ifdef WITH_IRIX_PROJECT |
62 | #include <proj.h> | |
63 | #endif /* WITH_IRIX_PROJECT */ | |
d287c664 | 64 | #ifdef WITH_IRIX_JOBS |
65 | #include <sys/resource.h> | |
2b87da3b | 66 | #endif |
260d427b | 67 | #ifdef WITH_IRIX_AUDIT |
68 | #include <sat.h> | |
69 | #endif /* WITH_IRIX_AUDIT */ | |
3206bb3b | 70 | |
089fbbd2 | 71 | #if defined(HAVE_USERSEC_H) |
72 | #include <usersec.h> | |
73 | #endif | |
74 | ||
4d33e531 | 75 | #ifdef HAVE_OSF_SIA |
76 | # include <sia.h> | |
77 | # include <siad.h> | |
78 | #endif | |
79 | ||
3c62e7eb | 80 | #ifdef HAVE_CYGWIN |
81 | #include <windows.h> | |
82 | #include <sys/cygwin.h> | |
83 | #define is_winnt (GetVersion() < 0x80000000) | |
84 | #endif | |
85 | ||
3fcce26c | 86 | /* AIX limits */ |
87 | #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE) | |
2a2cb9e7 | 88 | # define S_UFSIZE_HARD S_UFSIZE "_hard" |
89 | # define S_UCPU_HARD S_UCPU "_hard" | |
90 | # define S_UDATA_HARD S_UDATA "_hard" | |
91 | # define S_USTACK_HARD S_USTACK "_hard" | |
92 | # define S_URSS_HARD S_URSS "_hard" | |
93 | # define S_UCORE_HARD S_UCORE "_hard" | |
94 | # define S_UNOFILE_HARD S_UNOFILE "_hard" | |
3fcce26c | 95 | #endif |
96 | ||
2e73a022 | 97 | #ifdef HAVE_LOGIN_CAP |
98 | #include <login_cap.h> | |
99 | #endif | |
100 | ||
7368a6c8 | 101 | /* types */ |
102 | ||
103 | #define TTYSZ 64 | |
104 | typedef struct Session Session; | |
105 | struct Session { | |
106 | int used; | |
107 | int self; | |
0b242b12 | 108 | int extended; |
7368a6c8 | 109 | struct passwd *pw; |
110 | pid_t pid; | |
111 | /* tty */ | |
112 | char *term; | |
113 | int ptyfd, ttyfd, ptymaster; | |
114 | int row, col, xpixel, ypixel; | |
115 | char tty[TTYSZ]; | |
116 | /* X11 */ | |
117 | char *display; | |
118 | int screen; | |
119 | char *auth_proto; | |
120 | char *auth_data; | |
0b242b12 | 121 | int single_connection; |
7368a6c8 | 122 | /* proto 2 */ |
123 | int chanid; | |
124 | }; | |
125 | ||
126 | /* func */ | |
127 | ||
128 | Session *session_new(void); | |
129 | void session_set_fds(Session *s, int fdin, int fdout, int fderr); | |
130 | void session_pty_cleanup(Session *s); | |
1d1ffb87 | 131 | void session_proctitle(Session *s); |
7368a6c8 | 132 | void do_exec_pty(Session *s, const char *command, struct passwd * pw); |
133 | void do_exec_no_pty(Session *s, const char *command, struct passwd * pw); | |
a22aff1f | 134 | void do_login(Session *s, const char *command); |
7368a6c8 | 135 | |
136 | void | |
137 | do_child(const char *command, struct passwd * pw, const char *term, | |
138 | const char *display, const char *auth_proto, | |
139 | const char *auth_data, const char *ttyname); | |
140 | ||
141 | /* import */ | |
142 | extern ServerOptions options; | |
143 | extern char *__progname; | |
144 | extern int log_stderr; | |
145 | extern int debug_flag; | |
1e3b8b07 | 146 | extern u_int utmp_len; |
7368a6c8 | 147 | |
089fbbd2 | 148 | extern int startup_pipe; |
149 | ||
7368a6c8 | 150 | /* Local Xauthority file. */ |
151 | static char *xauthfile; | |
152 | ||
b5e300c2 | 153 | /* original command from peer. */ |
2b87da3b | 154 | char *original_command = NULL; |
b5e300c2 | 155 | |
7368a6c8 | 156 | /* data */ |
157 | #define MAX_SESSIONS 10 | |
158 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 159 | |
c1ef8333 | 160 | #ifdef WITH_AIXAUTHENTICATE |
161 | /* AIX's lastlogin message, set in auth1.c */ | |
162 | char *aixloginmsg; | |
163 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 164 | |
2e73a022 | 165 | #ifdef HAVE_LOGIN_CAP |
166 | static login_cap_t *lc; | |
167 | #endif | |
168 | ||
7368a6c8 | 169 | /* |
170 | * Remove local Xauthority file. | |
171 | */ | |
172 | void | |
173 | xauthfile_cleanup_proc(void *ignore) | |
174 | { | |
175 | debug("xauthfile_cleanup_proc called"); | |
176 | ||
177 | if (xauthfile != NULL) { | |
178 | char *p; | |
179 | unlink(xauthfile); | |
180 | p = strrchr(xauthfile, '/'); | |
181 | if (p != NULL) { | |
182 | *p = '\0'; | |
183 | rmdir(xauthfile); | |
184 | } | |
185 | xfree(xauthfile); | |
186 | xauthfile = NULL; | |
187 | } | |
188 | } | |
189 | ||
190 | /* | |
191 | * Function to perform cleanup if we get aborted abnormally (e.g., due to a | |
192 | * dropped connection). | |
193 | */ | |
6ae2364d | 194 | void |
7368a6c8 | 195 | pty_cleanup_proc(void *session) |
196 | { | |
197 | Session *s=session; | |
198 | if (s == NULL) | |
199 | fatal("pty_cleanup_proc: no session"); | |
200 | debug("pty_cleanup_proc: %s", s->tty); | |
201 | ||
202 | if (s->pid != 0) { | |
203 | /* Record that the user has logged out. */ | |
204 | record_logout(s->pid, s->tty); | |
205 | } | |
206 | ||
207 | /* Release the pseudo-tty. */ | |
208 | pty_release(s->tty); | |
209 | } | |
210 | ||
211 | /* | |
212 | * Prepares for an interactive session. This is called after the user has | |
213 | * been successfully authenticated. During this message exchange, pseudo | |
214 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
215 | * are requested, etc. | |
216 | */ | |
6ae2364d | 217 | void |
7368a6c8 | 218 | do_authenticated(struct passwd * pw) |
219 | { | |
220 | Session *s; | |
b5e300c2 | 221 | int type, fd; |
7368a6c8 | 222 | int compression_level = 0, enable_compression_after_reply = 0; |
223 | int have_pty = 0; | |
224 | char *command; | |
225 | int n_bytes; | |
226 | int plen; | |
1e3b8b07 | 227 | u_int proto_len, data_len, dlen; |
7368a6c8 | 228 | |
229 | /* | |
230 | * Cancel the alarm we set to limit the time taken for | |
231 | * authentication. | |
232 | */ | |
233 | alarm(0); | |
3f7a7e4a | 234 | if (startup_pipe != -1) { |
5540ea9b | 235 | close(startup_pipe); |
3f7a7e4a | 236 | startup_pipe = -1; |
237 | } | |
7368a6c8 | 238 | |
239 | /* | |
240 | * Inform the channel mechanism that we are the server side and that | |
241 | * the client may request to connect to any port at all. (The user | |
242 | * could do it anyway, and we wouldn\'t know what is permitted except | |
243 | * by the client telling us, so we can equally well trust the client | |
244 | * not to request anything bogus.) | |
245 | */ | |
33de75a3 | 246 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) |
7368a6c8 | 247 | channel_permit_all_opens(); |
248 | ||
249 | s = session_new(); | |
0b242b12 | 250 | s->pw = pw; |
7368a6c8 | 251 | |
97994d32 | 252 | #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD) |
2e73a022 | 253 | if ((lc = login_getclass(pw->pw_class)) == NULL) { |
254 | error("unable to get login class"); | |
255 | return; | |
256 | } | |
257 | #endif | |
258 | ||
7368a6c8 | 259 | /* |
260 | * We stay in this loop until the client requests to execute a shell | |
261 | * or a command. | |
262 | */ | |
263 | for (;;) { | |
264 | int success = 0; | |
265 | ||
266 | /* Get a packet from the client. */ | |
267 | type = packet_read(&plen); | |
268 | ||
269 | /* Process the packet. */ | |
270 | switch (type) { | |
271 | case SSH_CMSG_REQUEST_COMPRESSION: | |
272 | packet_integrity_check(plen, 4, type); | |
273 | compression_level = packet_get_int(); | |
274 | if (compression_level < 1 || compression_level > 9) { | |
275 | packet_send_debug("Received illegal compression level %d.", | |
276 | compression_level); | |
277 | break; | |
278 | } | |
279 | /* Enable compression after we have responded with SUCCESS. */ | |
280 | enable_compression_after_reply = 1; | |
281 | success = 1; | |
282 | break; | |
283 | ||
284 | case SSH_CMSG_REQUEST_PTY: | |
285 | if (no_pty_flag) { | |
286 | debug("Allocating a pty not permitted for this authentication."); | |
287 | break; | |
288 | } | |
289 | if (have_pty) | |
290 | packet_disconnect("Protocol error: you already have a pty."); | |
291 | ||
292 | debug("Allocating pty."); | |
293 | ||
294 | /* Allocate a pty and open it. */ | |
295 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, | |
296 | sizeof(s->tty))) { | |
297 | error("Failed to allocate pty."); | |
298 | break; | |
299 | } | |
300 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
301 | pty_setowner(pw, s->tty); | |
302 | ||
303 | /* Get TERM from the packet. Note that the value may be of arbitrary length. */ | |
304 | s->term = packet_get_string(&dlen); | |
305 | packet_integrity_check(dlen, strlen(s->term), type); | |
306 | /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */ | |
307 | /* Remaining bytes */ | |
308 | n_bytes = plen - (4 + dlen + 4 * 4); | |
309 | ||
310 | if (strcmp(s->term, "") == 0) { | |
311 | xfree(s->term); | |
312 | s->term = NULL; | |
313 | } | |
314 | /* Get window size from the packet. */ | |
315 | s->row = packet_get_int(); | |
316 | s->col = packet_get_int(); | |
317 | s->xpixel = packet_get_int(); | |
318 | s->ypixel = packet_get_int(); | |
319 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
320 | ||
321 | /* Get tty modes from the packet. */ | |
322 | tty_parse_modes(s->ttyfd, &n_bytes); | |
323 | packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type); | |
324 | ||
1d1ffb87 | 325 | session_proctitle(s); |
326 | ||
7368a6c8 | 327 | /* Indicate that we now have a pty. */ |
328 | success = 1; | |
329 | have_pty = 1; | |
330 | break; | |
331 | ||
332 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
333 | if (!options.x11_forwarding) { | |
334 | packet_send_debug("X11 forwarding disabled in server configuration file."); | |
335 | break; | |
336 | } | |
6fc1e9f3 | 337 | if (!options.xauth_location) { |
338 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
339 | break; | |
340 | } | |
7368a6c8 | 341 | if (no_x11_forwarding_flag) { |
342 | packet_send_debug("X11 forwarding not permitted for this authentication."); | |
343 | break; | |
344 | } | |
345 | debug("Received request for X11 forwarding with auth spoofing."); | |
346 | if (s->display != NULL) | |
347 | packet_disconnect("Protocol error: X11 display already set."); | |
348 | ||
349 | s->auth_proto = packet_get_string(&proto_len); | |
350 | s->auth_data = packet_get_string(&data_len); | |
351 | packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type); | |
352 | ||
353 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER) | |
354 | s->screen = packet_get_int(); | |
355 | else | |
356 | s->screen = 0; | |
357 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
358 | ||
359 | if (s->display == NULL) | |
360 | break; | |
361 | ||
362 | /* Setup to always have a local .Xauthority. */ | |
363 | xauthfile = xmalloc(MAXPATHLEN); | |
364 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
365 | temporarily_use_uid(pw->pw_uid); | |
366 | if (mkdtemp(xauthfile) == NULL) { | |
367 | restore_uid(); | |
368 | error("private X11 dir: mkdtemp %s failed: %s", | |
369 | xauthfile, strerror(errno)); | |
370 | xfree(xauthfile); | |
371 | xauthfile = NULL; | |
0b242b12 | 372 | /* XXXX remove listening channels */ |
7368a6c8 | 373 | break; |
374 | } | |
375 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 376 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
377 | if (fd >= 0) | |
378 | close(fd); | |
7368a6c8 | 379 | restore_uid(); |
380 | fatal_add_cleanup(xauthfile_cleanup_proc, NULL); | |
381 | success = 1; | |
382 | break; | |
7368a6c8 | 383 | |
384 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
385 | if (no_agent_forwarding_flag || compat13) { | |
386 | debug("Authentication agent forwarding not permitted for this authentication."); | |
387 | break; | |
388 | } | |
389 | debug("Received authentication agent forwarding request."); | |
6fc1e9f3 | 390 | success = auth_input_request_forwarding(pw); |
7368a6c8 | 391 | break; |
392 | ||
393 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
394 | if (no_port_forwarding_flag) { | |
395 | debug("Port forwarding not permitted for this authentication."); | |
396 | break; | |
397 | } | |
33de75a3 | 398 | if (!options.allow_tcp_forwarding) { |
399 | debug("Port forwarding not permitted."); | |
400 | break; | |
401 | } | |
7368a6c8 | 402 | debug("Received TCP/IP port forwarding request."); |
1d1ffb87 | 403 | channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 404 | success = 1; |
405 | break; | |
406 | ||
407 | case SSH_CMSG_MAX_PACKET_SIZE: | |
408 | if (packet_set_maxsize(packet_get_int()) > 0) | |
409 | success = 1; | |
410 | break; | |
411 | ||
412 | case SSH_CMSG_EXEC_SHELL: | |
413 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 414 | if (type == SSH_CMSG_EXEC_CMD) { |
415 | command = packet_get_string(&dlen); | |
416 | debug("Exec command '%.500s'", command); | |
417 | packet_integrity_check(plen, 4 + dlen, type); | |
418 | } else { | |
419 | command = NULL; | |
420 | packet_integrity_check(plen, 0, type); | |
421 | } | |
422 | if (forced_command != NULL) { | |
b5e300c2 | 423 | original_command = command; |
7368a6c8 | 424 | command = forced_command; |
425 | debug("Forced command '%.500s'", forced_command); | |
426 | } | |
427 | if (have_pty) | |
428 | do_exec_pty(s, command, pw); | |
429 | else | |
430 | do_exec_no_pty(s, command, pw); | |
431 | ||
432 | if (command != NULL) | |
433 | xfree(command); | |
434 | /* Cleanup user's local Xauthority file. */ | |
435 | if (xauthfile) | |
436 | xauthfile_cleanup_proc(NULL); | |
437 | return; | |
438 | ||
439 | default: | |
440 | /* | |
441 | * Any unknown messages in this phase are ignored, | |
442 | * and a failure message is returned. | |
443 | */ | |
444 | log("Unknown packet type received after authentication: %d", type); | |
445 | } | |
446 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
447 | packet_send(); | |
448 | packet_write_wait(); | |
449 | ||
450 | /* Enable compression now that we have replied if appropriate. */ | |
451 | if (enable_compression_after_reply) { | |
452 | enable_compression_after_reply = 0; | |
453 | packet_start_compression(compression_level); | |
454 | } | |
455 | } | |
456 | } | |
457 | ||
458 | /* | |
459 | * This is called to fork and execute a command when we have no tty. This | |
460 | * will call do_child from the child, and server_loop from the parent after | |
461 | * setting up file descriptors and such. | |
462 | */ | |
6ae2364d | 463 | void |
7368a6c8 | 464 | do_exec_no_pty(Session *s, const char *command, struct passwd * pw) |
465 | { | |
466 | int pid; | |
467 | ||
468 | #ifdef USE_PIPES | |
469 | int pin[2], pout[2], perr[2]; | |
470 | /* Allocate pipes for communicating with the program. */ | |
471 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
472 | packet_disconnect("Could not create pipes: %.100s", | |
473 | strerror(errno)); | |
474 | #else /* USE_PIPES */ | |
475 | int inout[2], err[2]; | |
476 | /* Uses socket pairs to communicate with the program. */ | |
477 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
478 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
479 | packet_disconnect("Could not create socket pairs: %.100s", | |
480 | strerror(errno)); | |
481 | #endif /* USE_PIPES */ | |
482 | if (s == NULL) | |
483 | fatal("do_exec_no_pty: no session"); | |
484 | ||
1d1ffb87 | 485 | session_proctitle(s); |
7368a6c8 | 486 | |
487 | #ifdef USE_PAM | |
488 | do_pam_setcred(); | |
489 | #endif /* USE_PAM */ | |
490 | ||
491 | /* Fork the child. */ | |
492 | if ((pid = fork()) == 0) { | |
493 | /* Child. Reinitialize the log since the pid has changed. */ | |
494 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
495 | ||
6c935fbd | 496 | signal(SIGPIPE, SIG_DFL); |
497 | ||
7368a6c8 | 498 | /* |
499 | * Create a new session and process group since the 4.4BSD | |
500 | * setlogin() affects the entire process group. | |
501 | */ | |
502 | if (setsid() < 0) | |
503 | error("setsid failed: %.100s", strerror(errno)); | |
504 | ||
505 | #ifdef USE_PIPES | |
506 | /* | |
507 | * Redirect stdin. We close the parent side of the socket | |
508 | * pair, and make the child side the standard input. | |
509 | */ | |
510 | close(pin[1]); | |
511 | if (dup2(pin[0], 0) < 0) | |
512 | perror("dup2 stdin"); | |
513 | close(pin[0]); | |
514 | ||
515 | /* Redirect stdout. */ | |
516 | close(pout[0]); | |
517 | if (dup2(pout[1], 1) < 0) | |
518 | perror("dup2 stdout"); | |
519 | close(pout[1]); | |
520 | ||
521 | /* Redirect stderr. */ | |
522 | close(perr[0]); | |
523 | if (dup2(perr[1], 2) < 0) | |
524 | perror("dup2 stderr"); | |
525 | close(perr[1]); | |
526 | #else /* USE_PIPES */ | |
527 | /* | |
528 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
529 | * use the same socket, as some programs (particularly rdist) | |
530 | * seem to depend on it. | |
531 | */ | |
532 | close(inout[1]); | |
533 | close(err[1]); | |
534 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
535 | perror("dup2 stdin"); | |
536 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
537 | perror("dup2 stdout"); | |
538 | if (dup2(err[0], 2) < 0) /* stderr */ | |
539 | perror("dup2 stderr"); | |
540 | #endif /* USE_PIPES */ | |
541 | ||
542 | /* Do processing for the child (exec command etc). */ | |
543 | do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL); | |
544 | /* NOTREACHED */ | |
545 | } | |
3c62e7eb | 546 | #ifdef HAVE_CYGWIN |
547 | if (is_winnt) | |
548 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
549 | #endif | |
7368a6c8 | 550 | if (pid < 0) |
551 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
552 | s->pid = pid; | |
b5c334cc | 553 | /* Set interactive/non-interactive mode. */ |
554 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 555 | #ifdef USE_PIPES |
556 | /* We are the parent. Close the child sides of the pipes. */ | |
557 | close(pin[0]); | |
558 | close(pout[1]); | |
559 | close(perr[1]); | |
560 | ||
e78a59f5 | 561 | if (compat20) { |
0b242b12 | 562 | session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1); |
e78a59f5 | 563 | } else { |
564 | /* Enter the interactive session. */ | |
565 | server_loop(pid, pin[1], pout[0], perr[0]); | |
566 | /* server_loop has closed pin[1], pout[1], and perr[1]. */ | |
567 | } | |
7368a6c8 | 568 | #else /* USE_PIPES */ |
569 | /* We are the parent. Close the child sides of the socket pairs. */ | |
570 | close(inout[0]); | |
571 | close(err[0]); | |
572 | ||
573 | /* | |
574 | * Enter the interactive session. Note: server_loop must be able to | |
575 | * handle the case that fdin and fdout are the same. | |
576 | */ | |
e78a59f5 | 577 | if (compat20) { |
0b242b12 | 578 | session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1); |
e78a59f5 | 579 | } else { |
580 | server_loop(pid, inout[1], inout[1], err[1]); | |
581 | /* server_loop has closed inout[1] and err[1]. */ | |
582 | } | |
7368a6c8 | 583 | #endif /* USE_PIPES */ |
584 | } | |
585 | ||
586 | /* | |
587 | * This is called to fork and execute a command when we have a tty. This | |
588 | * will call do_child from the child, and server_loop from the parent after | |
589 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
590 | * lastlog, and other such operations. | |
591 | */ | |
6ae2364d | 592 | void |
7368a6c8 | 593 | do_exec_pty(Session *s, const char *command, struct passwd * pw) |
594 | { | |
7368a6c8 | 595 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 596 | pid_t pid; |
7368a6c8 | 597 | |
598 | if (s == NULL) | |
599 | fatal("do_exec_pty: no session"); | |
600 | ptyfd = s->ptyfd; | |
601 | ttyfd = s->ttyfd; | |
602 | ||
7368a6c8 | 603 | #ifdef USE_PAM |
604 | do_pam_session(pw->pw_name, s->tty); | |
605 | do_pam_setcred(); | |
606 | #endif /* USE_PAM */ | |
607 | ||
608 | /* Fork the child. */ | |
609 | if ((pid = fork()) == 0) { | |
c345cf9d | 610 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 611 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
612 | ||
6c935fbd | 613 | signal(SIGPIPE, SIG_DFL); |
614 | ||
7368a6c8 | 615 | /* Close the master side of the pseudo tty. */ |
616 | close(ptyfd); | |
617 | ||
618 | /* Make the pseudo tty our controlling tty. */ | |
619 | pty_make_controlling_tty(&ttyfd, s->tty); | |
620 | ||
621 | /* Redirect stdin from the pseudo tty. */ | |
622 | if (dup2(ttyfd, fileno(stdin)) < 0) | |
623 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
624 | ||
625 | /* Redirect stdout to the pseudo tty. */ | |
626 | if (dup2(ttyfd, fileno(stdout)) < 0) | |
627 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
628 | ||
629 | /* Redirect stderr to the pseudo tty. */ | |
630 | if (dup2(ttyfd, fileno(stderr)) < 0) | |
631 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
632 | ||
633 | /* Close the extra descriptor for the pseudo tty. */ | |
634 | close(ttyfd); | |
635 | ||
c345cf9d | 636 | /* record login, etc. similar to login(1) */ |
a22aff1f | 637 | if (!(options.use_login && command == NULL)) |
638 | do_login(s, command); | |
7368a6c8 | 639 | |
7368a6c8 | 640 | /* Do common processing for the child, such as execing the command. */ |
71276795 | 641 | do_child(command, pw, s->term, s->display, s->auth_proto, |
642 | s->auth_data, s->tty); | |
7368a6c8 | 643 | /* NOTREACHED */ |
644 | } | |
3c62e7eb | 645 | #ifdef HAVE_CYGWIN |
646 | if (is_winnt) | |
647 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
648 | #endif | |
7368a6c8 | 649 | if (pid < 0) |
650 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
651 | s->pid = pid; | |
652 | ||
653 | /* Parent. Close the slave side of the pseudo tty. */ | |
654 | close(ttyfd); | |
655 | ||
656 | /* | |
657 | * Create another descriptor of the pty master side for use as the | |
658 | * standard input. We could use the original descriptor, but this | |
659 | * simplifies code in server_loop. The descriptor is bidirectional. | |
660 | */ | |
661 | fdout = dup(ptyfd); | |
662 | if (fdout < 0) | |
663 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
664 | ||
665 | /* we keep a reference to the pty master */ | |
666 | ptymaster = dup(ptyfd); | |
667 | if (ptymaster < 0) | |
668 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
669 | s->ptymaster = ptymaster; | |
670 | ||
671 | /* Enter interactive session. */ | |
b5c334cc | 672 | packet_set_interactive(1); |
e78a59f5 | 673 | if (compat20) { |
674 | session_set_fds(s, ptyfd, fdout, -1); | |
675 | } else { | |
676 | server_loop(pid, ptyfd, fdout, -1); | |
677 | /* server_loop _has_ closed ptyfd and fdout. */ | |
678 | session_pty_cleanup(s); | |
679 | } | |
7368a6c8 | 680 | } |
681 | ||
c345cf9d | 682 | const char * |
683 | get_remote_name_or_ip(void) | |
684 | { | |
685 | static const char *remote = ""; | |
686 | if (utmp_len > 0) | |
61e96248 | 687 | remote = get_canonical_hostname(options.reverse_mapping_check); |
c345cf9d | 688 | if (utmp_len == 0 || strlen(remote) > utmp_len) |
689 | remote = get_remote_ipaddr(); | |
690 | return remote; | |
691 | } | |
692 | ||
693 | /* administrative, login(1)-like work */ | |
694 | void | |
a22aff1f | 695 | do_login(Session *s, const char *command) |
c345cf9d | 696 | { |
697 | FILE *f; | |
698 | char *time_string; | |
699 | char buf[256]; | |
b5e300c2 | 700 | char hostname[MAXHOSTNAMELEN]; |
c345cf9d | 701 | socklen_t fromlen; |
702 | struct sockaddr_storage from; | |
703 | struct stat st; | |
704 | time_t last_login_time; | |
705 | struct passwd * pw = s->pw; | |
706 | pid_t pid = getpid(); | |
707 | ||
708 | /* | |
709 | * Get IP address of client. If the connection is not a socket, let | |
710 | * the address be 0.0.0.0. | |
711 | */ | |
712 | memset(&from, 0, sizeof(from)); | |
713 | if (packet_connection_is_on_socket()) { | |
714 | fromlen = sizeof(from); | |
715 | if (getpeername(packet_get_connection_in(), | |
716 | (struct sockaddr *) & from, &fromlen) < 0) { | |
717 | debug("getpeername: %.100s", strerror(errno)); | |
718 | fatal_cleanup(); | |
719 | } | |
720 | } | |
721 | ||
bcbf86ec | 722 | /* Get the time and hostname when the user last logged in. */ |
723 | hostname[0] = '\0'; | |
724 | last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name, | |
725 | hostname, sizeof(hostname)); | |
726 | ||
c345cf9d | 727 | /* Record that there was a login on that tty from the remote host. */ |
728 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
729 | get_remote_name_or_ip(), (struct sockaddr *)&from); | |
730 | ||
2919e060 | 731 | #ifdef USE_PAM |
732 | /* | |
733 | * If password change is needed, do it now. | |
734 | * This needs to occur before the ~/.hushlogin check. | |
735 | */ | |
736 | if (pam_password_change_required()) { | |
737 | print_pam_messages(); | |
738 | do_pam_chauthtok(); | |
739 | } | |
740 | #endif | |
741 | ||
a22aff1f | 742 | /* Done if .hushlogin exists or a command given. */ |
743 | if (command != NULL) | |
744 | return; | |
c345cf9d | 745 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); |
2e73a022 | 746 | #ifdef HAVE_LOGIN_CAP |
747 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
748 | #else | |
c345cf9d | 749 | if (stat(buf, &st) >= 0) |
2e73a022 | 750 | #endif |
c345cf9d | 751 | return; |
752 | ||
753 | #ifdef USE_PAM | |
2919e060 | 754 | if (!pam_password_change_required()) |
755 | print_pam_messages(); | |
c345cf9d | 756 | #endif /* USE_PAM */ |
757 | #ifdef WITH_AIXAUTHENTICATE | |
758 | if (aixloginmsg && *aixloginmsg) | |
759 | printf("%s\n", aixloginmsg); | |
760 | #endif /* WITH_AIXAUTHENTICATE */ | |
761 | ||
c345cf9d | 762 | if (last_login_time != 0) { |
763 | time_string = ctime(&last_login_time); | |
764 | if (strchr(time_string, '\n')) | |
765 | *strchr(time_string, '\n') = 0; | |
f478712e | 766 | if (strcmp(hostname, "") == 0) |
c345cf9d | 767 | printf("Last login: %s\r\n", time_string); |
768 | else | |
bcbf86ec | 769 | printf("Last login: %s from %s\r\n", time_string, hostname); |
c345cf9d | 770 | } |
771 | if (options.print_motd) { | |
2e73a022 | 772 | #ifdef HAVE_LOGIN_CAP |
773 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
774 | "/etc/motd"), "r"); | |
775 | #else | |
c345cf9d | 776 | f = fopen("/etc/motd", "r"); |
2e73a022 | 777 | #endif |
c345cf9d | 778 | if (f) { |
779 | while (fgets(buf, sizeof(buf), f)) | |
780 | fputs(buf, stdout); | |
781 | fclose(f); | |
782 | } | |
783 | } | |
784 | } | |
785 | ||
7368a6c8 | 786 | /* |
787 | * Sets the value of the given variable in the environment. If the variable | |
788 | * already exists, its value is overriden. | |
789 | */ | |
6ae2364d | 790 | void |
1e3b8b07 | 791 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
7368a6c8 | 792 | const char *value) |
793 | { | |
1e3b8b07 | 794 | u_int i, namelen; |
7368a6c8 | 795 | char **env; |
796 | ||
797 | /* | |
798 | * Find the slot where the value should be stored. If the variable | |
799 | * already exists, we reuse the slot; otherwise we append a new slot | |
800 | * at the end of the array, expanding if necessary. | |
801 | */ | |
802 | env = *envp; | |
803 | namelen = strlen(name); | |
804 | for (i = 0; env[i]; i++) | |
805 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
806 | break; | |
807 | if (env[i]) { | |
808 | /* Reuse the slot. */ | |
809 | xfree(env[i]); | |
810 | } else { | |
811 | /* New variable. Expand if necessary. */ | |
812 | if (i >= (*envsizep) - 1) { | |
813 | (*envsizep) += 50; | |
814 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
815 | } | |
816 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
817 | env[i + 1] = NULL; | |
818 | } | |
819 | ||
820 | /* Allocate space and format the variable in the appropriate slot. */ | |
821 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
822 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
823 | } | |
824 | ||
825 | /* | |
826 | * Reads environment variables from the given file and adds/overrides them | |
827 | * into the environment. If the file does not exist, this does nothing. | |
828 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
829 | * and assignments of the form name=value. No other forms are allowed. | |
830 | */ | |
6ae2364d | 831 | void |
1e3b8b07 | 832 | read_environment_file(char ***env, u_int *envsize, |
7368a6c8 | 833 | const char *filename) |
834 | { | |
835 | FILE *f; | |
836 | char buf[4096]; | |
837 | char *cp, *value; | |
838 | ||
839 | f = fopen(filename, "r"); | |
840 | if (!f) | |
841 | return; | |
842 | ||
843 | while (fgets(buf, sizeof(buf), f)) { | |
844 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
845 | ; | |
846 | if (!*cp || *cp == '#' || *cp == '\n') | |
847 | continue; | |
848 | if (strchr(cp, '\n')) | |
849 | *strchr(cp, '\n') = '\0'; | |
850 | value = strchr(cp, '='); | |
851 | if (value == NULL) { | |
852 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
853 | continue; | |
854 | } | |
71276795 | 855 | /* |
856 | * Replace the equals sign by nul, and advance value to | |
857 | * the value string. | |
858 | */ | |
7368a6c8 | 859 | *value = '\0'; |
860 | value++; | |
861 | child_set_env(env, envsize, cp, value); | |
862 | } | |
863 | fclose(f); | |
864 | } | |
865 | ||
866 | #ifdef USE_PAM | |
867 | /* | |
868 | * Sets any environment variables which have been specified by PAM | |
869 | */ | |
870 | void do_pam_environment(char ***env, int *envsize) | |
871 | { | |
872 | char *equals, var_name[512], var_val[512]; | |
873 | char **pam_env; | |
874 | int i; | |
875 | ||
876 | if ((pam_env = fetch_pam_environment()) == NULL) | |
877 | return; | |
2b87da3b | 878 | |
7368a6c8 | 879 | for(i = 0; pam_env[i] != NULL; i++) { |
880 | if ((equals = strstr(pam_env[i], "=")) == NULL) | |
881 | continue; | |
2b87da3b | 882 | |
7368a6c8 | 883 | if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) { |
884 | memset(var_name, '\0', sizeof(var_name)); | |
885 | memset(var_val, '\0', sizeof(var_val)); | |
886 | ||
887 | strncpy(var_name, pam_env[i], equals - pam_env[i]); | |
888 | strcpy(var_val, equals + 1); | |
889 | ||
22d89d24 | 890 | debug3("PAM environment: %s=%s", var_name, var_val); |
7368a6c8 | 891 | |
892 | child_set_env(env, envsize, var_name, var_val); | |
893 | } | |
894 | } | |
895 | } | |
896 | #endif /* USE_PAM */ | |
897 | ||
22d89d24 | 898 | |
899 | #ifdef HAVE_CYGWIN | |
900 | void copy_environment(char ***env, int *envsize) | |
901 | { | |
902 | char *equals, var_name[512], var_val[512]; | |
903 | int i; | |
904 | ||
905 | for(i = 0; environ[i] != NULL; i++) { | |
906 | if ((equals = strstr(environ[i], "=")) == NULL) | |
907 | continue; | |
2b87da3b | 908 | |
22d89d24 | 909 | if (strlen(environ[i]) < (sizeof(var_name) - 1)) { |
910 | memset(var_name, '\0', sizeof(var_name)); | |
911 | memset(var_val, '\0', sizeof(var_val)); | |
912 | ||
913 | strncpy(var_name, environ[i], equals - environ[i]); | |
914 | strcpy(var_val, equals + 1); | |
915 | ||
916 | debug3("Copy environment: %s=%s", var_name, var_val); | |
917 | ||
918 | child_set_env(env, envsize, var_name, var_val); | |
919 | } | |
920 | } | |
921 | } | |
922 | #endif | |
923 | ||
5fa45897 | 924 | #if defined(HAVE_GETUSERATTR) |
925 | /* | |
926 | * AIX-specific login initialisation | |
927 | */ | |
928 | void set_limit(char *user, char *soft, char *hard, int resource, int mult) | |
929 | { | |
930 | struct rlimit rlim; | |
56118702 | 931 | int slim, hlim; |
5fa45897 | 932 | |
933 | getrlimit(resource, &rlim); | |
934 | ||
56118702 | 935 | slim = 0; |
936 | if (getuserattr(user, soft, &slim, SEC_INT) != -1) { | |
937 | if (slim < 0) { | |
938 | rlim.rlim_cur = RLIM_INFINITY; | |
939 | } else if (slim != 0) { | |
940 | /* See the wackiness below */ | |
941 | if (rlim.rlim_cur == slim * mult) | |
942 | slim = 0; | |
943 | else | |
944 | rlim.rlim_cur = slim * mult; | |
945 | } | |
946 | } | |
5fa45897 | 947 | |
56118702 | 948 | hlim = 0; |
949 | if (getuserattr(user, hard, &hlim, SEC_INT) != -1) { | |
950 | if (hlim < 0) { | |
951 | rlim.rlim_max = RLIM_INFINITY; | |
952 | } else if (hlim != 0) { | |
953 | rlim.rlim_max = hlim * mult; | |
954 | } | |
955 | } | |
5fa45897 | 956 | |
56118702 | 957 | /* |
958 | * XXX For cpu and fsize the soft limit is set to the hard limit | |
959 | * if the hard limit is left at its default value and the soft limit | |
960 | * is changed from its default value, either by requesting it | |
961 | * (slim == 0) or by setting it to the current default. At least | |
962 | * that's how rlogind does it. If you're confused you're not alone. | |
963 | * Bug or feature? AIX 4.3.1.2 | |
964 | */ | |
965 | if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu")) | |
966 | && hlim == 0 && slim != 0) | |
967 | rlim.rlim_max = rlim.rlim_cur; | |
968 | /* A specified hard limit limits the soft limit */ | |
969 | else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max) | |
970 | rlim.rlim_cur = rlim.rlim_max; | |
971 | /* A soft limit can increase a hard limit */ | |
972 | else if (rlim.rlim_cur > rlim.rlim_max) | |
5fa45897 | 973 | rlim.rlim_max = rlim.rlim_cur; |
974 | ||
975 | if (setrlimit(resource, &rlim) != 0) | |
56118702 | 976 | error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno)); |
5fa45897 | 977 | } |
978 | ||
979 | void set_limits_from_userattr(char *user) | |
980 | { | |
981 | int mask; | |
982 | char buf[16]; | |
983 | ||
984 | set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512); | |
985 | set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1); | |
986 | set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512); | |
987 | set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512); | |
988 | set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512); | |
989 | set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512); | |
990 | #if defined(S_UNOFILE) | |
991 | set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1); | |
992 | #endif | |
993 | ||
994 | if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) { | |
995 | /* Convert decimal to octal */ | |
996 | (void) snprintf(buf, sizeof(buf), "%d", mask); | |
997 | if (sscanf(buf, "%o", &mask) == 1) | |
998 | umask(mask); | |
999 | } | |
1000 | } | |
1001 | #endif /* defined(HAVE_GETUSERATTR) */ | |
1002 | ||
7368a6c8 | 1003 | /* |
1004 | * Performs common processing for the child, such as setting up the | |
1005 | * environment, closing extra file descriptors, setting the user and group | |
1006 | * ids, and executing the command or shell. | |
1007 | */ | |
6ae2364d | 1008 | void |
7368a6c8 | 1009 | do_child(const char *command, struct passwd * pw, const char *term, |
1010 | const char *display, const char *auth_proto, | |
1011 | const char *auth_data, const char *ttyname) | |
1012 | { | |
b5e300c2 | 1013 | const char *shell, *hostname = NULL, *cp = NULL; |
7368a6c8 | 1014 | char buf[256]; |
6fc1e9f3 | 1015 | char cmd[1024]; |
2e73a022 | 1016 | FILE *f = NULL; |
1e3b8b07 | 1017 | u_int envsize, i; |
7368a6c8 | 1018 | char **env; |
1019 | extern char **environ; | |
1020 | struct stat st; | |
1021 | char *argv[10]; | |
3206bb3b | 1022 | #ifdef WITH_IRIX_PROJECT |
1023 | prid_t projid; | |
1024 | #endif /* WITH_IRIX_PROJECT */ | |
d287c664 | 1025 | #ifdef WITH_IRIX_JOBS |
1026 | jid_t jid = 0; | |
1027 | #else | |
1028 | #ifdef WITH_IRIX_ARRAY | |
1029 | int jid = 0; | |
1030 | #endif /* WITH_IRIX_ARRAY */ | |
1031 | #endif /* WITH_IRIX_JOBS */ | |
1032 | ||
7368a6c8 | 1033 | |
fa649821 | 1034 | /* login(1) is only called if we execute the login shell */ |
1035 | if (options.use_login && command != NULL) | |
1036 | options.use_login = 0; | |
1037 | ||
7368a6c8 | 1038 | #ifndef USE_PAM /* pam_nologin handles this */ |
2e73a022 | 1039 | if (!options.use_login) { |
1040 | # ifdef HAVE_LOGIN_CAP | |
1041 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1042 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1043 | _PATH_NOLOGIN), "r"); | |
1044 | # else /* HAVE_LOGIN_CAP */ | |
1045 | if (pw->pw_uid) | |
1046 | f = fopen(_PATH_NOLOGIN, "r"); | |
1047 | # endif /* HAVE_LOGIN_CAP */ | |
1048 | if (f) { | |
1049 | /* /etc/nologin exists. Print its contents and exit. */ | |
1050 | while (fgets(buf, sizeof(buf), f)) | |
1051 | fputs(buf, stderr); | |
1052 | fclose(f); | |
7368a6c8 | 1053 | exit(254); |
2e73a022 | 1054 | } |
7368a6c8 | 1055 | } |
1056 | #endif /* USE_PAM */ | |
1057 | ||
2e73a022 | 1058 | /* Set login name, uid, gid, and groups. */ |
7368a6c8 | 1059 | /* Login(1) does this as well, and it needs uid 0 for the "-h" |
1060 | switch, so we let login(1) to this for us. */ | |
1061 | if (!options.use_login) { | |
4d33e531 | 1062 | #ifdef HAVE_OSF_SIA |
1063 | extern char **saved_argv; | |
1064 | extern int saved_argc; | |
61e96248 | 1065 | char *host = get_canonical_hostname(options.reverse_mapping_check); |
4d33e531 | 1066 | |
1067 | if (sia_become_user(NULL, saved_argc, saved_argv, host, | |
1068 | pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) != | |
1069 | SIASUCCESS) { | |
1070 | perror("sia_become_user"); | |
1071 | exit(1); | |
1072 | } | |
1073 | if (setreuid(geteuid(), geteuid()) < 0) { | |
1074 | perror("setreuid"); | |
1075 | exit(1); | |
1076 | } | |
1077 | #else /* HAVE_OSF_SIA */ | |
3c62e7eb | 1078 | #ifdef HAVE_CYGWIN |
1079 | if (is_winnt) { | |
1080 | #else | |
7368a6c8 | 1081 | if (getuid() == 0 || geteuid() == 0) { |
3c62e7eb | 1082 | #endif |
2e73a022 | 1083 | # ifdef HAVE_GETUSERATTR |
5fa45897 | 1084 | set_limits_from_userattr(pw->pw_name); |
2e73a022 | 1085 | # endif /* HAVE_GETUSERATTR */ |
1086 | # ifdef HAVE_LOGIN_CAP | |
1087 | if (setusercontext(lc, pw, pw->pw_uid, | |
1088 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1089 | perror("unable to set user context"); | |
1090 | exit(1); | |
1091 | } | |
1092 | # else /* HAVE_LOGIN_CAP */ | |
1093 | if (setlogin(pw->pw_name) < 0) | |
1094 | error("setlogin failed: %s", strerror(errno)); | |
7368a6c8 | 1095 | if (setgid(pw->pw_gid) < 0) { |
1096 | perror("setgid"); | |
1097 | exit(1); | |
1098 | } | |
1099 | /* Initialize the group list. */ | |
1100 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1101 | perror("initgroups"); | |
1102 | exit(1); | |
1103 | } | |
1104 | endgrent(); | |
d287c664 | 1105 | # ifdef WITH_IRIX_JOBS |
1106 | jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive"); | |
1107 | if (jid == -1) { | |
1108 | fatal("Failed to create job container: %.100s", | |
1109 | strerror(errno)); | |
2b87da3b | 1110 | } |
d287c664 | 1111 | # endif /* WITH_IRIX_JOBS */ |
2e73a022 | 1112 | # ifdef WITH_IRIX_ARRAY |
3206bb3b | 1113 | /* initialize array session */ |
d287c664 | 1114 | if (jid == 0) { |
1115 | if (newarraysess() != 0) | |
1116 | fatal("Failed to set up new array session: %.100s", | |
1117 | strerror(errno)); | |
1118 | } | |
2e73a022 | 1119 | # endif /* WITH_IRIX_ARRAY */ |
1120 | # ifdef WITH_IRIX_PROJECT | |
3206bb3b | 1121 | /* initialize irix project info */ |
1122 | if ((projid = getdfltprojuser(pw->pw_name)) == -1) { | |
1123 | debug("Failed to get project id, using projid 0"); | |
1124 | projid = 0; | |
1125 | } | |
3206bb3b | 1126 | if (setprid(projid)) |
1127 | fatal("Failed to initialize project %d for %s: %.100s", | |
1128 | (int)projid, pw->pw_name, strerror(errno)); | |
2e73a022 | 1129 | # endif /* WITH_IRIX_PROJECT */ |
260d427b | 1130 | #ifdef WITH_IRIX_AUDIT |
1131 | if (sysconf(_SC_AUDIT)) { | |
1132 | debug("Setting sat id to %d", (int) pw->pw_uid); | |
1133 | if (satsetid(pw->pw_uid)) | |
1134 | debug("error setting satid: %.100s", strerror(errno)); | |
1135 | } | |
1136 | #endif /* WITH_IRIX_AUDIT */ | |
1137 | ||
7368a6c8 | 1138 | /* Permanently switch to the desired uid. */ |
1139 | permanently_set_uid(pw->pw_uid); | |
2e73a022 | 1140 | # endif /* HAVE_LOGIN_CAP */ |
7368a6c8 | 1141 | } |
2e73a022 | 1142 | #endif /* HAVE_OSF_SIA */ |
1143 | ||
3c62e7eb | 1144 | #ifdef HAVE_CYGWIN |
1145 | if (is_winnt) | |
1146 | #endif | |
7368a6c8 | 1147 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
14a9a859 | 1148 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
7368a6c8 | 1149 | } |
1150 | /* | |
1151 | * Get the shell from the password data. An empty shell field is | |
1152 | * legal, and means /bin/sh. | |
1153 | */ | |
1154 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
2e73a022 | 1155 | #ifdef HAVE_LOGIN_CAP |
1156 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1157 | #endif | |
7368a6c8 | 1158 | |
1159 | #ifdef AFS | |
1160 | /* Try to get AFS tokens for the local cell. */ | |
1161 | if (k_hasafs()) { | |
1162 | char cell[64]; | |
1163 | ||
1164 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1165 | krb_afslog(cell, 0); | |
1166 | ||
1167 | krb_afslog(0, 0); | |
1168 | } | |
1169 | #endif /* AFS */ | |
1170 | ||
1171 | /* Initialize the environment. */ | |
1172 | envsize = 100; | |
1173 | env = xmalloc(envsize * sizeof(char *)); | |
1174 | env[0] = NULL; | |
1175 | ||
3c62e7eb | 1176 | #ifdef HAVE_CYGWIN |
1177 | /* | |
1178 | * The Windows environment contains some setting which are | |
1179 | * important for a running system. They must not be dropped. | |
1180 | */ | |
22d89d24 | 1181 | copy_environment(&env, &envsize); |
3c62e7eb | 1182 | #endif |
1183 | ||
7368a6c8 | 1184 | if (!options.use_login) { |
1185 | /* Set basic environment. */ | |
1186 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1187 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1188 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
2e73a022 | 1189 | #ifdef HAVE_LOGIN_CAP |
1190 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH); | |
1191 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1192 | #else /* HAVE_LOGIN_CAP */ |
1193 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1194 | /* |
1195 | * There's no standard path on Windows. The path contains | |
1196 | * important components pointing to the system directories, | |
1197 | * needed for loading shared libraries. So the path better | |
1198 | * remains intact here. | |
1199 | */ | |
7368a6c8 | 1200 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
22d89d24 | 1201 | # endif /* HAVE_CYGWIN */ |
1202 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1203 | |
1204 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1205 | _PATH_MAILDIR, pw->pw_name); | |
1206 | child_set_env(&env, &envsize, "MAIL", buf); | |
1207 | ||
1208 | /* Normal systems set SHELL by default. */ | |
1209 | child_set_env(&env, &envsize, "SHELL", shell); | |
1210 | } | |
1211 | if (getenv("TZ")) | |
1212 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1213 | ||
1214 | /* Set custom environment options from RSA authentication. */ | |
1215 | while (custom_environment) { | |
1216 | struct envstring *ce = custom_environment; | |
1217 | char *s = ce->s; | |
1218 | int i; | |
1219 | for (i = 0; s[i] != '=' && s[i]; i++); | |
1220 | if (s[i] == '=') { | |
1221 | s[i] = 0; | |
1222 | child_set_env(&env, &envsize, s, s + i + 1); | |
1223 | } | |
1224 | custom_environment = ce->next; | |
1225 | xfree(ce->s); | |
1226 | xfree(ce); | |
1227 | } | |
1228 | ||
1229 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
1230 | get_remote_ipaddr(), get_remote_port(), get_local_port()); | |
1231 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); | |
1232 | ||
1233 | if (ttyname) | |
1234 | child_set_env(&env, &envsize, "SSH_TTY", ttyname); | |
1235 | if (term) | |
1236 | child_set_env(&env, &envsize, "TERM", term); | |
1237 | if (display) | |
1238 | child_set_env(&env, &envsize, "DISPLAY", display); | |
b5e300c2 | 1239 | if (original_command) |
1240 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1241 | original_command); | |
7368a6c8 | 1242 | |
1243 | #ifdef _AIX | |
22d89d24 | 1244 | if ((cp = getenv("AUTHSTATE")) != NULL) |
1245 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1246 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1247 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1248 | read_environment_file(&env, &envsize, "/etc/environment"); | |
7368a6c8 | 1249 | #endif |
1250 | ||
1251 | #ifdef KRB4 | |
1252 | { | |
1253 | extern char *ticket; | |
1254 | ||
1255 | if (ticket) | |
1256 | child_set_env(&env, &envsize, "KRBTKFILE", ticket); | |
1257 | } | |
1258 | #endif /* KRB4 */ | |
1259 | ||
1260 | #ifdef USE_PAM | |
1261 | /* Pull in any environment variables that may have been set by PAM. */ | |
1262 | do_pam_environment(&env, &envsize); | |
1263 | #endif /* USE_PAM */ | |
1264 | ||
7368a6c8 | 1265 | if (xauthfile) |
1266 | child_set_env(&env, &envsize, "XAUTHORITY", xauthfile); | |
1267 | if (auth_get_socket_name() != NULL) | |
1268 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, | |
1269 | auth_get_socket_name()); | |
1270 | ||
1271 | /* read $HOME/.ssh/environment. */ | |
1272 | if (!options.use_login) { | |
71276795 | 1273 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1274 | pw->pw_dir); | |
7368a6c8 | 1275 | read_environment_file(&env, &envsize, buf); |
1276 | } | |
1277 | if (debug_flag) { | |
1278 | /* dump the environment */ | |
1279 | fprintf(stderr, "Environment:\n"); | |
1280 | for (i = 0; env[i]; i++) | |
1281 | fprintf(stderr, " %.200s\n", env[i]); | |
1282 | } | |
2e73a022 | 1283 | /* we have to stash the hostname before we close our socket. */ |
1284 | if (options.use_login) | |
1285 | hostname = get_remote_name_or_ip(); | |
7368a6c8 | 1286 | /* |
1287 | * Close the connection descriptors; note that this is the child, and | |
1288 | * the server will still have the socket open, and it is important | |
1289 | * that we do not shutdown it. Note that the descriptors cannot be | |
1290 | * closed before building the environment, as we call | |
1291 | * get_remote_ipaddr there. | |
1292 | */ | |
1293 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1294 | close(packet_get_connection_in()); | |
1295 | else { | |
1296 | close(packet_get_connection_in()); | |
1297 | close(packet_get_connection_out()); | |
1298 | } | |
1299 | /* | |
1300 | * Close all descriptors related to channels. They will still remain | |
1301 | * open in the parent. | |
1302 | */ | |
1303 | /* XXX better use close-on-exec? -markus */ | |
1304 | channel_close_all(); | |
1305 | ||
1306 | /* | |
1307 | * Close any extra file descriptors. Note that there may still be | |
1308 | * descriptors left by system functions. They will be closed later. | |
1309 | */ | |
1310 | endpwent(); | |
1311 | ||
1312 | /* | |
1313 | * Close any extra open file descriptors so that we don\'t have them | |
1314 | * hanging around in clients. Note that we want to do this after | |
1315 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1316 | * descriptors open. | |
1317 | */ | |
1318 | for (i = 3; i < 64; i++) | |
1319 | close(i); | |
1320 | ||
1321 | /* Change current directory to the user\'s home directory. */ | |
2e73a022 | 1322 | if (chdir(pw->pw_dir) < 0) { |
7368a6c8 | 1323 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", |
1324 | pw->pw_dir, strerror(errno)); | |
2e73a022 | 1325 | #ifdef HAVE_LOGIN_CAP |
1326 | if (login_getcapbool(lc, "requirehome", 0)) | |
1327 | exit(1); | |
1328 | #endif | |
1329 | } | |
7368a6c8 | 1330 | |
1331 | /* | |
1332 | * Must take new environment into use so that .ssh/rc, /etc/sshrc and | |
1333 | * xauth are run in the proper environment. | |
1334 | */ | |
1335 | environ = env; | |
1336 | ||
1337 | /* | |
1338 | * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first | |
1339 | * in this order). | |
1340 | */ | |
1341 | if (!options.use_login) { | |
42f11eb2 | 1342 | if (stat(_PATH_SSH_USER_RC, &st) >= 0) { |
7368a6c8 | 1343 | if (debug_flag) |
42f11eb2 | 1344 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, _PATH_SSH_USER_RC); |
7368a6c8 | 1345 | |
42f11eb2 | 1346 | f = popen(_PATH_BSHELL " " _PATH_SSH_USER_RC, "w"); |
7368a6c8 | 1347 | if (f) { |
1348 | if (auth_proto != NULL && auth_data != NULL) | |
1349 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1350 | pclose(f); | |
1351 | } else | |
42f11eb2 | 1352 | fprintf(stderr, "Could not run %s\n", _PATH_SSH_USER_RC); |
1353 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
7368a6c8 | 1354 | if (debug_flag) |
42f11eb2 | 1355 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, _PATH_SSH_SYSTEM_RC); |
7368a6c8 | 1356 | |
42f11eb2 | 1357 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); |
7368a6c8 | 1358 | if (f) { |
1359 | if (auth_proto != NULL && auth_data != NULL) | |
1360 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1361 | pclose(f); | |
1362 | } else | |
42f11eb2 | 1363 | fprintf(stderr, "Could not run %s\n", _PATH_SSH_SYSTEM_RC); |
6fc1e9f3 | 1364 | } else if (options.xauth_location != NULL) { |
7368a6c8 | 1365 | /* Add authority data to .Xauthority if appropriate. */ |
1366 | if (auth_proto != NULL && auth_data != NULL) { | |
29611d9c | 1367 | char *screen = strchr(display, ':'); |
1368 | if (debug_flag) { | |
71276795 | 1369 | fprintf(stderr, |
1370 | "Running %.100s add %.100s %.100s %.100s\n", | |
6fc1e9f3 | 1371 | options.xauth_location, display, |
1372 | auth_proto, auth_data); | |
7322ef0e | 1373 | #ifndef HAVE_CYGWIN /* Unix sockets are not supported */ |
29611d9c | 1374 | if (screen != NULL) |
71276795 | 1375 | fprintf(stderr, |
1376 | "Adding %.*s/unix%s %s %s\n", | |
14a9a859 | 1377 | (int)(screen-display), display, |
71276795 | 1378 | screen, auth_proto, auth_data); |
7322ef0e | 1379 | #endif |
29611d9c | 1380 | } |
6fc1e9f3 | 1381 | snprintf(cmd, sizeof cmd, "%s -q -", |
1382 | options.xauth_location); | |
1383 | f = popen(cmd, "w"); | |
7368a6c8 | 1384 | if (f) { |
71276795 | 1385 | fprintf(f, "add %s %s %s\n", display, |
1386 | auth_proto, auth_data); | |
7322ef0e | 1387 | #ifndef HAVE_CYGWIN /* Unix sockets are not supported */ |
2b87da3b | 1388 | if (screen != NULL) |
29611d9c | 1389 | fprintf(f, "add %.*s/unix%s %s %s\n", |
14a9a859 | 1390 | (int)(screen-display), display, |
71276795 | 1391 | screen, auth_proto, auth_data); |
7322ef0e | 1392 | #endif |
7368a6c8 | 1393 | pclose(f); |
6fc1e9f3 | 1394 | } else { |
1395 | fprintf(stderr, "Could not run %s\n", | |
1396 | cmd); | |
1397 | } | |
7368a6c8 | 1398 | } |
1399 | } | |
7368a6c8 | 1400 | /* Get the last component of the shell name. */ |
1401 | cp = strrchr(shell, '/'); | |
1402 | if (cp) | |
1403 | cp++; | |
1404 | else | |
1405 | cp = shell; | |
1406 | } | |
1407 | /* | |
1408 | * If we have no command, execute the shell. In this case, the shell | |
1409 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1410 | * this is a login shell. | |
1411 | */ | |
1412 | if (!command) { | |
1413 | if (!options.use_login) { | |
1414 | char buf[256]; | |
1415 | ||
1416 | /* | |
1417 | * Check for mail if we have a tty and it was enabled | |
1418 | * in server options. | |
1419 | */ | |
1420 | if (ttyname && options.check_mail) { | |
1421 | char *mailbox; | |
1422 | struct stat mailstat; | |
1423 | mailbox = getenv("MAIL"); | |
1424 | if (mailbox != NULL) { | |
71276795 | 1425 | if (stat(mailbox, &mailstat) != 0 || |
1426 | mailstat.st_size == 0) | |
7368a6c8 | 1427 | printf("No mail.\n"); |
1428 | else if (mailstat.st_mtime < mailstat.st_atime) | |
1429 | printf("You have mail.\n"); | |
1430 | else | |
1431 | printf("You have new mail.\n"); | |
1432 | } | |
1433 | } | |
1434 | /* Start the shell. Set initial character to '-'. */ | |
1435 | buf[0] = '-'; | |
1436 | strncpy(buf + 1, cp, sizeof(buf) - 1); | |
1437 | buf[sizeof(buf) - 1] = 0; | |
1438 | ||
1439 | /* Execute the shell. */ | |
1440 | argv[0] = buf; | |
1441 | argv[1] = NULL; | |
1442 | execve(shell, argv, env); | |
1443 | ||
1444 | /* Executing the shell failed. */ | |
1445 | perror(shell); | |
1446 | exit(1); | |
1447 | ||
1448 | } else { | |
1449 | /* Launch login(1). */ | |
1450 | ||
2e73a022 | 1451 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
c345cf9d | 1452 | "-p", "-f", "--", pw->pw_name, NULL); |
7368a6c8 | 1453 | |
1454 | /* Login couldn't be executed, die. */ | |
1455 | ||
1456 | perror("login"); | |
1457 | exit(1); | |
1458 | } | |
1459 | } | |
1460 | /* | |
1461 | * Execute the command using the user's shell. This uses the -c | |
1462 | * option to execute the command. | |
1463 | */ | |
1464 | argv[0] = (char *) cp; | |
1465 | argv[1] = "-c"; | |
1466 | argv[2] = (char *) command; | |
1467 | argv[3] = NULL; | |
1468 | execve(shell, argv, env); | |
1469 | perror(shell); | |
1470 | exit(1); | |
1471 | } | |
1472 | ||
1473 | Session * | |
1474 | session_new(void) | |
1475 | { | |
1476 | int i; | |
1477 | static int did_init = 0; | |
1478 | if (!did_init) { | |
1479 | debug("session_new: init"); | |
1480 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1481 | sessions[i].used = 0; | |
1482 | sessions[i].self = i; | |
1483 | } | |
1484 | did_init = 1; | |
1485 | } | |
1486 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1487 | Session *s = &sessions[i]; | |
1488 | if (! s->used) { | |
1489 | s->pid = 0; | |
0b242b12 | 1490 | s->extended = 0; |
7368a6c8 | 1491 | s->chanid = -1; |
1492 | s->ptyfd = -1; | |
1493 | s->ttyfd = -1; | |
1494 | s->term = NULL; | |
1495 | s->pw = NULL; | |
1496 | s->display = NULL; | |
1497 | s->screen = 0; | |
1498 | s->auth_data = NULL; | |
1499 | s->auth_proto = NULL; | |
1500 | s->used = 1; | |
0b242b12 | 1501 | s->pw = NULL; |
02323c45 | 1502 | debug("session_new: session %d", i); |
7368a6c8 | 1503 | return s; |
1504 | } | |
1505 | } | |
1506 | return NULL; | |
1507 | } | |
1508 | ||
1509 | void | |
1510 | session_dump(void) | |
1511 | { | |
1512 | int i; | |
1513 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1514 | Session *s = &sessions[i]; | |
1515 | debug("dump: used %d session %d %p channel %d pid %d", | |
1516 | s->used, | |
1517 | s->self, | |
1518 | s, | |
1519 | s->chanid, | |
1520 | s->pid); | |
1521 | } | |
1522 | } | |
1523 | ||
e78a59f5 | 1524 | int |
1525 | session_open(int chanid) | |
1526 | { | |
1527 | Session *s = session_new(); | |
1528 | debug("session_open: channel %d", chanid); | |
1529 | if (s == NULL) { | |
1530 | error("no more sessions"); | |
1531 | return 0; | |
1532 | } | |
e78a59f5 | 1533 | s->pw = auth_get_user(); |
1534 | if (s->pw == NULL) | |
0b242b12 | 1535 | fatal("no user for session %i", s->self); |
1536 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1537 | s->chanid = chanid; | |
e78a59f5 | 1538 | return 1; |
1539 | } | |
1540 | ||
1541 | Session * | |
1542 | session_by_channel(int id) | |
1543 | { | |
1544 | int i; | |
1545 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1546 | Session *s = &sessions[i]; | |
1547 | if (s->used && s->chanid == id) { | |
1548 | debug("session_by_channel: session %d channel %d", i, id); | |
1549 | return s; | |
1550 | } | |
1551 | } | |
1552 | debug("session_by_channel: unknown channel %d", id); | |
1553 | session_dump(); | |
1554 | return NULL; | |
1555 | } | |
1556 | ||
1557 | Session * | |
1558 | session_by_pid(pid_t pid) | |
1559 | { | |
1560 | int i; | |
1561 | debug("session_by_pid: pid %d", pid); | |
1562 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1563 | Session *s = &sessions[i]; | |
1564 | if (s->used && s->pid == pid) | |
1565 | return s; | |
1566 | } | |
1567 | error("session_by_pid: unknown pid %d", pid); | |
1568 | session_dump(); | |
1569 | return NULL; | |
1570 | } | |
1571 | ||
1572 | int | |
1573 | session_window_change_req(Session *s) | |
1574 | { | |
1575 | s->col = packet_get_int(); | |
1576 | s->row = packet_get_int(); | |
1577 | s->xpixel = packet_get_int(); | |
1578 | s->ypixel = packet_get_int(); | |
6ae2364d | 1579 | packet_done(); |
e78a59f5 | 1580 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1581 | return 1; | |
1582 | } | |
1583 | ||
1584 | int | |
1585 | session_pty_req(Session *s) | |
1586 | { | |
1e3b8b07 | 1587 | u_int len; |
6ae2364d | 1588 | char *term_modes; /* encoded terminal modes */ |
e78a59f5 | 1589 | |
38c295d6 | 1590 | if (no_pty_flag) |
1591 | return 0; | |
e78a59f5 | 1592 | if (s->ttyfd != -1) |
6ae2364d | 1593 | return 0; |
e78a59f5 | 1594 | s->term = packet_get_string(&len); |
1595 | s->col = packet_get_int(); | |
1596 | s->row = packet_get_int(); | |
1597 | s->xpixel = packet_get_int(); | |
1598 | s->ypixel = packet_get_int(); | |
6ae2364d | 1599 | term_modes = packet_get_string(&len); |
1600 | packet_done(); | |
e78a59f5 | 1601 | |
1602 | if (strcmp(s->term, "") == 0) { | |
1603 | xfree(s->term); | |
1604 | s->term = NULL; | |
1605 | } | |
1606 | /* Allocate a pty and open it. */ | |
1607 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) { | |
1608 | xfree(s->term); | |
1609 | s->term = NULL; | |
1610 | s->ptyfd = -1; | |
1611 | s->ttyfd = -1; | |
1612 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1613 | xfree(term_modes); |
1614 | return 0; | |
e78a59f5 | 1615 | } |
1616 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1617 | /* | |
1618 | * Add a cleanup function to clear the utmp entry and record logout | |
1619 | * time in case we call fatal() (e.g., the connection gets closed). | |
1620 | */ | |
1621 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
1622 | pty_setowner(s->pw, s->tty); | |
1623 | /* Get window size from the packet. */ | |
1624 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1625 | ||
1d1ffb87 | 1626 | session_proctitle(s); |
1627 | ||
35484284 | 1628 | /* XXX parse and set terminal modes */ |
1629 | xfree(term_modes); | |
e78a59f5 | 1630 | return 1; |
1631 | } | |
1632 | ||
0b242b12 | 1633 | int |
1634 | session_subsystem_req(Session *s) | |
1635 | { | |
1e3b8b07 | 1636 | u_int len; |
0b242b12 | 1637 | int success = 0; |
1638 | char *subsys = packet_get_string(&len); | |
38c295d6 | 1639 | int i; |
0b242b12 | 1640 | |
1641 | packet_done(); | |
1642 | log("subsystem request for %s", subsys); | |
1643 | ||
38c295d6 | 1644 | for (i = 0; i < options.num_subsystems; i++) { |
1645 | if(strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1646 | debug("subsystem: exec() %s", options.subsystem_command[i]); | |
1647 | do_exec_no_pty(s, options.subsystem_command[i], s->pw); | |
1648 | success = 1; | |
1649 | } | |
1650 | } | |
1651 | ||
1652 | if (!success) | |
1653 | log("subsystem request for %s failed, subsystem not found", subsys); | |
1654 | ||
0b242b12 | 1655 | xfree(subsys); |
1656 | return success; | |
1657 | } | |
1658 | ||
1659 | int | |
1660 | session_x11_req(Session *s) | |
1661 | { | |
b5e300c2 | 1662 | int fd; |
089fbbd2 | 1663 | if (no_x11_forwarding_flag) { |
38c295d6 | 1664 | debug("X11 forwarding disabled in user configuration file."); |
1665 | return 0; | |
1666 | } | |
0b242b12 | 1667 | if (!options.x11_forwarding) { |
1668 | debug("X11 forwarding disabled in server configuration file."); | |
1669 | return 0; | |
1670 | } | |
1671 | if (xauthfile != NULL) { | |
1672 | debug("X11 fwd already started."); | |
1673 | return 0; | |
1674 | } | |
1675 | ||
1676 | debug("Received request for X11 forwarding with auth spoofing."); | |
1677 | if (s->display != NULL) | |
1678 | packet_disconnect("Protocol error: X11 display already set."); | |
1679 | ||
1680 | s->single_connection = packet_get_char(); | |
1681 | s->auth_proto = packet_get_string(NULL); | |
1682 | s->auth_data = packet_get_string(NULL); | |
1683 | s->screen = packet_get_int(); | |
1684 | packet_done(); | |
1685 | ||
1686 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
1687 | if (s->display == NULL) { | |
1688 | xfree(s->auth_proto); | |
1689 | xfree(s->auth_data); | |
1690 | return 0; | |
1691 | } | |
1692 | xauthfile = xmalloc(MAXPATHLEN); | |
1693 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
1694 | temporarily_use_uid(s->pw->pw_uid); | |
1695 | if (mkdtemp(xauthfile) == NULL) { | |
1696 | restore_uid(); | |
1697 | error("private X11 dir: mkdtemp %s failed: %s", | |
1698 | xauthfile, strerror(errno)); | |
1699 | xfree(xauthfile); | |
1700 | xauthfile = NULL; | |
1701 | xfree(s->auth_proto); | |
1702 | xfree(s->auth_data); | |
1703 | /* XXXX remove listening channels */ | |
1704 | return 0; | |
1705 | } | |
1706 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 1707 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
1708 | if (fd >= 0) | |
1709 | close(fd); | |
0b242b12 | 1710 | restore_uid(); |
1711 | fatal_add_cleanup(xauthfile_cleanup_proc, s); | |
1712 | return 1; | |
1713 | } | |
1714 | ||
38c295d6 | 1715 | int |
1716 | session_shell_req(Session *s) | |
1717 | { | |
1718 | /* if forced_command == NULL, the shell is execed */ | |
1719 | char *shell = forced_command; | |
1720 | packet_done(); | |
1721 | s->extended = 1; | |
1722 | if (s->ttyfd == -1) | |
1723 | do_exec_no_pty(s, shell, s->pw); | |
1724 | else | |
1725 | do_exec_pty(s, shell, s->pw); | |
1726 | return 1; | |
1727 | } | |
1728 | ||
1729 | int | |
1730 | session_exec_req(Session *s) | |
1731 | { | |
1e3b8b07 | 1732 | u_int len; |
38c295d6 | 1733 | char *command = packet_get_string(&len); |
1734 | packet_done(); | |
1735 | if (forced_command) { | |
b5e300c2 | 1736 | original_command = command; |
38c295d6 | 1737 | command = forced_command; |
1738 | debug("Forced command '%.500s'", forced_command); | |
1739 | } | |
1740 | s->extended = 1; | |
1741 | if (s->ttyfd == -1) | |
1742 | do_exec_no_pty(s, command, s->pw); | |
1743 | else | |
1744 | do_exec_pty(s, command, s->pw); | |
1745 | if (forced_command == NULL) | |
1746 | xfree(command); | |
1747 | return 1; | |
1748 | } | |
1749 | ||
fa08c86b | 1750 | int |
1751 | session_auth_agent_req(Session *s) | |
1752 | { | |
1753 | static int called = 0; | |
1754 | packet_done(); | |
d343d900 | 1755 | if (no_agent_forwarding_flag) { |
1756 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1757 | return 0; | |
1758 | } | |
fa08c86b | 1759 | if (called) { |
1760 | return 0; | |
1761 | } else { | |
1762 | called = 1; | |
1763 | return auth_input_request_forwarding(s->pw); | |
1764 | } | |
1765 | } | |
1766 | ||
e78a59f5 | 1767 | void |
1768 | session_input_channel_req(int id, void *arg) | |
1769 | { | |
1e3b8b07 | 1770 | u_int len; |
e78a59f5 | 1771 | int reply; |
1772 | int success = 0; | |
1773 | char *rtype; | |
1774 | Session *s; | |
1775 | Channel *c; | |
1776 | ||
1777 | rtype = packet_get_string(&len); | |
1778 | reply = packet_get_char(); | |
1779 | ||
1780 | s = session_by_channel(id); | |
1781 | if (s == NULL) | |
1782 | fatal("session_input_channel_req: channel %d: no session", id); | |
1783 | c = channel_lookup(id); | |
1784 | if (c == NULL) | |
1785 | fatal("session_input_channel_req: channel %d: bad channel", id); | |
1786 | ||
1787 | debug("session_input_channel_req: session %d channel %d request %s reply %d", | |
1788 | s->self, id, rtype, reply); | |
1789 | ||
1790 | /* | |
1791 | * a session is in LARVAL state until a shell | |
1792 | * or programm is executed | |
1793 | */ | |
1794 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1795 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1796 | success = session_shell_req(s); |
e78a59f5 | 1797 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1798 | success = session_exec_req(s); |
e78a59f5 | 1799 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1800 | success = session_pty_req(s); |
0b242b12 | 1801 | } else if (strcmp(rtype, "x11-req") == 0) { |
1802 | success = session_x11_req(s); | |
fa08c86b | 1803 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1804 | success = session_auth_agent_req(s); | |
0b242b12 | 1805 | } else if (strcmp(rtype, "subsystem") == 0) { |
1806 | success = session_subsystem_req(s); | |
e78a59f5 | 1807 | } |
1808 | } | |
1809 | if (strcmp(rtype, "window-change") == 0) { | |
1810 | success = session_window_change_req(s); | |
1811 | } | |
1812 | ||
1813 | if (reply) { | |
1814 | packet_start(success ? | |
1815 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1816 | packet_put_int(c->remote_id); | |
1817 | packet_send(); | |
1818 | } | |
1819 | xfree(rtype); | |
1820 | } | |
1821 | ||
1822 | void | |
1823 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1824 | { | |
1825 | if (!compat20) | |
1826 | fatal("session_set_fds: called for proto != 2.0"); | |
1827 | /* | |
1828 | * now that have a child and a pipe to the child, | |
1829 | * we can activate our channel and register the fd's | |
1830 | */ | |
1831 | if (s->chanid == -1) | |
1832 | fatal("no channel for session %d", s->self); | |
1833 | channel_set_fds(s->chanid, | |
1834 | fdout, fdin, fderr, | |
a22aff1f | 1835 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
1836 | 1); | |
e78a59f5 | 1837 | } |
1838 | ||
7368a6c8 | 1839 | void |
1840 | session_pty_cleanup(Session *s) | |
1841 | { | |
1842 | if (s == NULL || s->ttyfd == -1) | |
1843 | return; | |
1844 | ||
1845 | debug("session_pty_cleanup: session %i release %s", s->self, s->tty); | |
1846 | ||
1847 | /* Cancel the cleanup function. */ | |
1848 | fatal_remove_cleanup(pty_cleanup_proc, (void *)s); | |
1849 | ||
1850 | /* Record that the user has logged out. */ | |
1851 | record_logout(s->pid, s->tty); | |
1852 | ||
1853 | /* Release the pseudo-tty. */ | |
1854 | pty_release(s->tty); | |
1855 | ||
1856 | /* | |
1857 | * Close the server side of the socket pairs. We must do this after | |
1858 | * the pty cleanup, so that another process doesn't get this pty | |
1859 | * while we're still cleaning up. | |
1860 | */ | |
1861 | if (close(s->ptymaster) < 0) | |
1862 | error("close(s->ptymaster): %s", strerror(errno)); | |
1863 | } | |
e78a59f5 | 1864 | |
1865 | void | |
1866 | session_exit_message(Session *s, int status) | |
1867 | { | |
1868 | Channel *c; | |
1869 | if (s == NULL) | |
1870 | fatal("session_close: no session"); | |
1871 | c = channel_lookup(s->chanid); | |
1872 | if (c == NULL) | |
1873 | fatal("session_close: session %d: no channel %d", | |
1874 | s->self, s->chanid); | |
1875 | debug("session_exit_message: session %d channel %d pid %d", | |
1876 | s->self, s->chanid, s->pid); | |
1877 | ||
1878 | if (WIFEXITED(status)) { | |
1879 | channel_request_start(s->chanid, | |
1880 | "exit-status", 0); | |
1881 | packet_put_int(WEXITSTATUS(status)); | |
1882 | packet_send(); | |
1883 | } else if (WIFSIGNALED(status)) { | |
1884 | channel_request_start(s->chanid, | |
1885 | "exit-signal", 0); | |
1886 | packet_put_int(WTERMSIG(status)); | |
a64009ad | 1887 | #ifdef WCOREDUMP |
e78a59f5 | 1888 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1889 | #else /* WCOREDUMP */ |
1890 | packet_put_char(0); | |
1891 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1892 | packet_put_cstring(""); |
1893 | packet_put_cstring(""); | |
1894 | packet_send(); | |
1895 | } else { | |
1896 | /* Some weird exit cause. Just exit. */ | |
1897 | packet_disconnect("wait returned status %04x.", status); | |
1898 | } | |
1899 | ||
1900 | /* disconnect channel */ | |
1901 | debug("session_exit_message: release channel %d", s->chanid); | |
1902 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1903 | /* |
1904 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1905 | * interested in data we write. | |
1906 | * Note that we must not call 'chan_read_failed', since there could | |
1907 | * be some more data waiting in the pipe. | |
1908 | */ | |
0b242b12 | 1909 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1910 | chan_write_failed(c); | |
e78a59f5 | 1911 | s->chanid = -1; |
1912 | } | |
1913 | ||
1914 | void | |
1915 | session_free(Session *s) | |
1916 | { | |
1917 | debug("session_free: session %d pid %d", s->self, s->pid); | |
1918 | if (s->term) | |
1919 | xfree(s->term); | |
1920 | if (s->display) | |
1921 | xfree(s->display); | |
1922 | if (s->auth_data) | |
1923 | xfree(s->auth_data); | |
1924 | if (s->auth_proto) | |
1925 | xfree(s->auth_proto); | |
1926 | s->used = 0; | |
1927 | } | |
1928 | ||
1929 | void | |
1930 | session_close(Session *s) | |
1931 | { | |
1932 | session_pty_cleanup(s); | |
1933 | session_free(s); | |
1d1ffb87 | 1934 | session_proctitle(s); |
e78a59f5 | 1935 | } |
1936 | ||
1937 | void | |
1938 | session_close_by_pid(pid_t pid, int status) | |
1939 | { | |
1940 | Session *s = session_by_pid(pid); | |
1941 | if (s == NULL) { | |
1942 | debug("session_close_by_pid: no session for pid %d", s->pid); | |
1943 | return; | |
1944 | } | |
1945 | if (s->chanid != -1) | |
1946 | session_exit_message(s, status); | |
1947 | session_close(s); | |
1948 | } | |
1949 | ||
1950 | /* | |
1951 | * this is called when a channel dies before | |
1952 | * the session 'child' itself dies | |
1953 | */ | |
1954 | void | |
1955 | session_close_by_channel(int id, void *arg) | |
1956 | { | |
1957 | Session *s = session_by_channel(id); | |
1958 | if (s == NULL) { | |
1959 | debug("session_close_by_channel: no session for channel %d", id); | |
1960 | return; | |
1961 | } | |
1962 | /* disconnect channel */ | |
1963 | channel_cancel_cleanup(s->chanid); | |
1964 | s->chanid = -1; | |
1965 | ||
1966 | debug("session_close_by_channel: channel %d kill %d", id, s->pid); | |
1967 | if (s->pid == 0) { | |
1968 | /* close session immediately */ | |
1969 | session_close(s); | |
1970 | } else { | |
1971 | /* notify child, delay session cleanup */ | |
2b87da3b | 1972 | if (s->pid <= 1) |
512ad3c0 | 1973 | fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid); |
1974 | if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0) | |
e78a59f5 | 1975 | error("session_close_by_channel: kill %d: %s", |
1976 | s->pid, strerror(errno)); | |
1977 | } | |
1978 | } | |
1979 | ||
1d1ffb87 | 1980 | char * |
1981 | session_tty_list(void) | |
1982 | { | |
1983 | static char buf[1024]; | |
1984 | int i; | |
1985 | buf[0] = '\0'; | |
1986 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1987 | Session *s = &sessions[i]; | |
1988 | if (s->used && s->ttyfd != -1) { | |
1989 | if (buf[0] != '\0') | |
1990 | strlcat(buf, ",", sizeof buf); | |
1991 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1992 | } | |
1993 | } | |
1994 | if (buf[0] == '\0') | |
1995 | strlcpy(buf, "notty", sizeof buf); | |
1996 | return buf; | |
1997 | } | |
1998 | ||
1999 | void | |
2000 | session_proctitle(Session *s) | |
2001 | { | |
2002 | if (s->pw == NULL) | |
2003 | error("no user for session %d", s->self); | |
2004 | else | |
2005 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2006 | } | |
2007 | ||
e78a59f5 | 2008 | void |
59c97189 | 2009 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2010 | { |
2e73a022 | 2011 | |
e78a59f5 | 2012 | /* |
2013 | * Cancel the alarm we set to limit the time taken for | |
2014 | * authentication. | |
2015 | */ | |
2016 | alarm(0); | |
3f7a7e4a | 2017 | if (startup_pipe != -1) { |
5540ea9b | 2018 | close(startup_pipe); |
3f7a7e4a | 2019 | startup_pipe = -1; |
2020 | } | |
97994d32 | 2021 | #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD) |
59c97189 | 2022 | if ((lc = login_getclass(authctxt->pw->pw_class)) == NULL) { |
2e73a022 | 2023 | error("unable to get login class"); |
2024 | return; | |
2025 | } | |
2026 | #endif | |
e78a59f5 | 2027 | server_loop2(); |
34bce9a5 | 2028 | if (xauthfile) |
2029 | xauthfile_cleanup_proc(NULL); | |
e78a59f5 | 2030 | } |