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7368a6c8 | 1 | /* |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
bcbf86ec | 4 | * |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | * | |
e78a59f5 | 11 | * SSH2 support by Markus Friedl. |
12 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
bcbf86ec | 13 | * |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions | |
16 | * are met: | |
17 | * 1. Redistributions of source code must retain the above copyright | |
18 | * notice, this list of conditions and the following disclaimer. | |
19 | * 2. Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
e78a59f5 | 33 | */ |
7368a6c8 | 34 | |
35 | #include "includes.h" | |
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 | ||
3c62e7eb | 75 | #ifdef HAVE_CYGWIN |
76 | #include <windows.h> | |
77 | #include <sys/cygwin.h> | |
78 | #define is_winnt (GetVersion() < 0x80000000) | |
79 | #endif | |
80 | ||
3fcce26c | 81 | /* AIX limits */ |
82 | #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE) | |
2a2cb9e7 | 83 | # define S_UFSIZE_HARD S_UFSIZE "_hard" |
84 | # define S_UCPU_HARD S_UCPU "_hard" | |
85 | # define S_UDATA_HARD S_UDATA "_hard" | |
86 | # define S_USTACK_HARD S_USTACK "_hard" | |
87 | # define S_URSS_HARD S_URSS "_hard" | |
88 | # define S_UCORE_HARD S_UCORE "_hard" | |
89 | # define S_UNOFILE_HARD S_UNOFILE "_hard" | |
3fcce26c | 90 | #endif |
91 | ||
2e73a022 | 92 | #ifdef HAVE_LOGIN_CAP |
93 | #include <login_cap.h> | |
94 | #endif | |
95 | ||
7368a6c8 | 96 | /* types */ |
97 | ||
98 | #define TTYSZ 64 | |
99 | typedef struct Session Session; | |
100 | struct Session { | |
101 | int used; | |
102 | int self; | |
0b242b12 | 103 | int extended; |
7368a6c8 | 104 | struct passwd *pw; |
105 | pid_t pid; | |
106 | /* tty */ | |
107 | char *term; | |
108 | int ptyfd, ttyfd, ptymaster; | |
109 | int row, col, xpixel, ypixel; | |
110 | char tty[TTYSZ]; | |
111 | /* X11 */ | |
112 | char *display; | |
113 | int screen; | |
114 | char *auth_proto; | |
115 | char *auth_data; | |
0b242b12 | 116 | int single_connection; |
7368a6c8 | 117 | /* proto 2 */ |
118 | int chanid; | |
119 | }; | |
120 | ||
121 | /* func */ | |
122 | ||
123 | Session *session_new(void); | |
124 | void session_set_fds(Session *s, int fdin, int fdout, int fderr); | |
125 | void session_pty_cleanup(Session *s); | |
1d1ffb87 | 126 | void session_proctitle(Session *s); |
7368a6c8 | 127 | void do_exec_pty(Session *s, const char *command, struct passwd * pw); |
128 | void do_exec_no_pty(Session *s, const char *command, struct passwd * pw); | |
a22aff1f | 129 | void do_login(Session *s, const char *command); |
7368a6c8 | 130 | |
131 | void | |
132 | do_child(const char *command, struct passwd * pw, const char *term, | |
133 | const char *display, const char *auth_proto, | |
134 | const char *auth_data, const char *ttyname); | |
135 | ||
136 | /* import */ | |
137 | extern ServerOptions options; | |
138 | extern char *__progname; | |
139 | extern int log_stderr; | |
140 | extern int debug_flag; | |
1e3b8b07 | 141 | extern u_int utmp_len; |
7368a6c8 | 142 | |
089fbbd2 | 143 | extern int startup_pipe; |
144 | ||
7368a6c8 | 145 | /* Local Xauthority file. */ |
146 | static char *xauthfile; | |
147 | ||
b5e300c2 | 148 | /* original command from peer. */ |
2b87da3b | 149 | char *original_command = NULL; |
b5e300c2 | 150 | |
7368a6c8 | 151 | /* data */ |
152 | #define MAX_SESSIONS 10 | |
153 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 154 | |
c1ef8333 | 155 | #ifdef WITH_AIXAUTHENTICATE |
156 | /* AIX's lastlogin message, set in auth1.c */ | |
157 | char *aixloginmsg; | |
158 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 159 | |
2e73a022 | 160 | #ifdef HAVE_LOGIN_CAP |
161 | static login_cap_t *lc; | |
162 | #endif | |
163 | ||
7368a6c8 | 164 | /* |
165 | * Remove local Xauthority file. | |
166 | */ | |
167 | void | |
168 | xauthfile_cleanup_proc(void *ignore) | |
169 | { | |
170 | debug("xauthfile_cleanup_proc called"); | |
171 | ||
172 | if (xauthfile != NULL) { | |
173 | char *p; | |
174 | unlink(xauthfile); | |
175 | p = strrchr(xauthfile, '/'); | |
176 | if (p != NULL) { | |
177 | *p = '\0'; | |
178 | rmdir(xauthfile); | |
179 | } | |
180 | xfree(xauthfile); | |
181 | xauthfile = NULL; | |
182 | } | |
183 | } | |
184 | ||
185 | /* | |
186 | * Function to perform cleanup if we get aborted abnormally (e.g., due to a | |
187 | * dropped connection). | |
188 | */ | |
6ae2364d | 189 | void |
7368a6c8 | 190 | pty_cleanup_proc(void *session) |
191 | { | |
192 | Session *s=session; | |
193 | if (s == NULL) | |
194 | fatal("pty_cleanup_proc: no session"); | |
195 | debug("pty_cleanup_proc: %s", s->tty); | |
196 | ||
197 | if (s->pid != 0) { | |
198 | /* Record that the user has logged out. */ | |
199 | record_logout(s->pid, s->tty); | |
200 | } | |
201 | ||
202 | /* Release the pseudo-tty. */ | |
203 | pty_release(s->tty); | |
204 | } | |
205 | ||
206 | /* | |
207 | * Prepares for an interactive session. This is called after the user has | |
208 | * been successfully authenticated. During this message exchange, pseudo | |
209 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
210 | * are requested, etc. | |
211 | */ | |
6ae2364d | 212 | void |
7368a6c8 | 213 | do_authenticated(struct passwd * pw) |
214 | { | |
215 | Session *s; | |
b5e300c2 | 216 | int type, fd; |
7368a6c8 | 217 | int compression_level = 0, enable_compression_after_reply = 0; |
218 | int have_pty = 0; | |
219 | char *command; | |
220 | int n_bytes; | |
221 | int plen; | |
1e3b8b07 | 222 | u_int proto_len, data_len, dlen; |
7368a6c8 | 223 | |
224 | /* | |
225 | * Cancel the alarm we set to limit the time taken for | |
226 | * authentication. | |
227 | */ | |
228 | alarm(0); | |
3f7a7e4a | 229 | if (startup_pipe != -1) { |
5540ea9b | 230 | close(startup_pipe); |
3f7a7e4a | 231 | startup_pipe = -1; |
232 | } | |
7368a6c8 | 233 | |
234 | /* | |
235 | * Inform the channel mechanism that we are the server side and that | |
236 | * the client may request to connect to any port at all. (The user | |
237 | * could do it anyway, and we wouldn\'t know what is permitted except | |
238 | * by the client telling us, so we can equally well trust the client | |
239 | * not to request anything bogus.) | |
240 | */ | |
33de75a3 | 241 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) |
7368a6c8 | 242 | channel_permit_all_opens(); |
243 | ||
244 | s = session_new(); | |
0b242b12 | 245 | s->pw = pw; |
7368a6c8 | 246 | |
97994d32 | 247 | #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD) |
2e73a022 | 248 | if ((lc = login_getclass(pw->pw_class)) == NULL) { |
249 | error("unable to get login class"); | |
250 | return; | |
251 | } | |
252 | #endif | |
253 | ||
7368a6c8 | 254 | /* |
255 | * We stay in this loop until the client requests to execute a shell | |
256 | * or a command. | |
257 | */ | |
258 | for (;;) { | |
259 | int success = 0; | |
260 | ||
261 | /* Get a packet from the client. */ | |
262 | type = packet_read(&plen); | |
263 | ||
264 | /* Process the packet. */ | |
265 | switch (type) { | |
266 | case SSH_CMSG_REQUEST_COMPRESSION: | |
267 | packet_integrity_check(plen, 4, type); | |
268 | compression_level = packet_get_int(); | |
269 | if (compression_level < 1 || compression_level > 9) { | |
270 | packet_send_debug("Received illegal compression level %d.", | |
271 | compression_level); | |
272 | break; | |
273 | } | |
274 | /* Enable compression after we have responded with SUCCESS. */ | |
275 | enable_compression_after_reply = 1; | |
276 | success = 1; | |
277 | break; | |
278 | ||
279 | case SSH_CMSG_REQUEST_PTY: | |
280 | if (no_pty_flag) { | |
281 | debug("Allocating a pty not permitted for this authentication."); | |
282 | break; | |
283 | } | |
284 | if (have_pty) | |
285 | packet_disconnect("Protocol error: you already have a pty."); | |
286 | ||
287 | debug("Allocating pty."); | |
288 | ||
289 | /* Allocate a pty and open it. */ | |
290 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, | |
291 | sizeof(s->tty))) { | |
292 | error("Failed to allocate pty."); | |
293 | break; | |
294 | } | |
295 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
296 | pty_setowner(pw, s->tty); | |
297 | ||
298 | /* Get TERM from the packet. Note that the value may be of arbitrary length. */ | |
299 | s->term = packet_get_string(&dlen); | |
300 | packet_integrity_check(dlen, strlen(s->term), type); | |
301 | /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */ | |
302 | /* Remaining bytes */ | |
303 | n_bytes = plen - (4 + dlen + 4 * 4); | |
304 | ||
305 | if (strcmp(s->term, "") == 0) { | |
306 | xfree(s->term); | |
307 | s->term = NULL; | |
308 | } | |
309 | /* Get window size from the packet. */ | |
310 | s->row = packet_get_int(); | |
311 | s->col = packet_get_int(); | |
312 | s->xpixel = packet_get_int(); | |
313 | s->ypixel = packet_get_int(); | |
314 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
315 | ||
316 | /* Get tty modes from the packet. */ | |
317 | tty_parse_modes(s->ttyfd, &n_bytes); | |
318 | packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type); | |
319 | ||
1d1ffb87 | 320 | session_proctitle(s); |
321 | ||
7368a6c8 | 322 | /* Indicate that we now have a pty. */ |
323 | success = 1; | |
324 | have_pty = 1; | |
325 | break; | |
326 | ||
327 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
328 | if (!options.x11_forwarding) { | |
329 | packet_send_debug("X11 forwarding disabled in server configuration file."); | |
330 | break; | |
331 | } | |
6fc1e9f3 | 332 | if (!options.xauth_location) { |
333 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
334 | break; | |
335 | } | |
7368a6c8 | 336 | if (no_x11_forwarding_flag) { |
337 | packet_send_debug("X11 forwarding not permitted for this authentication."); | |
338 | break; | |
339 | } | |
340 | debug("Received request for X11 forwarding with auth spoofing."); | |
341 | if (s->display != NULL) | |
342 | packet_disconnect("Protocol error: X11 display already set."); | |
343 | ||
344 | s->auth_proto = packet_get_string(&proto_len); | |
345 | s->auth_data = packet_get_string(&data_len); | |
346 | packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type); | |
347 | ||
348 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER) | |
349 | s->screen = packet_get_int(); | |
350 | else | |
351 | s->screen = 0; | |
352 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
353 | ||
354 | if (s->display == NULL) | |
355 | break; | |
356 | ||
357 | /* Setup to always have a local .Xauthority. */ | |
358 | xauthfile = xmalloc(MAXPATHLEN); | |
359 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
360 | temporarily_use_uid(pw->pw_uid); | |
361 | if (mkdtemp(xauthfile) == NULL) { | |
362 | restore_uid(); | |
363 | error("private X11 dir: mkdtemp %s failed: %s", | |
364 | xauthfile, strerror(errno)); | |
365 | xfree(xauthfile); | |
366 | xauthfile = NULL; | |
0b242b12 | 367 | /* XXXX remove listening channels */ |
7368a6c8 | 368 | break; |
369 | } | |
370 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 371 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
372 | if (fd >= 0) | |
373 | close(fd); | |
7368a6c8 | 374 | restore_uid(); |
375 | fatal_add_cleanup(xauthfile_cleanup_proc, NULL); | |
376 | success = 1; | |
377 | break; | |
7368a6c8 | 378 | |
379 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
380 | if (no_agent_forwarding_flag || compat13) { | |
381 | debug("Authentication agent forwarding not permitted for this authentication."); | |
382 | break; | |
383 | } | |
384 | debug("Received authentication agent forwarding request."); | |
6fc1e9f3 | 385 | success = auth_input_request_forwarding(pw); |
7368a6c8 | 386 | break; |
387 | ||
388 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
389 | if (no_port_forwarding_flag) { | |
390 | debug("Port forwarding not permitted for this authentication."); | |
391 | break; | |
392 | } | |
33de75a3 | 393 | if (!options.allow_tcp_forwarding) { |
394 | debug("Port forwarding not permitted."); | |
395 | break; | |
396 | } | |
7368a6c8 | 397 | debug("Received TCP/IP port forwarding request."); |
1d1ffb87 | 398 | channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 399 | success = 1; |
400 | break; | |
401 | ||
402 | case SSH_CMSG_MAX_PACKET_SIZE: | |
403 | if (packet_set_maxsize(packet_get_int()) > 0) | |
404 | success = 1; | |
405 | break; | |
406 | ||
407 | case SSH_CMSG_EXEC_SHELL: | |
408 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 409 | if (type == SSH_CMSG_EXEC_CMD) { |
410 | command = packet_get_string(&dlen); | |
411 | debug("Exec command '%.500s'", command); | |
412 | packet_integrity_check(plen, 4 + dlen, type); | |
413 | } else { | |
414 | command = NULL; | |
415 | packet_integrity_check(plen, 0, type); | |
416 | } | |
417 | if (forced_command != NULL) { | |
b5e300c2 | 418 | original_command = command; |
7368a6c8 | 419 | command = forced_command; |
420 | debug("Forced command '%.500s'", forced_command); | |
421 | } | |
422 | if (have_pty) | |
423 | do_exec_pty(s, command, pw); | |
424 | else | |
425 | do_exec_no_pty(s, command, pw); | |
426 | ||
427 | if (command != NULL) | |
428 | xfree(command); | |
429 | /* Cleanup user's local Xauthority file. */ | |
430 | if (xauthfile) | |
431 | xauthfile_cleanup_proc(NULL); | |
432 | return; | |
433 | ||
434 | default: | |
435 | /* | |
436 | * Any unknown messages in this phase are ignored, | |
437 | * and a failure message is returned. | |
438 | */ | |
439 | log("Unknown packet type received after authentication: %d", type); | |
440 | } | |
441 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
442 | packet_send(); | |
443 | packet_write_wait(); | |
444 | ||
445 | /* Enable compression now that we have replied if appropriate. */ | |
446 | if (enable_compression_after_reply) { | |
447 | enable_compression_after_reply = 0; | |
448 | packet_start_compression(compression_level); | |
449 | } | |
450 | } | |
451 | } | |
452 | ||
453 | /* | |
454 | * This is called to fork and execute a command when we have no tty. This | |
455 | * will call do_child from the child, and server_loop from the parent after | |
456 | * setting up file descriptors and such. | |
457 | */ | |
6ae2364d | 458 | void |
7368a6c8 | 459 | do_exec_no_pty(Session *s, const char *command, struct passwd * pw) |
460 | { | |
461 | int pid; | |
462 | ||
463 | #ifdef USE_PIPES | |
464 | int pin[2], pout[2], perr[2]; | |
465 | /* Allocate pipes for communicating with the program. */ | |
466 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
467 | packet_disconnect("Could not create pipes: %.100s", | |
468 | strerror(errno)); | |
469 | #else /* USE_PIPES */ | |
470 | int inout[2], err[2]; | |
471 | /* Uses socket pairs to communicate with the program. */ | |
472 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
473 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
474 | packet_disconnect("Could not create socket pairs: %.100s", | |
475 | strerror(errno)); | |
476 | #endif /* USE_PIPES */ | |
477 | if (s == NULL) | |
478 | fatal("do_exec_no_pty: no session"); | |
479 | ||
1d1ffb87 | 480 | session_proctitle(s); |
7368a6c8 | 481 | |
7368a6c8 | 482 | /* Fork the child. */ |
483 | if ((pid = fork()) == 0) { | |
484 | /* Child. Reinitialize the log since the pid has changed. */ | |
485 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
486 | ||
6c935fbd | 487 | signal(SIGPIPE, SIG_DFL); |
488 | ||
7368a6c8 | 489 | /* |
490 | * Create a new session and process group since the 4.4BSD | |
491 | * setlogin() affects the entire process group. | |
492 | */ | |
493 | if (setsid() < 0) | |
494 | error("setsid failed: %.100s", strerror(errno)); | |
495 | ||
496 | #ifdef USE_PIPES | |
497 | /* | |
498 | * Redirect stdin. We close the parent side of the socket | |
499 | * pair, and make the child side the standard input. | |
500 | */ | |
501 | close(pin[1]); | |
502 | if (dup2(pin[0], 0) < 0) | |
503 | perror("dup2 stdin"); | |
504 | close(pin[0]); | |
505 | ||
506 | /* Redirect stdout. */ | |
507 | close(pout[0]); | |
508 | if (dup2(pout[1], 1) < 0) | |
509 | perror("dup2 stdout"); | |
510 | close(pout[1]); | |
511 | ||
512 | /* Redirect stderr. */ | |
513 | close(perr[0]); | |
514 | if (dup2(perr[1], 2) < 0) | |
515 | perror("dup2 stderr"); | |
516 | close(perr[1]); | |
517 | #else /* USE_PIPES */ | |
518 | /* | |
519 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
520 | * use the same socket, as some programs (particularly rdist) | |
521 | * seem to depend on it. | |
522 | */ | |
523 | close(inout[1]); | |
524 | close(err[1]); | |
525 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
526 | perror("dup2 stdin"); | |
527 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
528 | perror("dup2 stdout"); | |
529 | if (dup2(err[0], 2) < 0) /* stderr */ | |
530 | perror("dup2 stderr"); | |
531 | #endif /* USE_PIPES */ | |
532 | ||
533 | /* Do processing for the child (exec command etc). */ | |
534 | do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL); | |
535 | /* NOTREACHED */ | |
536 | } | |
3c62e7eb | 537 | #ifdef HAVE_CYGWIN |
538 | if (is_winnt) | |
539 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
540 | #endif | |
7368a6c8 | 541 | if (pid < 0) |
542 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
543 | s->pid = pid; | |
b5c334cc | 544 | /* Set interactive/non-interactive mode. */ |
545 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 546 | #ifdef USE_PIPES |
547 | /* We are the parent. Close the child sides of the pipes. */ | |
548 | close(pin[0]); | |
549 | close(pout[1]); | |
550 | close(perr[1]); | |
551 | ||
e78a59f5 | 552 | if (compat20) { |
0b242b12 | 553 | session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1); |
e78a59f5 | 554 | } else { |
555 | /* Enter the interactive session. */ | |
556 | server_loop(pid, pin[1], pout[0], perr[0]); | |
557 | /* server_loop has closed pin[1], pout[1], and perr[1]. */ | |
558 | } | |
7368a6c8 | 559 | #else /* USE_PIPES */ |
560 | /* We are the parent. Close the child sides of the socket pairs. */ | |
561 | close(inout[0]); | |
562 | close(err[0]); | |
563 | ||
564 | /* | |
565 | * Enter the interactive session. Note: server_loop must be able to | |
566 | * handle the case that fdin and fdout are the same. | |
567 | */ | |
e78a59f5 | 568 | if (compat20) { |
0b242b12 | 569 | session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1); |
e78a59f5 | 570 | } else { |
571 | server_loop(pid, inout[1], inout[1], err[1]); | |
572 | /* server_loop has closed inout[1] and err[1]. */ | |
573 | } | |
7368a6c8 | 574 | #endif /* USE_PIPES */ |
575 | } | |
576 | ||
577 | /* | |
578 | * This is called to fork and execute a command when we have a tty. This | |
579 | * will call do_child from the child, and server_loop from the parent after | |
580 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
581 | * lastlog, and other such operations. | |
582 | */ | |
6ae2364d | 583 | void |
7368a6c8 | 584 | do_exec_pty(Session *s, const char *command, struct passwd * pw) |
585 | { | |
7368a6c8 | 586 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 587 | pid_t pid; |
7368a6c8 | 588 | |
589 | if (s == NULL) | |
590 | fatal("do_exec_pty: no session"); | |
591 | ptyfd = s->ptyfd; | |
592 | ttyfd = s->ttyfd; | |
593 | ||
7368a6c8 | 594 | /* Fork the child. */ |
595 | if ((pid = fork()) == 0) { | |
c345cf9d | 596 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 597 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
598 | ||
6c935fbd | 599 | signal(SIGPIPE, SIG_DFL); |
600 | ||
7368a6c8 | 601 | /* Close the master side of the pseudo tty. */ |
602 | close(ptyfd); | |
603 | ||
604 | /* Make the pseudo tty our controlling tty. */ | |
605 | pty_make_controlling_tty(&ttyfd, s->tty); | |
606 | ||
607 | /* Redirect stdin from the pseudo tty. */ | |
608 | if (dup2(ttyfd, fileno(stdin)) < 0) | |
609 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
610 | ||
611 | /* Redirect stdout to the pseudo tty. */ | |
612 | if (dup2(ttyfd, fileno(stdout)) < 0) | |
613 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
614 | ||
615 | /* Redirect stderr to the pseudo tty. */ | |
616 | if (dup2(ttyfd, fileno(stderr)) < 0) | |
617 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
618 | ||
619 | /* Close the extra descriptor for the pseudo tty. */ | |
620 | close(ttyfd); | |
621 | ||
c345cf9d | 622 | /* record login, etc. similar to login(1) */ |
a22aff1f | 623 | if (!(options.use_login && command == NULL)) |
624 | do_login(s, command); | |
7368a6c8 | 625 | |
7368a6c8 | 626 | /* Do common processing for the child, such as execing the command. */ |
71276795 | 627 | do_child(command, pw, s->term, s->display, s->auth_proto, |
628 | s->auth_data, s->tty); | |
7368a6c8 | 629 | /* NOTREACHED */ |
630 | } | |
3c62e7eb | 631 | #ifdef HAVE_CYGWIN |
632 | if (is_winnt) | |
633 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
634 | #endif | |
7368a6c8 | 635 | if (pid < 0) |
636 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
637 | s->pid = pid; | |
638 | ||
639 | /* Parent. Close the slave side of the pseudo tty. */ | |
640 | close(ttyfd); | |
641 | ||
642 | /* | |
643 | * Create another descriptor of the pty master side for use as the | |
644 | * standard input. We could use the original descriptor, but this | |
645 | * simplifies code in server_loop. The descriptor is bidirectional. | |
646 | */ | |
647 | fdout = dup(ptyfd); | |
648 | if (fdout < 0) | |
649 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
650 | ||
651 | /* we keep a reference to the pty master */ | |
652 | ptymaster = dup(ptyfd); | |
653 | if (ptymaster < 0) | |
654 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
655 | s->ptymaster = ptymaster; | |
656 | ||
657 | /* Enter interactive session. */ | |
b5c334cc | 658 | packet_set_interactive(1); |
e78a59f5 | 659 | if (compat20) { |
660 | session_set_fds(s, ptyfd, fdout, -1); | |
661 | } else { | |
662 | server_loop(pid, ptyfd, fdout, -1); | |
663 | /* server_loop _has_ closed ptyfd and fdout. */ | |
664 | session_pty_cleanup(s); | |
665 | } | |
7368a6c8 | 666 | } |
667 | ||
c345cf9d | 668 | const char * |
669 | get_remote_name_or_ip(void) | |
670 | { | |
671 | static const char *remote = ""; | |
672 | if (utmp_len > 0) | |
61e96248 | 673 | remote = get_canonical_hostname(options.reverse_mapping_check); |
c345cf9d | 674 | if (utmp_len == 0 || strlen(remote) > utmp_len) |
675 | remote = get_remote_ipaddr(); | |
676 | return remote; | |
677 | } | |
678 | ||
679 | /* administrative, login(1)-like work */ | |
680 | void | |
a22aff1f | 681 | do_login(Session *s, const char *command) |
c345cf9d | 682 | { |
683 | FILE *f; | |
684 | char *time_string; | |
685 | char buf[256]; | |
b5e300c2 | 686 | char hostname[MAXHOSTNAMELEN]; |
c345cf9d | 687 | socklen_t fromlen; |
688 | struct sockaddr_storage from; | |
689 | struct stat st; | |
690 | time_t last_login_time; | |
691 | struct passwd * pw = s->pw; | |
692 | pid_t pid = getpid(); | |
693 | ||
694 | /* | |
695 | * Get IP address of client. If the connection is not a socket, let | |
696 | * the address be 0.0.0.0. | |
697 | */ | |
698 | memset(&from, 0, sizeof(from)); | |
699 | if (packet_connection_is_on_socket()) { | |
700 | fromlen = sizeof(from); | |
701 | if (getpeername(packet_get_connection_in(), | |
702 | (struct sockaddr *) & from, &fromlen) < 0) { | |
703 | debug("getpeername: %.100s", strerror(errno)); | |
704 | fatal_cleanup(); | |
705 | } | |
706 | } | |
707 | ||
bcbf86ec | 708 | /* Get the time and hostname when the user last logged in. */ |
709 | hostname[0] = '\0'; | |
710 | last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name, | |
711 | hostname, sizeof(hostname)); | |
712 | ||
c345cf9d | 713 | /* Record that there was a login on that tty from the remote host. */ |
714 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
715 | get_remote_name_or_ip(), (struct sockaddr *)&from); | |
716 | ||
2919e060 | 717 | #ifdef USE_PAM |
718 | /* | |
719 | * If password change is needed, do it now. | |
720 | * This needs to occur before the ~/.hushlogin check. | |
721 | */ | |
e11aab29 | 722 | if (is_pam_password_change_required()) { |
2919e060 | 723 | print_pam_messages(); |
724 | do_pam_chauthtok(); | |
725 | } | |
726 | #endif | |
727 | ||
a22aff1f | 728 | /* Done if .hushlogin exists or a command given. */ |
729 | if (command != NULL) | |
730 | return; | |
c345cf9d | 731 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); |
2e73a022 | 732 | #ifdef HAVE_LOGIN_CAP |
733 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
734 | #else | |
c345cf9d | 735 | if (stat(buf, &st) >= 0) |
2e73a022 | 736 | #endif |
c345cf9d | 737 | return; |
738 | ||
739 | #ifdef USE_PAM | |
e11aab29 | 740 | if (!is_pam_password_change_required()) |
2919e060 | 741 | print_pam_messages(); |
c345cf9d | 742 | #endif /* USE_PAM */ |
743 | #ifdef WITH_AIXAUTHENTICATE | |
744 | if (aixloginmsg && *aixloginmsg) | |
745 | printf("%s\n", aixloginmsg); | |
746 | #endif /* WITH_AIXAUTHENTICATE */ | |
747 | ||
c345cf9d | 748 | if (last_login_time != 0) { |
749 | time_string = ctime(&last_login_time); | |
750 | if (strchr(time_string, '\n')) | |
751 | *strchr(time_string, '\n') = 0; | |
f478712e | 752 | if (strcmp(hostname, "") == 0) |
c345cf9d | 753 | printf("Last login: %s\r\n", time_string); |
754 | else | |
bcbf86ec | 755 | printf("Last login: %s from %s\r\n", time_string, hostname); |
c345cf9d | 756 | } |
757 | if (options.print_motd) { | |
2e73a022 | 758 | #ifdef HAVE_LOGIN_CAP |
759 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
760 | "/etc/motd"), "r"); | |
761 | #else | |
c345cf9d | 762 | f = fopen("/etc/motd", "r"); |
2e73a022 | 763 | #endif |
c345cf9d | 764 | if (f) { |
765 | while (fgets(buf, sizeof(buf), f)) | |
766 | fputs(buf, stdout); | |
767 | fclose(f); | |
768 | } | |
769 | } | |
770 | } | |
771 | ||
7368a6c8 | 772 | /* |
773 | * Sets the value of the given variable in the environment. If the variable | |
774 | * already exists, its value is overriden. | |
775 | */ | |
6ae2364d | 776 | void |
1e3b8b07 | 777 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
7368a6c8 | 778 | const char *value) |
779 | { | |
1e3b8b07 | 780 | u_int i, namelen; |
7368a6c8 | 781 | char **env; |
782 | ||
783 | /* | |
784 | * Find the slot where the value should be stored. If the variable | |
785 | * already exists, we reuse the slot; otherwise we append a new slot | |
786 | * at the end of the array, expanding if necessary. | |
787 | */ | |
788 | env = *envp; | |
789 | namelen = strlen(name); | |
790 | for (i = 0; env[i]; i++) | |
791 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
792 | break; | |
793 | if (env[i]) { | |
794 | /* Reuse the slot. */ | |
795 | xfree(env[i]); | |
796 | } else { | |
797 | /* New variable. Expand if necessary. */ | |
798 | if (i >= (*envsizep) - 1) { | |
799 | (*envsizep) += 50; | |
800 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
801 | } | |
802 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
803 | env[i + 1] = NULL; | |
804 | } | |
805 | ||
806 | /* Allocate space and format the variable in the appropriate slot. */ | |
807 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
808 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
809 | } | |
810 | ||
811 | /* | |
812 | * Reads environment variables from the given file and adds/overrides them | |
813 | * into the environment. If the file does not exist, this does nothing. | |
814 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
815 | * and assignments of the form name=value. No other forms are allowed. | |
816 | */ | |
6ae2364d | 817 | void |
1e3b8b07 | 818 | read_environment_file(char ***env, u_int *envsize, |
7368a6c8 | 819 | const char *filename) |
820 | { | |
821 | FILE *f; | |
822 | char buf[4096]; | |
823 | char *cp, *value; | |
824 | ||
825 | f = fopen(filename, "r"); | |
826 | if (!f) | |
827 | return; | |
828 | ||
829 | while (fgets(buf, sizeof(buf), f)) { | |
830 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
831 | ; | |
832 | if (!*cp || *cp == '#' || *cp == '\n') | |
833 | continue; | |
834 | if (strchr(cp, '\n')) | |
835 | *strchr(cp, '\n') = '\0'; | |
836 | value = strchr(cp, '='); | |
837 | if (value == NULL) { | |
838 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
839 | continue; | |
840 | } | |
71276795 | 841 | /* |
842 | * Replace the equals sign by nul, and advance value to | |
843 | * the value string. | |
844 | */ | |
7368a6c8 | 845 | *value = '\0'; |
846 | value++; | |
847 | child_set_env(env, envsize, cp, value); | |
848 | } | |
849 | fclose(f); | |
850 | } | |
851 | ||
852 | #ifdef USE_PAM | |
853 | /* | |
854 | * Sets any environment variables which have been specified by PAM | |
855 | */ | |
856 | void do_pam_environment(char ***env, int *envsize) | |
857 | { | |
858 | char *equals, var_name[512], var_val[512]; | |
859 | char **pam_env; | |
860 | int i; | |
861 | ||
862 | if ((pam_env = fetch_pam_environment()) == NULL) | |
863 | return; | |
2b87da3b | 864 | |
7368a6c8 | 865 | for(i = 0; pam_env[i] != NULL; i++) { |
866 | if ((equals = strstr(pam_env[i], "=")) == NULL) | |
867 | continue; | |
2b87da3b | 868 | |
7368a6c8 | 869 | if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) { |
870 | memset(var_name, '\0', sizeof(var_name)); | |
871 | memset(var_val, '\0', sizeof(var_val)); | |
872 | ||
873 | strncpy(var_name, pam_env[i], equals - pam_env[i]); | |
874 | strcpy(var_val, equals + 1); | |
875 | ||
22d89d24 | 876 | debug3("PAM environment: %s=%s", var_name, var_val); |
7368a6c8 | 877 | |
878 | child_set_env(env, envsize, var_name, var_val); | |
879 | } | |
880 | } | |
881 | } | |
882 | #endif /* USE_PAM */ | |
883 | ||
22d89d24 | 884 | #ifdef HAVE_CYGWIN |
885 | void copy_environment(char ***env, int *envsize) | |
886 | { | |
887 | char *equals, var_name[512], var_val[512]; | |
888 | int i; | |
889 | ||
890 | for(i = 0; environ[i] != NULL; i++) { | |
891 | if ((equals = strstr(environ[i], "=")) == NULL) | |
892 | continue; | |
2b87da3b | 893 | |
22d89d24 | 894 | if (strlen(environ[i]) < (sizeof(var_name) - 1)) { |
895 | memset(var_name, '\0', sizeof(var_name)); | |
896 | memset(var_val, '\0', sizeof(var_val)); | |
897 | ||
898 | strncpy(var_name, environ[i], equals - environ[i]); | |
899 | strcpy(var_val, equals + 1); | |
900 | ||
901 | debug3("Copy environment: %s=%s", var_name, var_val); | |
902 | ||
903 | child_set_env(env, envsize, var_name, var_val); | |
904 | } | |
905 | } | |
906 | } | |
907 | #endif | |
908 | ||
5fa45897 | 909 | #if defined(HAVE_GETUSERATTR) |
910 | /* | |
911 | * AIX-specific login initialisation | |
912 | */ | |
913 | void set_limit(char *user, char *soft, char *hard, int resource, int mult) | |
914 | { | |
915 | struct rlimit rlim; | |
56118702 | 916 | int slim, hlim; |
5fa45897 | 917 | |
918 | getrlimit(resource, &rlim); | |
919 | ||
56118702 | 920 | slim = 0; |
921 | if (getuserattr(user, soft, &slim, SEC_INT) != -1) { | |
922 | if (slim < 0) { | |
923 | rlim.rlim_cur = RLIM_INFINITY; | |
924 | } else if (slim != 0) { | |
925 | /* See the wackiness below */ | |
926 | if (rlim.rlim_cur == slim * mult) | |
927 | slim = 0; | |
928 | else | |
929 | rlim.rlim_cur = slim * mult; | |
930 | } | |
931 | } | |
5fa45897 | 932 | |
56118702 | 933 | hlim = 0; |
934 | if (getuserattr(user, hard, &hlim, SEC_INT) != -1) { | |
935 | if (hlim < 0) { | |
936 | rlim.rlim_max = RLIM_INFINITY; | |
937 | } else if (hlim != 0) { | |
938 | rlim.rlim_max = hlim * mult; | |
939 | } | |
940 | } | |
5fa45897 | 941 | |
56118702 | 942 | /* |
943 | * XXX For cpu and fsize the soft limit is set to the hard limit | |
944 | * if the hard limit is left at its default value and the soft limit | |
945 | * is changed from its default value, either by requesting it | |
946 | * (slim == 0) or by setting it to the current default. At least | |
947 | * that's how rlogind does it. If you're confused you're not alone. | |
948 | * Bug or feature? AIX 4.3.1.2 | |
949 | */ | |
950 | if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu")) | |
951 | && hlim == 0 && slim != 0) | |
952 | rlim.rlim_max = rlim.rlim_cur; | |
953 | /* A specified hard limit limits the soft limit */ | |
954 | else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max) | |
955 | rlim.rlim_cur = rlim.rlim_max; | |
956 | /* A soft limit can increase a hard limit */ | |
957 | else if (rlim.rlim_cur > rlim.rlim_max) | |
5fa45897 | 958 | rlim.rlim_max = rlim.rlim_cur; |
959 | ||
960 | if (setrlimit(resource, &rlim) != 0) | |
56118702 | 961 | error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno)); |
5fa45897 | 962 | } |
963 | ||
964 | void set_limits_from_userattr(char *user) | |
965 | { | |
966 | int mask; | |
967 | char buf[16]; | |
968 | ||
969 | set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512); | |
970 | set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1); | |
971 | set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512); | |
972 | set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512); | |
973 | set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512); | |
974 | set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512); | |
975 | #if defined(S_UNOFILE) | |
976 | set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1); | |
977 | #endif | |
978 | ||
979 | if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) { | |
980 | /* Convert decimal to octal */ | |
981 | (void) snprintf(buf, sizeof(buf), "%d", mask); | |
982 | if (sscanf(buf, "%o", &mask) == 1) | |
983 | umask(mask); | |
984 | } | |
985 | } | |
986 | #endif /* defined(HAVE_GETUSERATTR) */ | |
987 | ||
7368a6c8 | 988 | /* |
989 | * Performs common processing for the child, such as setting up the | |
990 | * environment, closing extra file descriptors, setting the user and group | |
991 | * ids, and executing the command or shell. | |
992 | */ | |
6ae2364d | 993 | void |
7368a6c8 | 994 | do_child(const char *command, struct passwd * pw, const char *term, |
995 | const char *display, const char *auth_proto, | |
996 | const char *auth_data, const char *ttyname) | |
997 | { | |
b5e300c2 | 998 | const char *shell, *hostname = NULL, *cp = NULL; |
7368a6c8 | 999 | char buf[256]; |
6fc1e9f3 | 1000 | char cmd[1024]; |
2e73a022 | 1001 | FILE *f = NULL; |
1e3b8b07 | 1002 | u_int envsize, i; |
7368a6c8 | 1003 | char **env; |
1004 | extern char **environ; | |
1005 | struct stat st; | |
1006 | char *argv[10]; | |
3206bb3b | 1007 | #ifdef WITH_IRIX_PROJECT |
1008 | prid_t projid; | |
1009 | #endif /* WITH_IRIX_PROJECT */ | |
d287c664 | 1010 | #ifdef WITH_IRIX_JOBS |
1011 | jid_t jid = 0; | |
1012 | #else | |
1013 | #ifdef WITH_IRIX_ARRAY | |
1014 | int jid = 0; | |
1015 | #endif /* WITH_IRIX_ARRAY */ | |
1016 | #endif /* WITH_IRIX_JOBS */ | |
1017 | ||
0086bfaf | 1018 | #ifdef USE_PAM |
1019 | do_pam_session(pw->pw_name, ttyname); | |
1020 | do_pam_setcred(); | |
1021 | #endif /* USE_PAM */ | |
7368a6c8 | 1022 | |
fa649821 | 1023 | /* login(1) is only called if we execute the login shell */ |
1024 | if (options.use_login && command != NULL) | |
1025 | options.use_login = 0; | |
1026 | ||
7368a6c8 | 1027 | #ifndef USE_PAM /* pam_nologin handles this */ |
2e73a022 | 1028 | if (!options.use_login) { |
1029 | # ifdef HAVE_LOGIN_CAP | |
1030 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1031 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1032 | _PATH_NOLOGIN), "r"); | |
1033 | # else /* HAVE_LOGIN_CAP */ | |
1034 | if (pw->pw_uid) | |
1035 | f = fopen(_PATH_NOLOGIN, "r"); | |
1036 | # endif /* HAVE_LOGIN_CAP */ | |
1037 | if (f) { | |
1038 | /* /etc/nologin exists. Print its contents and exit. */ | |
1039 | while (fgets(buf, sizeof(buf), f)) | |
1040 | fputs(buf, stderr); | |
1041 | fclose(f); | |
7368a6c8 | 1042 | exit(254); |
2e73a022 | 1043 | } |
7368a6c8 | 1044 | } |
1045 | #endif /* USE_PAM */ | |
1046 | ||
2e73a022 | 1047 | /* Set login name, uid, gid, and groups. */ |
7368a6c8 | 1048 | /* Login(1) does this as well, and it needs uid 0 for the "-h" |
1049 | switch, so we let login(1) to this for us. */ | |
1050 | if (!options.use_login) { | |
4d33e531 | 1051 | #ifdef HAVE_OSF_SIA |
b7ccb051 | 1052 | session_setup_sia(pw->pw_name, ttyname); |
815800e1 | 1053 | #else /* HAVE_OSF_SIA */ |
3c62e7eb | 1054 | #ifdef HAVE_CYGWIN |
1055 | if (is_winnt) { | |
1056 | #else | |
7368a6c8 | 1057 | if (getuid() == 0 || geteuid() == 0) { |
3c62e7eb | 1058 | #endif |
2e73a022 | 1059 | # ifdef HAVE_GETUSERATTR |
5fa45897 | 1060 | set_limits_from_userattr(pw->pw_name); |
2e73a022 | 1061 | # endif /* HAVE_GETUSERATTR */ |
1062 | # ifdef HAVE_LOGIN_CAP | |
1063 | if (setusercontext(lc, pw, pw->pw_uid, | |
1064 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1065 | perror("unable to set user context"); | |
1066 | exit(1); | |
1067 | } | |
1068 | # else /* HAVE_LOGIN_CAP */ | |
1069 | if (setlogin(pw->pw_name) < 0) | |
1070 | error("setlogin failed: %s", strerror(errno)); | |
7368a6c8 | 1071 | if (setgid(pw->pw_gid) < 0) { |
1072 | perror("setgid"); | |
1073 | exit(1); | |
1074 | } | |
1075 | /* Initialize the group list. */ | |
1076 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1077 | perror("initgroups"); | |
1078 | exit(1); | |
1079 | } | |
1080 | endgrent(); | |
d287c664 | 1081 | # ifdef WITH_IRIX_JOBS |
1082 | jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive"); | |
1083 | if (jid == -1) { | |
1084 | fatal("Failed to create job container: %.100s", | |
1085 | strerror(errno)); | |
2b87da3b | 1086 | } |
d287c664 | 1087 | # endif /* WITH_IRIX_JOBS */ |
2e73a022 | 1088 | # ifdef WITH_IRIX_ARRAY |
3206bb3b | 1089 | /* initialize array session */ |
d287c664 | 1090 | if (jid == 0) { |
1091 | if (newarraysess() != 0) | |
1092 | fatal("Failed to set up new array session: %.100s", | |
1093 | strerror(errno)); | |
1094 | } | |
2e73a022 | 1095 | # endif /* WITH_IRIX_ARRAY */ |
1096 | # ifdef WITH_IRIX_PROJECT | |
3206bb3b | 1097 | /* initialize irix project info */ |
1098 | if ((projid = getdfltprojuser(pw->pw_name)) == -1) { | |
1099 | debug("Failed to get project id, using projid 0"); | |
1100 | projid = 0; | |
1101 | } | |
3206bb3b | 1102 | if (setprid(projid)) |
1103 | fatal("Failed to initialize project %d for %s: %.100s", | |
1104 | (int)projid, pw->pw_name, strerror(errno)); | |
2e73a022 | 1105 | # endif /* WITH_IRIX_PROJECT */ |
260d427b | 1106 | #ifdef WITH_IRIX_AUDIT |
1107 | if (sysconf(_SC_AUDIT)) { | |
1108 | debug("Setting sat id to %d", (int) pw->pw_uid); | |
1109 | if (satsetid(pw->pw_uid)) | |
1110 | debug("error setting satid: %.100s", strerror(errno)); | |
1111 | } | |
1112 | #endif /* WITH_IRIX_AUDIT */ | |
1113 | ||
7368a6c8 | 1114 | /* Permanently switch to the desired uid. */ |
1115 | permanently_set_uid(pw->pw_uid); | |
2e73a022 | 1116 | # endif /* HAVE_LOGIN_CAP */ |
7368a6c8 | 1117 | } |
2e73a022 | 1118 | #endif /* HAVE_OSF_SIA */ |
1119 | ||
aca75d94 | 1120 | #if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) |
1121 | /* Sets login uid for accounting */ | |
1122 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1123 | error("setluid: %s", strerror(errno)); | |
1124 | #endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1125 | ||
3c62e7eb | 1126 | #ifdef HAVE_CYGWIN |
1127 | if (is_winnt) | |
1128 | #endif | |
7368a6c8 | 1129 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
14a9a859 | 1130 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
7368a6c8 | 1131 | } |
1132 | /* | |
1133 | * Get the shell from the password data. An empty shell field is | |
1134 | * legal, and means /bin/sh. | |
1135 | */ | |
1136 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
2e73a022 | 1137 | #ifdef HAVE_LOGIN_CAP |
1138 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1139 | #endif | |
7368a6c8 | 1140 | |
1141 | #ifdef AFS | |
1142 | /* Try to get AFS tokens for the local cell. */ | |
1143 | if (k_hasafs()) { | |
1144 | char cell[64]; | |
1145 | ||
1146 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1147 | krb_afslog(cell, 0); | |
1148 | ||
1149 | krb_afslog(0, 0); | |
1150 | } | |
1151 | #endif /* AFS */ | |
1152 | ||
1153 | /* Initialize the environment. */ | |
1154 | envsize = 100; | |
1155 | env = xmalloc(envsize * sizeof(char *)); | |
1156 | env[0] = NULL; | |
1157 | ||
3c62e7eb | 1158 | #ifdef HAVE_CYGWIN |
1159 | /* | |
1160 | * The Windows environment contains some setting which are | |
1161 | * important for a running system. They must not be dropped. | |
1162 | */ | |
22d89d24 | 1163 | copy_environment(&env, &envsize); |
3c62e7eb | 1164 | #endif |
1165 | ||
7368a6c8 | 1166 | if (!options.use_login) { |
1167 | /* Set basic environment. */ | |
1168 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1169 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1170 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
2e73a022 | 1171 | #ifdef HAVE_LOGIN_CAP |
1172 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH); | |
1173 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1174 | #else /* HAVE_LOGIN_CAP */ |
1175 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1176 | /* |
1177 | * There's no standard path on Windows. The path contains | |
1178 | * important components pointing to the system directories, | |
1179 | * needed for loading shared libraries. So the path better | |
1180 | * remains intact here. | |
1181 | */ | |
7368a6c8 | 1182 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
22d89d24 | 1183 | # endif /* HAVE_CYGWIN */ |
1184 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1185 | |
1186 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1187 | _PATH_MAILDIR, pw->pw_name); | |
1188 | child_set_env(&env, &envsize, "MAIL", buf); | |
1189 | ||
1190 | /* Normal systems set SHELL by default. */ | |
1191 | child_set_env(&env, &envsize, "SHELL", shell); | |
1192 | } | |
1193 | if (getenv("TZ")) | |
1194 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1195 | ||
1196 | /* Set custom environment options from RSA authentication. */ | |
1197 | while (custom_environment) { | |
1198 | struct envstring *ce = custom_environment; | |
1199 | char *s = ce->s; | |
1200 | int i; | |
1201 | for (i = 0; s[i] != '=' && s[i]; i++); | |
1202 | if (s[i] == '=') { | |
1203 | s[i] = 0; | |
1204 | child_set_env(&env, &envsize, s, s + i + 1); | |
1205 | } | |
1206 | custom_environment = ce->next; | |
1207 | xfree(ce->s); | |
1208 | xfree(ce); | |
1209 | } | |
1210 | ||
1211 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
1212 | get_remote_ipaddr(), get_remote_port(), get_local_port()); | |
1213 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); | |
1214 | ||
1215 | if (ttyname) | |
1216 | child_set_env(&env, &envsize, "SSH_TTY", ttyname); | |
1217 | if (term) | |
1218 | child_set_env(&env, &envsize, "TERM", term); | |
1219 | if (display) | |
1220 | child_set_env(&env, &envsize, "DISPLAY", display); | |
b5e300c2 | 1221 | if (original_command) |
1222 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1223 | original_command); | |
7368a6c8 | 1224 | |
1225 | #ifdef _AIX | |
22d89d24 | 1226 | if ((cp = getenv("AUTHSTATE")) != NULL) |
1227 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1228 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1229 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1230 | read_environment_file(&env, &envsize, "/etc/environment"); | |
7368a6c8 | 1231 | #endif |
1232 | ||
1233 | #ifdef KRB4 | |
1234 | { | |
1235 | extern char *ticket; | |
1236 | ||
1237 | if (ticket) | |
1238 | child_set_env(&env, &envsize, "KRBTKFILE", ticket); | |
1239 | } | |
1240 | #endif /* KRB4 */ | |
1241 | ||
1242 | #ifdef USE_PAM | |
1243 | /* Pull in any environment variables that may have been set by PAM. */ | |
1244 | do_pam_environment(&env, &envsize); | |
1245 | #endif /* USE_PAM */ | |
1246 | ||
7368a6c8 | 1247 | if (xauthfile) |
1248 | child_set_env(&env, &envsize, "XAUTHORITY", xauthfile); | |
1249 | if (auth_get_socket_name() != NULL) | |
1250 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, | |
1251 | auth_get_socket_name()); | |
1252 | ||
1253 | /* read $HOME/.ssh/environment. */ | |
1254 | if (!options.use_login) { | |
71276795 | 1255 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1256 | pw->pw_dir); | |
7368a6c8 | 1257 | read_environment_file(&env, &envsize, buf); |
1258 | } | |
1259 | if (debug_flag) { | |
1260 | /* dump the environment */ | |
1261 | fprintf(stderr, "Environment:\n"); | |
1262 | for (i = 0; env[i]; i++) | |
1263 | fprintf(stderr, " %.200s\n", env[i]); | |
1264 | } | |
2e73a022 | 1265 | /* we have to stash the hostname before we close our socket. */ |
1266 | if (options.use_login) | |
1267 | hostname = get_remote_name_or_ip(); | |
7368a6c8 | 1268 | /* |
1269 | * Close the connection descriptors; note that this is the child, and | |
1270 | * the server will still have the socket open, and it is important | |
1271 | * that we do not shutdown it. Note that the descriptors cannot be | |
1272 | * closed before building the environment, as we call | |
1273 | * get_remote_ipaddr there. | |
1274 | */ | |
1275 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1276 | close(packet_get_connection_in()); | |
1277 | else { | |
1278 | close(packet_get_connection_in()); | |
1279 | close(packet_get_connection_out()); | |
1280 | } | |
1281 | /* | |
1282 | * Close all descriptors related to channels. They will still remain | |
1283 | * open in the parent. | |
1284 | */ | |
1285 | /* XXX better use close-on-exec? -markus */ | |
1286 | channel_close_all(); | |
1287 | ||
1288 | /* | |
1289 | * Close any extra file descriptors. Note that there may still be | |
1290 | * descriptors left by system functions. They will be closed later. | |
1291 | */ | |
1292 | endpwent(); | |
1293 | ||
1294 | /* | |
1295 | * Close any extra open file descriptors so that we don\'t have them | |
1296 | * hanging around in clients. Note that we want to do this after | |
1297 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1298 | * descriptors open. | |
1299 | */ | |
1300 | for (i = 3; i < 64; i++) | |
1301 | close(i); | |
1302 | ||
1303 | /* Change current directory to the user\'s home directory. */ | |
2e73a022 | 1304 | if (chdir(pw->pw_dir) < 0) { |
7368a6c8 | 1305 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", |
1306 | pw->pw_dir, strerror(errno)); | |
2e73a022 | 1307 | #ifdef HAVE_LOGIN_CAP |
1308 | if (login_getcapbool(lc, "requirehome", 0)) | |
1309 | exit(1); | |
1310 | #endif | |
1311 | } | |
7368a6c8 | 1312 | |
1313 | /* | |
1314 | * Must take new environment into use so that .ssh/rc, /etc/sshrc and | |
1315 | * xauth are run in the proper environment. | |
1316 | */ | |
1317 | environ = env; | |
1318 | ||
1319 | /* | |
1320 | * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first | |
1321 | * in this order). | |
1322 | */ | |
1323 | if (!options.use_login) { | |
42f11eb2 | 1324 | if (stat(_PATH_SSH_USER_RC, &st) >= 0) { |
7368a6c8 | 1325 | if (debug_flag) |
42f11eb2 | 1326 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, _PATH_SSH_USER_RC); |
7368a6c8 | 1327 | |
42f11eb2 | 1328 | f = popen(_PATH_BSHELL " " _PATH_SSH_USER_RC, "w"); |
7368a6c8 | 1329 | if (f) { |
1330 | if (auth_proto != NULL && auth_data != NULL) | |
1331 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1332 | pclose(f); | |
1333 | } else | |
42f11eb2 | 1334 | fprintf(stderr, "Could not run %s\n", _PATH_SSH_USER_RC); |
1335 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
7368a6c8 | 1336 | if (debug_flag) |
42f11eb2 | 1337 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, _PATH_SSH_SYSTEM_RC); |
7368a6c8 | 1338 | |
42f11eb2 | 1339 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); |
7368a6c8 | 1340 | if (f) { |
1341 | if (auth_proto != NULL && auth_data != NULL) | |
1342 | fprintf(f, "%s %s\n", auth_proto, auth_data); | |
1343 | pclose(f); | |
1344 | } else | |
42f11eb2 | 1345 | fprintf(stderr, "Could not run %s\n", _PATH_SSH_SYSTEM_RC); |
6fc1e9f3 | 1346 | } else if (options.xauth_location != NULL) { |
7368a6c8 | 1347 | /* Add authority data to .Xauthority if appropriate. */ |
1348 | if (auth_proto != NULL && auth_data != NULL) { | |
29611d9c | 1349 | char *screen = strchr(display, ':'); |
1350 | if (debug_flag) { | |
71276795 | 1351 | fprintf(stderr, |
1352 | "Running %.100s add %.100s %.100s %.100s\n", | |
6fc1e9f3 | 1353 | options.xauth_location, display, |
1354 | auth_proto, auth_data); | |
7322ef0e | 1355 | #ifndef HAVE_CYGWIN /* Unix sockets are not supported */ |
29611d9c | 1356 | if (screen != NULL) |
71276795 | 1357 | fprintf(stderr, |
1358 | "Adding %.*s/unix%s %s %s\n", | |
14a9a859 | 1359 | (int)(screen-display), display, |
71276795 | 1360 | screen, auth_proto, auth_data); |
7322ef0e | 1361 | #endif |
29611d9c | 1362 | } |
6fc1e9f3 | 1363 | snprintf(cmd, sizeof cmd, "%s -q -", |
1364 | options.xauth_location); | |
1365 | f = popen(cmd, "w"); | |
7368a6c8 | 1366 | if (f) { |
71276795 | 1367 | fprintf(f, "add %s %s %s\n", display, |
1368 | auth_proto, auth_data); | |
7322ef0e | 1369 | #ifndef HAVE_CYGWIN /* Unix sockets are not supported */ |
2b87da3b | 1370 | if (screen != NULL) |
29611d9c | 1371 | fprintf(f, "add %.*s/unix%s %s %s\n", |
14a9a859 | 1372 | (int)(screen-display), display, |
71276795 | 1373 | screen, auth_proto, auth_data); |
7322ef0e | 1374 | #endif |
7368a6c8 | 1375 | pclose(f); |
6fc1e9f3 | 1376 | } else { |
1377 | fprintf(stderr, "Could not run %s\n", | |
1378 | cmd); | |
1379 | } | |
7368a6c8 | 1380 | } |
1381 | } | |
7368a6c8 | 1382 | /* Get the last component of the shell name. */ |
1383 | cp = strrchr(shell, '/'); | |
1384 | if (cp) | |
1385 | cp++; | |
1386 | else | |
1387 | cp = shell; | |
1388 | } | |
1389 | /* | |
1390 | * If we have no command, execute the shell. In this case, the shell | |
1391 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1392 | * this is a login shell. | |
1393 | */ | |
1394 | if (!command) { | |
1395 | if (!options.use_login) { | |
1396 | char buf[256]; | |
1397 | ||
1398 | /* | |
1399 | * Check for mail if we have a tty and it was enabled | |
1400 | * in server options. | |
1401 | */ | |
1402 | if (ttyname && options.check_mail) { | |
1403 | char *mailbox; | |
1404 | struct stat mailstat; | |
1405 | mailbox = getenv("MAIL"); | |
1406 | if (mailbox != NULL) { | |
71276795 | 1407 | if (stat(mailbox, &mailstat) != 0 || |
1408 | mailstat.st_size == 0) | |
7368a6c8 | 1409 | printf("No mail.\n"); |
1410 | else if (mailstat.st_mtime < mailstat.st_atime) | |
1411 | printf("You have mail.\n"); | |
1412 | else | |
1413 | printf("You have new mail.\n"); | |
1414 | } | |
1415 | } | |
1416 | /* Start the shell. Set initial character to '-'. */ | |
1417 | buf[0] = '-'; | |
1418 | strncpy(buf + 1, cp, sizeof(buf) - 1); | |
1419 | buf[sizeof(buf) - 1] = 0; | |
1420 | ||
1421 | /* Execute the shell. */ | |
1422 | argv[0] = buf; | |
1423 | argv[1] = NULL; | |
1424 | execve(shell, argv, env); | |
1425 | ||
1426 | /* Executing the shell failed. */ | |
1427 | perror(shell); | |
1428 | exit(1); | |
1429 | ||
1430 | } else { | |
1431 | /* Launch login(1). */ | |
1432 | ||
2e73a022 | 1433 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
c345cf9d | 1434 | "-p", "-f", "--", pw->pw_name, NULL); |
7368a6c8 | 1435 | |
1436 | /* Login couldn't be executed, die. */ | |
1437 | ||
1438 | perror("login"); | |
1439 | exit(1); | |
1440 | } | |
1441 | } | |
1442 | /* | |
1443 | * Execute the command using the user's shell. This uses the -c | |
1444 | * option to execute the command. | |
1445 | */ | |
1446 | argv[0] = (char *) cp; | |
1447 | argv[1] = "-c"; | |
1448 | argv[2] = (char *) command; | |
1449 | argv[3] = NULL; | |
1450 | execve(shell, argv, env); | |
1451 | perror(shell); | |
1452 | exit(1); | |
1453 | } | |
1454 | ||
1455 | Session * | |
1456 | session_new(void) | |
1457 | { | |
1458 | int i; | |
1459 | static int did_init = 0; | |
1460 | if (!did_init) { | |
1461 | debug("session_new: init"); | |
1462 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1463 | sessions[i].used = 0; | |
1464 | sessions[i].self = i; | |
1465 | } | |
1466 | did_init = 1; | |
1467 | } | |
1468 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1469 | Session *s = &sessions[i]; | |
1470 | if (! s->used) { | |
1471 | s->pid = 0; | |
0b242b12 | 1472 | s->extended = 0; |
7368a6c8 | 1473 | s->chanid = -1; |
1474 | s->ptyfd = -1; | |
1475 | s->ttyfd = -1; | |
1476 | s->term = NULL; | |
1477 | s->pw = NULL; | |
1478 | s->display = NULL; | |
1479 | s->screen = 0; | |
1480 | s->auth_data = NULL; | |
1481 | s->auth_proto = NULL; | |
1482 | s->used = 1; | |
0b242b12 | 1483 | s->pw = NULL; |
02323c45 | 1484 | debug("session_new: session %d", i); |
7368a6c8 | 1485 | return s; |
1486 | } | |
1487 | } | |
1488 | return NULL; | |
1489 | } | |
1490 | ||
1491 | void | |
1492 | session_dump(void) | |
1493 | { | |
1494 | int i; | |
1495 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1496 | Session *s = &sessions[i]; | |
1497 | debug("dump: used %d session %d %p channel %d pid %d", | |
1498 | s->used, | |
1499 | s->self, | |
1500 | s, | |
1501 | s->chanid, | |
1502 | s->pid); | |
1503 | } | |
1504 | } | |
1505 | ||
e78a59f5 | 1506 | int |
1507 | session_open(int chanid) | |
1508 | { | |
1509 | Session *s = session_new(); | |
1510 | debug("session_open: channel %d", chanid); | |
1511 | if (s == NULL) { | |
1512 | error("no more sessions"); | |
1513 | return 0; | |
1514 | } | |
e78a59f5 | 1515 | s->pw = auth_get_user(); |
1516 | if (s->pw == NULL) | |
0725ea77 | 1517 | fatal("no user for session %d", s->self); |
0b242b12 | 1518 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1519 | s->chanid = chanid; | |
e78a59f5 | 1520 | return 1; |
1521 | } | |
1522 | ||
1523 | Session * | |
1524 | session_by_channel(int id) | |
1525 | { | |
1526 | int i; | |
1527 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1528 | Session *s = &sessions[i]; | |
1529 | if (s->used && s->chanid == id) { | |
1530 | debug("session_by_channel: session %d channel %d", i, id); | |
1531 | return s; | |
1532 | } | |
1533 | } | |
1534 | debug("session_by_channel: unknown channel %d", id); | |
1535 | session_dump(); | |
1536 | return NULL; | |
1537 | } | |
1538 | ||
1539 | Session * | |
1540 | session_by_pid(pid_t pid) | |
1541 | { | |
1542 | int i; | |
1543 | debug("session_by_pid: pid %d", pid); | |
1544 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1545 | Session *s = &sessions[i]; | |
1546 | if (s->used && s->pid == pid) | |
1547 | return s; | |
1548 | } | |
1549 | error("session_by_pid: unknown pid %d", pid); | |
1550 | session_dump(); | |
1551 | return NULL; | |
1552 | } | |
1553 | ||
1554 | int | |
1555 | session_window_change_req(Session *s) | |
1556 | { | |
1557 | s->col = packet_get_int(); | |
1558 | s->row = packet_get_int(); | |
1559 | s->xpixel = packet_get_int(); | |
1560 | s->ypixel = packet_get_int(); | |
6ae2364d | 1561 | packet_done(); |
e78a59f5 | 1562 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1563 | return 1; | |
1564 | } | |
1565 | ||
1566 | int | |
1567 | session_pty_req(Session *s) | |
1568 | { | |
1e3b8b07 | 1569 | u_int len; |
6ae2364d | 1570 | char *term_modes; /* encoded terminal modes */ |
e78a59f5 | 1571 | |
38c295d6 | 1572 | if (no_pty_flag) |
1573 | return 0; | |
e78a59f5 | 1574 | if (s->ttyfd != -1) |
6ae2364d | 1575 | return 0; |
e78a59f5 | 1576 | s->term = packet_get_string(&len); |
1577 | s->col = packet_get_int(); | |
1578 | s->row = packet_get_int(); | |
1579 | s->xpixel = packet_get_int(); | |
1580 | s->ypixel = packet_get_int(); | |
6ae2364d | 1581 | term_modes = packet_get_string(&len); |
1582 | packet_done(); | |
e78a59f5 | 1583 | |
1584 | if (strcmp(s->term, "") == 0) { | |
1585 | xfree(s->term); | |
1586 | s->term = NULL; | |
1587 | } | |
1588 | /* Allocate a pty and open it. */ | |
1589 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) { | |
1590 | xfree(s->term); | |
1591 | s->term = NULL; | |
1592 | s->ptyfd = -1; | |
1593 | s->ttyfd = -1; | |
1594 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1595 | xfree(term_modes); |
1596 | return 0; | |
e78a59f5 | 1597 | } |
1598 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1599 | /* | |
1600 | * Add a cleanup function to clear the utmp entry and record logout | |
1601 | * time in case we call fatal() (e.g., the connection gets closed). | |
1602 | */ | |
1603 | fatal_add_cleanup(pty_cleanup_proc, (void *)s); | |
1604 | pty_setowner(s->pw, s->tty); | |
1605 | /* Get window size from the packet. */ | |
1606 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1607 | ||
1d1ffb87 | 1608 | session_proctitle(s); |
1609 | ||
35484284 | 1610 | /* XXX parse and set terminal modes */ |
1611 | xfree(term_modes); | |
e78a59f5 | 1612 | return 1; |
1613 | } | |
1614 | ||
0b242b12 | 1615 | int |
1616 | session_subsystem_req(Session *s) | |
1617 | { | |
1e3b8b07 | 1618 | u_int len; |
0b242b12 | 1619 | int success = 0; |
1620 | char *subsys = packet_get_string(&len); | |
38c295d6 | 1621 | int i; |
0b242b12 | 1622 | |
1623 | packet_done(); | |
1624 | log("subsystem request for %s", subsys); | |
1625 | ||
38c295d6 | 1626 | for (i = 0; i < options.num_subsystems; i++) { |
1627 | if(strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1628 | debug("subsystem: exec() %s", options.subsystem_command[i]); | |
1629 | do_exec_no_pty(s, options.subsystem_command[i], s->pw); | |
1630 | success = 1; | |
1631 | } | |
1632 | } | |
1633 | ||
1634 | if (!success) | |
1635 | log("subsystem request for %s failed, subsystem not found", subsys); | |
1636 | ||
0b242b12 | 1637 | xfree(subsys); |
1638 | return success; | |
1639 | } | |
1640 | ||
1641 | int | |
1642 | session_x11_req(Session *s) | |
1643 | { | |
b5e300c2 | 1644 | int fd; |
089fbbd2 | 1645 | if (no_x11_forwarding_flag) { |
38c295d6 | 1646 | debug("X11 forwarding disabled in user configuration file."); |
1647 | return 0; | |
1648 | } | |
0b242b12 | 1649 | if (!options.x11_forwarding) { |
1650 | debug("X11 forwarding disabled in server configuration file."); | |
1651 | return 0; | |
1652 | } | |
1653 | if (xauthfile != NULL) { | |
1654 | debug("X11 fwd already started."); | |
1655 | return 0; | |
1656 | } | |
1657 | ||
1658 | debug("Received request for X11 forwarding with auth spoofing."); | |
1659 | if (s->display != NULL) | |
1660 | packet_disconnect("Protocol error: X11 display already set."); | |
1661 | ||
1662 | s->single_connection = packet_get_char(); | |
1663 | s->auth_proto = packet_get_string(NULL); | |
1664 | s->auth_data = packet_get_string(NULL); | |
1665 | s->screen = packet_get_int(); | |
1666 | packet_done(); | |
1667 | ||
1668 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); | |
1669 | if (s->display == NULL) { | |
1670 | xfree(s->auth_proto); | |
1671 | xfree(s->auth_data); | |
1672 | return 0; | |
1673 | } | |
1674 | xauthfile = xmalloc(MAXPATHLEN); | |
1675 | strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
1676 | temporarily_use_uid(s->pw->pw_uid); | |
1677 | if (mkdtemp(xauthfile) == NULL) { | |
1678 | restore_uid(); | |
1679 | error("private X11 dir: mkdtemp %s failed: %s", | |
1680 | xauthfile, strerror(errno)); | |
1681 | xfree(xauthfile); | |
1682 | xauthfile = NULL; | |
1683 | xfree(s->auth_proto); | |
1684 | xfree(s->auth_data); | |
1685 | /* XXXX remove listening channels */ | |
1686 | return 0; | |
1687 | } | |
1688 | strlcat(xauthfile, "/cookies", MAXPATHLEN); | |
b5e300c2 | 1689 | fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
1690 | if (fd >= 0) | |
1691 | close(fd); | |
0b242b12 | 1692 | restore_uid(); |
1693 | fatal_add_cleanup(xauthfile_cleanup_proc, s); | |
1694 | return 1; | |
1695 | } | |
1696 | ||
38c295d6 | 1697 | int |
1698 | session_shell_req(Session *s) | |
1699 | { | |
1700 | /* if forced_command == NULL, the shell is execed */ | |
1701 | char *shell = forced_command; | |
1702 | packet_done(); | |
1703 | s->extended = 1; | |
1704 | if (s->ttyfd == -1) | |
1705 | do_exec_no_pty(s, shell, s->pw); | |
1706 | else | |
1707 | do_exec_pty(s, shell, s->pw); | |
1708 | return 1; | |
1709 | } | |
1710 | ||
1711 | int | |
1712 | session_exec_req(Session *s) | |
1713 | { | |
1e3b8b07 | 1714 | u_int len; |
38c295d6 | 1715 | char *command = packet_get_string(&len); |
1716 | packet_done(); | |
1717 | if (forced_command) { | |
b5e300c2 | 1718 | original_command = command; |
38c295d6 | 1719 | command = forced_command; |
1720 | debug("Forced command '%.500s'", forced_command); | |
1721 | } | |
1722 | s->extended = 1; | |
1723 | if (s->ttyfd == -1) | |
1724 | do_exec_no_pty(s, command, s->pw); | |
1725 | else | |
1726 | do_exec_pty(s, command, s->pw); | |
1727 | if (forced_command == NULL) | |
1728 | xfree(command); | |
1729 | return 1; | |
1730 | } | |
1731 | ||
fa08c86b | 1732 | int |
1733 | session_auth_agent_req(Session *s) | |
1734 | { | |
1735 | static int called = 0; | |
1736 | packet_done(); | |
d343d900 | 1737 | if (no_agent_forwarding_flag) { |
1738 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1739 | return 0; | |
1740 | } | |
fa08c86b | 1741 | if (called) { |
1742 | return 0; | |
1743 | } else { | |
1744 | called = 1; | |
1745 | return auth_input_request_forwarding(s->pw); | |
1746 | } | |
1747 | } | |
1748 | ||
e78a59f5 | 1749 | void |
1750 | session_input_channel_req(int id, void *arg) | |
1751 | { | |
1e3b8b07 | 1752 | u_int len; |
e78a59f5 | 1753 | int reply; |
1754 | int success = 0; | |
1755 | char *rtype; | |
1756 | Session *s; | |
1757 | Channel *c; | |
1758 | ||
1759 | rtype = packet_get_string(&len); | |
1760 | reply = packet_get_char(); | |
1761 | ||
1762 | s = session_by_channel(id); | |
1763 | if (s == NULL) | |
1764 | fatal("session_input_channel_req: channel %d: no session", id); | |
1765 | c = channel_lookup(id); | |
1766 | if (c == NULL) | |
1767 | fatal("session_input_channel_req: channel %d: bad channel", id); | |
1768 | ||
1769 | debug("session_input_channel_req: session %d channel %d request %s reply %d", | |
1770 | s->self, id, rtype, reply); | |
1771 | ||
1772 | /* | |
1773 | * a session is in LARVAL state until a shell | |
1774 | * or programm is executed | |
1775 | */ | |
1776 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1777 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1778 | success = session_shell_req(s); |
e78a59f5 | 1779 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1780 | success = session_exec_req(s); |
e78a59f5 | 1781 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1782 | success = session_pty_req(s); |
0b242b12 | 1783 | } else if (strcmp(rtype, "x11-req") == 0) { |
1784 | success = session_x11_req(s); | |
fa08c86b | 1785 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1786 | success = session_auth_agent_req(s); | |
0b242b12 | 1787 | } else if (strcmp(rtype, "subsystem") == 0) { |
1788 | success = session_subsystem_req(s); | |
e78a59f5 | 1789 | } |
1790 | } | |
1791 | if (strcmp(rtype, "window-change") == 0) { | |
1792 | success = session_window_change_req(s); | |
1793 | } | |
1794 | ||
1795 | if (reply) { | |
1796 | packet_start(success ? | |
1797 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1798 | packet_put_int(c->remote_id); | |
1799 | packet_send(); | |
1800 | } | |
1801 | xfree(rtype); | |
1802 | } | |
1803 | ||
1804 | void | |
1805 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1806 | { | |
1807 | if (!compat20) | |
1808 | fatal("session_set_fds: called for proto != 2.0"); | |
1809 | /* | |
1810 | * now that have a child and a pipe to the child, | |
1811 | * we can activate our channel and register the fd's | |
1812 | */ | |
1813 | if (s->chanid == -1) | |
1814 | fatal("no channel for session %d", s->self); | |
1815 | channel_set_fds(s->chanid, | |
1816 | fdout, fdin, fderr, | |
a22aff1f | 1817 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
1818 | 1); | |
e78a59f5 | 1819 | } |
1820 | ||
7368a6c8 | 1821 | void |
1822 | session_pty_cleanup(Session *s) | |
1823 | { | |
1824 | if (s == NULL || s->ttyfd == -1) | |
1825 | return; | |
1826 | ||
0725ea77 | 1827 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 1828 | |
1829 | /* Cancel the cleanup function. */ | |
1830 | fatal_remove_cleanup(pty_cleanup_proc, (void *)s); | |
1831 | ||
1832 | /* Record that the user has logged out. */ | |
1833 | record_logout(s->pid, s->tty); | |
1834 | ||
1835 | /* Release the pseudo-tty. */ | |
1836 | pty_release(s->tty); | |
1837 | ||
1838 | /* | |
1839 | * Close the server side of the socket pairs. We must do this after | |
1840 | * the pty cleanup, so that another process doesn't get this pty | |
1841 | * while we're still cleaning up. | |
1842 | */ | |
1843 | if (close(s->ptymaster) < 0) | |
1844 | error("close(s->ptymaster): %s", strerror(errno)); | |
1845 | } | |
e78a59f5 | 1846 | |
1847 | void | |
1848 | session_exit_message(Session *s, int status) | |
1849 | { | |
1850 | Channel *c; | |
1851 | if (s == NULL) | |
1852 | fatal("session_close: no session"); | |
1853 | c = channel_lookup(s->chanid); | |
1854 | if (c == NULL) | |
1855 | fatal("session_close: session %d: no channel %d", | |
1856 | s->self, s->chanid); | |
1857 | debug("session_exit_message: session %d channel %d pid %d", | |
1858 | s->self, s->chanid, s->pid); | |
1859 | ||
1860 | if (WIFEXITED(status)) { | |
1861 | channel_request_start(s->chanid, | |
1862 | "exit-status", 0); | |
1863 | packet_put_int(WEXITSTATUS(status)); | |
1864 | packet_send(); | |
1865 | } else if (WIFSIGNALED(status)) { | |
1866 | channel_request_start(s->chanid, | |
1867 | "exit-signal", 0); | |
1868 | packet_put_int(WTERMSIG(status)); | |
a64009ad | 1869 | #ifdef WCOREDUMP |
e78a59f5 | 1870 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1871 | #else /* WCOREDUMP */ |
1872 | packet_put_char(0); | |
1873 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1874 | packet_put_cstring(""); |
1875 | packet_put_cstring(""); | |
1876 | packet_send(); | |
1877 | } else { | |
1878 | /* Some weird exit cause. Just exit. */ | |
1879 | packet_disconnect("wait returned status %04x.", status); | |
1880 | } | |
1881 | ||
1882 | /* disconnect channel */ | |
1883 | debug("session_exit_message: release channel %d", s->chanid); | |
1884 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1885 | /* |
1886 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1887 | * interested in data we write. | |
1888 | * Note that we must not call 'chan_read_failed', since there could | |
1889 | * be some more data waiting in the pipe. | |
1890 | */ | |
0b242b12 | 1891 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1892 | chan_write_failed(c); | |
e78a59f5 | 1893 | s->chanid = -1; |
1894 | } | |
1895 | ||
1896 | void | |
1897 | session_free(Session *s) | |
1898 | { | |
1899 | debug("session_free: session %d pid %d", s->self, s->pid); | |
1900 | if (s->term) | |
1901 | xfree(s->term); | |
1902 | if (s->display) | |
1903 | xfree(s->display); | |
1904 | if (s->auth_data) | |
1905 | xfree(s->auth_data); | |
1906 | if (s->auth_proto) | |
1907 | xfree(s->auth_proto); | |
1908 | s->used = 0; | |
1909 | } | |
1910 | ||
1911 | void | |
1912 | session_close(Session *s) | |
1913 | { | |
1914 | session_pty_cleanup(s); | |
1915 | session_free(s); | |
1d1ffb87 | 1916 | session_proctitle(s); |
e78a59f5 | 1917 | } |
1918 | ||
1919 | void | |
1920 | session_close_by_pid(pid_t pid, int status) | |
1921 | { | |
1922 | Session *s = session_by_pid(pid); | |
1923 | if (s == NULL) { | |
1924 | debug("session_close_by_pid: no session for pid %d", s->pid); | |
1925 | return; | |
1926 | } | |
1927 | if (s->chanid != -1) | |
1928 | session_exit_message(s, status); | |
1929 | session_close(s); | |
1930 | } | |
1931 | ||
1932 | /* | |
1933 | * this is called when a channel dies before | |
1934 | * the session 'child' itself dies | |
1935 | */ | |
1936 | void | |
1937 | session_close_by_channel(int id, void *arg) | |
1938 | { | |
1939 | Session *s = session_by_channel(id); | |
1940 | if (s == NULL) { | |
1941 | debug("session_close_by_channel: no session for channel %d", id); | |
1942 | return; | |
1943 | } | |
1944 | /* disconnect channel */ | |
1945 | channel_cancel_cleanup(s->chanid); | |
1946 | s->chanid = -1; | |
1947 | ||
1948 | debug("session_close_by_channel: channel %d kill %d", id, s->pid); | |
1949 | if (s->pid == 0) { | |
1950 | /* close session immediately */ | |
1951 | session_close(s); | |
1952 | } else { | |
1953 | /* notify child, delay session cleanup */ | |
512ad3c0 | 1954 | if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0) |
e78a59f5 | 1955 | error("session_close_by_channel: kill %d: %s", |
1956 | s->pid, strerror(errno)); | |
1957 | } | |
1958 | } | |
1959 | ||
1d1ffb87 | 1960 | char * |
1961 | session_tty_list(void) | |
1962 | { | |
1963 | static char buf[1024]; | |
1964 | int i; | |
1965 | buf[0] = '\0'; | |
1966 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1967 | Session *s = &sessions[i]; | |
1968 | if (s->used && s->ttyfd != -1) { | |
1969 | if (buf[0] != '\0') | |
1970 | strlcat(buf, ",", sizeof buf); | |
1971 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1972 | } | |
1973 | } | |
1974 | if (buf[0] == '\0') | |
1975 | strlcpy(buf, "notty", sizeof buf); | |
1976 | return buf; | |
1977 | } | |
1978 | ||
1979 | void | |
1980 | session_proctitle(Session *s) | |
1981 | { | |
1982 | if (s->pw == NULL) | |
1983 | error("no user for session %d", s->self); | |
1984 | else | |
1985 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
1986 | } | |
1987 | ||
e78a59f5 | 1988 | void |
59c97189 | 1989 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 1990 | { |
1991 | /* | |
1992 | * Cancel the alarm we set to limit the time taken for | |
1993 | * authentication. | |
1994 | */ | |
1995 | alarm(0); | |
3f7a7e4a | 1996 | if (startup_pipe != -1) { |
5540ea9b | 1997 | close(startup_pipe); |
3f7a7e4a | 1998 | startup_pipe = -1; |
1999 | } | |
97994d32 | 2000 | #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD) |
59c97189 | 2001 | if ((lc = login_getclass(authctxt->pw->pw_class)) == NULL) { |
2e73a022 | 2002 | error("unable to get login class"); |
2003 | return; | |
2004 | } | |
2005 | #endif | |
e78a59f5 | 2006 | server_loop2(); |
34bce9a5 | 2007 | if (xauthfile) |
2008 | xauthfile_cleanup_proc(NULL); | |
e78a59f5 | 2009 | } |