blob: 74f5fe2558305f5e7e88e97e8a47d26c7d7ad077 [file] [log] [blame]
Damien Millerb38eff82000-04-01 11:09:21 +10001/*
2 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
3 * All rights reserved
Damien Millere4340be2000-09-16 13:29:08 +11004 *
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 *
Damien Millerefb4afe2000-04-12 18:45:05 +100011 * SSH2 support by Markus Friedl.
12 * Copyright (c) 2000 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110013 *
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.
Damien Millerefb4afe2000-04-12 18:45:05 +100033 */
Damien Millerb38eff82000-04-01 11:09:21 +100034
35#include "includes.h"
Ben Lindstromd26dcf32001-01-06 15:18:16 +000036RCSID("$OpenBSD: session.c,v 1.46 2001/01/04 22:41:03 markus Exp $");
Damien Millerb38eff82000-04-01 11:09:21 +100037
38#include "xmalloc.h"
39#include "ssh.h"
40#include "pty.h"
41#include "packet.h"
42#include "buffer.h"
Damien Millerb38eff82000-04-01 11:09:21 +100043#include "mpaux.h"
44#include "servconf.h"
45#include "uidswap.h"
46#include "compat.h"
47#include "channels.h"
48#include "nchan.h"
49
Damien Millerefb4afe2000-04-12 18:45:05 +100050#include "bufaux.h"
51#include "ssh2.h"
52#include "auth.h"
Damien Millerf6d9e222000-06-18 14:50:44 +100053#include "auth-options.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100054
Damien Miller91606b12000-06-28 08:22:29 +100055#ifdef WITH_IRIX_PROJECT
56#include <proj.h>
57#endif /* WITH_IRIX_PROJECT */
Ben Lindstrom980754c2000-11-12 00:04:24 +000058#ifdef WITH_IRIX_JOBS
59#include <sys/resource.h>
Ben Lindstrom49a79c02000-11-17 03:47:20 +000060#endif
61#ifdef WITH_IRIX_AUDIT
62#include <sat.h>
63#endif /* WITH_IRIX_AUDIT */
Damien Miller91606b12000-06-28 08:22:29 +100064
Damien Miller37023962000-07-11 17:31:38 +100065#if defined(HAVE_USERSEC_H)
66#include <usersec.h>
67#endif
68
Damien Millerb8c656e2000-06-28 15:22:41 +100069#ifdef HAVE_OSF_SIA
70# include <sia.h>
71# include <siad.h>
72#endif
73
Damien Millerbac2d8a2000-09-05 16:13:06 +110074#ifdef HAVE_CYGWIN
75#include <windows.h>
76#include <sys/cygwin.h>
77#define is_winnt (GetVersion() < 0x80000000)
78#endif
79
Damien Millerd17b8d52000-08-09 14:42:28 +100080/* AIX limits */
81#if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE)
Damien Miller0da2eaa2000-08-15 11:32:59 +100082# define S_UFSIZE_HARD S_UFSIZE "_hard"
83# define S_UCPU_HARD S_UCPU "_hard"
84# define S_UDATA_HARD S_UDATA "_hard"
85# define S_USTACK_HARD S_USTACK "_hard"
86# define S_URSS_HARD S_URSS "_hard"
87# define S_UCORE_HARD S_UCORE "_hard"
88# define S_UNOFILE_HARD S_UNOFILE "_hard"
Damien Millerd17b8d52000-08-09 14:42:28 +100089#endif
90
Damien Millerad833b32000-08-23 10:46:23 +100091#ifdef HAVE_LOGIN_CAP
92#include <login_cap.h>
93#endif
94
Damien Millerb38eff82000-04-01 11:09:21 +100095/* types */
96
97#define TTYSZ 64
98typedef struct Session Session;
99struct Session {
100 int used;
101 int self;
Damien Millerbd483e72000-04-30 10:00:53 +1000102 int extended;
Damien Millerb38eff82000-04-01 11:09:21 +1000103 struct passwd *pw;
104 pid_t pid;
105 /* tty */
106 char *term;
107 int ptyfd, ttyfd, ptymaster;
108 int row, col, xpixel, ypixel;
109 char tty[TTYSZ];
110 /* X11 */
111 char *display;
112 int screen;
113 char *auth_proto;
114 char *auth_data;
Damien Millerbd483e72000-04-30 10:00:53 +1000115 int single_connection;
Damien Millerb38eff82000-04-01 11:09:21 +1000116 /* proto 2 */
117 int chanid;
118};
119
120/* func */
121
122Session *session_new(void);
123void session_set_fds(Session *s, int fdin, int fdout, int fderr);
124void session_pty_cleanup(Session *s);
Damien Millere247cc42000-05-07 12:03:14 +1000125void session_proctitle(Session *s);
Damien Millerb38eff82000-04-01 11:09:21 +1000126void do_exec_pty(Session *s, const char *command, struct passwd * pw);
127void do_exec_no_pty(Session *s, const char *command, struct passwd * pw);
Damien Miller69b69aa2000-10-28 14:19:58 +1100128void do_login(Session *s, const char *command);
Damien Millerb38eff82000-04-01 11:09:21 +1000129
130void
131do_child(const char *command, struct passwd * pw, const char *term,
132 const char *display, const char *auth_proto,
133 const char *auth_data, const char *ttyname);
134
135/* import */
136extern ServerOptions options;
137extern char *__progname;
138extern int log_stderr;
139extern int debug_flag;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000140extern u_int utmp_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000141
Damien Miller37023962000-07-11 17:31:38 +1000142extern int startup_pipe;
143
Damien Millerb38eff82000-04-01 11:09:21 +1000144/* Local Xauthority file. */
145static char *xauthfile;
146
Damien Miller7b28dc52000-09-05 13:34:53 +1100147/* original command from peer. */
148char *original_command = NULL;
149
Damien Millerb38eff82000-04-01 11:09:21 +1000150/* data */
151#define MAX_SESSIONS 10
152Session sessions[MAX_SESSIONS];
Damien Miller15e7d4b2000-09-29 10:57:35 +1100153
Damien Millerd2c208a2000-05-17 22:00:02 +1000154#ifdef WITH_AIXAUTHENTICATE
155/* AIX's lastlogin message, set in auth1.c */
156char *aixloginmsg;
157#endif /* WITH_AIXAUTHENTICATE */
Damien Millerb38eff82000-04-01 11:09:21 +1000158
Damien Millerad833b32000-08-23 10:46:23 +1000159#ifdef HAVE_LOGIN_CAP
160static login_cap_t *lc;
161#endif
162
Damien Millerb38eff82000-04-01 11:09:21 +1000163/*
164 * Remove local Xauthority file.
165 */
166void
167xauthfile_cleanup_proc(void *ignore)
168{
169 debug("xauthfile_cleanup_proc called");
170
171 if (xauthfile != NULL) {
172 char *p;
173 unlink(xauthfile);
174 p = strrchr(xauthfile, '/');
175 if (p != NULL) {
176 *p = '\0';
177 rmdir(xauthfile);
178 }
179 xfree(xauthfile);
180 xauthfile = NULL;
181 }
182}
183
184/*
185 * Function to perform cleanup if we get aborted abnormally (e.g., due to a
186 * dropped connection).
187 */
Damien Miller4af51302000-04-16 11:18:38 +1000188void
Damien Millerb38eff82000-04-01 11:09:21 +1000189pty_cleanup_proc(void *session)
190{
191 Session *s=session;
192 if (s == NULL)
193 fatal("pty_cleanup_proc: no session");
194 debug("pty_cleanup_proc: %s", s->tty);
195
196 if (s->pid != 0) {
197 /* Record that the user has logged out. */
198 record_logout(s->pid, s->tty);
199 }
200
201 /* Release the pseudo-tty. */
202 pty_release(s->tty);
203}
204
205/*
206 * Prepares for an interactive session. This is called after the user has
207 * been successfully authenticated. During this message exchange, pseudo
208 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
209 * are requested, etc.
210 */
Damien Miller4af51302000-04-16 11:18:38 +1000211void
Damien Millerb38eff82000-04-01 11:09:21 +1000212do_authenticated(struct passwd * pw)
213{
214 Session *s;
Damien Miller7b28dc52000-09-05 13:34:53 +1100215 int type, fd;
Damien Millerb38eff82000-04-01 11:09:21 +1000216 int compression_level = 0, enable_compression_after_reply = 0;
217 int have_pty = 0;
218 char *command;
219 int n_bytes;
220 int plen;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000221 u_int proto_len, data_len, dlen;
Damien Millerb38eff82000-04-01 11:09:21 +1000222
223 /*
224 * Cancel the alarm we set to limit the time taken for
225 * authentication.
226 */
227 alarm(0);
Damien Miller182ee6e2000-07-12 09:45:27 +1000228 if (startup_pipe != -1) {
Damien Miller4d97ba22000-07-11 18:15:50 +1000229 close(startup_pipe);
Damien Miller182ee6e2000-07-12 09:45:27 +1000230 startup_pipe = -1;
231 }
Damien Millerb38eff82000-04-01 11:09:21 +1000232
233 /*
234 * Inform the channel mechanism that we are the server side and that
235 * the client may request to connect to any port at all. (The user
236 * could do it anyway, and we wouldn\'t know what is permitted except
237 * by the client telling us, so we can equally well trust the client
238 * not to request anything bogus.)
239 */
Damien Miller50a41ed2000-10-16 12:14:42 +1100240 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
Damien Millerb38eff82000-04-01 11:09:21 +1000241 channel_permit_all_opens();
242
243 s = session_new();
Damien Millerbd483e72000-04-30 10:00:53 +1000244 s->pw = pw;
Damien Millerb38eff82000-04-01 11:09:21 +1000245
Kevin Steves48b7cc02000-10-07 13:24:00 +0000246#if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
Damien Millerad833b32000-08-23 10:46:23 +1000247 if ((lc = login_getclass(pw->pw_class)) == NULL) {
248 error("unable to get login class");
249 return;
250 }
251#endif
252
Damien Millerb38eff82000-04-01 11:09:21 +1000253 /*
254 * We stay in this loop until the client requests to execute a shell
255 * or a command.
256 */
257 for (;;) {
258 int success = 0;
259
260 /* Get a packet from the client. */
261 type = packet_read(&plen);
262
263 /* Process the packet. */
264 switch (type) {
265 case SSH_CMSG_REQUEST_COMPRESSION:
266 packet_integrity_check(plen, 4, type);
267 compression_level = packet_get_int();
268 if (compression_level < 1 || compression_level > 9) {
269 packet_send_debug("Received illegal compression level %d.",
270 compression_level);
271 break;
272 }
273 /* Enable compression after we have responded with SUCCESS. */
274 enable_compression_after_reply = 1;
275 success = 1;
276 break;
277
278 case SSH_CMSG_REQUEST_PTY:
279 if (no_pty_flag) {
280 debug("Allocating a pty not permitted for this authentication.");
281 break;
282 }
283 if (have_pty)
284 packet_disconnect("Protocol error: you already have a pty.");
285
286 debug("Allocating pty.");
287
288 /* Allocate a pty and open it. */
289 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty,
290 sizeof(s->tty))) {
291 error("Failed to allocate pty.");
292 break;
293 }
294 fatal_add_cleanup(pty_cleanup_proc, (void *)s);
295 pty_setowner(pw, s->tty);
296
297 /* Get TERM from the packet. Note that the value may be of arbitrary length. */
298 s->term = packet_get_string(&dlen);
299 packet_integrity_check(dlen, strlen(s->term), type);
300 /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */
301 /* Remaining bytes */
302 n_bytes = plen - (4 + dlen + 4 * 4);
303
304 if (strcmp(s->term, "") == 0) {
305 xfree(s->term);
306 s->term = NULL;
307 }
308 /* Get window size from the packet. */
309 s->row = packet_get_int();
310 s->col = packet_get_int();
311 s->xpixel = packet_get_int();
312 s->ypixel = packet_get_int();
313 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
314
315 /* Get tty modes from the packet. */
316 tty_parse_modes(s->ttyfd, &n_bytes);
317 packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type);
318
Damien Millere247cc42000-05-07 12:03:14 +1000319 session_proctitle(s);
320
Damien Millerb38eff82000-04-01 11:09:21 +1000321 /* Indicate that we now have a pty. */
322 success = 1;
323 have_pty = 1;
324 break;
325
326 case SSH_CMSG_X11_REQUEST_FORWARDING:
327 if (!options.x11_forwarding) {
328 packet_send_debug("X11 forwarding disabled in server configuration file.");
329 break;
330 }
Damien Miller0c043c12000-06-07 21:22:38 +1000331 if (!options.xauth_location) {
332 packet_send_debug("No xauth program; cannot forward with spoofing.");
333 break;
334 }
Damien Millerb38eff82000-04-01 11:09:21 +1000335 if (no_x11_forwarding_flag) {
336 packet_send_debug("X11 forwarding not permitted for this authentication.");
337 break;
338 }
339 debug("Received request for X11 forwarding with auth spoofing.");
340 if (s->display != NULL)
341 packet_disconnect("Protocol error: X11 display already set.");
342
343 s->auth_proto = packet_get_string(&proto_len);
344 s->auth_data = packet_get_string(&data_len);
345 packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type);
346
347 if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER)
348 s->screen = packet_get_int();
349 else
350 s->screen = 0;
351 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
352
353 if (s->display == NULL)
354 break;
355
356 /* Setup to always have a local .Xauthority. */
357 xauthfile = xmalloc(MAXPATHLEN);
358 strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
359 temporarily_use_uid(pw->pw_uid);
360 if (mkdtemp(xauthfile) == NULL) {
361 restore_uid();
362 error("private X11 dir: mkdtemp %s failed: %s",
363 xauthfile, strerror(errno));
364 xfree(xauthfile);
365 xauthfile = NULL;
Damien Millerbd483e72000-04-30 10:00:53 +1000366 /* XXXX remove listening channels */
Damien Millerb38eff82000-04-01 11:09:21 +1000367 break;
368 }
369 strlcat(xauthfile, "/cookies", MAXPATHLEN);
Damien Miller7b28dc52000-09-05 13:34:53 +1100370 fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
371 if (fd >= 0)
372 close(fd);
Damien Millerb38eff82000-04-01 11:09:21 +1000373 restore_uid();
374 fatal_add_cleanup(xauthfile_cleanup_proc, NULL);
375 success = 1;
376 break;
Damien Millerb38eff82000-04-01 11:09:21 +1000377
378 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
379 if (no_agent_forwarding_flag || compat13) {
380 debug("Authentication agent forwarding not permitted for this authentication.");
381 break;
382 }
383 debug("Received authentication agent forwarding request.");
Damien Miller0c043c12000-06-07 21:22:38 +1000384 success = auth_input_request_forwarding(pw);
Damien Millerb38eff82000-04-01 11:09:21 +1000385 break;
386
387 case SSH_CMSG_PORT_FORWARD_REQUEST:
388 if (no_port_forwarding_flag) {
389 debug("Port forwarding not permitted for this authentication.");
390 break;
391 }
Damien Miller50a41ed2000-10-16 12:14:42 +1100392 if (!options.allow_tcp_forwarding) {
393 debug("Port forwarding not permitted.");
394 break;
395 }
Damien Millerb38eff82000-04-01 11:09:21 +1000396 debug("Received TCP/IP port forwarding request.");
Damien Millere247cc42000-05-07 12:03:14 +1000397 channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports);
Damien Millerb38eff82000-04-01 11:09:21 +1000398 success = 1;
399 break;
400
401 case SSH_CMSG_MAX_PACKET_SIZE:
402 if (packet_set_maxsize(packet_get_int()) > 0)
403 success = 1;
404 break;
405
406 case SSH_CMSG_EXEC_SHELL:
407 case SSH_CMSG_EXEC_CMD:
408 /* Set interactive/non-interactive mode. */
409 packet_set_interactive(have_pty || s->display != NULL,
410 options.keepalives);
411
412 if (type == SSH_CMSG_EXEC_CMD) {
413 command = packet_get_string(&dlen);
414 debug("Exec command '%.500s'", command);
415 packet_integrity_check(plen, 4 + dlen, type);
416 } else {
417 command = NULL;
418 packet_integrity_check(plen, 0, type);
419 }
420 if (forced_command != NULL) {
Damien Miller7b28dc52000-09-05 13:34:53 +1100421 original_command = command;
Damien Millerb38eff82000-04-01 11:09:21 +1000422 command = forced_command;
423 debug("Forced command '%.500s'", forced_command);
424 }
425 if (have_pty)
426 do_exec_pty(s, command, pw);
427 else
428 do_exec_no_pty(s, command, pw);
429
430 if (command != NULL)
431 xfree(command);
432 /* Cleanup user's local Xauthority file. */
433 if (xauthfile)
434 xauthfile_cleanup_proc(NULL);
435 return;
436
437 default:
438 /*
439 * Any unknown messages in this phase are ignored,
440 * and a failure message is returned.
441 */
442 log("Unknown packet type received after authentication: %d", type);
443 }
444 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
445 packet_send();
446 packet_write_wait();
447
448 /* Enable compression now that we have replied if appropriate. */
449 if (enable_compression_after_reply) {
450 enable_compression_after_reply = 0;
451 packet_start_compression(compression_level);
452 }
453 }
454}
455
456/*
457 * This is called to fork and execute a command when we have no tty. This
458 * will call do_child from the child, and server_loop from the parent after
459 * setting up file descriptors and such.
460 */
Damien Miller4af51302000-04-16 11:18:38 +1000461void
Damien Millerb38eff82000-04-01 11:09:21 +1000462do_exec_no_pty(Session *s, const char *command, struct passwd * pw)
463{
464 int pid;
465
466#ifdef USE_PIPES
467 int pin[2], pout[2], perr[2];
468 /* Allocate pipes for communicating with the program. */
469 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
470 packet_disconnect("Could not create pipes: %.100s",
471 strerror(errno));
472#else /* USE_PIPES */
473 int inout[2], err[2];
474 /* Uses socket pairs to communicate with the program. */
475 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
476 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
477 packet_disconnect("Could not create socket pairs: %.100s",
478 strerror(errno));
479#endif /* USE_PIPES */
480 if (s == NULL)
481 fatal("do_exec_no_pty: no session");
482
Damien Millere247cc42000-05-07 12:03:14 +1000483 session_proctitle(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000484
485#ifdef USE_PAM
486 do_pam_setcred();
487#endif /* USE_PAM */
488
489 /* Fork the child. */
490 if ((pid = fork()) == 0) {
491 /* Child. Reinitialize the log since the pid has changed. */
492 log_init(__progname, options.log_level, options.log_facility, log_stderr);
493
Damien Miller152cea22000-12-13 19:21:51 +1100494 signal(SIGPIPE, SIG_DFL);
495
Damien Millerb38eff82000-04-01 11:09:21 +1000496 /*
497 * Create a new session and process group since the 4.4BSD
498 * setlogin() affects the entire process group.
499 */
500 if (setsid() < 0)
501 error("setsid failed: %.100s", strerror(errno));
502
503#ifdef USE_PIPES
504 /*
505 * Redirect stdin. We close the parent side of the socket
506 * pair, and make the child side the standard input.
507 */
508 close(pin[1]);
509 if (dup2(pin[0], 0) < 0)
510 perror("dup2 stdin");
511 close(pin[0]);
512
513 /* Redirect stdout. */
514 close(pout[0]);
515 if (dup2(pout[1], 1) < 0)
516 perror("dup2 stdout");
517 close(pout[1]);
518
519 /* Redirect stderr. */
520 close(perr[0]);
521 if (dup2(perr[1], 2) < 0)
522 perror("dup2 stderr");
523 close(perr[1]);
524#else /* USE_PIPES */
525 /*
526 * Redirect stdin, stdout, and stderr. Stdin and stdout will
527 * use the same socket, as some programs (particularly rdist)
528 * seem to depend on it.
529 */
530 close(inout[1]);
531 close(err[1]);
532 if (dup2(inout[0], 0) < 0) /* stdin */
533 perror("dup2 stdin");
534 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
535 perror("dup2 stdout");
536 if (dup2(err[0], 2) < 0) /* stderr */
537 perror("dup2 stderr");
538#endif /* USE_PIPES */
539
540 /* Do processing for the child (exec command etc). */
541 do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL);
542 /* NOTREACHED */
543 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100544#ifdef HAVE_CYGWIN
545 if (is_winnt)
546 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
547#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000548 if (pid < 0)
549 packet_disconnect("fork failed: %.100s", strerror(errno));
550 s->pid = pid;
551#ifdef USE_PIPES
552 /* We are the parent. Close the child sides of the pipes. */
553 close(pin[0]);
554 close(pout[1]);
555 close(perr[1]);
556
Damien Millerefb4afe2000-04-12 18:45:05 +1000557 if (compat20) {
Damien Millerbd483e72000-04-30 10:00:53 +1000558 session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1);
Damien Millerefb4afe2000-04-12 18:45:05 +1000559 } else {
560 /* Enter the interactive session. */
561 server_loop(pid, pin[1], pout[0], perr[0]);
562 /* server_loop has closed pin[1], pout[1], and perr[1]. */
563 }
Damien Millerb38eff82000-04-01 11:09:21 +1000564#else /* USE_PIPES */
565 /* We are the parent. Close the child sides of the socket pairs. */
566 close(inout[0]);
567 close(err[0]);
568
569 /*
570 * Enter the interactive session. Note: server_loop must be able to
571 * handle the case that fdin and fdout are the same.
572 */
Damien Millerefb4afe2000-04-12 18:45:05 +1000573 if (compat20) {
Damien Millerbd483e72000-04-30 10:00:53 +1000574 session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1);
Damien Millerefb4afe2000-04-12 18:45:05 +1000575 } else {
576 server_loop(pid, inout[1], inout[1], err[1]);
577 /* server_loop has closed inout[1] and err[1]. */
578 }
Damien Millerb38eff82000-04-01 11:09:21 +1000579#endif /* USE_PIPES */
580}
581
582/*
583 * This is called to fork and execute a command when we have a tty. This
584 * will call do_child from the child, and server_loop from the parent after
585 * setting up file descriptors, controlling tty, updating wtmp, utmp,
586 * lastlog, and other such operations.
587 */
Damien Miller4af51302000-04-16 11:18:38 +1000588void
Damien Millerb38eff82000-04-01 11:09:21 +1000589do_exec_pty(Session *s, const char *command, struct passwd * pw)
590{
Damien Millerb38eff82000-04-01 11:09:21 +1000591 int fdout, ptyfd, ttyfd, ptymaster;
Damien Millerb38eff82000-04-01 11:09:21 +1000592 pid_t pid;
Damien Millerb38eff82000-04-01 11:09:21 +1000593
594 if (s == NULL)
595 fatal("do_exec_pty: no session");
596 ptyfd = s->ptyfd;
597 ttyfd = s->ttyfd;
598
Damien Millerb38eff82000-04-01 11:09:21 +1000599#ifdef USE_PAM
600 do_pam_session(pw->pw_name, s->tty);
601 do_pam_setcred();
602#endif /* USE_PAM */
603
604 /* Fork the child. */
605 if ((pid = fork()) == 0) {
Damien Miller942da032000-08-18 13:59:06 +1000606 /* Child. Reinitialize the log because the pid has changed. */
Damien Millerb38eff82000-04-01 11:09:21 +1000607 log_init(__progname, options.log_level, options.log_facility, log_stderr);
608
Damien Miller152cea22000-12-13 19:21:51 +1100609 signal(SIGPIPE, SIG_DFL);
610
Damien Millerb38eff82000-04-01 11:09:21 +1000611 /* Close the master side of the pseudo tty. */
612 close(ptyfd);
613
614 /* Make the pseudo tty our controlling tty. */
615 pty_make_controlling_tty(&ttyfd, s->tty);
616
617 /* Redirect stdin from the pseudo tty. */
618 if (dup2(ttyfd, fileno(stdin)) < 0)
619 error("dup2 stdin failed: %.100s", strerror(errno));
620
621 /* Redirect stdout to the pseudo tty. */
622 if (dup2(ttyfd, fileno(stdout)) < 0)
623 error("dup2 stdin failed: %.100s", strerror(errno));
624
625 /* Redirect stderr to the pseudo tty. */
626 if (dup2(ttyfd, fileno(stderr)) < 0)
627 error("dup2 stdin failed: %.100s", strerror(errno));
628
629 /* Close the extra descriptor for the pseudo tty. */
630 close(ttyfd);
631
Damien Miller942da032000-08-18 13:59:06 +1000632 /* record login, etc. similar to login(1) */
Damien Miller69b69aa2000-10-28 14:19:58 +1100633 if (!(options.use_login && command == NULL))
634 do_login(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000635
Damien Millerb38eff82000-04-01 11:09:21 +1000636 /* Do common processing for the child, such as execing the command. */
Damien Millerb1715dc2000-05-30 13:44:51 +1000637 do_child(command, pw, s->term, s->display, s->auth_proto,
638 s->auth_data, s->tty);
Damien Millerb38eff82000-04-01 11:09:21 +1000639 /* NOTREACHED */
640 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100641#ifdef HAVE_CYGWIN
642 if (is_winnt)
643 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
644#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000645 if (pid < 0)
646 packet_disconnect("fork failed: %.100s", strerror(errno));
647 s->pid = pid;
648
649 /* Parent. Close the slave side of the pseudo tty. */
650 close(ttyfd);
651
652 /*
653 * Create another descriptor of the pty master side for use as the
654 * standard input. We could use the original descriptor, but this
655 * simplifies code in server_loop. The descriptor is bidirectional.
656 */
657 fdout = dup(ptyfd);
658 if (fdout < 0)
659 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
660
661 /* we keep a reference to the pty master */
662 ptymaster = dup(ptyfd);
663 if (ptymaster < 0)
664 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
665 s->ptymaster = ptymaster;
666
667 /* Enter interactive session. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000668 if (compat20) {
669 session_set_fds(s, ptyfd, fdout, -1);
670 } else {
671 server_loop(pid, ptyfd, fdout, -1);
672 /* server_loop _has_ closed ptyfd and fdout. */
673 session_pty_cleanup(s);
674 }
Damien Millerb38eff82000-04-01 11:09:21 +1000675}
676
Damien Miller942da032000-08-18 13:59:06 +1000677const char *
678get_remote_name_or_ip(void)
679{
680 static const char *remote = "";
681 if (utmp_len > 0)
682 remote = get_canonical_hostname();
683 if (utmp_len == 0 || strlen(remote) > utmp_len)
684 remote = get_remote_ipaddr();
685 return remote;
686}
687
688/* administrative, login(1)-like work */
689void
Damien Miller69b69aa2000-10-28 14:19:58 +1100690do_login(Session *s, const char *command)
Damien Miller942da032000-08-18 13:59:06 +1000691{
692 FILE *f;
693 char *time_string;
694 char buf[256];
Damien Miller7b28dc52000-09-05 13:34:53 +1100695 char hostname[MAXHOSTNAMELEN];
Damien Miller942da032000-08-18 13:59:06 +1000696 socklen_t fromlen;
697 struct sockaddr_storage from;
698 struct stat st;
699 time_t last_login_time;
700 struct passwd * pw = s->pw;
701 pid_t pid = getpid();
702
703 /*
704 * Get IP address of client. If the connection is not a socket, let
705 * the address be 0.0.0.0.
706 */
707 memset(&from, 0, sizeof(from));
708 if (packet_connection_is_on_socket()) {
709 fromlen = sizeof(from);
710 if (getpeername(packet_get_connection_in(),
711 (struct sockaddr *) & from, &fromlen) < 0) {
712 debug("getpeername: %.100s", strerror(errno));
713 fatal_cleanup();
714 }
715 }
716
Damien Miller7b28dc52000-09-05 13:34:53 +1100717 /* Get the time and hostname when the user last logged in. */
Damien Millere4340be2000-09-16 13:29:08 +1100718 hostname[0] = '\0';
719 last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
720 hostname, sizeof(hostname));
721
Damien Miller942da032000-08-18 13:59:06 +1000722 /* Record that there was a login on that tty from the remote host. */
723 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
724 get_remote_name_or_ip(), (struct sockaddr *)&from);
725
Kevin Steves092f2ef2000-10-14 13:36:13 +0000726#ifdef USE_PAM
727 /*
728 * If password change is needed, do it now.
729 * This needs to occur before the ~/.hushlogin check.
730 */
731 if (pam_password_change_required()) {
732 print_pam_messages();
733 do_pam_chauthtok();
734 }
735#endif
736
Damien Miller69b69aa2000-10-28 14:19:58 +1100737 /* Done if .hushlogin exists or a command given. */
738 if (command != NULL)
739 return;
Damien Miller942da032000-08-18 13:59:06 +1000740 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
Damien Millerad833b32000-08-23 10:46:23 +1000741#ifdef HAVE_LOGIN_CAP
742 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
743#else
Damien Miller942da032000-08-18 13:59:06 +1000744 if (stat(buf, &st) >= 0)
Damien Millerad833b32000-08-23 10:46:23 +1000745#endif
Damien Miller942da032000-08-18 13:59:06 +1000746 return;
747
748#ifdef USE_PAM
Kevin Steves092f2ef2000-10-14 13:36:13 +0000749 if (!pam_password_change_required())
750 print_pam_messages();
Damien Miller942da032000-08-18 13:59:06 +1000751#endif /* USE_PAM */
752#ifdef WITH_AIXAUTHENTICATE
753 if (aixloginmsg && *aixloginmsg)
754 printf("%s\n", aixloginmsg);
755#endif /* WITH_AIXAUTHENTICATE */
756
Damien Miller942da032000-08-18 13:59:06 +1000757 if (last_login_time != 0) {
758 time_string = ctime(&last_login_time);
759 if (strchr(time_string, '\n'))
760 *strchr(time_string, '\n') = 0;
Kevin Stevesc368a3c2000-10-14 16:10:06 +0000761 if (strcmp(hostname, "") == 0)
Damien Miller942da032000-08-18 13:59:06 +1000762 printf("Last login: %s\r\n", time_string);
763 else
Damien Millere4340be2000-09-16 13:29:08 +1100764 printf("Last login: %s from %s\r\n", time_string, hostname);
Damien Miller942da032000-08-18 13:59:06 +1000765 }
766 if (options.print_motd) {
Damien Millerad833b32000-08-23 10:46:23 +1000767#ifdef HAVE_LOGIN_CAP
768 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
769 "/etc/motd"), "r");
770#else
Damien Miller942da032000-08-18 13:59:06 +1000771 f = fopen("/etc/motd", "r");
Damien Millerad833b32000-08-23 10:46:23 +1000772#endif
Damien Miller942da032000-08-18 13:59:06 +1000773 if (f) {
774 while (fgets(buf, sizeof(buf), f))
775 fputs(buf, stdout);
776 fclose(f);
777 }
778 }
779}
780
Damien Millerb38eff82000-04-01 11:09:21 +1000781/*
782 * Sets the value of the given variable in the environment. If the variable
783 * already exists, its value is overriden.
784 */
Damien Miller4af51302000-04-16 11:18:38 +1000785void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000786child_set_env(char ***envp, u_int *envsizep, const char *name,
Damien Millerb38eff82000-04-01 11:09:21 +1000787 const char *value)
788{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000789 u_int i, namelen;
Damien Millerb38eff82000-04-01 11:09:21 +1000790 char **env;
791
792 /*
793 * Find the slot where the value should be stored. If the variable
794 * already exists, we reuse the slot; otherwise we append a new slot
795 * at the end of the array, expanding if necessary.
796 */
797 env = *envp;
798 namelen = strlen(name);
799 for (i = 0; env[i]; i++)
800 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
801 break;
802 if (env[i]) {
803 /* Reuse the slot. */
804 xfree(env[i]);
805 } else {
806 /* New variable. Expand if necessary. */
807 if (i >= (*envsizep) - 1) {
808 (*envsizep) += 50;
809 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
810 }
811 /* Need to set the NULL pointer at end of array beyond the new slot. */
812 env[i + 1] = NULL;
813 }
814
815 /* Allocate space and format the variable in the appropriate slot. */
816 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
817 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
818}
819
820/*
821 * Reads environment variables from the given file and adds/overrides them
822 * into the environment. If the file does not exist, this does nothing.
823 * Otherwise, it must consist of empty lines, comments (line starts with '#')
824 * and assignments of the form name=value. No other forms are allowed.
825 */
Damien Miller4af51302000-04-16 11:18:38 +1000826void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000827read_environment_file(char ***env, u_int *envsize,
Damien Millerb38eff82000-04-01 11:09:21 +1000828 const char *filename)
829{
830 FILE *f;
831 char buf[4096];
832 char *cp, *value;
833
834 f = fopen(filename, "r");
835 if (!f)
836 return;
837
838 while (fgets(buf, sizeof(buf), f)) {
839 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
840 ;
841 if (!*cp || *cp == '#' || *cp == '\n')
842 continue;
843 if (strchr(cp, '\n'))
844 *strchr(cp, '\n') = '\0';
845 value = strchr(cp, '=');
846 if (value == NULL) {
847 fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
848 continue;
849 }
Damien Millerb1715dc2000-05-30 13:44:51 +1000850 /*
851 * Replace the equals sign by nul, and advance value to
852 * the value string.
853 */
Damien Millerb38eff82000-04-01 11:09:21 +1000854 *value = '\0';
855 value++;
856 child_set_env(env, envsize, cp, value);
857 }
858 fclose(f);
859}
860
861#ifdef USE_PAM
862/*
863 * Sets any environment variables which have been specified by PAM
864 */
865void do_pam_environment(char ***env, int *envsize)
866{
867 char *equals, var_name[512], var_val[512];
868 char **pam_env;
869 int i;
870
871 if ((pam_env = fetch_pam_environment()) == NULL)
872 return;
873
874 for(i = 0; pam_env[i] != NULL; i++) {
875 if ((equals = strstr(pam_env[i], "=")) == NULL)
876 continue;
877
878 if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) {
879 memset(var_name, '\0', sizeof(var_name));
880 memset(var_val, '\0', sizeof(var_val));
881
882 strncpy(var_name, pam_env[i], equals - pam_env[i]);
883 strcpy(var_val, equals + 1);
884
Damien Millercb5e44a2000-09-29 12:12:36 +1100885 debug3("PAM environment: %s=%s", var_name, var_val);
Damien Millerb38eff82000-04-01 11:09:21 +1000886
887 child_set_env(env, envsize, var_name, var_val);
888 }
889 }
890}
891#endif /* USE_PAM */
892
Damien Millercb5e44a2000-09-29 12:12:36 +1100893
894#ifdef HAVE_CYGWIN
895void copy_environment(char ***env, int *envsize)
896{
897 char *equals, var_name[512], var_val[512];
898 int i;
899
900 for(i = 0; environ[i] != NULL; i++) {
901 if ((equals = strstr(environ[i], "=")) == NULL)
902 continue;
903
904 if (strlen(environ[i]) < (sizeof(var_name) - 1)) {
905 memset(var_name, '\0', sizeof(var_name));
906 memset(var_val, '\0', sizeof(var_val));
907
908 strncpy(var_name, environ[i], equals - environ[i]);
909 strcpy(var_val, equals + 1);
910
911 debug3("Copy environment: %s=%s", var_name, var_val);
912
913 child_set_env(env, envsize, var_name, var_val);
914 }
915 }
916}
917#endif
918
Damien Miller5fc85652000-07-09 23:53:07 +1000919#if defined(HAVE_GETUSERATTR)
920/*
921 * AIX-specific login initialisation
922 */
923void set_limit(char *user, char *soft, char *hard, int resource, int mult)
924{
925 struct rlimit rlim;
Damien Miller65964d62000-07-11 09:16:22 +1000926 int slim, hlim;
Damien Miller5fc85652000-07-09 23:53:07 +1000927
928 getrlimit(resource, &rlim);
929
Damien Miller65964d62000-07-11 09:16:22 +1000930 slim = 0;
931 if (getuserattr(user, soft, &slim, SEC_INT) != -1) {
932 if (slim < 0) {
933 rlim.rlim_cur = RLIM_INFINITY;
934 } else if (slim != 0) {
935 /* See the wackiness below */
936 if (rlim.rlim_cur == slim * mult)
937 slim = 0;
938 else
939 rlim.rlim_cur = slim * mult;
940 }
941 }
Damien Miller5fc85652000-07-09 23:53:07 +1000942
Damien Miller65964d62000-07-11 09:16:22 +1000943 hlim = 0;
944 if (getuserattr(user, hard, &hlim, SEC_INT) != -1) {
945 if (hlim < 0) {
946 rlim.rlim_max = RLIM_INFINITY;
947 } else if (hlim != 0) {
948 rlim.rlim_max = hlim * mult;
949 }
950 }
Damien Miller5fc85652000-07-09 23:53:07 +1000951
Damien Miller65964d62000-07-11 09:16:22 +1000952 /*
953 * XXX For cpu and fsize the soft limit is set to the hard limit
954 * if the hard limit is left at its default value and the soft limit
955 * is changed from its default value, either by requesting it
956 * (slim == 0) or by setting it to the current default. At least
957 * that's how rlogind does it. If you're confused you're not alone.
958 * Bug or feature? AIX 4.3.1.2
959 */
960 if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu"))
961 && hlim == 0 && slim != 0)
962 rlim.rlim_max = rlim.rlim_cur;
963 /* A specified hard limit limits the soft limit */
964 else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max)
965 rlim.rlim_cur = rlim.rlim_max;
966 /* A soft limit can increase a hard limit */
967 else if (rlim.rlim_cur > rlim.rlim_max)
Damien Miller5fc85652000-07-09 23:53:07 +1000968 rlim.rlim_max = rlim.rlim_cur;
969
970 if (setrlimit(resource, &rlim) != 0)
Damien Miller65964d62000-07-11 09:16:22 +1000971 error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno));
Damien Miller5fc85652000-07-09 23:53:07 +1000972}
973
974void set_limits_from_userattr(char *user)
975{
976 int mask;
977 char buf[16];
978
979 set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512);
980 set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1);
981 set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512);
982 set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512);
983 set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512);
984 set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512);
985#if defined(S_UNOFILE)
986 set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1);
987#endif
988
989 if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) {
990 /* Convert decimal to octal */
991 (void) snprintf(buf, sizeof(buf), "%d", mask);
992 if (sscanf(buf, "%o", &mask) == 1)
993 umask(mask);
994 }
995}
996#endif /* defined(HAVE_GETUSERATTR) */
997
Damien Millerb38eff82000-04-01 11:09:21 +1000998/*
999 * Performs common processing for the child, such as setting up the
1000 * environment, closing extra file descriptors, setting the user and group
1001 * ids, and executing the command or shell.
1002 */
Damien Miller4af51302000-04-16 11:18:38 +10001003void
Damien Millerb38eff82000-04-01 11:09:21 +10001004do_child(const char *command, struct passwd * pw, const char *term,
1005 const char *display, const char *auth_proto,
1006 const char *auth_data, const char *ttyname)
1007{
Damien Miller7b28dc52000-09-05 13:34:53 +11001008 const char *shell, *hostname = NULL, *cp = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10001009 char buf[256];
Damien Miller0c043c12000-06-07 21:22:38 +10001010 char cmd[1024];
Damien Millerad833b32000-08-23 10:46:23 +10001011 FILE *f = NULL;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001012 u_int envsize, i;
Damien Millerb38eff82000-04-01 11:09:21 +10001013 char **env;
1014 extern char **environ;
1015 struct stat st;
1016 char *argv[10];
Damien Miller91606b12000-06-28 08:22:29 +10001017#ifdef WITH_IRIX_PROJECT
1018 prid_t projid;
1019#endif /* WITH_IRIX_PROJECT */
Ben Lindstrom980754c2000-11-12 00:04:24 +00001020#ifdef WITH_IRIX_JOBS
1021 jid_t jid = 0;
1022#else
1023#ifdef WITH_IRIX_ARRAY
1024 int jid = 0;
1025#endif /* WITH_IRIX_ARRAY */
1026#endif /* WITH_IRIX_JOBS */
1027
Damien Millerb38eff82000-04-01 11:09:21 +10001028
Damien Millerd3a18572000-06-07 19:55:44 +10001029 /* login(1) is only called if we execute the login shell */
1030 if (options.use_login && command != NULL)
1031 options.use_login = 0;
1032
Damien Millerb38eff82000-04-01 11:09:21 +10001033#ifndef USE_PAM /* pam_nologin handles this */
Damien Millerad833b32000-08-23 10:46:23 +10001034 if (!options.use_login) {
1035# ifdef HAVE_LOGIN_CAP
1036 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1037 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1038 _PATH_NOLOGIN), "r");
1039# else /* HAVE_LOGIN_CAP */
1040 if (pw->pw_uid)
1041 f = fopen(_PATH_NOLOGIN, "r");
1042# endif /* HAVE_LOGIN_CAP */
1043 if (f) {
1044 /* /etc/nologin exists. Print its contents and exit. */
1045 while (fgets(buf, sizeof(buf), f))
1046 fputs(buf, stderr);
1047 fclose(f);
Damien Millerb38eff82000-04-01 11:09:21 +10001048 exit(254);
Damien Millerad833b32000-08-23 10:46:23 +10001049 }
Damien Millerb38eff82000-04-01 11:09:21 +10001050 }
1051#endif /* USE_PAM */
1052
Damien Millerad833b32000-08-23 10:46:23 +10001053 /* Set login name, uid, gid, and groups. */
Damien Millerb38eff82000-04-01 11:09:21 +10001054 /* Login(1) does this as well, and it needs uid 0 for the "-h"
1055 switch, so we let login(1) to this for us. */
1056 if (!options.use_login) {
Damien Millerb8c656e2000-06-28 15:22:41 +10001057#ifdef HAVE_OSF_SIA
1058 extern char **saved_argv;
1059 extern int saved_argc;
1060 char *host = get_canonical_hostname ();
1061
1062 if (sia_become_user(NULL, saved_argc, saved_argv, host,
1063 pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) !=
1064 SIASUCCESS) {
1065 perror("sia_become_user");
1066 exit(1);
1067 }
1068 if (setreuid(geteuid(), geteuid()) < 0) {
1069 perror("setreuid");
1070 exit(1);
1071 }
1072#else /* HAVE_OSF_SIA */
Damien Millerbac2d8a2000-09-05 16:13:06 +11001073#ifdef HAVE_CYGWIN
1074 if (is_winnt) {
1075#else
Damien Millerb38eff82000-04-01 11:09:21 +10001076 if (getuid() == 0 || geteuid() == 0) {
Damien Millerbac2d8a2000-09-05 16:13:06 +11001077#endif
Damien Millerad833b32000-08-23 10:46:23 +10001078# ifdef HAVE_GETUSERATTR
Damien Miller5fc85652000-07-09 23:53:07 +10001079 set_limits_from_userattr(pw->pw_name);
Damien Millerad833b32000-08-23 10:46:23 +10001080# endif /* HAVE_GETUSERATTR */
1081# ifdef HAVE_LOGIN_CAP
1082 if (setusercontext(lc, pw, pw->pw_uid,
1083 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1084 perror("unable to set user context");
1085 exit(1);
1086 }
1087# else /* HAVE_LOGIN_CAP */
1088 if (setlogin(pw->pw_name) < 0)
1089 error("setlogin failed: %s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10001090 if (setgid(pw->pw_gid) < 0) {
1091 perror("setgid");
1092 exit(1);
1093 }
1094 /* Initialize the group list. */
1095 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1096 perror("initgroups");
1097 exit(1);
1098 }
1099 endgrent();
Ben Lindstrom980754c2000-11-12 00:04:24 +00001100# ifdef WITH_IRIX_JOBS
1101 jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive");
1102 if (jid == -1) {
1103 fatal("Failed to create job container: %.100s",
1104 strerror(errno));
1105 }
1106# endif /* WITH_IRIX_JOBS */
Damien Millerad833b32000-08-23 10:46:23 +10001107# ifdef WITH_IRIX_ARRAY
Damien Miller91606b12000-06-28 08:22:29 +10001108 /* initialize array session */
Ben Lindstrom980754c2000-11-12 00:04:24 +00001109 if (jid == 0) {
1110 if (newarraysess() != 0)
1111 fatal("Failed to set up new array session: %.100s",
1112 strerror(errno));
1113 }
Damien Millerad833b32000-08-23 10:46:23 +10001114# endif /* WITH_IRIX_ARRAY */
1115# ifdef WITH_IRIX_PROJECT
Damien Miller91606b12000-06-28 08:22:29 +10001116 /* initialize irix project info */
1117 if ((projid = getdfltprojuser(pw->pw_name)) == -1) {
1118 debug("Failed to get project id, using projid 0");
1119 projid = 0;
1120 }
Damien Miller91606b12000-06-28 08:22:29 +10001121 if (setprid(projid))
1122 fatal("Failed to initialize project %d for %s: %.100s",
1123 (int)projid, pw->pw_name, strerror(errno));
Damien Millerad833b32000-08-23 10:46:23 +10001124# endif /* WITH_IRIX_PROJECT */
Ben Lindstrom49a79c02000-11-17 03:47:20 +00001125#ifdef WITH_IRIX_AUDIT
1126 if (sysconf(_SC_AUDIT)) {
1127 debug("Setting sat id to %d", (int) pw->pw_uid);
1128 if (satsetid(pw->pw_uid))
1129 debug("error setting satid: %.100s", strerror(errno));
1130 }
1131#endif /* WITH_IRIX_AUDIT */
1132
Damien Millerb38eff82000-04-01 11:09:21 +10001133 /* Permanently switch to the desired uid. */
1134 permanently_set_uid(pw->pw_uid);
Damien Millerad833b32000-08-23 10:46:23 +10001135# endif /* HAVE_LOGIN_CAP */
Damien Millerb38eff82000-04-01 11:09:21 +10001136 }
Damien Millerad833b32000-08-23 10:46:23 +10001137#endif /* HAVE_OSF_SIA */
1138
Damien Millerbac2d8a2000-09-05 16:13:06 +11001139#ifdef HAVE_CYGWIN
1140 if (is_winnt)
1141#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001142 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
Damien Millercaf6dd62000-08-29 11:33:50 +11001143 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
Damien Millerb38eff82000-04-01 11:09:21 +10001144 }
1145 /*
1146 * Get the shell from the password data. An empty shell field is
1147 * legal, and means /bin/sh.
1148 */
1149 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
Damien Millerad833b32000-08-23 10:46:23 +10001150#ifdef HAVE_LOGIN_CAP
1151 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1152#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001153
1154#ifdef AFS
1155 /* Try to get AFS tokens for the local cell. */
1156 if (k_hasafs()) {
1157 char cell[64];
1158
1159 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1160 krb_afslog(cell, 0);
1161
1162 krb_afslog(0, 0);
1163 }
1164#endif /* AFS */
1165
1166 /* Initialize the environment. */
1167 envsize = 100;
1168 env = xmalloc(envsize * sizeof(char *));
1169 env[0] = NULL;
1170
Damien Millerbac2d8a2000-09-05 16:13:06 +11001171#ifdef HAVE_CYGWIN
1172 /*
1173 * The Windows environment contains some setting which are
1174 * important for a running system. They must not be dropped.
1175 */
Damien Millercb5e44a2000-09-29 12:12:36 +11001176 copy_environment(&env, &envsize);
Damien Millerbac2d8a2000-09-05 16:13:06 +11001177#endif
1178
Damien Millerb38eff82000-04-01 11:09:21 +10001179 if (!options.use_login) {
1180 /* Set basic environment. */
1181 child_set_env(&env, &envsize, "USER", pw->pw_name);
1182 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
1183 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
Damien Millerad833b32000-08-23 10:46:23 +10001184#ifdef HAVE_LOGIN_CAP
1185 (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
1186 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
Damien Millercb5e44a2000-09-29 12:12:36 +11001187#else /* HAVE_LOGIN_CAP */
1188# ifndef HAVE_CYGWIN
Damien Millerbac2d8a2000-09-05 16:13:06 +11001189 /*
1190 * There's no standard path on Windows. The path contains
1191 * important components pointing to the system directories,
1192 * needed for loading shared libraries. So the path better
1193 * remains intact here.
1194 */
Damien Millerb38eff82000-04-01 11:09:21 +10001195 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
Damien Millercb5e44a2000-09-29 12:12:36 +11001196# endif /* HAVE_CYGWIN */
1197#endif /* HAVE_LOGIN_CAP */
Damien Millerb38eff82000-04-01 11:09:21 +10001198
1199 snprintf(buf, sizeof buf, "%.200s/%.50s",
1200 _PATH_MAILDIR, pw->pw_name);
1201 child_set_env(&env, &envsize, "MAIL", buf);
1202
1203 /* Normal systems set SHELL by default. */
1204 child_set_env(&env, &envsize, "SHELL", shell);
1205 }
1206 if (getenv("TZ"))
1207 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1208
1209 /* Set custom environment options from RSA authentication. */
1210 while (custom_environment) {
1211 struct envstring *ce = custom_environment;
1212 char *s = ce->s;
1213 int i;
1214 for (i = 0; s[i] != '=' && s[i]; i++);
1215 if (s[i] == '=') {
1216 s[i] = 0;
1217 child_set_env(&env, &envsize, s, s + i + 1);
1218 }
1219 custom_environment = ce->next;
1220 xfree(ce->s);
1221 xfree(ce);
1222 }
1223
1224 snprintf(buf, sizeof buf, "%.50s %d %d",
1225 get_remote_ipaddr(), get_remote_port(), get_local_port());
1226 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1227
1228 if (ttyname)
1229 child_set_env(&env, &envsize, "SSH_TTY", ttyname);
1230 if (term)
1231 child_set_env(&env, &envsize, "TERM", term);
1232 if (display)
1233 child_set_env(&env, &envsize, "DISPLAY", display);
Damien Miller7b28dc52000-09-05 13:34:53 +11001234 if (original_command)
1235 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1236 original_command);
Damien Millerb38eff82000-04-01 11:09:21 +10001237
1238#ifdef _AIX
Damien Millercb5e44a2000-09-29 12:12:36 +11001239 if ((cp = getenv("AUTHSTATE")) != NULL)
1240 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1241 if ((cp = getenv("KRB5CCNAME")) != NULL)
1242 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1243 read_environment_file(&env, &envsize, "/etc/environment");
Damien Millerb38eff82000-04-01 11:09:21 +10001244#endif
1245
1246#ifdef KRB4
1247 {
1248 extern char *ticket;
1249
1250 if (ticket)
1251 child_set_env(&env, &envsize, "KRBTKFILE", ticket);
1252 }
1253#endif /* KRB4 */
1254
1255#ifdef USE_PAM
1256 /* Pull in any environment variables that may have been set by PAM. */
1257 do_pam_environment(&env, &envsize);
1258#endif /* USE_PAM */
1259
Damien Millerb38eff82000-04-01 11:09:21 +10001260 if (xauthfile)
1261 child_set_env(&env, &envsize, "XAUTHORITY", xauthfile);
1262 if (auth_get_socket_name() != NULL)
1263 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1264 auth_get_socket_name());
1265
1266 /* read $HOME/.ssh/environment. */
1267 if (!options.use_login) {
Damien Millerb1715dc2000-05-30 13:44:51 +10001268 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1269 pw->pw_dir);
Damien Millerb38eff82000-04-01 11:09:21 +10001270 read_environment_file(&env, &envsize, buf);
1271 }
1272 if (debug_flag) {
1273 /* dump the environment */
1274 fprintf(stderr, "Environment:\n");
1275 for (i = 0; env[i]; i++)
1276 fprintf(stderr, " %.200s\n", env[i]);
1277 }
Damien Millerad833b32000-08-23 10:46:23 +10001278 /* we have to stash the hostname before we close our socket. */
1279 if (options.use_login)
1280 hostname = get_remote_name_or_ip();
Damien Millerb38eff82000-04-01 11:09:21 +10001281 /*
1282 * Close the connection descriptors; note that this is the child, and
1283 * the server will still have the socket open, and it is important
1284 * that we do not shutdown it. Note that the descriptors cannot be
1285 * closed before building the environment, as we call
1286 * get_remote_ipaddr there.
1287 */
1288 if (packet_get_connection_in() == packet_get_connection_out())
1289 close(packet_get_connection_in());
1290 else {
1291 close(packet_get_connection_in());
1292 close(packet_get_connection_out());
1293 }
1294 /*
1295 * Close all descriptors related to channels. They will still remain
1296 * open in the parent.
1297 */
1298 /* XXX better use close-on-exec? -markus */
1299 channel_close_all();
1300
1301 /*
1302 * Close any extra file descriptors. Note that there may still be
1303 * descriptors left by system functions. They will be closed later.
1304 */
1305 endpwent();
1306
1307 /*
1308 * Close any extra open file descriptors so that we don\'t have them
1309 * hanging around in clients. Note that we want to do this after
1310 * initgroups, because at least on Solaris 2.3 it leaves file
1311 * descriptors open.
1312 */
1313 for (i = 3; i < 64; i++)
1314 close(i);
1315
1316 /* Change current directory to the user\'s home directory. */
Damien Millerad833b32000-08-23 10:46:23 +10001317 if (chdir(pw->pw_dir) < 0) {
Damien Millerb38eff82000-04-01 11:09:21 +10001318 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1319 pw->pw_dir, strerror(errno));
Damien Millerad833b32000-08-23 10:46:23 +10001320#ifdef HAVE_LOGIN_CAP
1321 if (login_getcapbool(lc, "requirehome", 0))
1322 exit(1);
1323#endif
1324 }
Damien Millerb38eff82000-04-01 11:09:21 +10001325
1326 /*
1327 * Must take new environment into use so that .ssh/rc, /etc/sshrc and
1328 * xauth are run in the proper environment.
1329 */
1330 environ = env;
1331
1332 /*
1333 * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first
1334 * in this order).
1335 */
1336 if (!options.use_login) {
1337 if (stat(SSH_USER_RC, &st) >= 0) {
1338 if (debug_flag)
Ben Lindstromd26dcf32001-01-06 15:18:16 +00001339 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, SSH_USER_RC);
Damien Millerb38eff82000-04-01 11:09:21 +10001340
Damien Miller7b413d22000-07-01 13:24:21 +10001341 f = popen(_PATH_BSHELL " " SSH_USER_RC, "w");
Damien Millerb38eff82000-04-01 11:09:21 +10001342 if (f) {
1343 if (auth_proto != NULL && auth_data != NULL)
1344 fprintf(f, "%s %s\n", auth_proto, auth_data);
1345 pclose(f);
1346 } else
1347 fprintf(stderr, "Could not run %s\n", SSH_USER_RC);
1348 } else if (stat(SSH_SYSTEM_RC, &st) >= 0) {
1349 if (debug_flag)
Ben Lindstromd26dcf32001-01-06 15:18:16 +00001350 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, SSH_SYSTEM_RC);
Damien Millerb38eff82000-04-01 11:09:21 +10001351
Damien Miller7b413d22000-07-01 13:24:21 +10001352 f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w");
Damien Millerb38eff82000-04-01 11:09:21 +10001353 if (f) {
1354 if (auth_proto != NULL && auth_data != NULL)
1355 fprintf(f, "%s %s\n", auth_proto, auth_data);
1356 pclose(f);
1357 } else
1358 fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC);
Damien Miller0c043c12000-06-07 21:22:38 +10001359 } else if (options.xauth_location != NULL) {
Damien Millerb38eff82000-04-01 11:09:21 +10001360 /* Add authority data to .Xauthority if appropriate. */
1361 if (auth_proto != NULL && auth_data != NULL) {
Damien Millerd999ae22000-05-20 12:49:31 +10001362 char *screen = strchr(display, ':');
1363 if (debug_flag) {
Damien Millerb1715dc2000-05-30 13:44:51 +10001364 fprintf(stderr,
1365 "Running %.100s add %.100s %.100s %.100s\n",
Damien Miller0c043c12000-06-07 21:22:38 +10001366 options.xauth_location, display,
1367 auth_proto, auth_data);
Damien Miller05dd7952000-10-01 00:42:48 +11001368#ifndef HAVE_CYGWIN /* Unix sockets are not supported */
Damien Millerd999ae22000-05-20 12:49:31 +10001369 if (screen != NULL)
Damien Millerb1715dc2000-05-30 13:44:51 +10001370 fprintf(stderr,
1371 "Adding %.*s/unix%s %s %s\n",
Damien Millercaf6dd62000-08-29 11:33:50 +11001372 (int)(screen-display), display,
Damien Millerb1715dc2000-05-30 13:44:51 +10001373 screen, auth_proto, auth_data);
Damien Miller05dd7952000-10-01 00:42:48 +11001374#endif
Damien Millerd999ae22000-05-20 12:49:31 +10001375 }
Damien Miller0c043c12000-06-07 21:22:38 +10001376 snprintf(cmd, sizeof cmd, "%s -q -",
1377 options.xauth_location);
1378 f = popen(cmd, "w");
Damien Millerb38eff82000-04-01 11:09:21 +10001379 if (f) {
Damien Millerb1715dc2000-05-30 13:44:51 +10001380 fprintf(f, "add %s %s %s\n", display,
1381 auth_proto, auth_data);
Damien Miller05dd7952000-10-01 00:42:48 +11001382#ifndef HAVE_CYGWIN /* Unix sockets are not supported */
Damien Millerd999ae22000-05-20 12:49:31 +10001383 if (screen != NULL)
1384 fprintf(f, "add %.*s/unix%s %s %s\n",
Damien Millercaf6dd62000-08-29 11:33:50 +11001385 (int)(screen-display), display,
Damien Millerb1715dc2000-05-30 13:44:51 +10001386 screen, auth_proto, auth_data);
Damien Miller05dd7952000-10-01 00:42:48 +11001387#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001388 pclose(f);
Damien Miller0c043c12000-06-07 21:22:38 +10001389 } else {
1390 fprintf(stderr, "Could not run %s\n",
1391 cmd);
1392 }
Damien Millerb38eff82000-04-01 11:09:21 +10001393 }
1394 }
Damien Millerb38eff82000-04-01 11:09:21 +10001395 /* Get the last component of the shell name. */
1396 cp = strrchr(shell, '/');
1397 if (cp)
1398 cp++;
1399 else
1400 cp = shell;
1401 }
1402 /*
1403 * If we have no command, execute the shell. In this case, the shell
1404 * name to be passed in argv[0] is preceded by '-' to indicate that
1405 * this is a login shell.
1406 */
1407 if (!command) {
1408 if (!options.use_login) {
1409 char buf[256];
1410
1411 /*
1412 * Check for mail if we have a tty and it was enabled
1413 * in server options.
1414 */
1415 if (ttyname && options.check_mail) {
1416 char *mailbox;
1417 struct stat mailstat;
1418 mailbox = getenv("MAIL");
1419 if (mailbox != NULL) {
Damien Millerb1715dc2000-05-30 13:44:51 +10001420 if (stat(mailbox, &mailstat) != 0 ||
1421 mailstat.st_size == 0)
Damien Millerb38eff82000-04-01 11:09:21 +10001422 printf("No mail.\n");
1423 else if (mailstat.st_mtime < mailstat.st_atime)
1424 printf("You have mail.\n");
1425 else
1426 printf("You have new mail.\n");
1427 }
1428 }
1429 /* Start the shell. Set initial character to '-'. */
1430 buf[0] = '-';
1431 strncpy(buf + 1, cp, sizeof(buf) - 1);
1432 buf[sizeof(buf) - 1] = 0;
1433
1434 /* Execute the shell. */
1435 argv[0] = buf;
1436 argv[1] = NULL;
1437 execve(shell, argv, env);
1438
1439 /* Executing the shell failed. */
1440 perror(shell);
1441 exit(1);
1442
1443 } else {
1444 /* Launch login(1). */
1445
Damien Millerad833b32000-08-23 10:46:23 +10001446 execl(LOGIN_PROGRAM, "login", "-h", hostname,
Damien Miller942da032000-08-18 13:59:06 +10001447 "-p", "-f", "--", pw->pw_name, NULL);
Damien Millerb38eff82000-04-01 11:09:21 +10001448
1449 /* Login couldn't be executed, die. */
1450
1451 perror("login");
1452 exit(1);
1453 }
1454 }
1455 /*
1456 * Execute the command using the user's shell. This uses the -c
1457 * option to execute the command.
1458 */
1459 argv[0] = (char *) cp;
1460 argv[1] = "-c";
1461 argv[2] = (char *) command;
1462 argv[3] = NULL;
1463 execve(shell, argv, env);
1464 perror(shell);
1465 exit(1);
1466}
1467
1468Session *
1469session_new(void)
1470{
1471 int i;
1472 static int did_init = 0;
1473 if (!did_init) {
1474 debug("session_new: init");
1475 for(i = 0; i < MAX_SESSIONS; i++) {
1476 sessions[i].used = 0;
1477 sessions[i].self = i;
1478 }
1479 did_init = 1;
1480 }
1481 for(i = 0; i < MAX_SESSIONS; i++) {
1482 Session *s = &sessions[i];
1483 if (! s->used) {
1484 s->pid = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10001485 s->extended = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001486 s->chanid = -1;
1487 s->ptyfd = -1;
1488 s->ttyfd = -1;
1489 s->term = NULL;
1490 s->pw = NULL;
1491 s->display = NULL;
1492 s->screen = 0;
1493 s->auth_data = NULL;
1494 s->auth_proto = NULL;
1495 s->used = 1;
Damien Millerbd483e72000-04-30 10:00:53 +10001496 s->pw = NULL;
Damien Miller15b29522000-10-14 12:33:48 +11001497 debug("session_new: session %d", i);
Damien Millerb38eff82000-04-01 11:09:21 +10001498 return s;
1499 }
1500 }
1501 return NULL;
1502}
1503
1504void
1505session_dump(void)
1506{
1507 int i;
1508 for(i = 0; i < MAX_SESSIONS; i++) {
1509 Session *s = &sessions[i];
1510 debug("dump: used %d session %d %p channel %d pid %d",
1511 s->used,
1512 s->self,
1513 s,
1514 s->chanid,
1515 s->pid);
1516 }
1517}
1518
Damien Millerefb4afe2000-04-12 18:45:05 +10001519int
1520session_open(int chanid)
1521{
1522 Session *s = session_new();
1523 debug("session_open: channel %d", chanid);
1524 if (s == NULL) {
1525 error("no more sessions");
1526 return 0;
1527 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001528 s->pw = auth_get_user();
1529 if (s->pw == NULL)
Damien Millerbd483e72000-04-30 10:00:53 +10001530 fatal("no user for session %i", s->self);
1531 debug("session_open: session %d: link with channel %d", s->self, chanid);
1532 s->chanid = chanid;
Damien Millerefb4afe2000-04-12 18:45:05 +10001533 return 1;
1534}
1535
1536Session *
1537session_by_channel(int id)
1538{
1539 int i;
1540 for(i = 0; i < MAX_SESSIONS; i++) {
1541 Session *s = &sessions[i];
1542 if (s->used && s->chanid == id) {
1543 debug("session_by_channel: session %d channel %d", i, id);
1544 return s;
1545 }
1546 }
1547 debug("session_by_channel: unknown channel %d", id);
1548 session_dump();
1549 return NULL;
1550}
1551
1552Session *
1553session_by_pid(pid_t pid)
1554{
1555 int i;
1556 debug("session_by_pid: pid %d", pid);
1557 for(i = 0; i < MAX_SESSIONS; i++) {
1558 Session *s = &sessions[i];
1559 if (s->used && s->pid == pid)
1560 return s;
1561 }
1562 error("session_by_pid: unknown pid %d", pid);
1563 session_dump();
1564 return NULL;
1565}
1566
1567int
1568session_window_change_req(Session *s)
1569{
1570 s->col = packet_get_int();
1571 s->row = packet_get_int();
1572 s->xpixel = packet_get_int();
1573 s->ypixel = packet_get_int();
Damien Miller4af51302000-04-16 11:18:38 +10001574 packet_done();
Damien Millerefb4afe2000-04-12 18:45:05 +10001575 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1576 return 1;
1577}
1578
1579int
1580session_pty_req(Session *s)
1581{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001582 u_int len;
Damien Miller4af51302000-04-16 11:18:38 +10001583 char *term_modes; /* encoded terminal modes */
Damien Millerefb4afe2000-04-12 18:45:05 +10001584
Damien Millerf6d9e222000-06-18 14:50:44 +10001585 if (no_pty_flag)
1586 return 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001587 if (s->ttyfd != -1)
Damien Miller4af51302000-04-16 11:18:38 +10001588 return 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001589 s->term = packet_get_string(&len);
1590 s->col = packet_get_int();
1591 s->row = packet_get_int();
1592 s->xpixel = packet_get_int();
1593 s->ypixel = packet_get_int();
Damien Miller4af51302000-04-16 11:18:38 +10001594 term_modes = packet_get_string(&len);
1595 packet_done();
Damien Millerefb4afe2000-04-12 18:45:05 +10001596
1597 if (strcmp(s->term, "") == 0) {
1598 xfree(s->term);
1599 s->term = NULL;
1600 }
1601 /* Allocate a pty and open it. */
1602 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
1603 xfree(s->term);
1604 s->term = NULL;
1605 s->ptyfd = -1;
1606 s->ttyfd = -1;
1607 error("session_pty_req: session %d alloc failed", s->self);
Damien Miller4af51302000-04-16 11:18:38 +10001608 xfree(term_modes);
1609 return 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001610 }
1611 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1612 /*
1613 * Add a cleanup function to clear the utmp entry and record logout
1614 * time in case we call fatal() (e.g., the connection gets closed).
1615 */
1616 fatal_add_cleanup(pty_cleanup_proc, (void *)s);
1617 pty_setowner(s->pw, s->tty);
1618 /* Get window size from the packet. */
1619 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1620
Damien Millere247cc42000-05-07 12:03:14 +10001621 session_proctitle(s);
1622
Damien Miller5f056372000-04-16 12:31:48 +10001623 /* XXX parse and set terminal modes */
1624 xfree(term_modes);
Damien Millerefb4afe2000-04-12 18:45:05 +10001625 return 1;
1626}
1627
Damien Millerbd483e72000-04-30 10:00:53 +10001628int
1629session_subsystem_req(Session *s)
1630{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001631 u_int len;
Damien Millerbd483e72000-04-30 10:00:53 +10001632 int success = 0;
1633 char *subsys = packet_get_string(&len);
Damien Millerf6d9e222000-06-18 14:50:44 +10001634 int i;
Damien Millerbd483e72000-04-30 10:00:53 +10001635
1636 packet_done();
1637 log("subsystem request for %s", subsys);
1638
Damien Millerf6d9e222000-06-18 14:50:44 +10001639 for (i = 0; i < options.num_subsystems; i++) {
1640 if(strcmp(subsys, options.subsystem_name[i]) == 0) {
1641 debug("subsystem: exec() %s", options.subsystem_command[i]);
1642 do_exec_no_pty(s, options.subsystem_command[i], s->pw);
1643 success = 1;
1644 }
1645 }
1646
1647 if (!success)
1648 log("subsystem request for %s failed, subsystem not found", subsys);
1649
Damien Millerbd483e72000-04-30 10:00:53 +10001650 xfree(subsys);
1651 return success;
1652}
1653
1654int
1655session_x11_req(Session *s)
1656{
Damien Miller7b28dc52000-09-05 13:34:53 +11001657 int fd;
Damien Miller37023962000-07-11 17:31:38 +10001658 if (no_x11_forwarding_flag) {
Damien Millerf6d9e222000-06-18 14:50:44 +10001659 debug("X11 forwarding disabled in user configuration file.");
1660 return 0;
1661 }
Damien Millerbd483e72000-04-30 10:00:53 +10001662 if (!options.x11_forwarding) {
1663 debug("X11 forwarding disabled in server configuration file.");
1664 return 0;
1665 }
1666 if (xauthfile != NULL) {
1667 debug("X11 fwd already started.");
1668 return 0;
1669 }
1670
1671 debug("Received request for X11 forwarding with auth spoofing.");
1672 if (s->display != NULL)
1673 packet_disconnect("Protocol error: X11 display already set.");
1674
1675 s->single_connection = packet_get_char();
1676 s->auth_proto = packet_get_string(NULL);
1677 s->auth_data = packet_get_string(NULL);
1678 s->screen = packet_get_int();
1679 packet_done();
1680
1681 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
1682 if (s->display == NULL) {
1683 xfree(s->auth_proto);
1684 xfree(s->auth_data);
1685 return 0;
1686 }
1687 xauthfile = xmalloc(MAXPATHLEN);
1688 strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
1689 temporarily_use_uid(s->pw->pw_uid);
1690 if (mkdtemp(xauthfile) == NULL) {
1691 restore_uid();
1692 error("private X11 dir: mkdtemp %s failed: %s",
1693 xauthfile, strerror(errno));
1694 xfree(xauthfile);
1695 xauthfile = NULL;
1696 xfree(s->auth_proto);
1697 xfree(s->auth_data);
1698 /* XXXX remove listening channels */
1699 return 0;
1700 }
1701 strlcat(xauthfile, "/cookies", MAXPATHLEN);
Damien Miller7b28dc52000-09-05 13:34:53 +11001702 fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
1703 if (fd >= 0)
1704 close(fd);
Damien Millerbd483e72000-04-30 10:00:53 +10001705 restore_uid();
1706 fatal_add_cleanup(xauthfile_cleanup_proc, s);
1707 return 1;
1708}
1709
Damien Millerf6d9e222000-06-18 14:50:44 +10001710int
1711session_shell_req(Session *s)
1712{
1713 /* if forced_command == NULL, the shell is execed */
1714 char *shell = forced_command;
1715 packet_done();
1716 s->extended = 1;
1717 if (s->ttyfd == -1)
1718 do_exec_no_pty(s, shell, s->pw);
1719 else
1720 do_exec_pty(s, shell, s->pw);
1721 return 1;
1722}
1723
1724int
1725session_exec_req(Session *s)
1726{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001727 u_int len;
Damien Millerf6d9e222000-06-18 14:50:44 +10001728 char *command = packet_get_string(&len);
1729 packet_done();
1730 if (forced_command) {
Damien Miller7b28dc52000-09-05 13:34:53 +11001731 original_command = command;
Damien Millerf6d9e222000-06-18 14:50:44 +10001732 command = forced_command;
1733 debug("Forced command '%.500s'", forced_command);
1734 }
1735 s->extended = 1;
1736 if (s->ttyfd == -1)
1737 do_exec_no_pty(s, command, s->pw);
1738 else
1739 do_exec_pty(s, command, s->pw);
1740 if (forced_command == NULL)
1741 xfree(command);
1742 return 1;
1743}
1744
Damien Miller0bc1bd82000-11-13 22:57:25 +11001745int
1746session_auth_agent_req(Session *s)
1747{
1748 static int called = 0;
1749 packet_done();
Ben Lindstrom14920292000-11-21 21:24:55 +00001750 if (no_agent_forwarding_flag) {
1751 debug("session_auth_agent_req: no_agent_forwarding_flag");
1752 return 0;
1753 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001754 if (called) {
1755 return 0;
1756 } else {
1757 called = 1;
1758 return auth_input_request_forwarding(s->pw);
1759 }
1760}
1761
Damien Millerefb4afe2000-04-12 18:45:05 +10001762void
1763session_input_channel_req(int id, void *arg)
1764{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001765 u_int len;
Damien Millerefb4afe2000-04-12 18:45:05 +10001766 int reply;
1767 int success = 0;
1768 char *rtype;
1769 Session *s;
1770 Channel *c;
1771
1772 rtype = packet_get_string(&len);
1773 reply = packet_get_char();
1774
1775 s = session_by_channel(id);
1776 if (s == NULL)
1777 fatal("session_input_channel_req: channel %d: no session", id);
1778 c = channel_lookup(id);
1779 if (c == NULL)
1780 fatal("session_input_channel_req: channel %d: bad channel", id);
1781
1782 debug("session_input_channel_req: session %d channel %d request %s reply %d",
1783 s->self, id, rtype, reply);
1784
1785 /*
1786 * a session is in LARVAL state until a shell
1787 * or programm is executed
1788 */
1789 if (c->type == SSH_CHANNEL_LARVAL) {
1790 if (strcmp(rtype, "shell") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10001791 success = session_shell_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001792 } else if (strcmp(rtype, "exec") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10001793 success = session_exec_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001794 } else if (strcmp(rtype, "pty-req") == 0) {
Damien Miller5f056372000-04-16 12:31:48 +10001795 success = session_pty_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10001796 } else if (strcmp(rtype, "x11-req") == 0) {
1797 success = session_x11_req(s);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001798 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1799 success = session_auth_agent_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10001800 } else if (strcmp(rtype, "subsystem") == 0) {
1801 success = session_subsystem_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001802 }
1803 }
1804 if (strcmp(rtype, "window-change") == 0) {
1805 success = session_window_change_req(s);
1806 }
1807
1808 if (reply) {
1809 packet_start(success ?
1810 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1811 packet_put_int(c->remote_id);
1812 packet_send();
1813 }
1814 xfree(rtype);
1815}
1816
1817void
1818session_set_fds(Session *s, int fdin, int fdout, int fderr)
1819{
1820 if (!compat20)
1821 fatal("session_set_fds: called for proto != 2.0");
1822 /*
1823 * now that have a child and a pipe to the child,
1824 * we can activate our channel and register the fd's
1825 */
1826 if (s->chanid == -1)
1827 fatal("no channel for session %d", s->self);
1828 channel_set_fds(s->chanid,
1829 fdout, fdin, fderr,
Damien Miller69b69aa2000-10-28 14:19:58 +11001830 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1831 1);
Damien Millerefb4afe2000-04-12 18:45:05 +10001832}
1833
Damien Millerb38eff82000-04-01 11:09:21 +10001834void
1835session_pty_cleanup(Session *s)
1836{
1837 if (s == NULL || s->ttyfd == -1)
1838 return;
1839
1840 debug("session_pty_cleanup: session %i release %s", s->self, s->tty);
1841
1842 /* Cancel the cleanup function. */
1843 fatal_remove_cleanup(pty_cleanup_proc, (void *)s);
1844
1845 /* Record that the user has logged out. */
1846 record_logout(s->pid, s->tty);
1847
1848 /* Release the pseudo-tty. */
1849 pty_release(s->tty);
1850
1851 /*
1852 * Close the server side of the socket pairs. We must do this after
1853 * the pty cleanup, so that another process doesn't get this pty
1854 * while we're still cleaning up.
1855 */
1856 if (close(s->ptymaster) < 0)
1857 error("close(s->ptymaster): %s", strerror(errno));
1858}
Damien Millerefb4afe2000-04-12 18:45:05 +10001859
1860void
1861session_exit_message(Session *s, int status)
1862{
1863 Channel *c;
1864 if (s == NULL)
1865 fatal("session_close: no session");
1866 c = channel_lookup(s->chanid);
1867 if (c == NULL)
1868 fatal("session_close: session %d: no channel %d",
1869 s->self, s->chanid);
1870 debug("session_exit_message: session %d channel %d pid %d",
1871 s->self, s->chanid, s->pid);
1872
1873 if (WIFEXITED(status)) {
1874 channel_request_start(s->chanid,
1875 "exit-status", 0);
1876 packet_put_int(WEXITSTATUS(status));
1877 packet_send();
1878 } else if (WIFSIGNALED(status)) {
1879 channel_request_start(s->chanid,
1880 "exit-signal", 0);
1881 packet_put_int(WTERMSIG(status));
Damien Millerf3c6cf12000-05-17 22:08:29 +10001882#ifdef WCOREDUMP
Damien Millerefb4afe2000-04-12 18:45:05 +10001883 packet_put_char(WCOREDUMP(status));
Damien Millerf3c6cf12000-05-17 22:08:29 +10001884#else /* WCOREDUMP */
1885 packet_put_char(0);
1886#endif /* WCOREDUMP */
Damien Millerefb4afe2000-04-12 18:45:05 +10001887 packet_put_cstring("");
1888 packet_put_cstring("");
1889 packet_send();
1890 } else {
1891 /* Some weird exit cause. Just exit. */
1892 packet_disconnect("wait returned status %04x.", status);
1893 }
1894
1895 /* disconnect channel */
1896 debug("session_exit_message: release channel %d", s->chanid);
1897 channel_cancel_cleanup(s->chanid);
Damien Miller166fca82000-04-20 07:42:21 +10001898 /*
1899 * emulate a write failure with 'chan_write_failed', nobody will be
1900 * interested in data we write.
1901 * Note that we must not call 'chan_read_failed', since there could
1902 * be some more data waiting in the pipe.
1903 */
Damien Millerbd483e72000-04-30 10:00:53 +10001904 if (c->ostate != CHAN_OUTPUT_CLOSED)
1905 chan_write_failed(c);
Damien Millerefb4afe2000-04-12 18:45:05 +10001906 s->chanid = -1;
1907}
1908
1909void
1910session_free(Session *s)
1911{
1912 debug("session_free: session %d pid %d", s->self, s->pid);
1913 if (s->term)
1914 xfree(s->term);
1915 if (s->display)
1916 xfree(s->display);
1917 if (s->auth_data)
1918 xfree(s->auth_data);
1919 if (s->auth_proto)
1920 xfree(s->auth_proto);
1921 s->used = 0;
1922}
1923
1924void
1925session_close(Session *s)
1926{
1927 session_pty_cleanup(s);
1928 session_free(s);
Damien Millere247cc42000-05-07 12:03:14 +10001929 session_proctitle(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001930}
1931
1932void
1933session_close_by_pid(pid_t pid, int status)
1934{
1935 Session *s = session_by_pid(pid);
1936 if (s == NULL) {
1937 debug("session_close_by_pid: no session for pid %d", s->pid);
1938 return;
1939 }
1940 if (s->chanid != -1)
1941 session_exit_message(s, status);
1942 session_close(s);
1943}
1944
1945/*
1946 * this is called when a channel dies before
1947 * the session 'child' itself dies
1948 */
1949void
1950session_close_by_channel(int id, void *arg)
1951{
1952 Session *s = session_by_channel(id);
1953 if (s == NULL) {
1954 debug("session_close_by_channel: no session for channel %d", id);
1955 return;
1956 }
1957 /* disconnect channel */
1958 channel_cancel_cleanup(s->chanid);
1959 s->chanid = -1;
1960
1961 debug("session_close_by_channel: channel %d kill %d", id, s->pid);
1962 if (s->pid == 0) {
1963 /* close session immediately */
1964 session_close(s);
1965 } else {
1966 /* notify child, delay session cleanup */
Damien Miller099f5052000-06-22 20:57:11 +10001967 if (s->pid <= 1)
Damien Miller7a445bb2000-06-26 13:12:37 +10001968 fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid);
1969 if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0)
Damien Millerefb4afe2000-04-12 18:45:05 +10001970 error("session_close_by_channel: kill %d: %s",
1971 s->pid, strerror(errno));
1972 }
1973}
1974
Damien Millere247cc42000-05-07 12:03:14 +10001975char *
1976session_tty_list(void)
1977{
1978 static char buf[1024];
1979 int i;
1980 buf[0] = '\0';
1981 for(i = 0; i < MAX_SESSIONS; i++) {
1982 Session *s = &sessions[i];
1983 if (s->used && s->ttyfd != -1) {
1984 if (buf[0] != '\0')
1985 strlcat(buf, ",", sizeof buf);
1986 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1987 }
1988 }
1989 if (buf[0] == '\0')
1990 strlcpy(buf, "notty", sizeof buf);
1991 return buf;
1992}
1993
1994void
1995session_proctitle(Session *s)
1996{
1997 if (s->pw == NULL)
1998 error("no user for session %d", s->self);
1999 else
2000 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2001}
2002
Damien Millerefb4afe2000-04-12 18:45:05 +10002003void
2004do_authenticated2(void)
2005{
Damien Miller87d29ed2000-08-30 09:21:22 +11002006#ifdef HAVE_LOGIN_CAP
Damien Millerad833b32000-08-23 10:46:23 +10002007 struct passwd *pw;
Damien Miller87d29ed2000-08-30 09:21:22 +11002008#endif
Damien Millerad833b32000-08-23 10:46:23 +10002009
Damien Millerefb4afe2000-04-12 18:45:05 +10002010 /*
2011 * Cancel the alarm we set to limit the time taken for
2012 * authentication.
2013 */
2014 alarm(0);
Damien Miller182ee6e2000-07-12 09:45:27 +10002015 if (startup_pipe != -1) {
Damien Miller4d97ba22000-07-11 18:15:50 +10002016 close(startup_pipe);
Damien Miller182ee6e2000-07-12 09:45:27 +10002017 startup_pipe = -1;
2018 }
Kevin Steves48b7cc02000-10-07 13:24:00 +00002019#if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
Damien Millerad833b32000-08-23 10:46:23 +10002020 pw = auth_get_user();
2021 if ((lc = login_getclass(pw->pw_class)) == NULL) {
2022 error("unable to get login class");
2023 return;
2024 }
2025#endif
Damien Millerefb4afe2000-04-12 18:45:05 +10002026 server_loop2();
Damien Miller1b26ab22000-04-30 10:12:49 +10002027 if (xauthfile)
2028 xauthfile_cleanup_proc(NULL);
Damien Millerefb4afe2000-04-12 18:45:05 +10002029}