blob: 3960c9f2564659481c1c1c247f80df61adfe4bd8 [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.
Ben Lindstrom92a2e382001-03-05 06:59:27 +000012 * 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 Lindstrom005dd222001-04-18 15:29:33 +000036RCSID("$OpenBSD: session.c,v 1.74 2001/04/17 19:34:25 markus Exp $");
Damien Millerb38eff82000-04-01 11:09:21 +100037
Damien Millerb38eff82000-04-01 11:09:21 +100038#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000039#include "ssh1.h"
40#include "ssh2.h"
41#include "xmalloc.h"
Ben Lindstromd95c09c2001-02-18 19:13:33 +000042#include "sshpty.h"
Damien Millerb38eff82000-04-01 11:09:21 +100043#include "packet.h"
44#include "buffer.h"
Damien Millerb38eff82000-04-01 11:09:21 +100045#include "mpaux.h"
Damien Millerb38eff82000-04-01 11:09:21 +100046#include "uidswap.h"
47#include "compat.h"
48#include "channels.h"
49#include "nchan.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100050#include "bufaux.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100051#include "auth.h"
Damien Millerf6d9e222000-06-18 14:50:44 +100052#include "auth-options.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000053#include "pathnames.h"
54#include "log.h"
55#include "servconf.h"
Ben Lindstromd95c09c2001-02-18 19:13:33 +000056#include "sshlogin.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000057#include "serverloop.h"
58#include "canohost.h"
Ben Lindstrom31ca54a2001-02-09 02:11:24 +000059#include "session.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100060
Damien Miller91606b12000-06-28 08:22:29 +100061#ifdef WITH_IRIX_PROJECT
62#include <proj.h>
63#endif /* WITH_IRIX_PROJECT */
Ben Lindstrom980754c2000-11-12 00:04:24 +000064#ifdef WITH_IRIX_JOBS
65#include <sys/resource.h>
Kevin Stevesef4eea92001-02-05 12:42:17 +000066#endif
Ben Lindstrom49a79c02000-11-17 03:47:20 +000067#ifdef WITH_IRIX_AUDIT
68#include <sat.h>
69#endif /* WITH_IRIX_AUDIT */
Damien Miller91606b12000-06-28 08:22:29 +100070
Damien Miller37023962000-07-11 17:31:38 +100071#if defined(HAVE_USERSEC_H)
72#include <usersec.h>
73#endif
74
Damien Millerbac2d8a2000-09-05 16:13:06 +110075#ifdef HAVE_CYGWIN
76#include <windows.h>
77#include <sys/cygwin.h>
78#define is_winnt (GetVersion() < 0x80000000)
79#endif
80
Damien Millerd17b8d52000-08-09 14:42:28 +100081/* AIX limits */
82#if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE)
Damien Miller0da2eaa2000-08-15 11:32:59 +100083# 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"
Damien Millerd17b8d52000-08-09 14:42:28 +100090#endif
91
Damien Miller168a7002001-03-17 10:29:50 +110092#ifdef _AIX
93# include <uinfo.h>
94#endif
95
Damien Millerb38eff82000-04-01 11:09:21 +100096/* types */
97
98#define TTYSZ 64
99typedef struct Session Session;
100struct Session {
101 int used;
102 int self;
103 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;
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000118 int is_subsystem;
Damien Millerb38eff82000-04-01 11:09:21 +1000119};
120
121/* func */
122
123Session *session_new(void);
124void session_set_fds(Session *s, int fdin, int fdout, int fderr);
125void session_pty_cleanup(Session *s);
Damien Millere247cc42000-05-07 12:03:14 +1000126void session_proctitle(Session *s);
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000127void do_exec_pty(Session *s, const char *command);
128void do_exec_no_pty(Session *s, const char *command);
Damien Miller69b69aa2000-10-28 14:19:58 +1100129void do_login(Session *s, const char *command);
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000130void do_child(Session *s, const char *command);
Damien Millercf205e82001-04-16 18:29:15 +1000131void do_motd(void);
132int check_quietlogin(Session *s, const char *command);
Damien Millerb38eff82000-04-01 11:09:21 +1000133
Ben Lindstromb31783d2001-03-22 02:02:12 +0000134void do_authenticated1(Authctxt *authctxt);
135void do_authenticated2(Authctxt *authctxt);
136
Damien Millerb38eff82000-04-01 11:09:21 +1000137/* import */
138extern ServerOptions options;
139extern char *__progname;
140extern int log_stderr;
141extern int debug_flag;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000142extern u_int utmp_len;
Damien Miller37023962000-07-11 17:31:38 +1000143extern int startup_pipe;
Ben Lindstrom005dd222001-04-18 15:29:33 +0000144extern void destroy_sensitive_data(void);
Damien Miller37023962000-07-11 17:31:38 +1000145
Damien Millerb38eff82000-04-01 11:09:21 +1000146/* Local Xauthority file. */
147static char *xauthfile;
148
Damien Miller7b28dc52000-09-05 13:34:53 +1100149/* original command from peer. */
Kevin Stevesef4eea92001-02-05 12:42:17 +0000150char *original_command = NULL;
Damien Miller7b28dc52000-09-05 13:34:53 +1100151
Damien Millerb38eff82000-04-01 11:09:21 +1000152/* data */
153#define MAX_SESSIONS 10
154Session sessions[MAX_SESSIONS];
Damien Miller15e7d4b2000-09-29 10:57:35 +1100155
Damien Millerd2c208a2000-05-17 22:00:02 +1000156#ifdef WITH_AIXAUTHENTICATE
157/* AIX's lastlogin message, set in auth1.c */
158char *aixloginmsg;
159#endif /* WITH_AIXAUTHENTICATE */
Damien Millerb38eff82000-04-01 11:09:21 +1000160
Damien Millerad833b32000-08-23 10:46:23 +1000161#ifdef HAVE_LOGIN_CAP
162static login_cap_t *lc;
163#endif
164
Ben Lindstromb31783d2001-03-22 02:02:12 +0000165void
166do_authenticated(Authctxt *authctxt)
167{
168 /*
169 * Cancel the alarm we set to limit the time taken for
170 * authentication.
171 */
172 alarm(0);
173 if (startup_pipe != -1) {
174 close(startup_pipe);
175 startup_pipe = -1;
176 }
177#if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
178 if ((lc = login_getclass(authctxt->pw->pw_class)) == NULL) {
179 error("unable to get login class");
180 return;
181 }
Ben Lindstrom005dd222001-04-18 15:29:33 +0000182#ifdef BSD_AUTH
183 if (auth_approval(NULL, lc, authctxt->pw->pw_name, "ssh") <= 0) {
184 packet_disconnect("Approval failure for %s",
185 authctxt->pw->pw_name);
186 }
187#endif
Ben Lindstromb31783d2001-03-22 02:02:12 +0000188#endif
189 /* setup the channel layer */
190 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
191 channel_permit_all_opens();
192
193 if (compat20)
194 do_authenticated2(authctxt);
195 else
196 do_authenticated1(authctxt);
197}
198
Damien Millerb38eff82000-04-01 11:09:21 +1000199/*
200 * Remove local Xauthority file.
201 */
202void
203xauthfile_cleanup_proc(void *ignore)
204{
205 debug("xauthfile_cleanup_proc called");
206
207 if (xauthfile != NULL) {
208 char *p;
209 unlink(xauthfile);
210 p = strrchr(xauthfile, '/');
211 if (p != NULL) {
212 *p = '\0';
213 rmdir(xauthfile);
214 }
215 xfree(xauthfile);
216 xauthfile = NULL;
217 }
218}
219
220/*
221 * Function to perform cleanup if we get aborted abnormally (e.g., due to a
222 * dropped connection).
223 */
Damien Miller4af51302000-04-16 11:18:38 +1000224void
Damien Millerb38eff82000-04-01 11:09:21 +1000225pty_cleanup_proc(void *session)
226{
227 Session *s=session;
228 if (s == NULL)
229 fatal("pty_cleanup_proc: no session");
230 debug("pty_cleanup_proc: %s", s->tty);
231
232 if (s->pid != 0) {
233 /* Record that the user has logged out. */
234 record_logout(s->pid, s->tty);
235 }
236
237 /* Release the pseudo-tty. */
238 pty_release(s->tty);
239}
240
241/*
242 * Prepares for an interactive session. This is called after the user has
243 * been successfully authenticated. During this message exchange, pseudo
244 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
245 * are requested, etc.
246 */
Damien Miller4af51302000-04-16 11:18:38 +1000247void
Ben Lindstromb31783d2001-03-22 02:02:12 +0000248do_authenticated1(Authctxt *authctxt)
Damien Millerb38eff82000-04-01 11:09:21 +1000249{
250 Session *s;
Damien Millerb38eff82000-04-01 11:09:21 +1000251 char *command;
Ben Lindstromb31783d2001-03-22 02:02:12 +0000252 int success, type, fd, n_bytes, plen, screen_flag, have_pty = 0;
253 int compression_level = 0, enable_compression_after_reply = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000254 u_int proto_len, data_len, dlen;
Damien Millerb38eff82000-04-01 11:09:21 +1000255
256 s = session_new();
Ben Lindstromb31783d2001-03-22 02:02:12 +0000257 s->pw = authctxt->pw;
Damien Millerad833b32000-08-23 10:46:23 +1000258
Damien Millerb38eff82000-04-01 11:09:21 +1000259 /*
260 * We stay in this loop until the client requests to execute a shell
261 * or a command.
262 */
263 for (;;) {
Ben Lindstromb31783d2001-03-22 02:02:12 +0000264 success = 0;
Damien Millerb38eff82000-04-01 11:09:21 +1000265
266 /* Get a packet from the client. */
267 type = packet_read(&plen);
268
269 /* Process the packet. */
270 switch (type) {
271 case SSH_CMSG_REQUEST_COMPRESSION:
272 packet_integrity_check(plen, 4, type);
273 compression_level = packet_get_int();
274 if (compression_level < 1 || compression_level > 9) {
275 packet_send_debug("Received illegal compression level %d.",
276 compression_level);
277 break;
278 }
279 /* Enable compression after we have responded with SUCCESS. */
280 enable_compression_after_reply = 1;
281 success = 1;
282 break;
283
284 case SSH_CMSG_REQUEST_PTY:
285 if (no_pty_flag) {
286 debug("Allocating a pty not permitted for this authentication.");
287 break;
288 }
289 if (have_pty)
290 packet_disconnect("Protocol error: you already have a pty.");
291
292 debug("Allocating pty.");
293
294 /* Allocate a pty and open it. */
295 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty,
296 sizeof(s->tty))) {
297 error("Failed to allocate pty.");
298 break;
299 }
300 fatal_add_cleanup(pty_cleanup_proc, (void *)s);
Ben Lindstromb31783d2001-03-22 02:02:12 +0000301 pty_setowner(s->pw, s->tty);
Damien Millerb38eff82000-04-01 11:09:21 +1000302
303 /* Get TERM from the packet. Note that the value may be of arbitrary length. */
304 s->term = packet_get_string(&dlen);
305 packet_integrity_check(dlen, strlen(s->term), type);
306 /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */
307 /* Remaining bytes */
308 n_bytes = plen - (4 + dlen + 4 * 4);
309
310 if (strcmp(s->term, "") == 0) {
311 xfree(s->term);
312 s->term = NULL;
313 }
314 /* Get window size from the packet. */
315 s->row = packet_get_int();
316 s->col = packet_get_int();
317 s->xpixel = packet_get_int();
318 s->ypixel = packet_get_int();
319 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
320
321 /* Get tty modes from the packet. */
322 tty_parse_modes(s->ttyfd, &n_bytes);
323 packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type);
324
Damien Millere247cc42000-05-07 12:03:14 +1000325 session_proctitle(s);
326
Damien Millerb38eff82000-04-01 11:09:21 +1000327 /* Indicate that we now have a pty. */
328 success = 1;
329 have_pty = 1;
330 break;
331
332 case SSH_CMSG_X11_REQUEST_FORWARDING:
333 if (!options.x11_forwarding) {
334 packet_send_debug("X11 forwarding disabled in server configuration file.");
335 break;
336 }
Damien Miller0c043c12000-06-07 21:22:38 +1000337 if (!options.xauth_location) {
338 packet_send_debug("No xauth program; cannot forward with spoofing.");
339 break;
340 }
Damien Millerb38eff82000-04-01 11:09:21 +1000341 if (no_x11_forwarding_flag) {
342 packet_send_debug("X11 forwarding not permitted for this authentication.");
343 break;
344 }
345 debug("Received request for X11 forwarding with auth spoofing.");
346 if (s->display != NULL)
347 packet_disconnect("Protocol error: X11 display already set.");
348
349 s->auth_proto = packet_get_string(&proto_len);
350 s->auth_data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +1000351
Ben Lindstrom7603b2d2001-02-26 20:13:32 +0000352 screen_flag = packet_get_protocol_flags() &
353 SSH_PROTOFLAG_SCREEN_NUMBER;
354 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
355
356 if (packet_remaining() == 4) {
357 if (!screen_flag)
358 debug2("Buggy client: "
359 "X11 screen flag missing");
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000360 packet_integrity_check(plen,
361 4 + proto_len + 4 + data_len + 4, type);
Damien Millerb38eff82000-04-01 11:09:21 +1000362 s->screen = packet_get_int();
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000363 } else {
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000364 packet_integrity_check(plen,
365 4 + proto_len + 4 + data_len, type);
Damien Millerb38eff82000-04-01 11:09:21 +1000366 s->screen = 0;
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000367 }
Damien Millerb38eff82000-04-01 11:09:21 +1000368 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
369
370 if (s->display == NULL)
371 break;
372
373 /* Setup to always have a local .Xauthority. */
374 xauthfile = xmalloc(MAXPATHLEN);
375 strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +0000376 temporarily_use_uid(s->pw);
Damien Millerb38eff82000-04-01 11:09:21 +1000377 if (mkdtemp(xauthfile) == NULL) {
378 restore_uid();
379 error("private X11 dir: mkdtemp %s failed: %s",
380 xauthfile, strerror(errno));
381 xfree(xauthfile);
382 xauthfile = NULL;
Damien Millerbd483e72000-04-30 10:00:53 +1000383 /* XXXX remove listening channels */
Damien Millerb38eff82000-04-01 11:09:21 +1000384 break;
385 }
386 strlcat(xauthfile, "/cookies", MAXPATHLEN);
Damien Miller7b28dc52000-09-05 13:34:53 +1100387 fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
388 if (fd >= 0)
389 close(fd);
Damien Millerb38eff82000-04-01 11:09:21 +1000390 restore_uid();
391 fatal_add_cleanup(xauthfile_cleanup_proc, NULL);
392 success = 1;
393 break;
Damien Millerb38eff82000-04-01 11:09:21 +1000394
395 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
396 if (no_agent_forwarding_flag || compat13) {
397 debug("Authentication agent forwarding not permitted for this authentication.");
398 break;
399 }
400 debug("Received authentication agent forwarding request.");
Ben Lindstromb31783d2001-03-22 02:02:12 +0000401 success = auth_input_request_forwarding(s->pw);
Damien Millerb38eff82000-04-01 11:09:21 +1000402 break;
403
404 case SSH_CMSG_PORT_FORWARD_REQUEST:
405 if (no_port_forwarding_flag) {
406 debug("Port forwarding not permitted for this authentication.");
407 break;
408 }
Damien Miller50a41ed2000-10-16 12:14:42 +1100409 if (!options.allow_tcp_forwarding) {
410 debug("Port forwarding not permitted.");
411 break;
412 }
Damien Millerb38eff82000-04-01 11:09:21 +1000413 debug("Received TCP/IP port forwarding request.");
Ben Lindstromb31783d2001-03-22 02:02:12 +0000414 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
Damien Millerb38eff82000-04-01 11:09:21 +1000415 success = 1;
416 break;
417
418 case SSH_CMSG_MAX_PACKET_SIZE:
419 if (packet_set_maxsize(packet_get_int()) > 0)
420 success = 1;
421 break;
422
423 case SSH_CMSG_EXEC_SHELL:
424 case SSH_CMSG_EXEC_CMD:
Damien Millerb38eff82000-04-01 11:09:21 +1000425 if (type == SSH_CMSG_EXEC_CMD) {
426 command = packet_get_string(&dlen);
427 debug("Exec command '%.500s'", command);
428 packet_integrity_check(plen, 4 + dlen, type);
429 } else {
430 command = NULL;
431 packet_integrity_check(plen, 0, type);
432 }
433 if (forced_command != NULL) {
Damien Miller7b28dc52000-09-05 13:34:53 +1100434 original_command = command;
Damien Millerb38eff82000-04-01 11:09:21 +1000435 command = forced_command;
436 debug("Forced command '%.500s'", forced_command);
437 }
438 if (have_pty)
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000439 do_exec_pty(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000440 else
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000441 do_exec_no_pty(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000442
443 if (command != NULL)
444 xfree(command);
445 /* Cleanup user's local Xauthority file. */
446 if (xauthfile)
447 xauthfile_cleanup_proc(NULL);
448 return;
449
450 default:
451 /*
452 * Any unknown messages in this phase are ignored,
453 * and a failure message is returned.
454 */
455 log("Unknown packet type received after authentication: %d", type);
456 }
457 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
458 packet_send();
459 packet_write_wait();
460
461 /* Enable compression now that we have replied if appropriate. */
462 if (enable_compression_after_reply) {
463 enable_compression_after_reply = 0;
464 packet_start_compression(compression_level);
465 }
466 }
467}
468
469/*
470 * This is called to fork and execute a command when we have no tty. This
471 * will call do_child from the child, and server_loop from the parent after
472 * setting up file descriptors and such.
473 */
Damien Miller4af51302000-04-16 11:18:38 +1000474void
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000475do_exec_no_pty(Session *s, const char *command)
Damien Millerb38eff82000-04-01 11:09:21 +1000476{
477 int pid;
478
479#ifdef USE_PIPES
480 int pin[2], pout[2], perr[2];
481 /* Allocate pipes for communicating with the program. */
482 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
483 packet_disconnect("Could not create pipes: %.100s",
484 strerror(errno));
485#else /* USE_PIPES */
486 int inout[2], err[2];
487 /* Uses socket pairs to communicate with the program. */
488 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
489 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
490 packet_disconnect("Could not create socket pairs: %.100s",
491 strerror(errno));
492#endif /* USE_PIPES */
493 if (s == NULL)
494 fatal("do_exec_no_pty: no session");
495
Damien Millere247cc42000-05-07 12:03:14 +1000496 session_proctitle(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000497
Damien Millerc5946332001-02-28 11:46:11 +1100498#if defined(USE_PAM)
Damien Millerf9e93002001-03-27 16:12:24 +1000499 do_pam_setcred(1);
Kevin Stevesff793a22001-02-21 16:36:51 +0000500#endif /* USE_PAM */
501
Damien Millerb38eff82000-04-01 11:09:21 +1000502 /* Fork the child. */
503 if ((pid = fork()) == 0) {
504 /* Child. Reinitialize the log since the pid has changed. */
505 log_init(__progname, options.log_level, options.log_facility, log_stderr);
506
507 /*
508 * Create a new session and process group since the 4.4BSD
509 * setlogin() affects the entire process group.
510 */
511 if (setsid() < 0)
512 error("setsid failed: %.100s", strerror(errno));
513
514#ifdef USE_PIPES
515 /*
516 * Redirect stdin. We close the parent side of the socket
517 * pair, and make the child side the standard input.
518 */
519 close(pin[1]);
520 if (dup2(pin[0], 0) < 0)
521 perror("dup2 stdin");
522 close(pin[0]);
523
524 /* Redirect stdout. */
525 close(pout[0]);
526 if (dup2(pout[1], 1) < 0)
527 perror("dup2 stdout");
528 close(pout[1]);
529
530 /* Redirect stderr. */
531 close(perr[0]);
532 if (dup2(perr[1], 2) < 0)
533 perror("dup2 stderr");
534 close(perr[1]);
535#else /* USE_PIPES */
536 /*
537 * Redirect stdin, stdout, and stderr. Stdin and stdout will
538 * use the same socket, as some programs (particularly rdist)
539 * seem to depend on it.
540 */
541 close(inout[1]);
542 close(err[1]);
543 if (dup2(inout[0], 0) < 0) /* stdin */
544 perror("dup2 stdin");
545 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
546 perror("dup2 stdout");
547 if (dup2(err[0], 2) < 0) /* stderr */
548 perror("dup2 stderr");
549#endif /* USE_PIPES */
550
551 /* Do processing for the child (exec command etc). */
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000552 do_child(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000553 /* NOTREACHED */
554 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100555#ifdef HAVE_CYGWIN
556 if (is_winnt)
557 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
558#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000559 if (pid < 0)
560 packet_disconnect("fork failed: %.100s", strerror(errno));
561 s->pid = pid;
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000562 /* Set interactive/non-interactive mode. */
563 packet_set_interactive(s->display != NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000564#ifdef USE_PIPES
565 /* We are the parent. Close the child sides of the pipes. */
566 close(pin[0]);
567 close(pout[1]);
568 close(perr[1]);
569
Damien Millerefb4afe2000-04-12 18:45:05 +1000570 if (compat20) {
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000571 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
Damien Millerefb4afe2000-04-12 18:45:05 +1000572 } else {
573 /* Enter the interactive session. */
574 server_loop(pid, pin[1], pout[0], perr[0]);
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000575 /* server_loop has closed pin[1], pout[0], and perr[0]. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000576 }
Damien Millerb38eff82000-04-01 11:09:21 +1000577#else /* USE_PIPES */
578 /* We are the parent. Close the child sides of the socket pairs. */
579 close(inout[0]);
580 close(err[0]);
581
582 /*
583 * Enter the interactive session. Note: server_loop must be able to
584 * handle the case that fdin and fdout are the same.
585 */
Damien Millerefb4afe2000-04-12 18:45:05 +1000586 if (compat20) {
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000587 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
Damien Millerefb4afe2000-04-12 18:45:05 +1000588 } else {
589 server_loop(pid, inout[1], inout[1], err[1]);
590 /* server_loop has closed inout[1] and err[1]. */
591 }
Damien Millerb38eff82000-04-01 11:09:21 +1000592#endif /* USE_PIPES */
593}
594
595/*
596 * This is called to fork and execute a command when we have a tty. This
597 * will call do_child from the child, and server_loop from the parent after
598 * setting up file descriptors, controlling tty, updating wtmp, utmp,
599 * lastlog, and other such operations.
600 */
Damien Miller4af51302000-04-16 11:18:38 +1000601void
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000602do_exec_pty(Session *s, const char *command)
Damien Millerb38eff82000-04-01 11:09:21 +1000603{
Damien Millerb38eff82000-04-01 11:09:21 +1000604 int fdout, ptyfd, ttyfd, ptymaster;
Damien Millerb38eff82000-04-01 11:09:21 +1000605 pid_t pid;
Damien Millerb38eff82000-04-01 11:09:21 +1000606
607 if (s == NULL)
608 fatal("do_exec_pty: no session");
609 ptyfd = s->ptyfd;
610 ttyfd = s->ttyfd;
611
Damien Millerc5946332001-02-28 11:46:11 +1100612#if defined(USE_PAM)
Ben Lindstromb31783d2001-03-22 02:02:12 +0000613 do_pam_session(s->pw->pw_name, s->tty);
Damien Millerf9e93002001-03-27 16:12:24 +1000614 do_pam_setcred(1);
Damien Miller5a761312001-02-27 09:28:23 +1100615#endif
Kevin Stevesff793a22001-02-21 16:36:51 +0000616
Damien Millerb38eff82000-04-01 11:09:21 +1000617 /* Fork the child. */
618 if ((pid = fork()) == 0) {
Damien Miller942da032000-08-18 13:59:06 +1000619 /* Child. Reinitialize the log because the pid has changed. */
Damien Millerb38eff82000-04-01 11:09:21 +1000620 log_init(__progname, options.log_level, options.log_facility, log_stderr);
621
622 /* Close the master side of the pseudo tty. */
623 close(ptyfd);
624
625 /* Make the pseudo tty our controlling tty. */
626 pty_make_controlling_tty(&ttyfd, s->tty);
627
628 /* Redirect stdin from the pseudo tty. */
629 if (dup2(ttyfd, fileno(stdin)) < 0)
630 error("dup2 stdin failed: %.100s", strerror(errno));
631
632 /* Redirect stdout to the pseudo tty. */
633 if (dup2(ttyfd, fileno(stdout)) < 0)
634 error("dup2 stdin failed: %.100s", strerror(errno));
635
636 /* Redirect stderr to the pseudo tty. */
637 if (dup2(ttyfd, fileno(stderr)) < 0)
638 error("dup2 stdin failed: %.100s", strerror(errno));
639
640 /* Close the extra descriptor for the pseudo tty. */
641 close(ttyfd);
642
Damien Miller942da032000-08-18 13:59:06 +1000643 /* record login, etc. similar to login(1) */
Damien Miller364a9bd2001-04-16 18:37:05 +1000644#ifndef HAVE_OSF_SIA
Damien Miller69b69aa2000-10-28 14:19:58 +1100645 if (!(options.use_login && command == NULL))
646 do_login(s, command);
Damien Miller364a9bd2001-04-16 18:37:05 +1000647#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000648
Damien Millerb38eff82000-04-01 11:09:21 +1000649 /* Do common processing for the child, such as execing the command. */
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000650 do_child(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000651 /* NOTREACHED */
652 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100653#ifdef HAVE_CYGWIN
654 if (is_winnt)
655 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
656#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000657 if (pid < 0)
658 packet_disconnect("fork failed: %.100s", strerror(errno));
659 s->pid = pid;
660
661 /* Parent. Close the slave side of the pseudo tty. */
662 close(ttyfd);
663
664 /*
665 * Create another descriptor of the pty master side for use as the
666 * standard input. We could use the original descriptor, but this
667 * simplifies code in server_loop. The descriptor is bidirectional.
668 */
669 fdout = dup(ptyfd);
670 if (fdout < 0)
671 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
672
673 /* we keep a reference to the pty master */
674 ptymaster = dup(ptyfd);
675 if (ptymaster < 0)
676 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
677 s->ptymaster = ptymaster;
678
679 /* Enter interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000680 packet_set_interactive(1);
Damien Millerefb4afe2000-04-12 18:45:05 +1000681 if (compat20) {
682 session_set_fds(s, ptyfd, fdout, -1);
683 } else {
684 server_loop(pid, ptyfd, fdout, -1);
685 /* server_loop _has_ closed ptyfd and fdout. */
686 session_pty_cleanup(s);
687 }
Damien Millerb38eff82000-04-01 11:09:21 +1000688}
689
Damien Miller942da032000-08-18 13:59:06 +1000690/* administrative, login(1)-like work */
691void
Damien Miller69b69aa2000-10-28 14:19:58 +1100692do_login(Session *s, const char *command)
Damien Miller942da032000-08-18 13:59:06 +1000693{
Damien Miller942da032000-08-18 13:59:06 +1000694 char *time_string;
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;
Damien Miller942da032000-08-18 13:59:06 +1000698 time_t last_login_time;
699 struct passwd * pw = s->pw;
700 pid_t pid = getpid();
701
702 /*
703 * Get IP address of client. If the connection is not a socket, let
704 * the address be 0.0.0.0.
705 */
706 memset(&from, 0, sizeof(from));
707 if (packet_connection_is_on_socket()) {
708 fromlen = sizeof(from);
709 if (getpeername(packet_get_connection_in(),
710 (struct sockaddr *) & from, &fromlen) < 0) {
711 debug("getpeername: %.100s", strerror(errno));
712 fatal_cleanup();
713 }
714 }
715
Damien Miller7b28dc52000-09-05 13:34:53 +1100716 /* Get the time and hostname when the user last logged in. */
Ben Lindstrom7bfff362001-03-26 05:45:53 +0000717 if (options.print_lastlog) {
718 hostname[0] = '\0';
719 last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
720 hostname, sizeof(hostname));
721 }
Damien Millere4340be2000-09-16 13:29:08 +1100722
Damien Miller942da032000-08-18 13:59:06 +1000723 /* Record that there was a login on that tty from the remote host. */
724 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
Ben Lindstromf15a3862001-04-05 23:32:17 +0000725 get_remote_name_or_ip(utmp_len, options.reverse_mapping_check),
726 (struct sockaddr *)&from);
Damien Miller942da032000-08-18 13:59:06 +1000727
Kevin Steves092f2ef2000-10-14 13:36:13 +0000728#ifdef USE_PAM
729 /*
730 * If password change is needed, do it now.
731 * This needs to occur before the ~/.hushlogin check.
732 */
Damien Miller646aa602001-02-15 11:51:32 +1100733 if (is_pam_password_change_required()) {
Kevin Steves092f2ef2000-10-14 13:36:13 +0000734 print_pam_messages();
735 do_pam_chauthtok();
736 }
737#endif
738
Damien Millercf205e82001-04-16 18:29:15 +1000739 if (check_quietlogin(s, command))
Damien Miller942da032000-08-18 13:59:06 +1000740 return;
741
742#ifdef USE_PAM
Damien Miller646aa602001-02-15 11:51:32 +1100743 if (!is_pam_password_change_required())
Kevin Steves092f2ef2000-10-14 13:36:13 +0000744 print_pam_messages();
Damien Miller942da032000-08-18 13:59:06 +1000745#endif /* USE_PAM */
746#ifdef WITH_AIXAUTHENTICATE
747 if (aixloginmsg && *aixloginmsg)
748 printf("%s\n", aixloginmsg);
749#endif /* WITH_AIXAUTHENTICATE */
750
Ben Lindstrom7bfff362001-03-26 05:45:53 +0000751 if (options.print_lastlog && last_login_time != 0) {
Damien Miller942da032000-08-18 13:59:06 +1000752 time_string = ctime(&last_login_time);
753 if (strchr(time_string, '\n'))
754 *strchr(time_string, '\n') = 0;
Kevin Stevesc368a3c2000-10-14 16:10:06 +0000755 if (strcmp(hostname, "") == 0)
Damien Miller942da032000-08-18 13:59:06 +1000756 printf("Last login: %s\r\n", time_string);
757 else
Damien Millere4340be2000-09-16 13:29:08 +1100758 printf("Last login: %s from %s\r\n", time_string, hostname);
Damien Miller942da032000-08-18 13:59:06 +1000759 }
Damien Millercf205e82001-04-16 18:29:15 +1000760
761 do_motd();
762}
763
764/*
765 * Display the message of the day.
766 */
767void
768do_motd(void)
769{
770 FILE *f;
771 char buf[256];
772
Damien Miller942da032000-08-18 13:59:06 +1000773 if (options.print_motd) {
Damien Millerad833b32000-08-23 10:46:23 +1000774#ifdef HAVE_LOGIN_CAP
775 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
776 "/etc/motd"), "r");
777#else
Damien Miller942da032000-08-18 13:59:06 +1000778 f = fopen("/etc/motd", "r");
Damien Millerad833b32000-08-23 10:46:23 +1000779#endif
Damien Miller942da032000-08-18 13:59:06 +1000780 if (f) {
781 while (fgets(buf, sizeof(buf), f))
782 fputs(buf, stdout);
783 fclose(f);
784 }
785 }
786}
787
Damien Millercf205e82001-04-16 18:29:15 +1000788
789/*
790 * Check for quiet login, either .hushlogin or command given.
791 */
792int
793check_quietlogin(Session *s, const char *command)
794{
795 char buf[256];
796 struct passwd * pw = s->pw;
797 struct stat st;
798
799 /* Return 1 if .hushlogin exists or a command given. */
800 if (command != NULL)
801 return 1;
802 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
803#ifdef HAVE_LOGIN_CAP
804 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
805 return 1;
806#else
807 if (stat(buf, &st) >= 0)
808 return 1;
809#endif
810 return 0;
811}
812
Damien Millerb38eff82000-04-01 11:09:21 +1000813/*
814 * Sets the value of the given variable in the environment. If the variable
815 * already exists, its value is overriden.
816 */
Damien Miller4af51302000-04-16 11:18:38 +1000817void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000818child_set_env(char ***envp, u_int *envsizep, const char *name,
Damien Millerb38eff82000-04-01 11:09:21 +1000819 const char *value)
820{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000821 u_int i, namelen;
Damien Millerb38eff82000-04-01 11:09:21 +1000822 char **env;
823
824 /*
825 * Find the slot where the value should be stored. If the variable
826 * already exists, we reuse the slot; otherwise we append a new slot
827 * at the end of the array, expanding if necessary.
828 */
829 env = *envp;
830 namelen = strlen(name);
831 for (i = 0; env[i]; i++)
832 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
833 break;
834 if (env[i]) {
835 /* Reuse the slot. */
836 xfree(env[i]);
837 } else {
838 /* New variable. Expand if necessary. */
839 if (i >= (*envsizep) - 1) {
840 (*envsizep) += 50;
841 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
842 }
843 /* Need to set the NULL pointer at end of array beyond the new slot. */
844 env[i + 1] = NULL;
845 }
846
847 /* Allocate space and format the variable in the appropriate slot. */
848 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
849 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
850}
851
852/*
853 * Reads environment variables from the given file and adds/overrides them
854 * into the environment. If the file does not exist, this does nothing.
855 * Otherwise, it must consist of empty lines, comments (line starts with '#')
856 * and assignments of the form name=value. No other forms are allowed.
857 */
Damien Miller4af51302000-04-16 11:18:38 +1000858void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000859read_environment_file(char ***env, u_int *envsize,
Damien Millerb38eff82000-04-01 11:09:21 +1000860 const char *filename)
861{
862 FILE *f;
863 char buf[4096];
864 char *cp, *value;
865
866 f = fopen(filename, "r");
867 if (!f)
868 return;
869
870 while (fgets(buf, sizeof(buf), f)) {
871 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
872 ;
873 if (!*cp || *cp == '#' || *cp == '\n')
874 continue;
875 if (strchr(cp, '\n'))
876 *strchr(cp, '\n') = '\0';
877 value = strchr(cp, '=');
878 if (value == NULL) {
879 fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
880 continue;
881 }
Damien Millerb1715dc2000-05-30 13:44:51 +1000882 /*
883 * Replace the equals sign by nul, and advance value to
884 * the value string.
885 */
Damien Millerb38eff82000-04-01 11:09:21 +1000886 *value = '\0';
887 value++;
888 child_set_env(env, envsize, cp, value);
889 }
890 fclose(f);
891}
892
893#ifdef USE_PAM
894/*
895 * Sets any environment variables which have been specified by PAM
896 */
897void do_pam_environment(char ***env, int *envsize)
898{
899 char *equals, var_name[512], var_val[512];
900 char **pam_env;
901 int i;
902
903 if ((pam_env = fetch_pam_environment()) == NULL)
904 return;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000905
Damien Millerb38eff82000-04-01 11:09:21 +1000906 for(i = 0; pam_env[i] != NULL; i++) {
907 if ((equals = strstr(pam_env[i], "=")) == NULL)
908 continue;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000909
Damien Millerb38eff82000-04-01 11:09:21 +1000910 if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) {
911 memset(var_name, '\0', sizeof(var_name));
912 memset(var_val, '\0', sizeof(var_val));
913
914 strncpy(var_name, pam_env[i], equals - pam_env[i]);
915 strcpy(var_val, equals + 1);
916
Damien Millercb5e44a2000-09-29 12:12:36 +1100917 debug3("PAM environment: %s=%s", var_name, var_val);
Damien Millerb38eff82000-04-01 11:09:21 +1000918
919 child_set_env(env, envsize, var_name, var_val);
920 }
921 }
922}
923#endif /* USE_PAM */
924
Damien Millercb5e44a2000-09-29 12:12:36 +1100925#ifdef HAVE_CYGWIN
926void copy_environment(char ***env, int *envsize)
927{
928 char *equals, var_name[512], var_val[512];
929 int i;
930
931 for(i = 0; environ[i] != NULL; i++) {
932 if ((equals = strstr(environ[i], "=")) == NULL)
933 continue;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000934
Damien Millercb5e44a2000-09-29 12:12:36 +1100935 if (strlen(environ[i]) < (sizeof(var_name) - 1)) {
936 memset(var_name, '\0', sizeof(var_name));
937 memset(var_val, '\0', sizeof(var_val));
938
939 strncpy(var_name, environ[i], equals - environ[i]);
940 strcpy(var_val, equals + 1);
941
942 debug3("Copy environment: %s=%s", var_name, var_val);
943
944 child_set_env(env, envsize, var_name, var_val);
945 }
946 }
947}
948#endif
949
Damien Miller5fc85652000-07-09 23:53:07 +1000950#if defined(HAVE_GETUSERATTR)
951/*
952 * AIX-specific login initialisation
953 */
954void set_limit(char *user, char *soft, char *hard, int resource, int mult)
955{
956 struct rlimit rlim;
Damien Miller65964d62000-07-11 09:16:22 +1000957 int slim, hlim;
Damien Miller5fc85652000-07-09 23:53:07 +1000958
959 getrlimit(resource, &rlim);
960
Damien Miller65964d62000-07-11 09:16:22 +1000961 slim = 0;
962 if (getuserattr(user, soft, &slim, SEC_INT) != -1) {
963 if (slim < 0) {
964 rlim.rlim_cur = RLIM_INFINITY;
965 } else if (slim != 0) {
966 /* See the wackiness below */
967 if (rlim.rlim_cur == slim * mult)
968 slim = 0;
969 else
970 rlim.rlim_cur = slim * mult;
971 }
972 }
Damien Miller5fc85652000-07-09 23:53:07 +1000973
Damien Miller65964d62000-07-11 09:16:22 +1000974 hlim = 0;
975 if (getuserattr(user, hard, &hlim, SEC_INT) != -1) {
976 if (hlim < 0) {
977 rlim.rlim_max = RLIM_INFINITY;
978 } else if (hlim != 0) {
979 rlim.rlim_max = hlim * mult;
980 }
981 }
Damien Miller5fc85652000-07-09 23:53:07 +1000982
Damien Miller65964d62000-07-11 09:16:22 +1000983 /*
984 * XXX For cpu and fsize the soft limit is set to the hard limit
985 * if the hard limit is left at its default value and the soft limit
986 * is changed from its default value, either by requesting it
987 * (slim == 0) or by setting it to the current default. At least
988 * that's how rlogind does it. If you're confused you're not alone.
989 * Bug or feature? AIX 4.3.1.2
990 */
991 if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu"))
992 && hlim == 0 && slim != 0)
993 rlim.rlim_max = rlim.rlim_cur;
994 /* A specified hard limit limits the soft limit */
995 else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max)
996 rlim.rlim_cur = rlim.rlim_max;
997 /* A soft limit can increase a hard limit */
998 else if (rlim.rlim_cur > rlim.rlim_max)
Damien Miller5fc85652000-07-09 23:53:07 +1000999 rlim.rlim_max = rlim.rlim_cur;
1000
1001 if (setrlimit(resource, &rlim) != 0)
Damien Miller65964d62000-07-11 09:16:22 +10001002 error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno));
Damien Miller5fc85652000-07-09 23:53:07 +10001003}
1004
1005void set_limits_from_userattr(char *user)
1006{
1007 int mask;
1008 char buf[16];
1009
1010 set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512);
1011 set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1);
1012 set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512);
1013 set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512);
1014 set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512);
1015 set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512);
1016#if defined(S_UNOFILE)
1017 set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1);
1018#endif
1019
1020 if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) {
1021 /* Convert decimal to octal */
1022 (void) snprintf(buf, sizeof(buf), "%d", mask);
1023 if (sscanf(buf, "%o", &mask) == 1)
1024 umask(mask);
1025 }
1026}
1027#endif /* defined(HAVE_GETUSERATTR) */
1028
Damien Millerb38eff82000-04-01 11:09:21 +10001029/*
1030 * Performs common processing for the child, such as setting up the
1031 * environment, closing extra file descriptors, setting the user and group
1032 * ids, and executing the command or shell.
1033 */
Damien Miller4af51302000-04-16 11:18:38 +10001034void
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001035do_child(Session *s, const char *command)
Damien Millerb38eff82000-04-01 11:09:21 +10001036{
Damien Miller7b28dc52000-09-05 13:34:53 +11001037 const char *shell, *hostname = NULL, *cp = NULL;
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001038 struct passwd * pw = s->pw;
Damien Millerb38eff82000-04-01 11:09:21 +10001039 char buf[256];
Damien Miller0c043c12000-06-07 21:22:38 +10001040 char cmd[1024];
Damien Millerad833b32000-08-23 10:46:23 +10001041 FILE *f = NULL;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001042 u_int envsize, i;
Damien Millerb38eff82000-04-01 11:09:21 +10001043 char **env;
1044 extern char **environ;
1045 struct stat st;
1046 char *argv[10];
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001047 int do_xauth = s->auth_proto != NULL && s->auth_data != NULL;
Damien Miller91606b12000-06-28 08:22:29 +10001048#ifdef WITH_IRIX_PROJECT
1049 prid_t projid;
1050#endif /* WITH_IRIX_PROJECT */
Ben Lindstrom980754c2000-11-12 00:04:24 +00001051#ifdef WITH_IRIX_JOBS
1052 jid_t jid = 0;
1053#else
1054#ifdef WITH_IRIX_ARRAY
1055 int jid = 0;
1056#endif /* WITH_IRIX_ARRAY */
1057#endif /* WITH_IRIX_JOBS */
1058
Ben Lindstrom005dd222001-04-18 15:29:33 +00001059 /* remove hostkey from the child's memory */
1060 destroy_sensitive_data();
1061
Damien Millerd3a18572000-06-07 19:55:44 +10001062 /* login(1) is only called if we execute the login shell */
1063 if (options.use_login && command != NULL)
1064 options.use_login = 0;
1065
Damien Miller364a9bd2001-04-16 18:37:05 +10001066#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
Damien Millerad833b32000-08-23 10:46:23 +10001067 if (!options.use_login) {
1068# ifdef HAVE_LOGIN_CAP
1069 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1070 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1071 _PATH_NOLOGIN), "r");
1072# else /* HAVE_LOGIN_CAP */
1073 if (pw->pw_uid)
1074 f = fopen(_PATH_NOLOGIN, "r");
1075# endif /* HAVE_LOGIN_CAP */
1076 if (f) {
1077 /* /etc/nologin exists. Print its contents and exit. */
1078 while (fgets(buf, sizeof(buf), f))
1079 fputs(buf, stderr);
1080 fclose(f);
Damien Millerb38eff82000-04-01 11:09:21 +10001081 exit(254);
Damien Millerad833b32000-08-23 10:46:23 +10001082 }
Damien Millerb38eff82000-04-01 11:09:21 +10001083 }
Damien Miller364a9bd2001-04-16 18:37:05 +10001084#endif /* USE_PAM || HAVE_OSF_SIA */
Damien Millerb38eff82000-04-01 11:09:21 +10001085
Damien Millerad833b32000-08-23 10:46:23 +10001086 /* Set login name, uid, gid, and groups. */
Damien Millerb38eff82000-04-01 11:09:21 +10001087 /* Login(1) does this as well, and it needs uid 0 for the "-h"
1088 switch, so we let login(1) to this for us. */
1089 if (!options.use_login) {
Damien Millerb8c656e2000-06-28 15:22:41 +10001090#ifdef HAVE_OSF_SIA
Damien Millerb69407d2001-03-21 16:13:03 +11001091 session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
Damien Miller364a9bd2001-04-16 18:37:05 +10001092 if (!check_quietlogin(s, command))
1093 do_motd();
Kevin Steves7fafa5c2001-02-13 18:45:00 +00001094#else /* HAVE_OSF_SIA */
Damien Millerbac2d8a2000-09-05 16:13:06 +11001095#ifdef HAVE_CYGWIN
1096 if (is_winnt) {
1097#else
Damien Millerb38eff82000-04-01 11:09:21 +10001098 if (getuid() == 0 || geteuid() == 0) {
Damien Millerbac2d8a2000-09-05 16:13:06 +11001099#endif
Damien Millerad833b32000-08-23 10:46:23 +10001100# ifdef HAVE_GETUSERATTR
Damien Miller5fc85652000-07-09 23:53:07 +10001101 set_limits_from_userattr(pw->pw_name);
Damien Millerad833b32000-08-23 10:46:23 +10001102# endif /* HAVE_GETUSERATTR */
1103# ifdef HAVE_LOGIN_CAP
1104 if (setusercontext(lc, pw, pw->pw_uid,
1105 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1106 perror("unable to set user context");
1107 exit(1);
1108 }
1109# else /* HAVE_LOGIN_CAP */
Ben Lindstrome1bd29b2001-02-21 20:00:28 +00001110#if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1111 /* Sets login uid for accounting */
1112 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1113 error("setluid: %s", strerror(errno));
1114#endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1115
Damien Millerad833b32000-08-23 10:46:23 +10001116 if (setlogin(pw->pw_name) < 0)
1117 error("setlogin failed: %s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10001118 if (setgid(pw->pw_gid) < 0) {
1119 perror("setgid");
1120 exit(1);
1121 }
1122 /* Initialize the group list. */
1123 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1124 perror("initgroups");
1125 exit(1);
1126 }
1127 endgrent();
Damien Millerf9e93002001-03-27 16:12:24 +10001128# ifdef USE_PAM
1129 /*
1130 * PAM credentials may take the form of
1131 * supplementary groups. These will have been
1132 * wiped by the above initgroups() call.
1133 * Reestablish them here.
1134 */
1135 do_pam_setcred(0);
1136# endif /* USE_PAM */
Ben Lindstrom980754c2000-11-12 00:04:24 +00001137# ifdef WITH_IRIX_JOBS
1138 jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive");
1139 if (jid == -1) {
1140 fatal("Failed to create job container: %.100s",
1141 strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00001142 }
Ben Lindstrom980754c2000-11-12 00:04:24 +00001143# endif /* WITH_IRIX_JOBS */
Damien Millerad833b32000-08-23 10:46:23 +10001144# ifdef WITH_IRIX_ARRAY
Damien Miller91606b12000-06-28 08:22:29 +10001145 /* initialize array session */
Ben Lindstrom980754c2000-11-12 00:04:24 +00001146 if (jid == 0) {
1147 if (newarraysess() != 0)
1148 fatal("Failed to set up new array session: %.100s",
1149 strerror(errno));
1150 }
Damien Millerad833b32000-08-23 10:46:23 +10001151# endif /* WITH_IRIX_ARRAY */
1152# ifdef WITH_IRIX_PROJECT
Damien Miller91606b12000-06-28 08:22:29 +10001153 /* initialize irix project info */
1154 if ((projid = getdfltprojuser(pw->pw_name)) == -1) {
1155 debug("Failed to get project id, using projid 0");
1156 projid = 0;
1157 }
Damien Miller91606b12000-06-28 08:22:29 +10001158 if (setprid(projid))
1159 fatal("Failed to initialize project %d for %s: %.100s",
1160 (int)projid, pw->pw_name, strerror(errno));
Damien Millerad833b32000-08-23 10:46:23 +10001161# endif /* WITH_IRIX_PROJECT */
Ben Lindstrom49a79c02000-11-17 03:47:20 +00001162#ifdef WITH_IRIX_AUDIT
1163 if (sysconf(_SC_AUDIT)) {
1164 debug("Setting sat id to %d", (int) pw->pw_uid);
1165 if (satsetid(pw->pw_uid))
1166 debug("error setting satid: %.100s", strerror(errno));
1167 }
1168#endif /* WITH_IRIX_AUDIT */
1169
Damien Miller168a7002001-03-17 10:29:50 +11001170#ifdef _AIX
1171 /*
1172 * AIX has a "usrinfo" area where logname and
1173 * other stuff is stored - a few applications
1174 * actually use this and die if it's not set
1175 */
Damien Millerbebd8be2001-03-22 11:58:15 +11001176 if (s->ttyfd == -1)
1177 s->tty[0] = '\0';
Damien Millerbe081762001-03-21 11:11:57 +11001178 cp = xmalloc(22 + strlen(s->tty) +
Damien Miller168a7002001-03-17 10:29:50 +11001179 2 * strlen(pw->pw_name));
1180 i = sprintf(cp, "LOGNAME=%s%cNAME=%s%cTTY=%s%c%c",
Damien Millerbebd8be2001-03-22 11:58:15 +11001181 pw->pw_name, 0, pw->pw_name, 0, s->tty, 0, 0);
Damien Miller168a7002001-03-17 10:29:50 +11001182 if (usrinfo(SETUINFO, cp, i) == -1)
1183 fatal("Couldn't set usrinfo: %s",
1184 strerror(errno));
1185 debug3("AIX/UsrInfo: set len %d", i);
1186 xfree(cp);
1187#endif
1188
Damien Millerb38eff82000-04-01 11:09:21 +10001189 /* Permanently switch to the desired uid. */
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +00001190 permanently_set_uid(pw);
Damien Millerad833b32000-08-23 10:46:23 +10001191# endif /* HAVE_LOGIN_CAP */
Damien Millerb38eff82000-04-01 11:09:21 +10001192 }
Damien Millerad833b32000-08-23 10:46:23 +10001193#endif /* HAVE_OSF_SIA */
1194
Damien Millerbac2d8a2000-09-05 16:13:06 +11001195#ifdef HAVE_CYGWIN
1196 if (is_winnt)
1197#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001198 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
Damien Millercaf6dd62000-08-29 11:33:50 +11001199 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
Damien Millerb38eff82000-04-01 11:09:21 +10001200 }
1201 /*
1202 * Get the shell from the password data. An empty shell field is
1203 * legal, and means /bin/sh.
1204 */
1205 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
Damien Millerad833b32000-08-23 10:46:23 +10001206#ifdef HAVE_LOGIN_CAP
1207 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1208#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001209
1210#ifdef AFS
1211 /* Try to get AFS tokens for the local cell. */
1212 if (k_hasafs()) {
1213 char cell[64];
1214
1215 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1216 krb_afslog(cell, 0);
1217
1218 krb_afslog(0, 0);
1219 }
1220#endif /* AFS */
1221
1222 /* Initialize the environment. */
1223 envsize = 100;
1224 env = xmalloc(envsize * sizeof(char *));
1225 env[0] = NULL;
1226
Damien Millerbac2d8a2000-09-05 16:13:06 +11001227#ifdef HAVE_CYGWIN
1228 /*
1229 * The Windows environment contains some setting which are
1230 * important for a running system. They must not be dropped.
1231 */
Damien Millercb5e44a2000-09-29 12:12:36 +11001232 copy_environment(&env, &envsize);
Damien Millerbac2d8a2000-09-05 16:13:06 +11001233#endif
1234
Damien Millerb38eff82000-04-01 11:09:21 +10001235 if (!options.use_login) {
1236 /* Set basic environment. */
1237 child_set_env(&env, &envsize, "USER", pw->pw_name);
1238 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
1239 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
Damien Millerad833b32000-08-23 10:46:23 +10001240#ifdef HAVE_LOGIN_CAP
1241 (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
1242 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
Damien Millercb5e44a2000-09-29 12:12:36 +11001243#else /* HAVE_LOGIN_CAP */
1244# ifndef HAVE_CYGWIN
Damien Millerbac2d8a2000-09-05 16:13:06 +11001245 /*
1246 * There's no standard path on Windows. The path contains
1247 * important components pointing to the system directories,
1248 * needed for loading shared libraries. So the path better
1249 * remains intact here.
1250 */
Damien Millerb38eff82000-04-01 11:09:21 +10001251 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
Damien Millercb5e44a2000-09-29 12:12:36 +11001252# endif /* HAVE_CYGWIN */
1253#endif /* HAVE_LOGIN_CAP */
Damien Millerb38eff82000-04-01 11:09:21 +10001254
1255 snprintf(buf, sizeof buf, "%.200s/%.50s",
1256 _PATH_MAILDIR, pw->pw_name);
1257 child_set_env(&env, &envsize, "MAIL", buf);
1258
1259 /* Normal systems set SHELL by default. */
1260 child_set_env(&env, &envsize, "SHELL", shell);
1261 }
1262 if (getenv("TZ"))
1263 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1264
1265 /* Set custom environment options from RSA authentication. */
1266 while (custom_environment) {
1267 struct envstring *ce = custom_environment;
1268 char *s = ce->s;
1269 int i;
1270 for (i = 0; s[i] != '=' && s[i]; i++);
1271 if (s[i] == '=') {
1272 s[i] = 0;
1273 child_set_env(&env, &envsize, s, s + i + 1);
1274 }
1275 custom_environment = ce->next;
1276 xfree(ce->s);
1277 xfree(ce);
1278 }
1279
1280 snprintf(buf, sizeof buf, "%.50s %d %d",
1281 get_remote_ipaddr(), get_remote_port(), get_local_port());
1282 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1283
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001284 if (s->ttyfd != -1)
1285 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1286 if (s->term)
1287 child_set_env(&env, &envsize, "TERM", s->term);
1288 if (s->display)
1289 child_set_env(&env, &envsize, "DISPLAY", s->display);
Damien Miller7b28dc52000-09-05 13:34:53 +11001290 if (original_command)
1291 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1292 original_command);
Damien Millerb38eff82000-04-01 11:09:21 +10001293
1294#ifdef _AIX
Damien Millercb5e44a2000-09-29 12:12:36 +11001295 if ((cp = getenv("AUTHSTATE")) != NULL)
1296 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1297 if ((cp = getenv("KRB5CCNAME")) != NULL)
1298 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1299 read_environment_file(&env, &envsize, "/etc/environment");
Damien Millerb38eff82000-04-01 11:09:21 +10001300#endif
1301
1302#ifdef KRB4
1303 {
1304 extern char *ticket;
1305
1306 if (ticket)
1307 child_set_env(&env, &envsize, "KRBTKFILE", ticket);
1308 }
1309#endif /* KRB4 */
1310
1311#ifdef USE_PAM
1312 /* Pull in any environment variables that may have been set by PAM. */
1313 do_pam_environment(&env, &envsize);
1314#endif /* USE_PAM */
1315
Damien Millerb38eff82000-04-01 11:09:21 +10001316 if (xauthfile)
1317 child_set_env(&env, &envsize, "XAUTHORITY", xauthfile);
1318 if (auth_get_socket_name() != NULL)
1319 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1320 auth_get_socket_name());
1321
1322 /* read $HOME/.ssh/environment. */
1323 if (!options.use_login) {
Damien Millerb1715dc2000-05-30 13:44:51 +10001324 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1325 pw->pw_dir);
Damien Millerb38eff82000-04-01 11:09:21 +10001326 read_environment_file(&env, &envsize, buf);
1327 }
1328 if (debug_flag) {
1329 /* dump the environment */
1330 fprintf(stderr, "Environment:\n");
1331 for (i = 0; env[i]; i++)
1332 fprintf(stderr, " %.200s\n", env[i]);
1333 }
Damien Millerad833b32000-08-23 10:46:23 +10001334 /* we have to stash the hostname before we close our socket. */
1335 if (options.use_login)
Ben Lindstromf15a3862001-04-05 23:32:17 +00001336 hostname = get_remote_name_or_ip(utmp_len,
1337 options.reverse_mapping_check);
Damien Millerb38eff82000-04-01 11:09:21 +10001338 /*
1339 * Close the connection descriptors; note that this is the child, and
1340 * the server will still have the socket open, and it is important
1341 * that we do not shutdown it. Note that the descriptors cannot be
1342 * closed before building the environment, as we call
1343 * get_remote_ipaddr there.
1344 */
1345 if (packet_get_connection_in() == packet_get_connection_out())
1346 close(packet_get_connection_in());
1347 else {
1348 close(packet_get_connection_in());
1349 close(packet_get_connection_out());
1350 }
1351 /*
1352 * Close all descriptors related to channels. They will still remain
1353 * open in the parent.
1354 */
1355 /* XXX better use close-on-exec? -markus */
1356 channel_close_all();
1357
1358 /*
1359 * Close any extra file descriptors. Note that there may still be
1360 * descriptors left by system functions. They will be closed later.
1361 */
1362 endpwent();
1363
1364 /*
1365 * Close any extra open file descriptors so that we don\'t have them
1366 * hanging around in clients. Note that we want to do this after
1367 * initgroups, because at least on Solaris 2.3 it leaves file
1368 * descriptors open.
1369 */
1370 for (i = 3; i < 64; i++)
1371 close(i);
1372
1373 /* Change current directory to the user\'s home directory. */
Damien Millerad833b32000-08-23 10:46:23 +10001374 if (chdir(pw->pw_dir) < 0) {
Damien Millerb38eff82000-04-01 11:09:21 +10001375 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1376 pw->pw_dir, strerror(errno));
Damien Millerad833b32000-08-23 10:46:23 +10001377#ifdef HAVE_LOGIN_CAP
1378 if (login_getcapbool(lc, "requirehome", 0))
1379 exit(1);
1380#endif
1381 }
Damien Millerb38eff82000-04-01 11:09:21 +10001382
1383 /*
1384 * Must take new environment into use so that .ssh/rc, /etc/sshrc and
1385 * xauth are run in the proper environment.
1386 */
1387 environ = env;
1388
1389 /*
1390 * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first
1391 * in this order).
1392 */
1393 if (!options.use_login) {
Ben Lindstrom005dd222001-04-18 15:29:33 +00001394 /* ignore _PATH_SSH_USER_RC for subsystems */
1395 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
Damien Millerb38eff82000-04-01 11:09:21 +10001396 if (debug_flag)
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001397 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1398 _PATH_SSH_USER_RC);
Ben Lindstrom226cfa02001-01-22 05:34:40 +00001399 f = popen(_PATH_BSHELL " " _PATH_SSH_USER_RC, "w");
Damien Millerb38eff82000-04-01 11:09:21 +10001400 if (f) {
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001401 if (do_xauth)
1402 fprintf(f, "%s %s\n", s->auth_proto,
1403 s->auth_data);
Damien Millerb38eff82000-04-01 11:09:21 +10001404 pclose(f);
1405 } else
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001406 fprintf(stderr, "Could not run %s\n",
1407 _PATH_SSH_USER_RC);
Ben Lindstrom226cfa02001-01-22 05:34:40 +00001408 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
Damien Millerb38eff82000-04-01 11:09:21 +10001409 if (debug_flag)
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001410 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1411 _PATH_SSH_SYSTEM_RC);
Damien Millerb38eff82000-04-01 11:09:21 +10001412
Ben Lindstrom226cfa02001-01-22 05:34:40 +00001413 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
Damien Millerb38eff82000-04-01 11:09:21 +10001414 if (f) {
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001415 if (do_xauth)
1416 fprintf(f, "%s %s\n", s->auth_proto,
1417 s->auth_data);
Damien Millerb38eff82000-04-01 11:09:21 +10001418 pclose(f);
1419 } else
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001420 fprintf(stderr, "Could not run %s\n",
1421 _PATH_SSH_SYSTEM_RC);
1422 } else if (do_xauth && options.xauth_location != NULL) {
Damien Millerb38eff82000-04-01 11:09:21 +10001423 /* Add authority data to .Xauthority if appropriate. */
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001424 char *screen = strchr(s->display, ':');
1425
1426 if (debug_flag) {
1427 fprintf(stderr,
1428 "Running %.100s add "
1429 "%.100s %.100s %.100s\n",
1430 options.xauth_location, s->display,
1431 s->auth_proto, s->auth_data);
1432 if (screen != NULL)
Damien Millerb1715dc2000-05-30 13:44:51 +10001433 fprintf(stderr,
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001434 "Adding %.*s/unix%s %s %s\n",
1435 (int)(screen - s->display),
1436 s->display, screen,
1437 s->auth_proto, s->auth_data);
1438 }
1439 snprintf(cmd, sizeof cmd, "%s -q -",
1440 options.xauth_location);
1441 f = popen(cmd, "w");
1442 if (f) {
1443 fprintf(f, "add %s %s %s\n", s->display,
1444 s->auth_proto, s->auth_data);
1445 if (screen != NULL)
1446 fprintf(f, "add %.*s/unix%s %s %s\n",
1447 (int)(screen - s->display),
1448 s->display, screen,
1449 s->auth_proto,
1450 s->auth_data);
1451 pclose(f);
1452 } else {
1453 fprintf(stderr, "Could not run %s\n",
1454 cmd);
Damien Millerb38eff82000-04-01 11:09:21 +10001455 }
1456 }
Damien Millerb38eff82000-04-01 11:09:21 +10001457 /* Get the last component of the shell name. */
1458 cp = strrchr(shell, '/');
1459 if (cp)
1460 cp++;
1461 else
1462 cp = shell;
1463 }
Ben Lindstromde71cda2001-03-24 00:43:26 +00001464
1465 /* restore SIGPIPE for child */
1466 signal(SIGPIPE, SIG_DFL);
1467
Damien Millerb38eff82000-04-01 11:09:21 +10001468 /*
1469 * If we have no command, execute the shell. In this case, the shell
1470 * name to be passed in argv[0] is preceded by '-' to indicate that
1471 * this is a login shell.
1472 */
1473 if (!command) {
1474 if (!options.use_login) {
1475 char buf[256];
1476
1477 /*
1478 * Check for mail if we have a tty and it was enabled
1479 * in server options.
1480 */
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001481 if (s->ttyfd != -1 && options.check_mail) {
Damien Millerb38eff82000-04-01 11:09:21 +10001482 char *mailbox;
1483 struct stat mailstat;
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001484
Damien Millerb38eff82000-04-01 11:09:21 +10001485 mailbox = getenv("MAIL");
1486 if (mailbox != NULL) {
Damien Millerb1715dc2000-05-30 13:44:51 +10001487 if (stat(mailbox, &mailstat) != 0 ||
1488 mailstat.st_size == 0)
Damien Millerb38eff82000-04-01 11:09:21 +10001489 printf("No mail.\n");
1490 else if (mailstat.st_mtime < mailstat.st_atime)
1491 printf("You have mail.\n");
1492 else
1493 printf("You have new mail.\n");
1494 }
1495 }
1496 /* Start the shell. Set initial character to '-'. */
1497 buf[0] = '-';
1498 strncpy(buf + 1, cp, sizeof(buf) - 1);
1499 buf[sizeof(buf) - 1] = 0;
1500
1501 /* Execute the shell. */
1502 argv[0] = buf;
1503 argv[1] = NULL;
1504 execve(shell, argv, env);
1505
1506 /* Executing the shell failed. */
1507 perror(shell);
1508 exit(1);
1509
1510 } else {
1511 /* Launch login(1). */
1512
Damien Millerad833b32000-08-23 10:46:23 +10001513 execl(LOGIN_PROGRAM, "login", "-h", hostname,
Damien Miller942da032000-08-18 13:59:06 +10001514 "-p", "-f", "--", pw->pw_name, NULL);
Damien Millerb38eff82000-04-01 11:09:21 +10001515
1516 /* Login couldn't be executed, die. */
1517
1518 perror("login");
1519 exit(1);
1520 }
1521 }
1522 /*
1523 * Execute the command using the user's shell. This uses the -c
1524 * option to execute the command.
1525 */
1526 argv[0] = (char *) cp;
1527 argv[1] = "-c";
1528 argv[2] = (char *) command;
1529 argv[3] = NULL;
1530 execve(shell, argv, env);
1531 perror(shell);
1532 exit(1);
1533}
1534
1535Session *
1536session_new(void)
1537{
1538 int i;
1539 static int did_init = 0;
1540 if (!did_init) {
1541 debug("session_new: init");
1542 for(i = 0; i < MAX_SESSIONS; i++) {
1543 sessions[i].used = 0;
1544 sessions[i].self = i;
1545 }
1546 did_init = 1;
1547 }
1548 for(i = 0; i < MAX_SESSIONS; i++) {
1549 Session *s = &sessions[i];
1550 if (! s->used) {
Ben Lindstrom60294322001-03-26 05:38:25 +00001551 memset(s, 0, sizeof(*s));
Damien Millerb38eff82000-04-01 11:09:21 +10001552 s->chanid = -1;
1553 s->ptyfd = -1;
1554 s->ttyfd = -1;
Damien Millerb38eff82000-04-01 11:09:21 +10001555 s->used = 1;
Damien Miller15b29522000-10-14 12:33:48 +11001556 debug("session_new: session %d", i);
Damien Millerb38eff82000-04-01 11:09:21 +10001557 return s;
1558 }
1559 }
1560 return NULL;
1561}
1562
1563void
1564session_dump(void)
1565{
1566 int i;
1567 for(i = 0; i < MAX_SESSIONS; i++) {
1568 Session *s = &sessions[i];
1569 debug("dump: used %d session %d %p channel %d pid %d",
1570 s->used,
1571 s->self,
1572 s,
1573 s->chanid,
1574 s->pid);
1575 }
1576}
1577
Damien Millerefb4afe2000-04-12 18:45:05 +10001578int
1579session_open(int chanid)
1580{
1581 Session *s = session_new();
1582 debug("session_open: channel %d", chanid);
1583 if (s == NULL) {
1584 error("no more sessions");
1585 return 0;
1586 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001587 s->pw = auth_get_user();
1588 if (s->pw == NULL)
Kevin Steves43cdef32001-02-11 14:12:08 +00001589 fatal("no user for session %d", s->self);
Damien Millerbd483e72000-04-30 10:00:53 +10001590 debug("session_open: session %d: link with channel %d", s->self, chanid);
1591 s->chanid = chanid;
Damien Millerefb4afe2000-04-12 18:45:05 +10001592 return 1;
1593}
1594
1595Session *
1596session_by_channel(int id)
1597{
1598 int i;
1599 for(i = 0; i < MAX_SESSIONS; i++) {
1600 Session *s = &sessions[i];
1601 if (s->used && s->chanid == id) {
1602 debug("session_by_channel: session %d channel %d", i, id);
1603 return s;
1604 }
1605 }
1606 debug("session_by_channel: unknown channel %d", id);
1607 session_dump();
1608 return NULL;
1609}
1610
1611Session *
1612session_by_pid(pid_t pid)
1613{
1614 int i;
1615 debug("session_by_pid: pid %d", pid);
1616 for(i = 0; i < MAX_SESSIONS; i++) {
1617 Session *s = &sessions[i];
1618 if (s->used && s->pid == pid)
1619 return s;
1620 }
1621 error("session_by_pid: unknown pid %d", pid);
1622 session_dump();
1623 return NULL;
1624}
1625
1626int
1627session_window_change_req(Session *s)
1628{
1629 s->col = packet_get_int();
1630 s->row = packet_get_int();
1631 s->xpixel = packet_get_int();
1632 s->ypixel = packet_get_int();
Damien Miller4af51302000-04-16 11:18:38 +10001633 packet_done();
Damien Millerefb4afe2000-04-12 18:45:05 +10001634 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1635 return 1;
1636}
1637
1638int
1639session_pty_req(Session *s)
1640{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001641 u_int len;
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001642 int n_bytes;
Damien Millerefb4afe2000-04-12 18:45:05 +10001643
Damien Millerf6d9e222000-06-18 14:50:44 +10001644 if (no_pty_flag)
1645 return 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001646 if (s->ttyfd != -1)
Damien Miller4af51302000-04-16 11:18:38 +10001647 return 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001648 s->term = packet_get_string(&len);
1649 s->col = packet_get_int();
1650 s->row = packet_get_int();
1651 s->xpixel = packet_get_int();
1652 s->ypixel = packet_get_int();
1653
1654 if (strcmp(s->term, "") == 0) {
1655 xfree(s->term);
1656 s->term = NULL;
1657 }
1658 /* Allocate a pty and open it. */
1659 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
1660 xfree(s->term);
1661 s->term = NULL;
1662 s->ptyfd = -1;
1663 s->ttyfd = -1;
1664 error("session_pty_req: session %d alloc failed", s->self);
Damien Miller4af51302000-04-16 11:18:38 +10001665 return 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001666 }
1667 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1668 /*
1669 * Add a cleanup function to clear the utmp entry and record logout
1670 * time in case we call fatal() (e.g., the connection gets closed).
1671 */
1672 fatal_add_cleanup(pty_cleanup_proc, (void *)s);
1673 pty_setowner(s->pw, s->tty);
1674 /* Get window size from the packet. */
1675 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1676
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001677 /* Get tty modes from the packet. */
1678 tty_parse_modes(s->ttyfd, &n_bytes);
1679 packet_done();
1680
Damien Millere247cc42000-05-07 12:03:14 +10001681 session_proctitle(s);
1682
Damien Millerefb4afe2000-04-12 18:45:05 +10001683 return 1;
1684}
1685
Damien Millerbd483e72000-04-30 10:00:53 +10001686int
1687session_subsystem_req(Session *s)
1688{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001689 u_int len;
Damien Millerbd483e72000-04-30 10:00:53 +10001690 int success = 0;
1691 char *subsys = packet_get_string(&len);
Damien Millerf6d9e222000-06-18 14:50:44 +10001692 int i;
Damien Millerbd483e72000-04-30 10:00:53 +10001693
1694 packet_done();
1695 log("subsystem request for %s", subsys);
1696
Damien Millerf6d9e222000-06-18 14:50:44 +10001697 for (i = 0; i < options.num_subsystems; i++) {
1698 if(strcmp(subsys, options.subsystem_name[i]) == 0) {
1699 debug("subsystem: exec() %s", options.subsystem_command[i]);
Ben Lindstromfc9b07d2001-03-22 01:27:23 +00001700 s->is_subsystem = 1;
Ben Lindstromb4c961d2001-03-22 01:25:37 +00001701 do_exec_no_pty(s, options.subsystem_command[i]);
Damien Millerf6d9e222000-06-18 14:50:44 +10001702 success = 1;
1703 }
1704 }
1705
1706 if (!success)
1707 log("subsystem request for %s failed, subsystem not found", subsys);
1708
Damien Millerbd483e72000-04-30 10:00:53 +10001709 xfree(subsys);
1710 return success;
1711}
1712
1713int
1714session_x11_req(Session *s)
1715{
Damien Miller7b28dc52000-09-05 13:34:53 +11001716 int fd;
Damien Miller37023962000-07-11 17:31:38 +10001717 if (no_x11_forwarding_flag) {
Damien Millerf6d9e222000-06-18 14:50:44 +10001718 debug("X11 forwarding disabled in user configuration file.");
1719 return 0;
1720 }
Damien Millerbd483e72000-04-30 10:00:53 +10001721 if (!options.x11_forwarding) {
1722 debug("X11 forwarding disabled in server configuration file.");
1723 return 0;
1724 }
1725 if (xauthfile != NULL) {
1726 debug("X11 fwd already started.");
1727 return 0;
1728 }
1729
1730 debug("Received request for X11 forwarding with auth spoofing.");
1731 if (s->display != NULL)
1732 packet_disconnect("Protocol error: X11 display already set.");
1733
1734 s->single_connection = packet_get_char();
1735 s->auth_proto = packet_get_string(NULL);
1736 s->auth_data = packet_get_string(NULL);
1737 s->screen = packet_get_int();
1738 packet_done();
1739
1740 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
1741 if (s->display == NULL) {
1742 xfree(s->auth_proto);
1743 xfree(s->auth_data);
1744 return 0;
1745 }
1746 xauthfile = xmalloc(MAXPATHLEN);
1747 strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +00001748 temporarily_use_uid(s->pw);
Damien Millerbd483e72000-04-30 10:00:53 +10001749 if (mkdtemp(xauthfile) == NULL) {
1750 restore_uid();
1751 error("private X11 dir: mkdtemp %s failed: %s",
1752 xauthfile, strerror(errno));
1753 xfree(xauthfile);
1754 xauthfile = NULL;
1755 xfree(s->auth_proto);
1756 xfree(s->auth_data);
1757 /* XXXX remove listening channels */
1758 return 0;
1759 }
1760 strlcat(xauthfile, "/cookies", MAXPATHLEN);
Damien Miller7b28dc52000-09-05 13:34:53 +11001761 fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
1762 if (fd >= 0)
1763 close(fd);
Damien Millerbd483e72000-04-30 10:00:53 +10001764 restore_uid();
1765 fatal_add_cleanup(xauthfile_cleanup_proc, s);
1766 return 1;
1767}
1768
Damien Millerf6d9e222000-06-18 14:50:44 +10001769int
1770session_shell_req(Session *s)
1771{
1772 /* if forced_command == NULL, the shell is execed */
1773 char *shell = forced_command;
1774 packet_done();
Damien Millerf6d9e222000-06-18 14:50:44 +10001775 if (s->ttyfd == -1)
Ben Lindstromb4c961d2001-03-22 01:25:37 +00001776 do_exec_no_pty(s, shell);
Damien Millerf6d9e222000-06-18 14:50:44 +10001777 else
Ben Lindstromb4c961d2001-03-22 01:25:37 +00001778 do_exec_pty(s, shell);
Damien Millerf6d9e222000-06-18 14:50:44 +10001779 return 1;
1780}
1781
1782int
1783session_exec_req(Session *s)
1784{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001785 u_int len;
Damien Millerf6d9e222000-06-18 14:50:44 +10001786 char *command = packet_get_string(&len);
1787 packet_done();
1788 if (forced_command) {
Damien Miller7b28dc52000-09-05 13:34:53 +11001789 original_command = command;
Damien Millerf6d9e222000-06-18 14:50:44 +10001790 command = forced_command;
1791 debug("Forced command '%.500s'", forced_command);
1792 }
Damien Millerf6d9e222000-06-18 14:50:44 +10001793 if (s->ttyfd == -1)
Ben Lindstromb4c961d2001-03-22 01:25:37 +00001794 do_exec_no_pty(s, command);
Damien Millerf6d9e222000-06-18 14:50:44 +10001795 else
Ben Lindstromb4c961d2001-03-22 01:25:37 +00001796 do_exec_pty(s, command);
Damien Millerf6d9e222000-06-18 14:50:44 +10001797 if (forced_command == NULL)
1798 xfree(command);
1799 return 1;
1800}
1801
Damien Miller0bc1bd82000-11-13 22:57:25 +11001802int
1803session_auth_agent_req(Session *s)
1804{
1805 static int called = 0;
1806 packet_done();
Ben Lindstrom14920292000-11-21 21:24:55 +00001807 if (no_agent_forwarding_flag) {
1808 debug("session_auth_agent_req: no_agent_forwarding_flag");
1809 return 0;
1810 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001811 if (called) {
1812 return 0;
1813 } else {
1814 called = 1;
1815 return auth_input_request_forwarding(s->pw);
1816 }
1817}
1818
Damien Millerefb4afe2000-04-12 18:45:05 +10001819void
1820session_input_channel_req(int id, void *arg)
1821{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001822 u_int len;
Damien Millerefb4afe2000-04-12 18:45:05 +10001823 int reply;
1824 int success = 0;
1825 char *rtype;
1826 Session *s;
1827 Channel *c;
1828
1829 rtype = packet_get_string(&len);
1830 reply = packet_get_char();
1831
1832 s = session_by_channel(id);
1833 if (s == NULL)
1834 fatal("session_input_channel_req: channel %d: no session", id);
1835 c = channel_lookup(id);
1836 if (c == NULL)
1837 fatal("session_input_channel_req: channel %d: bad channel", id);
1838
1839 debug("session_input_channel_req: session %d channel %d request %s reply %d",
1840 s->self, id, rtype, reply);
1841
1842 /*
Ben Lindstromfc9b07d2001-03-22 01:27:23 +00001843 * a session is in LARVAL state until a shell, a command
1844 * or a subsystem is executed
Damien Millerefb4afe2000-04-12 18:45:05 +10001845 */
1846 if (c->type == SSH_CHANNEL_LARVAL) {
1847 if (strcmp(rtype, "shell") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10001848 success = session_shell_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001849 } else if (strcmp(rtype, "exec") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10001850 success = session_exec_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001851 } else if (strcmp(rtype, "pty-req") == 0) {
Damien Miller5f056372000-04-16 12:31:48 +10001852 success = session_pty_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10001853 } else if (strcmp(rtype, "x11-req") == 0) {
1854 success = session_x11_req(s);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001855 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1856 success = session_auth_agent_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10001857 } else if (strcmp(rtype, "subsystem") == 0) {
1858 success = session_subsystem_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001859 }
1860 }
1861 if (strcmp(rtype, "window-change") == 0) {
1862 success = session_window_change_req(s);
1863 }
1864
1865 if (reply) {
1866 packet_start(success ?
1867 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1868 packet_put_int(c->remote_id);
1869 packet_send();
1870 }
1871 xfree(rtype);
1872}
1873
1874void
1875session_set_fds(Session *s, int fdin, int fdout, int fderr)
1876{
1877 if (!compat20)
1878 fatal("session_set_fds: called for proto != 2.0");
1879 /*
1880 * now that have a child and a pipe to the child,
1881 * we can activate our channel and register the fd's
1882 */
1883 if (s->chanid == -1)
1884 fatal("no channel for session %d", s->self);
1885 channel_set_fds(s->chanid,
1886 fdout, fdin, fderr,
Damien Miller69b69aa2000-10-28 14:19:58 +11001887 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1888 1);
Damien Millerefb4afe2000-04-12 18:45:05 +10001889}
1890
Damien Millerb38eff82000-04-01 11:09:21 +10001891void
1892session_pty_cleanup(Session *s)
1893{
1894 if (s == NULL || s->ttyfd == -1)
1895 return;
1896
Kevin Steves43cdef32001-02-11 14:12:08 +00001897 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
Damien Millerb38eff82000-04-01 11:09:21 +10001898
1899 /* Cancel the cleanup function. */
1900 fatal_remove_cleanup(pty_cleanup_proc, (void *)s);
1901
1902 /* Record that the user has logged out. */
1903 record_logout(s->pid, s->tty);
1904
1905 /* Release the pseudo-tty. */
1906 pty_release(s->tty);
1907
1908 /*
1909 * Close the server side of the socket pairs. We must do this after
1910 * the pty cleanup, so that another process doesn't get this pty
1911 * while we're still cleaning up.
1912 */
1913 if (close(s->ptymaster) < 0)
1914 error("close(s->ptymaster): %s", strerror(errno));
1915}
Damien Millerefb4afe2000-04-12 18:45:05 +10001916
1917void
1918session_exit_message(Session *s, int status)
1919{
1920 Channel *c;
1921 if (s == NULL)
1922 fatal("session_close: no session");
1923 c = channel_lookup(s->chanid);
1924 if (c == NULL)
1925 fatal("session_close: session %d: no channel %d",
1926 s->self, s->chanid);
1927 debug("session_exit_message: session %d channel %d pid %d",
1928 s->self, s->chanid, s->pid);
1929
1930 if (WIFEXITED(status)) {
1931 channel_request_start(s->chanid,
1932 "exit-status", 0);
1933 packet_put_int(WEXITSTATUS(status));
1934 packet_send();
1935 } else if (WIFSIGNALED(status)) {
1936 channel_request_start(s->chanid,
1937 "exit-signal", 0);
1938 packet_put_int(WTERMSIG(status));
Damien Millerf3c6cf12000-05-17 22:08:29 +10001939#ifdef WCOREDUMP
Damien Millerefb4afe2000-04-12 18:45:05 +10001940 packet_put_char(WCOREDUMP(status));
Damien Millerf3c6cf12000-05-17 22:08:29 +10001941#else /* WCOREDUMP */
1942 packet_put_char(0);
1943#endif /* WCOREDUMP */
Damien Millerefb4afe2000-04-12 18:45:05 +10001944 packet_put_cstring("");
1945 packet_put_cstring("");
1946 packet_send();
1947 } else {
1948 /* Some weird exit cause. Just exit. */
1949 packet_disconnect("wait returned status %04x.", status);
1950 }
1951
1952 /* disconnect channel */
1953 debug("session_exit_message: release channel %d", s->chanid);
1954 channel_cancel_cleanup(s->chanid);
Damien Miller166fca82000-04-20 07:42:21 +10001955 /*
1956 * emulate a write failure with 'chan_write_failed', nobody will be
1957 * interested in data we write.
1958 * Note that we must not call 'chan_read_failed', since there could
1959 * be some more data waiting in the pipe.
1960 */
Damien Millerbd483e72000-04-30 10:00:53 +10001961 if (c->ostate != CHAN_OUTPUT_CLOSED)
1962 chan_write_failed(c);
Damien Millerefb4afe2000-04-12 18:45:05 +10001963 s->chanid = -1;
1964}
1965
1966void
1967session_free(Session *s)
1968{
1969 debug("session_free: session %d pid %d", s->self, s->pid);
1970 if (s->term)
1971 xfree(s->term);
1972 if (s->display)
1973 xfree(s->display);
1974 if (s->auth_data)
1975 xfree(s->auth_data);
1976 if (s->auth_proto)
1977 xfree(s->auth_proto);
1978 s->used = 0;
1979}
1980
1981void
1982session_close(Session *s)
1983{
1984 session_pty_cleanup(s);
1985 session_free(s);
Damien Millere247cc42000-05-07 12:03:14 +10001986 session_proctitle(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001987}
1988
1989void
1990session_close_by_pid(pid_t pid, int status)
1991{
1992 Session *s = session_by_pid(pid);
1993 if (s == NULL) {
1994 debug("session_close_by_pid: no session for pid %d", s->pid);
1995 return;
1996 }
1997 if (s->chanid != -1)
1998 session_exit_message(s, status);
1999 session_close(s);
2000}
2001
2002/*
2003 * this is called when a channel dies before
2004 * the session 'child' itself dies
2005 */
2006void
2007session_close_by_channel(int id, void *arg)
2008{
2009 Session *s = session_by_channel(id);
2010 if (s == NULL) {
2011 debug("session_close_by_channel: no session for channel %d", id);
2012 return;
2013 }
2014 /* disconnect channel */
2015 channel_cancel_cleanup(s->chanid);
2016 s->chanid = -1;
2017
2018 debug("session_close_by_channel: channel %d kill %d", id, s->pid);
2019 if (s->pid == 0) {
2020 /* close session immediately */
2021 session_close(s);
2022 } else {
2023 /* notify child, delay session cleanup */
Damien Miller7a445bb2000-06-26 13:12:37 +10002024 if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0)
Damien Millerefb4afe2000-04-12 18:45:05 +10002025 error("session_close_by_channel: kill %d: %s",
2026 s->pid, strerror(errno));
2027 }
2028}
2029
Damien Millere247cc42000-05-07 12:03:14 +10002030char *
2031session_tty_list(void)
2032{
2033 static char buf[1024];
2034 int i;
2035 buf[0] = '\0';
2036 for(i = 0; i < MAX_SESSIONS; i++) {
2037 Session *s = &sessions[i];
2038 if (s->used && s->ttyfd != -1) {
2039 if (buf[0] != '\0')
2040 strlcat(buf, ",", sizeof buf);
2041 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
2042 }
2043 }
2044 if (buf[0] == '\0')
2045 strlcpy(buf, "notty", sizeof buf);
2046 return buf;
2047}
2048
2049void
2050session_proctitle(Session *s)
2051{
2052 if (s->pw == NULL)
2053 error("no user for session %d", s->self);
2054 else
2055 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2056}
2057
Damien Millerefb4afe2000-04-12 18:45:05 +10002058void
Ben Lindstromdb65e8f2001-01-19 04:26:52 +00002059do_authenticated2(Authctxt *authctxt)
Damien Millerefb4afe2000-04-12 18:45:05 +10002060{
Ben Lindstromb31783d2001-03-22 02:02:12 +00002061
Damien Millerefb4afe2000-04-12 18:45:05 +10002062 server_loop2();
Damien Miller1b26ab22000-04-30 10:12:49 +10002063 if (xauthfile)
2064 xauthfile_cleanup_proc(NULL);
Damien Millerefb4afe2000-04-12 18:45:05 +10002065}