blob: f2a1bf015863eba487b20b5959e1b8dd6a28d3c4 [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 Lindstrom44697232001-07-04 03:32:30 +000012 * Copyright (c) 2000, 2001 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 Lindstrom5d860f02002-08-01 01:28:38 +000036RCSID("$OpenBSD: session.c,v 1.146 2002/07/30 17:03:55 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"
Ben Lindstromc7637672001-06-09 00:36:26 +000048#include "channels.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100049#include "bufaux.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100050#include "auth.h"
Damien Millerf6d9e222000-06-18 14:50:44 +100051#include "auth-options.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000052#include "pathnames.h"
53#include "log.h"
54#include "servconf.h"
Ben Lindstromd95c09c2001-02-18 19:13:33 +000055#include "sshlogin.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000056#include "serverloop.h"
57#include "canohost.h"
Ben Lindstrom31ca54a2001-02-09 02:11:24 +000058#include "session.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000059#include "monitor_wrap.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100060
Damien Millerbac2d8a2000-09-05 16:13:06 +110061#ifdef HAVE_CYGWIN
62#include <windows.h>
63#include <sys/cygwin.h>
64#define is_winnt (GetVersion() < 0x80000000)
65#endif
66
Damien Millerb38eff82000-04-01 11:09:21 +100067/* func */
68
69Session *session_new(void);
Kevin Steves8f63caa2001-07-04 18:23:02 +000070void session_set_fds(Session *, int, int, int);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000071void session_pty_cleanup(void *);
Kevin Steves8f63caa2001-07-04 18:23:02 +000072void session_proctitle(Session *);
73int session_setup_x11fwd(Session *);
74void do_exec_pty(Session *, const char *);
75void do_exec_no_pty(Session *, const char *);
76void do_exec(Session *, const char *);
77void do_login(Session *, const char *);
Kevin Stevesa0957d62001-09-27 19:50:26 +000078#ifdef LOGIN_NEEDS_UTMPX
79static void do_pre_login(Session *s);
80#endif
Kevin Steves8f63caa2001-07-04 18:23:02 +000081void do_child(Session *, const char *);
Damien Millercf205e82001-04-16 18:29:15 +100082void do_motd(void);
Kevin Steves8f63caa2001-07-04 18:23:02 +000083int check_quietlogin(Session *, const char *);
Damien Millerb38eff82000-04-01 11:09:21 +100084
Ben Lindstrombba81212001-06-25 05:01:22 +000085static void do_authenticated1(Authctxt *);
86static void do_authenticated2(Authctxt *);
Kevin Steves8f63caa2001-07-04 18:23:02 +000087
Ben Lindstrombba81212001-06-25 05:01:22 +000088static int session_pty_req(Session *);
Ben Lindstromb31783d2001-03-22 02:02:12 +000089
Damien Millerb38eff82000-04-01 11:09:21 +100090/* import */
91extern ServerOptions options;
92extern char *__progname;
93extern int log_stderr;
94extern int debug_flag;
Ben Lindstrom46c16222000-12-22 01:43:59 +000095extern u_int utmp_len;
Damien Miller37023962000-07-11 17:31:38 +100096extern int startup_pipe;
Ben Lindstrom005dd222001-04-18 15:29:33 +000097extern void destroy_sensitive_data(void);
Damien Miller37023962000-07-11 17:31:38 +100098
Damien Miller7b28dc52000-09-05 13:34:53 +110099/* original command from peer. */
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000100const char *original_command = NULL;
Damien Miller7b28dc52000-09-05 13:34:53 +1100101
Damien Millerb38eff82000-04-01 11:09:21 +1000102/* data */
103#define MAX_SESSIONS 10
104Session sessions[MAX_SESSIONS];
Damien Miller15e7d4b2000-09-29 10:57:35 +1100105
Damien Millerd2c208a2000-05-17 22:00:02 +1000106#ifdef WITH_AIXAUTHENTICATE
Damien Millerd2c208a2000-05-17 22:00:02 +1000107char *aixloginmsg;
108#endif /* WITH_AIXAUTHENTICATE */
Damien Millerb38eff82000-04-01 11:09:21 +1000109
Damien Millerad833b32000-08-23 10:46:23 +1000110#ifdef HAVE_LOGIN_CAP
Ben Lindstromb481e132002-03-22 01:35:47 +0000111login_cap_t *lc;
Damien Millerad833b32000-08-23 10:46:23 +1000112#endif
113
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000114/* Name and directory of socket for authentication agent forwarding. */
115static char *auth_sock_name = NULL;
116static char *auth_sock_dir = NULL;
117
118/* removes the agent forwarding socket */
119
120static void
121auth_sock_cleanup_proc(void *_pw)
122{
123 struct passwd *pw = _pw;
124
125 if (auth_sock_name != NULL) {
126 temporarily_use_uid(pw);
127 unlink(auth_sock_name);
128 rmdir(auth_sock_dir);
129 auth_sock_name = NULL;
130 restore_uid();
131 }
132}
133
134static int
135auth_input_request_forwarding(struct passwd * pw)
136{
137 Channel *nc;
138 int sock;
139 struct sockaddr_un sunaddr;
140
141 if (auth_sock_name != NULL) {
142 error("authentication forwarding requested twice.");
143 return 0;
144 }
145
146 /* Temporarily drop privileged uid for mkdir/bind. */
147 temporarily_use_uid(pw);
148
149 /* Allocate a buffer for the socket name, and format the name. */
150 auth_sock_name = xmalloc(MAXPATHLEN);
151 auth_sock_dir = xmalloc(MAXPATHLEN);
152 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
153
154 /* Create private directory for socket */
155 if (mkdtemp(auth_sock_dir) == NULL) {
156 packet_send_debug("Agent forwarding disabled: "
157 "mkdtemp() failed: %.100s", strerror(errno));
158 restore_uid();
159 xfree(auth_sock_name);
160 xfree(auth_sock_dir);
161 auth_sock_name = NULL;
162 auth_sock_dir = NULL;
163 return 0;
164 }
Ben Lindstromce0f6342002-06-11 16:42:49 +0000165 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
166 auth_sock_dir, (long) getpid());
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000167
168 /* delete agent socket on fatal() */
169 fatal_add_cleanup(auth_sock_cleanup_proc, pw);
170
171 /* Create the socket. */
172 sock = socket(AF_UNIX, SOCK_STREAM, 0);
173 if (sock < 0)
174 packet_disconnect("socket: %.100s", strerror(errno));
175
176 /* Bind it to the name. */
177 memset(&sunaddr, 0, sizeof(sunaddr));
178 sunaddr.sun_family = AF_UNIX;
179 strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
180
181 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
182 packet_disconnect("bind: %.100s", strerror(errno));
183
184 /* Restore the privileged uid. */
185 restore_uid();
186
187 /* Start listening on the socket. */
188 if (listen(sock, 5) < 0)
189 packet_disconnect("listen: %.100s", strerror(errno));
190
191 /* Allocate a channel for the authentication agent socket. */
192 nc = channel_new("auth socket",
193 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
194 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
195 0, xstrdup("auth socket"), 1);
196 strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
197 return 1;
198}
199
200
Ben Lindstromb31783d2001-03-22 02:02:12 +0000201void
202do_authenticated(Authctxt *authctxt)
203{
204 /*
205 * Cancel the alarm we set to limit the time taken for
206 * authentication.
207 */
208 alarm(0);
209 if (startup_pipe != -1) {
210 close(startup_pipe);
211 startup_pipe = -1;
212 }
Damien Millere49d0962001-11-13 23:46:18 +1100213#ifdef WITH_AIXAUTHENTICATE
214 /* We don't have a pty yet, so just label the line as "ssh" */
215 if (loginsuccess(authctxt->user,
Damien Millerf3451a22002-02-05 12:40:46 +1100216 get_canonical_hostname(options.verify_reverse_mapping),
Damien Millere49d0962001-11-13 23:46:18 +1100217 "ssh", &aixloginmsg) < 0)
218 aixloginmsg = NULL;
219#endif /* WITH_AIXAUTHENTICATE */
220
Ben Lindstromb31783d2001-03-22 02:02:12 +0000221 /* setup the channel layer */
222 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
223 channel_permit_all_opens();
224
225 if (compat20)
226 do_authenticated2(authctxt);
227 else
228 do_authenticated1(authctxt);
Ben Lindstrom838394c2001-06-09 01:11:59 +0000229
Ben Lindstrom2bcdf062001-06-13 04:41:41 +0000230 /* remove agent socket */
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000231 if (auth_sock_name != NULL)
Ben Lindstrom983c0982001-06-09 01:20:06 +0000232 auth_sock_cleanup_proc(authctxt->pw);
Ben Lindstromec95ed92001-07-04 04:21:14 +0000233#ifdef KRB4
234 if (options.kerberos_ticket_cleanup)
235 krb4_cleanup_proc(authctxt);
236#endif
237#ifdef KRB5
238 if (options.kerberos_ticket_cleanup)
239 krb5_cleanup_proc(authctxt);
240#endif
Ben Lindstromb31783d2001-03-22 02:02:12 +0000241}
242
Damien Millerb38eff82000-04-01 11:09:21 +1000243/*
Damien Millerb38eff82000-04-01 11:09:21 +1000244 * Prepares for an interactive session. This is called after the user has
245 * been successfully authenticated. During this message exchange, pseudo
246 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
247 * are requested, etc.
248 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000249static void
Ben Lindstromb31783d2001-03-22 02:02:12 +0000250do_authenticated1(Authctxt *authctxt)
Damien Millerb38eff82000-04-01 11:09:21 +1000251{
252 Session *s;
Damien Millerb38eff82000-04-01 11:09:21 +1000253 char *command;
Damien Millerdff50992002-01-22 23:16:32 +1100254 int success, type, screen_flag;
Ben Lindstrome23f4a32002-06-23 21:40:16 +0000255 int enable_compression_after_reply = 0;
256 u_int proto_len, data_len, dlen, compression_level = 0;
Damien Millerb38eff82000-04-01 11:09:21 +1000257
258 s = session_new();
Ben Lindstromec95ed92001-07-04 04:21:14 +0000259 s->authctxt = authctxt;
Ben Lindstromb31783d2001-03-22 02:02:12 +0000260 s->pw = authctxt->pw;
Damien Millerad833b32000-08-23 10:46:23 +1000261
Damien Millerb38eff82000-04-01 11:09:21 +1000262 /*
263 * We stay in this loop until the client requests to execute a shell
264 * or a command.
265 */
266 for (;;) {
Ben Lindstromb31783d2001-03-22 02:02:12 +0000267 success = 0;
Damien Millerb38eff82000-04-01 11:09:21 +1000268
269 /* Get a packet from the client. */
Damien Millerdff50992002-01-22 23:16:32 +1100270 type = packet_read();
Damien Millerb38eff82000-04-01 11:09:21 +1000271
272 /* Process the packet. */
273 switch (type) {
274 case SSH_CMSG_REQUEST_COMPRESSION:
Damien Millerb38eff82000-04-01 11:09:21 +1000275 compression_level = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +1100276 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +1000277 if (compression_level < 1 || compression_level > 9) {
278 packet_send_debug("Received illegal compression level %d.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100279 compression_level);
Damien Millerb38eff82000-04-01 11:09:21 +1000280 break;
281 }
Ben Lindstrom23e0f662002-06-21 01:09:47 +0000282 if (!options.compression) {
283 debug2("compression disabled");
284 break;
285 }
Damien Millerb38eff82000-04-01 11:09:21 +1000286 /* Enable compression after we have responded with SUCCESS. */
287 enable_compression_after_reply = 1;
288 success = 1;
289 break;
290
291 case SSH_CMSG_REQUEST_PTY:
Ben Lindstrom49c12602001-06-13 04:37:36 +0000292 success = session_pty_req(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000293 break;
294
295 case SSH_CMSG_X11_REQUEST_FORWARDING:
Damien Millerb38eff82000-04-01 11:09:21 +1000296 s->auth_proto = packet_get_string(&proto_len);
297 s->auth_data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +1000298
Ben Lindstrom7603b2d2001-02-26 20:13:32 +0000299 screen_flag = packet_get_protocol_flags() &
300 SSH_PROTOFLAG_SCREEN_NUMBER;
301 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
302
303 if (packet_remaining() == 4) {
304 if (!screen_flag)
305 debug2("Buggy client: "
306 "X11 screen flag missing");
Damien Millerb38eff82000-04-01 11:09:21 +1000307 s->screen = packet_get_int();
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000308 } else {
Damien Millerb38eff82000-04-01 11:09:21 +1000309 s->screen = 0;
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000310 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100311 packet_check_eom();
Ben Lindstrom768176b2001-06-09 01:29:12 +0000312 success = session_setup_x11fwd(s);
313 if (!success) {
314 xfree(s->auth_proto);
315 xfree(s->auth_data);
Ben Lindstrom88259fb2001-06-12 00:21:34 +0000316 s->auth_proto = NULL;
317 s->auth_data = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +1000318 }
Damien Millerb38eff82000-04-01 11:09:21 +1000319 break;
Damien Millerb38eff82000-04-01 11:09:21 +1000320
321 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
322 if (no_agent_forwarding_flag || compat13) {
323 debug("Authentication agent forwarding not permitted for this authentication.");
324 break;
325 }
326 debug("Received authentication agent forwarding request.");
Ben Lindstromb31783d2001-03-22 02:02:12 +0000327 success = auth_input_request_forwarding(s->pw);
Damien Millerb38eff82000-04-01 11:09:21 +1000328 break;
329
330 case SSH_CMSG_PORT_FORWARD_REQUEST:
331 if (no_port_forwarding_flag) {
332 debug("Port forwarding not permitted for this authentication.");
333 break;
334 }
Damien Miller50a41ed2000-10-16 12:14:42 +1100335 if (!options.allow_tcp_forwarding) {
336 debug("Port forwarding not permitted.");
337 break;
338 }
Damien Millerb38eff82000-04-01 11:09:21 +1000339 debug("Received TCP/IP port forwarding request.");
Ben Lindstromb31783d2001-03-22 02:02:12 +0000340 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
Damien Millerb38eff82000-04-01 11:09:21 +1000341 success = 1;
342 break;
343
344 case SSH_CMSG_MAX_PACKET_SIZE:
345 if (packet_set_maxsize(packet_get_int()) > 0)
346 success = 1;
347 break;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100348
Ben Lindstromec95ed92001-07-04 04:21:14 +0000349#if defined(AFS) || defined(KRB5)
350 case SSH_CMSG_HAVE_KERBEROS_TGT:
351 if (!options.kerberos_tgt_passing) {
352 verbose("Kerberos TGT passing disabled.");
353 } else {
354 char *kdata = packet_get_string(&dlen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100355 packet_check_eom();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100356
Ben Lindstromec95ed92001-07-04 04:21:14 +0000357 /* XXX - 0x41, see creds_to_radix version */
358 if (kdata[0] != 0x41) {
359#ifdef KRB5
360 krb5_data tgt;
361 tgt.data = kdata;
362 tgt.length = dlen;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100363
Ben Lindstromec95ed92001-07-04 04:21:14 +0000364 if (auth_krb5_tgt(s->authctxt, &tgt))
365 success = 1;
366 else
367 verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user);
368#endif /* KRB5 */
369 } else {
370#ifdef AFS
371 if (auth_krb4_tgt(s->authctxt, kdata))
372 success = 1;
373 else
374 verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user);
375#endif /* AFS */
376 }
377 xfree(kdata);
378 }
379 break;
380#endif /* AFS || KRB5 */
Damien Miller9f0f5c62001-12-21 14:45:46 +1100381
Ben Lindstromec95ed92001-07-04 04:21:14 +0000382#ifdef AFS
383 case SSH_CMSG_HAVE_AFS_TOKEN:
384 if (!options.afs_token_passing || !k_hasafs()) {
385 verbose("AFS token passing disabled.");
386 } else {
387 /* Accept AFS token. */
388 char *token = packet_get_string(&dlen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100389 packet_check_eom();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100390
Ben Lindstromec95ed92001-07-04 04:21:14 +0000391 if (auth_afs_token(s->authctxt, token))
392 success = 1;
393 else
394 verbose("AFS token refused for %.100s",
395 s->authctxt->user);
396 xfree(token);
397 }
398 break;
399#endif /* AFS */
Damien Millerb38eff82000-04-01 11:09:21 +1000400
401 case SSH_CMSG_EXEC_SHELL:
402 case SSH_CMSG_EXEC_CMD:
Damien Millerb38eff82000-04-01 11:09:21 +1000403 if (type == SSH_CMSG_EXEC_CMD) {
404 command = packet_get_string(&dlen);
405 debug("Exec command '%.500s'", command);
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000406 do_exec(s, command);
407 xfree(command);
Damien Millerb38eff82000-04-01 11:09:21 +1000408 } else {
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000409 do_exec(s, NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000410 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100411 packet_check_eom();
Ben Lindstromcb3929d2001-06-09 01:34:15 +0000412 session_close(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000413 return;
414
415 default:
416 /*
417 * Any unknown messages in this phase are ignored,
418 * and a failure message is returned.
419 */
420 log("Unknown packet type received after authentication: %d", type);
421 }
422 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
423 packet_send();
424 packet_write_wait();
425
426 /* Enable compression now that we have replied if appropriate. */
427 if (enable_compression_after_reply) {
428 enable_compression_after_reply = 0;
429 packet_start_compression(compression_level);
430 }
431 }
432}
433
434/*
435 * This is called to fork and execute a command when we have no tty. This
436 * will call do_child from the child, and server_loop from the parent after
437 * setting up file descriptors and such.
438 */
Damien Miller4af51302000-04-16 11:18:38 +1000439void
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000440do_exec_no_pty(Session *s, const char *command)
Damien Millerb38eff82000-04-01 11:09:21 +1000441{
Ben Lindstromce0f6342002-06-11 16:42:49 +0000442 pid_t pid;
Damien Millerb38eff82000-04-01 11:09:21 +1000443
444#ifdef USE_PIPES
445 int pin[2], pout[2], perr[2];
446 /* Allocate pipes for communicating with the program. */
447 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
448 packet_disconnect("Could not create pipes: %.100s",
449 strerror(errno));
450#else /* USE_PIPES */
451 int inout[2], err[2];
452 /* Uses socket pairs to communicate with the program. */
453 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
454 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
455 packet_disconnect("Could not create socket pairs: %.100s",
456 strerror(errno));
457#endif /* USE_PIPES */
458 if (s == NULL)
459 fatal("do_exec_no_pty: no session");
460
Damien Millere247cc42000-05-07 12:03:14 +1000461 session_proctitle(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000462
Damien Millerc5946332001-02-28 11:46:11 +1100463#if defined(USE_PAM)
Damien Miller665af9c2001-06-27 09:34:15 +1000464 do_pam_session(s->pw->pw_name, NULL);
Damien Millerf9e93002001-03-27 16:12:24 +1000465 do_pam_setcred(1);
Damien Millerc3aa3dd2001-10-28 22:34:52 +1100466 if (is_pam_password_change_required())
467 packet_disconnect("Password change required but no "
468 "TTY available");
Kevin Stevesff793a22001-02-21 16:36:51 +0000469#endif /* USE_PAM */
470
Damien Millerb38eff82000-04-01 11:09:21 +1000471 /* Fork the child. */
472 if ((pid = fork()) == 0) {
Ben Lindstrom264ee302002-07-23 21:01:56 +0000473 fatal_remove_all_cleanups();
474
Damien Millerb38eff82000-04-01 11:09:21 +1000475 /* Child. Reinitialize the log since the pid has changed. */
476 log_init(__progname, options.log_level, options.log_facility, log_stderr);
477
478 /*
479 * Create a new session and process group since the 4.4BSD
480 * setlogin() affects the entire process group.
481 */
482 if (setsid() < 0)
483 error("setsid failed: %.100s", strerror(errno));
484
485#ifdef USE_PIPES
486 /*
487 * Redirect stdin. We close the parent side of the socket
488 * pair, and make the child side the standard input.
489 */
490 close(pin[1]);
491 if (dup2(pin[0], 0) < 0)
492 perror("dup2 stdin");
493 close(pin[0]);
494
495 /* Redirect stdout. */
496 close(pout[0]);
497 if (dup2(pout[1], 1) < 0)
498 perror("dup2 stdout");
499 close(pout[1]);
500
501 /* Redirect stderr. */
502 close(perr[0]);
503 if (dup2(perr[1], 2) < 0)
504 perror("dup2 stderr");
505 close(perr[1]);
506#else /* USE_PIPES */
507 /*
508 * Redirect stdin, stdout, and stderr. Stdin and stdout will
509 * use the same socket, as some programs (particularly rdist)
510 * seem to depend on it.
511 */
512 close(inout[1]);
513 close(err[1]);
514 if (dup2(inout[0], 0) < 0) /* stdin */
515 perror("dup2 stdin");
516 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
517 perror("dup2 stdout");
518 if (dup2(err[0], 2) < 0) /* stderr */
519 perror("dup2 stderr");
520#endif /* USE_PIPES */
521
522 /* Do processing for the child (exec command etc). */
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000523 do_child(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000524 /* NOTREACHED */
525 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100526#ifdef HAVE_CYGWIN
527 if (is_winnt)
528 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
529#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000530 if (pid < 0)
531 packet_disconnect("fork failed: %.100s", strerror(errno));
532 s->pid = pid;
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000533 /* Set interactive/non-interactive mode. */
534 packet_set_interactive(s->display != NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000535#ifdef USE_PIPES
536 /* We are the parent. Close the child sides of the pipes. */
537 close(pin[0]);
538 close(pout[1]);
539 close(perr[1]);
540
Damien Millerefb4afe2000-04-12 18:45:05 +1000541 if (compat20) {
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000542 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
Damien Millerefb4afe2000-04-12 18:45:05 +1000543 } else {
544 /* Enter the interactive session. */
545 server_loop(pid, pin[1], pout[0], perr[0]);
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000546 /* server_loop has closed pin[1], pout[0], and perr[0]. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000547 }
Damien Millerb38eff82000-04-01 11:09:21 +1000548#else /* USE_PIPES */
549 /* We are the parent. Close the child sides of the socket pairs. */
550 close(inout[0]);
551 close(err[0]);
552
553 /*
554 * Enter the interactive session. Note: server_loop must be able to
555 * handle the case that fdin and fdout are the same.
556 */
Damien Millerefb4afe2000-04-12 18:45:05 +1000557 if (compat20) {
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000558 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
Damien Millerefb4afe2000-04-12 18:45:05 +1000559 } else {
560 server_loop(pid, inout[1], inout[1], err[1]);
561 /* server_loop has closed inout[1] and err[1]. */
562 }
Damien Millerb38eff82000-04-01 11:09:21 +1000563#endif /* USE_PIPES */
564}
565
566/*
567 * This is called to fork and execute a command when we have a tty. This
568 * will call do_child from the child, and server_loop from the parent after
569 * setting up file descriptors, controlling tty, updating wtmp, utmp,
570 * lastlog, and other such operations.
571 */
Damien Miller4af51302000-04-16 11:18:38 +1000572void
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000573do_exec_pty(Session *s, const char *command)
Damien Millerb38eff82000-04-01 11:09:21 +1000574{
Damien Millerb38eff82000-04-01 11:09:21 +1000575 int fdout, ptyfd, ttyfd, ptymaster;
Damien Millerb38eff82000-04-01 11:09:21 +1000576 pid_t pid;
Damien Millerb38eff82000-04-01 11:09:21 +1000577
578 if (s == NULL)
579 fatal("do_exec_pty: no session");
580 ptyfd = s->ptyfd;
581 ttyfd = s->ttyfd;
582
Damien Millerc5946332001-02-28 11:46:11 +1100583#if defined(USE_PAM)
Ben Lindstromb31783d2001-03-22 02:02:12 +0000584 do_pam_session(s->pw->pw_name, s->tty);
Damien Millerf9e93002001-03-27 16:12:24 +1000585 do_pam_setcred(1);
Damien Miller5a761312001-02-27 09:28:23 +1100586#endif
Kevin Stevesff793a22001-02-21 16:36:51 +0000587
Damien Millerb38eff82000-04-01 11:09:21 +1000588 /* Fork the child. */
589 if ((pid = fork()) == 0) {
Ben Lindstrom264ee302002-07-23 21:01:56 +0000590 fatal_remove_all_cleanups();
Ben Lindstrombddd5512001-07-04 04:53:53 +0000591
Damien Miller942da032000-08-18 13:59:06 +1000592 /* Child. Reinitialize the log because the pid has changed. */
Damien Millerb38eff82000-04-01 11:09:21 +1000593 log_init(__progname, options.log_level, options.log_facility, log_stderr);
Damien Millerb38eff82000-04-01 11:09:21 +1000594 /* Close the master side of the pseudo tty. */
595 close(ptyfd);
596
597 /* Make the pseudo tty our controlling tty. */
598 pty_make_controlling_tty(&ttyfd, s->tty);
599
Damien Miller9c751422001-10-10 15:02:46 +1000600 /* Redirect stdin/stdout/stderr from the pseudo tty. */
601 if (dup2(ttyfd, 0) < 0)
602 error("dup2 stdin: %s", strerror(errno));
603 if (dup2(ttyfd, 1) < 0)
604 error("dup2 stdout: %s", strerror(errno));
605 if (dup2(ttyfd, 2) < 0)
606 error("dup2 stderr: %s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +1000607
608 /* Close the extra descriptor for the pseudo tty. */
609 close(ttyfd);
610
Damien Miller942da032000-08-18 13:59:06 +1000611 /* record login, etc. similar to login(1) */
Damien Miller364a9bd2001-04-16 18:37:05 +1000612#ifndef HAVE_OSF_SIA
Damien Miller69b69aa2000-10-28 14:19:58 +1100613 if (!(options.use_login && command == NULL))
614 do_login(s, command);
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000615# ifdef LOGIN_NEEDS_UTMPX
616 else
617 do_pre_login(s);
618# endif
Damien Miller364a9bd2001-04-16 18:37:05 +1000619#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000620
Damien Millerb38eff82000-04-01 11:09:21 +1000621 /* Do common processing for the child, such as execing the command. */
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000622 do_child(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000623 /* NOTREACHED */
624 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100625#ifdef HAVE_CYGWIN
626 if (is_winnt)
627 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
628#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000629 if (pid < 0)
630 packet_disconnect("fork failed: %.100s", strerror(errno));
631 s->pid = pid;
632
633 /* Parent. Close the slave side of the pseudo tty. */
634 close(ttyfd);
635
636 /*
637 * Create another descriptor of the pty master side for use as the
638 * standard input. We could use the original descriptor, but this
639 * simplifies code in server_loop. The descriptor is bidirectional.
640 */
641 fdout = dup(ptyfd);
642 if (fdout < 0)
643 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
644
645 /* we keep a reference to the pty master */
646 ptymaster = dup(ptyfd);
647 if (ptymaster < 0)
648 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
649 s->ptymaster = ptymaster;
650
651 /* Enter interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000652 packet_set_interactive(1);
Damien Millerefb4afe2000-04-12 18:45:05 +1000653 if (compat20) {
654 session_set_fds(s, ptyfd, fdout, -1);
655 } else {
656 server_loop(pid, ptyfd, fdout, -1);
657 /* server_loop _has_ closed ptyfd and fdout. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000658 }
Damien Millerb38eff82000-04-01 11:09:21 +1000659}
660
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000661#ifdef LOGIN_NEEDS_UTMPX
Damien Miller599d8eb2001-09-15 12:25:53 +1000662static void
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000663do_pre_login(Session *s)
664{
665 socklen_t fromlen;
666 struct sockaddr_storage from;
667 pid_t pid = getpid();
668
669 /*
670 * Get IP address of client. If the connection is not a socket, let
671 * the address be 0.0.0.0.
672 */
673 memset(&from, 0, sizeof(from));
674 if (packet_connection_is_on_socket()) {
675 fromlen = sizeof(from);
676 if (getpeername(packet_get_connection_in(),
Damien Miller9f0f5c62001-12-21 14:45:46 +1100677 (struct sockaddr *) & from, &fromlen) < 0) {
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000678 debug("getpeername: %.100s", strerror(errno));
679 fatal_cleanup();
680 }
681 }
682
683 record_utmp_only(pid, s->tty, s->pw->pw_name,
Damien Millerf3451a22002-02-05 12:40:46 +1100684 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000685 (struct sockaddr *)&from);
686}
687#endif
688
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000689/*
690 * This is called to fork and execute a command. If another command is
691 * to be forced, execute that instead.
692 */
693void
694do_exec(Session *s, const char *command)
695{
696 if (forced_command) {
697 original_command = command;
698 command = forced_command;
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000699 debug("Forced command '%.900s'", command);
700 }
701
702 if (s->ttyfd != -1)
703 do_exec_pty(s, command);
704 else
705 do_exec_no_pty(s, command);
706
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000707 original_command = NULL;
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000708}
709
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000710
Damien Miller942da032000-08-18 13:59:06 +1000711/* administrative, login(1)-like work */
712void
Damien Miller69b69aa2000-10-28 14:19:58 +1100713do_login(Session *s, const char *command)
Damien Miller942da032000-08-18 13:59:06 +1000714{
Damien Miller942da032000-08-18 13:59:06 +1000715 char *time_string;
Damien Miller942da032000-08-18 13:59:06 +1000716 socklen_t fromlen;
717 struct sockaddr_storage from;
Damien Miller942da032000-08-18 13:59:06 +1000718 struct passwd * pw = s->pw;
719 pid_t pid = getpid();
720
721 /*
722 * Get IP address of client. If the connection is not a socket, let
723 * the address be 0.0.0.0.
724 */
725 memset(&from, 0, sizeof(from));
726 if (packet_connection_is_on_socket()) {
727 fromlen = sizeof(from);
728 if (getpeername(packet_get_connection_in(),
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000729 (struct sockaddr *) & from, &fromlen) < 0) {
Damien Miller942da032000-08-18 13:59:06 +1000730 debug("getpeername: %.100s", strerror(errno));
731 fatal_cleanup();
732 }
733 }
734
735 /* Record that there was a login on that tty from the remote host. */
Ben Lindstrom2bf56e22002-04-02 20:32:46 +0000736 if (!use_privsep)
737 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
738 get_remote_name_or_ip(utmp_len,
739 options.verify_reverse_mapping),
740 (struct sockaddr *)&from);
Damien Miller942da032000-08-18 13:59:06 +1000741
Kevin Steves092f2ef2000-10-14 13:36:13 +0000742#ifdef USE_PAM
743 /*
744 * If password change is needed, do it now.
745 * This needs to occur before the ~/.hushlogin check.
746 */
Damien Miller646aa602001-02-15 11:51:32 +1100747 if (is_pam_password_change_required()) {
Kevin Steves092f2ef2000-10-14 13:36:13 +0000748 print_pam_messages();
749 do_pam_chauthtok();
750 }
751#endif
752
Damien Millercf205e82001-04-16 18:29:15 +1000753 if (check_quietlogin(s, command))
Damien Miller942da032000-08-18 13:59:06 +1000754 return;
755
756#ifdef USE_PAM
Damien Miller646aa602001-02-15 11:51:32 +1100757 if (!is_pam_password_change_required())
Kevin Steves092f2ef2000-10-14 13:36:13 +0000758 print_pam_messages();
Damien Miller942da032000-08-18 13:59:06 +1000759#endif /* USE_PAM */
760#ifdef WITH_AIXAUTHENTICATE
761 if (aixloginmsg && *aixloginmsg)
762 printf("%s\n", aixloginmsg);
763#endif /* WITH_AIXAUTHENTICATE */
764
Ben Lindstromc447fee2002-04-02 20:35:35 +0000765 if (options.print_lastlog && s->last_login_time != 0) {
766 time_string = ctime(&s->last_login_time);
Damien Miller942da032000-08-18 13:59:06 +1000767 if (strchr(time_string, '\n'))
768 *strchr(time_string, '\n') = 0;
Ben Lindstromc447fee2002-04-02 20:35:35 +0000769 if (strcmp(s->hostname, "") == 0)
Damien Miller942da032000-08-18 13:59:06 +1000770 printf("Last login: %s\r\n", time_string);
771 else
Ben Lindstromc447fee2002-04-02 20:35:35 +0000772 printf("Last login: %s from %s\r\n", time_string,
773 s->hostname);
Damien Miller942da032000-08-18 13:59:06 +1000774 }
Damien Millercf205e82001-04-16 18:29:15 +1000775
776 do_motd();
777}
778
779/*
780 * Display the message of the day.
781 */
782void
783do_motd(void)
784{
785 FILE *f;
786 char buf[256];
787
Damien Miller942da032000-08-18 13:59:06 +1000788 if (options.print_motd) {
Damien Millerad833b32000-08-23 10:46:23 +1000789#ifdef HAVE_LOGIN_CAP
790 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
791 "/etc/motd"), "r");
792#else
Damien Miller942da032000-08-18 13:59:06 +1000793 f = fopen("/etc/motd", "r");
Damien Millerad833b32000-08-23 10:46:23 +1000794#endif
Damien Miller942da032000-08-18 13:59:06 +1000795 if (f) {
796 while (fgets(buf, sizeof(buf), f))
797 fputs(buf, stdout);
798 fclose(f);
799 }
800 }
801}
802
Kevin Steves8f63caa2001-07-04 18:23:02 +0000803
804/*
805 * Check for quiet login, either .hushlogin or command given.
806 */
807int
808check_quietlogin(Session *s, const char *command)
809{
810 char buf[256];
811 struct passwd *pw = s->pw;
812 struct stat st;
813
814 /* Return 1 if .hushlogin exists or a command given. */
815 if (command != NULL)
816 return 1;
817 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
818#ifdef HAVE_LOGIN_CAP
819 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
820 return 1;
821#else
822 if (stat(buf, &st) >= 0)
823 return 1;
824#endif
825 return 0;
826}
827
Damien Millerb38eff82000-04-01 11:09:21 +1000828/*
829 * Sets the value of the given variable in the environment. If the variable
830 * already exists, its value is overriden.
831 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000832static void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000833child_set_env(char ***envp, u_int *envsizep, const char *name,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100834 const char *value)
Damien Millerb38eff82000-04-01 11:09:21 +1000835{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000836 u_int i, namelen;
Damien Millerb38eff82000-04-01 11:09:21 +1000837 char **env;
838
839 /*
840 * Find the slot where the value should be stored. If the variable
841 * already exists, we reuse the slot; otherwise we append a new slot
842 * at the end of the array, expanding if necessary.
843 */
844 env = *envp;
845 namelen = strlen(name);
846 for (i = 0; env[i]; i++)
847 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
848 break;
849 if (env[i]) {
850 /* Reuse the slot. */
851 xfree(env[i]);
852 } else {
853 /* New variable. Expand if necessary. */
854 if (i >= (*envsizep) - 1) {
Damien Millera0796ca2002-06-26 19:15:07 +1000855 if (*envsizep >= 1000)
856 fatal("child_set_env: too many env vars,"
857 " skipping: %.100s", name);
Damien Millerb38eff82000-04-01 11:09:21 +1000858 (*envsizep) += 50;
859 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
860 }
861 /* Need to set the NULL pointer at end of array beyond the new slot. */
862 env[i + 1] = NULL;
863 }
864
865 /* Allocate space and format the variable in the appropriate slot. */
866 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
867 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
868}
869
870/*
871 * Reads environment variables from the given file and adds/overrides them
872 * into the environment. If the file does not exist, this does nothing.
873 * Otherwise, it must consist of empty lines, comments (line starts with '#')
874 * and assignments of the form name=value. No other forms are allowed.
875 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000876static void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000877read_environment_file(char ***env, u_int *envsize,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100878 const char *filename)
Damien Millerb38eff82000-04-01 11:09:21 +1000879{
880 FILE *f;
881 char buf[4096];
882 char *cp, *value;
Damien Miller990070a2002-06-26 23:51:06 +1000883 u_int lineno = 0;
Damien Millerb38eff82000-04-01 11:09:21 +1000884
885 f = fopen(filename, "r");
886 if (!f)
887 return;
888
889 while (fgets(buf, sizeof(buf), f)) {
Damien Miller990070a2002-06-26 23:51:06 +1000890 if (++lineno > 1000)
891 fatal("Too many lines in environment file %s", filename);
Damien Millerb38eff82000-04-01 11:09:21 +1000892 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
893 ;
894 if (!*cp || *cp == '#' || *cp == '\n')
895 continue;
896 if (strchr(cp, '\n'))
897 *strchr(cp, '\n') = '\0';
898 value = strchr(cp, '=');
899 if (value == NULL) {
Damien Miller990070a2002-06-26 23:51:06 +1000900 fprintf(stderr, "Bad line %u in %.100s\n", lineno,
901 filename);
Damien Millerb38eff82000-04-01 11:09:21 +1000902 continue;
903 }
Damien Millerb1715dc2000-05-30 13:44:51 +1000904 /*
905 * Replace the equals sign by nul, and advance value to
906 * the value string.
907 */
Damien Millerb38eff82000-04-01 11:09:21 +1000908 *value = '\0';
909 value++;
910 child_set_env(env, envsize, cp, value);
911 }
912 fclose(f);
913}
914
Damien Millerbb9ffc12002-01-08 10:59:32 +1100915void copy_environment(char **source, char ***env, u_int *envsize)
Damien Millerb38eff82000-04-01 11:09:21 +1000916{
Damien Millerbb9ffc12002-01-08 10:59:32 +1100917 char *var_name, *var_val;
Damien Millerb38eff82000-04-01 11:09:21 +1000918 int i;
919
Damien Millerbb9ffc12002-01-08 10:59:32 +1100920 if (source == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +1000921 return;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000922
Damien Millerbb9ffc12002-01-08 10:59:32 +1100923 for(i = 0; source[i] != NULL; i++) {
924 var_name = xstrdup(source[i]);
925 if ((var_val = strstr(var_name, "=")) == NULL) {
926 xfree(var_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000927 continue;
Damien Millerb38eff82000-04-01 11:09:21 +1000928 }
Damien Millerbb9ffc12002-01-08 10:59:32 +1100929 *var_val++ = '\0';
930
931 debug3("Copy environment: %s=%s", var_name, var_val);
932 child_set_env(env, envsize, var_name, var_val);
933
934 xfree(var_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000935 }
936}
Damien Millercb5e44a2000-09-29 12:12:36 +1100937
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000938static char **
939do_setup_env(Session *s, const char *shell)
Damien Millerb38eff82000-04-01 11:09:21 +1000940{
Damien Millerb38eff82000-04-01 11:09:21 +1000941 char buf[256];
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000942 u_int i, envsize;
Damien Millerb38eff82000-04-01 11:09:21 +1000943 char **env;
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000944 struct passwd *pw = s->pw;
Damien Millerb38eff82000-04-01 11:09:21 +1000945
Damien Millerb38eff82000-04-01 11:09:21 +1000946 /* Initialize the environment. */
947 envsize = 100;
948 env = xmalloc(envsize * sizeof(char *));
949 env[0] = NULL;
950
Damien Millerbac2d8a2000-09-05 16:13:06 +1100951#ifdef HAVE_CYGWIN
952 /*
953 * The Windows environment contains some setting which are
954 * important for a running system. They must not be dropped.
955 */
Damien Millerbb9ffc12002-01-08 10:59:32 +1100956 copy_environment(environ, &env, &envsize);
Damien Millerbac2d8a2000-09-05 16:13:06 +1100957#endif
958
Damien Millerb38eff82000-04-01 11:09:21 +1000959 if (!options.use_login) {
960 /* Set basic environment. */
961 child_set_env(&env, &envsize, "USER", pw->pw_name);
962 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
963 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
Damien Millerad833b32000-08-23 10:46:23 +1000964#ifdef HAVE_LOGIN_CAP
Ben Lindstromb9051ec2002-07-23 21:11:09 +0000965 if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
966 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
967 else
968 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
Damien Millercb5e44a2000-09-29 12:12:36 +1100969#else /* HAVE_LOGIN_CAP */
970# ifndef HAVE_CYGWIN
Damien Millerbac2d8a2000-09-05 16:13:06 +1100971 /*
972 * There's no standard path on Windows. The path contains
973 * important components pointing to the system directories,
974 * needed for loading shared libraries. So the path better
975 * remains intact here.
976 */
Damien Millera18bbd32002-05-13 10:48:57 +1000977# ifdef SUPERUSER_PATH
978 child_set_env(&env, &envsize, "PATH",
979 s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH);
980# else
Damien Millerb38eff82000-04-01 11:09:21 +1000981 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
Damien Millera18bbd32002-05-13 10:48:57 +1000982# endif /* SUPERUSER_PATH */
Damien Millercb5e44a2000-09-29 12:12:36 +1100983# endif /* HAVE_CYGWIN */
984#endif /* HAVE_LOGIN_CAP */
Damien Millerb38eff82000-04-01 11:09:21 +1000985
986 snprintf(buf, sizeof buf, "%.200s/%.50s",
987 _PATH_MAILDIR, pw->pw_name);
988 child_set_env(&env, &envsize, "MAIL", buf);
989
990 /* Normal systems set SHELL by default. */
991 child_set_env(&env, &envsize, "SHELL", shell);
992 }
993 if (getenv("TZ"))
994 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
995
996 /* Set custom environment options from RSA authentication. */
Ben Lindstrom38b951c2001-12-06 17:47:47 +0000997 if (!options.use_login) {
998 while (custom_environment) {
999 struct envstring *ce = custom_environment;
Ben Lindstrom5a9d0ea2002-07-04 00:12:53 +00001000 char *str = ce->s;
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001001
Ben Lindstrom5a9d0ea2002-07-04 00:12:53 +00001002 for (i = 0; str[i] != '=' && str[i]; i++)
Ben Lindstrom38b951c2001-12-06 17:47:47 +00001003 ;
Ben Lindstrom5a9d0ea2002-07-04 00:12:53 +00001004 if (str[i] == '=') {
1005 str[i] = 0;
1006 child_set_env(&env, &envsize, str, str + i + 1);
Ben Lindstrom38b951c2001-12-06 17:47:47 +00001007 }
1008 custom_environment = ce->next;
1009 xfree(ce->s);
1010 xfree(ce);
Damien Millerb38eff82000-04-01 11:09:21 +10001011 }
Damien Millerb38eff82000-04-01 11:09:21 +10001012 }
1013
1014 snprintf(buf, sizeof buf, "%.50s %d %d",
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001015 get_remote_ipaddr(), get_remote_port(), get_local_port());
Damien Millerb38eff82000-04-01 11:09:21 +10001016 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1017
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001018 if (s->ttyfd != -1)
1019 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1020 if (s->term)
1021 child_set_env(&env, &envsize, "TERM", s->term);
1022 if (s->display)
1023 child_set_env(&env, &envsize, "DISPLAY", s->display);
Damien Miller7b28dc52000-09-05 13:34:53 +11001024 if (original_command)
1025 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1026 original_command);
Damien Millerb38eff82000-04-01 11:09:21 +10001027
1028#ifdef _AIX
Ben Lindstrom839ac4f2002-02-24 20:42:46 +00001029 {
1030 char *cp;
1031
1032 if ((cp = getenv("AUTHSTATE")) != NULL)
1033 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1034 if ((cp = getenv("KRB5CCNAME")) != NULL)
1035 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1036 read_environment_file(&env, &envsize, "/etc/environment");
1037 }
Damien Millerb38eff82000-04-01 11:09:21 +10001038#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001039#ifdef KRB4
Ben Lindstromec95ed92001-07-04 04:21:14 +00001040 if (s->authctxt->krb4_ticket_file)
1041 child_set_env(&env, &envsize, "KRBTKFILE",
1042 s->authctxt->krb4_ticket_file);
1043#endif
1044#ifdef KRB5
1045 if (s->authctxt->krb5_ticket_file)
1046 child_set_env(&env, &envsize, "KRB5CCNAME",
1047 s->authctxt->krb5_ticket_file);
1048#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001049#ifdef USE_PAM
Kevin Steves38b050a2002-07-23 00:44:07 +00001050 /*
1051 * Pull in any environment variables that may have
1052 * been set by PAM.
1053 */
1054 {
1055 char **p;
1056
1057 p = fetch_pam_environment();
1058 copy_environment(p, &env, &envsize);
1059 free_pam_environment(p);
1060 }
Damien Millerb38eff82000-04-01 11:09:21 +10001061#endif /* USE_PAM */
1062
Ben Lindstrom8bb6f362002-06-11 15:59:02 +00001063 if (auth_sock_name != NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001064 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
Ben Lindstrom8bb6f362002-06-11 15:59:02 +00001065 auth_sock_name);
Damien Millerb38eff82000-04-01 11:09:21 +10001066
1067 /* read $HOME/.ssh/environment. */
Ben Lindstrom5d860f02002-08-01 01:28:38 +00001068 if (options.permit_user_env && !options.use_login) {
Damien Millerb1715dc2000-05-30 13:44:51 +10001069 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1070 pw->pw_dir);
Damien Millerb38eff82000-04-01 11:09:21 +10001071 read_environment_file(&env, &envsize, buf);
1072 }
1073 if (debug_flag) {
1074 /* dump the environment */
1075 fprintf(stderr, "Environment:\n");
1076 for (i = 0; env[i]; i++)
1077 fprintf(stderr, " %.200s\n", env[i]);
1078 }
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001079 return env;
1080}
1081
1082/*
1083 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1084 * first in this order).
1085 */
1086static void
1087do_rc_files(Session *s, const char *shell)
1088{
1089 FILE *f = NULL;
1090 char cmd[1024];
1091 int do_xauth;
1092 struct stat st;
1093
1094 do_xauth =
1095 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1096
1097 /* ignore _PATH_SSH_USER_RC for subsystems */
1098 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1099 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1100 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1101 if (debug_flag)
1102 fprintf(stderr, "Running %s\n", cmd);
1103 f = popen(cmd, "w");
1104 if (f) {
1105 if (do_xauth)
1106 fprintf(f, "%s %s\n", s->auth_proto,
1107 s->auth_data);
1108 pclose(f);
1109 } else
1110 fprintf(stderr, "Could not run %s\n",
1111 _PATH_SSH_USER_RC);
1112 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1113 if (debug_flag)
1114 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1115 _PATH_SSH_SYSTEM_RC);
1116 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1117 if (f) {
1118 if (do_xauth)
1119 fprintf(f, "%s %s\n", s->auth_proto,
1120 s->auth_data);
1121 pclose(f);
1122 } else
1123 fprintf(stderr, "Could not run %s\n",
1124 _PATH_SSH_SYSTEM_RC);
1125 } else if (do_xauth && options.xauth_location != NULL) {
1126 /* Add authority data to .Xauthority if appropriate. */
1127 if (debug_flag) {
1128 fprintf(stderr,
Ben Lindstromfac77692002-06-06 19:49:54 +00001129 "Running %.500s add "
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001130 "%.100s %.100s %.100s\n",
1131 options.xauth_location, s->auth_display,
1132 s->auth_proto, s->auth_data);
1133 }
1134 snprintf(cmd, sizeof cmd, "%s -q -",
1135 options.xauth_location);
1136 f = popen(cmd, "w");
1137 if (f) {
1138 fprintf(f, "add %s %s %s\n",
1139 s->auth_display, s->auth_proto,
1140 s->auth_data);
1141 pclose(f);
1142 } else {
1143 fprintf(stderr, "Could not run %s\n",
1144 cmd);
1145 }
1146 }
1147}
1148
1149static void
1150do_nologin(struct passwd *pw)
1151{
1152 FILE *f = NULL;
1153 char buf[1024];
1154
1155#ifdef HAVE_LOGIN_CAP
1156 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1157 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1158 _PATH_NOLOGIN), "r");
1159#else
1160 if (pw->pw_uid)
1161 f = fopen(_PATH_NOLOGIN, "r");
1162#endif
1163 if (f) {
1164 /* /etc/nologin exists. Print its contents and exit. */
1165 while (fgets(buf, sizeof(buf), f))
1166 fputs(buf, stderr);
1167 fclose(f);
1168 exit(254);
1169 }
1170}
1171
1172/* Set login name, uid, gid, and groups. */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001173void
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001174do_setusercontext(struct passwd *pw)
1175{
1176#ifdef HAVE_CYGWIN
Ben Lindstrom3107efc2002-02-21 15:37:02 +00001177 if (is_winnt) {
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001178#else /* HAVE_CYGWIN */
1179 if (getuid() == 0 || geteuid() == 0) {
1180#endif /* HAVE_CYGWIN */
Ben Lindstromf0bfa832002-06-21 00:01:18 +00001181#ifdef HAVE_SETPCRED
1182 setpcred(pw->pw_name);
1183#endif /* HAVE_SETPCRED */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001184#ifdef HAVE_LOGIN_CAP
Ben Lindstrom938b8282002-07-15 17:58:34 +00001185# ifdef __bsdi__
Damien Millerf18cd162002-06-26 19:12:59 +10001186 setpgid(0, 0);
Ben Lindstrom938b8282002-07-15 17:58:34 +00001187# endif
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001188 if (setusercontext(lc, pw, pw->pw_uid,
1189 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1190 perror("unable to set user context");
1191 exit(1);
1192 }
1193#else
1194# if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1195 /* Sets login uid for accounting */
1196 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1197 error("setluid: %s", strerror(errno));
1198# endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1199
1200 if (setlogin(pw->pw_name) < 0)
1201 error("setlogin failed: %s", strerror(errno));
1202 if (setgid(pw->pw_gid) < 0) {
1203 perror("setgid");
1204 exit(1);
1205 }
1206 /* Initialize the group list. */
1207 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1208 perror("initgroups");
1209 exit(1);
1210 }
1211 endgrent();
1212# ifdef USE_PAM
1213 /*
1214 * PAM credentials may take the form of supplementary groups.
1215 * These will have been wiped by the above initgroups() call.
1216 * Reestablish them here.
1217 */
1218 do_pam_setcred(0);
1219# endif /* USE_PAM */
1220# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1221 irix_setusercontext(pw);
1222# endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
Ben Lindstromb129be62002-06-25 17:12:26 +00001223# ifdef _AIX
Ben Lindstrom51b24882002-07-04 03:08:40 +00001224 aix_usrinfo(pw);
Ben Lindstromb129be62002-06-25 17:12:26 +00001225# endif /* _AIX */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001226 /* Permanently switch to the desired uid. */
1227 permanently_set_uid(pw);
1228#endif
1229 }
1230 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1231 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1232}
1233
Ben Lindstrom08105192002-03-22 02:50:06 +00001234static void
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001235launch_login(struct passwd *pw, const char *hostname)
1236{
1237 /* Launch login(1). */
1238
Ben Lindstrom378a4172002-06-07 14:49:56 +00001239 execl(LOGIN_PROGRAM, "login", "-h", hostname,
Kevin Stevesb4799a32002-03-24 23:19:54 +00001240#ifdef xxxLOGIN_NEEDS_TERM
Ben Lindstrom5a6abda2002-06-09 19:41:48 +00001241 (s->term ? s->term : "unknown"),
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001242#endif /* LOGIN_NEEDS_TERM */
Kevin Steves5feaaef2002-04-23 20:45:55 +00001243#ifdef LOGIN_NO_ENDOPT
1244 "-p", "-f", pw->pw_name, (char *)NULL);
1245#else
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001246 "-p", "-f", "--", pw->pw_name, (char *)NULL);
Kevin Steves5feaaef2002-04-23 20:45:55 +00001247#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001248
1249 /* Login couldn't be executed, die. */
1250
1251 perror("login");
1252 exit(1);
1253}
1254
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001255/*
1256 * Performs common processing for the child, such as setting up the
1257 * environment, closing extra file descriptors, setting the user and group
1258 * ids, and executing the command or shell.
1259 */
1260void
1261do_child(Session *s, const char *command)
1262{
1263 extern char **environ;
1264 char **env;
1265 char *argv[10];
1266 const char *shell, *shell0, *hostname = NULL;
1267 struct passwd *pw = s->pw;
1268 u_int i;
1269
1270 /* remove hostkey from the child's memory */
1271 destroy_sensitive_data();
1272
1273 /* login(1) is only called if we execute the login shell */
1274 if (options.use_login && command != NULL)
1275 options.use_login = 0;
1276
1277 /*
1278 * Login(1) does this as well, and it needs uid 0 for the "-h"
1279 * switch, so we let login(1) to this for us.
1280 */
1281 if (!options.use_login) {
1282#ifdef HAVE_OSF_SIA
1283 session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
1284 if (!check_quietlogin(s, command))
1285 do_motd();
1286#else /* HAVE_OSF_SIA */
1287 do_nologin(pw);
1288 do_setusercontext(pw);
1289#endif /* HAVE_OSF_SIA */
1290 }
1291
1292 /*
1293 * Get the shell from the password data. An empty shell field is
1294 * legal, and means /bin/sh.
1295 */
1296 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1297#ifdef HAVE_LOGIN_CAP
1298 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1299#endif
1300
1301 env = do_setup_env(s, shell);
1302
Damien Millerad833b32000-08-23 10:46:23 +10001303 /* we have to stash the hostname before we close our socket. */
1304 if (options.use_login)
Ben Lindstromf15a3862001-04-05 23:32:17 +00001305 hostname = get_remote_name_or_ip(utmp_len,
Damien Millerc5d86352002-02-05 12:13:41 +11001306 options.verify_reverse_mapping);
Damien Millerb38eff82000-04-01 11:09:21 +10001307 /*
1308 * Close the connection descriptors; note that this is the child, and
1309 * the server will still have the socket open, and it is important
1310 * that we do not shutdown it. Note that the descriptors cannot be
1311 * closed before building the environment, as we call
1312 * get_remote_ipaddr there.
1313 */
1314 if (packet_get_connection_in() == packet_get_connection_out())
1315 close(packet_get_connection_in());
1316 else {
1317 close(packet_get_connection_in());
1318 close(packet_get_connection_out());
1319 }
1320 /*
1321 * Close all descriptors related to channels. They will still remain
1322 * open in the parent.
1323 */
1324 /* XXX better use close-on-exec? -markus */
1325 channel_close_all();
1326
1327 /*
1328 * Close any extra file descriptors. Note that there may still be
1329 * descriptors left by system functions. They will be closed later.
1330 */
1331 endpwent();
1332
1333 /*
1334 * Close any extra open file descriptors so that we don\'t have them
1335 * hanging around in clients. Note that we want to do this after
1336 * initgroups, because at least on Solaris 2.3 it leaves file
1337 * descriptors open.
1338 */
1339 for (i = 3; i < 64; i++)
1340 close(i);
1341
Damien Millerb38eff82000-04-01 11:09:21 +10001342 /*
Damien Miller05eda432002-02-10 18:32:28 +11001343 * Must take new environment into use so that .ssh/rc,
1344 * /etc/ssh/sshrc and xauth are run in the proper environment.
Damien Millerb38eff82000-04-01 11:09:21 +10001345 */
1346 environ = env;
1347
Ben Lindstrom37e41c92001-09-16 22:17:15 +00001348#ifdef AFS
1349 /* Try to get AFS tokens for the local cell. */
1350 if (k_hasafs()) {
1351 char cell[64];
Damien Miller9f0f5c62001-12-21 14:45:46 +11001352
Ben Lindstrom37e41c92001-09-16 22:17:15 +00001353 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1354 krb_afslog(cell, 0);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001355
Ben Lindstrom37e41c92001-09-16 22:17:15 +00001356 krb_afslog(0, 0);
1357 }
1358#endif /* AFS */
1359
Damien Miller139d4cd2001-10-10 15:07:44 +10001360 /* Change current directory to the user\'s home directory. */
1361 if (chdir(pw->pw_dir) < 0) {
1362 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1363 pw->pw_dir, strerror(errno));
1364#ifdef HAVE_LOGIN_CAP
1365 if (login_getcapbool(lc, "requirehome", 0))
1366 exit(1);
1367#endif
1368 }
1369
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001370 if (!options.use_login)
1371 do_rc_files(s, shell);
Ben Lindstromde71cda2001-03-24 00:43:26 +00001372
1373 /* restore SIGPIPE for child */
1374 signal(SIGPIPE, SIG_DFL);
1375
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001376 if (options.use_login) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001377 launch_login(pw, hostname);
1378 /* NEVERREACHED */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001379 }
1380
1381 /* Get the last component of the shell name. */
1382 if ((shell0 = strrchr(shell, '/')) != NULL)
1383 shell0++;
1384 else
1385 shell0 = shell;
1386
Damien Millerb38eff82000-04-01 11:09:21 +10001387 /*
1388 * If we have no command, execute the shell. In this case, the shell
1389 * name to be passed in argv[0] is preceded by '-' to indicate that
1390 * this is a login shell.
1391 */
1392 if (!command) {
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001393 char argv0[256];
Damien Millerb38eff82000-04-01 11:09:21 +10001394
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001395 /* Start the shell. Set initial character to '-'. */
1396 argv0[0] = '-';
Damien Millerb38eff82000-04-01 11:09:21 +10001397
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001398 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1399 >= sizeof(argv0) - 1) {
1400 errno = EINVAL;
Damien Millerb38eff82000-04-01 11:09:21 +10001401 perror(shell);
1402 exit(1);
Damien Millerb38eff82000-04-01 11:09:21 +10001403 }
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001404
1405 /* Execute the shell. */
1406 argv[0] = argv0;
1407 argv[1] = NULL;
1408 execve(shell, argv, env);
1409
1410 /* Executing the shell failed. */
1411 perror(shell);
1412 exit(1);
Damien Millerb38eff82000-04-01 11:09:21 +10001413 }
1414 /*
1415 * Execute the command using the user's shell. This uses the -c
1416 * option to execute the command.
1417 */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001418 argv[0] = (char *) shell0;
Damien Millerb38eff82000-04-01 11:09:21 +10001419 argv[1] = "-c";
1420 argv[2] = (char *) command;
1421 argv[3] = NULL;
1422 execve(shell, argv, env);
1423 perror(shell);
1424 exit(1);
1425}
1426
1427Session *
1428session_new(void)
1429{
1430 int i;
1431 static int did_init = 0;
1432 if (!did_init) {
1433 debug("session_new: init");
Damien Miller9f0f5c62001-12-21 14:45:46 +11001434 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001435 sessions[i].used = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001436 }
1437 did_init = 1;
1438 }
Damien Miller9f0f5c62001-12-21 14:45:46 +11001439 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001440 Session *s = &sessions[i];
1441 if (! s->used) {
Ben Lindstrom60294322001-03-26 05:38:25 +00001442 memset(s, 0, sizeof(*s));
Damien Millerb38eff82000-04-01 11:09:21 +10001443 s->chanid = -1;
1444 s->ptyfd = -1;
1445 s->ttyfd = -1;
Damien Millerb38eff82000-04-01 11:09:21 +10001446 s->used = 1;
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001447 s->self = i;
Damien Miller15b29522000-10-14 12:33:48 +11001448 debug("session_new: session %d", i);
Damien Millerb38eff82000-04-01 11:09:21 +10001449 return s;
1450 }
1451 }
1452 return NULL;
1453}
1454
Ben Lindstrombba81212001-06-25 05:01:22 +00001455static void
Damien Millerb38eff82000-04-01 11:09:21 +10001456session_dump(void)
1457{
1458 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001459 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001460 Session *s = &sessions[i];
Ben Lindstromce0f6342002-06-11 16:42:49 +00001461 debug("dump: used %d session %d %p channel %d pid %ld",
Damien Millerb38eff82000-04-01 11:09:21 +10001462 s->used,
1463 s->self,
1464 s,
1465 s->chanid,
Ben Lindstromce0f6342002-06-11 16:42:49 +00001466 (long)s->pid);
Damien Millerb38eff82000-04-01 11:09:21 +10001467 }
1468}
1469
Damien Millerefb4afe2000-04-12 18:45:05 +10001470int
Ben Lindstrombddd5512001-07-04 04:53:53 +00001471session_open(Authctxt *authctxt, int chanid)
Damien Millerefb4afe2000-04-12 18:45:05 +10001472{
1473 Session *s = session_new();
1474 debug("session_open: channel %d", chanid);
1475 if (s == NULL) {
1476 error("no more sessions");
1477 return 0;
1478 }
Ben Lindstrombddd5512001-07-04 04:53:53 +00001479 s->authctxt = authctxt;
1480 s->pw = authctxt->pw;
Damien Millerefb4afe2000-04-12 18:45:05 +10001481 if (s->pw == NULL)
Kevin Steves43cdef32001-02-11 14:12:08 +00001482 fatal("no user for session %d", s->self);
Damien Millerbd483e72000-04-30 10:00:53 +10001483 debug("session_open: session %d: link with channel %d", s->self, chanid);
1484 s->chanid = chanid;
Damien Millerefb4afe2000-04-12 18:45:05 +10001485 return 1;
1486}
1487
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001488Session *
1489session_by_tty(char *tty)
1490{
1491 int i;
1492 for (i = 0; i < MAX_SESSIONS; i++) {
1493 Session *s = &sessions[i];
1494 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1495 debug("session_by_tty: session %d tty %s", i, tty);
1496 return s;
1497 }
1498 }
1499 debug("session_by_tty: unknown tty %.100s", tty);
1500 session_dump();
1501 return NULL;
1502}
1503
Ben Lindstrombba81212001-06-25 05:01:22 +00001504static Session *
Damien Millerefb4afe2000-04-12 18:45:05 +10001505session_by_channel(int id)
1506{
1507 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001508 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerefb4afe2000-04-12 18:45:05 +10001509 Session *s = &sessions[i];
1510 if (s->used && s->chanid == id) {
1511 debug("session_by_channel: session %d channel %d", i, id);
1512 return s;
1513 }
1514 }
1515 debug("session_by_channel: unknown channel %d", id);
1516 session_dump();
1517 return NULL;
1518}
1519
Ben Lindstrombba81212001-06-25 05:01:22 +00001520static Session *
Damien Millerefb4afe2000-04-12 18:45:05 +10001521session_by_pid(pid_t pid)
1522{
1523 int i;
Ben Lindstromce0f6342002-06-11 16:42:49 +00001524 debug("session_by_pid: pid %ld", (long)pid);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001525 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerefb4afe2000-04-12 18:45:05 +10001526 Session *s = &sessions[i];
1527 if (s->used && s->pid == pid)
1528 return s;
1529 }
Ben Lindstromce0f6342002-06-11 16:42:49 +00001530 error("session_by_pid: unknown pid %ld", (long)pid);
Damien Millerefb4afe2000-04-12 18:45:05 +10001531 session_dump();
1532 return NULL;
1533}
1534
Ben Lindstrombba81212001-06-25 05:01:22 +00001535static int
Damien Millerefb4afe2000-04-12 18:45:05 +10001536session_window_change_req(Session *s)
1537{
1538 s->col = packet_get_int();
1539 s->row = packet_get_int();
1540 s->xpixel = packet_get_int();
1541 s->ypixel = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001542 packet_check_eom();
Damien Millerefb4afe2000-04-12 18:45:05 +10001543 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1544 return 1;
1545}
1546
Ben Lindstrombba81212001-06-25 05:01:22 +00001547static int
Damien Millerefb4afe2000-04-12 18:45:05 +10001548session_pty_req(Session *s)
1549{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001550 u_int len;
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001551 int n_bytes;
Ben Lindstrom6328ab32002-03-22 02:54:23 +00001552
Ben Lindstrom49c12602001-06-13 04:37:36 +00001553 if (no_pty_flag) {
1554 debug("Allocating a pty not permitted for this authentication.");
Damien Millerf6d9e222000-06-18 14:50:44 +10001555 return 0;
Ben Lindstrom49c12602001-06-13 04:37:36 +00001556 }
1557 if (s->ttyfd != -1) {
1558 packet_disconnect("Protocol error: you already have a pty.");
Damien Miller4af51302000-04-16 11:18:38 +10001559 return 0;
Ben Lindstrom49c12602001-06-13 04:37:36 +00001560 }
Ben Lindstromc447fee2002-04-02 20:35:35 +00001561 /* Get the time and hostname when the user last logged in. */
1562 if (options.print_lastlog) {
1563 s->hostname[0] = '\0';
1564 s->last_login_time = get_last_login_time(s->pw->pw_uid,
1565 s->pw->pw_name, s->hostname, sizeof(s->hostname));
1566 }
Ben Lindstrom49c12602001-06-13 04:37:36 +00001567
Damien Millerefb4afe2000-04-12 18:45:05 +10001568 s->term = packet_get_string(&len);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001569
1570 if (compat20) {
1571 s->col = packet_get_int();
1572 s->row = packet_get_int();
1573 } else {
1574 s->row = packet_get_int();
1575 s->col = packet_get_int();
1576 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001577 s->xpixel = packet_get_int();
1578 s->ypixel = packet_get_int();
1579
1580 if (strcmp(s->term, "") == 0) {
1581 xfree(s->term);
1582 s->term = NULL;
1583 }
Ben Lindstrom49c12602001-06-13 04:37:36 +00001584
Damien Millerefb4afe2000-04-12 18:45:05 +10001585 /* Allocate a pty and open it. */
Ben Lindstrom49c12602001-06-13 04:37:36 +00001586 debug("Allocating pty.");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001587 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
Ben Lindstrom49c12602001-06-13 04:37:36 +00001588 if (s->term)
1589 xfree(s->term);
Damien Millerefb4afe2000-04-12 18:45:05 +10001590 s->term = NULL;
1591 s->ptyfd = -1;
1592 s->ttyfd = -1;
1593 error("session_pty_req: session %d alloc failed", s->self);
Damien Miller4af51302000-04-16 11:18:38 +10001594 return 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001595 }
1596 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001597
1598 /* for SSH1 the tty modes length is not given */
1599 if (!compat20)
1600 n_bytes = packet_remaining();
1601 tty_parse_modes(s->ttyfd, &n_bytes);
1602
Damien Millerefb4afe2000-04-12 18:45:05 +10001603 /*
1604 * Add a cleanup function to clear the utmp entry and record logout
1605 * time in case we call fatal() (e.g., the connection gets closed).
1606 */
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001607 fatal_add_cleanup(session_pty_cleanup, (void *)s);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001608 if (!use_privsep)
1609 pty_setowner(s->pw, s->tty);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001610
1611 /* Set window size from the packet. */
Damien Millerefb4afe2000-04-12 18:45:05 +10001612 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1613
Damien Miller48b03fc2002-01-22 23:11:40 +11001614 packet_check_eom();
Damien Millere247cc42000-05-07 12:03:14 +10001615 session_proctitle(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001616 return 1;
1617}
1618
Ben Lindstrombba81212001-06-25 05:01:22 +00001619static int
Damien Millerbd483e72000-04-30 10:00:53 +10001620session_subsystem_req(Session *s)
1621{
Damien Millerae452462001-10-10 15:08:06 +10001622 struct stat st;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001623 u_int len;
Damien Millerbd483e72000-04-30 10:00:53 +10001624 int success = 0;
Damien Millerae452462001-10-10 15:08:06 +10001625 char *cmd, *subsys = packet_get_string(&len);
Damien Millerf6d9e222000-06-18 14:50:44 +10001626 int i;
Damien Millerbd483e72000-04-30 10:00:53 +10001627
Damien Miller48b03fc2002-01-22 23:11:40 +11001628 packet_check_eom();
Damien Millerbaa08702002-02-05 12:14:10 +11001629 log("subsystem request for %.100s", subsys);
Damien Millerbd483e72000-04-30 10:00:53 +10001630
Damien Millerf6d9e222000-06-18 14:50:44 +10001631 for (i = 0; i < options.num_subsystems; i++) {
Damien Millerae452462001-10-10 15:08:06 +10001632 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1633 cmd = options.subsystem_command[i];
1634 if (stat(cmd, &st) < 0) {
1635 error("subsystem: cannot stat %s: %s", cmd,
1636 strerror(errno));
1637 break;
1638 }
1639 debug("subsystem: exec() %s", cmd);
Ben Lindstromfc9b07d2001-03-22 01:27:23 +00001640 s->is_subsystem = 1;
Damien Millerae452462001-10-10 15:08:06 +10001641 do_exec(s, cmd);
Damien Millerf6d9e222000-06-18 14:50:44 +10001642 success = 1;
Damien Miller5fab4b92002-02-05 12:15:07 +11001643 break;
Damien Millerf6d9e222000-06-18 14:50:44 +10001644 }
1645 }
1646
1647 if (!success)
Damien Millerbaa08702002-02-05 12:14:10 +11001648 log("subsystem request for %.100s failed, subsystem not found",
Damien Millerae452462001-10-10 15:08:06 +10001649 subsys);
Damien Millerf6d9e222000-06-18 14:50:44 +10001650
Damien Millerbd483e72000-04-30 10:00:53 +10001651 xfree(subsys);
1652 return success;
1653}
1654
Ben Lindstrombba81212001-06-25 05:01:22 +00001655static int
Damien Millerbd483e72000-04-30 10:00:53 +10001656session_x11_req(Session *s)
1657{
Ben Lindstrom768176b2001-06-09 01:29:12 +00001658 int success;
Damien Millerbd483e72000-04-30 10:00:53 +10001659
1660 s->single_connection = packet_get_char();
1661 s->auth_proto = packet_get_string(NULL);
1662 s->auth_data = packet_get_string(NULL);
1663 s->screen = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001664 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10001665
Ben Lindstrom768176b2001-06-09 01:29:12 +00001666 success = session_setup_x11fwd(s);
1667 if (!success) {
Damien Millerbd483e72000-04-30 10:00:53 +10001668 xfree(s->auth_proto);
1669 xfree(s->auth_data);
Ben Lindstrom88259fb2001-06-12 00:21:34 +00001670 s->auth_proto = NULL;
1671 s->auth_data = NULL;
Damien Millerbd483e72000-04-30 10:00:53 +10001672 }
Ben Lindstrom768176b2001-06-09 01:29:12 +00001673 return success;
Damien Millerbd483e72000-04-30 10:00:53 +10001674}
1675
Ben Lindstrombba81212001-06-25 05:01:22 +00001676static int
Damien Millerf6d9e222000-06-18 14:50:44 +10001677session_shell_req(Session *s)
1678{
Damien Miller48b03fc2002-01-22 23:11:40 +11001679 packet_check_eom();
Ben Lindstromc85ab8a2001-06-21 03:13:10 +00001680 do_exec(s, NULL);
Damien Millerf6d9e222000-06-18 14:50:44 +10001681 return 1;
1682}
1683
Ben Lindstrombba81212001-06-25 05:01:22 +00001684static int
Damien Millerf6d9e222000-06-18 14:50:44 +10001685session_exec_req(Session *s)
1686{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001687 u_int len;
Damien Millerf6d9e222000-06-18 14:50:44 +10001688 char *command = packet_get_string(&len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001689 packet_check_eom();
Ben Lindstromc85ab8a2001-06-21 03:13:10 +00001690 do_exec(s, command);
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +00001691 xfree(command);
Damien Millerf6d9e222000-06-18 14:50:44 +10001692 return 1;
1693}
1694
Ben Lindstrombba81212001-06-25 05:01:22 +00001695static int
Damien Miller0bc1bd82000-11-13 22:57:25 +11001696session_auth_agent_req(Session *s)
1697{
1698 static int called = 0;
Damien Miller48b03fc2002-01-22 23:11:40 +11001699 packet_check_eom();
Ben Lindstrom14920292000-11-21 21:24:55 +00001700 if (no_agent_forwarding_flag) {
1701 debug("session_auth_agent_req: no_agent_forwarding_flag");
1702 return 0;
1703 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001704 if (called) {
1705 return 0;
1706 } else {
1707 called = 1;
1708 return auth_input_request_forwarding(s->pw);
1709 }
1710}
1711
Damien Millerc7ef63d2002-02-05 12:21:42 +11001712int
1713session_input_channel_req(Channel *c, const char *rtype)
Damien Millerefb4afe2000-04-12 18:45:05 +10001714{
Damien Millerefb4afe2000-04-12 18:45:05 +10001715 int success = 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001716 Session *s;
Damien Millerefb4afe2000-04-12 18:45:05 +10001717
Damien Millerc7ef63d2002-02-05 12:21:42 +11001718 if ((s = session_by_channel(c->self)) == NULL) {
1719 log("session_input_channel_req: no session %d req %.100s",
1720 c->self, rtype);
1721 return 0;
1722 }
1723 debug("session_input_channel_req: session %d req %s", s->self, rtype);
Damien Millerefb4afe2000-04-12 18:45:05 +10001724
1725 /*
Ben Lindstromfc9b07d2001-03-22 01:27:23 +00001726 * a session is in LARVAL state until a shell, a command
1727 * or a subsystem is executed
Damien Millerefb4afe2000-04-12 18:45:05 +10001728 */
1729 if (c->type == SSH_CHANNEL_LARVAL) {
1730 if (strcmp(rtype, "shell") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10001731 success = session_shell_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001732 } else if (strcmp(rtype, "exec") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10001733 success = session_exec_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001734 } else if (strcmp(rtype, "pty-req") == 0) {
Damien Miller5f056372000-04-16 12:31:48 +10001735 success = session_pty_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10001736 } else if (strcmp(rtype, "x11-req") == 0) {
1737 success = session_x11_req(s);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001738 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1739 success = session_auth_agent_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10001740 } else if (strcmp(rtype, "subsystem") == 0) {
1741 success = session_subsystem_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001742 }
1743 }
1744 if (strcmp(rtype, "window-change") == 0) {
1745 success = session_window_change_req(s);
1746 }
Damien Millerc7ef63d2002-02-05 12:21:42 +11001747 return success;
Damien Millerefb4afe2000-04-12 18:45:05 +10001748}
1749
1750void
1751session_set_fds(Session *s, int fdin, int fdout, int fderr)
1752{
1753 if (!compat20)
1754 fatal("session_set_fds: called for proto != 2.0");
1755 /*
1756 * now that have a child and a pipe to the child,
1757 * we can activate our channel and register the fd's
1758 */
1759 if (s->chanid == -1)
1760 fatal("no channel for session %d", s->self);
1761 channel_set_fds(s->chanid,
1762 fdout, fdin, fderr,
Damien Miller69b69aa2000-10-28 14:19:58 +11001763 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
Damien Miller19a59452002-02-19 15:20:57 +11001764 1,
1765 CHAN_SES_WINDOW_DEFAULT);
Damien Millerefb4afe2000-04-12 18:45:05 +10001766}
1767
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001768/*
1769 * Function to perform pty cleanup. Also called if we get aborted abnormally
1770 * (e.g., due to a dropped connection).
1771 */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001772void
1773session_pty_cleanup2(void *session)
Damien Millerb38eff82000-04-01 11:09:21 +10001774{
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001775 Session *s = session;
1776
1777 if (s == NULL) {
1778 error("session_pty_cleanup: no session");
1779 return;
1780 }
1781 if (s->ttyfd == -1)
Damien Millerb38eff82000-04-01 11:09:21 +10001782 return;
1783
Kevin Steves43cdef32001-02-11 14:12:08 +00001784 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
Damien Millerb38eff82000-04-01 11:09:21 +10001785
Damien Millerb38eff82000-04-01 11:09:21 +10001786 /* Record that the user has logged out. */
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001787 if (s->pid != 0)
Tim Ricee06ae4a2002-02-24 17:56:46 -08001788 record_logout(s->pid, s->tty, s->pw->pw_name);
Damien Millerb38eff82000-04-01 11:09:21 +10001789
1790 /* Release the pseudo-tty. */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001791 if (getuid() == 0)
1792 pty_release(s->tty);
Damien Millerb38eff82000-04-01 11:09:21 +10001793
1794 /*
1795 * Close the server side of the socket pairs. We must do this after
1796 * the pty cleanup, so that another process doesn't get this pty
1797 * while we're still cleaning up.
1798 */
1799 if (close(s->ptymaster) < 0)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001800 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
Damien Miller0585d512001-10-12 11:35:50 +10001801
1802 /* unlink pty from session */
1803 s->ttyfd = -1;
Damien Millerb38eff82000-04-01 11:09:21 +10001804}
Damien Millerefb4afe2000-04-12 18:45:05 +10001805
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001806void
1807session_pty_cleanup(void *session)
1808{
1809 PRIVSEP(session_pty_cleanup2(session));
1810}
1811
Ben Lindstrombba81212001-06-25 05:01:22 +00001812static void
Damien Millerefb4afe2000-04-12 18:45:05 +10001813session_exit_message(Session *s, int status)
1814{
1815 Channel *c;
Damien Millerf3dcf1f2002-02-08 22:06:48 +11001816
1817 if ((c = channel_lookup(s->chanid)) == NULL)
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001818 fatal("session_exit_message: session %d: no channel %d",
Damien Millerefb4afe2000-04-12 18:45:05 +10001819 s->self, s->chanid);
Ben Lindstromce0f6342002-06-11 16:42:49 +00001820 debug("session_exit_message: session %d channel %d pid %ld",
1821 s->self, s->chanid, (long)s->pid);
Damien Millerefb4afe2000-04-12 18:45:05 +10001822
1823 if (WIFEXITED(status)) {
Damien Millerf3dcf1f2002-02-08 22:06:48 +11001824 channel_request_start(s->chanid, "exit-status", 0);
Damien Millerefb4afe2000-04-12 18:45:05 +10001825 packet_put_int(WEXITSTATUS(status));
1826 packet_send();
1827 } else if (WIFSIGNALED(status)) {
Damien Millerf3dcf1f2002-02-08 22:06:48 +11001828 channel_request_start(s->chanid, "exit-signal", 0);
Damien Millerefb4afe2000-04-12 18:45:05 +10001829 packet_put_int(WTERMSIG(status));
Damien Millerf3c6cf12000-05-17 22:08:29 +10001830#ifdef WCOREDUMP
Damien Millerefb4afe2000-04-12 18:45:05 +10001831 packet_put_char(WCOREDUMP(status));
Damien Millerf3c6cf12000-05-17 22:08:29 +10001832#else /* WCOREDUMP */
1833 packet_put_char(0);
1834#endif /* WCOREDUMP */
Damien Millerefb4afe2000-04-12 18:45:05 +10001835 packet_put_cstring("");
1836 packet_put_cstring("");
1837 packet_send();
1838 } else {
1839 /* Some weird exit cause. Just exit. */
1840 packet_disconnect("wait returned status %04x.", status);
1841 }
1842
1843 /* disconnect channel */
1844 debug("session_exit_message: release channel %d", s->chanid);
1845 channel_cancel_cleanup(s->chanid);
Damien Miller166fca82000-04-20 07:42:21 +10001846 /*
1847 * emulate a write failure with 'chan_write_failed', nobody will be
1848 * interested in data we write.
1849 * Note that we must not call 'chan_read_failed', since there could
1850 * be some more data waiting in the pipe.
1851 */
Damien Millerbd483e72000-04-30 10:00:53 +10001852 if (c->ostate != CHAN_OUTPUT_CLOSED)
1853 chan_write_failed(c);
Damien Millerefb4afe2000-04-12 18:45:05 +10001854 s->chanid = -1;
1855}
1856
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001857void
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001858session_close(Session *s)
Damien Millerefb4afe2000-04-12 18:45:05 +10001859{
Ben Lindstromce0f6342002-06-11 16:42:49 +00001860 debug("session_close: session %d pid %ld", s->self, (long)s->pid);
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001861 if (s->ttyfd != -1) {
1862 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1863 session_pty_cleanup(s);
1864 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001865 if (s->term)
1866 xfree(s->term);
1867 if (s->display)
1868 xfree(s->display);
Damien Miller512bccb2002-02-05 12:11:02 +11001869 if (s->auth_display)
1870 xfree(s->auth_display);
Damien Millerefb4afe2000-04-12 18:45:05 +10001871 if (s->auth_data)
1872 xfree(s->auth_data);
1873 if (s->auth_proto)
1874 xfree(s->auth_proto);
1875 s->used = 0;
Damien Millere247cc42000-05-07 12:03:14 +10001876 session_proctitle(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001877}
1878
1879void
1880session_close_by_pid(pid_t pid, int status)
1881{
1882 Session *s = session_by_pid(pid);
1883 if (s == NULL) {
Ben Lindstromce0f6342002-06-11 16:42:49 +00001884 debug("session_close_by_pid: no session for pid %ld",
1885 (long)pid);
Damien Millerefb4afe2000-04-12 18:45:05 +10001886 return;
1887 }
1888 if (s->chanid != -1)
1889 session_exit_message(s, status);
1890 session_close(s);
1891}
1892
1893/*
1894 * this is called when a channel dies before
1895 * the session 'child' itself dies
1896 */
1897void
1898session_close_by_channel(int id, void *arg)
1899{
1900 Session *s = session_by_channel(id);
1901 if (s == NULL) {
Damien Miller3ec27592001-10-12 11:35:04 +10001902 debug("session_close_by_channel: no session for id %d", id);
Damien Millerefb4afe2000-04-12 18:45:05 +10001903 return;
1904 }
Ben Lindstromce0f6342002-06-11 16:42:49 +00001905 debug("session_close_by_channel: channel %d child %ld",
1906 id, (long)s->pid);
Damien Miller3ec27592001-10-12 11:35:04 +10001907 if (s->pid != 0) {
Damien Miller3ec27592001-10-12 11:35:04 +10001908 debug("session_close_by_channel: channel %d: has child", id);
Damien Miller0585d512001-10-12 11:35:50 +10001909 /*
1910 * delay detach of session, but release pty, since
1911 * the fd's to the child are already closed
1912 */
1913 if (s->ttyfd != -1) {
1914 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1915 session_pty_cleanup(s);
1916 }
Damien Miller3ec27592001-10-12 11:35:04 +10001917 return;
1918 }
1919 /* detach by removing callback */
Damien Millerefb4afe2000-04-12 18:45:05 +10001920 channel_cancel_cleanup(s->chanid);
1921 s->chanid = -1;
Damien Miller52b77be2001-10-10 15:14:37 +10001922 session_close(s);
1923}
1924
1925void
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001926session_destroy_all(void (*closefunc)(Session *))
Damien Miller52b77be2001-10-10 15:14:37 +10001927{
1928 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001929 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Miller52b77be2001-10-10 15:14:37 +10001930 Session *s = &sessions[i];
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001931 if (s->used) {
1932 if (closefunc != NULL)
1933 closefunc(s);
1934 else
1935 session_close(s);
1936 }
Damien Miller52b77be2001-10-10 15:14:37 +10001937 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001938}
1939
Ben Lindstrombba81212001-06-25 05:01:22 +00001940static char *
Damien Millere247cc42000-05-07 12:03:14 +10001941session_tty_list(void)
1942{
1943 static char buf[1024];
1944 int i;
1945 buf[0] = '\0';
Damien Miller9f0f5c62001-12-21 14:45:46 +11001946 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millere247cc42000-05-07 12:03:14 +10001947 Session *s = &sessions[i];
1948 if (s->used && s->ttyfd != -1) {
1949 if (buf[0] != '\0')
1950 strlcat(buf, ",", sizeof buf);
1951 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1952 }
1953 }
1954 if (buf[0] == '\0')
1955 strlcpy(buf, "notty", sizeof buf);
1956 return buf;
1957}
1958
1959void
1960session_proctitle(Session *s)
1961{
1962 if (s->pw == NULL)
1963 error("no user for session %d", s->self);
1964 else
1965 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1966}
1967
Ben Lindstrom768176b2001-06-09 01:29:12 +00001968int
1969session_setup_x11fwd(Session *s)
1970{
Ben Lindstrom768176b2001-06-09 01:29:12 +00001971 struct stat st;
Kevin Steves366298c2001-12-19 17:58:01 +00001972 char display[512], auth_display[512];
1973 char hostname[MAXHOSTNAMELEN];
Ben Lindstrom768176b2001-06-09 01:29:12 +00001974
1975 if (no_x11_forwarding_flag) {
1976 packet_send_debug("X11 forwarding disabled in user configuration file.");
1977 return 0;
1978 }
1979 if (!options.x11_forwarding) {
1980 debug("X11 forwarding disabled in server configuration file.");
1981 return 0;
1982 }
1983 if (!options.xauth_location ||
1984 (stat(options.xauth_location, &st) == -1)) {
1985 packet_send_debug("No xauth program; cannot forward with spoofing.");
1986 return 0;
1987 }
Ben Lindstrom699776e2001-06-21 03:14:49 +00001988 if (options.use_login) {
1989 packet_send_debug("X11 forwarding disabled; "
1990 "not compatible with UseLogin=yes.");
1991 return 0;
1992 }
Ben Lindstrom2bcdf062001-06-13 04:41:41 +00001993 if (s->display != NULL) {
Ben Lindstrom768176b2001-06-09 01:29:12 +00001994 debug("X11 display already set.");
1995 return 0;
1996 }
Ben Lindstroma9d2c892002-06-23 21:48:28 +00001997 if (x11_create_display_inet(options.x11_display_offset,
1998 options.x11_use_localhost, s->single_connection,
1999 &s->display_number) == -1) {
Ben Lindstrom2bcdf062001-06-13 04:41:41 +00002000 debug("x11_create_display_inet failed.");
Ben Lindstrom768176b2001-06-09 01:29:12 +00002001 return 0;
2002 }
Kevin Steves366298c2001-12-19 17:58:01 +00002003
2004 /* Set up a suitable value for the DISPLAY variable. */
2005 if (gethostname(hostname, sizeof(hostname)) < 0)
2006 fatal("gethostname: %.100s", strerror(errno));
2007 /*
2008 * auth_display must be used as the displayname when the
2009 * authorization entry is added with xauth(1). This will be
2010 * different than the DISPLAY string for localhost displays.
2011 */
Damien Miller95c249f2002-02-05 12:11:34 +11002012 if (options.x11_use_localhost) {
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002013 snprintf(display, sizeof display, "localhost:%u.%u",
Kevin Steves366298c2001-12-19 17:58:01 +00002014 s->display_number, s->screen);
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002015 snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
Damien Miller512bccb2002-02-05 12:11:02 +11002016 s->display_number, s->screen);
Kevin Steves366298c2001-12-19 17:58:01 +00002017 s->display = xstrdup(display);
Damien Miller512bccb2002-02-05 12:11:02 +11002018 s->auth_display = xstrdup(auth_display);
Kevin Steves366298c2001-12-19 17:58:01 +00002019 } else {
2020#ifdef IPADDR_IN_DISPLAY
2021 struct hostent *he;
2022 struct in_addr my_addr;
2023
2024 he = gethostbyname(hostname);
2025 if (he == NULL) {
2026 error("Can't get IP address for X11 DISPLAY.");
2027 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2028 return 0;
2029 }
2030 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002031 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
Kevin Steves366298c2001-12-19 17:58:01 +00002032 s->display_number, s->screen);
2033#else
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002034 snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
Kevin Steves366298c2001-12-19 17:58:01 +00002035 s->display_number, s->screen);
2036#endif
2037 s->display = xstrdup(display);
Damien Miller512bccb2002-02-05 12:11:02 +11002038 s->auth_display = xstrdup(display);
Kevin Steves366298c2001-12-19 17:58:01 +00002039 }
2040
Ben Lindstrom768176b2001-06-09 01:29:12 +00002041 return 1;
2042}
2043
Ben Lindstrombba81212001-06-25 05:01:22 +00002044static void
Ben Lindstromdb65e8f2001-01-19 04:26:52 +00002045do_authenticated2(Authctxt *authctxt)
Damien Millerefb4afe2000-04-12 18:45:05 +10002046{
Ben Lindstrombddd5512001-07-04 04:53:53 +00002047 server_loop2(authctxt);
Damien Millerefb4afe2000-04-12 18:45:05 +10002048}