blob: d2a460f8985efe5fc2220948c8df4478cf194d9a [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 Lindstrom8bb6f362002-06-11 15:59:02 +000036RCSID("$OpenBSD: session.c,v 1.136 2002/06/10 22:28:41 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 }
165 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%d",
166 auth_sock_dir, (int) getpid());
167
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 Lindstromb31783d2001-03-22 02:02:12 +0000255 int compression_level = 0, enable_compression_after_reply = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000256 u_int proto_len, data_len, dlen;
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 }
282 /* Enable compression after we have responded with SUCCESS. */
283 enable_compression_after_reply = 1;
284 success = 1;
285 break;
286
287 case SSH_CMSG_REQUEST_PTY:
Ben Lindstrom49c12602001-06-13 04:37:36 +0000288 success = session_pty_req(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000289 break;
290
291 case SSH_CMSG_X11_REQUEST_FORWARDING:
Damien Millerb38eff82000-04-01 11:09:21 +1000292 s->auth_proto = packet_get_string(&proto_len);
293 s->auth_data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +1000294
Ben Lindstrom7603b2d2001-02-26 20:13:32 +0000295 screen_flag = packet_get_protocol_flags() &
296 SSH_PROTOFLAG_SCREEN_NUMBER;
297 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
298
299 if (packet_remaining() == 4) {
300 if (!screen_flag)
301 debug2("Buggy client: "
302 "X11 screen flag missing");
Damien Millerb38eff82000-04-01 11:09:21 +1000303 s->screen = packet_get_int();
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000304 } else {
Damien Millerb38eff82000-04-01 11:09:21 +1000305 s->screen = 0;
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000306 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100307 packet_check_eom();
Ben Lindstrom768176b2001-06-09 01:29:12 +0000308 success = session_setup_x11fwd(s);
309 if (!success) {
310 xfree(s->auth_proto);
311 xfree(s->auth_data);
Ben Lindstrom88259fb2001-06-12 00:21:34 +0000312 s->auth_proto = NULL;
313 s->auth_data = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +1000314 }
Damien Millerb38eff82000-04-01 11:09:21 +1000315 break;
Damien Millerb38eff82000-04-01 11:09:21 +1000316
317 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
318 if (no_agent_forwarding_flag || compat13) {
319 debug("Authentication agent forwarding not permitted for this authentication.");
320 break;
321 }
322 debug("Received authentication agent forwarding request.");
Ben Lindstromb31783d2001-03-22 02:02:12 +0000323 success = auth_input_request_forwarding(s->pw);
Damien Millerb38eff82000-04-01 11:09:21 +1000324 break;
325
326 case SSH_CMSG_PORT_FORWARD_REQUEST:
327 if (no_port_forwarding_flag) {
328 debug("Port forwarding not permitted for this authentication.");
329 break;
330 }
Damien Miller50a41ed2000-10-16 12:14:42 +1100331 if (!options.allow_tcp_forwarding) {
332 debug("Port forwarding not permitted.");
333 break;
334 }
Damien Millerb38eff82000-04-01 11:09:21 +1000335 debug("Received TCP/IP port forwarding request.");
Ben Lindstromb31783d2001-03-22 02:02:12 +0000336 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
Damien Millerb38eff82000-04-01 11:09:21 +1000337 success = 1;
338 break;
339
340 case SSH_CMSG_MAX_PACKET_SIZE:
341 if (packet_set_maxsize(packet_get_int()) > 0)
342 success = 1;
343 break;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100344
Ben Lindstromec95ed92001-07-04 04:21:14 +0000345#if defined(AFS) || defined(KRB5)
346 case SSH_CMSG_HAVE_KERBEROS_TGT:
347 if (!options.kerberos_tgt_passing) {
348 verbose("Kerberos TGT passing disabled.");
349 } else {
350 char *kdata = packet_get_string(&dlen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100351 packet_check_eom();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100352
Ben Lindstromec95ed92001-07-04 04:21:14 +0000353 /* XXX - 0x41, see creds_to_radix version */
354 if (kdata[0] != 0x41) {
355#ifdef KRB5
356 krb5_data tgt;
357 tgt.data = kdata;
358 tgt.length = dlen;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100359
Ben Lindstromec95ed92001-07-04 04:21:14 +0000360 if (auth_krb5_tgt(s->authctxt, &tgt))
361 success = 1;
362 else
363 verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user);
364#endif /* KRB5 */
365 } else {
366#ifdef AFS
367 if (auth_krb4_tgt(s->authctxt, kdata))
368 success = 1;
369 else
370 verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user);
371#endif /* AFS */
372 }
373 xfree(kdata);
374 }
375 break;
376#endif /* AFS || KRB5 */
Damien Miller9f0f5c62001-12-21 14:45:46 +1100377
Ben Lindstromec95ed92001-07-04 04:21:14 +0000378#ifdef AFS
379 case SSH_CMSG_HAVE_AFS_TOKEN:
380 if (!options.afs_token_passing || !k_hasafs()) {
381 verbose("AFS token passing disabled.");
382 } else {
383 /* Accept AFS token. */
384 char *token = packet_get_string(&dlen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100385 packet_check_eom();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100386
Ben Lindstromec95ed92001-07-04 04:21:14 +0000387 if (auth_afs_token(s->authctxt, token))
388 success = 1;
389 else
390 verbose("AFS token refused for %.100s",
391 s->authctxt->user);
392 xfree(token);
393 }
394 break;
395#endif /* AFS */
Damien Millerb38eff82000-04-01 11:09:21 +1000396
397 case SSH_CMSG_EXEC_SHELL:
398 case SSH_CMSG_EXEC_CMD:
Damien Millerb38eff82000-04-01 11:09:21 +1000399 if (type == SSH_CMSG_EXEC_CMD) {
400 command = packet_get_string(&dlen);
401 debug("Exec command '%.500s'", command);
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000402 do_exec(s, command);
403 xfree(command);
Damien Millerb38eff82000-04-01 11:09:21 +1000404 } else {
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000405 do_exec(s, NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000406 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100407 packet_check_eom();
Ben Lindstromcb3929d2001-06-09 01:34:15 +0000408 session_close(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000409 return;
410
411 default:
412 /*
413 * Any unknown messages in this phase are ignored,
414 * and a failure message is returned.
415 */
416 log("Unknown packet type received after authentication: %d", type);
417 }
418 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
419 packet_send();
420 packet_write_wait();
421
422 /* Enable compression now that we have replied if appropriate. */
423 if (enable_compression_after_reply) {
424 enable_compression_after_reply = 0;
425 packet_start_compression(compression_level);
426 }
427 }
428}
429
430/*
431 * This is called to fork and execute a command when we have no tty. This
432 * will call do_child from the child, and server_loop from the parent after
433 * setting up file descriptors and such.
434 */
Damien Miller4af51302000-04-16 11:18:38 +1000435void
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000436do_exec_no_pty(Session *s, const char *command)
Damien Millerb38eff82000-04-01 11:09:21 +1000437{
438 int pid;
439
440#ifdef USE_PIPES
441 int pin[2], pout[2], perr[2];
442 /* Allocate pipes for communicating with the program. */
443 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
444 packet_disconnect("Could not create pipes: %.100s",
445 strerror(errno));
446#else /* USE_PIPES */
447 int inout[2], err[2];
448 /* Uses socket pairs to communicate with the program. */
449 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
450 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
451 packet_disconnect("Could not create socket pairs: %.100s",
452 strerror(errno));
453#endif /* USE_PIPES */
454 if (s == NULL)
455 fatal("do_exec_no_pty: no session");
456
Damien Millere247cc42000-05-07 12:03:14 +1000457 session_proctitle(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000458
Damien Millerc5946332001-02-28 11:46:11 +1100459#if defined(USE_PAM)
Damien Miller665af9c2001-06-27 09:34:15 +1000460 do_pam_session(s->pw->pw_name, NULL);
Damien Millerf9e93002001-03-27 16:12:24 +1000461 do_pam_setcred(1);
Damien Millerc3aa3dd2001-10-28 22:34:52 +1100462 if (is_pam_password_change_required())
463 packet_disconnect("Password change required but no "
464 "TTY available");
Kevin Stevesff793a22001-02-21 16:36:51 +0000465#endif /* USE_PAM */
466
Damien Millerb38eff82000-04-01 11:09:21 +1000467 /* Fork the child. */
468 if ((pid = fork()) == 0) {
469 /* Child. Reinitialize the log since the pid has changed. */
470 log_init(__progname, options.log_level, options.log_facility, log_stderr);
471
472 /*
473 * Create a new session and process group since the 4.4BSD
474 * setlogin() affects the entire process group.
475 */
476 if (setsid() < 0)
477 error("setsid failed: %.100s", strerror(errno));
478
479#ifdef USE_PIPES
480 /*
481 * Redirect stdin. We close the parent side of the socket
482 * pair, and make the child side the standard input.
483 */
484 close(pin[1]);
485 if (dup2(pin[0], 0) < 0)
486 perror("dup2 stdin");
487 close(pin[0]);
488
489 /* Redirect stdout. */
490 close(pout[0]);
491 if (dup2(pout[1], 1) < 0)
492 perror("dup2 stdout");
493 close(pout[1]);
494
495 /* Redirect stderr. */
496 close(perr[0]);
497 if (dup2(perr[1], 2) < 0)
498 perror("dup2 stderr");
499 close(perr[1]);
500#else /* USE_PIPES */
501 /*
502 * Redirect stdin, stdout, and stderr. Stdin and stdout will
503 * use the same socket, as some programs (particularly rdist)
504 * seem to depend on it.
505 */
506 close(inout[1]);
507 close(err[1]);
508 if (dup2(inout[0], 0) < 0) /* stdin */
509 perror("dup2 stdin");
510 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
511 perror("dup2 stdout");
512 if (dup2(err[0], 2) < 0) /* stderr */
513 perror("dup2 stderr");
514#endif /* USE_PIPES */
515
516 /* Do processing for the child (exec command etc). */
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000517 do_child(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000518 /* NOTREACHED */
519 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100520#ifdef HAVE_CYGWIN
521 if (is_winnt)
522 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
523#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000524 if (pid < 0)
525 packet_disconnect("fork failed: %.100s", strerror(errno));
526 s->pid = pid;
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000527 /* Set interactive/non-interactive mode. */
528 packet_set_interactive(s->display != NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000529#ifdef USE_PIPES
530 /* We are the parent. Close the child sides of the pipes. */
531 close(pin[0]);
532 close(pout[1]);
533 close(perr[1]);
534
Damien Millerefb4afe2000-04-12 18:45:05 +1000535 if (compat20) {
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000536 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
Damien Millerefb4afe2000-04-12 18:45:05 +1000537 } else {
538 /* Enter the interactive session. */
539 server_loop(pid, pin[1], pout[0], perr[0]);
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000540 /* server_loop has closed pin[1], pout[0], and perr[0]. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000541 }
Damien Millerb38eff82000-04-01 11:09:21 +1000542#else /* USE_PIPES */
543 /* We are the parent. Close the child sides of the socket pairs. */
544 close(inout[0]);
545 close(err[0]);
546
547 /*
548 * Enter the interactive session. Note: server_loop must be able to
549 * handle the case that fdin and fdout are the same.
550 */
Damien Millerefb4afe2000-04-12 18:45:05 +1000551 if (compat20) {
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000552 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
Damien Millerefb4afe2000-04-12 18:45:05 +1000553 } else {
554 server_loop(pid, inout[1], inout[1], err[1]);
555 /* server_loop has closed inout[1] and err[1]. */
556 }
Damien Millerb38eff82000-04-01 11:09:21 +1000557#endif /* USE_PIPES */
558}
559
560/*
561 * This is called to fork and execute a command when we have a tty. This
562 * will call do_child from the child, and server_loop from the parent after
563 * setting up file descriptors, controlling tty, updating wtmp, utmp,
564 * lastlog, and other such operations.
565 */
Damien Miller4af51302000-04-16 11:18:38 +1000566void
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000567do_exec_pty(Session *s, const char *command)
Damien Millerb38eff82000-04-01 11:09:21 +1000568{
Damien Millerb38eff82000-04-01 11:09:21 +1000569 int fdout, ptyfd, ttyfd, ptymaster;
Damien Millerb38eff82000-04-01 11:09:21 +1000570 pid_t pid;
Damien Millerb38eff82000-04-01 11:09:21 +1000571
572 if (s == NULL)
573 fatal("do_exec_pty: no session");
574 ptyfd = s->ptyfd;
575 ttyfd = s->ttyfd;
576
Damien Millerc5946332001-02-28 11:46:11 +1100577#if defined(USE_PAM)
Ben Lindstromb31783d2001-03-22 02:02:12 +0000578 do_pam_session(s->pw->pw_name, s->tty);
Damien Millerf9e93002001-03-27 16:12:24 +1000579 do_pam_setcred(1);
Damien Miller5a761312001-02-27 09:28:23 +1100580#endif
Kevin Stevesff793a22001-02-21 16:36:51 +0000581
Damien Millerb38eff82000-04-01 11:09:21 +1000582 /* Fork the child. */
583 if ((pid = fork()) == 0) {
Ben Lindstrombddd5512001-07-04 04:53:53 +0000584
Damien Miller942da032000-08-18 13:59:06 +1000585 /* Child. Reinitialize the log because the pid has changed. */
Damien Millerb38eff82000-04-01 11:09:21 +1000586 log_init(__progname, options.log_level, options.log_facility, log_stderr);
Damien Millerb38eff82000-04-01 11:09:21 +1000587 /* Close the master side of the pseudo tty. */
588 close(ptyfd);
589
590 /* Make the pseudo tty our controlling tty. */
591 pty_make_controlling_tty(&ttyfd, s->tty);
592
Damien Miller9c751422001-10-10 15:02:46 +1000593 /* Redirect stdin/stdout/stderr from the pseudo tty. */
594 if (dup2(ttyfd, 0) < 0)
595 error("dup2 stdin: %s", strerror(errno));
596 if (dup2(ttyfd, 1) < 0)
597 error("dup2 stdout: %s", strerror(errno));
598 if (dup2(ttyfd, 2) < 0)
599 error("dup2 stderr: %s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +1000600
601 /* Close the extra descriptor for the pseudo tty. */
602 close(ttyfd);
603
Damien Miller942da032000-08-18 13:59:06 +1000604 /* record login, etc. similar to login(1) */
Damien Miller364a9bd2001-04-16 18:37:05 +1000605#ifndef HAVE_OSF_SIA
Damien Miller69b69aa2000-10-28 14:19:58 +1100606 if (!(options.use_login && command == NULL))
607 do_login(s, command);
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000608# ifdef LOGIN_NEEDS_UTMPX
609 else
610 do_pre_login(s);
611# endif
Damien Miller364a9bd2001-04-16 18:37:05 +1000612#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000613
Damien Millerb38eff82000-04-01 11:09:21 +1000614 /* Do common processing for the child, such as execing the command. */
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000615 do_child(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000616 /* NOTREACHED */
617 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100618#ifdef HAVE_CYGWIN
619 if (is_winnt)
620 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
621#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000622 if (pid < 0)
623 packet_disconnect("fork failed: %.100s", strerror(errno));
624 s->pid = pid;
625
626 /* Parent. Close the slave side of the pseudo tty. */
627 close(ttyfd);
628
629 /*
630 * Create another descriptor of the pty master side for use as the
631 * standard input. We could use the original descriptor, but this
632 * simplifies code in server_loop. The descriptor is bidirectional.
633 */
634 fdout = dup(ptyfd);
635 if (fdout < 0)
636 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
637
638 /* we keep a reference to the pty master */
639 ptymaster = dup(ptyfd);
640 if (ptymaster < 0)
641 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
642 s->ptymaster = ptymaster;
643
644 /* Enter interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000645 packet_set_interactive(1);
Damien Millerefb4afe2000-04-12 18:45:05 +1000646 if (compat20) {
647 session_set_fds(s, ptyfd, fdout, -1);
648 } else {
649 server_loop(pid, ptyfd, fdout, -1);
650 /* server_loop _has_ closed ptyfd and fdout. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000651 }
Damien Millerb38eff82000-04-01 11:09:21 +1000652}
653
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000654#ifdef LOGIN_NEEDS_UTMPX
Damien Miller599d8eb2001-09-15 12:25:53 +1000655static void
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000656do_pre_login(Session *s)
657{
658 socklen_t fromlen;
659 struct sockaddr_storage from;
660 pid_t pid = getpid();
661
662 /*
663 * Get IP address of client. If the connection is not a socket, let
664 * the address be 0.0.0.0.
665 */
666 memset(&from, 0, sizeof(from));
667 if (packet_connection_is_on_socket()) {
668 fromlen = sizeof(from);
669 if (getpeername(packet_get_connection_in(),
Damien Miller9f0f5c62001-12-21 14:45:46 +1100670 (struct sockaddr *) & from, &fromlen) < 0) {
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000671 debug("getpeername: %.100s", strerror(errno));
672 fatal_cleanup();
673 }
674 }
675
676 record_utmp_only(pid, s->tty, s->pw->pw_name,
Damien Millerf3451a22002-02-05 12:40:46 +1100677 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000678 (struct sockaddr *)&from);
679}
680#endif
681
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000682/*
683 * This is called to fork and execute a command. If another command is
684 * to be forced, execute that instead.
685 */
686void
687do_exec(Session *s, const char *command)
688{
689 if (forced_command) {
690 original_command = command;
691 command = forced_command;
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000692 debug("Forced command '%.900s'", command);
693 }
694
695 if (s->ttyfd != -1)
696 do_exec_pty(s, command);
697 else
698 do_exec_no_pty(s, command);
699
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000700 original_command = NULL;
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000701}
702
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000703
Damien Miller942da032000-08-18 13:59:06 +1000704/* administrative, login(1)-like work */
705void
Damien Miller69b69aa2000-10-28 14:19:58 +1100706do_login(Session *s, const char *command)
Damien Miller942da032000-08-18 13:59:06 +1000707{
Damien Miller942da032000-08-18 13:59:06 +1000708 char *time_string;
Damien Miller942da032000-08-18 13:59:06 +1000709 socklen_t fromlen;
710 struct sockaddr_storage from;
Damien Miller942da032000-08-18 13:59:06 +1000711 struct passwd * pw = s->pw;
712 pid_t pid = getpid();
713
714 /*
715 * Get IP address of client. If the connection is not a socket, let
716 * the address be 0.0.0.0.
717 */
718 memset(&from, 0, sizeof(from));
719 if (packet_connection_is_on_socket()) {
720 fromlen = sizeof(from);
721 if (getpeername(packet_get_connection_in(),
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000722 (struct sockaddr *) & from, &fromlen) < 0) {
Damien Miller942da032000-08-18 13:59:06 +1000723 debug("getpeername: %.100s", strerror(errno));
724 fatal_cleanup();
725 }
726 }
727
728 /* Record that there was a login on that tty from the remote host. */
Ben Lindstrom2bf56e22002-04-02 20:32:46 +0000729 if (!use_privsep)
730 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
731 get_remote_name_or_ip(utmp_len,
732 options.verify_reverse_mapping),
733 (struct sockaddr *)&from);
Damien Miller942da032000-08-18 13:59:06 +1000734
Kevin Steves092f2ef2000-10-14 13:36:13 +0000735#ifdef USE_PAM
736 /*
737 * If password change is needed, do it now.
738 * This needs to occur before the ~/.hushlogin check.
739 */
Damien Miller646aa602001-02-15 11:51:32 +1100740 if (is_pam_password_change_required()) {
Kevin Steves092f2ef2000-10-14 13:36:13 +0000741 print_pam_messages();
742 do_pam_chauthtok();
743 }
744#endif
745
Damien Millercf205e82001-04-16 18:29:15 +1000746 if (check_quietlogin(s, command))
Damien Miller942da032000-08-18 13:59:06 +1000747 return;
748
749#ifdef USE_PAM
Damien Miller646aa602001-02-15 11:51:32 +1100750 if (!is_pam_password_change_required())
Kevin Steves092f2ef2000-10-14 13:36:13 +0000751 print_pam_messages();
Damien Miller942da032000-08-18 13:59:06 +1000752#endif /* USE_PAM */
753#ifdef WITH_AIXAUTHENTICATE
754 if (aixloginmsg && *aixloginmsg)
755 printf("%s\n", aixloginmsg);
756#endif /* WITH_AIXAUTHENTICATE */
757
Ben Lindstromc447fee2002-04-02 20:35:35 +0000758 if (options.print_lastlog && s->last_login_time != 0) {
759 time_string = ctime(&s->last_login_time);
Damien Miller942da032000-08-18 13:59:06 +1000760 if (strchr(time_string, '\n'))
761 *strchr(time_string, '\n') = 0;
Ben Lindstromc447fee2002-04-02 20:35:35 +0000762 if (strcmp(s->hostname, "") == 0)
Damien Miller942da032000-08-18 13:59:06 +1000763 printf("Last login: %s\r\n", time_string);
764 else
Ben Lindstromc447fee2002-04-02 20:35:35 +0000765 printf("Last login: %s from %s\r\n", time_string,
766 s->hostname);
Damien Miller942da032000-08-18 13:59:06 +1000767 }
Damien Millercf205e82001-04-16 18:29:15 +1000768
769 do_motd();
770}
771
772/*
773 * Display the message of the day.
774 */
775void
776do_motd(void)
777{
778 FILE *f;
779 char buf[256];
780
Damien Miller942da032000-08-18 13:59:06 +1000781 if (options.print_motd) {
Damien Millerad833b32000-08-23 10:46:23 +1000782#ifdef HAVE_LOGIN_CAP
783 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
784 "/etc/motd"), "r");
785#else
Damien Miller942da032000-08-18 13:59:06 +1000786 f = fopen("/etc/motd", "r");
Damien Millerad833b32000-08-23 10:46:23 +1000787#endif
Damien Miller942da032000-08-18 13:59:06 +1000788 if (f) {
789 while (fgets(buf, sizeof(buf), f))
790 fputs(buf, stdout);
791 fclose(f);
792 }
793 }
794}
795
Kevin Steves8f63caa2001-07-04 18:23:02 +0000796
797/*
798 * Check for quiet login, either .hushlogin or command given.
799 */
800int
801check_quietlogin(Session *s, const char *command)
802{
803 char buf[256];
804 struct passwd *pw = s->pw;
805 struct stat st;
806
807 /* Return 1 if .hushlogin exists or a command given. */
808 if (command != NULL)
809 return 1;
810 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
811#ifdef HAVE_LOGIN_CAP
812 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
813 return 1;
814#else
815 if (stat(buf, &st) >= 0)
816 return 1;
817#endif
818 return 0;
819}
820
Damien Millerb38eff82000-04-01 11:09:21 +1000821/*
822 * Sets the value of the given variable in the environment. If the variable
823 * already exists, its value is overriden.
824 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000825static void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000826child_set_env(char ***envp, u_int *envsizep, const char *name,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100827 const char *value)
Damien Millerb38eff82000-04-01 11:09:21 +1000828{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000829 u_int i, namelen;
Damien Millerb38eff82000-04-01 11:09:21 +1000830 char **env;
831
832 /*
833 * Find the slot where the value should be stored. If the variable
834 * already exists, we reuse the slot; otherwise we append a new slot
835 * at the end of the array, expanding if necessary.
836 */
837 env = *envp;
838 namelen = strlen(name);
839 for (i = 0; env[i]; i++)
840 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
841 break;
842 if (env[i]) {
843 /* Reuse the slot. */
844 xfree(env[i]);
845 } else {
846 /* New variable. Expand if necessary. */
847 if (i >= (*envsizep) - 1) {
848 (*envsizep) += 50;
849 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
850 }
851 /* Need to set the NULL pointer at end of array beyond the new slot. */
852 env[i + 1] = NULL;
853 }
854
855 /* Allocate space and format the variable in the appropriate slot. */
856 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
857 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
858}
859
860/*
861 * Reads environment variables from the given file and adds/overrides them
862 * into the environment. If the file does not exist, this does nothing.
863 * Otherwise, it must consist of empty lines, comments (line starts with '#')
864 * and assignments of the form name=value. No other forms are allowed.
865 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000866static void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000867read_environment_file(char ***env, u_int *envsize,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100868 const char *filename)
Damien Millerb38eff82000-04-01 11:09:21 +1000869{
870 FILE *f;
871 char buf[4096];
872 char *cp, *value;
873
874 f = fopen(filename, "r");
875 if (!f)
876 return;
877
878 while (fgets(buf, sizeof(buf), f)) {
879 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
880 ;
881 if (!*cp || *cp == '#' || *cp == '\n')
882 continue;
883 if (strchr(cp, '\n'))
884 *strchr(cp, '\n') = '\0';
885 value = strchr(cp, '=');
886 if (value == NULL) {
887 fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
888 continue;
889 }
Damien Millerb1715dc2000-05-30 13:44:51 +1000890 /*
891 * Replace the equals sign by nul, and advance value to
892 * the value string.
893 */
Damien Millerb38eff82000-04-01 11:09:21 +1000894 *value = '\0';
895 value++;
896 child_set_env(env, envsize, cp, value);
897 }
898 fclose(f);
899}
900
Damien Millerbb9ffc12002-01-08 10:59:32 +1100901void copy_environment(char **source, char ***env, u_int *envsize)
Damien Millerb38eff82000-04-01 11:09:21 +1000902{
Damien Millerbb9ffc12002-01-08 10:59:32 +1100903 char *var_name, *var_val;
Damien Millerb38eff82000-04-01 11:09:21 +1000904 int i;
905
Damien Millerbb9ffc12002-01-08 10:59:32 +1100906 if (source == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +1000907 return;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000908
Damien Millerbb9ffc12002-01-08 10:59:32 +1100909 for(i = 0; source[i] != NULL; i++) {
910 var_name = xstrdup(source[i]);
911 if ((var_val = strstr(var_name, "=")) == NULL) {
912 xfree(var_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000913 continue;
Damien Millerb38eff82000-04-01 11:09:21 +1000914 }
Damien Millerbb9ffc12002-01-08 10:59:32 +1100915 *var_val++ = '\0';
916
917 debug3("Copy environment: %s=%s", var_name, var_val);
918 child_set_env(env, envsize, var_name, var_val);
919
920 xfree(var_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000921 }
922}
Damien Millercb5e44a2000-09-29 12:12:36 +1100923
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000924static char **
925do_setup_env(Session *s, const char *shell)
Damien Millerb38eff82000-04-01 11:09:21 +1000926{
Damien Millerb38eff82000-04-01 11:09:21 +1000927 char buf[256];
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000928 u_int i, envsize;
Damien Millerb38eff82000-04-01 11:09:21 +1000929 char **env;
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000930 struct passwd *pw = s->pw;
Damien Millerb38eff82000-04-01 11:09:21 +1000931
Damien Millerb38eff82000-04-01 11:09:21 +1000932 /* Initialize the environment. */
933 envsize = 100;
934 env = xmalloc(envsize * sizeof(char *));
935 env[0] = NULL;
936
Damien Millerbac2d8a2000-09-05 16:13:06 +1100937#ifdef HAVE_CYGWIN
938 /*
939 * The Windows environment contains some setting which are
940 * important for a running system. They must not be dropped.
941 */
Damien Millerbb9ffc12002-01-08 10:59:32 +1100942 copy_environment(environ, &env, &envsize);
Damien Millerbac2d8a2000-09-05 16:13:06 +1100943#endif
944
Damien Millerb38eff82000-04-01 11:09:21 +1000945 if (!options.use_login) {
946 /* Set basic environment. */
947 child_set_env(&env, &envsize, "USER", pw->pw_name);
948 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
949 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
Damien Millerad833b32000-08-23 10:46:23 +1000950#ifdef HAVE_LOGIN_CAP
951 (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
952 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
Damien Millercb5e44a2000-09-29 12:12:36 +1100953#else /* HAVE_LOGIN_CAP */
954# ifndef HAVE_CYGWIN
Damien Millerbac2d8a2000-09-05 16:13:06 +1100955 /*
956 * There's no standard path on Windows. The path contains
957 * important components pointing to the system directories,
958 * needed for loading shared libraries. So the path better
959 * remains intact here.
960 */
Damien Millera18bbd32002-05-13 10:48:57 +1000961# ifdef SUPERUSER_PATH
962 child_set_env(&env, &envsize, "PATH",
963 s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH);
964# else
Damien Millerb38eff82000-04-01 11:09:21 +1000965 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
Damien Millera18bbd32002-05-13 10:48:57 +1000966# endif /* SUPERUSER_PATH */
Damien Millercb5e44a2000-09-29 12:12:36 +1100967# endif /* HAVE_CYGWIN */
968#endif /* HAVE_LOGIN_CAP */
Damien Millerb38eff82000-04-01 11:09:21 +1000969
970 snprintf(buf, sizeof buf, "%.200s/%.50s",
971 _PATH_MAILDIR, pw->pw_name);
972 child_set_env(&env, &envsize, "MAIL", buf);
973
974 /* Normal systems set SHELL by default. */
975 child_set_env(&env, &envsize, "SHELL", shell);
976 }
977 if (getenv("TZ"))
978 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
979
980 /* Set custom environment options from RSA authentication. */
Ben Lindstrom38b951c2001-12-06 17:47:47 +0000981 if (!options.use_login) {
982 while (custom_environment) {
983 struct envstring *ce = custom_environment;
984 char *s = ce->s;
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000985
Ben Lindstrom38b951c2001-12-06 17:47:47 +0000986 for (i = 0; s[i] != '=' && s[i]; i++)
987 ;
988 if (s[i] == '=') {
989 s[i] = 0;
990 child_set_env(&env, &envsize, s, s + i + 1);
991 }
992 custom_environment = ce->next;
993 xfree(ce->s);
994 xfree(ce);
Damien Millerb38eff82000-04-01 11:09:21 +1000995 }
Damien Millerb38eff82000-04-01 11:09:21 +1000996 }
997
998 snprintf(buf, sizeof buf, "%.50s %d %d",
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000999 get_remote_ipaddr(), get_remote_port(), get_local_port());
Damien Millerb38eff82000-04-01 11:09:21 +10001000 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1001
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001002 if (s->ttyfd != -1)
1003 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1004 if (s->term)
1005 child_set_env(&env, &envsize, "TERM", s->term);
1006 if (s->display)
1007 child_set_env(&env, &envsize, "DISPLAY", s->display);
Damien Miller7b28dc52000-09-05 13:34:53 +11001008 if (original_command)
1009 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1010 original_command);
Damien Millerb38eff82000-04-01 11:09:21 +10001011
1012#ifdef _AIX
Ben Lindstrom839ac4f2002-02-24 20:42:46 +00001013 {
1014 char *cp;
1015
1016 if ((cp = getenv("AUTHSTATE")) != NULL)
1017 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1018 if ((cp = getenv("KRB5CCNAME")) != NULL)
1019 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1020 read_environment_file(&env, &envsize, "/etc/environment");
1021 }
Damien Millerb38eff82000-04-01 11:09:21 +10001022#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001023#ifdef KRB4
Ben Lindstromec95ed92001-07-04 04:21:14 +00001024 if (s->authctxt->krb4_ticket_file)
1025 child_set_env(&env, &envsize, "KRBTKFILE",
1026 s->authctxt->krb4_ticket_file);
1027#endif
1028#ifdef KRB5
1029 if (s->authctxt->krb5_ticket_file)
1030 child_set_env(&env, &envsize, "KRB5CCNAME",
1031 s->authctxt->krb5_ticket_file);
1032#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001033#ifdef USE_PAM
1034 /* Pull in any environment variables that may have been set by PAM. */
Damien Millerbb9ffc12002-01-08 10:59:32 +11001035 copy_environment(fetch_pam_environment(), &env, &envsize);
Damien Millerb38eff82000-04-01 11:09:21 +10001036#endif /* USE_PAM */
1037
Ben Lindstrom8bb6f362002-06-11 15:59:02 +00001038 if (auth_sock_name != NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001039 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
Ben Lindstrom8bb6f362002-06-11 15:59:02 +00001040 auth_sock_name);
Damien Millerb38eff82000-04-01 11:09:21 +10001041
1042 /* read $HOME/.ssh/environment. */
1043 if (!options.use_login) {
Damien Millerb1715dc2000-05-30 13:44:51 +10001044 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1045 pw->pw_dir);
Damien Millerb38eff82000-04-01 11:09:21 +10001046 read_environment_file(&env, &envsize, buf);
1047 }
1048 if (debug_flag) {
1049 /* dump the environment */
1050 fprintf(stderr, "Environment:\n");
1051 for (i = 0; env[i]; i++)
1052 fprintf(stderr, " %.200s\n", env[i]);
1053 }
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001054 return env;
1055}
1056
1057/*
1058 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1059 * first in this order).
1060 */
1061static void
1062do_rc_files(Session *s, const char *shell)
1063{
1064 FILE *f = NULL;
1065 char cmd[1024];
1066 int do_xauth;
1067 struct stat st;
1068
1069 do_xauth =
1070 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1071
1072 /* ignore _PATH_SSH_USER_RC for subsystems */
1073 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1074 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1075 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1076 if (debug_flag)
1077 fprintf(stderr, "Running %s\n", cmd);
1078 f = popen(cmd, "w");
1079 if (f) {
1080 if (do_xauth)
1081 fprintf(f, "%s %s\n", s->auth_proto,
1082 s->auth_data);
1083 pclose(f);
1084 } else
1085 fprintf(stderr, "Could not run %s\n",
1086 _PATH_SSH_USER_RC);
1087 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1088 if (debug_flag)
1089 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1090 _PATH_SSH_SYSTEM_RC);
1091 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1092 if (f) {
1093 if (do_xauth)
1094 fprintf(f, "%s %s\n", s->auth_proto,
1095 s->auth_data);
1096 pclose(f);
1097 } else
1098 fprintf(stderr, "Could not run %s\n",
1099 _PATH_SSH_SYSTEM_RC);
1100 } else if (do_xauth && options.xauth_location != NULL) {
1101 /* Add authority data to .Xauthority if appropriate. */
1102 if (debug_flag) {
1103 fprintf(stderr,
Ben Lindstromfac77692002-06-06 19:49:54 +00001104 "Running %.500s add "
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001105 "%.100s %.100s %.100s\n",
1106 options.xauth_location, s->auth_display,
1107 s->auth_proto, s->auth_data);
1108 }
1109 snprintf(cmd, sizeof cmd, "%s -q -",
1110 options.xauth_location);
1111 f = popen(cmd, "w");
1112 if (f) {
1113 fprintf(f, "add %s %s %s\n",
1114 s->auth_display, s->auth_proto,
1115 s->auth_data);
1116 pclose(f);
1117 } else {
1118 fprintf(stderr, "Could not run %s\n",
1119 cmd);
1120 }
1121 }
1122}
1123
1124static void
1125do_nologin(struct passwd *pw)
1126{
1127 FILE *f = NULL;
1128 char buf[1024];
1129
1130#ifdef HAVE_LOGIN_CAP
1131 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1132 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1133 _PATH_NOLOGIN), "r");
1134#else
1135 if (pw->pw_uid)
1136 f = fopen(_PATH_NOLOGIN, "r");
1137#endif
1138 if (f) {
1139 /* /etc/nologin exists. Print its contents and exit. */
1140 while (fgets(buf, sizeof(buf), f))
1141 fputs(buf, stderr);
1142 fclose(f);
1143 exit(254);
1144 }
1145}
1146
1147/* Set login name, uid, gid, and groups. */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001148void
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001149do_setusercontext(struct passwd *pw)
1150{
1151#ifdef HAVE_CYGWIN
Ben Lindstrom3107efc2002-02-21 15:37:02 +00001152 if (is_winnt) {
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001153#else /* HAVE_CYGWIN */
1154 if (getuid() == 0 || geteuid() == 0) {
1155#endif /* HAVE_CYGWIN */
1156#ifdef HAVE_GETUSERATTR
1157 set_limits_from_userattr(pw->pw_name);
1158#endif /* HAVE_GETUSERATTR */
1159#ifdef HAVE_LOGIN_CAP
1160 if (setusercontext(lc, pw, pw->pw_uid,
1161 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1162 perror("unable to set user context");
1163 exit(1);
1164 }
1165#else
1166# if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1167 /* Sets login uid for accounting */
1168 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1169 error("setluid: %s", strerror(errno));
1170# endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1171
1172 if (setlogin(pw->pw_name) < 0)
1173 error("setlogin failed: %s", strerror(errno));
1174 if (setgid(pw->pw_gid) < 0) {
1175 perror("setgid");
1176 exit(1);
1177 }
1178 /* Initialize the group list. */
1179 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1180 perror("initgroups");
1181 exit(1);
1182 }
1183 endgrent();
1184# ifdef USE_PAM
1185 /*
1186 * PAM credentials may take the form of supplementary groups.
1187 * These will have been wiped by the above initgroups() call.
1188 * Reestablish them here.
1189 */
1190 do_pam_setcred(0);
1191# endif /* USE_PAM */
1192# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1193 irix_setusercontext(pw);
1194# endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001195 /* Permanently switch to the desired uid. */
1196 permanently_set_uid(pw);
1197#endif
1198 }
1199 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1200 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1201}
1202
Ben Lindstrom08105192002-03-22 02:50:06 +00001203static void
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001204launch_login(struct passwd *pw, const char *hostname)
1205{
1206 /* Launch login(1). */
1207
Ben Lindstrom378a4172002-06-07 14:49:56 +00001208 execl(LOGIN_PROGRAM, "login", "-h", hostname,
Kevin Stevesb4799a32002-03-24 23:19:54 +00001209#ifdef xxxLOGIN_NEEDS_TERM
Ben Lindstrom5a6abda2002-06-09 19:41:48 +00001210 (s->term ? s->term : "unknown"),
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001211#endif /* LOGIN_NEEDS_TERM */
Kevin Steves5feaaef2002-04-23 20:45:55 +00001212#ifdef LOGIN_NO_ENDOPT
1213 "-p", "-f", pw->pw_name, (char *)NULL);
1214#else
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001215 "-p", "-f", "--", pw->pw_name, (char *)NULL);
Kevin Steves5feaaef2002-04-23 20:45:55 +00001216#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001217
1218 /* Login couldn't be executed, die. */
1219
1220 perror("login");
1221 exit(1);
1222}
1223
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001224/*
1225 * Performs common processing for the child, such as setting up the
1226 * environment, closing extra file descriptors, setting the user and group
1227 * ids, and executing the command or shell.
1228 */
1229void
1230do_child(Session *s, const char *command)
1231{
1232 extern char **environ;
1233 char **env;
1234 char *argv[10];
1235 const char *shell, *shell0, *hostname = NULL;
1236 struct passwd *pw = s->pw;
1237 u_int i;
1238
1239 /* remove hostkey from the child's memory */
1240 destroy_sensitive_data();
1241
1242 /* login(1) is only called if we execute the login shell */
1243 if (options.use_login && command != NULL)
1244 options.use_login = 0;
1245
1246 /*
1247 * Login(1) does this as well, and it needs uid 0 for the "-h"
1248 * switch, so we let login(1) to this for us.
1249 */
1250 if (!options.use_login) {
1251#ifdef HAVE_OSF_SIA
1252 session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
1253 if (!check_quietlogin(s, command))
1254 do_motd();
1255#else /* HAVE_OSF_SIA */
1256 do_nologin(pw);
Ben Lindstromc0041352002-02-25 15:48:02 +00001257# ifdef _AIX
1258 aix_usrinfo(pw, s->tty, s->ttyfd);
1259# endif /* _AIX */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001260 do_setusercontext(pw);
1261#endif /* HAVE_OSF_SIA */
1262 }
1263
1264 /*
1265 * Get the shell from the password data. An empty shell field is
1266 * legal, and means /bin/sh.
1267 */
1268 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1269#ifdef HAVE_LOGIN_CAP
1270 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1271#endif
1272
1273 env = do_setup_env(s, shell);
1274
Damien Millerad833b32000-08-23 10:46:23 +10001275 /* we have to stash the hostname before we close our socket. */
1276 if (options.use_login)
Ben Lindstromf15a3862001-04-05 23:32:17 +00001277 hostname = get_remote_name_or_ip(utmp_len,
Damien Millerc5d86352002-02-05 12:13:41 +11001278 options.verify_reverse_mapping);
Damien Millerb38eff82000-04-01 11:09:21 +10001279 /*
1280 * Close the connection descriptors; note that this is the child, and
1281 * the server will still have the socket open, and it is important
1282 * that we do not shutdown it. Note that the descriptors cannot be
1283 * closed before building the environment, as we call
1284 * get_remote_ipaddr there.
1285 */
1286 if (packet_get_connection_in() == packet_get_connection_out())
1287 close(packet_get_connection_in());
1288 else {
1289 close(packet_get_connection_in());
1290 close(packet_get_connection_out());
1291 }
1292 /*
1293 * Close all descriptors related to channels. They will still remain
1294 * open in the parent.
1295 */
1296 /* XXX better use close-on-exec? -markus */
1297 channel_close_all();
1298
1299 /*
1300 * Close any extra file descriptors. Note that there may still be
1301 * descriptors left by system functions. They will be closed later.
1302 */
1303 endpwent();
1304
1305 /*
1306 * Close any extra open file descriptors so that we don\'t have them
1307 * hanging around in clients. Note that we want to do this after
1308 * initgroups, because at least on Solaris 2.3 it leaves file
1309 * descriptors open.
1310 */
1311 for (i = 3; i < 64; i++)
1312 close(i);
1313
Damien Millerb38eff82000-04-01 11:09:21 +10001314 /*
Damien Miller05eda432002-02-10 18:32:28 +11001315 * Must take new environment into use so that .ssh/rc,
1316 * /etc/ssh/sshrc and xauth are run in the proper environment.
Damien Millerb38eff82000-04-01 11:09:21 +10001317 */
1318 environ = env;
1319
Ben Lindstrom37e41c92001-09-16 22:17:15 +00001320#ifdef AFS
1321 /* Try to get AFS tokens for the local cell. */
1322 if (k_hasafs()) {
1323 char cell[64];
Damien Miller9f0f5c62001-12-21 14:45:46 +11001324
Ben Lindstrom37e41c92001-09-16 22:17:15 +00001325 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1326 krb_afslog(cell, 0);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001327
Ben Lindstrom37e41c92001-09-16 22:17:15 +00001328 krb_afslog(0, 0);
1329 }
1330#endif /* AFS */
1331
Damien Miller139d4cd2001-10-10 15:07:44 +10001332 /* Change current directory to the user\'s home directory. */
1333 if (chdir(pw->pw_dir) < 0) {
1334 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1335 pw->pw_dir, strerror(errno));
1336#ifdef HAVE_LOGIN_CAP
1337 if (login_getcapbool(lc, "requirehome", 0))
1338 exit(1);
1339#endif
1340 }
1341
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001342 if (!options.use_login)
1343 do_rc_files(s, shell);
Ben Lindstromde71cda2001-03-24 00:43:26 +00001344
1345 /* restore SIGPIPE for child */
1346 signal(SIGPIPE, SIG_DFL);
1347
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001348 if (options.use_login) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001349 launch_login(pw, hostname);
1350 /* NEVERREACHED */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001351 }
1352
1353 /* Get the last component of the shell name. */
1354 if ((shell0 = strrchr(shell, '/')) != NULL)
1355 shell0++;
1356 else
1357 shell0 = shell;
1358
Damien Millerb38eff82000-04-01 11:09:21 +10001359 /*
1360 * If we have no command, execute the shell. In this case, the shell
1361 * name to be passed in argv[0] is preceded by '-' to indicate that
1362 * this is a login shell.
1363 */
1364 if (!command) {
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001365 char argv0[256];
Damien Millerb38eff82000-04-01 11:09:21 +10001366
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001367 /* Start the shell. Set initial character to '-'. */
1368 argv0[0] = '-';
Damien Millerb38eff82000-04-01 11:09:21 +10001369
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001370 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1371 >= sizeof(argv0) - 1) {
1372 errno = EINVAL;
Damien Millerb38eff82000-04-01 11:09:21 +10001373 perror(shell);
1374 exit(1);
Damien Millerb38eff82000-04-01 11:09:21 +10001375 }
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001376
1377 /* Execute the shell. */
1378 argv[0] = argv0;
1379 argv[1] = NULL;
1380 execve(shell, argv, env);
1381
1382 /* Executing the shell failed. */
1383 perror(shell);
1384 exit(1);
Damien Millerb38eff82000-04-01 11:09:21 +10001385 }
1386 /*
1387 * Execute the command using the user's shell. This uses the -c
1388 * option to execute the command.
1389 */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001390 argv[0] = (char *) shell0;
Damien Millerb38eff82000-04-01 11:09:21 +10001391 argv[1] = "-c";
1392 argv[2] = (char *) command;
1393 argv[3] = NULL;
1394 execve(shell, argv, env);
1395 perror(shell);
1396 exit(1);
1397}
1398
1399Session *
1400session_new(void)
1401{
1402 int i;
1403 static int did_init = 0;
1404 if (!did_init) {
1405 debug("session_new: init");
Damien Miller9f0f5c62001-12-21 14:45:46 +11001406 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001407 sessions[i].used = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001408 }
1409 did_init = 1;
1410 }
Damien Miller9f0f5c62001-12-21 14:45:46 +11001411 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001412 Session *s = &sessions[i];
1413 if (! s->used) {
Ben Lindstrom60294322001-03-26 05:38:25 +00001414 memset(s, 0, sizeof(*s));
Damien Millerb38eff82000-04-01 11:09:21 +10001415 s->chanid = -1;
1416 s->ptyfd = -1;
1417 s->ttyfd = -1;
Damien Millerb38eff82000-04-01 11:09:21 +10001418 s->used = 1;
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001419 s->self = i;
Damien Miller15b29522000-10-14 12:33:48 +11001420 debug("session_new: session %d", i);
Damien Millerb38eff82000-04-01 11:09:21 +10001421 return s;
1422 }
1423 }
1424 return NULL;
1425}
1426
Ben Lindstrombba81212001-06-25 05:01:22 +00001427static void
Damien Millerb38eff82000-04-01 11:09:21 +10001428session_dump(void)
1429{
1430 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001431 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001432 Session *s = &sessions[i];
1433 debug("dump: used %d session %d %p channel %d pid %d",
1434 s->used,
1435 s->self,
1436 s,
1437 s->chanid,
1438 s->pid);
1439 }
1440}
1441
Damien Millerefb4afe2000-04-12 18:45:05 +10001442int
Ben Lindstrombddd5512001-07-04 04:53:53 +00001443session_open(Authctxt *authctxt, int chanid)
Damien Millerefb4afe2000-04-12 18:45:05 +10001444{
1445 Session *s = session_new();
1446 debug("session_open: channel %d", chanid);
1447 if (s == NULL) {
1448 error("no more sessions");
1449 return 0;
1450 }
Ben Lindstrombddd5512001-07-04 04:53:53 +00001451 s->authctxt = authctxt;
1452 s->pw = authctxt->pw;
Damien Millerefb4afe2000-04-12 18:45:05 +10001453 if (s->pw == NULL)
Kevin Steves43cdef32001-02-11 14:12:08 +00001454 fatal("no user for session %d", s->self);
Damien Millerbd483e72000-04-30 10:00:53 +10001455 debug("session_open: session %d: link with channel %d", s->self, chanid);
1456 s->chanid = chanid;
Damien Millerefb4afe2000-04-12 18:45:05 +10001457 return 1;
1458}
1459
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001460Session *
1461session_by_tty(char *tty)
1462{
1463 int i;
1464 for (i = 0; i < MAX_SESSIONS; i++) {
1465 Session *s = &sessions[i];
1466 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1467 debug("session_by_tty: session %d tty %s", i, tty);
1468 return s;
1469 }
1470 }
1471 debug("session_by_tty: unknown tty %.100s", tty);
1472 session_dump();
1473 return NULL;
1474}
1475
Ben Lindstrombba81212001-06-25 05:01:22 +00001476static Session *
Damien Millerefb4afe2000-04-12 18:45:05 +10001477session_by_channel(int id)
1478{
1479 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001480 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerefb4afe2000-04-12 18:45:05 +10001481 Session *s = &sessions[i];
1482 if (s->used && s->chanid == id) {
1483 debug("session_by_channel: session %d channel %d", i, id);
1484 return s;
1485 }
1486 }
1487 debug("session_by_channel: unknown channel %d", id);
1488 session_dump();
1489 return NULL;
1490}
1491
Ben Lindstrombba81212001-06-25 05:01:22 +00001492static Session *
Damien Millerefb4afe2000-04-12 18:45:05 +10001493session_by_pid(pid_t pid)
1494{
1495 int i;
1496 debug("session_by_pid: pid %d", pid);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001497 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerefb4afe2000-04-12 18:45:05 +10001498 Session *s = &sessions[i];
1499 if (s->used && s->pid == pid)
1500 return s;
1501 }
1502 error("session_by_pid: unknown pid %d", pid);
1503 session_dump();
1504 return NULL;
1505}
1506
Ben Lindstrombba81212001-06-25 05:01:22 +00001507static int
Damien Millerefb4afe2000-04-12 18:45:05 +10001508session_window_change_req(Session *s)
1509{
1510 s->col = packet_get_int();
1511 s->row = packet_get_int();
1512 s->xpixel = packet_get_int();
1513 s->ypixel = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001514 packet_check_eom();
Damien Millerefb4afe2000-04-12 18:45:05 +10001515 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1516 return 1;
1517}
1518
Ben Lindstrombba81212001-06-25 05:01:22 +00001519static int
Damien Millerefb4afe2000-04-12 18:45:05 +10001520session_pty_req(Session *s)
1521{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001522 u_int len;
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001523 int n_bytes;
Ben Lindstrom6328ab32002-03-22 02:54:23 +00001524
Ben Lindstrom49c12602001-06-13 04:37:36 +00001525 if (no_pty_flag) {
1526 debug("Allocating a pty not permitted for this authentication.");
Damien Millerf6d9e222000-06-18 14:50:44 +10001527 return 0;
Ben Lindstrom49c12602001-06-13 04:37:36 +00001528 }
1529 if (s->ttyfd != -1) {
1530 packet_disconnect("Protocol error: you already have a pty.");
Damien Miller4af51302000-04-16 11:18:38 +10001531 return 0;
Ben Lindstrom49c12602001-06-13 04:37:36 +00001532 }
Ben Lindstromc447fee2002-04-02 20:35:35 +00001533 /* Get the time and hostname when the user last logged in. */
1534 if (options.print_lastlog) {
1535 s->hostname[0] = '\0';
1536 s->last_login_time = get_last_login_time(s->pw->pw_uid,
1537 s->pw->pw_name, s->hostname, sizeof(s->hostname));
1538 }
Ben Lindstrom49c12602001-06-13 04:37:36 +00001539
Damien Millerefb4afe2000-04-12 18:45:05 +10001540 s->term = packet_get_string(&len);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001541
1542 if (compat20) {
1543 s->col = packet_get_int();
1544 s->row = packet_get_int();
1545 } else {
1546 s->row = packet_get_int();
1547 s->col = packet_get_int();
1548 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001549 s->xpixel = packet_get_int();
1550 s->ypixel = packet_get_int();
1551
1552 if (strcmp(s->term, "") == 0) {
1553 xfree(s->term);
1554 s->term = NULL;
1555 }
Ben Lindstrom49c12602001-06-13 04:37:36 +00001556
Damien Millerefb4afe2000-04-12 18:45:05 +10001557 /* Allocate a pty and open it. */
Ben Lindstrom49c12602001-06-13 04:37:36 +00001558 debug("Allocating pty.");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001559 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
Ben Lindstrom49c12602001-06-13 04:37:36 +00001560 if (s->term)
1561 xfree(s->term);
Damien Millerefb4afe2000-04-12 18:45:05 +10001562 s->term = NULL;
1563 s->ptyfd = -1;
1564 s->ttyfd = -1;
1565 error("session_pty_req: session %d alloc failed", s->self);
Damien Miller4af51302000-04-16 11:18:38 +10001566 return 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001567 }
1568 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001569
1570 /* for SSH1 the tty modes length is not given */
1571 if (!compat20)
1572 n_bytes = packet_remaining();
1573 tty_parse_modes(s->ttyfd, &n_bytes);
1574
Damien Millerefb4afe2000-04-12 18:45:05 +10001575 /*
1576 * Add a cleanup function to clear the utmp entry and record logout
1577 * time in case we call fatal() (e.g., the connection gets closed).
1578 */
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001579 fatal_add_cleanup(session_pty_cleanup, (void *)s);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001580 if (!use_privsep)
1581 pty_setowner(s->pw, s->tty);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001582
1583 /* Set window size from the packet. */
Damien Millerefb4afe2000-04-12 18:45:05 +10001584 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1585
Damien Miller48b03fc2002-01-22 23:11:40 +11001586 packet_check_eom();
Damien Millere247cc42000-05-07 12:03:14 +10001587 session_proctitle(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001588 return 1;
1589}
1590
Ben Lindstrombba81212001-06-25 05:01:22 +00001591static int
Damien Millerbd483e72000-04-30 10:00:53 +10001592session_subsystem_req(Session *s)
1593{
Damien Millerae452462001-10-10 15:08:06 +10001594 struct stat st;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001595 u_int len;
Damien Millerbd483e72000-04-30 10:00:53 +10001596 int success = 0;
Damien Millerae452462001-10-10 15:08:06 +10001597 char *cmd, *subsys = packet_get_string(&len);
Damien Millerf6d9e222000-06-18 14:50:44 +10001598 int i;
Damien Millerbd483e72000-04-30 10:00:53 +10001599
Damien Miller48b03fc2002-01-22 23:11:40 +11001600 packet_check_eom();
Damien Millerbaa08702002-02-05 12:14:10 +11001601 log("subsystem request for %.100s", subsys);
Damien Millerbd483e72000-04-30 10:00:53 +10001602
Damien Millerf6d9e222000-06-18 14:50:44 +10001603 for (i = 0; i < options.num_subsystems; i++) {
Damien Millerae452462001-10-10 15:08:06 +10001604 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1605 cmd = options.subsystem_command[i];
1606 if (stat(cmd, &st) < 0) {
1607 error("subsystem: cannot stat %s: %s", cmd,
1608 strerror(errno));
1609 break;
1610 }
1611 debug("subsystem: exec() %s", cmd);
Ben Lindstromfc9b07d2001-03-22 01:27:23 +00001612 s->is_subsystem = 1;
Damien Millerae452462001-10-10 15:08:06 +10001613 do_exec(s, cmd);
Damien Millerf6d9e222000-06-18 14:50:44 +10001614 success = 1;
Damien Miller5fab4b92002-02-05 12:15:07 +11001615 break;
Damien Millerf6d9e222000-06-18 14:50:44 +10001616 }
1617 }
1618
1619 if (!success)
Damien Millerbaa08702002-02-05 12:14:10 +11001620 log("subsystem request for %.100s failed, subsystem not found",
Damien Millerae452462001-10-10 15:08:06 +10001621 subsys);
Damien Millerf6d9e222000-06-18 14:50:44 +10001622
Damien Millerbd483e72000-04-30 10:00:53 +10001623 xfree(subsys);
1624 return success;
1625}
1626
Ben Lindstrombba81212001-06-25 05:01:22 +00001627static int
Damien Millerbd483e72000-04-30 10:00:53 +10001628session_x11_req(Session *s)
1629{
Ben Lindstrom768176b2001-06-09 01:29:12 +00001630 int success;
Damien Millerbd483e72000-04-30 10:00:53 +10001631
1632 s->single_connection = packet_get_char();
1633 s->auth_proto = packet_get_string(NULL);
1634 s->auth_data = packet_get_string(NULL);
1635 s->screen = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001636 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10001637
Ben Lindstrom768176b2001-06-09 01:29:12 +00001638 success = session_setup_x11fwd(s);
1639 if (!success) {
Damien Millerbd483e72000-04-30 10:00:53 +10001640 xfree(s->auth_proto);
1641 xfree(s->auth_data);
Ben Lindstrom88259fb2001-06-12 00:21:34 +00001642 s->auth_proto = NULL;
1643 s->auth_data = NULL;
Damien Millerbd483e72000-04-30 10:00:53 +10001644 }
Ben Lindstrom768176b2001-06-09 01:29:12 +00001645 return success;
Damien Millerbd483e72000-04-30 10:00:53 +10001646}
1647
Ben Lindstrombba81212001-06-25 05:01:22 +00001648static int
Damien Millerf6d9e222000-06-18 14:50:44 +10001649session_shell_req(Session *s)
1650{
Damien Miller48b03fc2002-01-22 23:11:40 +11001651 packet_check_eom();
Ben Lindstromc85ab8a2001-06-21 03:13:10 +00001652 do_exec(s, NULL);
Damien Millerf6d9e222000-06-18 14:50:44 +10001653 return 1;
1654}
1655
Ben Lindstrombba81212001-06-25 05:01:22 +00001656static int
Damien Millerf6d9e222000-06-18 14:50:44 +10001657session_exec_req(Session *s)
1658{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001659 u_int len;
Damien Millerf6d9e222000-06-18 14:50:44 +10001660 char *command = packet_get_string(&len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001661 packet_check_eom();
Ben Lindstromc85ab8a2001-06-21 03:13:10 +00001662 do_exec(s, command);
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +00001663 xfree(command);
Damien Millerf6d9e222000-06-18 14:50:44 +10001664 return 1;
1665}
1666
Ben Lindstrombba81212001-06-25 05:01:22 +00001667static int
Damien Miller0bc1bd82000-11-13 22:57:25 +11001668session_auth_agent_req(Session *s)
1669{
1670 static int called = 0;
Damien Miller48b03fc2002-01-22 23:11:40 +11001671 packet_check_eom();
Ben Lindstrom14920292000-11-21 21:24:55 +00001672 if (no_agent_forwarding_flag) {
1673 debug("session_auth_agent_req: no_agent_forwarding_flag");
1674 return 0;
1675 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001676 if (called) {
1677 return 0;
1678 } else {
1679 called = 1;
1680 return auth_input_request_forwarding(s->pw);
1681 }
1682}
1683
Damien Millerc7ef63d2002-02-05 12:21:42 +11001684int
1685session_input_channel_req(Channel *c, const char *rtype)
Damien Millerefb4afe2000-04-12 18:45:05 +10001686{
Damien Millerefb4afe2000-04-12 18:45:05 +10001687 int success = 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001688 Session *s;
Damien Millerefb4afe2000-04-12 18:45:05 +10001689
Damien Millerc7ef63d2002-02-05 12:21:42 +11001690 if ((s = session_by_channel(c->self)) == NULL) {
1691 log("session_input_channel_req: no session %d req %.100s",
1692 c->self, rtype);
1693 return 0;
1694 }
1695 debug("session_input_channel_req: session %d req %s", s->self, rtype);
Damien Millerefb4afe2000-04-12 18:45:05 +10001696
1697 /*
Ben Lindstromfc9b07d2001-03-22 01:27:23 +00001698 * a session is in LARVAL state until a shell, a command
1699 * or a subsystem is executed
Damien Millerefb4afe2000-04-12 18:45:05 +10001700 */
1701 if (c->type == SSH_CHANNEL_LARVAL) {
1702 if (strcmp(rtype, "shell") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10001703 success = session_shell_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001704 } else if (strcmp(rtype, "exec") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10001705 success = session_exec_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001706 } else if (strcmp(rtype, "pty-req") == 0) {
Damien Miller5f056372000-04-16 12:31:48 +10001707 success = session_pty_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10001708 } else if (strcmp(rtype, "x11-req") == 0) {
1709 success = session_x11_req(s);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001710 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1711 success = session_auth_agent_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10001712 } else if (strcmp(rtype, "subsystem") == 0) {
1713 success = session_subsystem_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001714 }
1715 }
1716 if (strcmp(rtype, "window-change") == 0) {
1717 success = session_window_change_req(s);
1718 }
Damien Millerc7ef63d2002-02-05 12:21:42 +11001719 return success;
Damien Millerefb4afe2000-04-12 18:45:05 +10001720}
1721
1722void
1723session_set_fds(Session *s, int fdin, int fdout, int fderr)
1724{
1725 if (!compat20)
1726 fatal("session_set_fds: called for proto != 2.0");
1727 /*
1728 * now that have a child and a pipe to the child,
1729 * we can activate our channel and register the fd's
1730 */
1731 if (s->chanid == -1)
1732 fatal("no channel for session %d", s->self);
1733 channel_set_fds(s->chanid,
1734 fdout, fdin, fderr,
Damien Miller69b69aa2000-10-28 14:19:58 +11001735 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
Damien Miller19a59452002-02-19 15:20:57 +11001736 1,
1737 CHAN_SES_WINDOW_DEFAULT);
Damien Millerefb4afe2000-04-12 18:45:05 +10001738}
1739
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001740/*
1741 * Function to perform pty cleanup. Also called if we get aborted abnormally
1742 * (e.g., due to a dropped connection).
1743 */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001744void
1745session_pty_cleanup2(void *session)
Damien Millerb38eff82000-04-01 11:09:21 +10001746{
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001747 Session *s = session;
1748
1749 if (s == NULL) {
1750 error("session_pty_cleanup: no session");
1751 return;
1752 }
1753 if (s->ttyfd == -1)
Damien Millerb38eff82000-04-01 11:09:21 +10001754 return;
1755
Kevin Steves43cdef32001-02-11 14:12:08 +00001756 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
Damien Millerb38eff82000-04-01 11:09:21 +10001757
Damien Millerb38eff82000-04-01 11:09:21 +10001758 /* Record that the user has logged out. */
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001759 if (s->pid != 0)
Tim Ricee06ae4a2002-02-24 17:56:46 -08001760 record_logout(s->pid, s->tty, s->pw->pw_name);
Damien Millerb38eff82000-04-01 11:09:21 +10001761
1762 /* Release the pseudo-tty. */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001763 if (getuid() == 0)
1764 pty_release(s->tty);
Damien Millerb38eff82000-04-01 11:09:21 +10001765
1766 /*
1767 * Close the server side of the socket pairs. We must do this after
1768 * the pty cleanup, so that another process doesn't get this pty
1769 * while we're still cleaning up.
1770 */
1771 if (close(s->ptymaster) < 0)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001772 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
Damien Miller0585d512001-10-12 11:35:50 +10001773
1774 /* unlink pty from session */
1775 s->ttyfd = -1;
Damien Millerb38eff82000-04-01 11:09:21 +10001776}
Damien Millerefb4afe2000-04-12 18:45:05 +10001777
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001778void
1779session_pty_cleanup(void *session)
1780{
1781 PRIVSEP(session_pty_cleanup2(session));
1782}
1783
Ben Lindstrombba81212001-06-25 05:01:22 +00001784static void
Damien Millerefb4afe2000-04-12 18:45:05 +10001785session_exit_message(Session *s, int status)
1786{
1787 Channel *c;
Damien Millerf3dcf1f2002-02-08 22:06:48 +11001788
1789 if ((c = channel_lookup(s->chanid)) == NULL)
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001790 fatal("session_exit_message: session %d: no channel %d",
Damien Millerefb4afe2000-04-12 18:45:05 +10001791 s->self, s->chanid);
1792 debug("session_exit_message: session %d channel %d pid %d",
1793 s->self, s->chanid, s->pid);
1794
1795 if (WIFEXITED(status)) {
Damien Millerf3dcf1f2002-02-08 22:06:48 +11001796 channel_request_start(s->chanid, "exit-status", 0);
Damien Millerefb4afe2000-04-12 18:45:05 +10001797 packet_put_int(WEXITSTATUS(status));
1798 packet_send();
1799 } else if (WIFSIGNALED(status)) {
Damien Millerf3dcf1f2002-02-08 22:06:48 +11001800 channel_request_start(s->chanid, "exit-signal", 0);
Damien Millerefb4afe2000-04-12 18:45:05 +10001801 packet_put_int(WTERMSIG(status));
Damien Millerf3c6cf12000-05-17 22:08:29 +10001802#ifdef WCOREDUMP
Damien Millerefb4afe2000-04-12 18:45:05 +10001803 packet_put_char(WCOREDUMP(status));
Damien Millerf3c6cf12000-05-17 22:08:29 +10001804#else /* WCOREDUMP */
1805 packet_put_char(0);
1806#endif /* WCOREDUMP */
Damien Millerefb4afe2000-04-12 18:45:05 +10001807 packet_put_cstring("");
1808 packet_put_cstring("");
1809 packet_send();
1810 } else {
1811 /* Some weird exit cause. Just exit. */
1812 packet_disconnect("wait returned status %04x.", status);
1813 }
1814
1815 /* disconnect channel */
1816 debug("session_exit_message: release channel %d", s->chanid);
1817 channel_cancel_cleanup(s->chanid);
Damien Miller166fca82000-04-20 07:42:21 +10001818 /*
1819 * emulate a write failure with 'chan_write_failed', nobody will be
1820 * interested in data we write.
1821 * Note that we must not call 'chan_read_failed', since there could
1822 * be some more data waiting in the pipe.
1823 */
Damien Millerbd483e72000-04-30 10:00:53 +10001824 if (c->ostate != CHAN_OUTPUT_CLOSED)
1825 chan_write_failed(c);
Damien Millerefb4afe2000-04-12 18:45:05 +10001826 s->chanid = -1;
1827}
1828
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001829void
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001830session_close(Session *s)
Damien Millerefb4afe2000-04-12 18:45:05 +10001831{
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001832 debug("session_close: session %d pid %d", s->self, s->pid);
1833 if (s->ttyfd != -1) {
1834 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1835 session_pty_cleanup(s);
1836 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001837 if (s->term)
1838 xfree(s->term);
1839 if (s->display)
1840 xfree(s->display);
Damien Miller512bccb2002-02-05 12:11:02 +11001841 if (s->auth_display)
1842 xfree(s->auth_display);
Damien Millerefb4afe2000-04-12 18:45:05 +10001843 if (s->auth_data)
1844 xfree(s->auth_data);
1845 if (s->auth_proto)
1846 xfree(s->auth_proto);
1847 s->used = 0;
Damien Millere247cc42000-05-07 12:03:14 +10001848 session_proctitle(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001849}
1850
1851void
1852session_close_by_pid(pid_t pid, int status)
1853{
1854 Session *s = session_by_pid(pid);
1855 if (s == NULL) {
Ben Lindstrom7a837222001-06-13 19:23:32 +00001856 debug("session_close_by_pid: no session for pid %d", pid);
Damien Millerefb4afe2000-04-12 18:45:05 +10001857 return;
1858 }
1859 if (s->chanid != -1)
1860 session_exit_message(s, status);
1861 session_close(s);
1862}
1863
1864/*
1865 * this is called when a channel dies before
1866 * the session 'child' itself dies
1867 */
1868void
1869session_close_by_channel(int id, void *arg)
1870{
1871 Session *s = session_by_channel(id);
1872 if (s == NULL) {
Damien Miller3ec27592001-10-12 11:35:04 +10001873 debug("session_close_by_channel: no session for id %d", id);
Damien Millerefb4afe2000-04-12 18:45:05 +10001874 return;
1875 }
Damien Miller3ec27592001-10-12 11:35:04 +10001876 debug("session_close_by_channel: channel %d child %d", id, s->pid);
1877 if (s->pid != 0) {
Damien Miller3ec27592001-10-12 11:35:04 +10001878 debug("session_close_by_channel: channel %d: has child", id);
Damien Miller0585d512001-10-12 11:35:50 +10001879 /*
1880 * delay detach of session, but release pty, since
1881 * the fd's to the child are already closed
1882 */
1883 if (s->ttyfd != -1) {
1884 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1885 session_pty_cleanup(s);
1886 }
Damien Miller3ec27592001-10-12 11:35:04 +10001887 return;
1888 }
1889 /* detach by removing callback */
Damien Millerefb4afe2000-04-12 18:45:05 +10001890 channel_cancel_cleanup(s->chanid);
1891 s->chanid = -1;
Damien Miller52b77be2001-10-10 15:14:37 +10001892 session_close(s);
1893}
1894
1895void
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001896session_destroy_all(void (*closefunc)(Session *))
Damien Miller52b77be2001-10-10 15:14:37 +10001897{
1898 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001899 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Miller52b77be2001-10-10 15:14:37 +10001900 Session *s = &sessions[i];
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001901 if (s->used) {
1902 if (closefunc != NULL)
1903 closefunc(s);
1904 else
1905 session_close(s);
1906 }
Damien Miller52b77be2001-10-10 15:14:37 +10001907 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001908}
1909
Ben Lindstrombba81212001-06-25 05:01:22 +00001910static char *
Damien Millere247cc42000-05-07 12:03:14 +10001911session_tty_list(void)
1912{
1913 static char buf[1024];
1914 int i;
1915 buf[0] = '\0';
Damien Miller9f0f5c62001-12-21 14:45:46 +11001916 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millere247cc42000-05-07 12:03:14 +10001917 Session *s = &sessions[i];
1918 if (s->used && s->ttyfd != -1) {
1919 if (buf[0] != '\0')
1920 strlcat(buf, ",", sizeof buf);
1921 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1922 }
1923 }
1924 if (buf[0] == '\0')
1925 strlcpy(buf, "notty", sizeof buf);
1926 return buf;
1927}
1928
1929void
1930session_proctitle(Session *s)
1931{
1932 if (s->pw == NULL)
1933 error("no user for session %d", s->self);
1934 else
1935 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1936}
1937
Ben Lindstrom768176b2001-06-09 01:29:12 +00001938int
1939session_setup_x11fwd(Session *s)
1940{
Ben Lindstrom768176b2001-06-09 01:29:12 +00001941 struct stat st;
Kevin Steves366298c2001-12-19 17:58:01 +00001942 char display[512], auth_display[512];
1943 char hostname[MAXHOSTNAMELEN];
Ben Lindstrom768176b2001-06-09 01:29:12 +00001944
1945 if (no_x11_forwarding_flag) {
1946 packet_send_debug("X11 forwarding disabled in user configuration file.");
1947 return 0;
1948 }
1949 if (!options.x11_forwarding) {
1950 debug("X11 forwarding disabled in server configuration file.");
1951 return 0;
1952 }
1953 if (!options.xauth_location ||
1954 (stat(options.xauth_location, &st) == -1)) {
1955 packet_send_debug("No xauth program; cannot forward with spoofing.");
1956 return 0;
1957 }
Ben Lindstrom699776e2001-06-21 03:14:49 +00001958 if (options.use_login) {
1959 packet_send_debug("X11 forwarding disabled; "
1960 "not compatible with UseLogin=yes.");
1961 return 0;
1962 }
Ben Lindstrom2bcdf062001-06-13 04:41:41 +00001963 if (s->display != NULL) {
Ben Lindstrom768176b2001-06-09 01:29:12 +00001964 debug("X11 display already set.");
1965 return 0;
1966 }
Kevin Steves366298c2001-12-19 17:58:01 +00001967 s->display_number = x11_create_display_inet(options.x11_display_offset,
Damien Miller95c249f2002-02-05 12:11:34 +11001968 options.x11_use_localhost, s->single_connection);
Kevin Steves366298c2001-12-19 17:58:01 +00001969 if (s->display_number == -1) {
Ben Lindstrom2bcdf062001-06-13 04:41:41 +00001970 debug("x11_create_display_inet failed.");
Ben Lindstrom768176b2001-06-09 01:29:12 +00001971 return 0;
1972 }
Kevin Steves366298c2001-12-19 17:58:01 +00001973
1974 /* Set up a suitable value for the DISPLAY variable. */
1975 if (gethostname(hostname, sizeof(hostname)) < 0)
1976 fatal("gethostname: %.100s", strerror(errno));
1977 /*
1978 * auth_display must be used as the displayname when the
1979 * authorization entry is added with xauth(1). This will be
1980 * different than the DISPLAY string for localhost displays.
1981 */
Damien Miller95c249f2002-02-05 12:11:34 +11001982 if (options.x11_use_localhost) {
Kevin Steves366298c2001-12-19 17:58:01 +00001983 snprintf(display, sizeof display, "localhost:%d.%d",
1984 s->display_number, s->screen);
Damien Miller512bccb2002-02-05 12:11:02 +11001985 snprintf(auth_display, sizeof auth_display, "unix:%d.%d",
1986 s->display_number, s->screen);
Kevin Steves366298c2001-12-19 17:58:01 +00001987 s->display = xstrdup(display);
Damien Miller512bccb2002-02-05 12:11:02 +11001988 s->auth_display = xstrdup(auth_display);
Kevin Steves366298c2001-12-19 17:58:01 +00001989 } else {
1990#ifdef IPADDR_IN_DISPLAY
1991 struct hostent *he;
1992 struct in_addr my_addr;
1993
1994 he = gethostbyname(hostname);
1995 if (he == NULL) {
1996 error("Can't get IP address for X11 DISPLAY.");
1997 packet_send_debug("Can't get IP address for X11 DISPLAY.");
1998 return 0;
1999 }
2000 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2001 snprintf(display, sizeof display, "%.50s:%d.%d", inet_ntoa(my_addr),
2002 s->display_number, s->screen);
2003#else
2004 snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
2005 s->display_number, s->screen);
2006#endif
2007 s->display = xstrdup(display);
Damien Miller512bccb2002-02-05 12:11:02 +11002008 s->auth_display = xstrdup(display);
Kevin Steves366298c2001-12-19 17:58:01 +00002009 }
2010
Ben Lindstrom768176b2001-06-09 01:29:12 +00002011 return 1;
2012}
2013
Ben Lindstrombba81212001-06-25 05:01:22 +00002014static void
Ben Lindstromdb65e8f2001-01-19 04:26:52 +00002015do_authenticated2(Authctxt *authctxt)
Damien Millerefb4afe2000-04-12 18:45:05 +10002016{
Ben Lindstrombddd5512001-07-04 04:53:53 +00002017 server_loop2(authctxt);
Damien Millerefb4afe2000-04-12 18:45:05 +10002018}