blob: 10d803e989c8d747efe44ee54f695f4f8d6310fd [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 Lindstromc447fee2002-04-02 20:35:35 +000036RCSID("$OpenBSD: session.c,v 1.134 2002/03/29 18:59:31 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 Lindstromb31783d2001-03-22 02:02:12 +0000114void
115do_authenticated(Authctxt *authctxt)
116{
117 /*
118 * Cancel the alarm we set to limit the time taken for
119 * authentication.
120 */
121 alarm(0);
122 if (startup_pipe != -1) {
123 close(startup_pipe);
124 startup_pipe = -1;
125 }
Damien Millere49d0962001-11-13 23:46:18 +1100126#ifdef WITH_AIXAUTHENTICATE
127 /* We don't have a pty yet, so just label the line as "ssh" */
128 if (loginsuccess(authctxt->user,
Damien Millerf3451a22002-02-05 12:40:46 +1100129 get_canonical_hostname(options.verify_reverse_mapping),
Damien Millere49d0962001-11-13 23:46:18 +1100130 "ssh", &aixloginmsg) < 0)
131 aixloginmsg = NULL;
132#endif /* WITH_AIXAUTHENTICATE */
133
Ben Lindstromb31783d2001-03-22 02:02:12 +0000134 /* setup the channel layer */
135 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
136 channel_permit_all_opens();
137
138 if (compat20)
139 do_authenticated2(authctxt);
140 else
141 do_authenticated1(authctxt);
Ben Lindstrom838394c2001-06-09 01:11:59 +0000142
Ben Lindstrom2bcdf062001-06-13 04:41:41 +0000143 /* remove agent socket */
Ben Lindstrom838394c2001-06-09 01:11:59 +0000144 if (auth_get_socket_name())
Ben Lindstrom983c0982001-06-09 01:20:06 +0000145 auth_sock_cleanup_proc(authctxt->pw);
Ben Lindstromec95ed92001-07-04 04:21:14 +0000146#ifdef KRB4
147 if (options.kerberos_ticket_cleanup)
148 krb4_cleanup_proc(authctxt);
149#endif
150#ifdef KRB5
151 if (options.kerberos_ticket_cleanup)
152 krb5_cleanup_proc(authctxt);
153#endif
Ben Lindstromb31783d2001-03-22 02:02:12 +0000154}
155
Damien Millerb38eff82000-04-01 11:09:21 +1000156/*
Damien Millerb38eff82000-04-01 11:09:21 +1000157 * Prepares for an interactive session. This is called after the user has
158 * been successfully authenticated. During this message exchange, pseudo
159 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
160 * are requested, etc.
161 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000162static void
Ben Lindstromb31783d2001-03-22 02:02:12 +0000163do_authenticated1(Authctxt *authctxt)
Damien Millerb38eff82000-04-01 11:09:21 +1000164{
165 Session *s;
Damien Millerb38eff82000-04-01 11:09:21 +1000166 char *command;
Damien Millerdff50992002-01-22 23:16:32 +1100167 int success, type, screen_flag;
Ben Lindstromb31783d2001-03-22 02:02:12 +0000168 int compression_level = 0, enable_compression_after_reply = 0;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000169 u_int proto_len, data_len, dlen;
Damien Millerb38eff82000-04-01 11:09:21 +1000170
171 s = session_new();
Ben Lindstromec95ed92001-07-04 04:21:14 +0000172 s->authctxt = authctxt;
Ben Lindstromb31783d2001-03-22 02:02:12 +0000173 s->pw = authctxt->pw;
Damien Millerad833b32000-08-23 10:46:23 +1000174
Damien Millerb38eff82000-04-01 11:09:21 +1000175 /*
176 * We stay in this loop until the client requests to execute a shell
177 * or a command.
178 */
179 for (;;) {
Ben Lindstromb31783d2001-03-22 02:02:12 +0000180 success = 0;
Damien Millerb38eff82000-04-01 11:09:21 +1000181
182 /* Get a packet from the client. */
Damien Millerdff50992002-01-22 23:16:32 +1100183 type = packet_read();
Damien Millerb38eff82000-04-01 11:09:21 +1000184
185 /* Process the packet. */
186 switch (type) {
187 case SSH_CMSG_REQUEST_COMPRESSION:
Damien Millerb38eff82000-04-01 11:09:21 +1000188 compression_level = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +1100189 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +1000190 if (compression_level < 1 || compression_level > 9) {
191 packet_send_debug("Received illegal compression level %d.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100192 compression_level);
Damien Millerb38eff82000-04-01 11:09:21 +1000193 break;
194 }
195 /* Enable compression after we have responded with SUCCESS. */
196 enable_compression_after_reply = 1;
197 success = 1;
198 break;
199
200 case SSH_CMSG_REQUEST_PTY:
Ben Lindstrom49c12602001-06-13 04:37:36 +0000201 success = session_pty_req(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000202 break;
203
204 case SSH_CMSG_X11_REQUEST_FORWARDING:
Damien Millerb38eff82000-04-01 11:09:21 +1000205 s->auth_proto = packet_get_string(&proto_len);
206 s->auth_data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +1000207
Ben Lindstrom7603b2d2001-02-26 20:13:32 +0000208 screen_flag = packet_get_protocol_flags() &
209 SSH_PROTOFLAG_SCREEN_NUMBER;
210 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
211
212 if (packet_remaining() == 4) {
213 if (!screen_flag)
214 debug2("Buggy client: "
215 "X11 screen flag missing");
Damien Millerb38eff82000-04-01 11:09:21 +1000216 s->screen = packet_get_int();
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000217 } else {
Damien Millerb38eff82000-04-01 11:09:21 +1000218 s->screen = 0;
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000219 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100220 packet_check_eom();
Ben Lindstrom768176b2001-06-09 01:29:12 +0000221 success = session_setup_x11fwd(s);
222 if (!success) {
223 xfree(s->auth_proto);
224 xfree(s->auth_data);
Ben Lindstrom88259fb2001-06-12 00:21:34 +0000225 s->auth_proto = NULL;
226 s->auth_data = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +1000227 }
Damien Millerb38eff82000-04-01 11:09:21 +1000228 break;
Damien Millerb38eff82000-04-01 11:09:21 +1000229
230 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
231 if (no_agent_forwarding_flag || compat13) {
232 debug("Authentication agent forwarding not permitted for this authentication.");
233 break;
234 }
235 debug("Received authentication agent forwarding request.");
Ben Lindstromb31783d2001-03-22 02:02:12 +0000236 success = auth_input_request_forwarding(s->pw);
Damien Millerb38eff82000-04-01 11:09:21 +1000237 break;
238
239 case SSH_CMSG_PORT_FORWARD_REQUEST:
240 if (no_port_forwarding_flag) {
241 debug("Port forwarding not permitted for this authentication.");
242 break;
243 }
Damien Miller50a41ed2000-10-16 12:14:42 +1100244 if (!options.allow_tcp_forwarding) {
245 debug("Port forwarding not permitted.");
246 break;
247 }
Damien Millerb38eff82000-04-01 11:09:21 +1000248 debug("Received TCP/IP port forwarding request.");
Ben Lindstromb31783d2001-03-22 02:02:12 +0000249 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
Damien Millerb38eff82000-04-01 11:09:21 +1000250 success = 1;
251 break;
252
253 case SSH_CMSG_MAX_PACKET_SIZE:
254 if (packet_set_maxsize(packet_get_int()) > 0)
255 success = 1;
256 break;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100257
Ben Lindstromec95ed92001-07-04 04:21:14 +0000258#if defined(AFS) || defined(KRB5)
259 case SSH_CMSG_HAVE_KERBEROS_TGT:
260 if (!options.kerberos_tgt_passing) {
261 verbose("Kerberos TGT passing disabled.");
262 } else {
263 char *kdata = packet_get_string(&dlen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100264 packet_check_eom();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100265
Ben Lindstromec95ed92001-07-04 04:21:14 +0000266 /* XXX - 0x41, see creds_to_radix version */
267 if (kdata[0] != 0x41) {
268#ifdef KRB5
269 krb5_data tgt;
270 tgt.data = kdata;
271 tgt.length = dlen;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100272
Ben Lindstromec95ed92001-07-04 04:21:14 +0000273 if (auth_krb5_tgt(s->authctxt, &tgt))
274 success = 1;
275 else
276 verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user);
277#endif /* KRB5 */
278 } else {
279#ifdef AFS
280 if (auth_krb4_tgt(s->authctxt, kdata))
281 success = 1;
282 else
283 verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user);
284#endif /* AFS */
285 }
286 xfree(kdata);
287 }
288 break;
289#endif /* AFS || KRB5 */
Damien Miller9f0f5c62001-12-21 14:45:46 +1100290
Ben Lindstromec95ed92001-07-04 04:21:14 +0000291#ifdef AFS
292 case SSH_CMSG_HAVE_AFS_TOKEN:
293 if (!options.afs_token_passing || !k_hasafs()) {
294 verbose("AFS token passing disabled.");
295 } else {
296 /* Accept AFS token. */
297 char *token = packet_get_string(&dlen);
Damien Miller48b03fc2002-01-22 23:11:40 +1100298 packet_check_eom();
Damien Miller9f0f5c62001-12-21 14:45:46 +1100299
Ben Lindstromec95ed92001-07-04 04:21:14 +0000300 if (auth_afs_token(s->authctxt, token))
301 success = 1;
302 else
303 verbose("AFS token refused for %.100s",
304 s->authctxt->user);
305 xfree(token);
306 }
307 break;
308#endif /* AFS */
Damien Millerb38eff82000-04-01 11:09:21 +1000309
310 case SSH_CMSG_EXEC_SHELL:
311 case SSH_CMSG_EXEC_CMD:
Damien Millerb38eff82000-04-01 11:09:21 +1000312 if (type == SSH_CMSG_EXEC_CMD) {
313 command = packet_get_string(&dlen);
314 debug("Exec command '%.500s'", command);
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000315 do_exec(s, command);
316 xfree(command);
Damien Millerb38eff82000-04-01 11:09:21 +1000317 } else {
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000318 do_exec(s, NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000319 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100320 packet_check_eom();
Ben Lindstromcb3929d2001-06-09 01:34:15 +0000321 session_close(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000322 return;
323
324 default:
325 /*
326 * Any unknown messages in this phase are ignored,
327 * and a failure message is returned.
328 */
329 log("Unknown packet type received after authentication: %d", type);
330 }
331 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
332 packet_send();
333 packet_write_wait();
334
335 /* Enable compression now that we have replied if appropriate. */
336 if (enable_compression_after_reply) {
337 enable_compression_after_reply = 0;
338 packet_start_compression(compression_level);
339 }
340 }
341}
342
343/*
344 * This is called to fork and execute a command when we have no tty. This
345 * will call do_child from the child, and server_loop from the parent after
346 * setting up file descriptors and such.
347 */
Damien Miller4af51302000-04-16 11:18:38 +1000348void
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000349do_exec_no_pty(Session *s, const char *command)
Damien Millerb38eff82000-04-01 11:09:21 +1000350{
351 int pid;
352
353#ifdef USE_PIPES
354 int pin[2], pout[2], perr[2];
355 /* Allocate pipes for communicating with the program. */
356 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
357 packet_disconnect("Could not create pipes: %.100s",
358 strerror(errno));
359#else /* USE_PIPES */
360 int inout[2], err[2];
361 /* Uses socket pairs to communicate with the program. */
362 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
363 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
364 packet_disconnect("Could not create socket pairs: %.100s",
365 strerror(errno));
366#endif /* USE_PIPES */
367 if (s == NULL)
368 fatal("do_exec_no_pty: no session");
369
Damien Millere247cc42000-05-07 12:03:14 +1000370 session_proctitle(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000371
Damien Millerc5946332001-02-28 11:46:11 +1100372#if defined(USE_PAM)
Damien Miller665af9c2001-06-27 09:34:15 +1000373 do_pam_session(s->pw->pw_name, NULL);
Damien Millerf9e93002001-03-27 16:12:24 +1000374 do_pam_setcred(1);
Damien Millerc3aa3dd2001-10-28 22:34:52 +1100375 if (is_pam_password_change_required())
376 packet_disconnect("Password change required but no "
377 "TTY available");
Kevin Stevesff793a22001-02-21 16:36:51 +0000378#endif /* USE_PAM */
379
Damien Millerb38eff82000-04-01 11:09:21 +1000380 /* Fork the child. */
381 if ((pid = fork()) == 0) {
382 /* Child. Reinitialize the log since the pid has changed. */
383 log_init(__progname, options.log_level, options.log_facility, log_stderr);
384
385 /*
386 * Create a new session and process group since the 4.4BSD
387 * setlogin() affects the entire process group.
388 */
389 if (setsid() < 0)
390 error("setsid failed: %.100s", strerror(errno));
391
392#ifdef USE_PIPES
393 /*
394 * Redirect stdin. We close the parent side of the socket
395 * pair, and make the child side the standard input.
396 */
397 close(pin[1]);
398 if (dup2(pin[0], 0) < 0)
399 perror("dup2 stdin");
400 close(pin[0]);
401
402 /* Redirect stdout. */
403 close(pout[0]);
404 if (dup2(pout[1], 1) < 0)
405 perror("dup2 stdout");
406 close(pout[1]);
407
408 /* Redirect stderr. */
409 close(perr[0]);
410 if (dup2(perr[1], 2) < 0)
411 perror("dup2 stderr");
412 close(perr[1]);
413#else /* USE_PIPES */
414 /*
415 * Redirect stdin, stdout, and stderr. Stdin and stdout will
416 * use the same socket, as some programs (particularly rdist)
417 * seem to depend on it.
418 */
419 close(inout[1]);
420 close(err[1]);
421 if (dup2(inout[0], 0) < 0) /* stdin */
422 perror("dup2 stdin");
423 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
424 perror("dup2 stdout");
425 if (dup2(err[0], 2) < 0) /* stderr */
426 perror("dup2 stderr");
427#endif /* USE_PIPES */
428
429 /* Do processing for the child (exec command etc). */
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000430 do_child(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000431 /* NOTREACHED */
432 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100433#ifdef HAVE_CYGWIN
434 if (is_winnt)
435 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
436#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000437 if (pid < 0)
438 packet_disconnect("fork failed: %.100s", strerror(errno));
439 s->pid = pid;
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000440 /* Set interactive/non-interactive mode. */
441 packet_set_interactive(s->display != NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000442#ifdef USE_PIPES
443 /* We are the parent. Close the child sides of the pipes. */
444 close(pin[0]);
445 close(pout[1]);
446 close(perr[1]);
447
Damien Millerefb4afe2000-04-12 18:45:05 +1000448 if (compat20) {
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000449 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
Damien Millerefb4afe2000-04-12 18:45:05 +1000450 } else {
451 /* Enter the interactive session. */
452 server_loop(pid, pin[1], pout[0], perr[0]);
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000453 /* server_loop has closed pin[1], pout[0], and perr[0]. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000454 }
Damien Millerb38eff82000-04-01 11:09:21 +1000455#else /* USE_PIPES */
456 /* We are the parent. Close the child sides of the socket pairs. */
457 close(inout[0]);
458 close(err[0]);
459
460 /*
461 * Enter the interactive session. Note: server_loop must be able to
462 * handle the case that fdin and fdout are the same.
463 */
Damien Millerefb4afe2000-04-12 18:45:05 +1000464 if (compat20) {
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000465 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
Damien Millerefb4afe2000-04-12 18:45:05 +1000466 } else {
467 server_loop(pid, inout[1], inout[1], err[1]);
468 /* server_loop has closed inout[1] and err[1]. */
469 }
Damien Millerb38eff82000-04-01 11:09:21 +1000470#endif /* USE_PIPES */
471}
472
473/*
474 * This is called to fork and execute a command when we have a tty. This
475 * will call do_child from the child, and server_loop from the parent after
476 * setting up file descriptors, controlling tty, updating wtmp, utmp,
477 * lastlog, and other such operations.
478 */
Damien Miller4af51302000-04-16 11:18:38 +1000479void
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000480do_exec_pty(Session *s, const char *command)
Damien Millerb38eff82000-04-01 11:09:21 +1000481{
Damien Millerb38eff82000-04-01 11:09:21 +1000482 int fdout, ptyfd, ttyfd, ptymaster;
Damien Millerb38eff82000-04-01 11:09:21 +1000483 pid_t pid;
Damien Millerb38eff82000-04-01 11:09:21 +1000484
485 if (s == NULL)
486 fatal("do_exec_pty: no session");
487 ptyfd = s->ptyfd;
488 ttyfd = s->ttyfd;
489
Damien Millerc5946332001-02-28 11:46:11 +1100490#if defined(USE_PAM)
Ben Lindstromb31783d2001-03-22 02:02:12 +0000491 do_pam_session(s->pw->pw_name, s->tty);
Damien Millerf9e93002001-03-27 16:12:24 +1000492 do_pam_setcred(1);
Damien Miller5a761312001-02-27 09:28:23 +1100493#endif
Kevin Stevesff793a22001-02-21 16:36:51 +0000494
Damien Millerb38eff82000-04-01 11:09:21 +1000495 /* Fork the child. */
496 if ((pid = fork()) == 0) {
Ben Lindstrombddd5512001-07-04 04:53:53 +0000497
Damien Miller942da032000-08-18 13:59:06 +1000498 /* Child. Reinitialize the log because the pid has changed. */
Damien Millerb38eff82000-04-01 11:09:21 +1000499 log_init(__progname, options.log_level, options.log_facility, log_stderr);
Damien Millerb38eff82000-04-01 11:09:21 +1000500 /* Close the master side of the pseudo tty. */
501 close(ptyfd);
502
503 /* Make the pseudo tty our controlling tty. */
504 pty_make_controlling_tty(&ttyfd, s->tty);
505
Damien Miller9c751422001-10-10 15:02:46 +1000506 /* Redirect stdin/stdout/stderr from the pseudo tty. */
507 if (dup2(ttyfd, 0) < 0)
508 error("dup2 stdin: %s", strerror(errno));
509 if (dup2(ttyfd, 1) < 0)
510 error("dup2 stdout: %s", strerror(errno));
511 if (dup2(ttyfd, 2) < 0)
512 error("dup2 stderr: %s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +1000513
514 /* Close the extra descriptor for the pseudo tty. */
515 close(ttyfd);
516
Damien Miller942da032000-08-18 13:59:06 +1000517 /* record login, etc. similar to login(1) */
Damien Miller364a9bd2001-04-16 18:37:05 +1000518#ifndef HAVE_OSF_SIA
Damien Miller69b69aa2000-10-28 14:19:58 +1100519 if (!(options.use_login && command == NULL))
520 do_login(s, command);
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000521# ifdef LOGIN_NEEDS_UTMPX
522 else
523 do_pre_login(s);
524# endif
Damien Miller364a9bd2001-04-16 18:37:05 +1000525#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000526
Damien Millerb38eff82000-04-01 11:09:21 +1000527 /* Do common processing for the child, such as execing the command. */
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000528 do_child(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000529 /* NOTREACHED */
530 }
Damien Millerbac2d8a2000-09-05 16:13:06 +1100531#ifdef HAVE_CYGWIN
532 if (is_winnt)
533 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
534#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000535 if (pid < 0)
536 packet_disconnect("fork failed: %.100s", strerror(errno));
537 s->pid = pid;
538
539 /* Parent. Close the slave side of the pseudo tty. */
540 close(ttyfd);
541
542 /*
543 * Create another descriptor of the pty master side for use as the
544 * standard input. We could use the original descriptor, but this
545 * simplifies code in server_loop. The descriptor is bidirectional.
546 */
547 fdout = dup(ptyfd);
548 if (fdout < 0)
549 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
550
551 /* we keep a reference to the pty master */
552 ptymaster = dup(ptyfd);
553 if (ptymaster < 0)
554 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
555 s->ptymaster = ptymaster;
556
557 /* Enter interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000558 packet_set_interactive(1);
Damien Millerefb4afe2000-04-12 18:45:05 +1000559 if (compat20) {
560 session_set_fds(s, ptyfd, fdout, -1);
561 } else {
562 server_loop(pid, ptyfd, fdout, -1);
563 /* server_loop _has_ closed ptyfd and fdout. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000564 }
Damien Millerb38eff82000-04-01 11:09:21 +1000565}
566
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000567#ifdef LOGIN_NEEDS_UTMPX
Damien Miller599d8eb2001-09-15 12:25:53 +1000568static void
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000569do_pre_login(Session *s)
570{
571 socklen_t fromlen;
572 struct sockaddr_storage from;
573 pid_t pid = getpid();
574
575 /*
576 * Get IP address of client. If the connection is not a socket, let
577 * the address be 0.0.0.0.
578 */
579 memset(&from, 0, sizeof(from));
580 if (packet_connection_is_on_socket()) {
581 fromlen = sizeof(from);
582 if (getpeername(packet_get_connection_in(),
Damien Miller9f0f5c62001-12-21 14:45:46 +1100583 (struct sockaddr *) & from, &fromlen) < 0) {
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000584 debug("getpeername: %.100s", strerror(errno));
585 fatal_cleanup();
586 }
587 }
588
589 record_utmp_only(pid, s->tty, s->pw->pw_name,
Damien Millerf3451a22002-02-05 12:40:46 +1100590 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000591 (struct sockaddr *)&from);
592}
593#endif
594
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000595/*
596 * This is called to fork and execute a command. If another command is
597 * to be forced, execute that instead.
598 */
599void
600do_exec(Session *s, const char *command)
601{
602 if (forced_command) {
603 original_command = command;
604 command = forced_command;
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000605 debug("Forced command '%.900s'", command);
606 }
607
608 if (s->ttyfd != -1)
609 do_exec_pty(s, command);
610 else
611 do_exec_no_pty(s, command);
612
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000613 original_command = NULL;
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000614}
615
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000616
Damien Miller942da032000-08-18 13:59:06 +1000617/* administrative, login(1)-like work */
618void
Damien Miller69b69aa2000-10-28 14:19:58 +1100619do_login(Session *s, const char *command)
Damien Miller942da032000-08-18 13:59:06 +1000620{
Damien Miller942da032000-08-18 13:59:06 +1000621 char *time_string;
Damien Miller942da032000-08-18 13:59:06 +1000622 socklen_t fromlen;
623 struct sockaddr_storage from;
Damien Miller942da032000-08-18 13:59:06 +1000624 struct passwd * pw = s->pw;
625 pid_t pid = getpid();
626
627 /*
628 * Get IP address of client. If the connection is not a socket, let
629 * the address be 0.0.0.0.
630 */
631 memset(&from, 0, sizeof(from));
632 if (packet_connection_is_on_socket()) {
633 fromlen = sizeof(from);
634 if (getpeername(packet_get_connection_in(),
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000635 (struct sockaddr *) & from, &fromlen) < 0) {
Damien Miller942da032000-08-18 13:59:06 +1000636 debug("getpeername: %.100s", strerror(errno));
637 fatal_cleanup();
638 }
639 }
640
641 /* Record that there was a login on that tty from the remote host. */
Ben Lindstrom2bf56e22002-04-02 20:32:46 +0000642 if (!use_privsep)
643 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
644 get_remote_name_or_ip(utmp_len,
645 options.verify_reverse_mapping),
646 (struct sockaddr *)&from);
Damien Miller942da032000-08-18 13:59:06 +1000647
Kevin Steves092f2ef2000-10-14 13:36:13 +0000648#ifdef USE_PAM
649 /*
650 * If password change is needed, do it now.
651 * This needs to occur before the ~/.hushlogin check.
652 */
Damien Miller646aa602001-02-15 11:51:32 +1100653 if (is_pam_password_change_required()) {
Kevin Steves092f2ef2000-10-14 13:36:13 +0000654 print_pam_messages();
655 do_pam_chauthtok();
656 }
657#endif
658
Damien Millercf205e82001-04-16 18:29:15 +1000659 if (check_quietlogin(s, command))
Damien Miller942da032000-08-18 13:59:06 +1000660 return;
661
662#ifdef USE_PAM
Damien Miller646aa602001-02-15 11:51:32 +1100663 if (!is_pam_password_change_required())
Kevin Steves092f2ef2000-10-14 13:36:13 +0000664 print_pam_messages();
Damien Miller942da032000-08-18 13:59:06 +1000665#endif /* USE_PAM */
666#ifdef WITH_AIXAUTHENTICATE
667 if (aixloginmsg && *aixloginmsg)
668 printf("%s\n", aixloginmsg);
669#endif /* WITH_AIXAUTHENTICATE */
670
Ben Lindstromc447fee2002-04-02 20:35:35 +0000671 if (options.print_lastlog && s->last_login_time != 0) {
672 time_string = ctime(&s->last_login_time);
Damien Miller942da032000-08-18 13:59:06 +1000673 if (strchr(time_string, '\n'))
674 *strchr(time_string, '\n') = 0;
Ben Lindstromc447fee2002-04-02 20:35:35 +0000675 if (strcmp(s->hostname, "") == 0)
Damien Miller942da032000-08-18 13:59:06 +1000676 printf("Last login: %s\r\n", time_string);
677 else
Ben Lindstromc447fee2002-04-02 20:35:35 +0000678 printf("Last login: %s from %s\r\n", time_string,
679 s->hostname);
Damien Miller942da032000-08-18 13:59:06 +1000680 }
Damien Millercf205e82001-04-16 18:29:15 +1000681
682 do_motd();
683}
684
685/*
686 * Display the message of the day.
687 */
688void
689do_motd(void)
690{
691 FILE *f;
692 char buf[256];
693
Damien Miller942da032000-08-18 13:59:06 +1000694 if (options.print_motd) {
Damien Millerad833b32000-08-23 10:46:23 +1000695#ifdef HAVE_LOGIN_CAP
696 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
697 "/etc/motd"), "r");
698#else
Damien Miller942da032000-08-18 13:59:06 +1000699 f = fopen("/etc/motd", "r");
Damien Millerad833b32000-08-23 10:46:23 +1000700#endif
Damien Miller942da032000-08-18 13:59:06 +1000701 if (f) {
702 while (fgets(buf, sizeof(buf), f))
703 fputs(buf, stdout);
704 fclose(f);
705 }
706 }
707}
708
Kevin Steves8f63caa2001-07-04 18:23:02 +0000709
710/*
711 * Check for quiet login, either .hushlogin or command given.
712 */
713int
714check_quietlogin(Session *s, const char *command)
715{
716 char buf[256];
717 struct passwd *pw = s->pw;
718 struct stat st;
719
720 /* Return 1 if .hushlogin exists or a command given. */
721 if (command != NULL)
722 return 1;
723 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
724#ifdef HAVE_LOGIN_CAP
725 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
726 return 1;
727#else
728 if (stat(buf, &st) >= 0)
729 return 1;
730#endif
731 return 0;
732}
733
Damien Millerb38eff82000-04-01 11:09:21 +1000734/*
735 * Sets the value of the given variable in the environment. If the variable
736 * already exists, its value is overriden.
737 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000738static void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000739child_set_env(char ***envp, u_int *envsizep, const char *name,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100740 const char *value)
Damien Millerb38eff82000-04-01 11:09:21 +1000741{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000742 u_int i, namelen;
Damien Millerb38eff82000-04-01 11:09:21 +1000743 char **env;
744
745 /*
746 * Find the slot where the value should be stored. If the variable
747 * already exists, we reuse the slot; otherwise we append a new slot
748 * at the end of the array, expanding if necessary.
749 */
750 env = *envp;
751 namelen = strlen(name);
752 for (i = 0; env[i]; i++)
753 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
754 break;
755 if (env[i]) {
756 /* Reuse the slot. */
757 xfree(env[i]);
758 } else {
759 /* New variable. Expand if necessary. */
760 if (i >= (*envsizep) - 1) {
761 (*envsizep) += 50;
762 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
763 }
764 /* Need to set the NULL pointer at end of array beyond the new slot. */
765 env[i + 1] = NULL;
766 }
767
768 /* Allocate space and format the variable in the appropriate slot. */
769 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
770 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
771}
772
773/*
774 * Reads environment variables from the given file and adds/overrides them
775 * into the environment. If the file does not exist, this does nothing.
776 * Otherwise, it must consist of empty lines, comments (line starts with '#')
777 * and assignments of the form name=value. No other forms are allowed.
778 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000779static void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000780read_environment_file(char ***env, u_int *envsize,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100781 const char *filename)
Damien Millerb38eff82000-04-01 11:09:21 +1000782{
783 FILE *f;
784 char buf[4096];
785 char *cp, *value;
786
787 f = fopen(filename, "r");
788 if (!f)
789 return;
790
791 while (fgets(buf, sizeof(buf), f)) {
792 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
793 ;
794 if (!*cp || *cp == '#' || *cp == '\n')
795 continue;
796 if (strchr(cp, '\n'))
797 *strchr(cp, '\n') = '\0';
798 value = strchr(cp, '=');
799 if (value == NULL) {
800 fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
801 continue;
802 }
Damien Millerb1715dc2000-05-30 13:44:51 +1000803 /*
804 * Replace the equals sign by nul, and advance value to
805 * the value string.
806 */
Damien Millerb38eff82000-04-01 11:09:21 +1000807 *value = '\0';
808 value++;
809 child_set_env(env, envsize, cp, value);
810 }
811 fclose(f);
812}
813
Damien Millerbb9ffc12002-01-08 10:59:32 +1100814void copy_environment(char **source, char ***env, u_int *envsize)
Damien Millerb38eff82000-04-01 11:09:21 +1000815{
Damien Millerbb9ffc12002-01-08 10:59:32 +1100816 char *var_name, *var_val;
Damien Millerb38eff82000-04-01 11:09:21 +1000817 int i;
818
Damien Millerbb9ffc12002-01-08 10:59:32 +1100819 if (source == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +1000820 return;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000821
Damien Millerbb9ffc12002-01-08 10:59:32 +1100822 for(i = 0; source[i] != NULL; i++) {
823 var_name = xstrdup(source[i]);
824 if ((var_val = strstr(var_name, "=")) == NULL) {
825 xfree(var_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000826 continue;
Damien Millerb38eff82000-04-01 11:09:21 +1000827 }
Damien Millerbb9ffc12002-01-08 10:59:32 +1100828 *var_val++ = '\0';
829
830 debug3("Copy environment: %s=%s", var_name, var_val);
831 child_set_env(env, envsize, var_name, var_val);
832
833 xfree(var_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000834 }
835}
Damien Millercb5e44a2000-09-29 12:12:36 +1100836
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000837static char **
838do_setup_env(Session *s, const char *shell)
Damien Millerb38eff82000-04-01 11:09:21 +1000839{
Damien Millerb38eff82000-04-01 11:09:21 +1000840 char buf[256];
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000841 u_int i, envsize;
Damien Millerb38eff82000-04-01 11:09:21 +1000842 char **env;
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000843 struct passwd *pw = s->pw;
Damien Millerb38eff82000-04-01 11:09:21 +1000844
Damien Millerb38eff82000-04-01 11:09:21 +1000845 /* Initialize the environment. */
846 envsize = 100;
847 env = xmalloc(envsize * sizeof(char *));
848 env[0] = NULL;
849
Damien Millerbac2d8a2000-09-05 16:13:06 +1100850#ifdef HAVE_CYGWIN
851 /*
852 * The Windows environment contains some setting which are
853 * important for a running system. They must not be dropped.
854 */
Damien Millerbb9ffc12002-01-08 10:59:32 +1100855 copy_environment(environ, &env, &envsize);
Damien Millerbac2d8a2000-09-05 16:13:06 +1100856#endif
857
Damien Millerb38eff82000-04-01 11:09:21 +1000858 if (!options.use_login) {
859 /* Set basic environment. */
860 child_set_env(&env, &envsize, "USER", pw->pw_name);
861 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
862 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
Damien Millerad833b32000-08-23 10:46:23 +1000863#ifdef HAVE_LOGIN_CAP
864 (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
865 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
Damien Millercb5e44a2000-09-29 12:12:36 +1100866#else /* HAVE_LOGIN_CAP */
867# ifndef HAVE_CYGWIN
Damien Millerbac2d8a2000-09-05 16:13:06 +1100868 /*
869 * There's no standard path on Windows. The path contains
870 * important components pointing to the system directories,
871 * needed for loading shared libraries. So the path better
872 * remains intact here.
873 */
Damien Millera18bbd32002-05-13 10:48:57 +1000874# ifdef SUPERUSER_PATH
875 child_set_env(&env, &envsize, "PATH",
876 s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH);
877# else
Damien Millerb38eff82000-04-01 11:09:21 +1000878 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
Damien Millera18bbd32002-05-13 10:48:57 +1000879# endif /* SUPERUSER_PATH */
Damien Millercb5e44a2000-09-29 12:12:36 +1100880# endif /* HAVE_CYGWIN */
881#endif /* HAVE_LOGIN_CAP */
Damien Millerb38eff82000-04-01 11:09:21 +1000882
883 snprintf(buf, sizeof buf, "%.200s/%.50s",
884 _PATH_MAILDIR, pw->pw_name);
885 child_set_env(&env, &envsize, "MAIL", buf);
886
887 /* Normal systems set SHELL by default. */
888 child_set_env(&env, &envsize, "SHELL", shell);
889 }
890 if (getenv("TZ"))
891 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
892
893 /* Set custom environment options from RSA authentication. */
Ben Lindstrom38b951c2001-12-06 17:47:47 +0000894 if (!options.use_login) {
895 while (custom_environment) {
896 struct envstring *ce = custom_environment;
897 char *s = ce->s;
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000898
Ben Lindstrom38b951c2001-12-06 17:47:47 +0000899 for (i = 0; s[i] != '=' && s[i]; i++)
900 ;
901 if (s[i] == '=') {
902 s[i] = 0;
903 child_set_env(&env, &envsize, s, s + i + 1);
904 }
905 custom_environment = ce->next;
906 xfree(ce->s);
907 xfree(ce);
Damien Millerb38eff82000-04-01 11:09:21 +1000908 }
Damien Millerb38eff82000-04-01 11:09:21 +1000909 }
910
911 snprintf(buf, sizeof buf, "%.50s %d %d",
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000912 get_remote_ipaddr(), get_remote_port(), get_local_port());
Damien Millerb38eff82000-04-01 11:09:21 +1000913 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
914
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000915 if (s->ttyfd != -1)
916 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
917 if (s->term)
918 child_set_env(&env, &envsize, "TERM", s->term);
919 if (s->display)
920 child_set_env(&env, &envsize, "DISPLAY", s->display);
Damien Miller7b28dc52000-09-05 13:34:53 +1100921 if (original_command)
922 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
923 original_command);
Damien Millerb38eff82000-04-01 11:09:21 +1000924
925#ifdef _AIX
Ben Lindstrom839ac4f2002-02-24 20:42:46 +0000926 {
927 char *cp;
928
929 if ((cp = getenv("AUTHSTATE")) != NULL)
930 child_set_env(&env, &envsize, "AUTHSTATE", cp);
931 if ((cp = getenv("KRB5CCNAME")) != NULL)
932 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
933 read_environment_file(&env, &envsize, "/etc/environment");
934 }
Damien Millerb38eff82000-04-01 11:09:21 +1000935#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000936#ifdef KRB4
Ben Lindstromec95ed92001-07-04 04:21:14 +0000937 if (s->authctxt->krb4_ticket_file)
938 child_set_env(&env, &envsize, "KRBTKFILE",
939 s->authctxt->krb4_ticket_file);
940#endif
941#ifdef KRB5
942 if (s->authctxt->krb5_ticket_file)
943 child_set_env(&env, &envsize, "KRB5CCNAME",
944 s->authctxt->krb5_ticket_file);
945#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000946#ifdef USE_PAM
947 /* Pull in any environment variables that may have been set by PAM. */
Damien Millerbb9ffc12002-01-08 10:59:32 +1100948 copy_environment(fetch_pam_environment(), &env, &envsize);
Damien Millerb38eff82000-04-01 11:09:21 +1000949#endif /* USE_PAM */
950
Damien Millerb38eff82000-04-01 11:09:21 +1000951 if (auth_get_socket_name() != NULL)
952 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100953 auth_get_socket_name());
Damien Millerb38eff82000-04-01 11:09:21 +1000954
955 /* read $HOME/.ssh/environment. */
956 if (!options.use_login) {
Damien Millerb1715dc2000-05-30 13:44:51 +1000957 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
958 pw->pw_dir);
Damien Millerb38eff82000-04-01 11:09:21 +1000959 read_environment_file(&env, &envsize, buf);
960 }
961 if (debug_flag) {
962 /* dump the environment */
963 fprintf(stderr, "Environment:\n");
964 for (i = 0; env[i]; i++)
965 fprintf(stderr, " %.200s\n", env[i]);
966 }
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000967 return env;
968}
969
970/*
971 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
972 * first in this order).
973 */
974static void
975do_rc_files(Session *s, const char *shell)
976{
977 FILE *f = NULL;
978 char cmd[1024];
979 int do_xauth;
980 struct stat st;
981
982 do_xauth =
983 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
984
985 /* ignore _PATH_SSH_USER_RC for subsystems */
986 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
987 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
988 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
989 if (debug_flag)
990 fprintf(stderr, "Running %s\n", cmd);
991 f = popen(cmd, "w");
992 if (f) {
993 if (do_xauth)
994 fprintf(f, "%s %s\n", s->auth_proto,
995 s->auth_data);
996 pclose(f);
997 } else
998 fprintf(stderr, "Could not run %s\n",
999 _PATH_SSH_USER_RC);
1000 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1001 if (debug_flag)
1002 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1003 _PATH_SSH_SYSTEM_RC);
1004 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1005 if (f) {
1006 if (do_xauth)
1007 fprintf(f, "%s %s\n", s->auth_proto,
1008 s->auth_data);
1009 pclose(f);
1010 } else
1011 fprintf(stderr, "Could not run %s\n",
1012 _PATH_SSH_SYSTEM_RC);
1013 } else if (do_xauth && options.xauth_location != NULL) {
1014 /* Add authority data to .Xauthority if appropriate. */
1015 if (debug_flag) {
1016 fprintf(stderr,
1017 "Running %.100s add "
1018 "%.100s %.100s %.100s\n",
1019 options.xauth_location, s->auth_display,
1020 s->auth_proto, s->auth_data);
1021 }
1022 snprintf(cmd, sizeof cmd, "%s -q -",
1023 options.xauth_location);
1024 f = popen(cmd, "w");
1025 if (f) {
1026 fprintf(f, "add %s %s %s\n",
1027 s->auth_display, s->auth_proto,
1028 s->auth_data);
1029 pclose(f);
1030 } else {
1031 fprintf(stderr, "Could not run %s\n",
1032 cmd);
1033 }
1034 }
1035}
1036
1037static void
1038do_nologin(struct passwd *pw)
1039{
1040 FILE *f = NULL;
1041 char buf[1024];
1042
1043#ifdef HAVE_LOGIN_CAP
1044 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1045 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1046 _PATH_NOLOGIN), "r");
1047#else
1048 if (pw->pw_uid)
1049 f = fopen(_PATH_NOLOGIN, "r");
1050#endif
1051 if (f) {
1052 /* /etc/nologin exists. Print its contents and exit. */
1053 while (fgets(buf, sizeof(buf), f))
1054 fputs(buf, stderr);
1055 fclose(f);
1056 exit(254);
1057 }
1058}
1059
1060/* Set login name, uid, gid, and groups. */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001061void
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001062do_setusercontext(struct passwd *pw)
1063{
1064#ifdef HAVE_CYGWIN
Ben Lindstrom3107efc2002-02-21 15:37:02 +00001065 if (is_winnt) {
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001066#else /* HAVE_CYGWIN */
1067 if (getuid() == 0 || geteuid() == 0) {
1068#endif /* HAVE_CYGWIN */
1069#ifdef HAVE_GETUSERATTR
1070 set_limits_from_userattr(pw->pw_name);
1071#endif /* HAVE_GETUSERATTR */
1072#ifdef HAVE_LOGIN_CAP
1073 if (setusercontext(lc, pw, pw->pw_uid,
1074 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1075 perror("unable to set user context");
1076 exit(1);
1077 }
1078#else
1079# if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1080 /* Sets login uid for accounting */
1081 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1082 error("setluid: %s", strerror(errno));
1083# endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1084
1085 if (setlogin(pw->pw_name) < 0)
1086 error("setlogin failed: %s", strerror(errno));
1087 if (setgid(pw->pw_gid) < 0) {
1088 perror("setgid");
1089 exit(1);
1090 }
1091 /* Initialize the group list. */
1092 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1093 perror("initgroups");
1094 exit(1);
1095 }
1096 endgrent();
1097# ifdef USE_PAM
1098 /*
1099 * PAM credentials may take the form of supplementary groups.
1100 * These will have been wiped by the above initgroups() call.
1101 * Reestablish them here.
1102 */
1103 do_pam_setcred(0);
1104# endif /* USE_PAM */
1105# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1106 irix_setusercontext(pw);
1107# endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001108 /* Permanently switch to the desired uid. */
1109 permanently_set_uid(pw);
1110#endif
1111 }
1112 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1113 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1114}
1115
Ben Lindstrom08105192002-03-22 02:50:06 +00001116static void
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001117launch_login(struct passwd *pw, const char *hostname)
1118{
1119 /* Launch login(1). */
1120
1121 execl("/usr/bin/login", "login", "-h", hostname,
Kevin Stevesb4799a32002-03-24 23:19:54 +00001122#ifdef xxxLOGIN_NEEDS_TERM
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001123 (s->term ? s->term : "unknown"),
1124#endif /* LOGIN_NEEDS_TERM */
Kevin Steves5feaaef2002-04-23 20:45:55 +00001125#ifdef LOGIN_NO_ENDOPT
1126 "-p", "-f", pw->pw_name, (char *)NULL);
1127#else
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001128 "-p", "-f", "--", pw->pw_name, (char *)NULL);
Kevin Steves5feaaef2002-04-23 20:45:55 +00001129#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001130
1131 /* Login couldn't be executed, die. */
1132
1133 perror("login");
1134 exit(1);
1135}
1136
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001137/*
1138 * Performs common processing for the child, such as setting up the
1139 * environment, closing extra file descriptors, setting the user and group
1140 * ids, and executing the command or shell.
1141 */
1142void
1143do_child(Session *s, const char *command)
1144{
1145 extern char **environ;
1146 char **env;
1147 char *argv[10];
1148 const char *shell, *shell0, *hostname = NULL;
1149 struct passwd *pw = s->pw;
1150 u_int i;
1151
1152 /* remove hostkey from the child's memory */
1153 destroy_sensitive_data();
1154
1155 /* login(1) is only called if we execute the login shell */
1156 if (options.use_login && command != NULL)
1157 options.use_login = 0;
1158
1159 /*
1160 * Login(1) does this as well, and it needs uid 0 for the "-h"
1161 * switch, so we let login(1) to this for us.
1162 */
1163 if (!options.use_login) {
1164#ifdef HAVE_OSF_SIA
1165 session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
1166 if (!check_quietlogin(s, command))
1167 do_motd();
1168#else /* HAVE_OSF_SIA */
1169 do_nologin(pw);
Ben Lindstromc0041352002-02-25 15:48:02 +00001170# ifdef _AIX
1171 aix_usrinfo(pw, s->tty, s->ttyfd);
1172# endif /* _AIX */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001173 do_setusercontext(pw);
1174#endif /* HAVE_OSF_SIA */
1175 }
1176
1177 /*
1178 * Get the shell from the password data. An empty shell field is
1179 * legal, and means /bin/sh.
1180 */
1181 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1182#ifdef HAVE_LOGIN_CAP
1183 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1184#endif
1185
1186 env = do_setup_env(s, shell);
1187
Damien Millerad833b32000-08-23 10:46:23 +10001188 /* we have to stash the hostname before we close our socket. */
1189 if (options.use_login)
Ben Lindstromf15a3862001-04-05 23:32:17 +00001190 hostname = get_remote_name_or_ip(utmp_len,
Damien Millerc5d86352002-02-05 12:13:41 +11001191 options.verify_reverse_mapping);
Damien Millerb38eff82000-04-01 11:09:21 +10001192 /*
1193 * Close the connection descriptors; note that this is the child, and
1194 * the server will still have the socket open, and it is important
1195 * that we do not shutdown it. Note that the descriptors cannot be
1196 * closed before building the environment, as we call
1197 * get_remote_ipaddr there.
1198 */
1199 if (packet_get_connection_in() == packet_get_connection_out())
1200 close(packet_get_connection_in());
1201 else {
1202 close(packet_get_connection_in());
1203 close(packet_get_connection_out());
1204 }
1205 /*
1206 * Close all descriptors related to channels. They will still remain
1207 * open in the parent.
1208 */
1209 /* XXX better use close-on-exec? -markus */
1210 channel_close_all();
1211
1212 /*
1213 * Close any extra file descriptors. Note that there may still be
1214 * descriptors left by system functions. They will be closed later.
1215 */
1216 endpwent();
1217
1218 /*
1219 * Close any extra open file descriptors so that we don\'t have them
1220 * hanging around in clients. Note that we want to do this after
1221 * initgroups, because at least on Solaris 2.3 it leaves file
1222 * descriptors open.
1223 */
1224 for (i = 3; i < 64; i++)
1225 close(i);
1226
Damien Millerb38eff82000-04-01 11:09:21 +10001227 /*
Damien Miller05eda432002-02-10 18:32:28 +11001228 * Must take new environment into use so that .ssh/rc,
1229 * /etc/ssh/sshrc and xauth are run in the proper environment.
Damien Millerb38eff82000-04-01 11:09:21 +10001230 */
1231 environ = env;
1232
Ben Lindstrom37e41c92001-09-16 22:17:15 +00001233#ifdef AFS
1234 /* Try to get AFS tokens for the local cell. */
1235 if (k_hasafs()) {
1236 char cell[64];
Damien Miller9f0f5c62001-12-21 14:45:46 +11001237
Ben Lindstrom37e41c92001-09-16 22:17:15 +00001238 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1239 krb_afslog(cell, 0);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001240
Ben Lindstrom37e41c92001-09-16 22:17:15 +00001241 krb_afslog(0, 0);
1242 }
1243#endif /* AFS */
1244
Damien Miller139d4cd2001-10-10 15:07:44 +10001245 /* Change current directory to the user\'s home directory. */
1246 if (chdir(pw->pw_dir) < 0) {
1247 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1248 pw->pw_dir, strerror(errno));
1249#ifdef HAVE_LOGIN_CAP
1250 if (login_getcapbool(lc, "requirehome", 0))
1251 exit(1);
1252#endif
1253 }
1254
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001255 if (!options.use_login)
1256 do_rc_files(s, shell);
Ben Lindstromde71cda2001-03-24 00:43:26 +00001257
1258 /* restore SIGPIPE for child */
1259 signal(SIGPIPE, SIG_DFL);
1260
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001261 if (options.use_login) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001262 launch_login(pw, hostname);
1263 /* NEVERREACHED */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001264 }
1265
1266 /* Get the last component of the shell name. */
1267 if ((shell0 = strrchr(shell, '/')) != NULL)
1268 shell0++;
1269 else
1270 shell0 = shell;
1271
Damien Millerb38eff82000-04-01 11:09:21 +10001272 /*
1273 * If we have no command, execute the shell. In this case, the shell
1274 * name to be passed in argv[0] is preceded by '-' to indicate that
1275 * this is a login shell.
1276 */
1277 if (!command) {
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001278 char argv0[256];
Damien Millerb38eff82000-04-01 11:09:21 +10001279
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001280 /* Start the shell. Set initial character to '-'. */
1281 argv0[0] = '-';
Damien Millerb38eff82000-04-01 11:09:21 +10001282
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001283 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1284 >= sizeof(argv0) - 1) {
1285 errno = EINVAL;
Damien Millerb38eff82000-04-01 11:09:21 +10001286 perror(shell);
1287 exit(1);
Damien Millerb38eff82000-04-01 11:09:21 +10001288 }
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001289
1290 /* Execute the shell. */
1291 argv[0] = argv0;
1292 argv[1] = NULL;
1293 execve(shell, argv, env);
1294
1295 /* Executing the shell failed. */
1296 perror(shell);
1297 exit(1);
Damien Millerb38eff82000-04-01 11:09:21 +10001298 }
1299 /*
1300 * Execute the command using the user's shell. This uses the -c
1301 * option to execute the command.
1302 */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001303 argv[0] = (char *) shell0;
Damien Millerb38eff82000-04-01 11:09:21 +10001304 argv[1] = "-c";
1305 argv[2] = (char *) command;
1306 argv[3] = NULL;
1307 execve(shell, argv, env);
1308 perror(shell);
1309 exit(1);
1310}
1311
1312Session *
1313session_new(void)
1314{
1315 int i;
1316 static int did_init = 0;
1317 if (!did_init) {
1318 debug("session_new: init");
Damien Miller9f0f5c62001-12-21 14:45:46 +11001319 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001320 sessions[i].used = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001321 }
1322 did_init = 1;
1323 }
Damien Miller9f0f5c62001-12-21 14:45:46 +11001324 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001325 Session *s = &sessions[i];
1326 if (! s->used) {
Ben Lindstrom60294322001-03-26 05:38:25 +00001327 memset(s, 0, sizeof(*s));
Damien Millerb38eff82000-04-01 11:09:21 +10001328 s->chanid = -1;
1329 s->ptyfd = -1;
1330 s->ttyfd = -1;
Damien Millerb38eff82000-04-01 11:09:21 +10001331 s->used = 1;
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001332 s->self = i;
Damien Miller15b29522000-10-14 12:33:48 +11001333 debug("session_new: session %d", i);
Damien Millerb38eff82000-04-01 11:09:21 +10001334 return s;
1335 }
1336 }
1337 return NULL;
1338}
1339
Ben Lindstrombba81212001-06-25 05:01:22 +00001340static void
Damien Millerb38eff82000-04-01 11:09:21 +10001341session_dump(void)
1342{
1343 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001344 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001345 Session *s = &sessions[i];
1346 debug("dump: used %d session %d %p channel %d pid %d",
1347 s->used,
1348 s->self,
1349 s,
1350 s->chanid,
1351 s->pid);
1352 }
1353}
1354
Damien Millerefb4afe2000-04-12 18:45:05 +10001355int
Ben Lindstrombddd5512001-07-04 04:53:53 +00001356session_open(Authctxt *authctxt, int chanid)
Damien Millerefb4afe2000-04-12 18:45:05 +10001357{
1358 Session *s = session_new();
1359 debug("session_open: channel %d", chanid);
1360 if (s == NULL) {
1361 error("no more sessions");
1362 return 0;
1363 }
Ben Lindstrombddd5512001-07-04 04:53:53 +00001364 s->authctxt = authctxt;
1365 s->pw = authctxt->pw;
Damien Millerefb4afe2000-04-12 18:45:05 +10001366 if (s->pw == NULL)
Kevin Steves43cdef32001-02-11 14:12:08 +00001367 fatal("no user for session %d", s->self);
Damien Millerbd483e72000-04-30 10:00:53 +10001368 debug("session_open: session %d: link with channel %d", s->self, chanid);
1369 s->chanid = chanid;
Damien Millerefb4afe2000-04-12 18:45:05 +10001370 return 1;
1371}
1372
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001373Session *
1374session_by_tty(char *tty)
1375{
1376 int i;
1377 for (i = 0; i < MAX_SESSIONS; i++) {
1378 Session *s = &sessions[i];
1379 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1380 debug("session_by_tty: session %d tty %s", i, tty);
1381 return s;
1382 }
1383 }
1384 debug("session_by_tty: unknown tty %.100s", tty);
1385 session_dump();
1386 return NULL;
1387}
1388
Ben Lindstrombba81212001-06-25 05:01:22 +00001389static Session *
Damien Millerefb4afe2000-04-12 18:45:05 +10001390session_by_channel(int id)
1391{
1392 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001393 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerefb4afe2000-04-12 18:45:05 +10001394 Session *s = &sessions[i];
1395 if (s->used && s->chanid == id) {
1396 debug("session_by_channel: session %d channel %d", i, id);
1397 return s;
1398 }
1399 }
1400 debug("session_by_channel: unknown channel %d", id);
1401 session_dump();
1402 return NULL;
1403}
1404
Ben Lindstrombba81212001-06-25 05:01:22 +00001405static Session *
Damien Millerefb4afe2000-04-12 18:45:05 +10001406session_by_pid(pid_t pid)
1407{
1408 int i;
1409 debug("session_by_pid: pid %d", pid);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001410 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerefb4afe2000-04-12 18:45:05 +10001411 Session *s = &sessions[i];
1412 if (s->used && s->pid == pid)
1413 return s;
1414 }
1415 error("session_by_pid: unknown pid %d", pid);
1416 session_dump();
1417 return NULL;
1418}
1419
Ben Lindstrombba81212001-06-25 05:01:22 +00001420static int
Damien Millerefb4afe2000-04-12 18:45:05 +10001421session_window_change_req(Session *s)
1422{
1423 s->col = packet_get_int();
1424 s->row = packet_get_int();
1425 s->xpixel = packet_get_int();
1426 s->ypixel = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001427 packet_check_eom();
Damien Millerefb4afe2000-04-12 18:45:05 +10001428 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1429 return 1;
1430}
1431
Ben Lindstrombba81212001-06-25 05:01:22 +00001432static int
Damien Millerefb4afe2000-04-12 18:45:05 +10001433session_pty_req(Session *s)
1434{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001435 u_int len;
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001436 int n_bytes;
Ben Lindstrom6328ab32002-03-22 02:54:23 +00001437
Ben Lindstrom49c12602001-06-13 04:37:36 +00001438 if (no_pty_flag) {
1439 debug("Allocating a pty not permitted for this authentication.");
Damien Millerf6d9e222000-06-18 14:50:44 +10001440 return 0;
Ben Lindstrom49c12602001-06-13 04:37:36 +00001441 }
1442 if (s->ttyfd != -1) {
1443 packet_disconnect("Protocol error: you already have a pty.");
Damien Miller4af51302000-04-16 11:18:38 +10001444 return 0;
Ben Lindstrom49c12602001-06-13 04:37:36 +00001445 }
Ben Lindstromc447fee2002-04-02 20:35:35 +00001446 /* Get the time and hostname when the user last logged in. */
1447 if (options.print_lastlog) {
1448 s->hostname[0] = '\0';
1449 s->last_login_time = get_last_login_time(s->pw->pw_uid,
1450 s->pw->pw_name, s->hostname, sizeof(s->hostname));
1451 }
Ben Lindstrom49c12602001-06-13 04:37:36 +00001452
Damien Millerefb4afe2000-04-12 18:45:05 +10001453 s->term = packet_get_string(&len);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001454
1455 if (compat20) {
1456 s->col = packet_get_int();
1457 s->row = packet_get_int();
1458 } else {
1459 s->row = packet_get_int();
1460 s->col = packet_get_int();
1461 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001462 s->xpixel = packet_get_int();
1463 s->ypixel = packet_get_int();
1464
1465 if (strcmp(s->term, "") == 0) {
1466 xfree(s->term);
1467 s->term = NULL;
1468 }
Ben Lindstrom49c12602001-06-13 04:37:36 +00001469
Damien Millerefb4afe2000-04-12 18:45:05 +10001470 /* Allocate a pty and open it. */
Ben Lindstrom49c12602001-06-13 04:37:36 +00001471 debug("Allocating pty.");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001472 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
Ben Lindstrom49c12602001-06-13 04:37:36 +00001473 if (s->term)
1474 xfree(s->term);
Damien Millerefb4afe2000-04-12 18:45:05 +10001475 s->term = NULL;
1476 s->ptyfd = -1;
1477 s->ttyfd = -1;
1478 error("session_pty_req: session %d alloc failed", s->self);
Damien Miller4af51302000-04-16 11:18:38 +10001479 return 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001480 }
1481 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001482
1483 /* for SSH1 the tty modes length is not given */
1484 if (!compat20)
1485 n_bytes = packet_remaining();
1486 tty_parse_modes(s->ttyfd, &n_bytes);
1487
Damien Millerefb4afe2000-04-12 18:45:05 +10001488 /*
1489 * Add a cleanup function to clear the utmp entry and record logout
1490 * time in case we call fatal() (e.g., the connection gets closed).
1491 */
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001492 fatal_add_cleanup(session_pty_cleanup, (void *)s);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001493 if (!use_privsep)
1494 pty_setowner(s->pw, s->tty);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001495
1496 /* Set window size from the packet. */
Damien Millerefb4afe2000-04-12 18:45:05 +10001497 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1498
Damien Miller48b03fc2002-01-22 23:11:40 +11001499 packet_check_eom();
Damien Millere247cc42000-05-07 12:03:14 +10001500 session_proctitle(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001501 return 1;
1502}
1503
Ben Lindstrombba81212001-06-25 05:01:22 +00001504static int
Damien Millerbd483e72000-04-30 10:00:53 +10001505session_subsystem_req(Session *s)
1506{
Damien Millerae452462001-10-10 15:08:06 +10001507 struct stat st;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001508 u_int len;
Damien Millerbd483e72000-04-30 10:00:53 +10001509 int success = 0;
Damien Millerae452462001-10-10 15:08:06 +10001510 char *cmd, *subsys = packet_get_string(&len);
Damien Millerf6d9e222000-06-18 14:50:44 +10001511 int i;
Damien Millerbd483e72000-04-30 10:00:53 +10001512
Damien Miller48b03fc2002-01-22 23:11:40 +11001513 packet_check_eom();
Damien Millerbaa08702002-02-05 12:14:10 +11001514 log("subsystem request for %.100s", subsys);
Damien Millerbd483e72000-04-30 10:00:53 +10001515
Damien Millerf6d9e222000-06-18 14:50:44 +10001516 for (i = 0; i < options.num_subsystems; i++) {
Damien Millerae452462001-10-10 15:08:06 +10001517 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1518 cmd = options.subsystem_command[i];
1519 if (stat(cmd, &st) < 0) {
1520 error("subsystem: cannot stat %s: %s", cmd,
1521 strerror(errno));
1522 break;
1523 }
1524 debug("subsystem: exec() %s", cmd);
Ben Lindstromfc9b07d2001-03-22 01:27:23 +00001525 s->is_subsystem = 1;
Damien Millerae452462001-10-10 15:08:06 +10001526 do_exec(s, cmd);
Damien Millerf6d9e222000-06-18 14:50:44 +10001527 success = 1;
Damien Miller5fab4b92002-02-05 12:15:07 +11001528 break;
Damien Millerf6d9e222000-06-18 14:50:44 +10001529 }
1530 }
1531
1532 if (!success)
Damien Millerbaa08702002-02-05 12:14:10 +11001533 log("subsystem request for %.100s failed, subsystem not found",
Damien Millerae452462001-10-10 15:08:06 +10001534 subsys);
Damien Millerf6d9e222000-06-18 14:50:44 +10001535
Damien Millerbd483e72000-04-30 10:00:53 +10001536 xfree(subsys);
1537 return success;
1538}
1539
Ben Lindstrombba81212001-06-25 05:01:22 +00001540static int
Damien Millerbd483e72000-04-30 10:00:53 +10001541session_x11_req(Session *s)
1542{
Ben Lindstrom768176b2001-06-09 01:29:12 +00001543 int success;
Damien Millerbd483e72000-04-30 10:00:53 +10001544
1545 s->single_connection = packet_get_char();
1546 s->auth_proto = packet_get_string(NULL);
1547 s->auth_data = packet_get_string(NULL);
1548 s->screen = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001549 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10001550
Ben Lindstrom768176b2001-06-09 01:29:12 +00001551 success = session_setup_x11fwd(s);
1552 if (!success) {
Damien Millerbd483e72000-04-30 10:00:53 +10001553 xfree(s->auth_proto);
1554 xfree(s->auth_data);
Ben Lindstrom88259fb2001-06-12 00:21:34 +00001555 s->auth_proto = NULL;
1556 s->auth_data = NULL;
Damien Millerbd483e72000-04-30 10:00:53 +10001557 }
Ben Lindstrom768176b2001-06-09 01:29:12 +00001558 return success;
Damien Millerbd483e72000-04-30 10:00:53 +10001559}
1560
Ben Lindstrombba81212001-06-25 05:01:22 +00001561static int
Damien Millerf6d9e222000-06-18 14:50:44 +10001562session_shell_req(Session *s)
1563{
Damien Miller48b03fc2002-01-22 23:11:40 +11001564 packet_check_eom();
Ben Lindstromc85ab8a2001-06-21 03:13:10 +00001565 do_exec(s, NULL);
Damien Millerf6d9e222000-06-18 14:50:44 +10001566 return 1;
1567}
1568
Ben Lindstrombba81212001-06-25 05:01:22 +00001569static int
Damien Millerf6d9e222000-06-18 14:50:44 +10001570session_exec_req(Session *s)
1571{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001572 u_int len;
Damien Millerf6d9e222000-06-18 14:50:44 +10001573 char *command = packet_get_string(&len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001574 packet_check_eom();
Ben Lindstromc85ab8a2001-06-21 03:13:10 +00001575 do_exec(s, command);
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +00001576 xfree(command);
Damien Millerf6d9e222000-06-18 14:50:44 +10001577 return 1;
1578}
1579
Ben Lindstrombba81212001-06-25 05:01:22 +00001580static int
Damien Miller0bc1bd82000-11-13 22:57:25 +11001581session_auth_agent_req(Session *s)
1582{
1583 static int called = 0;
Damien Miller48b03fc2002-01-22 23:11:40 +11001584 packet_check_eom();
Ben Lindstrom14920292000-11-21 21:24:55 +00001585 if (no_agent_forwarding_flag) {
1586 debug("session_auth_agent_req: no_agent_forwarding_flag");
1587 return 0;
1588 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001589 if (called) {
1590 return 0;
1591 } else {
1592 called = 1;
1593 return auth_input_request_forwarding(s->pw);
1594 }
1595}
1596
Damien Millerc7ef63d2002-02-05 12:21:42 +11001597int
1598session_input_channel_req(Channel *c, const char *rtype)
Damien Millerefb4afe2000-04-12 18:45:05 +10001599{
Damien Millerefb4afe2000-04-12 18:45:05 +10001600 int success = 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001601 Session *s;
Damien Millerefb4afe2000-04-12 18:45:05 +10001602
Damien Millerc7ef63d2002-02-05 12:21:42 +11001603 if ((s = session_by_channel(c->self)) == NULL) {
1604 log("session_input_channel_req: no session %d req %.100s",
1605 c->self, rtype);
1606 return 0;
1607 }
1608 debug("session_input_channel_req: session %d req %s", s->self, rtype);
Damien Millerefb4afe2000-04-12 18:45:05 +10001609
1610 /*
Ben Lindstromfc9b07d2001-03-22 01:27:23 +00001611 * a session is in LARVAL state until a shell, a command
1612 * or a subsystem is executed
Damien Millerefb4afe2000-04-12 18:45:05 +10001613 */
1614 if (c->type == SSH_CHANNEL_LARVAL) {
1615 if (strcmp(rtype, "shell") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10001616 success = session_shell_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001617 } else if (strcmp(rtype, "exec") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10001618 success = session_exec_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001619 } else if (strcmp(rtype, "pty-req") == 0) {
Damien Miller5f056372000-04-16 12:31:48 +10001620 success = session_pty_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10001621 } else if (strcmp(rtype, "x11-req") == 0) {
1622 success = session_x11_req(s);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001623 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1624 success = session_auth_agent_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10001625 } else if (strcmp(rtype, "subsystem") == 0) {
1626 success = session_subsystem_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001627 }
1628 }
1629 if (strcmp(rtype, "window-change") == 0) {
1630 success = session_window_change_req(s);
1631 }
Damien Millerc7ef63d2002-02-05 12:21:42 +11001632 return success;
Damien Millerefb4afe2000-04-12 18:45:05 +10001633}
1634
1635void
1636session_set_fds(Session *s, int fdin, int fdout, int fderr)
1637{
1638 if (!compat20)
1639 fatal("session_set_fds: called for proto != 2.0");
1640 /*
1641 * now that have a child and a pipe to the child,
1642 * we can activate our channel and register the fd's
1643 */
1644 if (s->chanid == -1)
1645 fatal("no channel for session %d", s->self);
1646 channel_set_fds(s->chanid,
1647 fdout, fdin, fderr,
Damien Miller69b69aa2000-10-28 14:19:58 +11001648 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
Damien Miller19a59452002-02-19 15:20:57 +11001649 1,
1650 CHAN_SES_WINDOW_DEFAULT);
Damien Millerefb4afe2000-04-12 18:45:05 +10001651}
1652
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001653/*
1654 * Function to perform pty cleanup. Also called if we get aborted abnormally
1655 * (e.g., due to a dropped connection).
1656 */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001657void
1658session_pty_cleanup2(void *session)
Damien Millerb38eff82000-04-01 11:09:21 +10001659{
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001660 Session *s = session;
1661
1662 if (s == NULL) {
1663 error("session_pty_cleanup: no session");
1664 return;
1665 }
1666 if (s->ttyfd == -1)
Damien Millerb38eff82000-04-01 11:09:21 +10001667 return;
1668
Kevin Steves43cdef32001-02-11 14:12:08 +00001669 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
Damien Millerb38eff82000-04-01 11:09:21 +10001670
Damien Millerb38eff82000-04-01 11:09:21 +10001671 /* Record that the user has logged out. */
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001672 if (s->pid != 0)
Tim Ricee06ae4a2002-02-24 17:56:46 -08001673 record_logout(s->pid, s->tty, s->pw->pw_name);
Damien Millerb38eff82000-04-01 11:09:21 +10001674
1675 /* Release the pseudo-tty. */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001676 if (getuid() == 0)
1677 pty_release(s->tty);
Damien Millerb38eff82000-04-01 11:09:21 +10001678
1679 /*
1680 * Close the server side of the socket pairs. We must do this after
1681 * the pty cleanup, so that another process doesn't get this pty
1682 * while we're still cleaning up.
1683 */
1684 if (close(s->ptymaster) < 0)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001685 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
Damien Miller0585d512001-10-12 11:35:50 +10001686
1687 /* unlink pty from session */
1688 s->ttyfd = -1;
Damien Millerb38eff82000-04-01 11:09:21 +10001689}
Damien Millerefb4afe2000-04-12 18:45:05 +10001690
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001691void
1692session_pty_cleanup(void *session)
1693{
1694 PRIVSEP(session_pty_cleanup2(session));
1695}
1696
Ben Lindstrombba81212001-06-25 05:01:22 +00001697static void
Damien Millerefb4afe2000-04-12 18:45:05 +10001698session_exit_message(Session *s, int status)
1699{
1700 Channel *c;
Damien Millerf3dcf1f2002-02-08 22:06:48 +11001701
1702 if ((c = channel_lookup(s->chanid)) == NULL)
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001703 fatal("session_exit_message: session %d: no channel %d",
Damien Millerefb4afe2000-04-12 18:45:05 +10001704 s->self, s->chanid);
1705 debug("session_exit_message: session %d channel %d pid %d",
1706 s->self, s->chanid, s->pid);
1707
1708 if (WIFEXITED(status)) {
Damien Millerf3dcf1f2002-02-08 22:06:48 +11001709 channel_request_start(s->chanid, "exit-status", 0);
Damien Millerefb4afe2000-04-12 18:45:05 +10001710 packet_put_int(WEXITSTATUS(status));
1711 packet_send();
1712 } else if (WIFSIGNALED(status)) {
Damien Millerf3dcf1f2002-02-08 22:06:48 +11001713 channel_request_start(s->chanid, "exit-signal", 0);
Damien Millerefb4afe2000-04-12 18:45:05 +10001714 packet_put_int(WTERMSIG(status));
Damien Millerf3c6cf12000-05-17 22:08:29 +10001715#ifdef WCOREDUMP
Damien Millerefb4afe2000-04-12 18:45:05 +10001716 packet_put_char(WCOREDUMP(status));
Damien Millerf3c6cf12000-05-17 22:08:29 +10001717#else /* WCOREDUMP */
1718 packet_put_char(0);
1719#endif /* WCOREDUMP */
Damien Millerefb4afe2000-04-12 18:45:05 +10001720 packet_put_cstring("");
1721 packet_put_cstring("");
1722 packet_send();
1723 } else {
1724 /* Some weird exit cause. Just exit. */
1725 packet_disconnect("wait returned status %04x.", status);
1726 }
1727
1728 /* disconnect channel */
1729 debug("session_exit_message: release channel %d", s->chanid);
1730 channel_cancel_cleanup(s->chanid);
Damien Miller166fca82000-04-20 07:42:21 +10001731 /*
1732 * emulate a write failure with 'chan_write_failed', nobody will be
1733 * interested in data we write.
1734 * Note that we must not call 'chan_read_failed', since there could
1735 * be some more data waiting in the pipe.
1736 */
Damien Millerbd483e72000-04-30 10:00:53 +10001737 if (c->ostate != CHAN_OUTPUT_CLOSED)
1738 chan_write_failed(c);
Damien Millerefb4afe2000-04-12 18:45:05 +10001739 s->chanid = -1;
1740}
1741
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001742void
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001743session_close(Session *s)
Damien Millerefb4afe2000-04-12 18:45:05 +10001744{
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001745 debug("session_close: session %d pid %d", s->self, s->pid);
1746 if (s->ttyfd != -1) {
1747 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1748 session_pty_cleanup(s);
1749 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001750 if (s->term)
1751 xfree(s->term);
1752 if (s->display)
1753 xfree(s->display);
Damien Miller512bccb2002-02-05 12:11:02 +11001754 if (s->auth_display)
1755 xfree(s->auth_display);
Damien Millerefb4afe2000-04-12 18:45:05 +10001756 if (s->auth_data)
1757 xfree(s->auth_data);
1758 if (s->auth_proto)
1759 xfree(s->auth_proto);
1760 s->used = 0;
Damien Millere247cc42000-05-07 12:03:14 +10001761 session_proctitle(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001762}
1763
1764void
1765session_close_by_pid(pid_t pid, int status)
1766{
1767 Session *s = session_by_pid(pid);
1768 if (s == NULL) {
Ben Lindstrom7a837222001-06-13 19:23:32 +00001769 debug("session_close_by_pid: no session for pid %d", pid);
Damien Millerefb4afe2000-04-12 18:45:05 +10001770 return;
1771 }
1772 if (s->chanid != -1)
1773 session_exit_message(s, status);
1774 session_close(s);
1775}
1776
1777/*
1778 * this is called when a channel dies before
1779 * the session 'child' itself dies
1780 */
1781void
1782session_close_by_channel(int id, void *arg)
1783{
1784 Session *s = session_by_channel(id);
1785 if (s == NULL) {
Damien Miller3ec27592001-10-12 11:35:04 +10001786 debug("session_close_by_channel: no session for id %d", id);
Damien Millerefb4afe2000-04-12 18:45:05 +10001787 return;
1788 }
Damien Miller3ec27592001-10-12 11:35:04 +10001789 debug("session_close_by_channel: channel %d child %d", id, s->pid);
1790 if (s->pid != 0) {
Damien Miller3ec27592001-10-12 11:35:04 +10001791 debug("session_close_by_channel: channel %d: has child", id);
Damien Miller0585d512001-10-12 11:35:50 +10001792 /*
1793 * delay detach of session, but release pty, since
1794 * the fd's to the child are already closed
1795 */
1796 if (s->ttyfd != -1) {
1797 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1798 session_pty_cleanup(s);
1799 }
Damien Miller3ec27592001-10-12 11:35:04 +10001800 return;
1801 }
1802 /* detach by removing callback */
Damien Millerefb4afe2000-04-12 18:45:05 +10001803 channel_cancel_cleanup(s->chanid);
1804 s->chanid = -1;
Damien Miller52b77be2001-10-10 15:14:37 +10001805 session_close(s);
1806}
1807
1808void
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001809session_destroy_all(void (*closefunc)(Session *))
Damien Miller52b77be2001-10-10 15:14:37 +10001810{
1811 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001812 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Miller52b77be2001-10-10 15:14:37 +10001813 Session *s = &sessions[i];
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001814 if (s->used) {
1815 if (closefunc != NULL)
1816 closefunc(s);
1817 else
1818 session_close(s);
1819 }
Damien Miller52b77be2001-10-10 15:14:37 +10001820 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001821}
1822
Ben Lindstrombba81212001-06-25 05:01:22 +00001823static char *
Damien Millere247cc42000-05-07 12:03:14 +10001824session_tty_list(void)
1825{
1826 static char buf[1024];
1827 int i;
1828 buf[0] = '\0';
Damien Miller9f0f5c62001-12-21 14:45:46 +11001829 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millere247cc42000-05-07 12:03:14 +10001830 Session *s = &sessions[i];
1831 if (s->used && s->ttyfd != -1) {
1832 if (buf[0] != '\0')
1833 strlcat(buf, ",", sizeof buf);
1834 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1835 }
1836 }
1837 if (buf[0] == '\0')
1838 strlcpy(buf, "notty", sizeof buf);
1839 return buf;
1840}
1841
1842void
1843session_proctitle(Session *s)
1844{
1845 if (s->pw == NULL)
1846 error("no user for session %d", s->self);
1847 else
1848 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1849}
1850
Ben Lindstrom768176b2001-06-09 01:29:12 +00001851int
1852session_setup_x11fwd(Session *s)
1853{
Ben Lindstrom768176b2001-06-09 01:29:12 +00001854 struct stat st;
Kevin Steves366298c2001-12-19 17:58:01 +00001855 char display[512], auth_display[512];
1856 char hostname[MAXHOSTNAMELEN];
Ben Lindstrom768176b2001-06-09 01:29:12 +00001857
1858 if (no_x11_forwarding_flag) {
1859 packet_send_debug("X11 forwarding disabled in user configuration file.");
1860 return 0;
1861 }
1862 if (!options.x11_forwarding) {
1863 debug("X11 forwarding disabled in server configuration file.");
1864 return 0;
1865 }
1866 if (!options.xauth_location ||
1867 (stat(options.xauth_location, &st) == -1)) {
1868 packet_send_debug("No xauth program; cannot forward with spoofing.");
1869 return 0;
1870 }
Ben Lindstrom699776e2001-06-21 03:14:49 +00001871 if (options.use_login) {
1872 packet_send_debug("X11 forwarding disabled; "
1873 "not compatible with UseLogin=yes.");
1874 return 0;
1875 }
Ben Lindstrom2bcdf062001-06-13 04:41:41 +00001876 if (s->display != NULL) {
Ben Lindstrom768176b2001-06-09 01:29:12 +00001877 debug("X11 display already set.");
1878 return 0;
1879 }
Kevin Steves366298c2001-12-19 17:58:01 +00001880 s->display_number = x11_create_display_inet(options.x11_display_offset,
Damien Miller95c249f2002-02-05 12:11:34 +11001881 options.x11_use_localhost, s->single_connection);
Kevin Steves366298c2001-12-19 17:58:01 +00001882 if (s->display_number == -1) {
Ben Lindstrom2bcdf062001-06-13 04:41:41 +00001883 debug("x11_create_display_inet failed.");
Ben Lindstrom768176b2001-06-09 01:29:12 +00001884 return 0;
1885 }
Kevin Steves366298c2001-12-19 17:58:01 +00001886
1887 /* Set up a suitable value for the DISPLAY variable. */
1888 if (gethostname(hostname, sizeof(hostname)) < 0)
1889 fatal("gethostname: %.100s", strerror(errno));
1890 /*
1891 * auth_display must be used as the displayname when the
1892 * authorization entry is added with xauth(1). This will be
1893 * different than the DISPLAY string for localhost displays.
1894 */
Damien Miller95c249f2002-02-05 12:11:34 +11001895 if (options.x11_use_localhost) {
Kevin Steves366298c2001-12-19 17:58:01 +00001896 snprintf(display, sizeof display, "localhost:%d.%d",
1897 s->display_number, s->screen);
Damien Miller512bccb2002-02-05 12:11:02 +11001898 snprintf(auth_display, sizeof auth_display, "unix:%d.%d",
1899 s->display_number, s->screen);
Kevin Steves366298c2001-12-19 17:58:01 +00001900 s->display = xstrdup(display);
Damien Miller512bccb2002-02-05 12:11:02 +11001901 s->auth_display = xstrdup(auth_display);
Kevin Steves366298c2001-12-19 17:58:01 +00001902 } else {
1903#ifdef IPADDR_IN_DISPLAY
1904 struct hostent *he;
1905 struct in_addr my_addr;
1906
1907 he = gethostbyname(hostname);
1908 if (he == NULL) {
1909 error("Can't get IP address for X11 DISPLAY.");
1910 packet_send_debug("Can't get IP address for X11 DISPLAY.");
1911 return 0;
1912 }
1913 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
1914 snprintf(display, sizeof display, "%.50s:%d.%d", inet_ntoa(my_addr),
1915 s->display_number, s->screen);
1916#else
1917 snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
1918 s->display_number, s->screen);
1919#endif
1920 s->display = xstrdup(display);
Damien Miller512bccb2002-02-05 12:11:02 +11001921 s->auth_display = xstrdup(display);
Kevin Steves366298c2001-12-19 17:58:01 +00001922 }
1923
Ben Lindstrom768176b2001-06-09 01:29:12 +00001924 return 1;
1925}
1926
Ben Lindstrombba81212001-06-25 05:01:22 +00001927static void
Ben Lindstromdb65e8f2001-01-19 04:26:52 +00001928do_authenticated2(Authctxt *authctxt)
Damien Millerefb4afe2000-04-12 18:45:05 +10001929{
Ben Lindstrombddd5512001-07-04 04:53:53 +00001930 server_loop2(authctxt);
Damien Millerefb4afe2000-04-12 18:45:05 +10001931}