blob: 69153ad1e3148e19b24e83d90f8fd7568ec9808c [file] [log] [blame]
Damien Miller990b1a82006-10-24 03:01:56 +10001/* $OpenBSD: session.c,v 1.220 2006/10/09 23:36:11 djm Exp $ */
Damien Millerb38eff82000-04-01 11:09:21 +10002/*
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Millere4340be2000-09-16 13:29:08 +11005 *
6 * As far as I am concerned, the code I have written for this software
7 * can be used freely for any purpose. Any derived versions of this
8 * software must be clearly marked as such, and if the derived work is
9 * incompatible with the protocol description in the RFC file, it must be
10 * called by a name other than "ssh" or "Secure Shell".
11 *
Damien Millerefb4afe2000-04-12 18:45:05 +100012 * SSH2 support by Markus Friedl.
Ben Lindstrom44697232001-07-04 03:32:30 +000013 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110014 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Millerefb4afe2000-04-12 18:45:05 +100034 */
Damien Millerb38eff82000-04-01 11:09:21 +100035
36#include "includes.h"
Damien Miller9cf6d072006-03-15 11:29:24 +110037
38#include <sys/types.h>
Damien Miller8dbffe72006-08-05 11:02:17 +100039#include <sys/param.h>
Damien Millerf17883e2006-03-15 11:45:54 +110040#ifdef HAVE_SYS_STAT_H
41# include <sys/stat.h>
42#endif
Damien Millere3b60b52006-07-10 21:08:03 +100043#include <sys/socket.h>
Damien Miller574c41f2006-03-15 11:40:10 +110044#include <sys/un.h>
Damien Miller8dbffe72006-08-05 11:02:17 +100045#include <sys/wait.h>
Damien Miller03e20032006-03-15 11:16:59 +110046
Damien Miller1cdde6f2006-07-24 14:07:35 +100047#include <arpa/inet.h>
48
Darren Tucker39972492006-07-12 22:22:46 +100049#include <errno.h>
Damien Miller427a1d52006-07-10 20:20:33 +100050#include <grp.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110051#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110052#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110053#endif
Damien Miller9f2abc42006-07-10 20:53:08 +100054#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110055#include <signal.h>
Damien Millerded319c2006-09-01 15:38:36 +100056#include <stdarg.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100057#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100058#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100059#include <string.h>
Damien Miller1cdde6f2006-07-24 14:07:35 +100060#include <unistd.h>
Damien Millerb38eff82000-04-01 11:09:21 +100061
Damien Millerd7834352006-08-05 12:39:39 +100062#include "xmalloc.h"
Damien Millerb38eff82000-04-01 11:09:21 +100063#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000064#include "ssh1.h"
65#include "ssh2.h"
Ben Lindstromd95c09c2001-02-18 19:13:33 +000066#include "sshpty.h"
Damien Millerb38eff82000-04-01 11:09:21 +100067#include "packet.h"
68#include "buffer.h"
Darren Tucker46bc0752004-05-02 22:11:30 +100069#include "match.h"
Damien Millerb38eff82000-04-01 11:09:21 +100070#include "uidswap.h"
71#include "compat.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000072#include "channels.h"
Damien Millerd7834352006-08-05 12:39:39 +100073#include "key.h"
74#include "cipher.h"
75#ifdef GSSAPI
76#include "ssh-gss.h"
77#endif
78#include "hostfile.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100079#include "auth.h"
Damien Millerf6d9e222000-06-18 14:50:44 +100080#include "auth-options.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000081#include "pathnames.h"
82#include "log.h"
83#include "servconf.h"
Ben Lindstromd95c09c2001-02-18 19:13:33 +000084#include "sshlogin.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000085#include "serverloop.h"
86#include "canohost.h"
Ben Lindstrom31ca54a2001-02-09 02:11:24 +000087#include "session.h"
Damien Miller9786e6e2005-07-26 21:54:56 +100088#include "kex.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000089#include "monitor_wrap.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100090
Darren Tucker3c78c5e2004-01-23 22:03:10 +110091#if defined(KRB5) && defined(USE_AFS)
Damien Miller8f341f82004-01-21 11:00:46 +110092#include <kafs.h>
93#endif
94
Damien Millerb38eff82000-04-01 11:09:21 +100095/* func */
96
97Session *session_new(void);
Kevin Steves8f63caa2001-07-04 18:23:02 +000098void session_set_fds(Session *, int, int, int);
Darren Tucker3e33cec2003-10-02 16:12:36 +100099void session_pty_cleanup(Session *);
Kevin Steves8f63caa2001-07-04 18:23:02 +0000100void session_proctitle(Session *);
101int session_setup_x11fwd(Session *);
102void do_exec_pty(Session *, const char *);
103void do_exec_no_pty(Session *, const char *);
104void do_exec(Session *, const char *);
105void do_login(Session *, const char *);
Kevin Stevesa0957d62001-09-27 19:50:26 +0000106#ifdef LOGIN_NEEDS_UTMPX
107static void do_pre_login(Session *s);
108#endif
Kevin Steves8f63caa2001-07-04 18:23:02 +0000109void do_child(Session *, const char *);
Damien Millercf205e82001-04-16 18:29:15 +1000110void do_motd(void);
Kevin Steves8f63caa2001-07-04 18:23:02 +0000111int check_quietlogin(Session *, const char *);
Damien Millerb38eff82000-04-01 11:09:21 +1000112
Ben Lindstrombba81212001-06-25 05:01:22 +0000113static void do_authenticated1(Authctxt *);
114static void do_authenticated2(Authctxt *);
Kevin Steves8f63caa2001-07-04 18:23:02 +0000115
Ben Lindstrombba81212001-06-25 05:01:22 +0000116static int session_pty_req(Session *);
Ben Lindstromb31783d2001-03-22 02:02:12 +0000117
Damien Millerb38eff82000-04-01 11:09:21 +1000118/* import */
119extern ServerOptions options;
120extern char *__progname;
121extern int log_stderr;
122extern int debug_flag;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000123extern u_int utmp_len;
Damien Miller37023962000-07-11 17:31:38 +1000124extern int startup_pipe;
Ben Lindstrom005dd222001-04-18 15:29:33 +0000125extern void destroy_sensitive_data(void);
Darren Tuckerb9aa0a02003-07-08 22:59:59 +1000126extern Buffer loginmsg;
Damien Miller37023962000-07-11 17:31:38 +1000127
Damien Miller7b28dc52000-09-05 13:34:53 +1100128/* original command from peer. */
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000129const char *original_command = NULL;
Damien Miller7b28dc52000-09-05 13:34:53 +1100130
Damien Millerb38eff82000-04-01 11:09:21 +1000131/* data */
132#define MAX_SESSIONS 10
133Session sessions[MAX_SESSIONS];
Damien Miller15e7d4b2000-09-29 10:57:35 +1100134
Damien Millerad833b32000-08-23 10:46:23 +1000135#ifdef HAVE_LOGIN_CAP
Ben Lindstromb481e132002-03-22 01:35:47 +0000136login_cap_t *lc;
Damien Millerad833b32000-08-23 10:46:23 +1000137#endif
138
Darren Tucker3e33cec2003-10-02 16:12:36 +1000139static int is_child = 0;
140
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000141/* Name and directory of socket for authentication agent forwarding. */
142static char *auth_sock_name = NULL;
143static char *auth_sock_dir = NULL;
144
145/* removes the agent forwarding socket */
146
147static void
Darren Tucker3e33cec2003-10-02 16:12:36 +1000148auth_sock_cleanup_proc(struct passwd *pw)
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000149{
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000150 if (auth_sock_name != NULL) {
151 temporarily_use_uid(pw);
152 unlink(auth_sock_name);
153 rmdir(auth_sock_dir);
154 auth_sock_name = NULL;
155 restore_uid();
156 }
157}
158
159static int
160auth_input_request_forwarding(struct passwd * pw)
161{
162 Channel *nc;
163 int sock;
164 struct sockaddr_un sunaddr;
165
166 if (auth_sock_name != NULL) {
167 error("authentication forwarding requested twice.");
168 return 0;
169 }
170
171 /* Temporarily drop privileged uid for mkdir/bind. */
172 temporarily_use_uid(pw);
173
174 /* Allocate a buffer for the socket name, and format the name. */
175 auth_sock_name = xmalloc(MAXPATHLEN);
176 auth_sock_dir = xmalloc(MAXPATHLEN);
Darren Tucker072a7b12003-10-15 16:10:25 +1000177 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000178
179 /* Create private directory for socket */
180 if (mkdtemp(auth_sock_dir) == NULL) {
181 packet_send_debug("Agent forwarding disabled: "
182 "mkdtemp() failed: %.100s", strerror(errno));
183 restore_uid();
184 xfree(auth_sock_name);
185 xfree(auth_sock_dir);
186 auth_sock_name = NULL;
187 auth_sock_dir = NULL;
188 return 0;
189 }
Ben Lindstromce0f6342002-06-11 16:42:49 +0000190 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
191 auth_sock_dir, (long) getpid());
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000192
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000193 /* Create the socket. */
194 sock = socket(AF_UNIX, SOCK_STREAM, 0);
195 if (sock < 0)
196 packet_disconnect("socket: %.100s", strerror(errno));
197
198 /* Bind it to the name. */
199 memset(&sunaddr, 0, sizeof(sunaddr));
200 sunaddr.sun_family = AF_UNIX;
201 strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
202
Damien Miller90967402006-03-26 14:07:26 +1100203 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0)
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000204 packet_disconnect("bind: %.100s", strerror(errno));
205
206 /* Restore the privileged uid. */
207 restore_uid();
208
209 /* Start listening on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +1100210 if (listen(sock, SSH_LISTEN_BACKLOG) < 0)
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000211 packet_disconnect("listen: %.100s", strerror(errno));
212
213 /* Allocate a channel for the authentication agent socket. */
214 nc = channel_new("auth socket",
215 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
216 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000217 0, "auth socket", 1);
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000218 strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
219 return 1;
220}
221
Darren Tucker1921ed92004-02-10 13:23:28 +1100222static void
223display_loginmsg(void)
224{
Damien Miller46d38de2005-07-17 17:02:09 +1000225 if (buffer_len(&loginmsg) > 0) {
226 buffer_append(&loginmsg, "\0", 1);
227 printf("%s", (char *)buffer_ptr(&loginmsg));
228 buffer_clear(&loginmsg);
229 }
Darren Tucker1921ed92004-02-10 13:23:28 +1100230}
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000231
Ben Lindstromb31783d2001-03-22 02:02:12 +0000232void
233do_authenticated(Authctxt *authctxt)
234{
Damien Miller97f39ae2003-02-24 11:57:01 +1100235 setproctitle("%s", authctxt->pw->pw_name);
236
Ben Lindstromb31783d2001-03-22 02:02:12 +0000237 /* setup the channel layer */
238 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
239 channel_permit_all_opens();
240
241 if (compat20)
242 do_authenticated2(authctxt);
243 else
244 do_authenticated1(authctxt);
Ben Lindstrom838394c2001-06-09 01:11:59 +0000245
Darren Tucker3e33cec2003-10-02 16:12:36 +1000246 do_cleanup(authctxt);
Ben Lindstromb31783d2001-03-22 02:02:12 +0000247}
248
Damien Millerb38eff82000-04-01 11:09:21 +1000249/*
Damien Millerb38eff82000-04-01 11:09:21 +1000250 * Prepares for an interactive session. This is called after the user has
251 * been successfully authenticated. During this message exchange, pseudo
252 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
253 * are requested, etc.
254 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000255static void
Ben Lindstromb31783d2001-03-22 02:02:12 +0000256do_authenticated1(Authctxt *authctxt)
Damien Millerb38eff82000-04-01 11:09:21 +1000257{
258 Session *s;
Damien Millerb38eff82000-04-01 11:09:21 +1000259 char *command;
Damien Millerdff50992002-01-22 23:16:32 +1100260 int success, type, screen_flag;
Ben Lindstrome23f4a32002-06-23 21:40:16 +0000261 int enable_compression_after_reply = 0;
262 u_int proto_len, data_len, dlen, compression_level = 0;
Damien Millerb38eff82000-04-01 11:09:21 +1000263
264 s = session_new();
Darren Tucker172a5e82005-01-20 10:55:46 +1100265 if (s == NULL) {
266 error("no more sessions");
267 return;
268 }
Ben Lindstromec95ed92001-07-04 04:21:14 +0000269 s->authctxt = authctxt;
Ben Lindstromb31783d2001-03-22 02:02:12 +0000270 s->pw = authctxt->pw;
Damien Millerad833b32000-08-23 10:46:23 +1000271
Damien Millerb38eff82000-04-01 11:09:21 +1000272 /*
273 * We stay in this loop until the client requests to execute a shell
274 * or a command.
275 */
276 for (;;) {
Ben Lindstromb31783d2001-03-22 02:02:12 +0000277 success = 0;
Damien Millerb38eff82000-04-01 11:09:21 +1000278
279 /* Get a packet from the client. */
Damien Millerdff50992002-01-22 23:16:32 +1100280 type = packet_read();
Damien Millerb38eff82000-04-01 11:09:21 +1000281
282 /* Process the packet. */
283 switch (type) {
284 case SSH_CMSG_REQUEST_COMPRESSION:
Damien Millerb38eff82000-04-01 11:09:21 +1000285 compression_level = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +1100286 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +1000287 if (compression_level < 1 || compression_level > 9) {
Darren Tucker5cb30ad2004-08-12 22:40:24 +1000288 packet_send_debug("Received invalid compression level %d.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100289 compression_level);
Damien Millerb38eff82000-04-01 11:09:21 +1000290 break;
291 }
Damien Miller9786e6e2005-07-26 21:54:56 +1000292 if (options.compression == COMP_NONE) {
Ben Lindstrom23e0f662002-06-21 01:09:47 +0000293 debug2("compression disabled");
294 break;
295 }
Damien Millerb38eff82000-04-01 11:09:21 +1000296 /* Enable compression after we have responded with SUCCESS. */
297 enable_compression_after_reply = 1;
298 success = 1;
299 break;
300
301 case SSH_CMSG_REQUEST_PTY:
Ben Lindstrom49c12602001-06-13 04:37:36 +0000302 success = session_pty_req(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000303 break;
304
305 case SSH_CMSG_X11_REQUEST_FORWARDING:
Damien Millerb38eff82000-04-01 11:09:21 +1000306 s->auth_proto = packet_get_string(&proto_len);
307 s->auth_data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +1000308
Ben Lindstrom7603b2d2001-02-26 20:13:32 +0000309 screen_flag = packet_get_protocol_flags() &
310 SSH_PROTOFLAG_SCREEN_NUMBER;
311 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
312
313 if (packet_remaining() == 4) {
314 if (!screen_flag)
315 debug2("Buggy client: "
316 "X11 screen flag missing");
Damien Millerb38eff82000-04-01 11:09:21 +1000317 s->screen = packet_get_int();
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000318 } else {
Damien Millerb38eff82000-04-01 11:09:21 +1000319 s->screen = 0;
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000320 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100321 packet_check_eom();
Ben Lindstrom768176b2001-06-09 01:29:12 +0000322 success = session_setup_x11fwd(s);
323 if (!success) {
324 xfree(s->auth_proto);
325 xfree(s->auth_data);
Ben Lindstrom88259fb2001-06-12 00:21:34 +0000326 s->auth_proto = NULL;
327 s->auth_data = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +1000328 }
Damien Millerb38eff82000-04-01 11:09:21 +1000329 break;
Damien Millerb38eff82000-04-01 11:09:21 +1000330
331 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
332 if (no_agent_forwarding_flag || compat13) {
333 debug("Authentication agent forwarding not permitted for this authentication.");
334 break;
335 }
336 debug("Received authentication agent forwarding request.");
Ben Lindstromb31783d2001-03-22 02:02:12 +0000337 success = auth_input_request_forwarding(s->pw);
Damien Millerb38eff82000-04-01 11:09:21 +1000338 break;
339
340 case SSH_CMSG_PORT_FORWARD_REQUEST:
341 if (no_port_forwarding_flag) {
342 debug("Port forwarding not permitted for this authentication.");
343 break;
344 }
Damien Miller50a41ed2000-10-16 12:14:42 +1100345 if (!options.allow_tcp_forwarding) {
346 debug("Port forwarding not permitted.");
347 break;
348 }
Damien Millerb38eff82000-04-01 11:09:21 +1000349 debug("Received TCP/IP port forwarding request.");
Darren Tuckere7d4b192006-07-12 22:17:10 +1000350 if (channel_input_port_forward_request(s->pw->pw_uid == 0,
351 options.gateway_ports) < 0) {
352 debug("Port forwarding failed.");
353 break;
354 }
Damien Millerb38eff82000-04-01 11:09:21 +1000355 success = 1;
356 break;
357
358 case SSH_CMSG_MAX_PACKET_SIZE:
359 if (packet_set_maxsize(packet_get_int()) > 0)
360 success = 1;
361 break;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100362
Damien Millerb38eff82000-04-01 11:09:21 +1000363 case SSH_CMSG_EXEC_SHELL:
364 case SSH_CMSG_EXEC_CMD:
Damien Millerb38eff82000-04-01 11:09:21 +1000365 if (type == SSH_CMSG_EXEC_CMD) {
366 command = packet_get_string(&dlen);
367 debug("Exec command '%.500s'", command);
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000368 do_exec(s, command);
369 xfree(command);
Damien Millerb38eff82000-04-01 11:09:21 +1000370 } else {
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000371 do_exec(s, NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000372 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100373 packet_check_eom();
Ben Lindstromcb3929d2001-06-09 01:34:15 +0000374 session_close(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000375 return;
376
377 default:
378 /*
379 * Any unknown messages in this phase are ignored,
380 * and a failure message is returned.
381 */
Damien Miller996acd22003-04-09 20:59:48 +1000382 logit("Unknown packet type received after authentication: %d", type);
Damien Millerb38eff82000-04-01 11:09:21 +1000383 }
384 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
385 packet_send();
386 packet_write_wait();
387
388 /* Enable compression now that we have replied if appropriate. */
389 if (enable_compression_after_reply) {
390 enable_compression_after_reply = 0;
391 packet_start_compression(compression_level);
392 }
393 }
394}
395
396/*
397 * This is called to fork and execute a command when we have no tty. This
398 * will call do_child from the child, and server_loop from the parent after
399 * setting up file descriptors and such.
400 */
Damien Miller4af51302000-04-16 11:18:38 +1000401void
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000402do_exec_no_pty(Session *s, const char *command)
Damien Millerb38eff82000-04-01 11:09:21 +1000403{
Ben Lindstromce0f6342002-06-11 16:42:49 +0000404 pid_t pid;
Damien Millerb38eff82000-04-01 11:09:21 +1000405
406#ifdef USE_PIPES
407 int pin[2], pout[2], perr[2];
408 /* Allocate pipes for communicating with the program. */
409 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
410 packet_disconnect("Could not create pipes: %.100s",
411 strerror(errno));
412#else /* USE_PIPES */
413 int inout[2], err[2];
414 /* Uses socket pairs to communicate with the program. */
415 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
416 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
417 packet_disconnect("Could not create socket pairs: %.100s",
418 strerror(errno));
419#endif /* USE_PIPES */
420 if (s == NULL)
421 fatal("do_exec_no_pty: no session");
422
Damien Millere247cc42000-05-07 12:03:14 +1000423 session_proctitle(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000424
Damien Millerc5946332001-02-28 11:46:11 +1100425#if defined(USE_PAM)
Darren Tucker1825f262004-02-24 00:01:27 +1100426 if (options.use_pam && !use_privsep)
Damien Miller4e448a32003-05-14 15:11:48 +1000427 do_pam_setcred(1);
Kevin Stevesff793a22001-02-21 16:36:51 +0000428#endif /* USE_PAM */
429
Damien Millerb38eff82000-04-01 11:09:21 +1000430 /* Fork the child. */
431 if ((pid = fork()) == 0) {
Darren Tucker3e33cec2003-10-02 16:12:36 +1000432 is_child = 1;
Ben Lindstrom264ee302002-07-23 21:01:56 +0000433
Damien Millerb38eff82000-04-01 11:09:21 +1000434 /* Child. Reinitialize the log since the pid has changed. */
435 log_init(__progname, options.log_level, options.log_facility, log_stderr);
436
437 /*
438 * Create a new session and process group since the 4.4BSD
439 * setlogin() affects the entire process group.
440 */
441 if (setsid() < 0)
442 error("setsid failed: %.100s", strerror(errno));
443
444#ifdef USE_PIPES
445 /*
446 * Redirect stdin. We close the parent side of the socket
447 * pair, and make the child side the standard input.
448 */
449 close(pin[1]);
450 if (dup2(pin[0], 0) < 0)
451 perror("dup2 stdin");
452 close(pin[0]);
453
454 /* Redirect stdout. */
455 close(pout[0]);
456 if (dup2(pout[1], 1) < 0)
457 perror("dup2 stdout");
458 close(pout[1]);
459
460 /* Redirect stderr. */
461 close(perr[0]);
462 if (dup2(perr[1], 2) < 0)
463 perror("dup2 stderr");
464 close(perr[1]);
465#else /* USE_PIPES */
466 /*
467 * Redirect stdin, stdout, and stderr. Stdin and stdout will
468 * use the same socket, as some programs (particularly rdist)
469 * seem to depend on it.
470 */
471 close(inout[1]);
472 close(err[1]);
473 if (dup2(inout[0], 0) < 0) /* stdin */
474 perror("dup2 stdin");
475 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
476 perror("dup2 stdout");
477 if (dup2(err[0], 2) < 0) /* stderr */
478 perror("dup2 stderr");
479#endif /* USE_PIPES */
480
Tim Rice81ed5182002-09-25 17:38:46 -0700481#ifdef _UNICOS
482 cray_init_job(s->pw); /* set up cray jid and tmpdir */
483#endif
484
Damien Millerb38eff82000-04-01 11:09:21 +1000485 /* Do processing for the child (exec command etc). */
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000486 do_child(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000487 /* NOTREACHED */
488 }
Tim Rice81ed5182002-09-25 17:38:46 -0700489#ifdef _UNICOS
490 signal(WJSIGNAL, cray_job_termination_handler);
491#endif /* _UNICOS */
Damien Millerbac2d8a2000-09-05 16:13:06 +1100492#ifdef HAVE_CYGWIN
493 if (is_winnt)
494 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
495#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000496 if (pid < 0)
497 packet_disconnect("fork failed: %.100s", strerror(errno));
498 s->pid = pid;
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000499 /* Set interactive/non-interactive mode. */
500 packet_set_interactive(s->display != NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000501#ifdef USE_PIPES
502 /* We are the parent. Close the child sides of the pipes. */
503 close(pin[0]);
504 close(pout[1]);
505 close(perr[1]);
506
Damien Millerefb4afe2000-04-12 18:45:05 +1000507 if (compat20) {
Darren Tucker723e9452004-06-22 12:57:08 +1000508 if (s->is_subsystem) {
509 close(perr[0]);
510 perr[0] = -1;
511 }
512 session_set_fds(s, pin[1], pout[0], perr[0]);
Damien Millerefb4afe2000-04-12 18:45:05 +1000513 } else {
514 /* Enter the interactive session. */
515 server_loop(pid, pin[1], pout[0], perr[0]);
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000516 /* server_loop has closed pin[1], pout[0], and perr[0]. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000517 }
Damien Millerb38eff82000-04-01 11:09:21 +1000518#else /* USE_PIPES */
519 /* We are the parent. Close the child sides of the socket pairs. */
520 close(inout[0]);
521 close(err[0]);
522
523 /*
Darren Tuckerb3850592004-03-27 16:44:21 +1100524 * Clear loginmsg, since it's the child's responsibility to display
525 * it to the user, otherwise multiple sessions may accumulate
526 * multiple copies of the login messages.
527 */
528 buffer_clear(&loginmsg);
529
530 /*
Damien Millerb38eff82000-04-01 11:09:21 +1000531 * Enter the interactive session. Note: server_loop must be able to
532 * handle the case that fdin and fdout are the same.
533 */
Damien Millerefb4afe2000-04-12 18:45:05 +1000534 if (compat20) {
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000535 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
Damien Millerefb4afe2000-04-12 18:45:05 +1000536 } else {
537 server_loop(pid, inout[1], inout[1], err[1]);
538 /* server_loop has closed inout[1] and err[1]. */
539 }
Damien Millerb38eff82000-04-01 11:09:21 +1000540#endif /* USE_PIPES */
541}
542
543/*
544 * This is called to fork and execute a command when we have a tty. This
545 * will call do_child from the child, and server_loop from the parent after
546 * setting up file descriptors, controlling tty, updating wtmp, utmp,
547 * lastlog, and other such operations.
548 */
Damien Miller4af51302000-04-16 11:18:38 +1000549void
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000550do_exec_pty(Session *s, const char *command)
Damien Millerb38eff82000-04-01 11:09:21 +1000551{
Damien Millerb38eff82000-04-01 11:09:21 +1000552 int fdout, ptyfd, ttyfd, ptymaster;
Damien Millerb38eff82000-04-01 11:09:21 +1000553 pid_t pid;
Damien Millerb38eff82000-04-01 11:09:21 +1000554
555 if (s == NULL)
556 fatal("do_exec_pty: no session");
557 ptyfd = s->ptyfd;
558 ttyfd = s->ttyfd;
559
Damien Millerc5946332001-02-28 11:46:11 +1100560#if defined(USE_PAM)
Damien Miller4e448a32003-05-14 15:11:48 +1000561 if (options.use_pam) {
Damien Miller341c6e62003-09-02 23:18:52 +1000562 do_pam_set_tty(s->tty);
Darren Tuckeref3a4a22004-02-06 15:30:50 +1100563 if (!use_privsep)
564 do_pam_setcred(1);
Damien Miller4e448a32003-05-14 15:11:48 +1000565 }
Damien Miller5a761312001-02-27 09:28:23 +1100566#endif
Kevin Stevesff793a22001-02-21 16:36:51 +0000567
Damien Millerb38eff82000-04-01 11:09:21 +1000568 /* Fork the child. */
569 if ((pid = fork()) == 0) {
Darren Tucker3e33cec2003-10-02 16:12:36 +1000570 is_child = 1;
Ben Lindstrombddd5512001-07-04 04:53:53 +0000571
Damien Miller942da032000-08-18 13:59:06 +1000572 /* Child. Reinitialize the log because the pid has changed. */
Damien Millerb38eff82000-04-01 11:09:21 +1000573 log_init(__progname, options.log_level, options.log_facility, log_stderr);
Damien Millerb38eff82000-04-01 11:09:21 +1000574 /* Close the master side of the pseudo tty. */
575 close(ptyfd);
576
577 /* Make the pseudo tty our controlling tty. */
578 pty_make_controlling_tty(&ttyfd, s->tty);
579
Damien Miller9c751422001-10-10 15:02:46 +1000580 /* Redirect stdin/stdout/stderr from the pseudo tty. */
581 if (dup2(ttyfd, 0) < 0)
582 error("dup2 stdin: %s", strerror(errno));
583 if (dup2(ttyfd, 1) < 0)
584 error("dup2 stdout: %s", strerror(errno));
585 if (dup2(ttyfd, 2) < 0)
586 error("dup2 stderr: %s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +1000587
588 /* Close the extra descriptor for the pseudo tty. */
589 close(ttyfd);
590
Damien Miller942da032000-08-18 13:59:06 +1000591 /* record login, etc. similar to login(1) */
Damien Miller364a9bd2001-04-16 18:37:05 +1000592#ifndef HAVE_OSF_SIA
Tim Rice81ed5182002-09-25 17:38:46 -0700593 if (!(options.use_login && command == NULL)) {
594#ifdef _UNICOS
595 cray_init_job(s->pw); /* set up cray jid and tmpdir */
596#endif /* _UNICOS */
Damien Miller69b69aa2000-10-28 14:19:58 +1100597 do_login(s, command);
Tim Rice81ed5182002-09-25 17:38:46 -0700598 }
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000599# ifdef LOGIN_NEEDS_UTMPX
600 else
601 do_pre_login(s);
602# endif
Damien Miller364a9bd2001-04-16 18:37:05 +1000603#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000604
Damien Millerb38eff82000-04-01 11:09:21 +1000605 /* Do common processing for the child, such as execing the command. */
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000606 do_child(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000607 /* NOTREACHED */
608 }
Tim Rice81ed5182002-09-25 17:38:46 -0700609#ifdef _UNICOS
610 signal(WJSIGNAL, cray_job_termination_handler);
611#endif /* _UNICOS */
Damien Millerbac2d8a2000-09-05 16:13:06 +1100612#ifdef HAVE_CYGWIN
613 if (is_winnt)
614 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
615#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000616 if (pid < 0)
617 packet_disconnect("fork failed: %.100s", strerror(errno));
618 s->pid = pid;
619
620 /* Parent. Close the slave side of the pseudo tty. */
621 close(ttyfd);
622
623 /*
624 * Create another descriptor of the pty master side for use as the
625 * standard input. We could use the original descriptor, but this
626 * simplifies code in server_loop. The descriptor is bidirectional.
627 */
628 fdout = dup(ptyfd);
629 if (fdout < 0)
630 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
631
632 /* we keep a reference to the pty master */
633 ptymaster = dup(ptyfd);
634 if (ptymaster < 0)
635 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
636 s->ptymaster = ptymaster;
637
638 /* Enter interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000639 packet_set_interactive(1);
Damien Millerefb4afe2000-04-12 18:45:05 +1000640 if (compat20) {
641 session_set_fds(s, ptyfd, fdout, -1);
642 } else {
643 server_loop(pid, ptyfd, fdout, -1);
644 /* server_loop _has_ closed ptyfd and fdout. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000645 }
Damien Millerb38eff82000-04-01 11:09:21 +1000646}
647
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000648#ifdef LOGIN_NEEDS_UTMPX
Damien Miller599d8eb2001-09-15 12:25:53 +1000649static void
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000650do_pre_login(Session *s)
651{
652 socklen_t fromlen;
653 struct sockaddr_storage from;
654 pid_t pid = getpid();
655
656 /*
657 * Get IP address of client. If the connection is not a socket, let
658 * the address be 0.0.0.0.
659 */
660 memset(&from, 0, sizeof(from));
Damien Millerebc23062002-09-04 16:45:09 +1000661 fromlen = sizeof(from);
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000662 if (packet_connection_is_on_socket()) {
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000663 if (getpeername(packet_get_connection_in(),
Damien Miller90967402006-03-26 14:07:26 +1100664 (struct sockaddr *)&from, &fromlen) < 0) {
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000665 debug("getpeername: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +1000666 cleanup_exit(255);
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000667 }
668 }
669
670 record_utmp_only(pid, s->tty, s->pw->pw_name,
Damien Miller3a961dc2003-06-03 10:25:48 +1000671 get_remote_name_or_ip(utmp_len, options.use_dns),
Kevin Steves678ee512003-01-01 23:43:55 +0000672 (struct sockaddr *)&from, fromlen);
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000673}
674#endif
675
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000676/*
677 * This is called to fork and execute a command. If another command is
678 * to be forced, execute that instead.
679 */
680void
681do_exec(Session *s, const char *command)
682{
Damien Millere2754432006-07-24 14:06:47 +1000683 if (options.adm_forced_command) {
684 original_command = command;
685 command = options.adm_forced_command;
686 debug("Forced command (config) '%.900s'", command);
687 } else if (forced_command) {
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000688 original_command = command;
689 command = forced_command;
Damien Millere2754432006-07-24 14:06:47 +1000690 debug("Forced command (key option) '%.900s'", command);
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000691 }
692
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100693#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100694 if (command != NULL)
695 PRIVSEP(audit_run_command(command));
696 else if (s->ttyfd == -1) {
697 char *shell = s->pw->pw_shell;
698
699 if (shell[0] == '\0') /* empty shell means /bin/sh */
700 shell =_PATH_BSHELL;
701 PRIVSEP(audit_run_command(shell));
702 }
703#endif
704
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000705 if (s->ttyfd != -1)
706 do_exec_pty(s, command);
707 else
708 do_exec_no_pty(s, command);
709
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000710 original_command = NULL;
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000711
Darren Tucker09991742004-07-17 17:05:14 +1000712 /*
713 * Clear loginmsg: it's the child's responsibility to display
714 * it to the user, otherwise multiple sessions may accumulate
715 * multiple copies of the login messages.
716 */
717 buffer_clear(&loginmsg);
718}
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000719
Damien Miller942da032000-08-18 13:59:06 +1000720/* administrative, login(1)-like work */
721void
Damien Miller69b69aa2000-10-28 14:19:58 +1100722do_login(Session *s, const char *command)
Damien Miller942da032000-08-18 13:59:06 +1000723{
Damien Miller942da032000-08-18 13:59:06 +1000724 socklen_t fromlen;
725 struct sockaddr_storage from;
Damien Miller942da032000-08-18 13:59:06 +1000726 struct passwd * pw = s->pw;
727 pid_t pid = getpid();
728
729 /*
730 * Get IP address of client. If the connection is not a socket, let
731 * the address be 0.0.0.0.
732 */
733 memset(&from, 0, sizeof(from));
Kevin Steves678ee512003-01-01 23:43:55 +0000734 fromlen = sizeof(from);
Damien Miller942da032000-08-18 13:59:06 +1000735 if (packet_connection_is_on_socket()) {
Damien Miller942da032000-08-18 13:59:06 +1000736 if (getpeername(packet_get_connection_in(),
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000737 (struct sockaddr *) & from, &fromlen) < 0) {
Damien Miller942da032000-08-18 13:59:06 +1000738 debug("getpeername: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +1000739 cleanup_exit(255);
Damien Miller942da032000-08-18 13:59:06 +1000740 }
741 }
742
743 /* Record that there was a login on that tty from the remote host. */
Ben Lindstrom2bf56e22002-04-02 20:32:46 +0000744 if (!use_privsep)
745 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
746 get_remote_name_or_ip(utmp_len,
Damien Miller3a961dc2003-06-03 10:25:48 +1000747 options.use_dns),
Damien Millerebc23062002-09-04 16:45:09 +1000748 (struct sockaddr *)&from, fromlen);
Damien Miller942da032000-08-18 13:59:06 +1000749
Kevin Steves092f2ef2000-10-14 13:36:13 +0000750#ifdef USE_PAM
751 /*
752 * If password change is needed, do it now.
753 * This needs to occur before the ~/.hushlogin check.
754 */
Darren Tucker1921ed92004-02-10 13:23:28 +1100755 if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) {
756 display_loginmsg();
Kevin Steves092f2ef2000-10-14 13:36:13 +0000757 do_pam_chauthtok();
Darren Tucker1921ed92004-02-10 13:23:28 +1100758 s->authctxt->force_pwchange = 0;
Damien Miller1f499fd2003-08-25 13:08:49 +1000759 /* XXX - signal [net] parent to enable forwardings */
Kevin Steves092f2ef2000-10-14 13:36:13 +0000760 }
761#endif
762
Damien Millercf205e82001-04-16 18:29:15 +1000763 if (check_quietlogin(s, command))
Damien Miller942da032000-08-18 13:59:06 +1000764 return;
765
Darren Tucker1921ed92004-02-10 13:23:28 +1100766 display_loginmsg();
Damien Miller942da032000-08-18 13:59:06 +1000767
Damien Millercf205e82001-04-16 18:29:15 +1000768 do_motd();
769}
770
771/*
772 * Display the message of the day.
773 */
774void
775do_motd(void)
776{
777 FILE *f;
778 char buf[256];
779
Damien Miller942da032000-08-18 13:59:06 +1000780 if (options.print_motd) {
Damien Millerad833b32000-08-23 10:46:23 +1000781#ifdef HAVE_LOGIN_CAP
782 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
783 "/etc/motd"), "r");
784#else
Damien Miller942da032000-08-18 13:59:06 +1000785 f = fopen("/etc/motd", "r");
Damien Millerad833b32000-08-23 10:46:23 +1000786#endif
Damien Miller942da032000-08-18 13:59:06 +1000787 if (f) {
788 while (fgets(buf, sizeof(buf), f))
789 fputs(buf, stdout);
790 fclose(f);
791 }
792 }
793}
794
Kevin Steves8f63caa2001-07-04 18:23:02 +0000795
796/*
797 * Check for quiet login, either .hushlogin or command given.
798 */
799int
800check_quietlogin(Session *s, const char *command)
801{
802 char buf[256];
803 struct passwd *pw = s->pw;
804 struct stat st;
805
806 /* Return 1 if .hushlogin exists or a command given. */
807 if (command != NULL)
808 return 1;
809 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
810#ifdef HAVE_LOGIN_CAP
811 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
812 return 1;
813#else
814 if (stat(buf, &st) >= 0)
815 return 1;
816#endif
817 return 0;
818}
819
Damien Millerb38eff82000-04-01 11:09:21 +1000820/*
821 * Sets the value of the given variable in the environment. If the variable
822 * already exists, its value is overriden.
823 */
Darren Tucker0efd1552003-08-26 11:49:55 +1000824void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000825child_set_env(char ***envp, u_int *envsizep, const char *name,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100826 const char *value)
Damien Millerb38eff82000-04-01 11:09:21 +1000827{
Damien Millerb38eff82000-04-01 11:09:21 +1000828 char **env;
Darren Tuckerfb16b242003-09-22 21:04:23 +1000829 u_int envsize;
830 u_int i, namelen;
Damien Millerb38eff82000-04-01 11:09:21 +1000831
832 /*
Darren Tuckere1a790d2003-09-16 11:52:19 +1000833 * If we're passed an uninitialized list, allocate a single null
834 * entry before continuing.
835 */
836 if (*envp == NULL && *envsizep == 0) {
837 *envp = xmalloc(sizeof(char *));
838 *envp[0] = NULL;
839 *envsizep = 1;
840 }
841
842 /*
Damien Millerb38eff82000-04-01 11:09:21 +1000843 * Find the slot where the value should be stored. If the variable
844 * already exists, we reuse the slot; otherwise we append a new slot
845 * at the end of the array, expanding if necessary.
846 */
847 env = *envp;
848 namelen = strlen(name);
849 for (i = 0; env[i]; i++)
850 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
851 break;
852 if (env[i]) {
853 /* Reuse the slot. */
854 xfree(env[i]);
855 } else {
856 /* New variable. Expand if necessary. */
Darren Tuckerfb16b242003-09-22 21:04:23 +1000857 envsize = *envsizep;
858 if (i >= envsize - 1) {
859 if (envsize >= 1000)
860 fatal("child_set_env: too many env vars");
861 envsize += 50;
Damien Miller36812092006-03-26 14:22:47 +1100862 env = (*envp) = xrealloc(env, envsize, sizeof(char *));
Darren Tuckerfb16b242003-09-22 21:04:23 +1000863 *envsizep = envsize;
Damien Millerb38eff82000-04-01 11:09:21 +1000864 }
865 /* Need to set the NULL pointer at end of array beyond the new slot. */
866 env[i + 1] = NULL;
867 }
868
869 /* Allocate space and format the variable in the appropriate slot. */
870 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
871 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
872}
873
874/*
875 * Reads environment variables from the given file and adds/overrides them
876 * into the environment. If the file does not exist, this does nothing.
877 * Otherwise, it must consist of empty lines, comments (line starts with '#')
878 * and assignments of the form name=value. No other forms are allowed.
879 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000880static void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000881read_environment_file(char ***env, u_int *envsize,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100882 const char *filename)
Damien Millerb38eff82000-04-01 11:09:21 +1000883{
884 FILE *f;
885 char buf[4096];
886 char *cp, *value;
Damien Miller990070a2002-06-26 23:51:06 +1000887 u_int lineno = 0;
Damien Millerb38eff82000-04-01 11:09:21 +1000888
889 f = fopen(filename, "r");
890 if (!f)
891 return;
892
893 while (fgets(buf, sizeof(buf), f)) {
Damien Miller990070a2002-06-26 23:51:06 +1000894 if (++lineno > 1000)
895 fatal("Too many lines in environment file %s", filename);
Damien Millerb38eff82000-04-01 11:09:21 +1000896 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
897 ;
898 if (!*cp || *cp == '#' || *cp == '\n')
899 continue;
900 if (strchr(cp, '\n'))
901 *strchr(cp, '\n') = '\0';
902 value = strchr(cp, '=');
903 if (value == NULL) {
Damien Miller990070a2002-06-26 23:51:06 +1000904 fprintf(stderr, "Bad line %u in %.100s\n", lineno,
905 filename);
Damien Millerb38eff82000-04-01 11:09:21 +1000906 continue;
907 }
Damien Millerb1715dc2000-05-30 13:44:51 +1000908 /*
909 * Replace the equals sign by nul, and advance value to
910 * the value string.
911 */
Damien Millerb38eff82000-04-01 11:09:21 +1000912 *value = '\0';
913 value++;
914 child_set_env(env, envsize, cp, value);
915 }
916 fclose(f);
917}
918
Darren Tuckere1a790d2003-09-16 11:52:19 +1000919#ifdef HAVE_ETC_DEFAULT_LOGIN
920/*
921 * Return named variable from specified environment, or NULL if not present.
922 */
923static char *
924child_get_env(char **env, const char *name)
925{
926 int i;
927 size_t len;
928
929 len = strlen(name);
930 for (i=0; env[i] != NULL; i++)
931 if (strncmp(name, env[i], len) == 0 && env[i][len] == '=')
932 return(env[i] + len + 1);
933 return NULL;
934}
935
936/*
937 * Read /etc/default/login.
938 * We pick up the PATH (or SUPATH for root) and UMASK.
939 */
940static void
941read_etc_default_login(char ***env, u_int *envsize, uid_t uid)
942{
943 char **tmpenv = NULL, *var;
Darren Tuckerc11b1e82003-09-19 20:56:51 +1000944 u_int i, tmpenvsize = 0;
Darren Tuckerf391ba62003-10-02 20:07:09 +1000945 u_long mask;
Darren Tuckere1a790d2003-09-16 11:52:19 +1000946
947 /*
948 * We don't want to copy the whole file to the child's environment,
949 * so we use a temporary environment and copy the variables we're
950 * interested in.
951 */
952 read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login");
953
Darren Tuckerc11b1e82003-09-19 20:56:51 +1000954 if (tmpenv == NULL)
955 return;
956
Darren Tuckere1a790d2003-09-16 11:52:19 +1000957 if (uid == 0)
958 var = child_get_env(tmpenv, "SUPATH");
959 else
960 var = child_get_env(tmpenv, "PATH");
961 if (var != NULL)
962 child_set_env(env, envsize, "PATH", var);
Damien Miller787b2ec2003-11-21 23:56:47 +1100963
Darren Tuckere1a790d2003-09-16 11:52:19 +1000964 if ((var = child_get_env(tmpenv, "UMASK")) != NULL)
965 if (sscanf(var, "%5lo", &mask) == 1)
Darren Tuckerf391ba62003-10-02 20:07:09 +1000966 umask((mode_t)mask);
Damien Miller787b2ec2003-11-21 23:56:47 +1100967
Darren Tuckere1a790d2003-09-16 11:52:19 +1000968 for (i = 0; tmpenv[i] != NULL; i++)
969 xfree(tmpenv[i]);
970 xfree(tmpenv);
971}
972#endif /* HAVE_ETC_DEFAULT_LOGIN */
973
Damien Miller7dff8692005-05-26 11:34:51 +1000974void
975copy_environment(char **source, char ***env, u_int *envsize)
Damien Millerb38eff82000-04-01 11:09:21 +1000976{
Damien Millerbb9ffc12002-01-08 10:59:32 +1100977 char *var_name, *var_val;
Damien Millerb38eff82000-04-01 11:09:21 +1000978 int i;
979
Damien Millerbb9ffc12002-01-08 10:59:32 +1100980 if (source == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +1000981 return;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000982
Damien Millerbb9ffc12002-01-08 10:59:32 +1100983 for(i = 0; source[i] != NULL; i++) {
984 var_name = xstrdup(source[i]);
985 if ((var_val = strstr(var_name, "=")) == NULL) {
986 xfree(var_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000987 continue;
Damien Millerb38eff82000-04-01 11:09:21 +1000988 }
Damien Millerbb9ffc12002-01-08 10:59:32 +1100989 *var_val++ = '\0';
990
991 debug3("Copy environment: %s=%s", var_name, var_val);
992 child_set_env(env, envsize, var_name, var_val);
Damien Miller787b2ec2003-11-21 23:56:47 +1100993
Damien Millerbb9ffc12002-01-08 10:59:32 +1100994 xfree(var_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000995 }
996}
Damien Millercb5e44a2000-09-29 12:12:36 +1100997
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000998static char **
999do_setup_env(Session *s, const char *shell)
Damien Millerb38eff82000-04-01 11:09:21 +10001000{
Damien Millerb38eff82000-04-01 11:09:21 +10001001 char buf[256];
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001002 u_int i, envsize;
Damien Millerad5ecbf2006-07-24 15:03:06 +10001003 char **env, *laddr;
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001004 struct passwd *pw = s->pw;
Damien Millerad5ecbf2006-07-24 15:03:06 +10001005#ifndef HAVE_LOGIN_CAP
1006 char *path = NULL;
1007#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001008
Damien Millerb38eff82000-04-01 11:09:21 +10001009 /* Initialize the environment. */
1010 envsize = 100;
Darren Tuckerd8093e42006-05-04 16:24:34 +10001011 env = xcalloc(envsize, sizeof(char *));
Damien Millerb38eff82000-04-01 11:09:21 +10001012 env[0] = NULL;
1013
Damien Millerbac2d8a2000-09-05 16:13:06 +11001014#ifdef HAVE_CYGWIN
1015 /*
1016 * The Windows environment contains some setting which are
1017 * important for a running system. They must not be dropped.
1018 */
Darren Tucker14c372d2004-08-30 20:42:08 +10001019 {
1020 char **p;
1021
1022 p = fetch_windows_environment();
1023 copy_environment(p, &env, &envsize);
1024 free_windows_environment(p);
1025 }
Damien Millerbac2d8a2000-09-05 16:13:06 +11001026#endif
1027
Darren Tucker0efd1552003-08-26 11:49:55 +10001028#ifdef GSSAPI
Damien Millera8e06ce2003-11-21 23:48:55 +11001029 /* Allow any GSSAPI methods that we've used to alter
Darren Tucker0efd1552003-08-26 11:49:55 +10001030 * the childs environment as they see fit
1031 */
1032 ssh_gssapi_do_child(&env, &envsize);
1033#endif
1034
Damien Millerb38eff82000-04-01 11:09:21 +10001035 if (!options.use_login) {
1036 /* Set basic environment. */
Darren Tucker46bc0752004-05-02 22:11:30 +10001037 for (i = 0; i < s->num_env; i++)
Darren Tuckerfc959702004-07-17 16:12:08 +10001038 child_set_env(&env, &envsize, s->env[i].name,
Darren Tucker46bc0752004-05-02 22:11:30 +10001039 s->env[i].val);
1040
Damien Millerb38eff82000-04-01 11:09:21 +10001041 child_set_env(&env, &envsize, "USER", pw->pw_name);
1042 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
Damien Millerdfedbf82003-01-03 14:52:53 +11001043#ifdef _AIX
1044 child_set_env(&env, &envsize, "LOGIN", pw->pw_name);
1045#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001046 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
Damien Millerad833b32000-08-23 10:46:23 +10001047#ifdef HAVE_LOGIN_CAP
Ben Lindstromb9051ec2002-07-23 21:11:09 +00001048 if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
1049 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1050 else
1051 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
Damien Millercb5e44a2000-09-29 12:12:36 +11001052#else /* HAVE_LOGIN_CAP */
1053# ifndef HAVE_CYGWIN
Damien Millerbac2d8a2000-09-05 16:13:06 +11001054 /*
1055 * There's no standard path on Windows. The path contains
1056 * important components pointing to the system directories,
1057 * needed for loading shared libraries. So the path better
1058 * remains intact here.
1059 */
Darren Tuckere1a790d2003-09-16 11:52:19 +10001060# ifdef HAVE_ETC_DEFAULT_LOGIN
1061 read_etc_default_login(&env, &envsize, pw->pw_uid);
1062 path = child_get_env(env, "PATH");
1063# endif /* HAVE_ETC_DEFAULT_LOGIN */
1064 if (path == NULL || *path == '\0') {
Damien Millera8e06ce2003-11-21 23:48:55 +11001065 child_set_env(&env, &envsize, "PATH",
Darren Tuckere1a790d2003-09-16 11:52:19 +10001066 s->pw->pw_uid == 0 ?
1067 SUPERUSER_PATH : _PATH_STDPATH);
1068 }
Damien Millercb5e44a2000-09-29 12:12:36 +11001069# endif /* HAVE_CYGWIN */
1070#endif /* HAVE_LOGIN_CAP */
Damien Millerb38eff82000-04-01 11:09:21 +10001071
1072 snprintf(buf, sizeof buf, "%.200s/%.50s",
1073 _PATH_MAILDIR, pw->pw_name);
1074 child_set_env(&env, &envsize, "MAIL", buf);
1075
1076 /* Normal systems set SHELL by default. */
1077 child_set_env(&env, &envsize, "SHELL", shell);
1078 }
1079 if (getenv("TZ"))
1080 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1081
1082 /* Set custom environment options from RSA authentication. */
Ben Lindstrom38b951c2001-12-06 17:47:47 +00001083 if (!options.use_login) {
1084 while (custom_environment) {
1085 struct envstring *ce = custom_environment;
Ben Lindstrom5a9d0ea2002-07-04 00:12:53 +00001086 char *str = ce->s;
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001087
Ben Lindstrom5a9d0ea2002-07-04 00:12:53 +00001088 for (i = 0; str[i] != '=' && str[i]; i++)
Ben Lindstrom38b951c2001-12-06 17:47:47 +00001089 ;
Ben Lindstrom5a9d0ea2002-07-04 00:12:53 +00001090 if (str[i] == '=') {
1091 str[i] = 0;
1092 child_set_env(&env, &envsize, str, str + i + 1);
Ben Lindstrom38b951c2001-12-06 17:47:47 +00001093 }
1094 custom_environment = ce->next;
1095 xfree(ce->s);
1096 xfree(ce);
Damien Millerb38eff82000-04-01 11:09:21 +10001097 }
Damien Millerb38eff82000-04-01 11:09:21 +10001098 }
1099
Damien Millerf37e2462002-09-19 11:47:55 +10001100 /* SSH_CLIENT deprecated */
Damien Millerb38eff82000-04-01 11:09:21 +10001101 snprintf(buf, sizeof buf, "%.50s %d %d",
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001102 get_remote_ipaddr(), get_remote_port(), get_local_port());
Damien Millerb38eff82000-04-01 11:09:21 +10001103 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1104
Damien Miller00111382003-03-10 11:21:17 +11001105 laddr = get_local_ipaddr(packet_get_connection_in());
Damien Millerf37e2462002-09-19 11:47:55 +10001106 snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
Damien Miller00111382003-03-10 11:21:17 +11001107 get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
1108 xfree(laddr);
Damien Millerf37e2462002-09-19 11:47:55 +10001109 child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1110
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001111 if (s->ttyfd != -1)
1112 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1113 if (s->term)
1114 child_set_env(&env, &envsize, "TERM", s->term);
1115 if (s->display)
1116 child_set_env(&env, &envsize, "DISPLAY", s->display);
Damien Miller7b28dc52000-09-05 13:34:53 +11001117 if (original_command)
1118 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1119 original_command);
Damien Millerb38eff82000-04-01 11:09:21 +10001120
Tim Rice81ed5182002-09-25 17:38:46 -07001121#ifdef _UNICOS
1122 if (cray_tmpdir[0] != '\0')
1123 child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir);
1124#endif /* _UNICOS */
1125
Darren Tucker9dc6c7d2005-02-02 18:30:33 +11001126 /*
1127 * Since we clear KRB5CCNAME at startup, if it's set now then it
1128 * must have been set by a native authentication method (eg AIX or
1129 * SIA), so copy it to the child.
1130 */
1131 {
1132 char *cp;
1133
1134 if ((cp = getenv("KRB5CCNAME")) != NULL)
1135 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1136 }
1137
Damien Millerb38eff82000-04-01 11:09:21 +10001138#ifdef _AIX
Ben Lindstrom839ac4f2002-02-24 20:42:46 +00001139 {
1140 char *cp;
1141
1142 if ((cp = getenv("AUTHSTATE")) != NULL)
1143 child_set_env(&env, &envsize, "AUTHSTATE", cp);
Ben Lindstrom839ac4f2002-02-24 20:42:46 +00001144 read_environment_file(&env, &envsize, "/etc/environment");
1145 }
Damien Millerb38eff82000-04-01 11:09:21 +10001146#endif
Ben Lindstromec95ed92001-07-04 04:21:14 +00001147#ifdef KRB5
Damien Miller9c870f92004-04-16 22:47:55 +10001148 if (s->authctxt->krb5_ccname)
Ben Lindstromec95ed92001-07-04 04:21:14 +00001149 child_set_env(&env, &envsize, "KRB5CCNAME",
Damien Miller9c870f92004-04-16 22:47:55 +10001150 s->authctxt->krb5_ccname);
Ben Lindstromec95ed92001-07-04 04:21:14 +00001151#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001152#ifdef USE_PAM
Kevin Steves38b050a2002-07-23 00:44:07 +00001153 /*
1154 * Pull in any environment variables that may have
1155 * been set by PAM.
1156 */
Damien Miller4e448a32003-05-14 15:11:48 +10001157 if (options.use_pam) {
Damien Millerc756e9b2003-11-17 21:41:42 +11001158 char **p;
Damien Miller787b2ec2003-11-21 23:56:47 +11001159
Damien Millerc756e9b2003-11-17 21:41:42 +11001160 p = fetch_pam_child_environment();
1161 copy_environment(p, &env, &envsize);
1162 free_pam_environment(p);
Kevin Steves38b050a2002-07-23 00:44:07 +00001163
Damien Millerc756e9b2003-11-17 21:41:42 +11001164 p = fetch_pam_environment();
Kevin Steves38b050a2002-07-23 00:44:07 +00001165 copy_environment(p, &env, &envsize);
1166 free_pam_environment(p);
1167 }
Damien Millerb38eff82000-04-01 11:09:21 +10001168#endif /* USE_PAM */
1169
Ben Lindstrom8bb6f362002-06-11 15:59:02 +00001170 if (auth_sock_name != NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001171 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
Ben Lindstrom8bb6f362002-06-11 15:59:02 +00001172 auth_sock_name);
Damien Millerb38eff82000-04-01 11:09:21 +10001173
1174 /* read $HOME/.ssh/environment. */
Ben Lindstrom5d860f02002-08-01 01:28:38 +00001175 if (options.permit_user_env && !options.use_login) {
Damien Millerb1715dc2000-05-30 13:44:51 +10001176 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
Damien Millere9994cb2002-09-10 21:43:53 +10001177 strcmp(pw->pw_dir, "/") ? pw->pw_dir : "");
Damien Millerb38eff82000-04-01 11:09:21 +10001178 read_environment_file(&env, &envsize, buf);
1179 }
1180 if (debug_flag) {
1181 /* dump the environment */
1182 fprintf(stderr, "Environment:\n");
1183 for (i = 0; env[i]; i++)
1184 fprintf(stderr, " %.200s\n", env[i]);
1185 }
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001186 return env;
1187}
1188
1189/*
1190 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1191 * first in this order).
1192 */
1193static void
1194do_rc_files(Session *s, const char *shell)
1195{
1196 FILE *f = NULL;
1197 char cmd[1024];
1198 int do_xauth;
1199 struct stat st;
1200
1201 do_xauth =
1202 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1203
1204 /* ignore _PATH_SSH_USER_RC for subsystems */
1205 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1206 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1207 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1208 if (debug_flag)
1209 fprintf(stderr, "Running %s\n", cmd);
1210 f = popen(cmd, "w");
1211 if (f) {
1212 if (do_xauth)
1213 fprintf(f, "%s %s\n", s->auth_proto,
1214 s->auth_data);
1215 pclose(f);
1216 } else
1217 fprintf(stderr, "Could not run %s\n",
1218 _PATH_SSH_USER_RC);
1219 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1220 if (debug_flag)
1221 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1222 _PATH_SSH_SYSTEM_RC);
1223 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1224 if (f) {
1225 if (do_xauth)
1226 fprintf(f, "%s %s\n", s->auth_proto,
1227 s->auth_data);
1228 pclose(f);
1229 } else
1230 fprintf(stderr, "Could not run %s\n",
1231 _PATH_SSH_SYSTEM_RC);
1232 } else if (do_xauth && options.xauth_location != NULL) {
1233 /* Add authority data to .Xauthority if appropriate. */
1234 if (debug_flag) {
1235 fprintf(stderr,
Ben Lindstrom611797e2002-12-23 02:15:57 +00001236 "Running %.500s remove %.100s\n",
Darren Tucker3e33cec2003-10-02 16:12:36 +10001237 options.xauth_location, s->auth_display);
Ben Lindstrom611797e2002-12-23 02:15:57 +00001238 fprintf(stderr,
1239 "%.500s add %.100s %.100s %.100s\n",
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001240 options.xauth_location, s->auth_display,
1241 s->auth_proto, s->auth_data);
1242 }
1243 snprintf(cmd, sizeof cmd, "%s -q -",
1244 options.xauth_location);
1245 f = popen(cmd, "w");
1246 if (f) {
Ben Lindstrom611797e2002-12-23 02:15:57 +00001247 fprintf(f, "remove %s\n",
1248 s->auth_display);
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001249 fprintf(f, "add %s %s %s\n",
1250 s->auth_display, s->auth_proto,
1251 s->auth_data);
1252 pclose(f);
1253 } else {
1254 fprintf(stderr, "Could not run %s\n",
1255 cmd);
1256 }
1257 }
1258}
1259
1260static void
1261do_nologin(struct passwd *pw)
1262{
1263 FILE *f = NULL;
1264 char buf[1024];
1265
1266#ifdef HAVE_LOGIN_CAP
1267 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1268 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1269 _PATH_NOLOGIN), "r");
1270#else
1271 if (pw->pw_uid)
1272 f = fopen(_PATH_NOLOGIN, "r");
1273#endif
1274 if (f) {
1275 /* /etc/nologin exists. Print its contents and exit. */
Damien Miller996acd22003-04-09 20:59:48 +10001276 logit("User %.100s not allowed because %s exists",
Damien Millera6eb2b72002-09-19 11:50:48 +10001277 pw->pw_name, _PATH_NOLOGIN);
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001278 while (fgets(buf, sizeof(buf), f))
1279 fputs(buf, stderr);
1280 fclose(f);
Damien Millerf25c18d2003-01-07 17:38:58 +11001281 fflush(NULL);
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001282 exit(254);
1283 }
1284}
1285
1286/* Set login name, uid, gid, and groups. */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001287void
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001288do_setusercontext(struct passwd *pw)
1289{
Damien Miller1a3ccb02003-02-24 13:04:01 +11001290#ifndef HAVE_CYGWIN
1291 if (getuid() == 0 || geteuid() == 0)
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001292#endif /* HAVE_CYGWIN */
Damien Miller1a3ccb02003-02-24 13:04:01 +11001293 {
1294
Ben Lindstromf0bfa832002-06-21 00:01:18 +00001295#ifdef HAVE_SETPCRED
Darren Tucker793e8172003-07-08 21:01:04 +10001296 if (setpcred(pw->pw_name, (char **)NULL) == -1)
1297 fatal("Failed to set process credentials");
Ben Lindstromf0bfa832002-06-21 00:01:18 +00001298#endif /* HAVE_SETPCRED */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001299#ifdef HAVE_LOGIN_CAP
Ben Lindstrom938b8282002-07-15 17:58:34 +00001300# ifdef __bsdi__
Damien Millerf18cd162002-06-26 19:12:59 +10001301 setpgid(0, 0);
Ben Lindstrom938b8282002-07-15 17:58:34 +00001302# endif
Darren Tuckerc97b01a2005-02-16 16:47:37 +11001303#ifdef GSSAPI
1304 if (options.gss_authentication) {
1305 temporarily_use_uid(pw);
1306 ssh_gssapi_storecreds();
1307 restore_uid();
1308 }
1309#endif
Damien Millerd3526362004-01-23 14:16:26 +11001310# ifdef USE_PAM
1311 if (options.use_pam) {
1312 do_pam_session();
1313 do_pam_setcred(0);
1314 }
1315# endif /* USE_PAM */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001316 if (setusercontext(lc, pw, pw->pw_uid,
1317 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1318 perror("unable to set user context");
1319 exit(1);
1320 }
1321#else
1322# if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1323 /* Sets login uid for accounting */
1324 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1325 error("setluid: %s", strerror(errno));
1326# endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1327
1328 if (setlogin(pw->pw_name) < 0)
1329 error("setlogin failed: %s", strerror(errno));
1330 if (setgid(pw->pw_gid) < 0) {
1331 perror("setgid");
1332 exit(1);
1333 }
1334 /* Initialize the group list. */
1335 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1336 perror("initgroups");
1337 exit(1);
1338 }
1339 endgrent();
Darren Tuckerc97b01a2005-02-16 16:47:37 +11001340#ifdef GSSAPI
1341 if (options.gss_authentication) {
1342 temporarily_use_uid(pw);
1343 ssh_gssapi_storecreds();
1344 restore_uid();
1345 }
1346#endif
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001347# ifdef USE_PAM
1348 /*
Damien Millera8e06ce2003-11-21 23:48:55 +11001349 * PAM credentials may take the form of supplementary groups.
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001350 * These will have been wiped by the above initgroups() call.
1351 * Reestablish them here.
1352 */
Damien Miller341c6e62003-09-02 23:18:52 +10001353 if (options.use_pam) {
1354 do_pam_session();
Damien Miller4e448a32003-05-14 15:11:48 +10001355 do_pam_setcred(0);
Damien Miller341c6e62003-09-02 23:18:52 +10001356 }
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001357# endif /* USE_PAM */
1358# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1359 irix_setusercontext(pw);
1360# endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
Ben Lindstromb129be62002-06-25 17:12:26 +00001361# ifdef _AIX
Ben Lindstrom51b24882002-07-04 03:08:40 +00001362 aix_usrinfo(pw);
Ben Lindstromb129be62002-06-25 17:12:26 +00001363# endif /* _AIX */
Tim Rice66fd2172005-08-31 09:59:49 -07001364#if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF)
Tim Rice2291c002005-08-26 13:15:19 -07001365 if (set_id(pw->pw_name) != 0) {
1366 exit(1);
1367 }
Tim Rice66fd2172005-08-31 09:59:49 -07001368#endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001369 /* Permanently switch to the desired uid. */
1370 permanently_set_uid(pw);
1371#endif
1372 }
Damien Miller1a3ccb02003-02-24 13:04:01 +11001373
1374#ifdef HAVE_CYGWIN
1375 if (is_winnt)
1376#endif
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001377 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1378 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
Damien Miller73b42d22006-04-22 21:26:08 +10001379
1380#ifdef WITH_SELINUX
1381 ssh_selinux_setup_exec_context(pw->pw_name);
1382#endif
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001383}
1384
Ben Lindstrom08105192002-03-22 02:50:06 +00001385static void
Darren Tucker23bc8d02004-02-06 16:24:31 +11001386do_pwchange(Session *s)
1387{
Darren Tucker09991742004-07-17 17:05:14 +10001388 fflush(NULL);
Darren Tucker23bc8d02004-02-06 16:24:31 +11001389 fprintf(stderr, "WARNING: Your password has expired.\n");
1390 if (s->ttyfd != -1) {
Darren Tuckerfc959702004-07-17 16:12:08 +10001391 fprintf(stderr,
Darren Tucker23bc8d02004-02-06 16:24:31 +11001392 "You must change your password now and login again!\n");
Darren Tucker33370e02005-02-09 22:17:28 +11001393#ifdef PASSWD_NEEDS_USERNAME
1394 execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name,
1395 (char *)NULL);
1396#else
Darren Tucker23bc8d02004-02-06 16:24:31 +11001397 execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
Darren Tucker33370e02005-02-09 22:17:28 +11001398#endif
Darren Tucker23bc8d02004-02-06 16:24:31 +11001399 perror("passwd");
1400 } else {
1401 fprintf(stderr,
1402 "Password change required but no TTY available.\n");
1403 }
1404 exit(1);
1405}
1406
1407static void
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001408launch_login(struct passwd *pw, const char *hostname)
1409{
1410 /* Launch login(1). */
1411
Ben Lindstrom378a4172002-06-07 14:49:56 +00001412 execl(LOGIN_PROGRAM, "login", "-h", hostname,
Kevin Stevesb4799a32002-03-24 23:19:54 +00001413#ifdef xxxLOGIN_NEEDS_TERM
Ben Lindstrom5a6abda2002-06-09 19:41:48 +00001414 (s->term ? s->term : "unknown"),
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001415#endif /* LOGIN_NEEDS_TERM */
Kevin Steves5feaaef2002-04-23 20:45:55 +00001416#ifdef LOGIN_NO_ENDOPT
1417 "-p", "-f", pw->pw_name, (char *)NULL);
1418#else
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001419 "-p", "-f", "--", pw->pw_name, (char *)NULL);
Kevin Steves5feaaef2002-04-23 20:45:55 +00001420#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001421
1422 /* Login couldn't be executed, die. */
1423
1424 perror("login");
1425 exit(1);
1426}
1427
Darren Tucker23bc8d02004-02-06 16:24:31 +11001428static void
1429child_close_fds(void)
1430{
1431 int i;
1432
1433 if (packet_get_connection_in() == packet_get_connection_out())
1434 close(packet_get_connection_in());
1435 else {
1436 close(packet_get_connection_in());
1437 close(packet_get_connection_out());
1438 }
1439 /*
1440 * Close all descriptors related to channels. They will still remain
1441 * open in the parent.
1442 */
1443 /* XXX better use close-on-exec? -markus */
1444 channel_close_all();
1445
1446 /*
1447 * Close any extra file descriptors. Note that there may still be
1448 * descriptors left by system functions. They will be closed later.
1449 */
1450 endpwent();
1451
1452 /*
Damien Miller788f2122005-11-05 15:14:59 +11001453 * Close any extra open file descriptors so that we don't have them
Darren Tucker23bc8d02004-02-06 16:24:31 +11001454 * hanging around in clients. Note that we want to do this after
1455 * initgroups, because at least on Solaris 2.3 it leaves file
1456 * descriptors open.
1457 */
1458 for (i = 3; i < 64; i++)
1459 close(i);
1460}
1461
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001462/*
1463 * Performs common processing for the child, such as setting up the
1464 * environment, closing extra file descriptors, setting the user and group
1465 * ids, and executing the command or shell.
1466 */
1467void
1468do_child(Session *s, const char *command)
1469{
1470 extern char **environ;
1471 char **env;
1472 char *argv[10];
1473 const char *shell, *shell0, *hostname = NULL;
1474 struct passwd *pw = s->pw;
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001475
1476 /* remove hostkey from the child's memory */
1477 destroy_sensitive_data();
1478
Darren Tucker23bc8d02004-02-06 16:24:31 +11001479 /* Force a password change */
1480 if (s->authctxt->force_pwchange) {
1481 do_setusercontext(pw);
1482 child_close_fds();
1483 do_pwchange(s);
1484 exit(1);
1485 }
1486
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001487 /* login(1) is only called if we execute the login shell */
1488 if (options.use_login && command != NULL)
1489 options.use_login = 0;
1490
Tim Rice81ed5182002-09-25 17:38:46 -07001491#ifdef _UNICOS
1492 cray_setup(pw->pw_uid, pw->pw_name, command);
1493#endif /* _UNICOS */
1494
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001495 /*
1496 * Login(1) does this as well, and it needs uid 0 for the "-h"
1497 * switch, so we let login(1) to this for us.
1498 */
1499 if (!options.use_login) {
1500#ifdef HAVE_OSF_SIA
Ben Lindstromc8c548d2003-03-21 01:18:09 +00001501 session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty);
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001502 if (!check_quietlogin(s, command))
1503 do_motd();
1504#else /* HAVE_OSF_SIA */
Darren Tucker42308a42005-10-30 15:31:55 +11001505 /* When PAM is enabled we rely on it to do the nologin check */
1506 if (!options.use_pam)
1507 do_nologin(pw);
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001508 do_setusercontext(pw);
Darren Tucker0a44d1e2004-07-01 09:48:29 +10001509 /*
1510 * PAM session modules in do_setusercontext may have
1511 * generated messages, so if this in an interactive
1512 * login then display them too.
1513 */
Darren Tuckera2a3ed02004-09-11 23:09:53 +10001514 if (!check_quietlogin(s, command))
Darren Tucker0a44d1e2004-07-01 09:48:29 +10001515 display_loginmsg();
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001516#endif /* HAVE_OSF_SIA */
1517 }
1518
Darren Tucker69687f42004-09-11 22:17:26 +10001519#ifdef USE_PAM
Darren Tucker48554152005-04-21 19:50:55 +10001520 if (options.use_pam && !options.use_login && !is_pam_session_open()) {
1521 debug3("PAM session not opened, exiting");
Darren Tucker69687f42004-09-11 22:17:26 +10001522 display_loginmsg();
1523 exit(254);
1524 }
1525#endif
1526
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001527 /*
1528 * Get the shell from the password data. An empty shell field is
1529 * legal, and means /bin/sh.
1530 */
1531 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
Ben Lindstrom46767602002-12-23 02:26:08 +00001532
1533 /*
1534 * Make sure $SHELL points to the shell from the password file,
1535 * even if shell is overridden from login.conf
1536 */
1537 env = do_setup_env(s, shell);
1538
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001539#ifdef HAVE_LOGIN_CAP
1540 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1541#endif
1542
Damien Millerad833b32000-08-23 10:46:23 +10001543 /* we have to stash the hostname before we close our socket. */
1544 if (options.use_login)
Ben Lindstromf15a3862001-04-05 23:32:17 +00001545 hostname = get_remote_name_or_ip(utmp_len,
Damien Miller3a961dc2003-06-03 10:25:48 +10001546 options.use_dns);
Damien Millerb38eff82000-04-01 11:09:21 +10001547 /*
1548 * Close the connection descriptors; note that this is the child, and
1549 * the server will still have the socket open, and it is important
1550 * that we do not shutdown it. Note that the descriptors cannot be
1551 * closed before building the environment, as we call
1552 * get_remote_ipaddr there.
1553 */
Darren Tucker23bc8d02004-02-06 16:24:31 +11001554 child_close_fds();
Damien Millerb38eff82000-04-01 11:09:21 +10001555
Damien Millerb38eff82000-04-01 11:09:21 +10001556 /*
Damien Miller05eda432002-02-10 18:32:28 +11001557 * Must take new environment into use so that .ssh/rc,
1558 * /etc/ssh/sshrc and xauth are run in the proper environment.
Damien Millerb38eff82000-04-01 11:09:21 +10001559 */
1560 environ = env;
1561
Darren Tucker3c78c5e2004-01-23 22:03:10 +11001562#if defined(KRB5) && defined(USE_AFS)
Darren Tucker22ef5082003-12-31 11:37:34 +11001563 /*
1564 * At this point, we check to see if AFS is active and if we have
1565 * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1566 * if we can (and need to) extend the ticket into an AFS token. If
1567 * we don't do this, we run into potential problems if the user's
1568 * home directory is in AFS and it's not world-readable.
1569 */
1570
1571 if (options.kerberos_get_afs_token && k_hasafs() &&
Damien Miller0dc1bef2005-07-17 17:22:45 +10001572 (s->authctxt->krb5_ctx != NULL)) {
Darren Tucker22ef5082003-12-31 11:37:34 +11001573 char cell[64];
1574
1575 debug("Getting AFS token");
1576
1577 k_setpag();
1578
1579 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1580 krb5_afslog(s->authctxt->krb5_ctx,
1581 s->authctxt->krb5_fwd_ccache, cell, NULL);
1582
1583 krb5_afslog_home(s->authctxt->krb5_ctx,
1584 s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1585 }
1586#endif
1587
Damien Miller788f2122005-11-05 15:14:59 +11001588 /* Change current directory to the user's home directory. */
Damien Miller139d4cd2001-10-10 15:07:44 +10001589 if (chdir(pw->pw_dir) < 0) {
1590 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1591 pw->pw_dir, strerror(errno));
1592#ifdef HAVE_LOGIN_CAP
1593 if (login_getcapbool(lc, "requirehome", 0))
1594 exit(1);
1595#endif
1596 }
1597
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001598 if (!options.use_login)
1599 do_rc_files(s, shell);
Ben Lindstromde71cda2001-03-24 00:43:26 +00001600
1601 /* restore SIGPIPE for child */
Damien Miller9ab00b42006-08-05 12:40:11 +10001602 signal(SIGPIPE, SIG_DFL);
Ben Lindstromde71cda2001-03-24 00:43:26 +00001603
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001604 if (options.use_login) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001605 launch_login(pw, hostname);
1606 /* NEVERREACHED */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001607 }
1608
1609 /* Get the last component of the shell name. */
1610 if ((shell0 = strrchr(shell, '/')) != NULL)
1611 shell0++;
1612 else
1613 shell0 = shell;
1614
Damien Millerb38eff82000-04-01 11:09:21 +10001615 /*
1616 * If we have no command, execute the shell. In this case, the shell
1617 * name to be passed in argv[0] is preceded by '-' to indicate that
1618 * this is a login shell.
1619 */
1620 if (!command) {
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001621 char argv0[256];
Damien Millerb38eff82000-04-01 11:09:21 +10001622
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001623 /* Start the shell. Set initial character to '-'. */
1624 argv0[0] = '-';
Damien Millerb38eff82000-04-01 11:09:21 +10001625
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001626 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1627 >= sizeof(argv0) - 1) {
1628 errno = EINVAL;
Damien Millerb38eff82000-04-01 11:09:21 +10001629 perror(shell);
1630 exit(1);
Damien Millerb38eff82000-04-01 11:09:21 +10001631 }
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001632
1633 /* Execute the shell. */
1634 argv[0] = argv0;
1635 argv[1] = NULL;
1636 execve(shell, argv, env);
1637
1638 /* Executing the shell failed. */
1639 perror(shell);
1640 exit(1);
Damien Millerb38eff82000-04-01 11:09:21 +10001641 }
1642 /*
1643 * Execute the command using the user's shell. This uses the -c
1644 * option to execute the command.
1645 */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001646 argv[0] = (char *) shell0;
Damien Millerb38eff82000-04-01 11:09:21 +10001647 argv[1] = "-c";
1648 argv[2] = (char *) command;
1649 argv[3] = NULL;
1650 execve(shell, argv, env);
1651 perror(shell);
1652 exit(1);
1653}
1654
1655Session *
1656session_new(void)
1657{
1658 int i;
1659 static int did_init = 0;
1660 if (!did_init) {
1661 debug("session_new: init");
Damien Miller9f0f5c62001-12-21 14:45:46 +11001662 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001663 sessions[i].used = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001664 }
1665 did_init = 1;
1666 }
Damien Miller9f0f5c62001-12-21 14:45:46 +11001667 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001668 Session *s = &sessions[i];
1669 if (! s->used) {
Ben Lindstrom60294322001-03-26 05:38:25 +00001670 memset(s, 0, sizeof(*s));
Damien Millerb38eff82000-04-01 11:09:21 +10001671 s->chanid = -1;
1672 s->ptyfd = -1;
1673 s->ttyfd = -1;
Damien Millerb38eff82000-04-01 11:09:21 +10001674 s->used = 1;
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001675 s->self = i;
Damien Miller2b9b0452005-07-17 17:19:24 +10001676 s->x11_chanids = NULL;
Damien Miller15b29522000-10-14 12:33:48 +11001677 debug("session_new: session %d", i);
Damien Millerb38eff82000-04-01 11:09:21 +10001678 return s;
1679 }
1680 }
1681 return NULL;
1682}
1683
Ben Lindstrombba81212001-06-25 05:01:22 +00001684static void
Damien Millerb38eff82000-04-01 11:09:21 +10001685session_dump(void)
1686{
1687 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001688 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001689 Session *s = &sessions[i];
Ben Lindstromce0f6342002-06-11 16:42:49 +00001690 debug("dump: used %d session %d %p channel %d pid %ld",
Damien Millerb38eff82000-04-01 11:09:21 +10001691 s->used,
1692 s->self,
1693 s,
1694 s->chanid,
Ben Lindstromce0f6342002-06-11 16:42:49 +00001695 (long)s->pid);
Damien Millerb38eff82000-04-01 11:09:21 +10001696 }
1697}
1698
Damien Millerefb4afe2000-04-12 18:45:05 +10001699int
Ben Lindstrombddd5512001-07-04 04:53:53 +00001700session_open(Authctxt *authctxt, int chanid)
Damien Millerefb4afe2000-04-12 18:45:05 +10001701{
1702 Session *s = session_new();
1703 debug("session_open: channel %d", chanid);
1704 if (s == NULL) {
1705 error("no more sessions");
1706 return 0;
1707 }
Ben Lindstrombddd5512001-07-04 04:53:53 +00001708 s->authctxt = authctxt;
1709 s->pw = authctxt->pw;
Damien Miller3e3b5142003-11-17 21:13:40 +11001710 if (s->pw == NULL || !authctxt->valid)
Kevin Steves43cdef32001-02-11 14:12:08 +00001711 fatal("no user for session %d", s->self);
Damien Millerbd483e72000-04-30 10:00:53 +10001712 debug("session_open: session %d: link with channel %d", s->self, chanid);
1713 s->chanid = chanid;
Damien Millerefb4afe2000-04-12 18:45:05 +10001714 return 1;
1715}
1716
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001717Session *
1718session_by_tty(char *tty)
1719{
1720 int i;
1721 for (i = 0; i < MAX_SESSIONS; i++) {
1722 Session *s = &sessions[i];
1723 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1724 debug("session_by_tty: session %d tty %s", i, tty);
1725 return s;
1726 }
1727 }
1728 debug("session_by_tty: unknown tty %.100s", tty);
1729 session_dump();
1730 return NULL;
1731}
1732
Ben Lindstrombba81212001-06-25 05:01:22 +00001733static Session *
Damien Millerefb4afe2000-04-12 18:45:05 +10001734session_by_channel(int id)
1735{
1736 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001737 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerefb4afe2000-04-12 18:45:05 +10001738 Session *s = &sessions[i];
1739 if (s->used && s->chanid == id) {
1740 debug("session_by_channel: session %d channel %d", i, id);
1741 return s;
1742 }
1743 }
1744 debug("session_by_channel: unknown channel %d", id);
1745 session_dump();
1746 return NULL;
1747}
1748
Ben Lindstrombba81212001-06-25 05:01:22 +00001749static Session *
Damien Miller2b9b0452005-07-17 17:19:24 +10001750session_by_x11_channel(int id)
1751{
1752 int i, j;
1753
1754 for (i = 0; i < MAX_SESSIONS; i++) {
1755 Session *s = &sessions[i];
1756
1757 if (s->x11_chanids == NULL || !s->used)
1758 continue;
1759 for (j = 0; s->x11_chanids[j] != -1; j++) {
1760 if (s->x11_chanids[j] == id) {
1761 debug("session_by_x11_channel: session %d "
1762 "channel %d", s->self, id);
1763 return s;
1764 }
1765 }
1766 }
1767 debug("session_by_x11_channel: unknown channel %d", id);
1768 session_dump();
1769 return NULL;
1770}
1771
1772static Session *
Damien Millerefb4afe2000-04-12 18:45:05 +10001773session_by_pid(pid_t pid)
1774{
1775 int i;
Ben Lindstromce0f6342002-06-11 16:42:49 +00001776 debug("session_by_pid: pid %ld", (long)pid);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001777 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerefb4afe2000-04-12 18:45:05 +10001778 Session *s = &sessions[i];
1779 if (s->used && s->pid == pid)
1780 return s;
1781 }
Ben Lindstromce0f6342002-06-11 16:42:49 +00001782 error("session_by_pid: unknown pid %ld", (long)pid);
Damien Millerefb4afe2000-04-12 18:45:05 +10001783 session_dump();
1784 return NULL;
1785}
1786
Ben Lindstrombba81212001-06-25 05:01:22 +00001787static int
Damien Millerefb4afe2000-04-12 18:45:05 +10001788session_window_change_req(Session *s)
1789{
1790 s->col = packet_get_int();
1791 s->row = packet_get_int();
1792 s->xpixel = packet_get_int();
1793 s->ypixel = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001794 packet_check_eom();
Damien Millerefb4afe2000-04-12 18:45:05 +10001795 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1796 return 1;
1797}
1798
Ben Lindstrombba81212001-06-25 05:01:22 +00001799static int
Damien Millerefb4afe2000-04-12 18:45:05 +10001800session_pty_req(Session *s)
1801{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001802 u_int len;
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001803 int n_bytes;
Ben Lindstrom6328ab32002-03-22 02:54:23 +00001804
Ben Lindstrom49c12602001-06-13 04:37:36 +00001805 if (no_pty_flag) {
1806 debug("Allocating a pty not permitted for this authentication.");
Damien Millerf6d9e222000-06-18 14:50:44 +10001807 return 0;
Ben Lindstrom49c12602001-06-13 04:37:36 +00001808 }
1809 if (s->ttyfd != -1) {
1810 packet_disconnect("Protocol error: you already have a pty.");
Damien Miller4af51302000-04-16 11:18:38 +10001811 return 0;
Ben Lindstrom49c12602001-06-13 04:37:36 +00001812 }
1813
Damien Millerefb4afe2000-04-12 18:45:05 +10001814 s->term = packet_get_string(&len);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001815
1816 if (compat20) {
1817 s->col = packet_get_int();
1818 s->row = packet_get_int();
1819 } else {
1820 s->row = packet_get_int();
1821 s->col = packet_get_int();
1822 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001823 s->xpixel = packet_get_int();
1824 s->ypixel = packet_get_int();
1825
1826 if (strcmp(s->term, "") == 0) {
1827 xfree(s->term);
1828 s->term = NULL;
1829 }
Ben Lindstrom49c12602001-06-13 04:37:36 +00001830
Damien Millerefb4afe2000-04-12 18:45:05 +10001831 /* Allocate a pty and open it. */
Ben Lindstrom49c12602001-06-13 04:37:36 +00001832 debug("Allocating pty.");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001833 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
Ben Lindstrom49c12602001-06-13 04:37:36 +00001834 if (s->term)
1835 xfree(s->term);
Damien Millerefb4afe2000-04-12 18:45:05 +10001836 s->term = NULL;
1837 s->ptyfd = -1;
1838 s->ttyfd = -1;
1839 error("session_pty_req: session %d alloc failed", s->self);
Damien Miller4af51302000-04-16 11:18:38 +10001840 return 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001841 }
1842 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001843
1844 /* for SSH1 the tty modes length is not given */
1845 if (!compat20)
1846 n_bytes = packet_remaining();
1847 tty_parse_modes(s->ttyfd, &n_bytes);
1848
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001849 if (!use_privsep)
1850 pty_setowner(s->pw, s->tty);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001851
1852 /* Set window size from the packet. */
Damien Millerefb4afe2000-04-12 18:45:05 +10001853 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1854
Damien Miller48b03fc2002-01-22 23:11:40 +11001855 packet_check_eom();
Damien Millere247cc42000-05-07 12:03:14 +10001856 session_proctitle(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001857 return 1;
1858}
1859
Ben Lindstrombba81212001-06-25 05:01:22 +00001860static int
Damien Millerbd483e72000-04-30 10:00:53 +10001861session_subsystem_req(Session *s)
1862{
Damien Millerae452462001-10-10 15:08:06 +10001863 struct stat st;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001864 u_int len;
Damien Millerbd483e72000-04-30 10:00:53 +10001865 int success = 0;
Damien Miller917f9b62006-07-10 20:36:47 +10001866 char *prog, *cmd, *subsys = packet_get_string(&len);
Damien Millereccb9de2005-06-17 12:59:34 +10001867 u_int i;
Damien Millerbd483e72000-04-30 10:00:53 +10001868
Damien Miller48b03fc2002-01-22 23:11:40 +11001869 packet_check_eom();
Damien Miller996acd22003-04-09 20:59:48 +10001870 logit("subsystem request for %.100s", subsys);
Damien Millerbd483e72000-04-30 10:00:53 +10001871
Damien Millerf6d9e222000-06-18 14:50:44 +10001872 for (i = 0; i < options.num_subsystems; i++) {
Damien Millerae452462001-10-10 15:08:06 +10001873 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
Damien Miller917f9b62006-07-10 20:36:47 +10001874 prog = options.subsystem_command[i];
1875 cmd = options.subsystem_args[i];
1876 if (stat(prog, &st) < 0) {
1877 error("subsystem: cannot stat %s: %s", prog,
Damien Millerae452462001-10-10 15:08:06 +10001878 strerror(errno));
1879 break;
1880 }
1881 debug("subsystem: exec() %s", cmd);
Ben Lindstromfc9b07d2001-03-22 01:27:23 +00001882 s->is_subsystem = 1;
Damien Millerae452462001-10-10 15:08:06 +10001883 do_exec(s, cmd);
Damien Millerf6d9e222000-06-18 14:50:44 +10001884 success = 1;
Damien Miller5fab4b92002-02-05 12:15:07 +11001885 break;
Damien Millerf6d9e222000-06-18 14:50:44 +10001886 }
1887 }
1888
1889 if (!success)
Damien Miller996acd22003-04-09 20:59:48 +10001890 logit("subsystem request for %.100s failed, subsystem not found",
Damien Millerae452462001-10-10 15:08:06 +10001891 subsys);
Damien Millerf6d9e222000-06-18 14:50:44 +10001892
Damien Millerbd483e72000-04-30 10:00:53 +10001893 xfree(subsys);
1894 return success;
1895}
1896
Ben Lindstrombba81212001-06-25 05:01:22 +00001897static int
Damien Millerbd483e72000-04-30 10:00:53 +10001898session_x11_req(Session *s)
1899{
Ben Lindstrom768176b2001-06-09 01:29:12 +00001900 int success;
Damien Millerbd483e72000-04-30 10:00:53 +10001901
Damien Miller2b9b0452005-07-17 17:19:24 +10001902 if (s->auth_proto != NULL || s->auth_data != NULL) {
1903 error("session_x11_req: session %d: "
Darren Tucker63551872005-12-20 16:14:15 +11001904 "x11 forwarding already active", s->self);
Damien Miller2b9b0452005-07-17 17:19:24 +10001905 return 0;
1906 }
Damien Millerbd483e72000-04-30 10:00:53 +10001907 s->single_connection = packet_get_char();
1908 s->auth_proto = packet_get_string(NULL);
1909 s->auth_data = packet_get_string(NULL);
1910 s->screen = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001911 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10001912
Ben Lindstrom768176b2001-06-09 01:29:12 +00001913 success = session_setup_x11fwd(s);
1914 if (!success) {
Damien Millerbd483e72000-04-30 10:00:53 +10001915 xfree(s->auth_proto);
1916 xfree(s->auth_data);
Ben Lindstrom88259fb2001-06-12 00:21:34 +00001917 s->auth_proto = NULL;
1918 s->auth_data = NULL;
Damien Millerbd483e72000-04-30 10:00:53 +10001919 }
Ben Lindstrom768176b2001-06-09 01:29:12 +00001920 return success;
Damien Millerbd483e72000-04-30 10:00:53 +10001921}
1922
Ben Lindstrombba81212001-06-25 05:01:22 +00001923static int
Damien Millerf6d9e222000-06-18 14:50:44 +10001924session_shell_req(Session *s)
1925{
Damien Miller48b03fc2002-01-22 23:11:40 +11001926 packet_check_eom();
Ben Lindstromc85ab8a2001-06-21 03:13:10 +00001927 do_exec(s, NULL);
Damien Millerf6d9e222000-06-18 14:50:44 +10001928 return 1;
1929}
1930
Ben Lindstrombba81212001-06-25 05:01:22 +00001931static int
Damien Millerf6d9e222000-06-18 14:50:44 +10001932session_exec_req(Session *s)
1933{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001934 u_int len;
Damien Millerf6d9e222000-06-18 14:50:44 +10001935 char *command = packet_get_string(&len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001936 packet_check_eom();
Ben Lindstromc85ab8a2001-06-21 03:13:10 +00001937 do_exec(s, command);
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +00001938 xfree(command);
Damien Millerf6d9e222000-06-18 14:50:44 +10001939 return 1;
1940}
1941
Ben Lindstrombba81212001-06-25 05:01:22 +00001942static int
Damien Miller54c45982003-05-15 10:20:13 +10001943session_break_req(Session *s)
1944{
Damien Miller54c45982003-05-15 10:20:13 +10001945
Darren Tucker1f8311c2004-05-13 16:39:33 +10001946 packet_get_int(); /* ignored */
Damien Miller54c45982003-05-15 10:20:13 +10001947 packet_check_eom();
1948
Darren Tucker3bdbd842003-08-13 20:31:05 +10001949 if (s->ttyfd == -1 ||
1950 tcsendbreak(s->ttyfd, 0) < 0)
Damien Miller54c45982003-05-15 10:20:13 +10001951 return 0;
Damien Miller54c45982003-05-15 10:20:13 +10001952 return 1;
1953}
1954
1955static int
Darren Tucker46bc0752004-05-02 22:11:30 +10001956session_env_req(Session *s)
1957{
1958 char *name, *val;
1959 u_int name_len, val_len, i;
1960
1961 name = packet_get_string(&name_len);
1962 val = packet_get_string(&val_len);
1963 packet_check_eom();
1964
1965 /* Don't set too many environment variables */
1966 if (s->num_env > 128) {
1967 debug2("Ignoring env request %s: too many env vars", name);
1968 goto fail;
1969 }
1970
1971 for (i = 0; i < options.num_accept_env; i++) {
1972 if (match_pattern(name, options.accept_env[i])) {
1973 debug2("Setting env %d: %s=%s", s->num_env, name, val);
Damien Miller36812092006-03-26 14:22:47 +11001974 s->env = xrealloc(s->env, s->num_env + 1,
1975 sizeof(*s->env));
Darren Tucker46bc0752004-05-02 22:11:30 +10001976 s->env[s->num_env].name = name;
1977 s->env[s->num_env].val = val;
1978 s->num_env++;
1979 return (1);
1980 }
1981 }
1982 debug2("Ignoring env request %s: disallowed name", name);
1983
1984 fail:
1985 xfree(name);
1986 xfree(val);
1987 return (0);
1988}
1989
1990static int
Damien Miller0bc1bd82000-11-13 22:57:25 +11001991session_auth_agent_req(Session *s)
1992{
1993 static int called = 0;
Damien Miller48b03fc2002-01-22 23:11:40 +11001994 packet_check_eom();
Ben Lindstrom14920292000-11-21 21:24:55 +00001995 if (no_agent_forwarding_flag) {
1996 debug("session_auth_agent_req: no_agent_forwarding_flag");
1997 return 0;
1998 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001999 if (called) {
2000 return 0;
2001 } else {
2002 called = 1;
2003 return auth_input_request_forwarding(s->pw);
2004 }
2005}
2006
Damien Millerc7ef63d2002-02-05 12:21:42 +11002007int
2008session_input_channel_req(Channel *c, const char *rtype)
Damien Millerefb4afe2000-04-12 18:45:05 +10002009{
Damien Millerefb4afe2000-04-12 18:45:05 +10002010 int success = 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10002011 Session *s;
Damien Millerefb4afe2000-04-12 18:45:05 +10002012
Damien Millerc7ef63d2002-02-05 12:21:42 +11002013 if ((s = session_by_channel(c->self)) == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +10002014 logit("session_input_channel_req: no session %d req %.100s",
Damien Millerc7ef63d2002-02-05 12:21:42 +11002015 c->self, rtype);
2016 return 0;
2017 }
2018 debug("session_input_channel_req: session %d req %s", s->self, rtype);
Damien Millerefb4afe2000-04-12 18:45:05 +10002019
2020 /*
Ben Lindstromfc9b07d2001-03-22 01:27:23 +00002021 * a session is in LARVAL state until a shell, a command
2022 * or a subsystem is executed
Damien Millerefb4afe2000-04-12 18:45:05 +10002023 */
2024 if (c->type == SSH_CHANNEL_LARVAL) {
2025 if (strcmp(rtype, "shell") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10002026 success = session_shell_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10002027 } else if (strcmp(rtype, "exec") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10002028 success = session_exec_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10002029 } else if (strcmp(rtype, "pty-req") == 0) {
Damien Miller5f056372000-04-16 12:31:48 +10002030 success = session_pty_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10002031 } else if (strcmp(rtype, "x11-req") == 0) {
2032 success = session_x11_req(s);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002033 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
2034 success = session_auth_agent_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10002035 } else if (strcmp(rtype, "subsystem") == 0) {
2036 success = session_subsystem_req(s);
Darren Tucker46bc0752004-05-02 22:11:30 +10002037 } else if (strcmp(rtype, "env") == 0) {
2038 success = session_env_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10002039 }
2040 }
2041 if (strcmp(rtype, "window-change") == 0) {
2042 success = session_window_change_req(s);
Damien Millera6b1d162004-06-30 22:41:07 +10002043 } else if (strcmp(rtype, "break") == 0) {
2044 success = session_break_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10002045 }
Damien Millera6b1d162004-06-30 22:41:07 +10002046
Damien Millerc7ef63d2002-02-05 12:21:42 +11002047 return success;
Damien Millerefb4afe2000-04-12 18:45:05 +10002048}
2049
2050void
2051session_set_fds(Session *s, int fdin, int fdout, int fderr)
2052{
2053 if (!compat20)
2054 fatal("session_set_fds: called for proto != 2.0");
2055 /*
2056 * now that have a child and a pipe to the child,
2057 * we can activate our channel and register the fd's
2058 */
2059 if (s->chanid == -1)
2060 fatal("no channel for session %d", s->self);
2061 channel_set_fds(s->chanid,
2062 fdout, fdin, fderr,
Damien Miller69b69aa2000-10-28 14:19:58 +11002063 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
Damien Miller19a59452002-02-19 15:20:57 +11002064 1,
2065 CHAN_SES_WINDOW_DEFAULT);
Damien Millerefb4afe2000-04-12 18:45:05 +10002066}
2067
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00002068/*
2069 * Function to perform pty cleanup. Also called if we get aborted abnormally
2070 * (e.g., due to a dropped connection).
2071 */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002072void
Darren Tucker3e33cec2003-10-02 16:12:36 +10002073session_pty_cleanup2(Session *s)
Damien Millerb38eff82000-04-01 11:09:21 +10002074{
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00002075 if (s == NULL) {
2076 error("session_pty_cleanup: no session");
2077 return;
2078 }
2079 if (s->ttyfd == -1)
Damien Millerb38eff82000-04-01 11:09:21 +10002080 return;
2081
Kevin Steves43cdef32001-02-11 14:12:08 +00002082 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
Damien Millerb38eff82000-04-01 11:09:21 +10002083
Damien Millerb38eff82000-04-01 11:09:21 +10002084 /* Record that the user has logged out. */
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00002085 if (s->pid != 0)
Tim Ricee06ae4a2002-02-24 17:56:46 -08002086 record_logout(s->pid, s->tty, s->pw->pw_name);
Damien Millerb38eff82000-04-01 11:09:21 +10002087
2088 /* Release the pseudo-tty. */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002089 if (getuid() == 0)
2090 pty_release(s->tty);
Damien Millerb38eff82000-04-01 11:09:21 +10002091
2092 /*
2093 * Close the server side of the socket pairs. We must do this after
2094 * the pty cleanup, so that another process doesn't get this pty
2095 * while we're still cleaning up.
2096 */
2097 if (close(s->ptymaster) < 0)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002098 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
Damien Miller0585d512001-10-12 11:35:50 +10002099
2100 /* unlink pty from session */
2101 s->ttyfd = -1;
Damien Millerb38eff82000-04-01 11:09:21 +10002102}
Damien Millerefb4afe2000-04-12 18:45:05 +10002103
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002104void
Darren Tucker3e33cec2003-10-02 16:12:36 +10002105session_pty_cleanup(Session *s)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002106{
Darren Tucker3e33cec2003-10-02 16:12:36 +10002107 PRIVSEP(session_pty_cleanup2(s));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002108}
2109
Damien Miller5a80bba2002-09-04 16:39:02 +10002110static char *
2111sig2name(int sig)
2112{
2113#define SSH_SIG(x) if (sig == SIG ## x) return #x
2114 SSH_SIG(ABRT);
2115 SSH_SIG(ALRM);
2116 SSH_SIG(FPE);
2117 SSH_SIG(HUP);
2118 SSH_SIG(ILL);
2119 SSH_SIG(INT);
2120 SSH_SIG(KILL);
2121 SSH_SIG(PIPE);
2122 SSH_SIG(QUIT);
2123 SSH_SIG(SEGV);
2124 SSH_SIG(TERM);
2125 SSH_SIG(USR1);
2126 SSH_SIG(USR2);
2127#undef SSH_SIG
2128 return "SIG@openssh.com";
2129}
2130
Ben Lindstrombba81212001-06-25 05:01:22 +00002131static void
Damien Miller2b9b0452005-07-17 17:19:24 +10002132session_close_x11(int id)
2133{
2134 Channel *c;
2135
Damien Millerd47c62a2005-12-13 19:33:57 +11002136 if ((c = channel_by_id(id)) == NULL) {
Damien Miller2b9b0452005-07-17 17:19:24 +10002137 debug("session_close_x11: x11 channel %d missing", id);
2138 } else {
2139 /* Detach X11 listener */
2140 debug("session_close_x11: detach x11 channel %d", id);
2141 channel_cancel_cleanup(id);
2142 if (c->ostate != CHAN_OUTPUT_CLOSED)
2143 chan_mark_dead(c);
2144 }
2145}
2146
2147static void
2148session_close_single_x11(int id, void *arg)
2149{
2150 Session *s;
2151 u_int i;
2152
2153 debug3("session_close_single_x11: channel %d", id);
2154 channel_cancel_cleanup(id);
2155 if ((s = session_by_x11_channel(id)) == NULL)
2156 fatal("session_close_single_x11: no x11 channel %d", id);
2157 for (i = 0; s->x11_chanids[i] != -1; i++) {
2158 debug("session_close_single_x11: session %d: "
2159 "closing channel %d", s->self, s->x11_chanids[i]);
2160 /*
2161 * The channel "id" is already closing, but make sure we
2162 * close all of its siblings.
2163 */
2164 if (s->x11_chanids[i] != id)
2165 session_close_x11(s->x11_chanids[i]);
2166 }
2167 xfree(s->x11_chanids);
2168 s->x11_chanids = NULL;
2169 if (s->display) {
2170 xfree(s->display);
2171 s->display = NULL;
2172 }
2173 if (s->auth_proto) {
2174 xfree(s->auth_proto);
2175 s->auth_proto = NULL;
2176 }
2177 if (s->auth_data) {
2178 xfree(s->auth_data);
2179 s->auth_data = NULL;
2180 }
2181 if (s->auth_display) {
2182 xfree(s->auth_display);
2183 s->auth_display = NULL;
2184 }
2185}
2186
2187static void
Damien Millerefb4afe2000-04-12 18:45:05 +10002188session_exit_message(Session *s, int status)
2189{
2190 Channel *c;
Damien Millerf3dcf1f2002-02-08 22:06:48 +11002191
2192 if ((c = channel_lookup(s->chanid)) == NULL)
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00002193 fatal("session_exit_message: session %d: no channel %d",
Damien Millerefb4afe2000-04-12 18:45:05 +10002194 s->self, s->chanid);
Ben Lindstromce0f6342002-06-11 16:42:49 +00002195 debug("session_exit_message: session %d channel %d pid %ld",
2196 s->self, s->chanid, (long)s->pid);
Damien Millerefb4afe2000-04-12 18:45:05 +10002197
2198 if (WIFEXITED(status)) {
Damien Millerf3dcf1f2002-02-08 22:06:48 +11002199 channel_request_start(s->chanid, "exit-status", 0);
Damien Millerefb4afe2000-04-12 18:45:05 +10002200 packet_put_int(WEXITSTATUS(status));
2201 packet_send();
2202 } else if (WIFSIGNALED(status)) {
Damien Millerf3dcf1f2002-02-08 22:06:48 +11002203 channel_request_start(s->chanid, "exit-signal", 0);
Damien Miller5a80bba2002-09-04 16:39:02 +10002204 packet_put_cstring(sig2name(WTERMSIG(status)));
Damien Millerf3c6cf12000-05-17 22:08:29 +10002205#ifdef WCOREDUMP
Damien Millerefb4afe2000-04-12 18:45:05 +10002206 packet_put_char(WCOREDUMP(status));
Damien Millerf3c6cf12000-05-17 22:08:29 +10002207#else /* WCOREDUMP */
2208 packet_put_char(0);
2209#endif /* WCOREDUMP */
Damien Millerefb4afe2000-04-12 18:45:05 +10002210 packet_put_cstring("");
2211 packet_put_cstring("");
2212 packet_send();
2213 } else {
2214 /* Some weird exit cause. Just exit. */
2215 packet_disconnect("wait returned status %04x.", status);
2216 }
2217
2218 /* disconnect channel */
2219 debug("session_exit_message: release channel %d", s->chanid);
Damien Miller39eda6e2005-11-05 14:52:50 +11002220
2221 /*
2222 * Adjust cleanup callback attachment to send close messages when
Damien Millerc91e5562006-03-26 13:58:55 +11002223 * the channel gets EOF. The session will be then be closed
Damien Miller39eda6e2005-11-05 14:52:50 +11002224 * by session_close_by_channel when the childs close their fds.
2225 */
2226 channel_register_cleanup(c->self, session_close_by_channel, 1);
2227
Damien Miller166fca82000-04-20 07:42:21 +10002228 /*
2229 * emulate a write failure with 'chan_write_failed', nobody will be
2230 * interested in data we write.
2231 * Note that we must not call 'chan_read_failed', since there could
2232 * be some more data waiting in the pipe.
2233 */
Damien Millerbd483e72000-04-30 10:00:53 +10002234 if (c->ostate != CHAN_OUTPUT_CLOSED)
2235 chan_write_failed(c);
Damien Millerefb4afe2000-04-12 18:45:05 +10002236}
2237
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002238void
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00002239session_close(Session *s)
Damien Millerefb4afe2000-04-12 18:45:05 +10002240{
Damien Millereccb9de2005-06-17 12:59:34 +10002241 u_int i;
Darren Tucker46bc0752004-05-02 22:11:30 +10002242
Ben Lindstromce0f6342002-06-11 16:42:49 +00002243 debug("session_close: session %d pid %ld", s->self, (long)s->pid);
Darren Tucker3e33cec2003-10-02 16:12:36 +10002244 if (s->ttyfd != -1)
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00002245 session_pty_cleanup(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10002246 if (s->term)
2247 xfree(s->term);
2248 if (s->display)
2249 xfree(s->display);
Damien Miller2b9b0452005-07-17 17:19:24 +10002250 if (s->x11_chanids)
2251 xfree(s->x11_chanids);
Damien Miller512bccb2002-02-05 12:11:02 +11002252 if (s->auth_display)
2253 xfree(s->auth_display);
Damien Millerefb4afe2000-04-12 18:45:05 +10002254 if (s->auth_data)
2255 xfree(s->auth_data);
2256 if (s->auth_proto)
2257 xfree(s->auth_proto);
2258 s->used = 0;
Damien Millerd5fe0ba2006-08-30 11:07:39 +10002259 if (s->env != NULL) {
2260 for (i = 0; i < s->num_env; i++) {
2261 xfree(s->env[i].name);
2262 xfree(s->env[i].val);
2263 }
Darren Tucker46bc0752004-05-02 22:11:30 +10002264 xfree(s->env);
Damien Millerd5fe0ba2006-08-30 11:07:39 +10002265 }
Damien Millere247cc42000-05-07 12:03:14 +10002266 session_proctitle(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10002267}
2268
2269void
2270session_close_by_pid(pid_t pid, int status)
2271{
2272 Session *s = session_by_pid(pid);
2273 if (s == NULL) {
Ben Lindstromce0f6342002-06-11 16:42:49 +00002274 debug("session_close_by_pid: no session for pid %ld",
2275 (long)pid);
Damien Millerefb4afe2000-04-12 18:45:05 +10002276 return;
2277 }
2278 if (s->chanid != -1)
2279 session_exit_message(s, status);
Damien Miller39eda6e2005-11-05 14:52:50 +11002280 if (s->ttyfd != -1)
2281 session_pty_cleanup(s);
Tim Rice83d2f5f2006-02-07 15:17:44 -08002282 s->pid = 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10002283}
2284
2285/*
2286 * this is called when a channel dies before
2287 * the session 'child' itself dies
2288 */
2289void
2290session_close_by_channel(int id, void *arg)
2291{
2292 Session *s = session_by_channel(id);
Damien Miller39eda6e2005-11-05 14:52:50 +11002293 u_int i;
Damien Miller2b9b0452005-07-17 17:19:24 +10002294
Damien Millerefb4afe2000-04-12 18:45:05 +10002295 if (s == NULL) {
Damien Miller3ec27592001-10-12 11:35:04 +10002296 debug("session_close_by_channel: no session for id %d", id);
Damien Millerefb4afe2000-04-12 18:45:05 +10002297 return;
2298 }
Ben Lindstromce0f6342002-06-11 16:42:49 +00002299 debug("session_close_by_channel: channel %d child %ld",
2300 id, (long)s->pid);
Damien Miller3ec27592001-10-12 11:35:04 +10002301 if (s->pid != 0) {
Damien Miller3ec27592001-10-12 11:35:04 +10002302 debug("session_close_by_channel: channel %d: has child", id);
Damien Miller0585d512001-10-12 11:35:50 +10002303 /*
2304 * delay detach of session, but release pty, since
2305 * the fd's to the child are already closed
2306 */
Darren Tucker3e33cec2003-10-02 16:12:36 +10002307 if (s->ttyfd != -1)
Damien Miller0585d512001-10-12 11:35:50 +10002308 session_pty_cleanup(s);
Damien Miller3ec27592001-10-12 11:35:04 +10002309 return;
2310 }
2311 /* detach by removing callback */
Damien Millerefb4afe2000-04-12 18:45:05 +10002312 channel_cancel_cleanup(s->chanid);
Damien Miller39eda6e2005-11-05 14:52:50 +11002313
2314 /* Close any X11 listeners associated with this session */
2315 if (s->x11_chanids != NULL) {
2316 for (i = 0; s->x11_chanids[i] != -1; i++) {
2317 session_close_x11(s->x11_chanids[i]);
2318 s->x11_chanids[i] = -1;
2319 }
2320 }
2321
Damien Millerefb4afe2000-04-12 18:45:05 +10002322 s->chanid = -1;
Damien Miller52b77be2001-10-10 15:14:37 +10002323 session_close(s);
2324}
2325
2326void
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002327session_destroy_all(void (*closefunc)(Session *))
Damien Miller52b77be2001-10-10 15:14:37 +10002328{
2329 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11002330 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Miller52b77be2001-10-10 15:14:37 +10002331 Session *s = &sessions[i];
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002332 if (s->used) {
2333 if (closefunc != NULL)
2334 closefunc(s);
2335 else
2336 session_close(s);
2337 }
Damien Miller52b77be2001-10-10 15:14:37 +10002338 }
Damien Millerefb4afe2000-04-12 18:45:05 +10002339}
2340
Ben Lindstrombba81212001-06-25 05:01:22 +00002341static char *
Damien Millere247cc42000-05-07 12:03:14 +10002342session_tty_list(void)
2343{
2344 static char buf[1024];
2345 int i;
Damien Millera8ed44b2003-01-10 09:53:12 +11002346 char *cp;
2347
Damien Millere247cc42000-05-07 12:03:14 +10002348 buf[0] = '\0';
Damien Miller9f0f5c62001-12-21 14:45:46 +11002349 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millere247cc42000-05-07 12:03:14 +10002350 Session *s = &sessions[i];
2351 if (s->used && s->ttyfd != -1) {
Damien Miller787b2ec2003-11-21 23:56:47 +11002352
Damien Millera8ed44b2003-01-10 09:53:12 +11002353 if (strncmp(s->tty, "/dev/", 5) != 0) {
2354 cp = strrchr(s->tty, '/');
2355 cp = (cp == NULL) ? s->tty : cp + 1;
2356 } else
2357 cp = s->tty + 5;
Damien Miller787b2ec2003-11-21 23:56:47 +11002358
Damien Millere247cc42000-05-07 12:03:14 +10002359 if (buf[0] != '\0')
2360 strlcat(buf, ",", sizeof buf);
Damien Millera8ed44b2003-01-10 09:53:12 +11002361 strlcat(buf, cp, sizeof buf);
Damien Millere247cc42000-05-07 12:03:14 +10002362 }
2363 }
2364 if (buf[0] == '\0')
2365 strlcpy(buf, "notty", sizeof buf);
2366 return buf;
2367}
2368
2369void
2370session_proctitle(Session *s)
2371{
2372 if (s->pw == NULL)
2373 error("no user for session %d", s->self);
2374 else
2375 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2376}
2377
Ben Lindstrom768176b2001-06-09 01:29:12 +00002378int
2379session_setup_x11fwd(Session *s)
2380{
Ben Lindstrom768176b2001-06-09 01:29:12 +00002381 struct stat st;
Kevin Steves366298c2001-12-19 17:58:01 +00002382 char display[512], auth_display[512];
2383 char hostname[MAXHOSTNAMELEN];
Damien Miller2b9b0452005-07-17 17:19:24 +10002384 u_int i;
Ben Lindstrom768176b2001-06-09 01:29:12 +00002385
2386 if (no_x11_forwarding_flag) {
2387 packet_send_debug("X11 forwarding disabled in user configuration file.");
2388 return 0;
2389 }
2390 if (!options.x11_forwarding) {
2391 debug("X11 forwarding disabled in server configuration file.");
2392 return 0;
2393 }
2394 if (!options.xauth_location ||
2395 (stat(options.xauth_location, &st) == -1)) {
2396 packet_send_debug("No xauth program; cannot forward with spoofing.");
2397 return 0;
2398 }
Ben Lindstrom699776e2001-06-21 03:14:49 +00002399 if (options.use_login) {
2400 packet_send_debug("X11 forwarding disabled; "
2401 "not compatible with UseLogin=yes.");
2402 return 0;
2403 }
Ben Lindstrom2bcdf062001-06-13 04:41:41 +00002404 if (s->display != NULL) {
Ben Lindstrom768176b2001-06-09 01:29:12 +00002405 debug("X11 display already set.");
2406 return 0;
2407 }
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002408 if (x11_create_display_inet(options.x11_display_offset,
2409 options.x11_use_localhost, s->single_connection,
Damien Miller2b9b0452005-07-17 17:19:24 +10002410 &s->display_number, &s->x11_chanids) == -1) {
Ben Lindstrom2bcdf062001-06-13 04:41:41 +00002411 debug("x11_create_display_inet failed.");
Ben Lindstrom768176b2001-06-09 01:29:12 +00002412 return 0;
2413 }
Damien Miller2b9b0452005-07-17 17:19:24 +10002414 for (i = 0; s->x11_chanids[i] != -1; i++) {
2415 channel_register_cleanup(s->x11_chanids[i],
Damien Miller39eda6e2005-11-05 14:52:50 +11002416 session_close_single_x11, 0);
Damien Miller2b9b0452005-07-17 17:19:24 +10002417 }
Kevin Steves366298c2001-12-19 17:58:01 +00002418
2419 /* Set up a suitable value for the DISPLAY variable. */
2420 if (gethostname(hostname, sizeof(hostname)) < 0)
2421 fatal("gethostname: %.100s", strerror(errno));
2422 /*
2423 * auth_display must be used as the displayname when the
2424 * authorization entry is added with xauth(1). This will be
2425 * different than the DISPLAY string for localhost displays.
2426 */
Damien Miller95c249f2002-02-05 12:11:34 +11002427 if (options.x11_use_localhost) {
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002428 snprintf(display, sizeof display, "localhost:%u.%u",
Kevin Steves366298c2001-12-19 17:58:01 +00002429 s->display_number, s->screen);
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002430 snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
Damien Miller512bccb2002-02-05 12:11:02 +11002431 s->display_number, s->screen);
Kevin Steves366298c2001-12-19 17:58:01 +00002432 s->display = xstrdup(display);
Damien Miller512bccb2002-02-05 12:11:02 +11002433 s->auth_display = xstrdup(auth_display);
Kevin Steves366298c2001-12-19 17:58:01 +00002434 } else {
2435#ifdef IPADDR_IN_DISPLAY
2436 struct hostent *he;
2437 struct in_addr my_addr;
2438
2439 he = gethostbyname(hostname);
2440 if (he == NULL) {
2441 error("Can't get IP address for X11 DISPLAY.");
2442 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2443 return 0;
2444 }
2445 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002446 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
Kevin Steves366298c2001-12-19 17:58:01 +00002447 s->display_number, s->screen);
2448#else
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002449 snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
Kevin Steves366298c2001-12-19 17:58:01 +00002450 s->display_number, s->screen);
2451#endif
2452 s->display = xstrdup(display);
Damien Miller512bccb2002-02-05 12:11:02 +11002453 s->auth_display = xstrdup(display);
Kevin Steves366298c2001-12-19 17:58:01 +00002454 }
2455
Ben Lindstrom768176b2001-06-09 01:29:12 +00002456 return 1;
2457}
2458
Ben Lindstrombba81212001-06-25 05:01:22 +00002459static void
Ben Lindstromdb65e8f2001-01-19 04:26:52 +00002460do_authenticated2(Authctxt *authctxt)
Damien Millerefb4afe2000-04-12 18:45:05 +10002461{
Ben Lindstrombddd5512001-07-04 04:53:53 +00002462 server_loop2(authctxt);
Darren Tucker3e33cec2003-10-02 16:12:36 +10002463}
2464
2465void
2466do_cleanup(Authctxt *authctxt)
2467{
2468 static int called = 0;
2469
2470 debug("do_cleanup");
2471
2472 /* no cleanup if we're in the child for login shell */
2473 if (is_child)
2474 return;
2475
2476 /* avoid double cleanup */
2477 if (called)
2478 return;
2479 called = 1;
2480
Damien Miller3f8123c2006-08-19 00:32:46 +10002481 if (authctxt == NULL || !authctxt->authenticated)
Darren Tucker3e33cec2003-10-02 16:12:36 +10002482 return;
2483#ifdef KRB5
2484 if (options.kerberos_ticket_cleanup &&
2485 authctxt->krb5_ctx)
2486 krb5_cleanup_proc(authctxt);
Darren Tucker0efd1552003-08-26 11:49:55 +10002487#endif
Darren Tucker3e33cec2003-10-02 16:12:36 +10002488
2489#ifdef GSSAPI
2490 if (compat20 && options.gss_cleanup_creds)
2491 ssh_gssapi_cleanup_creds();
2492#endif
2493
Darren Tucker8846a072003-10-07 11:30:15 +10002494#ifdef USE_PAM
2495 if (options.use_pam) {
2496 sshpam_cleanup();
2497 sshpam_thread_cleanup();
2498 }
2499#endif
2500
Darren Tucker3e33cec2003-10-02 16:12:36 +10002501 /* remove agent socket */
2502 auth_sock_cleanup_proc(authctxt->pw);
2503
2504 /*
2505 * Cleanup ptys/utmp only if privsep is disabled,
2506 * or if running in monitor.
2507 */
2508 if (!use_privsep || mm_is_monitor())
2509 session_destroy_all(session_pty_cleanup2);
Damien Millerefb4afe2000-04-12 18:45:05 +10002510}