blob: 87e7ee6e310208a62629ae85c61f402ad625092c [file] [log] [blame]
Damien Miller525a0b02006-04-23 12:10:49 +10001/* $OpenBSD: session.c,v 1.203 2006/04/20 21:53:44 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 Millerf17883e2006-03-15 11:45:54 +110039#ifdef HAVE_SYS_STAT_H
40# include <sys/stat.h>
41#endif
Damien Miller9cf6d072006-03-15 11:29:24 +110042#include <sys/wait.h>
Damien Miller574c41f2006-03-15 11:40:10 +110043#include <sys/un.h>
Damien Miller03e20032006-03-15 11:16:59 +110044
Damien Miller6645e7a2006-03-15 14:42:54 +110045#ifdef HAVE_PATHS_H
Damien Miller03e20032006-03-15 11:16:59 +110046#include <paths.h>
Damien Miller6645e7a2006-03-15 14:42:54 +110047#endif
Damien Miller6ff3cad2006-03-15 11:52:09 +110048#include <signal.h>
Damien Millerb38eff82000-04-01 11:09:21 +100049
Damien Millerb38eff82000-04-01 11:09:21 +100050#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000051#include "ssh1.h"
52#include "ssh2.h"
53#include "xmalloc.h"
Ben Lindstromd95c09c2001-02-18 19:13:33 +000054#include "sshpty.h"
Damien Millerb38eff82000-04-01 11:09:21 +100055#include "packet.h"
56#include "buffer.h"
Darren Tucker46bc0752004-05-02 22:11:30 +100057#include "match.h"
Damien Millerb38eff82000-04-01 11:09:21 +100058#include "uidswap.h"
59#include "compat.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000060#include "channels.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100061#include "bufaux.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100062#include "auth.h"
Damien Millerf6d9e222000-06-18 14:50:44 +100063#include "auth-options.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000064#include "pathnames.h"
65#include "log.h"
66#include "servconf.h"
Ben Lindstromd95c09c2001-02-18 19:13:33 +000067#include "sshlogin.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000068#include "serverloop.h"
69#include "canohost.h"
Ben Lindstrom31ca54a2001-02-09 02:11:24 +000070#include "session.h"
Damien Miller9786e6e2005-07-26 21:54:56 +100071#include "kex.h"
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000072#include "monitor_wrap.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100073
Darren Tucker3c78c5e2004-01-23 22:03:10 +110074#if defined(KRB5) && defined(USE_AFS)
Damien Miller8f341f82004-01-21 11:00:46 +110075#include <kafs.h>
76#endif
77
Darren Tucker0efd1552003-08-26 11:49:55 +100078#ifdef GSSAPI
79#include "ssh-gss.h"
80#endif
81
Damien Millerb38eff82000-04-01 11:09:21 +100082/* func */
83
84Session *session_new(void);
Kevin Steves8f63caa2001-07-04 18:23:02 +000085void session_set_fds(Session *, int, int, int);
Darren Tucker3e33cec2003-10-02 16:12:36 +100086void session_pty_cleanup(Session *);
Kevin Steves8f63caa2001-07-04 18:23:02 +000087void session_proctitle(Session *);
88int session_setup_x11fwd(Session *);
89void do_exec_pty(Session *, const char *);
90void do_exec_no_pty(Session *, const char *);
91void do_exec(Session *, const char *);
92void do_login(Session *, const char *);
Kevin Stevesa0957d62001-09-27 19:50:26 +000093#ifdef LOGIN_NEEDS_UTMPX
94static void do_pre_login(Session *s);
95#endif
Kevin Steves8f63caa2001-07-04 18:23:02 +000096void do_child(Session *, const char *);
Damien Millercf205e82001-04-16 18:29:15 +100097void do_motd(void);
Kevin Steves8f63caa2001-07-04 18:23:02 +000098int check_quietlogin(Session *, const char *);
Damien Millerb38eff82000-04-01 11:09:21 +100099
Ben Lindstrombba81212001-06-25 05:01:22 +0000100static void do_authenticated1(Authctxt *);
101static void do_authenticated2(Authctxt *);
Kevin Steves8f63caa2001-07-04 18:23:02 +0000102
Ben Lindstrombba81212001-06-25 05:01:22 +0000103static int session_pty_req(Session *);
Ben Lindstromb31783d2001-03-22 02:02:12 +0000104
Damien Millerb38eff82000-04-01 11:09:21 +1000105/* import */
106extern ServerOptions options;
107extern char *__progname;
108extern int log_stderr;
109extern int debug_flag;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000110extern u_int utmp_len;
Damien Miller37023962000-07-11 17:31:38 +1000111extern int startup_pipe;
Ben Lindstrom005dd222001-04-18 15:29:33 +0000112extern void destroy_sensitive_data(void);
Darren Tuckerb9aa0a02003-07-08 22:59:59 +1000113extern Buffer loginmsg;
Damien Miller37023962000-07-11 17:31:38 +1000114
Damien Miller7b28dc52000-09-05 13:34:53 +1100115/* original command from peer. */
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000116const char *original_command = NULL;
Damien Miller7b28dc52000-09-05 13:34:53 +1100117
Damien Millerb38eff82000-04-01 11:09:21 +1000118/* data */
119#define MAX_SESSIONS 10
120Session sessions[MAX_SESSIONS];
Damien Miller15e7d4b2000-09-29 10:57:35 +1100121
Damien Millerad833b32000-08-23 10:46:23 +1000122#ifdef HAVE_LOGIN_CAP
Ben Lindstromb481e132002-03-22 01:35:47 +0000123login_cap_t *lc;
Damien Millerad833b32000-08-23 10:46:23 +1000124#endif
125
Darren Tucker3e33cec2003-10-02 16:12:36 +1000126static int is_child = 0;
127
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000128/* Name and directory of socket for authentication agent forwarding. */
129static char *auth_sock_name = NULL;
130static char *auth_sock_dir = NULL;
131
132/* removes the agent forwarding socket */
133
134static void
Darren Tucker3e33cec2003-10-02 16:12:36 +1000135auth_sock_cleanup_proc(struct passwd *pw)
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000136{
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000137 if (auth_sock_name != NULL) {
138 temporarily_use_uid(pw);
139 unlink(auth_sock_name);
140 rmdir(auth_sock_dir);
141 auth_sock_name = NULL;
142 restore_uid();
143 }
144}
145
146static int
147auth_input_request_forwarding(struct passwd * pw)
148{
149 Channel *nc;
150 int sock;
151 struct sockaddr_un sunaddr;
152
153 if (auth_sock_name != NULL) {
154 error("authentication forwarding requested twice.");
155 return 0;
156 }
157
158 /* Temporarily drop privileged uid for mkdir/bind. */
159 temporarily_use_uid(pw);
160
161 /* Allocate a buffer for the socket name, and format the name. */
162 auth_sock_name = xmalloc(MAXPATHLEN);
163 auth_sock_dir = xmalloc(MAXPATHLEN);
Darren Tucker072a7b12003-10-15 16:10:25 +1000164 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000165
166 /* Create private directory for socket */
167 if (mkdtemp(auth_sock_dir) == NULL) {
168 packet_send_debug("Agent forwarding disabled: "
169 "mkdtemp() failed: %.100s", strerror(errno));
170 restore_uid();
171 xfree(auth_sock_name);
172 xfree(auth_sock_dir);
173 auth_sock_name = NULL;
174 auth_sock_dir = NULL;
175 return 0;
176 }
Ben Lindstromce0f6342002-06-11 16:42:49 +0000177 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
178 auth_sock_dir, (long) getpid());
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000179
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000180 /* Create the socket. */
181 sock = socket(AF_UNIX, SOCK_STREAM, 0);
182 if (sock < 0)
183 packet_disconnect("socket: %.100s", strerror(errno));
184
185 /* Bind it to the name. */
186 memset(&sunaddr, 0, sizeof(sunaddr));
187 sunaddr.sun_family = AF_UNIX;
188 strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
189
Damien Miller90967402006-03-26 14:07:26 +1100190 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0)
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000191 packet_disconnect("bind: %.100s", strerror(errno));
192
193 /* Restore the privileged uid. */
194 restore_uid();
195
196 /* Start listening on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +1100197 if (listen(sock, SSH_LISTEN_BACKLOG) < 0)
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000198 packet_disconnect("listen: %.100s", strerror(errno));
199
200 /* Allocate a channel for the authentication agent socket. */
201 nc = channel_new("auth socket",
202 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
203 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000204 0, "auth socket", 1);
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000205 strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
206 return 1;
207}
208
Darren Tucker1921ed92004-02-10 13:23:28 +1100209static void
210display_loginmsg(void)
211{
Damien Miller46d38de2005-07-17 17:02:09 +1000212 if (buffer_len(&loginmsg) > 0) {
213 buffer_append(&loginmsg, "\0", 1);
214 printf("%s", (char *)buffer_ptr(&loginmsg));
215 buffer_clear(&loginmsg);
216 }
Darren Tucker1921ed92004-02-10 13:23:28 +1100217}
Ben Lindstrom8bb6f362002-06-11 15:59:02 +0000218
Ben Lindstromb31783d2001-03-22 02:02:12 +0000219void
220do_authenticated(Authctxt *authctxt)
221{
Damien Miller97f39ae2003-02-24 11:57:01 +1100222 setproctitle("%s", authctxt->pw->pw_name);
223
Ben Lindstromb31783d2001-03-22 02:02:12 +0000224 /* setup the channel layer */
225 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
226 channel_permit_all_opens();
227
228 if (compat20)
229 do_authenticated2(authctxt);
230 else
231 do_authenticated1(authctxt);
Ben Lindstrom838394c2001-06-09 01:11:59 +0000232
Darren Tucker3e33cec2003-10-02 16:12:36 +1000233 do_cleanup(authctxt);
Ben Lindstromb31783d2001-03-22 02:02:12 +0000234}
235
Damien Millerb38eff82000-04-01 11:09:21 +1000236/*
Damien Millerb38eff82000-04-01 11:09:21 +1000237 * Prepares for an interactive session. This is called after the user has
238 * been successfully authenticated. During this message exchange, pseudo
239 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
240 * are requested, etc.
241 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000242static void
Ben Lindstromb31783d2001-03-22 02:02:12 +0000243do_authenticated1(Authctxt *authctxt)
Damien Millerb38eff82000-04-01 11:09:21 +1000244{
245 Session *s;
Damien Millerb38eff82000-04-01 11:09:21 +1000246 char *command;
Damien Millerdff50992002-01-22 23:16:32 +1100247 int success, type, screen_flag;
Ben Lindstrome23f4a32002-06-23 21:40:16 +0000248 int enable_compression_after_reply = 0;
249 u_int proto_len, data_len, dlen, compression_level = 0;
Damien Millerb38eff82000-04-01 11:09:21 +1000250
251 s = session_new();
Darren Tucker172a5e82005-01-20 10:55:46 +1100252 if (s == NULL) {
253 error("no more sessions");
254 return;
255 }
Ben Lindstromec95ed92001-07-04 04:21:14 +0000256 s->authctxt = authctxt;
Ben Lindstromb31783d2001-03-22 02:02:12 +0000257 s->pw = authctxt->pw;
Damien Millerad833b32000-08-23 10:46:23 +1000258
Damien Millerb38eff82000-04-01 11:09:21 +1000259 /*
260 * We stay in this loop until the client requests to execute a shell
261 * or a command.
262 */
263 for (;;) {
Ben Lindstromb31783d2001-03-22 02:02:12 +0000264 success = 0;
Damien Millerb38eff82000-04-01 11:09:21 +1000265
266 /* Get a packet from the client. */
Damien Millerdff50992002-01-22 23:16:32 +1100267 type = packet_read();
Damien Millerb38eff82000-04-01 11:09:21 +1000268
269 /* Process the packet. */
270 switch (type) {
271 case SSH_CMSG_REQUEST_COMPRESSION:
Damien Millerb38eff82000-04-01 11:09:21 +1000272 compression_level = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +1100273 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +1000274 if (compression_level < 1 || compression_level > 9) {
Darren Tucker5cb30ad2004-08-12 22:40:24 +1000275 packet_send_debug("Received invalid compression level %d.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100276 compression_level);
Damien Millerb38eff82000-04-01 11:09:21 +1000277 break;
278 }
Damien Miller9786e6e2005-07-26 21:54:56 +1000279 if (options.compression == COMP_NONE) {
Ben Lindstrom23e0f662002-06-21 01:09:47 +0000280 debug2("compression disabled");
281 break;
282 }
Damien Millerb38eff82000-04-01 11:09:21 +1000283 /* Enable compression after we have responded with SUCCESS. */
284 enable_compression_after_reply = 1;
285 success = 1;
286 break;
287
288 case SSH_CMSG_REQUEST_PTY:
Ben Lindstrom49c12602001-06-13 04:37:36 +0000289 success = session_pty_req(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000290 break;
291
292 case SSH_CMSG_X11_REQUEST_FORWARDING:
Damien Millerb38eff82000-04-01 11:09:21 +1000293 s->auth_proto = packet_get_string(&proto_len);
294 s->auth_data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +1000295
Ben Lindstrom7603b2d2001-02-26 20:13:32 +0000296 screen_flag = packet_get_protocol_flags() &
297 SSH_PROTOFLAG_SCREEN_NUMBER;
298 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
299
300 if (packet_remaining() == 4) {
301 if (!screen_flag)
302 debug2("Buggy client: "
303 "X11 screen flag missing");
Damien Millerb38eff82000-04-01 11:09:21 +1000304 s->screen = packet_get_int();
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000305 } else {
Damien Millerb38eff82000-04-01 11:09:21 +1000306 s->screen = 0;
Ben Lindstrom8dcdeb82001-02-16 16:02:14 +0000307 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100308 packet_check_eom();
Ben Lindstrom768176b2001-06-09 01:29:12 +0000309 success = session_setup_x11fwd(s);
310 if (!success) {
311 xfree(s->auth_proto);
312 xfree(s->auth_data);
Ben Lindstrom88259fb2001-06-12 00:21:34 +0000313 s->auth_proto = NULL;
314 s->auth_data = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +1000315 }
Damien Millerb38eff82000-04-01 11:09:21 +1000316 break;
Damien Millerb38eff82000-04-01 11:09:21 +1000317
318 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
319 if (no_agent_forwarding_flag || compat13) {
320 debug("Authentication agent forwarding not permitted for this authentication.");
321 break;
322 }
323 debug("Received authentication agent forwarding request.");
Ben Lindstromb31783d2001-03-22 02:02:12 +0000324 success = auth_input_request_forwarding(s->pw);
Damien Millerb38eff82000-04-01 11:09:21 +1000325 break;
326
327 case SSH_CMSG_PORT_FORWARD_REQUEST:
328 if (no_port_forwarding_flag) {
329 debug("Port forwarding not permitted for this authentication.");
330 break;
331 }
Damien Miller50a41ed2000-10-16 12:14:42 +1100332 if (!options.allow_tcp_forwarding) {
333 debug("Port forwarding not permitted.");
334 break;
335 }
Damien Millerb38eff82000-04-01 11:09:21 +1000336 debug("Received TCP/IP port forwarding request.");
Ben Lindstromb31783d2001-03-22 02:02:12 +0000337 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
Damien Millerb38eff82000-04-01 11:09:21 +1000338 success = 1;
339 break;
340
341 case SSH_CMSG_MAX_PACKET_SIZE:
342 if (packet_set_maxsize(packet_get_int()) > 0)
343 success = 1;
344 break;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100345
Damien Millerb38eff82000-04-01 11:09:21 +1000346 case SSH_CMSG_EXEC_SHELL:
347 case SSH_CMSG_EXEC_CMD:
Damien Millerb38eff82000-04-01 11:09:21 +1000348 if (type == SSH_CMSG_EXEC_CMD) {
349 command = packet_get_string(&dlen);
350 debug("Exec command '%.500s'", command);
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000351 do_exec(s, command);
352 xfree(command);
Damien Millerb38eff82000-04-01 11:09:21 +1000353 } else {
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000354 do_exec(s, NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000355 }
Damien Miller48b03fc2002-01-22 23:11:40 +1100356 packet_check_eom();
Ben Lindstromcb3929d2001-06-09 01:34:15 +0000357 session_close(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000358 return;
359
360 default:
361 /*
362 * Any unknown messages in this phase are ignored,
363 * and a failure message is returned.
364 */
Damien Miller996acd22003-04-09 20:59:48 +1000365 logit("Unknown packet type received after authentication: %d", type);
Damien Millerb38eff82000-04-01 11:09:21 +1000366 }
367 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
368 packet_send();
369 packet_write_wait();
370
371 /* Enable compression now that we have replied if appropriate. */
372 if (enable_compression_after_reply) {
373 enable_compression_after_reply = 0;
374 packet_start_compression(compression_level);
375 }
376 }
377}
378
379/*
380 * This is called to fork and execute a command when we have no tty. This
381 * will call do_child from the child, and server_loop from the parent after
382 * setting up file descriptors and such.
383 */
Damien Miller4af51302000-04-16 11:18:38 +1000384void
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000385do_exec_no_pty(Session *s, const char *command)
Damien Millerb38eff82000-04-01 11:09:21 +1000386{
Ben Lindstromce0f6342002-06-11 16:42:49 +0000387 pid_t pid;
Damien Millerb38eff82000-04-01 11:09:21 +1000388
389#ifdef USE_PIPES
390 int pin[2], pout[2], perr[2];
391 /* Allocate pipes for communicating with the program. */
392 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
393 packet_disconnect("Could not create pipes: %.100s",
394 strerror(errno));
395#else /* USE_PIPES */
396 int inout[2], err[2];
397 /* Uses socket pairs to communicate with the program. */
398 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
399 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
400 packet_disconnect("Could not create socket pairs: %.100s",
401 strerror(errno));
402#endif /* USE_PIPES */
403 if (s == NULL)
404 fatal("do_exec_no_pty: no session");
405
Damien Millere247cc42000-05-07 12:03:14 +1000406 session_proctitle(s);
Damien Millerb38eff82000-04-01 11:09:21 +1000407
Damien Millerc5946332001-02-28 11:46:11 +1100408#if defined(USE_PAM)
Darren Tucker1825f262004-02-24 00:01:27 +1100409 if (options.use_pam && !use_privsep)
Damien Miller4e448a32003-05-14 15:11:48 +1000410 do_pam_setcred(1);
Kevin Stevesff793a22001-02-21 16:36:51 +0000411#endif /* USE_PAM */
412
Damien Millerb38eff82000-04-01 11:09:21 +1000413 /* Fork the child. */
414 if ((pid = fork()) == 0) {
Darren Tucker3e33cec2003-10-02 16:12:36 +1000415 is_child = 1;
Ben Lindstrom264ee302002-07-23 21:01:56 +0000416
Damien Millerb38eff82000-04-01 11:09:21 +1000417 /* Child. Reinitialize the log since the pid has changed. */
418 log_init(__progname, options.log_level, options.log_facility, log_stderr);
419
420 /*
421 * Create a new session and process group since the 4.4BSD
422 * setlogin() affects the entire process group.
423 */
424 if (setsid() < 0)
425 error("setsid failed: %.100s", strerror(errno));
426
427#ifdef USE_PIPES
428 /*
429 * Redirect stdin. We close the parent side of the socket
430 * pair, and make the child side the standard input.
431 */
432 close(pin[1]);
433 if (dup2(pin[0], 0) < 0)
434 perror("dup2 stdin");
435 close(pin[0]);
436
437 /* Redirect stdout. */
438 close(pout[0]);
439 if (dup2(pout[1], 1) < 0)
440 perror("dup2 stdout");
441 close(pout[1]);
442
443 /* Redirect stderr. */
444 close(perr[0]);
445 if (dup2(perr[1], 2) < 0)
446 perror("dup2 stderr");
447 close(perr[1]);
448#else /* USE_PIPES */
449 /*
450 * Redirect stdin, stdout, and stderr. Stdin and stdout will
451 * use the same socket, as some programs (particularly rdist)
452 * seem to depend on it.
453 */
454 close(inout[1]);
455 close(err[1]);
456 if (dup2(inout[0], 0) < 0) /* stdin */
457 perror("dup2 stdin");
458 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
459 perror("dup2 stdout");
460 if (dup2(err[0], 2) < 0) /* stderr */
461 perror("dup2 stderr");
462#endif /* USE_PIPES */
463
Tim Rice81ed5182002-09-25 17:38:46 -0700464#ifdef _UNICOS
465 cray_init_job(s->pw); /* set up cray jid and tmpdir */
466#endif
467
Damien Millerb38eff82000-04-01 11:09:21 +1000468 /* Do processing for the child (exec command etc). */
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000469 do_child(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000470 /* NOTREACHED */
471 }
Tim Rice81ed5182002-09-25 17:38:46 -0700472#ifdef _UNICOS
473 signal(WJSIGNAL, cray_job_termination_handler);
474#endif /* _UNICOS */
Damien Millerbac2d8a2000-09-05 16:13:06 +1100475#ifdef HAVE_CYGWIN
476 if (is_winnt)
477 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
478#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000479 if (pid < 0)
480 packet_disconnect("fork failed: %.100s", strerror(errno));
481 s->pid = pid;
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000482 /* Set interactive/non-interactive mode. */
483 packet_set_interactive(s->display != NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000484#ifdef USE_PIPES
485 /* We are the parent. Close the child sides of the pipes. */
486 close(pin[0]);
487 close(pout[1]);
488 close(perr[1]);
489
Damien Millerefb4afe2000-04-12 18:45:05 +1000490 if (compat20) {
Darren Tucker723e9452004-06-22 12:57:08 +1000491 if (s->is_subsystem) {
492 close(perr[0]);
493 perr[0] = -1;
494 }
495 session_set_fds(s, pin[1], pout[0], perr[0]);
Damien Millerefb4afe2000-04-12 18:45:05 +1000496 } else {
497 /* Enter the interactive session. */
498 server_loop(pid, pin[1], pout[0], perr[0]);
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000499 /* server_loop has closed pin[1], pout[0], and perr[0]. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000500 }
Damien Millerb38eff82000-04-01 11:09:21 +1000501#else /* USE_PIPES */
502 /* We are the parent. Close the child sides of the socket pairs. */
503 close(inout[0]);
504 close(err[0]);
505
506 /*
Darren Tuckerb3850592004-03-27 16:44:21 +1100507 * Clear loginmsg, since it's the child's responsibility to display
508 * it to the user, otherwise multiple sessions may accumulate
509 * multiple copies of the login messages.
510 */
511 buffer_clear(&loginmsg);
512
513 /*
Damien Millerb38eff82000-04-01 11:09:21 +1000514 * Enter the interactive session. Note: server_loop must be able to
515 * handle the case that fdin and fdout are the same.
516 */
Damien Millerefb4afe2000-04-12 18:45:05 +1000517 if (compat20) {
Ben Lindstromfc9b07d2001-03-22 01:27:23 +0000518 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
Damien Millerefb4afe2000-04-12 18:45:05 +1000519 } else {
520 server_loop(pid, inout[1], inout[1], err[1]);
521 /* server_loop has closed inout[1] and err[1]. */
522 }
Damien Millerb38eff82000-04-01 11:09:21 +1000523#endif /* USE_PIPES */
524}
525
526/*
527 * This is called to fork and execute a command when we have a tty. This
528 * will call do_child from the child, and server_loop from the parent after
529 * setting up file descriptors, controlling tty, updating wtmp, utmp,
530 * lastlog, and other such operations.
531 */
Damien Miller4af51302000-04-16 11:18:38 +1000532void
Ben Lindstromb4c961d2001-03-22 01:25:37 +0000533do_exec_pty(Session *s, const char *command)
Damien Millerb38eff82000-04-01 11:09:21 +1000534{
Damien Millerb38eff82000-04-01 11:09:21 +1000535 int fdout, ptyfd, ttyfd, ptymaster;
Damien Millerb38eff82000-04-01 11:09:21 +1000536 pid_t pid;
Damien Millerb38eff82000-04-01 11:09:21 +1000537
538 if (s == NULL)
539 fatal("do_exec_pty: no session");
540 ptyfd = s->ptyfd;
541 ttyfd = s->ttyfd;
542
Damien Millerc5946332001-02-28 11:46:11 +1100543#if defined(USE_PAM)
Damien Miller4e448a32003-05-14 15:11:48 +1000544 if (options.use_pam) {
Damien Miller341c6e62003-09-02 23:18:52 +1000545 do_pam_set_tty(s->tty);
Darren Tuckeref3a4a22004-02-06 15:30:50 +1100546 if (!use_privsep)
547 do_pam_setcred(1);
Damien Miller4e448a32003-05-14 15:11:48 +1000548 }
Damien Miller5a761312001-02-27 09:28:23 +1100549#endif
Kevin Stevesff793a22001-02-21 16:36:51 +0000550
Damien Millerb38eff82000-04-01 11:09:21 +1000551 /* Fork the child. */
552 if ((pid = fork()) == 0) {
Darren Tucker3e33cec2003-10-02 16:12:36 +1000553 is_child = 1;
Ben Lindstrombddd5512001-07-04 04:53:53 +0000554
Damien Miller942da032000-08-18 13:59:06 +1000555 /* Child. Reinitialize the log because the pid has changed. */
Damien Millerb38eff82000-04-01 11:09:21 +1000556 log_init(__progname, options.log_level, options.log_facility, log_stderr);
Damien Millerb38eff82000-04-01 11:09:21 +1000557 /* Close the master side of the pseudo tty. */
558 close(ptyfd);
559
560 /* Make the pseudo tty our controlling tty. */
561 pty_make_controlling_tty(&ttyfd, s->tty);
562
Damien Miller9c751422001-10-10 15:02:46 +1000563 /* Redirect stdin/stdout/stderr from the pseudo tty. */
564 if (dup2(ttyfd, 0) < 0)
565 error("dup2 stdin: %s", strerror(errno));
566 if (dup2(ttyfd, 1) < 0)
567 error("dup2 stdout: %s", strerror(errno));
568 if (dup2(ttyfd, 2) < 0)
569 error("dup2 stderr: %s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +1000570
571 /* Close the extra descriptor for the pseudo tty. */
572 close(ttyfd);
573
Damien Miller942da032000-08-18 13:59:06 +1000574 /* record login, etc. similar to login(1) */
Damien Miller364a9bd2001-04-16 18:37:05 +1000575#ifndef HAVE_OSF_SIA
Tim Rice81ed5182002-09-25 17:38:46 -0700576 if (!(options.use_login && command == NULL)) {
577#ifdef _UNICOS
578 cray_init_job(s->pw); /* set up cray jid and tmpdir */
579#endif /* _UNICOS */
Damien Miller69b69aa2000-10-28 14:19:58 +1100580 do_login(s, command);
Tim Rice81ed5182002-09-25 17:38:46 -0700581 }
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000582# ifdef LOGIN_NEEDS_UTMPX
583 else
584 do_pre_login(s);
585# endif
Damien Miller364a9bd2001-04-16 18:37:05 +1000586#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000587
Damien Millerb38eff82000-04-01 11:09:21 +1000588 /* Do common processing for the child, such as execing the command. */
Ben Lindstrom86fe8682001-03-17 00:32:57 +0000589 do_child(s, command);
Damien Millerb38eff82000-04-01 11:09:21 +1000590 /* NOTREACHED */
591 }
Tim Rice81ed5182002-09-25 17:38:46 -0700592#ifdef _UNICOS
593 signal(WJSIGNAL, cray_job_termination_handler);
594#endif /* _UNICOS */
Damien Millerbac2d8a2000-09-05 16:13:06 +1100595#ifdef HAVE_CYGWIN
596 if (is_winnt)
597 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
598#endif
Damien Millerb38eff82000-04-01 11:09:21 +1000599 if (pid < 0)
600 packet_disconnect("fork failed: %.100s", strerror(errno));
601 s->pid = pid;
602
603 /* Parent. Close the slave side of the pseudo tty. */
604 close(ttyfd);
605
606 /*
607 * Create another descriptor of the pty master side for use as the
608 * standard input. We could use the original descriptor, but this
609 * simplifies code in server_loop. The descriptor is bidirectional.
610 */
611 fdout = dup(ptyfd);
612 if (fdout < 0)
613 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
614
615 /* we keep a reference to the pty master */
616 ptymaster = dup(ptyfd);
617 if (ptymaster < 0)
618 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
619 s->ptymaster = ptymaster;
620
621 /* Enter interactive session. */
Ben Lindstrombf555ba2001-01-18 02:04:35 +0000622 packet_set_interactive(1);
Damien Millerefb4afe2000-04-12 18:45:05 +1000623 if (compat20) {
624 session_set_fds(s, ptyfd, fdout, -1);
625 } else {
626 server_loop(pid, ptyfd, fdout, -1);
627 /* server_loop _has_ closed ptyfd and fdout. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000628 }
Damien Millerb38eff82000-04-01 11:09:21 +1000629}
630
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000631#ifdef LOGIN_NEEDS_UTMPX
Damien Miller599d8eb2001-09-15 12:25:53 +1000632static void
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000633do_pre_login(Session *s)
634{
635 socklen_t fromlen;
636 struct sockaddr_storage from;
637 pid_t pid = getpid();
638
639 /*
640 * Get IP address of client. If the connection is not a socket, let
641 * the address be 0.0.0.0.
642 */
643 memset(&from, 0, sizeof(from));
Damien Millerebc23062002-09-04 16:45:09 +1000644 fromlen = sizeof(from);
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000645 if (packet_connection_is_on_socket()) {
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000646 if (getpeername(packet_get_connection_in(),
Damien Miller90967402006-03-26 14:07:26 +1100647 (struct sockaddr *)&from, &fromlen) < 0) {
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000648 debug("getpeername: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +1000649 cleanup_exit(255);
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000650 }
651 }
652
653 record_utmp_only(pid, s->tty, s->pw->pw_name,
Damien Miller3a961dc2003-06-03 10:25:48 +1000654 get_remote_name_or_ip(utmp_len, options.use_dns),
Kevin Steves678ee512003-01-01 23:43:55 +0000655 (struct sockaddr *)&from, fromlen);
Ben Lindstrom97c677d2001-05-08 20:33:05 +0000656}
657#endif
658
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000659/*
660 * This is called to fork and execute a command. If another command is
661 * to be forced, execute that instead.
662 */
663void
664do_exec(Session *s, const char *command)
665{
666 if (forced_command) {
667 original_command = command;
668 command = forced_command;
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000669 debug("Forced command '%.900s'", command);
670 }
671
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100672#ifdef SSH_AUDIT_EVENTS
Darren Tucker269a1ea2005-02-03 00:20:53 +1100673 if (command != NULL)
674 PRIVSEP(audit_run_command(command));
675 else if (s->ttyfd == -1) {
676 char *shell = s->pw->pw_shell;
677
678 if (shell[0] == '\0') /* empty shell means /bin/sh */
679 shell =_PATH_BSHELL;
680 PRIVSEP(audit_run_command(shell));
681 }
682#endif
683
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000684 if (s->ttyfd != -1)
685 do_exec_pty(s, command);
686 else
687 do_exec_no_pty(s, command);
688
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +0000689 original_command = NULL;
Ben Lindstromc85ab8a2001-06-21 03:13:10 +0000690
Darren Tucker09991742004-07-17 17:05:14 +1000691 /*
692 * Clear loginmsg: it's the child's responsibility to display
693 * it to the user, otherwise multiple sessions may accumulate
694 * multiple copies of the login messages.
695 */
696 buffer_clear(&loginmsg);
697}
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000698
Damien Miller942da032000-08-18 13:59:06 +1000699/* administrative, login(1)-like work */
700void
Damien Miller69b69aa2000-10-28 14:19:58 +1100701do_login(Session *s, const char *command)
Damien Miller942da032000-08-18 13:59:06 +1000702{
Damien Miller942da032000-08-18 13:59:06 +1000703 socklen_t fromlen;
704 struct sockaddr_storage from;
Damien Miller942da032000-08-18 13:59:06 +1000705 struct passwd * pw = s->pw;
706 pid_t pid = getpid();
707
708 /*
709 * Get IP address of client. If the connection is not a socket, let
710 * the address be 0.0.0.0.
711 */
712 memset(&from, 0, sizeof(from));
Kevin Steves678ee512003-01-01 23:43:55 +0000713 fromlen = sizeof(from);
Damien Miller942da032000-08-18 13:59:06 +1000714 if (packet_connection_is_on_socket()) {
Damien Miller942da032000-08-18 13:59:06 +1000715 if (getpeername(packet_get_connection_in(),
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000716 (struct sockaddr *) & from, &fromlen) < 0) {
Damien Miller942da032000-08-18 13:59:06 +1000717 debug("getpeername: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +1000718 cleanup_exit(255);
Damien Miller942da032000-08-18 13:59:06 +1000719 }
720 }
721
722 /* Record that there was a login on that tty from the remote host. */
Ben Lindstrom2bf56e22002-04-02 20:32:46 +0000723 if (!use_privsep)
724 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
725 get_remote_name_or_ip(utmp_len,
Damien Miller3a961dc2003-06-03 10:25:48 +1000726 options.use_dns),
Damien Millerebc23062002-09-04 16:45:09 +1000727 (struct sockaddr *)&from, fromlen);
Damien Miller942da032000-08-18 13:59:06 +1000728
Kevin Steves092f2ef2000-10-14 13:36:13 +0000729#ifdef USE_PAM
730 /*
731 * If password change is needed, do it now.
732 * This needs to occur before the ~/.hushlogin check.
733 */
Darren Tucker1921ed92004-02-10 13:23:28 +1100734 if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) {
735 display_loginmsg();
Kevin Steves092f2ef2000-10-14 13:36:13 +0000736 do_pam_chauthtok();
Darren Tucker1921ed92004-02-10 13:23:28 +1100737 s->authctxt->force_pwchange = 0;
Damien Miller1f499fd2003-08-25 13:08:49 +1000738 /* XXX - signal [net] parent to enable forwardings */
Kevin Steves092f2ef2000-10-14 13:36:13 +0000739 }
740#endif
741
Damien Millercf205e82001-04-16 18:29:15 +1000742 if (check_quietlogin(s, command))
Damien Miller942da032000-08-18 13:59:06 +1000743 return;
744
Darren Tucker1921ed92004-02-10 13:23:28 +1100745 display_loginmsg();
Damien Miller942da032000-08-18 13:59:06 +1000746
Damien Millercf205e82001-04-16 18:29:15 +1000747 do_motd();
748}
749
750/*
751 * Display the message of the day.
752 */
753void
754do_motd(void)
755{
756 FILE *f;
757 char buf[256];
758
Damien Miller942da032000-08-18 13:59:06 +1000759 if (options.print_motd) {
Damien Millerad833b32000-08-23 10:46:23 +1000760#ifdef HAVE_LOGIN_CAP
761 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
762 "/etc/motd"), "r");
763#else
Damien Miller942da032000-08-18 13:59:06 +1000764 f = fopen("/etc/motd", "r");
Damien Millerad833b32000-08-23 10:46:23 +1000765#endif
Damien Miller942da032000-08-18 13:59:06 +1000766 if (f) {
767 while (fgets(buf, sizeof(buf), f))
768 fputs(buf, stdout);
769 fclose(f);
770 }
771 }
772}
773
Kevin Steves8f63caa2001-07-04 18:23:02 +0000774
775/*
776 * Check for quiet login, either .hushlogin or command given.
777 */
778int
779check_quietlogin(Session *s, const char *command)
780{
781 char buf[256];
782 struct passwd *pw = s->pw;
783 struct stat st;
784
785 /* Return 1 if .hushlogin exists or a command given. */
786 if (command != NULL)
787 return 1;
788 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
789#ifdef HAVE_LOGIN_CAP
790 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
791 return 1;
792#else
793 if (stat(buf, &st) >= 0)
794 return 1;
795#endif
796 return 0;
797}
798
Damien Millerb38eff82000-04-01 11:09:21 +1000799/*
800 * Sets the value of the given variable in the environment. If the variable
801 * already exists, its value is overriden.
802 */
Darren Tucker0efd1552003-08-26 11:49:55 +1000803void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000804child_set_env(char ***envp, u_int *envsizep, const char *name,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100805 const char *value)
Damien Millerb38eff82000-04-01 11:09:21 +1000806{
Damien Millerb38eff82000-04-01 11:09:21 +1000807 char **env;
Darren Tuckerfb16b242003-09-22 21:04:23 +1000808 u_int envsize;
809 u_int i, namelen;
Damien Millerb38eff82000-04-01 11:09:21 +1000810
811 /*
Darren Tuckere1a790d2003-09-16 11:52:19 +1000812 * If we're passed an uninitialized list, allocate a single null
813 * entry before continuing.
814 */
815 if (*envp == NULL && *envsizep == 0) {
816 *envp = xmalloc(sizeof(char *));
817 *envp[0] = NULL;
818 *envsizep = 1;
819 }
820
821 /*
Damien Millerb38eff82000-04-01 11:09:21 +1000822 * Find the slot where the value should be stored. If the variable
823 * already exists, we reuse the slot; otherwise we append a new slot
824 * at the end of the array, expanding if necessary.
825 */
826 env = *envp;
827 namelen = strlen(name);
828 for (i = 0; env[i]; i++)
829 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
830 break;
831 if (env[i]) {
832 /* Reuse the slot. */
833 xfree(env[i]);
834 } else {
835 /* New variable. Expand if necessary. */
Darren Tuckerfb16b242003-09-22 21:04:23 +1000836 envsize = *envsizep;
837 if (i >= envsize - 1) {
838 if (envsize >= 1000)
839 fatal("child_set_env: too many env vars");
840 envsize += 50;
Damien Miller36812092006-03-26 14:22:47 +1100841 env = (*envp) = xrealloc(env, envsize, sizeof(char *));
Darren Tuckerfb16b242003-09-22 21:04:23 +1000842 *envsizep = envsize;
Damien Millerb38eff82000-04-01 11:09:21 +1000843 }
844 /* Need to set the NULL pointer at end of array beyond the new slot. */
845 env[i + 1] = NULL;
846 }
847
848 /* Allocate space and format the variable in the appropriate slot. */
849 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
850 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
851}
852
853/*
854 * Reads environment variables from the given file and adds/overrides them
855 * into the environment. If the file does not exist, this does nothing.
856 * Otherwise, it must consist of empty lines, comments (line starts with '#')
857 * and assignments of the form name=value. No other forms are allowed.
858 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000859static void
Ben Lindstrom46c16222000-12-22 01:43:59 +0000860read_environment_file(char ***env, u_int *envsize,
Damien Miller9f0f5c62001-12-21 14:45:46 +1100861 const char *filename)
Damien Millerb38eff82000-04-01 11:09:21 +1000862{
863 FILE *f;
864 char buf[4096];
865 char *cp, *value;
Damien Miller990070a2002-06-26 23:51:06 +1000866 u_int lineno = 0;
Damien Millerb38eff82000-04-01 11:09:21 +1000867
868 f = fopen(filename, "r");
869 if (!f)
870 return;
871
872 while (fgets(buf, sizeof(buf), f)) {
Damien Miller990070a2002-06-26 23:51:06 +1000873 if (++lineno > 1000)
874 fatal("Too many lines in environment file %s", filename);
Damien Millerb38eff82000-04-01 11:09:21 +1000875 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
876 ;
877 if (!*cp || *cp == '#' || *cp == '\n')
878 continue;
879 if (strchr(cp, '\n'))
880 *strchr(cp, '\n') = '\0';
881 value = strchr(cp, '=');
882 if (value == NULL) {
Damien Miller990070a2002-06-26 23:51:06 +1000883 fprintf(stderr, "Bad line %u in %.100s\n", lineno,
884 filename);
Damien Millerb38eff82000-04-01 11:09:21 +1000885 continue;
886 }
Damien Millerb1715dc2000-05-30 13:44:51 +1000887 /*
888 * Replace the equals sign by nul, and advance value to
889 * the value string.
890 */
Damien Millerb38eff82000-04-01 11:09:21 +1000891 *value = '\0';
892 value++;
893 child_set_env(env, envsize, cp, value);
894 }
895 fclose(f);
896}
897
Darren Tuckere1a790d2003-09-16 11:52:19 +1000898#ifdef HAVE_ETC_DEFAULT_LOGIN
899/*
900 * Return named variable from specified environment, or NULL if not present.
901 */
902static char *
903child_get_env(char **env, const char *name)
904{
905 int i;
906 size_t len;
907
908 len = strlen(name);
909 for (i=0; env[i] != NULL; i++)
910 if (strncmp(name, env[i], len) == 0 && env[i][len] == '=')
911 return(env[i] + len + 1);
912 return NULL;
913}
914
915/*
916 * Read /etc/default/login.
917 * We pick up the PATH (or SUPATH for root) and UMASK.
918 */
919static void
920read_etc_default_login(char ***env, u_int *envsize, uid_t uid)
921{
922 char **tmpenv = NULL, *var;
Darren Tuckerc11b1e82003-09-19 20:56:51 +1000923 u_int i, tmpenvsize = 0;
Darren Tuckerf391ba62003-10-02 20:07:09 +1000924 u_long mask;
Darren Tuckere1a790d2003-09-16 11:52:19 +1000925
926 /*
927 * We don't want to copy the whole file to the child's environment,
928 * so we use a temporary environment and copy the variables we're
929 * interested in.
930 */
931 read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login");
932
Darren Tuckerc11b1e82003-09-19 20:56:51 +1000933 if (tmpenv == NULL)
934 return;
935
Darren Tuckere1a790d2003-09-16 11:52:19 +1000936 if (uid == 0)
937 var = child_get_env(tmpenv, "SUPATH");
938 else
939 var = child_get_env(tmpenv, "PATH");
940 if (var != NULL)
941 child_set_env(env, envsize, "PATH", var);
Damien Miller787b2ec2003-11-21 23:56:47 +1100942
Darren Tuckere1a790d2003-09-16 11:52:19 +1000943 if ((var = child_get_env(tmpenv, "UMASK")) != NULL)
944 if (sscanf(var, "%5lo", &mask) == 1)
Darren Tuckerf391ba62003-10-02 20:07:09 +1000945 umask((mode_t)mask);
Damien Miller787b2ec2003-11-21 23:56:47 +1100946
Darren Tuckere1a790d2003-09-16 11:52:19 +1000947 for (i = 0; tmpenv[i] != NULL; i++)
948 xfree(tmpenv[i]);
949 xfree(tmpenv);
950}
951#endif /* HAVE_ETC_DEFAULT_LOGIN */
952
Damien Miller7dff8692005-05-26 11:34:51 +1000953void
954copy_environment(char **source, char ***env, u_int *envsize)
Damien Millerb38eff82000-04-01 11:09:21 +1000955{
Damien Millerbb9ffc12002-01-08 10:59:32 +1100956 char *var_name, *var_val;
Damien Millerb38eff82000-04-01 11:09:21 +1000957 int i;
958
Damien Millerbb9ffc12002-01-08 10:59:32 +1100959 if (source == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +1000960 return;
Kevin Stevesef4eea92001-02-05 12:42:17 +0000961
Damien Millerbb9ffc12002-01-08 10:59:32 +1100962 for(i = 0; source[i] != NULL; i++) {
963 var_name = xstrdup(source[i]);
964 if ((var_val = strstr(var_name, "=")) == NULL) {
965 xfree(var_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000966 continue;
Damien Millerb38eff82000-04-01 11:09:21 +1000967 }
Damien Millerbb9ffc12002-01-08 10:59:32 +1100968 *var_val++ = '\0';
969
970 debug3("Copy environment: %s=%s", var_name, var_val);
971 child_set_env(env, envsize, var_name, var_val);
Damien Miller787b2ec2003-11-21 23:56:47 +1100972
Damien Millerbb9ffc12002-01-08 10:59:32 +1100973 xfree(var_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000974 }
975}
Damien Millercb5e44a2000-09-29 12:12:36 +1100976
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000977static char **
978do_setup_env(Session *s, const char *shell)
Damien Millerb38eff82000-04-01 11:09:21 +1000979{
Damien Millerb38eff82000-04-01 11:09:21 +1000980 char buf[256];
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000981 u_int i, envsize;
Darren Tuckere1a790d2003-09-16 11:52:19 +1000982 char **env, *laddr, *path = NULL;
Ben Lindstrom4e97e852002-02-19 21:50:43 +0000983 struct passwd *pw = s->pw;
Damien Millerb38eff82000-04-01 11:09:21 +1000984
Damien Millerb38eff82000-04-01 11:09:21 +1000985 /* Initialize the environment. */
986 envsize = 100;
Darren Tuckerd8093e42006-05-04 16:24:34 +1000987 env = xcalloc(envsize, sizeof(char *));
Damien Millerb38eff82000-04-01 11:09:21 +1000988 env[0] = NULL;
989
Damien Millerbac2d8a2000-09-05 16:13:06 +1100990#ifdef HAVE_CYGWIN
991 /*
992 * The Windows environment contains some setting which are
993 * important for a running system. They must not be dropped.
994 */
Darren Tucker14c372d2004-08-30 20:42:08 +1000995 {
996 char **p;
997
998 p = fetch_windows_environment();
999 copy_environment(p, &env, &envsize);
1000 free_windows_environment(p);
1001 }
Damien Millerbac2d8a2000-09-05 16:13:06 +11001002#endif
1003
Darren Tucker0efd1552003-08-26 11:49:55 +10001004#ifdef GSSAPI
Damien Millera8e06ce2003-11-21 23:48:55 +11001005 /* Allow any GSSAPI methods that we've used to alter
Darren Tucker0efd1552003-08-26 11:49:55 +10001006 * the childs environment as they see fit
1007 */
1008 ssh_gssapi_do_child(&env, &envsize);
1009#endif
1010
Damien Millerb38eff82000-04-01 11:09:21 +10001011 if (!options.use_login) {
1012 /* Set basic environment. */
Darren Tucker46bc0752004-05-02 22:11:30 +10001013 for (i = 0; i < s->num_env; i++)
Darren Tuckerfc959702004-07-17 16:12:08 +10001014 child_set_env(&env, &envsize, s->env[i].name,
Darren Tucker46bc0752004-05-02 22:11:30 +10001015 s->env[i].val);
1016
Damien Millerb38eff82000-04-01 11:09:21 +10001017 child_set_env(&env, &envsize, "USER", pw->pw_name);
1018 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
Damien Millerdfedbf82003-01-03 14:52:53 +11001019#ifdef _AIX
1020 child_set_env(&env, &envsize, "LOGIN", pw->pw_name);
1021#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001022 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
Damien Millerad833b32000-08-23 10:46:23 +10001023#ifdef HAVE_LOGIN_CAP
Ben Lindstromb9051ec2002-07-23 21:11:09 +00001024 if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
1025 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1026 else
1027 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
Damien Millercb5e44a2000-09-29 12:12:36 +11001028#else /* HAVE_LOGIN_CAP */
1029# ifndef HAVE_CYGWIN
Damien Millerbac2d8a2000-09-05 16:13:06 +11001030 /*
1031 * There's no standard path on Windows. The path contains
1032 * important components pointing to the system directories,
1033 * needed for loading shared libraries. So the path better
1034 * remains intact here.
1035 */
Darren Tuckere1a790d2003-09-16 11:52:19 +10001036# ifdef HAVE_ETC_DEFAULT_LOGIN
1037 read_etc_default_login(&env, &envsize, pw->pw_uid);
1038 path = child_get_env(env, "PATH");
1039# endif /* HAVE_ETC_DEFAULT_LOGIN */
1040 if (path == NULL || *path == '\0') {
Damien Millera8e06ce2003-11-21 23:48:55 +11001041 child_set_env(&env, &envsize, "PATH",
Darren Tuckere1a790d2003-09-16 11:52:19 +10001042 s->pw->pw_uid == 0 ?
1043 SUPERUSER_PATH : _PATH_STDPATH);
1044 }
Damien Millercb5e44a2000-09-29 12:12:36 +11001045# endif /* HAVE_CYGWIN */
1046#endif /* HAVE_LOGIN_CAP */
Damien Millerb38eff82000-04-01 11:09:21 +10001047
1048 snprintf(buf, sizeof buf, "%.200s/%.50s",
1049 _PATH_MAILDIR, pw->pw_name);
1050 child_set_env(&env, &envsize, "MAIL", buf);
1051
1052 /* Normal systems set SHELL by default. */
1053 child_set_env(&env, &envsize, "SHELL", shell);
1054 }
1055 if (getenv("TZ"))
1056 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1057
1058 /* Set custom environment options from RSA authentication. */
Ben Lindstrom38b951c2001-12-06 17:47:47 +00001059 if (!options.use_login) {
1060 while (custom_environment) {
1061 struct envstring *ce = custom_environment;
Ben Lindstrom5a9d0ea2002-07-04 00:12:53 +00001062 char *str = ce->s;
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001063
Ben Lindstrom5a9d0ea2002-07-04 00:12:53 +00001064 for (i = 0; str[i] != '=' && str[i]; i++)
Ben Lindstrom38b951c2001-12-06 17:47:47 +00001065 ;
Ben Lindstrom5a9d0ea2002-07-04 00:12:53 +00001066 if (str[i] == '=') {
1067 str[i] = 0;
1068 child_set_env(&env, &envsize, str, str + i + 1);
Ben Lindstrom38b951c2001-12-06 17:47:47 +00001069 }
1070 custom_environment = ce->next;
1071 xfree(ce->s);
1072 xfree(ce);
Damien Millerb38eff82000-04-01 11:09:21 +10001073 }
Damien Millerb38eff82000-04-01 11:09:21 +10001074 }
1075
Damien Millerf37e2462002-09-19 11:47:55 +10001076 /* SSH_CLIENT deprecated */
Damien Millerb38eff82000-04-01 11:09:21 +10001077 snprintf(buf, sizeof buf, "%.50s %d %d",
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001078 get_remote_ipaddr(), get_remote_port(), get_local_port());
Damien Millerb38eff82000-04-01 11:09:21 +10001079 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1080
Damien Miller00111382003-03-10 11:21:17 +11001081 laddr = get_local_ipaddr(packet_get_connection_in());
Damien Millerf37e2462002-09-19 11:47:55 +10001082 snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
Damien Miller00111382003-03-10 11:21:17 +11001083 get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
1084 xfree(laddr);
Damien Millerf37e2462002-09-19 11:47:55 +10001085 child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1086
Ben Lindstrom86fe8682001-03-17 00:32:57 +00001087 if (s->ttyfd != -1)
1088 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1089 if (s->term)
1090 child_set_env(&env, &envsize, "TERM", s->term);
1091 if (s->display)
1092 child_set_env(&env, &envsize, "DISPLAY", s->display);
Damien Miller7b28dc52000-09-05 13:34:53 +11001093 if (original_command)
1094 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1095 original_command);
Damien Millerb38eff82000-04-01 11:09:21 +10001096
Tim Rice81ed5182002-09-25 17:38:46 -07001097#ifdef _UNICOS
1098 if (cray_tmpdir[0] != '\0')
1099 child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir);
1100#endif /* _UNICOS */
1101
Darren Tucker9dc6c7d2005-02-02 18:30:33 +11001102 /*
1103 * Since we clear KRB5CCNAME at startup, if it's set now then it
1104 * must have been set by a native authentication method (eg AIX or
1105 * SIA), so copy it to the child.
1106 */
1107 {
1108 char *cp;
1109
1110 if ((cp = getenv("KRB5CCNAME")) != NULL)
1111 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1112 }
1113
Damien Millerb38eff82000-04-01 11:09:21 +10001114#ifdef _AIX
Ben Lindstrom839ac4f2002-02-24 20:42:46 +00001115 {
1116 char *cp;
1117
1118 if ((cp = getenv("AUTHSTATE")) != NULL)
1119 child_set_env(&env, &envsize, "AUTHSTATE", cp);
Ben Lindstrom839ac4f2002-02-24 20:42:46 +00001120 read_environment_file(&env, &envsize, "/etc/environment");
1121 }
Damien Millerb38eff82000-04-01 11:09:21 +10001122#endif
Ben Lindstromec95ed92001-07-04 04:21:14 +00001123#ifdef KRB5
Damien Miller9c870f92004-04-16 22:47:55 +10001124 if (s->authctxt->krb5_ccname)
Ben Lindstromec95ed92001-07-04 04:21:14 +00001125 child_set_env(&env, &envsize, "KRB5CCNAME",
Damien Miller9c870f92004-04-16 22:47:55 +10001126 s->authctxt->krb5_ccname);
Ben Lindstromec95ed92001-07-04 04:21:14 +00001127#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001128#ifdef USE_PAM
Kevin Steves38b050a2002-07-23 00:44:07 +00001129 /*
1130 * Pull in any environment variables that may have
1131 * been set by PAM.
1132 */
Damien Miller4e448a32003-05-14 15:11:48 +10001133 if (options.use_pam) {
Damien Millerc756e9b2003-11-17 21:41:42 +11001134 char **p;
Damien Miller787b2ec2003-11-21 23:56:47 +11001135
Damien Millerc756e9b2003-11-17 21:41:42 +11001136 p = fetch_pam_child_environment();
1137 copy_environment(p, &env, &envsize);
1138 free_pam_environment(p);
Kevin Steves38b050a2002-07-23 00:44:07 +00001139
Damien Millerc756e9b2003-11-17 21:41:42 +11001140 p = fetch_pam_environment();
Kevin Steves38b050a2002-07-23 00:44:07 +00001141 copy_environment(p, &env, &envsize);
1142 free_pam_environment(p);
1143 }
Damien Millerb38eff82000-04-01 11:09:21 +10001144#endif /* USE_PAM */
1145
Ben Lindstrom8bb6f362002-06-11 15:59:02 +00001146 if (auth_sock_name != NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001147 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
Ben Lindstrom8bb6f362002-06-11 15:59:02 +00001148 auth_sock_name);
Damien Millerb38eff82000-04-01 11:09:21 +10001149
1150 /* read $HOME/.ssh/environment. */
Ben Lindstrom5d860f02002-08-01 01:28:38 +00001151 if (options.permit_user_env && !options.use_login) {
Damien Millerb1715dc2000-05-30 13:44:51 +10001152 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
Damien Millere9994cb2002-09-10 21:43:53 +10001153 strcmp(pw->pw_dir, "/") ? pw->pw_dir : "");
Damien Millerb38eff82000-04-01 11:09:21 +10001154 read_environment_file(&env, &envsize, buf);
1155 }
1156 if (debug_flag) {
1157 /* dump the environment */
1158 fprintf(stderr, "Environment:\n");
1159 for (i = 0; env[i]; i++)
1160 fprintf(stderr, " %.200s\n", env[i]);
1161 }
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001162 return env;
1163}
1164
1165/*
1166 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1167 * first in this order).
1168 */
1169static void
1170do_rc_files(Session *s, const char *shell)
1171{
1172 FILE *f = NULL;
1173 char cmd[1024];
1174 int do_xauth;
1175 struct stat st;
1176
1177 do_xauth =
1178 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1179
1180 /* ignore _PATH_SSH_USER_RC for subsystems */
1181 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1182 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1183 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1184 if (debug_flag)
1185 fprintf(stderr, "Running %s\n", cmd);
1186 f = popen(cmd, "w");
1187 if (f) {
1188 if (do_xauth)
1189 fprintf(f, "%s %s\n", s->auth_proto,
1190 s->auth_data);
1191 pclose(f);
1192 } else
1193 fprintf(stderr, "Could not run %s\n",
1194 _PATH_SSH_USER_RC);
1195 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1196 if (debug_flag)
1197 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1198 _PATH_SSH_SYSTEM_RC);
1199 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1200 if (f) {
1201 if (do_xauth)
1202 fprintf(f, "%s %s\n", s->auth_proto,
1203 s->auth_data);
1204 pclose(f);
1205 } else
1206 fprintf(stderr, "Could not run %s\n",
1207 _PATH_SSH_SYSTEM_RC);
1208 } else if (do_xauth && options.xauth_location != NULL) {
1209 /* Add authority data to .Xauthority if appropriate. */
1210 if (debug_flag) {
1211 fprintf(stderr,
Ben Lindstrom611797e2002-12-23 02:15:57 +00001212 "Running %.500s remove %.100s\n",
Darren Tucker3e33cec2003-10-02 16:12:36 +10001213 options.xauth_location, s->auth_display);
Ben Lindstrom611797e2002-12-23 02:15:57 +00001214 fprintf(stderr,
1215 "%.500s add %.100s %.100s %.100s\n",
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001216 options.xauth_location, s->auth_display,
1217 s->auth_proto, s->auth_data);
1218 }
1219 snprintf(cmd, sizeof cmd, "%s -q -",
1220 options.xauth_location);
1221 f = popen(cmd, "w");
1222 if (f) {
Ben Lindstrom611797e2002-12-23 02:15:57 +00001223 fprintf(f, "remove %s\n",
1224 s->auth_display);
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001225 fprintf(f, "add %s %s %s\n",
1226 s->auth_display, s->auth_proto,
1227 s->auth_data);
1228 pclose(f);
1229 } else {
1230 fprintf(stderr, "Could not run %s\n",
1231 cmd);
1232 }
1233 }
1234}
1235
1236static void
1237do_nologin(struct passwd *pw)
1238{
1239 FILE *f = NULL;
1240 char buf[1024];
1241
1242#ifdef HAVE_LOGIN_CAP
1243 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1244 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1245 _PATH_NOLOGIN), "r");
1246#else
1247 if (pw->pw_uid)
1248 f = fopen(_PATH_NOLOGIN, "r");
1249#endif
1250 if (f) {
1251 /* /etc/nologin exists. Print its contents and exit. */
Damien Miller996acd22003-04-09 20:59:48 +10001252 logit("User %.100s not allowed because %s exists",
Damien Millera6eb2b72002-09-19 11:50:48 +10001253 pw->pw_name, _PATH_NOLOGIN);
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001254 while (fgets(buf, sizeof(buf), f))
1255 fputs(buf, stderr);
1256 fclose(f);
Damien Millerf25c18d2003-01-07 17:38:58 +11001257 fflush(NULL);
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001258 exit(254);
1259 }
1260}
1261
1262/* Set login name, uid, gid, and groups. */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001263void
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001264do_setusercontext(struct passwd *pw)
1265{
Damien Miller1a3ccb02003-02-24 13:04:01 +11001266#ifndef HAVE_CYGWIN
1267 if (getuid() == 0 || geteuid() == 0)
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001268#endif /* HAVE_CYGWIN */
Damien Miller1a3ccb02003-02-24 13:04:01 +11001269 {
1270
Ben Lindstromf0bfa832002-06-21 00:01:18 +00001271#ifdef HAVE_SETPCRED
Darren Tucker793e8172003-07-08 21:01:04 +10001272 if (setpcred(pw->pw_name, (char **)NULL) == -1)
1273 fatal("Failed to set process credentials");
Ben Lindstromf0bfa832002-06-21 00:01:18 +00001274#endif /* HAVE_SETPCRED */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001275#ifdef HAVE_LOGIN_CAP
Ben Lindstrom938b8282002-07-15 17:58:34 +00001276# ifdef __bsdi__
Damien Millerf18cd162002-06-26 19:12:59 +10001277 setpgid(0, 0);
Ben Lindstrom938b8282002-07-15 17:58:34 +00001278# endif
Darren Tuckerc97b01a2005-02-16 16:47:37 +11001279#ifdef GSSAPI
1280 if (options.gss_authentication) {
1281 temporarily_use_uid(pw);
1282 ssh_gssapi_storecreds();
1283 restore_uid();
1284 }
1285#endif
Damien Millerd3526362004-01-23 14:16:26 +11001286# ifdef USE_PAM
1287 if (options.use_pam) {
1288 do_pam_session();
1289 do_pam_setcred(0);
1290 }
1291# endif /* USE_PAM */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001292 if (setusercontext(lc, pw, pw->pw_uid,
1293 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1294 perror("unable to set user context");
1295 exit(1);
1296 }
1297#else
1298# if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1299 /* Sets login uid for accounting */
1300 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1301 error("setluid: %s", strerror(errno));
1302# endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1303
1304 if (setlogin(pw->pw_name) < 0)
1305 error("setlogin failed: %s", strerror(errno));
1306 if (setgid(pw->pw_gid) < 0) {
1307 perror("setgid");
1308 exit(1);
1309 }
1310 /* Initialize the group list. */
1311 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1312 perror("initgroups");
1313 exit(1);
1314 }
1315 endgrent();
Darren Tuckerc97b01a2005-02-16 16:47:37 +11001316#ifdef GSSAPI
1317 if (options.gss_authentication) {
1318 temporarily_use_uid(pw);
1319 ssh_gssapi_storecreds();
1320 restore_uid();
1321 }
1322#endif
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001323# ifdef USE_PAM
1324 /*
Damien Millera8e06ce2003-11-21 23:48:55 +11001325 * PAM credentials may take the form of supplementary groups.
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001326 * These will have been wiped by the above initgroups() call.
1327 * Reestablish them here.
1328 */
Damien Miller341c6e62003-09-02 23:18:52 +10001329 if (options.use_pam) {
1330 do_pam_session();
Damien Miller4e448a32003-05-14 15:11:48 +10001331 do_pam_setcred(0);
Damien Miller341c6e62003-09-02 23:18:52 +10001332 }
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001333# endif /* USE_PAM */
1334# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1335 irix_setusercontext(pw);
1336# endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
Ben Lindstromb129be62002-06-25 17:12:26 +00001337# ifdef _AIX
Ben Lindstrom51b24882002-07-04 03:08:40 +00001338 aix_usrinfo(pw);
Ben Lindstromb129be62002-06-25 17:12:26 +00001339# endif /* _AIX */
Tim Rice66fd2172005-08-31 09:59:49 -07001340#if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF)
Tim Rice2291c002005-08-26 13:15:19 -07001341 if (set_id(pw->pw_name) != 0) {
1342 exit(1);
1343 }
Tim Rice66fd2172005-08-31 09:59:49 -07001344#endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001345 /* Permanently switch to the desired uid. */
1346 permanently_set_uid(pw);
1347#endif
1348 }
Damien Miller1a3ccb02003-02-24 13:04:01 +11001349
1350#ifdef HAVE_CYGWIN
1351 if (is_winnt)
1352#endif
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001353 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1354 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
Damien Miller73b42d22006-04-22 21:26:08 +10001355
1356#ifdef WITH_SELINUX
1357 ssh_selinux_setup_exec_context(pw->pw_name);
1358#endif
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001359}
1360
Ben Lindstrom08105192002-03-22 02:50:06 +00001361static void
Darren Tucker23bc8d02004-02-06 16:24:31 +11001362do_pwchange(Session *s)
1363{
Darren Tucker09991742004-07-17 17:05:14 +10001364 fflush(NULL);
Darren Tucker23bc8d02004-02-06 16:24:31 +11001365 fprintf(stderr, "WARNING: Your password has expired.\n");
1366 if (s->ttyfd != -1) {
Darren Tuckerfc959702004-07-17 16:12:08 +10001367 fprintf(stderr,
Darren Tucker23bc8d02004-02-06 16:24:31 +11001368 "You must change your password now and login again!\n");
Darren Tucker33370e02005-02-09 22:17:28 +11001369#ifdef PASSWD_NEEDS_USERNAME
1370 execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name,
1371 (char *)NULL);
1372#else
Darren Tucker23bc8d02004-02-06 16:24:31 +11001373 execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
Darren Tucker33370e02005-02-09 22:17:28 +11001374#endif
Darren Tucker23bc8d02004-02-06 16:24:31 +11001375 perror("passwd");
1376 } else {
1377 fprintf(stderr,
1378 "Password change required but no TTY available.\n");
1379 }
1380 exit(1);
1381}
1382
1383static void
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001384launch_login(struct passwd *pw, const char *hostname)
1385{
1386 /* Launch login(1). */
1387
Ben Lindstrom378a4172002-06-07 14:49:56 +00001388 execl(LOGIN_PROGRAM, "login", "-h", hostname,
Kevin Stevesb4799a32002-03-24 23:19:54 +00001389#ifdef xxxLOGIN_NEEDS_TERM
Ben Lindstrom5a6abda2002-06-09 19:41:48 +00001390 (s->term ? s->term : "unknown"),
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001391#endif /* LOGIN_NEEDS_TERM */
Kevin Steves5feaaef2002-04-23 20:45:55 +00001392#ifdef LOGIN_NO_ENDOPT
1393 "-p", "-f", pw->pw_name, (char *)NULL);
1394#else
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001395 "-p", "-f", "--", pw->pw_name, (char *)NULL);
Kevin Steves5feaaef2002-04-23 20:45:55 +00001396#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001397
1398 /* Login couldn't be executed, die. */
1399
1400 perror("login");
1401 exit(1);
1402}
1403
Darren Tucker23bc8d02004-02-06 16:24:31 +11001404static void
1405child_close_fds(void)
1406{
1407 int i;
1408
1409 if (packet_get_connection_in() == packet_get_connection_out())
1410 close(packet_get_connection_in());
1411 else {
1412 close(packet_get_connection_in());
1413 close(packet_get_connection_out());
1414 }
1415 /*
1416 * Close all descriptors related to channels. They will still remain
1417 * open in the parent.
1418 */
1419 /* XXX better use close-on-exec? -markus */
1420 channel_close_all();
1421
1422 /*
1423 * Close any extra file descriptors. Note that there may still be
1424 * descriptors left by system functions. They will be closed later.
1425 */
1426 endpwent();
1427
1428 /*
Damien Miller788f2122005-11-05 15:14:59 +11001429 * Close any extra open file descriptors so that we don't have them
Darren Tucker23bc8d02004-02-06 16:24:31 +11001430 * hanging around in clients. Note that we want to do this after
1431 * initgroups, because at least on Solaris 2.3 it leaves file
1432 * descriptors open.
1433 */
1434 for (i = 3; i < 64; i++)
1435 close(i);
1436}
1437
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001438/*
1439 * Performs common processing for the child, such as setting up the
1440 * environment, closing extra file descriptors, setting the user and group
1441 * ids, and executing the command or shell.
1442 */
1443void
1444do_child(Session *s, const char *command)
1445{
1446 extern char **environ;
1447 char **env;
1448 char *argv[10];
1449 const char *shell, *shell0, *hostname = NULL;
1450 struct passwd *pw = s->pw;
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001451
1452 /* remove hostkey from the child's memory */
1453 destroy_sensitive_data();
1454
Darren Tucker23bc8d02004-02-06 16:24:31 +11001455 /* Force a password change */
1456 if (s->authctxt->force_pwchange) {
1457 do_setusercontext(pw);
1458 child_close_fds();
1459 do_pwchange(s);
1460 exit(1);
1461 }
1462
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001463 /* login(1) is only called if we execute the login shell */
1464 if (options.use_login && command != NULL)
1465 options.use_login = 0;
1466
Tim Rice81ed5182002-09-25 17:38:46 -07001467#ifdef _UNICOS
1468 cray_setup(pw->pw_uid, pw->pw_name, command);
1469#endif /* _UNICOS */
1470
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001471 /*
1472 * Login(1) does this as well, and it needs uid 0 for the "-h"
1473 * switch, so we let login(1) to this for us.
1474 */
1475 if (!options.use_login) {
1476#ifdef HAVE_OSF_SIA
Ben Lindstromc8c548d2003-03-21 01:18:09 +00001477 session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty);
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001478 if (!check_quietlogin(s, command))
1479 do_motd();
1480#else /* HAVE_OSF_SIA */
Darren Tucker42308a42005-10-30 15:31:55 +11001481 /* When PAM is enabled we rely on it to do the nologin check */
1482 if (!options.use_pam)
1483 do_nologin(pw);
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001484 do_setusercontext(pw);
Darren Tucker0a44d1e2004-07-01 09:48:29 +10001485 /*
1486 * PAM session modules in do_setusercontext may have
1487 * generated messages, so if this in an interactive
1488 * login then display them too.
1489 */
Darren Tuckera2a3ed02004-09-11 23:09:53 +10001490 if (!check_quietlogin(s, command))
Darren Tucker0a44d1e2004-07-01 09:48:29 +10001491 display_loginmsg();
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001492#endif /* HAVE_OSF_SIA */
1493 }
1494
Darren Tucker69687f42004-09-11 22:17:26 +10001495#ifdef USE_PAM
Darren Tucker48554152005-04-21 19:50:55 +10001496 if (options.use_pam && !options.use_login && !is_pam_session_open()) {
1497 debug3("PAM session not opened, exiting");
Darren Tucker69687f42004-09-11 22:17:26 +10001498 display_loginmsg();
1499 exit(254);
1500 }
1501#endif
1502
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001503 /*
1504 * Get the shell from the password data. An empty shell field is
1505 * legal, and means /bin/sh.
1506 */
1507 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
Ben Lindstrom46767602002-12-23 02:26:08 +00001508
1509 /*
1510 * Make sure $SHELL points to the shell from the password file,
1511 * even if shell is overridden from login.conf
1512 */
1513 env = do_setup_env(s, shell);
1514
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001515#ifdef HAVE_LOGIN_CAP
1516 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1517#endif
1518
Damien Millerad833b32000-08-23 10:46:23 +10001519 /* we have to stash the hostname before we close our socket. */
1520 if (options.use_login)
Ben Lindstromf15a3862001-04-05 23:32:17 +00001521 hostname = get_remote_name_or_ip(utmp_len,
Damien Miller3a961dc2003-06-03 10:25:48 +10001522 options.use_dns);
Damien Millerb38eff82000-04-01 11:09:21 +10001523 /*
1524 * Close the connection descriptors; note that this is the child, and
1525 * the server will still have the socket open, and it is important
1526 * that we do not shutdown it. Note that the descriptors cannot be
1527 * closed before building the environment, as we call
1528 * get_remote_ipaddr there.
1529 */
Darren Tucker23bc8d02004-02-06 16:24:31 +11001530 child_close_fds();
Damien Millerb38eff82000-04-01 11:09:21 +10001531
Damien Millerb38eff82000-04-01 11:09:21 +10001532 /*
Damien Miller05eda432002-02-10 18:32:28 +11001533 * Must take new environment into use so that .ssh/rc,
1534 * /etc/ssh/sshrc and xauth are run in the proper environment.
Damien Millerb38eff82000-04-01 11:09:21 +10001535 */
1536 environ = env;
1537
Darren Tucker3c78c5e2004-01-23 22:03:10 +11001538#if defined(KRB5) && defined(USE_AFS)
Darren Tucker22ef5082003-12-31 11:37:34 +11001539 /*
1540 * At this point, we check to see if AFS is active and if we have
1541 * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1542 * if we can (and need to) extend the ticket into an AFS token. If
1543 * we don't do this, we run into potential problems if the user's
1544 * home directory is in AFS and it's not world-readable.
1545 */
1546
1547 if (options.kerberos_get_afs_token && k_hasafs() &&
Damien Miller0dc1bef2005-07-17 17:22:45 +10001548 (s->authctxt->krb5_ctx != NULL)) {
Darren Tucker22ef5082003-12-31 11:37:34 +11001549 char cell[64];
1550
1551 debug("Getting AFS token");
1552
1553 k_setpag();
1554
1555 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1556 krb5_afslog(s->authctxt->krb5_ctx,
1557 s->authctxt->krb5_fwd_ccache, cell, NULL);
1558
1559 krb5_afslog_home(s->authctxt->krb5_ctx,
1560 s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1561 }
1562#endif
1563
Damien Miller788f2122005-11-05 15:14:59 +11001564 /* Change current directory to the user's home directory. */
Damien Miller139d4cd2001-10-10 15:07:44 +10001565 if (chdir(pw->pw_dir) < 0) {
1566 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1567 pw->pw_dir, strerror(errno));
1568#ifdef HAVE_LOGIN_CAP
1569 if (login_getcapbool(lc, "requirehome", 0))
1570 exit(1);
1571#endif
1572 }
1573
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001574 if (!options.use_login)
1575 do_rc_files(s, shell);
Ben Lindstromde71cda2001-03-24 00:43:26 +00001576
1577 /* restore SIGPIPE for child */
1578 signal(SIGPIPE, SIG_DFL);
1579
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001580 if (options.use_login) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001581 launch_login(pw, hostname);
1582 /* NEVERREACHED */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001583 }
1584
1585 /* Get the last component of the shell name. */
1586 if ((shell0 = strrchr(shell, '/')) != NULL)
1587 shell0++;
1588 else
1589 shell0 = shell;
1590
Damien Millerb38eff82000-04-01 11:09:21 +10001591 /*
1592 * If we have no command, execute the shell. In this case, the shell
1593 * name to be passed in argv[0] is preceded by '-' to indicate that
1594 * this is a login shell.
1595 */
1596 if (!command) {
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001597 char argv0[256];
Damien Millerb38eff82000-04-01 11:09:21 +10001598
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001599 /* Start the shell. Set initial character to '-'. */
1600 argv0[0] = '-';
Damien Millerb38eff82000-04-01 11:09:21 +10001601
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001602 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1603 >= sizeof(argv0) - 1) {
1604 errno = EINVAL;
Damien Millerb38eff82000-04-01 11:09:21 +10001605 perror(shell);
1606 exit(1);
Damien Millerb38eff82000-04-01 11:09:21 +10001607 }
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001608
1609 /* Execute the shell. */
1610 argv[0] = argv0;
1611 argv[1] = NULL;
1612 execve(shell, argv, env);
1613
1614 /* Executing the shell failed. */
1615 perror(shell);
1616 exit(1);
Damien Millerb38eff82000-04-01 11:09:21 +10001617 }
1618 /*
1619 * Execute the command using the user's shell. This uses the -c
1620 * option to execute the command.
1621 */
Ben Lindstrom4e97e852002-02-19 21:50:43 +00001622 argv[0] = (char *) shell0;
Damien Millerb38eff82000-04-01 11:09:21 +10001623 argv[1] = "-c";
1624 argv[2] = (char *) command;
1625 argv[3] = NULL;
1626 execve(shell, argv, env);
1627 perror(shell);
1628 exit(1);
1629}
1630
1631Session *
1632session_new(void)
1633{
1634 int i;
1635 static int did_init = 0;
1636 if (!did_init) {
1637 debug("session_new: init");
Damien Miller9f0f5c62001-12-21 14:45:46 +11001638 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001639 sessions[i].used = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001640 }
1641 did_init = 1;
1642 }
Damien Miller9f0f5c62001-12-21 14:45:46 +11001643 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001644 Session *s = &sessions[i];
1645 if (! s->used) {
Ben Lindstrom60294322001-03-26 05:38:25 +00001646 memset(s, 0, sizeof(*s));
Damien Millerb38eff82000-04-01 11:09:21 +10001647 s->chanid = -1;
1648 s->ptyfd = -1;
1649 s->ttyfd = -1;
Damien Millerb38eff82000-04-01 11:09:21 +10001650 s->used = 1;
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00001651 s->self = i;
Damien Miller2b9b0452005-07-17 17:19:24 +10001652 s->x11_chanids = NULL;
Damien Miller15b29522000-10-14 12:33:48 +11001653 debug("session_new: session %d", i);
Damien Millerb38eff82000-04-01 11:09:21 +10001654 return s;
1655 }
1656 }
1657 return NULL;
1658}
1659
Ben Lindstrombba81212001-06-25 05:01:22 +00001660static void
Damien Millerb38eff82000-04-01 11:09:21 +10001661session_dump(void)
1662{
1663 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001664 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001665 Session *s = &sessions[i];
Ben Lindstromce0f6342002-06-11 16:42:49 +00001666 debug("dump: used %d session %d %p channel %d pid %ld",
Damien Millerb38eff82000-04-01 11:09:21 +10001667 s->used,
1668 s->self,
1669 s,
1670 s->chanid,
Ben Lindstromce0f6342002-06-11 16:42:49 +00001671 (long)s->pid);
Damien Millerb38eff82000-04-01 11:09:21 +10001672 }
1673}
1674
Damien Millerefb4afe2000-04-12 18:45:05 +10001675int
Ben Lindstrombddd5512001-07-04 04:53:53 +00001676session_open(Authctxt *authctxt, int chanid)
Damien Millerefb4afe2000-04-12 18:45:05 +10001677{
1678 Session *s = session_new();
1679 debug("session_open: channel %d", chanid);
1680 if (s == NULL) {
1681 error("no more sessions");
1682 return 0;
1683 }
Ben Lindstrombddd5512001-07-04 04:53:53 +00001684 s->authctxt = authctxt;
1685 s->pw = authctxt->pw;
Damien Miller3e3b5142003-11-17 21:13:40 +11001686 if (s->pw == NULL || !authctxt->valid)
Kevin Steves43cdef32001-02-11 14:12:08 +00001687 fatal("no user for session %d", s->self);
Damien Millerbd483e72000-04-30 10:00:53 +10001688 debug("session_open: session %d: link with channel %d", s->self, chanid);
1689 s->chanid = chanid;
Damien Millerefb4afe2000-04-12 18:45:05 +10001690 return 1;
1691}
1692
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001693Session *
1694session_by_tty(char *tty)
1695{
1696 int i;
1697 for (i = 0; i < MAX_SESSIONS; i++) {
1698 Session *s = &sessions[i];
1699 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1700 debug("session_by_tty: session %d tty %s", i, tty);
1701 return s;
1702 }
1703 }
1704 debug("session_by_tty: unknown tty %.100s", tty);
1705 session_dump();
1706 return NULL;
1707}
1708
Ben Lindstrombba81212001-06-25 05:01:22 +00001709static Session *
Damien Millerefb4afe2000-04-12 18:45:05 +10001710session_by_channel(int id)
1711{
1712 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001713 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerefb4afe2000-04-12 18:45:05 +10001714 Session *s = &sessions[i];
1715 if (s->used && s->chanid == id) {
1716 debug("session_by_channel: session %d channel %d", i, id);
1717 return s;
1718 }
1719 }
1720 debug("session_by_channel: unknown channel %d", id);
1721 session_dump();
1722 return NULL;
1723}
1724
Ben Lindstrombba81212001-06-25 05:01:22 +00001725static Session *
Damien Miller2b9b0452005-07-17 17:19:24 +10001726session_by_x11_channel(int id)
1727{
1728 int i, j;
1729
1730 for (i = 0; i < MAX_SESSIONS; i++) {
1731 Session *s = &sessions[i];
1732
1733 if (s->x11_chanids == NULL || !s->used)
1734 continue;
1735 for (j = 0; s->x11_chanids[j] != -1; j++) {
1736 if (s->x11_chanids[j] == id) {
1737 debug("session_by_x11_channel: session %d "
1738 "channel %d", s->self, id);
1739 return s;
1740 }
1741 }
1742 }
1743 debug("session_by_x11_channel: unknown channel %d", id);
1744 session_dump();
1745 return NULL;
1746}
1747
1748static Session *
Damien Millerefb4afe2000-04-12 18:45:05 +10001749session_by_pid(pid_t pid)
1750{
1751 int i;
Ben Lindstromce0f6342002-06-11 16:42:49 +00001752 debug("session_by_pid: pid %ld", (long)pid);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001753 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millerefb4afe2000-04-12 18:45:05 +10001754 Session *s = &sessions[i];
1755 if (s->used && s->pid == pid)
1756 return s;
1757 }
Ben Lindstromce0f6342002-06-11 16:42:49 +00001758 error("session_by_pid: unknown pid %ld", (long)pid);
Damien Millerefb4afe2000-04-12 18:45:05 +10001759 session_dump();
1760 return NULL;
1761}
1762
Ben Lindstrombba81212001-06-25 05:01:22 +00001763static int
Damien Millerefb4afe2000-04-12 18:45:05 +10001764session_window_change_req(Session *s)
1765{
1766 s->col = packet_get_int();
1767 s->row = packet_get_int();
1768 s->xpixel = packet_get_int();
1769 s->ypixel = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001770 packet_check_eom();
Damien Millerefb4afe2000-04-12 18:45:05 +10001771 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1772 return 1;
1773}
1774
Ben Lindstrombba81212001-06-25 05:01:22 +00001775static int
Damien Millerefb4afe2000-04-12 18:45:05 +10001776session_pty_req(Session *s)
1777{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001778 u_int len;
Ben Lindstromae8e2d32001-04-14 23:13:02 +00001779 int n_bytes;
Ben Lindstrom6328ab32002-03-22 02:54:23 +00001780
Ben Lindstrom49c12602001-06-13 04:37:36 +00001781 if (no_pty_flag) {
1782 debug("Allocating a pty not permitted for this authentication.");
Damien Millerf6d9e222000-06-18 14:50:44 +10001783 return 0;
Ben Lindstrom49c12602001-06-13 04:37:36 +00001784 }
1785 if (s->ttyfd != -1) {
1786 packet_disconnect("Protocol error: you already have a pty.");
Damien Miller4af51302000-04-16 11:18:38 +10001787 return 0;
Ben Lindstrom49c12602001-06-13 04:37:36 +00001788 }
1789
Damien Millerefb4afe2000-04-12 18:45:05 +10001790 s->term = packet_get_string(&len);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001791
1792 if (compat20) {
1793 s->col = packet_get_int();
1794 s->row = packet_get_int();
1795 } else {
1796 s->row = packet_get_int();
1797 s->col = packet_get_int();
1798 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001799 s->xpixel = packet_get_int();
1800 s->ypixel = packet_get_int();
1801
1802 if (strcmp(s->term, "") == 0) {
1803 xfree(s->term);
1804 s->term = NULL;
1805 }
Ben Lindstrom49c12602001-06-13 04:37:36 +00001806
Damien Millerefb4afe2000-04-12 18:45:05 +10001807 /* Allocate a pty and open it. */
Ben Lindstrom49c12602001-06-13 04:37:36 +00001808 debug("Allocating pty.");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001809 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
Ben Lindstrom49c12602001-06-13 04:37:36 +00001810 if (s->term)
1811 xfree(s->term);
Damien Millerefb4afe2000-04-12 18:45:05 +10001812 s->term = NULL;
1813 s->ptyfd = -1;
1814 s->ttyfd = -1;
1815 error("session_pty_req: session %d alloc failed", s->self);
Damien Miller4af51302000-04-16 11:18:38 +10001816 return 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001817 }
1818 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001819
1820 /* for SSH1 the tty modes length is not given */
1821 if (!compat20)
1822 n_bytes = packet_remaining();
1823 tty_parse_modes(s->ttyfd, &n_bytes);
1824
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001825 if (!use_privsep)
1826 pty_setowner(s->pw, s->tty);
Ben Lindstrom49c12602001-06-13 04:37:36 +00001827
1828 /* Set window size from the packet. */
Damien Millerefb4afe2000-04-12 18:45:05 +10001829 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1830
Damien Miller48b03fc2002-01-22 23:11:40 +11001831 packet_check_eom();
Damien Millere247cc42000-05-07 12:03:14 +10001832 session_proctitle(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10001833 return 1;
1834}
1835
Ben Lindstrombba81212001-06-25 05:01:22 +00001836static int
Damien Millerbd483e72000-04-30 10:00:53 +10001837session_subsystem_req(Session *s)
1838{
Damien Millerae452462001-10-10 15:08:06 +10001839 struct stat st;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001840 u_int len;
Damien Millerbd483e72000-04-30 10:00:53 +10001841 int success = 0;
Damien Millerae452462001-10-10 15:08:06 +10001842 char *cmd, *subsys = packet_get_string(&len);
Damien Millereccb9de2005-06-17 12:59:34 +10001843 u_int i;
Damien Millerbd483e72000-04-30 10:00:53 +10001844
Damien Miller48b03fc2002-01-22 23:11:40 +11001845 packet_check_eom();
Damien Miller996acd22003-04-09 20:59:48 +10001846 logit("subsystem request for %.100s", subsys);
Damien Millerbd483e72000-04-30 10:00:53 +10001847
Damien Millerf6d9e222000-06-18 14:50:44 +10001848 for (i = 0; i < options.num_subsystems; i++) {
Damien Millerae452462001-10-10 15:08:06 +10001849 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1850 cmd = options.subsystem_command[i];
1851 if (stat(cmd, &st) < 0) {
1852 error("subsystem: cannot stat %s: %s", cmd,
1853 strerror(errno));
1854 break;
1855 }
1856 debug("subsystem: exec() %s", cmd);
Ben Lindstromfc9b07d2001-03-22 01:27:23 +00001857 s->is_subsystem = 1;
Damien Millerae452462001-10-10 15:08:06 +10001858 do_exec(s, cmd);
Damien Millerf6d9e222000-06-18 14:50:44 +10001859 success = 1;
Damien Miller5fab4b92002-02-05 12:15:07 +11001860 break;
Damien Millerf6d9e222000-06-18 14:50:44 +10001861 }
1862 }
1863
1864 if (!success)
Damien Miller996acd22003-04-09 20:59:48 +10001865 logit("subsystem request for %.100s failed, subsystem not found",
Damien Millerae452462001-10-10 15:08:06 +10001866 subsys);
Damien Millerf6d9e222000-06-18 14:50:44 +10001867
Damien Millerbd483e72000-04-30 10:00:53 +10001868 xfree(subsys);
1869 return success;
1870}
1871
Ben Lindstrombba81212001-06-25 05:01:22 +00001872static int
Damien Millerbd483e72000-04-30 10:00:53 +10001873session_x11_req(Session *s)
1874{
Ben Lindstrom768176b2001-06-09 01:29:12 +00001875 int success;
Damien Millerbd483e72000-04-30 10:00:53 +10001876
Damien Miller2b9b0452005-07-17 17:19:24 +10001877 if (s->auth_proto != NULL || s->auth_data != NULL) {
1878 error("session_x11_req: session %d: "
Darren Tucker63551872005-12-20 16:14:15 +11001879 "x11 forwarding already active", s->self);
Damien Miller2b9b0452005-07-17 17:19:24 +10001880 return 0;
1881 }
Damien Millerbd483e72000-04-30 10:00:53 +10001882 s->single_connection = packet_get_char();
1883 s->auth_proto = packet_get_string(NULL);
1884 s->auth_data = packet_get_string(NULL);
1885 s->screen = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001886 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10001887
Ben Lindstrom768176b2001-06-09 01:29:12 +00001888 success = session_setup_x11fwd(s);
1889 if (!success) {
Damien Millerbd483e72000-04-30 10:00:53 +10001890 xfree(s->auth_proto);
1891 xfree(s->auth_data);
Ben Lindstrom88259fb2001-06-12 00:21:34 +00001892 s->auth_proto = NULL;
1893 s->auth_data = NULL;
Damien Millerbd483e72000-04-30 10:00:53 +10001894 }
Ben Lindstrom768176b2001-06-09 01:29:12 +00001895 return success;
Damien Millerbd483e72000-04-30 10:00:53 +10001896}
1897
Ben Lindstrombba81212001-06-25 05:01:22 +00001898static int
Damien Millerf6d9e222000-06-18 14:50:44 +10001899session_shell_req(Session *s)
1900{
Damien Miller48b03fc2002-01-22 23:11:40 +11001901 packet_check_eom();
Ben Lindstromc85ab8a2001-06-21 03:13:10 +00001902 do_exec(s, NULL);
Damien Millerf6d9e222000-06-18 14:50:44 +10001903 return 1;
1904}
1905
Ben Lindstrombba81212001-06-25 05:01:22 +00001906static int
Damien Millerf6d9e222000-06-18 14:50:44 +10001907session_exec_req(Session *s)
1908{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001909 u_int len;
Damien Millerf6d9e222000-06-18 14:50:44 +10001910 char *command = packet_get_string(&len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001911 packet_check_eom();
Ben Lindstromc85ab8a2001-06-21 03:13:10 +00001912 do_exec(s, command);
Ben Lindstrom0a7ca6c2001-06-21 03:17:42 +00001913 xfree(command);
Damien Millerf6d9e222000-06-18 14:50:44 +10001914 return 1;
1915}
1916
Ben Lindstrombba81212001-06-25 05:01:22 +00001917static int
Damien Miller54c45982003-05-15 10:20:13 +10001918session_break_req(Session *s)
1919{
Damien Miller54c45982003-05-15 10:20:13 +10001920
Darren Tucker1f8311c2004-05-13 16:39:33 +10001921 packet_get_int(); /* ignored */
Damien Miller54c45982003-05-15 10:20:13 +10001922 packet_check_eom();
1923
Darren Tucker3bdbd842003-08-13 20:31:05 +10001924 if (s->ttyfd == -1 ||
1925 tcsendbreak(s->ttyfd, 0) < 0)
Damien Miller54c45982003-05-15 10:20:13 +10001926 return 0;
Damien Miller54c45982003-05-15 10:20:13 +10001927 return 1;
1928}
1929
1930static int
Darren Tucker46bc0752004-05-02 22:11:30 +10001931session_env_req(Session *s)
1932{
1933 char *name, *val;
1934 u_int name_len, val_len, i;
1935
1936 name = packet_get_string(&name_len);
1937 val = packet_get_string(&val_len);
1938 packet_check_eom();
1939
1940 /* Don't set too many environment variables */
1941 if (s->num_env > 128) {
1942 debug2("Ignoring env request %s: too many env vars", name);
1943 goto fail;
1944 }
1945
1946 for (i = 0; i < options.num_accept_env; i++) {
1947 if (match_pattern(name, options.accept_env[i])) {
1948 debug2("Setting env %d: %s=%s", s->num_env, name, val);
Damien Miller36812092006-03-26 14:22:47 +11001949 s->env = xrealloc(s->env, s->num_env + 1,
1950 sizeof(*s->env));
Darren Tucker46bc0752004-05-02 22:11:30 +10001951 s->env[s->num_env].name = name;
1952 s->env[s->num_env].val = val;
1953 s->num_env++;
1954 return (1);
1955 }
1956 }
1957 debug2("Ignoring env request %s: disallowed name", name);
1958
1959 fail:
1960 xfree(name);
1961 xfree(val);
1962 return (0);
1963}
1964
1965static int
Damien Miller0bc1bd82000-11-13 22:57:25 +11001966session_auth_agent_req(Session *s)
1967{
1968 static int called = 0;
Damien Miller48b03fc2002-01-22 23:11:40 +11001969 packet_check_eom();
Ben Lindstrom14920292000-11-21 21:24:55 +00001970 if (no_agent_forwarding_flag) {
1971 debug("session_auth_agent_req: no_agent_forwarding_flag");
1972 return 0;
1973 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001974 if (called) {
1975 return 0;
1976 } else {
1977 called = 1;
1978 return auth_input_request_forwarding(s->pw);
1979 }
1980}
1981
Damien Millerc7ef63d2002-02-05 12:21:42 +11001982int
1983session_input_channel_req(Channel *c, const char *rtype)
Damien Millerefb4afe2000-04-12 18:45:05 +10001984{
Damien Millerefb4afe2000-04-12 18:45:05 +10001985 int success = 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10001986 Session *s;
Damien Millerefb4afe2000-04-12 18:45:05 +10001987
Damien Millerc7ef63d2002-02-05 12:21:42 +11001988 if ((s = session_by_channel(c->self)) == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +10001989 logit("session_input_channel_req: no session %d req %.100s",
Damien Millerc7ef63d2002-02-05 12:21:42 +11001990 c->self, rtype);
1991 return 0;
1992 }
1993 debug("session_input_channel_req: session %d req %s", s->self, rtype);
Damien Millerefb4afe2000-04-12 18:45:05 +10001994
1995 /*
Ben Lindstromfc9b07d2001-03-22 01:27:23 +00001996 * a session is in LARVAL state until a shell, a command
1997 * or a subsystem is executed
Damien Millerefb4afe2000-04-12 18:45:05 +10001998 */
1999 if (c->type == SSH_CHANNEL_LARVAL) {
2000 if (strcmp(rtype, "shell") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10002001 success = session_shell_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10002002 } else if (strcmp(rtype, "exec") == 0) {
Damien Millerf6d9e222000-06-18 14:50:44 +10002003 success = session_exec_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10002004 } else if (strcmp(rtype, "pty-req") == 0) {
Damien Miller5f056372000-04-16 12:31:48 +10002005 success = session_pty_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10002006 } else if (strcmp(rtype, "x11-req") == 0) {
2007 success = session_x11_req(s);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002008 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
2009 success = session_auth_agent_req(s);
Damien Millerbd483e72000-04-30 10:00:53 +10002010 } else if (strcmp(rtype, "subsystem") == 0) {
2011 success = session_subsystem_req(s);
Darren Tucker46bc0752004-05-02 22:11:30 +10002012 } else if (strcmp(rtype, "env") == 0) {
2013 success = session_env_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10002014 }
2015 }
2016 if (strcmp(rtype, "window-change") == 0) {
2017 success = session_window_change_req(s);
Damien Millera6b1d162004-06-30 22:41:07 +10002018 } else if (strcmp(rtype, "break") == 0) {
2019 success = session_break_req(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10002020 }
Damien Millera6b1d162004-06-30 22:41:07 +10002021
Damien Millerc7ef63d2002-02-05 12:21:42 +11002022 return success;
Damien Millerefb4afe2000-04-12 18:45:05 +10002023}
2024
2025void
2026session_set_fds(Session *s, int fdin, int fdout, int fderr)
2027{
2028 if (!compat20)
2029 fatal("session_set_fds: called for proto != 2.0");
2030 /*
2031 * now that have a child and a pipe to the child,
2032 * we can activate our channel and register the fd's
2033 */
2034 if (s->chanid == -1)
2035 fatal("no channel for session %d", s->self);
2036 channel_set_fds(s->chanid,
2037 fdout, fdin, fderr,
Damien Miller69b69aa2000-10-28 14:19:58 +11002038 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
Damien Miller19a59452002-02-19 15:20:57 +11002039 1,
2040 CHAN_SES_WINDOW_DEFAULT);
Damien Millerefb4afe2000-04-12 18:45:05 +10002041}
2042
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00002043/*
2044 * Function to perform pty cleanup. Also called if we get aborted abnormally
2045 * (e.g., due to a dropped connection).
2046 */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002047void
Darren Tucker3e33cec2003-10-02 16:12:36 +10002048session_pty_cleanup2(Session *s)
Damien Millerb38eff82000-04-01 11:09:21 +10002049{
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00002050 if (s == NULL) {
2051 error("session_pty_cleanup: no session");
2052 return;
2053 }
2054 if (s->ttyfd == -1)
Damien Millerb38eff82000-04-01 11:09:21 +10002055 return;
2056
Kevin Steves43cdef32001-02-11 14:12:08 +00002057 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
Damien Millerb38eff82000-04-01 11:09:21 +10002058
Damien Millerb38eff82000-04-01 11:09:21 +10002059 /* Record that the user has logged out. */
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00002060 if (s->pid != 0)
Tim Ricee06ae4a2002-02-24 17:56:46 -08002061 record_logout(s->pid, s->tty, s->pw->pw_name);
Damien Millerb38eff82000-04-01 11:09:21 +10002062
2063 /* Release the pseudo-tty. */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002064 if (getuid() == 0)
2065 pty_release(s->tty);
Damien Millerb38eff82000-04-01 11:09:21 +10002066
2067 /*
2068 * Close the server side of the socket pairs. We must do this after
2069 * the pty cleanup, so that another process doesn't get this pty
2070 * while we're still cleaning up.
2071 */
2072 if (close(s->ptymaster) < 0)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002073 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
Damien Miller0585d512001-10-12 11:35:50 +10002074
2075 /* unlink pty from session */
2076 s->ttyfd = -1;
Damien Millerb38eff82000-04-01 11:09:21 +10002077}
Damien Millerefb4afe2000-04-12 18:45:05 +10002078
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002079void
Darren Tucker3e33cec2003-10-02 16:12:36 +10002080session_pty_cleanup(Session *s)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002081{
Darren Tucker3e33cec2003-10-02 16:12:36 +10002082 PRIVSEP(session_pty_cleanup2(s));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002083}
2084
Damien Miller5a80bba2002-09-04 16:39:02 +10002085static char *
2086sig2name(int sig)
2087{
2088#define SSH_SIG(x) if (sig == SIG ## x) return #x
2089 SSH_SIG(ABRT);
2090 SSH_SIG(ALRM);
2091 SSH_SIG(FPE);
2092 SSH_SIG(HUP);
2093 SSH_SIG(ILL);
2094 SSH_SIG(INT);
2095 SSH_SIG(KILL);
2096 SSH_SIG(PIPE);
2097 SSH_SIG(QUIT);
2098 SSH_SIG(SEGV);
2099 SSH_SIG(TERM);
2100 SSH_SIG(USR1);
2101 SSH_SIG(USR2);
2102#undef SSH_SIG
2103 return "SIG@openssh.com";
2104}
2105
Ben Lindstrombba81212001-06-25 05:01:22 +00002106static void
Damien Miller2b9b0452005-07-17 17:19:24 +10002107session_close_x11(int id)
2108{
2109 Channel *c;
2110
Damien Millerd47c62a2005-12-13 19:33:57 +11002111 if ((c = channel_by_id(id)) == NULL) {
Damien Miller2b9b0452005-07-17 17:19:24 +10002112 debug("session_close_x11: x11 channel %d missing", id);
2113 } else {
2114 /* Detach X11 listener */
2115 debug("session_close_x11: detach x11 channel %d", id);
2116 channel_cancel_cleanup(id);
2117 if (c->ostate != CHAN_OUTPUT_CLOSED)
2118 chan_mark_dead(c);
2119 }
2120}
2121
2122static void
2123session_close_single_x11(int id, void *arg)
2124{
2125 Session *s;
2126 u_int i;
2127
2128 debug3("session_close_single_x11: channel %d", id);
2129 channel_cancel_cleanup(id);
2130 if ((s = session_by_x11_channel(id)) == NULL)
2131 fatal("session_close_single_x11: no x11 channel %d", id);
2132 for (i = 0; s->x11_chanids[i] != -1; i++) {
2133 debug("session_close_single_x11: session %d: "
2134 "closing channel %d", s->self, s->x11_chanids[i]);
2135 /*
2136 * The channel "id" is already closing, but make sure we
2137 * close all of its siblings.
2138 */
2139 if (s->x11_chanids[i] != id)
2140 session_close_x11(s->x11_chanids[i]);
2141 }
2142 xfree(s->x11_chanids);
2143 s->x11_chanids = NULL;
2144 if (s->display) {
2145 xfree(s->display);
2146 s->display = NULL;
2147 }
2148 if (s->auth_proto) {
2149 xfree(s->auth_proto);
2150 s->auth_proto = NULL;
2151 }
2152 if (s->auth_data) {
2153 xfree(s->auth_data);
2154 s->auth_data = NULL;
2155 }
2156 if (s->auth_display) {
2157 xfree(s->auth_display);
2158 s->auth_display = NULL;
2159 }
2160}
2161
2162static void
Damien Millerefb4afe2000-04-12 18:45:05 +10002163session_exit_message(Session *s, int status)
2164{
2165 Channel *c;
Damien Millerf3dcf1f2002-02-08 22:06:48 +11002166
2167 if ((c = channel_lookup(s->chanid)) == NULL)
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00002168 fatal("session_exit_message: session %d: no channel %d",
Damien Millerefb4afe2000-04-12 18:45:05 +10002169 s->self, s->chanid);
Ben Lindstromce0f6342002-06-11 16:42:49 +00002170 debug("session_exit_message: session %d channel %d pid %ld",
2171 s->self, s->chanid, (long)s->pid);
Damien Millerefb4afe2000-04-12 18:45:05 +10002172
2173 if (WIFEXITED(status)) {
Damien Millerf3dcf1f2002-02-08 22:06:48 +11002174 channel_request_start(s->chanid, "exit-status", 0);
Damien Millerefb4afe2000-04-12 18:45:05 +10002175 packet_put_int(WEXITSTATUS(status));
2176 packet_send();
2177 } else if (WIFSIGNALED(status)) {
Damien Millerf3dcf1f2002-02-08 22:06:48 +11002178 channel_request_start(s->chanid, "exit-signal", 0);
Damien Miller5a80bba2002-09-04 16:39:02 +10002179 packet_put_cstring(sig2name(WTERMSIG(status)));
Damien Millerf3c6cf12000-05-17 22:08:29 +10002180#ifdef WCOREDUMP
Damien Millerefb4afe2000-04-12 18:45:05 +10002181 packet_put_char(WCOREDUMP(status));
Damien Millerf3c6cf12000-05-17 22:08:29 +10002182#else /* WCOREDUMP */
2183 packet_put_char(0);
2184#endif /* WCOREDUMP */
Damien Millerefb4afe2000-04-12 18:45:05 +10002185 packet_put_cstring("");
2186 packet_put_cstring("");
2187 packet_send();
2188 } else {
2189 /* Some weird exit cause. Just exit. */
2190 packet_disconnect("wait returned status %04x.", status);
2191 }
2192
2193 /* disconnect channel */
2194 debug("session_exit_message: release channel %d", s->chanid);
Damien Miller39eda6e2005-11-05 14:52:50 +11002195
2196 /*
2197 * Adjust cleanup callback attachment to send close messages when
Damien Millerc91e5562006-03-26 13:58:55 +11002198 * the channel gets EOF. The session will be then be closed
Damien Miller39eda6e2005-11-05 14:52:50 +11002199 * by session_close_by_channel when the childs close their fds.
2200 */
2201 channel_register_cleanup(c->self, session_close_by_channel, 1);
2202
Damien Miller166fca82000-04-20 07:42:21 +10002203 /*
2204 * emulate a write failure with 'chan_write_failed', nobody will be
2205 * interested in data we write.
2206 * Note that we must not call 'chan_read_failed', since there could
2207 * be some more data waiting in the pipe.
2208 */
Damien Millerbd483e72000-04-30 10:00:53 +10002209 if (c->ostate != CHAN_OUTPUT_CLOSED)
2210 chan_write_failed(c);
Damien Millerefb4afe2000-04-12 18:45:05 +10002211}
2212
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002213void
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00002214session_close(Session *s)
Damien Millerefb4afe2000-04-12 18:45:05 +10002215{
Damien Millereccb9de2005-06-17 12:59:34 +10002216 u_int i;
Darren Tucker46bc0752004-05-02 22:11:30 +10002217
Ben Lindstromce0f6342002-06-11 16:42:49 +00002218 debug("session_close: session %d pid %ld", s->self, (long)s->pid);
Darren Tucker3e33cec2003-10-02 16:12:36 +10002219 if (s->ttyfd != -1)
Ben Lindstrom7eaf8e42001-06-13 04:35:43 +00002220 session_pty_cleanup(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10002221 if (s->term)
2222 xfree(s->term);
2223 if (s->display)
2224 xfree(s->display);
Damien Miller2b9b0452005-07-17 17:19:24 +10002225 if (s->x11_chanids)
2226 xfree(s->x11_chanids);
Damien Miller512bccb2002-02-05 12:11:02 +11002227 if (s->auth_display)
2228 xfree(s->auth_display);
Damien Millerefb4afe2000-04-12 18:45:05 +10002229 if (s->auth_data)
2230 xfree(s->auth_data);
2231 if (s->auth_proto)
2232 xfree(s->auth_proto);
2233 s->used = 0;
Darren Tucker46bc0752004-05-02 22:11:30 +10002234 for (i = 0; i < s->num_env; i++) {
2235 xfree(s->env[i].name);
2236 xfree(s->env[i].val);
2237 }
2238 if (s->env != NULL)
2239 xfree(s->env);
Damien Millere247cc42000-05-07 12:03:14 +10002240 session_proctitle(s);
Damien Millerefb4afe2000-04-12 18:45:05 +10002241}
2242
2243void
2244session_close_by_pid(pid_t pid, int status)
2245{
2246 Session *s = session_by_pid(pid);
2247 if (s == NULL) {
Ben Lindstromce0f6342002-06-11 16:42:49 +00002248 debug("session_close_by_pid: no session for pid %ld",
2249 (long)pid);
Damien Millerefb4afe2000-04-12 18:45:05 +10002250 return;
2251 }
2252 if (s->chanid != -1)
2253 session_exit_message(s, status);
Damien Miller39eda6e2005-11-05 14:52:50 +11002254 if (s->ttyfd != -1)
2255 session_pty_cleanup(s);
Tim Rice83d2f5f2006-02-07 15:17:44 -08002256 s->pid = 0;
Damien Millerefb4afe2000-04-12 18:45:05 +10002257}
2258
2259/*
2260 * this is called when a channel dies before
2261 * the session 'child' itself dies
2262 */
2263void
2264session_close_by_channel(int id, void *arg)
2265{
2266 Session *s = session_by_channel(id);
Damien Miller39eda6e2005-11-05 14:52:50 +11002267 u_int i;
Damien Miller2b9b0452005-07-17 17:19:24 +10002268
Damien Millerefb4afe2000-04-12 18:45:05 +10002269 if (s == NULL) {
Damien Miller3ec27592001-10-12 11:35:04 +10002270 debug("session_close_by_channel: no session for id %d", id);
Damien Millerefb4afe2000-04-12 18:45:05 +10002271 return;
2272 }
Ben Lindstromce0f6342002-06-11 16:42:49 +00002273 debug("session_close_by_channel: channel %d child %ld",
2274 id, (long)s->pid);
Damien Miller3ec27592001-10-12 11:35:04 +10002275 if (s->pid != 0) {
Damien Miller3ec27592001-10-12 11:35:04 +10002276 debug("session_close_by_channel: channel %d: has child", id);
Damien Miller0585d512001-10-12 11:35:50 +10002277 /*
2278 * delay detach of session, but release pty, since
2279 * the fd's to the child are already closed
2280 */
Darren Tucker3e33cec2003-10-02 16:12:36 +10002281 if (s->ttyfd != -1)
Damien Miller0585d512001-10-12 11:35:50 +10002282 session_pty_cleanup(s);
Damien Miller3ec27592001-10-12 11:35:04 +10002283 return;
2284 }
2285 /* detach by removing callback */
Damien Millerefb4afe2000-04-12 18:45:05 +10002286 channel_cancel_cleanup(s->chanid);
Damien Miller39eda6e2005-11-05 14:52:50 +11002287
2288 /* Close any X11 listeners associated with this session */
2289 if (s->x11_chanids != NULL) {
2290 for (i = 0; s->x11_chanids[i] != -1; i++) {
2291 session_close_x11(s->x11_chanids[i]);
2292 s->x11_chanids[i] = -1;
2293 }
2294 }
2295
Damien Millerefb4afe2000-04-12 18:45:05 +10002296 s->chanid = -1;
Damien Miller52b77be2001-10-10 15:14:37 +10002297 session_close(s);
2298}
2299
2300void
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002301session_destroy_all(void (*closefunc)(Session *))
Damien Miller52b77be2001-10-10 15:14:37 +10002302{
2303 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11002304 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Miller52b77be2001-10-10 15:14:37 +10002305 Session *s = &sessions[i];
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00002306 if (s->used) {
2307 if (closefunc != NULL)
2308 closefunc(s);
2309 else
2310 session_close(s);
2311 }
Damien Miller52b77be2001-10-10 15:14:37 +10002312 }
Damien Millerefb4afe2000-04-12 18:45:05 +10002313}
2314
Ben Lindstrombba81212001-06-25 05:01:22 +00002315static char *
Damien Millere247cc42000-05-07 12:03:14 +10002316session_tty_list(void)
2317{
2318 static char buf[1024];
2319 int i;
Damien Millera8ed44b2003-01-10 09:53:12 +11002320 char *cp;
2321
Damien Millere247cc42000-05-07 12:03:14 +10002322 buf[0] = '\0';
Damien Miller9f0f5c62001-12-21 14:45:46 +11002323 for (i = 0; i < MAX_SESSIONS; i++) {
Damien Millere247cc42000-05-07 12:03:14 +10002324 Session *s = &sessions[i];
2325 if (s->used && s->ttyfd != -1) {
Damien Miller787b2ec2003-11-21 23:56:47 +11002326
Damien Millera8ed44b2003-01-10 09:53:12 +11002327 if (strncmp(s->tty, "/dev/", 5) != 0) {
2328 cp = strrchr(s->tty, '/');
2329 cp = (cp == NULL) ? s->tty : cp + 1;
2330 } else
2331 cp = s->tty + 5;
Damien Miller787b2ec2003-11-21 23:56:47 +11002332
Damien Millere247cc42000-05-07 12:03:14 +10002333 if (buf[0] != '\0')
2334 strlcat(buf, ",", sizeof buf);
Damien Millera8ed44b2003-01-10 09:53:12 +11002335 strlcat(buf, cp, sizeof buf);
Damien Millere247cc42000-05-07 12:03:14 +10002336 }
2337 }
2338 if (buf[0] == '\0')
2339 strlcpy(buf, "notty", sizeof buf);
2340 return buf;
2341}
2342
2343void
2344session_proctitle(Session *s)
2345{
2346 if (s->pw == NULL)
2347 error("no user for session %d", s->self);
2348 else
2349 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2350}
2351
Ben Lindstrom768176b2001-06-09 01:29:12 +00002352int
2353session_setup_x11fwd(Session *s)
2354{
Ben Lindstrom768176b2001-06-09 01:29:12 +00002355 struct stat st;
Kevin Steves366298c2001-12-19 17:58:01 +00002356 char display[512], auth_display[512];
2357 char hostname[MAXHOSTNAMELEN];
Damien Miller2b9b0452005-07-17 17:19:24 +10002358 u_int i;
Ben Lindstrom768176b2001-06-09 01:29:12 +00002359
2360 if (no_x11_forwarding_flag) {
2361 packet_send_debug("X11 forwarding disabled in user configuration file.");
2362 return 0;
2363 }
2364 if (!options.x11_forwarding) {
2365 debug("X11 forwarding disabled in server configuration file.");
2366 return 0;
2367 }
2368 if (!options.xauth_location ||
2369 (stat(options.xauth_location, &st) == -1)) {
2370 packet_send_debug("No xauth program; cannot forward with spoofing.");
2371 return 0;
2372 }
Ben Lindstrom699776e2001-06-21 03:14:49 +00002373 if (options.use_login) {
2374 packet_send_debug("X11 forwarding disabled; "
2375 "not compatible with UseLogin=yes.");
2376 return 0;
2377 }
Ben Lindstrom2bcdf062001-06-13 04:41:41 +00002378 if (s->display != NULL) {
Ben Lindstrom768176b2001-06-09 01:29:12 +00002379 debug("X11 display already set.");
2380 return 0;
2381 }
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002382 if (x11_create_display_inet(options.x11_display_offset,
2383 options.x11_use_localhost, s->single_connection,
Damien Miller2b9b0452005-07-17 17:19:24 +10002384 &s->display_number, &s->x11_chanids) == -1) {
Ben Lindstrom2bcdf062001-06-13 04:41:41 +00002385 debug("x11_create_display_inet failed.");
Ben Lindstrom768176b2001-06-09 01:29:12 +00002386 return 0;
2387 }
Damien Miller2b9b0452005-07-17 17:19:24 +10002388 for (i = 0; s->x11_chanids[i] != -1; i++) {
2389 channel_register_cleanup(s->x11_chanids[i],
Damien Miller39eda6e2005-11-05 14:52:50 +11002390 session_close_single_x11, 0);
Damien Miller2b9b0452005-07-17 17:19:24 +10002391 }
Kevin Steves366298c2001-12-19 17:58:01 +00002392
2393 /* Set up a suitable value for the DISPLAY variable. */
2394 if (gethostname(hostname, sizeof(hostname)) < 0)
2395 fatal("gethostname: %.100s", strerror(errno));
2396 /*
2397 * auth_display must be used as the displayname when the
2398 * authorization entry is added with xauth(1). This will be
2399 * different than the DISPLAY string for localhost displays.
2400 */
Damien Miller95c249f2002-02-05 12:11:34 +11002401 if (options.x11_use_localhost) {
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002402 snprintf(display, sizeof display, "localhost:%u.%u",
Kevin Steves366298c2001-12-19 17:58:01 +00002403 s->display_number, s->screen);
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002404 snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
Damien Miller512bccb2002-02-05 12:11:02 +11002405 s->display_number, s->screen);
Kevin Steves366298c2001-12-19 17:58:01 +00002406 s->display = xstrdup(display);
Damien Miller512bccb2002-02-05 12:11:02 +11002407 s->auth_display = xstrdup(auth_display);
Kevin Steves366298c2001-12-19 17:58:01 +00002408 } else {
2409#ifdef IPADDR_IN_DISPLAY
2410 struct hostent *he;
2411 struct in_addr my_addr;
2412
2413 he = gethostbyname(hostname);
2414 if (he == NULL) {
2415 error("Can't get IP address for X11 DISPLAY.");
2416 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2417 return 0;
2418 }
2419 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002420 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
Kevin Steves366298c2001-12-19 17:58:01 +00002421 s->display_number, s->screen);
2422#else
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002423 snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
Kevin Steves366298c2001-12-19 17:58:01 +00002424 s->display_number, s->screen);
2425#endif
2426 s->display = xstrdup(display);
Damien Miller512bccb2002-02-05 12:11:02 +11002427 s->auth_display = xstrdup(display);
Kevin Steves366298c2001-12-19 17:58:01 +00002428 }
2429
Ben Lindstrom768176b2001-06-09 01:29:12 +00002430 return 1;
2431}
2432
Ben Lindstrombba81212001-06-25 05:01:22 +00002433static void
Ben Lindstromdb65e8f2001-01-19 04:26:52 +00002434do_authenticated2(Authctxt *authctxt)
Damien Millerefb4afe2000-04-12 18:45:05 +10002435{
Ben Lindstrombddd5512001-07-04 04:53:53 +00002436 server_loop2(authctxt);
Darren Tucker3e33cec2003-10-02 16:12:36 +10002437}
2438
2439void
2440do_cleanup(Authctxt *authctxt)
2441{
2442 static int called = 0;
2443
2444 debug("do_cleanup");
2445
2446 /* no cleanup if we're in the child for login shell */
2447 if (is_child)
2448 return;
2449
2450 /* avoid double cleanup */
2451 if (called)
2452 return;
2453 called = 1;
2454
2455 if (authctxt == NULL)
2456 return;
2457#ifdef KRB5
2458 if (options.kerberos_ticket_cleanup &&
2459 authctxt->krb5_ctx)
2460 krb5_cleanup_proc(authctxt);
Darren Tucker0efd1552003-08-26 11:49:55 +10002461#endif
Darren Tucker3e33cec2003-10-02 16:12:36 +10002462
2463#ifdef GSSAPI
2464 if (compat20 && options.gss_cleanup_creds)
2465 ssh_gssapi_cleanup_creds();
2466#endif
2467
Darren Tucker8846a072003-10-07 11:30:15 +10002468#ifdef USE_PAM
2469 if (options.use_pam) {
2470 sshpam_cleanup();
2471 sshpam_thread_cleanup();
2472 }
2473#endif
2474
Darren Tucker3e33cec2003-10-02 16:12:36 +10002475 /* remove agent socket */
2476 auth_sock_cleanup_proc(authctxt->pw);
2477
2478 /*
2479 * Cleanup ptys/utmp only if privsep is disabled,
2480 * or if running in monitor.
2481 */
2482 if (!use_privsep || mm_is_monitor())
2483 session_destroy_all(session_pty_cleanup2);
Damien Millerefb4afe2000-04-12 18:45:05 +10002484}