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e2875d9a | 1 | /* $OpenBSD: session.c,v 1.229 2008/02/20 15:25:26 markus Exp $ */ |
7368a6c8 | 2 | /* |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
bcbf86ec | 5 | * |
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 | * | |
e78a59f5 | 12 | * SSH2 support by Markus Friedl. |
a96070d4 | 13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 14 | * |
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. | |
e78a59f5 | 34 | */ |
7368a6c8 | 35 | |
36 | #include "includes.h" | |
aa2eae64 | 37 | |
38 | #include <sys/types.h> | |
536c14e8 | 39 | #include <sys/param.h> |
4095f623 | 40 | #ifdef HAVE_SYS_STAT_H |
41 | # include <sys/stat.h> | |
42 | #endif | |
5b04a8bf | 43 | #include <sys/socket.h> |
cebb4c24 | 44 | #include <sys/un.h> |
536c14e8 | 45 | #include <sys/wait.h> |
a75f5360 | 46 | |
67514848 | 47 | #include <arpa/inet.h> |
48 | ||
028094f4 | 49 | #include <errno.h> |
16fbe330 | 50 | #include <grp.h> |
b5b88c19 | 51 | #ifdef HAVE_PATHS_H |
a75f5360 | 52 | #include <paths.h> |
b5b88c19 | 53 | #endif |
b1842393 | 54 | #include <pwd.h> |
ada68823 | 55 | #include <signal.h> |
24436b92 | 56 | #include <stdarg.h> |
cf851879 | 57 | #include <stdio.h> |
ffa517a8 | 58 | #include <stdlib.h> |
00146caa | 59 | #include <string.h> |
67514848 | 60 | #include <unistd.h> |
7368a6c8 | 61 | |
31652869 | 62 | #include "xmalloc.h" |
7368a6c8 | 63 | #include "ssh.h" |
42f11eb2 | 64 | #include "ssh1.h" |
65 | #include "ssh2.h" | |
1729c161 | 66 | #include "sshpty.h" |
7368a6c8 | 67 | #include "packet.h" |
68 | #include "buffer.h" | |
61a2c1da | 69 | #include "match.h" |
7368a6c8 | 70 | #include "uidswap.h" |
71 | #include "compat.h" | |
a5efa1bb | 72 | #include "channels.h" |
31652869 | 73 | #include "key.h" |
74 | #include "cipher.h" | |
75 | #ifdef GSSAPI | |
76 | #include "ssh-gss.h" | |
77 | #endif | |
78 | #include "hostfile.h" | |
e78a59f5 | 79 | #include "auth.h" |
38c295d6 | 80 | #include "auth-options.h" |
42f11eb2 | 81 | #include "pathnames.h" |
82 | #include "log.h" | |
83 | #include "servconf.h" | |
1729c161 | 84 | #include "sshlogin.h" |
42f11eb2 | 85 | #include "serverloop.h" |
86 | #include "canohost.h" | |
db49deeb | 87 | #include "misc.h" |
5ca51e19 | 88 | #include "session.h" |
07200973 | 89 | #include "kex.h" |
1853d1ef | 90 | #include "monitor_wrap.h" |
c33ba17e | 91 | #include "sftp.h" |
e78a59f5 | 92 | |
bcfcc5f9 | 93 | #if defined(KRB5) && defined(USE_AFS) |
39dfceeb | 94 | #include <kafs.h> |
95 | #endif | |
96 | ||
7368a6c8 | 97 | /* func */ |
98 | ||
99 | Session *session_new(void); | |
9c328529 | 100 | void session_set_fds(Session *, int, int, int); |
2362db19 | 101 | void session_pty_cleanup(Session *); |
9c328529 | 102 | void session_proctitle(Session *); |
103 | int session_setup_x11fwd(Session *); | |
104 | void do_exec_pty(Session *, const char *); | |
105 | void do_exec_no_pty(Session *, const char *); | |
106 | void do_exec(Session *, const char *); | |
107 | void do_login(Session *, const char *); | |
8a9ac95d | 108 | #ifdef LOGIN_NEEDS_UTMPX |
109 | static void do_pre_login(Session *s); | |
110 | #endif | |
9c328529 | 111 | void do_child(Session *, const char *); |
f2c2fd71 | 112 | void do_motd(void); |
9c328529 | 113 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 114 | |
396c147e | 115 | static void do_authenticated1(Authctxt *); |
116 | static void do_authenticated2(Authctxt *); | |
9c328529 | 117 | |
396c147e | 118 | static int session_pty_req(Session *); |
bb5639fe | 119 | |
7368a6c8 | 120 | /* import */ |
121 | extern ServerOptions options; | |
122 | extern char *__progname; | |
123 | extern int log_stderr; | |
124 | extern int debug_flag; | |
1e3b8b07 | 125 | extern u_int utmp_len; |
089fbbd2 | 126 | extern int startup_pipe; |
e78e738a | 127 | extern void destroy_sensitive_data(void); |
bc7dfc06 | 128 | extern Buffer loginmsg; |
089fbbd2 | 129 | |
b5e300c2 | 130 | /* original command from peer. */ |
c95add71 | 131 | const char *original_command = NULL; |
b5e300c2 | 132 | |
7368a6c8 | 133 | /* data */ |
db49deeb | 134 | #define MAX_SESSIONS 20 |
7368a6c8 | 135 | Session sessions[MAX_SESSIONS]; |
c5d85828 | 136 | |
c33ba17e | 137 | #define SUBSYSTEM_NONE 0 |
138 | #define SUBSYSTEM_EXT 1 | |
139 | #define SUBSYSTEM_INT_SFTP 2 | |
140 | ||
2e73a022 | 141 | #ifdef HAVE_LOGIN_CAP |
1836f69f | 142 | login_cap_t *lc; |
2e73a022 | 143 | #endif |
144 | ||
2362db19 | 145 | static int is_child = 0; |
146 | ||
149cdb60 | 147 | /* Name and directory of socket for authentication agent forwarding. */ |
148 | static char *auth_sock_name = NULL; | |
149 | static char *auth_sock_dir = NULL; | |
150 | ||
151 | /* removes the agent forwarding socket */ | |
152 | ||
153 | static void | |
2362db19 | 154 | auth_sock_cleanup_proc(struct passwd *pw) |
149cdb60 | 155 | { |
149cdb60 | 156 | if (auth_sock_name != NULL) { |
157 | temporarily_use_uid(pw); | |
158 | unlink(auth_sock_name); | |
159 | rmdir(auth_sock_dir); | |
160 | auth_sock_name = NULL; | |
161 | restore_uid(); | |
162 | } | |
163 | } | |
164 | ||
165 | static int | |
166 | auth_input_request_forwarding(struct passwd * pw) | |
167 | { | |
168 | Channel *nc; | |
169 | int sock; | |
170 | struct sockaddr_un sunaddr; | |
171 | ||
172 | if (auth_sock_name != NULL) { | |
173 | error("authentication forwarding requested twice."); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
178 | temporarily_use_uid(pw); | |
179 | ||
180 | /* Allocate a buffer for the socket name, and format the name. */ | |
181 | auth_sock_name = xmalloc(MAXPATHLEN); | |
182 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
c88de854 | 183 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
149cdb60 | 184 | |
185 | /* Create private directory for socket */ | |
186 | if (mkdtemp(auth_sock_dir) == NULL) { | |
187 | packet_send_debug("Agent forwarding disabled: " | |
188 | "mkdtemp() failed: %.100s", strerror(errno)); | |
189 | restore_uid(); | |
190 | xfree(auth_sock_name); | |
191 | xfree(auth_sock_dir); | |
192 | auth_sock_name = NULL; | |
193 | auth_sock_dir = NULL; | |
194 | return 0; | |
195 | } | |
c457707e | 196 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
197 | auth_sock_dir, (long) getpid()); | |
149cdb60 | 198 | |
149cdb60 | 199 | /* Create the socket. */ |
200 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
201 | if (sock < 0) | |
202 | packet_disconnect("socket: %.100s", strerror(errno)); | |
203 | ||
204 | /* Bind it to the name. */ | |
205 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
206 | sunaddr.sun_family = AF_UNIX; | |
207 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
208 | ||
32596c7b | 209 | if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) |
149cdb60 | 210 | packet_disconnect("bind: %.100s", strerror(errno)); |
211 | ||
212 | /* Restore the privileged uid. */ | |
213 | restore_uid(); | |
214 | ||
215 | /* Start listening on the socket. */ | |
fce39749 | 216 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
149cdb60 | 217 | packet_disconnect("listen: %.100s", strerror(errno)); |
218 | ||
219 | /* Allocate a channel for the authentication agent socket. */ | |
220 | nc = channel_new("auth socket", | |
221 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
222 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 223 | 0, "auth socket", 1); |
149cdb60 | 224 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
225 | return 1; | |
226 | } | |
227 | ||
dd1fb864 | 228 | static void |
229 | display_loginmsg(void) | |
230 | { | |
56964485 | 231 | if (buffer_len(&loginmsg) > 0) { |
232 | buffer_append(&loginmsg, "\0", 1); | |
233 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
234 | buffer_clear(&loginmsg); | |
235 | } | |
dd1fb864 | 236 | } |
149cdb60 | 237 | |
bb5639fe | 238 | void |
239 | do_authenticated(Authctxt *authctxt) | |
240 | { | |
381b021b | 241 | setproctitle("%s", authctxt->pw->pw_name); |
242 | ||
bb5639fe | 243 | /* setup the channel layer */ |
244 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
245 | channel_permit_all_opens(); | |
246 | ||
247 | if (compat20) | |
248 | do_authenticated2(authctxt); | |
249 | else | |
250 | do_authenticated1(authctxt); | |
e4f7282d | 251 | |
2362db19 | 252 | do_cleanup(authctxt); |
bb5639fe | 253 | } |
254 | ||
7368a6c8 | 255 | /* |
256 | * Prepares for an interactive session. This is called after the user has | |
257 | * been successfully authenticated. During this message exchange, pseudo | |
258 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
259 | * are requested, etc. | |
260 | */ | |
396c147e | 261 | static void |
bb5639fe | 262 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 263 | { |
264 | Session *s; | |
7368a6c8 | 265 | char *command; |
54a5250f | 266 | int success, type, screen_flag; |
7138ebd9 | 267 | int enable_compression_after_reply = 0; |
268 | u_int proto_len, data_len, dlen, compression_level = 0; | |
7368a6c8 | 269 | |
270 | s = session_new(); | |
b0042027 | 271 | if (s == NULL) { |
272 | error("no more sessions"); | |
273 | return; | |
274 | } | |
ced49be2 | 275 | s->authctxt = authctxt; |
bb5639fe | 276 | s->pw = authctxt->pw; |
2e73a022 | 277 | |
7368a6c8 | 278 | /* |
279 | * We stay in this loop until the client requests to execute a shell | |
280 | * or a command. | |
281 | */ | |
282 | for (;;) { | |
bb5639fe | 283 | success = 0; |
7368a6c8 | 284 | |
285 | /* Get a packet from the client. */ | |
54a5250f | 286 | type = packet_read(); |
7368a6c8 | 287 | |
288 | /* Process the packet. */ | |
289 | switch (type) { | |
290 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 291 | compression_level = packet_get_int(); |
95500969 | 292 | packet_check_eom(); |
7368a6c8 | 293 | if (compression_level < 1 || compression_level > 9) { |
d77347cc | 294 | packet_send_debug("Received invalid compression level %d.", |
184eed6a | 295 | compression_level); |
7368a6c8 | 296 | break; |
297 | } | |
07200973 | 298 | if (options.compression == COMP_NONE) { |
636f76ca | 299 | debug2("compression disabled"); |
300 | break; | |
301 | } | |
7368a6c8 | 302 | /* Enable compression after we have responded with SUCCESS. */ |
303 | enable_compression_after_reply = 1; | |
304 | success = 1; | |
305 | break; | |
306 | ||
307 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 308 | success = session_pty_req(s); |
7368a6c8 | 309 | break; |
310 | ||
311 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 312 | s->auth_proto = packet_get_string(&proto_len); |
313 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 314 | |
2af09193 | 315 | screen_flag = packet_get_protocol_flags() & |
316 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
317 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
318 | ||
319 | if (packet_remaining() == 4) { | |
320 | if (!screen_flag) | |
321 | debug2("Buggy client: " | |
322 | "X11 screen flag missing"); | |
7368a6c8 | 323 | s->screen = packet_get_int(); |
c8b058b4 | 324 | } else { |
7368a6c8 | 325 | s->screen = 0; |
c8b058b4 | 326 | } |
95500969 | 327 | packet_check_eom(); |
8dcd9d5c | 328 | success = session_setup_x11fwd(s); |
329 | if (!success) { | |
330 | xfree(s->auth_proto); | |
331 | xfree(s->auth_data); | |
1500bcdd | 332 | s->auth_proto = NULL; |
333 | s->auth_data = NULL; | |
7368a6c8 | 334 | } |
7368a6c8 | 335 | break; |
7368a6c8 | 336 | |
337 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
338 | if (no_agent_forwarding_flag || compat13) { | |
339 | debug("Authentication agent forwarding not permitted for this authentication."); | |
340 | break; | |
341 | } | |
342 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 343 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 344 | break; |
345 | ||
346 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
347 | if (no_port_forwarding_flag) { | |
348 | debug("Port forwarding not permitted for this authentication."); | |
349 | break; | |
350 | } | |
33de75a3 | 351 | if (!options.allow_tcp_forwarding) { |
352 | debug("Port forwarding not permitted."); | |
353 | break; | |
354 | } | |
7368a6c8 | 355 | debug("Received TCP/IP port forwarding request."); |
42ea6f5e | 356 | if (channel_input_port_forward_request(s->pw->pw_uid == 0, |
357 | options.gateway_ports) < 0) { | |
358 | debug("Port forwarding failed."); | |
359 | break; | |
360 | } | |
7368a6c8 | 361 | success = 1; |
362 | break; | |
363 | ||
364 | case SSH_CMSG_MAX_PACKET_SIZE: | |
365 | if (packet_set_maxsize(packet_get_int()) > 0) | |
366 | success = 1; | |
367 | break; | |
184eed6a | 368 | |
7368a6c8 | 369 | case SSH_CMSG_EXEC_SHELL: |
370 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 371 | if (type == SSH_CMSG_EXEC_CMD) { |
372 | command = packet_get_string(&dlen); | |
373 | debug("Exec command '%.500s'", command); | |
c95add71 | 374 | do_exec(s, command); |
375 | xfree(command); | |
7368a6c8 | 376 | } else { |
c95add71 | 377 | do_exec(s, NULL); |
7368a6c8 | 378 | } |
95500969 | 379 | packet_check_eom(); |
fc2a1d28 | 380 | session_close(s); |
7368a6c8 | 381 | return; |
382 | ||
383 | default: | |
384 | /* | |
385 | * Any unknown messages in this phase are ignored, | |
386 | * and a failure message is returned. | |
387 | */ | |
bbe88b6d | 388 | logit("Unknown packet type received after authentication: %d", type); |
7368a6c8 | 389 | } |
390 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
391 | packet_send(); | |
392 | packet_write_wait(); | |
393 | ||
394 | /* Enable compression now that we have replied if appropriate. */ | |
395 | if (enable_compression_after_reply) { | |
396 | enable_compression_after_reply = 0; | |
397 | packet_start_compression(compression_level); | |
398 | } | |
399 | } | |
400 | } | |
401 | ||
402 | /* | |
403 | * This is called to fork and execute a command when we have no tty. This | |
404 | * will call do_child from the child, and server_loop from the parent after | |
405 | * setting up file descriptors and such. | |
406 | */ | |
6ae2364d | 407 | void |
65068d16 | 408 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 409 | { |
c457707e | 410 | pid_t pid; |
7368a6c8 | 411 | |
412 | #ifdef USE_PIPES | |
413 | int pin[2], pout[2], perr[2]; | |
414 | /* Allocate pipes for communicating with the program. */ | |
415 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
416 | packet_disconnect("Could not create pipes: %.100s", | |
417 | strerror(errno)); | |
418 | #else /* USE_PIPES */ | |
419 | int inout[2], err[2]; | |
420 | /* Uses socket pairs to communicate with the program. */ | |
421 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
422 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
423 | packet_disconnect("Could not create socket pairs: %.100s", | |
424 | strerror(errno)); | |
425 | #endif /* USE_PIPES */ | |
426 | if (s == NULL) | |
427 | fatal("do_exec_no_pty: no session"); | |
428 | ||
1d1ffb87 | 429 | session_proctitle(s); |
7368a6c8 | 430 | |
b19d61d7 | 431 | #if defined(USE_PAM) |
59f327e0 | 432 | if (options.use_pam && !use_privsep) |
7fceb20d | 433 | do_pam_setcred(1); |
266140a8 | 434 | #endif /* USE_PAM */ |
435 | ||
7368a6c8 | 436 | /* Fork the child. */ |
437 | if ((pid = fork()) == 0) { | |
2362db19 | 438 | is_child = 1; |
516f0d7d | 439 | |
7368a6c8 | 440 | /* Child. Reinitialize the log since the pid has changed. */ |
441 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
442 | ||
443 | /* | |
444 | * Create a new session and process group since the 4.4BSD | |
445 | * setlogin() affects the entire process group. | |
446 | */ | |
447 | if (setsid() < 0) | |
448 | error("setsid failed: %.100s", strerror(errno)); | |
449 | ||
450 | #ifdef USE_PIPES | |
451 | /* | |
452 | * Redirect stdin. We close the parent side of the socket | |
453 | * pair, and make the child side the standard input. | |
454 | */ | |
455 | close(pin[1]); | |
456 | if (dup2(pin[0], 0) < 0) | |
457 | perror("dup2 stdin"); | |
458 | close(pin[0]); | |
459 | ||
460 | /* Redirect stdout. */ | |
461 | close(pout[0]); | |
462 | if (dup2(pout[1], 1) < 0) | |
463 | perror("dup2 stdout"); | |
464 | close(pout[1]); | |
465 | ||
466 | /* Redirect stderr. */ | |
467 | close(perr[0]); | |
468 | if (dup2(perr[1], 2) < 0) | |
469 | perror("dup2 stderr"); | |
470 | close(perr[1]); | |
471 | #else /* USE_PIPES */ | |
472 | /* | |
473 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
474 | * use the same socket, as some programs (particularly rdist) | |
475 | * seem to depend on it. | |
476 | */ | |
477 | close(inout[1]); | |
478 | close(err[1]); | |
479 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
480 | perror("dup2 stdin"); | |
481 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
482 | perror("dup2 stdout"); | |
483 | if (dup2(err[0], 2) < 0) /* stderr */ | |
484 | perror("dup2 stderr"); | |
485 | #endif /* USE_PIPES */ | |
486 | ||
ef51930f | 487 | #ifdef _UNICOS |
488 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
489 | #endif | |
490 | ||
3dfce5de | 491 | closefrom(STDERR_FILENO + 1); |
492 | ||
7368a6c8 | 493 | /* Do processing for the child (exec command etc). */ |
56b3e9ce | 494 | do_child(s, command); |
7368a6c8 | 495 | /* NOTREACHED */ |
496 | } | |
ef51930f | 497 | #ifdef _UNICOS |
498 | signal(WJSIGNAL, cray_job_termination_handler); | |
499 | #endif /* _UNICOS */ | |
3c62e7eb | 500 | #ifdef HAVE_CYGWIN |
501 | if (is_winnt) | |
502 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
503 | #endif | |
7368a6c8 | 504 | if (pid < 0) |
505 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
506 | s->pid = pid; | |
b5c334cc | 507 | /* Set interactive/non-interactive mode. */ |
508 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 509 | #ifdef USE_PIPES |
510 | /* We are the parent. Close the child sides of the pipes. */ | |
511 | close(pin[0]); | |
512 | close(pout[1]); | |
513 | close(perr[1]); | |
514 | ||
e78a59f5 | 515 | if (compat20) { |
d7ecbe88 | 516 | if (s->is_subsystem) { |
517 | close(perr[0]); | |
518 | perr[0] = -1; | |
519 | } | |
520 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
e78a59f5 | 521 | } else { |
522 | /* Enter the interactive session. */ | |
523 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 524 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 525 | } |
7368a6c8 | 526 | #else /* USE_PIPES */ |
527 | /* We are the parent. Close the child sides of the socket pairs. */ | |
528 | close(inout[0]); | |
529 | close(err[0]); | |
530 | ||
75dbfa01 | 531 | /* |
532 | * Clear loginmsg, since it's the child's responsibility to display | |
533 | * it to the user, otherwise multiple sessions may accumulate | |
534 | * multiple copies of the login messages. | |
535 | */ | |
536 | buffer_clear(&loginmsg); | |
537 | ||
7368a6c8 | 538 | /* |
539 | * Enter the interactive session. Note: server_loop must be able to | |
540 | * handle the case that fdin and fdout are the same. | |
541 | */ | |
e78a59f5 | 542 | if (compat20) { |
e5d7a405 | 543 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 544 | } else { |
545 | server_loop(pid, inout[1], inout[1], err[1]); | |
546 | /* server_loop has closed inout[1] and err[1]. */ | |
547 | } | |
7368a6c8 | 548 | #endif /* USE_PIPES */ |
549 | } | |
550 | ||
551 | /* | |
552 | * This is called to fork and execute a command when we have a tty. This | |
553 | * will call do_child from the child, and server_loop from the parent after | |
554 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
555 | * lastlog, and other such operations. | |
556 | */ | |
6ae2364d | 557 | void |
65068d16 | 558 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 559 | { |
7368a6c8 | 560 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 561 | pid_t pid; |
7368a6c8 | 562 | |
563 | if (s == NULL) | |
564 | fatal("do_exec_pty: no session"); | |
565 | ptyfd = s->ptyfd; | |
566 | ttyfd = s->ttyfd; | |
567 | ||
b19d61d7 | 568 | #if defined(USE_PAM) |
7fceb20d | 569 | if (options.use_pam) { |
49e82bb9 | 570 | do_pam_set_tty(s->tty); |
72037bc8 | 571 | if (!use_privsep) |
572 | do_pam_setcred(1); | |
7fceb20d | 573 | } |
27cf96de | 574 | #endif |
266140a8 | 575 | |
7368a6c8 | 576 | /* Fork the child. */ |
577 | if ((pid = fork()) == 0) { | |
2362db19 | 578 | is_child = 1; |
57156994 | 579 | |
c345cf9d | 580 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 581 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 582 | /* Close the master side of the pseudo tty. */ |
583 | close(ptyfd); | |
584 | ||
585 | /* Make the pseudo tty our controlling tty. */ | |
586 | pty_make_controlling_tty(&ttyfd, s->tty); | |
587 | ||
05fd093c | 588 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
589 | if (dup2(ttyfd, 0) < 0) | |
590 | error("dup2 stdin: %s", strerror(errno)); | |
591 | if (dup2(ttyfd, 1) < 0) | |
592 | error("dup2 stdout: %s", strerror(errno)); | |
593 | if (dup2(ttyfd, 2) < 0) | |
594 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 595 | |
596 | /* Close the extra descriptor for the pseudo tty. */ | |
597 | close(ttyfd); | |
598 | ||
c345cf9d | 599 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 600 | #ifndef HAVE_OSF_SIA |
ef51930f | 601 | if (!(options.use_login && command == NULL)) { |
602 | #ifdef _UNICOS | |
603 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
604 | #endif /* _UNICOS */ | |
a22aff1f | 605 | do_login(s, command); |
ef51930f | 606 | } |
7e2d5fa4 | 607 | # ifdef LOGIN_NEEDS_UTMPX |
608 | else | |
609 | do_pre_login(s); | |
610 | # endif | |
c96a4aaf | 611 | #endif |
7368a6c8 | 612 | |
3dfce5de | 613 | closefrom(STDERR_FILENO + 1); |
614 | ||
7368a6c8 | 615 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 616 | do_child(s, command); |
7368a6c8 | 617 | /* NOTREACHED */ |
618 | } | |
ef51930f | 619 | #ifdef _UNICOS |
620 | signal(WJSIGNAL, cray_job_termination_handler); | |
621 | #endif /* _UNICOS */ | |
3c62e7eb | 622 | #ifdef HAVE_CYGWIN |
623 | if (is_winnt) | |
624 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
625 | #endif | |
7368a6c8 | 626 | if (pid < 0) |
627 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
628 | s->pid = pid; | |
629 | ||
630 | /* Parent. Close the slave side of the pseudo tty. */ | |
631 | close(ttyfd); | |
632 | ||
633 | /* | |
634 | * Create another descriptor of the pty master side for use as the | |
635 | * standard input. We could use the original descriptor, but this | |
636 | * simplifies code in server_loop. The descriptor is bidirectional. | |
637 | */ | |
638 | fdout = dup(ptyfd); | |
639 | if (fdout < 0) | |
640 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
641 | ||
642 | /* we keep a reference to the pty master */ | |
643 | ptymaster = dup(ptyfd); | |
644 | if (ptymaster < 0) | |
645 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
646 | s->ptymaster = ptymaster; | |
647 | ||
648 | /* Enter interactive session. */ | |
b5c334cc | 649 | packet_set_interactive(1); |
e78a59f5 | 650 | if (compat20) { |
651 | session_set_fds(s, ptyfd, fdout, -1); | |
652 | } else { | |
653 | server_loop(pid, ptyfd, fdout, -1); | |
654 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 655 | } |
7368a6c8 | 656 | } |
657 | ||
7e2d5fa4 | 658 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 659 | static void |
7e2d5fa4 | 660 | do_pre_login(Session *s) |
661 | { | |
662 | socklen_t fromlen; | |
663 | struct sockaddr_storage from; | |
664 | pid_t pid = getpid(); | |
665 | ||
666 | /* | |
667 | * Get IP address of client. If the connection is not a socket, let | |
668 | * the address be 0.0.0.0. | |
669 | */ | |
670 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 671 | fromlen = sizeof(from); |
7e2d5fa4 | 672 | if (packet_connection_is_on_socket()) { |
7e2d5fa4 | 673 | if (getpeername(packet_get_connection_in(), |
32596c7b | 674 | (struct sockaddr *)&from, &fromlen) < 0) { |
7e2d5fa4 | 675 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 676 | cleanup_exit(255); |
7e2d5fa4 | 677 | } |
678 | } | |
679 | ||
680 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
c5a7d788 | 681 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d4ac26ed | 682 | (struct sockaddr *)&from, fromlen); |
7e2d5fa4 | 683 | } |
684 | #endif | |
685 | ||
dac6753b | 686 | /* |
687 | * This is called to fork and execute a command. If another command is | |
688 | * to be forced, execute that instead. | |
689 | */ | |
690 | void | |
691 | do_exec(Session *s, const char *command) | |
692 | { | |
e7259e8d | 693 | if (options.adm_forced_command) { |
694 | original_command = command; | |
695 | command = options.adm_forced_command; | |
db49deeb | 696 | if (strcmp(INTERNAL_SFTP_NAME, command) == 0) |
697 | s->is_subsystem = SUBSYSTEM_INT_SFTP; | |
698 | else if (s->is_subsystem) | |
c33ba17e | 699 | s->is_subsystem = SUBSYSTEM_EXT; |
e7259e8d | 700 | debug("Forced command (config) '%.900s'", command); |
701 | } else if (forced_command) { | |
dac6753b | 702 | original_command = command; |
703 | command = forced_command; | |
db49deeb | 704 | if (strcmp(INTERNAL_SFTP_NAME, command) == 0) |
705 | s->is_subsystem = SUBSYSTEM_INT_SFTP; | |
706 | else if (s->is_subsystem) | |
c33ba17e | 707 | s->is_subsystem = SUBSYSTEM_EXT; |
e7259e8d | 708 | debug("Forced command (key option) '%.900s'", command); |
dac6753b | 709 | } |
710 | ||
6039eeef | 711 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 712 | if (command != NULL) |
713 | PRIVSEP(audit_run_command(command)); | |
714 | else if (s->ttyfd == -1) { | |
715 | char *shell = s->pw->pw_shell; | |
716 | ||
717 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
718 | shell =_PATH_BSHELL; | |
719 | PRIVSEP(audit_run_command(shell)); | |
720 | } | |
721 | #endif | |
dac6753b | 722 | if (s->ttyfd != -1) |
723 | do_exec_pty(s, command); | |
724 | else | |
725 | do_exec_no_pty(s, command); | |
726 | ||
c95add71 | 727 | original_command = NULL; |
dac6753b | 728 | |
be2ca0c9 | 729 | /* |
730 | * Clear loginmsg: it's the child's responsibility to display | |
731 | * it to the user, otherwise multiple sessions may accumulate | |
732 | * multiple copies of the login messages. | |
733 | */ | |
734 | buffer_clear(&loginmsg); | |
735 | } | |
f7342052 | 736 | |
c345cf9d | 737 | /* administrative, login(1)-like work */ |
738 | void | |
a22aff1f | 739 | do_login(Session *s, const char *command) |
c345cf9d | 740 | { |
c345cf9d | 741 | socklen_t fromlen; |
742 | struct sockaddr_storage from; | |
c345cf9d | 743 | struct passwd * pw = s->pw; |
744 | pid_t pid = getpid(); | |
745 | ||
746 | /* | |
747 | * Get IP address of client. If the connection is not a socket, let | |
748 | * the address be 0.0.0.0. | |
749 | */ | |
750 | memset(&from, 0, sizeof(from)); | |
d4ac26ed | 751 | fromlen = sizeof(from); |
c345cf9d | 752 | if (packet_connection_is_on_socket()) { |
c345cf9d | 753 | if (getpeername(packet_get_connection_in(), |
f7342052 | 754 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 755 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 756 | cleanup_exit(255); |
c345cf9d | 757 | } |
758 | } | |
759 | ||
760 | /* Record that there was a login on that tty from the remote host. */ | |
49a34e84 | 761 | if (!use_privsep) |
762 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
763 | get_remote_name_or_ip(utmp_len, | |
c5a7d788 | 764 | options.use_dns), |
ba1566dd | 765 | (struct sockaddr *)&from, fromlen); |
c345cf9d | 766 | |
2919e060 | 767 | #ifdef USE_PAM |
768 | /* | |
769 | * If password change is needed, do it now. | |
770 | * This needs to occur before the ~/.hushlogin check. | |
771 | */ | |
dd1fb864 | 772 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
773 | display_loginmsg(); | |
2919e060 | 774 | do_pam_chauthtok(); |
dd1fb864 | 775 | s->authctxt->force_pwchange = 0; |
5b9e2464 | 776 | /* XXX - signal [net] parent to enable forwardings */ |
2919e060 | 777 | } |
778 | #endif | |
779 | ||
f2c2fd71 | 780 | if (check_quietlogin(s, command)) |
c345cf9d | 781 | return; |
782 | ||
dd1fb864 | 783 | display_loginmsg(); |
c345cf9d | 784 | |
f2c2fd71 | 785 | do_motd(); |
786 | } | |
787 | ||
788 | /* | |
789 | * Display the message of the day. | |
790 | */ | |
791 | void | |
792 | do_motd(void) | |
793 | { | |
794 | FILE *f; | |
795 | char buf[256]; | |
796 | ||
c345cf9d | 797 | if (options.print_motd) { |
2e73a022 | 798 | #ifdef HAVE_LOGIN_CAP |
799 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
800 | "/etc/motd"), "r"); | |
801 | #else | |
c345cf9d | 802 | f = fopen("/etc/motd", "r"); |
2e73a022 | 803 | #endif |
c345cf9d | 804 | if (f) { |
805 | while (fgets(buf, sizeof(buf), f)) | |
806 | fputs(buf, stdout); | |
807 | fclose(f); | |
808 | } | |
809 | } | |
810 | } | |
811 | ||
9c328529 | 812 | |
813 | /* | |
814 | * Check for quiet login, either .hushlogin or command given. | |
815 | */ | |
816 | int | |
817 | check_quietlogin(Session *s, const char *command) | |
818 | { | |
819 | char buf[256]; | |
820 | struct passwd *pw = s->pw; | |
821 | struct stat st; | |
822 | ||
823 | /* Return 1 if .hushlogin exists or a command given. */ | |
824 | if (command != NULL) | |
825 | return 1; | |
826 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
827 | #ifdef HAVE_LOGIN_CAP | |
828 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
829 | return 1; | |
830 | #else | |
831 | if (stat(buf, &st) >= 0) | |
832 | return 1; | |
833 | #endif | |
834 | return 0; | |
835 | } | |
836 | ||
7368a6c8 | 837 | /* |
838 | * Sets the value of the given variable in the environment. If the variable | |
839 | * already exists, its value is overriden. | |
840 | */ | |
7364bd04 | 841 | void |
1e3b8b07 | 842 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
184eed6a | 843 | const char *value) |
7368a6c8 | 844 | { |
7368a6c8 | 845 | char **env; |
c46e584f | 846 | u_int envsize; |
847 | u_int i, namelen; | |
7368a6c8 | 848 | |
95b99395 | 849 | /* |
850 | * If we're passed an uninitialized list, allocate a single null | |
851 | * entry before continuing. | |
852 | */ | |
853 | if (*envp == NULL && *envsizep == 0) { | |
854 | *envp = xmalloc(sizeof(char *)); | |
855 | *envp[0] = NULL; | |
856 | *envsizep = 1; | |
857 | } | |
858 | ||
7368a6c8 | 859 | /* |
860 | * Find the slot where the value should be stored. If the variable | |
861 | * already exists, we reuse the slot; otherwise we append a new slot | |
862 | * at the end of the array, expanding if necessary. | |
863 | */ | |
864 | env = *envp; | |
865 | namelen = strlen(name); | |
866 | for (i = 0; env[i]; i++) | |
867 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
868 | break; | |
869 | if (env[i]) { | |
870 | /* Reuse the slot. */ | |
871 | xfree(env[i]); | |
872 | } else { | |
873 | /* New variable. Expand if necessary. */ | |
c46e584f | 874 | envsize = *envsizep; |
875 | if (i >= envsize - 1) { | |
876 | if (envsize >= 1000) | |
877 | fatal("child_set_env: too many env vars"); | |
878 | envsize += 50; | |
c5d10563 | 879 | env = (*envp) = xrealloc(env, envsize, sizeof(char *)); |
c46e584f | 880 | *envsizep = envsize; |
7368a6c8 | 881 | } |
882 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
883 | env[i + 1] = NULL; | |
884 | } | |
885 | ||
886 | /* Allocate space and format the variable in the appropriate slot. */ | |
887 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
888 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
889 | } | |
890 | ||
891 | /* | |
892 | * Reads environment variables from the given file and adds/overrides them | |
893 | * into the environment. If the file does not exist, this does nothing. | |
894 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
895 | * and assignments of the form name=value. No other forms are allowed. | |
896 | */ | |
396c147e | 897 | static void |
1e3b8b07 | 898 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 899 | const char *filename) |
7368a6c8 | 900 | { |
901 | FILE *f; | |
902 | char buf[4096]; | |
903 | char *cp, *value; | |
66087567 | 904 | u_int lineno = 0; |
7368a6c8 | 905 | |
906 | f = fopen(filename, "r"); | |
907 | if (!f) | |
908 | return; | |
909 | ||
910 | while (fgets(buf, sizeof(buf), f)) { | |
66087567 | 911 | if (++lineno > 1000) |
912 | fatal("Too many lines in environment file %s", filename); | |
7368a6c8 | 913 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
914 | ; | |
915 | if (!*cp || *cp == '#' || *cp == '\n') | |
916 | continue; | |
b05117ac | 917 | |
918 | cp[strcspn(cp, "\n")] = '\0'; | |
919 | ||
7368a6c8 | 920 | value = strchr(cp, '='); |
921 | if (value == NULL) { | |
66087567 | 922 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
923 | filename); | |
7368a6c8 | 924 | continue; |
925 | } | |
71276795 | 926 | /* |
927 | * Replace the equals sign by nul, and advance value to | |
928 | * the value string. | |
929 | */ | |
7368a6c8 | 930 | *value = '\0'; |
931 | value++; | |
932 | child_set_env(env, envsize, cp, value); | |
933 | } | |
934 | fclose(f); | |
935 | } | |
936 | ||
95b99395 | 937 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
938 | /* | |
939 | * Return named variable from specified environment, or NULL if not present. | |
940 | */ | |
941 | static char * | |
942 | child_get_env(char **env, const char *name) | |
943 | { | |
944 | int i; | |
945 | size_t len; | |
946 | ||
947 | len = strlen(name); | |
948 | for (i=0; env[i] != NULL; i++) | |
949 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
950 | return(env[i] + len + 1); | |
951 | return NULL; | |
952 | } | |
953 | ||
954 | /* | |
955 | * Read /etc/default/login. | |
956 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
957 | */ | |
958 | static void | |
959 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
960 | { | |
961 | char **tmpenv = NULL, *var; | |
6f99680f | 962 | u_int i, tmpenvsize = 0; |
3a23ba0e | 963 | u_long mask; |
95b99395 | 964 | |
965 | /* | |
966 | * We don't want to copy the whole file to the child's environment, | |
967 | * so we use a temporary environment and copy the variables we're | |
968 | * interested in. | |
969 | */ | |
970 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
971 | ||
6f99680f | 972 | if (tmpenv == NULL) |
973 | return; | |
974 | ||
95b99395 | 975 | if (uid == 0) |
976 | var = child_get_env(tmpenv, "SUPATH"); | |
977 | else | |
978 | var = child_get_env(tmpenv, "PATH"); | |
979 | if (var != NULL) | |
980 | child_set_env(env, envsize, "PATH", var); | |
b6453d99 | 981 | |
95b99395 | 982 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
983 | if (sscanf(var, "%5lo", &mask) == 1) | |
3a23ba0e | 984 | umask((mode_t)mask); |
b6453d99 | 985 | |
95b99395 | 986 | for (i = 0; tmpenv[i] != NULL; i++) |
987 | xfree(tmpenv[i]); | |
988 | xfree(tmpenv); | |
989 | } | |
990 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
991 | ||
1db07e7d | 992 | void |
993 | copy_environment(char **source, char ***env, u_int *envsize) | |
7368a6c8 | 994 | { |
760b35a6 | 995 | char *var_name, *var_val; |
7368a6c8 | 996 | int i; |
997 | ||
760b35a6 | 998 | if (source == NULL) |
7368a6c8 | 999 | return; |
2b87da3b | 1000 | |
760b35a6 | 1001 | for(i = 0; source[i] != NULL; i++) { |
1002 | var_name = xstrdup(source[i]); | |
1003 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
1004 | xfree(var_name); | |
7368a6c8 | 1005 | continue; |
7368a6c8 | 1006 | } |
760b35a6 | 1007 | *var_val++ = '\0'; |
7368a6c8 | 1008 | |
760b35a6 | 1009 | debug3("Copy environment: %s=%s", var_name, var_val); |
1010 | child_set_env(env, envsize, var_name, var_val); | |
b6453d99 | 1011 | |
760b35a6 | 1012 | xfree(var_name); |
22d89d24 | 1013 | } |
1014 | } | |
22d89d24 | 1015 | |
f7342052 | 1016 | static char ** |
1017 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 1018 | { |
7368a6c8 | 1019 | char buf[256]; |
f7342052 | 1020 | u_int i, envsize; |
9b09381d | 1021 | char **env, *laddr; |
f7342052 | 1022 | struct passwd *pw = s->pw; |
9b09381d | 1023 | #ifndef HAVE_LOGIN_CAP |
1024 | char *path = NULL; | |
1025 | #endif | |
7368a6c8 | 1026 | |
7368a6c8 | 1027 | /* Initialize the environment. */ |
1028 | envsize = 100; | |
01d35895 | 1029 | env = xcalloc(envsize, sizeof(char *)); |
7368a6c8 | 1030 | env[0] = NULL; |
1031 | ||
3c62e7eb | 1032 | #ifdef HAVE_CYGWIN |
1033 | /* | |
1034 | * The Windows environment contains some setting which are | |
1035 | * important for a running system. They must not be dropped. | |
1036 | */ | |
3c502155 | 1037 | { |
1038 | char **p; | |
1039 | ||
1040 | p = fetch_windows_environment(); | |
1041 | copy_environment(p, &env, &envsize); | |
1042 | free_windows_environment(p); | |
1043 | } | |
3c62e7eb | 1044 | #endif |
1045 | ||
7364bd04 | 1046 | #ifdef GSSAPI |
aff51935 | 1047 | /* Allow any GSSAPI methods that we've used to alter |
7364bd04 | 1048 | * the childs environment as they see fit |
1049 | */ | |
1050 | ssh_gssapi_do_child(&env, &envsize); | |
1051 | #endif | |
1052 | ||
7368a6c8 | 1053 | if (!options.use_login) { |
1054 | /* Set basic environment. */ | |
61a2c1da | 1055 | for (i = 0; i < s->num_env; i++) |
f2107e97 | 1056 | child_set_env(&env, &envsize, s->env[i].name, |
61a2c1da | 1057 | s->env[i].val); |
1058 | ||
7368a6c8 | 1059 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1060 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
17ed08c5 | 1061 | #ifdef _AIX |
1062 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1063 | #endif | |
7368a6c8 | 1064 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
2e73a022 | 1065 | #ifdef HAVE_LOGIN_CAP |
97686bf9 | 1066 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1067 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1068 | else | |
1069 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1070 | #else /* HAVE_LOGIN_CAP */ |
1071 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1072 | /* |
1073 | * There's no standard path on Windows. The path contains | |
1074 | * important components pointing to the system directories, | |
1075 | * needed for loading shared libraries. So the path better | |
1076 | * remains intact here. | |
1077 | */ | |
95b99395 | 1078 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1079 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1080 | path = child_get_env(env, "PATH"); | |
1081 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1082 | if (path == NULL || *path == '\0') { | |
aff51935 | 1083 | child_set_env(&env, &envsize, "PATH", |
95b99395 | 1084 | s->pw->pw_uid == 0 ? |
1085 | SUPERUSER_PATH : _PATH_STDPATH); | |
1086 | } | |
22d89d24 | 1087 | # endif /* HAVE_CYGWIN */ |
1088 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1089 | |
1090 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1091 | _PATH_MAILDIR, pw->pw_name); | |
1092 | child_set_env(&env, &envsize, "MAIL", buf); | |
1093 | ||
1094 | /* Normal systems set SHELL by default. */ | |
1095 | child_set_env(&env, &envsize, "SHELL", shell); | |
1096 | } | |
1097 | if (getenv("TZ")) | |
1098 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1099 | ||
1100 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 1101 | if (!options.use_login) { |
1102 | while (custom_environment) { | |
1103 | struct envstring *ce = custom_environment; | |
7fdc56c5 | 1104 | char *str = ce->s; |
f7342052 | 1105 | |
7fdc56c5 | 1106 | for (i = 0; str[i] != '=' && str[i]; i++) |
2548961d | 1107 | ; |
7fdc56c5 | 1108 | if (str[i] == '=') { |
1109 | str[i] = 0; | |
1110 | child_set_env(&env, &envsize, str, str + i + 1); | |
2548961d | 1111 | } |
1112 | custom_environment = ce->next; | |
1113 | xfree(ce->s); | |
1114 | xfree(ce); | |
7368a6c8 | 1115 | } |
7368a6c8 | 1116 | } |
1117 | ||
da0561eb | 1118 | /* SSH_CLIENT deprecated */ |
7368a6c8 | 1119 | snprintf(buf, sizeof buf, "%.50s %d %d", |
f7342052 | 1120 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1121 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1122 | ||
3e2f2431 | 1123 | laddr = get_local_ipaddr(packet_get_connection_in()); |
da0561eb | 1124 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
3e2f2431 | 1125 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1126 | xfree(laddr); | |
da0561eb | 1127 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1128 | ||
56b3e9ce | 1129 | if (s->ttyfd != -1) |
1130 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1131 | if (s->term) | |
1132 | child_set_env(&env, &envsize, "TERM", s->term); | |
1133 | if (s->display) | |
1134 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1135 | if (original_command) |
1136 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1137 | original_command); | |
7368a6c8 | 1138 | |
ef51930f | 1139 | #ifdef _UNICOS |
1140 | if (cray_tmpdir[0] != '\0') | |
1141 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1142 | #endif /* _UNICOS */ | |
1143 | ||
3bfd27d5 | 1144 | /* |
1145 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1146 | * must have been set by a native authentication method (eg AIX or | |
1147 | * SIA), so copy it to the child. | |
1148 | */ | |
1149 | { | |
1150 | char *cp; | |
1151 | ||
1152 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1153 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1154 | } | |
1155 | ||
7368a6c8 | 1156 | #ifdef _AIX |
4936fcee | 1157 | { |
1158 | char *cp; | |
1159 | ||
1160 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1161 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
4936fcee | 1162 | read_environment_file(&env, &envsize, "/etc/environment"); |
1163 | } | |
7368a6c8 | 1164 | #endif |
ced49be2 | 1165 | #ifdef KRB5 |
6490a5d5 | 1166 | if (s->authctxt->krb5_ccname) |
ced49be2 | 1167 | child_set_env(&env, &envsize, "KRB5CCNAME", |
6490a5d5 | 1168 | s->authctxt->krb5_ccname); |
ced49be2 | 1169 | #endif |
7368a6c8 | 1170 | #ifdef USE_PAM |
ee48c949 | 1171 | /* |
1172 | * Pull in any environment variables that may have | |
1173 | * been set by PAM. | |
1174 | */ | |
7fceb20d | 1175 | if (options.use_pam) { |
2212fc98 | 1176 | char **p; |
b6453d99 | 1177 | |
2212fc98 | 1178 | p = fetch_pam_child_environment(); |
1179 | copy_environment(p, &env, &envsize); | |
1180 | free_pam_environment(p); | |
ee48c949 | 1181 | |
2212fc98 | 1182 | p = fetch_pam_environment(); |
ee48c949 | 1183 | copy_environment(p, &env, &envsize); |
1184 | free_pam_environment(p); | |
1185 | } | |
7368a6c8 | 1186 | #endif /* USE_PAM */ |
1187 | ||
149cdb60 | 1188 | if (auth_sock_name != NULL) |
7368a6c8 | 1189 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1190 | auth_sock_name); |
7368a6c8 | 1191 | |
1192 | /* read $HOME/.ssh/environment. */ | |
f00bab84 | 1193 | if (options.permit_user_env && !options.use_login) { |
71276795 | 1194 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e2e36358 | 1195 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
7368a6c8 | 1196 | read_environment_file(&env, &envsize, buf); |
1197 | } | |
1198 | if (debug_flag) { | |
1199 | /* dump the environment */ | |
1200 | fprintf(stderr, "Environment:\n"); | |
1201 | for (i = 0; env[i]; i++) | |
1202 | fprintf(stderr, " %.200s\n", env[i]); | |
1203 | } | |
f7342052 | 1204 | return env; |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1209 | * first in this order). | |
1210 | */ | |
1211 | static void | |
1212 | do_rc_files(Session *s, const char *shell) | |
1213 | { | |
1214 | FILE *f = NULL; | |
1215 | char cmd[1024]; | |
1216 | int do_xauth; | |
1217 | struct stat st; | |
1218 | ||
1219 | do_xauth = | |
1220 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1221 | ||
1222 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1223 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1224 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1225 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1226 | if (debug_flag) | |
1227 | fprintf(stderr, "Running %s\n", cmd); | |
1228 | f = popen(cmd, "w"); | |
1229 | if (f) { | |
1230 | if (do_xauth) | |
1231 | fprintf(f, "%s %s\n", s->auth_proto, | |
1232 | s->auth_data); | |
1233 | pclose(f); | |
1234 | } else | |
1235 | fprintf(stderr, "Could not run %s\n", | |
1236 | _PATH_SSH_USER_RC); | |
1237 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1238 | if (debug_flag) | |
1239 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1240 | _PATH_SSH_SYSTEM_RC); | |
1241 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1242 | if (f) { | |
1243 | if (do_xauth) | |
1244 | fprintf(f, "%s %s\n", s->auth_proto, | |
1245 | s->auth_data); | |
1246 | pclose(f); | |
1247 | } else | |
1248 | fprintf(stderr, "Could not run %s\n", | |
1249 | _PATH_SSH_SYSTEM_RC); | |
1250 | } else if (do_xauth && options.xauth_location != NULL) { | |
1251 | /* Add authority data to .Xauthority if appropriate. */ | |
1252 | if (debug_flag) { | |
1253 | fprintf(stderr, | |
fe661d8f | 1254 | "Running %.500s remove %.100s\n", |
2362db19 | 1255 | options.xauth_location, s->auth_display); |
fe661d8f | 1256 | fprintf(stderr, |
1257 | "%.500s add %.100s %.100s %.100s\n", | |
f7342052 | 1258 | options.xauth_location, s->auth_display, |
1259 | s->auth_proto, s->auth_data); | |
1260 | } | |
1261 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1262 | options.xauth_location); | |
1263 | f = popen(cmd, "w"); | |
1264 | if (f) { | |
fe661d8f | 1265 | fprintf(f, "remove %s\n", |
1266 | s->auth_display); | |
f7342052 | 1267 | fprintf(f, "add %s %s %s\n", |
1268 | s->auth_display, s->auth_proto, | |
1269 | s->auth_data); | |
1270 | pclose(f); | |
1271 | } else { | |
1272 | fprintf(stderr, "Could not run %s\n", | |
1273 | cmd); | |
1274 | } | |
1275 | } | |
1276 | } | |
1277 | ||
1278 | static void | |
1279 | do_nologin(struct passwd *pw) | |
1280 | { | |
1281 | FILE *f = NULL; | |
1282 | char buf[1024]; | |
1283 | ||
1284 | #ifdef HAVE_LOGIN_CAP | |
1285 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1286 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1287 | _PATH_NOLOGIN), "r"); | |
1288 | #else | |
1289 | if (pw->pw_uid) | |
1290 | f = fopen(_PATH_NOLOGIN, "r"); | |
1291 | #endif | |
1292 | if (f) { | |
1293 | /* /etc/nologin exists. Print its contents and exit. */ | |
bbe88b6d | 1294 | logit("User %.100s not allowed because %s exists", |
8bd4e2ae | 1295 | pw->pw_name, _PATH_NOLOGIN); |
f7342052 | 1296 | while (fgets(buf, sizeof(buf), f)) |
1297 | fputs(buf, stderr); | |
1298 | fclose(f); | |
99f4fb69 | 1299 | fflush(NULL); |
f7342052 | 1300 | exit(254); |
1301 | } | |
1302 | } | |
1303 | ||
db49deeb | 1304 | /* |
1305 | * Chroot into a directory after checking it for safety: all path components | |
1306 | * must be root-owned directories with strict permissions. | |
1307 | */ | |
1308 | static void | |
1309 | safely_chroot(const char *path, uid_t uid) | |
1310 | { | |
1311 | const char *cp; | |
1312 | char component[MAXPATHLEN]; | |
1313 | struct stat st; | |
1314 | ||
1315 | if (*path != '/') | |
1316 | fatal("chroot path does not begin at root"); | |
1317 | if (strlen(path) >= sizeof(component)) | |
1318 | fatal("chroot path too long"); | |
1319 | ||
1320 | /* | |
1321 | * Descend the path, checking that each component is a | |
1322 | * root-owned directory with strict permissions. | |
1323 | */ | |
1324 | for (cp = path; cp != NULL;) { | |
1325 | if ((cp = strchr(cp, '/')) == NULL) | |
1326 | strlcpy(component, path, sizeof(component)); | |
1327 | else { | |
1328 | cp++; | |
1329 | memcpy(component, path, cp - path); | |
1330 | component[cp - path] = '\0'; | |
1331 | } | |
1332 | ||
1333 | debug3("%s: checking '%s'", __func__, component); | |
1334 | ||
1335 | if (stat(component, &st) != 0) | |
1336 | fatal("%s: stat(\"%s\"): %s", __func__, | |
1337 | component, strerror(errno)); | |
1338 | if (st.st_uid != 0 || (st.st_mode & 022) != 0) | |
1339 | fatal("bad ownership or modes for chroot " | |
1340 | "directory %s\"%s\"", | |
1341 | cp == NULL ? "" : "component ", component); | |
1342 | if (!S_ISDIR(st.st_mode)) | |
1343 | fatal("chroot path %s\"%s\" is not a directory", | |
1344 | cp == NULL ? "" : "component ", component); | |
1345 | ||
1346 | } | |
1347 | ||
1348 | if (chdir(path) == -1) | |
1349 | fatal("Unable to chdir to chroot path \"%s\": " | |
1350 | "%s", path, strerror(errno)); | |
1351 | if (chroot(path) == -1) | |
1352 | fatal("chroot(\"%s\"): %s", path, strerror(errno)); | |
1353 | if (chdir("/") == -1) | |
1354 | fatal("%s: chdir(/) after chroot: %s", | |
1355 | __func__, strerror(errno)); | |
1356 | verbose("Changed root directory to \"%s\"", path); | |
1357 | } | |
1358 | ||
f7342052 | 1359 | /* Set login name, uid, gid, and groups. */ |
1853d1ef | 1360 | void |
f7342052 | 1361 | do_setusercontext(struct passwd *pw) |
1362 | { | |
c5bf32e6 | 1363 | char *chroot_path, *tmp; |
1364 | ||
2731632a | 1365 | #ifndef HAVE_CYGWIN |
1366 | if (getuid() == 0 || geteuid() == 0) | |
f7342052 | 1367 | #endif /* HAVE_CYGWIN */ |
2731632a | 1368 | { |
1369 | ||
8bbfc882 | 1370 | #ifdef HAVE_SETPCRED |
166baacc | 1371 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1372 | fatal("Failed to set process credentials"); | |
8bbfc882 | 1373 | #endif /* HAVE_SETPCRED */ |
f7342052 | 1374 | #ifdef HAVE_LOGIN_CAP |
2d199535 | 1375 | # ifdef __bsdi__ |
8695f9f7 | 1376 | setpgid(0, 0); |
2d199535 | 1377 | # endif |
09d7ebd1 | 1378 | #ifdef GSSAPI |
1379 | if (options.gss_authentication) { | |
1380 | temporarily_use_uid(pw); | |
1381 | ssh_gssapi_storecreds(); | |
1382 | restore_uid(); | |
1383 | } | |
1384 | #endif | |
f4eaee12 | 1385 | # ifdef USE_PAM |
1386 | if (options.use_pam) { | |
1387 | do_pam_session(); | |
265edd5e | 1388 | do_pam_setcred(use_privsep); |
f4eaee12 | 1389 | } |
1390 | # endif /* USE_PAM */ | |
f7342052 | 1391 | if (setusercontext(lc, pw, pw->pw_uid, |
db49deeb | 1392 | (LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETUSER))) < 0) { |
f7342052 | 1393 | perror("unable to set user context"); |
1394 | exit(1); | |
1395 | } | |
1396 | #else | |
1397 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1398 | /* Sets login uid for accounting */ | |
1399 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1400 | error("setluid: %s", strerror(errno)); | |
1401 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1402 | ||
1403 | if (setlogin(pw->pw_name) < 0) | |
1404 | error("setlogin failed: %s", strerror(errno)); | |
1405 | if (setgid(pw->pw_gid) < 0) { | |
1406 | perror("setgid"); | |
1407 | exit(1); | |
1408 | } | |
1409 | /* Initialize the group list. */ | |
1410 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1411 | perror("initgroups"); | |
1412 | exit(1); | |
1413 | } | |
1414 | endgrent(); | |
db49deeb | 1415 | # ifdef GSSAPI |
09d7ebd1 | 1416 | if (options.gss_authentication) { |
1417 | temporarily_use_uid(pw); | |
1418 | ssh_gssapi_storecreds(); | |
1419 | restore_uid(); | |
1420 | } | |
db49deeb | 1421 | # endif |
f7342052 | 1422 | # ifdef USE_PAM |
1423 | /* | |
aff51935 | 1424 | * PAM credentials may take the form of supplementary groups. |
f7342052 | 1425 | * These will have been wiped by the above initgroups() call. |
1426 | * Reestablish them here. | |
1427 | */ | |
49e82bb9 | 1428 | if (options.use_pam) { |
1429 | do_pam_session(); | |
265edd5e | 1430 | do_pam_setcred(use_privsep); |
49e82bb9 | 1431 | } |
f7342052 | 1432 | # endif /* USE_PAM */ |
1433 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1434 | irix_setusercontext(pw); | |
db49deeb | 1435 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ |
e2bc41f9 | 1436 | # ifdef _AIX |
0ba40daa | 1437 | aix_usrinfo(pw); |
e2bc41f9 | 1438 | # endif /* _AIX */ |
db49deeb | 1439 | # ifdef USE_LIBIAF |
4c653d8e | 1440 | if (set_id(pw->pw_name) != 0) { |
1441 | exit(1); | |
1442 | } | |
db49deeb | 1443 | # endif /* USE_LIBIAF */ |
1444 | #endif | |
1445 | ||
1446 | if (options.chroot_directory != NULL && | |
1447 | strcasecmp(options.chroot_directory, "none") != 0) { | |
c5bf32e6 | 1448 | tmp = tilde_expand_filename(options.chroot_directory, |
1449 | pw->pw_uid); | |
1450 | chroot_path = percent_expand(tmp, "h", pw->pw_dir, | |
1451 | "u", pw->pw_name, (char *)NULL); | |
db49deeb | 1452 | safely_chroot(chroot_path, pw->pw_uid); |
c5bf32e6 | 1453 | free(tmp); |
db49deeb | 1454 | free(chroot_path); |
1455 | } | |
1456 | ||
1457 | #ifdef HAVE_LOGIN_CAP | |
1458 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETUSER) < 0) { | |
1459 | perror("unable to set user context (setuser)"); | |
1460 | exit(1); | |
1461 | } | |
1462 | #else | |
f7342052 | 1463 | /* Permanently switch to the desired uid. */ |
1464 | permanently_set_uid(pw); | |
1465 | #endif | |
1466 | } | |
2731632a | 1467 | |
1468 | #ifdef HAVE_CYGWIN | |
1469 | if (is_winnt) | |
1470 | #endif | |
f7342052 | 1471 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1472 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
ef4d1846 | 1473 | |
1474 | #ifdef WITH_SELINUX | |
1475 | ssh_selinux_setup_exec_context(pw->pw_name); | |
1476 | #endif | |
f7342052 | 1477 | } |
1478 | ||
37656beb | 1479 | static void |
1480 | do_pwchange(Session *s) | |
1481 | { | |
be2ca0c9 | 1482 | fflush(NULL); |
37656beb | 1483 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1484 | if (s->ttyfd != -1) { | |
f2107e97 | 1485 | fprintf(stderr, |
37656beb | 1486 | "You must change your password now and login again!\n"); |
3ade3b57 | 1487 | #ifdef PASSWD_NEEDS_USERNAME |
1488 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1489 | (char *)NULL); | |
1490 | #else | |
37656beb | 1491 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
3ade3b57 | 1492 | #endif |
37656beb | 1493 | perror("passwd"); |
1494 | } else { | |
1495 | fprintf(stderr, | |
1496 | "Password change required but no TTY available.\n"); | |
1497 | } | |
1498 | exit(1); | |
1499 | } | |
1500 | ||
51aeb639 | 1501 | static void |
1853d1ef | 1502 | launch_login(struct passwd *pw, const char *hostname) |
1503 | { | |
1504 | /* Launch login(1). */ | |
1505 | ||
85cc9118 | 1506 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1507 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1508 | (s->term ? s->term : "unknown"), |
1853d1ef | 1509 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1510 | #ifdef LOGIN_NO_ENDOPT |
1511 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1512 | #else | |
1853d1ef | 1513 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1514 | #endif |
1853d1ef | 1515 | |
1516 | /* Login couldn't be executed, die. */ | |
1517 | ||
1518 | perror("login"); | |
1519 | exit(1); | |
1520 | } | |
1521 | ||
37656beb | 1522 | static void |
1523 | child_close_fds(void) | |
1524 | { | |
1525 | int i; | |
1526 | ||
1527 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1528 | close(packet_get_connection_in()); | |
1529 | else { | |
1530 | close(packet_get_connection_in()); | |
1531 | close(packet_get_connection_out()); | |
1532 | } | |
1533 | /* | |
1534 | * Close all descriptors related to channels. They will still remain | |
1535 | * open in the parent. | |
1536 | */ | |
1537 | /* XXX better use close-on-exec? -markus */ | |
1538 | channel_close_all(); | |
1539 | ||
1540 | /* | |
1541 | * Close any extra file descriptors. Note that there may still be | |
1542 | * descriptors left by system functions. They will be closed later. | |
1543 | */ | |
1544 | endpwent(); | |
1545 | ||
1546 | /* | |
7b9b0103 | 1547 | * Close any extra open file descriptors so that we don't have them |
37656beb | 1548 | * hanging around in clients. Note that we want to do this after |
1549 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1550 | * descriptors open. | |
1551 | */ | |
1552 | for (i = 3; i < 64; i++) | |
1553 | close(i); | |
1554 | } | |
1555 | ||
f7342052 | 1556 | /* |
1557 | * Performs common processing for the child, such as setting up the | |
1558 | * environment, closing extra file descriptors, setting the user and group | |
1559 | * ids, and executing the command or shell. | |
1560 | */ | |
c33ba17e | 1561 | #define ARGV_MAX 10 |
f7342052 | 1562 | void |
1563 | do_child(Session *s, const char *command) | |
1564 | { | |
1565 | extern char **environ; | |
1566 | char **env; | |
c33ba17e | 1567 | char *argv[ARGV_MAX]; |
f7342052 | 1568 | const char *shell, *shell0, *hostname = NULL; |
1569 | struct passwd *pw = s->pw; | |
f7342052 | 1570 | |
1571 | /* remove hostkey from the child's memory */ | |
1572 | destroy_sensitive_data(); | |
1573 | ||
37656beb | 1574 | /* Force a password change */ |
1575 | if (s->authctxt->force_pwchange) { | |
1576 | do_setusercontext(pw); | |
1577 | child_close_fds(); | |
1578 | do_pwchange(s); | |
1579 | exit(1); | |
1580 | } | |
1581 | ||
f7342052 | 1582 | /* login(1) is only called if we execute the login shell */ |
1583 | if (options.use_login && command != NULL) | |
1584 | options.use_login = 0; | |
1585 | ||
ef51930f | 1586 | #ifdef _UNICOS |
1587 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1588 | #endif /* _UNICOS */ | |
1589 | ||
f7342052 | 1590 | /* |
1591 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1592 | * switch, so we let login(1) to this for us. | |
1593 | */ | |
1594 | if (!options.use_login) { | |
1595 | #ifdef HAVE_OSF_SIA | |
58d0df4e | 1596 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
f7342052 | 1597 | if (!check_quietlogin(s, command)) |
1598 | do_motd(); | |
1599 | #else /* HAVE_OSF_SIA */ | |
0a61a240 | 1600 | /* When PAM is enabled we rely on it to do the nologin check */ |
1601 | if (!options.use_pam) | |
1602 | do_nologin(pw); | |
f7342052 | 1603 | do_setusercontext(pw); |
25bfd4ff | 1604 | /* |
1605 | * PAM session modules in do_setusercontext may have | |
1606 | * generated messages, so if this in an interactive | |
1607 | * login then display them too. | |
1608 | */ | |
d0c890ac | 1609 | if (!check_quietlogin(s, command)) |
25bfd4ff | 1610 | display_loginmsg(); |
f7342052 | 1611 | #endif /* HAVE_OSF_SIA */ |
1612 | } | |
1613 | ||
abdec250 | 1614 | #ifdef USE_PAM |
d9720710 | 1615 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1616 | debug3("PAM session not opened, exiting"); | |
abdec250 | 1617 | display_loginmsg(); |
1618 | exit(254); | |
1619 | } | |
1620 | #endif | |
1621 | ||
f7342052 | 1622 | /* |
1623 | * Get the shell from the password data. An empty shell field is | |
1624 | * legal, and means /bin/sh. | |
1625 | */ | |
1626 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
32214c88 | 1627 | |
1628 | /* | |
1629 | * Make sure $SHELL points to the shell from the password file, | |
1630 | * even if shell is overridden from login.conf | |
1631 | */ | |
1632 | env = do_setup_env(s, shell); | |
1633 | ||
f7342052 | 1634 | #ifdef HAVE_LOGIN_CAP |
1635 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1636 | #endif | |
1637 | ||
2e73a022 | 1638 | /* we have to stash the hostname before we close our socket. */ |
1639 | if (options.use_login) | |
46e3af7f | 1640 | hostname = get_remote_name_or_ip(utmp_len, |
c5a7d788 | 1641 | options.use_dns); |
7368a6c8 | 1642 | /* |
1643 | * Close the connection descriptors; note that this is the child, and | |
1644 | * the server will still have the socket open, and it is important | |
1645 | * that we do not shutdown it. Note that the descriptors cannot be | |
1646 | * closed before building the environment, as we call | |
1647 | * get_remote_ipaddr there. | |
1648 | */ | |
37656beb | 1649 | child_close_fds(); |
7368a6c8 | 1650 | |
7368a6c8 | 1651 | /* |
2a8a6488 | 1652 | * Must take new environment into use so that .ssh/rc, |
1653 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1654 | */ |
1655 | environ = env; | |
1656 | ||
bcfcc5f9 | 1657 | #if defined(KRB5) && defined(USE_AFS) |
a1e30b47 | 1658 | /* |
1659 | * At this point, we check to see if AFS is active and if we have | |
1660 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1661 | * if we can (and need to) extend the ticket into an AFS token. If | |
1662 | * we don't do this, we run into potential problems if the user's | |
1663 | * home directory is in AFS and it's not world-readable. | |
1664 | */ | |
1665 | ||
1666 | if (options.kerberos_get_afs_token && k_hasafs() && | |
4e2e5cfd | 1667 | (s->authctxt->krb5_ctx != NULL)) { |
a1e30b47 | 1668 | char cell[64]; |
1669 | ||
1670 | debug("Getting AFS token"); | |
1671 | ||
1672 | k_setpag(); | |
1673 | ||
1674 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1675 | krb5_afslog(s->authctxt->krb5_ctx, | |
1676 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1677 | ||
1678 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1679 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1680 | } | |
1681 | #endif | |
1682 | ||
7b9b0103 | 1683 | /* Change current directory to the user's home directory. */ |
dab89049 | 1684 | if (chdir(pw->pw_dir) < 0) { |
1685 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1686 | pw->pw_dir, strerror(errno)); | |
1687 | #ifdef HAVE_LOGIN_CAP | |
1688 | if (login_getcapbool(lc, "requirehome", 0)) | |
1689 | exit(1); | |
1690 | #endif | |
1691 | } | |
1692 | ||
f7342052 | 1693 | if (!options.use_login) |
1694 | do_rc_files(s, shell); | |
1d3c30db | 1695 | |
1696 | /* restore SIGPIPE for child */ | |
c56969f9 | 1697 | signal(SIGPIPE, SIG_DFL); |
1d3c30db | 1698 | |
c33ba17e | 1699 | if (s->is_subsystem == SUBSYSTEM_INT_SFTP) { |
1700 | extern int optind, optreset; | |
1701 | int i; | |
1702 | char *p, *args; | |
1703 | ||
1704 | setproctitle("%s@internal-sftp-server", s->pw->pw_name); | |
1705 | args = strdup(command ? command : "sftp-server"); | |
1706 | for (i = 0, (p = strtok(args, " ")); p; (p = strtok(NULL, " "))) | |
1707 | if (i < ARGV_MAX - 1) | |
1708 | argv[i++] = p; | |
1709 | argv[i] = NULL; | |
1710 | optind = optreset = 1; | |
1711 | __progname = argv[0]; | |
db49deeb | 1712 | exit(sftp_server_main(i, argv, s->pw)); |
c33ba17e | 1713 | } |
1714 | ||
f7342052 | 1715 | if (options.use_login) { |
1853d1ef | 1716 | launch_login(pw, hostname); |
1717 | /* NEVERREACHED */ | |
f7342052 | 1718 | } |
1719 | ||
1720 | /* Get the last component of the shell name. */ | |
1721 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1722 | shell0++; | |
1723 | else | |
1724 | shell0 = shell; | |
1725 | ||
7368a6c8 | 1726 | /* |
1727 | * If we have no command, execute the shell. In this case, the shell | |
1728 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1729 | * this is a login shell. | |
1730 | */ | |
1731 | if (!command) { | |
f7342052 | 1732 | char argv0[256]; |
7368a6c8 | 1733 | |
f7342052 | 1734 | /* Start the shell. Set initial character to '-'. */ |
1735 | argv0[0] = '-'; | |
7368a6c8 | 1736 | |
f7342052 | 1737 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1738 | >= sizeof(argv0) - 1) { | |
1739 | errno = EINVAL; | |
7368a6c8 | 1740 | perror(shell); |
1741 | exit(1); | |
f7342052 | 1742 | } |
7368a6c8 | 1743 | |
f7342052 | 1744 | /* Execute the shell. */ |
1745 | argv[0] = argv0; | |
1746 | argv[1] = NULL; | |
1747 | execve(shell, argv, env); | |
7368a6c8 | 1748 | |
f7342052 | 1749 | /* Executing the shell failed. */ |
1750 | perror(shell); | |
1751 | exit(1); | |
7368a6c8 | 1752 | } |
1753 | /* | |
1754 | * Execute the command using the user's shell. This uses the -c | |
1755 | * option to execute the command. | |
1756 | */ | |
f7342052 | 1757 | argv[0] = (char *) shell0; |
7368a6c8 | 1758 | argv[1] = "-c"; |
1759 | argv[2] = (char *) command; | |
1760 | argv[3] = NULL; | |
1761 | execve(shell, argv, env); | |
1762 | perror(shell); | |
1763 | exit(1); | |
1764 | } | |
1765 | ||
1766 | Session * | |
1767 | session_new(void) | |
1768 | { | |
1769 | int i; | |
1770 | static int did_init = 0; | |
1771 | if (!did_init) { | |
1772 | debug("session_new: init"); | |
184eed6a | 1773 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1774 | sessions[i].used = 0; |
7368a6c8 | 1775 | } |
1776 | did_init = 1; | |
1777 | } | |
184eed6a | 1778 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1779 | Session *s = &sessions[i]; |
1780 | if (! s->used) { | |
690d0d7f | 1781 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1782 | s->chanid = -1; |
1783 | s->ptyfd = -1; | |
1784 | s->ttyfd = -1; | |
7368a6c8 | 1785 | s->used = 1; |
86066315 | 1786 | s->self = i; |
d08341e6 | 1787 | s->x11_chanids = NULL; |
02323c45 | 1788 | debug("session_new: session %d", i); |
7368a6c8 | 1789 | return s; |
1790 | } | |
1791 | } | |
1792 | return NULL; | |
1793 | } | |
1794 | ||
396c147e | 1795 | static void |
7368a6c8 | 1796 | session_dump(void) |
1797 | { | |
1798 | int i; | |
184eed6a | 1799 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1800 | Session *s = &sessions[i]; |
c457707e | 1801 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1802 | s->used, |
1803 | s->self, | |
1804 | s, | |
1805 | s->chanid, | |
c457707e | 1806 | (long)s->pid); |
7368a6c8 | 1807 | } |
1808 | } | |
1809 | ||
e78a59f5 | 1810 | int |
57156994 | 1811 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1812 | { |
1813 | Session *s = session_new(); | |
1814 | debug("session_open: channel %d", chanid); | |
1815 | if (s == NULL) { | |
1816 | error("no more sessions"); | |
1817 | return 0; | |
1818 | } | |
57156994 | 1819 | s->authctxt = authctxt; |
1820 | s->pw = authctxt->pw; | |
fdaef11e | 1821 | if (s->pw == NULL || !authctxt->valid) |
0725ea77 | 1822 | fatal("no user for session %d", s->self); |
0b242b12 | 1823 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1824 | s->chanid = chanid; | |
e78a59f5 | 1825 | return 1; |
1826 | } | |
1827 | ||
1853d1ef | 1828 | Session * |
1829 | session_by_tty(char *tty) | |
1830 | { | |
1831 | int i; | |
1832 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1833 | Session *s = &sessions[i]; | |
1834 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1835 | debug("session_by_tty: session %d tty %s", i, tty); | |
1836 | return s; | |
1837 | } | |
1838 | } | |
1839 | debug("session_by_tty: unknown tty %.100s", tty); | |
1840 | session_dump(); | |
1841 | return NULL; | |
1842 | } | |
1843 | ||
396c147e | 1844 | static Session * |
e78a59f5 | 1845 | session_by_channel(int id) |
1846 | { | |
1847 | int i; | |
184eed6a | 1848 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1849 | Session *s = &sessions[i]; |
1850 | if (s->used && s->chanid == id) { | |
1851 | debug("session_by_channel: session %d channel %d", i, id); | |
1852 | return s; | |
1853 | } | |
1854 | } | |
1855 | debug("session_by_channel: unknown channel %d", id); | |
1856 | session_dump(); | |
1857 | return NULL; | |
1858 | } | |
1859 | ||
d08341e6 | 1860 | static Session * |
1861 | session_by_x11_channel(int id) | |
1862 | { | |
1863 | int i, j; | |
1864 | ||
1865 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1866 | Session *s = &sessions[i]; | |
1867 | ||
1868 | if (s->x11_chanids == NULL || !s->used) | |
1869 | continue; | |
1870 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
1871 | if (s->x11_chanids[j] == id) { | |
1872 | debug("session_by_x11_channel: session %d " | |
1873 | "channel %d", s->self, id); | |
1874 | return s; | |
1875 | } | |
1876 | } | |
1877 | } | |
1878 | debug("session_by_x11_channel: unknown channel %d", id); | |
1879 | session_dump(); | |
1880 | return NULL; | |
1881 | } | |
1882 | ||
396c147e | 1883 | static Session * |
e78a59f5 | 1884 | session_by_pid(pid_t pid) |
1885 | { | |
1886 | int i; | |
c457707e | 1887 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1888 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1889 | Session *s = &sessions[i]; |
1890 | if (s->used && s->pid == pid) | |
1891 | return s; | |
1892 | } | |
c457707e | 1893 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1894 | session_dump(); |
1895 | return NULL; | |
1896 | } | |
1897 | ||
396c147e | 1898 | static int |
e78a59f5 | 1899 | session_window_change_req(Session *s) |
1900 | { | |
1901 | s->col = packet_get_int(); | |
1902 | s->row = packet_get_int(); | |
1903 | s->xpixel = packet_get_int(); | |
1904 | s->ypixel = packet_get_int(); | |
95500969 | 1905 | packet_check_eom(); |
e78a59f5 | 1906 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1907 | return 1; | |
1908 | } | |
1909 | ||
396c147e | 1910 | static int |
e78a59f5 | 1911 | session_pty_req(Session *s) |
1912 | { | |
1e3b8b07 | 1913 | u_int len; |
30dcc918 | 1914 | int n_bytes; |
762715ce | 1915 | |
653d5f86 | 1916 | if (no_pty_flag) { |
1917 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1918 | return 0; |
653d5f86 | 1919 | } |
1920 | if (s->ttyfd != -1) { | |
1921 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1922 | return 0; |
653d5f86 | 1923 | } |
1924 | ||
e78a59f5 | 1925 | s->term = packet_get_string(&len); |
653d5f86 | 1926 | |
1927 | if (compat20) { | |
1928 | s->col = packet_get_int(); | |
1929 | s->row = packet_get_int(); | |
1930 | } else { | |
1931 | s->row = packet_get_int(); | |
1932 | s->col = packet_get_int(); | |
1933 | } | |
e78a59f5 | 1934 | s->xpixel = packet_get_int(); |
1935 | s->ypixel = packet_get_int(); | |
1936 | ||
1937 | if (strcmp(s->term, "") == 0) { | |
1938 | xfree(s->term); | |
1939 | s->term = NULL; | |
1940 | } | |
653d5f86 | 1941 | |
e78a59f5 | 1942 | /* Allocate a pty and open it. */ |
653d5f86 | 1943 | debug("Allocating pty."); |
1853d1ef | 1944 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1945 | if (s->term) |
1946 | xfree(s->term); | |
e78a59f5 | 1947 | s->term = NULL; |
1948 | s->ptyfd = -1; | |
1949 | s->ttyfd = -1; | |
1950 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1951 | return 0; |
e78a59f5 | 1952 | } |
1953 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1954 | |
1955 | /* for SSH1 the tty modes length is not given */ | |
1956 | if (!compat20) | |
1957 | n_bytes = packet_remaining(); | |
1958 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1959 | ||
1853d1ef | 1960 | if (!use_privsep) |
1961 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1962 | |
1963 | /* Set window size from the packet. */ | |
e78a59f5 | 1964 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1965 | ||
95500969 | 1966 | packet_check_eom(); |
1d1ffb87 | 1967 | session_proctitle(s); |
e78a59f5 | 1968 | return 1; |
1969 | } | |
1970 | ||
396c147e | 1971 | static int |
0b242b12 | 1972 | session_subsystem_req(Session *s) |
1973 | { | |
01855277 | 1974 | struct stat st; |
1e3b8b07 | 1975 | u_int len; |
0b242b12 | 1976 | int success = 0; |
d66ce1a1 | 1977 | char *prog, *cmd, *subsys = packet_get_string(&len); |
2ceb8101 | 1978 | u_int i; |
0b242b12 | 1979 | |
95500969 | 1980 | packet_check_eom(); |
bbe88b6d | 1981 | logit("subsystem request for %.100s", subsys); |
0b242b12 | 1982 | |
38c295d6 | 1983 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1984 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
d66ce1a1 | 1985 | prog = options.subsystem_command[i]; |
1986 | cmd = options.subsystem_args[i]; | |
db49deeb | 1987 | if (!strcmp(INTERNAL_SFTP_NAME, prog)) { |
c33ba17e | 1988 | s->is_subsystem = SUBSYSTEM_INT_SFTP; |
1989 | } else if (stat(prog, &st) < 0) { | |
d66ce1a1 | 1990 | error("subsystem: cannot stat %s: %s", prog, |
01855277 | 1991 | strerror(errno)); |
1992 | break; | |
c33ba17e | 1993 | } else { |
1994 | s->is_subsystem = SUBSYSTEM_EXT; | |
01855277 | 1995 | } |
1996 | debug("subsystem: exec() %s", cmd); | |
01855277 | 1997 | do_exec(s, cmd); |
38c295d6 | 1998 | success = 1; |
24932ee9 | 1999 | break; |
38c295d6 | 2000 | } |
2001 | } | |
2002 | ||
2003 | if (!success) | |
bbe88b6d | 2004 | logit("subsystem request for %.100s failed, subsystem not found", |
01855277 | 2005 | subsys); |
38c295d6 | 2006 | |
0b242b12 | 2007 | xfree(subsys); |
2008 | return success; | |
2009 | } | |
2010 | ||
396c147e | 2011 | static int |
0b242b12 | 2012 | session_x11_req(Session *s) |
2013 | { | |
8dcd9d5c | 2014 | int success; |
0b242b12 | 2015 | |
d08341e6 | 2016 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
2017 | error("session_x11_req: session %d: " | |
8918b906 | 2018 | "x11 forwarding already active", s->self); |
d08341e6 | 2019 | return 0; |
2020 | } | |
0b242b12 | 2021 | s->single_connection = packet_get_char(); |
2022 | s->auth_proto = packet_get_string(NULL); | |
2023 | s->auth_data = packet_get_string(NULL); | |
2024 | s->screen = packet_get_int(); | |
95500969 | 2025 | packet_check_eom(); |
0b242b12 | 2026 | |
8dcd9d5c | 2027 | success = session_setup_x11fwd(s); |
2028 | if (!success) { | |
0b242b12 | 2029 | xfree(s->auth_proto); |
2030 | xfree(s->auth_data); | |
1500bcdd | 2031 | s->auth_proto = NULL; |
2032 | s->auth_data = NULL; | |
0b242b12 | 2033 | } |
8dcd9d5c | 2034 | return success; |
0b242b12 | 2035 | } |
2036 | ||
396c147e | 2037 | static int |
38c295d6 | 2038 | session_shell_req(Session *s) |
2039 | { | |
95500969 | 2040 | packet_check_eom(); |
dac6753b | 2041 | do_exec(s, NULL); |
38c295d6 | 2042 | return 1; |
2043 | } | |
2044 | ||
396c147e | 2045 | static int |
38c295d6 | 2046 | session_exec_req(Session *s) |
2047 | { | |
1e3b8b07 | 2048 | u_int len; |
38c295d6 | 2049 | char *command = packet_get_string(&len); |
95500969 | 2050 | packet_check_eom(); |
dac6753b | 2051 | do_exec(s, command); |
c95add71 | 2052 | xfree(command); |
38c295d6 | 2053 | return 1; |
2054 | } | |
2055 | ||
16a79097 | 2056 | static int |
2057 | session_break_req(Session *s) | |
2058 | { | |
16a79097 | 2059 | |
f6be21a0 | 2060 | packet_get_int(); /* ignored */ |
16a79097 | 2061 | packet_check_eom(); |
2062 | ||
8168a86a | 2063 | if (s->ttyfd == -1 || |
2064 | tcsendbreak(s->ttyfd, 0) < 0) | |
16a79097 | 2065 | return 0; |
16a79097 | 2066 | return 1; |
2067 | } | |
2068 | ||
61a2c1da | 2069 | static int |
2070 | session_env_req(Session *s) | |
2071 | { | |
2072 | char *name, *val; | |
2073 | u_int name_len, val_len, i; | |
2074 | ||
2075 | name = packet_get_string(&name_len); | |
2076 | val = packet_get_string(&val_len); | |
2077 | packet_check_eom(); | |
2078 | ||
2079 | /* Don't set too many environment variables */ | |
2080 | if (s->num_env > 128) { | |
2081 | debug2("Ignoring env request %s: too many env vars", name); | |
2082 | goto fail; | |
2083 | } | |
2084 | ||
2085 | for (i = 0; i < options.num_accept_env; i++) { | |
2086 | if (match_pattern(name, options.accept_env[i])) { | |
2087 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
c5d10563 | 2088 | s->env = xrealloc(s->env, s->num_env + 1, |
2089 | sizeof(*s->env)); | |
61a2c1da | 2090 | s->env[s->num_env].name = name; |
2091 | s->env[s->num_env].val = val; | |
2092 | s->num_env++; | |
2093 | return (1); | |
2094 | } | |
2095 | } | |
2096 | debug2("Ignoring env request %s: disallowed name", name); | |
2097 | ||
2098 | fail: | |
2099 | xfree(name); | |
2100 | xfree(val); | |
2101 | return (0); | |
2102 | } | |
2103 | ||
396c147e | 2104 | static int |
fa08c86b | 2105 | session_auth_agent_req(Session *s) |
2106 | { | |
2107 | static int called = 0; | |
95500969 | 2108 | packet_check_eom(); |
d343d900 | 2109 | if (no_agent_forwarding_flag) { |
2110 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
2111 | return 0; | |
2112 | } | |
fa08c86b | 2113 | if (called) { |
2114 | return 0; | |
2115 | } else { | |
2116 | called = 1; | |
2117 | return auth_input_request_forwarding(s->pw); | |
2118 | } | |
2119 | } | |
2120 | ||
7899c98f | 2121 | int |
2122 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 2123 | { |
e78a59f5 | 2124 | int success = 0; |
e78a59f5 | 2125 | Session *s; |
e78a59f5 | 2126 | |
7899c98f | 2127 | if ((s = session_by_channel(c->self)) == NULL) { |
bbe88b6d | 2128 | logit("session_input_channel_req: no session %d req %.100s", |
7899c98f | 2129 | c->self, rtype); |
2130 | return 0; | |
2131 | } | |
2132 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 2133 | |
2134 | /* | |
e5d7a405 | 2135 | * a session is in LARVAL state until a shell, a command |
2136 | * or a subsystem is executed | |
e78a59f5 | 2137 | */ |
2138 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2139 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 2140 | success = session_shell_req(s); |
e78a59f5 | 2141 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 2142 | success = session_exec_req(s); |
e78a59f5 | 2143 | } else if (strcmp(rtype, "pty-req") == 0) { |
803c4226 | 2144 | success = session_pty_req(s); |
0b242b12 | 2145 | } else if (strcmp(rtype, "x11-req") == 0) { |
2146 | success = session_x11_req(s); | |
fa08c86b | 2147 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
2148 | success = session_auth_agent_req(s); | |
0b242b12 | 2149 | } else if (strcmp(rtype, "subsystem") == 0) { |
2150 | success = session_subsystem_req(s); | |
61a2c1da | 2151 | } else if (strcmp(rtype, "env") == 0) { |
2152 | success = session_env_req(s); | |
e78a59f5 | 2153 | } |
2154 | } | |
2155 | if (strcmp(rtype, "window-change") == 0) { | |
2156 | success = session_window_change_req(s); | |
c6c76c99 | 2157 | } else if (strcmp(rtype, "break") == 0) { |
2158 | success = session_break_req(s); | |
e78a59f5 | 2159 | } |
c6c76c99 | 2160 | |
7899c98f | 2161 | return success; |
e78a59f5 | 2162 | } |
2163 | ||
2164 | void | |
2165 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2166 | { | |
2167 | if (!compat20) | |
2168 | fatal("session_set_fds: called for proto != 2.0"); | |
2169 | /* | |
2170 | * now that have a child and a pipe to the child, | |
2171 | * we can activate our channel and register the fd's | |
2172 | */ | |
2173 | if (s->chanid == -1) | |
2174 | fatal("no channel for session %d", s->self); | |
2175 | channel_set_fds(s->chanid, | |
2176 | fdout, fdin, fderr, | |
a22aff1f | 2177 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 2178 | 1, |
2179 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 2180 | } |
2181 | ||
86066315 | 2182 | /* |
2183 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2184 | * (e.g., due to a dropped connection). | |
2185 | */ | |
1853d1ef | 2186 | void |
2362db19 | 2187 | session_pty_cleanup2(Session *s) |
7368a6c8 | 2188 | { |
86066315 | 2189 | if (s == NULL) { |
2190 | error("session_pty_cleanup: no session"); | |
2191 | return; | |
2192 | } | |
2193 | if (s->ttyfd == -1) | |
7368a6c8 | 2194 | return; |
2195 | ||
0725ea77 | 2196 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 2197 | |
7368a6c8 | 2198 | /* Record that the user has logged out. */ |
86066315 | 2199 | if (s->pid != 0) |
f3837bc6 | 2200 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 2201 | |
2202 | /* Release the pseudo-tty. */ | |
1853d1ef | 2203 | if (getuid() == 0) |
2204 | pty_release(s->tty); | |
7368a6c8 | 2205 | |
2206 | /* | |
2207 | * Close the server side of the socket pairs. We must do this after | |
2208 | * the pty cleanup, so that another process doesn't get this pty | |
2209 | * while we're still cleaning up. | |
2210 | */ | |
2211 | if (close(s->ptymaster) < 0) | |
1853d1ef | 2212 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 2213 | |
2214 | /* unlink pty from session */ | |
2215 | s->ttyfd = -1; | |
7368a6c8 | 2216 | } |
e78a59f5 | 2217 | |
1853d1ef | 2218 | void |
2362db19 | 2219 | session_pty_cleanup(Session *s) |
1853d1ef | 2220 | { |
2362db19 | 2221 | PRIVSEP(session_pty_cleanup2(s)); |
1853d1ef | 2222 | } |
2223 | ||
6c723e7c | 2224 | static char * |
2225 | sig2name(int sig) | |
2226 | { | |
2227 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2228 | SSH_SIG(ABRT); | |
2229 | SSH_SIG(ALRM); | |
2230 | SSH_SIG(FPE); | |
2231 | SSH_SIG(HUP); | |
2232 | SSH_SIG(ILL); | |
2233 | SSH_SIG(INT); | |
2234 | SSH_SIG(KILL); | |
2235 | SSH_SIG(PIPE); | |
2236 | SSH_SIG(QUIT); | |
2237 | SSH_SIG(SEGV); | |
2238 | SSH_SIG(TERM); | |
2239 | SSH_SIG(USR1); | |
2240 | SSH_SIG(USR2); | |
2241 | #undef SSH_SIG | |
2242 | return "SIG@openssh.com"; | |
2243 | } | |
2244 | ||
d08341e6 | 2245 | static void |
2246 | session_close_x11(int id) | |
2247 | { | |
2248 | Channel *c; | |
2249 | ||
b872f7f0 | 2250 | if ((c = channel_by_id(id)) == NULL) { |
d08341e6 | 2251 | debug("session_close_x11: x11 channel %d missing", id); |
2252 | } else { | |
2253 | /* Detach X11 listener */ | |
2254 | debug("session_close_x11: detach x11 channel %d", id); | |
2255 | channel_cancel_cleanup(id); | |
2256 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2257 | chan_mark_dead(c); | |
2258 | } | |
2259 | } | |
2260 | ||
2261 | static void | |
2262 | session_close_single_x11(int id, void *arg) | |
2263 | { | |
2264 | Session *s; | |
2265 | u_int i; | |
2266 | ||
2267 | debug3("session_close_single_x11: channel %d", id); | |
2268 | channel_cancel_cleanup(id); | |
803c4226 | 2269 | if ((s = session_by_x11_channel(id)) == NULL) |
d08341e6 | 2270 | fatal("session_close_single_x11: no x11 channel %d", id); |
2271 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2272 | debug("session_close_single_x11: session %d: " | |
2273 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2274 | /* | |
2275 | * The channel "id" is already closing, but make sure we | |
2276 | * close all of its siblings. | |
2277 | */ | |
2278 | if (s->x11_chanids[i] != id) | |
2279 | session_close_x11(s->x11_chanids[i]); | |
2280 | } | |
2281 | xfree(s->x11_chanids); | |
2282 | s->x11_chanids = NULL; | |
2283 | if (s->display) { | |
2284 | xfree(s->display); | |
2285 | s->display = NULL; | |
2286 | } | |
2287 | if (s->auth_proto) { | |
2288 | xfree(s->auth_proto); | |
2289 | s->auth_proto = NULL; | |
2290 | } | |
2291 | if (s->auth_data) { | |
2292 | xfree(s->auth_data); | |
2293 | s->auth_data = NULL; | |
2294 | } | |
2295 | if (s->auth_display) { | |
2296 | xfree(s->auth_display); | |
2297 | s->auth_display = NULL; | |
2298 | } | |
2299 | } | |
2300 | ||
396c147e | 2301 | static void |
e78a59f5 | 2302 | session_exit_message(Session *s, int status) |
2303 | { | |
2304 | Channel *c; | |
5a4ae906 | 2305 | |
2306 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 2307 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 2308 | s->self, s->chanid); |
c457707e | 2309 | debug("session_exit_message: session %d channel %d pid %ld", |
2310 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 2311 | |
2312 | if (WIFEXITED(status)) { | |
5a4ae906 | 2313 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 2314 | packet_put_int(WEXITSTATUS(status)); |
2315 | packet_send(); | |
2316 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 2317 | channel_request_start(s->chanid, "exit-signal", 0); |
6c723e7c | 2318 | packet_put_cstring(sig2name(WTERMSIG(status))); |
a64009ad | 2319 | #ifdef WCOREDUMP |
e2875d9a | 2320 | packet_put_char(WCOREDUMP(status)? 1 : 0); |
a64009ad | 2321 | #else /* WCOREDUMP */ |
2322 | packet_put_char(0); | |
2323 | #endif /* WCOREDUMP */ | |
e78a59f5 | 2324 | packet_put_cstring(""); |
2325 | packet_put_cstring(""); | |
2326 | packet_send(); | |
2327 | } else { | |
2328 | /* Some weird exit cause. Just exit. */ | |
2329 | packet_disconnect("wait returned status %04x.", status); | |
2330 | } | |
2331 | ||
2332 | /* disconnect channel */ | |
2333 | debug("session_exit_message: release channel %d", s->chanid); | |
8cd0437d | 2334 | |
2335 | /* | |
2336 | * Adjust cleanup callback attachment to send close messages when | |
b4bbf172 | 2337 | * the channel gets EOF. The session will be then be closed |
8cd0437d | 2338 | * by session_close_by_channel when the childs close their fds. |
2339 | */ | |
2340 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2341 | ||
9da5c3c9 | 2342 | /* |
2343 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2344 | * interested in data we write. | |
2345 | * Note that we must not call 'chan_read_failed', since there could | |
2346 | * be some more data waiting in the pipe. | |
2347 | */ | |
0b242b12 | 2348 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
2349 | chan_write_failed(c); | |
e78a59f5 | 2350 | } |
2351 | ||
1853d1ef | 2352 | void |
86066315 | 2353 | session_close(Session *s) |
e78a59f5 | 2354 | { |
2ceb8101 | 2355 | u_int i; |
61a2c1da | 2356 | |
c457707e | 2357 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
2362db19 | 2358 | if (s->ttyfd != -1) |
86066315 | 2359 | session_pty_cleanup(s); |
e78a59f5 | 2360 | if (s->term) |
2361 | xfree(s->term); | |
2362 | if (s->display) | |
2363 | xfree(s->display); | |
d08341e6 | 2364 | if (s->x11_chanids) |
2365 | xfree(s->x11_chanids); | |
f9314d9a | 2366 | if (s->auth_display) |
2367 | xfree(s->auth_display); | |
e78a59f5 | 2368 | if (s->auth_data) |
2369 | xfree(s->auth_data); | |
2370 | if (s->auth_proto) | |
2371 | xfree(s->auth_proto); | |
2372 | s->used = 0; | |
0875ae22 | 2373 | if (s->env != NULL) { |
2374 | for (i = 0; i < s->num_env; i++) { | |
2375 | xfree(s->env[i].name); | |
2376 | xfree(s->env[i].val); | |
2377 | } | |
61a2c1da | 2378 | xfree(s->env); |
0875ae22 | 2379 | } |
1d1ffb87 | 2380 | session_proctitle(s); |
e78a59f5 | 2381 | } |
2382 | ||
2383 | void | |
2384 | session_close_by_pid(pid_t pid, int status) | |
2385 | { | |
2386 | Session *s = session_by_pid(pid); | |
2387 | if (s == NULL) { | |
c457707e | 2388 | debug("session_close_by_pid: no session for pid %ld", |
2389 | (long)pid); | |
e78a59f5 | 2390 | return; |
2391 | } | |
2392 | if (s->chanid != -1) | |
2393 | session_exit_message(s, status); | |
8cd0437d | 2394 | if (s->ttyfd != -1) |
2395 | session_pty_cleanup(s); | |
4c721c3d | 2396 | s->pid = 0; |
e78a59f5 | 2397 | } |
2398 | ||
2399 | /* | |
2400 | * this is called when a channel dies before | |
2401 | * the session 'child' itself dies | |
2402 | */ | |
2403 | void | |
2404 | session_close_by_channel(int id, void *arg) | |
2405 | { | |
2406 | Session *s = session_by_channel(id); | |
8cd0437d | 2407 | u_int i; |
d08341e6 | 2408 | |
e78a59f5 | 2409 | if (s == NULL) { |
418e724c | 2410 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 2411 | return; |
2412 | } | |
c457707e | 2413 | debug("session_close_by_channel: channel %d child %ld", |
2414 | id, (long)s->pid); | |
d5f24f94 | 2415 | if (s->pid != 0) { |
418e724c | 2416 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 2417 | /* |
2418 | * delay detach of session, but release pty, since | |
2419 | * the fd's to the child are already closed | |
2420 | */ | |
2362db19 | 2421 | if (s->ttyfd != -1) |
efcc9957 | 2422 | session_pty_cleanup(s); |
418e724c | 2423 | return; |
e78a59f5 | 2424 | } |
418e724c | 2425 | /* detach by removing callback */ |
2426 | channel_cancel_cleanup(s->chanid); | |
8cd0437d | 2427 | |
2428 | /* Close any X11 listeners associated with this session */ | |
2429 | if (s->x11_chanids != NULL) { | |
2430 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2431 | session_close_x11(s->x11_chanids[i]); | |
2432 | s->x11_chanids[i] = -1; | |
2433 | } | |
2434 | } | |
2435 | ||
418e724c | 2436 | s->chanid = -1; |
d5f24f94 | 2437 | session_close(s); |
2438 | } | |
2439 | ||
2440 | void | |
1853d1ef | 2441 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 2442 | { |
2443 | int i; | |
184eed6a | 2444 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 2445 | Session *s = &sessions[i]; |
1853d1ef | 2446 | if (s->used) { |
2447 | if (closefunc != NULL) | |
2448 | closefunc(s); | |
2449 | else | |
2450 | session_close(s); | |
2451 | } | |
d5f24f94 | 2452 | } |
e78a59f5 | 2453 | } |
2454 | ||
396c147e | 2455 | static char * |
1d1ffb87 | 2456 | session_tty_list(void) |
2457 | { | |
2458 | static char buf[1024]; | |
2459 | int i; | |
d0104542 | 2460 | char *cp; |
2461 | ||
1d1ffb87 | 2462 | buf[0] = '\0'; |
184eed6a | 2463 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 2464 | Session *s = &sessions[i]; |
2465 | if (s->used && s->ttyfd != -1) { | |
b6453d99 | 2466 | |
d0104542 | 2467 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2468 | cp = strrchr(s->tty, '/'); | |
2469 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2470 | } else | |
2471 | cp = s->tty + 5; | |
b6453d99 | 2472 | |
1d1ffb87 | 2473 | if (buf[0] != '\0') |
2474 | strlcat(buf, ",", sizeof buf); | |
d0104542 | 2475 | strlcat(buf, cp, sizeof buf); |
1d1ffb87 | 2476 | } |
2477 | } | |
2478 | if (buf[0] == '\0') | |
2479 | strlcpy(buf, "notty", sizeof buf); | |
2480 | return buf; | |
2481 | } | |
2482 | ||
2483 | void | |
2484 | session_proctitle(Session *s) | |
2485 | { | |
2486 | if (s->pw == NULL) | |
2487 | error("no user for session %d", s->self); | |
2488 | else | |
2489 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2490 | } | |
2491 | ||
8dcd9d5c | 2492 | int |
2493 | session_setup_x11fwd(Session *s) | |
2494 | { | |
8dcd9d5c | 2495 | struct stat st; |
c9d0ad9b | 2496 | char display[512], auth_display[512]; |
2497 | char hostname[MAXHOSTNAMELEN]; | |
d08341e6 | 2498 | u_int i; |
8dcd9d5c | 2499 | |
2500 | if (no_x11_forwarding_flag) { | |
2501 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2502 | return 0; | |
2503 | } | |
2504 | if (!options.x11_forwarding) { | |
2505 | debug("X11 forwarding disabled in server configuration file."); | |
2506 | return 0; | |
2507 | } | |
2508 | if (!options.xauth_location || | |
2509 | (stat(options.xauth_location, &st) == -1)) { | |
2510 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2511 | return 0; | |
2512 | } | |
ff027d84 | 2513 | if (options.use_login) { |
2514 | packet_send_debug("X11 forwarding disabled; " | |
2515 | "not compatible with UseLogin=yes."); | |
2516 | return 0; | |
2517 | } | |
b44de2b1 | 2518 | if (s->display != NULL) { |
8dcd9d5c | 2519 | debug("X11 display already set."); |
2520 | return 0; | |
2521 | } | |
57f228e8 | 2522 | if (x11_create_display_inet(options.x11_display_offset, |
2523 | options.x11_use_localhost, s->single_connection, | |
d08341e6 | 2524 | &s->display_number, &s->x11_chanids) == -1) { |
b44de2b1 | 2525 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 2526 | return 0; |
2527 | } | |
d08341e6 | 2528 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2529 | channel_register_cleanup(s->x11_chanids[i], | |
8cd0437d | 2530 | session_close_single_x11, 0); |
d08341e6 | 2531 | } |
c9d0ad9b | 2532 | |
2533 | /* Set up a suitable value for the DISPLAY variable. */ | |
2534 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2535 | fatal("gethostname: %.100s", strerror(errno)); | |
2536 | /* | |
2537 | * auth_display must be used as the displayname when the | |
2538 | * authorization entry is added with xauth(1). This will be | |
2539 | * different than the DISPLAY string for localhost displays. | |
2540 | */ | |
e6e573bd | 2541 | if (options.x11_use_localhost) { |
57f228e8 | 2542 | snprintf(display, sizeof display, "localhost:%u.%u", |
c9d0ad9b | 2543 | s->display_number, s->screen); |
57f228e8 | 2544 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
f9314d9a | 2545 | s->display_number, s->screen); |
c9d0ad9b | 2546 | s->display = xstrdup(display); |
f9314d9a | 2547 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 2548 | } else { |
2549 | #ifdef IPADDR_IN_DISPLAY | |
2550 | struct hostent *he; | |
2551 | struct in_addr my_addr; | |
2552 | ||
2553 | he = gethostbyname(hostname); | |
2554 | if (he == NULL) { | |
2555 | error("Can't get IP address for X11 DISPLAY."); | |
2556 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2557 | return 0; | |
2558 | } | |
2559 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
57f228e8 | 2560 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
c9d0ad9b | 2561 | s->display_number, s->screen); |
2562 | #else | |
57f228e8 | 2563 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
c9d0ad9b | 2564 | s->display_number, s->screen); |
2565 | #endif | |
2566 | s->display = xstrdup(display); | |
f9314d9a | 2567 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2568 | } |
2569 | ||
8dcd9d5c | 2570 | return 1; |
2571 | } | |
2572 | ||
396c147e | 2573 | static void |
59c97189 | 2574 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2575 | { |
57156994 | 2576 | server_loop2(authctxt); |
2362db19 | 2577 | } |
2578 | ||
2579 | void | |
2580 | do_cleanup(Authctxt *authctxt) | |
2581 | { | |
2582 | static int called = 0; | |
2583 | ||
2584 | debug("do_cleanup"); | |
2585 | ||
2586 | /* no cleanup if we're in the child for login shell */ | |
2587 | if (is_child) | |
2588 | return; | |
2589 | ||
2590 | /* avoid double cleanup */ | |
2591 | if (called) | |
2592 | return; | |
2593 | called = 1; | |
2594 | ||
8d5728b7 | 2595 | if (authctxt == NULL) |
2362db19 | 2596 | return; |
8d5728b7 | 2597 | |
2598 | #ifdef USE_PAM | |
2599 | if (options.use_pam) { | |
2600 | sshpam_cleanup(); | |
2601 | sshpam_thread_cleanup(); | |
2602 | } | |
2603 | #endif | |
2604 | ||
2605 | if (!authctxt->authenticated) | |
2606 | return; | |
2607 | ||
2362db19 | 2608 | #ifdef KRB5 |
2609 | if (options.kerberos_ticket_cleanup && | |
2610 | authctxt->krb5_ctx) | |
2611 | krb5_cleanup_proc(authctxt); | |
7364bd04 | 2612 | #endif |
2362db19 | 2613 | |
2614 | #ifdef GSSAPI | |
2615 | if (compat20 && options.gss_cleanup_creds) | |
2616 | ssh_gssapi_cleanup_creds(); | |
2617 | #endif | |
2618 | ||
2619 | /* remove agent socket */ | |
2620 | auth_sock_cleanup_proc(authctxt->pw); | |
2621 | ||
2622 | /* | |
2623 | * Cleanup ptys/utmp only if privsep is disabled, | |
2624 | * or if running in monitor. | |
2625 | */ | |
2626 | if (!use_privsep || mm_is_monitor()) | |
2627 | session_destroy_all(session_pty_cleanup2); | |
e78a59f5 | 2628 | } |