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c33ba17e | 1 | /* $OpenBSD: session.c,v 1.225 2008/02/04 21:53:00 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" | |
5ca51e19 | 87 | #include "session.h" |
07200973 | 88 | #include "kex.h" |
1853d1ef | 89 | #include "monitor_wrap.h" |
c33ba17e | 90 | #include "sftp.h" |
e78a59f5 | 91 | |
bcfcc5f9 | 92 | #if defined(KRB5) && defined(USE_AFS) |
39dfceeb | 93 | #include <kafs.h> |
94 | #endif | |
95 | ||
7368a6c8 | 96 | /* func */ |
97 | ||
98 | Session *session_new(void); | |
9c328529 | 99 | void session_set_fds(Session *, int, int, int); |
2362db19 | 100 | void session_pty_cleanup(Session *); |
9c328529 | 101 | void session_proctitle(Session *); |
102 | int session_setup_x11fwd(Session *); | |
103 | void do_exec_pty(Session *, const char *); | |
104 | void do_exec_no_pty(Session *, const char *); | |
105 | void do_exec(Session *, const char *); | |
106 | void do_login(Session *, const char *); | |
8a9ac95d | 107 | #ifdef LOGIN_NEEDS_UTMPX |
108 | static void do_pre_login(Session *s); | |
109 | #endif | |
9c328529 | 110 | void do_child(Session *, const char *); |
f2c2fd71 | 111 | void do_motd(void); |
9c328529 | 112 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 113 | |
396c147e | 114 | static void do_authenticated1(Authctxt *); |
115 | static void do_authenticated2(Authctxt *); | |
9c328529 | 116 | |
396c147e | 117 | static int session_pty_req(Session *); |
bb5639fe | 118 | |
7368a6c8 | 119 | /* import */ |
120 | extern ServerOptions options; | |
121 | extern char *__progname; | |
122 | extern int log_stderr; | |
123 | extern int debug_flag; | |
1e3b8b07 | 124 | extern u_int utmp_len; |
089fbbd2 | 125 | extern int startup_pipe; |
e78e738a | 126 | extern void destroy_sensitive_data(void); |
bc7dfc06 | 127 | extern Buffer loginmsg; |
089fbbd2 | 128 | |
b5e300c2 | 129 | /* original command from peer. */ |
c95add71 | 130 | const char *original_command = NULL; |
b5e300c2 | 131 | |
7368a6c8 | 132 | /* data */ |
133 | #define MAX_SESSIONS 10 | |
134 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 135 | |
c33ba17e | 136 | #define SUBSYSTEM_NONE 0 |
137 | #define SUBSYSTEM_EXT 1 | |
138 | #define SUBSYSTEM_INT_SFTP 2 | |
139 | ||
2e73a022 | 140 | #ifdef HAVE_LOGIN_CAP |
1836f69f | 141 | login_cap_t *lc; |
2e73a022 | 142 | #endif |
143 | ||
2362db19 | 144 | static int is_child = 0; |
145 | ||
149cdb60 | 146 | /* Name and directory of socket for authentication agent forwarding. */ |
147 | static char *auth_sock_name = NULL; | |
148 | static char *auth_sock_dir = NULL; | |
149 | ||
150 | /* removes the agent forwarding socket */ | |
151 | ||
152 | static void | |
2362db19 | 153 | auth_sock_cleanup_proc(struct passwd *pw) |
149cdb60 | 154 | { |
149cdb60 | 155 | if (auth_sock_name != NULL) { |
156 | temporarily_use_uid(pw); | |
157 | unlink(auth_sock_name); | |
158 | rmdir(auth_sock_dir); | |
159 | auth_sock_name = NULL; | |
160 | restore_uid(); | |
161 | } | |
162 | } | |
163 | ||
164 | static int | |
165 | auth_input_request_forwarding(struct passwd * pw) | |
166 | { | |
167 | Channel *nc; | |
168 | int sock; | |
169 | struct sockaddr_un sunaddr; | |
170 | ||
171 | if (auth_sock_name != NULL) { | |
172 | error("authentication forwarding requested twice."); | |
173 | return 0; | |
174 | } | |
175 | ||
176 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
177 | temporarily_use_uid(pw); | |
178 | ||
179 | /* Allocate a buffer for the socket name, and format the name. */ | |
180 | auth_sock_name = xmalloc(MAXPATHLEN); | |
181 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
c88de854 | 182 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
149cdb60 | 183 | |
184 | /* Create private directory for socket */ | |
185 | if (mkdtemp(auth_sock_dir) == NULL) { | |
186 | packet_send_debug("Agent forwarding disabled: " | |
187 | "mkdtemp() failed: %.100s", strerror(errno)); | |
188 | restore_uid(); | |
189 | xfree(auth_sock_name); | |
190 | xfree(auth_sock_dir); | |
191 | auth_sock_name = NULL; | |
192 | auth_sock_dir = NULL; | |
193 | return 0; | |
194 | } | |
c457707e | 195 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
196 | auth_sock_dir, (long) getpid()); | |
149cdb60 | 197 | |
149cdb60 | 198 | /* Create the socket. */ |
199 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
200 | if (sock < 0) | |
201 | packet_disconnect("socket: %.100s", strerror(errno)); | |
202 | ||
203 | /* Bind it to the name. */ | |
204 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
205 | sunaddr.sun_family = AF_UNIX; | |
206 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
207 | ||
32596c7b | 208 | if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) |
149cdb60 | 209 | packet_disconnect("bind: %.100s", strerror(errno)); |
210 | ||
211 | /* Restore the privileged uid. */ | |
212 | restore_uid(); | |
213 | ||
214 | /* Start listening on the socket. */ | |
fce39749 | 215 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
149cdb60 | 216 | packet_disconnect("listen: %.100s", strerror(errno)); |
217 | ||
218 | /* Allocate a channel for the authentication agent socket. */ | |
219 | nc = channel_new("auth socket", | |
220 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
221 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 222 | 0, "auth socket", 1); |
149cdb60 | 223 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
224 | return 1; | |
225 | } | |
226 | ||
dd1fb864 | 227 | static void |
228 | display_loginmsg(void) | |
229 | { | |
56964485 | 230 | if (buffer_len(&loginmsg) > 0) { |
231 | buffer_append(&loginmsg, "\0", 1); | |
232 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
233 | buffer_clear(&loginmsg); | |
234 | } | |
dd1fb864 | 235 | } |
149cdb60 | 236 | |
bb5639fe | 237 | void |
238 | do_authenticated(Authctxt *authctxt) | |
239 | { | |
381b021b | 240 | setproctitle("%s", authctxt->pw->pw_name); |
241 | ||
bb5639fe | 242 | /* setup the channel layer */ |
243 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
244 | channel_permit_all_opens(); | |
245 | ||
246 | if (compat20) | |
247 | do_authenticated2(authctxt); | |
248 | else | |
249 | do_authenticated1(authctxt); | |
e4f7282d | 250 | |
2362db19 | 251 | do_cleanup(authctxt); |
bb5639fe | 252 | } |
253 | ||
7368a6c8 | 254 | /* |
255 | * Prepares for an interactive session. This is called after the user has | |
256 | * been successfully authenticated. During this message exchange, pseudo | |
257 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
258 | * are requested, etc. | |
259 | */ | |
396c147e | 260 | static void |
bb5639fe | 261 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 262 | { |
263 | Session *s; | |
7368a6c8 | 264 | char *command; |
54a5250f | 265 | int success, type, screen_flag; |
7138ebd9 | 266 | int enable_compression_after_reply = 0; |
267 | u_int proto_len, data_len, dlen, compression_level = 0; | |
7368a6c8 | 268 | |
269 | s = session_new(); | |
b0042027 | 270 | if (s == NULL) { |
271 | error("no more sessions"); | |
272 | return; | |
273 | } | |
ced49be2 | 274 | s->authctxt = authctxt; |
bb5639fe | 275 | s->pw = authctxt->pw; |
2e73a022 | 276 | |
7368a6c8 | 277 | /* |
278 | * We stay in this loop until the client requests to execute a shell | |
279 | * or a command. | |
280 | */ | |
281 | for (;;) { | |
bb5639fe | 282 | success = 0; |
7368a6c8 | 283 | |
284 | /* Get a packet from the client. */ | |
54a5250f | 285 | type = packet_read(); |
7368a6c8 | 286 | |
287 | /* Process the packet. */ | |
288 | switch (type) { | |
289 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 290 | compression_level = packet_get_int(); |
95500969 | 291 | packet_check_eom(); |
7368a6c8 | 292 | if (compression_level < 1 || compression_level > 9) { |
d77347cc | 293 | packet_send_debug("Received invalid compression level %d.", |
184eed6a | 294 | compression_level); |
7368a6c8 | 295 | break; |
296 | } | |
07200973 | 297 | if (options.compression == COMP_NONE) { |
636f76ca | 298 | debug2("compression disabled"); |
299 | break; | |
300 | } | |
7368a6c8 | 301 | /* Enable compression after we have responded with SUCCESS. */ |
302 | enable_compression_after_reply = 1; | |
303 | success = 1; | |
304 | break; | |
305 | ||
306 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 307 | success = session_pty_req(s); |
7368a6c8 | 308 | break; |
309 | ||
310 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 311 | s->auth_proto = packet_get_string(&proto_len); |
312 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 313 | |
2af09193 | 314 | screen_flag = packet_get_protocol_flags() & |
315 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
316 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
317 | ||
318 | if (packet_remaining() == 4) { | |
319 | if (!screen_flag) | |
320 | debug2("Buggy client: " | |
321 | "X11 screen flag missing"); | |
7368a6c8 | 322 | s->screen = packet_get_int(); |
c8b058b4 | 323 | } else { |
7368a6c8 | 324 | s->screen = 0; |
c8b058b4 | 325 | } |
95500969 | 326 | packet_check_eom(); |
8dcd9d5c | 327 | success = session_setup_x11fwd(s); |
328 | if (!success) { | |
329 | xfree(s->auth_proto); | |
330 | xfree(s->auth_data); | |
1500bcdd | 331 | s->auth_proto = NULL; |
332 | s->auth_data = NULL; | |
7368a6c8 | 333 | } |
7368a6c8 | 334 | break; |
7368a6c8 | 335 | |
336 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
337 | if (no_agent_forwarding_flag || compat13) { | |
338 | debug("Authentication agent forwarding not permitted for this authentication."); | |
339 | break; | |
340 | } | |
341 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 342 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 343 | break; |
344 | ||
345 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
346 | if (no_port_forwarding_flag) { | |
347 | debug("Port forwarding not permitted for this authentication."); | |
348 | break; | |
349 | } | |
33de75a3 | 350 | if (!options.allow_tcp_forwarding) { |
351 | debug("Port forwarding not permitted."); | |
352 | break; | |
353 | } | |
7368a6c8 | 354 | debug("Received TCP/IP port forwarding request."); |
42ea6f5e | 355 | if (channel_input_port_forward_request(s->pw->pw_uid == 0, |
356 | options.gateway_ports) < 0) { | |
357 | debug("Port forwarding failed."); | |
358 | break; | |
359 | } | |
7368a6c8 | 360 | success = 1; |
361 | break; | |
362 | ||
363 | case SSH_CMSG_MAX_PACKET_SIZE: | |
364 | if (packet_set_maxsize(packet_get_int()) > 0) | |
365 | success = 1; | |
366 | break; | |
184eed6a | 367 | |
7368a6c8 | 368 | case SSH_CMSG_EXEC_SHELL: |
369 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 370 | if (type == SSH_CMSG_EXEC_CMD) { |
371 | command = packet_get_string(&dlen); | |
372 | debug("Exec command '%.500s'", command); | |
c95add71 | 373 | do_exec(s, command); |
374 | xfree(command); | |
7368a6c8 | 375 | } else { |
c95add71 | 376 | do_exec(s, NULL); |
7368a6c8 | 377 | } |
95500969 | 378 | packet_check_eom(); |
fc2a1d28 | 379 | session_close(s); |
7368a6c8 | 380 | return; |
381 | ||
382 | default: | |
383 | /* | |
384 | * Any unknown messages in this phase are ignored, | |
385 | * and a failure message is returned. | |
386 | */ | |
bbe88b6d | 387 | logit("Unknown packet type received after authentication: %d", type); |
7368a6c8 | 388 | } |
389 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
390 | packet_send(); | |
391 | packet_write_wait(); | |
392 | ||
393 | /* Enable compression now that we have replied if appropriate. */ | |
394 | if (enable_compression_after_reply) { | |
395 | enable_compression_after_reply = 0; | |
396 | packet_start_compression(compression_level); | |
397 | } | |
398 | } | |
399 | } | |
400 | ||
401 | /* | |
402 | * This is called to fork and execute a command when we have no tty. This | |
403 | * will call do_child from the child, and server_loop from the parent after | |
404 | * setting up file descriptors and such. | |
405 | */ | |
6ae2364d | 406 | void |
65068d16 | 407 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 408 | { |
c457707e | 409 | pid_t pid; |
7368a6c8 | 410 | |
411 | #ifdef USE_PIPES | |
412 | int pin[2], pout[2], perr[2]; | |
413 | /* Allocate pipes for communicating with the program. */ | |
414 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
415 | packet_disconnect("Could not create pipes: %.100s", | |
416 | strerror(errno)); | |
417 | #else /* USE_PIPES */ | |
418 | int inout[2], err[2]; | |
419 | /* Uses socket pairs to communicate with the program. */ | |
420 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
421 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
422 | packet_disconnect("Could not create socket pairs: %.100s", | |
423 | strerror(errno)); | |
424 | #endif /* USE_PIPES */ | |
425 | if (s == NULL) | |
426 | fatal("do_exec_no_pty: no session"); | |
427 | ||
1d1ffb87 | 428 | session_proctitle(s); |
7368a6c8 | 429 | |
b19d61d7 | 430 | #if defined(USE_PAM) |
59f327e0 | 431 | if (options.use_pam && !use_privsep) |
7fceb20d | 432 | do_pam_setcred(1); |
266140a8 | 433 | #endif /* USE_PAM */ |
434 | ||
7368a6c8 | 435 | /* Fork the child. */ |
436 | if ((pid = fork()) == 0) { | |
2362db19 | 437 | is_child = 1; |
516f0d7d | 438 | |
7368a6c8 | 439 | /* Child. Reinitialize the log since the pid has changed. */ |
440 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
441 | ||
442 | /* | |
443 | * Create a new session and process group since the 4.4BSD | |
444 | * setlogin() affects the entire process group. | |
445 | */ | |
446 | if (setsid() < 0) | |
447 | error("setsid failed: %.100s", strerror(errno)); | |
448 | ||
449 | #ifdef USE_PIPES | |
450 | /* | |
451 | * Redirect stdin. We close the parent side of the socket | |
452 | * pair, and make the child side the standard input. | |
453 | */ | |
454 | close(pin[1]); | |
455 | if (dup2(pin[0], 0) < 0) | |
456 | perror("dup2 stdin"); | |
457 | close(pin[0]); | |
458 | ||
459 | /* Redirect stdout. */ | |
460 | close(pout[0]); | |
461 | if (dup2(pout[1], 1) < 0) | |
462 | perror("dup2 stdout"); | |
463 | close(pout[1]); | |
464 | ||
465 | /* Redirect stderr. */ | |
466 | close(perr[0]); | |
467 | if (dup2(perr[1], 2) < 0) | |
468 | perror("dup2 stderr"); | |
469 | close(perr[1]); | |
470 | #else /* USE_PIPES */ | |
471 | /* | |
472 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
473 | * use the same socket, as some programs (particularly rdist) | |
474 | * seem to depend on it. | |
475 | */ | |
476 | close(inout[1]); | |
477 | close(err[1]); | |
478 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
479 | perror("dup2 stdin"); | |
480 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
481 | perror("dup2 stdout"); | |
482 | if (dup2(err[0], 2) < 0) /* stderr */ | |
483 | perror("dup2 stderr"); | |
484 | #endif /* USE_PIPES */ | |
485 | ||
ef51930f | 486 | #ifdef _UNICOS |
487 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
488 | #endif | |
489 | ||
7368a6c8 | 490 | /* Do processing for the child (exec command etc). */ |
56b3e9ce | 491 | do_child(s, command); |
7368a6c8 | 492 | /* NOTREACHED */ |
493 | } | |
ef51930f | 494 | #ifdef _UNICOS |
495 | signal(WJSIGNAL, cray_job_termination_handler); | |
496 | #endif /* _UNICOS */ | |
3c62e7eb | 497 | #ifdef HAVE_CYGWIN |
498 | if (is_winnt) | |
499 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
500 | #endif | |
7368a6c8 | 501 | if (pid < 0) |
502 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
503 | s->pid = pid; | |
b5c334cc | 504 | /* Set interactive/non-interactive mode. */ |
505 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 506 | #ifdef USE_PIPES |
507 | /* We are the parent. Close the child sides of the pipes. */ | |
508 | close(pin[0]); | |
509 | close(pout[1]); | |
510 | close(perr[1]); | |
511 | ||
e78a59f5 | 512 | if (compat20) { |
d7ecbe88 | 513 | if (s->is_subsystem) { |
514 | close(perr[0]); | |
515 | perr[0] = -1; | |
516 | } | |
517 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
e78a59f5 | 518 | } else { |
519 | /* Enter the interactive session. */ | |
520 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 521 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 522 | } |
7368a6c8 | 523 | #else /* USE_PIPES */ |
524 | /* We are the parent. Close the child sides of the socket pairs. */ | |
525 | close(inout[0]); | |
526 | close(err[0]); | |
527 | ||
75dbfa01 | 528 | /* |
529 | * Clear loginmsg, since it's the child's responsibility to display | |
530 | * it to the user, otherwise multiple sessions may accumulate | |
531 | * multiple copies of the login messages. | |
532 | */ | |
533 | buffer_clear(&loginmsg); | |
534 | ||
7368a6c8 | 535 | /* |
536 | * Enter the interactive session. Note: server_loop must be able to | |
537 | * handle the case that fdin and fdout are the same. | |
538 | */ | |
e78a59f5 | 539 | if (compat20) { |
e5d7a405 | 540 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 541 | } else { |
542 | server_loop(pid, inout[1], inout[1], err[1]); | |
543 | /* server_loop has closed inout[1] and err[1]. */ | |
544 | } | |
7368a6c8 | 545 | #endif /* USE_PIPES */ |
546 | } | |
547 | ||
548 | /* | |
549 | * This is called to fork and execute a command when we have a tty. This | |
550 | * will call do_child from the child, and server_loop from the parent after | |
551 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
552 | * lastlog, and other such operations. | |
553 | */ | |
6ae2364d | 554 | void |
65068d16 | 555 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 556 | { |
7368a6c8 | 557 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 558 | pid_t pid; |
7368a6c8 | 559 | |
560 | if (s == NULL) | |
561 | fatal("do_exec_pty: no session"); | |
562 | ptyfd = s->ptyfd; | |
563 | ttyfd = s->ttyfd; | |
564 | ||
b19d61d7 | 565 | #if defined(USE_PAM) |
7fceb20d | 566 | if (options.use_pam) { |
49e82bb9 | 567 | do_pam_set_tty(s->tty); |
72037bc8 | 568 | if (!use_privsep) |
569 | do_pam_setcred(1); | |
7fceb20d | 570 | } |
27cf96de | 571 | #endif |
266140a8 | 572 | |
7368a6c8 | 573 | /* Fork the child. */ |
574 | if ((pid = fork()) == 0) { | |
2362db19 | 575 | is_child = 1; |
57156994 | 576 | |
c345cf9d | 577 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 578 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 579 | /* Close the master side of the pseudo tty. */ |
580 | close(ptyfd); | |
581 | ||
582 | /* Make the pseudo tty our controlling tty. */ | |
583 | pty_make_controlling_tty(&ttyfd, s->tty); | |
584 | ||
05fd093c | 585 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
586 | if (dup2(ttyfd, 0) < 0) | |
587 | error("dup2 stdin: %s", strerror(errno)); | |
588 | if (dup2(ttyfd, 1) < 0) | |
589 | error("dup2 stdout: %s", strerror(errno)); | |
590 | if (dup2(ttyfd, 2) < 0) | |
591 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 592 | |
593 | /* Close the extra descriptor for the pseudo tty. */ | |
594 | close(ttyfd); | |
595 | ||
c345cf9d | 596 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 597 | #ifndef HAVE_OSF_SIA |
ef51930f | 598 | if (!(options.use_login && command == NULL)) { |
599 | #ifdef _UNICOS | |
600 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
601 | #endif /* _UNICOS */ | |
a22aff1f | 602 | do_login(s, command); |
ef51930f | 603 | } |
7e2d5fa4 | 604 | # ifdef LOGIN_NEEDS_UTMPX |
605 | else | |
606 | do_pre_login(s); | |
607 | # endif | |
c96a4aaf | 608 | #endif |
7368a6c8 | 609 | |
7368a6c8 | 610 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 611 | do_child(s, command); |
7368a6c8 | 612 | /* NOTREACHED */ |
613 | } | |
ef51930f | 614 | #ifdef _UNICOS |
615 | signal(WJSIGNAL, cray_job_termination_handler); | |
616 | #endif /* _UNICOS */ | |
3c62e7eb | 617 | #ifdef HAVE_CYGWIN |
618 | if (is_winnt) | |
619 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
620 | #endif | |
7368a6c8 | 621 | if (pid < 0) |
622 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
623 | s->pid = pid; | |
624 | ||
625 | /* Parent. Close the slave side of the pseudo tty. */ | |
626 | close(ttyfd); | |
627 | ||
628 | /* | |
629 | * Create another descriptor of the pty master side for use as the | |
630 | * standard input. We could use the original descriptor, but this | |
631 | * simplifies code in server_loop. The descriptor is bidirectional. | |
632 | */ | |
633 | fdout = dup(ptyfd); | |
634 | if (fdout < 0) | |
635 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
636 | ||
637 | /* we keep a reference to the pty master */ | |
638 | ptymaster = dup(ptyfd); | |
639 | if (ptymaster < 0) | |
640 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
641 | s->ptymaster = ptymaster; | |
642 | ||
643 | /* Enter interactive session. */ | |
b5c334cc | 644 | packet_set_interactive(1); |
e78a59f5 | 645 | if (compat20) { |
646 | session_set_fds(s, ptyfd, fdout, -1); | |
647 | } else { | |
648 | server_loop(pid, ptyfd, fdout, -1); | |
649 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 650 | } |
7368a6c8 | 651 | } |
652 | ||
7e2d5fa4 | 653 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 654 | static void |
7e2d5fa4 | 655 | do_pre_login(Session *s) |
656 | { | |
657 | socklen_t fromlen; | |
658 | struct sockaddr_storage from; | |
659 | pid_t pid = getpid(); | |
660 | ||
661 | /* | |
662 | * Get IP address of client. If the connection is not a socket, let | |
663 | * the address be 0.0.0.0. | |
664 | */ | |
665 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 666 | fromlen = sizeof(from); |
7e2d5fa4 | 667 | if (packet_connection_is_on_socket()) { |
7e2d5fa4 | 668 | if (getpeername(packet_get_connection_in(), |
32596c7b | 669 | (struct sockaddr *)&from, &fromlen) < 0) { |
7e2d5fa4 | 670 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 671 | cleanup_exit(255); |
7e2d5fa4 | 672 | } |
673 | } | |
674 | ||
675 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
c5a7d788 | 676 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d4ac26ed | 677 | (struct sockaddr *)&from, fromlen); |
7e2d5fa4 | 678 | } |
679 | #endif | |
680 | ||
dac6753b | 681 | /* |
682 | * This is called to fork and execute a command. If another command is | |
683 | * to be forced, execute that instead. | |
684 | */ | |
685 | void | |
686 | do_exec(Session *s, const char *command) | |
687 | { | |
e7259e8d | 688 | if (options.adm_forced_command) { |
689 | original_command = command; | |
690 | command = options.adm_forced_command; | |
c33ba17e | 691 | if (s->is_subsystem) |
692 | s->is_subsystem = SUBSYSTEM_EXT; | |
e7259e8d | 693 | debug("Forced command (config) '%.900s'", command); |
694 | } else if (forced_command) { | |
dac6753b | 695 | original_command = command; |
696 | command = forced_command; | |
c33ba17e | 697 | if (s->is_subsystem) |
698 | s->is_subsystem = SUBSYSTEM_EXT; | |
e7259e8d | 699 | debug("Forced command (key option) '%.900s'", command); |
dac6753b | 700 | } |
701 | ||
6039eeef | 702 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 703 | if (command != NULL) |
704 | PRIVSEP(audit_run_command(command)); | |
705 | else if (s->ttyfd == -1) { | |
706 | char *shell = s->pw->pw_shell; | |
707 | ||
708 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
709 | shell =_PATH_BSHELL; | |
710 | PRIVSEP(audit_run_command(shell)); | |
711 | } | |
712 | #endif | |
713 | ||
dac6753b | 714 | if (s->ttyfd != -1) |
715 | do_exec_pty(s, command); | |
716 | else | |
717 | do_exec_no_pty(s, command); | |
718 | ||
c95add71 | 719 | original_command = NULL; |
dac6753b | 720 | |
be2ca0c9 | 721 | /* |
722 | * Clear loginmsg: it's the child's responsibility to display | |
723 | * it to the user, otherwise multiple sessions may accumulate | |
724 | * multiple copies of the login messages. | |
725 | */ | |
726 | buffer_clear(&loginmsg); | |
727 | } | |
f7342052 | 728 | |
c345cf9d | 729 | /* administrative, login(1)-like work */ |
730 | void | |
a22aff1f | 731 | do_login(Session *s, const char *command) |
c345cf9d | 732 | { |
c345cf9d | 733 | socklen_t fromlen; |
734 | struct sockaddr_storage from; | |
c345cf9d | 735 | struct passwd * pw = s->pw; |
736 | pid_t pid = getpid(); | |
737 | ||
738 | /* | |
739 | * Get IP address of client. If the connection is not a socket, let | |
740 | * the address be 0.0.0.0. | |
741 | */ | |
742 | memset(&from, 0, sizeof(from)); | |
d4ac26ed | 743 | fromlen = sizeof(from); |
c345cf9d | 744 | if (packet_connection_is_on_socket()) { |
c345cf9d | 745 | if (getpeername(packet_get_connection_in(), |
f7342052 | 746 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 747 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 748 | cleanup_exit(255); |
c345cf9d | 749 | } |
750 | } | |
751 | ||
752 | /* Record that there was a login on that tty from the remote host. */ | |
49a34e84 | 753 | if (!use_privsep) |
754 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
755 | get_remote_name_or_ip(utmp_len, | |
c5a7d788 | 756 | options.use_dns), |
ba1566dd | 757 | (struct sockaddr *)&from, fromlen); |
c345cf9d | 758 | |
2919e060 | 759 | #ifdef USE_PAM |
760 | /* | |
761 | * If password change is needed, do it now. | |
762 | * This needs to occur before the ~/.hushlogin check. | |
763 | */ | |
dd1fb864 | 764 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
765 | display_loginmsg(); | |
2919e060 | 766 | do_pam_chauthtok(); |
dd1fb864 | 767 | s->authctxt->force_pwchange = 0; |
5b9e2464 | 768 | /* XXX - signal [net] parent to enable forwardings */ |
2919e060 | 769 | } |
770 | #endif | |
771 | ||
f2c2fd71 | 772 | if (check_quietlogin(s, command)) |
c345cf9d | 773 | return; |
774 | ||
dd1fb864 | 775 | display_loginmsg(); |
c345cf9d | 776 | |
f2c2fd71 | 777 | do_motd(); |
778 | } | |
779 | ||
780 | /* | |
781 | * Display the message of the day. | |
782 | */ | |
783 | void | |
784 | do_motd(void) | |
785 | { | |
786 | FILE *f; | |
787 | char buf[256]; | |
788 | ||
c345cf9d | 789 | if (options.print_motd) { |
2e73a022 | 790 | #ifdef HAVE_LOGIN_CAP |
791 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
792 | "/etc/motd"), "r"); | |
793 | #else | |
c345cf9d | 794 | f = fopen("/etc/motd", "r"); |
2e73a022 | 795 | #endif |
c345cf9d | 796 | if (f) { |
797 | while (fgets(buf, sizeof(buf), f)) | |
798 | fputs(buf, stdout); | |
799 | fclose(f); | |
800 | } | |
801 | } | |
802 | } | |
803 | ||
9c328529 | 804 | |
805 | /* | |
806 | * Check for quiet login, either .hushlogin or command given. | |
807 | */ | |
808 | int | |
809 | check_quietlogin(Session *s, const char *command) | |
810 | { | |
811 | char buf[256]; | |
812 | struct passwd *pw = s->pw; | |
813 | struct stat st; | |
814 | ||
815 | /* Return 1 if .hushlogin exists or a command given. */ | |
816 | if (command != NULL) | |
817 | return 1; | |
818 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
819 | #ifdef HAVE_LOGIN_CAP | |
820 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
821 | return 1; | |
822 | #else | |
823 | if (stat(buf, &st) >= 0) | |
824 | return 1; | |
825 | #endif | |
826 | return 0; | |
827 | } | |
828 | ||
7368a6c8 | 829 | /* |
830 | * Sets the value of the given variable in the environment. If the variable | |
831 | * already exists, its value is overriden. | |
832 | */ | |
7364bd04 | 833 | void |
1e3b8b07 | 834 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
184eed6a | 835 | const char *value) |
7368a6c8 | 836 | { |
7368a6c8 | 837 | char **env; |
c46e584f | 838 | u_int envsize; |
839 | u_int i, namelen; | |
7368a6c8 | 840 | |
95b99395 | 841 | /* |
842 | * If we're passed an uninitialized list, allocate a single null | |
843 | * entry before continuing. | |
844 | */ | |
845 | if (*envp == NULL && *envsizep == 0) { | |
846 | *envp = xmalloc(sizeof(char *)); | |
847 | *envp[0] = NULL; | |
848 | *envsizep = 1; | |
849 | } | |
850 | ||
7368a6c8 | 851 | /* |
852 | * Find the slot where the value should be stored. If the variable | |
853 | * already exists, we reuse the slot; otherwise we append a new slot | |
854 | * at the end of the array, expanding if necessary. | |
855 | */ | |
856 | env = *envp; | |
857 | namelen = strlen(name); | |
858 | for (i = 0; env[i]; i++) | |
859 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
860 | break; | |
861 | if (env[i]) { | |
862 | /* Reuse the slot. */ | |
863 | xfree(env[i]); | |
864 | } else { | |
865 | /* New variable. Expand if necessary. */ | |
c46e584f | 866 | envsize = *envsizep; |
867 | if (i >= envsize - 1) { | |
868 | if (envsize >= 1000) | |
869 | fatal("child_set_env: too many env vars"); | |
870 | envsize += 50; | |
c5d10563 | 871 | env = (*envp) = xrealloc(env, envsize, sizeof(char *)); |
c46e584f | 872 | *envsizep = envsize; |
7368a6c8 | 873 | } |
874 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
875 | env[i + 1] = NULL; | |
876 | } | |
877 | ||
878 | /* Allocate space and format the variable in the appropriate slot. */ | |
879 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
880 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
881 | } | |
882 | ||
883 | /* | |
884 | * Reads environment variables from the given file and adds/overrides them | |
885 | * into the environment. If the file does not exist, this does nothing. | |
886 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
887 | * and assignments of the form name=value. No other forms are allowed. | |
888 | */ | |
396c147e | 889 | static void |
1e3b8b07 | 890 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 891 | const char *filename) |
7368a6c8 | 892 | { |
893 | FILE *f; | |
894 | char buf[4096]; | |
895 | char *cp, *value; | |
66087567 | 896 | u_int lineno = 0; |
7368a6c8 | 897 | |
898 | f = fopen(filename, "r"); | |
899 | if (!f) | |
900 | return; | |
901 | ||
902 | while (fgets(buf, sizeof(buf), f)) { | |
66087567 | 903 | if (++lineno > 1000) |
904 | fatal("Too many lines in environment file %s", filename); | |
7368a6c8 | 905 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
906 | ; | |
907 | if (!*cp || *cp == '#' || *cp == '\n') | |
908 | continue; | |
b05117ac | 909 | |
910 | cp[strcspn(cp, "\n")] = '\0'; | |
911 | ||
7368a6c8 | 912 | value = strchr(cp, '='); |
913 | if (value == NULL) { | |
66087567 | 914 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
915 | filename); | |
7368a6c8 | 916 | continue; |
917 | } | |
71276795 | 918 | /* |
919 | * Replace the equals sign by nul, and advance value to | |
920 | * the value string. | |
921 | */ | |
7368a6c8 | 922 | *value = '\0'; |
923 | value++; | |
924 | child_set_env(env, envsize, cp, value); | |
925 | } | |
926 | fclose(f); | |
927 | } | |
928 | ||
95b99395 | 929 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
930 | /* | |
931 | * Return named variable from specified environment, or NULL if not present. | |
932 | */ | |
933 | static char * | |
934 | child_get_env(char **env, const char *name) | |
935 | { | |
936 | int i; | |
937 | size_t len; | |
938 | ||
939 | len = strlen(name); | |
940 | for (i=0; env[i] != NULL; i++) | |
941 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
942 | return(env[i] + len + 1); | |
943 | return NULL; | |
944 | } | |
945 | ||
946 | /* | |
947 | * Read /etc/default/login. | |
948 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
949 | */ | |
950 | static void | |
951 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
952 | { | |
953 | char **tmpenv = NULL, *var; | |
6f99680f | 954 | u_int i, tmpenvsize = 0; |
3a23ba0e | 955 | u_long mask; |
95b99395 | 956 | |
957 | /* | |
958 | * We don't want to copy the whole file to the child's environment, | |
959 | * so we use a temporary environment and copy the variables we're | |
960 | * interested in. | |
961 | */ | |
962 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
963 | ||
6f99680f | 964 | if (tmpenv == NULL) |
965 | return; | |
966 | ||
95b99395 | 967 | if (uid == 0) |
968 | var = child_get_env(tmpenv, "SUPATH"); | |
969 | else | |
970 | var = child_get_env(tmpenv, "PATH"); | |
971 | if (var != NULL) | |
972 | child_set_env(env, envsize, "PATH", var); | |
b6453d99 | 973 | |
95b99395 | 974 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
975 | if (sscanf(var, "%5lo", &mask) == 1) | |
3a23ba0e | 976 | umask((mode_t)mask); |
b6453d99 | 977 | |
95b99395 | 978 | for (i = 0; tmpenv[i] != NULL; i++) |
979 | xfree(tmpenv[i]); | |
980 | xfree(tmpenv); | |
981 | } | |
982 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
983 | ||
1db07e7d | 984 | void |
985 | copy_environment(char **source, char ***env, u_int *envsize) | |
7368a6c8 | 986 | { |
760b35a6 | 987 | char *var_name, *var_val; |
7368a6c8 | 988 | int i; |
989 | ||
760b35a6 | 990 | if (source == NULL) |
7368a6c8 | 991 | return; |
2b87da3b | 992 | |
760b35a6 | 993 | for(i = 0; source[i] != NULL; i++) { |
994 | var_name = xstrdup(source[i]); | |
995 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
996 | xfree(var_name); | |
7368a6c8 | 997 | continue; |
7368a6c8 | 998 | } |
760b35a6 | 999 | *var_val++ = '\0'; |
7368a6c8 | 1000 | |
760b35a6 | 1001 | debug3("Copy environment: %s=%s", var_name, var_val); |
1002 | child_set_env(env, envsize, var_name, var_val); | |
b6453d99 | 1003 | |
760b35a6 | 1004 | xfree(var_name); |
22d89d24 | 1005 | } |
1006 | } | |
22d89d24 | 1007 | |
f7342052 | 1008 | static char ** |
1009 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 1010 | { |
7368a6c8 | 1011 | char buf[256]; |
f7342052 | 1012 | u_int i, envsize; |
9b09381d | 1013 | char **env, *laddr; |
f7342052 | 1014 | struct passwd *pw = s->pw; |
9b09381d | 1015 | #ifndef HAVE_LOGIN_CAP |
1016 | char *path = NULL; | |
1017 | #endif | |
7368a6c8 | 1018 | |
7368a6c8 | 1019 | /* Initialize the environment. */ |
1020 | envsize = 100; | |
01d35895 | 1021 | env = xcalloc(envsize, sizeof(char *)); |
7368a6c8 | 1022 | env[0] = NULL; |
1023 | ||
3c62e7eb | 1024 | #ifdef HAVE_CYGWIN |
1025 | /* | |
1026 | * The Windows environment contains some setting which are | |
1027 | * important for a running system. They must not be dropped. | |
1028 | */ | |
3c502155 | 1029 | { |
1030 | char **p; | |
1031 | ||
1032 | p = fetch_windows_environment(); | |
1033 | copy_environment(p, &env, &envsize); | |
1034 | free_windows_environment(p); | |
1035 | } | |
3c62e7eb | 1036 | #endif |
1037 | ||
7364bd04 | 1038 | #ifdef GSSAPI |
aff51935 | 1039 | /* Allow any GSSAPI methods that we've used to alter |
7364bd04 | 1040 | * the childs environment as they see fit |
1041 | */ | |
1042 | ssh_gssapi_do_child(&env, &envsize); | |
1043 | #endif | |
1044 | ||
7368a6c8 | 1045 | if (!options.use_login) { |
1046 | /* Set basic environment. */ | |
61a2c1da | 1047 | for (i = 0; i < s->num_env; i++) |
f2107e97 | 1048 | child_set_env(&env, &envsize, s->env[i].name, |
61a2c1da | 1049 | s->env[i].val); |
1050 | ||
7368a6c8 | 1051 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1052 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
17ed08c5 | 1053 | #ifdef _AIX |
1054 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1055 | #endif | |
7368a6c8 | 1056 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
2e73a022 | 1057 | #ifdef HAVE_LOGIN_CAP |
97686bf9 | 1058 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1059 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1060 | else | |
1061 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1062 | #else /* HAVE_LOGIN_CAP */ |
1063 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1064 | /* |
1065 | * There's no standard path on Windows. The path contains | |
1066 | * important components pointing to the system directories, | |
1067 | * needed for loading shared libraries. So the path better | |
1068 | * remains intact here. | |
1069 | */ | |
95b99395 | 1070 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1071 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1072 | path = child_get_env(env, "PATH"); | |
1073 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1074 | if (path == NULL || *path == '\0') { | |
aff51935 | 1075 | child_set_env(&env, &envsize, "PATH", |
95b99395 | 1076 | s->pw->pw_uid == 0 ? |
1077 | SUPERUSER_PATH : _PATH_STDPATH); | |
1078 | } | |
22d89d24 | 1079 | # endif /* HAVE_CYGWIN */ |
1080 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1081 | |
1082 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1083 | _PATH_MAILDIR, pw->pw_name); | |
1084 | child_set_env(&env, &envsize, "MAIL", buf); | |
1085 | ||
1086 | /* Normal systems set SHELL by default. */ | |
1087 | child_set_env(&env, &envsize, "SHELL", shell); | |
1088 | } | |
1089 | if (getenv("TZ")) | |
1090 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1091 | ||
1092 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 1093 | if (!options.use_login) { |
1094 | while (custom_environment) { | |
1095 | struct envstring *ce = custom_environment; | |
7fdc56c5 | 1096 | char *str = ce->s; |
f7342052 | 1097 | |
7fdc56c5 | 1098 | for (i = 0; str[i] != '=' && str[i]; i++) |
2548961d | 1099 | ; |
7fdc56c5 | 1100 | if (str[i] == '=') { |
1101 | str[i] = 0; | |
1102 | child_set_env(&env, &envsize, str, str + i + 1); | |
2548961d | 1103 | } |
1104 | custom_environment = ce->next; | |
1105 | xfree(ce->s); | |
1106 | xfree(ce); | |
7368a6c8 | 1107 | } |
7368a6c8 | 1108 | } |
1109 | ||
da0561eb | 1110 | /* SSH_CLIENT deprecated */ |
7368a6c8 | 1111 | snprintf(buf, sizeof buf, "%.50s %d %d", |
f7342052 | 1112 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1113 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1114 | ||
3e2f2431 | 1115 | laddr = get_local_ipaddr(packet_get_connection_in()); |
da0561eb | 1116 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
3e2f2431 | 1117 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1118 | xfree(laddr); | |
da0561eb | 1119 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1120 | ||
56b3e9ce | 1121 | if (s->ttyfd != -1) |
1122 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1123 | if (s->term) | |
1124 | child_set_env(&env, &envsize, "TERM", s->term); | |
1125 | if (s->display) | |
1126 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1127 | if (original_command) |
1128 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1129 | original_command); | |
7368a6c8 | 1130 | |
ef51930f | 1131 | #ifdef _UNICOS |
1132 | if (cray_tmpdir[0] != '\0') | |
1133 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1134 | #endif /* _UNICOS */ | |
1135 | ||
3bfd27d5 | 1136 | /* |
1137 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1138 | * must have been set by a native authentication method (eg AIX or | |
1139 | * SIA), so copy it to the child. | |
1140 | */ | |
1141 | { | |
1142 | char *cp; | |
1143 | ||
1144 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1145 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1146 | } | |
1147 | ||
7368a6c8 | 1148 | #ifdef _AIX |
4936fcee | 1149 | { |
1150 | char *cp; | |
1151 | ||
1152 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1153 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
4936fcee | 1154 | read_environment_file(&env, &envsize, "/etc/environment"); |
1155 | } | |
7368a6c8 | 1156 | #endif |
ced49be2 | 1157 | #ifdef KRB5 |
6490a5d5 | 1158 | if (s->authctxt->krb5_ccname) |
ced49be2 | 1159 | child_set_env(&env, &envsize, "KRB5CCNAME", |
6490a5d5 | 1160 | s->authctxt->krb5_ccname); |
ced49be2 | 1161 | #endif |
7368a6c8 | 1162 | #ifdef USE_PAM |
ee48c949 | 1163 | /* |
1164 | * Pull in any environment variables that may have | |
1165 | * been set by PAM. | |
1166 | */ | |
7fceb20d | 1167 | if (options.use_pam) { |
2212fc98 | 1168 | char **p; |
b6453d99 | 1169 | |
2212fc98 | 1170 | p = fetch_pam_child_environment(); |
1171 | copy_environment(p, &env, &envsize); | |
1172 | free_pam_environment(p); | |
ee48c949 | 1173 | |
2212fc98 | 1174 | p = fetch_pam_environment(); |
ee48c949 | 1175 | copy_environment(p, &env, &envsize); |
1176 | free_pam_environment(p); | |
1177 | } | |
7368a6c8 | 1178 | #endif /* USE_PAM */ |
1179 | ||
149cdb60 | 1180 | if (auth_sock_name != NULL) |
7368a6c8 | 1181 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1182 | auth_sock_name); |
7368a6c8 | 1183 | |
1184 | /* read $HOME/.ssh/environment. */ | |
f00bab84 | 1185 | if (options.permit_user_env && !options.use_login) { |
71276795 | 1186 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e2e36358 | 1187 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
7368a6c8 | 1188 | read_environment_file(&env, &envsize, buf); |
1189 | } | |
1190 | if (debug_flag) { | |
1191 | /* dump the environment */ | |
1192 | fprintf(stderr, "Environment:\n"); | |
1193 | for (i = 0; env[i]; i++) | |
1194 | fprintf(stderr, " %.200s\n", env[i]); | |
1195 | } | |
f7342052 | 1196 | return env; |
1197 | } | |
1198 | ||
1199 | /* | |
1200 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1201 | * first in this order). | |
1202 | */ | |
1203 | static void | |
1204 | do_rc_files(Session *s, const char *shell) | |
1205 | { | |
1206 | FILE *f = NULL; | |
1207 | char cmd[1024]; | |
1208 | int do_xauth; | |
1209 | struct stat st; | |
1210 | ||
1211 | do_xauth = | |
1212 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1213 | ||
1214 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1215 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1216 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1217 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1218 | if (debug_flag) | |
1219 | fprintf(stderr, "Running %s\n", cmd); | |
1220 | f = popen(cmd, "w"); | |
1221 | if (f) { | |
1222 | if (do_xauth) | |
1223 | fprintf(f, "%s %s\n", s->auth_proto, | |
1224 | s->auth_data); | |
1225 | pclose(f); | |
1226 | } else | |
1227 | fprintf(stderr, "Could not run %s\n", | |
1228 | _PATH_SSH_USER_RC); | |
1229 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1230 | if (debug_flag) | |
1231 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1232 | _PATH_SSH_SYSTEM_RC); | |
1233 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1234 | if (f) { | |
1235 | if (do_xauth) | |
1236 | fprintf(f, "%s %s\n", s->auth_proto, | |
1237 | s->auth_data); | |
1238 | pclose(f); | |
1239 | } else | |
1240 | fprintf(stderr, "Could not run %s\n", | |
1241 | _PATH_SSH_SYSTEM_RC); | |
1242 | } else if (do_xauth && options.xauth_location != NULL) { | |
1243 | /* Add authority data to .Xauthority if appropriate. */ | |
1244 | if (debug_flag) { | |
1245 | fprintf(stderr, | |
fe661d8f | 1246 | "Running %.500s remove %.100s\n", |
2362db19 | 1247 | options.xauth_location, s->auth_display); |
fe661d8f | 1248 | fprintf(stderr, |
1249 | "%.500s add %.100s %.100s %.100s\n", | |
f7342052 | 1250 | options.xauth_location, s->auth_display, |
1251 | s->auth_proto, s->auth_data); | |
1252 | } | |
1253 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1254 | options.xauth_location); | |
1255 | f = popen(cmd, "w"); | |
1256 | if (f) { | |
fe661d8f | 1257 | fprintf(f, "remove %s\n", |
1258 | s->auth_display); | |
f7342052 | 1259 | fprintf(f, "add %s %s %s\n", |
1260 | s->auth_display, s->auth_proto, | |
1261 | s->auth_data); | |
1262 | pclose(f); | |
1263 | } else { | |
1264 | fprintf(stderr, "Could not run %s\n", | |
1265 | cmd); | |
1266 | } | |
1267 | } | |
1268 | } | |
1269 | ||
1270 | static void | |
1271 | do_nologin(struct passwd *pw) | |
1272 | { | |
1273 | FILE *f = NULL; | |
1274 | char buf[1024]; | |
1275 | ||
1276 | #ifdef HAVE_LOGIN_CAP | |
1277 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1278 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1279 | _PATH_NOLOGIN), "r"); | |
1280 | #else | |
1281 | if (pw->pw_uid) | |
1282 | f = fopen(_PATH_NOLOGIN, "r"); | |
1283 | #endif | |
1284 | if (f) { | |
1285 | /* /etc/nologin exists. Print its contents and exit. */ | |
bbe88b6d | 1286 | logit("User %.100s not allowed because %s exists", |
8bd4e2ae | 1287 | pw->pw_name, _PATH_NOLOGIN); |
f7342052 | 1288 | while (fgets(buf, sizeof(buf), f)) |
1289 | fputs(buf, stderr); | |
1290 | fclose(f); | |
99f4fb69 | 1291 | fflush(NULL); |
f7342052 | 1292 | exit(254); |
1293 | } | |
1294 | } | |
1295 | ||
1296 | /* Set login name, uid, gid, and groups. */ | |
1853d1ef | 1297 | void |
f7342052 | 1298 | do_setusercontext(struct passwd *pw) |
1299 | { | |
2731632a | 1300 | #ifndef HAVE_CYGWIN |
1301 | if (getuid() == 0 || geteuid() == 0) | |
f7342052 | 1302 | #endif /* HAVE_CYGWIN */ |
2731632a | 1303 | { |
1304 | ||
8bbfc882 | 1305 | #ifdef HAVE_SETPCRED |
166baacc | 1306 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1307 | fatal("Failed to set process credentials"); | |
8bbfc882 | 1308 | #endif /* HAVE_SETPCRED */ |
f7342052 | 1309 | #ifdef HAVE_LOGIN_CAP |
2d199535 | 1310 | # ifdef __bsdi__ |
8695f9f7 | 1311 | setpgid(0, 0); |
2d199535 | 1312 | # endif |
09d7ebd1 | 1313 | #ifdef GSSAPI |
1314 | if (options.gss_authentication) { | |
1315 | temporarily_use_uid(pw); | |
1316 | ssh_gssapi_storecreds(); | |
1317 | restore_uid(); | |
1318 | } | |
1319 | #endif | |
f4eaee12 | 1320 | # ifdef USE_PAM |
1321 | if (options.use_pam) { | |
1322 | do_pam_session(); | |
265edd5e | 1323 | do_pam_setcred(use_privsep); |
f4eaee12 | 1324 | } |
1325 | # endif /* USE_PAM */ | |
f7342052 | 1326 | if (setusercontext(lc, pw, pw->pw_uid, |
1327 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1328 | perror("unable to set user context"); | |
1329 | exit(1); | |
1330 | } | |
1331 | #else | |
1332 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1333 | /* Sets login uid for accounting */ | |
1334 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1335 | error("setluid: %s", strerror(errno)); | |
1336 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1337 | ||
1338 | if (setlogin(pw->pw_name) < 0) | |
1339 | error("setlogin failed: %s", strerror(errno)); | |
1340 | if (setgid(pw->pw_gid) < 0) { | |
1341 | perror("setgid"); | |
1342 | exit(1); | |
1343 | } | |
1344 | /* Initialize the group list. */ | |
1345 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1346 | perror("initgroups"); | |
1347 | exit(1); | |
1348 | } | |
1349 | endgrent(); | |
09d7ebd1 | 1350 | #ifdef GSSAPI |
1351 | if (options.gss_authentication) { | |
1352 | temporarily_use_uid(pw); | |
1353 | ssh_gssapi_storecreds(); | |
1354 | restore_uid(); | |
1355 | } | |
1356 | #endif | |
f7342052 | 1357 | # ifdef USE_PAM |
1358 | /* | |
aff51935 | 1359 | * PAM credentials may take the form of supplementary groups. |
f7342052 | 1360 | * These will have been wiped by the above initgroups() call. |
1361 | * Reestablish them here. | |
1362 | */ | |
49e82bb9 | 1363 | if (options.use_pam) { |
1364 | do_pam_session(); | |
265edd5e | 1365 | do_pam_setcred(use_privsep); |
49e82bb9 | 1366 | } |
f7342052 | 1367 | # endif /* USE_PAM */ |
1368 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1369 | irix_setusercontext(pw); | |
1370 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
e2bc41f9 | 1371 | # ifdef _AIX |
0ba40daa | 1372 | aix_usrinfo(pw); |
e2bc41f9 | 1373 | # endif /* _AIX */ |
a03acb8f | 1374 | #ifdef USE_LIBIAF |
4c653d8e | 1375 | if (set_id(pw->pw_name) != 0) { |
1376 | exit(1); | |
1377 | } | |
a03acb8f | 1378 | #endif /* USE_LIBIAF */ |
f7342052 | 1379 | /* Permanently switch to the desired uid. */ |
1380 | permanently_set_uid(pw); | |
1381 | #endif | |
1382 | } | |
2731632a | 1383 | |
1384 | #ifdef HAVE_CYGWIN | |
1385 | if (is_winnt) | |
1386 | #endif | |
f7342052 | 1387 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1388 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
ef4d1846 | 1389 | |
1390 | #ifdef WITH_SELINUX | |
1391 | ssh_selinux_setup_exec_context(pw->pw_name); | |
1392 | #endif | |
f7342052 | 1393 | } |
1394 | ||
37656beb | 1395 | static void |
1396 | do_pwchange(Session *s) | |
1397 | { | |
be2ca0c9 | 1398 | fflush(NULL); |
37656beb | 1399 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1400 | if (s->ttyfd != -1) { | |
f2107e97 | 1401 | fprintf(stderr, |
37656beb | 1402 | "You must change your password now and login again!\n"); |
3ade3b57 | 1403 | #ifdef PASSWD_NEEDS_USERNAME |
1404 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1405 | (char *)NULL); | |
1406 | #else | |
37656beb | 1407 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
3ade3b57 | 1408 | #endif |
37656beb | 1409 | perror("passwd"); |
1410 | } else { | |
1411 | fprintf(stderr, | |
1412 | "Password change required but no TTY available.\n"); | |
1413 | } | |
1414 | exit(1); | |
1415 | } | |
1416 | ||
51aeb639 | 1417 | static void |
1853d1ef | 1418 | launch_login(struct passwd *pw, const char *hostname) |
1419 | { | |
1420 | /* Launch login(1). */ | |
1421 | ||
85cc9118 | 1422 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1423 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1424 | (s->term ? s->term : "unknown"), |
1853d1ef | 1425 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1426 | #ifdef LOGIN_NO_ENDOPT |
1427 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1428 | #else | |
1853d1ef | 1429 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1430 | #endif |
1853d1ef | 1431 | |
1432 | /* Login couldn't be executed, die. */ | |
1433 | ||
1434 | perror("login"); | |
1435 | exit(1); | |
1436 | } | |
1437 | ||
37656beb | 1438 | static void |
1439 | child_close_fds(void) | |
1440 | { | |
1441 | int i; | |
1442 | ||
1443 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1444 | close(packet_get_connection_in()); | |
1445 | else { | |
1446 | close(packet_get_connection_in()); | |
1447 | close(packet_get_connection_out()); | |
1448 | } | |
1449 | /* | |
1450 | * Close all descriptors related to channels. They will still remain | |
1451 | * open in the parent. | |
1452 | */ | |
1453 | /* XXX better use close-on-exec? -markus */ | |
1454 | channel_close_all(); | |
1455 | ||
1456 | /* | |
1457 | * Close any extra file descriptors. Note that there may still be | |
1458 | * descriptors left by system functions. They will be closed later. | |
1459 | */ | |
1460 | endpwent(); | |
1461 | ||
1462 | /* | |
7b9b0103 | 1463 | * Close any extra open file descriptors so that we don't have them |
37656beb | 1464 | * hanging around in clients. Note that we want to do this after |
1465 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1466 | * descriptors open. | |
1467 | */ | |
1468 | for (i = 3; i < 64; i++) | |
1469 | close(i); | |
1470 | } | |
1471 | ||
f7342052 | 1472 | /* |
1473 | * Performs common processing for the child, such as setting up the | |
1474 | * environment, closing extra file descriptors, setting the user and group | |
1475 | * ids, and executing the command or shell. | |
1476 | */ | |
c33ba17e | 1477 | #define ARGV_MAX 10 |
f7342052 | 1478 | void |
1479 | do_child(Session *s, const char *command) | |
1480 | { | |
1481 | extern char **environ; | |
1482 | char **env; | |
c33ba17e | 1483 | char *argv[ARGV_MAX]; |
f7342052 | 1484 | const char *shell, *shell0, *hostname = NULL; |
1485 | struct passwd *pw = s->pw; | |
f7342052 | 1486 | |
1487 | /* remove hostkey from the child's memory */ | |
1488 | destroy_sensitive_data(); | |
1489 | ||
37656beb | 1490 | /* Force a password change */ |
1491 | if (s->authctxt->force_pwchange) { | |
1492 | do_setusercontext(pw); | |
1493 | child_close_fds(); | |
1494 | do_pwchange(s); | |
1495 | exit(1); | |
1496 | } | |
1497 | ||
f7342052 | 1498 | /* login(1) is only called if we execute the login shell */ |
1499 | if (options.use_login && command != NULL) | |
1500 | options.use_login = 0; | |
1501 | ||
ef51930f | 1502 | #ifdef _UNICOS |
1503 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1504 | #endif /* _UNICOS */ | |
1505 | ||
f7342052 | 1506 | /* |
1507 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1508 | * switch, so we let login(1) to this for us. | |
1509 | */ | |
1510 | if (!options.use_login) { | |
1511 | #ifdef HAVE_OSF_SIA | |
58d0df4e | 1512 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
f7342052 | 1513 | if (!check_quietlogin(s, command)) |
1514 | do_motd(); | |
1515 | #else /* HAVE_OSF_SIA */ | |
0a61a240 | 1516 | /* When PAM is enabled we rely on it to do the nologin check */ |
1517 | if (!options.use_pam) | |
1518 | do_nologin(pw); | |
f7342052 | 1519 | do_setusercontext(pw); |
25bfd4ff | 1520 | /* |
1521 | * PAM session modules in do_setusercontext may have | |
1522 | * generated messages, so if this in an interactive | |
1523 | * login then display them too. | |
1524 | */ | |
d0c890ac | 1525 | if (!check_quietlogin(s, command)) |
25bfd4ff | 1526 | display_loginmsg(); |
f7342052 | 1527 | #endif /* HAVE_OSF_SIA */ |
1528 | } | |
1529 | ||
abdec250 | 1530 | #ifdef USE_PAM |
d9720710 | 1531 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1532 | debug3("PAM session not opened, exiting"); | |
abdec250 | 1533 | display_loginmsg(); |
1534 | exit(254); | |
1535 | } | |
1536 | #endif | |
1537 | ||
f7342052 | 1538 | /* |
1539 | * Get the shell from the password data. An empty shell field is | |
1540 | * legal, and means /bin/sh. | |
1541 | */ | |
1542 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
32214c88 | 1543 | |
1544 | /* | |
1545 | * Make sure $SHELL points to the shell from the password file, | |
1546 | * even if shell is overridden from login.conf | |
1547 | */ | |
1548 | env = do_setup_env(s, shell); | |
1549 | ||
f7342052 | 1550 | #ifdef HAVE_LOGIN_CAP |
1551 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1552 | #endif | |
1553 | ||
2e73a022 | 1554 | /* we have to stash the hostname before we close our socket. */ |
1555 | if (options.use_login) | |
46e3af7f | 1556 | hostname = get_remote_name_or_ip(utmp_len, |
c5a7d788 | 1557 | options.use_dns); |
7368a6c8 | 1558 | /* |
1559 | * Close the connection descriptors; note that this is the child, and | |
1560 | * the server will still have the socket open, and it is important | |
1561 | * that we do not shutdown it. Note that the descriptors cannot be | |
1562 | * closed before building the environment, as we call | |
1563 | * get_remote_ipaddr there. | |
1564 | */ | |
37656beb | 1565 | child_close_fds(); |
7368a6c8 | 1566 | |
7368a6c8 | 1567 | /* |
2a8a6488 | 1568 | * Must take new environment into use so that .ssh/rc, |
1569 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1570 | */ |
1571 | environ = env; | |
1572 | ||
bcfcc5f9 | 1573 | #if defined(KRB5) && defined(USE_AFS) |
a1e30b47 | 1574 | /* |
1575 | * At this point, we check to see if AFS is active and if we have | |
1576 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1577 | * if we can (and need to) extend the ticket into an AFS token. If | |
1578 | * we don't do this, we run into potential problems if the user's | |
1579 | * home directory is in AFS and it's not world-readable. | |
1580 | */ | |
1581 | ||
1582 | if (options.kerberos_get_afs_token && k_hasafs() && | |
4e2e5cfd | 1583 | (s->authctxt->krb5_ctx != NULL)) { |
a1e30b47 | 1584 | char cell[64]; |
1585 | ||
1586 | debug("Getting AFS token"); | |
1587 | ||
1588 | k_setpag(); | |
1589 | ||
1590 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1591 | krb5_afslog(s->authctxt->krb5_ctx, | |
1592 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1593 | ||
1594 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1595 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1596 | } | |
1597 | #endif | |
1598 | ||
7b9b0103 | 1599 | /* Change current directory to the user's home directory. */ |
dab89049 | 1600 | if (chdir(pw->pw_dir) < 0) { |
1601 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1602 | pw->pw_dir, strerror(errno)); | |
1603 | #ifdef HAVE_LOGIN_CAP | |
1604 | if (login_getcapbool(lc, "requirehome", 0)) | |
1605 | exit(1); | |
1606 | #endif | |
1607 | } | |
1608 | ||
f7342052 | 1609 | if (!options.use_login) |
1610 | do_rc_files(s, shell); | |
1d3c30db | 1611 | |
1612 | /* restore SIGPIPE for child */ | |
c56969f9 | 1613 | signal(SIGPIPE, SIG_DFL); |
1d3c30db | 1614 | |
c33ba17e | 1615 | if (s->is_subsystem == SUBSYSTEM_INT_SFTP) { |
1616 | extern int optind, optreset; | |
1617 | int i; | |
1618 | char *p, *args; | |
1619 | ||
1620 | setproctitle("%s@internal-sftp-server", s->pw->pw_name); | |
1621 | args = strdup(command ? command : "sftp-server"); | |
1622 | for (i = 0, (p = strtok(args, " ")); p; (p = strtok(NULL, " "))) | |
1623 | if (i < ARGV_MAX - 1) | |
1624 | argv[i++] = p; | |
1625 | argv[i] = NULL; | |
1626 | optind = optreset = 1; | |
1627 | __progname = argv[0]; | |
1628 | exit(sftp_server_main(i, argv)); | |
1629 | } | |
1630 | ||
f7342052 | 1631 | if (options.use_login) { |
1853d1ef | 1632 | launch_login(pw, hostname); |
1633 | /* NEVERREACHED */ | |
f7342052 | 1634 | } |
1635 | ||
1636 | /* Get the last component of the shell name. */ | |
1637 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1638 | shell0++; | |
1639 | else | |
1640 | shell0 = shell; | |
1641 | ||
7368a6c8 | 1642 | /* |
1643 | * If we have no command, execute the shell. In this case, the shell | |
1644 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1645 | * this is a login shell. | |
1646 | */ | |
1647 | if (!command) { | |
f7342052 | 1648 | char argv0[256]; |
7368a6c8 | 1649 | |
f7342052 | 1650 | /* Start the shell. Set initial character to '-'. */ |
1651 | argv0[0] = '-'; | |
7368a6c8 | 1652 | |
f7342052 | 1653 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1654 | >= sizeof(argv0) - 1) { | |
1655 | errno = EINVAL; | |
7368a6c8 | 1656 | perror(shell); |
1657 | exit(1); | |
f7342052 | 1658 | } |
7368a6c8 | 1659 | |
f7342052 | 1660 | /* Execute the shell. */ |
1661 | argv[0] = argv0; | |
1662 | argv[1] = NULL; | |
1663 | execve(shell, argv, env); | |
7368a6c8 | 1664 | |
f7342052 | 1665 | /* Executing the shell failed. */ |
1666 | perror(shell); | |
1667 | exit(1); | |
7368a6c8 | 1668 | } |
1669 | /* | |
1670 | * Execute the command using the user's shell. This uses the -c | |
1671 | * option to execute the command. | |
1672 | */ | |
f7342052 | 1673 | argv[0] = (char *) shell0; |
7368a6c8 | 1674 | argv[1] = "-c"; |
1675 | argv[2] = (char *) command; | |
1676 | argv[3] = NULL; | |
1677 | execve(shell, argv, env); | |
1678 | perror(shell); | |
1679 | exit(1); | |
1680 | } | |
1681 | ||
1682 | Session * | |
1683 | session_new(void) | |
1684 | { | |
1685 | int i; | |
1686 | static int did_init = 0; | |
1687 | if (!did_init) { | |
1688 | debug("session_new: init"); | |
184eed6a | 1689 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1690 | sessions[i].used = 0; |
7368a6c8 | 1691 | } |
1692 | did_init = 1; | |
1693 | } | |
184eed6a | 1694 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1695 | Session *s = &sessions[i]; |
1696 | if (! s->used) { | |
690d0d7f | 1697 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1698 | s->chanid = -1; |
1699 | s->ptyfd = -1; | |
1700 | s->ttyfd = -1; | |
7368a6c8 | 1701 | s->used = 1; |
86066315 | 1702 | s->self = i; |
d08341e6 | 1703 | s->x11_chanids = NULL; |
02323c45 | 1704 | debug("session_new: session %d", i); |
7368a6c8 | 1705 | return s; |
1706 | } | |
1707 | } | |
1708 | return NULL; | |
1709 | } | |
1710 | ||
396c147e | 1711 | static void |
7368a6c8 | 1712 | session_dump(void) |
1713 | { | |
1714 | int i; | |
184eed6a | 1715 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1716 | Session *s = &sessions[i]; |
c457707e | 1717 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1718 | s->used, |
1719 | s->self, | |
1720 | s, | |
1721 | s->chanid, | |
c457707e | 1722 | (long)s->pid); |
7368a6c8 | 1723 | } |
1724 | } | |
1725 | ||
e78a59f5 | 1726 | int |
57156994 | 1727 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1728 | { |
1729 | Session *s = session_new(); | |
1730 | debug("session_open: channel %d", chanid); | |
1731 | if (s == NULL) { | |
1732 | error("no more sessions"); | |
1733 | return 0; | |
1734 | } | |
57156994 | 1735 | s->authctxt = authctxt; |
1736 | s->pw = authctxt->pw; | |
fdaef11e | 1737 | if (s->pw == NULL || !authctxt->valid) |
0725ea77 | 1738 | fatal("no user for session %d", s->self); |
0b242b12 | 1739 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1740 | s->chanid = chanid; | |
e78a59f5 | 1741 | return 1; |
1742 | } | |
1743 | ||
1853d1ef | 1744 | Session * |
1745 | session_by_tty(char *tty) | |
1746 | { | |
1747 | int i; | |
1748 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1749 | Session *s = &sessions[i]; | |
1750 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1751 | debug("session_by_tty: session %d tty %s", i, tty); | |
1752 | return s; | |
1753 | } | |
1754 | } | |
1755 | debug("session_by_tty: unknown tty %.100s", tty); | |
1756 | session_dump(); | |
1757 | return NULL; | |
1758 | } | |
1759 | ||
396c147e | 1760 | static Session * |
e78a59f5 | 1761 | session_by_channel(int id) |
1762 | { | |
1763 | int i; | |
184eed6a | 1764 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1765 | Session *s = &sessions[i]; |
1766 | if (s->used && s->chanid == id) { | |
1767 | debug("session_by_channel: session %d channel %d", i, id); | |
1768 | return s; | |
1769 | } | |
1770 | } | |
1771 | debug("session_by_channel: unknown channel %d", id); | |
1772 | session_dump(); | |
1773 | return NULL; | |
1774 | } | |
1775 | ||
d08341e6 | 1776 | static Session * |
1777 | session_by_x11_channel(int id) | |
1778 | { | |
1779 | int i, j; | |
1780 | ||
1781 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1782 | Session *s = &sessions[i]; | |
1783 | ||
1784 | if (s->x11_chanids == NULL || !s->used) | |
1785 | continue; | |
1786 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
1787 | if (s->x11_chanids[j] == id) { | |
1788 | debug("session_by_x11_channel: session %d " | |
1789 | "channel %d", s->self, id); | |
1790 | return s; | |
1791 | } | |
1792 | } | |
1793 | } | |
1794 | debug("session_by_x11_channel: unknown channel %d", id); | |
1795 | session_dump(); | |
1796 | return NULL; | |
1797 | } | |
1798 | ||
396c147e | 1799 | static Session * |
e78a59f5 | 1800 | session_by_pid(pid_t pid) |
1801 | { | |
1802 | int i; | |
c457707e | 1803 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1804 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1805 | Session *s = &sessions[i]; |
1806 | if (s->used && s->pid == pid) | |
1807 | return s; | |
1808 | } | |
c457707e | 1809 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1810 | session_dump(); |
1811 | return NULL; | |
1812 | } | |
1813 | ||
396c147e | 1814 | static int |
e78a59f5 | 1815 | session_window_change_req(Session *s) |
1816 | { | |
1817 | s->col = packet_get_int(); | |
1818 | s->row = packet_get_int(); | |
1819 | s->xpixel = packet_get_int(); | |
1820 | s->ypixel = packet_get_int(); | |
95500969 | 1821 | packet_check_eom(); |
e78a59f5 | 1822 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1823 | return 1; | |
1824 | } | |
1825 | ||
396c147e | 1826 | static int |
e78a59f5 | 1827 | session_pty_req(Session *s) |
1828 | { | |
1e3b8b07 | 1829 | u_int len; |
30dcc918 | 1830 | int n_bytes; |
762715ce | 1831 | |
653d5f86 | 1832 | if (no_pty_flag) { |
1833 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1834 | return 0; |
653d5f86 | 1835 | } |
1836 | if (s->ttyfd != -1) { | |
1837 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1838 | return 0; |
653d5f86 | 1839 | } |
1840 | ||
e78a59f5 | 1841 | s->term = packet_get_string(&len); |
653d5f86 | 1842 | |
1843 | if (compat20) { | |
1844 | s->col = packet_get_int(); | |
1845 | s->row = packet_get_int(); | |
1846 | } else { | |
1847 | s->row = packet_get_int(); | |
1848 | s->col = packet_get_int(); | |
1849 | } | |
e78a59f5 | 1850 | s->xpixel = packet_get_int(); |
1851 | s->ypixel = packet_get_int(); | |
1852 | ||
1853 | if (strcmp(s->term, "") == 0) { | |
1854 | xfree(s->term); | |
1855 | s->term = NULL; | |
1856 | } | |
653d5f86 | 1857 | |
e78a59f5 | 1858 | /* Allocate a pty and open it. */ |
653d5f86 | 1859 | debug("Allocating pty."); |
1853d1ef | 1860 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1861 | if (s->term) |
1862 | xfree(s->term); | |
e78a59f5 | 1863 | s->term = NULL; |
1864 | s->ptyfd = -1; | |
1865 | s->ttyfd = -1; | |
1866 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1867 | return 0; |
e78a59f5 | 1868 | } |
1869 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1870 | |
1871 | /* for SSH1 the tty modes length is not given */ | |
1872 | if (!compat20) | |
1873 | n_bytes = packet_remaining(); | |
1874 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1875 | ||
1853d1ef | 1876 | if (!use_privsep) |
1877 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1878 | |
1879 | /* Set window size from the packet. */ | |
e78a59f5 | 1880 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1881 | ||
95500969 | 1882 | packet_check_eom(); |
1d1ffb87 | 1883 | session_proctitle(s); |
e78a59f5 | 1884 | return 1; |
1885 | } | |
1886 | ||
396c147e | 1887 | static int |
0b242b12 | 1888 | session_subsystem_req(Session *s) |
1889 | { | |
01855277 | 1890 | struct stat st; |
1e3b8b07 | 1891 | u_int len; |
0b242b12 | 1892 | int success = 0; |
d66ce1a1 | 1893 | char *prog, *cmd, *subsys = packet_get_string(&len); |
2ceb8101 | 1894 | u_int i; |
0b242b12 | 1895 | |
95500969 | 1896 | packet_check_eom(); |
bbe88b6d | 1897 | logit("subsystem request for %.100s", subsys); |
0b242b12 | 1898 | |
38c295d6 | 1899 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1900 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
d66ce1a1 | 1901 | prog = options.subsystem_command[i]; |
1902 | cmd = options.subsystem_args[i]; | |
c33ba17e | 1903 | if (!strcmp("internal-sftp", prog)) { |
1904 | s->is_subsystem = SUBSYSTEM_INT_SFTP; | |
1905 | } else if (stat(prog, &st) < 0) { | |
d66ce1a1 | 1906 | error("subsystem: cannot stat %s: %s", prog, |
01855277 | 1907 | strerror(errno)); |
1908 | break; | |
c33ba17e | 1909 | } else { |
1910 | s->is_subsystem = SUBSYSTEM_EXT; | |
01855277 | 1911 | } |
1912 | debug("subsystem: exec() %s", cmd); | |
01855277 | 1913 | do_exec(s, cmd); |
38c295d6 | 1914 | success = 1; |
24932ee9 | 1915 | break; |
38c295d6 | 1916 | } |
1917 | } | |
1918 | ||
1919 | if (!success) | |
bbe88b6d | 1920 | logit("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1921 | subsys); |
38c295d6 | 1922 | |
0b242b12 | 1923 | xfree(subsys); |
1924 | return success; | |
1925 | } | |
1926 | ||
396c147e | 1927 | static int |
0b242b12 | 1928 | session_x11_req(Session *s) |
1929 | { | |
8dcd9d5c | 1930 | int success; |
0b242b12 | 1931 | |
d08341e6 | 1932 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
1933 | error("session_x11_req: session %d: " | |
8918b906 | 1934 | "x11 forwarding already active", s->self); |
d08341e6 | 1935 | return 0; |
1936 | } | |
0b242b12 | 1937 | s->single_connection = packet_get_char(); |
1938 | s->auth_proto = packet_get_string(NULL); | |
1939 | s->auth_data = packet_get_string(NULL); | |
1940 | s->screen = packet_get_int(); | |
95500969 | 1941 | packet_check_eom(); |
0b242b12 | 1942 | |
8dcd9d5c | 1943 | success = session_setup_x11fwd(s); |
1944 | if (!success) { | |
0b242b12 | 1945 | xfree(s->auth_proto); |
1946 | xfree(s->auth_data); | |
1500bcdd | 1947 | s->auth_proto = NULL; |
1948 | s->auth_data = NULL; | |
0b242b12 | 1949 | } |
8dcd9d5c | 1950 | return success; |
0b242b12 | 1951 | } |
1952 | ||
396c147e | 1953 | static int |
38c295d6 | 1954 | session_shell_req(Session *s) |
1955 | { | |
95500969 | 1956 | packet_check_eom(); |
dac6753b | 1957 | do_exec(s, NULL); |
38c295d6 | 1958 | return 1; |
1959 | } | |
1960 | ||
396c147e | 1961 | static int |
38c295d6 | 1962 | session_exec_req(Session *s) |
1963 | { | |
1e3b8b07 | 1964 | u_int len; |
38c295d6 | 1965 | char *command = packet_get_string(&len); |
95500969 | 1966 | packet_check_eom(); |
dac6753b | 1967 | do_exec(s, command); |
c95add71 | 1968 | xfree(command); |
38c295d6 | 1969 | return 1; |
1970 | } | |
1971 | ||
16a79097 | 1972 | static int |
1973 | session_break_req(Session *s) | |
1974 | { | |
16a79097 | 1975 | |
f6be21a0 | 1976 | packet_get_int(); /* ignored */ |
16a79097 | 1977 | packet_check_eom(); |
1978 | ||
8168a86a | 1979 | if (s->ttyfd == -1 || |
1980 | tcsendbreak(s->ttyfd, 0) < 0) | |
16a79097 | 1981 | return 0; |
16a79097 | 1982 | return 1; |
1983 | } | |
1984 | ||
61a2c1da | 1985 | static int |
1986 | session_env_req(Session *s) | |
1987 | { | |
1988 | char *name, *val; | |
1989 | u_int name_len, val_len, i; | |
1990 | ||
1991 | name = packet_get_string(&name_len); | |
1992 | val = packet_get_string(&val_len); | |
1993 | packet_check_eom(); | |
1994 | ||
1995 | /* Don't set too many environment variables */ | |
1996 | if (s->num_env > 128) { | |
1997 | debug2("Ignoring env request %s: too many env vars", name); | |
1998 | goto fail; | |
1999 | } | |
2000 | ||
2001 | for (i = 0; i < options.num_accept_env; i++) { | |
2002 | if (match_pattern(name, options.accept_env[i])) { | |
2003 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
c5d10563 | 2004 | s->env = xrealloc(s->env, s->num_env + 1, |
2005 | sizeof(*s->env)); | |
61a2c1da | 2006 | s->env[s->num_env].name = name; |
2007 | s->env[s->num_env].val = val; | |
2008 | s->num_env++; | |
2009 | return (1); | |
2010 | } | |
2011 | } | |
2012 | debug2("Ignoring env request %s: disallowed name", name); | |
2013 | ||
2014 | fail: | |
2015 | xfree(name); | |
2016 | xfree(val); | |
2017 | return (0); | |
2018 | } | |
2019 | ||
396c147e | 2020 | static int |
fa08c86b | 2021 | session_auth_agent_req(Session *s) |
2022 | { | |
2023 | static int called = 0; | |
95500969 | 2024 | packet_check_eom(); |
d343d900 | 2025 | if (no_agent_forwarding_flag) { |
2026 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
2027 | return 0; | |
2028 | } | |
fa08c86b | 2029 | if (called) { |
2030 | return 0; | |
2031 | } else { | |
2032 | called = 1; | |
2033 | return auth_input_request_forwarding(s->pw); | |
2034 | } | |
2035 | } | |
2036 | ||
7899c98f | 2037 | int |
2038 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 2039 | { |
e78a59f5 | 2040 | int success = 0; |
e78a59f5 | 2041 | Session *s; |
e78a59f5 | 2042 | |
7899c98f | 2043 | if ((s = session_by_channel(c->self)) == NULL) { |
bbe88b6d | 2044 | logit("session_input_channel_req: no session %d req %.100s", |
7899c98f | 2045 | c->self, rtype); |
2046 | return 0; | |
2047 | } | |
2048 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 2049 | |
2050 | /* | |
e5d7a405 | 2051 | * a session is in LARVAL state until a shell, a command |
2052 | * or a subsystem is executed | |
e78a59f5 | 2053 | */ |
2054 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2055 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 2056 | success = session_shell_req(s); |
e78a59f5 | 2057 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 2058 | success = session_exec_req(s); |
e78a59f5 | 2059 | } else if (strcmp(rtype, "pty-req") == 0) { |
803c4226 | 2060 | success = session_pty_req(s); |
0b242b12 | 2061 | } else if (strcmp(rtype, "x11-req") == 0) { |
2062 | success = session_x11_req(s); | |
fa08c86b | 2063 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
2064 | success = session_auth_agent_req(s); | |
0b242b12 | 2065 | } else if (strcmp(rtype, "subsystem") == 0) { |
2066 | success = session_subsystem_req(s); | |
61a2c1da | 2067 | } else if (strcmp(rtype, "env") == 0) { |
2068 | success = session_env_req(s); | |
e78a59f5 | 2069 | } |
2070 | } | |
2071 | if (strcmp(rtype, "window-change") == 0) { | |
2072 | success = session_window_change_req(s); | |
c6c76c99 | 2073 | } else if (strcmp(rtype, "break") == 0) { |
2074 | success = session_break_req(s); | |
e78a59f5 | 2075 | } |
c6c76c99 | 2076 | |
7899c98f | 2077 | return success; |
e78a59f5 | 2078 | } |
2079 | ||
2080 | void | |
2081 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2082 | { | |
2083 | if (!compat20) | |
2084 | fatal("session_set_fds: called for proto != 2.0"); | |
2085 | /* | |
2086 | * now that have a child and a pipe to the child, | |
2087 | * we can activate our channel and register the fd's | |
2088 | */ | |
2089 | if (s->chanid == -1) | |
2090 | fatal("no channel for session %d", s->self); | |
2091 | channel_set_fds(s->chanid, | |
2092 | fdout, fdin, fderr, | |
a22aff1f | 2093 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 2094 | 1, |
2095 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 2096 | } |
2097 | ||
86066315 | 2098 | /* |
2099 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2100 | * (e.g., due to a dropped connection). | |
2101 | */ | |
1853d1ef | 2102 | void |
2362db19 | 2103 | session_pty_cleanup2(Session *s) |
7368a6c8 | 2104 | { |
86066315 | 2105 | if (s == NULL) { |
2106 | error("session_pty_cleanup: no session"); | |
2107 | return; | |
2108 | } | |
2109 | if (s->ttyfd == -1) | |
7368a6c8 | 2110 | return; |
2111 | ||
0725ea77 | 2112 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 2113 | |
7368a6c8 | 2114 | /* Record that the user has logged out. */ |
86066315 | 2115 | if (s->pid != 0) |
f3837bc6 | 2116 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 2117 | |
2118 | /* Release the pseudo-tty. */ | |
1853d1ef | 2119 | if (getuid() == 0) |
2120 | pty_release(s->tty); | |
7368a6c8 | 2121 | |
2122 | /* | |
2123 | * Close the server side of the socket pairs. We must do this after | |
2124 | * the pty cleanup, so that another process doesn't get this pty | |
2125 | * while we're still cleaning up. | |
2126 | */ | |
2127 | if (close(s->ptymaster) < 0) | |
1853d1ef | 2128 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 2129 | |
2130 | /* unlink pty from session */ | |
2131 | s->ttyfd = -1; | |
7368a6c8 | 2132 | } |
e78a59f5 | 2133 | |
1853d1ef | 2134 | void |
2362db19 | 2135 | session_pty_cleanup(Session *s) |
1853d1ef | 2136 | { |
2362db19 | 2137 | PRIVSEP(session_pty_cleanup2(s)); |
1853d1ef | 2138 | } |
2139 | ||
6c723e7c | 2140 | static char * |
2141 | sig2name(int sig) | |
2142 | { | |
2143 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2144 | SSH_SIG(ABRT); | |
2145 | SSH_SIG(ALRM); | |
2146 | SSH_SIG(FPE); | |
2147 | SSH_SIG(HUP); | |
2148 | SSH_SIG(ILL); | |
2149 | SSH_SIG(INT); | |
2150 | SSH_SIG(KILL); | |
2151 | SSH_SIG(PIPE); | |
2152 | SSH_SIG(QUIT); | |
2153 | SSH_SIG(SEGV); | |
2154 | SSH_SIG(TERM); | |
2155 | SSH_SIG(USR1); | |
2156 | SSH_SIG(USR2); | |
2157 | #undef SSH_SIG | |
2158 | return "SIG@openssh.com"; | |
2159 | } | |
2160 | ||
d08341e6 | 2161 | static void |
2162 | session_close_x11(int id) | |
2163 | { | |
2164 | Channel *c; | |
2165 | ||
b872f7f0 | 2166 | if ((c = channel_by_id(id)) == NULL) { |
d08341e6 | 2167 | debug("session_close_x11: x11 channel %d missing", id); |
2168 | } else { | |
2169 | /* Detach X11 listener */ | |
2170 | debug("session_close_x11: detach x11 channel %d", id); | |
2171 | channel_cancel_cleanup(id); | |
2172 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2173 | chan_mark_dead(c); | |
2174 | } | |
2175 | } | |
2176 | ||
2177 | static void | |
2178 | session_close_single_x11(int id, void *arg) | |
2179 | { | |
2180 | Session *s; | |
2181 | u_int i; | |
2182 | ||
2183 | debug3("session_close_single_x11: channel %d", id); | |
2184 | channel_cancel_cleanup(id); | |
803c4226 | 2185 | if ((s = session_by_x11_channel(id)) == NULL) |
d08341e6 | 2186 | fatal("session_close_single_x11: no x11 channel %d", id); |
2187 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2188 | debug("session_close_single_x11: session %d: " | |
2189 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2190 | /* | |
2191 | * The channel "id" is already closing, but make sure we | |
2192 | * close all of its siblings. | |
2193 | */ | |
2194 | if (s->x11_chanids[i] != id) | |
2195 | session_close_x11(s->x11_chanids[i]); | |
2196 | } | |
2197 | xfree(s->x11_chanids); | |
2198 | s->x11_chanids = NULL; | |
2199 | if (s->display) { | |
2200 | xfree(s->display); | |
2201 | s->display = NULL; | |
2202 | } | |
2203 | if (s->auth_proto) { | |
2204 | xfree(s->auth_proto); | |
2205 | s->auth_proto = NULL; | |
2206 | } | |
2207 | if (s->auth_data) { | |
2208 | xfree(s->auth_data); | |
2209 | s->auth_data = NULL; | |
2210 | } | |
2211 | if (s->auth_display) { | |
2212 | xfree(s->auth_display); | |
2213 | s->auth_display = NULL; | |
2214 | } | |
2215 | } | |
2216 | ||
396c147e | 2217 | static void |
e78a59f5 | 2218 | session_exit_message(Session *s, int status) |
2219 | { | |
2220 | Channel *c; | |
5a4ae906 | 2221 | |
2222 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 2223 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 2224 | s->self, s->chanid); |
c457707e | 2225 | debug("session_exit_message: session %d channel %d pid %ld", |
2226 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 2227 | |
2228 | if (WIFEXITED(status)) { | |
5a4ae906 | 2229 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 2230 | packet_put_int(WEXITSTATUS(status)); |
2231 | packet_send(); | |
2232 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 2233 | channel_request_start(s->chanid, "exit-signal", 0); |
6c723e7c | 2234 | packet_put_cstring(sig2name(WTERMSIG(status))); |
a64009ad | 2235 | #ifdef WCOREDUMP |
e78a59f5 | 2236 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 2237 | #else /* WCOREDUMP */ |
2238 | packet_put_char(0); | |
2239 | #endif /* WCOREDUMP */ | |
e78a59f5 | 2240 | packet_put_cstring(""); |
2241 | packet_put_cstring(""); | |
2242 | packet_send(); | |
2243 | } else { | |
2244 | /* Some weird exit cause. Just exit. */ | |
2245 | packet_disconnect("wait returned status %04x.", status); | |
2246 | } | |
2247 | ||
2248 | /* disconnect channel */ | |
2249 | debug("session_exit_message: release channel %d", s->chanid); | |
8cd0437d | 2250 | |
2251 | /* | |
2252 | * Adjust cleanup callback attachment to send close messages when | |
b4bbf172 | 2253 | * the channel gets EOF. The session will be then be closed |
8cd0437d | 2254 | * by session_close_by_channel when the childs close their fds. |
2255 | */ | |
2256 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2257 | ||
9da5c3c9 | 2258 | /* |
2259 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2260 | * interested in data we write. | |
2261 | * Note that we must not call 'chan_read_failed', since there could | |
2262 | * be some more data waiting in the pipe. | |
2263 | */ | |
0b242b12 | 2264 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
2265 | chan_write_failed(c); | |
e78a59f5 | 2266 | } |
2267 | ||
1853d1ef | 2268 | void |
86066315 | 2269 | session_close(Session *s) |
e78a59f5 | 2270 | { |
2ceb8101 | 2271 | u_int i; |
61a2c1da | 2272 | |
c457707e | 2273 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
2362db19 | 2274 | if (s->ttyfd != -1) |
86066315 | 2275 | session_pty_cleanup(s); |
e78a59f5 | 2276 | if (s->term) |
2277 | xfree(s->term); | |
2278 | if (s->display) | |
2279 | xfree(s->display); | |
d08341e6 | 2280 | if (s->x11_chanids) |
2281 | xfree(s->x11_chanids); | |
f9314d9a | 2282 | if (s->auth_display) |
2283 | xfree(s->auth_display); | |
e78a59f5 | 2284 | if (s->auth_data) |
2285 | xfree(s->auth_data); | |
2286 | if (s->auth_proto) | |
2287 | xfree(s->auth_proto); | |
2288 | s->used = 0; | |
0875ae22 | 2289 | if (s->env != NULL) { |
2290 | for (i = 0; i < s->num_env; i++) { | |
2291 | xfree(s->env[i].name); | |
2292 | xfree(s->env[i].val); | |
2293 | } | |
61a2c1da | 2294 | xfree(s->env); |
0875ae22 | 2295 | } |
1d1ffb87 | 2296 | session_proctitle(s); |
e78a59f5 | 2297 | } |
2298 | ||
2299 | void | |
2300 | session_close_by_pid(pid_t pid, int status) | |
2301 | { | |
2302 | Session *s = session_by_pid(pid); | |
2303 | if (s == NULL) { | |
c457707e | 2304 | debug("session_close_by_pid: no session for pid %ld", |
2305 | (long)pid); | |
e78a59f5 | 2306 | return; |
2307 | } | |
2308 | if (s->chanid != -1) | |
2309 | session_exit_message(s, status); | |
8cd0437d | 2310 | if (s->ttyfd != -1) |
2311 | session_pty_cleanup(s); | |
4c721c3d | 2312 | s->pid = 0; |
e78a59f5 | 2313 | } |
2314 | ||
2315 | /* | |
2316 | * this is called when a channel dies before | |
2317 | * the session 'child' itself dies | |
2318 | */ | |
2319 | void | |
2320 | session_close_by_channel(int id, void *arg) | |
2321 | { | |
2322 | Session *s = session_by_channel(id); | |
8cd0437d | 2323 | u_int i; |
d08341e6 | 2324 | |
e78a59f5 | 2325 | if (s == NULL) { |
418e724c | 2326 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 2327 | return; |
2328 | } | |
c457707e | 2329 | debug("session_close_by_channel: channel %d child %ld", |
2330 | id, (long)s->pid); | |
d5f24f94 | 2331 | if (s->pid != 0) { |
418e724c | 2332 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 2333 | /* |
2334 | * delay detach of session, but release pty, since | |
2335 | * the fd's to the child are already closed | |
2336 | */ | |
2362db19 | 2337 | if (s->ttyfd != -1) |
efcc9957 | 2338 | session_pty_cleanup(s); |
418e724c | 2339 | return; |
e78a59f5 | 2340 | } |
418e724c | 2341 | /* detach by removing callback */ |
2342 | channel_cancel_cleanup(s->chanid); | |
8cd0437d | 2343 | |
2344 | /* Close any X11 listeners associated with this session */ | |
2345 | if (s->x11_chanids != NULL) { | |
2346 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2347 | session_close_x11(s->x11_chanids[i]); | |
2348 | s->x11_chanids[i] = -1; | |
2349 | } | |
2350 | } | |
2351 | ||
418e724c | 2352 | s->chanid = -1; |
d5f24f94 | 2353 | session_close(s); |
2354 | } | |
2355 | ||
2356 | void | |
1853d1ef | 2357 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 2358 | { |
2359 | int i; | |
184eed6a | 2360 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 2361 | Session *s = &sessions[i]; |
1853d1ef | 2362 | if (s->used) { |
2363 | if (closefunc != NULL) | |
2364 | closefunc(s); | |
2365 | else | |
2366 | session_close(s); | |
2367 | } | |
d5f24f94 | 2368 | } |
e78a59f5 | 2369 | } |
2370 | ||
396c147e | 2371 | static char * |
1d1ffb87 | 2372 | session_tty_list(void) |
2373 | { | |
2374 | static char buf[1024]; | |
2375 | int i; | |
d0104542 | 2376 | char *cp; |
2377 | ||
1d1ffb87 | 2378 | buf[0] = '\0'; |
184eed6a | 2379 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 2380 | Session *s = &sessions[i]; |
2381 | if (s->used && s->ttyfd != -1) { | |
b6453d99 | 2382 | |
d0104542 | 2383 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2384 | cp = strrchr(s->tty, '/'); | |
2385 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2386 | } else | |
2387 | cp = s->tty + 5; | |
b6453d99 | 2388 | |
1d1ffb87 | 2389 | if (buf[0] != '\0') |
2390 | strlcat(buf, ",", sizeof buf); | |
d0104542 | 2391 | strlcat(buf, cp, sizeof buf); |
1d1ffb87 | 2392 | } |
2393 | } | |
2394 | if (buf[0] == '\0') | |
2395 | strlcpy(buf, "notty", sizeof buf); | |
2396 | return buf; | |
2397 | } | |
2398 | ||
2399 | void | |
2400 | session_proctitle(Session *s) | |
2401 | { | |
2402 | if (s->pw == NULL) | |
2403 | error("no user for session %d", s->self); | |
2404 | else | |
2405 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2406 | } | |
2407 | ||
8dcd9d5c | 2408 | int |
2409 | session_setup_x11fwd(Session *s) | |
2410 | { | |
8dcd9d5c | 2411 | struct stat st; |
c9d0ad9b | 2412 | char display[512], auth_display[512]; |
2413 | char hostname[MAXHOSTNAMELEN]; | |
d08341e6 | 2414 | u_int i; |
8dcd9d5c | 2415 | |
2416 | if (no_x11_forwarding_flag) { | |
2417 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2418 | return 0; | |
2419 | } | |
2420 | if (!options.x11_forwarding) { | |
2421 | debug("X11 forwarding disabled in server configuration file."); | |
2422 | return 0; | |
2423 | } | |
2424 | if (!options.xauth_location || | |
2425 | (stat(options.xauth_location, &st) == -1)) { | |
2426 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2427 | return 0; | |
2428 | } | |
ff027d84 | 2429 | if (options.use_login) { |
2430 | packet_send_debug("X11 forwarding disabled; " | |
2431 | "not compatible with UseLogin=yes."); | |
2432 | return 0; | |
2433 | } | |
b44de2b1 | 2434 | if (s->display != NULL) { |
8dcd9d5c | 2435 | debug("X11 display already set."); |
2436 | return 0; | |
2437 | } | |
57f228e8 | 2438 | if (x11_create_display_inet(options.x11_display_offset, |
2439 | options.x11_use_localhost, s->single_connection, | |
d08341e6 | 2440 | &s->display_number, &s->x11_chanids) == -1) { |
b44de2b1 | 2441 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 2442 | return 0; |
2443 | } | |
d08341e6 | 2444 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2445 | channel_register_cleanup(s->x11_chanids[i], | |
8cd0437d | 2446 | session_close_single_x11, 0); |
d08341e6 | 2447 | } |
c9d0ad9b | 2448 | |
2449 | /* Set up a suitable value for the DISPLAY variable. */ | |
2450 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2451 | fatal("gethostname: %.100s", strerror(errno)); | |
2452 | /* | |
2453 | * auth_display must be used as the displayname when the | |
2454 | * authorization entry is added with xauth(1). This will be | |
2455 | * different than the DISPLAY string for localhost displays. | |
2456 | */ | |
e6e573bd | 2457 | if (options.x11_use_localhost) { |
57f228e8 | 2458 | snprintf(display, sizeof display, "localhost:%u.%u", |
c9d0ad9b | 2459 | s->display_number, s->screen); |
57f228e8 | 2460 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
f9314d9a | 2461 | s->display_number, s->screen); |
c9d0ad9b | 2462 | s->display = xstrdup(display); |
f9314d9a | 2463 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 2464 | } else { |
2465 | #ifdef IPADDR_IN_DISPLAY | |
2466 | struct hostent *he; | |
2467 | struct in_addr my_addr; | |
2468 | ||
2469 | he = gethostbyname(hostname); | |
2470 | if (he == NULL) { | |
2471 | error("Can't get IP address for X11 DISPLAY."); | |
2472 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2473 | return 0; | |
2474 | } | |
2475 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
57f228e8 | 2476 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
c9d0ad9b | 2477 | s->display_number, s->screen); |
2478 | #else | |
57f228e8 | 2479 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
c9d0ad9b | 2480 | s->display_number, s->screen); |
2481 | #endif | |
2482 | s->display = xstrdup(display); | |
f9314d9a | 2483 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2484 | } |
2485 | ||
8dcd9d5c | 2486 | return 1; |
2487 | } | |
2488 | ||
396c147e | 2489 | static void |
59c97189 | 2490 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2491 | { |
57156994 | 2492 | server_loop2(authctxt); |
2362db19 | 2493 | } |
2494 | ||
2495 | void | |
2496 | do_cleanup(Authctxt *authctxt) | |
2497 | { | |
2498 | static int called = 0; | |
2499 | ||
2500 | debug("do_cleanup"); | |
2501 | ||
2502 | /* no cleanup if we're in the child for login shell */ | |
2503 | if (is_child) | |
2504 | return; | |
2505 | ||
2506 | /* avoid double cleanup */ | |
2507 | if (called) | |
2508 | return; | |
2509 | called = 1; | |
2510 | ||
8d5728b7 | 2511 | if (authctxt == NULL) |
2362db19 | 2512 | return; |
8d5728b7 | 2513 | |
2514 | #ifdef USE_PAM | |
2515 | if (options.use_pam) { | |
2516 | sshpam_cleanup(); | |
2517 | sshpam_thread_cleanup(); | |
2518 | } | |
2519 | #endif | |
2520 | ||
2521 | if (!authctxt->authenticated) | |
2522 | return; | |
2523 | ||
2362db19 | 2524 | #ifdef KRB5 |
2525 | if (options.kerberos_ticket_cleanup && | |
2526 | authctxt->krb5_ctx) | |
2527 | krb5_cleanup_proc(authctxt); | |
7364bd04 | 2528 | #endif |
2362db19 | 2529 | |
2530 | #ifdef GSSAPI | |
2531 | if (compat20 && options.gss_cleanup_creds) | |
2532 | ssh_gssapi_cleanup_creds(); | |
2533 | #endif | |
2534 | ||
2535 | /* remove agent socket */ | |
2536 | auth_sock_cleanup_proc(authctxt->pw); | |
2537 | ||
2538 | /* | |
2539 | * Cleanup ptys/utmp only if privsep is disabled, | |
2540 | * or if running in monitor. | |
2541 | */ | |
2542 | if (!use_privsep || mm_is_monitor()) | |
2543 | session_destroy_all(session_pty_cleanup2); | |
e78a59f5 | 2544 | } |