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7368a6c8 | 1 | /* |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
bcbf86ec | 4 | * |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | * | |
e78a59f5 | 11 | * SSH2 support by Markus Friedl. |
a96070d4 | 12 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 13 | * |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions | |
16 | * are met: | |
17 | * 1. Redistributions of source code must retain the above copyright | |
18 | * notice, this list of conditions and the following disclaimer. | |
19 | * 2. Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
e78a59f5 | 33 | */ |
7368a6c8 | 34 | |
35 | #include "includes.h" | |
61a2c1da | 36 | RCSID("$OpenBSD: session.c,v 1.173 2004/04/27 09:46:37 djm Exp $"); |
7368a6c8 | 37 | |
7368a6c8 | 38 | #include "ssh.h" |
42f11eb2 | 39 | #include "ssh1.h" |
40 | #include "ssh2.h" | |
41 | #include "xmalloc.h" | |
1729c161 | 42 | #include "sshpty.h" |
7368a6c8 | 43 | #include "packet.h" |
44 | #include "buffer.h" | |
61a2c1da | 45 | #include "match.h" |
7368a6c8 | 46 | #include "mpaux.h" |
7368a6c8 | 47 | #include "uidswap.h" |
48 | #include "compat.h" | |
a5efa1bb | 49 | #include "channels.h" |
e78a59f5 | 50 | #include "bufaux.h" |
e78a59f5 | 51 | #include "auth.h" |
38c295d6 | 52 | #include "auth-options.h" |
42f11eb2 | 53 | #include "pathnames.h" |
54 | #include "log.h" | |
55 | #include "servconf.h" | |
1729c161 | 56 | #include "sshlogin.h" |
42f11eb2 | 57 | #include "serverloop.h" |
58 | #include "canohost.h" | |
5ca51e19 | 59 | #include "session.h" |
1853d1ef | 60 | #include "monitor_wrap.h" |
e78a59f5 | 61 | |
bcfcc5f9 | 62 | #if defined(KRB5) && defined(USE_AFS) |
39dfceeb | 63 | #include <kafs.h> |
64 | #endif | |
65 | ||
7364bd04 | 66 | #ifdef GSSAPI |
67 | #include "ssh-gss.h" | |
68 | #endif | |
69 | ||
7368a6c8 | 70 | /* func */ |
71 | ||
72 | Session *session_new(void); | |
9c328529 | 73 | void session_set_fds(Session *, int, int, int); |
2362db19 | 74 | void session_pty_cleanup(Session *); |
9c328529 | 75 | void session_proctitle(Session *); |
76 | int session_setup_x11fwd(Session *); | |
77 | void do_exec_pty(Session *, const char *); | |
78 | void do_exec_no_pty(Session *, const char *); | |
79 | void do_exec(Session *, const char *); | |
80 | void do_login(Session *, const char *); | |
8a9ac95d | 81 | #ifdef LOGIN_NEEDS_UTMPX |
82 | static void do_pre_login(Session *s); | |
83 | #endif | |
9c328529 | 84 | void do_child(Session *, const char *); |
f2c2fd71 | 85 | void do_motd(void); |
9c328529 | 86 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 87 | |
396c147e | 88 | static void do_authenticated1(Authctxt *); |
89 | static void do_authenticated2(Authctxt *); | |
9c328529 | 90 | |
396c147e | 91 | static int session_pty_req(Session *); |
bb5639fe | 92 | |
7368a6c8 | 93 | /* import */ |
94 | extern ServerOptions options; | |
95 | extern char *__progname; | |
96 | extern int log_stderr; | |
97 | extern int debug_flag; | |
1e3b8b07 | 98 | extern u_int utmp_len; |
089fbbd2 | 99 | extern int startup_pipe; |
e78e738a | 100 | extern void destroy_sensitive_data(void); |
bc7dfc06 | 101 | extern Buffer loginmsg; |
089fbbd2 | 102 | |
b5e300c2 | 103 | /* original command from peer. */ |
c95add71 | 104 | const char *original_command = NULL; |
b5e300c2 | 105 | |
7368a6c8 | 106 | /* data */ |
107 | #define MAX_SESSIONS 10 | |
108 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 109 | |
2e73a022 | 110 | #ifdef HAVE_LOGIN_CAP |
1836f69f | 111 | login_cap_t *lc; |
2e73a022 | 112 | #endif |
113 | ||
2362db19 | 114 | static int is_child = 0; |
115 | ||
149cdb60 | 116 | /* Name and directory of socket for authentication agent forwarding. */ |
117 | static char *auth_sock_name = NULL; | |
118 | static char *auth_sock_dir = NULL; | |
119 | ||
120 | /* removes the agent forwarding socket */ | |
121 | ||
122 | static void | |
2362db19 | 123 | auth_sock_cleanup_proc(struct passwd *pw) |
149cdb60 | 124 | { |
149cdb60 | 125 | if (auth_sock_name != NULL) { |
126 | temporarily_use_uid(pw); | |
127 | unlink(auth_sock_name); | |
128 | rmdir(auth_sock_dir); | |
129 | auth_sock_name = NULL; | |
130 | restore_uid(); | |
131 | } | |
132 | } | |
133 | ||
134 | static int | |
135 | auth_input_request_forwarding(struct passwd * pw) | |
136 | { | |
137 | Channel *nc; | |
138 | int sock; | |
139 | struct sockaddr_un sunaddr; | |
140 | ||
141 | if (auth_sock_name != NULL) { | |
142 | error("authentication forwarding requested twice."); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
147 | temporarily_use_uid(pw); | |
148 | ||
149 | /* Allocate a buffer for the socket name, and format the name. */ | |
150 | auth_sock_name = xmalloc(MAXPATHLEN); | |
151 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
c88de854 | 152 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
149cdb60 | 153 | |
154 | /* Create private directory for socket */ | |
155 | if (mkdtemp(auth_sock_dir) == NULL) { | |
156 | packet_send_debug("Agent forwarding disabled: " | |
157 | "mkdtemp() failed: %.100s", strerror(errno)); | |
158 | restore_uid(); | |
159 | xfree(auth_sock_name); | |
160 | xfree(auth_sock_dir); | |
161 | auth_sock_name = NULL; | |
162 | auth_sock_dir = NULL; | |
163 | return 0; | |
164 | } | |
c457707e | 165 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
166 | auth_sock_dir, (long) getpid()); | |
149cdb60 | 167 | |
149cdb60 | 168 | /* Create the socket. */ |
169 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
170 | if (sock < 0) | |
171 | packet_disconnect("socket: %.100s", strerror(errno)); | |
172 | ||
173 | /* Bind it to the name. */ | |
174 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
175 | sunaddr.sun_family = AF_UNIX; | |
176 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
177 | ||
178 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
179 | packet_disconnect("bind: %.100s", strerror(errno)); | |
180 | ||
181 | /* Restore the privileged uid. */ | |
182 | restore_uid(); | |
183 | ||
184 | /* Start listening on the socket. */ | |
fce39749 | 185 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
149cdb60 | 186 | packet_disconnect("listen: %.100s", strerror(errno)); |
187 | ||
188 | /* Allocate a channel for the authentication agent socket. */ | |
189 | nc = channel_new("auth socket", | |
190 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
191 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 192 | 0, "auth socket", 1); |
149cdb60 | 193 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
194 | return 1; | |
195 | } | |
196 | ||
dd1fb864 | 197 | static void |
198 | display_loginmsg(void) | |
199 | { | |
200 | if (buffer_len(&loginmsg) > 0) { | |
201 | buffer_append(&loginmsg, "\0", 1); | |
202 | printf("%s\n", (char *)buffer_ptr(&loginmsg)); | |
203 | buffer_clear(&loginmsg); | |
204 | } | |
e7d0f139 | 205 | fflush(stdout); |
dd1fb864 | 206 | } |
149cdb60 | 207 | |
bb5639fe | 208 | void |
209 | do_authenticated(Authctxt *authctxt) | |
210 | { | |
381b021b | 211 | setproctitle("%s", authctxt->pw->pw_name); |
212 | ||
bb5639fe | 213 | /* |
214 | * Cancel the alarm we set to limit the time taken for | |
215 | * authentication. | |
216 | */ | |
217 | alarm(0); | |
218 | if (startup_pipe != -1) { | |
219 | close(startup_pipe); | |
220 | startup_pipe = -1; | |
221 | } | |
bb5639fe | 222 | /* setup the channel layer */ |
223 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
224 | channel_permit_all_opens(); | |
225 | ||
226 | if (compat20) | |
227 | do_authenticated2(authctxt); | |
228 | else | |
229 | do_authenticated1(authctxt); | |
e4f7282d | 230 | |
2362db19 | 231 | do_cleanup(authctxt); |
bb5639fe | 232 | } |
233 | ||
7368a6c8 | 234 | /* |
235 | * Prepares for an interactive session. This is called after the user has | |
236 | * been successfully authenticated. During this message exchange, pseudo | |
237 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
238 | * are requested, etc. | |
239 | */ | |
396c147e | 240 | static void |
bb5639fe | 241 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 242 | { |
243 | Session *s; | |
7368a6c8 | 244 | char *command; |
54a5250f | 245 | int success, type, screen_flag; |
7138ebd9 | 246 | int enable_compression_after_reply = 0; |
247 | u_int proto_len, data_len, dlen, compression_level = 0; | |
7368a6c8 | 248 | |
249 | s = session_new(); | |
ced49be2 | 250 | s->authctxt = authctxt; |
bb5639fe | 251 | s->pw = authctxt->pw; |
2e73a022 | 252 | |
7368a6c8 | 253 | /* |
254 | * We stay in this loop until the client requests to execute a shell | |
255 | * or a command. | |
256 | */ | |
257 | for (;;) { | |
bb5639fe | 258 | success = 0; |
7368a6c8 | 259 | |
260 | /* Get a packet from the client. */ | |
54a5250f | 261 | type = packet_read(); |
7368a6c8 | 262 | |
263 | /* Process the packet. */ | |
264 | switch (type) { | |
265 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 266 | compression_level = packet_get_int(); |
95500969 | 267 | packet_check_eom(); |
7368a6c8 | 268 | if (compression_level < 1 || compression_level > 9) { |
269 | packet_send_debug("Received illegal compression level %d.", | |
184eed6a | 270 | compression_level); |
7368a6c8 | 271 | break; |
272 | } | |
636f76ca | 273 | if (!options.compression) { |
274 | debug2("compression disabled"); | |
275 | break; | |
276 | } | |
7368a6c8 | 277 | /* Enable compression after we have responded with SUCCESS. */ |
278 | enable_compression_after_reply = 1; | |
279 | success = 1; | |
280 | break; | |
281 | ||
282 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 283 | success = session_pty_req(s); |
7368a6c8 | 284 | break; |
285 | ||
286 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 287 | s->auth_proto = packet_get_string(&proto_len); |
288 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 289 | |
2af09193 | 290 | screen_flag = packet_get_protocol_flags() & |
291 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
292 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
293 | ||
294 | if (packet_remaining() == 4) { | |
295 | if (!screen_flag) | |
296 | debug2("Buggy client: " | |
297 | "X11 screen flag missing"); | |
7368a6c8 | 298 | s->screen = packet_get_int(); |
c8b058b4 | 299 | } else { |
7368a6c8 | 300 | s->screen = 0; |
c8b058b4 | 301 | } |
95500969 | 302 | packet_check_eom(); |
8dcd9d5c | 303 | success = session_setup_x11fwd(s); |
304 | if (!success) { | |
305 | xfree(s->auth_proto); | |
306 | xfree(s->auth_data); | |
1500bcdd | 307 | s->auth_proto = NULL; |
308 | s->auth_data = NULL; | |
7368a6c8 | 309 | } |
7368a6c8 | 310 | break; |
7368a6c8 | 311 | |
312 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
313 | if (no_agent_forwarding_flag || compat13) { | |
314 | debug("Authentication agent forwarding not permitted for this authentication."); | |
315 | break; | |
316 | } | |
317 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 318 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 319 | break; |
320 | ||
321 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
322 | if (no_port_forwarding_flag) { | |
323 | debug("Port forwarding not permitted for this authentication."); | |
324 | break; | |
325 | } | |
33de75a3 | 326 | if (!options.allow_tcp_forwarding) { |
327 | debug("Port forwarding not permitted."); | |
328 | break; | |
329 | } | |
7368a6c8 | 330 | debug("Received TCP/IP port forwarding request."); |
bb5639fe | 331 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 332 | success = 1; |
333 | break; | |
334 | ||
335 | case SSH_CMSG_MAX_PACKET_SIZE: | |
336 | if (packet_set_maxsize(packet_get_int()) > 0) | |
337 | success = 1; | |
338 | break; | |
184eed6a | 339 | |
7368a6c8 | 340 | case SSH_CMSG_EXEC_SHELL: |
341 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 342 | if (type == SSH_CMSG_EXEC_CMD) { |
343 | command = packet_get_string(&dlen); | |
344 | debug("Exec command '%.500s'", command); | |
c95add71 | 345 | do_exec(s, command); |
346 | xfree(command); | |
7368a6c8 | 347 | } else { |
c95add71 | 348 | do_exec(s, NULL); |
7368a6c8 | 349 | } |
95500969 | 350 | packet_check_eom(); |
fc2a1d28 | 351 | session_close(s); |
7368a6c8 | 352 | return; |
353 | ||
354 | default: | |
355 | /* | |
356 | * Any unknown messages in this phase are ignored, | |
357 | * and a failure message is returned. | |
358 | */ | |
bbe88b6d | 359 | logit("Unknown packet type received after authentication: %d", type); |
7368a6c8 | 360 | } |
361 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
362 | packet_send(); | |
363 | packet_write_wait(); | |
364 | ||
365 | /* Enable compression now that we have replied if appropriate. */ | |
366 | if (enable_compression_after_reply) { | |
367 | enable_compression_after_reply = 0; | |
368 | packet_start_compression(compression_level); | |
369 | } | |
370 | } | |
371 | } | |
372 | ||
373 | /* | |
374 | * This is called to fork and execute a command when we have no tty. This | |
375 | * will call do_child from the child, and server_loop from the parent after | |
376 | * setting up file descriptors and such. | |
377 | */ | |
6ae2364d | 378 | void |
65068d16 | 379 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 380 | { |
c457707e | 381 | pid_t pid; |
7368a6c8 | 382 | |
383 | #ifdef USE_PIPES | |
384 | int pin[2], pout[2], perr[2]; | |
385 | /* Allocate pipes for communicating with the program. */ | |
386 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
387 | packet_disconnect("Could not create pipes: %.100s", | |
388 | strerror(errno)); | |
389 | #else /* USE_PIPES */ | |
390 | int inout[2], err[2]; | |
391 | /* Uses socket pairs to communicate with the program. */ | |
392 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
393 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
394 | packet_disconnect("Could not create socket pairs: %.100s", | |
395 | strerror(errno)); | |
396 | #endif /* USE_PIPES */ | |
397 | if (s == NULL) | |
398 | fatal("do_exec_no_pty: no session"); | |
399 | ||
1d1ffb87 | 400 | session_proctitle(s); |
7368a6c8 | 401 | |
b19d61d7 | 402 | #if defined(USE_PAM) |
59f327e0 | 403 | if (options.use_pam && !use_privsep) |
7fceb20d | 404 | do_pam_setcred(1); |
266140a8 | 405 | #endif /* USE_PAM */ |
406 | ||
7368a6c8 | 407 | /* Fork the child. */ |
408 | if ((pid = fork()) == 0) { | |
2362db19 | 409 | is_child = 1; |
516f0d7d | 410 | |
7368a6c8 | 411 | /* Child. Reinitialize the log since the pid has changed. */ |
412 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
413 | ||
414 | /* | |
415 | * Create a new session and process group since the 4.4BSD | |
416 | * setlogin() affects the entire process group. | |
417 | */ | |
418 | if (setsid() < 0) | |
419 | error("setsid failed: %.100s", strerror(errno)); | |
420 | ||
421 | #ifdef USE_PIPES | |
422 | /* | |
423 | * Redirect stdin. We close the parent side of the socket | |
424 | * pair, and make the child side the standard input. | |
425 | */ | |
426 | close(pin[1]); | |
427 | if (dup2(pin[0], 0) < 0) | |
428 | perror("dup2 stdin"); | |
429 | close(pin[0]); | |
430 | ||
431 | /* Redirect stdout. */ | |
432 | close(pout[0]); | |
433 | if (dup2(pout[1], 1) < 0) | |
434 | perror("dup2 stdout"); | |
435 | close(pout[1]); | |
436 | ||
437 | /* Redirect stderr. */ | |
438 | close(perr[0]); | |
439 | if (dup2(perr[1], 2) < 0) | |
440 | perror("dup2 stderr"); | |
441 | close(perr[1]); | |
442 | #else /* USE_PIPES */ | |
443 | /* | |
444 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
445 | * use the same socket, as some programs (particularly rdist) | |
446 | * seem to depend on it. | |
447 | */ | |
448 | close(inout[1]); | |
449 | close(err[1]); | |
450 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
451 | perror("dup2 stdin"); | |
452 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
453 | perror("dup2 stdout"); | |
454 | if (dup2(err[0], 2) < 0) /* stderr */ | |
455 | perror("dup2 stderr"); | |
456 | #endif /* USE_PIPES */ | |
457 | ||
ef51930f | 458 | #ifdef _UNICOS |
459 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
460 | #endif | |
461 | ||
7368a6c8 | 462 | /* Do processing for the child (exec command etc). */ |
56b3e9ce | 463 | do_child(s, command); |
7368a6c8 | 464 | /* NOTREACHED */ |
465 | } | |
ef51930f | 466 | #ifdef _UNICOS |
467 | signal(WJSIGNAL, cray_job_termination_handler); | |
468 | #endif /* _UNICOS */ | |
3c62e7eb | 469 | #ifdef HAVE_CYGWIN |
470 | if (is_winnt) | |
471 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
472 | #endif | |
7368a6c8 | 473 | if (pid < 0) |
474 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
475 | s->pid = pid; | |
b5c334cc | 476 | /* Set interactive/non-interactive mode. */ |
477 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 478 | #ifdef USE_PIPES |
479 | /* We are the parent. Close the child sides of the pipes. */ | |
480 | close(pin[0]); | |
481 | close(pout[1]); | |
482 | close(perr[1]); | |
483 | ||
e78a59f5 | 484 | if (compat20) { |
e5d7a405 | 485 | session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); |
e78a59f5 | 486 | } else { |
487 | /* Enter the interactive session. */ | |
488 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 489 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 490 | } |
7368a6c8 | 491 | #else /* USE_PIPES */ |
492 | /* We are the parent. Close the child sides of the socket pairs. */ | |
493 | close(inout[0]); | |
494 | close(err[0]); | |
495 | ||
75dbfa01 | 496 | /* |
497 | * Clear loginmsg, since it's the child's responsibility to display | |
498 | * it to the user, otherwise multiple sessions may accumulate | |
499 | * multiple copies of the login messages. | |
500 | */ | |
501 | buffer_clear(&loginmsg); | |
502 | ||
7368a6c8 | 503 | /* |
504 | * Enter the interactive session. Note: server_loop must be able to | |
505 | * handle the case that fdin and fdout are the same. | |
506 | */ | |
e78a59f5 | 507 | if (compat20) { |
e5d7a405 | 508 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 509 | } else { |
510 | server_loop(pid, inout[1], inout[1], err[1]); | |
511 | /* server_loop has closed inout[1] and err[1]. */ | |
512 | } | |
7368a6c8 | 513 | #endif /* USE_PIPES */ |
514 | } | |
515 | ||
516 | /* | |
517 | * This is called to fork and execute a command when we have a tty. This | |
518 | * will call do_child from the child, and server_loop from the parent after | |
519 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
520 | * lastlog, and other such operations. | |
521 | */ | |
6ae2364d | 522 | void |
65068d16 | 523 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 524 | { |
7368a6c8 | 525 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 526 | pid_t pid; |
7368a6c8 | 527 | |
528 | if (s == NULL) | |
529 | fatal("do_exec_pty: no session"); | |
530 | ptyfd = s->ptyfd; | |
531 | ttyfd = s->ttyfd; | |
532 | ||
b19d61d7 | 533 | #if defined(USE_PAM) |
7fceb20d | 534 | if (options.use_pam) { |
49e82bb9 | 535 | do_pam_set_tty(s->tty); |
72037bc8 | 536 | if (!use_privsep) |
537 | do_pam_setcred(1); | |
7fceb20d | 538 | } |
27cf96de | 539 | #endif |
266140a8 | 540 | |
7368a6c8 | 541 | /* Fork the child. */ |
542 | if ((pid = fork()) == 0) { | |
2362db19 | 543 | is_child = 1; |
57156994 | 544 | |
c345cf9d | 545 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 546 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 547 | /* Close the master side of the pseudo tty. */ |
548 | close(ptyfd); | |
549 | ||
550 | /* Make the pseudo tty our controlling tty. */ | |
551 | pty_make_controlling_tty(&ttyfd, s->tty); | |
552 | ||
05fd093c | 553 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
554 | if (dup2(ttyfd, 0) < 0) | |
555 | error("dup2 stdin: %s", strerror(errno)); | |
556 | if (dup2(ttyfd, 1) < 0) | |
557 | error("dup2 stdout: %s", strerror(errno)); | |
558 | if (dup2(ttyfd, 2) < 0) | |
559 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 560 | |
561 | /* Close the extra descriptor for the pseudo tty. */ | |
562 | close(ttyfd); | |
563 | ||
c345cf9d | 564 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 565 | #ifndef HAVE_OSF_SIA |
ef51930f | 566 | if (!(options.use_login && command == NULL)) { |
567 | #ifdef _UNICOS | |
568 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
569 | #endif /* _UNICOS */ | |
a22aff1f | 570 | do_login(s, command); |
ef51930f | 571 | } |
7e2d5fa4 | 572 | # ifdef LOGIN_NEEDS_UTMPX |
573 | else | |
574 | do_pre_login(s); | |
575 | # endif | |
c96a4aaf | 576 | #endif |
7368a6c8 | 577 | |
7368a6c8 | 578 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 579 | do_child(s, command); |
7368a6c8 | 580 | /* NOTREACHED */ |
581 | } | |
ef51930f | 582 | #ifdef _UNICOS |
583 | signal(WJSIGNAL, cray_job_termination_handler); | |
584 | #endif /* _UNICOS */ | |
3c62e7eb | 585 | #ifdef HAVE_CYGWIN |
586 | if (is_winnt) | |
587 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
588 | #endif | |
7368a6c8 | 589 | if (pid < 0) |
590 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
591 | s->pid = pid; | |
592 | ||
593 | /* Parent. Close the slave side of the pseudo tty. */ | |
594 | close(ttyfd); | |
595 | ||
596 | /* | |
597 | * Create another descriptor of the pty master side for use as the | |
598 | * standard input. We could use the original descriptor, but this | |
599 | * simplifies code in server_loop. The descriptor is bidirectional. | |
600 | */ | |
601 | fdout = dup(ptyfd); | |
602 | if (fdout < 0) | |
603 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
604 | ||
605 | /* we keep a reference to the pty master */ | |
606 | ptymaster = dup(ptyfd); | |
607 | if (ptymaster < 0) | |
608 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
609 | s->ptymaster = ptymaster; | |
610 | ||
611 | /* Enter interactive session. */ | |
b5c334cc | 612 | packet_set_interactive(1); |
e78a59f5 | 613 | if (compat20) { |
614 | session_set_fds(s, ptyfd, fdout, -1); | |
615 | } else { | |
616 | server_loop(pid, ptyfd, fdout, -1); | |
617 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 618 | } |
7368a6c8 | 619 | } |
620 | ||
7e2d5fa4 | 621 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 622 | static void |
7e2d5fa4 | 623 | do_pre_login(Session *s) |
624 | { | |
625 | socklen_t fromlen; | |
626 | struct sockaddr_storage from; | |
627 | pid_t pid = getpid(); | |
628 | ||
629 | /* | |
630 | * Get IP address of client. If the connection is not a socket, let | |
631 | * the address be 0.0.0.0. | |
632 | */ | |
633 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 634 | fromlen = sizeof(from); |
7e2d5fa4 | 635 | if (packet_connection_is_on_socket()) { |
7e2d5fa4 | 636 | if (getpeername(packet_get_connection_in(), |
184eed6a | 637 | (struct sockaddr *) & from, &fromlen) < 0) { |
7e2d5fa4 | 638 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 639 | cleanup_exit(255); |
7e2d5fa4 | 640 | } |
641 | } | |
642 | ||
643 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
c5a7d788 | 644 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d4ac26ed | 645 | (struct sockaddr *)&from, fromlen); |
7e2d5fa4 | 646 | } |
647 | #endif | |
648 | ||
dac6753b | 649 | /* |
650 | * This is called to fork and execute a command. If another command is | |
651 | * to be forced, execute that instead. | |
652 | */ | |
653 | void | |
654 | do_exec(Session *s, const char *command) | |
655 | { | |
656 | if (forced_command) { | |
657 | original_command = command; | |
658 | command = forced_command; | |
dac6753b | 659 | debug("Forced command '%.900s'", command); |
660 | } | |
661 | ||
f89f8ddc | 662 | #ifdef GSSAPI |
663 | if (options.gss_authentication) { | |
664 | temporarily_use_uid(s->pw); | |
665 | ssh_gssapi_storecreds(); | |
666 | restore_uid(); | |
667 | } | |
668 | #endif | |
669 | ||
dac6753b | 670 | if (s->ttyfd != -1) |
671 | do_exec_pty(s, command); | |
672 | else | |
673 | do_exec_no_pty(s, command); | |
674 | ||
c95add71 | 675 | original_command = NULL; |
dac6753b | 676 | } |
677 | ||
f7342052 | 678 | |
c345cf9d | 679 | /* administrative, login(1)-like work */ |
680 | void | |
a22aff1f | 681 | do_login(Session *s, const char *command) |
c345cf9d | 682 | { |
c345cf9d | 683 | char *time_string; |
c345cf9d | 684 | socklen_t fromlen; |
685 | struct sockaddr_storage from; | |
c345cf9d | 686 | struct passwd * pw = s->pw; |
687 | pid_t pid = getpid(); | |
688 | ||
689 | /* | |
690 | * Get IP address of client. If the connection is not a socket, let | |
691 | * the address be 0.0.0.0. | |
692 | */ | |
693 | memset(&from, 0, sizeof(from)); | |
d4ac26ed | 694 | fromlen = sizeof(from); |
c345cf9d | 695 | if (packet_connection_is_on_socket()) { |
c345cf9d | 696 | if (getpeername(packet_get_connection_in(), |
f7342052 | 697 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 698 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 699 | cleanup_exit(255); |
c345cf9d | 700 | } |
701 | } | |
702 | ||
703 | /* Record that there was a login on that tty from the remote host. */ | |
49a34e84 | 704 | if (!use_privsep) |
705 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
706 | get_remote_name_or_ip(utmp_len, | |
c5a7d788 | 707 | options.use_dns), |
ba1566dd | 708 | (struct sockaddr *)&from, fromlen); |
c345cf9d | 709 | |
2919e060 | 710 | #ifdef USE_PAM |
711 | /* | |
712 | * If password change is needed, do it now. | |
713 | * This needs to occur before the ~/.hushlogin check. | |
714 | */ | |
dd1fb864 | 715 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
716 | display_loginmsg(); | |
2919e060 | 717 | do_pam_chauthtok(); |
dd1fb864 | 718 | s->authctxt->force_pwchange = 0; |
5b9e2464 | 719 | /* XXX - signal [net] parent to enable forwardings */ |
2919e060 | 720 | } |
721 | #endif | |
722 | ||
f2c2fd71 | 723 | if (check_quietlogin(s, command)) |
c345cf9d | 724 | return; |
725 | ||
dd1fb864 | 726 | display_loginmsg(); |
c345cf9d | 727 | |
ef51930f | 728 | #ifndef NO_SSH_LASTLOG |
ffbf7323 | 729 | if (options.print_lastlog && s->last_login_time != 0) { |
730 | time_string = ctime(&s->last_login_time); | |
c345cf9d | 731 | if (strchr(time_string, '\n')) |
732 | *strchr(time_string, '\n') = 0; | |
ffbf7323 | 733 | if (strcmp(s->hostname, "") == 0) |
c345cf9d | 734 | printf("Last login: %s\r\n", time_string); |
735 | else | |
ffbf7323 | 736 | printf("Last login: %s from %s\r\n", time_string, |
737 | s->hostname); | |
c345cf9d | 738 | } |
ef51930f | 739 | #endif /* NO_SSH_LASTLOG */ |
f2c2fd71 | 740 | |
741 | do_motd(); | |
742 | } | |
743 | ||
744 | /* | |
745 | * Display the message of the day. | |
746 | */ | |
747 | void | |
748 | do_motd(void) | |
749 | { | |
750 | FILE *f; | |
751 | char buf[256]; | |
752 | ||
c345cf9d | 753 | if (options.print_motd) { |
2e73a022 | 754 | #ifdef HAVE_LOGIN_CAP |
755 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
756 | "/etc/motd"), "r"); | |
757 | #else | |
c345cf9d | 758 | f = fopen("/etc/motd", "r"); |
2e73a022 | 759 | #endif |
c345cf9d | 760 | if (f) { |
761 | while (fgets(buf, sizeof(buf), f)) | |
762 | fputs(buf, stdout); | |
763 | fclose(f); | |
764 | } | |
765 | } | |
766 | } | |
767 | ||
9c328529 | 768 | |
769 | /* | |
770 | * Check for quiet login, either .hushlogin or command given. | |
771 | */ | |
772 | int | |
773 | check_quietlogin(Session *s, const char *command) | |
774 | { | |
775 | char buf[256]; | |
776 | struct passwd *pw = s->pw; | |
777 | struct stat st; | |
778 | ||
779 | /* Return 1 if .hushlogin exists or a command given. */ | |
780 | if (command != NULL) | |
781 | return 1; | |
782 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
783 | #ifdef HAVE_LOGIN_CAP | |
784 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
785 | return 1; | |
786 | #else | |
787 | if (stat(buf, &st) >= 0) | |
788 | return 1; | |
789 | #endif | |
790 | return 0; | |
791 | } | |
792 | ||
7368a6c8 | 793 | /* |
794 | * Sets the value of the given variable in the environment. If the variable | |
795 | * already exists, its value is overriden. | |
796 | */ | |
7364bd04 | 797 | void |
1e3b8b07 | 798 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
184eed6a | 799 | const char *value) |
7368a6c8 | 800 | { |
7368a6c8 | 801 | char **env; |
c46e584f | 802 | u_int envsize; |
803 | u_int i, namelen; | |
7368a6c8 | 804 | |
95b99395 | 805 | /* |
806 | * If we're passed an uninitialized list, allocate a single null | |
807 | * entry before continuing. | |
808 | */ | |
809 | if (*envp == NULL && *envsizep == 0) { | |
810 | *envp = xmalloc(sizeof(char *)); | |
811 | *envp[0] = NULL; | |
812 | *envsizep = 1; | |
813 | } | |
814 | ||
7368a6c8 | 815 | /* |
816 | * Find the slot where the value should be stored. If the variable | |
817 | * already exists, we reuse the slot; otherwise we append a new slot | |
818 | * at the end of the array, expanding if necessary. | |
819 | */ | |
820 | env = *envp; | |
821 | namelen = strlen(name); | |
822 | for (i = 0; env[i]; i++) | |
823 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
824 | break; | |
825 | if (env[i]) { | |
826 | /* Reuse the slot. */ | |
827 | xfree(env[i]); | |
828 | } else { | |
829 | /* New variable. Expand if necessary. */ | |
c46e584f | 830 | envsize = *envsizep; |
831 | if (i >= envsize - 1) { | |
832 | if (envsize >= 1000) | |
833 | fatal("child_set_env: too many env vars"); | |
834 | envsize += 50; | |
835 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); | |
836 | *envsizep = envsize; | |
7368a6c8 | 837 | } |
838 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
839 | env[i + 1] = NULL; | |
840 | } | |
841 | ||
842 | /* Allocate space and format the variable in the appropriate slot. */ | |
843 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
844 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
845 | } | |
846 | ||
847 | /* | |
848 | * Reads environment variables from the given file and adds/overrides them | |
849 | * into the environment. If the file does not exist, this does nothing. | |
850 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
851 | * and assignments of the form name=value. No other forms are allowed. | |
852 | */ | |
396c147e | 853 | static void |
1e3b8b07 | 854 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 855 | const char *filename) |
7368a6c8 | 856 | { |
857 | FILE *f; | |
858 | char buf[4096]; | |
859 | char *cp, *value; | |
66087567 | 860 | u_int lineno = 0; |
7368a6c8 | 861 | |
862 | f = fopen(filename, "r"); | |
863 | if (!f) | |
864 | return; | |
865 | ||
866 | while (fgets(buf, sizeof(buf), f)) { | |
66087567 | 867 | if (++lineno > 1000) |
868 | fatal("Too many lines in environment file %s", filename); | |
7368a6c8 | 869 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
870 | ; | |
871 | if (!*cp || *cp == '#' || *cp == '\n') | |
872 | continue; | |
873 | if (strchr(cp, '\n')) | |
874 | *strchr(cp, '\n') = '\0'; | |
875 | value = strchr(cp, '='); | |
876 | if (value == NULL) { | |
66087567 | 877 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
878 | filename); | |
7368a6c8 | 879 | continue; |
880 | } | |
71276795 | 881 | /* |
882 | * Replace the equals sign by nul, and advance value to | |
883 | * the value string. | |
884 | */ | |
7368a6c8 | 885 | *value = '\0'; |
886 | value++; | |
887 | child_set_env(env, envsize, cp, value); | |
888 | } | |
889 | fclose(f); | |
890 | } | |
891 | ||
95b99395 | 892 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
893 | /* | |
894 | * Return named variable from specified environment, or NULL if not present. | |
895 | */ | |
896 | static char * | |
897 | child_get_env(char **env, const char *name) | |
898 | { | |
899 | int i; | |
900 | size_t len; | |
901 | ||
902 | len = strlen(name); | |
903 | for (i=0; env[i] != NULL; i++) | |
904 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
905 | return(env[i] + len + 1); | |
906 | return NULL; | |
907 | } | |
908 | ||
909 | /* | |
910 | * Read /etc/default/login. | |
911 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
912 | */ | |
913 | static void | |
914 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
915 | { | |
916 | char **tmpenv = NULL, *var; | |
6f99680f | 917 | u_int i, tmpenvsize = 0; |
3a23ba0e | 918 | u_long mask; |
95b99395 | 919 | |
920 | /* | |
921 | * We don't want to copy the whole file to the child's environment, | |
922 | * so we use a temporary environment and copy the variables we're | |
923 | * interested in. | |
924 | */ | |
925 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
926 | ||
6f99680f | 927 | if (tmpenv == NULL) |
928 | return; | |
929 | ||
95b99395 | 930 | if (uid == 0) |
931 | var = child_get_env(tmpenv, "SUPATH"); | |
932 | else | |
933 | var = child_get_env(tmpenv, "PATH"); | |
934 | if (var != NULL) | |
935 | child_set_env(env, envsize, "PATH", var); | |
b6453d99 | 936 | |
95b99395 | 937 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
938 | if (sscanf(var, "%5lo", &mask) == 1) | |
3a23ba0e | 939 | umask((mode_t)mask); |
b6453d99 | 940 | |
95b99395 | 941 | for (i = 0; tmpenv[i] != NULL; i++) |
942 | xfree(tmpenv[i]); | |
943 | xfree(tmpenv); | |
944 | } | |
945 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
946 | ||
760b35a6 | 947 | void copy_environment(char **source, char ***env, u_int *envsize) |
7368a6c8 | 948 | { |
760b35a6 | 949 | char *var_name, *var_val; |
7368a6c8 | 950 | int i; |
951 | ||
760b35a6 | 952 | if (source == NULL) |
7368a6c8 | 953 | return; |
2b87da3b | 954 | |
760b35a6 | 955 | for(i = 0; source[i] != NULL; i++) { |
956 | var_name = xstrdup(source[i]); | |
957 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
958 | xfree(var_name); | |
7368a6c8 | 959 | continue; |
7368a6c8 | 960 | } |
760b35a6 | 961 | *var_val++ = '\0'; |
7368a6c8 | 962 | |
760b35a6 | 963 | debug3("Copy environment: %s=%s", var_name, var_val); |
964 | child_set_env(env, envsize, var_name, var_val); | |
b6453d99 | 965 | |
760b35a6 | 966 | xfree(var_name); |
22d89d24 | 967 | } |
968 | } | |
22d89d24 | 969 | |
f7342052 | 970 | static char ** |
971 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 972 | { |
7368a6c8 | 973 | char buf[256]; |
f7342052 | 974 | u_int i, envsize; |
95b99395 | 975 | char **env, *laddr, *path = NULL; |
f7342052 | 976 | struct passwd *pw = s->pw; |
7368a6c8 | 977 | |
7368a6c8 | 978 | /* Initialize the environment. */ |
979 | envsize = 100; | |
980 | env = xmalloc(envsize * sizeof(char *)); | |
981 | env[0] = NULL; | |
982 | ||
3c62e7eb | 983 | #ifdef HAVE_CYGWIN |
984 | /* | |
985 | * The Windows environment contains some setting which are | |
986 | * important for a running system. They must not be dropped. | |
987 | */ | |
760b35a6 | 988 | copy_environment(environ, &env, &envsize); |
3c62e7eb | 989 | #endif |
990 | ||
7364bd04 | 991 | #ifdef GSSAPI |
aff51935 | 992 | /* Allow any GSSAPI methods that we've used to alter |
7364bd04 | 993 | * the childs environment as they see fit |
994 | */ | |
995 | ssh_gssapi_do_child(&env, &envsize); | |
996 | #endif | |
997 | ||
7368a6c8 | 998 | if (!options.use_login) { |
999 | /* Set basic environment. */ | |
61a2c1da | 1000 | for (i = 0; i < s->num_env; i++) |
1001 | child_set_env(&env, &envsize, s->env[i].name, | |
1002 | s->env[i].val); | |
1003 | ||
7368a6c8 | 1004 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1005 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
17ed08c5 | 1006 | #ifdef _AIX |
1007 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1008 | #endif | |
7368a6c8 | 1009 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
2e73a022 | 1010 | #ifdef HAVE_LOGIN_CAP |
97686bf9 | 1011 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1012 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1013 | else | |
1014 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1015 | #else /* HAVE_LOGIN_CAP */ |
1016 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1017 | /* |
1018 | * There's no standard path on Windows. The path contains | |
1019 | * important components pointing to the system directories, | |
1020 | * needed for loading shared libraries. So the path better | |
1021 | * remains intact here. | |
1022 | */ | |
95b99395 | 1023 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1024 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1025 | path = child_get_env(env, "PATH"); | |
1026 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1027 | if (path == NULL || *path == '\0') { | |
aff51935 | 1028 | child_set_env(&env, &envsize, "PATH", |
95b99395 | 1029 | s->pw->pw_uid == 0 ? |
1030 | SUPERUSER_PATH : _PATH_STDPATH); | |
1031 | } | |
22d89d24 | 1032 | # endif /* HAVE_CYGWIN */ |
1033 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1034 | |
1035 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1036 | _PATH_MAILDIR, pw->pw_name); | |
1037 | child_set_env(&env, &envsize, "MAIL", buf); | |
1038 | ||
1039 | /* Normal systems set SHELL by default. */ | |
1040 | child_set_env(&env, &envsize, "SHELL", shell); | |
1041 | } | |
1042 | if (getenv("TZ")) | |
1043 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1044 | ||
1045 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 1046 | if (!options.use_login) { |
1047 | while (custom_environment) { | |
1048 | struct envstring *ce = custom_environment; | |
7fdc56c5 | 1049 | char *str = ce->s; |
f7342052 | 1050 | |
7fdc56c5 | 1051 | for (i = 0; str[i] != '=' && str[i]; i++) |
2548961d | 1052 | ; |
7fdc56c5 | 1053 | if (str[i] == '=') { |
1054 | str[i] = 0; | |
1055 | child_set_env(&env, &envsize, str, str + i + 1); | |
2548961d | 1056 | } |
1057 | custom_environment = ce->next; | |
1058 | xfree(ce->s); | |
1059 | xfree(ce); | |
7368a6c8 | 1060 | } |
7368a6c8 | 1061 | } |
1062 | ||
da0561eb | 1063 | /* SSH_CLIENT deprecated */ |
7368a6c8 | 1064 | snprintf(buf, sizeof buf, "%.50s %d %d", |
f7342052 | 1065 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1066 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1067 | ||
3e2f2431 | 1068 | laddr = get_local_ipaddr(packet_get_connection_in()); |
da0561eb | 1069 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
3e2f2431 | 1070 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1071 | xfree(laddr); | |
da0561eb | 1072 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1073 | ||
56b3e9ce | 1074 | if (s->ttyfd != -1) |
1075 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1076 | if (s->term) | |
1077 | child_set_env(&env, &envsize, "TERM", s->term); | |
1078 | if (s->display) | |
1079 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1080 | if (original_command) |
1081 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1082 | original_command); | |
7368a6c8 | 1083 | |
ef51930f | 1084 | #ifdef _UNICOS |
1085 | if (cray_tmpdir[0] != '\0') | |
1086 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1087 | #endif /* _UNICOS */ | |
1088 | ||
7368a6c8 | 1089 | #ifdef _AIX |
4936fcee | 1090 | { |
1091 | char *cp; | |
1092 | ||
1093 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1094 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1095 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1096 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1097 | read_environment_file(&env, &envsize, "/etc/environment"); | |
1098 | } | |
7368a6c8 | 1099 | #endif |
ced49be2 | 1100 | #ifdef KRB5 |
6490a5d5 | 1101 | if (s->authctxt->krb5_ccname) |
ced49be2 | 1102 | child_set_env(&env, &envsize, "KRB5CCNAME", |
6490a5d5 | 1103 | s->authctxt->krb5_ccname); |
ced49be2 | 1104 | #endif |
7368a6c8 | 1105 | #ifdef USE_PAM |
ee48c949 | 1106 | /* |
1107 | * Pull in any environment variables that may have | |
1108 | * been set by PAM. | |
1109 | */ | |
7fceb20d | 1110 | if (options.use_pam) { |
2212fc98 | 1111 | char **p; |
b6453d99 | 1112 | |
2212fc98 | 1113 | p = fetch_pam_child_environment(); |
1114 | copy_environment(p, &env, &envsize); | |
1115 | free_pam_environment(p); | |
ee48c949 | 1116 | |
2212fc98 | 1117 | p = fetch_pam_environment(); |
ee48c949 | 1118 | copy_environment(p, &env, &envsize); |
1119 | free_pam_environment(p); | |
1120 | } | |
7368a6c8 | 1121 | #endif /* USE_PAM */ |
1122 | ||
149cdb60 | 1123 | if (auth_sock_name != NULL) |
7368a6c8 | 1124 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1125 | auth_sock_name); |
7368a6c8 | 1126 | |
1127 | /* read $HOME/.ssh/environment. */ | |
f00bab84 | 1128 | if (options.permit_user_env && !options.use_login) { |
71276795 | 1129 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e2e36358 | 1130 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
7368a6c8 | 1131 | read_environment_file(&env, &envsize, buf); |
1132 | } | |
1133 | if (debug_flag) { | |
1134 | /* dump the environment */ | |
1135 | fprintf(stderr, "Environment:\n"); | |
1136 | for (i = 0; env[i]; i++) | |
1137 | fprintf(stderr, " %.200s\n", env[i]); | |
1138 | } | |
f7342052 | 1139 | return env; |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1144 | * first in this order). | |
1145 | */ | |
1146 | static void | |
1147 | do_rc_files(Session *s, const char *shell) | |
1148 | { | |
1149 | FILE *f = NULL; | |
1150 | char cmd[1024]; | |
1151 | int do_xauth; | |
1152 | struct stat st; | |
1153 | ||
1154 | do_xauth = | |
1155 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1156 | ||
1157 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1158 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1159 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1160 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1161 | if (debug_flag) | |
1162 | fprintf(stderr, "Running %s\n", cmd); | |
1163 | f = popen(cmd, "w"); | |
1164 | if (f) { | |
1165 | if (do_xauth) | |
1166 | fprintf(f, "%s %s\n", s->auth_proto, | |
1167 | s->auth_data); | |
1168 | pclose(f); | |
1169 | } else | |
1170 | fprintf(stderr, "Could not run %s\n", | |
1171 | _PATH_SSH_USER_RC); | |
1172 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1173 | if (debug_flag) | |
1174 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1175 | _PATH_SSH_SYSTEM_RC); | |
1176 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1177 | if (f) { | |
1178 | if (do_xauth) | |
1179 | fprintf(f, "%s %s\n", s->auth_proto, | |
1180 | s->auth_data); | |
1181 | pclose(f); | |
1182 | } else | |
1183 | fprintf(stderr, "Could not run %s\n", | |
1184 | _PATH_SSH_SYSTEM_RC); | |
1185 | } else if (do_xauth && options.xauth_location != NULL) { | |
1186 | /* Add authority data to .Xauthority if appropriate. */ | |
1187 | if (debug_flag) { | |
1188 | fprintf(stderr, | |
fe661d8f | 1189 | "Running %.500s remove %.100s\n", |
2362db19 | 1190 | options.xauth_location, s->auth_display); |
fe661d8f | 1191 | fprintf(stderr, |
1192 | "%.500s add %.100s %.100s %.100s\n", | |
f7342052 | 1193 | options.xauth_location, s->auth_display, |
1194 | s->auth_proto, s->auth_data); | |
1195 | } | |
1196 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1197 | options.xauth_location); | |
1198 | f = popen(cmd, "w"); | |
1199 | if (f) { | |
fe661d8f | 1200 | fprintf(f, "remove %s\n", |
1201 | s->auth_display); | |
f7342052 | 1202 | fprintf(f, "add %s %s %s\n", |
1203 | s->auth_display, s->auth_proto, | |
1204 | s->auth_data); | |
1205 | pclose(f); | |
1206 | } else { | |
1207 | fprintf(stderr, "Could not run %s\n", | |
1208 | cmd); | |
1209 | } | |
1210 | } | |
1211 | } | |
1212 | ||
1213 | static void | |
1214 | do_nologin(struct passwd *pw) | |
1215 | { | |
1216 | FILE *f = NULL; | |
1217 | char buf[1024]; | |
1218 | ||
1219 | #ifdef HAVE_LOGIN_CAP | |
1220 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1221 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1222 | _PATH_NOLOGIN), "r"); | |
1223 | #else | |
1224 | if (pw->pw_uid) | |
1225 | f = fopen(_PATH_NOLOGIN, "r"); | |
1226 | #endif | |
1227 | if (f) { | |
1228 | /* /etc/nologin exists. Print its contents and exit. */ | |
bbe88b6d | 1229 | logit("User %.100s not allowed because %s exists", |
8bd4e2ae | 1230 | pw->pw_name, _PATH_NOLOGIN); |
f7342052 | 1231 | while (fgets(buf, sizeof(buf), f)) |
1232 | fputs(buf, stderr); | |
1233 | fclose(f); | |
99f4fb69 | 1234 | fflush(NULL); |
f7342052 | 1235 | exit(254); |
1236 | } | |
1237 | } | |
1238 | ||
1239 | /* Set login name, uid, gid, and groups. */ | |
1853d1ef | 1240 | void |
f7342052 | 1241 | do_setusercontext(struct passwd *pw) |
1242 | { | |
2731632a | 1243 | #ifndef HAVE_CYGWIN |
1244 | if (getuid() == 0 || geteuid() == 0) | |
f7342052 | 1245 | #endif /* HAVE_CYGWIN */ |
2731632a | 1246 | { |
1247 | ||
8bbfc882 | 1248 | #ifdef HAVE_SETPCRED |
166baacc | 1249 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1250 | fatal("Failed to set process credentials"); | |
8bbfc882 | 1251 | #endif /* HAVE_SETPCRED */ |
f7342052 | 1252 | #ifdef HAVE_LOGIN_CAP |
2d199535 | 1253 | # ifdef __bsdi__ |
8695f9f7 | 1254 | setpgid(0, 0); |
2d199535 | 1255 | # endif |
f4eaee12 | 1256 | # ifdef USE_PAM |
1257 | if (options.use_pam) { | |
1258 | do_pam_session(); | |
1259 | do_pam_setcred(0); | |
1260 | } | |
1261 | # endif /* USE_PAM */ | |
f7342052 | 1262 | if (setusercontext(lc, pw, pw->pw_uid, |
1263 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1264 | perror("unable to set user context"); | |
1265 | exit(1); | |
1266 | } | |
1267 | #else | |
1268 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1269 | /* Sets login uid for accounting */ | |
1270 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1271 | error("setluid: %s", strerror(errno)); | |
1272 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1273 | ||
1274 | if (setlogin(pw->pw_name) < 0) | |
1275 | error("setlogin failed: %s", strerror(errno)); | |
1276 | if (setgid(pw->pw_gid) < 0) { | |
1277 | perror("setgid"); | |
1278 | exit(1); | |
1279 | } | |
1280 | /* Initialize the group list. */ | |
1281 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1282 | perror("initgroups"); | |
1283 | exit(1); | |
1284 | } | |
1285 | endgrent(); | |
1286 | # ifdef USE_PAM | |
1287 | /* | |
aff51935 | 1288 | * PAM credentials may take the form of supplementary groups. |
f7342052 | 1289 | * These will have been wiped by the above initgroups() call. |
1290 | * Reestablish them here. | |
1291 | */ | |
49e82bb9 | 1292 | if (options.use_pam) { |
1293 | do_pam_session(); | |
7fceb20d | 1294 | do_pam_setcred(0); |
49e82bb9 | 1295 | } |
f7342052 | 1296 | # endif /* USE_PAM */ |
1297 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1298 | irix_setusercontext(pw); | |
1299 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
e2bc41f9 | 1300 | # ifdef _AIX |
0ba40daa | 1301 | aix_usrinfo(pw); |
e2bc41f9 | 1302 | # endif /* _AIX */ |
f7342052 | 1303 | /* Permanently switch to the desired uid. */ |
1304 | permanently_set_uid(pw); | |
1305 | #endif | |
1306 | } | |
2731632a | 1307 | |
1308 | #ifdef HAVE_CYGWIN | |
1309 | if (is_winnt) | |
1310 | #endif | |
f7342052 | 1311 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1312 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1313 | } | |
1314 | ||
37656beb | 1315 | static void |
1316 | do_pwchange(Session *s) | |
1317 | { | |
1318 | fprintf(stderr, "WARNING: Your password has expired.\n"); | |
1319 | if (s->ttyfd != -1) { | |
1320 | fprintf(stderr, | |
1321 | "You must change your password now and login again!\n"); | |
1322 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); | |
1323 | perror("passwd"); | |
1324 | } else { | |
1325 | fprintf(stderr, | |
1326 | "Password change required but no TTY available.\n"); | |
1327 | } | |
1328 | exit(1); | |
1329 | } | |
1330 | ||
51aeb639 | 1331 | static void |
1853d1ef | 1332 | launch_login(struct passwd *pw, const char *hostname) |
1333 | { | |
1334 | /* Launch login(1). */ | |
1335 | ||
85cc9118 | 1336 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1337 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1338 | (s->term ? s->term : "unknown"), |
1853d1ef | 1339 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1340 | #ifdef LOGIN_NO_ENDOPT |
1341 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1342 | #else | |
1853d1ef | 1343 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1344 | #endif |
1853d1ef | 1345 | |
1346 | /* Login couldn't be executed, die. */ | |
1347 | ||
1348 | perror("login"); | |
1349 | exit(1); | |
1350 | } | |
1351 | ||
37656beb | 1352 | static void |
1353 | child_close_fds(void) | |
1354 | { | |
1355 | int i; | |
1356 | ||
1357 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1358 | close(packet_get_connection_in()); | |
1359 | else { | |
1360 | close(packet_get_connection_in()); | |
1361 | close(packet_get_connection_out()); | |
1362 | } | |
1363 | /* | |
1364 | * Close all descriptors related to channels. They will still remain | |
1365 | * open in the parent. | |
1366 | */ | |
1367 | /* XXX better use close-on-exec? -markus */ | |
1368 | channel_close_all(); | |
1369 | ||
1370 | /* | |
1371 | * Close any extra file descriptors. Note that there may still be | |
1372 | * descriptors left by system functions. They will be closed later. | |
1373 | */ | |
1374 | endpwent(); | |
1375 | ||
1376 | /* | |
1377 | * Close any extra open file descriptors so that we don\'t have them | |
1378 | * hanging around in clients. Note that we want to do this after | |
1379 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1380 | * descriptors open. | |
1381 | */ | |
1382 | for (i = 3; i < 64; i++) | |
1383 | close(i); | |
1384 | } | |
1385 | ||
f7342052 | 1386 | /* |
1387 | * Performs common processing for the child, such as setting up the | |
1388 | * environment, closing extra file descriptors, setting the user and group | |
1389 | * ids, and executing the command or shell. | |
1390 | */ | |
1391 | void | |
1392 | do_child(Session *s, const char *command) | |
1393 | { | |
1394 | extern char **environ; | |
1395 | char **env; | |
1396 | char *argv[10]; | |
1397 | const char *shell, *shell0, *hostname = NULL; | |
1398 | struct passwd *pw = s->pw; | |
f7342052 | 1399 | |
1400 | /* remove hostkey from the child's memory */ | |
1401 | destroy_sensitive_data(); | |
1402 | ||
37656beb | 1403 | /* Force a password change */ |
1404 | if (s->authctxt->force_pwchange) { | |
1405 | do_setusercontext(pw); | |
1406 | child_close_fds(); | |
1407 | do_pwchange(s); | |
1408 | exit(1); | |
1409 | } | |
1410 | ||
f7342052 | 1411 | /* login(1) is only called if we execute the login shell */ |
1412 | if (options.use_login && command != NULL) | |
1413 | options.use_login = 0; | |
1414 | ||
ef51930f | 1415 | #ifdef _UNICOS |
1416 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1417 | #endif /* _UNICOS */ | |
1418 | ||
f7342052 | 1419 | /* |
1420 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1421 | * switch, so we let login(1) to this for us. | |
1422 | */ | |
1423 | if (!options.use_login) { | |
1424 | #ifdef HAVE_OSF_SIA | |
58d0df4e | 1425 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
f7342052 | 1426 | if (!check_quietlogin(s, command)) |
1427 | do_motd(); | |
1428 | #else /* HAVE_OSF_SIA */ | |
1429 | do_nologin(pw); | |
1430 | do_setusercontext(pw); | |
1431 | #endif /* HAVE_OSF_SIA */ | |
1432 | } | |
1433 | ||
1434 | /* | |
1435 | * Get the shell from the password data. An empty shell field is | |
1436 | * legal, and means /bin/sh. | |
1437 | */ | |
1438 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
32214c88 | 1439 | |
1440 | /* | |
1441 | * Make sure $SHELL points to the shell from the password file, | |
1442 | * even if shell is overridden from login.conf | |
1443 | */ | |
1444 | env = do_setup_env(s, shell); | |
1445 | ||
f7342052 | 1446 | #ifdef HAVE_LOGIN_CAP |
1447 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1448 | #endif | |
1449 | ||
2e73a022 | 1450 | /* we have to stash the hostname before we close our socket. */ |
1451 | if (options.use_login) | |
46e3af7f | 1452 | hostname = get_remote_name_or_ip(utmp_len, |
c5a7d788 | 1453 | options.use_dns); |
7368a6c8 | 1454 | /* |
1455 | * Close the connection descriptors; note that this is the child, and | |
1456 | * the server will still have the socket open, and it is important | |
1457 | * that we do not shutdown it. Note that the descriptors cannot be | |
1458 | * closed before building the environment, as we call | |
1459 | * get_remote_ipaddr there. | |
1460 | */ | |
37656beb | 1461 | child_close_fds(); |
7368a6c8 | 1462 | |
7368a6c8 | 1463 | /* |
2a8a6488 | 1464 | * Must take new environment into use so that .ssh/rc, |
1465 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1466 | */ |
1467 | environ = env; | |
1468 | ||
bcfcc5f9 | 1469 | #if defined(KRB5) && defined(USE_AFS) |
a1e30b47 | 1470 | /* |
1471 | * At this point, we check to see if AFS is active and if we have | |
1472 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1473 | * if we can (and need to) extend the ticket into an AFS token. If | |
1474 | * we don't do this, we run into potential problems if the user's | |
1475 | * home directory is in AFS and it's not world-readable. | |
1476 | */ | |
1477 | ||
1478 | if (options.kerberos_get_afs_token && k_hasafs() && | |
1479 | (s->authctxt->krb5_ctx != NULL)) { | |
1480 | char cell[64]; | |
1481 | ||
1482 | debug("Getting AFS token"); | |
1483 | ||
1484 | k_setpag(); | |
1485 | ||
1486 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1487 | krb5_afslog(s->authctxt->krb5_ctx, | |
1488 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1489 | ||
1490 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1491 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1492 | } | |
1493 | #endif | |
1494 | ||
dab89049 | 1495 | /* Change current directory to the user\'s home directory. */ |
1496 | if (chdir(pw->pw_dir) < 0) { | |
1497 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1498 | pw->pw_dir, strerror(errno)); | |
1499 | #ifdef HAVE_LOGIN_CAP | |
1500 | if (login_getcapbool(lc, "requirehome", 0)) | |
1501 | exit(1); | |
1502 | #endif | |
1503 | } | |
1504 | ||
f7342052 | 1505 | if (!options.use_login) |
1506 | do_rc_files(s, shell); | |
1d3c30db | 1507 | |
1508 | /* restore SIGPIPE for child */ | |
1509 | signal(SIGPIPE, SIG_DFL); | |
1510 | ||
f7342052 | 1511 | if (options.use_login) { |
1853d1ef | 1512 | launch_login(pw, hostname); |
1513 | /* NEVERREACHED */ | |
f7342052 | 1514 | } |
1515 | ||
1516 | /* Get the last component of the shell name. */ | |
1517 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1518 | shell0++; | |
1519 | else | |
1520 | shell0 = shell; | |
1521 | ||
7368a6c8 | 1522 | /* |
1523 | * If we have no command, execute the shell. In this case, the shell | |
1524 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1525 | * this is a login shell. | |
1526 | */ | |
1527 | if (!command) { | |
f7342052 | 1528 | char argv0[256]; |
7368a6c8 | 1529 | |
f7342052 | 1530 | /* Start the shell. Set initial character to '-'. */ |
1531 | argv0[0] = '-'; | |
7368a6c8 | 1532 | |
f7342052 | 1533 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1534 | >= sizeof(argv0) - 1) { | |
1535 | errno = EINVAL; | |
7368a6c8 | 1536 | perror(shell); |
1537 | exit(1); | |
f7342052 | 1538 | } |
7368a6c8 | 1539 | |
f7342052 | 1540 | /* Execute the shell. */ |
1541 | argv[0] = argv0; | |
1542 | argv[1] = NULL; | |
1543 | execve(shell, argv, env); | |
7368a6c8 | 1544 | |
f7342052 | 1545 | /* Executing the shell failed. */ |
1546 | perror(shell); | |
1547 | exit(1); | |
7368a6c8 | 1548 | } |
1549 | /* | |
1550 | * Execute the command using the user's shell. This uses the -c | |
1551 | * option to execute the command. | |
1552 | */ | |
f7342052 | 1553 | argv[0] = (char *) shell0; |
7368a6c8 | 1554 | argv[1] = "-c"; |
1555 | argv[2] = (char *) command; | |
1556 | argv[3] = NULL; | |
1557 | execve(shell, argv, env); | |
1558 | perror(shell); | |
1559 | exit(1); | |
1560 | } | |
1561 | ||
1562 | Session * | |
1563 | session_new(void) | |
1564 | { | |
1565 | int i; | |
1566 | static int did_init = 0; | |
1567 | if (!did_init) { | |
1568 | debug("session_new: init"); | |
184eed6a | 1569 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1570 | sessions[i].used = 0; |
7368a6c8 | 1571 | } |
1572 | did_init = 1; | |
1573 | } | |
184eed6a | 1574 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1575 | Session *s = &sessions[i]; |
1576 | if (! s->used) { | |
690d0d7f | 1577 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1578 | s->chanid = -1; |
1579 | s->ptyfd = -1; | |
1580 | s->ttyfd = -1; | |
7368a6c8 | 1581 | s->used = 1; |
86066315 | 1582 | s->self = i; |
02323c45 | 1583 | debug("session_new: session %d", i); |
7368a6c8 | 1584 | return s; |
1585 | } | |
1586 | } | |
1587 | return NULL; | |
1588 | } | |
1589 | ||
396c147e | 1590 | static void |
7368a6c8 | 1591 | session_dump(void) |
1592 | { | |
1593 | int i; | |
184eed6a | 1594 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1595 | Session *s = &sessions[i]; |
c457707e | 1596 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1597 | s->used, |
1598 | s->self, | |
1599 | s, | |
1600 | s->chanid, | |
c457707e | 1601 | (long)s->pid); |
7368a6c8 | 1602 | } |
1603 | } | |
1604 | ||
e78a59f5 | 1605 | int |
57156994 | 1606 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1607 | { |
1608 | Session *s = session_new(); | |
1609 | debug("session_open: channel %d", chanid); | |
1610 | if (s == NULL) { | |
1611 | error("no more sessions"); | |
1612 | return 0; | |
1613 | } | |
57156994 | 1614 | s->authctxt = authctxt; |
1615 | s->pw = authctxt->pw; | |
fdaef11e | 1616 | if (s->pw == NULL || !authctxt->valid) |
0725ea77 | 1617 | fatal("no user for session %d", s->self); |
0b242b12 | 1618 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1619 | s->chanid = chanid; | |
e78a59f5 | 1620 | return 1; |
1621 | } | |
1622 | ||
1853d1ef | 1623 | Session * |
1624 | session_by_tty(char *tty) | |
1625 | { | |
1626 | int i; | |
1627 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1628 | Session *s = &sessions[i]; | |
1629 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1630 | debug("session_by_tty: session %d tty %s", i, tty); | |
1631 | return s; | |
1632 | } | |
1633 | } | |
1634 | debug("session_by_tty: unknown tty %.100s", tty); | |
1635 | session_dump(); | |
1636 | return NULL; | |
1637 | } | |
1638 | ||
396c147e | 1639 | static Session * |
e78a59f5 | 1640 | session_by_channel(int id) |
1641 | { | |
1642 | int i; | |
184eed6a | 1643 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1644 | Session *s = &sessions[i]; |
1645 | if (s->used && s->chanid == id) { | |
1646 | debug("session_by_channel: session %d channel %d", i, id); | |
1647 | return s; | |
1648 | } | |
1649 | } | |
1650 | debug("session_by_channel: unknown channel %d", id); | |
1651 | session_dump(); | |
1652 | return NULL; | |
1653 | } | |
1654 | ||
396c147e | 1655 | static Session * |
e78a59f5 | 1656 | session_by_pid(pid_t pid) |
1657 | { | |
1658 | int i; | |
c457707e | 1659 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1660 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1661 | Session *s = &sessions[i]; |
1662 | if (s->used && s->pid == pid) | |
1663 | return s; | |
1664 | } | |
c457707e | 1665 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1666 | session_dump(); |
1667 | return NULL; | |
1668 | } | |
1669 | ||
396c147e | 1670 | static int |
e78a59f5 | 1671 | session_window_change_req(Session *s) |
1672 | { | |
1673 | s->col = packet_get_int(); | |
1674 | s->row = packet_get_int(); | |
1675 | s->xpixel = packet_get_int(); | |
1676 | s->ypixel = packet_get_int(); | |
95500969 | 1677 | packet_check_eom(); |
e78a59f5 | 1678 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1679 | return 1; | |
1680 | } | |
1681 | ||
396c147e | 1682 | static int |
e78a59f5 | 1683 | session_pty_req(Session *s) |
1684 | { | |
1e3b8b07 | 1685 | u_int len; |
30dcc918 | 1686 | int n_bytes; |
762715ce | 1687 | |
653d5f86 | 1688 | if (no_pty_flag) { |
1689 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1690 | return 0; |
653d5f86 | 1691 | } |
1692 | if (s->ttyfd != -1) { | |
1693 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1694 | return 0; |
653d5f86 | 1695 | } |
ffbf7323 | 1696 | /* Get the time and hostname when the user last logged in. */ |
1697 | if (options.print_lastlog) { | |
1698 | s->hostname[0] = '\0'; | |
1699 | s->last_login_time = get_last_login_time(s->pw->pw_uid, | |
1700 | s->pw->pw_name, s->hostname, sizeof(s->hostname)); | |
1701 | } | |
653d5f86 | 1702 | |
e78a59f5 | 1703 | s->term = packet_get_string(&len); |
653d5f86 | 1704 | |
1705 | if (compat20) { | |
1706 | s->col = packet_get_int(); | |
1707 | s->row = packet_get_int(); | |
1708 | } else { | |
1709 | s->row = packet_get_int(); | |
1710 | s->col = packet_get_int(); | |
1711 | } | |
e78a59f5 | 1712 | s->xpixel = packet_get_int(); |
1713 | s->ypixel = packet_get_int(); | |
1714 | ||
1715 | if (strcmp(s->term, "") == 0) { | |
1716 | xfree(s->term); | |
1717 | s->term = NULL; | |
1718 | } | |
653d5f86 | 1719 | |
e78a59f5 | 1720 | /* Allocate a pty and open it. */ |
653d5f86 | 1721 | debug("Allocating pty."); |
1853d1ef | 1722 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1723 | if (s->term) |
1724 | xfree(s->term); | |
e78a59f5 | 1725 | s->term = NULL; |
1726 | s->ptyfd = -1; | |
1727 | s->ttyfd = -1; | |
1728 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1729 | return 0; |
e78a59f5 | 1730 | } |
1731 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1732 | |
1733 | /* for SSH1 the tty modes length is not given */ | |
1734 | if (!compat20) | |
1735 | n_bytes = packet_remaining(); | |
1736 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1737 | ||
1853d1ef | 1738 | if (!use_privsep) |
1739 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1740 | |
1741 | /* Set window size from the packet. */ | |
e78a59f5 | 1742 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1743 | ||
95500969 | 1744 | packet_check_eom(); |
1d1ffb87 | 1745 | session_proctitle(s); |
e78a59f5 | 1746 | return 1; |
1747 | } | |
1748 | ||
396c147e | 1749 | static int |
0b242b12 | 1750 | session_subsystem_req(Session *s) |
1751 | { | |
01855277 | 1752 | struct stat st; |
1e3b8b07 | 1753 | u_int len; |
0b242b12 | 1754 | int success = 0; |
01855277 | 1755 | char *cmd, *subsys = packet_get_string(&len); |
38c295d6 | 1756 | int i; |
0b242b12 | 1757 | |
95500969 | 1758 | packet_check_eom(); |
bbe88b6d | 1759 | logit("subsystem request for %.100s", subsys); |
0b242b12 | 1760 | |
38c295d6 | 1761 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1762 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
1763 | cmd = options.subsystem_command[i]; | |
1764 | if (stat(cmd, &st) < 0) { | |
1765 | error("subsystem: cannot stat %s: %s", cmd, | |
1766 | strerror(errno)); | |
1767 | break; | |
1768 | } | |
1769 | debug("subsystem: exec() %s", cmd); | |
e5d7a405 | 1770 | s->is_subsystem = 1; |
01855277 | 1771 | do_exec(s, cmd); |
38c295d6 | 1772 | success = 1; |
24932ee9 | 1773 | break; |
38c295d6 | 1774 | } |
1775 | } | |
1776 | ||
1777 | if (!success) | |
bbe88b6d | 1778 | logit("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1779 | subsys); |
38c295d6 | 1780 | |
0b242b12 | 1781 | xfree(subsys); |
1782 | return success; | |
1783 | } | |
1784 | ||
396c147e | 1785 | static int |
0b242b12 | 1786 | session_x11_req(Session *s) |
1787 | { | |
8dcd9d5c | 1788 | int success; |
0b242b12 | 1789 | |
1790 | s->single_connection = packet_get_char(); | |
1791 | s->auth_proto = packet_get_string(NULL); | |
1792 | s->auth_data = packet_get_string(NULL); | |
1793 | s->screen = packet_get_int(); | |
95500969 | 1794 | packet_check_eom(); |
0b242b12 | 1795 | |
8dcd9d5c | 1796 | success = session_setup_x11fwd(s); |
1797 | if (!success) { | |
0b242b12 | 1798 | xfree(s->auth_proto); |
1799 | xfree(s->auth_data); | |
1500bcdd | 1800 | s->auth_proto = NULL; |
1801 | s->auth_data = NULL; | |
0b242b12 | 1802 | } |
8dcd9d5c | 1803 | return success; |
0b242b12 | 1804 | } |
1805 | ||
396c147e | 1806 | static int |
38c295d6 | 1807 | session_shell_req(Session *s) |
1808 | { | |
95500969 | 1809 | packet_check_eom(); |
dac6753b | 1810 | do_exec(s, NULL); |
38c295d6 | 1811 | return 1; |
1812 | } | |
1813 | ||
396c147e | 1814 | static int |
38c295d6 | 1815 | session_exec_req(Session *s) |
1816 | { | |
1e3b8b07 | 1817 | u_int len; |
38c295d6 | 1818 | char *command = packet_get_string(&len); |
95500969 | 1819 | packet_check_eom(); |
dac6753b | 1820 | do_exec(s, command); |
c95add71 | 1821 | xfree(command); |
38c295d6 | 1822 | return 1; |
1823 | } | |
1824 | ||
16a79097 | 1825 | static int |
1826 | session_break_req(Session *s) | |
1827 | { | |
1828 | u_int break_length; | |
1829 | ||
8168a86a | 1830 | break_length = packet_get_int(); /* ignored */ |
16a79097 | 1831 | packet_check_eom(); |
1832 | ||
8168a86a | 1833 | if (s->ttyfd == -1 || |
1834 | tcsendbreak(s->ttyfd, 0) < 0) | |
16a79097 | 1835 | return 0; |
16a79097 | 1836 | return 1; |
1837 | } | |
1838 | ||
61a2c1da | 1839 | static int |
1840 | session_env_req(Session *s) | |
1841 | { | |
1842 | char *name, *val; | |
1843 | u_int name_len, val_len, i; | |
1844 | ||
1845 | name = packet_get_string(&name_len); | |
1846 | val = packet_get_string(&val_len); | |
1847 | packet_check_eom(); | |
1848 | ||
1849 | /* Don't set too many environment variables */ | |
1850 | if (s->num_env > 128) { | |
1851 | debug2("Ignoring env request %s: too many env vars", name); | |
1852 | goto fail; | |
1853 | } | |
1854 | ||
1855 | for (i = 0; i < options.num_accept_env; i++) { | |
1856 | if (match_pattern(name, options.accept_env[i])) { | |
1857 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
1858 | s->env = xrealloc(s->env, sizeof(*s->env) * | |
1859 | (s->num_env + 1)); | |
1860 | s->env[s->num_env].name = name; | |
1861 | s->env[s->num_env].val = val; | |
1862 | s->num_env++; | |
1863 | return (1); | |
1864 | } | |
1865 | } | |
1866 | debug2("Ignoring env request %s: disallowed name", name); | |
1867 | ||
1868 | fail: | |
1869 | xfree(name); | |
1870 | xfree(val); | |
1871 | return (0); | |
1872 | } | |
1873 | ||
396c147e | 1874 | static int |
fa08c86b | 1875 | session_auth_agent_req(Session *s) |
1876 | { | |
1877 | static int called = 0; | |
95500969 | 1878 | packet_check_eom(); |
d343d900 | 1879 | if (no_agent_forwarding_flag) { |
1880 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1881 | return 0; | |
1882 | } | |
fa08c86b | 1883 | if (called) { |
1884 | return 0; | |
1885 | } else { | |
1886 | called = 1; | |
1887 | return auth_input_request_forwarding(s->pw); | |
1888 | } | |
1889 | } | |
1890 | ||
7899c98f | 1891 | int |
1892 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 1893 | { |
e78a59f5 | 1894 | int success = 0; |
e78a59f5 | 1895 | Session *s; |
e78a59f5 | 1896 | |
7899c98f | 1897 | if ((s = session_by_channel(c->self)) == NULL) { |
bbe88b6d | 1898 | logit("session_input_channel_req: no session %d req %.100s", |
7899c98f | 1899 | c->self, rtype); |
1900 | return 0; | |
1901 | } | |
1902 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 1903 | |
1904 | /* | |
e5d7a405 | 1905 | * a session is in LARVAL state until a shell, a command |
1906 | * or a subsystem is executed | |
e78a59f5 | 1907 | */ |
1908 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1909 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1910 | success = session_shell_req(s); |
e78a59f5 | 1911 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1912 | success = session_exec_req(s); |
e78a59f5 | 1913 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1914 | success = session_pty_req(s); |
0b242b12 | 1915 | } else if (strcmp(rtype, "x11-req") == 0) { |
1916 | success = session_x11_req(s); | |
fa08c86b | 1917 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1918 | success = session_auth_agent_req(s); | |
0b242b12 | 1919 | } else if (strcmp(rtype, "subsystem") == 0) { |
1920 | success = session_subsystem_req(s); | |
16a79097 | 1921 | } else if (strcmp(rtype, "break") == 0) { |
1922 | success = session_break_req(s); | |
61a2c1da | 1923 | } else if (strcmp(rtype, "env") == 0) { |
1924 | success = session_env_req(s); | |
e78a59f5 | 1925 | } |
1926 | } | |
1927 | if (strcmp(rtype, "window-change") == 0) { | |
1928 | success = session_window_change_req(s); | |
1929 | } | |
7899c98f | 1930 | return success; |
e78a59f5 | 1931 | } |
1932 | ||
1933 | void | |
1934 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1935 | { | |
1936 | if (!compat20) | |
1937 | fatal("session_set_fds: called for proto != 2.0"); | |
1938 | /* | |
1939 | * now that have a child and a pipe to the child, | |
1940 | * we can activate our channel and register the fd's | |
1941 | */ | |
1942 | if (s->chanid == -1) | |
1943 | fatal("no channel for session %d", s->self); | |
1944 | channel_set_fds(s->chanid, | |
1945 | fdout, fdin, fderr, | |
a22aff1f | 1946 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 1947 | 1, |
1948 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 1949 | } |
1950 | ||
86066315 | 1951 | /* |
1952 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
1953 | * (e.g., due to a dropped connection). | |
1954 | */ | |
1853d1ef | 1955 | void |
2362db19 | 1956 | session_pty_cleanup2(Session *s) |
7368a6c8 | 1957 | { |
86066315 | 1958 | if (s == NULL) { |
1959 | error("session_pty_cleanup: no session"); | |
1960 | return; | |
1961 | } | |
1962 | if (s->ttyfd == -1) | |
7368a6c8 | 1963 | return; |
1964 | ||
0725ea77 | 1965 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 1966 | |
7368a6c8 | 1967 | /* Record that the user has logged out. */ |
86066315 | 1968 | if (s->pid != 0) |
f3837bc6 | 1969 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 1970 | |
1971 | /* Release the pseudo-tty. */ | |
1853d1ef | 1972 | if (getuid() == 0) |
1973 | pty_release(s->tty); | |
7368a6c8 | 1974 | |
1975 | /* | |
1976 | * Close the server side of the socket pairs. We must do this after | |
1977 | * the pty cleanup, so that another process doesn't get this pty | |
1978 | * while we're still cleaning up. | |
1979 | */ | |
1980 | if (close(s->ptymaster) < 0) | |
1853d1ef | 1981 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 1982 | |
1983 | /* unlink pty from session */ | |
1984 | s->ttyfd = -1; | |
7368a6c8 | 1985 | } |
e78a59f5 | 1986 | |
1853d1ef | 1987 | void |
2362db19 | 1988 | session_pty_cleanup(Session *s) |
1853d1ef | 1989 | { |
2362db19 | 1990 | PRIVSEP(session_pty_cleanup2(s)); |
1853d1ef | 1991 | } |
1992 | ||
6c723e7c | 1993 | static char * |
1994 | sig2name(int sig) | |
1995 | { | |
1996 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
1997 | SSH_SIG(ABRT); | |
1998 | SSH_SIG(ALRM); | |
1999 | SSH_SIG(FPE); | |
2000 | SSH_SIG(HUP); | |
2001 | SSH_SIG(ILL); | |
2002 | SSH_SIG(INT); | |
2003 | SSH_SIG(KILL); | |
2004 | SSH_SIG(PIPE); | |
2005 | SSH_SIG(QUIT); | |
2006 | SSH_SIG(SEGV); | |
2007 | SSH_SIG(TERM); | |
2008 | SSH_SIG(USR1); | |
2009 | SSH_SIG(USR2); | |
2010 | #undef SSH_SIG | |
2011 | return "SIG@openssh.com"; | |
2012 | } | |
2013 | ||
396c147e | 2014 | static void |
e78a59f5 | 2015 | session_exit_message(Session *s, int status) |
2016 | { | |
2017 | Channel *c; | |
5a4ae906 | 2018 | |
2019 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 2020 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 2021 | s->self, s->chanid); |
c457707e | 2022 | debug("session_exit_message: session %d channel %d pid %ld", |
2023 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 2024 | |
2025 | if (WIFEXITED(status)) { | |
5a4ae906 | 2026 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 2027 | packet_put_int(WEXITSTATUS(status)); |
2028 | packet_send(); | |
2029 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 2030 | channel_request_start(s->chanid, "exit-signal", 0); |
6c723e7c | 2031 | packet_put_cstring(sig2name(WTERMSIG(status))); |
a64009ad | 2032 | #ifdef WCOREDUMP |
e78a59f5 | 2033 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 2034 | #else /* WCOREDUMP */ |
2035 | packet_put_char(0); | |
2036 | #endif /* WCOREDUMP */ | |
e78a59f5 | 2037 | packet_put_cstring(""); |
2038 | packet_put_cstring(""); | |
2039 | packet_send(); | |
2040 | } else { | |
2041 | /* Some weird exit cause. Just exit. */ | |
2042 | packet_disconnect("wait returned status %04x.", status); | |
2043 | } | |
2044 | ||
2045 | /* disconnect channel */ | |
2046 | debug("session_exit_message: release channel %d", s->chanid); | |
2047 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 2048 | /* |
2049 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2050 | * interested in data we write. | |
2051 | * Note that we must not call 'chan_read_failed', since there could | |
2052 | * be some more data waiting in the pipe. | |
2053 | */ | |
0b242b12 | 2054 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
2055 | chan_write_failed(c); | |
e78a59f5 | 2056 | s->chanid = -1; |
2057 | } | |
2058 | ||
1853d1ef | 2059 | void |
86066315 | 2060 | session_close(Session *s) |
e78a59f5 | 2061 | { |
61a2c1da | 2062 | int i; |
2063 | ||
c457707e | 2064 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
2362db19 | 2065 | if (s->ttyfd != -1) |
86066315 | 2066 | session_pty_cleanup(s); |
e78a59f5 | 2067 | if (s->term) |
2068 | xfree(s->term); | |
2069 | if (s->display) | |
2070 | xfree(s->display); | |
f9314d9a | 2071 | if (s->auth_display) |
2072 | xfree(s->auth_display); | |
e78a59f5 | 2073 | if (s->auth_data) |
2074 | xfree(s->auth_data); | |
2075 | if (s->auth_proto) | |
2076 | xfree(s->auth_proto); | |
2077 | s->used = 0; | |
61a2c1da | 2078 | for (i = 0; i < s->num_env; i++) { |
2079 | xfree(s->env[i].name); | |
2080 | xfree(s->env[i].val); | |
2081 | } | |
2082 | if (s->env != NULL) | |
2083 | xfree(s->env); | |
1d1ffb87 | 2084 | session_proctitle(s); |
e78a59f5 | 2085 | } |
2086 | ||
2087 | void | |
2088 | session_close_by_pid(pid_t pid, int status) | |
2089 | { | |
2090 | Session *s = session_by_pid(pid); | |
2091 | if (s == NULL) { | |
c457707e | 2092 | debug("session_close_by_pid: no session for pid %ld", |
2093 | (long)pid); | |
e78a59f5 | 2094 | return; |
2095 | } | |
2096 | if (s->chanid != -1) | |
2097 | session_exit_message(s, status); | |
2098 | session_close(s); | |
2099 | } | |
2100 | ||
2101 | /* | |
2102 | * this is called when a channel dies before | |
2103 | * the session 'child' itself dies | |
2104 | */ | |
2105 | void | |
2106 | session_close_by_channel(int id, void *arg) | |
2107 | { | |
2108 | Session *s = session_by_channel(id); | |
2109 | if (s == NULL) { | |
418e724c | 2110 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 2111 | return; |
2112 | } | |
c457707e | 2113 | debug("session_close_by_channel: channel %d child %ld", |
2114 | id, (long)s->pid); | |
d5f24f94 | 2115 | if (s->pid != 0) { |
418e724c | 2116 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 2117 | /* |
2118 | * delay detach of session, but release pty, since | |
2119 | * the fd's to the child are already closed | |
2120 | */ | |
2362db19 | 2121 | if (s->ttyfd != -1) |
efcc9957 | 2122 | session_pty_cleanup(s); |
418e724c | 2123 | return; |
e78a59f5 | 2124 | } |
418e724c | 2125 | /* detach by removing callback */ |
2126 | channel_cancel_cleanup(s->chanid); | |
2127 | s->chanid = -1; | |
d5f24f94 | 2128 | session_close(s); |
2129 | } | |
2130 | ||
2131 | void | |
1853d1ef | 2132 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 2133 | { |
2134 | int i; | |
184eed6a | 2135 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 2136 | Session *s = &sessions[i]; |
1853d1ef | 2137 | if (s->used) { |
2138 | if (closefunc != NULL) | |
2139 | closefunc(s); | |
2140 | else | |
2141 | session_close(s); | |
2142 | } | |
d5f24f94 | 2143 | } |
e78a59f5 | 2144 | } |
2145 | ||
396c147e | 2146 | static char * |
1d1ffb87 | 2147 | session_tty_list(void) |
2148 | { | |
2149 | static char buf[1024]; | |
2150 | int i; | |
d0104542 | 2151 | char *cp; |
2152 | ||
1d1ffb87 | 2153 | buf[0] = '\0'; |
184eed6a | 2154 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 2155 | Session *s = &sessions[i]; |
2156 | if (s->used && s->ttyfd != -1) { | |
b6453d99 | 2157 | |
d0104542 | 2158 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2159 | cp = strrchr(s->tty, '/'); | |
2160 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2161 | } else | |
2162 | cp = s->tty + 5; | |
b6453d99 | 2163 | |
1d1ffb87 | 2164 | if (buf[0] != '\0') |
2165 | strlcat(buf, ",", sizeof buf); | |
d0104542 | 2166 | strlcat(buf, cp, sizeof buf); |
1d1ffb87 | 2167 | } |
2168 | } | |
2169 | if (buf[0] == '\0') | |
2170 | strlcpy(buf, "notty", sizeof buf); | |
2171 | return buf; | |
2172 | } | |
2173 | ||
2174 | void | |
2175 | session_proctitle(Session *s) | |
2176 | { | |
2177 | if (s->pw == NULL) | |
2178 | error("no user for session %d", s->self); | |
2179 | else | |
2180 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2181 | } | |
2182 | ||
8dcd9d5c | 2183 | int |
2184 | session_setup_x11fwd(Session *s) | |
2185 | { | |
8dcd9d5c | 2186 | struct stat st; |
c9d0ad9b | 2187 | char display[512], auth_display[512]; |
2188 | char hostname[MAXHOSTNAMELEN]; | |
8dcd9d5c | 2189 | |
2190 | if (no_x11_forwarding_flag) { | |
2191 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2192 | return 0; | |
2193 | } | |
2194 | if (!options.x11_forwarding) { | |
2195 | debug("X11 forwarding disabled in server configuration file."); | |
2196 | return 0; | |
2197 | } | |
2198 | if (!options.xauth_location || | |
2199 | (stat(options.xauth_location, &st) == -1)) { | |
2200 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2201 | return 0; | |
2202 | } | |
ff027d84 | 2203 | if (options.use_login) { |
2204 | packet_send_debug("X11 forwarding disabled; " | |
2205 | "not compatible with UseLogin=yes."); | |
2206 | return 0; | |
2207 | } | |
b44de2b1 | 2208 | if (s->display != NULL) { |
8dcd9d5c | 2209 | debug("X11 display already set."); |
2210 | return 0; | |
2211 | } | |
57f228e8 | 2212 | if (x11_create_display_inet(options.x11_display_offset, |
2213 | options.x11_use_localhost, s->single_connection, | |
2214 | &s->display_number) == -1) { | |
b44de2b1 | 2215 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 2216 | return 0; |
2217 | } | |
c9d0ad9b | 2218 | |
2219 | /* Set up a suitable value for the DISPLAY variable. */ | |
2220 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2221 | fatal("gethostname: %.100s", strerror(errno)); | |
2222 | /* | |
2223 | * auth_display must be used as the displayname when the | |
2224 | * authorization entry is added with xauth(1). This will be | |
2225 | * different than the DISPLAY string for localhost displays. | |
2226 | */ | |
e6e573bd | 2227 | if (options.x11_use_localhost) { |
57f228e8 | 2228 | snprintf(display, sizeof display, "localhost:%u.%u", |
c9d0ad9b | 2229 | s->display_number, s->screen); |
57f228e8 | 2230 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
f9314d9a | 2231 | s->display_number, s->screen); |
c9d0ad9b | 2232 | s->display = xstrdup(display); |
f9314d9a | 2233 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 2234 | } else { |
2235 | #ifdef IPADDR_IN_DISPLAY | |
2236 | struct hostent *he; | |
2237 | struct in_addr my_addr; | |
2238 | ||
2239 | he = gethostbyname(hostname); | |
2240 | if (he == NULL) { | |
2241 | error("Can't get IP address for X11 DISPLAY."); | |
2242 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2243 | return 0; | |
2244 | } | |
2245 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
57f228e8 | 2246 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
c9d0ad9b | 2247 | s->display_number, s->screen); |
2248 | #else | |
57f228e8 | 2249 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
c9d0ad9b | 2250 | s->display_number, s->screen); |
2251 | #endif | |
2252 | s->display = xstrdup(display); | |
f9314d9a | 2253 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2254 | } |
2255 | ||
8dcd9d5c | 2256 | return 1; |
2257 | } | |
2258 | ||
396c147e | 2259 | static void |
59c97189 | 2260 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2261 | { |
57156994 | 2262 | server_loop2(authctxt); |
2362db19 | 2263 | } |
2264 | ||
2265 | void | |
2266 | do_cleanup(Authctxt *authctxt) | |
2267 | { | |
2268 | static int called = 0; | |
2269 | ||
2270 | debug("do_cleanup"); | |
2271 | ||
2272 | /* no cleanup if we're in the child for login shell */ | |
2273 | if (is_child) | |
2274 | return; | |
2275 | ||
2276 | /* avoid double cleanup */ | |
2277 | if (called) | |
2278 | return; | |
2279 | called = 1; | |
2280 | ||
2281 | if (authctxt == NULL) | |
2282 | return; | |
2283 | #ifdef KRB5 | |
2284 | if (options.kerberos_ticket_cleanup && | |
2285 | authctxt->krb5_ctx) | |
2286 | krb5_cleanup_proc(authctxt); | |
7364bd04 | 2287 | #endif |
2362db19 | 2288 | |
2289 | #ifdef GSSAPI | |
2290 | if (compat20 && options.gss_cleanup_creds) | |
2291 | ssh_gssapi_cleanup_creds(); | |
2292 | #endif | |
2293 | ||
c6630044 | 2294 | #ifdef USE_PAM |
2295 | if (options.use_pam) { | |
2296 | sshpam_cleanup(); | |
2297 | sshpam_thread_cleanup(); | |
2298 | } | |
2299 | #endif | |
2300 | ||
2362db19 | 2301 | /* remove agent socket */ |
2302 | auth_sock_cleanup_proc(authctxt->pw); | |
2303 | ||
2304 | /* | |
2305 | * Cleanup ptys/utmp only if privsep is disabled, | |
2306 | * or if running in monitor. | |
2307 | */ | |
2308 | if (!use_privsep || mm_is_monitor()) | |
2309 | session_destroy_all(session_pty_cleanup2); | |
e78a59f5 | 2310 | } |