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3c0ef626 | 1 | /* |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
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 | * | |
11 | * SSH2 support by Markus Friedl. | |
12 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. | |
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. | |
33 | */ | |
34 | ||
35 | #include "includes.h" | |
540d72c3 | 36 | RCSID("$OpenBSD: session.c,v 1.172 2004/01/30 09:48:57 markus Exp $"); |
3c0ef626 | 37 | |
38 | #include "ssh.h" | |
39 | #include "ssh1.h" | |
40 | #include "ssh2.h" | |
41 | #include "xmalloc.h" | |
42 | #include "sshpty.h" | |
43 | #include "packet.h" | |
44 | #include "buffer.h" | |
45 | #include "mpaux.h" | |
46 | #include "uidswap.h" | |
47 | #include "compat.h" | |
48 | #include "channels.h" | |
49 | #include "bufaux.h" | |
50 | #include "auth.h" | |
51 | #include "auth-options.h" | |
52 | #include "pathnames.h" | |
53 | #include "log.h" | |
54 | #include "servconf.h" | |
55 | #include "sshlogin.h" | |
56 | #include "serverloop.h" | |
57 | #include "canohost.h" | |
58 | #include "session.h" | |
350391c5 | 59 | #include "monitor_wrap.h" |
3c0ef626 | 60 | |
540d72c3 | 61 | #if defined(KRB5) && defined(USE_AFS) |
62 | #include <kafs.h> | |
63 | #endif | |
64 | ||
5598e598 | 65 | #ifdef GSSAPI |
66 | #include "ssh-gss.h" | |
67 | #endif | |
68 | ||
3c0ef626 | 69 | /* func */ |
70 | ||
71 | Session *session_new(void); | |
72 | void session_set_fds(Session *, int, int, int); | |
540d72c3 | 73 | void session_pty_cleanup(Session *); |
3c0ef626 | 74 | void session_proctitle(Session *); |
75 | int session_setup_x11fwd(Session *); | |
76 | void do_exec_pty(Session *, const char *); | |
77 | void do_exec_no_pty(Session *, const char *); | |
78 | void do_exec(Session *, const char *); | |
79 | void do_login(Session *, const char *); | |
80 | #ifdef LOGIN_NEEDS_UTMPX | |
81 | static void do_pre_login(Session *s); | |
82 | #endif | |
83 | void do_child(Session *, const char *); | |
84 | void do_motd(void); | |
85 | int check_quietlogin(Session *, const char *); | |
86 | ||
87 | static void do_authenticated1(Authctxt *); | |
88 | static void do_authenticated2(Authctxt *); | |
89 | ||
3c0ef626 | 90 | static int session_pty_req(Session *); |
91 | ||
75be3237 | 92 | #ifdef SESSION_HOOKS |
93 | static void execute_session_hook(char* prog, Authctxt *authctxt, | |
94 | int startup, int save); | |
95 | #endif | |
96 | ||
3c0ef626 | 97 | /* import */ |
98 | extern ServerOptions options; | |
99 | extern char *__progname; | |
100 | extern int log_stderr; | |
101 | extern int debug_flag; | |
102 | extern u_int utmp_len; | |
103 | extern int startup_pipe; | |
104 | extern void destroy_sensitive_data(void); | |
7cac2b65 | 105 | extern Buffer loginmsg; |
3c0ef626 | 106 | |
107 | /* original command from peer. */ | |
108 | const char *original_command = NULL; | |
109 | ||
110 | /* data */ | |
111 | #define MAX_SESSIONS 10 | |
112 | Session sessions[MAX_SESSIONS]; | |
113 | ||
3c0ef626 | 114 | #ifdef HAVE_LOGIN_CAP |
350391c5 | 115 | login_cap_t *lc; |
3c0ef626 | 116 | #endif |
117 | ||
540d72c3 | 118 | static int is_child = 0; |
119 | ||
44a053a3 | 120 | /* Name and directory of socket for authentication agent forwarding. */ |
121 | static char *auth_sock_name = NULL; | |
122 | static char *auth_sock_dir = NULL; | |
123 | ||
124 | /* removes the agent forwarding socket */ | |
125 | ||
126 | static void | |
540d72c3 | 127 | auth_sock_cleanup_proc(struct passwd *pw) |
44a053a3 | 128 | { |
44a053a3 | 129 | if (auth_sock_name != NULL) { |
130 | temporarily_use_uid(pw); | |
131 | unlink(auth_sock_name); | |
132 | rmdir(auth_sock_dir); | |
133 | auth_sock_name = NULL; | |
134 | restore_uid(); | |
135 | } | |
136 | } | |
137 | ||
138 | static int | |
139 | auth_input_request_forwarding(struct passwd * pw) | |
140 | { | |
141 | Channel *nc; | |
142 | int sock; | |
143 | struct sockaddr_un sunaddr; | |
144 | ||
145 | if (auth_sock_name != NULL) { | |
146 | error("authentication forwarding requested twice."); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
151 | temporarily_use_uid(pw); | |
152 | ||
153 | /* Allocate a buffer for the socket name, and format the name. */ | |
154 | auth_sock_name = xmalloc(MAXPATHLEN); | |
155 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
540d72c3 | 156 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
44a053a3 | 157 | |
158 | /* Create private directory for socket */ | |
159 | if (mkdtemp(auth_sock_dir) == NULL) { | |
160 | packet_send_debug("Agent forwarding disabled: " | |
161 | "mkdtemp() failed: %.100s", strerror(errno)); | |
162 | restore_uid(); | |
163 | xfree(auth_sock_name); | |
164 | xfree(auth_sock_dir); | |
165 | auth_sock_name = NULL; | |
166 | auth_sock_dir = NULL; | |
167 | return 0; | |
168 | } | |
169 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", | |
170 | auth_sock_dir, (long) getpid()); | |
171 | ||
44a053a3 | 172 | /* Create the socket. */ |
173 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
174 | if (sock < 0) | |
175 | packet_disconnect("socket: %.100s", strerror(errno)); | |
176 | ||
177 | /* Bind it to the name. */ | |
178 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
179 | sunaddr.sun_family = AF_UNIX; | |
180 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
181 | ||
182 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
183 | packet_disconnect("bind: %.100s", strerror(errno)); | |
184 | ||
185 | /* Restore the privileged uid. */ | |
186 | restore_uid(); | |
187 | ||
188 | /* Start listening on the socket. */ | |
540d72c3 | 189 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
44a053a3 | 190 | packet_disconnect("listen: %.100s", strerror(errno)); |
191 | ||
192 | /* Allocate a channel for the authentication agent socket. */ | |
193 | nc = channel_new("auth socket", | |
194 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
195 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
7cac2b65 | 196 | 0, "auth socket", 1); |
44a053a3 | 197 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
198 | return 1; | |
199 | } | |
200 | ||
540d72c3 | 201 | static void |
202 | display_loginmsg(void) | |
203 | { | |
204 | if (buffer_len(&loginmsg) > 0) { | |
205 | buffer_append(&loginmsg, "\0", 1); | |
206 | printf("%s\n", (char *)buffer_ptr(&loginmsg)); | |
207 | buffer_clear(&loginmsg); | |
208 | } | |
209 | } | |
44a053a3 | 210 | |
3c0ef626 | 211 | void |
212 | do_authenticated(Authctxt *authctxt) | |
213 | { | |
bfe49944 | 214 | setproctitle("%s", authctxt->pw->pw_name); |
215 | ||
3c0ef626 | 216 | /* |
217 | * Cancel the alarm we set to limit the time taken for | |
218 | * authentication. | |
219 | */ | |
220 | alarm(0); | |
221 | if (startup_pipe != -1) { | |
222 | close(startup_pipe); | |
223 | startup_pipe = -1; | |
224 | } | |
3c0ef626 | 225 | /* setup the channel layer */ |
226 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
227 | channel_permit_all_opens(); | |
228 | ||
229 | if (compat20) | |
230 | do_authenticated2(authctxt); | |
231 | else | |
232 | do_authenticated1(authctxt); | |
233 | ||
75be3237 | 234 | #ifdef SESSION_HOOKS |
235 | if (options.session_hooks_allow && | |
236 | options.session_hooks_shutdown_cmd) | |
237 | { | |
238 | execute_session_hook(options.session_hooks_shutdown_cmd, | |
239 | authctxt, | |
240 | /* startup = */ 0, /* save = */ 0); | |
241 | ||
242 | if (authctxt->session_env_file) | |
243 | { | |
244 | free(authctxt->session_env_file); | |
245 | } | |
246 | } | |
247 | #endif | |
540d72c3 | 248 | |
249 | do_cleanup(authctxt); | |
3c0ef626 | 250 | } |
251 | ||
252 | /* | |
253 | * Prepares for an interactive session. This is called after the user has | |
254 | * been successfully authenticated. During this message exchange, pseudo | |
255 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
256 | * are requested, etc. | |
257 | */ | |
258 | static void | |
259 | do_authenticated1(Authctxt *authctxt) | |
260 | { | |
261 | Session *s; | |
262 | char *command; | |
e9702f7d | 263 | int success, type, screen_flag; |
276b07a3 | 264 | int enable_compression_after_reply = 0; |
265 | u_int proto_len, data_len, dlen, compression_level = 0; | |
3c0ef626 | 266 | |
267 | s = session_new(); | |
268 | s->authctxt = authctxt; | |
269 | s->pw = authctxt->pw; | |
270 | ||
271 | /* | |
272 | * We stay in this loop until the client requests to execute a shell | |
273 | * or a command. | |
274 | */ | |
275 | for (;;) { | |
276 | success = 0; | |
277 | ||
278 | /* Get a packet from the client. */ | |
e9702f7d | 279 | type = packet_read(); |
3c0ef626 | 280 | |
281 | /* Process the packet. */ | |
282 | switch (type) { | |
283 | case SSH_CMSG_REQUEST_COMPRESSION: | |
3c0ef626 | 284 | compression_level = packet_get_int(); |
e9702f7d | 285 | packet_check_eom(); |
3c0ef626 | 286 | if (compression_level < 1 || compression_level > 9) { |
287 | packet_send_debug("Received illegal compression level %d.", | |
e9702f7d | 288 | compression_level); |
3c0ef626 | 289 | break; |
290 | } | |
44a053a3 | 291 | if (!options.compression) { |
292 | debug2("compression disabled"); | |
293 | break; | |
294 | } | |
3c0ef626 | 295 | /* Enable compression after we have responded with SUCCESS. */ |
296 | enable_compression_after_reply = 1; | |
297 | success = 1; | |
298 | break; | |
299 | ||
300 | case SSH_CMSG_REQUEST_PTY: | |
301 | success = session_pty_req(s); | |
302 | break; | |
303 | ||
304 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
305 | s->auth_proto = packet_get_string(&proto_len); | |
306 | s->auth_data = packet_get_string(&data_len); | |
307 | ||
308 | screen_flag = packet_get_protocol_flags() & | |
309 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
310 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
311 | ||
312 | if (packet_remaining() == 4) { | |
313 | if (!screen_flag) | |
314 | debug2("Buggy client: " | |
315 | "X11 screen flag missing"); | |
316 | s->screen = packet_get_int(); | |
317 | } else { | |
318 | s->screen = 0; | |
319 | } | |
e9702f7d | 320 | packet_check_eom(); |
3c0ef626 | 321 | success = session_setup_x11fwd(s); |
322 | if (!success) { | |
323 | xfree(s->auth_proto); | |
324 | xfree(s->auth_data); | |
325 | s->auth_proto = NULL; | |
326 | s->auth_data = NULL; | |
327 | } | |
328 | break; | |
329 | ||
330 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
331 | if (no_agent_forwarding_flag || compat13) { | |
332 | debug("Authentication agent forwarding not permitted for this authentication."); | |
333 | break; | |
334 | } | |
335 | debug("Received authentication agent forwarding request."); | |
336 | success = auth_input_request_forwarding(s->pw); | |
337 | break; | |
338 | ||
339 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
340 | if (no_port_forwarding_flag) { | |
341 | debug("Port forwarding not permitted for this authentication."); | |
342 | break; | |
343 | } | |
344 | if (!options.allow_tcp_forwarding) { | |
345 | debug("Port forwarding not permitted."); | |
346 | break; | |
347 | } | |
348 | debug("Received TCP/IP port forwarding request."); | |
349 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); | |
350 | success = 1; | |
351 | break; | |
352 | ||
353 | case SSH_CMSG_MAX_PACKET_SIZE: | |
354 | if (packet_set_maxsize(packet_get_int()) > 0) | |
355 | success = 1; | |
356 | break; | |
e9702f7d | 357 | |
3c0ef626 | 358 | case SSH_CMSG_EXEC_SHELL: |
359 | case SSH_CMSG_EXEC_CMD: | |
360 | if (type == SSH_CMSG_EXEC_CMD) { | |
361 | command = packet_get_string(&dlen); | |
362 | debug("Exec command '%.500s'", command); | |
363 | do_exec(s, command); | |
364 | xfree(command); | |
365 | } else { | |
366 | do_exec(s, NULL); | |
367 | } | |
e9702f7d | 368 | packet_check_eom(); |
3c0ef626 | 369 | session_close(s); |
370 | return; | |
371 | ||
372 | default: | |
373 | /* | |
374 | * Any unknown messages in this phase are ignored, | |
375 | * and a failure message is returned. | |
376 | */ | |
7cac2b65 | 377 | logit("Unknown packet type received after authentication: %d", type); |
3c0ef626 | 378 | } |
379 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
380 | packet_send(); | |
381 | packet_write_wait(); | |
382 | ||
383 | /* Enable compression now that we have replied if appropriate. */ | |
384 | if (enable_compression_after_reply) { | |
385 | enable_compression_after_reply = 0; | |
386 | packet_start_compression(compression_level); | |
387 | } | |
388 | } | |
389 | } | |
390 | ||
391 | /* | |
392 | * This is called to fork and execute a command when we have no tty. This | |
393 | * will call do_child from the child, and server_loop from the parent after | |
394 | * setting up file descriptors and such. | |
395 | */ | |
396 | void | |
397 | do_exec_no_pty(Session *s, const char *command) | |
398 | { | |
44a053a3 | 399 | pid_t pid; |
3c0ef626 | 400 | |
401 | #ifdef USE_PIPES | |
402 | int pin[2], pout[2], perr[2]; | |
403 | /* Allocate pipes for communicating with the program. */ | |
404 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
405 | packet_disconnect("Could not create pipes: %.100s", | |
406 | strerror(errno)); | |
407 | #else /* USE_PIPES */ | |
408 | int inout[2], err[2]; | |
409 | /* Uses socket pairs to communicate with the program. */ | |
410 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
411 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
412 | packet_disconnect("Could not create socket pairs: %.100s", | |
413 | strerror(errno)); | |
414 | #endif /* USE_PIPES */ | |
415 | if (s == NULL) | |
416 | fatal("do_exec_no_pty: no session"); | |
417 | ||
418 | session_proctitle(s); | |
419 | ||
420 | #if defined(USE_PAM) | |
540d72c3 | 421 | if (options.use_pam && !use_privsep) |
7cac2b65 | 422 | do_pam_setcred(1); |
3c0ef626 | 423 | #endif /* USE_PAM */ |
424 | ||
425 | /* Fork the child. */ | |
426 | if ((pid = fork()) == 0) { | |
540d72c3 | 427 | is_child = 1; |
d03f4262 | 428 | |
3c0ef626 | 429 | /* Child. Reinitialize the log since the pid has changed. */ |
430 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
431 | ||
432 | /* | |
433 | * Create a new session and process group since the 4.4BSD | |
434 | * setlogin() affects the entire process group. | |
435 | */ | |
436 | if (setsid() < 0) | |
437 | error("setsid failed: %.100s", strerror(errno)); | |
438 | ||
439 | #ifdef USE_PIPES | |
440 | /* | |
441 | * Redirect stdin. We close the parent side of the socket | |
442 | * pair, and make the child side the standard input. | |
443 | */ | |
444 | close(pin[1]); | |
445 | if (dup2(pin[0], 0) < 0) | |
446 | perror("dup2 stdin"); | |
447 | close(pin[0]); | |
448 | ||
449 | /* Redirect stdout. */ | |
450 | close(pout[0]); | |
451 | if (dup2(pout[1], 1) < 0) | |
452 | perror("dup2 stdout"); | |
453 | close(pout[1]); | |
454 | ||
455 | /* Redirect stderr. */ | |
456 | close(perr[0]); | |
457 | if (dup2(perr[1], 2) < 0) | |
458 | perror("dup2 stderr"); | |
459 | close(perr[1]); | |
460 | #else /* USE_PIPES */ | |
461 | /* | |
462 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
463 | * use the same socket, as some programs (particularly rdist) | |
464 | * seem to depend on it. | |
465 | */ | |
466 | close(inout[1]); | |
467 | close(err[1]); | |
468 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
469 | perror("dup2 stdin"); | |
470 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
471 | perror("dup2 stdout"); | |
472 | if (dup2(err[0], 2) < 0) /* stderr */ | |
473 | perror("dup2 stderr"); | |
474 | #endif /* USE_PIPES */ | |
475 | ||
d03f4262 | 476 | #ifdef _UNICOS |
477 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
478 | #endif | |
479 | ||
3c0ef626 | 480 | /* Do processing for the child (exec command etc). */ |
481 | do_child(s, command); | |
482 | /* NOTREACHED */ | |
483 | } | |
d03f4262 | 484 | #ifdef _UNICOS |
485 | signal(WJSIGNAL, cray_job_termination_handler); | |
486 | #endif /* _UNICOS */ | |
3c0ef626 | 487 | #ifdef HAVE_CYGWIN |
488 | if (is_winnt) | |
489 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
490 | #endif | |
491 | if (pid < 0) | |
492 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
493 | s->pid = pid; | |
494 | /* Set interactive/non-interactive mode. */ | |
495 | packet_set_interactive(s->display != NULL); | |
496 | #ifdef USE_PIPES | |
497 | /* We are the parent. Close the child sides of the pipes. */ | |
498 | close(pin[0]); | |
499 | close(pout[1]); | |
500 | close(perr[1]); | |
501 | ||
502 | if (compat20) { | |
503 | session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); | |
504 | } else { | |
505 | /* Enter the interactive session. */ | |
506 | server_loop(pid, pin[1], pout[0], perr[0]); | |
507 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ | |
508 | } | |
509 | #else /* USE_PIPES */ | |
510 | /* We are the parent. Close the child sides of the socket pairs. */ | |
511 | close(inout[0]); | |
512 | close(err[0]); | |
513 | ||
514 | /* | |
515 | * Enter the interactive session. Note: server_loop must be able to | |
516 | * handle the case that fdin and fdout are the same. | |
517 | */ | |
518 | if (compat20) { | |
519 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); | |
520 | } else { | |
521 | server_loop(pid, inout[1], inout[1], err[1]); | |
522 | /* server_loop has closed inout[1] and err[1]. */ | |
523 | } | |
524 | #endif /* USE_PIPES */ | |
525 | } | |
526 | ||
527 | /* | |
528 | * This is called to fork and execute a command when we have a tty. This | |
529 | * will call do_child from the child, and server_loop from the parent after | |
530 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
531 | * lastlog, and other such operations. | |
532 | */ | |
533 | void | |
534 | do_exec_pty(Session *s, const char *command) | |
535 | { | |
536 | int fdout, ptyfd, ttyfd, ptymaster; | |
537 | pid_t pid; | |
538 | ||
539 | if (s == NULL) | |
540 | fatal("do_exec_pty: no session"); | |
541 | ptyfd = s->ptyfd; | |
542 | ttyfd = s->ttyfd; | |
543 | ||
544 | #if defined(USE_PAM) | |
7cac2b65 | 545 | if (options.use_pam) { |
546 | do_pam_set_tty(s->tty); | |
540d72c3 | 547 | if (!use_privsep) |
548 | do_pam_setcred(1); | |
7cac2b65 | 549 | } |
3c0ef626 | 550 | #endif |
551 | ||
552 | /* Fork the child. */ | |
553 | if ((pid = fork()) == 0) { | |
540d72c3 | 554 | is_child = 1; |
3c0ef626 | 555 | |
556 | /* Child. Reinitialize the log because the pid has changed. */ | |
557 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
558 | /* Close the master side of the pseudo tty. */ | |
559 | close(ptyfd); | |
560 | ||
561 | /* Make the pseudo tty our controlling tty. */ | |
562 | pty_make_controlling_tty(&ttyfd, s->tty); | |
563 | ||
564 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ | |
565 | if (dup2(ttyfd, 0) < 0) | |
566 | error("dup2 stdin: %s", strerror(errno)); | |
567 | if (dup2(ttyfd, 1) < 0) | |
568 | error("dup2 stdout: %s", strerror(errno)); | |
569 | if (dup2(ttyfd, 2) < 0) | |
570 | error("dup2 stderr: %s", strerror(errno)); | |
571 | ||
572 | /* Close the extra descriptor for the pseudo tty. */ | |
573 | close(ttyfd); | |
574 | ||
575 | /* record login, etc. similar to login(1) */ | |
576 | #ifndef HAVE_OSF_SIA | |
d03f4262 | 577 | if (!(options.use_login && command == NULL)) { |
578 | #ifdef _UNICOS | |
579 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
580 | #endif /* _UNICOS */ | |
3c0ef626 | 581 | do_login(s, command); |
d03f4262 | 582 | } |
3c0ef626 | 583 | # ifdef LOGIN_NEEDS_UTMPX |
584 | else | |
585 | do_pre_login(s); | |
586 | # endif | |
587 | #endif | |
588 | ||
589 | /* Do common processing for the child, such as execing the command. */ | |
590 | do_child(s, command); | |
591 | /* NOTREACHED */ | |
592 | } | |
d03f4262 | 593 | #ifdef _UNICOS |
594 | signal(WJSIGNAL, cray_job_termination_handler); | |
595 | #endif /* _UNICOS */ | |
3c0ef626 | 596 | #ifdef HAVE_CYGWIN |
597 | if (is_winnt) | |
598 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
599 | #endif | |
600 | if (pid < 0) | |
601 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
602 | s->pid = pid; | |
603 | ||
604 | /* Parent. Close the slave side of the pseudo tty. */ | |
605 | close(ttyfd); | |
606 | ||
607 | /* | |
608 | * Create another descriptor of the pty master side for use as the | |
609 | * standard input. We could use the original descriptor, but this | |
610 | * simplifies code in server_loop. The descriptor is bidirectional. | |
611 | */ | |
612 | fdout = dup(ptyfd); | |
613 | if (fdout < 0) | |
614 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
615 | ||
616 | /* we keep a reference to the pty master */ | |
617 | ptymaster = dup(ptyfd); | |
618 | if (ptymaster < 0) | |
619 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
620 | s->ptymaster = ptymaster; | |
621 | ||
622 | /* Enter interactive session. */ | |
623 | packet_set_interactive(1); | |
624 | if (compat20) { | |
625 | session_set_fds(s, ptyfd, fdout, -1); | |
626 | } else { | |
627 | server_loop(pid, ptyfd, fdout, -1); | |
628 | /* server_loop _has_ closed ptyfd and fdout. */ | |
629 | } | |
630 | } | |
631 | ||
632 | #ifdef LOGIN_NEEDS_UTMPX | |
633 | static void | |
634 | do_pre_login(Session *s) | |
635 | { | |
636 | socklen_t fromlen; | |
637 | struct sockaddr_storage from; | |
638 | pid_t pid = getpid(); | |
639 | ||
640 | /* | |
641 | * Get IP address of client. If the connection is not a socket, let | |
642 | * the address be 0.0.0.0. | |
643 | */ | |
644 | memset(&from, 0, sizeof(from)); | |
d03f4262 | 645 | fromlen = sizeof(from); |
3c0ef626 | 646 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 647 | if (getpeername(packet_get_connection_in(), |
e9702f7d | 648 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 649 | debug("getpeername: %.100s", strerror(errno)); |
540d72c3 | 650 | cleanup_exit(255); |
3c0ef626 | 651 | } |
652 | } | |
653 | ||
654 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
7cac2b65 | 655 | get_remote_name_or_ip(utmp_len, options.use_dns), |
bfe49944 | 656 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 657 | } |
658 | #endif | |
659 | ||
660 | /* | |
661 | * This is called to fork and execute a command. If another command is | |
662 | * to be forced, execute that instead. | |
663 | */ | |
664 | void | |
665 | do_exec(Session *s, const char *command) | |
666 | { | |
667 | if (forced_command) { | |
668 | original_command = command; | |
669 | command = forced_command; | |
670 | debug("Forced command '%.900s'", command); | |
671 | } | |
672 | ||
7cac2b65 | 673 | #if defined(SESSION_HOOKS) |
674 | if (options.session_hooks_allow && | |
675 | (options.session_hooks_startup_cmd || | |
676 | options.session_hooks_shutdown_cmd)) | |
677 | { | |
678 | char env_file[1000]; | |
679 | struct stat st; | |
680 | do | |
681 | { | |
682 | snprintf(env_file, | |
683 | sizeof(env_file), | |
684 | "/tmp/ssh_env_%d%d%d", | |
685 | getuid(), | |
686 | getpid(), | |
687 | rand()); | |
688 | } while (stat(env_file, &st)==0); | |
689 | s->authctxt->session_env_file = strdup(env_file); | |
690 | } | |
691 | #endif | |
692 | ||
693 | #ifdef GSSAPI | |
694 | if (options.gss_authentication) { | |
695 | temporarily_use_uid(s->pw); | |
696 | ssh_gssapi_storecreds(); | |
697 | restore_uid(); | |
698 | } | |
699 | #endif | |
700 | ||
3c0ef626 | 701 | if (s->ttyfd != -1) |
702 | do_exec_pty(s, command); | |
703 | else | |
704 | do_exec_no_pty(s, command); | |
705 | ||
706 | original_command = NULL; | |
707 | } | |
708 | ||
e9702f7d | 709 | |
3c0ef626 | 710 | /* administrative, login(1)-like work */ |
711 | void | |
712 | do_login(Session *s, const char *command) | |
713 | { | |
714 | char *time_string; | |
3c0ef626 | 715 | socklen_t fromlen; |
716 | struct sockaddr_storage from; | |
3c0ef626 | 717 | struct passwd * pw = s->pw; |
718 | pid_t pid = getpid(); | |
719 | ||
720 | /* | |
721 | * Get IP address of client. If the connection is not a socket, let | |
722 | * the address be 0.0.0.0. | |
723 | */ | |
724 | memset(&from, 0, sizeof(from)); | |
bfe49944 | 725 | fromlen = sizeof(from); |
3c0ef626 | 726 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 727 | if (getpeername(packet_get_connection_in(), |
e9702f7d | 728 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 729 | debug("getpeername: %.100s", strerror(errno)); |
540d72c3 | 730 | cleanup_exit(255); |
3c0ef626 | 731 | } |
732 | } | |
733 | ||
3c0ef626 | 734 | /* Record that there was a login on that tty from the remote host. */ |
350391c5 | 735 | if (!use_privsep) |
736 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
737 | get_remote_name_or_ip(utmp_len, | |
7cac2b65 | 738 | options.use_dns), |
d03f4262 | 739 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 740 | |
741 | #ifdef USE_PAM | |
742 | /* | |
743 | * If password change is needed, do it now. | |
744 | * This needs to occur before the ~/.hushlogin check. | |
745 | */ | |
540d72c3 | 746 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
747 | display_loginmsg(); | |
3c0ef626 | 748 | do_pam_chauthtok(); |
540d72c3 | 749 | s->authctxt->force_pwchange = 0; |
7cac2b65 | 750 | /* XXX - signal [net] parent to enable forwardings */ |
3c0ef626 | 751 | } |
752 | #endif | |
753 | ||
754 | if (check_quietlogin(s, command)) | |
755 | return; | |
756 | ||
540d72c3 | 757 | display_loginmsg(); |
3c0ef626 | 758 | |
d03f4262 | 759 | #ifndef NO_SSH_LASTLOG |
350391c5 | 760 | if (options.print_lastlog && s->last_login_time != 0) { |
761 | time_string = ctime(&s->last_login_time); | |
3c0ef626 | 762 | if (strchr(time_string, '\n')) |
763 | *strchr(time_string, '\n') = 0; | |
350391c5 | 764 | if (strcmp(s->hostname, "") == 0) |
3c0ef626 | 765 | printf("Last login: %s\r\n", time_string); |
766 | else | |
350391c5 | 767 | printf("Last login: %s from %s\r\n", time_string, |
768 | s->hostname); | |
3c0ef626 | 769 | } |
d03f4262 | 770 | #endif /* NO_SSH_LASTLOG */ |
3c0ef626 | 771 | |
772 | do_motd(); | |
773 | } | |
774 | ||
775 | /* | |
776 | * Display the message of the day. | |
777 | */ | |
778 | void | |
779 | do_motd(void) | |
780 | { | |
781 | FILE *f; | |
782 | char buf[256]; | |
783 | ||
784 | if (options.print_motd) { | |
785 | #ifdef HAVE_LOGIN_CAP | |
786 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
787 | "/etc/motd"), "r"); | |
788 | #else | |
789 | f = fopen("/etc/motd", "r"); | |
790 | #endif | |
791 | if (f) { | |
792 | while (fgets(buf, sizeof(buf), f)) | |
793 | fputs(buf, stdout); | |
794 | fclose(f); | |
795 | } | |
796 | } | |
797 | } | |
798 | ||
799 | ||
800 | /* | |
801 | * Check for quiet login, either .hushlogin or command given. | |
802 | */ | |
803 | int | |
804 | check_quietlogin(Session *s, const char *command) | |
805 | { | |
806 | char buf[256]; | |
807 | struct passwd *pw = s->pw; | |
808 | struct stat st; | |
809 | ||
810 | /* Return 1 if .hushlogin exists or a command given. */ | |
811 | if (command != NULL) | |
812 | return 1; | |
813 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
814 | #ifdef HAVE_LOGIN_CAP | |
815 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
816 | return 1; | |
817 | #else | |
818 | if (stat(buf, &st) >= 0) | |
819 | return 1; | |
820 | #endif | |
821 | return 0; | |
822 | } | |
823 | ||
824 | /* | |
825 | * Sets the value of the given variable in the environment. If the variable | |
826 | * already exists, its value is overriden. | |
827 | */ | |
5598e598 | 828 | void |
3c0ef626 | 829 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
e9702f7d | 830 | const char *value) |
3c0ef626 | 831 | { |
3c0ef626 | 832 | char **env; |
29d88157 | 833 | u_int envsize; |
834 | u_int i, namelen; | |
3c0ef626 | 835 | |
7cac2b65 | 836 | /* |
837 | * If we're passed an uninitialized list, allocate a single null | |
838 | * entry before continuing. | |
839 | */ | |
840 | if (*envp == NULL && *envsizep == 0) { | |
841 | *envp = xmalloc(sizeof(char *)); | |
842 | *envp[0] = NULL; | |
843 | *envsizep = 1; | |
844 | } | |
845 | ||
3c0ef626 | 846 | /* |
847 | * Find the slot where the value should be stored. If the variable | |
848 | * already exists, we reuse the slot; otherwise we append a new slot | |
849 | * at the end of the array, expanding if necessary. | |
850 | */ | |
851 | env = *envp; | |
852 | namelen = strlen(name); | |
853 | for (i = 0; env[i]; i++) | |
854 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
855 | break; | |
856 | if (env[i]) { | |
857 | /* Reuse the slot. */ | |
858 | xfree(env[i]); | |
859 | } else { | |
860 | /* New variable. Expand if necessary. */ | |
29d88157 | 861 | envsize = *envsizep; |
862 | if (i >= envsize - 1) { | |
863 | if (envsize >= 1000) | |
864 | fatal("child_set_env: too many env vars"); | |
865 | envsize += 50; | |
866 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); | |
867 | *envsizep = envsize; | |
3c0ef626 | 868 | } |
869 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
870 | env[i + 1] = NULL; | |
871 | } | |
872 | ||
873 | /* Allocate space and format the variable in the appropriate slot. */ | |
874 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
875 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
876 | } | |
877 | ||
878 | /* | |
879 | * Reads environment variables from the given file and adds/overrides them | |
880 | * into the environment. If the file does not exist, this does nothing. | |
881 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
882 | * and assignments of the form name=value. No other forms are allowed. | |
883 | */ | |
884 | static void | |
885 | read_environment_file(char ***env, u_int *envsize, | |
e9702f7d | 886 | const char *filename) |
3c0ef626 | 887 | { |
888 | FILE *f; | |
889 | char buf[4096]; | |
890 | char *cp, *value; | |
276b07a3 | 891 | u_int lineno = 0; |
3c0ef626 | 892 | |
893 | f = fopen(filename, "r"); | |
894 | if (!f) | |
895 | return; | |
896 | ||
897 | while (fgets(buf, sizeof(buf), f)) { | |
276b07a3 | 898 | if (++lineno > 1000) |
899 | fatal("Too many lines in environment file %s", filename); | |
3c0ef626 | 900 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
901 | ; | |
902 | if (!*cp || *cp == '#' || *cp == '\n') | |
903 | continue; | |
904 | if (strchr(cp, '\n')) | |
905 | *strchr(cp, '\n') = '\0'; | |
906 | value = strchr(cp, '='); | |
907 | if (value == NULL) { | |
276b07a3 | 908 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
909 | filename); | |
3c0ef626 | 910 | continue; |
911 | } | |
912 | /* | |
913 | * Replace the equals sign by nul, and advance value to | |
914 | * the value string. | |
915 | */ | |
916 | *value = '\0'; | |
917 | value++; | |
918 | child_set_env(env, envsize, cp, value); | |
919 | } | |
920 | fclose(f); | |
921 | } | |
922 | ||
75be3237 | 923 | #ifdef SESSION_HOOKS |
924 | #define SSH_SESSION_ENV_FILE "SSH_SESSION_ENV_FILE" | |
925 | ||
926 | typedef enum { no_op, execute, clear_env, restore_env, | |
927 | read_env, save_or_rm_env } session_action_t; | |
928 | ||
929 | static session_action_t action_order[2][5] = { | |
930 | { clear_env, read_env, execute, save_or_rm_env, restore_env }, /*shutdown*/ | |
931 | { execute, read_env, save_or_rm_env, no_op, no_op } /*startup */ | |
932 | }; | |
933 | ||
934 | static | |
935 | void execute_session_hook(char* prog, Authctxt *authctxt, | |
936 | int startup, int save) | |
937 | { | |
938 | extern char **environ; | |
939 | ||
940 | struct stat st; | |
941 | char **saved_env, **tmpenv; | |
942 | char *env_file = authctxt->session_env_file; | |
943 | int i, status = 0; | |
944 | ||
945 | for (i=0; i<5; i++) | |
946 | { | |
947 | switch (action_order[startup][i]) | |
948 | { | |
949 | case no_op: | |
950 | break; | |
951 | ||
952 | case execute: | |
953 | { | |
954 | FILE* fp; | |
955 | char buf[1000]; | |
956 | ||
957 | snprintf(buf, | |
958 | sizeof(buf), | |
959 | "%s -c '%s'", | |
960 | authctxt->pw->pw_shell, | |
961 | prog); | |
962 | ||
963 | debug("executing session hook: [%s]", buf); | |
964 | setenv(SSH_SESSION_ENV_FILE, env_file, /* overwrite = */ 1); | |
965 | ||
966 | /* flusing is recommended in the popen(3) man page, to avoid | |
967 | intermingling of output */ | |
968 | fflush(stdout); | |
969 | fflush(stderr); | |
970 | if ((fp=popen(buf, "w")) == NULL) | |
971 | { | |
972 | perror("Unable to run session hook"); | |
973 | return; | |
974 | } | |
975 | status = pclose(fp); | |
976 | debug2("session hook executed, status=%d", status); | |
977 | unsetenv(SSH_SESSION_ENV_FILE); | |
978 | } | |
979 | break; | |
980 | ||
981 | case clear_env: | |
982 | saved_env = environ; | |
983 | tmpenv = (char**) malloc(sizeof(char*)); | |
984 | tmpenv[0] = NULL; | |
985 | environ = tmpenv; | |
986 | break; | |
987 | ||
988 | case restore_env: | |
989 | environ = saved_env; | |
990 | free(tmpenv); | |
991 | break; | |
992 | ||
993 | case read_env: | |
994 | if (status==0 && stat(env_file, &st)==0) | |
995 | { | |
996 | int envsize = 0; | |
997 | ||
998 | debug("reading environment from %s", env_file); | |
999 | while (environ[envsize++]) ; | |
1000 | read_environment_file(&environ, &envsize, env_file); | |
1001 | } | |
1002 | break; | |
1003 | ||
1004 | case save_or_rm_env: | |
1005 | if (status==0 && save) | |
1006 | { | |
1007 | FILE* fp; | |
1008 | int envcount=0; | |
1009 | ||
1010 | debug2("saving environment to %s", env_file); | |
1011 | if ((fp = fopen(env_file, "w")) == NULL) /* hmm: file perms? */ | |
1012 | { | |
1013 | perror("Unable to save session hook info"); | |
1014 | } | |
1015 | while (environ[envcount]) | |
1016 | { | |
1017 | fprintf(fp, "%s\n", environ[envcount++]); | |
1018 | } | |
1019 | fflush(fp); | |
1020 | fclose(fp); | |
1021 | } | |
1022 | else if (stat(env_file, &st)==0) | |
1023 | { | |
1024 | debug2("removing environment file %s", env_file); | |
1025 | remove(env_file); | |
1026 | } | |
1027 | break; | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | } | |
1032 | #endif | |
1033 | ||
7cac2b65 | 1034 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
1035 | /* | |
1036 | * Return named variable from specified environment, or NULL if not present. | |
1037 | */ | |
1038 | static char * | |
1039 | child_get_env(char **env, const char *name) | |
1040 | { | |
1041 | int i; | |
1042 | size_t len; | |
1043 | ||
1044 | len = strlen(name); | |
1045 | for (i=0; env[i] != NULL; i++) | |
1046 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
1047 | return(env[i] + len + 1); | |
1048 | return NULL; | |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * Read /etc/default/login. | |
1053 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
1054 | */ | |
1055 | static void | |
1056 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
1057 | { | |
1058 | char **tmpenv = NULL, *var; | |
29d88157 | 1059 | u_int i, tmpenvsize = 0; |
540d72c3 | 1060 | u_long mask; |
7cac2b65 | 1061 | |
1062 | /* | |
1063 | * We don't want to copy the whole file to the child's environment, | |
1064 | * so we use a temporary environment and copy the variables we're | |
1065 | * interested in. | |
1066 | */ | |
1067 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
1068 | ||
29d88157 | 1069 | if (tmpenv == NULL) |
1070 | return; | |
1071 | ||
7cac2b65 | 1072 | if (uid == 0) |
1073 | var = child_get_env(tmpenv, "SUPATH"); | |
1074 | else | |
1075 | var = child_get_env(tmpenv, "PATH"); | |
1076 | if (var != NULL) | |
1077 | child_set_env(env, envsize, "PATH", var); | |
540d72c3 | 1078 | |
7cac2b65 | 1079 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
1080 | if (sscanf(var, "%5lo", &mask) == 1) | |
540d72c3 | 1081 | umask((mode_t)mask); |
1082 | ||
7cac2b65 | 1083 | for (i = 0; tmpenv[i] != NULL; i++) |
1084 | xfree(tmpenv[i]); | |
1085 | xfree(tmpenv); | |
1086 | } | |
1087 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1088 | ||
e9702f7d | 1089 | void copy_environment(char **source, char ***env, u_int *envsize) |
3c0ef626 | 1090 | { |
e9702f7d | 1091 | char *var_name, *var_val; |
3c0ef626 | 1092 | int i; |
1093 | ||
e9702f7d | 1094 | if (source == NULL) |
3c0ef626 | 1095 | return; |
1096 | ||
e9702f7d | 1097 | for(i = 0; source[i] != NULL; i++) { |
1098 | var_name = xstrdup(source[i]); | |
1099 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
1100 | xfree(var_name); | |
3c0ef626 | 1101 | continue; |
3c0ef626 | 1102 | } |
e9702f7d | 1103 | *var_val++ = '\0'; |
3c0ef626 | 1104 | |
e9702f7d | 1105 | debug3("Copy environment: %s=%s", var_name, var_val); |
1106 | child_set_env(env, envsize, var_name, var_val); | |
540d72c3 | 1107 | |
e9702f7d | 1108 | xfree(var_name); |
3c0ef626 | 1109 | } |
3c0ef626 | 1110 | } |
1111 | ||
e9702f7d | 1112 | static char ** |
1113 | do_setup_env(Session *s, const char *shell) | |
3c0ef626 | 1114 | { |
3c0ef626 | 1115 | char buf[256]; |
e9702f7d | 1116 | u_int i, envsize; |
7cac2b65 | 1117 | char **env, *laddr, *path = NULL; |
e9702f7d | 1118 | struct passwd *pw = s->pw; |
3c0ef626 | 1119 | |
1120 | /* Initialize the environment. */ | |
1121 | envsize = 100; | |
1122 | env = xmalloc(envsize * sizeof(char *)); | |
1123 | env[0] = NULL; | |
1124 | ||
1125 | #ifdef HAVE_CYGWIN | |
1126 | /* | |
1127 | * The Windows environment contains some setting which are | |
1128 | * important for a running system. They must not be dropped. | |
1129 | */ | |
e9702f7d | 1130 | copy_environment(environ, &env, &envsize); |
3c0ef626 | 1131 | #endif |
1132 | ||
5598e598 | 1133 | #ifdef GSSAPI |
540d72c3 | 1134 | /* Allow any GSSAPI methods that we've used to alter |
5598e598 | 1135 | * the childs environment as they see fit |
1136 | */ | |
7cac2b65 | 1137 | ssh_gssapi_do_child(&env, &envsize); |
5598e598 | 1138 | #endif |
1139 | ||
3c0ef626 | 1140 | if (!options.use_login) { |
1141 | /* Set basic environment. */ | |
1142 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1143 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
bfe49944 | 1144 | #ifdef _AIX |
1145 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1146 | #endif | |
3c0ef626 | 1147 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
1148 | #ifdef HAVE_LOGIN_CAP | |
d03f4262 | 1149 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1150 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1151 | else | |
1152 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
3c0ef626 | 1153 | #else /* HAVE_LOGIN_CAP */ |
1154 | # ifndef HAVE_CYGWIN | |
1155 | /* | |
1156 | * There's no standard path on Windows. The path contains | |
1157 | * important components pointing to the system directories, | |
1158 | * needed for loading shared libraries. So the path better | |
1159 | * remains intact here. | |
1160 | */ | |
2a67a1d1 | 1161 | if (getenv("LD_LIBRARY_PATH")) |
1162 | child_set_env(&env, &envsize, "LD_LIBRARY_PATH", | |
1163 | getenv("LD_LIBRARY_PATH")); | |
7cac2b65 | 1164 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1165 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1166 | path = child_get_env(env, "PATH"); | |
1167 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1168 | if (path == NULL || *path == '\0') { | |
540d72c3 | 1169 | child_set_env(&env, &envsize, "PATH", |
7cac2b65 | 1170 | s->pw->pw_uid == 0 ? |
1171 | SUPERUSER_PATH : _PATH_STDPATH); | |
1172 | } | |
3c0ef626 | 1173 | # endif /* HAVE_CYGWIN */ |
1174 | #endif /* HAVE_LOGIN_CAP */ | |
1175 | ||
1176 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1177 | _PATH_MAILDIR, pw->pw_name); | |
1178 | child_set_env(&env, &envsize, "MAIL", buf); | |
1179 | ||
1180 | /* Normal systems set SHELL by default. */ | |
1181 | child_set_env(&env, &envsize, "SHELL", shell); | |
1182 | } | |
1183 | if (getenv("TZ")) | |
1184 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1185 | ||
1186 | /* Set custom environment options from RSA authentication. */ | |
1187 | if (!options.use_login) { | |
1188 | while (custom_environment) { | |
1189 | struct envstring *ce = custom_environment; | |
d03f4262 | 1190 | char *str = ce->s; |
e9702f7d | 1191 | |
d03f4262 | 1192 | for (i = 0; str[i] != '=' && str[i]; i++) |
3c0ef626 | 1193 | ; |
d03f4262 | 1194 | if (str[i] == '=') { |
1195 | str[i] = 0; | |
1196 | child_set_env(&env, &envsize, str, str + i + 1); | |
3c0ef626 | 1197 | } |
1198 | custom_environment = ce->next; | |
1199 | xfree(ce->s); | |
1200 | xfree(ce); | |
1201 | } | |
1202 | } | |
1203 | ||
d03f4262 | 1204 | /* SSH_CLIENT deprecated */ |
3c0ef626 | 1205 | snprintf(buf, sizeof buf, "%.50s %d %d", |
e9702f7d | 1206 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
3c0ef626 | 1207 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1208 | ||
bfe49944 | 1209 | laddr = get_local_ipaddr(packet_get_connection_in()); |
d03f4262 | 1210 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
bfe49944 | 1211 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1212 | xfree(laddr); | |
d03f4262 | 1213 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1214 | ||
3c0ef626 | 1215 | if (s->ttyfd != -1) |
1216 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1217 | if (s->term) | |
1218 | child_set_env(&env, &envsize, "TERM", s->term); | |
1219 | if (s->display) | |
1220 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
1221 | if (original_command) | |
1222 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1223 | original_command); | |
1224 | ||
d03f4262 | 1225 | #ifdef _UNICOS |
1226 | if (cray_tmpdir[0] != '\0') | |
1227 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1228 | #endif /* _UNICOS */ | |
1229 | ||
3c0ef626 | 1230 | #ifdef _AIX |
e9702f7d | 1231 | { |
1232 | char *cp; | |
1233 | ||
1234 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1235 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1236 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1237 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1238 | read_environment_file(&env, &envsize, "/etc/environment"); | |
1239 | } | |
3c0ef626 | 1240 | #endif |
3c0ef626 | 1241 | #ifdef KRB5 |
1242 | if (s->authctxt->krb5_ticket_file) | |
1243 | child_set_env(&env, &envsize, "KRB5CCNAME", | |
1244 | s->authctxt->krb5_ticket_file); | |
1245 | #endif | |
1246 | #ifdef USE_PAM | |
d03f4262 | 1247 | /* |
1248 | * Pull in any environment variables that may have | |
1249 | * been set by PAM. | |
1250 | */ | |
7cac2b65 | 1251 | if (options.use_pam) { |
540d72c3 | 1252 | char **p; |
d03f4262 | 1253 | |
540d72c3 | 1254 | p = fetch_pam_child_environment(); |
1255 | copy_environment(p, &env, &envsize); | |
1256 | free_pam_environment(p); | |
1257 | ||
1258 | p = fetch_pam_environment(); | |
d03f4262 | 1259 | copy_environment(p, &env, &envsize); |
1260 | free_pam_environment(p); | |
1261 | } | |
3c0ef626 | 1262 | #endif /* USE_PAM */ |
1263 | ||
44a053a3 | 1264 | if (auth_sock_name != NULL) |
3c0ef626 | 1265 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
44a053a3 | 1266 | auth_sock_name); |
3c0ef626 | 1267 | |
1268 | /* read $HOME/.ssh/environment. */ | |
d03f4262 | 1269 | if (options.permit_user_env && !options.use_login) { |
3c0ef626 | 1270 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
d03f4262 | 1271 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
3c0ef626 | 1272 | read_environment_file(&env, &envsize, buf); |
1273 | } | |
1274 | if (debug_flag) { | |
1275 | /* dump the environment */ | |
1276 | fprintf(stderr, "Environment:\n"); | |
1277 | for (i = 0; env[i]; i++) | |
1278 | fprintf(stderr, " %.200s\n", env[i]); | |
1279 | } | |
e9702f7d | 1280 | return env; |
1281 | } | |
1282 | ||
1283 | /* | |
1284 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1285 | * first in this order). | |
1286 | */ | |
1287 | static void | |
1288 | do_rc_files(Session *s, const char *shell) | |
1289 | { | |
1290 | FILE *f = NULL; | |
1291 | char cmd[1024]; | |
1292 | int do_xauth; | |
1293 | struct stat st; | |
1294 | ||
1295 | do_xauth = | |
1296 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1297 | ||
1298 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1299 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1300 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1301 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1302 | if (debug_flag) | |
1303 | fprintf(stderr, "Running %s\n", cmd); | |
1304 | f = popen(cmd, "w"); | |
1305 | if (f) { | |
1306 | if (do_xauth) | |
1307 | fprintf(f, "%s %s\n", s->auth_proto, | |
1308 | s->auth_data); | |
1309 | pclose(f); | |
1310 | } else | |
1311 | fprintf(stderr, "Could not run %s\n", | |
1312 | _PATH_SSH_USER_RC); | |
1313 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1314 | if (debug_flag) | |
1315 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1316 | _PATH_SSH_SYSTEM_RC); | |
1317 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1318 | if (f) { | |
1319 | if (do_xauth) | |
1320 | fprintf(f, "%s %s\n", s->auth_proto, | |
1321 | s->auth_data); | |
1322 | pclose(f); | |
1323 | } else | |
1324 | fprintf(stderr, "Could not run %s\n", | |
1325 | _PATH_SSH_SYSTEM_RC); | |
1326 | } else if (do_xauth && options.xauth_location != NULL) { | |
1327 | /* Add authority data to .Xauthority if appropriate. */ | |
1328 | if (debug_flag) { | |
1329 | fprintf(stderr, | |
bfe49944 | 1330 | "Running %.500s remove %.100s\n", |
540d72c3 | 1331 | options.xauth_location, s->auth_display); |
bfe49944 | 1332 | fprintf(stderr, |
1333 | "%.500s add %.100s %.100s %.100s\n", | |
e9702f7d | 1334 | options.xauth_location, s->auth_display, |
1335 | s->auth_proto, s->auth_data); | |
1336 | } | |
1337 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1338 | options.xauth_location); | |
1339 | f = popen(cmd, "w"); | |
1340 | if (f) { | |
bfe49944 | 1341 | fprintf(f, "remove %s\n", |
1342 | s->auth_display); | |
e9702f7d | 1343 | fprintf(f, "add %s %s %s\n", |
1344 | s->auth_display, s->auth_proto, | |
1345 | s->auth_data); | |
1346 | pclose(f); | |
1347 | } else { | |
1348 | fprintf(stderr, "Could not run %s\n", | |
1349 | cmd); | |
1350 | } | |
1351 | } | |
1352 | } | |
1353 | ||
1354 | static void | |
1355 | do_nologin(struct passwd *pw) | |
1356 | { | |
1357 | FILE *f = NULL; | |
1358 | char buf[1024]; | |
1359 | ||
1360 | #ifdef HAVE_LOGIN_CAP | |
1361 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1362 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1363 | _PATH_NOLOGIN), "r"); | |
1364 | #else | |
1365 | if (pw->pw_uid) | |
1366 | f = fopen(_PATH_NOLOGIN, "r"); | |
1367 | #endif | |
1368 | if (f) { | |
1369 | /* /etc/nologin exists. Print its contents and exit. */ | |
7cac2b65 | 1370 | logit("User %.100s not allowed because %s exists", |
d03f4262 | 1371 | pw->pw_name, _PATH_NOLOGIN); |
e9702f7d | 1372 | while (fgets(buf, sizeof(buf), f)) |
1373 | fputs(buf, stderr); | |
1374 | fclose(f); | |
bfe49944 | 1375 | fflush(NULL); |
e9702f7d | 1376 | exit(254); |
1377 | } | |
1378 | } | |
1379 | ||
1380 | /* Set login name, uid, gid, and groups. */ | |
350391c5 | 1381 | void |
e9702f7d | 1382 | do_setusercontext(struct passwd *pw) |
1383 | { | |
bfe49944 | 1384 | #ifndef HAVE_CYGWIN |
1385 | if (getuid() == 0 || geteuid() == 0) | |
e9702f7d | 1386 | #endif /* HAVE_CYGWIN */ |
bfe49944 | 1387 | { |
1388 | ||
44a053a3 | 1389 | #ifdef HAVE_SETPCRED |
7cac2b65 | 1390 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1391 | fatal("Failed to set process credentials"); | |
44a053a3 | 1392 | #endif /* HAVE_SETPCRED */ |
e9702f7d | 1393 | #ifdef HAVE_LOGIN_CAP |
d03f4262 | 1394 | # ifdef __bsdi__ |
276b07a3 | 1395 | setpgid(0, 0); |
d03f4262 | 1396 | # endif |
540d72c3 | 1397 | # ifdef USE_PAM |
1398 | if (options.use_pam) { | |
1399 | do_pam_session(); | |
1400 | do_pam_setcred(0); | |
1401 | } | |
1402 | # endif /* USE_PAM */ | |
e9702f7d | 1403 | if (setusercontext(lc, pw, pw->pw_uid, |
1404 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1405 | perror("unable to set user context"); | |
1406 | exit(1); | |
1407 | } | |
1408 | #else | |
1409 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1410 | /* Sets login uid for accounting */ | |
1411 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1412 | error("setluid: %s", strerror(errno)); | |
1413 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1414 | ||
1415 | if (setlogin(pw->pw_name) < 0) | |
1416 | error("setlogin failed: %s", strerror(errno)); | |
1417 | if (setgid(pw->pw_gid) < 0) { | |
1418 | perror("setgid"); | |
1419 | exit(1); | |
1420 | } | |
1421 | /* Initialize the group list. */ | |
1422 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1423 | perror("initgroups"); | |
1424 | exit(1); | |
1425 | } | |
1426 | endgrent(); | |
1427 | # ifdef USE_PAM | |
1428 | /* | |
540d72c3 | 1429 | * PAM credentials may take the form of supplementary groups. |
e9702f7d | 1430 | * These will have been wiped by the above initgroups() call. |
1431 | * Reestablish them here. | |
1432 | */ | |
7cac2b65 | 1433 | if (options.use_pam) { |
1434 | do_pam_session(); | |
1435 | do_pam_setcred(0); | |
1436 | } | |
e9702f7d | 1437 | # endif /* USE_PAM */ |
1438 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1439 | irix_setusercontext(pw); | |
1440 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
276b07a3 | 1441 | # ifdef _AIX |
d03f4262 | 1442 | aix_usrinfo(pw); |
276b07a3 | 1443 | # endif /* _AIX */ |
e9702f7d | 1444 | /* Permanently switch to the desired uid. */ |
1445 | permanently_set_uid(pw); | |
1446 | #endif | |
1447 | } | |
bfe49944 | 1448 | |
1449 | #ifdef HAVE_CYGWIN | |
1450 | if (is_winnt) | |
1451 | #endif | |
e9702f7d | 1452 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1453 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1454 | } | |
1455 | ||
540d72c3 | 1456 | static void |
1457 | do_pwchange(Session *s) | |
1458 | { | |
1459 | fprintf(stderr, "WARNING: Your password has expired.\n"); | |
1460 | if (s->ttyfd != -1) { | |
1461 | fprintf(stderr, | |
1462 | "You must change your password now and login again!\n"); | |
1463 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); | |
1464 | perror("passwd"); | |
1465 | } else { | |
1466 | fprintf(stderr, | |
1467 | "Password change required but no TTY available.\n"); | |
1468 | } | |
1469 | exit(1); | |
1470 | } | |
1471 | ||
350391c5 | 1472 | static void |
1473 | launch_login(struct passwd *pw, const char *hostname) | |
1474 | { | |
1475 | /* Launch login(1). */ | |
1476 | ||
44a053a3 | 1477 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
350391c5 | 1478 | #ifdef xxxLOGIN_NEEDS_TERM |
44a053a3 | 1479 | (s->term ? s->term : "unknown"), |
350391c5 | 1480 | #endif /* LOGIN_NEEDS_TERM */ |
1481 | #ifdef LOGIN_NO_ENDOPT | |
1482 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1483 | #else | |
1484 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1485 | #endif | |
1486 | ||
1487 | /* Login couldn't be executed, die. */ | |
1488 | ||
1489 | perror("login"); | |
1490 | exit(1); | |
1491 | } | |
1492 | ||
540d72c3 | 1493 | static void |
1494 | child_close_fds(void) | |
1495 | { | |
1496 | int i; | |
1497 | ||
1498 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1499 | close(packet_get_connection_in()); | |
1500 | else { | |
1501 | close(packet_get_connection_in()); | |
1502 | close(packet_get_connection_out()); | |
1503 | } | |
1504 | /* | |
1505 | * Close all descriptors related to channels. They will still remain | |
1506 | * open in the parent. | |
1507 | */ | |
1508 | /* XXX better use close-on-exec? -markus */ | |
1509 | channel_close_all(); | |
1510 | ||
1511 | /* | |
1512 | * Close any extra file descriptors. Note that there may still be | |
1513 | * descriptors left by system functions. They will be closed later. | |
1514 | */ | |
1515 | endpwent(); | |
1516 | ||
1517 | /* | |
1518 | * Close any extra open file descriptors so that we don\'t have them | |
1519 | * hanging around in clients. Note that we want to do this after | |
1520 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1521 | * descriptors open. | |
1522 | */ | |
1523 | for (i = 3; i < 64; i++) | |
1524 | close(i); | |
1525 | } | |
1526 | ||
e9702f7d | 1527 | /* |
1528 | * Performs common processing for the child, such as setting up the | |
1529 | * environment, closing extra file descriptors, setting the user and group | |
1530 | * ids, and executing the command or shell. | |
1531 | */ | |
1532 | void | |
1533 | do_child(Session *s, const char *command) | |
1534 | { | |
1535 | extern char **environ; | |
1536 | char **env; | |
1537 | char *argv[10]; | |
1538 | const char *shell, *shell0, *hostname = NULL; | |
1539 | struct passwd *pw = s->pw; | |
e9702f7d | 1540 | |
62eb343a | 1541 | #ifdef AFS_KRB5 |
1542 | /* Default place to look for aklog. */ | |
1543 | #ifdef AKLOG_PATH | |
1544 | #define KPROGDIR AKLOG_PATH | |
1545 | #else | |
1546 | #define KPROGDIR "/usr/bin/aklog" | |
1547 | #endif /* AKLOG_PATH */ | |
1548 | ||
1549 | struct stat st; | |
1550 | char *aklog_path; | |
1551 | #endif /* AFS_KRB5 */ | |
1552 | ||
e9702f7d | 1553 | /* remove hostkey from the child's memory */ |
1554 | destroy_sensitive_data(); | |
1555 | ||
540d72c3 | 1556 | /* Force a password change */ |
1557 | if (s->authctxt->force_pwchange) { | |
1558 | do_setusercontext(pw); | |
1559 | child_close_fds(); | |
1560 | do_pwchange(s); | |
1561 | exit(1); | |
1562 | } | |
1563 | ||
e9702f7d | 1564 | /* login(1) is only called if we execute the login shell */ |
1565 | if (options.use_login && command != NULL) | |
1566 | options.use_login = 0; | |
1567 | ||
d03f4262 | 1568 | #ifdef _UNICOS |
1569 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1570 | #endif /* _UNICOS */ | |
1571 | ||
e9702f7d | 1572 | /* |
1573 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1574 | * switch, so we let login(1) to this for us. | |
1575 | */ | |
1576 | if (!options.use_login) { | |
1577 | #ifdef HAVE_OSF_SIA | |
bfe49944 | 1578 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
e9702f7d | 1579 | if (!check_quietlogin(s, command)) |
1580 | do_motd(); | |
1581 | #else /* HAVE_OSF_SIA */ | |
1582 | do_nologin(pw); | |
e9702f7d | 1583 | do_setusercontext(pw); |
1584 | #endif /* HAVE_OSF_SIA */ | |
1585 | } | |
1586 | ||
1587 | /* | |
1588 | * Get the shell from the password data. An empty shell field is | |
1589 | * legal, and means /bin/sh. | |
1590 | */ | |
1591 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
bfe49944 | 1592 | |
1593 | /* | |
1594 | * Make sure $SHELL points to the shell from the password file, | |
1595 | * even if shell is overridden from login.conf | |
1596 | */ | |
1597 | env = do_setup_env(s, shell); | |
1598 | ||
e9702f7d | 1599 | #ifdef HAVE_LOGIN_CAP |
1600 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1601 | #endif | |
1602 | ||
3c0ef626 | 1603 | /* we have to stash the hostname before we close our socket. */ |
1604 | if (options.use_login) | |
1605 | hostname = get_remote_name_or_ip(utmp_len, | |
7cac2b65 | 1606 | options.use_dns); |
3c0ef626 | 1607 | /* |
1608 | * Close the connection descriptors; note that this is the child, and | |
1609 | * the server will still have the socket open, and it is important | |
1610 | * that we do not shutdown it. Note that the descriptors cannot be | |
1611 | * closed before building the environment, as we call | |
1612 | * get_remote_ipaddr there. | |
1613 | */ | |
540d72c3 | 1614 | child_close_fds(); |
3c0ef626 | 1615 | |
1616 | /* | |
540d72c3 | 1617 | * Must take new environment into use so that .ssh/rc, |
1618 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
3c0ef626 | 1619 | */ |
540d72c3 | 1620 | environ = env; |
3c0ef626 | 1621 | |
540d72c3 | 1622 | #if defined(KRB5) && defined(USE_AFS) |
3c0ef626 | 1623 | /* |
540d72c3 | 1624 | * At this point, we check to see if AFS is active and if we have |
1625 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1626 | * if we can (and need to) extend the ticket into an AFS token. If | |
1627 | * we don't do this, we run into potential problems if the user's | |
1628 | * home directory is in AFS and it's not world-readable. | |
3c0ef626 | 1629 | */ |
3c0ef626 | 1630 | |
540d72c3 | 1631 | if (options.kerberos_get_afs_token && k_hasafs() && |
1632 | (s->authctxt->krb5_ctx != NULL)) { | |
1633 | char cell[64]; | |
1634 | ||
1635 | debug("Getting AFS token"); | |
1636 | ||
1637 | k_setpag(); | |
1638 | ||
1639 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1640 | krb5_afslog(s->authctxt->krb5_ctx, | |
1641 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1642 | ||
1643 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1644 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1645 | } | |
1646 | #endif | |
3c0ef626 | 1647 | |
62eb343a | 1648 | #ifdef AFS_KRB5 |
1649 | ||
1650 | /* User has authenticated, and if a ticket was going to be | |
1651 | * passed we would have it. KRB5CCNAME should already be set. | |
1652 | * Now try to get an AFS token using aklog. | |
1653 | */ | |
1654 | if (k_hasafs()) { /* Do we have AFS? */ | |
1655 | ||
1656 | aklog_path = xstrdup(KPROGDIR); | |
1657 | ||
1658 | /* | |
1659 | * Make sure it exists before we try to run it | |
1660 | */ | |
1661 | if (stat(aklog_path, &st) == 0) { | |
1662 | debug("Running %s to get afs token.",aklog_path); | |
1663 | system(aklog_path); | |
1664 | } else { | |
1665 | debug("%s does not exist.",aklog_path); | |
1666 | } | |
1667 | ||
1668 | xfree(aklog_path); | |
1669 | } | |
1670 | #endif /* AFS_KRB5 */ | |
1671 | ||
75be3237 | 1672 | #ifdef SESSION_HOOKS |
1673 | if (options.session_hooks_allow && | |
1674 | options.session_hooks_startup_cmd) | |
1675 | { | |
1676 | execute_session_hook(options.session_hooks_startup_cmd, | |
1677 | s->authctxt, | |
1678 | /* startup = */ 1, | |
1679 | options.session_hooks_shutdown_cmd != NULL); | |
1680 | } | |
1681 | #endif | |
3c0ef626 | 1682 | |
1683 | /* Change current directory to the user\'s home directory. */ | |
1684 | if (chdir(pw->pw_dir) < 0) { | |
1685 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1686 | pw->pw_dir, strerror(errno)); | |
1687 | #ifdef HAVE_LOGIN_CAP | |
1688 | if (login_getcapbool(lc, "requirehome", 0)) | |
1689 | exit(1); | |
1690 | #endif | |
1691 | } | |
1692 | ||
e9702f7d | 1693 | if (!options.use_login) |
1694 | do_rc_files(s, shell); | |
3c0ef626 | 1695 | |
1696 | /* restore SIGPIPE for child */ | |
1697 | signal(SIGPIPE, SIG_DFL); | |
1698 | ||
e9702f7d | 1699 | if (options.use_login) { |
350391c5 | 1700 | launch_login(pw, hostname); |
1701 | /* NEVERREACHED */ | |
e9702f7d | 1702 | } |
1703 | ||
1704 | /* Get the last component of the shell name. */ | |
1705 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1706 | shell0++; | |
1707 | else | |
1708 | shell0 = shell; | |
1709 | ||
3c0ef626 | 1710 | /* |
1711 | * If we have no command, execute the shell. In this case, the shell | |
1712 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1713 | * this is a login shell. | |
1714 | */ | |
1715 | if (!command) { | |
e9702f7d | 1716 | char argv0[256]; |
3c0ef626 | 1717 | |
e9702f7d | 1718 | /* Start the shell. Set initial character to '-'. */ |
1719 | argv0[0] = '-'; | |
3c0ef626 | 1720 | |
e9702f7d | 1721 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1722 | >= sizeof(argv0) - 1) { | |
1723 | errno = EINVAL; | |
3c0ef626 | 1724 | perror(shell); |
1725 | exit(1); | |
e9702f7d | 1726 | } |
3c0ef626 | 1727 | |
e9702f7d | 1728 | /* Execute the shell. */ |
1729 | argv[0] = argv0; | |
1730 | argv[1] = NULL; | |
5ab1e3bd | 1731 | execve(shell, argv, environ); |
3c0ef626 | 1732 | |
e9702f7d | 1733 | /* Executing the shell failed. */ |
1734 | perror(shell); | |
1735 | exit(1); | |
3c0ef626 | 1736 | } |
1737 | /* | |
1738 | * Execute the command using the user's shell. This uses the -c | |
1739 | * option to execute the command. | |
1740 | */ | |
e9702f7d | 1741 | argv[0] = (char *) shell0; |
3c0ef626 | 1742 | argv[1] = "-c"; |
1743 | argv[2] = (char *) command; | |
1744 | argv[3] = NULL; | |
5ab1e3bd | 1745 | execve(shell, argv, environ); |
3c0ef626 | 1746 | perror(shell); |
1747 | exit(1); | |
1748 | } | |
1749 | ||
1750 | Session * | |
1751 | session_new(void) | |
1752 | { | |
1753 | int i; | |
1754 | static int did_init = 0; | |
1755 | if (!did_init) { | |
1756 | debug("session_new: init"); | |
e9702f7d | 1757 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1758 | sessions[i].used = 0; |
1759 | } | |
1760 | did_init = 1; | |
1761 | } | |
e9702f7d | 1762 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1763 | Session *s = &sessions[i]; |
1764 | if (! s->used) { | |
1765 | memset(s, 0, sizeof(*s)); | |
1766 | s->chanid = -1; | |
1767 | s->ptyfd = -1; | |
1768 | s->ttyfd = -1; | |
1769 | s->used = 1; | |
1770 | s->self = i; | |
1771 | debug("session_new: session %d", i); | |
1772 | return s; | |
1773 | } | |
1774 | } | |
1775 | return NULL; | |
1776 | } | |
1777 | ||
1778 | static void | |
1779 | session_dump(void) | |
1780 | { | |
1781 | int i; | |
e9702f7d | 1782 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1783 | Session *s = &sessions[i]; |
44a053a3 | 1784 | debug("dump: used %d session %d %p channel %d pid %ld", |
3c0ef626 | 1785 | s->used, |
1786 | s->self, | |
1787 | s, | |
1788 | s->chanid, | |
44a053a3 | 1789 | (long)s->pid); |
3c0ef626 | 1790 | } |
1791 | } | |
1792 | ||
1793 | int | |
1794 | session_open(Authctxt *authctxt, int chanid) | |
1795 | { | |
1796 | Session *s = session_new(); | |
1797 | debug("session_open: channel %d", chanid); | |
1798 | if (s == NULL) { | |
1799 | error("no more sessions"); | |
1800 | return 0; | |
1801 | } | |
1802 | s->authctxt = authctxt; | |
1803 | s->pw = authctxt->pw; | |
540d72c3 | 1804 | if (s->pw == NULL || !authctxt->valid) |
3c0ef626 | 1805 | fatal("no user for session %d", s->self); |
1806 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1807 | s->chanid = chanid; | |
1808 | return 1; | |
1809 | } | |
1810 | ||
350391c5 | 1811 | Session * |
1812 | session_by_tty(char *tty) | |
1813 | { | |
1814 | int i; | |
1815 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1816 | Session *s = &sessions[i]; | |
1817 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1818 | debug("session_by_tty: session %d tty %s", i, tty); | |
1819 | return s; | |
1820 | } | |
1821 | } | |
1822 | debug("session_by_tty: unknown tty %.100s", tty); | |
1823 | session_dump(); | |
1824 | return NULL; | |
1825 | } | |
1826 | ||
3c0ef626 | 1827 | static Session * |
1828 | session_by_channel(int id) | |
1829 | { | |
1830 | int i; | |
e9702f7d | 1831 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1832 | Session *s = &sessions[i]; |
1833 | if (s->used && s->chanid == id) { | |
1834 | debug("session_by_channel: session %d channel %d", i, id); | |
1835 | return s; | |
1836 | } | |
1837 | } | |
1838 | debug("session_by_channel: unknown channel %d", id); | |
1839 | session_dump(); | |
1840 | return NULL; | |
1841 | } | |
1842 | ||
1843 | static Session * | |
1844 | session_by_pid(pid_t pid) | |
1845 | { | |
1846 | int i; | |
44a053a3 | 1847 | debug("session_by_pid: pid %ld", (long)pid); |
e9702f7d | 1848 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1849 | Session *s = &sessions[i]; |
1850 | if (s->used && s->pid == pid) | |
1851 | return s; | |
1852 | } | |
44a053a3 | 1853 | error("session_by_pid: unknown pid %ld", (long)pid); |
3c0ef626 | 1854 | session_dump(); |
1855 | return NULL; | |
1856 | } | |
1857 | ||
1858 | static int | |
1859 | session_window_change_req(Session *s) | |
1860 | { | |
1861 | s->col = packet_get_int(); | |
1862 | s->row = packet_get_int(); | |
1863 | s->xpixel = packet_get_int(); | |
1864 | s->ypixel = packet_get_int(); | |
e9702f7d | 1865 | packet_check_eom(); |
3c0ef626 | 1866 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1867 | return 1; | |
1868 | } | |
1869 | ||
1870 | static int | |
1871 | session_pty_req(Session *s) | |
1872 | { | |
1873 | u_int len; | |
1874 | int n_bytes; | |
1875 | ||
1876 | if (no_pty_flag) { | |
1877 | debug("Allocating a pty not permitted for this authentication."); | |
1878 | return 0; | |
1879 | } | |
1880 | if (s->ttyfd != -1) { | |
1881 | packet_disconnect("Protocol error: you already have a pty."); | |
1882 | return 0; | |
1883 | } | |
350391c5 | 1884 | /* Get the time and hostname when the user last logged in. */ |
1885 | if (options.print_lastlog) { | |
1886 | s->hostname[0] = '\0'; | |
1887 | s->last_login_time = get_last_login_time(s->pw->pw_uid, | |
1888 | s->pw->pw_name, s->hostname, sizeof(s->hostname)); | |
1889 | } | |
3c0ef626 | 1890 | |
1891 | s->term = packet_get_string(&len); | |
1892 | ||
1893 | if (compat20) { | |
1894 | s->col = packet_get_int(); | |
1895 | s->row = packet_get_int(); | |
1896 | } else { | |
1897 | s->row = packet_get_int(); | |
1898 | s->col = packet_get_int(); | |
1899 | } | |
1900 | s->xpixel = packet_get_int(); | |
1901 | s->ypixel = packet_get_int(); | |
1902 | ||
1903 | if (strcmp(s->term, "") == 0) { | |
1904 | xfree(s->term); | |
1905 | s->term = NULL; | |
1906 | } | |
1907 | ||
1908 | /* Allocate a pty and open it. */ | |
1909 | debug("Allocating pty."); | |
350391c5 | 1910 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
3c0ef626 | 1911 | if (s->term) |
1912 | xfree(s->term); | |
1913 | s->term = NULL; | |
1914 | s->ptyfd = -1; | |
1915 | s->ttyfd = -1; | |
1916 | error("session_pty_req: session %d alloc failed", s->self); | |
1917 | return 0; | |
1918 | } | |
1919 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1920 | ||
1921 | /* for SSH1 the tty modes length is not given */ | |
1922 | if (!compat20) | |
1923 | n_bytes = packet_remaining(); | |
1924 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1925 | ||
350391c5 | 1926 | if (!use_privsep) |
1927 | pty_setowner(s->pw, s->tty); | |
3c0ef626 | 1928 | |
1929 | /* Set window size from the packet. */ | |
1930 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1931 | ||
e9702f7d | 1932 | packet_check_eom(); |
3c0ef626 | 1933 | session_proctitle(s); |
1934 | return 1; | |
1935 | } | |
1936 | ||
1937 | static int | |
1938 | session_subsystem_req(Session *s) | |
1939 | { | |
1940 | struct stat st; | |
1941 | u_int len; | |
1942 | int success = 0; | |
1943 | char *cmd, *subsys = packet_get_string(&len); | |
1944 | int i; | |
1945 | ||
e9702f7d | 1946 | packet_check_eom(); |
7cac2b65 | 1947 | logit("subsystem request for %.100s", subsys); |
3c0ef626 | 1948 | |
1949 | for (i = 0; i < options.num_subsystems; i++) { | |
1950 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1951 | cmd = options.subsystem_command[i]; | |
1952 | if (stat(cmd, &st) < 0) { | |
1953 | error("subsystem: cannot stat %s: %s", cmd, | |
1954 | strerror(errno)); | |
1955 | break; | |
1956 | } | |
1957 | debug("subsystem: exec() %s", cmd); | |
1958 | s->is_subsystem = 1; | |
1959 | do_exec(s, cmd); | |
1960 | success = 1; | |
e9702f7d | 1961 | break; |
3c0ef626 | 1962 | } |
1963 | } | |
1964 | ||
1965 | if (!success) | |
7cac2b65 | 1966 | logit("subsystem request for %.100s failed, subsystem not found", |
3c0ef626 | 1967 | subsys); |
1968 | ||
1969 | xfree(subsys); | |
1970 | return success; | |
1971 | } | |
1972 | ||
1973 | static int | |
1974 | session_x11_req(Session *s) | |
1975 | { | |
1976 | int success; | |
1977 | ||
1978 | s->single_connection = packet_get_char(); | |
1979 | s->auth_proto = packet_get_string(NULL); | |
1980 | s->auth_data = packet_get_string(NULL); | |
1981 | s->screen = packet_get_int(); | |
e9702f7d | 1982 | packet_check_eom(); |
3c0ef626 | 1983 | |
1984 | success = session_setup_x11fwd(s); | |
1985 | if (!success) { | |
1986 | xfree(s->auth_proto); | |
1987 | xfree(s->auth_data); | |
1988 | s->auth_proto = NULL; | |
1989 | s->auth_data = NULL; | |
1990 | } | |
1991 | return success; | |
1992 | } | |
1993 | ||
1994 | static int | |
1995 | session_shell_req(Session *s) | |
1996 | { | |
e9702f7d | 1997 | packet_check_eom(); |
3c0ef626 | 1998 | do_exec(s, NULL); |
1999 | return 1; | |
2000 | } | |
2001 | ||
2002 | static int | |
2003 | session_exec_req(Session *s) | |
2004 | { | |
2005 | u_int len; | |
2006 | char *command = packet_get_string(&len); | |
e9702f7d | 2007 | packet_check_eom(); |
3c0ef626 | 2008 | do_exec(s, command); |
2009 | xfree(command); | |
2010 | return 1; | |
2011 | } | |
2012 | ||
7cac2b65 | 2013 | static int |
2014 | session_break_req(Session *s) | |
2015 | { | |
2016 | u_int break_length; | |
2017 | ||
2018 | break_length = packet_get_int(); /* ignored */ | |
2019 | packet_check_eom(); | |
2020 | ||
2021 | if (s->ttyfd == -1 || | |
2022 | tcsendbreak(s->ttyfd, 0) < 0) | |
2023 | return 0; | |
2024 | return 1; | |
2025 | } | |
2026 | ||
3c0ef626 | 2027 | static int |
2028 | session_auth_agent_req(Session *s) | |
2029 | { | |
2030 | static int called = 0; | |
e9702f7d | 2031 | packet_check_eom(); |
3c0ef626 | 2032 | if (no_agent_forwarding_flag) { |
2033 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
2034 | return 0; | |
2035 | } | |
2036 | if (called) { | |
2037 | return 0; | |
2038 | } else { | |
2039 | called = 1; | |
2040 | return auth_input_request_forwarding(s->pw); | |
2041 | } | |
2042 | } | |
2043 | ||
e9702f7d | 2044 | int |
2045 | session_input_channel_req(Channel *c, const char *rtype) | |
3c0ef626 | 2046 | { |
3c0ef626 | 2047 | int success = 0; |
3c0ef626 | 2048 | Session *s; |
3c0ef626 | 2049 | |
e9702f7d | 2050 | if ((s = session_by_channel(c->self)) == NULL) { |
7cac2b65 | 2051 | logit("session_input_channel_req: no session %d req %.100s", |
e9702f7d | 2052 | c->self, rtype); |
2053 | return 0; | |
2054 | } | |
2055 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
3c0ef626 | 2056 | |
2057 | /* | |
2058 | * a session is in LARVAL state until a shell, a command | |
2059 | * or a subsystem is executed | |
2060 | */ | |
2061 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2062 | if (strcmp(rtype, "shell") == 0) { | |
2063 | success = session_shell_req(s); | |
2064 | } else if (strcmp(rtype, "exec") == 0) { | |
2065 | success = session_exec_req(s); | |
2066 | } else if (strcmp(rtype, "pty-req") == 0) { | |
2067 | success = session_pty_req(s); | |
2068 | } else if (strcmp(rtype, "x11-req") == 0) { | |
2069 | success = session_x11_req(s); | |
2070 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { | |
2071 | success = session_auth_agent_req(s); | |
2072 | } else if (strcmp(rtype, "subsystem") == 0) { | |
2073 | success = session_subsystem_req(s); | |
7cac2b65 | 2074 | } else if (strcmp(rtype, "break") == 0) { |
2075 | success = session_break_req(s); | |
3c0ef626 | 2076 | } |
2077 | } | |
2078 | if (strcmp(rtype, "window-change") == 0) { | |
2079 | success = session_window_change_req(s); | |
2080 | } | |
e9702f7d | 2081 | return success; |
3c0ef626 | 2082 | } |
2083 | ||
2084 | void | |
2085 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2086 | { | |
2087 | if (!compat20) | |
2088 | fatal("session_set_fds: called for proto != 2.0"); | |
2089 | /* | |
2090 | * now that have a child and a pipe to the child, | |
2091 | * we can activate our channel and register the fd's | |
2092 | */ | |
2093 | if (s->chanid == -1) | |
2094 | fatal("no channel for session %d", s->self); | |
2095 | channel_set_fds(s->chanid, | |
2096 | fdout, fdin, fderr, | |
2097 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
e9702f7d | 2098 | 1, |
2099 | CHAN_SES_WINDOW_DEFAULT); | |
3c0ef626 | 2100 | } |
2101 | ||
2102 | /* | |
2103 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2104 | * (e.g., due to a dropped connection). | |
2105 | */ | |
350391c5 | 2106 | void |
540d72c3 | 2107 | session_pty_cleanup2(Session *s) |
3c0ef626 | 2108 | { |
3c0ef626 | 2109 | if (s == NULL) { |
2110 | error("session_pty_cleanup: no session"); | |
2111 | return; | |
2112 | } | |
2113 | if (s->ttyfd == -1) | |
2114 | return; | |
2115 | ||
2116 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); | |
2117 | ||
2118 | /* Record that the user has logged out. */ | |
2119 | if (s->pid != 0) | |
e9702f7d | 2120 | record_logout(s->pid, s->tty, s->pw->pw_name); |
3c0ef626 | 2121 | |
2122 | /* Release the pseudo-tty. */ | |
350391c5 | 2123 | if (getuid() == 0) |
2124 | pty_release(s->tty); | |
3c0ef626 | 2125 | |
2126 | /* | |
2127 | * Close the server side of the socket pairs. We must do this after | |
2128 | * the pty cleanup, so that another process doesn't get this pty | |
2129 | * while we're still cleaning up. | |
2130 | */ | |
2131 | if (close(s->ptymaster) < 0) | |
350391c5 | 2132 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
3c0ef626 | 2133 | |
2134 | /* unlink pty from session */ | |
2135 | s->ttyfd = -1; | |
2136 | } | |
2137 | ||
350391c5 | 2138 | void |
540d72c3 | 2139 | session_pty_cleanup(Session *s) |
350391c5 | 2140 | { |
540d72c3 | 2141 | PRIVSEP(session_pty_cleanup2(s)); |
350391c5 | 2142 | } |
2143 | ||
d03f4262 | 2144 | static char * |
2145 | sig2name(int sig) | |
2146 | { | |
2147 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2148 | SSH_SIG(ABRT); | |
2149 | SSH_SIG(ALRM); | |
2150 | SSH_SIG(FPE); | |
2151 | SSH_SIG(HUP); | |
2152 | SSH_SIG(ILL); | |
2153 | SSH_SIG(INT); | |
2154 | SSH_SIG(KILL); | |
2155 | SSH_SIG(PIPE); | |
2156 | SSH_SIG(QUIT); | |
2157 | SSH_SIG(SEGV); | |
2158 | SSH_SIG(TERM); | |
2159 | SSH_SIG(USR1); | |
2160 | SSH_SIG(USR2); | |
2161 | #undef SSH_SIG | |
2162 | return "SIG@openssh.com"; | |
2163 | } | |
2164 | ||
3c0ef626 | 2165 | static void |
2166 | session_exit_message(Session *s, int status) | |
2167 | { | |
2168 | Channel *c; | |
e9702f7d | 2169 | |
2170 | if ((c = channel_lookup(s->chanid)) == NULL) | |
3c0ef626 | 2171 | fatal("session_exit_message: session %d: no channel %d", |
2172 | s->self, s->chanid); | |
44a053a3 | 2173 | debug("session_exit_message: session %d channel %d pid %ld", |
2174 | s->self, s->chanid, (long)s->pid); | |
3c0ef626 | 2175 | |
2176 | if (WIFEXITED(status)) { | |
e9702f7d | 2177 | channel_request_start(s->chanid, "exit-status", 0); |
3c0ef626 | 2178 | packet_put_int(WEXITSTATUS(status)); |
2179 | packet_send(); | |
2180 | } else if (WIFSIGNALED(status)) { | |
e9702f7d | 2181 | channel_request_start(s->chanid, "exit-signal", 0); |
d03f4262 | 2182 | packet_put_cstring(sig2name(WTERMSIG(status))); |
3c0ef626 | 2183 | #ifdef WCOREDUMP |
2184 | packet_put_char(WCOREDUMP(status)); | |
2185 | #else /* WCOREDUMP */ | |
2186 | packet_put_char(0); | |
2187 | #endif /* WCOREDUMP */ | |
2188 | packet_put_cstring(""); | |
2189 | packet_put_cstring(""); | |
2190 | packet_send(); | |
2191 | } else { | |
2192 | /* Some weird exit cause. Just exit. */ | |
2193 | packet_disconnect("wait returned status %04x.", status); | |
2194 | } | |
2195 | ||
2196 | /* disconnect channel */ | |
2197 | debug("session_exit_message: release channel %d", s->chanid); | |
2198 | channel_cancel_cleanup(s->chanid); | |
2199 | /* | |
2200 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2201 | * interested in data we write. | |
2202 | * Note that we must not call 'chan_read_failed', since there could | |
2203 | * be some more data waiting in the pipe. | |
2204 | */ | |
2205 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2206 | chan_write_failed(c); | |
2207 | s->chanid = -1; | |
2208 | } | |
2209 | ||
350391c5 | 2210 | void |
3c0ef626 | 2211 | session_close(Session *s) |
2212 | { | |
44a053a3 | 2213 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
540d72c3 | 2214 | if (s->ttyfd != -1) |
3c0ef626 | 2215 | session_pty_cleanup(s); |
3c0ef626 | 2216 | if (s->term) |
2217 | xfree(s->term); | |
2218 | if (s->display) | |
2219 | xfree(s->display); | |
e9702f7d | 2220 | if (s->auth_display) |
2221 | xfree(s->auth_display); | |
3c0ef626 | 2222 | if (s->auth_data) |
2223 | xfree(s->auth_data); | |
2224 | if (s->auth_proto) | |
2225 | xfree(s->auth_proto); | |
2226 | s->used = 0; | |
2227 | session_proctitle(s); | |
2228 | } | |
2229 | ||
2230 | void | |
2231 | session_close_by_pid(pid_t pid, int status) | |
2232 | { | |
2233 | Session *s = session_by_pid(pid); | |
2234 | if (s == NULL) { | |
44a053a3 | 2235 | debug("session_close_by_pid: no session for pid %ld", |
2236 | (long)pid); | |
3c0ef626 | 2237 | return; |
2238 | } | |
2239 | if (s->chanid != -1) | |
2240 | session_exit_message(s, status); | |
2241 | session_close(s); | |
2242 | } | |
2243 | ||
2244 | /* | |
2245 | * this is called when a channel dies before | |
2246 | * the session 'child' itself dies | |
2247 | */ | |
2248 | void | |
2249 | session_close_by_channel(int id, void *arg) | |
2250 | { | |
2251 | Session *s = session_by_channel(id); | |
2252 | if (s == NULL) { | |
2253 | debug("session_close_by_channel: no session for id %d", id); | |
2254 | return; | |
2255 | } | |
44a053a3 | 2256 | debug("session_close_by_channel: channel %d child %ld", |
2257 | id, (long)s->pid); | |
3c0ef626 | 2258 | if (s->pid != 0) { |
2259 | debug("session_close_by_channel: channel %d: has child", id); | |
2260 | /* | |
2261 | * delay detach of session, but release pty, since | |
2262 | * the fd's to the child are already closed | |
2263 | */ | |
540d72c3 | 2264 | if (s->ttyfd != -1) |
3c0ef626 | 2265 | session_pty_cleanup(s); |
3c0ef626 | 2266 | return; |
2267 | } | |
2268 | /* detach by removing callback */ | |
2269 | channel_cancel_cleanup(s->chanid); | |
2270 | s->chanid = -1; | |
2271 | session_close(s); | |
2272 | } | |
2273 | ||
2274 | void | |
350391c5 | 2275 | session_destroy_all(void (*closefunc)(Session *)) |
3c0ef626 | 2276 | { |
2277 | int i; | |
e9702f7d | 2278 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2279 | Session *s = &sessions[i]; |
350391c5 | 2280 | if (s->used) { |
2281 | if (closefunc != NULL) | |
2282 | closefunc(s); | |
2283 | else | |
2284 | session_close(s); | |
2285 | } | |
3c0ef626 | 2286 | } |
2287 | } | |
2288 | ||
2289 | static char * | |
2290 | session_tty_list(void) | |
2291 | { | |
2292 | static char buf[1024]; | |
2293 | int i; | |
bfe49944 | 2294 | char *cp; |
2295 | ||
3c0ef626 | 2296 | buf[0] = '\0'; |
e9702f7d | 2297 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2298 | Session *s = &sessions[i]; |
2299 | if (s->used && s->ttyfd != -1) { | |
540d72c3 | 2300 | |
bfe49944 | 2301 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2302 | cp = strrchr(s->tty, '/'); | |
2303 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2304 | } else | |
2305 | cp = s->tty + 5; | |
540d72c3 | 2306 | |
3c0ef626 | 2307 | if (buf[0] != '\0') |
2308 | strlcat(buf, ",", sizeof buf); | |
bfe49944 | 2309 | strlcat(buf, cp, sizeof buf); |
3c0ef626 | 2310 | } |
2311 | } | |
2312 | if (buf[0] == '\0') | |
2313 | strlcpy(buf, "notty", sizeof buf); | |
2314 | return buf; | |
2315 | } | |
2316 | ||
2317 | void | |
2318 | session_proctitle(Session *s) | |
2319 | { | |
2320 | if (s->pw == NULL) | |
2321 | error("no user for session %d", s->self); | |
2322 | else | |
2323 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2324 | } | |
2325 | ||
2326 | int | |
2327 | session_setup_x11fwd(Session *s) | |
2328 | { | |
2329 | struct stat st; | |
e9702f7d | 2330 | char display[512], auth_display[512]; |
2331 | char hostname[MAXHOSTNAMELEN]; | |
3c0ef626 | 2332 | |
2333 | if (no_x11_forwarding_flag) { | |
2334 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2335 | return 0; | |
2336 | } | |
2337 | if (!options.x11_forwarding) { | |
2338 | debug("X11 forwarding disabled in server configuration file."); | |
2339 | return 0; | |
2340 | } | |
2341 | if (!options.xauth_location || | |
2342 | (stat(options.xauth_location, &st) == -1)) { | |
2343 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2344 | return 0; | |
2345 | } | |
2346 | if (options.use_login) { | |
2347 | packet_send_debug("X11 forwarding disabled; " | |
2348 | "not compatible with UseLogin=yes."); | |
2349 | return 0; | |
2350 | } | |
2351 | if (s->display != NULL) { | |
2352 | debug("X11 display already set."); | |
2353 | return 0; | |
2354 | } | |
276b07a3 | 2355 | if (x11_create_display_inet(options.x11_display_offset, |
2356 | options.x11_use_localhost, s->single_connection, | |
2357 | &s->display_number) == -1) { | |
3c0ef626 | 2358 | debug("x11_create_display_inet failed."); |
2359 | return 0; | |
2360 | } | |
e9702f7d | 2361 | |
2362 | /* Set up a suitable value for the DISPLAY variable. */ | |
2363 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2364 | fatal("gethostname: %.100s", strerror(errno)); | |
2365 | /* | |
2366 | * auth_display must be used as the displayname when the | |
2367 | * authorization entry is added with xauth(1). This will be | |
2368 | * different than the DISPLAY string for localhost displays. | |
2369 | */ | |
2370 | if (options.x11_use_localhost) { | |
276b07a3 | 2371 | snprintf(display, sizeof display, "localhost:%u.%u", |
e9702f7d | 2372 | s->display_number, s->screen); |
276b07a3 | 2373 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
e9702f7d | 2374 | s->display_number, s->screen); |
2375 | s->display = xstrdup(display); | |
2376 | s->auth_display = xstrdup(auth_display); | |
2377 | } else { | |
2378 | #ifdef IPADDR_IN_DISPLAY | |
2379 | struct hostent *he; | |
2380 | struct in_addr my_addr; | |
2381 | ||
2382 | he = gethostbyname(hostname); | |
2383 | if (he == NULL) { | |
2384 | error("Can't get IP address for X11 DISPLAY."); | |
2385 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2386 | return 0; | |
2387 | } | |
2388 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
276b07a3 | 2389 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
e9702f7d | 2390 | s->display_number, s->screen); |
2391 | #else | |
276b07a3 | 2392 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
e9702f7d | 2393 | s->display_number, s->screen); |
2394 | #endif | |
2395 | s->display = xstrdup(display); | |
2396 | s->auth_display = xstrdup(display); | |
2397 | } | |
2398 | ||
3c0ef626 | 2399 | return 1; |
2400 | } | |
2401 | ||
2402 | static void | |
2403 | do_authenticated2(Authctxt *authctxt) | |
2404 | { | |
2405 | server_loop2(authctxt); | |
540d72c3 | 2406 | } |
2407 | ||
2408 | void | |
2409 | do_cleanup(Authctxt *authctxt) | |
2410 | { | |
2411 | static int called = 0; | |
2412 | ||
2413 | debug("do_cleanup"); | |
2414 | ||
2415 | /* no cleanup if we're in the child for login shell */ | |
2416 | if (is_child) | |
2417 | return; | |
2418 | ||
2419 | /* avoid double cleanup */ | |
2420 | if (called) | |
2421 | return; | |
2422 | called = 1; | |
2423 | ||
2424 | if (authctxt == NULL) | |
2425 | return; | |
2426 | #ifdef KRB5 | |
2427 | if (options.kerberos_ticket_cleanup && | |
2428 | authctxt->krb5_ctx) | |
2429 | krb5_cleanup_proc(authctxt); | |
5598e598 | 2430 | #endif |
540d72c3 | 2431 | |
2432 | #ifdef GSSAPI | |
2433 | if (compat20 && options.gss_cleanup_creds) | |
2434 | ssh_gssapi_cleanup_creds(); | |
2435 | #endif | |
2436 | ||
2437 | #ifdef USE_PAM | |
2438 | if (options.use_pam) { | |
2439 | sshpam_cleanup(); | |
2440 | sshpam_thread_cleanup(); | |
2441 | } | |
2442 | #endif | |
2443 | ||
2444 | /* remove agent socket */ | |
2445 | auth_sock_cleanup_proc(authctxt->pw); | |
2446 | ||
2447 | /* | |
2448 | * Cleanup ptys/utmp only if privsep is disabled, | |
2449 | * or if running in monitor. | |
2450 | */ | |
2451 | if (!use_privsep || mm_is_monitor()) | |
2452 | session_destroy_all(session_pty_cleanup2); | |
3c0ef626 | 2453 | } |