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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" | |
29d88157 | 36 | RCSID("$OpenBSD: session.c,v 1.164 2003/09/18 08:49:45 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 | |
5598e598 | 61 | #ifdef GSSAPI |
62 | #include "ssh-gss.h" | |
63 | #endif | |
64 | ||
3c0ef626 | 65 | /* func */ |
66 | ||
67 | Session *session_new(void); | |
68 | void session_set_fds(Session *, int, int, int); | |
350391c5 | 69 | void session_pty_cleanup(void *); |
3c0ef626 | 70 | void session_proctitle(Session *); |
71 | int session_setup_x11fwd(Session *); | |
72 | void do_exec_pty(Session *, const char *); | |
73 | void do_exec_no_pty(Session *, const char *); | |
74 | void do_exec(Session *, const char *); | |
75 | void do_login(Session *, const char *); | |
76 | #ifdef LOGIN_NEEDS_UTMPX | |
77 | static void do_pre_login(Session *s); | |
78 | #endif | |
79 | void do_child(Session *, const char *); | |
80 | void do_motd(void); | |
81 | int check_quietlogin(Session *, const char *); | |
82 | ||
83 | static void do_authenticated1(Authctxt *); | |
84 | static void do_authenticated2(Authctxt *); | |
85 | ||
3c0ef626 | 86 | static int session_pty_req(Session *); |
87 | ||
75be3237 | 88 | #ifdef SESSION_HOOKS |
89 | static void execute_session_hook(char* prog, Authctxt *authctxt, | |
90 | int startup, int save); | |
91 | #endif | |
92 | ||
3c0ef626 | 93 | /* import */ |
94 | extern ServerOptions options; | |
95 | extern char *__progname; | |
96 | extern int log_stderr; | |
97 | extern int debug_flag; | |
98 | extern u_int utmp_len; | |
99 | extern int startup_pipe; | |
100 | extern void destroy_sensitive_data(void); | |
7cac2b65 | 101 | extern Buffer loginmsg; |
3c0ef626 | 102 | |
103 | /* original command from peer. */ | |
104 | const char *original_command = NULL; | |
105 | ||
106 | /* data */ | |
107 | #define MAX_SESSIONS 10 | |
108 | Session sessions[MAX_SESSIONS]; | |
109 | ||
3c0ef626 | 110 | #ifdef HAVE_LOGIN_CAP |
350391c5 | 111 | login_cap_t *lc; |
3c0ef626 | 112 | #endif |
113 | ||
44a053a3 | 114 | /* Name and directory of socket for authentication agent forwarding. */ |
115 | static char *auth_sock_name = NULL; | |
116 | static char *auth_sock_dir = NULL; | |
117 | ||
118 | /* removes the agent forwarding socket */ | |
119 | ||
120 | static void | |
121 | auth_sock_cleanup_proc(void *_pw) | |
122 | { | |
123 | struct passwd *pw = _pw; | |
124 | ||
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); | |
152 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
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 | } | |
165 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", | |
166 | auth_sock_dir, (long) getpid()); | |
167 | ||
168 | /* delete agent socket on fatal() */ | |
169 | fatal_add_cleanup(auth_sock_cleanup_proc, pw); | |
170 | ||
171 | /* Create the socket. */ | |
172 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
173 | if (sock < 0) | |
174 | packet_disconnect("socket: %.100s", strerror(errno)); | |
175 | ||
176 | /* Bind it to the name. */ | |
177 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
178 | sunaddr.sun_family = AF_UNIX; | |
179 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
180 | ||
181 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
182 | packet_disconnect("bind: %.100s", strerror(errno)); | |
183 | ||
184 | /* Restore the privileged uid. */ | |
185 | restore_uid(); | |
186 | ||
187 | /* Start listening on the socket. */ | |
188 | if (listen(sock, 5) < 0) | |
189 | packet_disconnect("listen: %.100s", strerror(errno)); | |
190 | ||
191 | /* Allocate a channel for the authentication agent socket. */ | |
192 | nc = channel_new("auth socket", | |
193 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
194 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
7cac2b65 | 195 | 0, "auth socket", 1); |
44a053a3 | 196 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
197 | return 1; | |
198 | } | |
199 | ||
200 | ||
3c0ef626 | 201 | void |
202 | do_authenticated(Authctxt *authctxt) | |
203 | { | |
bfe49944 | 204 | setproctitle("%s", authctxt->pw->pw_name); |
205 | ||
3c0ef626 | 206 | /* |
207 | * Cancel the alarm we set to limit the time taken for | |
208 | * authentication. | |
209 | */ | |
210 | alarm(0); | |
211 | if (startup_pipe != -1) { | |
212 | close(startup_pipe); | |
213 | startup_pipe = -1; | |
214 | } | |
3c0ef626 | 215 | |
216 | /* setup the channel layer */ | |
217 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
218 | channel_permit_all_opens(); | |
219 | ||
220 | if (compat20) | |
221 | do_authenticated2(authctxt); | |
222 | else | |
223 | do_authenticated1(authctxt); | |
224 | ||
225 | /* remove agent socket */ | |
44a053a3 | 226 | if (auth_sock_name != NULL) |
3c0ef626 | 227 | auth_sock_cleanup_proc(authctxt->pw); |
75be3237 | 228 | #ifdef SESSION_HOOKS |
229 | if (options.session_hooks_allow && | |
230 | options.session_hooks_shutdown_cmd) | |
231 | { | |
232 | execute_session_hook(options.session_hooks_shutdown_cmd, | |
233 | authctxt, | |
234 | /* startup = */ 0, /* save = */ 0); | |
235 | ||
236 | if (authctxt->session_env_file) | |
237 | { | |
238 | free(authctxt->session_env_file); | |
239 | } | |
240 | } | |
241 | #endif | |
3c0ef626 | 242 | #ifdef KRB5 |
243 | if (options.kerberos_ticket_cleanup) | |
244 | krb5_cleanup_proc(authctxt); | |
245 | #endif | |
246 | } | |
247 | ||
248 | /* | |
249 | * Prepares for an interactive session. This is called after the user has | |
250 | * been successfully authenticated. During this message exchange, pseudo | |
251 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
252 | * are requested, etc. | |
253 | */ | |
254 | static void | |
255 | do_authenticated1(Authctxt *authctxt) | |
256 | { | |
257 | Session *s; | |
258 | char *command; | |
e9702f7d | 259 | int success, type, screen_flag; |
276b07a3 | 260 | int enable_compression_after_reply = 0; |
261 | u_int proto_len, data_len, dlen, compression_level = 0; | |
3c0ef626 | 262 | |
263 | s = session_new(); | |
264 | s->authctxt = authctxt; | |
265 | s->pw = authctxt->pw; | |
266 | ||
267 | /* | |
268 | * We stay in this loop until the client requests to execute a shell | |
269 | * or a command. | |
270 | */ | |
271 | for (;;) { | |
272 | success = 0; | |
273 | ||
274 | /* Get a packet from the client. */ | |
e9702f7d | 275 | type = packet_read(); |
3c0ef626 | 276 | |
277 | /* Process the packet. */ | |
278 | switch (type) { | |
279 | case SSH_CMSG_REQUEST_COMPRESSION: | |
3c0ef626 | 280 | compression_level = packet_get_int(); |
e9702f7d | 281 | packet_check_eom(); |
3c0ef626 | 282 | if (compression_level < 1 || compression_level > 9) { |
283 | packet_send_debug("Received illegal compression level %d.", | |
e9702f7d | 284 | compression_level); |
3c0ef626 | 285 | break; |
286 | } | |
44a053a3 | 287 | if (!options.compression) { |
288 | debug2("compression disabled"); | |
289 | break; | |
290 | } | |
3c0ef626 | 291 | /* Enable compression after we have responded with SUCCESS. */ |
292 | enable_compression_after_reply = 1; | |
293 | success = 1; | |
294 | break; | |
295 | ||
296 | case SSH_CMSG_REQUEST_PTY: | |
297 | success = session_pty_req(s); | |
298 | break; | |
299 | ||
300 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
301 | s->auth_proto = packet_get_string(&proto_len); | |
302 | s->auth_data = packet_get_string(&data_len); | |
303 | ||
304 | screen_flag = packet_get_protocol_flags() & | |
305 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
306 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
307 | ||
308 | if (packet_remaining() == 4) { | |
309 | if (!screen_flag) | |
310 | debug2("Buggy client: " | |
311 | "X11 screen flag missing"); | |
312 | s->screen = packet_get_int(); | |
313 | } else { | |
314 | s->screen = 0; | |
315 | } | |
e9702f7d | 316 | packet_check_eom(); |
3c0ef626 | 317 | success = session_setup_x11fwd(s); |
318 | if (!success) { | |
319 | xfree(s->auth_proto); | |
320 | xfree(s->auth_data); | |
321 | s->auth_proto = NULL; | |
322 | s->auth_data = NULL; | |
323 | } | |
324 | break; | |
325 | ||
326 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
327 | if (no_agent_forwarding_flag || compat13) { | |
328 | debug("Authentication agent forwarding not permitted for this authentication."); | |
329 | break; | |
330 | } | |
331 | debug("Received authentication agent forwarding request."); | |
332 | success = auth_input_request_forwarding(s->pw); | |
333 | break; | |
334 | ||
335 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
336 | if (no_port_forwarding_flag) { | |
337 | debug("Port forwarding not permitted for this authentication."); | |
338 | break; | |
339 | } | |
340 | if (!options.allow_tcp_forwarding) { | |
341 | debug("Port forwarding not permitted."); | |
342 | break; | |
343 | } | |
344 | debug("Received TCP/IP port forwarding request."); | |
345 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); | |
346 | success = 1; | |
347 | break; | |
348 | ||
349 | case SSH_CMSG_MAX_PACKET_SIZE: | |
350 | if (packet_set_maxsize(packet_get_int()) > 0) | |
351 | success = 1; | |
352 | break; | |
e9702f7d | 353 | |
3c0ef626 | 354 | case SSH_CMSG_EXEC_SHELL: |
355 | case SSH_CMSG_EXEC_CMD: | |
356 | if (type == SSH_CMSG_EXEC_CMD) { | |
357 | command = packet_get_string(&dlen); | |
358 | debug("Exec command '%.500s'", command); | |
359 | do_exec(s, command); | |
360 | xfree(command); | |
361 | } else { | |
362 | do_exec(s, NULL); | |
363 | } | |
e9702f7d | 364 | packet_check_eom(); |
3c0ef626 | 365 | session_close(s); |
7cac2b65 | 366 | #if defined(GSSAPI) |
367 | if (options.gss_cleanup_creds) | |
368 | ssh_gssapi_cleanup_creds(NULL); | |
369 | #endif | |
3c0ef626 | 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) | |
7cac2b65 | 421 | if (options.use_pam) { |
422 | do_pam_setcred(1); | |
423 | if (is_pam_password_change_required()) | |
424 | packet_disconnect("Password change required but no " | |
425 | "TTY available"); | |
426 | } | |
3c0ef626 | 427 | #endif /* USE_PAM */ |
428 | ||
429 | /* Fork the child. */ | |
430 | if ((pid = fork()) == 0) { | |
d03f4262 | 431 | fatal_remove_all_cleanups(); |
432 | ||
3c0ef626 | 433 | /* Child. Reinitialize the log since the pid has changed. */ |
434 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
435 | ||
436 | /* | |
437 | * Create a new session and process group since the 4.4BSD | |
438 | * setlogin() affects the entire process group. | |
439 | */ | |
440 | if (setsid() < 0) | |
441 | error("setsid failed: %.100s", strerror(errno)); | |
442 | ||
443 | #ifdef USE_PIPES | |
444 | /* | |
445 | * Redirect stdin. We close the parent side of the socket | |
446 | * pair, and make the child side the standard input. | |
447 | */ | |
448 | close(pin[1]); | |
449 | if (dup2(pin[0], 0) < 0) | |
450 | perror("dup2 stdin"); | |
451 | close(pin[0]); | |
452 | ||
453 | /* Redirect stdout. */ | |
454 | close(pout[0]); | |
455 | if (dup2(pout[1], 1) < 0) | |
456 | perror("dup2 stdout"); | |
457 | close(pout[1]); | |
458 | ||
459 | /* Redirect stderr. */ | |
460 | close(perr[0]); | |
461 | if (dup2(perr[1], 2) < 0) | |
462 | perror("dup2 stderr"); | |
463 | close(perr[1]); | |
464 | #else /* USE_PIPES */ | |
465 | /* | |
466 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
467 | * use the same socket, as some programs (particularly rdist) | |
468 | * seem to depend on it. | |
469 | */ | |
470 | close(inout[1]); | |
471 | close(err[1]); | |
472 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
473 | perror("dup2 stdin"); | |
474 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
475 | perror("dup2 stdout"); | |
476 | if (dup2(err[0], 2) < 0) /* stderr */ | |
477 | perror("dup2 stderr"); | |
478 | #endif /* USE_PIPES */ | |
479 | ||
d03f4262 | 480 | #ifdef _UNICOS |
481 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
482 | #endif | |
483 | ||
3c0ef626 | 484 | /* Do processing for the child (exec command etc). */ |
485 | do_child(s, command); | |
486 | /* NOTREACHED */ | |
487 | } | |
d03f4262 | 488 | #ifdef _UNICOS |
489 | signal(WJSIGNAL, cray_job_termination_handler); | |
490 | #endif /* _UNICOS */ | |
3c0ef626 | 491 | #ifdef HAVE_CYGWIN |
492 | if (is_winnt) | |
493 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
494 | #endif | |
495 | if (pid < 0) | |
496 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
497 | s->pid = pid; | |
498 | /* Set interactive/non-interactive mode. */ | |
499 | packet_set_interactive(s->display != NULL); | |
500 | #ifdef USE_PIPES | |
501 | /* We are the parent. Close the child sides of the pipes. */ | |
502 | close(pin[0]); | |
503 | close(pout[1]); | |
504 | close(perr[1]); | |
505 | ||
506 | if (compat20) { | |
507 | session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); | |
508 | } else { | |
509 | /* Enter the interactive session. */ | |
510 | server_loop(pid, pin[1], pout[0], perr[0]); | |
511 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ | |
512 | } | |
513 | #else /* USE_PIPES */ | |
514 | /* We are the parent. Close the child sides of the socket pairs. */ | |
515 | close(inout[0]); | |
516 | close(err[0]); | |
517 | ||
518 | /* | |
519 | * Enter the interactive session. Note: server_loop must be able to | |
520 | * handle the case that fdin and fdout are the same. | |
521 | */ | |
522 | if (compat20) { | |
523 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); | |
524 | } else { | |
525 | server_loop(pid, inout[1], inout[1], err[1]); | |
526 | /* server_loop has closed inout[1] and err[1]. */ | |
527 | } | |
528 | #endif /* USE_PIPES */ | |
529 | } | |
530 | ||
531 | /* | |
532 | * This is called to fork and execute a command when we have a tty. This | |
533 | * will call do_child from the child, and server_loop from the parent after | |
534 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
535 | * lastlog, and other such operations. | |
536 | */ | |
537 | void | |
538 | do_exec_pty(Session *s, const char *command) | |
539 | { | |
540 | int fdout, ptyfd, ttyfd, ptymaster; | |
541 | pid_t pid; | |
542 | ||
543 | if (s == NULL) | |
544 | fatal("do_exec_pty: no session"); | |
545 | ptyfd = s->ptyfd; | |
546 | ttyfd = s->ttyfd; | |
547 | ||
548 | #if defined(USE_PAM) | |
7cac2b65 | 549 | if (options.use_pam) { |
550 | do_pam_set_tty(s->tty); | |
551 | do_pam_setcred(1); | |
552 | } | |
3c0ef626 | 553 | #endif |
554 | ||
555 | /* Fork the child. */ | |
556 | if ((pid = fork()) == 0) { | |
d03f4262 | 557 | fatal_remove_all_cleanups(); |
3c0ef626 | 558 | |
559 | /* Child. Reinitialize the log because the pid has changed. */ | |
560 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
561 | /* Close the master side of the pseudo tty. */ | |
562 | close(ptyfd); | |
563 | ||
564 | /* Make the pseudo tty our controlling tty. */ | |
565 | pty_make_controlling_tty(&ttyfd, s->tty); | |
566 | ||
567 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ | |
568 | if (dup2(ttyfd, 0) < 0) | |
569 | error("dup2 stdin: %s", strerror(errno)); | |
570 | if (dup2(ttyfd, 1) < 0) | |
571 | error("dup2 stdout: %s", strerror(errno)); | |
572 | if (dup2(ttyfd, 2) < 0) | |
573 | error("dup2 stderr: %s", strerror(errno)); | |
574 | ||
575 | /* Close the extra descriptor for the pseudo tty. */ | |
576 | close(ttyfd); | |
577 | ||
578 | /* record login, etc. similar to login(1) */ | |
579 | #ifndef HAVE_OSF_SIA | |
d03f4262 | 580 | if (!(options.use_login && command == NULL)) { |
581 | #ifdef _UNICOS | |
582 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
583 | #endif /* _UNICOS */ | |
3c0ef626 | 584 | do_login(s, command); |
d03f4262 | 585 | } |
3c0ef626 | 586 | # ifdef LOGIN_NEEDS_UTMPX |
587 | else | |
588 | do_pre_login(s); | |
589 | # endif | |
590 | #endif | |
591 | ||
592 | /* Do common processing for the child, such as execing the command. */ | |
593 | do_child(s, command); | |
594 | /* NOTREACHED */ | |
595 | } | |
d03f4262 | 596 | #ifdef _UNICOS |
597 | signal(WJSIGNAL, cray_job_termination_handler); | |
598 | #endif /* _UNICOS */ | |
3c0ef626 | 599 | #ifdef HAVE_CYGWIN |
600 | if (is_winnt) | |
601 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
602 | #endif | |
603 | if (pid < 0) | |
604 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
605 | s->pid = pid; | |
606 | ||
607 | /* Parent. Close the slave side of the pseudo tty. */ | |
608 | close(ttyfd); | |
609 | ||
610 | /* | |
611 | * Create another descriptor of the pty master side for use as the | |
612 | * standard input. We could use the original descriptor, but this | |
613 | * simplifies code in server_loop. The descriptor is bidirectional. | |
614 | */ | |
615 | fdout = dup(ptyfd); | |
616 | if (fdout < 0) | |
617 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
618 | ||
619 | /* we keep a reference to the pty master */ | |
620 | ptymaster = dup(ptyfd); | |
621 | if (ptymaster < 0) | |
622 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
623 | s->ptymaster = ptymaster; | |
624 | ||
625 | /* Enter interactive session. */ | |
626 | packet_set_interactive(1); | |
627 | if (compat20) { | |
628 | session_set_fds(s, ptyfd, fdout, -1); | |
629 | } else { | |
630 | server_loop(pid, ptyfd, fdout, -1); | |
631 | /* server_loop _has_ closed ptyfd and fdout. */ | |
632 | } | |
633 | } | |
634 | ||
635 | #ifdef LOGIN_NEEDS_UTMPX | |
636 | static void | |
637 | do_pre_login(Session *s) | |
638 | { | |
639 | socklen_t fromlen; | |
640 | struct sockaddr_storage from; | |
641 | pid_t pid = getpid(); | |
642 | ||
643 | /* | |
644 | * Get IP address of client. If the connection is not a socket, let | |
645 | * the address be 0.0.0.0. | |
646 | */ | |
647 | memset(&from, 0, sizeof(from)); | |
d03f4262 | 648 | fromlen = sizeof(from); |
3c0ef626 | 649 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 650 | if (getpeername(packet_get_connection_in(), |
e9702f7d | 651 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 652 | debug("getpeername: %.100s", strerror(errno)); |
653 | fatal_cleanup(); | |
654 | } | |
655 | } | |
656 | ||
657 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
7cac2b65 | 658 | get_remote_name_or_ip(utmp_len, options.use_dns), |
bfe49944 | 659 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 660 | } |
661 | #endif | |
662 | ||
663 | /* | |
664 | * This is called to fork and execute a command. If another command is | |
665 | * to be forced, execute that instead. | |
666 | */ | |
667 | void | |
668 | do_exec(Session *s, const char *command) | |
669 | { | |
670 | if (forced_command) { | |
671 | original_command = command; | |
672 | command = forced_command; | |
673 | debug("Forced command '%.900s'", command); | |
674 | } | |
675 | ||
7cac2b65 | 676 | #if defined(SESSION_HOOKS) |
677 | if (options.session_hooks_allow && | |
678 | (options.session_hooks_startup_cmd || | |
679 | options.session_hooks_shutdown_cmd)) | |
680 | { | |
681 | char env_file[1000]; | |
682 | struct stat st; | |
683 | do | |
684 | { | |
685 | snprintf(env_file, | |
686 | sizeof(env_file), | |
687 | "/tmp/ssh_env_%d%d%d", | |
688 | getuid(), | |
689 | getpid(), | |
690 | rand()); | |
691 | } while (stat(env_file, &st)==0); | |
692 | s->authctxt->session_env_file = strdup(env_file); | |
693 | } | |
694 | #endif | |
695 | ||
696 | #ifdef GSSAPI | |
697 | if (options.gss_authentication) { | |
698 | temporarily_use_uid(s->pw); | |
699 | ssh_gssapi_storecreds(); | |
700 | restore_uid(); | |
701 | } | |
702 | #endif | |
703 | ||
3c0ef626 | 704 | if (s->ttyfd != -1) |
705 | do_exec_pty(s, command); | |
706 | else | |
707 | do_exec_no_pty(s, command); | |
708 | ||
709 | original_command = NULL; | |
710 | } | |
711 | ||
e9702f7d | 712 | |
3c0ef626 | 713 | /* administrative, login(1)-like work */ |
714 | void | |
715 | do_login(Session *s, const char *command) | |
716 | { | |
717 | char *time_string; | |
3c0ef626 | 718 | socklen_t fromlen; |
719 | struct sockaddr_storage from; | |
3c0ef626 | 720 | struct passwd * pw = s->pw; |
721 | pid_t pid = getpid(); | |
722 | ||
723 | /* | |
724 | * Get IP address of client. If the connection is not a socket, let | |
725 | * the address be 0.0.0.0. | |
726 | */ | |
727 | memset(&from, 0, sizeof(from)); | |
bfe49944 | 728 | fromlen = sizeof(from); |
3c0ef626 | 729 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 730 | if (getpeername(packet_get_connection_in(), |
e9702f7d | 731 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 732 | debug("getpeername: %.100s", strerror(errno)); |
733 | fatal_cleanup(); | |
734 | } | |
735 | } | |
736 | ||
3c0ef626 | 737 | /* Record that there was a login on that tty from the remote host. */ |
350391c5 | 738 | if (!use_privsep) |
739 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
740 | get_remote_name_or_ip(utmp_len, | |
7cac2b65 | 741 | options.use_dns), |
d03f4262 | 742 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 743 | |
744 | #ifdef USE_PAM | |
745 | /* | |
746 | * If password change is needed, do it now. | |
747 | * This needs to occur before the ~/.hushlogin check. | |
748 | */ | |
7cac2b65 | 749 | if (options.use_pam && is_pam_password_change_required()) { |
3c0ef626 | 750 | print_pam_messages(); |
751 | do_pam_chauthtok(); | |
7cac2b65 | 752 | /* XXX - signal [net] parent to enable forwardings */ |
3c0ef626 | 753 | } |
754 | #endif | |
755 | ||
756 | if (check_quietlogin(s, command)) | |
757 | return; | |
758 | ||
759 | #ifdef USE_PAM | |
7cac2b65 | 760 | if (options.use_pam && !is_pam_password_change_required()) |
3c0ef626 | 761 | print_pam_messages(); |
762 | #endif /* USE_PAM */ | |
7cac2b65 | 763 | |
764 | /* display post-login message */ | |
765 | if (buffer_len(&loginmsg) > 0) { | |
766 | buffer_append(&loginmsg, "\0", 1); | |
767 | printf("%s\n", (char *)buffer_ptr(&loginmsg)); | |
768 | } | |
769 | buffer_free(&loginmsg); | |
3c0ef626 | 770 | |
d03f4262 | 771 | #ifndef NO_SSH_LASTLOG |
350391c5 | 772 | if (options.print_lastlog && s->last_login_time != 0) { |
773 | time_string = ctime(&s->last_login_time); | |
3c0ef626 | 774 | if (strchr(time_string, '\n')) |
775 | *strchr(time_string, '\n') = 0; | |
350391c5 | 776 | if (strcmp(s->hostname, "") == 0) |
3c0ef626 | 777 | printf("Last login: %s\r\n", time_string); |
778 | else | |
350391c5 | 779 | printf("Last login: %s from %s\r\n", time_string, |
780 | s->hostname); | |
3c0ef626 | 781 | } |
d03f4262 | 782 | #endif /* NO_SSH_LASTLOG */ |
3c0ef626 | 783 | |
784 | do_motd(); | |
785 | } | |
786 | ||
787 | /* | |
788 | * Display the message of the day. | |
789 | */ | |
790 | void | |
791 | do_motd(void) | |
792 | { | |
793 | FILE *f; | |
794 | char buf[256]; | |
795 | ||
796 | if (options.print_motd) { | |
797 | #ifdef HAVE_LOGIN_CAP | |
798 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
799 | "/etc/motd"), "r"); | |
800 | #else | |
801 | f = fopen("/etc/motd", "r"); | |
802 | #endif | |
803 | if (f) { | |
804 | while (fgets(buf, sizeof(buf), f)) | |
805 | fputs(buf, stdout); | |
806 | fclose(f); | |
807 | } | |
808 | } | |
809 | } | |
810 | ||
811 | ||
812 | /* | |
813 | * Check for quiet login, either .hushlogin or command given. | |
814 | */ | |
815 | int | |
816 | check_quietlogin(Session *s, const char *command) | |
817 | { | |
818 | char buf[256]; | |
819 | struct passwd *pw = s->pw; | |
820 | struct stat st; | |
821 | ||
822 | /* Return 1 if .hushlogin exists or a command given. */ | |
823 | if (command != NULL) | |
824 | return 1; | |
825 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
826 | #ifdef HAVE_LOGIN_CAP | |
827 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
828 | return 1; | |
829 | #else | |
830 | if (stat(buf, &st) >= 0) | |
831 | return 1; | |
832 | #endif | |
833 | return 0; | |
834 | } | |
835 | ||
836 | /* | |
837 | * Sets the value of the given variable in the environment. If the variable | |
838 | * already exists, its value is overriden. | |
839 | */ | |
5598e598 | 840 | void |
3c0ef626 | 841 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
e9702f7d | 842 | const char *value) |
3c0ef626 | 843 | { |
3c0ef626 | 844 | char **env; |
29d88157 | 845 | u_int envsize; |
846 | u_int i, namelen; | |
3c0ef626 | 847 | |
7cac2b65 | 848 | /* |
849 | * If we're passed an uninitialized list, allocate a single null | |
850 | * entry before continuing. | |
851 | */ | |
852 | if (*envp == NULL && *envsizep == 0) { | |
853 | *envp = xmalloc(sizeof(char *)); | |
854 | *envp[0] = NULL; | |
855 | *envsizep = 1; | |
856 | } | |
857 | ||
3c0ef626 | 858 | /* |
859 | * Find the slot where the value should be stored. If the variable | |
860 | * already exists, we reuse the slot; otherwise we append a new slot | |
861 | * at the end of the array, expanding if necessary. | |
862 | */ | |
863 | env = *envp; | |
864 | namelen = strlen(name); | |
865 | for (i = 0; env[i]; i++) | |
866 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
867 | break; | |
868 | if (env[i]) { | |
869 | /* Reuse the slot. */ | |
870 | xfree(env[i]); | |
871 | } else { | |
872 | /* New variable. Expand if necessary. */ | |
29d88157 | 873 | envsize = *envsizep; |
874 | if (i >= envsize - 1) { | |
875 | if (envsize >= 1000) | |
876 | fatal("child_set_env: too many env vars"); | |
877 | envsize += 50; | |
878 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); | |
879 | *envsizep = envsize; | |
3c0ef626 | 880 | } |
881 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
882 | env[i + 1] = NULL; | |
883 | } | |
884 | ||
885 | /* Allocate space and format the variable in the appropriate slot. */ | |
886 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
887 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
888 | } | |
889 | ||
890 | /* | |
891 | * Reads environment variables from the given file and adds/overrides them | |
892 | * into the environment. If the file does not exist, this does nothing. | |
893 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
894 | * and assignments of the form name=value. No other forms are allowed. | |
895 | */ | |
896 | static void | |
897 | read_environment_file(char ***env, u_int *envsize, | |
e9702f7d | 898 | const char *filename) |
3c0ef626 | 899 | { |
900 | FILE *f; | |
901 | char buf[4096]; | |
902 | char *cp, *value; | |
276b07a3 | 903 | u_int lineno = 0; |
3c0ef626 | 904 | |
905 | f = fopen(filename, "r"); | |
906 | if (!f) | |
907 | return; | |
908 | ||
909 | while (fgets(buf, sizeof(buf), f)) { | |
276b07a3 | 910 | if (++lineno > 1000) |
911 | fatal("Too many lines in environment file %s", filename); | |
3c0ef626 | 912 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
913 | ; | |
914 | if (!*cp || *cp == '#' || *cp == '\n') | |
915 | continue; | |
916 | if (strchr(cp, '\n')) | |
917 | *strchr(cp, '\n') = '\0'; | |
918 | value = strchr(cp, '='); | |
919 | if (value == NULL) { | |
276b07a3 | 920 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
921 | filename); | |
3c0ef626 | 922 | continue; |
923 | } | |
924 | /* | |
925 | * Replace the equals sign by nul, and advance value to | |
926 | * the value string. | |
927 | */ | |
928 | *value = '\0'; | |
929 | value++; | |
930 | child_set_env(env, envsize, cp, value); | |
931 | } | |
932 | fclose(f); | |
933 | } | |
934 | ||
75be3237 | 935 | #ifdef SESSION_HOOKS |
936 | #define SSH_SESSION_ENV_FILE "SSH_SESSION_ENV_FILE" | |
937 | ||
938 | typedef enum { no_op, execute, clear_env, restore_env, | |
939 | read_env, save_or_rm_env } session_action_t; | |
940 | ||
941 | static session_action_t action_order[2][5] = { | |
942 | { clear_env, read_env, execute, save_or_rm_env, restore_env }, /*shutdown*/ | |
943 | { execute, read_env, save_or_rm_env, no_op, no_op } /*startup */ | |
944 | }; | |
945 | ||
946 | static | |
947 | void execute_session_hook(char* prog, Authctxt *authctxt, | |
948 | int startup, int save) | |
949 | { | |
950 | extern char **environ; | |
951 | ||
952 | struct stat st; | |
953 | char **saved_env, **tmpenv; | |
954 | char *env_file = authctxt->session_env_file; | |
955 | int i, status = 0; | |
956 | ||
957 | for (i=0; i<5; i++) | |
958 | { | |
959 | switch (action_order[startup][i]) | |
960 | { | |
961 | case no_op: | |
962 | break; | |
963 | ||
964 | case execute: | |
965 | { | |
966 | FILE* fp; | |
967 | char buf[1000]; | |
968 | ||
969 | snprintf(buf, | |
970 | sizeof(buf), | |
971 | "%s -c '%s'", | |
972 | authctxt->pw->pw_shell, | |
973 | prog); | |
974 | ||
975 | debug("executing session hook: [%s]", buf); | |
976 | setenv(SSH_SESSION_ENV_FILE, env_file, /* overwrite = */ 1); | |
977 | ||
978 | /* flusing is recommended in the popen(3) man page, to avoid | |
979 | intermingling of output */ | |
980 | fflush(stdout); | |
981 | fflush(stderr); | |
982 | if ((fp=popen(buf, "w")) == NULL) | |
983 | { | |
984 | perror("Unable to run session hook"); | |
985 | return; | |
986 | } | |
987 | status = pclose(fp); | |
988 | debug2("session hook executed, status=%d", status); | |
989 | unsetenv(SSH_SESSION_ENV_FILE); | |
990 | } | |
991 | break; | |
992 | ||
993 | case clear_env: | |
994 | saved_env = environ; | |
995 | tmpenv = (char**) malloc(sizeof(char*)); | |
996 | tmpenv[0] = NULL; | |
997 | environ = tmpenv; | |
998 | break; | |
999 | ||
1000 | case restore_env: | |
1001 | environ = saved_env; | |
1002 | free(tmpenv); | |
1003 | break; | |
1004 | ||
1005 | case read_env: | |
1006 | if (status==0 && stat(env_file, &st)==0) | |
1007 | { | |
1008 | int envsize = 0; | |
1009 | ||
1010 | debug("reading environment from %s", env_file); | |
1011 | while (environ[envsize++]) ; | |
1012 | read_environment_file(&environ, &envsize, env_file); | |
1013 | } | |
1014 | break; | |
1015 | ||
1016 | case save_or_rm_env: | |
1017 | if (status==0 && save) | |
1018 | { | |
1019 | FILE* fp; | |
1020 | int envcount=0; | |
1021 | ||
1022 | debug2("saving environment to %s", env_file); | |
1023 | if ((fp = fopen(env_file, "w")) == NULL) /* hmm: file perms? */ | |
1024 | { | |
1025 | perror("Unable to save session hook info"); | |
1026 | } | |
1027 | while (environ[envcount]) | |
1028 | { | |
1029 | fprintf(fp, "%s\n", environ[envcount++]); | |
1030 | } | |
1031 | fflush(fp); | |
1032 | fclose(fp); | |
1033 | } | |
1034 | else if (stat(env_file, &st)==0) | |
1035 | { | |
1036 | debug2("removing environment file %s", env_file); | |
1037 | remove(env_file); | |
1038 | } | |
1039 | break; | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | } | |
1044 | #endif | |
1045 | ||
7cac2b65 | 1046 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
1047 | /* | |
1048 | * Return named variable from specified environment, or NULL if not present. | |
1049 | */ | |
1050 | static char * | |
1051 | child_get_env(char **env, const char *name) | |
1052 | { | |
1053 | int i; | |
1054 | size_t len; | |
1055 | ||
1056 | len = strlen(name); | |
1057 | for (i=0; env[i] != NULL; i++) | |
1058 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
1059 | return(env[i] + len + 1); | |
1060 | return NULL; | |
1061 | } | |
1062 | ||
1063 | /* | |
1064 | * Read /etc/default/login. | |
1065 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
1066 | */ | |
1067 | static void | |
1068 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
1069 | { | |
1070 | char **tmpenv = NULL, *var; | |
29d88157 | 1071 | u_int i, tmpenvsize = 0; |
7cac2b65 | 1072 | mode_t mask; |
1073 | ||
1074 | /* | |
1075 | * We don't want to copy the whole file to the child's environment, | |
1076 | * so we use a temporary environment and copy the variables we're | |
1077 | * interested in. | |
1078 | */ | |
1079 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
1080 | ||
29d88157 | 1081 | if (tmpenv == NULL) |
1082 | return; | |
1083 | ||
7cac2b65 | 1084 | if (uid == 0) |
1085 | var = child_get_env(tmpenv, "SUPATH"); | |
1086 | else | |
1087 | var = child_get_env(tmpenv, "PATH"); | |
1088 | if (var != NULL) | |
1089 | child_set_env(env, envsize, "PATH", var); | |
1090 | ||
1091 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) | |
1092 | if (sscanf(var, "%5lo", &mask) == 1) | |
1093 | umask(mask); | |
1094 | ||
1095 | for (i = 0; tmpenv[i] != NULL; i++) | |
1096 | xfree(tmpenv[i]); | |
1097 | xfree(tmpenv); | |
1098 | } | |
1099 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1100 | ||
e9702f7d | 1101 | void copy_environment(char **source, char ***env, u_int *envsize) |
3c0ef626 | 1102 | { |
e9702f7d | 1103 | char *var_name, *var_val; |
3c0ef626 | 1104 | int i; |
1105 | ||
e9702f7d | 1106 | if (source == NULL) |
3c0ef626 | 1107 | return; |
1108 | ||
e9702f7d | 1109 | for(i = 0; source[i] != NULL; i++) { |
1110 | var_name = xstrdup(source[i]); | |
1111 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
1112 | xfree(var_name); | |
3c0ef626 | 1113 | continue; |
3c0ef626 | 1114 | } |
e9702f7d | 1115 | *var_val++ = '\0'; |
3c0ef626 | 1116 | |
e9702f7d | 1117 | debug3("Copy environment: %s=%s", var_name, var_val); |
1118 | child_set_env(env, envsize, var_name, var_val); | |
1119 | ||
1120 | xfree(var_name); | |
3c0ef626 | 1121 | } |
3c0ef626 | 1122 | } |
1123 | ||
e9702f7d | 1124 | static char ** |
1125 | do_setup_env(Session *s, const char *shell) | |
3c0ef626 | 1126 | { |
3c0ef626 | 1127 | char buf[256]; |
e9702f7d | 1128 | u_int i, envsize; |
7cac2b65 | 1129 | char **env, *laddr, *path = NULL; |
e9702f7d | 1130 | struct passwd *pw = s->pw; |
3c0ef626 | 1131 | |
1132 | /* Initialize the environment. */ | |
1133 | envsize = 100; | |
1134 | env = xmalloc(envsize * sizeof(char *)); | |
1135 | env[0] = NULL; | |
1136 | ||
1137 | #ifdef HAVE_CYGWIN | |
1138 | /* | |
1139 | * The Windows environment contains some setting which are | |
1140 | * important for a running system. They must not be dropped. | |
1141 | */ | |
e9702f7d | 1142 | copy_environment(environ, &env, &envsize); |
3c0ef626 | 1143 | #endif |
1144 | ||
5598e598 | 1145 | #ifdef GSSAPI |
1146 | /* Allow any GSSAPI methods that we've used to alter | |
1147 | * the childs environment as they see fit | |
1148 | */ | |
7cac2b65 | 1149 | ssh_gssapi_do_child(&env, &envsize); |
5598e598 | 1150 | #endif |
1151 | ||
3c0ef626 | 1152 | if (!options.use_login) { |
1153 | /* Set basic environment. */ | |
1154 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1155 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
bfe49944 | 1156 | #ifdef _AIX |
1157 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1158 | #endif | |
3c0ef626 | 1159 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
1160 | #ifdef HAVE_LOGIN_CAP | |
d03f4262 | 1161 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1162 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1163 | else | |
1164 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
3c0ef626 | 1165 | #else /* HAVE_LOGIN_CAP */ |
1166 | # ifndef HAVE_CYGWIN | |
1167 | /* | |
1168 | * There's no standard path on Windows. The path contains | |
1169 | * important components pointing to the system directories, | |
1170 | * needed for loading shared libraries. So the path better | |
1171 | * remains intact here. | |
1172 | */ | |
2a67a1d1 | 1173 | if (getenv("LD_LIBRARY_PATH")) |
1174 | child_set_env(&env, &envsize, "LD_LIBRARY_PATH", | |
1175 | getenv("LD_LIBRARY_PATH")); | |
7cac2b65 | 1176 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1177 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1178 | path = child_get_env(env, "PATH"); | |
1179 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1180 | if (path == NULL || *path == '\0') { | |
1181 | child_set_env(&env, &envsize, "PATH", | |
1182 | s->pw->pw_uid == 0 ? | |
1183 | SUPERUSER_PATH : _PATH_STDPATH); | |
1184 | } | |
3c0ef626 | 1185 | # endif /* HAVE_CYGWIN */ |
1186 | #endif /* HAVE_LOGIN_CAP */ | |
1187 | ||
1188 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1189 | _PATH_MAILDIR, pw->pw_name); | |
1190 | child_set_env(&env, &envsize, "MAIL", buf); | |
1191 | ||
1192 | /* Normal systems set SHELL by default. */ | |
1193 | child_set_env(&env, &envsize, "SHELL", shell); | |
1194 | } | |
1195 | if (getenv("TZ")) | |
1196 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1197 | ||
1198 | /* Set custom environment options from RSA authentication. */ | |
1199 | if (!options.use_login) { | |
1200 | while (custom_environment) { | |
1201 | struct envstring *ce = custom_environment; | |
d03f4262 | 1202 | char *str = ce->s; |
e9702f7d | 1203 | |
d03f4262 | 1204 | for (i = 0; str[i] != '=' && str[i]; i++) |
3c0ef626 | 1205 | ; |
d03f4262 | 1206 | if (str[i] == '=') { |
1207 | str[i] = 0; | |
1208 | child_set_env(&env, &envsize, str, str + i + 1); | |
3c0ef626 | 1209 | } |
1210 | custom_environment = ce->next; | |
1211 | xfree(ce->s); | |
1212 | xfree(ce); | |
1213 | } | |
1214 | } | |
1215 | ||
d03f4262 | 1216 | /* SSH_CLIENT deprecated */ |
3c0ef626 | 1217 | snprintf(buf, sizeof buf, "%.50s %d %d", |
e9702f7d | 1218 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
3c0ef626 | 1219 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1220 | ||
bfe49944 | 1221 | laddr = get_local_ipaddr(packet_get_connection_in()); |
d03f4262 | 1222 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
bfe49944 | 1223 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1224 | xfree(laddr); | |
d03f4262 | 1225 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1226 | ||
3c0ef626 | 1227 | if (s->ttyfd != -1) |
1228 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1229 | if (s->term) | |
1230 | child_set_env(&env, &envsize, "TERM", s->term); | |
1231 | if (s->display) | |
1232 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
1233 | if (original_command) | |
1234 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1235 | original_command); | |
1236 | ||
d03f4262 | 1237 | #ifdef _UNICOS |
1238 | if (cray_tmpdir[0] != '\0') | |
1239 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1240 | #endif /* _UNICOS */ | |
1241 | ||
3c0ef626 | 1242 | #ifdef _AIX |
e9702f7d | 1243 | { |
1244 | char *cp; | |
1245 | ||
1246 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1247 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1248 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1249 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1250 | read_environment_file(&env, &envsize, "/etc/environment"); | |
1251 | } | |
3c0ef626 | 1252 | #endif |
3c0ef626 | 1253 | #ifdef KRB5 |
1254 | if (s->authctxt->krb5_ticket_file) | |
1255 | child_set_env(&env, &envsize, "KRB5CCNAME", | |
1256 | s->authctxt->krb5_ticket_file); | |
1257 | #endif | |
1258 | #ifdef USE_PAM | |
d03f4262 | 1259 | /* |
1260 | * Pull in any environment variables that may have | |
1261 | * been set by PAM. | |
1262 | */ | |
7cac2b65 | 1263 | if (options.use_pam) { |
1264 | char **p = fetch_pam_environment(); | |
d03f4262 | 1265 | |
d03f4262 | 1266 | copy_environment(p, &env, &envsize); |
1267 | free_pam_environment(p); | |
1268 | } | |
3c0ef626 | 1269 | #endif /* USE_PAM */ |
1270 | ||
44a053a3 | 1271 | if (auth_sock_name != NULL) |
3c0ef626 | 1272 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
44a053a3 | 1273 | auth_sock_name); |
3c0ef626 | 1274 | |
1275 | /* read $HOME/.ssh/environment. */ | |
d03f4262 | 1276 | if (options.permit_user_env && !options.use_login) { |
3c0ef626 | 1277 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
d03f4262 | 1278 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
3c0ef626 | 1279 | read_environment_file(&env, &envsize, buf); |
1280 | } | |
1281 | if (debug_flag) { | |
1282 | /* dump the environment */ | |
1283 | fprintf(stderr, "Environment:\n"); | |
1284 | for (i = 0; env[i]; i++) | |
1285 | fprintf(stderr, " %.200s\n", env[i]); | |
1286 | } | |
e9702f7d | 1287 | return env; |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1292 | * first in this order). | |
1293 | */ | |
1294 | static void | |
1295 | do_rc_files(Session *s, const char *shell) | |
1296 | { | |
1297 | FILE *f = NULL; | |
1298 | char cmd[1024]; | |
1299 | int do_xauth; | |
1300 | struct stat st; | |
1301 | ||
1302 | do_xauth = | |
1303 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1304 | ||
1305 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1306 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1307 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1308 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1309 | if (debug_flag) | |
1310 | fprintf(stderr, "Running %s\n", cmd); | |
1311 | f = popen(cmd, "w"); | |
1312 | if (f) { | |
1313 | if (do_xauth) | |
1314 | fprintf(f, "%s %s\n", s->auth_proto, | |
1315 | s->auth_data); | |
1316 | pclose(f); | |
1317 | } else | |
1318 | fprintf(stderr, "Could not run %s\n", | |
1319 | _PATH_SSH_USER_RC); | |
1320 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1321 | if (debug_flag) | |
1322 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1323 | _PATH_SSH_SYSTEM_RC); | |
1324 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1325 | if (f) { | |
1326 | if (do_xauth) | |
1327 | fprintf(f, "%s %s\n", s->auth_proto, | |
1328 | s->auth_data); | |
1329 | pclose(f); | |
1330 | } else | |
1331 | fprintf(stderr, "Could not run %s\n", | |
1332 | _PATH_SSH_SYSTEM_RC); | |
1333 | } else if (do_xauth && options.xauth_location != NULL) { | |
1334 | /* Add authority data to .Xauthority if appropriate. */ | |
1335 | if (debug_flag) { | |
1336 | fprintf(stderr, | |
bfe49944 | 1337 | "Running %.500s remove %.100s\n", |
1338 | options.xauth_location, s->auth_display); | |
1339 | fprintf(stderr, | |
1340 | "%.500s add %.100s %.100s %.100s\n", | |
e9702f7d | 1341 | options.xauth_location, s->auth_display, |
1342 | s->auth_proto, s->auth_data); | |
1343 | } | |
1344 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1345 | options.xauth_location); | |
1346 | f = popen(cmd, "w"); | |
1347 | if (f) { | |
bfe49944 | 1348 | fprintf(f, "remove %s\n", |
1349 | s->auth_display); | |
e9702f7d | 1350 | fprintf(f, "add %s %s %s\n", |
1351 | s->auth_display, s->auth_proto, | |
1352 | s->auth_data); | |
1353 | pclose(f); | |
1354 | } else { | |
1355 | fprintf(stderr, "Could not run %s\n", | |
1356 | cmd); | |
1357 | } | |
1358 | } | |
1359 | } | |
1360 | ||
1361 | static void | |
1362 | do_nologin(struct passwd *pw) | |
1363 | { | |
1364 | FILE *f = NULL; | |
1365 | char buf[1024]; | |
1366 | ||
1367 | #ifdef HAVE_LOGIN_CAP | |
1368 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1369 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1370 | _PATH_NOLOGIN), "r"); | |
1371 | #else | |
1372 | if (pw->pw_uid) | |
1373 | f = fopen(_PATH_NOLOGIN, "r"); | |
1374 | #endif | |
1375 | if (f) { | |
1376 | /* /etc/nologin exists. Print its contents and exit. */ | |
7cac2b65 | 1377 | logit("User %.100s not allowed because %s exists", |
d03f4262 | 1378 | pw->pw_name, _PATH_NOLOGIN); |
e9702f7d | 1379 | while (fgets(buf, sizeof(buf), f)) |
1380 | fputs(buf, stderr); | |
1381 | fclose(f); | |
bfe49944 | 1382 | fflush(NULL); |
e9702f7d | 1383 | exit(254); |
1384 | } | |
1385 | } | |
1386 | ||
1387 | /* Set login name, uid, gid, and groups. */ | |
350391c5 | 1388 | void |
e9702f7d | 1389 | do_setusercontext(struct passwd *pw) |
1390 | { | |
bfe49944 | 1391 | #ifndef HAVE_CYGWIN |
1392 | if (getuid() == 0 || geteuid() == 0) | |
e9702f7d | 1393 | #endif /* HAVE_CYGWIN */ |
bfe49944 | 1394 | { |
1395 | ||
44a053a3 | 1396 | #ifdef HAVE_SETPCRED |
7cac2b65 | 1397 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1398 | fatal("Failed to set process credentials"); | |
44a053a3 | 1399 | #endif /* HAVE_SETPCRED */ |
e9702f7d | 1400 | #ifdef HAVE_LOGIN_CAP |
d03f4262 | 1401 | # ifdef __bsdi__ |
276b07a3 | 1402 | setpgid(0, 0); |
d03f4262 | 1403 | # endif |
e9702f7d | 1404 | if (setusercontext(lc, pw, pw->pw_uid, |
1405 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1406 | perror("unable to set user context"); | |
1407 | exit(1); | |
1408 | } | |
1409 | #else | |
1410 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1411 | /* Sets login uid for accounting */ | |
1412 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1413 | error("setluid: %s", strerror(errno)); | |
1414 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1415 | ||
1416 | if (setlogin(pw->pw_name) < 0) | |
1417 | error("setlogin failed: %s", strerror(errno)); | |
1418 | if (setgid(pw->pw_gid) < 0) { | |
1419 | perror("setgid"); | |
1420 | exit(1); | |
1421 | } | |
1422 | /* Initialize the group list. */ | |
1423 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1424 | perror("initgroups"); | |
1425 | exit(1); | |
1426 | } | |
1427 | endgrent(); | |
1428 | # ifdef USE_PAM | |
1429 | /* | |
1430 | * PAM credentials may take the form of supplementary groups. | |
1431 | * These will have been wiped by the above initgroups() call. | |
1432 | * Reestablish them here. | |
1433 | */ | |
7cac2b65 | 1434 | if (options.use_pam) { |
1435 | do_pam_session(); | |
1436 | do_pam_setcred(0); | |
1437 | } | |
e9702f7d | 1438 | # endif /* USE_PAM */ |
1439 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1440 | irix_setusercontext(pw); | |
1441 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
276b07a3 | 1442 | # ifdef _AIX |
d03f4262 | 1443 | aix_usrinfo(pw); |
276b07a3 | 1444 | # endif /* _AIX */ |
e9702f7d | 1445 | /* Permanently switch to the desired uid. */ |
1446 | permanently_set_uid(pw); | |
1447 | #endif | |
1448 | } | |
bfe49944 | 1449 | |
1450 | #ifdef HAVE_CYGWIN | |
1451 | if (is_winnt) | |
1452 | #endif | |
e9702f7d | 1453 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1454 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1455 | } | |
1456 | ||
350391c5 | 1457 | static void |
1458 | launch_login(struct passwd *pw, const char *hostname) | |
1459 | { | |
1460 | /* Launch login(1). */ | |
1461 | ||
44a053a3 | 1462 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
350391c5 | 1463 | #ifdef xxxLOGIN_NEEDS_TERM |
44a053a3 | 1464 | (s->term ? s->term : "unknown"), |
350391c5 | 1465 | #endif /* LOGIN_NEEDS_TERM */ |
1466 | #ifdef LOGIN_NO_ENDOPT | |
1467 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1468 | #else | |
1469 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1470 | #endif | |
1471 | ||
1472 | /* Login couldn't be executed, die. */ | |
1473 | ||
1474 | perror("login"); | |
1475 | exit(1); | |
1476 | } | |
1477 | ||
e9702f7d | 1478 | /* |
1479 | * Performs common processing for the child, such as setting up the | |
1480 | * environment, closing extra file descriptors, setting the user and group | |
1481 | * ids, and executing the command or shell. | |
1482 | */ | |
1483 | void | |
1484 | do_child(Session *s, const char *command) | |
1485 | { | |
1486 | extern char **environ; | |
1487 | char **env; | |
1488 | char *argv[10]; | |
1489 | const char *shell, *shell0, *hostname = NULL; | |
1490 | struct passwd *pw = s->pw; | |
1491 | u_int i; | |
1492 | ||
62eb343a | 1493 | #ifdef AFS_KRB5 |
1494 | /* Default place to look for aklog. */ | |
1495 | #ifdef AKLOG_PATH | |
1496 | #define KPROGDIR AKLOG_PATH | |
1497 | #else | |
1498 | #define KPROGDIR "/usr/bin/aklog" | |
1499 | #endif /* AKLOG_PATH */ | |
1500 | ||
1501 | struct stat st; | |
1502 | char *aklog_path; | |
1503 | #endif /* AFS_KRB5 */ | |
1504 | ||
e9702f7d | 1505 | /* remove hostkey from the child's memory */ |
1506 | destroy_sensitive_data(); | |
1507 | ||
1508 | /* login(1) is only called if we execute the login shell */ | |
1509 | if (options.use_login && command != NULL) | |
1510 | options.use_login = 0; | |
1511 | ||
d03f4262 | 1512 | #ifdef _UNICOS |
1513 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1514 | #endif /* _UNICOS */ | |
1515 | ||
e9702f7d | 1516 | /* |
1517 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1518 | * switch, so we let login(1) to this for us. | |
1519 | */ | |
1520 | if (!options.use_login) { | |
1521 | #ifdef HAVE_OSF_SIA | |
bfe49944 | 1522 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
e9702f7d | 1523 | if (!check_quietlogin(s, command)) |
1524 | do_motd(); | |
1525 | #else /* HAVE_OSF_SIA */ | |
1526 | do_nologin(pw); | |
e9702f7d | 1527 | do_setusercontext(pw); |
1528 | #endif /* HAVE_OSF_SIA */ | |
1529 | } | |
1530 | ||
1531 | /* | |
1532 | * Get the shell from the password data. An empty shell field is | |
1533 | * legal, and means /bin/sh. | |
1534 | */ | |
1535 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
bfe49944 | 1536 | |
1537 | /* | |
1538 | * Make sure $SHELL points to the shell from the password file, | |
1539 | * even if shell is overridden from login.conf | |
1540 | */ | |
1541 | env = do_setup_env(s, shell); | |
1542 | ||
e9702f7d | 1543 | #ifdef HAVE_LOGIN_CAP |
1544 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1545 | #endif | |
1546 | ||
3c0ef626 | 1547 | /* we have to stash the hostname before we close our socket. */ |
1548 | if (options.use_login) | |
1549 | hostname = get_remote_name_or_ip(utmp_len, | |
7cac2b65 | 1550 | options.use_dns); |
3c0ef626 | 1551 | /* |
1552 | * Close the connection descriptors; note that this is the child, and | |
1553 | * the server will still have the socket open, and it is important | |
1554 | * that we do not shutdown it. Note that the descriptors cannot be | |
1555 | * closed before building the environment, as we call | |
1556 | * get_remote_ipaddr there. | |
1557 | */ | |
1558 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1559 | close(packet_get_connection_in()); | |
1560 | else { | |
1561 | close(packet_get_connection_in()); | |
1562 | close(packet_get_connection_out()); | |
1563 | } | |
1564 | /* | |
1565 | * Close all descriptors related to channels. They will still remain | |
1566 | * open in the parent. | |
1567 | */ | |
1568 | /* XXX better use close-on-exec? -markus */ | |
1569 | channel_close_all(); | |
1570 | ||
1571 | /* | |
1572 | * Close any extra file descriptors. Note that there may still be | |
1573 | * descriptors left by system functions. They will be closed later. | |
1574 | */ | |
1575 | endpwent(); | |
1576 | ||
1577 | /* | |
1578 | * Close any extra open file descriptors so that we don\'t have them | |
1579 | * hanging around in clients. Note that we want to do this after | |
1580 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1581 | * descriptors open. | |
1582 | */ | |
1583 | for (i = 3; i < 64; i++) | |
1584 | close(i); | |
1585 | ||
1586 | /* | |
e9702f7d | 1587 | * Must take new environment into use so that .ssh/rc, |
1588 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
3c0ef626 | 1589 | */ |
1590 | environ = env; | |
1591 | ||
62eb343a | 1592 | #ifdef AFS_KRB5 |
1593 | ||
1594 | /* User has authenticated, and if a ticket was going to be | |
1595 | * passed we would have it. KRB5CCNAME should already be set. | |
1596 | * Now try to get an AFS token using aklog. | |
1597 | */ | |
1598 | if (k_hasafs()) { /* Do we have AFS? */ | |
1599 | ||
1600 | aklog_path = xstrdup(KPROGDIR); | |
1601 | ||
1602 | /* | |
1603 | * Make sure it exists before we try to run it | |
1604 | */ | |
1605 | if (stat(aklog_path, &st) == 0) { | |
1606 | debug("Running %s to get afs token.",aklog_path); | |
1607 | system(aklog_path); | |
1608 | } else { | |
1609 | debug("%s does not exist.",aklog_path); | |
1610 | } | |
1611 | ||
1612 | xfree(aklog_path); | |
1613 | } | |
1614 | #endif /* AFS_KRB5 */ | |
1615 | ||
75be3237 | 1616 | #ifdef SESSION_HOOKS |
1617 | if (options.session_hooks_allow && | |
1618 | options.session_hooks_startup_cmd) | |
1619 | { | |
1620 | execute_session_hook(options.session_hooks_startup_cmd, | |
1621 | s->authctxt, | |
1622 | /* startup = */ 1, | |
1623 | options.session_hooks_shutdown_cmd != NULL); | |
1624 | } | |
1625 | #endif | |
3c0ef626 | 1626 | |
1627 | /* Change current directory to the user\'s home directory. */ | |
1628 | if (chdir(pw->pw_dir) < 0) { | |
1629 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1630 | pw->pw_dir, strerror(errno)); | |
1631 | #ifdef HAVE_LOGIN_CAP | |
1632 | if (login_getcapbool(lc, "requirehome", 0)) | |
1633 | exit(1); | |
1634 | #endif | |
1635 | } | |
1636 | ||
e9702f7d | 1637 | if (!options.use_login) |
1638 | do_rc_files(s, shell); | |
3c0ef626 | 1639 | |
1640 | /* restore SIGPIPE for child */ | |
1641 | signal(SIGPIPE, SIG_DFL); | |
1642 | ||
e9702f7d | 1643 | if (options.use_login) { |
350391c5 | 1644 | launch_login(pw, hostname); |
1645 | /* NEVERREACHED */ | |
e9702f7d | 1646 | } |
1647 | ||
1648 | /* Get the last component of the shell name. */ | |
1649 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1650 | shell0++; | |
1651 | else | |
1652 | shell0 = shell; | |
1653 | ||
3c0ef626 | 1654 | /* |
1655 | * If we have no command, execute the shell. In this case, the shell | |
1656 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1657 | * this is a login shell. | |
1658 | */ | |
1659 | if (!command) { | |
e9702f7d | 1660 | char argv0[256]; |
3c0ef626 | 1661 | |
e9702f7d | 1662 | /* Start the shell. Set initial character to '-'. */ |
1663 | argv0[0] = '-'; | |
3c0ef626 | 1664 | |
e9702f7d | 1665 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1666 | >= sizeof(argv0) - 1) { | |
1667 | errno = EINVAL; | |
3c0ef626 | 1668 | perror(shell); |
1669 | exit(1); | |
e9702f7d | 1670 | } |
3c0ef626 | 1671 | |
e9702f7d | 1672 | /* Execute the shell. */ |
1673 | argv[0] = argv0; | |
1674 | argv[1] = NULL; | |
5ab1e3bd | 1675 | execve(shell, argv, environ); |
3c0ef626 | 1676 | |
e9702f7d | 1677 | /* Executing the shell failed. */ |
1678 | perror(shell); | |
1679 | exit(1); | |
3c0ef626 | 1680 | } |
1681 | /* | |
1682 | * Execute the command using the user's shell. This uses the -c | |
1683 | * option to execute the command. | |
1684 | */ | |
e9702f7d | 1685 | argv[0] = (char *) shell0; |
3c0ef626 | 1686 | argv[1] = "-c"; |
1687 | argv[2] = (char *) command; | |
1688 | argv[3] = NULL; | |
5ab1e3bd | 1689 | execve(shell, argv, environ); |
3c0ef626 | 1690 | perror(shell); |
1691 | exit(1); | |
1692 | } | |
1693 | ||
1694 | Session * | |
1695 | session_new(void) | |
1696 | { | |
1697 | int i; | |
1698 | static int did_init = 0; | |
1699 | if (!did_init) { | |
1700 | debug("session_new: init"); | |
e9702f7d | 1701 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1702 | sessions[i].used = 0; |
1703 | } | |
1704 | did_init = 1; | |
1705 | } | |
e9702f7d | 1706 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1707 | Session *s = &sessions[i]; |
1708 | if (! s->used) { | |
1709 | memset(s, 0, sizeof(*s)); | |
1710 | s->chanid = -1; | |
1711 | s->ptyfd = -1; | |
1712 | s->ttyfd = -1; | |
1713 | s->used = 1; | |
1714 | s->self = i; | |
1715 | debug("session_new: session %d", i); | |
1716 | return s; | |
1717 | } | |
1718 | } | |
1719 | return NULL; | |
1720 | } | |
1721 | ||
1722 | static void | |
1723 | session_dump(void) | |
1724 | { | |
1725 | int i; | |
e9702f7d | 1726 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1727 | Session *s = &sessions[i]; |
44a053a3 | 1728 | debug("dump: used %d session %d %p channel %d pid %ld", |
3c0ef626 | 1729 | s->used, |
1730 | s->self, | |
1731 | s, | |
1732 | s->chanid, | |
44a053a3 | 1733 | (long)s->pid); |
3c0ef626 | 1734 | } |
1735 | } | |
1736 | ||
1737 | int | |
1738 | session_open(Authctxt *authctxt, int chanid) | |
1739 | { | |
1740 | Session *s = session_new(); | |
1741 | debug("session_open: channel %d", chanid); | |
1742 | if (s == NULL) { | |
1743 | error("no more sessions"); | |
1744 | return 0; | |
1745 | } | |
1746 | s->authctxt = authctxt; | |
1747 | s->pw = authctxt->pw; | |
1748 | if (s->pw == NULL) | |
1749 | fatal("no user for session %d", s->self); | |
1750 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1751 | s->chanid = chanid; | |
1752 | return 1; | |
1753 | } | |
1754 | ||
350391c5 | 1755 | Session * |
1756 | session_by_tty(char *tty) | |
1757 | { | |
1758 | int i; | |
1759 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1760 | Session *s = &sessions[i]; | |
1761 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1762 | debug("session_by_tty: session %d tty %s", i, tty); | |
1763 | return s; | |
1764 | } | |
1765 | } | |
1766 | debug("session_by_tty: unknown tty %.100s", tty); | |
1767 | session_dump(); | |
1768 | return NULL; | |
1769 | } | |
1770 | ||
3c0ef626 | 1771 | static Session * |
1772 | session_by_channel(int id) | |
1773 | { | |
1774 | int i; | |
e9702f7d | 1775 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1776 | Session *s = &sessions[i]; |
1777 | if (s->used && s->chanid == id) { | |
1778 | debug("session_by_channel: session %d channel %d", i, id); | |
1779 | return s; | |
1780 | } | |
1781 | } | |
1782 | debug("session_by_channel: unknown channel %d", id); | |
1783 | session_dump(); | |
1784 | return NULL; | |
1785 | } | |
1786 | ||
1787 | static Session * | |
1788 | session_by_pid(pid_t pid) | |
1789 | { | |
1790 | int i; | |
44a053a3 | 1791 | debug("session_by_pid: pid %ld", (long)pid); |
e9702f7d | 1792 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1793 | Session *s = &sessions[i]; |
1794 | if (s->used && s->pid == pid) | |
1795 | return s; | |
1796 | } | |
44a053a3 | 1797 | error("session_by_pid: unknown pid %ld", (long)pid); |
3c0ef626 | 1798 | session_dump(); |
1799 | return NULL; | |
1800 | } | |
1801 | ||
1802 | static int | |
1803 | session_window_change_req(Session *s) | |
1804 | { | |
1805 | s->col = packet_get_int(); | |
1806 | s->row = packet_get_int(); | |
1807 | s->xpixel = packet_get_int(); | |
1808 | s->ypixel = packet_get_int(); | |
e9702f7d | 1809 | packet_check_eom(); |
3c0ef626 | 1810 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1811 | return 1; | |
1812 | } | |
1813 | ||
1814 | static int | |
1815 | session_pty_req(Session *s) | |
1816 | { | |
1817 | u_int len; | |
1818 | int n_bytes; | |
1819 | ||
1820 | if (no_pty_flag) { | |
1821 | debug("Allocating a pty not permitted for this authentication."); | |
1822 | return 0; | |
1823 | } | |
1824 | if (s->ttyfd != -1) { | |
1825 | packet_disconnect("Protocol error: you already have a pty."); | |
1826 | return 0; | |
1827 | } | |
350391c5 | 1828 | /* Get the time and hostname when the user last logged in. */ |
1829 | if (options.print_lastlog) { | |
1830 | s->hostname[0] = '\0'; | |
1831 | s->last_login_time = get_last_login_time(s->pw->pw_uid, | |
1832 | s->pw->pw_name, s->hostname, sizeof(s->hostname)); | |
1833 | } | |
3c0ef626 | 1834 | |
1835 | s->term = packet_get_string(&len); | |
1836 | ||
1837 | if (compat20) { | |
1838 | s->col = packet_get_int(); | |
1839 | s->row = packet_get_int(); | |
1840 | } else { | |
1841 | s->row = packet_get_int(); | |
1842 | s->col = packet_get_int(); | |
1843 | } | |
1844 | s->xpixel = packet_get_int(); | |
1845 | s->ypixel = packet_get_int(); | |
1846 | ||
1847 | if (strcmp(s->term, "") == 0) { | |
1848 | xfree(s->term); | |
1849 | s->term = NULL; | |
1850 | } | |
1851 | ||
1852 | /* Allocate a pty and open it. */ | |
1853 | debug("Allocating pty."); | |
350391c5 | 1854 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
3c0ef626 | 1855 | if (s->term) |
1856 | xfree(s->term); | |
1857 | s->term = NULL; | |
1858 | s->ptyfd = -1; | |
1859 | s->ttyfd = -1; | |
1860 | error("session_pty_req: session %d alloc failed", s->self); | |
1861 | return 0; | |
1862 | } | |
1863 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1864 | ||
1865 | /* for SSH1 the tty modes length is not given */ | |
1866 | if (!compat20) | |
1867 | n_bytes = packet_remaining(); | |
1868 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1869 | ||
1870 | /* | |
1871 | * Add a cleanup function to clear the utmp entry and record logout | |
1872 | * time in case we call fatal() (e.g., the connection gets closed). | |
1873 | */ | |
1874 | fatal_add_cleanup(session_pty_cleanup, (void *)s); | |
350391c5 | 1875 | if (!use_privsep) |
1876 | pty_setowner(s->pw, s->tty); | |
3c0ef626 | 1877 | |
1878 | /* Set window size from the packet. */ | |
1879 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1880 | ||
e9702f7d | 1881 | packet_check_eom(); |
3c0ef626 | 1882 | session_proctitle(s); |
1883 | return 1; | |
1884 | } | |
1885 | ||
1886 | static int | |
1887 | session_subsystem_req(Session *s) | |
1888 | { | |
1889 | struct stat st; | |
1890 | u_int len; | |
1891 | int success = 0; | |
1892 | char *cmd, *subsys = packet_get_string(&len); | |
1893 | int i; | |
1894 | ||
e9702f7d | 1895 | packet_check_eom(); |
7cac2b65 | 1896 | logit("subsystem request for %.100s", subsys); |
3c0ef626 | 1897 | |
1898 | for (i = 0; i < options.num_subsystems; i++) { | |
1899 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1900 | cmd = options.subsystem_command[i]; | |
1901 | if (stat(cmd, &st) < 0) { | |
1902 | error("subsystem: cannot stat %s: %s", cmd, | |
1903 | strerror(errno)); | |
1904 | break; | |
1905 | } | |
1906 | debug("subsystem: exec() %s", cmd); | |
1907 | s->is_subsystem = 1; | |
1908 | do_exec(s, cmd); | |
1909 | success = 1; | |
e9702f7d | 1910 | break; |
3c0ef626 | 1911 | } |
1912 | } | |
1913 | ||
1914 | if (!success) | |
7cac2b65 | 1915 | logit("subsystem request for %.100s failed, subsystem not found", |
3c0ef626 | 1916 | subsys); |
1917 | ||
1918 | xfree(subsys); | |
1919 | return success; | |
1920 | } | |
1921 | ||
1922 | static int | |
1923 | session_x11_req(Session *s) | |
1924 | { | |
1925 | int success; | |
1926 | ||
1927 | s->single_connection = packet_get_char(); | |
1928 | s->auth_proto = packet_get_string(NULL); | |
1929 | s->auth_data = packet_get_string(NULL); | |
1930 | s->screen = packet_get_int(); | |
e9702f7d | 1931 | packet_check_eom(); |
3c0ef626 | 1932 | |
1933 | success = session_setup_x11fwd(s); | |
1934 | if (!success) { | |
1935 | xfree(s->auth_proto); | |
1936 | xfree(s->auth_data); | |
1937 | s->auth_proto = NULL; | |
1938 | s->auth_data = NULL; | |
1939 | } | |
1940 | return success; | |
1941 | } | |
1942 | ||
1943 | static int | |
1944 | session_shell_req(Session *s) | |
1945 | { | |
e9702f7d | 1946 | packet_check_eom(); |
3c0ef626 | 1947 | do_exec(s, NULL); |
1948 | return 1; | |
1949 | } | |
1950 | ||
1951 | static int | |
1952 | session_exec_req(Session *s) | |
1953 | { | |
1954 | u_int len; | |
1955 | char *command = packet_get_string(&len); | |
e9702f7d | 1956 | packet_check_eom(); |
3c0ef626 | 1957 | do_exec(s, command); |
1958 | xfree(command); | |
1959 | return 1; | |
1960 | } | |
1961 | ||
7cac2b65 | 1962 | static int |
1963 | session_break_req(Session *s) | |
1964 | { | |
1965 | u_int break_length; | |
1966 | ||
1967 | break_length = packet_get_int(); /* ignored */ | |
1968 | packet_check_eom(); | |
1969 | ||
1970 | if (s->ttyfd == -1 || | |
1971 | tcsendbreak(s->ttyfd, 0) < 0) | |
1972 | return 0; | |
1973 | return 1; | |
1974 | } | |
1975 | ||
3c0ef626 | 1976 | static int |
1977 | session_auth_agent_req(Session *s) | |
1978 | { | |
1979 | static int called = 0; | |
e9702f7d | 1980 | packet_check_eom(); |
3c0ef626 | 1981 | if (no_agent_forwarding_flag) { |
1982 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1983 | return 0; | |
1984 | } | |
1985 | if (called) { | |
1986 | return 0; | |
1987 | } else { | |
1988 | called = 1; | |
1989 | return auth_input_request_forwarding(s->pw); | |
1990 | } | |
1991 | } | |
1992 | ||
e9702f7d | 1993 | int |
1994 | session_input_channel_req(Channel *c, const char *rtype) | |
3c0ef626 | 1995 | { |
3c0ef626 | 1996 | int success = 0; |
3c0ef626 | 1997 | Session *s; |
3c0ef626 | 1998 | |
e9702f7d | 1999 | if ((s = session_by_channel(c->self)) == NULL) { |
7cac2b65 | 2000 | logit("session_input_channel_req: no session %d req %.100s", |
e9702f7d | 2001 | c->self, rtype); |
2002 | return 0; | |
2003 | } | |
2004 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
3c0ef626 | 2005 | |
2006 | /* | |
2007 | * a session is in LARVAL state until a shell, a command | |
2008 | * or a subsystem is executed | |
2009 | */ | |
2010 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2011 | if (strcmp(rtype, "shell") == 0) { | |
2012 | success = session_shell_req(s); | |
2013 | } else if (strcmp(rtype, "exec") == 0) { | |
2014 | success = session_exec_req(s); | |
2015 | } else if (strcmp(rtype, "pty-req") == 0) { | |
2016 | success = session_pty_req(s); | |
2017 | } else if (strcmp(rtype, "x11-req") == 0) { | |
2018 | success = session_x11_req(s); | |
2019 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { | |
2020 | success = session_auth_agent_req(s); | |
2021 | } else if (strcmp(rtype, "subsystem") == 0) { | |
2022 | success = session_subsystem_req(s); | |
7cac2b65 | 2023 | } else if (strcmp(rtype, "break") == 0) { |
2024 | success = session_break_req(s); | |
3c0ef626 | 2025 | } |
2026 | } | |
2027 | if (strcmp(rtype, "window-change") == 0) { | |
2028 | success = session_window_change_req(s); | |
2029 | } | |
e9702f7d | 2030 | return success; |
3c0ef626 | 2031 | } |
2032 | ||
2033 | void | |
2034 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2035 | { | |
2036 | if (!compat20) | |
2037 | fatal("session_set_fds: called for proto != 2.0"); | |
2038 | /* | |
2039 | * now that have a child and a pipe to the child, | |
2040 | * we can activate our channel and register the fd's | |
2041 | */ | |
2042 | if (s->chanid == -1) | |
2043 | fatal("no channel for session %d", s->self); | |
2044 | channel_set_fds(s->chanid, | |
2045 | fdout, fdin, fderr, | |
2046 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
e9702f7d | 2047 | 1, |
2048 | CHAN_SES_WINDOW_DEFAULT); | |
3c0ef626 | 2049 | } |
2050 | ||
2051 | /* | |
2052 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2053 | * (e.g., due to a dropped connection). | |
2054 | */ | |
350391c5 | 2055 | void |
2056 | session_pty_cleanup2(void *session) | |
3c0ef626 | 2057 | { |
2058 | Session *s = session; | |
2059 | ||
2060 | if (s == NULL) { | |
2061 | error("session_pty_cleanup: no session"); | |
2062 | return; | |
2063 | } | |
2064 | if (s->ttyfd == -1) | |
2065 | return; | |
2066 | ||
2067 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); | |
2068 | ||
2069 | /* Record that the user has logged out. */ | |
2070 | if (s->pid != 0) | |
e9702f7d | 2071 | record_logout(s->pid, s->tty, s->pw->pw_name); |
3c0ef626 | 2072 | |
2073 | /* Release the pseudo-tty. */ | |
350391c5 | 2074 | if (getuid() == 0) |
2075 | pty_release(s->tty); | |
3c0ef626 | 2076 | |
2077 | /* | |
2078 | * Close the server side of the socket pairs. We must do this after | |
2079 | * the pty cleanup, so that another process doesn't get this pty | |
2080 | * while we're still cleaning up. | |
2081 | */ | |
2082 | if (close(s->ptymaster) < 0) | |
350391c5 | 2083 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
3c0ef626 | 2084 | |
2085 | /* unlink pty from session */ | |
2086 | s->ttyfd = -1; | |
2087 | } | |
2088 | ||
350391c5 | 2089 | void |
2090 | session_pty_cleanup(void *session) | |
2091 | { | |
2092 | PRIVSEP(session_pty_cleanup2(session)); | |
2093 | } | |
2094 | ||
d03f4262 | 2095 | static char * |
2096 | sig2name(int sig) | |
2097 | { | |
2098 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2099 | SSH_SIG(ABRT); | |
2100 | SSH_SIG(ALRM); | |
2101 | SSH_SIG(FPE); | |
2102 | SSH_SIG(HUP); | |
2103 | SSH_SIG(ILL); | |
2104 | SSH_SIG(INT); | |
2105 | SSH_SIG(KILL); | |
2106 | SSH_SIG(PIPE); | |
2107 | SSH_SIG(QUIT); | |
2108 | SSH_SIG(SEGV); | |
2109 | SSH_SIG(TERM); | |
2110 | SSH_SIG(USR1); | |
2111 | SSH_SIG(USR2); | |
2112 | #undef SSH_SIG | |
2113 | return "SIG@openssh.com"; | |
2114 | } | |
2115 | ||
3c0ef626 | 2116 | static void |
2117 | session_exit_message(Session *s, int status) | |
2118 | { | |
2119 | Channel *c; | |
e9702f7d | 2120 | |
2121 | if ((c = channel_lookup(s->chanid)) == NULL) | |
3c0ef626 | 2122 | fatal("session_exit_message: session %d: no channel %d", |
2123 | s->self, s->chanid); | |
44a053a3 | 2124 | debug("session_exit_message: session %d channel %d pid %ld", |
2125 | s->self, s->chanid, (long)s->pid); | |
3c0ef626 | 2126 | |
2127 | if (WIFEXITED(status)) { | |
e9702f7d | 2128 | channel_request_start(s->chanid, "exit-status", 0); |
3c0ef626 | 2129 | packet_put_int(WEXITSTATUS(status)); |
2130 | packet_send(); | |
2131 | } else if (WIFSIGNALED(status)) { | |
e9702f7d | 2132 | channel_request_start(s->chanid, "exit-signal", 0); |
d03f4262 | 2133 | packet_put_cstring(sig2name(WTERMSIG(status))); |
3c0ef626 | 2134 | #ifdef WCOREDUMP |
2135 | packet_put_char(WCOREDUMP(status)); | |
2136 | #else /* WCOREDUMP */ | |
2137 | packet_put_char(0); | |
2138 | #endif /* WCOREDUMP */ | |
2139 | packet_put_cstring(""); | |
2140 | packet_put_cstring(""); | |
2141 | packet_send(); | |
2142 | } else { | |
2143 | /* Some weird exit cause. Just exit. */ | |
2144 | packet_disconnect("wait returned status %04x.", status); | |
2145 | } | |
2146 | ||
2147 | /* disconnect channel */ | |
2148 | debug("session_exit_message: release channel %d", s->chanid); | |
2149 | channel_cancel_cleanup(s->chanid); | |
2150 | /* | |
2151 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2152 | * interested in data we write. | |
2153 | * Note that we must not call 'chan_read_failed', since there could | |
2154 | * be some more data waiting in the pipe. | |
2155 | */ | |
2156 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2157 | chan_write_failed(c); | |
2158 | s->chanid = -1; | |
2159 | } | |
2160 | ||
350391c5 | 2161 | void |
3c0ef626 | 2162 | session_close(Session *s) |
2163 | { | |
44a053a3 | 2164 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
3c0ef626 | 2165 | if (s->ttyfd != -1) { |
2166 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
2167 | session_pty_cleanup(s); | |
2168 | } | |
2169 | if (s->term) | |
2170 | xfree(s->term); | |
2171 | if (s->display) | |
2172 | xfree(s->display); | |
e9702f7d | 2173 | if (s->auth_display) |
2174 | xfree(s->auth_display); | |
3c0ef626 | 2175 | if (s->auth_data) |
2176 | xfree(s->auth_data); | |
2177 | if (s->auth_proto) | |
2178 | xfree(s->auth_proto); | |
2179 | s->used = 0; | |
2180 | session_proctitle(s); | |
2181 | } | |
2182 | ||
2183 | void | |
2184 | session_close_by_pid(pid_t pid, int status) | |
2185 | { | |
2186 | Session *s = session_by_pid(pid); | |
2187 | if (s == NULL) { | |
44a053a3 | 2188 | debug("session_close_by_pid: no session for pid %ld", |
2189 | (long)pid); | |
3c0ef626 | 2190 | return; |
2191 | } | |
2192 | if (s->chanid != -1) | |
2193 | session_exit_message(s, status); | |
2194 | session_close(s); | |
2195 | } | |
2196 | ||
2197 | /* | |
2198 | * this is called when a channel dies before | |
2199 | * the session 'child' itself dies | |
2200 | */ | |
2201 | void | |
2202 | session_close_by_channel(int id, void *arg) | |
2203 | { | |
2204 | Session *s = session_by_channel(id); | |
2205 | if (s == NULL) { | |
2206 | debug("session_close_by_channel: no session for id %d", id); | |
2207 | return; | |
2208 | } | |
44a053a3 | 2209 | debug("session_close_by_channel: channel %d child %ld", |
2210 | id, (long)s->pid); | |
3c0ef626 | 2211 | if (s->pid != 0) { |
2212 | debug("session_close_by_channel: channel %d: has child", id); | |
2213 | /* | |
2214 | * delay detach of session, but release pty, since | |
2215 | * the fd's to the child are already closed | |
2216 | */ | |
2217 | if (s->ttyfd != -1) { | |
2218 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
2219 | session_pty_cleanup(s); | |
2220 | } | |
2221 | return; | |
2222 | } | |
2223 | /* detach by removing callback */ | |
2224 | channel_cancel_cleanup(s->chanid); | |
2225 | s->chanid = -1; | |
2226 | session_close(s); | |
2227 | } | |
2228 | ||
2229 | void | |
350391c5 | 2230 | session_destroy_all(void (*closefunc)(Session *)) |
3c0ef626 | 2231 | { |
2232 | int i; | |
e9702f7d | 2233 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2234 | Session *s = &sessions[i]; |
350391c5 | 2235 | if (s->used) { |
2236 | if (closefunc != NULL) | |
2237 | closefunc(s); | |
2238 | else | |
2239 | session_close(s); | |
2240 | } | |
3c0ef626 | 2241 | } |
2242 | } | |
2243 | ||
2244 | static char * | |
2245 | session_tty_list(void) | |
2246 | { | |
2247 | static char buf[1024]; | |
2248 | int i; | |
bfe49944 | 2249 | char *cp; |
2250 | ||
3c0ef626 | 2251 | buf[0] = '\0'; |
e9702f7d | 2252 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2253 | Session *s = &sessions[i]; |
2254 | if (s->used && s->ttyfd != -1) { | |
bfe49944 | 2255 | |
2256 | if (strncmp(s->tty, "/dev/", 5) != 0) { | |
2257 | cp = strrchr(s->tty, '/'); | |
2258 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2259 | } else | |
2260 | cp = s->tty + 5; | |
2261 | ||
3c0ef626 | 2262 | if (buf[0] != '\0') |
2263 | strlcat(buf, ",", sizeof buf); | |
bfe49944 | 2264 | strlcat(buf, cp, sizeof buf); |
3c0ef626 | 2265 | } |
2266 | } | |
2267 | if (buf[0] == '\0') | |
2268 | strlcpy(buf, "notty", sizeof buf); | |
2269 | return buf; | |
2270 | } | |
2271 | ||
2272 | void | |
2273 | session_proctitle(Session *s) | |
2274 | { | |
2275 | if (s->pw == NULL) | |
2276 | error("no user for session %d", s->self); | |
2277 | else | |
2278 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2279 | } | |
2280 | ||
2281 | int | |
2282 | session_setup_x11fwd(Session *s) | |
2283 | { | |
2284 | struct stat st; | |
e9702f7d | 2285 | char display[512], auth_display[512]; |
2286 | char hostname[MAXHOSTNAMELEN]; | |
3c0ef626 | 2287 | |
2288 | if (no_x11_forwarding_flag) { | |
2289 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2290 | return 0; | |
2291 | } | |
2292 | if (!options.x11_forwarding) { | |
2293 | debug("X11 forwarding disabled in server configuration file."); | |
2294 | return 0; | |
2295 | } | |
2296 | if (!options.xauth_location || | |
2297 | (stat(options.xauth_location, &st) == -1)) { | |
2298 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2299 | return 0; | |
2300 | } | |
2301 | if (options.use_login) { | |
2302 | packet_send_debug("X11 forwarding disabled; " | |
2303 | "not compatible with UseLogin=yes."); | |
2304 | return 0; | |
2305 | } | |
2306 | if (s->display != NULL) { | |
2307 | debug("X11 display already set."); | |
2308 | return 0; | |
2309 | } | |
276b07a3 | 2310 | if (x11_create_display_inet(options.x11_display_offset, |
2311 | options.x11_use_localhost, s->single_connection, | |
2312 | &s->display_number) == -1) { | |
3c0ef626 | 2313 | debug("x11_create_display_inet failed."); |
2314 | return 0; | |
2315 | } | |
e9702f7d | 2316 | |
2317 | /* Set up a suitable value for the DISPLAY variable. */ | |
2318 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2319 | fatal("gethostname: %.100s", strerror(errno)); | |
2320 | /* | |
2321 | * auth_display must be used as the displayname when the | |
2322 | * authorization entry is added with xauth(1). This will be | |
2323 | * different than the DISPLAY string for localhost displays. | |
2324 | */ | |
2325 | if (options.x11_use_localhost) { | |
276b07a3 | 2326 | snprintf(display, sizeof display, "localhost:%u.%u", |
e9702f7d | 2327 | s->display_number, s->screen); |
276b07a3 | 2328 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
e9702f7d | 2329 | s->display_number, s->screen); |
2330 | s->display = xstrdup(display); | |
2331 | s->auth_display = xstrdup(auth_display); | |
2332 | } else { | |
2333 | #ifdef IPADDR_IN_DISPLAY | |
2334 | struct hostent *he; | |
2335 | struct in_addr my_addr; | |
2336 | ||
2337 | he = gethostbyname(hostname); | |
2338 | if (he == NULL) { | |
2339 | error("Can't get IP address for X11 DISPLAY."); | |
2340 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2341 | return 0; | |
2342 | } | |
2343 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
276b07a3 | 2344 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
e9702f7d | 2345 | s->display_number, s->screen); |
2346 | #else | |
276b07a3 | 2347 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
e9702f7d | 2348 | s->display_number, s->screen); |
2349 | #endif | |
2350 | s->display = xstrdup(display); | |
2351 | s->auth_display = xstrdup(display); | |
2352 | } | |
2353 | ||
3c0ef626 | 2354 | return 1; |
2355 | } | |
2356 | ||
2357 | static void | |
2358 | do_authenticated2(Authctxt *authctxt) | |
2359 | { | |
2360 | server_loop2(authctxt); | |
5598e598 | 2361 | #if defined(GSSAPI) |
7cac2b65 | 2362 | if (options.gss_cleanup_creds) |
2363 | ssh_gssapi_cleanup_creds(NULL); | |
5598e598 | 2364 | #endif |
3c0ef626 | 2365 | } |