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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" | |
1c14df9e | 36 | RCSID("$OpenBSD: session.c,v 1.154 2003/03/05 22:33:43 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" | |
2980ea68 | 59 | #include "monitor_wrap.h" |
3c0ef626 | 60 | |
b9a54c29 | 61 | #ifdef GSSAPI |
62 | #include "ssh-gss.h" | |
63 | #endif | |
64 | ||
3c0ef626 | 65 | #ifdef HAVE_CYGWIN |
66 | #include <windows.h> | |
67 | #include <sys/cygwin.h> | |
68 | #define is_winnt (GetVersion() < 0x80000000) | |
69 | #endif | |
70 | ||
3c0ef626 | 71 | /* func */ |
72 | ||
73 | Session *session_new(void); | |
74 | void session_set_fds(Session *, int, int, int); | |
2980ea68 | 75 | void session_pty_cleanup(void *); |
3c0ef626 | 76 | void session_proctitle(Session *); |
77 | int session_setup_x11fwd(Session *); | |
78 | void do_exec_pty(Session *, const char *); | |
79 | void do_exec_no_pty(Session *, const char *); | |
80 | void do_exec(Session *, const char *); | |
81 | void do_login(Session *, const char *); | |
82 | #ifdef LOGIN_NEEDS_UTMPX | |
83 | static void do_pre_login(Session *s); | |
84 | #endif | |
85 | void do_child(Session *, const char *); | |
86 | void do_motd(void); | |
87 | int check_quietlogin(Session *, const char *); | |
88 | ||
89 | static void do_authenticated1(Authctxt *); | |
90 | static void do_authenticated2(Authctxt *); | |
91 | ||
3c0ef626 | 92 | static int session_pty_req(Session *); |
93 | ||
88928908 | 94 | #ifdef SESSION_HOOKS |
95 | static void execute_session_hook(char* prog, Authctxt *authctxt, | |
96 | int startup, int save); | |
97 | #endif | |
98 | ||
3c0ef626 | 99 | /* import */ |
100 | extern ServerOptions options; | |
101 | extern char *__progname; | |
102 | extern int log_stderr; | |
103 | extern int debug_flag; | |
104 | extern u_int utmp_len; | |
105 | extern int startup_pipe; | |
106 | extern void destroy_sensitive_data(void); | |
107 | ||
108 | /* original command from peer. */ | |
109 | const char *original_command = NULL; | |
110 | ||
111 | /* data */ | |
112 | #define MAX_SESSIONS 10 | |
113 | Session sessions[MAX_SESSIONS]; | |
114 | ||
115 | #ifdef WITH_AIXAUTHENTICATE | |
116 | char *aixloginmsg; | |
117 | #endif /* WITH_AIXAUTHENTICATE */ | |
118 | ||
119 | #ifdef HAVE_LOGIN_CAP | |
2980ea68 | 120 | login_cap_t *lc; |
3c0ef626 | 121 | #endif |
122 | ||
ff2d7a98 | 123 | /* Name and directory of socket for authentication agent forwarding. */ |
124 | static char *auth_sock_name = NULL; | |
125 | static char *auth_sock_dir = NULL; | |
126 | ||
127 | /* removes the agent forwarding socket */ | |
128 | ||
129 | static void | |
130 | auth_sock_cleanup_proc(void *_pw) | |
131 | { | |
132 | struct passwd *pw = _pw; | |
133 | ||
134 | if (auth_sock_name != NULL) { | |
135 | temporarily_use_uid(pw); | |
136 | unlink(auth_sock_name); | |
137 | rmdir(auth_sock_dir); | |
138 | auth_sock_name = NULL; | |
139 | restore_uid(); | |
140 | } | |
141 | } | |
142 | ||
143 | static int | |
144 | auth_input_request_forwarding(struct passwd * pw) | |
145 | { | |
146 | Channel *nc; | |
147 | int sock; | |
148 | struct sockaddr_un sunaddr; | |
149 | ||
150 | if (auth_sock_name != NULL) { | |
151 | error("authentication forwarding requested twice."); | |
152 | return 0; | |
153 | } | |
154 | ||
155 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
156 | temporarily_use_uid(pw); | |
157 | ||
158 | /* Allocate a buffer for the socket name, and format the name. */ | |
159 | auth_sock_name = xmalloc(MAXPATHLEN); | |
160 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
161 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
162 | ||
163 | /* Create private directory for socket */ | |
164 | if (mkdtemp(auth_sock_dir) == NULL) { | |
165 | packet_send_debug("Agent forwarding disabled: " | |
166 | "mkdtemp() failed: %.100s", strerror(errno)); | |
167 | restore_uid(); | |
168 | xfree(auth_sock_name); | |
169 | xfree(auth_sock_dir); | |
170 | auth_sock_name = NULL; | |
171 | auth_sock_dir = NULL; | |
172 | return 0; | |
173 | } | |
174 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", | |
175 | auth_sock_dir, (long) getpid()); | |
176 | ||
177 | /* delete agent socket on fatal() */ | |
178 | fatal_add_cleanup(auth_sock_cleanup_proc, pw); | |
179 | ||
180 | /* Create the socket. */ | |
181 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
182 | if (sock < 0) | |
183 | packet_disconnect("socket: %.100s", strerror(errno)); | |
184 | ||
185 | /* Bind it to the name. */ | |
186 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
187 | sunaddr.sun_family = AF_UNIX; | |
188 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
189 | ||
190 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
191 | packet_disconnect("bind: %.100s", strerror(errno)); | |
192 | ||
193 | /* Restore the privileged uid. */ | |
194 | restore_uid(); | |
195 | ||
196 | /* Start listening on the socket. */ | |
197 | if (listen(sock, 5) < 0) | |
198 | packet_disconnect("listen: %.100s", strerror(errno)); | |
199 | ||
200 | /* Allocate a channel for the authentication agent socket. */ | |
201 | nc = channel_new("auth socket", | |
202 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
203 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
204 | 0, xstrdup("auth socket"), 1); | |
205 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); | |
206 | return 1; | |
207 | } | |
208 | ||
209 | ||
3c0ef626 | 210 | void |
211 | do_authenticated(Authctxt *authctxt) | |
212 | { | |
1c14df9e | 213 | setproctitle("%s", authctxt->pw->pw_name); |
214 | ||
3c0ef626 | 215 | /* |
216 | * Cancel the alarm we set to limit the time taken for | |
217 | * authentication. | |
218 | */ | |
219 | alarm(0); | |
220 | if (startup_pipe != -1) { | |
221 | close(startup_pipe); | |
222 | startup_pipe = -1; | |
223 | } | |
3c0ef626 | 224 | |
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 | ||
234 | /* remove agent socket */ | |
ff2d7a98 | 235 | if (auth_sock_name != NULL) |
3c0ef626 | 236 | auth_sock_cleanup_proc(authctxt->pw); |
88928908 | 237 | |
238 | #ifdef SESSION_HOOKS | |
239 | if (options.session_hooks_allow && | |
240 | options.session_hooks_shutdown_cmd) | |
241 | { | |
242 | execute_session_hook(options.session_hooks_shutdown_cmd, | |
243 | authctxt, | |
244 | /* startup = */ 0, /* save = */ 0); | |
245 | ||
246 | if (authctxt->session_env_file) | |
247 | { | |
248 | free(authctxt->session_env_file); | |
249 | } | |
250 | } | |
251 | #endif | |
3c0ef626 | 252 | #ifdef KRB4 |
253 | if (options.kerberos_ticket_cleanup) | |
254 | krb4_cleanup_proc(authctxt); | |
255 | #endif | |
256 | #ifdef KRB5 | |
257 | if (options.kerberos_ticket_cleanup) | |
258 | krb5_cleanup_proc(authctxt); | |
259 | #endif | |
260 | } | |
261 | ||
262 | /* | |
263 | * Prepares for an interactive session. This is called after the user has | |
264 | * been successfully authenticated. During this message exchange, pseudo | |
265 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
266 | * are requested, etc. | |
267 | */ | |
268 | static void | |
269 | do_authenticated1(Authctxt *authctxt) | |
270 | { | |
271 | Session *s; | |
272 | char *command; | |
e9a17296 | 273 | int success, type, screen_flag; |
ff2d7a98 | 274 | int enable_compression_after_reply = 0; |
275 | u_int proto_len, data_len, dlen, compression_level = 0; | |
3c0ef626 | 276 | |
277 | s = session_new(); | |
278 | s->authctxt = authctxt; | |
279 | s->pw = authctxt->pw; | |
280 | ||
281 | /* | |
282 | * We stay in this loop until the client requests to execute a shell | |
283 | * or a command. | |
284 | */ | |
285 | for (;;) { | |
286 | success = 0; | |
287 | ||
288 | /* Get a packet from the client. */ | |
e9a17296 | 289 | type = packet_read(); |
3c0ef626 | 290 | |
291 | /* Process the packet. */ | |
292 | switch (type) { | |
293 | case SSH_CMSG_REQUEST_COMPRESSION: | |
3c0ef626 | 294 | compression_level = packet_get_int(); |
e9a17296 | 295 | packet_check_eom(); |
3c0ef626 | 296 | if (compression_level < 1 || compression_level > 9) { |
297 | packet_send_debug("Received illegal compression level %d.", | |
e9a17296 | 298 | compression_level); |
3c0ef626 | 299 | break; |
300 | } | |
ff2d7a98 | 301 | if (!options.compression) { |
302 | debug2("compression disabled"); | |
303 | break; | |
304 | } | |
3c0ef626 | 305 | /* Enable compression after we have responded with SUCCESS. */ |
306 | enable_compression_after_reply = 1; | |
307 | success = 1; | |
308 | break; | |
309 | ||
310 | case SSH_CMSG_REQUEST_PTY: | |
311 | success = session_pty_req(s); | |
312 | break; | |
313 | ||
314 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
315 | s->auth_proto = packet_get_string(&proto_len); | |
316 | s->auth_data = packet_get_string(&data_len); | |
317 | ||
318 | screen_flag = packet_get_protocol_flags() & | |
319 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
320 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
321 | ||
322 | if (packet_remaining() == 4) { | |
323 | if (!screen_flag) | |
324 | debug2("Buggy client: " | |
325 | "X11 screen flag missing"); | |
326 | s->screen = packet_get_int(); | |
327 | } else { | |
328 | s->screen = 0; | |
329 | } | |
e9a17296 | 330 | packet_check_eom(); |
3c0ef626 | 331 | success = session_setup_x11fwd(s); |
332 | if (!success) { | |
333 | xfree(s->auth_proto); | |
334 | xfree(s->auth_data); | |
335 | s->auth_proto = NULL; | |
336 | s->auth_data = NULL; | |
337 | } | |
338 | break; | |
339 | ||
340 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
341 | if (no_agent_forwarding_flag || compat13) { | |
342 | debug("Authentication agent forwarding not permitted for this authentication."); | |
343 | break; | |
344 | } | |
345 | debug("Received authentication agent forwarding request."); | |
346 | success = auth_input_request_forwarding(s->pw); | |
347 | break; | |
348 | ||
349 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
350 | if (no_port_forwarding_flag) { | |
351 | debug("Port forwarding not permitted for this authentication."); | |
352 | break; | |
353 | } | |
354 | if (!options.allow_tcp_forwarding) { | |
355 | debug("Port forwarding not permitted."); | |
356 | break; | |
357 | } | |
358 | debug("Received TCP/IP port forwarding request."); | |
359 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); | |
360 | success = 1; | |
361 | break; | |
362 | ||
363 | case SSH_CMSG_MAX_PACKET_SIZE: | |
364 | if (packet_set_maxsize(packet_get_int()) > 0) | |
365 | success = 1; | |
366 | break; | |
e9a17296 | 367 | |
3c0ef626 | 368 | #if defined(AFS) || defined(KRB5) |
369 | case SSH_CMSG_HAVE_KERBEROS_TGT: | |
370 | if (!options.kerberos_tgt_passing) { | |
371 | verbose("Kerberos TGT passing disabled."); | |
372 | } else { | |
373 | char *kdata = packet_get_string(&dlen); | |
e9a17296 | 374 | packet_check_eom(); |
375 | ||
3c0ef626 | 376 | /* XXX - 0x41, see creds_to_radix version */ |
377 | if (kdata[0] != 0x41) { | |
378 | #ifdef KRB5 | |
379 | krb5_data tgt; | |
380 | tgt.data = kdata; | |
381 | tgt.length = dlen; | |
e9a17296 | 382 | |
3c0ef626 | 383 | if (auth_krb5_tgt(s->authctxt, &tgt)) |
384 | success = 1; | |
385 | else | |
386 | verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user); | |
387 | #endif /* KRB5 */ | |
388 | } else { | |
389 | #ifdef AFS | |
390 | if (auth_krb4_tgt(s->authctxt, kdata)) | |
391 | success = 1; | |
392 | else | |
393 | verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user); | |
394 | #endif /* AFS */ | |
395 | } | |
396 | xfree(kdata); | |
397 | } | |
398 | break; | |
399 | #endif /* AFS || KRB5 */ | |
e9a17296 | 400 | |
3c0ef626 | 401 | #ifdef AFS |
402 | case SSH_CMSG_HAVE_AFS_TOKEN: | |
403 | if (!options.afs_token_passing || !k_hasafs()) { | |
404 | verbose("AFS token passing disabled."); | |
405 | } else { | |
406 | /* Accept AFS token. */ | |
407 | char *token = packet_get_string(&dlen); | |
e9a17296 | 408 | packet_check_eom(); |
409 | ||
3c0ef626 | 410 | if (auth_afs_token(s->authctxt, token)) |
411 | success = 1; | |
412 | else | |
413 | verbose("AFS token refused for %.100s", | |
414 | s->authctxt->user); | |
415 | xfree(token); | |
416 | } | |
417 | break; | |
418 | #endif /* AFS */ | |
419 | ||
420 | case SSH_CMSG_EXEC_SHELL: | |
421 | case SSH_CMSG_EXEC_CMD: | |
422 | if (type == SSH_CMSG_EXEC_CMD) { | |
423 | command = packet_get_string(&dlen); | |
424 | debug("Exec command '%.500s'", command); | |
425 | do_exec(s, command); | |
426 | xfree(command); | |
427 | } else { | |
428 | do_exec(s, NULL); | |
429 | } | |
e9a17296 | 430 | packet_check_eom(); |
3c0ef626 | 431 | session_close(s); |
432 | return; | |
433 | ||
434 | default: | |
435 | /* | |
436 | * Any unknown messages in this phase are ignored, | |
437 | * and a failure message is returned. | |
438 | */ | |
439 | log("Unknown packet type received after authentication: %d", type); | |
440 | } | |
441 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
442 | packet_send(); | |
443 | packet_write_wait(); | |
444 | ||
445 | /* Enable compression now that we have replied if appropriate. */ | |
446 | if (enable_compression_after_reply) { | |
447 | enable_compression_after_reply = 0; | |
448 | packet_start_compression(compression_level); | |
449 | } | |
450 | } | |
451 | } | |
452 | ||
453 | /* | |
454 | * This is called to fork and execute a command when we have no tty. This | |
455 | * will call do_child from the child, and server_loop from the parent after | |
456 | * setting up file descriptors and such. | |
457 | */ | |
458 | void | |
459 | do_exec_no_pty(Session *s, const char *command) | |
460 | { | |
ff2d7a98 | 461 | pid_t pid; |
3c0ef626 | 462 | |
463 | #ifdef USE_PIPES | |
464 | int pin[2], pout[2], perr[2]; | |
465 | /* Allocate pipes for communicating with the program. */ | |
466 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
467 | packet_disconnect("Could not create pipes: %.100s", | |
468 | strerror(errno)); | |
469 | #else /* USE_PIPES */ | |
470 | int inout[2], err[2]; | |
471 | /* Uses socket pairs to communicate with the program. */ | |
472 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
473 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
474 | packet_disconnect("Could not create socket pairs: %.100s", | |
475 | strerror(errno)); | |
476 | #endif /* USE_PIPES */ | |
477 | if (s == NULL) | |
478 | fatal("do_exec_no_pty: no session"); | |
479 | ||
480 | session_proctitle(s); | |
481 | ||
b9a54c29 | 482 | #if defined(GSSAPI) |
483 | temporarily_use_uid(s->pw); | |
484 | ssh_gssapi_storecreds(); | |
485 | restore_uid(); | |
486 | #endif | |
487 | ||
3c0ef626 | 488 | #if defined(USE_PAM) |
489 | do_pam_session(s->pw->pw_name, NULL); | |
490 | do_pam_setcred(1); | |
491 | if (is_pam_password_change_required()) | |
492 | packet_disconnect("Password change required but no " | |
493 | "TTY available"); | |
494 | #endif /* USE_PAM */ | |
495 | ||
496 | /* Fork the child. */ | |
497 | if ((pid = fork()) == 0) { | |
e54b3d7c | 498 | fatal_remove_all_cleanups(); |
499 | ||
3c0ef626 | 500 | /* Child. Reinitialize the log since the pid has changed. */ |
501 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
502 | ||
503 | /* | |
504 | * Create a new session and process group since the 4.4BSD | |
505 | * setlogin() affects the entire process group. | |
506 | */ | |
507 | if (setsid() < 0) | |
508 | error("setsid failed: %.100s", strerror(errno)); | |
509 | ||
510 | #ifdef USE_PIPES | |
511 | /* | |
512 | * Redirect stdin. We close the parent side of the socket | |
513 | * pair, and make the child side the standard input. | |
514 | */ | |
515 | close(pin[1]); | |
516 | if (dup2(pin[0], 0) < 0) | |
517 | perror("dup2 stdin"); | |
518 | close(pin[0]); | |
519 | ||
520 | /* Redirect stdout. */ | |
521 | close(pout[0]); | |
522 | if (dup2(pout[1], 1) < 0) | |
523 | perror("dup2 stdout"); | |
524 | close(pout[1]); | |
525 | ||
526 | /* Redirect stderr. */ | |
527 | close(perr[0]); | |
528 | if (dup2(perr[1], 2) < 0) | |
529 | perror("dup2 stderr"); | |
530 | close(perr[1]); | |
531 | #else /* USE_PIPES */ | |
532 | /* | |
533 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
534 | * use the same socket, as some programs (particularly rdist) | |
535 | * seem to depend on it. | |
536 | */ | |
537 | close(inout[1]); | |
538 | close(err[1]); | |
539 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
540 | perror("dup2 stdin"); | |
541 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
542 | perror("dup2 stdout"); | |
543 | if (dup2(err[0], 2) < 0) /* stderr */ | |
544 | perror("dup2 stderr"); | |
545 | #endif /* USE_PIPES */ | |
546 | ||
e54b3d7c | 547 | #ifdef _UNICOS |
548 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
549 | #endif | |
550 | ||
3c0ef626 | 551 | /* Do processing for the child (exec command etc). */ |
552 | do_child(s, command); | |
553 | /* NOTREACHED */ | |
554 | } | |
e54b3d7c | 555 | #ifdef _UNICOS |
556 | signal(WJSIGNAL, cray_job_termination_handler); | |
557 | #endif /* _UNICOS */ | |
3c0ef626 | 558 | #ifdef HAVE_CYGWIN |
559 | if (is_winnt) | |
560 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
561 | #endif | |
562 | if (pid < 0) | |
563 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
564 | s->pid = pid; | |
565 | /* Set interactive/non-interactive mode. */ | |
566 | packet_set_interactive(s->display != NULL); | |
567 | #ifdef USE_PIPES | |
568 | /* We are the parent. Close the child sides of the pipes. */ | |
569 | close(pin[0]); | |
570 | close(pout[1]); | |
571 | close(perr[1]); | |
572 | ||
573 | if (compat20) { | |
574 | session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); | |
575 | } else { | |
576 | /* Enter the interactive session. */ | |
577 | server_loop(pid, pin[1], pout[0], perr[0]); | |
578 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ | |
579 | } | |
580 | #else /* USE_PIPES */ | |
581 | /* We are the parent. Close the child sides of the socket pairs. */ | |
582 | close(inout[0]); | |
583 | close(err[0]); | |
584 | ||
585 | /* | |
586 | * Enter the interactive session. Note: server_loop must be able to | |
587 | * handle the case that fdin and fdout are the same. | |
588 | */ | |
589 | if (compat20) { | |
590 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); | |
591 | } else { | |
592 | server_loop(pid, inout[1], inout[1], err[1]); | |
593 | /* server_loop has closed inout[1] and err[1]. */ | |
594 | } | |
595 | #endif /* USE_PIPES */ | |
596 | } | |
597 | ||
598 | /* | |
599 | * This is called to fork and execute a command when we have a tty. This | |
600 | * will call do_child from the child, and server_loop from the parent after | |
601 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
602 | * lastlog, and other such operations. | |
603 | */ | |
604 | void | |
605 | do_exec_pty(Session *s, const char *command) | |
606 | { | |
607 | int fdout, ptyfd, ttyfd, ptymaster; | |
608 | pid_t pid; | |
609 | ||
610 | if (s == NULL) | |
611 | fatal("do_exec_pty: no session"); | |
612 | ptyfd = s->ptyfd; | |
613 | ttyfd = s->ttyfd; | |
614 | ||
b9a54c29 | 615 | #if defined(GSSAPI) |
616 | temporarily_use_uid(s->pw); | |
617 | ssh_gssapi_storecreds(); | |
618 | restore_uid(); | |
619 | #endif | |
620 | ||
3c0ef626 | 621 | #if defined(USE_PAM) |
622 | do_pam_session(s->pw->pw_name, s->tty); | |
623 | do_pam_setcred(1); | |
624 | #endif | |
625 | ||
626 | /* Fork the child. */ | |
627 | if ((pid = fork()) == 0) { | |
e54b3d7c | 628 | fatal_remove_all_cleanups(); |
3c0ef626 | 629 | |
630 | /* Child. Reinitialize the log because the pid has changed. */ | |
631 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
632 | /* Close the master side of the pseudo tty. */ | |
633 | close(ptyfd); | |
634 | ||
635 | /* Make the pseudo tty our controlling tty. */ | |
636 | pty_make_controlling_tty(&ttyfd, s->tty); | |
637 | ||
638 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ | |
639 | if (dup2(ttyfd, 0) < 0) | |
640 | error("dup2 stdin: %s", strerror(errno)); | |
641 | if (dup2(ttyfd, 1) < 0) | |
642 | error("dup2 stdout: %s", strerror(errno)); | |
643 | if (dup2(ttyfd, 2) < 0) | |
644 | error("dup2 stderr: %s", strerror(errno)); | |
645 | ||
646 | /* Close the extra descriptor for the pseudo tty. */ | |
647 | close(ttyfd); | |
648 | ||
649 | /* record login, etc. similar to login(1) */ | |
650 | #ifndef HAVE_OSF_SIA | |
e54b3d7c | 651 | if (!(options.use_login && command == NULL)) { |
652 | #ifdef _UNICOS | |
653 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
654 | #endif /* _UNICOS */ | |
3c0ef626 | 655 | do_login(s, command); |
e54b3d7c | 656 | } |
3c0ef626 | 657 | # ifdef LOGIN_NEEDS_UTMPX |
658 | else | |
659 | do_pre_login(s); | |
660 | # endif | |
661 | #endif | |
662 | ||
663 | /* Do common processing for the child, such as execing the command. */ | |
664 | do_child(s, command); | |
665 | /* NOTREACHED */ | |
666 | } | |
e54b3d7c | 667 | #ifdef _UNICOS |
668 | signal(WJSIGNAL, cray_job_termination_handler); | |
669 | #endif /* _UNICOS */ | |
3c0ef626 | 670 | #ifdef HAVE_CYGWIN |
671 | if (is_winnt) | |
672 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
673 | #endif | |
674 | if (pid < 0) | |
675 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
676 | s->pid = pid; | |
677 | ||
678 | /* Parent. Close the slave side of the pseudo tty. */ | |
679 | close(ttyfd); | |
680 | ||
681 | /* | |
682 | * Create another descriptor of the pty master side for use as the | |
683 | * standard input. We could use the original descriptor, but this | |
684 | * simplifies code in server_loop. The descriptor is bidirectional. | |
685 | */ | |
686 | fdout = dup(ptyfd); | |
687 | if (fdout < 0) | |
688 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
689 | ||
690 | /* we keep a reference to the pty master */ | |
691 | ptymaster = dup(ptyfd); | |
692 | if (ptymaster < 0) | |
693 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
694 | s->ptymaster = ptymaster; | |
695 | ||
696 | /* Enter interactive session. */ | |
697 | packet_set_interactive(1); | |
698 | if (compat20) { | |
699 | session_set_fds(s, ptyfd, fdout, -1); | |
700 | } else { | |
701 | server_loop(pid, ptyfd, fdout, -1); | |
702 | /* server_loop _has_ closed ptyfd and fdout. */ | |
703 | } | |
704 | } | |
705 | ||
706 | #ifdef LOGIN_NEEDS_UTMPX | |
707 | static void | |
708 | do_pre_login(Session *s) | |
709 | { | |
710 | socklen_t fromlen; | |
711 | struct sockaddr_storage from; | |
712 | pid_t pid = getpid(); | |
713 | ||
714 | /* | |
715 | * Get IP address of client. If the connection is not a socket, let | |
716 | * the address be 0.0.0.0. | |
717 | */ | |
718 | memset(&from, 0, sizeof(from)); | |
e54b3d7c | 719 | fromlen = sizeof(from); |
3c0ef626 | 720 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 721 | if (getpeername(packet_get_connection_in(), |
e9a17296 | 722 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 723 | debug("getpeername: %.100s", strerror(errno)); |
724 | fatal_cleanup(); | |
725 | } | |
726 | } | |
727 | ||
728 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
e9a17296 | 729 | get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping), |
1c14df9e | 730 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 731 | } |
732 | #endif | |
733 | ||
734 | /* | |
735 | * This is called to fork and execute a command. If another command is | |
736 | * to be forced, execute that instead. | |
737 | */ | |
738 | void | |
739 | do_exec(Session *s, const char *command) | |
740 | { | |
88928908 | 741 | #if defined(SESSION_HOOKS) |
742 | if (options.session_hooks_allow && | |
743 | (options.session_hooks_startup_cmd || | |
744 | options.session_hooks_shutdown_cmd)) | |
745 | { | |
746 | char env_file[1000]; | |
747 | struct stat st; | |
748 | do | |
749 | { | |
750 | snprintf(env_file, | |
751 | sizeof(env_file), | |
752 | "/tmp/ssh_env_%d%d%d", | |
753 | getuid(), | |
754 | getpid(), | |
755 | rand()); | |
756 | } while (stat(env_file, &st)==0); | |
757 | s->authctxt->session_env_file = strdup(env_file); | |
758 | } | |
759 | #endif | |
3c0ef626 | 760 | if (forced_command) { |
761 | original_command = command; | |
762 | command = forced_command; | |
763 | debug("Forced command '%.900s'", command); | |
764 | } | |
765 | ||
766 | if (s->ttyfd != -1) | |
767 | do_exec_pty(s, command); | |
768 | else | |
769 | do_exec_no_pty(s, command); | |
770 | ||
771 | original_command = NULL; | |
772 | } | |
773 | ||
e9a17296 | 774 | |
3c0ef626 | 775 | /* administrative, login(1)-like work */ |
776 | void | |
777 | do_login(Session *s, const char *command) | |
778 | { | |
779 | char *time_string; | |
3c0ef626 | 780 | socklen_t fromlen; |
781 | struct sockaddr_storage from; | |
3c0ef626 | 782 | struct passwd * pw = s->pw; |
783 | pid_t pid = getpid(); | |
784 | ||
785 | /* | |
786 | * Get IP address of client. If the connection is not a socket, let | |
787 | * the address be 0.0.0.0. | |
788 | */ | |
789 | memset(&from, 0, sizeof(from)); | |
1c14df9e | 790 | fromlen = sizeof(from); |
3c0ef626 | 791 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 792 | if (getpeername(packet_get_connection_in(), |
e9a17296 | 793 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 794 | debug("getpeername: %.100s", strerror(errno)); |
795 | fatal_cleanup(); | |
796 | } | |
797 | } | |
798 | ||
3c0ef626 | 799 | /* Record that there was a login on that tty from the remote host. */ |
2980ea68 | 800 | if (!use_privsep) |
801 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
802 | get_remote_name_or_ip(utmp_len, | |
803 | options.verify_reverse_mapping), | |
e54b3d7c | 804 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 805 | |
806 | #ifdef USE_PAM | |
807 | /* | |
808 | * If password change is needed, do it now. | |
809 | * This needs to occur before the ~/.hushlogin check. | |
810 | */ | |
811 | if (is_pam_password_change_required()) { | |
812 | print_pam_messages(); | |
813 | do_pam_chauthtok(); | |
814 | } | |
815 | #endif | |
816 | ||
817 | if (check_quietlogin(s, command)) | |
818 | return; | |
819 | ||
820 | #ifdef USE_PAM | |
821 | if (!is_pam_password_change_required()) | |
822 | print_pam_messages(); | |
823 | #endif /* USE_PAM */ | |
824 | #ifdef WITH_AIXAUTHENTICATE | |
825 | if (aixloginmsg && *aixloginmsg) | |
826 | printf("%s\n", aixloginmsg); | |
827 | #endif /* WITH_AIXAUTHENTICATE */ | |
828 | ||
e54b3d7c | 829 | #ifndef NO_SSH_LASTLOG |
2980ea68 | 830 | if (options.print_lastlog && s->last_login_time != 0) { |
831 | time_string = ctime(&s->last_login_time); | |
3c0ef626 | 832 | if (strchr(time_string, '\n')) |
833 | *strchr(time_string, '\n') = 0; | |
2980ea68 | 834 | if (strcmp(s->hostname, "") == 0) |
3c0ef626 | 835 | printf("Last login: %s\r\n", time_string); |
836 | else | |
2980ea68 | 837 | printf("Last login: %s from %s\r\n", time_string, |
838 | s->hostname); | |
3c0ef626 | 839 | } |
e54b3d7c | 840 | #endif /* NO_SSH_LASTLOG */ |
3c0ef626 | 841 | |
842 | do_motd(); | |
843 | } | |
844 | ||
845 | /* | |
846 | * Display the message of the day. | |
847 | */ | |
848 | void | |
849 | do_motd(void) | |
850 | { | |
851 | FILE *f; | |
852 | char buf[256]; | |
853 | ||
854 | if (options.print_motd) { | |
855 | #ifdef HAVE_LOGIN_CAP | |
856 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
857 | "/etc/motd"), "r"); | |
858 | #else | |
859 | f = fopen("/etc/motd", "r"); | |
860 | #endif | |
861 | if (f) { | |
862 | while (fgets(buf, sizeof(buf), f)) | |
863 | fputs(buf, stdout); | |
864 | fclose(f); | |
865 | } | |
866 | } | |
867 | } | |
868 | ||
869 | ||
870 | /* | |
871 | * Check for quiet login, either .hushlogin or command given. | |
872 | */ | |
873 | int | |
874 | check_quietlogin(Session *s, const char *command) | |
875 | { | |
876 | char buf[256]; | |
877 | struct passwd *pw = s->pw; | |
878 | struct stat st; | |
879 | ||
880 | /* Return 1 if .hushlogin exists or a command given. */ | |
881 | if (command != NULL) | |
882 | return 1; | |
883 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
884 | #ifdef HAVE_LOGIN_CAP | |
885 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
886 | return 1; | |
887 | #else | |
888 | if (stat(buf, &st) >= 0) | |
889 | return 1; | |
890 | #endif | |
891 | return 0; | |
892 | } | |
893 | ||
894 | /* | |
895 | * Sets the value of the given variable in the environment. If the variable | |
896 | * already exists, its value is overriden. | |
897 | */ | |
b9a54c29 | 898 | void |
3c0ef626 | 899 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
e9a17296 | 900 | const char *value) |
3c0ef626 | 901 | { |
902 | u_int i, namelen; | |
903 | char **env; | |
904 | ||
905 | /* | |
906 | * Find the slot where the value should be stored. If the variable | |
907 | * already exists, we reuse the slot; otherwise we append a new slot | |
908 | * at the end of the array, expanding if necessary. | |
909 | */ | |
910 | env = *envp; | |
911 | namelen = strlen(name); | |
912 | for (i = 0; env[i]; i++) | |
913 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
914 | break; | |
915 | if (env[i]) { | |
916 | /* Reuse the slot. */ | |
917 | xfree(env[i]); | |
918 | } else { | |
919 | /* New variable. Expand if necessary. */ | |
920 | if (i >= (*envsizep) - 1) { | |
ff2d7a98 | 921 | if (*envsizep >= 1000) |
922 | fatal("child_set_env: too many env vars," | |
923 | " skipping: %.100s", name); | |
3c0ef626 | 924 | (*envsizep) += 50; |
925 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
926 | } | |
927 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
928 | env[i + 1] = NULL; | |
929 | } | |
930 | ||
931 | /* Allocate space and format the variable in the appropriate slot. */ | |
932 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
933 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
934 | } | |
935 | ||
936 | /* | |
937 | * Reads environment variables from the given file and adds/overrides them | |
938 | * into the environment. If the file does not exist, this does nothing. | |
939 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
940 | * and assignments of the form name=value. No other forms are allowed. | |
941 | */ | |
942 | static void | |
943 | read_environment_file(char ***env, u_int *envsize, | |
e9a17296 | 944 | const char *filename) |
3c0ef626 | 945 | { |
946 | FILE *f; | |
947 | char buf[4096]; | |
948 | char *cp, *value; | |
ff2d7a98 | 949 | u_int lineno = 0; |
3c0ef626 | 950 | |
951 | f = fopen(filename, "r"); | |
952 | if (!f) | |
953 | return; | |
954 | ||
955 | while (fgets(buf, sizeof(buf), f)) { | |
ff2d7a98 | 956 | if (++lineno > 1000) |
957 | fatal("Too many lines in environment file %s", filename); | |
3c0ef626 | 958 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
959 | ; | |
960 | if (!*cp || *cp == '#' || *cp == '\n') | |
961 | continue; | |
962 | if (strchr(cp, '\n')) | |
963 | *strchr(cp, '\n') = '\0'; | |
964 | value = strchr(cp, '='); | |
965 | if (value == NULL) { | |
ff2d7a98 | 966 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
967 | filename); | |
3c0ef626 | 968 | continue; |
969 | } | |
970 | /* | |
971 | * Replace the equals sign by nul, and advance value to | |
972 | * the value string. | |
973 | */ | |
974 | *value = '\0'; | |
975 | value++; | |
976 | child_set_env(env, envsize, cp, value); | |
977 | } | |
978 | fclose(f); | |
979 | } | |
980 | ||
88928908 | 981 | #ifdef SESSION_HOOKS |
982 | #define SSH_SESSION_ENV_FILE "SSH_SESSION_ENV_FILE" | |
983 | ||
984 | typedef enum { no_op, execute, clear_env, restore_env, | |
985 | read_env, save_or_rm_env } session_action_t; | |
986 | ||
987 | static session_action_t action_order[2][5] = { | |
988 | { clear_env, read_env, execute, save_or_rm_env, restore_env }, /*shutdown*/ | |
989 | { execute, read_env, save_or_rm_env, no_op, no_op } /*startup */ | |
990 | }; | |
991 | ||
992 | static | |
993 | void execute_session_hook(char* prog, Authctxt *authctxt, | |
994 | int startup, int save) | |
995 | { | |
996 | extern char **environ; | |
997 | ||
998 | struct stat st; | |
999 | char **saved_env, **tmpenv; | |
1000 | char *env_file = authctxt->session_env_file; | |
1001 | int i, status = 0; | |
1002 | ||
1003 | for (i=0; i<5; i++) | |
1004 | { | |
1005 | switch (action_order[startup][i]) | |
1006 | { | |
1007 | case no_op: | |
1008 | break; | |
1009 | ||
1010 | case execute: | |
1011 | { | |
1012 | FILE* fp; | |
1013 | char buf[1000]; | |
1014 | ||
1015 | snprintf(buf, | |
1016 | sizeof(buf), | |
1017 | "%s -c '%s'", | |
1018 | authctxt->pw->pw_shell, | |
1019 | prog); | |
1020 | ||
1021 | debug("executing session hook: [%s]", buf); | |
1022 | setenv(SSH_SESSION_ENV_FILE, env_file, /* overwrite = */ 1); | |
1023 | ||
1024 | /* flusing is recommended in the popen(3) man page, to avoid | |
1025 | intermingling of output */ | |
1026 | fflush(stdout); | |
1027 | fflush(stderr); | |
1028 | if ((fp=popen(buf, "w")) == NULL) | |
1029 | { | |
1030 | perror("Unable to run session hook"); | |
1031 | return; | |
1032 | } | |
1033 | status = pclose(fp); | |
1034 | debug2("session hook executed, status=%d", status); | |
1035 | unsetenv(SSH_SESSION_ENV_FILE); | |
1036 | } | |
1037 | break; | |
1038 | ||
1039 | case clear_env: | |
1040 | saved_env = environ; | |
1041 | tmpenv = (char**) malloc(sizeof(char*)); | |
1042 | tmpenv[0] = NULL; | |
1043 | environ = tmpenv; | |
1044 | break; | |
1045 | ||
1046 | case restore_env: | |
1047 | environ = saved_env; | |
1048 | free(tmpenv); | |
1049 | break; | |
1050 | ||
1051 | case read_env: | |
1052 | if (status==0 && stat(env_file, &st)==0) | |
1053 | { | |
1054 | int envsize = 0; | |
1055 | ||
1056 | debug("reading environment from %s", env_file); | |
1057 | while (environ[envsize++]) ; | |
1058 | read_environment_file(&environ, &envsize, env_file); | |
1059 | } | |
1060 | break; | |
1061 | ||
1062 | case save_or_rm_env: | |
1063 | if (status==0 && save) | |
1064 | { | |
1065 | FILE* fp; | |
1066 | int envcount=0; | |
1067 | ||
1068 | debug2("saving environment to %s", env_file); | |
1069 | if ((fp = fopen(env_file, "w")) == NULL) /* hmm: file perms? */ | |
1070 | { | |
1071 | perror("Unable to save session hook info"); | |
1072 | } | |
1073 | while (environ[envcount]) | |
1074 | { | |
1075 | fprintf(fp, "%s\n", environ[envcount++]); | |
1076 | } | |
1077 | fflush(fp); | |
1078 | fclose(fp); | |
1079 | } | |
1080 | else if (stat(env_file, &st)==0) | |
1081 | { | |
1082 | debug2("removing environment file %s", env_file); | |
1083 | remove(env_file); | |
1084 | } | |
1085 | break; | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | } | |
1090 | #endif | |
1091 | ||
e9a17296 | 1092 | void copy_environment(char **source, char ***env, u_int *envsize) |
3c0ef626 | 1093 | { |
e9a17296 | 1094 | char *var_name, *var_val; |
3c0ef626 | 1095 | int i; |
1096 | ||
e9a17296 | 1097 | if (source == NULL) |
3c0ef626 | 1098 | return; |
1099 | ||
e9a17296 | 1100 | for(i = 0; source[i] != NULL; i++) { |
1101 | var_name = xstrdup(source[i]); | |
1102 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
1103 | xfree(var_name); | |
3c0ef626 | 1104 | continue; |
3c0ef626 | 1105 | } |
e9a17296 | 1106 | *var_val++ = '\0'; |
3c0ef626 | 1107 | |
e9a17296 | 1108 | debug3("Copy environment: %s=%s", var_name, var_val); |
1109 | child_set_env(env, envsize, var_name, var_val); | |
1110 | ||
1111 | xfree(var_name); | |
3c0ef626 | 1112 | } |
1113 | } | |
3c0ef626 | 1114 | |
e9a17296 | 1115 | static char ** |
1116 | do_setup_env(Session *s, const char *shell) | |
3c0ef626 | 1117 | { |
3c0ef626 | 1118 | char buf[256]; |
e9a17296 | 1119 | u_int i, envsize; |
1c14df9e | 1120 | char **env, *laddr; |
e9a17296 | 1121 | struct passwd *pw = s->pw; |
3c0ef626 | 1122 | |
1123 | /* Initialize the environment. */ | |
1124 | envsize = 100; | |
1125 | env = xmalloc(envsize * sizeof(char *)); | |
1126 | env[0] = NULL; | |
1127 | ||
1128 | #ifdef HAVE_CYGWIN | |
1129 | /* | |
1130 | * The Windows environment contains some setting which are | |
1131 | * important for a running system. They must not be dropped. | |
1132 | */ | |
e9a17296 | 1133 | copy_environment(environ, &env, &envsize); |
3c0ef626 | 1134 | #endif |
1135 | ||
b9a54c29 | 1136 | #ifdef GSSAPI |
1137 | /* Allow any GSSAPI methods that we've used to alter | |
1138 | * the childs environment as they see fit | |
1139 | */ | |
1140 | ssh_gssapi_do_child(&env,&envsize); | |
1141 | #endif | |
1142 | ||
3c0ef626 | 1143 | if (!options.use_login) { |
1144 | /* Set basic environment. */ | |
1145 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1146 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1c14df9e | 1147 | #ifdef _AIX |
1148 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1149 | #endif | |
3c0ef626 | 1150 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
1151 | #ifdef HAVE_LOGIN_CAP | |
e54b3d7c | 1152 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1153 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1154 | else | |
1155 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
3c0ef626 | 1156 | #else /* HAVE_LOGIN_CAP */ |
1157 | # ifndef HAVE_CYGWIN | |
1158 | /* | |
1159 | * There's no standard path on Windows. The path contains | |
1160 | * important components pointing to the system directories, | |
1161 | * needed for loading shared libraries. So the path better | |
1162 | * remains intact here. | |
1163 | */ | |
2980ea68 | 1164 | # ifdef SUPERUSER_PATH |
1165 | child_set_env(&env, &envsize, "PATH", | |
1166 | s->pw->pw_uid == 0 ? SUPERUSER_PATH : | |
1167 | _PATH_STDPATH_WITH_SCP); | |
1168 | # else | |
4a23e2c2 | 1169 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH_WITH_SCP); |
2980ea68 | 1170 | # endif /* SUPERUSER_PATH */ |
3c0ef626 | 1171 | # endif /* HAVE_CYGWIN */ |
1172 | #endif /* HAVE_LOGIN_CAP */ | |
1173 | ||
1174 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1175 | _PATH_MAILDIR, pw->pw_name); | |
1176 | child_set_env(&env, &envsize, "MAIL", buf); | |
1177 | ||
1178 | /* Normal systems set SHELL by default. */ | |
1179 | child_set_env(&env, &envsize, "SHELL", shell); | |
1180 | } | |
1181 | if (getenv("TZ")) | |
1182 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1183 | ||
93f82cab | 1184 | #ifdef GSI |
1185 | if (getenv("GLOBUS_LOCATION")) | |
1186 | child_set_env(&env, &envsize, "GLOBUS_LOCATION", | |
1187 | getenv("GLOBUS_LOCATION")); | |
1188 | #endif | |
1189 | ||
3c0ef626 | 1190 | /* Set custom environment options from RSA authentication. */ |
1191 | if (!options.use_login) { | |
1192 | while (custom_environment) { | |
1193 | struct envstring *ce = custom_environment; | |
e54b3d7c | 1194 | char *str = ce->s; |
e9a17296 | 1195 | |
e54b3d7c | 1196 | for (i = 0; str[i] != '=' && str[i]; i++) |
3c0ef626 | 1197 | ; |
e54b3d7c | 1198 | if (str[i] == '=') { |
1199 | str[i] = 0; | |
1200 | child_set_env(&env, &envsize, str, str + i + 1); | |
3c0ef626 | 1201 | } |
1202 | custom_environment = ce->next; | |
1203 | xfree(ce->s); | |
1204 | xfree(ce); | |
1205 | } | |
1206 | } | |
1207 | ||
e54b3d7c | 1208 | /* SSH_CLIENT deprecated */ |
3c0ef626 | 1209 | snprintf(buf, sizeof buf, "%.50s %d %d", |
e9a17296 | 1210 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
3c0ef626 | 1211 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1212 | ||
1c14df9e | 1213 | laddr = get_local_ipaddr(packet_get_connection_in()); |
e54b3d7c | 1214 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
1c14df9e | 1215 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1216 | xfree(laddr); | |
e54b3d7c | 1217 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1218 | ||
3c0ef626 | 1219 | if (s->ttyfd != -1) |
1220 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1221 | if (s->term) | |
1222 | child_set_env(&env, &envsize, "TERM", s->term); | |
1223 | if (s->display) | |
1224 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
1225 | if (original_command) | |
1226 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1227 | original_command); | |
1228 | ||
e54b3d7c | 1229 | #ifdef _UNICOS |
1230 | if (cray_tmpdir[0] != '\0') | |
1231 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1232 | #endif /* _UNICOS */ | |
1233 | ||
3c0ef626 | 1234 | #ifdef _AIX |
e9a17296 | 1235 | { |
1236 | char *cp; | |
1237 | ||
1238 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1239 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1240 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1241 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1242 | read_environment_file(&env, &envsize, "/etc/environment"); | |
1243 | } | |
3c0ef626 | 1244 | #endif |
1245 | #ifdef KRB4 | |
1246 | if (s->authctxt->krb4_ticket_file) | |
1247 | child_set_env(&env, &envsize, "KRBTKFILE", | |
1248 | s->authctxt->krb4_ticket_file); | |
1249 | #endif | |
1250 | #ifdef KRB5 | |
1251 | if (s->authctxt->krb5_ticket_file) | |
1252 | child_set_env(&env, &envsize, "KRB5CCNAME", | |
1253 | s->authctxt->krb5_ticket_file); | |
1254 | #endif | |
1255 | #ifdef USE_PAM | |
e54b3d7c | 1256 | /* |
1257 | * Pull in any environment variables that may have | |
1258 | * been set by PAM. | |
1259 | */ | |
1260 | { | |
1261 | char **p; | |
1262 | ||
1263 | p = fetch_pam_environment(); | |
1264 | copy_environment(p, &env, &envsize); | |
1265 | free_pam_environment(p); | |
1266 | } | |
3c0ef626 | 1267 | #endif /* USE_PAM */ |
1268 | ||
ff2d7a98 | 1269 | if (auth_sock_name != NULL) |
3c0ef626 | 1270 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
ff2d7a98 | 1271 | auth_sock_name); |
3c0ef626 | 1272 | |
1273 | /* read $HOME/.ssh/environment. */ | |
e54b3d7c | 1274 | if (options.permit_user_env && !options.use_login) { |
3c0ef626 | 1275 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e54b3d7c | 1276 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
3c0ef626 | 1277 | read_environment_file(&env, &envsize, buf); |
1278 | } | |
1279 | if (debug_flag) { | |
1280 | /* dump the environment */ | |
1281 | fprintf(stderr, "Environment:\n"); | |
1282 | for (i = 0; env[i]; i++) | |
1283 | fprintf(stderr, " %.200s\n", env[i]); | |
1284 | } | |
e9a17296 | 1285 | return env; |
1286 | } | |
1287 | ||
1288 | /* | |
1289 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1290 | * first in this order). | |
1291 | */ | |
1292 | static void | |
1293 | do_rc_files(Session *s, const char *shell) | |
1294 | { | |
1295 | FILE *f = NULL; | |
1296 | char cmd[1024]; | |
1297 | int do_xauth; | |
1298 | struct stat st; | |
1299 | ||
1300 | do_xauth = | |
1301 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1302 | ||
1303 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1304 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1305 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1306 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1307 | if (debug_flag) | |
1308 | fprintf(stderr, "Running %s\n", cmd); | |
1309 | f = popen(cmd, "w"); | |
1310 | if (f) { | |
1311 | if (do_xauth) | |
1312 | fprintf(f, "%s %s\n", s->auth_proto, | |
1313 | s->auth_data); | |
1314 | pclose(f); | |
1315 | } else | |
1316 | fprintf(stderr, "Could not run %s\n", | |
1317 | _PATH_SSH_USER_RC); | |
1318 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
ae43c103 | 1319 | snprintf(cmd, sizeof cmd, "%s %s", _PATH_BSHELL, |
1320 | _PATH_SSH_SYSTEM_RC); | |
e9a17296 | 1321 | if (debug_flag) |
ae43c103 | 1322 | fprintf(stderr, "Running %s\n", cmd); |
1323 | f = popen(cmd, "w"); | |
e9a17296 | 1324 | if (f) { |
1325 | if (do_xauth) | |
1326 | fprintf(f, "%s %s\n", s->auth_proto, | |
1327 | s->auth_data); | |
1328 | pclose(f); | |
1329 | } else | |
1330 | fprintf(stderr, "Could not run %s\n", | |
1331 | _PATH_SSH_SYSTEM_RC); | |
1332 | } else if (do_xauth && options.xauth_location != NULL) { | |
1333 | /* Add authority data to .Xauthority if appropriate. */ | |
1334 | if (debug_flag) { | |
1335 | fprintf(stderr, | |
1c14df9e | 1336 | "Running %.500s remove %.100s\n", |
1337 | options.xauth_location, s->auth_display); | |
1338 | fprintf(stderr, | |
1339 | "%.500s add %.100s %.100s %.100s\n", | |
e9a17296 | 1340 | options.xauth_location, s->auth_display, |
1341 | s->auth_proto, s->auth_data); | |
1342 | } | |
1343 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1344 | options.xauth_location); | |
1345 | f = popen(cmd, "w"); | |
1346 | if (f) { | |
1c14df9e | 1347 | fprintf(f, "remove %s\n", |
1348 | s->auth_display); | |
e9a17296 | 1349 | fprintf(f, "add %s %s %s\n", |
1350 | s->auth_display, s->auth_proto, | |
1351 | s->auth_data); | |
1352 | pclose(f); | |
1353 | } else { | |
1354 | fprintf(stderr, "Could not run %s\n", | |
1355 | cmd); | |
1356 | } | |
1357 | } | |
1358 | } | |
1359 | ||
1360 | static void | |
1361 | do_nologin(struct passwd *pw) | |
1362 | { | |
1363 | FILE *f = NULL; | |
1364 | char buf[1024]; | |
1365 | ||
1366 | #ifdef HAVE_LOGIN_CAP | |
1367 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1368 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1369 | _PATH_NOLOGIN), "r"); | |
1370 | #else | |
1371 | if (pw->pw_uid) | |
1372 | f = fopen(_PATH_NOLOGIN, "r"); | |
1373 | #endif | |
1374 | if (f) { | |
1375 | /* /etc/nologin exists. Print its contents and exit. */ | |
e54b3d7c | 1376 | log("User %.100s not allowed because %s exists", |
1377 | pw->pw_name, _PATH_NOLOGIN); | |
e9a17296 | 1378 | while (fgets(buf, sizeof(buf), f)) |
1379 | fputs(buf, stderr); | |
1380 | fclose(f); | |
1c14df9e | 1381 | fflush(NULL); |
e9a17296 | 1382 | exit(254); |
1383 | } | |
1384 | } | |
1385 | ||
1386 | /* Set login name, uid, gid, and groups. */ | |
2980ea68 | 1387 | void |
e9a17296 | 1388 | do_setusercontext(struct passwd *pw) |
1389 | { | |
1c14df9e | 1390 | #ifndef HAVE_CYGWIN |
1391 | if (getuid() == 0 || geteuid() == 0) | |
e9a17296 | 1392 | #endif /* HAVE_CYGWIN */ |
1c14df9e | 1393 | { |
1394 | ||
ff2d7a98 | 1395 | #ifdef HAVE_SETPCRED |
1396 | setpcred(pw->pw_name); | |
1397 | #endif /* HAVE_SETPCRED */ | |
e9a17296 | 1398 | #ifdef HAVE_LOGIN_CAP |
e54b3d7c | 1399 | # ifdef __bsdi__ |
ff2d7a98 | 1400 | setpgid(0, 0); |
e54b3d7c | 1401 | # endif |
e9a17296 | 1402 | if (setusercontext(lc, pw, pw->pw_uid, |
1403 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1404 | perror("unable to set user context"); | |
1405 | exit(1); | |
1406 | } | |
1407 | #else | |
1408 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1409 | /* Sets login uid for accounting */ | |
1410 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1411 | error("setluid: %s", strerror(errno)); | |
1412 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1413 | ||
1414 | if (setlogin(pw->pw_name) < 0) | |
1415 | error("setlogin failed: %s", strerror(errno)); | |
1416 | if (setgid(pw->pw_gid) < 0) { | |
1417 | perror("setgid"); | |
1418 | exit(1); | |
1419 | } | |
1420 | /* Initialize the group list. */ | |
1421 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1422 | perror("initgroups"); | |
1423 | exit(1); | |
1424 | } | |
1425 | endgrent(); | |
1426 | # ifdef USE_PAM | |
1427 | /* | |
1428 | * PAM credentials may take the form of supplementary groups. | |
1429 | * These will have been wiped by the above initgroups() call. | |
1430 | * Reestablish them here. | |
1431 | */ | |
1432 | do_pam_setcred(0); | |
1433 | # endif /* USE_PAM */ | |
1434 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1435 | irix_setusercontext(pw); | |
1436 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
ff2d7a98 | 1437 | # ifdef _AIX |
e54b3d7c | 1438 | aix_usrinfo(pw); |
ff2d7a98 | 1439 | # endif /* _AIX */ |
e9a17296 | 1440 | /* Permanently switch to the desired uid. */ |
1441 | permanently_set_uid(pw); | |
1442 | #endif | |
1443 | } | |
1c14df9e | 1444 | |
1445 | #ifdef HAVE_CYGWIN | |
1446 | if (is_winnt) | |
1447 | #endif | |
e9a17296 | 1448 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1449 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1450 | } | |
1451 | ||
2980ea68 | 1452 | static void |
1453 | launch_login(struct passwd *pw, const char *hostname) | |
1454 | { | |
1455 | /* Launch login(1). */ | |
1456 | ||
ff2d7a98 | 1457 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
2980ea68 | 1458 | #ifdef xxxLOGIN_NEEDS_TERM |
ff2d7a98 | 1459 | (s->term ? s->term : "unknown"), |
2980ea68 | 1460 | #endif /* LOGIN_NEEDS_TERM */ |
1461 | #ifdef LOGIN_NO_ENDOPT | |
1462 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1463 | #else | |
1464 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1465 | #endif | |
1466 | ||
1467 | /* Login couldn't be executed, die. */ | |
1468 | ||
1469 | perror("login"); | |
1470 | exit(1); | |
1471 | } | |
1472 | ||
e9a17296 | 1473 | /* |
1474 | * Performs common processing for the child, such as setting up the | |
1475 | * environment, closing extra file descriptors, setting the user and group | |
1476 | * ids, and executing the command or shell. | |
1477 | */ | |
1478 | void | |
1479 | do_child(Session *s, const char *command) | |
1480 | { | |
1481 | extern char **environ; | |
1482 | char **env; | |
1483 | char *argv[10]; | |
1484 | const char *shell, *shell0, *hostname = NULL; | |
1485 | struct passwd *pw = s->pw; | |
1486 | u_int i; | |
1487 | ||
f2fd21a2 | 1488 | #ifdef AFS_KRB5 |
1489 | /* Default place to look for aklog. */ | |
1490 | #ifdef AKLOG_PATH | |
1491 | #define KPROGDIR AKLOG_PATH | |
1492 | #else | |
1493 | #define KPROGDIR "/usr/bin/aklog" | |
1494 | #endif /* AKLOG_PATH */ | |
1495 | ||
1496 | struct stat st; | |
1497 | char *aklog_path; | |
1498 | #endif /* AFS_KRB5 */ | |
1499 | ||
e9a17296 | 1500 | /* remove hostkey from the child's memory */ |
1501 | destroy_sensitive_data(); | |
1502 | ||
1503 | /* login(1) is only called if we execute the login shell */ | |
1504 | if (options.use_login && command != NULL) | |
1505 | options.use_login = 0; | |
1506 | ||
e54b3d7c | 1507 | #ifdef _UNICOS |
1508 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1509 | #endif /* _UNICOS */ | |
1510 | ||
e9a17296 | 1511 | /* |
1512 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1513 | * switch, so we let login(1) to this for us. | |
1514 | */ | |
1515 | if (!options.use_login) { | |
1516 | #ifdef HAVE_OSF_SIA | |
1c14df9e | 1517 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
e9a17296 | 1518 | if (!check_quietlogin(s, command)) |
1519 | do_motd(); | |
1520 | #else /* HAVE_OSF_SIA */ | |
1521 | do_nologin(pw); | |
e9a17296 | 1522 | do_setusercontext(pw); |
1523 | #endif /* HAVE_OSF_SIA */ | |
1524 | } | |
1525 | ||
1526 | /* | |
1527 | * Get the shell from the password data. An empty shell field is | |
1528 | * legal, and means /bin/sh. | |
1529 | */ | |
1530 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
1c14df9e | 1531 | |
1532 | /* | |
1533 | * Make sure $SHELL points to the shell from the password file, | |
1534 | * even if shell is overridden from login.conf | |
1535 | */ | |
1536 | env = do_setup_env(s, shell); | |
1537 | ||
e9a17296 | 1538 | #ifdef HAVE_LOGIN_CAP |
1539 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1540 | #endif | |
1541 | ||
3c0ef626 | 1542 | /* we have to stash the hostname before we close our socket. */ |
1543 | if (options.use_login) | |
1544 | hostname = get_remote_name_or_ip(utmp_len, | |
e9a17296 | 1545 | options.verify_reverse_mapping); |
3c0ef626 | 1546 | /* |
1547 | * Close the connection descriptors; note that this is the child, and | |
1548 | * the server will still have the socket open, and it is important | |
1549 | * that we do not shutdown it. Note that the descriptors cannot be | |
1550 | * closed before building the environment, as we call | |
1551 | * get_remote_ipaddr there. | |
1552 | */ | |
1553 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1554 | close(packet_get_connection_in()); | |
1555 | else { | |
1556 | close(packet_get_connection_in()); | |
1557 | close(packet_get_connection_out()); | |
1558 | } | |
1559 | /* | |
1560 | * Close all descriptors related to channels. They will still remain | |
1561 | * open in the parent. | |
1562 | */ | |
1563 | /* XXX better use close-on-exec? -markus */ | |
1564 | channel_close_all(); | |
1565 | ||
1566 | /* | |
1567 | * Close any extra file descriptors. Note that there may still be | |
1568 | * descriptors left by system functions. They will be closed later. | |
1569 | */ | |
1570 | endpwent(); | |
1571 | ||
1572 | /* | |
1573 | * Close any extra open file descriptors so that we don\'t have them | |
1574 | * hanging around in clients. Note that we want to do this after | |
1575 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1576 | * descriptors open. | |
1577 | */ | |
1578 | for (i = 3; i < 64; i++) | |
1579 | close(i); | |
1580 | ||
1581 | /* | |
e9a17296 | 1582 | * Must take new environment into use so that .ssh/rc, |
1583 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
3c0ef626 | 1584 | */ |
1585 | environ = env; | |
1586 | ||
f2fd21a2 | 1587 | #ifdef AFS_KRB5 |
1588 | ||
1589 | /* User has authenticated, and if a ticket was going to be | |
1590 | * passed we would have it. KRB5CCNAME should already be set. | |
1591 | * Now try to get an AFS token using aklog. | |
1592 | */ | |
1593 | if (k_hasafs()) { /* Do we have AFS? */ | |
1594 | ||
1595 | aklog_path = xstrdup(KPROGDIR); | |
1596 | ||
1597 | /* | |
1598 | * Make sure it exists before we try to run it | |
1599 | */ | |
1600 | if (stat(aklog_path, &st) == 0) { | |
1601 | debug("Running %s to get afs token.",aklog_path); | |
1602 | system(aklog_path); | |
1603 | } else { | |
1604 | debug("%s does not exist.",aklog_path); | |
1605 | } | |
1606 | ||
1607 | xfree(aklog_path); | |
1608 | } | |
1609 | #endif /* AFS_KRB5 */ | |
1610 | ||
88928908 | 1611 | #ifdef SESSION_HOOKS |
1612 | if (options.session_hooks_allow && | |
1613 | options.session_hooks_startup_cmd) | |
1614 | { | |
1615 | execute_session_hook(options.session_hooks_startup_cmd, | |
1616 | s->authctxt, | |
1617 | /* startup = */ 1, | |
1618 | options.session_hooks_shutdown_cmd != NULL); | |
1619 | } | |
1620 | #endif | |
3c0ef626 | 1621 | #ifdef AFS |
1622 | /* Try to get AFS tokens for the local cell. */ | |
1623 | if (k_hasafs()) { | |
1624 | char cell[64]; | |
e9a17296 | 1625 | |
3c0ef626 | 1626 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) |
1627 | krb_afslog(cell, 0); | |
e9a17296 | 1628 | |
3c0ef626 | 1629 | krb_afslog(0, 0); |
1630 | } | |
1631 | #endif /* AFS */ | |
1632 | ||
1633 | /* Change current directory to the user\'s home directory. */ | |
1634 | if (chdir(pw->pw_dir) < 0) { | |
1635 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1636 | pw->pw_dir, strerror(errno)); | |
1637 | #ifdef HAVE_LOGIN_CAP | |
1638 | if (login_getcapbool(lc, "requirehome", 0)) | |
1639 | exit(1); | |
1640 | #endif | |
1641 | } | |
1642 | ||
e9a17296 | 1643 | if (!options.use_login) |
1644 | do_rc_files(s, shell); | |
3c0ef626 | 1645 | |
1646 | /* restore SIGPIPE for child */ | |
1647 | signal(SIGPIPE, SIG_DFL); | |
1648 | ||
e9a17296 | 1649 | if (options.use_login) { |
2980ea68 | 1650 | launch_login(pw, hostname); |
1651 | /* NEVERREACHED */ | |
e9a17296 | 1652 | } |
1653 | ||
1654 | /* Get the last component of the shell name. */ | |
1655 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1656 | shell0++; | |
1657 | else | |
1658 | shell0 = shell; | |
1659 | ||
3c0ef626 | 1660 | /* |
1661 | * If we have no command, execute the shell. In this case, the shell | |
1662 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1663 | * this is a login shell. | |
1664 | */ | |
1665 | if (!command) { | |
e9a17296 | 1666 | char argv0[256]; |
3c0ef626 | 1667 | |
e9a17296 | 1668 | /* Start the shell. Set initial character to '-'. */ |
1669 | argv0[0] = '-'; | |
3c0ef626 | 1670 | |
e9a17296 | 1671 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1672 | >= sizeof(argv0) - 1) { | |
1673 | errno = EINVAL; | |
3c0ef626 | 1674 | perror(shell); |
1675 | exit(1); | |
e9a17296 | 1676 | } |
3c0ef626 | 1677 | |
e9a17296 | 1678 | /* Execute the shell. */ |
1679 | argv[0] = argv0; | |
1680 | argv[1] = NULL; | |
14f24c32 | 1681 | execve(shell, argv, env); |
3c0ef626 | 1682 | |
e9a17296 | 1683 | /* Executing the shell failed. */ |
1684 | perror(shell); | |
1685 | exit(1); | |
3c0ef626 | 1686 | } |
1687 | /* | |
1688 | * Execute the command using the user's shell. This uses the -c | |
1689 | * option to execute the command. | |
1690 | */ | |
e9a17296 | 1691 | argv[0] = (char *) shell0; |
3c0ef626 | 1692 | argv[1] = "-c"; |
1693 | argv[2] = (char *) command; | |
1694 | argv[3] = NULL; | |
14f24c32 | 1695 | execve(shell, argv, env); |
3c0ef626 | 1696 | perror(shell); |
1697 | exit(1); | |
1698 | } | |
1699 | ||
1700 | Session * | |
1701 | session_new(void) | |
1702 | { | |
1703 | int i; | |
1704 | static int did_init = 0; | |
1705 | if (!did_init) { | |
1706 | debug("session_new: init"); | |
e9a17296 | 1707 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1708 | sessions[i].used = 0; |
1709 | } | |
1710 | did_init = 1; | |
1711 | } | |
e9a17296 | 1712 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1713 | Session *s = &sessions[i]; |
1714 | if (! s->used) { | |
1715 | memset(s, 0, sizeof(*s)); | |
1716 | s->chanid = -1; | |
1717 | s->ptyfd = -1; | |
1718 | s->ttyfd = -1; | |
1719 | s->used = 1; | |
1720 | s->self = i; | |
1721 | debug("session_new: session %d", i); | |
1722 | return s; | |
1723 | } | |
1724 | } | |
1725 | return NULL; | |
1726 | } | |
1727 | ||
1728 | static void | |
1729 | session_dump(void) | |
1730 | { | |
1731 | int i; | |
e9a17296 | 1732 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1733 | Session *s = &sessions[i]; |
ff2d7a98 | 1734 | debug("dump: used %d session %d %p channel %d pid %ld", |
3c0ef626 | 1735 | s->used, |
1736 | s->self, | |
1737 | s, | |
1738 | s->chanid, | |
ff2d7a98 | 1739 | (long)s->pid); |
3c0ef626 | 1740 | } |
1741 | } | |
1742 | ||
1743 | int | |
1744 | session_open(Authctxt *authctxt, int chanid) | |
1745 | { | |
1746 | Session *s = session_new(); | |
1747 | debug("session_open: channel %d", chanid); | |
1748 | if (s == NULL) { | |
1749 | error("no more sessions"); | |
1750 | return 0; | |
1751 | } | |
1752 | s->authctxt = authctxt; | |
1753 | s->pw = authctxt->pw; | |
1754 | if (s->pw == NULL) | |
1755 | fatal("no user for session %d", s->self); | |
1756 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1757 | s->chanid = chanid; | |
1758 | return 1; | |
1759 | } | |
1760 | ||
2980ea68 | 1761 | Session * |
1762 | session_by_tty(char *tty) | |
1763 | { | |
1764 | int i; | |
1765 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1766 | Session *s = &sessions[i]; | |
1767 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1768 | debug("session_by_tty: session %d tty %s", i, tty); | |
1769 | return s; | |
1770 | } | |
1771 | } | |
1772 | debug("session_by_tty: unknown tty %.100s", tty); | |
1773 | session_dump(); | |
1774 | return NULL; | |
1775 | } | |
1776 | ||
3c0ef626 | 1777 | static Session * |
1778 | session_by_channel(int id) | |
1779 | { | |
1780 | int i; | |
e9a17296 | 1781 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1782 | Session *s = &sessions[i]; |
1783 | if (s->used && s->chanid == id) { | |
1784 | debug("session_by_channel: session %d channel %d", i, id); | |
1785 | return s; | |
1786 | } | |
1787 | } | |
1788 | debug("session_by_channel: unknown channel %d", id); | |
1789 | session_dump(); | |
1790 | return NULL; | |
1791 | } | |
1792 | ||
1793 | static Session * | |
1794 | session_by_pid(pid_t pid) | |
1795 | { | |
1796 | int i; | |
ff2d7a98 | 1797 | debug("session_by_pid: pid %ld", (long)pid); |
e9a17296 | 1798 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1799 | Session *s = &sessions[i]; |
1800 | if (s->used && s->pid == pid) | |
1801 | return s; | |
1802 | } | |
ff2d7a98 | 1803 | error("session_by_pid: unknown pid %ld", (long)pid); |
3c0ef626 | 1804 | session_dump(); |
1805 | return NULL; | |
1806 | } | |
1807 | ||
1808 | static int | |
1809 | session_window_change_req(Session *s) | |
1810 | { | |
1811 | s->col = packet_get_int(); | |
1812 | s->row = packet_get_int(); | |
1813 | s->xpixel = packet_get_int(); | |
1814 | s->ypixel = packet_get_int(); | |
e9a17296 | 1815 | packet_check_eom(); |
3c0ef626 | 1816 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1817 | return 1; | |
1818 | } | |
1819 | ||
1820 | static int | |
1821 | session_pty_req(Session *s) | |
1822 | { | |
1823 | u_int len; | |
1824 | int n_bytes; | |
1825 | ||
1826 | if (no_pty_flag) { | |
1827 | debug("Allocating a pty not permitted for this authentication."); | |
1828 | return 0; | |
1829 | } | |
1830 | if (s->ttyfd != -1) { | |
1831 | packet_disconnect("Protocol error: you already have a pty."); | |
1832 | return 0; | |
1833 | } | |
2980ea68 | 1834 | /* Get the time and hostname when the user last logged in. */ |
1835 | if (options.print_lastlog) { | |
1836 | s->hostname[0] = '\0'; | |
1837 | s->last_login_time = get_last_login_time(s->pw->pw_uid, | |
1838 | s->pw->pw_name, s->hostname, sizeof(s->hostname)); | |
1839 | } | |
3c0ef626 | 1840 | |
1841 | s->term = packet_get_string(&len); | |
1842 | ||
1843 | if (compat20) { | |
1844 | s->col = packet_get_int(); | |
1845 | s->row = packet_get_int(); | |
1846 | } else { | |
1847 | s->row = packet_get_int(); | |
1848 | s->col = packet_get_int(); | |
1849 | } | |
1850 | s->xpixel = packet_get_int(); | |
1851 | s->ypixel = packet_get_int(); | |
1852 | ||
1853 | if (strcmp(s->term, "") == 0) { | |
1854 | xfree(s->term); | |
1855 | s->term = NULL; | |
1856 | } | |
1857 | ||
1858 | /* Allocate a pty and open it. */ | |
1859 | debug("Allocating pty."); | |
2980ea68 | 1860 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
3c0ef626 | 1861 | if (s->term) |
1862 | xfree(s->term); | |
1863 | s->term = NULL; | |
1864 | s->ptyfd = -1; | |
1865 | s->ttyfd = -1; | |
1866 | error("session_pty_req: session %d alloc failed", s->self); | |
1867 | return 0; | |
1868 | } | |
1869 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1870 | ||
1871 | /* for SSH1 the tty modes length is not given */ | |
1872 | if (!compat20) | |
1873 | n_bytes = packet_remaining(); | |
1874 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1875 | ||
1876 | /* | |
1877 | * Add a cleanup function to clear the utmp entry and record logout | |
1878 | * time in case we call fatal() (e.g., the connection gets closed). | |
1879 | */ | |
1880 | fatal_add_cleanup(session_pty_cleanup, (void *)s); | |
2980ea68 | 1881 | if (!use_privsep) |
1882 | pty_setowner(s->pw, s->tty); | |
3c0ef626 | 1883 | |
1884 | /* Set window size from the packet. */ | |
1885 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1886 | ||
e9a17296 | 1887 | packet_check_eom(); |
3c0ef626 | 1888 | session_proctitle(s); |
1889 | return 1; | |
1890 | } | |
1891 | ||
1892 | static int | |
1893 | session_subsystem_req(Session *s) | |
1894 | { | |
1895 | struct stat st; | |
1896 | u_int len; | |
1897 | int success = 0; | |
1898 | char *cmd, *subsys = packet_get_string(&len); | |
1899 | int i; | |
1900 | ||
e9a17296 | 1901 | packet_check_eom(); |
1902 | log("subsystem request for %.100s", subsys); | |
3c0ef626 | 1903 | |
1904 | for (i = 0; i < options.num_subsystems; i++) { | |
1905 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1906 | cmd = options.subsystem_command[i]; | |
1907 | if (stat(cmd, &st) < 0) { | |
1908 | error("subsystem: cannot stat %s: %s", cmd, | |
1909 | strerror(errno)); | |
1910 | break; | |
1911 | } | |
1912 | debug("subsystem: exec() %s", cmd); | |
1913 | s->is_subsystem = 1; | |
1914 | do_exec(s, cmd); | |
1915 | success = 1; | |
e9a17296 | 1916 | break; |
3c0ef626 | 1917 | } |
1918 | } | |
1919 | ||
1920 | if (!success) | |
e9a17296 | 1921 | log("subsystem request for %.100s failed, subsystem not found", |
3c0ef626 | 1922 | subsys); |
1923 | ||
1924 | xfree(subsys); | |
1925 | return success; | |
1926 | } | |
1927 | ||
1928 | static int | |
1929 | session_x11_req(Session *s) | |
1930 | { | |
1931 | int success; | |
1932 | ||
1933 | s->single_connection = packet_get_char(); | |
1934 | s->auth_proto = packet_get_string(NULL); | |
1935 | s->auth_data = packet_get_string(NULL); | |
1936 | s->screen = packet_get_int(); | |
e9a17296 | 1937 | packet_check_eom(); |
3c0ef626 | 1938 | |
1939 | success = session_setup_x11fwd(s); | |
1940 | if (!success) { | |
1941 | xfree(s->auth_proto); | |
1942 | xfree(s->auth_data); | |
1943 | s->auth_proto = NULL; | |
1944 | s->auth_data = NULL; | |
1945 | } | |
1946 | return success; | |
1947 | } | |
1948 | ||
1949 | static int | |
1950 | session_shell_req(Session *s) | |
1951 | { | |
e9a17296 | 1952 | packet_check_eom(); |
3c0ef626 | 1953 | do_exec(s, NULL); |
1954 | return 1; | |
1955 | } | |
1956 | ||
1957 | static int | |
1958 | session_exec_req(Session *s) | |
1959 | { | |
1960 | u_int len; | |
1961 | char *command = packet_get_string(&len); | |
e9a17296 | 1962 | packet_check_eom(); |
3c0ef626 | 1963 | do_exec(s, command); |
1964 | xfree(command); | |
1965 | return 1; | |
1966 | } | |
1967 | ||
1968 | static int | |
1969 | session_auth_agent_req(Session *s) | |
1970 | { | |
1971 | static int called = 0; | |
e9a17296 | 1972 | packet_check_eom(); |
3c0ef626 | 1973 | if (no_agent_forwarding_flag) { |
1974 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1975 | return 0; | |
1976 | } | |
1977 | if (called) { | |
1978 | return 0; | |
1979 | } else { | |
1980 | called = 1; | |
1981 | return auth_input_request_forwarding(s->pw); | |
1982 | } | |
1983 | } | |
1984 | ||
e9a17296 | 1985 | int |
1986 | session_input_channel_req(Channel *c, const char *rtype) | |
3c0ef626 | 1987 | { |
3c0ef626 | 1988 | int success = 0; |
3c0ef626 | 1989 | Session *s; |
3c0ef626 | 1990 | |
e9a17296 | 1991 | if ((s = session_by_channel(c->self)) == NULL) { |
1992 | log("session_input_channel_req: no session %d req %.100s", | |
1993 | c->self, rtype); | |
1994 | return 0; | |
1995 | } | |
1996 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
3c0ef626 | 1997 | |
1998 | /* | |
1999 | * a session is in LARVAL state until a shell, a command | |
2000 | * or a subsystem is executed | |
2001 | */ | |
2002 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2003 | if (strcmp(rtype, "shell") == 0) { | |
2004 | success = session_shell_req(s); | |
2005 | } else if (strcmp(rtype, "exec") == 0) { | |
2006 | success = session_exec_req(s); | |
2007 | } else if (strcmp(rtype, "pty-req") == 0) { | |
2008 | success = session_pty_req(s); | |
2009 | } else if (strcmp(rtype, "x11-req") == 0) { | |
2010 | success = session_x11_req(s); | |
2011 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { | |
2012 | success = session_auth_agent_req(s); | |
2013 | } else if (strcmp(rtype, "subsystem") == 0) { | |
2014 | success = session_subsystem_req(s); | |
2015 | } | |
2016 | } | |
2017 | if (strcmp(rtype, "window-change") == 0) { | |
2018 | success = session_window_change_req(s); | |
2019 | } | |
e9a17296 | 2020 | return success; |
3c0ef626 | 2021 | } |
2022 | ||
2023 | void | |
2024 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2025 | { | |
2026 | if (!compat20) | |
2027 | fatal("session_set_fds: called for proto != 2.0"); | |
2028 | /* | |
2029 | * now that have a child and a pipe to the child, | |
2030 | * we can activate our channel and register the fd's | |
2031 | */ | |
2032 | if (s->chanid == -1) | |
2033 | fatal("no channel for session %d", s->self); | |
2034 | channel_set_fds(s->chanid, | |
2035 | fdout, fdin, fderr, | |
2036 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
e9a17296 | 2037 | 1, |
2038 | CHAN_SES_WINDOW_DEFAULT); | |
3c0ef626 | 2039 | } |
2040 | ||
2041 | /* | |
2042 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2043 | * (e.g., due to a dropped connection). | |
2044 | */ | |
2980ea68 | 2045 | void |
2046 | session_pty_cleanup2(void *session) | |
3c0ef626 | 2047 | { |
2048 | Session *s = session; | |
2049 | ||
2050 | if (s == NULL) { | |
2051 | error("session_pty_cleanup: no session"); | |
2052 | return; | |
2053 | } | |
2054 | if (s->ttyfd == -1) | |
2055 | return; | |
2056 | ||
2057 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); | |
2058 | ||
2059 | /* Record that the user has logged out. */ | |
2060 | if (s->pid != 0) | |
e9a17296 | 2061 | record_logout(s->pid, s->tty, s->pw->pw_name); |
3c0ef626 | 2062 | |
2063 | /* Release the pseudo-tty. */ | |
2980ea68 | 2064 | if (getuid() == 0) |
2065 | pty_release(s->tty); | |
3c0ef626 | 2066 | |
2067 | /* | |
2068 | * Close the server side of the socket pairs. We must do this after | |
2069 | * the pty cleanup, so that another process doesn't get this pty | |
2070 | * while we're still cleaning up. | |
2071 | */ | |
2072 | if (close(s->ptymaster) < 0) | |
2980ea68 | 2073 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
3c0ef626 | 2074 | |
2075 | /* unlink pty from session */ | |
2076 | s->ttyfd = -1; | |
2077 | } | |
2078 | ||
2980ea68 | 2079 | void |
2080 | session_pty_cleanup(void *session) | |
2081 | { | |
2082 | PRIVSEP(session_pty_cleanup2(session)); | |
2083 | } | |
2084 | ||
e54b3d7c | 2085 | static char * |
2086 | sig2name(int sig) | |
2087 | { | |
2088 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2089 | SSH_SIG(ABRT); | |
2090 | SSH_SIG(ALRM); | |
2091 | SSH_SIG(FPE); | |
2092 | SSH_SIG(HUP); | |
2093 | SSH_SIG(ILL); | |
2094 | SSH_SIG(INT); | |
2095 | SSH_SIG(KILL); | |
2096 | SSH_SIG(PIPE); | |
2097 | SSH_SIG(QUIT); | |
2098 | SSH_SIG(SEGV); | |
2099 | SSH_SIG(TERM); | |
2100 | SSH_SIG(USR1); | |
2101 | SSH_SIG(USR2); | |
2102 | #undef SSH_SIG | |
2103 | return "SIG@openssh.com"; | |
2104 | } | |
2105 | ||
3c0ef626 | 2106 | static void |
2107 | session_exit_message(Session *s, int status) | |
2108 | { | |
2109 | Channel *c; | |
e9a17296 | 2110 | |
2111 | if ((c = channel_lookup(s->chanid)) == NULL) | |
3c0ef626 | 2112 | fatal("session_exit_message: session %d: no channel %d", |
2113 | s->self, s->chanid); | |
ff2d7a98 | 2114 | debug("session_exit_message: session %d channel %d pid %ld", |
2115 | s->self, s->chanid, (long)s->pid); | |
3c0ef626 | 2116 | |
2117 | if (WIFEXITED(status)) { | |
e9a17296 | 2118 | channel_request_start(s->chanid, "exit-status", 0); |
3c0ef626 | 2119 | packet_put_int(WEXITSTATUS(status)); |
2120 | packet_send(); | |
2121 | } else if (WIFSIGNALED(status)) { | |
e9a17296 | 2122 | channel_request_start(s->chanid, "exit-signal", 0); |
e54b3d7c | 2123 | packet_put_cstring(sig2name(WTERMSIG(status))); |
3c0ef626 | 2124 | #ifdef WCOREDUMP |
2125 | packet_put_char(WCOREDUMP(status)); | |
2126 | #else /* WCOREDUMP */ | |
2127 | packet_put_char(0); | |
2128 | #endif /* WCOREDUMP */ | |
2129 | packet_put_cstring(""); | |
2130 | packet_put_cstring(""); | |
2131 | packet_send(); | |
2132 | } else { | |
2133 | /* Some weird exit cause. Just exit. */ | |
2134 | packet_disconnect("wait returned status %04x.", status); | |
2135 | } | |
2136 | ||
2137 | /* disconnect channel */ | |
2138 | debug("session_exit_message: release channel %d", s->chanid); | |
2139 | channel_cancel_cleanup(s->chanid); | |
2140 | /* | |
2141 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2142 | * interested in data we write. | |
2143 | * Note that we must not call 'chan_read_failed', since there could | |
2144 | * be some more data waiting in the pipe. | |
2145 | */ | |
2146 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2147 | chan_write_failed(c); | |
2148 | s->chanid = -1; | |
2149 | } | |
2150 | ||
2980ea68 | 2151 | void |
3c0ef626 | 2152 | session_close(Session *s) |
2153 | { | |
ff2d7a98 | 2154 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
3c0ef626 | 2155 | if (s->ttyfd != -1) { |
2156 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
2157 | session_pty_cleanup(s); | |
2158 | } | |
2159 | if (s->term) | |
2160 | xfree(s->term); | |
2161 | if (s->display) | |
2162 | xfree(s->display); | |
e9a17296 | 2163 | if (s->auth_display) |
2164 | xfree(s->auth_display); | |
3c0ef626 | 2165 | if (s->auth_data) |
2166 | xfree(s->auth_data); | |
2167 | if (s->auth_proto) | |
2168 | xfree(s->auth_proto); | |
2169 | s->used = 0; | |
2170 | session_proctitle(s); | |
2171 | } | |
2172 | ||
2173 | void | |
2174 | session_close_by_pid(pid_t pid, int status) | |
2175 | { | |
2176 | Session *s = session_by_pid(pid); | |
2177 | if (s == NULL) { | |
ff2d7a98 | 2178 | debug("session_close_by_pid: no session for pid %ld", |
2179 | (long)pid); | |
3c0ef626 | 2180 | return; |
2181 | } | |
2182 | if (s->chanid != -1) | |
2183 | session_exit_message(s, status); | |
2184 | session_close(s); | |
2185 | } | |
2186 | ||
2187 | /* | |
2188 | * this is called when a channel dies before | |
2189 | * the session 'child' itself dies | |
2190 | */ | |
2191 | void | |
2192 | session_close_by_channel(int id, void *arg) | |
2193 | { | |
2194 | Session *s = session_by_channel(id); | |
2195 | if (s == NULL) { | |
2196 | debug("session_close_by_channel: no session for id %d", id); | |
2197 | return; | |
2198 | } | |
ff2d7a98 | 2199 | debug("session_close_by_channel: channel %d child %ld", |
2200 | id, (long)s->pid); | |
3c0ef626 | 2201 | if (s->pid != 0) { |
2202 | debug("session_close_by_channel: channel %d: has child", id); | |
2203 | /* | |
2204 | * delay detach of session, but release pty, since | |
2205 | * the fd's to the child are already closed | |
2206 | */ | |
2207 | if (s->ttyfd != -1) { | |
2208 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
2209 | session_pty_cleanup(s); | |
2210 | } | |
2211 | return; | |
2212 | } | |
2213 | /* detach by removing callback */ | |
2214 | channel_cancel_cleanup(s->chanid); | |
2215 | s->chanid = -1; | |
2216 | session_close(s); | |
2217 | } | |
2218 | ||
2219 | void | |
2980ea68 | 2220 | session_destroy_all(void (*closefunc)(Session *)) |
3c0ef626 | 2221 | { |
2222 | int i; | |
e9a17296 | 2223 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2224 | Session *s = &sessions[i]; |
2980ea68 | 2225 | if (s->used) { |
2226 | if (closefunc != NULL) | |
2227 | closefunc(s); | |
2228 | else | |
2229 | session_close(s); | |
2230 | } | |
3c0ef626 | 2231 | } |
2232 | } | |
2233 | ||
2234 | static char * | |
2235 | session_tty_list(void) | |
2236 | { | |
2237 | static char buf[1024]; | |
2238 | int i; | |
1c14df9e | 2239 | char *cp; |
2240 | ||
3c0ef626 | 2241 | buf[0] = '\0'; |
e9a17296 | 2242 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2243 | Session *s = &sessions[i]; |
2244 | if (s->used && s->ttyfd != -1) { | |
1c14df9e | 2245 | |
2246 | if (strncmp(s->tty, "/dev/", 5) != 0) { | |
2247 | cp = strrchr(s->tty, '/'); | |
2248 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2249 | } else | |
2250 | cp = s->tty + 5; | |
2251 | ||
3c0ef626 | 2252 | if (buf[0] != '\0') |
2253 | strlcat(buf, ",", sizeof buf); | |
1c14df9e | 2254 | strlcat(buf, cp, sizeof buf); |
3c0ef626 | 2255 | } |
2256 | } | |
2257 | if (buf[0] == '\0') | |
2258 | strlcpy(buf, "notty", sizeof buf); | |
2259 | return buf; | |
2260 | } | |
2261 | ||
2262 | void | |
2263 | session_proctitle(Session *s) | |
2264 | { | |
2265 | if (s->pw == NULL) | |
2266 | error("no user for session %d", s->self); | |
2267 | else | |
2268 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2269 | } | |
2270 | ||
2271 | int | |
2272 | session_setup_x11fwd(Session *s) | |
2273 | { | |
2274 | struct stat st; | |
e9a17296 | 2275 | char display[512], auth_display[512]; |
2276 | char hostname[MAXHOSTNAMELEN]; | |
3c0ef626 | 2277 | |
2278 | if (no_x11_forwarding_flag) { | |
2279 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2280 | return 0; | |
2281 | } | |
2282 | if (!options.x11_forwarding) { | |
2283 | debug("X11 forwarding disabled in server configuration file."); | |
2284 | return 0; | |
2285 | } | |
2286 | if (!options.xauth_location || | |
2287 | (stat(options.xauth_location, &st) == -1)) { | |
2288 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2289 | return 0; | |
2290 | } | |
2291 | if (options.use_login) { | |
2292 | packet_send_debug("X11 forwarding disabled; " | |
2293 | "not compatible with UseLogin=yes."); | |
2294 | return 0; | |
2295 | } | |
2296 | if (s->display != NULL) { | |
2297 | debug("X11 display already set."); | |
2298 | return 0; | |
2299 | } | |
ff2d7a98 | 2300 | if (x11_create_display_inet(options.x11_display_offset, |
2301 | options.x11_use_localhost, s->single_connection, | |
2302 | &s->display_number) == -1) { | |
3c0ef626 | 2303 | debug("x11_create_display_inet failed."); |
2304 | return 0; | |
2305 | } | |
e9a17296 | 2306 | |
2307 | /* Set up a suitable value for the DISPLAY variable. */ | |
2308 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2309 | fatal("gethostname: %.100s", strerror(errno)); | |
2310 | /* | |
2311 | * auth_display must be used as the displayname when the | |
2312 | * authorization entry is added with xauth(1). This will be | |
2313 | * different than the DISPLAY string for localhost displays. | |
2314 | */ | |
2315 | if (options.x11_use_localhost) { | |
ff2d7a98 | 2316 | snprintf(display, sizeof display, "localhost:%u.%u", |
e9a17296 | 2317 | s->display_number, s->screen); |
ff2d7a98 | 2318 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
e9a17296 | 2319 | s->display_number, s->screen); |
2320 | s->display = xstrdup(display); | |
2321 | s->auth_display = xstrdup(auth_display); | |
2322 | } else { | |
2323 | #ifdef IPADDR_IN_DISPLAY | |
2324 | struct hostent *he; | |
2325 | struct in_addr my_addr; | |
2326 | ||
2327 | he = gethostbyname(hostname); | |
2328 | if (he == NULL) { | |
2329 | error("Can't get IP address for X11 DISPLAY."); | |
2330 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2331 | return 0; | |
2332 | } | |
2333 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
ff2d7a98 | 2334 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
e9a17296 | 2335 | s->display_number, s->screen); |
2336 | #else | |
ff2d7a98 | 2337 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
e9a17296 | 2338 | s->display_number, s->screen); |
2339 | #endif | |
2340 | s->display = xstrdup(display); | |
2341 | s->auth_display = xstrdup(display); | |
2342 | } | |
2343 | ||
3c0ef626 | 2344 | return 1; |
2345 | } | |
2346 | ||
2347 | static void | |
2348 | do_authenticated2(Authctxt *authctxt) | |
2349 | { | |
2350 | server_loop2(authctxt); | |
b9a54c29 | 2351 | #if defined(GSSAPI) |
2352 | ssh_gssapi_cleanup_creds(NULL); | |
2353 | #endif | |
3c0ef626 | 2354 | } |