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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" | |
1b56ff3d | 36 | RCSID("$OpenBSD: session.c,v 1.180 2004/07/28 09:40:29 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" | |
1b56ff3d | 45 | #include "match.h" |
3c0ef626 | 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 | |
416fd2a8 | 61 | #if defined(KRB5) && defined(USE_AFS) |
62 | #include <kafs.h> | |
63 | #endif | |
64 | ||
b9a54c29 | 65 | #ifdef GSSAPI |
66 | #include "ssh-gss.h" | |
67 | #endif | |
68 | ||
3c0ef626 | 69 | /* func */ |
70 | ||
71 | Session *session_new(void); | |
72 | void session_set_fds(Session *, int, int, int); | |
416fd2a8 | 73 | void session_pty_cleanup(Session *); |
3c0ef626 | 74 | void session_proctitle(Session *); |
75 | int session_setup_x11fwd(Session *); | |
76 | void do_exec_pty(Session *, const char *); | |
77 | void do_exec_no_pty(Session *, const char *); | |
78 | void do_exec(Session *, const char *); | |
79 | void do_login(Session *, const char *); | |
80 | #ifdef LOGIN_NEEDS_UTMPX | |
81 | static void do_pre_login(Session *s); | |
82 | #endif | |
83 | void do_child(Session *, const char *); | |
84 | void do_motd(void); | |
85 | int check_quietlogin(Session *, const char *); | |
86 | ||
87 | static void do_authenticated1(Authctxt *); | |
88 | static void do_authenticated2(Authctxt *); | |
89 | ||
3c0ef626 | 90 | static int session_pty_req(Session *); |
91 | ||
88928908 | 92 | #ifdef SESSION_HOOKS |
93 | static void execute_session_hook(char* prog, Authctxt *authctxt, | |
94 | int startup, int save); | |
95 | #endif | |
96 | ||
3c0ef626 | 97 | /* import */ |
98 | extern ServerOptions options; | |
99 | extern char *__progname; | |
100 | extern int log_stderr; | |
101 | extern int debug_flag; | |
102 | extern u_int utmp_len; | |
103 | extern int startup_pipe; | |
104 | extern void destroy_sensitive_data(void); | |
70791e56 | 105 | extern Buffer loginmsg; |
3c0ef626 | 106 | |
107 | /* original command from peer. */ | |
108 | const char *original_command = NULL; | |
109 | ||
110 | /* data */ | |
111 | #define MAX_SESSIONS 10 | |
112 | Session sessions[MAX_SESSIONS]; | |
113 | ||
3c0ef626 | 114 | #ifdef HAVE_LOGIN_CAP |
2980ea68 | 115 | login_cap_t *lc; |
3c0ef626 | 116 | #endif |
117 | ||
416fd2a8 | 118 | static int is_child = 0; |
119 | ||
ff2d7a98 | 120 | /* Name and directory of socket for authentication agent forwarding. */ |
121 | static char *auth_sock_name = NULL; | |
122 | static char *auth_sock_dir = NULL; | |
123 | ||
124 | /* removes the agent forwarding socket */ | |
125 | ||
126 | static void | |
416fd2a8 | 127 | auth_sock_cleanup_proc(struct passwd *pw) |
ff2d7a98 | 128 | { |
ff2d7a98 | 129 | if (auth_sock_name != NULL) { |
130 | temporarily_use_uid(pw); | |
131 | unlink(auth_sock_name); | |
132 | rmdir(auth_sock_dir); | |
133 | auth_sock_name = NULL; | |
134 | restore_uid(); | |
135 | } | |
136 | } | |
137 | ||
138 | static int | |
139 | auth_input_request_forwarding(struct passwd * pw) | |
140 | { | |
141 | Channel *nc; | |
142 | int sock; | |
143 | struct sockaddr_un sunaddr; | |
144 | ||
145 | if (auth_sock_name != NULL) { | |
146 | error("authentication forwarding requested twice."); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
151 | temporarily_use_uid(pw); | |
152 | ||
153 | /* Allocate a buffer for the socket name, and format the name. */ | |
154 | auth_sock_name = xmalloc(MAXPATHLEN); | |
155 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
416fd2a8 | 156 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
ff2d7a98 | 157 | |
158 | /* Create private directory for socket */ | |
159 | if (mkdtemp(auth_sock_dir) == NULL) { | |
160 | packet_send_debug("Agent forwarding disabled: " | |
161 | "mkdtemp() failed: %.100s", strerror(errno)); | |
162 | restore_uid(); | |
163 | xfree(auth_sock_name); | |
164 | xfree(auth_sock_dir); | |
165 | auth_sock_name = NULL; | |
166 | auth_sock_dir = NULL; | |
167 | return 0; | |
168 | } | |
169 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", | |
170 | auth_sock_dir, (long) getpid()); | |
171 | ||
ff2d7a98 | 172 | /* Create the socket. */ |
173 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
174 | if (sock < 0) | |
175 | packet_disconnect("socket: %.100s", strerror(errno)); | |
176 | ||
177 | /* Bind it to the name. */ | |
178 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
179 | sunaddr.sun_family = AF_UNIX; | |
180 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
181 | ||
182 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
183 | packet_disconnect("bind: %.100s", strerror(errno)); | |
184 | ||
185 | /* Restore the privileged uid. */ | |
186 | restore_uid(); | |
187 | ||
188 | /* Start listening on the socket. */ | |
416fd2a8 | 189 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
ff2d7a98 | 190 | packet_disconnect("listen: %.100s", strerror(errno)); |
191 | ||
192 | /* Allocate a channel for the authentication agent socket. */ | |
193 | nc = channel_new("auth socket", | |
194 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
195 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
70791e56 | 196 | 0, "auth socket", 1); |
ff2d7a98 | 197 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
198 | return 1; | |
199 | } | |
200 | ||
416fd2a8 | 201 | static void |
202 | display_loginmsg(void) | |
203 | { | |
1b56ff3d | 204 | if (buffer_len(&loginmsg) > 0) { |
205 | buffer_append(&loginmsg, "\0", 1); | |
206 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
207 | buffer_clear(&loginmsg); | |
208 | } | |
416fd2a8 | 209 | } |
ff2d7a98 | 210 | |
3c0ef626 | 211 | void |
212 | do_authenticated(Authctxt *authctxt) | |
213 | { | |
1c14df9e | 214 | setproctitle("%s", authctxt->pw->pw_name); |
215 | ||
3c0ef626 | 216 | /* |
217 | * Cancel the alarm we set to limit the time taken for | |
218 | * authentication. | |
219 | */ | |
220 | alarm(0); | |
221 | if (startup_pipe != -1) { | |
222 | close(startup_pipe); | |
223 | startup_pipe = -1; | |
224 | } | |
3c0ef626 | 225 | /* setup the channel layer */ |
226 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
227 | channel_permit_all_opens(); | |
228 | ||
229 | if (compat20) | |
230 | do_authenticated2(authctxt); | |
231 | else | |
232 | do_authenticated1(authctxt); | |
233 | ||
88928908 | 234 | #ifdef SESSION_HOOKS |
235 | if (options.session_hooks_allow && | |
236 | options.session_hooks_shutdown_cmd) | |
237 | { | |
238 | execute_session_hook(options.session_hooks_shutdown_cmd, | |
239 | authctxt, | |
240 | /* startup = */ 0, /* save = */ 0); | |
241 | ||
242 | if (authctxt->session_env_file) | |
243 | { | |
244 | free(authctxt->session_env_file); | |
245 | } | |
246 | } | |
247 | #endif | |
416fd2a8 | 248 | |
249 | do_cleanup(authctxt); | |
3c0ef626 | 250 | } |
251 | ||
252 | /* | |
253 | * Prepares for an interactive session. This is called after the user has | |
254 | * been successfully authenticated. During this message exchange, pseudo | |
255 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
256 | * are requested, etc. | |
257 | */ | |
258 | static void | |
259 | do_authenticated1(Authctxt *authctxt) | |
260 | { | |
261 | Session *s; | |
262 | char *command; | |
e9a17296 | 263 | int success, type, screen_flag; |
ff2d7a98 | 264 | int enable_compression_after_reply = 0; |
265 | u_int proto_len, data_len, dlen, compression_level = 0; | |
3c0ef626 | 266 | |
267 | s = session_new(); | |
268 | s->authctxt = authctxt; | |
269 | s->pw = authctxt->pw; | |
270 | ||
271 | /* | |
272 | * We stay in this loop until the client requests to execute a shell | |
273 | * or a command. | |
274 | */ | |
275 | for (;;) { | |
276 | success = 0; | |
277 | ||
278 | /* Get a packet from the client. */ | |
e9a17296 | 279 | type = packet_read(); |
3c0ef626 | 280 | |
281 | /* Process the packet. */ | |
282 | switch (type) { | |
283 | case SSH_CMSG_REQUEST_COMPRESSION: | |
3c0ef626 | 284 | compression_level = packet_get_int(); |
e9a17296 | 285 | packet_check_eom(); |
3c0ef626 | 286 | if (compression_level < 1 || compression_level > 9) { |
1b56ff3d | 287 | packet_send_debug("Received invalid compression level %d.", |
e9a17296 | 288 | compression_level); |
3c0ef626 | 289 | break; |
290 | } | |
ff2d7a98 | 291 | if (!options.compression) { |
292 | debug2("compression disabled"); | |
293 | break; | |
294 | } | |
3c0ef626 | 295 | /* Enable compression after we have responded with SUCCESS. */ |
296 | enable_compression_after_reply = 1; | |
297 | success = 1; | |
298 | break; | |
299 | ||
300 | case SSH_CMSG_REQUEST_PTY: | |
301 | success = session_pty_req(s); | |
302 | break; | |
303 | ||
304 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
305 | s->auth_proto = packet_get_string(&proto_len); | |
306 | s->auth_data = packet_get_string(&data_len); | |
307 | ||
308 | screen_flag = packet_get_protocol_flags() & | |
309 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
310 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
311 | ||
312 | if (packet_remaining() == 4) { | |
313 | if (!screen_flag) | |
314 | debug2("Buggy client: " | |
315 | "X11 screen flag missing"); | |
316 | s->screen = packet_get_int(); | |
317 | } else { | |
318 | s->screen = 0; | |
319 | } | |
e9a17296 | 320 | packet_check_eom(); |
3c0ef626 | 321 | success = session_setup_x11fwd(s); |
322 | if (!success) { | |
323 | xfree(s->auth_proto); | |
324 | xfree(s->auth_data); | |
325 | s->auth_proto = NULL; | |
326 | s->auth_data = NULL; | |
327 | } | |
328 | break; | |
329 | ||
330 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
331 | if (no_agent_forwarding_flag || compat13) { | |
332 | debug("Authentication agent forwarding not permitted for this authentication."); | |
333 | break; | |
334 | } | |
335 | debug("Received authentication agent forwarding request."); | |
336 | success = auth_input_request_forwarding(s->pw); | |
337 | break; | |
338 | ||
339 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
340 | if (no_port_forwarding_flag) { | |
341 | debug("Port forwarding not permitted for this authentication."); | |
342 | break; | |
343 | } | |
344 | if (!options.allow_tcp_forwarding) { | |
345 | debug("Port forwarding not permitted."); | |
346 | break; | |
347 | } | |
348 | debug("Received TCP/IP port forwarding request."); | |
349 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); | |
350 | success = 1; | |
351 | break; | |
352 | ||
353 | case SSH_CMSG_MAX_PACKET_SIZE: | |
354 | if (packet_set_maxsize(packet_get_int()) > 0) | |
355 | success = 1; | |
356 | break; | |
e9a17296 | 357 | |
3c0ef626 | 358 | case SSH_CMSG_EXEC_SHELL: |
359 | case SSH_CMSG_EXEC_CMD: | |
360 | if (type == SSH_CMSG_EXEC_CMD) { | |
361 | command = packet_get_string(&dlen); | |
362 | debug("Exec command '%.500s'", command); | |
363 | do_exec(s, command); | |
364 | xfree(command); | |
365 | } else { | |
366 | do_exec(s, NULL); | |
367 | } | |
e9a17296 | 368 | packet_check_eom(); |
3c0ef626 | 369 | session_close(s); |
370 | return; | |
371 | ||
372 | default: | |
373 | /* | |
374 | * Any unknown messages in this phase are ignored, | |
375 | * and a failure message is returned. | |
376 | */ | |
70791e56 | 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 | { | |
ff2d7a98 | 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) | |
416fd2a8 | 421 | if (options.use_pam && !use_privsep) |
70791e56 | 422 | do_pam_setcred(1); |
3c0ef626 | 423 | #endif /* USE_PAM */ |
424 | ||
425 | /* Fork the child. */ | |
426 | if ((pid = fork()) == 0) { | |
416fd2a8 | 427 | is_child = 1; |
e54b3d7c | 428 | |
3c0ef626 | 429 | /* Child. Reinitialize the log since the pid has changed. */ |
430 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
431 | ||
432 | /* | |
433 | * Create a new session and process group since the 4.4BSD | |
434 | * setlogin() affects the entire process group. | |
435 | */ | |
436 | if (setsid() < 0) | |
437 | error("setsid failed: %.100s", strerror(errno)); | |
438 | ||
439 | #ifdef USE_PIPES | |
440 | /* | |
441 | * Redirect stdin. We close the parent side of the socket | |
442 | * pair, and make the child side the standard input. | |
443 | */ | |
444 | close(pin[1]); | |
445 | if (dup2(pin[0], 0) < 0) | |
446 | perror("dup2 stdin"); | |
447 | close(pin[0]); | |
448 | ||
449 | /* Redirect stdout. */ | |
450 | close(pout[0]); | |
451 | if (dup2(pout[1], 1) < 0) | |
452 | perror("dup2 stdout"); | |
453 | close(pout[1]); | |
454 | ||
455 | /* Redirect stderr. */ | |
456 | close(perr[0]); | |
457 | if (dup2(perr[1], 2) < 0) | |
458 | perror("dup2 stderr"); | |
459 | close(perr[1]); | |
460 | #else /* USE_PIPES */ | |
461 | /* | |
462 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
463 | * use the same socket, as some programs (particularly rdist) | |
464 | * seem to depend on it. | |
465 | */ | |
466 | close(inout[1]); | |
467 | close(err[1]); | |
468 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
469 | perror("dup2 stdin"); | |
470 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
471 | perror("dup2 stdout"); | |
472 | if (dup2(err[0], 2) < 0) /* stderr */ | |
473 | perror("dup2 stderr"); | |
474 | #endif /* USE_PIPES */ | |
475 | ||
e54b3d7c | 476 | #ifdef _UNICOS |
477 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
478 | #endif | |
479 | ||
3c0ef626 | 480 | /* Do processing for the child (exec command etc). */ |
481 | do_child(s, command); | |
482 | /* NOTREACHED */ | |
483 | } | |
e54b3d7c | 484 | #ifdef _UNICOS |
485 | signal(WJSIGNAL, cray_job_termination_handler); | |
486 | #endif /* _UNICOS */ | |
3c0ef626 | 487 | #ifdef HAVE_CYGWIN |
488 | if (is_winnt) | |
489 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
490 | #endif | |
491 | if (pid < 0) | |
492 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
493 | s->pid = pid; | |
494 | /* Set interactive/non-interactive mode. */ | |
495 | packet_set_interactive(s->display != NULL); | |
496 | #ifdef USE_PIPES | |
497 | /* We are the parent. Close the child sides of the pipes. */ | |
498 | close(pin[0]); | |
499 | close(pout[1]); | |
500 | close(perr[1]); | |
501 | ||
502 | if (compat20) { | |
1b56ff3d | 503 | if (s->is_subsystem) { |
504 | close(perr[0]); | |
505 | perr[0] = -1; | |
506 | } | |
507 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
3c0ef626 | 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 | ||
2a304a95 | 518 | /* |
519 | * Clear loginmsg, since it's the child's responsibility to display | |
520 | * it to the user, otherwise multiple sessions may accumulate | |
521 | * multiple copies of the login messages. | |
522 | */ | |
523 | buffer_clear(&loginmsg); | |
524 | ||
3c0ef626 | 525 | /* |
526 | * Enter the interactive session. Note: server_loop must be able to | |
527 | * handle the case that fdin and fdout are the same. | |
528 | */ | |
529 | if (compat20) { | |
530 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); | |
531 | } else { | |
532 | server_loop(pid, inout[1], inout[1], err[1]); | |
533 | /* server_loop has closed inout[1] and err[1]. */ | |
534 | } | |
535 | #endif /* USE_PIPES */ | |
536 | } | |
537 | ||
538 | /* | |
539 | * This is called to fork and execute a command when we have a tty. This | |
540 | * will call do_child from the child, and server_loop from the parent after | |
541 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
542 | * lastlog, and other such operations. | |
543 | */ | |
544 | void | |
545 | do_exec_pty(Session *s, const char *command) | |
546 | { | |
547 | int fdout, ptyfd, ttyfd, ptymaster; | |
548 | pid_t pid; | |
549 | ||
550 | if (s == NULL) | |
551 | fatal("do_exec_pty: no session"); | |
552 | ptyfd = s->ptyfd; | |
553 | ttyfd = s->ttyfd; | |
554 | ||
555 | #if defined(USE_PAM) | |
70791e56 | 556 | if (options.use_pam) { |
557 | do_pam_set_tty(s->tty); | |
416fd2a8 | 558 | if (!use_privsep) |
559 | do_pam_setcred(1); | |
70791e56 | 560 | } |
3c0ef626 | 561 | #endif |
562 | ||
563 | /* Fork the child. */ | |
564 | if ((pid = fork()) == 0) { | |
416fd2a8 | 565 | is_child = 1; |
3c0ef626 | 566 | |
567 | /* Child. Reinitialize the log because the pid has changed. */ | |
568 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
569 | /* Close the master side of the pseudo tty. */ | |
570 | close(ptyfd); | |
571 | ||
572 | /* Make the pseudo tty our controlling tty. */ | |
573 | pty_make_controlling_tty(&ttyfd, s->tty); | |
574 | ||
575 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ | |
576 | if (dup2(ttyfd, 0) < 0) | |
577 | error("dup2 stdin: %s", strerror(errno)); | |
578 | if (dup2(ttyfd, 1) < 0) | |
579 | error("dup2 stdout: %s", strerror(errno)); | |
580 | if (dup2(ttyfd, 2) < 0) | |
581 | error("dup2 stderr: %s", strerror(errno)); | |
582 | ||
583 | /* Close the extra descriptor for the pseudo tty. */ | |
584 | close(ttyfd); | |
585 | ||
586 | /* record login, etc. similar to login(1) */ | |
587 | #ifndef HAVE_OSF_SIA | |
e54b3d7c | 588 | if (!(options.use_login && command == NULL)) { |
589 | #ifdef _UNICOS | |
590 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
591 | #endif /* _UNICOS */ | |
3c0ef626 | 592 | do_login(s, command); |
e54b3d7c | 593 | } |
3c0ef626 | 594 | # ifdef LOGIN_NEEDS_UTMPX |
595 | else | |
596 | do_pre_login(s); | |
597 | # endif | |
598 | #endif | |
599 | ||
600 | /* Do common processing for the child, such as execing the command. */ | |
601 | do_child(s, command); | |
602 | /* NOTREACHED */ | |
603 | } | |
e54b3d7c | 604 | #ifdef _UNICOS |
605 | signal(WJSIGNAL, cray_job_termination_handler); | |
606 | #endif /* _UNICOS */ | |
3c0ef626 | 607 | #ifdef HAVE_CYGWIN |
608 | if (is_winnt) | |
609 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
610 | #endif | |
611 | if (pid < 0) | |
612 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
613 | s->pid = pid; | |
614 | ||
615 | /* Parent. Close the slave side of the pseudo tty. */ | |
616 | close(ttyfd); | |
617 | ||
618 | /* | |
619 | * Create another descriptor of the pty master side for use as the | |
620 | * standard input. We could use the original descriptor, but this | |
621 | * simplifies code in server_loop. The descriptor is bidirectional. | |
622 | */ | |
623 | fdout = dup(ptyfd); | |
624 | if (fdout < 0) | |
625 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
626 | ||
627 | /* we keep a reference to the pty master */ | |
628 | ptymaster = dup(ptyfd); | |
629 | if (ptymaster < 0) | |
630 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
631 | s->ptymaster = ptymaster; | |
632 | ||
633 | /* Enter interactive session. */ | |
634 | packet_set_interactive(1); | |
635 | if (compat20) { | |
636 | session_set_fds(s, ptyfd, fdout, -1); | |
637 | } else { | |
638 | server_loop(pid, ptyfd, fdout, -1); | |
639 | /* server_loop _has_ closed ptyfd and fdout. */ | |
640 | } | |
641 | } | |
642 | ||
643 | #ifdef LOGIN_NEEDS_UTMPX | |
644 | static void | |
645 | do_pre_login(Session *s) | |
646 | { | |
647 | socklen_t fromlen; | |
648 | struct sockaddr_storage from; | |
649 | pid_t pid = getpid(); | |
650 | ||
651 | /* | |
652 | * Get IP address of client. If the connection is not a socket, let | |
653 | * the address be 0.0.0.0. | |
654 | */ | |
655 | memset(&from, 0, sizeof(from)); | |
e54b3d7c | 656 | fromlen = sizeof(from); |
3c0ef626 | 657 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 658 | if (getpeername(packet_get_connection_in(), |
e9a17296 | 659 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 660 | debug("getpeername: %.100s", strerror(errno)); |
416fd2a8 | 661 | cleanup_exit(255); |
3c0ef626 | 662 | } |
663 | } | |
664 | ||
665 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
70791e56 | 666 | get_remote_name_or_ip(utmp_len, options.use_dns), |
1c14df9e | 667 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 668 | } |
669 | #endif | |
670 | ||
671 | /* | |
672 | * This is called to fork and execute a command. If another command is | |
673 | * to be forced, execute that instead. | |
674 | */ | |
675 | void | |
676 | do_exec(Session *s, const char *command) | |
677 | { | |
678 | if (forced_command) { | |
679 | original_command = command; | |
680 | command = forced_command; | |
681 | debug("Forced command '%.900s'", command); | |
682 | } | |
683 | ||
70791e56 | 684 | #if defined(SESSION_HOOKS) |
685 | if (options.session_hooks_allow && | |
686 | (options.session_hooks_startup_cmd || | |
687 | options.session_hooks_shutdown_cmd)) | |
688 | { | |
689 | char env_file[1000]; | |
690 | struct stat st; | |
691 | do | |
692 | { | |
693 | snprintf(env_file, | |
694 | sizeof(env_file), | |
695 | "/tmp/ssh_env_%d%d%d", | |
696 | getuid(), | |
697 | getpid(), | |
698 | rand()); | |
699 | } while (stat(env_file, &st)==0); | |
700 | s->authctxt->session_env_file = strdup(env_file); | |
701 | } | |
702 | #endif | |
703 | ||
704 | #ifdef GSSAPI | |
705 | if (options.gss_authentication) { | |
706 | temporarily_use_uid(s->pw); | |
707 | ssh_gssapi_storecreds(); | |
708 | restore_uid(); | |
709 | } | |
710 | #endif | |
711 | ||
3c0ef626 | 712 | if (s->ttyfd != -1) |
713 | do_exec_pty(s, command); | |
714 | else | |
715 | do_exec_no_pty(s, command); | |
716 | ||
717 | original_command = NULL; | |
3c0ef626 | 718 | |
1b56ff3d | 719 | /* |
720 | * Clear loginmsg: it's the child's responsibility to display | |
721 | * it to the user, otherwise multiple sessions may accumulate | |
722 | * multiple copies of the login messages. | |
723 | */ | |
724 | buffer_clear(&loginmsg); | |
725 | } | |
e9a17296 | 726 | |
3c0ef626 | 727 | /* administrative, login(1)-like work */ |
728 | void | |
729 | do_login(Session *s, const char *command) | |
730 | { | |
3c0ef626 | 731 | socklen_t fromlen; |
732 | struct sockaddr_storage from; | |
3c0ef626 | 733 | struct passwd * pw = s->pw; |
734 | pid_t pid = getpid(); | |
735 | ||
736 | /* | |
737 | * Get IP address of client. If the connection is not a socket, let | |
738 | * the address be 0.0.0.0. | |
739 | */ | |
740 | memset(&from, 0, sizeof(from)); | |
1c14df9e | 741 | fromlen = sizeof(from); |
3c0ef626 | 742 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 743 | if (getpeername(packet_get_connection_in(), |
e9a17296 | 744 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 745 | debug("getpeername: %.100s", strerror(errno)); |
416fd2a8 | 746 | cleanup_exit(255); |
3c0ef626 | 747 | } |
748 | } | |
749 | ||
3c0ef626 | 750 | /* Record that there was a login on that tty from the remote host. */ |
2980ea68 | 751 | if (!use_privsep) |
752 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
753 | get_remote_name_or_ip(utmp_len, | |
70791e56 | 754 | options.use_dns), |
e54b3d7c | 755 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 756 | |
757 | #ifdef USE_PAM | |
758 | /* | |
759 | * If password change is needed, do it now. | |
760 | * This needs to occur before the ~/.hushlogin check. | |
761 | */ | |
416fd2a8 | 762 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
763 | display_loginmsg(); | |
3c0ef626 | 764 | do_pam_chauthtok(); |
416fd2a8 | 765 | s->authctxt->force_pwchange = 0; |
70791e56 | 766 | /* XXX - signal [net] parent to enable forwardings */ |
3c0ef626 | 767 | } |
768 | #endif | |
769 | ||
770 | if (check_quietlogin(s, command)) | |
771 | return; | |
772 | ||
416fd2a8 | 773 | display_loginmsg(); |
3c0ef626 | 774 | |
3c0ef626 | 775 | do_motd(); |
776 | } | |
777 | ||
778 | /* | |
779 | * Display the message of the day. | |
780 | */ | |
781 | void | |
782 | do_motd(void) | |
783 | { | |
784 | FILE *f; | |
785 | char buf[256]; | |
786 | ||
787 | if (options.print_motd) { | |
788 | #ifdef HAVE_LOGIN_CAP | |
789 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
790 | "/etc/motd"), "r"); | |
791 | #else | |
792 | f = fopen("/etc/motd", "r"); | |
793 | #endif | |
794 | if (f) { | |
795 | while (fgets(buf, sizeof(buf), f)) | |
796 | fputs(buf, stdout); | |
797 | fclose(f); | |
798 | } | |
799 | } | |
800 | } | |
801 | ||
802 | ||
803 | /* | |
804 | * Check for quiet login, either .hushlogin or command given. | |
805 | */ | |
806 | int | |
807 | check_quietlogin(Session *s, const char *command) | |
808 | { | |
809 | char buf[256]; | |
810 | struct passwd *pw = s->pw; | |
811 | struct stat st; | |
812 | ||
813 | /* Return 1 if .hushlogin exists or a command given. */ | |
814 | if (command != NULL) | |
815 | return 1; | |
816 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
817 | #ifdef HAVE_LOGIN_CAP | |
818 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
819 | return 1; | |
820 | #else | |
821 | if (stat(buf, &st) >= 0) | |
822 | return 1; | |
823 | #endif | |
824 | return 0; | |
825 | } | |
826 | ||
827 | /* | |
828 | * Sets the value of the given variable in the environment. If the variable | |
829 | * already exists, its value is overriden. | |
830 | */ | |
b9a54c29 | 831 | void |
3c0ef626 | 832 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
e9a17296 | 833 | const char *value) |
3c0ef626 | 834 | { |
3c0ef626 | 835 | char **env; |
70791e56 | 836 | u_int envsize; |
837 | u_int i, namelen; | |
838 | ||
839 | /* | |
840 | * If we're passed an uninitialized list, allocate a single null | |
841 | * entry before continuing. | |
842 | */ | |
843 | if (*envp == NULL && *envsizep == 0) { | |
844 | *envp = xmalloc(sizeof(char *)); | |
845 | *envp[0] = NULL; | |
846 | *envsizep = 1; | |
847 | } | |
3c0ef626 | 848 | |
849 | /* | |
850 | * Find the slot where the value should be stored. If the variable | |
851 | * already exists, we reuse the slot; otherwise we append a new slot | |
852 | * at the end of the array, expanding if necessary. | |
853 | */ | |
854 | env = *envp; | |
855 | namelen = strlen(name); | |
856 | for (i = 0; env[i]; i++) | |
857 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
858 | break; | |
859 | if (env[i]) { | |
860 | /* Reuse the slot. */ | |
861 | xfree(env[i]); | |
862 | } else { | |
863 | /* New variable. Expand if necessary. */ | |
70791e56 | 864 | envsize = *envsizep; |
865 | if (i >= envsize - 1) { | |
866 | if (envsize >= 1000) | |
867 | fatal("child_set_env: too many env vars"); | |
868 | envsize += 50; | |
869 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); | |
870 | *envsizep = envsize; | |
3c0ef626 | 871 | } |
872 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
873 | env[i + 1] = NULL; | |
874 | } | |
875 | ||
876 | /* Allocate space and format the variable in the appropriate slot. */ | |
877 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
878 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
879 | } | |
880 | ||
881 | /* | |
882 | * Reads environment variables from the given file and adds/overrides them | |
883 | * into the environment. If the file does not exist, this does nothing. | |
884 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
885 | * and assignments of the form name=value. No other forms are allowed. | |
886 | */ | |
887 | static void | |
888 | read_environment_file(char ***env, u_int *envsize, | |
e9a17296 | 889 | const char *filename) |
3c0ef626 | 890 | { |
891 | FILE *f; | |
892 | char buf[4096]; | |
893 | char *cp, *value; | |
ff2d7a98 | 894 | u_int lineno = 0; |
3c0ef626 | 895 | |
896 | f = fopen(filename, "r"); | |
897 | if (!f) | |
898 | return; | |
899 | ||
900 | while (fgets(buf, sizeof(buf), f)) { | |
ff2d7a98 | 901 | if (++lineno > 1000) |
902 | fatal("Too many lines in environment file %s", filename); | |
3c0ef626 | 903 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
904 | ; | |
905 | if (!*cp || *cp == '#' || *cp == '\n') | |
906 | continue; | |
907 | if (strchr(cp, '\n')) | |
908 | *strchr(cp, '\n') = '\0'; | |
909 | value = strchr(cp, '='); | |
910 | if (value == NULL) { | |
ff2d7a98 | 911 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
912 | filename); | |
3c0ef626 | 913 | continue; |
914 | } | |
915 | /* | |
916 | * Replace the equals sign by nul, and advance value to | |
917 | * the value string. | |
918 | */ | |
919 | *value = '\0'; | |
920 | value++; | |
921 | child_set_env(env, envsize, cp, value); | |
922 | } | |
923 | fclose(f); | |
924 | } | |
925 | ||
88928908 | 926 | #ifdef SESSION_HOOKS |
927 | #define SSH_SESSION_ENV_FILE "SSH_SESSION_ENV_FILE" | |
928 | ||
929 | typedef enum { no_op, execute, clear_env, restore_env, | |
930 | read_env, save_or_rm_env } session_action_t; | |
931 | ||
932 | static session_action_t action_order[2][5] = { | |
933 | { clear_env, read_env, execute, save_or_rm_env, restore_env }, /*shutdown*/ | |
934 | { execute, read_env, save_or_rm_env, no_op, no_op } /*startup */ | |
935 | }; | |
936 | ||
937 | static | |
938 | void execute_session_hook(char* prog, Authctxt *authctxt, | |
939 | int startup, int save) | |
940 | { | |
941 | extern char **environ; | |
942 | ||
943 | struct stat st; | |
944 | char **saved_env, **tmpenv; | |
945 | char *env_file = authctxt->session_env_file; | |
946 | int i, status = 0; | |
947 | ||
948 | for (i=0; i<5; i++) | |
949 | { | |
950 | switch (action_order[startup][i]) | |
951 | { | |
952 | case no_op: | |
953 | break; | |
954 | ||
955 | case execute: | |
956 | { | |
957 | FILE* fp; | |
958 | char buf[1000]; | |
959 | ||
960 | snprintf(buf, | |
961 | sizeof(buf), | |
962 | "%s -c '%s'", | |
963 | authctxt->pw->pw_shell, | |
964 | prog); | |
965 | ||
966 | debug("executing session hook: [%s]", buf); | |
967 | setenv(SSH_SESSION_ENV_FILE, env_file, /* overwrite = */ 1); | |
968 | ||
969 | /* flusing is recommended in the popen(3) man page, to avoid | |
970 | intermingling of output */ | |
971 | fflush(stdout); | |
972 | fflush(stderr); | |
973 | if ((fp=popen(buf, "w")) == NULL) | |
974 | { | |
975 | perror("Unable to run session hook"); | |
976 | return; | |
977 | } | |
978 | status = pclose(fp); | |
979 | debug2("session hook executed, status=%d", status); | |
980 | unsetenv(SSH_SESSION_ENV_FILE); | |
981 | } | |
982 | break; | |
983 | ||
984 | case clear_env: | |
985 | saved_env = environ; | |
986 | tmpenv = (char**) malloc(sizeof(char*)); | |
987 | tmpenv[0] = NULL; | |
988 | environ = tmpenv; | |
989 | break; | |
990 | ||
991 | case restore_env: | |
992 | environ = saved_env; | |
993 | free(tmpenv); | |
994 | break; | |
995 | ||
996 | case read_env: | |
997 | if (status==0 && stat(env_file, &st)==0) | |
998 | { | |
999 | int envsize = 0; | |
1000 | ||
1001 | debug("reading environment from %s", env_file); | |
1002 | while (environ[envsize++]) ; | |
1003 | read_environment_file(&environ, &envsize, env_file); | |
1004 | } | |
1005 | break; | |
1006 | ||
1007 | case save_or_rm_env: | |
1008 | if (status==0 && save) | |
1009 | { | |
1010 | FILE* fp; | |
1011 | int envcount=0; | |
1012 | ||
1013 | debug2("saving environment to %s", env_file); | |
1014 | if ((fp = fopen(env_file, "w")) == NULL) /* hmm: file perms? */ | |
1015 | { | |
1016 | perror("Unable to save session hook info"); | |
1017 | } | |
1018 | while (environ[envcount]) | |
1019 | { | |
1020 | fprintf(fp, "%s\n", environ[envcount++]); | |
1021 | } | |
1022 | fflush(fp); | |
1023 | fclose(fp); | |
1024 | } | |
1025 | else if (stat(env_file, &st)==0) | |
1026 | { | |
1027 | debug2("removing environment file %s", env_file); | |
1028 | remove(env_file); | |
1029 | } | |
1030 | break; | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | } | |
1035 | #endif | |
1036 | ||
70791e56 | 1037 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
1038 | /* | |
1039 | * Return named variable from specified environment, or NULL if not present. | |
1040 | */ | |
1041 | static char * | |
1042 | child_get_env(char **env, const char *name) | |
1043 | { | |
1044 | int i; | |
1045 | size_t len; | |
1046 | ||
1047 | len = strlen(name); | |
1048 | for (i=0; env[i] != NULL; i++) | |
1049 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
1050 | return(env[i] + len + 1); | |
1051 | return NULL; | |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | * Read /etc/default/login. | |
1056 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
1057 | */ | |
1058 | static void | |
1059 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
1060 | { | |
1061 | char **tmpenv = NULL, *var; | |
1062 | u_int i, tmpenvsize = 0; | |
416fd2a8 | 1063 | u_long mask; |
70791e56 | 1064 | |
1065 | /* | |
1066 | * We don't want to copy the whole file to the child's environment, | |
1067 | * so we use a temporary environment and copy the variables we're | |
1068 | * interested in. | |
1069 | */ | |
1070 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
1071 | ||
1072 | if (tmpenv == NULL) | |
1073 | return; | |
1074 | ||
1075 | if (uid == 0) | |
1076 | var = child_get_env(tmpenv, "SUPATH"); | |
1077 | else | |
1078 | var = child_get_env(tmpenv, "PATH"); | |
1079 | if (var != NULL) | |
1080 | child_set_env(env, envsize, "PATH", var); | |
416fd2a8 | 1081 | |
70791e56 | 1082 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
1083 | if (sscanf(var, "%5lo", &mask) == 1) | |
416fd2a8 | 1084 | umask((mode_t)mask); |
1085 | ||
70791e56 | 1086 | for (i = 0; tmpenv[i] != NULL; i++) |
1087 | xfree(tmpenv[i]); | |
1088 | xfree(tmpenv); | |
1089 | } | |
1090 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
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); | |
416fd2a8 | 1110 | |
e9a17296 | 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; |
70791e56 | 1120 | char **env, *laddr, *path = NULL; |
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 |
416fd2a8 | 1137 | /* Allow any GSSAPI methods that we've used to alter |
b9a54c29 | 1138 | * the childs environment as they see fit |
1139 | */ | |
70791e56 | 1140 | ssh_gssapi_do_child(&env, &envsize); |
b9a54c29 | 1141 | #endif |
1142 | ||
3c0ef626 | 1143 | if (!options.use_login) { |
1144 | /* Set basic environment. */ | |
1b56ff3d | 1145 | for (i = 0; i < s->num_env; i++) |
1146 | child_set_env(&env, &envsize, s->env[i].name, | |
1147 | s->env[i].val); | |
1148 | ||
3c0ef626 | 1149 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1150 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1c14df9e | 1151 | #ifdef _AIX |
1152 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1153 | #endif | |
3c0ef626 | 1154 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
1155 | #ifdef HAVE_LOGIN_CAP | |
e54b3d7c | 1156 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
70791e56 | 1157 | child_set_env(&env, &envsize, "PATH", |
1158 | _PATH_STDPATH_WITH_SCP); | |
e54b3d7c | 1159 | else |
1160 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
3c0ef626 | 1161 | #else /* HAVE_LOGIN_CAP */ |
1162 | # ifndef HAVE_CYGWIN | |
1163 | /* | |
1164 | * There's no standard path on Windows. The path contains | |
1165 | * important components pointing to the system directories, | |
1166 | * needed for loading shared libraries. So the path better | |
1167 | * remains intact here. | |
1168 | */ | |
70791e56 | 1169 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1170 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1171 | path = child_get_env(env, "PATH"); | |
1172 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1173 | if (path == NULL || *path == '\0') { | |
416fd2a8 | 1174 | child_set_env(&env, &envsize, "PATH", |
70791e56 | 1175 | s->pw->pw_uid == 0 ? |
1176 | SUPERUSER_PATH : _PATH_STDPATH_WITH_SCP); | |
1177 | } | |
3c0ef626 | 1178 | # endif /* HAVE_CYGWIN */ |
1179 | #endif /* HAVE_LOGIN_CAP */ | |
1180 | ||
1181 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1182 | _PATH_MAILDIR, pw->pw_name); | |
1183 | child_set_env(&env, &envsize, "MAIL", buf); | |
1184 | ||
1185 | /* Normal systems set SHELL by default. */ | |
1186 | child_set_env(&env, &envsize, "SHELL", shell); | |
1187 | } | |
1188 | if (getenv("TZ")) | |
1189 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1190 | ||
2a304a95 | 1191 | #ifdef GSI /* GSI shared libs typically installed in non-system locations. */ |
1192 | { | |
1193 | char *cp; | |
1194 | ||
1195 | if ((cp = getenv("LD_LIBRARY_PATH")) != NULL) | |
1196 | child_set_env(&env, &envsize, "LD_LIBRARY_PATH", cp); | |
1197 | if ((cp = getenv("LIBPATH")) != NULL) | |
1198 | child_set_env(&env, &envsize, "LIBPATH", cp); | |
1199 | if ((cp = getenv("SHLIB_PATH")) != NULL) | |
1200 | child_set_env(&env, &envsize, "SHLIB_PATH", cp); | |
1201 | if ((cp = getenv("LD_LIBRARYN32_PATH")) != NULL) | |
1202 | child_set_env(&env, &envsize, "LD_LIBRARYN32_PATH",cp); | |
1203 | if ((cp = getenv("LD_LIBRARY64_PATH")) != NULL) | |
1204 | child_set_env(&env, &envsize, "LD_LIBRARY64_PATH",cp); | |
1205 | if ((cp = getenv("GLOBUS_LOCATION")) != NULL) | |
1206 | child_set_env(&env, &envsize, "GLOBUS_LOCATION",cp); | |
1207 | } | |
93f82cab | 1208 | #endif |
1209 | ||
3c0ef626 | 1210 | /* Set custom environment options from RSA authentication. */ |
1211 | if (!options.use_login) { | |
1212 | while (custom_environment) { | |
1213 | struct envstring *ce = custom_environment; | |
e54b3d7c | 1214 | char *str = ce->s; |
e9a17296 | 1215 | |
e54b3d7c | 1216 | for (i = 0; str[i] != '=' && str[i]; i++) |
3c0ef626 | 1217 | ; |
e54b3d7c | 1218 | if (str[i] == '=') { |
1219 | str[i] = 0; | |
1220 | child_set_env(&env, &envsize, str, str + i + 1); | |
3c0ef626 | 1221 | } |
1222 | custom_environment = ce->next; | |
1223 | xfree(ce->s); | |
1224 | xfree(ce); | |
1225 | } | |
1226 | } | |
1227 | ||
e54b3d7c | 1228 | /* SSH_CLIENT deprecated */ |
3c0ef626 | 1229 | snprintf(buf, sizeof buf, "%.50s %d %d", |
e9a17296 | 1230 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
3c0ef626 | 1231 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1232 | ||
1c14df9e | 1233 | laddr = get_local_ipaddr(packet_get_connection_in()); |
e54b3d7c | 1234 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
1c14df9e | 1235 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1236 | xfree(laddr); | |
e54b3d7c | 1237 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1238 | ||
3c0ef626 | 1239 | if (s->ttyfd != -1) |
1240 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1241 | if (s->term) | |
1242 | child_set_env(&env, &envsize, "TERM", s->term); | |
1243 | if (s->display) | |
1244 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
1245 | if (original_command) | |
1246 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1247 | original_command); | |
1248 | ||
e54b3d7c | 1249 | #ifdef _UNICOS |
1250 | if (cray_tmpdir[0] != '\0') | |
1251 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1252 | #endif /* _UNICOS */ | |
1253 | ||
3c0ef626 | 1254 | #ifdef _AIX |
e9a17296 | 1255 | { |
1256 | char *cp; | |
1257 | ||
1258 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1259 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1260 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1261 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1262 | read_environment_file(&env, &envsize, "/etc/environment"); | |
1263 | } | |
3c0ef626 | 1264 | #endif |
3c0ef626 | 1265 | #ifdef KRB5 |
2a304a95 | 1266 | if (s->authctxt->krb5_ccname) |
3c0ef626 | 1267 | child_set_env(&env, &envsize, "KRB5CCNAME", |
2a304a95 | 1268 | s->authctxt->krb5_ccname); |
3c0ef626 | 1269 | #endif |
1270 | #ifdef USE_PAM | |
e54b3d7c | 1271 | /* |
1272 | * Pull in any environment variables that may have | |
1273 | * been set by PAM. | |
1274 | */ | |
70791e56 | 1275 | if (options.use_pam) { |
416fd2a8 | 1276 | char **p; |
1277 | ||
1278 | p = fetch_pam_child_environment(); | |
1279 | copy_environment(p, &env, &envsize); | |
1280 | free_pam_environment(p); | |
e54b3d7c | 1281 | |
416fd2a8 | 1282 | p = fetch_pam_environment(); |
e54b3d7c | 1283 | copy_environment(p, &env, &envsize); |
1284 | free_pam_environment(p); | |
1285 | } | |
3c0ef626 | 1286 | #endif /* USE_PAM */ |
1287 | ||
ff2d7a98 | 1288 | if (auth_sock_name != NULL) |
3c0ef626 | 1289 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
ff2d7a98 | 1290 | auth_sock_name); |
3c0ef626 | 1291 | |
1292 | /* read $HOME/.ssh/environment. */ | |
e54b3d7c | 1293 | if (options.permit_user_env && !options.use_login) { |
3c0ef626 | 1294 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e54b3d7c | 1295 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
3c0ef626 | 1296 | read_environment_file(&env, &envsize, buf); |
1297 | } | |
1298 | if (debug_flag) { | |
1299 | /* dump the environment */ | |
1300 | fprintf(stderr, "Environment:\n"); | |
1301 | for (i = 0; env[i]; i++) | |
1302 | fprintf(stderr, " %.200s\n", env[i]); | |
1303 | } | |
e9a17296 | 1304 | return env; |
1305 | } | |
1306 | ||
1307 | /* | |
1308 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1309 | * first in this order). | |
1310 | */ | |
1311 | static void | |
1312 | do_rc_files(Session *s, const char *shell) | |
1313 | { | |
1314 | FILE *f = NULL; | |
1315 | char cmd[1024]; | |
1316 | int do_xauth; | |
1317 | struct stat st; | |
1318 | ||
1319 | do_xauth = | |
1320 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1321 | ||
1322 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1323 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1324 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1325 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1326 | if (debug_flag) | |
1327 | fprintf(stderr, "Running %s\n", cmd); | |
1328 | f = popen(cmd, "w"); | |
1329 | if (f) { | |
1330 | if (do_xauth) | |
1331 | fprintf(f, "%s %s\n", s->auth_proto, | |
1332 | s->auth_data); | |
1333 | pclose(f); | |
1334 | } else | |
1335 | fprintf(stderr, "Could not run %s\n", | |
1336 | _PATH_SSH_USER_RC); | |
1337 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
ae43c103 | 1338 | snprintf(cmd, sizeof cmd, "%s %s", _PATH_BSHELL, |
1339 | _PATH_SSH_SYSTEM_RC); | |
e9a17296 | 1340 | if (debug_flag) |
ae43c103 | 1341 | fprintf(stderr, "Running %s\n", cmd); |
1342 | f = popen(cmd, "w"); | |
e9a17296 | 1343 | if (f) { |
1344 | if (do_xauth) | |
1345 | fprintf(f, "%s %s\n", s->auth_proto, | |
1346 | s->auth_data); | |
1347 | pclose(f); | |
1348 | } else | |
1349 | fprintf(stderr, "Could not run %s\n", | |
1350 | _PATH_SSH_SYSTEM_RC); | |
1351 | } else if (do_xauth && options.xauth_location != NULL) { | |
1352 | /* Add authority data to .Xauthority if appropriate. */ | |
1353 | if (debug_flag) { | |
1354 | fprintf(stderr, | |
1c14df9e | 1355 | "Running %.500s remove %.100s\n", |
416fd2a8 | 1356 | options.xauth_location, s->auth_display); |
1c14df9e | 1357 | fprintf(stderr, |
1358 | "%.500s add %.100s %.100s %.100s\n", | |
e9a17296 | 1359 | options.xauth_location, s->auth_display, |
1360 | s->auth_proto, s->auth_data); | |
1361 | } | |
1362 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1363 | options.xauth_location); | |
1364 | f = popen(cmd, "w"); | |
1365 | if (f) { | |
1c14df9e | 1366 | fprintf(f, "remove %s\n", |
1367 | s->auth_display); | |
e9a17296 | 1368 | fprintf(f, "add %s %s %s\n", |
1369 | s->auth_display, s->auth_proto, | |
1370 | s->auth_data); | |
1371 | pclose(f); | |
1372 | } else { | |
1373 | fprintf(stderr, "Could not run %s\n", | |
1374 | cmd); | |
1375 | } | |
1376 | } | |
1377 | } | |
1378 | ||
1379 | static void | |
1380 | do_nologin(struct passwd *pw) | |
1381 | { | |
1382 | FILE *f = NULL; | |
1383 | char buf[1024]; | |
1384 | ||
1385 | #ifdef HAVE_LOGIN_CAP | |
1386 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1387 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1388 | _PATH_NOLOGIN), "r"); | |
1389 | #else | |
1390 | if (pw->pw_uid) | |
1391 | f = fopen(_PATH_NOLOGIN, "r"); | |
1392 | #endif | |
1393 | if (f) { | |
1394 | /* /etc/nologin exists. Print its contents and exit. */ | |
70791e56 | 1395 | logit("User %.100s not allowed because %s exists", |
e54b3d7c | 1396 | pw->pw_name, _PATH_NOLOGIN); |
e9a17296 | 1397 | while (fgets(buf, sizeof(buf), f)) |
1398 | fputs(buf, stderr); | |
1399 | fclose(f); | |
1c14df9e | 1400 | fflush(NULL); |
e9a17296 | 1401 | exit(254); |
1402 | } | |
1403 | } | |
1404 | ||
1405 | /* Set login name, uid, gid, and groups. */ | |
2980ea68 | 1406 | void |
e9a17296 | 1407 | do_setusercontext(struct passwd *pw) |
1408 | { | |
1c14df9e | 1409 | #ifndef HAVE_CYGWIN |
1410 | if (getuid() == 0 || geteuid() == 0) | |
e9a17296 | 1411 | #endif /* HAVE_CYGWIN */ |
1c14df9e | 1412 | { |
1413 | ||
ff2d7a98 | 1414 | #ifdef HAVE_SETPCRED |
70791e56 | 1415 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1416 | fatal("Failed to set process credentials"); | |
ff2d7a98 | 1417 | #endif /* HAVE_SETPCRED */ |
e9a17296 | 1418 | #ifdef HAVE_LOGIN_CAP |
e54b3d7c | 1419 | # ifdef __bsdi__ |
ff2d7a98 | 1420 | setpgid(0, 0); |
e54b3d7c | 1421 | # endif |
416fd2a8 | 1422 | # ifdef USE_PAM |
1423 | if (options.use_pam) { | |
1424 | do_pam_session(); | |
1425 | do_pam_setcred(0); | |
1426 | } | |
1427 | # endif /* USE_PAM */ | |
e9a17296 | 1428 | if (setusercontext(lc, pw, pw->pw_uid, |
1429 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1430 | perror("unable to set user context"); | |
1431 | exit(1); | |
1432 | } | |
1433 | #else | |
1434 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1435 | /* Sets login uid for accounting */ | |
1436 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1437 | error("setluid: %s", strerror(errno)); | |
1438 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1439 | ||
1440 | if (setlogin(pw->pw_name) < 0) | |
1441 | error("setlogin failed: %s", strerror(errno)); | |
1442 | if (setgid(pw->pw_gid) < 0) { | |
1443 | perror("setgid"); | |
1444 | exit(1); | |
1445 | } | |
1446 | /* Initialize the group list. */ | |
1447 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1448 | perror("initgroups"); | |
1449 | exit(1); | |
1450 | } | |
1451 | endgrent(); | |
1452 | # ifdef USE_PAM | |
1453 | /* | |
416fd2a8 | 1454 | * PAM credentials may take the form of supplementary groups. |
e9a17296 | 1455 | * These will have been wiped by the above initgroups() call. |
1456 | * Reestablish them here. | |
1457 | */ | |
70791e56 | 1458 | if (options.use_pam) { |
1459 | do_pam_session(); | |
1460 | do_pam_setcred(0); | |
1461 | } | |
e9a17296 | 1462 | # endif /* USE_PAM */ |
1463 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1464 | irix_setusercontext(pw); | |
1465 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
ff2d7a98 | 1466 | # ifdef _AIX |
e54b3d7c | 1467 | aix_usrinfo(pw); |
ff2d7a98 | 1468 | # endif /* _AIX */ |
e9a17296 | 1469 | /* Permanently switch to the desired uid. */ |
1470 | permanently_set_uid(pw); | |
1471 | #endif | |
1472 | } | |
1c14df9e | 1473 | |
1474 | #ifdef HAVE_CYGWIN | |
1475 | if (is_winnt) | |
1476 | #endif | |
e9a17296 | 1477 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1478 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1479 | } | |
1480 | ||
416fd2a8 | 1481 | static void |
1482 | do_pwchange(Session *s) | |
1483 | { | |
1b56ff3d | 1484 | fflush(NULL); |
416fd2a8 | 1485 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1486 | if (s->ttyfd != -1) { | |
1b56ff3d | 1487 | fprintf(stderr, |
416fd2a8 | 1488 | "You must change your password now and login again!\n"); |
1489 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); | |
1490 | perror("passwd"); | |
1491 | } else { | |
1492 | fprintf(stderr, | |
1493 | "Password change required but no TTY available.\n"); | |
1494 | } | |
1495 | exit(1); | |
1496 | } | |
1497 | ||
2980ea68 | 1498 | static void |
1499 | launch_login(struct passwd *pw, const char *hostname) | |
1500 | { | |
1501 | /* Launch login(1). */ | |
1502 | ||
ff2d7a98 | 1503 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
2980ea68 | 1504 | #ifdef xxxLOGIN_NEEDS_TERM |
ff2d7a98 | 1505 | (s->term ? s->term : "unknown"), |
2980ea68 | 1506 | #endif /* LOGIN_NEEDS_TERM */ |
1507 | #ifdef LOGIN_NO_ENDOPT | |
1508 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1509 | #else | |
1510 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1511 | #endif | |
1512 | ||
1513 | /* Login couldn't be executed, die. */ | |
1514 | ||
1515 | perror("login"); | |
1516 | exit(1); | |
1517 | } | |
1518 | ||
416fd2a8 | 1519 | static void |
1520 | child_close_fds(void) | |
1521 | { | |
1522 | int i; | |
1523 | ||
1524 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1525 | close(packet_get_connection_in()); | |
1526 | else { | |
1527 | close(packet_get_connection_in()); | |
1528 | close(packet_get_connection_out()); | |
1529 | } | |
1530 | /* | |
1531 | * Close all descriptors related to channels. They will still remain | |
1532 | * open in the parent. | |
1533 | */ | |
1534 | /* XXX better use close-on-exec? -markus */ | |
1535 | channel_close_all(); | |
1536 | ||
1537 | /* | |
1538 | * Close any extra file descriptors. Note that there may still be | |
1539 | * descriptors left by system functions. They will be closed later. | |
1540 | */ | |
1541 | endpwent(); | |
1542 | ||
1543 | /* | |
1544 | * Close any extra open file descriptors so that we don\'t have them | |
1545 | * hanging around in clients. Note that we want to do this after | |
1546 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1547 | * descriptors open. | |
1548 | */ | |
1549 | for (i = 3; i < 64; i++) | |
1550 | close(i); | |
1551 | } | |
1552 | ||
e9a17296 | 1553 | /* |
1554 | * Performs common processing for the child, such as setting up the | |
1555 | * environment, closing extra file descriptors, setting the user and group | |
1556 | * ids, and executing the command or shell. | |
1557 | */ | |
1558 | void | |
1559 | do_child(Session *s, const char *command) | |
1560 | { | |
1561 | extern char **environ; | |
1562 | char **env; | |
1563 | char *argv[10]; | |
1564 | const char *shell, *shell0, *hostname = NULL; | |
1565 | struct passwd *pw = s->pw; | |
e9a17296 | 1566 | |
f2fd21a2 | 1567 | #ifdef AFS_KRB5 |
1568 | /* Default place to look for aklog. */ | |
1569 | #ifdef AKLOG_PATH | |
1570 | #define KPROGDIR AKLOG_PATH | |
1571 | #else | |
1572 | #define KPROGDIR "/usr/bin/aklog" | |
1573 | #endif /* AKLOG_PATH */ | |
1574 | ||
1575 | struct stat st; | |
1576 | char *aklog_path; | |
1577 | #endif /* AFS_KRB5 */ | |
1578 | ||
e9a17296 | 1579 | /* remove hostkey from the child's memory */ |
1580 | destroy_sensitive_data(); | |
1581 | ||
416fd2a8 | 1582 | /* Force a password change */ |
1583 | if (s->authctxt->force_pwchange) { | |
1584 | do_setusercontext(pw); | |
1585 | child_close_fds(); | |
1586 | do_pwchange(s); | |
1587 | exit(1); | |
1588 | } | |
1589 | ||
e9a17296 | 1590 | /* login(1) is only called if we execute the login shell */ |
1591 | if (options.use_login && command != NULL) | |
1592 | options.use_login = 0; | |
1593 | ||
e54b3d7c | 1594 | #ifdef _UNICOS |
1595 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1596 | #endif /* _UNICOS */ | |
1597 | ||
e9a17296 | 1598 | /* |
1599 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1600 | * switch, so we let login(1) to this for us. | |
1601 | */ | |
1602 | if (!options.use_login) { | |
1603 | #ifdef HAVE_OSF_SIA | |
1c14df9e | 1604 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
e9a17296 | 1605 | if (!check_quietlogin(s, command)) |
1606 | do_motd(); | |
1607 | #else /* HAVE_OSF_SIA */ | |
1608 | do_nologin(pw); | |
e9a17296 | 1609 | do_setusercontext(pw); |
1b56ff3d | 1610 | /* |
1611 | * PAM session modules in do_setusercontext may have | |
1612 | * generated messages, so if this in an interactive | |
1613 | * login then display them too. | |
1614 | */ | |
1615 | if (command == NULL) | |
1616 | display_loginmsg(); | |
e9a17296 | 1617 | #endif /* HAVE_OSF_SIA */ |
1618 | } | |
1619 | ||
1620 | /* | |
1621 | * Get the shell from the password data. An empty shell field is | |
1622 | * legal, and means /bin/sh. | |
1623 | */ | |
1624 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
1c14df9e | 1625 | |
1626 | /* | |
1627 | * Make sure $SHELL points to the shell from the password file, | |
1628 | * even if shell is overridden from login.conf | |
1629 | */ | |
1630 | env = do_setup_env(s, shell); | |
1631 | ||
e9a17296 | 1632 | #ifdef HAVE_LOGIN_CAP |
1633 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1634 | #endif | |
1635 | ||
3c0ef626 | 1636 | /* we have to stash the hostname before we close our socket. */ |
1637 | if (options.use_login) | |
1638 | hostname = get_remote_name_or_ip(utmp_len, | |
70791e56 | 1639 | options.use_dns); |
3c0ef626 | 1640 | /* |
1641 | * Close the connection descriptors; note that this is the child, and | |
1642 | * the server will still have the socket open, and it is important | |
1643 | * that we do not shutdown it. Note that the descriptors cannot be | |
1644 | * closed before building the environment, as we call | |
1645 | * get_remote_ipaddr there. | |
1646 | */ | |
416fd2a8 | 1647 | child_close_fds(); |
3c0ef626 | 1648 | |
1649 | /* | |
416fd2a8 | 1650 | * Must take new environment into use so that .ssh/rc, |
1651 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
3c0ef626 | 1652 | */ |
416fd2a8 | 1653 | environ = env; |
3c0ef626 | 1654 | |
416fd2a8 | 1655 | #if defined(KRB5) && defined(USE_AFS) |
3c0ef626 | 1656 | /* |
416fd2a8 | 1657 | * At this point, we check to see if AFS is active and if we have |
1658 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1659 | * if we can (and need to) extend the ticket into an AFS token. If | |
1660 | * we don't do this, we run into potential problems if the user's | |
1661 | * home directory is in AFS and it's not world-readable. | |
3c0ef626 | 1662 | */ |
3c0ef626 | 1663 | |
416fd2a8 | 1664 | if (options.kerberos_get_afs_token && k_hasafs() && |
1665 | (s->authctxt->krb5_ctx != NULL)) { | |
1666 | char cell[64]; | |
1667 | ||
1668 | debug("Getting AFS token"); | |
1669 | ||
1670 | k_setpag(); | |
1671 | ||
1672 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1673 | krb5_afslog(s->authctxt->krb5_ctx, | |
1674 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1675 | ||
1676 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1677 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1678 | } | |
1679 | #endif | |
3c0ef626 | 1680 | |
f2fd21a2 | 1681 | #ifdef AFS_KRB5 |
1682 | ||
1683 | /* User has authenticated, and if a ticket was going to be | |
1684 | * passed we would have it. KRB5CCNAME should already be set. | |
1685 | * Now try to get an AFS token using aklog. | |
1686 | */ | |
1687 | if (k_hasafs()) { /* Do we have AFS? */ | |
1688 | ||
1689 | aklog_path = xstrdup(KPROGDIR); | |
1690 | ||
1691 | /* | |
1692 | * Make sure it exists before we try to run it | |
1693 | */ | |
1694 | if (stat(aklog_path, &st) == 0) { | |
1695 | debug("Running %s to get afs token.",aklog_path); | |
1696 | system(aklog_path); | |
1697 | } else { | |
1698 | debug("%s does not exist.",aklog_path); | |
1699 | } | |
1700 | ||
1701 | xfree(aklog_path); | |
1702 | } | |
1703 | #endif /* AFS_KRB5 */ | |
1704 | ||
88928908 | 1705 | #ifdef SESSION_HOOKS |
1706 | if (options.session_hooks_allow && | |
1707 | options.session_hooks_startup_cmd) | |
1708 | { | |
1709 | execute_session_hook(options.session_hooks_startup_cmd, | |
1710 | s->authctxt, | |
1711 | /* startup = */ 1, | |
1712 | options.session_hooks_shutdown_cmd != NULL); | |
1713 | } | |
1714 | #endif | |
3c0ef626 | 1715 | |
1716 | /* Change current directory to the user\'s home directory. */ | |
1717 | if (chdir(pw->pw_dir) < 0) { | |
1718 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1719 | pw->pw_dir, strerror(errno)); | |
1720 | #ifdef HAVE_LOGIN_CAP | |
1721 | if (login_getcapbool(lc, "requirehome", 0)) | |
1722 | exit(1); | |
1723 | #endif | |
1724 | } | |
1725 | ||
e9a17296 | 1726 | if (!options.use_login) |
1727 | do_rc_files(s, shell); | |
3c0ef626 | 1728 | |
1729 | /* restore SIGPIPE for child */ | |
1730 | signal(SIGPIPE, SIG_DFL); | |
1731 | ||
e9a17296 | 1732 | if (options.use_login) { |
2980ea68 | 1733 | launch_login(pw, hostname); |
1734 | /* NEVERREACHED */ | |
e9a17296 | 1735 | } |
1736 | ||
1737 | /* Get the last component of the shell name. */ | |
1738 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1739 | shell0++; | |
1740 | else | |
1741 | shell0 = shell; | |
1742 | ||
3c0ef626 | 1743 | /* |
1744 | * If we have no command, execute the shell. In this case, the shell | |
1745 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1746 | * this is a login shell. | |
1747 | */ | |
1748 | if (!command) { | |
e9a17296 | 1749 | char argv0[256]; |
3c0ef626 | 1750 | |
e9a17296 | 1751 | /* Start the shell. Set initial character to '-'. */ |
1752 | argv0[0] = '-'; | |
3c0ef626 | 1753 | |
e9a17296 | 1754 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1755 | >= sizeof(argv0) - 1) { | |
1756 | errno = EINVAL; | |
3c0ef626 | 1757 | perror(shell); |
1758 | exit(1); | |
e9a17296 | 1759 | } |
3c0ef626 | 1760 | |
e9a17296 | 1761 | /* Execute the shell. */ |
1762 | argv[0] = argv0; | |
1763 | argv[1] = NULL; | |
574478c5 | 1764 | execve(shell, argv, environ); |
3c0ef626 | 1765 | |
e9a17296 | 1766 | /* Executing the shell failed. */ |
1767 | perror(shell); | |
1768 | exit(1); | |
3c0ef626 | 1769 | } |
1770 | /* | |
1771 | * Execute the command using the user's shell. This uses the -c | |
1772 | * option to execute the command. | |
1773 | */ | |
e9a17296 | 1774 | argv[0] = (char *) shell0; |
3c0ef626 | 1775 | argv[1] = "-c"; |
1776 | argv[2] = (char *) command; | |
1777 | argv[3] = NULL; | |
574478c5 | 1778 | execve(shell, argv, environ); |
3c0ef626 | 1779 | perror(shell); |
1780 | exit(1); | |
1781 | } | |
1782 | ||
1783 | Session * | |
1784 | session_new(void) | |
1785 | { | |
1786 | int i; | |
1787 | static int did_init = 0; | |
1788 | if (!did_init) { | |
1789 | debug("session_new: init"); | |
e9a17296 | 1790 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1791 | sessions[i].used = 0; |
1792 | } | |
1793 | did_init = 1; | |
1794 | } | |
e9a17296 | 1795 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1796 | Session *s = &sessions[i]; |
1797 | if (! s->used) { | |
1798 | memset(s, 0, sizeof(*s)); | |
1799 | s->chanid = -1; | |
1800 | s->ptyfd = -1; | |
1801 | s->ttyfd = -1; | |
1802 | s->used = 1; | |
1803 | s->self = i; | |
1804 | debug("session_new: session %d", i); | |
1805 | return s; | |
1806 | } | |
1807 | } | |
1808 | return NULL; | |
1809 | } | |
1810 | ||
1811 | static void | |
1812 | session_dump(void) | |
1813 | { | |
1814 | int i; | |
e9a17296 | 1815 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1816 | Session *s = &sessions[i]; |
ff2d7a98 | 1817 | debug("dump: used %d session %d %p channel %d pid %ld", |
3c0ef626 | 1818 | s->used, |
1819 | s->self, | |
1820 | s, | |
1821 | s->chanid, | |
ff2d7a98 | 1822 | (long)s->pid); |
3c0ef626 | 1823 | } |
1824 | } | |
1825 | ||
1826 | int | |
1827 | session_open(Authctxt *authctxt, int chanid) | |
1828 | { | |
1829 | Session *s = session_new(); | |
1830 | debug("session_open: channel %d", chanid); | |
1831 | if (s == NULL) { | |
1832 | error("no more sessions"); | |
1833 | return 0; | |
1834 | } | |
1835 | s->authctxt = authctxt; | |
1836 | s->pw = authctxt->pw; | |
416fd2a8 | 1837 | if (s->pw == NULL || !authctxt->valid) |
3c0ef626 | 1838 | fatal("no user for session %d", s->self); |
1839 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1840 | s->chanid = chanid; | |
1841 | return 1; | |
1842 | } | |
1843 | ||
2980ea68 | 1844 | Session * |
1845 | session_by_tty(char *tty) | |
1846 | { | |
1847 | int i; | |
1848 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1849 | Session *s = &sessions[i]; | |
1850 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1851 | debug("session_by_tty: session %d tty %s", i, tty); | |
1852 | return s; | |
1853 | } | |
1854 | } | |
1855 | debug("session_by_tty: unknown tty %.100s", tty); | |
1856 | session_dump(); | |
1857 | return NULL; | |
1858 | } | |
1859 | ||
3c0ef626 | 1860 | static Session * |
1861 | session_by_channel(int id) | |
1862 | { | |
1863 | int i; | |
e9a17296 | 1864 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1865 | Session *s = &sessions[i]; |
1866 | if (s->used && s->chanid == id) { | |
1867 | debug("session_by_channel: session %d channel %d", i, id); | |
1868 | return s; | |
1869 | } | |
1870 | } | |
1871 | debug("session_by_channel: unknown channel %d", id); | |
1872 | session_dump(); | |
1873 | return NULL; | |
1874 | } | |
1875 | ||
1876 | static Session * | |
1877 | session_by_pid(pid_t pid) | |
1878 | { | |
1879 | int i; | |
ff2d7a98 | 1880 | debug("session_by_pid: pid %ld", (long)pid); |
e9a17296 | 1881 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1882 | Session *s = &sessions[i]; |
1883 | if (s->used && s->pid == pid) | |
1884 | return s; | |
1885 | } | |
ff2d7a98 | 1886 | error("session_by_pid: unknown pid %ld", (long)pid); |
3c0ef626 | 1887 | session_dump(); |
1888 | return NULL; | |
1889 | } | |
1890 | ||
1891 | static int | |
1892 | session_window_change_req(Session *s) | |
1893 | { | |
1894 | s->col = packet_get_int(); | |
1895 | s->row = packet_get_int(); | |
1896 | s->xpixel = packet_get_int(); | |
1897 | s->ypixel = packet_get_int(); | |
e9a17296 | 1898 | packet_check_eom(); |
3c0ef626 | 1899 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1900 | return 1; | |
1901 | } | |
1902 | ||
1903 | static int | |
1904 | session_pty_req(Session *s) | |
1905 | { | |
1906 | u_int len; | |
1907 | int n_bytes; | |
1908 | ||
1909 | if (no_pty_flag) { | |
1910 | debug("Allocating a pty not permitted for this authentication."); | |
1911 | return 0; | |
1912 | } | |
1913 | if (s->ttyfd != -1) { | |
1914 | packet_disconnect("Protocol error: you already have a pty."); | |
1915 | return 0; | |
1916 | } | |
1917 | ||
1918 | s->term = packet_get_string(&len); | |
1919 | ||
1920 | if (compat20) { | |
1921 | s->col = packet_get_int(); | |
1922 | s->row = packet_get_int(); | |
1923 | } else { | |
1924 | s->row = packet_get_int(); | |
1925 | s->col = packet_get_int(); | |
1926 | } | |
1927 | s->xpixel = packet_get_int(); | |
1928 | s->ypixel = packet_get_int(); | |
1929 | ||
1930 | if (strcmp(s->term, "") == 0) { | |
1931 | xfree(s->term); | |
1932 | s->term = NULL; | |
1933 | } | |
1934 | ||
1935 | /* Allocate a pty and open it. */ | |
1936 | debug("Allocating pty."); | |
2980ea68 | 1937 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
3c0ef626 | 1938 | if (s->term) |
1939 | xfree(s->term); | |
1940 | s->term = NULL; | |
1941 | s->ptyfd = -1; | |
1942 | s->ttyfd = -1; | |
1943 | error("session_pty_req: session %d alloc failed", s->self); | |
1944 | return 0; | |
1945 | } | |
1946 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1947 | ||
1948 | /* for SSH1 the tty modes length is not given */ | |
1949 | if (!compat20) | |
1950 | n_bytes = packet_remaining(); | |
1951 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1952 | ||
2980ea68 | 1953 | if (!use_privsep) |
1954 | pty_setowner(s->pw, s->tty); | |
3c0ef626 | 1955 | |
1956 | /* Set window size from the packet. */ | |
1957 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1958 | ||
e9a17296 | 1959 | packet_check_eom(); |
3c0ef626 | 1960 | session_proctitle(s); |
1961 | return 1; | |
1962 | } | |
1963 | ||
1964 | static int | |
1965 | session_subsystem_req(Session *s) | |
1966 | { | |
1967 | struct stat st; | |
1968 | u_int len; | |
1969 | int success = 0; | |
1970 | char *cmd, *subsys = packet_get_string(&len); | |
1971 | int i; | |
1972 | ||
e9a17296 | 1973 | packet_check_eom(); |
70791e56 | 1974 | logit("subsystem request for %.100s", subsys); |
3c0ef626 | 1975 | |
1976 | for (i = 0; i < options.num_subsystems; i++) { | |
1977 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1978 | cmd = options.subsystem_command[i]; | |
1979 | if (stat(cmd, &st) < 0) { | |
1980 | error("subsystem: cannot stat %s: %s", cmd, | |
1981 | strerror(errno)); | |
1982 | break; | |
1983 | } | |
1984 | debug("subsystem: exec() %s", cmd); | |
1985 | s->is_subsystem = 1; | |
1986 | do_exec(s, cmd); | |
1987 | success = 1; | |
e9a17296 | 1988 | break; |
3c0ef626 | 1989 | } |
1990 | } | |
1991 | ||
1992 | if (!success) | |
70791e56 | 1993 | logit("subsystem request for %.100s failed, subsystem not found", |
3c0ef626 | 1994 | subsys); |
1995 | ||
1996 | xfree(subsys); | |
1997 | return success; | |
1998 | } | |
1999 | ||
2000 | static int | |
2001 | session_x11_req(Session *s) | |
2002 | { | |
2003 | int success; | |
2004 | ||
2005 | s->single_connection = packet_get_char(); | |
2006 | s->auth_proto = packet_get_string(NULL); | |
2007 | s->auth_data = packet_get_string(NULL); | |
2008 | s->screen = packet_get_int(); | |
e9a17296 | 2009 | packet_check_eom(); |
3c0ef626 | 2010 | |
2011 | success = session_setup_x11fwd(s); | |
2012 | if (!success) { | |
2013 | xfree(s->auth_proto); | |
2014 | xfree(s->auth_data); | |
2015 | s->auth_proto = NULL; | |
2016 | s->auth_data = NULL; | |
2017 | } | |
2018 | return success; | |
2019 | } | |
2020 | ||
2021 | static int | |
2022 | session_shell_req(Session *s) | |
2023 | { | |
e9a17296 | 2024 | packet_check_eom(); |
3c0ef626 | 2025 | do_exec(s, NULL); |
2026 | return 1; | |
2027 | } | |
2028 | ||
2029 | static int | |
2030 | session_exec_req(Session *s) | |
2031 | { | |
2032 | u_int len; | |
2033 | char *command = packet_get_string(&len); | |
e9a17296 | 2034 | packet_check_eom(); |
3c0ef626 | 2035 | do_exec(s, command); |
2036 | xfree(command); | |
2037 | return 1; | |
2038 | } | |
2039 | ||
70791e56 | 2040 | static int |
2041 | session_break_req(Session *s) | |
2042 | { | |
70791e56 | 2043 | |
1b56ff3d | 2044 | packet_get_int(); /* ignored */ |
70791e56 | 2045 | packet_check_eom(); |
2046 | ||
2047 | if (s->ttyfd == -1 || | |
2048 | tcsendbreak(s->ttyfd, 0) < 0) | |
2049 | return 0; | |
2050 | return 1; | |
2051 | } | |
2052 | ||
1b56ff3d | 2053 | static int |
2054 | session_env_req(Session *s) | |
2055 | { | |
2056 | char *name, *val; | |
2057 | u_int name_len, val_len, i; | |
2058 | ||
2059 | name = packet_get_string(&name_len); | |
2060 | val = packet_get_string(&val_len); | |
2061 | packet_check_eom(); | |
2062 | ||
2063 | /* Don't set too many environment variables */ | |
2064 | if (s->num_env > 128) { | |
2065 | debug2("Ignoring env request %s: too many env vars", name); | |
2066 | goto fail; | |
2067 | } | |
2068 | ||
2069 | for (i = 0; i < options.num_accept_env; i++) { | |
2070 | if (match_pattern(name, options.accept_env[i])) { | |
2071 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
2072 | s->env = xrealloc(s->env, sizeof(*s->env) * | |
2073 | (s->num_env + 1)); | |
2074 | s->env[s->num_env].name = name; | |
2075 | s->env[s->num_env].val = val; | |
2076 | s->num_env++; | |
2077 | return (1); | |
2078 | } | |
2079 | } | |
2080 | debug2("Ignoring env request %s: disallowed name", name); | |
2081 | ||
2082 | fail: | |
2083 | xfree(name); | |
2084 | xfree(val); | |
2085 | return (0); | |
2086 | } | |
2087 | ||
3c0ef626 | 2088 | static int |
2089 | session_auth_agent_req(Session *s) | |
2090 | { | |
2091 | static int called = 0; | |
e9a17296 | 2092 | packet_check_eom(); |
3c0ef626 | 2093 | if (no_agent_forwarding_flag) { |
2094 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
2095 | return 0; | |
2096 | } | |
2097 | if (called) { | |
2098 | return 0; | |
2099 | } else { | |
2100 | called = 1; | |
2101 | return auth_input_request_forwarding(s->pw); | |
2102 | } | |
2103 | } | |
2104 | ||
e9a17296 | 2105 | int |
2106 | session_input_channel_req(Channel *c, const char *rtype) | |
3c0ef626 | 2107 | { |
3c0ef626 | 2108 | int success = 0; |
3c0ef626 | 2109 | Session *s; |
3c0ef626 | 2110 | |
e9a17296 | 2111 | if ((s = session_by_channel(c->self)) == NULL) { |
70791e56 | 2112 | logit("session_input_channel_req: no session %d req %.100s", |
e9a17296 | 2113 | c->self, rtype); |
2114 | return 0; | |
2115 | } | |
2116 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
3c0ef626 | 2117 | |
2118 | /* | |
2119 | * a session is in LARVAL state until a shell, a command | |
2120 | * or a subsystem is executed | |
2121 | */ | |
2122 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2123 | if (strcmp(rtype, "shell") == 0) { | |
2124 | success = session_shell_req(s); | |
2125 | } else if (strcmp(rtype, "exec") == 0) { | |
2126 | success = session_exec_req(s); | |
2127 | } else if (strcmp(rtype, "pty-req") == 0) { | |
2128 | success = session_pty_req(s); | |
2129 | } else if (strcmp(rtype, "x11-req") == 0) { | |
2130 | success = session_x11_req(s); | |
2131 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { | |
2132 | success = session_auth_agent_req(s); | |
2133 | } else if (strcmp(rtype, "subsystem") == 0) { | |
2134 | success = session_subsystem_req(s); | |
1b56ff3d | 2135 | } else if (strcmp(rtype, "env") == 0) { |
2136 | success = session_env_req(s); | |
3c0ef626 | 2137 | } |
2138 | } | |
2139 | if (strcmp(rtype, "window-change") == 0) { | |
2140 | success = session_window_change_req(s); | |
1b56ff3d | 2141 | } else if (strcmp(rtype, "break") == 0) { |
2142 | success = session_break_req(s); | |
3c0ef626 | 2143 | } |
1b56ff3d | 2144 | |
e9a17296 | 2145 | return success; |
3c0ef626 | 2146 | } |
2147 | ||
2148 | void | |
2149 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2150 | { | |
2151 | if (!compat20) | |
2152 | fatal("session_set_fds: called for proto != 2.0"); | |
2153 | /* | |
2154 | * now that have a child and a pipe to the child, | |
2155 | * we can activate our channel and register the fd's | |
2156 | */ | |
2157 | if (s->chanid == -1) | |
2158 | fatal("no channel for session %d", s->self); | |
2159 | channel_set_fds(s->chanid, | |
2160 | fdout, fdin, fderr, | |
2161 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
e9a17296 | 2162 | 1, |
2163 | CHAN_SES_WINDOW_DEFAULT); | |
3c0ef626 | 2164 | } |
2165 | ||
2166 | /* | |
2167 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2168 | * (e.g., due to a dropped connection). | |
2169 | */ | |
2980ea68 | 2170 | void |
416fd2a8 | 2171 | session_pty_cleanup2(Session *s) |
3c0ef626 | 2172 | { |
3c0ef626 | 2173 | if (s == NULL) { |
2174 | error("session_pty_cleanup: no session"); | |
2175 | return; | |
2176 | } | |
2177 | if (s->ttyfd == -1) | |
2178 | return; | |
2179 | ||
2180 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); | |
2181 | ||
2182 | /* Record that the user has logged out. */ | |
2183 | if (s->pid != 0) | |
e9a17296 | 2184 | record_logout(s->pid, s->tty, s->pw->pw_name); |
3c0ef626 | 2185 | |
2186 | /* Release the pseudo-tty. */ | |
2980ea68 | 2187 | if (getuid() == 0) |
2188 | pty_release(s->tty); | |
3c0ef626 | 2189 | |
2190 | /* | |
2191 | * Close the server side of the socket pairs. We must do this after | |
2192 | * the pty cleanup, so that another process doesn't get this pty | |
2193 | * while we're still cleaning up. | |
2194 | */ | |
2195 | if (close(s->ptymaster) < 0) | |
2980ea68 | 2196 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
3c0ef626 | 2197 | |
2198 | /* unlink pty from session */ | |
2199 | s->ttyfd = -1; | |
2200 | } | |
2201 | ||
2980ea68 | 2202 | void |
416fd2a8 | 2203 | session_pty_cleanup(Session *s) |
2980ea68 | 2204 | { |
416fd2a8 | 2205 | PRIVSEP(session_pty_cleanup2(s)); |
2980ea68 | 2206 | } |
2207 | ||
e54b3d7c | 2208 | static char * |
2209 | sig2name(int sig) | |
2210 | { | |
2211 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2212 | SSH_SIG(ABRT); | |
2213 | SSH_SIG(ALRM); | |
2214 | SSH_SIG(FPE); | |
2215 | SSH_SIG(HUP); | |
2216 | SSH_SIG(ILL); | |
2217 | SSH_SIG(INT); | |
2218 | SSH_SIG(KILL); | |
2219 | SSH_SIG(PIPE); | |
2220 | SSH_SIG(QUIT); | |
2221 | SSH_SIG(SEGV); | |
2222 | SSH_SIG(TERM); | |
2223 | SSH_SIG(USR1); | |
2224 | SSH_SIG(USR2); | |
2225 | #undef SSH_SIG | |
2226 | return "SIG@openssh.com"; | |
2227 | } | |
2228 | ||
3c0ef626 | 2229 | static void |
2230 | session_exit_message(Session *s, int status) | |
2231 | { | |
2232 | Channel *c; | |
e9a17296 | 2233 | |
2234 | if ((c = channel_lookup(s->chanid)) == NULL) | |
3c0ef626 | 2235 | fatal("session_exit_message: session %d: no channel %d", |
2236 | s->self, s->chanid); | |
ff2d7a98 | 2237 | debug("session_exit_message: session %d channel %d pid %ld", |
2238 | s->self, s->chanid, (long)s->pid); | |
3c0ef626 | 2239 | |
2240 | if (WIFEXITED(status)) { | |
e9a17296 | 2241 | channel_request_start(s->chanid, "exit-status", 0); |
3c0ef626 | 2242 | packet_put_int(WEXITSTATUS(status)); |
2243 | packet_send(); | |
2244 | } else if (WIFSIGNALED(status)) { | |
e9a17296 | 2245 | channel_request_start(s->chanid, "exit-signal", 0); |
e54b3d7c | 2246 | packet_put_cstring(sig2name(WTERMSIG(status))); |
3c0ef626 | 2247 | #ifdef WCOREDUMP |
2248 | packet_put_char(WCOREDUMP(status)); | |
2249 | #else /* WCOREDUMP */ | |
2250 | packet_put_char(0); | |
2251 | #endif /* WCOREDUMP */ | |
2252 | packet_put_cstring(""); | |
2253 | packet_put_cstring(""); | |
2254 | packet_send(); | |
2255 | } else { | |
2256 | /* Some weird exit cause. Just exit. */ | |
2257 | packet_disconnect("wait returned status %04x.", status); | |
2258 | } | |
2259 | ||
2260 | /* disconnect channel */ | |
2261 | debug("session_exit_message: release channel %d", s->chanid); | |
2262 | channel_cancel_cleanup(s->chanid); | |
2263 | /* | |
2264 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2265 | * interested in data we write. | |
2266 | * Note that we must not call 'chan_read_failed', since there could | |
2267 | * be some more data waiting in the pipe. | |
2268 | */ | |
2269 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2270 | chan_write_failed(c); | |
2271 | s->chanid = -1; | |
2272 | } | |
2273 | ||
2980ea68 | 2274 | void |
3c0ef626 | 2275 | session_close(Session *s) |
2276 | { | |
1b56ff3d | 2277 | int i; |
2278 | ||
ff2d7a98 | 2279 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
416fd2a8 | 2280 | if (s->ttyfd != -1) |
3c0ef626 | 2281 | session_pty_cleanup(s); |
3c0ef626 | 2282 | if (s->term) |
2283 | xfree(s->term); | |
2284 | if (s->display) | |
2285 | xfree(s->display); | |
e9a17296 | 2286 | if (s->auth_display) |
2287 | xfree(s->auth_display); | |
3c0ef626 | 2288 | if (s->auth_data) |
2289 | xfree(s->auth_data); | |
2290 | if (s->auth_proto) | |
2291 | xfree(s->auth_proto); | |
2292 | s->used = 0; | |
1b56ff3d | 2293 | for (i = 0; i < s->num_env; i++) { |
2294 | xfree(s->env[i].name); | |
2295 | xfree(s->env[i].val); | |
2296 | } | |
2297 | if (s->env != NULL) | |
2298 | xfree(s->env); | |
3c0ef626 | 2299 | session_proctitle(s); |
2300 | } | |
2301 | ||
2302 | void | |
2303 | session_close_by_pid(pid_t pid, int status) | |
2304 | { | |
2305 | Session *s = session_by_pid(pid); | |
2306 | if (s == NULL) { | |
ff2d7a98 | 2307 | debug("session_close_by_pid: no session for pid %ld", |
2308 | (long)pid); | |
3c0ef626 | 2309 | return; |
2310 | } | |
2311 | if (s->chanid != -1) | |
2312 | session_exit_message(s, status); | |
2313 | session_close(s); | |
2314 | } | |
2315 | ||
2316 | /* | |
2317 | * this is called when a channel dies before | |
2318 | * the session 'child' itself dies | |
2319 | */ | |
2320 | void | |
2321 | session_close_by_channel(int id, void *arg) | |
2322 | { | |
2323 | Session *s = session_by_channel(id); | |
2324 | if (s == NULL) { | |
2325 | debug("session_close_by_channel: no session for id %d", id); | |
2326 | return; | |
2327 | } | |
ff2d7a98 | 2328 | debug("session_close_by_channel: channel %d child %ld", |
2329 | id, (long)s->pid); | |
3c0ef626 | 2330 | if (s->pid != 0) { |
2331 | debug("session_close_by_channel: channel %d: has child", id); | |
2332 | /* | |
2333 | * delay detach of session, but release pty, since | |
2334 | * the fd's to the child are already closed | |
2335 | */ | |
416fd2a8 | 2336 | if (s->ttyfd != -1) |
3c0ef626 | 2337 | session_pty_cleanup(s); |
3c0ef626 | 2338 | return; |
2339 | } | |
2340 | /* detach by removing callback */ | |
2341 | channel_cancel_cleanup(s->chanid); | |
2342 | s->chanid = -1; | |
2343 | session_close(s); | |
2344 | } | |
2345 | ||
2346 | void | |
2980ea68 | 2347 | session_destroy_all(void (*closefunc)(Session *)) |
3c0ef626 | 2348 | { |
2349 | int i; | |
e9a17296 | 2350 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2351 | Session *s = &sessions[i]; |
2980ea68 | 2352 | if (s->used) { |
2353 | if (closefunc != NULL) | |
2354 | closefunc(s); | |
2355 | else | |
2356 | session_close(s); | |
2357 | } | |
3c0ef626 | 2358 | } |
2359 | } | |
2360 | ||
2361 | static char * | |
2362 | session_tty_list(void) | |
2363 | { | |
2364 | static char buf[1024]; | |
2365 | int i; | |
1c14df9e | 2366 | char *cp; |
2367 | ||
3c0ef626 | 2368 | buf[0] = '\0'; |
e9a17296 | 2369 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2370 | Session *s = &sessions[i]; |
2371 | if (s->used && s->ttyfd != -1) { | |
416fd2a8 | 2372 | |
1c14df9e | 2373 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2374 | cp = strrchr(s->tty, '/'); | |
2375 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2376 | } else | |
2377 | cp = s->tty + 5; | |
416fd2a8 | 2378 | |
3c0ef626 | 2379 | if (buf[0] != '\0') |
2380 | strlcat(buf, ",", sizeof buf); | |
1c14df9e | 2381 | strlcat(buf, cp, sizeof buf); |
3c0ef626 | 2382 | } |
2383 | } | |
2384 | if (buf[0] == '\0') | |
2385 | strlcpy(buf, "notty", sizeof buf); | |
2386 | return buf; | |
2387 | } | |
2388 | ||
2389 | void | |
2390 | session_proctitle(Session *s) | |
2391 | { | |
2392 | if (s->pw == NULL) | |
2393 | error("no user for session %d", s->self); | |
2394 | else | |
2395 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2396 | } | |
2397 | ||
2398 | int | |
2399 | session_setup_x11fwd(Session *s) | |
2400 | { | |
2401 | struct stat st; | |
e9a17296 | 2402 | char display[512], auth_display[512]; |
2403 | char hostname[MAXHOSTNAMELEN]; | |
3c0ef626 | 2404 | |
2405 | if (no_x11_forwarding_flag) { | |
2406 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2407 | return 0; | |
2408 | } | |
2409 | if (!options.x11_forwarding) { | |
2410 | debug("X11 forwarding disabled in server configuration file."); | |
2411 | return 0; | |
2412 | } | |
2413 | if (!options.xauth_location || | |
2414 | (stat(options.xauth_location, &st) == -1)) { | |
2415 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2416 | return 0; | |
2417 | } | |
2418 | if (options.use_login) { | |
2419 | packet_send_debug("X11 forwarding disabled; " | |
2420 | "not compatible with UseLogin=yes."); | |
2421 | return 0; | |
2422 | } | |
2423 | if (s->display != NULL) { | |
2424 | debug("X11 display already set."); | |
2425 | return 0; | |
2426 | } | |
ff2d7a98 | 2427 | if (x11_create_display_inet(options.x11_display_offset, |
2428 | options.x11_use_localhost, s->single_connection, | |
2429 | &s->display_number) == -1) { | |
3c0ef626 | 2430 | debug("x11_create_display_inet failed."); |
2431 | return 0; | |
2432 | } | |
e9a17296 | 2433 | |
2434 | /* Set up a suitable value for the DISPLAY variable. */ | |
2435 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2436 | fatal("gethostname: %.100s", strerror(errno)); | |
2437 | /* | |
2438 | * auth_display must be used as the displayname when the | |
2439 | * authorization entry is added with xauth(1). This will be | |
2440 | * different than the DISPLAY string for localhost displays. | |
2441 | */ | |
2442 | if (options.x11_use_localhost) { | |
ff2d7a98 | 2443 | snprintf(display, sizeof display, "localhost:%u.%u", |
e9a17296 | 2444 | s->display_number, s->screen); |
ff2d7a98 | 2445 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
e9a17296 | 2446 | s->display_number, s->screen); |
2447 | s->display = xstrdup(display); | |
2448 | s->auth_display = xstrdup(auth_display); | |
2449 | } else { | |
2450 | #ifdef IPADDR_IN_DISPLAY | |
2451 | struct hostent *he; | |
2452 | struct in_addr my_addr; | |
2453 | ||
2454 | he = gethostbyname(hostname); | |
2455 | if (he == NULL) { | |
2456 | error("Can't get IP address for X11 DISPLAY."); | |
2457 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2458 | return 0; | |
2459 | } | |
2460 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
ff2d7a98 | 2461 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
e9a17296 | 2462 | s->display_number, s->screen); |
2463 | #else | |
ff2d7a98 | 2464 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
e9a17296 | 2465 | s->display_number, s->screen); |
2466 | #endif | |
2467 | s->display = xstrdup(display); | |
2468 | s->auth_display = xstrdup(display); | |
2469 | } | |
2470 | ||
3c0ef626 | 2471 | return 1; |
2472 | } | |
2473 | ||
2474 | static void | |
2475 | do_authenticated2(Authctxt *authctxt) | |
2476 | { | |
2477 | server_loop2(authctxt); | |
416fd2a8 | 2478 | } |
2479 | ||
2480 | void | |
2481 | do_cleanup(Authctxt *authctxt) | |
2482 | { | |
2483 | static int called = 0; | |
2484 | ||
2485 | debug("do_cleanup"); | |
2486 | ||
2487 | /* no cleanup if we're in the child for login shell */ | |
2488 | if (is_child) | |
2489 | return; | |
2490 | ||
2491 | /* avoid double cleanup */ | |
2492 | if (called) | |
2493 | return; | |
2494 | called = 1; | |
2495 | ||
2496 | if (authctxt == NULL) | |
2497 | return; | |
2498 | #ifdef KRB5 | |
2499 | if (options.kerberos_ticket_cleanup && | |
2500 | authctxt->krb5_ctx) | |
2501 | krb5_cleanup_proc(authctxt); | |
2502 | #endif | |
2503 | ||
2504 | #ifdef GSSAPI | |
2505 | if (compat20 && options.gss_cleanup_creds) | |
2506 | ssh_gssapi_cleanup_creds(); | |
b9a54c29 | 2507 | #endif |
416fd2a8 | 2508 | |
2509 | #ifdef USE_PAM | |
2510 | if (options.use_pam) { | |
2511 | sshpam_cleanup(); | |
2512 | sshpam_thread_cleanup(); | |
2513 | } | |
2514 | #endif | |
2515 | ||
2516 | /* remove agent socket */ | |
2517 | auth_sock_cleanup_proc(authctxt->pw); | |
2518 | ||
2519 | /* | |
2520 | * Cleanup ptys/utmp only if privsep is disabled, | |
2521 | * or if running in monitor. | |
2522 | */ | |
2523 | if (!use_privsep || mm_is_monitor()) | |
2524 | session_destroy_all(session_pty_cleanup2); | |
3c0ef626 | 2525 | } |