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ff7ec503 | 1 | /* $OpenBSD: session.c,v 1.220 2006/10/09 23:36:11 djm Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * | |
6 | * As far as I am concerned, the code I have written for this software | |
7 | * can be used freely for any purpose. Any derived versions of this | |
8 | * software must be clearly marked as such, and if the derived work is | |
9 | * incompatible with the protocol description in the RFC file, it must be | |
10 | * called by a name other than "ssh" or "Secure Shell". | |
11 | * | |
12 | * SSH2 support by Markus Friedl. | |
13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. | |
14 | * | |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * 1. Redistributions of source code must retain the above copyright | |
19 | * notice, this list of conditions and the following disclaimer. | |
20 | * 2. Redistributions in binary form must reproduce the above copyright | |
21 | * notice, this list of conditions and the following disclaimer in the | |
22 | * documentation and/or other materials provided with the distribution. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
34 | */ | |
35 | ||
36 | #include "includes.h" | |
3c0ef626 | 37 | |
9108f8d9 | 38 | #include <sys/types.h> |
39 | #include <sys/param.h> | |
40 | #ifdef HAVE_SYS_STAT_H | |
41 | # include <sys/stat.h> | |
42 | #endif | |
43 | #include <sys/socket.h> | |
44 | #include <sys/un.h> | |
45 | #include <sys/wait.h> | |
46 | ||
47 | #include <arpa/inet.h> | |
48 | ||
49 | #include <errno.h> | |
50 | #include <grp.h> | |
51 | #ifdef HAVE_PATHS_H | |
52 | #include <paths.h> | |
53 | #endif | |
54 | #include <pwd.h> | |
55 | #include <signal.h> | |
56 | #include <stdarg.h> | |
57 | #include <stdio.h> | |
58 | #include <stdlib.h> | |
59 | #include <string.h> | |
60 | #include <unistd.h> | |
61 | ||
62 | #include "xmalloc.h" | |
3c0ef626 | 63 | #include "ssh.h" |
64 | #include "ssh1.h" | |
65 | #include "ssh2.h" | |
3c0ef626 | 66 | #include "sshpty.h" |
67 | #include "packet.h" | |
68 | #include "buffer.h" | |
c9f39d2c | 69 | #include "match.h" |
3c0ef626 | 70 | #include "uidswap.h" |
71 | #include "compat.h" | |
72 | #include "channels.h" | |
9108f8d9 | 73 | #include "key.h" |
74 | #include "cipher.h" | |
75 | #ifdef GSSAPI | |
76 | #include "ssh-gss.h" | |
77 | #endif | |
78 | #include "hostfile.h" | |
3c0ef626 | 79 | #include "auth.h" |
80 | #include "auth-options.h" | |
81 | #include "pathnames.h" | |
82 | #include "log.h" | |
83 | #include "servconf.h" | |
84 | #include "sshlogin.h" | |
85 | #include "serverloop.h" | |
86 | #include "canohost.h" | |
87 | #include "session.h" | |
665a873d | 88 | #include "kex.h" |
700318f3 | 89 | #include "monitor_wrap.h" |
3c0ef626 | 90 | |
cdd66111 | 91 | #if defined(KRB5) && defined(USE_AFS) |
92 | #include <kafs.h> | |
93 | #endif | |
94 | ||
3c0ef626 | 95 | /* func */ |
96 | ||
97 | Session *session_new(void); | |
98 | void session_set_fds(Session *, int, int, int); | |
cdd66111 | 99 | void session_pty_cleanup(Session *); |
3c0ef626 | 100 | void session_proctitle(Session *); |
101 | int session_setup_x11fwd(Session *); | |
102 | void do_exec_pty(Session *, const char *); | |
103 | void do_exec_no_pty(Session *, const char *); | |
104 | void do_exec(Session *, const char *); | |
105 | void do_login(Session *, const char *); | |
106 | #ifdef LOGIN_NEEDS_UTMPX | |
107 | static void do_pre_login(Session *s); | |
108 | #endif | |
109 | void do_child(Session *, const char *); | |
110 | void do_motd(void); | |
111 | int check_quietlogin(Session *, const char *); | |
112 | ||
113 | static void do_authenticated1(Authctxt *); | |
114 | static void do_authenticated2(Authctxt *); | |
115 | ||
3c0ef626 | 116 | static int session_pty_req(Session *); |
117 | ||
118 | /* import */ | |
119 | extern ServerOptions options; | |
120 | extern char *__progname; | |
121 | extern int log_stderr; | |
122 | extern int debug_flag; | |
123 | extern u_int utmp_len; | |
124 | extern int startup_pipe; | |
125 | extern void destroy_sensitive_data(void); | |
0fff78ff | 126 | extern Buffer loginmsg; |
3c0ef626 | 127 | |
128 | /* original command from peer. */ | |
129 | const char *original_command = NULL; | |
130 | ||
131 | /* data */ | |
132 | #define MAX_SESSIONS 10 | |
133 | Session sessions[MAX_SESSIONS]; | |
134 | ||
3c0ef626 | 135 | #ifdef HAVE_LOGIN_CAP |
700318f3 | 136 | login_cap_t *lc; |
3c0ef626 | 137 | #endif |
138 | ||
cdd66111 | 139 | static int is_child = 0; |
140 | ||
f5799ae1 | 141 | /* Name and directory of socket for authentication agent forwarding. */ |
142 | static char *auth_sock_name = NULL; | |
143 | static char *auth_sock_dir = NULL; | |
144 | ||
145 | /* removes the agent forwarding socket */ | |
146 | ||
147 | static void | |
cdd66111 | 148 | auth_sock_cleanup_proc(struct passwd *pw) |
f5799ae1 | 149 | { |
f5799ae1 | 150 | if (auth_sock_name != NULL) { |
151 | temporarily_use_uid(pw); | |
152 | unlink(auth_sock_name); | |
153 | rmdir(auth_sock_dir); | |
154 | auth_sock_name = NULL; | |
155 | restore_uid(); | |
156 | } | |
157 | } | |
158 | ||
159 | static int | |
160 | auth_input_request_forwarding(struct passwd * pw) | |
161 | { | |
162 | Channel *nc; | |
163 | int sock; | |
164 | struct sockaddr_un sunaddr; | |
165 | ||
166 | if (auth_sock_name != NULL) { | |
167 | error("authentication forwarding requested twice."); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
172 | temporarily_use_uid(pw); | |
173 | ||
174 | /* Allocate a buffer for the socket name, and format the name. */ | |
175 | auth_sock_name = xmalloc(MAXPATHLEN); | |
176 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
cdd66111 | 177 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
f5799ae1 | 178 | |
179 | /* Create private directory for socket */ | |
180 | if (mkdtemp(auth_sock_dir) == NULL) { | |
181 | packet_send_debug("Agent forwarding disabled: " | |
182 | "mkdtemp() failed: %.100s", strerror(errno)); | |
183 | restore_uid(); | |
184 | xfree(auth_sock_name); | |
185 | xfree(auth_sock_dir); | |
186 | auth_sock_name = NULL; | |
187 | auth_sock_dir = NULL; | |
188 | return 0; | |
189 | } | |
190 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", | |
191 | auth_sock_dir, (long) getpid()); | |
192 | ||
f5799ae1 | 193 | /* Create the socket. */ |
194 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
195 | if (sock < 0) | |
196 | packet_disconnect("socket: %.100s", strerror(errno)); | |
197 | ||
198 | /* Bind it to the name. */ | |
199 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
200 | sunaddr.sun_family = AF_UNIX; | |
201 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
202 | ||
9108f8d9 | 203 | if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) |
f5799ae1 | 204 | packet_disconnect("bind: %.100s", strerror(errno)); |
205 | ||
206 | /* Restore the privileged uid. */ | |
207 | restore_uid(); | |
208 | ||
209 | /* Start listening on the socket. */ | |
cdd66111 | 210 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
f5799ae1 | 211 | packet_disconnect("listen: %.100s", strerror(errno)); |
212 | ||
213 | /* Allocate a channel for the authentication agent socket. */ | |
214 | nc = channel_new("auth socket", | |
215 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
216 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0fff78ff | 217 | 0, "auth socket", 1); |
f5799ae1 | 218 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
219 | return 1; | |
220 | } | |
221 | ||
cdd66111 | 222 | static void |
223 | display_loginmsg(void) | |
224 | { | |
665a873d | 225 | if (buffer_len(&loginmsg) > 0) { |
226 | buffer_append(&loginmsg, "\0", 1); | |
227 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
228 | buffer_clear(&loginmsg); | |
229 | } | |
cdd66111 | 230 | } |
f5799ae1 | 231 | |
3c0ef626 | 232 | void |
233 | do_authenticated(Authctxt *authctxt) | |
234 | { | |
6a9b3198 | 235 | setproctitle("%s", authctxt->pw->pw_name); |
236 | ||
3c0ef626 | 237 | /* setup the channel layer */ |
238 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
239 | channel_permit_all_opens(); | |
240 | ||
241 | if (compat20) | |
242 | do_authenticated2(authctxt); | |
243 | else | |
244 | do_authenticated1(authctxt); | |
245 | ||
cdd66111 | 246 | do_cleanup(authctxt); |
3c0ef626 | 247 | } |
248 | ||
249 | /* | |
250 | * Prepares for an interactive session. This is called after the user has | |
251 | * been successfully authenticated. During this message exchange, pseudo | |
252 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
253 | * are requested, etc. | |
254 | */ | |
255 | static void | |
256 | do_authenticated1(Authctxt *authctxt) | |
257 | { | |
258 | Session *s; | |
259 | char *command; | |
e9a17296 | 260 | int success, type, screen_flag; |
680cee3b | 261 | int enable_compression_after_reply = 0; |
262 | u_int proto_len, data_len, dlen, compression_level = 0; | |
3c0ef626 | 263 | |
264 | s = session_new(); | |
996d5e62 | 265 | if (s == NULL) { |
266 | error("no more sessions"); | |
267 | return; | |
268 | } | |
3c0ef626 | 269 | s->authctxt = authctxt; |
270 | s->pw = authctxt->pw; | |
271 | ||
272 | /* | |
273 | * We stay in this loop until the client requests to execute a shell | |
274 | * or a command. | |
275 | */ | |
276 | for (;;) { | |
277 | success = 0; | |
278 | ||
279 | /* Get a packet from the client. */ | |
e9a17296 | 280 | type = packet_read(); |
3c0ef626 | 281 | |
282 | /* Process the packet. */ | |
283 | switch (type) { | |
284 | case SSH_CMSG_REQUEST_COMPRESSION: | |
3c0ef626 | 285 | compression_level = packet_get_int(); |
e9a17296 | 286 | packet_check_eom(); |
3c0ef626 | 287 | if (compression_level < 1 || compression_level > 9) { |
c9f39d2c | 288 | packet_send_debug("Received invalid compression level %d.", |
e9a17296 | 289 | compression_level); |
3c0ef626 | 290 | break; |
291 | } | |
665a873d | 292 | if (options.compression == COMP_NONE) { |
f5799ae1 | 293 | debug2("compression disabled"); |
294 | break; | |
295 | } | |
3c0ef626 | 296 | /* Enable compression after we have responded with SUCCESS. */ |
297 | enable_compression_after_reply = 1; | |
298 | success = 1; | |
299 | break; | |
300 | ||
301 | case SSH_CMSG_REQUEST_PTY: | |
302 | success = session_pty_req(s); | |
303 | break; | |
304 | ||
305 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
306 | s->auth_proto = packet_get_string(&proto_len); | |
307 | s->auth_data = packet_get_string(&data_len); | |
308 | ||
309 | screen_flag = packet_get_protocol_flags() & | |
310 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
311 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
312 | ||
313 | if (packet_remaining() == 4) { | |
314 | if (!screen_flag) | |
315 | debug2("Buggy client: " | |
316 | "X11 screen flag missing"); | |
317 | s->screen = packet_get_int(); | |
318 | } else { | |
319 | s->screen = 0; | |
320 | } | |
e9a17296 | 321 | packet_check_eom(); |
3c0ef626 | 322 | success = session_setup_x11fwd(s); |
323 | if (!success) { | |
324 | xfree(s->auth_proto); | |
325 | xfree(s->auth_data); | |
326 | s->auth_proto = NULL; | |
327 | s->auth_data = NULL; | |
328 | } | |
329 | break; | |
330 | ||
331 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
332 | if (no_agent_forwarding_flag || compat13) { | |
333 | debug("Authentication agent forwarding not permitted for this authentication."); | |
334 | break; | |
335 | } | |
336 | debug("Received authentication agent forwarding request."); | |
337 | success = auth_input_request_forwarding(s->pw); | |
338 | break; | |
339 | ||
340 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
341 | if (no_port_forwarding_flag) { | |
342 | debug("Port forwarding not permitted for this authentication."); | |
343 | break; | |
344 | } | |
345 | if (!options.allow_tcp_forwarding) { | |
346 | debug("Port forwarding not permitted."); | |
347 | break; | |
348 | } | |
349 | debug("Received TCP/IP port forwarding request."); | |
9108f8d9 | 350 | if (channel_input_port_forward_request(s->pw->pw_uid == 0, |
351 | options.gateway_ports) < 0) { | |
352 | debug("Port forwarding failed."); | |
353 | break; | |
354 | } | |
3c0ef626 | 355 | success = 1; |
356 | break; | |
357 | ||
358 | case SSH_CMSG_MAX_PACKET_SIZE: | |
359 | if (packet_set_maxsize(packet_get_int()) > 0) | |
360 | success = 1; | |
361 | break; | |
e9a17296 | 362 | |
3c0ef626 | 363 | case SSH_CMSG_EXEC_SHELL: |
364 | case SSH_CMSG_EXEC_CMD: | |
365 | if (type == SSH_CMSG_EXEC_CMD) { | |
366 | command = packet_get_string(&dlen); | |
367 | debug("Exec command '%.500s'", command); | |
368 | do_exec(s, command); | |
369 | xfree(command); | |
370 | } else { | |
371 | do_exec(s, NULL); | |
372 | } | |
e9a17296 | 373 | packet_check_eom(); |
3c0ef626 | 374 | session_close(s); |
375 | return; | |
376 | ||
377 | default: | |
378 | /* | |
379 | * Any unknown messages in this phase are ignored, | |
380 | * and a failure message is returned. | |
381 | */ | |
0fff78ff | 382 | logit("Unknown packet type received after authentication: %d", type); |
3c0ef626 | 383 | } |
384 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
385 | packet_send(); | |
386 | packet_write_wait(); | |
387 | ||
388 | /* Enable compression now that we have replied if appropriate. */ | |
389 | if (enable_compression_after_reply) { | |
390 | enable_compression_after_reply = 0; | |
391 | packet_start_compression(compression_level); | |
392 | } | |
393 | } | |
394 | } | |
395 | ||
396 | /* | |
397 | * This is called to fork and execute a command when we have no tty. This | |
398 | * will call do_child from the child, and server_loop from the parent after | |
399 | * setting up file descriptors and such. | |
400 | */ | |
401 | void | |
402 | do_exec_no_pty(Session *s, const char *command) | |
403 | { | |
f5799ae1 | 404 | pid_t pid; |
3c0ef626 | 405 | |
406 | #ifdef USE_PIPES | |
407 | int pin[2], pout[2], perr[2]; | |
408 | /* Allocate pipes for communicating with the program. */ | |
409 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
410 | packet_disconnect("Could not create pipes: %.100s", | |
411 | strerror(errno)); | |
412 | #else /* USE_PIPES */ | |
413 | int inout[2], err[2]; | |
414 | /* Uses socket pairs to communicate with the program. */ | |
415 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
416 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
417 | packet_disconnect("Could not create socket pairs: %.100s", | |
418 | strerror(errno)); | |
419 | #endif /* USE_PIPES */ | |
420 | if (s == NULL) | |
421 | fatal("do_exec_no_pty: no session"); | |
422 | ||
423 | session_proctitle(s); | |
424 | ||
425 | #if defined(USE_PAM) | |
cdd66111 | 426 | if (options.use_pam && !use_privsep) |
0fff78ff | 427 | do_pam_setcred(1); |
3c0ef626 | 428 | #endif /* USE_PAM */ |
429 | ||
430 | /* Fork the child. */ | |
431 | if ((pid = fork()) == 0) { | |
cdd66111 | 432 | is_child = 1; |
41b2f314 | 433 | |
3c0ef626 | 434 | /* Child. Reinitialize the log since the pid has changed. */ |
435 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
436 | ||
437 | /* | |
438 | * Create a new session and process group since the 4.4BSD | |
439 | * setlogin() affects the entire process group. | |
440 | */ | |
441 | if (setsid() < 0) | |
442 | error("setsid failed: %.100s", strerror(errno)); | |
443 | ||
444 | #ifdef USE_PIPES | |
445 | /* | |
446 | * Redirect stdin. We close the parent side of the socket | |
447 | * pair, and make the child side the standard input. | |
448 | */ | |
449 | close(pin[1]); | |
450 | if (dup2(pin[0], 0) < 0) | |
451 | perror("dup2 stdin"); | |
452 | close(pin[0]); | |
453 | ||
454 | /* Redirect stdout. */ | |
455 | close(pout[0]); | |
456 | if (dup2(pout[1], 1) < 0) | |
457 | perror("dup2 stdout"); | |
458 | close(pout[1]); | |
459 | ||
460 | /* Redirect stderr. */ | |
461 | close(perr[0]); | |
462 | if (dup2(perr[1], 2) < 0) | |
463 | perror("dup2 stderr"); | |
464 | close(perr[1]); | |
465 | #else /* USE_PIPES */ | |
466 | /* | |
467 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
468 | * use the same socket, as some programs (particularly rdist) | |
469 | * seem to depend on it. | |
470 | */ | |
471 | close(inout[1]); | |
472 | close(err[1]); | |
473 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
474 | perror("dup2 stdin"); | |
475 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
476 | perror("dup2 stdout"); | |
477 | if (dup2(err[0], 2) < 0) /* stderr */ | |
478 | perror("dup2 stderr"); | |
479 | #endif /* USE_PIPES */ | |
480 | ||
41b2f314 | 481 | #ifdef _UNICOS |
482 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
483 | #endif | |
484 | ||
3c0ef626 | 485 | /* Do processing for the child (exec command etc). */ |
486 | do_child(s, command); | |
487 | /* NOTREACHED */ | |
488 | } | |
41b2f314 | 489 | #ifdef _UNICOS |
490 | signal(WJSIGNAL, cray_job_termination_handler); | |
491 | #endif /* _UNICOS */ | |
3c0ef626 | 492 | #ifdef HAVE_CYGWIN |
493 | if (is_winnt) | |
494 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
495 | #endif | |
496 | if (pid < 0) | |
497 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
498 | s->pid = pid; | |
499 | /* Set interactive/non-interactive mode. */ | |
500 | packet_set_interactive(s->display != NULL); | |
501 | #ifdef USE_PIPES | |
502 | /* We are the parent. Close the child sides of the pipes. */ | |
503 | close(pin[0]); | |
504 | close(pout[1]); | |
505 | close(perr[1]); | |
506 | ||
507 | if (compat20) { | |
c9f39d2c | 508 | if (s->is_subsystem) { |
509 | close(perr[0]); | |
510 | perr[0] = -1; | |
511 | } | |
512 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
3c0ef626 | 513 | } else { |
514 | /* Enter the interactive session. */ | |
515 | server_loop(pid, pin[1], pout[0], perr[0]); | |
516 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ | |
517 | } | |
518 | #else /* USE_PIPES */ | |
519 | /* We are the parent. Close the child sides of the socket pairs. */ | |
520 | close(inout[0]); | |
521 | close(err[0]); | |
522 | ||
99be0775 | 523 | /* |
524 | * Clear loginmsg, since it's the child's responsibility to display | |
525 | * it to the user, otherwise multiple sessions may accumulate | |
526 | * multiple copies of the login messages. | |
527 | */ | |
528 | buffer_clear(&loginmsg); | |
529 | ||
3c0ef626 | 530 | /* |
531 | * Enter the interactive session. Note: server_loop must be able to | |
532 | * handle the case that fdin and fdout are the same. | |
533 | */ | |
534 | if (compat20) { | |
535 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); | |
536 | } else { | |
537 | server_loop(pid, inout[1], inout[1], err[1]); | |
538 | /* server_loop has closed inout[1] and err[1]. */ | |
539 | } | |
540 | #endif /* USE_PIPES */ | |
541 | } | |
542 | ||
543 | /* | |
544 | * This is called to fork and execute a command when we have a tty. This | |
545 | * will call do_child from the child, and server_loop from the parent after | |
546 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
547 | * lastlog, and other such operations. | |
548 | */ | |
549 | void | |
550 | do_exec_pty(Session *s, const char *command) | |
551 | { | |
552 | int fdout, ptyfd, ttyfd, ptymaster; | |
553 | pid_t pid; | |
554 | ||
555 | if (s == NULL) | |
556 | fatal("do_exec_pty: no session"); | |
557 | ptyfd = s->ptyfd; | |
558 | ttyfd = s->ttyfd; | |
559 | ||
560 | #if defined(USE_PAM) | |
0fff78ff | 561 | if (options.use_pam) { |
562 | do_pam_set_tty(s->tty); | |
cdd66111 | 563 | if (!use_privsep) |
564 | do_pam_setcred(1); | |
0fff78ff | 565 | } |
3c0ef626 | 566 | #endif |
567 | ||
568 | /* Fork the child. */ | |
569 | if ((pid = fork()) == 0) { | |
cdd66111 | 570 | is_child = 1; |
3c0ef626 | 571 | |
572 | /* Child. Reinitialize the log because the pid has changed. */ | |
573 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
574 | /* Close the master side of the pseudo tty. */ | |
575 | close(ptyfd); | |
576 | ||
577 | /* Make the pseudo tty our controlling tty. */ | |
578 | pty_make_controlling_tty(&ttyfd, s->tty); | |
579 | ||
580 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ | |
581 | if (dup2(ttyfd, 0) < 0) | |
582 | error("dup2 stdin: %s", strerror(errno)); | |
583 | if (dup2(ttyfd, 1) < 0) | |
584 | error("dup2 stdout: %s", strerror(errno)); | |
585 | if (dup2(ttyfd, 2) < 0) | |
586 | error("dup2 stderr: %s", strerror(errno)); | |
587 | ||
588 | /* Close the extra descriptor for the pseudo tty. */ | |
589 | close(ttyfd); | |
590 | ||
591 | /* record login, etc. similar to login(1) */ | |
592 | #ifndef HAVE_OSF_SIA | |
41b2f314 | 593 | if (!(options.use_login && command == NULL)) { |
594 | #ifdef _UNICOS | |
595 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
596 | #endif /* _UNICOS */ | |
3c0ef626 | 597 | do_login(s, command); |
41b2f314 | 598 | } |
3c0ef626 | 599 | # ifdef LOGIN_NEEDS_UTMPX |
600 | else | |
601 | do_pre_login(s); | |
602 | # endif | |
603 | #endif | |
604 | ||
605 | /* Do common processing for the child, such as execing the command. */ | |
606 | do_child(s, command); | |
607 | /* NOTREACHED */ | |
608 | } | |
41b2f314 | 609 | #ifdef _UNICOS |
610 | signal(WJSIGNAL, cray_job_termination_handler); | |
611 | #endif /* _UNICOS */ | |
3c0ef626 | 612 | #ifdef HAVE_CYGWIN |
613 | if (is_winnt) | |
614 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
615 | #endif | |
616 | if (pid < 0) | |
617 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
618 | s->pid = pid; | |
619 | ||
620 | /* Parent. Close the slave side of the pseudo tty. */ | |
621 | close(ttyfd); | |
622 | ||
623 | /* | |
624 | * Create another descriptor of the pty master side for use as the | |
625 | * standard input. We could use the original descriptor, but this | |
626 | * simplifies code in server_loop. The descriptor is bidirectional. | |
627 | */ | |
628 | fdout = dup(ptyfd); | |
629 | if (fdout < 0) | |
630 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
631 | ||
632 | /* we keep a reference to the pty master */ | |
633 | ptymaster = dup(ptyfd); | |
634 | if (ptymaster < 0) | |
635 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
636 | s->ptymaster = ptymaster; | |
637 | ||
638 | /* Enter interactive session. */ | |
639 | packet_set_interactive(1); | |
640 | if (compat20) { | |
641 | session_set_fds(s, ptyfd, fdout, -1); | |
642 | } else { | |
643 | server_loop(pid, ptyfd, fdout, -1); | |
644 | /* server_loop _has_ closed ptyfd and fdout. */ | |
645 | } | |
646 | } | |
647 | ||
648 | #ifdef LOGIN_NEEDS_UTMPX | |
649 | static void | |
650 | do_pre_login(Session *s) | |
651 | { | |
652 | socklen_t fromlen; | |
653 | struct sockaddr_storage from; | |
654 | pid_t pid = getpid(); | |
655 | ||
656 | /* | |
657 | * Get IP address of client. If the connection is not a socket, let | |
658 | * the address be 0.0.0.0. | |
659 | */ | |
660 | memset(&from, 0, sizeof(from)); | |
41b2f314 | 661 | fromlen = sizeof(from); |
3c0ef626 | 662 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 663 | if (getpeername(packet_get_connection_in(), |
9108f8d9 | 664 | (struct sockaddr *)&from, &fromlen) < 0) { |
3c0ef626 | 665 | debug("getpeername: %.100s", strerror(errno)); |
cdd66111 | 666 | cleanup_exit(255); |
3c0ef626 | 667 | } |
668 | } | |
669 | ||
670 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
0fff78ff | 671 | get_remote_name_or_ip(utmp_len, options.use_dns), |
6a9b3198 | 672 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 673 | } |
674 | #endif | |
675 | ||
676 | /* | |
677 | * This is called to fork and execute a command. If another command is | |
678 | * to be forced, execute that instead. | |
679 | */ | |
680 | void | |
681 | do_exec(Session *s, const char *command) | |
682 | { | |
9108f8d9 | 683 | if (options.adm_forced_command) { |
684 | original_command = command; | |
685 | command = options.adm_forced_command; | |
686 | debug("Forced command (config) '%.900s'", command); | |
687 | } else if (forced_command) { | |
3c0ef626 | 688 | original_command = command; |
689 | command = forced_command; | |
9108f8d9 | 690 | debug("Forced command (key option) '%.900s'", command); |
3c0ef626 | 691 | } |
692 | ||
996d5e62 | 693 | #ifdef SSH_AUDIT_EVENTS |
694 | if (command != NULL) | |
695 | PRIVSEP(audit_run_command(command)); | |
696 | else if (s->ttyfd == -1) { | |
697 | char *shell = s->pw->pw_shell; | |
698 | ||
699 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
700 | shell =_PATH_BSHELL; | |
701 | PRIVSEP(audit_run_command(shell)); | |
0fff78ff | 702 | } |
703 | #endif | |
704 | ||
3c0ef626 | 705 | if (s->ttyfd != -1) |
706 | do_exec_pty(s, command); | |
707 | else | |
708 | do_exec_no_pty(s, command); | |
709 | ||
710 | original_command = NULL; | |
3c0ef626 | 711 | |
c9f39d2c | 712 | /* |
713 | * Clear loginmsg: it's the child's responsibility to display | |
714 | * it to the user, otherwise multiple sessions may accumulate | |
715 | * multiple copies of the login messages. | |
716 | */ | |
717 | buffer_clear(&loginmsg); | |
718 | } | |
e9a17296 | 719 | |
3c0ef626 | 720 | /* administrative, login(1)-like work */ |
721 | void | |
722 | do_login(Session *s, const char *command) | |
723 | { | |
3c0ef626 | 724 | socklen_t fromlen; |
725 | struct sockaddr_storage from; | |
3c0ef626 | 726 | struct passwd * pw = s->pw; |
727 | pid_t pid = getpid(); | |
728 | ||
729 | /* | |
730 | * Get IP address of client. If the connection is not a socket, let | |
731 | * the address be 0.0.0.0. | |
732 | */ | |
733 | memset(&from, 0, sizeof(from)); | |
6a9b3198 | 734 | fromlen = sizeof(from); |
3c0ef626 | 735 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 736 | if (getpeername(packet_get_connection_in(), |
e9a17296 | 737 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 738 | debug("getpeername: %.100s", strerror(errno)); |
cdd66111 | 739 | cleanup_exit(255); |
3c0ef626 | 740 | } |
741 | } | |
742 | ||
3c0ef626 | 743 | /* Record that there was a login on that tty from the remote host. */ |
700318f3 | 744 | if (!use_privsep) |
745 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
746 | get_remote_name_or_ip(utmp_len, | |
0fff78ff | 747 | options.use_dns), |
41b2f314 | 748 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 749 | |
750 | #ifdef USE_PAM | |
751 | /* | |
752 | * If password change is needed, do it now. | |
753 | * This needs to occur before the ~/.hushlogin check. | |
754 | */ | |
cdd66111 | 755 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
756 | display_loginmsg(); | |
3c0ef626 | 757 | do_pam_chauthtok(); |
cdd66111 | 758 | s->authctxt->force_pwchange = 0; |
0fff78ff | 759 | /* XXX - signal [net] parent to enable forwardings */ |
3c0ef626 | 760 | } |
761 | #endif | |
762 | ||
763 | if (check_quietlogin(s, command)) | |
764 | return; | |
765 | ||
cdd66111 | 766 | display_loginmsg(); |
3c0ef626 | 767 | |
3c0ef626 | 768 | do_motd(); |
769 | } | |
770 | ||
771 | /* | |
772 | * Display the message of the day. | |
773 | */ | |
774 | void | |
775 | do_motd(void) | |
776 | { | |
777 | FILE *f; | |
778 | char buf[256]; | |
779 | ||
780 | if (options.print_motd) { | |
781 | #ifdef HAVE_LOGIN_CAP | |
782 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
783 | "/etc/motd"), "r"); | |
784 | #else | |
785 | f = fopen("/etc/motd", "r"); | |
786 | #endif | |
787 | if (f) { | |
788 | while (fgets(buf, sizeof(buf), f)) | |
789 | fputs(buf, stdout); | |
790 | fclose(f); | |
791 | } | |
792 | } | |
793 | } | |
794 | ||
795 | ||
796 | /* | |
797 | * Check for quiet login, either .hushlogin or command given. | |
798 | */ | |
799 | int | |
800 | check_quietlogin(Session *s, const char *command) | |
801 | { | |
802 | char buf[256]; | |
803 | struct passwd *pw = s->pw; | |
804 | struct stat st; | |
805 | ||
806 | /* Return 1 if .hushlogin exists or a command given. */ | |
807 | if (command != NULL) | |
808 | return 1; | |
809 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
810 | #ifdef HAVE_LOGIN_CAP | |
811 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
812 | return 1; | |
813 | #else | |
814 | if (stat(buf, &st) >= 0) | |
815 | return 1; | |
816 | #endif | |
817 | return 0; | |
818 | } | |
819 | ||
820 | /* | |
821 | * Sets the value of the given variable in the environment. If the variable | |
822 | * already exists, its value is overriden. | |
823 | */ | |
0fff78ff | 824 | void |
3c0ef626 | 825 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
e9a17296 | 826 | const char *value) |
3c0ef626 | 827 | { |
3c0ef626 | 828 | char **env; |
acc3d05e | 829 | u_int envsize; |
830 | u_int i, namelen; | |
3c0ef626 | 831 | |
0fff78ff | 832 | /* |
833 | * If we're passed an uninitialized list, allocate a single null | |
834 | * entry before continuing. | |
835 | */ | |
836 | if (*envp == NULL && *envsizep == 0) { | |
837 | *envp = xmalloc(sizeof(char *)); | |
838 | *envp[0] = NULL; | |
839 | *envsizep = 1; | |
840 | } | |
841 | ||
3c0ef626 | 842 | /* |
843 | * Find the slot where the value should be stored. If the variable | |
844 | * already exists, we reuse the slot; otherwise we append a new slot | |
845 | * at the end of the array, expanding if necessary. | |
846 | */ | |
847 | env = *envp; | |
848 | namelen = strlen(name); | |
849 | for (i = 0; env[i]; i++) | |
850 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
851 | break; | |
852 | if (env[i]) { | |
853 | /* Reuse the slot. */ | |
854 | xfree(env[i]); | |
855 | } else { | |
856 | /* New variable. Expand if necessary. */ | |
acc3d05e | 857 | envsize = *envsizep; |
858 | if (i >= envsize - 1) { | |
859 | if (envsize >= 1000) | |
860 | fatal("child_set_env: too many env vars"); | |
861 | envsize += 50; | |
9108f8d9 | 862 | env = (*envp) = xrealloc(env, envsize, sizeof(char *)); |
acc3d05e | 863 | *envsizep = envsize; |
3c0ef626 | 864 | } |
865 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
866 | env[i + 1] = NULL; | |
867 | } | |
868 | ||
869 | /* Allocate space and format the variable in the appropriate slot. */ | |
870 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
871 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
872 | } | |
873 | ||
874 | /* | |
875 | * Reads environment variables from the given file and adds/overrides them | |
876 | * into the environment. If the file does not exist, this does nothing. | |
877 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
878 | * and assignments of the form name=value. No other forms are allowed. | |
879 | */ | |
880 | static void | |
881 | read_environment_file(char ***env, u_int *envsize, | |
e9a17296 | 882 | const char *filename) |
3c0ef626 | 883 | { |
884 | FILE *f; | |
885 | char buf[4096]; | |
886 | char *cp, *value; | |
680cee3b | 887 | u_int lineno = 0; |
3c0ef626 | 888 | |
889 | f = fopen(filename, "r"); | |
890 | if (!f) | |
891 | return; | |
892 | ||
893 | while (fgets(buf, sizeof(buf), f)) { | |
680cee3b | 894 | if (++lineno > 1000) |
895 | fatal("Too many lines in environment file %s", filename); | |
3c0ef626 | 896 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
897 | ; | |
898 | if (!*cp || *cp == '#' || *cp == '\n') | |
899 | continue; | |
900 | if (strchr(cp, '\n')) | |
901 | *strchr(cp, '\n') = '\0'; | |
902 | value = strchr(cp, '='); | |
903 | if (value == NULL) { | |
680cee3b | 904 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
905 | filename); | |
3c0ef626 | 906 | continue; |
907 | } | |
908 | /* | |
909 | * Replace the equals sign by nul, and advance value to | |
910 | * the value string. | |
911 | */ | |
912 | *value = '\0'; | |
913 | value++; | |
914 | child_set_env(env, envsize, cp, value); | |
915 | } | |
916 | fclose(f); | |
917 | } | |
918 | ||
0fff78ff | 919 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
920 | /* | |
921 | * Return named variable from specified environment, or NULL if not present. | |
922 | */ | |
923 | static char * | |
924 | child_get_env(char **env, const char *name) | |
925 | { | |
926 | int i; | |
927 | size_t len; | |
928 | ||
929 | len = strlen(name); | |
930 | for (i=0; env[i] != NULL; i++) | |
931 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
932 | return(env[i] + len + 1); | |
933 | return NULL; | |
934 | } | |
935 | ||
936 | /* | |
937 | * Read /etc/default/login. | |
938 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
939 | */ | |
940 | static void | |
941 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
942 | { | |
943 | char **tmpenv = NULL, *var; | |
acc3d05e | 944 | u_int i, tmpenvsize = 0; |
cdd66111 | 945 | u_long mask; |
0fff78ff | 946 | |
947 | /* | |
948 | * We don't want to copy the whole file to the child's environment, | |
949 | * so we use a temporary environment and copy the variables we're | |
950 | * interested in. | |
951 | */ | |
952 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
953 | ||
acc3d05e | 954 | if (tmpenv == NULL) |
955 | return; | |
956 | ||
0fff78ff | 957 | if (uid == 0) |
958 | var = child_get_env(tmpenv, "SUPATH"); | |
959 | else | |
960 | var = child_get_env(tmpenv, "PATH"); | |
961 | if (var != NULL) | |
962 | child_set_env(env, envsize, "PATH", var); | |
cdd66111 | 963 | |
0fff78ff | 964 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
965 | if (sscanf(var, "%5lo", &mask) == 1) | |
cdd66111 | 966 | umask((mode_t)mask); |
967 | ||
0fff78ff | 968 | for (i = 0; tmpenv[i] != NULL; i++) |
969 | xfree(tmpenv[i]); | |
970 | xfree(tmpenv); | |
971 | } | |
972 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
973 | ||
665a873d | 974 | void |
975 | copy_environment(char **source, char ***env, u_int *envsize) | |
3c0ef626 | 976 | { |
e9a17296 | 977 | char *var_name, *var_val; |
3c0ef626 | 978 | int i; |
979 | ||
e9a17296 | 980 | if (source == NULL) |
3c0ef626 | 981 | return; |
982 | ||
e9a17296 | 983 | for(i = 0; source[i] != NULL; i++) { |
984 | var_name = xstrdup(source[i]); | |
985 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
986 | xfree(var_name); | |
3c0ef626 | 987 | continue; |
3c0ef626 | 988 | } |
e9a17296 | 989 | *var_val++ = '\0'; |
3c0ef626 | 990 | |
e9a17296 | 991 | debug3("Copy environment: %s=%s", var_name, var_val); |
992 | child_set_env(env, envsize, var_name, var_val); | |
cdd66111 | 993 | |
e9a17296 | 994 | xfree(var_name); |
3c0ef626 | 995 | } |
996 | } | |
3c0ef626 | 997 | |
e9a17296 | 998 | static char ** |
999 | do_setup_env(Session *s, const char *shell) | |
3c0ef626 | 1000 | { |
3c0ef626 | 1001 | char buf[256]; |
e9a17296 | 1002 | u_int i, envsize; |
9108f8d9 | 1003 | char **env, *laddr; |
e9a17296 | 1004 | struct passwd *pw = s->pw; |
9108f8d9 | 1005 | #ifndef HAVE_LOGIN_CAP |
1006 | char *path = NULL; | |
1007 | #endif | |
3c0ef626 | 1008 | |
1009 | /* Initialize the environment. */ | |
1010 | envsize = 100; | |
9108f8d9 | 1011 | env = xcalloc(envsize, sizeof(char *)); |
3c0ef626 | 1012 | env[0] = NULL; |
1013 | ||
1014 | #ifdef HAVE_CYGWIN | |
1015 | /* | |
1016 | * The Windows environment contains some setting which are | |
1017 | * important for a running system. They must not be dropped. | |
1018 | */ | |
996d5e62 | 1019 | { |
1020 | char **p; | |
1021 | ||
1022 | p = fetch_windows_environment(); | |
1023 | copy_environment(p, &env, &envsize); | |
1024 | free_windows_environment(p); | |
1025 | } | |
3c0ef626 | 1026 | #endif |
1027 | ||
0fff78ff | 1028 | #ifdef GSSAPI |
cdd66111 | 1029 | /* Allow any GSSAPI methods that we've used to alter |
0fff78ff | 1030 | * the childs environment as they see fit |
1031 | */ | |
1032 | ssh_gssapi_do_child(&env, &envsize); | |
1033 | #endif | |
1034 | ||
3c0ef626 | 1035 | if (!options.use_login) { |
1036 | /* Set basic environment. */ | |
c9f39d2c | 1037 | for (i = 0; i < s->num_env; i++) |
1038 | child_set_env(&env, &envsize, s->env[i].name, | |
1039 | s->env[i].val); | |
1040 | ||
3c0ef626 | 1041 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1042 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
6a9b3198 | 1043 | #ifdef _AIX |
1044 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1045 | #endif | |
3c0ef626 | 1046 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
1047 | #ifdef HAVE_LOGIN_CAP | |
41b2f314 | 1048 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1049 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1050 | else | |
1051 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
3c0ef626 | 1052 | #else /* HAVE_LOGIN_CAP */ |
1053 | # ifndef HAVE_CYGWIN | |
1054 | /* | |
1055 | * There's no standard path on Windows. The path contains | |
1056 | * important components pointing to the system directories, | |
1057 | * needed for loading shared libraries. So the path better | |
1058 | * remains intact here. | |
1059 | */ | |
0fff78ff | 1060 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1061 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1062 | path = child_get_env(env, "PATH"); | |
1063 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1064 | if (path == NULL || *path == '\0') { | |
cdd66111 | 1065 | child_set_env(&env, &envsize, "PATH", |
0fff78ff | 1066 | s->pw->pw_uid == 0 ? |
1067 | SUPERUSER_PATH : _PATH_STDPATH); | |
1068 | } | |
3c0ef626 | 1069 | # endif /* HAVE_CYGWIN */ |
1070 | #endif /* HAVE_LOGIN_CAP */ | |
1071 | ||
1072 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1073 | _PATH_MAILDIR, pw->pw_name); | |
1074 | child_set_env(&env, &envsize, "MAIL", buf); | |
1075 | ||
1076 | /* Normal systems set SHELL by default. */ | |
1077 | child_set_env(&env, &envsize, "SHELL", shell); | |
1078 | } | |
1079 | if (getenv("TZ")) | |
1080 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1081 | ||
1082 | /* Set custom environment options from RSA authentication. */ | |
1083 | if (!options.use_login) { | |
1084 | while (custom_environment) { | |
1085 | struct envstring *ce = custom_environment; | |
41b2f314 | 1086 | char *str = ce->s; |
e9a17296 | 1087 | |
41b2f314 | 1088 | for (i = 0; str[i] != '=' && str[i]; i++) |
3c0ef626 | 1089 | ; |
41b2f314 | 1090 | if (str[i] == '=') { |
1091 | str[i] = 0; | |
1092 | child_set_env(&env, &envsize, str, str + i + 1); | |
3c0ef626 | 1093 | } |
1094 | custom_environment = ce->next; | |
1095 | xfree(ce->s); | |
1096 | xfree(ce); | |
1097 | } | |
1098 | } | |
1099 | ||
41b2f314 | 1100 | /* SSH_CLIENT deprecated */ |
3c0ef626 | 1101 | snprintf(buf, sizeof buf, "%.50s %d %d", |
e9a17296 | 1102 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
3c0ef626 | 1103 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1104 | ||
6a9b3198 | 1105 | laddr = get_local_ipaddr(packet_get_connection_in()); |
41b2f314 | 1106 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
6a9b3198 | 1107 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1108 | xfree(laddr); | |
41b2f314 | 1109 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1110 | ||
3c0ef626 | 1111 | if (s->ttyfd != -1) |
1112 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1113 | if (s->term) | |
1114 | child_set_env(&env, &envsize, "TERM", s->term); | |
1115 | if (s->display) | |
1116 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
1117 | if (original_command) | |
1118 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1119 | original_command); | |
1120 | ||
41b2f314 | 1121 | #ifdef _UNICOS |
1122 | if (cray_tmpdir[0] != '\0') | |
1123 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1124 | #endif /* _UNICOS */ | |
1125 | ||
996d5e62 | 1126 | /* |
1127 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1128 | * must have been set by a native authentication method (eg AIX or | |
1129 | * SIA), so copy it to the child. | |
1130 | */ | |
1131 | { | |
1132 | char *cp; | |
1133 | ||
1134 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1135 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1136 | } | |
1137 | ||
3c0ef626 | 1138 | #ifdef _AIX |
e9a17296 | 1139 | { |
1140 | char *cp; | |
1141 | ||
1142 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1143 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
e9a17296 | 1144 | read_environment_file(&env, &envsize, "/etc/environment"); |
1145 | } | |
3c0ef626 | 1146 | #endif |
3c0ef626 | 1147 | #ifdef KRB5 |
99be0775 | 1148 | if (s->authctxt->krb5_ccname) |
3c0ef626 | 1149 | child_set_env(&env, &envsize, "KRB5CCNAME", |
99be0775 | 1150 | s->authctxt->krb5_ccname); |
3c0ef626 | 1151 | #endif |
1152 | #ifdef USE_PAM | |
41b2f314 | 1153 | /* |
1154 | * Pull in any environment variables that may have | |
1155 | * been set by PAM. | |
1156 | */ | |
0fff78ff | 1157 | if (options.use_pam) { |
cdd66111 | 1158 | char **p; |
41b2f314 | 1159 | |
cdd66111 | 1160 | p = fetch_pam_child_environment(); |
1161 | copy_environment(p, &env, &envsize); | |
1162 | free_pam_environment(p); | |
1163 | ||
1164 | p = fetch_pam_environment(); | |
41b2f314 | 1165 | copy_environment(p, &env, &envsize); |
1166 | free_pam_environment(p); | |
1167 | } | |
3c0ef626 | 1168 | #endif /* USE_PAM */ |
1169 | ||
f5799ae1 | 1170 | if (auth_sock_name != NULL) |
3c0ef626 | 1171 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
f5799ae1 | 1172 | auth_sock_name); |
3c0ef626 | 1173 | |
1174 | /* read $HOME/.ssh/environment. */ | |
41b2f314 | 1175 | if (options.permit_user_env && !options.use_login) { |
3c0ef626 | 1176 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
41b2f314 | 1177 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
3c0ef626 | 1178 | read_environment_file(&env, &envsize, buf); |
1179 | } | |
1180 | if (debug_flag) { | |
1181 | /* dump the environment */ | |
1182 | fprintf(stderr, "Environment:\n"); | |
1183 | for (i = 0; env[i]; i++) | |
1184 | fprintf(stderr, " %.200s\n", env[i]); | |
1185 | } | |
e9a17296 | 1186 | return env; |
1187 | } | |
1188 | ||
1189 | /* | |
1190 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1191 | * first in this order). | |
1192 | */ | |
1193 | static void | |
1194 | do_rc_files(Session *s, const char *shell) | |
1195 | { | |
1196 | FILE *f = NULL; | |
1197 | char cmd[1024]; | |
1198 | int do_xauth; | |
1199 | struct stat st; | |
1200 | ||
1201 | do_xauth = | |
1202 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1203 | ||
1204 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1205 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1206 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1207 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1208 | if (debug_flag) | |
1209 | fprintf(stderr, "Running %s\n", cmd); | |
1210 | f = popen(cmd, "w"); | |
1211 | if (f) { | |
1212 | if (do_xauth) | |
1213 | fprintf(f, "%s %s\n", s->auth_proto, | |
1214 | s->auth_data); | |
1215 | pclose(f); | |
1216 | } else | |
1217 | fprintf(stderr, "Could not run %s\n", | |
1218 | _PATH_SSH_USER_RC); | |
1219 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1220 | if (debug_flag) | |
1221 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1222 | _PATH_SSH_SYSTEM_RC); | |
1223 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1224 | if (f) { | |
1225 | if (do_xauth) | |
1226 | fprintf(f, "%s %s\n", s->auth_proto, | |
1227 | s->auth_data); | |
1228 | pclose(f); | |
1229 | } else | |
1230 | fprintf(stderr, "Could not run %s\n", | |
1231 | _PATH_SSH_SYSTEM_RC); | |
1232 | } else if (do_xauth && options.xauth_location != NULL) { | |
1233 | /* Add authority data to .Xauthority if appropriate. */ | |
1234 | if (debug_flag) { | |
1235 | fprintf(stderr, | |
6a9b3198 | 1236 | "Running %.500s remove %.100s\n", |
cdd66111 | 1237 | options.xauth_location, s->auth_display); |
6a9b3198 | 1238 | fprintf(stderr, |
1239 | "%.500s add %.100s %.100s %.100s\n", | |
e9a17296 | 1240 | options.xauth_location, s->auth_display, |
1241 | s->auth_proto, s->auth_data); | |
1242 | } | |
1243 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1244 | options.xauth_location); | |
1245 | f = popen(cmd, "w"); | |
1246 | if (f) { | |
6a9b3198 | 1247 | fprintf(f, "remove %s\n", |
1248 | s->auth_display); | |
e9a17296 | 1249 | fprintf(f, "add %s %s %s\n", |
1250 | s->auth_display, s->auth_proto, | |
1251 | s->auth_data); | |
1252 | pclose(f); | |
1253 | } else { | |
1254 | fprintf(stderr, "Could not run %s\n", | |
1255 | cmd); | |
1256 | } | |
1257 | } | |
1258 | } | |
1259 | ||
1260 | static void | |
1261 | do_nologin(struct passwd *pw) | |
1262 | { | |
1263 | FILE *f = NULL; | |
1264 | char buf[1024]; | |
1265 | ||
1266 | #ifdef HAVE_LOGIN_CAP | |
1267 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1268 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1269 | _PATH_NOLOGIN), "r"); | |
1270 | #else | |
1271 | if (pw->pw_uid) | |
1272 | f = fopen(_PATH_NOLOGIN, "r"); | |
1273 | #endif | |
1274 | if (f) { | |
1275 | /* /etc/nologin exists. Print its contents and exit. */ | |
0fff78ff | 1276 | logit("User %.100s not allowed because %s exists", |
41b2f314 | 1277 | pw->pw_name, _PATH_NOLOGIN); |
e9a17296 | 1278 | while (fgets(buf, sizeof(buf), f)) |
1279 | fputs(buf, stderr); | |
1280 | fclose(f); | |
6a9b3198 | 1281 | fflush(NULL); |
e9a17296 | 1282 | exit(254); |
1283 | } | |
1284 | } | |
1285 | ||
1286 | /* Set login name, uid, gid, and groups. */ | |
700318f3 | 1287 | void |
e9a17296 | 1288 | do_setusercontext(struct passwd *pw) |
1289 | { | |
6a9b3198 | 1290 | #ifndef HAVE_CYGWIN |
1291 | if (getuid() == 0 || geteuid() == 0) | |
e9a17296 | 1292 | #endif /* HAVE_CYGWIN */ |
6a9b3198 | 1293 | { |
1294 | ||
f5799ae1 | 1295 | #ifdef HAVE_SETPCRED |
0fff78ff | 1296 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1297 | fatal("Failed to set process credentials"); | |
f5799ae1 | 1298 | #endif /* HAVE_SETPCRED */ |
e9a17296 | 1299 | #ifdef HAVE_LOGIN_CAP |
41b2f314 | 1300 | # ifdef __bsdi__ |
680cee3b | 1301 | setpgid(0, 0); |
41b2f314 | 1302 | # endif |
996d5e62 | 1303 | #ifdef GSSAPI |
1304 | if (options.gss_authentication) { | |
1305 | temporarily_use_uid(pw); | |
1306 | ssh_gssapi_storecreds(); | |
1307 | restore_uid(); | |
1308 | } | |
1309 | #endif | |
cdd66111 | 1310 | # ifdef USE_PAM |
1311 | if (options.use_pam) { | |
1312 | do_pam_session(); | |
1313 | do_pam_setcred(0); | |
1314 | } | |
1315 | # endif /* USE_PAM */ | |
e9a17296 | 1316 | if (setusercontext(lc, pw, pw->pw_uid, |
1317 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1318 | perror("unable to set user context"); | |
1319 | exit(1); | |
1320 | } | |
1321 | #else | |
1322 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1323 | /* Sets login uid for accounting */ | |
1324 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1325 | error("setluid: %s", strerror(errno)); | |
1326 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1327 | ||
1328 | if (setlogin(pw->pw_name) < 0) | |
1329 | error("setlogin failed: %s", strerror(errno)); | |
1330 | if (setgid(pw->pw_gid) < 0) { | |
1331 | perror("setgid"); | |
1332 | exit(1); | |
1333 | } | |
1334 | /* Initialize the group list. */ | |
1335 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1336 | perror("initgroups"); | |
1337 | exit(1); | |
1338 | } | |
1339 | endgrent(); | |
996d5e62 | 1340 | #ifdef GSSAPI |
1341 | if (options.gss_authentication) { | |
1342 | temporarily_use_uid(pw); | |
1343 | ssh_gssapi_storecreds(); | |
1344 | restore_uid(); | |
1345 | } | |
1346 | #endif | |
e9a17296 | 1347 | # ifdef USE_PAM |
1348 | /* | |
cdd66111 | 1349 | * PAM credentials may take the form of supplementary groups. |
e9a17296 | 1350 | * These will have been wiped by the above initgroups() call. |
1351 | * Reestablish them here. | |
1352 | */ | |
0fff78ff | 1353 | if (options.use_pam) { |
1354 | do_pam_session(); | |
1355 | do_pam_setcred(0); | |
1356 | } | |
e9a17296 | 1357 | # endif /* USE_PAM */ |
1358 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1359 | irix_setusercontext(pw); | |
1360 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
680cee3b | 1361 | # ifdef _AIX |
41b2f314 | 1362 | aix_usrinfo(pw); |
680cee3b | 1363 | # endif /* _AIX */ |
665a873d | 1364 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
1365 | if (set_id(pw->pw_name) != 0) { | |
1366 | exit(1); | |
1367 | } | |
1368 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ | |
e9a17296 | 1369 | /* Permanently switch to the desired uid. */ |
1370 | permanently_set_uid(pw); | |
1371 | #endif | |
1372 | } | |
6a9b3198 | 1373 | |
1374 | #ifdef HAVE_CYGWIN | |
1375 | if (is_winnt) | |
1376 | #endif | |
e9a17296 | 1377 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1378 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
9108f8d9 | 1379 | |
1380 | #ifdef WITH_SELINUX | |
1381 | ssh_selinux_setup_exec_context(pw->pw_name); | |
1382 | #endif | |
e9a17296 | 1383 | } |
1384 | ||
cdd66111 | 1385 | static void |
1386 | do_pwchange(Session *s) | |
1387 | { | |
c9f39d2c | 1388 | fflush(NULL); |
cdd66111 | 1389 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1390 | if (s->ttyfd != -1) { | |
c9f39d2c | 1391 | fprintf(stderr, |
cdd66111 | 1392 | "You must change your password now and login again!\n"); |
996d5e62 | 1393 | #ifdef PASSWD_NEEDS_USERNAME |
1394 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1395 | (char *)NULL); | |
1396 | #else | |
cdd66111 | 1397 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
996d5e62 | 1398 | #endif |
cdd66111 | 1399 | perror("passwd"); |
1400 | } else { | |
1401 | fprintf(stderr, | |
1402 | "Password change required but no TTY available.\n"); | |
1403 | } | |
1404 | exit(1); | |
1405 | } | |
1406 | ||
700318f3 | 1407 | static void |
1408 | launch_login(struct passwd *pw, const char *hostname) | |
1409 | { | |
1410 | /* Launch login(1). */ | |
1411 | ||
f5799ae1 | 1412 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
700318f3 | 1413 | #ifdef xxxLOGIN_NEEDS_TERM |
f5799ae1 | 1414 | (s->term ? s->term : "unknown"), |
700318f3 | 1415 | #endif /* LOGIN_NEEDS_TERM */ |
1416 | #ifdef LOGIN_NO_ENDOPT | |
1417 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1418 | #else | |
1419 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1420 | #endif | |
1421 | ||
1422 | /* Login couldn't be executed, die. */ | |
1423 | ||
1424 | perror("login"); | |
1425 | exit(1); | |
1426 | } | |
1427 | ||
cdd66111 | 1428 | static void |
1429 | child_close_fds(void) | |
1430 | { | |
1431 | int i; | |
1432 | ||
1433 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1434 | close(packet_get_connection_in()); | |
1435 | else { | |
1436 | close(packet_get_connection_in()); | |
1437 | close(packet_get_connection_out()); | |
1438 | } | |
1439 | /* | |
1440 | * Close all descriptors related to channels. They will still remain | |
1441 | * open in the parent. | |
1442 | */ | |
1443 | /* XXX better use close-on-exec? -markus */ | |
1444 | channel_close_all(); | |
1445 | ||
1446 | /* | |
1447 | * Close any extra file descriptors. Note that there may still be | |
1448 | * descriptors left by system functions. They will be closed later. | |
1449 | */ | |
1450 | endpwent(); | |
1451 | ||
1452 | /* | |
2c06c99b | 1453 | * Close any extra open file descriptors so that we don't have them |
cdd66111 | 1454 | * hanging around in clients. Note that we want to do this after |
1455 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1456 | * descriptors open. | |
1457 | */ | |
1458 | for (i = 3; i < 64; i++) | |
1459 | close(i); | |
1460 | } | |
1461 | ||
e9a17296 | 1462 | /* |
1463 | * Performs common processing for the child, such as setting up the | |
1464 | * environment, closing extra file descriptors, setting the user and group | |
1465 | * ids, and executing the command or shell. | |
1466 | */ | |
1467 | void | |
1468 | do_child(Session *s, const char *command) | |
1469 | { | |
1470 | extern char **environ; | |
1471 | char **env; | |
1472 | char *argv[10]; | |
1473 | const char *shell, *shell0, *hostname = NULL; | |
1474 | struct passwd *pw = s->pw; | |
e9a17296 | 1475 | |
1476 | /* remove hostkey from the child's memory */ | |
1477 | destroy_sensitive_data(); | |
1478 | ||
cdd66111 | 1479 | /* Force a password change */ |
1480 | if (s->authctxt->force_pwchange) { | |
1481 | do_setusercontext(pw); | |
1482 | child_close_fds(); | |
1483 | do_pwchange(s); | |
1484 | exit(1); | |
1485 | } | |
1486 | ||
e9a17296 | 1487 | /* login(1) is only called if we execute the login shell */ |
1488 | if (options.use_login && command != NULL) | |
1489 | options.use_login = 0; | |
1490 | ||
41b2f314 | 1491 | #ifdef _UNICOS |
1492 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1493 | #endif /* _UNICOS */ | |
1494 | ||
e9a17296 | 1495 | /* |
1496 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1497 | * switch, so we let login(1) to this for us. | |
1498 | */ | |
1499 | if (!options.use_login) { | |
1500 | #ifdef HAVE_OSF_SIA | |
6a9b3198 | 1501 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
e9a17296 | 1502 | if (!check_quietlogin(s, command)) |
1503 | do_motd(); | |
1504 | #else /* HAVE_OSF_SIA */ | |
2c06c99b | 1505 | /* When PAM is enabled we rely on it to do the nologin check */ |
1506 | if (!options.use_pam) | |
1507 | do_nologin(pw); | |
e9a17296 | 1508 | do_setusercontext(pw); |
c9f39d2c | 1509 | /* |
1510 | * PAM session modules in do_setusercontext may have | |
1511 | * generated messages, so if this in an interactive | |
1512 | * login then display them too. | |
1513 | */ | |
996d5e62 | 1514 | if (!check_quietlogin(s, command)) |
c9f39d2c | 1515 | display_loginmsg(); |
e9a17296 | 1516 | #endif /* HAVE_OSF_SIA */ |
1517 | } | |
1518 | ||
996d5e62 | 1519 | #ifdef USE_PAM |
dec6d9fe | 1520 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1521 | debug3("PAM session not opened, exiting"); | |
996d5e62 | 1522 | display_loginmsg(); |
1523 | exit(254); | |
1524 | } | |
1525 | #endif | |
1526 | ||
e9a17296 | 1527 | /* |
1528 | * Get the shell from the password data. An empty shell field is | |
1529 | * legal, and means /bin/sh. | |
1530 | */ | |
1531 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
6a9b3198 | 1532 | |
1533 | /* | |
1534 | * Make sure $SHELL points to the shell from the password file, | |
1535 | * even if shell is overridden from login.conf | |
1536 | */ | |
1537 | env = do_setup_env(s, shell); | |
1538 | ||
e9a17296 | 1539 | #ifdef HAVE_LOGIN_CAP |
1540 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1541 | #endif | |
1542 | ||
3c0ef626 | 1543 | /* we have to stash the hostname before we close our socket. */ |
1544 | if (options.use_login) | |
1545 | hostname = get_remote_name_or_ip(utmp_len, | |
0fff78ff | 1546 | options.use_dns); |
3c0ef626 | 1547 | /* |
1548 | * Close the connection descriptors; note that this is the child, and | |
1549 | * the server will still have the socket open, and it is important | |
1550 | * that we do not shutdown it. Note that the descriptors cannot be | |
1551 | * closed before building the environment, as we call | |
1552 | * get_remote_ipaddr there. | |
1553 | */ | |
cdd66111 | 1554 | child_close_fds(); |
3c0ef626 | 1555 | |
1556 | /* | |
cdd66111 | 1557 | * Must take new environment into use so that .ssh/rc, |
1558 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
3c0ef626 | 1559 | */ |
cdd66111 | 1560 | environ = env; |
3c0ef626 | 1561 | |
cdd66111 | 1562 | #if defined(KRB5) && defined(USE_AFS) |
3c0ef626 | 1563 | /* |
cdd66111 | 1564 | * At this point, we check to see if AFS is active and if we have |
1565 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1566 | * if we can (and need to) extend the ticket into an AFS token. If | |
1567 | * we don't do this, we run into potential problems if the user's | |
1568 | * home directory is in AFS and it's not world-readable. | |
3c0ef626 | 1569 | */ |
3c0ef626 | 1570 | |
cdd66111 | 1571 | if (options.kerberos_get_afs_token && k_hasafs() && |
665a873d | 1572 | (s->authctxt->krb5_ctx != NULL)) { |
cdd66111 | 1573 | char cell[64]; |
1574 | ||
1575 | debug("Getting AFS token"); | |
1576 | ||
1577 | k_setpag(); | |
1578 | ||
1579 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1580 | krb5_afslog(s->authctxt->krb5_ctx, | |
1581 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1582 | ||
1583 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1584 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1585 | } | |
1586 | #endif | |
3c0ef626 | 1587 | |
2c06c99b | 1588 | /* Change current directory to the user's home directory. */ |
3c0ef626 | 1589 | if (chdir(pw->pw_dir) < 0) { |
1590 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1591 | pw->pw_dir, strerror(errno)); | |
1592 | #ifdef HAVE_LOGIN_CAP | |
1593 | if (login_getcapbool(lc, "requirehome", 0)) | |
1594 | exit(1); | |
1595 | #endif | |
1596 | } | |
1597 | ||
e9a17296 | 1598 | if (!options.use_login) |
1599 | do_rc_files(s, shell); | |
3c0ef626 | 1600 | |
1601 | /* restore SIGPIPE for child */ | |
9108f8d9 | 1602 | signal(SIGPIPE, SIG_DFL); |
3c0ef626 | 1603 | |
e9a17296 | 1604 | if (options.use_login) { |
700318f3 | 1605 | launch_login(pw, hostname); |
1606 | /* NEVERREACHED */ | |
e9a17296 | 1607 | } |
1608 | ||
1609 | /* Get the last component of the shell name. */ | |
1610 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1611 | shell0++; | |
1612 | else | |
1613 | shell0 = shell; | |
1614 | ||
3c0ef626 | 1615 | /* |
1616 | * If we have no command, execute the shell. In this case, the shell | |
1617 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1618 | * this is a login shell. | |
1619 | */ | |
1620 | if (!command) { | |
e9a17296 | 1621 | char argv0[256]; |
3c0ef626 | 1622 | |
e9a17296 | 1623 | /* Start the shell. Set initial character to '-'. */ |
1624 | argv0[0] = '-'; | |
3c0ef626 | 1625 | |
e9a17296 | 1626 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1627 | >= sizeof(argv0) - 1) { | |
1628 | errno = EINVAL; | |
3c0ef626 | 1629 | perror(shell); |
1630 | exit(1); | |
e9a17296 | 1631 | } |
3c0ef626 | 1632 | |
e9a17296 | 1633 | /* Execute the shell. */ |
1634 | argv[0] = argv0; | |
1635 | argv[1] = NULL; | |
1636 | execve(shell, argv, env); | |
3c0ef626 | 1637 | |
e9a17296 | 1638 | /* Executing the shell failed. */ |
1639 | perror(shell); | |
1640 | exit(1); | |
3c0ef626 | 1641 | } |
1642 | /* | |
1643 | * Execute the command using the user's shell. This uses the -c | |
1644 | * option to execute the command. | |
1645 | */ | |
e9a17296 | 1646 | argv[0] = (char *) shell0; |
3c0ef626 | 1647 | argv[1] = "-c"; |
1648 | argv[2] = (char *) command; | |
1649 | argv[3] = NULL; | |
1650 | execve(shell, argv, env); | |
1651 | perror(shell); | |
1652 | exit(1); | |
1653 | } | |
1654 | ||
1655 | Session * | |
1656 | session_new(void) | |
1657 | { | |
1658 | int i; | |
1659 | static int did_init = 0; | |
1660 | if (!did_init) { | |
1661 | debug("session_new: init"); | |
e9a17296 | 1662 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1663 | sessions[i].used = 0; |
1664 | } | |
1665 | did_init = 1; | |
1666 | } | |
e9a17296 | 1667 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1668 | Session *s = &sessions[i]; |
1669 | if (! s->used) { | |
1670 | memset(s, 0, sizeof(*s)); | |
1671 | s->chanid = -1; | |
1672 | s->ptyfd = -1; | |
1673 | s->ttyfd = -1; | |
1674 | s->used = 1; | |
1675 | s->self = i; | |
665a873d | 1676 | s->x11_chanids = NULL; |
3c0ef626 | 1677 | debug("session_new: session %d", i); |
1678 | return s; | |
1679 | } | |
1680 | } | |
1681 | return NULL; | |
1682 | } | |
1683 | ||
1684 | static void | |
1685 | session_dump(void) | |
1686 | { | |
1687 | int i; | |
e9a17296 | 1688 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1689 | Session *s = &sessions[i]; |
f5799ae1 | 1690 | debug("dump: used %d session %d %p channel %d pid %ld", |
3c0ef626 | 1691 | s->used, |
1692 | s->self, | |
1693 | s, | |
1694 | s->chanid, | |
f5799ae1 | 1695 | (long)s->pid); |
3c0ef626 | 1696 | } |
1697 | } | |
1698 | ||
1699 | int | |
1700 | session_open(Authctxt *authctxt, int chanid) | |
1701 | { | |
1702 | Session *s = session_new(); | |
1703 | debug("session_open: channel %d", chanid); | |
1704 | if (s == NULL) { | |
1705 | error("no more sessions"); | |
1706 | return 0; | |
1707 | } | |
1708 | s->authctxt = authctxt; | |
1709 | s->pw = authctxt->pw; | |
cdd66111 | 1710 | if (s->pw == NULL || !authctxt->valid) |
3c0ef626 | 1711 | fatal("no user for session %d", s->self); |
1712 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1713 | s->chanid = chanid; | |
1714 | return 1; | |
1715 | } | |
1716 | ||
700318f3 | 1717 | Session * |
1718 | session_by_tty(char *tty) | |
1719 | { | |
1720 | int i; | |
1721 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1722 | Session *s = &sessions[i]; | |
1723 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1724 | debug("session_by_tty: session %d tty %s", i, tty); | |
1725 | return s; | |
1726 | } | |
1727 | } | |
1728 | debug("session_by_tty: unknown tty %.100s", tty); | |
1729 | session_dump(); | |
1730 | return NULL; | |
1731 | } | |
1732 | ||
3c0ef626 | 1733 | static Session * |
1734 | session_by_channel(int id) | |
1735 | { | |
1736 | int i; | |
e9a17296 | 1737 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1738 | Session *s = &sessions[i]; |
1739 | if (s->used && s->chanid == id) { | |
1740 | debug("session_by_channel: session %d channel %d", i, id); | |
1741 | return s; | |
1742 | } | |
1743 | } | |
1744 | debug("session_by_channel: unknown channel %d", id); | |
1745 | session_dump(); | |
1746 | return NULL; | |
1747 | } | |
1748 | ||
665a873d | 1749 | static Session * |
1750 | session_by_x11_channel(int id) | |
1751 | { | |
1752 | int i, j; | |
1753 | ||
1754 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1755 | Session *s = &sessions[i]; | |
1756 | ||
1757 | if (s->x11_chanids == NULL || !s->used) | |
1758 | continue; | |
1759 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
1760 | if (s->x11_chanids[j] == id) { | |
1761 | debug("session_by_x11_channel: session %d " | |
1762 | "channel %d", s->self, id); | |
1763 | return s; | |
1764 | } | |
1765 | } | |
1766 | } | |
1767 | debug("session_by_x11_channel: unknown channel %d", id); | |
1768 | session_dump(); | |
1769 | return NULL; | |
1770 | } | |
1771 | ||
3c0ef626 | 1772 | static Session * |
1773 | session_by_pid(pid_t pid) | |
1774 | { | |
1775 | int i; | |
f5799ae1 | 1776 | debug("session_by_pid: pid %ld", (long)pid); |
e9a17296 | 1777 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1778 | Session *s = &sessions[i]; |
1779 | if (s->used && s->pid == pid) | |
1780 | return s; | |
1781 | } | |
f5799ae1 | 1782 | error("session_by_pid: unknown pid %ld", (long)pid); |
3c0ef626 | 1783 | session_dump(); |
1784 | return NULL; | |
1785 | } | |
1786 | ||
1787 | static int | |
1788 | session_window_change_req(Session *s) | |
1789 | { | |
1790 | s->col = packet_get_int(); | |
1791 | s->row = packet_get_int(); | |
1792 | s->xpixel = packet_get_int(); | |
1793 | s->ypixel = packet_get_int(); | |
e9a17296 | 1794 | packet_check_eom(); |
3c0ef626 | 1795 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1796 | return 1; | |
1797 | } | |
1798 | ||
1799 | static int | |
1800 | session_pty_req(Session *s) | |
1801 | { | |
1802 | u_int len; | |
1803 | int n_bytes; | |
1804 | ||
1805 | if (no_pty_flag) { | |
1806 | debug("Allocating a pty not permitted for this authentication."); | |
1807 | return 0; | |
1808 | } | |
1809 | if (s->ttyfd != -1) { | |
1810 | packet_disconnect("Protocol error: you already have a pty."); | |
1811 | return 0; | |
1812 | } | |
1813 | ||
1814 | s->term = packet_get_string(&len); | |
1815 | ||
1816 | if (compat20) { | |
1817 | s->col = packet_get_int(); | |
1818 | s->row = packet_get_int(); | |
1819 | } else { | |
1820 | s->row = packet_get_int(); | |
1821 | s->col = packet_get_int(); | |
1822 | } | |
1823 | s->xpixel = packet_get_int(); | |
1824 | s->ypixel = packet_get_int(); | |
1825 | ||
1826 | if (strcmp(s->term, "") == 0) { | |
1827 | xfree(s->term); | |
1828 | s->term = NULL; | |
1829 | } | |
1830 | ||
1831 | /* Allocate a pty and open it. */ | |
1832 | debug("Allocating pty."); | |
700318f3 | 1833 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
3c0ef626 | 1834 | if (s->term) |
1835 | xfree(s->term); | |
1836 | s->term = NULL; | |
1837 | s->ptyfd = -1; | |
1838 | s->ttyfd = -1; | |
1839 | error("session_pty_req: session %d alloc failed", s->self); | |
1840 | return 0; | |
1841 | } | |
1842 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1843 | ||
1844 | /* for SSH1 the tty modes length is not given */ | |
1845 | if (!compat20) | |
1846 | n_bytes = packet_remaining(); | |
1847 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1848 | ||
700318f3 | 1849 | if (!use_privsep) |
1850 | pty_setowner(s->pw, s->tty); | |
3c0ef626 | 1851 | |
1852 | /* Set window size from the packet. */ | |
1853 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1854 | ||
e9a17296 | 1855 | packet_check_eom(); |
3c0ef626 | 1856 | session_proctitle(s); |
1857 | return 1; | |
1858 | } | |
1859 | ||
1860 | static int | |
1861 | session_subsystem_req(Session *s) | |
1862 | { | |
1863 | struct stat st; | |
1864 | u_int len; | |
1865 | int success = 0; | |
9108f8d9 | 1866 | char *prog, *cmd, *subsys = packet_get_string(&len); |
665a873d | 1867 | u_int i; |
3c0ef626 | 1868 | |
e9a17296 | 1869 | packet_check_eom(); |
0fff78ff | 1870 | logit("subsystem request for %.100s", subsys); |
3c0ef626 | 1871 | |
1872 | for (i = 0; i < options.num_subsystems; i++) { | |
1873 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { | |
9108f8d9 | 1874 | prog = options.subsystem_command[i]; |
1875 | cmd = options.subsystem_args[i]; | |
1876 | if (stat(prog, &st) < 0) { | |
1877 | error("subsystem: cannot stat %s: %s", prog, | |
3c0ef626 | 1878 | strerror(errno)); |
1879 | break; | |
1880 | } | |
1881 | debug("subsystem: exec() %s", cmd); | |
1882 | s->is_subsystem = 1; | |
1883 | do_exec(s, cmd); | |
1884 | success = 1; | |
e9a17296 | 1885 | break; |
3c0ef626 | 1886 | } |
1887 | } | |
1888 | ||
1889 | if (!success) | |
0fff78ff | 1890 | logit("subsystem request for %.100s failed, subsystem not found", |
3c0ef626 | 1891 | subsys); |
1892 | ||
1893 | xfree(subsys); | |
1894 | return success; | |
1895 | } | |
1896 | ||
1897 | static int | |
1898 | session_x11_req(Session *s) | |
1899 | { | |
1900 | int success; | |
1901 | ||
665a873d | 1902 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
1903 | error("session_x11_req: session %d: " | |
2c06c99b | 1904 | "x11 forwarding already active", s->self); |
665a873d | 1905 | return 0; |
1906 | } | |
3c0ef626 | 1907 | s->single_connection = packet_get_char(); |
1908 | s->auth_proto = packet_get_string(NULL); | |
1909 | s->auth_data = packet_get_string(NULL); | |
1910 | s->screen = packet_get_int(); | |
e9a17296 | 1911 | packet_check_eom(); |
3c0ef626 | 1912 | |
1913 | success = session_setup_x11fwd(s); | |
1914 | if (!success) { | |
1915 | xfree(s->auth_proto); | |
1916 | xfree(s->auth_data); | |
1917 | s->auth_proto = NULL; | |
1918 | s->auth_data = NULL; | |
1919 | } | |
1920 | return success; | |
1921 | } | |
1922 | ||
1923 | static int | |
1924 | session_shell_req(Session *s) | |
1925 | { | |
e9a17296 | 1926 | packet_check_eom(); |
3c0ef626 | 1927 | do_exec(s, NULL); |
1928 | return 1; | |
1929 | } | |
1930 | ||
1931 | static int | |
1932 | session_exec_req(Session *s) | |
1933 | { | |
1934 | u_int len; | |
1935 | char *command = packet_get_string(&len); | |
e9a17296 | 1936 | packet_check_eom(); |
3c0ef626 | 1937 | do_exec(s, command); |
1938 | xfree(command); | |
1939 | return 1; | |
1940 | } | |
1941 | ||
0fff78ff | 1942 | static int |
1943 | session_break_req(Session *s) | |
1944 | { | |
0fff78ff | 1945 | |
c9f39d2c | 1946 | packet_get_int(); /* ignored */ |
0fff78ff | 1947 | packet_check_eom(); |
1948 | ||
1949 | if (s->ttyfd == -1 || | |
1950 | tcsendbreak(s->ttyfd, 0) < 0) | |
1951 | return 0; | |
1952 | return 1; | |
1953 | } | |
1954 | ||
c9f39d2c | 1955 | static int |
1956 | session_env_req(Session *s) | |
1957 | { | |
1958 | char *name, *val; | |
1959 | u_int name_len, val_len, i; | |
1960 | ||
1961 | name = packet_get_string(&name_len); | |
1962 | val = packet_get_string(&val_len); | |
1963 | packet_check_eom(); | |
1964 | ||
1965 | /* Don't set too many environment variables */ | |
1966 | if (s->num_env > 128) { | |
1967 | debug2("Ignoring env request %s: too many env vars", name); | |
1968 | goto fail; | |
1969 | } | |
1970 | ||
1971 | for (i = 0; i < options.num_accept_env; i++) { | |
1972 | if (match_pattern(name, options.accept_env[i])) { | |
1973 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
9108f8d9 | 1974 | s->env = xrealloc(s->env, s->num_env + 1, |
1975 | sizeof(*s->env)); | |
c9f39d2c | 1976 | s->env[s->num_env].name = name; |
1977 | s->env[s->num_env].val = val; | |
1978 | s->num_env++; | |
1979 | return (1); | |
1980 | } | |
1981 | } | |
1982 | debug2("Ignoring env request %s: disallowed name", name); | |
1983 | ||
1984 | fail: | |
1985 | xfree(name); | |
1986 | xfree(val); | |
1987 | return (0); | |
1988 | } | |
1989 | ||
3c0ef626 | 1990 | static int |
1991 | session_auth_agent_req(Session *s) | |
1992 | { | |
1993 | static int called = 0; | |
e9a17296 | 1994 | packet_check_eom(); |
3c0ef626 | 1995 | if (no_agent_forwarding_flag) { |
1996 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1997 | return 0; | |
1998 | } | |
1999 | if (called) { | |
2000 | return 0; | |
2001 | } else { | |
2002 | called = 1; | |
2003 | return auth_input_request_forwarding(s->pw); | |
2004 | } | |
2005 | } | |
2006 | ||
e9a17296 | 2007 | int |
2008 | session_input_channel_req(Channel *c, const char *rtype) | |
3c0ef626 | 2009 | { |
3c0ef626 | 2010 | int success = 0; |
3c0ef626 | 2011 | Session *s; |
3c0ef626 | 2012 | |
e9a17296 | 2013 | if ((s = session_by_channel(c->self)) == NULL) { |
0fff78ff | 2014 | logit("session_input_channel_req: no session %d req %.100s", |
e9a17296 | 2015 | c->self, rtype); |
2016 | return 0; | |
2017 | } | |
2018 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
3c0ef626 | 2019 | |
2020 | /* | |
2021 | * a session is in LARVAL state until a shell, a command | |
2022 | * or a subsystem is executed | |
2023 | */ | |
2024 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2025 | if (strcmp(rtype, "shell") == 0) { | |
2026 | success = session_shell_req(s); | |
2027 | } else if (strcmp(rtype, "exec") == 0) { | |
2028 | success = session_exec_req(s); | |
2029 | } else if (strcmp(rtype, "pty-req") == 0) { | |
2030 | success = session_pty_req(s); | |
2031 | } else if (strcmp(rtype, "x11-req") == 0) { | |
2032 | success = session_x11_req(s); | |
2033 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { | |
2034 | success = session_auth_agent_req(s); | |
2035 | } else if (strcmp(rtype, "subsystem") == 0) { | |
2036 | success = session_subsystem_req(s); | |
c9f39d2c | 2037 | } else if (strcmp(rtype, "env") == 0) { |
2038 | success = session_env_req(s); | |
3c0ef626 | 2039 | } |
2040 | } | |
2041 | if (strcmp(rtype, "window-change") == 0) { | |
2042 | success = session_window_change_req(s); | |
c9f39d2c | 2043 | } else if (strcmp(rtype, "break") == 0) { |
2044 | success = session_break_req(s); | |
3c0ef626 | 2045 | } |
c9f39d2c | 2046 | |
e9a17296 | 2047 | return success; |
3c0ef626 | 2048 | } |
2049 | ||
2050 | void | |
2051 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2052 | { | |
2053 | if (!compat20) | |
2054 | fatal("session_set_fds: called for proto != 2.0"); | |
2055 | /* | |
2056 | * now that have a child and a pipe to the child, | |
2057 | * we can activate our channel and register the fd's | |
2058 | */ | |
2059 | if (s->chanid == -1) | |
2060 | fatal("no channel for session %d", s->self); | |
2061 | channel_set_fds(s->chanid, | |
2062 | fdout, fdin, fderr, | |
2063 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
e9a17296 | 2064 | 1, |
2065 | CHAN_SES_WINDOW_DEFAULT); | |
3c0ef626 | 2066 | } |
2067 | ||
2068 | /* | |
2069 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2070 | * (e.g., due to a dropped connection). | |
2071 | */ | |
700318f3 | 2072 | void |
cdd66111 | 2073 | session_pty_cleanup2(Session *s) |
3c0ef626 | 2074 | { |
3c0ef626 | 2075 | if (s == NULL) { |
2076 | error("session_pty_cleanup: no session"); | |
2077 | return; | |
2078 | } | |
2079 | if (s->ttyfd == -1) | |
2080 | return; | |
2081 | ||
2082 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); | |
2083 | ||
2084 | /* Record that the user has logged out. */ | |
2085 | if (s->pid != 0) | |
e9a17296 | 2086 | record_logout(s->pid, s->tty, s->pw->pw_name); |
3c0ef626 | 2087 | |
2088 | /* Release the pseudo-tty. */ | |
700318f3 | 2089 | if (getuid() == 0) |
2090 | pty_release(s->tty); | |
3c0ef626 | 2091 | |
2092 | /* | |
2093 | * Close the server side of the socket pairs. We must do this after | |
2094 | * the pty cleanup, so that another process doesn't get this pty | |
2095 | * while we're still cleaning up. | |
2096 | */ | |
2097 | if (close(s->ptymaster) < 0) | |
700318f3 | 2098 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
3c0ef626 | 2099 | |
2100 | /* unlink pty from session */ | |
2101 | s->ttyfd = -1; | |
2102 | } | |
2103 | ||
700318f3 | 2104 | void |
cdd66111 | 2105 | session_pty_cleanup(Session *s) |
700318f3 | 2106 | { |
cdd66111 | 2107 | PRIVSEP(session_pty_cleanup2(s)); |
700318f3 | 2108 | } |
2109 | ||
41b2f314 | 2110 | static char * |
2111 | sig2name(int sig) | |
2112 | { | |
2113 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2114 | SSH_SIG(ABRT); | |
2115 | SSH_SIG(ALRM); | |
2116 | SSH_SIG(FPE); | |
2117 | SSH_SIG(HUP); | |
2118 | SSH_SIG(ILL); | |
2119 | SSH_SIG(INT); | |
2120 | SSH_SIG(KILL); | |
2121 | SSH_SIG(PIPE); | |
2122 | SSH_SIG(QUIT); | |
2123 | SSH_SIG(SEGV); | |
2124 | SSH_SIG(TERM); | |
2125 | SSH_SIG(USR1); | |
2126 | SSH_SIG(USR2); | |
2127 | #undef SSH_SIG | |
2128 | return "SIG@openssh.com"; | |
2129 | } | |
2130 | ||
665a873d | 2131 | static void |
2132 | session_close_x11(int id) | |
2133 | { | |
2134 | Channel *c; | |
2135 | ||
2c06c99b | 2136 | if ((c = channel_by_id(id)) == NULL) { |
665a873d | 2137 | debug("session_close_x11: x11 channel %d missing", id); |
2138 | } else { | |
2139 | /* Detach X11 listener */ | |
2140 | debug("session_close_x11: detach x11 channel %d", id); | |
2141 | channel_cancel_cleanup(id); | |
2142 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2143 | chan_mark_dead(c); | |
2144 | } | |
2145 | } | |
2146 | ||
2147 | static void | |
2148 | session_close_single_x11(int id, void *arg) | |
2149 | { | |
2150 | Session *s; | |
2151 | u_int i; | |
2152 | ||
2153 | debug3("session_close_single_x11: channel %d", id); | |
2154 | channel_cancel_cleanup(id); | |
2155 | if ((s = session_by_x11_channel(id)) == NULL) | |
2156 | fatal("session_close_single_x11: no x11 channel %d", id); | |
2157 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2158 | debug("session_close_single_x11: session %d: " | |
2159 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2160 | /* | |
2161 | * The channel "id" is already closing, but make sure we | |
2162 | * close all of its siblings. | |
2163 | */ | |
2164 | if (s->x11_chanids[i] != id) | |
2165 | session_close_x11(s->x11_chanids[i]); | |
2166 | } | |
2167 | xfree(s->x11_chanids); | |
2168 | s->x11_chanids = NULL; | |
2169 | if (s->display) { | |
2170 | xfree(s->display); | |
2171 | s->display = NULL; | |
2172 | } | |
2173 | if (s->auth_proto) { | |
2174 | xfree(s->auth_proto); | |
2175 | s->auth_proto = NULL; | |
2176 | } | |
2177 | if (s->auth_data) { | |
2178 | xfree(s->auth_data); | |
2179 | s->auth_data = NULL; | |
2180 | } | |
2181 | if (s->auth_display) { | |
2182 | xfree(s->auth_display); | |
2183 | s->auth_display = NULL; | |
2184 | } | |
2185 | } | |
2186 | ||
3c0ef626 | 2187 | static void |
2188 | session_exit_message(Session *s, int status) | |
2189 | { | |
2190 | Channel *c; | |
e9a17296 | 2191 | |
2192 | if ((c = channel_lookup(s->chanid)) == NULL) | |
3c0ef626 | 2193 | fatal("session_exit_message: session %d: no channel %d", |
2194 | s->self, s->chanid); | |
f5799ae1 | 2195 | debug("session_exit_message: session %d channel %d pid %ld", |
2196 | s->self, s->chanid, (long)s->pid); | |
3c0ef626 | 2197 | |
2198 | if (WIFEXITED(status)) { | |
e9a17296 | 2199 | channel_request_start(s->chanid, "exit-status", 0); |
3c0ef626 | 2200 | packet_put_int(WEXITSTATUS(status)); |
2201 | packet_send(); | |
2202 | } else if (WIFSIGNALED(status)) { | |
e9a17296 | 2203 | channel_request_start(s->chanid, "exit-signal", 0); |
41b2f314 | 2204 | packet_put_cstring(sig2name(WTERMSIG(status))); |
3c0ef626 | 2205 | #ifdef WCOREDUMP |
2206 | packet_put_char(WCOREDUMP(status)); | |
2207 | #else /* WCOREDUMP */ | |
2208 | packet_put_char(0); | |
2209 | #endif /* WCOREDUMP */ | |
2210 | packet_put_cstring(""); | |
2211 | packet_put_cstring(""); | |
2212 | packet_send(); | |
2213 | } else { | |
2214 | /* Some weird exit cause. Just exit. */ | |
2215 | packet_disconnect("wait returned status %04x.", status); | |
2216 | } | |
2217 | ||
2218 | /* disconnect channel */ | |
2219 | debug("session_exit_message: release channel %d", s->chanid); | |
2c06c99b | 2220 | |
2221 | /* | |
2222 | * Adjust cleanup callback attachment to send close messages when | |
9108f8d9 | 2223 | * the channel gets EOF. The session will be then be closed |
2c06c99b | 2224 | * by session_close_by_channel when the childs close their fds. |
2225 | */ | |
2226 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2227 | ||
3c0ef626 | 2228 | /* |
2229 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2230 | * interested in data we write. | |
2231 | * Note that we must not call 'chan_read_failed', since there could | |
2232 | * be some more data waiting in the pipe. | |
2233 | */ | |
2234 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2235 | chan_write_failed(c); | |
3c0ef626 | 2236 | } |
2237 | ||
700318f3 | 2238 | void |
3c0ef626 | 2239 | session_close(Session *s) |
2240 | { | |
665a873d | 2241 | u_int i; |
c9f39d2c | 2242 | |
f5799ae1 | 2243 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
cdd66111 | 2244 | if (s->ttyfd != -1) |
3c0ef626 | 2245 | session_pty_cleanup(s); |
3c0ef626 | 2246 | if (s->term) |
2247 | xfree(s->term); | |
2248 | if (s->display) | |
2249 | xfree(s->display); | |
665a873d | 2250 | if (s->x11_chanids) |
2251 | xfree(s->x11_chanids); | |
e9a17296 | 2252 | if (s->auth_display) |
2253 | xfree(s->auth_display); | |
3c0ef626 | 2254 | if (s->auth_data) |
2255 | xfree(s->auth_data); | |
2256 | if (s->auth_proto) | |
2257 | xfree(s->auth_proto); | |
2258 | s->used = 0; | |
9108f8d9 | 2259 | if (s->env != NULL) { |
2260 | for (i = 0; i < s->num_env; i++) { | |
2261 | xfree(s->env[i].name); | |
2262 | xfree(s->env[i].val); | |
2263 | } | |
c9f39d2c | 2264 | xfree(s->env); |
9108f8d9 | 2265 | } |
3c0ef626 | 2266 | session_proctitle(s); |
2267 | } | |
2268 | ||
2269 | void | |
2270 | session_close_by_pid(pid_t pid, int status) | |
2271 | { | |
2272 | Session *s = session_by_pid(pid); | |
2273 | if (s == NULL) { | |
f5799ae1 | 2274 | debug("session_close_by_pid: no session for pid %ld", |
2275 | (long)pid); | |
3c0ef626 | 2276 | return; |
2277 | } | |
2278 | if (s->chanid != -1) | |
2279 | session_exit_message(s, status); | |
2c06c99b | 2280 | if (s->ttyfd != -1) |
2281 | session_pty_cleanup(s); | |
f2f068fa | 2282 | s->pid = 0; |
3c0ef626 | 2283 | } |
2284 | ||
2285 | /* | |
2286 | * this is called when a channel dies before | |
2287 | * the session 'child' itself dies | |
2288 | */ | |
2289 | void | |
2290 | session_close_by_channel(int id, void *arg) | |
2291 | { | |
2292 | Session *s = session_by_channel(id); | |
2c06c99b | 2293 | u_int i; |
665a873d | 2294 | |
3c0ef626 | 2295 | if (s == NULL) { |
2296 | debug("session_close_by_channel: no session for id %d", id); | |
2297 | return; | |
2298 | } | |
f5799ae1 | 2299 | debug("session_close_by_channel: channel %d child %ld", |
2300 | id, (long)s->pid); | |
3c0ef626 | 2301 | if (s->pid != 0) { |
2302 | debug("session_close_by_channel: channel %d: has child", id); | |
2303 | /* | |
2304 | * delay detach of session, but release pty, since | |
2305 | * the fd's to the child are already closed | |
2306 | */ | |
cdd66111 | 2307 | if (s->ttyfd != -1) |
3c0ef626 | 2308 | session_pty_cleanup(s); |
3c0ef626 | 2309 | return; |
2310 | } | |
2311 | /* detach by removing callback */ | |
2312 | channel_cancel_cleanup(s->chanid); | |
2c06c99b | 2313 | |
2314 | /* Close any X11 listeners associated with this session */ | |
2315 | if (s->x11_chanids != NULL) { | |
2316 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2317 | session_close_x11(s->x11_chanids[i]); | |
2318 | s->x11_chanids[i] = -1; | |
2319 | } | |
2320 | } | |
2321 | ||
3c0ef626 | 2322 | s->chanid = -1; |
2323 | session_close(s); | |
2324 | } | |
2325 | ||
2326 | void | |
700318f3 | 2327 | session_destroy_all(void (*closefunc)(Session *)) |
3c0ef626 | 2328 | { |
2329 | int i; | |
e9a17296 | 2330 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2331 | Session *s = &sessions[i]; |
700318f3 | 2332 | if (s->used) { |
2333 | if (closefunc != NULL) | |
2334 | closefunc(s); | |
2335 | else | |
2336 | session_close(s); | |
2337 | } | |
3c0ef626 | 2338 | } |
2339 | } | |
2340 | ||
2341 | static char * | |
2342 | session_tty_list(void) | |
2343 | { | |
2344 | static char buf[1024]; | |
2345 | int i; | |
6a9b3198 | 2346 | char *cp; |
2347 | ||
3c0ef626 | 2348 | buf[0] = '\0'; |
e9a17296 | 2349 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2350 | Session *s = &sessions[i]; |
2351 | if (s->used && s->ttyfd != -1) { | |
cdd66111 | 2352 | |
6a9b3198 | 2353 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2354 | cp = strrchr(s->tty, '/'); | |
2355 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2356 | } else | |
2357 | cp = s->tty + 5; | |
cdd66111 | 2358 | |
3c0ef626 | 2359 | if (buf[0] != '\0') |
2360 | strlcat(buf, ",", sizeof buf); | |
6a9b3198 | 2361 | strlcat(buf, cp, sizeof buf); |
3c0ef626 | 2362 | } |
2363 | } | |
2364 | if (buf[0] == '\0') | |
2365 | strlcpy(buf, "notty", sizeof buf); | |
2366 | return buf; | |
2367 | } | |
2368 | ||
2369 | void | |
2370 | session_proctitle(Session *s) | |
2371 | { | |
2372 | if (s->pw == NULL) | |
2373 | error("no user for session %d", s->self); | |
2374 | else | |
2375 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2376 | } | |
2377 | ||
2378 | int | |
2379 | session_setup_x11fwd(Session *s) | |
2380 | { | |
2381 | struct stat st; | |
e9a17296 | 2382 | char display[512], auth_display[512]; |
2383 | char hostname[MAXHOSTNAMELEN]; | |
665a873d | 2384 | u_int i; |
3c0ef626 | 2385 | |
2386 | if (no_x11_forwarding_flag) { | |
2387 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2388 | return 0; | |
2389 | } | |
2390 | if (!options.x11_forwarding) { | |
2391 | debug("X11 forwarding disabled in server configuration file."); | |
2392 | return 0; | |
2393 | } | |
2394 | if (!options.xauth_location || | |
2395 | (stat(options.xauth_location, &st) == -1)) { | |
2396 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2397 | return 0; | |
2398 | } | |
2399 | if (options.use_login) { | |
2400 | packet_send_debug("X11 forwarding disabled; " | |
2401 | "not compatible with UseLogin=yes."); | |
2402 | return 0; | |
2403 | } | |
2404 | if (s->display != NULL) { | |
2405 | debug("X11 display already set."); | |
2406 | return 0; | |
2407 | } | |
680cee3b | 2408 | if (x11_create_display_inet(options.x11_display_offset, |
2409 | options.x11_use_localhost, s->single_connection, | |
665a873d | 2410 | &s->display_number, &s->x11_chanids) == -1) { |
3c0ef626 | 2411 | debug("x11_create_display_inet failed."); |
2412 | return 0; | |
2413 | } | |
665a873d | 2414 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2415 | channel_register_cleanup(s->x11_chanids[i], | |
2c06c99b | 2416 | session_close_single_x11, 0); |
665a873d | 2417 | } |
e9a17296 | 2418 | |
2419 | /* Set up a suitable value for the DISPLAY variable. */ | |
2420 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2421 | fatal("gethostname: %.100s", strerror(errno)); | |
2422 | /* | |
2423 | * auth_display must be used as the displayname when the | |
2424 | * authorization entry is added with xauth(1). This will be | |
2425 | * different than the DISPLAY string for localhost displays. | |
2426 | */ | |
2427 | if (options.x11_use_localhost) { | |
680cee3b | 2428 | snprintf(display, sizeof display, "localhost:%u.%u", |
e9a17296 | 2429 | s->display_number, s->screen); |
680cee3b | 2430 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
e9a17296 | 2431 | s->display_number, s->screen); |
2432 | s->display = xstrdup(display); | |
2433 | s->auth_display = xstrdup(auth_display); | |
2434 | } else { | |
2435 | #ifdef IPADDR_IN_DISPLAY | |
2436 | struct hostent *he; | |
2437 | struct in_addr my_addr; | |
2438 | ||
2439 | he = gethostbyname(hostname); | |
2440 | if (he == NULL) { | |
2441 | error("Can't get IP address for X11 DISPLAY."); | |
2442 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2443 | return 0; | |
2444 | } | |
2445 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
680cee3b | 2446 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
e9a17296 | 2447 | s->display_number, s->screen); |
2448 | #else | |
680cee3b | 2449 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
e9a17296 | 2450 | s->display_number, s->screen); |
2451 | #endif | |
2452 | s->display = xstrdup(display); | |
2453 | s->auth_display = xstrdup(display); | |
2454 | } | |
2455 | ||
3c0ef626 | 2456 | return 1; |
2457 | } | |
2458 | ||
2459 | static void | |
2460 | do_authenticated2(Authctxt *authctxt) | |
2461 | { | |
2462 | server_loop2(authctxt); | |
cdd66111 | 2463 | } |
2464 | ||
2465 | void | |
2466 | do_cleanup(Authctxt *authctxt) | |
2467 | { | |
2468 | static int called = 0; | |
2469 | ||
2470 | debug("do_cleanup"); | |
2471 | ||
2472 | /* no cleanup if we're in the child for login shell */ | |
2473 | if (is_child) | |
2474 | return; | |
2475 | ||
2476 | /* avoid double cleanup */ | |
2477 | if (called) | |
2478 | return; | |
2479 | called = 1; | |
2480 | ||
9108f8d9 | 2481 | if (authctxt == NULL || !authctxt->authenticated) |
cdd66111 | 2482 | return; |
2483 | #ifdef KRB5 | |
2484 | if (options.kerberos_ticket_cleanup && | |
2485 | authctxt->krb5_ctx) | |
2486 | krb5_cleanup_proc(authctxt); | |
0fff78ff | 2487 | #endif |
cdd66111 | 2488 | |
2489 | #ifdef GSSAPI | |
2490 | if (compat20 && options.gss_cleanup_creds) | |
2491 | ssh_gssapi_cleanup_creds(); | |
2492 | #endif | |
2493 | ||
2494 | #ifdef USE_PAM | |
2495 | if (options.use_pam) { | |
2496 | sshpam_cleanup(); | |
2497 | sshpam_thread_cleanup(); | |
2498 | } | |
2499 | #endif | |
2500 | ||
2501 | /* remove agent socket */ | |
2502 | auth_sock_cleanup_proc(authctxt->pw); | |
2503 | ||
2504 | /* | |
2505 | * Cleanup ptys/utmp only if privsep is disabled, | |
2506 | * or if running in monitor. | |
2507 | */ | |
2508 | if (!use_privsep || mm_is_monitor()) | |
2509 | session_destroy_all(session_pty_cleanup2); | |
3c0ef626 | 2510 | } |