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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. */ | |
d6f3ca1e | 214 | /* this shouldn't matter if its hpn or not - cjr */ |
f5799ae1 | 215 | nc = channel_new("auth socket", |
216 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
217 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0fff78ff | 218 | 0, "auth socket", 1); |
f5799ae1 | 219 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
220 | return 1; | |
221 | } | |
222 | ||
cdd66111 | 223 | static void |
224 | display_loginmsg(void) | |
225 | { | |
665a873d | 226 | if (buffer_len(&loginmsg) > 0) { |
227 | buffer_append(&loginmsg, "\0", 1); | |
228 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
229 | buffer_clear(&loginmsg); | |
230 | } | |
cdd66111 | 231 | } |
f5799ae1 | 232 | |
3c0ef626 | 233 | void |
234 | do_authenticated(Authctxt *authctxt) | |
235 | { | |
6a9b3198 | 236 | setproctitle("%s", authctxt->pw->pw_name); |
237 | ||
3c0ef626 | 238 | /* setup the channel layer */ |
239 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
240 | channel_permit_all_opens(); | |
241 | ||
242 | if (compat20) | |
243 | do_authenticated2(authctxt); | |
244 | else | |
245 | do_authenticated1(authctxt); | |
246 | ||
cdd66111 | 247 | do_cleanup(authctxt); |
3c0ef626 | 248 | } |
249 | ||
250 | /* | |
251 | * Prepares for an interactive session. This is called after the user has | |
252 | * been successfully authenticated. During this message exchange, pseudo | |
253 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
254 | * are requested, etc. | |
255 | */ | |
256 | static void | |
257 | do_authenticated1(Authctxt *authctxt) | |
258 | { | |
259 | Session *s; | |
260 | char *command; | |
e9a17296 | 261 | int success, type, screen_flag; |
680cee3b | 262 | int enable_compression_after_reply = 0; |
263 | u_int proto_len, data_len, dlen, compression_level = 0; | |
3c0ef626 | 264 | |
265 | s = session_new(); | |
996d5e62 | 266 | if (s == NULL) { |
267 | error("no more sessions"); | |
268 | return; | |
269 | } | |
3c0ef626 | 270 | s->authctxt = authctxt; |
271 | s->pw = authctxt->pw; | |
272 | ||
273 | /* | |
274 | * We stay in this loop until the client requests to execute a shell | |
275 | * or a command. | |
276 | */ | |
277 | for (;;) { | |
278 | success = 0; | |
279 | ||
280 | /* Get a packet from the client. */ | |
e9a17296 | 281 | type = packet_read(); |
3c0ef626 | 282 | |
283 | /* Process the packet. */ | |
284 | switch (type) { | |
285 | case SSH_CMSG_REQUEST_COMPRESSION: | |
3c0ef626 | 286 | compression_level = packet_get_int(); |
e9a17296 | 287 | packet_check_eom(); |
3c0ef626 | 288 | if (compression_level < 1 || compression_level > 9) { |
c9f39d2c | 289 | packet_send_debug("Received invalid compression level %d.", |
e9a17296 | 290 | compression_level); |
3c0ef626 | 291 | break; |
292 | } | |
665a873d | 293 | if (options.compression == COMP_NONE) { |
f5799ae1 | 294 | debug2("compression disabled"); |
295 | break; | |
296 | } | |
3c0ef626 | 297 | /* Enable compression after we have responded with SUCCESS. */ |
298 | enable_compression_after_reply = 1; | |
299 | success = 1; | |
300 | break; | |
301 | ||
302 | case SSH_CMSG_REQUEST_PTY: | |
303 | success = session_pty_req(s); | |
304 | break; | |
305 | ||
306 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
307 | s->auth_proto = packet_get_string(&proto_len); | |
308 | s->auth_data = packet_get_string(&data_len); | |
309 | ||
310 | screen_flag = packet_get_protocol_flags() & | |
311 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
312 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
313 | ||
314 | if (packet_remaining() == 4) { | |
315 | if (!screen_flag) | |
316 | debug2("Buggy client: " | |
317 | "X11 screen flag missing"); | |
318 | s->screen = packet_get_int(); | |
319 | } else { | |
320 | s->screen = 0; | |
321 | } | |
e9a17296 | 322 | packet_check_eom(); |
3c0ef626 | 323 | success = session_setup_x11fwd(s); |
324 | if (!success) { | |
325 | xfree(s->auth_proto); | |
326 | xfree(s->auth_data); | |
327 | s->auth_proto = NULL; | |
328 | s->auth_data = NULL; | |
329 | } | |
330 | break; | |
331 | ||
332 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
333 | if (no_agent_forwarding_flag || compat13) { | |
334 | debug("Authentication agent forwarding not permitted for this authentication."); | |
335 | break; | |
336 | } | |
337 | debug("Received authentication agent forwarding request."); | |
338 | success = auth_input_request_forwarding(s->pw); | |
339 | break; | |
340 | ||
341 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
342 | if (no_port_forwarding_flag) { | |
343 | debug("Port forwarding not permitted for this authentication."); | |
344 | break; | |
345 | } | |
346 | if (!options.allow_tcp_forwarding) { | |
347 | debug("Port forwarding not permitted."); | |
348 | break; | |
349 | } | |
350 | debug("Received TCP/IP port forwarding request."); | |
9108f8d9 | 351 | if (channel_input_port_forward_request(s->pw->pw_uid == 0, |
d6f3ca1e | 352 | options.gateway_ports, options.hpn_disabled, |
353 | options.hpn_buffer_size) < 0) { | |
9108f8d9 | 354 | debug("Port forwarding failed."); |
355 | break; | |
356 | } | |
3c0ef626 | 357 | success = 1; |
358 | break; | |
359 | ||
360 | case SSH_CMSG_MAX_PACKET_SIZE: | |
361 | if (packet_set_maxsize(packet_get_int()) > 0) | |
362 | success = 1; | |
363 | break; | |
e9a17296 | 364 | |
3c0ef626 | 365 | case SSH_CMSG_EXEC_SHELL: |
366 | case SSH_CMSG_EXEC_CMD: | |
367 | if (type == SSH_CMSG_EXEC_CMD) { | |
368 | command = packet_get_string(&dlen); | |
369 | debug("Exec command '%.500s'", command); | |
370 | do_exec(s, command); | |
371 | xfree(command); | |
372 | } else { | |
373 | do_exec(s, NULL); | |
374 | } | |
e9a17296 | 375 | packet_check_eom(); |
3c0ef626 | 376 | session_close(s); |
377 | return; | |
378 | ||
379 | default: | |
380 | /* | |
381 | * Any unknown messages in this phase are ignored, | |
382 | * and a failure message is returned. | |
383 | */ | |
0fff78ff | 384 | logit("Unknown packet type received after authentication: %d", type); |
3c0ef626 | 385 | } |
386 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
387 | packet_send(); | |
388 | packet_write_wait(); | |
389 | ||
390 | /* Enable compression now that we have replied if appropriate. */ | |
391 | if (enable_compression_after_reply) { | |
392 | enable_compression_after_reply = 0; | |
393 | packet_start_compression(compression_level); | |
394 | } | |
395 | } | |
396 | } | |
397 | ||
398 | /* | |
399 | * This is called to fork and execute a command when we have no tty. This | |
400 | * will call do_child from the child, and server_loop from the parent after | |
401 | * setting up file descriptors and such. | |
402 | */ | |
403 | void | |
404 | do_exec_no_pty(Session *s, const char *command) | |
405 | { | |
f5799ae1 | 406 | pid_t pid; |
3c0ef626 | 407 | |
408 | #ifdef USE_PIPES | |
409 | int pin[2], pout[2], perr[2]; | |
410 | /* Allocate pipes for communicating with the program. */ | |
411 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
412 | packet_disconnect("Could not create pipes: %.100s", | |
413 | strerror(errno)); | |
414 | #else /* USE_PIPES */ | |
415 | int inout[2], err[2]; | |
416 | /* Uses socket pairs to communicate with the program. */ | |
417 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
418 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
419 | packet_disconnect("Could not create socket pairs: %.100s", | |
420 | strerror(errno)); | |
421 | #endif /* USE_PIPES */ | |
422 | if (s == NULL) | |
423 | fatal("do_exec_no_pty: no session"); | |
424 | ||
425 | session_proctitle(s); | |
426 | ||
427 | #if defined(USE_PAM) | |
cdd66111 | 428 | if (options.use_pam && !use_privsep) |
0fff78ff | 429 | do_pam_setcred(1); |
3c0ef626 | 430 | #endif /* USE_PAM */ |
431 | ||
432 | /* Fork the child. */ | |
433 | if ((pid = fork()) == 0) { | |
cdd66111 | 434 | is_child = 1; |
41b2f314 | 435 | |
3c0ef626 | 436 | /* Child. Reinitialize the log since the pid has changed. */ |
437 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
438 | ||
439 | /* | |
440 | * Create a new session and process group since the 4.4BSD | |
441 | * setlogin() affects the entire process group. | |
442 | */ | |
443 | if (setsid() < 0) | |
444 | error("setsid failed: %.100s", strerror(errno)); | |
445 | ||
446 | #ifdef USE_PIPES | |
447 | /* | |
448 | * Redirect stdin. We close the parent side of the socket | |
449 | * pair, and make the child side the standard input. | |
450 | */ | |
451 | close(pin[1]); | |
452 | if (dup2(pin[0], 0) < 0) | |
453 | perror("dup2 stdin"); | |
454 | close(pin[0]); | |
455 | ||
456 | /* Redirect stdout. */ | |
457 | close(pout[0]); | |
458 | if (dup2(pout[1], 1) < 0) | |
459 | perror("dup2 stdout"); | |
460 | close(pout[1]); | |
461 | ||
462 | /* Redirect stderr. */ | |
463 | close(perr[0]); | |
464 | if (dup2(perr[1], 2) < 0) | |
465 | perror("dup2 stderr"); | |
466 | close(perr[1]); | |
467 | #else /* USE_PIPES */ | |
468 | /* | |
469 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
470 | * use the same socket, as some programs (particularly rdist) | |
471 | * seem to depend on it. | |
472 | */ | |
473 | close(inout[1]); | |
474 | close(err[1]); | |
475 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
476 | perror("dup2 stdin"); | |
477 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
478 | perror("dup2 stdout"); | |
479 | if (dup2(err[0], 2) < 0) /* stderr */ | |
480 | perror("dup2 stderr"); | |
481 | #endif /* USE_PIPES */ | |
482 | ||
41b2f314 | 483 | #ifdef _UNICOS |
484 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
485 | #endif | |
486 | ||
3c0ef626 | 487 | /* Do processing for the child (exec command etc). */ |
488 | do_child(s, command); | |
489 | /* NOTREACHED */ | |
490 | } | |
41b2f314 | 491 | #ifdef _UNICOS |
492 | signal(WJSIGNAL, cray_job_termination_handler); | |
493 | #endif /* _UNICOS */ | |
3c0ef626 | 494 | #ifdef HAVE_CYGWIN |
495 | if (is_winnt) | |
496 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
497 | #endif | |
498 | if (pid < 0) | |
499 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
500 | s->pid = pid; | |
501 | /* Set interactive/non-interactive mode. */ | |
502 | packet_set_interactive(s->display != NULL); | |
503 | #ifdef USE_PIPES | |
504 | /* We are the parent. Close the child sides of the pipes. */ | |
505 | close(pin[0]); | |
506 | close(pout[1]); | |
507 | close(perr[1]); | |
508 | ||
509 | if (compat20) { | |
c9f39d2c | 510 | if (s->is_subsystem) { |
511 | close(perr[0]); | |
512 | perr[0] = -1; | |
513 | } | |
514 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
3c0ef626 | 515 | } else { |
516 | /* Enter the interactive session. */ | |
517 | server_loop(pid, pin[1], pout[0], perr[0]); | |
518 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ | |
519 | } | |
520 | #else /* USE_PIPES */ | |
521 | /* We are the parent. Close the child sides of the socket pairs. */ | |
522 | close(inout[0]); | |
523 | close(err[0]); | |
524 | ||
99be0775 | 525 | /* |
526 | * Clear loginmsg, since it's the child's responsibility to display | |
527 | * it to the user, otherwise multiple sessions may accumulate | |
528 | * multiple copies of the login messages. | |
529 | */ | |
530 | buffer_clear(&loginmsg); | |
531 | ||
3c0ef626 | 532 | /* |
533 | * Enter the interactive session. Note: server_loop must be able to | |
534 | * handle the case that fdin and fdout are the same. | |
535 | */ | |
536 | if (compat20) { | |
537 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); | |
538 | } else { | |
539 | server_loop(pid, inout[1], inout[1], err[1]); | |
540 | /* server_loop has closed inout[1] and err[1]. */ | |
541 | } | |
542 | #endif /* USE_PIPES */ | |
543 | } | |
544 | ||
545 | /* | |
546 | * This is called to fork and execute a command when we have a tty. This | |
547 | * will call do_child from the child, and server_loop from the parent after | |
548 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
549 | * lastlog, and other such operations. | |
550 | */ | |
551 | void | |
552 | do_exec_pty(Session *s, const char *command) | |
553 | { | |
554 | int fdout, ptyfd, ttyfd, ptymaster; | |
555 | pid_t pid; | |
556 | ||
557 | if (s == NULL) | |
558 | fatal("do_exec_pty: no session"); | |
559 | ptyfd = s->ptyfd; | |
560 | ttyfd = s->ttyfd; | |
561 | ||
562 | #if defined(USE_PAM) | |
0fff78ff | 563 | if (options.use_pam) { |
564 | do_pam_set_tty(s->tty); | |
cdd66111 | 565 | if (!use_privsep) |
566 | do_pam_setcred(1); | |
0fff78ff | 567 | } |
3c0ef626 | 568 | #endif |
569 | ||
570 | /* Fork the child. */ | |
571 | if ((pid = fork()) == 0) { | |
cdd66111 | 572 | is_child = 1; |
3c0ef626 | 573 | |
574 | /* Child. Reinitialize the log because the pid has changed. */ | |
575 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
576 | /* Close the master side of the pseudo tty. */ | |
577 | close(ptyfd); | |
578 | ||
579 | /* Make the pseudo tty our controlling tty. */ | |
580 | pty_make_controlling_tty(&ttyfd, s->tty); | |
581 | ||
582 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ | |
583 | if (dup2(ttyfd, 0) < 0) | |
584 | error("dup2 stdin: %s", strerror(errno)); | |
585 | if (dup2(ttyfd, 1) < 0) | |
586 | error("dup2 stdout: %s", strerror(errno)); | |
587 | if (dup2(ttyfd, 2) < 0) | |
588 | error("dup2 stderr: %s", strerror(errno)); | |
589 | ||
590 | /* Close the extra descriptor for the pseudo tty. */ | |
591 | close(ttyfd); | |
592 | ||
593 | /* record login, etc. similar to login(1) */ | |
594 | #ifndef HAVE_OSF_SIA | |
41b2f314 | 595 | if (!(options.use_login && command == NULL)) { |
596 | #ifdef _UNICOS | |
597 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
598 | #endif /* _UNICOS */ | |
3c0ef626 | 599 | do_login(s, command); |
41b2f314 | 600 | } |
3c0ef626 | 601 | # ifdef LOGIN_NEEDS_UTMPX |
602 | else | |
603 | do_pre_login(s); | |
604 | # endif | |
605 | #endif | |
606 | ||
607 | /* Do common processing for the child, such as execing the command. */ | |
608 | do_child(s, command); | |
609 | /* NOTREACHED */ | |
610 | } | |
41b2f314 | 611 | #ifdef _UNICOS |
612 | signal(WJSIGNAL, cray_job_termination_handler); | |
613 | #endif /* _UNICOS */ | |
3c0ef626 | 614 | #ifdef HAVE_CYGWIN |
615 | if (is_winnt) | |
616 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
617 | #endif | |
618 | if (pid < 0) | |
619 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
620 | s->pid = pid; | |
621 | ||
622 | /* Parent. Close the slave side of the pseudo tty. */ | |
623 | close(ttyfd); | |
624 | ||
625 | /* | |
626 | * Create another descriptor of the pty master side for use as the | |
627 | * standard input. We could use the original descriptor, but this | |
628 | * simplifies code in server_loop. The descriptor is bidirectional. | |
629 | */ | |
630 | fdout = dup(ptyfd); | |
631 | if (fdout < 0) | |
632 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
633 | ||
634 | /* we keep a reference to the pty master */ | |
635 | ptymaster = dup(ptyfd); | |
636 | if (ptymaster < 0) | |
637 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
638 | s->ptymaster = ptymaster; | |
639 | ||
640 | /* Enter interactive session. */ | |
641 | packet_set_interactive(1); | |
642 | if (compat20) { | |
643 | session_set_fds(s, ptyfd, fdout, -1); | |
644 | } else { | |
645 | server_loop(pid, ptyfd, fdout, -1); | |
646 | /* server_loop _has_ closed ptyfd and fdout. */ | |
647 | } | |
648 | } | |
649 | ||
650 | #ifdef LOGIN_NEEDS_UTMPX | |
651 | static void | |
652 | do_pre_login(Session *s) | |
653 | { | |
654 | socklen_t fromlen; | |
655 | struct sockaddr_storage from; | |
656 | pid_t pid = getpid(); | |
657 | ||
658 | /* | |
659 | * Get IP address of client. If the connection is not a socket, let | |
660 | * the address be 0.0.0.0. | |
661 | */ | |
662 | memset(&from, 0, sizeof(from)); | |
41b2f314 | 663 | fromlen = sizeof(from); |
3c0ef626 | 664 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 665 | if (getpeername(packet_get_connection_in(), |
9108f8d9 | 666 | (struct sockaddr *)&from, &fromlen) < 0) { |
3c0ef626 | 667 | debug("getpeername: %.100s", strerror(errno)); |
cdd66111 | 668 | cleanup_exit(255); |
3c0ef626 | 669 | } |
670 | } | |
671 | ||
672 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
0fff78ff | 673 | get_remote_name_or_ip(utmp_len, options.use_dns), |
6a9b3198 | 674 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 675 | } |
676 | #endif | |
677 | ||
678 | /* | |
679 | * This is called to fork and execute a command. If another command is | |
680 | * to be forced, execute that instead. | |
681 | */ | |
682 | void | |
683 | do_exec(Session *s, const char *command) | |
684 | { | |
9108f8d9 | 685 | if (options.adm_forced_command) { |
686 | original_command = command; | |
687 | command = options.adm_forced_command; | |
688 | debug("Forced command (config) '%.900s'", command); | |
689 | } else if (forced_command) { | |
3c0ef626 | 690 | original_command = command; |
691 | command = forced_command; | |
9108f8d9 | 692 | debug("Forced command (key option) '%.900s'", command); |
3c0ef626 | 693 | } |
694 | ||
996d5e62 | 695 | #ifdef SSH_AUDIT_EVENTS |
696 | if (command != NULL) | |
697 | PRIVSEP(audit_run_command(command)); | |
698 | else if (s->ttyfd == -1) { | |
699 | char *shell = s->pw->pw_shell; | |
700 | ||
701 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
702 | shell =_PATH_BSHELL; | |
703 | PRIVSEP(audit_run_command(shell)); | |
0fff78ff | 704 | } |
705 | #endif | |
706 | ||
3c0ef626 | 707 | if (s->ttyfd != -1) |
708 | do_exec_pty(s, command); | |
709 | else | |
710 | do_exec_no_pty(s, command); | |
711 | ||
712 | original_command = NULL; | |
3c0ef626 | 713 | |
c9f39d2c | 714 | /* |
715 | * Clear loginmsg: it's the child's responsibility to display | |
716 | * it to the user, otherwise multiple sessions may accumulate | |
717 | * multiple copies of the login messages. | |
718 | */ | |
719 | buffer_clear(&loginmsg); | |
720 | } | |
e9a17296 | 721 | |
3c0ef626 | 722 | /* administrative, login(1)-like work */ |
723 | void | |
724 | do_login(Session *s, const char *command) | |
725 | { | |
3c0ef626 | 726 | socklen_t fromlen; |
727 | struct sockaddr_storage from; | |
3c0ef626 | 728 | struct passwd * pw = s->pw; |
729 | pid_t pid = getpid(); | |
730 | ||
731 | /* | |
732 | * Get IP address of client. If the connection is not a socket, let | |
733 | * the address be 0.0.0.0. | |
734 | */ | |
735 | memset(&from, 0, sizeof(from)); | |
6a9b3198 | 736 | fromlen = sizeof(from); |
3c0ef626 | 737 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 738 | if (getpeername(packet_get_connection_in(), |
e9a17296 | 739 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 740 | debug("getpeername: %.100s", strerror(errno)); |
cdd66111 | 741 | cleanup_exit(255); |
3c0ef626 | 742 | } |
743 | } | |
744 | ||
3c0ef626 | 745 | /* Record that there was a login on that tty from the remote host. */ |
700318f3 | 746 | if (!use_privsep) |
747 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
748 | get_remote_name_or_ip(utmp_len, | |
0fff78ff | 749 | options.use_dns), |
41b2f314 | 750 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 751 | |
752 | #ifdef USE_PAM | |
753 | /* | |
754 | * If password change is needed, do it now. | |
755 | * This needs to occur before the ~/.hushlogin check. | |
756 | */ | |
cdd66111 | 757 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
758 | display_loginmsg(); | |
3c0ef626 | 759 | do_pam_chauthtok(); |
cdd66111 | 760 | s->authctxt->force_pwchange = 0; |
0fff78ff | 761 | /* XXX - signal [net] parent to enable forwardings */ |
3c0ef626 | 762 | } |
763 | #endif | |
764 | ||
765 | if (check_quietlogin(s, command)) | |
766 | return; | |
767 | ||
cdd66111 | 768 | display_loginmsg(); |
3c0ef626 | 769 | |
3c0ef626 | 770 | do_motd(); |
771 | } | |
772 | ||
773 | /* | |
774 | * Display the message of the day. | |
775 | */ | |
776 | void | |
777 | do_motd(void) | |
778 | { | |
779 | FILE *f; | |
780 | char buf[256]; | |
781 | ||
782 | if (options.print_motd) { | |
783 | #ifdef HAVE_LOGIN_CAP | |
784 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
785 | "/etc/motd"), "r"); | |
786 | #else | |
787 | f = fopen("/etc/motd", "r"); | |
788 | #endif | |
789 | if (f) { | |
790 | while (fgets(buf, sizeof(buf), f)) | |
791 | fputs(buf, stdout); | |
792 | fclose(f); | |
793 | } | |
794 | } | |
795 | } | |
796 | ||
797 | ||
798 | /* | |
799 | * Check for quiet login, either .hushlogin or command given. | |
800 | */ | |
801 | int | |
802 | check_quietlogin(Session *s, const char *command) | |
803 | { | |
804 | char buf[256]; | |
805 | struct passwd *pw = s->pw; | |
806 | struct stat st; | |
807 | ||
808 | /* Return 1 if .hushlogin exists or a command given. */ | |
809 | if (command != NULL) | |
810 | return 1; | |
811 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
812 | #ifdef HAVE_LOGIN_CAP | |
813 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
814 | return 1; | |
815 | #else | |
816 | if (stat(buf, &st) >= 0) | |
817 | return 1; | |
818 | #endif | |
819 | return 0; | |
820 | } | |
821 | ||
822 | /* | |
823 | * Sets the value of the given variable in the environment. If the variable | |
824 | * already exists, its value is overriden. | |
825 | */ | |
0fff78ff | 826 | void |
3c0ef626 | 827 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
e9a17296 | 828 | const char *value) |
3c0ef626 | 829 | { |
3c0ef626 | 830 | char **env; |
acc3d05e | 831 | u_int envsize; |
832 | u_int i, namelen; | |
3c0ef626 | 833 | |
0fff78ff | 834 | /* |
835 | * If we're passed an uninitialized list, allocate a single null | |
836 | * entry before continuing. | |
837 | */ | |
838 | if (*envp == NULL && *envsizep == 0) { | |
839 | *envp = xmalloc(sizeof(char *)); | |
840 | *envp[0] = NULL; | |
841 | *envsizep = 1; | |
842 | } | |
843 | ||
3c0ef626 | 844 | /* |
845 | * Find the slot where the value should be stored. If the variable | |
846 | * already exists, we reuse the slot; otherwise we append a new slot | |
847 | * at the end of the array, expanding if necessary. | |
848 | */ | |
849 | env = *envp; | |
850 | namelen = strlen(name); | |
851 | for (i = 0; env[i]; i++) | |
852 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
853 | break; | |
854 | if (env[i]) { | |
855 | /* Reuse the slot. */ | |
856 | xfree(env[i]); | |
857 | } else { | |
858 | /* New variable. Expand if necessary. */ | |
acc3d05e | 859 | envsize = *envsizep; |
860 | if (i >= envsize - 1) { | |
861 | if (envsize >= 1000) | |
862 | fatal("child_set_env: too many env vars"); | |
863 | envsize += 50; | |
9108f8d9 | 864 | env = (*envp) = xrealloc(env, envsize, sizeof(char *)); |
acc3d05e | 865 | *envsizep = envsize; |
3c0ef626 | 866 | } |
867 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
868 | env[i + 1] = NULL; | |
869 | } | |
870 | ||
871 | /* Allocate space and format the variable in the appropriate slot. */ | |
872 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
873 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
874 | } | |
875 | ||
876 | /* | |
877 | * Reads environment variables from the given file and adds/overrides them | |
878 | * into the environment. If the file does not exist, this does nothing. | |
879 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
880 | * and assignments of the form name=value. No other forms are allowed. | |
881 | */ | |
882 | static void | |
883 | read_environment_file(char ***env, u_int *envsize, | |
e9a17296 | 884 | const char *filename) |
3c0ef626 | 885 | { |
886 | FILE *f; | |
887 | char buf[4096]; | |
888 | char *cp, *value; | |
680cee3b | 889 | u_int lineno = 0; |
3c0ef626 | 890 | |
891 | f = fopen(filename, "r"); | |
892 | if (!f) | |
893 | return; | |
894 | ||
895 | while (fgets(buf, sizeof(buf), f)) { | |
680cee3b | 896 | if (++lineno > 1000) |
897 | fatal("Too many lines in environment file %s", filename); | |
3c0ef626 | 898 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
899 | ; | |
900 | if (!*cp || *cp == '#' || *cp == '\n') | |
901 | continue; | |
902 | if (strchr(cp, '\n')) | |
903 | *strchr(cp, '\n') = '\0'; | |
904 | value = strchr(cp, '='); | |
905 | if (value == NULL) { | |
680cee3b | 906 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
907 | filename); | |
3c0ef626 | 908 | continue; |
909 | } | |
910 | /* | |
911 | * Replace the equals sign by nul, and advance value to | |
912 | * the value string. | |
913 | */ | |
914 | *value = '\0'; | |
915 | value++; | |
916 | child_set_env(env, envsize, cp, value); | |
917 | } | |
918 | fclose(f); | |
919 | } | |
920 | ||
0fff78ff | 921 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
922 | /* | |
923 | * Return named variable from specified environment, or NULL if not present. | |
924 | */ | |
925 | static char * | |
926 | child_get_env(char **env, const char *name) | |
927 | { | |
928 | int i; | |
929 | size_t len; | |
930 | ||
931 | len = strlen(name); | |
932 | for (i=0; env[i] != NULL; i++) | |
933 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
934 | return(env[i] + len + 1); | |
935 | return NULL; | |
936 | } | |
937 | ||
938 | /* | |
939 | * Read /etc/default/login. | |
940 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
941 | */ | |
942 | static void | |
943 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
944 | { | |
945 | char **tmpenv = NULL, *var; | |
acc3d05e | 946 | u_int i, tmpenvsize = 0; |
cdd66111 | 947 | u_long mask; |
0fff78ff | 948 | |
949 | /* | |
950 | * We don't want to copy the whole file to the child's environment, | |
951 | * so we use a temporary environment and copy the variables we're | |
952 | * interested in. | |
953 | */ | |
954 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
955 | ||
acc3d05e | 956 | if (tmpenv == NULL) |
957 | return; | |
958 | ||
0fff78ff | 959 | if (uid == 0) |
960 | var = child_get_env(tmpenv, "SUPATH"); | |
961 | else | |
962 | var = child_get_env(tmpenv, "PATH"); | |
963 | if (var != NULL) | |
964 | child_set_env(env, envsize, "PATH", var); | |
cdd66111 | 965 | |
0fff78ff | 966 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
967 | if (sscanf(var, "%5lo", &mask) == 1) | |
cdd66111 | 968 | umask((mode_t)mask); |
969 | ||
0fff78ff | 970 | for (i = 0; tmpenv[i] != NULL; i++) |
971 | xfree(tmpenv[i]); | |
972 | xfree(tmpenv); | |
973 | } | |
974 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
975 | ||
665a873d | 976 | void |
977 | copy_environment(char **source, char ***env, u_int *envsize) | |
3c0ef626 | 978 | { |
e9a17296 | 979 | char *var_name, *var_val; |
3c0ef626 | 980 | int i; |
981 | ||
e9a17296 | 982 | if (source == NULL) |
3c0ef626 | 983 | return; |
984 | ||
e9a17296 | 985 | for(i = 0; source[i] != NULL; i++) { |
986 | var_name = xstrdup(source[i]); | |
987 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
988 | xfree(var_name); | |
3c0ef626 | 989 | continue; |
3c0ef626 | 990 | } |
e9a17296 | 991 | *var_val++ = '\0'; |
3c0ef626 | 992 | |
e9a17296 | 993 | debug3("Copy environment: %s=%s", var_name, var_val); |
994 | child_set_env(env, envsize, var_name, var_val); | |
cdd66111 | 995 | |
e9a17296 | 996 | xfree(var_name); |
3c0ef626 | 997 | } |
998 | } | |
3c0ef626 | 999 | |
e9a17296 | 1000 | static char ** |
1001 | do_setup_env(Session *s, const char *shell) | |
3c0ef626 | 1002 | { |
3c0ef626 | 1003 | char buf[256]; |
e9a17296 | 1004 | u_int i, envsize; |
9108f8d9 | 1005 | char **env, *laddr; |
e9a17296 | 1006 | struct passwd *pw = s->pw; |
9108f8d9 | 1007 | #ifndef HAVE_LOGIN_CAP |
1008 | char *path = NULL; | |
1009 | #endif | |
3c0ef626 | 1010 | |
1011 | /* Initialize the environment. */ | |
1012 | envsize = 100; | |
9108f8d9 | 1013 | env = xcalloc(envsize, sizeof(char *)); |
3c0ef626 | 1014 | env[0] = NULL; |
1015 | ||
1016 | #ifdef HAVE_CYGWIN | |
1017 | /* | |
1018 | * The Windows environment contains some setting which are | |
1019 | * important for a running system. They must not be dropped. | |
1020 | */ | |
996d5e62 | 1021 | { |
1022 | char **p; | |
1023 | ||
1024 | p = fetch_windows_environment(); | |
1025 | copy_environment(p, &env, &envsize); | |
1026 | free_windows_environment(p); | |
1027 | } | |
3c0ef626 | 1028 | #endif |
1029 | ||
0fff78ff | 1030 | #ifdef GSSAPI |
cdd66111 | 1031 | /* Allow any GSSAPI methods that we've used to alter |
0fff78ff | 1032 | * the childs environment as they see fit |
1033 | */ | |
1034 | ssh_gssapi_do_child(&env, &envsize); | |
1035 | #endif | |
1036 | ||
3c0ef626 | 1037 | if (!options.use_login) { |
1038 | /* Set basic environment. */ | |
c9f39d2c | 1039 | for (i = 0; i < s->num_env; i++) |
1040 | child_set_env(&env, &envsize, s->env[i].name, | |
1041 | s->env[i].val); | |
1042 | ||
3c0ef626 | 1043 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1044 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
6a9b3198 | 1045 | #ifdef _AIX |
1046 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1047 | #endif | |
3c0ef626 | 1048 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
1049 | #ifdef HAVE_LOGIN_CAP | |
41b2f314 | 1050 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1051 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1052 | else | |
1053 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
3c0ef626 | 1054 | #else /* HAVE_LOGIN_CAP */ |
1055 | # ifndef HAVE_CYGWIN | |
1056 | /* | |
1057 | * There's no standard path on Windows. The path contains | |
1058 | * important components pointing to the system directories, | |
1059 | * needed for loading shared libraries. So the path better | |
1060 | * remains intact here. | |
1061 | */ | |
0fff78ff | 1062 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1063 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1064 | path = child_get_env(env, "PATH"); | |
1065 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1066 | if (path == NULL || *path == '\0') { | |
cdd66111 | 1067 | child_set_env(&env, &envsize, "PATH", |
0fff78ff | 1068 | s->pw->pw_uid == 0 ? |
1069 | SUPERUSER_PATH : _PATH_STDPATH); | |
1070 | } | |
3c0ef626 | 1071 | # endif /* HAVE_CYGWIN */ |
1072 | #endif /* HAVE_LOGIN_CAP */ | |
1073 | ||
1074 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1075 | _PATH_MAILDIR, pw->pw_name); | |
1076 | child_set_env(&env, &envsize, "MAIL", buf); | |
1077 | ||
1078 | /* Normal systems set SHELL by default. */ | |
1079 | child_set_env(&env, &envsize, "SHELL", shell); | |
1080 | } | |
1081 | if (getenv("TZ")) | |
1082 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1083 | ||
1084 | /* Set custom environment options from RSA authentication. */ | |
1085 | if (!options.use_login) { | |
1086 | while (custom_environment) { | |
1087 | struct envstring *ce = custom_environment; | |
41b2f314 | 1088 | char *str = ce->s; |
e9a17296 | 1089 | |
41b2f314 | 1090 | for (i = 0; str[i] != '=' && str[i]; i++) |
3c0ef626 | 1091 | ; |
41b2f314 | 1092 | if (str[i] == '=') { |
1093 | str[i] = 0; | |
1094 | child_set_env(&env, &envsize, str, str + i + 1); | |
3c0ef626 | 1095 | } |
1096 | custom_environment = ce->next; | |
1097 | xfree(ce->s); | |
1098 | xfree(ce); | |
1099 | } | |
1100 | } | |
1101 | ||
41b2f314 | 1102 | /* SSH_CLIENT deprecated */ |
3c0ef626 | 1103 | snprintf(buf, sizeof buf, "%.50s %d %d", |
e9a17296 | 1104 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
3c0ef626 | 1105 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1106 | ||
6a9b3198 | 1107 | laddr = get_local_ipaddr(packet_get_connection_in()); |
41b2f314 | 1108 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
6a9b3198 | 1109 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1110 | xfree(laddr); | |
41b2f314 | 1111 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1112 | ||
3c0ef626 | 1113 | if (s->ttyfd != -1) |
1114 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1115 | if (s->term) | |
1116 | child_set_env(&env, &envsize, "TERM", s->term); | |
1117 | if (s->display) | |
1118 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
1119 | if (original_command) | |
1120 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1121 | original_command); | |
1122 | ||
41b2f314 | 1123 | #ifdef _UNICOS |
1124 | if (cray_tmpdir[0] != '\0') | |
1125 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1126 | #endif /* _UNICOS */ | |
1127 | ||
996d5e62 | 1128 | /* |
1129 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1130 | * must have been set by a native authentication method (eg AIX or | |
1131 | * SIA), so copy it to the child. | |
1132 | */ | |
1133 | { | |
1134 | char *cp; | |
1135 | ||
1136 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1137 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1138 | } | |
1139 | ||
3c0ef626 | 1140 | #ifdef _AIX |
e9a17296 | 1141 | { |
1142 | char *cp; | |
1143 | ||
1144 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1145 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
e9a17296 | 1146 | read_environment_file(&env, &envsize, "/etc/environment"); |
1147 | } | |
3c0ef626 | 1148 | #endif |
3c0ef626 | 1149 | #ifdef KRB5 |
99be0775 | 1150 | if (s->authctxt->krb5_ccname) |
3c0ef626 | 1151 | child_set_env(&env, &envsize, "KRB5CCNAME", |
99be0775 | 1152 | s->authctxt->krb5_ccname); |
3c0ef626 | 1153 | #endif |
1154 | #ifdef USE_PAM | |
41b2f314 | 1155 | /* |
1156 | * Pull in any environment variables that may have | |
1157 | * been set by PAM. | |
1158 | */ | |
0fff78ff | 1159 | if (options.use_pam) { |
cdd66111 | 1160 | char **p; |
41b2f314 | 1161 | |
cdd66111 | 1162 | p = fetch_pam_child_environment(); |
1163 | copy_environment(p, &env, &envsize); | |
1164 | free_pam_environment(p); | |
1165 | ||
1166 | p = fetch_pam_environment(); | |
41b2f314 | 1167 | copy_environment(p, &env, &envsize); |
1168 | free_pam_environment(p); | |
1169 | } | |
3c0ef626 | 1170 | #endif /* USE_PAM */ |
1171 | ||
f5799ae1 | 1172 | if (auth_sock_name != NULL) |
3c0ef626 | 1173 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
f5799ae1 | 1174 | auth_sock_name); |
3c0ef626 | 1175 | |
1176 | /* read $HOME/.ssh/environment. */ | |
41b2f314 | 1177 | if (options.permit_user_env && !options.use_login) { |
3c0ef626 | 1178 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
41b2f314 | 1179 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
3c0ef626 | 1180 | read_environment_file(&env, &envsize, buf); |
1181 | } | |
1182 | if (debug_flag) { | |
1183 | /* dump the environment */ | |
1184 | fprintf(stderr, "Environment:\n"); | |
1185 | for (i = 0; env[i]; i++) | |
1186 | fprintf(stderr, " %.200s\n", env[i]); | |
1187 | } | |
e9a17296 | 1188 | return env; |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1193 | * first in this order). | |
1194 | */ | |
1195 | static void | |
1196 | do_rc_files(Session *s, const char *shell) | |
1197 | { | |
1198 | FILE *f = NULL; | |
1199 | char cmd[1024]; | |
1200 | int do_xauth; | |
1201 | struct stat st; | |
1202 | ||
1203 | do_xauth = | |
1204 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1205 | ||
1206 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1207 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1208 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1209 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1210 | if (debug_flag) | |
1211 | fprintf(stderr, "Running %s\n", cmd); | |
1212 | f = popen(cmd, "w"); | |
1213 | if (f) { | |
1214 | if (do_xauth) | |
1215 | fprintf(f, "%s %s\n", s->auth_proto, | |
1216 | s->auth_data); | |
1217 | pclose(f); | |
1218 | } else | |
1219 | fprintf(stderr, "Could not run %s\n", | |
1220 | _PATH_SSH_USER_RC); | |
1221 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1222 | if (debug_flag) | |
1223 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1224 | _PATH_SSH_SYSTEM_RC); | |
1225 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1226 | if (f) { | |
1227 | if (do_xauth) | |
1228 | fprintf(f, "%s %s\n", s->auth_proto, | |
1229 | s->auth_data); | |
1230 | pclose(f); | |
1231 | } else | |
1232 | fprintf(stderr, "Could not run %s\n", | |
1233 | _PATH_SSH_SYSTEM_RC); | |
1234 | } else if (do_xauth && options.xauth_location != NULL) { | |
1235 | /* Add authority data to .Xauthority if appropriate. */ | |
1236 | if (debug_flag) { | |
1237 | fprintf(stderr, | |
6a9b3198 | 1238 | "Running %.500s remove %.100s\n", |
cdd66111 | 1239 | options.xauth_location, s->auth_display); |
6a9b3198 | 1240 | fprintf(stderr, |
1241 | "%.500s add %.100s %.100s %.100s\n", | |
e9a17296 | 1242 | options.xauth_location, s->auth_display, |
1243 | s->auth_proto, s->auth_data); | |
1244 | } | |
1245 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1246 | options.xauth_location); | |
1247 | f = popen(cmd, "w"); | |
1248 | if (f) { | |
6a9b3198 | 1249 | fprintf(f, "remove %s\n", |
1250 | s->auth_display); | |
e9a17296 | 1251 | fprintf(f, "add %s %s %s\n", |
1252 | s->auth_display, s->auth_proto, | |
1253 | s->auth_data); | |
1254 | pclose(f); | |
1255 | } else { | |
1256 | fprintf(stderr, "Could not run %s\n", | |
1257 | cmd); | |
1258 | } | |
1259 | } | |
1260 | } | |
1261 | ||
1262 | static void | |
1263 | do_nologin(struct passwd *pw) | |
1264 | { | |
1265 | FILE *f = NULL; | |
1266 | char buf[1024]; | |
1267 | ||
1268 | #ifdef HAVE_LOGIN_CAP | |
1269 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1270 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1271 | _PATH_NOLOGIN), "r"); | |
1272 | #else | |
1273 | if (pw->pw_uid) | |
1274 | f = fopen(_PATH_NOLOGIN, "r"); | |
1275 | #endif | |
1276 | if (f) { | |
1277 | /* /etc/nologin exists. Print its contents and exit. */ | |
0fff78ff | 1278 | logit("User %.100s not allowed because %s exists", |
41b2f314 | 1279 | pw->pw_name, _PATH_NOLOGIN); |
e9a17296 | 1280 | while (fgets(buf, sizeof(buf), f)) |
1281 | fputs(buf, stderr); | |
1282 | fclose(f); | |
6a9b3198 | 1283 | fflush(NULL); |
e9a17296 | 1284 | exit(254); |
1285 | } | |
1286 | } | |
1287 | ||
1288 | /* Set login name, uid, gid, and groups. */ | |
700318f3 | 1289 | void |
e9a17296 | 1290 | do_setusercontext(struct passwd *pw) |
1291 | { | |
6a9b3198 | 1292 | #ifndef HAVE_CYGWIN |
1293 | if (getuid() == 0 || geteuid() == 0) | |
e9a17296 | 1294 | #endif /* HAVE_CYGWIN */ |
6a9b3198 | 1295 | { |
1296 | ||
f5799ae1 | 1297 | #ifdef HAVE_SETPCRED |
0fff78ff | 1298 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1299 | fatal("Failed to set process credentials"); | |
f5799ae1 | 1300 | #endif /* HAVE_SETPCRED */ |
e9a17296 | 1301 | #ifdef HAVE_LOGIN_CAP |
41b2f314 | 1302 | # ifdef __bsdi__ |
680cee3b | 1303 | setpgid(0, 0); |
41b2f314 | 1304 | # endif |
996d5e62 | 1305 | #ifdef GSSAPI |
1306 | if (options.gss_authentication) { | |
1307 | temporarily_use_uid(pw); | |
1308 | ssh_gssapi_storecreds(); | |
1309 | restore_uid(); | |
1310 | } | |
1311 | #endif | |
cdd66111 | 1312 | # ifdef USE_PAM |
1313 | if (options.use_pam) { | |
1314 | do_pam_session(); | |
1315 | do_pam_setcred(0); | |
1316 | } | |
1317 | # endif /* USE_PAM */ | |
e9a17296 | 1318 | if (setusercontext(lc, pw, pw->pw_uid, |
1319 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1320 | perror("unable to set user context"); | |
1321 | exit(1); | |
1322 | } | |
1323 | #else | |
1324 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1325 | /* Sets login uid for accounting */ | |
1326 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1327 | error("setluid: %s", strerror(errno)); | |
1328 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1329 | ||
1330 | if (setlogin(pw->pw_name) < 0) | |
1331 | error("setlogin failed: %s", strerror(errno)); | |
1332 | if (setgid(pw->pw_gid) < 0) { | |
1333 | perror("setgid"); | |
1334 | exit(1); | |
1335 | } | |
1336 | /* Initialize the group list. */ | |
1337 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1338 | perror("initgroups"); | |
1339 | exit(1); | |
1340 | } | |
1341 | endgrent(); | |
996d5e62 | 1342 | #ifdef GSSAPI |
1343 | if (options.gss_authentication) { | |
1344 | temporarily_use_uid(pw); | |
1345 | ssh_gssapi_storecreds(); | |
1346 | restore_uid(); | |
1347 | } | |
1348 | #endif | |
e9a17296 | 1349 | # ifdef USE_PAM |
1350 | /* | |
cdd66111 | 1351 | * PAM credentials may take the form of supplementary groups. |
e9a17296 | 1352 | * These will have been wiped by the above initgroups() call. |
1353 | * Reestablish them here. | |
1354 | */ | |
0fff78ff | 1355 | if (options.use_pam) { |
1356 | do_pam_session(); | |
1357 | do_pam_setcred(0); | |
1358 | } | |
e9a17296 | 1359 | # endif /* USE_PAM */ |
1360 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1361 | irix_setusercontext(pw); | |
1362 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
680cee3b | 1363 | # ifdef _AIX |
41b2f314 | 1364 | aix_usrinfo(pw); |
680cee3b | 1365 | # endif /* _AIX */ |
665a873d | 1366 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
1367 | if (set_id(pw->pw_name) != 0) { | |
1368 | exit(1); | |
1369 | } | |
1370 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ | |
e9a17296 | 1371 | /* Permanently switch to the desired uid. */ |
1372 | permanently_set_uid(pw); | |
1373 | #endif | |
1374 | } | |
6a9b3198 | 1375 | |
1376 | #ifdef HAVE_CYGWIN | |
1377 | if (is_winnt) | |
1378 | #endif | |
e9a17296 | 1379 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1380 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
9108f8d9 | 1381 | |
1382 | #ifdef WITH_SELINUX | |
1383 | ssh_selinux_setup_exec_context(pw->pw_name); | |
1384 | #endif | |
e9a17296 | 1385 | } |
1386 | ||
cdd66111 | 1387 | static void |
1388 | do_pwchange(Session *s) | |
1389 | { | |
c9f39d2c | 1390 | fflush(NULL); |
cdd66111 | 1391 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1392 | if (s->ttyfd != -1) { | |
c9f39d2c | 1393 | fprintf(stderr, |
cdd66111 | 1394 | "You must change your password now and login again!\n"); |
996d5e62 | 1395 | #ifdef PASSWD_NEEDS_USERNAME |
1396 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1397 | (char *)NULL); | |
1398 | #else | |
cdd66111 | 1399 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
996d5e62 | 1400 | #endif |
cdd66111 | 1401 | perror("passwd"); |
1402 | } else { | |
1403 | fprintf(stderr, | |
1404 | "Password change required but no TTY available.\n"); | |
1405 | } | |
1406 | exit(1); | |
1407 | } | |
1408 | ||
700318f3 | 1409 | static void |
1410 | launch_login(struct passwd *pw, const char *hostname) | |
1411 | { | |
1412 | /* Launch login(1). */ | |
1413 | ||
f5799ae1 | 1414 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
700318f3 | 1415 | #ifdef xxxLOGIN_NEEDS_TERM |
f5799ae1 | 1416 | (s->term ? s->term : "unknown"), |
700318f3 | 1417 | #endif /* LOGIN_NEEDS_TERM */ |
1418 | #ifdef LOGIN_NO_ENDOPT | |
1419 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1420 | #else | |
1421 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1422 | #endif | |
1423 | ||
1424 | /* Login couldn't be executed, die. */ | |
1425 | ||
1426 | perror("login"); | |
1427 | exit(1); | |
1428 | } | |
1429 | ||
cdd66111 | 1430 | static void |
1431 | child_close_fds(void) | |
1432 | { | |
1433 | int i; | |
1434 | ||
1435 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1436 | close(packet_get_connection_in()); | |
1437 | else { | |
1438 | close(packet_get_connection_in()); | |
1439 | close(packet_get_connection_out()); | |
1440 | } | |
1441 | /* | |
1442 | * Close all descriptors related to channels. They will still remain | |
1443 | * open in the parent. | |
1444 | */ | |
1445 | /* XXX better use close-on-exec? -markus */ | |
1446 | channel_close_all(); | |
1447 | ||
1448 | /* | |
1449 | * Close any extra file descriptors. Note that there may still be | |
1450 | * descriptors left by system functions. They will be closed later. | |
1451 | */ | |
1452 | endpwent(); | |
1453 | ||
1454 | /* | |
2c06c99b | 1455 | * Close any extra open file descriptors so that we don't have them |
cdd66111 | 1456 | * hanging around in clients. Note that we want to do this after |
1457 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1458 | * descriptors open. | |
1459 | */ | |
1460 | for (i = 3; i < 64; i++) | |
1461 | close(i); | |
1462 | } | |
1463 | ||
e9a17296 | 1464 | /* |
1465 | * Performs common processing for the child, such as setting up the | |
1466 | * environment, closing extra file descriptors, setting the user and group | |
1467 | * ids, and executing the command or shell. | |
1468 | */ | |
1469 | void | |
1470 | do_child(Session *s, const char *command) | |
1471 | { | |
1472 | extern char **environ; | |
1473 | char **env; | |
1474 | char *argv[10]; | |
1475 | const char *shell, *shell0, *hostname = NULL; | |
1476 | struct passwd *pw = s->pw; | |
e9a17296 | 1477 | |
1478 | /* remove hostkey from the child's memory */ | |
1479 | destroy_sensitive_data(); | |
1480 | ||
cdd66111 | 1481 | /* Force a password change */ |
1482 | if (s->authctxt->force_pwchange) { | |
1483 | do_setusercontext(pw); | |
1484 | child_close_fds(); | |
1485 | do_pwchange(s); | |
1486 | exit(1); | |
1487 | } | |
1488 | ||
e9a17296 | 1489 | /* login(1) is only called if we execute the login shell */ |
1490 | if (options.use_login && command != NULL) | |
1491 | options.use_login = 0; | |
1492 | ||
41b2f314 | 1493 | #ifdef _UNICOS |
1494 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1495 | #endif /* _UNICOS */ | |
1496 | ||
e9a17296 | 1497 | /* |
1498 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1499 | * switch, so we let login(1) to this for us. | |
1500 | */ | |
1501 | if (!options.use_login) { | |
1502 | #ifdef HAVE_OSF_SIA | |
6a9b3198 | 1503 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
e9a17296 | 1504 | if (!check_quietlogin(s, command)) |
1505 | do_motd(); | |
1506 | #else /* HAVE_OSF_SIA */ | |
2c06c99b | 1507 | /* When PAM is enabled we rely on it to do the nologin check */ |
1508 | if (!options.use_pam) | |
1509 | do_nologin(pw); | |
e9a17296 | 1510 | do_setusercontext(pw); |
c9f39d2c | 1511 | /* |
1512 | * PAM session modules in do_setusercontext may have | |
1513 | * generated messages, so if this in an interactive | |
1514 | * login then display them too. | |
1515 | */ | |
996d5e62 | 1516 | if (!check_quietlogin(s, command)) |
c9f39d2c | 1517 | display_loginmsg(); |
e9a17296 | 1518 | #endif /* HAVE_OSF_SIA */ |
1519 | } | |
1520 | ||
996d5e62 | 1521 | #ifdef USE_PAM |
dec6d9fe | 1522 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1523 | debug3("PAM session not opened, exiting"); | |
996d5e62 | 1524 | display_loginmsg(); |
1525 | exit(254); | |
1526 | } | |
1527 | #endif | |
1528 | ||
e9a17296 | 1529 | /* |
1530 | * Get the shell from the password data. An empty shell field is | |
1531 | * legal, and means /bin/sh. | |
1532 | */ | |
1533 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
6a9b3198 | 1534 | |
1535 | /* | |
1536 | * Make sure $SHELL points to the shell from the password file, | |
1537 | * even if shell is overridden from login.conf | |
1538 | */ | |
1539 | env = do_setup_env(s, shell); | |
1540 | ||
e9a17296 | 1541 | #ifdef HAVE_LOGIN_CAP |
1542 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1543 | #endif | |
1544 | ||
3c0ef626 | 1545 | /* we have to stash the hostname before we close our socket. */ |
1546 | if (options.use_login) | |
1547 | hostname = get_remote_name_or_ip(utmp_len, | |
0fff78ff | 1548 | options.use_dns); |
3c0ef626 | 1549 | /* |
1550 | * Close the connection descriptors; note that this is the child, and | |
1551 | * the server will still have the socket open, and it is important | |
1552 | * that we do not shutdown it. Note that the descriptors cannot be | |
1553 | * closed before building the environment, as we call | |
1554 | * get_remote_ipaddr there. | |
1555 | */ | |
cdd66111 | 1556 | child_close_fds(); |
3c0ef626 | 1557 | |
1558 | /* | |
cdd66111 | 1559 | * Must take new environment into use so that .ssh/rc, |
1560 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
3c0ef626 | 1561 | */ |
cdd66111 | 1562 | environ = env; |
3c0ef626 | 1563 | |
cdd66111 | 1564 | #if defined(KRB5) && defined(USE_AFS) |
3c0ef626 | 1565 | /* |
cdd66111 | 1566 | * At this point, we check to see if AFS is active and if we have |
1567 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1568 | * if we can (and need to) extend the ticket into an AFS token. If | |
1569 | * we don't do this, we run into potential problems if the user's | |
1570 | * home directory is in AFS and it's not world-readable. | |
3c0ef626 | 1571 | */ |
3c0ef626 | 1572 | |
cdd66111 | 1573 | if (options.kerberos_get_afs_token && k_hasafs() && |
665a873d | 1574 | (s->authctxt->krb5_ctx != NULL)) { |
cdd66111 | 1575 | char cell[64]; |
1576 | ||
1577 | debug("Getting AFS token"); | |
1578 | ||
1579 | k_setpag(); | |
1580 | ||
1581 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1582 | krb5_afslog(s->authctxt->krb5_ctx, | |
1583 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1584 | ||
1585 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1586 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1587 | } | |
1588 | #endif | |
3c0ef626 | 1589 | |
2c06c99b | 1590 | /* Change current directory to the user's home directory. */ |
3c0ef626 | 1591 | if (chdir(pw->pw_dir) < 0) { |
1592 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1593 | pw->pw_dir, strerror(errno)); | |
1594 | #ifdef HAVE_LOGIN_CAP | |
1595 | if (login_getcapbool(lc, "requirehome", 0)) | |
1596 | exit(1); | |
1597 | #endif | |
1598 | } | |
1599 | ||
e9a17296 | 1600 | if (!options.use_login) |
1601 | do_rc_files(s, shell); | |
3c0ef626 | 1602 | |
1603 | /* restore SIGPIPE for child */ | |
9108f8d9 | 1604 | signal(SIGPIPE, SIG_DFL); |
3c0ef626 | 1605 | |
e9a17296 | 1606 | if (options.use_login) { |
700318f3 | 1607 | launch_login(pw, hostname); |
1608 | /* NEVERREACHED */ | |
e9a17296 | 1609 | } |
1610 | ||
1611 | /* Get the last component of the shell name. */ | |
1612 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1613 | shell0++; | |
1614 | else | |
1615 | shell0 = shell; | |
1616 | ||
3c0ef626 | 1617 | /* |
1618 | * If we have no command, execute the shell. In this case, the shell | |
1619 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1620 | * this is a login shell. | |
1621 | */ | |
1622 | if (!command) { | |
e9a17296 | 1623 | char argv0[256]; |
3c0ef626 | 1624 | |
e9a17296 | 1625 | /* Start the shell. Set initial character to '-'. */ |
1626 | argv0[0] = '-'; | |
3c0ef626 | 1627 | |
e9a17296 | 1628 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1629 | >= sizeof(argv0) - 1) { | |
1630 | errno = EINVAL; | |
3c0ef626 | 1631 | perror(shell); |
1632 | exit(1); | |
e9a17296 | 1633 | } |
3c0ef626 | 1634 | |
e9a17296 | 1635 | /* Execute the shell. */ |
1636 | argv[0] = argv0; | |
1637 | argv[1] = NULL; | |
1638 | execve(shell, argv, env); | |
3c0ef626 | 1639 | |
e9a17296 | 1640 | /* Executing the shell failed. */ |
1641 | perror(shell); | |
1642 | exit(1); | |
3c0ef626 | 1643 | } |
1644 | /* | |
1645 | * Execute the command using the user's shell. This uses the -c | |
1646 | * option to execute the command. | |
1647 | */ | |
e9a17296 | 1648 | argv[0] = (char *) shell0; |
3c0ef626 | 1649 | argv[1] = "-c"; |
1650 | argv[2] = (char *) command; | |
1651 | argv[3] = NULL; | |
1652 | execve(shell, argv, env); | |
1653 | perror(shell); | |
1654 | exit(1); | |
1655 | } | |
1656 | ||
1657 | Session * | |
1658 | session_new(void) | |
1659 | { | |
1660 | int i; | |
1661 | static int did_init = 0; | |
1662 | if (!did_init) { | |
1663 | debug("session_new: init"); | |
e9a17296 | 1664 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1665 | sessions[i].used = 0; |
1666 | } | |
1667 | did_init = 1; | |
1668 | } | |
e9a17296 | 1669 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1670 | Session *s = &sessions[i]; |
1671 | if (! s->used) { | |
1672 | memset(s, 0, sizeof(*s)); | |
1673 | s->chanid = -1; | |
1674 | s->ptyfd = -1; | |
1675 | s->ttyfd = -1; | |
1676 | s->used = 1; | |
1677 | s->self = i; | |
665a873d | 1678 | s->x11_chanids = NULL; |
3c0ef626 | 1679 | debug("session_new: session %d", i); |
1680 | return s; | |
1681 | } | |
1682 | } | |
1683 | return NULL; | |
1684 | } | |
1685 | ||
1686 | static void | |
1687 | session_dump(void) | |
1688 | { | |
1689 | int i; | |
e9a17296 | 1690 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1691 | Session *s = &sessions[i]; |
f5799ae1 | 1692 | debug("dump: used %d session %d %p channel %d pid %ld", |
3c0ef626 | 1693 | s->used, |
1694 | s->self, | |
1695 | s, | |
1696 | s->chanid, | |
f5799ae1 | 1697 | (long)s->pid); |
3c0ef626 | 1698 | } |
1699 | } | |
1700 | ||
1701 | int | |
1702 | session_open(Authctxt *authctxt, int chanid) | |
1703 | { | |
1704 | Session *s = session_new(); | |
1705 | debug("session_open: channel %d", chanid); | |
1706 | if (s == NULL) { | |
1707 | error("no more sessions"); | |
1708 | return 0; | |
1709 | } | |
1710 | s->authctxt = authctxt; | |
1711 | s->pw = authctxt->pw; | |
cdd66111 | 1712 | if (s->pw == NULL || !authctxt->valid) |
3c0ef626 | 1713 | fatal("no user for session %d", s->self); |
1714 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1715 | s->chanid = chanid; | |
1716 | return 1; | |
1717 | } | |
1718 | ||
700318f3 | 1719 | Session * |
1720 | session_by_tty(char *tty) | |
1721 | { | |
1722 | int i; | |
1723 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1724 | Session *s = &sessions[i]; | |
1725 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1726 | debug("session_by_tty: session %d tty %s", i, tty); | |
1727 | return s; | |
1728 | } | |
1729 | } | |
1730 | debug("session_by_tty: unknown tty %.100s", tty); | |
1731 | session_dump(); | |
1732 | return NULL; | |
1733 | } | |
1734 | ||
3c0ef626 | 1735 | static Session * |
1736 | session_by_channel(int id) | |
1737 | { | |
1738 | int i; | |
e9a17296 | 1739 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1740 | Session *s = &sessions[i]; |
1741 | if (s->used && s->chanid == id) { | |
1742 | debug("session_by_channel: session %d channel %d", i, id); | |
1743 | return s; | |
1744 | } | |
1745 | } | |
1746 | debug("session_by_channel: unknown channel %d", id); | |
1747 | session_dump(); | |
1748 | return NULL; | |
1749 | } | |
1750 | ||
665a873d | 1751 | static Session * |
1752 | session_by_x11_channel(int id) | |
1753 | { | |
1754 | int i, j; | |
1755 | ||
1756 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1757 | Session *s = &sessions[i]; | |
1758 | ||
1759 | if (s->x11_chanids == NULL || !s->used) | |
1760 | continue; | |
1761 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
1762 | if (s->x11_chanids[j] == id) { | |
1763 | debug("session_by_x11_channel: session %d " | |
1764 | "channel %d", s->self, id); | |
1765 | return s; | |
1766 | } | |
1767 | } | |
1768 | } | |
1769 | debug("session_by_x11_channel: unknown channel %d", id); | |
1770 | session_dump(); | |
1771 | return NULL; | |
1772 | } | |
1773 | ||
3c0ef626 | 1774 | static Session * |
1775 | session_by_pid(pid_t pid) | |
1776 | { | |
1777 | int i; | |
f5799ae1 | 1778 | debug("session_by_pid: pid %ld", (long)pid); |
e9a17296 | 1779 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1780 | Session *s = &sessions[i]; |
1781 | if (s->used && s->pid == pid) | |
1782 | return s; | |
1783 | } | |
f5799ae1 | 1784 | error("session_by_pid: unknown pid %ld", (long)pid); |
3c0ef626 | 1785 | session_dump(); |
1786 | return NULL; | |
1787 | } | |
1788 | ||
1789 | static int | |
1790 | session_window_change_req(Session *s) | |
1791 | { | |
1792 | s->col = packet_get_int(); | |
1793 | s->row = packet_get_int(); | |
1794 | s->xpixel = packet_get_int(); | |
1795 | s->ypixel = packet_get_int(); | |
e9a17296 | 1796 | packet_check_eom(); |
3c0ef626 | 1797 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1798 | return 1; | |
1799 | } | |
1800 | ||
1801 | static int | |
1802 | session_pty_req(Session *s) | |
1803 | { | |
1804 | u_int len; | |
1805 | int n_bytes; | |
1806 | ||
1807 | if (no_pty_flag) { | |
1808 | debug("Allocating a pty not permitted for this authentication."); | |
1809 | return 0; | |
1810 | } | |
1811 | if (s->ttyfd != -1) { | |
1812 | packet_disconnect("Protocol error: you already have a pty."); | |
1813 | return 0; | |
1814 | } | |
1815 | ||
1816 | s->term = packet_get_string(&len); | |
1817 | ||
1818 | if (compat20) { | |
1819 | s->col = packet_get_int(); | |
1820 | s->row = packet_get_int(); | |
1821 | } else { | |
1822 | s->row = packet_get_int(); | |
1823 | s->col = packet_get_int(); | |
1824 | } | |
1825 | s->xpixel = packet_get_int(); | |
1826 | s->ypixel = packet_get_int(); | |
1827 | ||
1828 | if (strcmp(s->term, "") == 0) { | |
1829 | xfree(s->term); | |
1830 | s->term = NULL; | |
1831 | } | |
1832 | ||
1833 | /* Allocate a pty and open it. */ | |
1834 | debug("Allocating pty."); | |
700318f3 | 1835 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
3c0ef626 | 1836 | if (s->term) |
1837 | xfree(s->term); | |
1838 | s->term = NULL; | |
1839 | s->ptyfd = -1; | |
1840 | s->ttyfd = -1; | |
1841 | error("session_pty_req: session %d alloc failed", s->self); | |
1842 | return 0; | |
1843 | } | |
1844 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
1845 | ||
1846 | /* for SSH1 the tty modes length is not given */ | |
1847 | if (!compat20) | |
1848 | n_bytes = packet_remaining(); | |
1849 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1850 | ||
700318f3 | 1851 | if (!use_privsep) |
1852 | pty_setowner(s->pw, s->tty); | |
3c0ef626 | 1853 | |
1854 | /* Set window size from the packet. */ | |
1855 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
1856 | ||
e9a17296 | 1857 | packet_check_eom(); |
3c0ef626 | 1858 | session_proctitle(s); |
1859 | return 1; | |
1860 | } | |
1861 | ||
1862 | static int | |
1863 | session_subsystem_req(Session *s) | |
1864 | { | |
1865 | struct stat st; | |
1866 | u_int len; | |
1867 | int success = 0; | |
9108f8d9 | 1868 | char *prog, *cmd, *subsys = packet_get_string(&len); |
665a873d | 1869 | u_int i; |
3c0ef626 | 1870 | |
e9a17296 | 1871 | packet_check_eom(); |
0fff78ff | 1872 | logit("subsystem request for %.100s", subsys); |
3c0ef626 | 1873 | |
1874 | for (i = 0; i < options.num_subsystems; i++) { | |
1875 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { | |
9108f8d9 | 1876 | prog = options.subsystem_command[i]; |
1877 | cmd = options.subsystem_args[i]; | |
1878 | if (stat(prog, &st) < 0) { | |
1879 | error("subsystem: cannot stat %s: %s", prog, | |
3c0ef626 | 1880 | strerror(errno)); |
1881 | break; | |
1882 | } | |
1883 | debug("subsystem: exec() %s", cmd); | |
1884 | s->is_subsystem = 1; | |
1885 | do_exec(s, cmd); | |
1886 | success = 1; | |
e9a17296 | 1887 | break; |
3c0ef626 | 1888 | } |
1889 | } | |
1890 | ||
1891 | if (!success) | |
0fff78ff | 1892 | logit("subsystem request for %.100s failed, subsystem not found", |
3c0ef626 | 1893 | subsys); |
1894 | ||
1895 | xfree(subsys); | |
1896 | return success; | |
1897 | } | |
1898 | ||
1899 | static int | |
1900 | session_x11_req(Session *s) | |
1901 | { | |
1902 | int success; | |
1903 | ||
665a873d | 1904 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
1905 | error("session_x11_req: session %d: " | |
2c06c99b | 1906 | "x11 forwarding already active", s->self); |
665a873d | 1907 | return 0; |
1908 | } | |
3c0ef626 | 1909 | s->single_connection = packet_get_char(); |
1910 | s->auth_proto = packet_get_string(NULL); | |
1911 | s->auth_data = packet_get_string(NULL); | |
1912 | s->screen = packet_get_int(); | |
e9a17296 | 1913 | packet_check_eom(); |
3c0ef626 | 1914 | |
1915 | success = session_setup_x11fwd(s); | |
1916 | if (!success) { | |
1917 | xfree(s->auth_proto); | |
1918 | xfree(s->auth_data); | |
1919 | s->auth_proto = NULL; | |
1920 | s->auth_data = NULL; | |
1921 | } | |
1922 | return success; | |
1923 | } | |
1924 | ||
1925 | static int | |
1926 | session_shell_req(Session *s) | |
1927 | { | |
e9a17296 | 1928 | packet_check_eom(); |
3c0ef626 | 1929 | do_exec(s, NULL); |
1930 | return 1; | |
1931 | } | |
1932 | ||
1933 | static int | |
1934 | session_exec_req(Session *s) | |
1935 | { | |
1936 | u_int len; | |
1937 | char *command = packet_get_string(&len); | |
e9a17296 | 1938 | packet_check_eom(); |
3c0ef626 | 1939 | do_exec(s, command); |
1940 | xfree(command); | |
1941 | return 1; | |
1942 | } | |
1943 | ||
0fff78ff | 1944 | static int |
1945 | session_break_req(Session *s) | |
1946 | { | |
0fff78ff | 1947 | |
c9f39d2c | 1948 | packet_get_int(); /* ignored */ |
0fff78ff | 1949 | packet_check_eom(); |
1950 | ||
1951 | if (s->ttyfd == -1 || | |
1952 | tcsendbreak(s->ttyfd, 0) < 0) | |
1953 | return 0; | |
1954 | return 1; | |
1955 | } | |
1956 | ||
c9f39d2c | 1957 | static int |
1958 | session_env_req(Session *s) | |
1959 | { | |
1960 | char *name, *val; | |
1961 | u_int name_len, val_len, i; | |
1962 | ||
1963 | name = packet_get_string(&name_len); | |
1964 | val = packet_get_string(&val_len); | |
1965 | packet_check_eom(); | |
1966 | ||
1967 | /* Don't set too many environment variables */ | |
1968 | if (s->num_env > 128) { | |
1969 | debug2("Ignoring env request %s: too many env vars", name); | |
1970 | goto fail; | |
1971 | } | |
1972 | ||
1973 | for (i = 0; i < options.num_accept_env; i++) { | |
1974 | if (match_pattern(name, options.accept_env[i])) { | |
1975 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
9108f8d9 | 1976 | s->env = xrealloc(s->env, s->num_env + 1, |
1977 | sizeof(*s->env)); | |
c9f39d2c | 1978 | s->env[s->num_env].name = name; |
1979 | s->env[s->num_env].val = val; | |
1980 | s->num_env++; | |
1981 | return (1); | |
1982 | } | |
1983 | } | |
1984 | debug2("Ignoring env request %s: disallowed name", name); | |
1985 | ||
1986 | fail: | |
1987 | xfree(name); | |
1988 | xfree(val); | |
1989 | return (0); | |
1990 | } | |
1991 | ||
3c0ef626 | 1992 | static int |
1993 | session_auth_agent_req(Session *s) | |
1994 | { | |
1995 | static int called = 0; | |
e9a17296 | 1996 | packet_check_eom(); |
3c0ef626 | 1997 | if (no_agent_forwarding_flag) { |
1998 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1999 | return 0; | |
2000 | } | |
2001 | if (called) { | |
2002 | return 0; | |
2003 | } else { | |
2004 | called = 1; | |
2005 | return auth_input_request_forwarding(s->pw); | |
2006 | } | |
2007 | } | |
2008 | ||
e9a17296 | 2009 | int |
2010 | session_input_channel_req(Channel *c, const char *rtype) | |
3c0ef626 | 2011 | { |
3c0ef626 | 2012 | int success = 0; |
3c0ef626 | 2013 | Session *s; |
3c0ef626 | 2014 | |
e9a17296 | 2015 | if ((s = session_by_channel(c->self)) == NULL) { |
0fff78ff | 2016 | logit("session_input_channel_req: no session %d req %.100s", |
e9a17296 | 2017 | c->self, rtype); |
2018 | return 0; | |
2019 | } | |
2020 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
3c0ef626 | 2021 | |
2022 | /* | |
2023 | * a session is in LARVAL state until a shell, a command | |
2024 | * or a subsystem is executed | |
2025 | */ | |
2026 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2027 | if (strcmp(rtype, "shell") == 0) { | |
2028 | success = session_shell_req(s); | |
2029 | } else if (strcmp(rtype, "exec") == 0) { | |
2030 | success = session_exec_req(s); | |
2031 | } else if (strcmp(rtype, "pty-req") == 0) { | |
2032 | success = session_pty_req(s); | |
2033 | } else if (strcmp(rtype, "x11-req") == 0) { | |
2034 | success = session_x11_req(s); | |
2035 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { | |
2036 | success = session_auth_agent_req(s); | |
2037 | } else if (strcmp(rtype, "subsystem") == 0) { | |
2038 | success = session_subsystem_req(s); | |
c9f39d2c | 2039 | } else if (strcmp(rtype, "env") == 0) { |
2040 | success = session_env_req(s); | |
3c0ef626 | 2041 | } |
2042 | } | |
2043 | if (strcmp(rtype, "window-change") == 0) { | |
2044 | success = session_window_change_req(s); | |
c9f39d2c | 2045 | } else if (strcmp(rtype, "break") == 0) { |
2046 | success = session_break_req(s); | |
3c0ef626 | 2047 | } |
c9f39d2c | 2048 | |
e9a17296 | 2049 | return success; |
3c0ef626 | 2050 | } |
2051 | ||
2052 | void | |
2053 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2054 | { | |
2055 | if (!compat20) | |
2056 | fatal("session_set_fds: called for proto != 2.0"); | |
2057 | /* | |
2058 | * now that have a child and a pipe to the child, | |
2059 | * we can activate our channel and register the fd's | |
2060 | */ | |
2061 | if (s->chanid == -1) | |
2062 | fatal("no channel for session %d", s->self); | |
d6f3ca1e | 2063 | if(options.hpn_disabled) |
2064 | channel_set_fds(s->chanid, | |
2065 | fdout, fdin, fderr, | |
2066 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
2067 | 1, | |
2068 | CHAN_SES_WINDOW_DEFAULT); | |
2069 | else | |
2070 | channel_set_fds(s->chanid, | |
2071 | fdout, fdin, fderr, | |
2072 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
2073 | 1, | |
2074 | options.hpn_buffer_size); | |
3c0ef626 | 2075 | } |
2076 | ||
2077 | /* | |
2078 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2079 | * (e.g., due to a dropped connection). | |
2080 | */ | |
700318f3 | 2081 | void |
cdd66111 | 2082 | session_pty_cleanup2(Session *s) |
3c0ef626 | 2083 | { |
3c0ef626 | 2084 | if (s == NULL) { |
2085 | error("session_pty_cleanup: no session"); | |
2086 | return; | |
2087 | } | |
2088 | if (s->ttyfd == -1) | |
2089 | return; | |
2090 | ||
2091 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); | |
2092 | ||
2093 | /* Record that the user has logged out. */ | |
2094 | if (s->pid != 0) | |
e9a17296 | 2095 | record_logout(s->pid, s->tty, s->pw->pw_name); |
3c0ef626 | 2096 | |
2097 | /* Release the pseudo-tty. */ | |
700318f3 | 2098 | if (getuid() == 0) |
2099 | pty_release(s->tty); | |
3c0ef626 | 2100 | |
2101 | /* | |
2102 | * Close the server side of the socket pairs. We must do this after | |
2103 | * the pty cleanup, so that another process doesn't get this pty | |
2104 | * while we're still cleaning up. | |
2105 | */ | |
2106 | if (close(s->ptymaster) < 0) | |
700318f3 | 2107 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
3c0ef626 | 2108 | |
2109 | /* unlink pty from session */ | |
2110 | s->ttyfd = -1; | |
2111 | } | |
2112 | ||
700318f3 | 2113 | void |
cdd66111 | 2114 | session_pty_cleanup(Session *s) |
700318f3 | 2115 | { |
cdd66111 | 2116 | PRIVSEP(session_pty_cleanup2(s)); |
700318f3 | 2117 | } |
2118 | ||
41b2f314 | 2119 | static char * |
2120 | sig2name(int sig) | |
2121 | { | |
2122 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2123 | SSH_SIG(ABRT); | |
2124 | SSH_SIG(ALRM); | |
2125 | SSH_SIG(FPE); | |
2126 | SSH_SIG(HUP); | |
2127 | SSH_SIG(ILL); | |
2128 | SSH_SIG(INT); | |
2129 | SSH_SIG(KILL); | |
2130 | SSH_SIG(PIPE); | |
2131 | SSH_SIG(QUIT); | |
2132 | SSH_SIG(SEGV); | |
2133 | SSH_SIG(TERM); | |
2134 | SSH_SIG(USR1); | |
2135 | SSH_SIG(USR2); | |
2136 | #undef SSH_SIG | |
2137 | return "SIG@openssh.com"; | |
2138 | } | |
2139 | ||
665a873d | 2140 | static void |
2141 | session_close_x11(int id) | |
2142 | { | |
2143 | Channel *c; | |
2144 | ||
2c06c99b | 2145 | if ((c = channel_by_id(id)) == NULL) { |
665a873d | 2146 | debug("session_close_x11: x11 channel %d missing", id); |
2147 | } else { | |
2148 | /* Detach X11 listener */ | |
2149 | debug("session_close_x11: detach x11 channel %d", id); | |
2150 | channel_cancel_cleanup(id); | |
2151 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2152 | chan_mark_dead(c); | |
2153 | } | |
2154 | } | |
2155 | ||
2156 | static void | |
2157 | session_close_single_x11(int id, void *arg) | |
2158 | { | |
2159 | Session *s; | |
2160 | u_int i; | |
2161 | ||
2162 | debug3("session_close_single_x11: channel %d", id); | |
2163 | channel_cancel_cleanup(id); | |
2164 | if ((s = session_by_x11_channel(id)) == NULL) | |
2165 | fatal("session_close_single_x11: no x11 channel %d", id); | |
2166 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2167 | debug("session_close_single_x11: session %d: " | |
2168 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2169 | /* | |
2170 | * The channel "id" is already closing, but make sure we | |
2171 | * close all of its siblings. | |
2172 | */ | |
2173 | if (s->x11_chanids[i] != id) | |
2174 | session_close_x11(s->x11_chanids[i]); | |
2175 | } | |
2176 | xfree(s->x11_chanids); | |
2177 | s->x11_chanids = NULL; | |
2178 | if (s->display) { | |
2179 | xfree(s->display); | |
2180 | s->display = NULL; | |
2181 | } | |
2182 | if (s->auth_proto) { | |
2183 | xfree(s->auth_proto); | |
2184 | s->auth_proto = NULL; | |
2185 | } | |
2186 | if (s->auth_data) { | |
2187 | xfree(s->auth_data); | |
2188 | s->auth_data = NULL; | |
2189 | } | |
2190 | if (s->auth_display) { | |
2191 | xfree(s->auth_display); | |
2192 | s->auth_display = NULL; | |
2193 | } | |
2194 | } | |
2195 | ||
3c0ef626 | 2196 | static void |
2197 | session_exit_message(Session *s, int status) | |
2198 | { | |
2199 | Channel *c; | |
e9a17296 | 2200 | |
2201 | if ((c = channel_lookup(s->chanid)) == NULL) | |
3c0ef626 | 2202 | fatal("session_exit_message: session %d: no channel %d", |
2203 | s->self, s->chanid); | |
f5799ae1 | 2204 | debug("session_exit_message: session %d channel %d pid %ld", |
2205 | s->self, s->chanid, (long)s->pid); | |
3c0ef626 | 2206 | |
2207 | if (WIFEXITED(status)) { | |
e9a17296 | 2208 | channel_request_start(s->chanid, "exit-status", 0); |
3c0ef626 | 2209 | packet_put_int(WEXITSTATUS(status)); |
2210 | packet_send(); | |
2211 | } else if (WIFSIGNALED(status)) { | |
e9a17296 | 2212 | channel_request_start(s->chanid, "exit-signal", 0); |
41b2f314 | 2213 | packet_put_cstring(sig2name(WTERMSIG(status))); |
3c0ef626 | 2214 | #ifdef WCOREDUMP |
2215 | packet_put_char(WCOREDUMP(status)); | |
2216 | #else /* WCOREDUMP */ | |
2217 | packet_put_char(0); | |
2218 | #endif /* WCOREDUMP */ | |
2219 | packet_put_cstring(""); | |
2220 | packet_put_cstring(""); | |
2221 | packet_send(); | |
2222 | } else { | |
2223 | /* Some weird exit cause. Just exit. */ | |
2224 | packet_disconnect("wait returned status %04x.", status); | |
2225 | } | |
2226 | ||
2227 | /* disconnect channel */ | |
2228 | debug("session_exit_message: release channel %d", s->chanid); | |
2c06c99b | 2229 | |
2230 | /* | |
2231 | * Adjust cleanup callback attachment to send close messages when | |
9108f8d9 | 2232 | * the channel gets EOF. The session will be then be closed |
2c06c99b | 2233 | * by session_close_by_channel when the childs close their fds. |
2234 | */ | |
2235 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2236 | ||
3c0ef626 | 2237 | /* |
2238 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2239 | * interested in data we write. | |
2240 | * Note that we must not call 'chan_read_failed', since there could | |
2241 | * be some more data waiting in the pipe. | |
2242 | */ | |
2243 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2244 | chan_write_failed(c); | |
3c0ef626 | 2245 | } |
2246 | ||
700318f3 | 2247 | void |
3c0ef626 | 2248 | session_close(Session *s) |
2249 | { | |
665a873d | 2250 | u_int i; |
c9f39d2c | 2251 | |
f5799ae1 | 2252 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
cdd66111 | 2253 | if (s->ttyfd != -1) |
3c0ef626 | 2254 | session_pty_cleanup(s); |
3c0ef626 | 2255 | if (s->term) |
2256 | xfree(s->term); | |
2257 | if (s->display) | |
2258 | xfree(s->display); | |
665a873d | 2259 | if (s->x11_chanids) |
2260 | xfree(s->x11_chanids); | |
e9a17296 | 2261 | if (s->auth_display) |
2262 | xfree(s->auth_display); | |
3c0ef626 | 2263 | if (s->auth_data) |
2264 | xfree(s->auth_data); | |
2265 | if (s->auth_proto) | |
2266 | xfree(s->auth_proto); | |
2267 | s->used = 0; | |
9108f8d9 | 2268 | if (s->env != NULL) { |
2269 | for (i = 0; i < s->num_env; i++) { | |
2270 | xfree(s->env[i].name); | |
2271 | xfree(s->env[i].val); | |
2272 | } | |
c9f39d2c | 2273 | xfree(s->env); |
9108f8d9 | 2274 | } |
3c0ef626 | 2275 | session_proctitle(s); |
2276 | } | |
2277 | ||
2278 | void | |
2279 | session_close_by_pid(pid_t pid, int status) | |
2280 | { | |
2281 | Session *s = session_by_pid(pid); | |
2282 | if (s == NULL) { | |
f5799ae1 | 2283 | debug("session_close_by_pid: no session for pid %ld", |
2284 | (long)pid); | |
3c0ef626 | 2285 | return; |
2286 | } | |
2287 | if (s->chanid != -1) | |
2288 | session_exit_message(s, status); | |
2c06c99b | 2289 | if (s->ttyfd != -1) |
2290 | session_pty_cleanup(s); | |
f2f068fa | 2291 | s->pid = 0; |
3c0ef626 | 2292 | } |
2293 | ||
2294 | /* | |
2295 | * this is called when a channel dies before | |
2296 | * the session 'child' itself dies | |
2297 | */ | |
2298 | void | |
2299 | session_close_by_channel(int id, void *arg) | |
2300 | { | |
2301 | Session *s = session_by_channel(id); | |
2c06c99b | 2302 | u_int i; |
665a873d | 2303 | |
3c0ef626 | 2304 | if (s == NULL) { |
2305 | debug("session_close_by_channel: no session for id %d", id); | |
2306 | return; | |
2307 | } | |
f5799ae1 | 2308 | debug("session_close_by_channel: channel %d child %ld", |
2309 | id, (long)s->pid); | |
3c0ef626 | 2310 | if (s->pid != 0) { |
2311 | debug("session_close_by_channel: channel %d: has child", id); | |
2312 | /* | |
2313 | * delay detach of session, but release pty, since | |
2314 | * the fd's to the child are already closed | |
2315 | */ | |
cdd66111 | 2316 | if (s->ttyfd != -1) |
3c0ef626 | 2317 | session_pty_cleanup(s); |
3c0ef626 | 2318 | return; |
2319 | } | |
2320 | /* detach by removing callback */ | |
2321 | channel_cancel_cleanup(s->chanid); | |
2c06c99b | 2322 | |
2323 | /* Close any X11 listeners associated with this session */ | |
2324 | if (s->x11_chanids != NULL) { | |
2325 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2326 | session_close_x11(s->x11_chanids[i]); | |
2327 | s->x11_chanids[i] = -1; | |
2328 | } | |
2329 | } | |
2330 | ||
3c0ef626 | 2331 | s->chanid = -1; |
2332 | session_close(s); | |
2333 | } | |
2334 | ||
2335 | void | |
700318f3 | 2336 | session_destroy_all(void (*closefunc)(Session *)) |
3c0ef626 | 2337 | { |
2338 | int i; | |
e9a17296 | 2339 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2340 | Session *s = &sessions[i]; |
700318f3 | 2341 | if (s->used) { |
2342 | if (closefunc != NULL) | |
2343 | closefunc(s); | |
2344 | else | |
2345 | session_close(s); | |
2346 | } | |
3c0ef626 | 2347 | } |
2348 | } | |
2349 | ||
2350 | static char * | |
2351 | session_tty_list(void) | |
2352 | { | |
2353 | static char buf[1024]; | |
2354 | int i; | |
6a9b3198 | 2355 | char *cp; |
2356 | ||
3c0ef626 | 2357 | buf[0] = '\0'; |
e9a17296 | 2358 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2359 | Session *s = &sessions[i]; |
2360 | if (s->used && s->ttyfd != -1) { | |
cdd66111 | 2361 | |
6a9b3198 | 2362 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2363 | cp = strrchr(s->tty, '/'); | |
2364 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2365 | } else | |
2366 | cp = s->tty + 5; | |
cdd66111 | 2367 | |
3c0ef626 | 2368 | if (buf[0] != '\0') |
2369 | strlcat(buf, ",", sizeof buf); | |
6a9b3198 | 2370 | strlcat(buf, cp, sizeof buf); |
3c0ef626 | 2371 | } |
2372 | } | |
2373 | if (buf[0] == '\0') | |
2374 | strlcpy(buf, "notty", sizeof buf); | |
2375 | return buf; | |
2376 | } | |
2377 | ||
2378 | void | |
2379 | session_proctitle(Session *s) | |
2380 | { | |
2381 | if (s->pw == NULL) | |
2382 | error("no user for session %d", s->self); | |
2383 | else | |
2384 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2385 | } | |
2386 | ||
2387 | int | |
2388 | session_setup_x11fwd(Session *s) | |
2389 | { | |
2390 | struct stat st; | |
e9a17296 | 2391 | char display[512], auth_display[512]; |
2392 | char hostname[MAXHOSTNAMELEN]; | |
665a873d | 2393 | u_int i; |
3c0ef626 | 2394 | |
2395 | if (no_x11_forwarding_flag) { | |
2396 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2397 | return 0; | |
2398 | } | |
2399 | if (!options.x11_forwarding) { | |
2400 | debug("X11 forwarding disabled in server configuration file."); | |
2401 | return 0; | |
2402 | } | |
2403 | if (!options.xauth_location || | |
2404 | (stat(options.xauth_location, &st) == -1)) { | |
2405 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2406 | return 0; | |
2407 | } | |
2408 | if (options.use_login) { | |
2409 | packet_send_debug("X11 forwarding disabled; " | |
2410 | "not compatible with UseLogin=yes."); | |
2411 | return 0; | |
2412 | } | |
2413 | if (s->display != NULL) { | |
2414 | debug("X11 display already set."); | |
2415 | return 0; | |
2416 | } | |
680cee3b | 2417 | if (x11_create_display_inet(options.x11_display_offset, |
2418 | options.x11_use_localhost, s->single_connection, | |
d6f3ca1e | 2419 | &s->display_number, &s->x11_chanids, |
2420 | options.hpn_disabled, options.hpn_buffer_size) == -1) { | |
3c0ef626 | 2421 | debug("x11_create_display_inet failed."); |
2422 | return 0; | |
2423 | } | |
665a873d | 2424 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2425 | channel_register_cleanup(s->x11_chanids[i], | |
2c06c99b | 2426 | session_close_single_x11, 0); |
665a873d | 2427 | } |
e9a17296 | 2428 | |
2429 | /* Set up a suitable value for the DISPLAY variable. */ | |
2430 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2431 | fatal("gethostname: %.100s", strerror(errno)); | |
2432 | /* | |
2433 | * auth_display must be used as the displayname when the | |
2434 | * authorization entry is added with xauth(1). This will be | |
2435 | * different than the DISPLAY string for localhost displays. | |
2436 | */ | |
2437 | if (options.x11_use_localhost) { | |
680cee3b | 2438 | snprintf(display, sizeof display, "localhost:%u.%u", |
e9a17296 | 2439 | s->display_number, s->screen); |
680cee3b | 2440 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
e9a17296 | 2441 | s->display_number, s->screen); |
2442 | s->display = xstrdup(display); | |
2443 | s->auth_display = xstrdup(auth_display); | |
2444 | } else { | |
2445 | #ifdef IPADDR_IN_DISPLAY | |
2446 | struct hostent *he; | |
2447 | struct in_addr my_addr; | |
2448 | ||
2449 | he = gethostbyname(hostname); | |
2450 | if (he == NULL) { | |
2451 | error("Can't get IP address for X11 DISPLAY."); | |
2452 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2453 | return 0; | |
2454 | } | |
2455 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
680cee3b | 2456 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
e9a17296 | 2457 | s->display_number, s->screen); |
2458 | #else | |
680cee3b | 2459 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
e9a17296 | 2460 | s->display_number, s->screen); |
2461 | #endif | |
2462 | s->display = xstrdup(display); | |
2463 | s->auth_display = xstrdup(display); | |
2464 | } | |
2465 | ||
3c0ef626 | 2466 | return 1; |
2467 | } | |
2468 | ||
2469 | static void | |
2470 | do_authenticated2(Authctxt *authctxt) | |
2471 | { | |
2472 | server_loop2(authctxt); | |
cdd66111 | 2473 | } |
2474 | ||
2475 | void | |
2476 | do_cleanup(Authctxt *authctxt) | |
2477 | { | |
2478 | static int called = 0; | |
2479 | ||
2480 | debug("do_cleanup"); | |
2481 | ||
2482 | /* no cleanup if we're in the child for login shell */ | |
2483 | if (is_child) | |
2484 | return; | |
2485 | ||
2486 | /* avoid double cleanup */ | |
2487 | if (called) | |
2488 | return; | |
2489 | called = 1; | |
2490 | ||
9108f8d9 | 2491 | if (authctxt == NULL || !authctxt->authenticated) |
cdd66111 | 2492 | return; |
2493 | #ifdef KRB5 | |
2494 | if (options.kerberos_ticket_cleanup && | |
2495 | authctxt->krb5_ctx) | |
2496 | krb5_cleanup_proc(authctxt); | |
0fff78ff | 2497 | #endif |
cdd66111 | 2498 | |
2499 | #ifdef GSSAPI | |
2500 | if (compat20 && options.gss_cleanup_creds) | |
2501 | ssh_gssapi_cleanup_creds(); | |
2502 | #endif | |
2503 | ||
2504 | #ifdef USE_PAM | |
2505 | if (options.use_pam) { | |
2506 | sshpam_cleanup(); | |
2507 | sshpam_thread_cleanup(); | |
2508 | } | |
2509 | #endif | |
2510 | ||
2511 | /* remove agent socket */ | |
2512 | auth_sock_cleanup_proc(authctxt->pw); | |
2513 | ||
2514 | /* | |
2515 | * Cleanup ptys/utmp only if privsep is disabled, | |
2516 | * or if running in monitor. | |
2517 | */ | |
2518 | if (!use_privsep || mm_is_monitor()) | |
2519 | session_destroy_all(session_pty_cleanup2); | |
3c0ef626 | 2520 | } |