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e74dc197 | 1 | /* $OpenBSD: session.c,v 1.233 2008/03/26 21:28:14 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 | |
30460aeb | 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" | |
7e82606e | 69 | #include "match.h" |
3c0ef626 | 70 | #include "uidswap.h" |
71 | #include "compat.h" | |
72 | #include "channels.h" | |
30460aeb | 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" | |
e74dc197 | 87 | #include "misc.h" |
3c0ef626 | 88 | #include "session.h" |
2ce0bfe4 | 89 | #include "kex.h" |
350391c5 | 90 | #include "monitor_wrap.h" |
e74dc197 | 91 | #include "sftp.h" |
3c0ef626 | 92 | |
540d72c3 | 93 | #if defined(KRB5) && defined(USE_AFS) |
94 | #include <kafs.h> | |
95 | #endif | |
96 | ||
3c0ef626 | 97 | /* func */ |
98 | ||
99 | Session *session_new(void); | |
100 | void session_set_fds(Session *, int, int, int); | |
540d72c3 | 101 | void session_pty_cleanup(Session *); |
3c0ef626 | 102 | void session_proctitle(Session *); |
103 | int session_setup_x11fwd(Session *); | |
104 | void do_exec_pty(Session *, const char *); | |
105 | void do_exec_no_pty(Session *, const char *); | |
106 | void do_exec(Session *, const char *); | |
107 | void do_login(Session *, const char *); | |
108 | #ifdef LOGIN_NEEDS_UTMPX | |
109 | static void do_pre_login(Session *s); | |
110 | #endif | |
111 | void do_child(Session *, const char *); | |
112 | void do_motd(void); | |
113 | int check_quietlogin(Session *, const char *); | |
114 | ||
115 | static void do_authenticated1(Authctxt *); | |
116 | static void do_authenticated2(Authctxt *); | |
117 | ||
3c0ef626 | 118 | static int session_pty_req(Session *); |
119 | ||
75be3237 | 120 | #ifdef SESSION_HOOKS |
121 | static void execute_session_hook(char* prog, Authctxt *authctxt, | |
122 | int startup, int save); | |
123 | #endif | |
124 | ||
3c0ef626 | 125 | /* import */ |
126 | extern ServerOptions options; | |
127 | extern char *__progname; | |
128 | extern int log_stderr; | |
129 | extern int debug_flag; | |
130 | extern u_int utmp_len; | |
131 | extern int startup_pipe; | |
132 | extern void destroy_sensitive_data(void); | |
7cac2b65 | 133 | extern Buffer loginmsg; |
3c0ef626 | 134 | |
135 | /* original command from peer. */ | |
136 | const char *original_command = NULL; | |
137 | ||
138 | /* data */ | |
e74dc197 | 139 | #define MAX_SESSIONS 20 |
3c0ef626 | 140 | Session sessions[MAX_SESSIONS]; |
141 | ||
e74dc197 | 142 | #define SUBSYSTEM_NONE 0 |
143 | #define SUBSYSTEM_EXT 1 | |
144 | #define SUBSYSTEM_INT_SFTP 2 | |
145 | ||
3c0ef626 | 146 | #ifdef HAVE_LOGIN_CAP |
350391c5 | 147 | login_cap_t *lc; |
3c0ef626 | 148 | #endif |
149 | ||
540d72c3 | 150 | static int is_child = 0; |
151 | ||
44a053a3 | 152 | /* Name and directory of socket for authentication agent forwarding. */ |
153 | static char *auth_sock_name = NULL; | |
154 | static char *auth_sock_dir = NULL; | |
155 | ||
156 | /* removes the agent forwarding socket */ | |
157 | ||
158 | static void | |
540d72c3 | 159 | auth_sock_cleanup_proc(struct passwd *pw) |
44a053a3 | 160 | { |
44a053a3 | 161 | if (auth_sock_name != NULL) { |
162 | temporarily_use_uid(pw); | |
163 | unlink(auth_sock_name); | |
164 | rmdir(auth_sock_dir); | |
165 | auth_sock_name = NULL; | |
166 | restore_uid(); | |
167 | } | |
168 | } | |
169 | ||
170 | static int | |
171 | auth_input_request_forwarding(struct passwd * pw) | |
172 | { | |
173 | Channel *nc; | |
174 | int sock; | |
175 | struct sockaddr_un sunaddr; | |
176 | ||
177 | if (auth_sock_name != NULL) { | |
178 | error("authentication forwarding requested twice."); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
183 | temporarily_use_uid(pw); | |
184 | ||
185 | /* Allocate a buffer for the socket name, and format the name. */ | |
186 | auth_sock_name = xmalloc(MAXPATHLEN); | |
187 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
540d72c3 | 188 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
44a053a3 | 189 | |
190 | /* Create private directory for socket */ | |
191 | if (mkdtemp(auth_sock_dir) == NULL) { | |
192 | packet_send_debug("Agent forwarding disabled: " | |
193 | "mkdtemp() failed: %.100s", strerror(errno)); | |
194 | restore_uid(); | |
195 | xfree(auth_sock_name); | |
196 | xfree(auth_sock_dir); | |
197 | auth_sock_name = NULL; | |
198 | auth_sock_dir = NULL; | |
199 | return 0; | |
200 | } | |
201 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", | |
202 | auth_sock_dir, (long) getpid()); | |
203 | ||
44a053a3 | 204 | /* Create the socket. */ |
205 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
206 | if (sock < 0) | |
207 | packet_disconnect("socket: %.100s", strerror(errno)); | |
208 | ||
209 | /* Bind it to the name. */ | |
210 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
211 | sunaddr.sun_family = AF_UNIX; | |
212 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
213 | ||
30460aeb | 214 | if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) |
44a053a3 | 215 | packet_disconnect("bind: %.100s", strerror(errno)); |
216 | ||
217 | /* Restore the privileged uid. */ | |
218 | restore_uid(); | |
219 | ||
220 | /* Start listening on the socket. */ | |
540d72c3 | 221 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
44a053a3 | 222 | packet_disconnect("listen: %.100s", strerror(errno)); |
223 | ||
224 | /* Allocate a channel for the authentication agent socket. */ | |
a7213e65 | 225 | /* this shouldn't matter if its hpn or not - cjr */ |
44a053a3 | 226 | nc = channel_new("auth socket", |
227 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
228 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
7cac2b65 | 229 | 0, "auth socket", 1); |
44a053a3 | 230 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
231 | return 1; | |
232 | } | |
233 | ||
540d72c3 | 234 | static void |
235 | display_loginmsg(void) | |
236 | { | |
2ce0bfe4 | 237 | if (buffer_len(&loginmsg) > 0) { |
238 | buffer_append(&loginmsg, "\0", 1); | |
239 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
240 | buffer_clear(&loginmsg); | |
241 | } | |
540d72c3 | 242 | } |
44a053a3 | 243 | |
3c0ef626 | 244 | void |
245 | do_authenticated(Authctxt *authctxt) | |
246 | { | |
bfe49944 | 247 | setproctitle("%s", authctxt->pw->pw_name); |
248 | ||
3c0ef626 | 249 | /* setup the channel layer */ |
250 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
251 | channel_permit_all_opens(); | |
252 | ||
253 | if (compat20) | |
254 | do_authenticated2(authctxt); | |
255 | else | |
256 | do_authenticated1(authctxt); | |
257 | ||
75be3237 | 258 | #ifdef SESSION_HOOKS |
259 | if (options.session_hooks_allow && | |
260 | options.session_hooks_shutdown_cmd) | |
261 | { | |
262 | execute_session_hook(options.session_hooks_shutdown_cmd, | |
263 | authctxt, | |
264 | /* startup = */ 0, /* save = */ 0); | |
265 | ||
266 | if (authctxt->session_env_file) | |
267 | { | |
268 | free(authctxt->session_env_file); | |
269 | } | |
270 | } | |
271 | #endif | |
540d72c3 | 272 | |
273 | do_cleanup(authctxt); | |
3c0ef626 | 274 | } |
275 | ||
276 | /* | |
277 | * Prepares for an interactive session. This is called after the user has | |
278 | * been successfully authenticated. During this message exchange, pseudo | |
279 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
280 | * are requested, etc. | |
281 | */ | |
282 | static void | |
283 | do_authenticated1(Authctxt *authctxt) | |
284 | { | |
285 | Session *s; | |
286 | char *command; | |
e9702f7d | 287 | int success, type, screen_flag; |
276b07a3 | 288 | int enable_compression_after_reply = 0; |
289 | u_int proto_len, data_len, dlen, compression_level = 0; | |
3c0ef626 | 290 | |
291 | s = session_new(); | |
dfddba3d | 292 | if (s == NULL) { |
293 | error("no more sessions"); | |
294 | return; | |
295 | } | |
3c0ef626 | 296 | s->authctxt = authctxt; |
297 | s->pw = authctxt->pw; | |
298 | ||
299 | /* | |
300 | * We stay in this loop until the client requests to execute a shell | |
301 | * or a command. | |
302 | */ | |
303 | for (;;) { | |
304 | success = 0; | |
305 | ||
306 | /* Get a packet from the client. */ | |
e9702f7d | 307 | type = packet_read(); |
3c0ef626 | 308 | |
309 | /* Process the packet. */ | |
310 | switch (type) { | |
311 | case SSH_CMSG_REQUEST_COMPRESSION: | |
3c0ef626 | 312 | compression_level = packet_get_int(); |
e9702f7d | 313 | packet_check_eom(); |
3c0ef626 | 314 | if (compression_level < 1 || compression_level > 9) { |
7e82606e | 315 | packet_send_debug("Received invalid compression level %d.", |
e9702f7d | 316 | compression_level); |
3c0ef626 | 317 | break; |
318 | } | |
2ce0bfe4 | 319 | if (options.compression == COMP_NONE) { |
44a053a3 | 320 | debug2("compression disabled"); |
321 | break; | |
322 | } | |
3c0ef626 | 323 | /* Enable compression after we have responded with SUCCESS. */ |
324 | enable_compression_after_reply = 1; | |
325 | success = 1; | |
326 | break; | |
327 | ||
328 | case SSH_CMSG_REQUEST_PTY: | |
329 | success = session_pty_req(s); | |
330 | break; | |
331 | ||
332 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
333 | s->auth_proto = packet_get_string(&proto_len); | |
334 | s->auth_data = packet_get_string(&data_len); | |
335 | ||
336 | screen_flag = packet_get_protocol_flags() & | |
337 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
338 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
339 | ||
340 | if (packet_remaining() == 4) { | |
341 | if (!screen_flag) | |
342 | debug2("Buggy client: " | |
343 | "X11 screen flag missing"); | |
344 | s->screen = packet_get_int(); | |
345 | } else { | |
346 | s->screen = 0; | |
347 | } | |
e9702f7d | 348 | packet_check_eom(); |
3c0ef626 | 349 | success = session_setup_x11fwd(s); |
350 | if (!success) { | |
351 | xfree(s->auth_proto); | |
352 | xfree(s->auth_data); | |
353 | s->auth_proto = NULL; | |
354 | s->auth_data = NULL; | |
355 | } | |
356 | break; | |
357 | ||
358 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
359 | if (no_agent_forwarding_flag || compat13) { | |
360 | debug("Authentication agent forwarding not permitted for this authentication."); | |
361 | break; | |
362 | } | |
363 | debug("Received authentication agent forwarding request."); | |
364 | success = auth_input_request_forwarding(s->pw); | |
365 | break; | |
366 | ||
367 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
368 | if (no_port_forwarding_flag) { | |
369 | debug("Port forwarding not permitted for this authentication."); | |
370 | break; | |
371 | } | |
372 | if (!options.allow_tcp_forwarding) { | |
373 | debug("Port forwarding not permitted."); | |
374 | break; | |
375 | } | |
376 | debug("Received TCP/IP port forwarding request."); | |
30460aeb | 377 | if (channel_input_port_forward_request(s->pw->pw_uid == 0, |
f713db99 | 378 | options.gateway_ports, options.hpn_disabled, |
379 | options.hpn_buffer_size) < 0) { | |
30460aeb | 380 | debug("Port forwarding failed."); |
381 | break; | |
382 | } | |
3c0ef626 | 383 | success = 1; |
384 | break; | |
385 | ||
386 | case SSH_CMSG_MAX_PACKET_SIZE: | |
387 | if (packet_set_maxsize(packet_get_int()) > 0) | |
388 | success = 1; | |
389 | break; | |
e9702f7d | 390 | |
3c0ef626 | 391 | case SSH_CMSG_EXEC_SHELL: |
392 | case SSH_CMSG_EXEC_CMD: | |
393 | if (type == SSH_CMSG_EXEC_CMD) { | |
394 | command = packet_get_string(&dlen); | |
395 | debug("Exec command '%.500s'", command); | |
396 | do_exec(s, command); | |
397 | xfree(command); | |
398 | } else { | |
399 | do_exec(s, NULL); | |
400 | } | |
e9702f7d | 401 | packet_check_eom(); |
3c0ef626 | 402 | session_close(s); |
403 | return; | |
404 | ||
405 | default: | |
406 | /* | |
407 | * Any unknown messages in this phase are ignored, | |
408 | * and a failure message is returned. | |
409 | */ | |
7cac2b65 | 410 | logit("Unknown packet type received after authentication: %d", type); |
3c0ef626 | 411 | } |
412 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
413 | packet_send(); | |
414 | packet_write_wait(); | |
415 | ||
416 | /* Enable compression now that we have replied if appropriate. */ | |
417 | if (enable_compression_after_reply) { | |
418 | enable_compression_after_reply = 0; | |
419 | packet_start_compression(compression_level); | |
420 | } | |
421 | } | |
422 | } | |
423 | ||
424 | /* | |
425 | * This is called to fork and execute a command when we have no tty. This | |
426 | * will call do_child from the child, and server_loop from the parent after | |
427 | * setting up file descriptors and such. | |
428 | */ | |
429 | void | |
430 | do_exec_no_pty(Session *s, const char *command) | |
431 | { | |
44a053a3 | 432 | pid_t pid; |
3c0ef626 | 433 | |
434 | #ifdef USE_PIPES | |
435 | int pin[2], pout[2], perr[2]; | |
436 | /* Allocate pipes for communicating with the program. */ | |
437 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
438 | packet_disconnect("Could not create pipes: %.100s", | |
439 | strerror(errno)); | |
440 | #else /* USE_PIPES */ | |
441 | int inout[2], err[2]; | |
442 | /* Uses socket pairs to communicate with the program. */ | |
443 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
444 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
445 | packet_disconnect("Could not create socket pairs: %.100s", | |
446 | strerror(errno)); | |
447 | #endif /* USE_PIPES */ | |
448 | if (s == NULL) | |
449 | fatal("do_exec_no_pty: no session"); | |
450 | ||
451 | session_proctitle(s); | |
452 | ||
3c0ef626 | 453 | /* Fork the child. */ |
454 | if ((pid = fork()) == 0) { | |
540d72c3 | 455 | is_child = 1; |
d03f4262 | 456 | |
3c0ef626 | 457 | /* Child. Reinitialize the log since the pid has changed. */ |
458 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
459 | ||
460 | /* | |
461 | * Create a new session and process group since the 4.4BSD | |
462 | * setlogin() affects the entire process group. | |
463 | */ | |
464 | if (setsid() < 0) | |
465 | error("setsid failed: %.100s", strerror(errno)); | |
466 | ||
467 | #ifdef USE_PIPES | |
468 | /* | |
469 | * Redirect stdin. We close the parent side of the socket | |
470 | * pair, and make the child side the standard input. | |
471 | */ | |
472 | close(pin[1]); | |
473 | if (dup2(pin[0], 0) < 0) | |
474 | perror("dup2 stdin"); | |
475 | close(pin[0]); | |
476 | ||
477 | /* Redirect stdout. */ | |
478 | close(pout[0]); | |
479 | if (dup2(pout[1], 1) < 0) | |
480 | perror("dup2 stdout"); | |
481 | close(pout[1]); | |
482 | ||
483 | /* Redirect stderr. */ | |
484 | close(perr[0]); | |
485 | if (dup2(perr[1], 2) < 0) | |
486 | perror("dup2 stderr"); | |
487 | close(perr[1]); | |
488 | #else /* USE_PIPES */ | |
489 | /* | |
490 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
491 | * use the same socket, as some programs (particularly rdist) | |
492 | * seem to depend on it. | |
493 | */ | |
494 | close(inout[1]); | |
495 | close(err[1]); | |
496 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
497 | perror("dup2 stdin"); | |
498 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
499 | perror("dup2 stdout"); | |
500 | if (dup2(err[0], 2) < 0) /* stderr */ | |
501 | perror("dup2 stderr"); | |
502 | #endif /* USE_PIPES */ | |
503 | ||
d03f4262 | 504 | #ifdef _UNICOS |
505 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
506 | #endif | |
507 | ||
3c0ef626 | 508 | /* Do processing for the child (exec command etc). */ |
509 | do_child(s, command); | |
510 | /* NOTREACHED */ | |
511 | } | |
d03f4262 | 512 | #ifdef _UNICOS |
513 | signal(WJSIGNAL, cray_job_termination_handler); | |
514 | #endif /* _UNICOS */ | |
3c0ef626 | 515 | #ifdef HAVE_CYGWIN |
516 | if (is_winnt) | |
517 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
518 | #endif | |
519 | if (pid < 0) | |
520 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
521 | s->pid = pid; | |
522 | /* Set interactive/non-interactive mode. */ | |
523 | packet_set_interactive(s->display != NULL); | |
524 | #ifdef USE_PIPES | |
525 | /* We are the parent. Close the child sides of the pipes. */ | |
526 | close(pin[0]); | |
527 | close(pout[1]); | |
528 | close(perr[1]); | |
529 | ||
530 | if (compat20) { | |
7e82606e | 531 | if (s->is_subsystem) { |
532 | close(perr[0]); | |
533 | perr[0] = -1; | |
534 | } | |
535 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
3c0ef626 | 536 | } else { |
537 | /* Enter the interactive session. */ | |
538 | server_loop(pid, pin[1], pout[0], perr[0]); | |
539 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ | |
540 | } | |
541 | #else /* USE_PIPES */ | |
542 | /* We are the parent. Close the child sides of the socket pairs. */ | |
543 | close(inout[0]); | |
544 | close(err[0]); | |
545 | ||
12a403af | 546 | /* |
547 | * Clear loginmsg, since it's the child's responsibility to display | |
548 | * it to the user, otherwise multiple sessions may accumulate | |
549 | * multiple copies of the login messages. | |
550 | */ | |
551 | buffer_clear(&loginmsg); | |
552 | ||
3c0ef626 | 553 | /* |
554 | * Enter the interactive session. Note: server_loop must be able to | |
555 | * handle the case that fdin and fdout are the same. | |
556 | */ | |
557 | if (compat20) { | |
558 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); | |
559 | } else { | |
560 | server_loop(pid, inout[1], inout[1], err[1]); | |
561 | /* server_loop has closed inout[1] and err[1]. */ | |
562 | } | |
563 | #endif /* USE_PIPES */ | |
564 | } | |
565 | ||
566 | /* | |
567 | * This is called to fork and execute a command when we have a tty. This | |
568 | * will call do_child from the child, and server_loop from the parent after | |
569 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
570 | * lastlog, and other such operations. | |
571 | */ | |
572 | void | |
573 | do_exec_pty(Session *s, const char *command) | |
574 | { | |
575 | int fdout, ptyfd, ttyfd, ptymaster; | |
576 | pid_t pid; | |
577 | ||
578 | if (s == NULL) | |
579 | fatal("do_exec_pty: no session"); | |
580 | ptyfd = s->ptyfd; | |
581 | ttyfd = s->ttyfd; | |
582 | ||
3c0ef626 | 583 | /* Fork the child. */ |
584 | if ((pid = fork()) == 0) { | |
540d72c3 | 585 | is_child = 1; |
3c0ef626 | 586 | |
587 | /* Child. Reinitialize the log because the pid has changed. */ | |
588 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
589 | /* Close the master side of the pseudo tty. */ | |
590 | close(ptyfd); | |
591 | ||
592 | /* Make the pseudo tty our controlling tty. */ | |
593 | pty_make_controlling_tty(&ttyfd, s->tty); | |
594 | ||
595 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ | |
596 | if (dup2(ttyfd, 0) < 0) | |
597 | error("dup2 stdin: %s", strerror(errno)); | |
598 | if (dup2(ttyfd, 1) < 0) | |
599 | error("dup2 stdout: %s", strerror(errno)); | |
600 | if (dup2(ttyfd, 2) < 0) | |
601 | error("dup2 stderr: %s", strerror(errno)); | |
602 | ||
603 | /* Close the extra descriptor for the pseudo tty. */ | |
604 | close(ttyfd); | |
605 | ||
606 | /* record login, etc. similar to login(1) */ | |
607 | #ifndef HAVE_OSF_SIA | |
d03f4262 | 608 | if (!(options.use_login && command == NULL)) { |
609 | #ifdef _UNICOS | |
610 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
611 | #endif /* _UNICOS */ | |
3c0ef626 | 612 | do_login(s, command); |
d03f4262 | 613 | } |
3c0ef626 | 614 | # ifdef LOGIN_NEEDS_UTMPX |
615 | else | |
616 | do_pre_login(s); | |
617 | # endif | |
618 | #endif | |
619 | ||
620 | /* Do common processing for the child, such as execing the command. */ | |
621 | do_child(s, command); | |
622 | /* NOTREACHED */ | |
623 | } | |
d03f4262 | 624 | #ifdef _UNICOS |
625 | signal(WJSIGNAL, cray_job_termination_handler); | |
626 | #endif /* _UNICOS */ | |
3c0ef626 | 627 | #ifdef HAVE_CYGWIN |
628 | if (is_winnt) | |
629 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
630 | #endif | |
631 | if (pid < 0) | |
632 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
633 | s->pid = pid; | |
634 | ||
635 | /* Parent. Close the slave side of the pseudo tty. */ | |
636 | close(ttyfd); | |
637 | ||
638 | /* | |
639 | * Create another descriptor of the pty master side for use as the | |
640 | * standard input. We could use the original descriptor, but this | |
641 | * simplifies code in server_loop. The descriptor is bidirectional. | |
642 | */ | |
643 | fdout = dup(ptyfd); | |
644 | if (fdout < 0) | |
645 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
646 | ||
647 | /* we keep a reference to the pty master */ | |
648 | ptymaster = dup(ptyfd); | |
649 | if (ptymaster < 0) | |
650 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
651 | s->ptymaster = ptymaster; | |
652 | ||
653 | /* Enter interactive session. */ | |
654 | packet_set_interactive(1); | |
655 | if (compat20) { | |
656 | session_set_fds(s, ptyfd, fdout, -1); | |
657 | } else { | |
658 | server_loop(pid, ptyfd, fdout, -1); | |
659 | /* server_loop _has_ closed ptyfd and fdout. */ | |
660 | } | |
661 | } | |
662 | ||
663 | #ifdef LOGIN_NEEDS_UTMPX | |
664 | static void | |
665 | do_pre_login(Session *s) | |
666 | { | |
667 | socklen_t fromlen; | |
668 | struct sockaddr_storage from; | |
669 | pid_t pid = getpid(); | |
670 | ||
671 | /* | |
672 | * Get IP address of client. If the connection is not a socket, let | |
673 | * the address be 0.0.0.0. | |
674 | */ | |
675 | memset(&from, 0, sizeof(from)); | |
d03f4262 | 676 | fromlen = sizeof(from); |
3c0ef626 | 677 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 678 | if (getpeername(packet_get_connection_in(), |
30460aeb | 679 | (struct sockaddr *)&from, &fromlen) < 0) { |
3c0ef626 | 680 | debug("getpeername: %.100s", strerror(errno)); |
540d72c3 | 681 | cleanup_exit(255); |
3c0ef626 | 682 | } |
683 | } | |
684 | ||
685 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
7cac2b65 | 686 | get_remote_name_or_ip(utmp_len, options.use_dns), |
bfe49944 | 687 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 688 | } |
689 | #endif | |
690 | ||
691 | /* | |
692 | * This is called to fork and execute a command. If another command is | |
693 | * to be forced, execute that instead. | |
694 | */ | |
695 | void | |
696 | do_exec(Session *s, const char *command) | |
697 | { | |
30460aeb | 698 | if (options.adm_forced_command) { |
699 | original_command = command; | |
700 | command = options.adm_forced_command; | |
e74dc197 | 701 | if (strcmp(INTERNAL_SFTP_NAME, command) == 0) |
702 | s->is_subsystem = SUBSYSTEM_INT_SFTP; | |
703 | else if (s->is_subsystem) | |
704 | s->is_subsystem = SUBSYSTEM_EXT; | |
30460aeb | 705 | debug("Forced command (config) '%.900s'", command); |
706 | } else if (forced_command) { | |
3c0ef626 | 707 | original_command = command; |
708 | command = forced_command; | |
e74dc197 | 709 | if (strcmp(INTERNAL_SFTP_NAME, command) == 0) |
710 | s->is_subsystem = SUBSYSTEM_INT_SFTP; | |
711 | else if (s->is_subsystem) | |
712 | s->is_subsystem = SUBSYSTEM_EXT; | |
30460aeb | 713 | debug("Forced command (key option) '%.900s'", command); |
3c0ef626 | 714 | } |
715 | ||
7cac2b65 | 716 | #if defined(SESSION_HOOKS) |
717 | if (options.session_hooks_allow && | |
718 | (options.session_hooks_startup_cmd || | |
719 | options.session_hooks_shutdown_cmd)) | |
720 | { | |
721 | char env_file[1000]; | |
722 | struct stat st; | |
723 | do | |
724 | { | |
725 | snprintf(env_file, | |
726 | sizeof(env_file), | |
727 | "/tmp/ssh_env_%d%d%d", | |
728 | getuid(), | |
729 | getpid(), | |
730 | rand()); | |
731 | } while (stat(env_file, &st)==0); | |
732 | s->authctxt->session_env_file = strdup(env_file); | |
733 | } | |
734 | #endif | |
735 | ||
dfddba3d | 736 | #ifdef SSH_AUDIT_EVENTS |
737 | if (command != NULL) | |
738 | PRIVSEP(audit_run_command(command)); | |
739 | else if (s->ttyfd == -1) { | |
740 | char *shell = s->pw->pw_shell; | |
741 | ||
742 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
743 | shell =_PATH_BSHELL; | |
744 | PRIVSEP(audit_run_command(shell)); | |
745 | } | |
746 | #endif | |
3c0ef626 | 747 | if (s->ttyfd != -1) |
748 | do_exec_pty(s, command); | |
749 | else | |
750 | do_exec_no_pty(s, command); | |
751 | ||
752 | original_command = NULL; | |
3c0ef626 | 753 | |
7e82606e | 754 | /* |
755 | * Clear loginmsg: it's the child's responsibility to display | |
756 | * it to the user, otherwise multiple sessions may accumulate | |
757 | * multiple copies of the login messages. | |
758 | */ | |
759 | buffer_clear(&loginmsg); | |
760 | } | |
e9702f7d | 761 | |
3c0ef626 | 762 | /* administrative, login(1)-like work */ |
763 | void | |
764 | do_login(Session *s, const char *command) | |
765 | { | |
3c0ef626 | 766 | socklen_t fromlen; |
767 | struct sockaddr_storage from; | |
3c0ef626 | 768 | struct passwd * pw = s->pw; |
769 | pid_t pid = getpid(); | |
770 | ||
771 | /* | |
772 | * Get IP address of client. If the connection is not a socket, let | |
773 | * the address be 0.0.0.0. | |
774 | */ | |
775 | memset(&from, 0, sizeof(from)); | |
bfe49944 | 776 | fromlen = sizeof(from); |
3c0ef626 | 777 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 778 | if (getpeername(packet_get_connection_in(), |
e9702f7d | 779 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 780 | debug("getpeername: %.100s", strerror(errno)); |
540d72c3 | 781 | cleanup_exit(255); |
3c0ef626 | 782 | } |
783 | } | |
784 | ||
3c0ef626 | 785 | /* Record that there was a login on that tty from the remote host. */ |
350391c5 | 786 | if (!use_privsep) |
787 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
788 | get_remote_name_or_ip(utmp_len, | |
7cac2b65 | 789 | options.use_dns), |
d03f4262 | 790 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 791 | |
792 | #ifdef USE_PAM | |
793 | /* | |
794 | * If password change is needed, do it now. | |
795 | * This needs to occur before the ~/.hushlogin check. | |
796 | */ | |
540d72c3 | 797 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
798 | display_loginmsg(); | |
3c0ef626 | 799 | do_pam_chauthtok(); |
540d72c3 | 800 | s->authctxt->force_pwchange = 0; |
7cac2b65 | 801 | /* XXX - signal [net] parent to enable forwardings */ |
3c0ef626 | 802 | } |
803 | #endif | |
804 | ||
805 | if (check_quietlogin(s, command)) | |
806 | return; | |
807 | ||
540d72c3 | 808 | display_loginmsg(); |
3c0ef626 | 809 | |
3c0ef626 | 810 | do_motd(); |
811 | } | |
812 | ||
813 | /* | |
814 | * Display the message of the day. | |
815 | */ | |
816 | void | |
817 | do_motd(void) | |
818 | { | |
819 | FILE *f; | |
820 | char buf[256]; | |
821 | ||
822 | if (options.print_motd) { | |
823 | #ifdef HAVE_LOGIN_CAP | |
824 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
825 | "/etc/motd"), "r"); | |
826 | #else | |
827 | f = fopen("/etc/motd", "r"); | |
828 | #endif | |
829 | if (f) { | |
830 | while (fgets(buf, sizeof(buf), f)) | |
831 | fputs(buf, stdout); | |
832 | fclose(f); | |
833 | } | |
834 | } | |
835 | } | |
836 | ||
837 | ||
838 | /* | |
839 | * Check for quiet login, either .hushlogin or command given. | |
840 | */ | |
841 | int | |
842 | check_quietlogin(Session *s, const char *command) | |
843 | { | |
844 | char buf[256]; | |
845 | struct passwd *pw = s->pw; | |
846 | struct stat st; | |
847 | ||
848 | /* Return 1 if .hushlogin exists or a command given. */ | |
849 | if (command != NULL) | |
850 | return 1; | |
851 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
852 | #ifdef HAVE_LOGIN_CAP | |
853 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
854 | return 1; | |
855 | #else | |
856 | if (stat(buf, &st) >= 0) | |
857 | return 1; | |
858 | #endif | |
859 | return 0; | |
860 | } | |
861 | ||
862 | /* | |
863 | * Sets the value of the given variable in the environment. If the variable | |
864 | * already exists, its value is overriden. | |
865 | */ | |
5598e598 | 866 | void |
3c0ef626 | 867 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
e9702f7d | 868 | const char *value) |
3c0ef626 | 869 | { |
3c0ef626 | 870 | char **env; |
29d88157 | 871 | u_int envsize; |
872 | u_int i, namelen; | |
3c0ef626 | 873 | |
7cac2b65 | 874 | /* |
875 | * If we're passed an uninitialized list, allocate a single null | |
876 | * entry before continuing. | |
877 | */ | |
878 | if (*envp == NULL && *envsizep == 0) { | |
879 | *envp = xmalloc(sizeof(char *)); | |
880 | *envp[0] = NULL; | |
881 | *envsizep = 1; | |
882 | } | |
883 | ||
3c0ef626 | 884 | /* |
885 | * Find the slot where the value should be stored. If the variable | |
886 | * already exists, we reuse the slot; otherwise we append a new slot | |
887 | * at the end of the array, expanding if necessary. | |
888 | */ | |
889 | env = *envp; | |
890 | namelen = strlen(name); | |
891 | for (i = 0; env[i]; i++) | |
892 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
893 | break; | |
894 | if (env[i]) { | |
895 | /* Reuse the slot. */ | |
896 | xfree(env[i]); | |
897 | } else { | |
898 | /* New variable. Expand if necessary. */ | |
29d88157 | 899 | envsize = *envsizep; |
900 | if (i >= envsize - 1) { | |
901 | if (envsize >= 1000) | |
902 | fatal("child_set_env: too many env vars"); | |
903 | envsize += 50; | |
30460aeb | 904 | env = (*envp) = xrealloc(env, envsize, sizeof(char *)); |
29d88157 | 905 | *envsizep = envsize; |
3c0ef626 | 906 | } |
907 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
908 | env[i + 1] = NULL; | |
909 | } | |
910 | ||
911 | /* Allocate space and format the variable in the appropriate slot. */ | |
912 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
913 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
914 | } | |
915 | ||
916 | /* | |
917 | * Reads environment variables from the given file and adds/overrides them | |
918 | * into the environment. If the file does not exist, this does nothing. | |
919 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
920 | * and assignments of the form name=value. No other forms are allowed. | |
921 | */ | |
922 | static void | |
923 | read_environment_file(char ***env, u_int *envsize, | |
e9702f7d | 924 | const char *filename) |
3c0ef626 | 925 | { |
926 | FILE *f; | |
927 | char buf[4096]; | |
928 | char *cp, *value; | |
276b07a3 | 929 | u_int lineno = 0; |
3c0ef626 | 930 | |
931 | f = fopen(filename, "r"); | |
932 | if (!f) | |
933 | return; | |
934 | ||
935 | while (fgets(buf, sizeof(buf), f)) { | |
276b07a3 | 936 | if (++lineno > 1000) |
937 | fatal("Too many lines in environment file %s", filename); | |
3c0ef626 | 938 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
939 | ; | |
940 | if (!*cp || *cp == '#' || *cp == '\n') | |
941 | continue; | |
e74dc197 | 942 | |
943 | cp[strcspn(cp, "\n")] = '\0'; | |
944 | ||
3c0ef626 | 945 | value = strchr(cp, '='); |
946 | if (value == NULL) { | |
276b07a3 | 947 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
948 | filename); | |
3c0ef626 | 949 | continue; |
950 | } | |
951 | /* | |
952 | * Replace the equals sign by nul, and advance value to | |
953 | * the value string. | |
954 | */ | |
955 | *value = '\0'; | |
956 | value++; | |
957 | child_set_env(env, envsize, cp, value); | |
958 | } | |
959 | fclose(f); | |
960 | } | |
961 | ||
75be3237 | 962 | #ifdef SESSION_HOOKS |
963 | #define SSH_SESSION_ENV_FILE "SSH_SESSION_ENV_FILE" | |
964 | ||
965 | typedef enum { no_op, execute, clear_env, restore_env, | |
966 | read_env, save_or_rm_env } session_action_t; | |
967 | ||
968 | static session_action_t action_order[2][5] = { | |
969 | { clear_env, read_env, execute, save_or_rm_env, restore_env }, /*shutdown*/ | |
970 | { execute, read_env, save_or_rm_env, no_op, no_op } /*startup */ | |
971 | }; | |
972 | ||
973 | static | |
974 | void execute_session_hook(char* prog, Authctxt *authctxt, | |
975 | int startup, int save) | |
976 | { | |
977 | extern char **environ; | |
978 | ||
979 | struct stat st; | |
980 | char **saved_env, **tmpenv; | |
981 | char *env_file = authctxt->session_env_file; | |
982 | int i, status = 0; | |
983 | ||
984 | for (i=0; i<5; i++) | |
985 | { | |
986 | switch (action_order[startup][i]) | |
987 | { | |
988 | case no_op: | |
989 | break; | |
990 | ||
991 | case execute: | |
992 | { | |
993 | FILE* fp; | |
994 | char buf[1000]; | |
995 | ||
996 | snprintf(buf, | |
997 | sizeof(buf), | |
998 | "%s -c '%s'", | |
999 | authctxt->pw->pw_shell, | |
1000 | prog); | |
1001 | ||
1002 | debug("executing session hook: [%s]", buf); | |
1003 | setenv(SSH_SESSION_ENV_FILE, env_file, /* overwrite = */ 1); | |
1004 | ||
1005 | /* flusing is recommended in the popen(3) man page, to avoid | |
1006 | intermingling of output */ | |
1007 | fflush(stdout); | |
1008 | fflush(stderr); | |
1009 | if ((fp=popen(buf, "w")) == NULL) | |
1010 | { | |
1011 | perror("Unable to run session hook"); | |
1012 | return; | |
1013 | } | |
1014 | status = pclose(fp); | |
1015 | debug2("session hook executed, status=%d", status); | |
1016 | unsetenv(SSH_SESSION_ENV_FILE); | |
1017 | } | |
1018 | break; | |
1019 | ||
1020 | case clear_env: | |
1021 | saved_env = environ; | |
1022 | tmpenv = (char**) malloc(sizeof(char*)); | |
1023 | tmpenv[0] = NULL; | |
1024 | environ = tmpenv; | |
1025 | break; | |
1026 | ||
1027 | case restore_env: | |
1028 | environ = saved_env; | |
1029 | free(tmpenv); | |
1030 | break; | |
1031 | ||
1032 | case read_env: | |
1033 | if (status==0 && stat(env_file, &st)==0) | |
1034 | { | |
1035 | int envsize = 0; | |
1036 | ||
1037 | debug("reading environment from %s", env_file); | |
1038 | while (environ[envsize++]) ; | |
1039 | read_environment_file(&environ, &envsize, env_file); | |
1040 | } | |
1041 | break; | |
1042 | ||
1043 | case save_or_rm_env: | |
1044 | if (status==0 && save) | |
1045 | { | |
1046 | FILE* fp; | |
1047 | int envcount=0; | |
1048 | ||
1049 | debug2("saving environment to %s", env_file); | |
1050 | if ((fp = fopen(env_file, "w")) == NULL) /* hmm: file perms? */ | |
1051 | { | |
1052 | perror("Unable to save session hook info"); | |
1053 | } | |
1054 | while (environ[envcount]) | |
1055 | { | |
1056 | fprintf(fp, "%s\n", environ[envcount++]); | |
1057 | } | |
1058 | fflush(fp); | |
1059 | fclose(fp); | |
1060 | } | |
1061 | else if (stat(env_file, &st)==0) | |
1062 | { | |
1063 | debug2("removing environment file %s", env_file); | |
1064 | remove(env_file); | |
1065 | } | |
1066 | break; | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | } | |
1071 | #endif | |
1072 | ||
7cac2b65 | 1073 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
1074 | /* | |
1075 | * Return named variable from specified environment, or NULL if not present. | |
1076 | */ | |
1077 | static char * | |
1078 | child_get_env(char **env, const char *name) | |
1079 | { | |
1080 | int i; | |
1081 | size_t len; | |
1082 | ||
1083 | len = strlen(name); | |
1084 | for (i=0; env[i] != NULL; i++) | |
1085 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
1086 | return(env[i] + len + 1); | |
1087 | return NULL; | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * Read /etc/default/login. | |
1092 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
1093 | */ | |
1094 | static void | |
1095 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
1096 | { | |
1097 | char **tmpenv = NULL, *var; | |
29d88157 | 1098 | u_int i, tmpenvsize = 0; |
540d72c3 | 1099 | u_long mask; |
7cac2b65 | 1100 | |
1101 | /* | |
1102 | * We don't want to copy the whole file to the child's environment, | |
1103 | * so we use a temporary environment and copy the variables we're | |
1104 | * interested in. | |
1105 | */ | |
1106 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
1107 | ||
29d88157 | 1108 | if (tmpenv == NULL) |
1109 | return; | |
1110 | ||
7cac2b65 | 1111 | if (uid == 0) |
1112 | var = child_get_env(tmpenv, "SUPATH"); | |
1113 | else | |
1114 | var = child_get_env(tmpenv, "PATH"); | |
1115 | if (var != NULL) | |
1116 | child_set_env(env, envsize, "PATH", var); | |
540d72c3 | 1117 | |
7cac2b65 | 1118 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
1119 | if (sscanf(var, "%5lo", &mask) == 1) | |
540d72c3 | 1120 | umask((mode_t)mask); |
1121 | ||
7cac2b65 | 1122 | for (i = 0; tmpenv[i] != NULL; i++) |
1123 | xfree(tmpenv[i]); | |
1124 | xfree(tmpenv); | |
1125 | } | |
1126 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1127 | ||
2ce0bfe4 | 1128 | void |
1129 | copy_environment(char **source, char ***env, u_int *envsize) | |
3c0ef626 | 1130 | { |
e9702f7d | 1131 | char *var_name, *var_val; |
3c0ef626 | 1132 | int i; |
1133 | ||
e9702f7d | 1134 | if (source == NULL) |
3c0ef626 | 1135 | return; |
1136 | ||
e9702f7d | 1137 | for(i = 0; source[i] != NULL; i++) { |
1138 | var_name = xstrdup(source[i]); | |
1139 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
1140 | xfree(var_name); | |
3c0ef626 | 1141 | continue; |
3c0ef626 | 1142 | } |
e9702f7d | 1143 | *var_val++ = '\0'; |
3c0ef626 | 1144 | |
e9702f7d | 1145 | debug3("Copy environment: %s=%s", var_name, var_val); |
1146 | child_set_env(env, envsize, var_name, var_val); | |
540d72c3 | 1147 | |
e9702f7d | 1148 | xfree(var_name); |
3c0ef626 | 1149 | } |
3c0ef626 | 1150 | } |
1151 | ||
e9702f7d | 1152 | static char ** |
1153 | do_setup_env(Session *s, const char *shell) | |
3c0ef626 | 1154 | { |
3c0ef626 | 1155 | char buf[256]; |
e9702f7d | 1156 | u_int i, envsize; |
30460aeb | 1157 | char **env, *laddr; |
e9702f7d | 1158 | struct passwd *pw = s->pw; |
30460aeb | 1159 | #ifndef HAVE_LOGIN_CAP |
1160 | char *path = NULL; | |
1161 | #endif | |
3c0ef626 | 1162 | |
1163 | /* Initialize the environment. */ | |
1164 | envsize = 100; | |
30460aeb | 1165 | env = xcalloc(envsize, sizeof(char *)); |
3c0ef626 | 1166 | env[0] = NULL; |
1167 | ||
1168 | #ifdef HAVE_CYGWIN | |
1169 | /* | |
1170 | * The Windows environment contains some setting which are | |
1171 | * important for a running system. They must not be dropped. | |
1172 | */ | |
dfddba3d | 1173 | { |
1174 | char **p; | |
1175 | ||
1176 | p = fetch_windows_environment(); | |
1177 | copy_environment(p, &env, &envsize); | |
1178 | free_windows_environment(p); | |
1179 | } | |
3c0ef626 | 1180 | #endif |
1181 | ||
5598e598 | 1182 | #ifdef GSSAPI |
540d72c3 | 1183 | /* Allow any GSSAPI methods that we've used to alter |
5598e598 | 1184 | * the childs environment as they see fit |
1185 | */ | |
7cac2b65 | 1186 | ssh_gssapi_do_child(&env, &envsize); |
5598e598 | 1187 | #endif |
1188 | ||
3c0ef626 | 1189 | if (!options.use_login) { |
1190 | /* Set basic environment. */ | |
7e82606e | 1191 | for (i = 0; i < s->num_env; i++) |
1192 | child_set_env(&env, &envsize, s->env[i].name, | |
1193 | s->env[i].val); | |
1194 | ||
3c0ef626 | 1195 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1196 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
bfe49944 | 1197 | #ifdef _AIX |
1198 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1199 | #endif | |
3c0ef626 | 1200 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
1201 | #ifdef HAVE_LOGIN_CAP | |
d03f4262 | 1202 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1203 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1204 | else | |
1205 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
3c0ef626 | 1206 | #else /* HAVE_LOGIN_CAP */ |
1207 | # ifndef HAVE_CYGWIN | |
1208 | /* | |
1209 | * There's no standard path on Windows. The path contains | |
1210 | * important components pointing to the system directories, | |
1211 | * needed for loading shared libraries. So the path better | |
1212 | * remains intact here. | |
1213 | */ | |
7cac2b65 | 1214 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1215 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1216 | path = child_get_env(env, "PATH"); | |
1217 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1218 | if (path == NULL || *path == '\0') { | |
540d72c3 | 1219 | child_set_env(&env, &envsize, "PATH", |
7cac2b65 | 1220 | s->pw->pw_uid == 0 ? |
1221 | SUPERUSER_PATH : _PATH_STDPATH); | |
1222 | } | |
3c0ef626 | 1223 | # endif /* HAVE_CYGWIN */ |
1224 | #endif /* HAVE_LOGIN_CAP */ | |
1225 | ||
1226 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1227 | _PATH_MAILDIR, pw->pw_name); | |
1228 | child_set_env(&env, &envsize, "MAIL", buf); | |
1229 | ||
1230 | /* Normal systems set SHELL by default. */ | |
1231 | child_set_env(&env, &envsize, "SHELL", shell); | |
1232 | } | |
1233 | if (getenv("TZ")) | |
1234 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1235 | ||
1752c22a | 1236 | #ifdef GSI /* GSI shared libs typically installed in non-system locations. */ |
1237 | { | |
1238 | char *cp; | |
1239 | ||
1240 | if ((cp = getenv("LD_LIBRARY_PATH")) != NULL) | |
1241 | child_set_env(&env, &envsize, "LD_LIBRARY_PATH", cp); | |
1242 | if ((cp = getenv("LIBPATH")) != NULL) | |
1243 | child_set_env(&env, &envsize, "LIBPATH", cp); | |
1244 | if ((cp = getenv("SHLIB_PATH")) != NULL) | |
1245 | child_set_env(&env, &envsize, "SHLIB_PATH", cp); | |
1246 | if ((cp = getenv("LD_LIBRARYN32_PATH")) != NULL) | |
1247 | child_set_env(&env, &envsize, "LD_LIBRARYN32_PATH",cp); | |
1248 | if ((cp = getenv("LD_LIBRARY64_PATH")) != NULL) | |
1249 | child_set_env(&env, &envsize, "LD_LIBRARY64_PATH",cp); | |
1250 | } | |
1251 | #endif | |
1252 | ||
3c0ef626 | 1253 | /* Set custom environment options from RSA authentication. */ |
1254 | if (!options.use_login) { | |
1255 | while (custom_environment) { | |
1256 | struct envstring *ce = custom_environment; | |
d03f4262 | 1257 | char *str = ce->s; |
e9702f7d | 1258 | |
d03f4262 | 1259 | for (i = 0; str[i] != '=' && str[i]; i++) |
3c0ef626 | 1260 | ; |
d03f4262 | 1261 | if (str[i] == '=') { |
1262 | str[i] = 0; | |
1263 | child_set_env(&env, &envsize, str, str + i + 1); | |
3c0ef626 | 1264 | } |
1265 | custom_environment = ce->next; | |
1266 | xfree(ce->s); | |
1267 | xfree(ce); | |
1268 | } | |
1269 | } | |
1270 | ||
d03f4262 | 1271 | /* SSH_CLIENT deprecated */ |
3c0ef626 | 1272 | snprintf(buf, sizeof buf, "%.50s %d %d", |
e9702f7d | 1273 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
3c0ef626 | 1274 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1275 | ||
bfe49944 | 1276 | laddr = get_local_ipaddr(packet_get_connection_in()); |
d03f4262 | 1277 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
bfe49944 | 1278 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1279 | xfree(laddr); | |
d03f4262 | 1280 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1281 | ||
3c0ef626 | 1282 | if (s->ttyfd != -1) |
1283 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1284 | if (s->term) | |
1285 | child_set_env(&env, &envsize, "TERM", s->term); | |
1286 | if (s->display) | |
1287 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
1288 | if (original_command) | |
1289 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1290 | original_command); | |
1291 | ||
d03f4262 | 1292 | #ifdef _UNICOS |
1293 | if (cray_tmpdir[0] != '\0') | |
1294 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1295 | #endif /* _UNICOS */ | |
1296 | ||
dfddba3d | 1297 | /* |
1298 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1299 | * must have been set by a native authentication method (eg AIX or | |
1300 | * SIA), so copy it to the child. | |
1301 | */ | |
1302 | { | |
1303 | char *cp; | |
1304 | ||
1305 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1306 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1307 | } | |
1308 | ||
3c0ef626 | 1309 | #ifdef _AIX |
e9702f7d | 1310 | { |
1311 | char *cp; | |
1312 | ||
1313 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1314 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
e9702f7d | 1315 | read_environment_file(&env, &envsize, "/etc/environment"); |
1316 | } | |
3c0ef626 | 1317 | #endif |
3c0ef626 | 1318 | #ifdef KRB5 |
12a403af | 1319 | if (s->authctxt->krb5_ccname) |
3c0ef626 | 1320 | child_set_env(&env, &envsize, "KRB5CCNAME", |
12a403af | 1321 | s->authctxt->krb5_ccname); |
3c0ef626 | 1322 | #endif |
1323 | #ifdef USE_PAM | |
d03f4262 | 1324 | /* |
1325 | * Pull in any environment variables that may have | |
1326 | * been set by PAM. | |
1327 | */ | |
7cac2b65 | 1328 | if (options.use_pam) { |
540d72c3 | 1329 | char **p; |
d03f4262 | 1330 | |
540d72c3 | 1331 | p = fetch_pam_child_environment(); |
1332 | copy_environment(p, &env, &envsize); | |
1333 | free_pam_environment(p); | |
1334 | ||
1335 | p = fetch_pam_environment(); | |
d03f4262 | 1336 | copy_environment(p, &env, &envsize); |
1337 | free_pam_environment(p); | |
1338 | } | |
3c0ef626 | 1339 | #endif /* USE_PAM */ |
1340 | ||
44a053a3 | 1341 | if (auth_sock_name != NULL) |
3c0ef626 | 1342 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
44a053a3 | 1343 | auth_sock_name); |
3c0ef626 | 1344 | |
1345 | /* read $HOME/.ssh/environment. */ | |
d03f4262 | 1346 | if (options.permit_user_env && !options.use_login) { |
3c0ef626 | 1347 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
d03f4262 | 1348 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
3c0ef626 | 1349 | read_environment_file(&env, &envsize, buf); |
1350 | } | |
1351 | if (debug_flag) { | |
1352 | /* dump the environment */ | |
1353 | fprintf(stderr, "Environment:\n"); | |
1354 | for (i = 0; env[i]; i++) | |
1355 | fprintf(stderr, " %.200s\n", env[i]); | |
1356 | } | |
e9702f7d | 1357 | return env; |
1358 | } | |
1359 | ||
1360 | /* | |
1361 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1362 | * first in this order). | |
1363 | */ | |
1364 | static void | |
1365 | do_rc_files(Session *s, const char *shell) | |
1366 | { | |
1367 | FILE *f = NULL; | |
1368 | char cmd[1024]; | |
1369 | int do_xauth; | |
1370 | struct stat st; | |
1371 | ||
1372 | do_xauth = | |
1373 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1374 | ||
e74dc197 | 1375 | /* ignore _PATH_SSH_USER_RC for subsystems and admin forced commands */ |
1376 | if (!s->is_subsystem && options.adm_forced_command == NULL && | |
1377 | !no_user_rc && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
e9702f7d | 1378 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", |
1379 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1380 | if (debug_flag) | |
1381 | fprintf(stderr, "Running %s\n", cmd); | |
1382 | f = popen(cmd, "w"); | |
1383 | if (f) { | |
1384 | if (do_xauth) | |
1385 | fprintf(f, "%s %s\n", s->auth_proto, | |
1386 | s->auth_data); | |
1387 | pclose(f); | |
1388 | } else | |
1389 | fprintf(stderr, "Could not run %s\n", | |
1390 | _PATH_SSH_USER_RC); | |
1391 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1392 | if (debug_flag) | |
1393 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1394 | _PATH_SSH_SYSTEM_RC); | |
1395 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1396 | if (f) { | |
1397 | if (do_xauth) | |
1398 | fprintf(f, "%s %s\n", s->auth_proto, | |
1399 | s->auth_data); | |
1400 | pclose(f); | |
1401 | } else | |
1402 | fprintf(stderr, "Could not run %s\n", | |
1403 | _PATH_SSH_SYSTEM_RC); | |
1404 | } else if (do_xauth && options.xauth_location != NULL) { | |
1405 | /* Add authority data to .Xauthority if appropriate. */ | |
1406 | if (debug_flag) { | |
1407 | fprintf(stderr, | |
bfe49944 | 1408 | "Running %.500s remove %.100s\n", |
540d72c3 | 1409 | options.xauth_location, s->auth_display); |
bfe49944 | 1410 | fprintf(stderr, |
1411 | "%.500s add %.100s %.100s %.100s\n", | |
e9702f7d | 1412 | options.xauth_location, s->auth_display, |
1413 | s->auth_proto, s->auth_data); | |
1414 | } | |
1415 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1416 | options.xauth_location); | |
1417 | f = popen(cmd, "w"); | |
1418 | if (f) { | |
bfe49944 | 1419 | fprintf(f, "remove %s\n", |
1420 | s->auth_display); | |
e9702f7d | 1421 | fprintf(f, "add %s %s %s\n", |
1422 | s->auth_display, s->auth_proto, | |
1423 | s->auth_data); | |
1424 | pclose(f); | |
1425 | } else { | |
1426 | fprintf(stderr, "Could not run %s\n", | |
1427 | cmd); | |
1428 | } | |
1429 | } | |
1430 | } | |
1431 | ||
1432 | static void | |
1433 | do_nologin(struct passwd *pw) | |
1434 | { | |
1435 | FILE *f = NULL; | |
1436 | char buf[1024]; | |
1437 | ||
1438 | #ifdef HAVE_LOGIN_CAP | |
1439 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1440 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1441 | _PATH_NOLOGIN), "r"); | |
1442 | #else | |
1443 | if (pw->pw_uid) | |
1444 | f = fopen(_PATH_NOLOGIN, "r"); | |
1445 | #endif | |
1446 | if (f) { | |
1447 | /* /etc/nologin exists. Print its contents and exit. */ | |
7cac2b65 | 1448 | logit("User %.100s not allowed because %s exists", |
d03f4262 | 1449 | pw->pw_name, _PATH_NOLOGIN); |
e9702f7d | 1450 | while (fgets(buf, sizeof(buf), f)) |
1451 | fputs(buf, stderr); | |
1452 | fclose(f); | |
bfe49944 | 1453 | fflush(NULL); |
e9702f7d | 1454 | exit(254); |
1455 | } | |
1456 | } | |
1457 | ||
e74dc197 | 1458 | /* |
1459 | * Chroot into a directory after checking it for safety: all path components | |
1460 | * must be root-owned directories with strict permissions. | |
1461 | */ | |
1462 | static void | |
1463 | safely_chroot(const char *path, uid_t uid) | |
1464 | { | |
1465 | const char *cp; | |
1466 | char component[MAXPATHLEN]; | |
1467 | struct stat st; | |
1468 | ||
1469 | if (*path != '/') | |
1470 | fatal("chroot path does not begin at root"); | |
1471 | if (strlen(path) >= sizeof(component)) | |
1472 | fatal("chroot path too long"); | |
1473 | ||
1474 | /* | |
1475 | * Descend the path, checking that each component is a | |
1476 | * root-owned directory with strict permissions. | |
1477 | */ | |
1478 | for (cp = path; cp != NULL;) { | |
1479 | if ((cp = strchr(cp, '/')) == NULL) | |
1480 | strlcpy(component, path, sizeof(component)); | |
1481 | else { | |
1482 | cp++; | |
1483 | memcpy(component, path, cp - path); | |
1484 | component[cp - path] = '\0'; | |
1485 | } | |
1486 | ||
1487 | debug3("%s: checking '%s'", __func__, component); | |
1488 | ||
1489 | if (stat(component, &st) != 0) | |
1490 | fatal("%s: stat(\"%s\"): %s", __func__, | |
1491 | component, strerror(errno)); | |
1492 | if (st.st_uid != 0 || (st.st_mode & 022) != 0) | |
1493 | fatal("bad ownership or modes for chroot " | |
1494 | "directory %s\"%s\"", | |
1495 | cp == NULL ? "" : "component ", component); | |
1496 | if (!S_ISDIR(st.st_mode)) | |
1497 | fatal("chroot path %s\"%s\" is not a directory", | |
1498 | cp == NULL ? "" : "component ", component); | |
1499 | ||
1500 | } | |
1501 | ||
1502 | if (chdir(path) == -1) | |
1503 | fatal("Unable to chdir to chroot path \"%s\": " | |
1504 | "%s", path, strerror(errno)); | |
1505 | if (chroot(path) == -1) | |
1506 | fatal("chroot(\"%s\"): %s", path, strerror(errno)); | |
1507 | if (chdir("/") == -1) | |
1508 | fatal("%s: chdir(/) after chroot: %s", | |
1509 | __func__, strerror(errno)); | |
1510 | verbose("Changed root directory to \"%s\"", path); | |
1511 | } | |
1512 | ||
e9702f7d | 1513 | /* Set login name, uid, gid, and groups. */ |
350391c5 | 1514 | void |
e9702f7d | 1515 | do_setusercontext(struct passwd *pw) |
1516 | { | |
e74dc197 | 1517 | char *chroot_path, *tmp; |
1518 | ||
1519 | #ifdef WITH_SELINUX | |
1520 | /* Cache selinux status for later use */ | |
1521 | (void)ssh_selinux_enabled(); | |
1522 | #endif | |
1523 | ||
bfe49944 | 1524 | #ifndef HAVE_CYGWIN |
1525 | if (getuid() == 0 || geteuid() == 0) | |
e9702f7d | 1526 | #endif /* HAVE_CYGWIN */ |
bfe49944 | 1527 | { |
1528 | ||
44a053a3 | 1529 | #ifdef HAVE_SETPCRED |
7cac2b65 | 1530 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1531 | fatal("Failed to set process credentials"); | |
44a053a3 | 1532 | #endif /* HAVE_SETPCRED */ |
e9702f7d | 1533 | #ifdef HAVE_LOGIN_CAP |
d03f4262 | 1534 | # ifdef __bsdi__ |
276b07a3 | 1535 | setpgid(0, 0); |
d03f4262 | 1536 | # endif |
540d72c3 | 1537 | # ifdef USE_PAM |
1538 | if (options.use_pam) { | |
fa0f0f45 | 1539 | do_pam_setcred(use_privsep); |
540d72c3 | 1540 | } |
1541 | # endif /* USE_PAM */ | |
e9702f7d | 1542 | if (setusercontext(lc, pw, pw->pw_uid, |
e74dc197 | 1543 | (LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETUSER))) < 0) { |
e9702f7d | 1544 | perror("unable to set user context"); |
1545 | exit(1); | |
1546 | } | |
1547 | #else | |
1548 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1549 | /* Sets login uid for accounting */ | |
1550 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1551 | error("setluid: %s", strerror(errno)); | |
1552 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1553 | ||
1554 | if (setlogin(pw->pw_name) < 0) | |
1555 | error("setlogin failed: %s", strerror(errno)); | |
1556 | if (setgid(pw->pw_gid) < 0) { | |
1557 | perror("setgid"); | |
1558 | exit(1); | |
1559 | } | |
1560 | /* Initialize the group list. */ | |
1561 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1562 | perror("initgroups"); | |
1563 | exit(1); | |
1564 | } | |
1565 | endgrent(); | |
1566 | # ifdef USE_PAM | |
1567 | /* | |
540d72c3 | 1568 | * PAM credentials may take the form of supplementary groups. |
e9702f7d | 1569 | * These will have been wiped by the above initgroups() call. |
1570 | * Reestablish them here. | |
1571 | */ | |
7cac2b65 | 1572 | if (options.use_pam) { |
fa0f0f45 | 1573 | do_pam_setcred(use_privsep); |
7cac2b65 | 1574 | } |
e9702f7d | 1575 | # endif /* USE_PAM */ |
1576 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1577 | irix_setusercontext(pw); | |
e74dc197 | 1578 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ |
276b07a3 | 1579 | # ifdef _AIX |
d03f4262 | 1580 | aix_usrinfo(pw); |
276b07a3 | 1581 | # endif /* _AIX */ |
e74dc197 | 1582 | # ifdef USE_LIBIAF |
2ce0bfe4 | 1583 | if (set_id(pw->pw_name) != 0) { |
1584 | exit(1); | |
1585 | } | |
e74dc197 | 1586 | # endif /* USE_LIBIAF */ |
1587 | #endif | |
1588 | ||
1589 | if (options.chroot_directory != NULL && | |
1590 | strcasecmp(options.chroot_directory, "none") != 0) { | |
1591 | tmp = tilde_expand_filename(options.chroot_directory, | |
1592 | pw->pw_uid); | |
1593 | chroot_path = percent_expand(tmp, "h", pw->pw_dir, | |
1594 | "u", pw->pw_name, (char *)NULL); | |
1595 | safely_chroot(chroot_path, pw->pw_uid); | |
1596 | free(tmp); | |
1597 | free(chroot_path); | |
1598 | } | |
1599 | ||
1600 | #ifdef HAVE_LOGIN_CAP | |
1601 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETUSER) < 0) { | |
1602 | perror("unable to set user context (setuser)"); | |
1603 | exit(1); | |
1604 | } | |
1605 | #else | |
e9702f7d | 1606 | /* Permanently switch to the desired uid. */ |
1607 | permanently_set_uid(pw); | |
1608 | #endif | |
1609 | } | |
bfe49944 | 1610 | |
1611 | #ifdef HAVE_CYGWIN | |
1612 | if (is_winnt) | |
1613 | #endif | |
e9702f7d | 1614 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1615 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
30460aeb | 1616 | |
1617 | #ifdef WITH_SELINUX | |
1618 | ssh_selinux_setup_exec_context(pw->pw_name); | |
1619 | #endif | |
e9702f7d | 1620 | } |
1621 | ||
540d72c3 | 1622 | static void |
1623 | do_pwchange(Session *s) | |
1624 | { | |
7e82606e | 1625 | fflush(NULL); |
540d72c3 | 1626 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1627 | if (s->ttyfd != -1) { | |
7e82606e | 1628 | fprintf(stderr, |
540d72c3 | 1629 | "You must change your password now and login again!\n"); |
dfddba3d | 1630 | #ifdef PASSWD_NEEDS_USERNAME |
1631 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1632 | (char *)NULL); | |
1633 | #else | |
540d72c3 | 1634 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
dfddba3d | 1635 | #endif |
540d72c3 | 1636 | perror("passwd"); |
1637 | } else { | |
1638 | fprintf(stderr, | |
1639 | "Password change required but no TTY available.\n"); | |
1640 | } | |
1641 | exit(1); | |
1642 | } | |
1643 | ||
350391c5 | 1644 | static void |
1645 | launch_login(struct passwd *pw, const char *hostname) | |
1646 | { | |
1647 | /* Launch login(1). */ | |
1648 | ||
44a053a3 | 1649 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
350391c5 | 1650 | #ifdef xxxLOGIN_NEEDS_TERM |
44a053a3 | 1651 | (s->term ? s->term : "unknown"), |
350391c5 | 1652 | #endif /* LOGIN_NEEDS_TERM */ |
1653 | #ifdef LOGIN_NO_ENDOPT | |
1654 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1655 | #else | |
1656 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1657 | #endif | |
1658 | ||
1659 | /* Login couldn't be executed, die. */ | |
1660 | ||
1661 | perror("login"); | |
1662 | exit(1); | |
1663 | } | |
1664 | ||
540d72c3 | 1665 | static void |
1666 | child_close_fds(void) | |
1667 | { | |
1668 | int i; | |
1669 | ||
1670 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1671 | close(packet_get_connection_in()); | |
1672 | else { | |
1673 | close(packet_get_connection_in()); | |
1674 | close(packet_get_connection_out()); | |
1675 | } | |
1676 | /* | |
1677 | * Close all descriptors related to channels. They will still remain | |
1678 | * open in the parent. | |
1679 | */ | |
1680 | /* XXX better use close-on-exec? -markus */ | |
1681 | channel_close_all(); | |
1682 | ||
1683 | /* | |
1684 | * Close any extra file descriptors. Note that there may still be | |
1685 | * descriptors left by system functions. They will be closed later. | |
1686 | */ | |
1687 | endpwent(); | |
1688 | ||
1689 | /* | |
08822d99 | 1690 | * Close any extra open file descriptors so that we don't have them |
540d72c3 | 1691 | * hanging around in clients. Note that we want to do this after |
1692 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1693 | * descriptors open. | |
1694 | */ | |
1695 | for (i = 3; i < 64; i++) | |
1696 | close(i); | |
1697 | } | |
1698 | ||
e9702f7d | 1699 | /* |
1700 | * Performs common processing for the child, such as setting up the | |
1701 | * environment, closing extra file descriptors, setting the user and group | |
1702 | * ids, and executing the command or shell. | |
1703 | */ | |
e74dc197 | 1704 | #define ARGV_MAX 10 |
e9702f7d | 1705 | void |
1706 | do_child(Session *s, const char *command) | |
1707 | { | |
1708 | extern char **environ; | |
1709 | char **env; | |
e74dc197 | 1710 | char *argv[ARGV_MAX]; |
e9702f7d | 1711 | const char *shell, *shell0, *hostname = NULL; |
1712 | struct passwd *pw = s->pw; | |
e9702f7d | 1713 | |
62eb343a | 1714 | #ifdef AFS_KRB5 |
1715 | /* Default place to look for aklog. */ | |
1716 | #ifdef AKLOG_PATH | |
1717 | #define KPROGDIR AKLOG_PATH | |
1718 | #else | |
1719 | #define KPROGDIR "/usr/bin/aklog" | |
1720 | #endif /* AKLOG_PATH */ | |
1721 | ||
1722 | struct stat st; | |
1723 | char *aklog_path; | |
1724 | #endif /* AFS_KRB5 */ | |
1725 | ||
e9702f7d | 1726 | /* remove hostkey from the child's memory */ |
1727 | destroy_sensitive_data(); | |
1728 | ||
540d72c3 | 1729 | /* Force a password change */ |
1730 | if (s->authctxt->force_pwchange) { | |
1731 | do_setusercontext(pw); | |
1732 | child_close_fds(); | |
1733 | do_pwchange(s); | |
1734 | exit(1); | |
1735 | } | |
1736 | ||
e9702f7d | 1737 | /* login(1) is only called if we execute the login shell */ |
1738 | if (options.use_login && command != NULL) | |
1739 | options.use_login = 0; | |
1740 | ||
d03f4262 | 1741 | #ifdef _UNICOS |
1742 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1743 | #endif /* _UNICOS */ | |
1744 | ||
e9702f7d | 1745 | /* |
1746 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1747 | * switch, so we let login(1) to this for us. | |
1748 | */ | |
1749 | if (!options.use_login) { | |
1750 | #ifdef HAVE_OSF_SIA | |
bfe49944 | 1751 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
e9702f7d | 1752 | if (!check_quietlogin(s, command)) |
1753 | do_motd(); | |
1754 | #else /* HAVE_OSF_SIA */ | |
08822d99 | 1755 | /* When PAM is enabled we rely on it to do the nologin check */ |
1756 | if (!options.use_pam) | |
1757 | do_nologin(pw); | |
e9702f7d | 1758 | do_setusercontext(pw); |
7e82606e | 1759 | /* |
1760 | * PAM session modules in do_setusercontext may have | |
1761 | * generated messages, so if this in an interactive | |
1762 | * login then display them too. | |
1763 | */ | |
dfddba3d | 1764 | if (!check_quietlogin(s, command)) |
7e82606e | 1765 | display_loginmsg(); |
e9702f7d | 1766 | #endif /* HAVE_OSF_SIA */ |
1767 | } | |
1768 | ||
dfddba3d | 1769 | #ifdef USE_PAM |
8b32eddc | 1770 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1771 | debug3("PAM session not opened, exiting"); | |
dfddba3d | 1772 | display_loginmsg(); |
1773 | exit(254); | |
1774 | } | |
1775 | #endif | |
1776 | ||
e9702f7d | 1777 | /* |
1778 | * Get the shell from the password data. An empty shell field is | |
1779 | * legal, and means /bin/sh. | |
1780 | */ | |
1781 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
bfe49944 | 1782 | |
1783 | /* | |
1784 | * Make sure $SHELL points to the shell from the password file, | |
1785 | * even if shell is overridden from login.conf | |
1786 | */ | |
1787 | env = do_setup_env(s, shell); | |
1788 | ||
e9702f7d | 1789 | #ifdef HAVE_LOGIN_CAP |
1790 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1791 | #endif | |
1792 | ||
3c0ef626 | 1793 | /* we have to stash the hostname before we close our socket. */ |
1794 | if (options.use_login) | |
1795 | hostname = get_remote_name_or_ip(utmp_len, | |
7cac2b65 | 1796 | options.use_dns); |
3c0ef626 | 1797 | /* |
1798 | * Close the connection descriptors; note that this is the child, and | |
1799 | * the server will still have the socket open, and it is important | |
1800 | * that we do not shutdown it. Note that the descriptors cannot be | |
1801 | * closed before building the environment, as we call | |
1802 | * get_remote_ipaddr there. | |
1803 | */ | |
540d72c3 | 1804 | child_close_fds(); |
3c0ef626 | 1805 | |
1806 | /* | |
540d72c3 | 1807 | * Must take new environment into use so that .ssh/rc, |
1808 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
3c0ef626 | 1809 | */ |
540d72c3 | 1810 | environ = env; |
3c0ef626 | 1811 | |
540d72c3 | 1812 | #if defined(KRB5) && defined(USE_AFS) |
3c0ef626 | 1813 | /* |
540d72c3 | 1814 | * At this point, we check to see if AFS is active and if we have |
1815 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1816 | * if we can (and need to) extend the ticket into an AFS token. If | |
1817 | * we don't do this, we run into potential problems if the user's | |
1818 | * home directory is in AFS and it's not world-readable. | |
3c0ef626 | 1819 | */ |
3c0ef626 | 1820 | |
540d72c3 | 1821 | if (options.kerberos_get_afs_token && k_hasafs() && |
2ce0bfe4 | 1822 | (s->authctxt->krb5_ctx != NULL)) { |
540d72c3 | 1823 | char cell[64]; |
1824 | ||
1825 | debug("Getting AFS token"); | |
1826 | ||
1827 | k_setpag(); | |
1828 | ||
1829 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1830 | krb5_afslog(s->authctxt->krb5_ctx, | |
1831 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1832 | ||
1833 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1834 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1835 | } | |
1836 | #endif | |
3c0ef626 | 1837 | |
62eb343a | 1838 | #ifdef AFS_KRB5 |
1839 | ||
1840 | /* User has authenticated, and if a ticket was going to be | |
1841 | * passed we would have it. KRB5CCNAME should already be set. | |
1842 | * Now try to get an AFS token using aklog. | |
1843 | */ | |
1844 | if (k_hasafs()) { /* Do we have AFS? */ | |
1845 | ||
1846 | aklog_path = xstrdup(KPROGDIR); | |
1847 | ||
1848 | /* | |
1849 | * Make sure it exists before we try to run it | |
1850 | */ | |
1851 | if (stat(aklog_path, &st) == 0) { | |
1852 | debug("Running %s to get afs token.",aklog_path); | |
1853 | system(aklog_path); | |
1854 | } else { | |
1855 | debug("%s does not exist.",aklog_path); | |
1856 | } | |
1857 | ||
1858 | xfree(aklog_path); | |
1859 | } | |
1860 | #endif /* AFS_KRB5 */ | |
1861 | ||
75be3237 | 1862 | #ifdef SESSION_HOOKS |
1863 | if (options.session_hooks_allow && | |
1864 | options.session_hooks_startup_cmd) | |
1865 | { | |
1866 | execute_session_hook(options.session_hooks_startup_cmd, | |
1867 | s->authctxt, | |
1868 | /* startup = */ 1, | |
1869 | options.session_hooks_shutdown_cmd != NULL); | |
1870 | } | |
1871 | #endif | |
3c0ef626 | 1872 | |
08822d99 | 1873 | /* Change current directory to the user's home directory. */ |
3c0ef626 | 1874 | if (chdir(pw->pw_dir) < 0) { |
1875 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1876 | pw->pw_dir, strerror(errno)); | |
1877 | #ifdef HAVE_LOGIN_CAP | |
1878 | if (login_getcapbool(lc, "requirehome", 0)) | |
1879 | exit(1); | |
1880 | #endif | |
1881 | } | |
1882 | ||
e74dc197 | 1883 | closefrom(STDERR_FILENO + 1); |
1884 | ||
e9702f7d | 1885 | if (!options.use_login) |
1886 | do_rc_files(s, shell); | |
3c0ef626 | 1887 | |
1888 | /* restore SIGPIPE for child */ | |
30460aeb | 1889 | signal(SIGPIPE, SIG_DFL); |
3c0ef626 | 1890 | |
e74dc197 | 1891 | if (s->is_subsystem == SUBSYSTEM_INT_SFTP) { |
1892 | extern int optind, optreset; | |
1893 | int i; | |
1894 | char *p, *args; | |
1895 | ||
1896 | setproctitle("%s@internal-sftp-server", s->pw->pw_name); | |
1897 | args = strdup(command ? command : "sftp-server"); | |
1898 | for (i = 0, (p = strtok(args, " ")); p; (p = strtok(NULL, " "))) | |
1899 | if (i < ARGV_MAX - 1) | |
1900 | argv[i++] = p; | |
1901 | argv[i] = NULL; | |
1902 | optind = optreset = 1; | |
1903 | __progname = argv[0]; | |
1904 | exit(sftp_server_main(i, argv, s->pw)); | |
1905 | } | |
1906 | ||
e9702f7d | 1907 | if (options.use_login) { |
350391c5 | 1908 | launch_login(pw, hostname); |
1909 | /* NEVERREACHED */ | |
e9702f7d | 1910 | } |
1911 | ||
1912 | /* Get the last component of the shell name. */ | |
1913 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1914 | shell0++; | |
1915 | else | |
1916 | shell0 = shell; | |
1917 | ||
3c0ef626 | 1918 | /* |
1919 | * If we have no command, execute the shell. In this case, the shell | |
1920 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1921 | * this is a login shell. | |
1922 | */ | |
1923 | if (!command) { | |
e9702f7d | 1924 | char argv0[256]; |
3c0ef626 | 1925 | |
e9702f7d | 1926 | /* Start the shell. Set initial character to '-'. */ |
1927 | argv0[0] = '-'; | |
3c0ef626 | 1928 | |
e9702f7d | 1929 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1930 | >= sizeof(argv0) - 1) { | |
1931 | errno = EINVAL; | |
3c0ef626 | 1932 | perror(shell); |
1933 | exit(1); | |
e9702f7d | 1934 | } |
3c0ef626 | 1935 | |
e9702f7d | 1936 | /* Execute the shell. */ |
1937 | argv[0] = argv0; | |
1938 | argv[1] = NULL; | |
5ab1e3bd | 1939 | execve(shell, argv, environ); |
3c0ef626 | 1940 | |
e9702f7d | 1941 | /* Executing the shell failed. */ |
1942 | perror(shell); | |
1943 | exit(1); | |
3c0ef626 | 1944 | } |
1945 | /* | |
1946 | * Execute the command using the user's shell. This uses the -c | |
1947 | * option to execute the command. | |
1948 | */ | |
e9702f7d | 1949 | argv[0] = (char *) shell0; |
3c0ef626 | 1950 | argv[1] = "-c"; |
1951 | argv[2] = (char *) command; | |
1952 | argv[3] = NULL; | |
5ab1e3bd | 1953 | execve(shell, argv, environ); |
3c0ef626 | 1954 | perror(shell); |
1955 | exit(1); | |
1956 | } | |
1957 | ||
1958 | Session * | |
1959 | session_new(void) | |
1960 | { | |
1961 | int i; | |
1962 | static int did_init = 0; | |
1963 | if (!did_init) { | |
1964 | debug("session_new: init"); | |
e9702f7d | 1965 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1966 | sessions[i].used = 0; |
1967 | } | |
1968 | did_init = 1; | |
1969 | } | |
e9702f7d | 1970 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1971 | Session *s = &sessions[i]; |
1972 | if (! s->used) { | |
1973 | memset(s, 0, sizeof(*s)); | |
1974 | s->chanid = -1; | |
1975 | s->ptyfd = -1; | |
1976 | s->ttyfd = -1; | |
1977 | s->used = 1; | |
1978 | s->self = i; | |
2ce0bfe4 | 1979 | s->x11_chanids = NULL; |
3c0ef626 | 1980 | debug("session_new: session %d", i); |
1981 | return s; | |
1982 | } | |
1983 | } | |
1984 | return NULL; | |
1985 | } | |
1986 | ||
1987 | static void | |
1988 | session_dump(void) | |
1989 | { | |
1990 | int i; | |
e9702f7d | 1991 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1992 | Session *s = &sessions[i]; |
44a053a3 | 1993 | debug("dump: used %d session %d %p channel %d pid %ld", |
3c0ef626 | 1994 | s->used, |
1995 | s->self, | |
1996 | s, | |
1997 | s->chanid, | |
44a053a3 | 1998 | (long)s->pid); |
3c0ef626 | 1999 | } |
2000 | } | |
2001 | ||
2002 | int | |
2003 | session_open(Authctxt *authctxt, int chanid) | |
2004 | { | |
2005 | Session *s = session_new(); | |
2006 | debug("session_open: channel %d", chanid); | |
2007 | if (s == NULL) { | |
2008 | error("no more sessions"); | |
2009 | return 0; | |
2010 | } | |
2011 | s->authctxt = authctxt; | |
2012 | s->pw = authctxt->pw; | |
540d72c3 | 2013 | if (s->pw == NULL || !authctxt->valid) |
3c0ef626 | 2014 | fatal("no user for session %d", s->self); |
2015 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
2016 | s->chanid = chanid; | |
2017 | return 1; | |
2018 | } | |
2019 | ||
350391c5 | 2020 | Session * |
2021 | session_by_tty(char *tty) | |
2022 | { | |
2023 | int i; | |
2024 | for (i = 0; i < MAX_SESSIONS; i++) { | |
2025 | Session *s = &sessions[i]; | |
2026 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
2027 | debug("session_by_tty: session %d tty %s", i, tty); | |
2028 | return s; | |
2029 | } | |
2030 | } | |
2031 | debug("session_by_tty: unknown tty %.100s", tty); | |
2032 | session_dump(); | |
2033 | return NULL; | |
2034 | } | |
2035 | ||
3c0ef626 | 2036 | static Session * |
2037 | session_by_channel(int id) | |
2038 | { | |
2039 | int i; | |
e9702f7d | 2040 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2041 | Session *s = &sessions[i]; |
2042 | if (s->used && s->chanid == id) { | |
2043 | debug("session_by_channel: session %d channel %d", i, id); | |
2044 | return s; | |
2045 | } | |
2046 | } | |
2047 | debug("session_by_channel: unknown channel %d", id); | |
2048 | session_dump(); | |
2049 | return NULL; | |
2050 | } | |
2051 | ||
2ce0bfe4 | 2052 | static Session * |
2053 | session_by_x11_channel(int id) | |
2054 | { | |
2055 | int i, j; | |
2056 | ||
2057 | for (i = 0; i < MAX_SESSIONS; i++) { | |
2058 | Session *s = &sessions[i]; | |
2059 | ||
2060 | if (s->x11_chanids == NULL || !s->used) | |
2061 | continue; | |
2062 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
2063 | if (s->x11_chanids[j] == id) { | |
2064 | debug("session_by_x11_channel: session %d " | |
2065 | "channel %d", s->self, id); | |
2066 | return s; | |
2067 | } | |
2068 | } | |
2069 | } | |
2070 | debug("session_by_x11_channel: unknown channel %d", id); | |
2071 | session_dump(); | |
2072 | return NULL; | |
2073 | } | |
2074 | ||
3c0ef626 | 2075 | static Session * |
2076 | session_by_pid(pid_t pid) | |
2077 | { | |
2078 | int i; | |
44a053a3 | 2079 | debug("session_by_pid: pid %ld", (long)pid); |
e9702f7d | 2080 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2081 | Session *s = &sessions[i]; |
2082 | if (s->used && s->pid == pid) | |
2083 | return s; | |
2084 | } | |
44a053a3 | 2085 | error("session_by_pid: unknown pid %ld", (long)pid); |
3c0ef626 | 2086 | session_dump(); |
2087 | return NULL; | |
2088 | } | |
2089 | ||
2090 | static int | |
2091 | session_window_change_req(Session *s) | |
2092 | { | |
2093 | s->col = packet_get_int(); | |
2094 | s->row = packet_get_int(); | |
2095 | s->xpixel = packet_get_int(); | |
2096 | s->ypixel = packet_get_int(); | |
e9702f7d | 2097 | packet_check_eom(); |
3c0ef626 | 2098 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
2099 | return 1; | |
2100 | } | |
2101 | ||
2102 | static int | |
2103 | session_pty_req(Session *s) | |
2104 | { | |
2105 | u_int len; | |
2106 | int n_bytes; | |
2107 | ||
2108 | if (no_pty_flag) { | |
2109 | debug("Allocating a pty not permitted for this authentication."); | |
2110 | return 0; | |
2111 | } | |
2112 | if (s->ttyfd != -1) { | |
2113 | packet_disconnect("Protocol error: you already have a pty."); | |
2114 | return 0; | |
2115 | } | |
2116 | ||
2117 | s->term = packet_get_string(&len); | |
2118 | ||
2119 | if (compat20) { | |
2120 | s->col = packet_get_int(); | |
2121 | s->row = packet_get_int(); | |
2122 | } else { | |
2123 | s->row = packet_get_int(); | |
2124 | s->col = packet_get_int(); | |
2125 | } | |
2126 | s->xpixel = packet_get_int(); | |
2127 | s->ypixel = packet_get_int(); | |
2128 | ||
2129 | if (strcmp(s->term, "") == 0) { | |
2130 | xfree(s->term); | |
2131 | s->term = NULL; | |
2132 | } | |
2133 | ||
2134 | /* Allocate a pty and open it. */ | |
2135 | debug("Allocating pty."); | |
350391c5 | 2136 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
3c0ef626 | 2137 | if (s->term) |
2138 | xfree(s->term); | |
2139 | s->term = NULL; | |
2140 | s->ptyfd = -1; | |
2141 | s->ttyfd = -1; | |
2142 | error("session_pty_req: session %d alloc failed", s->self); | |
2143 | return 0; | |
2144 | } | |
2145 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
2146 | ||
2147 | /* for SSH1 the tty modes length is not given */ | |
2148 | if (!compat20) | |
2149 | n_bytes = packet_remaining(); | |
2150 | tty_parse_modes(s->ttyfd, &n_bytes); | |
2151 | ||
350391c5 | 2152 | if (!use_privsep) |
2153 | pty_setowner(s->pw, s->tty); | |
3c0ef626 | 2154 | |
2155 | /* Set window size from the packet. */ | |
2156 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
2157 | ||
e9702f7d | 2158 | packet_check_eom(); |
3c0ef626 | 2159 | session_proctitle(s); |
2160 | return 1; | |
2161 | } | |
2162 | ||
2163 | static int | |
2164 | session_subsystem_req(Session *s) | |
2165 | { | |
2166 | struct stat st; | |
2167 | u_int len; | |
2168 | int success = 0; | |
30460aeb | 2169 | char *prog, *cmd, *subsys = packet_get_string(&len); |
2ce0bfe4 | 2170 | u_int i; |
3c0ef626 | 2171 | |
e9702f7d | 2172 | packet_check_eom(); |
7cac2b65 | 2173 | logit("subsystem request for %.100s", subsys); |
3c0ef626 | 2174 | |
2175 | for (i = 0; i < options.num_subsystems; i++) { | |
2176 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { | |
30460aeb | 2177 | prog = options.subsystem_command[i]; |
2178 | cmd = options.subsystem_args[i]; | |
e74dc197 | 2179 | if (!strcmp(INTERNAL_SFTP_NAME, prog)) { |
2180 | s->is_subsystem = SUBSYSTEM_INT_SFTP; | |
2181 | } else if (stat(prog, &st) < 0) { | |
30460aeb | 2182 | error("subsystem: cannot stat %s: %s", prog, |
3c0ef626 | 2183 | strerror(errno)); |
2184 | break; | |
e74dc197 | 2185 | } else { |
2186 | s->is_subsystem = SUBSYSTEM_EXT; | |
3c0ef626 | 2187 | } |
2188 | debug("subsystem: exec() %s", cmd); | |
3c0ef626 | 2189 | do_exec(s, cmd); |
2190 | success = 1; | |
e9702f7d | 2191 | break; |
3c0ef626 | 2192 | } |
2193 | } | |
2194 | ||
2195 | if (!success) | |
7cac2b65 | 2196 | logit("subsystem request for %.100s failed, subsystem not found", |
3c0ef626 | 2197 | subsys); |
2198 | ||
2199 | xfree(subsys); | |
2200 | return success; | |
2201 | } | |
2202 | ||
2203 | static int | |
2204 | session_x11_req(Session *s) | |
2205 | { | |
2206 | int success; | |
2207 | ||
2ce0bfe4 | 2208 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
2209 | error("session_x11_req: session %d: " | |
08822d99 | 2210 | "x11 forwarding already active", s->self); |
2ce0bfe4 | 2211 | return 0; |
2212 | } | |
3c0ef626 | 2213 | s->single_connection = packet_get_char(); |
2214 | s->auth_proto = packet_get_string(NULL); | |
2215 | s->auth_data = packet_get_string(NULL); | |
2216 | s->screen = packet_get_int(); | |
e9702f7d | 2217 | packet_check_eom(); |
3c0ef626 | 2218 | |
2219 | success = session_setup_x11fwd(s); | |
2220 | if (!success) { | |
2221 | xfree(s->auth_proto); | |
2222 | xfree(s->auth_data); | |
2223 | s->auth_proto = NULL; | |
2224 | s->auth_data = NULL; | |
2225 | } | |
2226 | return success; | |
2227 | } | |
2228 | ||
2229 | static int | |
2230 | session_shell_req(Session *s) | |
2231 | { | |
e9702f7d | 2232 | packet_check_eom(); |
3c0ef626 | 2233 | do_exec(s, NULL); |
2234 | return 1; | |
2235 | } | |
2236 | ||
2237 | static int | |
2238 | session_exec_req(Session *s) | |
2239 | { | |
2240 | u_int len; | |
2241 | char *command = packet_get_string(&len); | |
e9702f7d | 2242 | packet_check_eom(); |
3c0ef626 | 2243 | do_exec(s, command); |
2244 | xfree(command); | |
2245 | return 1; | |
2246 | } | |
2247 | ||
7cac2b65 | 2248 | static int |
2249 | session_break_req(Session *s) | |
2250 | { | |
7cac2b65 | 2251 | |
7e82606e | 2252 | packet_get_int(); /* ignored */ |
7cac2b65 | 2253 | packet_check_eom(); |
2254 | ||
2255 | if (s->ttyfd == -1 || | |
2256 | tcsendbreak(s->ttyfd, 0) < 0) | |
2257 | return 0; | |
2258 | return 1; | |
2259 | } | |
2260 | ||
7e82606e | 2261 | static int |
2262 | session_env_req(Session *s) | |
2263 | { | |
2264 | char *name, *val; | |
2265 | u_int name_len, val_len, i; | |
2266 | ||
2267 | name = packet_get_string(&name_len); | |
2268 | val = packet_get_string(&val_len); | |
2269 | packet_check_eom(); | |
2270 | ||
2271 | /* Don't set too many environment variables */ | |
2272 | if (s->num_env > 128) { | |
2273 | debug2("Ignoring env request %s: too many env vars", name); | |
2274 | goto fail; | |
2275 | } | |
2276 | ||
2277 | for (i = 0; i < options.num_accept_env; i++) { | |
2278 | if (match_pattern(name, options.accept_env[i])) { | |
2279 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
30460aeb | 2280 | s->env = xrealloc(s->env, s->num_env + 1, |
2281 | sizeof(*s->env)); | |
7e82606e | 2282 | s->env[s->num_env].name = name; |
2283 | s->env[s->num_env].val = val; | |
2284 | s->num_env++; | |
2285 | return (1); | |
2286 | } | |
2287 | } | |
2288 | debug2("Ignoring env request %s: disallowed name", name); | |
2289 | ||
2290 | fail: | |
2291 | xfree(name); | |
2292 | xfree(val); | |
2293 | return (0); | |
2294 | } | |
2295 | ||
3c0ef626 | 2296 | static int |
2297 | session_auth_agent_req(Session *s) | |
2298 | { | |
2299 | static int called = 0; | |
e9702f7d | 2300 | packet_check_eom(); |
3c0ef626 | 2301 | if (no_agent_forwarding_flag) { |
2302 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
2303 | return 0; | |
2304 | } | |
2305 | if (called) { | |
2306 | return 0; | |
2307 | } else { | |
2308 | called = 1; | |
2309 | return auth_input_request_forwarding(s->pw); | |
2310 | } | |
2311 | } | |
2312 | ||
e9702f7d | 2313 | int |
2314 | session_input_channel_req(Channel *c, const char *rtype) | |
3c0ef626 | 2315 | { |
3c0ef626 | 2316 | int success = 0; |
3c0ef626 | 2317 | Session *s; |
3c0ef626 | 2318 | |
e9702f7d | 2319 | if ((s = session_by_channel(c->self)) == NULL) { |
7cac2b65 | 2320 | logit("session_input_channel_req: no session %d req %.100s", |
e9702f7d | 2321 | c->self, rtype); |
2322 | return 0; | |
2323 | } | |
2324 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
3c0ef626 | 2325 | |
2326 | /* | |
2327 | * a session is in LARVAL state until a shell, a command | |
2328 | * or a subsystem is executed | |
2329 | */ | |
2330 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2331 | if (strcmp(rtype, "shell") == 0) { | |
2332 | success = session_shell_req(s); | |
2333 | } else if (strcmp(rtype, "exec") == 0) { | |
2334 | success = session_exec_req(s); | |
2335 | } else if (strcmp(rtype, "pty-req") == 0) { | |
0b90ac93 | 2336 | success = session_pty_req(s); |
3c0ef626 | 2337 | } else if (strcmp(rtype, "x11-req") == 0) { |
2338 | success = session_x11_req(s); | |
2339 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { | |
2340 | success = session_auth_agent_req(s); | |
2341 | } else if (strcmp(rtype, "subsystem") == 0) { | |
2342 | success = session_subsystem_req(s); | |
7e82606e | 2343 | } else if (strcmp(rtype, "env") == 0) { |
2344 | success = session_env_req(s); | |
3c0ef626 | 2345 | } |
2346 | } | |
2347 | if (strcmp(rtype, "window-change") == 0) { | |
2348 | success = session_window_change_req(s); | |
7e82606e | 2349 | } else if (strcmp(rtype, "break") == 0) { |
2350 | success = session_break_req(s); | |
3c0ef626 | 2351 | } |
7e82606e | 2352 | |
e9702f7d | 2353 | return success; |
3c0ef626 | 2354 | } |
2355 | ||
2356 | void | |
2357 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2358 | { | |
2359 | if (!compat20) | |
2360 | fatal("session_set_fds: called for proto != 2.0"); | |
2361 | /* | |
2362 | * now that have a child and a pipe to the child, | |
2363 | * we can activate our channel and register the fd's | |
2364 | */ | |
2365 | if (s->chanid == -1) | |
2366 | fatal("no channel for session %d", s->self); | |
a7213e65 | 2367 | if(options.hpn_disabled) |
6df46d40 | 2368 | channel_set_fds(s->chanid, |
2369 | fdout, fdin, fderr, | |
2370 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
2371 | 1, | |
2372 | CHAN_SES_WINDOW_DEFAULT); | |
a7213e65 | 2373 | else |
2374 | channel_set_fds(s->chanid, | |
2375 | fdout, fdin, fderr, | |
2376 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
2377 | 1, | |
2378 | options.hpn_buffer_size); | |
3c0ef626 | 2379 | } |
2380 | ||
2381 | /* | |
2382 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2383 | * (e.g., due to a dropped connection). | |
2384 | */ | |
350391c5 | 2385 | void |
540d72c3 | 2386 | session_pty_cleanup2(Session *s) |
3c0ef626 | 2387 | { |
3c0ef626 | 2388 | if (s == NULL) { |
2389 | error("session_pty_cleanup: no session"); | |
2390 | return; | |
2391 | } | |
2392 | if (s->ttyfd == -1) | |
2393 | return; | |
2394 | ||
2395 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); | |
2396 | ||
2397 | /* Record that the user has logged out. */ | |
2398 | if (s->pid != 0) | |
e9702f7d | 2399 | record_logout(s->pid, s->tty, s->pw->pw_name); |
3c0ef626 | 2400 | |
2401 | /* Release the pseudo-tty. */ | |
350391c5 | 2402 | if (getuid() == 0) |
2403 | pty_release(s->tty); | |
3c0ef626 | 2404 | |
2405 | /* | |
2406 | * Close the server side of the socket pairs. We must do this after | |
2407 | * the pty cleanup, so that another process doesn't get this pty | |
2408 | * while we're still cleaning up. | |
2409 | */ | |
2410 | if (close(s->ptymaster) < 0) | |
350391c5 | 2411 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
3c0ef626 | 2412 | |
2413 | /* unlink pty from session */ | |
2414 | s->ttyfd = -1; | |
2415 | } | |
2416 | ||
350391c5 | 2417 | void |
540d72c3 | 2418 | session_pty_cleanup(Session *s) |
350391c5 | 2419 | { |
540d72c3 | 2420 | PRIVSEP(session_pty_cleanup2(s)); |
350391c5 | 2421 | } |
2422 | ||
d03f4262 | 2423 | static char * |
2424 | sig2name(int sig) | |
2425 | { | |
2426 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2427 | SSH_SIG(ABRT); | |
2428 | SSH_SIG(ALRM); | |
2429 | SSH_SIG(FPE); | |
2430 | SSH_SIG(HUP); | |
2431 | SSH_SIG(ILL); | |
2432 | SSH_SIG(INT); | |
2433 | SSH_SIG(KILL); | |
2434 | SSH_SIG(PIPE); | |
2435 | SSH_SIG(QUIT); | |
2436 | SSH_SIG(SEGV); | |
2437 | SSH_SIG(TERM); | |
2438 | SSH_SIG(USR1); | |
2439 | SSH_SIG(USR2); | |
2440 | #undef SSH_SIG | |
2441 | return "SIG@openssh.com"; | |
2442 | } | |
2443 | ||
2ce0bfe4 | 2444 | static void |
2445 | session_close_x11(int id) | |
2446 | { | |
2447 | Channel *c; | |
2448 | ||
08822d99 | 2449 | if ((c = channel_by_id(id)) == NULL) { |
2ce0bfe4 | 2450 | debug("session_close_x11: x11 channel %d missing", id); |
2451 | } else { | |
2452 | /* Detach X11 listener */ | |
2453 | debug("session_close_x11: detach x11 channel %d", id); | |
2454 | channel_cancel_cleanup(id); | |
2455 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2456 | chan_mark_dead(c); | |
2457 | } | |
2458 | } | |
2459 | ||
2460 | static void | |
2461 | session_close_single_x11(int id, void *arg) | |
2462 | { | |
2463 | Session *s; | |
2464 | u_int i; | |
2465 | ||
2466 | debug3("session_close_single_x11: channel %d", id); | |
2467 | channel_cancel_cleanup(id); | |
0b90ac93 | 2468 | if ((s = session_by_x11_channel(id)) == NULL) |
2ce0bfe4 | 2469 | fatal("session_close_single_x11: no x11 channel %d", id); |
2470 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2471 | debug("session_close_single_x11: session %d: " | |
2472 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2473 | /* | |
2474 | * The channel "id" is already closing, but make sure we | |
2475 | * close all of its siblings. | |
2476 | */ | |
2477 | if (s->x11_chanids[i] != id) | |
2478 | session_close_x11(s->x11_chanids[i]); | |
2479 | } | |
2480 | xfree(s->x11_chanids); | |
2481 | s->x11_chanids = NULL; | |
2482 | if (s->display) { | |
2483 | xfree(s->display); | |
2484 | s->display = NULL; | |
2485 | } | |
2486 | if (s->auth_proto) { | |
2487 | xfree(s->auth_proto); | |
2488 | s->auth_proto = NULL; | |
2489 | } | |
2490 | if (s->auth_data) { | |
2491 | xfree(s->auth_data); | |
2492 | s->auth_data = NULL; | |
2493 | } | |
2494 | if (s->auth_display) { | |
2495 | xfree(s->auth_display); | |
2496 | s->auth_display = NULL; | |
2497 | } | |
2498 | } | |
2499 | ||
3c0ef626 | 2500 | static void |
2501 | session_exit_message(Session *s, int status) | |
2502 | { | |
2503 | Channel *c; | |
e9702f7d | 2504 | |
2505 | if ((c = channel_lookup(s->chanid)) == NULL) | |
3c0ef626 | 2506 | fatal("session_exit_message: session %d: no channel %d", |
2507 | s->self, s->chanid); | |
44a053a3 | 2508 | debug("session_exit_message: session %d channel %d pid %ld", |
2509 | s->self, s->chanid, (long)s->pid); | |
3c0ef626 | 2510 | |
2511 | if (WIFEXITED(status)) { | |
e9702f7d | 2512 | channel_request_start(s->chanid, "exit-status", 0); |
3c0ef626 | 2513 | packet_put_int(WEXITSTATUS(status)); |
2514 | packet_send(); | |
2515 | } else if (WIFSIGNALED(status)) { | |
e9702f7d | 2516 | channel_request_start(s->chanid, "exit-signal", 0); |
d03f4262 | 2517 | packet_put_cstring(sig2name(WTERMSIG(status))); |
3c0ef626 | 2518 | #ifdef WCOREDUMP |
e74dc197 | 2519 | packet_put_char(WCOREDUMP(status)? 1 : 0); |
3c0ef626 | 2520 | #else /* WCOREDUMP */ |
2521 | packet_put_char(0); | |
2522 | #endif /* WCOREDUMP */ | |
2523 | packet_put_cstring(""); | |
2524 | packet_put_cstring(""); | |
2525 | packet_send(); | |
2526 | } else { | |
2527 | /* Some weird exit cause. Just exit. */ | |
2528 | packet_disconnect("wait returned status %04x.", status); | |
2529 | } | |
2530 | ||
2531 | /* disconnect channel */ | |
2532 | debug("session_exit_message: release channel %d", s->chanid); | |
08822d99 | 2533 | |
2534 | /* | |
2535 | * Adjust cleanup callback attachment to send close messages when | |
30460aeb | 2536 | * the channel gets EOF. The session will be then be closed |
08822d99 | 2537 | * by session_close_by_channel when the childs close their fds. |
2538 | */ | |
2539 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2540 | ||
3c0ef626 | 2541 | /* |
2542 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2543 | * interested in data we write. | |
2544 | * Note that we must not call 'chan_read_failed', since there could | |
2545 | * be some more data waiting in the pipe. | |
2546 | */ | |
2547 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2548 | chan_write_failed(c); | |
3c0ef626 | 2549 | } |
2550 | ||
350391c5 | 2551 | void |
3c0ef626 | 2552 | session_close(Session *s) |
2553 | { | |
2ce0bfe4 | 2554 | u_int i; |
7e82606e | 2555 | |
44a053a3 | 2556 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
540d72c3 | 2557 | if (s->ttyfd != -1) |
3c0ef626 | 2558 | session_pty_cleanup(s); |
3c0ef626 | 2559 | if (s->term) |
2560 | xfree(s->term); | |
2561 | if (s->display) | |
2562 | xfree(s->display); | |
2ce0bfe4 | 2563 | if (s->x11_chanids) |
2564 | xfree(s->x11_chanids); | |
e9702f7d | 2565 | if (s->auth_display) |
2566 | xfree(s->auth_display); | |
3c0ef626 | 2567 | if (s->auth_data) |
2568 | xfree(s->auth_data); | |
2569 | if (s->auth_proto) | |
2570 | xfree(s->auth_proto); | |
2571 | s->used = 0; | |
30460aeb | 2572 | if (s->env != NULL) { |
2573 | for (i = 0; i < s->num_env; i++) { | |
2574 | xfree(s->env[i].name); | |
2575 | xfree(s->env[i].val); | |
2576 | } | |
7e82606e | 2577 | xfree(s->env); |
30460aeb | 2578 | } |
3c0ef626 | 2579 | session_proctitle(s); |
2580 | } | |
2581 | ||
2582 | void | |
2583 | session_close_by_pid(pid_t pid, int status) | |
2584 | { | |
2585 | Session *s = session_by_pid(pid); | |
2586 | if (s == NULL) { | |
44a053a3 | 2587 | debug("session_close_by_pid: no session for pid %ld", |
2588 | (long)pid); | |
3c0ef626 | 2589 | return; |
2590 | } | |
2591 | if (s->chanid != -1) | |
2592 | session_exit_message(s, status); | |
08822d99 | 2593 | if (s->ttyfd != -1) |
2594 | session_pty_cleanup(s); | |
4b6dae8f | 2595 | s->pid = 0; |
3c0ef626 | 2596 | } |
2597 | ||
2598 | /* | |
2599 | * this is called when a channel dies before | |
2600 | * the session 'child' itself dies | |
2601 | */ | |
2602 | void | |
2603 | session_close_by_channel(int id, void *arg) | |
2604 | { | |
2605 | Session *s = session_by_channel(id); | |
08822d99 | 2606 | u_int i; |
2ce0bfe4 | 2607 | |
3c0ef626 | 2608 | if (s == NULL) { |
2609 | debug("session_close_by_channel: no session for id %d", id); | |
2610 | return; | |
2611 | } | |
44a053a3 | 2612 | debug("session_close_by_channel: channel %d child %ld", |
2613 | id, (long)s->pid); | |
3c0ef626 | 2614 | if (s->pid != 0) { |
2615 | debug("session_close_by_channel: channel %d: has child", id); | |
2616 | /* | |
2617 | * delay detach of session, but release pty, since | |
2618 | * the fd's to the child are already closed | |
2619 | */ | |
540d72c3 | 2620 | if (s->ttyfd != -1) |
3c0ef626 | 2621 | session_pty_cleanup(s); |
3c0ef626 | 2622 | return; |
2623 | } | |
2624 | /* detach by removing callback */ | |
2625 | channel_cancel_cleanup(s->chanid); | |
08822d99 | 2626 | |
2627 | /* Close any X11 listeners associated with this session */ | |
2628 | if (s->x11_chanids != NULL) { | |
2629 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2630 | session_close_x11(s->x11_chanids[i]); | |
2631 | s->x11_chanids[i] = -1; | |
2632 | } | |
2633 | } | |
2634 | ||
3c0ef626 | 2635 | s->chanid = -1; |
2636 | session_close(s); | |
2637 | } | |
2638 | ||
2639 | void | |
350391c5 | 2640 | session_destroy_all(void (*closefunc)(Session *)) |
3c0ef626 | 2641 | { |
2642 | int i; | |
e9702f7d | 2643 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2644 | Session *s = &sessions[i]; |
350391c5 | 2645 | if (s->used) { |
2646 | if (closefunc != NULL) | |
2647 | closefunc(s); | |
2648 | else | |
2649 | session_close(s); | |
2650 | } | |
3c0ef626 | 2651 | } |
2652 | } | |
2653 | ||
2654 | static char * | |
2655 | session_tty_list(void) | |
2656 | { | |
2657 | static char buf[1024]; | |
2658 | int i; | |
bfe49944 | 2659 | char *cp; |
2660 | ||
3c0ef626 | 2661 | buf[0] = '\0'; |
e9702f7d | 2662 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2663 | Session *s = &sessions[i]; |
2664 | if (s->used && s->ttyfd != -1) { | |
540d72c3 | 2665 | |
bfe49944 | 2666 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2667 | cp = strrchr(s->tty, '/'); | |
2668 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2669 | } else | |
2670 | cp = s->tty + 5; | |
540d72c3 | 2671 | |
3c0ef626 | 2672 | if (buf[0] != '\0') |
2673 | strlcat(buf, ",", sizeof buf); | |
bfe49944 | 2674 | strlcat(buf, cp, sizeof buf); |
3c0ef626 | 2675 | } |
2676 | } | |
2677 | if (buf[0] == '\0') | |
2678 | strlcpy(buf, "notty", sizeof buf); | |
2679 | return buf; | |
2680 | } | |
2681 | ||
2682 | void | |
2683 | session_proctitle(Session *s) | |
2684 | { | |
2685 | if (s->pw == NULL) | |
2686 | error("no user for session %d", s->self); | |
2687 | else | |
2688 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2689 | } | |
2690 | ||
2691 | int | |
2692 | session_setup_x11fwd(Session *s) | |
2693 | { | |
2694 | struct stat st; | |
e9702f7d | 2695 | char display[512], auth_display[512]; |
2696 | char hostname[MAXHOSTNAMELEN]; | |
2ce0bfe4 | 2697 | u_int i; |
3c0ef626 | 2698 | |
2699 | if (no_x11_forwarding_flag) { | |
2700 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2701 | return 0; | |
2702 | } | |
2703 | if (!options.x11_forwarding) { | |
2704 | debug("X11 forwarding disabled in server configuration file."); | |
2705 | return 0; | |
2706 | } | |
2707 | if (!options.xauth_location || | |
2708 | (stat(options.xauth_location, &st) == -1)) { | |
2709 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2710 | return 0; | |
2711 | } | |
2712 | if (options.use_login) { | |
2713 | packet_send_debug("X11 forwarding disabled; " | |
2714 | "not compatible with UseLogin=yes."); | |
2715 | return 0; | |
2716 | } | |
2717 | if (s->display != NULL) { | |
2718 | debug("X11 display already set."); | |
2719 | return 0; | |
2720 | } | |
276b07a3 | 2721 | if (x11_create_display_inet(options.x11_display_offset, |
2722 | options.x11_use_localhost, s->single_connection, | |
a7213e65 | 2723 | &s->display_number, &s->x11_chanids, |
2724 | options.hpn_disabled, options.hpn_buffer_size) == -1) { | |
3c0ef626 | 2725 | debug("x11_create_display_inet failed."); |
2726 | return 0; | |
2727 | } | |
2ce0bfe4 | 2728 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2729 | channel_register_cleanup(s->x11_chanids[i], | |
08822d99 | 2730 | session_close_single_x11, 0); |
2ce0bfe4 | 2731 | } |
e9702f7d | 2732 | |
2733 | /* Set up a suitable value for the DISPLAY variable. */ | |
2734 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2735 | fatal("gethostname: %.100s", strerror(errno)); | |
2736 | /* | |
2737 | * auth_display must be used as the displayname when the | |
2738 | * authorization entry is added with xauth(1). This will be | |
2739 | * different than the DISPLAY string for localhost displays. | |
2740 | */ | |
2741 | if (options.x11_use_localhost) { | |
276b07a3 | 2742 | snprintf(display, sizeof display, "localhost:%u.%u", |
e9702f7d | 2743 | s->display_number, s->screen); |
276b07a3 | 2744 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
e9702f7d | 2745 | s->display_number, s->screen); |
2746 | s->display = xstrdup(display); | |
2747 | s->auth_display = xstrdup(auth_display); | |
2748 | } else { | |
2749 | #ifdef IPADDR_IN_DISPLAY | |
2750 | struct hostent *he; | |
2751 | struct in_addr my_addr; | |
2752 | ||
2753 | he = gethostbyname(hostname); | |
2754 | if (he == NULL) { | |
2755 | error("Can't get IP address for X11 DISPLAY."); | |
2756 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2757 | return 0; | |
2758 | } | |
2759 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
276b07a3 | 2760 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
e9702f7d | 2761 | s->display_number, s->screen); |
2762 | #else | |
276b07a3 | 2763 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
e9702f7d | 2764 | s->display_number, s->screen); |
2765 | #endif | |
2766 | s->display = xstrdup(display); | |
2767 | s->auth_display = xstrdup(display); | |
2768 | } | |
2769 | ||
3c0ef626 | 2770 | return 1; |
2771 | } | |
2772 | ||
2773 | static void | |
2774 | do_authenticated2(Authctxt *authctxt) | |
2775 | { | |
2776 | server_loop2(authctxt); | |
540d72c3 | 2777 | } |
2778 | ||
2779 | void | |
2780 | do_cleanup(Authctxt *authctxt) | |
2781 | { | |
2782 | static int called = 0; | |
2783 | ||
2784 | debug("do_cleanup"); | |
2785 | ||
2786 | /* no cleanup if we're in the child for login shell */ | |
2787 | if (is_child) | |
2788 | return; | |
2789 | ||
2790 | /* avoid double cleanup */ | |
2791 | if (called) | |
2792 | return; | |
2793 | called = 1; | |
2794 | ||
fa0f0f45 | 2795 | if (authctxt == NULL) |
540d72c3 | 2796 | return; |
fa0f0f45 | 2797 | |
2798 | #ifdef USE_PAM | |
2799 | if (options.use_pam) { | |
2800 | sshpam_cleanup(); | |
2801 | sshpam_thread_cleanup(); | |
2802 | } | |
2803 | #endif | |
2804 | ||
2805 | if (!authctxt->authenticated) | |
2806 | return; | |
2807 | ||
540d72c3 | 2808 | #ifdef KRB5 |
2809 | if (options.kerberos_ticket_cleanup && | |
2810 | authctxt->krb5_ctx) | |
2811 | krb5_cleanup_proc(authctxt); | |
5598e598 | 2812 | #endif |
540d72c3 | 2813 | |
2814 | #ifdef GSSAPI | |
2815 | if (compat20 && options.gss_cleanup_creds) | |
2816 | ssh_gssapi_cleanup_creds(); | |
2817 | #endif | |
2818 | ||
540d72c3 | 2819 | /* remove agent socket */ |
2820 | auth_sock_cleanup_proc(authctxt->pw); | |
2821 | ||
2822 | /* | |
2823 | * Cleanup ptys/utmp only if privsep is disabled, | |
2824 | * or if running in monitor. | |
2825 | */ | |
2826 | if (!use_privsep || mm_is_monitor()) | |
2827 | session_destroy_all(session_pty_cleanup2); | |
3c0ef626 | 2828 | } |