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7368a6c8 | 1 | /* |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
bcbf86ec | 4 | * |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | * | |
e78a59f5 | 11 | * SSH2 support by Markus Friedl. |
a96070d4 | 12 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 13 | * |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions | |
16 | * are met: | |
17 | * 1. Redistributions of source code must retain the above copyright | |
18 | * notice, this list of conditions and the following disclaimer. | |
19 | * 2. Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
e78a59f5 | 33 | */ |
7368a6c8 | 34 | |
35 | #include "includes.h" | |
39dfceeb | 36 | RCSID("$OpenBSD: session.c,v 1.171 2004/01/13 19:23:15 markus Exp $"); |
7368a6c8 | 37 | |
7368a6c8 | 38 | #include "ssh.h" |
42f11eb2 | 39 | #include "ssh1.h" |
40 | #include "ssh2.h" | |
41 | #include "xmalloc.h" | |
1729c161 | 42 | #include "sshpty.h" |
7368a6c8 | 43 | #include "packet.h" |
44 | #include "buffer.h" | |
7368a6c8 | 45 | #include "mpaux.h" |
7368a6c8 | 46 | #include "uidswap.h" |
47 | #include "compat.h" | |
a5efa1bb | 48 | #include "channels.h" |
e78a59f5 | 49 | #include "bufaux.h" |
e78a59f5 | 50 | #include "auth.h" |
38c295d6 | 51 | #include "auth-options.h" |
42f11eb2 | 52 | #include "pathnames.h" |
53 | #include "log.h" | |
54 | #include "servconf.h" | |
1729c161 | 55 | #include "sshlogin.h" |
42f11eb2 | 56 | #include "serverloop.h" |
57 | #include "canohost.h" | |
5ca51e19 | 58 | #include "session.h" |
1853d1ef | 59 | #include "monitor_wrap.h" |
e78a59f5 | 60 | |
39dfceeb | 61 | #ifdef KRB5 |
62 | #include <kafs.h> | |
63 | #endif | |
64 | ||
7364bd04 | 65 | #ifdef GSSAPI |
66 | #include "ssh-gss.h" | |
67 | #endif | |
68 | ||
7368a6c8 | 69 | /* func */ |
70 | ||
71 | Session *session_new(void); | |
9c328529 | 72 | void session_set_fds(Session *, int, int, int); |
2362db19 | 73 | void session_pty_cleanup(Session *); |
9c328529 | 74 | void session_proctitle(Session *); |
75 | int session_setup_x11fwd(Session *); | |
76 | void do_exec_pty(Session *, const char *); | |
77 | void do_exec_no_pty(Session *, const char *); | |
78 | void do_exec(Session *, const char *); | |
79 | void do_login(Session *, const char *); | |
8a9ac95d | 80 | #ifdef LOGIN_NEEDS_UTMPX |
81 | static void do_pre_login(Session *s); | |
82 | #endif | |
9c328529 | 83 | void do_child(Session *, const char *); |
f2c2fd71 | 84 | void do_motd(void); |
9c328529 | 85 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 86 | |
396c147e | 87 | static void do_authenticated1(Authctxt *); |
88 | static void do_authenticated2(Authctxt *); | |
9c328529 | 89 | |
396c147e | 90 | static int session_pty_req(Session *); |
bb5639fe | 91 | |
7368a6c8 | 92 | /* import */ |
93 | extern ServerOptions options; | |
94 | extern char *__progname; | |
95 | extern int log_stderr; | |
96 | extern int debug_flag; | |
1e3b8b07 | 97 | extern u_int utmp_len; |
089fbbd2 | 98 | extern int startup_pipe; |
e78e738a | 99 | extern void destroy_sensitive_data(void); |
bc7dfc06 | 100 | extern Buffer loginmsg; |
089fbbd2 | 101 | |
b5e300c2 | 102 | /* original command from peer. */ |
c95add71 | 103 | const char *original_command = NULL; |
b5e300c2 | 104 | |
7368a6c8 | 105 | /* data */ |
106 | #define MAX_SESSIONS 10 | |
107 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 108 | |
2e73a022 | 109 | #ifdef HAVE_LOGIN_CAP |
1836f69f | 110 | login_cap_t *lc; |
2e73a022 | 111 | #endif |
112 | ||
2362db19 | 113 | static int is_child = 0; |
114 | ||
149cdb60 | 115 | /* Name and directory of socket for authentication agent forwarding. */ |
116 | static char *auth_sock_name = NULL; | |
117 | static char *auth_sock_dir = NULL; | |
118 | ||
119 | /* removes the agent forwarding socket */ | |
120 | ||
121 | static void | |
2362db19 | 122 | auth_sock_cleanup_proc(struct passwd *pw) |
149cdb60 | 123 | { |
149cdb60 | 124 | if (auth_sock_name != NULL) { |
125 | temporarily_use_uid(pw); | |
126 | unlink(auth_sock_name); | |
127 | rmdir(auth_sock_dir); | |
128 | auth_sock_name = NULL; | |
129 | restore_uid(); | |
130 | } | |
131 | } | |
132 | ||
133 | static int | |
134 | auth_input_request_forwarding(struct passwd * pw) | |
135 | { | |
136 | Channel *nc; | |
137 | int sock; | |
138 | struct sockaddr_un sunaddr; | |
139 | ||
140 | if (auth_sock_name != NULL) { | |
141 | error("authentication forwarding requested twice."); | |
142 | return 0; | |
143 | } | |
144 | ||
145 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
146 | temporarily_use_uid(pw); | |
147 | ||
148 | /* Allocate a buffer for the socket name, and format the name. */ | |
149 | auth_sock_name = xmalloc(MAXPATHLEN); | |
150 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
c88de854 | 151 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
149cdb60 | 152 | |
153 | /* Create private directory for socket */ | |
154 | if (mkdtemp(auth_sock_dir) == NULL) { | |
155 | packet_send_debug("Agent forwarding disabled: " | |
156 | "mkdtemp() failed: %.100s", strerror(errno)); | |
157 | restore_uid(); | |
158 | xfree(auth_sock_name); | |
159 | xfree(auth_sock_dir); | |
160 | auth_sock_name = NULL; | |
161 | auth_sock_dir = NULL; | |
162 | return 0; | |
163 | } | |
c457707e | 164 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
165 | auth_sock_dir, (long) getpid()); | |
149cdb60 | 166 | |
149cdb60 | 167 | /* Create the socket. */ |
168 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
169 | if (sock < 0) | |
170 | packet_disconnect("socket: %.100s", strerror(errno)); | |
171 | ||
172 | /* Bind it to the name. */ | |
173 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
174 | sunaddr.sun_family = AF_UNIX; | |
175 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
176 | ||
177 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
178 | packet_disconnect("bind: %.100s", strerror(errno)); | |
179 | ||
180 | /* Restore the privileged uid. */ | |
181 | restore_uid(); | |
182 | ||
183 | /* Start listening on the socket. */ | |
fce39749 | 184 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
149cdb60 | 185 | packet_disconnect("listen: %.100s", strerror(errno)); |
186 | ||
187 | /* Allocate a channel for the authentication agent socket. */ | |
188 | nc = channel_new("auth socket", | |
189 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
190 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 191 | 0, "auth socket", 1); |
149cdb60 | 192 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
193 | return 1; | |
194 | } | |
195 | ||
196 | ||
bb5639fe | 197 | void |
198 | do_authenticated(Authctxt *authctxt) | |
199 | { | |
381b021b | 200 | setproctitle("%s", authctxt->pw->pw_name); |
201 | ||
bb5639fe | 202 | /* |
203 | * Cancel the alarm we set to limit the time taken for | |
204 | * authentication. | |
205 | */ | |
206 | alarm(0); | |
207 | if (startup_pipe != -1) { | |
208 | close(startup_pipe); | |
209 | startup_pipe = -1; | |
210 | } | |
bb5639fe | 211 | /* setup the channel layer */ |
212 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
213 | channel_permit_all_opens(); | |
214 | ||
215 | if (compat20) | |
216 | do_authenticated2(authctxt); | |
217 | else | |
218 | do_authenticated1(authctxt); | |
e4f7282d | 219 | |
2362db19 | 220 | do_cleanup(authctxt); |
bb5639fe | 221 | } |
222 | ||
7368a6c8 | 223 | /* |
224 | * Prepares for an interactive session. This is called after the user has | |
225 | * been successfully authenticated. During this message exchange, pseudo | |
226 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
227 | * are requested, etc. | |
228 | */ | |
396c147e | 229 | static void |
bb5639fe | 230 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 231 | { |
232 | Session *s; | |
7368a6c8 | 233 | char *command; |
54a5250f | 234 | int success, type, screen_flag; |
7138ebd9 | 235 | int enable_compression_after_reply = 0; |
236 | u_int proto_len, data_len, dlen, compression_level = 0; | |
7368a6c8 | 237 | |
238 | s = session_new(); | |
ced49be2 | 239 | s->authctxt = authctxt; |
bb5639fe | 240 | s->pw = authctxt->pw; |
2e73a022 | 241 | |
7368a6c8 | 242 | /* |
243 | * We stay in this loop until the client requests to execute a shell | |
244 | * or a command. | |
245 | */ | |
246 | for (;;) { | |
bb5639fe | 247 | success = 0; |
7368a6c8 | 248 | |
249 | /* Get a packet from the client. */ | |
54a5250f | 250 | type = packet_read(); |
7368a6c8 | 251 | |
252 | /* Process the packet. */ | |
253 | switch (type) { | |
254 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 255 | compression_level = packet_get_int(); |
95500969 | 256 | packet_check_eom(); |
7368a6c8 | 257 | if (compression_level < 1 || compression_level > 9) { |
258 | packet_send_debug("Received illegal compression level %d.", | |
184eed6a | 259 | compression_level); |
7368a6c8 | 260 | break; |
261 | } | |
636f76ca | 262 | if (!options.compression) { |
263 | debug2("compression disabled"); | |
264 | break; | |
265 | } | |
7368a6c8 | 266 | /* Enable compression after we have responded with SUCCESS. */ |
267 | enable_compression_after_reply = 1; | |
268 | success = 1; | |
269 | break; | |
270 | ||
271 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 272 | success = session_pty_req(s); |
7368a6c8 | 273 | break; |
274 | ||
275 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 276 | s->auth_proto = packet_get_string(&proto_len); |
277 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 278 | |
2af09193 | 279 | screen_flag = packet_get_protocol_flags() & |
280 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
281 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
282 | ||
283 | if (packet_remaining() == 4) { | |
284 | if (!screen_flag) | |
285 | debug2("Buggy client: " | |
286 | "X11 screen flag missing"); | |
7368a6c8 | 287 | s->screen = packet_get_int(); |
c8b058b4 | 288 | } else { |
7368a6c8 | 289 | s->screen = 0; |
c8b058b4 | 290 | } |
95500969 | 291 | packet_check_eom(); |
8dcd9d5c | 292 | success = session_setup_x11fwd(s); |
293 | if (!success) { | |
294 | xfree(s->auth_proto); | |
295 | xfree(s->auth_data); | |
1500bcdd | 296 | s->auth_proto = NULL; |
297 | s->auth_data = NULL; | |
7368a6c8 | 298 | } |
7368a6c8 | 299 | break; |
7368a6c8 | 300 | |
301 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
302 | if (no_agent_forwarding_flag || compat13) { | |
303 | debug("Authentication agent forwarding not permitted for this authentication."); | |
304 | break; | |
305 | } | |
306 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 307 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 308 | break; |
309 | ||
310 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
311 | if (no_port_forwarding_flag) { | |
312 | debug("Port forwarding not permitted for this authentication."); | |
313 | break; | |
314 | } | |
33de75a3 | 315 | if (!options.allow_tcp_forwarding) { |
316 | debug("Port forwarding not permitted."); | |
317 | break; | |
318 | } | |
7368a6c8 | 319 | debug("Received TCP/IP port forwarding request."); |
bb5639fe | 320 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 321 | success = 1; |
322 | break; | |
323 | ||
324 | case SSH_CMSG_MAX_PACKET_SIZE: | |
325 | if (packet_set_maxsize(packet_get_int()) > 0) | |
326 | success = 1; | |
327 | break; | |
184eed6a | 328 | |
7368a6c8 | 329 | case SSH_CMSG_EXEC_SHELL: |
330 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 331 | if (type == SSH_CMSG_EXEC_CMD) { |
332 | command = packet_get_string(&dlen); | |
333 | debug("Exec command '%.500s'", command); | |
c95add71 | 334 | do_exec(s, command); |
335 | xfree(command); | |
7368a6c8 | 336 | } else { |
c95add71 | 337 | do_exec(s, NULL); |
7368a6c8 | 338 | } |
95500969 | 339 | packet_check_eom(); |
fc2a1d28 | 340 | session_close(s); |
7368a6c8 | 341 | return; |
342 | ||
343 | default: | |
344 | /* | |
345 | * Any unknown messages in this phase are ignored, | |
346 | * and a failure message is returned. | |
347 | */ | |
bbe88b6d | 348 | logit("Unknown packet type received after authentication: %d", type); |
7368a6c8 | 349 | } |
350 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
351 | packet_send(); | |
352 | packet_write_wait(); | |
353 | ||
354 | /* Enable compression now that we have replied if appropriate. */ | |
355 | if (enable_compression_after_reply) { | |
356 | enable_compression_after_reply = 0; | |
357 | packet_start_compression(compression_level); | |
358 | } | |
359 | } | |
360 | } | |
361 | ||
362 | /* | |
363 | * This is called to fork and execute a command when we have no tty. This | |
364 | * will call do_child from the child, and server_loop from the parent after | |
365 | * setting up file descriptors and such. | |
366 | */ | |
6ae2364d | 367 | void |
65068d16 | 368 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 369 | { |
c457707e | 370 | pid_t pid; |
7368a6c8 | 371 | |
372 | #ifdef USE_PIPES | |
373 | int pin[2], pout[2], perr[2]; | |
374 | /* Allocate pipes for communicating with the program. */ | |
375 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
376 | packet_disconnect("Could not create pipes: %.100s", | |
377 | strerror(errno)); | |
378 | #else /* USE_PIPES */ | |
379 | int inout[2], err[2]; | |
380 | /* Uses socket pairs to communicate with the program. */ | |
381 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
382 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
383 | packet_disconnect("Could not create socket pairs: %.100s", | |
384 | strerror(errno)); | |
385 | #endif /* USE_PIPES */ | |
386 | if (s == NULL) | |
387 | fatal("do_exec_no_pty: no session"); | |
388 | ||
1d1ffb87 | 389 | session_proctitle(s); |
7368a6c8 | 390 | |
b19d61d7 | 391 | #if defined(USE_PAM) |
7fceb20d | 392 | if (options.use_pam) { |
7fceb20d | 393 | do_pam_setcred(1); |
394 | if (is_pam_password_change_required()) | |
395 | packet_disconnect("Password change required but no " | |
396 | "TTY available"); | |
397 | } | |
266140a8 | 398 | #endif /* USE_PAM */ |
399 | ||
7368a6c8 | 400 | /* Fork the child. */ |
401 | if ((pid = fork()) == 0) { | |
2362db19 | 402 | is_child = 1; |
516f0d7d | 403 | |
7368a6c8 | 404 | /* Child. Reinitialize the log since the pid has changed. */ |
405 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
406 | ||
407 | /* | |
408 | * Create a new session and process group since the 4.4BSD | |
409 | * setlogin() affects the entire process group. | |
410 | */ | |
411 | if (setsid() < 0) | |
412 | error("setsid failed: %.100s", strerror(errno)); | |
413 | ||
414 | #ifdef USE_PIPES | |
415 | /* | |
416 | * Redirect stdin. We close the parent side of the socket | |
417 | * pair, and make the child side the standard input. | |
418 | */ | |
419 | close(pin[1]); | |
420 | if (dup2(pin[0], 0) < 0) | |
421 | perror("dup2 stdin"); | |
422 | close(pin[0]); | |
423 | ||
424 | /* Redirect stdout. */ | |
425 | close(pout[0]); | |
426 | if (dup2(pout[1], 1) < 0) | |
427 | perror("dup2 stdout"); | |
428 | close(pout[1]); | |
429 | ||
430 | /* Redirect stderr. */ | |
431 | close(perr[0]); | |
432 | if (dup2(perr[1], 2) < 0) | |
433 | perror("dup2 stderr"); | |
434 | close(perr[1]); | |
435 | #else /* USE_PIPES */ | |
436 | /* | |
437 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
438 | * use the same socket, as some programs (particularly rdist) | |
439 | * seem to depend on it. | |
440 | */ | |
441 | close(inout[1]); | |
442 | close(err[1]); | |
443 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
444 | perror("dup2 stdin"); | |
445 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
446 | perror("dup2 stdout"); | |
447 | if (dup2(err[0], 2) < 0) /* stderr */ | |
448 | perror("dup2 stderr"); | |
449 | #endif /* USE_PIPES */ | |
450 | ||
ef51930f | 451 | #ifdef _UNICOS |
452 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
453 | #endif | |
454 | ||
7368a6c8 | 455 | /* Do processing for the child (exec command etc). */ |
56b3e9ce | 456 | do_child(s, command); |
7368a6c8 | 457 | /* NOTREACHED */ |
458 | } | |
ef51930f | 459 | #ifdef _UNICOS |
460 | signal(WJSIGNAL, cray_job_termination_handler); | |
461 | #endif /* _UNICOS */ | |
3c62e7eb | 462 | #ifdef HAVE_CYGWIN |
463 | if (is_winnt) | |
464 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
465 | #endif | |
7368a6c8 | 466 | if (pid < 0) |
467 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
468 | s->pid = pid; | |
b5c334cc | 469 | /* Set interactive/non-interactive mode. */ |
470 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 471 | #ifdef USE_PIPES |
472 | /* We are the parent. Close the child sides of the pipes. */ | |
473 | close(pin[0]); | |
474 | close(pout[1]); | |
475 | close(perr[1]); | |
476 | ||
e78a59f5 | 477 | if (compat20) { |
e5d7a405 | 478 | session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); |
e78a59f5 | 479 | } else { |
480 | /* Enter the interactive session. */ | |
481 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 482 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 483 | } |
7368a6c8 | 484 | #else /* USE_PIPES */ |
485 | /* We are the parent. Close the child sides of the socket pairs. */ | |
486 | close(inout[0]); | |
487 | close(err[0]); | |
488 | ||
489 | /* | |
490 | * Enter the interactive session. Note: server_loop must be able to | |
491 | * handle the case that fdin and fdout are the same. | |
492 | */ | |
e78a59f5 | 493 | if (compat20) { |
e5d7a405 | 494 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 495 | } else { |
496 | server_loop(pid, inout[1], inout[1], err[1]); | |
497 | /* server_loop has closed inout[1] and err[1]. */ | |
498 | } | |
7368a6c8 | 499 | #endif /* USE_PIPES */ |
500 | } | |
501 | ||
502 | /* | |
503 | * This is called to fork and execute a command when we have a tty. This | |
504 | * will call do_child from the child, and server_loop from the parent after | |
505 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
506 | * lastlog, and other such operations. | |
507 | */ | |
6ae2364d | 508 | void |
65068d16 | 509 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 510 | { |
7368a6c8 | 511 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 512 | pid_t pid; |
7368a6c8 | 513 | |
514 | if (s == NULL) | |
515 | fatal("do_exec_pty: no session"); | |
516 | ptyfd = s->ptyfd; | |
517 | ttyfd = s->ttyfd; | |
518 | ||
b19d61d7 | 519 | #if defined(USE_PAM) |
7fceb20d | 520 | if (options.use_pam) { |
49e82bb9 | 521 | do_pam_set_tty(s->tty); |
7fceb20d | 522 | do_pam_setcred(1); |
523 | } | |
27cf96de | 524 | #endif |
266140a8 | 525 | |
7368a6c8 | 526 | /* Fork the child. */ |
527 | if ((pid = fork()) == 0) { | |
2362db19 | 528 | is_child = 1; |
57156994 | 529 | |
c345cf9d | 530 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 531 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 532 | /* Close the master side of the pseudo tty. */ |
533 | close(ptyfd); | |
534 | ||
535 | /* Make the pseudo tty our controlling tty. */ | |
536 | pty_make_controlling_tty(&ttyfd, s->tty); | |
537 | ||
05fd093c | 538 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
539 | if (dup2(ttyfd, 0) < 0) | |
540 | error("dup2 stdin: %s", strerror(errno)); | |
541 | if (dup2(ttyfd, 1) < 0) | |
542 | error("dup2 stdout: %s", strerror(errno)); | |
543 | if (dup2(ttyfd, 2) < 0) | |
544 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 545 | |
546 | /* Close the extra descriptor for the pseudo tty. */ | |
547 | close(ttyfd); | |
548 | ||
c345cf9d | 549 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 550 | #ifndef HAVE_OSF_SIA |
ef51930f | 551 | if (!(options.use_login && command == NULL)) { |
552 | #ifdef _UNICOS | |
553 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
554 | #endif /* _UNICOS */ | |
a22aff1f | 555 | do_login(s, command); |
ef51930f | 556 | } |
7e2d5fa4 | 557 | # ifdef LOGIN_NEEDS_UTMPX |
558 | else | |
559 | do_pre_login(s); | |
560 | # endif | |
c96a4aaf | 561 | #endif |
7368a6c8 | 562 | |
7368a6c8 | 563 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 564 | do_child(s, command); |
7368a6c8 | 565 | /* NOTREACHED */ |
566 | } | |
ef51930f | 567 | #ifdef _UNICOS |
568 | signal(WJSIGNAL, cray_job_termination_handler); | |
569 | #endif /* _UNICOS */ | |
3c62e7eb | 570 | #ifdef HAVE_CYGWIN |
571 | if (is_winnt) | |
572 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
573 | #endif | |
7368a6c8 | 574 | if (pid < 0) |
575 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
576 | s->pid = pid; | |
577 | ||
578 | /* Parent. Close the slave side of the pseudo tty. */ | |
579 | close(ttyfd); | |
580 | ||
581 | /* | |
582 | * Create another descriptor of the pty master side for use as the | |
583 | * standard input. We could use the original descriptor, but this | |
584 | * simplifies code in server_loop. The descriptor is bidirectional. | |
585 | */ | |
586 | fdout = dup(ptyfd); | |
587 | if (fdout < 0) | |
588 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
589 | ||
590 | /* we keep a reference to the pty master */ | |
591 | ptymaster = dup(ptyfd); | |
592 | if (ptymaster < 0) | |
593 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
594 | s->ptymaster = ptymaster; | |
595 | ||
596 | /* Enter interactive session. */ | |
b5c334cc | 597 | packet_set_interactive(1); |
e78a59f5 | 598 | if (compat20) { |
599 | session_set_fds(s, ptyfd, fdout, -1); | |
600 | } else { | |
601 | server_loop(pid, ptyfd, fdout, -1); | |
602 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 603 | } |
7368a6c8 | 604 | } |
605 | ||
7e2d5fa4 | 606 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 607 | static void |
7e2d5fa4 | 608 | do_pre_login(Session *s) |
609 | { | |
610 | socklen_t fromlen; | |
611 | struct sockaddr_storage from; | |
612 | pid_t pid = getpid(); | |
613 | ||
614 | /* | |
615 | * Get IP address of client. If the connection is not a socket, let | |
616 | * the address be 0.0.0.0. | |
617 | */ | |
618 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 619 | fromlen = sizeof(from); |
7e2d5fa4 | 620 | if (packet_connection_is_on_socket()) { |
7e2d5fa4 | 621 | if (getpeername(packet_get_connection_in(), |
184eed6a | 622 | (struct sockaddr *) & from, &fromlen) < 0) { |
7e2d5fa4 | 623 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 624 | cleanup_exit(255); |
7e2d5fa4 | 625 | } |
626 | } | |
627 | ||
628 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
c5a7d788 | 629 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d4ac26ed | 630 | (struct sockaddr *)&from, fromlen); |
7e2d5fa4 | 631 | } |
632 | #endif | |
633 | ||
dac6753b | 634 | /* |
635 | * This is called to fork and execute a command. If another command is | |
636 | * to be forced, execute that instead. | |
637 | */ | |
638 | void | |
639 | do_exec(Session *s, const char *command) | |
640 | { | |
641 | if (forced_command) { | |
642 | original_command = command; | |
643 | command = forced_command; | |
dac6753b | 644 | debug("Forced command '%.900s'", command); |
645 | } | |
646 | ||
f89f8ddc | 647 | #ifdef GSSAPI |
648 | if (options.gss_authentication) { | |
649 | temporarily_use_uid(s->pw); | |
650 | ssh_gssapi_storecreds(); | |
651 | restore_uid(); | |
652 | } | |
653 | #endif | |
654 | ||
dac6753b | 655 | if (s->ttyfd != -1) |
656 | do_exec_pty(s, command); | |
657 | else | |
658 | do_exec_no_pty(s, command); | |
659 | ||
c95add71 | 660 | original_command = NULL; |
dac6753b | 661 | } |
662 | ||
f7342052 | 663 | |
c345cf9d | 664 | /* administrative, login(1)-like work */ |
665 | void | |
a22aff1f | 666 | do_login(Session *s, const char *command) |
c345cf9d | 667 | { |
c345cf9d | 668 | char *time_string; |
c345cf9d | 669 | socklen_t fromlen; |
670 | struct sockaddr_storage from; | |
c345cf9d | 671 | struct passwd * pw = s->pw; |
672 | pid_t pid = getpid(); | |
673 | ||
674 | /* | |
675 | * Get IP address of client. If the connection is not a socket, let | |
676 | * the address be 0.0.0.0. | |
677 | */ | |
678 | memset(&from, 0, sizeof(from)); | |
d4ac26ed | 679 | fromlen = sizeof(from); |
c345cf9d | 680 | if (packet_connection_is_on_socket()) { |
c345cf9d | 681 | if (getpeername(packet_get_connection_in(), |
f7342052 | 682 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 683 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 684 | cleanup_exit(255); |
c345cf9d | 685 | } |
686 | } | |
687 | ||
688 | /* Record that there was a login on that tty from the remote host. */ | |
49a34e84 | 689 | if (!use_privsep) |
690 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
691 | get_remote_name_or_ip(utmp_len, | |
c5a7d788 | 692 | options.use_dns), |
ba1566dd | 693 | (struct sockaddr *)&from, fromlen); |
c345cf9d | 694 | |
2919e060 | 695 | #ifdef USE_PAM |
696 | /* | |
697 | * If password change is needed, do it now. | |
698 | * This needs to occur before the ~/.hushlogin check. | |
699 | */ | |
7fceb20d | 700 | if (options.use_pam && is_pam_password_change_required()) { |
2919e060 | 701 | print_pam_messages(); |
702 | do_pam_chauthtok(); | |
5b9e2464 | 703 | /* XXX - signal [net] parent to enable forwardings */ |
2919e060 | 704 | } |
705 | #endif | |
706 | ||
f2c2fd71 | 707 | if (check_quietlogin(s, command)) |
c345cf9d | 708 | return; |
709 | ||
710 | #ifdef USE_PAM | |
7fceb20d | 711 | if (options.use_pam && !is_pam_password_change_required()) |
2919e060 | 712 | print_pam_messages(); |
c345cf9d | 713 | #endif /* USE_PAM */ |
bc7dfc06 | 714 | |
715 | /* display post-login message */ | |
716 | if (buffer_len(&loginmsg) > 0) { | |
717 | buffer_append(&loginmsg, "\0", 1); | |
718 | printf("%s\n", (char *)buffer_ptr(&loginmsg)); | |
719 | } | |
720 | buffer_free(&loginmsg); | |
c345cf9d | 721 | |
ef51930f | 722 | #ifndef NO_SSH_LASTLOG |
ffbf7323 | 723 | if (options.print_lastlog && s->last_login_time != 0) { |
724 | time_string = ctime(&s->last_login_time); | |
c345cf9d | 725 | if (strchr(time_string, '\n')) |
726 | *strchr(time_string, '\n') = 0; | |
ffbf7323 | 727 | if (strcmp(s->hostname, "") == 0) |
c345cf9d | 728 | printf("Last login: %s\r\n", time_string); |
729 | else | |
ffbf7323 | 730 | printf("Last login: %s from %s\r\n", time_string, |
731 | s->hostname); | |
c345cf9d | 732 | } |
ef51930f | 733 | #endif /* NO_SSH_LASTLOG */ |
f2c2fd71 | 734 | |
735 | do_motd(); | |
736 | } | |
737 | ||
738 | /* | |
739 | * Display the message of the day. | |
740 | */ | |
741 | void | |
742 | do_motd(void) | |
743 | { | |
744 | FILE *f; | |
745 | char buf[256]; | |
746 | ||
c345cf9d | 747 | if (options.print_motd) { |
2e73a022 | 748 | #ifdef HAVE_LOGIN_CAP |
749 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
750 | "/etc/motd"), "r"); | |
751 | #else | |
c345cf9d | 752 | f = fopen("/etc/motd", "r"); |
2e73a022 | 753 | #endif |
c345cf9d | 754 | if (f) { |
755 | while (fgets(buf, sizeof(buf), f)) | |
756 | fputs(buf, stdout); | |
757 | fclose(f); | |
758 | } | |
759 | } | |
760 | } | |
761 | ||
9c328529 | 762 | |
763 | /* | |
764 | * Check for quiet login, either .hushlogin or command given. | |
765 | */ | |
766 | int | |
767 | check_quietlogin(Session *s, const char *command) | |
768 | { | |
769 | char buf[256]; | |
770 | struct passwd *pw = s->pw; | |
771 | struct stat st; | |
772 | ||
773 | /* Return 1 if .hushlogin exists or a command given. */ | |
774 | if (command != NULL) | |
775 | return 1; | |
776 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
777 | #ifdef HAVE_LOGIN_CAP | |
778 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
779 | return 1; | |
780 | #else | |
781 | if (stat(buf, &st) >= 0) | |
782 | return 1; | |
783 | #endif | |
784 | return 0; | |
785 | } | |
786 | ||
7368a6c8 | 787 | /* |
788 | * Sets the value of the given variable in the environment. If the variable | |
789 | * already exists, its value is overriden. | |
790 | */ | |
7364bd04 | 791 | void |
1e3b8b07 | 792 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
184eed6a | 793 | const char *value) |
7368a6c8 | 794 | { |
7368a6c8 | 795 | char **env; |
c46e584f | 796 | u_int envsize; |
797 | u_int i, namelen; | |
7368a6c8 | 798 | |
95b99395 | 799 | /* |
800 | * If we're passed an uninitialized list, allocate a single null | |
801 | * entry before continuing. | |
802 | */ | |
803 | if (*envp == NULL && *envsizep == 0) { | |
804 | *envp = xmalloc(sizeof(char *)); | |
805 | *envp[0] = NULL; | |
806 | *envsizep = 1; | |
807 | } | |
808 | ||
7368a6c8 | 809 | /* |
810 | * Find the slot where the value should be stored. If the variable | |
811 | * already exists, we reuse the slot; otherwise we append a new slot | |
812 | * at the end of the array, expanding if necessary. | |
813 | */ | |
814 | env = *envp; | |
815 | namelen = strlen(name); | |
816 | for (i = 0; env[i]; i++) | |
817 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
818 | break; | |
819 | if (env[i]) { | |
820 | /* Reuse the slot. */ | |
821 | xfree(env[i]); | |
822 | } else { | |
823 | /* New variable. Expand if necessary. */ | |
c46e584f | 824 | envsize = *envsizep; |
825 | if (i >= envsize - 1) { | |
826 | if (envsize >= 1000) | |
827 | fatal("child_set_env: too many env vars"); | |
828 | envsize += 50; | |
829 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); | |
830 | *envsizep = envsize; | |
7368a6c8 | 831 | } |
832 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
833 | env[i + 1] = NULL; | |
834 | } | |
835 | ||
836 | /* Allocate space and format the variable in the appropriate slot. */ | |
837 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
838 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
839 | } | |
840 | ||
841 | /* | |
842 | * Reads environment variables from the given file and adds/overrides them | |
843 | * into the environment. If the file does not exist, this does nothing. | |
844 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
845 | * and assignments of the form name=value. No other forms are allowed. | |
846 | */ | |
396c147e | 847 | static void |
1e3b8b07 | 848 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 849 | const char *filename) |
7368a6c8 | 850 | { |
851 | FILE *f; | |
852 | char buf[4096]; | |
853 | char *cp, *value; | |
66087567 | 854 | u_int lineno = 0; |
7368a6c8 | 855 | |
856 | f = fopen(filename, "r"); | |
857 | if (!f) | |
858 | return; | |
859 | ||
860 | while (fgets(buf, sizeof(buf), f)) { | |
66087567 | 861 | if (++lineno > 1000) |
862 | fatal("Too many lines in environment file %s", filename); | |
7368a6c8 | 863 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
864 | ; | |
865 | if (!*cp || *cp == '#' || *cp == '\n') | |
866 | continue; | |
867 | if (strchr(cp, '\n')) | |
868 | *strchr(cp, '\n') = '\0'; | |
869 | value = strchr(cp, '='); | |
870 | if (value == NULL) { | |
66087567 | 871 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
872 | filename); | |
7368a6c8 | 873 | continue; |
874 | } | |
71276795 | 875 | /* |
876 | * Replace the equals sign by nul, and advance value to | |
877 | * the value string. | |
878 | */ | |
7368a6c8 | 879 | *value = '\0'; |
880 | value++; | |
881 | child_set_env(env, envsize, cp, value); | |
882 | } | |
883 | fclose(f); | |
884 | } | |
885 | ||
95b99395 | 886 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
887 | /* | |
888 | * Return named variable from specified environment, or NULL if not present. | |
889 | */ | |
890 | static char * | |
891 | child_get_env(char **env, const char *name) | |
892 | { | |
893 | int i; | |
894 | size_t len; | |
895 | ||
896 | len = strlen(name); | |
897 | for (i=0; env[i] != NULL; i++) | |
898 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
899 | return(env[i] + len + 1); | |
900 | return NULL; | |
901 | } | |
902 | ||
903 | /* | |
904 | * Read /etc/default/login. | |
905 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
906 | */ | |
907 | static void | |
908 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
909 | { | |
910 | char **tmpenv = NULL, *var; | |
6f99680f | 911 | u_int i, tmpenvsize = 0; |
3a23ba0e | 912 | u_long mask; |
95b99395 | 913 | |
914 | /* | |
915 | * We don't want to copy the whole file to the child's environment, | |
916 | * so we use a temporary environment and copy the variables we're | |
917 | * interested in. | |
918 | */ | |
919 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
920 | ||
6f99680f | 921 | if (tmpenv == NULL) |
922 | return; | |
923 | ||
95b99395 | 924 | if (uid == 0) |
925 | var = child_get_env(tmpenv, "SUPATH"); | |
926 | else | |
927 | var = child_get_env(tmpenv, "PATH"); | |
928 | if (var != NULL) | |
929 | child_set_env(env, envsize, "PATH", var); | |
b6453d99 | 930 | |
95b99395 | 931 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
932 | if (sscanf(var, "%5lo", &mask) == 1) | |
3a23ba0e | 933 | umask((mode_t)mask); |
b6453d99 | 934 | |
95b99395 | 935 | for (i = 0; tmpenv[i] != NULL; i++) |
936 | xfree(tmpenv[i]); | |
937 | xfree(tmpenv); | |
938 | } | |
939 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
940 | ||
760b35a6 | 941 | void copy_environment(char **source, char ***env, u_int *envsize) |
7368a6c8 | 942 | { |
760b35a6 | 943 | char *var_name, *var_val; |
7368a6c8 | 944 | int i; |
945 | ||
760b35a6 | 946 | if (source == NULL) |
7368a6c8 | 947 | return; |
2b87da3b | 948 | |
760b35a6 | 949 | for(i = 0; source[i] != NULL; i++) { |
950 | var_name = xstrdup(source[i]); | |
951 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
952 | xfree(var_name); | |
7368a6c8 | 953 | continue; |
7368a6c8 | 954 | } |
760b35a6 | 955 | *var_val++ = '\0'; |
7368a6c8 | 956 | |
760b35a6 | 957 | debug3("Copy environment: %s=%s", var_name, var_val); |
958 | child_set_env(env, envsize, var_name, var_val); | |
b6453d99 | 959 | |
760b35a6 | 960 | xfree(var_name); |
22d89d24 | 961 | } |
962 | } | |
22d89d24 | 963 | |
f7342052 | 964 | static char ** |
965 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 966 | { |
7368a6c8 | 967 | char buf[256]; |
f7342052 | 968 | u_int i, envsize; |
95b99395 | 969 | char **env, *laddr, *path = NULL; |
f7342052 | 970 | struct passwd *pw = s->pw; |
7368a6c8 | 971 | |
7368a6c8 | 972 | /* Initialize the environment. */ |
973 | envsize = 100; | |
974 | env = xmalloc(envsize * sizeof(char *)); | |
975 | env[0] = NULL; | |
976 | ||
3c62e7eb | 977 | #ifdef HAVE_CYGWIN |
978 | /* | |
979 | * The Windows environment contains some setting which are | |
980 | * important for a running system. They must not be dropped. | |
981 | */ | |
760b35a6 | 982 | copy_environment(environ, &env, &envsize); |
3c62e7eb | 983 | #endif |
984 | ||
7364bd04 | 985 | #ifdef GSSAPI |
aff51935 | 986 | /* Allow any GSSAPI methods that we've used to alter |
7364bd04 | 987 | * the childs environment as they see fit |
988 | */ | |
989 | ssh_gssapi_do_child(&env, &envsize); | |
990 | #endif | |
991 | ||
7368a6c8 | 992 | if (!options.use_login) { |
993 | /* Set basic environment. */ | |
994 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
995 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
17ed08c5 | 996 | #ifdef _AIX |
997 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
998 | #endif | |
7368a6c8 | 999 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
2e73a022 | 1000 | #ifdef HAVE_LOGIN_CAP |
97686bf9 | 1001 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1002 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1003 | else | |
1004 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1005 | #else /* HAVE_LOGIN_CAP */ |
1006 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1007 | /* |
1008 | * There's no standard path on Windows. The path contains | |
1009 | * important components pointing to the system directories, | |
1010 | * needed for loading shared libraries. So the path better | |
1011 | * remains intact here. | |
1012 | */ | |
95b99395 | 1013 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1014 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1015 | path = child_get_env(env, "PATH"); | |
1016 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1017 | if (path == NULL || *path == '\0') { | |
aff51935 | 1018 | child_set_env(&env, &envsize, "PATH", |
95b99395 | 1019 | s->pw->pw_uid == 0 ? |
1020 | SUPERUSER_PATH : _PATH_STDPATH); | |
1021 | } | |
22d89d24 | 1022 | # endif /* HAVE_CYGWIN */ |
1023 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1024 | |
1025 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1026 | _PATH_MAILDIR, pw->pw_name); | |
1027 | child_set_env(&env, &envsize, "MAIL", buf); | |
1028 | ||
1029 | /* Normal systems set SHELL by default. */ | |
1030 | child_set_env(&env, &envsize, "SHELL", shell); | |
1031 | } | |
1032 | if (getenv("TZ")) | |
1033 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1034 | ||
1035 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 1036 | if (!options.use_login) { |
1037 | while (custom_environment) { | |
1038 | struct envstring *ce = custom_environment; | |
7fdc56c5 | 1039 | char *str = ce->s; |
f7342052 | 1040 | |
7fdc56c5 | 1041 | for (i = 0; str[i] != '=' && str[i]; i++) |
2548961d | 1042 | ; |
7fdc56c5 | 1043 | if (str[i] == '=') { |
1044 | str[i] = 0; | |
1045 | child_set_env(&env, &envsize, str, str + i + 1); | |
2548961d | 1046 | } |
1047 | custom_environment = ce->next; | |
1048 | xfree(ce->s); | |
1049 | xfree(ce); | |
7368a6c8 | 1050 | } |
7368a6c8 | 1051 | } |
1052 | ||
da0561eb | 1053 | /* SSH_CLIENT deprecated */ |
7368a6c8 | 1054 | snprintf(buf, sizeof buf, "%.50s %d %d", |
f7342052 | 1055 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1056 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1057 | ||
3e2f2431 | 1058 | laddr = get_local_ipaddr(packet_get_connection_in()); |
da0561eb | 1059 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
3e2f2431 | 1060 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1061 | xfree(laddr); | |
da0561eb | 1062 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1063 | ||
56b3e9ce | 1064 | if (s->ttyfd != -1) |
1065 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1066 | if (s->term) | |
1067 | child_set_env(&env, &envsize, "TERM", s->term); | |
1068 | if (s->display) | |
1069 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1070 | if (original_command) |
1071 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1072 | original_command); | |
7368a6c8 | 1073 | |
ef51930f | 1074 | #ifdef _UNICOS |
1075 | if (cray_tmpdir[0] != '\0') | |
1076 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1077 | #endif /* _UNICOS */ | |
1078 | ||
7368a6c8 | 1079 | #ifdef _AIX |
4936fcee | 1080 | { |
1081 | char *cp; | |
1082 | ||
1083 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1084 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1085 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1086 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1087 | read_environment_file(&env, &envsize, "/etc/environment"); | |
1088 | } | |
7368a6c8 | 1089 | #endif |
ced49be2 | 1090 | #ifdef KRB5 |
1091 | if (s->authctxt->krb5_ticket_file) | |
1092 | child_set_env(&env, &envsize, "KRB5CCNAME", | |
1093 | s->authctxt->krb5_ticket_file); | |
1094 | #endif | |
7368a6c8 | 1095 | #ifdef USE_PAM |
ee48c949 | 1096 | /* |
1097 | * Pull in any environment variables that may have | |
1098 | * been set by PAM. | |
1099 | */ | |
7fceb20d | 1100 | if (options.use_pam) { |
2212fc98 | 1101 | char **p; |
b6453d99 | 1102 | |
2212fc98 | 1103 | p = fetch_pam_child_environment(); |
1104 | copy_environment(p, &env, &envsize); | |
1105 | free_pam_environment(p); | |
ee48c949 | 1106 | |
2212fc98 | 1107 | p = fetch_pam_environment(); |
ee48c949 | 1108 | copy_environment(p, &env, &envsize); |
1109 | free_pam_environment(p); | |
1110 | } | |
7368a6c8 | 1111 | #endif /* USE_PAM */ |
1112 | ||
149cdb60 | 1113 | if (auth_sock_name != NULL) |
7368a6c8 | 1114 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1115 | auth_sock_name); |
7368a6c8 | 1116 | |
1117 | /* read $HOME/.ssh/environment. */ | |
f00bab84 | 1118 | if (options.permit_user_env && !options.use_login) { |
71276795 | 1119 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e2e36358 | 1120 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
7368a6c8 | 1121 | read_environment_file(&env, &envsize, buf); |
1122 | } | |
1123 | if (debug_flag) { | |
1124 | /* dump the environment */ | |
1125 | fprintf(stderr, "Environment:\n"); | |
1126 | for (i = 0; env[i]; i++) | |
1127 | fprintf(stderr, " %.200s\n", env[i]); | |
1128 | } | |
f7342052 | 1129 | return env; |
1130 | } | |
1131 | ||
1132 | /* | |
1133 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1134 | * first in this order). | |
1135 | */ | |
1136 | static void | |
1137 | do_rc_files(Session *s, const char *shell) | |
1138 | { | |
1139 | FILE *f = NULL; | |
1140 | char cmd[1024]; | |
1141 | int do_xauth; | |
1142 | struct stat st; | |
1143 | ||
1144 | do_xauth = | |
1145 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1146 | ||
1147 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1148 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1149 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1150 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1151 | if (debug_flag) | |
1152 | fprintf(stderr, "Running %s\n", cmd); | |
1153 | f = popen(cmd, "w"); | |
1154 | if (f) { | |
1155 | if (do_xauth) | |
1156 | fprintf(f, "%s %s\n", s->auth_proto, | |
1157 | s->auth_data); | |
1158 | pclose(f); | |
1159 | } else | |
1160 | fprintf(stderr, "Could not run %s\n", | |
1161 | _PATH_SSH_USER_RC); | |
1162 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1163 | if (debug_flag) | |
1164 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1165 | _PATH_SSH_SYSTEM_RC); | |
1166 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1167 | if (f) { | |
1168 | if (do_xauth) | |
1169 | fprintf(f, "%s %s\n", s->auth_proto, | |
1170 | s->auth_data); | |
1171 | pclose(f); | |
1172 | } else | |
1173 | fprintf(stderr, "Could not run %s\n", | |
1174 | _PATH_SSH_SYSTEM_RC); | |
1175 | } else if (do_xauth && options.xauth_location != NULL) { | |
1176 | /* Add authority data to .Xauthority if appropriate. */ | |
1177 | if (debug_flag) { | |
1178 | fprintf(stderr, | |
fe661d8f | 1179 | "Running %.500s remove %.100s\n", |
2362db19 | 1180 | options.xauth_location, s->auth_display); |
fe661d8f | 1181 | fprintf(stderr, |
1182 | "%.500s add %.100s %.100s %.100s\n", | |
f7342052 | 1183 | options.xauth_location, s->auth_display, |
1184 | s->auth_proto, s->auth_data); | |
1185 | } | |
1186 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1187 | options.xauth_location); | |
1188 | f = popen(cmd, "w"); | |
1189 | if (f) { | |
fe661d8f | 1190 | fprintf(f, "remove %s\n", |
1191 | s->auth_display); | |
f7342052 | 1192 | fprintf(f, "add %s %s %s\n", |
1193 | s->auth_display, s->auth_proto, | |
1194 | s->auth_data); | |
1195 | pclose(f); | |
1196 | } else { | |
1197 | fprintf(stderr, "Could not run %s\n", | |
1198 | cmd); | |
1199 | } | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | static void | |
1204 | do_nologin(struct passwd *pw) | |
1205 | { | |
1206 | FILE *f = NULL; | |
1207 | char buf[1024]; | |
1208 | ||
1209 | #ifdef HAVE_LOGIN_CAP | |
1210 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1211 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1212 | _PATH_NOLOGIN), "r"); | |
1213 | #else | |
1214 | if (pw->pw_uid) | |
1215 | f = fopen(_PATH_NOLOGIN, "r"); | |
1216 | #endif | |
1217 | if (f) { | |
1218 | /* /etc/nologin exists. Print its contents and exit. */ | |
bbe88b6d | 1219 | logit("User %.100s not allowed because %s exists", |
8bd4e2ae | 1220 | pw->pw_name, _PATH_NOLOGIN); |
f7342052 | 1221 | while (fgets(buf, sizeof(buf), f)) |
1222 | fputs(buf, stderr); | |
1223 | fclose(f); | |
99f4fb69 | 1224 | fflush(NULL); |
f7342052 | 1225 | exit(254); |
1226 | } | |
1227 | } | |
1228 | ||
1229 | /* Set login name, uid, gid, and groups. */ | |
1853d1ef | 1230 | void |
f7342052 | 1231 | do_setusercontext(struct passwd *pw) |
1232 | { | |
2731632a | 1233 | #ifndef HAVE_CYGWIN |
1234 | if (getuid() == 0 || geteuid() == 0) | |
f7342052 | 1235 | #endif /* HAVE_CYGWIN */ |
2731632a | 1236 | { |
1237 | ||
8bbfc882 | 1238 | #ifdef HAVE_SETPCRED |
166baacc | 1239 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1240 | fatal("Failed to set process credentials"); | |
8bbfc882 | 1241 | #endif /* HAVE_SETPCRED */ |
f7342052 | 1242 | #ifdef HAVE_LOGIN_CAP |
2d199535 | 1243 | # ifdef __bsdi__ |
8695f9f7 | 1244 | setpgid(0, 0); |
2d199535 | 1245 | # endif |
f7342052 | 1246 | if (setusercontext(lc, pw, pw->pw_uid, |
1247 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1248 | perror("unable to set user context"); | |
1249 | exit(1); | |
1250 | } | |
1251 | #else | |
1252 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1253 | /* Sets login uid for accounting */ | |
1254 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1255 | error("setluid: %s", strerror(errno)); | |
1256 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1257 | ||
1258 | if (setlogin(pw->pw_name) < 0) | |
1259 | error("setlogin failed: %s", strerror(errno)); | |
1260 | if (setgid(pw->pw_gid) < 0) { | |
1261 | perror("setgid"); | |
1262 | exit(1); | |
1263 | } | |
1264 | /* Initialize the group list. */ | |
1265 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1266 | perror("initgroups"); | |
1267 | exit(1); | |
1268 | } | |
1269 | endgrent(); | |
1270 | # ifdef USE_PAM | |
1271 | /* | |
aff51935 | 1272 | * PAM credentials may take the form of supplementary groups. |
f7342052 | 1273 | * These will have been wiped by the above initgroups() call. |
1274 | * Reestablish them here. | |
1275 | */ | |
49e82bb9 | 1276 | if (options.use_pam) { |
1277 | do_pam_session(); | |
7fceb20d | 1278 | do_pam_setcred(0); |
49e82bb9 | 1279 | } |
f7342052 | 1280 | # endif /* USE_PAM */ |
1281 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1282 | irix_setusercontext(pw); | |
1283 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
e2bc41f9 | 1284 | # ifdef _AIX |
0ba40daa | 1285 | aix_usrinfo(pw); |
e2bc41f9 | 1286 | # endif /* _AIX */ |
f7342052 | 1287 | /* Permanently switch to the desired uid. */ |
1288 | permanently_set_uid(pw); | |
1289 | #endif | |
1290 | } | |
2731632a | 1291 | |
1292 | #ifdef HAVE_CYGWIN | |
1293 | if (is_winnt) | |
1294 | #endif | |
f7342052 | 1295 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1296 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1297 | } | |
1298 | ||
51aeb639 | 1299 | static void |
1853d1ef | 1300 | launch_login(struct passwd *pw, const char *hostname) |
1301 | { | |
1302 | /* Launch login(1). */ | |
1303 | ||
85cc9118 | 1304 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1305 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1306 | (s->term ? s->term : "unknown"), |
1853d1ef | 1307 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1308 | #ifdef LOGIN_NO_ENDOPT |
1309 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1310 | #else | |
1853d1ef | 1311 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1312 | #endif |
1853d1ef | 1313 | |
1314 | /* Login couldn't be executed, die. */ | |
1315 | ||
1316 | perror("login"); | |
1317 | exit(1); | |
1318 | } | |
1319 | ||
f7342052 | 1320 | /* |
1321 | * Performs common processing for the child, such as setting up the | |
1322 | * environment, closing extra file descriptors, setting the user and group | |
1323 | * ids, and executing the command or shell. | |
1324 | */ | |
1325 | void | |
1326 | do_child(Session *s, const char *command) | |
1327 | { | |
1328 | extern char **environ; | |
1329 | char **env; | |
1330 | char *argv[10]; | |
1331 | const char *shell, *shell0, *hostname = NULL; | |
1332 | struct passwd *pw = s->pw; | |
1333 | u_int i; | |
1334 | ||
1335 | /* remove hostkey from the child's memory */ | |
1336 | destroy_sensitive_data(); | |
1337 | ||
1338 | /* login(1) is only called if we execute the login shell */ | |
1339 | if (options.use_login && command != NULL) | |
1340 | options.use_login = 0; | |
1341 | ||
ef51930f | 1342 | #ifdef _UNICOS |
1343 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1344 | #endif /* _UNICOS */ | |
1345 | ||
f7342052 | 1346 | /* |
1347 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1348 | * switch, so we let login(1) to this for us. | |
1349 | */ | |
1350 | if (!options.use_login) { | |
1351 | #ifdef HAVE_OSF_SIA | |
58d0df4e | 1352 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
f7342052 | 1353 | if (!check_quietlogin(s, command)) |
1354 | do_motd(); | |
1355 | #else /* HAVE_OSF_SIA */ | |
1356 | do_nologin(pw); | |
1357 | do_setusercontext(pw); | |
1358 | #endif /* HAVE_OSF_SIA */ | |
1359 | } | |
1360 | ||
1361 | /* | |
1362 | * Get the shell from the password data. An empty shell field is | |
1363 | * legal, and means /bin/sh. | |
1364 | */ | |
1365 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
32214c88 | 1366 | |
1367 | /* | |
1368 | * Make sure $SHELL points to the shell from the password file, | |
1369 | * even if shell is overridden from login.conf | |
1370 | */ | |
1371 | env = do_setup_env(s, shell); | |
1372 | ||
f7342052 | 1373 | #ifdef HAVE_LOGIN_CAP |
1374 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1375 | #endif | |
1376 | ||
2e73a022 | 1377 | /* we have to stash the hostname before we close our socket. */ |
1378 | if (options.use_login) | |
46e3af7f | 1379 | hostname = get_remote_name_or_ip(utmp_len, |
c5a7d788 | 1380 | options.use_dns); |
7368a6c8 | 1381 | /* |
1382 | * Close the connection descriptors; note that this is the child, and | |
1383 | * the server will still have the socket open, and it is important | |
1384 | * that we do not shutdown it. Note that the descriptors cannot be | |
1385 | * closed before building the environment, as we call | |
1386 | * get_remote_ipaddr there. | |
1387 | */ | |
1388 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1389 | close(packet_get_connection_in()); | |
1390 | else { | |
1391 | close(packet_get_connection_in()); | |
1392 | close(packet_get_connection_out()); | |
1393 | } | |
1394 | /* | |
1395 | * Close all descriptors related to channels. They will still remain | |
1396 | * open in the parent. | |
1397 | */ | |
1398 | /* XXX better use close-on-exec? -markus */ | |
1399 | channel_close_all(); | |
1400 | ||
1401 | /* | |
1402 | * Close any extra file descriptors. Note that there may still be | |
1403 | * descriptors left by system functions. They will be closed later. | |
1404 | */ | |
1405 | endpwent(); | |
1406 | ||
1407 | /* | |
1408 | * Close any extra open file descriptors so that we don\'t have them | |
1409 | * hanging around in clients. Note that we want to do this after | |
1410 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1411 | * descriptors open. | |
1412 | */ | |
1413 | for (i = 3; i < 64; i++) | |
1414 | close(i); | |
1415 | ||
7368a6c8 | 1416 | /* |
2a8a6488 | 1417 | * Must take new environment into use so that .ssh/rc, |
1418 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1419 | */ |
1420 | environ = env; | |
1421 | ||
6704d19a | 1422 | #if defined(KRB5) && defined(AFS) |
a1e30b47 | 1423 | /* |
1424 | * At this point, we check to see if AFS is active and if we have | |
1425 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1426 | * if we can (and need to) extend the ticket into an AFS token. If | |
1427 | * we don't do this, we run into potential problems if the user's | |
1428 | * home directory is in AFS and it's not world-readable. | |
1429 | */ | |
1430 | ||
1431 | if (options.kerberos_get_afs_token && k_hasafs() && | |
1432 | (s->authctxt->krb5_ctx != NULL)) { | |
1433 | char cell[64]; | |
1434 | ||
1435 | debug("Getting AFS token"); | |
1436 | ||
1437 | k_setpag(); | |
1438 | ||
1439 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1440 | krb5_afslog(s->authctxt->krb5_ctx, | |
1441 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1442 | ||
1443 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1444 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1445 | } | |
1446 | #endif | |
1447 | ||
dab89049 | 1448 | /* Change current directory to the user\'s home directory. */ |
1449 | if (chdir(pw->pw_dir) < 0) { | |
1450 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1451 | pw->pw_dir, strerror(errno)); | |
1452 | #ifdef HAVE_LOGIN_CAP | |
1453 | if (login_getcapbool(lc, "requirehome", 0)) | |
1454 | exit(1); | |
1455 | #endif | |
1456 | } | |
1457 | ||
f7342052 | 1458 | if (!options.use_login) |
1459 | do_rc_files(s, shell); | |
1d3c30db | 1460 | |
1461 | /* restore SIGPIPE for child */ | |
1462 | signal(SIGPIPE, SIG_DFL); | |
1463 | ||
f7342052 | 1464 | if (options.use_login) { |
1853d1ef | 1465 | launch_login(pw, hostname); |
1466 | /* NEVERREACHED */ | |
f7342052 | 1467 | } |
1468 | ||
1469 | /* Get the last component of the shell name. */ | |
1470 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1471 | shell0++; | |
1472 | else | |
1473 | shell0 = shell; | |
1474 | ||
7368a6c8 | 1475 | /* |
1476 | * If we have no command, execute the shell. In this case, the shell | |
1477 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1478 | * this is a login shell. | |
1479 | */ | |
1480 | if (!command) { | |
f7342052 | 1481 | char argv0[256]; |
7368a6c8 | 1482 | |
f7342052 | 1483 | /* Start the shell. Set initial character to '-'. */ |
1484 | argv0[0] = '-'; | |
7368a6c8 | 1485 | |
f7342052 | 1486 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1487 | >= sizeof(argv0) - 1) { | |
1488 | errno = EINVAL; | |
7368a6c8 | 1489 | perror(shell); |
1490 | exit(1); | |
f7342052 | 1491 | } |
7368a6c8 | 1492 | |
f7342052 | 1493 | /* Execute the shell. */ |
1494 | argv[0] = argv0; | |
1495 | argv[1] = NULL; | |
1496 | execve(shell, argv, env); | |
7368a6c8 | 1497 | |
f7342052 | 1498 | /* Executing the shell failed. */ |
1499 | perror(shell); | |
1500 | exit(1); | |
7368a6c8 | 1501 | } |
1502 | /* | |
1503 | * Execute the command using the user's shell. This uses the -c | |
1504 | * option to execute the command. | |
1505 | */ | |
f7342052 | 1506 | argv[0] = (char *) shell0; |
7368a6c8 | 1507 | argv[1] = "-c"; |
1508 | argv[2] = (char *) command; | |
1509 | argv[3] = NULL; | |
1510 | execve(shell, argv, env); | |
1511 | perror(shell); | |
1512 | exit(1); | |
1513 | } | |
1514 | ||
1515 | Session * | |
1516 | session_new(void) | |
1517 | { | |
1518 | int i; | |
1519 | static int did_init = 0; | |
1520 | if (!did_init) { | |
1521 | debug("session_new: init"); | |
184eed6a | 1522 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1523 | sessions[i].used = 0; |
7368a6c8 | 1524 | } |
1525 | did_init = 1; | |
1526 | } | |
184eed6a | 1527 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1528 | Session *s = &sessions[i]; |
1529 | if (! s->used) { | |
690d0d7f | 1530 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1531 | s->chanid = -1; |
1532 | s->ptyfd = -1; | |
1533 | s->ttyfd = -1; | |
7368a6c8 | 1534 | s->used = 1; |
86066315 | 1535 | s->self = i; |
02323c45 | 1536 | debug("session_new: session %d", i); |
7368a6c8 | 1537 | return s; |
1538 | } | |
1539 | } | |
1540 | return NULL; | |
1541 | } | |
1542 | ||
396c147e | 1543 | static void |
7368a6c8 | 1544 | session_dump(void) |
1545 | { | |
1546 | int i; | |
184eed6a | 1547 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1548 | Session *s = &sessions[i]; |
c457707e | 1549 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1550 | s->used, |
1551 | s->self, | |
1552 | s, | |
1553 | s->chanid, | |
c457707e | 1554 | (long)s->pid); |
7368a6c8 | 1555 | } |
1556 | } | |
1557 | ||
e78a59f5 | 1558 | int |
57156994 | 1559 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1560 | { |
1561 | Session *s = session_new(); | |
1562 | debug("session_open: channel %d", chanid); | |
1563 | if (s == NULL) { | |
1564 | error("no more sessions"); | |
1565 | return 0; | |
1566 | } | |
57156994 | 1567 | s->authctxt = authctxt; |
1568 | s->pw = authctxt->pw; | |
fdaef11e | 1569 | if (s->pw == NULL || !authctxt->valid) |
0725ea77 | 1570 | fatal("no user for session %d", s->self); |
0b242b12 | 1571 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1572 | s->chanid = chanid; | |
e78a59f5 | 1573 | return 1; |
1574 | } | |
1575 | ||
1853d1ef | 1576 | Session * |
1577 | session_by_tty(char *tty) | |
1578 | { | |
1579 | int i; | |
1580 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1581 | Session *s = &sessions[i]; | |
1582 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1583 | debug("session_by_tty: session %d tty %s", i, tty); | |
1584 | return s; | |
1585 | } | |
1586 | } | |
1587 | debug("session_by_tty: unknown tty %.100s", tty); | |
1588 | session_dump(); | |
1589 | return NULL; | |
1590 | } | |
1591 | ||
396c147e | 1592 | static Session * |
e78a59f5 | 1593 | session_by_channel(int id) |
1594 | { | |
1595 | int i; | |
184eed6a | 1596 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1597 | Session *s = &sessions[i]; |
1598 | if (s->used && s->chanid == id) { | |
1599 | debug("session_by_channel: session %d channel %d", i, id); | |
1600 | return s; | |
1601 | } | |
1602 | } | |
1603 | debug("session_by_channel: unknown channel %d", id); | |
1604 | session_dump(); | |
1605 | return NULL; | |
1606 | } | |
1607 | ||
396c147e | 1608 | static Session * |
e78a59f5 | 1609 | session_by_pid(pid_t pid) |
1610 | { | |
1611 | int i; | |
c457707e | 1612 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1613 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1614 | Session *s = &sessions[i]; |
1615 | if (s->used && s->pid == pid) | |
1616 | return s; | |
1617 | } | |
c457707e | 1618 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1619 | session_dump(); |
1620 | return NULL; | |
1621 | } | |
1622 | ||
396c147e | 1623 | static int |
e78a59f5 | 1624 | session_window_change_req(Session *s) |
1625 | { | |
1626 | s->col = packet_get_int(); | |
1627 | s->row = packet_get_int(); | |
1628 | s->xpixel = packet_get_int(); | |
1629 | s->ypixel = packet_get_int(); | |
95500969 | 1630 | packet_check_eom(); |
e78a59f5 | 1631 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1632 | return 1; | |
1633 | } | |
1634 | ||
396c147e | 1635 | static int |
e78a59f5 | 1636 | session_pty_req(Session *s) |
1637 | { | |
1e3b8b07 | 1638 | u_int len; |
30dcc918 | 1639 | int n_bytes; |
762715ce | 1640 | |
653d5f86 | 1641 | if (no_pty_flag) { |
1642 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1643 | return 0; |
653d5f86 | 1644 | } |
1645 | if (s->ttyfd != -1) { | |
1646 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1647 | return 0; |
653d5f86 | 1648 | } |
ffbf7323 | 1649 | /* Get the time and hostname when the user last logged in. */ |
1650 | if (options.print_lastlog) { | |
1651 | s->hostname[0] = '\0'; | |
1652 | s->last_login_time = get_last_login_time(s->pw->pw_uid, | |
1653 | s->pw->pw_name, s->hostname, sizeof(s->hostname)); | |
1654 | } | |
653d5f86 | 1655 | |
e78a59f5 | 1656 | s->term = packet_get_string(&len); |
653d5f86 | 1657 | |
1658 | if (compat20) { | |
1659 | s->col = packet_get_int(); | |
1660 | s->row = packet_get_int(); | |
1661 | } else { | |
1662 | s->row = packet_get_int(); | |
1663 | s->col = packet_get_int(); | |
1664 | } | |
e78a59f5 | 1665 | s->xpixel = packet_get_int(); |
1666 | s->ypixel = packet_get_int(); | |
1667 | ||
1668 | if (strcmp(s->term, "") == 0) { | |
1669 | xfree(s->term); | |
1670 | s->term = NULL; | |
1671 | } | |
653d5f86 | 1672 | |
e78a59f5 | 1673 | /* Allocate a pty and open it. */ |
653d5f86 | 1674 | debug("Allocating pty."); |
1853d1ef | 1675 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1676 | if (s->term) |
1677 | xfree(s->term); | |
e78a59f5 | 1678 | s->term = NULL; |
1679 | s->ptyfd = -1; | |
1680 | s->ttyfd = -1; | |
1681 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1682 | return 0; |
e78a59f5 | 1683 | } |
1684 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1685 | |
1686 | /* for SSH1 the tty modes length is not given */ | |
1687 | if (!compat20) | |
1688 | n_bytes = packet_remaining(); | |
1689 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1690 | ||
1853d1ef | 1691 | if (!use_privsep) |
1692 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1693 | |
1694 | /* Set window size from the packet. */ | |
e78a59f5 | 1695 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1696 | ||
95500969 | 1697 | packet_check_eom(); |
1d1ffb87 | 1698 | session_proctitle(s); |
e78a59f5 | 1699 | return 1; |
1700 | } | |
1701 | ||
396c147e | 1702 | static int |
0b242b12 | 1703 | session_subsystem_req(Session *s) |
1704 | { | |
01855277 | 1705 | struct stat st; |
1e3b8b07 | 1706 | u_int len; |
0b242b12 | 1707 | int success = 0; |
01855277 | 1708 | char *cmd, *subsys = packet_get_string(&len); |
38c295d6 | 1709 | int i; |
0b242b12 | 1710 | |
95500969 | 1711 | packet_check_eom(); |
bbe88b6d | 1712 | logit("subsystem request for %.100s", subsys); |
0b242b12 | 1713 | |
38c295d6 | 1714 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1715 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
1716 | cmd = options.subsystem_command[i]; | |
1717 | if (stat(cmd, &st) < 0) { | |
1718 | error("subsystem: cannot stat %s: %s", cmd, | |
1719 | strerror(errno)); | |
1720 | break; | |
1721 | } | |
1722 | debug("subsystem: exec() %s", cmd); | |
e5d7a405 | 1723 | s->is_subsystem = 1; |
01855277 | 1724 | do_exec(s, cmd); |
38c295d6 | 1725 | success = 1; |
24932ee9 | 1726 | break; |
38c295d6 | 1727 | } |
1728 | } | |
1729 | ||
1730 | if (!success) | |
bbe88b6d | 1731 | logit("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1732 | subsys); |
38c295d6 | 1733 | |
0b242b12 | 1734 | xfree(subsys); |
1735 | return success; | |
1736 | } | |
1737 | ||
396c147e | 1738 | static int |
0b242b12 | 1739 | session_x11_req(Session *s) |
1740 | { | |
8dcd9d5c | 1741 | int success; |
0b242b12 | 1742 | |
1743 | s->single_connection = packet_get_char(); | |
1744 | s->auth_proto = packet_get_string(NULL); | |
1745 | s->auth_data = packet_get_string(NULL); | |
1746 | s->screen = packet_get_int(); | |
95500969 | 1747 | packet_check_eom(); |
0b242b12 | 1748 | |
8dcd9d5c | 1749 | success = session_setup_x11fwd(s); |
1750 | if (!success) { | |
0b242b12 | 1751 | xfree(s->auth_proto); |
1752 | xfree(s->auth_data); | |
1500bcdd | 1753 | s->auth_proto = NULL; |
1754 | s->auth_data = NULL; | |
0b242b12 | 1755 | } |
8dcd9d5c | 1756 | return success; |
0b242b12 | 1757 | } |
1758 | ||
396c147e | 1759 | static int |
38c295d6 | 1760 | session_shell_req(Session *s) |
1761 | { | |
95500969 | 1762 | packet_check_eom(); |
dac6753b | 1763 | do_exec(s, NULL); |
38c295d6 | 1764 | return 1; |
1765 | } | |
1766 | ||
396c147e | 1767 | static int |
38c295d6 | 1768 | session_exec_req(Session *s) |
1769 | { | |
1e3b8b07 | 1770 | u_int len; |
38c295d6 | 1771 | char *command = packet_get_string(&len); |
95500969 | 1772 | packet_check_eom(); |
dac6753b | 1773 | do_exec(s, command); |
c95add71 | 1774 | xfree(command); |
38c295d6 | 1775 | return 1; |
1776 | } | |
1777 | ||
16a79097 | 1778 | static int |
1779 | session_break_req(Session *s) | |
1780 | { | |
1781 | u_int break_length; | |
1782 | ||
8168a86a | 1783 | break_length = packet_get_int(); /* ignored */ |
16a79097 | 1784 | packet_check_eom(); |
1785 | ||
8168a86a | 1786 | if (s->ttyfd == -1 || |
1787 | tcsendbreak(s->ttyfd, 0) < 0) | |
16a79097 | 1788 | return 0; |
16a79097 | 1789 | return 1; |
1790 | } | |
1791 | ||
396c147e | 1792 | static int |
fa08c86b | 1793 | session_auth_agent_req(Session *s) |
1794 | { | |
1795 | static int called = 0; | |
95500969 | 1796 | packet_check_eom(); |
d343d900 | 1797 | if (no_agent_forwarding_flag) { |
1798 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1799 | return 0; | |
1800 | } | |
fa08c86b | 1801 | if (called) { |
1802 | return 0; | |
1803 | } else { | |
1804 | called = 1; | |
1805 | return auth_input_request_forwarding(s->pw); | |
1806 | } | |
1807 | } | |
1808 | ||
7899c98f | 1809 | int |
1810 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 1811 | { |
e78a59f5 | 1812 | int success = 0; |
e78a59f5 | 1813 | Session *s; |
e78a59f5 | 1814 | |
7899c98f | 1815 | if ((s = session_by_channel(c->self)) == NULL) { |
bbe88b6d | 1816 | logit("session_input_channel_req: no session %d req %.100s", |
7899c98f | 1817 | c->self, rtype); |
1818 | return 0; | |
1819 | } | |
1820 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 1821 | |
1822 | /* | |
e5d7a405 | 1823 | * a session is in LARVAL state until a shell, a command |
1824 | * or a subsystem is executed | |
e78a59f5 | 1825 | */ |
1826 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1827 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1828 | success = session_shell_req(s); |
e78a59f5 | 1829 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1830 | success = session_exec_req(s); |
e78a59f5 | 1831 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1832 | success = session_pty_req(s); |
0b242b12 | 1833 | } else if (strcmp(rtype, "x11-req") == 0) { |
1834 | success = session_x11_req(s); | |
fa08c86b | 1835 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1836 | success = session_auth_agent_req(s); | |
0b242b12 | 1837 | } else if (strcmp(rtype, "subsystem") == 0) { |
1838 | success = session_subsystem_req(s); | |
16a79097 | 1839 | } else if (strcmp(rtype, "break") == 0) { |
1840 | success = session_break_req(s); | |
e78a59f5 | 1841 | } |
1842 | } | |
1843 | if (strcmp(rtype, "window-change") == 0) { | |
1844 | success = session_window_change_req(s); | |
1845 | } | |
7899c98f | 1846 | return success; |
e78a59f5 | 1847 | } |
1848 | ||
1849 | void | |
1850 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1851 | { | |
1852 | if (!compat20) | |
1853 | fatal("session_set_fds: called for proto != 2.0"); | |
1854 | /* | |
1855 | * now that have a child and a pipe to the child, | |
1856 | * we can activate our channel and register the fd's | |
1857 | */ | |
1858 | if (s->chanid == -1) | |
1859 | fatal("no channel for session %d", s->self); | |
1860 | channel_set_fds(s->chanid, | |
1861 | fdout, fdin, fderr, | |
a22aff1f | 1862 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 1863 | 1, |
1864 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 1865 | } |
1866 | ||
86066315 | 1867 | /* |
1868 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
1869 | * (e.g., due to a dropped connection). | |
1870 | */ | |
1853d1ef | 1871 | void |
2362db19 | 1872 | session_pty_cleanup2(Session *s) |
7368a6c8 | 1873 | { |
86066315 | 1874 | if (s == NULL) { |
1875 | error("session_pty_cleanup: no session"); | |
1876 | return; | |
1877 | } | |
1878 | if (s->ttyfd == -1) | |
7368a6c8 | 1879 | return; |
1880 | ||
0725ea77 | 1881 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 1882 | |
7368a6c8 | 1883 | /* Record that the user has logged out. */ |
86066315 | 1884 | if (s->pid != 0) |
f3837bc6 | 1885 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 1886 | |
1887 | /* Release the pseudo-tty. */ | |
1853d1ef | 1888 | if (getuid() == 0) |
1889 | pty_release(s->tty); | |
7368a6c8 | 1890 | |
1891 | /* | |
1892 | * Close the server side of the socket pairs. We must do this after | |
1893 | * the pty cleanup, so that another process doesn't get this pty | |
1894 | * while we're still cleaning up. | |
1895 | */ | |
1896 | if (close(s->ptymaster) < 0) | |
1853d1ef | 1897 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 1898 | |
1899 | /* unlink pty from session */ | |
1900 | s->ttyfd = -1; | |
7368a6c8 | 1901 | } |
e78a59f5 | 1902 | |
1853d1ef | 1903 | void |
2362db19 | 1904 | session_pty_cleanup(Session *s) |
1853d1ef | 1905 | { |
2362db19 | 1906 | PRIVSEP(session_pty_cleanup2(s)); |
1853d1ef | 1907 | } |
1908 | ||
6c723e7c | 1909 | static char * |
1910 | sig2name(int sig) | |
1911 | { | |
1912 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
1913 | SSH_SIG(ABRT); | |
1914 | SSH_SIG(ALRM); | |
1915 | SSH_SIG(FPE); | |
1916 | SSH_SIG(HUP); | |
1917 | SSH_SIG(ILL); | |
1918 | SSH_SIG(INT); | |
1919 | SSH_SIG(KILL); | |
1920 | SSH_SIG(PIPE); | |
1921 | SSH_SIG(QUIT); | |
1922 | SSH_SIG(SEGV); | |
1923 | SSH_SIG(TERM); | |
1924 | SSH_SIG(USR1); | |
1925 | SSH_SIG(USR2); | |
1926 | #undef SSH_SIG | |
1927 | return "SIG@openssh.com"; | |
1928 | } | |
1929 | ||
396c147e | 1930 | static void |
e78a59f5 | 1931 | session_exit_message(Session *s, int status) |
1932 | { | |
1933 | Channel *c; | |
5a4ae906 | 1934 | |
1935 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 1936 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 1937 | s->self, s->chanid); |
c457707e | 1938 | debug("session_exit_message: session %d channel %d pid %ld", |
1939 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 1940 | |
1941 | if (WIFEXITED(status)) { | |
5a4ae906 | 1942 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 1943 | packet_put_int(WEXITSTATUS(status)); |
1944 | packet_send(); | |
1945 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 1946 | channel_request_start(s->chanid, "exit-signal", 0); |
6c723e7c | 1947 | packet_put_cstring(sig2name(WTERMSIG(status))); |
a64009ad | 1948 | #ifdef WCOREDUMP |
e78a59f5 | 1949 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1950 | #else /* WCOREDUMP */ |
1951 | packet_put_char(0); | |
1952 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1953 | packet_put_cstring(""); |
1954 | packet_put_cstring(""); | |
1955 | packet_send(); | |
1956 | } else { | |
1957 | /* Some weird exit cause. Just exit. */ | |
1958 | packet_disconnect("wait returned status %04x.", status); | |
1959 | } | |
1960 | ||
1961 | /* disconnect channel */ | |
1962 | debug("session_exit_message: release channel %d", s->chanid); | |
1963 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1964 | /* |
1965 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1966 | * interested in data we write. | |
1967 | * Note that we must not call 'chan_read_failed', since there could | |
1968 | * be some more data waiting in the pipe. | |
1969 | */ | |
0b242b12 | 1970 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1971 | chan_write_failed(c); | |
e78a59f5 | 1972 | s->chanid = -1; |
1973 | } | |
1974 | ||
1853d1ef | 1975 | void |
86066315 | 1976 | session_close(Session *s) |
e78a59f5 | 1977 | { |
c457707e | 1978 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
2362db19 | 1979 | if (s->ttyfd != -1) |
86066315 | 1980 | session_pty_cleanup(s); |
e78a59f5 | 1981 | if (s->term) |
1982 | xfree(s->term); | |
1983 | if (s->display) | |
1984 | xfree(s->display); | |
f9314d9a | 1985 | if (s->auth_display) |
1986 | xfree(s->auth_display); | |
e78a59f5 | 1987 | if (s->auth_data) |
1988 | xfree(s->auth_data); | |
1989 | if (s->auth_proto) | |
1990 | xfree(s->auth_proto); | |
1991 | s->used = 0; | |
1d1ffb87 | 1992 | session_proctitle(s); |
e78a59f5 | 1993 | } |
1994 | ||
1995 | void | |
1996 | session_close_by_pid(pid_t pid, int status) | |
1997 | { | |
1998 | Session *s = session_by_pid(pid); | |
1999 | if (s == NULL) { | |
c457707e | 2000 | debug("session_close_by_pid: no session for pid %ld", |
2001 | (long)pid); | |
e78a59f5 | 2002 | return; |
2003 | } | |
2004 | if (s->chanid != -1) | |
2005 | session_exit_message(s, status); | |
2006 | session_close(s); | |
2007 | } | |
2008 | ||
2009 | /* | |
2010 | * this is called when a channel dies before | |
2011 | * the session 'child' itself dies | |
2012 | */ | |
2013 | void | |
2014 | session_close_by_channel(int id, void *arg) | |
2015 | { | |
2016 | Session *s = session_by_channel(id); | |
2017 | if (s == NULL) { | |
418e724c | 2018 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 2019 | return; |
2020 | } | |
c457707e | 2021 | debug("session_close_by_channel: channel %d child %ld", |
2022 | id, (long)s->pid); | |
d5f24f94 | 2023 | if (s->pid != 0) { |
418e724c | 2024 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 2025 | /* |
2026 | * delay detach of session, but release pty, since | |
2027 | * the fd's to the child are already closed | |
2028 | */ | |
2362db19 | 2029 | if (s->ttyfd != -1) |
efcc9957 | 2030 | session_pty_cleanup(s); |
418e724c | 2031 | return; |
e78a59f5 | 2032 | } |
418e724c | 2033 | /* detach by removing callback */ |
2034 | channel_cancel_cleanup(s->chanid); | |
2035 | s->chanid = -1; | |
d5f24f94 | 2036 | session_close(s); |
2037 | } | |
2038 | ||
2039 | void | |
1853d1ef | 2040 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 2041 | { |
2042 | int i; | |
184eed6a | 2043 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 2044 | Session *s = &sessions[i]; |
1853d1ef | 2045 | if (s->used) { |
2046 | if (closefunc != NULL) | |
2047 | closefunc(s); | |
2048 | else | |
2049 | session_close(s); | |
2050 | } | |
d5f24f94 | 2051 | } |
e78a59f5 | 2052 | } |
2053 | ||
396c147e | 2054 | static char * |
1d1ffb87 | 2055 | session_tty_list(void) |
2056 | { | |
2057 | static char buf[1024]; | |
2058 | int i; | |
d0104542 | 2059 | char *cp; |
2060 | ||
1d1ffb87 | 2061 | buf[0] = '\0'; |
184eed6a | 2062 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 2063 | Session *s = &sessions[i]; |
2064 | if (s->used && s->ttyfd != -1) { | |
b6453d99 | 2065 | |
d0104542 | 2066 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2067 | cp = strrchr(s->tty, '/'); | |
2068 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2069 | } else | |
2070 | cp = s->tty + 5; | |
b6453d99 | 2071 | |
1d1ffb87 | 2072 | if (buf[0] != '\0') |
2073 | strlcat(buf, ",", sizeof buf); | |
d0104542 | 2074 | strlcat(buf, cp, sizeof buf); |
1d1ffb87 | 2075 | } |
2076 | } | |
2077 | if (buf[0] == '\0') | |
2078 | strlcpy(buf, "notty", sizeof buf); | |
2079 | return buf; | |
2080 | } | |
2081 | ||
2082 | void | |
2083 | session_proctitle(Session *s) | |
2084 | { | |
2085 | if (s->pw == NULL) | |
2086 | error("no user for session %d", s->self); | |
2087 | else | |
2088 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2089 | } | |
2090 | ||
8dcd9d5c | 2091 | int |
2092 | session_setup_x11fwd(Session *s) | |
2093 | { | |
8dcd9d5c | 2094 | struct stat st; |
c9d0ad9b | 2095 | char display[512], auth_display[512]; |
2096 | char hostname[MAXHOSTNAMELEN]; | |
8dcd9d5c | 2097 | |
2098 | if (no_x11_forwarding_flag) { | |
2099 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2100 | return 0; | |
2101 | } | |
2102 | if (!options.x11_forwarding) { | |
2103 | debug("X11 forwarding disabled in server configuration file."); | |
2104 | return 0; | |
2105 | } | |
2106 | if (!options.xauth_location || | |
2107 | (stat(options.xauth_location, &st) == -1)) { | |
2108 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2109 | return 0; | |
2110 | } | |
ff027d84 | 2111 | if (options.use_login) { |
2112 | packet_send_debug("X11 forwarding disabled; " | |
2113 | "not compatible with UseLogin=yes."); | |
2114 | return 0; | |
2115 | } | |
b44de2b1 | 2116 | if (s->display != NULL) { |
8dcd9d5c | 2117 | debug("X11 display already set."); |
2118 | return 0; | |
2119 | } | |
57f228e8 | 2120 | if (x11_create_display_inet(options.x11_display_offset, |
2121 | options.x11_use_localhost, s->single_connection, | |
2122 | &s->display_number) == -1) { | |
b44de2b1 | 2123 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 2124 | return 0; |
2125 | } | |
c9d0ad9b | 2126 | |
2127 | /* Set up a suitable value for the DISPLAY variable. */ | |
2128 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2129 | fatal("gethostname: %.100s", strerror(errno)); | |
2130 | /* | |
2131 | * auth_display must be used as the displayname when the | |
2132 | * authorization entry is added with xauth(1). This will be | |
2133 | * different than the DISPLAY string for localhost displays. | |
2134 | */ | |
e6e573bd | 2135 | if (options.x11_use_localhost) { |
57f228e8 | 2136 | snprintf(display, sizeof display, "localhost:%u.%u", |
c9d0ad9b | 2137 | s->display_number, s->screen); |
57f228e8 | 2138 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
f9314d9a | 2139 | s->display_number, s->screen); |
c9d0ad9b | 2140 | s->display = xstrdup(display); |
f9314d9a | 2141 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 2142 | } else { |
2143 | #ifdef IPADDR_IN_DISPLAY | |
2144 | struct hostent *he; | |
2145 | struct in_addr my_addr; | |
2146 | ||
2147 | he = gethostbyname(hostname); | |
2148 | if (he == NULL) { | |
2149 | error("Can't get IP address for X11 DISPLAY."); | |
2150 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2151 | return 0; | |
2152 | } | |
2153 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
57f228e8 | 2154 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
c9d0ad9b | 2155 | s->display_number, s->screen); |
2156 | #else | |
57f228e8 | 2157 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
c9d0ad9b | 2158 | s->display_number, s->screen); |
2159 | #endif | |
2160 | s->display = xstrdup(display); | |
f9314d9a | 2161 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2162 | } |
2163 | ||
8dcd9d5c | 2164 | return 1; |
2165 | } | |
2166 | ||
396c147e | 2167 | static void |
59c97189 | 2168 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2169 | { |
57156994 | 2170 | server_loop2(authctxt); |
2362db19 | 2171 | } |
2172 | ||
2173 | void | |
2174 | do_cleanup(Authctxt *authctxt) | |
2175 | { | |
2176 | static int called = 0; | |
2177 | ||
2178 | debug("do_cleanup"); | |
2179 | ||
2180 | /* no cleanup if we're in the child for login shell */ | |
2181 | if (is_child) | |
2182 | return; | |
2183 | ||
2184 | /* avoid double cleanup */ | |
2185 | if (called) | |
2186 | return; | |
2187 | called = 1; | |
2188 | ||
2189 | if (authctxt == NULL) | |
2190 | return; | |
2191 | #ifdef KRB5 | |
2192 | if (options.kerberos_ticket_cleanup && | |
2193 | authctxt->krb5_ctx) | |
2194 | krb5_cleanup_proc(authctxt); | |
7364bd04 | 2195 | #endif |
2362db19 | 2196 | |
2197 | #ifdef GSSAPI | |
2198 | if (compat20 && options.gss_cleanup_creds) | |
2199 | ssh_gssapi_cleanup_creds(); | |
2200 | #endif | |
2201 | ||
c6630044 | 2202 | #ifdef USE_PAM |
2203 | if (options.use_pam) { | |
2204 | sshpam_cleanup(); | |
2205 | sshpam_thread_cleanup(); | |
2206 | } | |
2207 | #endif | |
2208 | ||
2362db19 | 2209 | /* remove agent socket */ |
2210 | auth_sock_cleanup_proc(authctxt->pw); | |
2211 | ||
2212 | /* | |
2213 | * Cleanup ptys/utmp only if privsep is disabled, | |
2214 | * or if running in monitor. | |
2215 | */ | |
2216 | if (!use_privsep || mm_is_monitor()) | |
2217 | session_destroy_all(session_pty_cleanup2); | |
e78a59f5 | 2218 | } |