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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" | |
3e2f2431 | 36 | RCSID("$OpenBSD: session.c,v 1.154 2003/03/05 22:33:43 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 | |
3c62e7eb | 61 | #ifdef HAVE_CYGWIN |
62 | #include <windows.h> | |
63 | #include <sys/cygwin.h> | |
64 | #define is_winnt (GetVersion() < 0x80000000) | |
65 | #endif | |
66 | ||
7368a6c8 | 67 | /* func */ |
68 | ||
69 | Session *session_new(void); | |
9c328529 | 70 | void session_set_fds(Session *, int, int, int); |
1853d1ef | 71 | void session_pty_cleanup(void *); |
9c328529 | 72 | void session_proctitle(Session *); |
73 | int session_setup_x11fwd(Session *); | |
74 | void do_exec_pty(Session *, const char *); | |
75 | void do_exec_no_pty(Session *, const char *); | |
76 | void do_exec(Session *, const char *); | |
77 | void do_login(Session *, const char *); | |
8a9ac95d | 78 | #ifdef LOGIN_NEEDS_UTMPX |
79 | static void do_pre_login(Session *s); | |
80 | #endif | |
9c328529 | 81 | void do_child(Session *, const char *); |
f2c2fd71 | 82 | void do_motd(void); |
9c328529 | 83 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 84 | |
396c147e | 85 | static void do_authenticated1(Authctxt *); |
86 | static void do_authenticated2(Authctxt *); | |
9c328529 | 87 | |
396c147e | 88 | static int session_pty_req(Session *); |
bb5639fe | 89 | |
7368a6c8 | 90 | /* import */ |
91 | extern ServerOptions options; | |
92 | extern char *__progname; | |
93 | extern int log_stderr; | |
94 | extern int debug_flag; | |
1e3b8b07 | 95 | extern u_int utmp_len; |
089fbbd2 | 96 | extern int startup_pipe; |
e78e738a | 97 | extern void destroy_sensitive_data(void); |
089fbbd2 | 98 | |
b5e300c2 | 99 | /* original command from peer. */ |
c95add71 | 100 | const char *original_command = NULL; |
b5e300c2 | 101 | |
7368a6c8 | 102 | /* data */ |
103 | #define MAX_SESSIONS 10 | |
104 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 105 | |
c1ef8333 | 106 | #ifdef WITH_AIXAUTHENTICATE |
c1ef8333 | 107 | char *aixloginmsg; |
108 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 109 | |
2e73a022 | 110 | #ifdef HAVE_LOGIN_CAP |
1836f69f | 111 | login_cap_t *lc; |
2e73a022 | 112 | #endif |
113 | ||
149cdb60 | 114 | /* Name and directory of socket for authentication agent forwarding. */ |
115 | static char *auth_sock_name = NULL; | |
116 | static char *auth_sock_dir = NULL; | |
117 | ||
118 | /* removes the agent forwarding socket */ | |
119 | ||
120 | static void | |
121 | auth_sock_cleanup_proc(void *_pw) | |
122 | { | |
123 | struct passwd *pw = _pw; | |
124 | ||
125 | if (auth_sock_name != NULL) { | |
126 | temporarily_use_uid(pw); | |
127 | unlink(auth_sock_name); | |
128 | rmdir(auth_sock_dir); | |
129 | auth_sock_name = NULL; | |
130 | restore_uid(); | |
131 | } | |
132 | } | |
133 | ||
134 | static int | |
135 | auth_input_request_forwarding(struct passwd * pw) | |
136 | { | |
137 | Channel *nc; | |
138 | int sock; | |
139 | struct sockaddr_un sunaddr; | |
140 | ||
141 | if (auth_sock_name != NULL) { | |
142 | error("authentication forwarding requested twice."); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
147 | temporarily_use_uid(pw); | |
148 | ||
149 | /* Allocate a buffer for the socket name, and format the name. */ | |
150 | auth_sock_name = xmalloc(MAXPATHLEN); | |
151 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
152 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
153 | ||
154 | /* Create private directory for socket */ | |
155 | if (mkdtemp(auth_sock_dir) == NULL) { | |
156 | packet_send_debug("Agent forwarding disabled: " | |
157 | "mkdtemp() failed: %.100s", strerror(errno)); | |
158 | restore_uid(); | |
159 | xfree(auth_sock_name); | |
160 | xfree(auth_sock_dir); | |
161 | auth_sock_name = NULL; | |
162 | auth_sock_dir = NULL; | |
163 | return 0; | |
164 | } | |
c457707e | 165 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
166 | auth_sock_dir, (long) getpid()); | |
149cdb60 | 167 | |
168 | /* delete agent socket on fatal() */ | |
169 | fatal_add_cleanup(auth_sock_cleanup_proc, pw); | |
170 | ||
171 | /* Create the socket. */ | |
172 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
173 | if (sock < 0) | |
174 | packet_disconnect("socket: %.100s", strerror(errno)); | |
175 | ||
176 | /* Bind it to the name. */ | |
177 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
178 | sunaddr.sun_family = AF_UNIX; | |
179 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
180 | ||
181 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
182 | packet_disconnect("bind: %.100s", strerror(errno)); | |
183 | ||
184 | /* Restore the privileged uid. */ | |
185 | restore_uid(); | |
186 | ||
187 | /* Start listening on the socket. */ | |
188 | if (listen(sock, 5) < 0) | |
189 | packet_disconnect("listen: %.100s", strerror(errno)); | |
190 | ||
191 | /* Allocate a channel for the authentication agent socket. */ | |
192 | nc = channel_new("auth socket", | |
193 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
194 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
195 | 0, xstrdup("auth socket"), 1); | |
196 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); | |
197 | return 1; | |
198 | } | |
199 | ||
200 | ||
bb5639fe | 201 | void |
202 | do_authenticated(Authctxt *authctxt) | |
203 | { | |
381b021b | 204 | setproctitle("%s", authctxt->pw->pw_name); |
205 | ||
bb5639fe | 206 | /* |
207 | * Cancel the alarm we set to limit the time taken for | |
208 | * authentication. | |
209 | */ | |
210 | alarm(0); | |
211 | if (startup_pipe != -1) { | |
212 | close(startup_pipe); | |
213 | startup_pipe = -1; | |
214 | } | |
19e810f6 | 215 | |
bb5639fe | 216 | /* setup the channel layer */ |
217 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
218 | channel_permit_all_opens(); | |
219 | ||
220 | if (compat20) | |
221 | do_authenticated2(authctxt); | |
222 | else | |
223 | do_authenticated1(authctxt); | |
e4f7282d | 224 | |
b44de2b1 | 225 | /* remove agent socket */ |
149cdb60 | 226 | if (auth_sock_name != NULL) |
f0f32b8e | 227 | auth_sock_cleanup_proc(authctxt->pw); |
ced49be2 | 228 | #ifdef KRB4 |
229 | if (options.kerberos_ticket_cleanup) | |
230 | krb4_cleanup_proc(authctxt); | |
231 | #endif | |
232 | #ifdef KRB5 | |
233 | if (options.kerberos_ticket_cleanup) | |
234 | krb5_cleanup_proc(authctxt); | |
235 | #endif | |
bb5639fe | 236 | } |
237 | ||
7368a6c8 | 238 | /* |
239 | * Prepares for an interactive session. This is called after the user has | |
240 | * been successfully authenticated. During this message exchange, pseudo | |
241 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
242 | * are requested, etc. | |
243 | */ | |
396c147e | 244 | static void |
bb5639fe | 245 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 246 | { |
247 | Session *s; | |
7368a6c8 | 248 | char *command; |
54a5250f | 249 | int success, type, screen_flag; |
7138ebd9 | 250 | int enable_compression_after_reply = 0; |
251 | u_int proto_len, data_len, dlen, compression_level = 0; | |
7368a6c8 | 252 | |
253 | s = session_new(); | |
ced49be2 | 254 | s->authctxt = authctxt; |
bb5639fe | 255 | s->pw = authctxt->pw; |
2e73a022 | 256 | |
7368a6c8 | 257 | /* |
258 | * We stay in this loop until the client requests to execute a shell | |
259 | * or a command. | |
260 | */ | |
261 | for (;;) { | |
bb5639fe | 262 | success = 0; |
7368a6c8 | 263 | |
264 | /* Get a packet from the client. */ | |
54a5250f | 265 | type = packet_read(); |
7368a6c8 | 266 | |
267 | /* Process the packet. */ | |
268 | switch (type) { | |
269 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 270 | compression_level = packet_get_int(); |
95500969 | 271 | packet_check_eom(); |
7368a6c8 | 272 | if (compression_level < 1 || compression_level > 9) { |
273 | packet_send_debug("Received illegal compression level %d.", | |
184eed6a | 274 | compression_level); |
7368a6c8 | 275 | break; |
276 | } | |
636f76ca | 277 | if (!options.compression) { |
278 | debug2("compression disabled"); | |
279 | break; | |
280 | } | |
7368a6c8 | 281 | /* Enable compression after we have responded with SUCCESS. */ |
282 | enable_compression_after_reply = 1; | |
283 | success = 1; | |
284 | break; | |
285 | ||
286 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 287 | success = session_pty_req(s); |
7368a6c8 | 288 | break; |
289 | ||
290 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 291 | s->auth_proto = packet_get_string(&proto_len); |
292 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 293 | |
2af09193 | 294 | screen_flag = packet_get_protocol_flags() & |
295 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
296 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
297 | ||
298 | if (packet_remaining() == 4) { | |
299 | if (!screen_flag) | |
300 | debug2("Buggy client: " | |
301 | "X11 screen flag missing"); | |
7368a6c8 | 302 | s->screen = packet_get_int(); |
c8b058b4 | 303 | } else { |
7368a6c8 | 304 | s->screen = 0; |
c8b058b4 | 305 | } |
95500969 | 306 | packet_check_eom(); |
8dcd9d5c | 307 | success = session_setup_x11fwd(s); |
308 | if (!success) { | |
309 | xfree(s->auth_proto); | |
310 | xfree(s->auth_data); | |
1500bcdd | 311 | s->auth_proto = NULL; |
312 | s->auth_data = NULL; | |
7368a6c8 | 313 | } |
7368a6c8 | 314 | break; |
7368a6c8 | 315 | |
316 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
317 | if (no_agent_forwarding_flag || compat13) { | |
318 | debug("Authentication agent forwarding not permitted for this authentication."); | |
319 | break; | |
320 | } | |
321 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 322 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 323 | break; |
324 | ||
325 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
326 | if (no_port_forwarding_flag) { | |
327 | debug("Port forwarding not permitted for this authentication."); | |
328 | break; | |
329 | } | |
33de75a3 | 330 | if (!options.allow_tcp_forwarding) { |
331 | debug("Port forwarding not permitted."); | |
332 | break; | |
333 | } | |
7368a6c8 | 334 | debug("Received TCP/IP port forwarding request."); |
bb5639fe | 335 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 336 | success = 1; |
337 | break; | |
338 | ||
339 | case SSH_CMSG_MAX_PACKET_SIZE: | |
340 | if (packet_set_maxsize(packet_get_int()) > 0) | |
341 | success = 1; | |
342 | break; | |
184eed6a | 343 | |
ced49be2 | 344 | #if defined(AFS) || defined(KRB5) |
345 | case SSH_CMSG_HAVE_KERBEROS_TGT: | |
346 | if (!options.kerberos_tgt_passing) { | |
347 | verbose("Kerberos TGT passing disabled."); | |
348 | } else { | |
349 | char *kdata = packet_get_string(&dlen); | |
95500969 | 350 | packet_check_eom(); |
184eed6a | 351 | |
ced49be2 | 352 | /* XXX - 0x41, see creds_to_radix version */ |
353 | if (kdata[0] != 0x41) { | |
354 | #ifdef KRB5 | |
355 | krb5_data tgt; | |
356 | tgt.data = kdata; | |
357 | tgt.length = dlen; | |
184eed6a | 358 | |
ced49be2 | 359 | if (auth_krb5_tgt(s->authctxt, &tgt)) |
360 | success = 1; | |
361 | else | |
362 | verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user); | |
363 | #endif /* KRB5 */ | |
364 | } else { | |
365 | #ifdef AFS | |
366 | if (auth_krb4_tgt(s->authctxt, kdata)) | |
367 | success = 1; | |
368 | else | |
369 | verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user); | |
370 | #endif /* AFS */ | |
371 | } | |
372 | xfree(kdata); | |
373 | } | |
374 | break; | |
375 | #endif /* AFS || KRB5 */ | |
184eed6a | 376 | |
ced49be2 | 377 | #ifdef AFS |
378 | case SSH_CMSG_HAVE_AFS_TOKEN: | |
379 | if (!options.afs_token_passing || !k_hasafs()) { | |
380 | verbose("AFS token passing disabled."); | |
381 | } else { | |
382 | /* Accept AFS token. */ | |
383 | char *token = packet_get_string(&dlen); | |
95500969 | 384 | packet_check_eom(); |
184eed6a | 385 | |
ced49be2 | 386 | if (auth_afs_token(s->authctxt, token)) |
387 | success = 1; | |
388 | else | |
389 | verbose("AFS token refused for %.100s", | |
390 | s->authctxt->user); | |
391 | xfree(token); | |
392 | } | |
393 | break; | |
394 | #endif /* AFS */ | |
7368a6c8 | 395 | |
396 | case SSH_CMSG_EXEC_SHELL: | |
397 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 398 | if (type == SSH_CMSG_EXEC_CMD) { |
399 | command = packet_get_string(&dlen); | |
400 | debug("Exec command '%.500s'", command); | |
c95add71 | 401 | do_exec(s, command); |
402 | xfree(command); | |
7368a6c8 | 403 | } else { |
c95add71 | 404 | do_exec(s, NULL); |
7368a6c8 | 405 | } |
95500969 | 406 | packet_check_eom(); |
fc2a1d28 | 407 | session_close(s); |
7368a6c8 | 408 | return; |
409 | ||
410 | default: | |
411 | /* | |
412 | * Any unknown messages in this phase are ignored, | |
413 | * and a failure message is returned. | |
414 | */ | |
415 | log("Unknown packet type received after authentication: %d", type); | |
416 | } | |
417 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
418 | packet_send(); | |
419 | packet_write_wait(); | |
420 | ||
421 | /* Enable compression now that we have replied if appropriate. */ | |
422 | if (enable_compression_after_reply) { | |
423 | enable_compression_after_reply = 0; | |
424 | packet_start_compression(compression_level); | |
425 | } | |
426 | } | |
427 | } | |
428 | ||
429 | /* | |
430 | * This is called to fork and execute a command when we have no tty. This | |
431 | * will call do_child from the child, and server_loop from the parent after | |
432 | * setting up file descriptors and such. | |
433 | */ | |
6ae2364d | 434 | void |
65068d16 | 435 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 436 | { |
c457707e | 437 | pid_t pid; |
7368a6c8 | 438 | |
439 | #ifdef USE_PIPES | |
440 | int pin[2], pout[2], perr[2]; | |
441 | /* Allocate pipes for communicating with the program. */ | |
442 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
443 | packet_disconnect("Could not create pipes: %.100s", | |
444 | strerror(errno)); | |
445 | #else /* USE_PIPES */ | |
446 | int inout[2], err[2]; | |
447 | /* Uses socket pairs to communicate with the program. */ | |
448 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
449 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
450 | packet_disconnect("Could not create socket pairs: %.100s", | |
451 | strerror(errno)); | |
452 | #endif /* USE_PIPES */ | |
453 | if (s == NULL) | |
454 | fatal("do_exec_no_pty: no session"); | |
455 | ||
1d1ffb87 | 456 | session_proctitle(s); |
7368a6c8 | 457 | |
b19d61d7 | 458 | #if defined(USE_PAM) |
78220944 | 459 | do_pam_session(s->pw->pw_name, NULL); |
9afbfcfa | 460 | do_pam_setcred(1); |
7eb73cc1 | 461 | if (is_pam_password_change_required()) |
462 | packet_disconnect("Password change required but no " | |
463 | "TTY available"); | |
266140a8 | 464 | #endif /* USE_PAM */ |
465 | ||
7368a6c8 | 466 | /* Fork the child. */ |
467 | if ((pid = fork()) == 0) { | |
516f0d7d | 468 | fatal_remove_all_cleanups(); |
469 | ||
7368a6c8 | 470 | /* Child. Reinitialize the log since the pid has changed. */ |
471 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
472 | ||
473 | /* | |
474 | * Create a new session and process group since the 4.4BSD | |
475 | * setlogin() affects the entire process group. | |
476 | */ | |
477 | if (setsid() < 0) | |
478 | error("setsid failed: %.100s", strerror(errno)); | |
479 | ||
480 | #ifdef USE_PIPES | |
481 | /* | |
482 | * Redirect stdin. We close the parent side of the socket | |
483 | * pair, and make the child side the standard input. | |
484 | */ | |
485 | close(pin[1]); | |
486 | if (dup2(pin[0], 0) < 0) | |
487 | perror("dup2 stdin"); | |
488 | close(pin[0]); | |
489 | ||
490 | /* Redirect stdout. */ | |
491 | close(pout[0]); | |
492 | if (dup2(pout[1], 1) < 0) | |
493 | perror("dup2 stdout"); | |
494 | close(pout[1]); | |
495 | ||
496 | /* Redirect stderr. */ | |
497 | close(perr[0]); | |
498 | if (dup2(perr[1], 2) < 0) | |
499 | perror("dup2 stderr"); | |
500 | close(perr[1]); | |
501 | #else /* USE_PIPES */ | |
502 | /* | |
503 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
504 | * use the same socket, as some programs (particularly rdist) | |
505 | * seem to depend on it. | |
506 | */ | |
507 | close(inout[1]); | |
508 | close(err[1]); | |
509 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
510 | perror("dup2 stdin"); | |
511 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
512 | perror("dup2 stdout"); | |
513 | if (dup2(err[0], 2) < 0) /* stderr */ | |
514 | perror("dup2 stderr"); | |
515 | #endif /* USE_PIPES */ | |
516 | ||
ef51930f | 517 | #ifdef _UNICOS |
518 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
519 | #endif | |
520 | ||
7368a6c8 | 521 | /* Do processing for the child (exec command etc). */ |
56b3e9ce | 522 | do_child(s, command); |
7368a6c8 | 523 | /* NOTREACHED */ |
524 | } | |
ef51930f | 525 | #ifdef _UNICOS |
526 | signal(WJSIGNAL, cray_job_termination_handler); | |
527 | #endif /* _UNICOS */ | |
3c62e7eb | 528 | #ifdef HAVE_CYGWIN |
529 | if (is_winnt) | |
530 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
531 | #endif | |
7368a6c8 | 532 | if (pid < 0) |
533 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
534 | s->pid = pid; | |
b5c334cc | 535 | /* Set interactive/non-interactive mode. */ |
536 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 537 | #ifdef USE_PIPES |
538 | /* We are the parent. Close the child sides of the pipes. */ | |
539 | close(pin[0]); | |
540 | close(pout[1]); | |
541 | close(perr[1]); | |
542 | ||
e78a59f5 | 543 | if (compat20) { |
e5d7a405 | 544 | session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); |
e78a59f5 | 545 | } else { |
546 | /* Enter the interactive session. */ | |
547 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 548 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 549 | } |
7368a6c8 | 550 | #else /* USE_PIPES */ |
551 | /* We are the parent. Close the child sides of the socket pairs. */ | |
552 | close(inout[0]); | |
553 | close(err[0]); | |
554 | ||
555 | /* | |
556 | * Enter the interactive session. Note: server_loop must be able to | |
557 | * handle the case that fdin and fdout are the same. | |
558 | */ | |
e78a59f5 | 559 | if (compat20) { |
e5d7a405 | 560 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 561 | } else { |
562 | server_loop(pid, inout[1], inout[1], err[1]); | |
563 | /* server_loop has closed inout[1] and err[1]. */ | |
564 | } | |
7368a6c8 | 565 | #endif /* USE_PIPES */ |
566 | } | |
567 | ||
568 | /* | |
569 | * This is called to fork and execute a command when we have a tty. This | |
570 | * will call do_child from the child, and server_loop from the parent after | |
571 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
572 | * lastlog, and other such operations. | |
573 | */ | |
6ae2364d | 574 | void |
65068d16 | 575 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 576 | { |
7368a6c8 | 577 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 578 | pid_t pid; |
7368a6c8 | 579 | |
580 | if (s == NULL) | |
581 | fatal("do_exec_pty: no session"); | |
582 | ptyfd = s->ptyfd; | |
583 | ttyfd = s->ttyfd; | |
584 | ||
b19d61d7 | 585 | #if defined(USE_PAM) |
bb5639fe | 586 | do_pam_session(s->pw->pw_name, s->tty); |
9afbfcfa | 587 | do_pam_setcred(1); |
27cf96de | 588 | #endif |
266140a8 | 589 | |
7368a6c8 | 590 | /* Fork the child. */ |
591 | if ((pid = fork()) == 0) { | |
516f0d7d | 592 | fatal_remove_all_cleanups(); |
57156994 | 593 | |
c345cf9d | 594 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 595 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 596 | /* Close the master side of the pseudo tty. */ |
597 | close(ptyfd); | |
598 | ||
599 | /* Make the pseudo tty our controlling tty. */ | |
600 | pty_make_controlling_tty(&ttyfd, s->tty); | |
601 | ||
05fd093c | 602 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
603 | if (dup2(ttyfd, 0) < 0) | |
604 | error("dup2 stdin: %s", strerror(errno)); | |
605 | if (dup2(ttyfd, 1) < 0) | |
606 | error("dup2 stdout: %s", strerror(errno)); | |
607 | if (dup2(ttyfd, 2) < 0) | |
608 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 609 | |
610 | /* Close the extra descriptor for the pseudo tty. */ | |
611 | close(ttyfd); | |
612 | ||
c345cf9d | 613 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 614 | #ifndef HAVE_OSF_SIA |
ef51930f | 615 | if (!(options.use_login && command == NULL)) { |
616 | #ifdef _UNICOS | |
617 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
618 | #endif /* _UNICOS */ | |
a22aff1f | 619 | do_login(s, command); |
ef51930f | 620 | } |
7e2d5fa4 | 621 | # ifdef LOGIN_NEEDS_UTMPX |
622 | else | |
623 | do_pre_login(s); | |
624 | # endif | |
c96a4aaf | 625 | #endif |
7368a6c8 | 626 | |
7368a6c8 | 627 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 628 | do_child(s, command); |
7368a6c8 | 629 | /* NOTREACHED */ |
630 | } | |
ef51930f | 631 | #ifdef _UNICOS |
632 | signal(WJSIGNAL, cray_job_termination_handler); | |
633 | #endif /* _UNICOS */ | |
3c62e7eb | 634 | #ifdef HAVE_CYGWIN |
635 | if (is_winnt) | |
636 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
637 | #endif | |
7368a6c8 | 638 | if (pid < 0) |
639 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
640 | s->pid = pid; | |
641 | ||
642 | /* Parent. Close the slave side of the pseudo tty. */ | |
643 | close(ttyfd); | |
644 | ||
645 | /* | |
646 | * Create another descriptor of the pty master side for use as the | |
647 | * standard input. We could use the original descriptor, but this | |
648 | * simplifies code in server_loop. The descriptor is bidirectional. | |
649 | */ | |
650 | fdout = dup(ptyfd); | |
651 | if (fdout < 0) | |
652 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
653 | ||
654 | /* we keep a reference to the pty master */ | |
655 | ptymaster = dup(ptyfd); | |
656 | if (ptymaster < 0) | |
657 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
658 | s->ptymaster = ptymaster; | |
659 | ||
660 | /* Enter interactive session. */ | |
b5c334cc | 661 | packet_set_interactive(1); |
e78a59f5 | 662 | if (compat20) { |
663 | session_set_fds(s, ptyfd, fdout, -1); | |
664 | } else { | |
665 | server_loop(pid, ptyfd, fdout, -1); | |
666 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 667 | } |
7368a6c8 | 668 | } |
669 | ||
7e2d5fa4 | 670 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 671 | static void |
7e2d5fa4 | 672 | do_pre_login(Session *s) |
673 | { | |
674 | socklen_t fromlen; | |
675 | struct sockaddr_storage from; | |
676 | pid_t pid = getpid(); | |
677 | ||
678 | /* | |
679 | * Get IP address of client. If the connection is not a socket, let | |
680 | * the address be 0.0.0.0. | |
681 | */ | |
682 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 683 | fromlen = sizeof(from); |
7e2d5fa4 | 684 | if (packet_connection_is_on_socket()) { |
7e2d5fa4 | 685 | if (getpeername(packet_get_connection_in(), |
184eed6a | 686 | (struct sockaddr *) & from, &fromlen) < 0) { |
7e2d5fa4 | 687 | debug("getpeername: %.100s", strerror(errno)); |
688 | fatal_cleanup(); | |
689 | } | |
690 | } | |
691 | ||
692 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
983784a1 | 693 | get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping), |
d4ac26ed | 694 | (struct sockaddr *)&from, fromlen); |
7e2d5fa4 | 695 | } |
696 | #endif | |
697 | ||
dac6753b | 698 | /* |
699 | * This is called to fork and execute a command. If another command is | |
700 | * to be forced, execute that instead. | |
701 | */ | |
702 | void | |
703 | do_exec(Session *s, const char *command) | |
704 | { | |
705 | if (forced_command) { | |
706 | original_command = command; | |
707 | command = forced_command; | |
dac6753b | 708 | debug("Forced command '%.900s'", command); |
709 | } | |
710 | ||
711 | if (s->ttyfd != -1) | |
712 | do_exec_pty(s, command); | |
713 | else | |
714 | do_exec_no_pty(s, command); | |
715 | ||
c95add71 | 716 | original_command = NULL; |
dac6753b | 717 | } |
718 | ||
f7342052 | 719 | |
c345cf9d | 720 | /* administrative, login(1)-like work */ |
721 | void | |
a22aff1f | 722 | do_login(Session *s, const char *command) |
c345cf9d | 723 | { |
c345cf9d | 724 | char *time_string; |
c345cf9d | 725 | socklen_t fromlen; |
726 | struct sockaddr_storage from; | |
c345cf9d | 727 | struct passwd * pw = s->pw; |
728 | pid_t pid = getpid(); | |
729 | ||
730 | /* | |
731 | * Get IP address of client. If the connection is not a socket, let | |
732 | * the address be 0.0.0.0. | |
733 | */ | |
734 | memset(&from, 0, sizeof(from)); | |
d4ac26ed | 735 | fromlen = sizeof(from); |
c345cf9d | 736 | if (packet_connection_is_on_socket()) { |
c345cf9d | 737 | if (getpeername(packet_get_connection_in(), |
f7342052 | 738 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 739 | debug("getpeername: %.100s", strerror(errno)); |
740 | fatal_cleanup(); | |
741 | } | |
742 | } | |
743 | ||
744 | /* Record that there was a login on that tty from the remote host. */ | |
49a34e84 | 745 | if (!use_privsep) |
746 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
747 | get_remote_name_or_ip(utmp_len, | |
748 | options.verify_reverse_mapping), | |
ba1566dd | 749 | (struct sockaddr *)&from, fromlen); |
c345cf9d | 750 | |
2919e060 | 751 | #ifdef USE_PAM |
752 | /* | |
753 | * If password change is needed, do it now. | |
754 | * This needs to occur before the ~/.hushlogin check. | |
755 | */ | |
e11aab29 | 756 | if (is_pam_password_change_required()) { |
2919e060 | 757 | print_pam_messages(); |
758 | do_pam_chauthtok(); | |
759 | } | |
760 | #endif | |
761 | ||
f2c2fd71 | 762 | if (check_quietlogin(s, command)) |
c345cf9d | 763 | return; |
764 | ||
765 | #ifdef USE_PAM | |
e11aab29 | 766 | if (!is_pam_password_change_required()) |
2919e060 | 767 | print_pam_messages(); |
c345cf9d | 768 | #endif /* USE_PAM */ |
769 | #ifdef WITH_AIXAUTHENTICATE | |
770 | if (aixloginmsg && *aixloginmsg) | |
771 | printf("%s\n", aixloginmsg); | |
772 | #endif /* WITH_AIXAUTHENTICATE */ | |
773 | ||
ef51930f | 774 | #ifndef NO_SSH_LASTLOG |
ffbf7323 | 775 | if (options.print_lastlog && s->last_login_time != 0) { |
776 | time_string = ctime(&s->last_login_time); | |
c345cf9d | 777 | if (strchr(time_string, '\n')) |
778 | *strchr(time_string, '\n') = 0; | |
ffbf7323 | 779 | if (strcmp(s->hostname, "") == 0) |
c345cf9d | 780 | printf("Last login: %s\r\n", time_string); |
781 | else | |
ffbf7323 | 782 | printf("Last login: %s from %s\r\n", time_string, |
783 | s->hostname); | |
c345cf9d | 784 | } |
ef51930f | 785 | #endif /* NO_SSH_LASTLOG */ |
f2c2fd71 | 786 | |
787 | do_motd(); | |
788 | } | |
789 | ||
790 | /* | |
791 | * Display the message of the day. | |
792 | */ | |
793 | void | |
794 | do_motd(void) | |
795 | { | |
796 | FILE *f; | |
797 | char buf[256]; | |
798 | ||
c345cf9d | 799 | if (options.print_motd) { |
2e73a022 | 800 | #ifdef HAVE_LOGIN_CAP |
801 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
802 | "/etc/motd"), "r"); | |
803 | #else | |
c345cf9d | 804 | f = fopen("/etc/motd", "r"); |
2e73a022 | 805 | #endif |
c345cf9d | 806 | if (f) { |
807 | while (fgets(buf, sizeof(buf), f)) | |
808 | fputs(buf, stdout); | |
809 | fclose(f); | |
810 | } | |
811 | } | |
812 | } | |
813 | ||
9c328529 | 814 | |
815 | /* | |
816 | * Check for quiet login, either .hushlogin or command given. | |
817 | */ | |
818 | int | |
819 | check_quietlogin(Session *s, const char *command) | |
820 | { | |
821 | char buf[256]; | |
822 | struct passwd *pw = s->pw; | |
823 | struct stat st; | |
824 | ||
825 | /* Return 1 if .hushlogin exists or a command given. */ | |
826 | if (command != NULL) | |
827 | return 1; | |
828 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
829 | #ifdef HAVE_LOGIN_CAP | |
830 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
831 | return 1; | |
832 | #else | |
833 | if (stat(buf, &st) >= 0) | |
834 | return 1; | |
835 | #endif | |
836 | return 0; | |
837 | } | |
838 | ||
7368a6c8 | 839 | /* |
840 | * Sets the value of the given variable in the environment. If the variable | |
841 | * already exists, its value is overriden. | |
842 | */ | |
396c147e | 843 | static void |
1e3b8b07 | 844 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
184eed6a | 845 | const char *value) |
7368a6c8 | 846 | { |
1e3b8b07 | 847 | u_int i, namelen; |
7368a6c8 | 848 | char **env; |
849 | ||
850 | /* | |
851 | * Find the slot where the value should be stored. If the variable | |
852 | * already exists, we reuse the slot; otherwise we append a new slot | |
853 | * at the end of the array, expanding if necessary. | |
854 | */ | |
855 | env = *envp; | |
856 | namelen = strlen(name); | |
857 | for (i = 0; env[i]; i++) | |
858 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
859 | break; | |
860 | if (env[i]) { | |
861 | /* Reuse the slot. */ | |
862 | xfree(env[i]); | |
863 | } else { | |
864 | /* New variable. Expand if necessary. */ | |
865 | if (i >= (*envsizep) - 1) { | |
87f18810 | 866 | if (*envsizep >= 1000) |
867 | fatal("child_set_env: too many env vars," | |
868 | " skipping: %.100s", name); | |
7368a6c8 | 869 | (*envsizep) += 50; |
870 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
871 | } | |
872 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
873 | env[i + 1] = NULL; | |
874 | } | |
875 | ||
876 | /* Allocate space and format the variable in the appropriate slot. */ | |
877 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
878 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
879 | } | |
880 | ||
881 | /* | |
882 | * Reads environment variables from the given file and adds/overrides them | |
883 | * into the environment. If the file does not exist, this does nothing. | |
884 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
885 | * and assignments of the form name=value. No other forms are allowed. | |
886 | */ | |
396c147e | 887 | static void |
1e3b8b07 | 888 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 889 | const char *filename) |
7368a6c8 | 890 | { |
891 | FILE *f; | |
892 | char buf[4096]; | |
893 | char *cp, *value; | |
66087567 | 894 | u_int lineno = 0; |
7368a6c8 | 895 | |
896 | f = fopen(filename, "r"); | |
897 | if (!f) | |
898 | return; | |
899 | ||
900 | while (fgets(buf, sizeof(buf), f)) { | |
66087567 | 901 | if (++lineno > 1000) |
902 | fatal("Too many lines in environment file %s", filename); | |
7368a6c8 | 903 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
904 | ; | |
905 | if (!*cp || *cp == '#' || *cp == '\n') | |
906 | continue; | |
907 | if (strchr(cp, '\n')) | |
908 | *strchr(cp, '\n') = '\0'; | |
909 | value = strchr(cp, '='); | |
910 | if (value == NULL) { | |
66087567 | 911 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
912 | filename); | |
7368a6c8 | 913 | continue; |
914 | } | |
71276795 | 915 | /* |
916 | * Replace the equals sign by nul, and advance value to | |
917 | * the value string. | |
918 | */ | |
7368a6c8 | 919 | *value = '\0'; |
920 | value++; | |
921 | child_set_env(env, envsize, cp, value); | |
922 | } | |
923 | fclose(f); | |
924 | } | |
925 | ||
760b35a6 | 926 | void copy_environment(char **source, char ***env, u_int *envsize) |
7368a6c8 | 927 | { |
760b35a6 | 928 | char *var_name, *var_val; |
7368a6c8 | 929 | int i; |
930 | ||
760b35a6 | 931 | if (source == NULL) |
7368a6c8 | 932 | return; |
2b87da3b | 933 | |
760b35a6 | 934 | for(i = 0; source[i] != NULL; i++) { |
935 | var_name = xstrdup(source[i]); | |
936 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
937 | xfree(var_name); | |
7368a6c8 | 938 | continue; |
7368a6c8 | 939 | } |
760b35a6 | 940 | *var_val++ = '\0'; |
7368a6c8 | 941 | |
760b35a6 | 942 | debug3("Copy environment: %s=%s", var_name, var_val); |
943 | child_set_env(env, envsize, var_name, var_val); | |
944 | ||
945 | xfree(var_name); | |
22d89d24 | 946 | } |
947 | } | |
22d89d24 | 948 | |
f7342052 | 949 | static char ** |
950 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 951 | { |
7368a6c8 | 952 | char buf[256]; |
f7342052 | 953 | u_int i, envsize; |
3e2f2431 | 954 | char **env, *laddr; |
f7342052 | 955 | struct passwd *pw = s->pw; |
7368a6c8 | 956 | |
7368a6c8 | 957 | /* Initialize the environment. */ |
958 | envsize = 100; | |
959 | env = xmalloc(envsize * sizeof(char *)); | |
960 | env[0] = NULL; | |
961 | ||
3c62e7eb | 962 | #ifdef HAVE_CYGWIN |
963 | /* | |
964 | * The Windows environment contains some setting which are | |
965 | * important for a running system. They must not be dropped. | |
966 | */ | |
760b35a6 | 967 | copy_environment(environ, &env, &envsize); |
3c62e7eb | 968 | #endif |
969 | ||
7368a6c8 | 970 | if (!options.use_login) { |
971 | /* Set basic environment. */ | |
972 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
973 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
17ed08c5 | 974 | #ifdef _AIX |
975 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
976 | #endif | |
7368a6c8 | 977 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
2e73a022 | 978 | #ifdef HAVE_LOGIN_CAP |
97686bf9 | 979 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
980 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
981 | else | |
982 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 983 | #else /* HAVE_LOGIN_CAP */ |
984 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 985 | /* |
986 | * There's no standard path on Windows. The path contains | |
987 | * important components pointing to the system directories, | |
988 | * needed for loading shared libraries. So the path better | |
989 | * remains intact here. | |
990 | */ | |
06617857 | 991 | # ifdef SUPERUSER_PATH |
992 | child_set_env(&env, &envsize, "PATH", | |
993 | s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH); | |
994 | # else | |
7368a6c8 | 995 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
06617857 | 996 | # endif /* SUPERUSER_PATH */ |
22d89d24 | 997 | # endif /* HAVE_CYGWIN */ |
998 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 999 | |
1000 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1001 | _PATH_MAILDIR, pw->pw_name); | |
1002 | child_set_env(&env, &envsize, "MAIL", buf); | |
1003 | ||
1004 | /* Normal systems set SHELL by default. */ | |
1005 | child_set_env(&env, &envsize, "SHELL", shell); | |
1006 | } | |
1007 | if (getenv("TZ")) | |
1008 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1009 | ||
1010 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 1011 | if (!options.use_login) { |
1012 | while (custom_environment) { | |
1013 | struct envstring *ce = custom_environment; | |
7fdc56c5 | 1014 | char *str = ce->s; |
f7342052 | 1015 | |
7fdc56c5 | 1016 | for (i = 0; str[i] != '=' && str[i]; i++) |
2548961d | 1017 | ; |
7fdc56c5 | 1018 | if (str[i] == '=') { |
1019 | str[i] = 0; | |
1020 | child_set_env(&env, &envsize, str, str + i + 1); | |
2548961d | 1021 | } |
1022 | custom_environment = ce->next; | |
1023 | xfree(ce->s); | |
1024 | xfree(ce); | |
7368a6c8 | 1025 | } |
7368a6c8 | 1026 | } |
1027 | ||
da0561eb | 1028 | /* SSH_CLIENT deprecated */ |
7368a6c8 | 1029 | snprintf(buf, sizeof buf, "%.50s %d %d", |
f7342052 | 1030 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1031 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1032 | ||
3e2f2431 | 1033 | laddr = get_local_ipaddr(packet_get_connection_in()); |
da0561eb | 1034 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
3e2f2431 | 1035 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1036 | xfree(laddr); | |
da0561eb | 1037 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1038 | ||
56b3e9ce | 1039 | if (s->ttyfd != -1) |
1040 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1041 | if (s->term) | |
1042 | child_set_env(&env, &envsize, "TERM", s->term); | |
1043 | if (s->display) | |
1044 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1045 | if (original_command) |
1046 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1047 | original_command); | |
7368a6c8 | 1048 | |
ef51930f | 1049 | #ifdef _UNICOS |
1050 | if (cray_tmpdir[0] != '\0') | |
1051 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1052 | #endif /* _UNICOS */ | |
1053 | ||
7368a6c8 | 1054 | #ifdef _AIX |
4936fcee | 1055 | { |
1056 | char *cp; | |
1057 | ||
1058 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1059 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1060 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1061 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1062 | read_environment_file(&env, &envsize, "/etc/environment"); | |
1063 | } | |
7368a6c8 | 1064 | #endif |
7368a6c8 | 1065 | #ifdef KRB4 |
ced49be2 | 1066 | if (s->authctxt->krb4_ticket_file) |
1067 | child_set_env(&env, &envsize, "KRBTKFILE", | |
1068 | s->authctxt->krb4_ticket_file); | |
1069 | #endif | |
1070 | #ifdef KRB5 | |
1071 | if (s->authctxt->krb5_ticket_file) | |
1072 | child_set_env(&env, &envsize, "KRB5CCNAME", | |
1073 | s->authctxt->krb5_ticket_file); | |
1074 | #endif | |
7368a6c8 | 1075 | #ifdef USE_PAM |
ee48c949 | 1076 | /* |
1077 | * Pull in any environment variables that may have | |
1078 | * been set by PAM. | |
1079 | */ | |
1080 | { | |
1081 | char **p; | |
1082 | ||
1083 | p = fetch_pam_environment(); | |
1084 | copy_environment(p, &env, &envsize); | |
1085 | free_pam_environment(p); | |
1086 | } | |
7368a6c8 | 1087 | #endif /* USE_PAM */ |
1088 | ||
149cdb60 | 1089 | if (auth_sock_name != NULL) |
7368a6c8 | 1090 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1091 | auth_sock_name); |
7368a6c8 | 1092 | |
1093 | /* read $HOME/.ssh/environment. */ | |
f00bab84 | 1094 | if (options.permit_user_env && !options.use_login) { |
71276795 | 1095 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e2e36358 | 1096 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
7368a6c8 | 1097 | read_environment_file(&env, &envsize, buf); |
1098 | } | |
1099 | if (debug_flag) { | |
1100 | /* dump the environment */ | |
1101 | fprintf(stderr, "Environment:\n"); | |
1102 | for (i = 0; env[i]; i++) | |
1103 | fprintf(stderr, " %.200s\n", env[i]); | |
1104 | } | |
f7342052 | 1105 | return env; |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1110 | * first in this order). | |
1111 | */ | |
1112 | static void | |
1113 | do_rc_files(Session *s, const char *shell) | |
1114 | { | |
1115 | FILE *f = NULL; | |
1116 | char cmd[1024]; | |
1117 | int do_xauth; | |
1118 | struct stat st; | |
1119 | ||
1120 | do_xauth = | |
1121 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1122 | ||
1123 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1124 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1125 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1126 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1127 | if (debug_flag) | |
1128 | fprintf(stderr, "Running %s\n", cmd); | |
1129 | f = popen(cmd, "w"); | |
1130 | if (f) { | |
1131 | if (do_xauth) | |
1132 | fprintf(f, "%s %s\n", s->auth_proto, | |
1133 | s->auth_data); | |
1134 | pclose(f); | |
1135 | } else | |
1136 | fprintf(stderr, "Could not run %s\n", | |
1137 | _PATH_SSH_USER_RC); | |
1138 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1139 | if (debug_flag) | |
1140 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1141 | _PATH_SSH_SYSTEM_RC); | |
1142 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1143 | if (f) { | |
1144 | if (do_xauth) | |
1145 | fprintf(f, "%s %s\n", s->auth_proto, | |
1146 | s->auth_data); | |
1147 | pclose(f); | |
1148 | } else | |
1149 | fprintf(stderr, "Could not run %s\n", | |
1150 | _PATH_SSH_SYSTEM_RC); | |
1151 | } else if (do_xauth && options.xauth_location != NULL) { | |
1152 | /* Add authority data to .Xauthority if appropriate. */ | |
1153 | if (debug_flag) { | |
1154 | fprintf(stderr, | |
fe661d8f | 1155 | "Running %.500s remove %.100s\n", |
1156 | options.xauth_location, s->auth_display); | |
1157 | fprintf(stderr, | |
1158 | "%.500s add %.100s %.100s %.100s\n", | |
f7342052 | 1159 | options.xauth_location, s->auth_display, |
1160 | s->auth_proto, s->auth_data); | |
1161 | } | |
1162 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1163 | options.xauth_location); | |
1164 | f = popen(cmd, "w"); | |
1165 | if (f) { | |
fe661d8f | 1166 | fprintf(f, "remove %s\n", |
1167 | s->auth_display); | |
f7342052 | 1168 | fprintf(f, "add %s %s %s\n", |
1169 | s->auth_display, s->auth_proto, | |
1170 | s->auth_data); | |
1171 | pclose(f); | |
1172 | } else { | |
1173 | fprintf(stderr, "Could not run %s\n", | |
1174 | cmd); | |
1175 | } | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | static void | |
1180 | do_nologin(struct passwd *pw) | |
1181 | { | |
1182 | FILE *f = NULL; | |
1183 | char buf[1024]; | |
1184 | ||
1185 | #ifdef HAVE_LOGIN_CAP | |
1186 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1187 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1188 | _PATH_NOLOGIN), "r"); | |
1189 | #else | |
1190 | if (pw->pw_uid) | |
1191 | f = fopen(_PATH_NOLOGIN, "r"); | |
1192 | #endif | |
1193 | if (f) { | |
1194 | /* /etc/nologin exists. Print its contents and exit. */ | |
8bd4e2ae | 1195 | log("User %.100s not allowed because %s exists", |
1196 | pw->pw_name, _PATH_NOLOGIN); | |
f7342052 | 1197 | while (fgets(buf, sizeof(buf), f)) |
1198 | fputs(buf, stderr); | |
1199 | fclose(f); | |
99f4fb69 | 1200 | fflush(NULL); |
f7342052 | 1201 | exit(254); |
1202 | } | |
1203 | } | |
1204 | ||
1205 | /* Set login name, uid, gid, and groups. */ | |
1853d1ef | 1206 | void |
f7342052 | 1207 | do_setusercontext(struct passwd *pw) |
1208 | { | |
2731632a | 1209 | #ifndef HAVE_CYGWIN |
1210 | if (getuid() == 0 || geteuid() == 0) | |
f7342052 | 1211 | #endif /* HAVE_CYGWIN */ |
2731632a | 1212 | { |
1213 | ||
8bbfc882 | 1214 | #ifdef HAVE_SETPCRED |
1215 | setpcred(pw->pw_name); | |
1216 | #endif /* HAVE_SETPCRED */ | |
f7342052 | 1217 | #ifdef HAVE_LOGIN_CAP |
2d199535 | 1218 | # ifdef __bsdi__ |
8695f9f7 | 1219 | setpgid(0, 0); |
2d199535 | 1220 | # endif |
f7342052 | 1221 | if (setusercontext(lc, pw, pw->pw_uid, |
1222 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1223 | perror("unable to set user context"); | |
1224 | exit(1); | |
1225 | } | |
1226 | #else | |
1227 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1228 | /* Sets login uid for accounting */ | |
1229 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1230 | error("setluid: %s", strerror(errno)); | |
1231 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1232 | ||
1233 | if (setlogin(pw->pw_name) < 0) | |
1234 | error("setlogin failed: %s", strerror(errno)); | |
1235 | if (setgid(pw->pw_gid) < 0) { | |
1236 | perror("setgid"); | |
1237 | exit(1); | |
1238 | } | |
1239 | /* Initialize the group list. */ | |
1240 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1241 | perror("initgroups"); | |
1242 | exit(1); | |
1243 | } | |
1244 | endgrent(); | |
1245 | # ifdef USE_PAM | |
1246 | /* | |
1247 | * PAM credentials may take the form of supplementary groups. | |
1248 | * These will have been wiped by the above initgroups() call. | |
1249 | * Reestablish them here. | |
1250 | */ | |
1251 | do_pam_setcred(0); | |
1252 | # endif /* USE_PAM */ | |
1253 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1254 | irix_setusercontext(pw); | |
1255 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
e2bc41f9 | 1256 | # ifdef _AIX |
0ba40daa | 1257 | aix_usrinfo(pw); |
e2bc41f9 | 1258 | # endif /* _AIX */ |
f7342052 | 1259 | /* Permanently switch to the desired uid. */ |
1260 | permanently_set_uid(pw); | |
1261 | #endif | |
1262 | } | |
2731632a | 1263 | |
1264 | #ifdef HAVE_CYGWIN | |
1265 | if (is_winnt) | |
1266 | #endif | |
f7342052 | 1267 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1268 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1269 | } | |
1270 | ||
51aeb639 | 1271 | static void |
1853d1ef | 1272 | launch_login(struct passwd *pw, const char *hostname) |
1273 | { | |
1274 | /* Launch login(1). */ | |
1275 | ||
85cc9118 | 1276 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1277 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1278 | (s->term ? s->term : "unknown"), |
1853d1ef | 1279 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1280 | #ifdef LOGIN_NO_ENDOPT |
1281 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1282 | #else | |
1853d1ef | 1283 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1284 | #endif |
1853d1ef | 1285 | |
1286 | /* Login couldn't be executed, die. */ | |
1287 | ||
1288 | perror("login"); | |
1289 | exit(1); | |
1290 | } | |
1291 | ||
f7342052 | 1292 | /* |
1293 | * Performs common processing for the child, such as setting up the | |
1294 | * environment, closing extra file descriptors, setting the user and group | |
1295 | * ids, and executing the command or shell. | |
1296 | */ | |
1297 | void | |
1298 | do_child(Session *s, const char *command) | |
1299 | { | |
1300 | extern char **environ; | |
1301 | char **env; | |
1302 | char *argv[10]; | |
1303 | const char *shell, *shell0, *hostname = NULL; | |
1304 | struct passwd *pw = s->pw; | |
1305 | u_int i; | |
1306 | ||
1307 | /* remove hostkey from the child's memory */ | |
1308 | destroy_sensitive_data(); | |
1309 | ||
1310 | /* login(1) is only called if we execute the login shell */ | |
1311 | if (options.use_login && command != NULL) | |
1312 | options.use_login = 0; | |
1313 | ||
ef51930f | 1314 | #ifdef _UNICOS |
1315 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1316 | #endif /* _UNICOS */ | |
1317 | ||
f7342052 | 1318 | /* |
1319 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1320 | * switch, so we let login(1) to this for us. | |
1321 | */ | |
1322 | if (!options.use_login) { | |
1323 | #ifdef HAVE_OSF_SIA | |
1324 | session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty); | |
1325 | if (!check_quietlogin(s, command)) | |
1326 | do_motd(); | |
1327 | #else /* HAVE_OSF_SIA */ | |
1328 | do_nologin(pw); | |
1329 | do_setusercontext(pw); | |
1330 | #endif /* HAVE_OSF_SIA */ | |
1331 | } | |
1332 | ||
1333 | /* | |
1334 | * Get the shell from the password data. An empty shell field is | |
1335 | * legal, and means /bin/sh. | |
1336 | */ | |
1337 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
32214c88 | 1338 | |
1339 | /* | |
1340 | * Make sure $SHELL points to the shell from the password file, | |
1341 | * even if shell is overridden from login.conf | |
1342 | */ | |
1343 | env = do_setup_env(s, shell); | |
1344 | ||
f7342052 | 1345 | #ifdef HAVE_LOGIN_CAP |
1346 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1347 | #endif | |
1348 | ||
2e73a022 | 1349 | /* we have to stash the hostname before we close our socket. */ |
1350 | if (options.use_login) | |
46e3af7f | 1351 | hostname = get_remote_name_or_ip(utmp_len, |
bf4c5edc | 1352 | options.verify_reverse_mapping); |
7368a6c8 | 1353 | /* |
1354 | * Close the connection descriptors; note that this is the child, and | |
1355 | * the server will still have the socket open, and it is important | |
1356 | * that we do not shutdown it. Note that the descriptors cannot be | |
1357 | * closed before building the environment, as we call | |
1358 | * get_remote_ipaddr there. | |
1359 | */ | |
1360 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1361 | close(packet_get_connection_in()); | |
1362 | else { | |
1363 | close(packet_get_connection_in()); | |
1364 | close(packet_get_connection_out()); | |
1365 | } | |
1366 | /* | |
1367 | * Close all descriptors related to channels. They will still remain | |
1368 | * open in the parent. | |
1369 | */ | |
1370 | /* XXX better use close-on-exec? -markus */ | |
1371 | channel_close_all(); | |
1372 | ||
1373 | /* | |
1374 | * Close any extra file descriptors. Note that there may still be | |
1375 | * descriptors left by system functions. They will be closed later. | |
1376 | */ | |
1377 | endpwent(); | |
1378 | ||
1379 | /* | |
1380 | * Close any extra open file descriptors so that we don\'t have them | |
1381 | * hanging around in clients. Note that we want to do this after | |
1382 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1383 | * descriptors open. | |
1384 | */ | |
1385 | for (i = 3; i < 64; i++) | |
1386 | close(i); | |
1387 | ||
7368a6c8 | 1388 | /* |
2a8a6488 | 1389 | * Must take new environment into use so that .ssh/rc, |
1390 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1391 | */ |
1392 | environ = env; | |
1393 | ||
6fcf67f7 | 1394 | #ifdef AFS |
1395 | /* Try to get AFS tokens for the local cell. */ | |
1396 | if (k_hasafs()) { | |
1397 | char cell[64]; | |
184eed6a | 1398 | |
6fcf67f7 | 1399 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) |
1400 | krb_afslog(cell, 0); | |
184eed6a | 1401 | |
6fcf67f7 | 1402 | krb_afslog(0, 0); |
1403 | } | |
1404 | #endif /* AFS */ | |
1405 | ||
dab89049 | 1406 | /* Change current directory to the user\'s home directory. */ |
1407 | if (chdir(pw->pw_dir) < 0) { | |
1408 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1409 | pw->pw_dir, strerror(errno)); | |
1410 | #ifdef HAVE_LOGIN_CAP | |
1411 | if (login_getcapbool(lc, "requirehome", 0)) | |
1412 | exit(1); | |
1413 | #endif | |
1414 | } | |
1415 | ||
f7342052 | 1416 | if (!options.use_login) |
1417 | do_rc_files(s, shell); | |
1d3c30db | 1418 | |
1419 | /* restore SIGPIPE for child */ | |
1420 | signal(SIGPIPE, SIG_DFL); | |
1421 | ||
f7342052 | 1422 | if (options.use_login) { |
1853d1ef | 1423 | launch_login(pw, hostname); |
1424 | /* NEVERREACHED */ | |
f7342052 | 1425 | } |
1426 | ||
1427 | /* Get the last component of the shell name. */ | |
1428 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1429 | shell0++; | |
1430 | else | |
1431 | shell0 = shell; | |
1432 | ||
7368a6c8 | 1433 | /* |
1434 | * If we have no command, execute the shell. In this case, the shell | |
1435 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1436 | * this is a login shell. | |
1437 | */ | |
1438 | if (!command) { | |
f7342052 | 1439 | char argv0[256]; |
7368a6c8 | 1440 | |
f7342052 | 1441 | /* Start the shell. Set initial character to '-'. */ |
1442 | argv0[0] = '-'; | |
7368a6c8 | 1443 | |
f7342052 | 1444 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1445 | >= sizeof(argv0) - 1) { | |
1446 | errno = EINVAL; | |
7368a6c8 | 1447 | perror(shell); |
1448 | exit(1); | |
f7342052 | 1449 | } |
7368a6c8 | 1450 | |
f7342052 | 1451 | /* Execute the shell. */ |
1452 | argv[0] = argv0; | |
1453 | argv[1] = NULL; | |
1454 | execve(shell, argv, env); | |
7368a6c8 | 1455 | |
f7342052 | 1456 | /* Executing the shell failed. */ |
1457 | perror(shell); | |
1458 | exit(1); | |
7368a6c8 | 1459 | } |
1460 | /* | |
1461 | * Execute the command using the user's shell. This uses the -c | |
1462 | * option to execute the command. | |
1463 | */ | |
f7342052 | 1464 | argv[0] = (char *) shell0; |
7368a6c8 | 1465 | argv[1] = "-c"; |
1466 | argv[2] = (char *) command; | |
1467 | argv[3] = NULL; | |
1468 | execve(shell, argv, env); | |
1469 | perror(shell); | |
1470 | exit(1); | |
1471 | } | |
1472 | ||
1473 | Session * | |
1474 | session_new(void) | |
1475 | { | |
1476 | int i; | |
1477 | static int did_init = 0; | |
1478 | if (!did_init) { | |
1479 | debug("session_new: init"); | |
184eed6a | 1480 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1481 | sessions[i].used = 0; |
7368a6c8 | 1482 | } |
1483 | did_init = 1; | |
1484 | } | |
184eed6a | 1485 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1486 | Session *s = &sessions[i]; |
1487 | if (! s->used) { | |
690d0d7f | 1488 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1489 | s->chanid = -1; |
1490 | s->ptyfd = -1; | |
1491 | s->ttyfd = -1; | |
7368a6c8 | 1492 | s->used = 1; |
86066315 | 1493 | s->self = i; |
02323c45 | 1494 | debug("session_new: session %d", i); |
7368a6c8 | 1495 | return s; |
1496 | } | |
1497 | } | |
1498 | return NULL; | |
1499 | } | |
1500 | ||
396c147e | 1501 | static void |
7368a6c8 | 1502 | session_dump(void) |
1503 | { | |
1504 | int i; | |
184eed6a | 1505 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1506 | Session *s = &sessions[i]; |
c457707e | 1507 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1508 | s->used, |
1509 | s->self, | |
1510 | s, | |
1511 | s->chanid, | |
c457707e | 1512 | (long)s->pid); |
7368a6c8 | 1513 | } |
1514 | } | |
1515 | ||
e78a59f5 | 1516 | int |
57156994 | 1517 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1518 | { |
1519 | Session *s = session_new(); | |
1520 | debug("session_open: channel %d", chanid); | |
1521 | if (s == NULL) { | |
1522 | error("no more sessions"); | |
1523 | return 0; | |
1524 | } | |
57156994 | 1525 | s->authctxt = authctxt; |
1526 | s->pw = authctxt->pw; | |
e78a59f5 | 1527 | if (s->pw == NULL) |
0725ea77 | 1528 | fatal("no user for session %d", s->self); |
0b242b12 | 1529 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1530 | s->chanid = chanid; | |
e78a59f5 | 1531 | return 1; |
1532 | } | |
1533 | ||
1853d1ef | 1534 | Session * |
1535 | session_by_tty(char *tty) | |
1536 | { | |
1537 | int i; | |
1538 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1539 | Session *s = &sessions[i]; | |
1540 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1541 | debug("session_by_tty: session %d tty %s", i, tty); | |
1542 | return s; | |
1543 | } | |
1544 | } | |
1545 | debug("session_by_tty: unknown tty %.100s", tty); | |
1546 | session_dump(); | |
1547 | return NULL; | |
1548 | } | |
1549 | ||
396c147e | 1550 | static Session * |
e78a59f5 | 1551 | session_by_channel(int id) |
1552 | { | |
1553 | int i; | |
184eed6a | 1554 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1555 | Session *s = &sessions[i]; |
1556 | if (s->used && s->chanid == id) { | |
1557 | debug("session_by_channel: session %d channel %d", i, id); | |
1558 | return s; | |
1559 | } | |
1560 | } | |
1561 | debug("session_by_channel: unknown channel %d", id); | |
1562 | session_dump(); | |
1563 | return NULL; | |
1564 | } | |
1565 | ||
396c147e | 1566 | static Session * |
e78a59f5 | 1567 | session_by_pid(pid_t pid) |
1568 | { | |
1569 | int i; | |
c457707e | 1570 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1571 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1572 | Session *s = &sessions[i]; |
1573 | if (s->used && s->pid == pid) | |
1574 | return s; | |
1575 | } | |
c457707e | 1576 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1577 | session_dump(); |
1578 | return NULL; | |
1579 | } | |
1580 | ||
396c147e | 1581 | static int |
e78a59f5 | 1582 | session_window_change_req(Session *s) |
1583 | { | |
1584 | s->col = packet_get_int(); | |
1585 | s->row = packet_get_int(); | |
1586 | s->xpixel = packet_get_int(); | |
1587 | s->ypixel = packet_get_int(); | |
95500969 | 1588 | packet_check_eom(); |
e78a59f5 | 1589 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1590 | return 1; | |
1591 | } | |
1592 | ||
396c147e | 1593 | static int |
e78a59f5 | 1594 | session_pty_req(Session *s) |
1595 | { | |
1e3b8b07 | 1596 | u_int len; |
30dcc918 | 1597 | int n_bytes; |
762715ce | 1598 | |
653d5f86 | 1599 | if (no_pty_flag) { |
1600 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1601 | return 0; |
653d5f86 | 1602 | } |
1603 | if (s->ttyfd != -1) { | |
1604 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1605 | return 0; |
653d5f86 | 1606 | } |
ffbf7323 | 1607 | /* Get the time and hostname when the user last logged in. */ |
1608 | if (options.print_lastlog) { | |
1609 | s->hostname[0] = '\0'; | |
1610 | s->last_login_time = get_last_login_time(s->pw->pw_uid, | |
1611 | s->pw->pw_name, s->hostname, sizeof(s->hostname)); | |
1612 | } | |
653d5f86 | 1613 | |
e78a59f5 | 1614 | s->term = packet_get_string(&len); |
653d5f86 | 1615 | |
1616 | if (compat20) { | |
1617 | s->col = packet_get_int(); | |
1618 | s->row = packet_get_int(); | |
1619 | } else { | |
1620 | s->row = packet_get_int(); | |
1621 | s->col = packet_get_int(); | |
1622 | } | |
e78a59f5 | 1623 | s->xpixel = packet_get_int(); |
1624 | s->ypixel = packet_get_int(); | |
1625 | ||
1626 | if (strcmp(s->term, "") == 0) { | |
1627 | xfree(s->term); | |
1628 | s->term = NULL; | |
1629 | } | |
653d5f86 | 1630 | |
e78a59f5 | 1631 | /* Allocate a pty and open it. */ |
653d5f86 | 1632 | debug("Allocating pty."); |
1853d1ef | 1633 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1634 | if (s->term) |
1635 | xfree(s->term); | |
e78a59f5 | 1636 | s->term = NULL; |
1637 | s->ptyfd = -1; | |
1638 | s->ttyfd = -1; | |
1639 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1640 | return 0; |
e78a59f5 | 1641 | } |
1642 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1643 | |
1644 | /* for SSH1 the tty modes length is not given */ | |
1645 | if (!compat20) | |
1646 | n_bytes = packet_remaining(); | |
1647 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1648 | ||
e78a59f5 | 1649 | /* |
1650 | * Add a cleanup function to clear the utmp entry and record logout | |
1651 | * time in case we call fatal() (e.g., the connection gets closed). | |
1652 | */ | |
86066315 | 1653 | fatal_add_cleanup(session_pty_cleanup, (void *)s); |
1853d1ef | 1654 | if (!use_privsep) |
1655 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1656 | |
1657 | /* Set window size from the packet. */ | |
e78a59f5 | 1658 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1659 | ||
95500969 | 1660 | packet_check_eom(); |
1d1ffb87 | 1661 | session_proctitle(s); |
e78a59f5 | 1662 | return 1; |
1663 | } | |
1664 | ||
396c147e | 1665 | static int |
0b242b12 | 1666 | session_subsystem_req(Session *s) |
1667 | { | |
01855277 | 1668 | struct stat st; |
1e3b8b07 | 1669 | u_int len; |
0b242b12 | 1670 | int success = 0; |
01855277 | 1671 | char *cmd, *subsys = packet_get_string(&len); |
38c295d6 | 1672 | int i; |
0b242b12 | 1673 | |
95500969 | 1674 | packet_check_eom(); |
8875ca97 | 1675 | log("subsystem request for %.100s", subsys); |
0b242b12 | 1676 | |
38c295d6 | 1677 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1678 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
1679 | cmd = options.subsystem_command[i]; | |
1680 | if (stat(cmd, &st) < 0) { | |
1681 | error("subsystem: cannot stat %s: %s", cmd, | |
1682 | strerror(errno)); | |
1683 | break; | |
1684 | } | |
1685 | debug("subsystem: exec() %s", cmd); | |
e5d7a405 | 1686 | s->is_subsystem = 1; |
01855277 | 1687 | do_exec(s, cmd); |
38c295d6 | 1688 | success = 1; |
24932ee9 | 1689 | break; |
38c295d6 | 1690 | } |
1691 | } | |
1692 | ||
1693 | if (!success) | |
8875ca97 | 1694 | log("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1695 | subsys); |
38c295d6 | 1696 | |
0b242b12 | 1697 | xfree(subsys); |
1698 | return success; | |
1699 | } | |
1700 | ||
396c147e | 1701 | static int |
0b242b12 | 1702 | session_x11_req(Session *s) |
1703 | { | |
8dcd9d5c | 1704 | int success; |
0b242b12 | 1705 | |
1706 | s->single_connection = packet_get_char(); | |
1707 | s->auth_proto = packet_get_string(NULL); | |
1708 | s->auth_data = packet_get_string(NULL); | |
1709 | s->screen = packet_get_int(); | |
95500969 | 1710 | packet_check_eom(); |
0b242b12 | 1711 | |
8dcd9d5c | 1712 | success = session_setup_x11fwd(s); |
1713 | if (!success) { | |
0b242b12 | 1714 | xfree(s->auth_proto); |
1715 | xfree(s->auth_data); | |
1500bcdd | 1716 | s->auth_proto = NULL; |
1717 | s->auth_data = NULL; | |
0b242b12 | 1718 | } |
8dcd9d5c | 1719 | return success; |
0b242b12 | 1720 | } |
1721 | ||
396c147e | 1722 | static int |
38c295d6 | 1723 | session_shell_req(Session *s) |
1724 | { | |
95500969 | 1725 | packet_check_eom(); |
dac6753b | 1726 | do_exec(s, NULL); |
38c295d6 | 1727 | return 1; |
1728 | } | |
1729 | ||
396c147e | 1730 | static int |
38c295d6 | 1731 | session_exec_req(Session *s) |
1732 | { | |
1e3b8b07 | 1733 | u_int len; |
38c295d6 | 1734 | char *command = packet_get_string(&len); |
95500969 | 1735 | packet_check_eom(); |
dac6753b | 1736 | do_exec(s, command); |
c95add71 | 1737 | xfree(command); |
38c295d6 | 1738 | return 1; |
1739 | } | |
1740 | ||
396c147e | 1741 | static int |
fa08c86b | 1742 | session_auth_agent_req(Session *s) |
1743 | { | |
1744 | static int called = 0; | |
95500969 | 1745 | packet_check_eom(); |
d343d900 | 1746 | if (no_agent_forwarding_flag) { |
1747 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1748 | return 0; | |
1749 | } | |
fa08c86b | 1750 | if (called) { |
1751 | return 0; | |
1752 | } else { | |
1753 | called = 1; | |
1754 | return auth_input_request_forwarding(s->pw); | |
1755 | } | |
1756 | } | |
1757 | ||
7899c98f | 1758 | int |
1759 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 1760 | { |
e78a59f5 | 1761 | int success = 0; |
e78a59f5 | 1762 | Session *s; |
e78a59f5 | 1763 | |
7899c98f | 1764 | if ((s = session_by_channel(c->self)) == NULL) { |
1765 | log("session_input_channel_req: no session %d req %.100s", | |
1766 | c->self, rtype); | |
1767 | return 0; | |
1768 | } | |
1769 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 1770 | |
1771 | /* | |
e5d7a405 | 1772 | * a session is in LARVAL state until a shell, a command |
1773 | * or a subsystem is executed | |
e78a59f5 | 1774 | */ |
1775 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1776 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1777 | success = session_shell_req(s); |
e78a59f5 | 1778 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1779 | success = session_exec_req(s); |
e78a59f5 | 1780 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1781 | success = session_pty_req(s); |
0b242b12 | 1782 | } else if (strcmp(rtype, "x11-req") == 0) { |
1783 | success = session_x11_req(s); | |
fa08c86b | 1784 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1785 | success = session_auth_agent_req(s); | |
0b242b12 | 1786 | } else if (strcmp(rtype, "subsystem") == 0) { |
1787 | success = session_subsystem_req(s); | |
e78a59f5 | 1788 | } |
1789 | } | |
1790 | if (strcmp(rtype, "window-change") == 0) { | |
1791 | success = session_window_change_req(s); | |
1792 | } | |
7899c98f | 1793 | return success; |
e78a59f5 | 1794 | } |
1795 | ||
1796 | void | |
1797 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1798 | { | |
1799 | if (!compat20) | |
1800 | fatal("session_set_fds: called for proto != 2.0"); | |
1801 | /* | |
1802 | * now that have a child and a pipe to the child, | |
1803 | * we can activate our channel and register the fd's | |
1804 | */ | |
1805 | if (s->chanid == -1) | |
1806 | fatal("no channel for session %d", s->self); | |
1807 | channel_set_fds(s->chanid, | |
1808 | fdout, fdin, fderr, | |
a22aff1f | 1809 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 1810 | 1, |
1811 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 1812 | } |
1813 | ||
86066315 | 1814 | /* |
1815 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
1816 | * (e.g., due to a dropped connection). | |
1817 | */ | |
1853d1ef | 1818 | void |
1819 | session_pty_cleanup2(void *session) | |
7368a6c8 | 1820 | { |
86066315 | 1821 | Session *s = session; |
1822 | ||
1823 | if (s == NULL) { | |
1824 | error("session_pty_cleanup: no session"); | |
1825 | return; | |
1826 | } | |
1827 | if (s->ttyfd == -1) | |
7368a6c8 | 1828 | return; |
1829 | ||
0725ea77 | 1830 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 1831 | |
7368a6c8 | 1832 | /* Record that the user has logged out. */ |
86066315 | 1833 | if (s->pid != 0) |
f3837bc6 | 1834 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 1835 | |
1836 | /* Release the pseudo-tty. */ | |
1853d1ef | 1837 | if (getuid() == 0) |
1838 | pty_release(s->tty); | |
7368a6c8 | 1839 | |
1840 | /* | |
1841 | * Close the server side of the socket pairs. We must do this after | |
1842 | * the pty cleanup, so that another process doesn't get this pty | |
1843 | * while we're still cleaning up. | |
1844 | */ | |
1845 | if (close(s->ptymaster) < 0) | |
1853d1ef | 1846 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 1847 | |
1848 | /* unlink pty from session */ | |
1849 | s->ttyfd = -1; | |
7368a6c8 | 1850 | } |
e78a59f5 | 1851 | |
1853d1ef | 1852 | void |
1853 | session_pty_cleanup(void *session) | |
1854 | { | |
1855 | PRIVSEP(session_pty_cleanup2(session)); | |
1856 | } | |
1857 | ||
6c723e7c | 1858 | static char * |
1859 | sig2name(int sig) | |
1860 | { | |
1861 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
1862 | SSH_SIG(ABRT); | |
1863 | SSH_SIG(ALRM); | |
1864 | SSH_SIG(FPE); | |
1865 | SSH_SIG(HUP); | |
1866 | SSH_SIG(ILL); | |
1867 | SSH_SIG(INT); | |
1868 | SSH_SIG(KILL); | |
1869 | SSH_SIG(PIPE); | |
1870 | SSH_SIG(QUIT); | |
1871 | SSH_SIG(SEGV); | |
1872 | SSH_SIG(TERM); | |
1873 | SSH_SIG(USR1); | |
1874 | SSH_SIG(USR2); | |
1875 | #undef SSH_SIG | |
1876 | return "SIG@openssh.com"; | |
1877 | } | |
1878 | ||
396c147e | 1879 | static void |
e78a59f5 | 1880 | session_exit_message(Session *s, int status) |
1881 | { | |
1882 | Channel *c; | |
5a4ae906 | 1883 | |
1884 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 1885 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 1886 | s->self, s->chanid); |
c457707e | 1887 | debug("session_exit_message: session %d channel %d pid %ld", |
1888 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 1889 | |
1890 | if (WIFEXITED(status)) { | |
5a4ae906 | 1891 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 1892 | packet_put_int(WEXITSTATUS(status)); |
1893 | packet_send(); | |
1894 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 1895 | channel_request_start(s->chanid, "exit-signal", 0); |
6c723e7c | 1896 | packet_put_cstring(sig2name(WTERMSIG(status))); |
a64009ad | 1897 | #ifdef WCOREDUMP |
e78a59f5 | 1898 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1899 | #else /* WCOREDUMP */ |
1900 | packet_put_char(0); | |
1901 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1902 | packet_put_cstring(""); |
1903 | packet_put_cstring(""); | |
1904 | packet_send(); | |
1905 | } else { | |
1906 | /* Some weird exit cause. Just exit. */ | |
1907 | packet_disconnect("wait returned status %04x.", status); | |
1908 | } | |
1909 | ||
1910 | /* disconnect channel */ | |
1911 | debug("session_exit_message: release channel %d", s->chanid); | |
1912 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1913 | /* |
1914 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1915 | * interested in data we write. | |
1916 | * Note that we must not call 'chan_read_failed', since there could | |
1917 | * be some more data waiting in the pipe. | |
1918 | */ | |
0b242b12 | 1919 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1920 | chan_write_failed(c); | |
e78a59f5 | 1921 | s->chanid = -1; |
1922 | } | |
1923 | ||
1853d1ef | 1924 | void |
86066315 | 1925 | session_close(Session *s) |
e78a59f5 | 1926 | { |
c457707e | 1927 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
86066315 | 1928 | if (s->ttyfd != -1) { |
1929 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
1930 | session_pty_cleanup(s); | |
1931 | } | |
e78a59f5 | 1932 | if (s->term) |
1933 | xfree(s->term); | |
1934 | if (s->display) | |
1935 | xfree(s->display); | |
f9314d9a | 1936 | if (s->auth_display) |
1937 | xfree(s->auth_display); | |
e78a59f5 | 1938 | if (s->auth_data) |
1939 | xfree(s->auth_data); | |
1940 | if (s->auth_proto) | |
1941 | xfree(s->auth_proto); | |
1942 | s->used = 0; | |
1d1ffb87 | 1943 | session_proctitle(s); |
e78a59f5 | 1944 | } |
1945 | ||
1946 | void | |
1947 | session_close_by_pid(pid_t pid, int status) | |
1948 | { | |
1949 | Session *s = session_by_pid(pid); | |
1950 | if (s == NULL) { | |
c457707e | 1951 | debug("session_close_by_pid: no session for pid %ld", |
1952 | (long)pid); | |
e78a59f5 | 1953 | return; |
1954 | } | |
1955 | if (s->chanid != -1) | |
1956 | session_exit_message(s, status); | |
1957 | session_close(s); | |
1958 | } | |
1959 | ||
1960 | /* | |
1961 | * this is called when a channel dies before | |
1962 | * the session 'child' itself dies | |
1963 | */ | |
1964 | void | |
1965 | session_close_by_channel(int id, void *arg) | |
1966 | { | |
1967 | Session *s = session_by_channel(id); | |
1968 | if (s == NULL) { | |
418e724c | 1969 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 1970 | return; |
1971 | } | |
c457707e | 1972 | debug("session_close_by_channel: channel %d child %ld", |
1973 | id, (long)s->pid); | |
d5f24f94 | 1974 | if (s->pid != 0) { |
418e724c | 1975 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 1976 | /* |
1977 | * delay detach of session, but release pty, since | |
1978 | * the fd's to the child are already closed | |
1979 | */ | |
1980 | if (s->ttyfd != -1) { | |
1981 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
1982 | session_pty_cleanup(s); | |
1983 | } | |
418e724c | 1984 | return; |
e78a59f5 | 1985 | } |
418e724c | 1986 | /* detach by removing callback */ |
1987 | channel_cancel_cleanup(s->chanid); | |
1988 | s->chanid = -1; | |
d5f24f94 | 1989 | session_close(s); |
1990 | } | |
1991 | ||
1992 | void | |
1853d1ef | 1993 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 1994 | { |
1995 | int i; | |
184eed6a | 1996 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 1997 | Session *s = &sessions[i]; |
1853d1ef | 1998 | if (s->used) { |
1999 | if (closefunc != NULL) | |
2000 | closefunc(s); | |
2001 | else | |
2002 | session_close(s); | |
2003 | } | |
d5f24f94 | 2004 | } |
e78a59f5 | 2005 | } |
2006 | ||
396c147e | 2007 | static char * |
1d1ffb87 | 2008 | session_tty_list(void) |
2009 | { | |
2010 | static char buf[1024]; | |
2011 | int i; | |
d0104542 | 2012 | char *cp; |
2013 | ||
1d1ffb87 | 2014 | buf[0] = '\0'; |
184eed6a | 2015 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 2016 | Session *s = &sessions[i]; |
2017 | if (s->used && s->ttyfd != -1) { | |
d0104542 | 2018 | |
2019 | if (strncmp(s->tty, "/dev/", 5) != 0) { | |
2020 | cp = strrchr(s->tty, '/'); | |
2021 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2022 | } else | |
2023 | cp = s->tty + 5; | |
2024 | ||
1d1ffb87 | 2025 | if (buf[0] != '\0') |
2026 | strlcat(buf, ",", sizeof buf); | |
d0104542 | 2027 | strlcat(buf, cp, sizeof buf); |
1d1ffb87 | 2028 | } |
2029 | } | |
2030 | if (buf[0] == '\0') | |
2031 | strlcpy(buf, "notty", sizeof buf); | |
2032 | return buf; | |
2033 | } | |
2034 | ||
2035 | void | |
2036 | session_proctitle(Session *s) | |
2037 | { | |
2038 | if (s->pw == NULL) | |
2039 | error("no user for session %d", s->self); | |
2040 | else | |
2041 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2042 | } | |
2043 | ||
8dcd9d5c | 2044 | int |
2045 | session_setup_x11fwd(Session *s) | |
2046 | { | |
8dcd9d5c | 2047 | struct stat st; |
c9d0ad9b | 2048 | char display[512], auth_display[512]; |
2049 | char hostname[MAXHOSTNAMELEN]; | |
8dcd9d5c | 2050 | |
2051 | if (no_x11_forwarding_flag) { | |
2052 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2053 | return 0; | |
2054 | } | |
2055 | if (!options.x11_forwarding) { | |
2056 | debug("X11 forwarding disabled in server configuration file."); | |
2057 | return 0; | |
2058 | } | |
2059 | if (!options.xauth_location || | |
2060 | (stat(options.xauth_location, &st) == -1)) { | |
2061 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2062 | return 0; | |
2063 | } | |
ff027d84 | 2064 | if (options.use_login) { |
2065 | packet_send_debug("X11 forwarding disabled; " | |
2066 | "not compatible with UseLogin=yes."); | |
2067 | return 0; | |
2068 | } | |
b44de2b1 | 2069 | if (s->display != NULL) { |
8dcd9d5c | 2070 | debug("X11 display already set."); |
2071 | return 0; | |
2072 | } | |
57f228e8 | 2073 | if (x11_create_display_inet(options.x11_display_offset, |
2074 | options.x11_use_localhost, s->single_connection, | |
2075 | &s->display_number) == -1) { | |
b44de2b1 | 2076 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 2077 | return 0; |
2078 | } | |
c9d0ad9b | 2079 | |
2080 | /* Set up a suitable value for the DISPLAY variable. */ | |
2081 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2082 | fatal("gethostname: %.100s", strerror(errno)); | |
2083 | /* | |
2084 | * auth_display must be used as the displayname when the | |
2085 | * authorization entry is added with xauth(1). This will be | |
2086 | * different than the DISPLAY string for localhost displays. | |
2087 | */ | |
e6e573bd | 2088 | if (options.x11_use_localhost) { |
57f228e8 | 2089 | snprintf(display, sizeof display, "localhost:%u.%u", |
c9d0ad9b | 2090 | s->display_number, s->screen); |
57f228e8 | 2091 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
f9314d9a | 2092 | s->display_number, s->screen); |
c9d0ad9b | 2093 | s->display = xstrdup(display); |
f9314d9a | 2094 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 2095 | } else { |
2096 | #ifdef IPADDR_IN_DISPLAY | |
2097 | struct hostent *he; | |
2098 | struct in_addr my_addr; | |
2099 | ||
2100 | he = gethostbyname(hostname); | |
2101 | if (he == NULL) { | |
2102 | error("Can't get IP address for X11 DISPLAY."); | |
2103 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2104 | return 0; | |
2105 | } | |
2106 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
57f228e8 | 2107 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
c9d0ad9b | 2108 | s->display_number, s->screen); |
2109 | #else | |
57f228e8 | 2110 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
c9d0ad9b | 2111 | s->display_number, s->screen); |
2112 | #endif | |
2113 | s->display = xstrdup(display); | |
f9314d9a | 2114 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2115 | } |
2116 | ||
8dcd9d5c | 2117 | return 1; |
2118 | } | |
2119 | ||
396c147e | 2120 | static void |
59c97189 | 2121 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2122 | { |
57156994 | 2123 | server_loop2(authctxt); |
e78a59f5 | 2124 | } |