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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" | |
678143bd | 36 | RCSID("$OpenBSD: session.c,v 1.191 2005/12/24 02:27:41 djm 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" | |
61a2c1da | 45 | #include "match.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" |
07200973 | 59 | #include "kex.h" |
1853d1ef | 60 | #include "monitor_wrap.h" |
e78a59f5 | 61 | |
bcfcc5f9 | 62 | #if defined(KRB5) && defined(USE_AFS) |
39dfceeb | 63 | #include <kafs.h> |
64 | #endif | |
65 | ||
7364bd04 | 66 | #ifdef GSSAPI |
67 | #include "ssh-gss.h" | |
68 | #endif | |
69 | ||
7368a6c8 | 70 | /* func */ |
71 | ||
72 | Session *session_new(void); | |
9c328529 | 73 | void session_set_fds(Session *, int, int, int); |
2362db19 | 74 | void session_pty_cleanup(Session *); |
9c328529 | 75 | void session_proctitle(Session *); |
76 | int session_setup_x11fwd(Session *); | |
77 | void do_exec_pty(Session *, const char *); | |
78 | void do_exec_no_pty(Session *, const char *); | |
79 | void do_exec(Session *, const char *); | |
80 | void do_login(Session *, const char *); | |
8a9ac95d | 81 | #ifdef LOGIN_NEEDS_UTMPX |
82 | static void do_pre_login(Session *s); | |
83 | #endif | |
9c328529 | 84 | void do_child(Session *, const char *); |
f2c2fd71 | 85 | void do_motd(void); |
9c328529 | 86 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 87 | |
396c147e | 88 | static void do_authenticated1(Authctxt *); |
89 | static void do_authenticated2(Authctxt *); | |
9c328529 | 90 | |
396c147e | 91 | static int session_pty_req(Session *); |
bb5639fe | 92 | |
7368a6c8 | 93 | /* import */ |
94 | extern ServerOptions options; | |
95 | extern char *__progname; | |
96 | extern int log_stderr; | |
97 | extern int debug_flag; | |
1e3b8b07 | 98 | extern u_int utmp_len; |
089fbbd2 | 99 | extern int startup_pipe; |
e78e738a | 100 | extern void destroy_sensitive_data(void); |
bc7dfc06 | 101 | extern Buffer loginmsg; |
089fbbd2 | 102 | |
b5e300c2 | 103 | /* original command from peer. */ |
c95add71 | 104 | const char *original_command = NULL; |
b5e300c2 | 105 | |
7368a6c8 | 106 | /* data */ |
107 | #define MAX_SESSIONS 10 | |
108 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 109 | |
2e73a022 | 110 | #ifdef HAVE_LOGIN_CAP |
1836f69f | 111 | login_cap_t *lc; |
2e73a022 | 112 | #endif |
113 | ||
2362db19 | 114 | static int is_child = 0; |
115 | ||
149cdb60 | 116 | /* Name and directory of socket for authentication agent forwarding. */ |
117 | static char *auth_sock_name = NULL; | |
118 | static char *auth_sock_dir = NULL; | |
119 | ||
120 | /* removes the agent forwarding socket */ | |
121 | ||
122 | static void | |
2362db19 | 123 | auth_sock_cleanup_proc(struct passwd *pw) |
149cdb60 | 124 | { |
149cdb60 | 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); | |
c88de854 | 152 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
149cdb60 | 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 | |
149cdb60 | 168 | /* Create the socket. */ |
169 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
170 | if (sock < 0) | |
171 | packet_disconnect("socket: %.100s", strerror(errno)); | |
172 | ||
173 | /* Bind it to the name. */ | |
174 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
175 | sunaddr.sun_family = AF_UNIX; | |
176 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
177 | ||
178 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
179 | packet_disconnect("bind: %.100s", strerror(errno)); | |
180 | ||
181 | /* Restore the privileged uid. */ | |
182 | restore_uid(); | |
183 | ||
184 | /* Start listening on the socket. */ | |
fce39749 | 185 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
149cdb60 | 186 | packet_disconnect("listen: %.100s", strerror(errno)); |
187 | ||
188 | /* Allocate a channel for the authentication agent socket. */ | |
189 | nc = channel_new("auth socket", | |
190 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
191 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 192 | 0, "auth socket", 1); |
149cdb60 | 193 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
194 | return 1; | |
195 | } | |
196 | ||
dd1fb864 | 197 | static void |
198 | display_loginmsg(void) | |
199 | { | |
56964485 | 200 | if (buffer_len(&loginmsg) > 0) { |
201 | buffer_append(&loginmsg, "\0", 1); | |
202 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
203 | buffer_clear(&loginmsg); | |
204 | } | |
dd1fb864 | 205 | } |
149cdb60 | 206 | |
bb5639fe | 207 | void |
208 | do_authenticated(Authctxt *authctxt) | |
209 | { | |
381b021b | 210 | setproctitle("%s", authctxt->pw->pw_name); |
211 | ||
bb5639fe | 212 | /* setup the channel layer */ |
213 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
214 | channel_permit_all_opens(); | |
215 | ||
216 | if (compat20) | |
217 | do_authenticated2(authctxt); | |
218 | else | |
219 | do_authenticated1(authctxt); | |
e4f7282d | 220 | |
2362db19 | 221 | do_cleanup(authctxt); |
bb5639fe | 222 | } |
223 | ||
7368a6c8 | 224 | /* |
225 | * Prepares for an interactive session. This is called after the user has | |
226 | * been successfully authenticated. During this message exchange, pseudo | |
227 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
228 | * are requested, etc. | |
229 | */ | |
396c147e | 230 | static void |
bb5639fe | 231 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 232 | { |
233 | Session *s; | |
7368a6c8 | 234 | char *command; |
54a5250f | 235 | int success, type, screen_flag; |
7138ebd9 | 236 | int enable_compression_after_reply = 0; |
237 | u_int proto_len, data_len, dlen, compression_level = 0; | |
7368a6c8 | 238 | |
239 | s = session_new(); | |
b0042027 | 240 | if (s == NULL) { |
241 | error("no more sessions"); | |
242 | return; | |
243 | } | |
ced49be2 | 244 | s->authctxt = authctxt; |
bb5639fe | 245 | s->pw = authctxt->pw; |
2e73a022 | 246 | |
7368a6c8 | 247 | /* |
248 | * We stay in this loop until the client requests to execute a shell | |
249 | * or a command. | |
250 | */ | |
251 | for (;;) { | |
bb5639fe | 252 | success = 0; |
7368a6c8 | 253 | |
254 | /* Get a packet from the client. */ | |
54a5250f | 255 | type = packet_read(); |
7368a6c8 | 256 | |
257 | /* Process the packet. */ | |
258 | switch (type) { | |
259 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 260 | compression_level = packet_get_int(); |
95500969 | 261 | packet_check_eom(); |
7368a6c8 | 262 | if (compression_level < 1 || compression_level > 9) { |
d77347cc | 263 | packet_send_debug("Received invalid compression level %d.", |
184eed6a | 264 | compression_level); |
7368a6c8 | 265 | break; |
266 | } | |
07200973 | 267 | if (options.compression == COMP_NONE) { |
636f76ca | 268 | debug2("compression disabled"); |
269 | break; | |
270 | } | |
7368a6c8 | 271 | /* Enable compression after we have responded with SUCCESS. */ |
272 | enable_compression_after_reply = 1; | |
273 | success = 1; | |
274 | break; | |
275 | ||
276 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 277 | success = session_pty_req(s); |
7368a6c8 | 278 | break; |
279 | ||
280 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 281 | s->auth_proto = packet_get_string(&proto_len); |
282 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 283 | |
2af09193 | 284 | screen_flag = packet_get_protocol_flags() & |
285 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
286 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
287 | ||
288 | if (packet_remaining() == 4) { | |
289 | if (!screen_flag) | |
290 | debug2("Buggy client: " | |
291 | "X11 screen flag missing"); | |
7368a6c8 | 292 | s->screen = packet_get_int(); |
c8b058b4 | 293 | } else { |
7368a6c8 | 294 | s->screen = 0; |
c8b058b4 | 295 | } |
95500969 | 296 | packet_check_eom(); |
8dcd9d5c | 297 | success = session_setup_x11fwd(s); |
298 | if (!success) { | |
299 | xfree(s->auth_proto); | |
300 | xfree(s->auth_data); | |
1500bcdd | 301 | s->auth_proto = NULL; |
302 | s->auth_data = NULL; | |
7368a6c8 | 303 | } |
7368a6c8 | 304 | break; |
7368a6c8 | 305 | |
306 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
307 | if (no_agent_forwarding_flag || compat13) { | |
308 | debug("Authentication agent forwarding not permitted for this authentication."); | |
309 | break; | |
310 | } | |
311 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 312 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 313 | break; |
314 | ||
315 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
316 | if (no_port_forwarding_flag) { | |
317 | debug("Port forwarding not permitted for this authentication."); | |
318 | break; | |
319 | } | |
33de75a3 | 320 | if (!options.allow_tcp_forwarding) { |
321 | debug("Port forwarding not permitted."); | |
322 | break; | |
323 | } | |
7368a6c8 | 324 | debug("Received TCP/IP port forwarding request."); |
bb5639fe | 325 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 326 | success = 1; |
327 | break; | |
328 | ||
329 | case SSH_CMSG_MAX_PACKET_SIZE: | |
330 | if (packet_set_maxsize(packet_get_int()) > 0) | |
331 | success = 1; | |
332 | break; | |
184eed6a | 333 | |
7368a6c8 | 334 | case SSH_CMSG_EXEC_SHELL: |
335 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 336 | if (type == SSH_CMSG_EXEC_CMD) { |
337 | command = packet_get_string(&dlen); | |
338 | debug("Exec command '%.500s'", command); | |
c95add71 | 339 | do_exec(s, command); |
340 | xfree(command); | |
7368a6c8 | 341 | } else { |
c95add71 | 342 | do_exec(s, NULL); |
7368a6c8 | 343 | } |
95500969 | 344 | packet_check_eom(); |
fc2a1d28 | 345 | session_close(s); |
7368a6c8 | 346 | return; |
347 | ||
348 | default: | |
349 | /* | |
350 | * Any unknown messages in this phase are ignored, | |
351 | * and a failure message is returned. | |
352 | */ | |
bbe88b6d | 353 | logit("Unknown packet type received after authentication: %d", type); |
7368a6c8 | 354 | } |
355 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
356 | packet_send(); | |
357 | packet_write_wait(); | |
358 | ||
359 | /* Enable compression now that we have replied if appropriate. */ | |
360 | if (enable_compression_after_reply) { | |
361 | enable_compression_after_reply = 0; | |
362 | packet_start_compression(compression_level); | |
363 | } | |
364 | } | |
365 | } | |
366 | ||
367 | /* | |
368 | * This is called to fork and execute a command when we have no tty. This | |
369 | * will call do_child from the child, and server_loop from the parent after | |
370 | * setting up file descriptors and such. | |
371 | */ | |
6ae2364d | 372 | void |
65068d16 | 373 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 374 | { |
c457707e | 375 | pid_t pid; |
7368a6c8 | 376 | |
377 | #ifdef USE_PIPES | |
378 | int pin[2], pout[2], perr[2]; | |
379 | /* Allocate pipes for communicating with the program. */ | |
380 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
381 | packet_disconnect("Could not create pipes: %.100s", | |
382 | strerror(errno)); | |
383 | #else /* USE_PIPES */ | |
384 | int inout[2], err[2]; | |
385 | /* Uses socket pairs to communicate with the program. */ | |
386 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
387 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
388 | packet_disconnect("Could not create socket pairs: %.100s", | |
389 | strerror(errno)); | |
390 | #endif /* USE_PIPES */ | |
391 | if (s == NULL) | |
392 | fatal("do_exec_no_pty: no session"); | |
393 | ||
1d1ffb87 | 394 | session_proctitle(s); |
7368a6c8 | 395 | |
b19d61d7 | 396 | #if defined(USE_PAM) |
59f327e0 | 397 | if (options.use_pam && !use_privsep) |
7fceb20d | 398 | do_pam_setcred(1); |
266140a8 | 399 | #endif /* USE_PAM */ |
400 | ||
7368a6c8 | 401 | /* Fork the child. */ |
402 | if ((pid = fork()) == 0) { | |
2362db19 | 403 | is_child = 1; |
516f0d7d | 404 | |
7368a6c8 | 405 | /* Child. Reinitialize the log since the pid has changed. */ |
406 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
407 | ||
408 | /* | |
409 | * Create a new session and process group since the 4.4BSD | |
410 | * setlogin() affects the entire process group. | |
411 | */ | |
412 | if (setsid() < 0) | |
413 | error("setsid failed: %.100s", strerror(errno)); | |
414 | ||
415 | #ifdef USE_PIPES | |
416 | /* | |
417 | * Redirect stdin. We close the parent side of the socket | |
418 | * pair, and make the child side the standard input. | |
419 | */ | |
420 | close(pin[1]); | |
421 | if (dup2(pin[0], 0) < 0) | |
422 | perror("dup2 stdin"); | |
423 | close(pin[0]); | |
424 | ||
425 | /* Redirect stdout. */ | |
426 | close(pout[0]); | |
427 | if (dup2(pout[1], 1) < 0) | |
428 | perror("dup2 stdout"); | |
429 | close(pout[1]); | |
430 | ||
431 | /* Redirect stderr. */ | |
432 | close(perr[0]); | |
433 | if (dup2(perr[1], 2) < 0) | |
434 | perror("dup2 stderr"); | |
435 | close(perr[1]); | |
436 | #else /* USE_PIPES */ | |
437 | /* | |
438 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
439 | * use the same socket, as some programs (particularly rdist) | |
440 | * seem to depend on it. | |
441 | */ | |
442 | close(inout[1]); | |
443 | close(err[1]); | |
444 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
445 | perror("dup2 stdin"); | |
446 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
447 | perror("dup2 stdout"); | |
448 | if (dup2(err[0], 2) < 0) /* stderr */ | |
449 | perror("dup2 stderr"); | |
450 | #endif /* USE_PIPES */ | |
451 | ||
ef51930f | 452 | #ifdef _UNICOS |
453 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
454 | #endif | |
455 | ||
7368a6c8 | 456 | /* Do processing for the child (exec command etc). */ |
56b3e9ce | 457 | do_child(s, command); |
7368a6c8 | 458 | /* NOTREACHED */ |
459 | } | |
ef51930f | 460 | #ifdef _UNICOS |
461 | signal(WJSIGNAL, cray_job_termination_handler); | |
462 | #endif /* _UNICOS */ | |
3c62e7eb | 463 | #ifdef HAVE_CYGWIN |
464 | if (is_winnt) | |
465 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
466 | #endif | |
7368a6c8 | 467 | if (pid < 0) |
468 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
469 | s->pid = pid; | |
b5c334cc | 470 | /* Set interactive/non-interactive mode. */ |
471 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 472 | #ifdef USE_PIPES |
473 | /* We are the parent. Close the child sides of the pipes. */ | |
474 | close(pin[0]); | |
475 | close(pout[1]); | |
476 | close(perr[1]); | |
477 | ||
e78a59f5 | 478 | if (compat20) { |
d7ecbe88 | 479 | if (s->is_subsystem) { |
480 | close(perr[0]); | |
481 | perr[0] = -1; | |
482 | } | |
483 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
e78a59f5 | 484 | } else { |
485 | /* Enter the interactive session. */ | |
486 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 487 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 488 | } |
7368a6c8 | 489 | #else /* USE_PIPES */ |
490 | /* We are the parent. Close the child sides of the socket pairs. */ | |
491 | close(inout[0]); | |
492 | close(err[0]); | |
493 | ||
75dbfa01 | 494 | /* |
495 | * Clear loginmsg, since it's the child's responsibility to display | |
496 | * it to the user, otherwise multiple sessions may accumulate | |
497 | * multiple copies of the login messages. | |
498 | */ | |
499 | buffer_clear(&loginmsg); | |
500 | ||
7368a6c8 | 501 | /* |
502 | * Enter the interactive session. Note: server_loop must be able to | |
503 | * handle the case that fdin and fdout are the same. | |
504 | */ | |
e78a59f5 | 505 | if (compat20) { |
e5d7a405 | 506 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 507 | } else { |
508 | server_loop(pid, inout[1], inout[1], err[1]); | |
509 | /* server_loop has closed inout[1] and err[1]. */ | |
510 | } | |
7368a6c8 | 511 | #endif /* USE_PIPES */ |
512 | } | |
513 | ||
514 | /* | |
515 | * This is called to fork and execute a command when we have a tty. This | |
516 | * will call do_child from the child, and server_loop from the parent after | |
517 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
518 | * lastlog, and other such operations. | |
519 | */ | |
6ae2364d | 520 | void |
65068d16 | 521 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 522 | { |
7368a6c8 | 523 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 524 | pid_t pid; |
7368a6c8 | 525 | |
526 | if (s == NULL) | |
527 | fatal("do_exec_pty: no session"); | |
528 | ptyfd = s->ptyfd; | |
529 | ttyfd = s->ttyfd; | |
530 | ||
b19d61d7 | 531 | #if defined(USE_PAM) |
7fceb20d | 532 | if (options.use_pam) { |
49e82bb9 | 533 | do_pam_set_tty(s->tty); |
72037bc8 | 534 | if (!use_privsep) |
535 | do_pam_setcred(1); | |
7fceb20d | 536 | } |
27cf96de | 537 | #endif |
266140a8 | 538 | |
7368a6c8 | 539 | /* Fork the child. */ |
540 | if ((pid = fork()) == 0) { | |
2362db19 | 541 | is_child = 1; |
57156994 | 542 | |
c345cf9d | 543 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 544 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 545 | /* Close the master side of the pseudo tty. */ |
546 | close(ptyfd); | |
547 | ||
548 | /* Make the pseudo tty our controlling tty. */ | |
549 | pty_make_controlling_tty(&ttyfd, s->tty); | |
550 | ||
05fd093c | 551 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
552 | if (dup2(ttyfd, 0) < 0) | |
553 | error("dup2 stdin: %s", strerror(errno)); | |
554 | if (dup2(ttyfd, 1) < 0) | |
555 | error("dup2 stdout: %s", strerror(errno)); | |
556 | if (dup2(ttyfd, 2) < 0) | |
557 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 558 | |
559 | /* Close the extra descriptor for the pseudo tty. */ | |
560 | close(ttyfd); | |
561 | ||
c345cf9d | 562 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 563 | #ifndef HAVE_OSF_SIA |
ef51930f | 564 | if (!(options.use_login && command == NULL)) { |
565 | #ifdef _UNICOS | |
566 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
567 | #endif /* _UNICOS */ | |
a22aff1f | 568 | do_login(s, command); |
ef51930f | 569 | } |
7e2d5fa4 | 570 | # ifdef LOGIN_NEEDS_UTMPX |
571 | else | |
572 | do_pre_login(s); | |
573 | # endif | |
c96a4aaf | 574 | #endif |
7368a6c8 | 575 | |
7368a6c8 | 576 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 577 | do_child(s, command); |
7368a6c8 | 578 | /* NOTREACHED */ |
579 | } | |
ef51930f | 580 | #ifdef _UNICOS |
581 | signal(WJSIGNAL, cray_job_termination_handler); | |
582 | #endif /* _UNICOS */ | |
3c62e7eb | 583 | #ifdef HAVE_CYGWIN |
584 | if (is_winnt) | |
585 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
586 | #endif | |
7368a6c8 | 587 | if (pid < 0) |
588 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
589 | s->pid = pid; | |
590 | ||
591 | /* Parent. Close the slave side of the pseudo tty. */ | |
592 | close(ttyfd); | |
593 | ||
594 | /* | |
595 | * Create another descriptor of the pty master side for use as the | |
596 | * standard input. We could use the original descriptor, but this | |
597 | * simplifies code in server_loop. The descriptor is bidirectional. | |
598 | */ | |
599 | fdout = dup(ptyfd); | |
600 | if (fdout < 0) | |
601 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
602 | ||
603 | /* we keep a reference to the pty master */ | |
604 | ptymaster = dup(ptyfd); | |
605 | if (ptymaster < 0) | |
606 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
607 | s->ptymaster = ptymaster; | |
608 | ||
609 | /* Enter interactive session. */ | |
b5c334cc | 610 | packet_set_interactive(1); |
e78a59f5 | 611 | if (compat20) { |
612 | session_set_fds(s, ptyfd, fdout, -1); | |
613 | } else { | |
614 | server_loop(pid, ptyfd, fdout, -1); | |
615 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 616 | } |
7368a6c8 | 617 | } |
618 | ||
7e2d5fa4 | 619 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 620 | static void |
7e2d5fa4 | 621 | do_pre_login(Session *s) |
622 | { | |
623 | socklen_t fromlen; | |
624 | struct sockaddr_storage from; | |
625 | pid_t pid = getpid(); | |
626 | ||
627 | /* | |
628 | * Get IP address of client. If the connection is not a socket, let | |
629 | * the address be 0.0.0.0. | |
630 | */ | |
631 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 632 | fromlen = sizeof(from); |
7e2d5fa4 | 633 | if (packet_connection_is_on_socket()) { |
7e2d5fa4 | 634 | if (getpeername(packet_get_connection_in(), |
184eed6a | 635 | (struct sockaddr *) & from, &fromlen) < 0) { |
7e2d5fa4 | 636 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 637 | cleanup_exit(255); |
7e2d5fa4 | 638 | } |
639 | } | |
640 | ||
641 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
c5a7d788 | 642 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d4ac26ed | 643 | (struct sockaddr *)&from, fromlen); |
7e2d5fa4 | 644 | } |
645 | #endif | |
646 | ||
dac6753b | 647 | /* |
648 | * This is called to fork and execute a command. If another command is | |
649 | * to be forced, execute that instead. | |
650 | */ | |
651 | void | |
652 | do_exec(Session *s, const char *command) | |
653 | { | |
654 | if (forced_command) { | |
655 | original_command = command; | |
656 | command = forced_command; | |
dac6753b | 657 | debug("Forced command '%.900s'", command); |
658 | } | |
659 | ||
6039eeef | 660 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 661 | if (command != NULL) |
662 | PRIVSEP(audit_run_command(command)); | |
663 | else if (s->ttyfd == -1) { | |
664 | char *shell = s->pw->pw_shell; | |
665 | ||
666 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
667 | shell =_PATH_BSHELL; | |
668 | PRIVSEP(audit_run_command(shell)); | |
669 | } | |
670 | #endif | |
671 | ||
dac6753b | 672 | if (s->ttyfd != -1) |
673 | do_exec_pty(s, command); | |
674 | else | |
675 | do_exec_no_pty(s, command); | |
676 | ||
c95add71 | 677 | original_command = NULL; |
dac6753b | 678 | |
be2ca0c9 | 679 | /* |
680 | * Clear loginmsg: it's the child's responsibility to display | |
681 | * it to the user, otherwise multiple sessions may accumulate | |
682 | * multiple copies of the login messages. | |
683 | */ | |
684 | buffer_clear(&loginmsg); | |
685 | } | |
f7342052 | 686 | |
c345cf9d | 687 | /* administrative, login(1)-like work */ |
688 | void | |
a22aff1f | 689 | do_login(Session *s, const char *command) |
c345cf9d | 690 | { |
c345cf9d | 691 | socklen_t fromlen; |
692 | struct sockaddr_storage from; | |
c345cf9d | 693 | struct passwd * pw = s->pw; |
694 | pid_t pid = getpid(); | |
695 | ||
696 | /* | |
697 | * Get IP address of client. If the connection is not a socket, let | |
698 | * the address be 0.0.0.0. | |
699 | */ | |
700 | memset(&from, 0, sizeof(from)); | |
d4ac26ed | 701 | fromlen = sizeof(from); |
c345cf9d | 702 | if (packet_connection_is_on_socket()) { |
c345cf9d | 703 | if (getpeername(packet_get_connection_in(), |
f7342052 | 704 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 705 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 706 | cleanup_exit(255); |
c345cf9d | 707 | } |
708 | } | |
709 | ||
710 | /* Record that there was a login on that tty from the remote host. */ | |
49a34e84 | 711 | if (!use_privsep) |
712 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
713 | get_remote_name_or_ip(utmp_len, | |
c5a7d788 | 714 | options.use_dns), |
ba1566dd | 715 | (struct sockaddr *)&from, fromlen); |
c345cf9d | 716 | |
2919e060 | 717 | #ifdef USE_PAM |
718 | /* | |
719 | * If password change is needed, do it now. | |
720 | * This needs to occur before the ~/.hushlogin check. | |
721 | */ | |
dd1fb864 | 722 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
723 | display_loginmsg(); | |
2919e060 | 724 | do_pam_chauthtok(); |
dd1fb864 | 725 | s->authctxt->force_pwchange = 0; |
5b9e2464 | 726 | /* XXX - signal [net] parent to enable forwardings */ |
2919e060 | 727 | } |
728 | #endif | |
729 | ||
f2c2fd71 | 730 | if (check_quietlogin(s, command)) |
c345cf9d | 731 | return; |
732 | ||
dd1fb864 | 733 | display_loginmsg(); |
c345cf9d | 734 | |
f2c2fd71 | 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 | ||
1db07e7d | 941 | void |
942 | copy_environment(char **source, char ***env, u_int *envsize) | |
7368a6c8 | 943 | { |
760b35a6 | 944 | char *var_name, *var_val; |
7368a6c8 | 945 | int i; |
946 | ||
760b35a6 | 947 | if (source == NULL) |
7368a6c8 | 948 | return; |
2b87da3b | 949 | |
760b35a6 | 950 | for(i = 0; source[i] != NULL; i++) { |
951 | var_name = xstrdup(source[i]); | |
952 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
953 | xfree(var_name); | |
7368a6c8 | 954 | continue; |
7368a6c8 | 955 | } |
760b35a6 | 956 | *var_val++ = '\0'; |
7368a6c8 | 957 | |
760b35a6 | 958 | debug3("Copy environment: %s=%s", var_name, var_val); |
959 | child_set_env(env, envsize, var_name, var_val); | |
b6453d99 | 960 | |
760b35a6 | 961 | xfree(var_name); |
22d89d24 | 962 | } |
963 | } | |
22d89d24 | 964 | |
f7342052 | 965 | static char ** |
966 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 967 | { |
7368a6c8 | 968 | char buf[256]; |
f7342052 | 969 | u_int i, envsize; |
95b99395 | 970 | char **env, *laddr, *path = NULL; |
f7342052 | 971 | struct passwd *pw = s->pw; |
7368a6c8 | 972 | |
7368a6c8 | 973 | /* Initialize the environment. */ |
974 | envsize = 100; | |
975 | env = xmalloc(envsize * sizeof(char *)); | |
976 | env[0] = NULL; | |
977 | ||
3c62e7eb | 978 | #ifdef HAVE_CYGWIN |
979 | /* | |
980 | * The Windows environment contains some setting which are | |
981 | * important for a running system. They must not be dropped. | |
982 | */ | |
3c502155 | 983 | { |
984 | char **p; | |
985 | ||
986 | p = fetch_windows_environment(); | |
987 | copy_environment(p, &env, &envsize); | |
988 | free_windows_environment(p); | |
989 | } | |
3c62e7eb | 990 | #endif |
991 | ||
7364bd04 | 992 | #ifdef GSSAPI |
aff51935 | 993 | /* Allow any GSSAPI methods that we've used to alter |
7364bd04 | 994 | * the childs environment as they see fit |
995 | */ | |
996 | ssh_gssapi_do_child(&env, &envsize); | |
997 | #endif | |
998 | ||
7368a6c8 | 999 | if (!options.use_login) { |
1000 | /* Set basic environment. */ | |
61a2c1da | 1001 | for (i = 0; i < s->num_env; i++) |
f2107e97 | 1002 | child_set_env(&env, &envsize, s->env[i].name, |
61a2c1da | 1003 | s->env[i].val); |
1004 | ||
7368a6c8 | 1005 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1006 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
17ed08c5 | 1007 | #ifdef _AIX |
1008 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1009 | #endif | |
7368a6c8 | 1010 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
2e73a022 | 1011 | #ifdef HAVE_LOGIN_CAP |
97686bf9 | 1012 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1013 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1014 | else | |
1015 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1016 | #else /* HAVE_LOGIN_CAP */ |
1017 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1018 | /* |
1019 | * There's no standard path on Windows. The path contains | |
1020 | * important components pointing to the system directories, | |
1021 | * needed for loading shared libraries. So the path better | |
1022 | * remains intact here. | |
1023 | */ | |
95b99395 | 1024 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1025 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1026 | path = child_get_env(env, "PATH"); | |
1027 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1028 | if (path == NULL || *path == '\0') { | |
aff51935 | 1029 | child_set_env(&env, &envsize, "PATH", |
95b99395 | 1030 | s->pw->pw_uid == 0 ? |
1031 | SUPERUSER_PATH : _PATH_STDPATH); | |
1032 | } | |
22d89d24 | 1033 | # endif /* HAVE_CYGWIN */ |
1034 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1035 | |
1036 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1037 | _PATH_MAILDIR, pw->pw_name); | |
1038 | child_set_env(&env, &envsize, "MAIL", buf); | |
1039 | ||
1040 | /* Normal systems set SHELL by default. */ | |
1041 | child_set_env(&env, &envsize, "SHELL", shell); | |
1042 | } | |
1043 | if (getenv("TZ")) | |
1044 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1045 | ||
1046 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 1047 | if (!options.use_login) { |
1048 | while (custom_environment) { | |
1049 | struct envstring *ce = custom_environment; | |
7fdc56c5 | 1050 | char *str = ce->s; |
f7342052 | 1051 | |
7fdc56c5 | 1052 | for (i = 0; str[i] != '=' && str[i]; i++) |
2548961d | 1053 | ; |
7fdc56c5 | 1054 | if (str[i] == '=') { |
1055 | str[i] = 0; | |
1056 | child_set_env(&env, &envsize, str, str + i + 1); | |
2548961d | 1057 | } |
1058 | custom_environment = ce->next; | |
1059 | xfree(ce->s); | |
1060 | xfree(ce); | |
7368a6c8 | 1061 | } |
7368a6c8 | 1062 | } |
1063 | ||
da0561eb | 1064 | /* SSH_CLIENT deprecated */ |
7368a6c8 | 1065 | snprintf(buf, sizeof buf, "%.50s %d %d", |
f7342052 | 1066 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1067 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1068 | ||
3e2f2431 | 1069 | laddr = get_local_ipaddr(packet_get_connection_in()); |
da0561eb | 1070 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
3e2f2431 | 1071 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1072 | xfree(laddr); | |
da0561eb | 1073 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1074 | ||
56b3e9ce | 1075 | if (s->ttyfd != -1) |
1076 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1077 | if (s->term) | |
1078 | child_set_env(&env, &envsize, "TERM", s->term); | |
1079 | if (s->display) | |
1080 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1081 | if (original_command) |
1082 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1083 | original_command); | |
7368a6c8 | 1084 | |
ef51930f | 1085 | #ifdef _UNICOS |
1086 | if (cray_tmpdir[0] != '\0') | |
1087 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1088 | #endif /* _UNICOS */ | |
1089 | ||
3bfd27d5 | 1090 | /* |
1091 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1092 | * must have been set by a native authentication method (eg AIX or | |
1093 | * SIA), so copy it to the child. | |
1094 | */ | |
1095 | { | |
1096 | char *cp; | |
1097 | ||
1098 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1099 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1100 | } | |
1101 | ||
7368a6c8 | 1102 | #ifdef _AIX |
4936fcee | 1103 | { |
1104 | char *cp; | |
1105 | ||
1106 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1107 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
4936fcee | 1108 | read_environment_file(&env, &envsize, "/etc/environment"); |
1109 | } | |
7368a6c8 | 1110 | #endif |
ced49be2 | 1111 | #ifdef KRB5 |
6490a5d5 | 1112 | if (s->authctxt->krb5_ccname) |
ced49be2 | 1113 | child_set_env(&env, &envsize, "KRB5CCNAME", |
6490a5d5 | 1114 | s->authctxt->krb5_ccname); |
ced49be2 | 1115 | #endif |
7368a6c8 | 1116 | #ifdef USE_PAM |
ee48c949 | 1117 | /* |
1118 | * Pull in any environment variables that may have | |
1119 | * been set by PAM. | |
1120 | */ | |
7fceb20d | 1121 | if (options.use_pam) { |
2212fc98 | 1122 | char **p; |
b6453d99 | 1123 | |
2212fc98 | 1124 | p = fetch_pam_child_environment(); |
1125 | copy_environment(p, &env, &envsize); | |
1126 | free_pam_environment(p); | |
ee48c949 | 1127 | |
2212fc98 | 1128 | p = fetch_pam_environment(); |
ee48c949 | 1129 | copy_environment(p, &env, &envsize); |
1130 | free_pam_environment(p); | |
1131 | } | |
7368a6c8 | 1132 | #endif /* USE_PAM */ |
1133 | ||
149cdb60 | 1134 | if (auth_sock_name != NULL) |
7368a6c8 | 1135 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1136 | auth_sock_name); |
7368a6c8 | 1137 | |
1138 | /* read $HOME/.ssh/environment. */ | |
f00bab84 | 1139 | if (options.permit_user_env && !options.use_login) { |
71276795 | 1140 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e2e36358 | 1141 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
7368a6c8 | 1142 | read_environment_file(&env, &envsize, buf); |
1143 | } | |
1144 | if (debug_flag) { | |
1145 | /* dump the environment */ | |
1146 | fprintf(stderr, "Environment:\n"); | |
1147 | for (i = 0; env[i]; i++) | |
1148 | fprintf(stderr, " %.200s\n", env[i]); | |
1149 | } | |
f7342052 | 1150 | return env; |
1151 | } | |
1152 | ||
1153 | /* | |
1154 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1155 | * first in this order). | |
1156 | */ | |
1157 | static void | |
1158 | do_rc_files(Session *s, const char *shell) | |
1159 | { | |
1160 | FILE *f = NULL; | |
1161 | char cmd[1024]; | |
1162 | int do_xauth; | |
1163 | struct stat st; | |
1164 | ||
1165 | do_xauth = | |
1166 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1167 | ||
1168 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1169 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1170 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1171 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1172 | if (debug_flag) | |
1173 | fprintf(stderr, "Running %s\n", cmd); | |
1174 | f = popen(cmd, "w"); | |
1175 | if (f) { | |
1176 | if (do_xauth) | |
1177 | fprintf(f, "%s %s\n", s->auth_proto, | |
1178 | s->auth_data); | |
1179 | pclose(f); | |
1180 | } else | |
1181 | fprintf(stderr, "Could not run %s\n", | |
1182 | _PATH_SSH_USER_RC); | |
1183 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1184 | if (debug_flag) | |
1185 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1186 | _PATH_SSH_SYSTEM_RC); | |
1187 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1188 | if (f) { | |
1189 | if (do_xauth) | |
1190 | fprintf(f, "%s %s\n", s->auth_proto, | |
1191 | s->auth_data); | |
1192 | pclose(f); | |
1193 | } else | |
1194 | fprintf(stderr, "Could not run %s\n", | |
1195 | _PATH_SSH_SYSTEM_RC); | |
1196 | } else if (do_xauth && options.xauth_location != NULL) { | |
1197 | /* Add authority data to .Xauthority if appropriate. */ | |
1198 | if (debug_flag) { | |
1199 | fprintf(stderr, | |
fe661d8f | 1200 | "Running %.500s remove %.100s\n", |
2362db19 | 1201 | options.xauth_location, s->auth_display); |
fe661d8f | 1202 | fprintf(stderr, |
1203 | "%.500s add %.100s %.100s %.100s\n", | |
f7342052 | 1204 | options.xauth_location, s->auth_display, |
1205 | s->auth_proto, s->auth_data); | |
1206 | } | |
1207 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1208 | options.xauth_location); | |
1209 | f = popen(cmd, "w"); | |
1210 | if (f) { | |
fe661d8f | 1211 | fprintf(f, "remove %s\n", |
1212 | s->auth_display); | |
f7342052 | 1213 | fprintf(f, "add %s %s %s\n", |
1214 | s->auth_display, s->auth_proto, | |
1215 | s->auth_data); | |
1216 | pclose(f); | |
1217 | } else { | |
1218 | fprintf(stderr, "Could not run %s\n", | |
1219 | cmd); | |
1220 | } | |
1221 | } | |
1222 | } | |
1223 | ||
1224 | static void | |
1225 | do_nologin(struct passwd *pw) | |
1226 | { | |
1227 | FILE *f = NULL; | |
1228 | char buf[1024]; | |
1229 | ||
1230 | #ifdef HAVE_LOGIN_CAP | |
1231 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1232 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1233 | _PATH_NOLOGIN), "r"); | |
1234 | #else | |
1235 | if (pw->pw_uid) | |
1236 | f = fopen(_PATH_NOLOGIN, "r"); | |
1237 | #endif | |
1238 | if (f) { | |
1239 | /* /etc/nologin exists. Print its contents and exit. */ | |
bbe88b6d | 1240 | logit("User %.100s not allowed because %s exists", |
8bd4e2ae | 1241 | pw->pw_name, _PATH_NOLOGIN); |
f7342052 | 1242 | while (fgets(buf, sizeof(buf), f)) |
1243 | fputs(buf, stderr); | |
1244 | fclose(f); | |
99f4fb69 | 1245 | fflush(NULL); |
f7342052 | 1246 | exit(254); |
1247 | } | |
1248 | } | |
1249 | ||
1250 | /* Set login name, uid, gid, and groups. */ | |
1853d1ef | 1251 | void |
f7342052 | 1252 | do_setusercontext(struct passwd *pw) |
1253 | { | |
2731632a | 1254 | #ifndef HAVE_CYGWIN |
1255 | if (getuid() == 0 || geteuid() == 0) | |
f7342052 | 1256 | #endif /* HAVE_CYGWIN */ |
2731632a | 1257 | { |
1258 | ||
8bbfc882 | 1259 | #ifdef HAVE_SETPCRED |
166baacc | 1260 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1261 | fatal("Failed to set process credentials"); | |
8bbfc882 | 1262 | #endif /* HAVE_SETPCRED */ |
f7342052 | 1263 | #ifdef HAVE_LOGIN_CAP |
2d199535 | 1264 | # ifdef __bsdi__ |
8695f9f7 | 1265 | setpgid(0, 0); |
2d199535 | 1266 | # endif |
09d7ebd1 | 1267 | #ifdef GSSAPI |
1268 | if (options.gss_authentication) { | |
1269 | temporarily_use_uid(pw); | |
1270 | ssh_gssapi_storecreds(); | |
1271 | restore_uid(); | |
1272 | } | |
1273 | #endif | |
f4eaee12 | 1274 | # ifdef USE_PAM |
1275 | if (options.use_pam) { | |
1276 | do_pam_session(); | |
1277 | do_pam_setcred(0); | |
1278 | } | |
1279 | # endif /* USE_PAM */ | |
f7342052 | 1280 | if (setusercontext(lc, pw, pw->pw_uid, |
1281 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1282 | perror("unable to set user context"); | |
1283 | exit(1); | |
1284 | } | |
1285 | #else | |
1286 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1287 | /* Sets login uid for accounting */ | |
1288 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1289 | error("setluid: %s", strerror(errno)); | |
1290 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1291 | ||
1292 | if (setlogin(pw->pw_name) < 0) | |
1293 | error("setlogin failed: %s", strerror(errno)); | |
1294 | if (setgid(pw->pw_gid) < 0) { | |
1295 | perror("setgid"); | |
1296 | exit(1); | |
1297 | } | |
1298 | /* Initialize the group list. */ | |
1299 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1300 | perror("initgroups"); | |
1301 | exit(1); | |
1302 | } | |
1303 | endgrent(); | |
09d7ebd1 | 1304 | #ifdef GSSAPI |
1305 | if (options.gss_authentication) { | |
1306 | temporarily_use_uid(pw); | |
1307 | ssh_gssapi_storecreds(); | |
1308 | restore_uid(); | |
1309 | } | |
1310 | #endif | |
f7342052 | 1311 | # ifdef USE_PAM |
1312 | /* | |
aff51935 | 1313 | * PAM credentials may take the form of supplementary groups. |
f7342052 | 1314 | * These will have been wiped by the above initgroups() call. |
1315 | * Reestablish them here. | |
1316 | */ | |
49e82bb9 | 1317 | if (options.use_pam) { |
1318 | do_pam_session(); | |
7fceb20d | 1319 | do_pam_setcred(0); |
49e82bb9 | 1320 | } |
f7342052 | 1321 | # endif /* USE_PAM */ |
1322 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1323 | irix_setusercontext(pw); | |
1324 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
e2bc41f9 | 1325 | # ifdef _AIX |
0ba40daa | 1326 | aix_usrinfo(pw); |
e2bc41f9 | 1327 | # endif /* _AIX */ |
26d07095 | 1328 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
4c653d8e | 1329 | if (set_id(pw->pw_name) != 0) { |
1330 | exit(1); | |
1331 | } | |
26d07095 | 1332 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ |
f7342052 | 1333 | /* Permanently switch to the desired uid. */ |
1334 | permanently_set_uid(pw); | |
1335 | #endif | |
1336 | } | |
2731632a | 1337 | |
1338 | #ifdef HAVE_CYGWIN | |
1339 | if (is_winnt) | |
1340 | #endif | |
f7342052 | 1341 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1342 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1343 | } | |
1344 | ||
37656beb | 1345 | static void |
1346 | do_pwchange(Session *s) | |
1347 | { | |
be2ca0c9 | 1348 | fflush(NULL); |
37656beb | 1349 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1350 | if (s->ttyfd != -1) { | |
f2107e97 | 1351 | fprintf(stderr, |
37656beb | 1352 | "You must change your password now and login again!\n"); |
3ade3b57 | 1353 | #ifdef PASSWD_NEEDS_USERNAME |
1354 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1355 | (char *)NULL); | |
1356 | #else | |
37656beb | 1357 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
3ade3b57 | 1358 | #endif |
37656beb | 1359 | perror("passwd"); |
1360 | } else { | |
1361 | fprintf(stderr, | |
1362 | "Password change required but no TTY available.\n"); | |
1363 | } | |
1364 | exit(1); | |
1365 | } | |
1366 | ||
51aeb639 | 1367 | static void |
1853d1ef | 1368 | launch_login(struct passwd *pw, const char *hostname) |
1369 | { | |
1370 | /* Launch login(1). */ | |
1371 | ||
85cc9118 | 1372 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1373 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1374 | (s->term ? s->term : "unknown"), |
1853d1ef | 1375 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1376 | #ifdef LOGIN_NO_ENDOPT |
1377 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1378 | #else | |
1853d1ef | 1379 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1380 | #endif |
1853d1ef | 1381 | |
1382 | /* Login couldn't be executed, die. */ | |
1383 | ||
1384 | perror("login"); | |
1385 | exit(1); | |
1386 | } | |
1387 | ||
37656beb | 1388 | static void |
1389 | child_close_fds(void) | |
1390 | { | |
1391 | int i; | |
1392 | ||
1393 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1394 | close(packet_get_connection_in()); | |
1395 | else { | |
1396 | close(packet_get_connection_in()); | |
1397 | close(packet_get_connection_out()); | |
1398 | } | |
1399 | /* | |
1400 | * Close all descriptors related to channels. They will still remain | |
1401 | * open in the parent. | |
1402 | */ | |
1403 | /* XXX better use close-on-exec? -markus */ | |
1404 | channel_close_all(); | |
1405 | ||
1406 | /* | |
1407 | * Close any extra file descriptors. Note that there may still be | |
1408 | * descriptors left by system functions. They will be closed later. | |
1409 | */ | |
1410 | endpwent(); | |
1411 | ||
1412 | /* | |
7b9b0103 | 1413 | * Close any extra open file descriptors so that we don't have them |
37656beb | 1414 | * hanging around in clients. Note that we want to do this after |
1415 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1416 | * descriptors open. | |
1417 | */ | |
1418 | for (i = 3; i < 64; i++) | |
1419 | close(i); | |
1420 | } | |
1421 | ||
f7342052 | 1422 | /* |
1423 | * Performs common processing for the child, such as setting up the | |
1424 | * environment, closing extra file descriptors, setting the user and group | |
1425 | * ids, and executing the command or shell. | |
1426 | */ | |
1427 | void | |
1428 | do_child(Session *s, const char *command) | |
1429 | { | |
1430 | extern char **environ; | |
1431 | char **env; | |
1432 | char *argv[10]; | |
1433 | const char *shell, *shell0, *hostname = NULL; | |
1434 | struct passwd *pw = s->pw; | |
f7342052 | 1435 | |
1436 | /* remove hostkey from the child's memory */ | |
1437 | destroy_sensitive_data(); | |
1438 | ||
37656beb | 1439 | /* Force a password change */ |
1440 | if (s->authctxt->force_pwchange) { | |
1441 | do_setusercontext(pw); | |
1442 | child_close_fds(); | |
1443 | do_pwchange(s); | |
1444 | exit(1); | |
1445 | } | |
1446 | ||
f7342052 | 1447 | /* login(1) is only called if we execute the login shell */ |
1448 | if (options.use_login && command != NULL) | |
1449 | options.use_login = 0; | |
1450 | ||
ef51930f | 1451 | #ifdef _UNICOS |
1452 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1453 | #endif /* _UNICOS */ | |
1454 | ||
f7342052 | 1455 | /* |
1456 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1457 | * switch, so we let login(1) to this for us. | |
1458 | */ | |
1459 | if (!options.use_login) { | |
1460 | #ifdef HAVE_OSF_SIA | |
58d0df4e | 1461 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
f7342052 | 1462 | if (!check_quietlogin(s, command)) |
1463 | do_motd(); | |
1464 | #else /* HAVE_OSF_SIA */ | |
0a61a240 | 1465 | /* When PAM is enabled we rely on it to do the nologin check */ |
1466 | if (!options.use_pam) | |
1467 | do_nologin(pw); | |
f7342052 | 1468 | do_setusercontext(pw); |
25bfd4ff | 1469 | /* |
1470 | * PAM session modules in do_setusercontext may have | |
1471 | * generated messages, so if this in an interactive | |
1472 | * login then display them too. | |
1473 | */ | |
d0c890ac | 1474 | if (!check_quietlogin(s, command)) |
25bfd4ff | 1475 | display_loginmsg(); |
f7342052 | 1476 | #endif /* HAVE_OSF_SIA */ |
1477 | } | |
1478 | ||
abdec250 | 1479 | #ifdef USE_PAM |
d9720710 | 1480 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1481 | debug3("PAM session not opened, exiting"); | |
abdec250 | 1482 | display_loginmsg(); |
1483 | exit(254); | |
1484 | } | |
1485 | #endif | |
1486 | ||
f7342052 | 1487 | /* |
1488 | * Get the shell from the password data. An empty shell field is | |
1489 | * legal, and means /bin/sh. | |
1490 | */ | |
1491 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
32214c88 | 1492 | |
1493 | /* | |
1494 | * Make sure $SHELL points to the shell from the password file, | |
1495 | * even if shell is overridden from login.conf | |
1496 | */ | |
1497 | env = do_setup_env(s, shell); | |
1498 | ||
f7342052 | 1499 | #ifdef HAVE_LOGIN_CAP |
1500 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1501 | #endif | |
1502 | ||
2e73a022 | 1503 | /* we have to stash the hostname before we close our socket. */ |
1504 | if (options.use_login) | |
46e3af7f | 1505 | hostname = get_remote_name_or_ip(utmp_len, |
c5a7d788 | 1506 | options.use_dns); |
7368a6c8 | 1507 | /* |
1508 | * Close the connection descriptors; note that this is the child, and | |
1509 | * the server will still have the socket open, and it is important | |
1510 | * that we do not shutdown it. Note that the descriptors cannot be | |
1511 | * closed before building the environment, as we call | |
1512 | * get_remote_ipaddr there. | |
1513 | */ | |
37656beb | 1514 | child_close_fds(); |
7368a6c8 | 1515 | |
7368a6c8 | 1516 | /* |
2a8a6488 | 1517 | * Must take new environment into use so that .ssh/rc, |
1518 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1519 | */ |
1520 | environ = env; | |
1521 | ||
bcfcc5f9 | 1522 | #if defined(KRB5) && defined(USE_AFS) |
a1e30b47 | 1523 | /* |
1524 | * At this point, we check to see if AFS is active and if we have | |
1525 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1526 | * if we can (and need to) extend the ticket into an AFS token. If | |
1527 | * we don't do this, we run into potential problems if the user's | |
1528 | * home directory is in AFS and it's not world-readable. | |
1529 | */ | |
1530 | ||
1531 | if (options.kerberos_get_afs_token && k_hasafs() && | |
4e2e5cfd | 1532 | (s->authctxt->krb5_ctx != NULL)) { |
a1e30b47 | 1533 | char cell[64]; |
1534 | ||
1535 | debug("Getting AFS token"); | |
1536 | ||
1537 | k_setpag(); | |
1538 | ||
1539 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1540 | krb5_afslog(s->authctxt->krb5_ctx, | |
1541 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1542 | ||
1543 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1544 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1545 | } | |
1546 | #endif | |
1547 | ||
7b9b0103 | 1548 | /* Change current directory to the user's home directory. */ |
dab89049 | 1549 | if (chdir(pw->pw_dir) < 0) { |
1550 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1551 | pw->pw_dir, strerror(errno)); | |
1552 | #ifdef HAVE_LOGIN_CAP | |
1553 | if (login_getcapbool(lc, "requirehome", 0)) | |
1554 | exit(1); | |
1555 | #endif | |
1556 | } | |
1557 | ||
f7342052 | 1558 | if (!options.use_login) |
1559 | do_rc_files(s, shell); | |
1d3c30db | 1560 | |
1561 | /* restore SIGPIPE for child */ | |
1562 | signal(SIGPIPE, SIG_DFL); | |
1563 | ||
f7342052 | 1564 | if (options.use_login) { |
1853d1ef | 1565 | launch_login(pw, hostname); |
1566 | /* NEVERREACHED */ | |
f7342052 | 1567 | } |
1568 | ||
1569 | /* Get the last component of the shell name. */ | |
1570 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1571 | shell0++; | |
1572 | else | |
1573 | shell0 = shell; | |
1574 | ||
7368a6c8 | 1575 | /* |
1576 | * If we have no command, execute the shell. In this case, the shell | |
1577 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1578 | * this is a login shell. | |
1579 | */ | |
1580 | if (!command) { | |
f7342052 | 1581 | char argv0[256]; |
7368a6c8 | 1582 | |
f7342052 | 1583 | /* Start the shell. Set initial character to '-'. */ |
1584 | argv0[0] = '-'; | |
7368a6c8 | 1585 | |
f7342052 | 1586 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1587 | >= sizeof(argv0) - 1) { | |
1588 | errno = EINVAL; | |
7368a6c8 | 1589 | perror(shell); |
1590 | exit(1); | |
f7342052 | 1591 | } |
7368a6c8 | 1592 | |
f7342052 | 1593 | /* Execute the shell. */ |
1594 | argv[0] = argv0; | |
1595 | argv[1] = NULL; | |
1596 | execve(shell, argv, env); | |
7368a6c8 | 1597 | |
f7342052 | 1598 | /* Executing the shell failed. */ |
1599 | perror(shell); | |
1600 | exit(1); | |
7368a6c8 | 1601 | } |
1602 | /* | |
1603 | * Execute the command using the user's shell. This uses the -c | |
1604 | * option to execute the command. | |
1605 | */ | |
f7342052 | 1606 | argv[0] = (char *) shell0; |
7368a6c8 | 1607 | argv[1] = "-c"; |
1608 | argv[2] = (char *) command; | |
1609 | argv[3] = NULL; | |
1610 | execve(shell, argv, env); | |
1611 | perror(shell); | |
1612 | exit(1); | |
1613 | } | |
1614 | ||
1615 | Session * | |
1616 | session_new(void) | |
1617 | { | |
1618 | int i; | |
1619 | static int did_init = 0; | |
1620 | if (!did_init) { | |
1621 | debug("session_new: init"); | |
184eed6a | 1622 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1623 | sessions[i].used = 0; |
7368a6c8 | 1624 | } |
1625 | did_init = 1; | |
1626 | } | |
184eed6a | 1627 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1628 | Session *s = &sessions[i]; |
1629 | if (! s->used) { | |
690d0d7f | 1630 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1631 | s->chanid = -1; |
1632 | s->ptyfd = -1; | |
1633 | s->ttyfd = -1; | |
7368a6c8 | 1634 | s->used = 1; |
86066315 | 1635 | s->self = i; |
d08341e6 | 1636 | s->x11_chanids = NULL; |
02323c45 | 1637 | debug("session_new: session %d", i); |
7368a6c8 | 1638 | return s; |
1639 | } | |
1640 | } | |
1641 | return NULL; | |
1642 | } | |
1643 | ||
396c147e | 1644 | static void |
7368a6c8 | 1645 | session_dump(void) |
1646 | { | |
1647 | int i; | |
184eed6a | 1648 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1649 | Session *s = &sessions[i]; |
c457707e | 1650 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1651 | s->used, |
1652 | s->self, | |
1653 | s, | |
1654 | s->chanid, | |
c457707e | 1655 | (long)s->pid); |
7368a6c8 | 1656 | } |
1657 | } | |
1658 | ||
e78a59f5 | 1659 | int |
57156994 | 1660 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1661 | { |
1662 | Session *s = session_new(); | |
1663 | debug("session_open: channel %d", chanid); | |
1664 | if (s == NULL) { | |
1665 | error("no more sessions"); | |
1666 | return 0; | |
1667 | } | |
57156994 | 1668 | s->authctxt = authctxt; |
1669 | s->pw = authctxt->pw; | |
fdaef11e | 1670 | if (s->pw == NULL || !authctxt->valid) |
0725ea77 | 1671 | fatal("no user for session %d", s->self); |
0b242b12 | 1672 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1673 | s->chanid = chanid; | |
e78a59f5 | 1674 | return 1; |
1675 | } | |
1676 | ||
1853d1ef | 1677 | Session * |
1678 | session_by_tty(char *tty) | |
1679 | { | |
1680 | int i; | |
1681 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1682 | Session *s = &sessions[i]; | |
1683 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1684 | debug("session_by_tty: session %d tty %s", i, tty); | |
1685 | return s; | |
1686 | } | |
1687 | } | |
1688 | debug("session_by_tty: unknown tty %.100s", tty); | |
1689 | session_dump(); | |
1690 | return NULL; | |
1691 | } | |
1692 | ||
396c147e | 1693 | static Session * |
e78a59f5 | 1694 | session_by_channel(int id) |
1695 | { | |
1696 | int i; | |
184eed6a | 1697 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1698 | Session *s = &sessions[i]; |
1699 | if (s->used && s->chanid == id) { | |
1700 | debug("session_by_channel: session %d channel %d", i, id); | |
1701 | return s; | |
1702 | } | |
1703 | } | |
1704 | debug("session_by_channel: unknown channel %d", id); | |
1705 | session_dump(); | |
1706 | return NULL; | |
1707 | } | |
1708 | ||
d08341e6 | 1709 | static Session * |
1710 | session_by_x11_channel(int id) | |
1711 | { | |
1712 | int i, j; | |
1713 | ||
1714 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1715 | Session *s = &sessions[i]; | |
1716 | ||
1717 | if (s->x11_chanids == NULL || !s->used) | |
1718 | continue; | |
1719 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
1720 | if (s->x11_chanids[j] == id) { | |
1721 | debug("session_by_x11_channel: session %d " | |
1722 | "channel %d", s->self, id); | |
1723 | return s; | |
1724 | } | |
1725 | } | |
1726 | } | |
1727 | debug("session_by_x11_channel: unknown channel %d", id); | |
1728 | session_dump(); | |
1729 | return NULL; | |
1730 | } | |
1731 | ||
396c147e | 1732 | static Session * |
e78a59f5 | 1733 | session_by_pid(pid_t pid) |
1734 | { | |
1735 | int i; | |
c457707e | 1736 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1737 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1738 | Session *s = &sessions[i]; |
1739 | if (s->used && s->pid == pid) | |
1740 | return s; | |
1741 | } | |
c457707e | 1742 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1743 | session_dump(); |
1744 | return NULL; | |
1745 | } | |
1746 | ||
396c147e | 1747 | static int |
e78a59f5 | 1748 | session_window_change_req(Session *s) |
1749 | { | |
1750 | s->col = packet_get_int(); | |
1751 | s->row = packet_get_int(); | |
1752 | s->xpixel = packet_get_int(); | |
1753 | s->ypixel = packet_get_int(); | |
95500969 | 1754 | packet_check_eom(); |
e78a59f5 | 1755 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1756 | return 1; | |
1757 | } | |
1758 | ||
396c147e | 1759 | static int |
e78a59f5 | 1760 | session_pty_req(Session *s) |
1761 | { | |
1e3b8b07 | 1762 | u_int len; |
30dcc918 | 1763 | int n_bytes; |
762715ce | 1764 | |
653d5f86 | 1765 | if (no_pty_flag) { |
1766 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1767 | return 0; |
653d5f86 | 1768 | } |
1769 | if (s->ttyfd != -1) { | |
1770 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1771 | return 0; |
653d5f86 | 1772 | } |
1773 | ||
e78a59f5 | 1774 | s->term = packet_get_string(&len); |
653d5f86 | 1775 | |
1776 | if (compat20) { | |
1777 | s->col = packet_get_int(); | |
1778 | s->row = packet_get_int(); | |
1779 | } else { | |
1780 | s->row = packet_get_int(); | |
1781 | s->col = packet_get_int(); | |
1782 | } | |
e78a59f5 | 1783 | s->xpixel = packet_get_int(); |
1784 | s->ypixel = packet_get_int(); | |
1785 | ||
1786 | if (strcmp(s->term, "") == 0) { | |
1787 | xfree(s->term); | |
1788 | s->term = NULL; | |
1789 | } | |
653d5f86 | 1790 | |
e78a59f5 | 1791 | /* Allocate a pty and open it. */ |
653d5f86 | 1792 | debug("Allocating pty."); |
1853d1ef | 1793 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1794 | if (s->term) |
1795 | xfree(s->term); | |
e78a59f5 | 1796 | s->term = NULL; |
1797 | s->ptyfd = -1; | |
1798 | s->ttyfd = -1; | |
1799 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1800 | return 0; |
e78a59f5 | 1801 | } |
1802 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1803 | |
1804 | /* for SSH1 the tty modes length is not given */ | |
1805 | if (!compat20) | |
1806 | n_bytes = packet_remaining(); | |
1807 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1808 | ||
1853d1ef | 1809 | if (!use_privsep) |
1810 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1811 | |
1812 | /* Set window size from the packet. */ | |
e78a59f5 | 1813 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1814 | ||
95500969 | 1815 | packet_check_eom(); |
1d1ffb87 | 1816 | session_proctitle(s); |
e78a59f5 | 1817 | return 1; |
1818 | } | |
1819 | ||
396c147e | 1820 | static int |
0b242b12 | 1821 | session_subsystem_req(Session *s) |
1822 | { | |
01855277 | 1823 | struct stat st; |
1e3b8b07 | 1824 | u_int len; |
0b242b12 | 1825 | int success = 0; |
01855277 | 1826 | char *cmd, *subsys = packet_get_string(&len); |
2ceb8101 | 1827 | u_int i; |
0b242b12 | 1828 | |
95500969 | 1829 | packet_check_eom(); |
bbe88b6d | 1830 | logit("subsystem request for %.100s", subsys); |
0b242b12 | 1831 | |
38c295d6 | 1832 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1833 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
1834 | cmd = options.subsystem_command[i]; | |
1835 | if (stat(cmd, &st) < 0) { | |
1836 | error("subsystem: cannot stat %s: %s", cmd, | |
1837 | strerror(errno)); | |
1838 | break; | |
1839 | } | |
1840 | debug("subsystem: exec() %s", cmd); | |
e5d7a405 | 1841 | s->is_subsystem = 1; |
01855277 | 1842 | do_exec(s, cmd); |
38c295d6 | 1843 | success = 1; |
24932ee9 | 1844 | break; |
38c295d6 | 1845 | } |
1846 | } | |
1847 | ||
1848 | if (!success) | |
bbe88b6d | 1849 | logit("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1850 | subsys); |
38c295d6 | 1851 | |
0b242b12 | 1852 | xfree(subsys); |
1853 | return success; | |
1854 | } | |
1855 | ||
396c147e | 1856 | static int |
0b242b12 | 1857 | session_x11_req(Session *s) |
1858 | { | |
8dcd9d5c | 1859 | int success; |
0b242b12 | 1860 | |
d08341e6 | 1861 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
1862 | error("session_x11_req: session %d: " | |
8918b906 | 1863 | "x11 forwarding already active", s->self); |
d08341e6 | 1864 | return 0; |
1865 | } | |
0b242b12 | 1866 | s->single_connection = packet_get_char(); |
1867 | s->auth_proto = packet_get_string(NULL); | |
1868 | s->auth_data = packet_get_string(NULL); | |
1869 | s->screen = packet_get_int(); | |
95500969 | 1870 | packet_check_eom(); |
0b242b12 | 1871 | |
8dcd9d5c | 1872 | success = session_setup_x11fwd(s); |
1873 | if (!success) { | |
0b242b12 | 1874 | xfree(s->auth_proto); |
1875 | xfree(s->auth_data); | |
1500bcdd | 1876 | s->auth_proto = NULL; |
1877 | s->auth_data = NULL; | |
0b242b12 | 1878 | } |
8dcd9d5c | 1879 | return success; |
0b242b12 | 1880 | } |
1881 | ||
396c147e | 1882 | static int |
38c295d6 | 1883 | session_shell_req(Session *s) |
1884 | { | |
95500969 | 1885 | packet_check_eom(); |
dac6753b | 1886 | do_exec(s, NULL); |
38c295d6 | 1887 | return 1; |
1888 | } | |
1889 | ||
396c147e | 1890 | static int |
38c295d6 | 1891 | session_exec_req(Session *s) |
1892 | { | |
1e3b8b07 | 1893 | u_int len; |
38c295d6 | 1894 | char *command = packet_get_string(&len); |
95500969 | 1895 | packet_check_eom(); |
dac6753b | 1896 | do_exec(s, command); |
c95add71 | 1897 | xfree(command); |
38c295d6 | 1898 | return 1; |
1899 | } | |
1900 | ||
16a79097 | 1901 | static int |
1902 | session_break_req(Session *s) | |
1903 | { | |
16a79097 | 1904 | |
f6be21a0 | 1905 | packet_get_int(); /* ignored */ |
16a79097 | 1906 | packet_check_eom(); |
1907 | ||
8168a86a | 1908 | if (s->ttyfd == -1 || |
1909 | tcsendbreak(s->ttyfd, 0) < 0) | |
16a79097 | 1910 | return 0; |
16a79097 | 1911 | return 1; |
1912 | } | |
1913 | ||
61a2c1da | 1914 | static int |
1915 | session_env_req(Session *s) | |
1916 | { | |
1917 | char *name, *val; | |
1918 | u_int name_len, val_len, i; | |
1919 | ||
1920 | name = packet_get_string(&name_len); | |
1921 | val = packet_get_string(&val_len); | |
1922 | packet_check_eom(); | |
1923 | ||
1924 | /* Don't set too many environment variables */ | |
1925 | if (s->num_env > 128) { | |
1926 | debug2("Ignoring env request %s: too many env vars", name); | |
1927 | goto fail; | |
1928 | } | |
1929 | ||
1930 | for (i = 0; i < options.num_accept_env; i++) { | |
1931 | if (match_pattern(name, options.accept_env[i])) { | |
1932 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
1933 | s->env = xrealloc(s->env, sizeof(*s->env) * | |
1934 | (s->num_env + 1)); | |
1935 | s->env[s->num_env].name = name; | |
1936 | s->env[s->num_env].val = val; | |
1937 | s->num_env++; | |
1938 | return (1); | |
1939 | } | |
1940 | } | |
1941 | debug2("Ignoring env request %s: disallowed name", name); | |
1942 | ||
1943 | fail: | |
1944 | xfree(name); | |
1945 | xfree(val); | |
1946 | return (0); | |
1947 | } | |
1948 | ||
396c147e | 1949 | static int |
fa08c86b | 1950 | session_auth_agent_req(Session *s) |
1951 | { | |
1952 | static int called = 0; | |
95500969 | 1953 | packet_check_eom(); |
d343d900 | 1954 | if (no_agent_forwarding_flag) { |
1955 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1956 | return 0; | |
1957 | } | |
fa08c86b | 1958 | if (called) { |
1959 | return 0; | |
1960 | } else { | |
1961 | called = 1; | |
1962 | return auth_input_request_forwarding(s->pw); | |
1963 | } | |
1964 | } | |
1965 | ||
7899c98f | 1966 | int |
1967 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 1968 | { |
e78a59f5 | 1969 | int success = 0; |
e78a59f5 | 1970 | Session *s; |
e78a59f5 | 1971 | |
7899c98f | 1972 | if ((s = session_by_channel(c->self)) == NULL) { |
bbe88b6d | 1973 | logit("session_input_channel_req: no session %d req %.100s", |
7899c98f | 1974 | c->self, rtype); |
1975 | return 0; | |
1976 | } | |
1977 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 1978 | |
1979 | /* | |
e5d7a405 | 1980 | * a session is in LARVAL state until a shell, a command |
1981 | * or a subsystem is executed | |
e78a59f5 | 1982 | */ |
1983 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1984 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1985 | success = session_shell_req(s); |
e78a59f5 | 1986 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1987 | success = session_exec_req(s); |
e78a59f5 | 1988 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1989 | success = session_pty_req(s); |
0b242b12 | 1990 | } else if (strcmp(rtype, "x11-req") == 0) { |
1991 | success = session_x11_req(s); | |
fa08c86b | 1992 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1993 | success = session_auth_agent_req(s); | |
0b242b12 | 1994 | } else if (strcmp(rtype, "subsystem") == 0) { |
1995 | success = session_subsystem_req(s); | |
61a2c1da | 1996 | } else if (strcmp(rtype, "env") == 0) { |
1997 | success = session_env_req(s); | |
e78a59f5 | 1998 | } |
1999 | } | |
2000 | if (strcmp(rtype, "window-change") == 0) { | |
2001 | success = session_window_change_req(s); | |
c6c76c99 | 2002 | } else if (strcmp(rtype, "break") == 0) { |
2003 | success = session_break_req(s); | |
e78a59f5 | 2004 | } |
c6c76c99 | 2005 | |
7899c98f | 2006 | return success; |
e78a59f5 | 2007 | } |
2008 | ||
2009 | void | |
2010 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2011 | { | |
2012 | if (!compat20) | |
2013 | fatal("session_set_fds: called for proto != 2.0"); | |
2014 | /* | |
2015 | * now that have a child and a pipe to the child, | |
2016 | * we can activate our channel and register the fd's | |
2017 | */ | |
2018 | if (s->chanid == -1) | |
2019 | fatal("no channel for session %d", s->self); | |
2020 | channel_set_fds(s->chanid, | |
2021 | fdout, fdin, fderr, | |
a22aff1f | 2022 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 2023 | 1, |
2024 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 2025 | } |
2026 | ||
86066315 | 2027 | /* |
2028 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2029 | * (e.g., due to a dropped connection). | |
2030 | */ | |
1853d1ef | 2031 | void |
2362db19 | 2032 | session_pty_cleanup2(Session *s) |
7368a6c8 | 2033 | { |
86066315 | 2034 | if (s == NULL) { |
2035 | error("session_pty_cleanup: no session"); | |
2036 | return; | |
2037 | } | |
2038 | if (s->ttyfd == -1) | |
7368a6c8 | 2039 | return; |
2040 | ||
0725ea77 | 2041 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 2042 | |
7368a6c8 | 2043 | /* Record that the user has logged out. */ |
86066315 | 2044 | if (s->pid != 0) |
f3837bc6 | 2045 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 2046 | |
2047 | /* Release the pseudo-tty. */ | |
1853d1ef | 2048 | if (getuid() == 0) |
2049 | pty_release(s->tty); | |
7368a6c8 | 2050 | |
2051 | /* | |
2052 | * Close the server side of the socket pairs. We must do this after | |
2053 | * the pty cleanup, so that another process doesn't get this pty | |
2054 | * while we're still cleaning up. | |
2055 | */ | |
2056 | if (close(s->ptymaster) < 0) | |
1853d1ef | 2057 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 2058 | |
2059 | /* unlink pty from session */ | |
2060 | s->ttyfd = -1; | |
7368a6c8 | 2061 | } |
e78a59f5 | 2062 | |
1853d1ef | 2063 | void |
2362db19 | 2064 | session_pty_cleanup(Session *s) |
1853d1ef | 2065 | { |
2362db19 | 2066 | PRIVSEP(session_pty_cleanup2(s)); |
1853d1ef | 2067 | } |
2068 | ||
6c723e7c | 2069 | static char * |
2070 | sig2name(int sig) | |
2071 | { | |
2072 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2073 | SSH_SIG(ABRT); | |
2074 | SSH_SIG(ALRM); | |
2075 | SSH_SIG(FPE); | |
2076 | SSH_SIG(HUP); | |
2077 | SSH_SIG(ILL); | |
2078 | SSH_SIG(INT); | |
2079 | SSH_SIG(KILL); | |
2080 | SSH_SIG(PIPE); | |
2081 | SSH_SIG(QUIT); | |
2082 | SSH_SIG(SEGV); | |
2083 | SSH_SIG(TERM); | |
2084 | SSH_SIG(USR1); | |
2085 | SSH_SIG(USR2); | |
2086 | #undef SSH_SIG | |
2087 | return "SIG@openssh.com"; | |
2088 | } | |
2089 | ||
d08341e6 | 2090 | static void |
2091 | session_close_x11(int id) | |
2092 | { | |
2093 | Channel *c; | |
2094 | ||
b872f7f0 | 2095 | if ((c = channel_by_id(id)) == NULL) { |
d08341e6 | 2096 | debug("session_close_x11: x11 channel %d missing", id); |
2097 | } else { | |
2098 | /* Detach X11 listener */ | |
2099 | debug("session_close_x11: detach x11 channel %d", id); | |
2100 | channel_cancel_cleanup(id); | |
2101 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2102 | chan_mark_dead(c); | |
2103 | } | |
2104 | } | |
2105 | ||
2106 | static void | |
2107 | session_close_single_x11(int id, void *arg) | |
2108 | { | |
2109 | Session *s; | |
2110 | u_int i; | |
2111 | ||
2112 | debug3("session_close_single_x11: channel %d", id); | |
2113 | channel_cancel_cleanup(id); | |
2114 | if ((s = session_by_x11_channel(id)) == NULL) | |
2115 | fatal("session_close_single_x11: no x11 channel %d", id); | |
2116 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2117 | debug("session_close_single_x11: session %d: " | |
2118 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2119 | /* | |
2120 | * The channel "id" is already closing, but make sure we | |
2121 | * close all of its siblings. | |
2122 | */ | |
2123 | if (s->x11_chanids[i] != id) | |
2124 | session_close_x11(s->x11_chanids[i]); | |
2125 | } | |
2126 | xfree(s->x11_chanids); | |
2127 | s->x11_chanids = NULL; | |
2128 | if (s->display) { | |
2129 | xfree(s->display); | |
2130 | s->display = NULL; | |
2131 | } | |
2132 | if (s->auth_proto) { | |
2133 | xfree(s->auth_proto); | |
2134 | s->auth_proto = NULL; | |
2135 | } | |
2136 | if (s->auth_data) { | |
2137 | xfree(s->auth_data); | |
2138 | s->auth_data = NULL; | |
2139 | } | |
2140 | if (s->auth_display) { | |
2141 | xfree(s->auth_display); | |
2142 | s->auth_display = NULL; | |
2143 | } | |
2144 | } | |
2145 | ||
396c147e | 2146 | static void |
e78a59f5 | 2147 | session_exit_message(Session *s, int status) |
2148 | { | |
2149 | Channel *c; | |
5a4ae906 | 2150 | |
2151 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 2152 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 2153 | s->self, s->chanid); |
c457707e | 2154 | debug("session_exit_message: session %d channel %d pid %ld", |
2155 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 2156 | |
2157 | if (WIFEXITED(status)) { | |
5a4ae906 | 2158 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 2159 | packet_put_int(WEXITSTATUS(status)); |
2160 | packet_send(); | |
2161 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 2162 | channel_request_start(s->chanid, "exit-signal", 0); |
6c723e7c | 2163 | packet_put_cstring(sig2name(WTERMSIG(status))); |
a64009ad | 2164 | #ifdef WCOREDUMP |
e78a59f5 | 2165 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 2166 | #else /* WCOREDUMP */ |
2167 | packet_put_char(0); | |
2168 | #endif /* WCOREDUMP */ | |
e78a59f5 | 2169 | packet_put_cstring(""); |
2170 | packet_put_cstring(""); | |
2171 | packet_send(); | |
2172 | } else { | |
2173 | /* Some weird exit cause. Just exit. */ | |
2174 | packet_disconnect("wait returned status %04x.", status); | |
2175 | } | |
2176 | ||
2177 | /* disconnect channel */ | |
2178 | debug("session_exit_message: release channel %d", s->chanid); | |
8cd0437d | 2179 | s->pid = 0; |
2180 | ||
2181 | /* | |
2182 | * Adjust cleanup callback attachment to send close messages when | |
2183 | * the channel gets EOF. The session will be then be closed | |
2184 | * by session_close_by_channel when the childs close their fds. | |
2185 | */ | |
2186 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2187 | ||
9da5c3c9 | 2188 | /* |
2189 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2190 | * interested in data we write. | |
2191 | * Note that we must not call 'chan_read_failed', since there could | |
2192 | * be some more data waiting in the pipe. | |
2193 | */ | |
0b242b12 | 2194 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
2195 | chan_write_failed(c); | |
e78a59f5 | 2196 | } |
2197 | ||
1853d1ef | 2198 | void |
86066315 | 2199 | session_close(Session *s) |
e78a59f5 | 2200 | { |
2ceb8101 | 2201 | u_int i; |
61a2c1da | 2202 | |
c457707e | 2203 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
2362db19 | 2204 | if (s->ttyfd != -1) |
86066315 | 2205 | session_pty_cleanup(s); |
e78a59f5 | 2206 | if (s->term) |
2207 | xfree(s->term); | |
2208 | if (s->display) | |
2209 | xfree(s->display); | |
d08341e6 | 2210 | if (s->x11_chanids) |
2211 | xfree(s->x11_chanids); | |
f9314d9a | 2212 | if (s->auth_display) |
2213 | xfree(s->auth_display); | |
e78a59f5 | 2214 | if (s->auth_data) |
2215 | xfree(s->auth_data); | |
2216 | if (s->auth_proto) | |
2217 | xfree(s->auth_proto); | |
2218 | s->used = 0; | |
61a2c1da | 2219 | for (i = 0; i < s->num_env; i++) { |
2220 | xfree(s->env[i].name); | |
2221 | xfree(s->env[i].val); | |
2222 | } | |
2223 | if (s->env != NULL) | |
2224 | xfree(s->env); | |
1d1ffb87 | 2225 | session_proctitle(s); |
e78a59f5 | 2226 | } |
2227 | ||
2228 | void | |
2229 | session_close_by_pid(pid_t pid, int status) | |
2230 | { | |
2231 | Session *s = session_by_pid(pid); | |
2232 | if (s == NULL) { | |
c457707e | 2233 | debug("session_close_by_pid: no session for pid %ld", |
2234 | (long)pid); | |
e78a59f5 | 2235 | return; |
2236 | } | |
2237 | if (s->chanid != -1) | |
2238 | session_exit_message(s, status); | |
8cd0437d | 2239 | if (s->ttyfd != -1) |
2240 | session_pty_cleanup(s); | |
e78a59f5 | 2241 | } |
2242 | ||
2243 | /* | |
2244 | * this is called when a channel dies before | |
2245 | * the session 'child' itself dies | |
2246 | */ | |
2247 | void | |
2248 | session_close_by_channel(int id, void *arg) | |
2249 | { | |
2250 | Session *s = session_by_channel(id); | |
8cd0437d | 2251 | u_int i; |
d08341e6 | 2252 | |
e78a59f5 | 2253 | if (s == NULL) { |
418e724c | 2254 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 2255 | return; |
2256 | } | |
c457707e | 2257 | debug("session_close_by_channel: channel %d child %ld", |
2258 | id, (long)s->pid); | |
d5f24f94 | 2259 | if (s->pid != 0) { |
418e724c | 2260 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 2261 | /* |
2262 | * delay detach of session, but release pty, since | |
2263 | * the fd's to the child are already closed | |
2264 | */ | |
2362db19 | 2265 | if (s->ttyfd != -1) |
efcc9957 | 2266 | session_pty_cleanup(s); |
418e724c | 2267 | return; |
e78a59f5 | 2268 | } |
418e724c | 2269 | /* detach by removing callback */ |
2270 | channel_cancel_cleanup(s->chanid); | |
8cd0437d | 2271 | |
2272 | /* Close any X11 listeners associated with this session */ | |
2273 | if (s->x11_chanids != NULL) { | |
2274 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2275 | session_close_x11(s->x11_chanids[i]); | |
2276 | s->x11_chanids[i] = -1; | |
2277 | } | |
2278 | } | |
2279 | ||
418e724c | 2280 | s->chanid = -1; |
d5f24f94 | 2281 | session_close(s); |
2282 | } | |
2283 | ||
2284 | void | |
1853d1ef | 2285 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 2286 | { |
2287 | int i; | |
184eed6a | 2288 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 2289 | Session *s = &sessions[i]; |
1853d1ef | 2290 | if (s->used) { |
2291 | if (closefunc != NULL) | |
2292 | closefunc(s); | |
2293 | else | |
2294 | session_close(s); | |
2295 | } | |
d5f24f94 | 2296 | } |
e78a59f5 | 2297 | } |
2298 | ||
396c147e | 2299 | static char * |
1d1ffb87 | 2300 | session_tty_list(void) |
2301 | { | |
2302 | static char buf[1024]; | |
2303 | int i; | |
d0104542 | 2304 | char *cp; |
2305 | ||
1d1ffb87 | 2306 | buf[0] = '\0'; |
184eed6a | 2307 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 2308 | Session *s = &sessions[i]; |
2309 | if (s->used && s->ttyfd != -1) { | |
b6453d99 | 2310 | |
d0104542 | 2311 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2312 | cp = strrchr(s->tty, '/'); | |
2313 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2314 | } else | |
2315 | cp = s->tty + 5; | |
b6453d99 | 2316 | |
1d1ffb87 | 2317 | if (buf[0] != '\0') |
2318 | strlcat(buf, ",", sizeof buf); | |
d0104542 | 2319 | strlcat(buf, cp, sizeof buf); |
1d1ffb87 | 2320 | } |
2321 | } | |
2322 | if (buf[0] == '\0') | |
2323 | strlcpy(buf, "notty", sizeof buf); | |
2324 | return buf; | |
2325 | } | |
2326 | ||
2327 | void | |
2328 | session_proctitle(Session *s) | |
2329 | { | |
2330 | if (s->pw == NULL) | |
2331 | error("no user for session %d", s->self); | |
2332 | else | |
2333 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2334 | } | |
2335 | ||
8dcd9d5c | 2336 | int |
2337 | session_setup_x11fwd(Session *s) | |
2338 | { | |
8dcd9d5c | 2339 | struct stat st; |
c9d0ad9b | 2340 | char display[512], auth_display[512]; |
2341 | char hostname[MAXHOSTNAMELEN]; | |
d08341e6 | 2342 | u_int i; |
8dcd9d5c | 2343 | |
2344 | if (no_x11_forwarding_flag) { | |
2345 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2346 | return 0; | |
2347 | } | |
2348 | if (!options.x11_forwarding) { | |
2349 | debug("X11 forwarding disabled in server configuration file."); | |
2350 | return 0; | |
2351 | } | |
2352 | if (!options.xauth_location || | |
2353 | (stat(options.xauth_location, &st) == -1)) { | |
2354 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2355 | return 0; | |
2356 | } | |
ff027d84 | 2357 | if (options.use_login) { |
2358 | packet_send_debug("X11 forwarding disabled; " | |
2359 | "not compatible with UseLogin=yes."); | |
2360 | return 0; | |
2361 | } | |
b44de2b1 | 2362 | if (s->display != NULL) { |
8dcd9d5c | 2363 | debug("X11 display already set."); |
2364 | return 0; | |
2365 | } | |
57f228e8 | 2366 | if (x11_create_display_inet(options.x11_display_offset, |
2367 | options.x11_use_localhost, s->single_connection, | |
d08341e6 | 2368 | &s->display_number, &s->x11_chanids) == -1) { |
b44de2b1 | 2369 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 2370 | return 0; |
2371 | } | |
d08341e6 | 2372 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2373 | channel_register_cleanup(s->x11_chanids[i], | |
8cd0437d | 2374 | session_close_single_x11, 0); |
d08341e6 | 2375 | } |
c9d0ad9b | 2376 | |
2377 | /* Set up a suitable value for the DISPLAY variable. */ | |
2378 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2379 | fatal("gethostname: %.100s", strerror(errno)); | |
2380 | /* | |
2381 | * auth_display must be used as the displayname when the | |
2382 | * authorization entry is added with xauth(1). This will be | |
2383 | * different than the DISPLAY string for localhost displays. | |
2384 | */ | |
e6e573bd | 2385 | if (options.x11_use_localhost) { |
57f228e8 | 2386 | snprintf(display, sizeof display, "localhost:%u.%u", |
c9d0ad9b | 2387 | s->display_number, s->screen); |
57f228e8 | 2388 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
f9314d9a | 2389 | s->display_number, s->screen); |
c9d0ad9b | 2390 | s->display = xstrdup(display); |
f9314d9a | 2391 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 2392 | } else { |
2393 | #ifdef IPADDR_IN_DISPLAY | |
2394 | struct hostent *he; | |
2395 | struct in_addr my_addr; | |
2396 | ||
2397 | he = gethostbyname(hostname); | |
2398 | if (he == NULL) { | |
2399 | error("Can't get IP address for X11 DISPLAY."); | |
2400 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2401 | return 0; | |
2402 | } | |
2403 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
57f228e8 | 2404 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
c9d0ad9b | 2405 | s->display_number, s->screen); |
2406 | #else | |
57f228e8 | 2407 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
c9d0ad9b | 2408 | s->display_number, s->screen); |
2409 | #endif | |
2410 | s->display = xstrdup(display); | |
f9314d9a | 2411 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2412 | } |
2413 | ||
8dcd9d5c | 2414 | return 1; |
2415 | } | |
2416 | ||
396c147e | 2417 | static void |
59c97189 | 2418 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2419 | { |
57156994 | 2420 | server_loop2(authctxt); |
2362db19 | 2421 | } |
2422 | ||
2423 | void | |
2424 | do_cleanup(Authctxt *authctxt) | |
2425 | { | |
2426 | static int called = 0; | |
2427 | ||
2428 | debug("do_cleanup"); | |
2429 | ||
2430 | /* no cleanup if we're in the child for login shell */ | |
2431 | if (is_child) | |
2432 | return; | |
2433 | ||
2434 | /* avoid double cleanup */ | |
2435 | if (called) | |
2436 | return; | |
2437 | called = 1; | |
2438 | ||
2439 | if (authctxt == NULL) | |
2440 | return; | |
2441 | #ifdef KRB5 | |
2442 | if (options.kerberos_ticket_cleanup && | |
2443 | authctxt->krb5_ctx) | |
2444 | krb5_cleanup_proc(authctxt); | |
7364bd04 | 2445 | #endif |
2362db19 | 2446 | |
2447 | #ifdef GSSAPI | |
2448 | if (compat20 && options.gss_cleanup_creds) | |
2449 | ssh_gssapi_cleanup_creds(); | |
2450 | #endif | |
2451 | ||
c6630044 | 2452 | #ifdef USE_PAM |
2453 | if (options.use_pam) { | |
2454 | sshpam_cleanup(); | |
2455 | sshpam_thread_cleanup(); | |
2456 | } | |
2457 | #endif | |
2458 | ||
2362db19 | 2459 | /* remove agent socket */ |
2460 | auth_sock_cleanup_proc(authctxt->pw); | |
2461 | ||
2462 | /* | |
2463 | * Cleanup ptys/utmp only if privsep is disabled, | |
2464 | * or if running in monitor. | |
2465 | */ | |
2466 | if (!use_privsep || mm_is_monitor()) | |
2467 | session_destroy_all(session_pty_cleanup2); | |
e78a59f5 | 2468 | } |