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00146caa | 1 | /* $OpenBSD: session.c,v 1.212 2006/07/22 20:48:23 stevesk Exp $ */ |
7368a6c8 | 2 | /* |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
bcbf86ec | 5 | * |
6 | * As far as I am concerned, the code I have written for this software | |
7 | * can be used freely for any purpose. Any derived versions of this | |
8 | * software must be clearly marked as such, and if the derived work is | |
9 | * incompatible with the protocol description in the RFC file, it must be | |
10 | * called by a name other than "ssh" or "Secure Shell". | |
11 | * | |
e78a59f5 | 12 | * SSH2 support by Markus Friedl. |
a96070d4 | 13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 14 | * |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * 1. Redistributions of source code must retain the above copyright | |
19 | * notice, this list of conditions and the following disclaimer. | |
20 | * 2. Redistributions in binary form must reproduce the above copyright | |
21 | * notice, this list of conditions and the following disclaimer in the | |
22 | * documentation and/or other materials provided with the distribution. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
e78a59f5 | 34 | */ |
7368a6c8 | 35 | |
36 | #include "includes.h" | |
aa2eae64 | 37 | |
38 | #include <sys/types.h> | |
4095f623 | 39 | #ifdef HAVE_SYS_STAT_H |
40 | # include <sys/stat.h> | |
41 | #endif | |
5b04a8bf | 42 | #include <sys/socket.h> |
aa2eae64 | 43 | #include <sys/wait.h> |
cebb4c24 | 44 | #include <sys/un.h> |
a75f5360 | 45 | |
67514848 | 46 | #include <arpa/inet.h> |
47 | ||
028094f4 | 48 | #include <errno.h> |
16fbe330 | 49 | #include <grp.h> |
b5b88c19 | 50 | #ifdef HAVE_PATHS_H |
a75f5360 | 51 | #include <paths.h> |
b5b88c19 | 52 | #endif |
b1842393 | 53 | #include <pwd.h> |
ada68823 | 54 | #include <signal.h> |
00146caa | 55 | #include <string.h> |
67514848 | 56 | #include <unistd.h> |
7368a6c8 | 57 | |
7368a6c8 | 58 | #include "ssh.h" |
42f11eb2 | 59 | #include "ssh1.h" |
60 | #include "ssh2.h" | |
61 | #include "xmalloc.h" | |
1729c161 | 62 | #include "sshpty.h" |
7368a6c8 | 63 | #include "packet.h" |
64 | #include "buffer.h" | |
61a2c1da | 65 | #include "match.h" |
7368a6c8 | 66 | #include "uidswap.h" |
67 | #include "compat.h" | |
a5efa1bb | 68 | #include "channels.h" |
e78a59f5 | 69 | #include "bufaux.h" |
e78a59f5 | 70 | #include "auth.h" |
38c295d6 | 71 | #include "auth-options.h" |
42f11eb2 | 72 | #include "pathnames.h" |
73 | #include "log.h" | |
74 | #include "servconf.h" | |
1729c161 | 75 | #include "sshlogin.h" |
42f11eb2 | 76 | #include "serverloop.h" |
77 | #include "canohost.h" | |
5ca51e19 | 78 | #include "session.h" |
07200973 | 79 | #include "kex.h" |
1853d1ef | 80 | #include "monitor_wrap.h" |
e78a59f5 | 81 | |
bcfcc5f9 | 82 | #if defined(KRB5) && defined(USE_AFS) |
39dfceeb | 83 | #include <kafs.h> |
84 | #endif | |
85 | ||
7364bd04 | 86 | #ifdef GSSAPI |
87 | #include "ssh-gss.h" | |
88 | #endif | |
89 | ||
7368a6c8 | 90 | /* func */ |
91 | ||
92 | Session *session_new(void); | |
9c328529 | 93 | void session_set_fds(Session *, int, int, int); |
2362db19 | 94 | void session_pty_cleanup(Session *); |
9c328529 | 95 | void session_proctitle(Session *); |
96 | int session_setup_x11fwd(Session *); | |
97 | void do_exec_pty(Session *, const char *); | |
98 | void do_exec_no_pty(Session *, const char *); | |
99 | void do_exec(Session *, const char *); | |
100 | void do_login(Session *, const char *); | |
8a9ac95d | 101 | #ifdef LOGIN_NEEDS_UTMPX |
102 | static void do_pre_login(Session *s); | |
103 | #endif | |
9c328529 | 104 | void do_child(Session *, const char *); |
f2c2fd71 | 105 | void do_motd(void); |
9c328529 | 106 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 107 | |
396c147e | 108 | static void do_authenticated1(Authctxt *); |
109 | static void do_authenticated2(Authctxt *); | |
9c328529 | 110 | |
396c147e | 111 | static int session_pty_req(Session *); |
bb5639fe | 112 | |
7368a6c8 | 113 | /* import */ |
114 | extern ServerOptions options; | |
115 | extern char *__progname; | |
116 | extern int log_stderr; | |
117 | extern int debug_flag; | |
1e3b8b07 | 118 | extern u_int utmp_len; |
089fbbd2 | 119 | extern int startup_pipe; |
e78e738a | 120 | extern void destroy_sensitive_data(void); |
bc7dfc06 | 121 | extern Buffer loginmsg; |
089fbbd2 | 122 | |
b5e300c2 | 123 | /* original command from peer. */ |
c95add71 | 124 | const char *original_command = NULL; |
b5e300c2 | 125 | |
7368a6c8 | 126 | /* data */ |
127 | #define MAX_SESSIONS 10 | |
128 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 129 | |
2e73a022 | 130 | #ifdef HAVE_LOGIN_CAP |
1836f69f | 131 | login_cap_t *lc; |
2e73a022 | 132 | #endif |
133 | ||
2362db19 | 134 | static int is_child = 0; |
135 | ||
149cdb60 | 136 | /* Name and directory of socket for authentication agent forwarding. */ |
137 | static char *auth_sock_name = NULL; | |
138 | static char *auth_sock_dir = NULL; | |
139 | ||
140 | /* removes the agent forwarding socket */ | |
141 | ||
142 | static void | |
2362db19 | 143 | auth_sock_cleanup_proc(struct passwd *pw) |
149cdb60 | 144 | { |
149cdb60 | 145 | if (auth_sock_name != NULL) { |
146 | temporarily_use_uid(pw); | |
147 | unlink(auth_sock_name); | |
148 | rmdir(auth_sock_dir); | |
149 | auth_sock_name = NULL; | |
150 | restore_uid(); | |
151 | } | |
152 | } | |
153 | ||
154 | static int | |
155 | auth_input_request_forwarding(struct passwd * pw) | |
156 | { | |
157 | Channel *nc; | |
158 | int sock; | |
159 | struct sockaddr_un sunaddr; | |
160 | ||
161 | if (auth_sock_name != NULL) { | |
162 | error("authentication forwarding requested twice."); | |
163 | return 0; | |
164 | } | |
165 | ||
166 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
167 | temporarily_use_uid(pw); | |
168 | ||
169 | /* Allocate a buffer for the socket name, and format the name. */ | |
170 | auth_sock_name = xmalloc(MAXPATHLEN); | |
171 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
c88de854 | 172 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
149cdb60 | 173 | |
174 | /* Create private directory for socket */ | |
175 | if (mkdtemp(auth_sock_dir) == NULL) { | |
176 | packet_send_debug("Agent forwarding disabled: " | |
177 | "mkdtemp() failed: %.100s", strerror(errno)); | |
178 | restore_uid(); | |
179 | xfree(auth_sock_name); | |
180 | xfree(auth_sock_dir); | |
181 | auth_sock_name = NULL; | |
182 | auth_sock_dir = NULL; | |
183 | return 0; | |
184 | } | |
c457707e | 185 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
186 | auth_sock_dir, (long) getpid()); | |
149cdb60 | 187 | |
149cdb60 | 188 | /* Create the socket. */ |
189 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
190 | if (sock < 0) | |
191 | packet_disconnect("socket: %.100s", strerror(errno)); | |
192 | ||
193 | /* Bind it to the name. */ | |
194 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
195 | sunaddr.sun_family = AF_UNIX; | |
196 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
197 | ||
32596c7b | 198 | if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) |
149cdb60 | 199 | packet_disconnect("bind: %.100s", strerror(errno)); |
200 | ||
201 | /* Restore the privileged uid. */ | |
202 | restore_uid(); | |
203 | ||
204 | /* Start listening on the socket. */ | |
fce39749 | 205 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
149cdb60 | 206 | packet_disconnect("listen: %.100s", strerror(errno)); |
207 | ||
208 | /* Allocate a channel for the authentication agent socket. */ | |
209 | nc = channel_new("auth socket", | |
210 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
211 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 212 | 0, "auth socket", 1); |
149cdb60 | 213 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
214 | return 1; | |
215 | } | |
216 | ||
dd1fb864 | 217 | static void |
218 | display_loginmsg(void) | |
219 | { | |
56964485 | 220 | if (buffer_len(&loginmsg) > 0) { |
221 | buffer_append(&loginmsg, "\0", 1); | |
222 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
223 | buffer_clear(&loginmsg); | |
224 | } | |
dd1fb864 | 225 | } |
149cdb60 | 226 | |
bb5639fe | 227 | void |
228 | do_authenticated(Authctxt *authctxt) | |
229 | { | |
381b021b | 230 | setproctitle("%s", authctxt->pw->pw_name); |
231 | ||
bb5639fe | 232 | /* setup the channel layer */ |
233 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
234 | channel_permit_all_opens(); | |
235 | ||
236 | if (compat20) | |
237 | do_authenticated2(authctxt); | |
238 | else | |
239 | do_authenticated1(authctxt); | |
e4f7282d | 240 | |
2362db19 | 241 | do_cleanup(authctxt); |
bb5639fe | 242 | } |
243 | ||
7368a6c8 | 244 | /* |
245 | * Prepares for an interactive session. This is called after the user has | |
246 | * been successfully authenticated. During this message exchange, pseudo | |
247 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
248 | * are requested, etc. | |
249 | */ | |
396c147e | 250 | static void |
bb5639fe | 251 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 252 | { |
253 | Session *s; | |
7368a6c8 | 254 | char *command; |
54a5250f | 255 | int success, type, screen_flag; |
7138ebd9 | 256 | int enable_compression_after_reply = 0; |
257 | u_int proto_len, data_len, dlen, compression_level = 0; | |
7368a6c8 | 258 | |
259 | s = session_new(); | |
b0042027 | 260 | if (s == NULL) { |
261 | error("no more sessions"); | |
262 | return; | |
263 | } | |
ced49be2 | 264 | s->authctxt = authctxt; |
bb5639fe | 265 | s->pw = authctxt->pw; |
2e73a022 | 266 | |
7368a6c8 | 267 | /* |
268 | * We stay in this loop until the client requests to execute a shell | |
269 | * or a command. | |
270 | */ | |
271 | for (;;) { | |
bb5639fe | 272 | success = 0; |
7368a6c8 | 273 | |
274 | /* Get a packet from the client. */ | |
54a5250f | 275 | type = packet_read(); |
7368a6c8 | 276 | |
277 | /* Process the packet. */ | |
278 | switch (type) { | |
279 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 280 | compression_level = packet_get_int(); |
95500969 | 281 | packet_check_eom(); |
7368a6c8 | 282 | if (compression_level < 1 || compression_level > 9) { |
d77347cc | 283 | packet_send_debug("Received invalid compression level %d.", |
184eed6a | 284 | compression_level); |
7368a6c8 | 285 | break; |
286 | } | |
07200973 | 287 | if (options.compression == COMP_NONE) { |
636f76ca | 288 | debug2("compression disabled"); |
289 | break; | |
290 | } | |
7368a6c8 | 291 | /* Enable compression after we have responded with SUCCESS. */ |
292 | enable_compression_after_reply = 1; | |
293 | success = 1; | |
294 | break; | |
295 | ||
296 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 297 | success = session_pty_req(s); |
7368a6c8 | 298 | break; |
299 | ||
300 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 301 | s->auth_proto = packet_get_string(&proto_len); |
302 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 303 | |
2af09193 | 304 | screen_flag = packet_get_protocol_flags() & |
305 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
306 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
307 | ||
308 | if (packet_remaining() == 4) { | |
309 | if (!screen_flag) | |
310 | debug2("Buggy client: " | |
311 | "X11 screen flag missing"); | |
7368a6c8 | 312 | s->screen = packet_get_int(); |
c8b058b4 | 313 | } else { |
7368a6c8 | 314 | s->screen = 0; |
c8b058b4 | 315 | } |
95500969 | 316 | packet_check_eom(); |
8dcd9d5c | 317 | success = session_setup_x11fwd(s); |
318 | if (!success) { | |
319 | xfree(s->auth_proto); | |
320 | xfree(s->auth_data); | |
1500bcdd | 321 | s->auth_proto = NULL; |
322 | s->auth_data = NULL; | |
7368a6c8 | 323 | } |
7368a6c8 | 324 | break; |
7368a6c8 | 325 | |
326 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
327 | if (no_agent_forwarding_flag || compat13) { | |
328 | debug("Authentication agent forwarding not permitted for this authentication."); | |
329 | break; | |
330 | } | |
331 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 332 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 333 | break; |
334 | ||
335 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
336 | if (no_port_forwarding_flag) { | |
337 | debug("Port forwarding not permitted for this authentication."); | |
338 | break; | |
339 | } | |
33de75a3 | 340 | if (!options.allow_tcp_forwarding) { |
341 | debug("Port forwarding not permitted."); | |
342 | break; | |
343 | } | |
7368a6c8 | 344 | debug("Received TCP/IP port forwarding request."); |
42ea6f5e | 345 | if (channel_input_port_forward_request(s->pw->pw_uid == 0, |
346 | options.gateway_ports) < 0) { | |
347 | debug("Port forwarding failed."); | |
348 | break; | |
349 | } | |
7368a6c8 | 350 | success = 1; |
351 | break; | |
352 | ||
353 | case SSH_CMSG_MAX_PACKET_SIZE: | |
354 | if (packet_set_maxsize(packet_get_int()) > 0) | |
355 | success = 1; | |
356 | break; | |
184eed6a | 357 | |
7368a6c8 | 358 | case SSH_CMSG_EXEC_SHELL: |
359 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 360 | if (type == SSH_CMSG_EXEC_CMD) { |
361 | command = packet_get_string(&dlen); | |
362 | debug("Exec command '%.500s'", command); | |
c95add71 | 363 | do_exec(s, command); |
364 | xfree(command); | |
7368a6c8 | 365 | } else { |
c95add71 | 366 | do_exec(s, NULL); |
7368a6c8 | 367 | } |
95500969 | 368 | packet_check_eom(); |
fc2a1d28 | 369 | session_close(s); |
7368a6c8 | 370 | return; |
371 | ||
372 | default: | |
373 | /* | |
374 | * Any unknown messages in this phase are ignored, | |
375 | * and a failure message is returned. | |
376 | */ | |
bbe88b6d | 377 | logit("Unknown packet type received after authentication: %d", type); |
7368a6c8 | 378 | } |
379 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
380 | packet_send(); | |
381 | packet_write_wait(); | |
382 | ||
383 | /* Enable compression now that we have replied if appropriate. */ | |
384 | if (enable_compression_after_reply) { | |
385 | enable_compression_after_reply = 0; | |
386 | packet_start_compression(compression_level); | |
387 | } | |
388 | } | |
389 | } | |
390 | ||
391 | /* | |
392 | * This is called to fork and execute a command when we have no tty. This | |
393 | * will call do_child from the child, and server_loop from the parent after | |
394 | * setting up file descriptors and such. | |
395 | */ | |
6ae2364d | 396 | void |
65068d16 | 397 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 398 | { |
c457707e | 399 | pid_t pid; |
7368a6c8 | 400 | |
401 | #ifdef USE_PIPES | |
402 | int pin[2], pout[2], perr[2]; | |
403 | /* Allocate pipes for communicating with the program. */ | |
404 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
405 | packet_disconnect("Could not create pipes: %.100s", | |
406 | strerror(errno)); | |
407 | #else /* USE_PIPES */ | |
408 | int inout[2], err[2]; | |
409 | /* Uses socket pairs to communicate with the program. */ | |
410 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
411 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
412 | packet_disconnect("Could not create socket pairs: %.100s", | |
413 | strerror(errno)); | |
414 | #endif /* USE_PIPES */ | |
415 | if (s == NULL) | |
416 | fatal("do_exec_no_pty: no session"); | |
417 | ||
1d1ffb87 | 418 | session_proctitle(s); |
7368a6c8 | 419 | |
b19d61d7 | 420 | #if defined(USE_PAM) |
59f327e0 | 421 | if (options.use_pam && !use_privsep) |
7fceb20d | 422 | do_pam_setcred(1); |
266140a8 | 423 | #endif /* USE_PAM */ |
424 | ||
7368a6c8 | 425 | /* Fork the child. */ |
426 | if ((pid = fork()) == 0) { | |
2362db19 | 427 | is_child = 1; |
516f0d7d | 428 | |
7368a6c8 | 429 | /* Child. Reinitialize the log since the pid has changed. */ |
430 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
431 | ||
432 | /* | |
433 | * Create a new session and process group since the 4.4BSD | |
434 | * setlogin() affects the entire process group. | |
435 | */ | |
436 | if (setsid() < 0) | |
437 | error("setsid failed: %.100s", strerror(errno)); | |
438 | ||
439 | #ifdef USE_PIPES | |
440 | /* | |
441 | * Redirect stdin. We close the parent side of the socket | |
442 | * pair, and make the child side the standard input. | |
443 | */ | |
444 | close(pin[1]); | |
445 | if (dup2(pin[0], 0) < 0) | |
446 | perror("dup2 stdin"); | |
447 | close(pin[0]); | |
448 | ||
449 | /* Redirect stdout. */ | |
450 | close(pout[0]); | |
451 | if (dup2(pout[1], 1) < 0) | |
452 | perror("dup2 stdout"); | |
453 | close(pout[1]); | |
454 | ||
455 | /* Redirect stderr. */ | |
456 | close(perr[0]); | |
457 | if (dup2(perr[1], 2) < 0) | |
458 | perror("dup2 stderr"); | |
459 | close(perr[1]); | |
460 | #else /* USE_PIPES */ | |
461 | /* | |
462 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
463 | * use the same socket, as some programs (particularly rdist) | |
464 | * seem to depend on it. | |
465 | */ | |
466 | close(inout[1]); | |
467 | close(err[1]); | |
468 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
469 | perror("dup2 stdin"); | |
470 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
471 | perror("dup2 stdout"); | |
472 | if (dup2(err[0], 2) < 0) /* stderr */ | |
473 | perror("dup2 stderr"); | |
474 | #endif /* USE_PIPES */ | |
475 | ||
ef51930f | 476 | #ifdef _UNICOS |
477 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
478 | #endif | |
479 | ||
7368a6c8 | 480 | /* Do processing for the child (exec command etc). */ |
56b3e9ce | 481 | do_child(s, command); |
7368a6c8 | 482 | /* NOTREACHED */ |
483 | } | |
ef51930f | 484 | #ifdef _UNICOS |
485 | signal(WJSIGNAL, cray_job_termination_handler); | |
486 | #endif /* _UNICOS */ | |
3c62e7eb | 487 | #ifdef HAVE_CYGWIN |
488 | if (is_winnt) | |
489 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
490 | #endif | |
7368a6c8 | 491 | if (pid < 0) |
492 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
493 | s->pid = pid; | |
b5c334cc | 494 | /* Set interactive/non-interactive mode. */ |
495 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 496 | #ifdef USE_PIPES |
497 | /* We are the parent. Close the child sides of the pipes. */ | |
498 | close(pin[0]); | |
499 | close(pout[1]); | |
500 | close(perr[1]); | |
501 | ||
e78a59f5 | 502 | if (compat20) { |
d7ecbe88 | 503 | if (s->is_subsystem) { |
504 | close(perr[0]); | |
505 | perr[0] = -1; | |
506 | } | |
507 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
e78a59f5 | 508 | } else { |
509 | /* Enter the interactive session. */ | |
510 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 511 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 512 | } |
7368a6c8 | 513 | #else /* USE_PIPES */ |
514 | /* We are the parent. Close the child sides of the socket pairs. */ | |
515 | close(inout[0]); | |
516 | close(err[0]); | |
517 | ||
75dbfa01 | 518 | /* |
519 | * Clear loginmsg, since it's the child's responsibility to display | |
520 | * it to the user, otherwise multiple sessions may accumulate | |
521 | * multiple copies of the login messages. | |
522 | */ | |
523 | buffer_clear(&loginmsg); | |
524 | ||
7368a6c8 | 525 | /* |
526 | * Enter the interactive session. Note: server_loop must be able to | |
527 | * handle the case that fdin and fdout are the same. | |
528 | */ | |
e78a59f5 | 529 | if (compat20) { |
e5d7a405 | 530 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 531 | } else { |
532 | server_loop(pid, inout[1], inout[1], err[1]); | |
533 | /* server_loop has closed inout[1] and err[1]. */ | |
534 | } | |
7368a6c8 | 535 | #endif /* USE_PIPES */ |
536 | } | |
537 | ||
538 | /* | |
539 | * This is called to fork and execute a command when we have a tty. This | |
540 | * will call do_child from the child, and server_loop from the parent after | |
541 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
542 | * lastlog, and other such operations. | |
543 | */ | |
6ae2364d | 544 | void |
65068d16 | 545 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 546 | { |
7368a6c8 | 547 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 548 | pid_t pid; |
7368a6c8 | 549 | |
550 | if (s == NULL) | |
551 | fatal("do_exec_pty: no session"); | |
552 | ptyfd = s->ptyfd; | |
553 | ttyfd = s->ttyfd; | |
554 | ||
b19d61d7 | 555 | #if defined(USE_PAM) |
7fceb20d | 556 | if (options.use_pam) { |
49e82bb9 | 557 | do_pam_set_tty(s->tty); |
72037bc8 | 558 | if (!use_privsep) |
559 | do_pam_setcred(1); | |
7fceb20d | 560 | } |
27cf96de | 561 | #endif |
266140a8 | 562 | |
7368a6c8 | 563 | /* Fork the child. */ |
564 | if ((pid = fork()) == 0) { | |
2362db19 | 565 | is_child = 1; |
57156994 | 566 | |
c345cf9d | 567 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 568 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 569 | /* Close the master side of the pseudo tty. */ |
570 | close(ptyfd); | |
571 | ||
572 | /* Make the pseudo tty our controlling tty. */ | |
573 | pty_make_controlling_tty(&ttyfd, s->tty); | |
574 | ||
05fd093c | 575 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
576 | if (dup2(ttyfd, 0) < 0) | |
577 | error("dup2 stdin: %s", strerror(errno)); | |
578 | if (dup2(ttyfd, 1) < 0) | |
579 | error("dup2 stdout: %s", strerror(errno)); | |
580 | if (dup2(ttyfd, 2) < 0) | |
581 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 582 | |
583 | /* Close the extra descriptor for the pseudo tty. */ | |
584 | close(ttyfd); | |
585 | ||
c345cf9d | 586 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 587 | #ifndef HAVE_OSF_SIA |
ef51930f | 588 | if (!(options.use_login && command == NULL)) { |
589 | #ifdef _UNICOS | |
590 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
591 | #endif /* _UNICOS */ | |
a22aff1f | 592 | do_login(s, command); |
ef51930f | 593 | } |
7e2d5fa4 | 594 | # ifdef LOGIN_NEEDS_UTMPX |
595 | else | |
596 | do_pre_login(s); | |
597 | # endif | |
c96a4aaf | 598 | #endif |
7368a6c8 | 599 | |
7368a6c8 | 600 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 601 | do_child(s, command); |
7368a6c8 | 602 | /* NOTREACHED */ |
603 | } | |
ef51930f | 604 | #ifdef _UNICOS |
605 | signal(WJSIGNAL, cray_job_termination_handler); | |
606 | #endif /* _UNICOS */ | |
3c62e7eb | 607 | #ifdef HAVE_CYGWIN |
608 | if (is_winnt) | |
609 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
610 | #endif | |
7368a6c8 | 611 | if (pid < 0) |
612 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
613 | s->pid = pid; | |
614 | ||
615 | /* Parent. Close the slave side of the pseudo tty. */ | |
616 | close(ttyfd); | |
617 | ||
618 | /* | |
619 | * Create another descriptor of the pty master side for use as the | |
620 | * standard input. We could use the original descriptor, but this | |
621 | * simplifies code in server_loop. The descriptor is bidirectional. | |
622 | */ | |
623 | fdout = dup(ptyfd); | |
624 | if (fdout < 0) | |
625 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
626 | ||
627 | /* we keep a reference to the pty master */ | |
628 | ptymaster = dup(ptyfd); | |
629 | if (ptymaster < 0) | |
630 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
631 | s->ptymaster = ptymaster; | |
632 | ||
633 | /* Enter interactive session. */ | |
b5c334cc | 634 | packet_set_interactive(1); |
e78a59f5 | 635 | if (compat20) { |
636 | session_set_fds(s, ptyfd, fdout, -1); | |
637 | } else { | |
638 | server_loop(pid, ptyfd, fdout, -1); | |
639 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 640 | } |
7368a6c8 | 641 | } |
642 | ||
7e2d5fa4 | 643 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 644 | static void |
7e2d5fa4 | 645 | do_pre_login(Session *s) |
646 | { | |
647 | socklen_t fromlen; | |
648 | struct sockaddr_storage from; | |
649 | pid_t pid = getpid(); | |
650 | ||
651 | /* | |
652 | * Get IP address of client. If the connection is not a socket, let | |
653 | * the address be 0.0.0.0. | |
654 | */ | |
655 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 656 | fromlen = sizeof(from); |
7e2d5fa4 | 657 | if (packet_connection_is_on_socket()) { |
7e2d5fa4 | 658 | if (getpeername(packet_get_connection_in(), |
32596c7b | 659 | (struct sockaddr *)&from, &fromlen) < 0) { |
7e2d5fa4 | 660 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 661 | cleanup_exit(255); |
7e2d5fa4 | 662 | } |
663 | } | |
664 | ||
665 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
c5a7d788 | 666 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d4ac26ed | 667 | (struct sockaddr *)&from, fromlen); |
7e2d5fa4 | 668 | } |
669 | #endif | |
670 | ||
dac6753b | 671 | /* |
672 | * This is called to fork and execute a command. If another command is | |
673 | * to be forced, execute that instead. | |
674 | */ | |
675 | void | |
676 | do_exec(Session *s, const char *command) | |
677 | { | |
e7259e8d | 678 | if (options.adm_forced_command) { |
679 | original_command = command; | |
680 | command = options.adm_forced_command; | |
681 | debug("Forced command (config) '%.900s'", command); | |
682 | } else if (forced_command) { | |
dac6753b | 683 | original_command = command; |
684 | command = forced_command; | |
e7259e8d | 685 | debug("Forced command (key option) '%.900s'", command); |
dac6753b | 686 | } |
687 | ||
6039eeef | 688 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 689 | if (command != NULL) |
690 | PRIVSEP(audit_run_command(command)); | |
691 | else if (s->ttyfd == -1) { | |
692 | char *shell = s->pw->pw_shell; | |
693 | ||
694 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
695 | shell =_PATH_BSHELL; | |
696 | PRIVSEP(audit_run_command(shell)); | |
697 | } | |
698 | #endif | |
699 | ||
dac6753b | 700 | if (s->ttyfd != -1) |
701 | do_exec_pty(s, command); | |
702 | else | |
703 | do_exec_no_pty(s, command); | |
704 | ||
c95add71 | 705 | original_command = NULL; |
dac6753b | 706 | |
be2ca0c9 | 707 | /* |
708 | * Clear loginmsg: it's the child's responsibility to display | |
709 | * it to the user, otherwise multiple sessions may accumulate | |
710 | * multiple copies of the login messages. | |
711 | */ | |
712 | buffer_clear(&loginmsg); | |
713 | } | |
f7342052 | 714 | |
c345cf9d | 715 | /* administrative, login(1)-like work */ |
716 | void | |
a22aff1f | 717 | do_login(Session *s, const char *command) |
c345cf9d | 718 | { |
c345cf9d | 719 | socklen_t fromlen; |
720 | struct sockaddr_storage from; | |
c345cf9d | 721 | struct passwd * pw = s->pw; |
722 | pid_t pid = getpid(); | |
723 | ||
724 | /* | |
725 | * Get IP address of client. If the connection is not a socket, let | |
726 | * the address be 0.0.0.0. | |
727 | */ | |
728 | memset(&from, 0, sizeof(from)); | |
d4ac26ed | 729 | fromlen = sizeof(from); |
c345cf9d | 730 | if (packet_connection_is_on_socket()) { |
c345cf9d | 731 | if (getpeername(packet_get_connection_in(), |
f7342052 | 732 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 733 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 734 | cleanup_exit(255); |
c345cf9d | 735 | } |
736 | } | |
737 | ||
738 | /* Record that there was a login on that tty from the remote host. */ | |
49a34e84 | 739 | if (!use_privsep) |
740 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
741 | get_remote_name_or_ip(utmp_len, | |
c5a7d788 | 742 | options.use_dns), |
ba1566dd | 743 | (struct sockaddr *)&from, fromlen); |
c345cf9d | 744 | |
2919e060 | 745 | #ifdef USE_PAM |
746 | /* | |
747 | * If password change is needed, do it now. | |
748 | * This needs to occur before the ~/.hushlogin check. | |
749 | */ | |
dd1fb864 | 750 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
751 | display_loginmsg(); | |
2919e060 | 752 | do_pam_chauthtok(); |
dd1fb864 | 753 | s->authctxt->force_pwchange = 0; |
5b9e2464 | 754 | /* XXX - signal [net] parent to enable forwardings */ |
2919e060 | 755 | } |
756 | #endif | |
757 | ||
f2c2fd71 | 758 | if (check_quietlogin(s, command)) |
c345cf9d | 759 | return; |
760 | ||
dd1fb864 | 761 | display_loginmsg(); |
c345cf9d | 762 | |
f2c2fd71 | 763 | do_motd(); |
764 | } | |
765 | ||
766 | /* | |
767 | * Display the message of the day. | |
768 | */ | |
769 | void | |
770 | do_motd(void) | |
771 | { | |
772 | FILE *f; | |
773 | char buf[256]; | |
774 | ||
c345cf9d | 775 | if (options.print_motd) { |
2e73a022 | 776 | #ifdef HAVE_LOGIN_CAP |
777 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
778 | "/etc/motd"), "r"); | |
779 | #else | |
c345cf9d | 780 | f = fopen("/etc/motd", "r"); |
2e73a022 | 781 | #endif |
c345cf9d | 782 | if (f) { |
783 | while (fgets(buf, sizeof(buf), f)) | |
784 | fputs(buf, stdout); | |
785 | fclose(f); | |
786 | } | |
787 | } | |
788 | } | |
789 | ||
9c328529 | 790 | |
791 | /* | |
792 | * Check for quiet login, either .hushlogin or command given. | |
793 | */ | |
794 | int | |
795 | check_quietlogin(Session *s, const char *command) | |
796 | { | |
797 | char buf[256]; | |
798 | struct passwd *pw = s->pw; | |
799 | struct stat st; | |
800 | ||
801 | /* Return 1 if .hushlogin exists or a command given. */ | |
802 | if (command != NULL) | |
803 | return 1; | |
804 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
805 | #ifdef HAVE_LOGIN_CAP | |
806 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
807 | return 1; | |
808 | #else | |
809 | if (stat(buf, &st) >= 0) | |
810 | return 1; | |
811 | #endif | |
812 | return 0; | |
813 | } | |
814 | ||
7368a6c8 | 815 | /* |
816 | * Sets the value of the given variable in the environment. If the variable | |
817 | * already exists, its value is overriden. | |
818 | */ | |
7364bd04 | 819 | void |
1e3b8b07 | 820 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
184eed6a | 821 | const char *value) |
7368a6c8 | 822 | { |
7368a6c8 | 823 | char **env; |
c46e584f | 824 | u_int envsize; |
825 | u_int i, namelen; | |
7368a6c8 | 826 | |
95b99395 | 827 | /* |
828 | * If we're passed an uninitialized list, allocate a single null | |
829 | * entry before continuing. | |
830 | */ | |
831 | if (*envp == NULL && *envsizep == 0) { | |
832 | *envp = xmalloc(sizeof(char *)); | |
833 | *envp[0] = NULL; | |
834 | *envsizep = 1; | |
835 | } | |
836 | ||
7368a6c8 | 837 | /* |
838 | * Find the slot where the value should be stored. If the variable | |
839 | * already exists, we reuse the slot; otherwise we append a new slot | |
840 | * at the end of the array, expanding if necessary. | |
841 | */ | |
842 | env = *envp; | |
843 | namelen = strlen(name); | |
844 | for (i = 0; env[i]; i++) | |
845 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
846 | break; | |
847 | if (env[i]) { | |
848 | /* Reuse the slot. */ | |
849 | xfree(env[i]); | |
850 | } else { | |
851 | /* New variable. Expand if necessary. */ | |
c46e584f | 852 | envsize = *envsizep; |
853 | if (i >= envsize - 1) { | |
854 | if (envsize >= 1000) | |
855 | fatal("child_set_env: too many env vars"); | |
856 | envsize += 50; | |
c5d10563 | 857 | env = (*envp) = xrealloc(env, envsize, sizeof(char *)); |
c46e584f | 858 | *envsizep = envsize; |
7368a6c8 | 859 | } |
860 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
861 | env[i + 1] = NULL; | |
862 | } | |
863 | ||
864 | /* Allocate space and format the variable in the appropriate slot. */ | |
865 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
866 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
867 | } | |
868 | ||
869 | /* | |
870 | * Reads environment variables from the given file and adds/overrides them | |
871 | * into the environment. If the file does not exist, this does nothing. | |
872 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
873 | * and assignments of the form name=value. No other forms are allowed. | |
874 | */ | |
396c147e | 875 | static void |
1e3b8b07 | 876 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 877 | const char *filename) |
7368a6c8 | 878 | { |
879 | FILE *f; | |
880 | char buf[4096]; | |
881 | char *cp, *value; | |
66087567 | 882 | u_int lineno = 0; |
7368a6c8 | 883 | |
884 | f = fopen(filename, "r"); | |
885 | if (!f) | |
886 | return; | |
887 | ||
888 | while (fgets(buf, sizeof(buf), f)) { | |
66087567 | 889 | if (++lineno > 1000) |
890 | fatal("Too many lines in environment file %s", filename); | |
7368a6c8 | 891 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
892 | ; | |
893 | if (!*cp || *cp == '#' || *cp == '\n') | |
894 | continue; | |
895 | if (strchr(cp, '\n')) | |
896 | *strchr(cp, '\n') = '\0'; | |
897 | value = strchr(cp, '='); | |
898 | if (value == NULL) { | |
66087567 | 899 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
900 | filename); | |
7368a6c8 | 901 | continue; |
902 | } | |
71276795 | 903 | /* |
904 | * Replace the equals sign by nul, and advance value to | |
905 | * the value string. | |
906 | */ | |
7368a6c8 | 907 | *value = '\0'; |
908 | value++; | |
909 | child_set_env(env, envsize, cp, value); | |
910 | } | |
911 | fclose(f); | |
912 | } | |
913 | ||
95b99395 | 914 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
915 | /* | |
916 | * Return named variable from specified environment, or NULL if not present. | |
917 | */ | |
918 | static char * | |
919 | child_get_env(char **env, const char *name) | |
920 | { | |
921 | int i; | |
922 | size_t len; | |
923 | ||
924 | len = strlen(name); | |
925 | for (i=0; env[i] != NULL; i++) | |
926 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
927 | return(env[i] + len + 1); | |
928 | return NULL; | |
929 | } | |
930 | ||
931 | /* | |
932 | * Read /etc/default/login. | |
933 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
934 | */ | |
935 | static void | |
936 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
937 | { | |
938 | char **tmpenv = NULL, *var; | |
6f99680f | 939 | u_int i, tmpenvsize = 0; |
3a23ba0e | 940 | u_long mask; |
95b99395 | 941 | |
942 | /* | |
943 | * We don't want to copy the whole file to the child's environment, | |
944 | * so we use a temporary environment and copy the variables we're | |
945 | * interested in. | |
946 | */ | |
947 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
948 | ||
6f99680f | 949 | if (tmpenv == NULL) |
950 | return; | |
951 | ||
95b99395 | 952 | if (uid == 0) |
953 | var = child_get_env(tmpenv, "SUPATH"); | |
954 | else | |
955 | var = child_get_env(tmpenv, "PATH"); | |
956 | if (var != NULL) | |
957 | child_set_env(env, envsize, "PATH", var); | |
b6453d99 | 958 | |
95b99395 | 959 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
960 | if (sscanf(var, "%5lo", &mask) == 1) | |
3a23ba0e | 961 | umask((mode_t)mask); |
b6453d99 | 962 | |
95b99395 | 963 | for (i = 0; tmpenv[i] != NULL; i++) |
964 | xfree(tmpenv[i]); | |
965 | xfree(tmpenv); | |
966 | } | |
967 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
968 | ||
1db07e7d | 969 | void |
970 | copy_environment(char **source, char ***env, u_int *envsize) | |
7368a6c8 | 971 | { |
760b35a6 | 972 | char *var_name, *var_val; |
7368a6c8 | 973 | int i; |
974 | ||
760b35a6 | 975 | if (source == NULL) |
7368a6c8 | 976 | return; |
2b87da3b | 977 | |
760b35a6 | 978 | for(i = 0; source[i] != NULL; i++) { |
979 | var_name = xstrdup(source[i]); | |
980 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
981 | xfree(var_name); | |
7368a6c8 | 982 | continue; |
7368a6c8 | 983 | } |
760b35a6 | 984 | *var_val++ = '\0'; |
7368a6c8 | 985 | |
760b35a6 | 986 | debug3("Copy environment: %s=%s", var_name, var_val); |
987 | child_set_env(env, envsize, var_name, var_val); | |
b6453d99 | 988 | |
760b35a6 | 989 | xfree(var_name); |
22d89d24 | 990 | } |
991 | } | |
22d89d24 | 992 | |
f7342052 | 993 | static char ** |
994 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 995 | { |
7368a6c8 | 996 | char buf[256]; |
f7342052 | 997 | u_int i, envsize; |
9b09381d | 998 | char **env, *laddr; |
f7342052 | 999 | struct passwd *pw = s->pw; |
9b09381d | 1000 | #ifndef HAVE_LOGIN_CAP |
1001 | char *path = NULL; | |
1002 | #endif | |
7368a6c8 | 1003 | |
7368a6c8 | 1004 | /* Initialize the environment. */ |
1005 | envsize = 100; | |
01d35895 | 1006 | env = xcalloc(envsize, sizeof(char *)); |
7368a6c8 | 1007 | env[0] = NULL; |
1008 | ||
3c62e7eb | 1009 | #ifdef HAVE_CYGWIN |
1010 | /* | |
1011 | * The Windows environment contains some setting which are | |
1012 | * important for a running system. They must not be dropped. | |
1013 | */ | |
3c502155 | 1014 | { |
1015 | char **p; | |
1016 | ||
1017 | p = fetch_windows_environment(); | |
1018 | copy_environment(p, &env, &envsize); | |
1019 | free_windows_environment(p); | |
1020 | } | |
3c62e7eb | 1021 | #endif |
1022 | ||
7364bd04 | 1023 | #ifdef GSSAPI |
aff51935 | 1024 | /* Allow any GSSAPI methods that we've used to alter |
7364bd04 | 1025 | * the childs environment as they see fit |
1026 | */ | |
1027 | ssh_gssapi_do_child(&env, &envsize); | |
1028 | #endif | |
1029 | ||
7368a6c8 | 1030 | if (!options.use_login) { |
1031 | /* Set basic environment. */ | |
61a2c1da | 1032 | for (i = 0; i < s->num_env; i++) |
f2107e97 | 1033 | child_set_env(&env, &envsize, s->env[i].name, |
61a2c1da | 1034 | s->env[i].val); |
1035 | ||
7368a6c8 | 1036 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1037 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
17ed08c5 | 1038 | #ifdef _AIX |
1039 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1040 | #endif | |
7368a6c8 | 1041 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
2e73a022 | 1042 | #ifdef HAVE_LOGIN_CAP |
97686bf9 | 1043 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1044 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1045 | else | |
1046 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1047 | #else /* HAVE_LOGIN_CAP */ |
1048 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1049 | /* |
1050 | * There's no standard path on Windows. The path contains | |
1051 | * important components pointing to the system directories, | |
1052 | * needed for loading shared libraries. So the path better | |
1053 | * remains intact here. | |
1054 | */ | |
95b99395 | 1055 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1056 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1057 | path = child_get_env(env, "PATH"); | |
1058 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1059 | if (path == NULL || *path == '\0') { | |
aff51935 | 1060 | child_set_env(&env, &envsize, "PATH", |
95b99395 | 1061 | s->pw->pw_uid == 0 ? |
1062 | SUPERUSER_PATH : _PATH_STDPATH); | |
1063 | } | |
22d89d24 | 1064 | # endif /* HAVE_CYGWIN */ |
1065 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1066 | |
1067 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1068 | _PATH_MAILDIR, pw->pw_name); | |
1069 | child_set_env(&env, &envsize, "MAIL", buf); | |
1070 | ||
1071 | /* Normal systems set SHELL by default. */ | |
1072 | child_set_env(&env, &envsize, "SHELL", shell); | |
1073 | } | |
1074 | if (getenv("TZ")) | |
1075 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1076 | ||
1077 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 1078 | if (!options.use_login) { |
1079 | while (custom_environment) { | |
1080 | struct envstring *ce = custom_environment; | |
7fdc56c5 | 1081 | char *str = ce->s; |
f7342052 | 1082 | |
7fdc56c5 | 1083 | for (i = 0; str[i] != '=' && str[i]; i++) |
2548961d | 1084 | ; |
7fdc56c5 | 1085 | if (str[i] == '=') { |
1086 | str[i] = 0; | |
1087 | child_set_env(&env, &envsize, str, str + i + 1); | |
2548961d | 1088 | } |
1089 | custom_environment = ce->next; | |
1090 | xfree(ce->s); | |
1091 | xfree(ce); | |
7368a6c8 | 1092 | } |
7368a6c8 | 1093 | } |
1094 | ||
da0561eb | 1095 | /* SSH_CLIENT deprecated */ |
7368a6c8 | 1096 | snprintf(buf, sizeof buf, "%.50s %d %d", |
f7342052 | 1097 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1098 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1099 | ||
3e2f2431 | 1100 | laddr = get_local_ipaddr(packet_get_connection_in()); |
da0561eb | 1101 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
3e2f2431 | 1102 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1103 | xfree(laddr); | |
da0561eb | 1104 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1105 | ||
56b3e9ce | 1106 | if (s->ttyfd != -1) |
1107 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1108 | if (s->term) | |
1109 | child_set_env(&env, &envsize, "TERM", s->term); | |
1110 | if (s->display) | |
1111 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1112 | if (original_command) |
1113 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1114 | original_command); | |
7368a6c8 | 1115 | |
ef51930f | 1116 | #ifdef _UNICOS |
1117 | if (cray_tmpdir[0] != '\0') | |
1118 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1119 | #endif /* _UNICOS */ | |
1120 | ||
3bfd27d5 | 1121 | /* |
1122 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1123 | * must have been set by a native authentication method (eg AIX or | |
1124 | * SIA), so copy it to the child. | |
1125 | */ | |
1126 | { | |
1127 | char *cp; | |
1128 | ||
1129 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1130 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1131 | } | |
1132 | ||
7368a6c8 | 1133 | #ifdef _AIX |
4936fcee | 1134 | { |
1135 | char *cp; | |
1136 | ||
1137 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1138 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
4936fcee | 1139 | read_environment_file(&env, &envsize, "/etc/environment"); |
1140 | } | |
7368a6c8 | 1141 | #endif |
ced49be2 | 1142 | #ifdef KRB5 |
6490a5d5 | 1143 | if (s->authctxt->krb5_ccname) |
ced49be2 | 1144 | child_set_env(&env, &envsize, "KRB5CCNAME", |
6490a5d5 | 1145 | s->authctxt->krb5_ccname); |
ced49be2 | 1146 | #endif |
7368a6c8 | 1147 | #ifdef USE_PAM |
ee48c949 | 1148 | /* |
1149 | * Pull in any environment variables that may have | |
1150 | * been set by PAM. | |
1151 | */ | |
7fceb20d | 1152 | if (options.use_pam) { |
2212fc98 | 1153 | char **p; |
b6453d99 | 1154 | |
2212fc98 | 1155 | p = fetch_pam_child_environment(); |
1156 | copy_environment(p, &env, &envsize); | |
1157 | free_pam_environment(p); | |
ee48c949 | 1158 | |
2212fc98 | 1159 | p = fetch_pam_environment(); |
ee48c949 | 1160 | copy_environment(p, &env, &envsize); |
1161 | free_pam_environment(p); | |
1162 | } | |
7368a6c8 | 1163 | #endif /* USE_PAM */ |
1164 | ||
149cdb60 | 1165 | if (auth_sock_name != NULL) |
7368a6c8 | 1166 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1167 | auth_sock_name); |
7368a6c8 | 1168 | |
1169 | /* read $HOME/.ssh/environment. */ | |
f00bab84 | 1170 | if (options.permit_user_env && !options.use_login) { |
71276795 | 1171 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e2e36358 | 1172 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
7368a6c8 | 1173 | read_environment_file(&env, &envsize, buf); |
1174 | } | |
1175 | if (debug_flag) { | |
1176 | /* dump the environment */ | |
1177 | fprintf(stderr, "Environment:\n"); | |
1178 | for (i = 0; env[i]; i++) | |
1179 | fprintf(stderr, " %.200s\n", env[i]); | |
1180 | } | |
f7342052 | 1181 | return env; |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1186 | * first in this order). | |
1187 | */ | |
1188 | static void | |
1189 | do_rc_files(Session *s, const char *shell) | |
1190 | { | |
1191 | FILE *f = NULL; | |
1192 | char cmd[1024]; | |
1193 | int do_xauth; | |
1194 | struct stat st; | |
1195 | ||
1196 | do_xauth = | |
1197 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1198 | ||
1199 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1200 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1201 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1202 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1203 | if (debug_flag) | |
1204 | fprintf(stderr, "Running %s\n", cmd); | |
1205 | f = popen(cmd, "w"); | |
1206 | if (f) { | |
1207 | if (do_xauth) | |
1208 | fprintf(f, "%s %s\n", s->auth_proto, | |
1209 | s->auth_data); | |
1210 | pclose(f); | |
1211 | } else | |
1212 | fprintf(stderr, "Could not run %s\n", | |
1213 | _PATH_SSH_USER_RC); | |
1214 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1215 | if (debug_flag) | |
1216 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1217 | _PATH_SSH_SYSTEM_RC); | |
1218 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1219 | if (f) { | |
1220 | if (do_xauth) | |
1221 | fprintf(f, "%s %s\n", s->auth_proto, | |
1222 | s->auth_data); | |
1223 | pclose(f); | |
1224 | } else | |
1225 | fprintf(stderr, "Could not run %s\n", | |
1226 | _PATH_SSH_SYSTEM_RC); | |
1227 | } else if (do_xauth && options.xauth_location != NULL) { | |
1228 | /* Add authority data to .Xauthority if appropriate. */ | |
1229 | if (debug_flag) { | |
1230 | fprintf(stderr, | |
fe661d8f | 1231 | "Running %.500s remove %.100s\n", |
2362db19 | 1232 | options.xauth_location, s->auth_display); |
fe661d8f | 1233 | fprintf(stderr, |
1234 | "%.500s add %.100s %.100s %.100s\n", | |
f7342052 | 1235 | options.xauth_location, s->auth_display, |
1236 | s->auth_proto, s->auth_data); | |
1237 | } | |
1238 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1239 | options.xauth_location); | |
1240 | f = popen(cmd, "w"); | |
1241 | if (f) { | |
fe661d8f | 1242 | fprintf(f, "remove %s\n", |
1243 | s->auth_display); | |
f7342052 | 1244 | fprintf(f, "add %s %s %s\n", |
1245 | s->auth_display, s->auth_proto, | |
1246 | s->auth_data); | |
1247 | pclose(f); | |
1248 | } else { | |
1249 | fprintf(stderr, "Could not run %s\n", | |
1250 | cmd); | |
1251 | } | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | static void | |
1256 | do_nologin(struct passwd *pw) | |
1257 | { | |
1258 | FILE *f = NULL; | |
1259 | char buf[1024]; | |
1260 | ||
1261 | #ifdef HAVE_LOGIN_CAP | |
1262 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1263 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1264 | _PATH_NOLOGIN), "r"); | |
1265 | #else | |
1266 | if (pw->pw_uid) | |
1267 | f = fopen(_PATH_NOLOGIN, "r"); | |
1268 | #endif | |
1269 | if (f) { | |
1270 | /* /etc/nologin exists. Print its contents and exit. */ | |
bbe88b6d | 1271 | logit("User %.100s not allowed because %s exists", |
8bd4e2ae | 1272 | pw->pw_name, _PATH_NOLOGIN); |
f7342052 | 1273 | while (fgets(buf, sizeof(buf), f)) |
1274 | fputs(buf, stderr); | |
1275 | fclose(f); | |
99f4fb69 | 1276 | fflush(NULL); |
f7342052 | 1277 | exit(254); |
1278 | } | |
1279 | } | |
1280 | ||
1281 | /* Set login name, uid, gid, and groups. */ | |
1853d1ef | 1282 | void |
f7342052 | 1283 | do_setusercontext(struct passwd *pw) |
1284 | { | |
2731632a | 1285 | #ifndef HAVE_CYGWIN |
1286 | if (getuid() == 0 || geteuid() == 0) | |
f7342052 | 1287 | #endif /* HAVE_CYGWIN */ |
2731632a | 1288 | { |
1289 | ||
8bbfc882 | 1290 | #ifdef HAVE_SETPCRED |
166baacc | 1291 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1292 | fatal("Failed to set process credentials"); | |
8bbfc882 | 1293 | #endif /* HAVE_SETPCRED */ |
f7342052 | 1294 | #ifdef HAVE_LOGIN_CAP |
2d199535 | 1295 | # ifdef __bsdi__ |
8695f9f7 | 1296 | setpgid(0, 0); |
2d199535 | 1297 | # endif |
09d7ebd1 | 1298 | #ifdef GSSAPI |
1299 | if (options.gss_authentication) { | |
1300 | temporarily_use_uid(pw); | |
1301 | ssh_gssapi_storecreds(); | |
1302 | restore_uid(); | |
1303 | } | |
1304 | #endif | |
f4eaee12 | 1305 | # ifdef USE_PAM |
1306 | if (options.use_pam) { | |
1307 | do_pam_session(); | |
1308 | do_pam_setcred(0); | |
1309 | } | |
1310 | # endif /* USE_PAM */ | |
f7342052 | 1311 | if (setusercontext(lc, pw, pw->pw_uid, |
1312 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1313 | perror("unable to set user context"); | |
1314 | exit(1); | |
1315 | } | |
1316 | #else | |
1317 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1318 | /* Sets login uid for accounting */ | |
1319 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1320 | error("setluid: %s", strerror(errno)); | |
1321 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1322 | ||
1323 | if (setlogin(pw->pw_name) < 0) | |
1324 | error("setlogin failed: %s", strerror(errno)); | |
1325 | if (setgid(pw->pw_gid) < 0) { | |
1326 | perror("setgid"); | |
1327 | exit(1); | |
1328 | } | |
1329 | /* Initialize the group list. */ | |
1330 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1331 | perror("initgroups"); | |
1332 | exit(1); | |
1333 | } | |
1334 | endgrent(); | |
09d7ebd1 | 1335 | #ifdef GSSAPI |
1336 | if (options.gss_authentication) { | |
1337 | temporarily_use_uid(pw); | |
1338 | ssh_gssapi_storecreds(); | |
1339 | restore_uid(); | |
1340 | } | |
1341 | #endif | |
f7342052 | 1342 | # ifdef USE_PAM |
1343 | /* | |
aff51935 | 1344 | * PAM credentials may take the form of supplementary groups. |
f7342052 | 1345 | * These will have been wiped by the above initgroups() call. |
1346 | * Reestablish them here. | |
1347 | */ | |
49e82bb9 | 1348 | if (options.use_pam) { |
1349 | do_pam_session(); | |
7fceb20d | 1350 | do_pam_setcred(0); |
49e82bb9 | 1351 | } |
f7342052 | 1352 | # endif /* USE_PAM */ |
1353 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1354 | irix_setusercontext(pw); | |
1355 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
e2bc41f9 | 1356 | # ifdef _AIX |
0ba40daa | 1357 | aix_usrinfo(pw); |
e2bc41f9 | 1358 | # endif /* _AIX */ |
26d07095 | 1359 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
4c653d8e | 1360 | if (set_id(pw->pw_name) != 0) { |
1361 | exit(1); | |
1362 | } | |
26d07095 | 1363 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ |
f7342052 | 1364 | /* Permanently switch to the desired uid. */ |
1365 | permanently_set_uid(pw); | |
1366 | #endif | |
1367 | } | |
2731632a | 1368 | |
1369 | #ifdef HAVE_CYGWIN | |
1370 | if (is_winnt) | |
1371 | #endif | |
f7342052 | 1372 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1373 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
ef4d1846 | 1374 | |
1375 | #ifdef WITH_SELINUX | |
1376 | ssh_selinux_setup_exec_context(pw->pw_name); | |
1377 | #endif | |
f7342052 | 1378 | } |
1379 | ||
37656beb | 1380 | static void |
1381 | do_pwchange(Session *s) | |
1382 | { | |
be2ca0c9 | 1383 | fflush(NULL); |
37656beb | 1384 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1385 | if (s->ttyfd != -1) { | |
f2107e97 | 1386 | fprintf(stderr, |
37656beb | 1387 | "You must change your password now and login again!\n"); |
3ade3b57 | 1388 | #ifdef PASSWD_NEEDS_USERNAME |
1389 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1390 | (char *)NULL); | |
1391 | #else | |
37656beb | 1392 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
3ade3b57 | 1393 | #endif |
37656beb | 1394 | perror("passwd"); |
1395 | } else { | |
1396 | fprintf(stderr, | |
1397 | "Password change required but no TTY available.\n"); | |
1398 | } | |
1399 | exit(1); | |
1400 | } | |
1401 | ||
51aeb639 | 1402 | static void |
1853d1ef | 1403 | launch_login(struct passwd *pw, const char *hostname) |
1404 | { | |
1405 | /* Launch login(1). */ | |
1406 | ||
85cc9118 | 1407 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1408 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1409 | (s->term ? s->term : "unknown"), |
1853d1ef | 1410 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1411 | #ifdef LOGIN_NO_ENDOPT |
1412 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1413 | #else | |
1853d1ef | 1414 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1415 | #endif |
1853d1ef | 1416 | |
1417 | /* Login couldn't be executed, die. */ | |
1418 | ||
1419 | perror("login"); | |
1420 | exit(1); | |
1421 | } | |
1422 | ||
37656beb | 1423 | static void |
1424 | child_close_fds(void) | |
1425 | { | |
1426 | int i; | |
1427 | ||
1428 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1429 | close(packet_get_connection_in()); | |
1430 | else { | |
1431 | close(packet_get_connection_in()); | |
1432 | close(packet_get_connection_out()); | |
1433 | } | |
1434 | /* | |
1435 | * Close all descriptors related to channels. They will still remain | |
1436 | * open in the parent. | |
1437 | */ | |
1438 | /* XXX better use close-on-exec? -markus */ | |
1439 | channel_close_all(); | |
1440 | ||
1441 | /* | |
1442 | * Close any extra file descriptors. Note that there may still be | |
1443 | * descriptors left by system functions. They will be closed later. | |
1444 | */ | |
1445 | endpwent(); | |
1446 | ||
1447 | /* | |
7b9b0103 | 1448 | * Close any extra open file descriptors so that we don't have them |
37656beb | 1449 | * hanging around in clients. Note that we want to do this after |
1450 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1451 | * descriptors open. | |
1452 | */ | |
1453 | for (i = 3; i < 64; i++) | |
1454 | close(i); | |
1455 | } | |
1456 | ||
f7342052 | 1457 | /* |
1458 | * Performs common processing for the child, such as setting up the | |
1459 | * environment, closing extra file descriptors, setting the user and group | |
1460 | * ids, and executing the command or shell. | |
1461 | */ | |
1462 | void | |
1463 | do_child(Session *s, const char *command) | |
1464 | { | |
1465 | extern char **environ; | |
1466 | char **env; | |
1467 | char *argv[10]; | |
1468 | const char *shell, *shell0, *hostname = NULL; | |
1469 | struct passwd *pw = s->pw; | |
f7342052 | 1470 | |
1471 | /* remove hostkey from the child's memory */ | |
1472 | destroy_sensitive_data(); | |
1473 | ||
37656beb | 1474 | /* Force a password change */ |
1475 | if (s->authctxt->force_pwchange) { | |
1476 | do_setusercontext(pw); | |
1477 | child_close_fds(); | |
1478 | do_pwchange(s); | |
1479 | exit(1); | |
1480 | } | |
1481 | ||
f7342052 | 1482 | /* login(1) is only called if we execute the login shell */ |
1483 | if (options.use_login && command != NULL) | |
1484 | options.use_login = 0; | |
1485 | ||
ef51930f | 1486 | #ifdef _UNICOS |
1487 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1488 | #endif /* _UNICOS */ | |
1489 | ||
f7342052 | 1490 | /* |
1491 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1492 | * switch, so we let login(1) to this for us. | |
1493 | */ | |
1494 | if (!options.use_login) { | |
1495 | #ifdef HAVE_OSF_SIA | |
58d0df4e | 1496 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
f7342052 | 1497 | if (!check_quietlogin(s, command)) |
1498 | do_motd(); | |
1499 | #else /* HAVE_OSF_SIA */ | |
0a61a240 | 1500 | /* When PAM is enabled we rely on it to do the nologin check */ |
1501 | if (!options.use_pam) | |
1502 | do_nologin(pw); | |
f7342052 | 1503 | do_setusercontext(pw); |
25bfd4ff | 1504 | /* |
1505 | * PAM session modules in do_setusercontext may have | |
1506 | * generated messages, so if this in an interactive | |
1507 | * login then display them too. | |
1508 | */ | |
d0c890ac | 1509 | if (!check_quietlogin(s, command)) |
25bfd4ff | 1510 | display_loginmsg(); |
f7342052 | 1511 | #endif /* HAVE_OSF_SIA */ |
1512 | } | |
1513 | ||
abdec250 | 1514 | #ifdef USE_PAM |
d9720710 | 1515 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1516 | debug3("PAM session not opened, exiting"); | |
abdec250 | 1517 | display_loginmsg(); |
1518 | exit(254); | |
1519 | } | |
1520 | #endif | |
1521 | ||
f7342052 | 1522 | /* |
1523 | * Get the shell from the password data. An empty shell field is | |
1524 | * legal, and means /bin/sh. | |
1525 | */ | |
1526 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
32214c88 | 1527 | |
1528 | /* | |
1529 | * Make sure $SHELL points to the shell from the password file, | |
1530 | * even if shell is overridden from login.conf | |
1531 | */ | |
1532 | env = do_setup_env(s, shell); | |
1533 | ||
f7342052 | 1534 | #ifdef HAVE_LOGIN_CAP |
1535 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1536 | #endif | |
1537 | ||
2e73a022 | 1538 | /* we have to stash the hostname before we close our socket. */ |
1539 | if (options.use_login) | |
46e3af7f | 1540 | hostname = get_remote_name_or_ip(utmp_len, |
c5a7d788 | 1541 | options.use_dns); |
7368a6c8 | 1542 | /* |
1543 | * Close the connection descriptors; note that this is the child, and | |
1544 | * the server will still have the socket open, and it is important | |
1545 | * that we do not shutdown it. Note that the descriptors cannot be | |
1546 | * closed before building the environment, as we call | |
1547 | * get_remote_ipaddr there. | |
1548 | */ | |
37656beb | 1549 | child_close_fds(); |
7368a6c8 | 1550 | |
7368a6c8 | 1551 | /* |
2a8a6488 | 1552 | * Must take new environment into use so that .ssh/rc, |
1553 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1554 | */ |
1555 | environ = env; | |
1556 | ||
bcfcc5f9 | 1557 | #if defined(KRB5) && defined(USE_AFS) |
a1e30b47 | 1558 | /* |
1559 | * At this point, we check to see if AFS is active and if we have | |
1560 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1561 | * if we can (and need to) extend the ticket into an AFS token. If | |
1562 | * we don't do this, we run into potential problems if the user's | |
1563 | * home directory is in AFS and it's not world-readable. | |
1564 | */ | |
1565 | ||
1566 | if (options.kerberos_get_afs_token && k_hasafs() && | |
4e2e5cfd | 1567 | (s->authctxt->krb5_ctx != NULL)) { |
a1e30b47 | 1568 | char cell[64]; |
1569 | ||
1570 | debug("Getting AFS token"); | |
1571 | ||
1572 | k_setpag(); | |
1573 | ||
1574 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1575 | krb5_afslog(s->authctxt->krb5_ctx, | |
1576 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1577 | ||
1578 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1579 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1580 | } | |
1581 | #endif | |
1582 | ||
7b9b0103 | 1583 | /* Change current directory to the user's home directory. */ |
dab89049 | 1584 | if (chdir(pw->pw_dir) < 0) { |
1585 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1586 | pw->pw_dir, strerror(errno)); | |
1587 | #ifdef HAVE_LOGIN_CAP | |
1588 | if (login_getcapbool(lc, "requirehome", 0)) | |
1589 | exit(1); | |
1590 | #endif | |
1591 | } | |
1592 | ||
f7342052 | 1593 | if (!options.use_login) |
1594 | do_rc_files(s, shell); | |
1d3c30db | 1595 | |
1596 | /* restore SIGPIPE for child */ | |
1597 | signal(SIGPIPE, SIG_DFL); | |
1598 | ||
f7342052 | 1599 | if (options.use_login) { |
1853d1ef | 1600 | launch_login(pw, hostname); |
1601 | /* NEVERREACHED */ | |
f7342052 | 1602 | } |
1603 | ||
1604 | /* Get the last component of the shell name. */ | |
1605 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1606 | shell0++; | |
1607 | else | |
1608 | shell0 = shell; | |
1609 | ||
7368a6c8 | 1610 | /* |
1611 | * If we have no command, execute the shell. In this case, the shell | |
1612 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1613 | * this is a login shell. | |
1614 | */ | |
1615 | if (!command) { | |
f7342052 | 1616 | char argv0[256]; |
7368a6c8 | 1617 | |
f7342052 | 1618 | /* Start the shell. Set initial character to '-'. */ |
1619 | argv0[0] = '-'; | |
7368a6c8 | 1620 | |
f7342052 | 1621 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1622 | >= sizeof(argv0) - 1) { | |
1623 | errno = EINVAL; | |
7368a6c8 | 1624 | perror(shell); |
1625 | exit(1); | |
f7342052 | 1626 | } |
7368a6c8 | 1627 | |
f7342052 | 1628 | /* Execute the shell. */ |
1629 | argv[0] = argv0; | |
1630 | argv[1] = NULL; | |
1631 | execve(shell, argv, env); | |
7368a6c8 | 1632 | |
f7342052 | 1633 | /* Executing the shell failed. */ |
1634 | perror(shell); | |
1635 | exit(1); | |
7368a6c8 | 1636 | } |
1637 | /* | |
1638 | * Execute the command using the user's shell. This uses the -c | |
1639 | * option to execute the command. | |
1640 | */ | |
f7342052 | 1641 | argv[0] = (char *) shell0; |
7368a6c8 | 1642 | argv[1] = "-c"; |
1643 | argv[2] = (char *) command; | |
1644 | argv[3] = NULL; | |
1645 | execve(shell, argv, env); | |
1646 | perror(shell); | |
1647 | exit(1); | |
1648 | } | |
1649 | ||
1650 | Session * | |
1651 | session_new(void) | |
1652 | { | |
1653 | int i; | |
1654 | static int did_init = 0; | |
1655 | if (!did_init) { | |
1656 | debug("session_new: init"); | |
184eed6a | 1657 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1658 | sessions[i].used = 0; |
7368a6c8 | 1659 | } |
1660 | did_init = 1; | |
1661 | } | |
184eed6a | 1662 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1663 | Session *s = &sessions[i]; |
1664 | if (! s->used) { | |
690d0d7f | 1665 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1666 | s->chanid = -1; |
1667 | s->ptyfd = -1; | |
1668 | s->ttyfd = -1; | |
7368a6c8 | 1669 | s->used = 1; |
86066315 | 1670 | s->self = i; |
d08341e6 | 1671 | s->x11_chanids = NULL; |
02323c45 | 1672 | debug("session_new: session %d", i); |
7368a6c8 | 1673 | return s; |
1674 | } | |
1675 | } | |
1676 | return NULL; | |
1677 | } | |
1678 | ||
396c147e | 1679 | static void |
7368a6c8 | 1680 | session_dump(void) |
1681 | { | |
1682 | int i; | |
184eed6a | 1683 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1684 | Session *s = &sessions[i]; |
c457707e | 1685 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1686 | s->used, |
1687 | s->self, | |
1688 | s, | |
1689 | s->chanid, | |
c457707e | 1690 | (long)s->pid); |
7368a6c8 | 1691 | } |
1692 | } | |
1693 | ||
e78a59f5 | 1694 | int |
57156994 | 1695 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1696 | { |
1697 | Session *s = session_new(); | |
1698 | debug("session_open: channel %d", chanid); | |
1699 | if (s == NULL) { | |
1700 | error("no more sessions"); | |
1701 | return 0; | |
1702 | } | |
57156994 | 1703 | s->authctxt = authctxt; |
1704 | s->pw = authctxt->pw; | |
fdaef11e | 1705 | if (s->pw == NULL || !authctxt->valid) |
0725ea77 | 1706 | fatal("no user for session %d", s->self); |
0b242b12 | 1707 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1708 | s->chanid = chanid; | |
e78a59f5 | 1709 | return 1; |
1710 | } | |
1711 | ||
1853d1ef | 1712 | Session * |
1713 | session_by_tty(char *tty) | |
1714 | { | |
1715 | int i; | |
1716 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1717 | Session *s = &sessions[i]; | |
1718 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1719 | debug("session_by_tty: session %d tty %s", i, tty); | |
1720 | return s; | |
1721 | } | |
1722 | } | |
1723 | debug("session_by_tty: unknown tty %.100s", tty); | |
1724 | session_dump(); | |
1725 | return NULL; | |
1726 | } | |
1727 | ||
396c147e | 1728 | static Session * |
e78a59f5 | 1729 | session_by_channel(int id) |
1730 | { | |
1731 | int i; | |
184eed6a | 1732 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1733 | Session *s = &sessions[i]; |
1734 | if (s->used && s->chanid == id) { | |
1735 | debug("session_by_channel: session %d channel %d", i, id); | |
1736 | return s; | |
1737 | } | |
1738 | } | |
1739 | debug("session_by_channel: unknown channel %d", id); | |
1740 | session_dump(); | |
1741 | return NULL; | |
1742 | } | |
1743 | ||
d08341e6 | 1744 | static Session * |
1745 | session_by_x11_channel(int id) | |
1746 | { | |
1747 | int i, j; | |
1748 | ||
1749 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1750 | Session *s = &sessions[i]; | |
1751 | ||
1752 | if (s->x11_chanids == NULL || !s->used) | |
1753 | continue; | |
1754 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
1755 | if (s->x11_chanids[j] == id) { | |
1756 | debug("session_by_x11_channel: session %d " | |
1757 | "channel %d", s->self, id); | |
1758 | return s; | |
1759 | } | |
1760 | } | |
1761 | } | |
1762 | debug("session_by_x11_channel: unknown channel %d", id); | |
1763 | session_dump(); | |
1764 | return NULL; | |
1765 | } | |
1766 | ||
396c147e | 1767 | static Session * |
e78a59f5 | 1768 | session_by_pid(pid_t pid) |
1769 | { | |
1770 | int i; | |
c457707e | 1771 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1772 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1773 | Session *s = &sessions[i]; |
1774 | if (s->used && s->pid == pid) | |
1775 | return s; | |
1776 | } | |
c457707e | 1777 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1778 | session_dump(); |
1779 | return NULL; | |
1780 | } | |
1781 | ||
396c147e | 1782 | static int |
e78a59f5 | 1783 | session_window_change_req(Session *s) |
1784 | { | |
1785 | s->col = packet_get_int(); | |
1786 | s->row = packet_get_int(); | |
1787 | s->xpixel = packet_get_int(); | |
1788 | s->ypixel = packet_get_int(); | |
95500969 | 1789 | packet_check_eom(); |
e78a59f5 | 1790 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1791 | return 1; | |
1792 | } | |
1793 | ||
396c147e | 1794 | static int |
e78a59f5 | 1795 | session_pty_req(Session *s) |
1796 | { | |
1e3b8b07 | 1797 | u_int len; |
30dcc918 | 1798 | int n_bytes; |
762715ce | 1799 | |
653d5f86 | 1800 | if (no_pty_flag) { |
1801 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1802 | return 0; |
653d5f86 | 1803 | } |
1804 | if (s->ttyfd != -1) { | |
1805 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1806 | return 0; |
653d5f86 | 1807 | } |
1808 | ||
e78a59f5 | 1809 | s->term = packet_get_string(&len); |
653d5f86 | 1810 | |
1811 | if (compat20) { | |
1812 | s->col = packet_get_int(); | |
1813 | s->row = packet_get_int(); | |
1814 | } else { | |
1815 | s->row = packet_get_int(); | |
1816 | s->col = packet_get_int(); | |
1817 | } | |
e78a59f5 | 1818 | s->xpixel = packet_get_int(); |
1819 | s->ypixel = packet_get_int(); | |
1820 | ||
1821 | if (strcmp(s->term, "") == 0) { | |
1822 | xfree(s->term); | |
1823 | s->term = NULL; | |
1824 | } | |
653d5f86 | 1825 | |
e78a59f5 | 1826 | /* Allocate a pty and open it. */ |
653d5f86 | 1827 | debug("Allocating pty."); |
1853d1ef | 1828 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1829 | if (s->term) |
1830 | xfree(s->term); | |
e78a59f5 | 1831 | s->term = NULL; |
1832 | s->ptyfd = -1; | |
1833 | s->ttyfd = -1; | |
1834 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1835 | return 0; |
e78a59f5 | 1836 | } |
1837 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1838 | |
1839 | /* for SSH1 the tty modes length is not given */ | |
1840 | if (!compat20) | |
1841 | n_bytes = packet_remaining(); | |
1842 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1843 | ||
1853d1ef | 1844 | if (!use_privsep) |
1845 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1846 | |
1847 | /* Set window size from the packet. */ | |
e78a59f5 | 1848 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1849 | ||
95500969 | 1850 | packet_check_eom(); |
1d1ffb87 | 1851 | session_proctitle(s); |
e78a59f5 | 1852 | return 1; |
1853 | } | |
1854 | ||
396c147e | 1855 | static int |
0b242b12 | 1856 | session_subsystem_req(Session *s) |
1857 | { | |
01855277 | 1858 | struct stat st; |
1e3b8b07 | 1859 | u_int len; |
0b242b12 | 1860 | int success = 0; |
d66ce1a1 | 1861 | char *prog, *cmd, *subsys = packet_get_string(&len); |
2ceb8101 | 1862 | u_int i; |
0b242b12 | 1863 | |
95500969 | 1864 | packet_check_eom(); |
bbe88b6d | 1865 | logit("subsystem request for %.100s", subsys); |
0b242b12 | 1866 | |
38c295d6 | 1867 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1868 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
d66ce1a1 | 1869 | prog = options.subsystem_command[i]; |
1870 | cmd = options.subsystem_args[i]; | |
1871 | if (stat(prog, &st) < 0) { | |
1872 | error("subsystem: cannot stat %s: %s", prog, | |
01855277 | 1873 | strerror(errno)); |
1874 | break; | |
1875 | } | |
1876 | debug("subsystem: exec() %s", cmd); | |
e5d7a405 | 1877 | s->is_subsystem = 1; |
01855277 | 1878 | do_exec(s, cmd); |
38c295d6 | 1879 | success = 1; |
24932ee9 | 1880 | break; |
38c295d6 | 1881 | } |
1882 | } | |
1883 | ||
1884 | if (!success) | |
bbe88b6d | 1885 | logit("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1886 | subsys); |
38c295d6 | 1887 | |
0b242b12 | 1888 | xfree(subsys); |
1889 | return success; | |
1890 | } | |
1891 | ||
396c147e | 1892 | static int |
0b242b12 | 1893 | session_x11_req(Session *s) |
1894 | { | |
8dcd9d5c | 1895 | int success; |
0b242b12 | 1896 | |
d08341e6 | 1897 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
1898 | error("session_x11_req: session %d: " | |
8918b906 | 1899 | "x11 forwarding already active", s->self); |
d08341e6 | 1900 | return 0; |
1901 | } | |
0b242b12 | 1902 | s->single_connection = packet_get_char(); |
1903 | s->auth_proto = packet_get_string(NULL); | |
1904 | s->auth_data = packet_get_string(NULL); | |
1905 | s->screen = packet_get_int(); | |
95500969 | 1906 | packet_check_eom(); |
0b242b12 | 1907 | |
8dcd9d5c | 1908 | success = session_setup_x11fwd(s); |
1909 | if (!success) { | |
0b242b12 | 1910 | xfree(s->auth_proto); |
1911 | xfree(s->auth_data); | |
1500bcdd | 1912 | s->auth_proto = NULL; |
1913 | s->auth_data = NULL; | |
0b242b12 | 1914 | } |
8dcd9d5c | 1915 | return success; |
0b242b12 | 1916 | } |
1917 | ||
396c147e | 1918 | static int |
38c295d6 | 1919 | session_shell_req(Session *s) |
1920 | { | |
95500969 | 1921 | packet_check_eom(); |
dac6753b | 1922 | do_exec(s, NULL); |
38c295d6 | 1923 | return 1; |
1924 | } | |
1925 | ||
396c147e | 1926 | static int |
38c295d6 | 1927 | session_exec_req(Session *s) |
1928 | { | |
1e3b8b07 | 1929 | u_int len; |
38c295d6 | 1930 | char *command = packet_get_string(&len); |
95500969 | 1931 | packet_check_eom(); |
dac6753b | 1932 | do_exec(s, command); |
c95add71 | 1933 | xfree(command); |
38c295d6 | 1934 | return 1; |
1935 | } | |
1936 | ||
16a79097 | 1937 | static int |
1938 | session_break_req(Session *s) | |
1939 | { | |
16a79097 | 1940 | |
f6be21a0 | 1941 | packet_get_int(); /* ignored */ |
16a79097 | 1942 | packet_check_eom(); |
1943 | ||
8168a86a | 1944 | if (s->ttyfd == -1 || |
1945 | tcsendbreak(s->ttyfd, 0) < 0) | |
16a79097 | 1946 | return 0; |
16a79097 | 1947 | return 1; |
1948 | } | |
1949 | ||
61a2c1da | 1950 | static int |
1951 | session_env_req(Session *s) | |
1952 | { | |
1953 | char *name, *val; | |
1954 | u_int name_len, val_len, i; | |
1955 | ||
1956 | name = packet_get_string(&name_len); | |
1957 | val = packet_get_string(&val_len); | |
1958 | packet_check_eom(); | |
1959 | ||
1960 | /* Don't set too many environment variables */ | |
1961 | if (s->num_env > 128) { | |
1962 | debug2("Ignoring env request %s: too many env vars", name); | |
1963 | goto fail; | |
1964 | } | |
1965 | ||
1966 | for (i = 0; i < options.num_accept_env; i++) { | |
1967 | if (match_pattern(name, options.accept_env[i])) { | |
1968 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
c5d10563 | 1969 | s->env = xrealloc(s->env, s->num_env + 1, |
1970 | sizeof(*s->env)); | |
61a2c1da | 1971 | s->env[s->num_env].name = name; |
1972 | s->env[s->num_env].val = val; | |
1973 | s->num_env++; | |
1974 | return (1); | |
1975 | } | |
1976 | } | |
1977 | debug2("Ignoring env request %s: disallowed name", name); | |
1978 | ||
1979 | fail: | |
1980 | xfree(name); | |
1981 | xfree(val); | |
1982 | return (0); | |
1983 | } | |
1984 | ||
396c147e | 1985 | static int |
fa08c86b | 1986 | session_auth_agent_req(Session *s) |
1987 | { | |
1988 | static int called = 0; | |
95500969 | 1989 | packet_check_eom(); |
d343d900 | 1990 | if (no_agent_forwarding_flag) { |
1991 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1992 | return 0; | |
1993 | } | |
fa08c86b | 1994 | if (called) { |
1995 | return 0; | |
1996 | } else { | |
1997 | called = 1; | |
1998 | return auth_input_request_forwarding(s->pw); | |
1999 | } | |
2000 | } | |
2001 | ||
7899c98f | 2002 | int |
2003 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 2004 | { |
e78a59f5 | 2005 | int success = 0; |
e78a59f5 | 2006 | Session *s; |
e78a59f5 | 2007 | |
7899c98f | 2008 | if ((s = session_by_channel(c->self)) == NULL) { |
bbe88b6d | 2009 | logit("session_input_channel_req: no session %d req %.100s", |
7899c98f | 2010 | c->self, rtype); |
2011 | return 0; | |
2012 | } | |
2013 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 2014 | |
2015 | /* | |
e5d7a405 | 2016 | * a session is in LARVAL state until a shell, a command |
2017 | * or a subsystem is executed | |
e78a59f5 | 2018 | */ |
2019 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2020 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 2021 | success = session_shell_req(s); |
e78a59f5 | 2022 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 2023 | success = session_exec_req(s); |
e78a59f5 | 2024 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 2025 | success = session_pty_req(s); |
0b242b12 | 2026 | } else if (strcmp(rtype, "x11-req") == 0) { |
2027 | success = session_x11_req(s); | |
fa08c86b | 2028 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
2029 | success = session_auth_agent_req(s); | |
0b242b12 | 2030 | } else if (strcmp(rtype, "subsystem") == 0) { |
2031 | success = session_subsystem_req(s); | |
61a2c1da | 2032 | } else if (strcmp(rtype, "env") == 0) { |
2033 | success = session_env_req(s); | |
e78a59f5 | 2034 | } |
2035 | } | |
2036 | if (strcmp(rtype, "window-change") == 0) { | |
2037 | success = session_window_change_req(s); | |
c6c76c99 | 2038 | } else if (strcmp(rtype, "break") == 0) { |
2039 | success = session_break_req(s); | |
e78a59f5 | 2040 | } |
c6c76c99 | 2041 | |
7899c98f | 2042 | return success; |
e78a59f5 | 2043 | } |
2044 | ||
2045 | void | |
2046 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2047 | { | |
2048 | if (!compat20) | |
2049 | fatal("session_set_fds: called for proto != 2.0"); | |
2050 | /* | |
2051 | * now that have a child and a pipe to the child, | |
2052 | * we can activate our channel and register the fd's | |
2053 | */ | |
2054 | if (s->chanid == -1) | |
2055 | fatal("no channel for session %d", s->self); | |
2056 | channel_set_fds(s->chanid, | |
2057 | fdout, fdin, fderr, | |
a22aff1f | 2058 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 2059 | 1, |
2060 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 2061 | } |
2062 | ||
86066315 | 2063 | /* |
2064 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2065 | * (e.g., due to a dropped connection). | |
2066 | */ | |
1853d1ef | 2067 | void |
2362db19 | 2068 | session_pty_cleanup2(Session *s) |
7368a6c8 | 2069 | { |
86066315 | 2070 | if (s == NULL) { |
2071 | error("session_pty_cleanup: no session"); | |
2072 | return; | |
2073 | } | |
2074 | if (s->ttyfd == -1) | |
7368a6c8 | 2075 | return; |
2076 | ||
0725ea77 | 2077 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 2078 | |
7368a6c8 | 2079 | /* Record that the user has logged out. */ |
86066315 | 2080 | if (s->pid != 0) |
f3837bc6 | 2081 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 2082 | |
2083 | /* Release the pseudo-tty. */ | |
1853d1ef | 2084 | if (getuid() == 0) |
2085 | pty_release(s->tty); | |
7368a6c8 | 2086 | |
2087 | /* | |
2088 | * Close the server side of the socket pairs. We must do this after | |
2089 | * the pty cleanup, so that another process doesn't get this pty | |
2090 | * while we're still cleaning up. | |
2091 | */ | |
2092 | if (close(s->ptymaster) < 0) | |
1853d1ef | 2093 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 2094 | |
2095 | /* unlink pty from session */ | |
2096 | s->ttyfd = -1; | |
7368a6c8 | 2097 | } |
e78a59f5 | 2098 | |
1853d1ef | 2099 | void |
2362db19 | 2100 | session_pty_cleanup(Session *s) |
1853d1ef | 2101 | { |
2362db19 | 2102 | PRIVSEP(session_pty_cleanup2(s)); |
1853d1ef | 2103 | } |
2104 | ||
6c723e7c | 2105 | static char * |
2106 | sig2name(int sig) | |
2107 | { | |
2108 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2109 | SSH_SIG(ABRT); | |
2110 | SSH_SIG(ALRM); | |
2111 | SSH_SIG(FPE); | |
2112 | SSH_SIG(HUP); | |
2113 | SSH_SIG(ILL); | |
2114 | SSH_SIG(INT); | |
2115 | SSH_SIG(KILL); | |
2116 | SSH_SIG(PIPE); | |
2117 | SSH_SIG(QUIT); | |
2118 | SSH_SIG(SEGV); | |
2119 | SSH_SIG(TERM); | |
2120 | SSH_SIG(USR1); | |
2121 | SSH_SIG(USR2); | |
2122 | #undef SSH_SIG | |
2123 | return "SIG@openssh.com"; | |
2124 | } | |
2125 | ||
d08341e6 | 2126 | static void |
2127 | session_close_x11(int id) | |
2128 | { | |
2129 | Channel *c; | |
2130 | ||
b872f7f0 | 2131 | if ((c = channel_by_id(id)) == NULL) { |
d08341e6 | 2132 | debug("session_close_x11: x11 channel %d missing", id); |
2133 | } else { | |
2134 | /* Detach X11 listener */ | |
2135 | debug("session_close_x11: detach x11 channel %d", id); | |
2136 | channel_cancel_cleanup(id); | |
2137 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2138 | chan_mark_dead(c); | |
2139 | } | |
2140 | } | |
2141 | ||
2142 | static void | |
2143 | session_close_single_x11(int id, void *arg) | |
2144 | { | |
2145 | Session *s; | |
2146 | u_int i; | |
2147 | ||
2148 | debug3("session_close_single_x11: channel %d", id); | |
2149 | channel_cancel_cleanup(id); | |
2150 | if ((s = session_by_x11_channel(id)) == NULL) | |
2151 | fatal("session_close_single_x11: no x11 channel %d", id); | |
2152 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2153 | debug("session_close_single_x11: session %d: " | |
2154 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2155 | /* | |
2156 | * The channel "id" is already closing, but make sure we | |
2157 | * close all of its siblings. | |
2158 | */ | |
2159 | if (s->x11_chanids[i] != id) | |
2160 | session_close_x11(s->x11_chanids[i]); | |
2161 | } | |
2162 | xfree(s->x11_chanids); | |
2163 | s->x11_chanids = NULL; | |
2164 | if (s->display) { | |
2165 | xfree(s->display); | |
2166 | s->display = NULL; | |
2167 | } | |
2168 | if (s->auth_proto) { | |
2169 | xfree(s->auth_proto); | |
2170 | s->auth_proto = NULL; | |
2171 | } | |
2172 | if (s->auth_data) { | |
2173 | xfree(s->auth_data); | |
2174 | s->auth_data = NULL; | |
2175 | } | |
2176 | if (s->auth_display) { | |
2177 | xfree(s->auth_display); | |
2178 | s->auth_display = NULL; | |
2179 | } | |
2180 | } | |
2181 | ||
396c147e | 2182 | static void |
e78a59f5 | 2183 | session_exit_message(Session *s, int status) |
2184 | { | |
2185 | Channel *c; | |
5a4ae906 | 2186 | |
2187 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 2188 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 2189 | s->self, s->chanid); |
c457707e | 2190 | debug("session_exit_message: session %d channel %d pid %ld", |
2191 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 2192 | |
2193 | if (WIFEXITED(status)) { | |
5a4ae906 | 2194 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 2195 | packet_put_int(WEXITSTATUS(status)); |
2196 | packet_send(); | |
2197 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 2198 | channel_request_start(s->chanid, "exit-signal", 0); |
6c723e7c | 2199 | packet_put_cstring(sig2name(WTERMSIG(status))); |
a64009ad | 2200 | #ifdef WCOREDUMP |
e78a59f5 | 2201 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 2202 | #else /* WCOREDUMP */ |
2203 | packet_put_char(0); | |
2204 | #endif /* WCOREDUMP */ | |
e78a59f5 | 2205 | packet_put_cstring(""); |
2206 | packet_put_cstring(""); | |
2207 | packet_send(); | |
2208 | } else { | |
2209 | /* Some weird exit cause. Just exit. */ | |
2210 | packet_disconnect("wait returned status %04x.", status); | |
2211 | } | |
2212 | ||
2213 | /* disconnect channel */ | |
2214 | debug("session_exit_message: release channel %d", s->chanid); | |
8cd0437d | 2215 | |
2216 | /* | |
2217 | * Adjust cleanup callback attachment to send close messages when | |
b4bbf172 | 2218 | * the channel gets EOF. The session will be then be closed |
8cd0437d | 2219 | * by session_close_by_channel when the childs close their fds. |
2220 | */ | |
2221 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2222 | ||
9da5c3c9 | 2223 | /* |
2224 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2225 | * interested in data we write. | |
2226 | * Note that we must not call 'chan_read_failed', since there could | |
2227 | * be some more data waiting in the pipe. | |
2228 | */ | |
0b242b12 | 2229 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
2230 | chan_write_failed(c); | |
e78a59f5 | 2231 | } |
2232 | ||
1853d1ef | 2233 | void |
86066315 | 2234 | session_close(Session *s) |
e78a59f5 | 2235 | { |
2ceb8101 | 2236 | u_int i; |
61a2c1da | 2237 | |
c457707e | 2238 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
2362db19 | 2239 | if (s->ttyfd != -1) |
86066315 | 2240 | session_pty_cleanup(s); |
e78a59f5 | 2241 | if (s->term) |
2242 | xfree(s->term); | |
2243 | if (s->display) | |
2244 | xfree(s->display); | |
d08341e6 | 2245 | if (s->x11_chanids) |
2246 | xfree(s->x11_chanids); | |
f9314d9a | 2247 | if (s->auth_display) |
2248 | xfree(s->auth_display); | |
e78a59f5 | 2249 | if (s->auth_data) |
2250 | xfree(s->auth_data); | |
2251 | if (s->auth_proto) | |
2252 | xfree(s->auth_proto); | |
2253 | s->used = 0; | |
61a2c1da | 2254 | for (i = 0; i < s->num_env; i++) { |
2255 | xfree(s->env[i].name); | |
2256 | xfree(s->env[i].val); | |
2257 | } | |
2258 | if (s->env != NULL) | |
2259 | xfree(s->env); | |
1d1ffb87 | 2260 | session_proctitle(s); |
e78a59f5 | 2261 | } |
2262 | ||
2263 | void | |
2264 | session_close_by_pid(pid_t pid, int status) | |
2265 | { | |
2266 | Session *s = session_by_pid(pid); | |
2267 | if (s == NULL) { | |
c457707e | 2268 | debug("session_close_by_pid: no session for pid %ld", |
2269 | (long)pid); | |
e78a59f5 | 2270 | return; |
2271 | } | |
2272 | if (s->chanid != -1) | |
2273 | session_exit_message(s, status); | |
8cd0437d | 2274 | if (s->ttyfd != -1) |
2275 | session_pty_cleanup(s); | |
4c721c3d | 2276 | s->pid = 0; |
e78a59f5 | 2277 | } |
2278 | ||
2279 | /* | |
2280 | * this is called when a channel dies before | |
2281 | * the session 'child' itself dies | |
2282 | */ | |
2283 | void | |
2284 | session_close_by_channel(int id, void *arg) | |
2285 | { | |
2286 | Session *s = session_by_channel(id); | |
8cd0437d | 2287 | u_int i; |
d08341e6 | 2288 | |
e78a59f5 | 2289 | if (s == NULL) { |
418e724c | 2290 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 2291 | return; |
2292 | } | |
c457707e | 2293 | debug("session_close_by_channel: channel %d child %ld", |
2294 | id, (long)s->pid); | |
d5f24f94 | 2295 | if (s->pid != 0) { |
418e724c | 2296 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 2297 | /* |
2298 | * delay detach of session, but release pty, since | |
2299 | * the fd's to the child are already closed | |
2300 | */ | |
2362db19 | 2301 | if (s->ttyfd != -1) |
efcc9957 | 2302 | session_pty_cleanup(s); |
418e724c | 2303 | return; |
e78a59f5 | 2304 | } |
418e724c | 2305 | /* detach by removing callback */ |
2306 | channel_cancel_cleanup(s->chanid); | |
8cd0437d | 2307 | |
2308 | /* Close any X11 listeners associated with this session */ | |
2309 | if (s->x11_chanids != NULL) { | |
2310 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2311 | session_close_x11(s->x11_chanids[i]); | |
2312 | s->x11_chanids[i] = -1; | |
2313 | } | |
2314 | } | |
2315 | ||
418e724c | 2316 | s->chanid = -1; |
d5f24f94 | 2317 | session_close(s); |
2318 | } | |
2319 | ||
2320 | void | |
1853d1ef | 2321 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 2322 | { |
2323 | int i; | |
184eed6a | 2324 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 2325 | Session *s = &sessions[i]; |
1853d1ef | 2326 | if (s->used) { |
2327 | if (closefunc != NULL) | |
2328 | closefunc(s); | |
2329 | else | |
2330 | session_close(s); | |
2331 | } | |
d5f24f94 | 2332 | } |
e78a59f5 | 2333 | } |
2334 | ||
396c147e | 2335 | static char * |
1d1ffb87 | 2336 | session_tty_list(void) |
2337 | { | |
2338 | static char buf[1024]; | |
2339 | int i; | |
d0104542 | 2340 | char *cp; |
2341 | ||
1d1ffb87 | 2342 | buf[0] = '\0'; |
184eed6a | 2343 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 2344 | Session *s = &sessions[i]; |
2345 | if (s->used && s->ttyfd != -1) { | |
b6453d99 | 2346 | |
d0104542 | 2347 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2348 | cp = strrchr(s->tty, '/'); | |
2349 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2350 | } else | |
2351 | cp = s->tty + 5; | |
b6453d99 | 2352 | |
1d1ffb87 | 2353 | if (buf[0] != '\0') |
2354 | strlcat(buf, ",", sizeof buf); | |
d0104542 | 2355 | strlcat(buf, cp, sizeof buf); |
1d1ffb87 | 2356 | } |
2357 | } | |
2358 | if (buf[0] == '\0') | |
2359 | strlcpy(buf, "notty", sizeof buf); | |
2360 | return buf; | |
2361 | } | |
2362 | ||
2363 | void | |
2364 | session_proctitle(Session *s) | |
2365 | { | |
2366 | if (s->pw == NULL) | |
2367 | error("no user for session %d", s->self); | |
2368 | else | |
2369 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2370 | } | |
2371 | ||
8dcd9d5c | 2372 | int |
2373 | session_setup_x11fwd(Session *s) | |
2374 | { | |
8dcd9d5c | 2375 | struct stat st; |
c9d0ad9b | 2376 | char display[512], auth_display[512]; |
2377 | char hostname[MAXHOSTNAMELEN]; | |
d08341e6 | 2378 | u_int i; |
8dcd9d5c | 2379 | |
2380 | if (no_x11_forwarding_flag) { | |
2381 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2382 | return 0; | |
2383 | } | |
2384 | if (!options.x11_forwarding) { | |
2385 | debug("X11 forwarding disabled in server configuration file."); | |
2386 | return 0; | |
2387 | } | |
2388 | if (!options.xauth_location || | |
2389 | (stat(options.xauth_location, &st) == -1)) { | |
2390 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2391 | return 0; | |
2392 | } | |
ff027d84 | 2393 | if (options.use_login) { |
2394 | packet_send_debug("X11 forwarding disabled; " | |
2395 | "not compatible with UseLogin=yes."); | |
2396 | return 0; | |
2397 | } | |
b44de2b1 | 2398 | if (s->display != NULL) { |
8dcd9d5c | 2399 | debug("X11 display already set."); |
2400 | return 0; | |
2401 | } | |
57f228e8 | 2402 | if (x11_create_display_inet(options.x11_display_offset, |
2403 | options.x11_use_localhost, s->single_connection, | |
d08341e6 | 2404 | &s->display_number, &s->x11_chanids) == -1) { |
b44de2b1 | 2405 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 2406 | return 0; |
2407 | } | |
d08341e6 | 2408 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2409 | channel_register_cleanup(s->x11_chanids[i], | |
8cd0437d | 2410 | session_close_single_x11, 0); |
d08341e6 | 2411 | } |
c9d0ad9b | 2412 | |
2413 | /* Set up a suitable value for the DISPLAY variable. */ | |
2414 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2415 | fatal("gethostname: %.100s", strerror(errno)); | |
2416 | /* | |
2417 | * auth_display must be used as the displayname when the | |
2418 | * authorization entry is added with xauth(1). This will be | |
2419 | * different than the DISPLAY string for localhost displays. | |
2420 | */ | |
e6e573bd | 2421 | if (options.x11_use_localhost) { |
57f228e8 | 2422 | snprintf(display, sizeof display, "localhost:%u.%u", |
c9d0ad9b | 2423 | s->display_number, s->screen); |
57f228e8 | 2424 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
f9314d9a | 2425 | s->display_number, s->screen); |
c9d0ad9b | 2426 | s->display = xstrdup(display); |
f9314d9a | 2427 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 2428 | } else { |
2429 | #ifdef IPADDR_IN_DISPLAY | |
2430 | struct hostent *he; | |
2431 | struct in_addr my_addr; | |
2432 | ||
2433 | he = gethostbyname(hostname); | |
2434 | if (he == NULL) { | |
2435 | error("Can't get IP address for X11 DISPLAY."); | |
2436 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2437 | return 0; | |
2438 | } | |
2439 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
57f228e8 | 2440 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
c9d0ad9b | 2441 | s->display_number, s->screen); |
2442 | #else | |
57f228e8 | 2443 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
c9d0ad9b | 2444 | s->display_number, s->screen); |
2445 | #endif | |
2446 | s->display = xstrdup(display); | |
f9314d9a | 2447 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2448 | } |
2449 | ||
8dcd9d5c | 2450 | return 1; |
2451 | } | |
2452 | ||
396c147e | 2453 | static void |
59c97189 | 2454 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2455 | { |
57156994 | 2456 | server_loop2(authctxt); |
2362db19 | 2457 | } |
2458 | ||
2459 | void | |
2460 | do_cleanup(Authctxt *authctxt) | |
2461 | { | |
2462 | static int called = 0; | |
2463 | ||
2464 | debug("do_cleanup"); | |
2465 | ||
2466 | /* no cleanup if we're in the child for login shell */ | |
2467 | if (is_child) | |
2468 | return; | |
2469 | ||
2470 | /* avoid double cleanup */ | |
2471 | if (called) | |
2472 | return; | |
2473 | called = 1; | |
2474 | ||
2475 | if (authctxt == NULL) | |
2476 | return; | |
2477 | #ifdef KRB5 | |
2478 | if (options.kerberos_ticket_cleanup && | |
2479 | authctxt->krb5_ctx) | |
2480 | krb5_cleanup_proc(authctxt); | |
7364bd04 | 2481 | #endif |
2362db19 | 2482 | |
2483 | #ifdef GSSAPI | |
2484 | if (compat20 && options.gss_cleanup_creds) | |
2485 | ssh_gssapi_cleanup_creds(); | |
2486 | #endif | |
2487 | ||
c6630044 | 2488 | #ifdef USE_PAM |
2489 | if (options.use_pam) { | |
2490 | sshpam_cleanup(); | |
2491 | sshpam_thread_cleanup(); | |
2492 | } | |
2493 | #endif | |
2494 | ||
2362db19 | 2495 | /* remove agent socket */ |
2496 | auth_sock_cleanup_proc(authctxt->pw); | |
2497 | ||
2498 | /* | |
2499 | * Cleanup ptys/utmp only if privsep is disabled, | |
2500 | * or if running in monitor. | |
2501 | */ | |
2502 | if (!use_privsep || mm_is_monitor()) | |
2503 | session_destroy_all(session_pty_cleanup2); | |
e78a59f5 | 2504 | } |