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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" | |
8b6bf4d5 | 36 | RCSID("$OpenBSD: session.c,v 1.197 2006/02/28 01:10:21 djm Exp $"); |
aa2eae64 | 37 | |
38 | #include <sys/types.h> | |
4095f623 | 39 | #ifdef HAVE_SYS_STAT_H |
40 | # include <sys/stat.h> | |
41 | #endif | |
aa2eae64 | 42 | #include <sys/wait.h> |
cebb4c24 | 43 | #include <sys/un.h> |
a75f5360 | 44 | |
b5b88c19 | 45 | #ifdef HAVE_PATHS_H |
a75f5360 | 46 | #include <paths.h> |
b5b88c19 | 47 | #endif |
ada68823 | 48 | #include <signal.h> |
7368a6c8 | 49 | |
7368a6c8 | 50 | #include "ssh.h" |
42f11eb2 | 51 | #include "ssh1.h" |
52 | #include "ssh2.h" | |
53 | #include "xmalloc.h" | |
1729c161 | 54 | #include "sshpty.h" |
7368a6c8 | 55 | #include "packet.h" |
56 | #include "buffer.h" | |
61a2c1da | 57 | #include "match.h" |
7368a6c8 | 58 | #include "uidswap.h" |
59 | #include "compat.h" | |
a5efa1bb | 60 | #include "channels.h" |
e78a59f5 | 61 | #include "bufaux.h" |
e78a59f5 | 62 | #include "auth.h" |
38c295d6 | 63 | #include "auth-options.h" |
42f11eb2 | 64 | #include "pathnames.h" |
65 | #include "log.h" | |
66 | #include "servconf.h" | |
1729c161 | 67 | #include "sshlogin.h" |
42f11eb2 | 68 | #include "serverloop.h" |
69 | #include "canohost.h" | |
5ca51e19 | 70 | #include "session.h" |
07200973 | 71 | #include "kex.h" |
1853d1ef | 72 | #include "monitor_wrap.h" |
e78a59f5 | 73 | |
bcfcc5f9 | 74 | #if defined(KRB5) && defined(USE_AFS) |
39dfceeb | 75 | #include <kafs.h> |
76 | #endif | |
77 | ||
7364bd04 | 78 | #ifdef GSSAPI |
79 | #include "ssh-gss.h" | |
80 | #endif | |
81 | ||
7368a6c8 | 82 | /* func */ |
83 | ||
84 | Session *session_new(void); | |
9c328529 | 85 | void session_set_fds(Session *, int, int, int); |
2362db19 | 86 | void session_pty_cleanup(Session *); |
9c328529 | 87 | void session_proctitle(Session *); |
88 | int session_setup_x11fwd(Session *); | |
89 | void do_exec_pty(Session *, const char *); | |
90 | void do_exec_no_pty(Session *, const char *); | |
91 | void do_exec(Session *, const char *); | |
92 | void do_login(Session *, const char *); | |
8a9ac95d | 93 | #ifdef LOGIN_NEEDS_UTMPX |
94 | static void do_pre_login(Session *s); | |
95 | #endif | |
9c328529 | 96 | void do_child(Session *, const char *); |
f2c2fd71 | 97 | void do_motd(void); |
9c328529 | 98 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 99 | |
396c147e | 100 | static void do_authenticated1(Authctxt *); |
101 | static void do_authenticated2(Authctxt *); | |
9c328529 | 102 | |
396c147e | 103 | static int session_pty_req(Session *); |
bb5639fe | 104 | |
7368a6c8 | 105 | /* import */ |
106 | extern ServerOptions options; | |
107 | extern char *__progname; | |
108 | extern int log_stderr; | |
109 | extern int debug_flag; | |
1e3b8b07 | 110 | extern u_int utmp_len; |
089fbbd2 | 111 | extern int startup_pipe; |
e78e738a | 112 | extern void destroy_sensitive_data(void); |
bc7dfc06 | 113 | extern Buffer loginmsg; |
089fbbd2 | 114 | |
b5e300c2 | 115 | /* original command from peer. */ |
c95add71 | 116 | const char *original_command = NULL; |
b5e300c2 | 117 | |
7368a6c8 | 118 | /* data */ |
119 | #define MAX_SESSIONS 10 | |
120 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 121 | |
2e73a022 | 122 | #ifdef HAVE_LOGIN_CAP |
1836f69f | 123 | login_cap_t *lc; |
2e73a022 | 124 | #endif |
125 | ||
2362db19 | 126 | static int is_child = 0; |
127 | ||
149cdb60 | 128 | /* Name and directory of socket for authentication agent forwarding. */ |
129 | static char *auth_sock_name = NULL; | |
130 | static char *auth_sock_dir = NULL; | |
131 | ||
132 | /* removes the agent forwarding socket */ | |
133 | ||
134 | static void | |
2362db19 | 135 | auth_sock_cleanup_proc(struct passwd *pw) |
149cdb60 | 136 | { |
149cdb60 | 137 | if (auth_sock_name != NULL) { |
138 | temporarily_use_uid(pw); | |
139 | unlink(auth_sock_name); | |
140 | rmdir(auth_sock_dir); | |
141 | auth_sock_name = NULL; | |
142 | restore_uid(); | |
143 | } | |
144 | } | |
145 | ||
146 | static int | |
147 | auth_input_request_forwarding(struct passwd * pw) | |
148 | { | |
149 | Channel *nc; | |
150 | int sock; | |
151 | struct sockaddr_un sunaddr; | |
152 | ||
153 | if (auth_sock_name != NULL) { | |
154 | error("authentication forwarding requested twice."); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
159 | temporarily_use_uid(pw); | |
160 | ||
161 | /* Allocate a buffer for the socket name, and format the name. */ | |
162 | auth_sock_name = xmalloc(MAXPATHLEN); | |
163 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
c88de854 | 164 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
149cdb60 | 165 | |
166 | /* Create private directory for socket */ | |
167 | if (mkdtemp(auth_sock_dir) == NULL) { | |
168 | packet_send_debug("Agent forwarding disabled: " | |
169 | "mkdtemp() failed: %.100s", strerror(errno)); | |
170 | restore_uid(); | |
171 | xfree(auth_sock_name); | |
172 | xfree(auth_sock_dir); | |
173 | auth_sock_name = NULL; | |
174 | auth_sock_dir = NULL; | |
175 | return 0; | |
176 | } | |
c457707e | 177 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
178 | auth_sock_dir, (long) getpid()); | |
149cdb60 | 179 | |
149cdb60 | 180 | /* Create the socket. */ |
181 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
182 | if (sock < 0) | |
183 | packet_disconnect("socket: %.100s", strerror(errno)); | |
184 | ||
185 | /* Bind it to the name. */ | |
186 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
187 | sunaddr.sun_family = AF_UNIX; | |
188 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
189 | ||
190 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
191 | packet_disconnect("bind: %.100s", strerror(errno)); | |
192 | ||
193 | /* Restore the privileged uid. */ | |
194 | restore_uid(); | |
195 | ||
196 | /* Start listening on the socket. */ | |
fce39749 | 197 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
149cdb60 | 198 | packet_disconnect("listen: %.100s", strerror(errno)); |
199 | ||
200 | /* Allocate a channel for the authentication agent socket. */ | |
201 | nc = channel_new("auth socket", | |
202 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
203 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 204 | 0, "auth socket", 1); |
149cdb60 | 205 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
206 | return 1; | |
207 | } | |
208 | ||
dd1fb864 | 209 | static void |
210 | display_loginmsg(void) | |
211 | { | |
56964485 | 212 | if (buffer_len(&loginmsg) > 0) { |
213 | buffer_append(&loginmsg, "\0", 1); | |
214 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
215 | buffer_clear(&loginmsg); | |
216 | } | |
dd1fb864 | 217 | } |
149cdb60 | 218 | |
bb5639fe | 219 | void |
220 | do_authenticated(Authctxt *authctxt) | |
221 | { | |
381b021b | 222 | setproctitle("%s", authctxt->pw->pw_name); |
223 | ||
bb5639fe | 224 | /* setup the channel layer */ |
225 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
226 | channel_permit_all_opens(); | |
227 | ||
228 | if (compat20) | |
229 | do_authenticated2(authctxt); | |
230 | else | |
231 | do_authenticated1(authctxt); | |
e4f7282d | 232 | |
2362db19 | 233 | do_cleanup(authctxt); |
bb5639fe | 234 | } |
235 | ||
7368a6c8 | 236 | /* |
237 | * Prepares for an interactive session. This is called after the user has | |
238 | * been successfully authenticated. During this message exchange, pseudo | |
239 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
240 | * are requested, etc. | |
241 | */ | |
396c147e | 242 | static void |
bb5639fe | 243 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 244 | { |
245 | Session *s; | |
7368a6c8 | 246 | char *command; |
54a5250f | 247 | int success, type, screen_flag; |
7138ebd9 | 248 | int enable_compression_after_reply = 0; |
249 | u_int proto_len, data_len, dlen, compression_level = 0; | |
7368a6c8 | 250 | |
251 | s = session_new(); | |
b0042027 | 252 | if (s == NULL) { |
253 | error("no more sessions"); | |
254 | return; | |
255 | } | |
ced49be2 | 256 | s->authctxt = authctxt; |
bb5639fe | 257 | s->pw = authctxt->pw; |
2e73a022 | 258 | |
7368a6c8 | 259 | /* |
260 | * We stay in this loop until the client requests to execute a shell | |
261 | * or a command. | |
262 | */ | |
263 | for (;;) { | |
bb5639fe | 264 | success = 0; |
7368a6c8 | 265 | |
266 | /* Get a packet from the client. */ | |
54a5250f | 267 | type = packet_read(); |
7368a6c8 | 268 | |
269 | /* Process the packet. */ | |
270 | switch (type) { | |
271 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 272 | compression_level = packet_get_int(); |
95500969 | 273 | packet_check_eom(); |
7368a6c8 | 274 | if (compression_level < 1 || compression_level > 9) { |
d77347cc | 275 | packet_send_debug("Received invalid compression level %d.", |
184eed6a | 276 | compression_level); |
7368a6c8 | 277 | break; |
278 | } | |
07200973 | 279 | if (options.compression == COMP_NONE) { |
636f76ca | 280 | debug2("compression disabled"); |
281 | break; | |
282 | } | |
7368a6c8 | 283 | /* Enable compression after we have responded with SUCCESS. */ |
284 | enable_compression_after_reply = 1; | |
285 | success = 1; | |
286 | break; | |
287 | ||
288 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 289 | success = session_pty_req(s); |
7368a6c8 | 290 | break; |
291 | ||
292 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 293 | s->auth_proto = packet_get_string(&proto_len); |
294 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 295 | |
2af09193 | 296 | screen_flag = packet_get_protocol_flags() & |
297 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
298 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
299 | ||
300 | if (packet_remaining() == 4) { | |
301 | if (!screen_flag) | |
302 | debug2("Buggy client: " | |
303 | "X11 screen flag missing"); | |
7368a6c8 | 304 | s->screen = packet_get_int(); |
c8b058b4 | 305 | } else { |
7368a6c8 | 306 | s->screen = 0; |
c8b058b4 | 307 | } |
95500969 | 308 | packet_check_eom(); |
8dcd9d5c | 309 | success = session_setup_x11fwd(s); |
310 | if (!success) { | |
311 | xfree(s->auth_proto); | |
312 | xfree(s->auth_data); | |
1500bcdd | 313 | s->auth_proto = NULL; |
314 | s->auth_data = NULL; | |
7368a6c8 | 315 | } |
7368a6c8 | 316 | break; |
7368a6c8 | 317 | |
318 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
319 | if (no_agent_forwarding_flag || compat13) { | |
320 | debug("Authentication agent forwarding not permitted for this authentication."); | |
321 | break; | |
322 | } | |
323 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 324 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 325 | break; |
326 | ||
327 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
328 | if (no_port_forwarding_flag) { | |
329 | debug("Port forwarding not permitted for this authentication."); | |
330 | break; | |
331 | } | |
33de75a3 | 332 | if (!options.allow_tcp_forwarding) { |
333 | debug("Port forwarding not permitted."); | |
334 | break; | |
335 | } | |
7368a6c8 | 336 | debug("Received TCP/IP port forwarding request."); |
bb5639fe | 337 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 338 | success = 1; |
339 | break; | |
340 | ||
341 | case SSH_CMSG_MAX_PACKET_SIZE: | |
342 | if (packet_set_maxsize(packet_get_int()) > 0) | |
343 | success = 1; | |
344 | break; | |
184eed6a | 345 | |
7368a6c8 | 346 | case SSH_CMSG_EXEC_SHELL: |
347 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 348 | if (type == SSH_CMSG_EXEC_CMD) { |
349 | command = packet_get_string(&dlen); | |
350 | debug("Exec command '%.500s'", command); | |
c95add71 | 351 | do_exec(s, command); |
352 | xfree(command); | |
7368a6c8 | 353 | } else { |
c95add71 | 354 | do_exec(s, NULL); |
7368a6c8 | 355 | } |
95500969 | 356 | packet_check_eom(); |
fc2a1d28 | 357 | session_close(s); |
7368a6c8 | 358 | return; |
359 | ||
360 | default: | |
361 | /* | |
362 | * Any unknown messages in this phase are ignored, | |
363 | * and a failure message is returned. | |
364 | */ | |
bbe88b6d | 365 | logit("Unknown packet type received after authentication: %d", type); |
7368a6c8 | 366 | } |
367 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
368 | packet_send(); | |
369 | packet_write_wait(); | |
370 | ||
371 | /* Enable compression now that we have replied if appropriate. */ | |
372 | if (enable_compression_after_reply) { | |
373 | enable_compression_after_reply = 0; | |
374 | packet_start_compression(compression_level); | |
375 | } | |
376 | } | |
377 | } | |
378 | ||
379 | /* | |
380 | * This is called to fork and execute a command when we have no tty. This | |
381 | * will call do_child from the child, and server_loop from the parent after | |
382 | * setting up file descriptors and such. | |
383 | */ | |
6ae2364d | 384 | void |
65068d16 | 385 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 386 | { |
c457707e | 387 | pid_t pid; |
7368a6c8 | 388 | |
389 | #ifdef USE_PIPES | |
390 | int pin[2], pout[2], perr[2]; | |
391 | /* Allocate pipes for communicating with the program. */ | |
392 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
393 | packet_disconnect("Could not create pipes: %.100s", | |
394 | strerror(errno)); | |
395 | #else /* USE_PIPES */ | |
396 | int inout[2], err[2]; | |
397 | /* Uses socket pairs to communicate with the program. */ | |
398 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
399 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
400 | packet_disconnect("Could not create socket pairs: %.100s", | |
401 | strerror(errno)); | |
402 | #endif /* USE_PIPES */ | |
403 | if (s == NULL) | |
404 | fatal("do_exec_no_pty: no session"); | |
405 | ||
1d1ffb87 | 406 | session_proctitle(s); |
7368a6c8 | 407 | |
b19d61d7 | 408 | #if defined(USE_PAM) |
59f327e0 | 409 | if (options.use_pam && !use_privsep) |
7fceb20d | 410 | do_pam_setcred(1); |
266140a8 | 411 | #endif /* USE_PAM */ |
412 | ||
7368a6c8 | 413 | /* Fork the child. */ |
414 | if ((pid = fork()) == 0) { | |
2362db19 | 415 | is_child = 1; |
516f0d7d | 416 | |
7368a6c8 | 417 | /* Child. Reinitialize the log since the pid has changed. */ |
418 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
419 | ||
420 | /* | |
421 | * Create a new session and process group since the 4.4BSD | |
422 | * setlogin() affects the entire process group. | |
423 | */ | |
424 | if (setsid() < 0) | |
425 | error("setsid failed: %.100s", strerror(errno)); | |
426 | ||
427 | #ifdef USE_PIPES | |
428 | /* | |
429 | * Redirect stdin. We close the parent side of the socket | |
430 | * pair, and make the child side the standard input. | |
431 | */ | |
432 | close(pin[1]); | |
433 | if (dup2(pin[0], 0) < 0) | |
434 | perror("dup2 stdin"); | |
435 | close(pin[0]); | |
436 | ||
437 | /* Redirect stdout. */ | |
438 | close(pout[0]); | |
439 | if (dup2(pout[1], 1) < 0) | |
440 | perror("dup2 stdout"); | |
441 | close(pout[1]); | |
442 | ||
443 | /* Redirect stderr. */ | |
444 | close(perr[0]); | |
445 | if (dup2(perr[1], 2) < 0) | |
446 | perror("dup2 stderr"); | |
447 | close(perr[1]); | |
448 | #else /* USE_PIPES */ | |
449 | /* | |
450 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
451 | * use the same socket, as some programs (particularly rdist) | |
452 | * seem to depend on it. | |
453 | */ | |
454 | close(inout[1]); | |
455 | close(err[1]); | |
456 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
457 | perror("dup2 stdin"); | |
458 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
459 | perror("dup2 stdout"); | |
460 | if (dup2(err[0], 2) < 0) /* stderr */ | |
461 | perror("dup2 stderr"); | |
462 | #endif /* USE_PIPES */ | |
463 | ||
ef51930f | 464 | #ifdef _UNICOS |
465 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
466 | #endif | |
467 | ||
7368a6c8 | 468 | /* Do processing for the child (exec command etc). */ |
56b3e9ce | 469 | do_child(s, command); |
7368a6c8 | 470 | /* NOTREACHED */ |
471 | } | |
ef51930f | 472 | #ifdef _UNICOS |
473 | signal(WJSIGNAL, cray_job_termination_handler); | |
474 | #endif /* _UNICOS */ | |
3c62e7eb | 475 | #ifdef HAVE_CYGWIN |
476 | if (is_winnt) | |
477 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
478 | #endif | |
7368a6c8 | 479 | if (pid < 0) |
480 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
481 | s->pid = pid; | |
b5c334cc | 482 | /* Set interactive/non-interactive mode. */ |
483 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 484 | #ifdef USE_PIPES |
485 | /* We are the parent. Close the child sides of the pipes. */ | |
486 | close(pin[0]); | |
487 | close(pout[1]); | |
488 | close(perr[1]); | |
489 | ||
e78a59f5 | 490 | if (compat20) { |
d7ecbe88 | 491 | if (s->is_subsystem) { |
492 | close(perr[0]); | |
493 | perr[0] = -1; | |
494 | } | |
495 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
e78a59f5 | 496 | } else { |
497 | /* Enter the interactive session. */ | |
498 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 499 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 500 | } |
7368a6c8 | 501 | #else /* USE_PIPES */ |
502 | /* We are the parent. Close the child sides of the socket pairs. */ | |
503 | close(inout[0]); | |
504 | close(err[0]); | |
505 | ||
75dbfa01 | 506 | /* |
507 | * Clear loginmsg, since it's the child's responsibility to display | |
508 | * it to the user, otherwise multiple sessions may accumulate | |
509 | * multiple copies of the login messages. | |
510 | */ | |
511 | buffer_clear(&loginmsg); | |
512 | ||
7368a6c8 | 513 | /* |
514 | * Enter the interactive session. Note: server_loop must be able to | |
515 | * handle the case that fdin and fdout are the same. | |
516 | */ | |
e78a59f5 | 517 | if (compat20) { |
e5d7a405 | 518 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 519 | } else { |
520 | server_loop(pid, inout[1], inout[1], err[1]); | |
521 | /* server_loop has closed inout[1] and err[1]. */ | |
522 | } | |
7368a6c8 | 523 | #endif /* USE_PIPES */ |
524 | } | |
525 | ||
526 | /* | |
527 | * This is called to fork and execute a command when we have a tty. This | |
528 | * will call do_child from the child, and server_loop from the parent after | |
529 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
530 | * lastlog, and other such operations. | |
531 | */ | |
6ae2364d | 532 | void |
65068d16 | 533 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 534 | { |
7368a6c8 | 535 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 536 | pid_t pid; |
7368a6c8 | 537 | |
538 | if (s == NULL) | |
539 | fatal("do_exec_pty: no session"); | |
540 | ptyfd = s->ptyfd; | |
541 | ttyfd = s->ttyfd; | |
542 | ||
b19d61d7 | 543 | #if defined(USE_PAM) |
7fceb20d | 544 | if (options.use_pam) { |
49e82bb9 | 545 | do_pam_set_tty(s->tty); |
72037bc8 | 546 | if (!use_privsep) |
547 | do_pam_setcred(1); | |
7fceb20d | 548 | } |
27cf96de | 549 | #endif |
266140a8 | 550 | |
7368a6c8 | 551 | /* Fork the child. */ |
552 | if ((pid = fork()) == 0) { | |
2362db19 | 553 | is_child = 1; |
57156994 | 554 | |
c345cf9d | 555 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 556 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 557 | /* Close the master side of the pseudo tty. */ |
558 | close(ptyfd); | |
559 | ||
560 | /* Make the pseudo tty our controlling tty. */ | |
561 | pty_make_controlling_tty(&ttyfd, s->tty); | |
562 | ||
05fd093c | 563 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
564 | if (dup2(ttyfd, 0) < 0) | |
565 | error("dup2 stdin: %s", strerror(errno)); | |
566 | if (dup2(ttyfd, 1) < 0) | |
567 | error("dup2 stdout: %s", strerror(errno)); | |
568 | if (dup2(ttyfd, 2) < 0) | |
569 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 570 | |
571 | /* Close the extra descriptor for the pseudo tty. */ | |
572 | close(ttyfd); | |
573 | ||
c345cf9d | 574 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 575 | #ifndef HAVE_OSF_SIA |
ef51930f | 576 | if (!(options.use_login && command == NULL)) { |
577 | #ifdef _UNICOS | |
578 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
579 | #endif /* _UNICOS */ | |
a22aff1f | 580 | do_login(s, command); |
ef51930f | 581 | } |
7e2d5fa4 | 582 | # ifdef LOGIN_NEEDS_UTMPX |
583 | else | |
584 | do_pre_login(s); | |
585 | # endif | |
c96a4aaf | 586 | #endif |
7368a6c8 | 587 | |
7368a6c8 | 588 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 589 | do_child(s, command); |
7368a6c8 | 590 | /* NOTREACHED */ |
591 | } | |
ef51930f | 592 | #ifdef _UNICOS |
593 | signal(WJSIGNAL, cray_job_termination_handler); | |
594 | #endif /* _UNICOS */ | |
3c62e7eb | 595 | #ifdef HAVE_CYGWIN |
596 | if (is_winnt) | |
597 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
598 | #endif | |
7368a6c8 | 599 | if (pid < 0) |
600 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
601 | s->pid = pid; | |
602 | ||
603 | /* Parent. Close the slave side of the pseudo tty. */ | |
604 | close(ttyfd); | |
605 | ||
606 | /* | |
607 | * Create another descriptor of the pty master side for use as the | |
608 | * standard input. We could use the original descriptor, but this | |
609 | * simplifies code in server_loop. The descriptor is bidirectional. | |
610 | */ | |
611 | fdout = dup(ptyfd); | |
612 | if (fdout < 0) | |
613 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
614 | ||
615 | /* we keep a reference to the pty master */ | |
616 | ptymaster = dup(ptyfd); | |
617 | if (ptymaster < 0) | |
618 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
619 | s->ptymaster = ptymaster; | |
620 | ||
621 | /* Enter interactive session. */ | |
b5c334cc | 622 | packet_set_interactive(1); |
e78a59f5 | 623 | if (compat20) { |
624 | session_set_fds(s, ptyfd, fdout, -1); | |
625 | } else { | |
626 | server_loop(pid, ptyfd, fdout, -1); | |
627 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 628 | } |
7368a6c8 | 629 | } |
630 | ||
7e2d5fa4 | 631 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 632 | static void |
7e2d5fa4 | 633 | do_pre_login(Session *s) |
634 | { | |
635 | socklen_t fromlen; | |
636 | struct sockaddr_storage from; | |
637 | pid_t pid = getpid(); | |
638 | ||
639 | /* | |
640 | * Get IP address of client. If the connection is not a socket, let | |
641 | * the address be 0.0.0.0. | |
642 | */ | |
643 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 644 | fromlen = sizeof(from); |
7e2d5fa4 | 645 | if (packet_connection_is_on_socket()) { |
7e2d5fa4 | 646 | if (getpeername(packet_get_connection_in(), |
184eed6a | 647 | (struct sockaddr *) & from, &fromlen) < 0) { |
7e2d5fa4 | 648 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 649 | cleanup_exit(255); |
7e2d5fa4 | 650 | } |
651 | } | |
652 | ||
653 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
c5a7d788 | 654 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d4ac26ed | 655 | (struct sockaddr *)&from, fromlen); |
7e2d5fa4 | 656 | } |
657 | #endif | |
658 | ||
dac6753b | 659 | /* |
660 | * This is called to fork and execute a command. If another command is | |
661 | * to be forced, execute that instead. | |
662 | */ | |
663 | void | |
664 | do_exec(Session *s, const char *command) | |
665 | { | |
666 | if (forced_command) { | |
667 | original_command = command; | |
668 | command = forced_command; | |
dac6753b | 669 | debug("Forced command '%.900s'", command); |
670 | } | |
671 | ||
6039eeef | 672 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 673 | if (command != NULL) |
674 | PRIVSEP(audit_run_command(command)); | |
675 | else if (s->ttyfd == -1) { | |
676 | char *shell = s->pw->pw_shell; | |
677 | ||
678 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
679 | shell =_PATH_BSHELL; | |
680 | PRIVSEP(audit_run_command(shell)); | |
681 | } | |
682 | #endif | |
683 | ||
dac6753b | 684 | if (s->ttyfd != -1) |
685 | do_exec_pty(s, command); | |
686 | else | |
687 | do_exec_no_pty(s, command); | |
688 | ||
c95add71 | 689 | original_command = NULL; |
dac6753b | 690 | |
be2ca0c9 | 691 | /* |
692 | * Clear loginmsg: it's the child's responsibility to display | |
693 | * it to the user, otherwise multiple sessions may accumulate | |
694 | * multiple copies of the login messages. | |
695 | */ | |
696 | buffer_clear(&loginmsg); | |
697 | } | |
f7342052 | 698 | |
c345cf9d | 699 | /* administrative, login(1)-like work */ |
700 | void | |
a22aff1f | 701 | do_login(Session *s, const char *command) |
c345cf9d | 702 | { |
c345cf9d | 703 | socklen_t fromlen; |
704 | struct sockaddr_storage from; | |
c345cf9d | 705 | struct passwd * pw = s->pw; |
706 | pid_t pid = getpid(); | |
707 | ||
708 | /* | |
709 | * Get IP address of client. If the connection is not a socket, let | |
710 | * the address be 0.0.0.0. | |
711 | */ | |
712 | memset(&from, 0, sizeof(from)); | |
d4ac26ed | 713 | fromlen = sizeof(from); |
c345cf9d | 714 | if (packet_connection_is_on_socket()) { |
c345cf9d | 715 | if (getpeername(packet_get_connection_in(), |
f7342052 | 716 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 717 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 718 | cleanup_exit(255); |
c345cf9d | 719 | } |
720 | } | |
721 | ||
722 | /* Record that there was a login on that tty from the remote host. */ | |
49a34e84 | 723 | if (!use_privsep) |
724 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
725 | get_remote_name_or_ip(utmp_len, | |
c5a7d788 | 726 | options.use_dns), |
ba1566dd | 727 | (struct sockaddr *)&from, fromlen); |
c345cf9d | 728 | |
2919e060 | 729 | #ifdef USE_PAM |
730 | /* | |
731 | * If password change is needed, do it now. | |
732 | * This needs to occur before the ~/.hushlogin check. | |
733 | */ | |
dd1fb864 | 734 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
735 | display_loginmsg(); | |
2919e060 | 736 | do_pam_chauthtok(); |
dd1fb864 | 737 | s->authctxt->force_pwchange = 0; |
5b9e2464 | 738 | /* XXX - signal [net] parent to enable forwardings */ |
2919e060 | 739 | } |
740 | #endif | |
741 | ||
f2c2fd71 | 742 | if (check_quietlogin(s, command)) |
c345cf9d | 743 | return; |
744 | ||
dd1fb864 | 745 | display_loginmsg(); |
c345cf9d | 746 | |
f2c2fd71 | 747 | do_motd(); |
748 | } | |
749 | ||
750 | /* | |
751 | * Display the message of the day. | |
752 | */ | |
753 | void | |
754 | do_motd(void) | |
755 | { | |
756 | FILE *f; | |
757 | char buf[256]; | |
758 | ||
c345cf9d | 759 | if (options.print_motd) { |
2e73a022 | 760 | #ifdef HAVE_LOGIN_CAP |
761 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
762 | "/etc/motd"), "r"); | |
763 | #else | |
c345cf9d | 764 | f = fopen("/etc/motd", "r"); |
2e73a022 | 765 | #endif |
c345cf9d | 766 | if (f) { |
767 | while (fgets(buf, sizeof(buf), f)) | |
768 | fputs(buf, stdout); | |
769 | fclose(f); | |
770 | } | |
771 | } | |
772 | } | |
773 | ||
9c328529 | 774 | |
775 | /* | |
776 | * Check for quiet login, either .hushlogin or command given. | |
777 | */ | |
778 | int | |
779 | check_quietlogin(Session *s, const char *command) | |
780 | { | |
781 | char buf[256]; | |
782 | struct passwd *pw = s->pw; | |
783 | struct stat st; | |
784 | ||
785 | /* Return 1 if .hushlogin exists or a command given. */ | |
786 | if (command != NULL) | |
787 | return 1; | |
788 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
789 | #ifdef HAVE_LOGIN_CAP | |
790 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
791 | return 1; | |
792 | #else | |
793 | if (stat(buf, &st) >= 0) | |
794 | return 1; | |
795 | #endif | |
796 | return 0; | |
797 | } | |
798 | ||
7368a6c8 | 799 | /* |
800 | * Sets the value of the given variable in the environment. If the variable | |
801 | * already exists, its value is overriden. | |
802 | */ | |
7364bd04 | 803 | void |
1e3b8b07 | 804 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
184eed6a | 805 | const char *value) |
7368a6c8 | 806 | { |
7368a6c8 | 807 | char **env; |
c46e584f | 808 | u_int envsize; |
809 | u_int i, namelen; | |
7368a6c8 | 810 | |
95b99395 | 811 | /* |
812 | * If we're passed an uninitialized list, allocate a single null | |
813 | * entry before continuing. | |
814 | */ | |
815 | if (*envp == NULL && *envsizep == 0) { | |
816 | *envp = xmalloc(sizeof(char *)); | |
817 | *envp[0] = NULL; | |
818 | *envsizep = 1; | |
819 | } | |
820 | ||
7368a6c8 | 821 | /* |
822 | * Find the slot where the value should be stored. If the variable | |
823 | * already exists, we reuse the slot; otherwise we append a new slot | |
824 | * at the end of the array, expanding if necessary. | |
825 | */ | |
826 | env = *envp; | |
827 | namelen = strlen(name); | |
828 | for (i = 0; env[i]; i++) | |
829 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
830 | break; | |
831 | if (env[i]) { | |
832 | /* Reuse the slot. */ | |
833 | xfree(env[i]); | |
834 | } else { | |
835 | /* New variable. Expand if necessary. */ | |
c46e584f | 836 | envsize = *envsizep; |
837 | if (i >= envsize - 1) { | |
838 | if (envsize >= 1000) | |
839 | fatal("child_set_env: too many env vars"); | |
840 | envsize += 50; | |
841 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); | |
842 | *envsizep = envsize; | |
7368a6c8 | 843 | } |
844 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
845 | env[i + 1] = NULL; | |
846 | } | |
847 | ||
848 | /* Allocate space and format the variable in the appropriate slot. */ | |
849 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
850 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
851 | } | |
852 | ||
853 | /* | |
854 | * Reads environment variables from the given file and adds/overrides them | |
855 | * into the environment. If the file does not exist, this does nothing. | |
856 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
857 | * and assignments of the form name=value. No other forms are allowed. | |
858 | */ | |
396c147e | 859 | static void |
1e3b8b07 | 860 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 861 | const char *filename) |
7368a6c8 | 862 | { |
863 | FILE *f; | |
864 | char buf[4096]; | |
865 | char *cp, *value; | |
66087567 | 866 | u_int lineno = 0; |
7368a6c8 | 867 | |
868 | f = fopen(filename, "r"); | |
869 | if (!f) | |
870 | return; | |
871 | ||
872 | while (fgets(buf, sizeof(buf), f)) { | |
66087567 | 873 | if (++lineno > 1000) |
874 | fatal("Too many lines in environment file %s", filename); | |
7368a6c8 | 875 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
876 | ; | |
877 | if (!*cp || *cp == '#' || *cp == '\n') | |
878 | continue; | |
879 | if (strchr(cp, '\n')) | |
880 | *strchr(cp, '\n') = '\0'; | |
881 | value = strchr(cp, '='); | |
882 | if (value == NULL) { | |
66087567 | 883 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
884 | filename); | |
7368a6c8 | 885 | continue; |
886 | } | |
71276795 | 887 | /* |
888 | * Replace the equals sign by nul, and advance value to | |
889 | * the value string. | |
890 | */ | |
7368a6c8 | 891 | *value = '\0'; |
892 | value++; | |
893 | child_set_env(env, envsize, cp, value); | |
894 | } | |
895 | fclose(f); | |
896 | } | |
897 | ||
95b99395 | 898 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
899 | /* | |
900 | * Return named variable from specified environment, or NULL if not present. | |
901 | */ | |
902 | static char * | |
903 | child_get_env(char **env, const char *name) | |
904 | { | |
905 | int i; | |
906 | size_t len; | |
907 | ||
908 | len = strlen(name); | |
909 | for (i=0; env[i] != NULL; i++) | |
910 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
911 | return(env[i] + len + 1); | |
912 | return NULL; | |
913 | } | |
914 | ||
915 | /* | |
916 | * Read /etc/default/login. | |
917 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
918 | */ | |
919 | static void | |
920 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
921 | { | |
922 | char **tmpenv = NULL, *var; | |
6f99680f | 923 | u_int i, tmpenvsize = 0; |
3a23ba0e | 924 | u_long mask; |
95b99395 | 925 | |
926 | /* | |
927 | * We don't want to copy the whole file to the child's environment, | |
928 | * so we use a temporary environment and copy the variables we're | |
929 | * interested in. | |
930 | */ | |
931 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
932 | ||
6f99680f | 933 | if (tmpenv == NULL) |
934 | return; | |
935 | ||
95b99395 | 936 | if (uid == 0) |
937 | var = child_get_env(tmpenv, "SUPATH"); | |
938 | else | |
939 | var = child_get_env(tmpenv, "PATH"); | |
940 | if (var != NULL) | |
941 | child_set_env(env, envsize, "PATH", var); | |
b6453d99 | 942 | |
95b99395 | 943 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
944 | if (sscanf(var, "%5lo", &mask) == 1) | |
3a23ba0e | 945 | umask((mode_t)mask); |
b6453d99 | 946 | |
95b99395 | 947 | for (i = 0; tmpenv[i] != NULL; i++) |
948 | xfree(tmpenv[i]); | |
949 | xfree(tmpenv); | |
950 | } | |
951 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
952 | ||
1db07e7d | 953 | void |
954 | copy_environment(char **source, char ***env, u_int *envsize) | |
7368a6c8 | 955 | { |
760b35a6 | 956 | char *var_name, *var_val; |
7368a6c8 | 957 | int i; |
958 | ||
760b35a6 | 959 | if (source == NULL) |
7368a6c8 | 960 | return; |
2b87da3b | 961 | |
760b35a6 | 962 | for(i = 0; source[i] != NULL; i++) { |
963 | var_name = xstrdup(source[i]); | |
964 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
965 | xfree(var_name); | |
7368a6c8 | 966 | continue; |
7368a6c8 | 967 | } |
760b35a6 | 968 | *var_val++ = '\0'; |
7368a6c8 | 969 | |
760b35a6 | 970 | debug3("Copy environment: %s=%s", var_name, var_val); |
971 | child_set_env(env, envsize, var_name, var_val); | |
b6453d99 | 972 | |
760b35a6 | 973 | xfree(var_name); |
22d89d24 | 974 | } |
975 | } | |
22d89d24 | 976 | |
f7342052 | 977 | static char ** |
978 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 979 | { |
7368a6c8 | 980 | char buf[256]; |
f7342052 | 981 | u_int i, envsize; |
95b99395 | 982 | char **env, *laddr, *path = NULL; |
f7342052 | 983 | struct passwd *pw = s->pw; |
7368a6c8 | 984 | |
7368a6c8 | 985 | /* Initialize the environment. */ |
986 | envsize = 100; | |
987 | env = xmalloc(envsize * sizeof(char *)); | |
988 | env[0] = NULL; | |
989 | ||
3c62e7eb | 990 | #ifdef HAVE_CYGWIN |
991 | /* | |
992 | * The Windows environment contains some setting which are | |
993 | * important for a running system. They must not be dropped. | |
994 | */ | |
3c502155 | 995 | { |
996 | char **p; | |
997 | ||
998 | p = fetch_windows_environment(); | |
999 | copy_environment(p, &env, &envsize); | |
1000 | free_windows_environment(p); | |
1001 | } | |
3c62e7eb | 1002 | #endif |
1003 | ||
7364bd04 | 1004 | #ifdef GSSAPI |
aff51935 | 1005 | /* Allow any GSSAPI methods that we've used to alter |
7364bd04 | 1006 | * the childs environment as they see fit |
1007 | */ | |
1008 | ssh_gssapi_do_child(&env, &envsize); | |
1009 | #endif | |
1010 | ||
7368a6c8 | 1011 | if (!options.use_login) { |
1012 | /* Set basic environment. */ | |
61a2c1da | 1013 | for (i = 0; i < s->num_env; i++) |
f2107e97 | 1014 | child_set_env(&env, &envsize, s->env[i].name, |
61a2c1da | 1015 | s->env[i].val); |
1016 | ||
7368a6c8 | 1017 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1018 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
17ed08c5 | 1019 | #ifdef _AIX |
1020 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1021 | #endif | |
7368a6c8 | 1022 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
2e73a022 | 1023 | #ifdef HAVE_LOGIN_CAP |
97686bf9 | 1024 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1025 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1026 | else | |
1027 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1028 | #else /* HAVE_LOGIN_CAP */ |
1029 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1030 | /* |
1031 | * There's no standard path on Windows. The path contains | |
1032 | * important components pointing to the system directories, | |
1033 | * needed for loading shared libraries. So the path better | |
1034 | * remains intact here. | |
1035 | */ | |
95b99395 | 1036 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1037 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1038 | path = child_get_env(env, "PATH"); | |
1039 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1040 | if (path == NULL || *path == '\0') { | |
aff51935 | 1041 | child_set_env(&env, &envsize, "PATH", |
95b99395 | 1042 | s->pw->pw_uid == 0 ? |
1043 | SUPERUSER_PATH : _PATH_STDPATH); | |
1044 | } | |
22d89d24 | 1045 | # endif /* HAVE_CYGWIN */ |
1046 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1047 | |
1048 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1049 | _PATH_MAILDIR, pw->pw_name); | |
1050 | child_set_env(&env, &envsize, "MAIL", buf); | |
1051 | ||
1052 | /* Normal systems set SHELL by default. */ | |
1053 | child_set_env(&env, &envsize, "SHELL", shell); | |
1054 | } | |
1055 | if (getenv("TZ")) | |
1056 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1057 | ||
1058 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 1059 | if (!options.use_login) { |
1060 | while (custom_environment) { | |
1061 | struct envstring *ce = custom_environment; | |
7fdc56c5 | 1062 | char *str = ce->s; |
f7342052 | 1063 | |
7fdc56c5 | 1064 | for (i = 0; str[i] != '=' && str[i]; i++) |
2548961d | 1065 | ; |
7fdc56c5 | 1066 | if (str[i] == '=') { |
1067 | str[i] = 0; | |
1068 | child_set_env(&env, &envsize, str, str + i + 1); | |
2548961d | 1069 | } |
1070 | custom_environment = ce->next; | |
1071 | xfree(ce->s); | |
1072 | xfree(ce); | |
7368a6c8 | 1073 | } |
7368a6c8 | 1074 | } |
1075 | ||
da0561eb | 1076 | /* SSH_CLIENT deprecated */ |
7368a6c8 | 1077 | snprintf(buf, sizeof buf, "%.50s %d %d", |
f7342052 | 1078 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1079 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1080 | ||
3e2f2431 | 1081 | laddr = get_local_ipaddr(packet_get_connection_in()); |
da0561eb | 1082 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
3e2f2431 | 1083 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1084 | xfree(laddr); | |
da0561eb | 1085 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1086 | ||
56b3e9ce | 1087 | if (s->ttyfd != -1) |
1088 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1089 | if (s->term) | |
1090 | child_set_env(&env, &envsize, "TERM", s->term); | |
1091 | if (s->display) | |
1092 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1093 | if (original_command) |
1094 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1095 | original_command); | |
7368a6c8 | 1096 | |
ef51930f | 1097 | #ifdef _UNICOS |
1098 | if (cray_tmpdir[0] != '\0') | |
1099 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1100 | #endif /* _UNICOS */ | |
1101 | ||
3bfd27d5 | 1102 | /* |
1103 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1104 | * must have been set by a native authentication method (eg AIX or | |
1105 | * SIA), so copy it to the child. | |
1106 | */ | |
1107 | { | |
1108 | char *cp; | |
1109 | ||
1110 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1111 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1112 | } | |
1113 | ||
7368a6c8 | 1114 | #ifdef _AIX |
4936fcee | 1115 | { |
1116 | char *cp; | |
1117 | ||
1118 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1119 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
4936fcee | 1120 | read_environment_file(&env, &envsize, "/etc/environment"); |
1121 | } | |
7368a6c8 | 1122 | #endif |
ced49be2 | 1123 | #ifdef KRB5 |
6490a5d5 | 1124 | if (s->authctxt->krb5_ccname) |
ced49be2 | 1125 | child_set_env(&env, &envsize, "KRB5CCNAME", |
6490a5d5 | 1126 | s->authctxt->krb5_ccname); |
ced49be2 | 1127 | #endif |
7368a6c8 | 1128 | #ifdef USE_PAM |
ee48c949 | 1129 | /* |
1130 | * Pull in any environment variables that may have | |
1131 | * been set by PAM. | |
1132 | */ | |
7fceb20d | 1133 | if (options.use_pam) { |
2212fc98 | 1134 | char **p; |
b6453d99 | 1135 | |
2212fc98 | 1136 | p = fetch_pam_child_environment(); |
1137 | copy_environment(p, &env, &envsize); | |
1138 | free_pam_environment(p); | |
ee48c949 | 1139 | |
2212fc98 | 1140 | p = fetch_pam_environment(); |
ee48c949 | 1141 | copy_environment(p, &env, &envsize); |
1142 | free_pam_environment(p); | |
1143 | } | |
7368a6c8 | 1144 | #endif /* USE_PAM */ |
1145 | ||
149cdb60 | 1146 | if (auth_sock_name != NULL) |
7368a6c8 | 1147 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1148 | auth_sock_name); |
7368a6c8 | 1149 | |
1150 | /* read $HOME/.ssh/environment. */ | |
f00bab84 | 1151 | if (options.permit_user_env && !options.use_login) { |
71276795 | 1152 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e2e36358 | 1153 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
7368a6c8 | 1154 | read_environment_file(&env, &envsize, buf); |
1155 | } | |
1156 | if (debug_flag) { | |
1157 | /* dump the environment */ | |
1158 | fprintf(stderr, "Environment:\n"); | |
1159 | for (i = 0; env[i]; i++) | |
1160 | fprintf(stderr, " %.200s\n", env[i]); | |
1161 | } | |
f7342052 | 1162 | return env; |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1167 | * first in this order). | |
1168 | */ | |
1169 | static void | |
1170 | do_rc_files(Session *s, const char *shell) | |
1171 | { | |
1172 | FILE *f = NULL; | |
1173 | char cmd[1024]; | |
1174 | int do_xauth; | |
1175 | struct stat st; | |
1176 | ||
1177 | do_xauth = | |
1178 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1179 | ||
1180 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1181 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1182 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1183 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1184 | if (debug_flag) | |
1185 | fprintf(stderr, "Running %s\n", cmd); | |
1186 | f = popen(cmd, "w"); | |
1187 | if (f) { | |
1188 | if (do_xauth) | |
1189 | fprintf(f, "%s %s\n", s->auth_proto, | |
1190 | s->auth_data); | |
1191 | pclose(f); | |
1192 | } else | |
1193 | fprintf(stderr, "Could not run %s\n", | |
1194 | _PATH_SSH_USER_RC); | |
1195 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1196 | if (debug_flag) | |
1197 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1198 | _PATH_SSH_SYSTEM_RC); | |
1199 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1200 | if (f) { | |
1201 | if (do_xauth) | |
1202 | fprintf(f, "%s %s\n", s->auth_proto, | |
1203 | s->auth_data); | |
1204 | pclose(f); | |
1205 | } else | |
1206 | fprintf(stderr, "Could not run %s\n", | |
1207 | _PATH_SSH_SYSTEM_RC); | |
1208 | } else if (do_xauth && options.xauth_location != NULL) { | |
1209 | /* Add authority data to .Xauthority if appropriate. */ | |
1210 | if (debug_flag) { | |
1211 | fprintf(stderr, | |
fe661d8f | 1212 | "Running %.500s remove %.100s\n", |
2362db19 | 1213 | options.xauth_location, s->auth_display); |
fe661d8f | 1214 | fprintf(stderr, |
1215 | "%.500s add %.100s %.100s %.100s\n", | |
f7342052 | 1216 | options.xauth_location, s->auth_display, |
1217 | s->auth_proto, s->auth_data); | |
1218 | } | |
1219 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1220 | options.xauth_location); | |
1221 | f = popen(cmd, "w"); | |
1222 | if (f) { | |
fe661d8f | 1223 | fprintf(f, "remove %s\n", |
1224 | s->auth_display); | |
f7342052 | 1225 | fprintf(f, "add %s %s %s\n", |
1226 | s->auth_display, s->auth_proto, | |
1227 | s->auth_data); | |
1228 | pclose(f); | |
1229 | } else { | |
1230 | fprintf(stderr, "Could not run %s\n", | |
1231 | cmd); | |
1232 | } | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | static void | |
1237 | do_nologin(struct passwd *pw) | |
1238 | { | |
1239 | FILE *f = NULL; | |
1240 | char buf[1024]; | |
1241 | ||
1242 | #ifdef HAVE_LOGIN_CAP | |
1243 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1244 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1245 | _PATH_NOLOGIN), "r"); | |
1246 | #else | |
1247 | if (pw->pw_uid) | |
1248 | f = fopen(_PATH_NOLOGIN, "r"); | |
1249 | #endif | |
1250 | if (f) { | |
1251 | /* /etc/nologin exists. Print its contents and exit. */ | |
bbe88b6d | 1252 | logit("User %.100s not allowed because %s exists", |
8bd4e2ae | 1253 | pw->pw_name, _PATH_NOLOGIN); |
f7342052 | 1254 | while (fgets(buf, sizeof(buf), f)) |
1255 | fputs(buf, stderr); | |
1256 | fclose(f); | |
99f4fb69 | 1257 | fflush(NULL); |
f7342052 | 1258 | exit(254); |
1259 | } | |
1260 | } | |
1261 | ||
1262 | /* Set login name, uid, gid, and groups. */ | |
1853d1ef | 1263 | void |
f7342052 | 1264 | do_setusercontext(struct passwd *pw) |
1265 | { | |
2731632a | 1266 | #ifndef HAVE_CYGWIN |
1267 | if (getuid() == 0 || geteuid() == 0) | |
f7342052 | 1268 | #endif /* HAVE_CYGWIN */ |
2731632a | 1269 | { |
1270 | ||
8bbfc882 | 1271 | #ifdef HAVE_SETPCRED |
166baacc | 1272 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1273 | fatal("Failed to set process credentials"); | |
8bbfc882 | 1274 | #endif /* HAVE_SETPCRED */ |
f7342052 | 1275 | #ifdef HAVE_LOGIN_CAP |
2d199535 | 1276 | # ifdef __bsdi__ |
8695f9f7 | 1277 | setpgid(0, 0); |
2d199535 | 1278 | # endif |
09d7ebd1 | 1279 | #ifdef GSSAPI |
1280 | if (options.gss_authentication) { | |
1281 | temporarily_use_uid(pw); | |
1282 | ssh_gssapi_storecreds(); | |
1283 | restore_uid(); | |
1284 | } | |
1285 | #endif | |
f4eaee12 | 1286 | # ifdef USE_PAM |
1287 | if (options.use_pam) { | |
1288 | do_pam_session(); | |
1289 | do_pam_setcred(0); | |
1290 | } | |
1291 | # endif /* USE_PAM */ | |
f7342052 | 1292 | if (setusercontext(lc, pw, pw->pw_uid, |
1293 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1294 | perror("unable to set user context"); | |
1295 | exit(1); | |
1296 | } | |
1297 | #else | |
1298 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1299 | /* Sets login uid for accounting */ | |
1300 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1301 | error("setluid: %s", strerror(errno)); | |
1302 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1303 | ||
1304 | if (setlogin(pw->pw_name) < 0) | |
1305 | error("setlogin failed: %s", strerror(errno)); | |
1306 | if (setgid(pw->pw_gid) < 0) { | |
1307 | perror("setgid"); | |
1308 | exit(1); | |
1309 | } | |
1310 | /* Initialize the group list. */ | |
1311 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1312 | perror("initgroups"); | |
1313 | exit(1); | |
1314 | } | |
1315 | endgrent(); | |
09d7ebd1 | 1316 | #ifdef GSSAPI |
1317 | if (options.gss_authentication) { | |
1318 | temporarily_use_uid(pw); | |
1319 | ssh_gssapi_storecreds(); | |
1320 | restore_uid(); | |
1321 | } | |
1322 | #endif | |
f7342052 | 1323 | # ifdef USE_PAM |
1324 | /* | |
aff51935 | 1325 | * PAM credentials may take the form of supplementary groups. |
f7342052 | 1326 | * These will have been wiped by the above initgroups() call. |
1327 | * Reestablish them here. | |
1328 | */ | |
49e82bb9 | 1329 | if (options.use_pam) { |
1330 | do_pam_session(); | |
7fceb20d | 1331 | do_pam_setcred(0); |
49e82bb9 | 1332 | } |
f7342052 | 1333 | # endif /* USE_PAM */ |
1334 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1335 | irix_setusercontext(pw); | |
1336 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
e2bc41f9 | 1337 | # ifdef _AIX |
0ba40daa | 1338 | aix_usrinfo(pw); |
e2bc41f9 | 1339 | # endif /* _AIX */ |
26d07095 | 1340 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
4c653d8e | 1341 | if (set_id(pw->pw_name) != 0) { |
1342 | exit(1); | |
1343 | } | |
26d07095 | 1344 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ |
f7342052 | 1345 | /* Permanently switch to the desired uid. */ |
1346 | permanently_set_uid(pw); | |
1347 | #endif | |
1348 | } | |
2731632a | 1349 | |
1350 | #ifdef HAVE_CYGWIN | |
1351 | if (is_winnt) | |
1352 | #endif | |
f7342052 | 1353 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1354 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1355 | } | |
1356 | ||
37656beb | 1357 | static void |
1358 | do_pwchange(Session *s) | |
1359 | { | |
be2ca0c9 | 1360 | fflush(NULL); |
37656beb | 1361 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1362 | if (s->ttyfd != -1) { | |
f2107e97 | 1363 | fprintf(stderr, |
37656beb | 1364 | "You must change your password now and login again!\n"); |
3ade3b57 | 1365 | #ifdef PASSWD_NEEDS_USERNAME |
1366 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1367 | (char *)NULL); | |
1368 | #else | |
37656beb | 1369 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
3ade3b57 | 1370 | #endif |
37656beb | 1371 | perror("passwd"); |
1372 | } else { | |
1373 | fprintf(stderr, | |
1374 | "Password change required but no TTY available.\n"); | |
1375 | } | |
1376 | exit(1); | |
1377 | } | |
1378 | ||
51aeb639 | 1379 | static void |
1853d1ef | 1380 | launch_login(struct passwd *pw, const char *hostname) |
1381 | { | |
1382 | /* Launch login(1). */ | |
1383 | ||
85cc9118 | 1384 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1385 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1386 | (s->term ? s->term : "unknown"), |
1853d1ef | 1387 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1388 | #ifdef LOGIN_NO_ENDOPT |
1389 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1390 | #else | |
1853d1ef | 1391 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1392 | #endif |
1853d1ef | 1393 | |
1394 | /* Login couldn't be executed, die. */ | |
1395 | ||
1396 | perror("login"); | |
1397 | exit(1); | |
1398 | } | |
1399 | ||
37656beb | 1400 | static void |
1401 | child_close_fds(void) | |
1402 | { | |
1403 | int i; | |
1404 | ||
1405 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1406 | close(packet_get_connection_in()); | |
1407 | else { | |
1408 | close(packet_get_connection_in()); | |
1409 | close(packet_get_connection_out()); | |
1410 | } | |
1411 | /* | |
1412 | * Close all descriptors related to channels. They will still remain | |
1413 | * open in the parent. | |
1414 | */ | |
1415 | /* XXX better use close-on-exec? -markus */ | |
1416 | channel_close_all(); | |
1417 | ||
1418 | /* | |
1419 | * Close any extra file descriptors. Note that there may still be | |
1420 | * descriptors left by system functions. They will be closed later. | |
1421 | */ | |
1422 | endpwent(); | |
1423 | ||
1424 | /* | |
7b9b0103 | 1425 | * Close any extra open file descriptors so that we don't have them |
37656beb | 1426 | * hanging around in clients. Note that we want to do this after |
1427 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1428 | * descriptors open. | |
1429 | */ | |
1430 | for (i = 3; i < 64; i++) | |
1431 | close(i); | |
1432 | } | |
1433 | ||
f7342052 | 1434 | /* |
1435 | * Performs common processing for the child, such as setting up the | |
1436 | * environment, closing extra file descriptors, setting the user and group | |
1437 | * ids, and executing the command or shell. | |
1438 | */ | |
1439 | void | |
1440 | do_child(Session *s, const char *command) | |
1441 | { | |
1442 | extern char **environ; | |
1443 | char **env; | |
1444 | char *argv[10]; | |
1445 | const char *shell, *shell0, *hostname = NULL; | |
1446 | struct passwd *pw = s->pw; | |
f7342052 | 1447 | |
1448 | /* remove hostkey from the child's memory */ | |
1449 | destroy_sensitive_data(); | |
1450 | ||
37656beb | 1451 | /* Force a password change */ |
1452 | if (s->authctxt->force_pwchange) { | |
1453 | do_setusercontext(pw); | |
1454 | child_close_fds(); | |
1455 | do_pwchange(s); | |
1456 | exit(1); | |
1457 | } | |
1458 | ||
f7342052 | 1459 | /* login(1) is only called if we execute the login shell */ |
1460 | if (options.use_login && command != NULL) | |
1461 | options.use_login = 0; | |
1462 | ||
ef51930f | 1463 | #ifdef _UNICOS |
1464 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1465 | #endif /* _UNICOS */ | |
1466 | ||
f7342052 | 1467 | /* |
1468 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1469 | * switch, so we let login(1) to this for us. | |
1470 | */ | |
1471 | if (!options.use_login) { | |
1472 | #ifdef HAVE_OSF_SIA | |
58d0df4e | 1473 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
f7342052 | 1474 | if (!check_quietlogin(s, command)) |
1475 | do_motd(); | |
1476 | #else /* HAVE_OSF_SIA */ | |
0a61a240 | 1477 | /* When PAM is enabled we rely on it to do the nologin check */ |
1478 | if (!options.use_pam) | |
1479 | do_nologin(pw); | |
f7342052 | 1480 | do_setusercontext(pw); |
25bfd4ff | 1481 | /* |
1482 | * PAM session modules in do_setusercontext may have | |
1483 | * generated messages, so if this in an interactive | |
1484 | * login then display them too. | |
1485 | */ | |
d0c890ac | 1486 | if (!check_quietlogin(s, command)) |
25bfd4ff | 1487 | display_loginmsg(); |
f7342052 | 1488 | #endif /* HAVE_OSF_SIA */ |
1489 | } | |
1490 | ||
abdec250 | 1491 | #ifdef USE_PAM |
d9720710 | 1492 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1493 | debug3("PAM session not opened, exiting"); | |
abdec250 | 1494 | display_loginmsg(); |
1495 | exit(254); | |
1496 | } | |
1497 | #endif | |
1498 | ||
f7342052 | 1499 | /* |
1500 | * Get the shell from the password data. An empty shell field is | |
1501 | * legal, and means /bin/sh. | |
1502 | */ | |
1503 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
32214c88 | 1504 | |
1505 | /* | |
1506 | * Make sure $SHELL points to the shell from the password file, | |
1507 | * even if shell is overridden from login.conf | |
1508 | */ | |
1509 | env = do_setup_env(s, shell); | |
1510 | ||
f7342052 | 1511 | #ifdef HAVE_LOGIN_CAP |
1512 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1513 | #endif | |
1514 | ||
2e73a022 | 1515 | /* we have to stash the hostname before we close our socket. */ |
1516 | if (options.use_login) | |
46e3af7f | 1517 | hostname = get_remote_name_or_ip(utmp_len, |
c5a7d788 | 1518 | options.use_dns); |
7368a6c8 | 1519 | /* |
1520 | * Close the connection descriptors; note that this is the child, and | |
1521 | * the server will still have the socket open, and it is important | |
1522 | * that we do not shutdown it. Note that the descriptors cannot be | |
1523 | * closed before building the environment, as we call | |
1524 | * get_remote_ipaddr there. | |
1525 | */ | |
37656beb | 1526 | child_close_fds(); |
7368a6c8 | 1527 | |
7368a6c8 | 1528 | /* |
2a8a6488 | 1529 | * Must take new environment into use so that .ssh/rc, |
1530 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1531 | */ |
1532 | environ = env; | |
1533 | ||
bcfcc5f9 | 1534 | #if defined(KRB5) && defined(USE_AFS) |
a1e30b47 | 1535 | /* |
1536 | * At this point, we check to see if AFS is active and if we have | |
1537 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1538 | * if we can (and need to) extend the ticket into an AFS token. If | |
1539 | * we don't do this, we run into potential problems if the user's | |
1540 | * home directory is in AFS and it's not world-readable. | |
1541 | */ | |
1542 | ||
1543 | if (options.kerberos_get_afs_token && k_hasafs() && | |
4e2e5cfd | 1544 | (s->authctxt->krb5_ctx != NULL)) { |
a1e30b47 | 1545 | char cell[64]; |
1546 | ||
1547 | debug("Getting AFS token"); | |
1548 | ||
1549 | k_setpag(); | |
1550 | ||
1551 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1552 | krb5_afslog(s->authctxt->krb5_ctx, | |
1553 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1554 | ||
1555 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1556 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1557 | } | |
1558 | #endif | |
1559 | ||
7b9b0103 | 1560 | /* Change current directory to the user's home directory. */ |
dab89049 | 1561 | if (chdir(pw->pw_dir) < 0) { |
1562 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1563 | pw->pw_dir, strerror(errno)); | |
1564 | #ifdef HAVE_LOGIN_CAP | |
1565 | if (login_getcapbool(lc, "requirehome", 0)) | |
1566 | exit(1); | |
1567 | #endif | |
1568 | } | |
1569 | ||
f7342052 | 1570 | if (!options.use_login) |
1571 | do_rc_files(s, shell); | |
1d3c30db | 1572 | |
1573 | /* restore SIGPIPE for child */ | |
1574 | signal(SIGPIPE, SIG_DFL); | |
1575 | ||
f7342052 | 1576 | if (options.use_login) { |
1853d1ef | 1577 | launch_login(pw, hostname); |
1578 | /* NEVERREACHED */ | |
f7342052 | 1579 | } |
1580 | ||
1581 | /* Get the last component of the shell name. */ | |
1582 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1583 | shell0++; | |
1584 | else | |
1585 | shell0 = shell; | |
1586 | ||
7368a6c8 | 1587 | /* |
1588 | * If we have no command, execute the shell. In this case, the shell | |
1589 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1590 | * this is a login shell. | |
1591 | */ | |
1592 | if (!command) { | |
f7342052 | 1593 | char argv0[256]; |
7368a6c8 | 1594 | |
f7342052 | 1595 | /* Start the shell. Set initial character to '-'. */ |
1596 | argv0[0] = '-'; | |
7368a6c8 | 1597 | |
f7342052 | 1598 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1599 | >= sizeof(argv0) - 1) { | |
1600 | errno = EINVAL; | |
7368a6c8 | 1601 | perror(shell); |
1602 | exit(1); | |
f7342052 | 1603 | } |
7368a6c8 | 1604 | |
f7342052 | 1605 | /* Execute the shell. */ |
1606 | argv[0] = argv0; | |
1607 | argv[1] = NULL; | |
1608 | execve(shell, argv, env); | |
7368a6c8 | 1609 | |
f7342052 | 1610 | /* Executing the shell failed. */ |
1611 | perror(shell); | |
1612 | exit(1); | |
7368a6c8 | 1613 | } |
1614 | /* | |
1615 | * Execute the command using the user's shell. This uses the -c | |
1616 | * option to execute the command. | |
1617 | */ | |
f7342052 | 1618 | argv[0] = (char *) shell0; |
7368a6c8 | 1619 | argv[1] = "-c"; |
1620 | argv[2] = (char *) command; | |
1621 | argv[3] = NULL; | |
1622 | execve(shell, argv, env); | |
1623 | perror(shell); | |
1624 | exit(1); | |
1625 | } | |
1626 | ||
1627 | Session * | |
1628 | session_new(void) | |
1629 | { | |
1630 | int i; | |
1631 | static int did_init = 0; | |
1632 | if (!did_init) { | |
1633 | debug("session_new: init"); | |
184eed6a | 1634 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1635 | sessions[i].used = 0; |
7368a6c8 | 1636 | } |
1637 | did_init = 1; | |
1638 | } | |
184eed6a | 1639 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1640 | Session *s = &sessions[i]; |
1641 | if (! s->used) { | |
690d0d7f | 1642 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1643 | s->chanid = -1; |
1644 | s->ptyfd = -1; | |
1645 | s->ttyfd = -1; | |
7368a6c8 | 1646 | s->used = 1; |
86066315 | 1647 | s->self = i; |
d08341e6 | 1648 | s->x11_chanids = NULL; |
02323c45 | 1649 | debug("session_new: session %d", i); |
7368a6c8 | 1650 | return s; |
1651 | } | |
1652 | } | |
1653 | return NULL; | |
1654 | } | |
1655 | ||
396c147e | 1656 | static void |
7368a6c8 | 1657 | session_dump(void) |
1658 | { | |
1659 | int i; | |
184eed6a | 1660 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1661 | Session *s = &sessions[i]; |
c457707e | 1662 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1663 | s->used, |
1664 | s->self, | |
1665 | s, | |
1666 | s->chanid, | |
c457707e | 1667 | (long)s->pid); |
7368a6c8 | 1668 | } |
1669 | } | |
1670 | ||
e78a59f5 | 1671 | int |
57156994 | 1672 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1673 | { |
1674 | Session *s = session_new(); | |
1675 | debug("session_open: channel %d", chanid); | |
1676 | if (s == NULL) { | |
1677 | error("no more sessions"); | |
1678 | return 0; | |
1679 | } | |
57156994 | 1680 | s->authctxt = authctxt; |
1681 | s->pw = authctxt->pw; | |
fdaef11e | 1682 | if (s->pw == NULL || !authctxt->valid) |
0725ea77 | 1683 | fatal("no user for session %d", s->self); |
0b242b12 | 1684 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1685 | s->chanid = chanid; | |
e78a59f5 | 1686 | return 1; |
1687 | } | |
1688 | ||
1853d1ef | 1689 | Session * |
1690 | session_by_tty(char *tty) | |
1691 | { | |
1692 | int i; | |
1693 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1694 | Session *s = &sessions[i]; | |
1695 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1696 | debug("session_by_tty: session %d tty %s", i, tty); | |
1697 | return s; | |
1698 | } | |
1699 | } | |
1700 | debug("session_by_tty: unknown tty %.100s", tty); | |
1701 | session_dump(); | |
1702 | return NULL; | |
1703 | } | |
1704 | ||
396c147e | 1705 | static Session * |
e78a59f5 | 1706 | session_by_channel(int id) |
1707 | { | |
1708 | int i; | |
184eed6a | 1709 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1710 | Session *s = &sessions[i]; |
1711 | if (s->used && s->chanid == id) { | |
1712 | debug("session_by_channel: session %d channel %d", i, id); | |
1713 | return s; | |
1714 | } | |
1715 | } | |
1716 | debug("session_by_channel: unknown channel %d", id); | |
1717 | session_dump(); | |
1718 | return NULL; | |
1719 | } | |
1720 | ||
d08341e6 | 1721 | static Session * |
1722 | session_by_x11_channel(int id) | |
1723 | { | |
1724 | int i, j; | |
1725 | ||
1726 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1727 | Session *s = &sessions[i]; | |
1728 | ||
1729 | if (s->x11_chanids == NULL || !s->used) | |
1730 | continue; | |
1731 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
1732 | if (s->x11_chanids[j] == id) { | |
1733 | debug("session_by_x11_channel: session %d " | |
1734 | "channel %d", s->self, id); | |
1735 | return s; | |
1736 | } | |
1737 | } | |
1738 | } | |
1739 | debug("session_by_x11_channel: unknown channel %d", id); | |
1740 | session_dump(); | |
1741 | return NULL; | |
1742 | } | |
1743 | ||
396c147e | 1744 | static Session * |
e78a59f5 | 1745 | session_by_pid(pid_t pid) |
1746 | { | |
1747 | int i; | |
c457707e | 1748 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1749 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1750 | Session *s = &sessions[i]; |
1751 | if (s->used && s->pid == pid) | |
1752 | return s; | |
1753 | } | |
c457707e | 1754 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1755 | session_dump(); |
1756 | return NULL; | |
1757 | } | |
1758 | ||
396c147e | 1759 | static int |
e78a59f5 | 1760 | session_window_change_req(Session *s) |
1761 | { | |
1762 | s->col = packet_get_int(); | |
1763 | s->row = packet_get_int(); | |
1764 | s->xpixel = packet_get_int(); | |
1765 | s->ypixel = packet_get_int(); | |
95500969 | 1766 | packet_check_eom(); |
e78a59f5 | 1767 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1768 | return 1; | |
1769 | } | |
1770 | ||
396c147e | 1771 | static int |
e78a59f5 | 1772 | session_pty_req(Session *s) |
1773 | { | |
1e3b8b07 | 1774 | u_int len; |
30dcc918 | 1775 | int n_bytes; |
762715ce | 1776 | |
653d5f86 | 1777 | if (no_pty_flag) { |
1778 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1779 | return 0; |
653d5f86 | 1780 | } |
1781 | if (s->ttyfd != -1) { | |
1782 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1783 | return 0; |
653d5f86 | 1784 | } |
1785 | ||
e78a59f5 | 1786 | s->term = packet_get_string(&len); |
653d5f86 | 1787 | |
1788 | if (compat20) { | |
1789 | s->col = packet_get_int(); | |
1790 | s->row = packet_get_int(); | |
1791 | } else { | |
1792 | s->row = packet_get_int(); | |
1793 | s->col = packet_get_int(); | |
1794 | } | |
e78a59f5 | 1795 | s->xpixel = packet_get_int(); |
1796 | s->ypixel = packet_get_int(); | |
1797 | ||
1798 | if (strcmp(s->term, "") == 0) { | |
1799 | xfree(s->term); | |
1800 | s->term = NULL; | |
1801 | } | |
653d5f86 | 1802 | |
e78a59f5 | 1803 | /* Allocate a pty and open it. */ |
653d5f86 | 1804 | debug("Allocating pty."); |
1853d1ef | 1805 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1806 | if (s->term) |
1807 | xfree(s->term); | |
e78a59f5 | 1808 | s->term = NULL; |
1809 | s->ptyfd = -1; | |
1810 | s->ttyfd = -1; | |
1811 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1812 | return 0; |
e78a59f5 | 1813 | } |
1814 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1815 | |
1816 | /* for SSH1 the tty modes length is not given */ | |
1817 | if (!compat20) | |
1818 | n_bytes = packet_remaining(); | |
1819 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1820 | ||
1853d1ef | 1821 | if (!use_privsep) |
1822 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1823 | |
1824 | /* Set window size from the packet. */ | |
e78a59f5 | 1825 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1826 | ||
95500969 | 1827 | packet_check_eom(); |
1d1ffb87 | 1828 | session_proctitle(s); |
e78a59f5 | 1829 | return 1; |
1830 | } | |
1831 | ||
396c147e | 1832 | static int |
0b242b12 | 1833 | session_subsystem_req(Session *s) |
1834 | { | |
01855277 | 1835 | struct stat st; |
1e3b8b07 | 1836 | u_int len; |
0b242b12 | 1837 | int success = 0; |
01855277 | 1838 | char *cmd, *subsys = packet_get_string(&len); |
2ceb8101 | 1839 | u_int i; |
0b242b12 | 1840 | |
95500969 | 1841 | packet_check_eom(); |
bbe88b6d | 1842 | logit("subsystem request for %.100s", subsys); |
0b242b12 | 1843 | |
38c295d6 | 1844 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1845 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
1846 | cmd = options.subsystem_command[i]; | |
1847 | if (stat(cmd, &st) < 0) { | |
1848 | error("subsystem: cannot stat %s: %s", cmd, | |
1849 | strerror(errno)); | |
1850 | break; | |
1851 | } | |
1852 | debug("subsystem: exec() %s", cmd); | |
e5d7a405 | 1853 | s->is_subsystem = 1; |
01855277 | 1854 | do_exec(s, cmd); |
38c295d6 | 1855 | success = 1; |
24932ee9 | 1856 | break; |
38c295d6 | 1857 | } |
1858 | } | |
1859 | ||
1860 | if (!success) | |
bbe88b6d | 1861 | logit("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1862 | subsys); |
38c295d6 | 1863 | |
0b242b12 | 1864 | xfree(subsys); |
1865 | return success; | |
1866 | } | |
1867 | ||
396c147e | 1868 | static int |
0b242b12 | 1869 | session_x11_req(Session *s) |
1870 | { | |
8dcd9d5c | 1871 | int success; |
0b242b12 | 1872 | |
d08341e6 | 1873 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
1874 | error("session_x11_req: session %d: " | |
8918b906 | 1875 | "x11 forwarding already active", s->self); |
d08341e6 | 1876 | return 0; |
1877 | } | |
0b242b12 | 1878 | s->single_connection = packet_get_char(); |
1879 | s->auth_proto = packet_get_string(NULL); | |
1880 | s->auth_data = packet_get_string(NULL); | |
1881 | s->screen = packet_get_int(); | |
95500969 | 1882 | packet_check_eom(); |
0b242b12 | 1883 | |
8dcd9d5c | 1884 | success = session_setup_x11fwd(s); |
1885 | if (!success) { | |
0b242b12 | 1886 | xfree(s->auth_proto); |
1887 | xfree(s->auth_data); | |
1500bcdd | 1888 | s->auth_proto = NULL; |
1889 | s->auth_data = NULL; | |
0b242b12 | 1890 | } |
8dcd9d5c | 1891 | return success; |
0b242b12 | 1892 | } |
1893 | ||
396c147e | 1894 | static int |
38c295d6 | 1895 | session_shell_req(Session *s) |
1896 | { | |
95500969 | 1897 | packet_check_eom(); |
dac6753b | 1898 | do_exec(s, NULL); |
38c295d6 | 1899 | return 1; |
1900 | } | |
1901 | ||
396c147e | 1902 | static int |
38c295d6 | 1903 | session_exec_req(Session *s) |
1904 | { | |
1e3b8b07 | 1905 | u_int len; |
38c295d6 | 1906 | char *command = packet_get_string(&len); |
95500969 | 1907 | packet_check_eom(); |
dac6753b | 1908 | do_exec(s, command); |
c95add71 | 1909 | xfree(command); |
38c295d6 | 1910 | return 1; |
1911 | } | |
1912 | ||
16a79097 | 1913 | static int |
1914 | session_break_req(Session *s) | |
1915 | { | |
16a79097 | 1916 | |
f6be21a0 | 1917 | packet_get_int(); /* ignored */ |
16a79097 | 1918 | packet_check_eom(); |
1919 | ||
8168a86a | 1920 | if (s->ttyfd == -1 || |
1921 | tcsendbreak(s->ttyfd, 0) < 0) | |
16a79097 | 1922 | return 0; |
16a79097 | 1923 | return 1; |
1924 | } | |
1925 | ||
61a2c1da | 1926 | static int |
1927 | session_env_req(Session *s) | |
1928 | { | |
1929 | char *name, *val; | |
1930 | u_int name_len, val_len, i; | |
1931 | ||
1932 | name = packet_get_string(&name_len); | |
1933 | val = packet_get_string(&val_len); | |
1934 | packet_check_eom(); | |
1935 | ||
1936 | /* Don't set too many environment variables */ | |
1937 | if (s->num_env > 128) { | |
1938 | debug2("Ignoring env request %s: too many env vars", name); | |
1939 | goto fail; | |
1940 | } | |
1941 | ||
1942 | for (i = 0; i < options.num_accept_env; i++) { | |
1943 | if (match_pattern(name, options.accept_env[i])) { | |
1944 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
1945 | s->env = xrealloc(s->env, sizeof(*s->env) * | |
1946 | (s->num_env + 1)); | |
1947 | s->env[s->num_env].name = name; | |
1948 | s->env[s->num_env].val = val; | |
1949 | s->num_env++; | |
1950 | return (1); | |
1951 | } | |
1952 | } | |
1953 | debug2("Ignoring env request %s: disallowed name", name); | |
1954 | ||
1955 | fail: | |
1956 | xfree(name); | |
1957 | xfree(val); | |
1958 | return (0); | |
1959 | } | |
1960 | ||
396c147e | 1961 | static int |
fa08c86b | 1962 | session_auth_agent_req(Session *s) |
1963 | { | |
1964 | static int called = 0; | |
95500969 | 1965 | packet_check_eom(); |
d343d900 | 1966 | if (no_agent_forwarding_flag) { |
1967 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1968 | return 0; | |
1969 | } | |
fa08c86b | 1970 | if (called) { |
1971 | return 0; | |
1972 | } else { | |
1973 | called = 1; | |
1974 | return auth_input_request_forwarding(s->pw); | |
1975 | } | |
1976 | } | |
1977 | ||
7899c98f | 1978 | int |
1979 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 1980 | { |
e78a59f5 | 1981 | int success = 0; |
e78a59f5 | 1982 | Session *s; |
e78a59f5 | 1983 | |
7899c98f | 1984 | if ((s = session_by_channel(c->self)) == NULL) { |
bbe88b6d | 1985 | logit("session_input_channel_req: no session %d req %.100s", |
7899c98f | 1986 | c->self, rtype); |
1987 | return 0; | |
1988 | } | |
1989 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 1990 | |
1991 | /* | |
e5d7a405 | 1992 | * a session is in LARVAL state until a shell, a command |
1993 | * or a subsystem is executed | |
e78a59f5 | 1994 | */ |
1995 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1996 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1997 | success = session_shell_req(s); |
e78a59f5 | 1998 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1999 | success = session_exec_req(s); |
e78a59f5 | 2000 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 2001 | success = session_pty_req(s); |
0b242b12 | 2002 | } else if (strcmp(rtype, "x11-req") == 0) { |
2003 | success = session_x11_req(s); | |
fa08c86b | 2004 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
2005 | success = session_auth_agent_req(s); | |
0b242b12 | 2006 | } else if (strcmp(rtype, "subsystem") == 0) { |
2007 | success = session_subsystem_req(s); | |
61a2c1da | 2008 | } else if (strcmp(rtype, "env") == 0) { |
2009 | success = session_env_req(s); | |
e78a59f5 | 2010 | } |
2011 | } | |
2012 | if (strcmp(rtype, "window-change") == 0) { | |
2013 | success = session_window_change_req(s); | |
c6c76c99 | 2014 | } else if (strcmp(rtype, "break") == 0) { |
2015 | success = session_break_req(s); | |
e78a59f5 | 2016 | } |
c6c76c99 | 2017 | |
7899c98f | 2018 | return success; |
e78a59f5 | 2019 | } |
2020 | ||
2021 | void | |
2022 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2023 | { | |
2024 | if (!compat20) | |
2025 | fatal("session_set_fds: called for proto != 2.0"); | |
2026 | /* | |
2027 | * now that have a child and a pipe to the child, | |
2028 | * we can activate our channel and register the fd's | |
2029 | */ | |
2030 | if (s->chanid == -1) | |
2031 | fatal("no channel for session %d", s->self); | |
2032 | channel_set_fds(s->chanid, | |
2033 | fdout, fdin, fderr, | |
a22aff1f | 2034 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 2035 | 1, |
2036 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 2037 | } |
2038 | ||
86066315 | 2039 | /* |
2040 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2041 | * (e.g., due to a dropped connection). | |
2042 | */ | |
1853d1ef | 2043 | void |
2362db19 | 2044 | session_pty_cleanup2(Session *s) |
7368a6c8 | 2045 | { |
86066315 | 2046 | if (s == NULL) { |
2047 | error("session_pty_cleanup: no session"); | |
2048 | return; | |
2049 | } | |
2050 | if (s->ttyfd == -1) | |
7368a6c8 | 2051 | return; |
2052 | ||
0725ea77 | 2053 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 2054 | |
7368a6c8 | 2055 | /* Record that the user has logged out. */ |
86066315 | 2056 | if (s->pid != 0) |
f3837bc6 | 2057 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 2058 | |
2059 | /* Release the pseudo-tty. */ | |
1853d1ef | 2060 | if (getuid() == 0) |
2061 | pty_release(s->tty); | |
7368a6c8 | 2062 | |
2063 | /* | |
2064 | * Close the server side of the socket pairs. We must do this after | |
2065 | * the pty cleanup, so that another process doesn't get this pty | |
2066 | * while we're still cleaning up. | |
2067 | */ | |
2068 | if (close(s->ptymaster) < 0) | |
1853d1ef | 2069 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 2070 | |
2071 | /* unlink pty from session */ | |
2072 | s->ttyfd = -1; | |
7368a6c8 | 2073 | } |
e78a59f5 | 2074 | |
1853d1ef | 2075 | void |
2362db19 | 2076 | session_pty_cleanup(Session *s) |
1853d1ef | 2077 | { |
2362db19 | 2078 | PRIVSEP(session_pty_cleanup2(s)); |
1853d1ef | 2079 | } |
2080 | ||
6c723e7c | 2081 | static char * |
2082 | sig2name(int sig) | |
2083 | { | |
2084 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2085 | SSH_SIG(ABRT); | |
2086 | SSH_SIG(ALRM); | |
2087 | SSH_SIG(FPE); | |
2088 | SSH_SIG(HUP); | |
2089 | SSH_SIG(ILL); | |
2090 | SSH_SIG(INT); | |
2091 | SSH_SIG(KILL); | |
2092 | SSH_SIG(PIPE); | |
2093 | SSH_SIG(QUIT); | |
2094 | SSH_SIG(SEGV); | |
2095 | SSH_SIG(TERM); | |
2096 | SSH_SIG(USR1); | |
2097 | SSH_SIG(USR2); | |
2098 | #undef SSH_SIG | |
2099 | return "SIG@openssh.com"; | |
2100 | } | |
2101 | ||
d08341e6 | 2102 | static void |
2103 | session_close_x11(int id) | |
2104 | { | |
2105 | Channel *c; | |
2106 | ||
b872f7f0 | 2107 | if ((c = channel_by_id(id)) == NULL) { |
d08341e6 | 2108 | debug("session_close_x11: x11 channel %d missing", id); |
2109 | } else { | |
2110 | /* Detach X11 listener */ | |
2111 | debug("session_close_x11: detach x11 channel %d", id); | |
2112 | channel_cancel_cleanup(id); | |
2113 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2114 | chan_mark_dead(c); | |
2115 | } | |
2116 | } | |
2117 | ||
2118 | static void | |
2119 | session_close_single_x11(int id, void *arg) | |
2120 | { | |
2121 | Session *s; | |
2122 | u_int i; | |
2123 | ||
2124 | debug3("session_close_single_x11: channel %d", id); | |
2125 | channel_cancel_cleanup(id); | |
2126 | if ((s = session_by_x11_channel(id)) == NULL) | |
2127 | fatal("session_close_single_x11: no x11 channel %d", id); | |
2128 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2129 | debug("session_close_single_x11: session %d: " | |
2130 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2131 | /* | |
2132 | * The channel "id" is already closing, but make sure we | |
2133 | * close all of its siblings. | |
2134 | */ | |
2135 | if (s->x11_chanids[i] != id) | |
2136 | session_close_x11(s->x11_chanids[i]); | |
2137 | } | |
2138 | xfree(s->x11_chanids); | |
2139 | s->x11_chanids = NULL; | |
2140 | if (s->display) { | |
2141 | xfree(s->display); | |
2142 | s->display = NULL; | |
2143 | } | |
2144 | if (s->auth_proto) { | |
2145 | xfree(s->auth_proto); | |
2146 | s->auth_proto = NULL; | |
2147 | } | |
2148 | if (s->auth_data) { | |
2149 | xfree(s->auth_data); | |
2150 | s->auth_data = NULL; | |
2151 | } | |
2152 | if (s->auth_display) { | |
2153 | xfree(s->auth_display); | |
2154 | s->auth_display = NULL; | |
2155 | } | |
2156 | } | |
2157 | ||
396c147e | 2158 | static void |
e78a59f5 | 2159 | session_exit_message(Session *s, int status) |
2160 | { | |
2161 | Channel *c; | |
5a4ae906 | 2162 | |
2163 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 2164 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 2165 | s->self, s->chanid); |
c457707e | 2166 | debug("session_exit_message: session %d channel %d pid %ld", |
2167 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 2168 | |
2169 | if (WIFEXITED(status)) { | |
5a4ae906 | 2170 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 2171 | packet_put_int(WEXITSTATUS(status)); |
2172 | packet_send(); | |
2173 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 2174 | channel_request_start(s->chanid, "exit-signal", 0); |
6c723e7c | 2175 | packet_put_cstring(sig2name(WTERMSIG(status))); |
a64009ad | 2176 | #ifdef WCOREDUMP |
e78a59f5 | 2177 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 2178 | #else /* WCOREDUMP */ |
2179 | packet_put_char(0); | |
2180 | #endif /* WCOREDUMP */ | |
e78a59f5 | 2181 | packet_put_cstring(""); |
2182 | packet_put_cstring(""); | |
2183 | packet_send(); | |
2184 | } else { | |
2185 | /* Some weird exit cause. Just exit. */ | |
2186 | packet_disconnect("wait returned status %04x.", status); | |
2187 | } | |
2188 | ||
2189 | /* disconnect channel */ | |
2190 | debug("session_exit_message: release channel %d", s->chanid); | |
8cd0437d | 2191 | |
2192 | /* | |
2193 | * Adjust cleanup callback attachment to send close messages when | |
2194 | * the channel gets EOF. The session will be then be closed | |
2195 | * by session_close_by_channel when the childs close their fds. | |
2196 | */ | |
2197 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2198 | ||
9da5c3c9 | 2199 | /* |
2200 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2201 | * interested in data we write. | |
2202 | * Note that we must not call 'chan_read_failed', since there could | |
2203 | * be some more data waiting in the pipe. | |
2204 | */ | |
0b242b12 | 2205 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
2206 | chan_write_failed(c); | |
e78a59f5 | 2207 | } |
2208 | ||
1853d1ef | 2209 | void |
86066315 | 2210 | session_close(Session *s) |
e78a59f5 | 2211 | { |
2ceb8101 | 2212 | u_int i; |
61a2c1da | 2213 | |
c457707e | 2214 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
2362db19 | 2215 | if (s->ttyfd != -1) |
86066315 | 2216 | session_pty_cleanup(s); |
e78a59f5 | 2217 | if (s->term) |
2218 | xfree(s->term); | |
2219 | if (s->display) | |
2220 | xfree(s->display); | |
d08341e6 | 2221 | if (s->x11_chanids) |
2222 | xfree(s->x11_chanids); | |
f9314d9a | 2223 | if (s->auth_display) |
2224 | xfree(s->auth_display); | |
e78a59f5 | 2225 | if (s->auth_data) |
2226 | xfree(s->auth_data); | |
2227 | if (s->auth_proto) | |
2228 | xfree(s->auth_proto); | |
2229 | s->used = 0; | |
61a2c1da | 2230 | for (i = 0; i < s->num_env; i++) { |
2231 | xfree(s->env[i].name); | |
2232 | xfree(s->env[i].val); | |
2233 | } | |
2234 | if (s->env != NULL) | |
2235 | xfree(s->env); | |
1d1ffb87 | 2236 | session_proctitle(s); |
e78a59f5 | 2237 | } |
2238 | ||
2239 | void | |
2240 | session_close_by_pid(pid_t pid, int status) | |
2241 | { | |
2242 | Session *s = session_by_pid(pid); | |
2243 | if (s == NULL) { | |
c457707e | 2244 | debug("session_close_by_pid: no session for pid %ld", |
2245 | (long)pid); | |
e78a59f5 | 2246 | return; |
2247 | } | |
2248 | if (s->chanid != -1) | |
2249 | session_exit_message(s, status); | |
8cd0437d | 2250 | if (s->ttyfd != -1) |
2251 | session_pty_cleanup(s); | |
4c721c3d | 2252 | s->pid = 0; |
e78a59f5 | 2253 | } |
2254 | ||
2255 | /* | |
2256 | * this is called when a channel dies before | |
2257 | * the session 'child' itself dies | |
2258 | */ | |
2259 | void | |
2260 | session_close_by_channel(int id, void *arg) | |
2261 | { | |
2262 | Session *s = session_by_channel(id); | |
8cd0437d | 2263 | u_int i; |
d08341e6 | 2264 | |
e78a59f5 | 2265 | if (s == NULL) { |
418e724c | 2266 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 2267 | return; |
2268 | } | |
c457707e | 2269 | debug("session_close_by_channel: channel %d child %ld", |
2270 | id, (long)s->pid); | |
d5f24f94 | 2271 | if (s->pid != 0) { |
418e724c | 2272 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 2273 | /* |
2274 | * delay detach of session, but release pty, since | |
2275 | * the fd's to the child are already closed | |
2276 | */ | |
2362db19 | 2277 | if (s->ttyfd != -1) |
efcc9957 | 2278 | session_pty_cleanup(s); |
418e724c | 2279 | return; |
e78a59f5 | 2280 | } |
418e724c | 2281 | /* detach by removing callback */ |
2282 | channel_cancel_cleanup(s->chanid); | |
8cd0437d | 2283 | |
2284 | /* Close any X11 listeners associated with this session */ | |
2285 | if (s->x11_chanids != NULL) { | |
2286 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2287 | session_close_x11(s->x11_chanids[i]); | |
2288 | s->x11_chanids[i] = -1; | |
2289 | } | |
2290 | } | |
2291 | ||
418e724c | 2292 | s->chanid = -1; |
d5f24f94 | 2293 | session_close(s); |
2294 | } | |
2295 | ||
2296 | void | |
1853d1ef | 2297 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 2298 | { |
2299 | int i; | |
184eed6a | 2300 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 2301 | Session *s = &sessions[i]; |
1853d1ef | 2302 | if (s->used) { |
2303 | if (closefunc != NULL) | |
2304 | closefunc(s); | |
2305 | else | |
2306 | session_close(s); | |
2307 | } | |
d5f24f94 | 2308 | } |
e78a59f5 | 2309 | } |
2310 | ||
396c147e | 2311 | static char * |
1d1ffb87 | 2312 | session_tty_list(void) |
2313 | { | |
2314 | static char buf[1024]; | |
2315 | int i; | |
d0104542 | 2316 | char *cp; |
2317 | ||
1d1ffb87 | 2318 | buf[0] = '\0'; |
184eed6a | 2319 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 2320 | Session *s = &sessions[i]; |
2321 | if (s->used && s->ttyfd != -1) { | |
b6453d99 | 2322 | |
d0104542 | 2323 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2324 | cp = strrchr(s->tty, '/'); | |
2325 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2326 | } else | |
2327 | cp = s->tty + 5; | |
b6453d99 | 2328 | |
1d1ffb87 | 2329 | if (buf[0] != '\0') |
2330 | strlcat(buf, ",", sizeof buf); | |
d0104542 | 2331 | strlcat(buf, cp, sizeof buf); |
1d1ffb87 | 2332 | } |
2333 | } | |
2334 | if (buf[0] == '\0') | |
2335 | strlcpy(buf, "notty", sizeof buf); | |
2336 | return buf; | |
2337 | } | |
2338 | ||
2339 | void | |
2340 | session_proctitle(Session *s) | |
2341 | { | |
2342 | if (s->pw == NULL) | |
2343 | error("no user for session %d", s->self); | |
2344 | else | |
2345 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2346 | } | |
2347 | ||
8dcd9d5c | 2348 | int |
2349 | session_setup_x11fwd(Session *s) | |
2350 | { | |
8dcd9d5c | 2351 | struct stat st; |
c9d0ad9b | 2352 | char display[512], auth_display[512]; |
2353 | char hostname[MAXHOSTNAMELEN]; | |
d08341e6 | 2354 | u_int i; |
8dcd9d5c | 2355 | |
2356 | if (no_x11_forwarding_flag) { | |
2357 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2358 | return 0; | |
2359 | } | |
2360 | if (!options.x11_forwarding) { | |
2361 | debug("X11 forwarding disabled in server configuration file."); | |
2362 | return 0; | |
2363 | } | |
2364 | if (!options.xauth_location || | |
2365 | (stat(options.xauth_location, &st) == -1)) { | |
2366 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2367 | return 0; | |
2368 | } | |
ff027d84 | 2369 | if (options.use_login) { |
2370 | packet_send_debug("X11 forwarding disabled; " | |
2371 | "not compatible with UseLogin=yes."); | |
2372 | return 0; | |
2373 | } | |
b44de2b1 | 2374 | if (s->display != NULL) { |
8dcd9d5c | 2375 | debug("X11 display already set."); |
2376 | return 0; | |
2377 | } | |
57f228e8 | 2378 | if (x11_create_display_inet(options.x11_display_offset, |
2379 | options.x11_use_localhost, s->single_connection, | |
d08341e6 | 2380 | &s->display_number, &s->x11_chanids) == -1) { |
b44de2b1 | 2381 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 2382 | return 0; |
2383 | } | |
d08341e6 | 2384 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2385 | channel_register_cleanup(s->x11_chanids[i], | |
8cd0437d | 2386 | session_close_single_x11, 0); |
d08341e6 | 2387 | } |
c9d0ad9b | 2388 | |
2389 | /* Set up a suitable value for the DISPLAY variable. */ | |
2390 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2391 | fatal("gethostname: %.100s", strerror(errno)); | |
2392 | /* | |
2393 | * auth_display must be used as the displayname when the | |
2394 | * authorization entry is added with xauth(1). This will be | |
2395 | * different than the DISPLAY string for localhost displays. | |
2396 | */ | |
e6e573bd | 2397 | if (options.x11_use_localhost) { |
57f228e8 | 2398 | snprintf(display, sizeof display, "localhost:%u.%u", |
c9d0ad9b | 2399 | s->display_number, s->screen); |
57f228e8 | 2400 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
f9314d9a | 2401 | s->display_number, s->screen); |
c9d0ad9b | 2402 | s->display = xstrdup(display); |
f9314d9a | 2403 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 2404 | } else { |
2405 | #ifdef IPADDR_IN_DISPLAY | |
2406 | struct hostent *he; | |
2407 | struct in_addr my_addr; | |
2408 | ||
2409 | he = gethostbyname(hostname); | |
2410 | if (he == NULL) { | |
2411 | error("Can't get IP address for X11 DISPLAY."); | |
2412 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2413 | return 0; | |
2414 | } | |
2415 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
57f228e8 | 2416 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
c9d0ad9b | 2417 | s->display_number, s->screen); |
2418 | #else | |
57f228e8 | 2419 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
c9d0ad9b | 2420 | s->display_number, s->screen); |
2421 | #endif | |
2422 | s->display = xstrdup(display); | |
f9314d9a | 2423 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2424 | } |
2425 | ||
8dcd9d5c | 2426 | return 1; |
2427 | } | |
2428 | ||
396c147e | 2429 | static void |
59c97189 | 2430 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2431 | { |
57156994 | 2432 | server_loop2(authctxt); |
2362db19 | 2433 | } |
2434 | ||
2435 | void | |
2436 | do_cleanup(Authctxt *authctxt) | |
2437 | { | |
2438 | static int called = 0; | |
2439 | ||
2440 | debug("do_cleanup"); | |
2441 | ||
2442 | /* no cleanup if we're in the child for login shell */ | |
2443 | if (is_child) | |
2444 | return; | |
2445 | ||
2446 | /* avoid double cleanup */ | |
2447 | if (called) | |
2448 | return; | |
2449 | called = 1; | |
2450 | ||
2451 | if (authctxt == NULL) | |
2452 | return; | |
2453 | #ifdef KRB5 | |
2454 | if (options.kerberos_ticket_cleanup && | |
2455 | authctxt->krb5_ctx) | |
2456 | krb5_cleanup_proc(authctxt); | |
7364bd04 | 2457 | #endif |
2362db19 | 2458 | |
2459 | #ifdef GSSAPI | |
2460 | if (compat20 && options.gss_cleanup_creds) | |
2461 | ssh_gssapi_cleanup_creds(); | |
2462 | #endif | |
2463 | ||
c6630044 | 2464 | #ifdef USE_PAM |
2465 | if (options.use_pam) { | |
2466 | sshpam_cleanup(); | |
2467 | sshpam_thread_cleanup(); | |
2468 | } | |
2469 | #endif | |
2470 | ||
2362db19 | 2471 | /* remove agent socket */ |
2472 | auth_sock_cleanup_proc(authctxt->pw); | |
2473 | ||
2474 | /* | |
2475 | * Cleanup ptys/utmp only if privsep is disabled, | |
2476 | * or if running in monitor. | |
2477 | */ | |
2478 | if (!use_privsep || mm_is_monitor()) | |
2479 | session_destroy_all(session_pty_cleanup2); | |
e78a59f5 | 2480 | } |