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