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16fbe330 | 1 | /* $OpenBSD: session.c,v 1.204 2006/07/02 22:45:59 stevesk Exp $ */ |
7368a6c8 | 2 | /* |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
bcbf86ec | 5 | * |
6 | * As far as I am concerned, the code I have written for this software | |
7 | * can be used freely for any purpose. Any derived versions of this | |
8 | * software must be clearly marked as such, and if the derived work is | |
9 | * incompatible with the protocol description in the RFC file, it must be | |
10 | * called by a name other than "ssh" or "Secure Shell". | |
11 | * | |
e78a59f5 | 12 | * SSH2 support by Markus Friedl. |
a96070d4 | 13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 14 | * |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * 1. Redistributions of source code must retain the above copyright | |
19 | * notice, this list of conditions and the following disclaimer. | |
20 | * 2. Redistributions in binary form must reproduce the above copyright | |
21 | * notice, this list of conditions and the following disclaimer in the | |
22 | * documentation and/or other materials provided with the distribution. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
e78a59f5 | 34 | */ |
7368a6c8 | 35 | |
36 | #include "includes.h" | |
aa2eae64 | 37 | |
38 | #include <sys/types.h> | |
4095f623 | 39 | #ifdef HAVE_SYS_STAT_H |
40 | # include <sys/stat.h> | |
41 | #endif | |
aa2eae64 | 42 | #include <sys/wait.h> |
cebb4c24 | 43 | #include <sys/un.h> |
a75f5360 | 44 | |
16fbe330 | 45 | #include <grp.h> |
b5b88c19 | 46 | #ifdef HAVE_PATHS_H |
a75f5360 | 47 | #include <paths.h> |
b5b88c19 | 48 | #endif |
ada68823 | 49 | #include <signal.h> |
319d6b41 | 50 | #include <arpa/inet.h> |
7368a6c8 | 51 | |
7368a6c8 | 52 | #include "ssh.h" |
42f11eb2 | 53 | #include "ssh1.h" |
54 | #include "ssh2.h" | |
55 | #include "xmalloc.h" | |
1729c161 | 56 | #include "sshpty.h" |
7368a6c8 | 57 | #include "packet.h" |
58 | #include "buffer.h" | |
61a2c1da | 59 | #include "match.h" |
7368a6c8 | 60 | #include "uidswap.h" |
61 | #include "compat.h" | |
a5efa1bb | 62 | #include "channels.h" |
e78a59f5 | 63 | #include "bufaux.h" |
e78a59f5 | 64 | #include "auth.h" |
38c295d6 | 65 | #include "auth-options.h" |
42f11eb2 | 66 | #include "pathnames.h" |
67 | #include "log.h" | |
68 | #include "servconf.h" | |
1729c161 | 69 | #include "sshlogin.h" |
42f11eb2 | 70 | #include "serverloop.h" |
71 | #include "canohost.h" | |
5ca51e19 | 72 | #include "session.h" |
07200973 | 73 | #include "kex.h" |
1853d1ef | 74 | #include "monitor_wrap.h" |
e78a59f5 | 75 | |
bcfcc5f9 | 76 | #if defined(KRB5) && defined(USE_AFS) |
39dfceeb | 77 | #include <kafs.h> |
78 | #endif | |
79 | ||
7364bd04 | 80 | #ifdef GSSAPI |
81 | #include "ssh-gss.h" | |
82 | #endif | |
83 | ||
7368a6c8 | 84 | /* func */ |
85 | ||
86 | Session *session_new(void); | |
9c328529 | 87 | void session_set_fds(Session *, int, int, int); |
2362db19 | 88 | void session_pty_cleanup(Session *); |
9c328529 | 89 | void session_proctitle(Session *); |
90 | int session_setup_x11fwd(Session *); | |
91 | void do_exec_pty(Session *, const char *); | |
92 | void do_exec_no_pty(Session *, const char *); | |
93 | void do_exec(Session *, const char *); | |
94 | void do_login(Session *, const char *); | |
8a9ac95d | 95 | #ifdef LOGIN_NEEDS_UTMPX |
96 | static void do_pre_login(Session *s); | |
97 | #endif | |
9c328529 | 98 | void do_child(Session *, const char *); |
f2c2fd71 | 99 | void do_motd(void); |
9c328529 | 100 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 101 | |
396c147e | 102 | static void do_authenticated1(Authctxt *); |
103 | static void do_authenticated2(Authctxt *); | |
9c328529 | 104 | |
396c147e | 105 | static int session_pty_req(Session *); |
bb5639fe | 106 | |
7368a6c8 | 107 | /* import */ |
108 | extern ServerOptions options; | |
109 | extern char *__progname; | |
110 | extern int log_stderr; | |
111 | extern int debug_flag; | |
1e3b8b07 | 112 | extern u_int utmp_len; |
089fbbd2 | 113 | extern int startup_pipe; |
e78e738a | 114 | extern void destroy_sensitive_data(void); |
bc7dfc06 | 115 | extern Buffer loginmsg; |
089fbbd2 | 116 | |
b5e300c2 | 117 | /* original command from peer. */ |
c95add71 | 118 | const char *original_command = NULL; |
b5e300c2 | 119 | |
7368a6c8 | 120 | /* data */ |
121 | #define MAX_SESSIONS 10 | |
122 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 123 | |
2e73a022 | 124 | #ifdef HAVE_LOGIN_CAP |
1836f69f | 125 | login_cap_t *lc; |
2e73a022 | 126 | #endif |
127 | ||
2362db19 | 128 | static int is_child = 0; |
129 | ||
149cdb60 | 130 | /* Name and directory of socket for authentication agent forwarding. */ |
131 | static char *auth_sock_name = NULL; | |
132 | static char *auth_sock_dir = NULL; | |
133 | ||
134 | /* removes the agent forwarding socket */ | |
135 | ||
136 | static void | |
2362db19 | 137 | auth_sock_cleanup_proc(struct passwd *pw) |
149cdb60 | 138 | { |
149cdb60 | 139 | if (auth_sock_name != NULL) { |
140 | temporarily_use_uid(pw); | |
141 | unlink(auth_sock_name); | |
142 | rmdir(auth_sock_dir); | |
143 | auth_sock_name = NULL; | |
144 | restore_uid(); | |
145 | } | |
146 | } | |
147 | ||
148 | static int | |
149 | auth_input_request_forwarding(struct passwd * pw) | |
150 | { | |
151 | Channel *nc; | |
152 | int sock; | |
153 | struct sockaddr_un sunaddr; | |
154 | ||
155 | if (auth_sock_name != NULL) { | |
156 | error("authentication forwarding requested twice."); | |
157 | return 0; | |
158 | } | |
159 | ||
160 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
161 | temporarily_use_uid(pw); | |
162 | ||
163 | /* Allocate a buffer for the socket name, and format the name. */ | |
164 | auth_sock_name = xmalloc(MAXPATHLEN); | |
165 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
c88de854 | 166 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
149cdb60 | 167 | |
168 | /* Create private directory for socket */ | |
169 | if (mkdtemp(auth_sock_dir) == NULL) { | |
170 | packet_send_debug("Agent forwarding disabled: " | |
171 | "mkdtemp() failed: %.100s", strerror(errno)); | |
172 | restore_uid(); | |
173 | xfree(auth_sock_name); | |
174 | xfree(auth_sock_dir); | |
175 | auth_sock_name = NULL; | |
176 | auth_sock_dir = NULL; | |
177 | return 0; | |
178 | } | |
c457707e | 179 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
180 | auth_sock_dir, (long) getpid()); | |
149cdb60 | 181 | |
149cdb60 | 182 | /* Create the socket. */ |
183 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
184 | if (sock < 0) | |
185 | packet_disconnect("socket: %.100s", strerror(errno)); | |
186 | ||
187 | /* Bind it to the name. */ | |
188 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
189 | sunaddr.sun_family = AF_UNIX; | |
190 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
191 | ||
32596c7b | 192 | if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) |
149cdb60 | 193 | packet_disconnect("bind: %.100s", strerror(errno)); |
194 | ||
195 | /* Restore the privileged uid. */ | |
196 | restore_uid(); | |
197 | ||
198 | /* Start listening on the socket. */ | |
fce39749 | 199 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
149cdb60 | 200 | packet_disconnect("listen: %.100s", strerror(errno)); |
201 | ||
202 | /* Allocate a channel for the authentication agent socket. */ | |
203 | nc = channel_new("auth socket", | |
204 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
205 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 206 | 0, "auth socket", 1); |
149cdb60 | 207 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
208 | return 1; | |
209 | } | |
210 | ||
dd1fb864 | 211 | static void |
212 | display_loginmsg(void) | |
213 | { | |
56964485 | 214 | if (buffer_len(&loginmsg) > 0) { |
215 | buffer_append(&loginmsg, "\0", 1); | |
216 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
217 | buffer_clear(&loginmsg); | |
218 | } | |
dd1fb864 | 219 | } |
149cdb60 | 220 | |
bb5639fe | 221 | void |
222 | do_authenticated(Authctxt *authctxt) | |
223 | { | |
381b021b | 224 | setproctitle("%s", authctxt->pw->pw_name); |
225 | ||
bb5639fe | 226 | /* setup the channel layer */ |
227 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
228 | channel_permit_all_opens(); | |
229 | ||
230 | if (compat20) | |
231 | do_authenticated2(authctxt); | |
232 | else | |
233 | do_authenticated1(authctxt); | |
e4f7282d | 234 | |
2362db19 | 235 | do_cleanup(authctxt); |
bb5639fe | 236 | } |
237 | ||
7368a6c8 | 238 | /* |
239 | * Prepares for an interactive session. This is called after the user has | |
240 | * been successfully authenticated. During this message exchange, pseudo | |
241 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
242 | * are requested, etc. | |
243 | */ | |
396c147e | 244 | static void |
bb5639fe | 245 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 246 | { |
247 | Session *s; | |
7368a6c8 | 248 | char *command; |
54a5250f | 249 | int success, type, screen_flag; |
7138ebd9 | 250 | int enable_compression_after_reply = 0; |
251 | u_int proto_len, data_len, dlen, compression_level = 0; | |
7368a6c8 | 252 | |
253 | s = session_new(); | |
b0042027 | 254 | if (s == NULL) { |
255 | error("no more sessions"); | |
256 | return; | |
257 | } | |
ced49be2 | 258 | s->authctxt = authctxt; |
bb5639fe | 259 | s->pw = authctxt->pw; |
2e73a022 | 260 | |
7368a6c8 | 261 | /* |
262 | * We stay in this loop until the client requests to execute a shell | |
263 | * or a command. | |
264 | */ | |
265 | for (;;) { | |
bb5639fe | 266 | success = 0; |
7368a6c8 | 267 | |
268 | /* Get a packet from the client. */ | |
54a5250f | 269 | type = packet_read(); |
7368a6c8 | 270 | |
271 | /* Process the packet. */ | |
272 | switch (type) { | |
273 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 274 | compression_level = packet_get_int(); |
95500969 | 275 | packet_check_eom(); |
7368a6c8 | 276 | if (compression_level < 1 || compression_level > 9) { |
d77347cc | 277 | packet_send_debug("Received invalid compression level %d.", |
184eed6a | 278 | compression_level); |
7368a6c8 | 279 | break; |
280 | } | |
07200973 | 281 | if (options.compression == COMP_NONE) { |
636f76ca | 282 | debug2("compression disabled"); |
283 | break; | |
284 | } | |
7368a6c8 | 285 | /* Enable compression after we have responded with SUCCESS. */ |
286 | enable_compression_after_reply = 1; | |
287 | success = 1; | |
288 | break; | |
289 | ||
290 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 291 | success = session_pty_req(s); |
7368a6c8 | 292 | break; |
293 | ||
294 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 295 | s->auth_proto = packet_get_string(&proto_len); |
296 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 297 | |
2af09193 | 298 | screen_flag = packet_get_protocol_flags() & |
299 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
300 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
301 | ||
302 | if (packet_remaining() == 4) { | |
303 | if (!screen_flag) | |
304 | debug2("Buggy client: " | |
305 | "X11 screen flag missing"); | |
7368a6c8 | 306 | s->screen = packet_get_int(); |
c8b058b4 | 307 | } else { |
7368a6c8 | 308 | s->screen = 0; |
c8b058b4 | 309 | } |
95500969 | 310 | packet_check_eom(); |
8dcd9d5c | 311 | success = session_setup_x11fwd(s); |
312 | if (!success) { | |
313 | xfree(s->auth_proto); | |
314 | xfree(s->auth_data); | |
1500bcdd | 315 | s->auth_proto = NULL; |
316 | s->auth_data = NULL; | |
7368a6c8 | 317 | } |
7368a6c8 | 318 | break; |
7368a6c8 | 319 | |
320 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
321 | if (no_agent_forwarding_flag || compat13) { | |
322 | debug("Authentication agent forwarding not permitted for this authentication."); | |
323 | break; | |
324 | } | |
325 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 326 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 327 | break; |
328 | ||
329 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
330 | if (no_port_forwarding_flag) { | |
331 | debug("Port forwarding not permitted for this authentication."); | |
332 | break; | |
333 | } | |
33de75a3 | 334 | if (!options.allow_tcp_forwarding) { |
335 | debug("Port forwarding not permitted."); | |
336 | break; | |
337 | } | |
7368a6c8 | 338 | debug("Received TCP/IP port forwarding request."); |
bb5639fe | 339 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 340 | success = 1; |
341 | break; | |
342 | ||
343 | case SSH_CMSG_MAX_PACKET_SIZE: | |
344 | if (packet_set_maxsize(packet_get_int()) > 0) | |
345 | success = 1; | |
346 | break; | |
184eed6a | 347 | |
7368a6c8 | 348 | case SSH_CMSG_EXEC_SHELL: |
349 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 350 | if (type == SSH_CMSG_EXEC_CMD) { |
351 | command = packet_get_string(&dlen); | |
352 | debug("Exec command '%.500s'", command); | |
c95add71 | 353 | do_exec(s, command); |
354 | xfree(command); | |
7368a6c8 | 355 | } else { |
c95add71 | 356 | do_exec(s, NULL); |
7368a6c8 | 357 | } |
95500969 | 358 | packet_check_eom(); |
fc2a1d28 | 359 | session_close(s); |
7368a6c8 | 360 | return; |
361 | ||
362 | default: | |
363 | /* | |
364 | * Any unknown messages in this phase are ignored, | |
365 | * and a failure message is returned. | |
366 | */ | |
bbe88b6d | 367 | logit("Unknown packet type received after authentication: %d", type); |
7368a6c8 | 368 | } |
369 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
370 | packet_send(); | |
371 | packet_write_wait(); | |
372 | ||
373 | /* Enable compression now that we have replied if appropriate. */ | |
374 | if (enable_compression_after_reply) { | |
375 | enable_compression_after_reply = 0; | |
376 | packet_start_compression(compression_level); | |
377 | } | |
378 | } | |
379 | } | |
380 | ||
381 | /* | |
382 | * This is called to fork and execute a command when we have no tty. This | |
383 | * will call do_child from the child, and server_loop from the parent after | |
384 | * setting up file descriptors and such. | |
385 | */ | |
6ae2364d | 386 | void |
65068d16 | 387 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 388 | { |
c457707e | 389 | pid_t pid; |
7368a6c8 | 390 | |
391 | #ifdef USE_PIPES | |
392 | int pin[2], pout[2], perr[2]; | |
393 | /* Allocate pipes for communicating with the program. */ | |
394 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
395 | packet_disconnect("Could not create pipes: %.100s", | |
396 | strerror(errno)); | |
397 | #else /* USE_PIPES */ | |
398 | int inout[2], err[2]; | |
399 | /* Uses socket pairs to communicate with the program. */ | |
400 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
401 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
402 | packet_disconnect("Could not create socket pairs: %.100s", | |
403 | strerror(errno)); | |
404 | #endif /* USE_PIPES */ | |
405 | if (s == NULL) | |
406 | fatal("do_exec_no_pty: no session"); | |
407 | ||
1d1ffb87 | 408 | session_proctitle(s); |
7368a6c8 | 409 | |
b19d61d7 | 410 | #if defined(USE_PAM) |
59f327e0 | 411 | if (options.use_pam && !use_privsep) |
7fceb20d | 412 | do_pam_setcred(1); |
266140a8 | 413 | #endif /* USE_PAM */ |
414 | ||
7368a6c8 | 415 | /* Fork the child. */ |
416 | if ((pid = fork()) == 0) { | |
2362db19 | 417 | is_child = 1; |
516f0d7d | 418 | |
7368a6c8 | 419 | /* Child. Reinitialize the log since the pid has changed. */ |
420 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
421 | ||
422 | /* | |
423 | * Create a new session and process group since the 4.4BSD | |
424 | * setlogin() affects the entire process group. | |
425 | */ | |
426 | if (setsid() < 0) | |
427 | error("setsid failed: %.100s", strerror(errno)); | |
428 | ||
429 | #ifdef USE_PIPES | |
430 | /* | |
431 | * Redirect stdin. We close the parent side of the socket | |
432 | * pair, and make the child side the standard input. | |
433 | */ | |
434 | close(pin[1]); | |
435 | if (dup2(pin[0], 0) < 0) | |
436 | perror("dup2 stdin"); | |
437 | close(pin[0]); | |
438 | ||
439 | /* Redirect stdout. */ | |
440 | close(pout[0]); | |
441 | if (dup2(pout[1], 1) < 0) | |
442 | perror("dup2 stdout"); | |
443 | close(pout[1]); | |
444 | ||
445 | /* Redirect stderr. */ | |
446 | close(perr[0]); | |
447 | if (dup2(perr[1], 2) < 0) | |
448 | perror("dup2 stderr"); | |
449 | close(perr[1]); | |
450 | #else /* USE_PIPES */ | |
451 | /* | |
452 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
453 | * use the same socket, as some programs (particularly rdist) | |
454 | * seem to depend on it. | |
455 | */ | |
456 | close(inout[1]); | |
457 | close(err[1]); | |
458 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
459 | perror("dup2 stdin"); | |
460 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
461 | perror("dup2 stdout"); | |
462 | if (dup2(err[0], 2) < 0) /* stderr */ | |
463 | perror("dup2 stderr"); | |
464 | #endif /* USE_PIPES */ | |
465 | ||
ef51930f | 466 | #ifdef _UNICOS |
467 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
468 | #endif | |
469 | ||
7368a6c8 | 470 | /* Do processing for the child (exec command etc). */ |
56b3e9ce | 471 | do_child(s, command); |
7368a6c8 | 472 | /* NOTREACHED */ |
473 | } | |
ef51930f | 474 | #ifdef _UNICOS |
475 | signal(WJSIGNAL, cray_job_termination_handler); | |
476 | #endif /* _UNICOS */ | |
3c62e7eb | 477 | #ifdef HAVE_CYGWIN |
478 | if (is_winnt) | |
479 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
480 | #endif | |
7368a6c8 | 481 | if (pid < 0) |
482 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
483 | s->pid = pid; | |
b5c334cc | 484 | /* Set interactive/non-interactive mode. */ |
485 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 486 | #ifdef USE_PIPES |
487 | /* We are the parent. Close the child sides of the pipes. */ | |
488 | close(pin[0]); | |
489 | close(pout[1]); | |
490 | close(perr[1]); | |
491 | ||
e78a59f5 | 492 | if (compat20) { |
d7ecbe88 | 493 | if (s->is_subsystem) { |
494 | close(perr[0]); | |
495 | perr[0] = -1; | |
496 | } | |
497 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
e78a59f5 | 498 | } else { |
499 | /* Enter the interactive session. */ | |
500 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 501 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 502 | } |
7368a6c8 | 503 | #else /* USE_PIPES */ |
504 | /* We are the parent. Close the child sides of the socket pairs. */ | |
505 | close(inout[0]); | |
506 | close(err[0]); | |
507 | ||
75dbfa01 | 508 | /* |
509 | * Clear loginmsg, since it's the child's responsibility to display | |
510 | * it to the user, otherwise multiple sessions may accumulate | |
511 | * multiple copies of the login messages. | |
512 | */ | |
513 | buffer_clear(&loginmsg); | |
514 | ||
7368a6c8 | 515 | /* |
516 | * Enter the interactive session. Note: server_loop must be able to | |
517 | * handle the case that fdin and fdout are the same. | |
518 | */ | |
e78a59f5 | 519 | if (compat20) { |
e5d7a405 | 520 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 521 | } else { |
522 | server_loop(pid, inout[1], inout[1], err[1]); | |
523 | /* server_loop has closed inout[1] and err[1]. */ | |
524 | } | |
7368a6c8 | 525 | #endif /* USE_PIPES */ |
526 | } | |
527 | ||
528 | /* | |
529 | * This is called to fork and execute a command when we have a tty. This | |
530 | * will call do_child from the child, and server_loop from the parent after | |
531 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
532 | * lastlog, and other such operations. | |
533 | */ | |
6ae2364d | 534 | void |
65068d16 | 535 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 536 | { |
7368a6c8 | 537 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 538 | pid_t pid; |
7368a6c8 | 539 | |
540 | if (s == NULL) | |
541 | fatal("do_exec_pty: no session"); | |
542 | ptyfd = s->ptyfd; | |
543 | ttyfd = s->ttyfd; | |
544 | ||
b19d61d7 | 545 | #if defined(USE_PAM) |
7fceb20d | 546 | if (options.use_pam) { |
49e82bb9 | 547 | do_pam_set_tty(s->tty); |
72037bc8 | 548 | if (!use_privsep) |
549 | do_pam_setcred(1); | |
7fceb20d | 550 | } |
27cf96de | 551 | #endif |
266140a8 | 552 | |
7368a6c8 | 553 | /* Fork the child. */ |
554 | if ((pid = fork()) == 0) { | |
2362db19 | 555 | is_child = 1; |
57156994 | 556 | |
c345cf9d | 557 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 558 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 559 | /* Close the master side of the pseudo tty. */ |
560 | close(ptyfd); | |
561 | ||
562 | /* Make the pseudo tty our controlling tty. */ | |
563 | pty_make_controlling_tty(&ttyfd, s->tty); | |
564 | ||
05fd093c | 565 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
566 | if (dup2(ttyfd, 0) < 0) | |
567 | error("dup2 stdin: %s", strerror(errno)); | |
568 | if (dup2(ttyfd, 1) < 0) | |
569 | error("dup2 stdout: %s", strerror(errno)); | |
570 | if (dup2(ttyfd, 2) < 0) | |
571 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 572 | |
573 | /* Close the extra descriptor for the pseudo tty. */ | |
574 | close(ttyfd); | |
575 | ||
c345cf9d | 576 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 577 | #ifndef HAVE_OSF_SIA |
ef51930f | 578 | if (!(options.use_login && command == NULL)) { |
579 | #ifdef _UNICOS | |
580 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
581 | #endif /* _UNICOS */ | |
a22aff1f | 582 | do_login(s, command); |
ef51930f | 583 | } |
7e2d5fa4 | 584 | # ifdef LOGIN_NEEDS_UTMPX |
585 | else | |
586 | do_pre_login(s); | |
587 | # endif | |
c96a4aaf | 588 | #endif |
7368a6c8 | 589 | |
7368a6c8 | 590 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 591 | do_child(s, command); |
7368a6c8 | 592 | /* NOTREACHED */ |
593 | } | |
ef51930f | 594 | #ifdef _UNICOS |
595 | signal(WJSIGNAL, cray_job_termination_handler); | |
596 | #endif /* _UNICOS */ | |
3c62e7eb | 597 | #ifdef HAVE_CYGWIN |
598 | if (is_winnt) | |
599 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
600 | #endif | |
7368a6c8 | 601 | if (pid < 0) |
602 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
603 | s->pid = pid; | |
604 | ||
605 | /* Parent. Close the slave side of the pseudo tty. */ | |
606 | close(ttyfd); | |
607 | ||
608 | /* | |
609 | * Create another descriptor of the pty master side for use as the | |
610 | * standard input. We could use the original descriptor, but this | |
611 | * simplifies code in server_loop. The descriptor is bidirectional. | |
612 | */ | |
613 | fdout = dup(ptyfd); | |
614 | if (fdout < 0) | |
615 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
616 | ||
617 | /* we keep a reference to the pty master */ | |
618 | ptymaster = dup(ptyfd); | |
619 | if (ptymaster < 0) | |
620 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
621 | s->ptymaster = ptymaster; | |
622 | ||
623 | /* Enter interactive session. */ | |
b5c334cc | 624 | packet_set_interactive(1); |
e78a59f5 | 625 | if (compat20) { |
626 | session_set_fds(s, ptyfd, fdout, -1); | |
627 | } else { | |
628 | server_loop(pid, ptyfd, fdout, -1); | |
629 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 630 | } |
7368a6c8 | 631 | } |
632 | ||
7e2d5fa4 | 633 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 634 | static void |
7e2d5fa4 | 635 | do_pre_login(Session *s) |
636 | { | |
637 | socklen_t fromlen; | |
638 | struct sockaddr_storage from; | |
639 | pid_t pid = getpid(); | |
640 | ||
641 | /* | |
642 | * Get IP address of client. If the connection is not a socket, let | |
643 | * the address be 0.0.0.0. | |
644 | */ | |
645 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 646 | fromlen = sizeof(from); |
7e2d5fa4 | 647 | if (packet_connection_is_on_socket()) { |
7e2d5fa4 | 648 | if (getpeername(packet_get_connection_in(), |
32596c7b | 649 | (struct sockaddr *)&from, &fromlen) < 0) { |
7e2d5fa4 | 650 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 651 | cleanup_exit(255); |
7e2d5fa4 | 652 | } |
653 | } | |
654 | ||
655 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
c5a7d788 | 656 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d4ac26ed | 657 | (struct sockaddr *)&from, fromlen); |
7e2d5fa4 | 658 | } |
659 | #endif | |
660 | ||
dac6753b | 661 | /* |
662 | * This is called to fork and execute a command. If another command is | |
663 | * to be forced, execute that instead. | |
664 | */ | |
665 | void | |
666 | do_exec(Session *s, const char *command) | |
667 | { | |
668 | if (forced_command) { | |
669 | original_command = command; | |
670 | command = forced_command; | |
dac6753b | 671 | debug("Forced command '%.900s'", command); |
672 | } | |
673 | ||
6039eeef | 674 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 675 | if (command != NULL) |
676 | PRIVSEP(audit_run_command(command)); | |
677 | else if (s->ttyfd == -1) { | |
678 | char *shell = s->pw->pw_shell; | |
679 | ||
680 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
681 | shell =_PATH_BSHELL; | |
682 | PRIVSEP(audit_run_command(shell)); | |
683 | } | |
684 | #endif | |
685 | ||
dac6753b | 686 | if (s->ttyfd != -1) |
687 | do_exec_pty(s, command); | |
688 | else | |
689 | do_exec_no_pty(s, command); | |
690 | ||
c95add71 | 691 | original_command = NULL; |
dac6753b | 692 | |
be2ca0c9 | 693 | /* |
694 | * Clear loginmsg: it's the child's responsibility to display | |
695 | * it to the user, otherwise multiple sessions may accumulate | |
696 | * multiple copies of the login messages. | |
697 | */ | |
698 | buffer_clear(&loginmsg); | |
699 | } | |
f7342052 | 700 | |
c345cf9d | 701 | /* administrative, login(1)-like work */ |
702 | void | |
a22aff1f | 703 | do_login(Session *s, const char *command) |
c345cf9d | 704 | { |
c345cf9d | 705 | socklen_t fromlen; |
706 | struct sockaddr_storage from; | |
c345cf9d | 707 | struct passwd * pw = s->pw; |
708 | pid_t pid = getpid(); | |
709 | ||
710 | /* | |
711 | * Get IP address of client. If the connection is not a socket, let | |
712 | * the address be 0.0.0.0. | |
713 | */ | |
714 | memset(&from, 0, sizeof(from)); | |
d4ac26ed | 715 | fromlen = sizeof(from); |
c345cf9d | 716 | if (packet_connection_is_on_socket()) { |
c345cf9d | 717 | if (getpeername(packet_get_connection_in(), |
f7342052 | 718 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 719 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 720 | cleanup_exit(255); |
c345cf9d | 721 | } |
722 | } | |
723 | ||
724 | /* Record that there was a login on that tty from the remote host. */ | |
49a34e84 | 725 | if (!use_privsep) |
726 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
727 | get_remote_name_or_ip(utmp_len, | |
c5a7d788 | 728 | options.use_dns), |
ba1566dd | 729 | (struct sockaddr *)&from, fromlen); |
c345cf9d | 730 | |
2919e060 | 731 | #ifdef USE_PAM |
732 | /* | |
733 | * If password change is needed, do it now. | |
734 | * This needs to occur before the ~/.hushlogin check. | |
735 | */ | |
dd1fb864 | 736 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
737 | display_loginmsg(); | |
2919e060 | 738 | do_pam_chauthtok(); |
dd1fb864 | 739 | s->authctxt->force_pwchange = 0; |
5b9e2464 | 740 | /* XXX - signal [net] parent to enable forwardings */ |
2919e060 | 741 | } |
742 | #endif | |
743 | ||
f2c2fd71 | 744 | if (check_quietlogin(s, command)) |
c345cf9d | 745 | return; |
746 | ||
dd1fb864 | 747 | display_loginmsg(); |
c345cf9d | 748 | |
f2c2fd71 | 749 | do_motd(); |
750 | } | |
751 | ||
752 | /* | |
753 | * Display the message of the day. | |
754 | */ | |
755 | void | |
756 | do_motd(void) | |
757 | { | |
758 | FILE *f; | |
759 | char buf[256]; | |
760 | ||
c345cf9d | 761 | if (options.print_motd) { |
2e73a022 | 762 | #ifdef HAVE_LOGIN_CAP |
763 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
764 | "/etc/motd"), "r"); | |
765 | #else | |
c345cf9d | 766 | f = fopen("/etc/motd", "r"); |
2e73a022 | 767 | #endif |
c345cf9d | 768 | if (f) { |
769 | while (fgets(buf, sizeof(buf), f)) | |
770 | fputs(buf, stdout); | |
771 | fclose(f); | |
772 | } | |
773 | } | |
774 | } | |
775 | ||
9c328529 | 776 | |
777 | /* | |
778 | * Check for quiet login, either .hushlogin or command given. | |
779 | */ | |
780 | int | |
781 | check_quietlogin(Session *s, const char *command) | |
782 | { | |
783 | char buf[256]; | |
784 | struct passwd *pw = s->pw; | |
785 | struct stat st; | |
786 | ||
787 | /* Return 1 if .hushlogin exists or a command given. */ | |
788 | if (command != NULL) | |
789 | return 1; | |
790 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
791 | #ifdef HAVE_LOGIN_CAP | |
792 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
793 | return 1; | |
794 | #else | |
795 | if (stat(buf, &st) >= 0) | |
796 | return 1; | |
797 | #endif | |
798 | return 0; | |
799 | } | |
800 | ||
7368a6c8 | 801 | /* |
802 | * Sets the value of the given variable in the environment. If the variable | |
803 | * already exists, its value is overriden. | |
804 | */ | |
7364bd04 | 805 | void |
1e3b8b07 | 806 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
184eed6a | 807 | const char *value) |
7368a6c8 | 808 | { |
7368a6c8 | 809 | char **env; |
c46e584f | 810 | u_int envsize; |
811 | u_int i, namelen; | |
7368a6c8 | 812 | |
95b99395 | 813 | /* |
814 | * If we're passed an uninitialized list, allocate a single null | |
815 | * entry before continuing. | |
816 | */ | |
817 | if (*envp == NULL && *envsizep == 0) { | |
818 | *envp = xmalloc(sizeof(char *)); | |
819 | *envp[0] = NULL; | |
820 | *envsizep = 1; | |
821 | } | |
822 | ||
7368a6c8 | 823 | /* |
824 | * Find the slot where the value should be stored. If the variable | |
825 | * already exists, we reuse the slot; otherwise we append a new slot | |
826 | * at the end of the array, expanding if necessary. | |
827 | */ | |
828 | env = *envp; | |
829 | namelen = strlen(name); | |
830 | for (i = 0; env[i]; i++) | |
831 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
832 | break; | |
833 | if (env[i]) { | |
834 | /* Reuse the slot. */ | |
835 | xfree(env[i]); | |
836 | } else { | |
837 | /* New variable. Expand if necessary. */ | |
c46e584f | 838 | envsize = *envsizep; |
839 | if (i >= envsize - 1) { | |
840 | if (envsize >= 1000) | |
841 | fatal("child_set_env: too many env vars"); | |
842 | envsize += 50; | |
c5d10563 | 843 | env = (*envp) = xrealloc(env, envsize, sizeof(char *)); |
c46e584f | 844 | *envsizep = envsize; |
7368a6c8 | 845 | } |
846 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
847 | env[i + 1] = NULL; | |
848 | } | |
849 | ||
850 | /* Allocate space and format the variable in the appropriate slot. */ | |
851 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
852 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
853 | } | |
854 | ||
855 | /* | |
856 | * Reads environment variables from the given file and adds/overrides them | |
857 | * into the environment. If the file does not exist, this does nothing. | |
858 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
859 | * and assignments of the form name=value. No other forms are allowed. | |
860 | */ | |
396c147e | 861 | static void |
1e3b8b07 | 862 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 863 | const char *filename) |
7368a6c8 | 864 | { |
865 | FILE *f; | |
866 | char buf[4096]; | |
867 | char *cp, *value; | |
66087567 | 868 | u_int lineno = 0; |
7368a6c8 | 869 | |
870 | f = fopen(filename, "r"); | |
871 | if (!f) | |
872 | return; | |
873 | ||
874 | while (fgets(buf, sizeof(buf), f)) { | |
66087567 | 875 | if (++lineno > 1000) |
876 | fatal("Too many lines in environment file %s", filename); | |
7368a6c8 | 877 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
878 | ; | |
879 | if (!*cp || *cp == '#' || *cp == '\n') | |
880 | continue; | |
881 | if (strchr(cp, '\n')) | |
882 | *strchr(cp, '\n') = '\0'; | |
883 | value = strchr(cp, '='); | |
884 | if (value == NULL) { | |
66087567 | 885 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
886 | filename); | |
7368a6c8 | 887 | continue; |
888 | } | |
71276795 | 889 | /* |
890 | * Replace the equals sign by nul, and advance value to | |
891 | * the value string. | |
892 | */ | |
7368a6c8 | 893 | *value = '\0'; |
894 | value++; | |
895 | child_set_env(env, envsize, cp, value); | |
896 | } | |
897 | fclose(f); | |
898 | } | |
899 | ||
95b99395 | 900 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
901 | /* | |
902 | * Return named variable from specified environment, or NULL if not present. | |
903 | */ | |
904 | static char * | |
905 | child_get_env(char **env, const char *name) | |
906 | { | |
907 | int i; | |
908 | size_t len; | |
909 | ||
910 | len = strlen(name); | |
911 | for (i=0; env[i] != NULL; i++) | |
912 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
913 | return(env[i] + len + 1); | |
914 | return NULL; | |
915 | } | |
916 | ||
917 | /* | |
918 | * Read /etc/default/login. | |
919 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
920 | */ | |
921 | static void | |
922 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
923 | { | |
924 | char **tmpenv = NULL, *var; | |
6f99680f | 925 | u_int i, tmpenvsize = 0; |
3a23ba0e | 926 | u_long mask; |
95b99395 | 927 | |
928 | /* | |
929 | * We don't want to copy the whole file to the child's environment, | |
930 | * so we use a temporary environment and copy the variables we're | |
931 | * interested in. | |
932 | */ | |
933 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
934 | ||
6f99680f | 935 | if (tmpenv == NULL) |
936 | return; | |
937 | ||
95b99395 | 938 | if (uid == 0) |
939 | var = child_get_env(tmpenv, "SUPATH"); | |
940 | else | |
941 | var = child_get_env(tmpenv, "PATH"); | |
942 | if (var != NULL) | |
943 | child_set_env(env, envsize, "PATH", var); | |
b6453d99 | 944 | |
95b99395 | 945 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
946 | if (sscanf(var, "%5lo", &mask) == 1) | |
3a23ba0e | 947 | umask((mode_t)mask); |
b6453d99 | 948 | |
95b99395 | 949 | for (i = 0; tmpenv[i] != NULL; i++) |
950 | xfree(tmpenv[i]); | |
951 | xfree(tmpenv); | |
952 | } | |
953 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
954 | ||
1db07e7d | 955 | void |
956 | copy_environment(char **source, char ***env, u_int *envsize) | |
7368a6c8 | 957 | { |
760b35a6 | 958 | char *var_name, *var_val; |
7368a6c8 | 959 | int i; |
960 | ||
760b35a6 | 961 | if (source == NULL) |
7368a6c8 | 962 | return; |
2b87da3b | 963 | |
760b35a6 | 964 | for(i = 0; source[i] != NULL; i++) { |
965 | var_name = xstrdup(source[i]); | |
966 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
967 | xfree(var_name); | |
7368a6c8 | 968 | continue; |
7368a6c8 | 969 | } |
760b35a6 | 970 | *var_val++ = '\0'; |
7368a6c8 | 971 | |
760b35a6 | 972 | debug3("Copy environment: %s=%s", var_name, var_val); |
973 | child_set_env(env, envsize, var_name, var_val); | |
b6453d99 | 974 | |
760b35a6 | 975 | xfree(var_name); |
22d89d24 | 976 | } |
977 | } | |
22d89d24 | 978 | |
f7342052 | 979 | static char ** |
980 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 981 | { |
7368a6c8 | 982 | char buf[256]; |
f7342052 | 983 | u_int i, envsize; |
95b99395 | 984 | char **env, *laddr, *path = NULL; |
f7342052 | 985 | struct passwd *pw = s->pw; |
7368a6c8 | 986 | |
7368a6c8 | 987 | /* Initialize the environment. */ |
988 | envsize = 100; | |
01d35895 | 989 | env = xcalloc(envsize, sizeof(char *)); |
7368a6c8 | 990 | env[0] = NULL; |
991 | ||
3c62e7eb | 992 | #ifdef HAVE_CYGWIN |
993 | /* | |
994 | * The Windows environment contains some setting which are | |
995 | * important for a running system. They must not be dropped. | |
996 | */ | |
3c502155 | 997 | { |
998 | char **p; | |
999 | ||
1000 | p = fetch_windows_environment(); | |
1001 | copy_environment(p, &env, &envsize); | |
1002 | free_windows_environment(p); | |
1003 | } | |
3c62e7eb | 1004 | #endif |
1005 | ||
7364bd04 | 1006 | #ifdef GSSAPI |
aff51935 | 1007 | /* Allow any GSSAPI methods that we've used to alter |
7364bd04 | 1008 | * the childs environment as they see fit |
1009 | */ | |
1010 | ssh_gssapi_do_child(&env, &envsize); | |
1011 | #endif | |
1012 | ||
7368a6c8 | 1013 | if (!options.use_login) { |
1014 | /* Set basic environment. */ | |
61a2c1da | 1015 | for (i = 0; i < s->num_env; i++) |
f2107e97 | 1016 | child_set_env(&env, &envsize, s->env[i].name, |
61a2c1da | 1017 | s->env[i].val); |
1018 | ||
7368a6c8 | 1019 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1020 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
17ed08c5 | 1021 | #ifdef _AIX |
1022 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1023 | #endif | |
7368a6c8 | 1024 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
2e73a022 | 1025 | #ifdef HAVE_LOGIN_CAP |
97686bf9 | 1026 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1027 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1028 | else | |
1029 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1030 | #else /* HAVE_LOGIN_CAP */ |
1031 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1032 | /* |
1033 | * There's no standard path on Windows. The path contains | |
1034 | * important components pointing to the system directories, | |
1035 | * needed for loading shared libraries. So the path better | |
1036 | * remains intact here. | |
1037 | */ | |
95b99395 | 1038 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1039 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1040 | path = child_get_env(env, "PATH"); | |
1041 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1042 | if (path == NULL || *path == '\0') { | |
aff51935 | 1043 | child_set_env(&env, &envsize, "PATH", |
95b99395 | 1044 | s->pw->pw_uid == 0 ? |
1045 | SUPERUSER_PATH : _PATH_STDPATH); | |
1046 | } | |
22d89d24 | 1047 | # endif /* HAVE_CYGWIN */ |
1048 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1049 | |
1050 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1051 | _PATH_MAILDIR, pw->pw_name); | |
1052 | child_set_env(&env, &envsize, "MAIL", buf); | |
1053 | ||
1054 | /* Normal systems set SHELL by default. */ | |
1055 | child_set_env(&env, &envsize, "SHELL", shell); | |
1056 | } | |
1057 | if (getenv("TZ")) | |
1058 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1059 | ||
1060 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 1061 | if (!options.use_login) { |
1062 | while (custom_environment) { | |
1063 | struct envstring *ce = custom_environment; | |
7fdc56c5 | 1064 | char *str = ce->s; |
f7342052 | 1065 | |
7fdc56c5 | 1066 | for (i = 0; str[i] != '=' && str[i]; i++) |
2548961d | 1067 | ; |
7fdc56c5 | 1068 | if (str[i] == '=') { |
1069 | str[i] = 0; | |
1070 | child_set_env(&env, &envsize, str, str + i + 1); | |
2548961d | 1071 | } |
1072 | custom_environment = ce->next; | |
1073 | xfree(ce->s); | |
1074 | xfree(ce); | |
7368a6c8 | 1075 | } |
7368a6c8 | 1076 | } |
1077 | ||
da0561eb | 1078 | /* SSH_CLIENT deprecated */ |
7368a6c8 | 1079 | snprintf(buf, sizeof buf, "%.50s %d %d", |
f7342052 | 1080 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1081 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1082 | ||
3e2f2431 | 1083 | laddr = get_local_ipaddr(packet_get_connection_in()); |
da0561eb | 1084 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
3e2f2431 | 1085 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1086 | xfree(laddr); | |
da0561eb | 1087 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1088 | ||
56b3e9ce | 1089 | if (s->ttyfd != -1) |
1090 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1091 | if (s->term) | |
1092 | child_set_env(&env, &envsize, "TERM", s->term); | |
1093 | if (s->display) | |
1094 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1095 | if (original_command) |
1096 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1097 | original_command); | |
7368a6c8 | 1098 | |
ef51930f | 1099 | #ifdef _UNICOS |
1100 | if (cray_tmpdir[0] != '\0') | |
1101 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1102 | #endif /* _UNICOS */ | |
1103 | ||
3bfd27d5 | 1104 | /* |
1105 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1106 | * must have been set by a native authentication method (eg AIX or | |
1107 | * SIA), so copy it to the child. | |
1108 | */ | |
1109 | { | |
1110 | char *cp; | |
1111 | ||
1112 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1113 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1114 | } | |
1115 | ||
7368a6c8 | 1116 | #ifdef _AIX |
4936fcee | 1117 | { |
1118 | char *cp; | |
1119 | ||
1120 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1121 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
4936fcee | 1122 | read_environment_file(&env, &envsize, "/etc/environment"); |
1123 | } | |
7368a6c8 | 1124 | #endif |
ced49be2 | 1125 | #ifdef KRB5 |
6490a5d5 | 1126 | if (s->authctxt->krb5_ccname) |
ced49be2 | 1127 | child_set_env(&env, &envsize, "KRB5CCNAME", |
6490a5d5 | 1128 | s->authctxt->krb5_ccname); |
ced49be2 | 1129 | #endif |
7368a6c8 | 1130 | #ifdef USE_PAM |
ee48c949 | 1131 | /* |
1132 | * Pull in any environment variables that may have | |
1133 | * been set by PAM. | |
1134 | */ | |
7fceb20d | 1135 | if (options.use_pam) { |
2212fc98 | 1136 | char **p; |
b6453d99 | 1137 | |
2212fc98 | 1138 | p = fetch_pam_child_environment(); |
1139 | copy_environment(p, &env, &envsize); | |
1140 | free_pam_environment(p); | |
ee48c949 | 1141 | |
2212fc98 | 1142 | p = fetch_pam_environment(); |
ee48c949 | 1143 | copy_environment(p, &env, &envsize); |
1144 | free_pam_environment(p); | |
1145 | } | |
7368a6c8 | 1146 | #endif /* USE_PAM */ |
1147 | ||
149cdb60 | 1148 | if (auth_sock_name != NULL) |
7368a6c8 | 1149 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1150 | auth_sock_name); |
7368a6c8 | 1151 | |
1152 | /* read $HOME/.ssh/environment. */ | |
f00bab84 | 1153 | if (options.permit_user_env && !options.use_login) { |
71276795 | 1154 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e2e36358 | 1155 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
7368a6c8 | 1156 | read_environment_file(&env, &envsize, buf); |
1157 | } | |
1158 | if (debug_flag) { | |
1159 | /* dump the environment */ | |
1160 | fprintf(stderr, "Environment:\n"); | |
1161 | for (i = 0; env[i]; i++) | |
1162 | fprintf(stderr, " %.200s\n", env[i]); | |
1163 | } | |
f7342052 | 1164 | return env; |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1169 | * first in this order). | |
1170 | */ | |
1171 | static void | |
1172 | do_rc_files(Session *s, const char *shell) | |
1173 | { | |
1174 | FILE *f = NULL; | |
1175 | char cmd[1024]; | |
1176 | int do_xauth; | |
1177 | struct stat st; | |
1178 | ||
1179 | do_xauth = | |
1180 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1181 | ||
1182 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1183 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1184 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1185 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1186 | if (debug_flag) | |
1187 | fprintf(stderr, "Running %s\n", cmd); | |
1188 | f = popen(cmd, "w"); | |
1189 | if (f) { | |
1190 | if (do_xauth) | |
1191 | fprintf(f, "%s %s\n", s->auth_proto, | |
1192 | s->auth_data); | |
1193 | pclose(f); | |
1194 | } else | |
1195 | fprintf(stderr, "Could not run %s\n", | |
1196 | _PATH_SSH_USER_RC); | |
1197 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1198 | if (debug_flag) | |
1199 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1200 | _PATH_SSH_SYSTEM_RC); | |
1201 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1202 | if (f) { | |
1203 | if (do_xauth) | |
1204 | fprintf(f, "%s %s\n", s->auth_proto, | |
1205 | s->auth_data); | |
1206 | pclose(f); | |
1207 | } else | |
1208 | fprintf(stderr, "Could not run %s\n", | |
1209 | _PATH_SSH_SYSTEM_RC); | |
1210 | } else if (do_xauth && options.xauth_location != NULL) { | |
1211 | /* Add authority data to .Xauthority if appropriate. */ | |
1212 | if (debug_flag) { | |
1213 | fprintf(stderr, | |
fe661d8f | 1214 | "Running %.500s remove %.100s\n", |
2362db19 | 1215 | options.xauth_location, s->auth_display); |
fe661d8f | 1216 | fprintf(stderr, |
1217 | "%.500s add %.100s %.100s %.100s\n", | |
f7342052 | 1218 | options.xauth_location, s->auth_display, |
1219 | s->auth_proto, s->auth_data); | |
1220 | } | |
1221 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1222 | options.xauth_location); | |
1223 | f = popen(cmd, "w"); | |
1224 | if (f) { | |
fe661d8f | 1225 | fprintf(f, "remove %s\n", |
1226 | s->auth_display); | |
f7342052 | 1227 | fprintf(f, "add %s %s %s\n", |
1228 | s->auth_display, s->auth_proto, | |
1229 | s->auth_data); | |
1230 | pclose(f); | |
1231 | } else { | |
1232 | fprintf(stderr, "Could not run %s\n", | |
1233 | cmd); | |
1234 | } | |
1235 | } | |
1236 | } | |
1237 | ||
1238 | static void | |
1239 | do_nologin(struct passwd *pw) | |
1240 | { | |
1241 | FILE *f = NULL; | |
1242 | char buf[1024]; | |
1243 | ||
1244 | #ifdef HAVE_LOGIN_CAP | |
1245 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1246 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1247 | _PATH_NOLOGIN), "r"); | |
1248 | #else | |
1249 | if (pw->pw_uid) | |
1250 | f = fopen(_PATH_NOLOGIN, "r"); | |
1251 | #endif | |
1252 | if (f) { | |
1253 | /* /etc/nologin exists. Print its contents and exit. */ | |
bbe88b6d | 1254 | logit("User %.100s not allowed because %s exists", |
8bd4e2ae | 1255 | pw->pw_name, _PATH_NOLOGIN); |
f7342052 | 1256 | while (fgets(buf, sizeof(buf), f)) |
1257 | fputs(buf, stderr); | |
1258 | fclose(f); | |
99f4fb69 | 1259 | fflush(NULL); |
f7342052 | 1260 | exit(254); |
1261 | } | |
1262 | } | |
1263 | ||
1264 | /* Set login name, uid, gid, and groups. */ | |
1853d1ef | 1265 | void |
f7342052 | 1266 | do_setusercontext(struct passwd *pw) |
1267 | { | |
2731632a | 1268 | #ifndef HAVE_CYGWIN |
1269 | if (getuid() == 0 || geteuid() == 0) | |
f7342052 | 1270 | #endif /* HAVE_CYGWIN */ |
2731632a | 1271 | { |
1272 | ||
8bbfc882 | 1273 | #ifdef HAVE_SETPCRED |
166baacc | 1274 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1275 | fatal("Failed to set process credentials"); | |
8bbfc882 | 1276 | #endif /* HAVE_SETPCRED */ |
f7342052 | 1277 | #ifdef HAVE_LOGIN_CAP |
2d199535 | 1278 | # ifdef __bsdi__ |
8695f9f7 | 1279 | setpgid(0, 0); |
2d199535 | 1280 | # endif |
09d7ebd1 | 1281 | #ifdef GSSAPI |
1282 | if (options.gss_authentication) { | |
1283 | temporarily_use_uid(pw); | |
1284 | ssh_gssapi_storecreds(); | |
1285 | restore_uid(); | |
1286 | } | |
1287 | #endif | |
f4eaee12 | 1288 | # ifdef USE_PAM |
1289 | if (options.use_pam) { | |
1290 | do_pam_session(); | |
1291 | do_pam_setcred(0); | |
1292 | } | |
1293 | # endif /* USE_PAM */ | |
f7342052 | 1294 | if (setusercontext(lc, pw, pw->pw_uid, |
1295 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1296 | perror("unable to set user context"); | |
1297 | exit(1); | |
1298 | } | |
1299 | #else | |
1300 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1301 | /* Sets login uid for accounting */ | |
1302 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1303 | error("setluid: %s", strerror(errno)); | |
1304 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1305 | ||
1306 | if (setlogin(pw->pw_name) < 0) | |
1307 | error("setlogin failed: %s", strerror(errno)); | |
1308 | if (setgid(pw->pw_gid) < 0) { | |
1309 | perror("setgid"); | |
1310 | exit(1); | |
1311 | } | |
1312 | /* Initialize the group list. */ | |
1313 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1314 | perror("initgroups"); | |
1315 | exit(1); | |
1316 | } | |
1317 | endgrent(); | |
09d7ebd1 | 1318 | #ifdef GSSAPI |
1319 | if (options.gss_authentication) { | |
1320 | temporarily_use_uid(pw); | |
1321 | ssh_gssapi_storecreds(); | |
1322 | restore_uid(); | |
1323 | } | |
1324 | #endif | |
f7342052 | 1325 | # ifdef USE_PAM |
1326 | /* | |
aff51935 | 1327 | * PAM credentials may take the form of supplementary groups. |
f7342052 | 1328 | * These will have been wiped by the above initgroups() call. |
1329 | * Reestablish them here. | |
1330 | */ | |
49e82bb9 | 1331 | if (options.use_pam) { |
1332 | do_pam_session(); | |
7fceb20d | 1333 | do_pam_setcred(0); |
49e82bb9 | 1334 | } |
f7342052 | 1335 | # endif /* USE_PAM */ |
1336 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1337 | irix_setusercontext(pw); | |
1338 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
e2bc41f9 | 1339 | # ifdef _AIX |
0ba40daa | 1340 | aix_usrinfo(pw); |
e2bc41f9 | 1341 | # endif /* _AIX */ |
26d07095 | 1342 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
4c653d8e | 1343 | if (set_id(pw->pw_name) != 0) { |
1344 | exit(1); | |
1345 | } | |
26d07095 | 1346 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ |
f7342052 | 1347 | /* Permanently switch to the desired uid. */ |
1348 | permanently_set_uid(pw); | |
1349 | #endif | |
1350 | } | |
2731632a | 1351 | |
1352 | #ifdef HAVE_CYGWIN | |
1353 | if (is_winnt) | |
1354 | #endif | |
f7342052 | 1355 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1356 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
ef4d1846 | 1357 | |
1358 | #ifdef WITH_SELINUX | |
1359 | ssh_selinux_setup_exec_context(pw->pw_name); | |
1360 | #endif | |
f7342052 | 1361 | } |
1362 | ||
37656beb | 1363 | static void |
1364 | do_pwchange(Session *s) | |
1365 | { | |
be2ca0c9 | 1366 | fflush(NULL); |
37656beb | 1367 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1368 | if (s->ttyfd != -1) { | |
f2107e97 | 1369 | fprintf(stderr, |
37656beb | 1370 | "You must change your password now and login again!\n"); |
3ade3b57 | 1371 | #ifdef PASSWD_NEEDS_USERNAME |
1372 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1373 | (char *)NULL); | |
1374 | #else | |
37656beb | 1375 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
3ade3b57 | 1376 | #endif |
37656beb | 1377 | perror("passwd"); |
1378 | } else { | |
1379 | fprintf(stderr, | |
1380 | "Password change required but no TTY available.\n"); | |
1381 | } | |
1382 | exit(1); | |
1383 | } | |
1384 | ||
51aeb639 | 1385 | static void |
1853d1ef | 1386 | launch_login(struct passwd *pw, const char *hostname) |
1387 | { | |
1388 | /* Launch login(1). */ | |
1389 | ||
85cc9118 | 1390 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1391 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1392 | (s->term ? s->term : "unknown"), |
1853d1ef | 1393 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1394 | #ifdef LOGIN_NO_ENDOPT |
1395 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1396 | #else | |
1853d1ef | 1397 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1398 | #endif |
1853d1ef | 1399 | |
1400 | /* Login couldn't be executed, die. */ | |
1401 | ||
1402 | perror("login"); | |
1403 | exit(1); | |
1404 | } | |
1405 | ||
37656beb | 1406 | static void |
1407 | child_close_fds(void) | |
1408 | { | |
1409 | int i; | |
1410 | ||
1411 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1412 | close(packet_get_connection_in()); | |
1413 | else { | |
1414 | close(packet_get_connection_in()); | |
1415 | close(packet_get_connection_out()); | |
1416 | } | |
1417 | /* | |
1418 | * Close all descriptors related to channels. They will still remain | |
1419 | * open in the parent. | |
1420 | */ | |
1421 | /* XXX better use close-on-exec? -markus */ | |
1422 | channel_close_all(); | |
1423 | ||
1424 | /* | |
1425 | * Close any extra file descriptors. Note that there may still be | |
1426 | * descriptors left by system functions. They will be closed later. | |
1427 | */ | |
1428 | endpwent(); | |
1429 | ||
1430 | /* | |
7b9b0103 | 1431 | * Close any extra open file descriptors so that we don't have them |
37656beb | 1432 | * hanging around in clients. Note that we want to do this after |
1433 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1434 | * descriptors open. | |
1435 | */ | |
1436 | for (i = 3; i < 64; i++) | |
1437 | close(i); | |
1438 | } | |
1439 | ||
f7342052 | 1440 | /* |
1441 | * Performs common processing for the child, such as setting up the | |
1442 | * environment, closing extra file descriptors, setting the user and group | |
1443 | * ids, and executing the command or shell. | |
1444 | */ | |
1445 | void | |
1446 | do_child(Session *s, const char *command) | |
1447 | { | |
1448 | extern char **environ; | |
1449 | char **env; | |
1450 | char *argv[10]; | |
1451 | const char *shell, *shell0, *hostname = NULL; | |
1452 | struct passwd *pw = s->pw; | |
f7342052 | 1453 | |
1454 | /* remove hostkey from the child's memory */ | |
1455 | destroy_sensitive_data(); | |
1456 | ||
37656beb | 1457 | /* Force a password change */ |
1458 | if (s->authctxt->force_pwchange) { | |
1459 | do_setusercontext(pw); | |
1460 | child_close_fds(); | |
1461 | do_pwchange(s); | |
1462 | exit(1); | |
1463 | } | |
1464 | ||
f7342052 | 1465 | /* login(1) is only called if we execute the login shell */ |
1466 | if (options.use_login && command != NULL) | |
1467 | options.use_login = 0; | |
1468 | ||
ef51930f | 1469 | #ifdef _UNICOS |
1470 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1471 | #endif /* _UNICOS */ | |
1472 | ||
f7342052 | 1473 | /* |
1474 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1475 | * switch, so we let login(1) to this for us. | |
1476 | */ | |
1477 | if (!options.use_login) { | |
1478 | #ifdef HAVE_OSF_SIA | |
58d0df4e | 1479 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
f7342052 | 1480 | if (!check_quietlogin(s, command)) |
1481 | do_motd(); | |
1482 | #else /* HAVE_OSF_SIA */ | |
0a61a240 | 1483 | /* When PAM is enabled we rely on it to do the nologin check */ |
1484 | if (!options.use_pam) | |
1485 | do_nologin(pw); | |
f7342052 | 1486 | do_setusercontext(pw); |
25bfd4ff | 1487 | /* |
1488 | * PAM session modules in do_setusercontext may have | |
1489 | * generated messages, so if this in an interactive | |
1490 | * login then display them too. | |
1491 | */ | |
d0c890ac | 1492 | if (!check_quietlogin(s, command)) |
25bfd4ff | 1493 | display_loginmsg(); |
f7342052 | 1494 | #endif /* HAVE_OSF_SIA */ |
1495 | } | |
1496 | ||
abdec250 | 1497 | #ifdef USE_PAM |
d9720710 | 1498 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1499 | debug3("PAM session not opened, exiting"); | |
abdec250 | 1500 | display_loginmsg(); |
1501 | exit(254); | |
1502 | } | |
1503 | #endif | |
1504 | ||
f7342052 | 1505 | /* |
1506 | * Get the shell from the password data. An empty shell field is | |
1507 | * legal, and means /bin/sh. | |
1508 | */ | |
1509 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
32214c88 | 1510 | |
1511 | /* | |
1512 | * Make sure $SHELL points to the shell from the password file, | |
1513 | * even if shell is overridden from login.conf | |
1514 | */ | |
1515 | env = do_setup_env(s, shell); | |
1516 | ||
f7342052 | 1517 | #ifdef HAVE_LOGIN_CAP |
1518 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1519 | #endif | |
1520 | ||
2e73a022 | 1521 | /* we have to stash the hostname before we close our socket. */ |
1522 | if (options.use_login) | |
46e3af7f | 1523 | hostname = get_remote_name_or_ip(utmp_len, |
c5a7d788 | 1524 | options.use_dns); |
7368a6c8 | 1525 | /* |
1526 | * Close the connection descriptors; note that this is the child, and | |
1527 | * the server will still have the socket open, and it is important | |
1528 | * that we do not shutdown it. Note that the descriptors cannot be | |
1529 | * closed before building the environment, as we call | |
1530 | * get_remote_ipaddr there. | |
1531 | */ | |
37656beb | 1532 | child_close_fds(); |
7368a6c8 | 1533 | |
7368a6c8 | 1534 | /* |
2a8a6488 | 1535 | * Must take new environment into use so that .ssh/rc, |
1536 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1537 | */ |
1538 | environ = env; | |
1539 | ||
bcfcc5f9 | 1540 | #if defined(KRB5) && defined(USE_AFS) |
a1e30b47 | 1541 | /* |
1542 | * At this point, we check to see if AFS is active and if we have | |
1543 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1544 | * if we can (and need to) extend the ticket into an AFS token. If | |
1545 | * we don't do this, we run into potential problems if the user's | |
1546 | * home directory is in AFS and it's not world-readable. | |
1547 | */ | |
1548 | ||
1549 | if (options.kerberos_get_afs_token && k_hasafs() && | |
4e2e5cfd | 1550 | (s->authctxt->krb5_ctx != NULL)) { |
a1e30b47 | 1551 | char cell[64]; |
1552 | ||
1553 | debug("Getting AFS token"); | |
1554 | ||
1555 | k_setpag(); | |
1556 | ||
1557 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1558 | krb5_afslog(s->authctxt->krb5_ctx, | |
1559 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1560 | ||
1561 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1562 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1563 | } | |
1564 | #endif | |
1565 | ||
7b9b0103 | 1566 | /* Change current directory to the user's home directory. */ |
dab89049 | 1567 | if (chdir(pw->pw_dir) < 0) { |
1568 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1569 | pw->pw_dir, strerror(errno)); | |
1570 | #ifdef HAVE_LOGIN_CAP | |
1571 | if (login_getcapbool(lc, "requirehome", 0)) | |
1572 | exit(1); | |
1573 | #endif | |
1574 | } | |
1575 | ||
f7342052 | 1576 | if (!options.use_login) |
1577 | do_rc_files(s, shell); | |
1d3c30db | 1578 | |
1579 | /* restore SIGPIPE for child */ | |
1580 | signal(SIGPIPE, SIG_DFL); | |
1581 | ||
f7342052 | 1582 | if (options.use_login) { |
1853d1ef | 1583 | launch_login(pw, hostname); |
1584 | /* NEVERREACHED */ | |
f7342052 | 1585 | } |
1586 | ||
1587 | /* Get the last component of the shell name. */ | |
1588 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1589 | shell0++; | |
1590 | else | |
1591 | shell0 = shell; | |
1592 | ||
7368a6c8 | 1593 | /* |
1594 | * If we have no command, execute the shell. In this case, the shell | |
1595 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1596 | * this is a login shell. | |
1597 | */ | |
1598 | if (!command) { | |
f7342052 | 1599 | char argv0[256]; |
7368a6c8 | 1600 | |
f7342052 | 1601 | /* Start the shell. Set initial character to '-'. */ |
1602 | argv0[0] = '-'; | |
7368a6c8 | 1603 | |
f7342052 | 1604 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1605 | >= sizeof(argv0) - 1) { | |
1606 | errno = EINVAL; | |
7368a6c8 | 1607 | perror(shell); |
1608 | exit(1); | |
f7342052 | 1609 | } |
7368a6c8 | 1610 | |
f7342052 | 1611 | /* Execute the shell. */ |
1612 | argv[0] = argv0; | |
1613 | argv[1] = NULL; | |
1614 | execve(shell, argv, env); | |
7368a6c8 | 1615 | |
f7342052 | 1616 | /* Executing the shell failed. */ |
1617 | perror(shell); | |
1618 | exit(1); | |
7368a6c8 | 1619 | } |
1620 | /* | |
1621 | * Execute the command using the user's shell. This uses the -c | |
1622 | * option to execute the command. | |
1623 | */ | |
f7342052 | 1624 | argv[0] = (char *) shell0; |
7368a6c8 | 1625 | argv[1] = "-c"; |
1626 | argv[2] = (char *) command; | |
1627 | argv[3] = NULL; | |
1628 | execve(shell, argv, env); | |
1629 | perror(shell); | |
1630 | exit(1); | |
1631 | } | |
1632 | ||
1633 | Session * | |
1634 | session_new(void) | |
1635 | { | |
1636 | int i; | |
1637 | static int did_init = 0; | |
1638 | if (!did_init) { | |
1639 | debug("session_new: init"); | |
184eed6a | 1640 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1641 | sessions[i].used = 0; |
7368a6c8 | 1642 | } |
1643 | did_init = 1; | |
1644 | } | |
184eed6a | 1645 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1646 | Session *s = &sessions[i]; |
1647 | if (! s->used) { | |
690d0d7f | 1648 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1649 | s->chanid = -1; |
1650 | s->ptyfd = -1; | |
1651 | s->ttyfd = -1; | |
7368a6c8 | 1652 | s->used = 1; |
86066315 | 1653 | s->self = i; |
d08341e6 | 1654 | s->x11_chanids = NULL; |
02323c45 | 1655 | debug("session_new: session %d", i); |
7368a6c8 | 1656 | return s; |
1657 | } | |
1658 | } | |
1659 | return NULL; | |
1660 | } | |
1661 | ||
396c147e | 1662 | static void |
7368a6c8 | 1663 | session_dump(void) |
1664 | { | |
1665 | int i; | |
184eed6a | 1666 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1667 | Session *s = &sessions[i]; |
c457707e | 1668 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1669 | s->used, |
1670 | s->self, | |
1671 | s, | |
1672 | s->chanid, | |
c457707e | 1673 | (long)s->pid); |
7368a6c8 | 1674 | } |
1675 | } | |
1676 | ||
e78a59f5 | 1677 | int |
57156994 | 1678 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1679 | { |
1680 | Session *s = session_new(); | |
1681 | debug("session_open: channel %d", chanid); | |
1682 | if (s == NULL) { | |
1683 | error("no more sessions"); | |
1684 | return 0; | |
1685 | } | |
57156994 | 1686 | s->authctxt = authctxt; |
1687 | s->pw = authctxt->pw; | |
fdaef11e | 1688 | if (s->pw == NULL || !authctxt->valid) |
0725ea77 | 1689 | fatal("no user for session %d", s->self); |
0b242b12 | 1690 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1691 | s->chanid = chanid; | |
e78a59f5 | 1692 | return 1; |
1693 | } | |
1694 | ||
1853d1ef | 1695 | Session * |
1696 | session_by_tty(char *tty) | |
1697 | { | |
1698 | int i; | |
1699 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1700 | Session *s = &sessions[i]; | |
1701 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1702 | debug("session_by_tty: session %d tty %s", i, tty); | |
1703 | return s; | |
1704 | } | |
1705 | } | |
1706 | debug("session_by_tty: unknown tty %.100s", tty); | |
1707 | session_dump(); | |
1708 | return NULL; | |
1709 | } | |
1710 | ||
396c147e | 1711 | static Session * |
e78a59f5 | 1712 | session_by_channel(int id) |
1713 | { | |
1714 | int i; | |
184eed6a | 1715 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1716 | Session *s = &sessions[i]; |
1717 | if (s->used && s->chanid == id) { | |
1718 | debug("session_by_channel: session %d channel %d", i, id); | |
1719 | return s; | |
1720 | } | |
1721 | } | |
1722 | debug("session_by_channel: unknown channel %d", id); | |
1723 | session_dump(); | |
1724 | return NULL; | |
1725 | } | |
1726 | ||
d08341e6 | 1727 | static Session * |
1728 | session_by_x11_channel(int id) | |
1729 | { | |
1730 | int i, j; | |
1731 | ||
1732 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1733 | Session *s = &sessions[i]; | |
1734 | ||
1735 | if (s->x11_chanids == NULL || !s->used) | |
1736 | continue; | |
1737 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
1738 | if (s->x11_chanids[j] == id) { | |
1739 | debug("session_by_x11_channel: session %d " | |
1740 | "channel %d", s->self, id); | |
1741 | return s; | |
1742 | } | |
1743 | } | |
1744 | } | |
1745 | debug("session_by_x11_channel: unknown channel %d", id); | |
1746 | session_dump(); | |
1747 | return NULL; | |
1748 | } | |
1749 | ||
396c147e | 1750 | static Session * |
e78a59f5 | 1751 | session_by_pid(pid_t pid) |
1752 | { | |
1753 | int i; | |
c457707e | 1754 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1755 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1756 | Session *s = &sessions[i]; |
1757 | if (s->used && s->pid == pid) | |
1758 | return s; | |
1759 | } | |
c457707e | 1760 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1761 | session_dump(); |
1762 | return NULL; | |
1763 | } | |
1764 | ||
396c147e | 1765 | static int |
e78a59f5 | 1766 | session_window_change_req(Session *s) |
1767 | { | |
1768 | s->col = packet_get_int(); | |
1769 | s->row = packet_get_int(); | |
1770 | s->xpixel = packet_get_int(); | |
1771 | s->ypixel = packet_get_int(); | |
95500969 | 1772 | packet_check_eom(); |
e78a59f5 | 1773 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1774 | return 1; | |
1775 | } | |
1776 | ||
396c147e | 1777 | static int |
e78a59f5 | 1778 | session_pty_req(Session *s) |
1779 | { | |
1e3b8b07 | 1780 | u_int len; |
30dcc918 | 1781 | int n_bytes; |
762715ce | 1782 | |
653d5f86 | 1783 | if (no_pty_flag) { |
1784 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1785 | return 0; |
653d5f86 | 1786 | } |
1787 | if (s->ttyfd != -1) { | |
1788 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1789 | return 0; |
653d5f86 | 1790 | } |
1791 | ||
e78a59f5 | 1792 | s->term = packet_get_string(&len); |
653d5f86 | 1793 | |
1794 | if (compat20) { | |
1795 | s->col = packet_get_int(); | |
1796 | s->row = packet_get_int(); | |
1797 | } else { | |
1798 | s->row = packet_get_int(); | |
1799 | s->col = packet_get_int(); | |
1800 | } | |
e78a59f5 | 1801 | s->xpixel = packet_get_int(); |
1802 | s->ypixel = packet_get_int(); | |
1803 | ||
1804 | if (strcmp(s->term, "") == 0) { | |
1805 | xfree(s->term); | |
1806 | s->term = NULL; | |
1807 | } | |
653d5f86 | 1808 | |
e78a59f5 | 1809 | /* Allocate a pty and open it. */ |
653d5f86 | 1810 | debug("Allocating pty."); |
1853d1ef | 1811 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1812 | if (s->term) |
1813 | xfree(s->term); | |
e78a59f5 | 1814 | s->term = NULL; |
1815 | s->ptyfd = -1; | |
1816 | s->ttyfd = -1; | |
1817 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1818 | return 0; |
e78a59f5 | 1819 | } |
1820 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1821 | |
1822 | /* for SSH1 the tty modes length is not given */ | |
1823 | if (!compat20) | |
1824 | n_bytes = packet_remaining(); | |
1825 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1826 | ||
1853d1ef | 1827 | if (!use_privsep) |
1828 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1829 | |
1830 | /* Set window size from the packet. */ | |
e78a59f5 | 1831 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1832 | ||
95500969 | 1833 | packet_check_eom(); |
1d1ffb87 | 1834 | session_proctitle(s); |
e78a59f5 | 1835 | return 1; |
1836 | } | |
1837 | ||
396c147e | 1838 | static int |
0b242b12 | 1839 | session_subsystem_req(Session *s) |
1840 | { | |
01855277 | 1841 | struct stat st; |
1e3b8b07 | 1842 | u_int len; |
0b242b12 | 1843 | int success = 0; |
01855277 | 1844 | char *cmd, *subsys = packet_get_string(&len); |
2ceb8101 | 1845 | u_int i; |
0b242b12 | 1846 | |
95500969 | 1847 | packet_check_eom(); |
bbe88b6d | 1848 | logit("subsystem request for %.100s", subsys); |
0b242b12 | 1849 | |
38c295d6 | 1850 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1851 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
1852 | cmd = options.subsystem_command[i]; | |
1853 | if (stat(cmd, &st) < 0) { | |
1854 | error("subsystem: cannot stat %s: %s", cmd, | |
1855 | strerror(errno)); | |
1856 | break; | |
1857 | } | |
1858 | debug("subsystem: exec() %s", cmd); | |
e5d7a405 | 1859 | s->is_subsystem = 1; |
01855277 | 1860 | do_exec(s, cmd); |
38c295d6 | 1861 | success = 1; |
24932ee9 | 1862 | break; |
38c295d6 | 1863 | } |
1864 | } | |
1865 | ||
1866 | if (!success) | |
bbe88b6d | 1867 | logit("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1868 | subsys); |
38c295d6 | 1869 | |
0b242b12 | 1870 | xfree(subsys); |
1871 | return success; | |
1872 | } | |
1873 | ||
396c147e | 1874 | static int |
0b242b12 | 1875 | session_x11_req(Session *s) |
1876 | { | |
8dcd9d5c | 1877 | int success; |
0b242b12 | 1878 | |
d08341e6 | 1879 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
1880 | error("session_x11_req: session %d: " | |
8918b906 | 1881 | "x11 forwarding already active", s->self); |
d08341e6 | 1882 | return 0; |
1883 | } | |
0b242b12 | 1884 | s->single_connection = packet_get_char(); |
1885 | s->auth_proto = packet_get_string(NULL); | |
1886 | s->auth_data = packet_get_string(NULL); | |
1887 | s->screen = packet_get_int(); | |
95500969 | 1888 | packet_check_eom(); |
0b242b12 | 1889 | |
8dcd9d5c | 1890 | success = session_setup_x11fwd(s); |
1891 | if (!success) { | |
0b242b12 | 1892 | xfree(s->auth_proto); |
1893 | xfree(s->auth_data); | |
1500bcdd | 1894 | s->auth_proto = NULL; |
1895 | s->auth_data = NULL; | |
0b242b12 | 1896 | } |
8dcd9d5c | 1897 | return success; |
0b242b12 | 1898 | } |
1899 | ||
396c147e | 1900 | static int |
38c295d6 | 1901 | session_shell_req(Session *s) |
1902 | { | |
95500969 | 1903 | packet_check_eom(); |
dac6753b | 1904 | do_exec(s, NULL); |
38c295d6 | 1905 | return 1; |
1906 | } | |
1907 | ||
396c147e | 1908 | static int |
38c295d6 | 1909 | session_exec_req(Session *s) |
1910 | { | |
1e3b8b07 | 1911 | u_int len; |
38c295d6 | 1912 | char *command = packet_get_string(&len); |
95500969 | 1913 | packet_check_eom(); |
dac6753b | 1914 | do_exec(s, command); |
c95add71 | 1915 | xfree(command); |
38c295d6 | 1916 | return 1; |
1917 | } | |
1918 | ||
16a79097 | 1919 | static int |
1920 | session_break_req(Session *s) | |
1921 | { | |
16a79097 | 1922 | |
f6be21a0 | 1923 | packet_get_int(); /* ignored */ |
16a79097 | 1924 | packet_check_eom(); |
1925 | ||
8168a86a | 1926 | if (s->ttyfd == -1 || |
1927 | tcsendbreak(s->ttyfd, 0) < 0) | |
16a79097 | 1928 | return 0; |
16a79097 | 1929 | return 1; |
1930 | } | |
1931 | ||
61a2c1da | 1932 | static int |
1933 | session_env_req(Session *s) | |
1934 | { | |
1935 | char *name, *val; | |
1936 | u_int name_len, val_len, i; | |
1937 | ||
1938 | name = packet_get_string(&name_len); | |
1939 | val = packet_get_string(&val_len); | |
1940 | packet_check_eom(); | |
1941 | ||
1942 | /* Don't set too many environment variables */ | |
1943 | if (s->num_env > 128) { | |
1944 | debug2("Ignoring env request %s: too many env vars", name); | |
1945 | goto fail; | |
1946 | } | |
1947 | ||
1948 | for (i = 0; i < options.num_accept_env; i++) { | |
1949 | if (match_pattern(name, options.accept_env[i])) { | |
1950 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
c5d10563 | 1951 | s->env = xrealloc(s->env, s->num_env + 1, |
1952 | sizeof(*s->env)); | |
61a2c1da | 1953 | s->env[s->num_env].name = name; |
1954 | s->env[s->num_env].val = val; | |
1955 | s->num_env++; | |
1956 | return (1); | |
1957 | } | |
1958 | } | |
1959 | debug2("Ignoring env request %s: disallowed name", name); | |
1960 | ||
1961 | fail: | |
1962 | xfree(name); | |
1963 | xfree(val); | |
1964 | return (0); | |
1965 | } | |
1966 | ||
396c147e | 1967 | static int |
fa08c86b | 1968 | session_auth_agent_req(Session *s) |
1969 | { | |
1970 | static int called = 0; | |
95500969 | 1971 | packet_check_eom(); |
d343d900 | 1972 | if (no_agent_forwarding_flag) { |
1973 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1974 | return 0; | |
1975 | } | |
fa08c86b | 1976 | if (called) { |
1977 | return 0; | |
1978 | } else { | |
1979 | called = 1; | |
1980 | return auth_input_request_forwarding(s->pw); | |
1981 | } | |
1982 | } | |
1983 | ||
7899c98f | 1984 | int |
1985 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 1986 | { |
e78a59f5 | 1987 | int success = 0; |
e78a59f5 | 1988 | Session *s; |
e78a59f5 | 1989 | |
7899c98f | 1990 | if ((s = session_by_channel(c->self)) == NULL) { |
bbe88b6d | 1991 | logit("session_input_channel_req: no session %d req %.100s", |
7899c98f | 1992 | c->self, rtype); |
1993 | return 0; | |
1994 | } | |
1995 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 1996 | |
1997 | /* | |
e5d7a405 | 1998 | * a session is in LARVAL state until a shell, a command |
1999 | * or a subsystem is executed | |
e78a59f5 | 2000 | */ |
2001 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2002 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 2003 | success = session_shell_req(s); |
e78a59f5 | 2004 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 2005 | success = session_exec_req(s); |
e78a59f5 | 2006 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 2007 | success = session_pty_req(s); |
0b242b12 | 2008 | } else if (strcmp(rtype, "x11-req") == 0) { |
2009 | success = session_x11_req(s); | |
fa08c86b | 2010 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
2011 | success = session_auth_agent_req(s); | |
0b242b12 | 2012 | } else if (strcmp(rtype, "subsystem") == 0) { |
2013 | success = session_subsystem_req(s); | |
61a2c1da | 2014 | } else if (strcmp(rtype, "env") == 0) { |
2015 | success = session_env_req(s); | |
e78a59f5 | 2016 | } |
2017 | } | |
2018 | if (strcmp(rtype, "window-change") == 0) { | |
2019 | success = session_window_change_req(s); | |
c6c76c99 | 2020 | } else if (strcmp(rtype, "break") == 0) { |
2021 | success = session_break_req(s); | |
e78a59f5 | 2022 | } |
c6c76c99 | 2023 | |
7899c98f | 2024 | return success; |
e78a59f5 | 2025 | } |
2026 | ||
2027 | void | |
2028 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2029 | { | |
2030 | if (!compat20) | |
2031 | fatal("session_set_fds: called for proto != 2.0"); | |
2032 | /* | |
2033 | * now that have a child and a pipe to the child, | |
2034 | * we can activate our channel and register the fd's | |
2035 | */ | |
2036 | if (s->chanid == -1) | |
2037 | fatal("no channel for session %d", s->self); | |
2038 | channel_set_fds(s->chanid, | |
2039 | fdout, fdin, fderr, | |
a22aff1f | 2040 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 2041 | 1, |
2042 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 2043 | } |
2044 | ||
86066315 | 2045 | /* |
2046 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2047 | * (e.g., due to a dropped connection). | |
2048 | */ | |
1853d1ef | 2049 | void |
2362db19 | 2050 | session_pty_cleanup2(Session *s) |
7368a6c8 | 2051 | { |
86066315 | 2052 | if (s == NULL) { |
2053 | error("session_pty_cleanup: no session"); | |
2054 | return; | |
2055 | } | |
2056 | if (s->ttyfd == -1) | |
7368a6c8 | 2057 | return; |
2058 | ||
0725ea77 | 2059 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 2060 | |
7368a6c8 | 2061 | /* Record that the user has logged out. */ |
86066315 | 2062 | if (s->pid != 0) |
f3837bc6 | 2063 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 2064 | |
2065 | /* Release the pseudo-tty. */ | |
1853d1ef | 2066 | if (getuid() == 0) |
2067 | pty_release(s->tty); | |
7368a6c8 | 2068 | |
2069 | /* | |
2070 | * Close the server side of the socket pairs. We must do this after | |
2071 | * the pty cleanup, so that another process doesn't get this pty | |
2072 | * while we're still cleaning up. | |
2073 | */ | |
2074 | if (close(s->ptymaster) < 0) | |
1853d1ef | 2075 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 2076 | |
2077 | /* unlink pty from session */ | |
2078 | s->ttyfd = -1; | |
7368a6c8 | 2079 | } |
e78a59f5 | 2080 | |
1853d1ef | 2081 | void |
2362db19 | 2082 | session_pty_cleanup(Session *s) |
1853d1ef | 2083 | { |
2362db19 | 2084 | PRIVSEP(session_pty_cleanup2(s)); |
1853d1ef | 2085 | } |
2086 | ||
6c723e7c | 2087 | static char * |
2088 | sig2name(int sig) | |
2089 | { | |
2090 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2091 | SSH_SIG(ABRT); | |
2092 | SSH_SIG(ALRM); | |
2093 | SSH_SIG(FPE); | |
2094 | SSH_SIG(HUP); | |
2095 | SSH_SIG(ILL); | |
2096 | SSH_SIG(INT); | |
2097 | SSH_SIG(KILL); | |
2098 | SSH_SIG(PIPE); | |
2099 | SSH_SIG(QUIT); | |
2100 | SSH_SIG(SEGV); | |
2101 | SSH_SIG(TERM); | |
2102 | SSH_SIG(USR1); | |
2103 | SSH_SIG(USR2); | |
2104 | #undef SSH_SIG | |
2105 | return "SIG@openssh.com"; | |
2106 | } | |
2107 | ||
d08341e6 | 2108 | static void |
2109 | session_close_x11(int id) | |
2110 | { | |
2111 | Channel *c; | |
2112 | ||
b872f7f0 | 2113 | if ((c = channel_by_id(id)) == NULL) { |
d08341e6 | 2114 | debug("session_close_x11: x11 channel %d missing", id); |
2115 | } else { | |
2116 | /* Detach X11 listener */ | |
2117 | debug("session_close_x11: detach x11 channel %d", id); | |
2118 | channel_cancel_cleanup(id); | |
2119 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2120 | chan_mark_dead(c); | |
2121 | } | |
2122 | } | |
2123 | ||
2124 | static void | |
2125 | session_close_single_x11(int id, void *arg) | |
2126 | { | |
2127 | Session *s; | |
2128 | u_int i; | |
2129 | ||
2130 | debug3("session_close_single_x11: channel %d", id); | |
2131 | channel_cancel_cleanup(id); | |
2132 | if ((s = session_by_x11_channel(id)) == NULL) | |
2133 | fatal("session_close_single_x11: no x11 channel %d", id); | |
2134 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2135 | debug("session_close_single_x11: session %d: " | |
2136 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2137 | /* | |
2138 | * The channel "id" is already closing, but make sure we | |
2139 | * close all of its siblings. | |
2140 | */ | |
2141 | if (s->x11_chanids[i] != id) | |
2142 | session_close_x11(s->x11_chanids[i]); | |
2143 | } | |
2144 | xfree(s->x11_chanids); | |
2145 | s->x11_chanids = NULL; | |
2146 | if (s->display) { | |
2147 | xfree(s->display); | |
2148 | s->display = NULL; | |
2149 | } | |
2150 | if (s->auth_proto) { | |
2151 | xfree(s->auth_proto); | |
2152 | s->auth_proto = NULL; | |
2153 | } | |
2154 | if (s->auth_data) { | |
2155 | xfree(s->auth_data); | |
2156 | s->auth_data = NULL; | |
2157 | } | |
2158 | if (s->auth_display) { | |
2159 | xfree(s->auth_display); | |
2160 | s->auth_display = NULL; | |
2161 | } | |
2162 | } | |
2163 | ||
396c147e | 2164 | static void |
e78a59f5 | 2165 | session_exit_message(Session *s, int status) |
2166 | { | |
2167 | Channel *c; | |
5a4ae906 | 2168 | |
2169 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 2170 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 2171 | s->self, s->chanid); |
c457707e | 2172 | debug("session_exit_message: session %d channel %d pid %ld", |
2173 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 2174 | |
2175 | if (WIFEXITED(status)) { | |
5a4ae906 | 2176 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 2177 | packet_put_int(WEXITSTATUS(status)); |
2178 | packet_send(); | |
2179 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 2180 | channel_request_start(s->chanid, "exit-signal", 0); |
6c723e7c | 2181 | packet_put_cstring(sig2name(WTERMSIG(status))); |
a64009ad | 2182 | #ifdef WCOREDUMP |
e78a59f5 | 2183 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 2184 | #else /* WCOREDUMP */ |
2185 | packet_put_char(0); | |
2186 | #endif /* WCOREDUMP */ | |
e78a59f5 | 2187 | packet_put_cstring(""); |
2188 | packet_put_cstring(""); | |
2189 | packet_send(); | |
2190 | } else { | |
2191 | /* Some weird exit cause. Just exit. */ | |
2192 | packet_disconnect("wait returned status %04x.", status); | |
2193 | } | |
2194 | ||
2195 | /* disconnect channel */ | |
2196 | debug("session_exit_message: release channel %d", s->chanid); | |
8cd0437d | 2197 | |
2198 | /* | |
2199 | * Adjust cleanup callback attachment to send close messages when | |
b4bbf172 | 2200 | * the channel gets EOF. The session will be then be closed |
8cd0437d | 2201 | * by session_close_by_channel when the childs close their fds. |
2202 | */ | |
2203 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2204 | ||
9da5c3c9 | 2205 | /* |
2206 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2207 | * interested in data we write. | |
2208 | * Note that we must not call 'chan_read_failed', since there could | |
2209 | * be some more data waiting in the pipe. | |
2210 | */ | |
0b242b12 | 2211 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
2212 | chan_write_failed(c); | |
e78a59f5 | 2213 | } |
2214 | ||
1853d1ef | 2215 | void |
86066315 | 2216 | session_close(Session *s) |
e78a59f5 | 2217 | { |
2ceb8101 | 2218 | u_int i; |
61a2c1da | 2219 | |
c457707e | 2220 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
2362db19 | 2221 | if (s->ttyfd != -1) |
86066315 | 2222 | session_pty_cleanup(s); |
e78a59f5 | 2223 | if (s->term) |
2224 | xfree(s->term); | |
2225 | if (s->display) | |
2226 | xfree(s->display); | |
d08341e6 | 2227 | if (s->x11_chanids) |
2228 | xfree(s->x11_chanids); | |
f9314d9a | 2229 | if (s->auth_display) |
2230 | xfree(s->auth_display); | |
e78a59f5 | 2231 | if (s->auth_data) |
2232 | xfree(s->auth_data); | |
2233 | if (s->auth_proto) | |
2234 | xfree(s->auth_proto); | |
2235 | s->used = 0; | |
61a2c1da | 2236 | for (i = 0; i < s->num_env; i++) { |
2237 | xfree(s->env[i].name); | |
2238 | xfree(s->env[i].val); | |
2239 | } | |
2240 | if (s->env != NULL) | |
2241 | xfree(s->env); | |
1d1ffb87 | 2242 | session_proctitle(s); |
e78a59f5 | 2243 | } |
2244 | ||
2245 | void | |
2246 | session_close_by_pid(pid_t pid, int status) | |
2247 | { | |
2248 | Session *s = session_by_pid(pid); | |
2249 | if (s == NULL) { | |
c457707e | 2250 | debug("session_close_by_pid: no session for pid %ld", |
2251 | (long)pid); | |
e78a59f5 | 2252 | return; |
2253 | } | |
2254 | if (s->chanid != -1) | |
2255 | session_exit_message(s, status); | |
8cd0437d | 2256 | if (s->ttyfd != -1) |
2257 | session_pty_cleanup(s); | |
4c721c3d | 2258 | s->pid = 0; |
e78a59f5 | 2259 | } |
2260 | ||
2261 | /* | |
2262 | * this is called when a channel dies before | |
2263 | * the session 'child' itself dies | |
2264 | */ | |
2265 | void | |
2266 | session_close_by_channel(int id, void *arg) | |
2267 | { | |
2268 | Session *s = session_by_channel(id); | |
8cd0437d | 2269 | u_int i; |
d08341e6 | 2270 | |
e78a59f5 | 2271 | if (s == NULL) { |
418e724c | 2272 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 2273 | return; |
2274 | } | |
c457707e | 2275 | debug("session_close_by_channel: channel %d child %ld", |
2276 | id, (long)s->pid); | |
d5f24f94 | 2277 | if (s->pid != 0) { |
418e724c | 2278 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 2279 | /* |
2280 | * delay detach of session, but release pty, since | |
2281 | * the fd's to the child are already closed | |
2282 | */ | |
2362db19 | 2283 | if (s->ttyfd != -1) |
efcc9957 | 2284 | session_pty_cleanup(s); |
418e724c | 2285 | return; |
e78a59f5 | 2286 | } |
418e724c | 2287 | /* detach by removing callback */ |
2288 | channel_cancel_cleanup(s->chanid); | |
8cd0437d | 2289 | |
2290 | /* Close any X11 listeners associated with this session */ | |
2291 | if (s->x11_chanids != NULL) { | |
2292 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2293 | session_close_x11(s->x11_chanids[i]); | |
2294 | s->x11_chanids[i] = -1; | |
2295 | } | |
2296 | } | |
2297 | ||
418e724c | 2298 | s->chanid = -1; |
d5f24f94 | 2299 | session_close(s); |
2300 | } | |
2301 | ||
2302 | void | |
1853d1ef | 2303 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 2304 | { |
2305 | int i; | |
184eed6a | 2306 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 2307 | Session *s = &sessions[i]; |
1853d1ef | 2308 | if (s->used) { |
2309 | if (closefunc != NULL) | |
2310 | closefunc(s); | |
2311 | else | |
2312 | session_close(s); | |
2313 | } | |
d5f24f94 | 2314 | } |
e78a59f5 | 2315 | } |
2316 | ||
396c147e | 2317 | static char * |
1d1ffb87 | 2318 | session_tty_list(void) |
2319 | { | |
2320 | static char buf[1024]; | |
2321 | int i; | |
d0104542 | 2322 | char *cp; |
2323 | ||
1d1ffb87 | 2324 | buf[0] = '\0'; |
184eed6a | 2325 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 2326 | Session *s = &sessions[i]; |
2327 | if (s->used && s->ttyfd != -1) { | |
b6453d99 | 2328 | |
d0104542 | 2329 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2330 | cp = strrchr(s->tty, '/'); | |
2331 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2332 | } else | |
2333 | cp = s->tty + 5; | |
b6453d99 | 2334 | |
1d1ffb87 | 2335 | if (buf[0] != '\0') |
2336 | strlcat(buf, ",", sizeof buf); | |
d0104542 | 2337 | strlcat(buf, cp, sizeof buf); |
1d1ffb87 | 2338 | } |
2339 | } | |
2340 | if (buf[0] == '\0') | |
2341 | strlcpy(buf, "notty", sizeof buf); | |
2342 | return buf; | |
2343 | } | |
2344 | ||
2345 | void | |
2346 | session_proctitle(Session *s) | |
2347 | { | |
2348 | if (s->pw == NULL) | |
2349 | error("no user for session %d", s->self); | |
2350 | else | |
2351 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2352 | } | |
2353 | ||
8dcd9d5c | 2354 | int |
2355 | session_setup_x11fwd(Session *s) | |
2356 | { | |
8dcd9d5c | 2357 | struct stat st; |
c9d0ad9b | 2358 | char display[512], auth_display[512]; |
2359 | char hostname[MAXHOSTNAMELEN]; | |
d08341e6 | 2360 | u_int i; |
8dcd9d5c | 2361 | |
2362 | if (no_x11_forwarding_flag) { | |
2363 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2364 | return 0; | |
2365 | } | |
2366 | if (!options.x11_forwarding) { | |
2367 | debug("X11 forwarding disabled in server configuration file."); | |
2368 | return 0; | |
2369 | } | |
2370 | if (!options.xauth_location || | |
2371 | (stat(options.xauth_location, &st) == -1)) { | |
2372 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2373 | return 0; | |
2374 | } | |
ff027d84 | 2375 | if (options.use_login) { |
2376 | packet_send_debug("X11 forwarding disabled; " | |
2377 | "not compatible with UseLogin=yes."); | |
2378 | return 0; | |
2379 | } | |
b44de2b1 | 2380 | if (s->display != NULL) { |
8dcd9d5c | 2381 | debug("X11 display already set."); |
2382 | return 0; | |
2383 | } | |
57f228e8 | 2384 | if (x11_create_display_inet(options.x11_display_offset, |
2385 | options.x11_use_localhost, s->single_connection, | |
d08341e6 | 2386 | &s->display_number, &s->x11_chanids) == -1) { |
b44de2b1 | 2387 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 2388 | return 0; |
2389 | } | |
d08341e6 | 2390 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2391 | channel_register_cleanup(s->x11_chanids[i], | |
8cd0437d | 2392 | session_close_single_x11, 0); |
d08341e6 | 2393 | } |
c9d0ad9b | 2394 | |
2395 | /* Set up a suitable value for the DISPLAY variable. */ | |
2396 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2397 | fatal("gethostname: %.100s", strerror(errno)); | |
2398 | /* | |
2399 | * auth_display must be used as the displayname when the | |
2400 | * authorization entry is added with xauth(1). This will be | |
2401 | * different than the DISPLAY string for localhost displays. | |
2402 | */ | |
e6e573bd | 2403 | if (options.x11_use_localhost) { |
57f228e8 | 2404 | snprintf(display, sizeof display, "localhost:%u.%u", |
c9d0ad9b | 2405 | s->display_number, s->screen); |
57f228e8 | 2406 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
f9314d9a | 2407 | s->display_number, s->screen); |
c9d0ad9b | 2408 | s->display = xstrdup(display); |
f9314d9a | 2409 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 2410 | } else { |
2411 | #ifdef IPADDR_IN_DISPLAY | |
2412 | struct hostent *he; | |
2413 | struct in_addr my_addr; | |
2414 | ||
2415 | he = gethostbyname(hostname); | |
2416 | if (he == NULL) { | |
2417 | error("Can't get IP address for X11 DISPLAY."); | |
2418 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2419 | return 0; | |
2420 | } | |
2421 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
57f228e8 | 2422 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
c9d0ad9b | 2423 | s->display_number, s->screen); |
2424 | #else | |
57f228e8 | 2425 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
c9d0ad9b | 2426 | s->display_number, s->screen); |
2427 | #endif | |
2428 | s->display = xstrdup(display); | |
f9314d9a | 2429 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2430 | } |
2431 | ||
8dcd9d5c | 2432 | return 1; |
2433 | } | |
2434 | ||
396c147e | 2435 | static void |
59c97189 | 2436 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2437 | { |
57156994 | 2438 | server_loop2(authctxt); |
2362db19 | 2439 | } |
2440 | ||
2441 | void | |
2442 | do_cleanup(Authctxt *authctxt) | |
2443 | { | |
2444 | static int called = 0; | |
2445 | ||
2446 | debug("do_cleanup"); | |
2447 | ||
2448 | /* no cleanup if we're in the child for login shell */ | |
2449 | if (is_child) | |
2450 | return; | |
2451 | ||
2452 | /* avoid double cleanup */ | |
2453 | if (called) | |
2454 | return; | |
2455 | called = 1; | |
2456 | ||
2457 | if (authctxt == NULL) | |
2458 | return; | |
2459 | #ifdef KRB5 | |
2460 | if (options.kerberos_ticket_cleanup && | |
2461 | authctxt->krb5_ctx) | |
2462 | krb5_cleanup_proc(authctxt); | |
7364bd04 | 2463 | #endif |
2362db19 | 2464 | |
2465 | #ifdef GSSAPI | |
2466 | if (compat20 && options.gss_cleanup_creds) | |
2467 | ssh_gssapi_cleanup_creds(); | |
2468 | #endif | |
2469 | ||
c6630044 | 2470 | #ifdef USE_PAM |
2471 | if (options.use_pam) { | |
2472 | sshpam_cleanup(); | |
2473 | sshpam_thread_cleanup(); | |
2474 | } | |
2475 | #endif | |
2476 | ||
2362db19 | 2477 | /* remove agent socket */ |
2478 | auth_sock_cleanup_proc(authctxt->pw); | |
2479 | ||
2480 | /* | |
2481 | * Cleanup ptys/utmp only if privsep is disabled, | |
2482 | * or if running in monitor. | |
2483 | */ | |
2484 | if (!use_privsep || mm_is_monitor()) | |
2485 | session_destroy_all(session_pty_cleanup2); | |
e78a59f5 | 2486 | } |