]>
Commit | Line | Data |
---|---|---|
5156b1a1 | 1 | /* $OpenBSD: session.c,v 1.241 2008/06/16 13:22:53 dtucker Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
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 | * | |
12 | * SSH2 support by Markus Friedl. | |
13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. | |
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. | |
34 | */ | |
35 | ||
36 | #include "includes.h" | |
3c0ef626 | 37 | |
30460aeb | 38 | #include <sys/types.h> |
39 | #include <sys/param.h> | |
40 | #ifdef HAVE_SYS_STAT_H | |
41 | # include <sys/stat.h> | |
42 | #endif | |
43 | #include <sys/socket.h> | |
44 | #include <sys/un.h> | |
45 | #include <sys/wait.h> | |
46 | ||
47 | #include <arpa/inet.h> | |
48 | ||
49 | #include <errno.h> | |
50 | #include <grp.h> | |
51 | #ifdef HAVE_PATHS_H | |
52 | #include <paths.h> | |
53 | #endif | |
54 | #include <pwd.h> | |
55 | #include <signal.h> | |
56 | #include <stdarg.h> | |
57 | #include <stdio.h> | |
58 | #include <stdlib.h> | |
59 | #include <string.h> | |
60 | #include <unistd.h> | |
61 | ||
5156b1a1 | 62 | #include "openbsd-compat/sys-queue.h" |
30460aeb | 63 | #include "xmalloc.h" |
3c0ef626 | 64 | #include "ssh.h" |
65 | #include "ssh1.h" | |
66 | #include "ssh2.h" | |
3c0ef626 | 67 | #include "sshpty.h" |
68 | #include "packet.h" | |
69 | #include "buffer.h" | |
7e82606e | 70 | #include "match.h" |
3c0ef626 | 71 | #include "uidswap.h" |
72 | #include "compat.h" | |
73 | #include "channels.h" | |
30460aeb | 74 | #include "key.h" |
75 | #include "cipher.h" | |
76 | #ifdef GSSAPI | |
77 | #include "ssh-gss.h" | |
78 | #endif | |
79 | #include "hostfile.h" | |
3c0ef626 | 80 | #include "auth.h" |
81 | #include "auth-options.h" | |
82 | #include "pathnames.h" | |
83 | #include "log.h" | |
84 | #include "servconf.h" | |
85 | #include "sshlogin.h" | |
86 | #include "serverloop.h" | |
87 | #include "canohost.h" | |
e74dc197 | 88 | #include "misc.h" |
3c0ef626 | 89 | #include "session.h" |
2ce0bfe4 | 90 | #include "kex.h" |
350391c5 | 91 | #include "monitor_wrap.h" |
e74dc197 | 92 | #include "sftp.h" |
3c0ef626 | 93 | |
540d72c3 | 94 | #if defined(KRB5) && defined(USE_AFS) |
95 | #include <kafs.h> | |
96 | #endif | |
97 | ||
3c0ef626 | 98 | /* func */ |
99 | ||
100 | Session *session_new(void); | |
5156b1a1 | 101 | void session_set_fds(Session *, int, int, int, int); |
540d72c3 | 102 | void session_pty_cleanup(Session *); |
3c0ef626 | 103 | void session_proctitle(Session *); |
104 | int session_setup_x11fwd(Session *); | |
5156b1a1 | 105 | int do_exec_pty(Session *, const char *); |
106 | int do_exec_no_pty(Session *, const char *); | |
107 | int do_exec(Session *, const char *); | |
3c0ef626 | 108 | void do_login(Session *, const char *); |
109 | #ifdef LOGIN_NEEDS_UTMPX | |
110 | static void do_pre_login(Session *s); | |
111 | #endif | |
112 | void do_child(Session *, const char *); | |
113 | void do_motd(void); | |
114 | int check_quietlogin(Session *, const char *); | |
115 | ||
116 | static void do_authenticated1(Authctxt *); | |
117 | static void do_authenticated2(Authctxt *); | |
118 | ||
3c0ef626 | 119 | static int session_pty_req(Session *); |
120 | ||
75be3237 | 121 | #ifdef SESSION_HOOKS |
122 | static void execute_session_hook(char* prog, Authctxt *authctxt, | |
123 | int startup, int save); | |
124 | #endif | |
125 | ||
3c0ef626 | 126 | /* import */ |
127 | extern ServerOptions options; | |
128 | extern char *__progname; | |
129 | extern int log_stderr; | |
130 | extern int debug_flag; | |
131 | extern u_int utmp_len; | |
132 | extern int startup_pipe; | |
133 | extern void destroy_sensitive_data(void); | |
7cac2b65 | 134 | extern Buffer loginmsg; |
3c0ef626 | 135 | |
136 | /* original command from peer. */ | |
137 | const char *original_command = NULL; | |
138 | ||
139 | /* data */ | |
5156b1a1 | 140 | static int sessions_first_unused = -1; |
141 | static int sessions_nalloc = 0; | |
142 | static Session *sessions = NULL; | |
3c0ef626 | 143 | |
e74dc197 | 144 | #define SUBSYSTEM_NONE 0 |
145 | #define SUBSYSTEM_EXT 1 | |
146 | #define SUBSYSTEM_INT_SFTP 2 | |
147 | ||
3c0ef626 | 148 | #ifdef HAVE_LOGIN_CAP |
350391c5 | 149 | login_cap_t *lc; |
3c0ef626 | 150 | #endif |
151 | ||
540d72c3 | 152 | static int is_child = 0; |
153 | ||
44a053a3 | 154 | /* Name and directory of socket for authentication agent forwarding. */ |
155 | static char *auth_sock_name = NULL; | |
156 | static char *auth_sock_dir = NULL; | |
157 | ||
158 | /* removes the agent forwarding socket */ | |
159 | ||
160 | static void | |
540d72c3 | 161 | auth_sock_cleanup_proc(struct passwd *pw) |
44a053a3 | 162 | { |
44a053a3 | 163 | if (auth_sock_name != NULL) { |
164 | temporarily_use_uid(pw); | |
165 | unlink(auth_sock_name); | |
166 | rmdir(auth_sock_dir); | |
167 | auth_sock_name = NULL; | |
168 | restore_uid(); | |
169 | } | |
170 | } | |
171 | ||
172 | static int | |
173 | auth_input_request_forwarding(struct passwd * pw) | |
174 | { | |
175 | Channel *nc; | |
5156b1a1 | 176 | int sock = -1; |
44a053a3 | 177 | struct sockaddr_un sunaddr; |
178 | ||
179 | if (auth_sock_name != NULL) { | |
180 | error("authentication forwarding requested twice."); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
185 | temporarily_use_uid(pw); | |
186 | ||
187 | /* Allocate a buffer for the socket name, and format the name. */ | |
5156b1a1 | 188 | auth_sock_dir = xstrdup("/tmp/ssh-XXXXXXXXXX"); |
44a053a3 | 189 | |
190 | /* Create private directory for socket */ | |
191 | if (mkdtemp(auth_sock_dir) == NULL) { | |
192 | packet_send_debug("Agent forwarding disabled: " | |
193 | "mkdtemp() failed: %.100s", strerror(errno)); | |
194 | restore_uid(); | |
44a053a3 | 195 | xfree(auth_sock_dir); |
44a053a3 | 196 | auth_sock_dir = NULL; |
5156b1a1 | 197 | goto authsock_err; |
44a053a3 | 198 | } |
5156b1a1 | 199 | |
200 | xasprintf(&auth_sock_name, "%s/agent.%ld", | |
201 | auth_sock_dir, (long) getpid()); | |
44a053a3 | 202 | |
44a053a3 | 203 | /* Create the socket. */ |
204 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
5156b1a1 | 205 | if (sock < 0) { |
206 | error("socket: %.100s", strerror(errno)); | |
207 | restore_uid(); | |
208 | goto authsock_err; | |
209 | } | |
44a053a3 | 210 | |
211 | /* Bind it to the name. */ | |
212 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
213 | sunaddr.sun_family = AF_UNIX; | |
214 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
215 | ||
5156b1a1 | 216 | if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) { |
217 | error("bind: %.100s", strerror(errno)); | |
218 | restore_uid(); | |
219 | goto authsock_err; | |
220 | } | |
44a053a3 | 221 | |
222 | /* Restore the privileged uid. */ | |
223 | restore_uid(); | |
224 | ||
225 | /* Start listening on the socket. */ | |
5156b1a1 | 226 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
227 | error("listen: %.100s", strerror(errno)); | |
228 | goto authsock_err; | |
229 | } | |
44a053a3 | 230 | |
231 | /* Allocate a channel for the authentication agent socket. */ | |
a7213e65 | 232 | /* this shouldn't matter if its hpn or not - cjr */ |
44a053a3 | 233 | nc = channel_new("auth socket", |
234 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
235 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
7cac2b65 | 236 | 0, "auth socket", 1); |
44a053a3 | 237 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
238 | return 1; | |
5156b1a1 | 239 | |
240 | authsock_err: | |
241 | if (auth_sock_name != NULL) | |
242 | xfree(auth_sock_name); | |
243 | if (auth_sock_dir != NULL) { | |
244 | rmdir(auth_sock_dir); | |
245 | xfree(auth_sock_dir); | |
246 | } | |
247 | if (sock != -1) | |
248 | close(sock); | |
249 | auth_sock_name = NULL; | |
250 | auth_sock_dir = NULL; | |
251 | return 0; | |
44a053a3 | 252 | } |
253 | ||
540d72c3 | 254 | static void |
255 | display_loginmsg(void) | |
256 | { | |
2ce0bfe4 | 257 | if (buffer_len(&loginmsg) > 0) { |
258 | buffer_append(&loginmsg, "\0", 1); | |
259 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
260 | buffer_clear(&loginmsg); | |
261 | } | |
540d72c3 | 262 | } |
44a053a3 | 263 | |
3c0ef626 | 264 | void |
265 | do_authenticated(Authctxt *authctxt) | |
266 | { | |
bfe49944 | 267 | setproctitle("%s", authctxt->pw->pw_name); |
268 | ||
3c0ef626 | 269 | /* setup the channel layer */ |
270 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
271 | channel_permit_all_opens(); | |
272 | ||
273 | if (compat20) | |
274 | do_authenticated2(authctxt); | |
275 | else | |
276 | do_authenticated1(authctxt); | |
277 | ||
75be3237 | 278 | #ifdef SESSION_HOOKS |
279 | if (options.session_hooks_allow && | |
280 | options.session_hooks_shutdown_cmd) | |
281 | { | |
282 | execute_session_hook(options.session_hooks_shutdown_cmd, | |
283 | authctxt, | |
284 | /* startup = */ 0, /* save = */ 0); | |
285 | ||
286 | if (authctxt->session_env_file) | |
287 | { | |
288 | free(authctxt->session_env_file); | |
289 | } | |
290 | } | |
291 | #endif | |
540d72c3 | 292 | |
293 | do_cleanup(authctxt); | |
3c0ef626 | 294 | } |
295 | ||
296 | /* | |
297 | * Prepares for an interactive session. This is called after the user has | |
298 | * been successfully authenticated. During this message exchange, pseudo | |
299 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
300 | * are requested, etc. | |
301 | */ | |
302 | static void | |
303 | do_authenticated1(Authctxt *authctxt) | |
304 | { | |
305 | Session *s; | |
306 | char *command; | |
e9702f7d | 307 | int success, type, screen_flag; |
276b07a3 | 308 | int enable_compression_after_reply = 0; |
309 | u_int proto_len, data_len, dlen, compression_level = 0; | |
3c0ef626 | 310 | |
311 | s = session_new(); | |
dfddba3d | 312 | if (s == NULL) { |
313 | error("no more sessions"); | |
314 | return; | |
315 | } | |
3c0ef626 | 316 | s->authctxt = authctxt; |
317 | s->pw = authctxt->pw; | |
318 | ||
319 | /* | |
320 | * We stay in this loop until the client requests to execute a shell | |
321 | * or a command. | |
322 | */ | |
323 | for (;;) { | |
324 | success = 0; | |
325 | ||
326 | /* Get a packet from the client. */ | |
e9702f7d | 327 | type = packet_read(); |
3c0ef626 | 328 | |
329 | /* Process the packet. */ | |
330 | switch (type) { | |
331 | case SSH_CMSG_REQUEST_COMPRESSION: | |
3c0ef626 | 332 | compression_level = packet_get_int(); |
e9702f7d | 333 | packet_check_eom(); |
3c0ef626 | 334 | if (compression_level < 1 || compression_level > 9) { |
7e82606e | 335 | packet_send_debug("Received invalid compression level %d.", |
e9702f7d | 336 | compression_level); |
3c0ef626 | 337 | break; |
338 | } | |
2ce0bfe4 | 339 | if (options.compression == COMP_NONE) { |
44a053a3 | 340 | debug2("compression disabled"); |
341 | break; | |
342 | } | |
3c0ef626 | 343 | /* Enable compression after we have responded with SUCCESS. */ |
344 | enable_compression_after_reply = 1; | |
345 | success = 1; | |
346 | break; | |
347 | ||
348 | case SSH_CMSG_REQUEST_PTY: | |
349 | success = session_pty_req(s); | |
350 | break; | |
351 | ||
352 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
353 | s->auth_proto = packet_get_string(&proto_len); | |
354 | s->auth_data = packet_get_string(&data_len); | |
355 | ||
356 | screen_flag = packet_get_protocol_flags() & | |
357 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
358 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
359 | ||
360 | if (packet_remaining() == 4) { | |
361 | if (!screen_flag) | |
362 | debug2("Buggy client: " | |
363 | "X11 screen flag missing"); | |
364 | s->screen = packet_get_int(); | |
365 | } else { | |
366 | s->screen = 0; | |
367 | } | |
e9702f7d | 368 | packet_check_eom(); |
3c0ef626 | 369 | success = session_setup_x11fwd(s); |
370 | if (!success) { | |
371 | xfree(s->auth_proto); | |
372 | xfree(s->auth_data); | |
373 | s->auth_proto = NULL; | |
374 | s->auth_data = NULL; | |
375 | } | |
376 | break; | |
377 | ||
378 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
5156b1a1 | 379 | if (!options.allow_agent_forwarding || |
380 | no_agent_forwarding_flag || compat13) { | |
3c0ef626 | 381 | debug("Authentication agent forwarding not permitted for this authentication."); |
382 | break; | |
383 | } | |
384 | debug("Received authentication agent forwarding request."); | |
385 | success = auth_input_request_forwarding(s->pw); | |
386 | break; | |
387 | ||
388 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
389 | if (no_port_forwarding_flag) { | |
390 | debug("Port forwarding not permitted for this authentication."); | |
391 | break; | |
392 | } | |
393 | if (!options.allow_tcp_forwarding) { | |
394 | debug("Port forwarding not permitted."); | |
395 | break; | |
396 | } | |
397 | debug("Received TCP/IP port forwarding request."); | |
30460aeb | 398 | if (channel_input_port_forward_request(s->pw->pw_uid == 0, |
f713db99 | 399 | options.gateway_ports, options.hpn_disabled, |
400 | options.hpn_buffer_size) < 0) { | |
30460aeb | 401 | debug("Port forwarding failed."); |
402 | break; | |
403 | } | |
3c0ef626 | 404 | success = 1; |
405 | break; | |
406 | ||
407 | case SSH_CMSG_MAX_PACKET_SIZE: | |
408 | if (packet_set_maxsize(packet_get_int()) > 0) | |
409 | success = 1; | |
410 | break; | |
e9702f7d | 411 | |
3c0ef626 | 412 | case SSH_CMSG_EXEC_SHELL: |
413 | case SSH_CMSG_EXEC_CMD: | |
414 | if (type == SSH_CMSG_EXEC_CMD) { | |
415 | command = packet_get_string(&dlen); | |
416 | debug("Exec command '%.500s'", command); | |
5156b1a1 | 417 | if (do_exec(s, command) != 0) |
418 | packet_disconnect( | |
419 | "command execution failed"); | |
3c0ef626 | 420 | xfree(command); |
421 | } else { | |
5156b1a1 | 422 | if (do_exec(s, NULL) != 0) |
423 | packet_disconnect( | |
424 | "shell execution failed"); | |
3c0ef626 | 425 | } |
e9702f7d | 426 | packet_check_eom(); |
3c0ef626 | 427 | session_close(s); |
428 | return; | |
429 | ||
430 | default: | |
431 | /* | |
432 | * Any unknown messages in this phase are ignored, | |
433 | * and a failure message is returned. | |
434 | */ | |
7cac2b65 | 435 | logit("Unknown packet type received after authentication: %d", type); |
3c0ef626 | 436 | } |
437 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
438 | packet_send(); | |
439 | packet_write_wait(); | |
440 | ||
441 | /* Enable compression now that we have replied if appropriate. */ | |
442 | if (enable_compression_after_reply) { | |
443 | enable_compression_after_reply = 0; | |
444 | packet_start_compression(compression_level); | |
445 | } | |
446 | } | |
447 | } | |
448 | ||
5156b1a1 | 449 | #define USE_PIPES |
3c0ef626 | 450 | /* |
451 | * This is called to fork and execute a command when we have no tty. This | |
452 | * will call do_child from the child, and server_loop from the parent after | |
453 | * setting up file descriptors and such. | |
454 | */ | |
5156b1a1 | 455 | int |
3c0ef626 | 456 | do_exec_no_pty(Session *s, const char *command) |
457 | { | |
44a053a3 | 458 | pid_t pid; |
3c0ef626 | 459 | |
460 | #ifdef USE_PIPES | |
461 | int pin[2], pout[2], perr[2]; | |
5156b1a1 | 462 | |
3c0ef626 | 463 | /* Allocate pipes for communicating with the program. */ |
5156b1a1 | 464 | if (pipe(pin) < 0) { |
465 | error("%s: pipe in: %.100s", __func__, strerror(errno)); | |
466 | return -1; | |
467 | } | |
468 | if (pipe(pout) < 0) { | |
469 | error("%s: pipe out: %.100s", __func__, strerror(errno)); | |
470 | close(pin[0]); | |
471 | close(pin[1]); | |
472 | return -1; | |
473 | } | |
474 | if (pipe(perr) < 0) { | |
475 | error("%s: pipe err: %.100s", __func__, strerror(errno)); | |
476 | close(pin[0]); | |
477 | close(pin[1]); | |
478 | close(pout[0]); | |
479 | close(pout[1]); | |
480 | return -1; | |
481 | } | |
482 | #else | |
3c0ef626 | 483 | int inout[2], err[2]; |
5156b1a1 | 484 | |
3c0ef626 | 485 | /* Uses socket pairs to communicate with the program. */ |
5156b1a1 | 486 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0) { |
487 | error("%s: socketpair #1: %.100s", __func__, strerror(errno)); | |
488 | return -1; | |
489 | } | |
490 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) { | |
491 | error("%s: socketpair #2: %.100s", __func__, strerror(errno)); | |
492 | close(inout[0]); | |
493 | close(inout[1]); | |
494 | return -1; | |
495 | } | |
496 | #endif | |
497 | ||
3c0ef626 | 498 | if (s == NULL) |
499 | fatal("do_exec_no_pty: no session"); | |
500 | ||
501 | session_proctitle(s); | |
502 | ||
3c0ef626 | 503 | /* Fork the child. */ |
5156b1a1 | 504 | switch ((pid = fork())) { |
505 | case -1: | |
506 | error("%s: fork: %.100s", __func__, strerror(errno)); | |
507 | #ifdef USE_PIPES | |
508 | close(pin[0]); | |
509 | close(pin[1]); | |
510 | close(pout[0]); | |
511 | close(pout[1]); | |
512 | close(perr[0]); | |
513 | close(perr[1]); | |
514 | #else | |
515 | close(inout[0]); | |
516 | close(inout[1]); | |
517 | close(err[0]); | |
518 | close(err[1]); | |
519 | #endif | |
520 | return -1; | |
521 | case 0: | |
540d72c3 | 522 | is_child = 1; |
d03f4262 | 523 | |
3c0ef626 | 524 | /* Child. Reinitialize the log since the pid has changed. */ |
5156b1a1 | 525 | log_init(__progname, options.log_level, |
526 | options.log_facility, log_stderr); | |
3c0ef626 | 527 | |
528 | /* | |
529 | * Create a new session and process group since the 4.4BSD | |
530 | * setlogin() affects the entire process group. | |
531 | */ | |
532 | if (setsid() < 0) | |
533 | error("setsid failed: %.100s", strerror(errno)); | |
534 | ||
535 | #ifdef USE_PIPES | |
536 | /* | |
537 | * Redirect stdin. We close the parent side of the socket | |
538 | * pair, and make the child side the standard input. | |
539 | */ | |
540 | close(pin[1]); | |
541 | if (dup2(pin[0], 0) < 0) | |
542 | perror("dup2 stdin"); | |
543 | close(pin[0]); | |
544 | ||
545 | /* Redirect stdout. */ | |
546 | close(pout[0]); | |
547 | if (dup2(pout[1], 1) < 0) | |
548 | perror("dup2 stdout"); | |
549 | close(pout[1]); | |
550 | ||
551 | /* Redirect stderr. */ | |
552 | close(perr[0]); | |
553 | if (dup2(perr[1], 2) < 0) | |
554 | perror("dup2 stderr"); | |
555 | close(perr[1]); | |
5156b1a1 | 556 | #else |
3c0ef626 | 557 | /* |
558 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
559 | * use the same socket, as some programs (particularly rdist) | |
560 | * seem to depend on it. | |
561 | */ | |
562 | close(inout[1]); | |
563 | close(err[1]); | |
564 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
565 | perror("dup2 stdin"); | |
5156b1a1 | 566 | if (dup2(inout[0], 1) < 0) /* stdout (same as stdin) */ |
3c0ef626 | 567 | perror("dup2 stdout"); |
5156b1a1 | 568 | close(inout[0]); |
3c0ef626 | 569 | if (dup2(err[0], 2) < 0) /* stderr */ |
570 | perror("dup2 stderr"); | |
5156b1a1 | 571 | close(err[0]); |
572 | #endif | |
573 | ||
3c0ef626 | 574 | |
d03f4262 | 575 | #ifdef _UNICOS |
576 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
577 | #endif | |
578 | ||
3c0ef626 | 579 | /* Do processing for the child (exec command etc). */ |
580 | do_child(s, command); | |
581 | /* NOTREACHED */ | |
5156b1a1 | 582 | default: |
583 | break; | |
3c0ef626 | 584 | } |
5156b1a1 | 585 | |
d03f4262 | 586 | #ifdef _UNICOS |
587 | signal(WJSIGNAL, cray_job_termination_handler); | |
588 | #endif /* _UNICOS */ | |
3c0ef626 | 589 | #ifdef HAVE_CYGWIN |
590 | if (is_winnt) | |
591 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
592 | #endif | |
5156b1a1 | 593 | |
3c0ef626 | 594 | s->pid = pid; |
595 | /* Set interactive/non-interactive mode. */ | |
596 | packet_set_interactive(s->display != NULL); | |
5156b1a1 | 597 | |
598 | /* | |
599 | * Clear loginmsg, since it's the child's responsibility to display | |
600 | * it to the user, otherwise multiple sessions may accumulate | |
601 | * multiple copies of the login messages. | |
602 | */ | |
603 | buffer_clear(&loginmsg); | |
604 | ||
3c0ef626 | 605 | #ifdef USE_PIPES |
606 | /* We are the parent. Close the child sides of the pipes. */ | |
607 | close(pin[0]); | |
608 | close(pout[1]); | |
609 | close(perr[1]); | |
610 | ||
611 | if (compat20) { | |
7e82606e | 612 | if (s->is_subsystem) { |
613 | close(perr[0]); | |
614 | perr[0] = -1; | |
615 | } | |
5156b1a1 | 616 | session_set_fds(s, pin[1], pout[0], perr[0], 0); |
3c0ef626 | 617 | } else { |
618 | /* Enter the interactive session. */ | |
619 | server_loop(pid, pin[1], pout[0], perr[0]); | |
620 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ | |
621 | } | |
5156b1a1 | 622 | #else |
3c0ef626 | 623 | /* We are the parent. Close the child sides of the socket pairs. */ |
624 | close(inout[0]); | |
625 | close(err[0]); | |
626 | ||
627 | /* | |
628 | * Enter the interactive session. Note: server_loop must be able to | |
629 | * handle the case that fdin and fdout are the same. | |
630 | */ | |
631 | if (compat20) { | |
5156b1a1 | 632 | session_set_fds(s, inout[1], inout[1], |
633 | s->is_subsystem ? -1 : err[1], 0); | |
634 | if (s->is_subsystem) | |
635 | close(err[1]); | |
3c0ef626 | 636 | } else { |
637 | server_loop(pid, inout[1], inout[1], err[1]); | |
638 | /* server_loop has closed inout[1] and err[1]. */ | |
639 | } | |
5156b1a1 | 640 | #endif |
641 | return 0; | |
3c0ef626 | 642 | } |
643 | ||
644 | /* | |
645 | * This is called to fork and execute a command when we have a tty. This | |
646 | * will call do_child from the child, and server_loop from the parent after | |
647 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
648 | * lastlog, and other such operations. | |
649 | */ | |
5156b1a1 | 650 | int |
3c0ef626 | 651 | do_exec_pty(Session *s, const char *command) |
652 | { | |
653 | int fdout, ptyfd, ttyfd, ptymaster; | |
654 | pid_t pid; | |
655 | ||
656 | if (s == NULL) | |
657 | fatal("do_exec_pty: no session"); | |
658 | ptyfd = s->ptyfd; | |
659 | ttyfd = s->ttyfd; | |
660 | ||
5156b1a1 | 661 | /* |
662 | * Create another descriptor of the pty master side for use as the | |
663 | * standard input. We could use the original descriptor, but this | |
664 | * simplifies code in server_loop. The descriptor is bidirectional. | |
665 | * Do this before forking (and cleanup in the child) so as to | |
666 | * detect and gracefully fail out-of-fd conditions. | |
667 | */ | |
668 | if ((fdout = dup(ptyfd)) < 0) { | |
669 | error("%s: dup #1: %s", __func__, strerror(errno)); | |
670 | close(ttyfd); | |
671 | close(ptyfd); | |
672 | return -1; | |
673 | } | |
674 | /* we keep a reference to the pty master */ | |
675 | if ((ptymaster = dup(ptyfd)) < 0) { | |
676 | error("%s: dup #2: %s", __func__, strerror(errno)); | |
677 | close(ttyfd); | |
678 | close(ptyfd); | |
679 | close(fdout); | |
680 | return -1; | |
681 | } | |
682 | ||
3c0ef626 | 683 | /* Fork the child. */ |
5156b1a1 | 684 | switch ((pid = fork())) { |
685 | case -1: | |
686 | error("%s: fork: %.100s", __func__, strerror(errno)); | |
687 | close(fdout); | |
688 | close(ptymaster); | |
689 | close(ttyfd); | |
690 | close(ptyfd); | |
691 | return -1; | |
692 | case 0: | |
540d72c3 | 693 | is_child = 1; |
3c0ef626 | 694 | |
5156b1a1 | 695 | close(fdout); |
696 | close(ptymaster); | |
697 | ||
3c0ef626 | 698 | /* Child. Reinitialize the log because the pid has changed. */ |
5156b1a1 | 699 | log_init(__progname, options.log_level, |
700 | options.log_facility, log_stderr); | |
3c0ef626 | 701 | /* Close the master side of the pseudo tty. */ |
702 | close(ptyfd); | |
703 | ||
704 | /* Make the pseudo tty our controlling tty. */ | |
705 | pty_make_controlling_tty(&ttyfd, s->tty); | |
706 | ||
707 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ | |
708 | if (dup2(ttyfd, 0) < 0) | |
709 | error("dup2 stdin: %s", strerror(errno)); | |
710 | if (dup2(ttyfd, 1) < 0) | |
711 | error("dup2 stdout: %s", strerror(errno)); | |
712 | if (dup2(ttyfd, 2) < 0) | |
713 | error("dup2 stderr: %s", strerror(errno)); | |
714 | ||
715 | /* Close the extra descriptor for the pseudo tty. */ | |
716 | close(ttyfd); | |
717 | ||
718 | /* record login, etc. similar to login(1) */ | |
719 | #ifndef HAVE_OSF_SIA | |
d03f4262 | 720 | if (!(options.use_login && command == NULL)) { |
721 | #ifdef _UNICOS | |
722 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
723 | #endif /* _UNICOS */ | |
3c0ef626 | 724 | do_login(s, command); |
d03f4262 | 725 | } |
3c0ef626 | 726 | # ifdef LOGIN_NEEDS_UTMPX |
727 | else | |
728 | do_pre_login(s); | |
729 | # endif | |
730 | #endif | |
5156b1a1 | 731 | /* |
732 | * Do common processing for the child, such as execing | |
733 | * the command. | |
734 | */ | |
735 | do_child(s, command); | |
736 | /* NOTREACHED */ | |
737 | default: | |
738 | break; | |
3c0ef626 | 739 | } |
5156b1a1 | 740 | |
d03f4262 | 741 | #ifdef _UNICOS |
742 | signal(WJSIGNAL, cray_job_termination_handler); | |
743 | #endif /* _UNICOS */ | |
3c0ef626 | 744 | #ifdef HAVE_CYGWIN |
745 | if (is_winnt) | |
746 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
747 | #endif | |
5156b1a1 | 748 | |
3c0ef626 | 749 | s->pid = pid; |
750 | ||
751 | /* Parent. Close the slave side of the pseudo tty. */ | |
752 | close(ttyfd); | |
753 | ||
3c0ef626 | 754 | /* Enter interactive session. */ |
5156b1a1 | 755 | s->ptymaster = ptymaster; |
3c0ef626 | 756 | packet_set_interactive(1); |
757 | if (compat20) { | |
5156b1a1 | 758 | session_set_fds(s, ptyfd, fdout, -1, 1); |
3c0ef626 | 759 | } else { |
760 | server_loop(pid, ptyfd, fdout, -1); | |
761 | /* server_loop _has_ closed ptyfd and fdout. */ | |
762 | } | |
5156b1a1 | 763 | return 0; |
3c0ef626 | 764 | } |
765 | ||
766 | #ifdef LOGIN_NEEDS_UTMPX | |
767 | static void | |
768 | do_pre_login(Session *s) | |
769 | { | |
770 | socklen_t fromlen; | |
771 | struct sockaddr_storage from; | |
772 | pid_t pid = getpid(); | |
773 | ||
774 | /* | |
775 | * Get IP address of client. If the connection is not a socket, let | |
776 | * the address be 0.0.0.0. | |
777 | */ | |
778 | memset(&from, 0, sizeof(from)); | |
d03f4262 | 779 | fromlen = sizeof(from); |
3c0ef626 | 780 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 781 | if (getpeername(packet_get_connection_in(), |
30460aeb | 782 | (struct sockaddr *)&from, &fromlen) < 0) { |
3c0ef626 | 783 | debug("getpeername: %.100s", strerror(errno)); |
540d72c3 | 784 | cleanup_exit(255); |
3c0ef626 | 785 | } |
786 | } | |
787 | ||
788 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
7cac2b65 | 789 | get_remote_name_or_ip(utmp_len, options.use_dns), |
bfe49944 | 790 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 791 | } |
792 | #endif | |
793 | ||
794 | /* | |
795 | * This is called to fork and execute a command. If another command is | |
796 | * to be forced, execute that instead. | |
797 | */ | |
5156b1a1 | 798 | int |
3c0ef626 | 799 | do_exec(Session *s, const char *command) |
800 | { | |
5156b1a1 | 801 | int ret; |
802 | ||
30460aeb | 803 | if (options.adm_forced_command) { |
804 | original_command = command; | |
805 | command = options.adm_forced_command; | |
e74dc197 | 806 | if (strcmp(INTERNAL_SFTP_NAME, command) == 0) |
807 | s->is_subsystem = SUBSYSTEM_INT_SFTP; | |
808 | else if (s->is_subsystem) | |
809 | s->is_subsystem = SUBSYSTEM_EXT; | |
30460aeb | 810 | debug("Forced command (config) '%.900s'", command); |
811 | } else if (forced_command) { | |
3c0ef626 | 812 | original_command = command; |
813 | command = forced_command; | |
e74dc197 | 814 | if (strcmp(INTERNAL_SFTP_NAME, command) == 0) |
815 | s->is_subsystem = SUBSYSTEM_INT_SFTP; | |
816 | else if (s->is_subsystem) | |
817 | s->is_subsystem = SUBSYSTEM_EXT; | |
30460aeb | 818 | debug("Forced command (key option) '%.900s'", command); |
3c0ef626 | 819 | } |
820 | ||
7cac2b65 | 821 | #if defined(SESSION_HOOKS) |
822 | if (options.session_hooks_allow && | |
823 | (options.session_hooks_startup_cmd || | |
824 | options.session_hooks_shutdown_cmd)) | |
825 | { | |
826 | char env_file[1000]; | |
827 | struct stat st; | |
828 | do | |
829 | { | |
830 | snprintf(env_file, | |
831 | sizeof(env_file), | |
832 | "/tmp/ssh_env_%d%d%d", | |
833 | getuid(), | |
834 | getpid(), | |
835 | rand()); | |
836 | } while (stat(env_file, &st)==0); | |
837 | s->authctxt->session_env_file = strdup(env_file); | |
838 | } | |
839 | #endif | |
840 | ||
dfddba3d | 841 | #ifdef SSH_AUDIT_EVENTS |
842 | if (command != NULL) | |
843 | PRIVSEP(audit_run_command(command)); | |
844 | else if (s->ttyfd == -1) { | |
845 | char *shell = s->pw->pw_shell; | |
846 | ||
847 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
848 | shell =_PATH_BSHELL; | |
849 | PRIVSEP(audit_run_command(shell)); | |
850 | } | |
851 | #endif | |
3c0ef626 | 852 | if (s->ttyfd != -1) |
5156b1a1 | 853 | ret = do_exec_pty(s, command); |
3c0ef626 | 854 | else |
5156b1a1 | 855 | ret = do_exec_no_pty(s, command); |
3c0ef626 | 856 | |
857 | original_command = NULL; | |
3c0ef626 | 858 | |
7e82606e | 859 | /* |
860 | * Clear loginmsg: it's the child's responsibility to display | |
861 | * it to the user, otherwise multiple sessions may accumulate | |
862 | * multiple copies of the login messages. | |
863 | */ | |
864 | buffer_clear(&loginmsg); | |
5156b1a1 | 865 | |
866 | return ret; | |
7e82606e | 867 | } |
e9702f7d | 868 | |
3c0ef626 | 869 | /* administrative, login(1)-like work */ |
870 | void | |
871 | do_login(Session *s, const char *command) | |
872 | { | |
3c0ef626 | 873 | socklen_t fromlen; |
874 | struct sockaddr_storage from; | |
3c0ef626 | 875 | struct passwd * pw = s->pw; |
876 | pid_t pid = getpid(); | |
877 | ||
878 | /* | |
879 | * Get IP address of client. If the connection is not a socket, let | |
880 | * the address be 0.0.0.0. | |
881 | */ | |
882 | memset(&from, 0, sizeof(from)); | |
bfe49944 | 883 | fromlen = sizeof(from); |
3c0ef626 | 884 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 885 | if (getpeername(packet_get_connection_in(), |
e9702f7d | 886 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 887 | debug("getpeername: %.100s", strerror(errno)); |
540d72c3 | 888 | cleanup_exit(255); |
3c0ef626 | 889 | } |
890 | } | |
891 | ||
3c0ef626 | 892 | /* Record that there was a login on that tty from the remote host. */ |
350391c5 | 893 | if (!use_privsep) |
894 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
895 | get_remote_name_or_ip(utmp_len, | |
7cac2b65 | 896 | options.use_dns), |
d03f4262 | 897 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 898 | |
899 | #ifdef USE_PAM | |
900 | /* | |
901 | * If password change is needed, do it now. | |
902 | * This needs to occur before the ~/.hushlogin check. | |
903 | */ | |
540d72c3 | 904 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
905 | display_loginmsg(); | |
3c0ef626 | 906 | do_pam_chauthtok(); |
540d72c3 | 907 | s->authctxt->force_pwchange = 0; |
7cac2b65 | 908 | /* XXX - signal [net] parent to enable forwardings */ |
3c0ef626 | 909 | } |
910 | #endif | |
911 | ||
912 | if (check_quietlogin(s, command)) | |
913 | return; | |
914 | ||
540d72c3 | 915 | display_loginmsg(); |
3c0ef626 | 916 | |
3c0ef626 | 917 | do_motd(); |
918 | } | |
919 | ||
920 | /* | |
921 | * Display the message of the day. | |
922 | */ | |
923 | void | |
924 | do_motd(void) | |
925 | { | |
926 | FILE *f; | |
927 | char buf[256]; | |
928 | ||
929 | if (options.print_motd) { | |
930 | #ifdef HAVE_LOGIN_CAP | |
931 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
932 | "/etc/motd"), "r"); | |
933 | #else | |
934 | f = fopen("/etc/motd", "r"); | |
935 | #endif | |
936 | if (f) { | |
937 | while (fgets(buf, sizeof(buf), f)) | |
938 | fputs(buf, stdout); | |
939 | fclose(f); | |
940 | } | |
941 | } | |
942 | } | |
943 | ||
944 | ||
945 | /* | |
946 | * Check for quiet login, either .hushlogin or command given. | |
947 | */ | |
948 | int | |
949 | check_quietlogin(Session *s, const char *command) | |
950 | { | |
951 | char buf[256]; | |
952 | struct passwd *pw = s->pw; | |
953 | struct stat st; | |
954 | ||
955 | /* Return 1 if .hushlogin exists or a command given. */ | |
956 | if (command != NULL) | |
957 | return 1; | |
958 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
959 | #ifdef HAVE_LOGIN_CAP | |
960 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
961 | return 1; | |
962 | #else | |
963 | if (stat(buf, &st) >= 0) | |
964 | return 1; | |
965 | #endif | |
966 | return 0; | |
967 | } | |
968 | ||
969 | /* | |
970 | * Sets the value of the given variable in the environment. If the variable | |
971 | * already exists, its value is overriden. | |
972 | */ | |
5598e598 | 973 | void |
3c0ef626 | 974 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
e9702f7d | 975 | const char *value) |
3c0ef626 | 976 | { |
3c0ef626 | 977 | char **env; |
29d88157 | 978 | u_int envsize; |
979 | u_int i, namelen; | |
3c0ef626 | 980 | |
7cac2b65 | 981 | /* |
982 | * If we're passed an uninitialized list, allocate a single null | |
983 | * entry before continuing. | |
984 | */ | |
985 | if (*envp == NULL && *envsizep == 0) { | |
986 | *envp = xmalloc(sizeof(char *)); | |
987 | *envp[0] = NULL; | |
988 | *envsizep = 1; | |
989 | } | |
990 | ||
3c0ef626 | 991 | /* |
992 | * Find the slot where the value should be stored. If the variable | |
993 | * already exists, we reuse the slot; otherwise we append a new slot | |
994 | * at the end of the array, expanding if necessary. | |
995 | */ | |
996 | env = *envp; | |
997 | namelen = strlen(name); | |
998 | for (i = 0; env[i]; i++) | |
999 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
1000 | break; | |
1001 | if (env[i]) { | |
1002 | /* Reuse the slot. */ | |
1003 | xfree(env[i]); | |
1004 | } else { | |
1005 | /* New variable. Expand if necessary. */ | |
29d88157 | 1006 | envsize = *envsizep; |
1007 | if (i >= envsize - 1) { | |
1008 | if (envsize >= 1000) | |
1009 | fatal("child_set_env: too many env vars"); | |
1010 | envsize += 50; | |
30460aeb | 1011 | env = (*envp) = xrealloc(env, envsize, sizeof(char *)); |
29d88157 | 1012 | *envsizep = envsize; |
3c0ef626 | 1013 | } |
1014 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
1015 | env[i + 1] = NULL; | |
1016 | } | |
1017 | ||
1018 | /* Allocate space and format the variable in the appropriate slot. */ | |
1019 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
1020 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | * Reads environment variables from the given file and adds/overrides them | |
1025 | * into the environment. If the file does not exist, this does nothing. | |
1026 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
1027 | * and assignments of the form name=value. No other forms are allowed. | |
1028 | */ | |
1029 | static void | |
1030 | read_environment_file(char ***env, u_int *envsize, | |
e9702f7d | 1031 | const char *filename) |
3c0ef626 | 1032 | { |
1033 | FILE *f; | |
1034 | char buf[4096]; | |
1035 | char *cp, *value; | |
276b07a3 | 1036 | u_int lineno = 0; |
3c0ef626 | 1037 | |
1038 | f = fopen(filename, "r"); | |
1039 | if (!f) | |
1040 | return; | |
1041 | ||
1042 | while (fgets(buf, sizeof(buf), f)) { | |
276b07a3 | 1043 | if (++lineno > 1000) |
1044 | fatal("Too many lines in environment file %s", filename); | |
3c0ef626 | 1045 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
1046 | ; | |
1047 | if (!*cp || *cp == '#' || *cp == '\n') | |
1048 | continue; | |
e74dc197 | 1049 | |
1050 | cp[strcspn(cp, "\n")] = '\0'; | |
1051 | ||
3c0ef626 | 1052 | value = strchr(cp, '='); |
1053 | if (value == NULL) { | |
276b07a3 | 1054 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
1055 | filename); | |
3c0ef626 | 1056 | continue; |
1057 | } | |
1058 | /* | |
1059 | * Replace the equals sign by nul, and advance value to | |
1060 | * the value string. | |
1061 | */ | |
1062 | *value = '\0'; | |
1063 | value++; | |
1064 | child_set_env(env, envsize, cp, value); | |
1065 | } | |
1066 | fclose(f); | |
1067 | } | |
1068 | ||
75be3237 | 1069 | #ifdef SESSION_HOOKS |
1070 | #define SSH_SESSION_ENV_FILE "SSH_SESSION_ENV_FILE" | |
1071 | ||
1072 | typedef enum { no_op, execute, clear_env, restore_env, | |
1073 | read_env, save_or_rm_env } session_action_t; | |
1074 | ||
1075 | static session_action_t action_order[2][5] = { | |
1076 | { clear_env, read_env, execute, save_or_rm_env, restore_env }, /*shutdown*/ | |
1077 | { execute, read_env, save_or_rm_env, no_op, no_op } /*startup */ | |
1078 | }; | |
1079 | ||
1080 | static | |
1081 | void execute_session_hook(char* prog, Authctxt *authctxt, | |
1082 | int startup, int save) | |
1083 | { | |
1084 | extern char **environ; | |
1085 | ||
1086 | struct stat st; | |
1087 | char **saved_env, **tmpenv; | |
1088 | char *env_file = authctxt->session_env_file; | |
1089 | int i, status = 0; | |
1090 | ||
1091 | for (i=0; i<5; i++) | |
1092 | { | |
1093 | switch (action_order[startup][i]) | |
1094 | { | |
1095 | case no_op: | |
1096 | break; | |
1097 | ||
1098 | case execute: | |
1099 | { | |
1100 | FILE* fp; | |
1101 | char buf[1000]; | |
1102 | ||
1103 | snprintf(buf, | |
1104 | sizeof(buf), | |
1105 | "%s -c '%s'", | |
1106 | authctxt->pw->pw_shell, | |
1107 | prog); | |
1108 | ||
1109 | debug("executing session hook: [%s]", buf); | |
1110 | setenv(SSH_SESSION_ENV_FILE, env_file, /* overwrite = */ 1); | |
1111 | ||
1112 | /* flusing is recommended in the popen(3) man page, to avoid | |
1113 | intermingling of output */ | |
1114 | fflush(stdout); | |
1115 | fflush(stderr); | |
1116 | if ((fp=popen(buf, "w")) == NULL) | |
1117 | { | |
1118 | perror("Unable to run session hook"); | |
1119 | return; | |
1120 | } | |
1121 | status = pclose(fp); | |
1122 | debug2("session hook executed, status=%d", status); | |
1123 | unsetenv(SSH_SESSION_ENV_FILE); | |
1124 | } | |
1125 | break; | |
1126 | ||
1127 | case clear_env: | |
1128 | saved_env = environ; | |
1129 | tmpenv = (char**) malloc(sizeof(char*)); | |
1130 | tmpenv[0] = NULL; | |
1131 | environ = tmpenv; | |
1132 | break; | |
1133 | ||
1134 | case restore_env: | |
1135 | environ = saved_env; | |
1136 | free(tmpenv); | |
1137 | break; | |
1138 | ||
1139 | case read_env: | |
1140 | if (status==0 && stat(env_file, &st)==0) | |
1141 | { | |
1142 | int envsize = 0; | |
1143 | ||
1144 | debug("reading environment from %s", env_file); | |
1145 | while (environ[envsize++]) ; | |
1146 | read_environment_file(&environ, &envsize, env_file); | |
1147 | } | |
1148 | break; | |
1149 | ||
1150 | case save_or_rm_env: | |
1151 | if (status==0 && save) | |
1152 | { | |
1153 | FILE* fp; | |
1154 | int envcount=0; | |
1155 | ||
1156 | debug2("saving environment to %s", env_file); | |
1157 | if ((fp = fopen(env_file, "w")) == NULL) /* hmm: file perms? */ | |
1158 | { | |
1159 | perror("Unable to save session hook info"); | |
1160 | } | |
1161 | while (environ[envcount]) | |
1162 | { | |
1163 | fprintf(fp, "%s\n", environ[envcount++]); | |
1164 | } | |
1165 | fflush(fp); | |
1166 | fclose(fp); | |
1167 | } | |
1168 | else if (stat(env_file, &st)==0) | |
1169 | { | |
1170 | debug2("removing environment file %s", env_file); | |
1171 | remove(env_file); | |
1172 | } | |
1173 | break; | |
1174 | } | |
1175 | } | |
1176 | ||
1177 | } | |
1178 | #endif | |
1179 | ||
7cac2b65 | 1180 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
1181 | /* | |
1182 | * Return named variable from specified environment, or NULL if not present. | |
1183 | */ | |
1184 | static char * | |
1185 | child_get_env(char **env, const char *name) | |
1186 | { | |
1187 | int i; | |
1188 | size_t len; | |
1189 | ||
1190 | len = strlen(name); | |
1191 | for (i=0; env[i] != NULL; i++) | |
1192 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
1193 | return(env[i] + len + 1); | |
1194 | return NULL; | |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * Read /etc/default/login. | |
1199 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
1200 | */ | |
1201 | static void | |
1202 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
1203 | { | |
1204 | char **tmpenv = NULL, *var; | |
29d88157 | 1205 | u_int i, tmpenvsize = 0; |
540d72c3 | 1206 | u_long mask; |
7cac2b65 | 1207 | |
1208 | /* | |
1209 | * We don't want to copy the whole file to the child's environment, | |
1210 | * so we use a temporary environment and copy the variables we're | |
1211 | * interested in. | |
1212 | */ | |
1213 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
1214 | ||
29d88157 | 1215 | if (tmpenv == NULL) |
1216 | return; | |
1217 | ||
7cac2b65 | 1218 | if (uid == 0) |
1219 | var = child_get_env(tmpenv, "SUPATH"); | |
1220 | else | |
1221 | var = child_get_env(tmpenv, "PATH"); | |
1222 | if (var != NULL) | |
1223 | child_set_env(env, envsize, "PATH", var); | |
540d72c3 | 1224 | |
7cac2b65 | 1225 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
1226 | if (sscanf(var, "%5lo", &mask) == 1) | |
540d72c3 | 1227 | umask((mode_t)mask); |
1228 | ||
7cac2b65 | 1229 | for (i = 0; tmpenv[i] != NULL; i++) |
1230 | xfree(tmpenv[i]); | |
1231 | xfree(tmpenv); | |
1232 | } | |
1233 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1234 | ||
2ce0bfe4 | 1235 | void |
1236 | copy_environment(char **source, char ***env, u_int *envsize) | |
3c0ef626 | 1237 | { |
e9702f7d | 1238 | char *var_name, *var_val; |
3c0ef626 | 1239 | int i; |
1240 | ||
e9702f7d | 1241 | if (source == NULL) |
3c0ef626 | 1242 | return; |
1243 | ||
e9702f7d | 1244 | for(i = 0; source[i] != NULL; i++) { |
1245 | var_name = xstrdup(source[i]); | |
1246 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
1247 | xfree(var_name); | |
3c0ef626 | 1248 | continue; |
3c0ef626 | 1249 | } |
e9702f7d | 1250 | *var_val++ = '\0'; |
3c0ef626 | 1251 | |
e9702f7d | 1252 | debug3("Copy environment: %s=%s", var_name, var_val); |
1253 | child_set_env(env, envsize, var_name, var_val); | |
540d72c3 | 1254 | |
e9702f7d | 1255 | xfree(var_name); |
3c0ef626 | 1256 | } |
3c0ef626 | 1257 | } |
1258 | ||
e9702f7d | 1259 | static char ** |
1260 | do_setup_env(Session *s, const char *shell) | |
3c0ef626 | 1261 | { |
3c0ef626 | 1262 | char buf[256]; |
e9702f7d | 1263 | u_int i, envsize; |
30460aeb | 1264 | char **env, *laddr; |
e9702f7d | 1265 | struct passwd *pw = s->pw; |
30460aeb | 1266 | #ifndef HAVE_LOGIN_CAP |
1267 | char *path = NULL; | |
1268 | #endif | |
3c0ef626 | 1269 | |
1270 | /* Initialize the environment. */ | |
1271 | envsize = 100; | |
30460aeb | 1272 | env = xcalloc(envsize, sizeof(char *)); |
3c0ef626 | 1273 | env[0] = NULL; |
1274 | ||
1275 | #ifdef HAVE_CYGWIN | |
1276 | /* | |
1277 | * The Windows environment contains some setting which are | |
1278 | * important for a running system. They must not be dropped. | |
1279 | */ | |
dfddba3d | 1280 | { |
1281 | char **p; | |
1282 | ||
1283 | p = fetch_windows_environment(); | |
1284 | copy_environment(p, &env, &envsize); | |
1285 | free_windows_environment(p); | |
1286 | } | |
3c0ef626 | 1287 | #endif |
1288 | ||
5598e598 | 1289 | #ifdef GSSAPI |
540d72c3 | 1290 | /* Allow any GSSAPI methods that we've used to alter |
5598e598 | 1291 | * the childs environment as they see fit |
1292 | */ | |
7cac2b65 | 1293 | ssh_gssapi_do_child(&env, &envsize); |
5598e598 | 1294 | #endif |
1295 | ||
3c0ef626 | 1296 | if (!options.use_login) { |
1297 | /* Set basic environment. */ | |
7e82606e | 1298 | for (i = 0; i < s->num_env; i++) |
1299 | child_set_env(&env, &envsize, s->env[i].name, | |
1300 | s->env[i].val); | |
1301 | ||
3c0ef626 | 1302 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1303 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
bfe49944 | 1304 | #ifdef _AIX |
1305 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1306 | #endif | |
3c0ef626 | 1307 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
1308 | #ifdef HAVE_LOGIN_CAP | |
d03f4262 | 1309 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1310 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1311 | else | |
1312 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
3c0ef626 | 1313 | #else /* HAVE_LOGIN_CAP */ |
1314 | # ifndef HAVE_CYGWIN | |
1315 | /* | |
1316 | * There's no standard path on Windows. The path contains | |
1317 | * important components pointing to the system directories, | |
1318 | * needed for loading shared libraries. So the path better | |
1319 | * remains intact here. | |
1320 | */ | |
7cac2b65 | 1321 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1322 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1323 | path = child_get_env(env, "PATH"); | |
1324 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1325 | if (path == NULL || *path == '\0') { | |
540d72c3 | 1326 | child_set_env(&env, &envsize, "PATH", |
7cac2b65 | 1327 | s->pw->pw_uid == 0 ? |
1328 | SUPERUSER_PATH : _PATH_STDPATH); | |
1329 | } | |
3c0ef626 | 1330 | # endif /* HAVE_CYGWIN */ |
1331 | #endif /* HAVE_LOGIN_CAP */ | |
1332 | ||
1333 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1334 | _PATH_MAILDIR, pw->pw_name); | |
1335 | child_set_env(&env, &envsize, "MAIL", buf); | |
1336 | ||
1337 | /* Normal systems set SHELL by default. */ | |
1338 | child_set_env(&env, &envsize, "SHELL", shell); | |
1339 | } | |
1340 | if (getenv("TZ")) | |
1341 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1342 | ||
1752c22a | 1343 | #ifdef GSI /* GSI shared libs typically installed in non-system locations. */ |
1344 | { | |
1345 | char *cp; | |
1346 | ||
1347 | if ((cp = getenv("LD_LIBRARY_PATH")) != NULL) | |
1348 | child_set_env(&env, &envsize, "LD_LIBRARY_PATH", cp); | |
1349 | if ((cp = getenv("LIBPATH")) != NULL) | |
1350 | child_set_env(&env, &envsize, "LIBPATH", cp); | |
1351 | if ((cp = getenv("SHLIB_PATH")) != NULL) | |
1352 | child_set_env(&env, &envsize, "SHLIB_PATH", cp); | |
1353 | if ((cp = getenv("LD_LIBRARYN32_PATH")) != NULL) | |
1354 | child_set_env(&env, &envsize, "LD_LIBRARYN32_PATH",cp); | |
1355 | if ((cp = getenv("LD_LIBRARY64_PATH")) != NULL) | |
1356 | child_set_env(&env, &envsize, "LD_LIBRARY64_PATH",cp); | |
1357 | } | |
1358 | #endif | |
1359 | ||
3c0ef626 | 1360 | /* Set custom environment options from RSA authentication. */ |
1361 | if (!options.use_login) { | |
1362 | while (custom_environment) { | |
1363 | struct envstring *ce = custom_environment; | |
d03f4262 | 1364 | char *str = ce->s; |
e9702f7d | 1365 | |
d03f4262 | 1366 | for (i = 0; str[i] != '=' && str[i]; i++) |
3c0ef626 | 1367 | ; |
d03f4262 | 1368 | if (str[i] == '=') { |
1369 | str[i] = 0; | |
1370 | child_set_env(&env, &envsize, str, str + i + 1); | |
3c0ef626 | 1371 | } |
1372 | custom_environment = ce->next; | |
1373 | xfree(ce->s); | |
1374 | xfree(ce); | |
1375 | } | |
1376 | } | |
1377 | ||
d03f4262 | 1378 | /* SSH_CLIENT deprecated */ |
3c0ef626 | 1379 | snprintf(buf, sizeof buf, "%.50s %d %d", |
e9702f7d | 1380 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
3c0ef626 | 1381 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1382 | ||
bfe49944 | 1383 | laddr = get_local_ipaddr(packet_get_connection_in()); |
d03f4262 | 1384 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
bfe49944 | 1385 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1386 | xfree(laddr); | |
d03f4262 | 1387 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1388 | ||
3c0ef626 | 1389 | if (s->ttyfd != -1) |
1390 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1391 | if (s->term) | |
1392 | child_set_env(&env, &envsize, "TERM", s->term); | |
1393 | if (s->display) | |
1394 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
1395 | if (original_command) | |
1396 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1397 | original_command); | |
1398 | ||
d03f4262 | 1399 | #ifdef _UNICOS |
1400 | if (cray_tmpdir[0] != '\0') | |
1401 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1402 | #endif /* _UNICOS */ | |
1403 | ||
dfddba3d | 1404 | /* |
1405 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1406 | * must have been set by a native authentication method (eg AIX or | |
1407 | * SIA), so copy it to the child. | |
1408 | */ | |
1409 | { | |
1410 | char *cp; | |
1411 | ||
1412 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1413 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1414 | } | |
1415 | ||
3c0ef626 | 1416 | #ifdef _AIX |
e9702f7d | 1417 | { |
1418 | char *cp; | |
1419 | ||
1420 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1421 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
e9702f7d | 1422 | read_environment_file(&env, &envsize, "/etc/environment"); |
1423 | } | |
3c0ef626 | 1424 | #endif |
3c0ef626 | 1425 | #ifdef KRB5 |
12a403af | 1426 | if (s->authctxt->krb5_ccname) |
3c0ef626 | 1427 | child_set_env(&env, &envsize, "KRB5CCNAME", |
12a403af | 1428 | s->authctxt->krb5_ccname); |
3c0ef626 | 1429 | #endif |
1430 | #ifdef USE_PAM | |
d03f4262 | 1431 | /* |
1432 | * Pull in any environment variables that may have | |
1433 | * been set by PAM. | |
1434 | */ | |
7cac2b65 | 1435 | if (options.use_pam) { |
540d72c3 | 1436 | char **p; |
d03f4262 | 1437 | |
540d72c3 | 1438 | p = fetch_pam_child_environment(); |
1439 | copy_environment(p, &env, &envsize); | |
1440 | free_pam_environment(p); | |
1441 | ||
1442 | p = fetch_pam_environment(); | |
d03f4262 | 1443 | copy_environment(p, &env, &envsize); |
1444 | free_pam_environment(p); | |
1445 | } | |
3c0ef626 | 1446 | #endif /* USE_PAM */ |
1447 | ||
44a053a3 | 1448 | if (auth_sock_name != NULL) |
3c0ef626 | 1449 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
44a053a3 | 1450 | auth_sock_name); |
3c0ef626 | 1451 | |
1452 | /* read $HOME/.ssh/environment. */ | |
d03f4262 | 1453 | if (options.permit_user_env && !options.use_login) { |
3c0ef626 | 1454 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
d03f4262 | 1455 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
3c0ef626 | 1456 | read_environment_file(&env, &envsize, buf); |
1457 | } | |
1458 | if (debug_flag) { | |
1459 | /* dump the environment */ | |
1460 | fprintf(stderr, "Environment:\n"); | |
1461 | for (i = 0; env[i]; i++) | |
1462 | fprintf(stderr, " %.200s\n", env[i]); | |
1463 | } | |
e9702f7d | 1464 | return env; |
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1469 | * first in this order). | |
1470 | */ | |
1471 | static void | |
1472 | do_rc_files(Session *s, const char *shell) | |
1473 | { | |
1474 | FILE *f = NULL; | |
1475 | char cmd[1024]; | |
1476 | int do_xauth; | |
1477 | struct stat st; | |
1478 | ||
1479 | do_xauth = | |
1480 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1481 | ||
e74dc197 | 1482 | /* ignore _PATH_SSH_USER_RC for subsystems and admin forced commands */ |
1483 | if (!s->is_subsystem && options.adm_forced_command == NULL && | |
5156b1a1 | 1484 | !no_user_rc && stat(_PATH_SSH_USER_RC, &st) >= 0) { |
e9702f7d | 1485 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", |
1486 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1487 | if (debug_flag) | |
1488 | fprintf(stderr, "Running %s\n", cmd); | |
1489 | f = popen(cmd, "w"); | |
1490 | if (f) { | |
1491 | if (do_xauth) | |
1492 | fprintf(f, "%s %s\n", s->auth_proto, | |
1493 | s->auth_data); | |
1494 | pclose(f); | |
1495 | } else | |
1496 | fprintf(stderr, "Could not run %s\n", | |
1497 | _PATH_SSH_USER_RC); | |
1498 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1499 | if (debug_flag) | |
1500 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1501 | _PATH_SSH_SYSTEM_RC); | |
1502 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1503 | if (f) { | |
1504 | if (do_xauth) | |
1505 | fprintf(f, "%s %s\n", s->auth_proto, | |
1506 | s->auth_data); | |
1507 | pclose(f); | |
1508 | } else | |
1509 | fprintf(stderr, "Could not run %s\n", | |
1510 | _PATH_SSH_SYSTEM_RC); | |
1511 | } else if (do_xauth && options.xauth_location != NULL) { | |
1512 | /* Add authority data to .Xauthority if appropriate. */ | |
1513 | if (debug_flag) { | |
1514 | fprintf(stderr, | |
bfe49944 | 1515 | "Running %.500s remove %.100s\n", |
540d72c3 | 1516 | options.xauth_location, s->auth_display); |
bfe49944 | 1517 | fprintf(stderr, |
1518 | "%.500s add %.100s %.100s %.100s\n", | |
e9702f7d | 1519 | options.xauth_location, s->auth_display, |
1520 | s->auth_proto, s->auth_data); | |
1521 | } | |
1522 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1523 | options.xauth_location); | |
1524 | f = popen(cmd, "w"); | |
1525 | if (f) { | |
bfe49944 | 1526 | fprintf(f, "remove %s\n", |
1527 | s->auth_display); | |
e9702f7d | 1528 | fprintf(f, "add %s %s %s\n", |
1529 | s->auth_display, s->auth_proto, | |
1530 | s->auth_data); | |
1531 | pclose(f); | |
1532 | } else { | |
1533 | fprintf(stderr, "Could not run %s\n", | |
1534 | cmd); | |
1535 | } | |
1536 | } | |
1537 | } | |
1538 | ||
1539 | static void | |
1540 | do_nologin(struct passwd *pw) | |
1541 | { | |
1542 | FILE *f = NULL; | |
1543 | char buf[1024]; | |
1544 | ||
1545 | #ifdef HAVE_LOGIN_CAP | |
1546 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1547 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1548 | _PATH_NOLOGIN), "r"); | |
1549 | #else | |
1550 | if (pw->pw_uid) | |
1551 | f = fopen(_PATH_NOLOGIN, "r"); | |
1552 | #endif | |
1553 | if (f) { | |
1554 | /* /etc/nologin exists. Print its contents and exit. */ | |
7cac2b65 | 1555 | logit("User %.100s not allowed because %s exists", |
d03f4262 | 1556 | pw->pw_name, _PATH_NOLOGIN); |
e9702f7d | 1557 | while (fgets(buf, sizeof(buf), f)) |
1558 | fputs(buf, stderr); | |
1559 | fclose(f); | |
bfe49944 | 1560 | fflush(NULL); |
e9702f7d | 1561 | exit(254); |
1562 | } | |
1563 | } | |
1564 | ||
e74dc197 | 1565 | /* |
1566 | * Chroot into a directory after checking it for safety: all path components | |
1567 | * must be root-owned directories with strict permissions. | |
1568 | */ | |
1569 | static void | |
1570 | safely_chroot(const char *path, uid_t uid) | |
1571 | { | |
1572 | const char *cp; | |
1573 | char component[MAXPATHLEN]; | |
1574 | struct stat st; | |
1575 | ||
1576 | if (*path != '/') | |
1577 | fatal("chroot path does not begin at root"); | |
1578 | if (strlen(path) >= sizeof(component)) | |
1579 | fatal("chroot path too long"); | |
1580 | ||
1581 | /* | |
1582 | * Descend the path, checking that each component is a | |
1583 | * root-owned directory with strict permissions. | |
1584 | */ | |
1585 | for (cp = path; cp != NULL;) { | |
1586 | if ((cp = strchr(cp, '/')) == NULL) | |
1587 | strlcpy(component, path, sizeof(component)); | |
1588 | else { | |
1589 | cp++; | |
1590 | memcpy(component, path, cp - path); | |
1591 | component[cp - path] = '\0'; | |
1592 | } | |
1593 | ||
1594 | debug3("%s: checking '%s'", __func__, component); | |
1595 | ||
1596 | if (stat(component, &st) != 0) | |
1597 | fatal("%s: stat(\"%s\"): %s", __func__, | |
1598 | component, strerror(errno)); | |
1599 | if (st.st_uid != 0 || (st.st_mode & 022) != 0) | |
1600 | fatal("bad ownership or modes for chroot " | |
1601 | "directory %s\"%s\"", | |
1602 | cp == NULL ? "" : "component ", component); | |
1603 | if (!S_ISDIR(st.st_mode)) | |
1604 | fatal("chroot path %s\"%s\" is not a directory", | |
1605 | cp == NULL ? "" : "component ", component); | |
1606 | ||
1607 | } | |
1608 | ||
1609 | if (chdir(path) == -1) | |
1610 | fatal("Unable to chdir to chroot path \"%s\": " | |
1611 | "%s", path, strerror(errno)); | |
1612 | if (chroot(path) == -1) | |
1613 | fatal("chroot(\"%s\"): %s", path, strerror(errno)); | |
1614 | if (chdir("/") == -1) | |
1615 | fatal("%s: chdir(/) after chroot: %s", | |
1616 | __func__, strerror(errno)); | |
1617 | verbose("Changed root directory to \"%s\"", path); | |
1618 | } | |
1619 | ||
e9702f7d | 1620 | /* Set login name, uid, gid, and groups. */ |
350391c5 | 1621 | void |
e9702f7d | 1622 | do_setusercontext(struct passwd *pw) |
1623 | { | |
e74dc197 | 1624 | char *chroot_path, *tmp; |
1625 | ||
1626 | #ifdef WITH_SELINUX | |
1627 | /* Cache selinux status for later use */ | |
1628 | (void)ssh_selinux_enabled(); | |
1629 | #endif | |
1630 | ||
bfe49944 | 1631 | #ifndef HAVE_CYGWIN |
1632 | if (getuid() == 0 || geteuid() == 0) | |
e9702f7d | 1633 | #endif /* HAVE_CYGWIN */ |
bfe49944 | 1634 | { |
1635 | ||
44a053a3 | 1636 | #ifdef HAVE_SETPCRED |
7cac2b65 | 1637 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1638 | fatal("Failed to set process credentials"); | |
44a053a3 | 1639 | #endif /* HAVE_SETPCRED */ |
e9702f7d | 1640 | #ifdef HAVE_LOGIN_CAP |
d03f4262 | 1641 | # ifdef __bsdi__ |
276b07a3 | 1642 | setpgid(0, 0); |
d03f4262 | 1643 | # endif |
540d72c3 | 1644 | # ifdef USE_PAM |
1645 | if (options.use_pam) { | |
fa0f0f45 | 1646 | do_pam_setcred(use_privsep); |
540d72c3 | 1647 | } |
1648 | # endif /* USE_PAM */ | |
e9702f7d | 1649 | if (setusercontext(lc, pw, pw->pw_uid, |
e74dc197 | 1650 | (LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETUSER))) < 0) { |
e9702f7d | 1651 | perror("unable to set user context"); |
1652 | exit(1); | |
1653 | } | |
1654 | #else | |
1655 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1656 | /* Sets login uid for accounting */ | |
1657 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1658 | error("setluid: %s", strerror(errno)); | |
1659 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1660 | ||
1661 | if (setlogin(pw->pw_name) < 0) | |
1662 | error("setlogin failed: %s", strerror(errno)); | |
1663 | if (setgid(pw->pw_gid) < 0) { | |
1664 | perror("setgid"); | |
1665 | exit(1); | |
1666 | } | |
1667 | /* Initialize the group list. */ | |
1668 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1669 | perror("initgroups"); | |
1670 | exit(1); | |
1671 | } | |
1672 | endgrent(); | |
1673 | # ifdef USE_PAM | |
1674 | /* | |
540d72c3 | 1675 | * PAM credentials may take the form of supplementary groups. |
e9702f7d | 1676 | * These will have been wiped by the above initgroups() call. |
1677 | * Reestablish them here. | |
1678 | */ | |
7cac2b65 | 1679 | if (options.use_pam) { |
fa0f0f45 | 1680 | do_pam_setcred(use_privsep); |
7cac2b65 | 1681 | } |
e9702f7d | 1682 | # endif /* USE_PAM */ |
1683 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1684 | irix_setusercontext(pw); | |
e74dc197 | 1685 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ |
276b07a3 | 1686 | # ifdef _AIX |
d03f4262 | 1687 | aix_usrinfo(pw); |
276b07a3 | 1688 | # endif /* _AIX */ |
e74dc197 | 1689 | # ifdef USE_LIBIAF |
2ce0bfe4 | 1690 | if (set_id(pw->pw_name) != 0) { |
1691 | exit(1); | |
1692 | } | |
e74dc197 | 1693 | # endif /* USE_LIBIAF */ |
1694 | #endif | |
1695 | ||
1696 | if (options.chroot_directory != NULL && | |
1697 | strcasecmp(options.chroot_directory, "none") != 0) { | |
1698 | tmp = tilde_expand_filename(options.chroot_directory, | |
1699 | pw->pw_uid); | |
1700 | chroot_path = percent_expand(tmp, "h", pw->pw_dir, | |
1701 | "u", pw->pw_name, (char *)NULL); | |
1702 | safely_chroot(chroot_path, pw->pw_uid); | |
1703 | free(tmp); | |
1704 | free(chroot_path); | |
1705 | } | |
1706 | ||
1707 | #ifdef HAVE_LOGIN_CAP | |
1708 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETUSER) < 0) { | |
1709 | perror("unable to set user context (setuser)"); | |
1710 | exit(1); | |
1711 | } | |
1712 | #else | |
e9702f7d | 1713 | /* Permanently switch to the desired uid. */ |
1714 | permanently_set_uid(pw); | |
1715 | #endif | |
1716 | } | |
bfe49944 | 1717 | |
1718 | #ifdef HAVE_CYGWIN | |
1719 | if (is_winnt) | |
1720 | #endif | |
e9702f7d | 1721 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1722 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
30460aeb | 1723 | |
1724 | #ifdef WITH_SELINUX | |
1725 | ssh_selinux_setup_exec_context(pw->pw_name); | |
1726 | #endif | |
e9702f7d | 1727 | } |
1728 | ||
540d72c3 | 1729 | static void |
1730 | do_pwchange(Session *s) | |
1731 | { | |
7e82606e | 1732 | fflush(NULL); |
540d72c3 | 1733 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1734 | if (s->ttyfd != -1) { | |
7e82606e | 1735 | fprintf(stderr, |
540d72c3 | 1736 | "You must change your password now and login again!\n"); |
dfddba3d | 1737 | #ifdef PASSWD_NEEDS_USERNAME |
1738 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1739 | (char *)NULL); | |
1740 | #else | |
540d72c3 | 1741 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
dfddba3d | 1742 | #endif |
540d72c3 | 1743 | perror("passwd"); |
1744 | } else { | |
1745 | fprintf(stderr, | |
1746 | "Password change required but no TTY available.\n"); | |
1747 | } | |
1748 | exit(1); | |
1749 | } | |
1750 | ||
350391c5 | 1751 | static void |
1752 | launch_login(struct passwd *pw, const char *hostname) | |
1753 | { | |
1754 | /* Launch login(1). */ | |
1755 | ||
44a053a3 | 1756 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
350391c5 | 1757 | #ifdef xxxLOGIN_NEEDS_TERM |
44a053a3 | 1758 | (s->term ? s->term : "unknown"), |
350391c5 | 1759 | #endif /* LOGIN_NEEDS_TERM */ |
1760 | #ifdef LOGIN_NO_ENDOPT | |
1761 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1762 | #else | |
1763 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1764 | #endif | |
1765 | ||
1766 | /* Login couldn't be executed, die. */ | |
1767 | ||
1768 | perror("login"); | |
1769 | exit(1); | |
1770 | } | |
1771 | ||
540d72c3 | 1772 | static void |
1773 | child_close_fds(void) | |
1774 | { | |
1775 | int i; | |
1776 | ||
1777 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1778 | close(packet_get_connection_in()); | |
1779 | else { | |
1780 | close(packet_get_connection_in()); | |
1781 | close(packet_get_connection_out()); | |
1782 | } | |
1783 | /* | |
1784 | * Close all descriptors related to channels. They will still remain | |
1785 | * open in the parent. | |
1786 | */ | |
1787 | /* XXX better use close-on-exec? -markus */ | |
1788 | channel_close_all(); | |
1789 | ||
1790 | /* | |
1791 | * Close any extra file descriptors. Note that there may still be | |
1792 | * descriptors left by system functions. They will be closed later. | |
1793 | */ | |
1794 | endpwent(); | |
1795 | ||
1796 | /* | |
08822d99 | 1797 | * Close any extra open file descriptors so that we don't have them |
540d72c3 | 1798 | * hanging around in clients. Note that we want to do this after |
1799 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1800 | * descriptors open. | |
1801 | */ | |
1802 | for (i = 3; i < 64; i++) | |
1803 | close(i); | |
1804 | } | |
1805 | ||
e9702f7d | 1806 | /* |
1807 | * Performs common processing for the child, such as setting up the | |
1808 | * environment, closing extra file descriptors, setting the user and group | |
1809 | * ids, and executing the command or shell. | |
1810 | */ | |
e74dc197 | 1811 | #define ARGV_MAX 10 |
e9702f7d | 1812 | void |
1813 | do_child(Session *s, const char *command) | |
1814 | { | |
1815 | extern char **environ; | |
1816 | char **env; | |
e74dc197 | 1817 | char *argv[ARGV_MAX]; |
e9702f7d | 1818 | const char *shell, *shell0, *hostname = NULL; |
1819 | struct passwd *pw = s->pw; | |
5156b1a1 | 1820 | int r = 0; |
e9702f7d | 1821 | |
62eb343a | 1822 | #ifdef AFS_KRB5 |
1823 | /* Default place to look for aklog. */ | |
1824 | #ifdef AKLOG_PATH | |
1825 | #define KPROGDIR AKLOG_PATH | |
1826 | #else | |
1827 | #define KPROGDIR "/usr/bin/aklog" | |
1828 | #endif /* AKLOG_PATH */ | |
1829 | ||
1830 | struct stat st; | |
1831 | char *aklog_path; | |
1832 | #endif /* AFS_KRB5 */ | |
1833 | ||
e9702f7d | 1834 | /* remove hostkey from the child's memory */ |
1835 | destroy_sensitive_data(); | |
1836 | ||
540d72c3 | 1837 | /* Force a password change */ |
1838 | if (s->authctxt->force_pwchange) { | |
1839 | do_setusercontext(pw); | |
1840 | child_close_fds(); | |
1841 | do_pwchange(s); | |
1842 | exit(1); | |
1843 | } | |
1844 | ||
e9702f7d | 1845 | /* login(1) is only called if we execute the login shell */ |
1846 | if (options.use_login && command != NULL) | |
1847 | options.use_login = 0; | |
1848 | ||
d03f4262 | 1849 | #ifdef _UNICOS |
1850 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1851 | #endif /* _UNICOS */ | |
1852 | ||
e9702f7d | 1853 | /* |
1854 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1855 | * switch, so we let login(1) to this for us. | |
1856 | */ | |
1857 | if (!options.use_login) { | |
1858 | #ifdef HAVE_OSF_SIA | |
bfe49944 | 1859 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
e9702f7d | 1860 | if (!check_quietlogin(s, command)) |
1861 | do_motd(); | |
1862 | #else /* HAVE_OSF_SIA */ | |
08822d99 | 1863 | /* When PAM is enabled we rely on it to do the nologin check */ |
1864 | if (!options.use_pam) | |
1865 | do_nologin(pw); | |
e9702f7d | 1866 | do_setusercontext(pw); |
7e82606e | 1867 | /* |
1868 | * PAM session modules in do_setusercontext may have | |
1869 | * generated messages, so if this in an interactive | |
1870 | * login then display them too. | |
1871 | */ | |
dfddba3d | 1872 | if (!check_quietlogin(s, command)) |
7e82606e | 1873 | display_loginmsg(); |
e9702f7d | 1874 | #endif /* HAVE_OSF_SIA */ |
1875 | } | |
1876 | ||
dfddba3d | 1877 | #ifdef USE_PAM |
8b32eddc | 1878 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1879 | debug3("PAM session not opened, exiting"); | |
dfddba3d | 1880 | display_loginmsg(); |
1881 | exit(254); | |
1882 | } | |
1883 | #endif | |
1884 | ||
e9702f7d | 1885 | /* |
1886 | * Get the shell from the password data. An empty shell field is | |
1887 | * legal, and means /bin/sh. | |
1888 | */ | |
1889 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
bfe49944 | 1890 | |
1891 | /* | |
1892 | * Make sure $SHELL points to the shell from the password file, | |
1893 | * even if shell is overridden from login.conf | |
1894 | */ | |
1895 | env = do_setup_env(s, shell); | |
1896 | ||
e9702f7d | 1897 | #ifdef HAVE_LOGIN_CAP |
1898 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1899 | #endif | |
1900 | ||
3c0ef626 | 1901 | /* we have to stash the hostname before we close our socket. */ |
1902 | if (options.use_login) | |
1903 | hostname = get_remote_name_or_ip(utmp_len, | |
7cac2b65 | 1904 | options.use_dns); |
3c0ef626 | 1905 | /* |
1906 | * Close the connection descriptors; note that this is the child, and | |
1907 | * the server will still have the socket open, and it is important | |
1908 | * that we do not shutdown it. Note that the descriptors cannot be | |
1909 | * closed before building the environment, as we call | |
1910 | * get_remote_ipaddr there. | |
1911 | */ | |
540d72c3 | 1912 | child_close_fds(); |
3c0ef626 | 1913 | |
1914 | /* | |
540d72c3 | 1915 | * Must take new environment into use so that .ssh/rc, |
1916 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
3c0ef626 | 1917 | */ |
540d72c3 | 1918 | environ = env; |
3c0ef626 | 1919 | |
540d72c3 | 1920 | #if defined(KRB5) && defined(USE_AFS) |
3c0ef626 | 1921 | /* |
540d72c3 | 1922 | * At this point, we check to see if AFS is active and if we have |
1923 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1924 | * if we can (and need to) extend the ticket into an AFS token. If | |
1925 | * we don't do this, we run into potential problems if the user's | |
1926 | * home directory is in AFS and it's not world-readable. | |
3c0ef626 | 1927 | */ |
3c0ef626 | 1928 | |
540d72c3 | 1929 | if (options.kerberos_get_afs_token && k_hasafs() && |
2ce0bfe4 | 1930 | (s->authctxt->krb5_ctx != NULL)) { |
540d72c3 | 1931 | char cell[64]; |
1932 | ||
1933 | debug("Getting AFS token"); | |
1934 | ||
1935 | k_setpag(); | |
1936 | ||
1937 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1938 | krb5_afslog(s->authctxt->krb5_ctx, | |
1939 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1940 | ||
1941 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1942 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1943 | } | |
1944 | #endif | |
3c0ef626 | 1945 | |
62eb343a | 1946 | #ifdef AFS_KRB5 |
1947 | ||
1948 | /* User has authenticated, and if a ticket was going to be | |
1949 | * passed we would have it. KRB5CCNAME should already be set. | |
1950 | * Now try to get an AFS token using aklog. | |
1951 | */ | |
1952 | if (k_hasafs()) { /* Do we have AFS? */ | |
1953 | ||
1954 | aklog_path = xstrdup(KPROGDIR); | |
1955 | ||
1956 | /* | |
1957 | * Make sure it exists before we try to run it | |
1958 | */ | |
1959 | if (stat(aklog_path, &st) == 0) { | |
1960 | debug("Running %s to get afs token.",aklog_path); | |
1961 | system(aklog_path); | |
1962 | } else { | |
1963 | debug("%s does not exist.",aklog_path); | |
1964 | } | |
1965 | ||
1966 | xfree(aklog_path); | |
1967 | } | |
1968 | #endif /* AFS_KRB5 */ | |
1969 | ||
75be3237 | 1970 | #ifdef SESSION_HOOKS |
1971 | if (options.session_hooks_allow && | |
1972 | options.session_hooks_startup_cmd) | |
1973 | { | |
1974 | execute_session_hook(options.session_hooks_startup_cmd, | |
1975 | s->authctxt, | |
1976 | /* startup = */ 1, | |
1977 | options.session_hooks_shutdown_cmd != NULL); | |
1978 | } | |
1979 | #endif | |
3c0ef626 | 1980 | |
08822d99 | 1981 | /* Change current directory to the user's home directory. */ |
3c0ef626 | 1982 | if (chdir(pw->pw_dir) < 0) { |
5156b1a1 | 1983 | /* Suppress missing homedir warning for chroot case */ |
3c0ef626 | 1984 | #ifdef HAVE_LOGIN_CAP |
5156b1a1 | 1985 | r = login_getcapbool(lc, "requirehome", 0); |
3c0ef626 | 1986 | #endif |
5156b1a1 | 1987 | if (r || options.chroot_directory == NULL) |
1988 | fprintf(stderr, "Could not chdir to home " | |
1989 | "directory %s: %s\n", pw->pw_dir, | |
1990 | strerror(errno)); | |
1991 | if (r) | |
1992 | exit(1); | |
3c0ef626 | 1993 | } |
1994 | ||
e74dc197 | 1995 | closefrom(STDERR_FILENO + 1); |
1996 | ||
e9702f7d | 1997 | if (!options.use_login) |
1998 | do_rc_files(s, shell); | |
3c0ef626 | 1999 | |
2000 | /* restore SIGPIPE for child */ | |
30460aeb | 2001 | signal(SIGPIPE, SIG_DFL); |
3c0ef626 | 2002 | |
e74dc197 | 2003 | if (s->is_subsystem == SUBSYSTEM_INT_SFTP) { |
2004 | extern int optind, optreset; | |
2005 | int i; | |
2006 | char *p, *args; | |
2007 | ||
2008 | setproctitle("%s@internal-sftp-server", s->pw->pw_name); | |
2009 | args = strdup(command ? command : "sftp-server"); | |
2010 | for (i = 0, (p = strtok(args, " ")); p; (p = strtok(NULL, " "))) | |
2011 | if (i < ARGV_MAX - 1) | |
2012 | argv[i++] = p; | |
2013 | argv[i] = NULL; | |
2014 | optind = optreset = 1; | |
2015 | __progname = argv[0]; | |
2016 | exit(sftp_server_main(i, argv, s->pw)); | |
2017 | } | |
2018 | ||
e9702f7d | 2019 | if (options.use_login) { |
350391c5 | 2020 | launch_login(pw, hostname); |
2021 | /* NEVERREACHED */ | |
e9702f7d | 2022 | } |
2023 | ||
2024 | /* Get the last component of the shell name. */ | |
2025 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
2026 | shell0++; | |
2027 | else | |
2028 | shell0 = shell; | |
2029 | ||
3c0ef626 | 2030 | /* |
2031 | * If we have no command, execute the shell. In this case, the shell | |
2032 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
2033 | * this is a login shell. | |
2034 | */ | |
2035 | if (!command) { | |
e9702f7d | 2036 | char argv0[256]; |
3c0ef626 | 2037 | |
e9702f7d | 2038 | /* Start the shell. Set initial character to '-'. */ |
2039 | argv0[0] = '-'; | |
3c0ef626 | 2040 | |
e9702f7d | 2041 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
2042 | >= sizeof(argv0) - 1) { | |
2043 | errno = EINVAL; | |
3c0ef626 | 2044 | perror(shell); |
2045 | exit(1); | |
e9702f7d | 2046 | } |
3c0ef626 | 2047 | |
e9702f7d | 2048 | /* Execute the shell. */ |
2049 | argv[0] = argv0; | |
2050 | argv[1] = NULL; | |
5ab1e3bd | 2051 | execve(shell, argv, environ); |
3c0ef626 | 2052 | |
e9702f7d | 2053 | /* Executing the shell failed. */ |
2054 | perror(shell); | |
2055 | exit(1); | |
3c0ef626 | 2056 | } |
2057 | /* | |
2058 | * Execute the command using the user's shell. This uses the -c | |
2059 | * option to execute the command. | |
2060 | */ | |
e9702f7d | 2061 | argv[0] = (char *) shell0; |
3c0ef626 | 2062 | argv[1] = "-c"; |
2063 | argv[2] = (char *) command; | |
2064 | argv[3] = NULL; | |
5ab1e3bd | 2065 | execve(shell, argv, environ); |
3c0ef626 | 2066 | perror(shell); |
2067 | exit(1); | |
2068 | } | |
2069 | ||
5156b1a1 | 2070 | void |
2071 | session_unused(int id) | |
2072 | { | |
2073 | debug3("%s: session id %d unused", __func__, id); | |
2074 | if (id >= options.max_sessions || | |
2075 | id >= sessions_nalloc) { | |
2076 | fatal("%s: insane session id %d (max %d nalloc %d)", | |
2077 | __func__, id, options.max_sessions, sessions_nalloc); | |
2078 | } | |
2079 | bzero(&sessions[id], sizeof(*sessions)); | |
2080 | sessions[id].self = id; | |
2081 | sessions[id].used = 0; | |
2082 | sessions[id].chanid = -1; | |
2083 | sessions[id].ptyfd = -1; | |
2084 | sessions[id].ttyfd = -1; | |
2085 | sessions[id].ptymaster = -1; | |
2086 | sessions[id].x11_chanids = NULL; | |
2087 | sessions[id].next_unused = sessions_first_unused; | |
2088 | sessions_first_unused = id; | |
2089 | } | |
2090 | ||
3c0ef626 | 2091 | Session * |
2092 | session_new(void) | |
2093 | { | |
5156b1a1 | 2094 | Session *s, *tmp; |
2095 | ||
2096 | if (sessions_first_unused == -1) { | |
2097 | if (sessions_nalloc >= options.max_sessions) | |
2098 | return NULL; | |
2099 | debug2("%s: allocate (allocated %d max %d)", | |
2100 | __func__, sessions_nalloc, options.max_sessions); | |
2101 | tmp = xrealloc(sessions, sessions_nalloc + 1, | |
2102 | sizeof(*sessions)); | |
2103 | if (tmp == NULL) { | |
2104 | error("%s: cannot allocate %d sessions", | |
2105 | __func__, sessions_nalloc + 1); | |
2106 | return NULL; | |
3c0ef626 | 2107 | } |
5156b1a1 | 2108 | sessions = tmp; |
2109 | session_unused(sessions_nalloc++); | |
3c0ef626 | 2110 | } |
5156b1a1 | 2111 | |
2112 | if (sessions_first_unused >= sessions_nalloc || | |
2113 | sessions_first_unused < 0) { | |
2114 | fatal("%s: insane first_unused %d max %d nalloc %d", | |
2115 | __func__, sessions_first_unused, options.max_sessions, | |
2116 | sessions_nalloc); | |
3c0ef626 | 2117 | } |
5156b1a1 | 2118 | |
2119 | s = &sessions[sessions_first_unused]; | |
2120 | if (s->used) { | |
2121 | fatal("%s: session %d already used", | |
2122 | __func__, sessions_first_unused); | |
2123 | } | |
2124 | sessions_first_unused = s->next_unused; | |
2125 | s->used = 1; | |
2126 | s->next_unused = -1; | |
2127 | debug("session_new: session %d", s->self); | |
2128 | ||
2129 | return s; | |
3c0ef626 | 2130 | } |
2131 | ||
2132 | static void | |
2133 | session_dump(void) | |
2134 | { | |
2135 | int i; | |
5156b1a1 | 2136 | for (i = 0; i < sessions_nalloc; i++) { |
3c0ef626 | 2137 | Session *s = &sessions[i]; |
5156b1a1 | 2138 | |
2139 | debug("dump: used %d next_unused %d session %d %p " | |
2140 | "channel %d pid %ld", | |
3c0ef626 | 2141 | s->used, |
5156b1a1 | 2142 | s->next_unused, |
3c0ef626 | 2143 | s->self, |
2144 | s, | |
2145 | s->chanid, | |
44a053a3 | 2146 | (long)s->pid); |
3c0ef626 | 2147 | } |
2148 | } | |
2149 | ||
2150 | int | |
2151 | session_open(Authctxt *authctxt, int chanid) | |
2152 | { | |
2153 | Session *s = session_new(); | |
2154 | debug("session_open: channel %d", chanid); | |
2155 | if (s == NULL) { | |
2156 | error("no more sessions"); | |
2157 | return 0; | |
2158 | } | |
2159 | s->authctxt = authctxt; | |
2160 | s->pw = authctxt->pw; | |
540d72c3 | 2161 | if (s->pw == NULL || !authctxt->valid) |
3c0ef626 | 2162 | fatal("no user for session %d", s->self); |
2163 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
2164 | s->chanid = chanid; | |
2165 | return 1; | |
2166 | } | |
2167 | ||
350391c5 | 2168 | Session * |
2169 | session_by_tty(char *tty) | |
2170 | { | |
2171 | int i; | |
5156b1a1 | 2172 | for (i = 0; i < sessions_nalloc; i++) { |
350391c5 | 2173 | Session *s = &sessions[i]; |
2174 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
2175 | debug("session_by_tty: session %d tty %s", i, tty); | |
2176 | return s; | |
2177 | } | |
2178 | } | |
2179 | debug("session_by_tty: unknown tty %.100s", tty); | |
2180 | session_dump(); | |
2181 | return NULL; | |
2182 | } | |
2183 | ||
3c0ef626 | 2184 | static Session * |
2185 | session_by_channel(int id) | |
2186 | { | |
2187 | int i; | |
5156b1a1 | 2188 | for (i = 0; i < sessions_nalloc; i++) { |
3c0ef626 | 2189 | Session *s = &sessions[i]; |
2190 | if (s->used && s->chanid == id) { | |
5156b1a1 | 2191 | debug("session_by_channel: session %d channel %d", |
2192 | i, id); | |
3c0ef626 | 2193 | return s; |
2194 | } | |
2195 | } | |
2196 | debug("session_by_channel: unknown channel %d", id); | |
2197 | session_dump(); | |
2198 | return NULL; | |
2199 | } | |
2200 | ||
2ce0bfe4 | 2201 | static Session * |
2202 | session_by_x11_channel(int id) | |
2203 | { | |
2204 | int i, j; | |
2205 | ||
5156b1a1 | 2206 | for (i = 0; i < sessions_nalloc; i++) { |
2ce0bfe4 | 2207 | Session *s = &sessions[i]; |
2208 | ||
2209 | if (s->x11_chanids == NULL || !s->used) | |
2210 | continue; | |
2211 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
2212 | if (s->x11_chanids[j] == id) { | |
2213 | debug("session_by_x11_channel: session %d " | |
2214 | "channel %d", s->self, id); | |
2215 | return s; | |
2216 | } | |
2217 | } | |
2218 | } | |
2219 | debug("session_by_x11_channel: unknown channel %d", id); | |
2220 | session_dump(); | |
2221 | return NULL; | |
2222 | } | |
2223 | ||
3c0ef626 | 2224 | static Session * |
2225 | session_by_pid(pid_t pid) | |
2226 | { | |
2227 | int i; | |
44a053a3 | 2228 | debug("session_by_pid: pid %ld", (long)pid); |
5156b1a1 | 2229 | for (i = 0; i < sessions_nalloc; i++) { |
3c0ef626 | 2230 | Session *s = &sessions[i]; |
2231 | if (s->used && s->pid == pid) | |
2232 | return s; | |
2233 | } | |
44a053a3 | 2234 | error("session_by_pid: unknown pid %ld", (long)pid); |
3c0ef626 | 2235 | session_dump(); |
2236 | return NULL; | |
2237 | } | |
2238 | ||
2239 | static int | |
2240 | session_window_change_req(Session *s) | |
2241 | { | |
2242 | s->col = packet_get_int(); | |
2243 | s->row = packet_get_int(); | |
2244 | s->xpixel = packet_get_int(); | |
2245 | s->ypixel = packet_get_int(); | |
e9702f7d | 2246 | packet_check_eom(); |
3c0ef626 | 2247 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
2248 | return 1; | |
2249 | } | |
2250 | ||
2251 | static int | |
2252 | session_pty_req(Session *s) | |
2253 | { | |
2254 | u_int len; | |
2255 | int n_bytes; | |
2256 | ||
2257 | if (no_pty_flag) { | |
2258 | debug("Allocating a pty not permitted for this authentication."); | |
2259 | return 0; | |
2260 | } | |
2261 | if (s->ttyfd != -1) { | |
2262 | packet_disconnect("Protocol error: you already have a pty."); | |
2263 | return 0; | |
2264 | } | |
2265 | ||
2266 | s->term = packet_get_string(&len); | |
2267 | ||
2268 | if (compat20) { | |
2269 | s->col = packet_get_int(); | |
2270 | s->row = packet_get_int(); | |
2271 | } else { | |
2272 | s->row = packet_get_int(); | |
2273 | s->col = packet_get_int(); | |
2274 | } | |
2275 | s->xpixel = packet_get_int(); | |
2276 | s->ypixel = packet_get_int(); | |
2277 | ||
2278 | if (strcmp(s->term, "") == 0) { | |
2279 | xfree(s->term); | |
2280 | s->term = NULL; | |
2281 | } | |
2282 | ||
2283 | /* Allocate a pty and open it. */ | |
2284 | debug("Allocating pty."); | |
5156b1a1 | 2285 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, |
2286 | sizeof(s->tty)))) { | |
3c0ef626 | 2287 | if (s->term) |
2288 | xfree(s->term); | |
2289 | s->term = NULL; | |
2290 | s->ptyfd = -1; | |
2291 | s->ttyfd = -1; | |
2292 | error("session_pty_req: session %d alloc failed", s->self); | |
2293 | return 0; | |
2294 | } | |
2295 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
2296 | ||
2297 | /* for SSH1 the tty modes length is not given */ | |
2298 | if (!compat20) | |
2299 | n_bytes = packet_remaining(); | |
2300 | tty_parse_modes(s->ttyfd, &n_bytes); | |
2301 | ||
350391c5 | 2302 | if (!use_privsep) |
2303 | pty_setowner(s->pw, s->tty); | |
3c0ef626 | 2304 | |
2305 | /* Set window size from the packet. */ | |
2306 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
2307 | ||
e9702f7d | 2308 | packet_check_eom(); |
3c0ef626 | 2309 | session_proctitle(s); |
2310 | return 1; | |
2311 | } | |
2312 | ||
2313 | static int | |
2314 | session_subsystem_req(Session *s) | |
2315 | { | |
2316 | struct stat st; | |
2317 | u_int len; | |
2318 | int success = 0; | |
30460aeb | 2319 | char *prog, *cmd, *subsys = packet_get_string(&len); |
2ce0bfe4 | 2320 | u_int i; |
3c0ef626 | 2321 | |
e9702f7d | 2322 | packet_check_eom(); |
7cac2b65 | 2323 | logit("subsystem request for %.100s", subsys); |
3c0ef626 | 2324 | |
2325 | for (i = 0; i < options.num_subsystems; i++) { | |
2326 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { | |
30460aeb | 2327 | prog = options.subsystem_command[i]; |
2328 | cmd = options.subsystem_args[i]; | |
e74dc197 | 2329 | if (!strcmp(INTERNAL_SFTP_NAME, prog)) { |
2330 | s->is_subsystem = SUBSYSTEM_INT_SFTP; | |
2331 | } else if (stat(prog, &st) < 0) { | |
30460aeb | 2332 | error("subsystem: cannot stat %s: %s", prog, |
3c0ef626 | 2333 | strerror(errno)); |
2334 | break; | |
e74dc197 | 2335 | } else { |
2336 | s->is_subsystem = SUBSYSTEM_EXT; | |
3c0ef626 | 2337 | } |
2338 | debug("subsystem: exec() %s", cmd); | |
5156b1a1 | 2339 | success = do_exec(s, cmd) == 0; |
e9702f7d | 2340 | break; |
3c0ef626 | 2341 | } |
2342 | } | |
2343 | ||
2344 | if (!success) | |
7cac2b65 | 2345 | logit("subsystem request for %.100s failed, subsystem not found", |
3c0ef626 | 2346 | subsys); |
2347 | ||
2348 | xfree(subsys); | |
2349 | return success; | |
2350 | } | |
2351 | ||
2352 | static int | |
2353 | session_x11_req(Session *s) | |
2354 | { | |
2355 | int success; | |
2356 | ||
2ce0bfe4 | 2357 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
2358 | error("session_x11_req: session %d: " | |
08822d99 | 2359 | "x11 forwarding already active", s->self); |
2ce0bfe4 | 2360 | return 0; |
2361 | } | |
3c0ef626 | 2362 | s->single_connection = packet_get_char(); |
2363 | s->auth_proto = packet_get_string(NULL); | |
2364 | s->auth_data = packet_get_string(NULL); | |
2365 | s->screen = packet_get_int(); | |
e9702f7d | 2366 | packet_check_eom(); |
3c0ef626 | 2367 | |
2368 | success = session_setup_x11fwd(s); | |
2369 | if (!success) { | |
2370 | xfree(s->auth_proto); | |
2371 | xfree(s->auth_data); | |
2372 | s->auth_proto = NULL; | |
2373 | s->auth_data = NULL; | |
2374 | } | |
2375 | return success; | |
2376 | } | |
2377 | ||
2378 | static int | |
2379 | session_shell_req(Session *s) | |
2380 | { | |
e9702f7d | 2381 | packet_check_eom(); |
5156b1a1 | 2382 | return do_exec(s, NULL) == 0; |
3c0ef626 | 2383 | } |
2384 | ||
2385 | static int | |
2386 | session_exec_req(Session *s) | |
2387 | { | |
5156b1a1 | 2388 | u_int len, success; |
2389 | ||
3c0ef626 | 2390 | char *command = packet_get_string(&len); |
e9702f7d | 2391 | packet_check_eom(); |
5156b1a1 | 2392 | success = do_exec(s, command) == 0; |
3c0ef626 | 2393 | xfree(command); |
5156b1a1 | 2394 | return success; |
3c0ef626 | 2395 | } |
2396 | ||
7cac2b65 | 2397 | static int |
2398 | session_break_req(Session *s) | |
2399 | { | |
7cac2b65 | 2400 | |
7e82606e | 2401 | packet_get_int(); /* ignored */ |
7cac2b65 | 2402 | packet_check_eom(); |
2403 | ||
5156b1a1 | 2404 | if (s->ttyfd == -1 || tcsendbreak(s->ttyfd, 0) < 0) |
7cac2b65 | 2405 | return 0; |
2406 | return 1; | |
2407 | } | |
2408 | ||
7e82606e | 2409 | static int |
2410 | session_env_req(Session *s) | |
2411 | { | |
2412 | char *name, *val; | |
2413 | u_int name_len, val_len, i; | |
2414 | ||
2415 | name = packet_get_string(&name_len); | |
2416 | val = packet_get_string(&val_len); | |
2417 | packet_check_eom(); | |
2418 | ||
2419 | /* Don't set too many environment variables */ | |
2420 | if (s->num_env > 128) { | |
2421 | debug2("Ignoring env request %s: too many env vars", name); | |
2422 | goto fail; | |
2423 | } | |
2424 | ||
2425 | for (i = 0; i < options.num_accept_env; i++) { | |
2426 | if (match_pattern(name, options.accept_env[i])) { | |
2427 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
30460aeb | 2428 | s->env = xrealloc(s->env, s->num_env + 1, |
2429 | sizeof(*s->env)); | |
7e82606e | 2430 | s->env[s->num_env].name = name; |
2431 | s->env[s->num_env].val = val; | |
2432 | s->num_env++; | |
2433 | return (1); | |
2434 | } | |
2435 | } | |
2436 | debug2("Ignoring env request %s: disallowed name", name); | |
2437 | ||
2438 | fail: | |
2439 | xfree(name); | |
2440 | xfree(val); | |
2441 | return (0); | |
2442 | } | |
2443 | ||
3c0ef626 | 2444 | static int |
2445 | session_auth_agent_req(Session *s) | |
2446 | { | |
2447 | static int called = 0; | |
e9702f7d | 2448 | packet_check_eom(); |
5156b1a1 | 2449 | if (no_agent_forwarding_flag || !options.allow_agent_forwarding) { |
3c0ef626 | 2450 | debug("session_auth_agent_req: no_agent_forwarding_flag"); |
2451 | return 0; | |
2452 | } | |
2453 | if (called) { | |
2454 | return 0; | |
2455 | } else { | |
2456 | called = 1; | |
2457 | return auth_input_request_forwarding(s->pw); | |
2458 | } | |
2459 | } | |
2460 | ||
e9702f7d | 2461 | int |
2462 | session_input_channel_req(Channel *c, const char *rtype) | |
3c0ef626 | 2463 | { |
3c0ef626 | 2464 | int success = 0; |
3c0ef626 | 2465 | Session *s; |
3c0ef626 | 2466 | |
e9702f7d | 2467 | if ((s = session_by_channel(c->self)) == NULL) { |
7cac2b65 | 2468 | logit("session_input_channel_req: no session %d req %.100s", |
e9702f7d | 2469 | c->self, rtype); |
2470 | return 0; | |
2471 | } | |
2472 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
3c0ef626 | 2473 | |
2474 | /* | |
2475 | * a session is in LARVAL state until a shell, a command | |
2476 | * or a subsystem is executed | |
2477 | */ | |
2478 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2479 | if (strcmp(rtype, "shell") == 0) { | |
2480 | success = session_shell_req(s); | |
2481 | } else if (strcmp(rtype, "exec") == 0) { | |
2482 | success = session_exec_req(s); | |
2483 | } else if (strcmp(rtype, "pty-req") == 0) { | |
0b90ac93 | 2484 | success = session_pty_req(s); |
3c0ef626 | 2485 | } else if (strcmp(rtype, "x11-req") == 0) { |
2486 | success = session_x11_req(s); | |
2487 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { | |
2488 | success = session_auth_agent_req(s); | |
2489 | } else if (strcmp(rtype, "subsystem") == 0) { | |
2490 | success = session_subsystem_req(s); | |
7e82606e | 2491 | } else if (strcmp(rtype, "env") == 0) { |
2492 | success = session_env_req(s); | |
3c0ef626 | 2493 | } |
2494 | } | |
2495 | if (strcmp(rtype, "window-change") == 0) { | |
2496 | success = session_window_change_req(s); | |
7e82606e | 2497 | } else if (strcmp(rtype, "break") == 0) { |
2498 | success = session_break_req(s); | |
3c0ef626 | 2499 | } |
7e82606e | 2500 | |
e9702f7d | 2501 | return success; |
3c0ef626 | 2502 | } |
2503 | ||
2504 | void | |
5156b1a1 | 2505 | session_set_fds(Session *s, int fdin, int fdout, int fderr, int is_tty) |
3c0ef626 | 2506 | { |
2507 | if (!compat20) | |
2508 | fatal("session_set_fds: called for proto != 2.0"); | |
2509 | /* | |
2510 | * now that have a child and a pipe to the child, | |
2511 | * we can activate our channel and register the fd's | |
2512 | */ | |
2513 | if (s->chanid == -1) | |
2514 | fatal("no channel for session %d", s->self); | |
6df46d40 | 2515 | channel_set_fds(s->chanid, |
2516 | fdout, fdin, fderr, | |
2517 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
5156b1a1 | 2518 | 1, is_tty, CHAN_SES_WINDOW_DEFAULT); |
3c0ef626 | 2519 | } |
2520 | ||
2521 | /* | |
2522 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2523 | * (e.g., due to a dropped connection). | |
2524 | */ | |
350391c5 | 2525 | void |
540d72c3 | 2526 | session_pty_cleanup2(Session *s) |
3c0ef626 | 2527 | { |
3c0ef626 | 2528 | if (s == NULL) { |
2529 | error("session_pty_cleanup: no session"); | |
2530 | return; | |
2531 | } | |
2532 | if (s->ttyfd == -1) | |
2533 | return; | |
2534 | ||
2535 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); | |
2536 | ||
2537 | /* Record that the user has logged out. */ | |
2538 | if (s->pid != 0) | |
e9702f7d | 2539 | record_logout(s->pid, s->tty, s->pw->pw_name); |
3c0ef626 | 2540 | |
2541 | /* Release the pseudo-tty. */ | |
350391c5 | 2542 | if (getuid() == 0) |
2543 | pty_release(s->tty); | |
3c0ef626 | 2544 | |
2545 | /* | |
2546 | * Close the server side of the socket pairs. We must do this after | |
2547 | * the pty cleanup, so that another process doesn't get this pty | |
2548 | * while we're still cleaning up. | |
2549 | */ | |
5156b1a1 | 2550 | if (s->ptymaster != -1 && close(s->ptymaster) < 0) |
2551 | error("close(s->ptymaster/%d): %s", | |
2552 | s->ptymaster, strerror(errno)); | |
3c0ef626 | 2553 | |
2554 | /* unlink pty from session */ | |
2555 | s->ttyfd = -1; | |
2556 | } | |
2557 | ||
350391c5 | 2558 | void |
540d72c3 | 2559 | session_pty_cleanup(Session *s) |
350391c5 | 2560 | { |
540d72c3 | 2561 | PRIVSEP(session_pty_cleanup2(s)); |
350391c5 | 2562 | } |
2563 | ||
d03f4262 | 2564 | static char * |
2565 | sig2name(int sig) | |
2566 | { | |
2567 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2568 | SSH_SIG(ABRT); | |
2569 | SSH_SIG(ALRM); | |
2570 | SSH_SIG(FPE); | |
2571 | SSH_SIG(HUP); | |
2572 | SSH_SIG(ILL); | |
2573 | SSH_SIG(INT); | |
2574 | SSH_SIG(KILL); | |
2575 | SSH_SIG(PIPE); | |
2576 | SSH_SIG(QUIT); | |
2577 | SSH_SIG(SEGV); | |
2578 | SSH_SIG(TERM); | |
2579 | SSH_SIG(USR1); | |
2580 | SSH_SIG(USR2); | |
2581 | #undef SSH_SIG | |
2582 | return "SIG@openssh.com"; | |
2583 | } | |
2584 | ||
2ce0bfe4 | 2585 | static void |
2586 | session_close_x11(int id) | |
2587 | { | |
2588 | Channel *c; | |
2589 | ||
08822d99 | 2590 | if ((c = channel_by_id(id)) == NULL) { |
2ce0bfe4 | 2591 | debug("session_close_x11: x11 channel %d missing", id); |
2592 | } else { | |
2593 | /* Detach X11 listener */ | |
2594 | debug("session_close_x11: detach x11 channel %d", id); | |
2595 | channel_cancel_cleanup(id); | |
2596 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2597 | chan_mark_dead(c); | |
2598 | } | |
2599 | } | |
2600 | ||
2601 | static void | |
2602 | session_close_single_x11(int id, void *arg) | |
2603 | { | |
2604 | Session *s; | |
2605 | u_int i; | |
2606 | ||
2607 | debug3("session_close_single_x11: channel %d", id); | |
2608 | channel_cancel_cleanup(id); | |
0b90ac93 | 2609 | if ((s = session_by_x11_channel(id)) == NULL) |
2ce0bfe4 | 2610 | fatal("session_close_single_x11: no x11 channel %d", id); |
2611 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2612 | debug("session_close_single_x11: session %d: " | |
2613 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2614 | /* | |
2615 | * The channel "id" is already closing, but make sure we | |
2616 | * close all of its siblings. | |
2617 | */ | |
2618 | if (s->x11_chanids[i] != id) | |
2619 | session_close_x11(s->x11_chanids[i]); | |
2620 | } | |
2621 | xfree(s->x11_chanids); | |
2622 | s->x11_chanids = NULL; | |
2623 | if (s->display) { | |
2624 | xfree(s->display); | |
2625 | s->display = NULL; | |
2626 | } | |
2627 | if (s->auth_proto) { | |
2628 | xfree(s->auth_proto); | |
2629 | s->auth_proto = NULL; | |
2630 | } | |
2631 | if (s->auth_data) { | |
2632 | xfree(s->auth_data); | |
2633 | s->auth_data = NULL; | |
2634 | } | |
2635 | if (s->auth_display) { | |
2636 | xfree(s->auth_display); | |
2637 | s->auth_display = NULL; | |
2638 | } | |
2639 | } | |
2640 | ||
3c0ef626 | 2641 | static void |
2642 | session_exit_message(Session *s, int status) | |
2643 | { | |
2644 | Channel *c; | |
e9702f7d | 2645 | |
2646 | if ((c = channel_lookup(s->chanid)) == NULL) | |
3c0ef626 | 2647 | fatal("session_exit_message: session %d: no channel %d", |
2648 | s->self, s->chanid); | |
44a053a3 | 2649 | debug("session_exit_message: session %d channel %d pid %ld", |
2650 | s->self, s->chanid, (long)s->pid); | |
3c0ef626 | 2651 | |
2652 | if (WIFEXITED(status)) { | |
e9702f7d | 2653 | channel_request_start(s->chanid, "exit-status", 0); |
3c0ef626 | 2654 | packet_put_int(WEXITSTATUS(status)); |
2655 | packet_send(); | |
2656 | } else if (WIFSIGNALED(status)) { | |
e9702f7d | 2657 | channel_request_start(s->chanid, "exit-signal", 0); |
d03f4262 | 2658 | packet_put_cstring(sig2name(WTERMSIG(status))); |
3c0ef626 | 2659 | #ifdef WCOREDUMP |
e74dc197 | 2660 | packet_put_char(WCOREDUMP(status)? 1 : 0); |
3c0ef626 | 2661 | #else /* WCOREDUMP */ |
2662 | packet_put_char(0); | |
2663 | #endif /* WCOREDUMP */ | |
2664 | packet_put_cstring(""); | |
2665 | packet_put_cstring(""); | |
2666 | packet_send(); | |
2667 | } else { | |
2668 | /* Some weird exit cause. Just exit. */ | |
2669 | packet_disconnect("wait returned status %04x.", status); | |
2670 | } | |
2671 | ||
2672 | /* disconnect channel */ | |
2673 | debug("session_exit_message: release channel %d", s->chanid); | |
08822d99 | 2674 | |
2675 | /* | |
2676 | * Adjust cleanup callback attachment to send close messages when | |
30460aeb | 2677 | * the channel gets EOF. The session will be then be closed |
08822d99 | 2678 | * by session_close_by_channel when the childs close their fds. |
2679 | */ | |
2680 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2681 | ||
3c0ef626 | 2682 | /* |
2683 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2684 | * interested in data we write. | |
2685 | * Note that we must not call 'chan_read_failed', since there could | |
2686 | * be some more data waiting in the pipe. | |
2687 | */ | |
2688 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2689 | chan_write_failed(c); | |
3c0ef626 | 2690 | } |
2691 | ||
350391c5 | 2692 | void |
3c0ef626 | 2693 | session_close(Session *s) |
2694 | { | |
2ce0bfe4 | 2695 | u_int i; |
7e82606e | 2696 | |
44a053a3 | 2697 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
540d72c3 | 2698 | if (s->ttyfd != -1) |
3c0ef626 | 2699 | session_pty_cleanup(s); |
3c0ef626 | 2700 | if (s->term) |
2701 | xfree(s->term); | |
2702 | if (s->display) | |
2703 | xfree(s->display); | |
2ce0bfe4 | 2704 | if (s->x11_chanids) |
2705 | xfree(s->x11_chanids); | |
e9702f7d | 2706 | if (s->auth_display) |
2707 | xfree(s->auth_display); | |
3c0ef626 | 2708 | if (s->auth_data) |
2709 | xfree(s->auth_data); | |
2710 | if (s->auth_proto) | |
2711 | xfree(s->auth_proto); | |
30460aeb | 2712 | if (s->env != NULL) { |
2713 | for (i = 0; i < s->num_env; i++) { | |
2714 | xfree(s->env[i].name); | |
2715 | xfree(s->env[i].val); | |
2716 | } | |
7e82606e | 2717 | xfree(s->env); |
30460aeb | 2718 | } |
3c0ef626 | 2719 | session_proctitle(s); |
5156b1a1 | 2720 | session_unused(s->self); |
3c0ef626 | 2721 | } |
2722 | ||
2723 | void | |
2724 | session_close_by_pid(pid_t pid, int status) | |
2725 | { | |
2726 | Session *s = session_by_pid(pid); | |
2727 | if (s == NULL) { | |
44a053a3 | 2728 | debug("session_close_by_pid: no session for pid %ld", |
2729 | (long)pid); | |
3c0ef626 | 2730 | return; |
2731 | } | |
2732 | if (s->chanid != -1) | |
2733 | session_exit_message(s, status); | |
08822d99 | 2734 | if (s->ttyfd != -1) |
2735 | session_pty_cleanup(s); | |
4b6dae8f | 2736 | s->pid = 0; |
3c0ef626 | 2737 | } |
2738 | ||
2739 | /* | |
2740 | * this is called when a channel dies before | |
2741 | * the session 'child' itself dies | |
2742 | */ | |
2743 | void | |
2744 | session_close_by_channel(int id, void *arg) | |
2745 | { | |
2746 | Session *s = session_by_channel(id); | |
08822d99 | 2747 | u_int i; |
2ce0bfe4 | 2748 | |
3c0ef626 | 2749 | if (s == NULL) { |
2750 | debug("session_close_by_channel: no session for id %d", id); | |
2751 | return; | |
2752 | } | |
44a053a3 | 2753 | debug("session_close_by_channel: channel %d child %ld", |
2754 | id, (long)s->pid); | |
3c0ef626 | 2755 | if (s->pid != 0) { |
2756 | debug("session_close_by_channel: channel %d: has child", id); | |
2757 | /* | |
2758 | * delay detach of session, but release pty, since | |
2759 | * the fd's to the child are already closed | |
2760 | */ | |
540d72c3 | 2761 | if (s->ttyfd != -1) |
3c0ef626 | 2762 | session_pty_cleanup(s); |
3c0ef626 | 2763 | return; |
2764 | } | |
2765 | /* detach by removing callback */ | |
2766 | channel_cancel_cleanup(s->chanid); | |
08822d99 | 2767 | |
2768 | /* Close any X11 listeners associated with this session */ | |
2769 | if (s->x11_chanids != NULL) { | |
2770 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2771 | session_close_x11(s->x11_chanids[i]); | |
2772 | s->x11_chanids[i] = -1; | |
2773 | } | |
2774 | } | |
2775 | ||
3c0ef626 | 2776 | s->chanid = -1; |
2777 | session_close(s); | |
2778 | } | |
2779 | ||
2780 | void | |
350391c5 | 2781 | session_destroy_all(void (*closefunc)(Session *)) |
3c0ef626 | 2782 | { |
2783 | int i; | |
5156b1a1 | 2784 | for (i = 0; i < sessions_nalloc; i++) { |
3c0ef626 | 2785 | Session *s = &sessions[i]; |
350391c5 | 2786 | if (s->used) { |
2787 | if (closefunc != NULL) | |
2788 | closefunc(s); | |
2789 | else | |
2790 | session_close(s); | |
2791 | } | |
3c0ef626 | 2792 | } |
2793 | } | |
2794 | ||
2795 | static char * | |
2796 | session_tty_list(void) | |
2797 | { | |
2798 | static char buf[1024]; | |
2799 | int i; | |
bfe49944 | 2800 | char *cp; |
2801 | ||
3c0ef626 | 2802 | buf[0] = '\0'; |
5156b1a1 | 2803 | for (i = 0; i < sessions_nalloc; i++) { |
3c0ef626 | 2804 | Session *s = &sessions[i]; |
2805 | if (s->used && s->ttyfd != -1) { | |
540d72c3 | 2806 | |
bfe49944 | 2807 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2808 | cp = strrchr(s->tty, '/'); | |
2809 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2810 | } else | |
2811 | cp = s->tty + 5; | |
540d72c3 | 2812 | |
3c0ef626 | 2813 | if (buf[0] != '\0') |
2814 | strlcat(buf, ",", sizeof buf); | |
bfe49944 | 2815 | strlcat(buf, cp, sizeof buf); |
3c0ef626 | 2816 | } |
2817 | } | |
2818 | if (buf[0] == '\0') | |
2819 | strlcpy(buf, "notty", sizeof buf); | |
2820 | return buf; | |
2821 | } | |
2822 | ||
2823 | void | |
2824 | session_proctitle(Session *s) | |
2825 | { | |
2826 | if (s->pw == NULL) | |
2827 | error("no user for session %d", s->self); | |
2828 | else | |
2829 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2830 | } | |
2831 | ||
2832 | int | |
2833 | session_setup_x11fwd(Session *s) | |
2834 | { | |
2835 | struct stat st; | |
e9702f7d | 2836 | char display[512], auth_display[512]; |
2837 | char hostname[MAXHOSTNAMELEN]; | |
2ce0bfe4 | 2838 | u_int i; |
3c0ef626 | 2839 | |
2840 | if (no_x11_forwarding_flag) { | |
2841 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2842 | return 0; | |
2843 | } | |
2844 | if (!options.x11_forwarding) { | |
2845 | debug("X11 forwarding disabled in server configuration file."); | |
2846 | return 0; | |
2847 | } | |
2848 | if (!options.xauth_location || | |
2849 | (stat(options.xauth_location, &st) == -1)) { | |
2850 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2851 | return 0; | |
2852 | } | |
2853 | if (options.use_login) { | |
2854 | packet_send_debug("X11 forwarding disabled; " | |
2855 | "not compatible with UseLogin=yes."); | |
2856 | return 0; | |
2857 | } | |
2858 | if (s->display != NULL) { | |
2859 | debug("X11 display already set."); | |
2860 | return 0; | |
2861 | } | |
276b07a3 | 2862 | if (x11_create_display_inet(options.x11_display_offset, |
2863 | options.x11_use_localhost, s->single_connection, | |
a7213e65 | 2864 | &s->display_number, &s->x11_chanids, |
2865 | options.hpn_disabled, options.hpn_buffer_size) == -1) { | |
3c0ef626 | 2866 | debug("x11_create_display_inet failed."); |
2867 | return 0; | |
2868 | } | |
2ce0bfe4 | 2869 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2870 | channel_register_cleanup(s->x11_chanids[i], | |
08822d99 | 2871 | session_close_single_x11, 0); |
2ce0bfe4 | 2872 | } |
e9702f7d | 2873 | |
2874 | /* Set up a suitable value for the DISPLAY variable. */ | |
2875 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2876 | fatal("gethostname: %.100s", strerror(errno)); | |
2877 | /* | |
2878 | * auth_display must be used as the displayname when the | |
2879 | * authorization entry is added with xauth(1). This will be | |
2880 | * different than the DISPLAY string for localhost displays. | |
2881 | */ | |
2882 | if (options.x11_use_localhost) { | |
276b07a3 | 2883 | snprintf(display, sizeof display, "localhost:%u.%u", |
e9702f7d | 2884 | s->display_number, s->screen); |
276b07a3 | 2885 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
e9702f7d | 2886 | s->display_number, s->screen); |
2887 | s->display = xstrdup(display); | |
2888 | s->auth_display = xstrdup(auth_display); | |
2889 | } else { | |
2890 | #ifdef IPADDR_IN_DISPLAY | |
2891 | struct hostent *he; | |
2892 | struct in_addr my_addr; | |
2893 | ||
2894 | he = gethostbyname(hostname); | |
2895 | if (he == NULL) { | |
2896 | error("Can't get IP address for X11 DISPLAY."); | |
2897 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2898 | return 0; | |
2899 | } | |
2900 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
276b07a3 | 2901 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
e9702f7d | 2902 | s->display_number, s->screen); |
2903 | #else | |
276b07a3 | 2904 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
e9702f7d | 2905 | s->display_number, s->screen); |
2906 | #endif | |
2907 | s->display = xstrdup(display); | |
2908 | s->auth_display = xstrdup(display); | |
2909 | } | |
2910 | ||
3c0ef626 | 2911 | return 1; |
2912 | } | |
2913 | ||
2914 | static void | |
2915 | do_authenticated2(Authctxt *authctxt) | |
2916 | { | |
2917 | server_loop2(authctxt); | |
540d72c3 | 2918 | } |
2919 | ||
2920 | void | |
2921 | do_cleanup(Authctxt *authctxt) | |
2922 | { | |
2923 | static int called = 0; | |
2924 | ||
2925 | debug("do_cleanup"); | |
2926 | ||
2927 | /* no cleanup if we're in the child for login shell */ | |
2928 | if (is_child) | |
2929 | return; | |
2930 | ||
2931 | /* avoid double cleanup */ | |
2932 | if (called) | |
2933 | return; | |
2934 | called = 1; | |
2935 | ||
fa0f0f45 | 2936 | if (authctxt == NULL) |
540d72c3 | 2937 | return; |
fa0f0f45 | 2938 | |
2939 | #ifdef USE_PAM | |
2940 | if (options.use_pam) { | |
2941 | sshpam_cleanup(); | |
2942 | sshpam_thread_cleanup(); | |
2943 | } | |
2944 | #endif | |
2945 | ||
2946 | if (!authctxt->authenticated) | |
2947 | return; | |
2948 | ||
540d72c3 | 2949 | #ifdef KRB5 |
2950 | if (options.kerberos_ticket_cleanup && | |
2951 | authctxt->krb5_ctx) | |
2952 | krb5_cleanup_proc(authctxt); | |
5598e598 | 2953 | #endif |
540d72c3 | 2954 | |
2955 | #ifdef GSSAPI | |
2956 | if (compat20 && options.gss_cleanup_creds) | |
2957 | ssh_gssapi_cleanup_creds(); | |
2958 | #endif | |
2959 | ||
540d72c3 | 2960 | /* remove agent socket */ |
2961 | auth_sock_cleanup_proc(authctxt->pw); | |
2962 | ||
2963 | /* | |
2964 | * Cleanup ptys/utmp only if privsep is disabled, | |
2965 | * or if running in monitor. | |
2966 | */ | |
2967 | if (!use_privsep || mm_is_monitor()) | |
2968 | session_destroy_all(session_pty_cleanup2); | |
3c0ef626 | 2969 | } |