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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, |
d3057ca4 | 399 | options.gateway_ports) < 0) { |
30460aeb | 400 | debug("Port forwarding failed."); |
401 | break; | |
402 | } | |
3c0ef626 | 403 | success = 1; |
404 | break; | |
405 | ||
406 | case SSH_CMSG_MAX_PACKET_SIZE: | |
407 | if (packet_set_maxsize(packet_get_int()) > 0) | |
408 | success = 1; | |
409 | break; | |
e9702f7d | 410 | |
3c0ef626 | 411 | case SSH_CMSG_EXEC_SHELL: |
412 | case SSH_CMSG_EXEC_CMD: | |
413 | if (type == SSH_CMSG_EXEC_CMD) { | |
414 | command = packet_get_string(&dlen); | |
415 | debug("Exec command '%.500s'", command); | |
5156b1a1 | 416 | if (do_exec(s, command) != 0) |
417 | packet_disconnect( | |
418 | "command execution failed"); | |
3c0ef626 | 419 | xfree(command); |
420 | } else { | |
5156b1a1 | 421 | if (do_exec(s, NULL) != 0) |
422 | packet_disconnect( | |
423 | "shell execution failed"); | |
3c0ef626 | 424 | } |
e9702f7d | 425 | packet_check_eom(); |
3c0ef626 | 426 | session_close(s); |
427 | return; | |
428 | ||
429 | default: | |
430 | /* | |
431 | * Any unknown messages in this phase are ignored, | |
432 | * and a failure message is returned. | |
433 | */ | |
7cac2b65 | 434 | logit("Unknown packet type received after authentication: %d", type); |
3c0ef626 | 435 | } |
436 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
437 | packet_send(); | |
438 | packet_write_wait(); | |
439 | ||
440 | /* Enable compression now that we have replied if appropriate. */ | |
441 | if (enable_compression_after_reply) { | |
442 | enable_compression_after_reply = 0; | |
443 | packet_start_compression(compression_level); | |
444 | } | |
445 | } | |
446 | } | |
447 | ||
5156b1a1 | 448 | #define USE_PIPES |
3c0ef626 | 449 | /* |
450 | * This is called to fork and execute a command when we have no tty. This | |
451 | * will call do_child from the child, and server_loop from the parent after | |
452 | * setting up file descriptors and such. | |
453 | */ | |
5156b1a1 | 454 | int |
3c0ef626 | 455 | do_exec_no_pty(Session *s, const char *command) |
456 | { | |
44a053a3 | 457 | pid_t pid; |
3c0ef626 | 458 | |
459 | #ifdef USE_PIPES | |
460 | int pin[2], pout[2], perr[2]; | |
5156b1a1 | 461 | |
3c0ef626 | 462 | /* Allocate pipes for communicating with the program. */ |
5156b1a1 | 463 | if (pipe(pin) < 0) { |
464 | error("%s: pipe in: %.100s", __func__, strerror(errno)); | |
465 | return -1; | |
466 | } | |
467 | if (pipe(pout) < 0) { | |
468 | error("%s: pipe out: %.100s", __func__, strerror(errno)); | |
469 | close(pin[0]); | |
470 | close(pin[1]); | |
471 | return -1; | |
472 | } | |
473 | if (pipe(perr) < 0) { | |
474 | error("%s: pipe err: %.100s", __func__, strerror(errno)); | |
475 | close(pin[0]); | |
476 | close(pin[1]); | |
477 | close(pout[0]); | |
478 | close(pout[1]); | |
479 | return -1; | |
480 | } | |
481 | #else | |
3c0ef626 | 482 | int inout[2], err[2]; |
5156b1a1 | 483 | |
3c0ef626 | 484 | /* Uses socket pairs to communicate with the program. */ |
5156b1a1 | 485 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0) { |
486 | error("%s: socketpair #1: %.100s", __func__, strerror(errno)); | |
487 | return -1; | |
488 | } | |
489 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) { | |
490 | error("%s: socketpair #2: %.100s", __func__, strerror(errno)); | |
491 | close(inout[0]); | |
492 | close(inout[1]); | |
493 | return -1; | |
494 | } | |
495 | #endif | |
496 | ||
3c0ef626 | 497 | if (s == NULL) |
498 | fatal("do_exec_no_pty: no session"); | |
499 | ||
500 | session_proctitle(s); | |
501 | ||
3c0ef626 | 502 | /* Fork the child. */ |
5156b1a1 | 503 | switch ((pid = fork())) { |
504 | case -1: | |
505 | error("%s: fork: %.100s", __func__, strerror(errno)); | |
506 | #ifdef USE_PIPES | |
507 | close(pin[0]); | |
508 | close(pin[1]); | |
509 | close(pout[0]); | |
510 | close(pout[1]); | |
511 | close(perr[0]); | |
512 | close(perr[1]); | |
513 | #else | |
514 | close(inout[0]); | |
515 | close(inout[1]); | |
516 | close(err[0]); | |
517 | close(err[1]); | |
518 | #endif | |
519 | return -1; | |
520 | case 0: | |
540d72c3 | 521 | is_child = 1; |
d03f4262 | 522 | |
3c0ef626 | 523 | /* Child. Reinitialize the log since the pid has changed. */ |
5156b1a1 | 524 | log_init(__progname, options.log_level, |
525 | options.log_facility, log_stderr); | |
3c0ef626 | 526 | |
527 | /* | |
528 | * Create a new session and process group since the 4.4BSD | |
529 | * setlogin() affects the entire process group. | |
530 | */ | |
531 | if (setsid() < 0) | |
532 | error("setsid failed: %.100s", strerror(errno)); | |
533 | ||
534 | #ifdef USE_PIPES | |
535 | /* | |
536 | * Redirect stdin. We close the parent side of the socket | |
537 | * pair, and make the child side the standard input. | |
538 | */ | |
539 | close(pin[1]); | |
540 | if (dup2(pin[0], 0) < 0) | |
541 | perror("dup2 stdin"); | |
542 | close(pin[0]); | |
543 | ||
544 | /* Redirect stdout. */ | |
545 | close(pout[0]); | |
546 | if (dup2(pout[1], 1) < 0) | |
547 | perror("dup2 stdout"); | |
548 | close(pout[1]); | |
549 | ||
550 | /* Redirect stderr. */ | |
551 | close(perr[0]); | |
552 | if (dup2(perr[1], 2) < 0) | |
553 | perror("dup2 stderr"); | |
554 | close(perr[1]); | |
5156b1a1 | 555 | #else |
3c0ef626 | 556 | /* |
557 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
558 | * use the same socket, as some programs (particularly rdist) | |
559 | * seem to depend on it. | |
560 | */ | |
561 | close(inout[1]); | |
562 | close(err[1]); | |
563 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
564 | perror("dup2 stdin"); | |
5156b1a1 | 565 | if (dup2(inout[0], 1) < 0) /* stdout (same as stdin) */ |
3c0ef626 | 566 | perror("dup2 stdout"); |
5156b1a1 | 567 | close(inout[0]); |
3c0ef626 | 568 | if (dup2(err[0], 2) < 0) /* stderr */ |
569 | perror("dup2 stderr"); | |
5156b1a1 | 570 | close(err[0]); |
571 | #endif | |
572 | ||
3c0ef626 | 573 | |
d03f4262 | 574 | #ifdef _UNICOS |
575 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
576 | #endif | |
577 | ||
3c0ef626 | 578 | /* Do processing for the child (exec command etc). */ |
579 | do_child(s, command); | |
580 | /* NOTREACHED */ | |
5156b1a1 | 581 | default: |
582 | break; | |
3c0ef626 | 583 | } |
5156b1a1 | 584 | |
d03f4262 | 585 | #ifdef _UNICOS |
586 | signal(WJSIGNAL, cray_job_termination_handler); | |
587 | #endif /* _UNICOS */ | |
3c0ef626 | 588 | #ifdef HAVE_CYGWIN |
589 | if (is_winnt) | |
590 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
591 | #endif | |
5156b1a1 | 592 | |
3c0ef626 | 593 | s->pid = pid; |
594 | /* Set interactive/non-interactive mode. */ | |
595 | packet_set_interactive(s->display != NULL); | |
5156b1a1 | 596 | |
597 | /* | |
598 | * Clear loginmsg, since it's the child's responsibility to display | |
599 | * it to the user, otherwise multiple sessions may accumulate | |
600 | * multiple copies of the login messages. | |
601 | */ | |
602 | buffer_clear(&loginmsg); | |
603 | ||
3c0ef626 | 604 | #ifdef USE_PIPES |
605 | /* We are the parent. Close the child sides of the pipes. */ | |
606 | close(pin[0]); | |
607 | close(pout[1]); | |
608 | close(perr[1]); | |
609 | ||
610 | if (compat20) { | |
7e82606e | 611 | if (s->is_subsystem) { |
612 | close(perr[0]); | |
613 | perr[0] = -1; | |
614 | } | |
5156b1a1 | 615 | session_set_fds(s, pin[1], pout[0], perr[0], 0); |
3c0ef626 | 616 | } else { |
617 | /* Enter the interactive session. */ | |
618 | server_loop(pid, pin[1], pout[0], perr[0]); | |
619 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ | |
620 | } | |
5156b1a1 | 621 | #else |
3c0ef626 | 622 | /* We are the parent. Close the child sides of the socket pairs. */ |
623 | close(inout[0]); | |
624 | close(err[0]); | |
625 | ||
626 | /* | |
627 | * Enter the interactive session. Note: server_loop must be able to | |
628 | * handle the case that fdin and fdout are the same. | |
629 | */ | |
630 | if (compat20) { | |
5156b1a1 | 631 | session_set_fds(s, inout[1], inout[1], |
632 | s->is_subsystem ? -1 : err[1], 0); | |
633 | if (s->is_subsystem) | |
634 | close(err[1]); | |
3c0ef626 | 635 | } else { |
636 | server_loop(pid, inout[1], inout[1], err[1]); | |
637 | /* server_loop has closed inout[1] and err[1]. */ | |
638 | } | |
5156b1a1 | 639 | #endif |
640 | return 0; | |
3c0ef626 | 641 | } |
642 | ||
643 | /* | |
644 | * This is called to fork and execute a command when we have a tty. This | |
645 | * will call do_child from the child, and server_loop from the parent after | |
646 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
647 | * lastlog, and other such operations. | |
648 | */ | |
5156b1a1 | 649 | int |
3c0ef626 | 650 | do_exec_pty(Session *s, const char *command) |
651 | { | |
652 | int fdout, ptyfd, ttyfd, ptymaster; | |
653 | pid_t pid; | |
654 | ||
655 | if (s == NULL) | |
656 | fatal("do_exec_pty: no session"); | |
657 | ptyfd = s->ptyfd; | |
658 | ttyfd = s->ttyfd; | |
659 | ||
5156b1a1 | 660 | /* |
661 | * Create another descriptor of the pty master side for use as the | |
662 | * standard input. We could use the original descriptor, but this | |
663 | * simplifies code in server_loop. The descriptor is bidirectional. | |
664 | * Do this before forking (and cleanup in the child) so as to | |
665 | * detect and gracefully fail out-of-fd conditions. | |
666 | */ | |
667 | if ((fdout = dup(ptyfd)) < 0) { | |
668 | error("%s: dup #1: %s", __func__, strerror(errno)); | |
669 | close(ttyfd); | |
670 | close(ptyfd); | |
671 | return -1; | |
672 | } | |
673 | /* we keep a reference to the pty master */ | |
674 | if ((ptymaster = dup(ptyfd)) < 0) { | |
675 | error("%s: dup #2: %s", __func__, strerror(errno)); | |
676 | close(ttyfd); | |
677 | close(ptyfd); | |
678 | close(fdout); | |
679 | return -1; | |
680 | } | |
681 | ||
3c0ef626 | 682 | /* Fork the child. */ |
5156b1a1 | 683 | switch ((pid = fork())) { |
684 | case -1: | |
685 | error("%s: fork: %.100s", __func__, strerror(errno)); | |
686 | close(fdout); | |
687 | close(ptymaster); | |
688 | close(ttyfd); | |
689 | close(ptyfd); | |
690 | return -1; | |
691 | case 0: | |
540d72c3 | 692 | is_child = 1; |
3c0ef626 | 693 | |
5156b1a1 | 694 | close(fdout); |
695 | close(ptymaster); | |
696 | ||
3c0ef626 | 697 | /* Child. Reinitialize the log because the pid has changed. */ |
5156b1a1 | 698 | log_init(__progname, options.log_level, |
699 | options.log_facility, log_stderr); | |
3c0ef626 | 700 | /* Close the master side of the pseudo tty. */ |
701 | close(ptyfd); | |
702 | ||
703 | /* Make the pseudo tty our controlling tty. */ | |
704 | pty_make_controlling_tty(&ttyfd, s->tty); | |
705 | ||
706 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ | |
707 | if (dup2(ttyfd, 0) < 0) | |
708 | error("dup2 stdin: %s", strerror(errno)); | |
709 | if (dup2(ttyfd, 1) < 0) | |
710 | error("dup2 stdout: %s", strerror(errno)); | |
711 | if (dup2(ttyfd, 2) < 0) | |
712 | error("dup2 stderr: %s", strerror(errno)); | |
713 | ||
714 | /* Close the extra descriptor for the pseudo tty. */ | |
715 | close(ttyfd); | |
716 | ||
717 | /* record login, etc. similar to login(1) */ | |
718 | #ifndef HAVE_OSF_SIA | |
d03f4262 | 719 | if (!(options.use_login && command == NULL)) { |
720 | #ifdef _UNICOS | |
721 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
722 | #endif /* _UNICOS */ | |
3c0ef626 | 723 | do_login(s, command); |
d03f4262 | 724 | } |
3c0ef626 | 725 | # ifdef LOGIN_NEEDS_UTMPX |
726 | else | |
727 | do_pre_login(s); | |
728 | # endif | |
729 | #endif | |
5156b1a1 | 730 | /* |
731 | * Do common processing for the child, such as execing | |
732 | * the command. | |
733 | */ | |
734 | do_child(s, command); | |
735 | /* NOTREACHED */ | |
736 | default: | |
737 | break; | |
3c0ef626 | 738 | } |
5156b1a1 | 739 | |
d03f4262 | 740 | #ifdef _UNICOS |
741 | signal(WJSIGNAL, cray_job_termination_handler); | |
742 | #endif /* _UNICOS */ | |
3c0ef626 | 743 | #ifdef HAVE_CYGWIN |
744 | if (is_winnt) | |
745 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
746 | #endif | |
5156b1a1 | 747 | |
3c0ef626 | 748 | s->pid = pid; |
749 | ||
750 | /* Parent. Close the slave side of the pseudo tty. */ | |
751 | close(ttyfd); | |
752 | ||
3c0ef626 | 753 | /* Enter interactive session. */ |
5156b1a1 | 754 | s->ptymaster = ptymaster; |
3c0ef626 | 755 | packet_set_interactive(1); |
756 | if (compat20) { | |
5156b1a1 | 757 | session_set_fds(s, ptyfd, fdout, -1, 1); |
3c0ef626 | 758 | } else { |
759 | server_loop(pid, ptyfd, fdout, -1); | |
760 | /* server_loop _has_ closed ptyfd and fdout. */ | |
761 | } | |
5156b1a1 | 762 | return 0; |
3c0ef626 | 763 | } |
764 | ||
765 | #ifdef LOGIN_NEEDS_UTMPX | |
766 | static void | |
767 | do_pre_login(Session *s) | |
768 | { | |
769 | socklen_t fromlen; | |
770 | struct sockaddr_storage from; | |
771 | pid_t pid = getpid(); | |
772 | ||
773 | /* | |
774 | * Get IP address of client. If the connection is not a socket, let | |
775 | * the address be 0.0.0.0. | |
776 | */ | |
777 | memset(&from, 0, sizeof(from)); | |
d03f4262 | 778 | fromlen = sizeof(from); |
3c0ef626 | 779 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 780 | if (getpeername(packet_get_connection_in(), |
30460aeb | 781 | (struct sockaddr *)&from, &fromlen) < 0) { |
3c0ef626 | 782 | debug("getpeername: %.100s", strerror(errno)); |
540d72c3 | 783 | cleanup_exit(255); |
3c0ef626 | 784 | } |
785 | } | |
786 | ||
787 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
7cac2b65 | 788 | get_remote_name_or_ip(utmp_len, options.use_dns), |
bfe49944 | 789 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 790 | } |
791 | #endif | |
792 | ||
793 | /* | |
794 | * This is called to fork and execute a command. If another command is | |
795 | * to be forced, execute that instead. | |
796 | */ | |
5156b1a1 | 797 | int |
3c0ef626 | 798 | do_exec(Session *s, const char *command) |
799 | { | |
5156b1a1 | 800 | int ret; |
801 | ||
30460aeb | 802 | if (options.adm_forced_command) { |
803 | original_command = command; | |
804 | command = options.adm_forced_command; | |
e74dc197 | 805 | if (strcmp(INTERNAL_SFTP_NAME, command) == 0) |
806 | s->is_subsystem = SUBSYSTEM_INT_SFTP; | |
807 | else if (s->is_subsystem) | |
808 | s->is_subsystem = SUBSYSTEM_EXT; | |
30460aeb | 809 | debug("Forced command (config) '%.900s'", command); |
810 | } else if (forced_command) { | |
3c0ef626 | 811 | original_command = command; |
812 | command = forced_command; | |
e74dc197 | 813 | if (strcmp(INTERNAL_SFTP_NAME, command) == 0) |
814 | s->is_subsystem = SUBSYSTEM_INT_SFTP; | |
815 | else if (s->is_subsystem) | |
816 | s->is_subsystem = SUBSYSTEM_EXT; | |
30460aeb | 817 | debug("Forced command (key option) '%.900s'", command); |
3c0ef626 | 818 | } |
819 | ||
7cac2b65 | 820 | #if defined(SESSION_HOOKS) |
821 | if (options.session_hooks_allow && | |
822 | (options.session_hooks_startup_cmd || | |
823 | options.session_hooks_shutdown_cmd)) | |
824 | { | |
825 | char env_file[1000]; | |
826 | struct stat st; | |
827 | do | |
828 | { | |
829 | snprintf(env_file, | |
830 | sizeof(env_file), | |
831 | "/tmp/ssh_env_%d%d%d", | |
832 | getuid(), | |
833 | getpid(), | |
834 | rand()); | |
835 | } while (stat(env_file, &st)==0); | |
836 | s->authctxt->session_env_file = strdup(env_file); | |
837 | } | |
838 | #endif | |
839 | ||
dfddba3d | 840 | #ifdef SSH_AUDIT_EVENTS |
841 | if (command != NULL) | |
842 | PRIVSEP(audit_run_command(command)); | |
843 | else if (s->ttyfd == -1) { | |
844 | char *shell = s->pw->pw_shell; | |
845 | ||
846 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
847 | shell =_PATH_BSHELL; | |
848 | PRIVSEP(audit_run_command(shell)); | |
849 | } | |
850 | #endif | |
3c0ef626 | 851 | if (s->ttyfd != -1) |
5156b1a1 | 852 | ret = do_exec_pty(s, command); |
3c0ef626 | 853 | else |
5156b1a1 | 854 | ret = do_exec_no_pty(s, command); |
3c0ef626 | 855 | |
856 | original_command = NULL; | |
3c0ef626 | 857 | |
7e82606e | 858 | /* |
859 | * Clear loginmsg: it's the child's responsibility to display | |
860 | * it to the user, otherwise multiple sessions may accumulate | |
861 | * multiple copies of the login messages. | |
862 | */ | |
863 | buffer_clear(&loginmsg); | |
5156b1a1 | 864 | |
865 | return ret; | |
7e82606e | 866 | } |
e9702f7d | 867 | |
3c0ef626 | 868 | /* administrative, login(1)-like work */ |
869 | void | |
870 | do_login(Session *s, const char *command) | |
871 | { | |
3c0ef626 | 872 | socklen_t fromlen; |
873 | struct sockaddr_storage from; | |
3c0ef626 | 874 | struct passwd * pw = s->pw; |
875 | pid_t pid = getpid(); | |
876 | ||
877 | /* | |
878 | * Get IP address of client. If the connection is not a socket, let | |
879 | * the address be 0.0.0.0. | |
880 | */ | |
881 | memset(&from, 0, sizeof(from)); | |
bfe49944 | 882 | fromlen = sizeof(from); |
3c0ef626 | 883 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 884 | if (getpeername(packet_get_connection_in(), |
e9702f7d | 885 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 886 | debug("getpeername: %.100s", strerror(errno)); |
540d72c3 | 887 | cleanup_exit(255); |
3c0ef626 | 888 | } |
889 | } | |
890 | ||
3c0ef626 | 891 | /* Record that there was a login on that tty from the remote host. */ |
350391c5 | 892 | if (!use_privsep) |
893 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
894 | get_remote_name_or_ip(utmp_len, | |
7cac2b65 | 895 | options.use_dns), |
d03f4262 | 896 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 897 | |
898 | #ifdef USE_PAM | |
899 | /* | |
900 | * If password change is needed, do it now. | |
901 | * This needs to occur before the ~/.hushlogin check. | |
902 | */ | |
540d72c3 | 903 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
904 | display_loginmsg(); | |
3c0ef626 | 905 | do_pam_chauthtok(); |
540d72c3 | 906 | s->authctxt->force_pwchange = 0; |
7cac2b65 | 907 | /* XXX - signal [net] parent to enable forwardings */ |
3c0ef626 | 908 | } |
909 | #endif | |
910 | ||
911 | if (check_quietlogin(s, command)) | |
912 | return; | |
913 | ||
540d72c3 | 914 | display_loginmsg(); |
3c0ef626 | 915 | |
3c0ef626 | 916 | do_motd(); |
917 | } | |
918 | ||
919 | /* | |
920 | * Display the message of the day. | |
921 | */ | |
922 | void | |
923 | do_motd(void) | |
924 | { | |
925 | FILE *f; | |
926 | char buf[256]; | |
927 | ||
928 | if (options.print_motd) { | |
929 | #ifdef HAVE_LOGIN_CAP | |
930 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
931 | "/etc/motd"), "r"); | |
932 | #else | |
933 | f = fopen("/etc/motd", "r"); | |
934 | #endif | |
935 | if (f) { | |
936 | while (fgets(buf, sizeof(buf), f)) | |
937 | fputs(buf, stdout); | |
938 | fclose(f); | |
939 | } | |
940 | } | |
941 | } | |
942 | ||
943 | ||
944 | /* | |
945 | * Check for quiet login, either .hushlogin or command given. | |
946 | */ | |
947 | int | |
948 | check_quietlogin(Session *s, const char *command) | |
949 | { | |
950 | char buf[256]; | |
951 | struct passwd *pw = s->pw; | |
952 | struct stat st; | |
953 | ||
954 | /* Return 1 if .hushlogin exists or a command given. */ | |
955 | if (command != NULL) | |
956 | return 1; | |
957 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
958 | #ifdef HAVE_LOGIN_CAP | |
959 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
960 | return 1; | |
961 | #else | |
962 | if (stat(buf, &st) >= 0) | |
963 | return 1; | |
964 | #endif | |
965 | return 0; | |
966 | } | |
967 | ||
968 | /* | |
969 | * Sets the value of the given variable in the environment. If the variable | |
970 | * already exists, its value is overriden. | |
971 | */ | |
5598e598 | 972 | void |
3c0ef626 | 973 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
e9702f7d | 974 | const char *value) |
3c0ef626 | 975 | { |
3c0ef626 | 976 | char **env; |
29d88157 | 977 | u_int envsize; |
978 | u_int i, namelen; | |
3c0ef626 | 979 | |
7cac2b65 | 980 | /* |
981 | * If we're passed an uninitialized list, allocate a single null | |
982 | * entry before continuing. | |
983 | */ | |
984 | if (*envp == NULL && *envsizep == 0) { | |
985 | *envp = xmalloc(sizeof(char *)); | |
986 | *envp[0] = NULL; | |
987 | *envsizep = 1; | |
988 | } | |
989 | ||
3c0ef626 | 990 | /* |
991 | * Find the slot where the value should be stored. If the variable | |
992 | * already exists, we reuse the slot; otherwise we append a new slot | |
993 | * at the end of the array, expanding if necessary. | |
994 | */ | |
995 | env = *envp; | |
996 | namelen = strlen(name); | |
997 | for (i = 0; env[i]; i++) | |
998 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
999 | break; | |
1000 | if (env[i]) { | |
1001 | /* Reuse the slot. */ | |
1002 | xfree(env[i]); | |
1003 | } else { | |
1004 | /* New variable. Expand if necessary. */ | |
29d88157 | 1005 | envsize = *envsizep; |
1006 | if (i >= envsize - 1) { | |
1007 | if (envsize >= 1000) | |
1008 | fatal("child_set_env: too many env vars"); | |
1009 | envsize += 50; | |
30460aeb | 1010 | env = (*envp) = xrealloc(env, envsize, sizeof(char *)); |
29d88157 | 1011 | *envsizep = envsize; |
3c0ef626 | 1012 | } |
1013 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
1014 | env[i + 1] = NULL; | |
1015 | } | |
1016 | ||
1017 | /* Allocate space and format the variable in the appropriate slot. */ | |
1018 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
1019 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * Reads environment variables from the given file and adds/overrides them | |
1024 | * into the environment. If the file does not exist, this does nothing. | |
1025 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
1026 | * and assignments of the form name=value. No other forms are allowed. | |
1027 | */ | |
1028 | static void | |
1029 | read_environment_file(char ***env, u_int *envsize, | |
e9702f7d | 1030 | const char *filename) |
3c0ef626 | 1031 | { |
1032 | FILE *f; | |
1033 | char buf[4096]; | |
1034 | char *cp, *value; | |
276b07a3 | 1035 | u_int lineno = 0; |
3c0ef626 | 1036 | |
1037 | f = fopen(filename, "r"); | |
1038 | if (!f) | |
1039 | return; | |
1040 | ||
1041 | while (fgets(buf, sizeof(buf), f)) { | |
276b07a3 | 1042 | if (++lineno > 1000) |
1043 | fatal("Too many lines in environment file %s", filename); | |
3c0ef626 | 1044 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
1045 | ; | |
1046 | if (!*cp || *cp == '#' || *cp == '\n') | |
1047 | continue; | |
e74dc197 | 1048 | |
1049 | cp[strcspn(cp, "\n")] = '\0'; | |
1050 | ||
3c0ef626 | 1051 | value = strchr(cp, '='); |
1052 | if (value == NULL) { | |
276b07a3 | 1053 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
1054 | filename); | |
3c0ef626 | 1055 | continue; |
1056 | } | |
1057 | /* | |
1058 | * Replace the equals sign by nul, and advance value to | |
1059 | * the value string. | |
1060 | */ | |
1061 | *value = '\0'; | |
1062 | value++; | |
1063 | child_set_env(env, envsize, cp, value); | |
1064 | } | |
1065 | fclose(f); | |
1066 | } | |
1067 | ||
75be3237 | 1068 | #ifdef SESSION_HOOKS |
1069 | #define SSH_SESSION_ENV_FILE "SSH_SESSION_ENV_FILE" | |
1070 | ||
1071 | typedef enum { no_op, execute, clear_env, restore_env, | |
1072 | read_env, save_or_rm_env } session_action_t; | |
1073 | ||
1074 | static session_action_t action_order[2][5] = { | |
1075 | { clear_env, read_env, execute, save_or_rm_env, restore_env }, /*shutdown*/ | |
1076 | { execute, read_env, save_or_rm_env, no_op, no_op } /*startup */ | |
1077 | }; | |
1078 | ||
1079 | static | |
1080 | void execute_session_hook(char* prog, Authctxt *authctxt, | |
1081 | int startup, int save) | |
1082 | { | |
1083 | extern char **environ; | |
1084 | ||
1085 | struct stat st; | |
1086 | char **saved_env, **tmpenv; | |
1087 | char *env_file = authctxt->session_env_file; | |
1088 | int i, status = 0; | |
1089 | ||
1090 | for (i=0; i<5; i++) | |
1091 | { | |
1092 | switch (action_order[startup][i]) | |
1093 | { | |
1094 | case no_op: | |
1095 | break; | |
1096 | ||
1097 | case execute: | |
1098 | { | |
1099 | FILE* fp; | |
1100 | char buf[1000]; | |
1101 | ||
1102 | snprintf(buf, | |
1103 | sizeof(buf), | |
1104 | "%s -c '%s'", | |
1105 | authctxt->pw->pw_shell, | |
1106 | prog); | |
1107 | ||
1108 | debug("executing session hook: [%s]", buf); | |
1109 | setenv(SSH_SESSION_ENV_FILE, env_file, /* overwrite = */ 1); | |
1110 | ||
1111 | /* flusing is recommended in the popen(3) man page, to avoid | |
1112 | intermingling of output */ | |
1113 | fflush(stdout); | |
1114 | fflush(stderr); | |
1115 | if ((fp=popen(buf, "w")) == NULL) | |
1116 | { | |
1117 | perror("Unable to run session hook"); | |
1118 | return; | |
1119 | } | |
1120 | status = pclose(fp); | |
1121 | debug2("session hook executed, status=%d", status); | |
1122 | unsetenv(SSH_SESSION_ENV_FILE); | |
1123 | } | |
1124 | break; | |
1125 | ||
1126 | case clear_env: | |
1127 | saved_env = environ; | |
1128 | tmpenv = (char**) malloc(sizeof(char*)); | |
1129 | tmpenv[0] = NULL; | |
1130 | environ = tmpenv; | |
1131 | break; | |
1132 | ||
1133 | case restore_env: | |
1134 | environ = saved_env; | |
1135 | free(tmpenv); | |
1136 | break; | |
1137 | ||
1138 | case read_env: | |
1139 | if (status==0 && stat(env_file, &st)==0) | |
1140 | { | |
1141 | int envsize = 0; | |
1142 | ||
1143 | debug("reading environment from %s", env_file); | |
1144 | while (environ[envsize++]) ; | |
1145 | read_environment_file(&environ, &envsize, env_file); | |
1146 | } | |
1147 | break; | |
1148 | ||
1149 | case save_or_rm_env: | |
1150 | if (status==0 && save) | |
1151 | { | |
1152 | FILE* fp; | |
1153 | int envcount=0; | |
1154 | ||
1155 | debug2("saving environment to %s", env_file); | |
1156 | if ((fp = fopen(env_file, "w")) == NULL) /* hmm: file perms? */ | |
1157 | { | |
1158 | perror("Unable to save session hook info"); | |
1159 | } | |
1160 | while (environ[envcount]) | |
1161 | { | |
1162 | fprintf(fp, "%s\n", environ[envcount++]); | |
1163 | } | |
1164 | fflush(fp); | |
1165 | fclose(fp); | |
1166 | } | |
1167 | else if (stat(env_file, &st)==0) | |
1168 | { | |
1169 | debug2("removing environment file %s", env_file); | |
1170 | remove(env_file); | |
1171 | } | |
1172 | break; | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | } | |
1177 | #endif | |
1178 | ||
7cac2b65 | 1179 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
1180 | /* | |
1181 | * Return named variable from specified environment, or NULL if not present. | |
1182 | */ | |
1183 | static char * | |
1184 | child_get_env(char **env, const char *name) | |
1185 | { | |
1186 | int i; | |
1187 | size_t len; | |
1188 | ||
1189 | len = strlen(name); | |
1190 | for (i=0; env[i] != NULL; i++) | |
1191 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
1192 | return(env[i] + len + 1); | |
1193 | return NULL; | |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * Read /etc/default/login. | |
1198 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
1199 | */ | |
1200 | static void | |
1201 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
1202 | { | |
1203 | char **tmpenv = NULL, *var; | |
29d88157 | 1204 | u_int i, tmpenvsize = 0; |
540d72c3 | 1205 | u_long mask; |
7cac2b65 | 1206 | |
1207 | /* | |
1208 | * We don't want to copy the whole file to the child's environment, | |
1209 | * so we use a temporary environment and copy the variables we're | |
1210 | * interested in. | |
1211 | */ | |
1212 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
1213 | ||
29d88157 | 1214 | if (tmpenv == NULL) |
1215 | return; | |
1216 | ||
7cac2b65 | 1217 | if (uid == 0) |
1218 | var = child_get_env(tmpenv, "SUPATH"); | |
1219 | else | |
1220 | var = child_get_env(tmpenv, "PATH"); | |
1221 | if (var != NULL) | |
1222 | child_set_env(env, envsize, "PATH", var); | |
540d72c3 | 1223 | |
7cac2b65 | 1224 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
1225 | if (sscanf(var, "%5lo", &mask) == 1) | |
540d72c3 | 1226 | umask((mode_t)mask); |
1227 | ||
7cac2b65 | 1228 | for (i = 0; tmpenv[i] != NULL; i++) |
1229 | xfree(tmpenv[i]); | |
1230 | xfree(tmpenv); | |
1231 | } | |
1232 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1233 | ||
2ce0bfe4 | 1234 | void |
1235 | copy_environment(char **source, char ***env, u_int *envsize) | |
3c0ef626 | 1236 | { |
e9702f7d | 1237 | char *var_name, *var_val; |
3c0ef626 | 1238 | int i; |
1239 | ||
e9702f7d | 1240 | if (source == NULL) |
3c0ef626 | 1241 | return; |
1242 | ||
e9702f7d | 1243 | for(i = 0; source[i] != NULL; i++) { |
1244 | var_name = xstrdup(source[i]); | |
1245 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
1246 | xfree(var_name); | |
3c0ef626 | 1247 | continue; |
3c0ef626 | 1248 | } |
e9702f7d | 1249 | *var_val++ = '\0'; |
3c0ef626 | 1250 | |
e9702f7d | 1251 | debug3("Copy environment: %s=%s", var_name, var_val); |
1252 | child_set_env(env, envsize, var_name, var_val); | |
540d72c3 | 1253 | |
e9702f7d | 1254 | xfree(var_name); |
3c0ef626 | 1255 | } |
3c0ef626 | 1256 | } |
1257 | ||
e9702f7d | 1258 | static char ** |
1259 | do_setup_env(Session *s, const char *shell) | |
3c0ef626 | 1260 | { |
3c0ef626 | 1261 | char buf[256]; |
e9702f7d | 1262 | u_int i, envsize; |
30460aeb | 1263 | char **env, *laddr; |
e9702f7d | 1264 | struct passwd *pw = s->pw; |
30460aeb | 1265 | #ifndef HAVE_LOGIN_CAP |
1266 | char *path = NULL; | |
1267 | #endif | |
3c0ef626 | 1268 | |
1269 | /* Initialize the environment. */ | |
1270 | envsize = 100; | |
30460aeb | 1271 | env = xcalloc(envsize, sizeof(char *)); |
3c0ef626 | 1272 | env[0] = NULL; |
1273 | ||
1274 | #ifdef HAVE_CYGWIN | |
1275 | /* | |
1276 | * The Windows environment contains some setting which are | |
1277 | * important for a running system. They must not be dropped. | |
1278 | */ | |
dfddba3d | 1279 | { |
1280 | char **p; | |
1281 | ||
1282 | p = fetch_windows_environment(); | |
1283 | copy_environment(p, &env, &envsize); | |
1284 | free_windows_environment(p); | |
1285 | } | |
3c0ef626 | 1286 | #endif |
1287 | ||
5598e598 | 1288 | #ifdef GSSAPI |
540d72c3 | 1289 | /* Allow any GSSAPI methods that we've used to alter |
5598e598 | 1290 | * the childs environment as they see fit |
1291 | */ | |
7cac2b65 | 1292 | ssh_gssapi_do_child(&env, &envsize); |
5598e598 | 1293 | #endif |
1294 | ||
3c0ef626 | 1295 | if (!options.use_login) { |
1296 | /* Set basic environment. */ | |
7e82606e | 1297 | for (i = 0; i < s->num_env; i++) |
1298 | child_set_env(&env, &envsize, s->env[i].name, | |
1299 | s->env[i].val); | |
1300 | ||
3c0ef626 | 1301 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1302 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
bfe49944 | 1303 | #ifdef _AIX |
1304 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1305 | #endif | |
3c0ef626 | 1306 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
1307 | #ifdef HAVE_LOGIN_CAP | |
d03f4262 | 1308 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1309 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1310 | else | |
1311 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
3c0ef626 | 1312 | #else /* HAVE_LOGIN_CAP */ |
1313 | # ifndef HAVE_CYGWIN | |
1314 | /* | |
1315 | * There's no standard path on Windows. The path contains | |
1316 | * important components pointing to the system directories, | |
1317 | * needed for loading shared libraries. So the path better | |
1318 | * remains intact here. | |
1319 | */ | |
7cac2b65 | 1320 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1321 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1322 | path = child_get_env(env, "PATH"); | |
1323 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1324 | if (path == NULL || *path == '\0') { | |
540d72c3 | 1325 | child_set_env(&env, &envsize, "PATH", |
7cac2b65 | 1326 | s->pw->pw_uid == 0 ? |
1327 | SUPERUSER_PATH : _PATH_STDPATH); | |
1328 | } | |
3c0ef626 | 1329 | # endif /* HAVE_CYGWIN */ |
1330 | #endif /* HAVE_LOGIN_CAP */ | |
1331 | ||
1332 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1333 | _PATH_MAILDIR, pw->pw_name); | |
1334 | child_set_env(&env, &envsize, "MAIL", buf); | |
1335 | ||
1336 | /* Normal systems set SHELL by default. */ | |
1337 | child_set_env(&env, &envsize, "SHELL", shell); | |
1338 | } | |
1339 | if (getenv("TZ")) | |
1340 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1341 | ||
1752c22a | 1342 | #ifdef GSI /* GSI shared libs typically installed in non-system locations. */ |
1343 | { | |
1344 | char *cp; | |
1345 | ||
1346 | if ((cp = getenv("LD_LIBRARY_PATH")) != NULL) | |
1347 | child_set_env(&env, &envsize, "LD_LIBRARY_PATH", cp); | |
1348 | if ((cp = getenv("LIBPATH")) != NULL) | |
1349 | child_set_env(&env, &envsize, "LIBPATH", cp); | |
1350 | if ((cp = getenv("SHLIB_PATH")) != NULL) | |
1351 | child_set_env(&env, &envsize, "SHLIB_PATH", cp); | |
1352 | if ((cp = getenv("LD_LIBRARYN32_PATH")) != NULL) | |
1353 | child_set_env(&env, &envsize, "LD_LIBRARYN32_PATH",cp); | |
1354 | if ((cp = getenv("LD_LIBRARY64_PATH")) != NULL) | |
1355 | child_set_env(&env, &envsize, "LD_LIBRARY64_PATH",cp); | |
1356 | } | |
1357 | #endif | |
1358 | ||
3c0ef626 | 1359 | /* Set custom environment options from RSA authentication. */ |
1360 | if (!options.use_login) { | |
1361 | while (custom_environment) { | |
1362 | struct envstring *ce = custom_environment; | |
d03f4262 | 1363 | char *str = ce->s; |
e9702f7d | 1364 | |
d03f4262 | 1365 | for (i = 0; str[i] != '=' && str[i]; i++) |
3c0ef626 | 1366 | ; |
d03f4262 | 1367 | if (str[i] == '=') { |
1368 | str[i] = 0; | |
1369 | child_set_env(&env, &envsize, str, str + i + 1); | |
3c0ef626 | 1370 | } |
1371 | custom_environment = ce->next; | |
1372 | xfree(ce->s); | |
1373 | xfree(ce); | |
1374 | } | |
1375 | } | |
1376 | ||
d03f4262 | 1377 | /* SSH_CLIENT deprecated */ |
3c0ef626 | 1378 | snprintf(buf, sizeof buf, "%.50s %d %d", |
e9702f7d | 1379 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
3c0ef626 | 1380 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1381 | ||
bfe49944 | 1382 | laddr = get_local_ipaddr(packet_get_connection_in()); |
d03f4262 | 1383 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
bfe49944 | 1384 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1385 | xfree(laddr); | |
d03f4262 | 1386 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1387 | ||
3c0ef626 | 1388 | if (s->ttyfd != -1) |
1389 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1390 | if (s->term) | |
1391 | child_set_env(&env, &envsize, "TERM", s->term); | |
1392 | if (s->display) | |
1393 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
1394 | if (original_command) | |
1395 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1396 | original_command); | |
1397 | ||
d03f4262 | 1398 | #ifdef _UNICOS |
1399 | if (cray_tmpdir[0] != '\0') | |
1400 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1401 | #endif /* _UNICOS */ | |
1402 | ||
dfddba3d | 1403 | /* |
1404 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1405 | * must have been set by a native authentication method (eg AIX or | |
1406 | * SIA), so copy it to the child. | |
1407 | */ | |
1408 | { | |
1409 | char *cp; | |
1410 | ||
1411 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1412 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1413 | } | |
1414 | ||
3c0ef626 | 1415 | #ifdef _AIX |
e9702f7d | 1416 | { |
1417 | char *cp; | |
1418 | ||
1419 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1420 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
e9702f7d | 1421 | read_environment_file(&env, &envsize, "/etc/environment"); |
1422 | } | |
3c0ef626 | 1423 | #endif |
3c0ef626 | 1424 | #ifdef KRB5 |
12a403af | 1425 | if (s->authctxt->krb5_ccname) |
3c0ef626 | 1426 | child_set_env(&env, &envsize, "KRB5CCNAME", |
12a403af | 1427 | s->authctxt->krb5_ccname); |
3c0ef626 | 1428 | #endif |
1429 | #ifdef USE_PAM | |
d03f4262 | 1430 | /* |
1431 | * Pull in any environment variables that may have | |
1432 | * been set by PAM. | |
1433 | */ | |
7cac2b65 | 1434 | if (options.use_pam) { |
540d72c3 | 1435 | char **p; |
d03f4262 | 1436 | |
540d72c3 | 1437 | p = fetch_pam_child_environment(); |
1438 | copy_environment(p, &env, &envsize); | |
1439 | free_pam_environment(p); | |
1440 | ||
1441 | p = fetch_pam_environment(); | |
d03f4262 | 1442 | copy_environment(p, &env, &envsize); |
1443 | free_pam_environment(p); | |
1444 | } | |
3c0ef626 | 1445 | #endif /* USE_PAM */ |
1446 | ||
44a053a3 | 1447 | if (auth_sock_name != NULL) |
3c0ef626 | 1448 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
44a053a3 | 1449 | auth_sock_name); |
3c0ef626 | 1450 | |
1451 | /* read $HOME/.ssh/environment. */ | |
d03f4262 | 1452 | if (options.permit_user_env && !options.use_login) { |
3c0ef626 | 1453 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
d03f4262 | 1454 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
3c0ef626 | 1455 | read_environment_file(&env, &envsize, buf); |
1456 | } | |
1457 | if (debug_flag) { | |
1458 | /* dump the environment */ | |
1459 | fprintf(stderr, "Environment:\n"); | |
1460 | for (i = 0; env[i]; i++) | |
1461 | fprintf(stderr, " %.200s\n", env[i]); | |
1462 | } | |
e9702f7d | 1463 | return env; |
1464 | } | |
1465 | ||
1466 | /* | |
1467 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1468 | * first in this order). | |
1469 | */ | |
1470 | static void | |
1471 | do_rc_files(Session *s, const char *shell) | |
1472 | { | |
1473 | FILE *f = NULL; | |
1474 | char cmd[1024]; | |
1475 | int do_xauth; | |
1476 | struct stat st; | |
1477 | ||
1478 | do_xauth = | |
1479 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1480 | ||
e74dc197 | 1481 | /* ignore _PATH_SSH_USER_RC for subsystems and admin forced commands */ |
1482 | if (!s->is_subsystem && options.adm_forced_command == NULL && | |
5156b1a1 | 1483 | !no_user_rc && stat(_PATH_SSH_USER_RC, &st) >= 0) { |
e9702f7d | 1484 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", |
1485 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1486 | if (debug_flag) | |
1487 | fprintf(stderr, "Running %s\n", cmd); | |
1488 | f = popen(cmd, "w"); | |
1489 | if (f) { | |
1490 | if (do_xauth) | |
1491 | fprintf(f, "%s %s\n", s->auth_proto, | |
1492 | s->auth_data); | |
1493 | pclose(f); | |
1494 | } else | |
1495 | fprintf(stderr, "Could not run %s\n", | |
1496 | _PATH_SSH_USER_RC); | |
1497 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1498 | if (debug_flag) | |
1499 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1500 | _PATH_SSH_SYSTEM_RC); | |
1501 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1502 | if (f) { | |
1503 | if (do_xauth) | |
1504 | fprintf(f, "%s %s\n", s->auth_proto, | |
1505 | s->auth_data); | |
1506 | pclose(f); | |
1507 | } else | |
1508 | fprintf(stderr, "Could not run %s\n", | |
1509 | _PATH_SSH_SYSTEM_RC); | |
1510 | } else if (do_xauth && options.xauth_location != NULL) { | |
1511 | /* Add authority data to .Xauthority if appropriate. */ | |
1512 | if (debug_flag) { | |
1513 | fprintf(stderr, | |
bfe49944 | 1514 | "Running %.500s remove %.100s\n", |
540d72c3 | 1515 | options.xauth_location, s->auth_display); |
bfe49944 | 1516 | fprintf(stderr, |
1517 | "%.500s add %.100s %.100s %.100s\n", | |
e9702f7d | 1518 | options.xauth_location, s->auth_display, |
1519 | s->auth_proto, s->auth_data); | |
1520 | } | |
1521 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1522 | options.xauth_location); | |
1523 | f = popen(cmd, "w"); | |
1524 | if (f) { | |
bfe49944 | 1525 | fprintf(f, "remove %s\n", |
1526 | s->auth_display); | |
e9702f7d | 1527 | fprintf(f, "add %s %s %s\n", |
1528 | s->auth_display, s->auth_proto, | |
1529 | s->auth_data); | |
1530 | pclose(f); | |
1531 | } else { | |
1532 | fprintf(stderr, "Could not run %s\n", | |
1533 | cmd); | |
1534 | } | |
1535 | } | |
1536 | } | |
1537 | ||
1538 | static void | |
1539 | do_nologin(struct passwd *pw) | |
1540 | { | |
1541 | FILE *f = NULL; | |
1542 | char buf[1024]; | |
1543 | ||
1544 | #ifdef HAVE_LOGIN_CAP | |
1545 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1546 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1547 | _PATH_NOLOGIN), "r"); | |
1548 | #else | |
1549 | if (pw->pw_uid) | |
1550 | f = fopen(_PATH_NOLOGIN, "r"); | |
1551 | #endif | |
1552 | if (f) { | |
1553 | /* /etc/nologin exists. Print its contents and exit. */ | |
7cac2b65 | 1554 | logit("User %.100s not allowed because %s exists", |
d03f4262 | 1555 | pw->pw_name, _PATH_NOLOGIN); |
e9702f7d | 1556 | while (fgets(buf, sizeof(buf), f)) |
1557 | fputs(buf, stderr); | |
1558 | fclose(f); | |
bfe49944 | 1559 | fflush(NULL); |
e9702f7d | 1560 | exit(254); |
1561 | } | |
1562 | } | |
1563 | ||
e74dc197 | 1564 | /* |
1565 | * Chroot into a directory after checking it for safety: all path components | |
1566 | * must be root-owned directories with strict permissions. | |
1567 | */ | |
1568 | static void | |
1569 | safely_chroot(const char *path, uid_t uid) | |
1570 | { | |
1571 | const char *cp; | |
1572 | char component[MAXPATHLEN]; | |
1573 | struct stat st; | |
1574 | ||
1575 | if (*path != '/') | |
1576 | fatal("chroot path does not begin at root"); | |
1577 | if (strlen(path) >= sizeof(component)) | |
1578 | fatal("chroot path too long"); | |
1579 | ||
1580 | /* | |
1581 | * Descend the path, checking that each component is a | |
1582 | * root-owned directory with strict permissions. | |
1583 | */ | |
1584 | for (cp = path; cp != NULL;) { | |
1585 | if ((cp = strchr(cp, '/')) == NULL) | |
1586 | strlcpy(component, path, sizeof(component)); | |
1587 | else { | |
1588 | cp++; | |
1589 | memcpy(component, path, cp - path); | |
1590 | component[cp - path] = '\0'; | |
1591 | } | |
1592 | ||
1593 | debug3("%s: checking '%s'", __func__, component); | |
1594 | ||
1595 | if (stat(component, &st) != 0) | |
1596 | fatal("%s: stat(\"%s\"): %s", __func__, | |
1597 | component, strerror(errno)); | |
1598 | if (st.st_uid != 0 || (st.st_mode & 022) != 0) | |
1599 | fatal("bad ownership or modes for chroot " | |
1600 | "directory %s\"%s\"", | |
1601 | cp == NULL ? "" : "component ", component); | |
1602 | if (!S_ISDIR(st.st_mode)) | |
1603 | fatal("chroot path %s\"%s\" is not a directory", | |
1604 | cp == NULL ? "" : "component ", component); | |
1605 | ||
1606 | } | |
1607 | ||
1608 | if (chdir(path) == -1) | |
1609 | fatal("Unable to chdir to chroot path \"%s\": " | |
1610 | "%s", path, strerror(errno)); | |
1611 | if (chroot(path) == -1) | |
1612 | fatal("chroot(\"%s\"): %s", path, strerror(errno)); | |
1613 | if (chdir("/") == -1) | |
1614 | fatal("%s: chdir(/) after chroot: %s", | |
1615 | __func__, strerror(errno)); | |
1616 | verbose("Changed root directory to \"%s\"", path); | |
1617 | } | |
1618 | ||
e9702f7d | 1619 | /* Set login name, uid, gid, and groups. */ |
350391c5 | 1620 | void |
e9702f7d | 1621 | do_setusercontext(struct passwd *pw) |
1622 | { | |
e74dc197 | 1623 | char *chroot_path, *tmp; |
1624 | ||
1625 | #ifdef WITH_SELINUX | |
1626 | /* Cache selinux status for later use */ | |
1627 | (void)ssh_selinux_enabled(); | |
1628 | #endif | |
1629 | ||
bfe49944 | 1630 | #ifndef HAVE_CYGWIN |
1631 | if (getuid() == 0 || geteuid() == 0) | |
e9702f7d | 1632 | #endif /* HAVE_CYGWIN */ |
bfe49944 | 1633 | { |
1634 | ||
44a053a3 | 1635 | #ifdef HAVE_SETPCRED |
7cac2b65 | 1636 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1637 | fatal("Failed to set process credentials"); | |
44a053a3 | 1638 | #endif /* HAVE_SETPCRED */ |
e9702f7d | 1639 | #ifdef HAVE_LOGIN_CAP |
d03f4262 | 1640 | # ifdef __bsdi__ |
276b07a3 | 1641 | setpgid(0, 0); |
d03f4262 | 1642 | # endif |
540d72c3 | 1643 | # ifdef USE_PAM |
1644 | if (options.use_pam) { | |
fa0f0f45 | 1645 | do_pam_setcred(use_privsep); |
540d72c3 | 1646 | } |
1647 | # endif /* USE_PAM */ | |
e9702f7d | 1648 | if (setusercontext(lc, pw, pw->pw_uid, |
e74dc197 | 1649 | (LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETUSER))) < 0) { |
e9702f7d | 1650 | perror("unable to set user context"); |
1651 | exit(1); | |
1652 | } | |
1653 | #else | |
1654 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1655 | /* Sets login uid for accounting */ | |
1656 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1657 | error("setluid: %s", strerror(errno)); | |
1658 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1659 | ||
1660 | if (setlogin(pw->pw_name) < 0) | |
1661 | error("setlogin failed: %s", strerror(errno)); | |
1662 | if (setgid(pw->pw_gid) < 0) { | |
1663 | perror("setgid"); | |
1664 | exit(1); | |
1665 | } | |
1666 | /* Initialize the group list. */ | |
1667 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1668 | perror("initgroups"); | |
1669 | exit(1); | |
1670 | } | |
1671 | endgrent(); | |
1672 | # ifdef USE_PAM | |
1673 | /* | |
540d72c3 | 1674 | * PAM credentials may take the form of supplementary groups. |
e9702f7d | 1675 | * These will have been wiped by the above initgroups() call. |
1676 | * Reestablish them here. | |
1677 | */ | |
7cac2b65 | 1678 | if (options.use_pam) { |
fa0f0f45 | 1679 | do_pam_setcred(use_privsep); |
7cac2b65 | 1680 | } |
e9702f7d | 1681 | # endif /* USE_PAM */ |
1682 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1683 | irix_setusercontext(pw); | |
e74dc197 | 1684 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ |
276b07a3 | 1685 | # ifdef _AIX |
d03f4262 | 1686 | aix_usrinfo(pw); |
276b07a3 | 1687 | # endif /* _AIX */ |
e74dc197 | 1688 | # ifdef USE_LIBIAF |
2ce0bfe4 | 1689 | if (set_id(pw->pw_name) != 0) { |
1690 | exit(1); | |
1691 | } | |
e74dc197 | 1692 | # endif /* USE_LIBIAF */ |
1693 | #endif | |
1694 | ||
1695 | if (options.chroot_directory != NULL && | |
1696 | strcasecmp(options.chroot_directory, "none") != 0) { | |
1697 | tmp = tilde_expand_filename(options.chroot_directory, | |
1698 | pw->pw_uid); | |
1699 | chroot_path = percent_expand(tmp, "h", pw->pw_dir, | |
1700 | "u", pw->pw_name, (char *)NULL); | |
1701 | safely_chroot(chroot_path, pw->pw_uid); | |
1702 | free(tmp); | |
1703 | free(chroot_path); | |
1704 | } | |
1705 | ||
1706 | #ifdef HAVE_LOGIN_CAP | |
1707 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETUSER) < 0) { | |
1708 | perror("unable to set user context (setuser)"); | |
1709 | exit(1); | |
1710 | } | |
1711 | #else | |
e9702f7d | 1712 | /* Permanently switch to the desired uid. */ |
1713 | permanently_set_uid(pw); | |
1714 | #endif | |
1715 | } | |
bfe49944 | 1716 | |
1717 | #ifdef HAVE_CYGWIN | |
1718 | if (is_winnt) | |
1719 | #endif | |
e9702f7d | 1720 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1721 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
30460aeb | 1722 | |
1723 | #ifdef WITH_SELINUX | |
1724 | ssh_selinux_setup_exec_context(pw->pw_name); | |
1725 | #endif | |
e9702f7d | 1726 | } |
1727 | ||
540d72c3 | 1728 | static void |
1729 | do_pwchange(Session *s) | |
1730 | { | |
7e82606e | 1731 | fflush(NULL); |
540d72c3 | 1732 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1733 | if (s->ttyfd != -1) { | |
7e82606e | 1734 | fprintf(stderr, |
540d72c3 | 1735 | "You must change your password now and login again!\n"); |
dfddba3d | 1736 | #ifdef PASSWD_NEEDS_USERNAME |
1737 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1738 | (char *)NULL); | |
1739 | #else | |
540d72c3 | 1740 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
dfddba3d | 1741 | #endif |
540d72c3 | 1742 | perror("passwd"); |
1743 | } else { | |
1744 | fprintf(stderr, | |
1745 | "Password change required but no TTY available.\n"); | |
1746 | } | |
1747 | exit(1); | |
1748 | } | |
1749 | ||
350391c5 | 1750 | static void |
1751 | launch_login(struct passwd *pw, const char *hostname) | |
1752 | { | |
1753 | /* Launch login(1). */ | |
1754 | ||
44a053a3 | 1755 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
350391c5 | 1756 | #ifdef xxxLOGIN_NEEDS_TERM |
44a053a3 | 1757 | (s->term ? s->term : "unknown"), |
350391c5 | 1758 | #endif /* LOGIN_NEEDS_TERM */ |
1759 | #ifdef LOGIN_NO_ENDOPT | |
1760 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1761 | #else | |
1762 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1763 | #endif | |
1764 | ||
1765 | /* Login couldn't be executed, die. */ | |
1766 | ||
1767 | perror("login"); | |
1768 | exit(1); | |
1769 | } | |
1770 | ||
540d72c3 | 1771 | static void |
1772 | child_close_fds(void) | |
1773 | { | |
1774 | int i; | |
1775 | ||
1776 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1777 | close(packet_get_connection_in()); | |
1778 | else { | |
1779 | close(packet_get_connection_in()); | |
1780 | close(packet_get_connection_out()); | |
1781 | } | |
1782 | /* | |
1783 | * Close all descriptors related to channels. They will still remain | |
1784 | * open in the parent. | |
1785 | */ | |
1786 | /* XXX better use close-on-exec? -markus */ | |
1787 | channel_close_all(); | |
1788 | ||
1789 | /* | |
1790 | * Close any extra file descriptors. Note that there may still be | |
1791 | * descriptors left by system functions. They will be closed later. | |
1792 | */ | |
1793 | endpwent(); | |
1794 | ||
1795 | /* | |
08822d99 | 1796 | * Close any extra open file descriptors so that we don't have them |
540d72c3 | 1797 | * hanging around in clients. Note that we want to do this after |
1798 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1799 | * descriptors open. | |
1800 | */ | |
1801 | for (i = 3; i < 64; i++) | |
1802 | close(i); | |
1803 | } | |
1804 | ||
e9702f7d | 1805 | /* |
1806 | * Performs common processing for the child, such as setting up the | |
1807 | * environment, closing extra file descriptors, setting the user and group | |
1808 | * ids, and executing the command or shell. | |
1809 | */ | |
e74dc197 | 1810 | #define ARGV_MAX 10 |
e9702f7d | 1811 | void |
1812 | do_child(Session *s, const char *command) | |
1813 | { | |
1814 | extern char **environ; | |
1815 | char **env; | |
e74dc197 | 1816 | char *argv[ARGV_MAX]; |
e9702f7d | 1817 | const char *shell, *shell0, *hostname = NULL; |
1818 | struct passwd *pw = s->pw; | |
5156b1a1 | 1819 | int r = 0; |
e9702f7d | 1820 | |
62eb343a | 1821 | #ifdef AFS_KRB5 |
1822 | /* Default place to look for aklog. */ | |
1823 | #ifdef AKLOG_PATH | |
1824 | #define KPROGDIR AKLOG_PATH | |
1825 | #else | |
1826 | #define KPROGDIR "/usr/bin/aklog" | |
1827 | #endif /* AKLOG_PATH */ | |
1828 | ||
1829 | struct stat st; | |
1830 | char *aklog_path; | |
1831 | #endif /* AFS_KRB5 */ | |
1832 | ||
e9702f7d | 1833 | /* remove hostkey from the child's memory */ |
1834 | destroy_sensitive_data(); | |
1835 | ||
540d72c3 | 1836 | /* Force a password change */ |
1837 | if (s->authctxt->force_pwchange) { | |
1838 | do_setusercontext(pw); | |
1839 | child_close_fds(); | |
1840 | do_pwchange(s); | |
1841 | exit(1); | |
1842 | } | |
1843 | ||
e9702f7d | 1844 | /* login(1) is only called if we execute the login shell */ |
1845 | if (options.use_login && command != NULL) | |
1846 | options.use_login = 0; | |
1847 | ||
d03f4262 | 1848 | #ifdef _UNICOS |
1849 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1850 | #endif /* _UNICOS */ | |
1851 | ||
e9702f7d | 1852 | /* |
1853 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1854 | * switch, so we let login(1) to this for us. | |
1855 | */ | |
1856 | if (!options.use_login) { | |
1857 | #ifdef HAVE_OSF_SIA | |
bfe49944 | 1858 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
e9702f7d | 1859 | if (!check_quietlogin(s, command)) |
1860 | do_motd(); | |
1861 | #else /* HAVE_OSF_SIA */ | |
08822d99 | 1862 | /* When PAM is enabled we rely on it to do the nologin check */ |
1863 | if (!options.use_pam) | |
1864 | do_nologin(pw); | |
e9702f7d | 1865 | do_setusercontext(pw); |
7e82606e | 1866 | /* |
1867 | * PAM session modules in do_setusercontext may have | |
1868 | * generated messages, so if this in an interactive | |
1869 | * login then display them too. | |
1870 | */ | |
dfddba3d | 1871 | if (!check_quietlogin(s, command)) |
7e82606e | 1872 | display_loginmsg(); |
e9702f7d | 1873 | #endif /* HAVE_OSF_SIA */ |
1874 | } | |
1875 | ||
dfddba3d | 1876 | #ifdef USE_PAM |
8b32eddc | 1877 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1878 | debug3("PAM session not opened, exiting"); | |
dfddba3d | 1879 | display_loginmsg(); |
1880 | exit(254); | |
1881 | } | |
1882 | #endif | |
1883 | ||
e9702f7d | 1884 | /* |
1885 | * Get the shell from the password data. An empty shell field is | |
1886 | * legal, and means /bin/sh. | |
1887 | */ | |
1888 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
bfe49944 | 1889 | |
1890 | /* | |
1891 | * Make sure $SHELL points to the shell from the password file, | |
1892 | * even if shell is overridden from login.conf | |
1893 | */ | |
1894 | env = do_setup_env(s, shell); | |
1895 | ||
e9702f7d | 1896 | #ifdef HAVE_LOGIN_CAP |
1897 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1898 | #endif | |
1899 | ||
3c0ef626 | 1900 | /* we have to stash the hostname before we close our socket. */ |
1901 | if (options.use_login) | |
1902 | hostname = get_remote_name_or_ip(utmp_len, | |
7cac2b65 | 1903 | options.use_dns); |
3c0ef626 | 1904 | /* |
1905 | * Close the connection descriptors; note that this is the child, and | |
1906 | * the server will still have the socket open, and it is important | |
1907 | * that we do not shutdown it. Note that the descriptors cannot be | |
1908 | * closed before building the environment, as we call | |
1909 | * get_remote_ipaddr there. | |
1910 | */ | |
540d72c3 | 1911 | child_close_fds(); |
3c0ef626 | 1912 | |
1913 | /* | |
540d72c3 | 1914 | * Must take new environment into use so that .ssh/rc, |
1915 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
3c0ef626 | 1916 | */ |
540d72c3 | 1917 | environ = env; |
3c0ef626 | 1918 | |
540d72c3 | 1919 | #if defined(KRB5) && defined(USE_AFS) |
3c0ef626 | 1920 | /* |
540d72c3 | 1921 | * At this point, we check to see if AFS is active and if we have |
1922 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1923 | * if we can (and need to) extend the ticket into an AFS token. If | |
1924 | * we don't do this, we run into potential problems if the user's | |
1925 | * home directory is in AFS and it's not world-readable. | |
3c0ef626 | 1926 | */ |
3c0ef626 | 1927 | |
540d72c3 | 1928 | if (options.kerberos_get_afs_token && k_hasafs() && |
2ce0bfe4 | 1929 | (s->authctxt->krb5_ctx != NULL)) { |
540d72c3 | 1930 | char cell[64]; |
1931 | ||
1932 | debug("Getting AFS token"); | |
1933 | ||
1934 | k_setpag(); | |
1935 | ||
1936 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1937 | krb5_afslog(s->authctxt->krb5_ctx, | |
1938 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1939 | ||
1940 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1941 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1942 | } | |
1943 | #endif | |
3c0ef626 | 1944 | |
62eb343a | 1945 | #ifdef AFS_KRB5 |
1946 | ||
1947 | /* User has authenticated, and if a ticket was going to be | |
1948 | * passed we would have it. KRB5CCNAME should already be set. | |
1949 | * Now try to get an AFS token using aklog. | |
1950 | */ | |
1951 | if (k_hasafs()) { /* Do we have AFS? */ | |
1952 | ||
1953 | aklog_path = xstrdup(KPROGDIR); | |
1954 | ||
1955 | /* | |
1956 | * Make sure it exists before we try to run it | |
1957 | */ | |
1958 | if (stat(aklog_path, &st) == 0) { | |
1959 | debug("Running %s to get afs token.",aklog_path); | |
1960 | system(aklog_path); | |
1961 | } else { | |
1962 | debug("%s does not exist.",aklog_path); | |
1963 | } | |
1964 | ||
1965 | xfree(aklog_path); | |
1966 | } | |
1967 | #endif /* AFS_KRB5 */ | |
1968 | ||
75be3237 | 1969 | #ifdef SESSION_HOOKS |
1970 | if (options.session_hooks_allow && | |
1971 | options.session_hooks_startup_cmd) | |
1972 | { | |
1973 | execute_session_hook(options.session_hooks_startup_cmd, | |
1974 | s->authctxt, | |
1975 | /* startup = */ 1, | |
1976 | options.session_hooks_shutdown_cmd != NULL); | |
1977 | } | |
1978 | #endif | |
3c0ef626 | 1979 | |
08822d99 | 1980 | /* Change current directory to the user's home directory. */ |
3c0ef626 | 1981 | if (chdir(pw->pw_dir) < 0) { |
5156b1a1 | 1982 | /* Suppress missing homedir warning for chroot case */ |
3c0ef626 | 1983 | #ifdef HAVE_LOGIN_CAP |
5156b1a1 | 1984 | r = login_getcapbool(lc, "requirehome", 0); |
3c0ef626 | 1985 | #endif |
5156b1a1 | 1986 | if (r || options.chroot_directory == NULL) |
1987 | fprintf(stderr, "Could not chdir to home " | |
1988 | "directory %s: %s\n", pw->pw_dir, | |
1989 | strerror(errno)); | |
1990 | if (r) | |
1991 | exit(1); | |
3c0ef626 | 1992 | } |
1993 | ||
e74dc197 | 1994 | closefrom(STDERR_FILENO + 1); |
1995 | ||
e9702f7d | 1996 | if (!options.use_login) |
1997 | do_rc_files(s, shell); | |
3c0ef626 | 1998 | |
1999 | /* restore SIGPIPE for child */ | |
30460aeb | 2000 | signal(SIGPIPE, SIG_DFL); |
3c0ef626 | 2001 | |
e74dc197 | 2002 | if (s->is_subsystem == SUBSYSTEM_INT_SFTP) { |
2003 | extern int optind, optreset; | |
2004 | int i; | |
2005 | char *p, *args; | |
2006 | ||
2007 | setproctitle("%s@internal-sftp-server", s->pw->pw_name); | |
2008 | args = strdup(command ? command : "sftp-server"); | |
2009 | for (i = 0, (p = strtok(args, " ")); p; (p = strtok(NULL, " "))) | |
2010 | if (i < ARGV_MAX - 1) | |
2011 | argv[i++] = p; | |
2012 | argv[i] = NULL; | |
2013 | optind = optreset = 1; | |
2014 | __progname = argv[0]; | |
2015 | exit(sftp_server_main(i, argv, s->pw)); | |
2016 | } | |
2017 | ||
e9702f7d | 2018 | if (options.use_login) { |
350391c5 | 2019 | launch_login(pw, hostname); |
2020 | /* NEVERREACHED */ | |
e9702f7d | 2021 | } |
2022 | ||
2023 | /* Get the last component of the shell name. */ | |
2024 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
2025 | shell0++; | |
2026 | else | |
2027 | shell0 = shell; | |
2028 | ||
3c0ef626 | 2029 | /* |
2030 | * If we have no command, execute the shell. In this case, the shell | |
2031 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
2032 | * this is a login shell. | |
2033 | */ | |
2034 | if (!command) { | |
e9702f7d | 2035 | char argv0[256]; |
3c0ef626 | 2036 | |
e9702f7d | 2037 | /* Start the shell. Set initial character to '-'. */ |
2038 | argv0[0] = '-'; | |
3c0ef626 | 2039 | |
e9702f7d | 2040 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
2041 | >= sizeof(argv0) - 1) { | |
2042 | errno = EINVAL; | |
3c0ef626 | 2043 | perror(shell); |
2044 | exit(1); | |
e9702f7d | 2045 | } |
3c0ef626 | 2046 | |
e9702f7d | 2047 | /* Execute the shell. */ |
2048 | argv[0] = argv0; | |
2049 | argv[1] = NULL; | |
5ab1e3bd | 2050 | execve(shell, argv, environ); |
3c0ef626 | 2051 | |
e9702f7d | 2052 | /* Executing the shell failed. */ |
2053 | perror(shell); | |
2054 | exit(1); | |
3c0ef626 | 2055 | } |
2056 | /* | |
2057 | * Execute the command using the user's shell. This uses the -c | |
2058 | * option to execute the command. | |
2059 | */ | |
e9702f7d | 2060 | argv[0] = (char *) shell0; |
3c0ef626 | 2061 | argv[1] = "-c"; |
2062 | argv[2] = (char *) command; | |
2063 | argv[3] = NULL; | |
5ab1e3bd | 2064 | execve(shell, argv, environ); |
3c0ef626 | 2065 | perror(shell); |
2066 | exit(1); | |
2067 | } | |
2068 | ||
5156b1a1 | 2069 | void |
2070 | session_unused(int id) | |
2071 | { | |
2072 | debug3("%s: session id %d unused", __func__, id); | |
2073 | if (id >= options.max_sessions || | |
2074 | id >= sessions_nalloc) { | |
2075 | fatal("%s: insane session id %d (max %d nalloc %d)", | |
2076 | __func__, id, options.max_sessions, sessions_nalloc); | |
2077 | } | |
2078 | bzero(&sessions[id], sizeof(*sessions)); | |
2079 | sessions[id].self = id; | |
2080 | sessions[id].used = 0; | |
2081 | sessions[id].chanid = -1; | |
2082 | sessions[id].ptyfd = -1; | |
2083 | sessions[id].ttyfd = -1; | |
2084 | sessions[id].ptymaster = -1; | |
2085 | sessions[id].x11_chanids = NULL; | |
2086 | sessions[id].next_unused = sessions_first_unused; | |
2087 | sessions_first_unused = id; | |
2088 | } | |
2089 | ||
3c0ef626 | 2090 | Session * |
2091 | session_new(void) | |
2092 | { | |
5156b1a1 | 2093 | Session *s, *tmp; |
2094 | ||
2095 | if (sessions_first_unused == -1) { | |
2096 | if (sessions_nalloc >= options.max_sessions) | |
2097 | return NULL; | |
2098 | debug2("%s: allocate (allocated %d max %d)", | |
2099 | __func__, sessions_nalloc, options.max_sessions); | |
2100 | tmp = xrealloc(sessions, sessions_nalloc + 1, | |
2101 | sizeof(*sessions)); | |
2102 | if (tmp == NULL) { | |
2103 | error("%s: cannot allocate %d sessions", | |
2104 | __func__, sessions_nalloc + 1); | |
2105 | return NULL; | |
3c0ef626 | 2106 | } |
5156b1a1 | 2107 | sessions = tmp; |
2108 | session_unused(sessions_nalloc++); | |
3c0ef626 | 2109 | } |
5156b1a1 | 2110 | |
2111 | if (sessions_first_unused >= sessions_nalloc || | |
2112 | sessions_first_unused < 0) { | |
2113 | fatal("%s: insane first_unused %d max %d nalloc %d", | |
2114 | __func__, sessions_first_unused, options.max_sessions, | |
2115 | sessions_nalloc); | |
3c0ef626 | 2116 | } |
5156b1a1 | 2117 | |
2118 | s = &sessions[sessions_first_unused]; | |
2119 | if (s->used) { | |
2120 | fatal("%s: session %d already used", | |
2121 | __func__, sessions_first_unused); | |
2122 | } | |
2123 | sessions_first_unused = s->next_unused; | |
2124 | s->used = 1; | |
2125 | s->next_unused = -1; | |
2126 | debug("session_new: session %d", s->self); | |
2127 | ||
2128 | return s; | |
3c0ef626 | 2129 | } |
2130 | ||
2131 | static void | |
2132 | session_dump(void) | |
2133 | { | |
2134 | int i; | |
5156b1a1 | 2135 | for (i = 0; i < sessions_nalloc; i++) { |
3c0ef626 | 2136 | Session *s = &sessions[i]; |
5156b1a1 | 2137 | |
2138 | debug("dump: used %d next_unused %d session %d %p " | |
2139 | "channel %d pid %ld", | |
3c0ef626 | 2140 | s->used, |
5156b1a1 | 2141 | s->next_unused, |
3c0ef626 | 2142 | s->self, |
2143 | s, | |
2144 | s->chanid, | |
44a053a3 | 2145 | (long)s->pid); |
3c0ef626 | 2146 | } |
2147 | } | |
2148 | ||
2149 | int | |
2150 | session_open(Authctxt *authctxt, int chanid) | |
2151 | { | |
2152 | Session *s = session_new(); | |
2153 | debug("session_open: channel %d", chanid); | |
2154 | if (s == NULL) { | |
2155 | error("no more sessions"); | |
2156 | return 0; | |
2157 | } | |
2158 | s->authctxt = authctxt; | |
2159 | s->pw = authctxt->pw; | |
540d72c3 | 2160 | if (s->pw == NULL || !authctxt->valid) |
3c0ef626 | 2161 | fatal("no user for session %d", s->self); |
2162 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
2163 | s->chanid = chanid; | |
2164 | return 1; | |
2165 | } | |
2166 | ||
350391c5 | 2167 | Session * |
2168 | session_by_tty(char *tty) | |
2169 | { | |
2170 | int i; | |
5156b1a1 | 2171 | for (i = 0; i < sessions_nalloc; i++) { |
350391c5 | 2172 | Session *s = &sessions[i]; |
2173 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
2174 | debug("session_by_tty: session %d tty %s", i, tty); | |
2175 | return s; | |
2176 | } | |
2177 | } | |
2178 | debug("session_by_tty: unknown tty %.100s", tty); | |
2179 | session_dump(); | |
2180 | return NULL; | |
2181 | } | |
2182 | ||
3c0ef626 | 2183 | static Session * |
2184 | session_by_channel(int id) | |
2185 | { | |
2186 | int i; | |
5156b1a1 | 2187 | for (i = 0; i < sessions_nalloc; i++) { |
3c0ef626 | 2188 | Session *s = &sessions[i]; |
2189 | if (s->used && s->chanid == id) { | |
5156b1a1 | 2190 | debug("session_by_channel: session %d channel %d", |
2191 | i, id); | |
3c0ef626 | 2192 | return s; |
2193 | } | |
2194 | } | |
2195 | debug("session_by_channel: unknown channel %d", id); | |
2196 | session_dump(); | |
2197 | return NULL; | |
2198 | } | |
2199 | ||
2ce0bfe4 | 2200 | static Session * |
2201 | session_by_x11_channel(int id) | |
2202 | { | |
2203 | int i, j; | |
2204 | ||
5156b1a1 | 2205 | for (i = 0; i < sessions_nalloc; i++) { |
2ce0bfe4 | 2206 | Session *s = &sessions[i]; |
2207 | ||
2208 | if (s->x11_chanids == NULL || !s->used) | |
2209 | continue; | |
2210 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
2211 | if (s->x11_chanids[j] == id) { | |
2212 | debug("session_by_x11_channel: session %d " | |
2213 | "channel %d", s->self, id); | |
2214 | return s; | |
2215 | } | |
2216 | } | |
2217 | } | |
2218 | debug("session_by_x11_channel: unknown channel %d", id); | |
2219 | session_dump(); | |
2220 | return NULL; | |
2221 | } | |
2222 | ||
3c0ef626 | 2223 | static Session * |
2224 | session_by_pid(pid_t pid) | |
2225 | { | |
2226 | int i; | |
44a053a3 | 2227 | debug("session_by_pid: pid %ld", (long)pid); |
5156b1a1 | 2228 | for (i = 0; i < sessions_nalloc; i++) { |
3c0ef626 | 2229 | Session *s = &sessions[i]; |
2230 | if (s->used && s->pid == pid) | |
2231 | return s; | |
2232 | } | |
44a053a3 | 2233 | error("session_by_pid: unknown pid %ld", (long)pid); |
3c0ef626 | 2234 | session_dump(); |
2235 | return NULL; | |
2236 | } | |
2237 | ||
2238 | static int | |
2239 | session_window_change_req(Session *s) | |
2240 | { | |
2241 | s->col = packet_get_int(); | |
2242 | s->row = packet_get_int(); | |
2243 | s->xpixel = packet_get_int(); | |
2244 | s->ypixel = packet_get_int(); | |
e9702f7d | 2245 | packet_check_eom(); |
3c0ef626 | 2246 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
2247 | return 1; | |
2248 | } | |
2249 | ||
2250 | static int | |
2251 | session_pty_req(Session *s) | |
2252 | { | |
2253 | u_int len; | |
2254 | int n_bytes; | |
2255 | ||
2256 | if (no_pty_flag) { | |
2257 | debug("Allocating a pty not permitted for this authentication."); | |
2258 | return 0; | |
2259 | } | |
2260 | if (s->ttyfd != -1) { | |
2261 | packet_disconnect("Protocol error: you already have a pty."); | |
2262 | return 0; | |
2263 | } | |
2264 | ||
2265 | s->term = packet_get_string(&len); | |
2266 | ||
2267 | if (compat20) { | |
2268 | s->col = packet_get_int(); | |
2269 | s->row = packet_get_int(); | |
2270 | } else { | |
2271 | s->row = packet_get_int(); | |
2272 | s->col = packet_get_int(); | |
2273 | } | |
2274 | s->xpixel = packet_get_int(); | |
2275 | s->ypixel = packet_get_int(); | |
2276 | ||
2277 | if (strcmp(s->term, "") == 0) { | |
2278 | xfree(s->term); | |
2279 | s->term = NULL; | |
2280 | } | |
2281 | ||
2282 | /* Allocate a pty and open it. */ | |
2283 | debug("Allocating pty."); | |
5156b1a1 | 2284 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, |
2285 | sizeof(s->tty)))) { | |
3c0ef626 | 2286 | if (s->term) |
2287 | xfree(s->term); | |
2288 | s->term = NULL; | |
2289 | s->ptyfd = -1; | |
2290 | s->ttyfd = -1; | |
2291 | error("session_pty_req: session %d alloc failed", s->self); | |
2292 | return 0; | |
2293 | } | |
2294 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
2295 | ||
2296 | /* for SSH1 the tty modes length is not given */ | |
2297 | if (!compat20) | |
2298 | n_bytes = packet_remaining(); | |
2299 | tty_parse_modes(s->ttyfd, &n_bytes); | |
2300 | ||
350391c5 | 2301 | if (!use_privsep) |
2302 | pty_setowner(s->pw, s->tty); | |
3c0ef626 | 2303 | |
2304 | /* Set window size from the packet. */ | |
2305 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
2306 | ||
e9702f7d | 2307 | packet_check_eom(); |
3c0ef626 | 2308 | session_proctitle(s); |
2309 | return 1; | |
2310 | } | |
2311 | ||
2312 | static int | |
2313 | session_subsystem_req(Session *s) | |
2314 | { | |
2315 | struct stat st; | |
2316 | u_int len; | |
2317 | int success = 0; | |
30460aeb | 2318 | char *prog, *cmd, *subsys = packet_get_string(&len); |
2ce0bfe4 | 2319 | u_int i; |
3c0ef626 | 2320 | |
e9702f7d | 2321 | packet_check_eom(); |
7cac2b65 | 2322 | logit("subsystem request for %.100s", subsys); |
3c0ef626 | 2323 | |
2324 | for (i = 0; i < options.num_subsystems; i++) { | |
2325 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { | |
30460aeb | 2326 | prog = options.subsystem_command[i]; |
2327 | cmd = options.subsystem_args[i]; | |
e74dc197 | 2328 | if (!strcmp(INTERNAL_SFTP_NAME, prog)) { |
2329 | s->is_subsystem = SUBSYSTEM_INT_SFTP; | |
2330 | } else if (stat(prog, &st) < 0) { | |
30460aeb | 2331 | error("subsystem: cannot stat %s: %s", prog, |
3c0ef626 | 2332 | strerror(errno)); |
2333 | break; | |
e74dc197 | 2334 | } else { |
2335 | s->is_subsystem = SUBSYSTEM_EXT; | |
3c0ef626 | 2336 | } |
2337 | debug("subsystem: exec() %s", cmd); | |
5156b1a1 | 2338 | success = do_exec(s, cmd) == 0; |
e9702f7d | 2339 | break; |
3c0ef626 | 2340 | } |
2341 | } | |
2342 | ||
2343 | if (!success) | |
7cac2b65 | 2344 | logit("subsystem request for %.100s failed, subsystem not found", |
3c0ef626 | 2345 | subsys); |
2346 | ||
2347 | xfree(subsys); | |
2348 | return success; | |
2349 | } | |
2350 | ||
2351 | static int | |
2352 | session_x11_req(Session *s) | |
2353 | { | |
2354 | int success; | |
2355 | ||
2ce0bfe4 | 2356 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
2357 | error("session_x11_req: session %d: " | |
08822d99 | 2358 | "x11 forwarding already active", s->self); |
2ce0bfe4 | 2359 | return 0; |
2360 | } | |
3c0ef626 | 2361 | s->single_connection = packet_get_char(); |
2362 | s->auth_proto = packet_get_string(NULL); | |
2363 | s->auth_data = packet_get_string(NULL); | |
2364 | s->screen = packet_get_int(); | |
e9702f7d | 2365 | packet_check_eom(); |
3c0ef626 | 2366 | |
2367 | success = session_setup_x11fwd(s); | |
2368 | if (!success) { | |
2369 | xfree(s->auth_proto); | |
2370 | xfree(s->auth_data); | |
2371 | s->auth_proto = NULL; | |
2372 | s->auth_data = NULL; | |
2373 | } | |
2374 | return success; | |
2375 | } | |
2376 | ||
2377 | static int | |
2378 | session_shell_req(Session *s) | |
2379 | { | |
e9702f7d | 2380 | packet_check_eom(); |
5156b1a1 | 2381 | return do_exec(s, NULL) == 0; |
3c0ef626 | 2382 | } |
2383 | ||
2384 | static int | |
2385 | session_exec_req(Session *s) | |
2386 | { | |
5156b1a1 | 2387 | u_int len, success; |
2388 | ||
3c0ef626 | 2389 | char *command = packet_get_string(&len); |
e9702f7d | 2390 | packet_check_eom(); |
5156b1a1 | 2391 | success = do_exec(s, command) == 0; |
3c0ef626 | 2392 | xfree(command); |
5156b1a1 | 2393 | return success; |
3c0ef626 | 2394 | } |
2395 | ||
7cac2b65 | 2396 | static int |
2397 | session_break_req(Session *s) | |
2398 | { | |
7cac2b65 | 2399 | |
7e82606e | 2400 | packet_get_int(); /* ignored */ |
7cac2b65 | 2401 | packet_check_eom(); |
2402 | ||
5156b1a1 | 2403 | if (s->ttyfd == -1 || tcsendbreak(s->ttyfd, 0) < 0) |
7cac2b65 | 2404 | return 0; |
2405 | return 1; | |
2406 | } | |
2407 | ||
7e82606e | 2408 | static int |
2409 | session_env_req(Session *s) | |
2410 | { | |
2411 | char *name, *val; | |
2412 | u_int name_len, val_len, i; | |
2413 | ||
2414 | name = packet_get_string(&name_len); | |
2415 | val = packet_get_string(&val_len); | |
2416 | packet_check_eom(); | |
2417 | ||
2418 | /* Don't set too many environment variables */ | |
2419 | if (s->num_env > 128) { | |
2420 | debug2("Ignoring env request %s: too many env vars", name); | |
2421 | goto fail; | |
2422 | } | |
2423 | ||
2424 | for (i = 0; i < options.num_accept_env; i++) { | |
2425 | if (match_pattern(name, options.accept_env[i])) { | |
2426 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
30460aeb | 2427 | s->env = xrealloc(s->env, s->num_env + 1, |
2428 | sizeof(*s->env)); | |
7e82606e | 2429 | s->env[s->num_env].name = name; |
2430 | s->env[s->num_env].val = val; | |
2431 | s->num_env++; | |
2432 | return (1); | |
2433 | } | |
2434 | } | |
2435 | debug2("Ignoring env request %s: disallowed name", name); | |
2436 | ||
2437 | fail: | |
2438 | xfree(name); | |
2439 | xfree(val); | |
2440 | return (0); | |
2441 | } | |
2442 | ||
3c0ef626 | 2443 | static int |
2444 | session_auth_agent_req(Session *s) | |
2445 | { | |
2446 | static int called = 0; | |
e9702f7d | 2447 | packet_check_eom(); |
5156b1a1 | 2448 | if (no_agent_forwarding_flag || !options.allow_agent_forwarding) { |
3c0ef626 | 2449 | debug("session_auth_agent_req: no_agent_forwarding_flag"); |
2450 | return 0; | |
2451 | } | |
2452 | if (called) { | |
2453 | return 0; | |
2454 | } else { | |
2455 | called = 1; | |
2456 | return auth_input_request_forwarding(s->pw); | |
2457 | } | |
2458 | } | |
2459 | ||
e9702f7d | 2460 | int |
2461 | session_input_channel_req(Channel *c, const char *rtype) | |
3c0ef626 | 2462 | { |
3c0ef626 | 2463 | int success = 0; |
3c0ef626 | 2464 | Session *s; |
3c0ef626 | 2465 | |
e9702f7d | 2466 | if ((s = session_by_channel(c->self)) == NULL) { |
7cac2b65 | 2467 | logit("session_input_channel_req: no session %d req %.100s", |
e9702f7d | 2468 | c->self, rtype); |
2469 | return 0; | |
2470 | } | |
2471 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
3c0ef626 | 2472 | |
2473 | /* | |
2474 | * a session is in LARVAL state until a shell, a command | |
2475 | * or a subsystem is executed | |
2476 | */ | |
2477 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2478 | if (strcmp(rtype, "shell") == 0) { | |
2479 | success = session_shell_req(s); | |
2480 | } else if (strcmp(rtype, "exec") == 0) { | |
2481 | success = session_exec_req(s); | |
2482 | } else if (strcmp(rtype, "pty-req") == 0) { | |
0b90ac93 | 2483 | success = session_pty_req(s); |
3c0ef626 | 2484 | } else if (strcmp(rtype, "x11-req") == 0) { |
2485 | success = session_x11_req(s); | |
2486 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { | |
2487 | success = session_auth_agent_req(s); | |
2488 | } else if (strcmp(rtype, "subsystem") == 0) { | |
2489 | success = session_subsystem_req(s); | |
7e82606e | 2490 | } else if (strcmp(rtype, "env") == 0) { |
2491 | success = session_env_req(s); | |
3c0ef626 | 2492 | } |
2493 | } | |
2494 | if (strcmp(rtype, "window-change") == 0) { | |
2495 | success = session_window_change_req(s); | |
7e82606e | 2496 | } else if (strcmp(rtype, "break") == 0) { |
2497 | success = session_break_req(s); | |
3c0ef626 | 2498 | } |
7e82606e | 2499 | |
e9702f7d | 2500 | return success; |
3c0ef626 | 2501 | } |
2502 | ||
2503 | void | |
5156b1a1 | 2504 | session_set_fds(Session *s, int fdin, int fdout, int fderr, int is_tty) |
3c0ef626 | 2505 | { |
2506 | if (!compat20) | |
2507 | fatal("session_set_fds: called for proto != 2.0"); | |
2508 | /* | |
2509 | * now that have a child and a pipe to the child, | |
2510 | * we can activate our channel and register the fd's | |
2511 | */ | |
2512 | if (s->chanid == -1) | |
2513 | fatal("no channel for session %d", s->self); | |
d3057ca4 | 2514 | if (options.hpn_disabled) |
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); |
d3057ca4 | 2519 | else |
2520 | channel_set_fds(s->chanid, | |
2521 | fdout, fdin, fderr, | |
2522 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
2523 | 1, is_tty, options.hpn_buffer_size); | |
3c0ef626 | 2524 | } |
2525 | ||
2526 | /* | |
2527 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2528 | * (e.g., due to a dropped connection). | |
2529 | */ | |
350391c5 | 2530 | void |
540d72c3 | 2531 | session_pty_cleanup2(Session *s) |
3c0ef626 | 2532 | { |
3c0ef626 | 2533 | if (s == NULL) { |
2534 | error("session_pty_cleanup: no session"); | |
2535 | return; | |
2536 | } | |
2537 | if (s->ttyfd == -1) | |
2538 | return; | |
2539 | ||
2540 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); | |
2541 | ||
2542 | /* Record that the user has logged out. */ | |
2543 | if (s->pid != 0) | |
e9702f7d | 2544 | record_logout(s->pid, s->tty, s->pw->pw_name); |
3c0ef626 | 2545 | |
2546 | /* Release the pseudo-tty. */ | |
350391c5 | 2547 | if (getuid() == 0) |
2548 | pty_release(s->tty); | |
3c0ef626 | 2549 | |
2550 | /* | |
2551 | * Close the server side of the socket pairs. We must do this after | |
2552 | * the pty cleanup, so that another process doesn't get this pty | |
2553 | * while we're still cleaning up. | |
2554 | */ | |
5156b1a1 | 2555 | if (s->ptymaster != -1 && close(s->ptymaster) < 0) |
2556 | error("close(s->ptymaster/%d): %s", | |
2557 | s->ptymaster, strerror(errno)); | |
3c0ef626 | 2558 | |
2559 | /* unlink pty from session */ | |
2560 | s->ttyfd = -1; | |
2561 | } | |
2562 | ||
350391c5 | 2563 | void |
540d72c3 | 2564 | session_pty_cleanup(Session *s) |
350391c5 | 2565 | { |
540d72c3 | 2566 | PRIVSEP(session_pty_cleanup2(s)); |
350391c5 | 2567 | } |
2568 | ||
d03f4262 | 2569 | static char * |
2570 | sig2name(int sig) | |
2571 | { | |
2572 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2573 | SSH_SIG(ABRT); | |
2574 | SSH_SIG(ALRM); | |
2575 | SSH_SIG(FPE); | |
2576 | SSH_SIG(HUP); | |
2577 | SSH_SIG(ILL); | |
2578 | SSH_SIG(INT); | |
2579 | SSH_SIG(KILL); | |
2580 | SSH_SIG(PIPE); | |
2581 | SSH_SIG(QUIT); | |
2582 | SSH_SIG(SEGV); | |
2583 | SSH_SIG(TERM); | |
2584 | SSH_SIG(USR1); | |
2585 | SSH_SIG(USR2); | |
2586 | #undef SSH_SIG | |
2587 | return "SIG@openssh.com"; | |
2588 | } | |
2589 | ||
2ce0bfe4 | 2590 | static void |
2591 | session_close_x11(int id) | |
2592 | { | |
2593 | Channel *c; | |
2594 | ||
08822d99 | 2595 | if ((c = channel_by_id(id)) == NULL) { |
2ce0bfe4 | 2596 | debug("session_close_x11: x11 channel %d missing", id); |
2597 | } else { | |
2598 | /* Detach X11 listener */ | |
2599 | debug("session_close_x11: detach x11 channel %d", id); | |
2600 | channel_cancel_cleanup(id); | |
2601 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2602 | chan_mark_dead(c); | |
2603 | } | |
2604 | } | |
2605 | ||
2606 | static void | |
2607 | session_close_single_x11(int id, void *arg) | |
2608 | { | |
2609 | Session *s; | |
2610 | u_int i; | |
2611 | ||
2612 | debug3("session_close_single_x11: channel %d", id); | |
2613 | channel_cancel_cleanup(id); | |
0b90ac93 | 2614 | if ((s = session_by_x11_channel(id)) == NULL) |
2ce0bfe4 | 2615 | fatal("session_close_single_x11: no x11 channel %d", id); |
2616 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2617 | debug("session_close_single_x11: session %d: " | |
2618 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2619 | /* | |
2620 | * The channel "id" is already closing, but make sure we | |
2621 | * close all of its siblings. | |
2622 | */ | |
2623 | if (s->x11_chanids[i] != id) | |
2624 | session_close_x11(s->x11_chanids[i]); | |
2625 | } | |
2626 | xfree(s->x11_chanids); | |
2627 | s->x11_chanids = NULL; | |
2628 | if (s->display) { | |
2629 | xfree(s->display); | |
2630 | s->display = NULL; | |
2631 | } | |
2632 | if (s->auth_proto) { | |
2633 | xfree(s->auth_proto); | |
2634 | s->auth_proto = NULL; | |
2635 | } | |
2636 | if (s->auth_data) { | |
2637 | xfree(s->auth_data); | |
2638 | s->auth_data = NULL; | |
2639 | } | |
2640 | if (s->auth_display) { | |
2641 | xfree(s->auth_display); | |
2642 | s->auth_display = NULL; | |
2643 | } | |
2644 | } | |
2645 | ||
3c0ef626 | 2646 | static void |
2647 | session_exit_message(Session *s, int status) | |
2648 | { | |
2649 | Channel *c; | |
e9702f7d | 2650 | |
2651 | if ((c = channel_lookup(s->chanid)) == NULL) | |
3c0ef626 | 2652 | fatal("session_exit_message: session %d: no channel %d", |
2653 | s->self, s->chanid); | |
44a053a3 | 2654 | debug("session_exit_message: session %d channel %d pid %ld", |
2655 | s->self, s->chanid, (long)s->pid); | |
3c0ef626 | 2656 | |
2657 | if (WIFEXITED(status)) { | |
e9702f7d | 2658 | channel_request_start(s->chanid, "exit-status", 0); |
3c0ef626 | 2659 | packet_put_int(WEXITSTATUS(status)); |
2660 | packet_send(); | |
2661 | } else if (WIFSIGNALED(status)) { | |
e9702f7d | 2662 | channel_request_start(s->chanid, "exit-signal", 0); |
d03f4262 | 2663 | packet_put_cstring(sig2name(WTERMSIG(status))); |
3c0ef626 | 2664 | #ifdef WCOREDUMP |
e74dc197 | 2665 | packet_put_char(WCOREDUMP(status)? 1 : 0); |
3c0ef626 | 2666 | #else /* WCOREDUMP */ |
2667 | packet_put_char(0); | |
2668 | #endif /* WCOREDUMP */ | |
2669 | packet_put_cstring(""); | |
2670 | packet_put_cstring(""); | |
2671 | packet_send(); | |
2672 | } else { | |
2673 | /* Some weird exit cause. Just exit. */ | |
2674 | packet_disconnect("wait returned status %04x.", status); | |
2675 | } | |
2676 | ||
2677 | /* disconnect channel */ | |
2678 | debug("session_exit_message: release channel %d", s->chanid); | |
08822d99 | 2679 | |
2680 | /* | |
2681 | * Adjust cleanup callback attachment to send close messages when | |
30460aeb | 2682 | * the channel gets EOF. The session will be then be closed |
08822d99 | 2683 | * by session_close_by_channel when the childs close their fds. |
2684 | */ | |
2685 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2686 | ||
3c0ef626 | 2687 | /* |
2688 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2689 | * interested in data we write. | |
2690 | * Note that we must not call 'chan_read_failed', since there could | |
2691 | * be some more data waiting in the pipe. | |
2692 | */ | |
2693 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2694 | chan_write_failed(c); | |
3c0ef626 | 2695 | } |
2696 | ||
350391c5 | 2697 | void |
3c0ef626 | 2698 | session_close(Session *s) |
2699 | { | |
2ce0bfe4 | 2700 | u_int i; |
7e82606e | 2701 | |
44a053a3 | 2702 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
540d72c3 | 2703 | if (s->ttyfd != -1) |
3c0ef626 | 2704 | session_pty_cleanup(s); |
3c0ef626 | 2705 | if (s->term) |
2706 | xfree(s->term); | |
2707 | if (s->display) | |
2708 | xfree(s->display); | |
2ce0bfe4 | 2709 | if (s->x11_chanids) |
2710 | xfree(s->x11_chanids); | |
e9702f7d | 2711 | if (s->auth_display) |
2712 | xfree(s->auth_display); | |
3c0ef626 | 2713 | if (s->auth_data) |
2714 | xfree(s->auth_data); | |
2715 | if (s->auth_proto) | |
2716 | xfree(s->auth_proto); | |
30460aeb | 2717 | if (s->env != NULL) { |
2718 | for (i = 0; i < s->num_env; i++) { | |
2719 | xfree(s->env[i].name); | |
2720 | xfree(s->env[i].val); | |
2721 | } | |
7e82606e | 2722 | xfree(s->env); |
30460aeb | 2723 | } |
3c0ef626 | 2724 | session_proctitle(s); |
5156b1a1 | 2725 | session_unused(s->self); |
3c0ef626 | 2726 | } |
2727 | ||
2728 | void | |
2729 | session_close_by_pid(pid_t pid, int status) | |
2730 | { | |
2731 | Session *s = session_by_pid(pid); | |
2732 | if (s == NULL) { | |
44a053a3 | 2733 | debug("session_close_by_pid: no session for pid %ld", |
2734 | (long)pid); | |
3c0ef626 | 2735 | return; |
2736 | } | |
2737 | if (s->chanid != -1) | |
2738 | session_exit_message(s, status); | |
08822d99 | 2739 | if (s->ttyfd != -1) |
2740 | session_pty_cleanup(s); | |
4b6dae8f | 2741 | s->pid = 0; |
3c0ef626 | 2742 | } |
2743 | ||
2744 | /* | |
2745 | * this is called when a channel dies before | |
2746 | * the session 'child' itself dies | |
2747 | */ | |
2748 | void | |
2749 | session_close_by_channel(int id, void *arg) | |
2750 | { | |
2751 | Session *s = session_by_channel(id); | |
08822d99 | 2752 | u_int i; |
2ce0bfe4 | 2753 | |
3c0ef626 | 2754 | if (s == NULL) { |
2755 | debug("session_close_by_channel: no session for id %d", id); | |
2756 | return; | |
2757 | } | |
44a053a3 | 2758 | debug("session_close_by_channel: channel %d child %ld", |
2759 | id, (long)s->pid); | |
3c0ef626 | 2760 | if (s->pid != 0) { |
2761 | debug("session_close_by_channel: channel %d: has child", id); | |
2762 | /* | |
2763 | * delay detach of session, but release pty, since | |
2764 | * the fd's to the child are already closed | |
2765 | */ | |
540d72c3 | 2766 | if (s->ttyfd != -1) |
3c0ef626 | 2767 | session_pty_cleanup(s); |
3c0ef626 | 2768 | return; |
2769 | } | |
2770 | /* detach by removing callback */ | |
2771 | channel_cancel_cleanup(s->chanid); | |
08822d99 | 2772 | |
2773 | /* Close any X11 listeners associated with this session */ | |
2774 | if (s->x11_chanids != NULL) { | |
2775 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2776 | session_close_x11(s->x11_chanids[i]); | |
2777 | s->x11_chanids[i] = -1; | |
2778 | } | |
2779 | } | |
2780 | ||
3c0ef626 | 2781 | s->chanid = -1; |
2782 | session_close(s); | |
2783 | } | |
2784 | ||
2785 | void | |
350391c5 | 2786 | session_destroy_all(void (*closefunc)(Session *)) |
3c0ef626 | 2787 | { |
2788 | int i; | |
5156b1a1 | 2789 | for (i = 0; i < sessions_nalloc; i++) { |
3c0ef626 | 2790 | Session *s = &sessions[i]; |
350391c5 | 2791 | if (s->used) { |
2792 | if (closefunc != NULL) | |
2793 | closefunc(s); | |
2794 | else | |
2795 | session_close(s); | |
2796 | } | |
3c0ef626 | 2797 | } |
2798 | } | |
2799 | ||
2800 | static char * | |
2801 | session_tty_list(void) | |
2802 | { | |
2803 | static char buf[1024]; | |
2804 | int i; | |
bfe49944 | 2805 | char *cp; |
2806 | ||
3c0ef626 | 2807 | buf[0] = '\0'; |
5156b1a1 | 2808 | for (i = 0; i < sessions_nalloc; i++) { |
3c0ef626 | 2809 | Session *s = &sessions[i]; |
2810 | if (s->used && s->ttyfd != -1) { | |
540d72c3 | 2811 | |
bfe49944 | 2812 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2813 | cp = strrchr(s->tty, '/'); | |
2814 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2815 | } else | |
2816 | cp = s->tty + 5; | |
540d72c3 | 2817 | |
3c0ef626 | 2818 | if (buf[0] != '\0') |
2819 | strlcat(buf, ",", sizeof buf); | |
bfe49944 | 2820 | strlcat(buf, cp, sizeof buf); |
3c0ef626 | 2821 | } |
2822 | } | |
2823 | if (buf[0] == '\0') | |
2824 | strlcpy(buf, "notty", sizeof buf); | |
2825 | return buf; | |
2826 | } | |
2827 | ||
2828 | void | |
2829 | session_proctitle(Session *s) | |
2830 | { | |
2831 | if (s->pw == NULL) | |
2832 | error("no user for session %d", s->self); | |
2833 | else | |
2834 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2835 | } | |
2836 | ||
2837 | int | |
2838 | session_setup_x11fwd(Session *s) | |
2839 | { | |
2840 | struct stat st; | |
e9702f7d | 2841 | char display[512], auth_display[512]; |
2842 | char hostname[MAXHOSTNAMELEN]; | |
2ce0bfe4 | 2843 | u_int i; |
3c0ef626 | 2844 | |
2845 | if (no_x11_forwarding_flag) { | |
2846 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2847 | return 0; | |
2848 | } | |
2849 | if (!options.x11_forwarding) { | |
2850 | debug("X11 forwarding disabled in server configuration file."); | |
2851 | return 0; | |
2852 | } | |
2853 | if (!options.xauth_location || | |
2854 | (stat(options.xauth_location, &st) == -1)) { | |
2855 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2856 | return 0; | |
2857 | } | |
2858 | if (options.use_login) { | |
2859 | packet_send_debug("X11 forwarding disabled; " | |
2860 | "not compatible with UseLogin=yes."); | |
2861 | return 0; | |
2862 | } | |
2863 | if (s->display != NULL) { | |
2864 | debug("X11 display already set."); | |
2865 | return 0; | |
2866 | } | |
276b07a3 | 2867 | if (x11_create_display_inet(options.x11_display_offset, |
2868 | options.x11_use_localhost, s->single_connection, | |
d3057ca4 | 2869 | &s->display_number, &s->x11_chanids) == -1) { |
3c0ef626 | 2870 | debug("x11_create_display_inet failed."); |
2871 | return 0; | |
2872 | } | |
2ce0bfe4 | 2873 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2874 | channel_register_cleanup(s->x11_chanids[i], | |
08822d99 | 2875 | session_close_single_x11, 0); |
2ce0bfe4 | 2876 | } |
e9702f7d | 2877 | |
2878 | /* Set up a suitable value for the DISPLAY variable. */ | |
2879 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2880 | fatal("gethostname: %.100s", strerror(errno)); | |
2881 | /* | |
2882 | * auth_display must be used as the displayname when the | |
2883 | * authorization entry is added with xauth(1). This will be | |
2884 | * different than the DISPLAY string for localhost displays. | |
2885 | */ | |
2886 | if (options.x11_use_localhost) { | |
276b07a3 | 2887 | snprintf(display, sizeof display, "localhost:%u.%u", |
e9702f7d | 2888 | s->display_number, s->screen); |
276b07a3 | 2889 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
e9702f7d | 2890 | s->display_number, s->screen); |
2891 | s->display = xstrdup(display); | |
2892 | s->auth_display = xstrdup(auth_display); | |
2893 | } else { | |
2894 | #ifdef IPADDR_IN_DISPLAY | |
2895 | struct hostent *he; | |
2896 | struct in_addr my_addr; | |
2897 | ||
2898 | he = gethostbyname(hostname); | |
2899 | if (he == NULL) { | |
2900 | error("Can't get IP address for X11 DISPLAY."); | |
2901 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2902 | return 0; | |
2903 | } | |
2904 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
276b07a3 | 2905 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
e9702f7d | 2906 | s->display_number, s->screen); |
2907 | #else | |
276b07a3 | 2908 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
e9702f7d | 2909 | s->display_number, s->screen); |
2910 | #endif | |
2911 | s->display = xstrdup(display); | |
2912 | s->auth_display = xstrdup(display); | |
2913 | } | |
2914 | ||
3c0ef626 | 2915 | return 1; |
2916 | } | |
2917 | ||
2918 | static void | |
2919 | do_authenticated2(Authctxt *authctxt) | |
2920 | { | |
2921 | server_loop2(authctxt); | |
540d72c3 | 2922 | } |
2923 | ||
2924 | void | |
2925 | do_cleanup(Authctxt *authctxt) | |
2926 | { | |
2927 | static int called = 0; | |
2928 | ||
2929 | debug("do_cleanup"); | |
2930 | ||
2931 | /* no cleanup if we're in the child for login shell */ | |
2932 | if (is_child) | |
2933 | return; | |
2934 | ||
2935 | /* avoid double cleanup */ | |
2936 | if (called) | |
2937 | return; | |
2938 | called = 1; | |
2939 | ||
fa0f0f45 | 2940 | if (authctxt == NULL) |
540d72c3 | 2941 | return; |
fa0f0f45 | 2942 | |
2943 | #ifdef USE_PAM | |
2944 | if (options.use_pam) { | |
2945 | sshpam_cleanup(); | |
2946 | sshpam_thread_cleanup(); | |
2947 | } | |
2948 | #endif | |
2949 | ||
2950 | if (!authctxt->authenticated) | |
2951 | return; | |
2952 | ||
540d72c3 | 2953 | #ifdef KRB5 |
2954 | if (options.kerberos_ticket_cleanup && | |
2955 | authctxt->krb5_ctx) | |
2956 | krb5_cleanup_proc(authctxt); | |
5598e598 | 2957 | #endif |
540d72c3 | 2958 | |
2959 | #ifdef GSSAPI | |
2960 | if (compat20 && options.gss_cleanup_creds) | |
2961 | ssh_gssapi_cleanup_creds(); | |
2962 | #endif | |
2963 | ||
540d72c3 | 2964 | /* remove agent socket */ |
2965 | auth_sock_cleanup_proc(authctxt->pw); | |
2966 | ||
2967 | /* | |
2968 | * Cleanup ptys/utmp only if privsep is disabled, | |
2969 | * or if running in monitor. | |
2970 | */ | |
2971 | if (!use_privsep || mm_is_monitor()) | |
2972 | session_destroy_all(session_pty_cleanup2); | |
3c0ef626 | 2973 | } |