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3c0ef626 | 1 | /* |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
4 | * | |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | * | |
11 | * SSH2 support by Markus Friedl. | |
12 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. | |
13 | * | |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions | |
16 | * are met: | |
17 | * 1. Redistributions of source code must retain the above copyright | |
18 | * notice, this list of conditions and the following disclaimer. | |
19 | * 2. Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
33 | */ | |
34 | ||
35 | #include "includes.h" | |
08822d99 | 36 | RCSID("$OpenBSD: session.c,v 1.191 2005/12/24 02:27:41 djm Exp $"); |
3c0ef626 | 37 | |
38 | #include "ssh.h" | |
39 | #include "ssh1.h" | |
40 | #include "ssh2.h" | |
41 | #include "xmalloc.h" | |
42 | #include "sshpty.h" | |
43 | #include "packet.h" | |
44 | #include "buffer.h" | |
7e82606e | 45 | #include "match.h" |
3c0ef626 | 46 | #include "uidswap.h" |
47 | #include "compat.h" | |
48 | #include "channels.h" | |
49 | #include "bufaux.h" | |
50 | #include "auth.h" | |
51 | #include "auth-options.h" | |
52 | #include "pathnames.h" | |
53 | #include "log.h" | |
54 | #include "servconf.h" | |
55 | #include "sshlogin.h" | |
56 | #include "serverloop.h" | |
57 | #include "canohost.h" | |
58 | #include "session.h" | |
2ce0bfe4 | 59 | #include "kex.h" |
350391c5 | 60 | #include "monitor_wrap.h" |
3c0ef626 | 61 | |
540d72c3 | 62 | #if defined(KRB5) && defined(USE_AFS) |
63 | #include <kafs.h> | |
64 | #endif | |
65 | ||
5598e598 | 66 | #ifdef GSSAPI |
67 | #include "ssh-gss.h" | |
68 | #endif | |
69 | ||
3c0ef626 | 70 | /* func */ |
71 | ||
72 | Session *session_new(void); | |
73 | void session_set_fds(Session *, int, int, int); | |
540d72c3 | 74 | void session_pty_cleanup(Session *); |
3c0ef626 | 75 | void session_proctitle(Session *); |
76 | int session_setup_x11fwd(Session *); | |
77 | void do_exec_pty(Session *, const char *); | |
78 | void do_exec_no_pty(Session *, const char *); | |
79 | void do_exec(Session *, const char *); | |
80 | void do_login(Session *, const char *); | |
81 | #ifdef LOGIN_NEEDS_UTMPX | |
82 | static void do_pre_login(Session *s); | |
83 | #endif | |
84 | void do_child(Session *, const char *); | |
85 | void do_motd(void); | |
86 | int check_quietlogin(Session *, const char *); | |
87 | ||
88 | static void do_authenticated1(Authctxt *); | |
89 | static void do_authenticated2(Authctxt *); | |
90 | ||
3c0ef626 | 91 | static int session_pty_req(Session *); |
92 | ||
75be3237 | 93 | #ifdef SESSION_HOOKS |
94 | static void execute_session_hook(char* prog, Authctxt *authctxt, | |
95 | int startup, int save); | |
96 | #endif | |
97 | ||
3c0ef626 | 98 | /* import */ |
99 | extern ServerOptions options; | |
100 | extern char *__progname; | |
101 | extern int log_stderr; | |
102 | extern int debug_flag; | |
103 | extern u_int utmp_len; | |
104 | extern int startup_pipe; | |
105 | extern void destroy_sensitive_data(void); | |
7cac2b65 | 106 | extern Buffer loginmsg; |
3c0ef626 | 107 | |
108 | /* original command from peer. */ | |
109 | const char *original_command = NULL; | |
110 | ||
111 | /* data */ | |
112 | #define MAX_SESSIONS 10 | |
113 | Session sessions[MAX_SESSIONS]; | |
114 | ||
3c0ef626 | 115 | #ifdef HAVE_LOGIN_CAP |
350391c5 | 116 | login_cap_t *lc; |
3c0ef626 | 117 | #endif |
118 | ||
540d72c3 | 119 | static int is_child = 0; |
120 | ||
44a053a3 | 121 | /* Name and directory of socket for authentication agent forwarding. */ |
122 | static char *auth_sock_name = NULL; | |
123 | static char *auth_sock_dir = NULL; | |
124 | ||
125 | /* removes the agent forwarding socket */ | |
126 | ||
127 | static void | |
540d72c3 | 128 | auth_sock_cleanup_proc(struct passwd *pw) |
44a053a3 | 129 | { |
44a053a3 | 130 | if (auth_sock_name != NULL) { |
131 | temporarily_use_uid(pw); | |
132 | unlink(auth_sock_name); | |
133 | rmdir(auth_sock_dir); | |
134 | auth_sock_name = NULL; | |
135 | restore_uid(); | |
136 | } | |
137 | } | |
138 | ||
139 | static int | |
140 | auth_input_request_forwarding(struct passwd * pw) | |
141 | { | |
142 | Channel *nc; | |
143 | int sock; | |
144 | struct sockaddr_un sunaddr; | |
145 | ||
146 | if (auth_sock_name != NULL) { | |
147 | error("authentication forwarding requested twice."); | |
148 | return 0; | |
149 | } | |
150 | ||
151 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
152 | temporarily_use_uid(pw); | |
153 | ||
154 | /* Allocate a buffer for the socket name, and format the name. */ | |
155 | auth_sock_name = xmalloc(MAXPATHLEN); | |
156 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
540d72c3 | 157 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
44a053a3 | 158 | |
159 | /* Create private directory for socket */ | |
160 | if (mkdtemp(auth_sock_dir) == NULL) { | |
161 | packet_send_debug("Agent forwarding disabled: " | |
162 | "mkdtemp() failed: %.100s", strerror(errno)); | |
163 | restore_uid(); | |
164 | xfree(auth_sock_name); | |
165 | xfree(auth_sock_dir); | |
166 | auth_sock_name = NULL; | |
167 | auth_sock_dir = NULL; | |
168 | return 0; | |
169 | } | |
170 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", | |
171 | auth_sock_dir, (long) getpid()); | |
172 | ||
44a053a3 | 173 | /* Create the socket. */ |
174 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
175 | if (sock < 0) | |
176 | packet_disconnect("socket: %.100s", strerror(errno)); | |
177 | ||
178 | /* Bind it to the name. */ | |
179 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
180 | sunaddr.sun_family = AF_UNIX; | |
181 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
182 | ||
183 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
184 | packet_disconnect("bind: %.100s", strerror(errno)); | |
185 | ||
186 | /* Restore the privileged uid. */ | |
187 | restore_uid(); | |
188 | ||
189 | /* Start listening on the socket. */ | |
540d72c3 | 190 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
44a053a3 | 191 | packet_disconnect("listen: %.100s", strerror(errno)); |
192 | ||
193 | /* Allocate a channel for the authentication agent socket. */ | |
194 | nc = channel_new("auth socket", | |
195 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
196 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
7cac2b65 | 197 | 0, "auth socket", 1); |
44a053a3 | 198 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
199 | return 1; | |
200 | } | |
201 | ||
540d72c3 | 202 | static void |
203 | display_loginmsg(void) | |
204 | { | |
2ce0bfe4 | 205 | if (buffer_len(&loginmsg) > 0) { |
206 | buffer_append(&loginmsg, "\0", 1); | |
207 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
208 | buffer_clear(&loginmsg); | |
209 | } | |
540d72c3 | 210 | } |
44a053a3 | 211 | |
3c0ef626 | 212 | void |
213 | do_authenticated(Authctxt *authctxt) | |
214 | { | |
bfe49944 | 215 | setproctitle("%s", authctxt->pw->pw_name); |
216 | ||
3c0ef626 | 217 | /* setup the channel layer */ |
218 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
219 | channel_permit_all_opens(); | |
220 | ||
221 | if (compat20) | |
222 | do_authenticated2(authctxt); | |
223 | else | |
224 | do_authenticated1(authctxt); | |
225 | ||
75be3237 | 226 | #ifdef SESSION_HOOKS |
227 | if (options.session_hooks_allow && | |
228 | options.session_hooks_shutdown_cmd) | |
229 | { | |
230 | execute_session_hook(options.session_hooks_shutdown_cmd, | |
231 | authctxt, | |
232 | /* startup = */ 0, /* save = */ 0); | |
233 | ||
234 | if (authctxt->session_env_file) | |
235 | { | |
236 | free(authctxt->session_env_file); | |
237 | } | |
238 | } | |
239 | #endif | |
540d72c3 | 240 | |
241 | do_cleanup(authctxt); | |
3c0ef626 | 242 | } |
243 | ||
244 | /* | |
245 | * Prepares for an interactive session. This is called after the user has | |
246 | * been successfully authenticated. During this message exchange, pseudo | |
247 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
248 | * are requested, etc. | |
249 | */ | |
250 | static void | |
251 | do_authenticated1(Authctxt *authctxt) | |
252 | { | |
253 | Session *s; | |
254 | char *command; | |
e9702f7d | 255 | int success, type, screen_flag; |
276b07a3 | 256 | int enable_compression_after_reply = 0; |
257 | u_int proto_len, data_len, dlen, compression_level = 0; | |
3c0ef626 | 258 | |
259 | s = session_new(); | |
dfddba3d | 260 | if (s == NULL) { |
261 | error("no more sessions"); | |
262 | return; | |
263 | } | |
3c0ef626 | 264 | s->authctxt = authctxt; |
265 | s->pw = authctxt->pw; | |
266 | ||
267 | /* | |
268 | * We stay in this loop until the client requests to execute a shell | |
269 | * or a command. | |
270 | */ | |
271 | for (;;) { | |
272 | success = 0; | |
273 | ||
274 | /* Get a packet from the client. */ | |
e9702f7d | 275 | type = packet_read(); |
3c0ef626 | 276 | |
277 | /* Process the packet. */ | |
278 | switch (type) { | |
279 | case SSH_CMSG_REQUEST_COMPRESSION: | |
3c0ef626 | 280 | compression_level = packet_get_int(); |
e9702f7d | 281 | packet_check_eom(); |
3c0ef626 | 282 | if (compression_level < 1 || compression_level > 9) { |
7e82606e | 283 | packet_send_debug("Received invalid compression level %d.", |
e9702f7d | 284 | compression_level); |
3c0ef626 | 285 | break; |
286 | } | |
2ce0bfe4 | 287 | if (options.compression == COMP_NONE) { |
44a053a3 | 288 | debug2("compression disabled"); |
289 | break; | |
290 | } | |
3c0ef626 | 291 | /* Enable compression after we have responded with SUCCESS. */ |
292 | enable_compression_after_reply = 1; | |
293 | success = 1; | |
294 | break; | |
295 | ||
296 | case SSH_CMSG_REQUEST_PTY: | |
297 | success = session_pty_req(s); | |
298 | break; | |
299 | ||
300 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
301 | s->auth_proto = packet_get_string(&proto_len); | |
302 | s->auth_data = packet_get_string(&data_len); | |
303 | ||
304 | screen_flag = packet_get_protocol_flags() & | |
305 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
306 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
307 | ||
308 | if (packet_remaining() == 4) { | |
309 | if (!screen_flag) | |
310 | debug2("Buggy client: " | |
311 | "X11 screen flag missing"); | |
312 | s->screen = packet_get_int(); | |
313 | } else { | |
314 | s->screen = 0; | |
315 | } | |
e9702f7d | 316 | packet_check_eom(); |
3c0ef626 | 317 | success = session_setup_x11fwd(s); |
318 | if (!success) { | |
319 | xfree(s->auth_proto); | |
320 | xfree(s->auth_data); | |
321 | s->auth_proto = NULL; | |
322 | s->auth_data = NULL; | |
323 | } | |
324 | break; | |
325 | ||
326 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
327 | if (no_agent_forwarding_flag || compat13) { | |
328 | debug("Authentication agent forwarding not permitted for this authentication."); | |
329 | break; | |
330 | } | |
331 | debug("Received authentication agent forwarding request."); | |
332 | success = auth_input_request_forwarding(s->pw); | |
333 | break; | |
334 | ||
335 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
336 | if (no_port_forwarding_flag) { | |
337 | debug("Port forwarding not permitted for this authentication."); | |
338 | break; | |
339 | } | |
340 | if (!options.allow_tcp_forwarding) { | |
341 | debug("Port forwarding not permitted."); | |
342 | break; | |
343 | } | |
344 | debug("Received TCP/IP port forwarding request."); | |
345 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); | |
346 | success = 1; | |
347 | break; | |
348 | ||
349 | case SSH_CMSG_MAX_PACKET_SIZE: | |
350 | if (packet_set_maxsize(packet_get_int()) > 0) | |
351 | success = 1; | |
352 | break; | |
e9702f7d | 353 | |
3c0ef626 | 354 | case SSH_CMSG_EXEC_SHELL: |
355 | case SSH_CMSG_EXEC_CMD: | |
356 | if (type == SSH_CMSG_EXEC_CMD) { | |
357 | command = packet_get_string(&dlen); | |
358 | debug("Exec command '%.500s'", command); | |
359 | do_exec(s, command); | |
360 | xfree(command); | |
361 | } else { | |
362 | do_exec(s, NULL); | |
363 | } | |
e9702f7d | 364 | packet_check_eom(); |
3c0ef626 | 365 | session_close(s); |
366 | return; | |
367 | ||
368 | default: | |
369 | /* | |
370 | * Any unknown messages in this phase are ignored, | |
371 | * and a failure message is returned. | |
372 | */ | |
7cac2b65 | 373 | logit("Unknown packet type received after authentication: %d", type); |
3c0ef626 | 374 | } |
375 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
376 | packet_send(); | |
377 | packet_write_wait(); | |
378 | ||
379 | /* Enable compression now that we have replied if appropriate. */ | |
380 | if (enable_compression_after_reply) { | |
381 | enable_compression_after_reply = 0; | |
382 | packet_start_compression(compression_level); | |
383 | } | |
384 | } | |
385 | } | |
386 | ||
387 | /* | |
388 | * This is called to fork and execute a command when we have no tty. This | |
389 | * will call do_child from the child, and server_loop from the parent after | |
390 | * setting up file descriptors and such. | |
391 | */ | |
392 | void | |
393 | do_exec_no_pty(Session *s, const char *command) | |
394 | { | |
44a053a3 | 395 | pid_t pid; |
3c0ef626 | 396 | |
397 | #ifdef USE_PIPES | |
398 | int pin[2], pout[2], perr[2]; | |
399 | /* Allocate pipes for communicating with the program. */ | |
400 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
401 | packet_disconnect("Could not create pipes: %.100s", | |
402 | strerror(errno)); | |
403 | #else /* USE_PIPES */ | |
404 | int inout[2], err[2]; | |
405 | /* Uses socket pairs to communicate with the program. */ | |
406 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
407 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
408 | packet_disconnect("Could not create socket pairs: %.100s", | |
409 | strerror(errno)); | |
410 | #endif /* USE_PIPES */ | |
411 | if (s == NULL) | |
412 | fatal("do_exec_no_pty: no session"); | |
413 | ||
414 | session_proctitle(s); | |
415 | ||
416 | #if defined(USE_PAM) | |
540d72c3 | 417 | if (options.use_pam && !use_privsep) |
7cac2b65 | 418 | do_pam_setcred(1); |
3c0ef626 | 419 | #endif /* USE_PAM */ |
420 | ||
421 | /* Fork the child. */ | |
422 | if ((pid = fork()) == 0) { | |
540d72c3 | 423 | is_child = 1; |
d03f4262 | 424 | |
3c0ef626 | 425 | /* Child. Reinitialize the log since the pid has changed. */ |
426 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
427 | ||
428 | /* | |
429 | * Create a new session and process group since the 4.4BSD | |
430 | * setlogin() affects the entire process group. | |
431 | */ | |
432 | if (setsid() < 0) | |
433 | error("setsid failed: %.100s", strerror(errno)); | |
434 | ||
435 | #ifdef USE_PIPES | |
436 | /* | |
437 | * Redirect stdin. We close the parent side of the socket | |
438 | * pair, and make the child side the standard input. | |
439 | */ | |
440 | close(pin[1]); | |
441 | if (dup2(pin[0], 0) < 0) | |
442 | perror("dup2 stdin"); | |
443 | close(pin[0]); | |
444 | ||
445 | /* Redirect stdout. */ | |
446 | close(pout[0]); | |
447 | if (dup2(pout[1], 1) < 0) | |
448 | perror("dup2 stdout"); | |
449 | close(pout[1]); | |
450 | ||
451 | /* Redirect stderr. */ | |
452 | close(perr[0]); | |
453 | if (dup2(perr[1], 2) < 0) | |
454 | perror("dup2 stderr"); | |
455 | close(perr[1]); | |
456 | #else /* USE_PIPES */ | |
457 | /* | |
458 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
459 | * use the same socket, as some programs (particularly rdist) | |
460 | * seem to depend on it. | |
461 | */ | |
462 | close(inout[1]); | |
463 | close(err[1]); | |
464 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
465 | perror("dup2 stdin"); | |
466 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
467 | perror("dup2 stdout"); | |
468 | if (dup2(err[0], 2) < 0) /* stderr */ | |
469 | perror("dup2 stderr"); | |
470 | #endif /* USE_PIPES */ | |
471 | ||
d03f4262 | 472 | #ifdef _UNICOS |
473 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
474 | #endif | |
475 | ||
3c0ef626 | 476 | /* Do processing for the child (exec command etc). */ |
477 | do_child(s, command); | |
478 | /* NOTREACHED */ | |
479 | } | |
d03f4262 | 480 | #ifdef _UNICOS |
481 | signal(WJSIGNAL, cray_job_termination_handler); | |
482 | #endif /* _UNICOS */ | |
3c0ef626 | 483 | #ifdef HAVE_CYGWIN |
484 | if (is_winnt) | |
485 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
486 | #endif | |
487 | if (pid < 0) | |
488 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
489 | s->pid = pid; | |
490 | /* Set interactive/non-interactive mode. */ | |
491 | packet_set_interactive(s->display != NULL); | |
492 | #ifdef USE_PIPES | |
493 | /* We are the parent. Close the child sides of the pipes. */ | |
494 | close(pin[0]); | |
495 | close(pout[1]); | |
496 | close(perr[1]); | |
497 | ||
498 | if (compat20) { | |
7e82606e | 499 | if (s->is_subsystem) { |
500 | close(perr[0]); | |
501 | perr[0] = -1; | |
502 | } | |
503 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
3c0ef626 | 504 | } else { |
505 | /* Enter the interactive session. */ | |
506 | server_loop(pid, pin[1], pout[0], perr[0]); | |
507 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ | |
508 | } | |
509 | #else /* USE_PIPES */ | |
510 | /* We are the parent. Close the child sides of the socket pairs. */ | |
511 | close(inout[0]); | |
512 | close(err[0]); | |
513 | ||
12a403af | 514 | /* |
515 | * Clear loginmsg, since it's the child's responsibility to display | |
516 | * it to the user, otherwise multiple sessions may accumulate | |
517 | * multiple copies of the login messages. | |
518 | */ | |
519 | buffer_clear(&loginmsg); | |
520 | ||
3c0ef626 | 521 | /* |
522 | * Enter the interactive session. Note: server_loop must be able to | |
523 | * handle the case that fdin and fdout are the same. | |
524 | */ | |
525 | if (compat20) { | |
526 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); | |
527 | } else { | |
528 | server_loop(pid, inout[1], inout[1], err[1]); | |
529 | /* server_loop has closed inout[1] and err[1]. */ | |
530 | } | |
531 | #endif /* USE_PIPES */ | |
532 | } | |
533 | ||
534 | /* | |
535 | * This is called to fork and execute a command when we have a tty. This | |
536 | * will call do_child from the child, and server_loop from the parent after | |
537 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
538 | * lastlog, and other such operations. | |
539 | */ | |
540 | void | |
541 | do_exec_pty(Session *s, const char *command) | |
542 | { | |
543 | int fdout, ptyfd, ttyfd, ptymaster; | |
544 | pid_t pid; | |
545 | ||
546 | if (s == NULL) | |
547 | fatal("do_exec_pty: no session"); | |
548 | ptyfd = s->ptyfd; | |
549 | ttyfd = s->ttyfd; | |
550 | ||
551 | #if defined(USE_PAM) | |
7cac2b65 | 552 | if (options.use_pam) { |
553 | do_pam_set_tty(s->tty); | |
540d72c3 | 554 | if (!use_privsep) |
555 | do_pam_setcred(1); | |
7cac2b65 | 556 | } |
3c0ef626 | 557 | #endif |
558 | ||
559 | /* Fork the child. */ | |
560 | if ((pid = fork()) == 0) { | |
540d72c3 | 561 | is_child = 1; |
3c0ef626 | 562 | |
563 | /* Child. Reinitialize the log because the pid has changed. */ | |
564 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
565 | /* Close the master side of the pseudo tty. */ | |
566 | close(ptyfd); | |
567 | ||
568 | /* Make the pseudo tty our controlling tty. */ | |
569 | pty_make_controlling_tty(&ttyfd, s->tty); | |
570 | ||
571 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ | |
572 | if (dup2(ttyfd, 0) < 0) | |
573 | error("dup2 stdin: %s", strerror(errno)); | |
574 | if (dup2(ttyfd, 1) < 0) | |
575 | error("dup2 stdout: %s", strerror(errno)); | |
576 | if (dup2(ttyfd, 2) < 0) | |
577 | error("dup2 stderr: %s", strerror(errno)); | |
578 | ||
579 | /* Close the extra descriptor for the pseudo tty. */ | |
580 | close(ttyfd); | |
581 | ||
582 | /* record login, etc. similar to login(1) */ | |
583 | #ifndef HAVE_OSF_SIA | |
d03f4262 | 584 | if (!(options.use_login && command == NULL)) { |
585 | #ifdef _UNICOS | |
586 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
587 | #endif /* _UNICOS */ | |
3c0ef626 | 588 | do_login(s, command); |
d03f4262 | 589 | } |
3c0ef626 | 590 | # ifdef LOGIN_NEEDS_UTMPX |
591 | else | |
592 | do_pre_login(s); | |
593 | # endif | |
594 | #endif | |
595 | ||
596 | /* Do common processing for the child, such as execing the command. */ | |
597 | do_child(s, command); | |
598 | /* NOTREACHED */ | |
599 | } | |
d03f4262 | 600 | #ifdef _UNICOS |
601 | signal(WJSIGNAL, cray_job_termination_handler); | |
602 | #endif /* _UNICOS */ | |
3c0ef626 | 603 | #ifdef HAVE_CYGWIN |
604 | if (is_winnt) | |
605 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
606 | #endif | |
607 | if (pid < 0) | |
608 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
609 | s->pid = pid; | |
610 | ||
611 | /* Parent. Close the slave side of the pseudo tty. */ | |
612 | close(ttyfd); | |
613 | ||
614 | /* | |
615 | * Create another descriptor of the pty master side for use as the | |
616 | * standard input. We could use the original descriptor, but this | |
617 | * simplifies code in server_loop. The descriptor is bidirectional. | |
618 | */ | |
619 | fdout = dup(ptyfd); | |
620 | if (fdout < 0) | |
621 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
622 | ||
623 | /* we keep a reference to the pty master */ | |
624 | ptymaster = dup(ptyfd); | |
625 | if (ptymaster < 0) | |
626 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
627 | s->ptymaster = ptymaster; | |
628 | ||
629 | /* Enter interactive session. */ | |
630 | packet_set_interactive(1); | |
631 | if (compat20) { | |
632 | session_set_fds(s, ptyfd, fdout, -1); | |
633 | } else { | |
634 | server_loop(pid, ptyfd, fdout, -1); | |
635 | /* server_loop _has_ closed ptyfd and fdout. */ | |
636 | } | |
637 | } | |
638 | ||
639 | #ifdef LOGIN_NEEDS_UTMPX | |
640 | static void | |
641 | do_pre_login(Session *s) | |
642 | { | |
643 | socklen_t fromlen; | |
644 | struct sockaddr_storage from; | |
645 | pid_t pid = getpid(); | |
646 | ||
647 | /* | |
648 | * Get IP address of client. If the connection is not a socket, let | |
649 | * the address be 0.0.0.0. | |
650 | */ | |
651 | memset(&from, 0, sizeof(from)); | |
d03f4262 | 652 | fromlen = sizeof(from); |
3c0ef626 | 653 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 654 | if (getpeername(packet_get_connection_in(), |
e9702f7d | 655 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 656 | debug("getpeername: %.100s", strerror(errno)); |
540d72c3 | 657 | cleanup_exit(255); |
3c0ef626 | 658 | } |
659 | } | |
660 | ||
661 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
7cac2b65 | 662 | get_remote_name_or_ip(utmp_len, options.use_dns), |
bfe49944 | 663 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 664 | } |
665 | #endif | |
666 | ||
667 | /* | |
668 | * This is called to fork and execute a command. If another command is | |
669 | * to be forced, execute that instead. | |
670 | */ | |
671 | void | |
672 | do_exec(Session *s, const char *command) | |
673 | { | |
674 | if (forced_command) { | |
675 | original_command = command; | |
676 | command = forced_command; | |
677 | debug("Forced command '%.900s'", command); | |
678 | } | |
679 | ||
7cac2b65 | 680 | #if defined(SESSION_HOOKS) |
681 | if (options.session_hooks_allow && | |
682 | (options.session_hooks_startup_cmd || | |
683 | options.session_hooks_shutdown_cmd)) | |
684 | { | |
685 | char env_file[1000]; | |
686 | struct stat st; | |
687 | do | |
688 | { | |
689 | snprintf(env_file, | |
690 | sizeof(env_file), | |
691 | "/tmp/ssh_env_%d%d%d", | |
692 | getuid(), | |
693 | getpid(), | |
694 | rand()); | |
695 | } while (stat(env_file, &st)==0); | |
696 | s->authctxt->session_env_file = strdup(env_file); | |
697 | } | |
698 | #endif | |
699 | ||
dfddba3d | 700 | #ifdef SSH_AUDIT_EVENTS |
701 | if (command != NULL) | |
702 | PRIVSEP(audit_run_command(command)); | |
703 | else if (s->ttyfd == -1) { | |
704 | char *shell = s->pw->pw_shell; | |
705 | ||
706 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
707 | shell =_PATH_BSHELL; | |
708 | PRIVSEP(audit_run_command(shell)); | |
709 | } | |
710 | #endif | |
711 | ||
3c0ef626 | 712 | if (s->ttyfd != -1) |
713 | do_exec_pty(s, command); | |
714 | else | |
715 | do_exec_no_pty(s, command); | |
716 | ||
717 | original_command = NULL; | |
3c0ef626 | 718 | |
7e82606e | 719 | /* |
720 | * Clear loginmsg: it's the child's responsibility to display | |
721 | * it to the user, otherwise multiple sessions may accumulate | |
722 | * multiple copies of the login messages. | |
723 | */ | |
724 | buffer_clear(&loginmsg); | |
725 | } | |
e9702f7d | 726 | |
3c0ef626 | 727 | /* administrative, login(1)-like work */ |
728 | void | |
729 | do_login(Session *s, const char *command) | |
730 | { | |
3c0ef626 | 731 | socklen_t fromlen; |
732 | struct sockaddr_storage from; | |
3c0ef626 | 733 | struct passwd * pw = s->pw; |
734 | pid_t pid = getpid(); | |
735 | ||
736 | /* | |
737 | * Get IP address of client. If the connection is not a socket, let | |
738 | * the address be 0.0.0.0. | |
739 | */ | |
740 | memset(&from, 0, sizeof(from)); | |
bfe49944 | 741 | fromlen = sizeof(from); |
3c0ef626 | 742 | if (packet_connection_is_on_socket()) { |
3c0ef626 | 743 | if (getpeername(packet_get_connection_in(), |
e9702f7d | 744 | (struct sockaddr *) & from, &fromlen) < 0) { |
3c0ef626 | 745 | debug("getpeername: %.100s", strerror(errno)); |
540d72c3 | 746 | cleanup_exit(255); |
3c0ef626 | 747 | } |
748 | } | |
749 | ||
3c0ef626 | 750 | /* Record that there was a login on that tty from the remote host. */ |
350391c5 | 751 | if (!use_privsep) |
752 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
753 | get_remote_name_or_ip(utmp_len, | |
7cac2b65 | 754 | options.use_dns), |
d03f4262 | 755 | (struct sockaddr *)&from, fromlen); |
3c0ef626 | 756 | |
757 | #ifdef USE_PAM | |
758 | /* | |
759 | * If password change is needed, do it now. | |
760 | * This needs to occur before the ~/.hushlogin check. | |
761 | */ | |
540d72c3 | 762 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
763 | display_loginmsg(); | |
3c0ef626 | 764 | do_pam_chauthtok(); |
540d72c3 | 765 | s->authctxt->force_pwchange = 0; |
7cac2b65 | 766 | /* XXX - signal [net] parent to enable forwardings */ |
3c0ef626 | 767 | } |
768 | #endif | |
769 | ||
770 | if (check_quietlogin(s, command)) | |
771 | return; | |
772 | ||
540d72c3 | 773 | display_loginmsg(); |
3c0ef626 | 774 | |
3c0ef626 | 775 | do_motd(); |
776 | } | |
777 | ||
778 | /* | |
779 | * Display the message of the day. | |
780 | */ | |
781 | void | |
782 | do_motd(void) | |
783 | { | |
784 | FILE *f; | |
785 | char buf[256]; | |
786 | ||
787 | if (options.print_motd) { | |
788 | #ifdef HAVE_LOGIN_CAP | |
789 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
790 | "/etc/motd"), "r"); | |
791 | #else | |
792 | f = fopen("/etc/motd", "r"); | |
793 | #endif | |
794 | if (f) { | |
795 | while (fgets(buf, sizeof(buf), f)) | |
796 | fputs(buf, stdout); | |
797 | fclose(f); | |
798 | } | |
799 | } | |
800 | } | |
801 | ||
802 | ||
803 | /* | |
804 | * Check for quiet login, either .hushlogin or command given. | |
805 | */ | |
806 | int | |
807 | check_quietlogin(Session *s, const char *command) | |
808 | { | |
809 | char buf[256]; | |
810 | struct passwd *pw = s->pw; | |
811 | struct stat st; | |
812 | ||
813 | /* Return 1 if .hushlogin exists or a command given. */ | |
814 | if (command != NULL) | |
815 | return 1; | |
816 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
817 | #ifdef HAVE_LOGIN_CAP | |
818 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
819 | return 1; | |
820 | #else | |
821 | if (stat(buf, &st) >= 0) | |
822 | return 1; | |
823 | #endif | |
824 | return 0; | |
825 | } | |
826 | ||
827 | /* | |
828 | * Sets the value of the given variable in the environment. If the variable | |
829 | * already exists, its value is overriden. | |
830 | */ | |
5598e598 | 831 | void |
3c0ef626 | 832 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
e9702f7d | 833 | const char *value) |
3c0ef626 | 834 | { |
3c0ef626 | 835 | char **env; |
29d88157 | 836 | u_int envsize; |
837 | u_int i, namelen; | |
3c0ef626 | 838 | |
7cac2b65 | 839 | /* |
840 | * If we're passed an uninitialized list, allocate a single null | |
841 | * entry before continuing. | |
842 | */ | |
843 | if (*envp == NULL && *envsizep == 0) { | |
844 | *envp = xmalloc(sizeof(char *)); | |
845 | *envp[0] = NULL; | |
846 | *envsizep = 1; | |
847 | } | |
848 | ||
3c0ef626 | 849 | /* |
850 | * Find the slot where the value should be stored. If the variable | |
851 | * already exists, we reuse the slot; otherwise we append a new slot | |
852 | * at the end of the array, expanding if necessary. | |
853 | */ | |
854 | env = *envp; | |
855 | namelen = strlen(name); | |
856 | for (i = 0; env[i]; i++) | |
857 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
858 | break; | |
859 | if (env[i]) { | |
860 | /* Reuse the slot. */ | |
861 | xfree(env[i]); | |
862 | } else { | |
863 | /* New variable. Expand if necessary. */ | |
29d88157 | 864 | envsize = *envsizep; |
865 | if (i >= envsize - 1) { | |
866 | if (envsize >= 1000) | |
867 | fatal("child_set_env: too many env vars"); | |
868 | envsize += 50; | |
869 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); | |
870 | *envsizep = envsize; | |
3c0ef626 | 871 | } |
872 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
873 | env[i + 1] = NULL; | |
874 | } | |
875 | ||
876 | /* Allocate space and format the variable in the appropriate slot. */ | |
877 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
878 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
879 | } | |
880 | ||
881 | /* | |
882 | * Reads environment variables from the given file and adds/overrides them | |
883 | * into the environment. If the file does not exist, this does nothing. | |
884 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
885 | * and assignments of the form name=value. No other forms are allowed. | |
886 | */ | |
887 | static void | |
888 | read_environment_file(char ***env, u_int *envsize, | |
e9702f7d | 889 | const char *filename) |
3c0ef626 | 890 | { |
891 | FILE *f; | |
892 | char buf[4096]; | |
893 | char *cp, *value; | |
276b07a3 | 894 | u_int lineno = 0; |
3c0ef626 | 895 | |
896 | f = fopen(filename, "r"); | |
897 | if (!f) | |
898 | return; | |
899 | ||
900 | while (fgets(buf, sizeof(buf), f)) { | |
276b07a3 | 901 | if (++lineno > 1000) |
902 | fatal("Too many lines in environment file %s", filename); | |
3c0ef626 | 903 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
904 | ; | |
905 | if (!*cp || *cp == '#' || *cp == '\n') | |
906 | continue; | |
907 | if (strchr(cp, '\n')) | |
908 | *strchr(cp, '\n') = '\0'; | |
909 | value = strchr(cp, '='); | |
910 | if (value == NULL) { | |
276b07a3 | 911 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
912 | filename); | |
3c0ef626 | 913 | continue; |
914 | } | |
915 | /* | |
916 | * Replace the equals sign by nul, and advance value to | |
917 | * the value string. | |
918 | */ | |
919 | *value = '\0'; | |
920 | value++; | |
921 | child_set_env(env, envsize, cp, value); | |
922 | } | |
923 | fclose(f); | |
924 | } | |
925 | ||
75be3237 | 926 | #ifdef SESSION_HOOKS |
927 | #define SSH_SESSION_ENV_FILE "SSH_SESSION_ENV_FILE" | |
928 | ||
929 | typedef enum { no_op, execute, clear_env, restore_env, | |
930 | read_env, save_or_rm_env } session_action_t; | |
931 | ||
932 | static session_action_t action_order[2][5] = { | |
933 | { clear_env, read_env, execute, save_or_rm_env, restore_env }, /*shutdown*/ | |
934 | { execute, read_env, save_or_rm_env, no_op, no_op } /*startup */ | |
935 | }; | |
936 | ||
937 | static | |
938 | void execute_session_hook(char* prog, Authctxt *authctxt, | |
939 | int startup, int save) | |
940 | { | |
941 | extern char **environ; | |
942 | ||
943 | struct stat st; | |
944 | char **saved_env, **tmpenv; | |
945 | char *env_file = authctxt->session_env_file; | |
946 | int i, status = 0; | |
947 | ||
948 | for (i=0; i<5; i++) | |
949 | { | |
950 | switch (action_order[startup][i]) | |
951 | { | |
952 | case no_op: | |
953 | break; | |
954 | ||
955 | case execute: | |
956 | { | |
957 | FILE* fp; | |
958 | char buf[1000]; | |
959 | ||
960 | snprintf(buf, | |
961 | sizeof(buf), | |
962 | "%s -c '%s'", | |
963 | authctxt->pw->pw_shell, | |
964 | prog); | |
965 | ||
966 | debug("executing session hook: [%s]", buf); | |
967 | setenv(SSH_SESSION_ENV_FILE, env_file, /* overwrite = */ 1); | |
968 | ||
969 | /* flusing is recommended in the popen(3) man page, to avoid | |
970 | intermingling of output */ | |
971 | fflush(stdout); | |
972 | fflush(stderr); | |
973 | if ((fp=popen(buf, "w")) == NULL) | |
974 | { | |
975 | perror("Unable to run session hook"); | |
976 | return; | |
977 | } | |
978 | status = pclose(fp); | |
979 | debug2("session hook executed, status=%d", status); | |
980 | unsetenv(SSH_SESSION_ENV_FILE); | |
981 | } | |
982 | break; | |
983 | ||
984 | case clear_env: | |
985 | saved_env = environ; | |
986 | tmpenv = (char**) malloc(sizeof(char*)); | |
987 | tmpenv[0] = NULL; | |
988 | environ = tmpenv; | |
989 | break; | |
990 | ||
991 | case restore_env: | |
992 | environ = saved_env; | |
993 | free(tmpenv); | |
994 | break; | |
995 | ||
996 | case read_env: | |
997 | if (status==0 && stat(env_file, &st)==0) | |
998 | { | |
999 | int envsize = 0; | |
1000 | ||
1001 | debug("reading environment from %s", env_file); | |
1002 | while (environ[envsize++]) ; | |
1003 | read_environment_file(&environ, &envsize, env_file); | |
1004 | } | |
1005 | break; | |
1006 | ||
1007 | case save_or_rm_env: | |
1008 | if (status==0 && save) | |
1009 | { | |
1010 | FILE* fp; | |
1011 | int envcount=0; | |
1012 | ||
1013 | debug2("saving environment to %s", env_file); | |
1014 | if ((fp = fopen(env_file, "w")) == NULL) /* hmm: file perms? */ | |
1015 | { | |
1016 | perror("Unable to save session hook info"); | |
1017 | } | |
1018 | while (environ[envcount]) | |
1019 | { | |
1020 | fprintf(fp, "%s\n", environ[envcount++]); | |
1021 | } | |
1022 | fflush(fp); | |
1023 | fclose(fp); | |
1024 | } | |
1025 | else if (stat(env_file, &st)==0) | |
1026 | { | |
1027 | debug2("removing environment file %s", env_file); | |
1028 | remove(env_file); | |
1029 | } | |
1030 | break; | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | } | |
1035 | #endif | |
1036 | ||
7cac2b65 | 1037 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
1038 | /* | |
1039 | * Return named variable from specified environment, or NULL if not present. | |
1040 | */ | |
1041 | static char * | |
1042 | child_get_env(char **env, const char *name) | |
1043 | { | |
1044 | int i; | |
1045 | size_t len; | |
1046 | ||
1047 | len = strlen(name); | |
1048 | for (i=0; env[i] != NULL; i++) | |
1049 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
1050 | return(env[i] + len + 1); | |
1051 | return NULL; | |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | * Read /etc/default/login. | |
1056 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
1057 | */ | |
1058 | static void | |
1059 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
1060 | { | |
1061 | char **tmpenv = NULL, *var; | |
29d88157 | 1062 | u_int i, tmpenvsize = 0; |
540d72c3 | 1063 | u_long mask; |
7cac2b65 | 1064 | |
1065 | /* | |
1066 | * We don't want to copy the whole file to the child's environment, | |
1067 | * so we use a temporary environment and copy the variables we're | |
1068 | * interested in. | |
1069 | */ | |
1070 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
1071 | ||
29d88157 | 1072 | if (tmpenv == NULL) |
1073 | return; | |
1074 | ||
7cac2b65 | 1075 | if (uid == 0) |
1076 | var = child_get_env(tmpenv, "SUPATH"); | |
1077 | else | |
1078 | var = child_get_env(tmpenv, "PATH"); | |
1079 | if (var != NULL) | |
1080 | child_set_env(env, envsize, "PATH", var); | |
540d72c3 | 1081 | |
7cac2b65 | 1082 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
1083 | if (sscanf(var, "%5lo", &mask) == 1) | |
540d72c3 | 1084 | umask((mode_t)mask); |
1085 | ||
7cac2b65 | 1086 | for (i = 0; tmpenv[i] != NULL; i++) |
1087 | xfree(tmpenv[i]); | |
1088 | xfree(tmpenv); | |
1089 | } | |
1090 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1091 | ||
2ce0bfe4 | 1092 | void |
1093 | copy_environment(char **source, char ***env, u_int *envsize) | |
3c0ef626 | 1094 | { |
e9702f7d | 1095 | char *var_name, *var_val; |
3c0ef626 | 1096 | int i; |
1097 | ||
e9702f7d | 1098 | if (source == NULL) |
3c0ef626 | 1099 | return; |
1100 | ||
e9702f7d | 1101 | for(i = 0; source[i] != NULL; i++) { |
1102 | var_name = xstrdup(source[i]); | |
1103 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
1104 | xfree(var_name); | |
3c0ef626 | 1105 | continue; |
3c0ef626 | 1106 | } |
e9702f7d | 1107 | *var_val++ = '\0'; |
3c0ef626 | 1108 | |
e9702f7d | 1109 | debug3("Copy environment: %s=%s", var_name, var_val); |
1110 | child_set_env(env, envsize, var_name, var_val); | |
540d72c3 | 1111 | |
e9702f7d | 1112 | xfree(var_name); |
3c0ef626 | 1113 | } |
3c0ef626 | 1114 | } |
1115 | ||
e9702f7d | 1116 | static char ** |
1117 | do_setup_env(Session *s, const char *shell) | |
3c0ef626 | 1118 | { |
3c0ef626 | 1119 | char buf[256]; |
e9702f7d | 1120 | u_int i, envsize; |
7cac2b65 | 1121 | char **env, *laddr, *path = NULL; |
e9702f7d | 1122 | struct passwd *pw = s->pw; |
3c0ef626 | 1123 | |
1124 | /* Initialize the environment. */ | |
1125 | envsize = 100; | |
1126 | env = xmalloc(envsize * sizeof(char *)); | |
1127 | env[0] = NULL; | |
1128 | ||
1129 | #ifdef HAVE_CYGWIN | |
1130 | /* | |
1131 | * The Windows environment contains some setting which are | |
1132 | * important for a running system. They must not be dropped. | |
1133 | */ | |
dfddba3d | 1134 | { |
1135 | char **p; | |
1136 | ||
1137 | p = fetch_windows_environment(); | |
1138 | copy_environment(p, &env, &envsize); | |
1139 | free_windows_environment(p); | |
1140 | } | |
3c0ef626 | 1141 | #endif |
1142 | ||
5598e598 | 1143 | #ifdef GSSAPI |
540d72c3 | 1144 | /* Allow any GSSAPI methods that we've used to alter |
5598e598 | 1145 | * the childs environment as they see fit |
1146 | */ | |
7cac2b65 | 1147 | ssh_gssapi_do_child(&env, &envsize); |
5598e598 | 1148 | #endif |
1149 | ||
3c0ef626 | 1150 | if (!options.use_login) { |
1151 | /* Set basic environment. */ | |
7e82606e | 1152 | for (i = 0; i < s->num_env; i++) |
1153 | child_set_env(&env, &envsize, s->env[i].name, | |
1154 | s->env[i].val); | |
1155 | ||
3c0ef626 | 1156 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1157 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
bfe49944 | 1158 | #ifdef _AIX |
1159 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1160 | #endif | |
3c0ef626 | 1161 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
1162 | #ifdef HAVE_LOGIN_CAP | |
d03f4262 | 1163 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1164 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1165 | else | |
1166 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
3c0ef626 | 1167 | #else /* HAVE_LOGIN_CAP */ |
1168 | # ifndef HAVE_CYGWIN | |
1169 | /* | |
1170 | * There's no standard path on Windows. The path contains | |
1171 | * important components pointing to the system directories, | |
1172 | * needed for loading shared libraries. So the path better | |
1173 | * remains intact here. | |
1174 | */ | |
7cac2b65 | 1175 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1176 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1177 | path = child_get_env(env, "PATH"); | |
1178 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1179 | if (path == NULL || *path == '\0') { | |
540d72c3 | 1180 | child_set_env(&env, &envsize, "PATH", |
7cac2b65 | 1181 | s->pw->pw_uid == 0 ? |
1182 | SUPERUSER_PATH : _PATH_STDPATH); | |
1183 | } | |
3c0ef626 | 1184 | # endif /* HAVE_CYGWIN */ |
1185 | #endif /* HAVE_LOGIN_CAP */ | |
1186 | ||
1187 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1188 | _PATH_MAILDIR, pw->pw_name); | |
1189 | child_set_env(&env, &envsize, "MAIL", buf); | |
1190 | ||
1191 | /* Normal systems set SHELL by default. */ | |
1192 | child_set_env(&env, &envsize, "SHELL", shell); | |
1193 | } | |
1194 | if (getenv("TZ")) | |
1195 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1196 | ||
1752c22a | 1197 | #ifdef GSI /* GSI shared libs typically installed in non-system locations. */ |
1198 | { | |
1199 | char *cp; | |
1200 | ||
1201 | if ((cp = getenv("LD_LIBRARY_PATH")) != NULL) | |
1202 | child_set_env(&env, &envsize, "LD_LIBRARY_PATH", cp); | |
1203 | if ((cp = getenv("LIBPATH")) != NULL) | |
1204 | child_set_env(&env, &envsize, "LIBPATH", cp); | |
1205 | if ((cp = getenv("SHLIB_PATH")) != NULL) | |
1206 | child_set_env(&env, &envsize, "SHLIB_PATH", cp); | |
1207 | if ((cp = getenv("LD_LIBRARYN32_PATH")) != NULL) | |
1208 | child_set_env(&env, &envsize, "LD_LIBRARYN32_PATH",cp); | |
1209 | if ((cp = getenv("LD_LIBRARY64_PATH")) != NULL) | |
1210 | child_set_env(&env, &envsize, "LD_LIBRARY64_PATH",cp); | |
1211 | } | |
1212 | #endif | |
1213 | ||
3c0ef626 | 1214 | /* Set custom environment options from RSA authentication. */ |
1215 | if (!options.use_login) { | |
1216 | while (custom_environment) { | |
1217 | struct envstring *ce = custom_environment; | |
d03f4262 | 1218 | char *str = ce->s; |
e9702f7d | 1219 | |
d03f4262 | 1220 | for (i = 0; str[i] != '=' && str[i]; i++) |
3c0ef626 | 1221 | ; |
d03f4262 | 1222 | if (str[i] == '=') { |
1223 | str[i] = 0; | |
1224 | child_set_env(&env, &envsize, str, str + i + 1); | |
3c0ef626 | 1225 | } |
1226 | custom_environment = ce->next; | |
1227 | xfree(ce->s); | |
1228 | xfree(ce); | |
1229 | } | |
1230 | } | |
1231 | ||
d03f4262 | 1232 | /* SSH_CLIENT deprecated */ |
3c0ef626 | 1233 | snprintf(buf, sizeof buf, "%.50s %d %d", |
e9702f7d | 1234 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
3c0ef626 | 1235 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1236 | ||
bfe49944 | 1237 | laddr = get_local_ipaddr(packet_get_connection_in()); |
d03f4262 | 1238 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
bfe49944 | 1239 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1240 | xfree(laddr); | |
d03f4262 | 1241 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1242 | ||
3c0ef626 | 1243 | if (s->ttyfd != -1) |
1244 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1245 | if (s->term) | |
1246 | child_set_env(&env, &envsize, "TERM", s->term); | |
1247 | if (s->display) | |
1248 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
1249 | if (original_command) | |
1250 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1251 | original_command); | |
1252 | ||
d03f4262 | 1253 | #ifdef _UNICOS |
1254 | if (cray_tmpdir[0] != '\0') | |
1255 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1256 | #endif /* _UNICOS */ | |
1257 | ||
dfddba3d | 1258 | /* |
1259 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1260 | * must have been set by a native authentication method (eg AIX or | |
1261 | * SIA), so copy it to the child. | |
1262 | */ | |
1263 | { | |
1264 | char *cp; | |
1265 | ||
1266 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1267 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1268 | } | |
1269 | ||
3c0ef626 | 1270 | #ifdef _AIX |
e9702f7d | 1271 | { |
1272 | char *cp; | |
1273 | ||
1274 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1275 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
e9702f7d | 1276 | read_environment_file(&env, &envsize, "/etc/environment"); |
1277 | } | |
3c0ef626 | 1278 | #endif |
3c0ef626 | 1279 | #ifdef KRB5 |
12a403af | 1280 | if (s->authctxt->krb5_ccname) |
3c0ef626 | 1281 | child_set_env(&env, &envsize, "KRB5CCNAME", |
12a403af | 1282 | s->authctxt->krb5_ccname); |
3c0ef626 | 1283 | #endif |
1284 | #ifdef USE_PAM | |
d03f4262 | 1285 | /* |
1286 | * Pull in any environment variables that may have | |
1287 | * been set by PAM. | |
1288 | */ | |
7cac2b65 | 1289 | if (options.use_pam) { |
540d72c3 | 1290 | char **p; |
d03f4262 | 1291 | |
540d72c3 | 1292 | p = fetch_pam_child_environment(); |
1293 | copy_environment(p, &env, &envsize); | |
1294 | free_pam_environment(p); | |
1295 | ||
1296 | p = fetch_pam_environment(); | |
d03f4262 | 1297 | copy_environment(p, &env, &envsize); |
1298 | free_pam_environment(p); | |
1299 | } | |
3c0ef626 | 1300 | #endif /* USE_PAM */ |
1301 | ||
44a053a3 | 1302 | if (auth_sock_name != NULL) |
3c0ef626 | 1303 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
44a053a3 | 1304 | auth_sock_name); |
3c0ef626 | 1305 | |
1306 | /* read $HOME/.ssh/environment. */ | |
d03f4262 | 1307 | if (options.permit_user_env && !options.use_login) { |
3c0ef626 | 1308 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
d03f4262 | 1309 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
3c0ef626 | 1310 | read_environment_file(&env, &envsize, buf); |
1311 | } | |
1312 | if (debug_flag) { | |
1313 | /* dump the environment */ | |
1314 | fprintf(stderr, "Environment:\n"); | |
1315 | for (i = 0; env[i]; i++) | |
1316 | fprintf(stderr, " %.200s\n", env[i]); | |
1317 | } | |
e9702f7d | 1318 | return env; |
1319 | } | |
1320 | ||
1321 | /* | |
1322 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1323 | * first in this order). | |
1324 | */ | |
1325 | static void | |
1326 | do_rc_files(Session *s, const char *shell) | |
1327 | { | |
1328 | FILE *f = NULL; | |
1329 | char cmd[1024]; | |
1330 | int do_xauth; | |
1331 | struct stat st; | |
1332 | ||
1333 | do_xauth = | |
1334 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1335 | ||
1336 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1337 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1338 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1339 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1340 | if (debug_flag) | |
1341 | fprintf(stderr, "Running %s\n", cmd); | |
1342 | f = popen(cmd, "w"); | |
1343 | if (f) { | |
1344 | if (do_xauth) | |
1345 | fprintf(f, "%s %s\n", s->auth_proto, | |
1346 | s->auth_data); | |
1347 | pclose(f); | |
1348 | } else | |
1349 | fprintf(stderr, "Could not run %s\n", | |
1350 | _PATH_SSH_USER_RC); | |
1351 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1352 | if (debug_flag) | |
1353 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1354 | _PATH_SSH_SYSTEM_RC); | |
1355 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1356 | if (f) { | |
1357 | if (do_xauth) | |
1358 | fprintf(f, "%s %s\n", s->auth_proto, | |
1359 | s->auth_data); | |
1360 | pclose(f); | |
1361 | } else | |
1362 | fprintf(stderr, "Could not run %s\n", | |
1363 | _PATH_SSH_SYSTEM_RC); | |
1364 | } else if (do_xauth && options.xauth_location != NULL) { | |
1365 | /* Add authority data to .Xauthority if appropriate. */ | |
1366 | if (debug_flag) { | |
1367 | fprintf(stderr, | |
bfe49944 | 1368 | "Running %.500s remove %.100s\n", |
540d72c3 | 1369 | options.xauth_location, s->auth_display); |
bfe49944 | 1370 | fprintf(stderr, |
1371 | "%.500s add %.100s %.100s %.100s\n", | |
e9702f7d | 1372 | options.xauth_location, s->auth_display, |
1373 | s->auth_proto, s->auth_data); | |
1374 | } | |
1375 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1376 | options.xauth_location); | |
1377 | f = popen(cmd, "w"); | |
1378 | if (f) { | |
bfe49944 | 1379 | fprintf(f, "remove %s\n", |
1380 | s->auth_display); | |
e9702f7d | 1381 | fprintf(f, "add %s %s %s\n", |
1382 | s->auth_display, s->auth_proto, | |
1383 | s->auth_data); | |
1384 | pclose(f); | |
1385 | } else { | |
1386 | fprintf(stderr, "Could not run %s\n", | |
1387 | cmd); | |
1388 | } | |
1389 | } | |
1390 | } | |
1391 | ||
1392 | static void | |
1393 | do_nologin(struct passwd *pw) | |
1394 | { | |
1395 | FILE *f = NULL; | |
1396 | char buf[1024]; | |
1397 | ||
1398 | #ifdef HAVE_LOGIN_CAP | |
1399 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1400 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1401 | _PATH_NOLOGIN), "r"); | |
1402 | #else | |
1403 | if (pw->pw_uid) | |
1404 | f = fopen(_PATH_NOLOGIN, "r"); | |
1405 | #endif | |
1406 | if (f) { | |
1407 | /* /etc/nologin exists. Print its contents and exit. */ | |
7cac2b65 | 1408 | logit("User %.100s not allowed because %s exists", |
d03f4262 | 1409 | pw->pw_name, _PATH_NOLOGIN); |
e9702f7d | 1410 | while (fgets(buf, sizeof(buf), f)) |
1411 | fputs(buf, stderr); | |
1412 | fclose(f); | |
bfe49944 | 1413 | fflush(NULL); |
e9702f7d | 1414 | exit(254); |
1415 | } | |
1416 | } | |
1417 | ||
1418 | /* Set login name, uid, gid, and groups. */ | |
350391c5 | 1419 | void |
e9702f7d | 1420 | do_setusercontext(struct passwd *pw) |
1421 | { | |
bfe49944 | 1422 | #ifndef HAVE_CYGWIN |
1423 | if (getuid() == 0 || geteuid() == 0) | |
e9702f7d | 1424 | #endif /* HAVE_CYGWIN */ |
bfe49944 | 1425 | { |
1426 | ||
44a053a3 | 1427 | #ifdef HAVE_SETPCRED |
7cac2b65 | 1428 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1429 | fatal("Failed to set process credentials"); | |
44a053a3 | 1430 | #endif /* HAVE_SETPCRED */ |
e9702f7d | 1431 | #ifdef HAVE_LOGIN_CAP |
d03f4262 | 1432 | # ifdef __bsdi__ |
276b07a3 | 1433 | setpgid(0, 0); |
d03f4262 | 1434 | # endif |
dfddba3d | 1435 | #ifdef GSSAPI |
1436 | if (options.gss_authentication) { | |
1437 | temporarily_use_uid(pw); | |
1438 | ssh_gssapi_storecreds(); | |
1439 | restore_uid(); | |
1440 | } | |
1441 | #endif | |
540d72c3 | 1442 | # ifdef USE_PAM |
1443 | if (options.use_pam) { | |
1444 | do_pam_session(); | |
1445 | do_pam_setcred(0); | |
1446 | } | |
1447 | # endif /* USE_PAM */ | |
e9702f7d | 1448 | if (setusercontext(lc, pw, pw->pw_uid, |
1449 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1450 | perror("unable to set user context"); | |
1451 | exit(1); | |
1452 | } | |
1453 | #else | |
1454 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1455 | /* Sets login uid for accounting */ | |
1456 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1457 | error("setluid: %s", strerror(errno)); | |
1458 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1459 | ||
1460 | if (setlogin(pw->pw_name) < 0) | |
1461 | error("setlogin failed: %s", strerror(errno)); | |
1462 | if (setgid(pw->pw_gid) < 0) { | |
1463 | perror("setgid"); | |
1464 | exit(1); | |
1465 | } | |
1466 | /* Initialize the group list. */ | |
1467 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1468 | perror("initgroups"); | |
1469 | exit(1); | |
1470 | } | |
1471 | endgrent(); | |
dfddba3d | 1472 | #ifdef GSSAPI |
1473 | if (options.gss_authentication) { | |
1474 | temporarily_use_uid(pw); | |
1475 | ssh_gssapi_storecreds(); | |
1476 | restore_uid(); | |
1477 | } | |
1478 | #endif | |
e9702f7d | 1479 | # ifdef USE_PAM |
1480 | /* | |
540d72c3 | 1481 | * PAM credentials may take the form of supplementary groups. |
e9702f7d | 1482 | * These will have been wiped by the above initgroups() call. |
1483 | * Reestablish them here. | |
1484 | */ | |
7cac2b65 | 1485 | if (options.use_pam) { |
1486 | do_pam_session(); | |
1487 | do_pam_setcred(0); | |
1488 | } | |
e9702f7d | 1489 | # endif /* USE_PAM */ |
1490 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1491 | irix_setusercontext(pw); | |
1492 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
276b07a3 | 1493 | # ifdef _AIX |
d03f4262 | 1494 | aix_usrinfo(pw); |
276b07a3 | 1495 | # endif /* _AIX */ |
2ce0bfe4 | 1496 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
1497 | if (set_id(pw->pw_name) != 0) { | |
1498 | exit(1); | |
1499 | } | |
1500 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ | |
e9702f7d | 1501 | /* Permanently switch to the desired uid. */ |
1502 | permanently_set_uid(pw); | |
1503 | #endif | |
1504 | } | |
bfe49944 | 1505 | |
1506 | #ifdef HAVE_CYGWIN | |
1507 | if (is_winnt) | |
1508 | #endif | |
e9702f7d | 1509 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1510 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1511 | } | |
1512 | ||
540d72c3 | 1513 | static void |
1514 | do_pwchange(Session *s) | |
1515 | { | |
7e82606e | 1516 | fflush(NULL); |
540d72c3 | 1517 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1518 | if (s->ttyfd != -1) { | |
7e82606e | 1519 | fprintf(stderr, |
540d72c3 | 1520 | "You must change your password now and login again!\n"); |
dfddba3d | 1521 | #ifdef PASSWD_NEEDS_USERNAME |
1522 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1523 | (char *)NULL); | |
1524 | #else | |
540d72c3 | 1525 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
dfddba3d | 1526 | #endif |
540d72c3 | 1527 | perror("passwd"); |
1528 | } else { | |
1529 | fprintf(stderr, | |
1530 | "Password change required but no TTY available.\n"); | |
1531 | } | |
1532 | exit(1); | |
1533 | } | |
1534 | ||
350391c5 | 1535 | static void |
1536 | launch_login(struct passwd *pw, const char *hostname) | |
1537 | { | |
1538 | /* Launch login(1). */ | |
1539 | ||
44a053a3 | 1540 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
350391c5 | 1541 | #ifdef xxxLOGIN_NEEDS_TERM |
44a053a3 | 1542 | (s->term ? s->term : "unknown"), |
350391c5 | 1543 | #endif /* LOGIN_NEEDS_TERM */ |
1544 | #ifdef LOGIN_NO_ENDOPT | |
1545 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1546 | #else | |
1547 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1548 | #endif | |
1549 | ||
1550 | /* Login couldn't be executed, die. */ | |
1551 | ||
1552 | perror("login"); | |
1553 | exit(1); | |
1554 | } | |
1555 | ||
540d72c3 | 1556 | static void |
1557 | child_close_fds(void) | |
1558 | { | |
1559 | int i; | |
1560 | ||
1561 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1562 | close(packet_get_connection_in()); | |
1563 | else { | |
1564 | close(packet_get_connection_in()); | |
1565 | close(packet_get_connection_out()); | |
1566 | } | |
1567 | /* | |
1568 | * Close all descriptors related to channels. They will still remain | |
1569 | * open in the parent. | |
1570 | */ | |
1571 | /* XXX better use close-on-exec? -markus */ | |
1572 | channel_close_all(); | |
1573 | ||
1574 | /* | |
1575 | * Close any extra file descriptors. Note that there may still be | |
1576 | * descriptors left by system functions. They will be closed later. | |
1577 | */ | |
1578 | endpwent(); | |
1579 | ||
1580 | /* | |
08822d99 | 1581 | * Close any extra open file descriptors so that we don't have them |
540d72c3 | 1582 | * hanging around in clients. Note that we want to do this after |
1583 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1584 | * descriptors open. | |
1585 | */ | |
1586 | for (i = 3; i < 64; i++) | |
1587 | close(i); | |
1588 | } | |
1589 | ||
e9702f7d | 1590 | /* |
1591 | * Performs common processing for the child, such as setting up the | |
1592 | * environment, closing extra file descriptors, setting the user and group | |
1593 | * ids, and executing the command or shell. | |
1594 | */ | |
1595 | void | |
1596 | do_child(Session *s, const char *command) | |
1597 | { | |
1598 | extern char **environ; | |
1599 | char **env; | |
1600 | char *argv[10]; | |
1601 | const char *shell, *shell0, *hostname = NULL; | |
1602 | struct passwd *pw = s->pw; | |
e9702f7d | 1603 | |
62eb343a | 1604 | #ifdef AFS_KRB5 |
1605 | /* Default place to look for aklog. */ | |
1606 | #ifdef AKLOG_PATH | |
1607 | #define KPROGDIR AKLOG_PATH | |
1608 | #else | |
1609 | #define KPROGDIR "/usr/bin/aklog" | |
1610 | #endif /* AKLOG_PATH */ | |
1611 | ||
1612 | struct stat st; | |
1613 | char *aklog_path; | |
1614 | #endif /* AFS_KRB5 */ | |
1615 | ||
e9702f7d | 1616 | /* remove hostkey from the child's memory */ |
1617 | destroy_sensitive_data(); | |
1618 | ||
540d72c3 | 1619 | /* Force a password change */ |
1620 | if (s->authctxt->force_pwchange) { | |
1621 | do_setusercontext(pw); | |
1622 | child_close_fds(); | |
1623 | do_pwchange(s); | |
1624 | exit(1); | |
1625 | } | |
1626 | ||
e9702f7d | 1627 | /* login(1) is only called if we execute the login shell */ |
1628 | if (options.use_login && command != NULL) | |
1629 | options.use_login = 0; | |
1630 | ||
d03f4262 | 1631 | #ifdef _UNICOS |
1632 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1633 | #endif /* _UNICOS */ | |
1634 | ||
e9702f7d | 1635 | /* |
1636 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1637 | * switch, so we let login(1) to this for us. | |
1638 | */ | |
1639 | if (!options.use_login) { | |
1640 | #ifdef HAVE_OSF_SIA | |
bfe49944 | 1641 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
e9702f7d | 1642 | if (!check_quietlogin(s, command)) |
1643 | do_motd(); | |
1644 | #else /* HAVE_OSF_SIA */ | |
08822d99 | 1645 | /* When PAM is enabled we rely on it to do the nologin check */ |
1646 | if (!options.use_pam) | |
1647 | do_nologin(pw); | |
e9702f7d | 1648 | do_setusercontext(pw); |
7e82606e | 1649 | /* |
1650 | * PAM session modules in do_setusercontext may have | |
1651 | * generated messages, so if this in an interactive | |
1652 | * login then display them too. | |
1653 | */ | |
dfddba3d | 1654 | if (!check_quietlogin(s, command)) |
7e82606e | 1655 | display_loginmsg(); |
e9702f7d | 1656 | #endif /* HAVE_OSF_SIA */ |
1657 | } | |
1658 | ||
dfddba3d | 1659 | #ifdef USE_PAM |
8b32eddc | 1660 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1661 | debug3("PAM session not opened, exiting"); | |
dfddba3d | 1662 | display_loginmsg(); |
1663 | exit(254); | |
1664 | } | |
1665 | #endif | |
1666 | ||
e9702f7d | 1667 | /* |
1668 | * Get the shell from the password data. An empty shell field is | |
1669 | * legal, and means /bin/sh. | |
1670 | */ | |
1671 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
bfe49944 | 1672 | |
1673 | /* | |
1674 | * Make sure $SHELL points to the shell from the password file, | |
1675 | * even if shell is overridden from login.conf | |
1676 | */ | |
1677 | env = do_setup_env(s, shell); | |
1678 | ||
e9702f7d | 1679 | #ifdef HAVE_LOGIN_CAP |
1680 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1681 | #endif | |
1682 | ||
3c0ef626 | 1683 | /* we have to stash the hostname before we close our socket. */ |
1684 | if (options.use_login) | |
1685 | hostname = get_remote_name_or_ip(utmp_len, | |
7cac2b65 | 1686 | options.use_dns); |
3c0ef626 | 1687 | /* |
1688 | * Close the connection descriptors; note that this is the child, and | |
1689 | * the server will still have the socket open, and it is important | |
1690 | * that we do not shutdown it. Note that the descriptors cannot be | |
1691 | * closed before building the environment, as we call | |
1692 | * get_remote_ipaddr there. | |
1693 | */ | |
540d72c3 | 1694 | child_close_fds(); |
3c0ef626 | 1695 | |
1696 | /* | |
540d72c3 | 1697 | * Must take new environment into use so that .ssh/rc, |
1698 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
3c0ef626 | 1699 | */ |
540d72c3 | 1700 | environ = env; |
3c0ef626 | 1701 | |
540d72c3 | 1702 | #if defined(KRB5) && defined(USE_AFS) |
3c0ef626 | 1703 | /* |
540d72c3 | 1704 | * At this point, we check to see if AFS is active and if we have |
1705 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1706 | * if we can (and need to) extend the ticket into an AFS token. If | |
1707 | * we don't do this, we run into potential problems if the user's | |
1708 | * home directory is in AFS and it's not world-readable. | |
3c0ef626 | 1709 | */ |
3c0ef626 | 1710 | |
540d72c3 | 1711 | if (options.kerberos_get_afs_token && k_hasafs() && |
2ce0bfe4 | 1712 | (s->authctxt->krb5_ctx != NULL)) { |
540d72c3 | 1713 | char cell[64]; |
1714 | ||
1715 | debug("Getting AFS token"); | |
1716 | ||
1717 | k_setpag(); | |
1718 | ||
1719 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1720 | krb5_afslog(s->authctxt->krb5_ctx, | |
1721 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1722 | ||
1723 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1724 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1725 | } | |
1726 | #endif | |
3c0ef626 | 1727 | |
62eb343a | 1728 | #ifdef AFS_KRB5 |
1729 | ||
1730 | /* User has authenticated, and if a ticket was going to be | |
1731 | * passed we would have it. KRB5CCNAME should already be set. | |
1732 | * Now try to get an AFS token using aklog. | |
1733 | */ | |
1734 | if (k_hasafs()) { /* Do we have AFS? */ | |
1735 | ||
1736 | aklog_path = xstrdup(KPROGDIR); | |
1737 | ||
1738 | /* | |
1739 | * Make sure it exists before we try to run it | |
1740 | */ | |
1741 | if (stat(aklog_path, &st) == 0) { | |
1742 | debug("Running %s to get afs token.",aklog_path); | |
1743 | system(aklog_path); | |
1744 | } else { | |
1745 | debug("%s does not exist.",aklog_path); | |
1746 | } | |
1747 | ||
1748 | xfree(aklog_path); | |
1749 | } | |
1750 | #endif /* AFS_KRB5 */ | |
1751 | ||
75be3237 | 1752 | #ifdef SESSION_HOOKS |
1753 | if (options.session_hooks_allow && | |
1754 | options.session_hooks_startup_cmd) | |
1755 | { | |
1756 | execute_session_hook(options.session_hooks_startup_cmd, | |
1757 | s->authctxt, | |
1758 | /* startup = */ 1, | |
1759 | options.session_hooks_shutdown_cmd != NULL); | |
1760 | } | |
1761 | #endif | |
3c0ef626 | 1762 | |
08822d99 | 1763 | /* Change current directory to the user's home directory. */ |
3c0ef626 | 1764 | if (chdir(pw->pw_dir) < 0) { |
1765 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1766 | pw->pw_dir, strerror(errno)); | |
1767 | #ifdef HAVE_LOGIN_CAP | |
1768 | if (login_getcapbool(lc, "requirehome", 0)) | |
1769 | exit(1); | |
1770 | #endif | |
1771 | } | |
1772 | ||
e9702f7d | 1773 | if (!options.use_login) |
1774 | do_rc_files(s, shell); | |
3c0ef626 | 1775 | |
1776 | /* restore SIGPIPE for child */ | |
1777 | signal(SIGPIPE, SIG_DFL); | |
1778 | ||
e9702f7d | 1779 | if (options.use_login) { |
350391c5 | 1780 | launch_login(pw, hostname); |
1781 | /* NEVERREACHED */ | |
e9702f7d | 1782 | } |
1783 | ||
1784 | /* Get the last component of the shell name. */ | |
1785 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1786 | shell0++; | |
1787 | else | |
1788 | shell0 = shell; | |
1789 | ||
3c0ef626 | 1790 | /* |
1791 | * If we have no command, execute the shell. In this case, the shell | |
1792 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1793 | * this is a login shell. | |
1794 | */ | |
1795 | if (!command) { | |
e9702f7d | 1796 | char argv0[256]; |
3c0ef626 | 1797 | |
e9702f7d | 1798 | /* Start the shell. Set initial character to '-'. */ |
1799 | argv0[0] = '-'; | |
3c0ef626 | 1800 | |
e9702f7d | 1801 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1802 | >= sizeof(argv0) - 1) { | |
1803 | errno = EINVAL; | |
3c0ef626 | 1804 | perror(shell); |
1805 | exit(1); | |
e9702f7d | 1806 | } |
3c0ef626 | 1807 | |
e9702f7d | 1808 | /* Execute the shell. */ |
1809 | argv[0] = argv0; | |
1810 | argv[1] = NULL; | |
5ab1e3bd | 1811 | execve(shell, argv, environ); |
3c0ef626 | 1812 | |
e9702f7d | 1813 | /* Executing the shell failed. */ |
1814 | perror(shell); | |
1815 | exit(1); | |
3c0ef626 | 1816 | } |
1817 | /* | |
1818 | * Execute the command using the user's shell. This uses the -c | |
1819 | * option to execute the command. | |
1820 | */ | |
e9702f7d | 1821 | argv[0] = (char *) shell0; |
3c0ef626 | 1822 | argv[1] = "-c"; |
1823 | argv[2] = (char *) command; | |
1824 | argv[3] = NULL; | |
5ab1e3bd | 1825 | execve(shell, argv, environ); |
3c0ef626 | 1826 | perror(shell); |
1827 | exit(1); | |
1828 | } | |
1829 | ||
1830 | Session * | |
1831 | session_new(void) | |
1832 | { | |
1833 | int i; | |
1834 | static int did_init = 0; | |
1835 | if (!did_init) { | |
1836 | debug("session_new: init"); | |
e9702f7d | 1837 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1838 | sessions[i].used = 0; |
1839 | } | |
1840 | did_init = 1; | |
1841 | } | |
e9702f7d | 1842 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1843 | Session *s = &sessions[i]; |
1844 | if (! s->used) { | |
1845 | memset(s, 0, sizeof(*s)); | |
1846 | s->chanid = -1; | |
1847 | s->ptyfd = -1; | |
1848 | s->ttyfd = -1; | |
1849 | s->used = 1; | |
1850 | s->self = i; | |
2ce0bfe4 | 1851 | s->x11_chanids = NULL; |
3c0ef626 | 1852 | debug("session_new: session %d", i); |
1853 | return s; | |
1854 | } | |
1855 | } | |
1856 | return NULL; | |
1857 | } | |
1858 | ||
1859 | static void | |
1860 | session_dump(void) | |
1861 | { | |
1862 | int i; | |
e9702f7d | 1863 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1864 | Session *s = &sessions[i]; |
44a053a3 | 1865 | debug("dump: used %d session %d %p channel %d pid %ld", |
3c0ef626 | 1866 | s->used, |
1867 | s->self, | |
1868 | s, | |
1869 | s->chanid, | |
44a053a3 | 1870 | (long)s->pid); |
3c0ef626 | 1871 | } |
1872 | } | |
1873 | ||
1874 | int | |
1875 | session_open(Authctxt *authctxt, int chanid) | |
1876 | { | |
1877 | Session *s = session_new(); | |
1878 | debug("session_open: channel %d", chanid); | |
1879 | if (s == NULL) { | |
1880 | error("no more sessions"); | |
1881 | return 0; | |
1882 | } | |
1883 | s->authctxt = authctxt; | |
1884 | s->pw = authctxt->pw; | |
540d72c3 | 1885 | if (s->pw == NULL || !authctxt->valid) |
3c0ef626 | 1886 | fatal("no user for session %d", s->self); |
1887 | debug("session_open: session %d: link with channel %d", s->self, chanid); | |
1888 | s->chanid = chanid; | |
1889 | return 1; | |
1890 | } | |
1891 | ||
350391c5 | 1892 | Session * |
1893 | session_by_tty(char *tty) | |
1894 | { | |
1895 | int i; | |
1896 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1897 | Session *s = &sessions[i]; | |
1898 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1899 | debug("session_by_tty: session %d tty %s", i, tty); | |
1900 | return s; | |
1901 | } | |
1902 | } | |
1903 | debug("session_by_tty: unknown tty %.100s", tty); | |
1904 | session_dump(); | |
1905 | return NULL; | |
1906 | } | |
1907 | ||
3c0ef626 | 1908 | static Session * |
1909 | session_by_channel(int id) | |
1910 | { | |
1911 | int i; | |
e9702f7d | 1912 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1913 | Session *s = &sessions[i]; |
1914 | if (s->used && s->chanid == id) { | |
1915 | debug("session_by_channel: session %d channel %d", i, id); | |
1916 | return s; | |
1917 | } | |
1918 | } | |
1919 | debug("session_by_channel: unknown channel %d", id); | |
1920 | session_dump(); | |
1921 | return NULL; | |
1922 | } | |
1923 | ||
2ce0bfe4 | 1924 | static Session * |
1925 | session_by_x11_channel(int id) | |
1926 | { | |
1927 | int i, j; | |
1928 | ||
1929 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1930 | Session *s = &sessions[i]; | |
1931 | ||
1932 | if (s->x11_chanids == NULL || !s->used) | |
1933 | continue; | |
1934 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
1935 | if (s->x11_chanids[j] == id) { | |
1936 | debug("session_by_x11_channel: session %d " | |
1937 | "channel %d", s->self, id); | |
1938 | return s; | |
1939 | } | |
1940 | } | |
1941 | } | |
1942 | debug("session_by_x11_channel: unknown channel %d", id); | |
1943 | session_dump(); | |
1944 | return NULL; | |
1945 | } | |
1946 | ||
3c0ef626 | 1947 | static Session * |
1948 | session_by_pid(pid_t pid) | |
1949 | { | |
1950 | int i; | |
44a053a3 | 1951 | debug("session_by_pid: pid %ld", (long)pid); |
e9702f7d | 1952 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 1953 | Session *s = &sessions[i]; |
1954 | if (s->used && s->pid == pid) | |
1955 | return s; | |
1956 | } | |
44a053a3 | 1957 | error("session_by_pid: unknown pid %ld", (long)pid); |
3c0ef626 | 1958 | session_dump(); |
1959 | return NULL; | |
1960 | } | |
1961 | ||
1962 | static int | |
1963 | session_window_change_req(Session *s) | |
1964 | { | |
1965 | s->col = packet_get_int(); | |
1966 | s->row = packet_get_int(); | |
1967 | s->xpixel = packet_get_int(); | |
1968 | s->ypixel = packet_get_int(); | |
e9702f7d | 1969 | packet_check_eom(); |
3c0ef626 | 1970 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1971 | return 1; | |
1972 | } | |
1973 | ||
1974 | static int | |
1975 | session_pty_req(Session *s) | |
1976 | { | |
1977 | u_int len; | |
1978 | int n_bytes; | |
1979 | ||
1980 | if (no_pty_flag) { | |
1981 | debug("Allocating a pty not permitted for this authentication."); | |
1982 | return 0; | |
1983 | } | |
1984 | if (s->ttyfd != -1) { | |
1985 | packet_disconnect("Protocol error: you already have a pty."); | |
1986 | return 0; | |
1987 | } | |
1988 | ||
1989 | s->term = packet_get_string(&len); | |
1990 | ||
1991 | if (compat20) { | |
1992 | s->col = packet_get_int(); | |
1993 | s->row = packet_get_int(); | |
1994 | } else { | |
1995 | s->row = packet_get_int(); | |
1996 | s->col = packet_get_int(); | |
1997 | } | |
1998 | s->xpixel = packet_get_int(); | |
1999 | s->ypixel = packet_get_int(); | |
2000 | ||
2001 | if (strcmp(s->term, "") == 0) { | |
2002 | xfree(s->term); | |
2003 | s->term = NULL; | |
2004 | } | |
2005 | ||
2006 | /* Allocate a pty and open it. */ | |
2007 | debug("Allocating pty."); | |
350391c5 | 2008 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
3c0ef626 | 2009 | if (s->term) |
2010 | xfree(s->term); | |
2011 | s->term = NULL; | |
2012 | s->ptyfd = -1; | |
2013 | s->ttyfd = -1; | |
2014 | error("session_pty_req: session %d alloc failed", s->self); | |
2015 | return 0; | |
2016 | } | |
2017 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
2018 | ||
2019 | /* for SSH1 the tty modes length is not given */ | |
2020 | if (!compat20) | |
2021 | n_bytes = packet_remaining(); | |
2022 | tty_parse_modes(s->ttyfd, &n_bytes); | |
2023 | ||
350391c5 | 2024 | if (!use_privsep) |
2025 | pty_setowner(s->pw, s->tty); | |
3c0ef626 | 2026 | |
2027 | /* Set window size from the packet. */ | |
2028 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); | |
2029 | ||
e9702f7d | 2030 | packet_check_eom(); |
3c0ef626 | 2031 | session_proctitle(s); |
2032 | return 1; | |
2033 | } | |
2034 | ||
2035 | static int | |
2036 | session_subsystem_req(Session *s) | |
2037 | { | |
2038 | struct stat st; | |
2039 | u_int len; | |
2040 | int success = 0; | |
2041 | char *cmd, *subsys = packet_get_string(&len); | |
2ce0bfe4 | 2042 | u_int i; |
3c0ef626 | 2043 | |
e9702f7d | 2044 | packet_check_eom(); |
7cac2b65 | 2045 | logit("subsystem request for %.100s", subsys); |
3c0ef626 | 2046 | |
2047 | for (i = 0; i < options.num_subsystems; i++) { | |
2048 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { | |
2049 | cmd = options.subsystem_command[i]; | |
2050 | if (stat(cmd, &st) < 0) { | |
2051 | error("subsystem: cannot stat %s: %s", cmd, | |
2052 | strerror(errno)); | |
2053 | break; | |
2054 | } | |
2055 | debug("subsystem: exec() %s", cmd); | |
2056 | s->is_subsystem = 1; | |
2057 | do_exec(s, cmd); | |
2058 | success = 1; | |
e9702f7d | 2059 | break; |
3c0ef626 | 2060 | } |
2061 | } | |
2062 | ||
2063 | if (!success) | |
7cac2b65 | 2064 | logit("subsystem request for %.100s failed, subsystem not found", |
3c0ef626 | 2065 | subsys); |
2066 | ||
2067 | xfree(subsys); | |
2068 | return success; | |
2069 | } | |
2070 | ||
2071 | static int | |
2072 | session_x11_req(Session *s) | |
2073 | { | |
2074 | int success; | |
2075 | ||
2ce0bfe4 | 2076 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
2077 | error("session_x11_req: session %d: " | |
08822d99 | 2078 | "x11 forwarding already active", s->self); |
2ce0bfe4 | 2079 | return 0; |
2080 | } | |
3c0ef626 | 2081 | s->single_connection = packet_get_char(); |
2082 | s->auth_proto = packet_get_string(NULL); | |
2083 | s->auth_data = packet_get_string(NULL); | |
2084 | s->screen = packet_get_int(); | |
e9702f7d | 2085 | packet_check_eom(); |
3c0ef626 | 2086 | |
2087 | success = session_setup_x11fwd(s); | |
2088 | if (!success) { | |
2089 | xfree(s->auth_proto); | |
2090 | xfree(s->auth_data); | |
2091 | s->auth_proto = NULL; | |
2092 | s->auth_data = NULL; | |
2093 | } | |
2094 | return success; | |
2095 | } | |
2096 | ||
2097 | static int | |
2098 | session_shell_req(Session *s) | |
2099 | { | |
e9702f7d | 2100 | packet_check_eom(); |
3c0ef626 | 2101 | do_exec(s, NULL); |
2102 | return 1; | |
2103 | } | |
2104 | ||
2105 | static int | |
2106 | session_exec_req(Session *s) | |
2107 | { | |
2108 | u_int len; | |
2109 | char *command = packet_get_string(&len); | |
e9702f7d | 2110 | packet_check_eom(); |
3c0ef626 | 2111 | do_exec(s, command); |
2112 | xfree(command); | |
2113 | return 1; | |
2114 | } | |
2115 | ||
7cac2b65 | 2116 | static int |
2117 | session_break_req(Session *s) | |
2118 | { | |
7cac2b65 | 2119 | |
7e82606e | 2120 | packet_get_int(); /* ignored */ |
7cac2b65 | 2121 | packet_check_eom(); |
2122 | ||
2123 | if (s->ttyfd == -1 || | |
2124 | tcsendbreak(s->ttyfd, 0) < 0) | |
2125 | return 0; | |
2126 | return 1; | |
2127 | } | |
2128 | ||
7e82606e | 2129 | static int |
2130 | session_env_req(Session *s) | |
2131 | { | |
2132 | char *name, *val; | |
2133 | u_int name_len, val_len, i; | |
2134 | ||
2135 | name = packet_get_string(&name_len); | |
2136 | val = packet_get_string(&val_len); | |
2137 | packet_check_eom(); | |
2138 | ||
2139 | /* Don't set too many environment variables */ | |
2140 | if (s->num_env > 128) { | |
2141 | debug2("Ignoring env request %s: too many env vars", name); | |
2142 | goto fail; | |
2143 | } | |
2144 | ||
2145 | for (i = 0; i < options.num_accept_env; i++) { | |
2146 | if (match_pattern(name, options.accept_env[i])) { | |
2147 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
2148 | s->env = xrealloc(s->env, sizeof(*s->env) * | |
2149 | (s->num_env + 1)); | |
2150 | s->env[s->num_env].name = name; | |
2151 | s->env[s->num_env].val = val; | |
2152 | s->num_env++; | |
2153 | return (1); | |
2154 | } | |
2155 | } | |
2156 | debug2("Ignoring env request %s: disallowed name", name); | |
2157 | ||
2158 | fail: | |
2159 | xfree(name); | |
2160 | xfree(val); | |
2161 | return (0); | |
2162 | } | |
2163 | ||
3c0ef626 | 2164 | static int |
2165 | session_auth_agent_req(Session *s) | |
2166 | { | |
2167 | static int called = 0; | |
e9702f7d | 2168 | packet_check_eom(); |
3c0ef626 | 2169 | if (no_agent_forwarding_flag) { |
2170 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
2171 | return 0; | |
2172 | } | |
2173 | if (called) { | |
2174 | return 0; | |
2175 | } else { | |
2176 | called = 1; | |
2177 | return auth_input_request_forwarding(s->pw); | |
2178 | } | |
2179 | } | |
2180 | ||
e9702f7d | 2181 | int |
2182 | session_input_channel_req(Channel *c, const char *rtype) | |
3c0ef626 | 2183 | { |
3c0ef626 | 2184 | int success = 0; |
3c0ef626 | 2185 | Session *s; |
3c0ef626 | 2186 | |
e9702f7d | 2187 | if ((s = session_by_channel(c->self)) == NULL) { |
7cac2b65 | 2188 | logit("session_input_channel_req: no session %d req %.100s", |
e9702f7d | 2189 | c->self, rtype); |
2190 | return 0; | |
2191 | } | |
2192 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
3c0ef626 | 2193 | |
2194 | /* | |
2195 | * a session is in LARVAL state until a shell, a command | |
2196 | * or a subsystem is executed | |
2197 | */ | |
2198 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2199 | if (strcmp(rtype, "shell") == 0) { | |
2200 | success = session_shell_req(s); | |
2201 | } else if (strcmp(rtype, "exec") == 0) { | |
2202 | success = session_exec_req(s); | |
2203 | } else if (strcmp(rtype, "pty-req") == 0) { | |
2204 | success = session_pty_req(s); | |
2205 | } else if (strcmp(rtype, "x11-req") == 0) { | |
2206 | success = session_x11_req(s); | |
2207 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { | |
2208 | success = session_auth_agent_req(s); | |
2209 | } else if (strcmp(rtype, "subsystem") == 0) { | |
2210 | success = session_subsystem_req(s); | |
7e82606e | 2211 | } else if (strcmp(rtype, "env") == 0) { |
2212 | success = session_env_req(s); | |
3c0ef626 | 2213 | } |
2214 | } | |
2215 | if (strcmp(rtype, "window-change") == 0) { | |
2216 | success = session_window_change_req(s); | |
7e82606e | 2217 | } else if (strcmp(rtype, "break") == 0) { |
2218 | success = session_break_req(s); | |
3c0ef626 | 2219 | } |
7e82606e | 2220 | |
e9702f7d | 2221 | return success; |
3c0ef626 | 2222 | } |
2223 | ||
2224 | void | |
2225 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2226 | { | |
2227 | if (!compat20) | |
2228 | fatal("session_set_fds: called for proto != 2.0"); | |
2229 | /* | |
2230 | * now that have a child and a pipe to the child, | |
2231 | * we can activate our channel and register the fd's | |
2232 | */ | |
2233 | if (s->chanid == -1) | |
2234 | fatal("no channel for session %d", s->self); | |
2235 | channel_set_fds(s->chanid, | |
2236 | fdout, fdin, fderr, | |
2237 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, | |
e9702f7d | 2238 | 1, |
2239 | CHAN_SES_WINDOW_DEFAULT); | |
3c0ef626 | 2240 | } |
2241 | ||
2242 | /* | |
2243 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2244 | * (e.g., due to a dropped connection). | |
2245 | */ | |
350391c5 | 2246 | void |
540d72c3 | 2247 | session_pty_cleanup2(Session *s) |
3c0ef626 | 2248 | { |
3c0ef626 | 2249 | if (s == NULL) { |
2250 | error("session_pty_cleanup: no session"); | |
2251 | return; | |
2252 | } | |
2253 | if (s->ttyfd == -1) | |
2254 | return; | |
2255 | ||
2256 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); | |
2257 | ||
2258 | /* Record that the user has logged out. */ | |
2259 | if (s->pid != 0) | |
e9702f7d | 2260 | record_logout(s->pid, s->tty, s->pw->pw_name); |
3c0ef626 | 2261 | |
2262 | /* Release the pseudo-tty. */ | |
350391c5 | 2263 | if (getuid() == 0) |
2264 | pty_release(s->tty); | |
3c0ef626 | 2265 | |
2266 | /* | |
2267 | * Close the server side of the socket pairs. We must do this after | |
2268 | * the pty cleanup, so that another process doesn't get this pty | |
2269 | * while we're still cleaning up. | |
2270 | */ | |
2271 | if (close(s->ptymaster) < 0) | |
350391c5 | 2272 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
3c0ef626 | 2273 | |
2274 | /* unlink pty from session */ | |
2275 | s->ttyfd = -1; | |
2276 | } | |
2277 | ||
350391c5 | 2278 | void |
540d72c3 | 2279 | session_pty_cleanup(Session *s) |
350391c5 | 2280 | { |
540d72c3 | 2281 | PRIVSEP(session_pty_cleanup2(s)); |
350391c5 | 2282 | } |
2283 | ||
d03f4262 | 2284 | static char * |
2285 | sig2name(int sig) | |
2286 | { | |
2287 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2288 | SSH_SIG(ABRT); | |
2289 | SSH_SIG(ALRM); | |
2290 | SSH_SIG(FPE); | |
2291 | SSH_SIG(HUP); | |
2292 | SSH_SIG(ILL); | |
2293 | SSH_SIG(INT); | |
2294 | SSH_SIG(KILL); | |
2295 | SSH_SIG(PIPE); | |
2296 | SSH_SIG(QUIT); | |
2297 | SSH_SIG(SEGV); | |
2298 | SSH_SIG(TERM); | |
2299 | SSH_SIG(USR1); | |
2300 | SSH_SIG(USR2); | |
2301 | #undef SSH_SIG | |
2302 | return "SIG@openssh.com"; | |
2303 | } | |
2304 | ||
2ce0bfe4 | 2305 | static void |
2306 | session_close_x11(int id) | |
2307 | { | |
2308 | Channel *c; | |
2309 | ||
08822d99 | 2310 | if ((c = channel_by_id(id)) == NULL) { |
2ce0bfe4 | 2311 | debug("session_close_x11: x11 channel %d missing", id); |
2312 | } else { | |
2313 | /* Detach X11 listener */ | |
2314 | debug("session_close_x11: detach x11 channel %d", id); | |
2315 | channel_cancel_cleanup(id); | |
2316 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2317 | chan_mark_dead(c); | |
2318 | } | |
2319 | } | |
2320 | ||
2321 | static void | |
2322 | session_close_single_x11(int id, void *arg) | |
2323 | { | |
2324 | Session *s; | |
2325 | u_int i; | |
2326 | ||
2327 | debug3("session_close_single_x11: channel %d", id); | |
2328 | channel_cancel_cleanup(id); | |
2329 | if ((s = session_by_x11_channel(id)) == NULL) | |
2330 | fatal("session_close_single_x11: no x11 channel %d", id); | |
2331 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2332 | debug("session_close_single_x11: session %d: " | |
2333 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2334 | /* | |
2335 | * The channel "id" is already closing, but make sure we | |
2336 | * close all of its siblings. | |
2337 | */ | |
2338 | if (s->x11_chanids[i] != id) | |
2339 | session_close_x11(s->x11_chanids[i]); | |
2340 | } | |
2341 | xfree(s->x11_chanids); | |
2342 | s->x11_chanids = NULL; | |
2343 | if (s->display) { | |
2344 | xfree(s->display); | |
2345 | s->display = NULL; | |
2346 | } | |
2347 | if (s->auth_proto) { | |
2348 | xfree(s->auth_proto); | |
2349 | s->auth_proto = NULL; | |
2350 | } | |
2351 | if (s->auth_data) { | |
2352 | xfree(s->auth_data); | |
2353 | s->auth_data = NULL; | |
2354 | } | |
2355 | if (s->auth_display) { | |
2356 | xfree(s->auth_display); | |
2357 | s->auth_display = NULL; | |
2358 | } | |
2359 | } | |
2360 | ||
3c0ef626 | 2361 | static void |
2362 | session_exit_message(Session *s, int status) | |
2363 | { | |
2364 | Channel *c; | |
e9702f7d | 2365 | |
2366 | if ((c = channel_lookup(s->chanid)) == NULL) | |
3c0ef626 | 2367 | fatal("session_exit_message: session %d: no channel %d", |
2368 | s->self, s->chanid); | |
44a053a3 | 2369 | debug("session_exit_message: session %d channel %d pid %ld", |
2370 | s->self, s->chanid, (long)s->pid); | |
3c0ef626 | 2371 | |
2372 | if (WIFEXITED(status)) { | |
e9702f7d | 2373 | channel_request_start(s->chanid, "exit-status", 0); |
3c0ef626 | 2374 | packet_put_int(WEXITSTATUS(status)); |
2375 | packet_send(); | |
2376 | } else if (WIFSIGNALED(status)) { | |
e9702f7d | 2377 | channel_request_start(s->chanid, "exit-signal", 0); |
d03f4262 | 2378 | packet_put_cstring(sig2name(WTERMSIG(status))); |
3c0ef626 | 2379 | #ifdef WCOREDUMP |
2380 | packet_put_char(WCOREDUMP(status)); | |
2381 | #else /* WCOREDUMP */ | |
2382 | packet_put_char(0); | |
2383 | #endif /* WCOREDUMP */ | |
2384 | packet_put_cstring(""); | |
2385 | packet_put_cstring(""); | |
2386 | packet_send(); | |
2387 | } else { | |
2388 | /* Some weird exit cause. Just exit. */ | |
2389 | packet_disconnect("wait returned status %04x.", status); | |
2390 | } | |
2391 | ||
2392 | /* disconnect channel */ | |
2393 | debug("session_exit_message: release channel %d", s->chanid); | |
08822d99 | 2394 | |
2395 | /* | |
2396 | * Adjust cleanup callback attachment to send close messages when | |
2397 | * the channel gets EOF. The session will be then be closed | |
2398 | * by session_close_by_channel when the childs close their fds. | |
2399 | */ | |
2400 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2401 | ||
3c0ef626 | 2402 | /* |
2403 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2404 | * interested in data we write. | |
2405 | * Note that we must not call 'chan_read_failed', since there could | |
2406 | * be some more data waiting in the pipe. | |
2407 | */ | |
2408 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2409 | chan_write_failed(c); | |
3c0ef626 | 2410 | } |
2411 | ||
350391c5 | 2412 | void |
3c0ef626 | 2413 | session_close(Session *s) |
2414 | { | |
2ce0bfe4 | 2415 | u_int i; |
7e82606e | 2416 | |
44a053a3 | 2417 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
540d72c3 | 2418 | if (s->ttyfd != -1) |
3c0ef626 | 2419 | session_pty_cleanup(s); |
3c0ef626 | 2420 | if (s->term) |
2421 | xfree(s->term); | |
2422 | if (s->display) | |
2423 | xfree(s->display); | |
2ce0bfe4 | 2424 | if (s->x11_chanids) |
2425 | xfree(s->x11_chanids); | |
e9702f7d | 2426 | if (s->auth_display) |
2427 | xfree(s->auth_display); | |
3c0ef626 | 2428 | if (s->auth_data) |
2429 | xfree(s->auth_data); | |
2430 | if (s->auth_proto) | |
2431 | xfree(s->auth_proto); | |
2432 | s->used = 0; | |
7e82606e | 2433 | for (i = 0; i < s->num_env; i++) { |
2434 | xfree(s->env[i].name); | |
2435 | xfree(s->env[i].val); | |
2436 | } | |
2437 | if (s->env != NULL) | |
2438 | xfree(s->env); | |
3c0ef626 | 2439 | session_proctitle(s); |
2440 | } | |
2441 | ||
2442 | void | |
2443 | session_close_by_pid(pid_t pid, int status) | |
2444 | { | |
2445 | Session *s = session_by_pid(pid); | |
2446 | if (s == NULL) { | |
44a053a3 | 2447 | debug("session_close_by_pid: no session for pid %ld", |
2448 | (long)pid); | |
3c0ef626 | 2449 | return; |
2450 | } | |
2451 | if (s->chanid != -1) | |
2452 | session_exit_message(s, status); | |
08822d99 | 2453 | if (s->ttyfd != -1) |
2454 | session_pty_cleanup(s); | |
4b6dae8f | 2455 | s->pid = 0; |
3c0ef626 | 2456 | } |
2457 | ||
2458 | /* | |
2459 | * this is called when a channel dies before | |
2460 | * the session 'child' itself dies | |
2461 | */ | |
2462 | void | |
2463 | session_close_by_channel(int id, void *arg) | |
2464 | { | |
2465 | Session *s = session_by_channel(id); | |
08822d99 | 2466 | u_int i; |
2ce0bfe4 | 2467 | |
3c0ef626 | 2468 | if (s == NULL) { |
2469 | debug("session_close_by_channel: no session for id %d", id); | |
2470 | return; | |
2471 | } | |
44a053a3 | 2472 | debug("session_close_by_channel: channel %d child %ld", |
2473 | id, (long)s->pid); | |
3c0ef626 | 2474 | if (s->pid != 0) { |
2475 | debug("session_close_by_channel: channel %d: has child", id); | |
2476 | /* | |
2477 | * delay detach of session, but release pty, since | |
2478 | * the fd's to the child are already closed | |
2479 | */ | |
540d72c3 | 2480 | if (s->ttyfd != -1) |
3c0ef626 | 2481 | session_pty_cleanup(s); |
3c0ef626 | 2482 | return; |
2483 | } | |
2484 | /* detach by removing callback */ | |
2485 | channel_cancel_cleanup(s->chanid); | |
08822d99 | 2486 | |
2487 | /* Close any X11 listeners associated with this session */ | |
2488 | if (s->x11_chanids != NULL) { | |
2489 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2490 | session_close_x11(s->x11_chanids[i]); | |
2491 | s->x11_chanids[i] = -1; | |
2492 | } | |
2493 | } | |
2494 | ||
3c0ef626 | 2495 | s->chanid = -1; |
2496 | session_close(s); | |
2497 | } | |
2498 | ||
2499 | void | |
350391c5 | 2500 | session_destroy_all(void (*closefunc)(Session *)) |
3c0ef626 | 2501 | { |
2502 | int i; | |
e9702f7d | 2503 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2504 | Session *s = &sessions[i]; |
350391c5 | 2505 | if (s->used) { |
2506 | if (closefunc != NULL) | |
2507 | closefunc(s); | |
2508 | else | |
2509 | session_close(s); | |
2510 | } | |
3c0ef626 | 2511 | } |
2512 | } | |
2513 | ||
2514 | static char * | |
2515 | session_tty_list(void) | |
2516 | { | |
2517 | static char buf[1024]; | |
2518 | int i; | |
bfe49944 | 2519 | char *cp; |
2520 | ||
3c0ef626 | 2521 | buf[0] = '\0'; |
e9702f7d | 2522 | for (i = 0; i < MAX_SESSIONS; i++) { |
3c0ef626 | 2523 | Session *s = &sessions[i]; |
2524 | if (s->used && s->ttyfd != -1) { | |
540d72c3 | 2525 | |
bfe49944 | 2526 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2527 | cp = strrchr(s->tty, '/'); | |
2528 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2529 | } else | |
2530 | cp = s->tty + 5; | |
540d72c3 | 2531 | |
3c0ef626 | 2532 | if (buf[0] != '\0') |
2533 | strlcat(buf, ",", sizeof buf); | |
bfe49944 | 2534 | strlcat(buf, cp, sizeof buf); |
3c0ef626 | 2535 | } |
2536 | } | |
2537 | if (buf[0] == '\0') | |
2538 | strlcpy(buf, "notty", sizeof buf); | |
2539 | return buf; | |
2540 | } | |
2541 | ||
2542 | void | |
2543 | session_proctitle(Session *s) | |
2544 | { | |
2545 | if (s->pw == NULL) | |
2546 | error("no user for session %d", s->self); | |
2547 | else | |
2548 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2549 | } | |
2550 | ||
2551 | int | |
2552 | session_setup_x11fwd(Session *s) | |
2553 | { | |
2554 | struct stat st; | |
e9702f7d | 2555 | char display[512], auth_display[512]; |
2556 | char hostname[MAXHOSTNAMELEN]; | |
2ce0bfe4 | 2557 | u_int i; |
3c0ef626 | 2558 | |
2559 | if (no_x11_forwarding_flag) { | |
2560 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2561 | return 0; | |
2562 | } | |
2563 | if (!options.x11_forwarding) { | |
2564 | debug("X11 forwarding disabled in server configuration file."); | |
2565 | return 0; | |
2566 | } | |
2567 | if (!options.xauth_location || | |
2568 | (stat(options.xauth_location, &st) == -1)) { | |
2569 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2570 | return 0; | |
2571 | } | |
2572 | if (options.use_login) { | |
2573 | packet_send_debug("X11 forwarding disabled; " | |
2574 | "not compatible with UseLogin=yes."); | |
2575 | return 0; | |
2576 | } | |
2577 | if (s->display != NULL) { | |
2578 | debug("X11 display already set."); | |
2579 | return 0; | |
2580 | } | |
276b07a3 | 2581 | if (x11_create_display_inet(options.x11_display_offset, |
2582 | options.x11_use_localhost, s->single_connection, | |
2ce0bfe4 | 2583 | &s->display_number, &s->x11_chanids) == -1) { |
3c0ef626 | 2584 | debug("x11_create_display_inet failed."); |
2585 | return 0; | |
2586 | } | |
2ce0bfe4 | 2587 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2588 | channel_register_cleanup(s->x11_chanids[i], | |
08822d99 | 2589 | session_close_single_x11, 0); |
2ce0bfe4 | 2590 | } |
e9702f7d | 2591 | |
2592 | /* Set up a suitable value for the DISPLAY variable. */ | |
2593 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2594 | fatal("gethostname: %.100s", strerror(errno)); | |
2595 | /* | |
2596 | * auth_display must be used as the displayname when the | |
2597 | * authorization entry is added with xauth(1). This will be | |
2598 | * different than the DISPLAY string for localhost displays. | |
2599 | */ | |
2600 | if (options.x11_use_localhost) { | |
276b07a3 | 2601 | snprintf(display, sizeof display, "localhost:%u.%u", |
e9702f7d | 2602 | s->display_number, s->screen); |
276b07a3 | 2603 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
e9702f7d | 2604 | s->display_number, s->screen); |
2605 | s->display = xstrdup(display); | |
2606 | s->auth_display = xstrdup(auth_display); | |
2607 | } else { | |
2608 | #ifdef IPADDR_IN_DISPLAY | |
2609 | struct hostent *he; | |
2610 | struct in_addr my_addr; | |
2611 | ||
2612 | he = gethostbyname(hostname); | |
2613 | if (he == NULL) { | |
2614 | error("Can't get IP address for X11 DISPLAY."); | |
2615 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2616 | return 0; | |
2617 | } | |
2618 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
276b07a3 | 2619 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
e9702f7d | 2620 | s->display_number, s->screen); |
2621 | #else | |
276b07a3 | 2622 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
e9702f7d | 2623 | s->display_number, s->screen); |
2624 | #endif | |
2625 | s->display = xstrdup(display); | |
2626 | s->auth_display = xstrdup(display); | |
2627 | } | |
2628 | ||
3c0ef626 | 2629 | return 1; |
2630 | } | |
2631 | ||
2632 | static void | |
2633 | do_authenticated2(Authctxt *authctxt) | |
2634 | { | |
2635 | server_loop2(authctxt); | |
540d72c3 | 2636 | } |
2637 | ||
2638 | void | |
2639 | do_cleanup(Authctxt *authctxt) | |
2640 | { | |
2641 | static int called = 0; | |
2642 | ||
2643 | debug("do_cleanup"); | |
2644 | ||
2645 | /* no cleanup if we're in the child for login shell */ | |
2646 | if (is_child) | |
2647 | return; | |
2648 | ||
2649 | /* avoid double cleanup */ | |
2650 | if (called) | |
2651 | return; | |
2652 | called = 1; | |
2653 | ||
2654 | if (authctxt == NULL) | |
2655 | return; | |
2656 | #ifdef KRB5 | |
2657 | if (options.kerberos_ticket_cleanup && | |
2658 | authctxt->krb5_ctx) | |
2659 | krb5_cleanup_proc(authctxt); | |
5598e598 | 2660 | #endif |
540d72c3 | 2661 | |
2662 | #ifdef GSSAPI | |
2663 | if (compat20 && options.gss_cleanup_creds) | |
2664 | ssh_gssapi_cleanup_creds(); | |
2665 | #endif | |
2666 | ||
2667 | #ifdef USE_PAM | |
2668 | if (options.use_pam) { | |
2669 | sshpam_cleanup(); | |
2670 | sshpam_thread_cleanup(); | |
2671 | } | |
2672 | #endif | |
2673 | ||
2674 | /* remove agent socket */ | |
2675 | auth_sock_cleanup_proc(authctxt->pw); | |
2676 | ||
2677 | /* | |
2678 | * Cleanup ptys/utmp only if privsep is disabled, | |
2679 | * or if running in monitor. | |
2680 | */ | |
2681 | if (!use_privsep || mm_is_monitor()) | |
2682 | session_destroy_all(session_pty_cleanup2); | |
3c0ef626 | 2683 | } |