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9305512d | 1 | /* $OpenBSD: session.c,v 1.207 2006/07/08 21:48:53 stevesk Exp $ */ |
7368a6c8 | 2 | /* |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
bcbf86ec | 5 | * |
6 | * As far as I am concerned, the code I have written for this software | |
7 | * can be used freely for any purpose. Any derived versions of this | |
8 | * software must be clearly marked as such, and if the derived work is | |
9 | * incompatible with the protocol description in the RFC file, it must be | |
10 | * called by a name other than "ssh" or "Secure Shell". | |
11 | * | |
e78a59f5 | 12 | * SSH2 support by Markus Friedl. |
a96070d4 | 13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 14 | * |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * 1. Redistributions of source code must retain the above copyright | |
19 | * notice, this list of conditions and the following disclaimer. | |
20 | * 2. Redistributions in binary form must reproduce the above copyright | |
21 | * notice, this list of conditions and the following disclaimer in the | |
22 | * documentation and/or other materials provided with the distribution. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
e78a59f5 | 34 | */ |
7368a6c8 | 35 | |
36 | #include "includes.h" | |
aa2eae64 | 37 | |
38 | #include <sys/types.h> | |
4095f623 | 39 | #ifdef HAVE_SYS_STAT_H |
40 | # include <sys/stat.h> | |
41 | #endif | |
5b04a8bf | 42 | #include <sys/socket.h> |
aa2eae64 | 43 | #include <sys/wait.h> |
cebb4c24 | 44 | #include <sys/un.h> |
a75f5360 | 45 | |
16fbe330 | 46 | #include <grp.h> |
b5b88c19 | 47 | #ifdef HAVE_PATHS_H |
a75f5360 | 48 | #include <paths.h> |
b5b88c19 | 49 | #endif |
b1842393 | 50 | #include <pwd.h> |
ada68823 | 51 | #include <signal.h> |
319d6b41 | 52 | #include <arpa/inet.h> |
7368a6c8 | 53 | |
7368a6c8 | 54 | #include "ssh.h" |
42f11eb2 | 55 | #include "ssh1.h" |
56 | #include "ssh2.h" | |
57 | #include "xmalloc.h" | |
1729c161 | 58 | #include "sshpty.h" |
7368a6c8 | 59 | #include "packet.h" |
60 | #include "buffer.h" | |
61a2c1da | 61 | #include "match.h" |
7368a6c8 | 62 | #include "uidswap.h" |
63 | #include "compat.h" | |
a5efa1bb | 64 | #include "channels.h" |
e78a59f5 | 65 | #include "bufaux.h" |
e78a59f5 | 66 | #include "auth.h" |
38c295d6 | 67 | #include "auth-options.h" |
42f11eb2 | 68 | #include "pathnames.h" |
69 | #include "log.h" | |
70 | #include "servconf.h" | |
1729c161 | 71 | #include "sshlogin.h" |
42f11eb2 | 72 | #include "serverloop.h" |
73 | #include "canohost.h" | |
5ca51e19 | 74 | #include "session.h" |
07200973 | 75 | #include "kex.h" |
1853d1ef | 76 | #include "monitor_wrap.h" |
e78a59f5 | 77 | |
bcfcc5f9 | 78 | #if defined(KRB5) && defined(USE_AFS) |
39dfceeb | 79 | #include <kafs.h> |
80 | #endif | |
81 | ||
7364bd04 | 82 | #ifdef GSSAPI |
83 | #include "ssh-gss.h" | |
84 | #endif | |
85 | ||
7368a6c8 | 86 | /* func */ |
87 | ||
88 | Session *session_new(void); | |
9c328529 | 89 | void session_set_fds(Session *, int, int, int); |
2362db19 | 90 | void session_pty_cleanup(Session *); |
9c328529 | 91 | void session_proctitle(Session *); |
92 | int session_setup_x11fwd(Session *); | |
93 | void do_exec_pty(Session *, const char *); | |
94 | void do_exec_no_pty(Session *, const char *); | |
95 | void do_exec(Session *, const char *); | |
96 | void do_login(Session *, const char *); | |
8a9ac95d | 97 | #ifdef LOGIN_NEEDS_UTMPX |
98 | static void do_pre_login(Session *s); | |
99 | #endif | |
9c328529 | 100 | void do_child(Session *, const char *); |
f2c2fd71 | 101 | void do_motd(void); |
9c328529 | 102 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 103 | |
396c147e | 104 | static void do_authenticated1(Authctxt *); |
105 | static void do_authenticated2(Authctxt *); | |
9c328529 | 106 | |
396c147e | 107 | static int session_pty_req(Session *); |
bb5639fe | 108 | |
7368a6c8 | 109 | /* import */ |
110 | extern ServerOptions options; | |
111 | extern char *__progname; | |
112 | extern int log_stderr; | |
113 | extern int debug_flag; | |
1e3b8b07 | 114 | extern u_int utmp_len; |
089fbbd2 | 115 | extern int startup_pipe; |
e78e738a | 116 | extern void destroy_sensitive_data(void); |
bc7dfc06 | 117 | extern Buffer loginmsg; |
089fbbd2 | 118 | |
b5e300c2 | 119 | /* original command from peer. */ |
c95add71 | 120 | const char *original_command = NULL; |
b5e300c2 | 121 | |
7368a6c8 | 122 | /* data */ |
123 | #define MAX_SESSIONS 10 | |
124 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 125 | |
2e73a022 | 126 | #ifdef HAVE_LOGIN_CAP |
1836f69f | 127 | login_cap_t *lc; |
2e73a022 | 128 | #endif |
129 | ||
2362db19 | 130 | static int is_child = 0; |
131 | ||
149cdb60 | 132 | /* Name and directory of socket for authentication agent forwarding. */ |
133 | static char *auth_sock_name = NULL; | |
134 | static char *auth_sock_dir = NULL; | |
135 | ||
136 | /* removes the agent forwarding socket */ | |
137 | ||
138 | static void | |
2362db19 | 139 | auth_sock_cleanup_proc(struct passwd *pw) |
149cdb60 | 140 | { |
149cdb60 | 141 | if (auth_sock_name != NULL) { |
142 | temporarily_use_uid(pw); | |
143 | unlink(auth_sock_name); | |
144 | rmdir(auth_sock_dir); | |
145 | auth_sock_name = NULL; | |
146 | restore_uid(); | |
147 | } | |
148 | } | |
149 | ||
150 | static int | |
151 | auth_input_request_forwarding(struct passwd * pw) | |
152 | { | |
153 | Channel *nc; | |
154 | int sock; | |
155 | struct sockaddr_un sunaddr; | |
156 | ||
157 | if (auth_sock_name != NULL) { | |
158 | error("authentication forwarding requested twice."); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
163 | temporarily_use_uid(pw); | |
164 | ||
165 | /* Allocate a buffer for the socket name, and format the name. */ | |
166 | auth_sock_name = xmalloc(MAXPATHLEN); | |
167 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
c88de854 | 168 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
149cdb60 | 169 | |
170 | /* Create private directory for socket */ | |
171 | if (mkdtemp(auth_sock_dir) == NULL) { | |
172 | packet_send_debug("Agent forwarding disabled: " | |
173 | "mkdtemp() failed: %.100s", strerror(errno)); | |
174 | restore_uid(); | |
175 | xfree(auth_sock_name); | |
176 | xfree(auth_sock_dir); | |
177 | auth_sock_name = NULL; | |
178 | auth_sock_dir = NULL; | |
179 | return 0; | |
180 | } | |
c457707e | 181 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
182 | auth_sock_dir, (long) getpid()); | |
149cdb60 | 183 | |
149cdb60 | 184 | /* Create the socket. */ |
185 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
186 | if (sock < 0) | |
187 | packet_disconnect("socket: %.100s", strerror(errno)); | |
188 | ||
189 | /* Bind it to the name. */ | |
190 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
191 | sunaddr.sun_family = AF_UNIX; | |
192 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
193 | ||
32596c7b | 194 | if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) |
149cdb60 | 195 | packet_disconnect("bind: %.100s", strerror(errno)); |
196 | ||
197 | /* Restore the privileged uid. */ | |
198 | restore_uid(); | |
199 | ||
200 | /* Start listening on the socket. */ | |
fce39749 | 201 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
149cdb60 | 202 | packet_disconnect("listen: %.100s", strerror(errno)); |
203 | ||
204 | /* Allocate a channel for the authentication agent socket. */ | |
205 | nc = channel_new("auth socket", | |
206 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
207 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 208 | 0, "auth socket", 1); |
149cdb60 | 209 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
210 | return 1; | |
211 | } | |
212 | ||
dd1fb864 | 213 | static void |
214 | display_loginmsg(void) | |
215 | { | |
56964485 | 216 | if (buffer_len(&loginmsg) > 0) { |
217 | buffer_append(&loginmsg, "\0", 1); | |
218 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
219 | buffer_clear(&loginmsg); | |
220 | } | |
dd1fb864 | 221 | } |
149cdb60 | 222 | |
bb5639fe | 223 | void |
224 | do_authenticated(Authctxt *authctxt) | |
225 | { | |
381b021b | 226 | setproctitle("%s", authctxt->pw->pw_name); |
227 | ||
bb5639fe | 228 | /* setup the channel layer */ |
229 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
230 | channel_permit_all_opens(); | |
231 | ||
232 | if (compat20) | |
233 | do_authenticated2(authctxt); | |
234 | else | |
235 | do_authenticated1(authctxt); | |
e4f7282d | 236 | |
2362db19 | 237 | do_cleanup(authctxt); |
bb5639fe | 238 | } |
239 | ||
7368a6c8 | 240 | /* |
241 | * Prepares for an interactive session. This is called after the user has | |
242 | * been successfully authenticated. During this message exchange, pseudo | |
243 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
244 | * are requested, etc. | |
245 | */ | |
396c147e | 246 | static void |
bb5639fe | 247 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 248 | { |
249 | Session *s; | |
7368a6c8 | 250 | char *command; |
54a5250f | 251 | int success, type, screen_flag; |
7138ebd9 | 252 | int enable_compression_after_reply = 0; |
253 | u_int proto_len, data_len, dlen, compression_level = 0; | |
7368a6c8 | 254 | |
255 | s = session_new(); | |
b0042027 | 256 | if (s == NULL) { |
257 | error("no more sessions"); | |
258 | return; | |
259 | } | |
ced49be2 | 260 | s->authctxt = authctxt; |
bb5639fe | 261 | s->pw = authctxt->pw; |
2e73a022 | 262 | |
7368a6c8 | 263 | /* |
264 | * We stay in this loop until the client requests to execute a shell | |
265 | * or a command. | |
266 | */ | |
267 | for (;;) { | |
bb5639fe | 268 | success = 0; |
7368a6c8 | 269 | |
270 | /* Get a packet from the client. */ | |
54a5250f | 271 | type = packet_read(); |
7368a6c8 | 272 | |
273 | /* Process the packet. */ | |
274 | switch (type) { | |
275 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 276 | compression_level = packet_get_int(); |
95500969 | 277 | packet_check_eom(); |
7368a6c8 | 278 | if (compression_level < 1 || compression_level > 9) { |
d77347cc | 279 | packet_send_debug("Received invalid compression level %d.", |
184eed6a | 280 | compression_level); |
7368a6c8 | 281 | break; |
282 | } | |
07200973 | 283 | if (options.compression == COMP_NONE) { |
636f76ca | 284 | debug2("compression disabled"); |
285 | break; | |
286 | } | |
7368a6c8 | 287 | /* Enable compression after we have responded with SUCCESS. */ |
288 | enable_compression_after_reply = 1; | |
289 | success = 1; | |
290 | break; | |
291 | ||
292 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 293 | success = session_pty_req(s); |
7368a6c8 | 294 | break; |
295 | ||
296 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 297 | s->auth_proto = packet_get_string(&proto_len); |
298 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 299 | |
2af09193 | 300 | screen_flag = packet_get_protocol_flags() & |
301 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
302 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
303 | ||
304 | if (packet_remaining() == 4) { | |
305 | if (!screen_flag) | |
306 | debug2("Buggy client: " | |
307 | "X11 screen flag missing"); | |
7368a6c8 | 308 | s->screen = packet_get_int(); |
c8b058b4 | 309 | } else { |
7368a6c8 | 310 | s->screen = 0; |
c8b058b4 | 311 | } |
95500969 | 312 | packet_check_eom(); |
8dcd9d5c | 313 | success = session_setup_x11fwd(s); |
314 | if (!success) { | |
315 | xfree(s->auth_proto); | |
316 | xfree(s->auth_data); | |
1500bcdd | 317 | s->auth_proto = NULL; |
318 | s->auth_data = NULL; | |
7368a6c8 | 319 | } |
7368a6c8 | 320 | break; |
7368a6c8 | 321 | |
322 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
323 | if (no_agent_forwarding_flag || compat13) { | |
324 | debug("Authentication agent forwarding not permitted for this authentication."); | |
325 | break; | |
326 | } | |
327 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 328 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 329 | break; |
330 | ||
331 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
332 | if (no_port_forwarding_flag) { | |
333 | debug("Port forwarding not permitted for this authentication."); | |
334 | break; | |
335 | } | |
33de75a3 | 336 | if (!options.allow_tcp_forwarding) { |
337 | debug("Port forwarding not permitted."); | |
338 | break; | |
339 | } | |
7368a6c8 | 340 | debug("Received TCP/IP port forwarding request."); |
bb5639fe | 341 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 342 | success = 1; |
343 | break; | |
344 | ||
345 | case SSH_CMSG_MAX_PACKET_SIZE: | |
346 | if (packet_set_maxsize(packet_get_int()) > 0) | |
347 | success = 1; | |
348 | break; | |
184eed6a | 349 | |
7368a6c8 | 350 | case SSH_CMSG_EXEC_SHELL: |
351 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 352 | if (type == SSH_CMSG_EXEC_CMD) { |
353 | command = packet_get_string(&dlen); | |
354 | debug("Exec command '%.500s'", command); | |
c95add71 | 355 | do_exec(s, command); |
356 | xfree(command); | |
7368a6c8 | 357 | } else { |
c95add71 | 358 | do_exec(s, NULL); |
7368a6c8 | 359 | } |
95500969 | 360 | packet_check_eom(); |
fc2a1d28 | 361 | session_close(s); |
7368a6c8 | 362 | return; |
363 | ||
364 | default: | |
365 | /* | |
366 | * Any unknown messages in this phase are ignored, | |
367 | * and a failure message is returned. | |
368 | */ | |
bbe88b6d | 369 | logit("Unknown packet type received after authentication: %d", type); |
7368a6c8 | 370 | } |
371 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
372 | packet_send(); | |
373 | packet_write_wait(); | |
374 | ||
375 | /* Enable compression now that we have replied if appropriate. */ | |
376 | if (enable_compression_after_reply) { | |
377 | enable_compression_after_reply = 0; | |
378 | packet_start_compression(compression_level); | |
379 | } | |
380 | } | |
381 | } | |
382 | ||
383 | /* | |
384 | * This is called to fork and execute a command when we have no tty. This | |
385 | * will call do_child from the child, and server_loop from the parent after | |
386 | * setting up file descriptors and such. | |
387 | */ | |
6ae2364d | 388 | void |
65068d16 | 389 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 390 | { |
c457707e | 391 | pid_t pid; |
7368a6c8 | 392 | |
393 | #ifdef USE_PIPES | |
394 | int pin[2], pout[2], perr[2]; | |
395 | /* Allocate pipes for communicating with the program. */ | |
396 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
397 | packet_disconnect("Could not create pipes: %.100s", | |
398 | strerror(errno)); | |
399 | #else /* USE_PIPES */ | |
400 | int inout[2], err[2]; | |
401 | /* Uses socket pairs to communicate with the program. */ | |
402 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
403 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
404 | packet_disconnect("Could not create socket pairs: %.100s", | |
405 | strerror(errno)); | |
406 | #endif /* USE_PIPES */ | |
407 | if (s == NULL) | |
408 | fatal("do_exec_no_pty: no session"); | |
409 | ||
1d1ffb87 | 410 | session_proctitle(s); |
7368a6c8 | 411 | |
b19d61d7 | 412 | #if defined(USE_PAM) |
59f327e0 | 413 | if (options.use_pam && !use_privsep) |
7fceb20d | 414 | do_pam_setcred(1); |
266140a8 | 415 | #endif /* USE_PAM */ |
416 | ||
7368a6c8 | 417 | /* Fork the child. */ |
418 | if ((pid = fork()) == 0) { | |
2362db19 | 419 | is_child = 1; |
516f0d7d | 420 | |
7368a6c8 | 421 | /* Child. Reinitialize the log since the pid has changed. */ |
422 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
423 | ||
424 | /* | |
425 | * Create a new session and process group since the 4.4BSD | |
426 | * setlogin() affects the entire process group. | |
427 | */ | |
428 | if (setsid() < 0) | |
429 | error("setsid failed: %.100s", strerror(errno)); | |
430 | ||
431 | #ifdef USE_PIPES | |
432 | /* | |
433 | * Redirect stdin. We close the parent side of the socket | |
434 | * pair, and make the child side the standard input. | |
435 | */ | |
436 | close(pin[1]); | |
437 | if (dup2(pin[0], 0) < 0) | |
438 | perror("dup2 stdin"); | |
439 | close(pin[0]); | |
440 | ||
441 | /* Redirect stdout. */ | |
442 | close(pout[0]); | |
443 | if (dup2(pout[1], 1) < 0) | |
444 | perror("dup2 stdout"); | |
445 | close(pout[1]); | |
446 | ||
447 | /* Redirect stderr. */ | |
448 | close(perr[0]); | |
449 | if (dup2(perr[1], 2) < 0) | |
450 | perror("dup2 stderr"); | |
451 | close(perr[1]); | |
452 | #else /* USE_PIPES */ | |
453 | /* | |
454 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
455 | * use the same socket, as some programs (particularly rdist) | |
456 | * seem to depend on it. | |
457 | */ | |
458 | close(inout[1]); | |
459 | close(err[1]); | |
460 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
461 | perror("dup2 stdin"); | |
462 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
463 | perror("dup2 stdout"); | |
464 | if (dup2(err[0], 2) < 0) /* stderr */ | |
465 | perror("dup2 stderr"); | |
466 | #endif /* USE_PIPES */ | |
467 | ||
ef51930f | 468 | #ifdef _UNICOS |
469 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
470 | #endif | |
471 | ||
7368a6c8 | 472 | /* Do processing for the child (exec command etc). */ |
56b3e9ce | 473 | do_child(s, command); |
7368a6c8 | 474 | /* NOTREACHED */ |
475 | } | |
ef51930f | 476 | #ifdef _UNICOS |
477 | signal(WJSIGNAL, cray_job_termination_handler); | |
478 | #endif /* _UNICOS */ | |
3c62e7eb | 479 | #ifdef HAVE_CYGWIN |
480 | if (is_winnt) | |
481 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
482 | #endif | |
7368a6c8 | 483 | if (pid < 0) |
484 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
485 | s->pid = pid; | |
b5c334cc | 486 | /* Set interactive/non-interactive mode. */ |
487 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 488 | #ifdef USE_PIPES |
489 | /* We are the parent. Close the child sides of the pipes. */ | |
490 | close(pin[0]); | |
491 | close(pout[1]); | |
492 | close(perr[1]); | |
493 | ||
e78a59f5 | 494 | if (compat20) { |
d7ecbe88 | 495 | if (s->is_subsystem) { |
496 | close(perr[0]); | |
497 | perr[0] = -1; | |
498 | } | |
499 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
e78a59f5 | 500 | } else { |
501 | /* Enter the interactive session. */ | |
502 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 503 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 504 | } |
7368a6c8 | 505 | #else /* USE_PIPES */ |
506 | /* We are the parent. Close the child sides of the socket pairs. */ | |
507 | close(inout[0]); | |
508 | close(err[0]); | |
509 | ||
75dbfa01 | 510 | /* |
511 | * Clear loginmsg, since it's the child's responsibility to display | |
512 | * it to the user, otherwise multiple sessions may accumulate | |
513 | * multiple copies of the login messages. | |
514 | */ | |
515 | buffer_clear(&loginmsg); | |
516 | ||
7368a6c8 | 517 | /* |
518 | * Enter the interactive session. Note: server_loop must be able to | |
519 | * handle the case that fdin and fdout are the same. | |
520 | */ | |
e78a59f5 | 521 | if (compat20) { |
e5d7a405 | 522 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 523 | } else { |
524 | server_loop(pid, inout[1], inout[1], err[1]); | |
525 | /* server_loop has closed inout[1] and err[1]. */ | |
526 | } | |
7368a6c8 | 527 | #endif /* USE_PIPES */ |
528 | } | |
529 | ||
530 | /* | |
531 | * This is called to fork and execute a command when we have a tty. This | |
532 | * will call do_child from the child, and server_loop from the parent after | |
533 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
534 | * lastlog, and other such operations. | |
535 | */ | |
6ae2364d | 536 | void |
65068d16 | 537 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 538 | { |
7368a6c8 | 539 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 540 | pid_t pid; |
7368a6c8 | 541 | |
542 | if (s == NULL) | |
543 | fatal("do_exec_pty: no session"); | |
544 | ptyfd = s->ptyfd; | |
545 | ttyfd = s->ttyfd; | |
546 | ||
b19d61d7 | 547 | #if defined(USE_PAM) |
7fceb20d | 548 | if (options.use_pam) { |
49e82bb9 | 549 | do_pam_set_tty(s->tty); |
72037bc8 | 550 | if (!use_privsep) |
551 | do_pam_setcred(1); | |
7fceb20d | 552 | } |
27cf96de | 553 | #endif |
266140a8 | 554 | |
7368a6c8 | 555 | /* Fork the child. */ |
556 | if ((pid = fork()) == 0) { | |
2362db19 | 557 | is_child = 1; |
57156994 | 558 | |
c345cf9d | 559 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 560 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 561 | /* Close the master side of the pseudo tty. */ |
562 | close(ptyfd); | |
563 | ||
564 | /* Make the pseudo tty our controlling tty. */ | |
565 | pty_make_controlling_tty(&ttyfd, s->tty); | |
566 | ||
05fd093c | 567 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
568 | if (dup2(ttyfd, 0) < 0) | |
569 | error("dup2 stdin: %s", strerror(errno)); | |
570 | if (dup2(ttyfd, 1) < 0) | |
571 | error("dup2 stdout: %s", strerror(errno)); | |
572 | if (dup2(ttyfd, 2) < 0) | |
573 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 574 | |
575 | /* Close the extra descriptor for the pseudo tty. */ | |
576 | close(ttyfd); | |
577 | ||
c345cf9d | 578 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 579 | #ifndef HAVE_OSF_SIA |
ef51930f | 580 | if (!(options.use_login && command == NULL)) { |
581 | #ifdef _UNICOS | |
582 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
583 | #endif /* _UNICOS */ | |
a22aff1f | 584 | do_login(s, command); |
ef51930f | 585 | } |
7e2d5fa4 | 586 | # ifdef LOGIN_NEEDS_UTMPX |
587 | else | |
588 | do_pre_login(s); | |
589 | # endif | |
c96a4aaf | 590 | #endif |
7368a6c8 | 591 | |
7368a6c8 | 592 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 593 | do_child(s, command); |
7368a6c8 | 594 | /* NOTREACHED */ |
595 | } | |
ef51930f | 596 | #ifdef _UNICOS |
597 | signal(WJSIGNAL, cray_job_termination_handler); | |
598 | #endif /* _UNICOS */ | |
3c62e7eb | 599 | #ifdef HAVE_CYGWIN |
600 | if (is_winnt) | |
601 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
602 | #endif | |
7368a6c8 | 603 | if (pid < 0) |
604 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
605 | s->pid = pid; | |
606 | ||
607 | /* Parent. Close the slave side of the pseudo tty. */ | |
608 | close(ttyfd); | |
609 | ||
610 | /* | |
611 | * Create another descriptor of the pty master side for use as the | |
612 | * standard input. We could use the original descriptor, but this | |
613 | * simplifies code in server_loop. The descriptor is bidirectional. | |
614 | */ | |
615 | fdout = dup(ptyfd); | |
616 | if (fdout < 0) | |
617 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
618 | ||
619 | /* we keep a reference to the pty master */ | |
620 | ptymaster = dup(ptyfd); | |
621 | if (ptymaster < 0) | |
622 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
623 | s->ptymaster = ptymaster; | |
624 | ||
625 | /* Enter interactive session. */ | |
b5c334cc | 626 | packet_set_interactive(1); |
e78a59f5 | 627 | if (compat20) { |
628 | session_set_fds(s, ptyfd, fdout, -1); | |
629 | } else { | |
630 | server_loop(pid, ptyfd, fdout, -1); | |
631 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 632 | } |
7368a6c8 | 633 | } |
634 | ||
7e2d5fa4 | 635 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 636 | static void |
7e2d5fa4 | 637 | do_pre_login(Session *s) |
638 | { | |
639 | socklen_t fromlen; | |
640 | struct sockaddr_storage from; | |
641 | pid_t pid = getpid(); | |
642 | ||
643 | /* | |
644 | * Get IP address of client. If the connection is not a socket, let | |
645 | * the address be 0.0.0.0. | |
646 | */ | |
647 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 648 | fromlen = sizeof(from); |
7e2d5fa4 | 649 | if (packet_connection_is_on_socket()) { |
7e2d5fa4 | 650 | if (getpeername(packet_get_connection_in(), |
32596c7b | 651 | (struct sockaddr *)&from, &fromlen) < 0) { |
7e2d5fa4 | 652 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 653 | cleanup_exit(255); |
7e2d5fa4 | 654 | } |
655 | } | |
656 | ||
657 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
c5a7d788 | 658 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d4ac26ed | 659 | (struct sockaddr *)&from, fromlen); |
7e2d5fa4 | 660 | } |
661 | #endif | |
662 | ||
dac6753b | 663 | /* |
664 | * This is called to fork and execute a command. If another command is | |
665 | * to be forced, execute that instead. | |
666 | */ | |
667 | void | |
668 | do_exec(Session *s, const char *command) | |
669 | { | |
670 | if (forced_command) { | |
671 | original_command = command; | |
672 | command = forced_command; | |
dac6753b | 673 | debug("Forced command '%.900s'", command); |
674 | } | |
675 | ||
6039eeef | 676 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 677 | if (command != NULL) |
678 | PRIVSEP(audit_run_command(command)); | |
679 | else if (s->ttyfd == -1) { | |
680 | char *shell = s->pw->pw_shell; | |
681 | ||
682 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
683 | shell =_PATH_BSHELL; | |
684 | PRIVSEP(audit_run_command(shell)); | |
685 | } | |
686 | #endif | |
687 | ||
dac6753b | 688 | if (s->ttyfd != -1) |
689 | do_exec_pty(s, command); | |
690 | else | |
691 | do_exec_no_pty(s, command); | |
692 | ||
c95add71 | 693 | original_command = NULL; |
dac6753b | 694 | |
be2ca0c9 | 695 | /* |
696 | * Clear loginmsg: it's the child's responsibility to display | |
697 | * it to the user, otherwise multiple sessions may accumulate | |
698 | * multiple copies of the login messages. | |
699 | */ | |
700 | buffer_clear(&loginmsg); | |
701 | } | |
f7342052 | 702 | |
c345cf9d | 703 | /* administrative, login(1)-like work */ |
704 | void | |
a22aff1f | 705 | do_login(Session *s, const char *command) |
c345cf9d | 706 | { |
c345cf9d | 707 | socklen_t fromlen; |
708 | struct sockaddr_storage from; | |
c345cf9d | 709 | struct passwd * pw = s->pw; |
710 | pid_t pid = getpid(); | |
711 | ||
712 | /* | |
713 | * Get IP address of client. If the connection is not a socket, let | |
714 | * the address be 0.0.0.0. | |
715 | */ | |
716 | memset(&from, 0, sizeof(from)); | |
d4ac26ed | 717 | fromlen = sizeof(from); |
c345cf9d | 718 | if (packet_connection_is_on_socket()) { |
c345cf9d | 719 | if (getpeername(packet_get_connection_in(), |
f7342052 | 720 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 721 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 722 | cleanup_exit(255); |
c345cf9d | 723 | } |
724 | } | |
725 | ||
726 | /* Record that there was a login on that tty from the remote host. */ | |
49a34e84 | 727 | if (!use_privsep) |
728 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
729 | get_remote_name_or_ip(utmp_len, | |
c5a7d788 | 730 | options.use_dns), |
ba1566dd | 731 | (struct sockaddr *)&from, fromlen); |
c345cf9d | 732 | |
2919e060 | 733 | #ifdef USE_PAM |
734 | /* | |
735 | * If password change is needed, do it now. | |
736 | * This needs to occur before the ~/.hushlogin check. | |
737 | */ | |
dd1fb864 | 738 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
739 | display_loginmsg(); | |
2919e060 | 740 | do_pam_chauthtok(); |
dd1fb864 | 741 | s->authctxt->force_pwchange = 0; |
5b9e2464 | 742 | /* XXX - signal [net] parent to enable forwardings */ |
2919e060 | 743 | } |
744 | #endif | |
745 | ||
f2c2fd71 | 746 | if (check_quietlogin(s, command)) |
c345cf9d | 747 | return; |
748 | ||
dd1fb864 | 749 | display_loginmsg(); |
c345cf9d | 750 | |
f2c2fd71 | 751 | do_motd(); |
752 | } | |
753 | ||
754 | /* | |
755 | * Display the message of the day. | |
756 | */ | |
757 | void | |
758 | do_motd(void) | |
759 | { | |
760 | FILE *f; | |
761 | char buf[256]; | |
762 | ||
c345cf9d | 763 | if (options.print_motd) { |
2e73a022 | 764 | #ifdef HAVE_LOGIN_CAP |
765 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
766 | "/etc/motd"), "r"); | |
767 | #else | |
c345cf9d | 768 | f = fopen("/etc/motd", "r"); |
2e73a022 | 769 | #endif |
c345cf9d | 770 | if (f) { |
771 | while (fgets(buf, sizeof(buf), f)) | |
772 | fputs(buf, stdout); | |
773 | fclose(f); | |
774 | } | |
775 | } | |
776 | } | |
777 | ||
9c328529 | 778 | |
779 | /* | |
780 | * Check for quiet login, either .hushlogin or command given. | |
781 | */ | |
782 | int | |
783 | check_quietlogin(Session *s, const char *command) | |
784 | { | |
785 | char buf[256]; | |
786 | struct passwd *pw = s->pw; | |
787 | struct stat st; | |
788 | ||
789 | /* Return 1 if .hushlogin exists or a command given. */ | |
790 | if (command != NULL) | |
791 | return 1; | |
792 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
793 | #ifdef HAVE_LOGIN_CAP | |
794 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
795 | return 1; | |
796 | #else | |
797 | if (stat(buf, &st) >= 0) | |
798 | return 1; | |
799 | #endif | |
800 | return 0; | |
801 | } | |
802 | ||
7368a6c8 | 803 | /* |
804 | * Sets the value of the given variable in the environment. If the variable | |
805 | * already exists, its value is overriden. | |
806 | */ | |
7364bd04 | 807 | void |
1e3b8b07 | 808 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
184eed6a | 809 | const char *value) |
7368a6c8 | 810 | { |
7368a6c8 | 811 | char **env; |
c46e584f | 812 | u_int envsize; |
813 | u_int i, namelen; | |
7368a6c8 | 814 | |
95b99395 | 815 | /* |
816 | * If we're passed an uninitialized list, allocate a single null | |
817 | * entry before continuing. | |
818 | */ | |
819 | if (*envp == NULL && *envsizep == 0) { | |
820 | *envp = xmalloc(sizeof(char *)); | |
821 | *envp[0] = NULL; | |
822 | *envsizep = 1; | |
823 | } | |
824 | ||
7368a6c8 | 825 | /* |
826 | * Find the slot where the value should be stored. If the variable | |
827 | * already exists, we reuse the slot; otherwise we append a new slot | |
828 | * at the end of the array, expanding if necessary. | |
829 | */ | |
830 | env = *envp; | |
831 | namelen = strlen(name); | |
832 | for (i = 0; env[i]; i++) | |
833 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
834 | break; | |
835 | if (env[i]) { | |
836 | /* Reuse the slot. */ | |
837 | xfree(env[i]); | |
838 | } else { | |
839 | /* New variable. Expand if necessary. */ | |
c46e584f | 840 | envsize = *envsizep; |
841 | if (i >= envsize - 1) { | |
842 | if (envsize >= 1000) | |
843 | fatal("child_set_env: too many env vars"); | |
844 | envsize += 50; | |
c5d10563 | 845 | env = (*envp) = xrealloc(env, envsize, sizeof(char *)); |
c46e584f | 846 | *envsizep = envsize; |
7368a6c8 | 847 | } |
848 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
849 | env[i + 1] = NULL; | |
850 | } | |
851 | ||
852 | /* Allocate space and format the variable in the appropriate slot. */ | |
853 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
854 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
855 | } | |
856 | ||
857 | /* | |
858 | * Reads environment variables from the given file and adds/overrides them | |
859 | * into the environment. If the file does not exist, this does nothing. | |
860 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
861 | * and assignments of the form name=value. No other forms are allowed. | |
862 | */ | |
396c147e | 863 | static void |
1e3b8b07 | 864 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 865 | const char *filename) |
7368a6c8 | 866 | { |
867 | FILE *f; | |
868 | char buf[4096]; | |
869 | char *cp, *value; | |
66087567 | 870 | u_int lineno = 0; |
7368a6c8 | 871 | |
872 | f = fopen(filename, "r"); | |
873 | if (!f) | |
874 | return; | |
875 | ||
876 | while (fgets(buf, sizeof(buf), f)) { | |
66087567 | 877 | if (++lineno > 1000) |
878 | fatal("Too many lines in environment file %s", filename); | |
7368a6c8 | 879 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
880 | ; | |
881 | if (!*cp || *cp == '#' || *cp == '\n') | |
882 | continue; | |
883 | if (strchr(cp, '\n')) | |
884 | *strchr(cp, '\n') = '\0'; | |
885 | value = strchr(cp, '='); | |
886 | if (value == NULL) { | |
66087567 | 887 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
888 | filename); | |
7368a6c8 | 889 | continue; |
890 | } | |
71276795 | 891 | /* |
892 | * Replace the equals sign by nul, and advance value to | |
893 | * the value string. | |
894 | */ | |
7368a6c8 | 895 | *value = '\0'; |
896 | value++; | |
897 | child_set_env(env, envsize, cp, value); | |
898 | } | |
899 | fclose(f); | |
900 | } | |
901 | ||
95b99395 | 902 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
903 | /* | |
904 | * Return named variable from specified environment, or NULL if not present. | |
905 | */ | |
906 | static char * | |
907 | child_get_env(char **env, const char *name) | |
908 | { | |
909 | int i; | |
910 | size_t len; | |
911 | ||
912 | len = strlen(name); | |
913 | for (i=0; env[i] != NULL; i++) | |
914 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
915 | return(env[i] + len + 1); | |
916 | return NULL; | |
917 | } | |
918 | ||
919 | /* | |
920 | * Read /etc/default/login. | |
921 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
922 | */ | |
923 | static void | |
924 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
925 | { | |
926 | char **tmpenv = NULL, *var; | |
6f99680f | 927 | u_int i, tmpenvsize = 0; |
3a23ba0e | 928 | u_long mask; |
95b99395 | 929 | |
930 | /* | |
931 | * We don't want to copy the whole file to the child's environment, | |
932 | * so we use a temporary environment and copy the variables we're | |
933 | * interested in. | |
934 | */ | |
935 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
936 | ||
6f99680f | 937 | if (tmpenv == NULL) |
938 | return; | |
939 | ||
95b99395 | 940 | if (uid == 0) |
941 | var = child_get_env(tmpenv, "SUPATH"); | |
942 | else | |
943 | var = child_get_env(tmpenv, "PATH"); | |
944 | if (var != NULL) | |
945 | child_set_env(env, envsize, "PATH", var); | |
b6453d99 | 946 | |
95b99395 | 947 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
948 | if (sscanf(var, "%5lo", &mask) == 1) | |
3a23ba0e | 949 | umask((mode_t)mask); |
b6453d99 | 950 | |
95b99395 | 951 | for (i = 0; tmpenv[i] != NULL; i++) |
952 | xfree(tmpenv[i]); | |
953 | xfree(tmpenv); | |
954 | } | |
955 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
956 | ||
1db07e7d | 957 | void |
958 | copy_environment(char **source, char ***env, u_int *envsize) | |
7368a6c8 | 959 | { |
760b35a6 | 960 | char *var_name, *var_val; |
7368a6c8 | 961 | int i; |
962 | ||
760b35a6 | 963 | if (source == NULL) |
7368a6c8 | 964 | return; |
2b87da3b | 965 | |
760b35a6 | 966 | for(i = 0; source[i] != NULL; i++) { |
967 | var_name = xstrdup(source[i]); | |
968 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
969 | xfree(var_name); | |
7368a6c8 | 970 | continue; |
7368a6c8 | 971 | } |
760b35a6 | 972 | *var_val++ = '\0'; |
7368a6c8 | 973 | |
760b35a6 | 974 | debug3("Copy environment: %s=%s", var_name, var_val); |
975 | child_set_env(env, envsize, var_name, var_val); | |
b6453d99 | 976 | |
760b35a6 | 977 | xfree(var_name); |
22d89d24 | 978 | } |
979 | } | |
22d89d24 | 980 | |
f7342052 | 981 | static char ** |
982 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 983 | { |
7368a6c8 | 984 | char buf[256]; |
f7342052 | 985 | u_int i, envsize; |
95b99395 | 986 | char **env, *laddr, *path = NULL; |
f7342052 | 987 | struct passwd *pw = s->pw; |
7368a6c8 | 988 | |
7368a6c8 | 989 | /* Initialize the environment. */ |
990 | envsize = 100; | |
01d35895 | 991 | env = xcalloc(envsize, sizeof(char *)); |
7368a6c8 | 992 | env[0] = NULL; |
993 | ||
3c62e7eb | 994 | #ifdef HAVE_CYGWIN |
995 | /* | |
996 | * The Windows environment contains some setting which are | |
997 | * important for a running system. They must not be dropped. | |
998 | */ | |
3c502155 | 999 | { |
1000 | char **p; | |
1001 | ||
1002 | p = fetch_windows_environment(); | |
1003 | copy_environment(p, &env, &envsize); | |
1004 | free_windows_environment(p); | |
1005 | } | |
3c62e7eb | 1006 | #endif |
1007 | ||
7364bd04 | 1008 | #ifdef GSSAPI |
aff51935 | 1009 | /* Allow any GSSAPI methods that we've used to alter |
7364bd04 | 1010 | * the childs environment as they see fit |
1011 | */ | |
1012 | ssh_gssapi_do_child(&env, &envsize); | |
1013 | #endif | |
1014 | ||
7368a6c8 | 1015 | if (!options.use_login) { |
1016 | /* Set basic environment. */ | |
61a2c1da | 1017 | for (i = 0; i < s->num_env; i++) |
f2107e97 | 1018 | child_set_env(&env, &envsize, s->env[i].name, |
61a2c1da | 1019 | s->env[i].val); |
1020 | ||
7368a6c8 | 1021 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1022 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
17ed08c5 | 1023 | #ifdef _AIX |
1024 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1025 | #endif | |
7368a6c8 | 1026 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
2e73a022 | 1027 | #ifdef HAVE_LOGIN_CAP |
97686bf9 | 1028 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1029 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1030 | else | |
1031 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1032 | #else /* HAVE_LOGIN_CAP */ |
1033 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1034 | /* |
1035 | * There's no standard path on Windows. The path contains | |
1036 | * important components pointing to the system directories, | |
1037 | * needed for loading shared libraries. So the path better | |
1038 | * remains intact here. | |
1039 | */ | |
95b99395 | 1040 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1041 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1042 | path = child_get_env(env, "PATH"); | |
1043 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1044 | if (path == NULL || *path == '\0') { | |
aff51935 | 1045 | child_set_env(&env, &envsize, "PATH", |
95b99395 | 1046 | s->pw->pw_uid == 0 ? |
1047 | SUPERUSER_PATH : _PATH_STDPATH); | |
1048 | } | |
22d89d24 | 1049 | # endif /* HAVE_CYGWIN */ |
1050 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1051 | |
1052 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1053 | _PATH_MAILDIR, pw->pw_name); | |
1054 | child_set_env(&env, &envsize, "MAIL", buf); | |
1055 | ||
1056 | /* Normal systems set SHELL by default. */ | |
1057 | child_set_env(&env, &envsize, "SHELL", shell); | |
1058 | } | |
1059 | if (getenv("TZ")) | |
1060 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1061 | ||
1062 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 1063 | if (!options.use_login) { |
1064 | while (custom_environment) { | |
1065 | struct envstring *ce = custom_environment; | |
7fdc56c5 | 1066 | char *str = ce->s; |
f7342052 | 1067 | |
7fdc56c5 | 1068 | for (i = 0; str[i] != '=' && str[i]; i++) |
2548961d | 1069 | ; |
7fdc56c5 | 1070 | if (str[i] == '=') { |
1071 | str[i] = 0; | |
1072 | child_set_env(&env, &envsize, str, str + i + 1); | |
2548961d | 1073 | } |
1074 | custom_environment = ce->next; | |
1075 | xfree(ce->s); | |
1076 | xfree(ce); | |
7368a6c8 | 1077 | } |
7368a6c8 | 1078 | } |
1079 | ||
da0561eb | 1080 | /* SSH_CLIENT deprecated */ |
7368a6c8 | 1081 | snprintf(buf, sizeof buf, "%.50s %d %d", |
f7342052 | 1082 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1083 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1084 | ||
3e2f2431 | 1085 | laddr = get_local_ipaddr(packet_get_connection_in()); |
da0561eb | 1086 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
3e2f2431 | 1087 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1088 | xfree(laddr); | |
da0561eb | 1089 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1090 | ||
56b3e9ce | 1091 | if (s->ttyfd != -1) |
1092 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1093 | if (s->term) | |
1094 | child_set_env(&env, &envsize, "TERM", s->term); | |
1095 | if (s->display) | |
1096 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1097 | if (original_command) |
1098 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1099 | original_command); | |
7368a6c8 | 1100 | |
ef51930f | 1101 | #ifdef _UNICOS |
1102 | if (cray_tmpdir[0] != '\0') | |
1103 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1104 | #endif /* _UNICOS */ | |
1105 | ||
3bfd27d5 | 1106 | /* |
1107 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1108 | * must have been set by a native authentication method (eg AIX or | |
1109 | * SIA), so copy it to the child. | |
1110 | */ | |
1111 | { | |
1112 | char *cp; | |
1113 | ||
1114 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1115 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1116 | } | |
1117 | ||
7368a6c8 | 1118 | #ifdef _AIX |
4936fcee | 1119 | { |
1120 | char *cp; | |
1121 | ||
1122 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1123 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
4936fcee | 1124 | read_environment_file(&env, &envsize, "/etc/environment"); |
1125 | } | |
7368a6c8 | 1126 | #endif |
ced49be2 | 1127 | #ifdef KRB5 |
6490a5d5 | 1128 | if (s->authctxt->krb5_ccname) |
ced49be2 | 1129 | child_set_env(&env, &envsize, "KRB5CCNAME", |
6490a5d5 | 1130 | s->authctxt->krb5_ccname); |
ced49be2 | 1131 | #endif |
7368a6c8 | 1132 | #ifdef USE_PAM |
ee48c949 | 1133 | /* |
1134 | * Pull in any environment variables that may have | |
1135 | * been set by PAM. | |
1136 | */ | |
7fceb20d | 1137 | if (options.use_pam) { |
2212fc98 | 1138 | char **p; |
b6453d99 | 1139 | |
2212fc98 | 1140 | p = fetch_pam_child_environment(); |
1141 | copy_environment(p, &env, &envsize); | |
1142 | free_pam_environment(p); | |
ee48c949 | 1143 | |
2212fc98 | 1144 | p = fetch_pam_environment(); |
ee48c949 | 1145 | copy_environment(p, &env, &envsize); |
1146 | free_pam_environment(p); | |
1147 | } | |
7368a6c8 | 1148 | #endif /* USE_PAM */ |
1149 | ||
149cdb60 | 1150 | if (auth_sock_name != NULL) |
7368a6c8 | 1151 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1152 | auth_sock_name); |
7368a6c8 | 1153 | |
1154 | /* read $HOME/.ssh/environment. */ | |
f00bab84 | 1155 | if (options.permit_user_env && !options.use_login) { |
71276795 | 1156 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e2e36358 | 1157 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
7368a6c8 | 1158 | read_environment_file(&env, &envsize, buf); |
1159 | } | |
1160 | if (debug_flag) { | |
1161 | /* dump the environment */ | |
1162 | fprintf(stderr, "Environment:\n"); | |
1163 | for (i = 0; env[i]; i++) | |
1164 | fprintf(stderr, " %.200s\n", env[i]); | |
1165 | } | |
f7342052 | 1166 | return env; |
1167 | } | |
1168 | ||
1169 | /* | |
1170 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1171 | * first in this order). | |
1172 | */ | |
1173 | static void | |
1174 | do_rc_files(Session *s, const char *shell) | |
1175 | { | |
1176 | FILE *f = NULL; | |
1177 | char cmd[1024]; | |
1178 | int do_xauth; | |
1179 | struct stat st; | |
1180 | ||
1181 | do_xauth = | |
1182 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1183 | ||
1184 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1185 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1186 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1187 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1188 | if (debug_flag) | |
1189 | fprintf(stderr, "Running %s\n", cmd); | |
1190 | f = popen(cmd, "w"); | |
1191 | if (f) { | |
1192 | if (do_xauth) | |
1193 | fprintf(f, "%s %s\n", s->auth_proto, | |
1194 | s->auth_data); | |
1195 | pclose(f); | |
1196 | } else | |
1197 | fprintf(stderr, "Could not run %s\n", | |
1198 | _PATH_SSH_USER_RC); | |
1199 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1200 | if (debug_flag) | |
1201 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1202 | _PATH_SSH_SYSTEM_RC); | |
1203 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1204 | if (f) { | |
1205 | if (do_xauth) | |
1206 | fprintf(f, "%s %s\n", s->auth_proto, | |
1207 | s->auth_data); | |
1208 | pclose(f); | |
1209 | } else | |
1210 | fprintf(stderr, "Could not run %s\n", | |
1211 | _PATH_SSH_SYSTEM_RC); | |
1212 | } else if (do_xauth && options.xauth_location != NULL) { | |
1213 | /* Add authority data to .Xauthority if appropriate. */ | |
1214 | if (debug_flag) { | |
1215 | fprintf(stderr, | |
fe661d8f | 1216 | "Running %.500s remove %.100s\n", |
2362db19 | 1217 | options.xauth_location, s->auth_display); |
fe661d8f | 1218 | fprintf(stderr, |
1219 | "%.500s add %.100s %.100s %.100s\n", | |
f7342052 | 1220 | options.xauth_location, s->auth_display, |
1221 | s->auth_proto, s->auth_data); | |
1222 | } | |
1223 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1224 | options.xauth_location); | |
1225 | f = popen(cmd, "w"); | |
1226 | if (f) { | |
fe661d8f | 1227 | fprintf(f, "remove %s\n", |
1228 | s->auth_display); | |
f7342052 | 1229 | fprintf(f, "add %s %s %s\n", |
1230 | s->auth_display, s->auth_proto, | |
1231 | s->auth_data); | |
1232 | pclose(f); | |
1233 | } else { | |
1234 | fprintf(stderr, "Could not run %s\n", | |
1235 | cmd); | |
1236 | } | |
1237 | } | |
1238 | } | |
1239 | ||
1240 | static void | |
1241 | do_nologin(struct passwd *pw) | |
1242 | { | |
1243 | FILE *f = NULL; | |
1244 | char buf[1024]; | |
1245 | ||
1246 | #ifdef HAVE_LOGIN_CAP | |
1247 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1248 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1249 | _PATH_NOLOGIN), "r"); | |
1250 | #else | |
1251 | if (pw->pw_uid) | |
1252 | f = fopen(_PATH_NOLOGIN, "r"); | |
1253 | #endif | |
1254 | if (f) { | |
1255 | /* /etc/nologin exists. Print its contents and exit. */ | |
bbe88b6d | 1256 | logit("User %.100s not allowed because %s exists", |
8bd4e2ae | 1257 | pw->pw_name, _PATH_NOLOGIN); |
f7342052 | 1258 | while (fgets(buf, sizeof(buf), f)) |
1259 | fputs(buf, stderr); | |
1260 | fclose(f); | |
99f4fb69 | 1261 | fflush(NULL); |
f7342052 | 1262 | exit(254); |
1263 | } | |
1264 | } | |
1265 | ||
1266 | /* Set login name, uid, gid, and groups. */ | |
1853d1ef | 1267 | void |
f7342052 | 1268 | do_setusercontext(struct passwd *pw) |
1269 | { | |
2731632a | 1270 | #ifndef HAVE_CYGWIN |
1271 | if (getuid() == 0 || geteuid() == 0) | |
f7342052 | 1272 | #endif /* HAVE_CYGWIN */ |
2731632a | 1273 | { |
1274 | ||
8bbfc882 | 1275 | #ifdef HAVE_SETPCRED |
166baacc | 1276 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1277 | fatal("Failed to set process credentials"); | |
8bbfc882 | 1278 | #endif /* HAVE_SETPCRED */ |
f7342052 | 1279 | #ifdef HAVE_LOGIN_CAP |
2d199535 | 1280 | # ifdef __bsdi__ |
8695f9f7 | 1281 | setpgid(0, 0); |
2d199535 | 1282 | # endif |
09d7ebd1 | 1283 | #ifdef GSSAPI |
1284 | if (options.gss_authentication) { | |
1285 | temporarily_use_uid(pw); | |
1286 | ssh_gssapi_storecreds(); | |
1287 | restore_uid(); | |
1288 | } | |
1289 | #endif | |
f4eaee12 | 1290 | # ifdef USE_PAM |
1291 | if (options.use_pam) { | |
1292 | do_pam_session(); | |
1293 | do_pam_setcred(0); | |
1294 | } | |
1295 | # endif /* USE_PAM */ | |
f7342052 | 1296 | if (setusercontext(lc, pw, pw->pw_uid, |
1297 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1298 | perror("unable to set user context"); | |
1299 | exit(1); | |
1300 | } | |
1301 | #else | |
1302 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1303 | /* Sets login uid for accounting */ | |
1304 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1305 | error("setluid: %s", strerror(errno)); | |
1306 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1307 | ||
1308 | if (setlogin(pw->pw_name) < 0) | |
1309 | error("setlogin failed: %s", strerror(errno)); | |
1310 | if (setgid(pw->pw_gid) < 0) { | |
1311 | perror("setgid"); | |
1312 | exit(1); | |
1313 | } | |
1314 | /* Initialize the group list. */ | |
1315 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1316 | perror("initgroups"); | |
1317 | exit(1); | |
1318 | } | |
1319 | endgrent(); | |
09d7ebd1 | 1320 | #ifdef GSSAPI |
1321 | if (options.gss_authentication) { | |
1322 | temporarily_use_uid(pw); | |
1323 | ssh_gssapi_storecreds(); | |
1324 | restore_uid(); | |
1325 | } | |
1326 | #endif | |
f7342052 | 1327 | # ifdef USE_PAM |
1328 | /* | |
aff51935 | 1329 | * PAM credentials may take the form of supplementary groups. |
f7342052 | 1330 | * These will have been wiped by the above initgroups() call. |
1331 | * Reestablish them here. | |
1332 | */ | |
49e82bb9 | 1333 | if (options.use_pam) { |
1334 | do_pam_session(); | |
7fceb20d | 1335 | do_pam_setcred(0); |
49e82bb9 | 1336 | } |
f7342052 | 1337 | # endif /* USE_PAM */ |
1338 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1339 | irix_setusercontext(pw); | |
1340 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
e2bc41f9 | 1341 | # ifdef _AIX |
0ba40daa | 1342 | aix_usrinfo(pw); |
e2bc41f9 | 1343 | # endif /* _AIX */ |
26d07095 | 1344 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
4c653d8e | 1345 | if (set_id(pw->pw_name) != 0) { |
1346 | exit(1); | |
1347 | } | |
26d07095 | 1348 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ |
f7342052 | 1349 | /* Permanently switch to the desired uid. */ |
1350 | permanently_set_uid(pw); | |
1351 | #endif | |
1352 | } | |
2731632a | 1353 | |
1354 | #ifdef HAVE_CYGWIN | |
1355 | if (is_winnt) | |
1356 | #endif | |
f7342052 | 1357 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1358 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
ef4d1846 | 1359 | |
1360 | #ifdef WITH_SELINUX | |
1361 | ssh_selinux_setup_exec_context(pw->pw_name); | |
1362 | #endif | |
f7342052 | 1363 | } |
1364 | ||
37656beb | 1365 | static void |
1366 | do_pwchange(Session *s) | |
1367 | { | |
be2ca0c9 | 1368 | fflush(NULL); |
37656beb | 1369 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1370 | if (s->ttyfd != -1) { | |
f2107e97 | 1371 | fprintf(stderr, |
37656beb | 1372 | "You must change your password now and login again!\n"); |
3ade3b57 | 1373 | #ifdef PASSWD_NEEDS_USERNAME |
1374 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1375 | (char *)NULL); | |
1376 | #else | |
37656beb | 1377 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
3ade3b57 | 1378 | #endif |
37656beb | 1379 | perror("passwd"); |
1380 | } else { | |
1381 | fprintf(stderr, | |
1382 | "Password change required but no TTY available.\n"); | |
1383 | } | |
1384 | exit(1); | |
1385 | } | |
1386 | ||
51aeb639 | 1387 | static void |
1853d1ef | 1388 | launch_login(struct passwd *pw, const char *hostname) |
1389 | { | |
1390 | /* Launch login(1). */ | |
1391 | ||
85cc9118 | 1392 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1393 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1394 | (s->term ? s->term : "unknown"), |
1853d1ef | 1395 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1396 | #ifdef LOGIN_NO_ENDOPT |
1397 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1398 | #else | |
1853d1ef | 1399 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1400 | #endif |
1853d1ef | 1401 | |
1402 | /* Login couldn't be executed, die. */ | |
1403 | ||
1404 | perror("login"); | |
1405 | exit(1); | |
1406 | } | |
1407 | ||
37656beb | 1408 | static void |
1409 | child_close_fds(void) | |
1410 | { | |
1411 | int i; | |
1412 | ||
1413 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1414 | close(packet_get_connection_in()); | |
1415 | else { | |
1416 | close(packet_get_connection_in()); | |
1417 | close(packet_get_connection_out()); | |
1418 | } | |
1419 | /* | |
1420 | * Close all descriptors related to channels. They will still remain | |
1421 | * open in the parent. | |
1422 | */ | |
1423 | /* XXX better use close-on-exec? -markus */ | |
1424 | channel_close_all(); | |
1425 | ||
1426 | /* | |
1427 | * Close any extra file descriptors. Note that there may still be | |
1428 | * descriptors left by system functions. They will be closed later. | |
1429 | */ | |
1430 | endpwent(); | |
1431 | ||
1432 | /* | |
7b9b0103 | 1433 | * Close any extra open file descriptors so that we don't have them |
37656beb | 1434 | * hanging around in clients. Note that we want to do this after |
1435 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1436 | * descriptors open. | |
1437 | */ | |
1438 | for (i = 3; i < 64; i++) | |
1439 | close(i); | |
1440 | } | |
1441 | ||
f7342052 | 1442 | /* |
1443 | * Performs common processing for the child, such as setting up the | |
1444 | * environment, closing extra file descriptors, setting the user and group | |
1445 | * ids, and executing the command or shell. | |
1446 | */ | |
1447 | void | |
1448 | do_child(Session *s, const char *command) | |
1449 | { | |
1450 | extern char **environ; | |
1451 | char **env; | |
1452 | char *argv[10]; | |
1453 | const char *shell, *shell0, *hostname = NULL; | |
1454 | struct passwd *pw = s->pw; | |
f7342052 | 1455 | |
1456 | /* remove hostkey from the child's memory */ | |
1457 | destroy_sensitive_data(); | |
1458 | ||
37656beb | 1459 | /* Force a password change */ |
1460 | if (s->authctxt->force_pwchange) { | |
1461 | do_setusercontext(pw); | |
1462 | child_close_fds(); | |
1463 | do_pwchange(s); | |
1464 | exit(1); | |
1465 | } | |
1466 | ||
f7342052 | 1467 | /* login(1) is only called if we execute the login shell */ |
1468 | if (options.use_login && command != NULL) | |
1469 | options.use_login = 0; | |
1470 | ||
ef51930f | 1471 | #ifdef _UNICOS |
1472 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1473 | #endif /* _UNICOS */ | |
1474 | ||
f7342052 | 1475 | /* |
1476 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1477 | * switch, so we let login(1) to this for us. | |
1478 | */ | |
1479 | if (!options.use_login) { | |
1480 | #ifdef HAVE_OSF_SIA | |
58d0df4e | 1481 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
f7342052 | 1482 | if (!check_quietlogin(s, command)) |
1483 | do_motd(); | |
1484 | #else /* HAVE_OSF_SIA */ | |
0a61a240 | 1485 | /* When PAM is enabled we rely on it to do the nologin check */ |
1486 | if (!options.use_pam) | |
1487 | do_nologin(pw); | |
f7342052 | 1488 | do_setusercontext(pw); |
25bfd4ff | 1489 | /* |
1490 | * PAM session modules in do_setusercontext may have | |
1491 | * generated messages, so if this in an interactive | |
1492 | * login then display them too. | |
1493 | */ | |
d0c890ac | 1494 | if (!check_quietlogin(s, command)) |
25bfd4ff | 1495 | display_loginmsg(); |
f7342052 | 1496 | #endif /* HAVE_OSF_SIA */ |
1497 | } | |
1498 | ||
abdec250 | 1499 | #ifdef USE_PAM |
d9720710 | 1500 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1501 | debug3("PAM session not opened, exiting"); | |
abdec250 | 1502 | display_loginmsg(); |
1503 | exit(254); | |
1504 | } | |
1505 | #endif | |
1506 | ||
f7342052 | 1507 | /* |
1508 | * Get the shell from the password data. An empty shell field is | |
1509 | * legal, and means /bin/sh. | |
1510 | */ | |
1511 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
32214c88 | 1512 | |
1513 | /* | |
1514 | * Make sure $SHELL points to the shell from the password file, | |
1515 | * even if shell is overridden from login.conf | |
1516 | */ | |
1517 | env = do_setup_env(s, shell); | |
1518 | ||
f7342052 | 1519 | #ifdef HAVE_LOGIN_CAP |
1520 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1521 | #endif | |
1522 | ||
2e73a022 | 1523 | /* we have to stash the hostname before we close our socket. */ |
1524 | if (options.use_login) | |
46e3af7f | 1525 | hostname = get_remote_name_or_ip(utmp_len, |
c5a7d788 | 1526 | options.use_dns); |
7368a6c8 | 1527 | /* |
1528 | * Close the connection descriptors; note that this is the child, and | |
1529 | * the server will still have the socket open, and it is important | |
1530 | * that we do not shutdown it. Note that the descriptors cannot be | |
1531 | * closed before building the environment, as we call | |
1532 | * get_remote_ipaddr there. | |
1533 | */ | |
37656beb | 1534 | child_close_fds(); |
7368a6c8 | 1535 | |
7368a6c8 | 1536 | /* |
2a8a6488 | 1537 | * Must take new environment into use so that .ssh/rc, |
1538 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1539 | */ |
1540 | environ = env; | |
1541 | ||
bcfcc5f9 | 1542 | #if defined(KRB5) && defined(USE_AFS) |
a1e30b47 | 1543 | /* |
1544 | * At this point, we check to see if AFS is active and if we have | |
1545 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1546 | * if we can (and need to) extend the ticket into an AFS token. If | |
1547 | * we don't do this, we run into potential problems if the user's | |
1548 | * home directory is in AFS and it's not world-readable. | |
1549 | */ | |
1550 | ||
1551 | if (options.kerberos_get_afs_token && k_hasafs() && | |
4e2e5cfd | 1552 | (s->authctxt->krb5_ctx != NULL)) { |
a1e30b47 | 1553 | char cell[64]; |
1554 | ||
1555 | debug("Getting AFS token"); | |
1556 | ||
1557 | k_setpag(); | |
1558 | ||
1559 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1560 | krb5_afslog(s->authctxt->krb5_ctx, | |
1561 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1562 | ||
1563 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1564 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1565 | } | |
1566 | #endif | |
1567 | ||
7b9b0103 | 1568 | /* Change current directory to the user's home directory. */ |
dab89049 | 1569 | if (chdir(pw->pw_dir) < 0) { |
1570 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1571 | pw->pw_dir, strerror(errno)); | |
1572 | #ifdef HAVE_LOGIN_CAP | |
1573 | if (login_getcapbool(lc, "requirehome", 0)) | |
1574 | exit(1); | |
1575 | #endif | |
1576 | } | |
1577 | ||
f7342052 | 1578 | if (!options.use_login) |
1579 | do_rc_files(s, shell); | |
1d3c30db | 1580 | |
1581 | /* restore SIGPIPE for child */ | |
1582 | signal(SIGPIPE, SIG_DFL); | |
1583 | ||
f7342052 | 1584 | if (options.use_login) { |
1853d1ef | 1585 | launch_login(pw, hostname); |
1586 | /* NEVERREACHED */ | |
f7342052 | 1587 | } |
1588 | ||
1589 | /* Get the last component of the shell name. */ | |
1590 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1591 | shell0++; | |
1592 | else | |
1593 | shell0 = shell; | |
1594 | ||
7368a6c8 | 1595 | /* |
1596 | * If we have no command, execute the shell. In this case, the shell | |
1597 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1598 | * this is a login shell. | |
1599 | */ | |
1600 | if (!command) { | |
f7342052 | 1601 | char argv0[256]; |
7368a6c8 | 1602 | |
f7342052 | 1603 | /* Start the shell. Set initial character to '-'. */ |
1604 | argv0[0] = '-'; | |
7368a6c8 | 1605 | |
f7342052 | 1606 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1607 | >= sizeof(argv0) - 1) { | |
1608 | errno = EINVAL; | |
7368a6c8 | 1609 | perror(shell); |
1610 | exit(1); | |
f7342052 | 1611 | } |
7368a6c8 | 1612 | |
f7342052 | 1613 | /* Execute the shell. */ |
1614 | argv[0] = argv0; | |
1615 | argv[1] = NULL; | |
1616 | execve(shell, argv, env); | |
7368a6c8 | 1617 | |
f7342052 | 1618 | /* Executing the shell failed. */ |
1619 | perror(shell); | |
1620 | exit(1); | |
7368a6c8 | 1621 | } |
1622 | /* | |
1623 | * Execute the command using the user's shell. This uses the -c | |
1624 | * option to execute the command. | |
1625 | */ | |
f7342052 | 1626 | argv[0] = (char *) shell0; |
7368a6c8 | 1627 | argv[1] = "-c"; |
1628 | argv[2] = (char *) command; | |
1629 | argv[3] = NULL; | |
1630 | execve(shell, argv, env); | |
1631 | perror(shell); | |
1632 | exit(1); | |
1633 | } | |
1634 | ||
1635 | Session * | |
1636 | session_new(void) | |
1637 | { | |
1638 | int i; | |
1639 | static int did_init = 0; | |
1640 | if (!did_init) { | |
1641 | debug("session_new: init"); | |
184eed6a | 1642 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1643 | sessions[i].used = 0; |
7368a6c8 | 1644 | } |
1645 | did_init = 1; | |
1646 | } | |
184eed6a | 1647 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1648 | Session *s = &sessions[i]; |
1649 | if (! s->used) { | |
690d0d7f | 1650 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1651 | s->chanid = -1; |
1652 | s->ptyfd = -1; | |
1653 | s->ttyfd = -1; | |
7368a6c8 | 1654 | s->used = 1; |
86066315 | 1655 | s->self = i; |
d08341e6 | 1656 | s->x11_chanids = NULL; |
02323c45 | 1657 | debug("session_new: session %d", i); |
7368a6c8 | 1658 | return s; |
1659 | } | |
1660 | } | |
1661 | return NULL; | |
1662 | } | |
1663 | ||
396c147e | 1664 | static void |
7368a6c8 | 1665 | session_dump(void) |
1666 | { | |
1667 | int i; | |
184eed6a | 1668 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1669 | Session *s = &sessions[i]; |
c457707e | 1670 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1671 | s->used, |
1672 | s->self, | |
1673 | s, | |
1674 | s->chanid, | |
c457707e | 1675 | (long)s->pid); |
7368a6c8 | 1676 | } |
1677 | } | |
1678 | ||
e78a59f5 | 1679 | int |
57156994 | 1680 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1681 | { |
1682 | Session *s = session_new(); | |
1683 | debug("session_open: channel %d", chanid); | |
1684 | if (s == NULL) { | |
1685 | error("no more sessions"); | |
1686 | return 0; | |
1687 | } | |
57156994 | 1688 | s->authctxt = authctxt; |
1689 | s->pw = authctxt->pw; | |
fdaef11e | 1690 | if (s->pw == NULL || !authctxt->valid) |
0725ea77 | 1691 | fatal("no user for session %d", s->self); |
0b242b12 | 1692 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1693 | s->chanid = chanid; | |
e78a59f5 | 1694 | return 1; |
1695 | } | |
1696 | ||
1853d1ef | 1697 | Session * |
1698 | session_by_tty(char *tty) | |
1699 | { | |
1700 | int i; | |
1701 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1702 | Session *s = &sessions[i]; | |
1703 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1704 | debug("session_by_tty: session %d tty %s", i, tty); | |
1705 | return s; | |
1706 | } | |
1707 | } | |
1708 | debug("session_by_tty: unknown tty %.100s", tty); | |
1709 | session_dump(); | |
1710 | return NULL; | |
1711 | } | |
1712 | ||
396c147e | 1713 | static Session * |
e78a59f5 | 1714 | session_by_channel(int id) |
1715 | { | |
1716 | int i; | |
184eed6a | 1717 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1718 | Session *s = &sessions[i]; |
1719 | if (s->used && s->chanid == id) { | |
1720 | debug("session_by_channel: session %d channel %d", i, id); | |
1721 | return s; | |
1722 | } | |
1723 | } | |
1724 | debug("session_by_channel: unknown channel %d", id); | |
1725 | session_dump(); | |
1726 | return NULL; | |
1727 | } | |
1728 | ||
d08341e6 | 1729 | static Session * |
1730 | session_by_x11_channel(int id) | |
1731 | { | |
1732 | int i, j; | |
1733 | ||
1734 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1735 | Session *s = &sessions[i]; | |
1736 | ||
1737 | if (s->x11_chanids == NULL || !s->used) | |
1738 | continue; | |
1739 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
1740 | if (s->x11_chanids[j] == id) { | |
1741 | debug("session_by_x11_channel: session %d " | |
1742 | "channel %d", s->self, id); | |
1743 | return s; | |
1744 | } | |
1745 | } | |
1746 | } | |
1747 | debug("session_by_x11_channel: unknown channel %d", id); | |
1748 | session_dump(); | |
1749 | return NULL; | |
1750 | } | |
1751 | ||
396c147e | 1752 | static Session * |
e78a59f5 | 1753 | session_by_pid(pid_t pid) |
1754 | { | |
1755 | int i; | |
c457707e | 1756 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1757 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1758 | Session *s = &sessions[i]; |
1759 | if (s->used && s->pid == pid) | |
1760 | return s; | |
1761 | } | |
c457707e | 1762 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1763 | session_dump(); |
1764 | return NULL; | |
1765 | } | |
1766 | ||
396c147e | 1767 | static int |
e78a59f5 | 1768 | session_window_change_req(Session *s) |
1769 | { | |
1770 | s->col = packet_get_int(); | |
1771 | s->row = packet_get_int(); | |
1772 | s->xpixel = packet_get_int(); | |
1773 | s->ypixel = packet_get_int(); | |
95500969 | 1774 | packet_check_eom(); |
e78a59f5 | 1775 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1776 | return 1; | |
1777 | } | |
1778 | ||
396c147e | 1779 | static int |
e78a59f5 | 1780 | session_pty_req(Session *s) |
1781 | { | |
1e3b8b07 | 1782 | u_int len; |
30dcc918 | 1783 | int n_bytes; |
762715ce | 1784 | |
653d5f86 | 1785 | if (no_pty_flag) { |
1786 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1787 | return 0; |
653d5f86 | 1788 | } |
1789 | if (s->ttyfd != -1) { | |
1790 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1791 | return 0; |
653d5f86 | 1792 | } |
1793 | ||
e78a59f5 | 1794 | s->term = packet_get_string(&len); |
653d5f86 | 1795 | |
1796 | if (compat20) { | |
1797 | s->col = packet_get_int(); | |
1798 | s->row = packet_get_int(); | |
1799 | } else { | |
1800 | s->row = packet_get_int(); | |
1801 | s->col = packet_get_int(); | |
1802 | } | |
e78a59f5 | 1803 | s->xpixel = packet_get_int(); |
1804 | s->ypixel = packet_get_int(); | |
1805 | ||
1806 | if (strcmp(s->term, "") == 0) { | |
1807 | xfree(s->term); | |
1808 | s->term = NULL; | |
1809 | } | |
653d5f86 | 1810 | |
e78a59f5 | 1811 | /* Allocate a pty and open it. */ |
653d5f86 | 1812 | debug("Allocating pty."); |
1853d1ef | 1813 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1814 | if (s->term) |
1815 | xfree(s->term); | |
e78a59f5 | 1816 | s->term = NULL; |
1817 | s->ptyfd = -1; | |
1818 | s->ttyfd = -1; | |
1819 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1820 | return 0; |
e78a59f5 | 1821 | } |
1822 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1823 | |
1824 | /* for SSH1 the tty modes length is not given */ | |
1825 | if (!compat20) | |
1826 | n_bytes = packet_remaining(); | |
1827 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1828 | ||
1853d1ef | 1829 | if (!use_privsep) |
1830 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1831 | |
1832 | /* Set window size from the packet. */ | |
e78a59f5 | 1833 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1834 | ||
95500969 | 1835 | packet_check_eom(); |
1d1ffb87 | 1836 | session_proctitle(s); |
e78a59f5 | 1837 | return 1; |
1838 | } | |
1839 | ||
396c147e | 1840 | static int |
0b242b12 | 1841 | session_subsystem_req(Session *s) |
1842 | { | |
01855277 | 1843 | struct stat st; |
1e3b8b07 | 1844 | u_int len; |
0b242b12 | 1845 | int success = 0; |
d66ce1a1 | 1846 | char *prog, *cmd, *subsys = packet_get_string(&len); |
2ceb8101 | 1847 | u_int i; |
0b242b12 | 1848 | |
95500969 | 1849 | packet_check_eom(); |
bbe88b6d | 1850 | logit("subsystem request for %.100s", subsys); |
0b242b12 | 1851 | |
38c295d6 | 1852 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1853 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
d66ce1a1 | 1854 | prog = options.subsystem_command[i]; |
1855 | cmd = options.subsystem_args[i]; | |
1856 | if (stat(prog, &st) < 0) { | |
1857 | error("subsystem: cannot stat %s: %s", prog, | |
01855277 | 1858 | strerror(errno)); |
1859 | break; | |
1860 | } | |
1861 | debug("subsystem: exec() %s", cmd); | |
e5d7a405 | 1862 | s->is_subsystem = 1; |
01855277 | 1863 | do_exec(s, cmd); |
38c295d6 | 1864 | success = 1; |
24932ee9 | 1865 | break; |
38c295d6 | 1866 | } |
1867 | } | |
1868 | ||
1869 | if (!success) | |
bbe88b6d | 1870 | logit("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1871 | subsys); |
38c295d6 | 1872 | |
0b242b12 | 1873 | xfree(subsys); |
1874 | return success; | |
1875 | } | |
1876 | ||
396c147e | 1877 | static int |
0b242b12 | 1878 | session_x11_req(Session *s) |
1879 | { | |
8dcd9d5c | 1880 | int success; |
0b242b12 | 1881 | |
d08341e6 | 1882 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
1883 | error("session_x11_req: session %d: " | |
8918b906 | 1884 | "x11 forwarding already active", s->self); |
d08341e6 | 1885 | return 0; |
1886 | } | |
0b242b12 | 1887 | s->single_connection = packet_get_char(); |
1888 | s->auth_proto = packet_get_string(NULL); | |
1889 | s->auth_data = packet_get_string(NULL); | |
1890 | s->screen = packet_get_int(); | |
95500969 | 1891 | packet_check_eom(); |
0b242b12 | 1892 | |
8dcd9d5c | 1893 | success = session_setup_x11fwd(s); |
1894 | if (!success) { | |
0b242b12 | 1895 | xfree(s->auth_proto); |
1896 | xfree(s->auth_data); | |
1500bcdd | 1897 | s->auth_proto = NULL; |
1898 | s->auth_data = NULL; | |
0b242b12 | 1899 | } |
8dcd9d5c | 1900 | return success; |
0b242b12 | 1901 | } |
1902 | ||
396c147e | 1903 | static int |
38c295d6 | 1904 | session_shell_req(Session *s) |
1905 | { | |
95500969 | 1906 | packet_check_eom(); |
dac6753b | 1907 | do_exec(s, NULL); |
38c295d6 | 1908 | return 1; |
1909 | } | |
1910 | ||
396c147e | 1911 | static int |
38c295d6 | 1912 | session_exec_req(Session *s) |
1913 | { | |
1e3b8b07 | 1914 | u_int len; |
38c295d6 | 1915 | char *command = packet_get_string(&len); |
95500969 | 1916 | packet_check_eom(); |
dac6753b | 1917 | do_exec(s, command); |
c95add71 | 1918 | xfree(command); |
38c295d6 | 1919 | return 1; |
1920 | } | |
1921 | ||
16a79097 | 1922 | static int |
1923 | session_break_req(Session *s) | |
1924 | { | |
16a79097 | 1925 | |
f6be21a0 | 1926 | packet_get_int(); /* ignored */ |
16a79097 | 1927 | packet_check_eom(); |
1928 | ||
8168a86a | 1929 | if (s->ttyfd == -1 || |
1930 | tcsendbreak(s->ttyfd, 0) < 0) | |
16a79097 | 1931 | return 0; |
16a79097 | 1932 | return 1; |
1933 | } | |
1934 | ||
61a2c1da | 1935 | static int |
1936 | session_env_req(Session *s) | |
1937 | { | |
1938 | char *name, *val; | |
1939 | u_int name_len, val_len, i; | |
1940 | ||
1941 | name = packet_get_string(&name_len); | |
1942 | val = packet_get_string(&val_len); | |
1943 | packet_check_eom(); | |
1944 | ||
1945 | /* Don't set too many environment variables */ | |
1946 | if (s->num_env > 128) { | |
1947 | debug2("Ignoring env request %s: too many env vars", name); | |
1948 | goto fail; | |
1949 | } | |
1950 | ||
1951 | for (i = 0; i < options.num_accept_env; i++) { | |
1952 | if (match_pattern(name, options.accept_env[i])) { | |
1953 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
c5d10563 | 1954 | s->env = xrealloc(s->env, s->num_env + 1, |
1955 | sizeof(*s->env)); | |
61a2c1da | 1956 | s->env[s->num_env].name = name; |
1957 | s->env[s->num_env].val = val; | |
1958 | s->num_env++; | |
1959 | return (1); | |
1960 | } | |
1961 | } | |
1962 | debug2("Ignoring env request %s: disallowed name", name); | |
1963 | ||
1964 | fail: | |
1965 | xfree(name); | |
1966 | xfree(val); | |
1967 | return (0); | |
1968 | } | |
1969 | ||
396c147e | 1970 | static int |
fa08c86b | 1971 | session_auth_agent_req(Session *s) |
1972 | { | |
1973 | static int called = 0; | |
95500969 | 1974 | packet_check_eom(); |
d343d900 | 1975 | if (no_agent_forwarding_flag) { |
1976 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1977 | return 0; | |
1978 | } | |
fa08c86b | 1979 | if (called) { |
1980 | return 0; | |
1981 | } else { | |
1982 | called = 1; | |
1983 | return auth_input_request_forwarding(s->pw); | |
1984 | } | |
1985 | } | |
1986 | ||
7899c98f | 1987 | int |
1988 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 1989 | { |
e78a59f5 | 1990 | int success = 0; |
e78a59f5 | 1991 | Session *s; |
e78a59f5 | 1992 | |
7899c98f | 1993 | if ((s = session_by_channel(c->self)) == NULL) { |
bbe88b6d | 1994 | logit("session_input_channel_req: no session %d req %.100s", |
7899c98f | 1995 | c->self, rtype); |
1996 | return 0; | |
1997 | } | |
1998 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 1999 | |
2000 | /* | |
e5d7a405 | 2001 | * a session is in LARVAL state until a shell, a command |
2002 | * or a subsystem is executed | |
e78a59f5 | 2003 | */ |
2004 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2005 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 2006 | success = session_shell_req(s); |
e78a59f5 | 2007 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 2008 | success = session_exec_req(s); |
e78a59f5 | 2009 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 2010 | success = session_pty_req(s); |
0b242b12 | 2011 | } else if (strcmp(rtype, "x11-req") == 0) { |
2012 | success = session_x11_req(s); | |
fa08c86b | 2013 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
2014 | success = session_auth_agent_req(s); | |
0b242b12 | 2015 | } else if (strcmp(rtype, "subsystem") == 0) { |
2016 | success = session_subsystem_req(s); | |
61a2c1da | 2017 | } else if (strcmp(rtype, "env") == 0) { |
2018 | success = session_env_req(s); | |
e78a59f5 | 2019 | } |
2020 | } | |
2021 | if (strcmp(rtype, "window-change") == 0) { | |
2022 | success = session_window_change_req(s); | |
c6c76c99 | 2023 | } else if (strcmp(rtype, "break") == 0) { |
2024 | success = session_break_req(s); | |
e78a59f5 | 2025 | } |
c6c76c99 | 2026 | |
7899c98f | 2027 | return success; |
e78a59f5 | 2028 | } |
2029 | ||
2030 | void | |
2031 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2032 | { | |
2033 | if (!compat20) | |
2034 | fatal("session_set_fds: called for proto != 2.0"); | |
2035 | /* | |
2036 | * now that have a child and a pipe to the child, | |
2037 | * we can activate our channel and register the fd's | |
2038 | */ | |
2039 | if (s->chanid == -1) | |
2040 | fatal("no channel for session %d", s->self); | |
2041 | channel_set_fds(s->chanid, | |
2042 | fdout, fdin, fderr, | |
a22aff1f | 2043 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 2044 | 1, |
2045 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 2046 | } |
2047 | ||
86066315 | 2048 | /* |
2049 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2050 | * (e.g., due to a dropped connection). | |
2051 | */ | |
1853d1ef | 2052 | void |
2362db19 | 2053 | session_pty_cleanup2(Session *s) |
7368a6c8 | 2054 | { |
86066315 | 2055 | if (s == NULL) { |
2056 | error("session_pty_cleanup: no session"); | |
2057 | return; | |
2058 | } | |
2059 | if (s->ttyfd == -1) | |
7368a6c8 | 2060 | return; |
2061 | ||
0725ea77 | 2062 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 2063 | |
7368a6c8 | 2064 | /* Record that the user has logged out. */ |
86066315 | 2065 | if (s->pid != 0) |
f3837bc6 | 2066 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 2067 | |
2068 | /* Release the pseudo-tty. */ | |
1853d1ef | 2069 | if (getuid() == 0) |
2070 | pty_release(s->tty); | |
7368a6c8 | 2071 | |
2072 | /* | |
2073 | * Close the server side of the socket pairs. We must do this after | |
2074 | * the pty cleanup, so that another process doesn't get this pty | |
2075 | * while we're still cleaning up. | |
2076 | */ | |
2077 | if (close(s->ptymaster) < 0) | |
1853d1ef | 2078 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 2079 | |
2080 | /* unlink pty from session */ | |
2081 | s->ttyfd = -1; | |
7368a6c8 | 2082 | } |
e78a59f5 | 2083 | |
1853d1ef | 2084 | void |
2362db19 | 2085 | session_pty_cleanup(Session *s) |
1853d1ef | 2086 | { |
2362db19 | 2087 | PRIVSEP(session_pty_cleanup2(s)); |
1853d1ef | 2088 | } |
2089 | ||
6c723e7c | 2090 | static char * |
2091 | sig2name(int sig) | |
2092 | { | |
2093 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2094 | SSH_SIG(ABRT); | |
2095 | SSH_SIG(ALRM); | |
2096 | SSH_SIG(FPE); | |
2097 | SSH_SIG(HUP); | |
2098 | SSH_SIG(ILL); | |
2099 | SSH_SIG(INT); | |
2100 | SSH_SIG(KILL); | |
2101 | SSH_SIG(PIPE); | |
2102 | SSH_SIG(QUIT); | |
2103 | SSH_SIG(SEGV); | |
2104 | SSH_SIG(TERM); | |
2105 | SSH_SIG(USR1); | |
2106 | SSH_SIG(USR2); | |
2107 | #undef SSH_SIG | |
2108 | return "SIG@openssh.com"; | |
2109 | } | |
2110 | ||
d08341e6 | 2111 | static void |
2112 | session_close_x11(int id) | |
2113 | { | |
2114 | Channel *c; | |
2115 | ||
b872f7f0 | 2116 | if ((c = channel_by_id(id)) == NULL) { |
d08341e6 | 2117 | debug("session_close_x11: x11 channel %d missing", id); |
2118 | } else { | |
2119 | /* Detach X11 listener */ | |
2120 | debug("session_close_x11: detach x11 channel %d", id); | |
2121 | channel_cancel_cleanup(id); | |
2122 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2123 | chan_mark_dead(c); | |
2124 | } | |
2125 | } | |
2126 | ||
2127 | static void | |
2128 | session_close_single_x11(int id, void *arg) | |
2129 | { | |
2130 | Session *s; | |
2131 | u_int i; | |
2132 | ||
2133 | debug3("session_close_single_x11: channel %d", id); | |
2134 | channel_cancel_cleanup(id); | |
2135 | if ((s = session_by_x11_channel(id)) == NULL) | |
2136 | fatal("session_close_single_x11: no x11 channel %d", id); | |
2137 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2138 | debug("session_close_single_x11: session %d: " | |
2139 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2140 | /* | |
2141 | * The channel "id" is already closing, but make sure we | |
2142 | * close all of its siblings. | |
2143 | */ | |
2144 | if (s->x11_chanids[i] != id) | |
2145 | session_close_x11(s->x11_chanids[i]); | |
2146 | } | |
2147 | xfree(s->x11_chanids); | |
2148 | s->x11_chanids = NULL; | |
2149 | if (s->display) { | |
2150 | xfree(s->display); | |
2151 | s->display = NULL; | |
2152 | } | |
2153 | if (s->auth_proto) { | |
2154 | xfree(s->auth_proto); | |
2155 | s->auth_proto = NULL; | |
2156 | } | |
2157 | if (s->auth_data) { | |
2158 | xfree(s->auth_data); | |
2159 | s->auth_data = NULL; | |
2160 | } | |
2161 | if (s->auth_display) { | |
2162 | xfree(s->auth_display); | |
2163 | s->auth_display = NULL; | |
2164 | } | |
2165 | } | |
2166 | ||
396c147e | 2167 | static void |
e78a59f5 | 2168 | session_exit_message(Session *s, int status) |
2169 | { | |
2170 | Channel *c; | |
5a4ae906 | 2171 | |
2172 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 2173 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 2174 | s->self, s->chanid); |
c457707e | 2175 | debug("session_exit_message: session %d channel %d pid %ld", |
2176 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 2177 | |
2178 | if (WIFEXITED(status)) { | |
5a4ae906 | 2179 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 2180 | packet_put_int(WEXITSTATUS(status)); |
2181 | packet_send(); | |
2182 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 2183 | channel_request_start(s->chanid, "exit-signal", 0); |
6c723e7c | 2184 | packet_put_cstring(sig2name(WTERMSIG(status))); |
a64009ad | 2185 | #ifdef WCOREDUMP |
e78a59f5 | 2186 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 2187 | #else /* WCOREDUMP */ |
2188 | packet_put_char(0); | |
2189 | #endif /* WCOREDUMP */ | |
e78a59f5 | 2190 | packet_put_cstring(""); |
2191 | packet_put_cstring(""); | |
2192 | packet_send(); | |
2193 | } else { | |
2194 | /* Some weird exit cause. Just exit. */ | |
2195 | packet_disconnect("wait returned status %04x.", status); | |
2196 | } | |
2197 | ||
2198 | /* disconnect channel */ | |
2199 | debug("session_exit_message: release channel %d", s->chanid); | |
8cd0437d | 2200 | |
2201 | /* | |
2202 | * Adjust cleanup callback attachment to send close messages when | |
b4bbf172 | 2203 | * the channel gets EOF. The session will be then be closed |
8cd0437d | 2204 | * by session_close_by_channel when the childs close their fds. |
2205 | */ | |
2206 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2207 | ||
9da5c3c9 | 2208 | /* |
2209 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2210 | * interested in data we write. | |
2211 | * Note that we must not call 'chan_read_failed', since there could | |
2212 | * be some more data waiting in the pipe. | |
2213 | */ | |
0b242b12 | 2214 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
2215 | chan_write_failed(c); | |
e78a59f5 | 2216 | } |
2217 | ||
1853d1ef | 2218 | void |
86066315 | 2219 | session_close(Session *s) |
e78a59f5 | 2220 | { |
2ceb8101 | 2221 | u_int i; |
61a2c1da | 2222 | |
c457707e | 2223 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
2362db19 | 2224 | if (s->ttyfd != -1) |
86066315 | 2225 | session_pty_cleanup(s); |
e78a59f5 | 2226 | if (s->term) |
2227 | xfree(s->term); | |
2228 | if (s->display) | |
2229 | xfree(s->display); | |
d08341e6 | 2230 | if (s->x11_chanids) |
2231 | xfree(s->x11_chanids); | |
f9314d9a | 2232 | if (s->auth_display) |
2233 | xfree(s->auth_display); | |
e78a59f5 | 2234 | if (s->auth_data) |
2235 | xfree(s->auth_data); | |
2236 | if (s->auth_proto) | |
2237 | xfree(s->auth_proto); | |
2238 | s->used = 0; | |
61a2c1da | 2239 | for (i = 0; i < s->num_env; i++) { |
2240 | xfree(s->env[i].name); | |
2241 | xfree(s->env[i].val); | |
2242 | } | |
2243 | if (s->env != NULL) | |
2244 | xfree(s->env); | |
1d1ffb87 | 2245 | session_proctitle(s); |
e78a59f5 | 2246 | } |
2247 | ||
2248 | void | |
2249 | session_close_by_pid(pid_t pid, int status) | |
2250 | { | |
2251 | Session *s = session_by_pid(pid); | |
2252 | if (s == NULL) { | |
c457707e | 2253 | debug("session_close_by_pid: no session for pid %ld", |
2254 | (long)pid); | |
e78a59f5 | 2255 | return; |
2256 | } | |
2257 | if (s->chanid != -1) | |
2258 | session_exit_message(s, status); | |
8cd0437d | 2259 | if (s->ttyfd != -1) |
2260 | session_pty_cleanup(s); | |
4c721c3d | 2261 | s->pid = 0; |
e78a59f5 | 2262 | } |
2263 | ||
2264 | /* | |
2265 | * this is called when a channel dies before | |
2266 | * the session 'child' itself dies | |
2267 | */ | |
2268 | void | |
2269 | session_close_by_channel(int id, void *arg) | |
2270 | { | |
2271 | Session *s = session_by_channel(id); | |
8cd0437d | 2272 | u_int i; |
d08341e6 | 2273 | |
e78a59f5 | 2274 | if (s == NULL) { |
418e724c | 2275 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 2276 | return; |
2277 | } | |
c457707e | 2278 | debug("session_close_by_channel: channel %d child %ld", |
2279 | id, (long)s->pid); | |
d5f24f94 | 2280 | if (s->pid != 0) { |
418e724c | 2281 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 2282 | /* |
2283 | * delay detach of session, but release pty, since | |
2284 | * the fd's to the child are already closed | |
2285 | */ | |
2362db19 | 2286 | if (s->ttyfd != -1) |
efcc9957 | 2287 | session_pty_cleanup(s); |
418e724c | 2288 | return; |
e78a59f5 | 2289 | } |
418e724c | 2290 | /* detach by removing callback */ |
2291 | channel_cancel_cleanup(s->chanid); | |
8cd0437d | 2292 | |
2293 | /* Close any X11 listeners associated with this session */ | |
2294 | if (s->x11_chanids != NULL) { | |
2295 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2296 | session_close_x11(s->x11_chanids[i]); | |
2297 | s->x11_chanids[i] = -1; | |
2298 | } | |
2299 | } | |
2300 | ||
418e724c | 2301 | s->chanid = -1; |
d5f24f94 | 2302 | session_close(s); |
2303 | } | |
2304 | ||
2305 | void | |
1853d1ef | 2306 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 2307 | { |
2308 | int i; | |
184eed6a | 2309 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 2310 | Session *s = &sessions[i]; |
1853d1ef | 2311 | if (s->used) { |
2312 | if (closefunc != NULL) | |
2313 | closefunc(s); | |
2314 | else | |
2315 | session_close(s); | |
2316 | } | |
d5f24f94 | 2317 | } |
e78a59f5 | 2318 | } |
2319 | ||
396c147e | 2320 | static char * |
1d1ffb87 | 2321 | session_tty_list(void) |
2322 | { | |
2323 | static char buf[1024]; | |
2324 | int i; | |
d0104542 | 2325 | char *cp; |
2326 | ||
1d1ffb87 | 2327 | buf[0] = '\0'; |
184eed6a | 2328 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 2329 | Session *s = &sessions[i]; |
2330 | if (s->used && s->ttyfd != -1) { | |
b6453d99 | 2331 | |
d0104542 | 2332 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2333 | cp = strrchr(s->tty, '/'); | |
2334 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2335 | } else | |
2336 | cp = s->tty + 5; | |
b6453d99 | 2337 | |
1d1ffb87 | 2338 | if (buf[0] != '\0') |
2339 | strlcat(buf, ",", sizeof buf); | |
d0104542 | 2340 | strlcat(buf, cp, sizeof buf); |
1d1ffb87 | 2341 | } |
2342 | } | |
2343 | if (buf[0] == '\0') | |
2344 | strlcpy(buf, "notty", sizeof buf); | |
2345 | return buf; | |
2346 | } | |
2347 | ||
2348 | void | |
2349 | session_proctitle(Session *s) | |
2350 | { | |
2351 | if (s->pw == NULL) | |
2352 | error("no user for session %d", s->self); | |
2353 | else | |
2354 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2355 | } | |
2356 | ||
8dcd9d5c | 2357 | int |
2358 | session_setup_x11fwd(Session *s) | |
2359 | { | |
8dcd9d5c | 2360 | struct stat st; |
c9d0ad9b | 2361 | char display[512], auth_display[512]; |
2362 | char hostname[MAXHOSTNAMELEN]; | |
d08341e6 | 2363 | u_int i; |
8dcd9d5c | 2364 | |
2365 | if (no_x11_forwarding_flag) { | |
2366 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2367 | return 0; | |
2368 | } | |
2369 | if (!options.x11_forwarding) { | |
2370 | debug("X11 forwarding disabled in server configuration file."); | |
2371 | return 0; | |
2372 | } | |
2373 | if (!options.xauth_location || | |
2374 | (stat(options.xauth_location, &st) == -1)) { | |
2375 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2376 | return 0; | |
2377 | } | |
ff027d84 | 2378 | if (options.use_login) { |
2379 | packet_send_debug("X11 forwarding disabled; " | |
2380 | "not compatible with UseLogin=yes."); | |
2381 | return 0; | |
2382 | } | |
b44de2b1 | 2383 | if (s->display != NULL) { |
8dcd9d5c | 2384 | debug("X11 display already set."); |
2385 | return 0; | |
2386 | } | |
57f228e8 | 2387 | if (x11_create_display_inet(options.x11_display_offset, |
2388 | options.x11_use_localhost, s->single_connection, | |
d08341e6 | 2389 | &s->display_number, &s->x11_chanids) == -1) { |
b44de2b1 | 2390 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 2391 | return 0; |
2392 | } | |
d08341e6 | 2393 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2394 | channel_register_cleanup(s->x11_chanids[i], | |
8cd0437d | 2395 | session_close_single_x11, 0); |
d08341e6 | 2396 | } |
c9d0ad9b | 2397 | |
2398 | /* Set up a suitable value for the DISPLAY variable. */ | |
2399 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2400 | fatal("gethostname: %.100s", strerror(errno)); | |
2401 | /* | |
2402 | * auth_display must be used as the displayname when the | |
2403 | * authorization entry is added with xauth(1). This will be | |
2404 | * different than the DISPLAY string for localhost displays. | |
2405 | */ | |
e6e573bd | 2406 | if (options.x11_use_localhost) { |
57f228e8 | 2407 | snprintf(display, sizeof display, "localhost:%u.%u", |
c9d0ad9b | 2408 | s->display_number, s->screen); |
57f228e8 | 2409 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
f9314d9a | 2410 | s->display_number, s->screen); |
c9d0ad9b | 2411 | s->display = xstrdup(display); |
f9314d9a | 2412 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 2413 | } else { |
2414 | #ifdef IPADDR_IN_DISPLAY | |
2415 | struct hostent *he; | |
2416 | struct in_addr my_addr; | |
2417 | ||
2418 | he = gethostbyname(hostname); | |
2419 | if (he == NULL) { | |
2420 | error("Can't get IP address for X11 DISPLAY."); | |
2421 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2422 | return 0; | |
2423 | } | |
2424 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
57f228e8 | 2425 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
c9d0ad9b | 2426 | s->display_number, s->screen); |
2427 | #else | |
57f228e8 | 2428 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
c9d0ad9b | 2429 | s->display_number, s->screen); |
2430 | #endif | |
2431 | s->display = xstrdup(display); | |
f9314d9a | 2432 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2433 | } |
2434 | ||
8dcd9d5c | 2435 | return 1; |
2436 | } | |
2437 | ||
396c147e | 2438 | static void |
59c97189 | 2439 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2440 | { |
57156994 | 2441 | server_loop2(authctxt); |
2362db19 | 2442 | } |
2443 | ||
2444 | void | |
2445 | do_cleanup(Authctxt *authctxt) | |
2446 | { | |
2447 | static int called = 0; | |
2448 | ||
2449 | debug("do_cleanup"); | |
2450 | ||
2451 | /* no cleanup if we're in the child for login shell */ | |
2452 | if (is_child) | |
2453 | return; | |
2454 | ||
2455 | /* avoid double cleanup */ | |
2456 | if (called) | |
2457 | return; | |
2458 | called = 1; | |
2459 | ||
2460 | if (authctxt == NULL) | |
2461 | return; | |
2462 | #ifdef KRB5 | |
2463 | if (options.kerberos_ticket_cleanup && | |
2464 | authctxt->krb5_ctx) | |
2465 | krb5_cleanup_proc(authctxt); | |
7364bd04 | 2466 | #endif |
2362db19 | 2467 | |
2468 | #ifdef GSSAPI | |
2469 | if (compat20 && options.gss_cleanup_creds) | |
2470 | ssh_gssapi_cleanup_creds(); | |
2471 | #endif | |
2472 | ||
c6630044 | 2473 | #ifdef USE_PAM |
2474 | if (options.use_pam) { | |
2475 | sshpam_cleanup(); | |
2476 | sshpam_thread_cleanup(); | |
2477 | } | |
2478 | #endif | |
2479 | ||
2362db19 | 2480 | /* remove agent socket */ |
2481 | auth_sock_cleanup_proc(authctxt->pw); | |
2482 | ||
2483 | /* | |
2484 | * Cleanup ptys/utmp only if privsep is disabled, | |
2485 | * or if running in monitor. | |
2486 | */ | |
2487 | if (!use_privsep || mm_is_monitor()) | |
2488 | session_destroy_all(session_pty_cleanup2); | |
e78a59f5 | 2489 | } |