]>
Commit | Line | Data |
---|---|---|
028094f4 | 1 | /* $OpenBSD: session.c,v 1.209 2006/07/11 20:07:25 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 | |
028094f4 | 46 | #include <errno.h> |
16fbe330 | 47 | #include <grp.h> |
b5b88c19 | 48 | #ifdef HAVE_PATHS_H |
a75f5360 | 49 | #include <paths.h> |
b5b88c19 | 50 | #endif |
b1842393 | 51 | #include <pwd.h> |
ada68823 | 52 | #include <signal.h> |
319d6b41 | 53 | #include <arpa/inet.h> |
7368a6c8 | 54 | |
7368a6c8 | 55 | #include "ssh.h" |
42f11eb2 | 56 | #include "ssh1.h" |
57 | #include "ssh2.h" | |
58 | #include "xmalloc.h" | |
1729c161 | 59 | #include "sshpty.h" |
7368a6c8 | 60 | #include "packet.h" |
61 | #include "buffer.h" | |
61a2c1da | 62 | #include "match.h" |
7368a6c8 | 63 | #include "uidswap.h" |
64 | #include "compat.h" | |
a5efa1bb | 65 | #include "channels.h" |
e78a59f5 | 66 | #include "bufaux.h" |
e78a59f5 | 67 | #include "auth.h" |
38c295d6 | 68 | #include "auth-options.h" |
42f11eb2 | 69 | #include "pathnames.h" |
70 | #include "log.h" | |
71 | #include "servconf.h" | |
1729c161 | 72 | #include "sshlogin.h" |
42f11eb2 | 73 | #include "serverloop.h" |
74 | #include "canohost.h" | |
5ca51e19 | 75 | #include "session.h" |
07200973 | 76 | #include "kex.h" |
1853d1ef | 77 | #include "monitor_wrap.h" |
e78a59f5 | 78 | |
bcfcc5f9 | 79 | #if defined(KRB5) && defined(USE_AFS) |
39dfceeb | 80 | #include <kafs.h> |
81 | #endif | |
82 | ||
7364bd04 | 83 | #ifdef GSSAPI |
84 | #include "ssh-gss.h" | |
85 | #endif | |
86 | ||
7368a6c8 | 87 | /* func */ |
88 | ||
89 | Session *session_new(void); | |
9c328529 | 90 | void session_set_fds(Session *, int, int, int); |
2362db19 | 91 | void session_pty_cleanup(Session *); |
9c328529 | 92 | void session_proctitle(Session *); |
93 | int session_setup_x11fwd(Session *); | |
94 | void do_exec_pty(Session *, const char *); | |
95 | void do_exec_no_pty(Session *, const char *); | |
96 | void do_exec(Session *, const char *); | |
97 | void do_login(Session *, const char *); | |
8a9ac95d | 98 | #ifdef LOGIN_NEEDS_UTMPX |
99 | static void do_pre_login(Session *s); | |
100 | #endif | |
9c328529 | 101 | void do_child(Session *, const char *); |
f2c2fd71 | 102 | void do_motd(void); |
9c328529 | 103 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 104 | |
396c147e | 105 | static void do_authenticated1(Authctxt *); |
106 | static void do_authenticated2(Authctxt *); | |
9c328529 | 107 | |
396c147e | 108 | static int session_pty_req(Session *); |
bb5639fe | 109 | |
7368a6c8 | 110 | /* import */ |
111 | extern ServerOptions options; | |
112 | extern char *__progname; | |
113 | extern int log_stderr; | |
114 | extern int debug_flag; | |
1e3b8b07 | 115 | extern u_int utmp_len; |
089fbbd2 | 116 | extern int startup_pipe; |
e78e738a | 117 | extern void destroy_sensitive_data(void); |
bc7dfc06 | 118 | extern Buffer loginmsg; |
089fbbd2 | 119 | |
b5e300c2 | 120 | /* original command from peer. */ |
c95add71 | 121 | const char *original_command = NULL; |
b5e300c2 | 122 | |
7368a6c8 | 123 | /* data */ |
124 | #define MAX_SESSIONS 10 | |
125 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 126 | |
2e73a022 | 127 | #ifdef HAVE_LOGIN_CAP |
1836f69f | 128 | login_cap_t *lc; |
2e73a022 | 129 | #endif |
130 | ||
2362db19 | 131 | static int is_child = 0; |
132 | ||
149cdb60 | 133 | /* Name and directory of socket for authentication agent forwarding. */ |
134 | static char *auth_sock_name = NULL; | |
135 | static char *auth_sock_dir = NULL; | |
136 | ||
137 | /* removes the agent forwarding socket */ | |
138 | ||
139 | static void | |
2362db19 | 140 | auth_sock_cleanup_proc(struct passwd *pw) |
149cdb60 | 141 | { |
149cdb60 | 142 | if (auth_sock_name != NULL) { |
143 | temporarily_use_uid(pw); | |
144 | unlink(auth_sock_name); | |
145 | rmdir(auth_sock_dir); | |
146 | auth_sock_name = NULL; | |
147 | restore_uid(); | |
148 | } | |
149 | } | |
150 | ||
151 | static int | |
152 | auth_input_request_forwarding(struct passwd * pw) | |
153 | { | |
154 | Channel *nc; | |
155 | int sock; | |
156 | struct sockaddr_un sunaddr; | |
157 | ||
158 | if (auth_sock_name != NULL) { | |
159 | error("authentication forwarding requested twice."); | |
160 | return 0; | |
161 | } | |
162 | ||
163 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
164 | temporarily_use_uid(pw); | |
165 | ||
166 | /* Allocate a buffer for the socket name, and format the name. */ | |
167 | auth_sock_name = xmalloc(MAXPATHLEN); | |
168 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
c88de854 | 169 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
149cdb60 | 170 | |
171 | /* Create private directory for socket */ | |
172 | if (mkdtemp(auth_sock_dir) == NULL) { | |
173 | packet_send_debug("Agent forwarding disabled: " | |
174 | "mkdtemp() failed: %.100s", strerror(errno)); | |
175 | restore_uid(); | |
176 | xfree(auth_sock_name); | |
177 | xfree(auth_sock_dir); | |
178 | auth_sock_name = NULL; | |
179 | auth_sock_dir = NULL; | |
180 | return 0; | |
181 | } | |
c457707e | 182 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
183 | auth_sock_dir, (long) getpid()); | |
149cdb60 | 184 | |
149cdb60 | 185 | /* Create the socket. */ |
186 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
187 | if (sock < 0) | |
188 | packet_disconnect("socket: %.100s", strerror(errno)); | |
189 | ||
190 | /* Bind it to the name. */ | |
191 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
192 | sunaddr.sun_family = AF_UNIX; | |
193 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
194 | ||
32596c7b | 195 | if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) |
149cdb60 | 196 | packet_disconnect("bind: %.100s", strerror(errno)); |
197 | ||
198 | /* Restore the privileged uid. */ | |
199 | restore_uid(); | |
200 | ||
201 | /* Start listening on the socket. */ | |
fce39749 | 202 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
149cdb60 | 203 | packet_disconnect("listen: %.100s", strerror(errno)); |
204 | ||
205 | /* Allocate a channel for the authentication agent socket. */ | |
206 | nc = channel_new("auth socket", | |
207 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
208 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
0d942eff | 209 | 0, "auth socket", 1); |
149cdb60 | 210 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
211 | return 1; | |
212 | } | |
213 | ||
dd1fb864 | 214 | static void |
215 | display_loginmsg(void) | |
216 | { | |
56964485 | 217 | if (buffer_len(&loginmsg) > 0) { |
218 | buffer_append(&loginmsg, "\0", 1); | |
219 | printf("%s", (char *)buffer_ptr(&loginmsg)); | |
220 | buffer_clear(&loginmsg); | |
221 | } | |
dd1fb864 | 222 | } |
149cdb60 | 223 | |
bb5639fe | 224 | void |
225 | do_authenticated(Authctxt *authctxt) | |
226 | { | |
381b021b | 227 | setproctitle("%s", authctxt->pw->pw_name); |
228 | ||
bb5639fe | 229 | /* setup the channel layer */ |
230 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
231 | channel_permit_all_opens(); | |
232 | ||
233 | if (compat20) | |
234 | do_authenticated2(authctxt); | |
235 | else | |
236 | do_authenticated1(authctxt); | |
e4f7282d | 237 | |
2362db19 | 238 | do_cleanup(authctxt); |
bb5639fe | 239 | } |
240 | ||
7368a6c8 | 241 | /* |
242 | * Prepares for an interactive session. This is called after the user has | |
243 | * been successfully authenticated. During this message exchange, pseudo | |
244 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
245 | * are requested, etc. | |
246 | */ | |
396c147e | 247 | static void |
bb5639fe | 248 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 249 | { |
250 | Session *s; | |
7368a6c8 | 251 | char *command; |
54a5250f | 252 | int success, type, screen_flag; |
7138ebd9 | 253 | int enable_compression_after_reply = 0; |
254 | u_int proto_len, data_len, dlen, compression_level = 0; | |
7368a6c8 | 255 | |
256 | s = session_new(); | |
b0042027 | 257 | if (s == NULL) { |
258 | error("no more sessions"); | |
259 | return; | |
260 | } | |
ced49be2 | 261 | s->authctxt = authctxt; |
bb5639fe | 262 | s->pw = authctxt->pw; |
2e73a022 | 263 | |
7368a6c8 | 264 | /* |
265 | * We stay in this loop until the client requests to execute a shell | |
266 | * or a command. | |
267 | */ | |
268 | for (;;) { | |
bb5639fe | 269 | success = 0; |
7368a6c8 | 270 | |
271 | /* Get a packet from the client. */ | |
54a5250f | 272 | type = packet_read(); |
7368a6c8 | 273 | |
274 | /* Process the packet. */ | |
275 | switch (type) { | |
276 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 277 | compression_level = packet_get_int(); |
95500969 | 278 | packet_check_eom(); |
7368a6c8 | 279 | if (compression_level < 1 || compression_level > 9) { |
d77347cc | 280 | packet_send_debug("Received invalid compression level %d.", |
184eed6a | 281 | compression_level); |
7368a6c8 | 282 | break; |
283 | } | |
07200973 | 284 | if (options.compression == COMP_NONE) { |
636f76ca | 285 | debug2("compression disabled"); |
286 | break; | |
287 | } | |
7368a6c8 | 288 | /* Enable compression after we have responded with SUCCESS. */ |
289 | enable_compression_after_reply = 1; | |
290 | success = 1; | |
291 | break; | |
292 | ||
293 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 294 | success = session_pty_req(s); |
7368a6c8 | 295 | break; |
296 | ||
297 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 298 | s->auth_proto = packet_get_string(&proto_len); |
299 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 300 | |
2af09193 | 301 | screen_flag = packet_get_protocol_flags() & |
302 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
303 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
304 | ||
305 | if (packet_remaining() == 4) { | |
306 | if (!screen_flag) | |
307 | debug2("Buggy client: " | |
308 | "X11 screen flag missing"); | |
7368a6c8 | 309 | s->screen = packet_get_int(); |
c8b058b4 | 310 | } else { |
7368a6c8 | 311 | s->screen = 0; |
c8b058b4 | 312 | } |
95500969 | 313 | packet_check_eom(); |
8dcd9d5c | 314 | success = session_setup_x11fwd(s); |
315 | if (!success) { | |
316 | xfree(s->auth_proto); | |
317 | xfree(s->auth_data); | |
1500bcdd | 318 | s->auth_proto = NULL; |
319 | s->auth_data = NULL; | |
7368a6c8 | 320 | } |
7368a6c8 | 321 | break; |
7368a6c8 | 322 | |
323 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
324 | if (no_agent_forwarding_flag || compat13) { | |
325 | debug("Authentication agent forwarding not permitted for this authentication."); | |
326 | break; | |
327 | } | |
328 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 329 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 330 | break; |
331 | ||
332 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
333 | if (no_port_forwarding_flag) { | |
334 | debug("Port forwarding not permitted for this authentication."); | |
335 | break; | |
336 | } | |
33de75a3 | 337 | if (!options.allow_tcp_forwarding) { |
338 | debug("Port forwarding not permitted."); | |
339 | break; | |
340 | } | |
7368a6c8 | 341 | debug("Received TCP/IP port forwarding request."); |
42ea6f5e | 342 | if (channel_input_port_forward_request(s->pw->pw_uid == 0, |
343 | options.gateway_ports) < 0) { | |
344 | debug("Port forwarding failed."); | |
345 | break; | |
346 | } | |
7368a6c8 | 347 | success = 1; |
348 | break; | |
349 | ||
350 | case SSH_CMSG_MAX_PACKET_SIZE: | |
351 | if (packet_set_maxsize(packet_get_int()) > 0) | |
352 | success = 1; | |
353 | break; | |
184eed6a | 354 | |
7368a6c8 | 355 | case SSH_CMSG_EXEC_SHELL: |
356 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 357 | if (type == SSH_CMSG_EXEC_CMD) { |
358 | command = packet_get_string(&dlen); | |
359 | debug("Exec command '%.500s'", command); | |
c95add71 | 360 | do_exec(s, command); |
361 | xfree(command); | |
7368a6c8 | 362 | } else { |
c95add71 | 363 | do_exec(s, NULL); |
7368a6c8 | 364 | } |
95500969 | 365 | packet_check_eom(); |
fc2a1d28 | 366 | session_close(s); |
7368a6c8 | 367 | return; |
368 | ||
369 | default: | |
370 | /* | |
371 | * Any unknown messages in this phase are ignored, | |
372 | * and a failure message is returned. | |
373 | */ | |
bbe88b6d | 374 | logit("Unknown packet type received after authentication: %d", type); |
7368a6c8 | 375 | } |
376 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
377 | packet_send(); | |
378 | packet_write_wait(); | |
379 | ||
380 | /* Enable compression now that we have replied if appropriate. */ | |
381 | if (enable_compression_after_reply) { | |
382 | enable_compression_after_reply = 0; | |
383 | packet_start_compression(compression_level); | |
384 | } | |
385 | } | |
386 | } | |
387 | ||
388 | /* | |
389 | * This is called to fork and execute a command when we have no tty. This | |
390 | * will call do_child from the child, and server_loop from the parent after | |
391 | * setting up file descriptors and such. | |
392 | */ | |
6ae2364d | 393 | void |
65068d16 | 394 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 395 | { |
c457707e | 396 | pid_t pid; |
7368a6c8 | 397 | |
398 | #ifdef USE_PIPES | |
399 | int pin[2], pout[2], perr[2]; | |
400 | /* Allocate pipes for communicating with the program. */ | |
401 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
402 | packet_disconnect("Could not create pipes: %.100s", | |
403 | strerror(errno)); | |
404 | #else /* USE_PIPES */ | |
405 | int inout[2], err[2]; | |
406 | /* Uses socket pairs to communicate with the program. */ | |
407 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
408 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
409 | packet_disconnect("Could not create socket pairs: %.100s", | |
410 | strerror(errno)); | |
411 | #endif /* USE_PIPES */ | |
412 | if (s == NULL) | |
413 | fatal("do_exec_no_pty: no session"); | |
414 | ||
1d1ffb87 | 415 | session_proctitle(s); |
7368a6c8 | 416 | |
b19d61d7 | 417 | #if defined(USE_PAM) |
59f327e0 | 418 | if (options.use_pam && !use_privsep) |
7fceb20d | 419 | do_pam_setcred(1); |
266140a8 | 420 | #endif /* USE_PAM */ |
421 | ||
7368a6c8 | 422 | /* Fork the child. */ |
423 | if ((pid = fork()) == 0) { | |
2362db19 | 424 | is_child = 1; |
516f0d7d | 425 | |
7368a6c8 | 426 | /* Child. Reinitialize the log since the pid has changed. */ |
427 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
428 | ||
429 | /* | |
430 | * Create a new session and process group since the 4.4BSD | |
431 | * setlogin() affects the entire process group. | |
432 | */ | |
433 | if (setsid() < 0) | |
434 | error("setsid failed: %.100s", strerror(errno)); | |
435 | ||
436 | #ifdef USE_PIPES | |
437 | /* | |
438 | * Redirect stdin. We close the parent side of the socket | |
439 | * pair, and make the child side the standard input. | |
440 | */ | |
441 | close(pin[1]); | |
442 | if (dup2(pin[0], 0) < 0) | |
443 | perror("dup2 stdin"); | |
444 | close(pin[0]); | |
445 | ||
446 | /* Redirect stdout. */ | |
447 | close(pout[0]); | |
448 | if (dup2(pout[1], 1) < 0) | |
449 | perror("dup2 stdout"); | |
450 | close(pout[1]); | |
451 | ||
452 | /* Redirect stderr. */ | |
453 | close(perr[0]); | |
454 | if (dup2(perr[1], 2) < 0) | |
455 | perror("dup2 stderr"); | |
456 | close(perr[1]); | |
457 | #else /* USE_PIPES */ | |
458 | /* | |
459 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
460 | * use the same socket, as some programs (particularly rdist) | |
461 | * seem to depend on it. | |
462 | */ | |
463 | close(inout[1]); | |
464 | close(err[1]); | |
465 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
466 | perror("dup2 stdin"); | |
467 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
468 | perror("dup2 stdout"); | |
469 | if (dup2(err[0], 2) < 0) /* stderr */ | |
470 | perror("dup2 stderr"); | |
471 | #endif /* USE_PIPES */ | |
472 | ||
ef51930f | 473 | #ifdef _UNICOS |
474 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
475 | #endif | |
476 | ||
7368a6c8 | 477 | /* Do processing for the child (exec command etc). */ |
56b3e9ce | 478 | do_child(s, command); |
7368a6c8 | 479 | /* NOTREACHED */ |
480 | } | |
ef51930f | 481 | #ifdef _UNICOS |
482 | signal(WJSIGNAL, cray_job_termination_handler); | |
483 | #endif /* _UNICOS */ | |
3c62e7eb | 484 | #ifdef HAVE_CYGWIN |
485 | if (is_winnt) | |
486 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
487 | #endif | |
7368a6c8 | 488 | if (pid < 0) |
489 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
490 | s->pid = pid; | |
b5c334cc | 491 | /* Set interactive/non-interactive mode. */ |
492 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 493 | #ifdef USE_PIPES |
494 | /* We are the parent. Close the child sides of the pipes. */ | |
495 | close(pin[0]); | |
496 | close(pout[1]); | |
497 | close(perr[1]); | |
498 | ||
e78a59f5 | 499 | if (compat20) { |
d7ecbe88 | 500 | if (s->is_subsystem) { |
501 | close(perr[0]); | |
502 | perr[0] = -1; | |
503 | } | |
504 | session_set_fds(s, pin[1], pout[0], perr[0]); | |
e78a59f5 | 505 | } else { |
506 | /* Enter the interactive session. */ | |
507 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 508 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 509 | } |
7368a6c8 | 510 | #else /* USE_PIPES */ |
511 | /* We are the parent. Close the child sides of the socket pairs. */ | |
512 | close(inout[0]); | |
513 | close(err[0]); | |
514 | ||
75dbfa01 | 515 | /* |
516 | * Clear loginmsg, since it's the child's responsibility to display | |
517 | * it to the user, otherwise multiple sessions may accumulate | |
518 | * multiple copies of the login messages. | |
519 | */ | |
520 | buffer_clear(&loginmsg); | |
521 | ||
7368a6c8 | 522 | /* |
523 | * Enter the interactive session. Note: server_loop must be able to | |
524 | * handle the case that fdin and fdout are the same. | |
525 | */ | |
e78a59f5 | 526 | if (compat20) { |
e5d7a405 | 527 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 528 | } else { |
529 | server_loop(pid, inout[1], inout[1], err[1]); | |
530 | /* server_loop has closed inout[1] and err[1]. */ | |
531 | } | |
7368a6c8 | 532 | #endif /* USE_PIPES */ |
533 | } | |
534 | ||
535 | /* | |
536 | * This is called to fork and execute a command when we have a tty. This | |
537 | * will call do_child from the child, and server_loop from the parent after | |
538 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
539 | * lastlog, and other such operations. | |
540 | */ | |
6ae2364d | 541 | void |
65068d16 | 542 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 543 | { |
7368a6c8 | 544 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 545 | pid_t pid; |
7368a6c8 | 546 | |
547 | if (s == NULL) | |
548 | fatal("do_exec_pty: no session"); | |
549 | ptyfd = s->ptyfd; | |
550 | ttyfd = s->ttyfd; | |
551 | ||
b19d61d7 | 552 | #if defined(USE_PAM) |
7fceb20d | 553 | if (options.use_pam) { |
49e82bb9 | 554 | do_pam_set_tty(s->tty); |
72037bc8 | 555 | if (!use_privsep) |
556 | do_pam_setcred(1); | |
7fceb20d | 557 | } |
27cf96de | 558 | #endif |
266140a8 | 559 | |
7368a6c8 | 560 | /* Fork the child. */ |
561 | if ((pid = fork()) == 0) { | |
2362db19 | 562 | is_child = 1; |
57156994 | 563 | |
c345cf9d | 564 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 565 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 566 | /* Close the master side of the pseudo tty. */ |
567 | close(ptyfd); | |
568 | ||
569 | /* Make the pseudo tty our controlling tty. */ | |
570 | pty_make_controlling_tty(&ttyfd, s->tty); | |
571 | ||
05fd093c | 572 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
573 | if (dup2(ttyfd, 0) < 0) | |
574 | error("dup2 stdin: %s", strerror(errno)); | |
575 | if (dup2(ttyfd, 1) < 0) | |
576 | error("dup2 stdout: %s", strerror(errno)); | |
577 | if (dup2(ttyfd, 2) < 0) | |
578 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 579 | |
580 | /* Close the extra descriptor for the pseudo tty. */ | |
581 | close(ttyfd); | |
582 | ||
c345cf9d | 583 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 584 | #ifndef HAVE_OSF_SIA |
ef51930f | 585 | if (!(options.use_login && command == NULL)) { |
586 | #ifdef _UNICOS | |
587 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ | |
588 | #endif /* _UNICOS */ | |
a22aff1f | 589 | do_login(s, command); |
ef51930f | 590 | } |
7e2d5fa4 | 591 | # ifdef LOGIN_NEEDS_UTMPX |
592 | else | |
593 | do_pre_login(s); | |
594 | # endif | |
c96a4aaf | 595 | #endif |
7368a6c8 | 596 | |
7368a6c8 | 597 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 598 | do_child(s, command); |
7368a6c8 | 599 | /* NOTREACHED */ |
600 | } | |
ef51930f | 601 | #ifdef _UNICOS |
602 | signal(WJSIGNAL, cray_job_termination_handler); | |
603 | #endif /* _UNICOS */ | |
3c62e7eb | 604 | #ifdef HAVE_CYGWIN |
605 | if (is_winnt) | |
606 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
607 | #endif | |
7368a6c8 | 608 | if (pid < 0) |
609 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
610 | s->pid = pid; | |
611 | ||
612 | /* Parent. Close the slave side of the pseudo tty. */ | |
613 | close(ttyfd); | |
614 | ||
615 | /* | |
616 | * Create another descriptor of the pty master side for use as the | |
617 | * standard input. We could use the original descriptor, but this | |
618 | * simplifies code in server_loop. The descriptor is bidirectional. | |
619 | */ | |
620 | fdout = dup(ptyfd); | |
621 | if (fdout < 0) | |
622 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
623 | ||
624 | /* we keep a reference to the pty master */ | |
625 | ptymaster = dup(ptyfd); | |
626 | if (ptymaster < 0) | |
627 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
628 | s->ptymaster = ptymaster; | |
629 | ||
630 | /* Enter interactive session. */ | |
b5c334cc | 631 | packet_set_interactive(1); |
e78a59f5 | 632 | if (compat20) { |
633 | session_set_fds(s, ptyfd, fdout, -1); | |
634 | } else { | |
635 | server_loop(pid, ptyfd, fdout, -1); | |
636 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 637 | } |
7368a6c8 | 638 | } |
639 | ||
7e2d5fa4 | 640 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 641 | static void |
7e2d5fa4 | 642 | do_pre_login(Session *s) |
643 | { | |
644 | socklen_t fromlen; | |
645 | struct sockaddr_storage from; | |
646 | pid_t pid = getpid(); | |
647 | ||
648 | /* | |
649 | * Get IP address of client. If the connection is not a socket, let | |
650 | * the address be 0.0.0.0. | |
651 | */ | |
652 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 653 | fromlen = sizeof(from); |
7e2d5fa4 | 654 | if (packet_connection_is_on_socket()) { |
7e2d5fa4 | 655 | if (getpeername(packet_get_connection_in(), |
32596c7b | 656 | (struct sockaddr *)&from, &fromlen) < 0) { |
7e2d5fa4 | 657 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 658 | cleanup_exit(255); |
7e2d5fa4 | 659 | } |
660 | } | |
661 | ||
662 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
c5a7d788 | 663 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d4ac26ed | 664 | (struct sockaddr *)&from, fromlen); |
7e2d5fa4 | 665 | } |
666 | #endif | |
667 | ||
dac6753b | 668 | /* |
669 | * This is called to fork and execute a command. If another command is | |
670 | * to be forced, execute that instead. | |
671 | */ | |
672 | void | |
673 | do_exec(Session *s, const char *command) | |
674 | { | |
675 | if (forced_command) { | |
676 | original_command = command; | |
677 | command = forced_command; | |
dac6753b | 678 | debug("Forced command '%.900s'", command); |
679 | } | |
680 | ||
6039eeef | 681 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 682 | if (command != NULL) |
683 | PRIVSEP(audit_run_command(command)); | |
684 | else if (s->ttyfd == -1) { | |
685 | char *shell = s->pw->pw_shell; | |
686 | ||
687 | if (shell[0] == '\0') /* empty shell means /bin/sh */ | |
688 | shell =_PATH_BSHELL; | |
689 | PRIVSEP(audit_run_command(shell)); | |
690 | } | |
691 | #endif | |
692 | ||
dac6753b | 693 | if (s->ttyfd != -1) |
694 | do_exec_pty(s, command); | |
695 | else | |
696 | do_exec_no_pty(s, command); | |
697 | ||
c95add71 | 698 | original_command = NULL; |
dac6753b | 699 | |
be2ca0c9 | 700 | /* |
701 | * Clear loginmsg: it's the child's responsibility to display | |
702 | * it to the user, otherwise multiple sessions may accumulate | |
703 | * multiple copies of the login messages. | |
704 | */ | |
705 | buffer_clear(&loginmsg); | |
706 | } | |
f7342052 | 707 | |
c345cf9d | 708 | /* administrative, login(1)-like work */ |
709 | void | |
a22aff1f | 710 | do_login(Session *s, const char *command) |
c345cf9d | 711 | { |
c345cf9d | 712 | socklen_t fromlen; |
713 | struct sockaddr_storage from; | |
c345cf9d | 714 | struct passwd * pw = s->pw; |
715 | pid_t pid = getpid(); | |
716 | ||
717 | /* | |
718 | * Get IP address of client. If the connection is not a socket, let | |
719 | * the address be 0.0.0.0. | |
720 | */ | |
721 | memset(&from, 0, sizeof(from)); | |
d4ac26ed | 722 | fromlen = sizeof(from); |
c345cf9d | 723 | if (packet_connection_is_on_socket()) { |
c345cf9d | 724 | if (getpeername(packet_get_connection_in(), |
f7342052 | 725 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 726 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 727 | cleanup_exit(255); |
c345cf9d | 728 | } |
729 | } | |
730 | ||
731 | /* Record that there was a login on that tty from the remote host. */ | |
49a34e84 | 732 | if (!use_privsep) |
733 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
734 | get_remote_name_or_ip(utmp_len, | |
c5a7d788 | 735 | options.use_dns), |
ba1566dd | 736 | (struct sockaddr *)&from, fromlen); |
c345cf9d | 737 | |
2919e060 | 738 | #ifdef USE_PAM |
739 | /* | |
740 | * If password change is needed, do it now. | |
741 | * This needs to occur before the ~/.hushlogin check. | |
742 | */ | |
dd1fb864 | 743 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
744 | display_loginmsg(); | |
2919e060 | 745 | do_pam_chauthtok(); |
dd1fb864 | 746 | s->authctxt->force_pwchange = 0; |
5b9e2464 | 747 | /* XXX - signal [net] parent to enable forwardings */ |
2919e060 | 748 | } |
749 | #endif | |
750 | ||
f2c2fd71 | 751 | if (check_quietlogin(s, command)) |
c345cf9d | 752 | return; |
753 | ||
dd1fb864 | 754 | display_loginmsg(); |
c345cf9d | 755 | |
f2c2fd71 | 756 | do_motd(); |
757 | } | |
758 | ||
759 | /* | |
760 | * Display the message of the day. | |
761 | */ | |
762 | void | |
763 | do_motd(void) | |
764 | { | |
765 | FILE *f; | |
766 | char buf[256]; | |
767 | ||
c345cf9d | 768 | if (options.print_motd) { |
2e73a022 | 769 | #ifdef HAVE_LOGIN_CAP |
770 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
771 | "/etc/motd"), "r"); | |
772 | #else | |
c345cf9d | 773 | f = fopen("/etc/motd", "r"); |
2e73a022 | 774 | #endif |
c345cf9d | 775 | if (f) { |
776 | while (fgets(buf, sizeof(buf), f)) | |
777 | fputs(buf, stdout); | |
778 | fclose(f); | |
779 | } | |
780 | } | |
781 | } | |
782 | ||
9c328529 | 783 | |
784 | /* | |
785 | * Check for quiet login, either .hushlogin or command given. | |
786 | */ | |
787 | int | |
788 | check_quietlogin(Session *s, const char *command) | |
789 | { | |
790 | char buf[256]; | |
791 | struct passwd *pw = s->pw; | |
792 | struct stat st; | |
793 | ||
794 | /* Return 1 if .hushlogin exists or a command given. */ | |
795 | if (command != NULL) | |
796 | return 1; | |
797 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
798 | #ifdef HAVE_LOGIN_CAP | |
799 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
800 | return 1; | |
801 | #else | |
802 | if (stat(buf, &st) >= 0) | |
803 | return 1; | |
804 | #endif | |
805 | return 0; | |
806 | } | |
807 | ||
7368a6c8 | 808 | /* |
809 | * Sets the value of the given variable in the environment. If the variable | |
810 | * already exists, its value is overriden. | |
811 | */ | |
7364bd04 | 812 | void |
1e3b8b07 | 813 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
184eed6a | 814 | const char *value) |
7368a6c8 | 815 | { |
7368a6c8 | 816 | char **env; |
c46e584f | 817 | u_int envsize; |
818 | u_int i, namelen; | |
7368a6c8 | 819 | |
95b99395 | 820 | /* |
821 | * If we're passed an uninitialized list, allocate a single null | |
822 | * entry before continuing. | |
823 | */ | |
824 | if (*envp == NULL && *envsizep == 0) { | |
825 | *envp = xmalloc(sizeof(char *)); | |
826 | *envp[0] = NULL; | |
827 | *envsizep = 1; | |
828 | } | |
829 | ||
7368a6c8 | 830 | /* |
831 | * Find the slot where the value should be stored. If the variable | |
832 | * already exists, we reuse the slot; otherwise we append a new slot | |
833 | * at the end of the array, expanding if necessary. | |
834 | */ | |
835 | env = *envp; | |
836 | namelen = strlen(name); | |
837 | for (i = 0; env[i]; i++) | |
838 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
839 | break; | |
840 | if (env[i]) { | |
841 | /* Reuse the slot. */ | |
842 | xfree(env[i]); | |
843 | } else { | |
844 | /* New variable. Expand if necessary. */ | |
c46e584f | 845 | envsize = *envsizep; |
846 | if (i >= envsize - 1) { | |
847 | if (envsize >= 1000) | |
848 | fatal("child_set_env: too many env vars"); | |
849 | envsize += 50; | |
c5d10563 | 850 | env = (*envp) = xrealloc(env, envsize, sizeof(char *)); |
c46e584f | 851 | *envsizep = envsize; |
7368a6c8 | 852 | } |
853 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
854 | env[i + 1] = NULL; | |
855 | } | |
856 | ||
857 | /* Allocate space and format the variable in the appropriate slot. */ | |
858 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
859 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
860 | } | |
861 | ||
862 | /* | |
863 | * Reads environment variables from the given file and adds/overrides them | |
864 | * into the environment. If the file does not exist, this does nothing. | |
865 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
866 | * and assignments of the form name=value. No other forms are allowed. | |
867 | */ | |
396c147e | 868 | static void |
1e3b8b07 | 869 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 870 | const char *filename) |
7368a6c8 | 871 | { |
872 | FILE *f; | |
873 | char buf[4096]; | |
874 | char *cp, *value; | |
66087567 | 875 | u_int lineno = 0; |
7368a6c8 | 876 | |
877 | f = fopen(filename, "r"); | |
878 | if (!f) | |
879 | return; | |
880 | ||
881 | while (fgets(buf, sizeof(buf), f)) { | |
66087567 | 882 | if (++lineno > 1000) |
883 | fatal("Too many lines in environment file %s", filename); | |
7368a6c8 | 884 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
885 | ; | |
886 | if (!*cp || *cp == '#' || *cp == '\n') | |
887 | continue; | |
888 | if (strchr(cp, '\n')) | |
889 | *strchr(cp, '\n') = '\0'; | |
890 | value = strchr(cp, '='); | |
891 | if (value == NULL) { | |
66087567 | 892 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
893 | filename); | |
7368a6c8 | 894 | continue; |
895 | } | |
71276795 | 896 | /* |
897 | * Replace the equals sign by nul, and advance value to | |
898 | * the value string. | |
899 | */ | |
7368a6c8 | 900 | *value = '\0'; |
901 | value++; | |
902 | child_set_env(env, envsize, cp, value); | |
903 | } | |
904 | fclose(f); | |
905 | } | |
906 | ||
95b99395 | 907 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
908 | /* | |
909 | * Return named variable from specified environment, or NULL if not present. | |
910 | */ | |
911 | static char * | |
912 | child_get_env(char **env, const char *name) | |
913 | { | |
914 | int i; | |
915 | size_t len; | |
916 | ||
917 | len = strlen(name); | |
918 | for (i=0; env[i] != NULL; i++) | |
919 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') | |
920 | return(env[i] + len + 1); | |
921 | return NULL; | |
922 | } | |
923 | ||
924 | /* | |
925 | * Read /etc/default/login. | |
926 | * We pick up the PATH (or SUPATH for root) and UMASK. | |
927 | */ | |
928 | static void | |
929 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) | |
930 | { | |
931 | char **tmpenv = NULL, *var; | |
6f99680f | 932 | u_int i, tmpenvsize = 0; |
3a23ba0e | 933 | u_long mask; |
95b99395 | 934 | |
935 | /* | |
936 | * We don't want to copy the whole file to the child's environment, | |
937 | * so we use a temporary environment and copy the variables we're | |
938 | * interested in. | |
939 | */ | |
940 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); | |
941 | ||
6f99680f | 942 | if (tmpenv == NULL) |
943 | return; | |
944 | ||
95b99395 | 945 | if (uid == 0) |
946 | var = child_get_env(tmpenv, "SUPATH"); | |
947 | else | |
948 | var = child_get_env(tmpenv, "PATH"); | |
949 | if (var != NULL) | |
950 | child_set_env(env, envsize, "PATH", var); | |
b6453d99 | 951 | |
95b99395 | 952 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
953 | if (sscanf(var, "%5lo", &mask) == 1) | |
3a23ba0e | 954 | umask((mode_t)mask); |
b6453d99 | 955 | |
95b99395 | 956 | for (i = 0; tmpenv[i] != NULL; i++) |
957 | xfree(tmpenv[i]); | |
958 | xfree(tmpenv); | |
959 | } | |
960 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
961 | ||
1db07e7d | 962 | void |
963 | copy_environment(char **source, char ***env, u_int *envsize) | |
7368a6c8 | 964 | { |
760b35a6 | 965 | char *var_name, *var_val; |
7368a6c8 | 966 | int i; |
967 | ||
760b35a6 | 968 | if (source == NULL) |
7368a6c8 | 969 | return; |
2b87da3b | 970 | |
760b35a6 | 971 | for(i = 0; source[i] != NULL; i++) { |
972 | var_name = xstrdup(source[i]); | |
973 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
974 | xfree(var_name); | |
7368a6c8 | 975 | continue; |
7368a6c8 | 976 | } |
760b35a6 | 977 | *var_val++ = '\0'; |
7368a6c8 | 978 | |
760b35a6 | 979 | debug3("Copy environment: %s=%s", var_name, var_val); |
980 | child_set_env(env, envsize, var_name, var_val); | |
b6453d99 | 981 | |
760b35a6 | 982 | xfree(var_name); |
22d89d24 | 983 | } |
984 | } | |
22d89d24 | 985 | |
f7342052 | 986 | static char ** |
987 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 988 | { |
7368a6c8 | 989 | char buf[256]; |
f7342052 | 990 | u_int i, envsize; |
95b99395 | 991 | char **env, *laddr, *path = NULL; |
f7342052 | 992 | struct passwd *pw = s->pw; |
7368a6c8 | 993 | |
7368a6c8 | 994 | /* Initialize the environment. */ |
995 | envsize = 100; | |
01d35895 | 996 | env = xcalloc(envsize, sizeof(char *)); |
7368a6c8 | 997 | env[0] = NULL; |
998 | ||
3c62e7eb | 999 | #ifdef HAVE_CYGWIN |
1000 | /* | |
1001 | * The Windows environment contains some setting which are | |
1002 | * important for a running system. They must not be dropped. | |
1003 | */ | |
3c502155 | 1004 | { |
1005 | char **p; | |
1006 | ||
1007 | p = fetch_windows_environment(); | |
1008 | copy_environment(p, &env, &envsize); | |
1009 | free_windows_environment(p); | |
1010 | } | |
3c62e7eb | 1011 | #endif |
1012 | ||
7364bd04 | 1013 | #ifdef GSSAPI |
aff51935 | 1014 | /* Allow any GSSAPI methods that we've used to alter |
7364bd04 | 1015 | * the childs environment as they see fit |
1016 | */ | |
1017 | ssh_gssapi_do_child(&env, &envsize); | |
1018 | #endif | |
1019 | ||
7368a6c8 | 1020 | if (!options.use_login) { |
1021 | /* Set basic environment. */ | |
61a2c1da | 1022 | for (i = 0; i < s->num_env; i++) |
f2107e97 | 1023 | child_set_env(&env, &envsize, s->env[i].name, |
61a2c1da | 1024 | s->env[i].val); |
1025 | ||
7368a6c8 | 1026 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
1027 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
17ed08c5 | 1028 | #ifdef _AIX |
1029 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); | |
1030 | #endif | |
7368a6c8 | 1031 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
2e73a022 | 1032 | #ifdef HAVE_LOGIN_CAP |
97686bf9 | 1033 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
1034 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); | |
1035 | else | |
1036 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1037 | #else /* HAVE_LOGIN_CAP */ |
1038 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1039 | /* |
1040 | * There's no standard path on Windows. The path contains | |
1041 | * important components pointing to the system directories, | |
1042 | * needed for loading shared libraries. So the path better | |
1043 | * remains intact here. | |
1044 | */ | |
95b99395 | 1045 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
1046 | read_etc_default_login(&env, &envsize, pw->pw_uid); | |
1047 | path = child_get_env(env, "PATH"); | |
1048 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ | |
1049 | if (path == NULL || *path == '\0') { | |
aff51935 | 1050 | child_set_env(&env, &envsize, "PATH", |
95b99395 | 1051 | s->pw->pw_uid == 0 ? |
1052 | SUPERUSER_PATH : _PATH_STDPATH); | |
1053 | } | |
22d89d24 | 1054 | # endif /* HAVE_CYGWIN */ |
1055 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1056 | |
1057 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1058 | _PATH_MAILDIR, pw->pw_name); | |
1059 | child_set_env(&env, &envsize, "MAIL", buf); | |
1060 | ||
1061 | /* Normal systems set SHELL by default. */ | |
1062 | child_set_env(&env, &envsize, "SHELL", shell); | |
1063 | } | |
1064 | if (getenv("TZ")) | |
1065 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1066 | ||
1067 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 1068 | if (!options.use_login) { |
1069 | while (custom_environment) { | |
1070 | struct envstring *ce = custom_environment; | |
7fdc56c5 | 1071 | char *str = ce->s; |
f7342052 | 1072 | |
7fdc56c5 | 1073 | for (i = 0; str[i] != '=' && str[i]; i++) |
2548961d | 1074 | ; |
7fdc56c5 | 1075 | if (str[i] == '=') { |
1076 | str[i] = 0; | |
1077 | child_set_env(&env, &envsize, str, str + i + 1); | |
2548961d | 1078 | } |
1079 | custom_environment = ce->next; | |
1080 | xfree(ce->s); | |
1081 | xfree(ce); | |
7368a6c8 | 1082 | } |
7368a6c8 | 1083 | } |
1084 | ||
da0561eb | 1085 | /* SSH_CLIENT deprecated */ |
7368a6c8 | 1086 | snprintf(buf, sizeof buf, "%.50s %d %d", |
f7342052 | 1087 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1088 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1089 | ||
3e2f2431 | 1090 | laddr = get_local_ipaddr(packet_get_connection_in()); |
da0561eb | 1091 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
3e2f2431 | 1092 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
1093 | xfree(laddr); | |
da0561eb | 1094 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
1095 | ||
56b3e9ce | 1096 | if (s->ttyfd != -1) |
1097 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1098 | if (s->term) | |
1099 | child_set_env(&env, &envsize, "TERM", s->term); | |
1100 | if (s->display) | |
1101 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1102 | if (original_command) |
1103 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1104 | original_command); | |
7368a6c8 | 1105 | |
ef51930f | 1106 | #ifdef _UNICOS |
1107 | if (cray_tmpdir[0] != '\0') | |
1108 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); | |
1109 | #endif /* _UNICOS */ | |
1110 | ||
3bfd27d5 | 1111 | /* |
1112 | * Since we clear KRB5CCNAME at startup, if it's set now then it | |
1113 | * must have been set by a native authentication method (eg AIX or | |
1114 | * SIA), so copy it to the child. | |
1115 | */ | |
1116 | { | |
1117 | char *cp; | |
1118 | ||
1119 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1120 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1121 | } | |
1122 | ||
7368a6c8 | 1123 | #ifdef _AIX |
4936fcee | 1124 | { |
1125 | char *cp; | |
1126 | ||
1127 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1128 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
4936fcee | 1129 | read_environment_file(&env, &envsize, "/etc/environment"); |
1130 | } | |
7368a6c8 | 1131 | #endif |
ced49be2 | 1132 | #ifdef KRB5 |
6490a5d5 | 1133 | if (s->authctxt->krb5_ccname) |
ced49be2 | 1134 | child_set_env(&env, &envsize, "KRB5CCNAME", |
6490a5d5 | 1135 | s->authctxt->krb5_ccname); |
ced49be2 | 1136 | #endif |
7368a6c8 | 1137 | #ifdef USE_PAM |
ee48c949 | 1138 | /* |
1139 | * Pull in any environment variables that may have | |
1140 | * been set by PAM. | |
1141 | */ | |
7fceb20d | 1142 | if (options.use_pam) { |
2212fc98 | 1143 | char **p; |
b6453d99 | 1144 | |
2212fc98 | 1145 | p = fetch_pam_child_environment(); |
1146 | copy_environment(p, &env, &envsize); | |
1147 | free_pam_environment(p); | |
ee48c949 | 1148 | |
2212fc98 | 1149 | p = fetch_pam_environment(); |
ee48c949 | 1150 | copy_environment(p, &env, &envsize); |
1151 | free_pam_environment(p); | |
1152 | } | |
7368a6c8 | 1153 | #endif /* USE_PAM */ |
1154 | ||
149cdb60 | 1155 | if (auth_sock_name != NULL) |
7368a6c8 | 1156 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1157 | auth_sock_name); |
7368a6c8 | 1158 | |
1159 | /* read $HOME/.ssh/environment. */ | |
f00bab84 | 1160 | if (options.permit_user_env && !options.use_login) { |
71276795 | 1161 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
e2e36358 | 1162 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
7368a6c8 | 1163 | read_environment_file(&env, &envsize, buf); |
1164 | } | |
1165 | if (debug_flag) { | |
1166 | /* dump the environment */ | |
1167 | fprintf(stderr, "Environment:\n"); | |
1168 | for (i = 0; env[i]; i++) | |
1169 | fprintf(stderr, " %.200s\n", env[i]); | |
1170 | } | |
f7342052 | 1171 | return env; |
1172 | } | |
1173 | ||
1174 | /* | |
1175 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1176 | * first in this order). | |
1177 | */ | |
1178 | static void | |
1179 | do_rc_files(Session *s, const char *shell) | |
1180 | { | |
1181 | FILE *f = NULL; | |
1182 | char cmd[1024]; | |
1183 | int do_xauth; | |
1184 | struct stat st; | |
1185 | ||
1186 | do_xauth = | |
1187 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1188 | ||
1189 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1190 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1191 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1192 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1193 | if (debug_flag) | |
1194 | fprintf(stderr, "Running %s\n", cmd); | |
1195 | f = popen(cmd, "w"); | |
1196 | if (f) { | |
1197 | if (do_xauth) | |
1198 | fprintf(f, "%s %s\n", s->auth_proto, | |
1199 | s->auth_data); | |
1200 | pclose(f); | |
1201 | } else | |
1202 | fprintf(stderr, "Could not run %s\n", | |
1203 | _PATH_SSH_USER_RC); | |
1204 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1205 | if (debug_flag) | |
1206 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1207 | _PATH_SSH_SYSTEM_RC); | |
1208 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1209 | if (f) { | |
1210 | if (do_xauth) | |
1211 | fprintf(f, "%s %s\n", s->auth_proto, | |
1212 | s->auth_data); | |
1213 | pclose(f); | |
1214 | } else | |
1215 | fprintf(stderr, "Could not run %s\n", | |
1216 | _PATH_SSH_SYSTEM_RC); | |
1217 | } else if (do_xauth && options.xauth_location != NULL) { | |
1218 | /* Add authority data to .Xauthority if appropriate. */ | |
1219 | if (debug_flag) { | |
1220 | fprintf(stderr, | |
fe661d8f | 1221 | "Running %.500s remove %.100s\n", |
2362db19 | 1222 | options.xauth_location, s->auth_display); |
fe661d8f | 1223 | fprintf(stderr, |
1224 | "%.500s add %.100s %.100s %.100s\n", | |
f7342052 | 1225 | options.xauth_location, s->auth_display, |
1226 | s->auth_proto, s->auth_data); | |
1227 | } | |
1228 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1229 | options.xauth_location); | |
1230 | f = popen(cmd, "w"); | |
1231 | if (f) { | |
fe661d8f | 1232 | fprintf(f, "remove %s\n", |
1233 | s->auth_display); | |
f7342052 | 1234 | fprintf(f, "add %s %s %s\n", |
1235 | s->auth_display, s->auth_proto, | |
1236 | s->auth_data); | |
1237 | pclose(f); | |
1238 | } else { | |
1239 | fprintf(stderr, "Could not run %s\n", | |
1240 | cmd); | |
1241 | } | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | static void | |
1246 | do_nologin(struct passwd *pw) | |
1247 | { | |
1248 | FILE *f = NULL; | |
1249 | char buf[1024]; | |
1250 | ||
1251 | #ifdef HAVE_LOGIN_CAP | |
1252 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1253 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1254 | _PATH_NOLOGIN), "r"); | |
1255 | #else | |
1256 | if (pw->pw_uid) | |
1257 | f = fopen(_PATH_NOLOGIN, "r"); | |
1258 | #endif | |
1259 | if (f) { | |
1260 | /* /etc/nologin exists. Print its contents and exit. */ | |
bbe88b6d | 1261 | logit("User %.100s not allowed because %s exists", |
8bd4e2ae | 1262 | pw->pw_name, _PATH_NOLOGIN); |
f7342052 | 1263 | while (fgets(buf, sizeof(buf), f)) |
1264 | fputs(buf, stderr); | |
1265 | fclose(f); | |
99f4fb69 | 1266 | fflush(NULL); |
f7342052 | 1267 | exit(254); |
1268 | } | |
1269 | } | |
1270 | ||
1271 | /* Set login name, uid, gid, and groups. */ | |
1853d1ef | 1272 | void |
f7342052 | 1273 | do_setusercontext(struct passwd *pw) |
1274 | { | |
2731632a | 1275 | #ifndef HAVE_CYGWIN |
1276 | if (getuid() == 0 || geteuid() == 0) | |
f7342052 | 1277 | #endif /* HAVE_CYGWIN */ |
2731632a | 1278 | { |
1279 | ||
8bbfc882 | 1280 | #ifdef HAVE_SETPCRED |
166baacc | 1281 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
1282 | fatal("Failed to set process credentials"); | |
8bbfc882 | 1283 | #endif /* HAVE_SETPCRED */ |
f7342052 | 1284 | #ifdef HAVE_LOGIN_CAP |
2d199535 | 1285 | # ifdef __bsdi__ |
8695f9f7 | 1286 | setpgid(0, 0); |
2d199535 | 1287 | # endif |
09d7ebd1 | 1288 | #ifdef GSSAPI |
1289 | if (options.gss_authentication) { | |
1290 | temporarily_use_uid(pw); | |
1291 | ssh_gssapi_storecreds(); | |
1292 | restore_uid(); | |
1293 | } | |
1294 | #endif | |
f4eaee12 | 1295 | # ifdef USE_PAM |
1296 | if (options.use_pam) { | |
1297 | do_pam_session(); | |
1298 | do_pam_setcred(0); | |
1299 | } | |
1300 | # endif /* USE_PAM */ | |
f7342052 | 1301 | if (setusercontext(lc, pw, pw->pw_uid, |
1302 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1303 | perror("unable to set user context"); | |
1304 | exit(1); | |
1305 | } | |
1306 | #else | |
1307 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1308 | /* Sets login uid for accounting */ | |
1309 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1310 | error("setluid: %s", strerror(errno)); | |
1311 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1312 | ||
1313 | if (setlogin(pw->pw_name) < 0) | |
1314 | error("setlogin failed: %s", strerror(errno)); | |
1315 | if (setgid(pw->pw_gid) < 0) { | |
1316 | perror("setgid"); | |
1317 | exit(1); | |
1318 | } | |
1319 | /* Initialize the group list. */ | |
1320 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1321 | perror("initgroups"); | |
1322 | exit(1); | |
1323 | } | |
1324 | endgrent(); | |
09d7ebd1 | 1325 | #ifdef GSSAPI |
1326 | if (options.gss_authentication) { | |
1327 | temporarily_use_uid(pw); | |
1328 | ssh_gssapi_storecreds(); | |
1329 | restore_uid(); | |
1330 | } | |
1331 | #endif | |
f7342052 | 1332 | # ifdef USE_PAM |
1333 | /* | |
aff51935 | 1334 | * PAM credentials may take the form of supplementary groups. |
f7342052 | 1335 | * These will have been wiped by the above initgroups() call. |
1336 | * Reestablish them here. | |
1337 | */ | |
49e82bb9 | 1338 | if (options.use_pam) { |
1339 | do_pam_session(); | |
7fceb20d | 1340 | do_pam_setcred(0); |
49e82bb9 | 1341 | } |
f7342052 | 1342 | # endif /* USE_PAM */ |
1343 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1344 | irix_setusercontext(pw); | |
1345 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
e2bc41f9 | 1346 | # ifdef _AIX |
0ba40daa | 1347 | aix_usrinfo(pw); |
e2bc41f9 | 1348 | # endif /* _AIX */ |
26d07095 | 1349 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
4c653d8e | 1350 | if (set_id(pw->pw_name) != 0) { |
1351 | exit(1); | |
1352 | } | |
26d07095 | 1353 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ |
f7342052 | 1354 | /* Permanently switch to the desired uid. */ |
1355 | permanently_set_uid(pw); | |
1356 | #endif | |
1357 | } | |
2731632a | 1358 | |
1359 | #ifdef HAVE_CYGWIN | |
1360 | if (is_winnt) | |
1361 | #endif | |
f7342052 | 1362 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
1363 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
ef4d1846 | 1364 | |
1365 | #ifdef WITH_SELINUX | |
1366 | ssh_selinux_setup_exec_context(pw->pw_name); | |
1367 | #endif | |
f7342052 | 1368 | } |
1369 | ||
37656beb | 1370 | static void |
1371 | do_pwchange(Session *s) | |
1372 | { | |
be2ca0c9 | 1373 | fflush(NULL); |
37656beb | 1374 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
1375 | if (s->ttyfd != -1) { | |
f2107e97 | 1376 | fprintf(stderr, |
37656beb | 1377 | "You must change your password now and login again!\n"); |
3ade3b57 | 1378 | #ifdef PASSWD_NEEDS_USERNAME |
1379 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, | |
1380 | (char *)NULL); | |
1381 | #else | |
37656beb | 1382 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
3ade3b57 | 1383 | #endif |
37656beb | 1384 | perror("passwd"); |
1385 | } else { | |
1386 | fprintf(stderr, | |
1387 | "Password change required but no TTY available.\n"); | |
1388 | } | |
1389 | exit(1); | |
1390 | } | |
1391 | ||
51aeb639 | 1392 | static void |
1853d1ef | 1393 | launch_login(struct passwd *pw, const char *hostname) |
1394 | { | |
1395 | /* Launch login(1). */ | |
1396 | ||
85cc9118 | 1397 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1398 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1399 | (s->term ? s->term : "unknown"), |
1853d1ef | 1400 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1401 | #ifdef LOGIN_NO_ENDOPT |
1402 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1403 | #else | |
1853d1ef | 1404 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1405 | #endif |
1853d1ef | 1406 | |
1407 | /* Login couldn't be executed, die. */ | |
1408 | ||
1409 | perror("login"); | |
1410 | exit(1); | |
1411 | } | |
1412 | ||
37656beb | 1413 | static void |
1414 | child_close_fds(void) | |
1415 | { | |
1416 | int i; | |
1417 | ||
1418 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1419 | close(packet_get_connection_in()); | |
1420 | else { | |
1421 | close(packet_get_connection_in()); | |
1422 | close(packet_get_connection_out()); | |
1423 | } | |
1424 | /* | |
1425 | * Close all descriptors related to channels. They will still remain | |
1426 | * open in the parent. | |
1427 | */ | |
1428 | /* XXX better use close-on-exec? -markus */ | |
1429 | channel_close_all(); | |
1430 | ||
1431 | /* | |
1432 | * Close any extra file descriptors. Note that there may still be | |
1433 | * descriptors left by system functions. They will be closed later. | |
1434 | */ | |
1435 | endpwent(); | |
1436 | ||
1437 | /* | |
7b9b0103 | 1438 | * Close any extra open file descriptors so that we don't have them |
37656beb | 1439 | * hanging around in clients. Note that we want to do this after |
1440 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1441 | * descriptors open. | |
1442 | */ | |
1443 | for (i = 3; i < 64; i++) | |
1444 | close(i); | |
1445 | } | |
1446 | ||
f7342052 | 1447 | /* |
1448 | * Performs common processing for the child, such as setting up the | |
1449 | * environment, closing extra file descriptors, setting the user and group | |
1450 | * ids, and executing the command or shell. | |
1451 | */ | |
1452 | void | |
1453 | do_child(Session *s, const char *command) | |
1454 | { | |
1455 | extern char **environ; | |
1456 | char **env; | |
1457 | char *argv[10]; | |
1458 | const char *shell, *shell0, *hostname = NULL; | |
1459 | struct passwd *pw = s->pw; | |
f7342052 | 1460 | |
1461 | /* remove hostkey from the child's memory */ | |
1462 | destroy_sensitive_data(); | |
1463 | ||
37656beb | 1464 | /* Force a password change */ |
1465 | if (s->authctxt->force_pwchange) { | |
1466 | do_setusercontext(pw); | |
1467 | child_close_fds(); | |
1468 | do_pwchange(s); | |
1469 | exit(1); | |
1470 | } | |
1471 | ||
f7342052 | 1472 | /* login(1) is only called if we execute the login shell */ |
1473 | if (options.use_login && command != NULL) | |
1474 | options.use_login = 0; | |
1475 | ||
ef51930f | 1476 | #ifdef _UNICOS |
1477 | cray_setup(pw->pw_uid, pw->pw_name, command); | |
1478 | #endif /* _UNICOS */ | |
1479 | ||
f7342052 | 1480 | /* |
1481 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1482 | * switch, so we let login(1) to this for us. | |
1483 | */ | |
1484 | if (!options.use_login) { | |
1485 | #ifdef HAVE_OSF_SIA | |
58d0df4e | 1486 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
f7342052 | 1487 | if (!check_quietlogin(s, command)) |
1488 | do_motd(); | |
1489 | #else /* HAVE_OSF_SIA */ | |
0a61a240 | 1490 | /* When PAM is enabled we rely on it to do the nologin check */ |
1491 | if (!options.use_pam) | |
1492 | do_nologin(pw); | |
f7342052 | 1493 | do_setusercontext(pw); |
25bfd4ff | 1494 | /* |
1495 | * PAM session modules in do_setusercontext may have | |
1496 | * generated messages, so if this in an interactive | |
1497 | * login then display them too. | |
1498 | */ | |
d0c890ac | 1499 | if (!check_quietlogin(s, command)) |
25bfd4ff | 1500 | display_loginmsg(); |
f7342052 | 1501 | #endif /* HAVE_OSF_SIA */ |
1502 | } | |
1503 | ||
abdec250 | 1504 | #ifdef USE_PAM |
d9720710 | 1505 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
1506 | debug3("PAM session not opened, exiting"); | |
abdec250 | 1507 | display_loginmsg(); |
1508 | exit(254); | |
1509 | } | |
1510 | #endif | |
1511 | ||
f7342052 | 1512 | /* |
1513 | * Get the shell from the password data. An empty shell field is | |
1514 | * legal, and means /bin/sh. | |
1515 | */ | |
1516 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
32214c88 | 1517 | |
1518 | /* | |
1519 | * Make sure $SHELL points to the shell from the password file, | |
1520 | * even if shell is overridden from login.conf | |
1521 | */ | |
1522 | env = do_setup_env(s, shell); | |
1523 | ||
f7342052 | 1524 | #ifdef HAVE_LOGIN_CAP |
1525 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1526 | #endif | |
1527 | ||
2e73a022 | 1528 | /* we have to stash the hostname before we close our socket. */ |
1529 | if (options.use_login) | |
46e3af7f | 1530 | hostname = get_remote_name_or_ip(utmp_len, |
c5a7d788 | 1531 | options.use_dns); |
7368a6c8 | 1532 | /* |
1533 | * Close the connection descriptors; note that this is the child, and | |
1534 | * the server will still have the socket open, and it is important | |
1535 | * that we do not shutdown it. Note that the descriptors cannot be | |
1536 | * closed before building the environment, as we call | |
1537 | * get_remote_ipaddr there. | |
1538 | */ | |
37656beb | 1539 | child_close_fds(); |
7368a6c8 | 1540 | |
7368a6c8 | 1541 | /* |
2a8a6488 | 1542 | * Must take new environment into use so that .ssh/rc, |
1543 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1544 | */ |
1545 | environ = env; | |
1546 | ||
bcfcc5f9 | 1547 | #if defined(KRB5) && defined(USE_AFS) |
a1e30b47 | 1548 | /* |
1549 | * At this point, we check to see if AFS is active and if we have | |
1550 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see | |
1551 | * if we can (and need to) extend the ticket into an AFS token. If | |
1552 | * we don't do this, we run into potential problems if the user's | |
1553 | * home directory is in AFS and it's not world-readable. | |
1554 | */ | |
1555 | ||
1556 | if (options.kerberos_get_afs_token && k_hasafs() && | |
4e2e5cfd | 1557 | (s->authctxt->krb5_ctx != NULL)) { |
a1e30b47 | 1558 | char cell[64]; |
1559 | ||
1560 | debug("Getting AFS token"); | |
1561 | ||
1562 | k_setpag(); | |
1563 | ||
1564 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1565 | krb5_afslog(s->authctxt->krb5_ctx, | |
1566 | s->authctxt->krb5_fwd_ccache, cell, NULL); | |
1567 | ||
1568 | krb5_afslog_home(s->authctxt->krb5_ctx, | |
1569 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); | |
1570 | } | |
1571 | #endif | |
1572 | ||
7b9b0103 | 1573 | /* Change current directory to the user's home directory. */ |
dab89049 | 1574 | if (chdir(pw->pw_dir) < 0) { |
1575 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1576 | pw->pw_dir, strerror(errno)); | |
1577 | #ifdef HAVE_LOGIN_CAP | |
1578 | if (login_getcapbool(lc, "requirehome", 0)) | |
1579 | exit(1); | |
1580 | #endif | |
1581 | } | |
1582 | ||
f7342052 | 1583 | if (!options.use_login) |
1584 | do_rc_files(s, shell); | |
1d3c30db | 1585 | |
1586 | /* restore SIGPIPE for child */ | |
1587 | signal(SIGPIPE, SIG_DFL); | |
1588 | ||
f7342052 | 1589 | if (options.use_login) { |
1853d1ef | 1590 | launch_login(pw, hostname); |
1591 | /* NEVERREACHED */ | |
f7342052 | 1592 | } |
1593 | ||
1594 | /* Get the last component of the shell name. */ | |
1595 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1596 | shell0++; | |
1597 | else | |
1598 | shell0 = shell; | |
1599 | ||
7368a6c8 | 1600 | /* |
1601 | * If we have no command, execute the shell. In this case, the shell | |
1602 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1603 | * this is a login shell. | |
1604 | */ | |
1605 | if (!command) { | |
f7342052 | 1606 | char argv0[256]; |
7368a6c8 | 1607 | |
f7342052 | 1608 | /* Start the shell. Set initial character to '-'. */ |
1609 | argv0[0] = '-'; | |
7368a6c8 | 1610 | |
f7342052 | 1611 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1612 | >= sizeof(argv0) - 1) { | |
1613 | errno = EINVAL; | |
7368a6c8 | 1614 | perror(shell); |
1615 | exit(1); | |
f7342052 | 1616 | } |
7368a6c8 | 1617 | |
f7342052 | 1618 | /* Execute the shell. */ |
1619 | argv[0] = argv0; | |
1620 | argv[1] = NULL; | |
1621 | execve(shell, argv, env); | |
7368a6c8 | 1622 | |
f7342052 | 1623 | /* Executing the shell failed. */ |
1624 | perror(shell); | |
1625 | exit(1); | |
7368a6c8 | 1626 | } |
1627 | /* | |
1628 | * Execute the command using the user's shell. This uses the -c | |
1629 | * option to execute the command. | |
1630 | */ | |
f7342052 | 1631 | argv[0] = (char *) shell0; |
7368a6c8 | 1632 | argv[1] = "-c"; |
1633 | argv[2] = (char *) command; | |
1634 | argv[3] = NULL; | |
1635 | execve(shell, argv, env); | |
1636 | perror(shell); | |
1637 | exit(1); | |
1638 | } | |
1639 | ||
1640 | Session * | |
1641 | session_new(void) | |
1642 | { | |
1643 | int i; | |
1644 | static int did_init = 0; | |
1645 | if (!did_init) { | |
1646 | debug("session_new: init"); | |
184eed6a | 1647 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1648 | sessions[i].used = 0; |
7368a6c8 | 1649 | } |
1650 | did_init = 1; | |
1651 | } | |
184eed6a | 1652 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1653 | Session *s = &sessions[i]; |
1654 | if (! s->used) { | |
690d0d7f | 1655 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1656 | s->chanid = -1; |
1657 | s->ptyfd = -1; | |
1658 | s->ttyfd = -1; | |
7368a6c8 | 1659 | s->used = 1; |
86066315 | 1660 | s->self = i; |
d08341e6 | 1661 | s->x11_chanids = NULL; |
02323c45 | 1662 | debug("session_new: session %d", i); |
7368a6c8 | 1663 | return s; |
1664 | } | |
1665 | } | |
1666 | return NULL; | |
1667 | } | |
1668 | ||
396c147e | 1669 | static void |
7368a6c8 | 1670 | session_dump(void) |
1671 | { | |
1672 | int i; | |
184eed6a | 1673 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1674 | Session *s = &sessions[i]; |
c457707e | 1675 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1676 | s->used, |
1677 | s->self, | |
1678 | s, | |
1679 | s->chanid, | |
c457707e | 1680 | (long)s->pid); |
7368a6c8 | 1681 | } |
1682 | } | |
1683 | ||
e78a59f5 | 1684 | int |
57156994 | 1685 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1686 | { |
1687 | Session *s = session_new(); | |
1688 | debug("session_open: channel %d", chanid); | |
1689 | if (s == NULL) { | |
1690 | error("no more sessions"); | |
1691 | return 0; | |
1692 | } | |
57156994 | 1693 | s->authctxt = authctxt; |
1694 | s->pw = authctxt->pw; | |
fdaef11e | 1695 | if (s->pw == NULL || !authctxt->valid) |
0725ea77 | 1696 | fatal("no user for session %d", s->self); |
0b242b12 | 1697 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1698 | s->chanid = chanid; | |
e78a59f5 | 1699 | return 1; |
1700 | } | |
1701 | ||
1853d1ef | 1702 | Session * |
1703 | session_by_tty(char *tty) | |
1704 | { | |
1705 | int i; | |
1706 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1707 | Session *s = &sessions[i]; | |
1708 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1709 | debug("session_by_tty: session %d tty %s", i, tty); | |
1710 | return s; | |
1711 | } | |
1712 | } | |
1713 | debug("session_by_tty: unknown tty %.100s", tty); | |
1714 | session_dump(); | |
1715 | return NULL; | |
1716 | } | |
1717 | ||
396c147e | 1718 | static Session * |
e78a59f5 | 1719 | session_by_channel(int id) |
1720 | { | |
1721 | int i; | |
184eed6a | 1722 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1723 | Session *s = &sessions[i]; |
1724 | if (s->used && s->chanid == id) { | |
1725 | debug("session_by_channel: session %d channel %d", i, id); | |
1726 | return s; | |
1727 | } | |
1728 | } | |
1729 | debug("session_by_channel: unknown channel %d", id); | |
1730 | session_dump(); | |
1731 | return NULL; | |
1732 | } | |
1733 | ||
d08341e6 | 1734 | static Session * |
1735 | session_by_x11_channel(int id) | |
1736 | { | |
1737 | int i, j; | |
1738 | ||
1739 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1740 | Session *s = &sessions[i]; | |
1741 | ||
1742 | if (s->x11_chanids == NULL || !s->used) | |
1743 | continue; | |
1744 | for (j = 0; s->x11_chanids[j] != -1; j++) { | |
1745 | if (s->x11_chanids[j] == id) { | |
1746 | debug("session_by_x11_channel: session %d " | |
1747 | "channel %d", s->self, id); | |
1748 | return s; | |
1749 | } | |
1750 | } | |
1751 | } | |
1752 | debug("session_by_x11_channel: unknown channel %d", id); | |
1753 | session_dump(); | |
1754 | return NULL; | |
1755 | } | |
1756 | ||
396c147e | 1757 | static Session * |
e78a59f5 | 1758 | session_by_pid(pid_t pid) |
1759 | { | |
1760 | int i; | |
c457707e | 1761 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1762 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1763 | Session *s = &sessions[i]; |
1764 | if (s->used && s->pid == pid) | |
1765 | return s; | |
1766 | } | |
c457707e | 1767 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1768 | session_dump(); |
1769 | return NULL; | |
1770 | } | |
1771 | ||
396c147e | 1772 | static int |
e78a59f5 | 1773 | session_window_change_req(Session *s) |
1774 | { | |
1775 | s->col = packet_get_int(); | |
1776 | s->row = packet_get_int(); | |
1777 | s->xpixel = packet_get_int(); | |
1778 | s->ypixel = packet_get_int(); | |
95500969 | 1779 | packet_check_eom(); |
e78a59f5 | 1780 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1781 | return 1; | |
1782 | } | |
1783 | ||
396c147e | 1784 | static int |
e78a59f5 | 1785 | session_pty_req(Session *s) |
1786 | { | |
1e3b8b07 | 1787 | u_int len; |
30dcc918 | 1788 | int n_bytes; |
762715ce | 1789 | |
653d5f86 | 1790 | if (no_pty_flag) { |
1791 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1792 | return 0; |
653d5f86 | 1793 | } |
1794 | if (s->ttyfd != -1) { | |
1795 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1796 | return 0; |
653d5f86 | 1797 | } |
1798 | ||
e78a59f5 | 1799 | s->term = packet_get_string(&len); |
653d5f86 | 1800 | |
1801 | if (compat20) { | |
1802 | s->col = packet_get_int(); | |
1803 | s->row = packet_get_int(); | |
1804 | } else { | |
1805 | s->row = packet_get_int(); | |
1806 | s->col = packet_get_int(); | |
1807 | } | |
e78a59f5 | 1808 | s->xpixel = packet_get_int(); |
1809 | s->ypixel = packet_get_int(); | |
1810 | ||
1811 | if (strcmp(s->term, "") == 0) { | |
1812 | xfree(s->term); | |
1813 | s->term = NULL; | |
1814 | } | |
653d5f86 | 1815 | |
e78a59f5 | 1816 | /* Allocate a pty and open it. */ |
653d5f86 | 1817 | debug("Allocating pty."); |
1853d1ef | 1818 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1819 | if (s->term) |
1820 | xfree(s->term); | |
e78a59f5 | 1821 | s->term = NULL; |
1822 | s->ptyfd = -1; | |
1823 | s->ttyfd = -1; | |
1824 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1825 | return 0; |
e78a59f5 | 1826 | } |
1827 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1828 | |
1829 | /* for SSH1 the tty modes length is not given */ | |
1830 | if (!compat20) | |
1831 | n_bytes = packet_remaining(); | |
1832 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1833 | ||
1853d1ef | 1834 | if (!use_privsep) |
1835 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1836 | |
1837 | /* Set window size from the packet. */ | |
e78a59f5 | 1838 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1839 | ||
95500969 | 1840 | packet_check_eom(); |
1d1ffb87 | 1841 | session_proctitle(s); |
e78a59f5 | 1842 | return 1; |
1843 | } | |
1844 | ||
396c147e | 1845 | static int |
0b242b12 | 1846 | session_subsystem_req(Session *s) |
1847 | { | |
01855277 | 1848 | struct stat st; |
1e3b8b07 | 1849 | u_int len; |
0b242b12 | 1850 | int success = 0; |
d66ce1a1 | 1851 | char *prog, *cmd, *subsys = packet_get_string(&len); |
2ceb8101 | 1852 | u_int i; |
0b242b12 | 1853 | |
95500969 | 1854 | packet_check_eom(); |
bbe88b6d | 1855 | logit("subsystem request for %.100s", subsys); |
0b242b12 | 1856 | |
38c295d6 | 1857 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1858 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
d66ce1a1 | 1859 | prog = options.subsystem_command[i]; |
1860 | cmd = options.subsystem_args[i]; | |
1861 | if (stat(prog, &st) < 0) { | |
1862 | error("subsystem: cannot stat %s: %s", prog, | |
01855277 | 1863 | strerror(errno)); |
1864 | break; | |
1865 | } | |
1866 | debug("subsystem: exec() %s", cmd); | |
e5d7a405 | 1867 | s->is_subsystem = 1; |
01855277 | 1868 | do_exec(s, cmd); |
38c295d6 | 1869 | success = 1; |
24932ee9 | 1870 | break; |
38c295d6 | 1871 | } |
1872 | } | |
1873 | ||
1874 | if (!success) | |
bbe88b6d | 1875 | logit("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1876 | subsys); |
38c295d6 | 1877 | |
0b242b12 | 1878 | xfree(subsys); |
1879 | return success; | |
1880 | } | |
1881 | ||
396c147e | 1882 | static int |
0b242b12 | 1883 | session_x11_req(Session *s) |
1884 | { | |
8dcd9d5c | 1885 | int success; |
0b242b12 | 1886 | |
d08341e6 | 1887 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
1888 | error("session_x11_req: session %d: " | |
8918b906 | 1889 | "x11 forwarding already active", s->self); |
d08341e6 | 1890 | return 0; |
1891 | } | |
0b242b12 | 1892 | s->single_connection = packet_get_char(); |
1893 | s->auth_proto = packet_get_string(NULL); | |
1894 | s->auth_data = packet_get_string(NULL); | |
1895 | s->screen = packet_get_int(); | |
95500969 | 1896 | packet_check_eom(); |
0b242b12 | 1897 | |
8dcd9d5c | 1898 | success = session_setup_x11fwd(s); |
1899 | if (!success) { | |
0b242b12 | 1900 | xfree(s->auth_proto); |
1901 | xfree(s->auth_data); | |
1500bcdd | 1902 | s->auth_proto = NULL; |
1903 | s->auth_data = NULL; | |
0b242b12 | 1904 | } |
8dcd9d5c | 1905 | return success; |
0b242b12 | 1906 | } |
1907 | ||
396c147e | 1908 | static int |
38c295d6 | 1909 | session_shell_req(Session *s) |
1910 | { | |
95500969 | 1911 | packet_check_eom(); |
dac6753b | 1912 | do_exec(s, NULL); |
38c295d6 | 1913 | return 1; |
1914 | } | |
1915 | ||
396c147e | 1916 | static int |
38c295d6 | 1917 | session_exec_req(Session *s) |
1918 | { | |
1e3b8b07 | 1919 | u_int len; |
38c295d6 | 1920 | char *command = packet_get_string(&len); |
95500969 | 1921 | packet_check_eom(); |
dac6753b | 1922 | do_exec(s, command); |
c95add71 | 1923 | xfree(command); |
38c295d6 | 1924 | return 1; |
1925 | } | |
1926 | ||
16a79097 | 1927 | static int |
1928 | session_break_req(Session *s) | |
1929 | { | |
16a79097 | 1930 | |
f6be21a0 | 1931 | packet_get_int(); /* ignored */ |
16a79097 | 1932 | packet_check_eom(); |
1933 | ||
8168a86a | 1934 | if (s->ttyfd == -1 || |
1935 | tcsendbreak(s->ttyfd, 0) < 0) | |
16a79097 | 1936 | return 0; |
16a79097 | 1937 | return 1; |
1938 | } | |
1939 | ||
61a2c1da | 1940 | static int |
1941 | session_env_req(Session *s) | |
1942 | { | |
1943 | char *name, *val; | |
1944 | u_int name_len, val_len, i; | |
1945 | ||
1946 | name = packet_get_string(&name_len); | |
1947 | val = packet_get_string(&val_len); | |
1948 | packet_check_eom(); | |
1949 | ||
1950 | /* Don't set too many environment variables */ | |
1951 | if (s->num_env > 128) { | |
1952 | debug2("Ignoring env request %s: too many env vars", name); | |
1953 | goto fail; | |
1954 | } | |
1955 | ||
1956 | for (i = 0; i < options.num_accept_env; i++) { | |
1957 | if (match_pattern(name, options.accept_env[i])) { | |
1958 | debug2("Setting env %d: %s=%s", s->num_env, name, val); | |
c5d10563 | 1959 | s->env = xrealloc(s->env, s->num_env + 1, |
1960 | sizeof(*s->env)); | |
61a2c1da | 1961 | s->env[s->num_env].name = name; |
1962 | s->env[s->num_env].val = val; | |
1963 | s->num_env++; | |
1964 | return (1); | |
1965 | } | |
1966 | } | |
1967 | debug2("Ignoring env request %s: disallowed name", name); | |
1968 | ||
1969 | fail: | |
1970 | xfree(name); | |
1971 | xfree(val); | |
1972 | return (0); | |
1973 | } | |
1974 | ||
396c147e | 1975 | static int |
fa08c86b | 1976 | session_auth_agent_req(Session *s) |
1977 | { | |
1978 | static int called = 0; | |
95500969 | 1979 | packet_check_eom(); |
d343d900 | 1980 | if (no_agent_forwarding_flag) { |
1981 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1982 | return 0; | |
1983 | } | |
fa08c86b | 1984 | if (called) { |
1985 | return 0; | |
1986 | } else { | |
1987 | called = 1; | |
1988 | return auth_input_request_forwarding(s->pw); | |
1989 | } | |
1990 | } | |
1991 | ||
7899c98f | 1992 | int |
1993 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 1994 | { |
e78a59f5 | 1995 | int success = 0; |
e78a59f5 | 1996 | Session *s; |
e78a59f5 | 1997 | |
7899c98f | 1998 | if ((s = session_by_channel(c->self)) == NULL) { |
bbe88b6d | 1999 | logit("session_input_channel_req: no session %d req %.100s", |
7899c98f | 2000 | c->self, rtype); |
2001 | return 0; | |
2002 | } | |
2003 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 2004 | |
2005 | /* | |
e5d7a405 | 2006 | * a session is in LARVAL state until a shell, a command |
2007 | * or a subsystem is executed | |
e78a59f5 | 2008 | */ |
2009 | if (c->type == SSH_CHANNEL_LARVAL) { | |
2010 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 2011 | success = session_shell_req(s); |
e78a59f5 | 2012 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 2013 | success = session_exec_req(s); |
e78a59f5 | 2014 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 2015 | success = session_pty_req(s); |
0b242b12 | 2016 | } else if (strcmp(rtype, "x11-req") == 0) { |
2017 | success = session_x11_req(s); | |
fa08c86b | 2018 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
2019 | success = session_auth_agent_req(s); | |
0b242b12 | 2020 | } else if (strcmp(rtype, "subsystem") == 0) { |
2021 | success = session_subsystem_req(s); | |
61a2c1da | 2022 | } else if (strcmp(rtype, "env") == 0) { |
2023 | success = session_env_req(s); | |
e78a59f5 | 2024 | } |
2025 | } | |
2026 | if (strcmp(rtype, "window-change") == 0) { | |
2027 | success = session_window_change_req(s); | |
c6c76c99 | 2028 | } else if (strcmp(rtype, "break") == 0) { |
2029 | success = session_break_req(s); | |
e78a59f5 | 2030 | } |
c6c76c99 | 2031 | |
7899c98f | 2032 | return success; |
e78a59f5 | 2033 | } |
2034 | ||
2035 | void | |
2036 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
2037 | { | |
2038 | if (!compat20) | |
2039 | fatal("session_set_fds: called for proto != 2.0"); | |
2040 | /* | |
2041 | * now that have a child and a pipe to the child, | |
2042 | * we can activate our channel and register the fd's | |
2043 | */ | |
2044 | if (s->chanid == -1) | |
2045 | fatal("no channel for session %d", s->self); | |
2046 | channel_set_fds(s->chanid, | |
2047 | fdout, fdin, fderr, | |
a22aff1f | 2048 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 2049 | 1, |
2050 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 2051 | } |
2052 | ||
86066315 | 2053 | /* |
2054 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
2055 | * (e.g., due to a dropped connection). | |
2056 | */ | |
1853d1ef | 2057 | void |
2362db19 | 2058 | session_pty_cleanup2(Session *s) |
7368a6c8 | 2059 | { |
86066315 | 2060 | if (s == NULL) { |
2061 | error("session_pty_cleanup: no session"); | |
2062 | return; | |
2063 | } | |
2064 | if (s->ttyfd == -1) | |
7368a6c8 | 2065 | return; |
2066 | ||
0725ea77 | 2067 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 2068 | |
7368a6c8 | 2069 | /* Record that the user has logged out. */ |
86066315 | 2070 | if (s->pid != 0) |
f3837bc6 | 2071 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 2072 | |
2073 | /* Release the pseudo-tty. */ | |
1853d1ef | 2074 | if (getuid() == 0) |
2075 | pty_release(s->tty); | |
7368a6c8 | 2076 | |
2077 | /* | |
2078 | * Close the server side of the socket pairs. We must do this after | |
2079 | * the pty cleanup, so that another process doesn't get this pty | |
2080 | * while we're still cleaning up. | |
2081 | */ | |
2082 | if (close(s->ptymaster) < 0) | |
1853d1ef | 2083 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 2084 | |
2085 | /* unlink pty from session */ | |
2086 | s->ttyfd = -1; | |
7368a6c8 | 2087 | } |
e78a59f5 | 2088 | |
1853d1ef | 2089 | void |
2362db19 | 2090 | session_pty_cleanup(Session *s) |
1853d1ef | 2091 | { |
2362db19 | 2092 | PRIVSEP(session_pty_cleanup2(s)); |
1853d1ef | 2093 | } |
2094 | ||
6c723e7c | 2095 | static char * |
2096 | sig2name(int sig) | |
2097 | { | |
2098 | #define SSH_SIG(x) if (sig == SIG ## x) return #x | |
2099 | SSH_SIG(ABRT); | |
2100 | SSH_SIG(ALRM); | |
2101 | SSH_SIG(FPE); | |
2102 | SSH_SIG(HUP); | |
2103 | SSH_SIG(ILL); | |
2104 | SSH_SIG(INT); | |
2105 | SSH_SIG(KILL); | |
2106 | SSH_SIG(PIPE); | |
2107 | SSH_SIG(QUIT); | |
2108 | SSH_SIG(SEGV); | |
2109 | SSH_SIG(TERM); | |
2110 | SSH_SIG(USR1); | |
2111 | SSH_SIG(USR2); | |
2112 | #undef SSH_SIG | |
2113 | return "SIG@openssh.com"; | |
2114 | } | |
2115 | ||
d08341e6 | 2116 | static void |
2117 | session_close_x11(int id) | |
2118 | { | |
2119 | Channel *c; | |
2120 | ||
b872f7f0 | 2121 | if ((c = channel_by_id(id)) == NULL) { |
d08341e6 | 2122 | debug("session_close_x11: x11 channel %d missing", id); |
2123 | } else { | |
2124 | /* Detach X11 listener */ | |
2125 | debug("session_close_x11: detach x11 channel %d", id); | |
2126 | channel_cancel_cleanup(id); | |
2127 | if (c->ostate != CHAN_OUTPUT_CLOSED) | |
2128 | chan_mark_dead(c); | |
2129 | } | |
2130 | } | |
2131 | ||
2132 | static void | |
2133 | session_close_single_x11(int id, void *arg) | |
2134 | { | |
2135 | Session *s; | |
2136 | u_int i; | |
2137 | ||
2138 | debug3("session_close_single_x11: channel %d", id); | |
2139 | channel_cancel_cleanup(id); | |
2140 | if ((s = session_by_x11_channel(id)) == NULL) | |
2141 | fatal("session_close_single_x11: no x11 channel %d", id); | |
2142 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2143 | debug("session_close_single_x11: session %d: " | |
2144 | "closing channel %d", s->self, s->x11_chanids[i]); | |
2145 | /* | |
2146 | * The channel "id" is already closing, but make sure we | |
2147 | * close all of its siblings. | |
2148 | */ | |
2149 | if (s->x11_chanids[i] != id) | |
2150 | session_close_x11(s->x11_chanids[i]); | |
2151 | } | |
2152 | xfree(s->x11_chanids); | |
2153 | s->x11_chanids = NULL; | |
2154 | if (s->display) { | |
2155 | xfree(s->display); | |
2156 | s->display = NULL; | |
2157 | } | |
2158 | if (s->auth_proto) { | |
2159 | xfree(s->auth_proto); | |
2160 | s->auth_proto = NULL; | |
2161 | } | |
2162 | if (s->auth_data) { | |
2163 | xfree(s->auth_data); | |
2164 | s->auth_data = NULL; | |
2165 | } | |
2166 | if (s->auth_display) { | |
2167 | xfree(s->auth_display); | |
2168 | s->auth_display = NULL; | |
2169 | } | |
2170 | } | |
2171 | ||
396c147e | 2172 | static void |
e78a59f5 | 2173 | session_exit_message(Session *s, int status) |
2174 | { | |
2175 | Channel *c; | |
5a4ae906 | 2176 | |
2177 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 2178 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 2179 | s->self, s->chanid); |
c457707e | 2180 | debug("session_exit_message: session %d channel %d pid %ld", |
2181 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 2182 | |
2183 | if (WIFEXITED(status)) { | |
5a4ae906 | 2184 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 2185 | packet_put_int(WEXITSTATUS(status)); |
2186 | packet_send(); | |
2187 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 2188 | channel_request_start(s->chanid, "exit-signal", 0); |
6c723e7c | 2189 | packet_put_cstring(sig2name(WTERMSIG(status))); |
a64009ad | 2190 | #ifdef WCOREDUMP |
e78a59f5 | 2191 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 2192 | #else /* WCOREDUMP */ |
2193 | packet_put_char(0); | |
2194 | #endif /* WCOREDUMP */ | |
e78a59f5 | 2195 | packet_put_cstring(""); |
2196 | packet_put_cstring(""); | |
2197 | packet_send(); | |
2198 | } else { | |
2199 | /* Some weird exit cause. Just exit. */ | |
2200 | packet_disconnect("wait returned status %04x.", status); | |
2201 | } | |
2202 | ||
2203 | /* disconnect channel */ | |
2204 | debug("session_exit_message: release channel %d", s->chanid); | |
8cd0437d | 2205 | |
2206 | /* | |
2207 | * Adjust cleanup callback attachment to send close messages when | |
b4bbf172 | 2208 | * the channel gets EOF. The session will be then be closed |
8cd0437d | 2209 | * by session_close_by_channel when the childs close their fds. |
2210 | */ | |
2211 | channel_register_cleanup(c->self, session_close_by_channel, 1); | |
2212 | ||
9da5c3c9 | 2213 | /* |
2214 | * emulate a write failure with 'chan_write_failed', nobody will be | |
2215 | * interested in data we write. | |
2216 | * Note that we must not call 'chan_read_failed', since there could | |
2217 | * be some more data waiting in the pipe. | |
2218 | */ | |
0b242b12 | 2219 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
2220 | chan_write_failed(c); | |
e78a59f5 | 2221 | } |
2222 | ||
1853d1ef | 2223 | void |
86066315 | 2224 | session_close(Session *s) |
e78a59f5 | 2225 | { |
2ceb8101 | 2226 | u_int i; |
61a2c1da | 2227 | |
c457707e | 2228 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
2362db19 | 2229 | if (s->ttyfd != -1) |
86066315 | 2230 | session_pty_cleanup(s); |
e78a59f5 | 2231 | if (s->term) |
2232 | xfree(s->term); | |
2233 | if (s->display) | |
2234 | xfree(s->display); | |
d08341e6 | 2235 | if (s->x11_chanids) |
2236 | xfree(s->x11_chanids); | |
f9314d9a | 2237 | if (s->auth_display) |
2238 | xfree(s->auth_display); | |
e78a59f5 | 2239 | if (s->auth_data) |
2240 | xfree(s->auth_data); | |
2241 | if (s->auth_proto) | |
2242 | xfree(s->auth_proto); | |
2243 | s->used = 0; | |
61a2c1da | 2244 | for (i = 0; i < s->num_env; i++) { |
2245 | xfree(s->env[i].name); | |
2246 | xfree(s->env[i].val); | |
2247 | } | |
2248 | if (s->env != NULL) | |
2249 | xfree(s->env); | |
1d1ffb87 | 2250 | session_proctitle(s); |
e78a59f5 | 2251 | } |
2252 | ||
2253 | void | |
2254 | session_close_by_pid(pid_t pid, int status) | |
2255 | { | |
2256 | Session *s = session_by_pid(pid); | |
2257 | if (s == NULL) { | |
c457707e | 2258 | debug("session_close_by_pid: no session for pid %ld", |
2259 | (long)pid); | |
e78a59f5 | 2260 | return; |
2261 | } | |
2262 | if (s->chanid != -1) | |
2263 | session_exit_message(s, status); | |
8cd0437d | 2264 | if (s->ttyfd != -1) |
2265 | session_pty_cleanup(s); | |
4c721c3d | 2266 | s->pid = 0; |
e78a59f5 | 2267 | } |
2268 | ||
2269 | /* | |
2270 | * this is called when a channel dies before | |
2271 | * the session 'child' itself dies | |
2272 | */ | |
2273 | void | |
2274 | session_close_by_channel(int id, void *arg) | |
2275 | { | |
2276 | Session *s = session_by_channel(id); | |
8cd0437d | 2277 | u_int i; |
d08341e6 | 2278 | |
e78a59f5 | 2279 | if (s == NULL) { |
418e724c | 2280 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 2281 | return; |
2282 | } | |
c457707e | 2283 | debug("session_close_by_channel: channel %d child %ld", |
2284 | id, (long)s->pid); | |
d5f24f94 | 2285 | if (s->pid != 0) { |
418e724c | 2286 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 2287 | /* |
2288 | * delay detach of session, but release pty, since | |
2289 | * the fd's to the child are already closed | |
2290 | */ | |
2362db19 | 2291 | if (s->ttyfd != -1) |
efcc9957 | 2292 | session_pty_cleanup(s); |
418e724c | 2293 | return; |
e78a59f5 | 2294 | } |
418e724c | 2295 | /* detach by removing callback */ |
2296 | channel_cancel_cleanup(s->chanid); | |
8cd0437d | 2297 | |
2298 | /* Close any X11 listeners associated with this session */ | |
2299 | if (s->x11_chanids != NULL) { | |
2300 | for (i = 0; s->x11_chanids[i] != -1; i++) { | |
2301 | session_close_x11(s->x11_chanids[i]); | |
2302 | s->x11_chanids[i] = -1; | |
2303 | } | |
2304 | } | |
2305 | ||
418e724c | 2306 | s->chanid = -1; |
d5f24f94 | 2307 | session_close(s); |
2308 | } | |
2309 | ||
2310 | void | |
1853d1ef | 2311 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 2312 | { |
2313 | int i; | |
184eed6a | 2314 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 2315 | Session *s = &sessions[i]; |
1853d1ef | 2316 | if (s->used) { |
2317 | if (closefunc != NULL) | |
2318 | closefunc(s); | |
2319 | else | |
2320 | session_close(s); | |
2321 | } | |
d5f24f94 | 2322 | } |
e78a59f5 | 2323 | } |
2324 | ||
396c147e | 2325 | static char * |
1d1ffb87 | 2326 | session_tty_list(void) |
2327 | { | |
2328 | static char buf[1024]; | |
2329 | int i; | |
d0104542 | 2330 | char *cp; |
2331 | ||
1d1ffb87 | 2332 | buf[0] = '\0'; |
184eed6a | 2333 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 2334 | Session *s = &sessions[i]; |
2335 | if (s->used && s->ttyfd != -1) { | |
b6453d99 | 2336 | |
d0104542 | 2337 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
2338 | cp = strrchr(s->tty, '/'); | |
2339 | cp = (cp == NULL) ? s->tty : cp + 1; | |
2340 | } else | |
2341 | cp = s->tty + 5; | |
b6453d99 | 2342 | |
1d1ffb87 | 2343 | if (buf[0] != '\0') |
2344 | strlcat(buf, ",", sizeof buf); | |
d0104542 | 2345 | strlcat(buf, cp, sizeof buf); |
1d1ffb87 | 2346 | } |
2347 | } | |
2348 | if (buf[0] == '\0') | |
2349 | strlcpy(buf, "notty", sizeof buf); | |
2350 | return buf; | |
2351 | } | |
2352 | ||
2353 | void | |
2354 | session_proctitle(Session *s) | |
2355 | { | |
2356 | if (s->pw == NULL) | |
2357 | error("no user for session %d", s->self); | |
2358 | else | |
2359 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
2360 | } | |
2361 | ||
8dcd9d5c | 2362 | int |
2363 | session_setup_x11fwd(Session *s) | |
2364 | { | |
8dcd9d5c | 2365 | struct stat st; |
c9d0ad9b | 2366 | char display[512], auth_display[512]; |
2367 | char hostname[MAXHOSTNAMELEN]; | |
d08341e6 | 2368 | u_int i; |
8dcd9d5c | 2369 | |
2370 | if (no_x11_forwarding_flag) { | |
2371 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
2372 | return 0; | |
2373 | } | |
2374 | if (!options.x11_forwarding) { | |
2375 | debug("X11 forwarding disabled in server configuration file."); | |
2376 | return 0; | |
2377 | } | |
2378 | if (!options.xauth_location || | |
2379 | (stat(options.xauth_location, &st) == -1)) { | |
2380 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
2381 | return 0; | |
2382 | } | |
ff027d84 | 2383 | if (options.use_login) { |
2384 | packet_send_debug("X11 forwarding disabled; " | |
2385 | "not compatible with UseLogin=yes."); | |
2386 | return 0; | |
2387 | } | |
b44de2b1 | 2388 | if (s->display != NULL) { |
8dcd9d5c | 2389 | debug("X11 display already set."); |
2390 | return 0; | |
2391 | } | |
57f228e8 | 2392 | if (x11_create_display_inet(options.x11_display_offset, |
2393 | options.x11_use_localhost, s->single_connection, | |
d08341e6 | 2394 | &s->display_number, &s->x11_chanids) == -1) { |
b44de2b1 | 2395 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 2396 | return 0; |
2397 | } | |
d08341e6 | 2398 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
2399 | channel_register_cleanup(s->x11_chanids[i], | |
8cd0437d | 2400 | session_close_single_x11, 0); |
d08341e6 | 2401 | } |
c9d0ad9b | 2402 | |
2403 | /* Set up a suitable value for the DISPLAY variable. */ | |
2404 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
2405 | fatal("gethostname: %.100s", strerror(errno)); | |
2406 | /* | |
2407 | * auth_display must be used as the displayname when the | |
2408 | * authorization entry is added with xauth(1). This will be | |
2409 | * different than the DISPLAY string for localhost displays. | |
2410 | */ | |
e6e573bd | 2411 | if (options.x11_use_localhost) { |
57f228e8 | 2412 | snprintf(display, sizeof display, "localhost:%u.%u", |
c9d0ad9b | 2413 | s->display_number, s->screen); |
57f228e8 | 2414 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
f9314d9a | 2415 | s->display_number, s->screen); |
c9d0ad9b | 2416 | s->display = xstrdup(display); |
f9314d9a | 2417 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 2418 | } else { |
2419 | #ifdef IPADDR_IN_DISPLAY | |
2420 | struct hostent *he; | |
2421 | struct in_addr my_addr; | |
2422 | ||
2423 | he = gethostbyname(hostname); | |
2424 | if (he == NULL) { | |
2425 | error("Can't get IP address for X11 DISPLAY."); | |
2426 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2427 | return 0; | |
2428 | } | |
2429 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
57f228e8 | 2430 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
c9d0ad9b | 2431 | s->display_number, s->screen); |
2432 | #else | |
57f228e8 | 2433 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
c9d0ad9b | 2434 | s->display_number, s->screen); |
2435 | #endif | |
2436 | s->display = xstrdup(display); | |
f9314d9a | 2437 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2438 | } |
2439 | ||
8dcd9d5c | 2440 | return 1; |
2441 | } | |
2442 | ||
396c147e | 2443 | static void |
59c97189 | 2444 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2445 | { |
57156994 | 2446 | server_loop2(authctxt); |
2362db19 | 2447 | } |
2448 | ||
2449 | void | |
2450 | do_cleanup(Authctxt *authctxt) | |
2451 | { | |
2452 | static int called = 0; | |
2453 | ||
2454 | debug("do_cleanup"); | |
2455 | ||
2456 | /* no cleanup if we're in the child for login shell */ | |
2457 | if (is_child) | |
2458 | return; | |
2459 | ||
2460 | /* avoid double cleanup */ | |
2461 | if (called) | |
2462 | return; | |
2463 | called = 1; | |
2464 | ||
2465 | if (authctxt == NULL) | |
2466 | return; | |
2467 | #ifdef KRB5 | |
2468 | if (options.kerberos_ticket_cleanup && | |
2469 | authctxt->krb5_ctx) | |
2470 | krb5_cleanup_proc(authctxt); | |
7364bd04 | 2471 | #endif |
2362db19 | 2472 | |
2473 | #ifdef GSSAPI | |
2474 | if (compat20 && options.gss_cleanup_creds) | |
2475 | ssh_gssapi_cleanup_creds(); | |
2476 | #endif | |
2477 | ||
c6630044 | 2478 | #ifdef USE_PAM |
2479 | if (options.use_pam) { | |
2480 | sshpam_cleanup(); | |
2481 | sshpam_thread_cleanup(); | |
2482 | } | |
2483 | #endif | |
2484 | ||
2362db19 | 2485 | /* remove agent socket */ |
2486 | auth_sock_cleanup_proc(authctxt->pw); | |
2487 | ||
2488 | /* | |
2489 | * Cleanup ptys/utmp only if privsep is disabled, | |
2490 | * or if running in monitor. | |
2491 | */ | |
2492 | if (!use_privsep || mm_is_monitor()) | |
2493 | session_destroy_all(session_pty_cleanup2); | |
e78a59f5 | 2494 | } |