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7368a6c8 | 1 | /* |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
bcbf86ec | 4 | * |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | * | |
e78a59f5 | 11 | * SSH2 support by Markus Friedl. |
a96070d4 | 12 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 13 | * |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions | |
16 | * are met: | |
17 | * 1. Redistributions of source code must retain the above copyright | |
18 | * notice, this list of conditions and the following disclaimer. | |
19 | * 2. Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
e78a59f5 | 33 | */ |
7368a6c8 | 34 | |
35 | #include "includes.h" | |
87f18810 | 36 | RCSID("$OpenBSD: session.c,v 1.141 2002/06/26 08:58:26 markus Exp $"); |
7368a6c8 | 37 | |
7368a6c8 | 38 | #include "ssh.h" |
42f11eb2 | 39 | #include "ssh1.h" |
40 | #include "ssh2.h" | |
41 | #include "xmalloc.h" | |
1729c161 | 42 | #include "sshpty.h" |
7368a6c8 | 43 | #include "packet.h" |
44 | #include "buffer.h" | |
7368a6c8 | 45 | #include "mpaux.h" |
7368a6c8 | 46 | #include "uidswap.h" |
47 | #include "compat.h" | |
a5efa1bb | 48 | #include "channels.h" |
e78a59f5 | 49 | #include "bufaux.h" |
e78a59f5 | 50 | #include "auth.h" |
38c295d6 | 51 | #include "auth-options.h" |
42f11eb2 | 52 | #include "pathnames.h" |
53 | #include "log.h" | |
54 | #include "servconf.h" | |
1729c161 | 55 | #include "sshlogin.h" |
42f11eb2 | 56 | #include "serverloop.h" |
57 | #include "canohost.h" | |
5ca51e19 | 58 | #include "session.h" |
1853d1ef | 59 | #include "monitor_wrap.h" |
e78a59f5 | 60 | |
3c62e7eb | 61 | #ifdef HAVE_CYGWIN |
62 | #include <windows.h> | |
63 | #include <sys/cygwin.h> | |
64 | #define is_winnt (GetVersion() < 0x80000000) | |
65 | #endif | |
66 | ||
7368a6c8 | 67 | /* func */ |
68 | ||
69 | Session *session_new(void); | |
9c328529 | 70 | void session_set_fds(Session *, int, int, int); |
1853d1ef | 71 | void session_pty_cleanup(void *); |
9c328529 | 72 | void session_proctitle(Session *); |
73 | int session_setup_x11fwd(Session *); | |
74 | void do_exec_pty(Session *, const char *); | |
75 | void do_exec_no_pty(Session *, const char *); | |
76 | void do_exec(Session *, const char *); | |
77 | void do_login(Session *, const char *); | |
8a9ac95d | 78 | #ifdef LOGIN_NEEDS_UTMPX |
79 | static void do_pre_login(Session *s); | |
80 | #endif | |
9c328529 | 81 | void do_child(Session *, const char *); |
f2c2fd71 | 82 | void do_motd(void); |
9c328529 | 83 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 84 | |
396c147e | 85 | static void do_authenticated1(Authctxt *); |
86 | static void do_authenticated2(Authctxt *); | |
9c328529 | 87 | |
396c147e | 88 | static int session_pty_req(Session *); |
bb5639fe | 89 | |
7368a6c8 | 90 | /* import */ |
91 | extern ServerOptions options; | |
92 | extern char *__progname; | |
93 | extern int log_stderr; | |
94 | extern int debug_flag; | |
1e3b8b07 | 95 | extern u_int utmp_len; |
089fbbd2 | 96 | extern int startup_pipe; |
e78e738a | 97 | extern void destroy_sensitive_data(void); |
089fbbd2 | 98 | |
b5e300c2 | 99 | /* original command from peer. */ |
c95add71 | 100 | const char *original_command = NULL; |
b5e300c2 | 101 | |
7368a6c8 | 102 | /* data */ |
103 | #define MAX_SESSIONS 10 | |
104 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 105 | |
c1ef8333 | 106 | #ifdef WITH_AIXAUTHENTICATE |
c1ef8333 | 107 | char *aixloginmsg; |
108 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 109 | |
2e73a022 | 110 | #ifdef HAVE_LOGIN_CAP |
1836f69f | 111 | login_cap_t *lc; |
2e73a022 | 112 | #endif |
113 | ||
149cdb60 | 114 | /* Name and directory of socket for authentication agent forwarding. */ |
115 | static char *auth_sock_name = NULL; | |
116 | static char *auth_sock_dir = NULL; | |
117 | ||
118 | /* removes the agent forwarding socket */ | |
119 | ||
120 | static void | |
121 | auth_sock_cleanup_proc(void *_pw) | |
122 | { | |
123 | struct passwd *pw = _pw; | |
124 | ||
125 | if (auth_sock_name != NULL) { | |
126 | temporarily_use_uid(pw); | |
127 | unlink(auth_sock_name); | |
128 | rmdir(auth_sock_dir); | |
129 | auth_sock_name = NULL; | |
130 | restore_uid(); | |
131 | } | |
132 | } | |
133 | ||
134 | static int | |
135 | auth_input_request_forwarding(struct passwd * pw) | |
136 | { | |
137 | Channel *nc; | |
138 | int sock; | |
139 | struct sockaddr_un sunaddr; | |
140 | ||
141 | if (auth_sock_name != NULL) { | |
142 | error("authentication forwarding requested twice."); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | /* Temporarily drop privileged uid for mkdir/bind. */ | |
147 | temporarily_use_uid(pw); | |
148 | ||
149 | /* Allocate a buffer for the socket name, and format the name. */ | |
150 | auth_sock_name = xmalloc(MAXPATHLEN); | |
151 | auth_sock_dir = xmalloc(MAXPATHLEN); | |
152 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); | |
153 | ||
154 | /* Create private directory for socket */ | |
155 | if (mkdtemp(auth_sock_dir) == NULL) { | |
156 | packet_send_debug("Agent forwarding disabled: " | |
157 | "mkdtemp() failed: %.100s", strerror(errno)); | |
158 | restore_uid(); | |
159 | xfree(auth_sock_name); | |
160 | xfree(auth_sock_dir); | |
161 | auth_sock_name = NULL; | |
162 | auth_sock_dir = NULL; | |
163 | return 0; | |
164 | } | |
c457707e | 165 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
166 | auth_sock_dir, (long) getpid()); | |
149cdb60 | 167 | |
168 | /* delete agent socket on fatal() */ | |
169 | fatal_add_cleanup(auth_sock_cleanup_proc, pw); | |
170 | ||
171 | /* Create the socket. */ | |
172 | sock = socket(AF_UNIX, SOCK_STREAM, 0); | |
173 | if (sock < 0) | |
174 | packet_disconnect("socket: %.100s", strerror(errno)); | |
175 | ||
176 | /* Bind it to the name. */ | |
177 | memset(&sunaddr, 0, sizeof(sunaddr)); | |
178 | sunaddr.sun_family = AF_UNIX; | |
179 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); | |
180 | ||
181 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) | |
182 | packet_disconnect("bind: %.100s", strerror(errno)); | |
183 | ||
184 | /* Restore the privileged uid. */ | |
185 | restore_uid(); | |
186 | ||
187 | /* Start listening on the socket. */ | |
188 | if (listen(sock, 5) < 0) | |
189 | packet_disconnect("listen: %.100s", strerror(errno)); | |
190 | ||
191 | /* Allocate a channel for the authentication agent socket. */ | |
192 | nc = channel_new("auth socket", | |
193 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, | |
194 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, | |
195 | 0, xstrdup("auth socket"), 1); | |
196 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); | |
197 | return 1; | |
198 | } | |
199 | ||
200 | ||
bb5639fe | 201 | void |
202 | do_authenticated(Authctxt *authctxt) | |
203 | { | |
204 | /* | |
205 | * Cancel the alarm we set to limit the time taken for | |
206 | * authentication. | |
207 | */ | |
208 | alarm(0); | |
209 | if (startup_pipe != -1) { | |
210 | close(startup_pipe); | |
211 | startup_pipe = -1; | |
212 | } | |
19e810f6 | 213 | #ifdef WITH_AIXAUTHENTICATE |
214 | /* We don't have a pty yet, so just label the line as "ssh" */ | |
215 | if (loginsuccess(authctxt->user, | |
983784a1 | 216 | get_canonical_hostname(options.verify_reverse_mapping), |
19e810f6 | 217 | "ssh", &aixloginmsg) < 0) |
218 | aixloginmsg = NULL; | |
219 | #endif /* WITH_AIXAUTHENTICATE */ | |
220 | ||
bb5639fe | 221 | /* setup the channel layer */ |
222 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
223 | channel_permit_all_opens(); | |
224 | ||
225 | if (compat20) | |
226 | do_authenticated2(authctxt); | |
227 | else | |
228 | do_authenticated1(authctxt); | |
e4f7282d | 229 | |
b44de2b1 | 230 | /* remove agent socket */ |
149cdb60 | 231 | if (auth_sock_name != NULL) |
f0f32b8e | 232 | auth_sock_cleanup_proc(authctxt->pw); |
ced49be2 | 233 | #ifdef KRB4 |
234 | if (options.kerberos_ticket_cleanup) | |
235 | krb4_cleanup_proc(authctxt); | |
236 | #endif | |
237 | #ifdef KRB5 | |
238 | if (options.kerberos_ticket_cleanup) | |
239 | krb5_cleanup_proc(authctxt); | |
240 | #endif | |
bb5639fe | 241 | } |
242 | ||
7368a6c8 | 243 | /* |
244 | * Prepares for an interactive session. This is called after the user has | |
245 | * been successfully authenticated. During this message exchange, pseudo | |
246 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
247 | * are requested, etc. | |
248 | */ | |
396c147e | 249 | static void |
bb5639fe | 250 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 251 | { |
252 | Session *s; | |
7368a6c8 | 253 | char *command; |
54a5250f | 254 | int success, type, screen_flag; |
7138ebd9 | 255 | int enable_compression_after_reply = 0; |
256 | u_int proto_len, data_len, dlen, compression_level = 0; | |
7368a6c8 | 257 | |
258 | s = session_new(); | |
ced49be2 | 259 | s->authctxt = authctxt; |
bb5639fe | 260 | s->pw = authctxt->pw; |
2e73a022 | 261 | |
7368a6c8 | 262 | /* |
263 | * We stay in this loop until the client requests to execute a shell | |
264 | * or a command. | |
265 | */ | |
266 | for (;;) { | |
bb5639fe | 267 | success = 0; |
7368a6c8 | 268 | |
269 | /* Get a packet from the client. */ | |
54a5250f | 270 | type = packet_read(); |
7368a6c8 | 271 | |
272 | /* Process the packet. */ | |
273 | switch (type) { | |
274 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 275 | compression_level = packet_get_int(); |
95500969 | 276 | packet_check_eom(); |
7368a6c8 | 277 | if (compression_level < 1 || compression_level > 9) { |
278 | packet_send_debug("Received illegal compression level %d.", | |
184eed6a | 279 | compression_level); |
7368a6c8 | 280 | break; |
281 | } | |
636f76ca | 282 | if (!options.compression) { |
283 | debug2("compression disabled"); | |
284 | break; | |
285 | } | |
7368a6c8 | 286 | /* Enable compression after we have responded with SUCCESS. */ |
287 | enable_compression_after_reply = 1; | |
288 | success = 1; | |
289 | break; | |
290 | ||
291 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 292 | success = session_pty_req(s); |
7368a6c8 | 293 | break; |
294 | ||
295 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 296 | s->auth_proto = packet_get_string(&proto_len); |
297 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 298 | |
2af09193 | 299 | screen_flag = packet_get_protocol_flags() & |
300 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
301 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
302 | ||
303 | if (packet_remaining() == 4) { | |
304 | if (!screen_flag) | |
305 | debug2("Buggy client: " | |
306 | "X11 screen flag missing"); | |
7368a6c8 | 307 | s->screen = packet_get_int(); |
c8b058b4 | 308 | } else { |
7368a6c8 | 309 | s->screen = 0; |
c8b058b4 | 310 | } |
95500969 | 311 | packet_check_eom(); |
8dcd9d5c | 312 | success = session_setup_x11fwd(s); |
313 | if (!success) { | |
314 | xfree(s->auth_proto); | |
315 | xfree(s->auth_data); | |
1500bcdd | 316 | s->auth_proto = NULL; |
317 | s->auth_data = NULL; | |
7368a6c8 | 318 | } |
7368a6c8 | 319 | break; |
7368a6c8 | 320 | |
321 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
322 | if (no_agent_forwarding_flag || compat13) { | |
323 | debug("Authentication agent forwarding not permitted for this authentication."); | |
324 | break; | |
325 | } | |
326 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 327 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 328 | break; |
329 | ||
330 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
331 | if (no_port_forwarding_flag) { | |
332 | debug("Port forwarding not permitted for this authentication."); | |
333 | break; | |
334 | } | |
33de75a3 | 335 | if (!options.allow_tcp_forwarding) { |
336 | debug("Port forwarding not permitted."); | |
337 | break; | |
338 | } | |
7368a6c8 | 339 | debug("Received TCP/IP port forwarding request."); |
bb5639fe | 340 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 341 | success = 1; |
342 | break; | |
343 | ||
344 | case SSH_CMSG_MAX_PACKET_SIZE: | |
345 | if (packet_set_maxsize(packet_get_int()) > 0) | |
346 | success = 1; | |
347 | break; | |
184eed6a | 348 | |
ced49be2 | 349 | #if defined(AFS) || defined(KRB5) |
350 | case SSH_CMSG_HAVE_KERBEROS_TGT: | |
351 | if (!options.kerberos_tgt_passing) { | |
352 | verbose("Kerberos TGT passing disabled."); | |
353 | } else { | |
354 | char *kdata = packet_get_string(&dlen); | |
95500969 | 355 | packet_check_eom(); |
184eed6a | 356 | |
ced49be2 | 357 | /* XXX - 0x41, see creds_to_radix version */ |
358 | if (kdata[0] != 0x41) { | |
359 | #ifdef KRB5 | |
360 | krb5_data tgt; | |
361 | tgt.data = kdata; | |
362 | tgt.length = dlen; | |
184eed6a | 363 | |
ced49be2 | 364 | if (auth_krb5_tgt(s->authctxt, &tgt)) |
365 | success = 1; | |
366 | else | |
367 | verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user); | |
368 | #endif /* KRB5 */ | |
369 | } else { | |
370 | #ifdef AFS | |
371 | if (auth_krb4_tgt(s->authctxt, kdata)) | |
372 | success = 1; | |
373 | else | |
374 | verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user); | |
375 | #endif /* AFS */ | |
376 | } | |
377 | xfree(kdata); | |
378 | } | |
379 | break; | |
380 | #endif /* AFS || KRB5 */ | |
184eed6a | 381 | |
ced49be2 | 382 | #ifdef AFS |
383 | case SSH_CMSG_HAVE_AFS_TOKEN: | |
384 | if (!options.afs_token_passing || !k_hasafs()) { | |
385 | verbose("AFS token passing disabled."); | |
386 | } else { | |
387 | /* Accept AFS token. */ | |
388 | char *token = packet_get_string(&dlen); | |
95500969 | 389 | packet_check_eom(); |
184eed6a | 390 | |
ced49be2 | 391 | if (auth_afs_token(s->authctxt, token)) |
392 | success = 1; | |
393 | else | |
394 | verbose("AFS token refused for %.100s", | |
395 | s->authctxt->user); | |
396 | xfree(token); | |
397 | } | |
398 | break; | |
399 | #endif /* AFS */ | |
7368a6c8 | 400 | |
401 | case SSH_CMSG_EXEC_SHELL: | |
402 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 403 | if (type == SSH_CMSG_EXEC_CMD) { |
404 | command = packet_get_string(&dlen); | |
405 | debug("Exec command '%.500s'", command); | |
c95add71 | 406 | do_exec(s, command); |
407 | xfree(command); | |
7368a6c8 | 408 | } else { |
c95add71 | 409 | do_exec(s, NULL); |
7368a6c8 | 410 | } |
95500969 | 411 | packet_check_eom(); |
fc2a1d28 | 412 | session_close(s); |
7368a6c8 | 413 | return; |
414 | ||
415 | default: | |
416 | /* | |
417 | * Any unknown messages in this phase are ignored, | |
418 | * and a failure message is returned. | |
419 | */ | |
420 | log("Unknown packet type received after authentication: %d", type); | |
421 | } | |
422 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
423 | packet_send(); | |
424 | packet_write_wait(); | |
425 | ||
426 | /* Enable compression now that we have replied if appropriate. */ | |
427 | if (enable_compression_after_reply) { | |
428 | enable_compression_after_reply = 0; | |
429 | packet_start_compression(compression_level); | |
430 | } | |
431 | } | |
432 | } | |
433 | ||
434 | /* | |
435 | * This is called to fork and execute a command when we have no tty. This | |
436 | * will call do_child from the child, and server_loop from the parent after | |
437 | * setting up file descriptors and such. | |
438 | */ | |
6ae2364d | 439 | void |
65068d16 | 440 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 441 | { |
c457707e | 442 | pid_t pid; |
7368a6c8 | 443 | |
444 | #ifdef USE_PIPES | |
445 | int pin[2], pout[2], perr[2]; | |
446 | /* Allocate pipes for communicating with the program. */ | |
447 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
448 | packet_disconnect("Could not create pipes: %.100s", | |
449 | strerror(errno)); | |
450 | #else /* USE_PIPES */ | |
451 | int inout[2], err[2]; | |
452 | /* Uses socket pairs to communicate with the program. */ | |
453 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
454 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
455 | packet_disconnect("Could not create socket pairs: %.100s", | |
456 | strerror(errno)); | |
457 | #endif /* USE_PIPES */ | |
458 | if (s == NULL) | |
459 | fatal("do_exec_no_pty: no session"); | |
460 | ||
1d1ffb87 | 461 | session_proctitle(s); |
7368a6c8 | 462 | |
b19d61d7 | 463 | #if defined(USE_PAM) |
78220944 | 464 | do_pam_session(s->pw->pw_name, NULL); |
9afbfcfa | 465 | do_pam_setcred(1); |
7eb73cc1 | 466 | if (is_pam_password_change_required()) |
467 | packet_disconnect("Password change required but no " | |
468 | "TTY available"); | |
266140a8 | 469 | #endif /* USE_PAM */ |
470 | ||
7368a6c8 | 471 | /* Fork the child. */ |
472 | if ((pid = fork()) == 0) { | |
473 | /* Child. Reinitialize the log since the pid has changed. */ | |
474 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
475 | ||
476 | /* | |
477 | * Create a new session and process group since the 4.4BSD | |
478 | * setlogin() affects the entire process group. | |
479 | */ | |
480 | if (setsid() < 0) | |
481 | error("setsid failed: %.100s", strerror(errno)); | |
482 | ||
483 | #ifdef USE_PIPES | |
484 | /* | |
485 | * Redirect stdin. We close the parent side of the socket | |
486 | * pair, and make the child side the standard input. | |
487 | */ | |
488 | close(pin[1]); | |
489 | if (dup2(pin[0], 0) < 0) | |
490 | perror("dup2 stdin"); | |
491 | close(pin[0]); | |
492 | ||
493 | /* Redirect stdout. */ | |
494 | close(pout[0]); | |
495 | if (dup2(pout[1], 1) < 0) | |
496 | perror("dup2 stdout"); | |
497 | close(pout[1]); | |
498 | ||
499 | /* Redirect stderr. */ | |
500 | close(perr[0]); | |
501 | if (dup2(perr[1], 2) < 0) | |
502 | perror("dup2 stderr"); | |
503 | close(perr[1]); | |
504 | #else /* USE_PIPES */ | |
505 | /* | |
506 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
507 | * use the same socket, as some programs (particularly rdist) | |
508 | * seem to depend on it. | |
509 | */ | |
510 | close(inout[1]); | |
511 | close(err[1]); | |
512 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
513 | perror("dup2 stdin"); | |
514 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
515 | perror("dup2 stdout"); | |
516 | if (dup2(err[0], 2) < 0) /* stderr */ | |
517 | perror("dup2 stderr"); | |
518 | #endif /* USE_PIPES */ | |
519 | ||
520 | /* Do processing for the child (exec command etc). */ | |
56b3e9ce | 521 | do_child(s, command); |
7368a6c8 | 522 | /* NOTREACHED */ |
523 | } | |
3c62e7eb | 524 | #ifdef HAVE_CYGWIN |
525 | if (is_winnt) | |
526 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
527 | #endif | |
7368a6c8 | 528 | if (pid < 0) |
529 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
530 | s->pid = pid; | |
b5c334cc | 531 | /* Set interactive/non-interactive mode. */ |
532 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 533 | #ifdef USE_PIPES |
534 | /* We are the parent. Close the child sides of the pipes. */ | |
535 | close(pin[0]); | |
536 | close(pout[1]); | |
537 | close(perr[1]); | |
538 | ||
e78a59f5 | 539 | if (compat20) { |
e5d7a405 | 540 | session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); |
e78a59f5 | 541 | } else { |
542 | /* Enter the interactive session. */ | |
543 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 544 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 545 | } |
7368a6c8 | 546 | #else /* USE_PIPES */ |
547 | /* We are the parent. Close the child sides of the socket pairs. */ | |
548 | close(inout[0]); | |
549 | close(err[0]); | |
550 | ||
551 | /* | |
552 | * Enter the interactive session. Note: server_loop must be able to | |
553 | * handle the case that fdin and fdout are the same. | |
554 | */ | |
e78a59f5 | 555 | if (compat20) { |
e5d7a405 | 556 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 557 | } else { |
558 | server_loop(pid, inout[1], inout[1], err[1]); | |
559 | /* server_loop has closed inout[1] and err[1]. */ | |
560 | } | |
7368a6c8 | 561 | #endif /* USE_PIPES */ |
562 | } | |
563 | ||
564 | /* | |
565 | * This is called to fork and execute a command when we have a tty. This | |
566 | * will call do_child from the child, and server_loop from the parent after | |
567 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
568 | * lastlog, and other such operations. | |
569 | */ | |
6ae2364d | 570 | void |
65068d16 | 571 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 572 | { |
7368a6c8 | 573 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 574 | pid_t pid; |
7368a6c8 | 575 | |
576 | if (s == NULL) | |
577 | fatal("do_exec_pty: no session"); | |
578 | ptyfd = s->ptyfd; | |
579 | ttyfd = s->ttyfd; | |
580 | ||
b19d61d7 | 581 | #if defined(USE_PAM) |
bb5639fe | 582 | do_pam_session(s->pw->pw_name, s->tty); |
9afbfcfa | 583 | do_pam_setcred(1); |
27cf96de | 584 | #endif |
266140a8 | 585 | |
7368a6c8 | 586 | /* Fork the child. */ |
587 | if ((pid = fork()) == 0) { | |
57156994 | 588 | |
c345cf9d | 589 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 590 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 591 | /* Close the master side of the pseudo tty. */ |
592 | close(ptyfd); | |
593 | ||
594 | /* Make the pseudo tty our controlling tty. */ | |
595 | pty_make_controlling_tty(&ttyfd, s->tty); | |
596 | ||
05fd093c | 597 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
598 | if (dup2(ttyfd, 0) < 0) | |
599 | error("dup2 stdin: %s", strerror(errno)); | |
600 | if (dup2(ttyfd, 1) < 0) | |
601 | error("dup2 stdout: %s", strerror(errno)); | |
602 | if (dup2(ttyfd, 2) < 0) | |
603 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 604 | |
605 | /* Close the extra descriptor for the pseudo tty. */ | |
606 | close(ttyfd); | |
607 | ||
c345cf9d | 608 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 609 | #ifndef HAVE_OSF_SIA |
a22aff1f | 610 | if (!(options.use_login && command == NULL)) |
611 | do_login(s, command); | |
7e2d5fa4 | 612 | # ifdef LOGIN_NEEDS_UTMPX |
613 | else | |
614 | do_pre_login(s); | |
615 | # endif | |
c96a4aaf | 616 | #endif |
7368a6c8 | 617 | |
7368a6c8 | 618 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 619 | do_child(s, command); |
7368a6c8 | 620 | /* NOTREACHED */ |
621 | } | |
3c62e7eb | 622 | #ifdef HAVE_CYGWIN |
623 | if (is_winnt) | |
624 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
625 | #endif | |
7368a6c8 | 626 | if (pid < 0) |
627 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
628 | s->pid = pid; | |
629 | ||
630 | /* Parent. Close the slave side of the pseudo tty. */ | |
631 | close(ttyfd); | |
632 | ||
633 | /* | |
634 | * Create another descriptor of the pty master side for use as the | |
635 | * standard input. We could use the original descriptor, but this | |
636 | * simplifies code in server_loop. The descriptor is bidirectional. | |
637 | */ | |
638 | fdout = dup(ptyfd); | |
639 | if (fdout < 0) | |
640 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
641 | ||
642 | /* we keep a reference to the pty master */ | |
643 | ptymaster = dup(ptyfd); | |
644 | if (ptymaster < 0) | |
645 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
646 | s->ptymaster = ptymaster; | |
647 | ||
648 | /* Enter interactive session. */ | |
b5c334cc | 649 | packet_set_interactive(1); |
e78a59f5 | 650 | if (compat20) { |
651 | session_set_fds(s, ptyfd, fdout, -1); | |
652 | } else { | |
653 | server_loop(pid, ptyfd, fdout, -1); | |
654 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 655 | } |
7368a6c8 | 656 | } |
657 | ||
7e2d5fa4 | 658 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 659 | static void |
7e2d5fa4 | 660 | do_pre_login(Session *s) |
661 | { | |
662 | socklen_t fromlen; | |
663 | struct sockaddr_storage from; | |
664 | pid_t pid = getpid(); | |
665 | ||
666 | /* | |
667 | * Get IP address of client. If the connection is not a socket, let | |
668 | * the address be 0.0.0.0. | |
669 | */ | |
670 | memset(&from, 0, sizeof(from)); | |
671 | if (packet_connection_is_on_socket()) { | |
672 | fromlen = sizeof(from); | |
673 | if (getpeername(packet_get_connection_in(), | |
184eed6a | 674 | (struct sockaddr *) & from, &fromlen) < 0) { |
7e2d5fa4 | 675 | debug("getpeername: %.100s", strerror(errno)); |
676 | fatal_cleanup(); | |
677 | } | |
678 | } | |
679 | ||
680 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
983784a1 | 681 | get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping), |
7e2d5fa4 | 682 | (struct sockaddr *)&from); |
683 | } | |
684 | #endif | |
685 | ||
dac6753b | 686 | /* |
687 | * This is called to fork and execute a command. If another command is | |
688 | * to be forced, execute that instead. | |
689 | */ | |
690 | void | |
691 | do_exec(Session *s, const char *command) | |
692 | { | |
693 | if (forced_command) { | |
694 | original_command = command; | |
695 | command = forced_command; | |
dac6753b | 696 | debug("Forced command '%.900s'", command); |
697 | } | |
698 | ||
699 | if (s->ttyfd != -1) | |
700 | do_exec_pty(s, command); | |
701 | else | |
702 | do_exec_no_pty(s, command); | |
703 | ||
c95add71 | 704 | original_command = NULL; |
dac6753b | 705 | } |
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 | char *time_string; |
c345cf9d | 713 | socklen_t fromlen; |
714 | struct sockaddr_storage from; | |
c345cf9d | 715 | struct passwd * pw = s->pw; |
716 | pid_t pid = getpid(); | |
717 | ||
718 | /* | |
719 | * Get IP address of client. If the connection is not a socket, let | |
720 | * the address be 0.0.0.0. | |
721 | */ | |
722 | memset(&from, 0, sizeof(from)); | |
723 | if (packet_connection_is_on_socket()) { | |
724 | fromlen = sizeof(from); | |
725 | if (getpeername(packet_get_connection_in(), | |
f7342052 | 726 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 727 | debug("getpeername: %.100s", strerror(errno)); |
728 | fatal_cleanup(); | |
729 | } | |
730 | } | |
731 | ||
732 | /* Record that there was a login on that tty from the remote host. */ | |
49a34e84 | 733 | if (!use_privsep) |
734 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
735 | get_remote_name_or_ip(utmp_len, | |
736 | options.verify_reverse_mapping), | |
737 | (struct sockaddr *)&from); | |
c345cf9d | 738 | |
2919e060 | 739 | #ifdef USE_PAM |
740 | /* | |
741 | * If password change is needed, do it now. | |
742 | * This needs to occur before the ~/.hushlogin check. | |
743 | */ | |
e11aab29 | 744 | if (is_pam_password_change_required()) { |
2919e060 | 745 | print_pam_messages(); |
746 | do_pam_chauthtok(); | |
747 | } | |
748 | #endif | |
749 | ||
f2c2fd71 | 750 | if (check_quietlogin(s, command)) |
c345cf9d | 751 | return; |
752 | ||
753 | #ifdef USE_PAM | |
e11aab29 | 754 | if (!is_pam_password_change_required()) |
2919e060 | 755 | print_pam_messages(); |
c345cf9d | 756 | #endif /* USE_PAM */ |
757 | #ifdef WITH_AIXAUTHENTICATE | |
758 | if (aixloginmsg && *aixloginmsg) | |
759 | printf("%s\n", aixloginmsg); | |
760 | #endif /* WITH_AIXAUTHENTICATE */ | |
761 | ||
ffbf7323 | 762 | if (options.print_lastlog && s->last_login_time != 0) { |
763 | time_string = ctime(&s->last_login_time); | |
c345cf9d | 764 | if (strchr(time_string, '\n')) |
765 | *strchr(time_string, '\n') = 0; | |
ffbf7323 | 766 | if (strcmp(s->hostname, "") == 0) |
c345cf9d | 767 | printf("Last login: %s\r\n", time_string); |
768 | else | |
ffbf7323 | 769 | printf("Last login: %s from %s\r\n", time_string, |
770 | s->hostname); | |
c345cf9d | 771 | } |
f2c2fd71 | 772 | |
773 | do_motd(); | |
774 | } | |
775 | ||
776 | /* | |
777 | * Display the message of the day. | |
778 | */ | |
779 | void | |
780 | do_motd(void) | |
781 | { | |
782 | FILE *f; | |
783 | char buf[256]; | |
784 | ||
c345cf9d | 785 | if (options.print_motd) { |
2e73a022 | 786 | #ifdef HAVE_LOGIN_CAP |
787 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
788 | "/etc/motd"), "r"); | |
789 | #else | |
c345cf9d | 790 | f = fopen("/etc/motd", "r"); |
2e73a022 | 791 | #endif |
c345cf9d | 792 | if (f) { |
793 | while (fgets(buf, sizeof(buf), f)) | |
794 | fputs(buf, stdout); | |
795 | fclose(f); | |
796 | } | |
797 | } | |
798 | } | |
799 | ||
9c328529 | 800 | |
801 | /* | |
802 | * Check for quiet login, either .hushlogin or command given. | |
803 | */ | |
804 | int | |
805 | check_quietlogin(Session *s, const char *command) | |
806 | { | |
807 | char buf[256]; | |
808 | struct passwd *pw = s->pw; | |
809 | struct stat st; | |
810 | ||
811 | /* Return 1 if .hushlogin exists or a command given. */ | |
812 | if (command != NULL) | |
813 | return 1; | |
814 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
815 | #ifdef HAVE_LOGIN_CAP | |
816 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
817 | return 1; | |
818 | #else | |
819 | if (stat(buf, &st) >= 0) | |
820 | return 1; | |
821 | #endif | |
822 | return 0; | |
823 | } | |
824 | ||
7368a6c8 | 825 | /* |
826 | * Sets the value of the given variable in the environment. If the variable | |
827 | * already exists, its value is overriden. | |
828 | */ | |
396c147e | 829 | static void |
1e3b8b07 | 830 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
184eed6a | 831 | const char *value) |
7368a6c8 | 832 | { |
1e3b8b07 | 833 | u_int i, namelen; |
7368a6c8 | 834 | char **env; |
835 | ||
836 | /* | |
837 | * Find the slot where the value should be stored. If the variable | |
838 | * already exists, we reuse the slot; otherwise we append a new slot | |
839 | * at the end of the array, expanding if necessary. | |
840 | */ | |
841 | env = *envp; | |
842 | namelen = strlen(name); | |
843 | for (i = 0; env[i]; i++) | |
844 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
845 | break; | |
846 | if (env[i]) { | |
847 | /* Reuse the slot. */ | |
848 | xfree(env[i]); | |
849 | } else { | |
850 | /* New variable. Expand if necessary. */ | |
851 | if (i >= (*envsizep) - 1) { | |
87f18810 | 852 | if (*envsizep >= 1000) |
853 | fatal("child_set_env: too many env vars," | |
854 | " skipping: %.100s", name); | |
7368a6c8 | 855 | (*envsizep) += 50; |
856 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
857 | } | |
858 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
859 | env[i + 1] = NULL; | |
860 | } | |
861 | ||
862 | /* Allocate space and format the variable in the appropriate slot. */ | |
863 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
864 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
865 | } | |
866 | ||
867 | /* | |
868 | * Reads environment variables from the given file and adds/overrides them | |
869 | * into the environment. If the file does not exist, this does nothing. | |
870 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
871 | * and assignments of the form name=value. No other forms are allowed. | |
872 | */ | |
396c147e | 873 | static void |
1e3b8b07 | 874 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 875 | const char *filename) |
7368a6c8 | 876 | { |
877 | FILE *f; | |
878 | char buf[4096]; | |
879 | char *cp, *value; | |
880 | ||
881 | f = fopen(filename, "r"); | |
882 | if (!f) | |
883 | return; | |
884 | ||
885 | while (fgets(buf, sizeof(buf), f)) { | |
886 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
887 | ; | |
888 | if (!*cp || *cp == '#' || *cp == '\n') | |
889 | continue; | |
890 | if (strchr(cp, '\n')) | |
891 | *strchr(cp, '\n') = '\0'; | |
892 | value = strchr(cp, '='); | |
893 | if (value == NULL) { | |
894 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
895 | continue; | |
896 | } | |
71276795 | 897 | /* |
898 | * Replace the equals sign by nul, and advance value to | |
899 | * the value string. | |
900 | */ | |
7368a6c8 | 901 | *value = '\0'; |
902 | value++; | |
903 | child_set_env(env, envsize, cp, value); | |
904 | } | |
905 | fclose(f); | |
906 | } | |
907 | ||
760b35a6 | 908 | void copy_environment(char **source, char ***env, u_int *envsize) |
7368a6c8 | 909 | { |
760b35a6 | 910 | char *var_name, *var_val; |
7368a6c8 | 911 | int i; |
912 | ||
760b35a6 | 913 | if (source == NULL) |
7368a6c8 | 914 | return; |
2b87da3b | 915 | |
760b35a6 | 916 | for(i = 0; source[i] != NULL; i++) { |
917 | var_name = xstrdup(source[i]); | |
918 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
919 | xfree(var_name); | |
7368a6c8 | 920 | continue; |
7368a6c8 | 921 | } |
760b35a6 | 922 | *var_val++ = '\0'; |
7368a6c8 | 923 | |
760b35a6 | 924 | debug3("Copy environment: %s=%s", var_name, var_val); |
925 | child_set_env(env, envsize, var_name, var_val); | |
926 | ||
927 | xfree(var_name); | |
22d89d24 | 928 | } |
929 | } | |
22d89d24 | 930 | |
f7342052 | 931 | static char ** |
932 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 933 | { |
7368a6c8 | 934 | char buf[256]; |
f7342052 | 935 | u_int i, envsize; |
7368a6c8 | 936 | char **env; |
f7342052 | 937 | struct passwd *pw = s->pw; |
7368a6c8 | 938 | |
7368a6c8 | 939 | /* Initialize the environment. */ |
940 | envsize = 100; | |
941 | env = xmalloc(envsize * sizeof(char *)); | |
942 | env[0] = NULL; | |
943 | ||
3c62e7eb | 944 | #ifdef HAVE_CYGWIN |
945 | /* | |
946 | * The Windows environment contains some setting which are | |
947 | * important for a running system. They must not be dropped. | |
948 | */ | |
760b35a6 | 949 | copy_environment(environ, &env, &envsize); |
3c62e7eb | 950 | #endif |
951 | ||
7368a6c8 | 952 | if (!options.use_login) { |
953 | /* Set basic environment. */ | |
954 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
955 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
956 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
2e73a022 | 957 | #ifdef HAVE_LOGIN_CAP |
958 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH); | |
959 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 960 | #else /* HAVE_LOGIN_CAP */ |
961 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 962 | /* |
963 | * There's no standard path on Windows. The path contains | |
964 | * important components pointing to the system directories, | |
965 | * needed for loading shared libraries. So the path better | |
966 | * remains intact here. | |
967 | */ | |
06617857 | 968 | # ifdef SUPERUSER_PATH |
969 | child_set_env(&env, &envsize, "PATH", | |
970 | s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH); | |
971 | # else | |
7368a6c8 | 972 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
06617857 | 973 | # endif /* SUPERUSER_PATH */ |
22d89d24 | 974 | # endif /* HAVE_CYGWIN */ |
975 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 976 | |
977 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
978 | _PATH_MAILDIR, pw->pw_name); | |
979 | child_set_env(&env, &envsize, "MAIL", buf); | |
980 | ||
981 | /* Normal systems set SHELL by default. */ | |
982 | child_set_env(&env, &envsize, "SHELL", shell); | |
983 | } | |
984 | if (getenv("TZ")) | |
985 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
986 | ||
987 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 988 | if (!options.use_login) { |
989 | while (custom_environment) { | |
990 | struct envstring *ce = custom_environment; | |
991 | char *s = ce->s; | |
f7342052 | 992 | |
2548961d | 993 | for (i = 0; s[i] != '=' && s[i]; i++) |
994 | ; | |
995 | if (s[i] == '=') { | |
996 | s[i] = 0; | |
997 | child_set_env(&env, &envsize, s, s + i + 1); | |
998 | } | |
999 | custom_environment = ce->next; | |
1000 | xfree(ce->s); | |
1001 | xfree(ce); | |
7368a6c8 | 1002 | } |
7368a6c8 | 1003 | } |
1004 | ||
1005 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
f7342052 | 1006 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1007 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1008 | ||
56b3e9ce | 1009 | if (s->ttyfd != -1) |
1010 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1011 | if (s->term) | |
1012 | child_set_env(&env, &envsize, "TERM", s->term); | |
1013 | if (s->display) | |
1014 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1015 | if (original_command) |
1016 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1017 | original_command); | |
7368a6c8 | 1018 | |
1019 | #ifdef _AIX | |
4936fcee | 1020 | { |
1021 | char *cp; | |
1022 | ||
1023 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1024 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1025 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1026 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1027 | read_environment_file(&env, &envsize, "/etc/environment"); | |
1028 | } | |
7368a6c8 | 1029 | #endif |
7368a6c8 | 1030 | #ifdef KRB4 |
ced49be2 | 1031 | if (s->authctxt->krb4_ticket_file) |
1032 | child_set_env(&env, &envsize, "KRBTKFILE", | |
1033 | s->authctxt->krb4_ticket_file); | |
1034 | #endif | |
1035 | #ifdef KRB5 | |
1036 | if (s->authctxt->krb5_ticket_file) | |
1037 | child_set_env(&env, &envsize, "KRB5CCNAME", | |
1038 | s->authctxt->krb5_ticket_file); | |
1039 | #endif | |
7368a6c8 | 1040 | #ifdef USE_PAM |
1041 | /* Pull in any environment variables that may have been set by PAM. */ | |
760b35a6 | 1042 | copy_environment(fetch_pam_environment(), &env, &envsize); |
7368a6c8 | 1043 | #endif /* USE_PAM */ |
1044 | ||
149cdb60 | 1045 | if (auth_sock_name != NULL) |
7368a6c8 | 1046 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1047 | auth_sock_name); |
7368a6c8 | 1048 | |
1049 | /* read $HOME/.ssh/environment. */ | |
1050 | if (!options.use_login) { | |
71276795 | 1051 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1052 | pw->pw_dir); | |
7368a6c8 | 1053 | read_environment_file(&env, &envsize, buf); |
1054 | } | |
1055 | if (debug_flag) { | |
1056 | /* dump the environment */ | |
1057 | fprintf(stderr, "Environment:\n"); | |
1058 | for (i = 0; env[i]; i++) | |
1059 | fprintf(stderr, " %.200s\n", env[i]); | |
1060 | } | |
f7342052 | 1061 | return env; |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1066 | * first in this order). | |
1067 | */ | |
1068 | static void | |
1069 | do_rc_files(Session *s, const char *shell) | |
1070 | { | |
1071 | FILE *f = NULL; | |
1072 | char cmd[1024]; | |
1073 | int do_xauth; | |
1074 | struct stat st; | |
1075 | ||
1076 | do_xauth = | |
1077 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1078 | ||
1079 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1080 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1081 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1082 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1083 | if (debug_flag) | |
1084 | fprintf(stderr, "Running %s\n", cmd); | |
1085 | f = popen(cmd, "w"); | |
1086 | if (f) { | |
1087 | if (do_xauth) | |
1088 | fprintf(f, "%s %s\n", s->auth_proto, | |
1089 | s->auth_data); | |
1090 | pclose(f); | |
1091 | } else | |
1092 | fprintf(stderr, "Could not run %s\n", | |
1093 | _PATH_SSH_USER_RC); | |
1094 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1095 | if (debug_flag) | |
1096 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1097 | _PATH_SSH_SYSTEM_RC); | |
1098 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1099 | if (f) { | |
1100 | if (do_xauth) | |
1101 | fprintf(f, "%s %s\n", s->auth_proto, | |
1102 | s->auth_data); | |
1103 | pclose(f); | |
1104 | } else | |
1105 | fprintf(stderr, "Could not run %s\n", | |
1106 | _PATH_SSH_SYSTEM_RC); | |
1107 | } else if (do_xauth && options.xauth_location != NULL) { | |
1108 | /* Add authority data to .Xauthority if appropriate. */ | |
1109 | if (debug_flag) { | |
1110 | fprintf(stderr, | |
375e20e7 | 1111 | "Running %.500s add " |
f7342052 | 1112 | "%.100s %.100s %.100s\n", |
1113 | options.xauth_location, s->auth_display, | |
1114 | s->auth_proto, s->auth_data); | |
1115 | } | |
1116 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1117 | options.xauth_location); | |
1118 | f = popen(cmd, "w"); | |
1119 | if (f) { | |
1120 | fprintf(f, "add %s %s %s\n", | |
1121 | s->auth_display, s->auth_proto, | |
1122 | s->auth_data); | |
1123 | pclose(f); | |
1124 | } else { | |
1125 | fprintf(stderr, "Could not run %s\n", | |
1126 | cmd); | |
1127 | } | |
1128 | } | |
1129 | } | |
1130 | ||
1131 | static void | |
1132 | do_nologin(struct passwd *pw) | |
1133 | { | |
1134 | FILE *f = NULL; | |
1135 | char buf[1024]; | |
1136 | ||
1137 | #ifdef HAVE_LOGIN_CAP | |
1138 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1139 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1140 | _PATH_NOLOGIN), "r"); | |
1141 | #else | |
1142 | if (pw->pw_uid) | |
1143 | f = fopen(_PATH_NOLOGIN, "r"); | |
1144 | #endif | |
1145 | if (f) { | |
1146 | /* /etc/nologin exists. Print its contents and exit. */ | |
1147 | while (fgets(buf, sizeof(buf), f)) | |
1148 | fputs(buf, stderr); | |
1149 | fclose(f); | |
1150 | exit(254); | |
1151 | } | |
1152 | } | |
1153 | ||
1154 | /* Set login name, uid, gid, and groups. */ | |
1853d1ef | 1155 | void |
f7342052 | 1156 | do_setusercontext(struct passwd *pw) |
1157 | { | |
e2bc41f9 | 1158 | char tty='\0'; |
1159 | ||
f7342052 | 1160 | #ifdef HAVE_CYGWIN |
8001948f | 1161 | if (is_winnt) { |
f7342052 | 1162 | #else /* HAVE_CYGWIN */ |
1163 | if (getuid() == 0 || geteuid() == 0) { | |
1164 | #endif /* HAVE_CYGWIN */ | |
8bbfc882 | 1165 | #ifdef HAVE_SETPCRED |
1166 | setpcred(pw->pw_name); | |
1167 | #endif /* HAVE_SETPCRED */ | |
f7342052 | 1168 | #ifdef HAVE_LOGIN_CAP |
8695f9f7 | 1169 | #ifdef __bsdi__ |
1170 | setpgid(0, 0); | |
1171 | #endif | |
f7342052 | 1172 | if (setusercontext(lc, pw, pw->pw_uid, |
1173 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1174 | perror("unable to set user context"); | |
1175 | exit(1); | |
1176 | } | |
1177 | #else | |
1178 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1179 | /* Sets login uid for accounting */ | |
1180 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1181 | error("setluid: %s", strerror(errno)); | |
1182 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1183 | ||
1184 | if (setlogin(pw->pw_name) < 0) | |
1185 | error("setlogin failed: %s", strerror(errno)); | |
1186 | if (setgid(pw->pw_gid) < 0) { | |
1187 | perror("setgid"); | |
1188 | exit(1); | |
1189 | } | |
1190 | /* Initialize the group list. */ | |
1191 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1192 | perror("initgroups"); | |
1193 | exit(1); | |
1194 | } | |
1195 | endgrent(); | |
1196 | # ifdef USE_PAM | |
1197 | /* | |
1198 | * PAM credentials may take the form of supplementary groups. | |
1199 | * These will have been wiped by the above initgroups() call. | |
1200 | * Reestablish them here. | |
1201 | */ | |
1202 | do_pam_setcred(0); | |
1203 | # endif /* USE_PAM */ | |
1204 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1205 | irix_setusercontext(pw); | |
1206 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
e2bc41f9 | 1207 | # ifdef _AIX |
1208 | /* XXX: Disable tty setting. Enabled if required later */ | |
1209 | aix_usrinfo(pw, &tty, -1); | |
1210 | # endif /* _AIX */ | |
f7342052 | 1211 | /* Permanently switch to the desired uid. */ |
1212 | permanently_set_uid(pw); | |
1213 | #endif | |
1214 | } | |
1215 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) | |
1216 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1217 | } | |
1218 | ||
51aeb639 | 1219 | static void |
1853d1ef | 1220 | launch_login(struct passwd *pw, const char *hostname) |
1221 | { | |
1222 | /* Launch login(1). */ | |
1223 | ||
85cc9118 | 1224 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1225 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1226 | (s->term ? s->term : "unknown"), |
1853d1ef | 1227 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1228 | #ifdef LOGIN_NO_ENDOPT |
1229 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1230 | #else | |
1853d1ef | 1231 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1232 | #endif |
1853d1ef | 1233 | |
1234 | /* Login couldn't be executed, die. */ | |
1235 | ||
1236 | perror("login"); | |
1237 | exit(1); | |
1238 | } | |
1239 | ||
f7342052 | 1240 | /* |
1241 | * Performs common processing for the child, such as setting up the | |
1242 | * environment, closing extra file descriptors, setting the user and group | |
1243 | * ids, and executing the command or shell. | |
1244 | */ | |
1245 | void | |
1246 | do_child(Session *s, const char *command) | |
1247 | { | |
1248 | extern char **environ; | |
1249 | char **env; | |
1250 | char *argv[10]; | |
1251 | const char *shell, *shell0, *hostname = NULL; | |
1252 | struct passwd *pw = s->pw; | |
1253 | u_int i; | |
1254 | ||
1255 | /* remove hostkey from the child's memory */ | |
1256 | destroy_sensitive_data(); | |
1257 | ||
1258 | /* login(1) is only called if we execute the login shell */ | |
1259 | if (options.use_login && command != NULL) | |
1260 | options.use_login = 0; | |
1261 | ||
1262 | /* | |
1263 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1264 | * switch, so we let login(1) to this for us. | |
1265 | */ | |
1266 | if (!options.use_login) { | |
1267 | #ifdef HAVE_OSF_SIA | |
1268 | session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty); | |
1269 | if (!check_quietlogin(s, command)) | |
1270 | do_motd(); | |
1271 | #else /* HAVE_OSF_SIA */ | |
1272 | do_nologin(pw); | |
1273 | do_setusercontext(pw); | |
1274 | #endif /* HAVE_OSF_SIA */ | |
1275 | } | |
1276 | ||
1277 | /* | |
1278 | * Get the shell from the password data. An empty shell field is | |
1279 | * legal, and means /bin/sh. | |
1280 | */ | |
1281 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
1282 | #ifdef HAVE_LOGIN_CAP | |
1283 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1284 | #endif | |
1285 | ||
1286 | env = do_setup_env(s, shell); | |
1287 | ||
2e73a022 | 1288 | /* we have to stash the hostname before we close our socket. */ |
1289 | if (options.use_login) | |
46e3af7f | 1290 | hostname = get_remote_name_or_ip(utmp_len, |
bf4c5edc | 1291 | options.verify_reverse_mapping); |
7368a6c8 | 1292 | /* |
1293 | * Close the connection descriptors; note that this is the child, and | |
1294 | * the server will still have the socket open, and it is important | |
1295 | * that we do not shutdown it. Note that the descriptors cannot be | |
1296 | * closed before building the environment, as we call | |
1297 | * get_remote_ipaddr there. | |
1298 | */ | |
1299 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1300 | close(packet_get_connection_in()); | |
1301 | else { | |
1302 | close(packet_get_connection_in()); | |
1303 | close(packet_get_connection_out()); | |
1304 | } | |
1305 | /* | |
1306 | * Close all descriptors related to channels. They will still remain | |
1307 | * open in the parent. | |
1308 | */ | |
1309 | /* XXX better use close-on-exec? -markus */ | |
1310 | channel_close_all(); | |
1311 | ||
1312 | /* | |
1313 | * Close any extra file descriptors. Note that there may still be | |
1314 | * descriptors left by system functions. They will be closed later. | |
1315 | */ | |
1316 | endpwent(); | |
1317 | ||
1318 | /* | |
1319 | * Close any extra open file descriptors so that we don\'t have them | |
1320 | * hanging around in clients. Note that we want to do this after | |
1321 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1322 | * descriptors open. | |
1323 | */ | |
1324 | for (i = 3; i < 64; i++) | |
1325 | close(i); | |
1326 | ||
7368a6c8 | 1327 | /* |
2a8a6488 | 1328 | * Must take new environment into use so that .ssh/rc, |
1329 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1330 | */ |
1331 | environ = env; | |
1332 | ||
6fcf67f7 | 1333 | #ifdef AFS |
1334 | /* Try to get AFS tokens for the local cell. */ | |
1335 | if (k_hasafs()) { | |
1336 | char cell[64]; | |
184eed6a | 1337 | |
6fcf67f7 | 1338 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) |
1339 | krb_afslog(cell, 0); | |
184eed6a | 1340 | |
6fcf67f7 | 1341 | krb_afslog(0, 0); |
1342 | } | |
1343 | #endif /* AFS */ | |
1344 | ||
dab89049 | 1345 | /* Change current directory to the user\'s home directory. */ |
1346 | if (chdir(pw->pw_dir) < 0) { | |
1347 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1348 | pw->pw_dir, strerror(errno)); | |
1349 | #ifdef HAVE_LOGIN_CAP | |
1350 | if (login_getcapbool(lc, "requirehome", 0)) | |
1351 | exit(1); | |
1352 | #endif | |
1353 | } | |
1354 | ||
f7342052 | 1355 | if (!options.use_login) |
1356 | do_rc_files(s, shell); | |
1d3c30db | 1357 | |
1358 | /* restore SIGPIPE for child */ | |
1359 | signal(SIGPIPE, SIG_DFL); | |
1360 | ||
f7342052 | 1361 | if (options.use_login) { |
1853d1ef | 1362 | launch_login(pw, hostname); |
1363 | /* NEVERREACHED */ | |
f7342052 | 1364 | } |
1365 | ||
1366 | /* Get the last component of the shell name. */ | |
1367 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1368 | shell0++; | |
1369 | else | |
1370 | shell0 = shell; | |
1371 | ||
7368a6c8 | 1372 | /* |
1373 | * If we have no command, execute the shell. In this case, the shell | |
1374 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1375 | * this is a login shell. | |
1376 | */ | |
1377 | if (!command) { | |
f7342052 | 1378 | char argv0[256]; |
7368a6c8 | 1379 | |
f7342052 | 1380 | /* Start the shell. Set initial character to '-'. */ |
1381 | argv0[0] = '-'; | |
7368a6c8 | 1382 | |
f7342052 | 1383 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1384 | >= sizeof(argv0) - 1) { | |
1385 | errno = EINVAL; | |
7368a6c8 | 1386 | perror(shell); |
1387 | exit(1); | |
f7342052 | 1388 | } |
7368a6c8 | 1389 | |
f7342052 | 1390 | /* Execute the shell. */ |
1391 | argv[0] = argv0; | |
1392 | argv[1] = NULL; | |
1393 | execve(shell, argv, env); | |
7368a6c8 | 1394 | |
f7342052 | 1395 | /* Executing the shell failed. */ |
1396 | perror(shell); | |
1397 | exit(1); | |
7368a6c8 | 1398 | } |
1399 | /* | |
1400 | * Execute the command using the user's shell. This uses the -c | |
1401 | * option to execute the command. | |
1402 | */ | |
f7342052 | 1403 | argv[0] = (char *) shell0; |
7368a6c8 | 1404 | argv[1] = "-c"; |
1405 | argv[2] = (char *) command; | |
1406 | argv[3] = NULL; | |
1407 | execve(shell, argv, env); | |
1408 | perror(shell); | |
1409 | exit(1); | |
1410 | } | |
1411 | ||
1412 | Session * | |
1413 | session_new(void) | |
1414 | { | |
1415 | int i; | |
1416 | static int did_init = 0; | |
1417 | if (!did_init) { | |
1418 | debug("session_new: init"); | |
184eed6a | 1419 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1420 | sessions[i].used = 0; |
7368a6c8 | 1421 | } |
1422 | did_init = 1; | |
1423 | } | |
184eed6a | 1424 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1425 | Session *s = &sessions[i]; |
1426 | if (! s->used) { | |
690d0d7f | 1427 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1428 | s->chanid = -1; |
1429 | s->ptyfd = -1; | |
1430 | s->ttyfd = -1; | |
7368a6c8 | 1431 | s->used = 1; |
86066315 | 1432 | s->self = i; |
02323c45 | 1433 | debug("session_new: session %d", i); |
7368a6c8 | 1434 | return s; |
1435 | } | |
1436 | } | |
1437 | return NULL; | |
1438 | } | |
1439 | ||
396c147e | 1440 | static void |
7368a6c8 | 1441 | session_dump(void) |
1442 | { | |
1443 | int i; | |
184eed6a | 1444 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1445 | Session *s = &sessions[i]; |
c457707e | 1446 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1447 | s->used, |
1448 | s->self, | |
1449 | s, | |
1450 | s->chanid, | |
c457707e | 1451 | (long)s->pid); |
7368a6c8 | 1452 | } |
1453 | } | |
1454 | ||
e78a59f5 | 1455 | int |
57156994 | 1456 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1457 | { |
1458 | Session *s = session_new(); | |
1459 | debug("session_open: channel %d", chanid); | |
1460 | if (s == NULL) { | |
1461 | error("no more sessions"); | |
1462 | return 0; | |
1463 | } | |
57156994 | 1464 | s->authctxt = authctxt; |
1465 | s->pw = authctxt->pw; | |
e78a59f5 | 1466 | if (s->pw == NULL) |
0725ea77 | 1467 | fatal("no user for session %d", s->self); |
0b242b12 | 1468 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1469 | s->chanid = chanid; | |
e78a59f5 | 1470 | return 1; |
1471 | } | |
1472 | ||
1853d1ef | 1473 | Session * |
1474 | session_by_tty(char *tty) | |
1475 | { | |
1476 | int i; | |
1477 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1478 | Session *s = &sessions[i]; | |
1479 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1480 | debug("session_by_tty: session %d tty %s", i, tty); | |
1481 | return s; | |
1482 | } | |
1483 | } | |
1484 | debug("session_by_tty: unknown tty %.100s", tty); | |
1485 | session_dump(); | |
1486 | return NULL; | |
1487 | } | |
1488 | ||
396c147e | 1489 | static Session * |
e78a59f5 | 1490 | session_by_channel(int id) |
1491 | { | |
1492 | int i; | |
184eed6a | 1493 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1494 | Session *s = &sessions[i]; |
1495 | if (s->used && s->chanid == id) { | |
1496 | debug("session_by_channel: session %d channel %d", i, id); | |
1497 | return s; | |
1498 | } | |
1499 | } | |
1500 | debug("session_by_channel: unknown channel %d", id); | |
1501 | session_dump(); | |
1502 | return NULL; | |
1503 | } | |
1504 | ||
396c147e | 1505 | static Session * |
e78a59f5 | 1506 | session_by_pid(pid_t pid) |
1507 | { | |
1508 | int i; | |
c457707e | 1509 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1510 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1511 | Session *s = &sessions[i]; |
1512 | if (s->used && s->pid == pid) | |
1513 | return s; | |
1514 | } | |
c457707e | 1515 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1516 | session_dump(); |
1517 | return NULL; | |
1518 | } | |
1519 | ||
396c147e | 1520 | static int |
e78a59f5 | 1521 | session_window_change_req(Session *s) |
1522 | { | |
1523 | s->col = packet_get_int(); | |
1524 | s->row = packet_get_int(); | |
1525 | s->xpixel = packet_get_int(); | |
1526 | s->ypixel = packet_get_int(); | |
95500969 | 1527 | packet_check_eom(); |
e78a59f5 | 1528 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1529 | return 1; | |
1530 | } | |
1531 | ||
396c147e | 1532 | static int |
e78a59f5 | 1533 | session_pty_req(Session *s) |
1534 | { | |
1e3b8b07 | 1535 | u_int len; |
30dcc918 | 1536 | int n_bytes; |
762715ce | 1537 | |
653d5f86 | 1538 | if (no_pty_flag) { |
1539 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1540 | return 0; |
653d5f86 | 1541 | } |
1542 | if (s->ttyfd != -1) { | |
1543 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1544 | return 0; |
653d5f86 | 1545 | } |
ffbf7323 | 1546 | /* Get the time and hostname when the user last logged in. */ |
1547 | if (options.print_lastlog) { | |
1548 | s->hostname[0] = '\0'; | |
1549 | s->last_login_time = get_last_login_time(s->pw->pw_uid, | |
1550 | s->pw->pw_name, s->hostname, sizeof(s->hostname)); | |
1551 | } | |
653d5f86 | 1552 | |
e78a59f5 | 1553 | s->term = packet_get_string(&len); |
653d5f86 | 1554 | |
1555 | if (compat20) { | |
1556 | s->col = packet_get_int(); | |
1557 | s->row = packet_get_int(); | |
1558 | } else { | |
1559 | s->row = packet_get_int(); | |
1560 | s->col = packet_get_int(); | |
1561 | } | |
e78a59f5 | 1562 | s->xpixel = packet_get_int(); |
1563 | s->ypixel = packet_get_int(); | |
1564 | ||
1565 | if (strcmp(s->term, "") == 0) { | |
1566 | xfree(s->term); | |
1567 | s->term = NULL; | |
1568 | } | |
653d5f86 | 1569 | |
e78a59f5 | 1570 | /* Allocate a pty and open it. */ |
653d5f86 | 1571 | debug("Allocating pty."); |
1853d1ef | 1572 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1573 | if (s->term) |
1574 | xfree(s->term); | |
e78a59f5 | 1575 | s->term = NULL; |
1576 | s->ptyfd = -1; | |
1577 | s->ttyfd = -1; | |
1578 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1579 | return 0; |
e78a59f5 | 1580 | } |
1581 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1582 | |
1583 | /* for SSH1 the tty modes length is not given */ | |
1584 | if (!compat20) | |
1585 | n_bytes = packet_remaining(); | |
1586 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1587 | ||
e78a59f5 | 1588 | /* |
1589 | * Add a cleanup function to clear the utmp entry and record logout | |
1590 | * time in case we call fatal() (e.g., the connection gets closed). | |
1591 | */ | |
86066315 | 1592 | fatal_add_cleanup(session_pty_cleanup, (void *)s); |
1853d1ef | 1593 | if (!use_privsep) |
1594 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1595 | |
1596 | /* Set window size from the packet. */ | |
e78a59f5 | 1597 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1598 | ||
95500969 | 1599 | packet_check_eom(); |
1d1ffb87 | 1600 | session_proctitle(s); |
e78a59f5 | 1601 | return 1; |
1602 | } | |
1603 | ||
396c147e | 1604 | static int |
0b242b12 | 1605 | session_subsystem_req(Session *s) |
1606 | { | |
01855277 | 1607 | struct stat st; |
1e3b8b07 | 1608 | u_int len; |
0b242b12 | 1609 | int success = 0; |
01855277 | 1610 | char *cmd, *subsys = packet_get_string(&len); |
38c295d6 | 1611 | int i; |
0b242b12 | 1612 | |
95500969 | 1613 | packet_check_eom(); |
8875ca97 | 1614 | log("subsystem request for %.100s", subsys); |
0b242b12 | 1615 | |
38c295d6 | 1616 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1617 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
1618 | cmd = options.subsystem_command[i]; | |
1619 | if (stat(cmd, &st) < 0) { | |
1620 | error("subsystem: cannot stat %s: %s", cmd, | |
1621 | strerror(errno)); | |
1622 | break; | |
1623 | } | |
1624 | debug("subsystem: exec() %s", cmd); | |
e5d7a405 | 1625 | s->is_subsystem = 1; |
01855277 | 1626 | do_exec(s, cmd); |
38c295d6 | 1627 | success = 1; |
24932ee9 | 1628 | break; |
38c295d6 | 1629 | } |
1630 | } | |
1631 | ||
1632 | if (!success) | |
8875ca97 | 1633 | log("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1634 | subsys); |
38c295d6 | 1635 | |
0b242b12 | 1636 | xfree(subsys); |
1637 | return success; | |
1638 | } | |
1639 | ||
396c147e | 1640 | static int |
0b242b12 | 1641 | session_x11_req(Session *s) |
1642 | { | |
8dcd9d5c | 1643 | int success; |
0b242b12 | 1644 | |
1645 | s->single_connection = packet_get_char(); | |
1646 | s->auth_proto = packet_get_string(NULL); | |
1647 | s->auth_data = packet_get_string(NULL); | |
1648 | s->screen = packet_get_int(); | |
95500969 | 1649 | packet_check_eom(); |
0b242b12 | 1650 | |
8dcd9d5c | 1651 | success = session_setup_x11fwd(s); |
1652 | if (!success) { | |
0b242b12 | 1653 | xfree(s->auth_proto); |
1654 | xfree(s->auth_data); | |
1500bcdd | 1655 | s->auth_proto = NULL; |
1656 | s->auth_data = NULL; | |
0b242b12 | 1657 | } |
8dcd9d5c | 1658 | return success; |
0b242b12 | 1659 | } |
1660 | ||
396c147e | 1661 | static int |
38c295d6 | 1662 | session_shell_req(Session *s) |
1663 | { | |
95500969 | 1664 | packet_check_eom(); |
dac6753b | 1665 | do_exec(s, NULL); |
38c295d6 | 1666 | return 1; |
1667 | } | |
1668 | ||
396c147e | 1669 | static int |
38c295d6 | 1670 | session_exec_req(Session *s) |
1671 | { | |
1e3b8b07 | 1672 | u_int len; |
38c295d6 | 1673 | char *command = packet_get_string(&len); |
95500969 | 1674 | packet_check_eom(); |
dac6753b | 1675 | do_exec(s, command); |
c95add71 | 1676 | xfree(command); |
38c295d6 | 1677 | return 1; |
1678 | } | |
1679 | ||
396c147e | 1680 | static int |
fa08c86b | 1681 | session_auth_agent_req(Session *s) |
1682 | { | |
1683 | static int called = 0; | |
95500969 | 1684 | packet_check_eom(); |
d343d900 | 1685 | if (no_agent_forwarding_flag) { |
1686 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1687 | return 0; | |
1688 | } | |
fa08c86b | 1689 | if (called) { |
1690 | return 0; | |
1691 | } else { | |
1692 | called = 1; | |
1693 | return auth_input_request_forwarding(s->pw); | |
1694 | } | |
1695 | } | |
1696 | ||
7899c98f | 1697 | int |
1698 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 1699 | { |
e78a59f5 | 1700 | int success = 0; |
e78a59f5 | 1701 | Session *s; |
e78a59f5 | 1702 | |
7899c98f | 1703 | if ((s = session_by_channel(c->self)) == NULL) { |
1704 | log("session_input_channel_req: no session %d req %.100s", | |
1705 | c->self, rtype); | |
1706 | return 0; | |
1707 | } | |
1708 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 1709 | |
1710 | /* | |
e5d7a405 | 1711 | * a session is in LARVAL state until a shell, a command |
1712 | * or a subsystem is executed | |
e78a59f5 | 1713 | */ |
1714 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1715 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1716 | success = session_shell_req(s); |
e78a59f5 | 1717 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1718 | success = session_exec_req(s); |
e78a59f5 | 1719 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1720 | success = session_pty_req(s); |
0b242b12 | 1721 | } else if (strcmp(rtype, "x11-req") == 0) { |
1722 | success = session_x11_req(s); | |
fa08c86b | 1723 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1724 | success = session_auth_agent_req(s); | |
0b242b12 | 1725 | } else if (strcmp(rtype, "subsystem") == 0) { |
1726 | success = session_subsystem_req(s); | |
e78a59f5 | 1727 | } |
1728 | } | |
1729 | if (strcmp(rtype, "window-change") == 0) { | |
1730 | success = session_window_change_req(s); | |
1731 | } | |
7899c98f | 1732 | return success; |
e78a59f5 | 1733 | } |
1734 | ||
1735 | void | |
1736 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1737 | { | |
1738 | if (!compat20) | |
1739 | fatal("session_set_fds: called for proto != 2.0"); | |
1740 | /* | |
1741 | * now that have a child and a pipe to the child, | |
1742 | * we can activate our channel and register the fd's | |
1743 | */ | |
1744 | if (s->chanid == -1) | |
1745 | fatal("no channel for session %d", s->self); | |
1746 | channel_set_fds(s->chanid, | |
1747 | fdout, fdin, fderr, | |
a22aff1f | 1748 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 1749 | 1, |
1750 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 1751 | } |
1752 | ||
86066315 | 1753 | /* |
1754 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
1755 | * (e.g., due to a dropped connection). | |
1756 | */ | |
1853d1ef | 1757 | void |
1758 | session_pty_cleanup2(void *session) | |
7368a6c8 | 1759 | { |
86066315 | 1760 | Session *s = session; |
1761 | ||
1762 | if (s == NULL) { | |
1763 | error("session_pty_cleanup: no session"); | |
1764 | return; | |
1765 | } | |
1766 | if (s->ttyfd == -1) | |
7368a6c8 | 1767 | return; |
1768 | ||
0725ea77 | 1769 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 1770 | |
7368a6c8 | 1771 | /* Record that the user has logged out. */ |
86066315 | 1772 | if (s->pid != 0) |
f3837bc6 | 1773 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 1774 | |
1775 | /* Release the pseudo-tty. */ | |
1853d1ef | 1776 | if (getuid() == 0) |
1777 | pty_release(s->tty); | |
7368a6c8 | 1778 | |
1779 | /* | |
1780 | * Close the server side of the socket pairs. We must do this after | |
1781 | * the pty cleanup, so that another process doesn't get this pty | |
1782 | * while we're still cleaning up. | |
1783 | */ | |
1784 | if (close(s->ptymaster) < 0) | |
1853d1ef | 1785 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 1786 | |
1787 | /* unlink pty from session */ | |
1788 | s->ttyfd = -1; | |
7368a6c8 | 1789 | } |
e78a59f5 | 1790 | |
1853d1ef | 1791 | void |
1792 | session_pty_cleanup(void *session) | |
1793 | { | |
1794 | PRIVSEP(session_pty_cleanup2(session)); | |
1795 | } | |
1796 | ||
396c147e | 1797 | static void |
e78a59f5 | 1798 | session_exit_message(Session *s, int status) |
1799 | { | |
1800 | Channel *c; | |
5a4ae906 | 1801 | |
1802 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 1803 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 1804 | s->self, s->chanid); |
c457707e | 1805 | debug("session_exit_message: session %d channel %d pid %ld", |
1806 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 1807 | |
1808 | if (WIFEXITED(status)) { | |
5a4ae906 | 1809 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 1810 | packet_put_int(WEXITSTATUS(status)); |
1811 | packet_send(); | |
1812 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 1813 | channel_request_start(s->chanid, "exit-signal", 0); |
e78a59f5 | 1814 | packet_put_int(WTERMSIG(status)); |
a64009ad | 1815 | #ifdef WCOREDUMP |
e78a59f5 | 1816 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1817 | #else /* WCOREDUMP */ |
1818 | packet_put_char(0); | |
1819 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1820 | packet_put_cstring(""); |
1821 | packet_put_cstring(""); | |
1822 | packet_send(); | |
1823 | } else { | |
1824 | /* Some weird exit cause. Just exit. */ | |
1825 | packet_disconnect("wait returned status %04x.", status); | |
1826 | } | |
1827 | ||
1828 | /* disconnect channel */ | |
1829 | debug("session_exit_message: release channel %d", s->chanid); | |
1830 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1831 | /* |
1832 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1833 | * interested in data we write. | |
1834 | * Note that we must not call 'chan_read_failed', since there could | |
1835 | * be some more data waiting in the pipe. | |
1836 | */ | |
0b242b12 | 1837 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1838 | chan_write_failed(c); | |
e78a59f5 | 1839 | s->chanid = -1; |
1840 | } | |
1841 | ||
1853d1ef | 1842 | void |
86066315 | 1843 | session_close(Session *s) |
e78a59f5 | 1844 | { |
c457707e | 1845 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
86066315 | 1846 | if (s->ttyfd != -1) { |
1847 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
1848 | session_pty_cleanup(s); | |
1849 | } | |
e78a59f5 | 1850 | if (s->term) |
1851 | xfree(s->term); | |
1852 | if (s->display) | |
1853 | xfree(s->display); | |
f9314d9a | 1854 | if (s->auth_display) |
1855 | xfree(s->auth_display); | |
e78a59f5 | 1856 | if (s->auth_data) |
1857 | xfree(s->auth_data); | |
1858 | if (s->auth_proto) | |
1859 | xfree(s->auth_proto); | |
1860 | s->used = 0; | |
1d1ffb87 | 1861 | session_proctitle(s); |
e78a59f5 | 1862 | } |
1863 | ||
1864 | void | |
1865 | session_close_by_pid(pid_t pid, int status) | |
1866 | { | |
1867 | Session *s = session_by_pid(pid); | |
1868 | if (s == NULL) { | |
c457707e | 1869 | debug("session_close_by_pid: no session for pid %ld", |
1870 | (long)pid); | |
e78a59f5 | 1871 | return; |
1872 | } | |
1873 | if (s->chanid != -1) | |
1874 | session_exit_message(s, status); | |
1875 | session_close(s); | |
1876 | } | |
1877 | ||
1878 | /* | |
1879 | * this is called when a channel dies before | |
1880 | * the session 'child' itself dies | |
1881 | */ | |
1882 | void | |
1883 | session_close_by_channel(int id, void *arg) | |
1884 | { | |
1885 | Session *s = session_by_channel(id); | |
1886 | if (s == NULL) { | |
418e724c | 1887 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 1888 | return; |
1889 | } | |
c457707e | 1890 | debug("session_close_by_channel: channel %d child %ld", |
1891 | id, (long)s->pid); | |
d5f24f94 | 1892 | if (s->pid != 0) { |
418e724c | 1893 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 1894 | /* |
1895 | * delay detach of session, but release pty, since | |
1896 | * the fd's to the child are already closed | |
1897 | */ | |
1898 | if (s->ttyfd != -1) { | |
1899 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
1900 | session_pty_cleanup(s); | |
1901 | } | |
418e724c | 1902 | return; |
e78a59f5 | 1903 | } |
418e724c | 1904 | /* detach by removing callback */ |
1905 | channel_cancel_cleanup(s->chanid); | |
1906 | s->chanid = -1; | |
d5f24f94 | 1907 | session_close(s); |
1908 | } | |
1909 | ||
1910 | void | |
1853d1ef | 1911 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 1912 | { |
1913 | int i; | |
184eed6a | 1914 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 1915 | Session *s = &sessions[i]; |
1853d1ef | 1916 | if (s->used) { |
1917 | if (closefunc != NULL) | |
1918 | closefunc(s); | |
1919 | else | |
1920 | session_close(s); | |
1921 | } | |
d5f24f94 | 1922 | } |
e78a59f5 | 1923 | } |
1924 | ||
396c147e | 1925 | static char * |
1d1ffb87 | 1926 | session_tty_list(void) |
1927 | { | |
1928 | static char buf[1024]; | |
1929 | int i; | |
1930 | buf[0] = '\0'; | |
184eed6a | 1931 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 1932 | Session *s = &sessions[i]; |
1933 | if (s->used && s->ttyfd != -1) { | |
1934 | if (buf[0] != '\0') | |
1935 | strlcat(buf, ",", sizeof buf); | |
1936 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1937 | } | |
1938 | } | |
1939 | if (buf[0] == '\0') | |
1940 | strlcpy(buf, "notty", sizeof buf); | |
1941 | return buf; | |
1942 | } | |
1943 | ||
1944 | void | |
1945 | session_proctitle(Session *s) | |
1946 | { | |
1947 | if (s->pw == NULL) | |
1948 | error("no user for session %d", s->self); | |
1949 | else | |
1950 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
1951 | } | |
1952 | ||
8dcd9d5c | 1953 | int |
1954 | session_setup_x11fwd(Session *s) | |
1955 | { | |
8dcd9d5c | 1956 | struct stat st; |
c9d0ad9b | 1957 | char display[512], auth_display[512]; |
1958 | char hostname[MAXHOSTNAMELEN]; | |
8dcd9d5c | 1959 | |
1960 | if (no_x11_forwarding_flag) { | |
1961 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
1962 | return 0; | |
1963 | } | |
1964 | if (!options.x11_forwarding) { | |
1965 | debug("X11 forwarding disabled in server configuration file."); | |
1966 | return 0; | |
1967 | } | |
1968 | if (!options.xauth_location || | |
1969 | (stat(options.xauth_location, &st) == -1)) { | |
1970 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
1971 | return 0; | |
1972 | } | |
ff027d84 | 1973 | if (options.use_login) { |
1974 | packet_send_debug("X11 forwarding disabled; " | |
1975 | "not compatible with UseLogin=yes."); | |
1976 | return 0; | |
1977 | } | |
b44de2b1 | 1978 | if (s->display != NULL) { |
8dcd9d5c | 1979 | debug("X11 display already set."); |
1980 | return 0; | |
1981 | } | |
57f228e8 | 1982 | if (x11_create_display_inet(options.x11_display_offset, |
1983 | options.x11_use_localhost, s->single_connection, | |
1984 | &s->display_number) == -1) { | |
b44de2b1 | 1985 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 1986 | return 0; |
1987 | } | |
c9d0ad9b | 1988 | |
1989 | /* Set up a suitable value for the DISPLAY variable. */ | |
1990 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
1991 | fatal("gethostname: %.100s", strerror(errno)); | |
1992 | /* | |
1993 | * auth_display must be used as the displayname when the | |
1994 | * authorization entry is added with xauth(1). This will be | |
1995 | * different than the DISPLAY string for localhost displays. | |
1996 | */ | |
e6e573bd | 1997 | if (options.x11_use_localhost) { |
57f228e8 | 1998 | snprintf(display, sizeof display, "localhost:%u.%u", |
c9d0ad9b | 1999 | s->display_number, s->screen); |
57f228e8 | 2000 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
f9314d9a | 2001 | s->display_number, s->screen); |
c9d0ad9b | 2002 | s->display = xstrdup(display); |
f9314d9a | 2003 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 2004 | } else { |
2005 | #ifdef IPADDR_IN_DISPLAY | |
2006 | struct hostent *he; | |
2007 | struct in_addr my_addr; | |
2008 | ||
2009 | he = gethostbyname(hostname); | |
2010 | if (he == NULL) { | |
2011 | error("Can't get IP address for X11 DISPLAY."); | |
2012 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2013 | return 0; | |
2014 | } | |
2015 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
57f228e8 | 2016 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
c9d0ad9b | 2017 | s->display_number, s->screen); |
2018 | #else | |
57f228e8 | 2019 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
c9d0ad9b | 2020 | s->display_number, s->screen); |
2021 | #endif | |
2022 | s->display = xstrdup(display); | |
f9314d9a | 2023 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2024 | } |
2025 | ||
8dcd9d5c | 2026 | return 1; |
2027 | } | |
2028 | ||
396c147e | 2029 | static void |
59c97189 | 2030 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2031 | { |
57156994 | 2032 | server_loop2(authctxt); |
e78a59f5 | 2033 | } |