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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" | |
636f76ca | 36 | RCSID("$OpenBSD: session.c,v 1.138 2002/06/20 23:05:55 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; |
bb5639fe | 255 | int compression_level = 0, enable_compression_after_reply = 0; |
1e3b8b07 | 256 | u_int proto_len, data_len, dlen; |
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) { | |
852 | (*envsizep) += 50; | |
853 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
854 | } | |
855 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
856 | env[i + 1] = NULL; | |
857 | } | |
858 | ||
859 | /* Allocate space and format the variable in the appropriate slot. */ | |
860 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
861 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
862 | } | |
863 | ||
864 | /* | |
865 | * Reads environment variables from the given file and adds/overrides them | |
866 | * into the environment. If the file does not exist, this does nothing. | |
867 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
868 | * and assignments of the form name=value. No other forms are allowed. | |
869 | */ | |
396c147e | 870 | static void |
1e3b8b07 | 871 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 872 | const char *filename) |
7368a6c8 | 873 | { |
874 | FILE *f; | |
875 | char buf[4096]; | |
876 | char *cp, *value; | |
877 | ||
878 | f = fopen(filename, "r"); | |
879 | if (!f) | |
880 | return; | |
881 | ||
882 | while (fgets(buf, sizeof(buf), f)) { | |
883 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
884 | ; | |
885 | if (!*cp || *cp == '#' || *cp == '\n') | |
886 | continue; | |
887 | if (strchr(cp, '\n')) | |
888 | *strchr(cp, '\n') = '\0'; | |
889 | value = strchr(cp, '='); | |
890 | if (value == NULL) { | |
891 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
892 | continue; | |
893 | } | |
71276795 | 894 | /* |
895 | * Replace the equals sign by nul, and advance value to | |
896 | * the value string. | |
897 | */ | |
7368a6c8 | 898 | *value = '\0'; |
899 | value++; | |
900 | child_set_env(env, envsize, cp, value); | |
901 | } | |
902 | fclose(f); | |
903 | } | |
904 | ||
760b35a6 | 905 | void copy_environment(char **source, char ***env, u_int *envsize) |
7368a6c8 | 906 | { |
760b35a6 | 907 | char *var_name, *var_val; |
7368a6c8 | 908 | int i; |
909 | ||
760b35a6 | 910 | if (source == NULL) |
7368a6c8 | 911 | return; |
2b87da3b | 912 | |
760b35a6 | 913 | for(i = 0; source[i] != NULL; i++) { |
914 | var_name = xstrdup(source[i]); | |
915 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
916 | xfree(var_name); | |
7368a6c8 | 917 | continue; |
7368a6c8 | 918 | } |
760b35a6 | 919 | *var_val++ = '\0'; |
7368a6c8 | 920 | |
760b35a6 | 921 | debug3("Copy environment: %s=%s", var_name, var_val); |
922 | child_set_env(env, envsize, var_name, var_val); | |
923 | ||
924 | xfree(var_name); | |
22d89d24 | 925 | } |
926 | } | |
22d89d24 | 927 | |
f7342052 | 928 | static char ** |
929 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 930 | { |
7368a6c8 | 931 | char buf[256]; |
f7342052 | 932 | u_int i, envsize; |
7368a6c8 | 933 | char **env; |
f7342052 | 934 | struct passwd *pw = s->pw; |
7368a6c8 | 935 | |
7368a6c8 | 936 | /* Initialize the environment. */ |
937 | envsize = 100; | |
938 | env = xmalloc(envsize * sizeof(char *)); | |
939 | env[0] = NULL; | |
940 | ||
3c62e7eb | 941 | #ifdef HAVE_CYGWIN |
942 | /* | |
943 | * The Windows environment contains some setting which are | |
944 | * important for a running system. They must not be dropped. | |
945 | */ | |
760b35a6 | 946 | copy_environment(environ, &env, &envsize); |
3c62e7eb | 947 | #endif |
948 | ||
7368a6c8 | 949 | if (!options.use_login) { |
950 | /* Set basic environment. */ | |
951 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
952 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
953 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
2e73a022 | 954 | #ifdef HAVE_LOGIN_CAP |
955 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH); | |
956 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 957 | #else /* HAVE_LOGIN_CAP */ |
958 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 959 | /* |
960 | * There's no standard path on Windows. The path contains | |
961 | * important components pointing to the system directories, | |
962 | * needed for loading shared libraries. So the path better | |
963 | * remains intact here. | |
964 | */ | |
06617857 | 965 | # ifdef SUPERUSER_PATH |
966 | child_set_env(&env, &envsize, "PATH", | |
967 | s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH); | |
968 | # else | |
7368a6c8 | 969 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
06617857 | 970 | # endif /* SUPERUSER_PATH */ |
22d89d24 | 971 | # endif /* HAVE_CYGWIN */ |
972 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 973 | |
974 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
975 | _PATH_MAILDIR, pw->pw_name); | |
976 | child_set_env(&env, &envsize, "MAIL", buf); | |
977 | ||
978 | /* Normal systems set SHELL by default. */ | |
979 | child_set_env(&env, &envsize, "SHELL", shell); | |
980 | } | |
981 | if (getenv("TZ")) | |
982 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
983 | ||
984 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 985 | if (!options.use_login) { |
986 | while (custom_environment) { | |
987 | struct envstring *ce = custom_environment; | |
988 | char *s = ce->s; | |
f7342052 | 989 | |
2548961d | 990 | for (i = 0; s[i] != '=' && s[i]; i++) |
991 | ; | |
992 | if (s[i] == '=') { | |
993 | s[i] = 0; | |
994 | child_set_env(&env, &envsize, s, s + i + 1); | |
995 | } | |
996 | custom_environment = ce->next; | |
997 | xfree(ce->s); | |
998 | xfree(ce); | |
7368a6c8 | 999 | } |
7368a6c8 | 1000 | } |
1001 | ||
1002 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
f7342052 | 1003 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 1004 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
1005 | ||
56b3e9ce | 1006 | if (s->ttyfd != -1) |
1007 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1008 | if (s->term) | |
1009 | child_set_env(&env, &envsize, "TERM", s->term); | |
1010 | if (s->display) | |
1011 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1012 | if (original_command) |
1013 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1014 | original_command); | |
7368a6c8 | 1015 | |
1016 | #ifdef _AIX | |
4936fcee | 1017 | { |
1018 | char *cp; | |
1019 | ||
1020 | if ((cp = getenv("AUTHSTATE")) != NULL) | |
1021 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1022 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1023 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1024 | read_environment_file(&env, &envsize, "/etc/environment"); | |
1025 | } | |
7368a6c8 | 1026 | #endif |
7368a6c8 | 1027 | #ifdef KRB4 |
ced49be2 | 1028 | if (s->authctxt->krb4_ticket_file) |
1029 | child_set_env(&env, &envsize, "KRBTKFILE", | |
1030 | s->authctxt->krb4_ticket_file); | |
1031 | #endif | |
1032 | #ifdef KRB5 | |
1033 | if (s->authctxt->krb5_ticket_file) | |
1034 | child_set_env(&env, &envsize, "KRB5CCNAME", | |
1035 | s->authctxt->krb5_ticket_file); | |
1036 | #endif | |
7368a6c8 | 1037 | #ifdef USE_PAM |
1038 | /* Pull in any environment variables that may have been set by PAM. */ | |
760b35a6 | 1039 | copy_environment(fetch_pam_environment(), &env, &envsize); |
7368a6c8 | 1040 | #endif /* USE_PAM */ |
1041 | ||
149cdb60 | 1042 | if (auth_sock_name != NULL) |
7368a6c8 | 1043 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
149cdb60 | 1044 | auth_sock_name); |
7368a6c8 | 1045 | |
1046 | /* read $HOME/.ssh/environment. */ | |
1047 | if (!options.use_login) { | |
71276795 | 1048 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1049 | pw->pw_dir); | |
7368a6c8 | 1050 | read_environment_file(&env, &envsize, buf); |
1051 | } | |
1052 | if (debug_flag) { | |
1053 | /* dump the environment */ | |
1054 | fprintf(stderr, "Environment:\n"); | |
1055 | for (i = 0; env[i]; i++) | |
1056 | fprintf(stderr, " %.200s\n", env[i]); | |
1057 | } | |
f7342052 | 1058 | return env; |
1059 | } | |
1060 | ||
1061 | /* | |
1062 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1063 | * first in this order). | |
1064 | */ | |
1065 | static void | |
1066 | do_rc_files(Session *s, const char *shell) | |
1067 | { | |
1068 | FILE *f = NULL; | |
1069 | char cmd[1024]; | |
1070 | int do_xauth; | |
1071 | struct stat st; | |
1072 | ||
1073 | do_xauth = | |
1074 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1075 | ||
1076 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1077 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1078 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1079 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1080 | if (debug_flag) | |
1081 | fprintf(stderr, "Running %s\n", cmd); | |
1082 | f = popen(cmd, "w"); | |
1083 | if (f) { | |
1084 | if (do_xauth) | |
1085 | fprintf(f, "%s %s\n", s->auth_proto, | |
1086 | s->auth_data); | |
1087 | pclose(f); | |
1088 | } else | |
1089 | fprintf(stderr, "Could not run %s\n", | |
1090 | _PATH_SSH_USER_RC); | |
1091 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1092 | if (debug_flag) | |
1093 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1094 | _PATH_SSH_SYSTEM_RC); | |
1095 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1096 | if (f) { | |
1097 | if (do_xauth) | |
1098 | fprintf(f, "%s %s\n", s->auth_proto, | |
1099 | s->auth_data); | |
1100 | pclose(f); | |
1101 | } else | |
1102 | fprintf(stderr, "Could not run %s\n", | |
1103 | _PATH_SSH_SYSTEM_RC); | |
1104 | } else if (do_xauth && options.xauth_location != NULL) { | |
1105 | /* Add authority data to .Xauthority if appropriate. */ | |
1106 | if (debug_flag) { | |
1107 | fprintf(stderr, | |
375e20e7 | 1108 | "Running %.500s add " |
f7342052 | 1109 | "%.100s %.100s %.100s\n", |
1110 | options.xauth_location, s->auth_display, | |
1111 | s->auth_proto, s->auth_data); | |
1112 | } | |
1113 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1114 | options.xauth_location); | |
1115 | f = popen(cmd, "w"); | |
1116 | if (f) { | |
1117 | fprintf(f, "add %s %s %s\n", | |
1118 | s->auth_display, s->auth_proto, | |
1119 | s->auth_data); | |
1120 | pclose(f); | |
1121 | } else { | |
1122 | fprintf(stderr, "Could not run %s\n", | |
1123 | cmd); | |
1124 | } | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | static void | |
1129 | do_nologin(struct passwd *pw) | |
1130 | { | |
1131 | FILE *f = NULL; | |
1132 | char buf[1024]; | |
1133 | ||
1134 | #ifdef HAVE_LOGIN_CAP | |
1135 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1136 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1137 | _PATH_NOLOGIN), "r"); | |
1138 | #else | |
1139 | if (pw->pw_uid) | |
1140 | f = fopen(_PATH_NOLOGIN, "r"); | |
1141 | #endif | |
1142 | if (f) { | |
1143 | /* /etc/nologin exists. Print its contents and exit. */ | |
1144 | while (fgets(buf, sizeof(buf), f)) | |
1145 | fputs(buf, stderr); | |
1146 | fclose(f); | |
1147 | exit(254); | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | /* Set login name, uid, gid, and groups. */ | |
1853d1ef | 1152 | void |
f7342052 | 1153 | do_setusercontext(struct passwd *pw) |
1154 | { | |
1155 | #ifdef HAVE_CYGWIN | |
8001948f | 1156 | if (is_winnt) { |
f7342052 | 1157 | #else /* HAVE_CYGWIN */ |
1158 | if (getuid() == 0 || geteuid() == 0) { | |
1159 | #endif /* HAVE_CYGWIN */ | |
8bbfc882 | 1160 | #ifdef HAVE_SETPCRED |
1161 | setpcred(pw->pw_name); | |
1162 | #endif /* HAVE_SETPCRED */ | |
f7342052 | 1163 | #ifdef HAVE_LOGIN_CAP |
1164 | if (setusercontext(lc, pw, pw->pw_uid, | |
1165 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1166 | perror("unable to set user context"); | |
1167 | exit(1); | |
1168 | } | |
1169 | #else | |
1170 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1171 | /* Sets login uid for accounting */ | |
1172 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1173 | error("setluid: %s", strerror(errno)); | |
1174 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1175 | ||
1176 | if (setlogin(pw->pw_name) < 0) | |
1177 | error("setlogin failed: %s", strerror(errno)); | |
1178 | if (setgid(pw->pw_gid) < 0) { | |
1179 | perror("setgid"); | |
1180 | exit(1); | |
1181 | } | |
1182 | /* Initialize the group list. */ | |
1183 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1184 | perror("initgroups"); | |
1185 | exit(1); | |
1186 | } | |
1187 | endgrent(); | |
1188 | # ifdef USE_PAM | |
1189 | /* | |
1190 | * PAM credentials may take the form of supplementary groups. | |
1191 | * These will have been wiped by the above initgroups() call. | |
1192 | * Reestablish them here. | |
1193 | */ | |
1194 | do_pam_setcred(0); | |
1195 | # endif /* USE_PAM */ | |
1196 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1197 | irix_setusercontext(pw); | |
1198 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
f7342052 | 1199 | /* Permanently switch to the desired uid. */ |
1200 | permanently_set_uid(pw); | |
1201 | #endif | |
1202 | } | |
1203 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) | |
1204 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1205 | } | |
1206 | ||
51aeb639 | 1207 | static void |
1853d1ef | 1208 | launch_login(struct passwd *pw, const char *hostname) |
1209 | { | |
1210 | /* Launch login(1). */ | |
1211 | ||
85cc9118 | 1212 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
1178e8db | 1213 | #ifdef xxxLOGIN_NEEDS_TERM |
875ec275 | 1214 | (s->term ? s->term : "unknown"), |
1853d1ef | 1215 | #endif /* LOGIN_NEEDS_TERM */ |
a2572aa7 | 1216 | #ifdef LOGIN_NO_ENDOPT |
1217 | "-p", "-f", pw->pw_name, (char *)NULL); | |
1218 | #else | |
1853d1ef | 1219 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
a2572aa7 | 1220 | #endif |
1853d1ef | 1221 | |
1222 | /* Login couldn't be executed, die. */ | |
1223 | ||
1224 | perror("login"); | |
1225 | exit(1); | |
1226 | } | |
1227 | ||
f7342052 | 1228 | /* |
1229 | * Performs common processing for the child, such as setting up the | |
1230 | * environment, closing extra file descriptors, setting the user and group | |
1231 | * ids, and executing the command or shell. | |
1232 | */ | |
1233 | void | |
1234 | do_child(Session *s, const char *command) | |
1235 | { | |
1236 | extern char **environ; | |
1237 | char **env; | |
1238 | char *argv[10]; | |
1239 | const char *shell, *shell0, *hostname = NULL; | |
1240 | struct passwd *pw = s->pw; | |
1241 | u_int i; | |
1242 | ||
1243 | /* remove hostkey from the child's memory */ | |
1244 | destroy_sensitive_data(); | |
1245 | ||
1246 | /* login(1) is only called if we execute the login shell */ | |
1247 | if (options.use_login && command != NULL) | |
1248 | options.use_login = 0; | |
1249 | ||
1250 | /* | |
1251 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1252 | * switch, so we let login(1) to this for us. | |
1253 | */ | |
1254 | if (!options.use_login) { | |
1255 | #ifdef HAVE_OSF_SIA | |
1256 | session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty); | |
1257 | if (!check_quietlogin(s, command)) | |
1258 | do_motd(); | |
1259 | #else /* HAVE_OSF_SIA */ | |
1260 | do_nologin(pw); | |
da522265 | 1261 | # ifdef _AIX |
1262 | aix_usrinfo(pw, s->tty, s->ttyfd); | |
1263 | # endif /* _AIX */ | |
f7342052 | 1264 | do_setusercontext(pw); |
1265 | #endif /* HAVE_OSF_SIA */ | |
1266 | } | |
1267 | ||
1268 | /* | |
1269 | * Get the shell from the password data. An empty shell field is | |
1270 | * legal, and means /bin/sh. | |
1271 | */ | |
1272 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
1273 | #ifdef HAVE_LOGIN_CAP | |
1274 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1275 | #endif | |
1276 | ||
1277 | env = do_setup_env(s, shell); | |
1278 | ||
2e73a022 | 1279 | /* we have to stash the hostname before we close our socket. */ |
1280 | if (options.use_login) | |
46e3af7f | 1281 | hostname = get_remote_name_or_ip(utmp_len, |
bf4c5edc | 1282 | options.verify_reverse_mapping); |
7368a6c8 | 1283 | /* |
1284 | * Close the connection descriptors; note that this is the child, and | |
1285 | * the server will still have the socket open, and it is important | |
1286 | * that we do not shutdown it. Note that the descriptors cannot be | |
1287 | * closed before building the environment, as we call | |
1288 | * get_remote_ipaddr there. | |
1289 | */ | |
1290 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1291 | close(packet_get_connection_in()); | |
1292 | else { | |
1293 | close(packet_get_connection_in()); | |
1294 | close(packet_get_connection_out()); | |
1295 | } | |
1296 | /* | |
1297 | * Close all descriptors related to channels. They will still remain | |
1298 | * open in the parent. | |
1299 | */ | |
1300 | /* XXX better use close-on-exec? -markus */ | |
1301 | channel_close_all(); | |
1302 | ||
1303 | /* | |
1304 | * Close any extra file descriptors. Note that there may still be | |
1305 | * descriptors left by system functions. They will be closed later. | |
1306 | */ | |
1307 | endpwent(); | |
1308 | ||
1309 | /* | |
1310 | * Close any extra open file descriptors so that we don\'t have them | |
1311 | * hanging around in clients. Note that we want to do this after | |
1312 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1313 | * descriptors open. | |
1314 | */ | |
1315 | for (i = 3; i < 64; i++) | |
1316 | close(i); | |
1317 | ||
7368a6c8 | 1318 | /* |
2a8a6488 | 1319 | * Must take new environment into use so that .ssh/rc, |
1320 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1321 | */ |
1322 | environ = env; | |
1323 | ||
6fcf67f7 | 1324 | #ifdef AFS |
1325 | /* Try to get AFS tokens for the local cell. */ | |
1326 | if (k_hasafs()) { | |
1327 | char cell[64]; | |
184eed6a | 1328 | |
6fcf67f7 | 1329 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) |
1330 | krb_afslog(cell, 0); | |
184eed6a | 1331 | |
6fcf67f7 | 1332 | krb_afslog(0, 0); |
1333 | } | |
1334 | #endif /* AFS */ | |
1335 | ||
dab89049 | 1336 | /* Change current directory to the user\'s home directory. */ |
1337 | if (chdir(pw->pw_dir) < 0) { | |
1338 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1339 | pw->pw_dir, strerror(errno)); | |
1340 | #ifdef HAVE_LOGIN_CAP | |
1341 | if (login_getcapbool(lc, "requirehome", 0)) | |
1342 | exit(1); | |
1343 | #endif | |
1344 | } | |
1345 | ||
f7342052 | 1346 | if (!options.use_login) |
1347 | do_rc_files(s, shell); | |
1d3c30db | 1348 | |
1349 | /* restore SIGPIPE for child */ | |
1350 | signal(SIGPIPE, SIG_DFL); | |
1351 | ||
f7342052 | 1352 | if (options.use_login) { |
1853d1ef | 1353 | launch_login(pw, hostname); |
1354 | /* NEVERREACHED */ | |
f7342052 | 1355 | } |
1356 | ||
1357 | /* Get the last component of the shell name. */ | |
1358 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1359 | shell0++; | |
1360 | else | |
1361 | shell0 = shell; | |
1362 | ||
7368a6c8 | 1363 | /* |
1364 | * If we have no command, execute the shell. In this case, the shell | |
1365 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1366 | * this is a login shell. | |
1367 | */ | |
1368 | if (!command) { | |
f7342052 | 1369 | char argv0[256]; |
7368a6c8 | 1370 | |
f7342052 | 1371 | /* Start the shell. Set initial character to '-'. */ |
1372 | argv0[0] = '-'; | |
7368a6c8 | 1373 | |
f7342052 | 1374 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1375 | >= sizeof(argv0) - 1) { | |
1376 | errno = EINVAL; | |
7368a6c8 | 1377 | perror(shell); |
1378 | exit(1); | |
f7342052 | 1379 | } |
7368a6c8 | 1380 | |
f7342052 | 1381 | /* Execute the shell. */ |
1382 | argv[0] = argv0; | |
1383 | argv[1] = NULL; | |
1384 | execve(shell, argv, env); | |
7368a6c8 | 1385 | |
f7342052 | 1386 | /* Executing the shell failed. */ |
1387 | perror(shell); | |
1388 | exit(1); | |
7368a6c8 | 1389 | } |
1390 | /* | |
1391 | * Execute the command using the user's shell. This uses the -c | |
1392 | * option to execute the command. | |
1393 | */ | |
f7342052 | 1394 | argv[0] = (char *) shell0; |
7368a6c8 | 1395 | argv[1] = "-c"; |
1396 | argv[2] = (char *) command; | |
1397 | argv[3] = NULL; | |
1398 | execve(shell, argv, env); | |
1399 | perror(shell); | |
1400 | exit(1); | |
1401 | } | |
1402 | ||
1403 | Session * | |
1404 | session_new(void) | |
1405 | { | |
1406 | int i; | |
1407 | static int did_init = 0; | |
1408 | if (!did_init) { | |
1409 | debug("session_new: init"); | |
184eed6a | 1410 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1411 | sessions[i].used = 0; |
7368a6c8 | 1412 | } |
1413 | did_init = 1; | |
1414 | } | |
184eed6a | 1415 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1416 | Session *s = &sessions[i]; |
1417 | if (! s->used) { | |
690d0d7f | 1418 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1419 | s->chanid = -1; |
1420 | s->ptyfd = -1; | |
1421 | s->ttyfd = -1; | |
7368a6c8 | 1422 | s->used = 1; |
86066315 | 1423 | s->self = i; |
02323c45 | 1424 | debug("session_new: session %d", i); |
7368a6c8 | 1425 | return s; |
1426 | } | |
1427 | } | |
1428 | return NULL; | |
1429 | } | |
1430 | ||
396c147e | 1431 | static void |
7368a6c8 | 1432 | session_dump(void) |
1433 | { | |
1434 | int i; | |
184eed6a | 1435 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1436 | Session *s = &sessions[i]; |
c457707e | 1437 | debug("dump: used %d session %d %p channel %d pid %ld", |
7368a6c8 | 1438 | s->used, |
1439 | s->self, | |
1440 | s, | |
1441 | s->chanid, | |
c457707e | 1442 | (long)s->pid); |
7368a6c8 | 1443 | } |
1444 | } | |
1445 | ||
e78a59f5 | 1446 | int |
57156994 | 1447 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1448 | { |
1449 | Session *s = session_new(); | |
1450 | debug("session_open: channel %d", chanid); | |
1451 | if (s == NULL) { | |
1452 | error("no more sessions"); | |
1453 | return 0; | |
1454 | } | |
57156994 | 1455 | s->authctxt = authctxt; |
1456 | s->pw = authctxt->pw; | |
e78a59f5 | 1457 | if (s->pw == NULL) |
0725ea77 | 1458 | fatal("no user for session %d", s->self); |
0b242b12 | 1459 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1460 | s->chanid = chanid; | |
e78a59f5 | 1461 | return 1; |
1462 | } | |
1463 | ||
1853d1ef | 1464 | Session * |
1465 | session_by_tty(char *tty) | |
1466 | { | |
1467 | int i; | |
1468 | for (i = 0; i < MAX_SESSIONS; i++) { | |
1469 | Session *s = &sessions[i]; | |
1470 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { | |
1471 | debug("session_by_tty: session %d tty %s", i, tty); | |
1472 | return s; | |
1473 | } | |
1474 | } | |
1475 | debug("session_by_tty: unknown tty %.100s", tty); | |
1476 | session_dump(); | |
1477 | return NULL; | |
1478 | } | |
1479 | ||
396c147e | 1480 | static Session * |
e78a59f5 | 1481 | session_by_channel(int id) |
1482 | { | |
1483 | int i; | |
184eed6a | 1484 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1485 | Session *s = &sessions[i]; |
1486 | if (s->used && s->chanid == id) { | |
1487 | debug("session_by_channel: session %d channel %d", i, id); | |
1488 | return s; | |
1489 | } | |
1490 | } | |
1491 | debug("session_by_channel: unknown channel %d", id); | |
1492 | session_dump(); | |
1493 | return NULL; | |
1494 | } | |
1495 | ||
396c147e | 1496 | static Session * |
e78a59f5 | 1497 | session_by_pid(pid_t pid) |
1498 | { | |
1499 | int i; | |
c457707e | 1500 | debug("session_by_pid: pid %ld", (long)pid); |
184eed6a | 1501 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1502 | Session *s = &sessions[i]; |
1503 | if (s->used && s->pid == pid) | |
1504 | return s; | |
1505 | } | |
c457707e | 1506 | error("session_by_pid: unknown pid %ld", (long)pid); |
e78a59f5 | 1507 | session_dump(); |
1508 | return NULL; | |
1509 | } | |
1510 | ||
396c147e | 1511 | static int |
e78a59f5 | 1512 | session_window_change_req(Session *s) |
1513 | { | |
1514 | s->col = packet_get_int(); | |
1515 | s->row = packet_get_int(); | |
1516 | s->xpixel = packet_get_int(); | |
1517 | s->ypixel = packet_get_int(); | |
95500969 | 1518 | packet_check_eom(); |
e78a59f5 | 1519 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1520 | return 1; | |
1521 | } | |
1522 | ||
396c147e | 1523 | static int |
e78a59f5 | 1524 | session_pty_req(Session *s) |
1525 | { | |
1e3b8b07 | 1526 | u_int len; |
30dcc918 | 1527 | int n_bytes; |
762715ce | 1528 | |
653d5f86 | 1529 | if (no_pty_flag) { |
1530 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1531 | return 0; |
653d5f86 | 1532 | } |
1533 | if (s->ttyfd != -1) { | |
1534 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1535 | return 0; |
653d5f86 | 1536 | } |
ffbf7323 | 1537 | /* Get the time and hostname when the user last logged in. */ |
1538 | if (options.print_lastlog) { | |
1539 | s->hostname[0] = '\0'; | |
1540 | s->last_login_time = get_last_login_time(s->pw->pw_uid, | |
1541 | s->pw->pw_name, s->hostname, sizeof(s->hostname)); | |
1542 | } | |
653d5f86 | 1543 | |
e78a59f5 | 1544 | s->term = packet_get_string(&len); |
653d5f86 | 1545 | |
1546 | if (compat20) { | |
1547 | s->col = packet_get_int(); | |
1548 | s->row = packet_get_int(); | |
1549 | } else { | |
1550 | s->row = packet_get_int(); | |
1551 | s->col = packet_get_int(); | |
1552 | } | |
e78a59f5 | 1553 | s->xpixel = packet_get_int(); |
1554 | s->ypixel = packet_get_int(); | |
1555 | ||
1556 | if (strcmp(s->term, "") == 0) { | |
1557 | xfree(s->term); | |
1558 | s->term = NULL; | |
1559 | } | |
653d5f86 | 1560 | |
e78a59f5 | 1561 | /* Allocate a pty and open it. */ |
653d5f86 | 1562 | debug("Allocating pty."); |
1853d1ef | 1563 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
653d5f86 | 1564 | if (s->term) |
1565 | xfree(s->term); | |
e78a59f5 | 1566 | s->term = NULL; |
1567 | s->ptyfd = -1; | |
1568 | s->ttyfd = -1; | |
1569 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1570 | return 0; |
e78a59f5 | 1571 | } |
1572 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1573 | |
1574 | /* for SSH1 the tty modes length is not given */ | |
1575 | if (!compat20) | |
1576 | n_bytes = packet_remaining(); | |
1577 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1578 | ||
e78a59f5 | 1579 | /* |
1580 | * Add a cleanup function to clear the utmp entry and record logout | |
1581 | * time in case we call fatal() (e.g., the connection gets closed). | |
1582 | */ | |
86066315 | 1583 | fatal_add_cleanup(session_pty_cleanup, (void *)s); |
1853d1ef | 1584 | if (!use_privsep) |
1585 | pty_setowner(s->pw, s->tty); | |
653d5f86 | 1586 | |
1587 | /* Set window size from the packet. */ | |
e78a59f5 | 1588 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1589 | ||
95500969 | 1590 | packet_check_eom(); |
1d1ffb87 | 1591 | session_proctitle(s); |
e78a59f5 | 1592 | return 1; |
1593 | } | |
1594 | ||
396c147e | 1595 | static int |
0b242b12 | 1596 | session_subsystem_req(Session *s) |
1597 | { | |
01855277 | 1598 | struct stat st; |
1e3b8b07 | 1599 | u_int len; |
0b242b12 | 1600 | int success = 0; |
01855277 | 1601 | char *cmd, *subsys = packet_get_string(&len); |
38c295d6 | 1602 | int i; |
0b242b12 | 1603 | |
95500969 | 1604 | packet_check_eom(); |
8875ca97 | 1605 | log("subsystem request for %.100s", subsys); |
0b242b12 | 1606 | |
38c295d6 | 1607 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1608 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
1609 | cmd = options.subsystem_command[i]; | |
1610 | if (stat(cmd, &st) < 0) { | |
1611 | error("subsystem: cannot stat %s: %s", cmd, | |
1612 | strerror(errno)); | |
1613 | break; | |
1614 | } | |
1615 | debug("subsystem: exec() %s", cmd); | |
e5d7a405 | 1616 | s->is_subsystem = 1; |
01855277 | 1617 | do_exec(s, cmd); |
38c295d6 | 1618 | success = 1; |
24932ee9 | 1619 | break; |
38c295d6 | 1620 | } |
1621 | } | |
1622 | ||
1623 | if (!success) | |
8875ca97 | 1624 | log("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1625 | subsys); |
38c295d6 | 1626 | |
0b242b12 | 1627 | xfree(subsys); |
1628 | return success; | |
1629 | } | |
1630 | ||
396c147e | 1631 | static int |
0b242b12 | 1632 | session_x11_req(Session *s) |
1633 | { | |
8dcd9d5c | 1634 | int success; |
0b242b12 | 1635 | |
1636 | s->single_connection = packet_get_char(); | |
1637 | s->auth_proto = packet_get_string(NULL); | |
1638 | s->auth_data = packet_get_string(NULL); | |
1639 | s->screen = packet_get_int(); | |
95500969 | 1640 | packet_check_eom(); |
0b242b12 | 1641 | |
8dcd9d5c | 1642 | success = session_setup_x11fwd(s); |
1643 | if (!success) { | |
0b242b12 | 1644 | xfree(s->auth_proto); |
1645 | xfree(s->auth_data); | |
1500bcdd | 1646 | s->auth_proto = NULL; |
1647 | s->auth_data = NULL; | |
0b242b12 | 1648 | } |
8dcd9d5c | 1649 | return success; |
0b242b12 | 1650 | } |
1651 | ||
396c147e | 1652 | static int |
38c295d6 | 1653 | session_shell_req(Session *s) |
1654 | { | |
95500969 | 1655 | packet_check_eom(); |
dac6753b | 1656 | do_exec(s, NULL); |
38c295d6 | 1657 | return 1; |
1658 | } | |
1659 | ||
396c147e | 1660 | static int |
38c295d6 | 1661 | session_exec_req(Session *s) |
1662 | { | |
1e3b8b07 | 1663 | u_int len; |
38c295d6 | 1664 | char *command = packet_get_string(&len); |
95500969 | 1665 | packet_check_eom(); |
dac6753b | 1666 | do_exec(s, command); |
c95add71 | 1667 | xfree(command); |
38c295d6 | 1668 | return 1; |
1669 | } | |
1670 | ||
396c147e | 1671 | static int |
fa08c86b | 1672 | session_auth_agent_req(Session *s) |
1673 | { | |
1674 | static int called = 0; | |
95500969 | 1675 | packet_check_eom(); |
d343d900 | 1676 | if (no_agent_forwarding_flag) { |
1677 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1678 | return 0; | |
1679 | } | |
fa08c86b | 1680 | if (called) { |
1681 | return 0; | |
1682 | } else { | |
1683 | called = 1; | |
1684 | return auth_input_request_forwarding(s->pw); | |
1685 | } | |
1686 | } | |
1687 | ||
7899c98f | 1688 | int |
1689 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 1690 | { |
e78a59f5 | 1691 | int success = 0; |
e78a59f5 | 1692 | Session *s; |
e78a59f5 | 1693 | |
7899c98f | 1694 | if ((s = session_by_channel(c->self)) == NULL) { |
1695 | log("session_input_channel_req: no session %d req %.100s", | |
1696 | c->self, rtype); | |
1697 | return 0; | |
1698 | } | |
1699 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 1700 | |
1701 | /* | |
e5d7a405 | 1702 | * a session is in LARVAL state until a shell, a command |
1703 | * or a subsystem is executed | |
e78a59f5 | 1704 | */ |
1705 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1706 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1707 | success = session_shell_req(s); |
e78a59f5 | 1708 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1709 | success = session_exec_req(s); |
e78a59f5 | 1710 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1711 | success = session_pty_req(s); |
0b242b12 | 1712 | } else if (strcmp(rtype, "x11-req") == 0) { |
1713 | success = session_x11_req(s); | |
fa08c86b | 1714 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1715 | success = session_auth_agent_req(s); | |
0b242b12 | 1716 | } else if (strcmp(rtype, "subsystem") == 0) { |
1717 | success = session_subsystem_req(s); | |
e78a59f5 | 1718 | } |
1719 | } | |
1720 | if (strcmp(rtype, "window-change") == 0) { | |
1721 | success = session_window_change_req(s); | |
1722 | } | |
7899c98f | 1723 | return success; |
e78a59f5 | 1724 | } |
1725 | ||
1726 | void | |
1727 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1728 | { | |
1729 | if (!compat20) | |
1730 | fatal("session_set_fds: called for proto != 2.0"); | |
1731 | /* | |
1732 | * now that have a child and a pipe to the child, | |
1733 | * we can activate our channel and register the fd's | |
1734 | */ | |
1735 | if (s->chanid == -1) | |
1736 | fatal("no channel for session %d", s->self); | |
1737 | channel_set_fds(s->chanid, | |
1738 | fdout, fdin, fderr, | |
a22aff1f | 1739 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 1740 | 1, |
1741 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 1742 | } |
1743 | ||
86066315 | 1744 | /* |
1745 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
1746 | * (e.g., due to a dropped connection). | |
1747 | */ | |
1853d1ef | 1748 | void |
1749 | session_pty_cleanup2(void *session) | |
7368a6c8 | 1750 | { |
86066315 | 1751 | Session *s = session; |
1752 | ||
1753 | if (s == NULL) { | |
1754 | error("session_pty_cleanup: no session"); | |
1755 | return; | |
1756 | } | |
1757 | if (s->ttyfd == -1) | |
7368a6c8 | 1758 | return; |
1759 | ||
0725ea77 | 1760 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 1761 | |
7368a6c8 | 1762 | /* Record that the user has logged out. */ |
86066315 | 1763 | if (s->pid != 0) |
f3837bc6 | 1764 | record_logout(s->pid, s->tty, s->pw->pw_name); |
7368a6c8 | 1765 | |
1766 | /* Release the pseudo-tty. */ | |
1853d1ef | 1767 | if (getuid() == 0) |
1768 | pty_release(s->tty); | |
7368a6c8 | 1769 | |
1770 | /* | |
1771 | * Close the server side of the socket pairs. We must do this after | |
1772 | * the pty cleanup, so that another process doesn't get this pty | |
1773 | * while we're still cleaning up. | |
1774 | */ | |
1775 | if (close(s->ptymaster) < 0) | |
1853d1ef | 1776 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
efcc9957 | 1777 | |
1778 | /* unlink pty from session */ | |
1779 | s->ttyfd = -1; | |
7368a6c8 | 1780 | } |
e78a59f5 | 1781 | |
1853d1ef | 1782 | void |
1783 | session_pty_cleanup(void *session) | |
1784 | { | |
1785 | PRIVSEP(session_pty_cleanup2(session)); | |
1786 | } | |
1787 | ||
396c147e | 1788 | static void |
e78a59f5 | 1789 | session_exit_message(Session *s, int status) |
1790 | { | |
1791 | Channel *c; | |
5a4ae906 | 1792 | |
1793 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 1794 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 1795 | s->self, s->chanid); |
c457707e | 1796 | debug("session_exit_message: session %d channel %d pid %ld", |
1797 | s->self, s->chanid, (long)s->pid); | |
e78a59f5 | 1798 | |
1799 | if (WIFEXITED(status)) { | |
5a4ae906 | 1800 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 1801 | packet_put_int(WEXITSTATUS(status)); |
1802 | packet_send(); | |
1803 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 1804 | channel_request_start(s->chanid, "exit-signal", 0); |
e78a59f5 | 1805 | packet_put_int(WTERMSIG(status)); |
a64009ad | 1806 | #ifdef WCOREDUMP |
e78a59f5 | 1807 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1808 | #else /* WCOREDUMP */ |
1809 | packet_put_char(0); | |
1810 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1811 | packet_put_cstring(""); |
1812 | packet_put_cstring(""); | |
1813 | packet_send(); | |
1814 | } else { | |
1815 | /* Some weird exit cause. Just exit. */ | |
1816 | packet_disconnect("wait returned status %04x.", status); | |
1817 | } | |
1818 | ||
1819 | /* disconnect channel */ | |
1820 | debug("session_exit_message: release channel %d", s->chanid); | |
1821 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1822 | /* |
1823 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1824 | * interested in data we write. | |
1825 | * Note that we must not call 'chan_read_failed', since there could | |
1826 | * be some more data waiting in the pipe. | |
1827 | */ | |
0b242b12 | 1828 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1829 | chan_write_failed(c); | |
e78a59f5 | 1830 | s->chanid = -1; |
1831 | } | |
1832 | ||
1853d1ef | 1833 | void |
86066315 | 1834 | session_close(Session *s) |
e78a59f5 | 1835 | { |
c457707e | 1836 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
86066315 | 1837 | if (s->ttyfd != -1) { |
1838 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
1839 | session_pty_cleanup(s); | |
1840 | } | |
e78a59f5 | 1841 | if (s->term) |
1842 | xfree(s->term); | |
1843 | if (s->display) | |
1844 | xfree(s->display); | |
f9314d9a | 1845 | if (s->auth_display) |
1846 | xfree(s->auth_display); | |
e78a59f5 | 1847 | if (s->auth_data) |
1848 | xfree(s->auth_data); | |
1849 | if (s->auth_proto) | |
1850 | xfree(s->auth_proto); | |
1851 | s->used = 0; | |
1d1ffb87 | 1852 | session_proctitle(s); |
e78a59f5 | 1853 | } |
1854 | ||
1855 | void | |
1856 | session_close_by_pid(pid_t pid, int status) | |
1857 | { | |
1858 | Session *s = session_by_pid(pid); | |
1859 | if (s == NULL) { | |
c457707e | 1860 | debug("session_close_by_pid: no session for pid %ld", |
1861 | (long)pid); | |
e78a59f5 | 1862 | return; |
1863 | } | |
1864 | if (s->chanid != -1) | |
1865 | session_exit_message(s, status); | |
1866 | session_close(s); | |
1867 | } | |
1868 | ||
1869 | /* | |
1870 | * this is called when a channel dies before | |
1871 | * the session 'child' itself dies | |
1872 | */ | |
1873 | void | |
1874 | session_close_by_channel(int id, void *arg) | |
1875 | { | |
1876 | Session *s = session_by_channel(id); | |
1877 | if (s == NULL) { | |
418e724c | 1878 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 1879 | return; |
1880 | } | |
c457707e | 1881 | debug("session_close_by_channel: channel %d child %ld", |
1882 | id, (long)s->pid); | |
d5f24f94 | 1883 | if (s->pid != 0) { |
418e724c | 1884 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 1885 | /* |
1886 | * delay detach of session, but release pty, since | |
1887 | * the fd's to the child are already closed | |
1888 | */ | |
1889 | if (s->ttyfd != -1) { | |
1890 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
1891 | session_pty_cleanup(s); | |
1892 | } | |
418e724c | 1893 | return; |
e78a59f5 | 1894 | } |
418e724c | 1895 | /* detach by removing callback */ |
1896 | channel_cancel_cleanup(s->chanid); | |
1897 | s->chanid = -1; | |
d5f24f94 | 1898 | session_close(s); |
1899 | } | |
1900 | ||
1901 | void | |
1853d1ef | 1902 | session_destroy_all(void (*closefunc)(Session *)) |
d5f24f94 | 1903 | { |
1904 | int i; | |
184eed6a | 1905 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 1906 | Session *s = &sessions[i]; |
1853d1ef | 1907 | if (s->used) { |
1908 | if (closefunc != NULL) | |
1909 | closefunc(s); | |
1910 | else | |
1911 | session_close(s); | |
1912 | } | |
d5f24f94 | 1913 | } |
e78a59f5 | 1914 | } |
1915 | ||
396c147e | 1916 | static char * |
1d1ffb87 | 1917 | session_tty_list(void) |
1918 | { | |
1919 | static char buf[1024]; | |
1920 | int i; | |
1921 | buf[0] = '\0'; | |
184eed6a | 1922 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 1923 | Session *s = &sessions[i]; |
1924 | if (s->used && s->ttyfd != -1) { | |
1925 | if (buf[0] != '\0') | |
1926 | strlcat(buf, ",", sizeof buf); | |
1927 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1928 | } | |
1929 | } | |
1930 | if (buf[0] == '\0') | |
1931 | strlcpy(buf, "notty", sizeof buf); | |
1932 | return buf; | |
1933 | } | |
1934 | ||
1935 | void | |
1936 | session_proctitle(Session *s) | |
1937 | { | |
1938 | if (s->pw == NULL) | |
1939 | error("no user for session %d", s->self); | |
1940 | else | |
1941 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
1942 | } | |
1943 | ||
8dcd9d5c | 1944 | int |
1945 | session_setup_x11fwd(Session *s) | |
1946 | { | |
8dcd9d5c | 1947 | struct stat st; |
c9d0ad9b | 1948 | char display[512], auth_display[512]; |
1949 | char hostname[MAXHOSTNAMELEN]; | |
8dcd9d5c | 1950 | |
1951 | if (no_x11_forwarding_flag) { | |
1952 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
1953 | return 0; | |
1954 | } | |
1955 | if (!options.x11_forwarding) { | |
1956 | debug("X11 forwarding disabled in server configuration file."); | |
1957 | return 0; | |
1958 | } | |
1959 | if (!options.xauth_location || | |
1960 | (stat(options.xauth_location, &st) == -1)) { | |
1961 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
1962 | return 0; | |
1963 | } | |
ff027d84 | 1964 | if (options.use_login) { |
1965 | packet_send_debug("X11 forwarding disabled; " | |
1966 | "not compatible with UseLogin=yes."); | |
1967 | return 0; | |
1968 | } | |
b44de2b1 | 1969 | if (s->display != NULL) { |
8dcd9d5c | 1970 | debug("X11 display already set."); |
1971 | return 0; | |
1972 | } | |
c9d0ad9b | 1973 | s->display_number = x11_create_display_inet(options.x11_display_offset, |
e6e573bd | 1974 | options.x11_use_localhost, s->single_connection); |
c9d0ad9b | 1975 | if (s->display_number == -1) { |
b44de2b1 | 1976 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 1977 | return 0; |
1978 | } | |
c9d0ad9b | 1979 | |
1980 | /* Set up a suitable value for the DISPLAY variable. */ | |
1981 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
1982 | fatal("gethostname: %.100s", strerror(errno)); | |
1983 | /* | |
1984 | * auth_display must be used as the displayname when the | |
1985 | * authorization entry is added with xauth(1). This will be | |
1986 | * different than the DISPLAY string for localhost displays. | |
1987 | */ | |
e6e573bd | 1988 | if (options.x11_use_localhost) { |
c9d0ad9b | 1989 | snprintf(display, sizeof display, "localhost:%d.%d", |
1990 | s->display_number, s->screen); | |
f9314d9a | 1991 | snprintf(auth_display, sizeof auth_display, "unix:%d.%d", |
1992 | s->display_number, s->screen); | |
c9d0ad9b | 1993 | s->display = xstrdup(display); |
f9314d9a | 1994 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 1995 | } else { |
1996 | #ifdef IPADDR_IN_DISPLAY | |
1997 | struct hostent *he; | |
1998 | struct in_addr my_addr; | |
1999 | ||
2000 | he = gethostbyname(hostname); | |
2001 | if (he == NULL) { | |
2002 | error("Can't get IP address for X11 DISPLAY."); | |
2003 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
2004 | return 0; | |
2005 | } | |
2006 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
2007 | snprintf(display, sizeof display, "%.50s:%d.%d", inet_ntoa(my_addr), | |
2008 | s->display_number, s->screen); | |
2009 | #else | |
2010 | snprintf(display, sizeof display, "%.400s:%d.%d", hostname, | |
2011 | s->display_number, s->screen); | |
2012 | #endif | |
2013 | s->display = xstrdup(display); | |
f9314d9a | 2014 | s->auth_display = xstrdup(display); |
c9d0ad9b | 2015 | } |
2016 | ||
8dcd9d5c | 2017 | return 1; |
2018 | } | |
2019 | ||
396c147e | 2020 | static void |
59c97189 | 2021 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 2022 | { |
57156994 | 2023 | server_loop2(authctxt); |
e78a59f5 | 2024 | } |