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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" | |
5dd82c23 | 36 | RCSID("$OpenBSD: session.c,v 1.128 2002/02/16 00:51:44 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" |
e78a59f5 | 59 | |
089fbbd2 | 60 | #if defined(HAVE_USERSEC_H) |
61 | #include <usersec.h> | |
62 | #endif | |
63 | ||
3c62e7eb | 64 | #ifdef HAVE_CYGWIN |
65 | #include <windows.h> | |
66 | #include <sys/cygwin.h> | |
67 | #define is_winnt (GetVersion() < 0x80000000) | |
68 | #endif | |
69 | ||
7368a6c8 | 70 | /* types */ |
71 | ||
72 | #define TTYSZ 64 | |
73 | typedef struct Session Session; | |
74 | struct Session { | |
75 | int used; | |
76 | int self; | |
ced49be2 | 77 | struct passwd *pw; |
78 | Authctxt *authctxt; | |
7368a6c8 | 79 | pid_t pid; |
80 | /* tty */ | |
81 | char *term; | |
82 | int ptyfd, ttyfd, ptymaster; | |
83 | int row, col, xpixel, ypixel; | |
84 | char tty[TTYSZ]; | |
85 | /* X11 */ | |
c9d0ad9b | 86 | int display_number; |
7368a6c8 | 87 | char *display; |
88 | int screen; | |
f9314d9a | 89 | char *auth_display; |
7368a6c8 | 90 | char *auth_proto; |
91 | char *auth_data; | |
0b242b12 | 92 | int single_connection; |
7368a6c8 | 93 | /* proto 2 */ |
94 | int chanid; | |
e5d7a405 | 95 | int is_subsystem; |
7368a6c8 | 96 | }; |
97 | ||
98 | /* func */ | |
99 | ||
100 | Session *session_new(void); | |
9c328529 | 101 | void session_set_fds(Session *, int, int, int); |
102 | static void session_pty_cleanup(void *); | |
103 | void session_proctitle(Session *); | |
104 | int session_setup_x11fwd(Session *); | |
105 | void do_exec_pty(Session *, const char *); | |
106 | void do_exec_no_pty(Session *, const char *); | |
107 | void do_exec(Session *, const char *); | |
108 | void do_login(Session *, const char *); | |
8a9ac95d | 109 | #ifdef LOGIN_NEEDS_UTMPX |
110 | static void do_pre_login(Session *s); | |
111 | #endif | |
9c328529 | 112 | void do_child(Session *, const char *); |
f2c2fd71 | 113 | void do_motd(void); |
9c328529 | 114 | int check_quietlogin(Session *, const char *); |
7368a6c8 | 115 | |
396c147e | 116 | static void do_authenticated1(Authctxt *); |
117 | static void do_authenticated2(Authctxt *); | |
9c328529 | 118 | |
396c147e | 119 | static void session_close(Session *); |
120 | static int session_pty_req(Session *); | |
bb5639fe | 121 | |
7368a6c8 | 122 | /* import */ |
123 | extern ServerOptions options; | |
124 | extern char *__progname; | |
125 | extern int log_stderr; | |
126 | extern int debug_flag; | |
1e3b8b07 | 127 | extern u_int utmp_len; |
089fbbd2 | 128 | extern int startup_pipe; |
e78e738a | 129 | extern void destroy_sensitive_data(void); |
089fbbd2 | 130 | |
b5e300c2 | 131 | /* original command from peer. */ |
c95add71 | 132 | const char *original_command = NULL; |
b5e300c2 | 133 | |
7368a6c8 | 134 | /* data */ |
135 | #define MAX_SESSIONS 10 | |
136 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 137 | |
c1ef8333 | 138 | #ifdef WITH_AIXAUTHENTICATE |
c1ef8333 | 139 | char *aixloginmsg; |
140 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 141 | |
2e73a022 | 142 | #ifdef HAVE_LOGIN_CAP |
143 | static login_cap_t *lc; | |
144 | #endif | |
145 | ||
bb5639fe | 146 | void |
147 | do_authenticated(Authctxt *authctxt) | |
148 | { | |
149 | /* | |
150 | * Cancel the alarm we set to limit the time taken for | |
151 | * authentication. | |
152 | */ | |
153 | alarm(0); | |
154 | if (startup_pipe != -1) { | |
155 | close(startup_pipe); | |
156 | startup_pipe = -1; | |
157 | } | |
158 | #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD) | |
159 | if ((lc = login_getclass(authctxt->pw->pw_class)) == NULL) { | |
160 | error("unable to get login class"); | |
161 | return; | |
162 | } | |
e78e738a | 163 | #ifdef BSD_AUTH |
164 | if (auth_approval(NULL, lc, authctxt->pw->pw_name, "ssh") <= 0) { | |
165 | packet_disconnect("Approval failure for %s", | |
166 | authctxt->pw->pw_name); | |
167 | } | |
168 | #endif | |
bb5639fe | 169 | #endif |
19e810f6 | 170 | #ifdef WITH_AIXAUTHENTICATE |
171 | /* We don't have a pty yet, so just label the line as "ssh" */ | |
172 | if (loginsuccess(authctxt->user, | |
983784a1 | 173 | get_canonical_hostname(options.verify_reverse_mapping), |
19e810f6 | 174 | "ssh", &aixloginmsg) < 0) |
175 | aixloginmsg = NULL; | |
176 | #endif /* WITH_AIXAUTHENTICATE */ | |
177 | ||
bb5639fe | 178 | /* setup the channel layer */ |
179 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
180 | channel_permit_all_opens(); | |
181 | ||
182 | if (compat20) | |
183 | do_authenticated2(authctxt); | |
184 | else | |
185 | do_authenticated1(authctxt); | |
e4f7282d | 186 | |
b44de2b1 | 187 | /* remove agent socket */ |
e4f7282d | 188 | if (auth_get_socket_name()) |
f0f32b8e | 189 | auth_sock_cleanup_proc(authctxt->pw); |
ced49be2 | 190 | #ifdef KRB4 |
191 | if (options.kerberos_ticket_cleanup) | |
192 | krb4_cleanup_proc(authctxt); | |
193 | #endif | |
194 | #ifdef KRB5 | |
195 | if (options.kerberos_ticket_cleanup) | |
196 | krb5_cleanup_proc(authctxt); | |
197 | #endif | |
bb5639fe | 198 | } |
199 | ||
7368a6c8 | 200 | /* |
201 | * Prepares for an interactive session. This is called after the user has | |
202 | * been successfully authenticated. During this message exchange, pseudo | |
203 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
204 | * are requested, etc. | |
205 | */ | |
396c147e | 206 | static void |
bb5639fe | 207 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 208 | { |
209 | Session *s; | |
7368a6c8 | 210 | char *command; |
54a5250f | 211 | int success, type, screen_flag; |
bb5639fe | 212 | int compression_level = 0, enable_compression_after_reply = 0; |
1e3b8b07 | 213 | u_int proto_len, data_len, dlen; |
7368a6c8 | 214 | |
215 | s = session_new(); | |
ced49be2 | 216 | s->authctxt = authctxt; |
bb5639fe | 217 | s->pw = authctxt->pw; |
2e73a022 | 218 | |
7368a6c8 | 219 | /* |
220 | * We stay in this loop until the client requests to execute a shell | |
221 | * or a command. | |
222 | */ | |
223 | for (;;) { | |
bb5639fe | 224 | success = 0; |
7368a6c8 | 225 | |
226 | /* Get a packet from the client. */ | |
54a5250f | 227 | type = packet_read(); |
7368a6c8 | 228 | |
229 | /* Process the packet. */ | |
230 | switch (type) { | |
231 | case SSH_CMSG_REQUEST_COMPRESSION: | |
7368a6c8 | 232 | compression_level = packet_get_int(); |
95500969 | 233 | packet_check_eom(); |
7368a6c8 | 234 | if (compression_level < 1 || compression_level > 9) { |
235 | packet_send_debug("Received illegal compression level %d.", | |
184eed6a | 236 | compression_level); |
7368a6c8 | 237 | break; |
238 | } | |
239 | /* Enable compression after we have responded with SUCCESS. */ | |
240 | enable_compression_after_reply = 1; | |
241 | success = 1; | |
242 | break; | |
243 | ||
244 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 245 | success = session_pty_req(s); |
7368a6c8 | 246 | break; |
247 | ||
248 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 249 | s->auth_proto = packet_get_string(&proto_len); |
250 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 251 | |
2af09193 | 252 | screen_flag = packet_get_protocol_flags() & |
253 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
254 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
255 | ||
256 | if (packet_remaining() == 4) { | |
257 | if (!screen_flag) | |
258 | debug2("Buggy client: " | |
259 | "X11 screen flag missing"); | |
7368a6c8 | 260 | s->screen = packet_get_int(); |
c8b058b4 | 261 | } else { |
7368a6c8 | 262 | s->screen = 0; |
c8b058b4 | 263 | } |
95500969 | 264 | packet_check_eom(); |
8dcd9d5c | 265 | success = session_setup_x11fwd(s); |
266 | if (!success) { | |
267 | xfree(s->auth_proto); | |
268 | xfree(s->auth_data); | |
1500bcdd | 269 | s->auth_proto = NULL; |
270 | s->auth_data = NULL; | |
7368a6c8 | 271 | } |
7368a6c8 | 272 | break; |
7368a6c8 | 273 | |
274 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
275 | if (no_agent_forwarding_flag || compat13) { | |
276 | debug("Authentication agent forwarding not permitted for this authentication."); | |
277 | break; | |
278 | } | |
279 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 280 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 281 | break; |
282 | ||
283 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
284 | if (no_port_forwarding_flag) { | |
285 | debug("Port forwarding not permitted for this authentication."); | |
286 | break; | |
287 | } | |
33de75a3 | 288 | if (!options.allow_tcp_forwarding) { |
289 | debug("Port forwarding not permitted."); | |
290 | break; | |
291 | } | |
7368a6c8 | 292 | debug("Received TCP/IP port forwarding request."); |
bb5639fe | 293 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 294 | success = 1; |
295 | break; | |
296 | ||
297 | case SSH_CMSG_MAX_PACKET_SIZE: | |
298 | if (packet_set_maxsize(packet_get_int()) > 0) | |
299 | success = 1; | |
300 | break; | |
184eed6a | 301 | |
ced49be2 | 302 | #if defined(AFS) || defined(KRB5) |
303 | case SSH_CMSG_HAVE_KERBEROS_TGT: | |
304 | if (!options.kerberos_tgt_passing) { | |
305 | verbose("Kerberos TGT passing disabled."); | |
306 | } else { | |
307 | char *kdata = packet_get_string(&dlen); | |
95500969 | 308 | packet_check_eom(); |
184eed6a | 309 | |
ced49be2 | 310 | /* XXX - 0x41, see creds_to_radix version */ |
311 | if (kdata[0] != 0x41) { | |
312 | #ifdef KRB5 | |
313 | krb5_data tgt; | |
314 | tgt.data = kdata; | |
315 | tgt.length = dlen; | |
184eed6a | 316 | |
ced49be2 | 317 | if (auth_krb5_tgt(s->authctxt, &tgt)) |
318 | success = 1; | |
319 | else | |
320 | verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user); | |
321 | #endif /* KRB5 */ | |
322 | } else { | |
323 | #ifdef AFS | |
324 | if (auth_krb4_tgt(s->authctxt, kdata)) | |
325 | success = 1; | |
326 | else | |
327 | verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user); | |
328 | #endif /* AFS */ | |
329 | } | |
330 | xfree(kdata); | |
331 | } | |
332 | break; | |
333 | #endif /* AFS || KRB5 */ | |
184eed6a | 334 | |
ced49be2 | 335 | #ifdef AFS |
336 | case SSH_CMSG_HAVE_AFS_TOKEN: | |
337 | if (!options.afs_token_passing || !k_hasafs()) { | |
338 | verbose("AFS token passing disabled."); | |
339 | } else { | |
340 | /* Accept AFS token. */ | |
341 | char *token = packet_get_string(&dlen); | |
95500969 | 342 | packet_check_eom(); |
184eed6a | 343 | |
ced49be2 | 344 | if (auth_afs_token(s->authctxt, token)) |
345 | success = 1; | |
346 | else | |
347 | verbose("AFS token refused for %.100s", | |
348 | s->authctxt->user); | |
349 | xfree(token); | |
350 | } | |
351 | break; | |
352 | #endif /* AFS */ | |
7368a6c8 | 353 | |
354 | case SSH_CMSG_EXEC_SHELL: | |
355 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 356 | if (type == SSH_CMSG_EXEC_CMD) { |
357 | command = packet_get_string(&dlen); | |
358 | debug("Exec command '%.500s'", command); | |
c95add71 | 359 | do_exec(s, command); |
360 | xfree(command); | |
7368a6c8 | 361 | } else { |
c95add71 | 362 | do_exec(s, NULL); |
7368a6c8 | 363 | } |
95500969 | 364 | packet_check_eom(); |
fc2a1d28 | 365 | session_close(s); |
7368a6c8 | 366 | return; |
367 | ||
368 | default: | |
369 | /* | |
370 | * Any unknown messages in this phase are ignored, | |
371 | * and a failure message is returned. | |
372 | */ | |
373 | log("Unknown packet type received after authentication: %d", type); | |
374 | } | |
375 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
376 | packet_send(); | |
377 | packet_write_wait(); | |
378 | ||
379 | /* Enable compression now that we have replied if appropriate. */ | |
380 | if (enable_compression_after_reply) { | |
381 | enable_compression_after_reply = 0; | |
382 | packet_start_compression(compression_level); | |
383 | } | |
384 | } | |
385 | } | |
386 | ||
387 | /* | |
388 | * This is called to fork and execute a command when we have no tty. This | |
389 | * will call do_child from the child, and server_loop from the parent after | |
390 | * setting up file descriptors and such. | |
391 | */ | |
6ae2364d | 392 | void |
65068d16 | 393 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 394 | { |
395 | int pid; | |
396 | ||
397 | #ifdef USE_PIPES | |
398 | int pin[2], pout[2], perr[2]; | |
399 | /* Allocate pipes for communicating with the program. */ | |
400 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
401 | packet_disconnect("Could not create pipes: %.100s", | |
402 | strerror(errno)); | |
403 | #else /* USE_PIPES */ | |
404 | int inout[2], err[2]; | |
405 | /* Uses socket pairs to communicate with the program. */ | |
406 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
407 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
408 | packet_disconnect("Could not create socket pairs: %.100s", | |
409 | strerror(errno)); | |
410 | #endif /* USE_PIPES */ | |
411 | if (s == NULL) | |
412 | fatal("do_exec_no_pty: no session"); | |
413 | ||
1d1ffb87 | 414 | session_proctitle(s); |
7368a6c8 | 415 | |
b19d61d7 | 416 | #if defined(USE_PAM) |
78220944 | 417 | do_pam_session(s->pw->pw_name, NULL); |
9afbfcfa | 418 | do_pam_setcred(1); |
7eb73cc1 | 419 | if (is_pam_password_change_required()) |
420 | packet_disconnect("Password change required but no " | |
421 | "TTY available"); | |
266140a8 | 422 | #endif /* USE_PAM */ |
423 | ||
7368a6c8 | 424 | /* Fork the child. */ |
425 | if ((pid = fork()) == 0) { | |
426 | /* Child. Reinitialize the log since the pid has changed. */ | |
427 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
428 | ||
429 | /* | |
430 | * Create a new session and process group since the 4.4BSD | |
431 | * setlogin() affects the entire process group. | |
432 | */ | |
433 | if (setsid() < 0) | |
434 | error("setsid failed: %.100s", strerror(errno)); | |
435 | ||
436 | #ifdef USE_PIPES | |
437 | /* | |
438 | * Redirect stdin. We close the parent side of the socket | |
439 | * pair, and make the child side the standard input. | |
440 | */ | |
441 | close(pin[1]); | |
442 | if (dup2(pin[0], 0) < 0) | |
443 | perror("dup2 stdin"); | |
444 | close(pin[0]); | |
445 | ||
446 | /* Redirect stdout. */ | |
447 | close(pout[0]); | |
448 | if (dup2(pout[1], 1) < 0) | |
449 | perror("dup2 stdout"); | |
450 | close(pout[1]); | |
451 | ||
452 | /* Redirect stderr. */ | |
453 | close(perr[0]); | |
454 | if (dup2(perr[1], 2) < 0) | |
455 | perror("dup2 stderr"); | |
456 | close(perr[1]); | |
457 | #else /* USE_PIPES */ | |
458 | /* | |
459 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
460 | * use the same socket, as some programs (particularly rdist) | |
461 | * seem to depend on it. | |
462 | */ | |
463 | close(inout[1]); | |
464 | close(err[1]); | |
465 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
466 | perror("dup2 stdin"); | |
467 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
468 | perror("dup2 stdout"); | |
469 | if (dup2(err[0], 2) < 0) /* stderr */ | |
470 | perror("dup2 stderr"); | |
471 | #endif /* USE_PIPES */ | |
472 | ||
473 | /* Do processing for the child (exec command etc). */ | |
56b3e9ce | 474 | do_child(s, command); |
7368a6c8 | 475 | /* NOTREACHED */ |
476 | } | |
3c62e7eb | 477 | #ifdef HAVE_CYGWIN |
478 | if (is_winnt) | |
479 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
480 | #endif | |
7368a6c8 | 481 | if (pid < 0) |
482 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
483 | s->pid = pid; | |
b5c334cc | 484 | /* Set interactive/non-interactive mode. */ |
485 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 486 | #ifdef USE_PIPES |
487 | /* We are the parent. Close the child sides of the pipes. */ | |
488 | close(pin[0]); | |
489 | close(pout[1]); | |
490 | close(perr[1]); | |
491 | ||
e78a59f5 | 492 | if (compat20) { |
e5d7a405 | 493 | session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); |
e78a59f5 | 494 | } else { |
495 | /* Enter the interactive session. */ | |
496 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 497 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 498 | } |
7368a6c8 | 499 | #else /* USE_PIPES */ |
500 | /* We are the parent. Close the child sides of the socket pairs. */ | |
501 | close(inout[0]); | |
502 | close(err[0]); | |
503 | ||
504 | /* | |
505 | * Enter the interactive session. Note: server_loop must be able to | |
506 | * handle the case that fdin and fdout are the same. | |
507 | */ | |
e78a59f5 | 508 | if (compat20) { |
e5d7a405 | 509 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 510 | } else { |
511 | server_loop(pid, inout[1], inout[1], err[1]); | |
512 | /* server_loop has closed inout[1] and err[1]. */ | |
513 | } | |
7368a6c8 | 514 | #endif /* USE_PIPES */ |
515 | } | |
516 | ||
517 | /* | |
518 | * This is called to fork and execute a command when we have a tty. This | |
519 | * will call do_child from the child, and server_loop from the parent after | |
520 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
521 | * lastlog, and other such operations. | |
522 | */ | |
6ae2364d | 523 | void |
65068d16 | 524 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 525 | { |
7368a6c8 | 526 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 527 | pid_t pid; |
7368a6c8 | 528 | |
529 | if (s == NULL) | |
530 | fatal("do_exec_pty: no session"); | |
531 | ptyfd = s->ptyfd; | |
532 | ttyfd = s->ttyfd; | |
533 | ||
b19d61d7 | 534 | #if defined(USE_PAM) |
bb5639fe | 535 | do_pam_session(s->pw->pw_name, s->tty); |
9afbfcfa | 536 | do_pam_setcred(1); |
27cf96de | 537 | #endif |
266140a8 | 538 | |
7368a6c8 | 539 | /* Fork the child. */ |
540 | if ((pid = fork()) == 0) { | |
57156994 | 541 | |
c345cf9d | 542 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 543 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
7368a6c8 | 544 | /* Close the master side of the pseudo tty. */ |
545 | close(ptyfd); | |
546 | ||
547 | /* Make the pseudo tty our controlling tty. */ | |
548 | pty_make_controlling_tty(&ttyfd, s->tty); | |
549 | ||
05fd093c | 550 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
551 | if (dup2(ttyfd, 0) < 0) | |
552 | error("dup2 stdin: %s", strerror(errno)); | |
553 | if (dup2(ttyfd, 1) < 0) | |
554 | error("dup2 stdout: %s", strerror(errno)); | |
555 | if (dup2(ttyfd, 2) < 0) | |
556 | error("dup2 stderr: %s", strerror(errno)); | |
7368a6c8 | 557 | |
558 | /* Close the extra descriptor for the pseudo tty. */ | |
559 | close(ttyfd); | |
560 | ||
c345cf9d | 561 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 562 | #ifndef HAVE_OSF_SIA |
a22aff1f | 563 | if (!(options.use_login && command == NULL)) |
564 | do_login(s, command); | |
7e2d5fa4 | 565 | # ifdef LOGIN_NEEDS_UTMPX |
566 | else | |
567 | do_pre_login(s); | |
568 | # endif | |
c96a4aaf | 569 | #endif |
7368a6c8 | 570 | |
7368a6c8 | 571 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 572 | do_child(s, command); |
7368a6c8 | 573 | /* NOTREACHED */ |
574 | } | |
3c62e7eb | 575 | #ifdef HAVE_CYGWIN |
576 | if (is_winnt) | |
577 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
578 | #endif | |
7368a6c8 | 579 | if (pid < 0) |
580 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
581 | s->pid = pid; | |
582 | ||
583 | /* Parent. Close the slave side of the pseudo tty. */ | |
584 | close(ttyfd); | |
585 | ||
586 | /* | |
587 | * Create another descriptor of the pty master side for use as the | |
588 | * standard input. We could use the original descriptor, but this | |
589 | * simplifies code in server_loop. The descriptor is bidirectional. | |
590 | */ | |
591 | fdout = dup(ptyfd); | |
592 | if (fdout < 0) | |
593 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
594 | ||
595 | /* we keep a reference to the pty master */ | |
596 | ptymaster = dup(ptyfd); | |
597 | if (ptymaster < 0) | |
598 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
599 | s->ptymaster = ptymaster; | |
600 | ||
601 | /* Enter interactive session. */ | |
b5c334cc | 602 | packet_set_interactive(1); |
e78a59f5 | 603 | if (compat20) { |
604 | session_set_fds(s, ptyfd, fdout, -1); | |
605 | } else { | |
606 | server_loop(pid, ptyfd, fdout, -1); | |
607 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 608 | } |
7368a6c8 | 609 | } |
610 | ||
7e2d5fa4 | 611 | #ifdef LOGIN_NEEDS_UTMPX |
0e0144b7 | 612 | static void |
7e2d5fa4 | 613 | do_pre_login(Session *s) |
614 | { | |
615 | socklen_t fromlen; | |
616 | struct sockaddr_storage from; | |
617 | pid_t pid = getpid(); | |
618 | ||
619 | /* | |
620 | * Get IP address of client. If the connection is not a socket, let | |
621 | * the address be 0.0.0.0. | |
622 | */ | |
623 | memset(&from, 0, sizeof(from)); | |
624 | if (packet_connection_is_on_socket()) { | |
625 | fromlen = sizeof(from); | |
626 | if (getpeername(packet_get_connection_in(), | |
184eed6a | 627 | (struct sockaddr *) & from, &fromlen) < 0) { |
7e2d5fa4 | 628 | debug("getpeername: %.100s", strerror(errno)); |
629 | fatal_cleanup(); | |
630 | } | |
631 | } | |
632 | ||
633 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
983784a1 | 634 | get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping), |
7e2d5fa4 | 635 | (struct sockaddr *)&from); |
636 | } | |
637 | #endif | |
638 | ||
dac6753b | 639 | /* |
640 | * This is called to fork and execute a command. If another command is | |
641 | * to be forced, execute that instead. | |
642 | */ | |
643 | void | |
644 | do_exec(Session *s, const char *command) | |
645 | { | |
646 | if (forced_command) { | |
647 | original_command = command; | |
648 | command = forced_command; | |
dac6753b | 649 | debug("Forced command '%.900s'", command); |
650 | } | |
651 | ||
652 | if (s->ttyfd != -1) | |
653 | do_exec_pty(s, command); | |
654 | else | |
655 | do_exec_no_pty(s, command); | |
656 | ||
c95add71 | 657 | original_command = NULL; |
dac6753b | 658 | } |
659 | ||
f7342052 | 660 | |
c345cf9d | 661 | /* administrative, login(1)-like work */ |
662 | void | |
a22aff1f | 663 | do_login(Session *s, const char *command) |
c345cf9d | 664 | { |
c345cf9d | 665 | char *time_string; |
b5e300c2 | 666 | char hostname[MAXHOSTNAMELEN]; |
c345cf9d | 667 | socklen_t fromlen; |
668 | struct sockaddr_storage from; | |
c345cf9d | 669 | time_t last_login_time; |
670 | struct passwd * pw = s->pw; | |
671 | pid_t pid = getpid(); | |
672 | ||
673 | /* | |
674 | * Get IP address of client. If the connection is not a socket, let | |
675 | * the address be 0.0.0.0. | |
676 | */ | |
677 | memset(&from, 0, sizeof(from)); | |
678 | if (packet_connection_is_on_socket()) { | |
679 | fromlen = sizeof(from); | |
680 | if (getpeername(packet_get_connection_in(), | |
f7342052 | 681 | (struct sockaddr *) & from, &fromlen) < 0) { |
c345cf9d | 682 | debug("getpeername: %.100s", strerror(errno)); |
683 | fatal_cleanup(); | |
684 | } | |
685 | } | |
686 | ||
bcbf86ec | 687 | /* Get the time and hostname when the user last logged in. */ |
4f4648f9 | 688 | if (options.print_lastlog) { |
689 | hostname[0] = '\0'; | |
690 | last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name, | |
691 | hostname, sizeof(hostname)); | |
692 | } | |
bcbf86ec | 693 | |
c345cf9d | 694 | /* Record that there was a login on that tty from the remote host. */ |
695 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
bf4c5edc | 696 | get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping), |
46e3af7f | 697 | (struct sockaddr *)&from); |
c345cf9d | 698 | |
2919e060 | 699 | #ifdef USE_PAM |
700 | /* | |
701 | * If password change is needed, do it now. | |
702 | * This needs to occur before the ~/.hushlogin check. | |
703 | */ | |
e11aab29 | 704 | if (is_pam_password_change_required()) { |
2919e060 | 705 | print_pam_messages(); |
706 | do_pam_chauthtok(); | |
707 | } | |
708 | #endif | |
709 | ||
f2c2fd71 | 710 | if (check_quietlogin(s, command)) |
c345cf9d | 711 | return; |
712 | ||
713 | #ifdef USE_PAM | |
e11aab29 | 714 | if (!is_pam_password_change_required()) |
2919e060 | 715 | print_pam_messages(); |
c345cf9d | 716 | #endif /* USE_PAM */ |
717 | #ifdef WITH_AIXAUTHENTICATE | |
718 | if (aixloginmsg && *aixloginmsg) | |
719 | printf("%s\n", aixloginmsg); | |
720 | #endif /* WITH_AIXAUTHENTICATE */ | |
721 | ||
4f4648f9 | 722 | if (options.print_lastlog && last_login_time != 0) { |
c345cf9d | 723 | time_string = ctime(&last_login_time); |
724 | if (strchr(time_string, '\n')) | |
725 | *strchr(time_string, '\n') = 0; | |
f478712e | 726 | if (strcmp(hostname, "") == 0) |
c345cf9d | 727 | printf("Last login: %s\r\n", time_string); |
728 | else | |
bcbf86ec | 729 | printf("Last login: %s from %s\r\n", time_string, hostname); |
c345cf9d | 730 | } |
f2c2fd71 | 731 | |
732 | do_motd(); | |
733 | } | |
734 | ||
735 | /* | |
736 | * Display the message of the day. | |
737 | */ | |
738 | void | |
739 | do_motd(void) | |
740 | { | |
741 | FILE *f; | |
742 | char buf[256]; | |
743 | ||
c345cf9d | 744 | if (options.print_motd) { |
2e73a022 | 745 | #ifdef HAVE_LOGIN_CAP |
746 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
747 | "/etc/motd"), "r"); | |
748 | #else | |
c345cf9d | 749 | f = fopen("/etc/motd", "r"); |
2e73a022 | 750 | #endif |
c345cf9d | 751 | if (f) { |
752 | while (fgets(buf, sizeof(buf), f)) | |
753 | fputs(buf, stdout); | |
754 | fclose(f); | |
755 | } | |
756 | } | |
757 | } | |
758 | ||
9c328529 | 759 | |
760 | /* | |
761 | * Check for quiet login, either .hushlogin or command given. | |
762 | */ | |
763 | int | |
764 | check_quietlogin(Session *s, const char *command) | |
765 | { | |
766 | char buf[256]; | |
767 | struct passwd *pw = s->pw; | |
768 | struct stat st; | |
769 | ||
770 | /* Return 1 if .hushlogin exists or a command given. */ | |
771 | if (command != NULL) | |
772 | return 1; | |
773 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
774 | #ifdef HAVE_LOGIN_CAP | |
775 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
776 | return 1; | |
777 | #else | |
778 | if (stat(buf, &st) >= 0) | |
779 | return 1; | |
780 | #endif | |
781 | return 0; | |
782 | } | |
783 | ||
7368a6c8 | 784 | /* |
785 | * Sets the value of the given variable in the environment. If the variable | |
786 | * already exists, its value is overriden. | |
787 | */ | |
396c147e | 788 | static void |
1e3b8b07 | 789 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
184eed6a | 790 | const char *value) |
7368a6c8 | 791 | { |
1e3b8b07 | 792 | u_int i, namelen; |
7368a6c8 | 793 | char **env; |
794 | ||
795 | /* | |
796 | * Find the slot where the value should be stored. If the variable | |
797 | * already exists, we reuse the slot; otherwise we append a new slot | |
798 | * at the end of the array, expanding if necessary. | |
799 | */ | |
800 | env = *envp; | |
801 | namelen = strlen(name); | |
802 | for (i = 0; env[i]; i++) | |
803 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
804 | break; | |
805 | if (env[i]) { | |
806 | /* Reuse the slot. */ | |
807 | xfree(env[i]); | |
808 | } else { | |
809 | /* New variable. Expand if necessary. */ | |
810 | if (i >= (*envsizep) - 1) { | |
811 | (*envsizep) += 50; | |
812 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
813 | } | |
814 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
815 | env[i + 1] = NULL; | |
816 | } | |
817 | ||
818 | /* Allocate space and format the variable in the appropriate slot. */ | |
819 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
820 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
821 | } | |
822 | ||
823 | /* | |
824 | * Reads environment variables from the given file and adds/overrides them | |
825 | * into the environment. If the file does not exist, this does nothing. | |
826 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
827 | * and assignments of the form name=value. No other forms are allowed. | |
828 | */ | |
396c147e | 829 | static void |
1e3b8b07 | 830 | read_environment_file(char ***env, u_int *envsize, |
184eed6a | 831 | const char *filename) |
7368a6c8 | 832 | { |
833 | FILE *f; | |
834 | char buf[4096]; | |
835 | char *cp, *value; | |
836 | ||
837 | f = fopen(filename, "r"); | |
838 | if (!f) | |
839 | return; | |
840 | ||
841 | while (fgets(buf, sizeof(buf), f)) { | |
842 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
843 | ; | |
844 | if (!*cp || *cp == '#' || *cp == '\n') | |
845 | continue; | |
846 | if (strchr(cp, '\n')) | |
847 | *strchr(cp, '\n') = '\0'; | |
848 | value = strchr(cp, '='); | |
849 | if (value == NULL) { | |
850 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
851 | continue; | |
852 | } | |
71276795 | 853 | /* |
854 | * Replace the equals sign by nul, and advance value to | |
855 | * the value string. | |
856 | */ | |
7368a6c8 | 857 | *value = '\0'; |
858 | value++; | |
859 | child_set_env(env, envsize, cp, value); | |
860 | } | |
861 | fclose(f); | |
862 | } | |
863 | ||
760b35a6 | 864 | void copy_environment(char **source, char ***env, u_int *envsize) |
7368a6c8 | 865 | { |
760b35a6 | 866 | char *var_name, *var_val; |
7368a6c8 | 867 | int i; |
868 | ||
760b35a6 | 869 | if (source == NULL) |
7368a6c8 | 870 | return; |
2b87da3b | 871 | |
760b35a6 | 872 | for(i = 0; source[i] != NULL; i++) { |
873 | var_name = xstrdup(source[i]); | |
874 | if ((var_val = strstr(var_name, "=")) == NULL) { | |
875 | xfree(var_name); | |
7368a6c8 | 876 | continue; |
7368a6c8 | 877 | } |
760b35a6 | 878 | *var_val++ = '\0'; |
7368a6c8 | 879 | |
760b35a6 | 880 | debug3("Copy environment: %s=%s", var_name, var_val); |
881 | child_set_env(env, envsize, var_name, var_val); | |
882 | ||
883 | xfree(var_name); | |
22d89d24 | 884 | } |
885 | } | |
22d89d24 | 886 | |
f7342052 | 887 | static char ** |
888 | do_setup_env(Session *s, const char *shell) | |
7368a6c8 | 889 | { |
7368a6c8 | 890 | char buf[256]; |
f7342052 | 891 | u_int i, envsize; |
7368a6c8 | 892 | char **env; |
f7342052 | 893 | struct passwd *pw = s->pw; |
7368a6c8 | 894 | |
7368a6c8 | 895 | /* Initialize the environment. */ |
896 | envsize = 100; | |
897 | env = xmalloc(envsize * sizeof(char *)); | |
898 | env[0] = NULL; | |
899 | ||
3c62e7eb | 900 | #ifdef HAVE_CYGWIN |
901 | /* | |
902 | * The Windows environment contains some setting which are | |
903 | * important for a running system. They must not be dropped. | |
904 | */ | |
760b35a6 | 905 | copy_environment(environ, &env, &envsize); |
3c62e7eb | 906 | #endif |
907 | ||
7368a6c8 | 908 | if (!options.use_login) { |
909 | /* Set basic environment. */ | |
910 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
911 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
912 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
2e73a022 | 913 | #ifdef HAVE_LOGIN_CAP |
914 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH); | |
915 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 916 | #else /* HAVE_LOGIN_CAP */ |
917 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 918 | /* |
919 | * There's no standard path on Windows. The path contains | |
920 | * important components pointing to the system directories, | |
921 | * needed for loading shared libraries. So the path better | |
922 | * remains intact here. | |
923 | */ | |
7368a6c8 | 924 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
22d89d24 | 925 | # endif /* HAVE_CYGWIN */ |
926 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 927 | |
928 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
929 | _PATH_MAILDIR, pw->pw_name); | |
930 | child_set_env(&env, &envsize, "MAIL", buf); | |
931 | ||
932 | /* Normal systems set SHELL by default. */ | |
933 | child_set_env(&env, &envsize, "SHELL", shell); | |
934 | } | |
935 | if (getenv("TZ")) | |
936 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
937 | ||
938 | /* Set custom environment options from RSA authentication. */ | |
2548961d | 939 | if (!options.use_login) { |
940 | while (custom_environment) { | |
941 | struct envstring *ce = custom_environment; | |
942 | char *s = ce->s; | |
f7342052 | 943 | |
2548961d | 944 | for (i = 0; s[i] != '=' && s[i]; i++) |
945 | ; | |
946 | if (s[i] == '=') { | |
947 | s[i] = 0; | |
948 | child_set_env(&env, &envsize, s, s + i + 1); | |
949 | } | |
950 | custom_environment = ce->next; | |
951 | xfree(ce->s); | |
952 | xfree(ce); | |
7368a6c8 | 953 | } |
7368a6c8 | 954 | } |
955 | ||
956 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
f7342052 | 957 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
7368a6c8 | 958 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
959 | ||
56b3e9ce | 960 | if (s->ttyfd != -1) |
961 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
962 | if (s->term) | |
963 | child_set_env(&env, &envsize, "TERM", s->term); | |
964 | if (s->display) | |
965 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 966 | if (original_command) |
967 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
968 | original_command); | |
7368a6c8 | 969 | |
970 | #ifdef _AIX | |
22d89d24 | 971 | if ((cp = getenv("AUTHSTATE")) != NULL) |
972 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
973 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
974 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
975 | read_environment_file(&env, &envsize, "/etc/environment"); | |
7368a6c8 | 976 | #endif |
7368a6c8 | 977 | #ifdef KRB4 |
ced49be2 | 978 | if (s->authctxt->krb4_ticket_file) |
979 | child_set_env(&env, &envsize, "KRBTKFILE", | |
980 | s->authctxt->krb4_ticket_file); | |
981 | #endif | |
982 | #ifdef KRB5 | |
983 | if (s->authctxt->krb5_ticket_file) | |
984 | child_set_env(&env, &envsize, "KRB5CCNAME", | |
985 | s->authctxt->krb5_ticket_file); | |
986 | #endif | |
7368a6c8 | 987 | #ifdef USE_PAM |
988 | /* Pull in any environment variables that may have been set by PAM. */ | |
760b35a6 | 989 | copy_environment(fetch_pam_environment(), &env, &envsize); |
7368a6c8 | 990 | #endif /* USE_PAM */ |
991 | ||
7368a6c8 | 992 | if (auth_get_socket_name() != NULL) |
993 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, | |
184eed6a | 994 | auth_get_socket_name()); |
7368a6c8 | 995 | |
996 | /* read $HOME/.ssh/environment. */ | |
997 | if (!options.use_login) { | |
71276795 | 998 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
999 | pw->pw_dir); | |
7368a6c8 | 1000 | read_environment_file(&env, &envsize, buf); |
1001 | } | |
1002 | if (debug_flag) { | |
1003 | /* dump the environment */ | |
1004 | fprintf(stderr, "Environment:\n"); | |
1005 | for (i = 0; env[i]; i++) | |
1006 | fprintf(stderr, " %.200s\n", env[i]); | |
1007 | } | |
f7342052 | 1008 | return env; |
1009 | } | |
1010 | ||
1011 | /* | |
1012 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found | |
1013 | * first in this order). | |
1014 | */ | |
1015 | static void | |
1016 | do_rc_files(Session *s, const char *shell) | |
1017 | { | |
1018 | FILE *f = NULL; | |
1019 | char cmd[1024]; | |
1020 | int do_xauth; | |
1021 | struct stat st; | |
1022 | ||
1023 | do_xauth = | |
1024 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
1025 | ||
1026 | /* ignore _PATH_SSH_USER_RC for subsystems */ | |
1027 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
1028 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", | |
1029 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
1030 | if (debug_flag) | |
1031 | fprintf(stderr, "Running %s\n", cmd); | |
1032 | f = popen(cmd, "w"); | |
1033 | if (f) { | |
1034 | if (do_xauth) | |
1035 | fprintf(f, "%s %s\n", s->auth_proto, | |
1036 | s->auth_data); | |
1037 | pclose(f); | |
1038 | } else | |
1039 | fprintf(stderr, "Could not run %s\n", | |
1040 | _PATH_SSH_USER_RC); | |
1041 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { | |
1042 | if (debug_flag) | |
1043 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, | |
1044 | _PATH_SSH_SYSTEM_RC); | |
1045 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); | |
1046 | if (f) { | |
1047 | if (do_xauth) | |
1048 | fprintf(f, "%s %s\n", s->auth_proto, | |
1049 | s->auth_data); | |
1050 | pclose(f); | |
1051 | } else | |
1052 | fprintf(stderr, "Could not run %s\n", | |
1053 | _PATH_SSH_SYSTEM_RC); | |
1054 | } else if (do_xauth && options.xauth_location != NULL) { | |
1055 | /* Add authority data to .Xauthority if appropriate. */ | |
1056 | if (debug_flag) { | |
1057 | fprintf(stderr, | |
1058 | "Running %.100s add " | |
1059 | "%.100s %.100s %.100s\n", | |
1060 | options.xauth_location, s->auth_display, | |
1061 | s->auth_proto, s->auth_data); | |
1062 | } | |
1063 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1064 | options.xauth_location); | |
1065 | f = popen(cmd, "w"); | |
1066 | if (f) { | |
1067 | fprintf(f, "add %s %s %s\n", | |
1068 | s->auth_display, s->auth_proto, | |
1069 | s->auth_data); | |
1070 | pclose(f); | |
1071 | } else { | |
1072 | fprintf(stderr, "Could not run %s\n", | |
1073 | cmd); | |
1074 | } | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | static void | |
1079 | do_nologin(struct passwd *pw) | |
1080 | { | |
1081 | FILE *f = NULL; | |
1082 | char buf[1024]; | |
1083 | ||
1084 | #ifdef HAVE_LOGIN_CAP | |
1085 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
1086 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
1087 | _PATH_NOLOGIN), "r"); | |
1088 | #else | |
1089 | if (pw->pw_uid) | |
1090 | f = fopen(_PATH_NOLOGIN, "r"); | |
1091 | #endif | |
1092 | if (f) { | |
1093 | /* /etc/nologin exists. Print its contents and exit. */ | |
1094 | while (fgets(buf, sizeof(buf), f)) | |
1095 | fputs(buf, stderr); | |
1096 | fclose(f); | |
1097 | exit(254); | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | /* Set login name, uid, gid, and groups. */ | |
1102 | static void | |
1103 | do_setusercontext(struct passwd *pw) | |
1104 | { | |
1105 | #ifdef HAVE_CYGWIN | |
1106 | if (iswinnt) { | |
1107 | #else /* HAVE_CYGWIN */ | |
1108 | if (getuid() == 0 || geteuid() == 0) { | |
1109 | #endif /* HAVE_CYGWIN */ | |
1110 | #ifdef HAVE_GETUSERATTR | |
1111 | set_limits_from_userattr(pw->pw_name); | |
1112 | #endif /* HAVE_GETUSERATTR */ | |
1113 | #ifdef HAVE_LOGIN_CAP | |
1114 | if (setusercontext(lc, pw, pw->pw_uid, | |
1115 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1116 | perror("unable to set user context"); | |
1117 | exit(1); | |
1118 | } | |
1119 | #else | |
1120 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) | |
1121 | /* Sets login uid for accounting */ | |
1122 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1123 | error("setluid: %s", strerror(errno)); | |
1124 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1125 | ||
1126 | if (setlogin(pw->pw_name) < 0) | |
1127 | error("setlogin failed: %s", strerror(errno)); | |
1128 | if (setgid(pw->pw_gid) < 0) { | |
1129 | perror("setgid"); | |
1130 | exit(1); | |
1131 | } | |
1132 | /* Initialize the group list. */ | |
1133 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1134 | perror("initgroups"); | |
1135 | exit(1); | |
1136 | } | |
1137 | endgrent(); | |
1138 | # ifdef USE_PAM | |
1139 | /* | |
1140 | * PAM credentials may take the form of supplementary groups. | |
1141 | * These will have been wiped by the above initgroups() call. | |
1142 | * Reestablish them here. | |
1143 | */ | |
1144 | do_pam_setcred(0); | |
1145 | # endif /* USE_PAM */ | |
1146 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) | |
1147 | irix_setusercontext(pw); | |
1148 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ | |
1149 | #ifdef _AIX | |
1150 | aix_usrinfo(s) | |
1151 | #endif | |
1152 | /* Permanently switch to the desired uid. */ | |
1153 | permanently_set_uid(pw); | |
1154 | #endif | |
1155 | } | |
1156 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) | |
1157 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * Performs common processing for the child, such as setting up the | |
1162 | * environment, closing extra file descriptors, setting the user and group | |
1163 | * ids, and executing the command or shell. | |
1164 | */ | |
1165 | void | |
1166 | do_child(Session *s, const char *command) | |
1167 | { | |
1168 | extern char **environ; | |
1169 | char **env; | |
1170 | char *argv[10]; | |
1171 | const char *shell, *shell0, *hostname = NULL; | |
1172 | struct passwd *pw = s->pw; | |
1173 | u_int i; | |
1174 | ||
1175 | /* remove hostkey from the child's memory */ | |
1176 | destroy_sensitive_data(); | |
1177 | ||
1178 | /* login(1) is only called if we execute the login shell */ | |
1179 | if (options.use_login && command != NULL) | |
1180 | options.use_login = 0; | |
1181 | ||
1182 | /* | |
1183 | * Login(1) does this as well, and it needs uid 0 for the "-h" | |
1184 | * switch, so we let login(1) to this for us. | |
1185 | */ | |
1186 | if (!options.use_login) { | |
1187 | #ifdef HAVE_OSF_SIA | |
1188 | session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty); | |
1189 | if (!check_quietlogin(s, command)) | |
1190 | do_motd(); | |
1191 | #else /* HAVE_OSF_SIA */ | |
1192 | do_nologin(pw); | |
1193 | do_setusercontext(pw); | |
1194 | #endif /* HAVE_OSF_SIA */ | |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * Get the shell from the password data. An empty shell field is | |
1199 | * legal, and means /bin/sh. | |
1200 | */ | |
1201 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
1202 | #ifdef HAVE_LOGIN_CAP | |
1203 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1204 | #endif | |
1205 | ||
1206 | env = do_setup_env(s, shell); | |
1207 | ||
2e73a022 | 1208 | /* we have to stash the hostname before we close our socket. */ |
1209 | if (options.use_login) | |
46e3af7f | 1210 | hostname = get_remote_name_or_ip(utmp_len, |
bf4c5edc | 1211 | options.verify_reverse_mapping); |
7368a6c8 | 1212 | /* |
1213 | * Close the connection descriptors; note that this is the child, and | |
1214 | * the server will still have the socket open, and it is important | |
1215 | * that we do not shutdown it. Note that the descriptors cannot be | |
1216 | * closed before building the environment, as we call | |
1217 | * get_remote_ipaddr there. | |
1218 | */ | |
1219 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1220 | close(packet_get_connection_in()); | |
1221 | else { | |
1222 | close(packet_get_connection_in()); | |
1223 | close(packet_get_connection_out()); | |
1224 | } | |
1225 | /* | |
1226 | * Close all descriptors related to channels. They will still remain | |
1227 | * open in the parent. | |
1228 | */ | |
1229 | /* XXX better use close-on-exec? -markus */ | |
1230 | channel_close_all(); | |
1231 | ||
1232 | /* | |
1233 | * Close any extra file descriptors. Note that there may still be | |
1234 | * descriptors left by system functions. They will be closed later. | |
1235 | */ | |
1236 | endpwent(); | |
1237 | ||
1238 | /* | |
1239 | * Close any extra open file descriptors so that we don\'t have them | |
1240 | * hanging around in clients. Note that we want to do this after | |
1241 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1242 | * descriptors open. | |
1243 | */ | |
1244 | for (i = 3; i < 64; i++) | |
1245 | close(i); | |
1246 | ||
7368a6c8 | 1247 | /* |
2a8a6488 | 1248 | * Must take new environment into use so that .ssh/rc, |
1249 | * /etc/ssh/sshrc and xauth are run in the proper environment. | |
7368a6c8 | 1250 | */ |
1251 | environ = env; | |
1252 | ||
6fcf67f7 | 1253 | #ifdef AFS |
1254 | /* Try to get AFS tokens for the local cell. */ | |
1255 | if (k_hasafs()) { | |
1256 | char cell[64]; | |
184eed6a | 1257 | |
6fcf67f7 | 1258 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) |
1259 | krb_afslog(cell, 0); | |
184eed6a | 1260 | |
6fcf67f7 | 1261 | krb_afslog(0, 0); |
1262 | } | |
1263 | #endif /* AFS */ | |
1264 | ||
dab89049 | 1265 | /* Change current directory to the user\'s home directory. */ |
1266 | if (chdir(pw->pw_dir) < 0) { | |
1267 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", | |
1268 | pw->pw_dir, strerror(errno)); | |
1269 | #ifdef HAVE_LOGIN_CAP | |
1270 | if (login_getcapbool(lc, "requirehome", 0)) | |
1271 | exit(1); | |
1272 | #endif | |
1273 | } | |
1274 | ||
f7342052 | 1275 | if (!options.use_login) |
1276 | do_rc_files(s, shell); | |
1d3c30db | 1277 | |
1278 | /* restore SIGPIPE for child */ | |
1279 | signal(SIGPIPE, SIG_DFL); | |
1280 | ||
f7342052 | 1281 | if (options.use_login) { |
1282 | /* Launch login(1). */ | |
1283 | ||
1284 | execl(LOGIN_PROGRAM, "login", "-h", hostname, | |
1285 | #ifdef LOGIN_NEEDS_TERM | |
1286 | (s->term ? s->term : "unknown"), | |
1287 | #endif /* LOGIN_NEEDS_TERM */ | |
1288 | "-p", "-f", "--", pw->pw_name, (char *)NULL); | |
1289 | ||
1290 | /* Login couldn't be executed, die. */ | |
1291 | ||
1292 | perror("login"); | |
1293 | exit(1); | |
1294 | } | |
1295 | ||
1296 | /* Get the last component of the shell name. */ | |
1297 | if ((shell0 = strrchr(shell, '/')) != NULL) | |
1298 | shell0++; | |
1299 | else | |
1300 | shell0 = shell; | |
1301 | ||
7368a6c8 | 1302 | /* |
1303 | * If we have no command, execute the shell. In this case, the shell | |
1304 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1305 | * this is a login shell. | |
1306 | */ | |
1307 | if (!command) { | |
f7342052 | 1308 | char argv0[256]; |
7368a6c8 | 1309 | |
f7342052 | 1310 | /* Start the shell. Set initial character to '-'. */ |
1311 | argv0[0] = '-'; | |
7368a6c8 | 1312 | |
f7342052 | 1313 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
1314 | >= sizeof(argv0) - 1) { | |
1315 | errno = EINVAL; | |
7368a6c8 | 1316 | perror(shell); |
1317 | exit(1); | |
f7342052 | 1318 | } |
7368a6c8 | 1319 | |
f7342052 | 1320 | /* Execute the shell. */ |
1321 | argv[0] = argv0; | |
1322 | argv[1] = NULL; | |
1323 | execve(shell, argv, env); | |
7368a6c8 | 1324 | |
f7342052 | 1325 | /* Executing the shell failed. */ |
1326 | perror(shell); | |
1327 | exit(1); | |
7368a6c8 | 1328 | } |
1329 | /* | |
1330 | * Execute the command using the user's shell. This uses the -c | |
1331 | * option to execute the command. | |
1332 | */ | |
f7342052 | 1333 | argv[0] = (char *) shell0; |
7368a6c8 | 1334 | argv[1] = "-c"; |
1335 | argv[2] = (char *) command; | |
1336 | argv[3] = NULL; | |
1337 | execve(shell, argv, env); | |
1338 | perror(shell); | |
1339 | exit(1); | |
1340 | } | |
1341 | ||
1342 | Session * | |
1343 | session_new(void) | |
1344 | { | |
1345 | int i; | |
1346 | static int did_init = 0; | |
1347 | if (!did_init) { | |
1348 | debug("session_new: init"); | |
184eed6a | 1349 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1350 | sessions[i].used = 0; |
7368a6c8 | 1351 | } |
1352 | did_init = 1; | |
1353 | } | |
184eed6a | 1354 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1355 | Session *s = &sessions[i]; |
1356 | if (! s->used) { | |
690d0d7f | 1357 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1358 | s->chanid = -1; |
1359 | s->ptyfd = -1; | |
1360 | s->ttyfd = -1; | |
7368a6c8 | 1361 | s->used = 1; |
86066315 | 1362 | s->self = i; |
02323c45 | 1363 | debug("session_new: session %d", i); |
7368a6c8 | 1364 | return s; |
1365 | } | |
1366 | } | |
1367 | return NULL; | |
1368 | } | |
1369 | ||
396c147e | 1370 | static void |
7368a6c8 | 1371 | session_dump(void) |
1372 | { | |
1373 | int i; | |
184eed6a | 1374 | for (i = 0; i < MAX_SESSIONS; i++) { |
7368a6c8 | 1375 | Session *s = &sessions[i]; |
1376 | debug("dump: used %d session %d %p channel %d pid %d", | |
1377 | s->used, | |
1378 | s->self, | |
1379 | s, | |
1380 | s->chanid, | |
1381 | s->pid); | |
1382 | } | |
1383 | } | |
1384 | ||
e78a59f5 | 1385 | int |
57156994 | 1386 | session_open(Authctxt *authctxt, int chanid) |
e78a59f5 | 1387 | { |
1388 | Session *s = session_new(); | |
1389 | debug("session_open: channel %d", chanid); | |
1390 | if (s == NULL) { | |
1391 | error("no more sessions"); | |
1392 | return 0; | |
1393 | } | |
57156994 | 1394 | s->authctxt = authctxt; |
1395 | s->pw = authctxt->pw; | |
e78a59f5 | 1396 | if (s->pw == NULL) |
0725ea77 | 1397 | fatal("no user for session %d", s->self); |
0b242b12 | 1398 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1399 | s->chanid = chanid; | |
e78a59f5 | 1400 | return 1; |
1401 | } | |
1402 | ||
396c147e | 1403 | static Session * |
e78a59f5 | 1404 | session_by_channel(int id) |
1405 | { | |
1406 | int i; | |
184eed6a | 1407 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1408 | Session *s = &sessions[i]; |
1409 | if (s->used && s->chanid == id) { | |
1410 | debug("session_by_channel: session %d channel %d", i, id); | |
1411 | return s; | |
1412 | } | |
1413 | } | |
1414 | debug("session_by_channel: unknown channel %d", id); | |
1415 | session_dump(); | |
1416 | return NULL; | |
1417 | } | |
1418 | ||
396c147e | 1419 | static Session * |
e78a59f5 | 1420 | session_by_pid(pid_t pid) |
1421 | { | |
1422 | int i; | |
1423 | debug("session_by_pid: pid %d", pid); | |
184eed6a | 1424 | for (i = 0; i < MAX_SESSIONS; i++) { |
e78a59f5 | 1425 | Session *s = &sessions[i]; |
1426 | if (s->used && s->pid == pid) | |
1427 | return s; | |
1428 | } | |
1429 | error("session_by_pid: unknown pid %d", pid); | |
1430 | session_dump(); | |
1431 | return NULL; | |
1432 | } | |
1433 | ||
396c147e | 1434 | static int |
e78a59f5 | 1435 | session_window_change_req(Session *s) |
1436 | { | |
1437 | s->col = packet_get_int(); | |
1438 | s->row = packet_get_int(); | |
1439 | s->xpixel = packet_get_int(); | |
1440 | s->ypixel = packet_get_int(); | |
95500969 | 1441 | packet_check_eom(); |
e78a59f5 | 1442 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1443 | return 1; | |
1444 | } | |
1445 | ||
396c147e | 1446 | static int |
e78a59f5 | 1447 | session_pty_req(Session *s) |
1448 | { | |
1e3b8b07 | 1449 | u_int len; |
30dcc918 | 1450 | int n_bytes; |
e78a59f5 | 1451 | |
653d5f86 | 1452 | if (no_pty_flag) { |
1453 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1454 | return 0; |
653d5f86 | 1455 | } |
1456 | if (s->ttyfd != -1) { | |
1457 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1458 | return 0; |
653d5f86 | 1459 | } |
1460 | ||
e78a59f5 | 1461 | s->term = packet_get_string(&len); |
653d5f86 | 1462 | |
1463 | if (compat20) { | |
1464 | s->col = packet_get_int(); | |
1465 | s->row = packet_get_int(); | |
1466 | } else { | |
1467 | s->row = packet_get_int(); | |
1468 | s->col = packet_get_int(); | |
1469 | } | |
e78a59f5 | 1470 | s->xpixel = packet_get_int(); |
1471 | s->ypixel = packet_get_int(); | |
1472 | ||
1473 | if (strcmp(s->term, "") == 0) { | |
1474 | xfree(s->term); | |
1475 | s->term = NULL; | |
1476 | } | |
653d5f86 | 1477 | |
e78a59f5 | 1478 | /* Allocate a pty and open it. */ |
653d5f86 | 1479 | debug("Allocating pty."); |
e78a59f5 | 1480 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) { |
653d5f86 | 1481 | if (s->term) |
1482 | xfree(s->term); | |
e78a59f5 | 1483 | s->term = NULL; |
1484 | s->ptyfd = -1; | |
1485 | s->ttyfd = -1; | |
1486 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1487 | return 0; |
e78a59f5 | 1488 | } |
1489 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1490 | |
1491 | /* for SSH1 the tty modes length is not given */ | |
1492 | if (!compat20) | |
1493 | n_bytes = packet_remaining(); | |
1494 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1495 | ||
e78a59f5 | 1496 | /* |
1497 | * Add a cleanup function to clear the utmp entry and record logout | |
1498 | * time in case we call fatal() (e.g., the connection gets closed). | |
1499 | */ | |
86066315 | 1500 | fatal_add_cleanup(session_pty_cleanup, (void *)s); |
e78a59f5 | 1501 | pty_setowner(s->pw, s->tty); |
653d5f86 | 1502 | |
1503 | /* Set window size from the packet. */ | |
e78a59f5 | 1504 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1505 | ||
95500969 | 1506 | packet_check_eom(); |
1d1ffb87 | 1507 | session_proctitle(s); |
e78a59f5 | 1508 | return 1; |
1509 | } | |
1510 | ||
396c147e | 1511 | static int |
0b242b12 | 1512 | session_subsystem_req(Session *s) |
1513 | { | |
01855277 | 1514 | struct stat st; |
1e3b8b07 | 1515 | u_int len; |
0b242b12 | 1516 | int success = 0; |
01855277 | 1517 | char *cmd, *subsys = packet_get_string(&len); |
38c295d6 | 1518 | int i; |
0b242b12 | 1519 | |
95500969 | 1520 | packet_check_eom(); |
8875ca97 | 1521 | log("subsystem request for %.100s", subsys); |
0b242b12 | 1522 | |
38c295d6 | 1523 | for (i = 0; i < options.num_subsystems; i++) { |
01855277 | 1524 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
1525 | cmd = options.subsystem_command[i]; | |
1526 | if (stat(cmd, &st) < 0) { | |
1527 | error("subsystem: cannot stat %s: %s", cmd, | |
1528 | strerror(errno)); | |
1529 | break; | |
1530 | } | |
1531 | debug("subsystem: exec() %s", cmd); | |
e5d7a405 | 1532 | s->is_subsystem = 1; |
01855277 | 1533 | do_exec(s, cmd); |
38c295d6 | 1534 | success = 1; |
24932ee9 | 1535 | break; |
38c295d6 | 1536 | } |
1537 | } | |
1538 | ||
1539 | if (!success) | |
8875ca97 | 1540 | log("subsystem request for %.100s failed, subsystem not found", |
01855277 | 1541 | subsys); |
38c295d6 | 1542 | |
0b242b12 | 1543 | xfree(subsys); |
1544 | return success; | |
1545 | } | |
1546 | ||
396c147e | 1547 | static int |
0b242b12 | 1548 | session_x11_req(Session *s) |
1549 | { | |
8dcd9d5c | 1550 | int success; |
0b242b12 | 1551 | |
1552 | s->single_connection = packet_get_char(); | |
1553 | s->auth_proto = packet_get_string(NULL); | |
1554 | s->auth_data = packet_get_string(NULL); | |
1555 | s->screen = packet_get_int(); | |
95500969 | 1556 | packet_check_eom(); |
0b242b12 | 1557 | |
8dcd9d5c | 1558 | success = session_setup_x11fwd(s); |
1559 | if (!success) { | |
0b242b12 | 1560 | xfree(s->auth_proto); |
1561 | xfree(s->auth_data); | |
1500bcdd | 1562 | s->auth_proto = NULL; |
1563 | s->auth_data = NULL; | |
0b242b12 | 1564 | } |
8dcd9d5c | 1565 | return success; |
0b242b12 | 1566 | } |
1567 | ||
396c147e | 1568 | static int |
38c295d6 | 1569 | session_shell_req(Session *s) |
1570 | { | |
95500969 | 1571 | packet_check_eom(); |
dac6753b | 1572 | do_exec(s, NULL); |
38c295d6 | 1573 | return 1; |
1574 | } | |
1575 | ||
396c147e | 1576 | static int |
38c295d6 | 1577 | session_exec_req(Session *s) |
1578 | { | |
1e3b8b07 | 1579 | u_int len; |
38c295d6 | 1580 | char *command = packet_get_string(&len); |
95500969 | 1581 | packet_check_eom(); |
dac6753b | 1582 | do_exec(s, command); |
c95add71 | 1583 | xfree(command); |
38c295d6 | 1584 | return 1; |
1585 | } | |
1586 | ||
396c147e | 1587 | static int |
fa08c86b | 1588 | session_auth_agent_req(Session *s) |
1589 | { | |
1590 | static int called = 0; | |
95500969 | 1591 | packet_check_eom(); |
d343d900 | 1592 | if (no_agent_forwarding_flag) { |
1593 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1594 | return 0; | |
1595 | } | |
fa08c86b | 1596 | if (called) { |
1597 | return 0; | |
1598 | } else { | |
1599 | called = 1; | |
1600 | return auth_input_request_forwarding(s->pw); | |
1601 | } | |
1602 | } | |
1603 | ||
7899c98f | 1604 | int |
1605 | session_input_channel_req(Channel *c, const char *rtype) | |
e78a59f5 | 1606 | { |
e78a59f5 | 1607 | int success = 0; |
e78a59f5 | 1608 | Session *s; |
e78a59f5 | 1609 | |
7899c98f | 1610 | if ((s = session_by_channel(c->self)) == NULL) { |
1611 | log("session_input_channel_req: no session %d req %.100s", | |
1612 | c->self, rtype); | |
1613 | return 0; | |
1614 | } | |
1615 | debug("session_input_channel_req: session %d req %s", s->self, rtype); | |
e78a59f5 | 1616 | |
1617 | /* | |
e5d7a405 | 1618 | * a session is in LARVAL state until a shell, a command |
1619 | * or a subsystem is executed | |
e78a59f5 | 1620 | */ |
1621 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1622 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1623 | success = session_shell_req(s); |
e78a59f5 | 1624 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1625 | success = session_exec_req(s); |
e78a59f5 | 1626 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1627 | success = session_pty_req(s); |
0b242b12 | 1628 | } else if (strcmp(rtype, "x11-req") == 0) { |
1629 | success = session_x11_req(s); | |
fa08c86b | 1630 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1631 | success = session_auth_agent_req(s); | |
0b242b12 | 1632 | } else if (strcmp(rtype, "subsystem") == 0) { |
1633 | success = session_subsystem_req(s); | |
e78a59f5 | 1634 | } |
1635 | } | |
1636 | if (strcmp(rtype, "window-change") == 0) { | |
1637 | success = session_window_change_req(s); | |
1638 | } | |
7899c98f | 1639 | return success; |
e78a59f5 | 1640 | } |
1641 | ||
1642 | void | |
1643 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1644 | { | |
1645 | if (!compat20) | |
1646 | fatal("session_set_fds: called for proto != 2.0"); | |
1647 | /* | |
1648 | * now that have a child and a pipe to the child, | |
1649 | * we can activate our channel and register the fd's | |
1650 | */ | |
1651 | if (s->chanid == -1) | |
1652 | fatal("no channel for session %d", s->self); | |
1653 | channel_set_fds(s->chanid, | |
1654 | fdout, fdin, fderr, | |
a22aff1f | 1655 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
ea9700ba | 1656 | 1, |
1657 | CHAN_SES_WINDOW_DEFAULT); | |
e78a59f5 | 1658 | } |
1659 | ||
86066315 | 1660 | /* |
1661 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
1662 | * (e.g., due to a dropped connection). | |
1663 | */ | |
396c147e | 1664 | static void |
86066315 | 1665 | session_pty_cleanup(void *session) |
7368a6c8 | 1666 | { |
86066315 | 1667 | Session *s = session; |
1668 | ||
1669 | if (s == NULL) { | |
1670 | error("session_pty_cleanup: no session"); | |
1671 | return; | |
1672 | } | |
1673 | if (s->ttyfd == -1) | |
7368a6c8 | 1674 | return; |
1675 | ||
0725ea77 | 1676 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 1677 | |
7368a6c8 | 1678 | /* Record that the user has logged out. */ |
86066315 | 1679 | if (s->pid != 0) |
1680 | record_logout(s->pid, s->tty); | |
7368a6c8 | 1681 | |
1682 | /* Release the pseudo-tty. */ | |
1683 | pty_release(s->tty); | |
1684 | ||
1685 | /* | |
1686 | * Close the server side of the socket pairs. We must do this after | |
1687 | * the pty cleanup, so that another process doesn't get this pty | |
1688 | * while we're still cleaning up. | |
1689 | */ | |
1690 | if (close(s->ptymaster) < 0) | |
1691 | error("close(s->ptymaster): %s", strerror(errno)); | |
efcc9957 | 1692 | |
1693 | /* unlink pty from session */ | |
1694 | s->ttyfd = -1; | |
7368a6c8 | 1695 | } |
e78a59f5 | 1696 | |
396c147e | 1697 | static void |
e78a59f5 | 1698 | session_exit_message(Session *s, int status) |
1699 | { | |
1700 | Channel *c; | |
5a4ae906 | 1701 | |
1702 | if ((c = channel_lookup(s->chanid)) == NULL) | |
86066315 | 1703 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 1704 | s->self, s->chanid); |
1705 | debug("session_exit_message: session %d channel %d pid %d", | |
1706 | s->self, s->chanid, s->pid); | |
1707 | ||
1708 | if (WIFEXITED(status)) { | |
5a4ae906 | 1709 | channel_request_start(s->chanid, "exit-status", 0); |
e78a59f5 | 1710 | packet_put_int(WEXITSTATUS(status)); |
1711 | packet_send(); | |
1712 | } else if (WIFSIGNALED(status)) { | |
5a4ae906 | 1713 | channel_request_start(s->chanid, "exit-signal", 0); |
e78a59f5 | 1714 | packet_put_int(WTERMSIG(status)); |
a64009ad | 1715 | #ifdef WCOREDUMP |
e78a59f5 | 1716 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1717 | #else /* WCOREDUMP */ |
1718 | packet_put_char(0); | |
1719 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1720 | packet_put_cstring(""); |
1721 | packet_put_cstring(""); | |
1722 | packet_send(); | |
1723 | } else { | |
1724 | /* Some weird exit cause. Just exit. */ | |
1725 | packet_disconnect("wait returned status %04x.", status); | |
1726 | } | |
1727 | ||
1728 | /* disconnect channel */ | |
1729 | debug("session_exit_message: release channel %d", s->chanid); | |
1730 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1731 | /* |
1732 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1733 | * interested in data we write. | |
1734 | * Note that we must not call 'chan_read_failed', since there could | |
1735 | * be some more data waiting in the pipe. | |
1736 | */ | |
0b242b12 | 1737 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1738 | chan_write_failed(c); | |
e78a59f5 | 1739 | s->chanid = -1; |
1740 | } | |
1741 | ||
396c147e | 1742 | static void |
86066315 | 1743 | session_close(Session *s) |
e78a59f5 | 1744 | { |
86066315 | 1745 | debug("session_close: session %d pid %d", s->self, s->pid); |
1746 | if (s->ttyfd != -1) { | |
1747 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
1748 | session_pty_cleanup(s); | |
1749 | } | |
e78a59f5 | 1750 | if (s->term) |
1751 | xfree(s->term); | |
1752 | if (s->display) | |
1753 | xfree(s->display); | |
f9314d9a | 1754 | if (s->auth_display) |
1755 | xfree(s->auth_display); | |
e78a59f5 | 1756 | if (s->auth_data) |
1757 | xfree(s->auth_data); | |
1758 | if (s->auth_proto) | |
1759 | xfree(s->auth_proto); | |
1760 | s->used = 0; | |
1d1ffb87 | 1761 | session_proctitle(s); |
e78a59f5 | 1762 | } |
1763 | ||
1764 | void | |
1765 | session_close_by_pid(pid_t pid, int status) | |
1766 | { | |
1767 | Session *s = session_by_pid(pid); | |
1768 | if (s == NULL) { | |
eb26141e | 1769 | debug("session_close_by_pid: no session for pid %d", pid); |
e78a59f5 | 1770 | return; |
1771 | } | |
1772 | if (s->chanid != -1) | |
1773 | session_exit_message(s, status); | |
1774 | session_close(s); | |
1775 | } | |
1776 | ||
1777 | /* | |
1778 | * this is called when a channel dies before | |
1779 | * the session 'child' itself dies | |
1780 | */ | |
1781 | void | |
1782 | session_close_by_channel(int id, void *arg) | |
1783 | { | |
1784 | Session *s = session_by_channel(id); | |
1785 | if (s == NULL) { | |
418e724c | 1786 | debug("session_close_by_channel: no session for id %d", id); |
e78a59f5 | 1787 | return; |
1788 | } | |
418e724c | 1789 | debug("session_close_by_channel: channel %d child %d", id, s->pid); |
d5f24f94 | 1790 | if (s->pid != 0) { |
418e724c | 1791 | debug("session_close_by_channel: channel %d: has child", id); |
efcc9957 | 1792 | /* |
1793 | * delay detach of session, but release pty, since | |
1794 | * the fd's to the child are already closed | |
1795 | */ | |
1796 | if (s->ttyfd != -1) { | |
1797 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
1798 | session_pty_cleanup(s); | |
1799 | } | |
418e724c | 1800 | return; |
e78a59f5 | 1801 | } |
418e724c | 1802 | /* detach by removing callback */ |
1803 | channel_cancel_cleanup(s->chanid); | |
1804 | s->chanid = -1; | |
d5f24f94 | 1805 | session_close(s); |
1806 | } | |
1807 | ||
1808 | void | |
418e724c | 1809 | session_destroy_all(void) |
d5f24f94 | 1810 | { |
1811 | int i; | |
184eed6a | 1812 | for (i = 0; i < MAX_SESSIONS; i++) { |
d5f24f94 | 1813 | Session *s = &sessions[i]; |
184eed6a | 1814 | if (s->used) |
d5f24f94 | 1815 | session_close(s); |
d5f24f94 | 1816 | } |
e78a59f5 | 1817 | } |
1818 | ||
396c147e | 1819 | static char * |
1d1ffb87 | 1820 | session_tty_list(void) |
1821 | { | |
1822 | static char buf[1024]; | |
1823 | int i; | |
1824 | buf[0] = '\0'; | |
184eed6a | 1825 | for (i = 0; i < MAX_SESSIONS; i++) { |
1d1ffb87 | 1826 | Session *s = &sessions[i]; |
1827 | if (s->used && s->ttyfd != -1) { | |
1828 | if (buf[0] != '\0') | |
1829 | strlcat(buf, ",", sizeof buf); | |
1830 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1831 | } | |
1832 | } | |
1833 | if (buf[0] == '\0') | |
1834 | strlcpy(buf, "notty", sizeof buf); | |
1835 | return buf; | |
1836 | } | |
1837 | ||
1838 | void | |
1839 | session_proctitle(Session *s) | |
1840 | { | |
1841 | if (s->pw == NULL) | |
1842 | error("no user for session %d", s->self); | |
1843 | else | |
1844 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
1845 | } | |
1846 | ||
8dcd9d5c | 1847 | int |
1848 | session_setup_x11fwd(Session *s) | |
1849 | { | |
8dcd9d5c | 1850 | struct stat st; |
c9d0ad9b | 1851 | char display[512], auth_display[512]; |
1852 | char hostname[MAXHOSTNAMELEN]; | |
8dcd9d5c | 1853 | |
1854 | if (no_x11_forwarding_flag) { | |
1855 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
1856 | return 0; | |
1857 | } | |
1858 | if (!options.x11_forwarding) { | |
1859 | debug("X11 forwarding disabled in server configuration file."); | |
1860 | return 0; | |
1861 | } | |
1862 | if (!options.xauth_location || | |
1863 | (stat(options.xauth_location, &st) == -1)) { | |
1864 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
1865 | return 0; | |
1866 | } | |
ff027d84 | 1867 | if (options.use_login) { |
1868 | packet_send_debug("X11 forwarding disabled; " | |
1869 | "not compatible with UseLogin=yes."); | |
1870 | return 0; | |
1871 | } | |
b44de2b1 | 1872 | if (s->display != NULL) { |
8dcd9d5c | 1873 | debug("X11 display already set."); |
1874 | return 0; | |
1875 | } | |
c9d0ad9b | 1876 | s->display_number = x11_create_display_inet(options.x11_display_offset, |
e6e573bd | 1877 | options.x11_use_localhost, s->single_connection); |
c9d0ad9b | 1878 | if (s->display_number == -1) { |
b44de2b1 | 1879 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 1880 | return 0; |
1881 | } | |
c9d0ad9b | 1882 | |
1883 | /* Set up a suitable value for the DISPLAY variable. */ | |
1884 | if (gethostname(hostname, sizeof(hostname)) < 0) | |
1885 | fatal("gethostname: %.100s", strerror(errno)); | |
1886 | /* | |
1887 | * auth_display must be used as the displayname when the | |
1888 | * authorization entry is added with xauth(1). This will be | |
1889 | * different than the DISPLAY string for localhost displays. | |
1890 | */ | |
e6e573bd | 1891 | if (options.x11_use_localhost) { |
c9d0ad9b | 1892 | snprintf(display, sizeof display, "localhost:%d.%d", |
1893 | s->display_number, s->screen); | |
f9314d9a | 1894 | snprintf(auth_display, sizeof auth_display, "unix:%d.%d", |
1895 | s->display_number, s->screen); | |
c9d0ad9b | 1896 | s->display = xstrdup(display); |
f9314d9a | 1897 | s->auth_display = xstrdup(auth_display); |
c9d0ad9b | 1898 | } else { |
1899 | #ifdef IPADDR_IN_DISPLAY | |
1900 | struct hostent *he; | |
1901 | struct in_addr my_addr; | |
1902 | ||
1903 | he = gethostbyname(hostname); | |
1904 | if (he == NULL) { | |
1905 | error("Can't get IP address for X11 DISPLAY."); | |
1906 | packet_send_debug("Can't get IP address for X11 DISPLAY."); | |
1907 | return 0; | |
1908 | } | |
1909 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); | |
1910 | snprintf(display, sizeof display, "%.50s:%d.%d", inet_ntoa(my_addr), | |
1911 | s->display_number, s->screen); | |
1912 | #else | |
1913 | snprintf(display, sizeof display, "%.400s:%d.%d", hostname, | |
1914 | s->display_number, s->screen); | |
1915 | #endif | |
1916 | s->display = xstrdup(display); | |
f9314d9a | 1917 | s->auth_display = xstrdup(display); |
c9d0ad9b | 1918 | } |
1919 | ||
8dcd9d5c | 1920 | return 1; |
1921 | } | |
1922 | ||
396c147e | 1923 | static void |
59c97189 | 1924 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 1925 | { |
57156994 | 1926 | server_loop2(authctxt); |
e78a59f5 | 1927 | } |