session.c revision 124211
1/* 2 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 3 * All rights reserved 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 * 11 * SSH2 support by Markus Friedl. 12 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. 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. 33 */ 34 35#include "includes.h" 36RCSID("$OpenBSD: session.c,v 1.164 2003/09/18 08:49:45 markus Exp $"); 37RCSID("$FreeBSD: head/crypto/openssh/session.c 124211 2004-01-07 11:16:27Z des $"); 38 39#include "ssh.h" 40#include "ssh1.h" 41#include "ssh2.h" 42#include "xmalloc.h" 43#include "sshpty.h" 44#include "packet.h" 45#include "buffer.h" 46#include "mpaux.h" 47#include "uidswap.h" 48#include "compat.h" 49#include "channels.h" 50#include "bufaux.h" 51#include "auth.h" 52#include "auth-options.h" 53#include "pathnames.h" 54#include "log.h" 55#include "servconf.h" 56#include "sshlogin.h" 57#include "serverloop.h" 58#include "canohost.h" 59#include "session.h" 60#include "monitor_wrap.h" 61 62#ifdef GSSAPI 63#include "ssh-gss.h" 64#endif 65 66/* func */ 67 68Session *session_new(void); 69void session_set_fds(Session *, int, int, int); 70void session_pty_cleanup(void *); 71void session_proctitle(Session *); 72int session_setup_x11fwd(Session *); 73void do_exec_pty(Session *, const char *); 74void do_exec_no_pty(Session *, const char *); 75void do_exec(Session *, const char *); 76void do_login(Session *, const char *); 77#ifdef LOGIN_NEEDS_UTMPX 78static void do_pre_login(Session *s); 79#endif 80void do_child(Session *, const char *); 81void do_motd(void); 82int check_quietlogin(Session *, const char *); 83 84static void do_authenticated1(Authctxt *); 85static void do_authenticated2(Authctxt *); 86 87static int session_pty_req(Session *); 88 89/* import */ 90extern ServerOptions options; 91extern char *__progname; 92extern int log_stderr; 93extern int debug_flag; 94extern u_int utmp_len; 95extern int startup_pipe; 96extern void destroy_sensitive_data(void); 97extern Buffer loginmsg; 98 99/* original command from peer. */ 100const char *original_command = NULL; 101 102/* data */ 103#define MAX_SESSIONS 10 104Session sessions[MAX_SESSIONS]; 105 106#ifdef HAVE_LOGIN_CAP 107login_cap_t *lc; 108#endif 109 110/* Name and directory of socket for authentication agent forwarding. */ 111static char *auth_sock_name = NULL; 112static char *auth_sock_dir = NULL; 113 114/* removes the agent forwarding socket */ 115 116static void 117auth_sock_cleanup_proc(void *_pw) 118{ 119 struct passwd *pw = _pw; 120 121 if (auth_sock_name != NULL) { 122 temporarily_use_uid(pw); 123 unlink(auth_sock_name); 124 rmdir(auth_sock_dir); 125 auth_sock_name = NULL; 126 restore_uid(); 127 } 128} 129 130static int 131auth_input_request_forwarding(struct passwd * pw) 132{ 133 Channel *nc; 134 int sock; 135 struct sockaddr_un sunaddr; 136 137 if (auth_sock_name != NULL) { 138 error("authentication forwarding requested twice."); 139 return 0; 140 } 141 142 /* Temporarily drop privileged uid for mkdir/bind. */ 143 temporarily_use_uid(pw); 144 145 /* Allocate a buffer for the socket name, and format the name. */ 146 auth_sock_name = xmalloc(MAXPATHLEN); 147 auth_sock_dir = xmalloc(MAXPATHLEN); 148 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); 149 150 /* Create private directory for socket */ 151 if (mkdtemp(auth_sock_dir) == NULL) { 152 packet_send_debug("Agent forwarding disabled: " 153 "mkdtemp() failed: %.100s", strerror(errno)); 154 restore_uid(); 155 xfree(auth_sock_name); 156 xfree(auth_sock_dir); 157 auth_sock_name = NULL; 158 auth_sock_dir = NULL; 159 return 0; 160 } 161 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", 162 auth_sock_dir, (long) getpid()); 163 164 /* delete agent socket on fatal() */ 165 fatal_add_cleanup(auth_sock_cleanup_proc, pw); 166 167 /* Create the socket. */ 168 sock = socket(AF_UNIX, SOCK_STREAM, 0); 169 if (sock < 0) 170 packet_disconnect("socket: %.100s", strerror(errno)); 171 172 /* Bind it to the name. */ 173 memset(&sunaddr, 0, sizeof(sunaddr)); 174 sunaddr.sun_family = AF_UNIX; 175 strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); 176 177 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) 178 packet_disconnect("bind: %.100s", strerror(errno)); 179 180 /* Restore the privileged uid. */ 181 restore_uid(); 182 183 /* Start listening on the socket. */ 184 if (listen(sock, 5) < 0) 185 packet_disconnect("listen: %.100s", strerror(errno)); 186 187 /* Allocate a channel for the authentication agent socket. */ 188 nc = channel_new("auth socket", 189 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, 190 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 191 0, "auth socket", 1); 192 strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); 193 return 1; 194} 195 196 197void 198do_authenticated(Authctxt *authctxt) 199{ 200 setproctitle("%s", authctxt->pw->pw_name); 201 202 /* 203 * Cancel the alarm we set to limit the time taken for 204 * authentication. 205 */ 206 alarm(0); 207 if (startup_pipe != -1) { 208 close(startup_pipe); 209 startup_pipe = -1; 210 } 211 212 /* setup the channel layer */ 213 if (!no_port_forwarding_flag && options.allow_tcp_forwarding) 214 channel_permit_all_opens(); 215 216 if (compat20) 217 do_authenticated2(authctxt); 218 else 219 do_authenticated1(authctxt); 220 221 /* remove agent socket */ 222 if (auth_sock_name != NULL) 223 auth_sock_cleanup_proc(authctxt->pw); 224#ifdef KRB5 225 if (options.kerberos_ticket_cleanup) 226 krb5_cleanup_proc(authctxt); 227#endif 228} 229 230/* 231 * Prepares for an interactive session. This is called after the user has 232 * been successfully authenticated. During this message exchange, pseudo 233 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings 234 * are requested, etc. 235 */ 236static void 237do_authenticated1(Authctxt *authctxt) 238{ 239 Session *s; 240 char *command; 241 int success, type, screen_flag; 242 int enable_compression_after_reply = 0; 243 u_int proto_len, data_len, dlen, compression_level = 0; 244 245 s = session_new(); 246 s->authctxt = authctxt; 247 s->pw = authctxt->pw; 248 249 /* 250 * We stay in this loop until the client requests to execute a shell 251 * or a command. 252 */ 253 for (;;) { 254 success = 0; 255 256 /* Get a packet from the client. */ 257 type = packet_read(); 258 259 /* Process the packet. */ 260 switch (type) { 261 case SSH_CMSG_REQUEST_COMPRESSION: 262 compression_level = packet_get_int(); 263 packet_check_eom(); 264 if (compression_level < 1 || compression_level > 9) { 265 packet_send_debug("Received illegal compression level %d.", 266 compression_level); 267 break; 268 } 269 if (!options.compression) { 270 debug2("compression disabled"); 271 break; 272 } 273 /* Enable compression after we have responded with SUCCESS. */ 274 enable_compression_after_reply = 1; 275 success = 1; 276 break; 277 278 case SSH_CMSG_REQUEST_PTY: 279 success = session_pty_req(s); 280 break; 281 282 case SSH_CMSG_X11_REQUEST_FORWARDING: 283 s->auth_proto = packet_get_string(&proto_len); 284 s->auth_data = packet_get_string(&data_len); 285 286 screen_flag = packet_get_protocol_flags() & 287 SSH_PROTOFLAG_SCREEN_NUMBER; 288 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); 289 290 if (packet_remaining() == 4) { 291 if (!screen_flag) 292 debug2("Buggy client: " 293 "X11 screen flag missing"); 294 s->screen = packet_get_int(); 295 } else { 296 s->screen = 0; 297 } 298 packet_check_eom(); 299 success = session_setup_x11fwd(s); 300 if (!success) { 301 xfree(s->auth_proto); 302 xfree(s->auth_data); 303 s->auth_proto = NULL; 304 s->auth_data = NULL; 305 } 306 break; 307 308 case SSH_CMSG_AGENT_REQUEST_FORWARDING: 309 if (no_agent_forwarding_flag || compat13) { 310 debug("Authentication agent forwarding not permitted for this authentication."); 311 break; 312 } 313 debug("Received authentication agent forwarding request."); 314 success = auth_input_request_forwarding(s->pw); 315 break; 316 317 case SSH_CMSG_PORT_FORWARD_REQUEST: 318 if (no_port_forwarding_flag) { 319 debug("Port forwarding not permitted for this authentication."); 320 break; 321 } 322 if (!options.allow_tcp_forwarding) { 323 debug("Port forwarding not permitted."); 324 break; 325 } 326 debug("Received TCP/IP port forwarding request."); 327 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); 328 success = 1; 329 break; 330 331 case SSH_CMSG_MAX_PACKET_SIZE: 332 if (packet_set_maxsize(packet_get_int()) > 0) 333 success = 1; 334 break; 335 336 case SSH_CMSG_EXEC_SHELL: 337 case SSH_CMSG_EXEC_CMD: 338 if (type == SSH_CMSG_EXEC_CMD) { 339 command = packet_get_string(&dlen); 340 debug("Exec command '%.500s'", command); 341 do_exec(s, command); 342 xfree(command); 343 } else { 344 do_exec(s, NULL); 345 } 346 packet_check_eom(); 347 session_close(s); 348 return; 349 350 default: 351 /* 352 * Any unknown messages in this phase are ignored, 353 * and a failure message is returned. 354 */ 355 logit("Unknown packet type received after authentication: %d", type); 356 } 357 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); 358 packet_send(); 359 packet_write_wait(); 360 361 /* Enable compression now that we have replied if appropriate. */ 362 if (enable_compression_after_reply) { 363 enable_compression_after_reply = 0; 364 packet_start_compression(compression_level); 365 } 366 } 367} 368 369/* 370 * This is called to fork and execute a command when we have no tty. This 371 * will call do_child from the child, and server_loop from the parent after 372 * setting up file descriptors and such. 373 */ 374void 375do_exec_no_pty(Session *s, const char *command) 376{ 377 pid_t pid; 378 379#ifdef USE_PIPES 380 int pin[2], pout[2], perr[2]; 381 /* Allocate pipes for communicating with the program. */ 382 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) 383 packet_disconnect("Could not create pipes: %.100s", 384 strerror(errno)); 385#else /* USE_PIPES */ 386 int inout[2], err[2]; 387 /* Uses socket pairs to communicate with the program. */ 388 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || 389 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) 390 packet_disconnect("Could not create socket pairs: %.100s", 391 strerror(errno)); 392#endif /* USE_PIPES */ 393 if (s == NULL) 394 fatal("do_exec_no_pty: no session"); 395 396 session_proctitle(s); 397 398#if defined(USE_PAM) 399 if (options.use_pam) { 400 do_pam_setcred(1); 401 if (is_pam_password_change_required()) 402 packet_disconnect("Password change required but no " 403 "TTY available"); 404 } 405#endif /* USE_PAM */ 406 407 /* Fork the child. */ 408 if ((pid = fork()) == 0) { 409 fatal_remove_all_cleanups(); 410 411 /* Child. Reinitialize the log since the pid has changed. */ 412 log_init(__progname, options.log_level, options.log_facility, log_stderr); 413 414 /* 415 * Create a new session and process group since the 4.4BSD 416 * setlogin() affects the entire process group. 417 */ 418 if (setsid() < 0) 419 error("setsid failed: %.100s", strerror(errno)); 420 421#ifdef USE_PIPES 422 /* 423 * Redirect stdin. We close the parent side of the socket 424 * pair, and make the child side the standard input. 425 */ 426 close(pin[1]); 427 if (dup2(pin[0], 0) < 0) 428 perror("dup2 stdin"); 429 close(pin[0]); 430 431 /* Redirect stdout. */ 432 close(pout[0]); 433 if (dup2(pout[1], 1) < 0) 434 perror("dup2 stdout"); 435 close(pout[1]); 436 437 /* Redirect stderr. */ 438 close(perr[0]); 439 if (dup2(perr[1], 2) < 0) 440 perror("dup2 stderr"); 441 close(perr[1]); 442#else /* USE_PIPES */ 443 /* 444 * Redirect stdin, stdout, and stderr. Stdin and stdout will 445 * use the same socket, as some programs (particularly rdist) 446 * seem to depend on it. 447 */ 448 close(inout[1]); 449 close(err[1]); 450 if (dup2(inout[0], 0) < 0) /* stdin */ 451 perror("dup2 stdin"); 452 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ 453 perror("dup2 stdout"); 454 if (dup2(err[0], 2) < 0) /* stderr */ 455 perror("dup2 stderr"); 456#endif /* USE_PIPES */ 457 458#ifdef _UNICOS 459 cray_init_job(s->pw); /* set up cray jid and tmpdir */ 460#endif 461 462 /* Do processing for the child (exec command etc). */ 463 do_child(s, command); 464 /* NOTREACHED */ 465 } 466#ifdef _UNICOS 467 signal(WJSIGNAL, cray_job_termination_handler); 468#endif /* _UNICOS */ 469#ifdef HAVE_CYGWIN 470 if (is_winnt) 471 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); 472#endif 473 if (pid < 0) 474 packet_disconnect("fork failed: %.100s", strerror(errno)); 475 s->pid = pid; 476 /* Set interactive/non-interactive mode. */ 477 packet_set_interactive(s->display != NULL); 478#ifdef USE_PIPES 479 /* We are the parent. Close the child sides of the pipes. */ 480 close(pin[0]); 481 close(pout[1]); 482 close(perr[1]); 483 484 if (compat20) { 485 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); 486 } else { 487 /* Enter the interactive session. */ 488 server_loop(pid, pin[1], pout[0], perr[0]); 489 /* server_loop has closed pin[1], pout[0], and perr[0]. */ 490 } 491#else /* USE_PIPES */ 492 /* We are the parent. Close the child sides of the socket pairs. */ 493 close(inout[0]); 494 close(err[0]); 495 496 /* 497 * Enter the interactive session. Note: server_loop must be able to 498 * handle the case that fdin and fdout are the same. 499 */ 500 if (compat20) { 501 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); 502 } else { 503 server_loop(pid, inout[1], inout[1], err[1]); 504 /* server_loop has closed inout[1] and err[1]. */ 505 } 506#endif /* USE_PIPES */ 507} 508 509/* 510 * This is called to fork and execute a command when we have a tty. This 511 * will call do_child from the child, and server_loop from the parent after 512 * setting up file descriptors, controlling tty, updating wtmp, utmp, 513 * lastlog, and other such operations. 514 */ 515void 516do_exec_pty(Session *s, const char *command) 517{ 518 int fdout, ptyfd, ttyfd, ptymaster; 519 pid_t pid; 520 521 if (s == NULL) 522 fatal("do_exec_pty: no session"); 523 ptyfd = s->ptyfd; 524 ttyfd = s->ttyfd; 525 526#if defined(USE_PAM) 527 if (options.use_pam) { 528 do_pam_set_tty(s->tty); 529 do_pam_setcred(1); 530 } 531#endif 532 533 /* Fork the child. */ 534 if ((pid = fork()) == 0) { 535 fatal_remove_all_cleanups(); 536 537 /* Child. Reinitialize the log because the pid has changed. */ 538 log_init(__progname, options.log_level, options.log_facility, log_stderr); 539 /* Close the master side of the pseudo tty. */ 540 close(ptyfd); 541 542 /* Make the pseudo tty our controlling tty. */ 543 pty_make_controlling_tty(&ttyfd, s->tty); 544 545 /* Redirect stdin/stdout/stderr from the pseudo tty. */ 546 if (dup2(ttyfd, 0) < 0) 547 error("dup2 stdin: %s", strerror(errno)); 548 if (dup2(ttyfd, 1) < 0) 549 error("dup2 stdout: %s", strerror(errno)); 550 if (dup2(ttyfd, 2) < 0) 551 error("dup2 stderr: %s", strerror(errno)); 552 553 /* Close the extra descriptor for the pseudo tty. */ 554 close(ttyfd); 555 556 /* record login, etc. similar to login(1) */ 557#ifndef HAVE_OSF_SIA 558 if (!(options.use_login && command == NULL)) { 559#ifdef _UNICOS 560 cray_init_job(s->pw); /* set up cray jid and tmpdir */ 561#endif /* _UNICOS */ 562 do_login(s, command); 563 } 564# ifdef LOGIN_NEEDS_UTMPX 565 else 566 do_pre_login(s); 567# endif 568#endif 569 570 /* Do common processing for the child, such as execing the command. */ 571 do_child(s, command); 572 /* NOTREACHED */ 573 } 574#ifdef _UNICOS 575 signal(WJSIGNAL, cray_job_termination_handler); 576#endif /* _UNICOS */ 577#ifdef HAVE_CYGWIN 578 if (is_winnt) 579 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); 580#endif 581 if (pid < 0) 582 packet_disconnect("fork failed: %.100s", strerror(errno)); 583 s->pid = pid; 584 585 /* Parent. Close the slave side of the pseudo tty. */ 586 close(ttyfd); 587 588 /* 589 * Create another descriptor of the pty master side for use as the 590 * standard input. We could use the original descriptor, but this 591 * simplifies code in server_loop. The descriptor is bidirectional. 592 */ 593 fdout = dup(ptyfd); 594 if (fdout < 0) 595 packet_disconnect("dup #1 failed: %.100s", strerror(errno)); 596 597 /* we keep a reference to the pty master */ 598 ptymaster = dup(ptyfd); 599 if (ptymaster < 0) 600 packet_disconnect("dup #2 failed: %.100s", strerror(errno)); 601 s->ptymaster = ptymaster; 602 603 /* Enter interactive session. */ 604 packet_set_interactive(1); 605 if (compat20) { 606 session_set_fds(s, ptyfd, fdout, -1); 607 } else { 608 server_loop(pid, ptyfd, fdout, -1); 609 /* server_loop _has_ closed ptyfd and fdout. */ 610 } 611} 612 613#ifdef LOGIN_NEEDS_UTMPX 614static void 615do_pre_login(Session *s) 616{ 617 socklen_t fromlen; 618 struct sockaddr_storage from; 619 pid_t pid = getpid(); 620 621 /* 622 * Get IP address of client. If the connection is not a socket, let 623 * the address be 0.0.0.0. 624 */ 625 memset(&from, 0, sizeof(from)); 626 fromlen = sizeof(from); 627 if (packet_connection_is_on_socket()) { 628 if (getpeername(packet_get_connection_in(), 629 (struct sockaddr *) & from, &fromlen) < 0) { 630 debug("getpeername: %.100s", strerror(errno)); 631 fatal_cleanup(); 632 } 633 } 634 635 record_utmp_only(pid, s->tty, s->pw->pw_name, 636 get_remote_name_or_ip(utmp_len, options.use_dns), 637 (struct sockaddr *)&from, fromlen); 638} 639#endif 640 641/* 642 * This is called to fork and execute a command. If another command is 643 * to be forced, execute that instead. 644 */ 645void 646do_exec(Session *s, const char *command) 647{ 648 if (forced_command) { 649 original_command = command; 650 command = forced_command; 651 debug("Forced command '%.900s'", command); 652 } 653 654#ifdef GSSAPI 655 if (options.gss_authentication) { 656 temporarily_use_uid(s->pw); 657 ssh_gssapi_storecreds(); 658 restore_uid(); 659 } 660#endif 661 662 if (s->ttyfd != -1) 663 do_exec_pty(s, command); 664 else 665 do_exec_no_pty(s, command); 666 667 original_command = NULL; 668} 669 670 671/* administrative, login(1)-like work */ 672void 673do_login(Session *s, const char *command) 674{ 675 char *time_string; 676 socklen_t fromlen; 677 struct sockaddr_storage from; 678 struct passwd * pw = s->pw; 679 pid_t pid = getpid(); 680 681 /* 682 * Get IP address of client. If the connection is not a socket, let 683 * the address be 0.0.0.0. 684 */ 685 memset(&from, 0, sizeof(from)); 686 fromlen = sizeof(from); 687 if (packet_connection_is_on_socket()) { 688 if (getpeername(packet_get_connection_in(), 689 (struct sockaddr *) & from, &fromlen) < 0) { 690 debug("getpeername: %.100s", strerror(errno)); 691 fatal_cleanup(); 692 } 693 } 694 695 /* Record that there was a login on that tty from the remote host. */ 696 if (!use_privsep) 697 record_login(pid, s->tty, pw->pw_name, pw->pw_uid, 698 get_remote_name_or_ip(utmp_len, 699 options.use_dns), 700 (struct sockaddr *)&from, fromlen); 701 702#ifdef USE_PAM 703 /* 704 * If password change is needed, do it now. 705 * This needs to occur before the ~/.hushlogin check. 706 */ 707 if (options.use_pam && is_pam_password_change_required()) { 708 print_pam_messages(); 709 do_pam_chauthtok(); 710 /* XXX - signal [net] parent to enable forwardings */ 711 } 712#endif 713 714 if (check_quietlogin(s, command)) 715 return; 716 717#ifdef USE_PAM 718 if (options.use_pam && !is_pam_password_change_required()) 719 print_pam_messages(); 720#endif /* USE_PAM */ 721 722 /* display post-login message */ 723 if (buffer_len(&loginmsg) > 0) { 724 buffer_append(&loginmsg, "\0", 1); 725 printf("%s\n", (char *)buffer_ptr(&loginmsg)); 726 } 727 buffer_free(&loginmsg); 728 729#ifndef NO_SSH_LASTLOG 730 if (options.print_lastlog && s->last_login_time != 0) { 731 time_string = ctime(&s->last_login_time); 732 if (strchr(time_string, '\n')) 733 *strchr(time_string, '\n') = 0; 734 if (strcmp(s->hostname, "") == 0) 735 printf("Last login: %s\r\n", time_string); 736 else 737 printf("Last login: %s from %s\r\n", time_string, 738 s->hostname); 739 } 740#endif /* NO_SSH_LASTLOG */ 741 742 do_motd(); 743} 744 745/* 746 * Display the message of the day. 747 */ 748void 749do_motd(void) 750{ 751 FILE *f; 752 char buf[256]; 753#ifdef HAVE_LOGIN_CAP 754 const char *fname; 755#endif 756 757#ifdef HAVE_LOGIN_CAP 758 fname = login_getcapstr(lc, "copyright", NULL, NULL); 759 if (fname != NULL && (f = fopen(fname, "r")) != NULL) { 760 while (fgets(buf, sizeof(buf), f) != NULL) 761 fputs(buf, stdout); 762 fclose(f); 763 } else 764#endif /* HAVE_LOGIN_CAP */ 765 (void)printf("%s\n\t%s %s\n", 766 "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994", 767 "The Regents of the University of California. ", 768 "All rights reserved."); 769 770 (void)printf("\n"); 771 772 if (options.print_motd) { 773#ifdef HAVE_LOGIN_CAP 774 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", 775 "/etc/motd"), "r"); 776#else 777 f = fopen("/etc/motd", "r"); 778#endif 779 if (f) { 780 while (fgets(buf, sizeof(buf), f)) 781 fputs(buf, stdout); 782 fclose(f); 783 } 784 } 785} 786 787 788/* 789 * Check for quiet login, either .hushlogin or command given. 790 */ 791int 792check_quietlogin(Session *s, const char *command) 793{ 794 char buf[256]; 795 struct passwd *pw = s->pw; 796 struct stat st; 797 798 /* Return 1 if .hushlogin exists or a command given. */ 799 if (command != NULL) 800 return 1; 801 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); 802#ifdef HAVE_LOGIN_CAP 803 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) 804 return 1; 805#else 806 if (stat(buf, &st) >= 0) 807 return 1; 808#endif 809 return 0; 810} 811 812/* 813 * Sets the value of the given variable in the environment. If the variable 814 * already exists, its value is overriden. 815 */ 816void 817child_set_env(char ***envp, u_int *envsizep, const char *name, 818 const char *value) 819{ 820 char **env; 821 u_int envsize; 822 u_int i, namelen; 823 824 /* 825 * If we're passed an uninitialized list, allocate a single null 826 * entry before continuing. 827 */ 828 if (*envp == NULL && *envsizep == 0) { 829 *envp = xmalloc(sizeof(char *)); 830 *envp[0] = NULL; 831 *envsizep = 1; 832 } 833 834 /* 835 * Find the slot where the value should be stored. If the variable 836 * already exists, we reuse the slot; otherwise we append a new slot 837 * at the end of the array, expanding if necessary. 838 */ 839 env = *envp; 840 namelen = strlen(name); 841 for (i = 0; env[i]; i++) 842 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') 843 break; 844 if (env[i]) { 845 /* Reuse the slot. */ 846 xfree(env[i]); 847 } else { 848 /* New variable. Expand if necessary. */ 849 envsize = *envsizep; 850 if (i >= envsize - 1) { 851 if (envsize >= 1000) 852 fatal("child_set_env: too many env vars"); 853 envsize += 50; 854 env = (*envp) = xrealloc(env, envsize * sizeof(char *)); 855 *envsizep = envsize; 856 } 857 /* Need to set the NULL pointer at end of array beyond the new slot. */ 858 env[i + 1] = NULL; 859 } 860 861 /* Allocate space and format the variable in the appropriate slot. */ 862 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); 863 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); 864} 865 866/* 867 * Reads environment variables from the given file and adds/overrides them 868 * into the environment. If the file does not exist, this does nothing. 869 * Otherwise, it must consist of empty lines, comments (line starts with '#') 870 * and assignments of the form name=value. No other forms are allowed. 871 */ 872static void 873read_environment_file(char ***env, u_int *envsize, 874 const char *filename) 875{ 876 FILE *f; 877 char buf[4096]; 878 char *cp, *value; 879 u_int lineno = 0; 880 881 f = fopen(filename, "r"); 882 if (!f) 883 return; 884 885 while (fgets(buf, sizeof(buf), f)) { 886 if (++lineno > 1000) 887 fatal("Too many lines in environment file %s", filename); 888 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) 889 ; 890 if (!*cp || *cp == '#' || *cp == '\n') 891 continue; 892 if (strchr(cp, '\n')) 893 *strchr(cp, '\n') = '\0'; 894 value = strchr(cp, '='); 895 if (value == NULL) { 896 fprintf(stderr, "Bad line %u in %.100s\n", lineno, 897 filename); 898 continue; 899 } 900 /* 901 * Replace the equals sign by nul, and advance value to 902 * the value string. 903 */ 904 *value = '\0'; 905 value++; 906 child_set_env(env, envsize, cp, value); 907 } 908 fclose(f); 909} 910 911#ifdef HAVE_ETC_DEFAULT_LOGIN 912/* 913 * Return named variable from specified environment, or NULL if not present. 914 */ 915static char * 916child_get_env(char **env, const char *name) 917{ 918 int i; 919 size_t len; 920 921 len = strlen(name); 922 for (i=0; env[i] != NULL; i++) 923 if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') 924 return(env[i] + len + 1); 925 return NULL; 926} 927 928/* 929 * Read /etc/default/login. 930 * We pick up the PATH (or SUPATH for root) and UMASK. 931 */ 932static void 933read_etc_default_login(char ***env, u_int *envsize, uid_t uid) 934{ 935 char **tmpenv = NULL, *var; 936 u_int i, tmpenvsize = 0; 937 mode_t mask; 938 939 /* 940 * We don't want to copy the whole file to the child's environment, 941 * so we use a temporary environment and copy the variables we're 942 * interested in. 943 */ 944 read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); 945 946 if (tmpenv == NULL) 947 return; 948 949 if (uid == 0) 950 var = child_get_env(tmpenv, "SUPATH"); 951 else 952 var = child_get_env(tmpenv, "PATH"); 953 if (var != NULL) 954 child_set_env(env, envsize, "PATH", var); 955 956 if ((var = child_get_env(tmpenv, "UMASK")) != NULL) 957 if (sscanf(var, "%5lo", &mask) == 1) 958 umask(mask); 959 960 for (i = 0; tmpenv[i] != NULL; i++) 961 xfree(tmpenv[i]); 962 xfree(tmpenv); 963} 964#endif /* HAVE_ETC_DEFAULT_LOGIN */ 965 966void copy_environment(char **source, char ***env, u_int *envsize) 967{ 968 char *var_name, *var_val; 969 int i; 970 971 if (source == NULL) 972 return; 973 974 for(i = 0; source[i] != NULL; i++) { 975 var_name = xstrdup(source[i]); 976 if ((var_val = strstr(var_name, "=")) == NULL) { 977 xfree(var_name); 978 continue; 979 } 980 *var_val++ = '\0'; 981 982 debug3("Copy environment: %s=%s", var_name, var_val); 983 child_set_env(env, envsize, var_name, var_val); 984 985 xfree(var_name); 986 } 987} 988 989static char ** 990do_setup_env(Session *s, const char *shell) 991{ 992 char buf[256]; 993 u_int i, envsize; 994 char **env, *laddr, *path = NULL; 995#ifdef HAVE_LOGIN_CAP 996 extern char **environ; 997 char **senv, **var; 998#endif 999 struct passwd *pw = s->pw; 1000 1001 /* Initialize the environment. */ 1002 envsize = 100; 1003 env = xmalloc(envsize * sizeof(char *)); 1004 env[0] = NULL; 1005 1006#ifdef HAVE_CYGWIN 1007 /* 1008 * The Windows environment contains some setting which are 1009 * important for a running system. They must not be dropped. 1010 */ 1011 copy_environment(environ, &env, &envsize); 1012#endif 1013 1014 if (getenv("TZ")) 1015 child_set_env(&env, &envsize, "TZ", getenv("TZ")); 1016 1017#ifdef GSSAPI 1018 /* Allow any GSSAPI methods that we've used to alter 1019 * the childs environment as they see fit 1020 */ 1021 ssh_gssapi_do_child(&env, &envsize); 1022#endif 1023 1024 if (!options.use_login) { 1025 /* Set basic environment. */ 1026 child_set_env(&env, &envsize, "USER", pw->pw_name); 1027 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); 1028#ifdef _AIX 1029 child_set_env(&env, &envsize, "LOGIN", pw->pw_name); 1030#endif 1031 child_set_env(&env, &envsize, "HOME", pw->pw_dir); 1032 snprintf(buf, sizeof buf, "%.200s/%.50s", 1033 _PATH_MAILDIR, pw->pw_name); 1034 child_set_env(&env, &envsize, "MAIL", buf); 1035#ifdef HAVE_LOGIN_CAP 1036 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); 1037 child_set_env(&env, &envsize, "TERM", "su"); 1038 senv = environ; 1039 environ = xmalloc(sizeof(char *)); 1040 *environ = NULL; 1041 (void) setusercontext(lc, pw, pw->pw_uid, 1042 LOGIN_SETENV|LOGIN_SETPATH); 1043 copy_environment(environ, &env, &envsize); 1044 for (var = environ; *var != NULL; ++var) 1045 xfree(*var); 1046 xfree(environ); 1047 environ = senv; 1048#else /* HAVE_LOGIN_CAP */ 1049# ifndef HAVE_CYGWIN 1050 /* 1051 * There's no standard path on Windows. The path contains 1052 * important components pointing to the system directories, 1053 * needed for loading shared libraries. So the path better 1054 * remains intact here. 1055 */ 1056# ifdef HAVE_ETC_DEFAULT_LOGIN 1057 read_etc_default_login(&env, &envsize, pw->pw_uid); 1058 path = child_get_env(env, "PATH"); 1059# endif /* HAVE_ETC_DEFAULT_LOGIN */ 1060 if (path == NULL || *path == '\0') { 1061 child_set_env(&env, &envsize, "PATH", 1062 s->pw->pw_uid == 0 ? 1063 SUPERUSER_PATH : _PATH_STDPATH); 1064 } 1065# endif /* HAVE_CYGWIN */ 1066#endif /* HAVE_LOGIN_CAP */ 1067 1068 /* Normal systems set SHELL by default. */ 1069 child_set_env(&env, &envsize, "SHELL", shell); 1070 } 1071 1072 /* Set custom environment options from RSA authentication. */ 1073 if (!options.use_login) { 1074 while (custom_environment) { 1075 struct envstring *ce = custom_environment; 1076 char *str = ce->s; 1077 1078 for (i = 0; str[i] != '=' && str[i]; i++) 1079 ; 1080 if (str[i] == '=') { 1081 str[i] = 0; 1082 child_set_env(&env, &envsize, str, str + i + 1); 1083 } 1084 custom_environment = ce->next; 1085 xfree(ce->s); 1086 xfree(ce); 1087 } 1088 } 1089 1090 /* SSH_CLIENT deprecated */ 1091 snprintf(buf, sizeof buf, "%.50s %d %d", 1092 get_remote_ipaddr(), get_remote_port(), get_local_port()); 1093 child_set_env(&env, &envsize, "SSH_CLIENT", buf); 1094 1095 laddr = get_local_ipaddr(packet_get_connection_in()); 1096 snprintf(buf, sizeof buf, "%.50s %d %.50s %d", 1097 get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); 1098 xfree(laddr); 1099 child_set_env(&env, &envsize, "SSH_CONNECTION", buf); 1100 1101 if (s->ttyfd != -1) 1102 child_set_env(&env, &envsize, "SSH_TTY", s->tty); 1103 if (s->term) 1104 child_set_env(&env, &envsize, "TERM", s->term); 1105 if (s->display) 1106 child_set_env(&env, &envsize, "DISPLAY", s->display); 1107 if (original_command) 1108 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", 1109 original_command); 1110 1111#ifdef _UNICOS 1112 if (cray_tmpdir[0] != '\0') 1113 child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); 1114#endif /* _UNICOS */ 1115 1116#ifdef _AIX 1117 { 1118 char *cp; 1119 1120 if ((cp = getenv("AUTHSTATE")) != NULL) 1121 child_set_env(&env, &envsize, "AUTHSTATE", cp); 1122 if ((cp = getenv("KRB5CCNAME")) != NULL) 1123 child_set_env(&env, &envsize, "KRB5CCNAME", cp); 1124 read_environment_file(&env, &envsize, "/etc/environment"); 1125 } 1126#endif 1127#ifdef KRB5 1128 if (s->authctxt->krb5_ticket_file) 1129 child_set_env(&env, &envsize, "KRB5CCNAME", 1130 s->authctxt->krb5_ticket_file); 1131#endif 1132#ifdef USE_PAM 1133 /* 1134 * Pull in any environment variables that may have 1135 * been set by PAM. 1136 */ 1137 if (options.use_pam) { 1138 char **p = fetch_pam_environment(); 1139 1140 copy_environment(p, &env, &envsize); 1141 free_pam_environment(p); 1142 } 1143#endif /* USE_PAM */ 1144 1145 if (auth_sock_name != NULL) 1146 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, 1147 auth_sock_name); 1148 1149 /* read $HOME/.ssh/environment. */ 1150 if (options.permit_user_env && !options.use_login) { 1151 snprintf(buf, sizeof buf, "%.200s/.ssh/environment", 1152 strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); 1153 read_environment_file(&env, &envsize, buf); 1154 } 1155 if (debug_flag) { 1156 /* dump the environment */ 1157 fprintf(stderr, "Environment:\n"); 1158 for (i = 0; env[i]; i++) 1159 fprintf(stderr, " %.200s\n", env[i]); 1160 } 1161 return env; 1162} 1163 1164/* 1165 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found 1166 * first in this order). 1167 */ 1168static void 1169do_rc_files(Session *s, const char *shell) 1170{ 1171 FILE *f = NULL; 1172 char cmd[1024]; 1173 int do_xauth; 1174 struct stat st; 1175 1176 do_xauth = 1177 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; 1178 1179 /* ignore _PATH_SSH_USER_RC for subsystems */ 1180 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { 1181 snprintf(cmd, sizeof cmd, "%s -c '%s %s'", 1182 shell, _PATH_BSHELL, _PATH_SSH_USER_RC); 1183 if (debug_flag) 1184 fprintf(stderr, "Running %s\n", cmd); 1185 f = popen(cmd, "w"); 1186 if (f) { 1187 if (do_xauth) 1188 fprintf(f, "%s %s\n", s->auth_proto, 1189 s->auth_data); 1190 pclose(f); 1191 } else 1192 fprintf(stderr, "Could not run %s\n", 1193 _PATH_SSH_USER_RC); 1194 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { 1195 if (debug_flag) 1196 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, 1197 _PATH_SSH_SYSTEM_RC); 1198 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); 1199 if (f) { 1200 if (do_xauth) 1201 fprintf(f, "%s %s\n", s->auth_proto, 1202 s->auth_data); 1203 pclose(f); 1204 } else 1205 fprintf(stderr, "Could not run %s\n", 1206 _PATH_SSH_SYSTEM_RC); 1207 } else if (do_xauth && options.xauth_location != NULL) { 1208 /* Add authority data to .Xauthority if appropriate. */ 1209 if (debug_flag) { 1210 fprintf(stderr, 1211 "Running %.500s remove %.100s\n", 1212 options.xauth_location, s->auth_display); 1213 fprintf(stderr, 1214 "%.500s add %.100s %.100s %.100s\n", 1215 options.xauth_location, s->auth_display, 1216 s->auth_proto, s->auth_data); 1217 } 1218 snprintf(cmd, sizeof cmd, "%s -q -", 1219 options.xauth_location); 1220 f = popen(cmd, "w"); 1221 if (f) { 1222 fprintf(f, "remove %s\n", 1223 s->auth_display); 1224 fprintf(f, "add %s %s %s\n", 1225 s->auth_display, s->auth_proto, 1226 s->auth_data); 1227 pclose(f); 1228 } else { 1229 fprintf(stderr, "Could not run %s\n", 1230 cmd); 1231 } 1232 } 1233} 1234 1235static void 1236do_nologin(struct passwd *pw) 1237{ 1238 FILE *f = NULL; 1239 char buf[1024]; 1240 1241#ifdef HAVE_LOGIN_CAP 1242 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) 1243 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, 1244 _PATH_NOLOGIN), "r"); 1245#else 1246 if (pw->pw_uid) 1247 f = fopen(_PATH_NOLOGIN, "r"); 1248#endif 1249 if (f) { 1250 /* /etc/nologin exists. Print its contents and exit. */ 1251 logit("User %.100s not allowed because %s exists", 1252 pw->pw_name, _PATH_NOLOGIN); 1253 while (fgets(buf, sizeof(buf), f)) 1254 fputs(buf, stderr); 1255 fclose(f); 1256 fflush(NULL); 1257 exit(254); 1258 } 1259} 1260 1261/* Set login name, uid, gid, and groups. */ 1262void 1263do_setusercontext(struct passwd *pw) 1264{ 1265#ifndef HAVE_CYGWIN 1266 if (getuid() == 0 || geteuid() == 0) 1267#endif /* HAVE_CYGWIN */ 1268 { 1269 1270#ifdef HAVE_SETPCRED 1271 if (setpcred(pw->pw_name, (char **)NULL) == -1) 1272 fatal("Failed to set process credentials"); 1273#endif /* HAVE_SETPCRED */ 1274#ifdef HAVE_LOGIN_CAP 1275# ifdef __bsdi__ 1276 setpgid(0, 0); 1277# endif 1278 if (setusercontext(lc, pw, pw->pw_uid, 1279 (LOGIN_SETALL & ~(LOGIN_SETENV|LOGIN_SETPATH))) < 0) { 1280 perror("unable to set user context"); 1281 exit(1); 1282 } 1283#else 1284# if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) 1285 /* Sets login uid for accounting */ 1286 if (getluid() == -1 && setluid(pw->pw_uid) == -1) 1287 error("setluid: %s", strerror(errno)); 1288# endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ 1289 1290 if (setlogin(pw->pw_name) < 0) 1291 error("setlogin failed: %s", strerror(errno)); 1292 if (setgid(pw->pw_gid) < 0) { 1293 perror("setgid"); 1294 exit(1); 1295 } 1296 /* Initialize the group list. */ 1297 if (initgroups(pw->pw_name, pw->pw_gid) < 0) { 1298 perror("initgroups"); 1299 exit(1); 1300 } 1301 endgrent(); 1302# ifdef USE_PAM 1303 /* 1304 * PAM credentials may take the form of supplementary groups. 1305 * These will have been wiped by the above initgroups() call. 1306 * Reestablish them here. 1307 */ 1308 if (options.use_pam) { 1309 do_pam_session(); 1310 do_pam_setcred(0); 1311 } 1312# endif /* USE_PAM */ 1313# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) 1314 irix_setusercontext(pw); 1315# endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ 1316# ifdef _AIX 1317 aix_usrinfo(pw); 1318# endif /* _AIX */ 1319 /* Permanently switch to the desired uid. */ 1320 permanently_set_uid(pw); 1321#endif 1322 } 1323 1324#ifdef HAVE_CYGWIN 1325 if (is_winnt) 1326#endif 1327 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) 1328 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); 1329} 1330 1331static void 1332launch_login(struct passwd *pw, const char *hostname) 1333{ 1334 /* Launch login(1). */ 1335 1336 execl(LOGIN_PROGRAM, "login", "-h", hostname, 1337#ifdef xxxLOGIN_NEEDS_TERM 1338 (s->term ? s->term : "unknown"), 1339#endif /* LOGIN_NEEDS_TERM */ 1340#ifdef LOGIN_NO_ENDOPT 1341 "-p", "-f", pw->pw_name, (char *)NULL); 1342#else 1343 "-p", "-f", "--", pw->pw_name, (char *)NULL); 1344#endif 1345 1346 /* Login couldn't be executed, die. */ 1347 1348 perror("login"); 1349 exit(1); 1350} 1351 1352/* 1353 * Performs common processing for the child, such as setting up the 1354 * environment, closing extra file descriptors, setting the user and group 1355 * ids, and executing the command or shell. 1356 */ 1357void 1358do_child(Session *s, const char *command) 1359{ 1360 extern char **environ; 1361 char **env; 1362 char *argv[10]; 1363 const char *shell, *shell0, *hostname = NULL; 1364 struct passwd *pw = s->pw; 1365 u_int i; 1366#ifdef HAVE_LOGIN_CAP 1367 int lc_requirehome; 1368#endif 1369 1370 /* remove hostkey from the child's memory */ 1371 destroy_sensitive_data(); 1372 1373 /* login(1) is only called if we execute the login shell */ 1374 if (options.use_login && command != NULL) 1375 options.use_login = 0; 1376 1377#ifdef _UNICOS 1378 cray_setup(pw->pw_uid, pw->pw_name, command); 1379#endif /* _UNICOS */ 1380 1381 /* 1382 * Login(1) does this as well, and it needs uid 0 for the "-h" 1383 * switch, so we let login(1) to this for us. 1384 */ 1385 if (!options.use_login) { 1386#ifdef HAVE_OSF_SIA 1387 session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); 1388 if (!check_quietlogin(s, command)) 1389 do_motd(); 1390#else /* HAVE_OSF_SIA */ 1391 do_nologin(pw); 1392 do_setusercontext(pw); 1393#endif /* HAVE_OSF_SIA */ 1394 } 1395 1396 /* 1397 * Get the shell from the password data. An empty shell field is 1398 * legal, and means /bin/sh. 1399 */ 1400 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; 1401 1402 /* 1403 * Make sure $SHELL points to the shell from the password file, 1404 * even if shell is overridden from login.conf 1405 */ 1406 env = do_setup_env(s, shell); 1407 1408#ifdef HAVE_LOGIN_CAP 1409 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); 1410#endif 1411 1412 /* we have to stash the hostname before we close our socket. */ 1413 if (options.use_login) 1414 hostname = get_remote_name_or_ip(utmp_len, 1415 options.use_dns); 1416 /* 1417 * Close the connection descriptors; note that this is the child, and 1418 * the server will still have the socket open, and it is important 1419 * that we do not shutdown it. Note that the descriptors cannot be 1420 * closed before building the environment, as we call 1421 * get_remote_ipaddr there. 1422 */ 1423 if (packet_get_connection_in() == packet_get_connection_out()) 1424 close(packet_get_connection_in()); 1425 else { 1426 close(packet_get_connection_in()); 1427 close(packet_get_connection_out()); 1428 } 1429 /* 1430 * Close all descriptors related to channels. They will still remain 1431 * open in the parent. 1432 */ 1433 /* XXX better use close-on-exec? -markus */ 1434 channel_close_all(); 1435 1436#ifdef HAVE_LOGIN_CAP 1437 lc_requirehome = login_getcapbool(lc, "requirehome", 0); 1438 login_close(lc); 1439#endif 1440 /* 1441 * Close any extra file descriptors. Note that there may still be 1442 * descriptors left by system functions. They will be closed later. 1443 */ 1444 endpwent(); 1445 1446 /* 1447 * Close any extra open file descriptors so that we don\'t have them 1448 * hanging around in clients. Note that we want to do this after 1449 * initgroups, because at least on Solaris 2.3 it leaves file 1450 * descriptors open. 1451 */ 1452 for (i = 3; i < 64; i++) 1453 close(i); 1454 1455 /* 1456 * Must take new environment into use so that .ssh/rc, 1457 * /etc/ssh/sshrc and xauth are run in the proper environment. 1458 */ 1459 environ = env; 1460 1461 /* Change current directory to the user\'s home directory. */ 1462 if (chdir(pw->pw_dir) < 0) { 1463 fprintf(stderr, "Could not chdir to home directory %s: %s\n", 1464 pw->pw_dir, strerror(errno)); 1465#ifdef HAVE_LOGIN_CAP 1466 if (lc_requirehome) 1467 exit(1); 1468#endif 1469 } 1470 1471 if (!options.use_login) 1472 do_rc_files(s, shell); 1473 1474 /* restore SIGPIPE for child */ 1475 signal(SIGPIPE, SIG_DFL); 1476 1477 if (options.use_login) { 1478 launch_login(pw, hostname); 1479 /* NEVERREACHED */ 1480 } 1481 1482 /* Get the last component of the shell name. */ 1483 if ((shell0 = strrchr(shell, '/')) != NULL) 1484 shell0++; 1485 else 1486 shell0 = shell; 1487 1488 /* 1489 * If we have no command, execute the shell. In this case, the shell 1490 * name to be passed in argv[0] is preceded by '-' to indicate that 1491 * this is a login shell. 1492 */ 1493 if (!command) { 1494 char argv0[256]; 1495 1496 /* Start the shell. Set initial character to '-'. */ 1497 argv0[0] = '-'; 1498 1499 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) 1500 >= sizeof(argv0) - 1) { 1501 errno = EINVAL; 1502 perror(shell); 1503 exit(1); 1504 } 1505 1506 /* Execute the shell. */ 1507 argv[0] = argv0; 1508 argv[1] = NULL; 1509 execve(shell, argv, env); 1510 1511 /* Executing the shell failed. */ 1512 perror(shell); 1513 exit(1); 1514 } 1515 /* 1516 * Execute the command using the user's shell. This uses the -c 1517 * option to execute the command. 1518 */ 1519 argv[0] = (char *) shell0; 1520 argv[1] = "-c"; 1521 argv[2] = (char *) command; 1522 argv[3] = NULL; 1523 execve(shell, argv, env); 1524 perror(shell); 1525 exit(1); 1526} 1527 1528Session * 1529session_new(void) 1530{ 1531 int i; 1532 static int did_init = 0; 1533 if (!did_init) { 1534 debug("session_new: init"); 1535 for (i = 0; i < MAX_SESSIONS; i++) { 1536 sessions[i].used = 0; 1537 } 1538 did_init = 1; 1539 } 1540 for (i = 0; i < MAX_SESSIONS; i++) { 1541 Session *s = &sessions[i]; 1542 if (! s->used) { 1543 memset(s, 0, sizeof(*s)); 1544 s->chanid = -1; 1545 s->ptyfd = -1; 1546 s->ttyfd = -1; 1547 s->used = 1; 1548 s->self = i; 1549 debug("session_new: session %d", i); 1550 return s; 1551 } 1552 } 1553 return NULL; 1554} 1555 1556static void 1557session_dump(void) 1558{ 1559 int i; 1560 for (i = 0; i < MAX_SESSIONS; i++) { 1561 Session *s = &sessions[i]; 1562 debug("dump: used %d session %d %p channel %d pid %ld", 1563 s->used, 1564 s->self, 1565 s, 1566 s->chanid, 1567 (long)s->pid); 1568 } 1569} 1570 1571int 1572session_open(Authctxt *authctxt, int chanid) 1573{ 1574 Session *s = session_new(); 1575 debug("session_open: channel %d", chanid); 1576 if (s == NULL) { 1577 error("no more sessions"); 1578 return 0; 1579 } 1580 s->authctxt = authctxt; 1581 s->pw = authctxt->pw; 1582 if (s->pw == NULL) 1583 fatal("no user for session %d", s->self); 1584 debug("session_open: session %d: link with channel %d", s->self, chanid); 1585 s->chanid = chanid; 1586 return 1; 1587} 1588 1589Session * 1590session_by_tty(char *tty) 1591{ 1592 int i; 1593 for (i = 0; i < MAX_SESSIONS; i++) { 1594 Session *s = &sessions[i]; 1595 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { 1596 debug("session_by_tty: session %d tty %s", i, tty); 1597 return s; 1598 } 1599 } 1600 debug("session_by_tty: unknown tty %.100s", tty); 1601 session_dump(); 1602 return NULL; 1603} 1604 1605static Session * 1606session_by_channel(int id) 1607{ 1608 int i; 1609 for (i = 0; i < MAX_SESSIONS; i++) { 1610 Session *s = &sessions[i]; 1611 if (s->used && s->chanid == id) { 1612 debug("session_by_channel: session %d channel %d", i, id); 1613 return s; 1614 } 1615 } 1616 debug("session_by_channel: unknown channel %d", id); 1617 session_dump(); 1618 return NULL; 1619} 1620 1621static Session * 1622session_by_pid(pid_t pid) 1623{ 1624 int i; 1625 debug("session_by_pid: pid %ld", (long)pid); 1626 for (i = 0; i < MAX_SESSIONS; i++) { 1627 Session *s = &sessions[i]; 1628 if (s->used && s->pid == pid) 1629 return s; 1630 } 1631 error("session_by_pid: unknown pid %ld", (long)pid); 1632 session_dump(); 1633 return NULL; 1634} 1635 1636static int 1637session_window_change_req(Session *s) 1638{ 1639 s->col = packet_get_int(); 1640 s->row = packet_get_int(); 1641 s->xpixel = packet_get_int(); 1642 s->ypixel = packet_get_int(); 1643 packet_check_eom(); 1644 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); 1645 return 1; 1646} 1647 1648static int 1649session_pty_req(Session *s) 1650{ 1651 u_int len; 1652 int n_bytes; 1653 1654 if (no_pty_flag) { 1655 debug("Allocating a pty not permitted for this authentication."); 1656 return 0; 1657 } 1658 if (s->ttyfd != -1) { 1659 packet_disconnect("Protocol error: you already have a pty."); 1660 return 0; 1661 } 1662 /* Get the time and hostname when the user last logged in. */ 1663 if (options.print_lastlog) { 1664 s->hostname[0] = '\0'; 1665 s->last_login_time = get_last_login_time(s->pw->pw_uid, 1666 s->pw->pw_name, s->hostname, sizeof(s->hostname)); 1667 } 1668 1669 s->term = packet_get_string(&len); 1670 1671 if (compat20) { 1672 s->col = packet_get_int(); 1673 s->row = packet_get_int(); 1674 } else { 1675 s->row = packet_get_int(); 1676 s->col = packet_get_int(); 1677 } 1678 s->xpixel = packet_get_int(); 1679 s->ypixel = packet_get_int(); 1680 1681 if (strcmp(s->term, "") == 0) { 1682 xfree(s->term); 1683 s->term = NULL; 1684 } 1685 1686 /* Allocate a pty and open it. */ 1687 debug("Allocating pty."); 1688 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { 1689 if (s->term) 1690 xfree(s->term); 1691 s->term = NULL; 1692 s->ptyfd = -1; 1693 s->ttyfd = -1; 1694 error("session_pty_req: session %d alloc failed", s->self); 1695 return 0; 1696 } 1697 debug("session_pty_req: session %d alloc %s", s->self, s->tty); 1698 1699 /* for SSH1 the tty modes length is not given */ 1700 if (!compat20) 1701 n_bytes = packet_remaining(); 1702 tty_parse_modes(s->ttyfd, &n_bytes); 1703 1704 /* 1705 * Add a cleanup function to clear the utmp entry and record logout 1706 * time in case we call fatal() (e.g., the connection gets closed). 1707 */ 1708 fatal_add_cleanup(session_pty_cleanup, (void *)s); 1709 if (!use_privsep) 1710 pty_setowner(s->pw, s->tty); 1711 1712 /* Set window size from the packet. */ 1713 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); 1714 1715 packet_check_eom(); 1716 session_proctitle(s); 1717 return 1; 1718} 1719 1720static int 1721session_subsystem_req(Session *s) 1722{ 1723 struct stat st; 1724 u_int len; 1725 int success = 0; 1726 char *cmd, *subsys = packet_get_string(&len); 1727 int i; 1728 1729 packet_check_eom(); 1730 logit("subsystem request for %.100s", subsys); 1731 1732 for (i = 0; i < options.num_subsystems; i++) { 1733 if (strcmp(subsys, options.subsystem_name[i]) == 0) { 1734 cmd = options.subsystem_command[i]; 1735 if (stat(cmd, &st) < 0) { 1736 error("subsystem: cannot stat %s: %s", cmd, 1737 strerror(errno)); 1738 break; 1739 } 1740 debug("subsystem: exec() %s", cmd); 1741 s->is_subsystem = 1; 1742 do_exec(s, cmd); 1743 success = 1; 1744 break; 1745 } 1746 } 1747 1748 if (!success) 1749 logit("subsystem request for %.100s failed, subsystem not found", 1750 subsys); 1751 1752 xfree(subsys); 1753 return success; 1754} 1755 1756static int 1757session_x11_req(Session *s) 1758{ 1759 int success; 1760 1761 s->single_connection = packet_get_char(); 1762 s->auth_proto = packet_get_string(NULL); 1763 s->auth_data = packet_get_string(NULL); 1764 s->screen = packet_get_int(); 1765 packet_check_eom(); 1766 1767 success = session_setup_x11fwd(s); 1768 if (!success) { 1769 xfree(s->auth_proto); 1770 xfree(s->auth_data); 1771 s->auth_proto = NULL; 1772 s->auth_data = NULL; 1773 } 1774 return success; 1775} 1776 1777static int 1778session_shell_req(Session *s) 1779{ 1780 packet_check_eom(); 1781 do_exec(s, NULL); 1782 return 1; 1783} 1784 1785static int 1786session_exec_req(Session *s) 1787{ 1788 u_int len; 1789 char *command = packet_get_string(&len); 1790 packet_check_eom(); 1791 do_exec(s, command); 1792 xfree(command); 1793 return 1; 1794} 1795 1796static int 1797session_break_req(Session *s) 1798{ 1799 u_int break_length; 1800 1801 break_length = packet_get_int(); /* ignored */ 1802 packet_check_eom(); 1803 1804 if (s->ttyfd == -1 || 1805 tcsendbreak(s->ttyfd, 0) < 0) 1806 return 0; 1807 return 1; 1808} 1809 1810static int 1811session_auth_agent_req(Session *s) 1812{ 1813 static int called = 0; 1814 packet_check_eom(); 1815 if (no_agent_forwarding_flag) { 1816 debug("session_auth_agent_req: no_agent_forwarding_flag"); 1817 return 0; 1818 } 1819 if (called) { 1820 return 0; 1821 } else { 1822 called = 1; 1823 return auth_input_request_forwarding(s->pw); 1824 } 1825} 1826 1827int 1828session_input_channel_req(Channel *c, const char *rtype) 1829{ 1830 int success = 0; 1831 Session *s; 1832 1833 if ((s = session_by_channel(c->self)) == NULL) { 1834 logit("session_input_channel_req: no session %d req %.100s", 1835 c->self, rtype); 1836 return 0; 1837 } 1838 debug("session_input_channel_req: session %d req %s", s->self, rtype); 1839 1840 /* 1841 * a session is in LARVAL state until a shell, a command 1842 * or a subsystem is executed 1843 */ 1844 if (c->type == SSH_CHANNEL_LARVAL) { 1845 if (strcmp(rtype, "shell") == 0) { 1846 success = session_shell_req(s); 1847 } else if (strcmp(rtype, "exec") == 0) { 1848 success = session_exec_req(s); 1849 } else if (strcmp(rtype, "pty-req") == 0) { 1850 success = session_pty_req(s); 1851 } else if (strcmp(rtype, "x11-req") == 0) { 1852 success = session_x11_req(s); 1853 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { 1854 success = session_auth_agent_req(s); 1855 } else if (strcmp(rtype, "subsystem") == 0) { 1856 success = session_subsystem_req(s); 1857 } else if (strcmp(rtype, "break") == 0) { 1858 success = session_break_req(s); 1859 } 1860 } 1861 if (strcmp(rtype, "window-change") == 0) { 1862 success = session_window_change_req(s); 1863 } 1864 return success; 1865} 1866 1867void 1868session_set_fds(Session *s, int fdin, int fdout, int fderr) 1869{ 1870 if (!compat20) 1871 fatal("session_set_fds: called for proto != 2.0"); 1872 /* 1873 * now that have a child and a pipe to the child, 1874 * we can activate our channel and register the fd's 1875 */ 1876 if (s->chanid == -1) 1877 fatal("no channel for session %d", s->self); 1878 channel_set_fds(s->chanid, 1879 fdout, fdin, fderr, 1880 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, 1881 1, 1882 CHAN_SES_WINDOW_DEFAULT); 1883} 1884 1885/* 1886 * Function to perform pty cleanup. Also called if we get aborted abnormally 1887 * (e.g., due to a dropped connection). 1888 */ 1889void 1890session_pty_cleanup2(void *session) 1891{ 1892 Session *s = session; 1893 1894 if (s == NULL) { 1895 error("session_pty_cleanup: no session"); 1896 return; 1897 } 1898 if (s->ttyfd == -1) 1899 return; 1900 1901 debug("session_pty_cleanup: session %d release %s", s->self, s->tty); 1902 1903 /* Record that the user has logged out. */ 1904 if (s->pid != 0) 1905 record_logout(s->pid, s->tty, s->pw->pw_name); 1906 1907 /* Release the pseudo-tty. */ 1908 if (getuid() == 0) 1909 pty_release(s->tty); 1910 1911 /* 1912 * Close the server side of the socket pairs. We must do this after 1913 * the pty cleanup, so that another process doesn't get this pty 1914 * while we're still cleaning up. 1915 */ 1916 if (close(s->ptymaster) < 0) 1917 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); 1918 1919 /* unlink pty from session */ 1920 s->ttyfd = -1; 1921} 1922 1923void 1924session_pty_cleanup(void *session) 1925{ 1926 PRIVSEP(session_pty_cleanup2(session)); 1927} 1928 1929static char * 1930sig2name(int sig) 1931{ 1932#define SSH_SIG(x) if (sig == SIG ## x) return #x 1933 SSH_SIG(ABRT); 1934 SSH_SIG(ALRM); 1935 SSH_SIG(FPE); 1936 SSH_SIG(HUP); 1937 SSH_SIG(ILL); 1938 SSH_SIG(INT); 1939 SSH_SIG(KILL); 1940 SSH_SIG(PIPE); 1941 SSH_SIG(QUIT); 1942 SSH_SIG(SEGV); 1943 SSH_SIG(TERM); 1944 SSH_SIG(USR1); 1945 SSH_SIG(USR2); 1946#undef SSH_SIG 1947 return "SIG@openssh.com"; 1948} 1949 1950static void 1951session_exit_message(Session *s, int status) 1952{ 1953 Channel *c; 1954 1955 if ((c = channel_lookup(s->chanid)) == NULL) 1956 fatal("session_exit_message: session %d: no channel %d", 1957 s->self, s->chanid); 1958 debug("session_exit_message: session %d channel %d pid %ld", 1959 s->self, s->chanid, (long)s->pid); 1960 1961 if (WIFEXITED(status)) { 1962 channel_request_start(s->chanid, "exit-status", 0); 1963 packet_put_int(WEXITSTATUS(status)); 1964 packet_send(); 1965 } else if (WIFSIGNALED(status)) { 1966 channel_request_start(s->chanid, "exit-signal", 0); 1967 packet_put_cstring(sig2name(WTERMSIG(status))); 1968#ifdef WCOREDUMP 1969 packet_put_char(WCOREDUMP(status)); 1970#else /* WCOREDUMP */ 1971 packet_put_char(0); 1972#endif /* WCOREDUMP */ 1973 packet_put_cstring(""); 1974 packet_put_cstring(""); 1975 packet_send(); 1976 } else { 1977 /* Some weird exit cause. Just exit. */ 1978 packet_disconnect("wait returned status %04x.", status); 1979 } 1980 1981 /* disconnect channel */ 1982 debug("session_exit_message: release channel %d", s->chanid); 1983 channel_cancel_cleanup(s->chanid); 1984 /* 1985 * emulate a write failure with 'chan_write_failed', nobody will be 1986 * interested in data we write. 1987 * Note that we must not call 'chan_read_failed', since there could 1988 * be some more data waiting in the pipe. 1989 */ 1990 if (c->ostate != CHAN_OUTPUT_CLOSED) 1991 chan_write_failed(c); 1992 s->chanid = -1; 1993} 1994 1995void 1996session_close(Session *s) 1997{ 1998 debug("session_close: session %d pid %ld", s->self, (long)s->pid); 1999 if (s->ttyfd != -1) { 2000 fatal_remove_cleanup(session_pty_cleanup, (void *)s); 2001 session_pty_cleanup(s); 2002 } 2003 if (s->term) 2004 xfree(s->term); 2005 if (s->display) 2006 xfree(s->display); 2007 if (s->auth_display) 2008 xfree(s->auth_display); 2009 if (s->auth_data) 2010 xfree(s->auth_data); 2011 if (s->auth_proto) 2012 xfree(s->auth_proto); 2013 s->used = 0; 2014 session_proctitle(s); 2015} 2016 2017void 2018session_close_by_pid(pid_t pid, int status) 2019{ 2020 Session *s = session_by_pid(pid); 2021 if (s == NULL) { 2022 debug("session_close_by_pid: no session for pid %ld", 2023 (long)pid); 2024 return; 2025 } 2026 if (s->chanid != -1) 2027 session_exit_message(s, status); 2028 session_close(s); 2029} 2030 2031/* 2032 * this is called when a channel dies before 2033 * the session 'child' itself dies 2034 */ 2035void 2036session_close_by_channel(int id, void *arg) 2037{ 2038 Session *s = session_by_channel(id); 2039 if (s == NULL) { 2040 debug("session_close_by_channel: no session for id %d", id); 2041 return; 2042 } 2043 debug("session_close_by_channel: channel %d child %ld", 2044 id, (long)s->pid); 2045 if (s->pid != 0) { 2046 debug("session_close_by_channel: channel %d: has child", id); 2047 /* 2048 * delay detach of session, but release pty, since 2049 * the fd's to the child are already closed 2050 */ 2051 if (s->ttyfd != -1) { 2052 fatal_remove_cleanup(session_pty_cleanup, (void *)s); 2053 session_pty_cleanup(s); 2054 } 2055 return; 2056 } 2057 /* detach by removing callback */ 2058 channel_cancel_cleanup(s->chanid); 2059 s->chanid = -1; 2060 session_close(s); 2061} 2062 2063void 2064session_destroy_all(void (*closefunc)(Session *)) 2065{ 2066 int i; 2067 for (i = 0; i < MAX_SESSIONS; i++) { 2068 Session *s = &sessions[i]; 2069 if (s->used) { 2070 if (closefunc != NULL) 2071 closefunc(s); 2072 else 2073 session_close(s); 2074 } 2075 } 2076} 2077 2078static char * 2079session_tty_list(void) 2080{ 2081 static char buf[1024]; 2082 int i; 2083 char *cp; 2084 2085 buf[0] = '\0'; 2086 for (i = 0; i < MAX_SESSIONS; i++) { 2087 Session *s = &sessions[i]; 2088 if (s->used && s->ttyfd != -1) { 2089 2090 if (strncmp(s->tty, "/dev/", 5) != 0) { 2091 cp = strrchr(s->tty, '/'); 2092 cp = (cp == NULL) ? s->tty : cp + 1; 2093 } else 2094 cp = s->tty + 5; 2095 2096 if (buf[0] != '\0') 2097 strlcat(buf, ",", sizeof buf); 2098 strlcat(buf, cp, sizeof buf); 2099 } 2100 } 2101 if (buf[0] == '\0') 2102 strlcpy(buf, "notty", sizeof buf); 2103 return buf; 2104} 2105 2106void 2107session_proctitle(Session *s) 2108{ 2109 if (s->pw == NULL) 2110 error("no user for session %d", s->self); 2111 else 2112 setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); 2113} 2114 2115int 2116session_setup_x11fwd(Session *s) 2117{ 2118 struct stat st; 2119 char display[512], auth_display[512]; 2120 char hostname[MAXHOSTNAMELEN]; 2121 2122 if (no_x11_forwarding_flag) { 2123 packet_send_debug("X11 forwarding disabled in user configuration file."); 2124 return 0; 2125 } 2126 if (!options.x11_forwarding) { 2127 debug("X11 forwarding disabled in server configuration file."); 2128 return 0; 2129 } 2130 if (!options.xauth_location || 2131 (stat(options.xauth_location, &st) == -1)) { 2132 packet_send_debug("No xauth program; cannot forward with spoofing."); 2133 return 0; 2134 } 2135 if (options.use_login) { 2136 packet_send_debug("X11 forwarding disabled; " 2137 "not compatible with UseLogin=yes."); 2138 return 0; 2139 } 2140 if (s->display != NULL) { 2141 debug("X11 display already set."); 2142 return 0; 2143 } 2144 if (x11_create_display_inet(options.x11_display_offset, 2145 options.x11_use_localhost, s->single_connection, 2146 &s->display_number) == -1) { 2147 debug("x11_create_display_inet failed."); 2148 return 0; 2149 } 2150 2151 /* Set up a suitable value for the DISPLAY variable. */ 2152 if (gethostname(hostname, sizeof(hostname)) < 0) 2153 fatal("gethostname: %.100s", strerror(errno)); 2154 /* 2155 * auth_display must be used as the displayname when the 2156 * authorization entry is added with xauth(1). This will be 2157 * different than the DISPLAY string for localhost displays. 2158 */ 2159 if (options.x11_use_localhost) { 2160 snprintf(display, sizeof display, "localhost:%u.%u", 2161 s->display_number, s->screen); 2162 snprintf(auth_display, sizeof auth_display, "unix:%u.%u", 2163 s->display_number, s->screen); 2164 s->display = xstrdup(display); 2165 s->auth_display = xstrdup(auth_display); 2166 } else { 2167#ifdef IPADDR_IN_DISPLAY 2168 struct hostent *he; 2169 struct in_addr my_addr; 2170 2171 he = gethostbyname(hostname); 2172 if (he == NULL) { 2173 error("Can't get IP address for X11 DISPLAY."); 2174 packet_send_debug("Can't get IP address for X11 DISPLAY."); 2175 return 0; 2176 } 2177 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); 2178 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), 2179 s->display_number, s->screen); 2180#else 2181 snprintf(display, sizeof display, "%.400s:%u.%u", hostname, 2182 s->display_number, s->screen); 2183#endif 2184 s->display = xstrdup(display); 2185 s->auth_display = xstrdup(display); 2186 } 2187 2188 return 1; 2189} 2190 2191static void 2192do_authenticated2(Authctxt *authctxt) 2193{ 2194 server_loop2(authctxt); 2195#if defined(GSSAPI) 2196 if (options.gss_cleanup_creds) 2197 ssh_gssapi_cleanup_creds(NULL); 2198#endif 2199} 2200