session.c revision 120161
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 1.154 2003/03/05 22:33:43 markus Exp $"); 37RCSID("$FreeBSD: head/crypto/openssh/session.c 120161 2003-09-17 14:36:14Z nectar $"); 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 HAVE_CYGWIN 63#include <windows.h> 64#include <sys/cygwin.h> 65#define is_winnt (GetVersion() < 0x80000000) 66#endif 67 68/* func */ 69 70Session *session_new(void); 71void session_set_fds(Session *, int, int, int); 72void session_pty_cleanup(void *); 73void session_proctitle(Session *); 74int session_setup_x11fwd(Session *); 75void do_exec_pty(Session *, const char *); 76void do_exec_no_pty(Session *, const char *); 77void do_exec(Session *, const char *); 78void do_login(Session *, const char *); 79#ifdef LOGIN_NEEDS_UTMPX 80static void do_pre_login(Session *s); 81#endif 82void do_child(Session *, const char *); 83void do_motd(void); 84int check_quietlogin(Session *, const char *); 85 86static void do_authenticated1(Authctxt *); 87static void do_authenticated2(Authctxt *); 88 89static int session_pty_req(Session *); 90 91/* import */ 92extern ServerOptions options; 93extern char *__progname; 94extern int log_stderr; 95extern int debug_flag; 96extern u_int utmp_len; 97extern int startup_pipe; 98extern void destroy_sensitive_data(void); 99 100/* original command from peer. */ 101const char *original_command = NULL; 102 103/* data */ 104#define MAX_SESSIONS 10 105Session sessions[MAX_SESSIONS]; 106 107#ifdef WITH_AIXAUTHENTICATE 108char *aixloginmsg; 109#endif /* WITH_AIXAUTHENTICATE */ 110 111#ifdef HAVE_LOGIN_CAP 112login_cap_t *lc; 113#endif 114 115/* Name and directory of socket for authentication agent forwarding. */ 116static char *auth_sock_name = NULL; 117static char *auth_sock_dir = NULL; 118 119/* removes the agent forwarding socket */ 120 121static void 122auth_sock_cleanup_proc(void *_pw) 123{ 124 struct passwd *pw = _pw; 125 126 if (auth_sock_name != NULL) { 127 temporarily_use_uid(pw); 128 unlink(auth_sock_name); 129 rmdir(auth_sock_dir); 130 auth_sock_name = NULL; 131 restore_uid(); 132 } 133} 134 135static int 136auth_input_request_forwarding(struct passwd * pw) 137{ 138 Channel *nc; 139 int sock; 140 struct sockaddr_un sunaddr; 141 142 if (auth_sock_name != NULL) { 143 error("authentication forwarding requested twice."); 144 return 0; 145 } 146 147 /* Temporarily drop privileged uid for mkdir/bind. */ 148 temporarily_use_uid(pw); 149 150 /* Allocate a buffer for the socket name, and format the name. */ 151 auth_sock_name = xmalloc(MAXPATHLEN); 152 auth_sock_dir = xmalloc(MAXPATHLEN); 153 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); 154 155 /* Create private directory for socket */ 156 if (mkdtemp(auth_sock_dir) == NULL) { 157 packet_send_debug("Agent forwarding disabled: " 158 "mkdtemp() failed: %.100s", strerror(errno)); 159 restore_uid(); 160 xfree(auth_sock_name); 161 xfree(auth_sock_dir); 162 auth_sock_name = NULL; 163 auth_sock_dir = NULL; 164 return 0; 165 } 166 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", 167 auth_sock_dir, (long) getpid()); 168 169 /* delete agent socket on fatal() */ 170 fatal_add_cleanup(auth_sock_cleanup_proc, pw); 171 172 /* Create the socket. */ 173 sock = socket(AF_UNIX, SOCK_STREAM, 0); 174 if (sock < 0) 175 packet_disconnect("socket: %.100s", strerror(errno)); 176 177 /* Bind it to the name. */ 178 memset(&sunaddr, 0, sizeof(sunaddr)); 179 sunaddr.sun_family = AF_UNIX; 180 strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); 181 182 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) 183 packet_disconnect("bind: %.100s", strerror(errno)); 184 185 /* Restore the privileged uid. */ 186 restore_uid(); 187 188 /* Start listening on the socket. */ 189 if (listen(sock, 5) < 0) 190 packet_disconnect("listen: %.100s", strerror(errno)); 191 192 /* Allocate a channel for the authentication agent socket. */ 193 nc = channel_new("auth socket", 194 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, 195 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 196 0, xstrdup("auth socket"), 1); 197 strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); 198 return 1; 199} 200 201 202void 203do_authenticated(Authctxt *authctxt) 204{ 205 setproctitle("%s", authctxt->pw->pw_name); 206 207 /* 208 * Cancel the alarm we set to limit the time taken for 209 * authentication. 210 */ 211 alarm(0); 212 if (startup_pipe != -1) { 213 close(startup_pipe); 214 startup_pipe = -1; 215 } 216 217 /* setup the channel layer */ 218 if (!no_port_forwarding_flag && options.allow_tcp_forwarding) 219 channel_permit_all_opens(); 220 221 if (compat20) 222 do_authenticated2(authctxt); 223 else 224 do_authenticated1(authctxt); 225 226 /* remove agent socket */ 227 if (auth_sock_name != NULL) 228 auth_sock_cleanup_proc(authctxt->pw); 229#ifdef KRB4 230 if (options.kerberos_ticket_cleanup) 231 krb4_cleanup_proc(authctxt); 232#endif 233#ifdef KRB5 234 if (options.kerberos_ticket_cleanup) 235 krb5_cleanup_proc(authctxt); 236#endif 237} 238 239/* 240 * Prepares for an interactive session. This is called after the user has 241 * been successfully authenticated. During this message exchange, pseudo 242 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings 243 * are requested, etc. 244 */ 245static void 246do_authenticated1(Authctxt *authctxt) 247{ 248 Session *s; 249 char *command; 250 int success, type, screen_flag; 251 int enable_compression_after_reply = 0; 252 u_int proto_len, data_len, dlen, compression_level = 0; 253 254 s = session_new(); 255 s->authctxt = authctxt; 256 s->pw = authctxt->pw; 257 258 /* 259 * We stay in this loop until the client requests to execute a shell 260 * or a command. 261 */ 262 for (;;) { 263 success = 0; 264 265 /* Get a packet from the client. */ 266 type = packet_read(); 267 268 /* Process the packet. */ 269 switch (type) { 270 case SSH_CMSG_REQUEST_COMPRESSION: 271 compression_level = packet_get_int(); 272 packet_check_eom(); 273 if (compression_level < 1 || compression_level > 9) { 274 packet_send_debug("Received illegal compression level %d.", 275 compression_level); 276 break; 277 } 278 if (!options.compression) { 279 debug2("compression disabled"); 280 break; 281 } 282 /* Enable compression after we have responded with SUCCESS. */ 283 enable_compression_after_reply = 1; 284 success = 1; 285 break; 286 287 case SSH_CMSG_REQUEST_PTY: 288 success = session_pty_req(s); 289 break; 290 291 case SSH_CMSG_X11_REQUEST_FORWARDING: 292 s->auth_proto = packet_get_string(&proto_len); 293 s->auth_data = packet_get_string(&data_len); 294 295 screen_flag = packet_get_protocol_flags() & 296 SSH_PROTOFLAG_SCREEN_NUMBER; 297 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); 298 299 if (packet_remaining() == 4) { 300 if (!screen_flag) 301 debug2("Buggy client: " 302 "X11 screen flag missing"); 303 s->screen = packet_get_int(); 304 } else { 305 s->screen = 0; 306 } 307 packet_check_eom(); 308 success = session_setup_x11fwd(s); 309 if (!success) { 310 xfree(s->auth_proto); 311 xfree(s->auth_data); 312 s->auth_proto = NULL; 313 s->auth_data = NULL; 314 } 315 break; 316 317 case SSH_CMSG_AGENT_REQUEST_FORWARDING: 318 if (no_agent_forwarding_flag || compat13) { 319 debug("Authentication agent forwarding not permitted for this authentication."); 320 break; 321 } 322 debug("Received authentication agent forwarding request."); 323 success = auth_input_request_forwarding(s->pw); 324 break; 325 326 case SSH_CMSG_PORT_FORWARD_REQUEST: 327 if (no_port_forwarding_flag) { 328 debug("Port forwarding not permitted for this authentication."); 329 break; 330 } 331 if (!options.allow_tcp_forwarding) { 332 debug("Port forwarding not permitted."); 333 break; 334 } 335 debug("Received TCP/IP port forwarding request."); 336 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); 337 success = 1; 338 break; 339 340 case SSH_CMSG_MAX_PACKET_SIZE: 341 if (packet_set_maxsize(packet_get_int()) > 0) 342 success = 1; 343 break; 344 345#if defined(AFS) || defined(KRB5) 346 case SSH_CMSG_HAVE_KERBEROS_TGT: 347 if (!options.kerberos_tgt_passing) { 348 verbose("Kerberos TGT passing disabled."); 349 } else { 350 char *kdata = packet_get_string(&dlen); 351 packet_check_eom(); 352 353 /* XXX - 0x41, see creds_to_radix version */ 354 if (kdata[0] != 0x41) { 355#ifdef KRB5 356 krb5_data tgt; 357 tgt.data = kdata; 358 tgt.length = dlen; 359 360 if (auth_krb5_tgt(s->authctxt, &tgt)) 361 success = 1; 362 else 363 verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user); 364#endif /* KRB5 */ 365 } else { 366#ifdef AFS 367 if (auth_krb4_tgt(s->authctxt, kdata)) 368 success = 1; 369 else 370 verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user); 371#endif /* AFS */ 372 } 373 xfree(kdata); 374 } 375 break; 376#endif /* AFS || KRB5 */ 377 378#ifdef AFS 379 case SSH_CMSG_HAVE_AFS_TOKEN: 380 if (!options.afs_token_passing || !k_hasafs()) { 381 verbose("AFS token passing disabled."); 382 } else { 383 /* Accept AFS token. */ 384 char *token = packet_get_string(&dlen); 385 packet_check_eom(); 386 387 if (auth_afs_token(s->authctxt, token)) 388 success = 1; 389 else 390 verbose("AFS token refused for %.100s", 391 s->authctxt->user); 392 xfree(token); 393 } 394 break; 395#endif /* AFS */ 396 397 case SSH_CMSG_EXEC_SHELL: 398 case SSH_CMSG_EXEC_CMD: 399 if (type == SSH_CMSG_EXEC_CMD) { 400 command = packet_get_string(&dlen); 401 debug("Exec command '%.500s'", command); 402 do_exec(s, command); 403 xfree(command); 404 } else { 405 do_exec(s, NULL); 406 } 407 packet_check_eom(); 408 session_close(s); 409 return; 410 411 default: 412 /* 413 * Any unknown messages in this phase are ignored, 414 * and a failure message is returned. 415 */ 416 log("Unknown packet type received after authentication: %d", type); 417 } 418 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); 419 packet_send(); 420 packet_write_wait(); 421 422 /* Enable compression now that we have replied if appropriate. */ 423 if (enable_compression_after_reply) { 424 enable_compression_after_reply = 0; 425 packet_start_compression(compression_level); 426 } 427 } 428} 429 430/* 431 * This is called to fork and execute a command when we have no tty. This 432 * will call do_child from the child, and server_loop from the parent after 433 * setting up file descriptors and such. 434 */ 435void 436do_exec_no_pty(Session *s, const char *command) 437{ 438 pid_t pid; 439 440#ifdef USE_PIPES 441 int pin[2], pout[2], perr[2]; 442 /* Allocate pipes for communicating with the program. */ 443 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) 444 packet_disconnect("Could not create pipes: %.100s", 445 strerror(errno)); 446#else /* USE_PIPES */ 447 int inout[2], err[2]; 448 /* Uses socket pairs to communicate with the program. */ 449 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || 450 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) 451 packet_disconnect("Could not create socket pairs: %.100s", 452 strerror(errno)); 453#endif /* USE_PIPES */ 454 if (s == NULL) 455 fatal("do_exec_no_pty: no session"); 456 457 session_proctitle(s); 458 459#if defined(USE_PAM) 460 do_pam_session(s->pw->pw_name, NULL); 461 do_pam_setcred(1); 462 if (is_pam_password_change_required()) 463 packet_disconnect("Password change required but no " 464 "TTY available"); 465#endif /* USE_PAM */ 466 467 /* Fork the child. */ 468 if ((pid = fork()) == 0) { 469 fatal_remove_all_cleanups(); 470 471 /* Child. Reinitialize the log since the pid has changed. */ 472 log_init(__progname, options.log_level, options.log_facility, log_stderr); 473 474 /* 475 * Create a new session and process group since the 4.4BSD 476 * setlogin() affects the entire process group. 477 */ 478 if (setsid() < 0) 479 error("setsid failed: %.100s", strerror(errno)); 480 481#ifdef USE_PIPES 482 /* 483 * Redirect stdin. We close the parent side of the socket 484 * pair, and make the child side the standard input. 485 */ 486 close(pin[1]); 487 if (dup2(pin[0], 0) < 0) 488 perror("dup2 stdin"); 489 close(pin[0]); 490 491 /* Redirect stdout. */ 492 close(pout[0]); 493 if (dup2(pout[1], 1) < 0) 494 perror("dup2 stdout"); 495 close(pout[1]); 496 497 /* Redirect stderr. */ 498 close(perr[0]); 499 if (dup2(perr[1], 2) < 0) 500 perror("dup2 stderr"); 501 close(perr[1]); 502#else /* USE_PIPES */ 503 /* 504 * Redirect stdin, stdout, and stderr. Stdin and stdout will 505 * use the same socket, as some programs (particularly rdist) 506 * seem to depend on it. 507 */ 508 close(inout[1]); 509 close(err[1]); 510 if (dup2(inout[0], 0) < 0) /* stdin */ 511 perror("dup2 stdin"); 512 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ 513 perror("dup2 stdout"); 514 if (dup2(err[0], 2) < 0) /* stderr */ 515 perror("dup2 stderr"); 516#endif /* USE_PIPES */ 517 518#ifdef _UNICOS 519 cray_init_job(s->pw); /* set up cray jid and tmpdir */ 520#endif 521 522 /* Do processing for the child (exec command etc). */ 523 do_child(s, command); 524 /* NOTREACHED */ 525 } 526#ifdef _UNICOS 527 signal(WJSIGNAL, cray_job_termination_handler); 528#endif /* _UNICOS */ 529#ifdef HAVE_CYGWIN 530 if (is_winnt) 531 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); 532#endif 533 if (pid < 0) 534 packet_disconnect("fork failed: %.100s", strerror(errno)); 535 s->pid = pid; 536 /* Set interactive/non-interactive mode. */ 537 packet_set_interactive(s->display != NULL); 538#ifdef USE_PIPES 539 /* We are the parent. Close the child sides of the pipes. */ 540 close(pin[0]); 541 close(pout[1]); 542 close(perr[1]); 543 544 if (compat20) { 545 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); 546 } else { 547 /* Enter the interactive session. */ 548 server_loop(pid, pin[1], pout[0], perr[0]); 549 /* server_loop has closed pin[1], pout[0], and perr[0]. */ 550 } 551#else /* USE_PIPES */ 552 /* We are the parent. Close the child sides of the socket pairs. */ 553 close(inout[0]); 554 close(err[0]); 555 556 /* 557 * Enter the interactive session. Note: server_loop must be able to 558 * handle the case that fdin and fdout are the same. 559 */ 560 if (compat20) { 561 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); 562 } else { 563 server_loop(pid, inout[1], inout[1], err[1]); 564 /* server_loop has closed inout[1] and err[1]. */ 565 } 566#endif /* USE_PIPES */ 567} 568 569/* 570 * This is called to fork and execute a command when we have a tty. This 571 * will call do_child from the child, and server_loop from the parent after 572 * setting up file descriptors, controlling tty, updating wtmp, utmp, 573 * lastlog, and other such operations. 574 */ 575void 576do_exec_pty(Session *s, const char *command) 577{ 578 int fdout, ptyfd, ttyfd, ptymaster; 579 pid_t pid; 580 581 if (s == NULL) 582 fatal("do_exec_pty: no session"); 583 ptyfd = s->ptyfd; 584 ttyfd = s->ttyfd; 585 586#if defined(USE_PAM) 587 do_pam_session(s->pw->pw_name, s->tty); 588 do_pam_setcred(1); 589#endif 590 591 /* Fork the child. */ 592 if ((pid = fork()) == 0) { 593 fatal_remove_all_cleanups(); 594 595 /* Child. Reinitialize the log because the pid has changed. */ 596 log_init(__progname, options.log_level, options.log_facility, log_stderr); 597 /* Close the master side of the pseudo tty. */ 598 close(ptyfd); 599 600 /* Make the pseudo tty our controlling tty. */ 601 pty_make_controlling_tty(&ttyfd, s->tty); 602 603 /* Redirect stdin/stdout/stderr from the pseudo tty. */ 604 if (dup2(ttyfd, 0) < 0) 605 error("dup2 stdin: %s", strerror(errno)); 606 if (dup2(ttyfd, 1) < 0) 607 error("dup2 stdout: %s", strerror(errno)); 608 if (dup2(ttyfd, 2) < 0) 609 error("dup2 stderr: %s", strerror(errno)); 610 611 /* Close the extra descriptor for the pseudo tty. */ 612 close(ttyfd); 613 614 /* record login, etc. similar to login(1) */ 615#ifndef HAVE_OSF_SIA 616 if (!(options.use_login && command == NULL)) { 617#ifdef _UNICOS 618 cray_init_job(s->pw); /* set up cray jid and tmpdir */ 619#endif /* _UNICOS */ 620 do_login(s, command); 621 } 622# ifdef LOGIN_NEEDS_UTMPX 623 else 624 do_pre_login(s); 625# endif 626#endif 627 628 /* Do common processing for the child, such as execing the command. */ 629 do_child(s, command); 630 /* NOTREACHED */ 631 } 632#ifdef _UNICOS 633 signal(WJSIGNAL, cray_job_termination_handler); 634#endif /* _UNICOS */ 635#ifdef HAVE_CYGWIN 636 if (is_winnt) 637 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); 638#endif 639 if (pid < 0) 640 packet_disconnect("fork failed: %.100s", strerror(errno)); 641 s->pid = pid; 642 643 /* Parent. Close the slave side of the pseudo tty. */ 644 close(ttyfd); 645 646 /* 647 * Create another descriptor of the pty master side for use as the 648 * standard input. We could use the original descriptor, but this 649 * simplifies code in server_loop. The descriptor is bidirectional. 650 */ 651 fdout = dup(ptyfd); 652 if (fdout < 0) 653 packet_disconnect("dup #1 failed: %.100s", strerror(errno)); 654 655 /* we keep a reference to the pty master */ 656 ptymaster = dup(ptyfd); 657 if (ptymaster < 0) 658 packet_disconnect("dup #2 failed: %.100s", strerror(errno)); 659 s->ptymaster = ptymaster; 660 661 /* Enter interactive session. */ 662 packet_set_interactive(1); 663 if (compat20) { 664 session_set_fds(s, ptyfd, fdout, -1); 665 } else { 666 server_loop(pid, ptyfd, fdout, -1); 667 /* server_loop _has_ closed ptyfd and fdout. */ 668 } 669} 670 671#ifdef LOGIN_NEEDS_UTMPX 672static void 673do_pre_login(Session *s) 674{ 675 socklen_t fromlen; 676 struct sockaddr_storage from; 677 pid_t pid = getpid(); 678 679 /* 680 * Get IP address of client. If the connection is not a socket, let 681 * the address be 0.0.0.0. 682 */ 683 memset(&from, 0, sizeof(from)); 684 fromlen = sizeof(from); 685 if (packet_connection_is_on_socket()) { 686 if (getpeername(packet_get_connection_in(), 687 (struct sockaddr *) & from, &fromlen) < 0) { 688 debug("getpeername: %.100s", strerror(errno)); 689 fatal_cleanup(); 690 } 691 } 692 693 record_utmp_only(pid, s->tty, s->pw->pw_name, 694 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping), 695 (struct sockaddr *)&from, fromlen); 696} 697#endif 698 699/* 700 * This is called to fork and execute a command. If another command is 701 * to be forced, execute that instead. 702 */ 703void 704do_exec(Session *s, const char *command) 705{ 706 if (forced_command) { 707 original_command = command; 708 command = forced_command; 709 debug("Forced command '%.900s'", command); 710 } 711 712 if (s->ttyfd != -1) 713 do_exec_pty(s, command); 714 else 715 do_exec_no_pty(s, command); 716 717 original_command = NULL; 718} 719 720 721/* administrative, login(1)-like work */ 722void 723do_login(Session *s, const char *command) 724{ 725 char *time_string; 726 socklen_t fromlen; 727 struct sockaddr_storage from; 728 struct passwd * pw = s->pw; 729 pid_t pid = getpid(); 730 731 /* 732 * Get IP address of client. If the connection is not a socket, let 733 * the address be 0.0.0.0. 734 */ 735 memset(&from, 0, sizeof(from)); 736 fromlen = sizeof(from); 737 if (packet_connection_is_on_socket()) { 738 if (getpeername(packet_get_connection_in(), 739 (struct sockaddr *) & from, &fromlen) < 0) { 740 debug("getpeername: %.100s", strerror(errno)); 741 fatal_cleanup(); 742 } 743 } 744 745 /* Record that there was a login on that tty from the remote host. */ 746 if (!use_privsep) 747 record_login(pid, s->tty, pw->pw_name, pw->pw_uid, 748 get_remote_name_or_ip(utmp_len, 749 options.verify_reverse_mapping), 750 (struct sockaddr *)&from, fromlen); 751 752#ifdef USE_PAM 753 /* 754 * If password change is needed, do it now. 755 * This needs to occur before the ~/.hushlogin check. 756 */ 757 if (is_pam_password_change_required()) { 758 print_pam_messages(); 759 do_pam_chauthtok(); 760 } 761#endif 762 763 if (check_quietlogin(s, command)) 764 return; 765 766#ifdef USE_PAM 767 if (!is_pam_password_change_required()) 768 print_pam_messages(); 769#endif /* USE_PAM */ 770#ifdef WITH_AIXAUTHENTICATE 771 if (aixloginmsg && *aixloginmsg) 772 printf("%s\n", aixloginmsg); 773#endif /* WITH_AIXAUTHENTICATE */ 774 775#ifndef NO_SSH_LASTLOG 776 if (options.print_lastlog && s->last_login_time != 0) { 777 time_string = ctime(&s->last_login_time); 778 if (strchr(time_string, '\n')) 779 *strchr(time_string, '\n') = 0; 780 if (strcmp(s->hostname, "") == 0) 781 printf("Last login: %s\r\n", time_string); 782 else 783 printf("Last login: %s from %s\r\n", time_string, 784 s->hostname); 785 } 786#endif /* NO_SSH_LASTLOG */ 787 788 do_motd(); 789} 790 791/* 792 * Display the message of the day. 793 */ 794void 795do_motd(void) 796{ 797 FILE *f; 798 char buf[256]; 799#ifdef HAVE_LOGIN_CAP 800 const char *fname; 801#endif 802 803#ifdef HAVE_LOGIN_CAP 804 fname = login_getcapstr(lc, "copyright", NULL, NULL); 805 if (fname != NULL && (f = fopen(fname, "r")) != NULL) { 806 while (fgets(buf, sizeof(buf), f) != NULL) 807 fputs(buf, stdout); 808 fclose(f); 809 } else 810#endif /* HAVE_LOGIN_CAP */ 811 (void)printf("%s\n\t%s %s\n", 812 "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994", 813 "The Regents of the University of California. ", 814 "All rights reserved."); 815 816 (void)printf("\n"); 817 818 if (options.print_motd) { 819#ifdef HAVE_LOGIN_CAP 820 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", 821 "/etc/motd"), "r"); 822#else 823 f = fopen("/etc/motd", "r"); 824#endif 825 if (f) { 826 while (fgets(buf, sizeof(buf), f)) 827 fputs(buf, stdout); 828 fclose(f); 829 } 830 } 831} 832 833 834/* 835 * Check for quiet login, either .hushlogin or command given. 836 */ 837int 838check_quietlogin(Session *s, const char *command) 839{ 840 char buf[256]; 841 struct passwd *pw = s->pw; 842 struct stat st; 843 844 /* Return 1 if .hushlogin exists or a command given. */ 845 if (command != NULL) 846 return 1; 847 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); 848#ifdef HAVE_LOGIN_CAP 849 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) 850 return 1; 851#else 852 if (stat(buf, &st) >= 0) 853 return 1; 854#endif 855 return 0; 856} 857 858/* 859 * Sets the value of the given variable in the environment. If the variable 860 * already exists, its value is overriden. 861 */ 862static void 863child_set_env(char ***envp, u_int *envsizep, const char *name, 864 const char *value) 865{ 866 char **env; 867 u_int envsize; 868 u_int i, namelen; 869 870 /* 871 * Find the slot where the value should be stored. If the variable 872 * already exists, we reuse the slot; otherwise we append a new slot 873 * at the end of the array, expanding if necessary. 874 */ 875 env = *envp; 876 namelen = strlen(name); 877 for (i = 0; env[i]; i++) 878 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') 879 break; 880 if (env[i]) { 881 /* Reuse the slot. */ 882 xfree(env[i]); 883 } else { 884 /* New variable. Expand if necessary. */ 885 envsize = *envsizep; 886 if (i >= envsize - 1) { 887 if (envsize >= 1000) 888 fatal("child_set_env: too many env vars"); 889 envsize += 50; 890 env = (*envp) = xrealloc(env, envsize * sizeof(char *)); 891 *envsizep = envsize; 892 } 893 /* Need to set the NULL pointer at end of array beyond the new slot. */ 894 env[i + 1] = NULL; 895 } 896 897 /* Allocate space and format the variable in the appropriate slot. */ 898 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); 899 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); 900} 901 902/* 903 * Reads environment variables from the given file and adds/overrides them 904 * into the environment. If the file does not exist, this does nothing. 905 * Otherwise, it must consist of empty lines, comments (line starts with '#') 906 * and assignments of the form name=value. No other forms are allowed. 907 */ 908static void 909read_environment_file(char ***env, u_int *envsize, 910 const char *filename) 911{ 912 FILE *f; 913 char buf[4096]; 914 char *cp, *value; 915 u_int lineno = 0; 916 917 f = fopen(filename, "r"); 918 if (!f) 919 return; 920 921 while (fgets(buf, sizeof(buf), f)) { 922 if (++lineno > 1000) 923 fatal("Too many lines in environment file %s", filename); 924 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) 925 ; 926 if (!*cp || *cp == '#' || *cp == '\n') 927 continue; 928 if (strchr(cp, '\n')) 929 *strchr(cp, '\n') = '\0'; 930 value = strchr(cp, '='); 931 if (value == NULL) { 932 fprintf(stderr, "Bad line %u in %.100s\n", lineno, 933 filename); 934 continue; 935 } 936 /* 937 * Replace the equals sign by nul, and advance value to 938 * the value string. 939 */ 940 *value = '\0'; 941 value++; 942 child_set_env(env, envsize, cp, value); 943 } 944 fclose(f); 945} 946 947void copy_environment(char **source, char ***env, u_int *envsize) 948{ 949 char *var_name, *var_val; 950 int i; 951 952 if (source == NULL) 953 return; 954 955 for(i = 0; source[i] != NULL; i++) { 956 var_name = xstrdup(source[i]); 957 if ((var_val = strstr(var_name, "=")) == NULL) { 958 xfree(var_name); 959 continue; 960 } 961 *var_val++ = '\0'; 962 963 debug3("Copy environment: %s=%s", var_name, var_val); 964 child_set_env(env, envsize, var_name, var_val); 965 966 xfree(var_name); 967 } 968} 969 970static char ** 971do_setup_env(Session *s, const char *shell) 972{ 973 char buf[256]; 974 u_int i, envsize; 975 char **env, *laddr; 976#ifdef HAVE_LOGIN_CAP 977 extern char **environ; 978 char **senv, **var; 979#endif 980 struct passwd *pw = s->pw; 981 982 /* Initialize the environment. */ 983 envsize = 100; 984 env = xmalloc(envsize * sizeof(char *)); 985 env[0] = NULL; 986 987#ifdef HAVE_CYGWIN 988 /* 989 * The Windows environment contains some setting which are 990 * important for a running system. They must not be dropped. 991 */ 992 copy_environment(environ, &env, &envsize); 993#endif 994 995 if (getenv("TZ")) 996 child_set_env(&env, &envsize, "TZ", getenv("TZ")); 997 if (!options.use_login) { 998 /* Set basic environment. */ 999 child_set_env(&env, &envsize, "USER", pw->pw_name); 1000 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); 1001#ifdef _AIX 1002 child_set_env(&env, &envsize, "LOGIN", pw->pw_name); 1003#endif 1004 child_set_env(&env, &envsize, "HOME", pw->pw_dir); 1005 snprintf(buf, sizeof buf, "%.200s/%.50s", 1006 _PATH_MAILDIR, pw->pw_name); 1007 child_set_env(&env, &envsize, "MAIL", buf); 1008#ifdef HAVE_LOGIN_CAP 1009 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); 1010 child_set_env(&env, &envsize, "TERM", "su"); 1011 senv = environ; 1012 environ = xmalloc(sizeof(char *)); 1013 *environ = NULL; 1014 (void) setusercontext(lc, pw, pw->pw_uid, 1015 LOGIN_SETENV|LOGIN_SETPATH); 1016 copy_environment(environ, &env, &envsize); 1017 for (var = environ; *var != NULL; ++var) 1018 xfree(*var); 1019 xfree(environ); 1020 environ = senv; 1021#else /* HAVE_LOGIN_CAP */ 1022# ifndef HAVE_CYGWIN 1023 /* 1024 * There's no standard path on Windows. The path contains 1025 * important components pointing to the system directories, 1026 * needed for loading shared libraries. So the path better 1027 * remains intact here. 1028 */ 1029# ifdef SUPERUSER_PATH 1030 child_set_env(&env, &envsize, "PATH", 1031 s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH); 1032# else 1033 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); 1034# endif /* SUPERUSER_PATH */ 1035# endif /* HAVE_CYGWIN */ 1036#endif /* HAVE_LOGIN_CAP */ 1037 1038 /* Normal systems set SHELL by default. */ 1039 child_set_env(&env, &envsize, "SHELL", shell); 1040 } 1041 1042 /* Set custom environment options from RSA authentication. */ 1043 if (!options.use_login) { 1044 while (custom_environment) { 1045 struct envstring *ce = custom_environment; 1046 char *str = ce->s; 1047 1048 for (i = 0; str[i] != '=' && str[i]; i++) 1049 ; 1050 if (str[i] == '=') { 1051 str[i] = 0; 1052 child_set_env(&env, &envsize, str, str + i + 1); 1053 } 1054 custom_environment = ce->next; 1055 xfree(ce->s); 1056 xfree(ce); 1057 } 1058 } 1059 1060 /* SSH_CLIENT deprecated */ 1061 snprintf(buf, sizeof buf, "%.50s %d %d", 1062 get_remote_ipaddr(), get_remote_port(), get_local_port()); 1063 child_set_env(&env, &envsize, "SSH_CLIENT", buf); 1064 1065 laddr = get_local_ipaddr(packet_get_connection_in()); 1066 snprintf(buf, sizeof buf, "%.50s %d %.50s %d", 1067 get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); 1068 xfree(laddr); 1069 child_set_env(&env, &envsize, "SSH_CONNECTION", buf); 1070 1071 if (s->ttyfd != -1) 1072 child_set_env(&env, &envsize, "SSH_TTY", s->tty); 1073 if (s->term) 1074 child_set_env(&env, &envsize, "TERM", s->term); 1075 if (s->display) 1076 child_set_env(&env, &envsize, "DISPLAY", s->display); 1077 if (original_command) 1078 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", 1079 original_command); 1080 1081#ifdef _UNICOS 1082 if (cray_tmpdir[0] != '\0') 1083 child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); 1084#endif /* _UNICOS */ 1085 1086#ifdef _AIX 1087 { 1088 char *cp; 1089 1090 if ((cp = getenv("AUTHSTATE")) != NULL) 1091 child_set_env(&env, &envsize, "AUTHSTATE", cp); 1092 if ((cp = getenv("KRB5CCNAME")) != NULL) 1093 child_set_env(&env, &envsize, "KRB5CCNAME", cp); 1094 read_environment_file(&env, &envsize, "/etc/environment"); 1095 } 1096#endif 1097#ifdef KRB4 1098 if (s->authctxt->krb4_ticket_file) 1099 child_set_env(&env, &envsize, "KRBTKFILE", 1100 s->authctxt->krb4_ticket_file); 1101#endif 1102#ifdef KRB5 1103 if (s->authctxt->krb5_ticket_file) 1104 child_set_env(&env, &envsize, "KRB5CCNAME", 1105 s->authctxt->krb5_ticket_file); 1106#endif 1107#ifdef USE_PAM 1108 /* 1109 * Pull in any environment variables that may have 1110 * been set by PAM. 1111 */ 1112 { 1113 char **p; 1114 1115 p = fetch_pam_environment(); 1116 copy_environment(p, &env, &envsize); 1117 free_pam_environment(p); 1118 } 1119#endif /* USE_PAM */ 1120 1121 if (auth_sock_name != NULL) 1122 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, 1123 auth_sock_name); 1124 1125 /* read $HOME/.ssh/environment. */ 1126 if (options.permit_user_env && !options.use_login) { 1127 snprintf(buf, sizeof buf, "%.200s/.ssh/environment", 1128 strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); 1129 read_environment_file(&env, &envsize, buf); 1130 } 1131 if (debug_flag) { 1132 /* dump the environment */ 1133 fprintf(stderr, "Environment:\n"); 1134 for (i = 0; env[i]; i++) 1135 fprintf(stderr, " %.200s\n", env[i]); 1136 } 1137 return env; 1138} 1139 1140/* 1141 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found 1142 * first in this order). 1143 */ 1144static void 1145do_rc_files(Session *s, const char *shell) 1146{ 1147 FILE *f = NULL; 1148 char cmd[1024]; 1149 int do_xauth; 1150 struct stat st; 1151 1152 do_xauth = 1153 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; 1154 1155 /* ignore _PATH_SSH_USER_RC for subsystems */ 1156 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { 1157 snprintf(cmd, sizeof cmd, "%s -c '%s %s'", 1158 shell, _PATH_BSHELL, _PATH_SSH_USER_RC); 1159 if (debug_flag) 1160 fprintf(stderr, "Running %s\n", cmd); 1161 f = popen(cmd, "w"); 1162 if (f) { 1163 if (do_xauth) 1164 fprintf(f, "%s %s\n", s->auth_proto, 1165 s->auth_data); 1166 pclose(f); 1167 } else 1168 fprintf(stderr, "Could not run %s\n", 1169 _PATH_SSH_USER_RC); 1170 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { 1171 if (debug_flag) 1172 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, 1173 _PATH_SSH_SYSTEM_RC); 1174 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); 1175 if (f) { 1176 if (do_xauth) 1177 fprintf(f, "%s %s\n", s->auth_proto, 1178 s->auth_data); 1179 pclose(f); 1180 } else 1181 fprintf(stderr, "Could not run %s\n", 1182 _PATH_SSH_SYSTEM_RC); 1183 } else if (do_xauth && options.xauth_location != NULL) { 1184 /* Add authority data to .Xauthority if appropriate. */ 1185 if (debug_flag) { 1186 fprintf(stderr, 1187 "Running %.500s remove %.100s\n", 1188 options.xauth_location, s->auth_display); 1189 fprintf(stderr, 1190 "%.500s add %.100s %.100s %.100s\n", 1191 options.xauth_location, s->auth_display, 1192 s->auth_proto, s->auth_data); 1193 } 1194 snprintf(cmd, sizeof cmd, "%s -q -", 1195 options.xauth_location); 1196 f = popen(cmd, "w"); 1197 if (f) { 1198 fprintf(f, "remove %s\n", 1199 s->auth_display); 1200 fprintf(f, "add %s %s %s\n", 1201 s->auth_display, s->auth_proto, 1202 s->auth_data); 1203 pclose(f); 1204 } else { 1205 fprintf(stderr, "Could not run %s\n", 1206 cmd); 1207 } 1208 } 1209} 1210 1211static void 1212do_nologin(struct passwd *pw) 1213{ 1214 FILE *f = NULL; 1215 char buf[1024]; 1216 1217#ifdef HAVE_LOGIN_CAP 1218 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) 1219 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, 1220 _PATH_NOLOGIN), "r"); 1221#else 1222 if (pw->pw_uid) 1223 f = fopen(_PATH_NOLOGIN, "r"); 1224#endif 1225 if (f) { 1226 /* /etc/nologin exists. Print its contents and exit. */ 1227 log("User %.100s not allowed because %s exists", 1228 pw->pw_name, _PATH_NOLOGIN); 1229 while (fgets(buf, sizeof(buf), f)) 1230 fputs(buf, stderr); 1231 fclose(f); 1232 fflush(NULL); 1233 exit(254); 1234 } 1235} 1236 1237/* Set login name, uid, gid, and groups. */ 1238void 1239do_setusercontext(struct passwd *pw) 1240{ 1241#ifndef HAVE_CYGWIN 1242 if (getuid() == 0 || geteuid() == 0) 1243#endif /* HAVE_CYGWIN */ 1244 { 1245 1246#ifdef HAVE_SETPCRED 1247 setpcred(pw->pw_name); 1248#endif /* HAVE_SETPCRED */ 1249#ifdef HAVE_LOGIN_CAP 1250# ifdef __bsdi__ 1251 setpgid(0, 0); 1252# endif 1253 if (setusercontext(lc, pw, pw->pw_uid, 1254 (LOGIN_SETALL & ~(LOGIN_SETENV|LOGIN_SETPATH))) < 0) { 1255 perror("unable to set user context"); 1256 exit(1); 1257 } 1258#else 1259# if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) 1260 /* Sets login uid for accounting */ 1261 if (getluid() == -1 && setluid(pw->pw_uid) == -1) 1262 error("setluid: %s", strerror(errno)); 1263# endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ 1264 1265 if (setlogin(pw->pw_name) < 0) 1266 error("setlogin failed: %s", strerror(errno)); 1267 if (setgid(pw->pw_gid) < 0) { 1268 perror("setgid"); 1269 exit(1); 1270 } 1271 /* Initialize the group list. */ 1272 if (initgroups(pw->pw_name, pw->pw_gid) < 0) { 1273 perror("initgroups"); 1274 exit(1); 1275 } 1276 endgrent(); 1277# ifdef USE_PAM 1278 /* 1279 * PAM credentials may take the form of supplementary groups. 1280 * These will have been wiped by the above initgroups() call. 1281 * Reestablish them here. 1282 */ 1283 do_pam_setcred(0); 1284# endif /* USE_PAM */ 1285# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) 1286 irix_setusercontext(pw); 1287# endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ 1288# ifdef _AIX 1289 aix_usrinfo(pw); 1290# endif /* _AIX */ 1291 /* Permanently switch to the desired uid. */ 1292 permanently_set_uid(pw); 1293#endif 1294 } 1295 1296#ifdef HAVE_CYGWIN 1297 if (is_winnt) 1298#endif 1299 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) 1300 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); 1301} 1302 1303static void 1304launch_login(struct passwd *pw, const char *hostname) 1305{ 1306 /* Launch login(1). */ 1307 1308 execl(LOGIN_PROGRAM, "login", "-h", hostname, 1309#ifdef xxxLOGIN_NEEDS_TERM 1310 (s->term ? s->term : "unknown"), 1311#endif /* LOGIN_NEEDS_TERM */ 1312#ifdef LOGIN_NO_ENDOPT 1313 "-p", "-f", pw->pw_name, (char *)NULL); 1314#else 1315 "-p", "-f", "--", pw->pw_name, (char *)NULL); 1316#endif 1317 1318 /* Login couldn't be executed, die. */ 1319 1320 perror("login"); 1321 exit(1); 1322} 1323 1324/* 1325 * Performs common processing for the child, such as setting up the 1326 * environment, closing extra file descriptors, setting the user and group 1327 * ids, and executing the command or shell. 1328 */ 1329void 1330do_child(Session *s, const char *command) 1331{ 1332 extern char **environ; 1333 char **env; 1334 char *argv[10]; 1335 const char *shell, *shell0, *hostname = NULL; 1336 struct passwd *pw = s->pw; 1337 u_int i; 1338#ifdef HAVE_LOGIN_CAP 1339 int lc_requirehome; 1340#endif 1341 1342 /* remove hostkey from the child's memory */ 1343 destroy_sensitive_data(); 1344 1345 /* login(1) is only called if we execute the login shell */ 1346 if (options.use_login && command != NULL) 1347 options.use_login = 0; 1348 1349#ifdef _UNICOS 1350 cray_setup(pw->pw_uid, pw->pw_name, command); 1351#endif /* _UNICOS */ 1352 1353 /* 1354 * Login(1) does this as well, and it needs uid 0 for the "-h" 1355 * switch, so we let login(1) to this for us. 1356 */ 1357 if (!options.use_login) { 1358#ifdef HAVE_OSF_SIA 1359 session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); 1360 if (!check_quietlogin(s, command)) 1361 do_motd(); 1362#else /* HAVE_OSF_SIA */ 1363 do_nologin(pw); 1364 do_setusercontext(pw); 1365#endif /* HAVE_OSF_SIA */ 1366 } 1367 1368 /* 1369 * Get the shell from the password data. An empty shell field is 1370 * legal, and means /bin/sh. 1371 */ 1372 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; 1373 1374 /* 1375 * Make sure $SHELL points to the shell from the password file, 1376 * even if shell is overridden from login.conf 1377 */ 1378 env = do_setup_env(s, shell); 1379 1380#ifdef HAVE_LOGIN_CAP 1381 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); 1382#endif 1383 1384 /* we have to stash the hostname before we close our socket. */ 1385 if (options.use_login) 1386 hostname = get_remote_name_or_ip(utmp_len, 1387 options.verify_reverse_mapping); 1388 /* 1389 * Close the connection descriptors; note that this is the child, and 1390 * the server will still have the socket open, and it is important 1391 * that we do not shutdown it. Note that the descriptors cannot be 1392 * closed before building the environment, as we call 1393 * get_remote_ipaddr there. 1394 */ 1395 if (packet_get_connection_in() == packet_get_connection_out()) 1396 close(packet_get_connection_in()); 1397 else { 1398 close(packet_get_connection_in()); 1399 close(packet_get_connection_out()); 1400 } 1401 /* 1402 * Close all descriptors related to channels. They will still remain 1403 * open in the parent. 1404 */ 1405 /* XXX better use close-on-exec? -markus */ 1406 channel_close_all(); 1407 1408#ifdef HAVE_LOGIN_CAP 1409 lc_requirehome = login_getcapbool(lc, "requirehome", 0); 1410 login_close(lc); 1411#endif 1412 /* 1413 * Close any extra file descriptors. Note that there may still be 1414 * descriptors left by system functions. They will be closed later. 1415 */ 1416 endpwent(); 1417 1418 /* 1419 * Close any extra open file descriptors so that we don\'t have them 1420 * hanging around in clients. Note that we want to do this after 1421 * initgroups, because at least on Solaris 2.3 it leaves file 1422 * descriptors open. 1423 */ 1424 for (i = 3; i < 64; i++) 1425 close(i); 1426 1427 /* 1428 * Must take new environment into use so that .ssh/rc, 1429 * /etc/ssh/sshrc and xauth are run in the proper environment. 1430 */ 1431 environ = env; 1432 1433#ifdef AFS 1434 /* Try to get AFS tokens for the local cell. */ 1435 if (k_hasafs()) { 1436 char cell[64]; 1437 1438 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) 1439 krb_afslog(cell, 0); 1440 1441 krb_afslog(0, 0); 1442 } 1443#endif /* AFS */ 1444 1445 /* Change current directory to the user\'s home directory. */ 1446 if (chdir(pw->pw_dir) < 0) { 1447 fprintf(stderr, "Could not chdir to home directory %s: %s\n", 1448 pw->pw_dir, strerror(errno)); 1449#ifdef HAVE_LOGIN_CAP 1450 if (lc_requirehome) 1451 exit(1); 1452#endif 1453 } 1454 1455 if (!options.use_login) 1456 do_rc_files(s, shell); 1457 1458 /* restore SIGPIPE for child */ 1459 signal(SIGPIPE, SIG_DFL); 1460 1461 if (options.use_login) { 1462 launch_login(pw, hostname); 1463 /* NEVERREACHED */ 1464 } 1465 1466 /* Get the last component of the shell name. */ 1467 if ((shell0 = strrchr(shell, '/')) != NULL) 1468 shell0++; 1469 else 1470 shell0 = shell; 1471 1472 /* 1473 * If we have no command, execute the shell. In this case, the shell 1474 * name to be passed in argv[0] is preceded by '-' to indicate that 1475 * this is a login shell. 1476 */ 1477 if (!command) { 1478 char argv0[256]; 1479 1480 /* Start the shell. Set initial character to '-'. */ 1481 argv0[0] = '-'; 1482 1483 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) 1484 >= sizeof(argv0) - 1) { 1485 errno = EINVAL; 1486 perror(shell); 1487 exit(1); 1488 } 1489 1490 /* Execute the shell. */ 1491 argv[0] = argv0; 1492 argv[1] = NULL; 1493 execve(shell, argv, env); 1494 1495 /* Executing the shell failed. */ 1496 perror(shell); 1497 exit(1); 1498 } 1499 /* 1500 * Execute the command using the user's shell. This uses the -c 1501 * option to execute the command. 1502 */ 1503 argv[0] = (char *) shell0; 1504 argv[1] = "-c"; 1505 argv[2] = (char *) command; 1506 argv[3] = NULL; 1507 execve(shell, argv, env); 1508 perror(shell); 1509 exit(1); 1510} 1511 1512Session * 1513session_new(void) 1514{ 1515 int i; 1516 static int did_init = 0; 1517 if (!did_init) { 1518 debug("session_new: init"); 1519 for (i = 0; i < MAX_SESSIONS; i++) { 1520 sessions[i].used = 0; 1521 } 1522 did_init = 1; 1523 } 1524 for (i = 0; i < MAX_SESSIONS; i++) { 1525 Session *s = &sessions[i]; 1526 if (! s->used) { 1527 memset(s, 0, sizeof(*s)); 1528 s->chanid = -1; 1529 s->ptyfd = -1; 1530 s->ttyfd = -1; 1531 s->used = 1; 1532 s->self = i; 1533 debug("session_new: session %d", i); 1534 return s; 1535 } 1536 } 1537 return NULL; 1538} 1539 1540static void 1541session_dump(void) 1542{ 1543 int i; 1544 for (i = 0; i < MAX_SESSIONS; i++) { 1545 Session *s = &sessions[i]; 1546 debug("dump: used %d session %d %p channel %d pid %ld", 1547 s->used, 1548 s->self, 1549 s, 1550 s->chanid, 1551 (long)s->pid); 1552 } 1553} 1554 1555int 1556session_open(Authctxt *authctxt, int chanid) 1557{ 1558 Session *s = session_new(); 1559 debug("session_open: channel %d", chanid); 1560 if (s == NULL) { 1561 error("no more sessions"); 1562 return 0; 1563 } 1564 s->authctxt = authctxt; 1565 s->pw = authctxt->pw; 1566 if (s->pw == NULL) 1567 fatal("no user for session %d", s->self); 1568 debug("session_open: session %d: link with channel %d", s->self, chanid); 1569 s->chanid = chanid; 1570 return 1; 1571} 1572 1573Session * 1574session_by_tty(char *tty) 1575{ 1576 int i; 1577 for (i = 0; i < MAX_SESSIONS; i++) { 1578 Session *s = &sessions[i]; 1579 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { 1580 debug("session_by_tty: session %d tty %s", i, tty); 1581 return s; 1582 } 1583 } 1584 debug("session_by_tty: unknown tty %.100s", tty); 1585 session_dump(); 1586 return NULL; 1587} 1588 1589static Session * 1590session_by_channel(int id) 1591{ 1592 int i; 1593 for (i = 0; i < MAX_SESSIONS; i++) { 1594 Session *s = &sessions[i]; 1595 if (s->used && s->chanid == id) { 1596 debug("session_by_channel: session %d channel %d", i, id); 1597 return s; 1598 } 1599 } 1600 debug("session_by_channel: unknown channel %d", id); 1601 session_dump(); 1602 return NULL; 1603} 1604 1605static Session * 1606session_by_pid(pid_t pid) 1607{ 1608 int i; 1609 debug("session_by_pid: pid %ld", (long)pid); 1610 for (i = 0; i < MAX_SESSIONS; i++) { 1611 Session *s = &sessions[i]; 1612 if (s->used && s->pid == pid) 1613 return s; 1614 } 1615 error("session_by_pid: unknown pid %ld", (long)pid); 1616 session_dump(); 1617 return NULL; 1618} 1619 1620static int 1621session_window_change_req(Session *s) 1622{ 1623 s->col = packet_get_int(); 1624 s->row = packet_get_int(); 1625 s->xpixel = packet_get_int(); 1626 s->ypixel = packet_get_int(); 1627 packet_check_eom(); 1628 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); 1629 return 1; 1630} 1631 1632static int 1633session_pty_req(Session *s) 1634{ 1635 u_int len; 1636 int n_bytes; 1637 1638 if (no_pty_flag) { 1639 debug("Allocating a pty not permitted for this authentication."); 1640 return 0; 1641 } 1642 if (s->ttyfd != -1) { 1643 packet_disconnect("Protocol error: you already have a pty."); 1644 return 0; 1645 } 1646 /* Get the time and hostname when the user last logged in. */ 1647 if (options.print_lastlog) { 1648 s->hostname[0] = '\0'; 1649 s->last_login_time = get_last_login_time(s->pw->pw_uid, 1650 s->pw->pw_name, s->hostname, sizeof(s->hostname)); 1651 } 1652 1653 s->term = packet_get_string(&len); 1654 1655 if (compat20) { 1656 s->col = packet_get_int(); 1657 s->row = packet_get_int(); 1658 } else { 1659 s->row = packet_get_int(); 1660 s->col = packet_get_int(); 1661 } 1662 s->xpixel = packet_get_int(); 1663 s->ypixel = packet_get_int(); 1664 1665 if (strcmp(s->term, "") == 0) { 1666 xfree(s->term); 1667 s->term = NULL; 1668 } 1669 1670 /* Allocate a pty and open it. */ 1671 debug("Allocating pty."); 1672 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { 1673 if (s->term) 1674 xfree(s->term); 1675 s->term = NULL; 1676 s->ptyfd = -1; 1677 s->ttyfd = -1; 1678 error("session_pty_req: session %d alloc failed", s->self); 1679 return 0; 1680 } 1681 debug("session_pty_req: session %d alloc %s", s->self, s->tty); 1682 1683 /* for SSH1 the tty modes length is not given */ 1684 if (!compat20) 1685 n_bytes = packet_remaining(); 1686 tty_parse_modes(s->ttyfd, &n_bytes); 1687 1688 /* 1689 * Add a cleanup function to clear the utmp entry and record logout 1690 * time in case we call fatal() (e.g., the connection gets closed). 1691 */ 1692 fatal_add_cleanup(session_pty_cleanup, (void *)s); 1693 if (!use_privsep) 1694 pty_setowner(s->pw, s->tty); 1695 1696 /* Set window size from the packet. */ 1697 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); 1698 1699 packet_check_eom(); 1700 session_proctitle(s); 1701 return 1; 1702} 1703 1704static int 1705session_subsystem_req(Session *s) 1706{ 1707 struct stat st; 1708 u_int len; 1709 int success = 0; 1710 char *cmd, *subsys = packet_get_string(&len); 1711 int i; 1712 1713 packet_check_eom(); 1714 log("subsystem request for %.100s", subsys); 1715 1716 for (i = 0; i < options.num_subsystems; i++) { 1717 if (strcmp(subsys, options.subsystem_name[i]) == 0) { 1718 cmd = options.subsystem_command[i]; 1719 if (stat(cmd, &st) < 0) { 1720 error("subsystem: cannot stat %s: %s", cmd, 1721 strerror(errno)); 1722 break; 1723 } 1724 debug("subsystem: exec() %s", cmd); 1725 s->is_subsystem = 1; 1726 do_exec(s, cmd); 1727 success = 1; 1728 break; 1729 } 1730 } 1731 1732 if (!success) 1733 log("subsystem request for %.100s failed, subsystem not found", 1734 subsys); 1735 1736 xfree(subsys); 1737 return success; 1738} 1739 1740static int 1741session_x11_req(Session *s) 1742{ 1743 int success; 1744 1745 s->single_connection = packet_get_char(); 1746 s->auth_proto = packet_get_string(NULL); 1747 s->auth_data = packet_get_string(NULL); 1748 s->screen = packet_get_int(); 1749 packet_check_eom(); 1750 1751 success = session_setup_x11fwd(s); 1752 if (!success) { 1753 xfree(s->auth_proto); 1754 xfree(s->auth_data); 1755 s->auth_proto = NULL; 1756 s->auth_data = NULL; 1757 } 1758 return success; 1759} 1760 1761static int 1762session_shell_req(Session *s) 1763{ 1764 packet_check_eom(); 1765 do_exec(s, NULL); 1766 return 1; 1767} 1768 1769static int 1770session_exec_req(Session *s) 1771{ 1772 u_int len; 1773 char *command = packet_get_string(&len); 1774 packet_check_eom(); 1775 do_exec(s, command); 1776 xfree(command); 1777 return 1; 1778} 1779 1780static int 1781session_auth_agent_req(Session *s) 1782{ 1783 static int called = 0; 1784 packet_check_eom(); 1785 if (no_agent_forwarding_flag) { 1786 debug("session_auth_agent_req: no_agent_forwarding_flag"); 1787 return 0; 1788 } 1789 if (called) { 1790 return 0; 1791 } else { 1792 called = 1; 1793 return auth_input_request_forwarding(s->pw); 1794 } 1795} 1796 1797int 1798session_input_channel_req(Channel *c, const char *rtype) 1799{ 1800 int success = 0; 1801 Session *s; 1802 1803 if ((s = session_by_channel(c->self)) == NULL) { 1804 log("session_input_channel_req: no session %d req %.100s", 1805 c->self, rtype); 1806 return 0; 1807 } 1808 debug("session_input_channel_req: session %d req %s", s->self, rtype); 1809 1810 /* 1811 * a session is in LARVAL state until a shell, a command 1812 * or a subsystem is executed 1813 */ 1814 if (c->type == SSH_CHANNEL_LARVAL) { 1815 if (strcmp(rtype, "shell") == 0) { 1816 success = session_shell_req(s); 1817 } else if (strcmp(rtype, "exec") == 0) { 1818 success = session_exec_req(s); 1819 } else if (strcmp(rtype, "pty-req") == 0) { 1820 success = session_pty_req(s); 1821 } else if (strcmp(rtype, "x11-req") == 0) { 1822 success = session_x11_req(s); 1823 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { 1824 success = session_auth_agent_req(s); 1825 } else if (strcmp(rtype, "subsystem") == 0) { 1826 success = session_subsystem_req(s); 1827 } 1828 } 1829 if (strcmp(rtype, "window-change") == 0) { 1830 success = session_window_change_req(s); 1831 } 1832 return success; 1833} 1834 1835void 1836session_set_fds(Session *s, int fdin, int fdout, int fderr) 1837{ 1838 if (!compat20) 1839 fatal("session_set_fds: called for proto != 2.0"); 1840 /* 1841 * now that have a child and a pipe to the child, 1842 * we can activate our channel and register the fd's 1843 */ 1844 if (s->chanid == -1) 1845 fatal("no channel for session %d", s->self); 1846 channel_set_fds(s->chanid, 1847 fdout, fdin, fderr, 1848 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, 1849 1, 1850 CHAN_SES_WINDOW_DEFAULT); 1851} 1852 1853/* 1854 * Function to perform pty cleanup. Also called if we get aborted abnormally 1855 * (e.g., due to a dropped connection). 1856 */ 1857void 1858session_pty_cleanup2(void *session) 1859{ 1860 Session *s = session; 1861 1862 if (s == NULL) { 1863 error("session_pty_cleanup: no session"); 1864 return; 1865 } 1866 if (s->ttyfd == -1) 1867 return; 1868 1869 debug("session_pty_cleanup: session %d release %s", s->self, s->tty); 1870 1871 /* Record that the user has logged out. */ 1872 if (s->pid != 0) 1873 record_logout(s->pid, s->tty, s->pw->pw_name); 1874 1875 /* Release the pseudo-tty. */ 1876 if (getuid() == 0) 1877 pty_release(s->tty); 1878 1879 /* 1880 * Close the server side of the socket pairs. We must do this after 1881 * the pty cleanup, so that another process doesn't get this pty 1882 * while we're still cleaning up. 1883 */ 1884 if (close(s->ptymaster) < 0) 1885 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); 1886 1887 /* unlink pty from session */ 1888 s->ttyfd = -1; 1889} 1890 1891void 1892session_pty_cleanup(void *session) 1893{ 1894 PRIVSEP(session_pty_cleanup2(session)); 1895} 1896 1897static char * 1898sig2name(int sig) 1899{ 1900#define SSH_SIG(x) if (sig == SIG ## x) return #x 1901 SSH_SIG(ABRT); 1902 SSH_SIG(ALRM); 1903 SSH_SIG(FPE); 1904 SSH_SIG(HUP); 1905 SSH_SIG(ILL); 1906 SSH_SIG(INT); 1907 SSH_SIG(KILL); 1908 SSH_SIG(PIPE); 1909 SSH_SIG(QUIT); 1910 SSH_SIG(SEGV); 1911 SSH_SIG(TERM); 1912 SSH_SIG(USR1); 1913 SSH_SIG(USR2); 1914#undef SSH_SIG 1915 return "SIG@openssh.com"; 1916} 1917 1918static void 1919session_exit_message(Session *s, int status) 1920{ 1921 Channel *c; 1922 1923 if ((c = channel_lookup(s->chanid)) == NULL) 1924 fatal("session_exit_message: session %d: no channel %d", 1925 s->self, s->chanid); 1926 debug("session_exit_message: session %d channel %d pid %ld", 1927 s->self, s->chanid, (long)s->pid); 1928 1929 if (WIFEXITED(status)) { 1930 channel_request_start(s->chanid, "exit-status", 0); 1931 packet_put_int(WEXITSTATUS(status)); 1932 packet_send(); 1933 } else if (WIFSIGNALED(status)) { 1934 channel_request_start(s->chanid, "exit-signal", 0); 1935 packet_put_cstring(sig2name(WTERMSIG(status))); 1936#ifdef WCOREDUMP 1937 packet_put_char(WCOREDUMP(status)); 1938#else /* WCOREDUMP */ 1939 packet_put_char(0); 1940#endif /* WCOREDUMP */ 1941 packet_put_cstring(""); 1942 packet_put_cstring(""); 1943 packet_send(); 1944 } else { 1945 /* Some weird exit cause. Just exit. */ 1946 packet_disconnect("wait returned status %04x.", status); 1947 } 1948 1949 /* disconnect channel */ 1950 debug("session_exit_message: release channel %d", s->chanid); 1951 channel_cancel_cleanup(s->chanid); 1952 /* 1953 * emulate a write failure with 'chan_write_failed', nobody will be 1954 * interested in data we write. 1955 * Note that we must not call 'chan_read_failed', since there could 1956 * be some more data waiting in the pipe. 1957 */ 1958 if (c->ostate != CHAN_OUTPUT_CLOSED) 1959 chan_write_failed(c); 1960 s->chanid = -1; 1961} 1962 1963void 1964session_close(Session *s) 1965{ 1966 debug("session_close: session %d pid %ld", s->self, (long)s->pid); 1967 if (s->ttyfd != -1) { 1968 fatal_remove_cleanup(session_pty_cleanup, (void *)s); 1969 session_pty_cleanup(s); 1970 } 1971 if (s->term) 1972 xfree(s->term); 1973 if (s->display) 1974 xfree(s->display); 1975 if (s->auth_display) 1976 xfree(s->auth_display); 1977 if (s->auth_data) 1978 xfree(s->auth_data); 1979 if (s->auth_proto) 1980 xfree(s->auth_proto); 1981 s->used = 0; 1982 session_proctitle(s); 1983} 1984 1985void 1986session_close_by_pid(pid_t pid, int status) 1987{ 1988 Session *s = session_by_pid(pid); 1989 if (s == NULL) { 1990 debug("session_close_by_pid: no session for pid %ld", 1991 (long)pid); 1992 return; 1993 } 1994 if (s->chanid != -1) 1995 session_exit_message(s, status); 1996 session_close(s); 1997} 1998 1999/* 2000 * this is called when a channel dies before 2001 * the session 'child' itself dies 2002 */ 2003void 2004session_close_by_channel(int id, void *arg) 2005{ 2006 Session *s = session_by_channel(id); 2007 if (s == NULL) { 2008 debug("session_close_by_channel: no session for id %d", id); 2009 return; 2010 } 2011 debug("session_close_by_channel: channel %d child %ld", 2012 id, (long)s->pid); 2013 if (s->pid != 0) { 2014 debug("session_close_by_channel: channel %d: has child", id); 2015 /* 2016 * delay detach of session, but release pty, since 2017 * the fd's to the child are already closed 2018 */ 2019 if (s->ttyfd != -1) { 2020 fatal_remove_cleanup(session_pty_cleanup, (void *)s); 2021 session_pty_cleanup(s); 2022 } 2023 return; 2024 } 2025 /* detach by removing callback */ 2026 channel_cancel_cleanup(s->chanid); 2027 s->chanid = -1; 2028 session_close(s); 2029} 2030 2031void 2032session_destroy_all(void (*closefunc)(Session *)) 2033{ 2034 int i; 2035 for (i = 0; i < MAX_SESSIONS; i++) { 2036 Session *s = &sessions[i]; 2037 if (s->used) { 2038 if (closefunc != NULL) 2039 closefunc(s); 2040 else 2041 session_close(s); 2042 } 2043 } 2044} 2045 2046static char * 2047session_tty_list(void) 2048{ 2049 static char buf[1024]; 2050 int i; 2051 char *cp; 2052 2053 buf[0] = '\0'; 2054 for (i = 0; i < MAX_SESSIONS; i++) { 2055 Session *s = &sessions[i]; 2056 if (s->used && s->ttyfd != -1) { 2057 2058 if (strncmp(s->tty, "/dev/", 5) != 0) { 2059 cp = strrchr(s->tty, '/'); 2060 cp = (cp == NULL) ? s->tty : cp + 1; 2061 } else 2062 cp = s->tty + 5; 2063 2064 if (buf[0] != '\0') 2065 strlcat(buf, ",", sizeof buf); 2066 strlcat(buf, cp, sizeof buf); 2067 } 2068 } 2069 if (buf[0] == '\0') 2070 strlcpy(buf, "notty", sizeof buf); 2071 return buf; 2072} 2073 2074void 2075session_proctitle(Session *s) 2076{ 2077 if (s->pw == NULL) 2078 error("no user for session %d", s->self); 2079 else 2080 setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); 2081} 2082 2083int 2084session_setup_x11fwd(Session *s) 2085{ 2086 struct stat st; 2087 char display[512], auth_display[512]; 2088 char hostname[MAXHOSTNAMELEN]; 2089 2090 if (no_x11_forwarding_flag) { 2091 packet_send_debug("X11 forwarding disabled in user configuration file."); 2092 return 0; 2093 } 2094 if (!options.x11_forwarding) { 2095 debug("X11 forwarding disabled in server configuration file."); 2096 return 0; 2097 } 2098 if (!options.xauth_location || 2099 (stat(options.xauth_location, &st) == -1)) { 2100 packet_send_debug("No xauth program; cannot forward with spoofing."); 2101 return 0; 2102 } 2103 if (options.use_login) { 2104 packet_send_debug("X11 forwarding disabled; " 2105 "not compatible with UseLogin=yes."); 2106 return 0; 2107 } 2108 if (s->display != NULL) { 2109 debug("X11 display already set."); 2110 return 0; 2111 } 2112 if (x11_create_display_inet(options.x11_display_offset, 2113 options.x11_use_localhost, s->single_connection, 2114 &s->display_number) == -1) { 2115 debug("x11_create_display_inet failed."); 2116 return 0; 2117 } 2118 2119 /* Set up a suitable value for the DISPLAY variable. */ 2120 if (gethostname(hostname, sizeof(hostname)) < 0) 2121 fatal("gethostname: %.100s", strerror(errno)); 2122 /* 2123 * auth_display must be used as the displayname when the 2124 * authorization entry is added with xauth(1). This will be 2125 * different than the DISPLAY string for localhost displays. 2126 */ 2127 if (options.x11_use_localhost) { 2128 snprintf(display, sizeof display, "localhost:%u.%u", 2129 s->display_number, s->screen); 2130 snprintf(auth_display, sizeof auth_display, "unix:%u.%u", 2131 s->display_number, s->screen); 2132 s->display = xstrdup(display); 2133 s->auth_display = xstrdup(auth_display); 2134 } else { 2135#ifdef IPADDR_IN_DISPLAY 2136 struct hostent *he; 2137 struct in_addr my_addr; 2138 2139 he = gethostbyname(hostname); 2140 if (he == NULL) { 2141 error("Can't get IP address for X11 DISPLAY."); 2142 packet_send_debug("Can't get IP address for X11 DISPLAY."); 2143 return 0; 2144 } 2145 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); 2146 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), 2147 s->display_number, s->screen); 2148#else 2149 snprintf(display, sizeof display, "%.400s:%u.%u", hostname, 2150 s->display_number, s->screen); 2151#endif 2152 s->display = xstrdup(display); 2153 s->auth_display = xstrdup(display); 2154 } 2155 2156 return 1; 2157} 2158 2159static void 2160do_authenticated2(Authctxt *authctxt) 2161{ 2162 server_loop2(authctxt); 2163} 2164