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" 36 RCSID("$OpenBSD: session.c,v 1.150 2002/09/16 19:55:33 stevesk Exp $"); 37 RCSID("$FreeBSD: src/crypto/openssh/session.c,v 1.4.2.17 2003/02/03 17:31:07 des Exp $"); 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 70 Session *session_new(void); 71 void session_set_fds(Session *, int, int, int); 72 void session_pty_cleanup(void *); 73 void session_proctitle(Session *); 74 int session_setup_x11fwd(Session *); 75 void do_exec_pty(Session *, const char *); 76 void do_exec_no_pty(Session *, const char *); 77 void do_exec(Session *, const char *); 78 void do_login(Session *, const char *); 79 #ifdef LOGIN_NEEDS_UTMPX 80 static void do_pre_login(Session *s); 81 #endif 82 void do_child(Session *, const char *); 83 void do_motd(void); 84 int check_quietlogin(Session *, const char *); 85 86 static void do_authenticated1(Authctxt *); 87 static void do_authenticated2(Authctxt *); 88 89 static int session_pty_req(Session *); 90 91 /* import */ 92 extern ServerOptions options; 93 extern char *__progname; 94 extern int log_stderr; 95 extern int debug_flag; 96 extern u_int utmp_len; 97 extern int startup_pipe; 98 extern void destroy_sensitive_data(void); 99 100 /* original command from peer. */ 101 const char *original_command = NULL; 102 103 /* data */ 104 #define MAX_SESSIONS 10 105 Session sessions[MAX_SESSIONS]; 106 107 #ifdef WITH_AIXAUTHENTICATE 108 char *aixloginmsg; 109 #endif /* WITH_AIXAUTHENTICATE */ 110 111 #ifdef HAVE_LOGIN_CAP 112 login_cap_t *lc; 113 #endif 114 115 /* Name and directory of socket for authentication agent forwarding. */ 116 static char *auth_sock_name = NULL; 117 static char *auth_sock_dir = NULL; 118 119 /* removes the agent forwarding socket */ 120 121 static void 122 auth_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 } 134 135 static int 136 auth_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 } 200 201 202 void 203 do_authenticated(Authctxt *authctxt) 204 { 205 /* 206 * Cancel the alarm we set to limit the time taken for 207 * authentication. 208 */ 209 alarm(0); 210 if (startup_pipe != -1) { 211 close(startup_pipe); 212 startup_pipe = -1; 213 } 214 215 /* setup the channel layer */ 216 if (!no_port_forwarding_flag && options.allow_tcp_forwarding) 217 channel_permit_all_opens(); 218 219 if (compat20) 220 do_authenticated2(authctxt); 221 else 222 do_authenticated1(authctxt); 223 224 /* remove agent socket */ 225 if (auth_sock_name != NULL) 226 auth_sock_cleanup_proc(authctxt->pw); 227 #ifdef KRB4 228 if (options.kerberos_ticket_cleanup) 229 krb4_cleanup_proc(authctxt); 230 #endif 231 #ifdef KRB5 232 if (options.kerberos_ticket_cleanup) 233 krb5_cleanup_proc(authctxt); 234 #endif 235 } 236 237 /* 238 * Prepares for an interactive session. This is called after the user has 239 * been successfully authenticated. During this message exchange, pseudo 240 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings 241 * are requested, etc. 242 */ 243 static void 244 do_authenticated1(Authctxt *authctxt) 245 { 246 Session *s; 247 char *command; 248 int success, type, screen_flag; 249 int enable_compression_after_reply = 0; 250 u_int proto_len, data_len, dlen, compression_level = 0; 251 252 s = session_new(); 253 s->authctxt = authctxt; 254 s->pw = authctxt->pw; 255 256 /* 257 * We stay in this loop until the client requests to execute a shell 258 * or a command. 259 */ 260 for (;;) { 261 success = 0; 262 263 /* Get a packet from the client. */ 264 type = packet_read(); 265 266 /* Process the packet. */ 267 switch (type) { 268 case SSH_CMSG_REQUEST_COMPRESSION: 269 compression_level = packet_get_int(); 270 packet_check_eom(); 271 if (compression_level < 1 || compression_level > 9) { 272 packet_send_debug("Received illegal compression level %d.", 273 compression_level); 274 break; 275 } 276 if (!options.compression) { 277 debug2("compression disabled"); 278 break; 279 } 280 /* Enable compression after we have responded with SUCCESS. */ 281 enable_compression_after_reply = 1; 282 success = 1; 283 break; 284 285 case SSH_CMSG_REQUEST_PTY: 286 success = session_pty_req(s); 287 break; 288 289 case SSH_CMSG_X11_REQUEST_FORWARDING: 290 s->auth_proto = packet_get_string(&proto_len); 291 s->auth_data = packet_get_string(&data_len); 292 293 screen_flag = packet_get_protocol_flags() & 294 SSH_PROTOFLAG_SCREEN_NUMBER; 295 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); 296 297 if (packet_remaining() == 4) { 298 if (!screen_flag) 299 debug2("Buggy client: " 300 "X11 screen flag missing"); 301 s->screen = packet_get_int(); 302 } else { 303 s->screen = 0; 304 } 305 packet_check_eom(); 306 success = session_setup_x11fwd(s); 307 if (!success) { 308 xfree(s->auth_proto); 309 xfree(s->auth_data); 310 s->auth_proto = NULL; 311 s->auth_data = NULL; 312 } 313 break; 314 315 case SSH_CMSG_AGENT_REQUEST_FORWARDING: 316 if (no_agent_forwarding_flag || compat13) { 317 debug("Authentication agent forwarding not permitted for this authentication."); 318 break; 319 } 320 debug("Received authentication agent forwarding request."); 321 success = auth_input_request_forwarding(s->pw); 322 break; 323 324 case SSH_CMSG_PORT_FORWARD_REQUEST: 325 if (no_port_forwarding_flag) { 326 debug("Port forwarding not permitted for this authentication."); 327 break; 328 } 329 if (!options.allow_tcp_forwarding) { 330 debug("Port forwarding not permitted."); 331 break; 332 } 333 debug("Received TCP/IP port forwarding request."); 334 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); 335 success = 1; 336 break; 337 338 case SSH_CMSG_MAX_PACKET_SIZE: 339 if (packet_set_maxsize(packet_get_int()) > 0) 340 success = 1; 341 break; 342 343 #if defined(AFS) || defined(KRB5) 344 case SSH_CMSG_HAVE_KERBEROS_TGT: 345 if (!options.kerberos_tgt_passing) { 346 verbose("Kerberos TGT passing disabled."); 347 } else { 348 char *kdata = packet_get_string(&dlen); 349 packet_check_eom(); 350 351 /* XXX - 0x41, see creds_to_radix version */ 352 if (kdata[0] != 0x41) { 353 #ifdef KRB5 354 krb5_data tgt; 355 tgt.data = kdata; 356 tgt.length = dlen; 357 358 if (auth_krb5_tgt(s->authctxt, &tgt)) 359 success = 1; 360 else 361 verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user); 362 #endif /* KRB5 */ 363 } else { 364 #ifdef AFS 365 if (auth_krb4_tgt(s->authctxt, kdata)) 366 success = 1; 367 else 368 verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user); 369 #endif /* AFS */ 370 } 371 xfree(kdata); 372 } 373 break; 374 #endif /* AFS || KRB5 */ 375 376 #ifdef AFS 377 case SSH_CMSG_HAVE_AFS_TOKEN: 378 if (!options.afs_token_passing || !k_hasafs()) { 379 verbose("AFS token passing disabled."); 380 } else { 381 /* Accept AFS token. */ 382 char *token = packet_get_string(&dlen); 383 packet_check_eom(); 384 385 if (auth_afs_token(s->authctxt, token)) 386 success = 1; 387 else 388 verbose("AFS token refused for %.100s", 389 s->authctxt->user); 390 xfree(token); 391 } 392 break; 393 #endif /* AFS */ 394 395 case SSH_CMSG_EXEC_SHELL: 396 case SSH_CMSG_EXEC_CMD: 397 if (type == SSH_CMSG_EXEC_CMD) { 398 command = packet_get_string(&dlen); 399 debug("Exec command '%.500s'", command); 400 do_exec(s, command); 401 xfree(command); 402 } else { 403 do_exec(s, NULL); 404 } 405 packet_check_eom(); 406 session_close(s); 407 return; 408 409 default: 410 /* 411 * Any unknown messages in this phase are ignored, 412 * and a failure message is returned. 413 */ 414 log("Unknown packet type received after authentication: %d", type); 415 } 416 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); 417 packet_send(); 418 packet_write_wait(); 419 420 /* Enable compression now that we have replied if appropriate. */ 421 if (enable_compression_after_reply) { 422 enable_compression_after_reply = 0; 423 packet_start_compression(compression_level); 424 } 425 } 426 } 427 428 /* 429 * This is called to fork and execute a command when we have no tty. This 430 * will call do_child from the child, and server_loop from the parent after 431 * setting up file descriptors and such. 432 */ 433 void 434 do_exec_no_pty(Session *s, const char *command) 435 { 436 pid_t pid; 437 438 #ifdef USE_PIPES 439 int pin[2], pout[2], perr[2]; 440 /* Allocate pipes for communicating with the program. */ 441 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) 442 packet_disconnect("Could not create pipes: %.100s", 443 strerror(errno)); 444 #else /* USE_PIPES */ 445 int inout[2], err[2]; 446 /* Uses socket pairs to communicate with the program. */ 447 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || 448 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) 449 packet_disconnect("Could not create socket pairs: %.100s", 450 strerror(errno)); 451 #endif /* USE_PIPES */ 452 if (s == NULL) 453 fatal("do_exec_no_pty: no session"); 454 455 session_proctitle(s); 456 457 #if defined(USE_PAM) 458 do_pam_session(s->pw->pw_name, NULL); 459 do_pam_setcred(1); 460 if (is_pam_password_change_required()) 461 packet_disconnect("Password change required but no " 462 "TTY available"); 463 #endif /* USE_PAM */ 464 465 /* Fork the child. */ 466 if ((pid = fork()) == 0) { 467 fatal_remove_all_cleanups(); 468 469 /* Child. Reinitialize the log since the pid has changed. */ 470 log_init(__progname, options.log_level, options.log_facility, log_stderr); 471 472 /* 473 * Create a new session and process group since the 4.4BSD 474 * setlogin() affects the entire process group. 475 */ 476 if (setsid() < 0) 477 error("setsid failed: %.100s", strerror(errno)); 478 479 #ifdef USE_PIPES 480 /* 481 * Redirect stdin. We close the parent side of the socket 482 * pair, and make the child side the standard input. 483 */ 484 close(pin[1]); 485 if (dup2(pin[0], 0) < 0) 486 perror("dup2 stdin"); 487 close(pin[0]); 488 489 /* Redirect stdout. */ 490 close(pout[0]); 491 if (dup2(pout[1], 1) < 0) 492 perror("dup2 stdout"); 493 close(pout[1]); 494 495 /* Redirect stderr. */ 496 close(perr[0]); 497 if (dup2(perr[1], 2) < 0) 498 perror("dup2 stderr"); 499 close(perr[1]); 500 #else /* USE_PIPES */ 501 /* 502 * Redirect stdin, stdout, and stderr. Stdin and stdout will 503 * use the same socket, as some programs (particularly rdist) 504 * seem to depend on it. 505 */ 506 close(inout[1]); 507 close(err[1]); 508 if (dup2(inout[0], 0) < 0) /* stdin */ 509 perror("dup2 stdin"); 510 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ 511 perror("dup2 stdout"); 512 if (dup2(err[0], 2) < 0) /* stderr */ 513 perror("dup2 stderr"); 514 #endif /* USE_PIPES */ 515 516 #ifdef _UNICOS 517 cray_init_job(s->pw); /* set up cray jid and tmpdir */ 518 #endif 519 520 /* Do processing for the child (exec command etc). */ 521 do_child(s, command); 522 /* NOTREACHED */ 523 } 524 #ifdef _UNICOS 525 signal(WJSIGNAL, cray_job_termination_handler); 526 #endif /* _UNICOS */ 527 #ifdef HAVE_CYGWIN 528 if (is_winnt) 529 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); 530 #endif 531 if (pid < 0) 532 packet_disconnect("fork failed: %.100s", strerror(errno)); 533 s->pid = pid; 534 /* Set interactive/non-interactive mode. */ 535 packet_set_interactive(s->display != NULL); 536 #ifdef USE_PIPES 537 /* We are the parent. Close the child sides of the pipes. */ 538 close(pin[0]); 539 close(pout[1]); 540 close(perr[1]); 541 542 if (compat20) { 543 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); 544 } else { 545 /* Enter the interactive session. */ 546 server_loop(pid, pin[1], pout[0], perr[0]); 547 /* server_loop has closed pin[1], pout[0], and perr[0]. */ 548 } 549 #else /* USE_PIPES */ 550 /* We are the parent. Close the child sides of the socket pairs. */ 551 close(inout[0]); 552 close(err[0]); 553 554 /* 555 * Enter the interactive session. Note: server_loop must be able to 556 * handle the case that fdin and fdout are the same. 557 */ 558 if (compat20) { 559 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); 560 } else { 561 server_loop(pid, inout[1], inout[1], err[1]); 562 /* server_loop has closed inout[1] and err[1]. */ 563 } 564 #endif /* USE_PIPES */ 565 } 566 567 /* 568 * This is called to fork and execute a command when we have a tty. This 569 * will call do_child from the child, and server_loop from the parent after 570 * setting up file descriptors, controlling tty, updating wtmp, utmp, 571 * lastlog, and other such operations. 572 */ 573 void 574 do_exec_pty(Session *s, const char *command) 575 { 576 int fdout, ptyfd, ttyfd, ptymaster; 577 pid_t pid; 578 579 if (s == NULL) 580 fatal("do_exec_pty: no session"); 581 ptyfd = s->ptyfd; 582 ttyfd = s->ttyfd; 583 584 #if defined(USE_PAM) 585 do_pam_session(s->pw->pw_name, s->tty); 586 do_pam_setcred(1); 587 #endif 588 589 /* Fork the child. */ 590 if ((pid = fork()) == 0) { 591 fatal_remove_all_cleanups(); 592 593 /* Child. Reinitialize the log because the pid has changed. */ 594 log_init(__progname, options.log_level, options.log_facility, log_stderr); 595 /* Close the master side of the pseudo tty. */ 596 close(ptyfd); 597 598 /* Make the pseudo tty our controlling tty. */ 599 pty_make_controlling_tty(&ttyfd, s->tty); 600 601 /* Redirect stdin/stdout/stderr from the pseudo tty. */ 602 if (dup2(ttyfd, 0) < 0) 603 error("dup2 stdin: %s", strerror(errno)); 604 if (dup2(ttyfd, 1) < 0) 605 error("dup2 stdout: %s", strerror(errno)); 606 if (dup2(ttyfd, 2) < 0) 607 error("dup2 stderr: %s", strerror(errno)); 608 609 /* Close the extra descriptor for the pseudo tty. */ 610 close(ttyfd); 611 612 /* record login, etc. similar to login(1) */ 613 #ifndef HAVE_OSF_SIA 614 if (!(options.use_login && command == NULL)) { 615 #ifdef _UNICOS 616 cray_init_job(s->pw); /* set up cray jid and tmpdir */ 617 #endif /* _UNICOS */ 618 do_login(s, command); 619 } 620 # ifdef LOGIN_NEEDS_UTMPX 621 else 622 do_pre_login(s); 623 # endif 624 #endif 625 626 /* Do common processing for the child, such as execing the command. */ 627 do_child(s, command); 628 /* NOTREACHED */ 629 } 630 #ifdef _UNICOS 631 signal(WJSIGNAL, cray_job_termination_handler); 632 #endif /* _UNICOS */ 633 #ifdef HAVE_CYGWIN 634 if (is_winnt) 635 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); 636 #endif 637 if (pid < 0) 638 packet_disconnect("fork failed: %.100s", strerror(errno)); 639 s->pid = pid; 640 641 /* Parent. Close the slave side of the pseudo tty. */ 642 close(ttyfd); 643 644 /* 645 * Create another descriptor of the pty master side for use as the 646 * standard input. We could use the original descriptor, but this 647 * simplifies code in server_loop. The descriptor is bidirectional. 648 */ 649 fdout = dup(ptyfd); 650 if (fdout < 0) 651 packet_disconnect("dup #1 failed: %.100s", strerror(errno)); 652 653 /* we keep a reference to the pty master */ 654 ptymaster = dup(ptyfd); 655 if (ptymaster < 0) 656 packet_disconnect("dup #2 failed: %.100s", strerror(errno)); 657 s->ptymaster = ptymaster; 658 659 /* Enter interactive session. */ 660 packet_set_interactive(1); 661 if (compat20) { 662 session_set_fds(s, ptyfd, fdout, -1); 663 } else { 664 server_loop(pid, ptyfd, fdout, -1); 665 /* server_loop _has_ closed ptyfd and fdout. */ 666 } 667 } 668 669 #ifdef LOGIN_NEEDS_UTMPX 670 static void 671 do_pre_login(Session *s) 672 { 673 socklen_t fromlen; 674 struct sockaddr_storage from; 675 pid_t pid = getpid(); 676 677 /* 678 * Get IP address of client. If the connection is not a socket, let 679 * the address be 0.0.0.0. 680 */ 681 memset(&from, 0, sizeof(from)); 682 fromlen = sizeof(from); 683 if (packet_connection_is_on_socket()) { 684 if (getpeername(packet_get_connection_in(), 685 (struct sockaddr *) & from, &fromlen) < 0) { 686 debug("getpeername: %.100s", strerror(errno)); 687 fatal_cleanup(); 688 } 689 } 690 691 record_utmp_only(pid, s->tty, s->pw->pw_name, 692 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping), 693 (struct sockaddr *)&from, fromlen); 694 } 695 #endif 696 697 /* 698 * This is called to fork and execute a command. If another command is 699 * to be forced, execute that instead. 700 */ 701 void 702 do_exec(Session *s, const char *command) 703 { 704 if (forced_command) { 705 original_command = command; 706 command = forced_command; 707 debug("Forced command '%.900s'", command); 708 } 709 710 if (s->ttyfd != -1) 711 do_exec_pty(s, command); 712 else 713 do_exec_no_pty(s, command); 714 715 original_command = NULL; 716 } 717 718 719 /* administrative, login(1)-like work */ 720 void 721 do_login(Session *s, const char *command) 722 { 723 char *time_string; 724 socklen_t fromlen; 725 struct sockaddr_storage from; 726 struct passwd * pw = s->pw; 727 pid_t pid = getpid(); 728 729 /* 730 * Get IP address of client. If the connection is not a socket, let 731 * the address be 0.0.0.0. 732 */ 733 memset(&from, 0, sizeof(from)); 734 fromlen = sizeof(from); 735 if (packet_connection_is_on_socket()) { 736 if (getpeername(packet_get_connection_in(), 737 (struct sockaddr *) & from, &fromlen) < 0) { 738 debug("getpeername: %.100s", strerror(errno)); 739 fatal_cleanup(); 740 } 741 } 742 743 /* Record that there was a login on that tty from the remote host. */ 744 if (!use_privsep) 745 record_login(pid, s->tty, pw->pw_name, pw->pw_uid, 746 get_remote_name_or_ip(utmp_len, 747 options.verify_reverse_mapping), 748 (struct sockaddr *)&from, fromlen); 749 750 #ifdef USE_PAM 751 /* 752 * If password change is needed, do it now. 753 * This needs to occur before the ~/.hushlogin check. 754 */ 755 if (is_pam_password_change_required()) { 756 print_pam_messages(); 757 do_pam_chauthtok(); 758 } 759 #endif 760 761 if (check_quietlogin(s, command)) 762 return; 763 764 #ifdef USE_PAM 765 if (!is_pam_password_change_required()) 766 print_pam_messages(); 767 #endif /* USE_PAM */ 768 #ifdef WITH_AIXAUTHENTICATE 769 if (aixloginmsg && *aixloginmsg) 770 printf("%s\n", aixloginmsg); 771 #endif /* WITH_AIXAUTHENTICATE */ 772 773 #ifndef NO_SSH_LASTLOG 774 if (options.print_lastlog && s->last_login_time != 0) { 775 time_string = ctime(&s->last_login_time); 776 if (strchr(time_string, '\n')) 777 *strchr(time_string, '\n') = 0; 778 if (strcmp(s->hostname, "") == 0) 779 printf("Last login: %s\r\n", time_string); 780 else 781 printf("Last login: %s from %s\r\n", time_string, 782 s->hostname); 783 } 784 #endif /* NO_SSH_LASTLOG */ 785 786 do_motd(); 787 } 788 789 /* 790 * Display the message of the day. 791 */ 792 void 793 do_motd(void) 794 { 795 FILE *f; 796 char buf[256]; 797 #ifdef HAVE_LOGIN_CAP 798 const char *fname; 799 #endif 800 801 #ifdef HAVE_LOGIN_CAP 802 fname = login_getcapstr(lc, "copyright", NULL, NULL); 803 if (fname != NULL && (f = fopen(fname, "r")) != NULL) { 804 while (fgets(buf, sizeof(buf), f) != NULL) 805 fputs(buf, stdout); 806 fclose(f); 807 } else 808 #endif /* HAVE_LOGIN_CAP */ 809 (void)printf("%s\n\t%s %s\n", 810 "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994", 811 "The Regents of the University of California. ", 812 "All rights reserved."); 813 814 (void)printf("\n"); 815 816 if (options.print_motd) { 817 #ifdef HAVE_LOGIN_CAP 818 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", 819 "/etc/motd"), "r"); 820 #else 821 f = fopen("/etc/motd", "r"); 822 #endif 823 if (f) { 824 while (fgets(buf, sizeof(buf), f)) 825 fputs(buf, stdout); 826 fclose(f); 827 } 828 } 829 } 830 831 832 /* 833 * Check for quiet login, either .hushlogin or command given. 834 */ 835 int 836 check_quietlogin(Session *s, const char *command) 837 { 838 char buf[256]; 839 struct passwd *pw = s->pw; 840 struct stat st; 841 842 /* Return 1 if .hushlogin exists or a command given. */ 843 if (command != NULL) 844 return 1; 845 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); 846 #ifdef HAVE_LOGIN_CAP 847 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) 848 return 1; 849 #else 850 if (stat(buf, &st) >= 0) 851 return 1; 852 #endif 853 return 0; 854 } 855 856 /* 857 * Sets the value of the given variable in the environment. If the variable 858 * already exists, its value is overriden. 859 */ 860 static void 861 child_set_env(char ***envp, u_int *envsizep, const char *name, 862 const char *value) 863 { 864 u_int i, namelen; 865 char **env; 866 867 /* 868 * Find the slot where the value should be stored. If the variable 869 * already exists, we reuse the slot; otherwise we append a new slot 870 * at the end of the array, expanding if necessary. 871 */ 872 env = *envp; 873 namelen = strlen(name); 874 for (i = 0; env[i]; i++) 875 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') 876 break; 877 if (env[i]) { 878 /* Reuse the slot. */ 879 xfree(env[i]); 880 } else { 881 /* New variable. Expand if necessary. */ 882 if (i >= (*envsizep) - 1) { 883 if (*envsizep >= 1000) 884 fatal("child_set_env: too many env vars," 885 " skipping: %.100s", name); 886 (*envsizep) += 50; 887 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); 888 } 889 /* Need to set the NULL pointer at end of array beyond the new slot. */ 890 env[i + 1] = NULL; 891 } 892 893 /* Allocate space and format the variable in the appropriate slot. */ 894 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); 895 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); 896 } 897 898 /* 899 * Reads environment variables from the given file and adds/overrides them 900 * into the environment. If the file does not exist, this does nothing. 901 * Otherwise, it must consist of empty lines, comments (line starts with '#') 902 * and assignments of the form name=value. No other forms are allowed. 903 */ 904 static void 905 read_environment_file(char ***env, u_int *envsize, 906 const char *filename) 907 { 908 FILE *f; 909 char buf[4096]; 910 char *cp, *value; 911 u_int lineno = 0; 912 913 f = fopen(filename, "r"); 914 if (!f) 915 return; 916 917 while (fgets(buf, sizeof(buf), f)) { 918 if (++lineno > 1000) 919 fatal("Too many lines in environment file %s", filename); 920 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) 921 ; 922 if (!*cp || *cp == '#' || *cp == '\n') 923 continue; 924 if (strchr(cp, '\n')) 925 *strchr(cp, '\n') = '\0'; 926 value = strchr(cp, '='); 927 if (value == NULL) { 928 fprintf(stderr, "Bad line %u in %.100s\n", lineno, 929 filename); 930 continue; 931 } 932 /* 933 * Replace the equals sign by nul, and advance value to 934 * the value string. 935 */ 936 *value = '\0'; 937 value++; 938 child_set_env(env, envsize, cp, value); 939 } 940 fclose(f); 941 } 942 943 void copy_environment(char **source, char ***env, u_int *envsize) 944 { 945 char *var_name, *var_val; 946 int i; 947 948 if (source == NULL) 949 return; 950 951 for(i = 0; source[i] != NULL; i++) { 952 var_name = xstrdup(source[i]); 953 if ((var_val = strstr(var_name, "=")) == NULL) { 954 xfree(var_name); 955 continue; 956 } 957 *var_val++ = '\0'; 958 959 debug3("Copy environment: %s=%s", var_name, var_val); 960 child_set_env(env, envsize, var_name, var_val); 961 962 xfree(var_name); 963 } 964 } 965 966 static char ** 967 do_setup_env(Session *s, const char *shell) 968 { 969 char buf[256]; 970 u_int i, envsize; 971 char **env; 972 #ifdef HAVE_LOGIN_CAP 973 extern char **environ; 974 char **senv, **var; 975 #endif 976 struct passwd *pw = s->pw; 977 978 /* Initialize the environment. */ 979 envsize = 100; 980 env = xmalloc(envsize * sizeof(char *)); 981 env[0] = NULL; 982 983 #ifdef HAVE_CYGWIN 984 /* 985 * The Windows environment contains some setting which are 986 * important for a running system. They must not be dropped. 987 */ 988 copy_environment(environ, &env, &envsize); 989 #endif 990 991 if (getenv("TZ")) 992 child_set_env(&env, &envsize, "TZ", getenv("TZ")); 993 if (!options.use_login) { 994 /* Set basic environment. */ 995 child_set_env(&env, &envsize, "USER", pw->pw_name); 996 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); 997 child_set_env(&env, &envsize, "HOME", pw->pw_dir); 998 snprintf(buf, sizeof buf, "%.200s/%.50s", 999 _PATH_MAILDIR, pw->pw_name); 1000 child_set_env(&env, &envsize, "MAIL", buf); 1001 #ifdef HAVE_LOGIN_CAP 1002 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); 1003 child_set_env(&env, &envsize, "TERM", "su"); 1004 senv = environ; 1005 environ = xmalloc(sizeof(char *)); 1006 *environ = NULL; 1007 (void) setusercontext(lc, pw, pw->pw_uid, 1008 LOGIN_SETENV|LOGIN_SETPATH); 1009 copy_environment(environ, &env, &envsize); 1010 for (var = environ; *var != NULL; ++var) 1011 xfree(*var); 1012 xfree(environ); 1013 environ = senv; 1014 #else /* HAVE_LOGIN_CAP */ 1015 # ifndef HAVE_CYGWIN 1016 /* 1017 * There's no standard path on Windows. The path contains 1018 * important components pointing to the system directories, 1019 * needed for loading shared libraries. So the path better 1020 * remains intact here. 1021 */ 1022 # ifdef SUPERUSER_PATH 1023 child_set_env(&env, &envsize, "PATH", 1024 s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH); 1025 # else 1026 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); 1027 # endif /* SUPERUSER_PATH */ 1028 # endif /* HAVE_CYGWIN */ 1029 #endif /* HAVE_LOGIN_CAP */ 1030 1031 /* Normal systems set SHELL by default. */ 1032 child_set_env(&env, &envsize, "SHELL", shell); 1033 } 1034 1035 /* Set custom environment options from RSA authentication. */ 1036 if (!options.use_login) { 1037 while (custom_environment) { 1038 struct envstring *ce = custom_environment; 1039 char *str = ce->s; 1040 1041 for (i = 0; str[i] != '=' && str[i]; i++) 1042 ; 1043 if (str[i] == '=') { 1044 str[i] = 0; 1045 child_set_env(&env, &envsize, str, str + i + 1); 1046 } 1047 custom_environment = ce->next; 1048 xfree(ce->s); 1049 xfree(ce); 1050 } 1051 } 1052 1053 /* SSH_CLIENT deprecated */ 1054 snprintf(buf, sizeof buf, "%.50s %d %d", 1055 get_remote_ipaddr(), get_remote_port(), get_local_port()); 1056 child_set_env(&env, &envsize, "SSH_CLIENT", buf); 1057 1058 snprintf(buf, sizeof buf, "%.50s %d %.50s %d", 1059 get_remote_ipaddr(), get_remote_port(), 1060 get_local_ipaddr(packet_get_connection_in()), get_local_port()); 1061 child_set_env(&env, &envsize, "SSH_CONNECTION", buf); 1062 1063 if (s->ttyfd != -1) 1064 child_set_env(&env, &envsize, "SSH_TTY", s->tty); 1065 if (s->term) 1066 child_set_env(&env, &envsize, "TERM", s->term); 1067 if (s->display) 1068 child_set_env(&env, &envsize, "DISPLAY", s->display); 1069 if (original_command) 1070 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", 1071 original_command); 1072 1073 #ifdef _UNICOS 1074 if (cray_tmpdir[0] != '\0') 1075 child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); 1076 #endif /* _UNICOS */ 1077 1078 #ifdef _AIX 1079 { 1080 char *cp; 1081 1082 if ((cp = getenv("AUTHSTATE")) != NULL) 1083 child_set_env(&env, &envsize, "AUTHSTATE", cp); 1084 if ((cp = getenv("KRB5CCNAME")) != NULL) 1085 child_set_env(&env, &envsize, "KRB5CCNAME", cp); 1086 read_environment_file(&env, &envsize, "/etc/environment"); 1087 } 1088 #endif 1089 #ifdef KRB4 1090 if (s->authctxt->krb4_ticket_file) 1091 child_set_env(&env, &envsize, "KRBTKFILE", 1092 s->authctxt->krb4_ticket_file); 1093 #endif 1094 #ifdef KRB5 1095 if (s->authctxt->krb5_ticket_file) 1096 child_set_env(&env, &envsize, "KRB5CCNAME", 1097 s->authctxt->krb5_ticket_file); 1098 #endif 1099 #ifdef USE_PAM 1100 /* 1101 * Pull in any environment variables that may have 1102 * been set by PAM. 1103 */ 1104 { 1105 char **p; 1106 1107 p = fetch_pam_environment(); 1108 copy_environment(p, &env, &envsize); 1109 free_pam_environment(p); 1110 } 1111 #endif /* USE_PAM */ 1112 1113 if (auth_sock_name != NULL) 1114 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, 1115 auth_sock_name); 1116 1117 /* read $HOME/.ssh/environment. */ 1118 if (options.permit_user_env && !options.use_login) { 1119 snprintf(buf, sizeof buf, "%.200s/.ssh/environment", 1120 strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); 1121 read_environment_file(&env, &envsize, buf); 1122 } 1123 if (debug_flag) { 1124 /* dump the environment */ 1125 fprintf(stderr, "Environment:\n"); 1126 for (i = 0; env[i]; i++) 1127 fprintf(stderr, " %.200s\n", env[i]); 1128 } 1129 return env; 1130 } 1131 1132 /* 1133 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found 1134 * first in this order). 1135 */ 1136 static void 1137 do_rc_files(Session *s, const char *shell) 1138 { 1139 FILE *f = NULL; 1140 char cmd[1024]; 1141 int do_xauth; 1142 struct stat st; 1143 1144 do_xauth = 1145 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; 1146 1147 /* ignore _PATH_SSH_USER_RC for subsystems */ 1148 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { 1149 snprintf(cmd, sizeof cmd, "%s -c '%s %s'", 1150 shell, _PATH_BSHELL, _PATH_SSH_USER_RC); 1151 if (debug_flag) 1152 fprintf(stderr, "Running %s\n", cmd); 1153 f = popen(cmd, "w"); 1154 if (f) { 1155 if (do_xauth) 1156 fprintf(f, "%s %s\n", s->auth_proto, 1157 s->auth_data); 1158 pclose(f); 1159 } else 1160 fprintf(stderr, "Could not run %s\n", 1161 _PATH_SSH_USER_RC); 1162 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { 1163 if (debug_flag) 1164 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, 1165 _PATH_SSH_SYSTEM_RC); 1166 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); 1167 if (f) { 1168 if (do_xauth) 1169 fprintf(f, "%s %s\n", s->auth_proto, 1170 s->auth_data); 1171 pclose(f); 1172 } else 1173 fprintf(stderr, "Could not run %s\n", 1174 _PATH_SSH_SYSTEM_RC); 1175 } else if (do_xauth && options.xauth_location != NULL) { 1176 /* Add authority data to .Xauthority if appropriate. */ 1177 if (debug_flag) { 1178 fprintf(stderr, 1179 "Running %.500s add " 1180 "%.100s %.100s %.100s\n", 1181 options.xauth_location, s->auth_display, 1182 s->auth_proto, s->auth_data); 1183 } 1184 snprintf(cmd, sizeof cmd, "%s -q -", 1185 options.xauth_location); 1186 f = popen(cmd, "w"); 1187 if (f) { 1188 fprintf(f, "add %s %s %s\n", 1189 s->auth_display, s->auth_proto, 1190 s->auth_data); 1191 pclose(f); 1192 } else { 1193 fprintf(stderr, "Could not run %s\n", 1194 cmd); 1195 } 1196 } 1197 } 1198 1199 static void 1200 do_nologin(struct passwd *pw) 1201 { 1202 FILE *f = NULL; 1203 char buf[1024]; 1204 1205 #ifdef HAVE_LOGIN_CAP 1206 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) 1207 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, 1208 _PATH_NOLOGIN), "r"); 1209 #else 1210 if (pw->pw_uid) 1211 f = fopen(_PATH_NOLOGIN, "r"); 1212 #endif 1213 if (f) { 1214 /* /etc/nologin exists. Print its contents and exit. */ 1215 log("User %.100s not allowed because %s exists", 1216 pw->pw_name, _PATH_NOLOGIN); 1217 while (fgets(buf, sizeof(buf), f)) 1218 fputs(buf, stderr); 1219 fclose(f); 1220 exit(254); 1221 } 1222 } 1223 1224 /* Set login name, uid, gid, and groups. */ 1225 void 1226 do_setusercontext(struct passwd *pw) 1227 { 1228 #ifdef HAVE_CYGWIN 1229 if (is_winnt) { 1230 #else /* HAVE_CYGWIN */ 1231 if (getuid() == 0 || geteuid() == 0) { 1232 #endif /* HAVE_CYGWIN */ 1233 #ifdef HAVE_SETPCRED 1234 setpcred(pw->pw_name); 1235 #endif /* HAVE_SETPCRED */ 1236 #ifdef HAVE_LOGIN_CAP 1237 # ifdef __bsdi__ 1238 setpgid(0, 0); 1239 # endif 1240 if (setusercontext(lc, pw, pw->pw_uid, 1241 (LOGIN_SETALL & ~(LOGIN_SETENV|LOGIN_SETPATH))) < 0) { 1242 perror("unable to set user context"); 1243 exit(1); 1244 } 1245 #else 1246 # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) 1247 /* Sets login uid for accounting */ 1248 if (getluid() == -1 && setluid(pw->pw_uid) == -1) 1249 error("setluid: %s", strerror(errno)); 1250 # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ 1251 1252 if (setlogin(pw->pw_name) < 0) 1253 error("setlogin failed: %s", strerror(errno)); 1254 if (setgid(pw->pw_gid) < 0) { 1255 perror("setgid"); 1256 exit(1); 1257 } 1258 /* Initialize the group list. */ 1259 if (initgroups(pw->pw_name, pw->pw_gid) < 0) { 1260 perror("initgroups"); 1261 exit(1); 1262 } 1263 endgrent(); 1264 # ifdef USE_PAM 1265 /* 1266 * PAM credentials may take the form of supplementary groups. 1267 * These will have been wiped by the above initgroups() call. 1268 * Reestablish them here. 1269 */ 1270 do_pam_setcred(0); 1271 # endif /* USE_PAM */ 1272 # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) 1273 irix_setusercontext(pw); 1274 # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ 1275 # ifdef _AIX 1276 aix_usrinfo(pw); 1277 # endif /* _AIX */ 1278 /* Permanently switch to the desired uid. */ 1279 permanently_set_uid(pw); 1280 #endif 1281 } 1282 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) 1283 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); 1284 } 1285 1286 static void 1287 launch_login(struct passwd *pw, const char *hostname) 1288 { 1289 /* Launch login(1). */ 1290 1291 execl(LOGIN_PROGRAM, "login", "-h", hostname, 1292 #ifdef xxxLOGIN_NEEDS_TERM 1293 (s->term ? s->term : "unknown"), 1294 #endif /* LOGIN_NEEDS_TERM */ 1295 #ifdef LOGIN_NO_ENDOPT 1296 "-p", "-f", pw->pw_name, (char *)NULL); 1297 #else 1298 "-p", "-f", "--", pw->pw_name, (char *)NULL); 1299 #endif 1300 1301 /* Login couldn't be executed, die. */ 1302 1303 perror("login"); 1304 exit(1); 1305 } 1306 1307 /* 1308 * Performs common processing for the child, such as setting up the 1309 * environment, closing extra file descriptors, setting the user and group 1310 * ids, and executing the command or shell. 1311 */ 1312 void 1313 do_child(Session *s, const char *command) 1314 { 1315 extern char **environ; 1316 char **env; 1317 char *argv[10]; 1318 const char *shell, *shell0, *hostname = NULL; 1319 struct passwd *pw = s->pw; 1320 u_int i; 1321 #ifdef HAVE_LOGIN_CAP 1322 int lc_requirehome; 1323 #endif 1324 1325 /* remove hostkey from the child's memory */ 1326 destroy_sensitive_data(); 1327 1328 /* login(1) is only called if we execute the login shell */ 1329 if (options.use_login && command != NULL) 1330 options.use_login = 0; 1331 1332 #ifdef _UNICOS 1333 cray_setup(pw->pw_uid, pw->pw_name, command); 1334 #endif /* _UNICOS */ 1335 1336 /* 1337 * Login(1) does this as well, and it needs uid 0 for the "-h" 1338 * switch, so we let login(1) to this for us. 1339 */ 1340 if (!options.use_login) { 1341 #ifdef HAVE_OSF_SIA 1342 session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty); 1343 if (!check_quietlogin(s, command)) 1344 do_motd(); 1345 #else /* HAVE_OSF_SIA */ 1346 do_nologin(pw); 1347 do_setusercontext(pw); 1348 #endif /* HAVE_OSF_SIA */ 1349 } 1350 1351 /* 1352 * Get the shell from the password data. An empty shell field is 1353 * legal, and means /bin/sh. 1354 */ 1355 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; 1356 #ifdef HAVE_LOGIN_CAP 1357 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); 1358 #endif 1359 1360 env = do_setup_env(s, shell); 1361 1362 /* we have to stash the hostname before we close our socket. */ 1363 if (options.use_login) 1364 hostname = get_remote_name_or_ip(utmp_len, 1365 options.verify_reverse_mapping); 1366 /* 1367 * Close the connection descriptors; note that this is the child, and 1368 * the server will still have the socket open, and it is important 1369 * that we do not shutdown it. Note that the descriptors cannot be 1370 * closed before building the environment, as we call 1371 * get_remote_ipaddr there. 1372 */ 1373 if (packet_get_connection_in() == packet_get_connection_out()) 1374 close(packet_get_connection_in()); 1375 else { 1376 close(packet_get_connection_in()); 1377 close(packet_get_connection_out()); 1378 } 1379 /* 1380 * Close all descriptors related to channels. They will still remain 1381 * open in the parent. 1382 */ 1383 /* XXX better use close-on-exec? -markus */ 1384 channel_close_all(); 1385 1386 #ifdef HAVE_LOGIN_CAP 1387 lc_requirehome = login_getcapbool(lc, "requirehome", 0); 1388 login_close(lc); 1389 #endif 1390 /* 1391 * Close any extra file descriptors. Note that there may still be 1392 * descriptors left by system functions. They will be closed later. 1393 */ 1394 endpwent(); 1395 1396 /* 1397 * Close any extra open file descriptors so that we don\'t have them 1398 * hanging around in clients. Note that we want to do this after 1399 * initgroups, because at least on Solaris 2.3 it leaves file 1400 * descriptors open. 1401 */ 1402 for (i = 3; i < 64; i++) 1403 close(i); 1404 1405 /* 1406 * Must take new environment into use so that .ssh/rc, 1407 * /etc/ssh/sshrc and xauth are run in the proper environment. 1408 */ 1409 environ = env; 1410 1411 #ifdef AFS 1412 /* Try to get AFS tokens for the local cell. */ 1413 if (k_hasafs()) { 1414 char cell[64]; 1415 1416 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) 1417 krb_afslog(cell, 0); 1418 1419 krb_afslog(0, 0); 1420 } 1421 #endif /* AFS */ 1422 1423 /* Change current directory to the user\'s home directory. */ 1424 if (chdir(pw->pw_dir) < 0) { 1425 fprintf(stderr, "Could not chdir to home directory %s: %s\n", 1426 pw->pw_dir, strerror(errno)); 1427 #ifdef HAVE_LOGIN_CAP 1428 if (lc_requirehome) 1429 exit(1); 1430 #endif 1431 } 1432 1433 if (!options.use_login) 1434 do_rc_files(s, shell); 1435 1436 /* restore SIGPIPE for child */ 1437 signal(SIGPIPE, SIG_DFL); 1438 1439 if (options.use_login) { 1440 launch_login(pw, hostname); 1441 /* NEVERREACHED */ 1442 } 1443 1444 /* Get the last component of the shell name. */ 1445 if ((shell0 = strrchr(shell, '/')) != NULL) 1446 shell0++; 1447 else 1448 shell0 = shell; 1449 1450 /* 1451 * If we have no command, execute the shell. In this case, the shell 1452 * name to be passed in argv[0] is preceded by '-' to indicate that 1453 * this is a login shell. 1454 */ 1455 if (!command) { 1456 char argv0[256]; 1457 1458 /* Start the shell. Set initial character to '-'. */ 1459 argv0[0] = '-'; 1460 1461 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) 1462 >= sizeof(argv0) - 1) { 1463 errno = EINVAL; 1464 perror(shell); 1465 exit(1); 1466 } 1467 1468 /* Execute the shell. */ 1469 argv[0] = argv0; 1470 argv[1] = NULL; 1471 execve(shell, argv, env); 1472 1473 /* Executing the shell failed. */ 1474 perror(shell); 1475 exit(1); 1476 } 1477 /* 1478 * Execute the command using the user's shell. This uses the -c 1479 * option to execute the command. 1480 */ 1481 argv[0] = (char *) shell0; 1482 argv[1] = "-c"; 1483 argv[2] = (char *) command; 1484 argv[3] = NULL; 1485 execve(shell, argv, env); 1486 perror(shell); 1487 exit(1); 1488 } 1489 1490 Session * 1491 session_new(void) 1492 { 1493 int i; 1494 static int did_init = 0; 1495 if (!did_init) { 1496 debug("session_new: init"); 1497 for (i = 0; i < MAX_SESSIONS; i++) { 1498 sessions[i].used = 0; 1499 } 1500 did_init = 1; 1501 } 1502 for (i = 0; i < MAX_SESSIONS; i++) { 1503 Session *s = &sessions[i]; 1504 if (! s->used) { 1505 memset(s, 0, sizeof(*s)); 1506 s->chanid = -1; 1507 s->ptyfd = -1; 1508 s->ttyfd = -1; 1509 s->used = 1; 1510 s->self = i; 1511 debug("session_new: session %d", i); 1512 return s; 1513 } 1514 } 1515 return NULL; 1516 } 1517 1518 static void 1519 session_dump(void) 1520 { 1521 int i; 1522 for (i = 0; i < MAX_SESSIONS; i++) { 1523 Session *s = &sessions[i]; 1524 debug("dump: used %d session %d %p channel %d pid %ld", 1525 s->used, 1526 s->self, 1527 s, 1528 s->chanid, 1529 (long)s->pid); 1530 } 1531 } 1532 1533 int 1534 session_open(Authctxt *authctxt, int chanid) 1535 { 1536 Session *s = session_new(); 1537 debug("session_open: channel %d", chanid); 1538 if (s == NULL) { 1539 error("no more sessions"); 1540 return 0; 1541 } 1542 s->authctxt = authctxt; 1543 s->pw = authctxt->pw; 1544 if (s->pw == NULL) 1545 fatal("no user for session %d", s->self); 1546 debug("session_open: session %d: link with channel %d", s->self, chanid); 1547 s->chanid = chanid; 1548 return 1; 1549 } 1550 1551 Session * 1552 session_by_tty(char *tty) 1553 { 1554 int i; 1555 for (i = 0; i < MAX_SESSIONS; i++) { 1556 Session *s = &sessions[i]; 1557 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { 1558 debug("session_by_tty: session %d tty %s", i, tty); 1559 return s; 1560 } 1561 } 1562 debug("session_by_tty: unknown tty %.100s", tty); 1563 session_dump(); 1564 return NULL; 1565 } 1566 1567 static Session * 1568 session_by_channel(int id) 1569 { 1570 int i; 1571 for (i = 0; i < MAX_SESSIONS; i++) { 1572 Session *s = &sessions[i]; 1573 if (s->used && s->chanid == id) { 1574 debug("session_by_channel: session %d channel %d", i, id); 1575 return s; 1576 } 1577 } 1578 debug("session_by_channel: unknown channel %d", id); 1579 session_dump(); 1580 return NULL; 1581 } 1582 1583 static Session * 1584 session_by_pid(pid_t pid) 1585 { 1586 int i; 1587 debug("session_by_pid: pid %ld", (long)pid); 1588 for (i = 0; i < MAX_SESSIONS; i++) { 1589 Session *s = &sessions[i]; 1590 if (s->used && s->pid == pid) 1591 return s; 1592 } 1593 error("session_by_pid: unknown pid %ld", (long)pid); 1594 session_dump(); 1595 return NULL; 1596 } 1597 1598 static int 1599 session_window_change_req(Session *s) 1600 { 1601 s->col = packet_get_int(); 1602 s->row = packet_get_int(); 1603 s->xpixel = packet_get_int(); 1604 s->ypixel = packet_get_int(); 1605 packet_check_eom(); 1606 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); 1607 return 1; 1608 } 1609 1610 static int 1611 session_pty_req(Session *s) 1612 { 1613 u_int len; 1614 int n_bytes; 1615 1616 if (no_pty_flag) { 1617 debug("Allocating a pty not permitted for this authentication."); 1618 return 0; 1619 } 1620 if (s->ttyfd != -1) { 1621 packet_disconnect("Protocol error: you already have a pty."); 1622 return 0; 1623 } 1624 /* Get the time and hostname when the user last logged in. */ 1625 if (options.print_lastlog) { 1626 s->hostname[0] = '\0'; 1627 s->last_login_time = get_last_login_time(s->pw->pw_uid, 1628 s->pw->pw_name, s->hostname, sizeof(s->hostname)); 1629 } 1630 1631 s->term = packet_get_string(&len); 1632 1633 if (compat20) { 1634 s->col = packet_get_int(); 1635 s->row = packet_get_int(); 1636 } else { 1637 s->row = packet_get_int(); 1638 s->col = packet_get_int(); 1639 } 1640 s->xpixel = packet_get_int(); 1641 s->ypixel = packet_get_int(); 1642 1643 if (strcmp(s->term, "") == 0) { 1644 xfree(s->term); 1645 s->term = NULL; 1646 } 1647 1648 /* Allocate a pty and open it. */ 1649 debug("Allocating pty."); 1650 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { 1651 if (s->term) 1652 xfree(s->term); 1653 s->term = NULL; 1654 s->ptyfd = -1; 1655 s->ttyfd = -1; 1656 error("session_pty_req: session %d alloc failed", s->self); 1657 return 0; 1658 } 1659 debug("session_pty_req: session %d alloc %s", s->self, s->tty); 1660 1661 /* for SSH1 the tty modes length is not given */ 1662 if (!compat20) 1663 n_bytes = packet_remaining(); 1664 tty_parse_modes(s->ttyfd, &n_bytes); 1665 1666 /* 1667 * Add a cleanup function to clear the utmp entry and record logout 1668 * time in case we call fatal() (e.g., the connection gets closed). 1669 */ 1670 fatal_add_cleanup(session_pty_cleanup, (void *)s); 1671 if (!use_privsep) 1672 pty_setowner(s->pw, s->tty); 1673 1674 /* Set window size from the packet. */ 1675 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); 1676 1677 packet_check_eom(); 1678 session_proctitle(s); 1679 return 1; 1680 } 1681 1682 static int 1683 session_subsystem_req(Session *s) 1684 { 1685 struct stat st; 1686 u_int len; 1687 int success = 0; 1688 char *cmd, *subsys = packet_get_string(&len); 1689 int i; 1690 1691 packet_check_eom(); 1692 log("subsystem request for %.100s", subsys); 1693 1694 for (i = 0; i < options.num_subsystems; i++) { 1695 if (strcmp(subsys, options.subsystem_name[i]) == 0) { 1696 cmd = options.subsystem_command[i]; 1697 if (stat(cmd, &st) < 0) { 1698 error("subsystem: cannot stat %s: %s", cmd, 1699 strerror(errno)); 1700 break; 1701 } 1702 debug("subsystem: exec() %s", cmd); 1703 s->is_subsystem = 1; 1704 do_exec(s, cmd); 1705 success = 1; 1706 break; 1707 } 1708 } 1709 1710 if (!success) 1711 log("subsystem request for %.100s failed, subsystem not found", 1712 subsys); 1713 1714 xfree(subsys); 1715 return success; 1716 } 1717 1718 static int 1719 session_x11_req(Session *s) 1720 { 1721 int success; 1722 1723 s->single_connection = packet_get_char(); 1724 s->auth_proto = packet_get_string(NULL); 1725 s->auth_data = packet_get_string(NULL); 1726 s->screen = packet_get_int(); 1727 packet_check_eom(); 1728 1729 success = session_setup_x11fwd(s); 1730 if (!success) { 1731 xfree(s->auth_proto); 1732 xfree(s->auth_data); 1733 s->auth_proto = NULL; 1734 s->auth_data = NULL; 1735 } 1736 return success; 1737 } 1738 1739 static int 1740 session_shell_req(Session *s) 1741 { 1742 packet_check_eom(); 1743 do_exec(s, NULL); 1744 return 1; 1745 } 1746 1747 static int 1748 session_exec_req(Session *s) 1749 { 1750 u_int len; 1751 char *command = packet_get_string(&len); 1752 packet_check_eom(); 1753 do_exec(s, command); 1754 xfree(command); 1755 return 1; 1756 } 1757 1758 static int 1759 session_auth_agent_req(Session *s) 1760 { 1761 static int called = 0; 1762 packet_check_eom(); 1763 if (no_agent_forwarding_flag) { 1764 debug("session_auth_agent_req: no_agent_forwarding_flag"); 1765 return 0; 1766 } 1767 if (called) { 1768 return 0; 1769 } else { 1770 called = 1; 1771 return auth_input_request_forwarding(s->pw); 1772 } 1773 } 1774 1775 int 1776 session_input_channel_req(Channel *c, const char *rtype) 1777 { 1778 int success = 0; 1779 Session *s; 1780 1781 if ((s = session_by_channel(c->self)) == NULL) { 1782 log("session_input_channel_req: no session %d req %.100s", 1783 c->self, rtype); 1784 return 0; 1785 } 1786 debug("session_input_channel_req: session %d req %s", s->self, rtype); 1787 1788 /* 1789 * a session is in LARVAL state until a shell, a command 1790 * or a subsystem is executed 1791 */ 1792 if (c->type == SSH_CHANNEL_LARVAL) { 1793 if (strcmp(rtype, "shell") == 0) { 1794 success = session_shell_req(s); 1795 } else if (strcmp(rtype, "exec") == 0) { 1796 success = session_exec_req(s); 1797 } else if (strcmp(rtype, "pty-req") == 0) { 1798 success = session_pty_req(s); 1799 } else if (strcmp(rtype, "x11-req") == 0) { 1800 success = session_x11_req(s); 1801 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { 1802 success = session_auth_agent_req(s); 1803 } else if (strcmp(rtype, "subsystem") == 0) { 1804 success = session_subsystem_req(s); 1805 } 1806 } 1807 if (strcmp(rtype, "window-change") == 0) { 1808 success = session_window_change_req(s); 1809 } 1810 return success; 1811 } 1812 1813 void 1814 session_set_fds(Session *s, int fdin, int fdout, int fderr) 1815 { 1816 if (!compat20) 1817 fatal("session_set_fds: called for proto != 2.0"); 1818 /* 1819 * now that have a child and a pipe to the child, 1820 * we can activate our channel and register the fd's 1821 */ 1822 if (s->chanid == -1) 1823 fatal("no channel for session %d", s->self); 1824 channel_set_fds(s->chanid, 1825 fdout, fdin, fderr, 1826 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, 1827 1, 1828 CHAN_SES_WINDOW_DEFAULT); 1829 } 1830 1831 /* 1832 * Function to perform pty cleanup. Also called if we get aborted abnormally 1833 * (e.g., due to a dropped connection). 1834 */ 1835 void 1836 session_pty_cleanup2(void *session) 1837 { 1838 Session *s = session; 1839 1840 if (s == NULL) { 1841 error("session_pty_cleanup: no session"); 1842 return; 1843 } 1844 if (s->ttyfd == -1) 1845 return; 1846 1847 debug("session_pty_cleanup: session %d release %s", s->self, s->tty); 1848 1849 /* Record that the user has logged out. */ 1850 if (s->pid != 0) 1851 record_logout(s->pid, s->tty, s->pw->pw_name); 1852 1853 /* Release the pseudo-tty. */ 1854 if (getuid() == 0) 1855 pty_release(s->tty); 1856 1857 /* 1858 * Close the server side of the socket pairs. We must do this after 1859 * the pty cleanup, so that another process doesn't get this pty 1860 * while we're still cleaning up. 1861 */ 1862 if (close(s->ptymaster) < 0) 1863 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); 1864 1865 /* unlink pty from session */ 1866 s->ttyfd = -1; 1867 } 1868 1869 void 1870 session_pty_cleanup(void *session) 1871 { 1872 PRIVSEP(session_pty_cleanup2(session)); 1873 } 1874 1875 static char * 1876 sig2name(int sig) 1877 { 1878 #define SSH_SIG(x) if (sig == SIG ## x) return #x 1879 SSH_SIG(ABRT); 1880 SSH_SIG(ALRM); 1881 SSH_SIG(FPE); 1882 SSH_SIG(HUP); 1883 SSH_SIG(ILL); 1884 SSH_SIG(INT); 1885 SSH_SIG(KILL); 1886 SSH_SIG(PIPE); 1887 SSH_SIG(QUIT); 1888 SSH_SIG(SEGV); 1889 SSH_SIG(TERM); 1890 SSH_SIG(USR1); 1891 SSH_SIG(USR2); 1892 #undef SSH_SIG 1893 return "SIG@openssh.com"; 1894 } 1895 1896 static void 1897 session_exit_message(Session *s, int status) 1898 { 1899 Channel *c; 1900 1901 if ((c = channel_lookup(s->chanid)) == NULL) 1902 fatal("session_exit_message: session %d: no channel %d", 1903 s->self, s->chanid); 1904 debug("session_exit_message: session %d channel %d pid %ld", 1905 s->self, s->chanid, (long)s->pid); 1906 1907 if (WIFEXITED(status)) { 1908 channel_request_start(s->chanid, "exit-status", 0); 1909 packet_put_int(WEXITSTATUS(status)); 1910 packet_send(); 1911 } else if (WIFSIGNALED(status)) { 1912 channel_request_start(s->chanid, "exit-signal", 0); 1913 packet_put_cstring(sig2name(WTERMSIG(status))); 1914 #ifdef WCOREDUMP 1915 packet_put_char(WCOREDUMP(status)); 1916 #else /* WCOREDUMP */ 1917 packet_put_char(0); 1918 #endif /* WCOREDUMP */ 1919 packet_put_cstring(""); 1920 packet_put_cstring(""); 1921 packet_send(); 1922 } else { 1923 /* Some weird exit cause. Just exit. */ 1924 packet_disconnect("wait returned status %04x.", status); 1925 } 1926 1927 /* disconnect channel */ 1928 debug("session_exit_message: release channel %d", s->chanid); 1929 channel_cancel_cleanup(s->chanid); 1930 /* 1931 * emulate a write failure with 'chan_write_failed', nobody will be 1932 * interested in data we write. 1933 * Note that we must not call 'chan_read_failed', since there could 1934 * be some more data waiting in the pipe. 1935 */ 1936 if (c->ostate != CHAN_OUTPUT_CLOSED) 1937 chan_write_failed(c); 1938 s->chanid = -1; 1939 } 1940 1941 void 1942 session_close(Session *s) 1943 { 1944 debug("session_close: session %d pid %ld", s->self, (long)s->pid); 1945 if (s->ttyfd != -1) { 1946 fatal_remove_cleanup(session_pty_cleanup, (void *)s); 1947 session_pty_cleanup(s); 1948 } 1949 if (s->term) 1950 xfree(s->term); 1951 if (s->display) 1952 xfree(s->display); 1953 if (s->auth_display) 1954 xfree(s->auth_display); 1955 if (s->auth_data) 1956 xfree(s->auth_data); 1957 if (s->auth_proto) 1958 xfree(s->auth_proto); 1959 s->used = 0; 1960 session_proctitle(s); 1961 } 1962 1963 void 1964 session_close_by_pid(pid_t pid, int status) 1965 { 1966 Session *s = session_by_pid(pid); 1967 if (s == NULL) { 1968 debug("session_close_by_pid: no session for pid %ld", 1969 (long)pid); 1970 return; 1971 } 1972 if (s->chanid != -1) 1973 session_exit_message(s, status); 1974 session_close(s); 1975 } 1976 1977 /* 1978 * this is called when a channel dies before 1979 * the session 'child' itself dies 1980 */ 1981 void 1982 session_close_by_channel(int id, void *arg) 1983 { 1984 Session *s = session_by_channel(id); 1985 if (s == NULL) { 1986 debug("session_close_by_channel: no session for id %d", id); 1987 return; 1988 } 1989 debug("session_close_by_channel: channel %d child %ld", 1990 id, (long)s->pid); 1991 if (s->pid != 0) { 1992 debug("session_close_by_channel: channel %d: has child", id); 1993 /* 1994 * delay detach of session, but release pty, since 1995 * the fd's to the child are already closed 1996 */ 1997 if (s->ttyfd != -1) { 1998 fatal_remove_cleanup(session_pty_cleanup, (void *)s); 1999 session_pty_cleanup(s); 2000 } 2001 return; 2002 } 2003 /* detach by removing callback */ 2004 channel_cancel_cleanup(s->chanid); 2005 s->chanid = -1; 2006 session_close(s); 2007 } 2008 2009 void 2010 session_destroy_all(void (*closefunc)(Session *)) 2011 { 2012 int i; 2013 for (i = 0; i < MAX_SESSIONS; i++) { 2014 Session *s = &sessions[i]; 2015 if (s->used) { 2016 if (closefunc != NULL) 2017 closefunc(s); 2018 else 2019 session_close(s); 2020 } 2021 } 2022 } 2023 2024 static char * 2025 session_tty_list(void) 2026 { 2027 static char buf[1024]; 2028 int i; 2029 buf[0] = '\0'; 2030 for (i = 0; i < MAX_SESSIONS; i++) { 2031 Session *s = &sessions[i]; 2032 if (s->used && s->ttyfd != -1) { 2033 if (buf[0] != '\0') 2034 strlcat(buf, ",", sizeof buf); 2035 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); 2036 } 2037 } 2038 if (buf[0] == '\0') 2039 strlcpy(buf, "notty", sizeof buf); 2040 return buf; 2041 } 2042 2043 void 2044 session_proctitle(Session *s) 2045 { 2046 if (s->pw == NULL) 2047 error("no user for session %d", s->self); 2048 else 2049 setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); 2050 } 2051 2052 int 2053 session_setup_x11fwd(Session *s) 2054 { 2055 struct stat st; 2056 char display[512], auth_display[512]; 2057 char hostname[MAXHOSTNAMELEN]; 2058 2059 if (no_x11_forwarding_flag) { 2060 packet_send_debug("X11 forwarding disabled in user configuration file."); 2061 return 0; 2062 } 2063 if (!options.x11_forwarding) { 2064 debug("X11 forwarding disabled in server configuration file."); 2065 return 0; 2066 } 2067 if (!options.xauth_location || 2068 (stat(options.xauth_location, &st) == -1)) { 2069 packet_send_debug("No xauth program; cannot forward with spoofing."); 2070 return 0; 2071 } 2072 if (options.use_login) { 2073 packet_send_debug("X11 forwarding disabled; " 2074 "not compatible with UseLogin=yes."); 2075 return 0; 2076 } 2077 if (s->display != NULL) { 2078 debug("X11 display already set."); 2079 return 0; 2080 } 2081 if (x11_create_display_inet(options.x11_display_offset, 2082 options.x11_use_localhost, s->single_connection, 2083 &s->display_number) == -1) { 2084 debug("x11_create_display_inet failed."); 2085 return 0; 2086 } 2087 2088 /* Set up a suitable value for the DISPLAY variable. */ 2089 if (gethostname(hostname, sizeof(hostname)) < 0) 2090 fatal("gethostname: %.100s", strerror(errno)); 2091 /* 2092 * auth_display must be used as the displayname when the 2093 * authorization entry is added with xauth(1). This will be 2094 * different than the DISPLAY string for localhost displays. 2095 */ 2096 if (options.x11_use_localhost) { 2097 snprintf(display, sizeof display, "localhost:%u.%u", 2098 s->display_number, s->screen); 2099 snprintf(auth_display, sizeof auth_display, "unix:%u.%u", 2100 s->display_number, s->screen); 2101 s->display = xstrdup(display); 2102 s->auth_display = xstrdup(auth_display); 2103 } else { 2104 #ifdef IPADDR_IN_DISPLAY 2105 struct hostent *he; 2106 struct in_addr my_addr; 2107 2108 he = gethostbyname(hostname); 2109 if (he == NULL) { 2110 error("Can't get IP address for X11 DISPLAY."); 2111 packet_send_debug("Can't get IP address for X11 DISPLAY."); 2112 return 0; 2113 } 2114 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); 2115 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), 2116 s->display_number, s->screen); 2117 #else 2118 snprintf(display, sizeof display, "%.400s:%u.%u", hostname, 2119 s->display_number, s->screen); 2120 #endif 2121 s->display = xstrdup(display); 2122 s->auth_display = xstrdup(display); 2123 } 2124 2125 return 1; 2126 } 2127 2128 static void 2129 do_authenticated2(Authctxt *authctxt) 2130 { 2131 server_loop2(authctxt); 2132 } 2133