ftpd.c revision 1.182
1/* $OpenBSD: ftpd.c,v 1.182 2008/04/13 00:22:16 djm Exp $ */ 2/* $NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $ */ 3 4/* 5 * Copyright (C) 1997 and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* 34 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 */ 61 62#ifndef lint 63static const char copyright[] = 64"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 65 The Regents of the University of California. All rights reserved.\n"; 66#endif /* not lint */ 67 68#ifndef lint 69#if 0 70static const char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 71#else 72static const char rcsid[] = 73 "$OpenBSD: ftpd.c,v 1.182 2008/04/13 00:22:16 djm Exp $"; 74#endif 75#endif /* not lint */ 76 77/* 78 * FTP server. 79 */ 80#include <sys/param.h> 81#include <sys/stat.h> 82#include <sys/ioctl.h> 83#include <sys/socket.h> 84#include <sys/wait.h> 85#include <sys/mman.h> 86 87#include <netinet/in.h> 88#include <netinet/in_systm.h> 89#include <netinet/ip.h> 90#include <netinet/tcp.h> 91 92#define FTP_NAMES 93#include <arpa/ftp.h> 94#include <arpa/inet.h> 95#include <arpa/telnet.h> 96 97#include <bsd_auth.h> 98#include <ctype.h> 99#include <dirent.h> 100#include <errno.h> 101#include <fcntl.h> 102#include <glob.h> 103#include <limits.h> 104#include <login_cap.h> 105#include <netdb.h> 106#include <pwd.h> 107#include <signal.h> 108#include <stdarg.h> 109#include <stdio.h> 110#include <stdlib.h> 111#include <string.h> 112#include <syslog.h> 113#include <time.h> 114#include <vis.h> 115#include <unistd.h> 116#include <util.h> 117#include <utmp.h> 118#include <poll.h> 119 120#if defined(TCPWRAPPERS) 121#include <tcpd.h> 122#endif /* TCPWRAPPERS */ 123 124#include "pathnames.h" 125#include "extern.h" 126#include "monitor.h" 127 128extern off_t restart_point; 129extern char cbuf[]; 130 131union sockunion ctrl_addr; 132union sockunion data_source; 133union sockunion data_dest; 134union sockunion his_addr; 135union sockunion pasv_addr; 136 137sigset_t allsigs; 138 139int daemon_mode = 0; 140int data; 141int logged_in; 142struct passwd *pw; 143int debug = 0; 144int timeout = 900; /* timeout after 15 minutes of inactivity */ 145int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 146int logging; 147int anon_ok = 1; 148int anon_only = 0; 149int multihome = 0; 150int guest; 151int stats; 152int statfd = -1; 153int portcheck = 1; 154int dochroot; 155int type; 156int form; 157int stru; /* avoid C keyword */ 158int mode; 159int doutmp = 0; /* update utmp file */ 160int usedefault = 1; /* for data transfers */ 161int pdata = -1; /* for passive mode */ 162int family = AF_UNSPEC; 163volatile sig_atomic_t transflag; 164off_t file_size; 165off_t byte_count; 166#if !defined(CMASK) || CMASK == 0 167#undef CMASK 168#define CMASK 022 169#endif 170mode_t defumask = CMASK; /* default umask value */ 171int umaskchange = 1; /* allow user to change umask value. */ 172char tmpline[7]; 173char hostname[MAXHOSTNAMELEN]; 174char remotehost[MAXHOSTNAMELEN]; 175char dhostname[MAXHOSTNAMELEN]; 176char *guestpw; 177char ttyline[20]; 178#if 0 179char *tty = ttyline; /* for klogin */ 180#endif 181static struct utmp utmp; /* for utmp */ 182static login_cap_t *lc; 183static auth_session_t *as; 184static volatile sig_atomic_t recvurg; 185 186#if defined(TCPWRAPPERS) 187int allow_severity = LOG_INFO; 188int deny_severity = LOG_NOTICE; 189#endif /* TCPWRAPPERS */ 190 191char *ident = NULL; 192 193 194int epsvall = 0; 195 196/* 197 * Timeout intervals for retrying connections 198 * to hosts that don't accept PORT cmds. This 199 * is a kludge, but given the problems with TCP... 200 */ 201#define SWAITMAX 90 /* wait at most 90 seconds */ 202#define SWAITINT 5 /* interval between retries */ 203 204int swaitmax = SWAITMAX; 205int swaitint = SWAITINT; 206 207#ifdef HASSETPROCTITLE 208char proctitle[BUFSIZ]; /* initial part of title */ 209#endif /* HASSETPROCTITLE */ 210 211#define LOGCMD(cmd, file) \ 212 if (logging > 1) \ 213 syslog(LOG_INFO,"%s %s%s", cmd, \ 214 *(file) == '/' ? "" : curdir(), file); 215#define LOGCMD2(cmd, file1, file2) \ 216 if (logging > 1) \ 217 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 218 *(file1) == '/' ? "" : curdir(), file1, \ 219 *(file2) == '/' ? "" : curdir(), file2); 220#define LOGBYTES(cmd, file, cnt) \ 221 if (logging > 1) { \ 222 if (cnt == (off_t)-1) \ 223 syslog(LOG_INFO,"%s %s%s", cmd, \ 224 *(file) == '/' ? "" : curdir(), file); \ 225 else \ 226 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 227 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 228 } 229 230static void ack(char *); 231static void sigurg(int); 232static void myoob(void); 233static int checkuser(char *, char *); 234static FILE *dataconn(char *, off_t, char *); 235static void dolog(struct sockaddr *); 236static char *copy_dir(char *, struct passwd *); 237static char *curdir(void); 238static void end_login(void); 239static FILE *getdatasock(char *); 240static int guniquefd(char *, char **); 241static void lostconn(int); 242static void sigquit(int); 243static int receive_data(FILE *, FILE *); 244static void replydirname(const char *, const char *); 245static int send_data(FILE *, FILE *, off_t, off_t, int); 246static struct passwd * 247 sgetpwnam(char *, struct passwd *); 248static void reapchild(int); 249#if defined(TCPWRAPPERS) 250static int check_host(struct sockaddr *); 251#endif /* TCPWRAPPERS */ 252static void usage(void); 253 254void logxfer(char *, off_t, time_t); 255void set_slave_signals(void); 256 257static char * 258curdir(void) 259{ 260 static char path[MAXPATHLEN+1]; /* path + '/' */ 261 262 if (getcwd(path, sizeof(path)-1) == NULL) 263 return (""); 264 if (path[1] != '\0') /* special case for root dir. */ 265 strlcat(path, "/", sizeof path); 266 /* For guest account, skip / since it's chrooted */ 267 return (guest ? path+1 : path); 268} 269 270char *argstr = "AdDhnlMSt:T:u:UvP46"; 271 272static void 273usage(void) 274{ 275 syslog(LOG_ERR, 276 "usage: ftpd [-46ADdlMnPSU] [-T maxtimeout] [-t timeout] [-u mask]"); 277 exit(2); 278} 279 280int 281main(int argc, char *argv[]) 282{ 283 socklen_t addrlen; 284 int ch, on = 1, tos; 285 char line[LINE_MAX]; 286 FILE *fp; 287 struct hostent *hp; 288 struct sigaction sa; 289 int error = 0; 290 const char *errstr; 291 292 tzset(); /* in case no timezone database in ~ftp */ 293 sigfillset(&allsigs); /* used to block signals while root */ 294 sigemptyset(&sa.sa_mask); 295 sa.sa_flags = SA_RESTART; 296 297 while ((ch = getopt(argc, argv, argstr)) != -1) { 298 switch (ch) { 299 case 'A': 300 anon_only = 1; 301 break; 302 303 case 'd': 304 case 'v': /* deprecated */ 305 debug = 1; 306 break; 307 308 case 'D': 309 daemon_mode = 1; 310 break; 311 312 case 'P': 313 portcheck = 0; 314 break; 315 316 case 'h': /* deprecated */ 317 break; 318 319 case 'l': 320 logging++; /* > 1 == extra logging */ 321 break; 322 323 case 'M': 324 multihome = 1; 325 break; 326 327 case 'n': 328 anon_ok = 0; 329 break; 330 331 case 'S': 332 stats = 1; 333 break; 334 335 case 't': 336 timeout = strtonum(optarg, 0, INT_MAX, &errstr); 337 if (errstr) { 338 syslog(LOG_ERR, 339 "%s is a bad value for -t, aborting", 340 optarg); 341 exit(2); 342 } 343 if (maxtimeout < timeout) 344 maxtimeout = timeout; 345 break; 346 347 case 'T': 348 maxtimeout = strtonum(optarg, 0, INT_MAX, 349 &errstr); 350 if (errstr) { 351 syslog(LOG_ERR, 352 "%s is a bad value for -T, aborting", 353 optarg); 354 exit(2); 355 } 356 if (timeout > maxtimeout) 357 timeout = maxtimeout; 358 break; 359 360 case 'u': 361 { 362 long val = 0; 363 char *p; 364 umaskchange = 0; 365 366 val = strtol(optarg, &p, 8); 367 if (*optarg == '\0' || *p != '\0' || val < 0 || 368 (val & ~ACCESSPERMS)) { 369 syslog(LOG_ERR, 370 "%s is a bad value for -u, aborting", 371 optarg); 372 exit(2); 373 } 374 defumask = val; 375 break; 376 } 377 378 case 'U': 379 doutmp = 1; 380 break; 381 382 case '4': 383 family = AF_INET; 384 break; 385 386 case '6': 387 family = AF_INET6; 388 break; 389 390 default: 391 usage(); 392 break; 393 } 394 } 395 396 (void) freopen(_PATH_DEVNULL, "w", stderr); 397 398 /* 399 * LOG_NDELAY sets up the logging connection immediately, 400 * necessary for anonymous ftp's that chroot and can't do it later. 401 */ 402 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 403 404 if (getpwnam(FTPD_PRIVSEP_USER) == NULL) { 405 syslog(LOG_ERR, "privilege separation user %s not found", 406 FTPD_PRIVSEP_USER); 407 exit(1); 408 } 409 endpwent(); 410 411 if (daemon_mode) { 412 int *fds, i, fd; 413 struct pollfd *pfds; 414 struct addrinfo hints, *res, *res0; 415 nfds_t n; 416 417 /* 418 * Detach from parent. 419 */ 420 if (daemon(1, 1) < 0) { 421 syslog(LOG_ERR, "failed to become a daemon"); 422 exit(1); 423 } 424 sa.sa_handler = reapchild; 425 (void) sigaction(SIGCHLD, &sa, NULL); 426 427 memset(&hints, 0, sizeof(hints)); 428 hints.ai_family = family; 429 hints.ai_socktype = SOCK_STREAM; 430 hints.ai_protocol = IPPROTO_TCP; 431 hints.ai_flags = AI_PASSIVE; 432 error = getaddrinfo(NULL, "ftp", &hints, &res0); 433 if (error) { 434 syslog(LOG_ERR, "%s", gai_strerror(error)); 435 exit(1); 436 } 437 438 n = 0; 439 for (res = res0; res; res = res->ai_next) 440 n++; 441 442 fds = calloc(n, sizeof(int)); 443 pfds = calloc(n, sizeof(struct pollfd)); 444 if (!fds || !pfds) { 445 syslog(LOG_ERR, "%s", strerror(errno)); 446 exit(1); 447 } 448 449 /* 450 * Open sockets, bind it to the FTP port, and start 451 * listening. 452 */ 453 n = 0; 454 for (res = res0; res; res = res->ai_next) { 455 fds[n] = socket(res->ai_family, res->ai_socktype, 456 res->ai_protocol); 457 if (fds[n] < 0) 458 continue; 459 460 if (setsockopt(fds[n], SOL_SOCKET, SO_REUSEADDR, 461 &on, sizeof(on)) < 0) { 462 close(fds[n]); 463 fds[n] = -1; 464 continue; 465 } 466 467 if (bind(fds[n], res->ai_addr, res->ai_addrlen) < 0) { 468 close(fds[n]); 469 fds[n] = -1; 470 continue; 471 } 472 if (listen(fds[n], 32) < 0) { 473 close(fds[n]); 474 fds[n] = -1; 475 continue; 476 } 477 478 pfds[n].fd = fds[n]; 479 pfds[n].events = POLLIN; 480 n++; 481 } 482 freeaddrinfo(res0); 483 484 if (n == 0) { 485 syslog(LOG_ERR, "could not open control socket"); 486 exit(1); 487 } 488 489 /* Stash pid in pidfile */ 490 if (pidfile(NULL)) 491 syslog(LOG_ERR, "can't open pidfile: %m"); 492 /* 493 * Loop forever accepting connection requests and forking off 494 * children to handle them. 495 */ 496 while (1) { 497 if (poll(pfds, n, INFTIM) < 0) { 498 if (errno == EINTR) 499 continue; 500 syslog(LOG_ERR, "poll: %m"); 501 exit(1); 502 } 503 for (i = 0; i < n; i++) 504 if (pfds[i].revents & POLLIN) { 505 addrlen = sizeof(his_addr); 506 fd = accept(pfds[i].fd, 507 (struct sockaddr *)&his_addr, 508 &addrlen); 509 if (fd != -1) { 510 if (fork() == 0) 511 goto child; 512 close(fd); 513 } 514 } 515 } 516 517 child: 518 /* child */ 519 (void)dup2(fd, STDIN_FILENO); 520 (void)dup2(fd, STDOUT_FILENO); 521 for (i = 0; i < n; i++) 522 close(fds[i]); 523#if defined(TCPWRAPPERS) 524 /* ..in the child. */ 525 if (!check_host((struct sockaddr *)&his_addr)) 526 exit(1); 527#endif /* TCPWRAPPERS */ 528 } else { 529 addrlen = sizeof(his_addr); 530 if (getpeername(0, (struct sockaddr *)&his_addr, 531 &addrlen) < 0) { 532 /* syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); */ 533 exit(1); 534 } 535 } 536 537 /* set this here so klogin can use it... */ 538 (void)snprintf(ttyline, sizeof(ttyline), "ftp%ld", (long)getpid()); 539 540 set_slave_signals(); 541 542 addrlen = sizeof(ctrl_addr); 543 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 544 syslog(LOG_ERR, "getsockname: %m"); 545 exit(1); 546 } 547 if (his_addr.su_family == AF_INET6 && 548 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 549#if 1 550 /* 551 * IPv4 control connection arrived to AF_INET6 socket. 552 * I hate to do this, but this is the easiest solution. 553 */ 554 union sockunion tmp_addr; 555 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 556 557 tmp_addr = his_addr; 558 memset(&his_addr, 0, sizeof(his_addr)); 559 his_addr.su_sin.sin_family = AF_INET; 560 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 561 memcpy(&his_addr.su_sin.sin_addr, 562 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 563 sizeof(his_addr.su_sin.sin_addr)); 564 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 565 566 tmp_addr = ctrl_addr; 567 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 568 ctrl_addr.su_sin.sin_family = AF_INET; 569 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 570 memcpy(&ctrl_addr.su_sin.sin_addr, 571 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 572 sizeof(ctrl_addr.su_sin.sin_addr)); 573 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 574#else 575 while (fgets(line, sizeof(line), fd) != NULL) { 576 line[strcspn(line, "\n")] = '\0'; 577 lreply(530, "%s", line); 578 } 579 (void) fflush(stdout); 580 (void) close(fd); 581 reply(530, 582 "Connection from IPv4 mapped address is not supported."); 583 exit(0); 584#endif 585 } 586#ifdef IP_TOS 587 if (his_addr.su_family == AF_INET) { 588 tos = IPTOS_LOWDELAY; 589 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, 590 sizeof(int)) < 0) 591 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 592 } 593#endif 594 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 595 596 /* Try to handle urgent data inline */ 597#ifdef SO_OOBINLINE 598 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 599 syslog(LOG_ERR, "setsockopt: %m"); 600#endif 601 602 dolog((struct sockaddr *)&his_addr); 603 604 /* 605 * Set up default state 606 */ 607 data = -1; 608 type = TYPE_A; 609 form = FORM_N; 610 stru = STRU_F; 611 mode = MODE_S; 612 tmpline[0] = '\0'; 613 614 /* If logins are disabled, print out the message. */ 615 if ((fp = fopen(_PATH_NOLOGIN, "r")) != NULL) { 616 while (fgets(line, sizeof(line), fp) != NULL) { 617 line[strcspn(line, "\n")] = '\0'; 618 lreply(530, "%s", line); 619 } 620 (void) fflush(stdout); 621 (void) fclose(fp); 622 reply(530, "System not available."); 623 exit(0); 624 } 625 if ((fp = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 626 while (fgets(line, sizeof(line), fp) != NULL) { 627 line[strcspn(line, "\n")] = '\0'; 628 lreply(220, "%s", line); 629 } 630 (void) fflush(stdout); 631 (void) fclose(fp); 632 /* reply(220,) must follow */ 633 } 634 (void) gethostname(hostname, sizeof(hostname)); 635 636 /* Make sure hostname is fully qualified. */ 637 hp = gethostbyname(hostname); 638 if (hp != NULL) 639 strlcpy(hostname, hp->h_name, sizeof(hostname)); 640 641 if (multihome) { 642 error = getnameinfo((struct sockaddr *)&ctrl_addr, 643 ctrl_addr.su_len, dhostname, sizeof(dhostname), NULL, 0, 0); 644 } 645 646 if (error != 0) 647 reply(220, "FTP server ready."); 648 else 649 reply(220, "%s FTP server ready.", 650 (multihome ? dhostname : hostname)); 651 652 monitor_init(); 653 654 for (;;) 655 (void) yyparse(); 656 /* NOTREACHED */ 657} 658 659/* 660 * Signal handlers. 661 */ 662/*ARGSUSED*/ 663static void 664lostconn(int signo) 665{ 666 struct syslog_data sdata = SYSLOG_DATA_INIT; 667 668 sdata.log_fac = LOG_FTP; 669 if (debug) 670 syslog_r(LOG_DEBUG, &sdata, "lost connection"); 671 dologout(1); 672} 673 674static void 675sigquit(int signo) 676{ 677 struct syslog_data sdata = SYSLOG_DATA_INIT; 678 679 sdata.log_fac = LOG_FTP; 680 syslog_r(LOG_DEBUG, &sdata, "got signal %s", sys_signame[signo]); 681 dologout(1); 682} 683 684/* 685 * Save the result of a getpwnam. Used for USER command, since 686 * the data returned must not be clobbered by any other command 687 * (e.g., globbing). 688 */ 689static struct passwd * 690sgetpwnam(char *name, struct passwd *pw) 691{ 692 static struct passwd *save; 693 struct passwd *old; 694 695 if (pw == NULL && (pw = getpwnam(name)) == NULL) 696 return (NULL); 697 old = save; 698 save = pw_dup(pw); 699 if (save == NULL) { 700 perror_reply(421, "Local resource failure: malloc"); 701 dologout(1); 702 /* NOTREACHED */ 703 } 704 if (old) { 705 memset(old->pw_passwd, 0, strlen(old->pw_passwd)); 706 free(old); 707 } 708 return (save); 709} 710 711static int login_attempts; /* number of failed login attempts */ 712static int askpasswd; /* had user command, ask for passwd */ 713static char curname[MAXLOGNAME]; /* current USER name */ 714 715/* 716 * USER command. 717 * Sets global passwd pointer pw if named account exists and is acceptable; 718 * sets askpasswd if a PASS command is expected. If logged in previously, 719 * need to reset state. If name is "ftp" or "anonymous", the name is not in 720 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 721 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 722 * requesting login privileges. Disallow anyone who does not have a standard 723 * shell as returned by getusershell(). Disallow anyone mentioned in the file 724 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 725 */ 726void 727user(char *name) 728{ 729 char *cp, *shell, *style, *host; 730 char *class = NULL; 731 732 if (logged_in) { 733 kill_slave("user already logged in"); 734 end_login(); 735 } 736 737 /* Close session from previous user if there was one. */ 738 if (as) { 739 auth_close(as); 740 as = NULL; 741 } 742 if (lc) { 743 login_close(lc); 744 lc = NULL; 745 } 746 747 if ((style = strchr(name, ':')) != NULL) 748 *style++ = 0; 749 750 guest = 0; 751 host = multihome ? dhostname : hostname; 752 if (anon_ok && 753 (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0)) { 754 if (checkuser(_PATH_FTPUSERS, "ftp") || 755 checkuser(_PATH_FTPUSERS, "anonymous")) 756 reply(530, "User %s access denied.", name); 757 else if ((pw = sgetpwnam("ftp", NULL)) != NULL) { 758 guest = 1; 759 askpasswd = 1; 760 lc = login_getclass(pw->pw_class); 761 if ((as = auth_open()) == NULL || 762 auth_setpwd(as, pw) != 0 || 763 auth_setoption(as, "FTPD_HOST", host) < 0) { 764 if (as) { 765 auth_close(as); 766 as = NULL; 767 } 768 login_close(lc); 769 lc = NULL; 770 reply(421, "Local resource failure"); 771 return; 772 } 773 reply(331, 774 "Guest login ok, send your email address as password."); 775 } else 776 reply(530, "User %s unknown.", name); 777 if (!askpasswd && logging) 778 syslog(LOG_NOTICE, 779 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 780 return; 781 } 782 783 shell = _PATH_BSHELL; 784 if ((pw = sgetpwnam(name, NULL))) { 785 class = pw->pw_class; 786 if (pw->pw_shell != NULL && *pw->pw_shell != '\0') 787 shell = pw->pw_shell; 788 while ((cp = getusershell()) != NULL) 789 if (strcmp(cp, shell) == 0) 790 break; 791 shell = cp; 792 endusershell(); 793 } 794 795 /* Get login class; if invalid style treat like unknown user. */ 796 lc = login_getclass(class); 797 if (lc && (style = login_getstyle(lc, style, "auth-ftp")) == NULL) { 798 login_close(lc); 799 lc = NULL; 800 pw = NULL; 801 } 802 803 /* Do pre-authentication setup. */ 804 if (lc && ((as = auth_open()) == NULL || 805 (pw != NULL && auth_setpwd(as, pw) != 0) || 806 auth_setitem(as, AUTHV_STYLE, style) < 0 || 807 auth_setitem(as, AUTHV_NAME, name) < 0 || 808 auth_setitem(as, AUTHV_CLASS, class) < 0 || 809 auth_setoption(as, "login", "yes") < 0 || 810 auth_setoption(as, "notickets", "yes") < 0 || 811 auth_setoption(as, "FTPD_HOST", host) < 0)) { 812 if (as) { 813 auth_close(as); 814 as = NULL; 815 } 816 login_close(lc); 817 lc = NULL; 818 reply(421, "Local resource failure"); 819 return; 820 } 821 if (logging) 822 strlcpy(curname, name, sizeof(curname)); 823 824 dochroot = (lc && login_getcapbool(lc, "ftp-chroot", 0)) || 825 checkuser(_PATH_FTPCHROOT, name); 826 if (anon_only && !dochroot) { 827 if (anon_ok) 828 reply(530, "Sorry, only anonymous ftp allowed."); 829 else 830 reply(530, "User %s access denied.", name); 831 return; 832 } 833 if (pw) { 834 if ((!shell && !dochroot) || checkuser(_PATH_FTPUSERS, name)) { 835 reply(530, "User %s access denied.", name); 836 if (logging) 837 syslog(LOG_NOTICE, 838 "FTP LOGIN REFUSED FROM %s, %s", 839 remotehost, name); 840 pw = NULL; 841 return; 842 } 843 } 844 845 if (as != NULL && (cp = auth_challenge(as)) != NULL) 846 reply(331, "%s", cp); 847 else 848 reply(331, "Password required for %s.", name); 849 850 askpasswd = 1; 851 /* 852 * Delay before reading passwd after first failed 853 * attempt to slow down passwd-guessing programs. 854 */ 855 if (login_attempts) 856 sleep((unsigned) login_attempts); 857} 858 859/* 860 * Check if a user is in the file "fname" 861 */ 862static int 863checkuser(char *fname, char *name) 864{ 865 FILE *fp; 866 int found = 0; 867 char *p, line[BUFSIZ]; 868 869 if ((fp = fopen(fname, "r")) != NULL) { 870 while (fgets(line, sizeof(line), fp) != NULL) 871 if ((p = strchr(line, '\n')) != NULL) { 872 *p = '\0'; 873 if (line[0] == '#') 874 continue; 875 if (strcmp(line, name) == 0) { 876 found = 1; 877 break; 878 } 879 } 880 (void) fclose(fp); 881 } 882 return (found); 883} 884 885/* 886 * Terminate login as previous user, if any, resetting state; 887 * used when USER command is given or login fails. 888 */ 889static void 890end_login(void) 891{ 892 sigprocmask (SIG_BLOCK, &allsigs, NULL); 893 if (logged_in) { 894 ftpdlogwtmp(ttyline, "", ""); 895 if (doutmp) 896 ftpd_logout(utmp.ut_line); 897 } 898 reply(530, "Please reconnect to work as another user"); 899 _exit(0); 900} 901 902enum auth_ret 903pass(char *passwd) 904{ 905 int authok; 906 unsigned int flags; 907 FILE *fp; 908 static char homedir[MAXPATHLEN]; 909 char *motd, *dir, rootdir[MAXPATHLEN]; 910 size_t sz_pw_dir; 911 912 if (logged_in || askpasswd == 0) { 913 reply(503, "Login with USER first."); 914 return (AUTH_FAILED); 915 } 916 askpasswd = 0; 917 if (!guest) { /* "ftp" is only account allowed no password */ 918 authok = 0; 919 if (pw == NULL || pw->pw_passwd[0] == '\0') { 920 useconds_t us; 921 922 /* Sleep between 1 and 3 seconds to emulate a crypt. */ 923 us = arc4random_uniform(3000000); 924 usleep(us); 925 if (as != NULL) { 926 auth_close(as); 927 as = NULL; 928 } 929 } else { 930 authok = auth_userresponse(as, passwd, 0); 931 as = NULL; 932 } 933 if (authok == 0) { 934 reply(530, "Login incorrect."); 935 if (logging) 936 syslog(LOG_NOTICE, 937 "FTP LOGIN FAILED FROM %s, %s", 938 remotehost, curname); 939 pw = NULL; 940 if (login_attempts++ >= 5) { 941 syslog(LOG_NOTICE, 942 "repeated login failures from %s", 943 remotehost); 944 kill_slave("repeated login failures"); 945 _exit(0); 946 } 947 return (AUTH_FAILED); 948 } 949 } else if (lc != NULL) { 950 /* Save anonymous' password. */ 951 if (guestpw != NULL) 952 free(guestpw); 953 guestpw = strdup(passwd); 954 if (guestpw == NULL) { 955 kill_slave("out of mem"); 956 fatal("Out of memory."); 957 } 958 959 authok = auth_approval(as, lc, pw->pw_name, "ftp"); 960 auth_close(as); 961 as = NULL; 962 if (authok == 0) { 963 syslog(LOG_INFO|LOG_AUTH, 964 "FTP LOGIN FAILED (HOST) as %s: approval failure.", 965 pw->pw_name); 966 reply(530, "Approval failure."); 967 kill_slave("approval failure"); 968 _exit(0); 969 } 970 } else { 971 syslog(LOG_INFO|LOG_AUTH, 972 "FTP LOGIN CLASS %s MISSING for %s: approval failure.", 973 pw->pw_class, pw->pw_name); 974 reply(530, "Permission denied."); 975 kill_slave("permission denied"); 976 _exit(0); 977 } 978 979 if (monitor_post_auth() == 1) { 980 /* Post-auth monitor process */ 981 logged_in = 1; 982 return (AUTH_MONITOR); 983 } 984 985 login_attempts = 0; /* this time successful */ 986 /* set umask via setusercontext() unless -u flag was given. */ 987 flags = LOGIN_SETGROUP|LOGIN_SETPRIORITY|LOGIN_SETRESOURCES; 988 if (umaskchange) 989 flags |= LOGIN_SETUMASK; 990 else 991 (void) umask(defumask); 992 if (setusercontext(lc, pw, (uid_t)0, flags) != 0) { 993 perror_reply(451, "Local resource failure: setusercontext"); 994 syslog(LOG_NOTICE, "setusercontext: %m"); 995 dologout(1); 996 /* NOTREACHED */ 997 } 998 999 /* open wtmp before chroot */ 1000 ftpdlogwtmp(ttyline, pw->pw_name, remotehost); 1001 1002 /* open utmp before chroot */ 1003 if (doutmp) { 1004 memset((void *)&utmp, 0, sizeof(utmp)); 1005 (void)time(&utmp.ut_time); 1006 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 1007 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 1008 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 1009 ftpd_login(&utmp); 1010 } 1011 1012 /* open stats file before chroot */ 1013 if (guest && (stats == 1) && (statfd < 0)) 1014 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1015 stats = 0; 1016 1017 logged_in = 1; 1018 1019 if ((dir = login_getcapstr(lc, "ftp-dir", NULL, NULL))) { 1020 char *newdir; 1021 1022 newdir = copy_dir(dir, pw); 1023 if (newdir == NULL) { 1024 perror_reply(421, "Local resource failure: malloc"); 1025 dologout(1); 1026 /* NOTREACHED */ 1027 } 1028 pw->pw_dir = newdir; 1029 pw = sgetpwnam(NULL, pw); 1030 free(dir); 1031 free(newdir); 1032 } 1033 1034 /* make sure pw->pw_dir is big enough to hold "/" */ 1035 sz_pw_dir = strlen(pw->pw_dir) + 1; 1036 if (sz_pw_dir < 2) { 1037 pw->pw_dir = "/"; 1038 pw = sgetpwnam(NULL, pw); 1039 sz_pw_dir = 2; 1040 } 1041 1042 if (guest || dochroot) { 1043 if (multihome && guest) { 1044 struct stat ts; 1045 1046 /* Compute root directory. */ 1047 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1048 pw->pw_dir, dhostname); 1049 if (stat(rootdir, &ts) < 0) { 1050 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1051 pw->pw_dir, hostname); 1052 } 1053 } else 1054 strlcpy(rootdir, pw->pw_dir, sizeof(rootdir)); 1055 } 1056 if (guest) { 1057 /* 1058 * We MUST do a chdir() after the chroot. Otherwise 1059 * the old current directory will be accessible as "." 1060 * outside the new root! 1061 */ 1062 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1063 reply(550, "Can't set guest privileges."); 1064 goto bad; 1065 } 1066 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1067 if (setenv("HOME", "/", 1) == -1) { 1068 reply(550, "Can't setup environment."); 1069 goto bad; 1070 } 1071 } else if (dochroot) { 1072 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1073 reply(550, "Can't change root."); 1074 goto bad; 1075 } 1076 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1077 if (setenv("HOME", "/", 1) == -1) { 1078 reply(550, "Can't setup environment."); 1079 goto bad; 1080 } 1081 } else if (chdir(pw->pw_dir) < 0) { 1082 if (chdir("/") < 0) { 1083 reply(530, "User %s: can't change directory to %s.", 1084 pw->pw_name, pw->pw_dir); 1085 goto bad; 1086 } else 1087 lreply(230, "No directory! Logging in with home=/"); 1088 } 1089 if (setegid(pw->pw_gid) < 0 || setgid(pw->pw_gid) < 0) { 1090 reply(550, "Can't set gid."); 1091 goto bad; 1092 } 1093 if (seteuid(pw->pw_uid) < 0 || setuid(pw->pw_uid) < 0) { 1094 reply(550, "Can't set uid."); 1095 goto bad; 1096 } 1097 sigprocmask(SIG_UNBLOCK, &allsigs, NULL); 1098 1099 /* 1100 * Set home directory so that use of ~ (tilde) works correctly. 1101 */ 1102 if (getcwd(homedir, MAXPATHLEN) != NULL) { 1103 if (setenv("HOME", homedir, 1) == -1) { 1104 reply(550, "Can't setup environment."); 1105 goto bad; 1106 } 1107 } 1108 1109 /* 1110 * Display a login message, if it exists. 1111 * N.B. reply(230,) must follow the message. 1112 */ 1113 motd = login_getcapstr(lc, "welcome", NULL, NULL); 1114 if ((fp = fopen(motd ? motd : _PATH_FTPLOGINMESG, "r")) != NULL) { 1115 char line[LINE_MAX]; 1116 1117 while (fgets(line, sizeof(line), fp) != NULL) { 1118 line[strcspn(line, "\n")] = '\0'; 1119 lreply(230, "%s", line); 1120 } 1121 (void) fflush(stdout); 1122 (void) fclose(fp); 1123 } 1124 if (motd != NULL) 1125 free(motd); 1126 if (guest) { 1127 if (ident != NULL) 1128 free(ident); 1129 ident = strdup(passwd); 1130 if (ident == NULL) 1131 fatal("Ran out of memory."); 1132 reply(230, "Guest login ok, access restrictions apply."); 1133#ifdef HASSETPROCTITLE 1134 snprintf(proctitle, sizeof(proctitle), 1135 "%s: anonymous/%.*s", remotehost, 1136 (int)(sizeof(proctitle) - sizeof(remotehost) - 1137 sizeof(": anonymous/")), passwd); 1138 setproctitle("%s", proctitle); 1139#endif /* HASSETPROCTITLE */ 1140 if (logging) 1141 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1142 remotehost, passwd); 1143 } else { 1144 reply(230, "User %s logged in.", pw->pw_name); 1145#ifdef HASSETPROCTITLE 1146 snprintf(proctitle, sizeof(proctitle), 1147 "%s: %s", remotehost, pw->pw_name); 1148 setproctitle("%s", proctitle); 1149#endif /* HASSETPROCTITLE */ 1150 if (logging) 1151 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1152 remotehost, pw->pw_name); 1153 } 1154 login_close(lc); 1155 lc = NULL; 1156 return (AUTH_SLAVE); 1157bad: 1158 /* Forget all about it... */ 1159 login_close(lc); 1160 lc = NULL; 1161 end_login(); 1162 return (AUTH_FAILED); 1163} 1164 1165void 1166retrieve(char *cmd, char *name) 1167{ 1168 FILE *fin, *dout; 1169 struct stat st; 1170 int (*closefunc)(FILE *); 1171 time_t start; 1172 1173 if (cmd == 0) { 1174 fin = fopen(name, "r"), closefunc = fclose; 1175 st.st_size = 0; 1176 } else { 1177 char line[BUFSIZ]; 1178 1179 (void) snprintf(line, sizeof(line), cmd, name); 1180 name = line; 1181 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1182 st.st_size = -1; 1183 st.st_blksize = BUFSIZ; 1184 } 1185 if (fin == NULL) { 1186 if (errno != 0) { 1187 perror_reply(550, name); 1188 if (cmd == 0) { 1189 LOGCMD("get", name); 1190 } 1191 } 1192 return; 1193 } 1194 byte_count = -1; 1195 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1196 reply(550, "%s: not a plain file.", name); 1197 goto done; 1198 } 1199 if (restart_point) { 1200 if (type == TYPE_A) { 1201 off_t i, n; 1202 int c; 1203 1204 n = restart_point; 1205 i = 0; 1206 while (i++ < n) { 1207 if ((c = getc(fin)) == EOF) { 1208 if (ferror(fin)) { 1209 perror_reply(550, name); 1210 goto done; 1211 } else 1212 break; 1213 } 1214 if (c == '\n') 1215 i++; 1216 } 1217 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1218 perror_reply(550, name); 1219 goto done; 1220 } 1221 } 1222 dout = dataconn(name, st.st_size, "w"); 1223 if (dout == NULL) 1224 goto done; 1225 time(&start); 1226 send_data(fin, dout, (off_t)st.st_blksize, st.st_size, 1227 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 1228 if ((cmd == 0) && stats) 1229 logxfer(name, byte_count, start); 1230 (void) fclose(dout); 1231 data = -1; 1232done: 1233 if (pdata >= 0) 1234 (void) close(pdata); 1235 pdata = -1; 1236 if (cmd == 0) 1237 LOGBYTES("get", name, byte_count); 1238 (*closefunc)(fin); 1239} 1240 1241void 1242store(char *name, char *mode, int unique) 1243{ 1244 FILE *fout, *din; 1245 int (*closefunc)(FILE *); 1246 struct stat st; 1247 int fd; 1248 1249 if (restart_point && *mode != 'a') 1250 mode = "r+"; 1251 1252 if (unique && stat(name, &st) == 0) { 1253 char *nam; 1254 1255 fd = guniquefd(name, &nam); 1256 if (fd == -1) { 1257 LOGCMD(*mode == 'w' ? "put" : "append", name); 1258 return; 1259 } 1260 name = nam; 1261 fout = fdopen(fd, mode); 1262 } else 1263 fout = fopen(name, mode); 1264 1265 closefunc = fclose; 1266 if (fout == NULL) { 1267 perror_reply(553, name); 1268 LOGCMD(*mode == 'w' ? "put" : "append", name); 1269 return; 1270 } 1271 byte_count = -1; 1272 if (restart_point) { 1273 if (type == TYPE_A) { 1274 off_t i, n; 1275 int c; 1276 1277 n = restart_point; 1278 i = 0; 1279 while (i++ < n) { 1280 if ((c = getc(fout)) == EOF) { 1281 if (ferror(fout)) { 1282 perror_reply(550, name); 1283 goto done; 1284 } else 1285 break; 1286 } 1287 if (c == '\n') 1288 i++; 1289 } 1290 /* 1291 * We must do this seek to "current" position 1292 * because we are changing from reading to 1293 * writing. 1294 */ 1295 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1296 perror_reply(550, name); 1297 goto done; 1298 } 1299 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1300 perror_reply(550, name); 1301 goto done; 1302 } 1303 } 1304 din = dataconn(name, (off_t)-1, "r"); 1305 if (din == NULL) 1306 goto done; 1307 if (receive_data(din, fout) == 0) { 1308 if (unique) 1309 reply(226, "Transfer complete (unique file name:%s).", 1310 name); 1311 else 1312 reply(226, "Transfer complete."); 1313 } 1314 (void) fclose(din); 1315 data = -1; 1316 pdata = -1; 1317done: 1318 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1319 (*closefunc)(fout); 1320} 1321 1322static FILE * 1323getdatasock(char *mode) 1324{ 1325 int on = 1, s, t, tries; 1326 1327 if (data >= 0) 1328 return (fdopen(data, mode)); 1329 sigprocmask (SIG_BLOCK, &allsigs, NULL); 1330 s = monitor_socket(ctrl_addr.su_family); 1331 if (s < 0) 1332 goto bad; 1333 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1334 &on, sizeof(on)) < 0) 1335 goto bad; 1336 /* anchor socket to avoid multi-homing problems */ 1337 data_source = ctrl_addr; 1338 data_source.su_port = htons(20); /* ftp-data port */ 1339 for (tries = 1; ; tries++) { 1340 if (monitor_bind(s, (struct sockaddr *)&data_source, 1341 data_source.su_len) >= 0) 1342 break; 1343 if (errno != EADDRINUSE || tries > 10) 1344 goto bad; 1345 sleep((unsigned int)tries); 1346 } 1347 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1348 1349#ifdef IP_TOS 1350 if (ctrl_addr.su_family == AF_INET) { 1351 on = IPTOS_THROUGHPUT; 1352 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, 1353 sizeof(int)) < 0) 1354 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1355 } 1356#endif 1357#ifdef TCP_NOPUSH 1358 /* 1359 * Turn off push flag to keep sender TCP from sending short packets 1360 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1361 * to set the send buffer size as well, but that may not be desirable 1362 * in heavy-load situations. 1363 */ 1364 on = 1; 1365 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof(on)) < 0) 1366 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1367#endif 1368#ifdef SO_SNDBUF 1369 on = 65536; 1370 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof(on)) < 0) 1371 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1372#endif 1373 1374 return (fdopen(s, mode)); 1375bad: 1376 /* Return the real value of errno (close may change it) */ 1377 t = errno; 1378 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1379 if (s >= 0) 1380 (void) close(s); 1381 errno = t; 1382 return (NULL); 1383} 1384 1385static FILE * 1386dataconn(char *name, off_t size, char *mode) 1387{ 1388 char sizebuf[32]; 1389 FILE *file = NULL; 1390 int retry = 0; 1391 in_port_t *p; 1392 u_char *fa, *ha; 1393 size_t alen; 1394 int error; 1395 1396 file_size = size; 1397 byte_count = 0; 1398 if (size != (off_t) -1) { 1399 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1400 size); 1401 } else 1402 sizebuf[0] = '\0'; 1403 if (pdata >= 0) { 1404 union sockunion from; 1405 int s; 1406 socklen_t fromlen = sizeof(from); 1407 1408 (void) alarm ((unsigned) timeout); 1409 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1410 (void) alarm (0); 1411 if (s < 0) { 1412 reply(425, "Can't open data connection."); 1413 (void) close(pdata); 1414 pdata = -1; 1415 return (NULL); 1416 } 1417 switch (from.su_family) { 1418 case AF_INET: 1419 p = (in_port_t *)&from.su_sin.sin_port; 1420 fa = (u_char *)&from.su_sin.sin_addr; 1421 ha = (u_char *)&his_addr.su_sin.sin_addr; 1422 alen = sizeof(struct in_addr); 1423 break; 1424 case AF_INET6: 1425 p = (in_port_t *)&from.su_sin6.sin6_port; 1426 fa = (u_char *)&from.su_sin6.sin6_addr; 1427 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1428 alen = sizeof(struct in6_addr); 1429 break; 1430 default: 1431 reply(425, "Can't build data connection: " 1432 "unknown address family"); 1433 (void) close(pdata); 1434 (void) close(s); 1435 pdata = -1; 1436 return (NULL); 1437 } 1438 if (from.su_family != his_addr.su_family || 1439 ntohs(*p) < IPPORT_RESERVED) { 1440 reply(425, "Can't build data connection: " 1441 "address family or port error"); 1442 (void) close(pdata); 1443 (void) close(s); 1444 pdata = -1; 1445 return (NULL); 1446 } 1447 if (portcheck && memcmp(fa, ha, alen) != 0) { 1448 reply(435, "Can't build data connection: " 1449 "illegal port number"); 1450 (void) close(pdata); 1451 (void) close(s); 1452 pdata = -1; 1453 return (NULL); 1454 } 1455 (void) close(pdata); 1456 pdata = s; 1457 reply(150, "Opening %s mode data connection for '%s'%s.", 1458 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1459 return (fdopen(pdata, mode)); 1460 } 1461 if (data >= 0) { 1462 reply(125, "Using existing data connection for '%s'%s.", 1463 name, sizebuf); 1464 usedefault = 1; 1465 return (fdopen(data, mode)); 1466 } 1467 if (usedefault) 1468 data_dest = his_addr; 1469 usedefault = 1; 1470 do { 1471 if (file != NULL) 1472 (void) fclose(file); 1473 file = getdatasock(mode); 1474 if (file == NULL) { 1475 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1476 1477 error = getnameinfo((struct sockaddr *)&data_source, 1478 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 1479 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV); 1480 if (error != 0) 1481 reply(425, "Can't create data socket: %s.", 1482 strerror(errno)); 1483 else 1484 reply(425, 1485 "Can't create data socket (%s,%s): %s.", 1486 hbuf, pbuf, strerror(errno)); 1487 return (NULL); 1488 } 1489 1490 /* 1491 * attempt to connect to reserved port on client machine; 1492 * this looks like an attack 1493 */ 1494 switch (data_dest.su_family) { 1495 case AF_INET: 1496 p = (in_port_t *)&data_dest.su_sin.sin_port; 1497 fa = (u_char *)&data_dest.su_sin.sin_addr; 1498 ha = (u_char *)&his_addr.su_sin.sin_addr; 1499 alen = sizeof(struct in_addr); 1500 break; 1501 case AF_INET6: 1502 p = (in_port_t *)&data_dest.su_sin6.sin6_port; 1503 fa = (u_char *)&data_dest.su_sin6.sin6_addr; 1504 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1505 alen = sizeof(struct in6_addr); 1506 break; 1507 default: 1508 reply(425, "Can't build data connection: " 1509 "unknown address family"); 1510 (void) fclose(file); 1511 pdata = -1; 1512 return (NULL); 1513 } 1514 if (data_dest.su_family != his_addr.su_family || 1515 ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */ 1516 reply(425, "Can't build data connection: " 1517 "address family or port error"); 1518 (void) fclose(file); 1519 return NULL; 1520 } 1521 if (portcheck && memcmp(fa, ha, alen) != 0) { 1522 reply(435, "Can't build data connection: " 1523 "illegal port number"); 1524 (void) fclose(file); 1525 return NULL; 1526 } 1527 1528 if (connect(fileno(file), (struct sockaddr *)&data_dest, 1529 data_dest.su_len) == 0) { 1530 reply(150, "Opening %s mode data connection for '%s'%s.", 1531 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1532 data = fileno(file); 1533 return (file); 1534 } 1535 if (errno != EADDRINUSE) 1536 break; 1537 sleep((unsigned) swaitint); 1538 retry += swaitint; 1539 } while (retry <= swaitmax); 1540 perror_reply(425, "Can't build data connection"); 1541 (void) fclose(file); 1542 return (NULL); 1543} 1544 1545/* 1546 * Transfer the contents of "instr" to "outstr" peer using the appropriate 1547 * encapsulation of the data subject to Mode, Structure, and Type. 1548 * 1549 * NB: Form isn't handled. 1550 */ 1551static int 1552send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1553{ 1554 int c, cnt, filefd, netfd; 1555 char *buf, *bp; 1556 size_t len; 1557 1558 transflag++; 1559 switch (type) { 1560 1561 case TYPE_A: 1562 while ((c = getc(instr)) != EOF) { 1563 if (recvurg) 1564 goto got_oob; 1565 byte_count++; 1566 if (c == '\n') { 1567 if (ferror(outstr)) 1568 goto data_err; 1569 (void) putc('\r', outstr); 1570 } 1571 (void) putc(c, outstr); 1572 } 1573 fflush(outstr); 1574 transflag = 0; 1575 if (ferror(instr)) 1576 goto file_err; 1577 if (ferror(outstr)) 1578 goto data_err; 1579 reply(226, "Transfer complete."); 1580 return(0); 1581 1582 case TYPE_I: 1583 case TYPE_L: 1584 /* 1585 * isreg is only set if we are not doing restart and we 1586 * are sending a regular file 1587 */ 1588 netfd = fileno(outstr); 1589 filefd = fileno(instr); 1590 1591 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1592 size_t fsize = (size_t)filesize; 1593 1594 buf = mmap(0, fsize, PROT_READ, MAP_SHARED, filefd, 1595 (off_t)0); 1596 if (buf == MAP_FAILED) { 1597 syslog(LOG_WARNING, "mmap(%llu): %m", 1598 (unsigned long long)fsize); 1599 goto oldway; 1600 } 1601 bp = buf; 1602 len = fsize; 1603 do { 1604 cnt = write(netfd, bp, len); 1605 if (recvurg) { 1606 munmap(buf, fsize); 1607 goto got_oob; 1608 } 1609 len -= cnt; 1610 bp += cnt; 1611 if (cnt > 0) 1612 byte_count += cnt; 1613 } while(cnt > 0 && len > 0); 1614 1615 transflag = 0; 1616 munmap(buf, fsize); 1617 if (cnt < 0) 1618 goto data_err; 1619 reply(226, "Transfer complete."); 1620 return(0); 1621 } 1622 1623oldway: 1624 if ((buf = malloc((size_t)blksize)) == NULL) { 1625 transflag = 0; 1626 perror_reply(451, "Local resource failure: malloc"); 1627 return(-1); 1628 } 1629 1630 while ((cnt = read(filefd, buf, (size_t)blksize)) > 0 && 1631 write(netfd, buf, cnt) == cnt) 1632 byte_count += cnt; 1633 transflag = 0; 1634 (void)free(buf); 1635 if (cnt != 0) { 1636 if (cnt < 0) 1637 goto file_err; 1638 goto data_err; 1639 } 1640 reply(226, "Transfer complete."); 1641 return(0); 1642 default: 1643 transflag = 0; 1644 reply(550, "Unimplemented TYPE %d in send_data", type); 1645 return(-1); 1646 } 1647 1648data_err: 1649 transflag = 0; 1650 reply(426, "Data connection"); 1651 return(-1); 1652 1653file_err: 1654 transflag = 0; 1655 reply(551, "Error on input file"); 1656 return(-1); 1657 1658got_oob: 1659 myoob(); 1660 recvurg = 0; 1661 transflag = 0; 1662 return(-1); 1663} 1664 1665/* 1666 * Transfer data from peer to "outstr" using the appropriate encapulation of 1667 * the data subject to Mode, Structure, and Type. 1668 * 1669 * N.B.: Form isn't handled. 1670 */ 1671static int 1672receive_data(FILE *instr, FILE *outstr) 1673{ 1674 int c; 1675 int cnt; 1676 char buf[BUFSIZ]; 1677 struct sigaction sa, sa_saved; 1678 volatile int bare_lfs = 0; 1679 1680 transflag++; 1681 switch (type) { 1682 1683 case TYPE_I: 1684 case TYPE_L: 1685 memset(&sa, 0, sizeof(sa)); 1686 sigfillset(&sa.sa_mask); 1687 sa.sa_flags = SA_RESTART; 1688 sa.sa_handler = lostconn; 1689 (void) sigaction(SIGALRM, &sa, &sa_saved); 1690 do { 1691 (void) alarm ((unsigned) timeout); 1692 cnt = read(fileno(instr), buf, sizeof(buf)); 1693 (void) alarm (0); 1694 if (recvurg) 1695 goto got_oob; 1696 1697 if (cnt > 0) { 1698 if (write(fileno(outstr), buf, cnt) != cnt) 1699 goto file_err; 1700 byte_count += cnt; 1701 } 1702 } while (cnt > 0); 1703 (void) sigaction(SIGALRM, &sa_saved, NULL); 1704 if (cnt < 0) 1705 goto data_err; 1706 transflag = 0; 1707 return (0); 1708 1709 case TYPE_E: 1710 reply(553, "TYPE E not implemented."); 1711 transflag = 0; 1712 return (-1); 1713 1714 case TYPE_A: 1715 while ((c = getc(instr)) != EOF) { 1716 if (recvurg) 1717 goto got_oob; 1718 byte_count++; 1719 if (c == '\n') 1720 bare_lfs++; 1721 while (c == '\r') { 1722 if (ferror(outstr)) 1723 goto data_err; 1724 if ((c = getc(instr)) != '\n') { 1725 (void) putc ('\r', outstr); 1726 if (c == '\0' || c == EOF) 1727 goto contin2; 1728 } 1729 } 1730 (void) putc(c, outstr); 1731 contin2: ; 1732 } 1733 fflush(outstr); 1734 if (ferror(instr)) 1735 goto data_err; 1736 if (ferror(outstr)) 1737 goto file_err; 1738 transflag = 0; 1739 if (bare_lfs) { 1740 lreply(226, 1741 "WARNING! %d bare linefeeds received in ASCII mode", 1742 bare_lfs); 1743 printf(" File may not have transferred correctly.\r\n"); 1744 } 1745 return (0); 1746 default: 1747 reply(550, "Unimplemented TYPE %d in receive_data", type); 1748 transflag = 0; 1749 return (-1); 1750 } 1751 1752data_err: 1753 transflag = 0; 1754 reply(426, "Data Connection"); 1755 return (-1); 1756 1757file_err: 1758 transflag = 0; 1759 reply(452, "Error writing file"); 1760 return (-1); 1761 1762got_oob: 1763 myoob(); 1764 recvurg = 0; 1765 transflag = 0; 1766 return (-1); 1767} 1768 1769void 1770statfilecmd(char *filename) 1771{ 1772 FILE *fin; 1773 int c; 1774 int atstart; 1775 char line[LINE_MAX]; 1776 1777 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1778 fin = ftpd_popen(line, "r"); 1779 lreply(211, "status of %s:", filename); 1780 atstart = 1; 1781 while ((c = getc(fin)) != EOF) { 1782 if (c == '\n') { 1783 if (ferror(stdout)){ 1784 perror_reply(421, "control connection"); 1785 (void) ftpd_pclose(fin); 1786 dologout(1); 1787 /* NOTREACHED */ 1788 } 1789 if (ferror(fin)) { 1790 perror_reply(551, filename); 1791 (void) ftpd_pclose(fin); 1792 return; 1793 } 1794 (void) putc('\r', stdout); 1795 } 1796 if (atstart && isdigit(c)) 1797 (void) putc(' ', stdout); 1798 (void) putc(c, stdout); 1799 atstart = (c == '\n'); 1800 } 1801 (void) ftpd_pclose(fin); 1802 reply(211, "End of Status"); 1803} 1804 1805void 1806statcmd(void) 1807{ 1808 union sockunion *su; 1809 u_char *a, *p; 1810 char hbuf[MAXHOSTNAMELEN]; 1811 int ispassive; 1812 int error; 1813 1814 lreply(211, "%s FTP server status:", hostname); 1815 error = getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1816 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST); 1817 printf(" Connected to %s", remotehost); 1818 if (error == 0 && strcmp(remotehost, hbuf) != 0) 1819 printf(" (%s)", hbuf); 1820 printf("\r\n"); 1821 if (logged_in) { 1822 if (guest) 1823 printf(" Logged in anonymously\r\n"); 1824 else 1825 printf(" Logged in as %s\r\n", pw->pw_name); 1826 } else if (askpasswd) 1827 printf(" Waiting for password\r\n"); 1828 else 1829 printf(" Waiting for user name\r\n"); 1830 printf(" TYPE: %s", typenames[type]); 1831 if (type == TYPE_A || type == TYPE_E) 1832 printf(", FORM: %s", formnames[form]); 1833 if (type == TYPE_L) 1834#if NBBY == 8 1835 printf(" %d", NBBY); 1836#else 1837 printf(" %d", bytesize); /* need definition! */ 1838#endif 1839 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1840 strunames[stru], modenames[mode]); 1841 ispassive = 0; 1842 if (data != -1) 1843 printf(" Data connection open\r\n"); 1844 else if (pdata != -1) { 1845 printf(" in Passive mode\r\n"); 1846 su = (union sockunion *)&pasv_addr; 1847 ispassive++; 1848 goto printaddr; 1849 } else if (usedefault == 0) { 1850 size_t alen; 1851 int af, i; 1852 1853 su = (union sockunion *)&data_dest; 1854printaddr: 1855 /* PASV/PORT */ 1856 if (su->su_family == AF_INET) { 1857 if (ispassive) 1858 printf("211- PASV "); 1859 else 1860 printf("211- PORT "); 1861 a = (u_char *)&su->su_sin.sin_addr; 1862 p = (u_char *)&su->su_sin.sin_port; 1863 printf("(%u,%u,%u,%u,%u,%u)\r\n", 1864 a[0], a[1], a[2], a[3], 1865 p[0], p[1]); 1866 } 1867 1868 /* LPSV/LPRT */ 1869 alen = 0; 1870 switch (su->su_family) { 1871 case AF_INET: 1872 a = (u_char *)&su->su_sin.sin_addr; 1873 p = (u_char *)&su->su_sin.sin_port; 1874 alen = sizeof(su->su_sin.sin_addr); 1875 af = 4; 1876 break; 1877 case AF_INET6: 1878 a = (u_char *)&su->su_sin6.sin6_addr; 1879 p = (u_char *)&su->su_sin6.sin6_port; 1880 alen = sizeof(su->su_sin6.sin6_addr); 1881 af = 6; 1882 break; 1883 default: 1884 af = 0; 1885 break; 1886 } 1887 if (af) { 1888 if (ispassive) 1889 printf("211- LPSV "); 1890 else 1891 printf("211- LPRT "); 1892 printf("(%u,%llu", af, (unsigned long long)alen); 1893 for (i = 0; i < alen; i++) 1894 printf(",%u", a[i]); 1895 printf(",%u,%u,%u)\r\n", 2, p[0], p[1]); 1896 } 1897 1898 /* EPRT/EPSV */ 1899 switch (su->su_family) { 1900 case AF_INET: 1901 af = 1; 1902 break; 1903 case AF_INET6: 1904 af = 2; 1905 break; 1906 default: 1907 af = 0; 1908 break; 1909 } 1910 if (af) { 1911 char pbuf[10]; 1912 union sockunion tmp = *su; 1913 1914 if (tmp.su_family == AF_INET6) 1915 tmp.su_sin6.sin6_scope_id = 0; 1916 if (getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 1917 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1918 NI_NUMERICHOST | NI_NUMERICSERV) == 0) { 1919 if (ispassive) 1920 printf("211- EPSV "); 1921 else 1922 printf("211- EPRT "); 1923 printf("(|%u|%s|%s|)\r\n", 1924 af, hbuf, pbuf); 1925 } 1926 } 1927 } else 1928 printf(" No data connection\r\n"); 1929 reply(211, "End of status"); 1930} 1931 1932void 1933fatal(char *s) 1934{ 1935 1936 reply(451, "Error in server: %s", s); 1937 reply(221, "Closing connection due to server error."); 1938 dologout(0); 1939 /* NOTREACHED */ 1940} 1941 1942void 1943reply(int n, const char *fmt, ...) 1944{ 1945 char *buf, *p, *next; 1946 int rval; 1947 va_list ap; 1948 1949 va_start(ap, fmt); 1950 rval = vasprintf(&buf, fmt, ap); 1951 va_end(ap); 1952 if (rval == -1 || buf == NULL) { 1953 printf("412 Local resource failure: malloc\r\n"); 1954 fflush(stdout); 1955 dologout(1); 1956 } 1957 next = buf; 1958 while ((p = strsep(&next, "\n\r"))) { 1959 printf("%d%s %s\r\n", n, (next != '\0') ? "-" : "", p); 1960 if (debug) 1961 syslog(LOG_DEBUG, "<--- %d%s %s", n, 1962 (next != '\0') ? "-" : "", p); 1963 } 1964 (void)fflush(stdout); 1965 free(buf); 1966} 1967 1968 1969void 1970reply_r(int n, const char *fmt, ...) 1971{ 1972 char *p, *next; 1973 char msg[BUFSIZ]; 1974 char buf[BUFSIZ]; 1975 va_list ap; 1976 struct syslog_data sdata = SYSLOG_DATA_INIT; 1977 1978 sdata.log_fac = LOG_FTP; 1979 va_start(ap, fmt); 1980 vsnprintf(msg, sizeof(msg), fmt, ap); 1981 va_end(ap); 1982 1983 next = msg; 1984 1985 while ((p = strsep(&next, "\n\r"))) { 1986 snprintf(buf, sizeof(buf), "%d%s %s\r\n", n, 1987 (next != '\0') ? "-" : "", p); 1988 write(STDOUT_FILENO, buf, strlen(buf)); 1989 if (debug) { 1990 buf[strlen(buf) - 2] = '\0'; 1991 syslog_r(LOG_DEBUG, &sdata, "<--- %s", buf); 1992 } 1993 } 1994} 1995 1996void 1997lreply(int n, const char *fmt, ...) 1998{ 1999 va_list ap; 2000 2001 va_start(ap, fmt); 2002 (void)printf("%d- ", n); 2003 (void)vprintf(fmt, ap); 2004 va_end(ap); 2005 (void)printf("\r\n"); 2006 (void)fflush(stdout); 2007 if (debug) { 2008 va_start(ap, fmt); 2009 syslog(LOG_DEBUG, "<--- %d- ", n); 2010 vsyslog(LOG_DEBUG, fmt, ap); 2011 va_end(ap); 2012 } 2013} 2014 2015static void 2016ack(char *s) 2017{ 2018 2019 reply(250, "%s command successful.", s); 2020} 2021 2022void 2023nack(char *s) 2024{ 2025 2026 reply(502, "%s command not implemented.", s); 2027} 2028 2029/* ARGSUSED */ 2030void 2031yyerror(char *s) 2032{ 2033 cbuf[strcspn(cbuf, "\n")] = '\0'; 2034 reply(500, "'%s': command not understood.", cbuf); 2035} 2036 2037void 2038delete(char *name) 2039{ 2040 struct stat st; 2041 2042 LOGCMD("delete", name); 2043 if (stat(name, &st) < 0) { 2044 perror_reply(550, name); 2045 return; 2046 } 2047 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2048 if (rmdir(name) < 0) { 2049 perror_reply(550, name); 2050 return; 2051 } 2052 goto done; 2053 } 2054 if (unlink(name) < 0) { 2055 perror_reply(550, name); 2056 return; 2057 } 2058done: 2059 ack("DELE"); 2060} 2061 2062void 2063cwd(char *path) 2064{ 2065 FILE *message; 2066 2067 if (chdir(path) < 0) 2068 perror_reply(550, path); 2069 else { 2070 if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) { 2071 char line[LINE_MAX]; 2072 2073 while (fgets(line, sizeof(line), message) != NULL) { 2074 line[strcspn(line, "\n")] = '\0'; 2075 lreply(250, "%s", line); 2076 } 2077 (void) fflush(stdout); 2078 (void) fclose(message); 2079 } 2080 ack("CWD"); 2081 } 2082} 2083 2084void 2085replydirname(const char *name, const char *message) 2086{ 2087 char *p, *ep; 2088 char npath[MAXPATHLEN * 2]; 2089 2090 p = npath; 2091 ep = &npath[sizeof(npath) - 1]; 2092 while (*name) { 2093 if (*name == '"') { 2094 if (ep - p < 2) 2095 break; 2096 *p++ = *name++; 2097 *p++ = '"'; 2098 } else { 2099 if (ep - p < 1) 2100 break; 2101 *p++ = *name++; 2102 } 2103 } 2104 *p = '\0'; 2105 reply(257, "\"%s\" %s", npath, message); 2106} 2107 2108void 2109makedir(char *name) 2110{ 2111 2112 LOGCMD("mkdir", name); 2113 if (mkdir(name, 0777) < 0) 2114 perror_reply(550, name); 2115 else 2116 replydirname(name, "directory created."); 2117} 2118 2119void 2120removedir(char *name) 2121{ 2122 2123 LOGCMD("rmdir", name); 2124 if (rmdir(name) < 0) 2125 perror_reply(550, name); 2126 else 2127 ack("RMD"); 2128} 2129 2130void 2131pwd(void) 2132{ 2133 char path[MAXPATHLEN]; 2134 2135 if (getcwd(path, sizeof(path)) == NULL) 2136 perror_reply(550, "Can't get current directory"); 2137 else 2138 replydirname(path, "is current directory."); 2139} 2140 2141char * 2142renamefrom(char *name) 2143{ 2144 struct stat st; 2145 2146 if (stat(name, &st) < 0) { 2147 perror_reply(550, name); 2148 return ((char *)0); 2149 } 2150 reply(350, "File exists, ready for destination name"); 2151 return (name); 2152} 2153 2154void 2155renamecmd(char *from, char *to) 2156{ 2157 2158 LOGCMD2("rename", from, to); 2159 if (rename(from, to) < 0) 2160 perror_reply(550, "rename"); 2161 else 2162 ack("RNTO"); 2163} 2164 2165static void 2166dolog(struct sockaddr *sa) 2167{ 2168 char hbuf[sizeof(remotehost)]; 2169 2170 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0) == 0) 2171 (void) strlcpy(remotehost, hbuf, sizeof(remotehost)); 2172 else 2173 (void) strlcpy(remotehost, "unknown", sizeof(remotehost)); 2174 2175#ifdef HASSETPROCTITLE 2176 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2177 setproctitle("%s", proctitle); 2178#endif /* HASSETPROCTITLE */ 2179 2180 if (logging) 2181 syslog(LOG_INFO, "connection from %s", remotehost); 2182} 2183 2184/* 2185 * Record logout in wtmp file and exit with supplied status. 2186 * NOTE: because this is called from signal handlers it cannot 2187 * use stdio (or call other functions that use stdio). 2188 */ 2189void 2190dologout(int status) 2191{ 2192 2193 transflag = 0; 2194 2195 if (logged_in) { 2196 sigprocmask(SIG_BLOCK, &allsigs, NULL); 2197 ftpdlogwtmp(ttyline, "", ""); 2198 if (doutmp) 2199 ftpd_logout(utmp.ut_line); 2200 } 2201 /* beware of flushing buffers after a SIGPIPE */ 2202 _exit(status); 2203} 2204 2205/*ARGSUSED*/ 2206static void 2207sigurg(int signo) 2208{ 2209 2210 recvurg = 1; 2211} 2212 2213static void 2214myoob(void) 2215{ 2216 char *cp; 2217 2218 /* only process if transfer occurring */ 2219 if (!transflag) 2220 return; 2221 cp = tmpline; 2222 if (getline(cp, 7, stdin) == NULL) { 2223 reply(221, "You could at least say goodbye."); 2224 dologout(0); 2225 } 2226 upper(cp); 2227 if (strcmp(cp, "ABOR\r\n") == 0) { 2228 tmpline[0] = '\0'; 2229 reply(426, "Transfer aborted. Data connection closed."); 2230 reply(226, "Abort successful"); 2231 } 2232 if (strcmp(cp, "STAT\r\n") == 0) { 2233 tmpline[0] = '\0'; 2234 if (file_size != (off_t) -1) 2235 reply(213, "Status: %qd of %qd bytes transferred", 2236 byte_count, file_size); 2237 else 2238 reply(213, "Status: %qd bytes transferred", byte_count); 2239 } 2240} 2241 2242/* 2243 * Note: a response of 425 is not mentioned as a possible response to 2244 * the PASV command in RFC959. However, it has been blessed as 2245 * a legitimate response by Jon Postel in a telephone conversation 2246 * with Rick Adams on 25 Jan 89. 2247 */ 2248void 2249passive(void) 2250{ 2251 socklen_t len; 2252 int on; 2253 u_char *p, *a; 2254 2255 if (pw == NULL) { 2256 reply(530, "Please login with USER and PASS"); 2257 return; 2258 } 2259 if (pdata >= 0) 2260 close(pdata); 2261 /* 2262 * XXX 2263 * At this point, it would be nice to have an algorithm that 2264 * inserted a growing delay in an attack scenario. Such a thing 2265 * would look like continual passive sockets being opened, but 2266 * nothing serious being done with them. They're not used to 2267 * move data; the entire attempt is just to use tcp FIN_WAIT 2268 * resources. 2269 */ 2270 pdata = socket(AF_INET, SOCK_STREAM, 0); 2271 if (pdata < 0) { 2272 perror_reply(425, "Can't open passive connection"); 2273 return; 2274 } 2275 2276 on = IP_PORTRANGE_HIGH; 2277 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2278 &on, sizeof(on)) < 0) 2279 goto pasv_error; 2280 2281 pasv_addr = ctrl_addr; 2282 pasv_addr.su_sin.sin_port = 0; 2283 if (bind(pdata, (struct sockaddr *)&pasv_addr, 2284 pasv_addr.su_len) < 0) 2285 goto pasv_error; 2286 2287 len = sizeof(pasv_addr); 2288 if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) < 0) 2289 goto pasv_error; 2290 if (listen(pdata, 1) < 0) 2291 goto pasv_error; 2292 a = (u_char *)&pasv_addr.su_sin.sin_addr; 2293 p = (u_char *)&pasv_addr.su_sin.sin_port; 2294 2295 reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0], 2296 a[1], a[2], a[3], p[0], p[1]); 2297 return; 2298 2299pasv_error: 2300 perror_reply(425, "Can't open passive connection"); 2301 (void) close(pdata); 2302 pdata = -1; 2303 return; 2304} 2305 2306int 2307epsvproto2af(int proto) 2308{ 2309 2310 switch (proto) { 2311 case 1: return AF_INET; 2312#ifdef INET6 2313 case 2: return AF_INET6; 2314#endif 2315 default: return -1; 2316 } 2317} 2318 2319int 2320af2epsvproto(int af) 2321{ 2322 2323 switch (af) { 2324 case AF_INET: return 1; 2325#ifdef INET6 2326 case AF_INET6: return 2; 2327#endif 2328 default: return -1; 2329 } 2330} 2331 2332/* 2333 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2334 * 229 Entering Extended Passive Mode (|||port|) 2335 */ 2336void 2337long_passive(char *cmd, int pf) 2338{ 2339 socklen_t len; 2340 int on; 2341 u_char *p, *a; 2342 2343 if (!logged_in) { 2344 syslog(LOG_NOTICE, "long passive but not logged in"); 2345 reply(503, "Login with USER first."); 2346 return; 2347 } 2348 2349 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2350 /* 2351 * XXX 2352 * only EPRT/EPSV ready clients will understand this 2353 */ 2354 if (strcmp(cmd, "EPSV") != 0) 2355 reply(501, "Network protocol mismatch"); /*XXX*/ 2356 else 2357 epsv_protounsupp("Network protocol mismatch"); 2358 2359 return; 2360 } 2361 2362 if (pdata >= 0) 2363 close(pdata); 2364 /* 2365 * XXX 2366 * At this point, it would be nice to have an algorithm that 2367 * inserted a growing delay in an attack scenario. Such a thing 2368 * would look like continual passive sockets being opened, but 2369 * nothing serious being done with them. They not used to move 2370 * data; the entire attempt is just to use tcp FIN_WAIT 2371 * resources. 2372 */ 2373 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2374 if (pdata < 0) { 2375 perror_reply(425, "Can't open passive connection"); 2376 return; 2377 } 2378 2379 switch (ctrl_addr.su_family) { 2380 case AF_INET: 2381 on = IP_PORTRANGE_HIGH; 2382 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2383 &on, sizeof(on)) < 0) 2384 goto pasv_error; 2385 break; 2386 case AF_INET6: 2387 on = IPV6_PORTRANGE_HIGH; 2388 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2389 &on, sizeof(on)) < 0) 2390 goto pasv_error; 2391 break; 2392 } 2393 2394 pasv_addr = ctrl_addr; 2395 pasv_addr.su_port = 0; 2396 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2397 goto pasv_error; 2398 len = pasv_addr.su_len; 2399 if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) < 0) 2400 goto pasv_error; 2401 if (listen(pdata, 1) < 0) 2402 goto pasv_error; 2403 p = (u_char *)&pasv_addr.su_port; 2404 2405 if (strcmp(cmd, "LPSV") == 0) { 2406 switch (pasv_addr.su_family) { 2407 case AF_INET: 2408 a = (u_char *)&pasv_addr.su_sin.sin_addr; 2409 reply(228, 2410 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2411 4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]); 2412 return; 2413 case AF_INET6: 2414 a = (u_char *)&pasv_addr.su_sin6.sin6_addr; 2415 reply(228, 2416 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u," 2417 "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2418 6, 16, a[0], a[1], a[2], a[3], a[4], 2419 a[5], a[6], a[7], a[8], a[9], a[10], 2420 a[11], a[12], a[13], a[14], a[15], 2421 2, p[0], p[1]); 2422 return; 2423 } 2424 } else if (strcmp(cmd, "EPSV") == 0) { 2425 switch (pasv_addr.su_family) { 2426 case AF_INET: 2427 case AF_INET6: 2428 reply(229, "Entering Extended Passive Mode (|||%u|)", 2429 ntohs(pasv_addr.su_port)); 2430 return; 2431 } 2432 } else { 2433 /* more proper error code? */ 2434 } 2435 2436 pasv_error: 2437 perror_reply(425, "Can't open passive connection"); 2438 (void) close(pdata); 2439 pdata = -1; 2440 return; 2441} 2442 2443/* 2444 * EPRT |proto|addr|port| 2445 */ 2446int 2447extended_port(const char *arg) 2448{ 2449 char *tmp = NULL; 2450 char *result[3]; 2451 char *p, *q; 2452 char delim; 2453 struct addrinfo hints; 2454 struct addrinfo *res = NULL; 2455 int i; 2456 unsigned long proto; 2457 2458 if (epsvall) { 2459 reply(501, "EPRT disallowed after EPSV ALL"); 2460 return -1; 2461 } 2462 2463 usedefault = 0; 2464 if (pdata >= 0) { 2465 (void) close(pdata); 2466 pdata = -1; 2467 } 2468 2469 tmp = strdup(arg); 2470 if (!tmp) { 2471 fatal("not enough core."); 2472 /*NOTREACHED*/ 2473 } 2474 p = tmp; 2475 delim = p[0]; 2476 p++; 2477 memset(result, 0, sizeof(result)); 2478 for (i = 0; i < 3; i++) { 2479 q = strchr(p, delim); 2480 if (!q || *q != delim) 2481 goto parsefail; 2482 *q++ = '\0'; 2483 result[i] = p; 2484 p = q; 2485 } 2486 2487 /* some more sanity check */ 2488 p = NULL; 2489 (void)strtoul(result[2], &p, 10); 2490 if (!*result[2] || *p) 2491 goto protounsupp; 2492 p = NULL; 2493 proto = strtoul(result[0], &p, 10); 2494 if (!*result[0] || *p) 2495 goto protounsupp; 2496 2497 memset(&hints, 0, sizeof(hints)); 2498 hints.ai_family = epsvproto2af((int)proto); 2499 if (hints.ai_family < 0) 2500 goto protounsupp; 2501 hints.ai_socktype = SOCK_STREAM; 2502 hints.ai_flags = AI_NUMERICHOST; /*no DNS*/ 2503 if (getaddrinfo(result[1], result[2], &hints, &res)) 2504 goto parsefail; 2505 if (res->ai_next) 2506 goto parsefail; 2507 if (sizeof(data_dest) < res->ai_addrlen) 2508 goto parsefail; 2509 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2510 if (his_addr.su_family == AF_INET6 && 2511 data_dest.su_family == AF_INET6) { 2512 /* XXX more sanity checks! */ 2513 data_dest.su_sin6.sin6_scope_id = 2514 his_addr.su_sin6.sin6_scope_id; 2515 } 2516 if (pdata >= 0) { 2517 (void) close(pdata); 2518 pdata = -1; 2519 } 2520 reply(200, "EPRT command successful."); 2521 2522 if (tmp) 2523 free(tmp); 2524 if (res) 2525 freeaddrinfo(res); 2526 return 0; 2527 2528parsefail: 2529 reply(500, "Invalid argument, rejected."); 2530 usedefault = 1; 2531 if (tmp) 2532 free(tmp); 2533 if (res) 2534 freeaddrinfo(res); 2535 return -1; 2536 2537protounsupp: 2538 epsv_protounsupp("Protocol not supported"); 2539 usedefault = 1; 2540 if (tmp) 2541 free(tmp); 2542 if (res) 2543 freeaddrinfo(res); 2544 return -1; 2545} 2546 2547/* 2548 * 522 Protocol not supported (proto,...) 2549 * as we assume address family for control and data connections are the same, 2550 * we do not return the list of address families we support - instead, we 2551 * return the address family of the control connection. 2552 */ 2553void 2554epsv_protounsupp(const char *message) 2555{ 2556 int proto; 2557 2558 proto = af2epsvproto(ctrl_addr.su_family); 2559 if (proto < 0) 2560 reply(501, "%s", message); /*XXX*/ 2561 else 2562 reply(522, "%s, use (%d)", message, proto); 2563} 2564 2565/* 2566 * Generate unique name for file with basename "local". 2567 * The file named "local" is already known to exist. 2568 * Generates failure reply on error. 2569 */ 2570static int 2571guniquefd(char *local, char **nam) 2572{ 2573 static char new[MAXPATHLEN]; 2574 struct stat st; 2575 int count, len, fd; 2576 char *cp; 2577 2578 cp = strrchr(local, '/'); 2579 if (cp) 2580 *cp = '\0'; 2581 if (stat(cp ? local : ".", &st) < 0) { 2582 perror_reply(553, cp ? local : "."); 2583 return (-1); 2584 } 2585 if (cp) 2586 *cp = '/'; 2587 len = strlcpy(new, local, sizeof(new)); 2588 if (len+2+1 >= sizeof(new)-1) 2589 return (-1); 2590 cp = new + len; 2591 *cp++ = '.'; 2592 for (count = 1; count < 100; count++) { 2593 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 2594 fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666); 2595 if (fd == -1) 2596 continue; 2597 if (nam) 2598 *nam = new; 2599 return (fd); 2600 } 2601 reply(452, "Unique file name cannot be created."); 2602 return (-1); 2603} 2604 2605/* 2606 * Format and send reply containing system error number. 2607 */ 2608void 2609perror_reply(int code, char *string) 2610{ 2611 2612 reply(code, "%s: %s.", string, strerror(errno)); 2613} 2614 2615static char *onefile[] = { 2616 "", 2617 0 2618}; 2619 2620void 2621send_file_list(char *whichf) 2622{ 2623 struct stat st; 2624 DIR *dirp = NULL; 2625 struct dirent *dir; 2626 FILE *dout = NULL; 2627 char **dirlist; 2628 char *dirname; 2629 int simple = 0; 2630 volatile int freeglob = 0; 2631 glob_t gl; 2632 2633 if (strpbrk(whichf, "~{[*?") != NULL) { 2634 memset(&gl, 0, sizeof(gl)); 2635 freeglob = 1; 2636 if (glob(whichf, 2637 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, 2638 0, &gl)) { 2639 reply(550, "not found"); 2640 goto out; 2641 } else if (gl.gl_pathc == 0) { 2642 errno = ENOENT; 2643 perror_reply(550, whichf); 2644 goto out; 2645 } 2646 dirlist = gl.gl_pathv; 2647 } else { 2648 onefile[0] = whichf; 2649 dirlist = onefile; 2650 simple = 1; 2651 } 2652 2653 while ((dirname = *dirlist++)) { 2654 if (stat(dirname, &st) < 0) { 2655 /* 2656 * If user typed "ls -l", etc, and the client 2657 * used NLST, do what the user meant. 2658 */ 2659 if (dirname[0] == '-' && *dirlist == NULL && 2660 transflag == 0) { 2661 retrieve("/bin/ls %s", dirname); 2662 goto out; 2663 } 2664 perror_reply(550, whichf); 2665 if (dout != NULL) { 2666 (void) fclose(dout); 2667 transflag = 0; 2668 data = -1; 2669 pdata = -1; 2670 } 2671 goto out; 2672 } 2673 2674 if (S_ISREG(st.st_mode)) { 2675 if (dout == NULL) { 2676 dout = dataconn("file list", (off_t)-1, "w"); 2677 if (dout == NULL) 2678 goto out; 2679 transflag++; 2680 } 2681 fprintf(dout, "%s%s\n", dirname, 2682 type == TYPE_A ? "\r" : ""); 2683 byte_count += strlen(dirname) + 1; 2684 continue; 2685 } else if (!S_ISDIR(st.st_mode)) 2686 continue; 2687 2688 if ((dirp = opendir(dirname)) == NULL) 2689 continue; 2690 2691 while ((dir = readdir(dirp)) != NULL) { 2692 char nbuf[MAXPATHLEN]; 2693 2694 if (recvurg) { 2695 myoob(); 2696 recvurg = 0; 2697 transflag = 0; 2698 goto out; 2699 } 2700 2701 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2702 continue; 2703 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2704 dir->d_namlen == 2) 2705 continue; 2706 2707 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 2708 dir->d_name); 2709 2710 /* 2711 * We have to do a stat to insure it's 2712 * not a directory or special file. 2713 */ 2714 if (simple || (stat(nbuf, &st) == 0 && 2715 S_ISREG(st.st_mode))) { 2716 if (dout == NULL) { 2717 dout = dataconn("file list", (off_t)-1, 2718 "w"); 2719 if (dout == NULL) 2720 goto out; 2721 transflag++; 2722 } 2723 if (nbuf[0] == '.' && nbuf[1] == '/') 2724 fprintf(dout, "%s%s\n", &nbuf[2], 2725 type == TYPE_A ? "\r" : ""); 2726 else 2727 fprintf(dout, "%s%s\n", nbuf, 2728 type == TYPE_A ? "\r" : ""); 2729 byte_count += strlen(nbuf) + 1; 2730 } 2731 } 2732 (void) closedir(dirp); 2733 } 2734 2735 if (dout == NULL) 2736 reply(550, "No files found."); 2737 else if (ferror(dout) != 0) 2738 perror_reply(550, "Data connection"); 2739 else 2740 reply(226, "Transfer complete."); 2741 2742 transflag = 0; 2743 if (dout != NULL) 2744 (void) fclose(dout); 2745 else { 2746 if (pdata >= 0) 2747 close(pdata); 2748 } 2749 data = -1; 2750 pdata = -1; 2751out: 2752 if (freeglob) { 2753 freeglob = 0; 2754 globfree(&gl); 2755 } 2756} 2757 2758/*ARGSUSED*/ 2759static void 2760reapchild(int signo) 2761{ 2762 int save_errno = errno; 2763 int rval; 2764 2765 do { 2766 rval = waitpid(-1, NULL, WNOHANG); 2767 } while (rval > 0 || (rval == -1 && errno == EINTR)); 2768 errno = save_errno; 2769} 2770 2771void 2772logxfer(char *name, off_t size, time_t start) 2773{ 2774 char buf[400 + MAXHOSTNAMELEN*4 + MAXPATHLEN*4]; 2775 char dir[MAXPATHLEN], path[MAXPATHLEN], rpath[MAXPATHLEN]; 2776 char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; 2777 char *vpw; 2778 time_t now; 2779 int len; 2780 2781 if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) { 2782 time(&now); 2783 2784 vpw = malloc(strlen(guest ? guestpw : pw->pw_name) * 4 + 1); 2785 if (vpw == NULL) 2786 return; 2787 2788 snprintf(path, sizeof(path), "%s/%s", dir, name); 2789 if (realpath(path, rpath) == NULL) 2790 strlcpy(rpath, path, sizeof(rpath)); 2791 strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH); 2792 2793 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2794 strvis(vpw, guest? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2795 2796 len = snprintf(buf, sizeof(buf), 2797 "%.24s %d %s %qd %s %c %s %c %c %s ftp %d %s %s\n", 2798 ctime(&now), now - start + (now == start), 2799 vremotehost, (long long)size, vpath, 2800 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2801 'o', ((guest) ? 'a' : 'r'), 2802 vpw, 0 /* none yet */, 2803 ((guest) ? "*" : pw->pw_name), dhostname); 2804 free(vpw); 2805 2806 if (len >= sizeof(buf) || len == -1) { 2807 if ((len = strlen(buf)) == 0) 2808 return; /* should not happen */ 2809 buf[len - 1] = '\n'; 2810 } 2811 write(statfd, buf, len); 2812 } 2813} 2814 2815void 2816set_slave_signals(void) 2817{ 2818 struct sigaction sa; 2819 2820 sigemptyset(&sa.sa_mask); 2821 sa.sa_flags = SA_RESTART; 2822 2823 sa.sa_handler = SIG_DFL; 2824 (void) sigaction(SIGCHLD, &sa, NULL); 2825 2826 sa.sa_handler = sigurg; 2827 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 2828 (void) sigaction(SIGURG, &sa, NULL); 2829 2830 sigfillset(&sa.sa_mask); /* block all signals in handler */ 2831 sa.sa_flags = SA_RESTART; 2832 sa.sa_handler = sigquit; 2833 (void) sigaction(SIGHUP, &sa, NULL); 2834 (void) sigaction(SIGINT, &sa, NULL); 2835 (void) sigaction(SIGQUIT, &sa, NULL); 2836 (void) sigaction(SIGTERM, &sa, NULL); 2837 2838 sa.sa_handler = lostconn; 2839 (void) sigaction(SIGPIPE, &sa, NULL); 2840 2841 sa.sa_handler = toolong; 2842 (void) sigaction(SIGALRM, &sa, NULL); 2843 2844#ifdef F_SETOWN 2845 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 2846 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 2847#endif 2848} 2849 2850#if defined(TCPWRAPPERS) 2851static int 2852check_host(struct sockaddr *sa) 2853{ 2854 struct sockaddr_in *sin; 2855 struct hostent *hp; 2856 char *addr; 2857 2858 if (sa->sa_family != AF_INET) 2859 return 1; /*XXX*/ 2860 2861 sin = (struct sockaddr_in *)sa; 2862 hp = gethostbyaddr((char *)&sin->sin_addr, 2863 sizeof(struct in_addr), AF_INET); 2864 addr = inet_ntoa(sin->sin_addr); 2865 if (hp) { 2866 if (!hosts_ctl("ftpd", hp->h_name, addr, STRING_UNKNOWN)) { 2867 syslog(LOG_NOTICE, "tcpwrappers rejected: %s [%s]", 2868 hp->h_name, addr); 2869 return (0); 2870 } 2871 } else { 2872 if (!hosts_ctl("ftpd", STRING_UNKNOWN, addr, STRING_UNKNOWN)) { 2873 syslog(LOG_NOTICE, "tcpwrappers rejected: [%s]", addr); 2874 return (0); 2875 } 2876 } 2877 return (1); 2878} 2879#endif /* TCPWRAPPERS */ 2880 2881/* 2882 * Allocate space and return a copy of the specified dir. 2883 * If 'dir' begins with a tilde (~), expand it. 2884 */ 2885char * 2886copy_dir(char *dir, struct passwd *pw) 2887{ 2888 char *cp; 2889 char *newdir; 2890 char *user = NULL; 2891 2892 /* Nothing to expand */ 2893 if (dir[0] != '~') 2894 return (strdup(dir)); 2895 2896 /* "dir" is of form ~user/some/dir, lookup user. */ 2897 if (dir[1] != '/' && dir[1] != '\0') { 2898 if ((cp = strchr(dir + 1, '/')) == NULL) 2899 cp = dir + strlen(dir); 2900 if ((user = malloc((size_t)(cp - dir))) == NULL) 2901 return (NULL); 2902 strlcpy(user, dir + 1, (size_t)(cp - dir)); 2903 2904 /* Only do lookup if it is a different user. */ 2905 if (strcmp(user, pw->pw_name) != 0) { 2906 if ((pw = getpwnam(user)) == NULL) { 2907 /* No such user, interpret literally */ 2908 free(user); 2909 return(strdup(dir)); 2910 } 2911 } 2912 free(user); 2913 } 2914 2915 /* 2916 * If there is no directory separator (/) then it is just pw_dir. 2917 * Otherwise, replace ~foo with pw_dir. 2918 */ 2919 if ((cp = strchr(dir + 1, '/')) == NULL) { 2920 newdir = strdup(pw->pw_dir); 2921 } else { 2922 if (asprintf(&newdir, "%s%s", pw->pw_dir, cp) == -1) 2923 return (NULL); 2924 } 2925 2926 return(newdir); 2927} 2928