1/* $NetBSD: ftpd.c,v 1.208 2023/09/30 18:06:24 shm Exp $ */ 2 3/* 4 * Copyright (c) 1997-2023 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32/* 33 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 */ 60 61/* 62 * Copyright (C) 1997 and 1998 WIDE Project. 63 * All rights reserved. 64 * 65 * Redistribution and use in source and binary forms, with or without 66 * modification, are permitted provided that the following conditions 67 * are met: 68 * 1. Redistributions of source code must retain the above copyright 69 * notice, this list of conditions and the following disclaimer. 70 * 2. Redistributions in binary form must reproduce the above copyright 71 * notice, this list of conditions and the following disclaimer in the 72 * documentation and/or other materials provided with the distribution. 73 * 3. Neither the name of the project nor the names of its contributors 74 * may be used to endorse or promote products derived from this software 75 * without specific prior written permission. 76 * 77 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 78 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 79 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 80 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 81 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 82 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 83 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 84 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 85 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 86 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 87 * SUCH DAMAGE. 88 */ 89 90#include <sys/cdefs.h> 91#ifndef lint 92__COPYRIGHT("@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\ 93 The Regents of the University of California. All rights reserved."); 94#endif /* not lint */ 95 96#ifndef lint 97#if 0 98static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 99#else 100__RCSID("$NetBSD: ftpd.c,v 1.208 2023/09/30 18:06:24 shm Exp $"); 101#endif 102#endif /* not lint */ 103 104/* 105 * FTP server. 106 */ 107#include <sys/param.h> 108#include <sys/stat.h> 109#include <sys/ioctl.h> 110#include <sys/socket.h> 111#include <sys/wait.h> 112#include <sys/mman.h> 113#include <sys/resource.h> 114 115#include <netinet/in.h> 116#include <netinet/in_systm.h> 117#include <netinet/ip.h> 118 119#define FTP_NAMES 120#include <arpa/ftp.h> 121#include <arpa/inet.h> 122#include <arpa/telnet.h> 123 124#include <ctype.h> 125#include <dirent.h> 126#include <err.h> 127#include <errno.h> 128#include <fcntl.h> 129#include <fnmatch.h> 130#include <glob.h> 131#include <grp.h> 132#include <limits.h> 133#include <netdb.h> 134#include <pwd.h> 135#include <poll.h> 136#include <signal.h> 137#include <stdarg.h> 138#include <stdio.h> 139#include <stdlib.h> 140#include <string.h> 141#include <syslog.h> 142#include <time.h> 143#include <tzfile.h> 144#include <unistd.h> 145#include <util.h> 146#ifdef SUPPORT_UTMP 147#include <utmp.h> 148#endif 149#ifdef SUPPORT_UTMPX 150#include <utmpx.h> 151#endif 152#ifdef SKEY 153#include <skey.h> 154#endif 155#ifdef KERBEROS5 156#include <com_err.h> 157#include <krb5/krb5.h> 158#endif 159 160#ifdef LOGIN_CAP 161#include <login_cap.h> 162#endif 163 164#ifdef USE_PAM 165#include <security/pam_appl.h> 166#endif 167 168#include "pfilter.h" 169 170#define GLOBAL 171#include "extern.h" 172#include "pathnames.h" 173#include "version.h" 174 175static sig_atomic_t transflag; 176static sig_atomic_t urgflag; 177 178int data; 179int Dflag; 180int fflag; 181int sflag; 182int stru; /* avoid C keyword */ 183int mode; 184int dataport; /* use specific data port */ 185int dopidfile; /* maintain pid file */ 186int doutmp; /* update utmp file */ 187int dowtmp; /* update wtmp file */ 188int doxferlog; /* syslog/write wu-ftpd style xferlog entries */ 189int xferlogfd; /* fd to write wu-ftpd xferlog entries to */ 190int getnameopts; /* flags for use with getname() */ 191int dropprivs; /* if privileges should or have been dropped */ 192int mapped; /* IPv4 connection on AF_INET6 socket */ 193off_t file_size; 194off_t byte_count; 195static char ttyline[20]; 196 197#ifdef USE_PAM 198static int auth_pam(void); 199pam_handle_t *pamh = NULL; 200#endif 201 202#ifdef SUPPORT_UTMP 203static struct utmp utmp; /* for utmp */ 204#endif 205#ifdef SUPPORT_UTMPX 206static struct utmpx utmpx; /* for utmpx */ 207#endif 208 209static const char *anondir = NULL; 210static const char *confdir = _DEFAULT_CONFDIR; 211 212static char *curname; /* current USER name */ 213static size_t curname_len; /* length of curname (include NUL) */ 214 215#if defined(KERBEROS) || defined(KERBEROS5) 216int has_ccache = 0; 217int notickets = 1; 218char *krbtkfile_env = NULL; 219char *tty = ttyline; 220int login_krb5_forwardable_tgt = 0; 221#endif 222 223int epsvall = 0; 224 225/* 226 * Timeout intervals for retrying connections 227 * to hosts that don't accept PORT cmds. This 228 * is a kludge, but given the problems with TCP... 229 */ 230#define SWAITMAX 90 /* wait at most 90 seconds */ 231#define SWAITINT 5 /* interval between retries */ 232 233int swaitmax = SWAITMAX; 234int swaitint = SWAITINT; 235 236enum send_status { 237 SS_SUCCESS, 238 SS_ABORTED, /* transfer aborted */ 239 SS_NO_TRANSFER, /* no transfer made yet */ 240 SS_FILE_ERROR, /* file read error */ 241 SS_DATA_ERROR /* data send error */ 242}; 243 244static int bind_pasv_addr(void); 245static int checkuser(const char *, const char *, int, int, char **); 246static int checkaccess(const char *); 247static int checkpassword(const struct passwd *, const char *); 248static void do_pass(int, int, const char *); 249static void end_login(void); 250static FILE *getdatasock(const char *); 251static char *gunique(const char *); 252static void login_utmp(const char *, const char *, const char *, 253 struct sockinet *); 254static void logremotehost(struct sockinet *); 255__dead static void lostconn(int); 256__dead static void toolong(int); 257__dead static void sigquit(int); 258static void sigurg(int); 259static int handleoobcmd(void); 260static int receive_data(FILE *, FILE *); 261static int send_data(FILE *, FILE *, const struct stat *, int); 262static struct passwd *sgetpwnam(const char *); 263static int write_data(int, char *, size_t, off_t *, struct timeval *, 264 int); 265static enum send_status 266 send_data_with_read(int, int, const struct stat *, int); 267static enum send_status 268 send_data_with_mmap(int, int, const struct stat *, int); 269static void logrusage(const struct rusage *, const struct rusage *); 270static void logout_utmp(void); 271 272int main(int, char *[]); 273 274#if defined(KERBEROS) 275int klogin(struct passwd *, char *, char *, char *); 276void kdestroy(void); 277#endif 278#if defined(KERBEROS5) 279int k5login(struct passwd *, char *, char *, char *); 280void k5destroy(void); 281#endif 282 283int 284main(int argc, char *argv[]) 285{ 286 int ch, on = 1, tos, keepalive; 287 socklen_t addrlen; 288#ifdef KERBEROS5 289 krb5_error_code kerror; 290#endif 291 char *p; 292 const char *xferlogname = NULL; 293 long l; 294 struct sigaction sa; 295 sa_family_t af = AF_UNSPEC; 296 297 connections = 1; 298 ftpd_debug = 0; 299 logging = 0; 300 pdata = -1; 301 Dflag = 0; 302 fflag = 0; 303 sflag = 0; 304 dataport = 0; 305 dopidfile = 1; /* default: DO use a pid file to count users */ 306 doutmp = 0; /* default: Do NOT log to utmp */ 307 dowtmp = 1; /* default: DO log to wtmp */ 308 doxferlog = 0; /* default: Do NOT syslog xferlog */ 309 xferlogfd = -1; /* default: Do NOT write xferlog file */ 310 getnameopts = 0; /* default: xlate addrs to name */ 311 dropprivs = 0; 312 mapped = 0; 313 usedefault = 1; 314 emailaddr = NULL; 315 hostname[0] = '\0'; 316 homedir[0] = '\0'; 317 gidcount = 0; 318 is_oob = 0; 319 version = FTPD_VERSION; 320 321 /* 322 * LOG_NDELAY sets up the logging connection immediately, 323 * necessary for anonymous ftp's that chroot and can't do it later. 324 */ 325 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 326 327 while ((ch = getopt(argc, argv, 328 "46a:c:C:Dde:fh:HlL:nP:qQrst:T:uUvV:wWX")) != -1) { 329 switch (ch) { 330 case '4': 331 af = AF_INET; 332 break; 333 334 case '6': 335 af = AF_INET6; 336 break; 337 338 case 'a': 339 anondir = optarg; 340 break; 341 342 case 'c': 343 confdir = optarg; 344 break; 345 346 case 'C': 347 if ((p = strchr(optarg, '@')) != NULL) { 348 *p++ = '\0'; 349 strlcpy(remotehost, p, MAXHOSTNAMELEN + 1); 350 if (inet_pton(AF_INET, p, 351 &his_addr.su_addr) == 1) { 352 his_addr.su_family = AF_INET; 353 his_addr.su_len = 354 sizeof(his_addr.si_su.su_sin); 355#ifdef INET6 356 } else if (inet_pton(AF_INET6, p, 357 &his_addr.su_6addr) == 1) { 358 his_addr.su_family = AF_INET6; 359 his_addr.su_len = 360 sizeof(his_addr.si_su.su_sin6); 361#endif 362 } else 363 his_addr.su_family = AF_UNSPEC; 364 } 365 pw = sgetpwnam(optarg); 366 exit(checkaccess(optarg) ? 0 : 1); 367 /* NOTREACHED */ 368 369 case 'D': 370 Dflag = 1; 371 break; 372 373 case 'd': 374 case 'v': /* deprecated */ 375 ftpd_debug = 1; 376 break; 377 378 case 'e': 379 emailaddr = optarg; 380 break; 381 382 case 'f': 383 fflag = 1; 384 break; 385 386 case 'h': 387 strlcpy(hostname, optarg, sizeof(hostname)); 388 break; 389 390 case 'H': 391 if (gethostname(hostname, sizeof(hostname)) == -1) 392 hostname[0] = '\0'; 393 hostname[sizeof(hostname) - 1] = '\0'; 394 break; 395 396 case 'l': 397 logging++; /* > 1 == extra logging */ 398 break; 399 400 case 'L': 401 xferlogname = optarg; 402 break; 403 404 case 'n': 405 getnameopts = NI_NUMERICHOST; 406 break; 407 408 case 'P': 409 errno = 0; 410 p = NULL; 411 l = strtol(optarg, &p, 10); 412 if (errno || *optarg == '\0' || *p != '\0' || 413 l < IPPORT_RESERVED || 414 l > IPPORT_ANONMAX) { 415 syslog(LOG_WARNING, "Invalid dataport %s", 416 optarg); 417 dataport = 0; 418 } 419 dataport = (int)l; 420 break; 421 422 case 'q': 423 dopidfile = 1; 424 break; 425 426 case 'Q': 427 dopidfile = 0; 428 break; 429 430 case 'r': 431 dropprivs = 1; 432 break; 433 434 case 's': 435 sflag = 1; 436 break; 437 438 case 't': 439 case 'T': 440 syslog(LOG_WARNING, 441 "-%c has been deprecated in favour of ftpd.conf", 442 ch); 443 break; 444 445 case 'u': 446 doutmp = 1; 447 break; 448 449 case 'U': 450 doutmp = 0; 451 break; 452 453 case 'V': 454 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 455 version = NULL; 456 else 457 version = ftpd_strdup(optarg); 458 break; 459 460 case 'w': 461 dowtmp = 1; 462 break; 463 464 case 'W': 465 dowtmp = 0; 466 break; 467 468 case 'X': 469 doxferlog |= 1; 470 break; 471 472 default: 473 if (optopt == 'a' || optopt == 'C') 474 exit(1); 475 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 476 break; 477 } 478 } 479 if (EMPTYSTR(confdir)) 480 confdir = _DEFAULT_CONFDIR; 481 482 pfilter_open(); 483 484 if (dowtmp) { 485#ifdef SUPPORT_UTMPX 486 ftpd_initwtmpx(); 487#endif 488#ifdef SUPPORT_UTMP 489 ftpd_initwtmp(); 490#endif 491 } 492 errno = 0; 493 l = sysconf(_SC_LOGIN_NAME_MAX); 494 if (l == -1 && errno != 0) { 495 syslog(LOG_ERR, "sysconf _SC_LOGIN_NAME_MAX: %m"); 496 exit(1); 497 } else if (l <= 0) { 498 syslog(LOG_WARNING, "using conservative LOGIN_NAME_MAX value"); 499 curname_len = _POSIX_LOGIN_NAME_MAX; 500 } else 501 curname_len = (size_t)l; 502 curname = malloc(curname_len); 503 if (curname == NULL) { 504 syslog(LOG_ERR, "malloc: %m"); 505 exit(1); 506 } 507 curname[0] = '\0'; 508 509 if (Dflag) { 510 int error, fd, i, n, *socks; 511 struct pollfd *fds; 512 struct addrinfo hints, *res, *res0; 513 514 if (!fflag && daemon(1, 0) == -1) { 515 syslog(LOG_ERR, "failed to daemonize: %m"); 516 exit(1); 517 } 518 (void)memset(&sa, 0, sizeof(sa)); 519 sa.sa_handler = SIG_IGN; 520 sa.sa_flags = SA_NOCLDWAIT; 521 sigemptyset(&sa.sa_mask); 522 (void)sigaction(SIGCHLD, &sa, NULL); 523 524 (void)memset(&hints, 0, sizeof(hints)); 525 hints.ai_flags = AI_PASSIVE; 526 hints.ai_family = af; 527 hints.ai_socktype = SOCK_STREAM; 528 error = getaddrinfo(NULL, "ftp", &hints, &res0); 529 if (error) { 530 syslog(LOG_ERR, "getaddrinfo: %s", gai_strerror(error)); 531 exit(1); 532 } 533 534 for (n = 0, res = res0; res != NULL; res = res->ai_next) 535 n++; 536 if (n == 0) { 537 syslog(LOG_ERR, "no addresses available"); 538 exit(1); 539 } 540 socks = malloc(n * sizeof(int)); 541 fds = malloc(n * sizeof(struct pollfd)); 542 if (socks == NULL || fds == NULL) { 543 syslog(LOG_ERR, "malloc: %m"); 544 exit(1); 545 } 546 547 for (n = 0, res = res0; res != NULL; res = res->ai_next) { 548 socks[n] = socket(res->ai_family, res->ai_socktype, 549 res->ai_protocol); 550 if (socks[n] == -1) 551 continue; 552 (void)setsockopt(socks[n], SOL_SOCKET, SO_REUSEADDR, 553 &on, sizeof(on)); 554 if (bind(socks[n], res->ai_addr, res->ai_addrlen) 555 == -1) { 556 (void)close(socks[n]); 557 continue; 558 } 559 if (listen(socks[n], 12) == -1) { 560 (void)close(socks[n]); 561 continue; 562 } 563 564 fds[n].fd = socks[n]; 565 fds[n].events = POLLIN; 566 n++; 567 } 568 if (n == 0) { 569 syslog(LOG_ERR, "%m"); 570 exit(1); 571 } 572 freeaddrinfo(res0); 573 574 if (pidfile(NULL) == -1) 575 syslog(LOG_ERR, "failed to write a pid file: %m"); 576 577 for (;;) { 578 if (poll(fds, n, INFTIM) == -1) { 579 if (errno == EINTR) 580 continue; 581 syslog(LOG_ERR, "poll: %m"); 582 exit(1); 583 } 584 for (i = 0; i < n; i++) { 585 if (fds[i].revents & POLLIN) { 586 fd = accept(fds[i].fd, NULL, NULL); 587 if (fd == -1) { 588 syslog(LOG_ERR, "accept: %m"); 589 continue; 590 } 591 switch (fork()) { 592 case -1: 593 syslog(LOG_ERR, "fork: %m"); 594 break; 595 case 0: 596 goto child; 597 /* NOTREACHED */ 598 } 599 (void)close(fd); 600 } 601 } 602 } 603 child: 604 (void)dup2(fd, STDIN_FILENO); 605 (void)dup2(fd, STDOUT_FILENO); 606 (void)dup2(fd, STDERR_FILENO); 607 for (i = 0; i < n; i++) 608 (void)close(socks[i]); 609 } 610 611 memset((char *)&his_addr, 0, sizeof(his_addr)); 612 addrlen = sizeof(his_addr.si_su); 613 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 614 syslog((errno == ENOTCONN) ? LOG_NOTICE : LOG_ERR, 615 "getpeername (%s): %m",argv[0]); 616 exit(1); 617 } 618 his_addr.su_len = addrlen; 619 memset((char *)&ctrl_addr, 0, sizeof(ctrl_addr)); 620 addrlen = sizeof(ctrl_addr.si_su); 621 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 622 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 623 exit(1); 624 } 625 ctrl_addr.su_len = addrlen; 626#ifdef INET6 627 if (his_addr.su_family == AF_INET6 628 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 629#if 1 630 /* 631 * IPv4 control connection arrived to AF_INET6 socket. 632 * I hate to do this, but this is the easiest solution. 633 * 634 * The assumption is untrue on SIIT environment. 635 */ 636 struct sockinet tmp_addr; 637 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 638 639 tmp_addr = his_addr; 640 memset(&his_addr, 0, sizeof(his_addr)); 641 his_addr.su_family = AF_INET; 642 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 643 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 644 sizeof(his_addr.su_addr)); 645 his_addr.su_port = tmp_addr.su_port; 646 647 tmp_addr = ctrl_addr; 648 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 649 ctrl_addr.su_family = AF_INET; 650 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 651 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 652 sizeof(ctrl_addr.su_addr)); 653 ctrl_addr.su_port = tmp_addr.su_port; 654#else 655 while (fgets(line, sizeof(line), fd) != NULL) { 656 if ((cp = strchr(line, '\n')) != NULL) 657 *cp = '\0'; 658 reply(-530, "%s", line); 659 } 660 (void) fflush(stdout); 661 (void) fclose(fd); 662 reply(530, 663 "Connection from IPv4 mapped address is not supported."); 664 exit(0); 665#endif 666 667 mapped = 1; 668 } else 669#endif /* INET6 */ 670 mapped = 0; 671#ifdef IP_TOS 672 if (!mapped && his_addr.su_family == AF_INET) { 673 tos = IPTOS_LOWDELAY; 674 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 675 sizeof(int)) < 0) 676 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 677 } 678#endif 679 /* if the hostname hasn't been given, attempt to determine it */ 680 if (hostname[0] == '\0') { 681 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 682 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 683 getnameopts) != 0) 684 (void)gethostname(hostname, sizeof(hostname)); 685 hostname[sizeof(hostname) - 1] = '\0'; 686 } 687 688 /* set this here so klogin can use it... */ 689 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 690 691 (void) freopen(_PATH_DEVNULL, "w", stderr); 692 693 memset(&sa, 0, sizeof(sa)); 694 sa.sa_handler = SIG_DFL; 695 sa.sa_flags = SA_RESTART; 696 sigemptyset(&sa.sa_mask); 697 (void) sigaction(SIGCHLD, &sa, NULL); 698 699 sa.sa_handler = sigquit; 700 sa.sa_flags = SA_RESTART; 701 sigfillset(&sa.sa_mask); /* block all sigs in these handlers */ 702 (void) sigaction(SIGHUP, &sa, NULL); 703 (void) sigaction(SIGINT, &sa, NULL); 704 (void) sigaction(SIGQUIT, &sa, NULL); 705 (void) sigaction(SIGTERM, &sa, NULL); 706 sa.sa_handler = lostconn; 707 (void) sigaction(SIGPIPE, &sa, NULL); 708 sa.sa_handler = toolong; 709 (void) sigaction(SIGALRM, &sa, NULL); 710 sa.sa_handler = sigurg; 711 (void) sigaction(SIGURG, &sa, NULL); 712 713 /* Try to handle urgent data inline */ 714#ifdef SO_OOBINLINE 715 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 716 syslog(LOG_WARNING, "setsockopt: %m"); 717#endif 718 /* Set keepalives on the socket to detect dropped connections. */ 719#ifdef SO_KEEPALIVE 720 keepalive = 1; 721 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 722 sizeof(int)) < 0) 723 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 724#endif 725 726#ifdef F_SETOWN 727 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 728 syslog(LOG_WARNING, "fcntl F_SETOWN: %m"); 729#endif 730 logremotehost(&his_addr); 731 /* 732 * Set up default state 733 */ 734 data = -1; 735 type = TYPE_A; 736 form = FORM_N; 737 stru = STRU_F; 738 mode = MODE_S; 739 tmpline[0] = '\0'; 740 hasyyerrored = 0; 741 742#ifdef KERBEROS5 743 kerror = krb5_init_context(&kcontext); 744 if (kerror) { 745 syslog(LOG_ERR, "%s when initializing Kerberos context", 746 error_message(kerror)); 747 exit(0); 748 } 749#endif /* KERBEROS5 */ 750 751 init_curclass(); 752 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 753 curclass.type = CLASS_REAL; 754 755 /* If logins are disabled, print out the message. */ 756 if (display_file(_PATH_NOLOGIN, 530)) { 757 reply(530, "System not available."); 758 exit(0); 759 } 760 (void)display_file(conffilename(_NAME_FTPWELCOME), 220); 761 /* reply(220,) must follow */ 762 if (EMPTYSTR(version)) 763 reply(220, "%s FTP server ready.", hostname); 764 else 765 reply(220, "%s FTP server (%s) ready.", hostname, version); 766 767 if (xferlogname != NULL) { 768 xferlogfd = open(xferlogname, O_WRONLY | O_APPEND | O_CREAT, 769 0660); 770 if (xferlogfd == -1) 771 syslog(LOG_WARNING, "open xferlog `%s': %m", 772 xferlogname); 773 else 774 doxferlog |= 2; 775 } 776 777 ftp_loop(); 778 /* NOTREACHED */ 779} 780 781static void 782lostconn(int signo __unused) 783{ 784 785 if (ftpd_debug) 786 syslog(LOG_DEBUG, "lost connection"); 787 dologout(1); 788} 789 790static void 791toolong(int signo __unused) 792{ 793 794 /* XXXSIGRACE */ 795 reply(421, 796 "Timeout (" LLF " seconds): closing control connection.", 797 (LLT)curclass.timeout); 798 if (logging) 799 syslog(LOG_INFO, "User %s timed out after " LLF " seconds", 800 (pw ? pw->pw_name : "unknown"), (LLT)curclass.timeout); 801 dologout(1); 802} 803 804static void 805sigquit(int signo) 806{ 807 808 if (ftpd_debug) 809 syslog(LOG_DEBUG, "got signal %d", signo); 810 dologout(1); 811} 812 813static void 814sigurg(int signo __unused) 815{ 816 817 urgflag = 1; 818} 819 820 821/* 822 * Save the result of a getpwnam. Used for USER command, since 823 * the data returned must not be clobbered by any other command 824 * (e.g., globbing). 825 */ 826static struct passwd * 827sgetpwnam(const char *name) 828{ 829 static struct passwd save; 830 struct passwd *p; 831 832 if ((p = getpwnam(name)) == NULL) 833 return (p); 834 if (save.pw_name) { 835 free((char *)save.pw_name); 836 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 837 free((char *)save.pw_passwd); 838 free((char *)save.pw_gecos); 839 free((char *)save.pw_dir); 840 free((char *)save.pw_shell); 841 } 842 save = *p; 843 save.pw_name = ftpd_strdup(p->pw_name); 844 save.pw_passwd = ftpd_strdup(p->pw_passwd); 845 save.pw_gecos = ftpd_strdup(p->pw_gecos); 846 save.pw_dir = ftpd_strdup(p->pw_dir); 847 save.pw_shell = ftpd_strdup(p->pw_shell); 848 return (&save); 849} 850 851static int login_attempts; /* number of failed login attempts */ 852static int askpasswd; /* had USER command, ask for PASSwd */ 853static int permitted; /* USER permitted */ 854 855/* 856 * USER command. 857 * Sets global passwd pointer pw if named account exists and is acceptable; 858 * sets askpasswd if a PASS command is expected. If logged in previously, 859 * need to reset state. If name is "ftp" or "anonymous", the name is not in 860 * _NAME_FTPUSERS, and ftp account exists, set guest and pw, then just return. 861 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 862 * requesting login privileges. Disallow anyone who does not have a standard 863 * shell as returned by getusershell(). Disallow anyone mentioned in the file 864 * _NAME_FTPUSERS to allow people such as root and uucp to be avoided. 865 */ 866void 867user(const char *name) 868{ 869 char *class; 870#ifdef LOGIN_CAP 871 login_cap_t *lc = NULL; 872#endif 873#ifdef USE_PAM 874 int e; 875#endif 876 877 class = NULL; 878 if (logged_in) { 879 switch (curclass.type) { 880 case CLASS_GUEST: 881 reply(530, "Can't change user from guest login."); 882 return; 883 case CLASS_CHROOT: 884 reply(530, "Can't change user from chroot user."); 885 return; 886 case CLASS_REAL: 887 if (dropprivs) { 888 reply(530, "Can't change user."); 889 return; 890 } 891 end_login(); 892 break; 893 default: 894 abort(); 895 } 896 } 897 898#if defined(KERBEROS) 899 kdestroy(); 900#endif 901#if defined(KERBEROS5) 902 k5destroy(); 903#endif 904 905 curclass.type = CLASS_REAL; 906 askpasswd = 0; 907 permitted = 0; 908 909 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 910 /* need `pw' setup for checkaccess() and checkuser () */ 911 if ((pw = sgetpwnam("ftp")) == NULL) 912 reply(530, "User %s unknown.", name); 913 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 914 reply(530, "User %s access denied.", name); 915 else { 916 curclass.type = CLASS_GUEST; 917 askpasswd = 1; 918 reply(331, 919 "Guest login ok, type your name as password."); 920 } 921 if (!askpasswd) { 922 if (logging) 923 syslog(LOG_NOTICE, 924 "ANONYMOUS FTP LOGIN REFUSED FROM %s", 925 remoteloghost); 926 end_login(); 927 goto cleanup_user; 928 } 929 name = "ftp"; 930 } else 931 pw = sgetpwnam(name); 932 933 strlcpy(curname, name, curname_len); 934 935 /* check user in /etc/ftpusers, and setup class */ 936 permitted = checkuser(_NAME_FTPUSERS, curname, 1, 0, &class); 937 938 /* check user in /etc/ftpchroot */ 939#ifdef LOGIN_CAP 940 lc = login_getpwclass(pw); 941#endif 942 if (checkuser(_NAME_FTPCHROOT, curname, 0, 0, NULL) 943#ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 944 || login_getcapbool(lc, "ftp-chroot", 0) 945#endif 946 ) { 947 if (curclass.type == CLASS_GUEST) { 948 syslog(LOG_NOTICE, 949 "Can't change guest user to chroot class; remove entry in %s", 950 _NAME_FTPCHROOT); 951 exit(1); 952 } 953 curclass.type = CLASS_CHROOT; 954 } 955 956 /* determine default class */ 957 if (class == NULL) { 958 switch (curclass.type) { 959 case CLASS_GUEST: 960 class = ftpd_strdup("guest"); 961 break; 962 case CLASS_CHROOT: 963 class = ftpd_strdup("chroot"); 964 break; 965 case CLASS_REAL: 966 class = ftpd_strdup("real"); 967 break; 968 default: 969 syslog(LOG_ERR, "unknown curclass.type %d; aborting", 970 curclass.type); 971 abort(); 972 } 973 } 974 /* parse ftpd.conf, setting up various parameters */ 975 parse_conf(class); 976 /* if not guest user, check for valid shell */ 977 if (pw == NULL) 978 permitted = 0; 979 else { 980 const char *cp, *shell; 981 982 if ((shell = pw->pw_shell) == NULL || *shell == 0) 983 shell = _PATH_BSHELL; 984 while ((cp = getusershell()) != NULL) 985 if (strcmp(cp, shell) == 0) 986 break; 987 endusershell(); 988 if (cp == NULL && curclass.type != CLASS_GUEST) 989 permitted = 0; 990 } 991 992 /* deny quickly (after USER not PASS) if requested */ 993 if (CURCLASS_FLAGS_ISSET(denyquick) && !permitted) { 994 reply(530, "User %s may not use FTP.", curname); 995 if (logging) 996 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 997 remoteloghost, curname); 998 end_login(); 999 goto cleanup_user; 1000 } 1001 1002 /* if haven't asked yet (i.e, not anon), ask now */ 1003 if (!askpasswd) { 1004 askpasswd = 1; 1005#ifdef USE_PAM 1006 e = auth_pam(); /* this does reply(331, ...) */ 1007 do_pass(1, e, ""); 1008 goto cleanup_user; 1009#else /* !USE_PAM */ 1010#ifdef SKEY 1011 if (skey_haskey(curname) == 0) { 1012 const char *myskey; 1013 1014 myskey = skey_keyinfo(curname); 1015 reply(331, "Password [ %s ] required for %s.", 1016 myskey ? myskey : "error getting challenge", 1017 curname); 1018 } else 1019#endif 1020 reply(331, "Password required for %s.", curname); 1021#endif /* !USE_PAM */ 1022 } 1023 1024 cleanup_user: 1025#ifdef LOGIN_CAP 1026 login_close(lc); 1027#endif 1028 /* 1029 * Delay before reading passwd after first failed 1030 * attempt to slow down passwd-guessing programs. 1031 */ 1032 if (login_attempts) 1033 sleep((unsigned) login_attempts); 1034 1035 if (class) 1036 free(class); 1037} 1038 1039/* 1040 * Determine whether something is to happen (allow access, chroot) 1041 * for a user. Each line is a shell-style glob followed by 1042 * `yes' or `no'. 1043 * 1044 * For backward compatibility, `allow' and `deny' are synonymns 1045 * for `yes' and `no', respectively. 1046 * 1047 * Each glob is matched against the username in turn, and the first 1048 * match found is used. If no match is found, the result is the 1049 * argument `def'. If a match is found but without and explicit 1050 * `yes'/`no', the result is the opposite of def. 1051 * 1052 * If the file doesn't exist at all, the result is the argument 1053 * `nofile' 1054 * 1055 * Any line starting with `#' is considered a comment and ignored. 1056 * 1057 * Returns 0 if the user is denied, or 1 if they are allowed. 1058 * 1059 * NOTE: needs struct passwd *pw setup before use. 1060 */ 1061static int 1062checkuser(const char *fname, const char *name, int def, int nofile, 1063 char **retclass) 1064{ 1065 FILE *fd; 1066 int retval; 1067 char *word, *perm, *class, *buf, *p; 1068 size_t len, line; 1069 1070 retval = def; 1071 if (retclass != NULL) 1072 *retclass = NULL; 1073 if ((fd = fopen(conffilename(fname), "r")) == NULL) 1074 return nofile; 1075 1076 line = 0; 1077 for (; 1078 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 1079 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 1080 free(buf), buf = NULL) { 1081 word = perm = class = NULL; 1082 p = buf; 1083 if (len < 1) 1084 continue; 1085 if (p[len - 1] == '\n') 1086 p[--len] = '\0'; 1087 if (EMPTYSTR(p)) 1088 continue; 1089 1090 NEXTWORD(p, word); 1091 NEXTWORD(p, perm); 1092 NEXTWORD(p, class); 1093 if (EMPTYSTR(word)) 1094 continue; 1095 if (!EMPTYSTR(class)) { 1096 if (strcasecmp(class, "all") == 0 || 1097 strcasecmp(class, "none") == 0) { 1098 syslog(LOG_WARNING, 1099 "%s line %d: illegal user-defined class `%s' - skipping entry", 1100 fname, (int)line, class); 1101 continue; 1102 } 1103 } 1104 1105 /* have a host specifier */ 1106 if ((p = strchr(word, '@')) != NULL) { 1107 unsigned char net[16], mask[16], *addr; 1108 int addrlen, bits, bytes, a; 1109 1110 *p++ = '\0'; 1111 /* check against network or CIDR */ 1112 memset(net, 0x00, sizeof(net)); 1113 if ((bits = inet_net_pton(his_addr.su_family, p, net, 1114 sizeof(net))) != -1) { 1115#ifdef INET6 1116 if (his_addr.su_family == AF_INET) { 1117#endif 1118 addrlen = 4; 1119 addr = (unsigned char *)&his_addr.su_addr; 1120#ifdef INET6 1121 } else { 1122 addrlen = 16; 1123 addr = (unsigned char *)&his_addr.su_6addr; 1124 } 1125#endif 1126 bytes = bits / 8; 1127 bits = bits % 8; 1128 if (bytes > 0) 1129 memset(mask, 0xFF, bytes); 1130 if (bytes < addrlen) 1131 mask[bytes] = 0xFF << (8 - bits); 1132 if (bytes + 1 < addrlen) 1133 memset(mask + bytes + 1, 0x00, 1134 addrlen - bytes - 1); 1135 for (a = 0; a < addrlen; a++) 1136 if ((addr[a] & mask[a]) != net[a]) 1137 break; 1138 if (a < addrlen) 1139 continue; 1140 1141 /* check against hostname glob */ 1142 } else if (fnmatch(p, remotehost, FNM_CASEFOLD) != 0) 1143 continue; 1144 } 1145 1146 /* have a group specifier */ 1147 if ((p = strchr(word, ':')) != NULL) { 1148 gid_t *groups, *ng; 1149 int gsize, i, found; 1150 1151 if (pw == NULL) 1152 continue; /* no match for unknown user */ 1153 *p++ = '\0'; 1154 groups = NULL; 1155 gsize = 16; 1156 do { 1157 ng = realloc(groups, gsize * sizeof(gid_t)); 1158 if (ng == NULL) 1159 fatal( 1160 "Local resource failure: realloc"); 1161 groups = ng; 1162 } while (getgrouplist(pw->pw_name, pw->pw_gid, 1163 groups, &gsize) == -1); 1164 found = 0; 1165 for (i = 0; i < gsize; i++) { 1166 struct group *g; 1167 1168 if ((g = getgrgid(groups[i])) == NULL) 1169 continue; 1170 if (fnmatch(p, g->gr_name, 0) == 0) { 1171 found = 1; 1172 break; 1173 } 1174 } 1175 free(groups); 1176 if (!found) 1177 continue; 1178 } 1179 1180 /* check against username glob */ 1181 if (fnmatch(word, name, 0) != 0) 1182 continue; 1183 1184 if (perm != NULL && 1185 ((strcasecmp(perm, "allow") == 0) || 1186 (strcasecmp(perm, "yes") == 0))) 1187 retval = 1; 1188 else if (perm != NULL && 1189 ((strcasecmp(perm, "deny") == 0) || 1190 (strcasecmp(perm, "no") == 0))) 1191 retval = 0; 1192 else 1193 retval = !def; 1194 if (!EMPTYSTR(class) && retclass != NULL) 1195 *retclass = ftpd_strdup(class); 1196 free(buf); 1197 break; 1198 } 1199 (void) fclose(fd); 1200 return (retval); 1201} 1202 1203/* 1204 * Check if user is allowed by /etc/ftpusers 1205 * returns 1 for yes, 0 for no 1206 * 1207 * NOTE: needs struct passwd *pw setup (for checkuser()) 1208 */ 1209static int 1210checkaccess(const char *name) 1211{ 1212 1213 return (checkuser(_NAME_FTPUSERS, name, 1, 0, NULL)); 1214} 1215 1216static void 1217login_utmp(const char *line, const char *name, const char *host, 1218 struct sockinet *haddr) 1219{ 1220#if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 1221 struct timeval tv; 1222 (void)gettimeofday(&tv, NULL); 1223#endif 1224#ifdef SUPPORT_UTMPX 1225 if (doutmp) { 1226 (void)memset(&utmpx, 0, sizeof(utmpx)); 1227 utmpx.ut_tv = tv; 1228 utmpx.ut_pid = getpid(); 1229 utmpx.ut_id[0] = 'f'; 1230 utmpx.ut_id[1] = 't'; 1231 utmpx.ut_id[2] = 'p'; 1232 utmpx.ut_id[3] = '*'; 1233 utmpx.ut_type = USER_PROCESS; 1234 (void)strncpy(utmpx.ut_name, name, sizeof(utmpx.ut_name)); 1235 (void)strncpy(utmpx.ut_line, line, sizeof(utmpx.ut_line)); 1236 (void)strncpy(utmpx.ut_host, host, sizeof(utmpx.ut_host)); 1237 (void)memcpy(&utmpx.ut_ss, &haddr->si_su, haddr->su_len); 1238 ftpd_loginx(&utmpx); 1239 } 1240 if (dowtmp) 1241 ftpd_logwtmpx(line, name, host, haddr, 0, USER_PROCESS); 1242#endif 1243#ifdef SUPPORT_UTMP 1244 if (doutmp) { 1245 (void)memset(&utmp, 0, sizeof(utmp)); 1246 (void)time(&utmp.ut_time); 1247 (void)strncpy(utmp.ut_name, name, sizeof(utmp.ut_name)); 1248 (void)strncpy(utmp.ut_line, line, sizeof(utmp.ut_line)); 1249 (void)strncpy(utmp.ut_host, host, sizeof(utmp.ut_host)); 1250 ftpd_login(&utmp); 1251 } 1252 if (dowtmp) 1253 ftpd_logwtmp(line, name, host); 1254#endif 1255} 1256 1257static void 1258logout_utmp(void) 1259{ 1260#ifdef SUPPORT_UTMPX 1261 int okwtmpx = dowtmp; 1262#endif 1263#ifdef SUPPORT_UTMP 1264 int okwtmp = dowtmp; 1265#endif 1266 if (logged_in) { 1267#ifdef SUPPORT_UTMPX 1268 if (doutmp) 1269 okwtmpx &= ftpd_logoutx(ttyline, 0, DEAD_PROCESS); 1270 if (okwtmpx) 1271 ftpd_logwtmpx(ttyline, "", "", NULL, 0, DEAD_PROCESS); 1272#endif 1273#ifdef SUPPORT_UTMP 1274 if (doutmp) 1275 okwtmp &= ftpd_logout(ttyline); 1276 if (okwtmp) 1277 ftpd_logwtmp(ttyline, "", ""); 1278#endif 1279 } 1280} 1281 1282/* 1283 * Terminate login as previous user (if any), resetting state; 1284 * used when USER command is given or login fails. 1285 */ 1286static void 1287end_login(void) 1288{ 1289#ifdef USE_PAM 1290 int e; 1291#endif 1292 logout_utmp(); 1293 show_chdir_messages(-1); /* flush chdir cache */ 1294 if (pw != NULL && pw->pw_passwd != NULL) 1295 memset(pw->pw_passwd, 0, strlen(pw->pw_passwd)); 1296 pw = NULL; 1297 logged_in = 0; 1298 askpasswd = 0; 1299 permitted = 0; 1300 quietmessages = 0; 1301 gidcount = 0; 1302 curclass.type = CLASS_REAL; 1303 if (!dropprivs) { 1304 if (seteuid((uid_t)0) < 0) { 1305 syslog(LOG_NOTICE, "end_login: can't seteuid 0: %m"); 1306 fatal("Can't reset privileges."); 1307 } 1308 } 1309#ifdef LOGIN_CAP 1310 setusercontext(NULL, getpwuid(0), 0, 1311 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1312#endif 1313#ifdef USE_PAM 1314 if (pamh) { 1315 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1316 syslog(LOG_ERR, "pam_setcred: %s", 1317 pam_strerror(pamh, e)); 1318 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1319 syslog(LOG_ERR, "pam_close_session: %s", 1320 pam_strerror(pamh, e)); 1321 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1322 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1323 pamh = NULL; 1324 } 1325#endif 1326} 1327 1328void 1329pass(const char *passwd) 1330{ 1331 do_pass(0, 0, passwd); 1332} 1333 1334/* 1335 * Perform the passwd confirmation and login. 1336 * 1337 * If pass_checked is zero, confirm passwd is correct, & ignore pass_rval. 1338 * This is the traditional PASS implementation. 1339 * 1340 * If pass_checked is non-zero, use pass_rval and ignore passwd. 1341 * This is used by auth_pam() which has already parsed PASS. 1342 * This only applies to curclass.type != CLASS_GUEST. 1343 */ 1344static void 1345do_pass(int pass_checked, int pass_rval, const char *passwd) 1346{ 1347 int rval; 1348 char root[MAXPATHLEN]; 1349#ifdef LOGIN_CAP 1350 login_cap_t *lc = NULL; 1351#endif 1352#ifdef USE_PAM 1353 int e; 1354#endif 1355 1356 rval = 1; 1357 1358 if (logged_in || askpasswd == 0) { 1359 reply(503, "Login with USER first."); 1360 return; 1361 } 1362 askpasswd = 0; 1363 if (curclass.type != CLASS_GUEST) { 1364 /* "ftp" is the only account allowed with no password */ 1365 if (pw == NULL) { 1366 rval = 1; /* failure below */ 1367 goto skip; 1368 } 1369 if (pass_checked) { /* password validated in user() */ 1370 rval = pass_rval; 1371 goto skip; 1372 } 1373#ifdef USE_PAM 1374 syslog(LOG_ERR, "do_pass: USE_PAM shouldn't get here"); 1375 rval = 1; 1376 goto skip; 1377#endif 1378#if defined(KERBEROS) 1379 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 1380 rval = 0; 1381 goto skip; 1382 } 1383#endif 1384#if defined(KERBEROS5) 1385 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 1386 rval = 0; 1387 goto skip; 1388 } 1389#endif 1390#ifdef SKEY 1391 if (skey_haskey(pw->pw_name) == 0) { 1392 char *p; 1393 int r; 1394 1395 p = ftpd_strdup(passwd); 1396 r = skey_passcheck(pw->pw_name, p); 1397 free(p); 1398 if (r != -1) { 1399 rval = 0; 1400 goto skip; 1401 } 1402 } 1403#endif 1404 if (!sflag) 1405 rval = checkpassword(pw, passwd); 1406 else 1407 rval = 1; 1408 1409 skip: 1410 1411 /* 1412 * If rval > 0, the user failed the authentication check 1413 * above. If rval == 0, either Kerberos or local 1414 * authentication succeeded. 1415 */ 1416 if (rval) { 1417 reply(530, "%s", rval == 2 ? "Password expired." : 1418 "Login incorrect."); 1419 pfilter_notify(1, rval == 2 ? "exppass" : "badpass"); 1420 if (logging) { 1421 syslog(LOG_NOTICE, 1422 "FTP LOGIN FAILED FROM %s", remoteloghost); 1423 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1424 "FTP LOGIN FAILED FROM %s, %s", 1425 remoteloghost, curname); 1426 } 1427 pw = NULL; 1428 if (login_attempts++ >= 5) { 1429 syslog(LOG_NOTICE, 1430 "repeated login failures from %s", 1431 remoteloghost); 1432 exit(0); 1433 } 1434 return; 1435 } 1436 } 1437 1438 /* password ok; check if anything else prevents login */ 1439 if (! permitted) { 1440 reply(530, "User %s may not use FTP.", pw->pw_name); 1441 if (logging) 1442 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 1443 remoteloghost, pw->pw_name); 1444 goto bad; 1445 } 1446 1447 login_attempts = 0; /* this time successful */ 1448 if (setegid((gid_t)pw->pw_gid) < 0) { 1449 syslog(LOG_NOTICE, "user %s: can't setegid: %m", pw->pw_name); 1450 fatal("Can't drop privileges."); 1451 } 1452#ifdef LOGIN_CAP 1453 if ((lc = login_getpwclass(pw)) != NULL) { 1454#ifdef notyet 1455 char remote_ip[NI_MAXHOST]; 1456 1457 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1458 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1459 NI_NUMERICHOST)) 1460 *remote_ip = 0; 1461 remote_ip[sizeof(remote_ip) - 1] = 0; 1462 if (!auth_hostok(lc, remotehost, remote_ip)) { 1463 pfilter_notify(1, "bannedhost"); 1464 syslog(LOG_INFO|LOG_AUTH, 1465 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1466 pw->pw_name); 1467 reply(530, "Permission denied."); 1468 pw = NULL; 1469 return; 1470 } 1471 if (!auth_timeok(lc, time(NULL))) { 1472 reply(530, "Login not available right now."); 1473 pw = NULL; 1474 return; 1475 } 1476#endif 1477 } 1478 setsid(); 1479 setusercontext(lc, pw, 0, 1480 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1481 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1482#else 1483 (void) initgroups(pw->pw_name, pw->pw_gid); 1484 /* cache groups for cmds.c::matchgroup() */ 1485#endif 1486#ifdef USE_PAM 1487 if (pamh) { 1488 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1489 syslog(LOG_ERR, "pam_open_session: %s", 1490 pam_strerror(pamh, e)); 1491 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) 1492 != PAM_SUCCESS) { 1493 syslog(LOG_ERR, "pam_setcred: %s", 1494 pam_strerror(pamh, e)); 1495 } 1496 } 1497#endif 1498 gidcount = getgroups(0, NULL); 1499 if (gidlist) 1500 free(gidlist); 1501 gidlist = malloc(gidcount * sizeof *gidlist); 1502 gidcount = getgroups(gidcount, gidlist); 1503 1504 /* open utmp/wtmp before chroot */ 1505 login_utmp(ttyline, pw->pw_name, remotehost, &his_addr); 1506 1507 logged_in = 1; 1508 1509 connections = 1; 1510 if (dopidfile) 1511 count_users(); 1512 if (curclass.limit != -1 && connections > curclass.limit) { 1513 if (! EMPTYSTR(curclass.limitfile)) 1514 (void)display_file(conffilename(curclass.limitfile), 1515 530); 1516 reply(530, 1517 "User %s access denied, connection limit of " LLF 1518 " reached.", 1519 pw->pw_name, (LLT)curclass.limit); 1520 syslog(LOG_NOTICE, 1521 "Maximum connection limit of " LLF 1522 " for class %s reached, login refused for %s", 1523 (LLT)curclass.limit, curclass.classname, pw->pw_name); 1524 goto bad; 1525 } 1526 1527 homedir[0] = '/'; 1528 switch (curclass.type) { 1529 case CLASS_GUEST: 1530 /* 1531 * We MUST do a chdir() after the chroot. Otherwise 1532 * the old current directory will be accessible as "." 1533 * outside the new root! 1534 */ 1535 format_path(root, 1536 curclass.chroot ? curclass.chroot : 1537 anondir ? anondir : 1538 pw->pw_dir); 1539 format_path(homedir, 1540 curclass.homedir ? curclass.homedir : 1541 "/"); 1542 if (EMPTYSTR(homedir)) 1543 homedir[0] = '/'; 1544 if (EMPTYSTR(root) || chroot(root) < 0) { 1545 syslog(LOG_NOTICE, 1546 "GUEST user %s: can't chroot to %s: %m", 1547 pw->pw_name, root); 1548 goto bad_guest; 1549 } 1550 if (chdir(homedir) < 0) { 1551 syslog(LOG_NOTICE, 1552 "GUEST user %s: can't chdir to %s: %m", 1553 pw->pw_name, homedir); 1554 bad_guest: 1555 fatal("Can't set guest privileges."); 1556 } 1557 break; 1558 case CLASS_CHROOT: 1559 format_path(root, 1560 curclass.chroot ? curclass.chroot : 1561 pw->pw_dir); 1562 format_path(homedir, 1563 curclass.homedir ? curclass.homedir : 1564 "/"); 1565 if (EMPTYSTR(homedir)) 1566 homedir[0] = '/'; 1567 if (EMPTYSTR(root) || chroot(root) < 0) { 1568 syslog(LOG_NOTICE, 1569 "CHROOT user %s: can't chroot to %s: %m", 1570 pw->pw_name, root); 1571 goto bad_chroot; 1572 } 1573 if (chdir(homedir) < 0) { 1574 syslog(LOG_NOTICE, 1575 "CHROOT user %s: can't chdir to %s: %m", 1576 pw->pw_name, homedir); 1577 bad_chroot: 1578 fatal("Can't change root."); 1579 } 1580 break; 1581 case CLASS_REAL: 1582 /* only chroot REAL if explicitly requested */ 1583 if (! EMPTYSTR(curclass.chroot)) { 1584 format_path(root, curclass.chroot); 1585 if (EMPTYSTR(root) || chroot(root) < 0) { 1586 syslog(LOG_NOTICE, 1587 "REAL user %s: can't chroot to %s: %m", 1588 pw->pw_name, root); 1589 goto bad_chroot; 1590 } 1591 } 1592 format_path(homedir, 1593 curclass.homedir ? curclass.homedir : 1594 pw->pw_dir); 1595 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1596 if (chdir("/") < 0) { 1597 syslog(LOG_NOTICE, 1598 "REAL user %s: can't chdir to %s: %m", 1599 pw->pw_name, 1600 !EMPTYSTR(homedir) ? homedir : "/"); 1601 reply(530, 1602 "User %s: can't change directory to %s.", 1603 pw->pw_name, 1604 !EMPTYSTR(homedir) ? homedir : "/"); 1605 goto bad; 1606 } else { 1607 reply(-230, 1608 "No directory! Logging in with home=/"); 1609 homedir[0] = '/'; 1610 } 1611 } 1612 break; 1613 } 1614#ifndef LOGIN_CAP 1615 setsid(); 1616 setlogin(pw->pw_name); 1617#endif 1618 if (dropprivs || 1619 (curclass.type != CLASS_REAL && 1620 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1621 dropprivs++; 1622 if (setgid((gid_t)pw->pw_gid) < 0) { 1623 syslog(LOG_NOTICE, "user %s: can't setgid: %m", pw->pw_name); 1624 fatal("Can't drop privileges."); 1625 } 1626 if (setuid((uid_t)pw->pw_uid) < 0) { 1627 syslog(LOG_NOTICE, "user %s: can't setuid: %m", pw->pw_name); 1628 fatal("Can't drop privileges."); 1629 } 1630 } else { 1631 if (seteuid((uid_t)pw->pw_uid) < 0) { 1632 syslog(LOG_NOTICE, "user %s: can't seteuid: %m", pw->pw_name); 1633 fatal("Can't drop privileges."); 1634 } 1635 } 1636 setenv("HOME", homedir, 1); 1637 1638 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1639 quietmessages = 1; 1640 1641 /* 1642 * Display a login message, if it exists. 1643 * N.B. reply(230,) must follow the message. 1644 */ 1645 if (! EMPTYSTR(curclass.motd)) 1646 (void)display_file(conffilename(curclass.motd), 230); 1647 show_chdir_messages(230); 1648 if (curclass.type == CLASS_GUEST) { 1649 char *p; 1650 1651 reply(230, "Guest login ok, access restrictions apply."); 1652#if defined(HAVE_SETPROCTITLE) 1653 snprintf(proctitle, sizeof(proctitle), 1654 "%s: anonymous/%s", remotehost, passwd); 1655 setproctitle("%s", proctitle); 1656#endif /* defined(HAVE_SETPROCTITLE) */ 1657 if (logging) 1658 syslog(LOG_INFO, 1659 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1660 remoteloghost, passwd, 1661 curclass.classname, CURCLASSTYPE); 1662 /* store guest password reply into pw_passwd */ 1663 REASSIGN(pw->pw_passwd, ftpd_strdup(passwd)); 1664 for (p = pw->pw_passwd; *p; p++) 1665 if (!isgraph((unsigned char)*p)) 1666 *p = '_'; 1667 } else { 1668 reply(230, "User %s logged in.", pw->pw_name); 1669#if defined(HAVE_SETPROCTITLE) 1670 snprintf(proctitle, sizeof(proctitle), 1671 "%s: %s", remotehost, pw->pw_name); 1672 setproctitle("%s", proctitle); 1673#endif /* defined(HAVE_SETPROCTITLE) */ 1674 if (logging) 1675 syslog(LOG_INFO, 1676 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1677 remoteloghost, pw->pw_name, 1678 curclass.classname, CURCLASSTYPE); 1679 } 1680 (void) umask(curclass.umask); 1681#ifdef LOGIN_CAP 1682 login_close(lc); 1683#endif 1684 return; 1685 1686 bad: 1687#ifdef LOGIN_CAP 1688 login_close(lc); 1689#endif 1690 /* Forget all about it... */ 1691 end_login(); 1692} 1693 1694void 1695retrieve(const char *argv[], const char *name) 1696{ 1697 FILE *fin, *dout; 1698 struct stat st; 1699 int (*closefunc)(FILE *) = NULL; 1700 int dolog, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1701 struct timeval start, finish, td, *tdp; 1702 struct rusage rusage_before, rusage_after; 1703 const char *dispname; 1704 const char *error; 1705 1706 sendrv = closerv = stderrfd = -1; 1707 isconversion = isdata = isls = dolog = 0; 1708 tdp = NULL; 1709 dispname = name; 1710 fin = dout = NULL; 1711 error = NULL; 1712 if (argv == NULL) { /* if not running a command ... */ 1713 dolog = 1; 1714 isdata = 1; 1715 fin = fopen(name, "r"); 1716 closefunc = fclose; 1717 if (fin == NULL) /* doesn't exist?; try a conversion */ 1718 argv = do_conversion(name); 1719 if (argv != NULL) { 1720 isconversion++; 1721 syslog(LOG_DEBUG, "get command: '%s' on '%s'", 1722 argv[0], name); 1723 } 1724 } 1725 if (argv != NULL) { 1726 char temp[MAXPATHLEN]; 1727 1728 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1729 isls = 1; 1730 stderrfd = -1; 1731 } else { 1732 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1733 stderrfd = mkstemp(temp); 1734 if (stderrfd != -1) 1735 (void)unlink(temp); 1736 } 1737 dispname = argv[0]; 1738 fin = ftpd_popen(argv, "r", stderrfd); 1739 closefunc = ftpd_pclose; 1740 st.st_size = -1; 1741 st.st_blksize = BUFSIZ; 1742 } 1743 if (fin == NULL) { 1744 if (errno != 0) { 1745 perror_reply(550, dispname); 1746 if (dolog) 1747 logxfer("get", -1, name, NULL, NULL, 1748 strerror(errno)); 1749 } 1750 goto cleanupretrieve; 1751 } 1752 byte_count = -1; 1753 if (argv == NULL 1754 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1755 error = "Not a plain file"; 1756 reply(550, "%s: %s.", dispname, error); 1757 goto done; 1758 } 1759 if (restart_point) { 1760 if (type == TYPE_A) { 1761 off_t i; 1762 int c; 1763 1764 for (i = 0; i < restart_point; i++) { 1765 if ((c=getc(fin)) == EOF) { 1766 error = strerror(errno); 1767 perror_reply(550, dispname); 1768 goto done; 1769 } 1770 if (c == '\n') 1771 i++; 1772 } 1773 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1774 error = strerror(errno); 1775 perror_reply(550, dispname); 1776 goto done; 1777 } 1778 } 1779 dout = dataconn(dispname, st.st_size, "w"); 1780 if (dout == NULL) 1781 goto done; 1782 1783 (void)getrusage(RUSAGE_SELF, &rusage_before); 1784 (void)gettimeofday(&start, NULL); 1785 sendrv = send_data(fin, dout, &st, isdata); 1786 (void)gettimeofday(&finish, NULL); 1787 (void)getrusage(RUSAGE_SELF, &rusage_after); 1788 closedataconn(dout); /* close now to affect timing stats */ 1789 timersub(&finish, &start, &td); 1790 tdp = &td; 1791 done: 1792 if (dolog) { 1793 logxfer("get", byte_count, name, NULL, tdp, error); 1794 if (tdp != NULL) 1795 logrusage(&rusage_before, &rusage_after); 1796 } 1797 closerv = (*closefunc)(fin); 1798 if (sendrv == 0) { 1799 FILE *errf; 1800 struct stat sb; 1801 1802 if (!isls && argv != NULL && closerv != 0) { 1803 reply(-226, 1804 "Command returned an exit status of %d", 1805 closerv); 1806 if (isconversion) 1807 syslog(LOG_WARNING, 1808 "retrieve command: '%s' returned %d", 1809 argv[0], closerv); 1810 } 1811 if (!isls && argv != NULL && stderrfd != -1 && 1812 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1813 ((errf = fdopen(stderrfd, "r")) != NULL)) { 1814 char *cp, line[LINE_MAX]; 1815 1816 reply(-226, "Command error messages:"); 1817 rewind(errf); 1818 while (fgets(line, sizeof(line), errf) != NULL) { 1819 if ((cp = strchr(line, '\n')) != NULL) 1820 *cp = '\0'; 1821 reply(0, " %s", line); 1822 } 1823 (void) fflush(stdout); 1824 (void) fclose(errf); 1825 /* a reply(226,) must follow */ 1826 } 1827 reply(226, "Transfer complete."); 1828 } 1829 cleanupretrieve: 1830 if (stderrfd != -1) 1831 (void)close(stderrfd); 1832 if (isconversion) 1833 free(argv); 1834} 1835 1836void 1837store(const char *name, const char *fmode, int unique) 1838{ 1839 FILE *fout, *din; 1840 struct stat st; 1841 int (*closefunc)(FILE *); 1842 struct timeval start, finish, td, *tdp; 1843 const char *desc, *error; 1844 1845 din = NULL; 1846 desc = (*fmode == 'w') ? "put" : "append"; 1847 error = NULL; 1848 if (unique && stat(name, &st) == 0 && 1849 (name = gunique(name)) == NULL) { 1850 logxfer(desc, -1, name, NULL, NULL, 1851 "cannot create unique file"); 1852 goto cleanupstore; 1853 } 1854 1855 if (restart_point) 1856 fmode = "r+"; 1857 fout = fopen(name, fmode); 1858 closefunc = fclose; 1859 tdp = NULL; 1860 if (fout == NULL) { 1861 perror_reply(553, name); 1862 logxfer(desc, -1, name, NULL, NULL, strerror(errno)); 1863 goto cleanupstore; 1864 } 1865 byte_count = -1; 1866 if (restart_point) { 1867 if (type == TYPE_A) { 1868 off_t i; 1869 int c; 1870 1871 for (i = 0; i < restart_point; i++) { 1872 if ((c=getc(fout)) == EOF) { 1873 error = strerror(errno); 1874 perror_reply(550, name); 1875 goto done; 1876 } 1877 if (c == '\n') 1878 i++; 1879 } 1880 /* 1881 * We must do this seek to "current" position 1882 * because we are changing from reading to 1883 * writing. 1884 */ 1885 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1886 error = strerror(errno); 1887 perror_reply(550, name); 1888 goto done; 1889 } 1890 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1891 error = strerror(errno); 1892 perror_reply(550, name); 1893 goto done; 1894 } 1895 } 1896 din = dataconn(name, (off_t)-1, "r"); 1897 if (din == NULL) 1898 goto done; 1899 (void)gettimeofday(&start, NULL); 1900 if (receive_data(din, fout) == 0) { 1901 if (unique) 1902 reply(226, "Transfer complete (unique file name:%s).", 1903 name); 1904 else 1905 reply(226, "Transfer complete."); 1906 } 1907 (void)gettimeofday(&finish, NULL); 1908 closedataconn(din); /* close now to affect timing stats */ 1909 timersub(&finish, &start, &td); 1910 tdp = &td; 1911 done: 1912 logxfer(desc, byte_count, name, NULL, tdp, error); 1913 (*closefunc)(fout); 1914 cleanupstore: 1915 ; 1916} 1917 1918static FILE * 1919getdatasock(const char *fmode) 1920{ 1921 int on, s, t, tries; 1922 in_port_t port; 1923 1924 on = 1; 1925 if (data >= 0) 1926 return (fdopen(data, fmode)); 1927 if (! dropprivs) { 1928 if (seteuid((uid_t)0) < 0) { 1929 syslog(LOG_NOTICE, "getdatasock: can't seteuid 0: %m"); 1930 fatal("Can't reset privileges."); 1931 } 1932 } 1933 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1934 if (s < 0) 1935 goto bad; 1936 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1937 (char *) &on, sizeof(on)) < 0) 1938 goto bad; 1939 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1940 (char *) &on, sizeof(on)) < 0) 1941 goto bad; 1942 /* anchor socket to avoid multi-homing problems */ 1943 data_source = ctrl_addr; 1944 /* 1945 * By default source port for PORT connctions is 1946 * ctrlport-1 (see RFC959 section 5.2). 1947 * However, if privs have been dropped and that 1948 * would be < IPPORT_RESERVED, use a random port 1949 * instead. 1950 */ 1951 if (dataport) 1952 port = dataport; 1953 else 1954 port = ntohs(ctrl_addr.su_port) - 1; 1955 if (dropprivs && port < IPPORT_RESERVED) 1956 port = 0; /* use random port */ 1957 data_source.su_port = htons(port); 1958 1959 for (tries = 1; ; tries++) { 1960 if (bind(s, (struct sockaddr *)&data_source.si_su, 1961 data_source.su_len) >= 0) 1962 break; 1963 if (errno != EADDRINUSE || tries > 10) 1964 goto bad; 1965 sleep(tries); 1966 } 1967 if (! dropprivs) { 1968 if (seteuid((uid_t)pw->pw_uid) < 0) { 1969 syslog(LOG_NOTICE, "user %s: can't seteuid: %m", pw->pw_name); 1970 fatal("Can't drop privileges."); 1971 } 1972 } 1973#ifdef IP_TOS 1974 if (!mapped && ctrl_addr.su_family == AF_INET) { 1975 on = IPTOS_THROUGHPUT; 1976 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1977 sizeof(int)) < 0) 1978 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1979 } 1980#endif 1981 return (fdopen(s, fmode)); 1982 bad: 1983 /* Return the real value of errno (close may change it) */ 1984 t = errno; 1985 if (! dropprivs) { 1986 if (seteuid((uid_t)pw->pw_uid) < 0) { 1987 syslog(LOG_NOTICE, "user %s: can't seteuid: %m", pw->pw_name); 1988 fatal("Can't drop privileges."); 1989 } 1990 } 1991 if (s >= 0) 1992 (void) close(s); 1993 errno = t; 1994 return (NULL); 1995} 1996 1997FILE * 1998dataconn(const char *name, off_t size, const char *fmode) 1999{ 2000 char sizebuf[32]; 2001 FILE *file; 2002 int retry, tos, keepalive, conerrno; 2003 2004 file_size = size; 2005 byte_count = 0; 2006 if (size != (off_t) -1) 2007 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 2008 (LLT)size, PLURAL(size)); 2009 else 2010 sizebuf[0] = '\0'; 2011 if (pdata >= 0) { 2012 struct sockinet from; 2013 int s; 2014 socklen_t fromlen = sizeof(from.su_len); 2015 2016 (void) alarm(curclass.timeout); 2017 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 2018 (void) alarm(0); 2019 if (s < 0) { 2020 reply(425, "Can't open data connection."); 2021 (void) close(pdata); 2022 pdata = -1; 2023 return (NULL); 2024 } 2025 (void) close(pdata); 2026 pdata = s; 2027 switch (from.su_family) { 2028 case AF_INET: 2029#ifdef IP_TOS 2030 if (!mapped) { 2031 tos = IPTOS_THROUGHPUT; 2032 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 2033 (char *)&tos, sizeof(int)); 2034 } 2035 break; 2036#endif 2037 } 2038 /* Set keepalives on the socket to detect dropped conns. */ 2039#ifdef SO_KEEPALIVE 2040 keepalive = 1; 2041 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 2042 (char *)&keepalive, sizeof(int)); 2043#endif 2044 reply(150, "Opening %s mode data connection for '%s'%s.", 2045 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2046 return (fdopen(pdata, fmode)); 2047 } 2048 if (data >= 0) { 2049 reply(125, "Using existing data connection for '%s'%s.", 2050 name, sizebuf); 2051 usedefault = 1; 2052 return (fdopen(data, fmode)); 2053 } 2054 if (usedefault) 2055 data_dest = his_addr; 2056 usedefault = 1; 2057 retry = conerrno = 0; 2058 do { 2059 file = getdatasock(fmode); 2060 if (file == NULL) { 2061 char hbuf[NI_MAXHOST]; 2062 char pbuf[NI_MAXSERV]; 2063 conerrno = errno; 2064 if (getnameinfo((struct sockaddr *)&data_source.si_su, 2065 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 2066 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV)) 2067 strlcpy(hbuf, "?", sizeof(hbuf)); 2068 reply(425, "Can't create data socket (%s,%s): %s.", 2069 hbuf, pbuf, strerror(conerrno)); 2070 return (NULL); 2071 } 2072 data = fileno(file); 2073 conerrno = 0; 2074 if (connect(data, (struct sockaddr *)&data_dest.si_su, 2075 data_dest.su_len) == 0) 2076 break; 2077 conerrno = errno; 2078 (void) fclose(file); 2079 file = NULL; 2080 data = -1; 2081 if (conerrno == EADDRINUSE) { 2082 sleep((unsigned) swaitint); 2083 retry += swaitint; 2084 } else { 2085 break; 2086 } 2087 } while (retry <= swaitmax); 2088 if (conerrno != 0) { 2089 perror_reply(425, "Can't build data connection"); 2090 return (NULL); 2091 } 2092 reply(150, "Opening %s mode data connection for '%s'%s.", 2093 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2094 return (file); 2095} 2096 2097void 2098closedataconn(FILE *fd) 2099{ 2100 2101 if (fd == NULL) 2102 return; 2103 (void)fclose(fd); 2104 data = -1; 2105 if (pdata >= 0) 2106 (void)close(pdata); 2107 pdata = -1; 2108} 2109 2110int 2111write_data(int fd, char *buf, size_t size, off_t *bufrem, 2112 struct timeval *then, int isdata) 2113{ 2114 struct timeval now, td; 2115 ssize_t c; 2116 2117 while (size > 0) { 2118 c = size; 2119 if (curclass.writesize) { 2120 if (curclass.writesize < c) 2121 c = curclass.writesize; 2122 } 2123 if (curclass.rateget) { 2124 if (*bufrem < c) 2125 c = *bufrem; 2126 } 2127 (void) alarm(curclass.timeout); 2128 c = write(fd, buf, c); 2129 if (c <= 0) 2130 return (1); 2131 buf += c; 2132 size -= c; 2133 byte_count += c; 2134 if (isdata) { 2135 total_data_out += c; 2136 total_data += c; 2137 } 2138 total_bytes_out += c; 2139 total_bytes += c; 2140 if (curclass.rateget) { 2141 *bufrem -= c; 2142 if (*bufrem == 0) { 2143 (void)gettimeofday(&now, NULL); 2144 timersub(&now, then, &td); 2145 if (td.tv_sec == 0) { 2146 usleep(1000000 - td.tv_usec); 2147 (void)gettimeofday(then, NULL); 2148 } else 2149 *then = now; 2150 *bufrem = curclass.rateget; 2151 } 2152 } 2153 } 2154 return (0); 2155} 2156 2157static enum send_status 2158send_data_with_read(int filefd, int netfd, const struct stat *st, int isdata) 2159{ 2160 struct timeval then; 2161 off_t bufrem; 2162 ssize_t readsize; 2163 char *buf; 2164 int c, error; 2165 2166 if (curclass.readsize > 0) 2167 readsize = curclass.readsize; 2168 else 2169 readsize = st->st_blksize; 2170 if ((buf = malloc(readsize)) == NULL) { 2171 perror_reply(451, "Local resource failure: malloc"); 2172 return (SS_NO_TRANSFER); 2173 } 2174 2175 if (curclass.rateget) { 2176 bufrem = curclass.rateget; 2177 (void)gettimeofday(&then, NULL); 2178 } else 2179 bufrem = readsize; 2180 for (;;) { 2181 (void) alarm(curclass.timeout); 2182 c = read(filefd, buf, readsize); 2183 if (c == 0) 2184 error = SS_SUCCESS; 2185 else if (c < 0) 2186 error = SS_FILE_ERROR; 2187 else if (write_data(netfd, buf, c, &bufrem, &then, isdata)) 2188 error = SS_DATA_ERROR; 2189 else if (urgflag && handleoobcmd()) 2190 error = SS_ABORTED; 2191 else 2192 continue; 2193 2194 free(buf); 2195 return (error); 2196 } 2197} 2198 2199static enum send_status 2200send_data_with_mmap(int filefd, int netfd, const struct stat *st, int isdata) 2201{ 2202 struct timeval then; 2203 off_t bufrem, filesize, off, origoff; 2204 ssize_t mapsize, winsize; 2205 int error, sendbufsize, sendlowat; 2206 void *win; 2207 2208 bufrem = 0; 2209 if (curclass.sendbufsize) { 2210 sendbufsize = curclass.sendbufsize; 2211 if (setsockopt(netfd, SOL_SOCKET, SO_SNDBUF, 2212 &sendbufsize, sizeof(int)) == -1) 2213 syslog(LOG_WARNING, "setsockopt(SO_SNDBUF, %d): %m", 2214 sendbufsize); 2215 } 2216 2217 if (curclass.sendlowat) { 2218 sendlowat = curclass.sendlowat; 2219 if (setsockopt(netfd, SOL_SOCKET, SO_SNDLOWAT, 2220 &sendlowat, sizeof(int)) == -1) 2221 syslog(LOG_WARNING, "setsockopt(SO_SNDLOWAT, %d): %m", 2222 sendlowat); 2223 } 2224 2225 winsize = curclass.mmapsize; 2226 filesize = st->st_size; 2227 if (ftpd_debug) 2228 syslog(LOG_INFO, "mmapsize = " LLF ", writesize = " LLF, 2229 (LLT)winsize, (LLT)curclass.writesize); 2230 if (winsize <= 0) 2231 goto try_read; 2232 2233 off = lseek(filefd, (off_t)0, SEEK_CUR); 2234 if (off == -1) 2235 goto try_read; 2236 2237 origoff = off; 2238 if (curclass.rateget) { 2239 bufrem = curclass.rateget; 2240 (void)gettimeofday(&then, NULL); 2241 } else 2242 bufrem = winsize; 2243 while (1) { 2244 mapsize = MIN(filesize - off, winsize); 2245 if (mapsize == 0) 2246 break; 2247 win = mmap(NULL, mapsize, PROT_READ, 2248 MAP_FILE|MAP_SHARED, filefd, off); 2249 if (win == MAP_FAILED) { 2250 if (off == origoff) 2251 goto try_read; 2252 return (SS_FILE_ERROR); 2253 } 2254 (void) madvise(win, mapsize, MADV_SEQUENTIAL); 2255 error = write_data(netfd, win, mapsize, &bufrem, &then, 2256 isdata); 2257 (void) madvise(win, mapsize, MADV_DONTNEED); 2258 munmap(win, mapsize); 2259 if (urgflag && handleoobcmd()) 2260 return (SS_ABORTED); 2261 if (error) 2262 return (SS_DATA_ERROR); 2263 off += mapsize; 2264 } 2265 return (SS_SUCCESS); 2266 2267 try_read: 2268 return (send_data_with_read(filefd, netfd, st, isdata)); 2269} 2270 2271/* 2272 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2273 * encapsulation of the data subject to Mode, Structure, and Type. 2274 * 2275 * NB: Form isn't handled. 2276 */ 2277static int 2278send_data(FILE *instr, FILE *outstr, const struct stat *st, int isdata) 2279{ 2280 int c, filefd, netfd, rval; 2281 2282 urgflag = 0; 2283 transflag = 1; 2284 rval = -1; 2285 2286 switch (type) { 2287 2288 case TYPE_A: 2289 /* XXXLUKEM: rate limit ascii send (get) */ 2290 (void) alarm(curclass.timeout); 2291 while ((c = getc(instr)) != EOF) { 2292 if (urgflag && handleoobcmd()) 2293 goto cleanup_send_data; 2294 byte_count++; 2295 if (c == '\n') { 2296 if (ferror(outstr)) 2297 goto data_err; 2298 (void) putc('\r', outstr); 2299 if (isdata) { 2300 total_data_out++; 2301 total_data++; 2302 } 2303 total_bytes_out++; 2304 total_bytes++; 2305 } 2306 (void) putc(c, outstr); 2307 if (isdata) { 2308 total_data_out++; 2309 total_data++; 2310 } 2311 total_bytes_out++; 2312 total_bytes++; 2313 if ((byte_count % 4096) == 0) 2314 (void) alarm(curclass.timeout); 2315 } 2316 (void) alarm(0); 2317 fflush(outstr); 2318 if (ferror(instr)) 2319 goto file_err; 2320 if (ferror(outstr)) 2321 goto data_err; 2322 rval = 0; 2323 goto cleanup_send_data; 2324 2325 case TYPE_I: 2326 case TYPE_L: 2327 filefd = fileno(instr); 2328 netfd = fileno(outstr); 2329 switch (send_data_with_mmap(filefd, netfd, st, isdata)) { 2330 2331 case SS_SUCCESS: 2332 break; 2333 2334 case SS_ABORTED: 2335 case SS_NO_TRANSFER: 2336 goto cleanup_send_data; 2337 2338 case SS_FILE_ERROR: 2339 goto file_err; 2340 2341 case SS_DATA_ERROR: 2342 goto data_err; 2343 } 2344 rval = 0; 2345 goto cleanup_send_data; 2346 2347 default: 2348 reply(550, "Unimplemented TYPE %d in send_data", type); 2349 goto cleanup_send_data; 2350 } 2351 2352 data_err: 2353 (void) alarm(0); 2354 perror_reply(426, "Data connection"); 2355 goto cleanup_send_data; 2356 2357 file_err: 2358 (void) alarm(0); 2359 perror_reply(551, "Error on input file"); 2360 goto cleanup_send_data; 2361 2362 cleanup_send_data: 2363 (void) alarm(0); 2364 transflag = 0; 2365 urgflag = 0; 2366 if (isdata) { 2367 total_files_out++; 2368 total_files++; 2369 } 2370 total_xfers_out++; 2371 total_xfers++; 2372 return (rval); 2373} 2374 2375/* 2376 * Transfer data from peer to "outstr" using the appropriate encapulation of 2377 * the data subject to Mode, Structure, and Type. 2378 * 2379 * N.B.: Form isn't handled. 2380 */ 2381static int 2382receive_data(FILE *instr, FILE *outstr) 2383{ 2384 int c, netfd, filefd, rval; 2385 int volatile bare_lfs; 2386 off_t byteswritten; 2387 char *buf; 2388 ssize_t readsize; 2389 struct sigaction sa, sa_saved; 2390 struct stat st; 2391 2392 memset(&sa, 0, sizeof(sa)); 2393 sigfillset(&sa.sa_mask); 2394 sa.sa_flags = SA_RESTART; 2395 sa.sa_handler = lostconn; 2396 (void) sigaction(SIGALRM, &sa, &sa_saved); 2397 2398 bare_lfs = 0; 2399 urgflag = 0; 2400 transflag = 1; 2401 rval = -1; 2402 byteswritten = 0; 2403 buf = NULL; 2404 2405#define FILESIZECHECK(x) \ 2406 do { \ 2407 if (curclass.maxfilesize != -1 && \ 2408 (x) > curclass.maxfilesize) { \ 2409 errno = EFBIG; \ 2410 goto file_err; \ 2411 } \ 2412 } while (0) 2413 2414 switch (type) { 2415 2416 case TYPE_I: 2417 case TYPE_L: 2418 netfd = fileno(instr); 2419 filefd = fileno(outstr); 2420 (void) alarm(curclass.timeout); 2421 if (curclass.readsize) 2422 readsize = curclass.readsize; 2423 else if (fstat(filefd, &st) != -1) 2424 readsize = (ssize_t)st.st_blksize; 2425 else 2426 readsize = BUFSIZ; 2427 if ((buf = malloc(readsize)) == NULL) { 2428 perror_reply(451, "Local resource failure: malloc"); 2429 goto cleanup_recv_data; 2430 } 2431 if (curclass.rateput) { 2432 while (1) { 2433 int d; 2434 struct timeval then, now, td; 2435 off_t bufrem; 2436 2437 (void)gettimeofday(&then, NULL); 2438 errno = c = d = 0; 2439 for (bufrem = curclass.rateput; bufrem > 0; ) { 2440 if ((c = read(netfd, buf, 2441 MIN(readsize, bufrem))) <= 0) 2442 goto recvdone; 2443 if (urgflag && handleoobcmd()) 2444 goto cleanup_recv_data; 2445 FILESIZECHECK(byte_count + c); 2446 if ((d = write(filefd, buf, c)) != c) 2447 goto file_err; 2448 (void) alarm(curclass.timeout); 2449 bufrem -= c; 2450 byte_count += c; 2451 total_data_in += c; 2452 total_data += c; 2453 total_bytes_in += c; 2454 total_bytes += c; 2455 } 2456 (void)gettimeofday(&now, NULL); 2457 timersub(&now, &then, &td); 2458 if (td.tv_sec == 0) 2459 usleep(1000000 - td.tv_usec); 2460 } 2461 } else { 2462 while ((c = read(netfd, buf, readsize)) > 0) { 2463 if (urgflag && handleoobcmd()) 2464 goto cleanup_recv_data; 2465 FILESIZECHECK(byte_count + c); 2466 if (write(filefd, buf, c) != c) 2467 goto file_err; 2468 (void) alarm(curclass.timeout); 2469 byte_count += c; 2470 total_data_in += c; 2471 total_data += c; 2472 total_bytes_in += c; 2473 total_bytes += c; 2474 } 2475 } 2476 recvdone: 2477 if (c < 0) 2478 goto data_err; 2479 rval = 0; 2480 goto cleanup_recv_data; 2481 2482 case TYPE_E: 2483 reply(553, "TYPE E not implemented."); 2484 goto cleanup_recv_data; 2485 2486 case TYPE_A: 2487 (void) alarm(curclass.timeout); 2488 /* XXXLUKEM: rate limit ascii receive (put) */ 2489 while ((c = getc(instr)) != EOF) { 2490 if (urgflag && handleoobcmd()) 2491 goto cleanup_recv_data; 2492 byte_count++; 2493 total_data_in++; 2494 total_data++; 2495 total_bytes_in++; 2496 total_bytes++; 2497 if ((byte_count % 4096) == 0) 2498 (void) alarm(curclass.timeout); 2499 if (c == '\n') 2500 bare_lfs++; 2501 while (c == '\r') { 2502 if (ferror(outstr)) 2503 goto data_err; 2504 if ((c = getc(instr)) != '\n') { 2505 byte_count++; 2506 total_data_in++; 2507 total_data++; 2508 total_bytes_in++; 2509 total_bytes++; 2510 if ((byte_count % 4096) == 0) 2511 (void) alarm(curclass.timeout); 2512 byteswritten++; 2513 FILESIZECHECK(byteswritten); 2514 (void) putc ('\r', outstr); 2515 if (c == '\0' || c == EOF) 2516 goto contin2; 2517 } 2518 } 2519 byteswritten++; 2520 FILESIZECHECK(byteswritten); 2521 (void) putc(c, outstr); 2522 contin2: ; 2523 } 2524 (void) alarm(0); 2525 fflush(outstr); 2526 if (ferror(instr)) 2527 goto data_err; 2528 if (ferror(outstr)) 2529 goto file_err; 2530 if (bare_lfs) { 2531 reply(-226, 2532 "WARNING! %d bare linefeeds received in ASCII mode", 2533 bare_lfs); 2534 reply(0, "File may not have transferred correctly."); 2535 } 2536 rval = 0; 2537 goto cleanup_recv_data; 2538 2539 default: 2540 reply(550, "Unimplemented TYPE %d in receive_data", type); 2541 goto cleanup_recv_data; 2542 } 2543#undef FILESIZECHECK 2544 2545 data_err: 2546 (void) alarm(0); 2547 perror_reply(426, "Data Connection"); 2548 goto cleanup_recv_data; 2549 2550 file_err: 2551 (void) alarm(0); 2552 perror_reply(452, "Error writing file"); 2553 goto cleanup_recv_data; 2554 2555 cleanup_recv_data: 2556 (void) alarm(0); 2557 (void) sigaction(SIGALRM, &sa_saved, NULL); 2558 if (buf) 2559 free(buf); 2560 transflag = 0; 2561 urgflag = 0; 2562 total_files_in++; 2563 total_files++; 2564 total_xfers_in++; 2565 total_xfers++; 2566 return (rval); 2567} 2568 2569void 2570statcmd(void) 2571{ 2572 struct sockinet *su = NULL; 2573 static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 2574 unsigned char *a, *p; 2575 int ispassive, af; 2576 off_t otbi, otbo, otb; 2577 2578 a = p = NULL; 2579 2580 reply(-211, "%s FTP server status:", hostname); 2581 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 2582 hbuf[0] = '\0'; 2583 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 2584 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) 2585 && strcmp(remotehost, hbuf) != 0) 2586 reply(0, "Connected to %s (%s)", remotehost, hbuf); 2587 else 2588 reply(0, "Connected to %s", remotehost); 2589 2590 if (logged_in) { 2591 if (curclass.type == CLASS_GUEST) 2592 reply(0, "Logged in anonymously"); 2593 else 2594 reply(0, "Logged in as %s%s", pw->pw_name, 2595 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 2596 } else if (askpasswd) 2597 reply(0, "Waiting for password"); 2598 else 2599 reply(0, "Waiting for user name"); 2600 cprintf(stdout, " TYPE: %s", typenames[type]); 2601 if (type == TYPE_A || type == TYPE_E) 2602 cprintf(stdout, ", FORM: %s", formnames[form]); 2603 if (type == TYPE_L) { 2604#if NBBY == 8 2605 cprintf(stdout, " %d", NBBY); 2606#else 2607 /* XXX: `bytesize' needs to be defined in this case */ 2608 cprintf(stdout, " %d", bytesize); 2609#endif 2610 } 2611 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 2612 strunames[stru], modenames[mode]); 2613 ispassive = 0; 2614 if (data != -1) { 2615 reply(0, "Data connection open"); 2616 su = NULL; 2617 } else if (pdata != -1) { 2618 reply(0, "in Passive mode"); 2619 if (curclass.advertise.su_len != 0) 2620 su = &curclass.advertise; 2621 else 2622 su = &pasv_addr; 2623 ispassive = 1; 2624 goto printaddr; 2625 } else if (usedefault == 0) { 2626 su = (struct sockinet *)&data_dest; 2627 2628 if (epsvall) { 2629 reply(0, "EPSV only mode (EPSV ALL)"); 2630 goto epsvonly; 2631 } 2632 printaddr: 2633 /* PASV/PORT */ 2634 if (su->su_family == AF_INET) { 2635 a = (unsigned char *) &su->su_addr; 2636 p = (unsigned char *) &su->su_port; 2637#define UC(b) (((int) b) & 0xff) 2638 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 2639 ispassive ? "PASV" : "PORT" , 2640 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2641 UC(p[0]), UC(p[1])); 2642 } 2643 2644 /* LPSV/LPRT */ 2645 { 2646 int alen, i; 2647 2648 alen = 0; 2649 switch (su->su_family) { 2650 case AF_INET: 2651 a = (unsigned char *) &su->su_addr; 2652 p = (unsigned char *) &su->su_port; 2653 alen = sizeof(su->su_addr); 2654 af = 4; 2655 break; 2656#ifdef INET6 2657 case AF_INET6: 2658 a = (unsigned char *) &su->su_6addr; 2659 p = (unsigned char *) &su->su_port; 2660 alen = sizeof(su->su_6addr); 2661 af = 6; 2662 break; 2663#endif 2664 default: 2665 af = 0; 2666 break; 2667 } 2668 if (af) { 2669 cprintf(stdout, " %s (%d,%d", 2670 ispassive ? "LPSV" : "LPRT", af, alen); 2671 for (i = 0; i < alen; i++) 2672 cprintf(stdout, ",%d", UC(a[i])); 2673 cprintf(stdout, ",%d,%d,%d)\r\n", 2674 2, UC(p[0]), UC(p[1])); 2675#undef UC 2676 } 2677 } 2678 2679 /* EPRT/EPSV */ 2680 epsvonly: 2681 af = af2epsvproto(su->su_family); 2682 hbuf[0] = '\0'; 2683 if (af > 0) { 2684 struct sockinet tmp; 2685 2686 tmp = *su; 2687#ifdef INET6 2688 if (tmp.su_family == AF_INET6) 2689 tmp.su_scope_id = 0; 2690#endif 2691 if (getnameinfo((struct sockaddr *)&tmp.si_su, 2692 tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 2693 NI_NUMERICHOST | NI_NUMERICSERV) == 0) 2694 reply(0, "%s (|%d|%s|%s|)", 2695 ispassive ? "EPSV" : "EPRT", 2696 af, hbuf, sbuf); 2697 } 2698 } else 2699 reply(0, "No data connection"); 2700 2701 if (logged_in) { 2702 reply(0, 2703 "Data sent: " LLF " byte%s in " LLF " file%s", 2704 (LLT)total_data_out, PLURAL(total_data_out), 2705 (LLT)total_files_out, PLURAL(total_files_out)); 2706 reply(0, 2707 "Data received: " LLF " byte%s in " LLF " file%s", 2708 (LLT)total_data_in, PLURAL(total_data_in), 2709 (LLT)total_files_in, PLURAL(total_files_in)); 2710 reply(0, 2711 "Total data: " LLF " byte%s in " LLF " file%s", 2712 (LLT)total_data, PLURAL(total_data), 2713 (LLT)total_files, PLURAL(total_files)); 2714 } 2715 otbi = total_bytes_in; 2716 otbo = total_bytes_out; 2717 otb = total_bytes; 2718 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 2719 (LLT)otbo, PLURAL(otbo), 2720 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 2721 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 2722 (LLT)otbi, PLURAL(otbi), 2723 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 2724 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 2725 (LLT)otb, PLURAL(otb), 2726 (LLT)total_xfers, PLURAL(total_xfers)); 2727 2728 if (logged_in && !CURCLASS_FLAGS_ISSET(private)) { 2729 struct ftpconv *cp; 2730 2731 reply(0, "%s", ""); 2732 reply(0, "Class: %s, type: %s", 2733 curclass.classname, CURCLASSTYPE); 2734 reply(0, "Check PORT/LPRT commands: %sabled", 2735 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 2736 if (! EMPTYSTR(curclass.display)) 2737 reply(0, "Display file: %s", curclass.display); 2738 if (! EMPTYSTR(curclass.notify)) 2739 reply(0, "Notify fileglob: %s", curclass.notify); 2740 reply(0, "Idle timeout: " LLF ", maximum timeout: " LLF, 2741 (LLT)curclass.timeout, (LLT)curclass.maxtimeout); 2742 reply(0, "Current connections: %d", connections); 2743 if (curclass.limit == -1) 2744 reply(0, "Maximum connections: unlimited"); 2745 else 2746 reply(0, "Maximum connections: " LLF, 2747 (LLT)curclass.limit); 2748 if (curclass.limitfile) 2749 reply(0, "Connection limit exceeded message file: %s", 2750 conffilename(curclass.limitfile)); 2751 if (! EMPTYSTR(curclass.chroot)) 2752 reply(0, "Chroot format: %s", curclass.chroot); 2753 reply(0, "Deny bad ftpusers(5) quickly: %sabled", 2754 CURCLASS_FLAGS_ISSET(denyquick) ? "en" : "dis"); 2755 if (! EMPTYSTR(curclass.homedir)) 2756 reply(0, "Homedir format: %s", curclass.homedir); 2757 if (curclass.maxfilesize == -1) 2758 reply(0, "Maximum file size: unlimited"); 2759 else 2760 reply(0, "Maximum file size: " LLF, 2761 (LLT)curclass.maxfilesize); 2762 if (! EMPTYSTR(curclass.motd)) 2763 reply(0, "MotD file: %s", conffilename(curclass.motd)); 2764 reply(0, 2765 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2766 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2767 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2768 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2769 reply(0, "Sanitize file names: %sabled", 2770 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2771 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2772 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2773 if (curclass.advertise.su_len != 0) { 2774 char buf[50]; /* big enough for IPv6 address */ 2775 const char *bp; 2776 2777 bp = inet_ntop(curclass.advertise.su_family, 2778 (void *)&curclass.advertise.su_addr, 2779 buf, sizeof(buf)); 2780 if (bp != NULL) 2781 reply(0, "PASV advertise address: %s", bp); 2782 } 2783 if (curclass.portmin && curclass.portmax) 2784 reply(0, "PASV port range: " LLF " - " LLF, 2785 (LLT)curclass.portmin, (LLT)curclass.portmax); 2786 if (curclass.rateget) 2787 reply(0, "Rate get limit: " LLF " bytes/sec", 2788 (LLT)curclass.rateget); 2789 else 2790 reply(0, "Rate get limit: disabled"); 2791 if (curclass.rateput) 2792 reply(0, "Rate put limit: " LLF " bytes/sec", 2793 (LLT)curclass.rateput); 2794 else 2795 reply(0, "Rate put limit: disabled"); 2796 if (curclass.mmapsize) 2797 reply(0, "Mmap size: " LLF, (LLT)curclass.mmapsize); 2798 else 2799 reply(0, "Mmap size: disabled"); 2800 if (curclass.readsize) 2801 reply(0, "Read size: " LLF, (LLT)curclass.readsize); 2802 else 2803 reply(0, "Read size: default"); 2804 if (curclass.writesize) 2805 reply(0, "Write size: " LLF, (LLT)curclass.writesize); 2806 else 2807 reply(0, "Write size: default"); 2808 if (curclass.recvbufsize) 2809 reply(0, "Receive buffer size: " LLF, 2810 (LLT)curclass.recvbufsize); 2811 else 2812 reply(0, "Receive buffer size: default"); 2813 if (curclass.sendbufsize) 2814 reply(0, "Send buffer size: " LLF, 2815 (LLT)curclass.sendbufsize); 2816 else 2817 reply(0, "Send buffer size: default"); 2818 if (curclass.sendlowat) 2819 reply(0, "Send low water mark: " LLF, 2820 (LLT)curclass.sendlowat); 2821 else 2822 reply(0, "Send low water mark: default"); 2823 reply(0, "Umask: %.04o", curclass.umask); 2824 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2825 if (cp->suffix == NULL || cp->types == NULL || 2826 cp->command == NULL) 2827 continue; 2828 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2829 cp->suffix, cp->types, cp->disable, cp->command); 2830 } 2831 } 2832 2833 reply(211, "End of status"); 2834} 2835 2836void 2837fatal(const char *s) 2838{ 2839 2840 reply(451, "Error in server: %s\n", s); 2841 reply(221, "Closing connection due to server error."); 2842 dologout(0); 2843 /* NOTREACHED */ 2844} 2845 2846/* 2847 * reply() -- 2848 * depending on the value of n, display fmt with a trailing CRLF and 2849 * prefix of: 2850 * n < -1 prefix the message with abs(n) + "-" (initial line) 2851 * n == 0 prefix the message with 4 spaces (middle lines) 2852 * n > 0 prefix the message with n + " " (final line) 2853 */ 2854void 2855reply(int n, const char *fmt, ...) 2856{ 2857 char msg[MAXPATHLEN * 2 + 100]; 2858 size_t b; 2859 va_list ap; 2860 2861 if (n == 0) 2862 b = snprintf(msg, sizeof(msg), " "); 2863 else if (n < 0) 2864 b = snprintf(msg, sizeof(msg), "%d-", -n); 2865 else 2866 b = snprintf(msg, sizeof(msg), "%d ", n); 2867 va_start(ap, fmt); 2868 vsnprintf(msg + b, sizeof(msg) - b, fmt, ap); 2869 va_end(ap); 2870 cprintf(stdout, "%s\r\n", msg); 2871 (void)fflush(stdout); 2872 if (ftpd_debug) 2873 syslog(LOG_DEBUG, "<--- %s", msg); 2874} 2875 2876static void 2877logremotehost(struct sockinet *who) 2878{ 2879 2880#if defined(HAVE_SOCKADDR_SNPRINTF) 2881 char abuf[MAXHOSTNAMELEN]; 2882#endif 2883 2884 struct sockaddr *sa = (struct sockaddr *)&who->si_su; 2885 if (getnameinfo(sa, who->su_len, remotehost, sizeof(remotehost), NULL, 2886 0, getnameopts)) 2887 strlcpy(remotehost, "?", sizeof(remotehost)); 2888#if defined(HAVE_SOCKADDR_SNPRINTF) 2889 sockaddr_snprintf(abuf, sizeof(abuf), "%a", sa); 2890 snprintf(remoteloghost, sizeof(remoteloghost), "%s(%s)", remotehost, 2891 abuf); 2892#else 2893 strlcpy(remoteloghost, remotehost, sizeof(remoteloghost)); 2894#endif 2895 2896#if defined(HAVE_SETPROCTITLE) 2897 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2898 setproctitle("%s", proctitle); 2899#endif /* defined(HAVE_SETPROCTITLE) */ 2900 if (logging) 2901 syslog(LOG_INFO, "connection from %s to %s", 2902 remoteloghost, hostname); 2903} 2904 2905/* 2906 * Record logout in wtmp file and exit with supplied status. 2907 * NOTE: because this is called from signal handlers it cannot 2908 * use stdio (or call other functions that use stdio). 2909 */ 2910void 2911dologout(int status) 2912{ 2913 /* 2914 * Prevent reception of SIGURG from resulting in a resumption 2915 * back to the main program loop. 2916 */ 2917 transflag = 0; 2918 logout_utmp(); 2919 if (logged_in) { 2920#ifdef KERBEROS 2921 if (!notickets && krbtkfile_env) 2922 unlink(krbtkfile_env); 2923#endif 2924 } 2925 /* beware of flushing buffers after a SIGPIPE */ 2926 if (xferlogfd != -1) 2927 close(xferlogfd); 2928 _exit(status); 2929} 2930 2931void 2932abor(void) 2933{ 2934 2935 if (!transflag) 2936 return; 2937 tmpline[0] = '\0'; 2938 is_oob = 0; 2939 reply(426, "Transfer aborted. Data connection closed."); 2940 reply(226, "Abort successful"); 2941 transflag = 0; /* flag that the transfer has aborted */ 2942} 2943 2944void 2945statxfer(void) 2946{ 2947 2948 if (!transflag) 2949 return; 2950 tmpline[0] = '\0'; 2951 is_oob = 0; 2952 if (file_size != (off_t) -1) 2953 reply(213, 2954 "Status: " LLF " of " LLF " byte%s transferred", 2955 (LLT)byte_count, (LLT)file_size, 2956 PLURAL(byte_count)); 2957 else 2958 reply(213, "Status: " LLF " byte%s transferred", 2959 (LLT)byte_count, PLURAL(byte_count)); 2960} 2961 2962/* 2963 * Call when urgflag != 0 to handle Out Of Band commands. 2964 * Returns non zero if the OOB command aborted the transfer 2965 * by setting transflag to 0. (c.f., "ABOR"). 2966 */ 2967static int 2968handleoobcmd(void) 2969{ 2970 char *cp; 2971 int ret; 2972 2973 if (!urgflag) 2974 return (0); 2975 urgflag = 0; 2976 /* only process if transfer occurring */ 2977 if (!transflag) 2978 return (0); 2979 cp = tmpline; 2980 ret = get_line(cp, sizeof(tmpline)-1, stdin); 2981 if (ret == -1) { 2982 reply(221, "You could at least say goodbye."); 2983 dologout(0); 2984 } else if (ret == -2) { 2985 /* Ignore truncated command */ 2986 /* XXX: abort xfer with "500 command too long", & return 1 ? */ 2987 return 0; 2988 } 2989 /* 2990 * Manually parse OOB commands, because we can't 2991 * recursively call the yacc parser... 2992 */ 2993 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2994 abor(); 2995 } else if (strcasecmp(cp, "STAT\r\n") == 0) { 2996 statxfer(); 2997 } else { 2998 /* XXX: error with "500 unknown command" ? */ 2999 } 3000 return (transflag == 0); 3001} 3002 3003static int 3004bind_pasv_addr(void) 3005{ 3006 static int passiveport; 3007 int port, len; 3008 3009 len = pasv_addr.su_len; 3010 if (curclass.portmin == 0 && curclass.portmax == 0) { 3011 pasv_addr.su_port = 0; 3012 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 3013 } 3014 3015 if (passiveport == 0) { 3016 srand(getpid()); 3017 passiveport = rand() % (curclass.portmax - curclass.portmin) 3018 + curclass.portmin; 3019 } 3020 3021 port = passiveport; 3022 while (1) { 3023 port++; 3024 if (port > curclass.portmax) 3025 port = curclass.portmin; 3026 else if (port == passiveport) { 3027 errno = EAGAIN; 3028 return (-1); 3029 } 3030 pasv_addr.su_port = htons(port); 3031 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 3032 break; 3033 if (errno != EADDRINUSE) 3034 return (-1); 3035 } 3036 passiveport = port; 3037 return (0); 3038} 3039 3040/* 3041 * Note: a response of 425 is not mentioned as a possible response to 3042 * the PASV command in RFC959. However, it has been blessed as 3043 * a legitimate response by Jon Postel in a telephone conversation 3044 * with Rick Adams on 25 Jan 89. 3045 */ 3046void 3047passive(void) 3048{ 3049 socklen_t len; 3050 int recvbufsize; 3051 char *p, *a; 3052 3053 if (pdata >= 0) 3054 close(pdata); 3055 pdata = socket(AF_INET, SOCK_STREAM, 0); 3056 if (pdata < 0 || !logged_in) { 3057 perror_reply(425, "Can't open passive connection"); 3058 return; 3059 } 3060 pasv_addr = ctrl_addr; 3061 3062 if (bind_pasv_addr() < 0) 3063 goto pasv_error; 3064 len = pasv_addr.su_len; 3065 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 3066 goto pasv_error; 3067 pasv_addr.su_len = len; 3068 if (curclass.recvbufsize) { 3069 recvbufsize = curclass.recvbufsize; 3070 if (setsockopt(pdata, SOL_SOCKET, SO_RCVBUF, &recvbufsize, 3071 sizeof(int)) == -1) 3072 syslog(LOG_WARNING, "setsockopt(SO_RCVBUF, %d): %m", 3073 recvbufsize); 3074 } 3075 if (listen(pdata, 1) < 0) 3076 goto pasv_error; 3077 if (curclass.advertise.su_len != 0) 3078 a = (char *) &curclass.advertise.su_addr; 3079 else 3080 a = (char *) &pasv_addr.su_addr; 3081 p = (char *) &pasv_addr.su_port; 3082 3083#define UC(b) (((int) b) & 0xff) 3084 3085 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 3086 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 3087 return; 3088 3089 pasv_error: 3090 (void) close(pdata); 3091 pdata = -1; 3092 perror_reply(425, "Can't open passive connection"); 3093 return; 3094} 3095 3096/* 3097 * convert protocol identifier to/from AF 3098 */ 3099int 3100lpsvproto2af(int proto) 3101{ 3102 3103 switch (proto) { 3104 case 4: 3105 return AF_INET; 3106#ifdef INET6 3107 case 6: 3108 return AF_INET6; 3109#endif 3110 default: 3111 return -1; 3112 } 3113} 3114 3115int 3116af2lpsvproto(int af) 3117{ 3118 3119 switch (af) { 3120 case AF_INET: 3121 return 4; 3122#ifdef INET6 3123 case AF_INET6: 3124 return 6; 3125#endif 3126 default: 3127 return -1; 3128 } 3129} 3130 3131int 3132epsvproto2af(int proto) 3133{ 3134 3135 switch (proto) { 3136 case 1: 3137 return AF_INET; 3138#ifdef INET6 3139 case 2: 3140 return AF_INET6; 3141#endif 3142 default: 3143 return -1; 3144 } 3145} 3146 3147int 3148af2epsvproto(int af) 3149{ 3150 3151 switch (af) { 3152 case AF_INET: 3153 return 1; 3154#ifdef INET6 3155 case AF_INET6: 3156 return 2; 3157#endif 3158 default: 3159 return -1; 3160 } 3161} 3162 3163/* 3164 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 3165 * 229 Entering Extended Passive Mode (|||port|) 3166 */ 3167void 3168long_passive(const char *cmd, int pf) 3169{ 3170 socklen_t len; 3171 char *p, *a; 3172 3173 if (!logged_in) { 3174 syslog(LOG_NOTICE, "long passive but not logged in"); 3175 reply(503, "Login with USER first."); 3176 return; 3177 } 3178 3179 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 3180 /* 3181 * XXX: only EPRT/EPSV ready clients will understand this 3182 */ 3183 if (strcmp(cmd, "EPSV") != 0) 3184 reply(501, "Network protocol mismatch"); /*XXX*/ 3185 else 3186 epsv_protounsupp("Network protocol mismatch"); 3187 3188 return; 3189 } 3190 3191 if (pdata >= 0) 3192 close(pdata); 3193 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 3194 if (pdata < 0) { 3195 perror_reply(425, "Can't open passive connection"); 3196 return; 3197 } 3198 pasv_addr = ctrl_addr; 3199 if (bind_pasv_addr() < 0) 3200 goto pasv_error; 3201 len = pasv_addr.su_len; 3202 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 3203 goto pasv_error; 3204 pasv_addr.su_len = len; 3205 if (listen(pdata, 1) < 0) 3206 goto pasv_error; 3207 p = (char *) &pasv_addr.su_port; 3208 3209#define UC(b) (((int) b) & 0xff) 3210 3211 if (strcmp(cmd, "LPSV") == 0) { 3212 struct sockinet *advert; 3213 3214 if (curclass.advertise.su_len != 0) 3215 advert = &curclass.advertise; 3216 else 3217 advert = &pasv_addr; 3218 switch (advert->su_family) { 3219 case AF_INET: 3220 a = (char *) &advert->su_addr; 3221 reply(228, 3222 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3223 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3224 2, UC(p[0]), UC(p[1])); 3225 return; 3226#ifdef INET6 3227 case AF_INET6: 3228 a = (char *) &advert->su_6addr; 3229 reply(228, 3230 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3231 6, 16, 3232 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3233 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3234 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3235 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3236 2, UC(p[0]), UC(p[1])); 3237 return; 3238#endif 3239 } 3240#undef UC 3241 } else if (strcmp(cmd, "EPSV") == 0) { 3242 switch (pasv_addr.su_family) { 3243 case AF_INET: 3244#ifdef INET6 3245 case AF_INET6: 3246#endif 3247 reply(229, "Entering Extended Passive Mode (|||%d|)", 3248 ntohs(pasv_addr.su_port)); 3249 return; 3250 } 3251 } else { 3252 /* more proper error code? */ 3253 } 3254 3255 pasv_error: 3256 (void) close(pdata); 3257 pdata = -1; 3258 perror_reply(425, "Can't open passive connection"); 3259 return; 3260} 3261 3262int 3263extended_port(const char *arg) 3264{ 3265 char *tmp = NULL; 3266 char *result[3]; 3267 char *p, *q; 3268 char delim; 3269 struct addrinfo hints; 3270 struct addrinfo *res = NULL; 3271 int i; 3272 unsigned long proto; 3273 3274 tmp = ftpd_strdup(arg); 3275 p = tmp; 3276 delim = p[0]; 3277 p++; 3278 memset(result, 0, sizeof(result)); 3279 for (i = 0; i < 3; i++) { 3280 q = strchr(p, delim); 3281 if (!q || *q != delim) 3282 goto parsefail; 3283 *q++ = '\0'; 3284 result[i] = p; 3285 p = q; 3286 } 3287 3288 /* some more sanity checks */ 3289 errno = 0; 3290 p = NULL; 3291 (void)strtoul(result[2], &p, 10); 3292 if (errno || !*result[2] || *p) 3293 goto parsefail; 3294 errno = 0; 3295 p = NULL; 3296 proto = strtoul(result[0], &p, 10); 3297 if (errno || !*result[0] || *p) 3298 goto protounsupp; 3299 3300 memset(&hints, 0, sizeof(hints)); 3301 hints.ai_family = epsvproto2af((int)proto); 3302 if (hints.ai_family < 0) 3303 goto protounsupp; 3304 hints.ai_socktype = SOCK_STREAM; 3305 hints.ai_flags = AI_NUMERICHOST; 3306 if (getaddrinfo(result[1], result[2], &hints, &res)) 3307 goto parsefail; 3308 if (res->ai_next) 3309 goto parsefail; 3310 if (sizeof(data_dest) < res->ai_addrlen) 3311 goto parsefail; 3312 memcpy(&data_dest.si_su, res->ai_addr, res->ai_addrlen); 3313 data_dest.su_len = res->ai_addrlen; 3314#ifdef INET6 3315 if (his_addr.su_family == AF_INET6 && 3316 data_dest.su_family == AF_INET6) { 3317 /* XXX: more sanity checks! */ 3318 data_dest.su_scope_id = his_addr.su_scope_id; 3319 } 3320#endif 3321 3322 if (tmp != NULL) 3323 free(tmp); 3324 if (res) 3325 freeaddrinfo(res); 3326 return 0; 3327 3328 parsefail: 3329 reply(500, "Invalid argument, rejected."); 3330 usedefault = 1; 3331 if (tmp != NULL) 3332 free(tmp); 3333 if (res) 3334 freeaddrinfo(res); 3335 return -1; 3336 3337 protounsupp: 3338 epsv_protounsupp("Protocol not supported"); 3339 usedefault = 1; 3340 if (tmp != NULL) 3341 free(tmp); 3342 return -1; 3343} 3344 3345/* 3346 * 522 Protocol not supported (proto,...) 3347 * as we assume address family for control and data connections are the same, 3348 * we do not return the list of address families we support - instead, we 3349 * return the address family of the control connection. 3350 */ 3351void 3352epsv_protounsupp(const char *message) 3353{ 3354 int proto; 3355 3356 proto = af2epsvproto(ctrl_addr.su_family); 3357 if (proto < 0) 3358 reply(501, "%s", message); /* XXX */ 3359 else 3360 reply(522, "%s, use (%d)", message, proto); 3361} 3362 3363/* 3364 * Generate unique name for file with basename "local". 3365 * The file named "local" is already known to exist. 3366 * Generates failure reply on error. 3367 * 3368 * XXX: this function should under go changes similar to 3369 * the mktemp(3)/mkstemp(3) changes. 3370 */ 3371static char * 3372gunique(const char *local) 3373{ 3374 static char new[MAXPATHLEN]; 3375 struct stat st; 3376 char *cp; 3377 int count; 3378 3379 cp = strrchr(local, '/'); 3380 if (cp) 3381 *cp = '\0'; 3382 if (stat(cp ? local : ".", &st) < 0) { 3383 perror_reply(553, cp ? local : "."); 3384 return (NULL); 3385 } 3386 if (cp) 3387 *cp = '/'; 3388 for (count = 1; count < 100; count++) { 3389 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 3390 if (stat(new, &st) < 0) 3391 return (new); 3392 } 3393 reply(452, "Unique file name cannot be created."); 3394 return (NULL); 3395} 3396 3397/* 3398 * Format and send reply containing system error number. 3399 */ 3400void 3401perror_reply(int code, const char *string) 3402{ 3403 int save_errno; 3404 3405 save_errno = errno; 3406 reply(code, "%s: %s.", string, strerror(errno)); 3407 errno = save_errno; 3408} 3409 3410static char *onefile[] = { 3411 NULL, 3412 0 3413}; 3414 3415void 3416send_file_list(const char *whichf) 3417{ 3418 struct stat st; 3419 DIR *dirp; 3420 struct dirent *dir; 3421 FILE *volatile dout; 3422 char **volatile dirlist; 3423 char *dirname, *p; 3424 char *notglob; 3425 int volatile simple; 3426 int volatile freeglob; 3427 glob_t gl; 3428 3429 dirp = NULL; 3430 dout = NULL; 3431 notglob = NULL; 3432 simple = 0; 3433 freeglob = 0; 3434 urgflag = 0; 3435 3436 p = NULL; 3437 if (strpbrk(whichf, "~{[*?") != NULL) { 3438 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; 3439 3440 memset(&gl, 0, sizeof(gl)); 3441 freeglob = 1; 3442 if (glob(whichf, flags, 0, &gl)) { 3443 reply(450, "Not found"); 3444 goto cleanup_send_file_list; 3445 } else if (gl.gl_pathc == 0) { 3446 errno = ENOENT; 3447 perror_reply(450, whichf); 3448 goto cleanup_send_file_list; 3449 } 3450 dirlist = gl.gl_pathv; 3451 } else { 3452 notglob = ftpd_strdup(whichf); 3453 onefile[0] = notglob; 3454 dirlist = onefile; 3455 simple = 1; 3456 } 3457 /* XXX: } for vi sm */ 3458 3459 while ((dirname = *dirlist++) != NULL) { 3460 int trailingslash = 0; 3461 3462 if (stat(dirname, &st) < 0) { 3463 /* 3464 * If user typed "ls -l", etc, and the client 3465 * used NLST, do what the user meant. 3466 */ 3467 /* XXX: nuke this support? */ 3468 if (dirname[0] == '-' && *dirlist == NULL && 3469 transflag == 0) { 3470 const char *argv[] = { INTERNAL_LS, "", NULL }; 3471 3472 argv[1] = dirname; 3473 retrieve(argv, dirname); 3474 goto cleanup_send_file_list; 3475 } 3476 perror_reply(450, whichf); 3477 goto cleanup_send_file_list; 3478 } 3479 3480 if (S_ISREG(st.st_mode)) { 3481 /* 3482 * XXXRFC: 3483 * should we follow RFC959 and not work 3484 * for non directories? 3485 */ 3486 if (dout == NULL) { 3487 dout = dataconn("file list", (off_t)-1, "w"); 3488 if (dout == NULL) 3489 goto cleanup_send_file_list; 3490 transflag = 1; 3491 } 3492 cprintf(dout, "%s%s\n", dirname, 3493 type == TYPE_A ? "\r" : ""); 3494 continue; 3495 } else if (!S_ISDIR(st.st_mode)) 3496 continue; 3497 3498 if (dirname[strlen(dirname) - 1] == '/') 3499 trailingslash++; 3500 3501 if ((dirp = opendir(dirname)) == NULL) 3502 continue; 3503 3504 while ((dir = readdir(dirp)) != NULL) { 3505 char nbuf[MAXPATHLEN]; 3506 3507 if (urgflag && handleoobcmd()) { 3508 (void) closedir(dirp); 3509 goto cleanup_send_file_list; 3510 } 3511 3512 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 3513 continue; 3514 3515 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 3516 trailingslash ? "" : "/", dir->d_name); 3517 3518 /* 3519 * We have to do a stat to ensure it's 3520 * not a directory or special file. 3521 */ 3522 /* 3523 * XXXRFC: 3524 * should we follow RFC959 and filter out 3525 * non files ? lukem - NO!, or not until 3526 * our ftp client uses MLS{T,D} for completion. 3527 */ 3528 if (simple || (stat(nbuf, &st) == 0 && 3529 S_ISREG(st.st_mode))) { 3530 if (dout == NULL) { 3531 dout = dataconn("file list", (off_t)-1, 3532 "w"); 3533 if (dout == NULL) { 3534 (void) closedir(dirp); 3535 goto cleanup_send_file_list; 3536 } 3537 transflag = 1; 3538 } 3539 p = nbuf; 3540 if (nbuf[0] == '.' && nbuf[1] == '/') 3541 p = &nbuf[2]; 3542 cprintf(dout, "%s%s\n", p, 3543 type == TYPE_A ? "\r" : ""); 3544 } 3545 } 3546 (void) closedir(dirp); 3547 } 3548 3549 if (dout == NULL) 3550 reply(450, "No files found."); 3551 else if (ferror(dout) != 0) 3552 perror_reply(451, "Data connection"); 3553 else 3554 reply(226, "Transfer complete."); 3555 3556 cleanup_send_file_list: 3557 closedataconn(dout); 3558 transflag = 0; 3559 urgflag = 0; 3560 total_xfers++; 3561 total_xfers_out++; 3562 if (notglob) 3563 free(notglob); 3564 if (freeglob) 3565 globfree(&gl); 3566} 3567 3568char * 3569conffilename(const char *s) 3570{ 3571 static char filename[MAXPATHLEN]; 3572 3573 if (*s == '/') 3574 strlcpy(filename, s, sizeof(filename)); 3575 else 3576 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 3577 return (filename); 3578} 3579 3580/* 3581 * logxfer -- 3582 * if logging > 1, then based on the arguments, syslog a message: 3583 * if bytes != -1 "<command> <file1> = <bytes> bytes" 3584 * else if file2 != NULL "<command> <file1> <file2>" 3585 * else "<command> <file1>" 3586 * if elapsed != NULL, append "in xxx.yyy seconds" 3587 * if error != NULL, append ": " + error 3588 * 3589 * if doxferlog != 0, bytes != -1, and command is "get", "put", 3590 * or "append", syslog and/or write a wu-ftpd style xferlog entry 3591 */ 3592void 3593logxfer(const char *command, off_t bytes, const char *file1, const char *file2, 3594 const struct timeval *elapsed, const char *error) 3595{ 3596 char buf[MAXPATHLEN * 2 + 100]; 3597 char realfile1[MAXPATHLEN], realfile2[MAXPATHLEN]; 3598 const char *r1, *r2; 3599 char direction; 3600 size_t len; 3601 time_t now; 3602 3603 if (logging <=1 && !doxferlog) 3604 return; 3605 3606 r1 = r2 = NULL; 3607 if ((r1 = realpath(file1, realfile1)) == NULL) 3608 r1 = file1; 3609 if (file2 != NULL) 3610 if ((r2 = realpath(file2, realfile2)) == NULL) 3611 r2 = file2; 3612 3613 /* 3614 * syslog command 3615 */ 3616 if (logging > 1) { 3617 len = snprintf(buf, sizeof(buf), "%s %s", command, r1); 3618 if (bytes != (off_t)-1) 3619 len += snprintf(buf + len, sizeof(buf) - len, 3620 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 3621 else if (r2 != NULL) 3622 len += snprintf(buf + len, sizeof(buf) - len, 3623 " %s", r2); 3624 if (elapsed != NULL) 3625 len += snprintf(buf + len, sizeof(buf) - len, 3626 " in " LLF ".%.03ld seconds", 3627 (LLT)elapsed->tv_sec, 3628 (long)(elapsed->tv_usec / 1000)); 3629 if (error != NULL) 3630 len += snprintf(buf + len, sizeof(buf) - len, 3631 ": %s", error); 3632 syslog(LOG_INFO, "%s", buf); 3633 } 3634 3635 /* 3636 * syslog wu-ftpd style log entry, prefixed with "xferlog: " 3637 */ 3638 if (!doxferlog || bytes == -1) 3639 return; 3640 3641 if (strcmp(command, "get") == 0) 3642 direction = 'o'; 3643 else if (strcmp(command, "put") == 0 || strcmp(command, "append") == 0) 3644 direction = 'i'; 3645 else 3646 return; 3647 3648 time(&now); 3649 len = snprintf(buf, sizeof(buf), 3650 "%.24s " LLF " %s " LLF " %s %c %s %c %c %s FTP 0 * %c\n", 3651 3652/* 3653 * XXX: wu-ftpd puts ' (send)' or ' (recv)' in the syslog message, and removes 3654 * the full date. This may be problematic for accurate log parsing, 3655 * given that syslog messages don't contain the full date. 3656 */ 3657 ctime(&now), 3658 (LLT) 3659 (elapsed == NULL ? 0 : elapsed->tv_sec + (elapsed->tv_usec > 0)), 3660 remotehost, 3661 (LLT) bytes, 3662 r1, 3663 type == TYPE_A ? 'a' : 'b', 3664 "_", /* XXX: take conversions into account? */ 3665 direction, 3666 3667 curclass.type == CLASS_GUEST ? 'a' : 3668 curclass.type == CLASS_CHROOT ? 'g' : 3669 curclass.type == CLASS_REAL ? 'r' : '?', 3670 3671 curclass.type == CLASS_GUEST ? pw->pw_passwd : pw->pw_name, 3672 error != NULL ? 'i' : 'c' 3673 ); 3674 3675 if ((doxferlog & 2) && xferlogfd != -1) 3676 write(xferlogfd, buf, len); 3677 if ((doxferlog & 1)) { 3678 buf[len-1] = '\n'; /* strip \n from syslog message */ 3679 syslog(LOG_INFO, "xferlog: %s", buf); 3680 } 3681} 3682 3683/* 3684 * Log the resource usage. 3685 * 3686 * XXX: more resource usage to logging? 3687 */ 3688void 3689logrusage(const struct rusage *rusage_before, 3690 const struct rusage *rusage_after) 3691{ 3692 struct timeval usrtime, systime; 3693 3694 if (logging <= 1) 3695 return; 3696 3697 timersub(&rusage_after->ru_utime, &rusage_before->ru_utime, &usrtime); 3698 timersub(&rusage_after->ru_stime, &rusage_before->ru_stime, &systime); 3699 syslog(LOG_INFO, LLF ".%.03ldu " LLF ".%.03lds %ld+%ldio %ldpf+%ldw", 3700 (LLT)usrtime.tv_sec, (long)(usrtime.tv_usec / 1000), 3701 (LLT)systime.tv_sec, (long)(systime.tv_usec / 1000), 3702 rusage_after->ru_inblock - rusage_before->ru_inblock, 3703 rusage_after->ru_oublock - rusage_before->ru_oublock, 3704 rusage_after->ru_majflt - rusage_before->ru_majflt, 3705 rusage_after->ru_nswap - rusage_before->ru_nswap); 3706} 3707 3708/* 3709 * Determine if `password' is valid for user given in `pw'. 3710 * Returns 2 if password expired, 1 if otherwise failed, 0 if ok 3711 */ 3712int 3713checkpassword(const struct passwd *pwent, const char *password) 3714{ 3715 const char *orig; 3716 char *new; 3717 time_t change, expire, now; 3718 3719 change = expire = 0; 3720 if (pwent == NULL) 3721 return 1; 3722 3723 time(&now); 3724 orig = pwent->pw_passwd; /* save existing password */ 3725 expire = pwent->pw_expire; 3726 change = pwent->pw_change; 3727 if (change == _PASSWORD_CHGNOW) 3728 change = now; 3729 3730 if (orig[0] == '\0') /* don't allow empty passwords */ 3731 return 1; 3732 3733 new = crypt(password, orig); /* encrypt given password */ 3734 if (strcmp(new, orig) != 0) /* compare */ 3735 return 1; 3736 3737 if ((expire && now >= expire) || (change && now >= change)) 3738 return 2; /* check if expired */ 3739 3740 return 0; /* OK! */ 3741} 3742 3743char * 3744ftpd_strdup(const char *s) 3745{ 3746 char *new = strdup(s); 3747 3748 if (new == NULL) 3749 fatal("Local resource failure: malloc"); 3750 /* NOTREACHED */ 3751 return (new); 3752} 3753 3754/* 3755 * As per fprintf(), but increment total_bytes and total_bytes_out, 3756 * by the appropriate amount. 3757 */ 3758void 3759cprintf(FILE *fd, const char *fmt, ...) 3760{ 3761 off_t b; 3762 va_list ap; 3763 3764 va_start(ap, fmt); 3765 b = vfprintf(fd, fmt, ap); 3766 va_end(ap); 3767 total_bytes += b; 3768 total_bytes_out += b; 3769} 3770 3771#ifdef USE_PAM 3772/* 3773 * the following code is stolen from imap-uw PAM authentication module and 3774 * login.c 3775 */ 3776typedef struct { 3777 const char *uname; /* user name */ 3778 int triedonce; /* if non-zero, tried before */ 3779} ftpd_cred_t; 3780 3781static int 3782auth_conv(int num_msg, const struct pam_message **msg, 3783 struct pam_response **resp, void *appdata) 3784{ 3785 int i, ret; 3786 size_t n; 3787 ftpd_cred_t *cred = (ftpd_cred_t *) appdata; 3788 struct pam_response *myreply; 3789 char pbuf[FTP_BUFLEN]; 3790 3791 if (num_msg <= 0 || num_msg > PAM_MAX_NUM_MSG) 3792 return (PAM_CONV_ERR); 3793 myreply = calloc(num_msg, sizeof *myreply); 3794 if (myreply == NULL) 3795 return PAM_BUF_ERR; 3796 3797 for (i = 0; i < num_msg; i++) { 3798 myreply[i].resp_retcode = 0; 3799 myreply[i].resp = NULL; 3800 switch (msg[i]->msg_style) { 3801 case PAM_PROMPT_ECHO_ON: /* user */ 3802 myreply[i].resp = ftpd_strdup(cred->uname); 3803 /* PAM frees resp. */ 3804 break; 3805 case PAM_PROMPT_ECHO_OFF: /* authtok (password) */ 3806 /* 3807 * Only send a single 331 reply and 3808 * then expect a PASS. 3809 */ 3810 if (cred->triedonce) { 3811 syslog(LOG_ERR, 3812 "auth_conv: already performed PAM_PROMPT_ECHO_OFF"); 3813 goto fail; 3814 } 3815 cred->triedonce++; 3816 if (msg[i]->msg[0] == '\0') { 3817 (void)strlcpy(pbuf, "password", sizeof(pbuf)); 3818 } else { 3819 /* Uncapitalize msg */ 3820 (void)strlcpy(pbuf, msg[i]->msg, sizeof(pbuf)); 3821 if (isupper((unsigned char)pbuf[0])) 3822 pbuf[0] = tolower( 3823 (unsigned char)pbuf[0]); 3824 /* Remove trailing ':' and whitespace */ 3825 n = strlen(pbuf); 3826 while (n-- > 0) { 3827 if (isspace((unsigned char)pbuf[n]) || 3828 pbuf[n] == ':') 3829 pbuf[n] = '\0'; 3830 else 3831 break; 3832 } 3833 } 3834 /* Send reply, wait for a response. */ 3835 reply(331, "User %s accepted, provide %s.", 3836 cred->uname, pbuf); 3837 (void) alarm(curclass.timeout); 3838 ret = get_line(pbuf, sizeof(pbuf)-1, stdin); 3839 (void) alarm(0); 3840 if (ret == -1) { 3841 reply(221, "You could at least say goodbye."); 3842 dologout(0); 3843 } else if (ret == -2) { 3844 /* XXX: should we do this reply(-530, ..) ? */ 3845 reply(-530, "Command too long."); 3846 goto fail; 3847 } 3848 /* Ensure it is PASS */ 3849 if (strncasecmp(pbuf, "PASS ", 5) != 0) { 3850 syslog(LOG_ERR, 3851 "auth_conv: unexpected reply '%.4s'", pbuf); 3852 /* XXX: should we do this reply(-530, ..) ? */ 3853 reply(-530, "Unexpected reply '%.4s'.", pbuf); 3854 goto fail; 3855 } 3856 /* Strip CRLF from "PASS" reply */ 3857 n = strlen(pbuf); 3858 while (--n >= 5 && 3859 (pbuf[n] == '\r' || pbuf[n] == '\n')) 3860 pbuf[n] = '\0'; 3861 /* Copy password into reply */ 3862 myreply[i].resp = ftpd_strdup(pbuf+5); 3863 /* PAM frees resp. */ 3864 break; 3865 case PAM_TEXT_INFO: 3866 case PAM_ERROR_MSG: 3867 break; 3868 default: /* unknown message style */ 3869 goto fail; 3870 } 3871 } 3872 3873 *resp = myreply; 3874 return PAM_SUCCESS; 3875 3876 fail: 3877 free(myreply); 3878 *resp = NULL; 3879 return PAM_CONV_ERR; 3880} 3881 3882/* 3883 * Attempt to authenticate the user using PAM. Returns 0 if the user is 3884 * authenticated, or 1 if not authenticated. If some sort of PAM system 3885 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 3886 * function returns -1. This can be used as an indication that we should 3887 * fall back to a different authentication mechanism. 3888 * pw maybe be updated to a new user if PAM_USER changes from curname. 3889 */ 3890static int 3891auth_pam(void) 3892{ 3893 const char *tmpl_user; 3894 const void *item; 3895 int rval; 3896 int e; 3897 ftpd_cred_t auth_cred = { curname, 0 }; 3898 struct pam_conv conv = { &auth_conv, &auth_cred }; 3899 struct sockaddr_storage ss; 3900 3901 e = pam_start("ftpd", curname, &conv, &pamh); 3902 if (e != PAM_SUCCESS) { 3903 /* 3904 * In OpenPAM, it's OK to pass NULL to pam_strerror() 3905 * if context creation has failed in the first place. 3906 */ 3907 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 3908 return -1; 3909 } 3910 3911 e = pam_set_item(pamh, PAM_RHOST, remotehost); 3912 if (e != PAM_SUCCESS) { 3913 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 3914 pam_strerror(pamh, e)); 3915 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3916 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3917 } 3918 pamh = NULL; 3919 return -1; 3920 } 3921 3922 memset(&ss, 0, sizeof(ss)); 3923 memcpy(&ss, &his_addr.si_su, his_addr.su_len); 3924 e = pam_set_item(pamh, PAM_SOCKADDR, &ss); 3925 if (e != PAM_SUCCESS) { 3926 syslog(LOG_ERR, "pam_set_item(PAM_SOCKADDR): %s", 3927 pam_strerror(pamh, e)); 3928 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3929 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3930 } 3931 pamh = NULL; 3932 return -1; 3933 } 3934 3935 e = pam_authenticate(pamh, 0); 3936 if (ftpd_debug) 3937 syslog(LOG_DEBUG, "pam_authenticate: user '%s' returned %d", 3938 curname, e); 3939 switch (e) { 3940 case PAM_SUCCESS: 3941 /* 3942 * With PAM we support the concept of a "template" 3943 * user. The user enters a login name which is 3944 * authenticated by PAM, usually via a remote service 3945 * such as RADIUS or TACACS+. If authentication 3946 * succeeds, a different but related "template" name 3947 * is used for setting the credentials, shell, and 3948 * home directory. The name the user enters need only 3949 * exist on the remote authentication server, but the 3950 * template name must be present in the local password 3951 * database. 3952 * 3953 * This is supported by two various mechanisms in the 3954 * individual modules. However, from the application's 3955 * point of view, the template user is always passed 3956 * back as a changed value of the PAM_USER item. 3957 */ 3958 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 3959 PAM_SUCCESS) { 3960 tmpl_user = (const char *) item; 3961 if (pw == NULL 3962 || strcmp(pw->pw_name, tmpl_user) != 0) { 3963 pw = sgetpwnam(tmpl_user); 3964 if (ftpd_debug) 3965 syslog(LOG_DEBUG, 3966 "auth_pam: PAM changed " 3967 "user from '%s' to '%s'", 3968 curname, pw->pw_name); 3969 (void)strlcpy(curname, pw->pw_name, 3970 curname_len); 3971 } 3972 } else 3973 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 3974 pam_strerror(pamh, e)); 3975 rval = 0; 3976 break; 3977 3978 case PAM_AUTH_ERR: 3979 case PAM_USER_UNKNOWN: 3980 case PAM_MAXTRIES: 3981 rval = 1; 3982 break; 3983 3984 default: 3985 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 3986 rval = -1; 3987 break; 3988 } 3989 3990 if (rval == 0) { 3991 e = pam_acct_mgmt(pamh, 0); 3992 if (e != PAM_SUCCESS) { 3993 syslog(LOG_ERR, "pam_acct_mgmt: %s", 3994 pam_strerror(pamh, e)); 3995 rval = 1; 3996 } 3997 } 3998 3999 if (rval != 0) { 4000 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 4001 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 4002 } 4003 pamh = NULL; 4004 } 4005 return rval; 4006} 4007 4008#endif /* USE_PAM */ 4009