1 /* $NetBSD: ftpd.c,v 1.211 2025/06/27 21:36:23 andvar 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 98 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 99 #else 100 __RCSID("$NetBSD: ftpd.c,v 1.211 2025/06/27 21:36:23 andvar 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" 174 175 static sig_atomic_t transflag; 176 static sig_atomic_t urgflag; 177 178 int data; 179 int Dflag; 180 int fflag; 181 int sflag; 182 int stru; /* avoid C keyword */ 183 int mode; 184 int dataport; /* use specific data port */ 185 int dopidfile; /* maintain pid file */ 186 int doutmp; /* update utmp file */ 187 int dowtmp; /* update wtmp file */ 188 int doxferlog; /* syslog/write wu-ftpd style xferlog entries */ 189 int xferlogfd; /* fd to write wu-ftpd xferlog entries to */ 190 int getnameopts; /* flags for use with getname() */ 191 int dropprivs; /* if privileges should or have been dropped */ 192 int mapped; /* IPv4 connection on AF_INET6 socket */ 193 off_t file_size; 194 off_t byte_count; 195 static char ttyline[20]; 196 197 #ifdef USE_PAM 198 static int auth_pam(void); 199 pam_handle_t *pamh = NULL; 200 #endif 201 202 #ifdef SUPPORT_UTMP 203 static struct utmp utmp; /* for utmp */ 204 #endif 205 #ifdef SUPPORT_UTMPX 206 static struct utmpx utmpx; /* for utmpx */ 207 #endif 208 209 static const char *anondir = NULL; 210 static const char *confdir = _DEFAULT_CONFDIR; 211 212 static char *curname; /* current USER name */ 213 static size_t curname_len; /* length of curname (include NUL) */ 214 215 #if defined(KERBEROS) || defined(KERBEROS5) 216 int has_ccache = 0; 217 int notickets = 1; 218 char *krbtkfile_env = NULL; 219 char *tty = ttyline; 220 int login_krb5_forwardable_tgt = 0; 221 #endif 222 223 int 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 */ 232 233 int swaitmax = SWAITMAX; 234 int swaitint = SWAITINT; 235 236 enum 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 }; 243 244 static int bind_pasv_addr(void); 245 static int checkuser(const char *, const char *, int, int, char **); 246 static int checkaccess(const char *); 247 static int checkpassword(const struct passwd *, const char *); 248 static void do_pass(int, int, const char *); 249 static void end_login(void); 250 static FILE *getdatasock(const char *); 251 static char *gunique(const char *); 252 static void login_utmp(const char *, const char *, const char *, 253 struct sockinet *); 254 static void logremotehost(struct sockinet *); 255 __dead static void lostconn(int); 256 __dead static void toolong(int); 257 __dead static void sigquit(int); 258 static void sigurg(int); 259 static int handleoobcmd(void); 260 static int receive_data(FILE *, FILE *); 261 static int send_data(FILE *, FILE *, const struct stat *, int); 262 static struct passwd *sgetpwnam(const char *); 263 static int write_data(int, char *, size_t, off_t *, struct timeval *, 264 int); 265 static enum send_status 266 send_data_with_read(int, int, const struct stat *, int); 267 static enum send_status 268 send_data_with_mmap(int, int, const struct stat *, int); 269 static void logrusage(const struct rusage *, const struct rusage *); 270 static void logout_utmp(void); 271 272 int main(int, char *[]); 273 274 #if defined(KERBEROS) 275 int klogin(struct passwd *, char *, char *, char *); 276 void kdestroy(void); 277 #endif 278 #if defined(KERBEROS5) 279 int k5login(struct passwd *, char *, char *, char *); 280 void k5destroy(void); 281 #endif 282 283 int 284 main(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 } 780 781 static void 782 lostconn(int signo __unused) 783 { 784 785 if (ftpd_debug) 786 syslog(LOG_DEBUG, "lost connection"); 787 dologout(1); 788 } 789 790 static void 791 toolong(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 } 803 804 static void 805 sigquit(int signo) 806 { 807 808 if (ftpd_debug) 809 syslog(LOG_DEBUG, "got signal %d", signo); 810 dologout(1); 811 } 812 813 static void 814 sigurg(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 */ 826 static struct passwd * 827 sgetpwnam(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 } 850 851 static int login_attempts; /* number of failed login attempts */ 852 static int askpasswd; /* had USER command, ask for PASSwd */ 853 static 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 */ 866 void 867 user(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 */ 1061 static int 1062 checkuser(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 */ 1209 static int 1210 checkaccess(const char *name) 1211 { 1212 1213 return (checkuser(_NAME_FTPUSERS, name, 1, 0, NULL)); 1214 } 1215 1216 static void 1217 login_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 1257 static void 1258 logout_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 */ 1286 static void 1287 end_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 1328 void 1329 pass(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 */ 1344 static void 1345 do_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 } else 1436 pfilter_notify(0, "success"); 1437 } 1438 1439 /* password ok; check if anything else prevents login */ 1440 if (! permitted) { 1441 reply(530, "User %s may not use FTP.", pw->pw_name); 1442 if (logging) 1443 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 1444 remoteloghost, pw->pw_name); 1445 goto bad; 1446 } 1447 1448 login_attempts = 0; /* this time successful */ 1449 if (setegid((gid_t)pw->pw_gid) < 0) { 1450 syslog(LOG_NOTICE, "user %s: can't setegid: %m", pw->pw_name); 1451 fatal("Can't drop privileges."); 1452 } 1453 #ifdef LOGIN_CAP 1454 if ((lc = login_getpwclass(pw)) != NULL) { 1455 #ifdef notyet 1456 char remote_ip[NI_MAXHOST]; 1457 1458 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1459 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1460 NI_NUMERICHOST)) 1461 *remote_ip = 0; 1462 remote_ip[sizeof(remote_ip) - 1] = 0; 1463 if (!auth_hostok(lc, remotehost, remote_ip)) { 1464 pfilter_notify(1, "bannedhost"); 1465 syslog(LOG_INFO|LOG_AUTH, 1466 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1467 pw->pw_name); 1468 reply(530, "Permission denied."); 1469 pw = NULL; 1470 return; 1471 } 1472 if (!auth_timeok(lc, time(NULL))) { 1473 reply(530, "Login not available right now."); 1474 pw = NULL; 1475 return; 1476 } 1477 #endif 1478 } 1479 setsid(); 1480 setusercontext(lc, pw, 0, 1481 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1482 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1483 #else 1484 (void) initgroups(pw->pw_name, pw->pw_gid); 1485 /* cache groups for cmds.c::matchgroup() */ 1486 #endif 1487 #ifdef USE_PAM 1488 if (pamh) { 1489 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1490 syslog(LOG_ERR, "pam_open_session: %s", 1491 pam_strerror(pamh, e)); 1492 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) 1493 != PAM_SUCCESS) { 1494 syslog(LOG_ERR, "pam_setcred: %s", 1495 pam_strerror(pamh, e)); 1496 } 1497 } 1498 #endif 1499 gidcount = getgroups(0, NULL); 1500 if (gidlist) 1501 free(gidlist); 1502 gidlist = malloc(gidcount * sizeof *gidlist); 1503 gidcount = getgroups(gidcount, gidlist); 1504 1505 /* open utmp/wtmp before chroot */ 1506 login_utmp(ttyline, pw->pw_name, remotehost, &his_addr); 1507 1508 logged_in = 1; 1509 1510 connections = 1; 1511 if (dopidfile) 1512 count_users(); 1513 if (curclass.limit != -1 && connections > curclass.limit) { 1514 if (! EMPTYSTR(curclass.limitfile)) 1515 (void)display_file(conffilename(curclass.limitfile), 1516 530); 1517 reply(530, 1518 "User %s access denied, connection limit of " LLF 1519 " reached.", 1520 pw->pw_name, (LLT)curclass.limit); 1521 syslog(LOG_NOTICE, 1522 "Maximum connection limit of " LLF 1523 " for class %s reached, login refused for %s", 1524 (LLT)curclass.limit, curclass.classname, pw->pw_name); 1525 goto bad; 1526 } 1527 1528 homedir[0] = '/'; 1529 switch (curclass.type) { 1530 case CLASS_GUEST: 1531 /* 1532 * We MUST do a chdir() after the chroot. Otherwise 1533 * the old current directory will be accessible as "." 1534 * outside the new root! 1535 */ 1536 format_path(root, 1537 curclass.chroot ? curclass.chroot : 1538 anondir ? anondir : 1539 pw->pw_dir); 1540 format_path(homedir, 1541 curclass.homedir ? curclass.homedir : 1542 "/"); 1543 if (EMPTYSTR(homedir)) 1544 homedir[0] = '/'; 1545 if (EMPTYSTR(root) || chroot(root) < 0) { 1546 syslog(LOG_NOTICE, 1547 "GUEST user %s: can't chroot to %s: %m", 1548 pw->pw_name, root); 1549 goto bad_guest; 1550 } 1551 if (chdir(homedir) < 0) { 1552 syslog(LOG_NOTICE, 1553 "GUEST user %s: can't chdir to %s: %m", 1554 pw->pw_name, homedir); 1555 bad_guest: 1556 fatal("Can't set guest privileges."); 1557 } 1558 break; 1559 case CLASS_CHROOT: 1560 format_path(root, 1561 curclass.chroot ? curclass.chroot : 1562 pw->pw_dir); 1563 format_path(homedir, 1564 curclass.homedir ? curclass.homedir : 1565 "/"); 1566 if (EMPTYSTR(homedir)) 1567 homedir[0] = '/'; 1568 if (EMPTYSTR(root) || chroot(root) < 0) { 1569 syslog(LOG_NOTICE, 1570 "CHROOT user %s: can't chroot to %s: %m", 1571 pw->pw_name, root); 1572 goto bad_chroot; 1573 } 1574 if (chdir(homedir) < 0) { 1575 syslog(LOG_NOTICE, 1576 "CHROOT user %s: can't chdir to %s: %m", 1577 pw->pw_name, homedir); 1578 bad_chroot: 1579 fatal("Can't change root."); 1580 } 1581 break; 1582 case CLASS_REAL: 1583 /* only chroot REAL if explicitly requested */ 1584 if (! EMPTYSTR(curclass.chroot)) { 1585 format_path(root, curclass.chroot); 1586 if (EMPTYSTR(root) || chroot(root) < 0) { 1587 syslog(LOG_NOTICE, 1588 "REAL user %s: can't chroot to %s: %m", 1589 pw->pw_name, root); 1590 goto bad_chroot; 1591 } 1592 } 1593 format_path(homedir, 1594 curclass.homedir ? curclass.homedir : 1595 pw->pw_dir); 1596 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1597 if (chdir("/") < 0) { 1598 syslog(LOG_NOTICE, 1599 "REAL user %s: can't chdir to %s: %m", 1600 pw->pw_name, 1601 !EMPTYSTR(homedir) ? homedir : "/"); 1602 reply(530, 1603 "User %s: can't change directory to %s.", 1604 pw->pw_name, 1605 !EMPTYSTR(homedir) ? homedir : "/"); 1606 goto bad; 1607 } else { 1608 reply(-230, 1609 "No directory! Logging in with home=/"); 1610 homedir[0] = '/'; 1611 } 1612 } 1613 break; 1614 } 1615 #ifndef LOGIN_CAP 1616 setsid(); 1617 setlogin(pw->pw_name); 1618 #endif 1619 if (dropprivs || 1620 (curclass.type != CLASS_REAL && 1621 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1622 dropprivs++; 1623 if (setgid((gid_t)pw->pw_gid) < 0) { 1624 syslog(LOG_NOTICE, "user %s: can't setgid: %m", pw->pw_name); 1625 fatal("Can't drop privileges."); 1626 } 1627 if (setuid((uid_t)pw->pw_uid) < 0) { 1628 syslog(LOG_NOTICE, "user %s: can't setuid: %m", pw->pw_name); 1629 fatal("Can't drop privileges."); 1630 } 1631 } else { 1632 if (seteuid((uid_t)pw->pw_uid) < 0) { 1633 syslog(LOG_NOTICE, "user %s: can't seteuid: %m", pw->pw_name); 1634 fatal("Can't drop privileges."); 1635 } 1636 } 1637 setenv("HOME", homedir, 1); 1638 1639 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1640 quietmessages = 1; 1641 1642 /* 1643 * Display a login message, if it exists. 1644 * N.B. reply(230,) must follow the message. 1645 */ 1646 if (! EMPTYSTR(curclass.motd)) 1647 (void)display_file(conffilename(curclass.motd), 230); 1648 show_chdir_messages(230); 1649 if (curclass.type == CLASS_GUEST) { 1650 char *p; 1651 1652 reply(230, "Guest login ok, access restrictions apply."); 1653 #if defined(HAVE_SETPROCTITLE) 1654 snprintf(proctitle, sizeof(proctitle), 1655 "%s: anonymous/%s", remotehost, passwd); 1656 setproctitle("%s", proctitle); 1657 #endif /* defined(HAVE_SETPROCTITLE) */ 1658 if (logging) 1659 syslog(LOG_INFO, 1660 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1661 remoteloghost, passwd, 1662 curclass.classname, CURCLASSTYPE); 1663 /* store guest password reply into pw_passwd */ 1664 REASSIGN(pw->pw_passwd, ftpd_strdup(passwd)); 1665 for (p = pw->pw_passwd; *p; p++) 1666 if (!isgraph((unsigned char)*p)) 1667 *p = '_'; 1668 } else { 1669 reply(230, "User %s logged in.", pw->pw_name); 1670 #if defined(HAVE_SETPROCTITLE) 1671 snprintf(proctitle, sizeof(proctitle), 1672 "%s: %s", remotehost, pw->pw_name); 1673 setproctitle("%s", proctitle); 1674 #endif /* defined(HAVE_SETPROCTITLE) */ 1675 if (logging) 1676 syslog(LOG_INFO, 1677 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1678 remoteloghost, pw->pw_name, 1679 curclass.classname, CURCLASSTYPE); 1680 } 1681 (void) umask(curclass.umask); 1682 #ifdef LOGIN_CAP 1683 login_close(lc); 1684 #endif 1685 return; 1686 1687 bad: 1688 #ifdef LOGIN_CAP 1689 login_close(lc); 1690 #endif 1691 /* Forget all about it... */ 1692 end_login(); 1693 } 1694 1695 void 1696 retrieve(const char *argv[], const char *name) 1697 { 1698 FILE *fin, *dout; 1699 struct stat st; 1700 int (*closefunc)(FILE *) = NULL; 1701 int dolog, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1702 struct timeval start, finish, td, *tdp; 1703 struct rusage rusage_before, rusage_after; 1704 const char *dispname; 1705 const char *error; 1706 1707 sendrv = closerv = stderrfd = -1; 1708 isconversion = isdata = isls = dolog = 0; 1709 tdp = NULL; 1710 dispname = name; 1711 fin = dout = NULL; 1712 error = NULL; 1713 if (argv == NULL) { /* if not running a command ... */ 1714 dolog = 1; 1715 isdata = 1; 1716 fin = fopen(name, "r"); 1717 closefunc = fclose; 1718 if (fin == NULL) /* doesn't exist?; try a conversion */ 1719 argv = do_conversion(name); 1720 if (argv != NULL) { 1721 isconversion++; 1722 syslog(LOG_DEBUG, "get command: '%s' on '%s'", 1723 argv[0], name); 1724 } 1725 } 1726 if (argv != NULL) { 1727 char temp[MAXPATHLEN]; 1728 1729 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1730 isls = 1; 1731 stderrfd = -1; 1732 } else { 1733 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1734 stderrfd = mkstemp(temp); 1735 if (stderrfd != -1) 1736 (void)unlink(temp); 1737 } 1738 dispname = argv[0]; 1739 fin = ftpd_popen(argv, "r", stderrfd); 1740 closefunc = ftpd_pclose; 1741 st.st_size = -1; 1742 st.st_blksize = BUFSIZ; 1743 } 1744 if (fin == NULL) { 1745 if (errno != 0) { 1746 perror_reply(550, dispname); 1747 if (dolog) 1748 logxfer("get", -1, name, NULL, NULL, 1749 strerror(errno)); 1750 } 1751 goto cleanupretrieve; 1752 } 1753 byte_count = -1; 1754 if (argv == NULL 1755 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1756 error = "Not a plain file"; 1757 reply(550, "%s: %s.", dispname, error); 1758 goto done; 1759 } 1760 if (restart_point) { 1761 if (type == TYPE_A) { 1762 off_t i; 1763 int c; 1764 1765 for (i = 0; i < restart_point; i++) { 1766 if ((c=getc(fin)) == EOF) { 1767 error = strerror(errno); 1768 perror_reply(550, dispname); 1769 goto done; 1770 } 1771 if (c == '\n') 1772 i++; 1773 } 1774 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1775 error = strerror(errno); 1776 perror_reply(550, dispname); 1777 goto done; 1778 } 1779 } 1780 dout = dataconn(dispname, st.st_size, "w"); 1781 if (dout == NULL) 1782 goto done; 1783 1784 (void)getrusage(RUSAGE_SELF, &rusage_before); 1785 (void)gettimeofday(&start, NULL); 1786 sendrv = send_data(fin, dout, &st, isdata); 1787 (void)gettimeofday(&finish, NULL); 1788 (void)getrusage(RUSAGE_SELF, &rusage_after); 1789 closedataconn(dout); /* close now to affect timing stats */ 1790 timersub(&finish, &start, &td); 1791 tdp = &td; 1792 done: 1793 if (dolog) { 1794 logxfer("get", byte_count, name, NULL, tdp, error); 1795 if (tdp != NULL) 1796 logrusage(&rusage_before, &rusage_after); 1797 } 1798 closerv = (*closefunc)(fin); 1799 if (sendrv == 0) { 1800 FILE *errf; 1801 struct stat sb; 1802 1803 if (!isls && argv != NULL && closerv != 0) { 1804 reply(-226, 1805 "Command returned an exit status of %d", 1806 closerv); 1807 if (isconversion) 1808 syslog(LOG_WARNING, 1809 "retrieve command: '%s' returned %d", 1810 argv[0], closerv); 1811 } 1812 if (!isls && argv != NULL && stderrfd != -1 && 1813 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1814 ((errf = fdopen(stderrfd, "r")) != NULL)) { 1815 char *cp, line[LINE_MAX]; 1816 1817 reply(-226, "Command error messages:"); 1818 rewind(errf); 1819 while (fgets(line, sizeof(line), errf) != NULL) { 1820 if ((cp = strchr(line, '\n')) != NULL) 1821 *cp = '\0'; 1822 reply(0, " %s", line); 1823 } 1824 (void) fflush(stdout); 1825 (void) fclose(errf); 1826 /* a reply(226,) must follow */ 1827 } 1828 reply(226, "Transfer complete."); 1829 } 1830 cleanupretrieve: 1831 if (stderrfd != -1) 1832 (void)close(stderrfd); 1833 if (isconversion) 1834 free(argv); 1835 } 1836 1837 void 1838 store(const char *name, const char *fmode, int unique) 1839 { 1840 FILE *fout, *din; 1841 struct stat st; 1842 int (*closefunc)(FILE *); 1843 struct timeval start, finish, td, *tdp; 1844 const char *desc, *error; 1845 1846 din = NULL; 1847 desc = (*fmode == 'w') ? "put" : "append"; 1848 error = NULL; 1849 if (unique && stat(name, &st) == 0 && 1850 (name = gunique(name)) == NULL) { 1851 logxfer(desc, -1, name, NULL, NULL, 1852 "cannot create unique file"); 1853 goto cleanupstore; 1854 } 1855 1856 if (restart_point) 1857 fmode = "r+"; 1858 fout = fopen(name, fmode); 1859 closefunc = fclose; 1860 tdp = NULL; 1861 if (fout == NULL) { 1862 perror_reply(553, name); 1863 logxfer(desc, -1, name, NULL, NULL, strerror(errno)); 1864 goto cleanupstore; 1865 } 1866 byte_count = -1; 1867 if (restart_point) { 1868 if (type == TYPE_A) { 1869 off_t i; 1870 int c; 1871 1872 for (i = 0; i < restart_point; i++) { 1873 if ((c=getc(fout)) == EOF) { 1874 error = strerror(errno); 1875 perror_reply(550, name); 1876 goto done; 1877 } 1878 if (c == '\n') 1879 i++; 1880 } 1881 /* 1882 * We must do this seek to "current" position 1883 * because we are changing from reading to 1884 * writing. 1885 */ 1886 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1887 error = strerror(errno); 1888 perror_reply(550, name); 1889 goto done; 1890 } 1891 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1892 error = strerror(errno); 1893 perror_reply(550, name); 1894 goto done; 1895 } 1896 } 1897 din = dataconn(name, (off_t)-1, "r"); 1898 if (din == NULL) 1899 goto done; 1900 (void)gettimeofday(&start, NULL); 1901 if (receive_data(din, fout) == 0) { 1902 if (unique) 1903 reply(226, "Transfer complete (unique file name:%s).", 1904 name); 1905 else 1906 reply(226, "Transfer complete."); 1907 } 1908 (void)gettimeofday(&finish, NULL); 1909 closedataconn(din); /* close now to affect timing stats */ 1910 timersub(&finish, &start, &td); 1911 tdp = &td; 1912 done: 1913 logxfer(desc, byte_count, name, NULL, tdp, error); 1914 (*closefunc)(fout); 1915 cleanupstore: 1916 ; 1917 } 1918 1919 static FILE * 1920 getdatasock(const char *fmode) 1921 { 1922 int on, s, t, tries; 1923 in_port_t port; 1924 1925 on = 1; 1926 if (data >= 0) 1927 return (fdopen(data, fmode)); 1928 if (! dropprivs) { 1929 if (seteuid((uid_t)0) < 0) { 1930 syslog(LOG_NOTICE, "getdatasock: can't seteuid 0: %m"); 1931 fatal("Can't reset privileges."); 1932 } 1933 } 1934 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1935 if (s < 0) 1936 goto bad; 1937 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1938 (char *) &on, sizeof(on)) < 0) 1939 goto bad; 1940 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1941 (char *) &on, sizeof(on)) < 0) 1942 goto bad; 1943 /* anchor socket to avoid multi-homing problems */ 1944 data_source = ctrl_addr; 1945 /* 1946 * By default source port for PORT connections is 1947 * ctrlport-1 (see RFC959 section 5.2). 1948 * However, if privs have been dropped and that 1949 * would be < IPPORT_RESERVED, use a random port 1950 * instead. 1951 */ 1952 if (dataport) 1953 port = dataport; 1954 else 1955 port = ntohs(ctrl_addr.su_port) - 1; 1956 if (dropprivs && port < IPPORT_RESERVED) 1957 port = 0; /* use random port */ 1958 data_source.su_port = htons(port); 1959 1960 for (tries = 1; ; tries++) { 1961 if (bind(s, (struct sockaddr *)&data_source.si_su, 1962 data_source.su_len) >= 0) 1963 break; 1964 if (errno != EADDRINUSE || tries > 10) 1965 goto bad; 1966 sleep(tries); 1967 } 1968 if (! dropprivs) { 1969 if (seteuid((uid_t)pw->pw_uid) < 0) { 1970 syslog(LOG_NOTICE, "user %s: can't seteuid: %m", pw->pw_name); 1971 fatal("Can't drop privileges."); 1972 } 1973 } 1974 #ifdef IP_TOS 1975 if (!mapped && ctrl_addr.su_family == AF_INET) { 1976 on = IPTOS_THROUGHPUT; 1977 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1978 sizeof(int)) < 0) 1979 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1980 } 1981 #endif 1982 return (fdopen(s, fmode)); 1983 bad: 1984 /* Return the real value of errno (close may change it) */ 1985 t = errno; 1986 if (! dropprivs) { 1987 if (seteuid((uid_t)pw->pw_uid) < 0) { 1988 syslog(LOG_NOTICE, "user %s: can't seteuid: %m", pw->pw_name); 1989 fatal("Can't drop privileges."); 1990 } 1991 } 1992 if (s >= 0) 1993 (void) close(s); 1994 errno = t; 1995 return (NULL); 1996 } 1997 1998 FILE * 1999 dataconn(const char *name, off_t size, const char *fmode) 2000 { 2001 char sizebuf[32]; 2002 FILE *file; 2003 int retry, tos, keepalive, conerrno; 2004 2005 file_size = size; 2006 byte_count = 0; 2007 if (size != (off_t) -1) 2008 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 2009 (LLT)size, PLURAL(size)); 2010 else 2011 sizebuf[0] = '\0'; 2012 if (pdata >= 0) { 2013 struct sockinet from; 2014 int s; 2015 socklen_t fromlen = sizeof(from.su_len); 2016 2017 (void) alarm(curclass.timeout); 2018 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 2019 (void) alarm(0); 2020 if (s < 0) { 2021 reply(425, "Can't open data connection."); 2022 (void) close(pdata); 2023 pdata = -1; 2024 return (NULL); 2025 } 2026 (void) close(pdata); 2027 pdata = s; 2028 switch (from.su_family) { 2029 case AF_INET: 2030 #ifdef IP_TOS 2031 if (!mapped) { 2032 tos = IPTOS_THROUGHPUT; 2033 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 2034 (char *)&tos, sizeof(int)); 2035 } 2036 break; 2037 #endif 2038 } 2039 /* Set keepalives on the socket to detect dropped conns. */ 2040 #ifdef SO_KEEPALIVE 2041 keepalive = 1; 2042 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 2043 (char *)&keepalive, sizeof(int)); 2044 #endif 2045 reply(150, "Opening %s mode data connection for '%s'%s.", 2046 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2047 return (fdopen(pdata, fmode)); 2048 } 2049 if (data >= 0) { 2050 reply(125, "Using existing data connection for '%s'%s.", 2051 name, sizebuf); 2052 usedefault = 1; 2053 return (fdopen(data, fmode)); 2054 } 2055 if (usedefault) 2056 data_dest = his_addr; 2057 usedefault = 1; 2058 retry = conerrno = 0; 2059 do { 2060 file = getdatasock(fmode); 2061 if (file == NULL) { 2062 char hbuf[NI_MAXHOST]; 2063 char pbuf[NI_MAXSERV]; 2064 conerrno = errno; 2065 if (getnameinfo((struct sockaddr *)&data_source.si_su, 2066 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 2067 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV)) 2068 strlcpy(hbuf, "?", sizeof(hbuf)); 2069 reply(425, "Can't create data socket (%s,%s): %s.", 2070 hbuf, pbuf, strerror(conerrno)); 2071 return (NULL); 2072 } 2073 data = fileno(file); 2074 conerrno = 0; 2075 if (connect(data, (struct sockaddr *)&data_dest.si_su, 2076 data_dest.su_len) == 0) 2077 break; 2078 conerrno = errno; 2079 (void) fclose(file); 2080 file = NULL; 2081 data = -1; 2082 if (conerrno == EADDRINUSE) { 2083 sleep((unsigned) swaitint); 2084 retry += swaitint; 2085 } else { 2086 break; 2087 } 2088 } while (retry <= swaitmax); 2089 if (conerrno != 0) { 2090 perror_reply(425, "Can't build data connection"); 2091 return (NULL); 2092 } 2093 reply(150, "Opening %s mode data connection for '%s'%s.", 2094 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2095 return (file); 2096 } 2097 2098 void 2099 closedataconn(FILE *fd) 2100 { 2101 2102 if (fd == NULL) 2103 return; 2104 (void)fclose(fd); 2105 data = -1; 2106 if (pdata >= 0) 2107 (void)close(pdata); 2108 pdata = -1; 2109 } 2110 2111 int 2112 write_data(int fd, char *buf, size_t size, off_t *bufrem, 2113 struct timeval *then, int isdata) 2114 { 2115 struct timeval now, td; 2116 ssize_t c; 2117 2118 while (size > 0) { 2119 c = size; 2120 if (curclass.writesize) { 2121 if (curclass.writesize < c) 2122 c = curclass.writesize; 2123 } 2124 if (curclass.rateget) { 2125 if (*bufrem < c) 2126 c = *bufrem; 2127 } 2128 (void) alarm(curclass.timeout); 2129 c = write(fd, buf, c); 2130 if (c <= 0) 2131 return (1); 2132 buf += c; 2133 size -= c; 2134 byte_count += c; 2135 if (isdata) { 2136 total_data_out += c; 2137 total_data += c; 2138 } 2139 total_bytes_out += c; 2140 total_bytes += c; 2141 if (curclass.rateget) { 2142 *bufrem -= c; 2143 if (*bufrem == 0) { 2144 (void)gettimeofday(&now, NULL); 2145 timersub(&now, then, &td); 2146 if (td.tv_sec == 0) { 2147 usleep(1000000 - td.tv_usec); 2148 (void)gettimeofday(then, NULL); 2149 } else 2150 *then = now; 2151 *bufrem = curclass.rateget; 2152 } 2153 } 2154 } 2155 return (0); 2156 } 2157 2158 static enum send_status 2159 send_data_with_read(int filefd, int netfd, const struct stat *st, int isdata) 2160 { 2161 struct timeval then; 2162 off_t bufrem; 2163 ssize_t readsize; 2164 char *buf; 2165 int c, error; 2166 2167 if (curclass.readsize > 0) 2168 readsize = curclass.readsize; 2169 else 2170 readsize = st->st_blksize; 2171 if ((buf = malloc(readsize)) == NULL) { 2172 perror_reply(451, "Local resource failure: malloc"); 2173 return (SS_NO_TRANSFER); 2174 } 2175 2176 if (curclass.rateget) { 2177 bufrem = curclass.rateget; 2178 (void)gettimeofday(&then, NULL); 2179 } else 2180 bufrem = readsize; 2181 for (;;) { 2182 (void) alarm(curclass.timeout); 2183 c = read(filefd, buf, readsize); 2184 if (c == 0) 2185 error = SS_SUCCESS; 2186 else if (c < 0) 2187 error = SS_FILE_ERROR; 2188 else if (write_data(netfd, buf, c, &bufrem, &then, isdata)) 2189 error = SS_DATA_ERROR; 2190 else if (urgflag && handleoobcmd()) 2191 error = SS_ABORTED; 2192 else 2193 continue; 2194 2195 free(buf); 2196 return (error); 2197 } 2198 } 2199 2200 static enum send_status 2201 send_data_with_mmap(int filefd, int netfd, const struct stat *st, int isdata) 2202 { 2203 struct timeval then; 2204 off_t bufrem, filesize, off, origoff; 2205 ssize_t mapsize, winsize; 2206 int error, sendbufsize, sendlowat; 2207 void *win; 2208 2209 bufrem = 0; 2210 if (curclass.sendbufsize) { 2211 sendbufsize = curclass.sendbufsize; 2212 if (setsockopt(netfd, SOL_SOCKET, SO_SNDBUF, 2213 &sendbufsize, sizeof(int)) == -1) 2214 syslog(LOG_WARNING, "setsockopt(SO_SNDBUF, %d): %m", 2215 sendbufsize); 2216 } 2217 2218 if (curclass.sendlowat) { 2219 sendlowat = curclass.sendlowat; 2220 if (setsockopt(netfd, SOL_SOCKET, SO_SNDLOWAT, 2221 &sendlowat, sizeof(int)) == -1) 2222 syslog(LOG_WARNING, "setsockopt(SO_SNDLOWAT, %d): %m", 2223 sendlowat); 2224 } 2225 2226 winsize = curclass.mmapsize; 2227 filesize = st->st_size; 2228 if (ftpd_debug) 2229 syslog(LOG_INFO, "mmapsize = " LLF ", writesize = " LLF, 2230 (LLT)winsize, (LLT)curclass.writesize); 2231 if (winsize <= 0) 2232 goto try_read; 2233 2234 off = lseek(filefd, (off_t)0, SEEK_CUR); 2235 if (off == -1) 2236 goto try_read; 2237 2238 origoff = off; 2239 if (curclass.rateget) { 2240 bufrem = curclass.rateget; 2241 (void)gettimeofday(&then, NULL); 2242 } else 2243 bufrem = winsize; 2244 while (1) { 2245 mapsize = MIN(filesize - off, winsize); 2246 if (mapsize == 0) 2247 break; 2248 win = mmap(NULL, mapsize, PROT_READ, 2249 MAP_FILE|MAP_SHARED, filefd, off); 2250 if (win == MAP_FAILED) { 2251 if (off == origoff) 2252 goto try_read; 2253 return (SS_FILE_ERROR); 2254 } 2255 (void) madvise(win, mapsize, MADV_SEQUENTIAL); 2256 error = write_data(netfd, win, mapsize, &bufrem, &then, 2257 isdata); 2258 (void) madvise(win, mapsize, MADV_DONTNEED); 2259 munmap(win, mapsize); 2260 if (urgflag && handleoobcmd()) 2261 return (SS_ABORTED); 2262 if (error) 2263 return (SS_DATA_ERROR); 2264 off += mapsize; 2265 } 2266 return (SS_SUCCESS); 2267 2268 try_read: 2269 return (send_data_with_read(filefd, netfd, st, isdata)); 2270 } 2271 2272 /* 2273 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2274 * encapsulation of the data subject to Mode, Structure, and Type. 2275 * 2276 * NB: Form isn't handled. 2277 */ 2278 static int 2279 send_data(FILE *instr, FILE *outstr, const struct stat *st, int isdata) 2280 { 2281 int c, filefd, netfd, rval; 2282 2283 urgflag = 0; 2284 transflag = 1; 2285 rval = -1; 2286 2287 switch (type) { 2288 2289 case TYPE_A: 2290 /* XXXLUKEM: rate limit ascii send (get) */ 2291 (void) alarm(curclass.timeout); 2292 while ((c = getc(instr)) != EOF) { 2293 if (urgflag && handleoobcmd()) 2294 goto cleanup_send_data; 2295 byte_count++; 2296 if (c == '\n') { 2297 if (ferror(outstr)) 2298 goto data_err; 2299 (void) putc('\r', outstr); 2300 if (isdata) { 2301 total_data_out++; 2302 total_data++; 2303 } 2304 total_bytes_out++; 2305 total_bytes++; 2306 } 2307 (void) putc(c, outstr); 2308 if (isdata) { 2309 total_data_out++; 2310 total_data++; 2311 } 2312 total_bytes_out++; 2313 total_bytes++; 2314 if ((byte_count % 4096) == 0) 2315 (void) alarm(curclass.timeout); 2316 } 2317 (void) alarm(0); 2318 fflush(outstr); 2319 if (ferror(instr)) 2320 goto file_err; 2321 if (ferror(outstr)) 2322 goto data_err; 2323 rval = 0; 2324 goto cleanup_send_data; 2325 2326 case TYPE_I: 2327 case TYPE_L: 2328 filefd = fileno(instr); 2329 netfd = fileno(outstr); 2330 switch (send_data_with_mmap(filefd, netfd, st, isdata)) { 2331 2332 case SS_SUCCESS: 2333 break; 2334 2335 case SS_ABORTED: 2336 case SS_NO_TRANSFER: 2337 goto cleanup_send_data; 2338 2339 case SS_FILE_ERROR: 2340 goto file_err; 2341 2342 case SS_DATA_ERROR: 2343 goto data_err; 2344 } 2345 rval = 0; 2346 goto cleanup_send_data; 2347 2348 default: 2349 reply(550, "Unimplemented TYPE %d in send_data", type); 2350 goto cleanup_send_data; 2351 } 2352 2353 data_err: 2354 (void) alarm(0); 2355 perror_reply(426, "Data connection"); 2356 goto cleanup_send_data; 2357 2358 file_err: 2359 (void) alarm(0); 2360 perror_reply(551, "Error on input file"); 2361 goto cleanup_send_data; 2362 2363 cleanup_send_data: 2364 (void) alarm(0); 2365 transflag = 0; 2366 urgflag = 0; 2367 if (isdata) { 2368 total_files_out++; 2369 total_files++; 2370 } 2371 total_xfers_out++; 2372 total_xfers++; 2373 return (rval); 2374 } 2375 2376 /* 2377 * Transfer data from peer to "outstr" using the appropriate encapsulation of 2378 * the data subject to Mode, Structure, and Type. 2379 * 2380 * N.B.: Form isn't handled. 2381 */ 2382 static int 2383 receive_data(FILE *instr, FILE *outstr) 2384 { 2385 int c, netfd, filefd, rval; 2386 int volatile bare_lfs; 2387 off_t byteswritten; 2388 char *buf; 2389 ssize_t readsize; 2390 struct sigaction sa, sa_saved; 2391 struct stat st; 2392 2393 memset(&sa, 0, sizeof(sa)); 2394 sigfillset(&sa.sa_mask); 2395 sa.sa_flags = SA_RESTART; 2396 sa.sa_handler = lostconn; 2397 (void) sigaction(SIGALRM, &sa, &sa_saved); 2398 2399 bare_lfs = 0; 2400 urgflag = 0; 2401 transflag = 1; 2402 rval = -1; 2403 byteswritten = 0; 2404 buf = NULL; 2405 2406 #define FILESIZECHECK(x) \ 2407 do { \ 2408 if (curclass.maxfilesize != -1 && \ 2409 (x) > curclass.maxfilesize) { \ 2410 errno = EFBIG; \ 2411 goto file_err; \ 2412 } \ 2413 } while (0) 2414 2415 switch (type) { 2416 2417 case TYPE_I: 2418 case TYPE_L: 2419 netfd = fileno(instr); 2420 filefd = fileno(outstr); 2421 (void) alarm(curclass.timeout); 2422 if (curclass.readsize) 2423 readsize = curclass.readsize; 2424 else if (fstat(filefd, &st) != -1) 2425 readsize = (ssize_t)st.st_blksize; 2426 else 2427 readsize = BUFSIZ; 2428 if ((buf = malloc(readsize)) == NULL) { 2429 perror_reply(451, "Local resource failure: malloc"); 2430 goto cleanup_recv_data; 2431 } 2432 if (curclass.rateput) { 2433 while (1) { 2434 int d; 2435 struct timeval then, now, td; 2436 off_t bufrem; 2437 2438 (void)gettimeofday(&then, NULL); 2439 errno = c = d = 0; 2440 for (bufrem = curclass.rateput; bufrem > 0; ) { 2441 if ((c = read(netfd, buf, 2442 MIN(readsize, bufrem))) <= 0) 2443 goto recvdone; 2444 if (urgflag && handleoobcmd()) 2445 goto cleanup_recv_data; 2446 FILESIZECHECK(byte_count + c); 2447 if ((d = write(filefd, buf, c)) != c) 2448 goto file_err; 2449 (void) alarm(curclass.timeout); 2450 bufrem -= c; 2451 byte_count += c; 2452 total_data_in += c; 2453 total_data += c; 2454 total_bytes_in += c; 2455 total_bytes += c; 2456 } 2457 (void)gettimeofday(&now, NULL); 2458 timersub(&now, &then, &td); 2459 if (td.tv_sec == 0) 2460 usleep(1000000 - td.tv_usec); 2461 } 2462 } else { 2463 while ((c = read(netfd, buf, readsize)) > 0) { 2464 if (urgflag && handleoobcmd()) 2465 goto cleanup_recv_data; 2466 FILESIZECHECK(byte_count + c); 2467 if (write(filefd, buf, c) != c) 2468 goto file_err; 2469 (void) alarm(curclass.timeout); 2470 byte_count += c; 2471 total_data_in += c; 2472 total_data += c; 2473 total_bytes_in += c; 2474 total_bytes += c; 2475 } 2476 } 2477 recvdone: 2478 if (c < 0) 2479 goto data_err; 2480 rval = 0; 2481 goto cleanup_recv_data; 2482 2483 case TYPE_E: 2484 reply(553, "TYPE E not implemented."); 2485 goto cleanup_recv_data; 2486 2487 case TYPE_A: 2488 (void) alarm(curclass.timeout); 2489 /* XXXLUKEM: rate limit ascii receive (put) */ 2490 while ((c = getc(instr)) != EOF) { 2491 if (urgflag && handleoobcmd()) 2492 goto cleanup_recv_data; 2493 byte_count++; 2494 total_data_in++; 2495 total_data++; 2496 total_bytes_in++; 2497 total_bytes++; 2498 if ((byte_count % 4096) == 0) 2499 (void) alarm(curclass.timeout); 2500 if (c == '\n') 2501 bare_lfs++; 2502 while (c == '\r') { 2503 if (ferror(outstr)) 2504 goto data_err; 2505 if ((c = getc(instr)) != '\n') { 2506 byte_count++; 2507 total_data_in++; 2508 total_data++; 2509 total_bytes_in++; 2510 total_bytes++; 2511 if ((byte_count % 4096) == 0) 2512 (void) alarm(curclass.timeout); 2513 byteswritten++; 2514 FILESIZECHECK(byteswritten); 2515 (void) putc ('\r', outstr); 2516 if (c == '\0' || c == EOF) 2517 goto contin2; 2518 } 2519 } 2520 byteswritten++; 2521 FILESIZECHECK(byteswritten); 2522 (void) putc(c, outstr); 2523 contin2: ; 2524 } 2525 (void) alarm(0); 2526 fflush(outstr); 2527 if (ferror(instr)) 2528 goto data_err; 2529 if (ferror(outstr)) 2530 goto file_err; 2531 if (bare_lfs) { 2532 reply(-226, 2533 "WARNING! %d bare linefeeds received in ASCII mode", 2534 bare_lfs); 2535 reply(0, "File may not have transferred correctly."); 2536 } 2537 rval = 0; 2538 goto cleanup_recv_data; 2539 2540 default: 2541 reply(550, "Unimplemented TYPE %d in receive_data", type); 2542 goto cleanup_recv_data; 2543 } 2544 #undef FILESIZECHECK 2545 2546 data_err: 2547 (void) alarm(0); 2548 perror_reply(426, "Data Connection"); 2549 goto cleanup_recv_data; 2550 2551 file_err: 2552 (void) alarm(0); 2553 perror_reply(452, "Error writing file"); 2554 goto cleanup_recv_data; 2555 2556 cleanup_recv_data: 2557 (void) alarm(0); 2558 (void) sigaction(SIGALRM, &sa_saved, NULL); 2559 if (buf) 2560 free(buf); 2561 transflag = 0; 2562 urgflag = 0; 2563 total_files_in++; 2564 total_files++; 2565 total_xfers_in++; 2566 total_xfers++; 2567 return (rval); 2568 } 2569 2570 void 2571 statcmd(void) 2572 { 2573 struct sockinet *su = NULL; 2574 static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 2575 unsigned char *a, *p; 2576 int ispassive, af; 2577 off_t otbi, otbo, otb; 2578 2579 a = p = NULL; 2580 2581 reply(-211, "%s FTP server status:", hostname); 2582 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 2583 hbuf[0] = '\0'; 2584 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 2585 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) 2586 && strcmp(remotehost, hbuf) != 0) 2587 reply(0, "Connected to %s (%s)", remotehost, hbuf); 2588 else 2589 reply(0, "Connected to %s", remotehost); 2590 2591 if (logged_in) { 2592 if (curclass.type == CLASS_GUEST) 2593 reply(0, "Logged in anonymously"); 2594 else 2595 reply(0, "Logged in as %s%s", pw->pw_name, 2596 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 2597 } else if (askpasswd) 2598 reply(0, "Waiting for password"); 2599 else 2600 reply(0, "Waiting for user name"); 2601 cprintf(stdout, " TYPE: %s", typenames[type]); 2602 if (type == TYPE_A || type == TYPE_E) 2603 cprintf(stdout, ", FORM: %s", formnames[form]); 2604 if (type == TYPE_L) { 2605 #if NBBY == 8 2606 cprintf(stdout, " %d", NBBY); 2607 #else 2608 /* XXX: `bytesize' needs to be defined in this case */ 2609 cprintf(stdout, " %d", bytesize); 2610 #endif 2611 } 2612 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 2613 strunames[stru], modenames[mode]); 2614 ispassive = 0; 2615 if (data != -1) { 2616 reply(0, "Data connection open"); 2617 su = NULL; 2618 } else if (pdata != -1) { 2619 reply(0, "in Passive mode"); 2620 if (curclass.advertise.su_len != 0) 2621 su = &curclass.advertise; 2622 else 2623 su = &pasv_addr; 2624 ispassive = 1; 2625 goto printaddr; 2626 } else if (usedefault == 0) { 2627 su = (struct sockinet *)&data_dest; 2628 2629 if (epsvall) { 2630 reply(0, "EPSV only mode (EPSV ALL)"); 2631 goto epsvonly; 2632 } 2633 printaddr: 2634 /* PASV/PORT */ 2635 if (su->su_family == AF_INET) { 2636 a = (unsigned char *) &su->su_addr; 2637 p = (unsigned char *) &su->su_port; 2638 #define UC(b) (((int) b) & 0xff) 2639 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 2640 ispassive ? "PASV" : "PORT" , 2641 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2642 UC(p[0]), UC(p[1])); 2643 } 2644 2645 /* LPSV/LPRT */ 2646 { 2647 int alen, i; 2648 2649 alen = 0; 2650 switch (su->su_family) { 2651 case AF_INET: 2652 a = (unsigned char *) &su->su_addr; 2653 p = (unsigned char *) &su->su_port; 2654 alen = sizeof(su->su_addr); 2655 af = 4; 2656 break; 2657 #ifdef INET6 2658 case AF_INET6: 2659 a = (unsigned char *) &su->su_6addr; 2660 p = (unsigned char *) &su->su_port; 2661 alen = sizeof(su->su_6addr); 2662 af = 6; 2663 break; 2664 #endif 2665 default: 2666 af = 0; 2667 break; 2668 } 2669 if (af) { 2670 cprintf(stdout, " %s (%d,%d", 2671 ispassive ? "LPSV" : "LPRT", af, alen); 2672 for (i = 0; i < alen; i++) 2673 cprintf(stdout, ",%d", UC(a[i])); 2674 cprintf(stdout, ",%d,%d,%d)\r\n", 2675 2, UC(p[0]), UC(p[1])); 2676 #undef UC 2677 } 2678 } 2679 2680 /* EPRT/EPSV */ 2681 epsvonly: 2682 af = af2epsvproto(su->su_family); 2683 hbuf[0] = '\0'; 2684 if (af > 0) { 2685 struct sockinet tmp; 2686 2687 tmp = *su; 2688 #ifdef INET6 2689 if (tmp.su_family == AF_INET6) 2690 tmp.su_scope_id = 0; 2691 #endif 2692 if (getnameinfo((struct sockaddr *)&tmp.si_su, 2693 tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 2694 NI_NUMERICHOST | NI_NUMERICSERV) == 0) 2695 reply(0, "%s (|%d|%s|%s|)", 2696 ispassive ? "EPSV" : "EPRT", 2697 af, hbuf, sbuf); 2698 } 2699 } else 2700 reply(0, "No data connection"); 2701 2702 if (logged_in) { 2703 reply(0, 2704 "Data sent: " LLF " byte%s in " LLF " file%s", 2705 (LLT)total_data_out, PLURAL(total_data_out), 2706 (LLT)total_files_out, PLURAL(total_files_out)); 2707 reply(0, 2708 "Data received: " LLF " byte%s in " LLF " file%s", 2709 (LLT)total_data_in, PLURAL(total_data_in), 2710 (LLT)total_files_in, PLURAL(total_files_in)); 2711 reply(0, 2712 "Total data: " LLF " byte%s in " LLF " file%s", 2713 (LLT)total_data, PLURAL(total_data), 2714 (LLT)total_files, PLURAL(total_files)); 2715 } 2716 otbi = total_bytes_in; 2717 otbo = total_bytes_out; 2718 otb = total_bytes; 2719 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 2720 (LLT)otbo, PLURAL(otbo), 2721 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 2722 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 2723 (LLT)otbi, PLURAL(otbi), 2724 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 2725 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 2726 (LLT)otb, PLURAL(otb), 2727 (LLT)total_xfers, PLURAL(total_xfers)); 2728 2729 if (logged_in && !CURCLASS_FLAGS_ISSET(private)) { 2730 struct ftpconv *cp; 2731 2732 reply(0, "%s", ""); 2733 reply(0, "Class: %s, type: %s", 2734 curclass.classname, CURCLASSTYPE); 2735 reply(0, "Check PORT/LPRT commands: %sabled", 2736 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 2737 if (! EMPTYSTR(curclass.display)) 2738 reply(0, "Display file: %s", curclass.display); 2739 if (! EMPTYSTR(curclass.notify)) 2740 reply(0, "Notify fileglob: %s", curclass.notify); 2741 reply(0, "Idle timeout: " LLF ", maximum timeout: " LLF, 2742 (LLT)curclass.timeout, (LLT)curclass.maxtimeout); 2743 reply(0, "Current connections: %d", connections); 2744 if (curclass.limit == -1) 2745 reply(0, "Maximum connections: unlimited"); 2746 else 2747 reply(0, "Maximum connections: " LLF, 2748 (LLT)curclass.limit); 2749 if (curclass.limitfile) 2750 reply(0, "Connection limit exceeded message file: %s", 2751 conffilename(curclass.limitfile)); 2752 if (! EMPTYSTR(curclass.chroot)) 2753 reply(0, "Chroot format: %s", curclass.chroot); 2754 reply(0, "Deny bad ftpusers(5) quickly: %sabled", 2755 CURCLASS_FLAGS_ISSET(denyquick) ? "en" : "dis"); 2756 if (! EMPTYSTR(curclass.homedir)) 2757 reply(0, "Homedir format: %s", curclass.homedir); 2758 if (curclass.maxfilesize == -1) 2759 reply(0, "Maximum file size: unlimited"); 2760 else 2761 reply(0, "Maximum file size: " LLF, 2762 (LLT)curclass.maxfilesize); 2763 if (! EMPTYSTR(curclass.motd)) 2764 reply(0, "MotD file: %s", conffilename(curclass.motd)); 2765 reply(0, 2766 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2767 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2768 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2769 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2770 reply(0, "Sanitize file names: %sabled", 2771 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2772 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2773 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2774 if (curclass.advertise.su_len != 0) { 2775 char buf[50]; /* big enough for IPv6 address */ 2776 const char *bp; 2777 2778 bp = inet_ntop(curclass.advertise.su_family, 2779 (void *)&curclass.advertise.su_addr, 2780 buf, sizeof(buf)); 2781 if (bp != NULL) 2782 reply(0, "PASV advertise address: %s", bp); 2783 } 2784 if (curclass.portmin && curclass.portmax) 2785 reply(0, "PASV port range: " LLF " - " LLF, 2786 (LLT)curclass.portmin, (LLT)curclass.portmax); 2787 if (curclass.rateget) 2788 reply(0, "Rate get limit: " LLF " bytes/sec", 2789 (LLT)curclass.rateget); 2790 else 2791 reply(0, "Rate get limit: disabled"); 2792 if (curclass.rateput) 2793 reply(0, "Rate put limit: " LLF " bytes/sec", 2794 (LLT)curclass.rateput); 2795 else 2796 reply(0, "Rate put limit: disabled"); 2797 if (curclass.mmapsize) 2798 reply(0, "Mmap size: " LLF, (LLT)curclass.mmapsize); 2799 else 2800 reply(0, "Mmap size: disabled"); 2801 if (curclass.readsize) 2802 reply(0, "Read size: " LLF, (LLT)curclass.readsize); 2803 else 2804 reply(0, "Read size: default"); 2805 if (curclass.writesize) 2806 reply(0, "Write size: " LLF, (LLT)curclass.writesize); 2807 else 2808 reply(0, "Write size: default"); 2809 if (curclass.recvbufsize) 2810 reply(0, "Receive buffer size: " LLF, 2811 (LLT)curclass.recvbufsize); 2812 else 2813 reply(0, "Receive buffer size: default"); 2814 if (curclass.sendbufsize) 2815 reply(0, "Send buffer size: " LLF, 2816 (LLT)curclass.sendbufsize); 2817 else 2818 reply(0, "Send buffer size: default"); 2819 if (curclass.sendlowat) 2820 reply(0, "Send low water mark: " LLF, 2821 (LLT)curclass.sendlowat); 2822 else 2823 reply(0, "Send low water mark: default"); 2824 reply(0, "Umask: %.04o", curclass.umask); 2825 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2826 if (cp->suffix == NULL || cp->types == NULL || 2827 cp->command == NULL) 2828 continue; 2829 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2830 cp->suffix, cp->types, cp->disable, cp->command); 2831 } 2832 } 2833 2834 reply(211, "End of status"); 2835 } 2836 2837 void 2838 fatal(const char *s) 2839 { 2840 2841 reply(451, "Error in server: %s\n", s); 2842 reply(221, "Closing connection due to server error."); 2843 dologout(0); 2844 /* NOTREACHED */ 2845 } 2846 2847 /* 2848 * reply() -- 2849 * depending on the value of n, display fmt with a trailing CRLF and 2850 * prefix of: 2851 * n < -1 prefix the message with abs(n) + "-" (initial line) 2852 * n == 0 prefix the message with 4 spaces (middle lines) 2853 * n > 0 prefix the message with n + " " (final line) 2854 */ 2855 void 2856 reply(int n, const char *fmt, ...) 2857 { 2858 char msg[MAXPATHLEN * 2 + 100]; 2859 size_t b; 2860 va_list ap; 2861 2862 if (n == 0) 2863 b = snprintf(msg, sizeof(msg), " "); 2864 else if (n < 0) 2865 b = snprintf(msg, sizeof(msg), "%d-", -n); 2866 else 2867 b = snprintf(msg, sizeof(msg), "%d ", n); 2868 va_start(ap, fmt); 2869 vsnprintf(msg + b, sizeof(msg) - b, fmt, ap); 2870 va_end(ap); 2871 cprintf(stdout, "%s\r\n", msg); 2872 (void)fflush(stdout); 2873 if (ftpd_debug) 2874 syslog(LOG_DEBUG, "<--- %s", msg); 2875 } 2876 2877 static void 2878 logremotehost(struct sockinet *who) 2879 { 2880 2881 #if defined(HAVE_SOCKADDR_SNPRINTF) 2882 char abuf[MAXHOSTNAMELEN]; 2883 #endif 2884 2885 struct sockaddr *sa = (struct sockaddr *)&who->si_su; 2886 if (getnameinfo(sa, who->su_len, remotehost, sizeof(remotehost), NULL, 2887 0, getnameopts)) 2888 strlcpy(remotehost, "?", sizeof(remotehost)); 2889 #if defined(HAVE_SOCKADDR_SNPRINTF) 2890 sockaddr_snprintf(abuf, sizeof(abuf), "%a", sa); 2891 snprintf(remoteloghost, sizeof(remoteloghost), "%s(%s)", remotehost, 2892 abuf); 2893 #else 2894 strlcpy(remoteloghost, remotehost, sizeof(remoteloghost)); 2895 #endif 2896 2897 #if defined(HAVE_SETPROCTITLE) 2898 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2899 setproctitle("%s", proctitle); 2900 #endif /* defined(HAVE_SETPROCTITLE) */ 2901 if (logging) 2902 syslog(LOG_INFO, "connection from %s to %s", 2903 remoteloghost, hostname); 2904 } 2905 2906 /* 2907 * Record logout in wtmp file and exit with supplied status. 2908 * NOTE: because this is called from signal handlers it cannot 2909 * use stdio (or call other functions that use stdio). 2910 */ 2911 void 2912 dologout(int status) 2913 { 2914 /* 2915 * Prevent reception of SIGURG from resulting in a resumption 2916 * back to the main program loop. 2917 */ 2918 transflag = 0; 2919 logout_utmp(); 2920 if (logged_in) { 2921 #ifdef KERBEROS 2922 if (!notickets && krbtkfile_env) 2923 unlink(krbtkfile_env); 2924 #endif 2925 } 2926 /* beware of flushing buffers after a SIGPIPE */ 2927 if (xferlogfd != -1) 2928 close(xferlogfd); 2929 _exit(status); 2930 } 2931 2932 void 2933 abor(void) 2934 { 2935 2936 if (!transflag) 2937 return; 2938 tmpline[0] = '\0'; 2939 is_oob = 0; 2940 reply(426, "Transfer aborted. Data connection closed."); 2941 reply(226, "Abort successful"); 2942 transflag = 0; /* flag that the transfer has aborted */ 2943 } 2944 2945 void 2946 statxfer(void) 2947 { 2948 2949 if (!transflag) 2950 return; 2951 tmpline[0] = '\0'; 2952 is_oob = 0; 2953 if (file_size != (off_t) -1) 2954 reply(213, 2955 "Status: " LLF " of " LLF " byte%s transferred", 2956 (LLT)byte_count, (LLT)file_size, 2957 PLURAL(byte_count)); 2958 else 2959 reply(213, "Status: " LLF " byte%s transferred", 2960 (LLT)byte_count, PLURAL(byte_count)); 2961 } 2962 2963 /* 2964 * Call when urgflag != 0 to handle Out Of Band commands. 2965 * Returns non zero if the OOB command aborted the transfer 2966 * by setting transflag to 0. (c.f., "ABOR"). 2967 */ 2968 static int 2969 handleoobcmd(void) 2970 { 2971 char *cp; 2972 int ret; 2973 2974 if (!urgflag) 2975 return (0); 2976 urgflag = 0; 2977 /* only process if transfer occurring */ 2978 if (!transflag) 2979 return (0); 2980 cp = tmpline; 2981 ret = get_line(cp, sizeof(tmpline)-1, stdin); 2982 if (ret == -1) { 2983 reply(221, "You could at least say goodbye."); 2984 dologout(0); 2985 } else if (ret == -2) { 2986 /* Ignore truncated command */ 2987 /* XXX: abort xfer with "500 command too long", & return 1 ? */ 2988 return 0; 2989 } 2990 /* 2991 * Manually parse OOB commands, because we can't 2992 * recursively call the yacc parser... 2993 */ 2994 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2995 abor(); 2996 } else if (strcasecmp(cp, "STAT\r\n") == 0) { 2997 statxfer(); 2998 } else { 2999 /* XXX: error with "500 unknown command" ? */ 3000 } 3001 return (transflag == 0); 3002 } 3003 3004 static int 3005 bind_pasv_addr(void) 3006 { 3007 static int passiveport; 3008 int port, len; 3009 3010 len = pasv_addr.su_len; 3011 if (curclass.portmin == 0 && curclass.portmax == 0) { 3012 pasv_addr.su_port = 0; 3013 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 3014 } 3015 3016 if (passiveport == 0) { 3017 srand(getpid()); 3018 passiveport = rand() % (curclass.portmax - curclass.portmin) 3019 + curclass.portmin; 3020 } 3021 3022 port = passiveport; 3023 while (1) { 3024 port++; 3025 if (port > curclass.portmax) 3026 port = curclass.portmin; 3027 else if (port == passiveport) { 3028 errno = EAGAIN; 3029 return (-1); 3030 } 3031 pasv_addr.su_port = htons(port); 3032 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 3033 break; 3034 if (errno != EADDRINUSE) 3035 return (-1); 3036 } 3037 passiveport = port; 3038 return (0); 3039 } 3040 3041 /* 3042 * Note: a response of 425 is not mentioned as a possible response to 3043 * the PASV command in RFC959. However, it has been blessed as 3044 * a legitimate response by Jon Postel in a telephone conversation 3045 * with Rick Adams on 25 Jan 89. 3046 */ 3047 void 3048 passive(void) 3049 { 3050 socklen_t len; 3051 int recvbufsize; 3052 char *p, *a; 3053 3054 if (pdata >= 0) 3055 close(pdata); 3056 pdata = socket(AF_INET, SOCK_STREAM, 0); 3057 if (pdata < 0 || !logged_in) { 3058 perror_reply(425, "Can't open passive connection"); 3059 return; 3060 } 3061 pasv_addr = ctrl_addr; 3062 3063 if (bind_pasv_addr() < 0) 3064 goto pasv_error; 3065 len = pasv_addr.su_len; 3066 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 3067 goto pasv_error; 3068 pasv_addr.su_len = len; 3069 if (curclass.recvbufsize) { 3070 recvbufsize = curclass.recvbufsize; 3071 if (setsockopt(pdata, SOL_SOCKET, SO_RCVBUF, &recvbufsize, 3072 sizeof(int)) == -1) 3073 syslog(LOG_WARNING, "setsockopt(SO_RCVBUF, %d): %m", 3074 recvbufsize); 3075 } 3076 if (listen(pdata, 1) < 0) 3077 goto pasv_error; 3078 if (curclass.advertise.su_len != 0) 3079 a = (char *) &curclass.advertise.su_addr; 3080 else 3081 a = (char *) &pasv_addr.su_addr; 3082 p = (char *) &pasv_addr.su_port; 3083 3084 #define UC(b) (((int) b) & 0xff) 3085 3086 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 3087 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 3088 return; 3089 3090 pasv_error: 3091 (void) close(pdata); 3092 pdata = -1; 3093 perror_reply(425, "Can't open passive connection"); 3094 return; 3095 } 3096 3097 /* 3098 * convert protocol identifier to/from AF 3099 */ 3100 int 3101 lpsvproto2af(int proto) 3102 { 3103 3104 switch (proto) { 3105 case 4: 3106 return AF_INET; 3107 #ifdef INET6 3108 case 6: 3109 return AF_INET6; 3110 #endif 3111 default: 3112 return -1; 3113 } 3114 } 3115 3116 int 3117 af2lpsvproto(int af) 3118 { 3119 3120 switch (af) { 3121 case AF_INET: 3122 return 4; 3123 #ifdef INET6 3124 case AF_INET6: 3125 return 6; 3126 #endif 3127 default: 3128 return -1; 3129 } 3130 } 3131 3132 int 3133 epsvproto2af(int proto) 3134 { 3135 3136 switch (proto) { 3137 case 1: 3138 return AF_INET; 3139 #ifdef INET6 3140 case 2: 3141 return AF_INET6; 3142 #endif 3143 default: 3144 return -1; 3145 } 3146 } 3147 3148 int 3149 af2epsvproto(int af) 3150 { 3151 3152 switch (af) { 3153 case AF_INET: 3154 return 1; 3155 #ifdef INET6 3156 case AF_INET6: 3157 return 2; 3158 #endif 3159 default: 3160 return -1; 3161 } 3162 } 3163 3164 /* 3165 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 3166 * 229 Entering Extended Passive Mode (|||port|) 3167 */ 3168 void 3169 long_passive(const char *cmd, int pf) 3170 { 3171 socklen_t len; 3172 char *p, *a; 3173 3174 if (!logged_in) { 3175 syslog(LOG_NOTICE, "long passive but not logged in"); 3176 reply(503, "Login with USER first."); 3177 return; 3178 } 3179 3180 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 3181 /* 3182 * XXX: only EPRT/EPSV ready clients will understand this 3183 */ 3184 if (strcmp(cmd, "EPSV") != 0) 3185 reply(501, "Network protocol mismatch"); /*XXX*/ 3186 else 3187 epsv_protounsupp("Network protocol mismatch"); 3188 3189 return; 3190 } 3191 3192 if (pdata >= 0) 3193 close(pdata); 3194 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 3195 if (pdata < 0) { 3196 perror_reply(425, "Can't open passive connection"); 3197 return; 3198 } 3199 pasv_addr = ctrl_addr; 3200 if (bind_pasv_addr() < 0) 3201 goto pasv_error; 3202 len = pasv_addr.su_len; 3203 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 3204 goto pasv_error; 3205 pasv_addr.su_len = len; 3206 if (listen(pdata, 1) < 0) 3207 goto pasv_error; 3208 p = (char *) &pasv_addr.su_port; 3209 3210 #define UC(b) (((int) b) & 0xff) 3211 3212 if (strcmp(cmd, "LPSV") == 0) { 3213 struct sockinet *advert; 3214 3215 if (curclass.advertise.su_len != 0) 3216 advert = &curclass.advertise; 3217 else 3218 advert = &pasv_addr; 3219 switch (advert->su_family) { 3220 case AF_INET: 3221 a = (char *) &advert->su_addr; 3222 reply(228, 3223 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3224 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3225 2, UC(p[0]), UC(p[1])); 3226 return; 3227 #ifdef INET6 3228 case AF_INET6: 3229 a = (char *) &advert->su_6addr; 3230 reply(228, 3231 "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)", 3232 6, 16, 3233 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3234 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3235 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3236 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3237 2, UC(p[0]), UC(p[1])); 3238 return; 3239 #endif 3240 } 3241 #undef UC 3242 } else if (strcmp(cmd, "EPSV") == 0) { 3243 switch (pasv_addr.su_family) { 3244 case AF_INET: 3245 #ifdef INET6 3246 case AF_INET6: 3247 #endif 3248 reply(229, "Entering Extended Passive Mode (|||%d|)", 3249 ntohs(pasv_addr.su_port)); 3250 return; 3251 } 3252 } else { 3253 /* more proper error code? */ 3254 } 3255 3256 pasv_error: 3257 (void) close(pdata); 3258 pdata = -1; 3259 perror_reply(425, "Can't open passive connection"); 3260 return; 3261 } 3262 3263 int 3264 extended_port(const char *arg) 3265 { 3266 char *tmp = NULL; 3267 char *result[3]; 3268 char *p, *q; 3269 char delim; 3270 struct addrinfo hints; 3271 struct addrinfo *res = NULL; 3272 int i; 3273 unsigned long proto; 3274 3275 tmp = ftpd_strdup(arg); 3276 p = tmp; 3277 delim = p[0]; 3278 p++; 3279 memset(result, 0, sizeof(result)); 3280 for (i = 0; i < 3; i++) { 3281 q = strchr(p, delim); 3282 if (!q || *q != delim) 3283 goto parsefail; 3284 *q++ = '\0'; 3285 result[i] = p; 3286 p = q; 3287 } 3288 3289 /* some more sanity checks */ 3290 errno = 0; 3291 p = NULL; 3292 (void)strtoul(result[2], &p, 10); 3293 if (errno || !*result[2] || *p) 3294 goto parsefail; 3295 errno = 0; 3296 p = NULL; 3297 proto = strtoul(result[0], &p, 10); 3298 if (errno || !*result[0] || *p) 3299 goto protounsupp; 3300 3301 memset(&hints, 0, sizeof(hints)); 3302 hints.ai_family = epsvproto2af((int)proto); 3303 if (hints.ai_family < 0) 3304 goto protounsupp; 3305 hints.ai_socktype = SOCK_STREAM; 3306 hints.ai_flags = AI_NUMERICHOST; 3307 if (getaddrinfo(result[1], result[2], &hints, &res)) 3308 goto parsefail; 3309 if (res->ai_next) 3310 goto parsefail; 3311 if (sizeof(data_dest) < res->ai_addrlen) 3312 goto parsefail; 3313 memcpy(&data_dest.si_su, res->ai_addr, res->ai_addrlen); 3314 data_dest.su_len = res->ai_addrlen; 3315 #ifdef INET6 3316 if (his_addr.su_family == AF_INET6 && 3317 data_dest.su_family == AF_INET6) { 3318 /* XXX: more sanity checks! */ 3319 data_dest.su_scope_id = his_addr.su_scope_id; 3320 } 3321 #endif 3322 3323 if (tmp != NULL) 3324 free(tmp); 3325 if (res) 3326 freeaddrinfo(res); 3327 return 0; 3328 3329 parsefail: 3330 reply(500, "Invalid argument, rejected."); 3331 usedefault = 1; 3332 if (tmp != NULL) 3333 free(tmp); 3334 if (res) 3335 freeaddrinfo(res); 3336 return -1; 3337 3338 protounsupp: 3339 epsv_protounsupp("Protocol not supported"); 3340 usedefault = 1; 3341 if (tmp != NULL) 3342 free(tmp); 3343 return -1; 3344 } 3345 3346 /* 3347 * 522 Protocol not supported (proto,...) 3348 * as we assume address family for control and data connections are the same, 3349 * we do not return the list of address families we support - instead, we 3350 * return the address family of the control connection. 3351 */ 3352 void 3353 epsv_protounsupp(const char *message) 3354 { 3355 int proto; 3356 3357 proto = af2epsvproto(ctrl_addr.su_family); 3358 if (proto < 0) 3359 reply(501, "%s", message); /* XXX */ 3360 else 3361 reply(522, "%s, use (%d)", message, proto); 3362 } 3363 3364 /* 3365 * Generate unique name for file with basename "local". 3366 * The file named "local" is already known to exist. 3367 * Generates failure reply on error. 3368 * 3369 * XXX: this function should under go changes similar to 3370 * the mktemp(3)/mkstemp(3) changes. 3371 */ 3372 static char * 3373 gunique(const char *local) 3374 { 3375 static char new[MAXPATHLEN]; 3376 struct stat st; 3377 char *cp; 3378 int count; 3379 3380 cp = strrchr(local, '/'); 3381 if (cp) 3382 *cp = '\0'; 3383 if (stat(cp ? local : ".", &st) < 0) { 3384 perror_reply(553, cp ? local : "."); 3385 return (NULL); 3386 } 3387 if (cp) 3388 *cp = '/'; 3389 for (count = 1; count < 100; count++) { 3390 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 3391 if (stat(new, &st) < 0) 3392 return (new); 3393 } 3394 reply(452, "Unique file name cannot be created."); 3395 return (NULL); 3396 } 3397 3398 /* 3399 * Format and send reply containing system error number. 3400 */ 3401 void 3402 perror_reply(int code, const char *string) 3403 { 3404 int save_errno; 3405 3406 save_errno = errno; 3407 reply(code, "%s: %s.", string, strerror(errno)); 3408 errno = save_errno; 3409 } 3410 3411 static char *onefile[] = { 3412 NULL, 3413 0 3414 }; 3415 3416 void 3417 send_file_list(const char *whichf) 3418 { 3419 struct stat st; 3420 DIR *dirp; 3421 struct dirent *dir; 3422 FILE *volatile dout; 3423 char **volatile dirlist; 3424 char *dirname, *p; 3425 char *notglob; 3426 int volatile simple; 3427 int volatile freeglob; 3428 glob_t gl; 3429 3430 dirp = NULL; 3431 dout = NULL; 3432 notglob = NULL; 3433 simple = 0; 3434 freeglob = 0; 3435 urgflag = 0; 3436 3437 p = NULL; 3438 if (strpbrk(whichf, "~{[*?") != NULL) { 3439 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; 3440 3441 memset(&gl, 0, sizeof(gl)); 3442 freeglob = 1; 3443 if (glob(whichf, flags, 0, &gl)) { 3444 reply(450, "Not found"); 3445 goto cleanup_send_file_list; 3446 } else if (gl.gl_pathc == 0) { 3447 errno = ENOENT; 3448 perror_reply(450, whichf); 3449 goto cleanup_send_file_list; 3450 } 3451 dirlist = gl.gl_pathv; 3452 } else { 3453 notglob = ftpd_strdup(whichf); 3454 onefile[0] = notglob; 3455 dirlist = onefile; 3456 simple = 1; 3457 } 3458 /* XXX: } for vi sm */ 3459 3460 while ((dirname = *dirlist++) != NULL) { 3461 int trailingslash = 0; 3462 3463 if (stat(dirname, &st) < 0) { 3464 /* 3465 * If user typed "ls -l", etc, and the client 3466 * used NLST, do what the user meant. 3467 */ 3468 /* XXX: nuke this support? */ 3469 if (dirname[0] == '-' && *dirlist == NULL && 3470 transflag == 0) { 3471 const char *argv[] = { INTERNAL_LS, "", NULL }; 3472 3473 argv[1] = dirname; 3474 retrieve(argv, dirname); 3475 goto cleanup_send_file_list; 3476 } 3477 perror_reply(450, whichf); 3478 goto cleanup_send_file_list; 3479 } 3480 3481 if (S_ISREG(st.st_mode)) { 3482 /* 3483 * XXXRFC: 3484 * should we follow RFC959 and not work 3485 * for non directories? 3486 */ 3487 if (dout == NULL) { 3488 dout = dataconn("file list", (off_t)-1, "w"); 3489 if (dout == NULL) 3490 goto cleanup_send_file_list; 3491 transflag = 1; 3492 } 3493 cprintf(dout, "%s%s\n", dirname, 3494 type == TYPE_A ? "\r" : ""); 3495 continue; 3496 } else if (!S_ISDIR(st.st_mode)) 3497 continue; 3498 3499 if (dirname[strlen(dirname) - 1] == '/') 3500 trailingslash++; 3501 3502 if ((dirp = opendir(dirname)) == NULL) 3503 continue; 3504 3505 while ((dir = readdir(dirp)) != NULL) { 3506 char nbuf[MAXPATHLEN]; 3507 3508 if (urgflag && handleoobcmd()) { 3509 (void) closedir(dirp); 3510 goto cleanup_send_file_list; 3511 } 3512 3513 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 3514 continue; 3515 3516 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 3517 trailingslash ? "" : "/", dir->d_name); 3518 3519 /* 3520 * We have to do a stat to ensure it's 3521 * not a directory or special file. 3522 */ 3523 /* 3524 * XXXRFC: 3525 * should we follow RFC959 and filter out 3526 * non files ? lukem - NO!, or not until 3527 * our ftp client uses MLS{T,D} for completion. 3528 */ 3529 if (simple || (stat(nbuf, &st) == 0 && 3530 S_ISREG(st.st_mode))) { 3531 if (dout == NULL) { 3532 dout = dataconn("file list", (off_t)-1, 3533 "w"); 3534 if (dout == NULL) { 3535 (void) closedir(dirp); 3536 goto cleanup_send_file_list; 3537 } 3538 transflag = 1; 3539 } 3540 p = nbuf; 3541 if (nbuf[0] == '.' && nbuf[1] == '/') 3542 p = &nbuf[2]; 3543 cprintf(dout, "%s%s\n", p, 3544 type == TYPE_A ? "\r" : ""); 3545 } 3546 } 3547 (void) closedir(dirp); 3548 } 3549 3550 if (dout == NULL) 3551 reply(450, "No files found."); 3552 else if (ferror(dout) != 0) 3553 perror_reply(451, "Data connection"); 3554 else 3555 reply(226, "Transfer complete."); 3556 3557 cleanup_send_file_list: 3558 closedataconn(dout); 3559 transflag = 0; 3560 urgflag = 0; 3561 total_xfers++; 3562 total_xfers_out++; 3563 if (notglob) 3564 free(notglob); 3565 if (freeglob) 3566 globfree(&gl); 3567 } 3568 3569 char * 3570 conffilename(const char *s) 3571 { 3572 static char filename[MAXPATHLEN]; 3573 3574 if (*s == '/') 3575 strlcpy(filename, s, sizeof(filename)); 3576 else 3577 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 3578 return (filename); 3579 } 3580 3581 /* 3582 * logxfer -- 3583 * if logging > 1, then based on the arguments, syslog a message: 3584 * if bytes != -1 "<command> <file1> = <bytes> bytes" 3585 * else if file2 != NULL "<command> <file1> <file2>" 3586 * else "<command> <file1>" 3587 * if elapsed != NULL, append "in xxx.yyy seconds" 3588 * if error != NULL, append ": " + error 3589 * 3590 * if doxferlog != 0, bytes != -1, and command is "get", "put", 3591 * or "append", syslog and/or write a wu-ftpd style xferlog entry 3592 */ 3593 void 3594 logxfer(const char *command, off_t bytes, const char *file1, const char *file2, 3595 const struct timeval *elapsed, const char *error) 3596 { 3597 char buf[MAXPATHLEN * 2 + 100]; 3598 char realfile1[MAXPATHLEN], realfile2[MAXPATHLEN]; 3599 const char *r1, *r2; 3600 char direction; 3601 size_t len; 3602 time_t now; 3603 3604 if (logging <=1 && !doxferlog) 3605 return; 3606 3607 r1 = r2 = NULL; 3608 if ((r1 = realpath(file1, realfile1)) == NULL) 3609 r1 = file1; 3610 if (file2 != NULL) 3611 if ((r2 = realpath(file2, realfile2)) == NULL) 3612 r2 = file2; 3613 3614 /* 3615 * syslog command 3616 */ 3617 if (logging > 1) { 3618 len = snprintf(buf, sizeof(buf), "%s %s", command, r1); 3619 if (bytes != (off_t)-1) 3620 len += snprintf(buf + len, sizeof(buf) - len, 3621 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 3622 else if (r2 != NULL) 3623 len += snprintf(buf + len, sizeof(buf) - len, 3624 " %s", r2); 3625 if (elapsed != NULL) 3626 len += snprintf(buf + len, sizeof(buf) - len, 3627 " in " LLF ".%.03ld seconds", 3628 (LLT)elapsed->tv_sec, 3629 (long)(elapsed->tv_usec / 1000)); 3630 if (error != NULL) 3631 len += snprintf(buf + len, sizeof(buf) - len, 3632 ": %s", error); 3633 syslog(LOG_INFO, "%s", buf); 3634 } 3635 3636 /* 3637 * syslog wu-ftpd style log entry, prefixed with "xferlog: " 3638 */ 3639 if (!doxferlog || bytes == -1) 3640 return; 3641 3642 if (strcmp(command, "get") == 0) 3643 direction = 'o'; 3644 else if (strcmp(command, "put") == 0 || strcmp(command, "append") == 0) 3645 direction = 'i'; 3646 else 3647 return; 3648 3649 time(&now); 3650 len = snprintf(buf, sizeof(buf), 3651 "%.24s " LLF " %s " LLF " %s %c %s %c %c %s FTP 0 * %c\n", 3652 3653 /* 3654 * XXX: wu-ftpd puts ' (send)' or ' (recv)' in the syslog message, and removes 3655 * the full date. This may be problematic for accurate log parsing, 3656 * given that syslog messages don't contain the full date. 3657 */ 3658 ctime(&now), 3659 (LLT) 3660 (elapsed == NULL ? 0 : elapsed->tv_sec + (elapsed->tv_usec > 0)), 3661 remotehost, 3662 (LLT) bytes, 3663 r1, 3664 type == TYPE_A ? 'a' : 'b', 3665 "_", /* XXX: take conversions into account? */ 3666 direction, 3667 3668 curclass.type == CLASS_GUEST ? 'a' : 3669 curclass.type == CLASS_CHROOT ? 'g' : 3670 curclass.type == CLASS_REAL ? 'r' : '?', 3671 3672 curclass.type == CLASS_GUEST ? pw->pw_passwd : pw->pw_name, 3673 error != NULL ? 'i' : 'c' 3674 ); 3675 3676 if ((doxferlog & 2) && xferlogfd != -1) 3677 write(xferlogfd, buf, len); 3678 if ((doxferlog & 1)) { 3679 buf[len-1] = '\n'; /* strip \n from syslog message */ 3680 syslog(LOG_INFO, "xferlog: %s", buf); 3681 } 3682 } 3683 3684 /* 3685 * Log the resource usage. 3686 * 3687 * XXX: more resource usage to logging? 3688 */ 3689 void 3690 logrusage(const struct rusage *rusage_before, 3691 const struct rusage *rusage_after) 3692 { 3693 struct timeval usrtime, systime; 3694 3695 if (logging <= 1) 3696 return; 3697 3698 timersub(&rusage_after->ru_utime, &rusage_before->ru_utime, &usrtime); 3699 timersub(&rusage_after->ru_stime, &rusage_before->ru_stime, &systime); 3700 syslog(LOG_INFO, LLF ".%.03ldu " LLF ".%.03lds %ld+%ldio %ldpf+%ldw", 3701 (LLT)usrtime.tv_sec, (long)(usrtime.tv_usec / 1000), 3702 (LLT)systime.tv_sec, (long)(systime.tv_usec / 1000), 3703 rusage_after->ru_inblock - rusage_before->ru_inblock, 3704 rusage_after->ru_oublock - rusage_before->ru_oublock, 3705 rusage_after->ru_majflt - rusage_before->ru_majflt, 3706 rusage_after->ru_nswap - rusage_before->ru_nswap); 3707 } 3708 3709 /* 3710 * Determine if `password' is valid for user given in `pw'. 3711 * Returns 2 if password expired, 1 if otherwise failed, 0 if ok 3712 */ 3713 int 3714 checkpassword(const struct passwd *pwent, const char *password) 3715 { 3716 const char *orig; 3717 char *new; 3718 time_t change, expire, now; 3719 3720 change = expire = 0; 3721 if (pwent == NULL) 3722 return 1; 3723 3724 time(&now); 3725 orig = pwent->pw_passwd; /* save existing password */ 3726 expire = pwent->pw_expire; 3727 change = pwent->pw_change; 3728 if (change == _PASSWORD_CHGNOW) 3729 change = now; 3730 3731 if (orig[0] == '\0') /* don't allow empty passwords */ 3732 return 1; 3733 3734 new = crypt(password, orig); /* encrypt given password */ 3735 if (strcmp(new, orig) != 0) /* compare */ 3736 return 1; 3737 3738 if ((expire && now >= expire) || (change && now >= change)) 3739 return 2; /* check if expired */ 3740 3741 return 0; /* OK! */ 3742 } 3743 3744 char * 3745 ftpd_strdup(const char *s) 3746 { 3747 char *new = strdup(s); 3748 3749 if (new == NULL) 3750 fatal("Local resource failure: malloc"); 3751 /* NOTREACHED */ 3752 return (new); 3753 } 3754 3755 /* 3756 * As per fprintf(), but increment total_bytes and total_bytes_out, 3757 * by the appropriate amount. 3758 */ 3759 void 3760 cprintf(FILE *fd, const char *fmt, ...) 3761 { 3762 off_t b; 3763 va_list ap; 3764 3765 va_start(ap, fmt); 3766 b = vfprintf(fd, fmt, ap); 3767 va_end(ap); 3768 total_bytes += b; 3769 total_bytes_out += b; 3770 } 3771 3772 #ifdef USE_PAM 3773 /* 3774 * the following code is stolen from imap-uw PAM authentication module and 3775 * login.c 3776 */ 3777 typedef struct { 3778 const char *uname; /* user name */ 3779 int triedonce; /* if non-zero, tried before */ 3780 } ftpd_cred_t; 3781 3782 static int 3783 auth_conv(int num_msg, const struct pam_message **msg, 3784 struct pam_response **resp, void *appdata) 3785 { 3786 int i, ret; 3787 size_t n; 3788 ftpd_cred_t *cred = (ftpd_cred_t *) appdata; 3789 struct pam_response *myreply; 3790 char pbuf[FTP_BUFLEN]; 3791 3792 if (num_msg <= 0 || num_msg > PAM_MAX_NUM_MSG) 3793 return (PAM_CONV_ERR); 3794 myreply = calloc(num_msg, sizeof *myreply); 3795 if (myreply == NULL) 3796 return PAM_BUF_ERR; 3797 3798 for (i = 0; i < num_msg; i++) { 3799 myreply[i].resp_retcode = 0; 3800 myreply[i].resp = NULL; 3801 switch (msg[i]->msg_style) { 3802 case PAM_PROMPT_ECHO_ON: /* user */ 3803 myreply[i].resp = ftpd_strdup(cred->uname); 3804 /* PAM frees resp. */ 3805 break; 3806 case PAM_PROMPT_ECHO_OFF: /* authtok (password) */ 3807 /* 3808 * Only send a single 331 reply and 3809 * then expect a PASS. 3810 */ 3811 if (cred->triedonce) { 3812 syslog(LOG_ERR, 3813 "auth_conv: already performed PAM_PROMPT_ECHO_OFF"); 3814 goto fail; 3815 } 3816 cred->triedonce++; 3817 if (msg[i]->msg[0] == '\0') { 3818 (void)strlcpy(pbuf, "password", sizeof(pbuf)); 3819 } else { 3820 /* Uncapitalize msg */ 3821 (void)strlcpy(pbuf, msg[i]->msg, sizeof(pbuf)); 3822 if (isupper((unsigned char)pbuf[0])) 3823 pbuf[0] = tolower( 3824 (unsigned char)pbuf[0]); 3825 /* Remove trailing ':' and whitespace */ 3826 n = strlen(pbuf); 3827 while (n-- > 0) { 3828 if (isspace((unsigned char)pbuf[n]) || 3829 pbuf[n] == ':') 3830 pbuf[n] = '\0'; 3831 else 3832 break; 3833 } 3834 } 3835 /* Send reply, wait for a response. */ 3836 reply(331, "User %s accepted, provide %s.", 3837 cred->uname, pbuf); 3838 (void) alarm(curclass.timeout); 3839 ret = get_line(pbuf, sizeof(pbuf)-1, stdin); 3840 (void) alarm(0); 3841 if (ret == -1) { 3842 reply(221, "You could at least say goodbye."); 3843 dologout(0); 3844 } else if (ret == -2) { 3845 /* XXX: should we do this reply(-530, ..) ? */ 3846 reply(-530, "Command too long."); 3847 goto fail; 3848 } 3849 /* Ensure it is PASS */ 3850 if (strncasecmp(pbuf, "PASS ", 5) != 0) { 3851 syslog(LOG_ERR, 3852 "auth_conv: unexpected reply '%.4s'", pbuf); 3853 /* XXX: should we do this reply(-530, ..) ? */ 3854 reply(-530, "Unexpected reply '%.4s'.", pbuf); 3855 goto fail; 3856 } 3857 /* Strip CRLF from "PASS" reply */ 3858 n = strlen(pbuf); 3859 while (--n >= 5 && 3860 (pbuf[n] == '\r' || pbuf[n] == '\n')) 3861 pbuf[n] = '\0'; 3862 /* Copy password into reply */ 3863 myreply[i].resp = ftpd_strdup(pbuf+5); 3864 /* PAM frees resp. */ 3865 break; 3866 case PAM_TEXT_INFO: 3867 case PAM_ERROR_MSG: 3868 break; 3869 default: /* unknown message style */ 3870 goto fail; 3871 } 3872 } 3873 3874 *resp = myreply; 3875 return PAM_SUCCESS; 3876 3877 fail: 3878 free(myreply); 3879 *resp = NULL; 3880 return PAM_CONV_ERR; 3881 } 3882 3883 /* 3884 * Attempt to authenticate the user using PAM. Returns 0 if the user is 3885 * authenticated, or 1 if not authenticated. If some sort of PAM system 3886 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 3887 * function returns -1. This can be used as an indication that we should 3888 * fall back to a different authentication mechanism. 3889 * pw maybe be updated to a new user if PAM_USER changes from curname. 3890 */ 3891 static int 3892 auth_pam(void) 3893 { 3894 const char *tmpl_user; 3895 const void *item; 3896 int rval; 3897 int e; 3898 ftpd_cred_t auth_cred = { curname, 0 }; 3899 struct pam_conv conv = { &auth_conv, &auth_cred }; 3900 struct sockaddr_storage ss; 3901 3902 e = pam_start("ftpd", curname, &conv, &pamh); 3903 if (e != PAM_SUCCESS) { 3904 /* 3905 * In OpenPAM, it's OK to pass NULL to pam_strerror() 3906 * if context creation has failed in the first place. 3907 */ 3908 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 3909 return -1; 3910 } 3911 3912 e = pam_set_item(pamh, PAM_RHOST, remotehost); 3913 if (e != PAM_SUCCESS) { 3914 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 3915 pam_strerror(pamh, e)); 3916 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3917 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3918 } 3919 pamh = NULL; 3920 return -1; 3921 } 3922 3923 memset(&ss, 0, sizeof(ss)); 3924 memcpy(&ss, &his_addr.si_su, his_addr.su_len); 3925 e = pam_set_item(pamh, PAM_SOCKADDR, &ss); 3926 if (e != PAM_SUCCESS) { 3927 syslog(LOG_ERR, "pam_set_item(PAM_SOCKADDR): %s", 3928 pam_strerror(pamh, e)); 3929 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3930 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3931 } 3932 pamh = NULL; 3933 return -1; 3934 } 3935 3936 e = pam_authenticate(pamh, 0); 3937 if (ftpd_debug) 3938 syslog(LOG_DEBUG, "pam_authenticate: user '%s' returned %d", 3939 curname, e); 3940 switch (e) { 3941 case PAM_SUCCESS: 3942 /* 3943 * With PAM we support the concept of a "template" 3944 * user. The user enters a login name which is 3945 * authenticated by PAM, usually via a remote service 3946 * such as RADIUS or TACACS+. If authentication 3947 * succeeds, a different but related "template" name 3948 * is used for setting the credentials, shell, and 3949 * home directory. The name the user enters need only 3950 * exist on the remote authentication server, but the 3951 * template name must be present in the local password 3952 * database. 3953 * 3954 * This is supported by two various mechanisms in the 3955 * individual modules. However, from the application's 3956 * point of view, the template user is always passed 3957 * back as a changed value of the PAM_USER item. 3958 */ 3959 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 3960 PAM_SUCCESS) { 3961 tmpl_user = (const char *) item; 3962 if (pw == NULL 3963 || strcmp(pw->pw_name, tmpl_user) != 0) { 3964 pw = sgetpwnam(tmpl_user); 3965 if (ftpd_debug) 3966 syslog(LOG_DEBUG, 3967 "auth_pam: PAM changed " 3968 "user from '%s' to '%s'", 3969 curname, pw->pw_name); 3970 (void)strlcpy(curname, pw->pw_name, 3971 curname_len); 3972 } 3973 } else 3974 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 3975 pam_strerror(pamh, e)); 3976 rval = 0; 3977 break; 3978 3979 case PAM_AUTH_ERR: 3980 case PAM_USER_UNKNOWN: 3981 case PAM_MAXTRIES: 3982 rval = 1; 3983 break; 3984 3985 default: 3986 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 3987 rval = -1; 3988 break; 3989 } 3990 3991 if (rval == 0) { 3992 e = pam_acct_mgmt(pamh, 0); 3993 if (e != PAM_SUCCESS) { 3994 syslog(LOG_ERR, "pam_acct_mgmt: %s", 3995 pam_strerror(pamh, e)); 3996 rval = 1; 3997 } 3998 } 3999 4000 if (rval != 0) { 4001 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 4002 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 4003 } 4004 pamh = NULL; 4005 } 4006 return rval; 4007 } 4008 4009 #endif /* USE_PAM */ 4010
Indexes created Sat Sep 20 22:09:52 GMT 2025