1 /* $NetBSD: ftpd.c,v 1.194 2009/07/13 19:05:40 roy Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2009 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 1.194 2009/07/13 19:05:40 roy 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 #define GLOBAL 169 #include "extern.h" 170 #include "pathnames.h" 171 #include "version.h" 172 173 static sig_atomic_t transflag; 174 static sig_atomic_t urgflag; 175 176 int data; 177 int Dflag; 178 int sflag; 179 int stru; /* avoid C keyword */ 180 int mode; 181 int dataport; /* use specific data port */ 182 int dopidfile; /* maintain pid file */ 183 int doutmp; /* update utmp file */ 184 int dowtmp; /* update wtmp file */ 185 int doxferlog; /* syslog/write wu-ftpd style xferlog entries */ 186 int xferlogfd; /* fd to write wu-ftpd xferlog entries to */ 187 int getnameopts; /* flags for use with getname() */ 188 int dropprivs; /* if privileges should or have been dropped */ 189 int mapped; /* IPv4 connection on AF_INET6 socket */ 190 off_t file_size; 191 off_t byte_count; 192 static char ttyline[20]; 193 194 #ifdef USE_PAM 195 static int auth_pam(void); 196 pam_handle_t *pamh = NULL; 197 #endif 198 199 #ifdef SUPPORT_UTMP 200 static struct utmp utmp; /* for utmp */ 201 #endif 202 #ifdef SUPPORT_UTMPX 203 static struct utmpx utmpx; /* for utmpx */ 204 #endif 205 206 static const char *anondir = NULL; 207 static const char *confdir = _DEFAULT_CONFDIR; 208 209 static char *curname; /* current USER name */ 210 static size_t curname_len; /* length of curname (include NUL) */ 211 212 #if defined(KERBEROS) || defined(KERBEROS5) 213 int has_ccache = 0; 214 int notickets = 1; 215 char *krbtkfile_env = NULL; 216 char *tty = ttyline; 217 int login_krb5_forwardable_tgt = 0; 218 #endif 219 220 int epsvall = 0; 221 222 /* 223 * Timeout intervals for retrying connections 224 * to hosts that don't accept PORT cmds. This 225 * is a kludge, but given the problems with TCP... 226 */ 227 #define SWAITMAX 90 /* wait at most 90 seconds */ 228 #define SWAITINT 5 /* interval between retries */ 229 230 int swaitmax = SWAITMAX; 231 int swaitint = SWAITINT; 232 233 enum send_status { 234 SS_SUCCESS, 235 SS_ABORTED, /* transfer aborted */ 236 SS_NO_TRANSFER, /* no transfer made yet */ 237 SS_FILE_ERROR, /* file read error */ 238 SS_DATA_ERROR /* data send error */ 239 }; 240 241 static int bind_pasv_addr(void); 242 static int checkuser(const char *, const char *, int, int, char **); 243 static int checkaccess(const char *); 244 static int checkpassword(const struct passwd *, const char *); 245 static void do_pass(int, int, const char *); 246 static void end_login(void); 247 static FILE *getdatasock(const char *); 248 static char *gunique(const char *); 249 static void login_utmp(const char *, const char *, const char *, 250 struct sockinet *); 251 static void logremotehost(struct sockinet *); 252 static void lostconn(int); 253 static void toolong(int); 254 static void sigquit(int); 255 static void sigurg(int); 256 static int handleoobcmd(void); 257 static int receive_data(FILE *, FILE *); 258 static int send_data(FILE *, FILE *, const struct stat *, int); 259 static struct passwd *sgetpwnam(const char *); 260 static int write_data(int, char *, size_t, off_t *, struct timeval *, 261 int); 262 static enum send_status 263 send_data_with_read(int, int, const struct stat *, int); 264 static enum send_status 265 send_data_with_mmap(int, int, const struct stat *, int); 266 static void logrusage(const struct rusage *, const struct rusage *); 267 static void logout_utmp(void); 268 269 int main(int, char *[]); 270 271 #if defined(KERBEROS) 272 int klogin(struct passwd *, char *, char *, char *); 273 void kdestroy(void); 274 #endif 275 #if defined(KERBEROS5) 276 int k5login(struct passwd *, char *, char *, char *); 277 void k5destroy(void); 278 #endif 279 280 int 281 main(int argc, char *argv[]) 282 { 283 int ch, on = 1, tos, keepalive; 284 socklen_t addrlen; 285 #ifdef KERBEROS5 286 krb5_error_code kerror; 287 #endif 288 char *p; 289 const char *xferlogname = NULL; 290 long l; 291 struct sigaction sa; 292 sa_family_t af = AF_UNSPEC; 293 294 connections = 1; 295 ftpd_debug = 0; 296 logging = 0; 297 pdata = -1; 298 Dflag = 0; 299 sflag = 0; 300 dataport = 0; 301 dopidfile = 1; /* default: DO use a pid file to count users */ 302 doutmp = 0; /* default: Do NOT log to utmp */ 303 dowtmp = 1; /* default: DO log to wtmp */ 304 doxferlog = 0; /* default: Do NOT syslog xferlog */ 305 xferlogfd = -1; /* default: Do NOT write xferlog file */ 306 getnameopts = 0; /* default: xlate addrs to name */ 307 dropprivs = 0; 308 mapped = 0; 309 usedefault = 1; 310 emailaddr = NULL; 311 hostname[0] = '\0'; 312 homedir[0] = '\0'; 313 gidcount = 0; 314 is_oob = 0; 315 version = FTPD_VERSION; 316 317 /* 318 * LOG_NDELAY sets up the logging connection immediately, 319 * necessary for anonymous ftp's that chroot and can't do it later. 320 */ 321 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 322 323 while ((ch = getopt(argc, argv, 324 "46a:c:C:Dde:h:HlL:nP:qQrst:T:uUvV:wWX")) != -1) { 325 switch (ch) { 326 case '4': 327 af = AF_INET; 328 break; 329 330 case '6': 331 af = AF_INET6; 332 break; 333 334 case 'a': 335 anondir = optarg; 336 break; 337 338 case 'c': 339 confdir = optarg; 340 break; 341 342 case 'C': 343 if ((p = strchr(optarg, '@')) != NULL) { 344 *p++ = '\0'; 345 strlcpy(remotehost, p, MAXHOSTNAMELEN + 1); 346 if (inet_pton(AF_INET, p, 347 &his_addr.su_addr) == 1) { 348 his_addr.su_family = AF_INET; 349 his_addr.su_len = 350 sizeof(his_addr.si_su.su_sin); 351 #ifdef INET6 352 } else if (inet_pton(AF_INET6, p, 353 &his_addr.su_6addr) == 1) { 354 his_addr.su_family = AF_INET6; 355 his_addr.su_len = 356 sizeof(his_addr.si_su.su_sin6); 357 #endif 358 } else 359 his_addr.su_family = AF_UNSPEC; 360 } 361 pw = sgetpwnam(optarg); 362 exit(checkaccess(optarg) ? 0 : 1); 363 /* NOTREACHED */ 364 365 case 'D': 366 Dflag = 1; 367 break; 368 369 case 'd': 370 case 'v': /* deprecated */ 371 ftpd_debug = 1; 372 break; 373 374 case 'e': 375 emailaddr = optarg; 376 break; 377 378 case 'h': 379 strlcpy(hostname, optarg, sizeof(hostname)); 380 break; 381 382 case 'H': 383 if (gethostname(hostname, sizeof(hostname)) == -1) 384 hostname[0] = '\0'; 385 hostname[sizeof(hostname) - 1] = '\0'; 386 break; 387 388 case 'l': 389 logging++; /* > 1 == extra logging */ 390 break; 391 392 case 'L': 393 xferlogname = optarg; 394 break; 395 396 case 'n': 397 getnameopts = NI_NUMERICHOST; 398 break; 399 400 case 'P': 401 errno = 0; 402 p = NULL; 403 l = strtol(optarg, &p, 10); 404 if (errno || *optarg == '\0' || *p != '\0' || 405 l < IPPORT_RESERVED || 406 l > IPPORT_ANONMAX) { 407 syslog(LOG_WARNING, "Invalid dataport %s", 408 optarg); 409 dataport = 0; 410 } 411 dataport = (int)l; 412 break; 413 414 case 'q': 415 dopidfile = 1; 416 break; 417 418 case 'Q': 419 dopidfile = 0; 420 break; 421 422 case 'r': 423 dropprivs = 1; 424 break; 425 426 case 's': 427 sflag = 1; 428 break; 429 430 case 't': 431 case 'T': 432 syslog(LOG_WARNING, 433 "-%c has been deprecated in favour of ftpd.conf", 434 ch); 435 break; 436 437 case 'u': 438 doutmp = 1; 439 break; 440 441 case 'U': 442 doutmp = 0; 443 break; 444 445 case 'V': 446 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 447 version = NULL; 448 else 449 version = ftpd_strdup(optarg); 450 break; 451 452 case 'w': 453 dowtmp = 1; 454 break; 455 456 case 'W': 457 dowtmp = 0; 458 break; 459 460 case 'X': 461 doxferlog |= 1; 462 break; 463 464 default: 465 if (optopt == 'a' || optopt == 'C') 466 exit(1); 467 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 468 break; 469 } 470 } 471 if (EMPTYSTR(confdir)) 472 confdir = _DEFAULT_CONFDIR; 473 474 if (dowtmp) { 475 #ifdef SUPPORT_UTMPX 476 ftpd_initwtmpx(); 477 #endif 478 #ifdef SUPPORT_UTMP 479 ftpd_initwtmp(); 480 #endif 481 } 482 errno = 0; 483 l = sysconf(_SC_LOGIN_NAME_MAX); 484 if (l == -1 && errno != 0) { 485 syslog(LOG_ERR, "sysconf _SC_LOGIN_NAME_MAX: %m"); 486 exit(1); 487 } else if (l <= 0) { 488 syslog(LOG_WARNING, "using conservative LOGIN_NAME_MAX value"); 489 curname_len = _POSIX_LOGIN_NAME_MAX; 490 } else 491 curname_len = (size_t)l; 492 curname = malloc(curname_len); 493 if (curname == NULL) { 494 syslog(LOG_ERR, "malloc: %m"); 495 exit(1); 496 } 497 curname[0] = '\0'; 498 499 if (Dflag) { 500 int error, fd, i, n, *socks; 501 struct pollfd *fds; 502 struct addrinfo hints, *res, *res0; 503 504 if (daemon(1, 0) == -1) { 505 syslog(LOG_ERR, "failed to daemonize: %m"); 506 exit(1); 507 } 508 (void)memset(&sa, 0, sizeof(sa)); 509 sa.sa_handler = SIG_IGN; 510 sa.sa_flags = SA_NOCLDWAIT; 511 sigemptyset(&sa.sa_mask); 512 (void)sigaction(SIGCHLD, &sa, NULL); 513 514 (void)memset(&hints, 0, sizeof(hints)); 515 hints.ai_flags = AI_PASSIVE; 516 hints.ai_family = af; 517 hints.ai_socktype = SOCK_STREAM; 518 error = getaddrinfo(NULL, "ftp", &hints, &res0); 519 if (error) { 520 syslog(LOG_ERR, "getaddrinfo: %s", gai_strerror(error)); 521 exit(1); 522 } 523 524 for (n = 0, res = res0; res != NULL; res = res->ai_next) 525 n++; 526 if (n == 0) { 527 syslog(LOG_ERR, "no addresses available"); 528 exit(1); 529 } 530 socks = malloc(n * sizeof(int)); 531 fds = malloc(n * sizeof(struct pollfd)); 532 if (socks == NULL || fds == NULL) { 533 syslog(LOG_ERR, "malloc: %m"); 534 exit(1); 535 } 536 537 for (n = 0, res = res0; res != NULL; res = res->ai_next) { 538 socks[n] = socket(res->ai_family, res->ai_socktype, 539 res->ai_protocol); 540 if (socks[n] == -1) 541 continue; 542 (void)setsockopt(socks[n], SOL_SOCKET, SO_REUSEADDR, 543 &on, sizeof(on)); 544 if (bind(socks[n], res->ai_addr, res->ai_addrlen) 545 == -1) { 546 (void)close(socks[n]); 547 continue; 548 } 549 if (listen(socks[n], 12) == -1) { 550 (void)close(socks[n]); 551 continue; 552 } 553 554 fds[n].fd = socks[n]; 555 fds[n].events = POLLIN; 556 n++; 557 } 558 if (n == 0) { 559 syslog(LOG_ERR, "%m"); 560 exit(1); 561 } 562 freeaddrinfo(res0); 563 564 if (pidfile(NULL) == -1) 565 syslog(LOG_ERR, "failed to write a pid file: %m"); 566 567 for (;;) { 568 if (poll(fds, n, INFTIM) == -1) { 569 if (errno == EINTR) 570 continue; 571 syslog(LOG_ERR, "poll: %m"); 572 exit(1); 573 } 574 for (i = 0; i < n; i++) { 575 if (fds[i].revents & POLLIN) { 576 fd = accept(fds[i].fd, NULL, NULL); 577 if (fd == -1) { 578 syslog(LOG_ERR, "accept: %m"); 579 continue; 580 } 581 switch (fork()) { 582 case -1: 583 syslog(LOG_ERR, "fork: %m"); 584 break; 585 case 0: 586 goto child; 587 /* NOTREACHED */ 588 } 589 (void)close(fd); 590 } 591 } 592 } 593 child: 594 (void)dup2(fd, STDIN_FILENO); 595 (void)dup2(fd, STDOUT_FILENO); 596 (void)dup2(fd, STDERR_FILENO); 597 for (i = 0; i < n; i++) 598 (void)close(socks[i]); 599 } 600 601 memset((char *)&his_addr, 0, sizeof(his_addr)); 602 addrlen = sizeof(his_addr.si_su); 603 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 604 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 605 exit(1); 606 } 607 his_addr.su_len = addrlen; 608 memset((char *)&ctrl_addr, 0, sizeof(ctrl_addr)); 609 addrlen = sizeof(ctrl_addr.si_su); 610 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 611 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 612 exit(1); 613 } 614 ctrl_addr.su_len = addrlen; 615 #ifdef INET6 616 if (his_addr.su_family == AF_INET6 617 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 618 #if 1 619 /* 620 * IPv4 control connection arrived to AF_INET6 socket. 621 * I hate to do this, but this is the easiest solution. 622 * 623 * The assumption is untrue on SIIT environment. 624 */ 625 struct sockinet tmp_addr; 626 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 627 628 tmp_addr = his_addr; 629 memset(&his_addr, 0, sizeof(his_addr)); 630 his_addr.su_family = AF_INET; 631 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 632 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 633 sizeof(his_addr.su_addr)); 634 his_addr.su_port = tmp_addr.su_port; 635 636 tmp_addr = ctrl_addr; 637 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 638 ctrl_addr.su_family = AF_INET; 639 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 640 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 641 sizeof(ctrl_addr.su_addr)); 642 ctrl_addr.su_port = tmp_addr.su_port; 643 #else 644 while (fgets(line, sizeof(line), fd) != NULL) { 645 if ((cp = strchr(line, '\n')) != NULL) 646 *cp = '\0'; 647 reply(-530, "%s", line); 648 } 649 (void) fflush(stdout); 650 (void) fclose(fd); 651 reply(530, 652 "Connection from IPv4 mapped address is not supported."); 653 exit(0); 654 #endif 655 656 mapped = 1; 657 } else 658 #endif /* INET6 */ 659 mapped = 0; 660 #ifdef IP_TOS 661 if (!mapped && his_addr.su_family == AF_INET) { 662 tos = IPTOS_LOWDELAY; 663 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 664 sizeof(int)) < 0) 665 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 666 } 667 #endif 668 /* if the hostname hasn't been given, attempt to determine it */ 669 if (hostname[0] == '\0') { 670 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 671 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 672 getnameopts) != 0) 673 (void)gethostname(hostname, sizeof(hostname)); 674 hostname[sizeof(hostname) - 1] = '\0'; 675 } 676 677 /* set this here so klogin can use it... */ 678 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 679 680 (void) freopen(_PATH_DEVNULL, "w", stderr); 681 682 memset(&sa, 0, sizeof(sa)); 683 sa.sa_handler = SIG_DFL; 684 sa.sa_flags = SA_RESTART; 685 sigemptyset(&sa.sa_mask); 686 (void) sigaction(SIGCHLD, &sa, NULL); 687 688 sa.sa_handler = sigquit; 689 sa.sa_flags = SA_RESTART; 690 sigfillset(&sa.sa_mask); /* block all sigs in these handlers */ 691 (void) sigaction(SIGHUP, &sa, NULL); 692 (void) sigaction(SIGINT, &sa, NULL); 693 (void) sigaction(SIGQUIT, &sa, NULL); 694 (void) sigaction(SIGTERM, &sa, NULL); 695 sa.sa_handler = lostconn; 696 (void) sigaction(SIGPIPE, &sa, NULL); 697 sa.sa_handler = toolong; 698 (void) sigaction(SIGALRM, &sa, NULL); 699 sa.sa_handler = sigurg; 700 (void) sigaction(SIGURG, &sa, NULL); 701 702 /* Try to handle urgent data inline */ 703 #ifdef SO_OOBINLINE 704 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 705 syslog(LOG_WARNING, "setsockopt: %m"); 706 #endif 707 /* Set keepalives on the socket to detect dropped connections. */ 708 #ifdef SO_KEEPALIVE 709 keepalive = 1; 710 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 711 sizeof(int)) < 0) 712 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 713 #endif 714 715 #ifdef F_SETOWN 716 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 717 syslog(LOG_WARNING, "fcntl F_SETOWN: %m"); 718 #endif 719 logremotehost(&his_addr); 720 /* 721 * Set up default state 722 */ 723 data = -1; 724 type = TYPE_A; 725 form = FORM_N; 726 stru = STRU_F; 727 mode = MODE_S; 728 tmpline[0] = '\0'; 729 hasyyerrored = 0; 730 731 #ifdef KERBEROS5 732 kerror = krb5_init_context(&kcontext); 733 if (kerror) { 734 syslog(LOG_ERR, "%s when initializing Kerberos context", 735 error_message(kerror)); 736 exit(0); 737 } 738 #endif /* KERBEROS5 */ 739 740 init_curclass(); 741 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 742 curclass.type = CLASS_REAL; 743 744 /* If logins are disabled, print out the message. */ 745 if (display_file(_PATH_NOLOGIN, 530)) { 746 reply(530, "System not available."); 747 exit(0); 748 } 749 (void)display_file(conffilename(_NAME_FTPWELCOME), 220); 750 /* reply(220,) must follow */ 751 if (EMPTYSTR(version)) 752 reply(220, "%s FTP server ready.", hostname); 753 else 754 reply(220, "%s FTP server (%s) ready.", hostname, version); 755 756 if (xferlogname != NULL) { 757 xferlogfd = open(xferlogname, O_WRONLY | O_APPEND | O_CREAT, 758 0660); 759 if (xferlogfd == -1) 760 syslog(LOG_WARNING, "open xferlog `%s': %m", 761 xferlogname); 762 else 763 doxferlog |= 2; 764 } 765 766 ftp_loop(); 767 /* NOTREACHED */ 768 } 769 770 static void 771 lostconn(int signo __unused) 772 { 773 774 if (ftpd_debug) 775 syslog(LOG_DEBUG, "lost connection"); 776 dologout(1); 777 } 778 779 static void 780 toolong(int signo __unused) 781 { 782 783 /* XXXSIGRACE */ 784 reply(421, 785 "Timeout (" LLF " seconds): closing control connection.", 786 (LLT)curclass.timeout); 787 if (logging) 788 syslog(LOG_INFO, "User %s timed out after " LLF " seconds", 789 (pw ? pw->pw_name : "unknown"), (LLT)curclass.timeout); 790 dologout(1); 791 } 792 793 static void 794 sigquit(int signo) 795 { 796 797 if (ftpd_debug) 798 syslog(LOG_DEBUG, "got signal %d", signo); 799 dologout(1); 800 } 801 802 static void 803 sigurg(int signo __unused) 804 { 805 806 urgflag = 1; 807 } 808 809 810 /* 811 * Save the result of a getpwnam. Used for USER command, since 812 * the data returned must not be clobbered by any other command 813 * (e.g., globbing). 814 */ 815 static struct passwd * 816 sgetpwnam(const char *name) 817 { 818 static struct passwd save; 819 struct passwd *p; 820 821 if ((p = getpwnam(name)) == NULL) 822 return (p); 823 if (save.pw_name) { 824 free((char *)save.pw_name); 825 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 826 free((char *)save.pw_passwd); 827 free((char *)save.pw_gecos); 828 free((char *)save.pw_dir); 829 free((char *)save.pw_shell); 830 } 831 save = *p; 832 save.pw_name = ftpd_strdup(p->pw_name); 833 save.pw_passwd = ftpd_strdup(p->pw_passwd); 834 save.pw_gecos = ftpd_strdup(p->pw_gecos); 835 save.pw_dir = ftpd_strdup(p->pw_dir); 836 save.pw_shell = ftpd_strdup(p->pw_shell); 837 return (&save); 838 } 839 840 static int login_attempts; /* number of failed login attempts */ 841 static int askpasswd; /* had USER command, ask for PASSwd */ 842 static int permitted; /* USER permitted */ 843 844 /* 845 * USER command. 846 * Sets global passwd pointer pw if named account exists and is acceptable; 847 * sets askpasswd if a PASS command is expected. If logged in previously, 848 * need to reset state. If name is "ftp" or "anonymous", the name is not in 849 * _NAME_FTPUSERS, and ftp account exists, set guest and pw, then just return. 850 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 851 * requesting login privileges. Disallow anyone who does not have a standard 852 * shell as returned by getusershell(). Disallow anyone mentioned in the file 853 * _NAME_FTPUSERS to allow people such as root and uucp to be avoided. 854 */ 855 void 856 user(const char *name) 857 { 858 char *class; 859 #ifdef LOGIN_CAP 860 login_cap_t *lc = NULL; 861 #endif 862 #ifdef USE_PAM 863 int e; 864 #endif 865 866 class = NULL; 867 if (logged_in) { 868 switch (curclass.type) { 869 case CLASS_GUEST: 870 reply(530, "Can't change user from guest login."); 871 return; 872 case CLASS_CHROOT: 873 reply(530, "Can't change user from chroot user."); 874 return; 875 case CLASS_REAL: 876 if (dropprivs) { 877 reply(530, "Can't change user."); 878 return; 879 } 880 end_login(); 881 break; 882 default: 883 abort(); 884 } 885 } 886 887 #if defined(KERBEROS) 888 kdestroy(); 889 #endif 890 #if defined(KERBEROS5) 891 k5destroy(); 892 #endif 893 894 curclass.type = CLASS_REAL; 895 askpasswd = 0; 896 permitted = 0; 897 898 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 899 /* need `pw' setup for checkaccess() and checkuser () */ 900 if ((pw = sgetpwnam("ftp")) == NULL) 901 reply(530, "User %s unknown.", name); 902 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 903 reply(530, "User %s access denied.", name); 904 else { 905 curclass.type = CLASS_GUEST; 906 askpasswd = 1; 907 reply(331, 908 "Guest login ok, type your name as password."); 909 } 910 if (!askpasswd) { 911 if (logging) 912 syslog(LOG_NOTICE, 913 "ANONYMOUS FTP LOGIN REFUSED FROM %s", 914 remoteloghost); 915 end_login(); 916 goto cleanup_user; 917 } 918 name = "ftp"; 919 } else 920 pw = sgetpwnam(name); 921 922 strlcpy(curname, name, curname_len); 923 924 /* check user in /etc/ftpusers, and setup class */ 925 permitted = checkuser(_NAME_FTPUSERS, curname, 1, 0, &class); 926 927 /* check user in /etc/ftpchroot */ 928 #ifdef LOGIN_CAP 929 lc = login_getpwclass(pw); 930 #endif 931 if (checkuser(_NAME_FTPCHROOT, curname, 0, 0, NULL) 932 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 933 || login_getcapbool(lc, "ftp-chroot", 0) 934 #endif 935 ) { 936 if (curclass.type == CLASS_GUEST) { 937 syslog(LOG_NOTICE, 938 "Can't change guest user to chroot class; remove entry in %s", 939 _NAME_FTPCHROOT); 940 exit(1); 941 } 942 curclass.type = CLASS_CHROOT; 943 } 944 945 /* determine default class */ 946 if (class == NULL) { 947 switch (curclass.type) { 948 case CLASS_GUEST: 949 class = ftpd_strdup("guest"); 950 break; 951 case CLASS_CHROOT: 952 class = ftpd_strdup("chroot"); 953 break; 954 case CLASS_REAL: 955 class = ftpd_strdup("real"); 956 break; 957 default: 958 syslog(LOG_ERR, "unknown curclass.type %d; aborting", 959 curclass.type); 960 abort(); 961 } 962 } 963 /* parse ftpd.conf, setting up various parameters */ 964 parse_conf(class); 965 /* if not guest user, check for valid shell */ 966 if (pw == NULL) 967 permitted = 0; 968 else { 969 const char *cp, *shell; 970 971 if ((shell = pw->pw_shell) == NULL || *shell == 0) 972 shell = _PATH_BSHELL; 973 while ((cp = getusershell()) != NULL) 974 if (strcmp(cp, shell) == 0) 975 break; 976 endusershell(); 977 if (cp == NULL && curclass.type != CLASS_GUEST) 978 permitted = 0; 979 } 980 981 /* deny quickly (after USER not PASS) if requested */ 982 if (CURCLASS_FLAGS_ISSET(denyquick) && !permitted) { 983 reply(530, "User %s may not use FTP.", curname); 984 if (logging) 985 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 986 remoteloghost, curname); 987 end_login(); 988 goto cleanup_user; 989 } 990 991 /* if haven't asked yet (i.e, not anon), ask now */ 992 if (!askpasswd) { 993 askpasswd = 1; 994 #ifdef USE_PAM 995 e = auth_pam(); /* this does reply(331, ...) */ 996 do_pass(1, e, ""); 997 goto cleanup_user; 998 #else /* !USE_PAM */ 999 #ifdef SKEY 1000 if (skey_haskey(curname) == 0) { 1001 const char *myskey; 1002 1003 myskey = skey_keyinfo(curname); 1004 reply(331, "Password [ %s ] required for %s.", 1005 myskey ? myskey : "error getting challenge", 1006 curname); 1007 } else 1008 #endif 1009 reply(331, "Password required for %s.", curname); 1010 #endif /* !USE_PAM */ 1011 } 1012 1013 cleanup_user: 1014 #ifdef LOGIN_CAP 1015 login_close(lc); 1016 #endif 1017 /* 1018 * Delay before reading passwd after first failed 1019 * attempt to slow down passwd-guessing programs. 1020 */ 1021 if (login_attempts) 1022 sleep((unsigned) login_attempts); 1023 1024 if (class) 1025 free(class); 1026 } 1027 1028 /* 1029 * Determine whether something is to happen (allow access, chroot) 1030 * for a user. Each line is a shell-style glob followed by 1031 * `yes' or `no'. 1032 * 1033 * For backward compatibility, `allow' and `deny' are synonymns 1034 * for `yes' and `no', respectively. 1035 * 1036 * Each glob is matched against the username in turn, and the first 1037 * match found is used. If no match is found, the result is the 1038 * argument `def'. If a match is found but without and explicit 1039 * `yes'/`no', the result is the opposite of def. 1040 * 1041 * If the file doesn't exist at all, the result is the argument 1042 * `nofile' 1043 * 1044 * Any line starting with `#' is considered a comment and ignored. 1045 * 1046 * Returns 0 if the user is denied, or 1 if they are allowed. 1047 * 1048 * NOTE: needs struct passwd *pw setup before use. 1049 */ 1050 static int 1051 checkuser(const char *fname, const char *name, int def, int nofile, 1052 char **retclass) 1053 { 1054 FILE *fd; 1055 int retval; 1056 char *word, *perm, *class, *buf, *p; 1057 size_t len, line; 1058 1059 retval = def; 1060 if (retclass != NULL) 1061 *retclass = NULL; 1062 if ((fd = fopen(conffilename(fname), "r")) == NULL) 1063 return nofile; 1064 1065 line = 0; 1066 for (; 1067 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 1068 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 1069 free(buf), buf = NULL) { 1070 word = perm = class = NULL; 1071 p = buf; 1072 if (len < 1) 1073 continue; 1074 if (p[len - 1] == '\n') 1075 p[--len] = '\0'; 1076 if (EMPTYSTR(p)) 1077 continue; 1078 1079 NEXTWORD(p, word); 1080 NEXTWORD(p, perm); 1081 NEXTWORD(p, class); 1082 if (EMPTYSTR(word)) 1083 continue; 1084 if (!EMPTYSTR(class)) { 1085 if (strcasecmp(class, "all") == 0 || 1086 strcasecmp(class, "none") == 0) { 1087 syslog(LOG_WARNING, 1088 "%s line %d: illegal user-defined class `%s' - skipping entry", 1089 fname, (int)line, class); 1090 continue; 1091 } 1092 } 1093 1094 /* have a host specifier */ 1095 if ((p = strchr(word, '@')) != NULL) { 1096 unsigned char net[16], mask[16], *addr; 1097 int addrlen, bits, bytes, a; 1098 1099 *p++ = '\0'; 1100 /* check against network or CIDR */ 1101 memset(net, 0x00, sizeof(net)); 1102 if ((bits = inet_net_pton(his_addr.su_family, p, net, 1103 sizeof(net))) != -1) { 1104 #ifdef INET6 1105 if (his_addr.su_family == AF_INET) { 1106 #endif 1107 addrlen = 4; 1108 addr = (unsigned char *)&his_addr.su_addr; 1109 #ifdef INET6 1110 } else { 1111 addrlen = 16; 1112 addr = (unsigned char *)&his_addr.su_6addr; 1113 } 1114 #endif 1115 bytes = bits / 8; 1116 bits = bits % 8; 1117 if (bytes > 0) 1118 memset(mask, 0xFF, bytes); 1119 if (bytes < addrlen) 1120 mask[bytes] = 0xFF << (8 - bits); 1121 if (bytes + 1 < addrlen) 1122 memset(mask + bytes + 1, 0x00, 1123 addrlen - bytes - 1); 1124 for (a = 0; a < addrlen; a++) 1125 if ((addr[a] & mask[a]) != net[a]) 1126 break; 1127 if (a < addrlen) 1128 continue; 1129 1130 /* check against hostname glob */ 1131 } else if (fnmatch(p, remotehost, FNM_CASEFOLD) != 0) 1132 continue; 1133 } 1134 1135 /* have a group specifier */ 1136 if ((p = strchr(word, ':')) != NULL) { 1137 gid_t *groups, *ng; 1138 int gsize, i, found; 1139 1140 if (pw == NULL) 1141 continue; /* no match for unknown user */ 1142 *p++ = '\0'; 1143 groups = NULL; 1144 gsize = 16; 1145 do { 1146 ng = realloc(groups, gsize * sizeof(gid_t)); 1147 if (ng == NULL) 1148 fatal( 1149 "Local resource failure: realloc"); 1150 groups = ng; 1151 } while (getgrouplist(pw->pw_name, pw->pw_gid, 1152 groups, &gsize) == -1); 1153 found = 0; 1154 for (i = 0; i < gsize; i++) { 1155 struct group *g; 1156 1157 if ((g = getgrgid(groups[i])) == NULL) 1158 continue; 1159 if (fnmatch(p, g->gr_name, 0) == 0) { 1160 found = 1; 1161 break; 1162 } 1163 } 1164 free(groups); 1165 if (!found) 1166 continue; 1167 } 1168 1169 /* check against username glob */ 1170 if (fnmatch(word, name, 0) != 0) 1171 continue; 1172 1173 if (perm != NULL && 1174 ((strcasecmp(perm, "allow") == 0) || 1175 (strcasecmp(perm, "yes") == 0))) 1176 retval = 1; 1177 else if (perm != NULL && 1178 ((strcasecmp(perm, "deny") == 0) || 1179 (strcasecmp(perm, "no") == 0))) 1180 retval = 0; 1181 else 1182 retval = !def; 1183 if (!EMPTYSTR(class) && retclass != NULL) 1184 *retclass = ftpd_strdup(class); 1185 free(buf); 1186 break; 1187 } 1188 (void) fclose(fd); 1189 return (retval); 1190 } 1191 1192 /* 1193 * Check if user is allowed by /etc/ftpusers 1194 * returns 1 for yes, 0 for no 1195 * 1196 * NOTE: needs struct passwd *pw setup (for checkuser()) 1197 */ 1198 static int 1199 checkaccess(const char *name) 1200 { 1201 1202 return (checkuser(_NAME_FTPUSERS, name, 1, 0, NULL)); 1203 } 1204 1205 static void 1206 login_utmp(const char *line, const char *name, const char *host, 1207 struct sockinet *haddr) 1208 { 1209 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 1210 struct timeval tv; 1211 (void)gettimeofday(&tv, NULL); 1212 #endif 1213 #ifdef SUPPORT_UTMPX 1214 if (doutmp) { 1215 (void)memset(&utmpx, 0, sizeof(utmpx)); 1216 utmpx.ut_tv = tv; 1217 utmpx.ut_pid = getpid(); 1218 utmpx.ut_id[0] = 'f'; 1219 utmpx.ut_id[1] = 't'; 1220 utmpx.ut_id[2] = 'p'; 1221 utmpx.ut_id[3] = '*'; 1222 utmpx.ut_type = USER_PROCESS; 1223 (void)strncpy(utmpx.ut_name, name, sizeof(utmpx.ut_name)); 1224 (void)strncpy(utmpx.ut_line, line, sizeof(utmpx.ut_line)); 1225 (void)strncpy(utmpx.ut_host, host, sizeof(utmpx.ut_host)); 1226 (void)memcpy(&utmpx.ut_ss, &haddr->si_su, haddr->su_len); 1227 ftpd_loginx(&utmpx); 1228 } 1229 if (dowtmp) 1230 ftpd_logwtmpx(line, name, host, haddr, 0, USER_PROCESS); 1231 #endif 1232 #ifdef SUPPORT_UTMP 1233 if (doutmp) { 1234 (void)memset(&utmp, 0, sizeof(utmp)); 1235 (void)time(&utmp.ut_time); 1236 (void)strncpy(utmp.ut_name, name, sizeof(utmp.ut_name)); 1237 (void)strncpy(utmp.ut_line, line, sizeof(utmp.ut_line)); 1238 (void)strncpy(utmp.ut_host, host, sizeof(utmp.ut_host)); 1239 ftpd_login(&utmp); 1240 } 1241 if (dowtmp) 1242 ftpd_logwtmp(line, name, host); 1243 #endif 1244 } 1245 1246 static void 1247 logout_utmp(void) 1248 { 1249 #ifdef SUPPORT_UTMPX 1250 int okwtmpx = dowtmp; 1251 #endif 1252 #ifdef SUPPORT_UTMP 1253 int okwtmp = dowtmp; 1254 #endif 1255 if (logged_in) { 1256 #ifdef SUPPORT_UTMPX 1257 if (doutmp) 1258 okwtmpx &= ftpd_logoutx(ttyline, 0, DEAD_PROCESS); 1259 if (okwtmpx) 1260 ftpd_logwtmpx(ttyline, "", "", NULL, 0, DEAD_PROCESS); 1261 #endif 1262 #ifdef SUPPORT_UTMP 1263 if (doutmp) 1264 okwtmp &= ftpd_logout(ttyline); 1265 if (okwtmp) 1266 ftpd_logwtmp(ttyline, "", ""); 1267 #endif 1268 } 1269 } 1270 1271 /* 1272 * Terminate login as previous user (if any), resetting state; 1273 * used when USER command is given or login fails. 1274 */ 1275 static void 1276 end_login(void) 1277 { 1278 #ifdef USE_PAM 1279 int e; 1280 #endif 1281 logout_utmp(); 1282 show_chdir_messages(-1); /* flush chdir cache */ 1283 if (pw != NULL && pw->pw_passwd != NULL) 1284 memset(pw->pw_passwd, 0, strlen(pw->pw_passwd)); 1285 pw = NULL; 1286 logged_in = 0; 1287 askpasswd = 0; 1288 permitted = 0; 1289 quietmessages = 0; 1290 gidcount = 0; 1291 curclass.type = CLASS_REAL; 1292 (void) seteuid((uid_t)0); 1293 #ifdef LOGIN_CAP 1294 setusercontext(NULL, getpwuid(0), 0, 1295 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1296 #endif 1297 #ifdef USE_PAM 1298 if (pamh) { 1299 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1300 syslog(LOG_ERR, "pam_setcred: %s", 1301 pam_strerror(pamh, e)); 1302 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1303 syslog(LOG_ERR, "pam_close_session: %s", 1304 pam_strerror(pamh, e)); 1305 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1306 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1307 pamh = NULL; 1308 } 1309 #endif 1310 } 1311 1312 void 1313 pass(const char *passwd) 1314 { 1315 do_pass(0, 0, passwd); 1316 } 1317 1318 /* 1319 * Perform the passwd confirmation and login. 1320 * 1321 * If pass_checked is zero, confirm passwd is correct, & ignore pass_rval. 1322 * This is the traditional PASS implementation. 1323 * 1324 * If pass_checked is non-zero, use pass_rval and ignore passwd. 1325 * This is used by auth_pam() which has already parsed PASS. 1326 * This only applies to curclass.type != CLASS_GUEST. 1327 */ 1328 static void 1329 do_pass(int pass_checked, int pass_rval, const char *passwd) 1330 { 1331 int rval; 1332 char root[MAXPATHLEN]; 1333 #ifdef LOGIN_CAP 1334 login_cap_t *lc = NULL; 1335 #endif 1336 #ifdef USE_PAM 1337 int e; 1338 #endif 1339 1340 rval = 1; 1341 1342 if (logged_in || askpasswd == 0) { 1343 reply(503, "Login with USER first."); 1344 return; 1345 } 1346 askpasswd = 0; 1347 if (curclass.type != CLASS_GUEST) { 1348 /* "ftp" is the only account allowed with no password */ 1349 if (pw == NULL) { 1350 rval = 1; /* failure below */ 1351 goto skip; 1352 } 1353 if (pass_checked) { /* password validated in user() */ 1354 rval = pass_rval; 1355 goto skip; 1356 } 1357 #ifdef USE_PAM 1358 syslog(LOG_ERR, "do_pass: USE_PAM shouldn't get here"); 1359 rval = 1; 1360 goto skip; 1361 #endif 1362 #if defined(KERBEROS) 1363 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 1364 rval = 0; 1365 goto skip; 1366 } 1367 #endif 1368 #if defined(KERBEROS5) 1369 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 1370 rval = 0; 1371 goto skip; 1372 } 1373 #endif 1374 #ifdef SKEY 1375 if (skey_haskey(pw->pw_name) == 0) { 1376 char *p; 1377 int r; 1378 1379 p = ftpd_strdup(passwd); 1380 r = skey_passcheck(pw->pw_name, p); 1381 free(p); 1382 if (r != -1) { 1383 rval = 0; 1384 goto skip; 1385 } 1386 } 1387 #endif 1388 if (!sflag) 1389 rval = checkpassword(pw, passwd); 1390 else 1391 rval = 1; 1392 1393 skip: 1394 1395 /* 1396 * If rval > 0, the user failed the authentication check 1397 * above. If rval == 0, either Kerberos or local 1398 * authentication succeeded. 1399 */ 1400 if (rval) { 1401 reply(530, "%s", rval == 2 ? "Password expired." : 1402 "Login incorrect."); 1403 if (logging) { 1404 syslog(LOG_NOTICE, 1405 "FTP LOGIN FAILED FROM %s", remoteloghost); 1406 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1407 "FTP LOGIN FAILED FROM %s, %s", 1408 remoteloghost, curname); 1409 } 1410 pw = NULL; 1411 if (login_attempts++ >= 5) { 1412 syslog(LOG_NOTICE, 1413 "repeated login failures from %s", 1414 remoteloghost); 1415 exit(0); 1416 } 1417 return; 1418 } 1419 } 1420 1421 /* password ok; check if anything else prevents login */ 1422 if (! permitted) { 1423 reply(530, "User %s may not use FTP.", pw->pw_name); 1424 if (logging) 1425 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 1426 remoteloghost, pw->pw_name); 1427 goto bad; 1428 } 1429 1430 login_attempts = 0; /* this time successful */ 1431 if (setegid((gid_t)pw->pw_gid) < 0) { 1432 reply(550, "Can't set gid."); 1433 goto bad; 1434 } 1435 #ifdef LOGIN_CAP 1436 if ((lc = login_getpwclass(pw)) != NULL) { 1437 #ifdef notyet 1438 char remote_ip[NI_MAXHOST]; 1439 1440 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1441 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1442 NI_NUMERICHOST)) 1443 *remote_ip = 0; 1444 remote_ip[sizeof(remote_ip) - 1] = 0; 1445 if (!auth_hostok(lc, remotehost, remote_ip)) { 1446 syslog(LOG_INFO|LOG_AUTH, 1447 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1448 pw->pw_name); 1449 reply(530, "Permission denied."); 1450 pw = NULL; 1451 return; 1452 } 1453 if (!auth_timeok(lc, time(NULL))) { 1454 reply(530, "Login not available right now."); 1455 pw = NULL; 1456 return; 1457 } 1458 #endif 1459 } 1460 setsid(); 1461 setusercontext(lc, pw, 0, 1462 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1463 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1464 #else 1465 (void) initgroups(pw->pw_name, pw->pw_gid); 1466 /* cache groups for cmds.c::matchgroup() */ 1467 #endif 1468 #ifdef USE_PAM 1469 if (pamh) { 1470 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1471 syslog(LOG_ERR, "pam_open_session: %s", 1472 pam_strerror(pamh, e)); 1473 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) 1474 != PAM_SUCCESS) { 1475 syslog(LOG_ERR, "pam_setcred: %s", 1476 pam_strerror(pamh, e)); 1477 } 1478 } 1479 #endif 1480 gidcount = getgroups(0, NULL); 1481 if (gidlist) 1482 free(gidlist); 1483 gidlist = malloc(gidcount * sizeof *gidlist); 1484 gidcount = getgroups(gidcount, gidlist); 1485 1486 /* open utmp/wtmp before chroot */ 1487 login_utmp(ttyline, pw->pw_name, remotehost, &his_addr); 1488 1489 logged_in = 1; 1490 1491 connections = 1; 1492 if (dopidfile) 1493 count_users(); 1494 if (curclass.limit != -1 && connections > curclass.limit) { 1495 if (! EMPTYSTR(curclass.limitfile)) 1496 (void)display_file(conffilename(curclass.limitfile), 1497 530); 1498 reply(530, 1499 "User %s access denied, connection limit of " LLF 1500 " reached.", 1501 pw->pw_name, (LLT)curclass.limit); 1502 syslog(LOG_NOTICE, 1503 "Maximum connection limit of " LLF 1504 " for class %s reached, login refused for %s", 1505 (LLT)curclass.limit, curclass.classname, pw->pw_name); 1506 goto bad; 1507 } 1508 1509 homedir[0] = '/'; 1510 switch (curclass.type) { 1511 case CLASS_GUEST: 1512 /* 1513 * We MUST do a chdir() after the chroot. Otherwise 1514 * the old current directory will be accessible as "." 1515 * outside the new root! 1516 */ 1517 format_path(root, 1518 curclass.chroot ? curclass.chroot : 1519 anondir ? anondir : 1520 pw->pw_dir); 1521 format_path(homedir, 1522 curclass.homedir ? curclass.homedir : 1523 "/"); 1524 if (EMPTYSTR(homedir)) 1525 homedir[0] = '/'; 1526 if (EMPTYSTR(root) || chroot(root) < 0) { 1527 syslog(LOG_NOTICE, 1528 "GUEST user %s: can't chroot to %s: %m", 1529 pw->pw_name, root); 1530 goto bad_guest; 1531 } 1532 if (chdir(homedir) < 0) { 1533 syslog(LOG_NOTICE, 1534 "GUEST user %s: can't chdir to %s: %m", 1535 pw->pw_name, homedir); 1536 bad_guest: 1537 reply(550, "Can't set guest privileges."); 1538 goto bad; 1539 } 1540 break; 1541 case CLASS_CHROOT: 1542 format_path(root, 1543 curclass.chroot ? curclass.chroot : 1544 pw->pw_dir); 1545 format_path(homedir, 1546 curclass.homedir ? curclass.homedir : 1547 "/"); 1548 if (EMPTYSTR(homedir)) 1549 homedir[0] = '/'; 1550 if (EMPTYSTR(root) || chroot(root) < 0) { 1551 syslog(LOG_NOTICE, 1552 "CHROOT user %s: can't chroot to %s: %m", 1553 pw->pw_name, root); 1554 goto bad_chroot; 1555 } 1556 if (chdir(homedir) < 0) { 1557 syslog(LOG_NOTICE, 1558 "CHROOT user %s: can't chdir to %s: %m", 1559 pw->pw_name, homedir); 1560 bad_chroot: 1561 reply(550, "Can't change root."); 1562 goto bad; 1563 } 1564 break; 1565 case CLASS_REAL: 1566 /* only chroot REAL if explicitly requested */ 1567 if (! EMPTYSTR(curclass.chroot)) { 1568 format_path(root, curclass.chroot); 1569 if (EMPTYSTR(root) || chroot(root) < 0) { 1570 syslog(LOG_NOTICE, 1571 "REAL user %s: can't chroot to %s: %m", 1572 pw->pw_name, root); 1573 goto bad_chroot; 1574 } 1575 } 1576 format_path(homedir, 1577 curclass.homedir ? curclass.homedir : 1578 pw->pw_dir); 1579 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1580 if (chdir("/") < 0) { 1581 syslog(LOG_NOTICE, 1582 "REAL user %s: can't chdir to %s: %m", 1583 pw->pw_name, 1584 !EMPTYSTR(homedir) ? homedir : "/"); 1585 reply(530, 1586 "User %s: can't change directory to %s.", 1587 pw->pw_name, 1588 !EMPTYSTR(homedir) ? homedir : "/"); 1589 goto bad; 1590 } else { 1591 reply(-230, 1592 "No directory! Logging in with home=/"); 1593 homedir[0] = '/'; 1594 } 1595 } 1596 break; 1597 } 1598 #ifndef LOGIN_CAP 1599 setsid(); 1600 setlogin(pw->pw_name); 1601 #endif 1602 if (dropprivs || 1603 (curclass.type != CLASS_REAL && 1604 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1605 dropprivs++; 1606 if (setgid((gid_t)pw->pw_gid) < 0) { 1607 reply(550, "Can't set gid."); 1608 goto bad; 1609 } 1610 if (setuid((uid_t)pw->pw_uid) < 0) { 1611 reply(550, "Can't set uid."); 1612 goto bad; 1613 } 1614 } else { 1615 if (seteuid((uid_t)pw->pw_uid) < 0) { 1616 reply(550, "Can't set uid."); 1617 goto bad; 1618 } 1619 } 1620 setenv("HOME", homedir, 1); 1621 1622 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1623 quietmessages = 1; 1624 1625 /* 1626 * Display a login message, if it exists. 1627 * N.B. reply(230,) must follow the message. 1628 */ 1629 if (! EMPTYSTR(curclass.motd)) 1630 (void)display_file(conffilename(curclass.motd), 230); 1631 show_chdir_messages(230); 1632 if (curclass.type == CLASS_GUEST) { 1633 char *p; 1634 1635 reply(230, "Guest login ok, access restrictions apply."); 1636 #if defined(HAVE_SETPROCTITLE) 1637 snprintf(proctitle, sizeof(proctitle), 1638 "%s: anonymous/%s", remotehost, passwd); 1639 setproctitle("%s", proctitle); 1640 #endif /* defined(HAVE_SETPROCTITLE) */ 1641 if (logging) 1642 syslog(LOG_INFO, 1643 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1644 remoteloghost, passwd, 1645 curclass.classname, CURCLASSTYPE); 1646 /* store guest password reply into pw_passwd */ 1647 REASSIGN(pw->pw_passwd, ftpd_strdup(passwd)); 1648 for (p = pw->pw_passwd; *p; p++) 1649 if (!isgraph((unsigned char)*p)) 1650 *p = '_'; 1651 } else { 1652 reply(230, "User %s logged in.", pw->pw_name); 1653 #if defined(HAVE_SETPROCTITLE) 1654 snprintf(proctitle, sizeof(proctitle), 1655 "%s: %s", remotehost, pw->pw_name); 1656 setproctitle("%s", proctitle); 1657 #endif /* defined(HAVE_SETPROCTITLE) */ 1658 if (logging) 1659 syslog(LOG_INFO, 1660 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1661 remoteloghost, pw->pw_name, 1662 curclass.classname, CURCLASSTYPE); 1663 } 1664 (void) umask(curclass.umask); 1665 #ifdef LOGIN_CAP 1666 login_close(lc); 1667 #endif 1668 return; 1669 1670 bad: 1671 #ifdef LOGIN_CAP 1672 login_close(lc); 1673 #endif 1674 /* Forget all about it... */ 1675 end_login(); 1676 } 1677 1678 void 1679 retrieve(const char *argv[], const char *name) 1680 { 1681 FILE *fin, *dout; 1682 struct stat st; 1683 int (*closefunc)(FILE *) = NULL; 1684 int dolog, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1685 struct timeval start, finish, td, *tdp; 1686 struct rusage rusage_before, rusage_after; 1687 const char *dispname; 1688 const char *error; 1689 1690 sendrv = closerv = stderrfd = -1; 1691 isconversion = isdata = isls = dolog = 0; 1692 tdp = NULL; 1693 dispname = name; 1694 fin = dout = NULL; 1695 error = NULL; 1696 if (argv == NULL) { /* if not running a command ... */ 1697 dolog = 1; 1698 isdata = 1; 1699 fin = fopen(name, "r"); 1700 closefunc = fclose; 1701 if (fin == NULL) /* doesn't exist?; try a conversion */ 1702 argv = do_conversion(name); 1703 if (argv != NULL) { 1704 isconversion++; 1705 syslog(LOG_DEBUG, "get command: '%s' on '%s'", 1706 argv[0], name); 1707 } 1708 } 1709 if (argv != NULL) { 1710 char temp[MAXPATHLEN]; 1711 1712 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1713 isls = 1; 1714 stderrfd = -1; 1715 } else { 1716 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1717 stderrfd = mkstemp(temp); 1718 if (stderrfd != -1) 1719 (void)unlink(temp); 1720 } 1721 dispname = argv[0]; 1722 fin = ftpd_popen(argv, "r", stderrfd); 1723 closefunc = ftpd_pclose; 1724 st.st_size = -1; 1725 st.st_blksize = BUFSIZ; 1726 } 1727 if (fin == NULL) { 1728 if (errno != 0) { 1729 perror_reply(550, dispname); 1730 if (dolog) 1731 logxfer("get", -1, name, NULL, NULL, 1732 strerror(errno)); 1733 } 1734 goto cleanupretrieve; 1735 } 1736 byte_count = -1; 1737 if (argv == NULL 1738 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1739 error = "Not a plain file"; 1740 reply(550, "%s: %s.", dispname, error); 1741 goto done; 1742 } 1743 if (restart_point) { 1744 if (type == TYPE_A) { 1745 off_t i; 1746 int c; 1747 1748 for (i = 0; i < restart_point; i++) { 1749 if ((c=getc(fin)) == EOF) { 1750 error = strerror(errno); 1751 perror_reply(550, dispname); 1752 goto done; 1753 } 1754 if (c == '\n') 1755 i++; 1756 } 1757 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1758 error = strerror(errno); 1759 perror_reply(550, dispname); 1760 goto done; 1761 } 1762 } 1763 dout = dataconn(dispname, st.st_size, "w"); 1764 if (dout == NULL) 1765 goto done; 1766 1767 (void)getrusage(RUSAGE_SELF, &rusage_before); 1768 (void)gettimeofday(&start, NULL); 1769 sendrv = send_data(fin, dout, &st, isdata); 1770 (void)gettimeofday(&finish, NULL); 1771 (void)getrusage(RUSAGE_SELF, &rusage_after); 1772 closedataconn(dout); /* close now to affect timing stats */ 1773 timersub(&finish, &start, &td); 1774 tdp = &td; 1775 done: 1776 if (dolog) { 1777 logxfer("get", byte_count, name, NULL, tdp, error); 1778 if (tdp != NULL) 1779 logrusage(&rusage_before, &rusage_after); 1780 } 1781 closerv = (*closefunc)(fin); 1782 if (sendrv == 0) { 1783 FILE *errf; 1784 struct stat sb; 1785 1786 if (!isls && argv != NULL && closerv != 0) { 1787 reply(-226, 1788 "Command returned an exit status of %d", 1789 closerv); 1790 if (isconversion) 1791 syslog(LOG_WARNING, 1792 "retrieve command: '%s' returned %d", 1793 argv[0], closerv); 1794 } 1795 if (!isls && argv != NULL && stderrfd != -1 && 1796 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1797 ((errf = fdopen(stderrfd, "r")) != NULL)) { 1798 char *cp, line[LINE_MAX]; 1799 1800 reply(-226, "Command error messages:"); 1801 rewind(errf); 1802 while (fgets(line, sizeof(line), errf) != NULL) { 1803 if ((cp = strchr(line, '\n')) != NULL) 1804 *cp = '\0'; 1805 reply(0, " %s", line); 1806 } 1807 (void) fflush(stdout); 1808 (void) fclose(errf); 1809 /* a reply(226,) must follow */ 1810 } 1811 reply(226, "Transfer complete."); 1812 } 1813 cleanupretrieve: 1814 if (stderrfd != -1) 1815 (void)close(stderrfd); 1816 if (isconversion) 1817 free(argv); 1818 } 1819 1820 void 1821 store(const char *name, const char *fmode, int unique) 1822 { 1823 FILE *fout, *din; 1824 struct stat st; 1825 int (*closefunc)(FILE *); 1826 struct timeval start, finish, td, *tdp; 1827 const char *desc, *error; 1828 1829 din = NULL; 1830 desc = (*fmode == 'w') ? "put" : "append"; 1831 error = NULL; 1832 if (unique && stat(name, &st) == 0 && 1833 (name = gunique(name)) == NULL) { 1834 logxfer(desc, -1, name, NULL, NULL, 1835 "cannot create unique file"); 1836 goto cleanupstore; 1837 } 1838 1839 if (restart_point) 1840 fmode = "r+"; 1841 fout = fopen(name, fmode); 1842 closefunc = fclose; 1843 tdp = NULL; 1844 if (fout == NULL) { 1845 perror_reply(553, name); 1846 logxfer(desc, -1, name, NULL, NULL, strerror(errno)); 1847 goto cleanupstore; 1848 } 1849 byte_count = -1; 1850 if (restart_point) { 1851 if (type == TYPE_A) { 1852 off_t i; 1853 int c; 1854 1855 for (i = 0; i < restart_point; i++) { 1856 if ((c=getc(fout)) == EOF) { 1857 error = strerror(errno); 1858 perror_reply(550, name); 1859 goto done; 1860 } 1861 if (c == '\n') 1862 i++; 1863 } 1864 /* 1865 * We must do this seek to "current" position 1866 * because we are changing from reading to 1867 * writing. 1868 */ 1869 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1870 error = strerror(errno); 1871 perror_reply(550, name); 1872 goto done; 1873 } 1874 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1875 error = strerror(errno); 1876 perror_reply(550, name); 1877 goto done; 1878 } 1879 } 1880 din = dataconn(name, (off_t)-1, "r"); 1881 if (din == NULL) 1882 goto done; 1883 (void)gettimeofday(&start, NULL); 1884 if (receive_data(din, fout) == 0) { 1885 if (unique) 1886 reply(226, "Transfer complete (unique file name:%s).", 1887 name); 1888 else 1889 reply(226, "Transfer complete."); 1890 } 1891 (void)gettimeofday(&finish, NULL); 1892 closedataconn(din); /* close now to affect timing stats */ 1893 timersub(&finish, &start, &td); 1894 tdp = &td; 1895 done: 1896 logxfer(desc, byte_count, name, NULL, tdp, error); 1897 (*closefunc)(fout); 1898 cleanupstore: 1899 ; 1900 } 1901 1902 static FILE * 1903 getdatasock(const char *fmode) 1904 { 1905 int on, s, t, tries; 1906 in_port_t port; 1907 1908 on = 1; 1909 if (data >= 0) 1910 return (fdopen(data, fmode)); 1911 if (! dropprivs) 1912 (void) seteuid((uid_t)0); 1913 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1914 if (s < 0) 1915 goto bad; 1916 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1917 (char *) &on, sizeof(on)) < 0) 1918 goto bad; 1919 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1920 (char *) &on, sizeof(on)) < 0) 1921 goto bad; 1922 /* anchor socket to avoid multi-homing problems */ 1923 data_source = ctrl_addr; 1924 /* 1925 * By default source port for PORT connctions is 1926 * ctrlport-1 (see RFC959 section 5.2). 1927 * However, if privs have been dropped and that 1928 * would be < IPPORT_RESERVED, use a random port 1929 * instead. 1930 */ 1931 if (dataport) 1932 port = dataport; 1933 else 1934 port = ntohs(ctrl_addr.su_port) - 1; 1935 if (dropprivs && port < IPPORT_RESERVED) 1936 port = 0; /* use random port */ 1937 data_source.su_port = htons(port); 1938 1939 for (tries = 1; ; tries++) { 1940 if (bind(s, (struct sockaddr *)&data_source.si_su, 1941 data_source.su_len) >= 0) 1942 break; 1943 if (errno != EADDRINUSE || tries > 10) 1944 goto bad; 1945 sleep(tries); 1946 } 1947 if (! dropprivs) 1948 (void) seteuid((uid_t)pw->pw_uid); 1949 #ifdef IP_TOS 1950 if (!mapped && ctrl_addr.su_family == AF_INET) { 1951 on = IPTOS_THROUGHPUT; 1952 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1953 sizeof(int)) < 0) 1954 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1955 } 1956 #endif 1957 return (fdopen(s, fmode)); 1958 bad: 1959 /* Return the real value of errno (close may change it) */ 1960 t = errno; 1961 if (! dropprivs) 1962 (void) seteuid((uid_t)pw->pw_uid); 1963 (void) close(s); 1964 errno = t; 1965 return (NULL); 1966 } 1967 1968 FILE * 1969 dataconn(const char *name, off_t size, const char *fmode) 1970 { 1971 char sizebuf[32]; 1972 FILE *file; 1973 int retry, tos, keepalive, conerrno; 1974 1975 file_size = size; 1976 byte_count = 0; 1977 if (size != (off_t) -1) 1978 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1979 (LLT)size, PLURAL(size)); 1980 else 1981 sizebuf[0] = '\0'; 1982 if (pdata >= 0) { 1983 struct sockinet from; 1984 int s; 1985 socklen_t fromlen = sizeof(from.su_len); 1986 1987 (void) alarm(curclass.timeout); 1988 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 1989 (void) alarm(0); 1990 if (s < 0) { 1991 reply(425, "Can't open data connection."); 1992 (void) close(pdata); 1993 pdata = -1; 1994 return (NULL); 1995 } 1996 (void) close(pdata); 1997 pdata = s; 1998 switch (from.su_family) { 1999 case AF_INET: 2000 #ifdef IP_TOS 2001 if (!mapped) { 2002 tos = IPTOS_THROUGHPUT; 2003 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 2004 (char *)&tos, sizeof(int)); 2005 } 2006 break; 2007 #endif 2008 } 2009 /* Set keepalives on the socket to detect dropped conns. */ 2010 #ifdef SO_KEEPALIVE 2011 keepalive = 1; 2012 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 2013 (char *)&keepalive, sizeof(int)); 2014 #endif 2015 reply(150, "Opening %s mode data connection for '%s'%s.", 2016 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2017 return (fdopen(pdata, fmode)); 2018 } 2019 if (data >= 0) { 2020 reply(125, "Using existing data connection for '%s'%s.", 2021 name, sizebuf); 2022 usedefault = 1; 2023 return (fdopen(data, fmode)); 2024 } 2025 if (usedefault) 2026 data_dest = his_addr; 2027 usedefault = 1; 2028 retry = conerrno = 0; 2029 do { 2030 file = getdatasock(fmode); 2031 if (file == NULL) { 2032 char hbuf[NI_MAXHOST]; 2033 char pbuf[NI_MAXSERV]; 2034 2035 if (getnameinfo((struct sockaddr *)&data_source.si_su, 2036 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 2037 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV)) 2038 strlcpy(hbuf, "?", sizeof(hbuf)); 2039 reply(425, "Can't create data socket (%s,%s): %s.", 2040 hbuf, pbuf, strerror(errno)); 2041 return (NULL); 2042 } 2043 data = fileno(file); 2044 conerrno = 0; 2045 if (connect(data, (struct sockaddr *)&data_dest.si_su, 2046 data_dest.su_len) == 0) 2047 break; 2048 conerrno = errno; 2049 (void) fclose(file); 2050 file = NULL; 2051 data = -1; 2052 if (conerrno == EADDRINUSE) { 2053 sleep((unsigned) swaitint); 2054 retry += swaitint; 2055 } else { 2056 break; 2057 } 2058 } while (retry <= swaitmax); 2059 if (conerrno != 0) { 2060 perror_reply(425, "Can't build data connection"); 2061 return (NULL); 2062 } 2063 reply(150, "Opening %s mode data connection for '%s'%s.", 2064 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2065 return (file); 2066 } 2067 2068 void 2069 closedataconn(FILE *fd) 2070 { 2071 2072 if (fd == NULL) 2073 return; 2074 (void)fclose(fd); 2075 data = -1; 2076 if (pdata >= 0) 2077 (void)close(pdata); 2078 pdata = -1; 2079 } 2080 2081 int 2082 write_data(int fd, char *buf, size_t size, off_t *bufrem, 2083 struct timeval *then, int isdata) 2084 { 2085 struct timeval now, td; 2086 ssize_t c; 2087 2088 while (size > 0) { 2089 c = size; 2090 if (curclass.writesize) { 2091 if (curclass.writesize < c) 2092 c = curclass.writesize; 2093 } 2094 if (curclass.rateget) { 2095 if (*bufrem < c) 2096 c = *bufrem; 2097 } 2098 (void) alarm(curclass.timeout); 2099 c = write(fd, buf, c); 2100 if (c <= 0) 2101 return (1); 2102 buf += c; 2103 size -= c; 2104 byte_count += c; 2105 if (isdata) { 2106 total_data_out += c; 2107 total_data += c; 2108 } 2109 total_bytes_out += c; 2110 total_bytes += c; 2111 if (curclass.rateget) { 2112 *bufrem -= c; 2113 if (*bufrem == 0) { 2114 (void)gettimeofday(&now, NULL); 2115 timersub(&now, then, &td); 2116 if (td.tv_sec == 0) { 2117 usleep(1000000 - td.tv_usec); 2118 (void)gettimeofday(then, NULL); 2119 } else 2120 *then = now; 2121 *bufrem = curclass.rateget; 2122 } 2123 } 2124 } 2125 return (0); 2126 } 2127 2128 static enum send_status 2129 send_data_with_read(int filefd, int netfd, const struct stat *st, int isdata) 2130 { 2131 struct timeval then; 2132 off_t bufrem; 2133 ssize_t readsize; 2134 char *buf; 2135 int c, error; 2136 2137 if (curclass.readsize > 0) 2138 readsize = curclass.readsize; 2139 else 2140 readsize = st->st_blksize; 2141 if ((buf = malloc(readsize)) == NULL) { 2142 perror_reply(451, "Local resource failure: malloc"); 2143 return (SS_NO_TRANSFER); 2144 } 2145 2146 if (curclass.rateget) { 2147 bufrem = curclass.rateget; 2148 (void)gettimeofday(&then, NULL); 2149 } else 2150 bufrem = readsize; 2151 while (1) { 2152 (void) alarm(curclass.timeout); 2153 c = read(filefd, buf, readsize); 2154 if (c == 0) 2155 error = SS_SUCCESS; 2156 else if (c < 0) 2157 error = SS_FILE_ERROR; 2158 else if (write_data(netfd, buf, c, &bufrem, &then, isdata)) 2159 error = SS_DATA_ERROR; 2160 else if (urgflag && handleoobcmd()) 2161 error = SS_ABORTED; 2162 else 2163 continue; 2164 2165 free(buf); 2166 return (error); 2167 } 2168 } 2169 2170 static enum send_status 2171 send_data_with_mmap(int filefd, int netfd, const struct stat *st, int isdata) 2172 { 2173 struct timeval then; 2174 off_t bufrem, filesize, off, origoff; 2175 ssize_t mapsize, winsize; 2176 int error, sendbufsize, sendlowat; 2177 void *win; 2178 2179 bufrem = 0; 2180 if (curclass.sendbufsize) { 2181 sendbufsize = curclass.sendbufsize; 2182 if (setsockopt(netfd, SOL_SOCKET, SO_SNDBUF, 2183 &sendbufsize, sizeof(int)) == -1) 2184 syslog(LOG_WARNING, "setsockopt(SO_SNDBUF, %d): %m", 2185 sendbufsize); 2186 } 2187 2188 if (curclass.sendlowat) { 2189 sendlowat = curclass.sendlowat; 2190 if (setsockopt(netfd, SOL_SOCKET, SO_SNDLOWAT, 2191 &sendlowat, sizeof(int)) == -1) 2192 syslog(LOG_WARNING, "setsockopt(SO_SNDLOWAT, %d): %m", 2193 sendlowat); 2194 } 2195 2196 winsize = curclass.mmapsize; 2197 filesize = st->st_size; 2198 if (ftpd_debug) 2199 syslog(LOG_INFO, "mmapsize = " LLF ", writesize = " LLF, 2200 (LLT)winsize, (LLT)curclass.writesize); 2201 if (winsize <= 0) 2202 goto try_read; 2203 2204 off = lseek(filefd, (off_t)0, SEEK_CUR); 2205 if (off == -1) 2206 goto try_read; 2207 2208 origoff = off; 2209 if (curclass.rateget) { 2210 bufrem = curclass.rateget; 2211 (void)gettimeofday(&then, NULL); 2212 } else 2213 bufrem = winsize; 2214 while (1) { 2215 mapsize = MIN(filesize - off, winsize); 2216 if (mapsize == 0) 2217 break; 2218 win = mmap(NULL, mapsize, PROT_READ, 2219 MAP_FILE|MAP_SHARED, filefd, off); 2220 if (win == MAP_FAILED) { 2221 if (off == origoff) 2222 goto try_read; 2223 return (SS_FILE_ERROR); 2224 } 2225 (void) madvise(win, mapsize, MADV_SEQUENTIAL); 2226 error = write_data(netfd, win, mapsize, &bufrem, &then, 2227 isdata); 2228 (void) madvise(win, mapsize, MADV_DONTNEED); 2229 munmap(win, mapsize); 2230 if (urgflag && handleoobcmd()) 2231 return (SS_ABORTED); 2232 if (error) 2233 return (SS_DATA_ERROR); 2234 off += mapsize; 2235 } 2236 return (SS_SUCCESS); 2237 2238 try_read: 2239 return (send_data_with_read(filefd, netfd, st, isdata)); 2240 } 2241 2242 /* 2243 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2244 * encapsulation of the data subject to Mode, Structure, and Type. 2245 * 2246 * NB: Form isn't handled. 2247 */ 2248 static int 2249 send_data(FILE *instr, FILE *outstr, const struct stat *st, int isdata) 2250 { 2251 int c, filefd, netfd, rval; 2252 2253 urgflag = 0; 2254 transflag = 1; 2255 rval = -1; 2256 2257 switch (type) { 2258 2259 case TYPE_A: 2260 /* XXXLUKEM: rate limit ascii send (get) */ 2261 (void) alarm(curclass.timeout); 2262 while ((c = getc(instr)) != EOF) { 2263 if (urgflag && handleoobcmd()) 2264 goto cleanup_send_data; 2265 byte_count++; 2266 if (c == '\n') { 2267 if (ferror(outstr)) 2268 goto data_err; 2269 (void) putc('\r', outstr); 2270 if (isdata) { 2271 total_data_out++; 2272 total_data++; 2273 } 2274 total_bytes_out++; 2275 total_bytes++; 2276 } 2277 (void) putc(c, outstr); 2278 if (isdata) { 2279 total_data_out++; 2280 total_data++; 2281 } 2282 total_bytes_out++; 2283 total_bytes++; 2284 if ((byte_count % 4096) == 0) 2285 (void) alarm(curclass.timeout); 2286 } 2287 (void) alarm(0); 2288 fflush(outstr); 2289 if (ferror(instr)) 2290 goto file_err; 2291 if (ferror(outstr)) 2292 goto data_err; 2293 rval = 0; 2294 goto cleanup_send_data; 2295 2296 case TYPE_I: 2297 case TYPE_L: 2298 filefd = fileno(instr); 2299 netfd = fileno(outstr); 2300 switch (send_data_with_mmap(filefd, netfd, st, isdata)) { 2301 2302 case SS_SUCCESS: 2303 break; 2304 2305 case SS_ABORTED: 2306 case SS_NO_TRANSFER: 2307 goto cleanup_send_data; 2308 2309 case SS_FILE_ERROR: 2310 goto file_err; 2311 2312 case SS_DATA_ERROR: 2313 goto data_err; 2314 } 2315 rval = 0; 2316 goto cleanup_send_data; 2317 2318 default: 2319 reply(550, "Unimplemented TYPE %d in send_data", type); 2320 goto cleanup_send_data; 2321 } 2322 2323 data_err: 2324 (void) alarm(0); 2325 perror_reply(426, "Data connection"); 2326 goto cleanup_send_data; 2327 2328 file_err: 2329 (void) alarm(0); 2330 perror_reply(551, "Error on input file"); 2331 goto cleanup_send_data; 2332 2333 cleanup_send_data: 2334 (void) alarm(0); 2335 transflag = 0; 2336 urgflag = 0; 2337 if (isdata) { 2338 total_files_out++; 2339 total_files++; 2340 } 2341 total_xfers_out++; 2342 total_xfers++; 2343 return (rval); 2344 } 2345 2346 /* 2347 * Transfer data from peer to "outstr" using the appropriate encapulation of 2348 * the data subject to Mode, Structure, and Type. 2349 * 2350 * N.B.: Form isn't handled. 2351 */ 2352 static int 2353 receive_data(FILE *instr, FILE *outstr) 2354 { 2355 int c, netfd, filefd, rval; 2356 int volatile bare_lfs; 2357 off_t byteswritten; 2358 char *buf; 2359 ssize_t readsize; 2360 struct sigaction sa, sa_saved; 2361 struct stat st; 2362 2363 memset(&sa, 0, sizeof(sa)); 2364 sigfillset(&sa.sa_mask); 2365 sa.sa_flags = SA_RESTART; 2366 sa.sa_handler = lostconn; 2367 (void) sigaction(SIGALRM, &sa, &sa_saved); 2368 2369 bare_lfs = 0; 2370 urgflag = 0; 2371 transflag = 1; 2372 rval = -1; 2373 byteswritten = 0; 2374 buf = NULL; 2375 2376 #define FILESIZECHECK(x) \ 2377 do { \ 2378 if (curclass.maxfilesize != -1 && \ 2379 (x) > curclass.maxfilesize) { \ 2380 errno = EFBIG; \ 2381 goto file_err; \ 2382 } \ 2383 } while (0) 2384 2385 switch (type) { 2386 2387 case TYPE_I: 2388 case TYPE_L: 2389 netfd = fileno(instr); 2390 filefd = fileno(outstr); 2391 (void) alarm(curclass.timeout); 2392 if (curclass.readsize) 2393 readsize = curclass.readsize; 2394 else if (fstat(filefd, &st)) 2395 readsize = (ssize_t)st.st_blksize; 2396 else 2397 readsize = BUFSIZ; 2398 if ((buf = malloc(readsize)) == NULL) { 2399 perror_reply(451, "Local resource failure: malloc"); 2400 goto cleanup_recv_data; 2401 } 2402 if (curclass.rateput) { 2403 while (1) { 2404 int d; 2405 struct timeval then, now, td; 2406 off_t bufrem; 2407 2408 (void)gettimeofday(&then, NULL); 2409 errno = c = d = 0; 2410 for (bufrem = curclass.rateput; bufrem > 0; ) { 2411 if ((c = read(netfd, buf, 2412 MIN(readsize, bufrem))) <= 0) 2413 goto recvdone; 2414 if (urgflag && handleoobcmd()) 2415 goto cleanup_recv_data; 2416 FILESIZECHECK(byte_count + c); 2417 if ((d = write(filefd, buf, c)) != c) 2418 goto file_err; 2419 (void) alarm(curclass.timeout); 2420 bufrem -= c; 2421 byte_count += c; 2422 total_data_in += c; 2423 total_data += c; 2424 total_bytes_in += c; 2425 total_bytes += c; 2426 } 2427 (void)gettimeofday(&now, NULL); 2428 timersub(&now, &then, &td); 2429 if (td.tv_sec == 0) 2430 usleep(1000000 - td.tv_usec); 2431 } 2432 } else { 2433 while ((c = read(netfd, buf, readsize)) > 0) { 2434 if (urgflag && handleoobcmd()) 2435 goto cleanup_recv_data; 2436 FILESIZECHECK(byte_count + c); 2437 if (write(filefd, buf, c) != c) 2438 goto file_err; 2439 (void) alarm(curclass.timeout); 2440 byte_count += c; 2441 total_data_in += c; 2442 total_data += c; 2443 total_bytes_in += c; 2444 total_bytes += c; 2445 } 2446 } 2447 recvdone: 2448 if (c < 0) 2449 goto data_err; 2450 rval = 0; 2451 goto cleanup_recv_data; 2452 2453 case TYPE_E: 2454 reply(553, "TYPE E not implemented."); 2455 goto cleanup_recv_data; 2456 2457 case TYPE_A: 2458 (void) alarm(curclass.timeout); 2459 /* XXXLUKEM: rate limit ascii receive (put) */ 2460 while ((c = getc(instr)) != EOF) { 2461 if (urgflag && handleoobcmd()) 2462 goto cleanup_recv_data; 2463 byte_count++; 2464 total_data_in++; 2465 total_data++; 2466 total_bytes_in++; 2467 total_bytes++; 2468 if ((byte_count % 4096) == 0) 2469 (void) alarm(curclass.timeout); 2470 if (c == '\n') 2471 bare_lfs++; 2472 while (c == '\r') { 2473 if (ferror(outstr)) 2474 goto data_err; 2475 if ((c = getc(instr)) != '\n') { 2476 byte_count++; 2477 total_data_in++; 2478 total_data++; 2479 total_bytes_in++; 2480 total_bytes++; 2481 if ((byte_count % 4096) == 0) 2482 (void) alarm(curclass.timeout); 2483 byteswritten++; 2484 FILESIZECHECK(byteswritten); 2485 (void) putc ('\r', outstr); 2486 if (c == '\0' || c == EOF) 2487 goto contin2; 2488 } 2489 } 2490 byteswritten++; 2491 FILESIZECHECK(byteswritten); 2492 (void) putc(c, outstr); 2493 contin2: ; 2494 } 2495 (void) alarm(0); 2496 fflush(outstr); 2497 if (ferror(instr)) 2498 goto data_err; 2499 if (ferror(outstr)) 2500 goto file_err; 2501 if (bare_lfs) { 2502 reply(-226, 2503 "WARNING! %d bare linefeeds received in ASCII mode", 2504 bare_lfs); 2505 reply(0, "File may not have transferred correctly."); 2506 } 2507 rval = 0; 2508 goto cleanup_recv_data; 2509 2510 default: 2511 reply(550, "Unimplemented TYPE %d in receive_data", type); 2512 goto cleanup_recv_data; 2513 } 2514 #undef FILESIZECHECK 2515 2516 data_err: 2517 (void) alarm(0); 2518 perror_reply(426, "Data Connection"); 2519 goto cleanup_recv_data; 2520 2521 file_err: 2522 (void) alarm(0); 2523 perror_reply(452, "Error writing file"); 2524 goto cleanup_recv_data; 2525 2526 cleanup_recv_data: 2527 (void) alarm(0); 2528 (void) sigaction(SIGALRM, &sa_saved, NULL); 2529 if (buf) 2530 free(buf); 2531 transflag = 0; 2532 urgflag = 0; 2533 total_files_in++; 2534 total_files++; 2535 total_xfers_in++; 2536 total_xfers++; 2537 return (rval); 2538 } 2539 2540 void 2541 statcmd(void) 2542 { 2543 struct sockinet *su = NULL; 2544 static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 2545 unsigned char *a, *p; 2546 int ispassive, af; 2547 off_t otbi, otbo, otb; 2548 2549 a = p = (unsigned char *)NULL; 2550 2551 reply(-211, "%s FTP server status:", hostname); 2552 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 2553 hbuf[0] = '\0'; 2554 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 2555 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) 2556 && strcmp(remotehost, hbuf) != 0) 2557 reply(0, "Connected to %s (%s)", remotehost, hbuf); 2558 else 2559 reply(0, "Connected to %s", remotehost); 2560 2561 if (logged_in) { 2562 if (curclass.type == CLASS_GUEST) 2563 reply(0, "Logged in anonymously"); 2564 else 2565 reply(0, "Logged in as %s%s", pw->pw_name, 2566 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 2567 } else if (askpasswd) 2568 reply(0, "Waiting for password"); 2569 else 2570 reply(0, "Waiting for user name"); 2571 cprintf(stdout, " TYPE: %s", typenames[type]); 2572 if (type == TYPE_A || type == TYPE_E) 2573 cprintf(stdout, ", FORM: %s", formnames[form]); 2574 if (type == TYPE_L) { 2575 #if NBBY == 8 2576 cprintf(stdout, " %d", NBBY); 2577 #else 2578 /* XXX: `bytesize' needs to be defined in this case */ 2579 cprintf(stdout, " %d", bytesize); 2580 #endif 2581 } 2582 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 2583 strunames[stru], modenames[mode]); 2584 ispassive = 0; 2585 if (data != -1) { 2586 reply(0, "Data connection open"); 2587 su = NULL; 2588 } else if (pdata != -1) { 2589 reply(0, "in Passive mode"); 2590 if (curclass.advertise.su_len != 0) 2591 su = &curclass.advertise; 2592 else 2593 su = &pasv_addr; 2594 ispassive = 1; 2595 goto printaddr; 2596 } else if (usedefault == 0) { 2597 su = (struct sockinet *)&data_dest; 2598 2599 if (epsvall) { 2600 reply(0, "EPSV only mode (EPSV ALL)"); 2601 goto epsvonly; 2602 } 2603 printaddr: 2604 /* PASV/PORT */ 2605 if (su->su_family == AF_INET) { 2606 a = (unsigned char *) &su->su_addr; 2607 p = (unsigned char *) &su->su_port; 2608 #define UC(b) (((int) b) & 0xff) 2609 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 2610 ispassive ? "PASV" : "PORT" , 2611 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2612 UC(p[0]), UC(p[1])); 2613 } 2614 2615 /* LPSV/LPRT */ 2616 { 2617 int alen, i; 2618 2619 alen = 0; 2620 switch (su->su_family) { 2621 case AF_INET: 2622 a = (unsigned char *) &su->su_addr; 2623 p = (unsigned char *) &su->su_port; 2624 alen = sizeof(su->su_addr); 2625 af = 4; 2626 break; 2627 #ifdef INET6 2628 case AF_INET6: 2629 a = (unsigned char *) &su->su_6addr; 2630 p = (unsigned char *) &su->su_port; 2631 alen = sizeof(su->su_6addr); 2632 af = 6; 2633 break; 2634 #endif 2635 default: 2636 af = 0; 2637 break; 2638 } 2639 if (af) { 2640 cprintf(stdout, " %s (%d,%d", 2641 ispassive ? "LPSV" : "LPRT", af, alen); 2642 for (i = 0; i < alen; i++) 2643 cprintf(stdout, ",%d", UC(a[i])); 2644 cprintf(stdout, ",%d,%d,%d)\r\n", 2645 2, UC(p[0]), UC(p[1])); 2646 #undef UC 2647 } 2648 } 2649 2650 /* EPRT/EPSV */ 2651 epsvonly: 2652 af = af2epsvproto(su->su_family); 2653 hbuf[0] = '\0'; 2654 if (af > 0) { 2655 struct sockinet tmp; 2656 2657 tmp = *su; 2658 #ifdef INET6 2659 if (tmp.su_family == AF_INET6) 2660 tmp.su_scope_id = 0; 2661 #endif 2662 if (getnameinfo((struct sockaddr *)&tmp.si_su, 2663 tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 2664 NI_NUMERICHOST | NI_NUMERICSERV) == 0) 2665 reply(0, "%s (|%d|%s|%s|)", 2666 ispassive ? "EPSV" : "EPRT", 2667 af, hbuf, sbuf); 2668 } 2669 } else 2670 reply(0, "No data connection"); 2671 2672 if (logged_in) { 2673 reply(0, 2674 "Data sent: " LLF " byte%s in " LLF " file%s", 2675 (LLT)total_data_out, PLURAL(total_data_out), 2676 (LLT)total_files_out, PLURAL(total_files_out)); 2677 reply(0, 2678 "Data received: " LLF " byte%s in " LLF " file%s", 2679 (LLT)total_data_in, PLURAL(total_data_in), 2680 (LLT)total_files_in, PLURAL(total_files_in)); 2681 reply(0, 2682 "Total data: " LLF " byte%s in " LLF " file%s", 2683 (LLT)total_data, PLURAL(total_data), 2684 (LLT)total_files, PLURAL(total_files)); 2685 } 2686 otbi = total_bytes_in; 2687 otbo = total_bytes_out; 2688 otb = total_bytes; 2689 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 2690 (LLT)otbo, PLURAL(otbo), 2691 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 2692 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 2693 (LLT)otbi, PLURAL(otbi), 2694 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 2695 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 2696 (LLT)otb, PLURAL(otb), 2697 (LLT)total_xfers, PLURAL(total_xfers)); 2698 2699 if (logged_in && !CURCLASS_FLAGS_ISSET(private)) { 2700 struct ftpconv *cp; 2701 2702 reply(0, "%s", ""); 2703 reply(0, "Class: %s, type: %s", 2704 curclass.classname, CURCLASSTYPE); 2705 reply(0, "Check PORT/LPRT commands: %sabled", 2706 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 2707 if (! EMPTYSTR(curclass.display)) 2708 reply(0, "Display file: %s", curclass.display); 2709 if (! EMPTYSTR(curclass.notify)) 2710 reply(0, "Notify fileglob: %s", curclass.notify); 2711 reply(0, "Idle timeout: " LLF ", maximum timeout: " LLF, 2712 (LLT)curclass.timeout, (LLT)curclass.maxtimeout); 2713 reply(0, "Current connections: %d", connections); 2714 if (curclass.limit == -1) 2715 reply(0, "Maximum connections: unlimited"); 2716 else 2717 reply(0, "Maximum connections: " LLF, 2718 (LLT)curclass.limit); 2719 if (curclass.limitfile) 2720 reply(0, "Connection limit exceeded message file: %s", 2721 conffilename(curclass.limitfile)); 2722 if (! EMPTYSTR(curclass.chroot)) 2723 reply(0, "Chroot format: %s", curclass.chroot); 2724 reply(0, "Deny bad ftpusers(5) quickly: %sabled", 2725 CURCLASS_FLAGS_ISSET(denyquick) ? "en" : "dis"); 2726 if (! EMPTYSTR(curclass.homedir)) 2727 reply(0, "Homedir format: %s", curclass.homedir); 2728 if (curclass.maxfilesize == -1) 2729 reply(0, "Maximum file size: unlimited"); 2730 else 2731 reply(0, "Maximum file size: " LLF, 2732 (LLT)curclass.maxfilesize); 2733 if (! EMPTYSTR(curclass.motd)) 2734 reply(0, "MotD file: %s", conffilename(curclass.motd)); 2735 reply(0, 2736 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2737 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2738 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2739 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2740 reply(0, "Sanitize file names: %sabled", 2741 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2742 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2743 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2744 if (curclass.advertise.su_len != 0) { 2745 char buf[50]; /* big enough for IPv6 address */ 2746 const char *bp; 2747 2748 bp = inet_ntop(curclass.advertise.su_family, 2749 (void *)&curclass.advertise.su_addr, 2750 buf, sizeof(buf)); 2751 if (bp != NULL) 2752 reply(0, "PASV advertise address: %s", bp); 2753 } 2754 if (curclass.portmin && curclass.portmax) 2755 reply(0, "PASV port range: " LLF " - " LLF, 2756 (LLT)curclass.portmin, (LLT)curclass.portmax); 2757 if (curclass.rateget) 2758 reply(0, "Rate get limit: " LLF " bytes/sec", 2759 (LLT)curclass.rateget); 2760 else 2761 reply(0, "Rate get limit: disabled"); 2762 if (curclass.rateput) 2763 reply(0, "Rate put limit: " LLF " bytes/sec", 2764 (LLT)curclass.rateput); 2765 else 2766 reply(0, "Rate put limit: disabled"); 2767 if (curclass.mmapsize) 2768 reply(0, "Mmap size: " LLF, (LLT)curclass.mmapsize); 2769 else 2770 reply(0, "Mmap size: disabled"); 2771 if (curclass.readsize) 2772 reply(0, "Read size: " LLF, (LLT)curclass.readsize); 2773 else 2774 reply(0, "Read size: default"); 2775 if (curclass.writesize) 2776 reply(0, "Write size: " LLF, (LLT)curclass.writesize); 2777 else 2778 reply(0, "Write size: default"); 2779 if (curclass.recvbufsize) 2780 reply(0, "Receive buffer size: " LLF, 2781 (LLT)curclass.recvbufsize); 2782 else 2783 reply(0, "Receive buffer size: default"); 2784 if (curclass.sendbufsize) 2785 reply(0, "Send buffer size: " LLF, 2786 (LLT)curclass.sendbufsize); 2787 else 2788 reply(0, "Send buffer size: default"); 2789 if (curclass.sendlowat) 2790 reply(0, "Send low water mark: " LLF, 2791 (LLT)curclass.sendlowat); 2792 else 2793 reply(0, "Send low water mark: default"); 2794 reply(0, "Umask: %.04o", curclass.umask); 2795 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2796 if (cp->suffix == NULL || cp->types == NULL || 2797 cp->command == NULL) 2798 continue; 2799 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2800 cp->suffix, cp->types, cp->disable, cp->command); 2801 } 2802 } 2803 2804 reply(211, "End of status"); 2805 } 2806 2807 void 2808 fatal(const char *s) 2809 { 2810 2811 reply(451, "Error in server: %s\n", s); 2812 reply(221, "Closing connection due to server error."); 2813 dologout(0); 2814 /* NOTREACHED */ 2815 } 2816 2817 /* 2818 * reply() -- 2819 * depending on the value of n, display fmt with a trailing CRLF and 2820 * prefix of: 2821 * n < -1 prefix the message with abs(n) + "-" (initial line) 2822 * n == 0 prefix the message with 4 spaces (middle lines) 2823 * n > 0 prefix the message with n + " " (final line) 2824 */ 2825 void 2826 reply(int n, const char *fmt, ...) 2827 { 2828 char msg[MAXPATHLEN * 2 + 100]; 2829 size_t b; 2830 va_list ap; 2831 2832 b = 0; 2833 if (n == 0) 2834 b = snprintf(msg, sizeof(msg), " "); 2835 else if (n < 0) 2836 b = snprintf(msg, sizeof(msg), "%d-", -n); 2837 else 2838 b = snprintf(msg, sizeof(msg), "%d ", n); 2839 va_start(ap, fmt); 2840 vsnprintf(msg + b, sizeof(msg) - b, fmt, ap); 2841 va_end(ap); 2842 cprintf(stdout, "%s\r\n", msg); 2843 (void)fflush(stdout); 2844 if (ftpd_debug) 2845 syslog(LOG_DEBUG, "<--- %s", msg); 2846 } 2847 2848 static void 2849 logremotehost(struct sockinet *who) 2850 { 2851 2852 #if defined(HAVE_SOCKADDR_SNPRINTF) 2853 char abuf[BUFSIZ]; 2854 #endif 2855 2856 struct sockaddr *sa = (struct sockaddr *)&who->si_su; 2857 if (getnameinfo(sa, who->su_len, remotehost, sizeof(remotehost), NULL, 2858 0, getnameopts)) 2859 strlcpy(remotehost, "?", sizeof(remotehost)); 2860 #if defined(HAVE_SOCKADDR_SNPRINTF) 2861 sockaddr_snprintf(abuf, sizeof(abuf), "%a", sa); 2862 snprintf(remoteloghost, sizeof(remoteloghost), "%s(%s)", remotehost, 2863 abuf); 2864 #else 2865 strlcpy(remoteloghost, remotehost, sizeof(remoteloghost)); 2866 #endif 2867 2868 #if defined(HAVE_SETPROCTITLE) 2869 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2870 setproctitle("%s", proctitle); 2871 #endif /* defined(HAVE_SETPROCTITLE) */ 2872 if (logging) 2873 syslog(LOG_INFO, "connection from %s to %s", 2874 remoteloghost, hostname); 2875 } 2876 2877 /* 2878 * Record logout in wtmp file and exit with supplied status. 2879 * NOTE: because this is called from signal handlers it cannot 2880 * use stdio (or call other functions that use stdio). 2881 */ 2882 void 2883 dologout(int status) 2884 { 2885 /* 2886 * Prevent reception of SIGURG from resulting in a resumption 2887 * back to the main program loop. 2888 */ 2889 transflag = 0; 2890 logout_utmp(); 2891 if (logged_in) { 2892 #ifdef KERBEROS 2893 if (!notickets && krbtkfile_env) 2894 unlink(krbtkfile_env); 2895 #endif 2896 } 2897 /* beware of flushing buffers after a SIGPIPE */ 2898 if (xferlogfd != -1) 2899 close(xferlogfd); 2900 _exit(status); 2901 } 2902 2903 void 2904 abor(void) 2905 { 2906 2907 if (!transflag) 2908 return; 2909 tmpline[0] = '\0'; 2910 is_oob = 0; 2911 reply(426, "Transfer aborted. Data connection closed."); 2912 reply(226, "Abort successful"); 2913 transflag = 0; /* flag that the transfer has aborted */ 2914 } 2915 2916 void 2917 statxfer(void) 2918 { 2919 2920 if (!transflag) 2921 return; 2922 tmpline[0] = '\0'; 2923 is_oob = 0; 2924 if (file_size != (off_t) -1) 2925 reply(213, 2926 "Status: " LLF " of " LLF " byte%s transferred", 2927 (LLT)byte_count, (LLT)file_size, 2928 PLURAL(byte_count)); 2929 else 2930 reply(213, "Status: " LLF " byte%s transferred", 2931 (LLT)byte_count, PLURAL(byte_count)); 2932 } 2933 2934 /* 2935 * Call when urgflag != 0 to handle Out Of Band commands. 2936 * Returns non zero if the OOB command aborted the transfer 2937 * by setting transflag to 0. (c.f., "ABOR"). 2938 */ 2939 static int 2940 handleoobcmd() 2941 { 2942 char *cp; 2943 int ret; 2944 2945 if (!urgflag) 2946 return (0); 2947 urgflag = 0; 2948 /* only process if transfer occurring */ 2949 if (!transflag) 2950 return (0); 2951 cp = tmpline; 2952 ret = get_line(cp, sizeof(tmpline)-1, stdin); 2953 if (ret == -1) { 2954 reply(221, "You could at least say goodbye."); 2955 dologout(0); 2956 } else if (ret == -2) { 2957 /* Ignore truncated command */ 2958 /* XXX: abort xfer with "500 command too long", & return 1 ? */ 2959 return 0; 2960 } 2961 /* 2962 * Manually parse OOB commands, because we can't 2963 * recursively call the yacc parser... 2964 */ 2965 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2966 abor(); 2967 } else if (strcasecmp(cp, "STAT\r\n") == 0) { 2968 statxfer(); 2969 } else { 2970 /* XXX: error with "500 unknown command" ? */ 2971 } 2972 return (transflag == 0); 2973 } 2974 2975 static int 2976 bind_pasv_addr(void) 2977 { 2978 static int passiveport; 2979 int port, len; 2980 2981 len = pasv_addr.su_len; 2982 if (curclass.portmin == 0 && curclass.portmax == 0) { 2983 pasv_addr.su_port = 0; 2984 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2985 } 2986 2987 if (passiveport == 0) { 2988 srand(getpid()); 2989 passiveport = rand() % (curclass.portmax - curclass.portmin) 2990 + curclass.portmin; 2991 } 2992 2993 port = passiveport; 2994 while (1) { 2995 port++; 2996 if (port > curclass.portmax) 2997 port = curclass.portmin; 2998 else if (port == passiveport) { 2999 errno = EAGAIN; 3000 return (-1); 3001 } 3002 pasv_addr.su_port = htons(port); 3003 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 3004 break; 3005 if (errno != EADDRINUSE) 3006 return (-1); 3007 } 3008 passiveport = port; 3009 return (0); 3010 } 3011 3012 /* 3013 * Note: a response of 425 is not mentioned as a possible response to 3014 * the PASV command in RFC959. However, it has been blessed as 3015 * a legitimate response by Jon Postel in a telephone conversation 3016 * with Rick Adams on 25 Jan 89. 3017 */ 3018 void 3019 passive(void) 3020 { 3021 socklen_t len; 3022 int recvbufsize; 3023 char *p, *a; 3024 3025 if (pdata >= 0) 3026 close(pdata); 3027 pdata = socket(AF_INET, SOCK_STREAM, 0); 3028 if (pdata < 0 || !logged_in) { 3029 perror_reply(425, "Can't open passive connection"); 3030 return; 3031 } 3032 pasv_addr = ctrl_addr; 3033 3034 if (bind_pasv_addr() < 0) 3035 goto pasv_error; 3036 len = pasv_addr.su_len; 3037 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 3038 goto pasv_error; 3039 pasv_addr.su_len = len; 3040 if (curclass.recvbufsize) { 3041 recvbufsize = curclass.recvbufsize; 3042 if (setsockopt(pdata, SOL_SOCKET, SO_RCVBUF, &recvbufsize, 3043 sizeof(int)) == -1) 3044 syslog(LOG_WARNING, "setsockopt(SO_RCVBUF, %d): %m", 3045 recvbufsize); 3046 } 3047 if (listen(pdata, 1) < 0) 3048 goto pasv_error; 3049 if (curclass.advertise.su_len != 0) 3050 a = (char *) &curclass.advertise.su_addr; 3051 else 3052 a = (char *) &pasv_addr.su_addr; 3053 p = (char *) &pasv_addr.su_port; 3054 3055 #define UC(b) (((int) b) & 0xff) 3056 3057 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 3058 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 3059 return; 3060 3061 pasv_error: 3062 (void) close(pdata); 3063 pdata = -1; 3064 perror_reply(425, "Can't open passive connection"); 3065 return; 3066 } 3067 3068 /* 3069 * convert protocol identifier to/from AF 3070 */ 3071 int 3072 lpsvproto2af(int proto) 3073 { 3074 3075 switch (proto) { 3076 case 4: 3077 return AF_INET; 3078 #ifdef INET6 3079 case 6: 3080 return AF_INET6; 3081 #endif 3082 default: 3083 return -1; 3084 } 3085 } 3086 3087 int 3088 af2lpsvproto(int af) 3089 { 3090 3091 switch (af) { 3092 case AF_INET: 3093 return 4; 3094 #ifdef INET6 3095 case AF_INET6: 3096 return 6; 3097 #endif 3098 default: 3099 return -1; 3100 } 3101 } 3102 3103 int 3104 epsvproto2af(int proto) 3105 { 3106 3107 switch (proto) { 3108 case 1: 3109 return AF_INET; 3110 #ifdef INET6 3111 case 2: 3112 return AF_INET6; 3113 #endif 3114 default: 3115 return -1; 3116 } 3117 } 3118 3119 int 3120 af2epsvproto(int af) 3121 { 3122 3123 switch (af) { 3124 case AF_INET: 3125 return 1; 3126 #ifdef INET6 3127 case AF_INET6: 3128 return 2; 3129 #endif 3130 default: 3131 return -1; 3132 } 3133 } 3134 3135 /* 3136 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 3137 * 229 Entering Extended Passive Mode (|||port|) 3138 */ 3139 void 3140 long_passive(const char *cmd, int pf) 3141 { 3142 socklen_t len; 3143 char *p, *a; 3144 3145 if (!logged_in) { 3146 syslog(LOG_NOTICE, "long passive but not logged in"); 3147 reply(503, "Login with USER first."); 3148 return; 3149 } 3150 3151 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 3152 /* 3153 * XXX: only EPRT/EPSV ready clients will understand this 3154 */ 3155 if (strcmp(cmd, "EPSV") != 0) 3156 reply(501, "Network protocol mismatch"); /*XXX*/ 3157 else 3158 epsv_protounsupp("Network protocol mismatch"); 3159 3160 return; 3161 } 3162 3163 if (pdata >= 0) 3164 close(pdata); 3165 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 3166 if (pdata < 0) { 3167 perror_reply(425, "Can't open passive connection"); 3168 return; 3169 } 3170 pasv_addr = ctrl_addr; 3171 if (bind_pasv_addr() < 0) 3172 goto pasv_error; 3173 len = pasv_addr.su_len; 3174 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 3175 goto pasv_error; 3176 pasv_addr.su_len = len; 3177 if (listen(pdata, 1) < 0) 3178 goto pasv_error; 3179 p = (char *) &pasv_addr.su_port; 3180 3181 #define UC(b) (((int) b) & 0xff) 3182 3183 if (strcmp(cmd, "LPSV") == 0) { 3184 struct sockinet *advert; 3185 3186 if (curclass.advertise.su_len != 0) 3187 advert = &curclass.advertise; 3188 else 3189 advert = &pasv_addr; 3190 switch (advert->su_family) { 3191 case AF_INET: 3192 a = (char *) &advert->su_addr; 3193 reply(228, 3194 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3195 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3196 2, UC(p[0]), UC(p[1])); 3197 return; 3198 #ifdef INET6 3199 case AF_INET6: 3200 a = (char *) &advert->su_6addr; 3201 reply(228, 3202 "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)", 3203 6, 16, 3204 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3205 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3206 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3207 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3208 2, UC(p[0]), UC(p[1])); 3209 return; 3210 #endif 3211 } 3212 #undef UC 3213 } else if (strcmp(cmd, "EPSV") == 0) { 3214 switch (pasv_addr.su_family) { 3215 case AF_INET: 3216 #ifdef INET6 3217 case AF_INET6: 3218 #endif 3219 reply(229, "Entering Extended Passive Mode (|||%d|)", 3220 ntohs(pasv_addr.su_port)); 3221 return; 3222 } 3223 } else { 3224 /* more proper error code? */ 3225 } 3226 3227 pasv_error: 3228 (void) close(pdata); 3229 pdata = -1; 3230 perror_reply(425, "Can't open passive connection"); 3231 return; 3232 } 3233 3234 int 3235 extended_port(const char *arg) 3236 { 3237 char *tmp = NULL; 3238 char *result[3]; 3239 char *p, *q; 3240 char delim; 3241 struct addrinfo hints; 3242 struct addrinfo *res = NULL; 3243 int i; 3244 unsigned long proto; 3245 3246 tmp = ftpd_strdup(arg); 3247 p = tmp; 3248 delim = p[0]; 3249 p++; 3250 memset(result, 0, sizeof(result)); 3251 for (i = 0; i < 3; i++) { 3252 q = strchr(p, delim); 3253 if (!q || *q != delim) 3254 goto parsefail; 3255 *q++ = '\0'; 3256 result[i] = p; 3257 p = q; 3258 } 3259 3260 /* some more sanity checks */ 3261 errno = 0; 3262 p = NULL; 3263 (void)strtoul(result[2], &p, 10); 3264 if (errno || !*result[2] || *p) 3265 goto parsefail; 3266 errno = 0; 3267 p = NULL; 3268 proto = strtoul(result[0], &p, 10); 3269 if (errno || !*result[0] || *p) 3270 goto protounsupp; 3271 3272 memset(&hints, 0, sizeof(hints)); 3273 hints.ai_family = epsvproto2af((int)proto); 3274 if (hints.ai_family < 0) 3275 goto protounsupp; 3276 hints.ai_socktype = SOCK_STREAM; 3277 hints.ai_flags = AI_NUMERICHOST; 3278 if (getaddrinfo(result[1], result[2], &hints, &res)) 3279 goto parsefail; 3280 if (res->ai_next) 3281 goto parsefail; 3282 if (sizeof(data_dest) < res->ai_addrlen) 3283 goto parsefail; 3284 memcpy(&data_dest.si_su, res->ai_addr, res->ai_addrlen); 3285 data_dest.su_len = res->ai_addrlen; 3286 #ifdef INET6 3287 if (his_addr.su_family == AF_INET6 && 3288 data_dest.su_family == AF_INET6) { 3289 /* XXX: more sanity checks! */ 3290 data_dest.su_scope_id = his_addr.su_scope_id; 3291 } 3292 #endif 3293 3294 if (tmp != NULL) 3295 free(tmp); 3296 if (res) 3297 freeaddrinfo(res); 3298 return 0; 3299 3300 parsefail: 3301 reply(500, "Invalid argument, rejected."); 3302 usedefault = 1; 3303 if (tmp != NULL) 3304 free(tmp); 3305 if (res) 3306 freeaddrinfo(res); 3307 return -1; 3308 3309 protounsupp: 3310 epsv_protounsupp("Protocol not supported"); 3311 usedefault = 1; 3312 if (tmp != NULL) 3313 free(tmp); 3314 return -1; 3315 } 3316 3317 /* 3318 * 522 Protocol not supported (proto,...) 3319 * as we assume address family for control and data connections are the same, 3320 * we do not return the list of address families we support - instead, we 3321 * return the address family of the control connection. 3322 */ 3323 void 3324 epsv_protounsupp(const char *message) 3325 { 3326 int proto; 3327 3328 proto = af2epsvproto(ctrl_addr.su_family); 3329 if (proto < 0) 3330 reply(501, "%s", message); /* XXX */ 3331 else 3332 reply(522, "%s, use (%d)", message, proto); 3333 } 3334 3335 /* 3336 * Generate unique name for file with basename "local". 3337 * The file named "local" is already known to exist. 3338 * Generates failure reply on error. 3339 * 3340 * XXX: this function should under go changes similar to 3341 * the mktemp(3)/mkstemp(3) changes. 3342 */ 3343 static char * 3344 gunique(const char *local) 3345 { 3346 static char new[MAXPATHLEN]; 3347 struct stat st; 3348 char *cp; 3349 int count; 3350 3351 cp = strrchr(local, '/'); 3352 if (cp) 3353 *cp = '\0'; 3354 if (stat(cp ? local : ".", &st) < 0) { 3355 perror_reply(553, cp ? local : "."); 3356 return (NULL); 3357 } 3358 if (cp) 3359 *cp = '/'; 3360 for (count = 1; count < 100; count++) { 3361 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 3362 if (stat(new, &st) < 0) 3363 return (new); 3364 } 3365 reply(452, "Unique file name cannot be created."); 3366 return (NULL); 3367 } 3368 3369 /* 3370 * Format and send reply containing system error number. 3371 */ 3372 void 3373 perror_reply(int code, const char *string) 3374 { 3375 int save_errno; 3376 3377 save_errno = errno; 3378 reply(code, "%s: %s.", string, strerror(errno)); 3379 errno = save_errno; 3380 } 3381 3382 static char *onefile[] = { 3383 NULL, 3384 0 3385 }; 3386 3387 void 3388 send_file_list(const char *whichf) 3389 { 3390 struct stat st; 3391 DIR *dirp; 3392 struct dirent *dir; 3393 FILE *volatile dout; 3394 char **volatile dirlist; 3395 char *dirname, *p; 3396 char *notglob; 3397 int volatile simple; 3398 int volatile freeglob; 3399 glob_t gl; 3400 3401 dirp = NULL; 3402 dout = NULL; 3403 notglob = NULL; 3404 simple = 0; 3405 freeglob = 0; 3406 urgflag = 0; 3407 3408 p = NULL; 3409 if (strpbrk(whichf, "~{[*?") != NULL) { 3410 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; 3411 3412 memset(&gl, 0, sizeof(gl)); 3413 freeglob = 1; 3414 if (glob(whichf, flags, 0, &gl)) { 3415 reply(450, "Not found"); 3416 goto cleanup_send_file_list; 3417 } else if (gl.gl_pathc == 0) { 3418 errno = ENOENT; 3419 perror_reply(450, whichf); 3420 goto cleanup_send_file_list; 3421 } 3422 dirlist = gl.gl_pathv; 3423 } else { 3424 notglob = ftpd_strdup(whichf); 3425 onefile[0] = notglob; 3426 dirlist = onefile; 3427 simple = 1; 3428 } 3429 /* XXX: } for vi sm */ 3430 3431 while ((dirname = *dirlist++) != NULL) { 3432 int trailingslash = 0; 3433 3434 if (stat(dirname, &st) < 0) { 3435 /* 3436 * If user typed "ls -l", etc, and the client 3437 * used NLST, do what the user meant. 3438 */ 3439 /* XXX: nuke this support? */ 3440 if (dirname[0] == '-' && *dirlist == NULL && 3441 transflag == 0) { 3442 const char *argv[] = { INTERNAL_LS, "", NULL }; 3443 3444 argv[1] = dirname; 3445 retrieve(argv, dirname); 3446 goto cleanup_send_file_list; 3447 } 3448 perror_reply(450, whichf); 3449 goto cleanup_send_file_list; 3450 } 3451 3452 if (S_ISREG(st.st_mode)) { 3453 /* 3454 * XXXRFC: 3455 * should we follow RFC959 and not work 3456 * for non directories? 3457 */ 3458 if (dout == NULL) { 3459 dout = dataconn("file list", (off_t)-1, "w"); 3460 if (dout == NULL) 3461 goto cleanup_send_file_list; 3462 transflag = 1; 3463 } 3464 cprintf(dout, "%s%s\n", dirname, 3465 type == TYPE_A ? "\r" : ""); 3466 continue; 3467 } else if (!S_ISDIR(st.st_mode)) 3468 continue; 3469 3470 if (dirname[strlen(dirname) - 1] == '/') 3471 trailingslash++; 3472 3473 if ((dirp = opendir(dirname)) == NULL) 3474 continue; 3475 3476 while ((dir = readdir(dirp)) != NULL) { 3477 char nbuf[MAXPATHLEN]; 3478 3479 if (urgflag && handleoobcmd()) 3480 goto cleanup_send_file_list; 3481 3482 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 3483 continue; 3484 3485 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 3486 trailingslash ? "" : "/", dir->d_name); 3487 3488 /* 3489 * We have to do a stat to ensure it's 3490 * not a directory or special file. 3491 */ 3492 /* 3493 * XXXRFC: 3494 * should we follow RFC959 and filter out 3495 * non files ? lukem - NO!, or not until 3496 * our ftp client uses MLS{T,D} for completion. 3497 */ 3498 if (simple || (stat(nbuf, &st) == 0 && 3499 S_ISREG(st.st_mode))) { 3500 if (dout == NULL) { 3501 dout = dataconn("file list", (off_t)-1, 3502 "w"); 3503 if (dout == NULL) 3504 goto cleanup_send_file_list; 3505 transflag = 1; 3506 } 3507 p = nbuf; 3508 if (nbuf[0] == '.' && nbuf[1] == '/') 3509 p = &nbuf[2]; 3510 cprintf(dout, "%s%s\n", p, 3511 type == TYPE_A ? "\r" : ""); 3512 } 3513 } 3514 (void) closedir(dirp); 3515 } 3516 3517 if (dout == NULL) 3518 reply(450, "No files found."); 3519 else if (ferror(dout) != 0) 3520 perror_reply(451, "Data connection"); 3521 else 3522 reply(226, "Transfer complete."); 3523 3524 cleanup_send_file_list: 3525 closedataconn(dout); 3526 transflag = 0; 3527 urgflag = 0; 3528 total_xfers++; 3529 total_xfers_out++; 3530 if (notglob) 3531 free(notglob); 3532 if (freeglob) 3533 globfree(&gl); 3534 } 3535 3536 char * 3537 conffilename(const char *s) 3538 { 3539 static char filename[MAXPATHLEN]; 3540 3541 if (*s == '/') 3542 strlcpy(filename, s, sizeof(filename)); 3543 else 3544 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 3545 return (filename); 3546 } 3547 3548 /* 3549 * logxfer -- 3550 * if logging > 1, then based on the arguments, syslog a message: 3551 * if bytes != -1 "<command> <file1> = <bytes> bytes" 3552 * else if file2 != NULL "<command> <file1> <file2>" 3553 * else "<command> <file1>" 3554 * if elapsed != NULL, append "in xxx.yyy seconds" 3555 * if error != NULL, append ": " + error 3556 * 3557 * if doxferlog != 0, bytes != -1, and command is "get", "put", 3558 * or "append", syslog and/or write a wu-ftpd style xferlog entry 3559 */ 3560 void 3561 logxfer(const char *command, off_t bytes, const char *file1, const char *file2, 3562 const struct timeval *elapsed, const char *error) 3563 { 3564 char buf[MAXPATHLEN * 2 + 100]; 3565 char realfile1[MAXPATHLEN], realfile2[MAXPATHLEN]; 3566 const char *r1, *r2; 3567 char direction; 3568 size_t len; 3569 time_t now; 3570 3571 if (logging <=1 && !doxferlog) 3572 return; 3573 3574 r1 = r2 = NULL; 3575 if ((r1 = realpath(file1, realfile1)) == NULL) 3576 r1 = file1; 3577 if (file2 != NULL) 3578 if ((r2 = realpath(file2, realfile2)) == NULL) 3579 r2 = file2; 3580 3581 /* 3582 * syslog command 3583 */ 3584 if (logging > 1) { 3585 len = snprintf(buf, sizeof(buf), "%s %s", command, r1); 3586 if (bytes != (off_t)-1) 3587 len += snprintf(buf + len, sizeof(buf) - len, 3588 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 3589 else if (r2 != NULL) 3590 len += snprintf(buf + len, sizeof(buf) - len, 3591 " %s", r2); 3592 if (elapsed != NULL) 3593 len += snprintf(buf + len, sizeof(buf) - len, 3594 " in " LLF ".%.03ld seconds", 3595 (LLT)elapsed->tv_sec, 3596 (long)(elapsed->tv_usec / 1000)); 3597 if (error != NULL) 3598 len += snprintf(buf + len, sizeof(buf) - len, 3599 ": %s", error); 3600 syslog(LOG_INFO, "%s", buf); 3601 } 3602 3603 /* 3604 * syslog wu-ftpd style log entry, prefixed with "xferlog: " 3605 */ 3606 if (!doxferlog || bytes == -1) 3607 return; 3608 3609 if (strcmp(command, "get") == 0) 3610 direction = 'o'; 3611 else if (strcmp(command, "put") == 0 || strcmp(command, "append") == 0) 3612 direction = 'i'; 3613 else 3614 return; 3615 3616 time(&now); 3617 len = snprintf(buf, sizeof(buf), 3618 "%.24s " LLF " %s " LLF " %s %c %s %c %c %s FTP 0 * %c\n", 3619 3620 /* 3621 * XXX: wu-ftpd puts ' (send)' or ' (recv)' in the syslog message, and removes 3622 * the full date. This may be problematic for accurate log parsing, 3623 * given that syslog messages don't contain the full date. 3624 */ 3625 ctime(&now), 3626 (LLT) 3627 (elapsed == NULL ? 0 : elapsed->tv_sec + (elapsed->tv_usec > 0)), 3628 remotehost, 3629 (LLT) bytes, 3630 r1, 3631 type == TYPE_A ? 'a' : 'b', 3632 "_", /* XXX: take conversions into account? */ 3633 direction, 3634 3635 curclass.type == CLASS_GUEST ? 'a' : 3636 curclass.type == CLASS_CHROOT ? 'g' : 3637 curclass.type == CLASS_REAL ? 'r' : '?', 3638 3639 curclass.type == CLASS_GUEST ? pw->pw_passwd : pw->pw_name, 3640 error != NULL ? 'i' : 'c' 3641 ); 3642 3643 if ((doxferlog & 2) && xferlogfd != -1) 3644 write(xferlogfd, buf, len); 3645 if ((doxferlog & 1)) { 3646 buf[len-1] = '\n'; /* strip \n from syslog message */ 3647 syslog(LOG_INFO, "xferlog: %s", buf); 3648 } 3649 } 3650 3651 /* 3652 * Log the resource usage. 3653 * 3654 * XXX: more resource usage to logging? 3655 */ 3656 void 3657 logrusage(const struct rusage *rusage_before, 3658 const struct rusage *rusage_after) 3659 { 3660 struct timeval usrtime, systime; 3661 3662 if (logging <= 1) 3663 return; 3664 3665 timersub(&rusage_after->ru_utime, &rusage_before->ru_utime, &usrtime); 3666 timersub(&rusage_after->ru_stime, &rusage_before->ru_stime, &systime); 3667 syslog(LOG_INFO, LLF ".%.03ldu " LLF ".%.03lds %ld+%ldio %ldpf+%ldw", 3668 (LLT)usrtime.tv_sec, (long)(usrtime.tv_usec / 1000), 3669 (LLT)systime.tv_sec, (long)(systime.tv_usec / 1000), 3670 rusage_after->ru_inblock - rusage_before->ru_inblock, 3671 rusage_after->ru_oublock - rusage_before->ru_oublock, 3672 rusage_after->ru_majflt - rusage_before->ru_majflt, 3673 rusage_after->ru_nswap - rusage_before->ru_nswap); 3674 } 3675 3676 /* 3677 * Determine if `password' is valid for user given in `pw'. 3678 * Returns 2 if password expired, 1 if otherwise failed, 0 if ok 3679 */ 3680 int 3681 checkpassword(const struct passwd *pwent, const char *password) 3682 { 3683 const char *orig; 3684 char *new; 3685 time_t change, expire, now; 3686 3687 change = expire = 0; 3688 if (pwent == NULL) 3689 return 1; 3690 3691 time(&now); 3692 orig = pwent->pw_passwd; /* save existing password */ 3693 expire = pwent->pw_expire; 3694 change = pwent->pw_change; 3695 if (change == _PASSWORD_CHGNOW) 3696 change = now; 3697 3698 if (orig[0] == '\0') /* don't allow empty passwords */ 3699 return 1; 3700 3701 new = crypt(password, orig); /* encrypt given password */ 3702 if (strcmp(new, orig) != 0) /* compare */ 3703 return 1; 3704 3705 if ((expire && now >= expire) || (change && now >= change)) 3706 return 2; /* check if expired */ 3707 3708 return 0; /* OK! */ 3709 } 3710 3711 char * 3712 ftpd_strdup(const char *s) 3713 { 3714 char *new = strdup(s); 3715 3716 if (new == NULL) 3717 fatal("Local resource failure: malloc"); 3718 /* NOTREACHED */ 3719 return (new); 3720 } 3721 3722 /* 3723 * As per fprintf(), but increment total_bytes and total_bytes_out, 3724 * by the appropriate amount. 3725 */ 3726 void 3727 cprintf(FILE *fd, const char *fmt, ...) 3728 { 3729 off_t b; 3730 va_list ap; 3731 3732 va_start(ap, fmt); 3733 b = vfprintf(fd, fmt, ap); 3734 va_end(ap); 3735 total_bytes += b; 3736 total_bytes_out += b; 3737 } 3738 3739 #ifdef USE_PAM 3740 /* 3741 * the following code is stolen from imap-uw PAM authentication module and 3742 * login.c 3743 */ 3744 typedef struct { 3745 const char *uname; /* user name */ 3746 int triedonce; /* if non-zero, tried before */ 3747 } ftpd_cred_t; 3748 3749 static int 3750 auth_conv(int num_msg, const struct pam_message **msg, 3751 struct pam_response **resp, void *appdata) 3752 { 3753 int i, ret; 3754 size_t n; 3755 ftpd_cred_t *cred = (ftpd_cred_t *) appdata; 3756 struct pam_response *myreply; 3757 char pbuf[FTP_BUFLEN]; 3758 3759 if (num_msg <= 0 || num_msg > PAM_MAX_NUM_MSG) 3760 return (PAM_CONV_ERR); 3761 myreply = calloc(num_msg, sizeof *myreply); 3762 if (myreply == NULL) 3763 return PAM_BUF_ERR; 3764 3765 for (i = 0; i < num_msg; i++) { 3766 myreply[i].resp_retcode = 0; 3767 myreply[i].resp = NULL; 3768 switch (msg[i]->msg_style) { 3769 case PAM_PROMPT_ECHO_ON: /* user */ 3770 myreply[i].resp = ftpd_strdup(cred->uname); 3771 /* PAM frees resp. */ 3772 break; 3773 case PAM_PROMPT_ECHO_OFF: /* authtok (password) */ 3774 /* 3775 * Only send a single 331 reply and 3776 * then expect a PASS. 3777 */ 3778 if (cred->triedonce) { 3779 syslog(LOG_ERR, 3780 "auth_conv: already performed PAM_PROMPT_ECHO_OFF"); 3781 goto fail; 3782 } 3783 cred->triedonce++; 3784 if (msg[i]->msg[0] == '\0') { 3785 (void)strlcpy(pbuf, "password", sizeof(pbuf)); 3786 } else { 3787 /* Uncapitalize msg */ 3788 (void)strlcpy(pbuf, msg[i]->msg, sizeof(pbuf)); 3789 if (isupper((unsigned char)pbuf[0])) 3790 pbuf[0] = tolower( 3791 (unsigned char)pbuf[0]); 3792 /* Remove trailing ':' and whitespace */ 3793 n = strlen(pbuf); 3794 while (n-- > 0) { 3795 if (isspace((unsigned char)pbuf[n]) || 3796 pbuf[n] == ':') 3797 pbuf[n] = '\0'; 3798 else 3799 break; 3800 } 3801 } 3802 /* Send reply, wait for a response. */ 3803 reply(331, "User %s accepted, provide %s.", 3804 cred->uname, pbuf); 3805 (void) alarm(curclass.timeout); 3806 ret = get_line(pbuf, sizeof(pbuf)-1, stdin); 3807 (void) alarm(0); 3808 if (ret == -1) { 3809 reply(221, "You could at least say goodbye."); 3810 dologout(0); 3811 } else if (ret == -2) { 3812 /* XXX: should we do this reply(-530, ..) ? */ 3813 reply(-530, "Command too long."); 3814 goto fail; 3815 } 3816 /* Ensure it is PASS */ 3817 if (strncasecmp(pbuf, "PASS ", 5) != 0) { 3818 syslog(LOG_ERR, 3819 "auth_conv: unexpected reply '%.4s'", pbuf); 3820 /* XXX: should we do this reply(-530, ..) ? */ 3821 reply(-530, "Unexpected reply '%.4s'.", pbuf); 3822 goto fail; 3823 } 3824 /* Strip CRLF from "PASS" reply */ 3825 n = strlen(pbuf); 3826 while (--n >= 5 && 3827 (pbuf[n] == '\r' || pbuf[n] == '\n')) 3828 pbuf[n] = '\0'; 3829 /* Copy password into reply */ 3830 myreply[i].resp = ftpd_strdup(pbuf+5); 3831 /* PAM frees resp. */ 3832 break; 3833 case PAM_TEXT_INFO: 3834 case PAM_ERROR_MSG: 3835 break; 3836 default: /* unknown message style */ 3837 goto fail; 3838 } 3839 } 3840 3841 *resp = myreply; 3842 return PAM_SUCCESS; 3843 3844 fail: 3845 free(myreply); 3846 *resp = NULL; 3847 return PAM_CONV_ERR; 3848 } 3849 3850 /* 3851 * Attempt to authenticate the user using PAM. Returns 0 if the user is 3852 * authenticated, or 1 if not authenticated. If some sort of PAM system 3853 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 3854 * function returns -1. This can be used as an indication that we should 3855 * fall back to a different authentication mechanism. 3856 * pw maybe be updated to a new user if PAM_USER changes from curname. 3857 */ 3858 static int 3859 auth_pam(void) 3860 { 3861 const char *tmpl_user; 3862 const void *item; 3863 int rval; 3864 int e; 3865 ftpd_cred_t auth_cred = { curname, 0 }; 3866 struct pam_conv conv = { &auth_conv, &auth_cred }; 3867 3868 e = pam_start("ftpd", curname, &conv, &pamh); 3869 if (e != PAM_SUCCESS) { 3870 /* 3871 * In OpenPAM, it's OK to pass NULL to pam_strerror() 3872 * if context creation has failed in the first place. 3873 */ 3874 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 3875 return -1; 3876 } 3877 3878 e = pam_set_item(pamh, PAM_RHOST, remotehost); 3879 if (e != PAM_SUCCESS) { 3880 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 3881 pam_strerror(pamh, e)); 3882 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3883 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3884 } 3885 pamh = NULL; 3886 return -1; 3887 } 3888 3889 e = pam_set_item(pamh, PAM_SOCKADDR, &his_addr); 3890 if (e != PAM_SUCCESS) { 3891 syslog(LOG_ERR, "pam_set_item(PAM_SOCKADDR): %s", 3892 pam_strerror(pamh, e)); 3893 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3894 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3895 } 3896 pamh = NULL; 3897 return -1; 3898 } 3899 3900 e = pam_authenticate(pamh, 0); 3901 if (ftpd_debug) 3902 syslog(LOG_DEBUG, "pam_authenticate: user '%s' returned %d", 3903 curname, e); 3904 switch (e) { 3905 case PAM_SUCCESS: 3906 /* 3907 * With PAM we support the concept of a "template" 3908 * user. The user enters a login name which is 3909 * authenticated by PAM, usually via a remote service 3910 * such as RADIUS or TACACS+. If authentication 3911 * succeeds, a different but related "template" name 3912 * is used for setting the credentials, shell, and 3913 * home directory. The name the user enters need only 3914 * exist on the remote authentication server, but the 3915 * template name must be present in the local password 3916 * database. 3917 * 3918 * This is supported by two various mechanisms in the 3919 * individual modules. However, from the application's 3920 * point of view, the template user is always passed 3921 * back as a changed value of the PAM_USER item. 3922 */ 3923 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 3924 PAM_SUCCESS) { 3925 tmpl_user = (const char *) item; 3926 if (pw == NULL 3927 || strcmp(pw->pw_name, tmpl_user) != 0) { 3928 pw = sgetpwnam(tmpl_user); 3929 if (ftpd_debug) 3930 syslog(LOG_DEBUG, 3931 "auth_pam: PAM changed " 3932 "user from '%s' to '%s'", 3933 curname, pw->pw_name); 3934 (void)strlcpy(curname, pw->pw_name, 3935 curname_len); 3936 } 3937 } else 3938 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 3939 pam_strerror(pamh, e)); 3940 rval = 0; 3941 break; 3942 3943 case PAM_AUTH_ERR: 3944 case PAM_USER_UNKNOWN: 3945 case PAM_MAXTRIES: 3946 rval = 1; 3947 break; 3948 3949 default: 3950 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 3951 rval = -1; 3952 break; 3953 } 3954 3955 if (rval == 0) { 3956 e = pam_acct_mgmt(pamh, 0); 3957 if (e != PAM_SUCCESS) { 3958 syslog(LOG_ERR, "pam_acct_mgmt: %s", 3959 pam_strerror(pamh, e)); 3960 rval = 1; 3961 } 3962 } 3963 3964 if (rval != 0) { 3965 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3966 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3967 } 3968 pamh = NULL; 3969 } 3970 return rval; 3971 } 3972 3973 #endif /* USE_PAM */ 3974