ftpd.c revision 1.204.4.1
1 /* $NetBSD: ftpd.c,v 1.204.4.1 2023/10/02 17:09:41 martin 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 1.204.4.1 2023/10/02 17:09:41 martin Exp $"); 101 #endif 102 #endif /* not lint */ 103 104 /* 105 * FTP server. 106 */ 107 #include <sys/param.h> 108 #include <sys/stat.h> 109 #include <sys/ioctl.h> 110 #include <sys/socket.h> 111 #include <sys/wait.h> 112 #include <sys/mman.h> 113 #include <sys/resource.h> 114 115 #include <netinet/in.h> 116 #include <netinet/in_systm.h> 117 #include <netinet/ip.h> 118 119 #define FTP_NAMES 120 #include <arpa/ftp.h> 121 #include <arpa/inet.h> 122 #include <arpa/telnet.h> 123 124 #include <ctype.h> 125 #include <dirent.h> 126 #include <err.h> 127 #include <errno.h> 128 #include <fcntl.h> 129 #include <fnmatch.h> 130 #include <glob.h> 131 #include <grp.h> 132 #include <limits.h> 133 #include <netdb.h> 134 #include <pwd.h> 135 #include <poll.h> 136 #include <signal.h> 137 #include <stdarg.h> 138 #include <stdio.h> 139 #include <stdlib.h> 140 #include <string.h> 141 #include <syslog.h> 142 #include <time.h> 143 #include <tzfile.h> 144 #include <unistd.h> 145 #include <util.h> 146 #ifdef SUPPORT_UTMP 147 #include <utmp.h> 148 #endif 149 #ifdef SUPPORT_UTMPX 150 #include <utmpx.h> 151 #endif 152 #ifdef SKEY 153 #include <skey.h> 154 #endif 155 #ifdef KERBEROS5 156 #include <com_err.h> 157 #include <krb5/krb5.h> 158 #endif 159 160 #ifdef LOGIN_CAP 161 #include <login_cap.h> 162 #endif 163 164 #ifdef USE_PAM 165 #include <security/pam_appl.h> 166 #endif 167 168 #include "pfilter.h" 169 170 #define GLOBAL 171 #include "extern.h" 172 #include "pathnames.h" 173 #include "version.h" 174 175 static sig_atomic_t transflag; 176 static sig_atomic_t urgflag; 177 178 int data; 179 int Dflag; 180 int fflag; 181 int sflag; 182 int stru; /* avoid C keyword */ 183 int mode; 184 int dataport; /* use specific data port */ 185 int dopidfile; /* maintain pid file */ 186 int doutmp; /* update utmp file */ 187 int dowtmp; /* update wtmp file */ 188 int doxferlog; /* syslog/write wu-ftpd style xferlog entries */ 189 int xferlogfd; /* fd to write wu-ftpd xferlog entries to */ 190 int getnameopts; /* flags for use with getname() */ 191 int dropprivs; /* if privileges should or have been dropped */ 192 int mapped; /* IPv4 connection on AF_INET6 socket */ 193 off_t file_size; 194 off_t byte_count; 195 static char ttyline[20]; 196 197 #ifdef USE_PAM 198 static int auth_pam(void); 199 pam_handle_t *pamh = NULL; 200 #endif 201 202 #ifdef SUPPORT_UTMP 203 static struct utmp utmp; /* for utmp */ 204 #endif 205 #ifdef SUPPORT_UTMPX 206 static struct utmpx utmpx; /* for utmpx */ 207 #endif 208 209 static const char *anondir = NULL; 210 static const char *confdir = _DEFAULT_CONFDIR; 211 212 static char *curname; /* current USER name */ 213 static size_t curname_len; /* length of curname (include NUL) */ 214 215 #if defined(KERBEROS) || defined(KERBEROS5) 216 int has_ccache = 0; 217 int notickets = 1; 218 char *krbtkfile_env = NULL; 219 char *tty = ttyline; 220 int login_krb5_forwardable_tgt = 0; 221 #endif 222 223 int epsvall = 0; 224 225 /* 226 * Timeout intervals for retrying connections 227 * to hosts that don't accept PORT cmds. This 228 * is a kludge, but given the problems with TCP... 229 */ 230 #define SWAITMAX 90 /* wait at most 90 seconds */ 231 #define SWAITINT 5 /* interval between retries */ 232 233 int swaitmax = SWAITMAX; 234 int swaitint = SWAITINT; 235 236 enum send_status { 237 SS_SUCCESS, 238 SS_ABORTED, /* transfer aborted */ 239 SS_NO_TRANSFER, /* no transfer made yet */ 240 SS_FILE_ERROR, /* file read error */ 241 SS_DATA_ERROR /* data send error */ 242 }; 243 244 static int bind_pasv_addr(void); 245 static int checkuser(const char *, const char *, int, int, char **); 246 static int checkaccess(const char *); 247 static int checkpassword(const struct passwd *, const char *); 248 static void do_pass(int, int, const char *); 249 static void end_login(void); 250 static FILE *getdatasock(const char *); 251 static char *gunique(const char *); 252 static void login_utmp(const char *, const char *, const char *, 253 struct sockinet *); 254 static void logremotehost(struct sockinet *); 255 __dead static void lostconn(int); 256 __dead static void toolong(int); 257 __dead static void sigquit(int); 258 static void sigurg(int); 259 static int handleoobcmd(void); 260 static int receive_data(FILE *, FILE *); 261 static int send_data(FILE *, FILE *, const struct stat *, int); 262 static struct passwd *sgetpwnam(const char *); 263 static int write_data(int, char *, size_t, off_t *, struct timeval *, 264 int); 265 static enum send_status 266 send_data_with_read(int, int, const struct stat *, int); 267 static enum send_status 268 send_data_with_mmap(int, int, const struct stat *, int); 269 static void logrusage(const struct rusage *, const struct rusage *); 270 static void logout_utmp(void); 271 272 int main(int, char *[]); 273 274 #if defined(KERBEROS) 275 int klogin(struct passwd *, char *, char *, char *); 276 void kdestroy(void); 277 #endif 278 #if defined(KERBEROS5) 279 int k5login(struct passwd *, char *, char *, char *); 280 void k5destroy(void); 281 #endif 282 283 int 284 main(int argc, char *argv[]) 285 { 286 int ch, on = 1, tos, keepalive; 287 socklen_t addrlen; 288 #ifdef KERBEROS5 289 krb5_error_code kerror; 290 #endif 291 char *p; 292 const char *xferlogname = NULL; 293 long l; 294 struct sigaction sa; 295 sa_family_t af = AF_UNSPEC; 296 297 connections = 1; 298 ftpd_debug = 0; 299 logging = 0; 300 pdata = -1; 301 Dflag = 0; 302 fflag = 0; 303 sflag = 0; 304 dataport = 0; 305 dopidfile = 1; /* default: DO use a pid file to count users */ 306 doutmp = 0; /* default: Do NOT log to utmp */ 307 dowtmp = 1; /* default: DO log to wtmp */ 308 doxferlog = 0; /* default: Do NOT syslog xferlog */ 309 xferlogfd = -1; /* default: Do NOT write xferlog file */ 310 getnameopts = 0; /* default: xlate addrs to name */ 311 dropprivs = 0; 312 mapped = 0; 313 usedefault = 1; 314 emailaddr = NULL; 315 hostname[0] = '\0'; 316 homedir[0] = '\0'; 317 gidcount = 0; 318 is_oob = 0; 319 version = FTPD_VERSION; 320 321 /* 322 * LOG_NDELAY sets up the logging connection immediately, 323 * necessary for anonymous ftp's that chroot and can't do it later. 324 */ 325 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 326 327 while ((ch = getopt(argc, argv, 328 "46a:c:C:Dde:fh:HlL:nP:qQrst:T:uUvV:wWX")) != -1) { 329 switch (ch) { 330 case '4': 331 af = AF_INET; 332 break; 333 334 case '6': 335 af = AF_INET6; 336 break; 337 338 case 'a': 339 anondir = optarg; 340 break; 341 342 case 'c': 343 confdir = optarg; 344 break; 345 346 case 'C': 347 if ((p = strchr(optarg, '@')) != NULL) { 348 *p++ = '\0'; 349 strlcpy(remotehost, p, MAXHOSTNAMELEN + 1); 350 if (inet_pton(AF_INET, p, 351 &his_addr.su_addr) == 1) { 352 his_addr.su_family = AF_INET; 353 his_addr.su_len = 354 sizeof(his_addr.si_su.su_sin); 355 #ifdef INET6 356 } else if (inet_pton(AF_INET6, p, 357 &his_addr.su_6addr) == 1) { 358 his_addr.su_family = AF_INET6; 359 his_addr.su_len = 360 sizeof(his_addr.si_su.su_sin6); 361 #endif 362 } else 363 his_addr.su_family = AF_UNSPEC; 364 } 365 pw = sgetpwnam(optarg); 366 exit(checkaccess(optarg) ? 0 : 1); 367 /* NOTREACHED */ 368 369 case 'D': 370 Dflag = 1; 371 break; 372 373 case 'd': 374 case 'v': /* deprecated */ 375 ftpd_debug = 1; 376 break; 377 378 case 'e': 379 emailaddr = optarg; 380 break; 381 382 case 'f': 383 fflag = 1; 384 break; 385 386 case 'h': 387 strlcpy(hostname, optarg, sizeof(hostname)); 388 break; 389 390 case 'H': 391 if (gethostname(hostname, sizeof(hostname)) == -1) 392 hostname[0] = '\0'; 393 hostname[sizeof(hostname) - 1] = '\0'; 394 break; 395 396 case 'l': 397 logging++; /* > 1 == extra logging */ 398 break; 399 400 case 'L': 401 xferlogname = optarg; 402 break; 403 404 case 'n': 405 getnameopts = NI_NUMERICHOST; 406 break; 407 408 case 'P': 409 errno = 0; 410 p = NULL; 411 l = strtol(optarg, &p, 10); 412 if (errno || *optarg == '\0' || *p != '\0' || 413 l < IPPORT_RESERVED || 414 l > IPPORT_ANONMAX) { 415 syslog(LOG_WARNING, "Invalid dataport %s", 416 optarg); 417 dataport = 0; 418 } 419 dataport = (int)l; 420 break; 421 422 case 'q': 423 dopidfile = 1; 424 break; 425 426 case 'Q': 427 dopidfile = 0; 428 break; 429 430 case 'r': 431 dropprivs = 1; 432 break; 433 434 case 's': 435 sflag = 1; 436 break; 437 438 case 't': 439 case 'T': 440 syslog(LOG_WARNING, 441 "-%c has been deprecated in favour of ftpd.conf", 442 ch); 443 break; 444 445 case 'u': 446 doutmp = 1; 447 break; 448 449 case 'U': 450 doutmp = 0; 451 break; 452 453 case 'V': 454 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 455 version = NULL; 456 else 457 version = ftpd_strdup(optarg); 458 break; 459 460 case 'w': 461 dowtmp = 1; 462 break; 463 464 case 'W': 465 dowtmp = 0; 466 break; 467 468 case 'X': 469 doxferlog |= 1; 470 break; 471 472 default: 473 if (optopt == 'a' || optopt == 'C') 474 exit(1); 475 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 476 break; 477 } 478 } 479 if (EMPTYSTR(confdir)) 480 confdir = _DEFAULT_CONFDIR; 481 482 pfilter_open(); 483 484 if (dowtmp) { 485 #ifdef SUPPORT_UTMPX 486 ftpd_initwtmpx(); 487 #endif 488 #ifdef SUPPORT_UTMP 489 ftpd_initwtmp(); 490 #endif 491 } 492 errno = 0; 493 l = sysconf(_SC_LOGIN_NAME_MAX); 494 if (l == -1 && errno != 0) { 495 syslog(LOG_ERR, "sysconf _SC_LOGIN_NAME_MAX: %m"); 496 exit(1); 497 } else if (l <= 0) { 498 syslog(LOG_WARNING, "using conservative LOGIN_NAME_MAX value"); 499 curname_len = _POSIX_LOGIN_NAME_MAX; 500 } else 501 curname_len = (size_t)l; 502 curname = malloc(curname_len); 503 if (curname == NULL) { 504 syslog(LOG_ERR, "malloc: %m"); 505 exit(1); 506 } 507 curname[0] = '\0'; 508 509 if (Dflag) { 510 int error, fd, i, n, *socks; 511 struct pollfd *fds; 512 struct addrinfo hints, *res, *res0; 513 514 if (!fflag && daemon(1, 0) == -1) { 515 syslog(LOG_ERR, "failed to daemonize: %m"); 516 exit(1); 517 } 518 (void)memset(&sa, 0, sizeof(sa)); 519 sa.sa_handler = SIG_IGN; 520 sa.sa_flags = SA_NOCLDWAIT; 521 sigemptyset(&sa.sa_mask); 522 (void)sigaction(SIGCHLD, &sa, NULL); 523 524 (void)memset(&hints, 0, sizeof(hints)); 525 hints.ai_flags = AI_PASSIVE; 526 hints.ai_family = af; 527 hints.ai_socktype = SOCK_STREAM; 528 error = getaddrinfo(NULL, "ftp", &hints, &res0); 529 if (error) { 530 syslog(LOG_ERR, "getaddrinfo: %s", gai_strerror(error)); 531 exit(1); 532 } 533 534 for (n = 0, res = res0; res != NULL; res = res->ai_next) 535 n++; 536 if (n == 0) { 537 syslog(LOG_ERR, "no addresses available"); 538 exit(1); 539 } 540 socks = malloc(n * sizeof(int)); 541 fds = malloc(n * sizeof(struct pollfd)); 542 if (socks == NULL || fds == NULL) { 543 syslog(LOG_ERR, "malloc: %m"); 544 exit(1); 545 } 546 547 for (n = 0, res = res0; res != NULL; res = res->ai_next) { 548 socks[n] = socket(res->ai_family, res->ai_socktype, 549 res->ai_protocol); 550 if (socks[n] == -1) 551 continue; 552 (void)setsockopt(socks[n], SOL_SOCKET, SO_REUSEADDR, 553 &on, sizeof(on)); 554 if (bind(socks[n], res->ai_addr, res->ai_addrlen) 555 == -1) { 556 (void)close(socks[n]); 557 continue; 558 } 559 if (listen(socks[n], 12) == -1) { 560 (void)close(socks[n]); 561 continue; 562 } 563 564 fds[n].fd = socks[n]; 565 fds[n].events = POLLIN; 566 n++; 567 } 568 if (n == 0) { 569 syslog(LOG_ERR, "%m"); 570 exit(1); 571 } 572 freeaddrinfo(res0); 573 574 if (pidfile(NULL) == -1) 575 syslog(LOG_ERR, "failed to write a pid file: %m"); 576 577 for (;;) { 578 if (poll(fds, n, INFTIM) == -1) { 579 if (errno == EINTR) 580 continue; 581 syslog(LOG_ERR, "poll: %m"); 582 exit(1); 583 } 584 for (i = 0; i < n; i++) { 585 if (fds[i].revents & POLLIN) { 586 fd = accept(fds[i].fd, NULL, NULL); 587 if (fd == -1) { 588 syslog(LOG_ERR, "accept: %m"); 589 continue; 590 } 591 switch (fork()) { 592 case -1: 593 syslog(LOG_ERR, "fork: %m"); 594 break; 595 case 0: 596 goto child; 597 /* NOTREACHED */ 598 } 599 (void)close(fd); 600 } 601 } 602 } 603 child: 604 (void)dup2(fd, STDIN_FILENO); 605 (void)dup2(fd, STDOUT_FILENO); 606 (void)dup2(fd, STDERR_FILENO); 607 for (i = 0; i < n; i++) 608 (void)close(socks[i]); 609 } 610 611 memset((char *)&his_addr, 0, sizeof(his_addr)); 612 addrlen = sizeof(his_addr.si_su); 613 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 614 syslog((errno == ENOTCONN) ? LOG_NOTICE : LOG_ERR, 615 "getpeername (%s): %m",argv[0]); 616 exit(1); 617 } 618 his_addr.su_len = addrlen; 619 memset((char *)&ctrl_addr, 0, sizeof(ctrl_addr)); 620 addrlen = sizeof(ctrl_addr.si_su); 621 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 622 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 623 exit(1); 624 } 625 ctrl_addr.su_len = addrlen; 626 #ifdef INET6 627 if (his_addr.su_family == AF_INET6 628 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 629 #if 1 630 /* 631 * IPv4 control connection arrived to AF_INET6 socket. 632 * I hate to do this, but this is the easiest solution. 633 * 634 * The assumption is untrue on SIIT environment. 635 */ 636 struct sockinet tmp_addr; 637 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 638 639 tmp_addr = his_addr; 640 memset(&his_addr, 0, sizeof(his_addr)); 641 his_addr.su_family = AF_INET; 642 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 643 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 644 sizeof(his_addr.su_addr)); 645 his_addr.su_port = tmp_addr.su_port; 646 647 tmp_addr = ctrl_addr; 648 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 649 ctrl_addr.su_family = AF_INET; 650 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 651 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 652 sizeof(ctrl_addr.su_addr)); 653 ctrl_addr.su_port = tmp_addr.su_port; 654 #else 655 while (fgets(line, sizeof(line), fd) != NULL) { 656 if ((cp = strchr(line, '\n')) != NULL) 657 *cp = '\0'; 658 reply(-530, "%s", line); 659 } 660 (void) fflush(stdout); 661 (void) fclose(fd); 662 reply(530, 663 "Connection from IPv4 mapped address is not supported."); 664 exit(0); 665 #endif 666 667 mapped = 1; 668 } else 669 #endif /* INET6 */ 670 mapped = 0; 671 #ifdef IP_TOS 672 if (!mapped && his_addr.su_family == AF_INET) { 673 tos = IPTOS_LOWDELAY; 674 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 675 sizeof(int)) < 0) 676 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 677 } 678 #endif 679 /* if the hostname hasn't been given, attempt to determine it */ 680 if (hostname[0] == '\0') { 681 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 682 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 683 getnameopts) != 0) 684 (void)gethostname(hostname, sizeof(hostname)); 685 hostname[sizeof(hostname) - 1] = '\0'; 686 } 687 688 /* set this here so klogin can use it... */ 689 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 690 691 (void) freopen(_PATH_DEVNULL, "w", stderr); 692 693 memset(&sa, 0, sizeof(sa)); 694 sa.sa_handler = SIG_DFL; 695 sa.sa_flags = SA_RESTART; 696 sigemptyset(&sa.sa_mask); 697 (void) sigaction(SIGCHLD, &sa, NULL); 698 699 sa.sa_handler = sigquit; 700 sa.sa_flags = SA_RESTART; 701 sigfillset(&sa.sa_mask); /* block all sigs in these handlers */ 702 (void) sigaction(SIGHUP, &sa, NULL); 703 (void) sigaction(SIGINT, &sa, NULL); 704 (void) sigaction(SIGQUIT, &sa, NULL); 705 (void) sigaction(SIGTERM, &sa, NULL); 706 sa.sa_handler = lostconn; 707 (void) sigaction(SIGPIPE, &sa, NULL); 708 sa.sa_handler = toolong; 709 (void) sigaction(SIGALRM, &sa, NULL); 710 sa.sa_handler = sigurg; 711 (void) sigaction(SIGURG, &sa, NULL); 712 713 /* Try to handle urgent data inline */ 714 #ifdef SO_OOBINLINE 715 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 716 syslog(LOG_WARNING, "setsockopt: %m"); 717 #endif 718 /* Set keepalives on the socket to detect dropped connections. */ 719 #ifdef SO_KEEPALIVE 720 keepalive = 1; 721 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 722 sizeof(int)) < 0) 723 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 724 #endif 725 726 #ifdef F_SETOWN 727 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 728 syslog(LOG_WARNING, "fcntl F_SETOWN: %m"); 729 #endif 730 logremotehost(&his_addr); 731 /* 732 * Set up default state 733 */ 734 data = -1; 735 type = TYPE_A; 736 form = FORM_N; 737 stru = STRU_F; 738 mode = MODE_S; 739 tmpline[0] = '\0'; 740 hasyyerrored = 0; 741 742 #ifdef KERBEROS5 743 kerror = krb5_init_context(&kcontext); 744 if (kerror) { 745 syslog(LOG_ERR, "%s when initializing Kerberos context", 746 error_message(kerror)); 747 exit(0); 748 } 749 #endif /* KERBEROS5 */ 750 751 init_curclass(); 752 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 753 curclass.type = CLASS_REAL; 754 755 /* If logins are disabled, print out the message. */ 756 if (display_file(_PATH_NOLOGIN, 530)) { 757 reply(530, "System not available."); 758 exit(0); 759 } 760 (void)display_file(conffilename(_NAME_FTPWELCOME), 220); 761 /* reply(220,) must follow */ 762 if (EMPTYSTR(version)) 763 reply(220, "%s FTP server ready.", hostname); 764 else 765 reply(220, "%s FTP server (%s) ready.", hostname, version); 766 767 if (xferlogname != NULL) { 768 xferlogfd = open(xferlogname, O_WRONLY | O_APPEND | O_CREAT, 769 0660); 770 if (xferlogfd == -1) 771 syslog(LOG_WARNING, "open xferlog `%s': %m", 772 xferlogname); 773 else 774 doxferlog |= 2; 775 } 776 777 ftp_loop(); 778 /* NOTREACHED */ 779 } 780 781 static void 782 lostconn(int signo __unused) 783 { 784 785 if (ftpd_debug) 786 syslog(LOG_DEBUG, "lost connection"); 787 dologout(1); 788 } 789 790 static void 791 toolong(int signo __unused) 792 { 793 794 /* XXXSIGRACE */ 795 reply(421, 796 "Timeout (" LLF " seconds): closing control connection.", 797 (LLT)curclass.timeout); 798 if (logging) 799 syslog(LOG_INFO, "User %s timed out after " LLF " seconds", 800 (pw ? pw->pw_name : "unknown"), (LLT)curclass.timeout); 801 dologout(1); 802 } 803 804 static void 805 sigquit(int signo) 806 { 807 808 if (ftpd_debug) 809 syslog(LOG_DEBUG, "got signal %d", signo); 810 dologout(1); 811 } 812 813 static void 814 sigurg(int signo __unused) 815 { 816 817 urgflag = 1; 818 } 819 820 821 /* 822 * Save the result of a getpwnam. Used for USER command, since 823 * the data returned must not be clobbered by any other command 824 * (e.g., globbing). 825 */ 826 static struct passwd * 827 sgetpwnam(const char *name) 828 { 829 static struct passwd save; 830 struct passwd *p; 831 832 if ((p = getpwnam(name)) == NULL) 833 return (p); 834 if (save.pw_name) { 835 free((char *)save.pw_name); 836 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 837 free((char *)save.pw_passwd); 838 free((char *)save.pw_gecos); 839 free((char *)save.pw_dir); 840 free((char *)save.pw_shell); 841 } 842 save = *p; 843 save.pw_name = ftpd_strdup(p->pw_name); 844 save.pw_passwd = ftpd_strdup(p->pw_passwd); 845 save.pw_gecos = ftpd_strdup(p->pw_gecos); 846 save.pw_dir = ftpd_strdup(p->pw_dir); 847 save.pw_shell = ftpd_strdup(p->pw_shell); 848 return (&save); 849 } 850 851 static int login_attempts; /* number of failed login attempts */ 852 static int askpasswd; /* had USER command, ask for PASSwd */ 853 static int permitted; /* USER permitted */ 854 855 /* 856 * USER command. 857 * Sets global passwd pointer pw if named account exists and is acceptable; 858 * sets askpasswd if a PASS command is expected. If logged in previously, 859 * need to reset state. If name is "ftp" or "anonymous", the name is not in 860 * _NAME_FTPUSERS, and ftp account exists, set guest and pw, then just return. 861 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 862 * requesting login privileges. Disallow anyone who does not have a standard 863 * shell as returned by getusershell(). Disallow anyone mentioned in the file 864 * _NAME_FTPUSERS to allow people such as root and uucp to be avoided. 865 */ 866 void 867 user(const char *name) 868 { 869 char *class; 870 #ifdef LOGIN_CAP 871 login_cap_t *lc = NULL; 872 #endif 873 #ifdef USE_PAM 874 int e; 875 #endif 876 877 class = NULL; 878 if (logged_in) { 879 switch (curclass.type) { 880 case CLASS_GUEST: 881 reply(530, "Can't change user from guest login."); 882 return; 883 case CLASS_CHROOT: 884 reply(530, "Can't change user from chroot user."); 885 return; 886 case CLASS_REAL: 887 if (dropprivs) { 888 reply(530, "Can't change user."); 889 return; 890 } 891 end_login(); 892 break; 893 default: 894 abort(); 895 } 896 } 897 898 #if defined(KERBEROS) 899 kdestroy(); 900 #endif 901 #if defined(KERBEROS5) 902 k5destroy(); 903 #endif 904 905 curclass.type = CLASS_REAL; 906 askpasswd = 0; 907 permitted = 0; 908 909 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 910 /* need `pw' setup for checkaccess() and checkuser () */ 911 if ((pw = sgetpwnam("ftp")) == NULL) 912 reply(530, "User %s unknown.", name); 913 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 914 reply(530, "User %s access denied.", name); 915 else { 916 curclass.type = CLASS_GUEST; 917 askpasswd = 1; 918 reply(331, 919 "Guest login ok, type your name as password."); 920 } 921 if (!askpasswd) { 922 if (logging) 923 syslog(LOG_NOTICE, 924 "ANONYMOUS FTP LOGIN REFUSED FROM %s", 925 remoteloghost); 926 end_login(); 927 goto cleanup_user; 928 } 929 name = "ftp"; 930 } else 931 pw = sgetpwnam(name); 932 933 strlcpy(curname, name, curname_len); 934 935 /* check user in /etc/ftpusers, and setup class */ 936 permitted = checkuser(_NAME_FTPUSERS, curname, 1, 0, &class); 937 938 /* check user in /etc/ftpchroot */ 939 #ifdef LOGIN_CAP 940 lc = login_getpwclass(pw); 941 #endif 942 if (checkuser(_NAME_FTPCHROOT, curname, 0, 0, NULL) 943 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 944 || login_getcapbool(lc, "ftp-chroot", 0) 945 #endif 946 ) { 947 if (curclass.type == CLASS_GUEST) { 948 syslog(LOG_NOTICE, 949 "Can't change guest user to chroot class; remove entry in %s", 950 _NAME_FTPCHROOT); 951 exit(1); 952 } 953 curclass.type = CLASS_CHROOT; 954 } 955 956 /* determine default class */ 957 if (class == NULL) { 958 switch (curclass.type) { 959 case CLASS_GUEST: 960 class = ftpd_strdup("guest"); 961 break; 962 case CLASS_CHROOT: 963 class = ftpd_strdup("chroot"); 964 break; 965 case CLASS_REAL: 966 class = ftpd_strdup("real"); 967 break; 968 default: 969 syslog(LOG_ERR, "unknown curclass.type %d; aborting", 970 curclass.type); 971 abort(); 972 } 973 } 974 /* parse ftpd.conf, setting up various parameters */ 975 parse_conf(class); 976 /* if not guest user, check for valid shell */ 977 if (pw == NULL) 978 permitted = 0; 979 else { 980 const char *cp, *shell; 981 982 if ((shell = pw->pw_shell) == NULL || *shell == 0) 983 shell = _PATH_BSHELL; 984 while ((cp = getusershell()) != NULL) 985 if (strcmp(cp, shell) == 0) 986 break; 987 endusershell(); 988 if (cp == NULL && curclass.type != CLASS_GUEST) 989 permitted = 0; 990 } 991 992 /* deny quickly (after USER not PASS) if requested */ 993 if (CURCLASS_FLAGS_ISSET(denyquick) && !permitted) { 994 reply(530, "User %s may not use FTP.", curname); 995 if (logging) 996 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 997 remoteloghost, curname); 998 end_login(); 999 goto cleanup_user; 1000 } 1001 1002 /* if haven't asked yet (i.e, not anon), ask now */ 1003 if (!askpasswd) { 1004 askpasswd = 1; 1005 #ifdef USE_PAM 1006 e = auth_pam(); /* this does reply(331, ...) */ 1007 do_pass(1, e, ""); 1008 goto cleanup_user; 1009 #else /* !USE_PAM */ 1010 #ifdef SKEY 1011 if (skey_haskey(curname) == 0) { 1012 const char *myskey; 1013 1014 myskey = skey_keyinfo(curname); 1015 reply(331, "Password [ %s ] required for %s.", 1016 myskey ? myskey : "error getting challenge", 1017 curname); 1018 } else 1019 #endif 1020 reply(331, "Password required for %s.", curname); 1021 #endif /* !USE_PAM */ 1022 } 1023 1024 cleanup_user: 1025 #ifdef LOGIN_CAP 1026 login_close(lc); 1027 #endif 1028 /* 1029 * Delay before reading passwd after first failed 1030 * attempt to slow down passwd-guessing programs. 1031 */ 1032 if (login_attempts) 1033 sleep((unsigned) login_attempts); 1034 1035 if (class) 1036 free(class); 1037 } 1038 1039 /* 1040 * Determine whether something is to happen (allow access, chroot) 1041 * for a user. Each line is a shell-style glob followed by 1042 * `yes' or `no'. 1043 * 1044 * For backward compatibility, `allow' and `deny' are synonymns 1045 * for `yes' and `no', respectively. 1046 * 1047 * Each glob is matched against the username in turn, and the first 1048 * match found is used. If no match is found, the result is the 1049 * argument `def'. If a match is found but without and explicit 1050 * `yes'/`no', the result is the opposite of def. 1051 * 1052 * If the file doesn't exist at all, the result is the argument 1053 * `nofile' 1054 * 1055 * Any line starting with `#' is considered a comment and ignored. 1056 * 1057 * Returns 0 if the user is denied, or 1 if they are allowed. 1058 * 1059 * NOTE: needs struct passwd *pw setup before use. 1060 */ 1061 static int 1062 checkuser(const char *fname, const char *name, int def, int nofile, 1063 char **retclass) 1064 { 1065 FILE *fd; 1066 int retval; 1067 char *word, *perm, *class, *buf, *p; 1068 size_t len, line; 1069 1070 retval = def; 1071 if (retclass != NULL) 1072 *retclass = NULL; 1073 if ((fd = fopen(conffilename(fname), "r")) == NULL) 1074 return nofile; 1075 1076 line = 0; 1077 for (; 1078 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 1079 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 1080 free(buf), buf = NULL) { 1081 word = perm = class = NULL; 1082 p = buf; 1083 if (len < 1) 1084 continue; 1085 if (p[len - 1] == '\n') 1086 p[--len] = '\0'; 1087 if (EMPTYSTR(p)) 1088 continue; 1089 1090 NEXTWORD(p, word); 1091 NEXTWORD(p, perm); 1092 NEXTWORD(p, class); 1093 if (EMPTYSTR(word)) 1094 continue; 1095 if (!EMPTYSTR(class)) { 1096 if (strcasecmp(class, "all") == 0 || 1097 strcasecmp(class, "none") == 0) { 1098 syslog(LOG_WARNING, 1099 "%s line %d: illegal user-defined class `%s' - skipping entry", 1100 fname, (int)line, class); 1101 continue; 1102 } 1103 } 1104 1105 /* have a host specifier */ 1106 if ((p = strchr(word, '@')) != NULL) { 1107 unsigned char net[16], mask[16], *addr; 1108 int addrlen, bits, bytes, a; 1109 1110 *p++ = '\0'; 1111 /* check against network or CIDR */ 1112 memset(net, 0x00, sizeof(net)); 1113 if ((bits = inet_net_pton(his_addr.su_family, p, net, 1114 sizeof(net))) != -1) { 1115 #ifdef INET6 1116 if (his_addr.su_family == AF_INET) { 1117 #endif 1118 addrlen = 4; 1119 addr = (unsigned char *)&his_addr.su_addr; 1120 #ifdef INET6 1121 } else { 1122 addrlen = 16; 1123 addr = (unsigned char *)&his_addr.su_6addr; 1124 } 1125 #endif 1126 bytes = bits / 8; 1127 bits = bits % 8; 1128 if (bytes > 0) 1129 memset(mask, 0xFF, bytes); 1130 if (bytes < addrlen) 1131 mask[bytes] = 0xFF << (8 - bits); 1132 if (bytes + 1 < addrlen) 1133 memset(mask + bytes + 1, 0x00, 1134 addrlen - bytes - 1); 1135 for (a = 0; a < addrlen; a++) 1136 if ((addr[a] & mask[a]) != net[a]) 1137 break; 1138 if (a < addrlen) 1139 continue; 1140 1141 /* check against hostname glob */ 1142 } else if (fnmatch(p, remotehost, FNM_CASEFOLD) != 0) 1143 continue; 1144 } 1145 1146 /* have a group specifier */ 1147 if ((p = strchr(word, ':')) != NULL) { 1148 gid_t *groups, *ng; 1149 int gsize, i, found; 1150 1151 if (pw == NULL) 1152 continue; /* no match for unknown user */ 1153 *p++ = '\0'; 1154 groups = NULL; 1155 gsize = 16; 1156 do { 1157 ng = realloc(groups, gsize * sizeof(gid_t)); 1158 if (ng == NULL) 1159 fatal( 1160 "Local resource failure: realloc"); 1161 groups = ng; 1162 } while (getgrouplist(pw->pw_name, pw->pw_gid, 1163 groups, &gsize) == -1); 1164 found = 0; 1165 for (i = 0; i < gsize; i++) { 1166 struct group *g; 1167 1168 if ((g = getgrgid(groups[i])) == NULL) 1169 continue; 1170 if (fnmatch(p, g->gr_name, 0) == 0) { 1171 found = 1; 1172 break; 1173 } 1174 } 1175 free(groups); 1176 if (!found) 1177 continue; 1178 } 1179 1180 /* check against username glob */ 1181 if (fnmatch(word, name, 0) != 0) 1182 continue; 1183 1184 if (perm != NULL && 1185 ((strcasecmp(perm, "allow") == 0) || 1186 (strcasecmp(perm, "yes") == 0))) 1187 retval = 1; 1188 else if (perm != NULL && 1189 ((strcasecmp(perm, "deny") == 0) || 1190 (strcasecmp(perm, "no") == 0))) 1191 retval = 0; 1192 else 1193 retval = !def; 1194 if (!EMPTYSTR(class) && retclass != NULL) 1195 *retclass = ftpd_strdup(class); 1196 free(buf); 1197 break; 1198 } 1199 (void) fclose(fd); 1200 return (retval); 1201 } 1202 1203 /* 1204 * Check if user is allowed by /etc/ftpusers 1205 * returns 1 for yes, 0 for no 1206 * 1207 * NOTE: needs struct passwd *pw setup (for checkuser()) 1208 */ 1209 static int 1210 checkaccess(const char *name) 1211 { 1212 1213 return (checkuser(_NAME_FTPUSERS, name, 1, 0, NULL)); 1214 } 1215 1216 static void 1217 login_utmp(const char *line, const char *name, const char *host, 1218 struct sockinet *haddr) 1219 { 1220 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 1221 struct timeval tv; 1222 (void)gettimeofday(&tv, NULL); 1223 #endif 1224 #ifdef SUPPORT_UTMPX 1225 if (doutmp) { 1226 (void)memset(&utmpx, 0, sizeof(utmpx)); 1227 utmpx.ut_tv = tv; 1228 utmpx.ut_pid = getpid(); 1229 utmpx.ut_id[0] = 'f'; 1230 utmpx.ut_id[1] = 't'; 1231 utmpx.ut_id[2] = 'p'; 1232 utmpx.ut_id[3] = '*'; 1233 utmpx.ut_type = USER_PROCESS; 1234 (void)strncpy(utmpx.ut_name, name, sizeof(utmpx.ut_name)); 1235 (void)strncpy(utmpx.ut_line, line, sizeof(utmpx.ut_line)); 1236 (void)strncpy(utmpx.ut_host, host, sizeof(utmpx.ut_host)); 1237 (void)memcpy(&utmpx.ut_ss, &haddr->si_su, haddr->su_len); 1238 ftpd_loginx(&utmpx); 1239 } 1240 if (dowtmp) 1241 ftpd_logwtmpx(line, name, host, haddr, 0, USER_PROCESS); 1242 #endif 1243 #ifdef SUPPORT_UTMP 1244 if (doutmp) { 1245 (void)memset(&utmp, 0, sizeof(utmp)); 1246 (void)time(&utmp.ut_time); 1247 (void)strncpy(utmp.ut_name, name, sizeof(utmp.ut_name)); 1248 (void)strncpy(utmp.ut_line, line, sizeof(utmp.ut_line)); 1249 (void)strncpy(utmp.ut_host, host, sizeof(utmp.ut_host)); 1250 ftpd_login(&utmp); 1251 } 1252 if (dowtmp) 1253 ftpd_logwtmp(line, name, host); 1254 #endif 1255 } 1256 1257 static void 1258 logout_utmp(void) 1259 { 1260 #ifdef SUPPORT_UTMPX 1261 int okwtmpx = dowtmp; 1262 #endif 1263 #ifdef SUPPORT_UTMP 1264 int okwtmp = dowtmp; 1265 #endif 1266 if (logged_in) { 1267 #ifdef SUPPORT_UTMPX 1268 if (doutmp) 1269 okwtmpx &= ftpd_logoutx(ttyline, 0, DEAD_PROCESS); 1270 if (okwtmpx) 1271 ftpd_logwtmpx(ttyline, "", "", NULL, 0, DEAD_PROCESS); 1272 #endif 1273 #ifdef SUPPORT_UTMP 1274 if (doutmp) 1275 okwtmp &= ftpd_logout(ttyline); 1276 if (okwtmp) 1277 ftpd_logwtmp(ttyline, "", ""); 1278 #endif 1279 } 1280 } 1281 1282 /* 1283 * Terminate login as previous user (if any), resetting state; 1284 * used when USER command is given or login fails. 1285 */ 1286 static void 1287 end_login(void) 1288 { 1289 #ifdef USE_PAM 1290 int e; 1291 #endif 1292 logout_utmp(); 1293 show_chdir_messages(-1); /* flush chdir cache */ 1294 if (pw != NULL && pw->pw_passwd != NULL) 1295 memset(pw->pw_passwd, 0, strlen(pw->pw_passwd)); 1296 pw = NULL; 1297 logged_in = 0; 1298 askpasswd = 0; 1299 permitted = 0; 1300 quietmessages = 0; 1301 gidcount = 0; 1302 curclass.type = CLASS_REAL; 1303 (void) seteuid((uid_t)0); 1304 #ifdef LOGIN_CAP 1305 setusercontext(NULL, getpwuid(0), 0, 1306 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1307 #endif 1308 #ifdef USE_PAM 1309 if (pamh) { 1310 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1311 syslog(LOG_ERR, "pam_setcred: %s", 1312 pam_strerror(pamh, e)); 1313 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1314 syslog(LOG_ERR, "pam_close_session: %s", 1315 pam_strerror(pamh, e)); 1316 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1317 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1318 pamh = NULL; 1319 } 1320 #endif 1321 } 1322 1323 void 1324 pass(const char *passwd) 1325 { 1326 do_pass(0, 0, passwd); 1327 } 1328 1329 /* 1330 * Perform the passwd confirmation and login. 1331 * 1332 * If pass_checked is zero, confirm passwd is correct, & ignore pass_rval. 1333 * This is the traditional PASS implementation. 1334 * 1335 * If pass_checked is non-zero, use pass_rval and ignore passwd. 1336 * This is used by auth_pam() which has already parsed PASS. 1337 * This only applies to curclass.type != CLASS_GUEST. 1338 */ 1339 static void 1340 do_pass(int pass_checked, int pass_rval, const char *passwd) 1341 { 1342 int rval; 1343 char root[MAXPATHLEN]; 1344 #ifdef LOGIN_CAP 1345 login_cap_t *lc = NULL; 1346 #endif 1347 #ifdef USE_PAM 1348 int e; 1349 #endif 1350 1351 rval = 1; 1352 1353 if (logged_in || askpasswd == 0) { 1354 reply(503, "Login with USER first."); 1355 return; 1356 } 1357 askpasswd = 0; 1358 if (curclass.type != CLASS_GUEST) { 1359 /* "ftp" is the only account allowed with no password */ 1360 if (pw == NULL) { 1361 rval = 1; /* failure below */ 1362 goto skip; 1363 } 1364 if (pass_checked) { /* password validated in user() */ 1365 rval = pass_rval; 1366 goto skip; 1367 } 1368 #ifdef USE_PAM 1369 syslog(LOG_ERR, "do_pass: USE_PAM shouldn't get here"); 1370 rval = 1; 1371 goto skip; 1372 #endif 1373 #if defined(KERBEROS) 1374 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 1375 rval = 0; 1376 goto skip; 1377 } 1378 #endif 1379 #if defined(KERBEROS5) 1380 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 1381 rval = 0; 1382 goto skip; 1383 } 1384 #endif 1385 #ifdef SKEY 1386 if (skey_haskey(pw->pw_name) == 0) { 1387 char *p; 1388 int r; 1389 1390 p = ftpd_strdup(passwd); 1391 r = skey_passcheck(pw->pw_name, p); 1392 free(p); 1393 if (r != -1) { 1394 rval = 0; 1395 goto skip; 1396 } 1397 } 1398 #endif 1399 if (!sflag) 1400 rval = checkpassword(pw, passwd); 1401 else 1402 rval = 1; 1403 1404 skip: 1405 1406 /* 1407 * If rval > 0, the user failed the authentication check 1408 * above. If rval == 0, either Kerberos or local 1409 * authentication succeeded. 1410 */ 1411 if (rval) { 1412 reply(530, "%s", rval == 2 ? "Password expired." : 1413 "Login incorrect."); 1414 pfilter_notify(1, rval == 2 ? "exppass" : "badpass"); 1415 if (logging) { 1416 syslog(LOG_NOTICE, 1417 "FTP LOGIN FAILED FROM %s", remoteloghost); 1418 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1419 "FTP LOGIN FAILED FROM %s, %s", 1420 remoteloghost, curname); 1421 } 1422 pw = NULL; 1423 if (login_attempts++ >= 5) { 1424 syslog(LOG_NOTICE, 1425 "repeated login failures from %s", 1426 remoteloghost); 1427 exit(0); 1428 } 1429 return; 1430 } 1431 } 1432 1433 /* password ok; check if anything else prevents login */ 1434 if (! permitted) { 1435 reply(530, "User %s may not use FTP.", pw->pw_name); 1436 if (logging) 1437 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 1438 remoteloghost, pw->pw_name); 1439 goto bad; 1440 } 1441 1442 login_attempts = 0; /* this time successful */ 1443 if (setegid((gid_t)pw->pw_gid) < 0) { 1444 reply(550, "Can't set gid."); 1445 goto bad; 1446 } 1447 #ifdef LOGIN_CAP 1448 if ((lc = login_getpwclass(pw)) != NULL) { 1449 #ifdef notyet 1450 char remote_ip[NI_MAXHOST]; 1451 1452 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1453 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1454 NI_NUMERICHOST)) 1455 *remote_ip = 0; 1456 remote_ip[sizeof(remote_ip) - 1] = 0; 1457 if (!auth_hostok(lc, remotehost, remote_ip)) { 1458 pfilter_notify(1, "bannedhost"); 1459 syslog(LOG_INFO|LOG_AUTH, 1460 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1461 pw->pw_name); 1462 reply(530, "Permission denied."); 1463 pw = NULL; 1464 return; 1465 } 1466 if (!auth_timeok(lc, time(NULL))) { 1467 reply(530, "Login not available right now."); 1468 pw = NULL; 1469 return; 1470 } 1471 #endif 1472 } 1473 setsid(); 1474 setusercontext(lc, pw, 0, 1475 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1476 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1477 #else 1478 (void) initgroups(pw->pw_name, pw->pw_gid); 1479 /* cache groups for cmds.c::matchgroup() */ 1480 #endif 1481 #ifdef USE_PAM 1482 if (pamh) { 1483 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1484 syslog(LOG_ERR, "pam_open_session: %s", 1485 pam_strerror(pamh, e)); 1486 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) 1487 != PAM_SUCCESS) { 1488 syslog(LOG_ERR, "pam_setcred: %s", 1489 pam_strerror(pamh, e)); 1490 } 1491 } 1492 #endif 1493 gidcount = getgroups(0, NULL); 1494 if (gidlist) 1495 free(gidlist); 1496 gidlist = malloc(gidcount * sizeof *gidlist); 1497 gidcount = getgroups(gidcount, gidlist); 1498 1499 /* open utmp/wtmp before chroot */ 1500 login_utmp(ttyline, pw->pw_name, remotehost, &his_addr); 1501 1502 logged_in = 1; 1503 1504 connections = 1; 1505 if (dopidfile) 1506 count_users(); 1507 if (curclass.limit != -1 && connections > curclass.limit) { 1508 if (! EMPTYSTR(curclass.limitfile)) 1509 (void)display_file(conffilename(curclass.limitfile), 1510 530); 1511 reply(530, 1512 "User %s access denied, connection limit of " LLF 1513 " reached.", 1514 pw->pw_name, (LLT)curclass.limit); 1515 syslog(LOG_NOTICE, 1516 "Maximum connection limit of " LLF 1517 " for class %s reached, login refused for %s", 1518 (LLT)curclass.limit, curclass.classname, pw->pw_name); 1519 goto bad; 1520 } 1521 1522 homedir[0] = '/'; 1523 switch (curclass.type) { 1524 case CLASS_GUEST: 1525 /* 1526 * We MUST do a chdir() after the chroot. Otherwise 1527 * the old current directory will be accessible as "." 1528 * outside the new root! 1529 */ 1530 format_path(root, 1531 curclass.chroot ? curclass.chroot : 1532 anondir ? anondir : 1533 pw->pw_dir); 1534 format_path(homedir, 1535 curclass.homedir ? curclass.homedir : 1536 "/"); 1537 if (EMPTYSTR(homedir)) 1538 homedir[0] = '/'; 1539 if (EMPTYSTR(root) || chroot(root) < 0) { 1540 syslog(LOG_NOTICE, 1541 "GUEST user %s: can't chroot to %s: %m", 1542 pw->pw_name, root); 1543 goto bad_guest; 1544 } 1545 if (chdir(homedir) < 0) { 1546 syslog(LOG_NOTICE, 1547 "GUEST user %s: can't chdir to %s: %m", 1548 pw->pw_name, homedir); 1549 bad_guest: 1550 reply(550, "Can't set guest privileges."); 1551 goto bad; 1552 } 1553 break; 1554 case CLASS_CHROOT: 1555 format_path(root, 1556 curclass.chroot ? curclass.chroot : 1557 pw->pw_dir); 1558 format_path(homedir, 1559 curclass.homedir ? curclass.homedir : 1560 "/"); 1561 if (EMPTYSTR(homedir)) 1562 homedir[0] = '/'; 1563 if (EMPTYSTR(root) || chroot(root) < 0) { 1564 syslog(LOG_NOTICE, 1565 "CHROOT user %s: can't chroot to %s: %m", 1566 pw->pw_name, root); 1567 goto bad_chroot; 1568 } 1569 if (chdir(homedir) < 0) { 1570 syslog(LOG_NOTICE, 1571 "CHROOT user %s: can't chdir to %s: %m", 1572 pw->pw_name, homedir); 1573 bad_chroot: 1574 reply(550, "Can't change root."); 1575 goto bad; 1576 } 1577 break; 1578 case CLASS_REAL: 1579 /* only chroot REAL if explicitly requested */ 1580 if (! EMPTYSTR(curclass.chroot)) { 1581 format_path(root, curclass.chroot); 1582 if (EMPTYSTR(root) || chroot(root) < 0) { 1583 syslog(LOG_NOTICE, 1584 "REAL user %s: can't chroot to %s: %m", 1585 pw->pw_name, root); 1586 goto bad_chroot; 1587 } 1588 } 1589 format_path(homedir, 1590 curclass.homedir ? curclass.homedir : 1591 pw->pw_dir); 1592 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1593 if (chdir("/") < 0) { 1594 syslog(LOG_NOTICE, 1595 "REAL user %s: can't chdir to %s: %m", 1596 pw->pw_name, 1597 !EMPTYSTR(homedir) ? homedir : "/"); 1598 reply(530, 1599 "User %s: can't change directory to %s.", 1600 pw->pw_name, 1601 !EMPTYSTR(homedir) ? homedir : "/"); 1602 goto bad; 1603 } else { 1604 reply(-230, 1605 "No directory! Logging in with home=/"); 1606 homedir[0] = '/'; 1607 } 1608 } 1609 break; 1610 } 1611 #ifndef LOGIN_CAP 1612 setsid(); 1613 setlogin(pw->pw_name); 1614 #endif 1615 if (dropprivs || 1616 (curclass.type != CLASS_REAL && 1617 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1618 dropprivs++; 1619 if (setgid((gid_t)pw->pw_gid) < 0) { 1620 reply(550, "Can't set gid."); 1621 goto bad; 1622 } 1623 if (setuid((uid_t)pw->pw_uid) < 0) { 1624 reply(550, "Can't set uid."); 1625 goto bad; 1626 } 1627 } else { 1628 if (seteuid((uid_t)pw->pw_uid) < 0) { 1629 reply(550, "Can't set uid."); 1630 goto bad; 1631 } 1632 } 1633 setenv("HOME", homedir, 1); 1634 1635 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1636 quietmessages = 1; 1637 1638 /* 1639 * Display a login message, if it exists. 1640 * N.B. reply(230,) must follow the message. 1641 */ 1642 if (! EMPTYSTR(curclass.motd)) 1643 (void)display_file(conffilename(curclass.motd), 230); 1644 show_chdir_messages(230); 1645 if (curclass.type == CLASS_GUEST) { 1646 char *p; 1647 1648 reply(230, "Guest login ok, access restrictions apply."); 1649 #if defined(HAVE_SETPROCTITLE) 1650 snprintf(proctitle, sizeof(proctitle), 1651 "%s: anonymous/%s", remotehost, passwd); 1652 setproctitle("%s", proctitle); 1653 #endif /* defined(HAVE_SETPROCTITLE) */ 1654 if (logging) 1655 syslog(LOG_INFO, 1656 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1657 remoteloghost, passwd, 1658 curclass.classname, CURCLASSTYPE); 1659 /* store guest password reply into pw_passwd */ 1660 REASSIGN(pw->pw_passwd, ftpd_strdup(passwd)); 1661 for (p = pw->pw_passwd; *p; p++) 1662 if (!isgraph((unsigned char)*p)) 1663 *p = '_'; 1664 } else { 1665 reply(230, "User %s logged in.", pw->pw_name); 1666 #if defined(HAVE_SETPROCTITLE) 1667 snprintf(proctitle, sizeof(proctitle), 1668 "%s: %s", remotehost, pw->pw_name); 1669 setproctitle("%s", proctitle); 1670 #endif /* defined(HAVE_SETPROCTITLE) */ 1671 if (logging) 1672 syslog(LOG_INFO, 1673 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1674 remoteloghost, pw->pw_name, 1675 curclass.classname, CURCLASSTYPE); 1676 } 1677 (void) umask(curclass.umask); 1678 #ifdef LOGIN_CAP 1679 login_close(lc); 1680 #endif 1681 return; 1682 1683 bad: 1684 #ifdef LOGIN_CAP 1685 login_close(lc); 1686 #endif 1687 /* Forget all about it... */ 1688 end_login(); 1689 } 1690 1691 void 1692 retrieve(const char *argv[], const char *name) 1693 { 1694 FILE *fin, *dout; 1695 struct stat st; 1696 int (*closefunc)(FILE *) = NULL; 1697 int dolog, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1698 struct timeval start, finish, td, *tdp; 1699 struct rusage rusage_before, rusage_after; 1700 const char *dispname; 1701 const char *error; 1702 1703 sendrv = closerv = stderrfd = -1; 1704 isconversion = isdata = isls = dolog = 0; 1705 tdp = NULL; 1706 dispname = name; 1707 fin = dout = NULL; 1708 error = NULL; 1709 if (argv == NULL) { /* if not running a command ... */ 1710 dolog = 1; 1711 isdata = 1; 1712 fin = fopen(name, "r"); 1713 closefunc = fclose; 1714 if (fin == NULL) /* doesn't exist?; try a conversion */ 1715 argv = do_conversion(name); 1716 if (argv != NULL) { 1717 isconversion++; 1718 syslog(LOG_DEBUG, "get command: '%s' on '%s'", 1719 argv[0], name); 1720 } 1721 } 1722 if (argv != NULL) { 1723 char temp[MAXPATHLEN]; 1724 1725 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1726 isls = 1; 1727 stderrfd = -1; 1728 } else { 1729 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1730 stderrfd = mkstemp(temp); 1731 if (stderrfd != -1) 1732 (void)unlink(temp); 1733 } 1734 dispname = argv[0]; 1735 fin = ftpd_popen(argv, "r", stderrfd); 1736 closefunc = ftpd_pclose; 1737 st.st_size = -1; 1738 st.st_blksize = BUFSIZ; 1739 } 1740 if (fin == NULL) { 1741 if (errno != 0) { 1742 perror_reply(550, dispname); 1743 if (dolog) 1744 logxfer("get", -1, name, NULL, NULL, 1745 strerror(errno)); 1746 } 1747 goto cleanupretrieve; 1748 } 1749 byte_count = -1; 1750 if (argv == NULL 1751 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1752 error = "Not a plain file"; 1753 reply(550, "%s: %s.", dispname, error); 1754 goto done; 1755 } 1756 if (restart_point) { 1757 if (type == TYPE_A) { 1758 off_t i; 1759 int c; 1760 1761 for (i = 0; i < restart_point; i++) { 1762 if ((c=getc(fin)) == EOF) { 1763 error = strerror(errno); 1764 perror_reply(550, dispname); 1765 goto done; 1766 } 1767 if (c == '\n') 1768 i++; 1769 } 1770 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1771 error = strerror(errno); 1772 perror_reply(550, dispname); 1773 goto done; 1774 } 1775 } 1776 dout = dataconn(dispname, st.st_size, "w"); 1777 if (dout == NULL) 1778 goto done; 1779 1780 (void)getrusage(RUSAGE_SELF, &rusage_before); 1781 (void)gettimeofday(&start, NULL); 1782 sendrv = send_data(fin, dout, &st, isdata); 1783 (void)gettimeofday(&finish, NULL); 1784 (void)getrusage(RUSAGE_SELF, &rusage_after); 1785 closedataconn(dout); /* close now to affect timing stats */ 1786 timersub(&finish, &start, &td); 1787 tdp = &td; 1788 done: 1789 if (dolog) { 1790 logxfer("get", byte_count, name, NULL, tdp, error); 1791 if (tdp != NULL) 1792 logrusage(&rusage_before, &rusage_after); 1793 } 1794 closerv = (*closefunc)(fin); 1795 if (sendrv == 0) { 1796 FILE *errf; 1797 struct stat sb; 1798 1799 if (!isls && argv != NULL && closerv != 0) { 1800 reply(-226, 1801 "Command returned an exit status of %d", 1802 closerv); 1803 if (isconversion) 1804 syslog(LOG_WARNING, 1805 "retrieve command: '%s' returned %d", 1806 argv[0], closerv); 1807 } 1808 if (!isls && argv != NULL && stderrfd != -1 && 1809 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1810 ((errf = fdopen(stderrfd, "r")) != NULL)) { 1811 char *cp, line[LINE_MAX]; 1812 1813 reply(-226, "Command error messages:"); 1814 rewind(errf); 1815 while (fgets(line, sizeof(line), errf) != NULL) { 1816 if ((cp = strchr(line, '\n')) != NULL) 1817 *cp = '\0'; 1818 reply(0, " %s", line); 1819 } 1820 (void) fflush(stdout); 1821 (void) fclose(errf); 1822 /* a reply(226,) must follow */ 1823 } 1824 reply(226, "Transfer complete."); 1825 } 1826 cleanupretrieve: 1827 if (stderrfd != -1) 1828 (void)close(stderrfd); 1829 if (isconversion) 1830 free(argv); 1831 } 1832 1833 void 1834 store(const char *name, const char *fmode, int unique) 1835 { 1836 FILE *fout, *din; 1837 struct stat st; 1838 int (*closefunc)(FILE *); 1839 struct timeval start, finish, td, *tdp; 1840 const char *desc, *error; 1841 1842 din = NULL; 1843 desc = (*fmode == 'w') ? "put" : "append"; 1844 error = NULL; 1845 if (unique && stat(name, &st) == 0 && 1846 (name = gunique(name)) == NULL) { 1847 logxfer(desc, -1, name, NULL, NULL, 1848 "cannot create unique file"); 1849 goto cleanupstore; 1850 } 1851 1852 if (restart_point) 1853 fmode = "r+"; 1854 fout = fopen(name, fmode); 1855 closefunc = fclose; 1856 tdp = NULL; 1857 if (fout == NULL) { 1858 perror_reply(553, name); 1859 logxfer(desc, -1, name, NULL, NULL, strerror(errno)); 1860 goto cleanupstore; 1861 } 1862 byte_count = -1; 1863 if (restart_point) { 1864 if (type == TYPE_A) { 1865 off_t i; 1866 int c; 1867 1868 for (i = 0; i < restart_point; i++) { 1869 if ((c=getc(fout)) == EOF) { 1870 error = strerror(errno); 1871 perror_reply(550, name); 1872 goto done; 1873 } 1874 if (c == '\n') 1875 i++; 1876 } 1877 /* 1878 * We must do this seek to "current" position 1879 * because we are changing from reading to 1880 * writing. 1881 */ 1882 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1883 error = strerror(errno); 1884 perror_reply(550, name); 1885 goto done; 1886 } 1887 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1888 error = strerror(errno); 1889 perror_reply(550, name); 1890 goto done; 1891 } 1892 } 1893 din = dataconn(name, (off_t)-1, "r"); 1894 if (din == NULL) 1895 goto done; 1896 (void)gettimeofday(&start, NULL); 1897 if (receive_data(din, fout) == 0) { 1898 if (unique) 1899 reply(226, "Transfer complete (unique file name:%s).", 1900 name); 1901 else 1902 reply(226, "Transfer complete."); 1903 } 1904 (void)gettimeofday(&finish, NULL); 1905 closedataconn(din); /* close now to affect timing stats */ 1906 timersub(&finish, &start, &td); 1907 tdp = &td; 1908 done: 1909 logxfer(desc, byte_count, name, NULL, tdp, error); 1910 (*closefunc)(fout); 1911 cleanupstore: 1912 ; 1913 } 1914 1915 static FILE * 1916 getdatasock(const char *fmode) 1917 { 1918 int on, s, t, tries; 1919 in_port_t port; 1920 1921 on = 1; 1922 if (data >= 0) 1923 return (fdopen(data, fmode)); 1924 if (! dropprivs) 1925 (void) seteuid((uid_t)0); 1926 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1927 if (s < 0) 1928 goto bad; 1929 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1930 (char *) &on, sizeof(on)) < 0) 1931 goto bad; 1932 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1933 (char *) &on, sizeof(on)) < 0) 1934 goto bad; 1935 /* anchor socket to avoid multi-homing problems */ 1936 data_source = ctrl_addr; 1937 /* 1938 * By default source port for PORT connctions is 1939 * ctrlport-1 (see RFC959 section 5.2). 1940 * However, if privs have been dropped and that 1941 * would be < IPPORT_RESERVED, use a random port 1942 * instead. 1943 */ 1944 if (dataport) 1945 port = dataport; 1946 else 1947 port = ntohs(ctrl_addr.su_port) - 1; 1948 if (dropprivs && port < IPPORT_RESERVED) 1949 port = 0; /* use random port */ 1950 data_source.su_port = htons(port); 1951 1952 for (tries = 1; ; tries++) { 1953 if (bind(s, (struct sockaddr *)&data_source.si_su, 1954 data_source.su_len) >= 0) 1955 break; 1956 if (errno != EADDRINUSE || tries > 10) 1957 goto bad; 1958 sleep(tries); 1959 } 1960 if (! dropprivs) 1961 (void) seteuid((uid_t)pw->pw_uid); 1962 #ifdef IP_TOS 1963 if (!mapped && ctrl_addr.su_family == AF_INET) { 1964 on = IPTOS_THROUGHPUT; 1965 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1966 sizeof(int)) < 0) 1967 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1968 } 1969 #endif 1970 return (fdopen(s, fmode)); 1971 bad: 1972 /* Return the real value of errno (close may change it) */ 1973 t = errno; 1974 if (! dropprivs) 1975 (void) seteuid((uid_t)pw->pw_uid); 1976 if (s >= 0) 1977 (void) close(s); 1978 errno = t; 1979 return (NULL); 1980 } 1981 1982 FILE * 1983 dataconn(const char *name, off_t size, const char *fmode) 1984 { 1985 char sizebuf[32]; 1986 FILE *file; 1987 int retry, tos, keepalive, conerrno; 1988 1989 file_size = size; 1990 byte_count = 0; 1991 if (size != (off_t) -1) 1992 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1993 (LLT)size, PLURAL(size)); 1994 else 1995 sizebuf[0] = '\0'; 1996 if (pdata >= 0) { 1997 struct sockinet from; 1998 int s; 1999 socklen_t fromlen = sizeof(from.su_len); 2000 2001 (void) alarm(curclass.timeout); 2002 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 2003 (void) alarm(0); 2004 if (s < 0) { 2005 reply(425, "Can't open data connection."); 2006 (void) close(pdata); 2007 pdata = -1; 2008 return (NULL); 2009 } 2010 (void) close(pdata); 2011 pdata = s; 2012 switch (from.su_family) { 2013 case AF_INET: 2014 #ifdef IP_TOS 2015 if (!mapped) { 2016 tos = IPTOS_THROUGHPUT; 2017 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 2018 (char *)&tos, sizeof(int)); 2019 } 2020 break; 2021 #endif 2022 } 2023 /* Set keepalives on the socket to detect dropped conns. */ 2024 #ifdef SO_KEEPALIVE 2025 keepalive = 1; 2026 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 2027 (char *)&keepalive, sizeof(int)); 2028 #endif 2029 reply(150, "Opening %s mode data connection for '%s'%s.", 2030 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2031 return (fdopen(pdata, fmode)); 2032 } 2033 if (data >= 0) { 2034 reply(125, "Using existing data connection for '%s'%s.", 2035 name, sizebuf); 2036 usedefault = 1; 2037 return (fdopen(data, fmode)); 2038 } 2039 if (usedefault) 2040 data_dest = his_addr; 2041 usedefault = 1; 2042 retry = conerrno = 0; 2043 do { 2044 file = getdatasock(fmode); 2045 if (file == NULL) { 2046 char hbuf[NI_MAXHOST]; 2047 char pbuf[NI_MAXSERV]; 2048 2049 if (getnameinfo((struct sockaddr *)&data_source.si_su, 2050 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 2051 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV)) 2052 strlcpy(hbuf, "?", sizeof(hbuf)); 2053 reply(425, "Can't create data socket (%s,%s): %s.", 2054 hbuf, pbuf, strerror(errno)); 2055 return (NULL); 2056 } 2057 data = fileno(file); 2058 conerrno = 0; 2059 if (connect(data, (struct sockaddr *)&data_dest.si_su, 2060 data_dest.su_len) == 0) 2061 break; 2062 conerrno = errno; 2063 (void) fclose(file); 2064 file = NULL; 2065 data = -1; 2066 if (conerrno == EADDRINUSE) { 2067 sleep((unsigned) swaitint); 2068 retry += swaitint; 2069 } else { 2070 break; 2071 } 2072 } while (retry <= swaitmax); 2073 if (conerrno != 0) { 2074 perror_reply(425, "Can't build data connection"); 2075 return (NULL); 2076 } 2077 reply(150, "Opening %s mode data connection for '%s'%s.", 2078 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2079 return (file); 2080 } 2081 2082 void 2083 closedataconn(FILE *fd) 2084 { 2085 2086 if (fd == NULL) 2087 return; 2088 (void)fclose(fd); 2089 data = -1; 2090 if (pdata >= 0) 2091 (void)close(pdata); 2092 pdata = -1; 2093 } 2094 2095 int 2096 write_data(int fd, char *buf, size_t size, off_t *bufrem, 2097 struct timeval *then, int isdata) 2098 { 2099 struct timeval now, td; 2100 ssize_t c; 2101 2102 while (size > 0) { 2103 c = size; 2104 if (curclass.writesize) { 2105 if (curclass.writesize < c) 2106 c = curclass.writesize; 2107 } 2108 if (curclass.rateget) { 2109 if (*bufrem < c) 2110 c = *bufrem; 2111 } 2112 (void) alarm(curclass.timeout); 2113 c = write(fd, buf, c); 2114 if (c <= 0) 2115 return (1); 2116 buf += c; 2117 size -= c; 2118 byte_count += c; 2119 if (isdata) { 2120 total_data_out += c; 2121 total_data += c; 2122 } 2123 total_bytes_out += c; 2124 total_bytes += c; 2125 if (curclass.rateget) { 2126 *bufrem -= c; 2127 if (*bufrem == 0) { 2128 (void)gettimeofday(&now, NULL); 2129 timersub(&now, then, &td); 2130 if (td.tv_sec == 0) { 2131 usleep(1000000 - td.tv_usec); 2132 (void)gettimeofday(then, NULL); 2133 } else 2134 *then = now; 2135 *bufrem = curclass.rateget; 2136 } 2137 } 2138 } 2139 return (0); 2140 } 2141 2142 static enum send_status 2143 send_data_with_read(int filefd, int netfd, const struct stat *st, int isdata) 2144 { 2145 struct timeval then; 2146 off_t bufrem; 2147 ssize_t readsize; 2148 char *buf; 2149 int c, error; 2150 2151 if (curclass.readsize > 0) 2152 readsize = curclass.readsize; 2153 else 2154 readsize = st->st_blksize; 2155 if ((buf = malloc(readsize)) == NULL) { 2156 perror_reply(451, "Local resource failure: malloc"); 2157 return (SS_NO_TRANSFER); 2158 } 2159 2160 if (curclass.rateget) { 2161 bufrem = curclass.rateget; 2162 (void)gettimeofday(&then, NULL); 2163 } else 2164 bufrem = readsize; 2165 for (;;) { 2166 (void) alarm(curclass.timeout); 2167 c = read(filefd, buf, readsize); 2168 if (c == 0) 2169 error = SS_SUCCESS; 2170 else if (c < 0) 2171 error = SS_FILE_ERROR; 2172 else if (write_data(netfd, buf, c, &bufrem, &then, isdata)) 2173 error = SS_DATA_ERROR; 2174 else if (urgflag && handleoobcmd()) 2175 error = SS_ABORTED; 2176 else 2177 continue; 2178 2179 free(buf); 2180 return (error); 2181 } 2182 } 2183 2184 static enum send_status 2185 send_data_with_mmap(int filefd, int netfd, const struct stat *st, int isdata) 2186 { 2187 struct timeval then; 2188 off_t bufrem, filesize, off, origoff; 2189 ssize_t mapsize, winsize; 2190 int error, sendbufsize, sendlowat; 2191 void *win; 2192 2193 bufrem = 0; 2194 if (curclass.sendbufsize) { 2195 sendbufsize = curclass.sendbufsize; 2196 if (setsockopt(netfd, SOL_SOCKET, SO_SNDBUF, 2197 &sendbufsize, sizeof(int)) == -1) 2198 syslog(LOG_WARNING, "setsockopt(SO_SNDBUF, %d): %m", 2199 sendbufsize); 2200 } 2201 2202 if (curclass.sendlowat) { 2203 sendlowat = curclass.sendlowat; 2204 if (setsockopt(netfd, SOL_SOCKET, SO_SNDLOWAT, 2205 &sendlowat, sizeof(int)) == -1) 2206 syslog(LOG_WARNING, "setsockopt(SO_SNDLOWAT, %d): %m", 2207 sendlowat); 2208 } 2209 2210 winsize = curclass.mmapsize; 2211 filesize = st->st_size; 2212 if (ftpd_debug) 2213 syslog(LOG_INFO, "mmapsize = " LLF ", writesize = " LLF, 2214 (LLT)winsize, (LLT)curclass.writesize); 2215 if (winsize <= 0) 2216 goto try_read; 2217 2218 off = lseek(filefd, (off_t)0, SEEK_CUR); 2219 if (off == -1) 2220 goto try_read; 2221 2222 origoff = off; 2223 if (curclass.rateget) { 2224 bufrem = curclass.rateget; 2225 (void)gettimeofday(&then, NULL); 2226 } else 2227 bufrem = winsize; 2228 while (1) { 2229 mapsize = MIN(filesize - off, winsize); 2230 if (mapsize == 0) 2231 break; 2232 win = mmap(NULL, mapsize, PROT_READ, 2233 MAP_FILE|MAP_SHARED, filefd, off); 2234 if (win == MAP_FAILED) { 2235 if (off == origoff) 2236 goto try_read; 2237 return (SS_FILE_ERROR); 2238 } 2239 (void) madvise(win, mapsize, MADV_SEQUENTIAL); 2240 error = write_data(netfd, win, mapsize, &bufrem, &then, 2241 isdata); 2242 (void) madvise(win, mapsize, MADV_DONTNEED); 2243 munmap(win, mapsize); 2244 if (urgflag && handleoobcmd()) 2245 return (SS_ABORTED); 2246 if (error) 2247 return (SS_DATA_ERROR); 2248 off += mapsize; 2249 } 2250 return (SS_SUCCESS); 2251 2252 try_read: 2253 return (send_data_with_read(filefd, netfd, st, isdata)); 2254 } 2255 2256 /* 2257 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2258 * encapsulation of the data subject to Mode, Structure, and Type. 2259 * 2260 * NB: Form isn't handled. 2261 */ 2262 static int 2263 send_data(FILE *instr, FILE *outstr, const struct stat *st, int isdata) 2264 { 2265 int c, filefd, netfd, rval; 2266 2267 urgflag = 0; 2268 transflag = 1; 2269 rval = -1; 2270 2271 switch (type) { 2272 2273 case TYPE_A: 2274 /* XXXLUKEM: rate limit ascii send (get) */ 2275 (void) alarm(curclass.timeout); 2276 while ((c = getc(instr)) != EOF) { 2277 if (urgflag && handleoobcmd()) 2278 goto cleanup_send_data; 2279 byte_count++; 2280 if (c == '\n') { 2281 if (ferror(outstr)) 2282 goto data_err; 2283 (void) putc('\r', outstr); 2284 if (isdata) { 2285 total_data_out++; 2286 total_data++; 2287 } 2288 total_bytes_out++; 2289 total_bytes++; 2290 } 2291 (void) putc(c, outstr); 2292 if (isdata) { 2293 total_data_out++; 2294 total_data++; 2295 } 2296 total_bytes_out++; 2297 total_bytes++; 2298 if ((byte_count % 4096) == 0) 2299 (void) alarm(curclass.timeout); 2300 } 2301 (void) alarm(0); 2302 fflush(outstr); 2303 if (ferror(instr)) 2304 goto file_err; 2305 if (ferror(outstr)) 2306 goto data_err; 2307 rval = 0; 2308 goto cleanup_send_data; 2309 2310 case TYPE_I: 2311 case TYPE_L: 2312 filefd = fileno(instr); 2313 netfd = fileno(outstr); 2314 switch (send_data_with_mmap(filefd, netfd, st, isdata)) { 2315 2316 case SS_SUCCESS: 2317 break; 2318 2319 case SS_ABORTED: 2320 case SS_NO_TRANSFER: 2321 goto cleanup_send_data; 2322 2323 case SS_FILE_ERROR: 2324 goto file_err; 2325 2326 case SS_DATA_ERROR: 2327 goto data_err; 2328 } 2329 rval = 0; 2330 goto cleanup_send_data; 2331 2332 default: 2333 reply(550, "Unimplemented TYPE %d in send_data", type); 2334 goto cleanup_send_data; 2335 } 2336 2337 data_err: 2338 (void) alarm(0); 2339 perror_reply(426, "Data connection"); 2340 goto cleanup_send_data; 2341 2342 file_err: 2343 (void) alarm(0); 2344 perror_reply(551, "Error on input file"); 2345 goto cleanup_send_data; 2346 2347 cleanup_send_data: 2348 (void) alarm(0); 2349 transflag = 0; 2350 urgflag = 0; 2351 if (isdata) { 2352 total_files_out++; 2353 total_files++; 2354 } 2355 total_xfers_out++; 2356 total_xfers++; 2357 return (rval); 2358 } 2359 2360 /* 2361 * Transfer data from peer to "outstr" using the appropriate encapulation of 2362 * the data subject to Mode, Structure, and Type. 2363 * 2364 * N.B.: Form isn't handled. 2365 */ 2366 static int 2367 receive_data(FILE *instr, FILE *outstr) 2368 { 2369 int c, netfd, filefd, rval; 2370 int volatile bare_lfs; 2371 off_t byteswritten; 2372 char *buf; 2373 ssize_t readsize; 2374 struct sigaction sa, sa_saved; 2375 struct stat st; 2376 2377 memset(&sa, 0, sizeof(sa)); 2378 sigfillset(&sa.sa_mask); 2379 sa.sa_flags = SA_RESTART; 2380 sa.sa_handler = lostconn; 2381 (void) sigaction(SIGALRM, &sa, &sa_saved); 2382 2383 bare_lfs = 0; 2384 urgflag = 0; 2385 transflag = 1; 2386 rval = -1; 2387 byteswritten = 0; 2388 buf = NULL; 2389 2390 #define FILESIZECHECK(x) \ 2391 do { \ 2392 if (curclass.maxfilesize != -1 && \ 2393 (x) > curclass.maxfilesize) { \ 2394 errno = EFBIG; \ 2395 goto file_err; \ 2396 } \ 2397 } while (0) 2398 2399 switch (type) { 2400 2401 case TYPE_I: 2402 case TYPE_L: 2403 netfd = fileno(instr); 2404 filefd = fileno(outstr); 2405 (void) alarm(curclass.timeout); 2406 if (curclass.readsize) 2407 readsize = curclass.readsize; 2408 else if (fstat(filefd, &st) != -1) 2409 readsize = (ssize_t)st.st_blksize; 2410 else 2411 readsize = BUFSIZ; 2412 if ((buf = malloc(readsize)) == NULL) { 2413 perror_reply(451, "Local resource failure: malloc"); 2414 goto cleanup_recv_data; 2415 } 2416 if (curclass.rateput) { 2417 while (1) { 2418 int d; 2419 struct timeval then, now, td; 2420 off_t bufrem; 2421 2422 (void)gettimeofday(&then, NULL); 2423 errno = c = d = 0; 2424 for (bufrem = curclass.rateput; bufrem > 0; ) { 2425 if ((c = read(netfd, buf, 2426 MIN(readsize, bufrem))) <= 0) 2427 goto recvdone; 2428 if (urgflag && handleoobcmd()) 2429 goto cleanup_recv_data; 2430 FILESIZECHECK(byte_count + c); 2431 if ((d = write(filefd, buf, c)) != c) 2432 goto file_err; 2433 (void) alarm(curclass.timeout); 2434 bufrem -= c; 2435 byte_count += c; 2436 total_data_in += c; 2437 total_data += c; 2438 total_bytes_in += c; 2439 total_bytes += c; 2440 } 2441 (void)gettimeofday(&now, NULL); 2442 timersub(&now, &then, &td); 2443 if (td.tv_sec == 0) 2444 usleep(1000000 - td.tv_usec); 2445 } 2446 } else { 2447 while ((c = read(netfd, buf, readsize)) > 0) { 2448 if (urgflag && handleoobcmd()) 2449 goto cleanup_recv_data; 2450 FILESIZECHECK(byte_count + c); 2451 if (write(filefd, buf, c) != c) 2452 goto file_err; 2453 (void) alarm(curclass.timeout); 2454 byte_count += c; 2455 total_data_in += c; 2456 total_data += c; 2457 total_bytes_in += c; 2458 total_bytes += c; 2459 } 2460 } 2461 recvdone: 2462 if (c < 0) 2463 goto data_err; 2464 rval = 0; 2465 goto cleanup_recv_data; 2466 2467 case TYPE_E: 2468 reply(553, "TYPE E not implemented."); 2469 goto cleanup_recv_data; 2470 2471 case TYPE_A: 2472 (void) alarm(curclass.timeout); 2473 /* XXXLUKEM: rate limit ascii receive (put) */ 2474 while ((c = getc(instr)) != EOF) { 2475 if (urgflag && handleoobcmd()) 2476 goto cleanup_recv_data; 2477 byte_count++; 2478 total_data_in++; 2479 total_data++; 2480 total_bytes_in++; 2481 total_bytes++; 2482 if ((byte_count % 4096) == 0) 2483 (void) alarm(curclass.timeout); 2484 if (c == '\n') 2485 bare_lfs++; 2486 while (c == '\r') { 2487 if (ferror(outstr)) 2488 goto data_err; 2489 if ((c = getc(instr)) != '\n') { 2490 byte_count++; 2491 total_data_in++; 2492 total_data++; 2493 total_bytes_in++; 2494 total_bytes++; 2495 if ((byte_count % 4096) == 0) 2496 (void) alarm(curclass.timeout); 2497 byteswritten++; 2498 FILESIZECHECK(byteswritten); 2499 (void) putc ('\r', outstr); 2500 if (c == '\0' || c == EOF) 2501 goto contin2; 2502 } 2503 } 2504 byteswritten++; 2505 FILESIZECHECK(byteswritten); 2506 (void) putc(c, outstr); 2507 contin2: ; 2508 } 2509 (void) alarm(0); 2510 fflush(outstr); 2511 if (ferror(instr)) 2512 goto data_err; 2513 if (ferror(outstr)) 2514 goto file_err; 2515 if (bare_lfs) { 2516 reply(-226, 2517 "WARNING! %d bare linefeeds received in ASCII mode", 2518 bare_lfs); 2519 reply(0, "File may not have transferred correctly."); 2520 } 2521 rval = 0; 2522 goto cleanup_recv_data; 2523 2524 default: 2525 reply(550, "Unimplemented TYPE %d in receive_data", type); 2526 goto cleanup_recv_data; 2527 } 2528 #undef FILESIZECHECK 2529 2530 data_err: 2531 (void) alarm(0); 2532 perror_reply(426, "Data Connection"); 2533 goto cleanup_recv_data; 2534 2535 file_err: 2536 (void) alarm(0); 2537 perror_reply(452, "Error writing file"); 2538 goto cleanup_recv_data; 2539 2540 cleanup_recv_data: 2541 (void) alarm(0); 2542 (void) sigaction(SIGALRM, &sa_saved, NULL); 2543 if (buf) 2544 free(buf); 2545 transflag = 0; 2546 urgflag = 0; 2547 total_files_in++; 2548 total_files++; 2549 total_xfers_in++; 2550 total_xfers++; 2551 return (rval); 2552 } 2553 2554 void 2555 statcmd(void) 2556 { 2557 struct sockinet *su = NULL; 2558 static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 2559 unsigned char *a, *p; 2560 int ispassive, af; 2561 off_t otbi, otbo, otb; 2562 2563 a = p = NULL; 2564 2565 reply(-211, "%s FTP server status:", hostname); 2566 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 2567 hbuf[0] = '\0'; 2568 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 2569 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) 2570 && strcmp(remotehost, hbuf) != 0) 2571 reply(0, "Connected to %s (%s)", remotehost, hbuf); 2572 else 2573 reply(0, "Connected to %s", remotehost); 2574 2575 if (logged_in) { 2576 if (curclass.type == CLASS_GUEST) 2577 reply(0, "Logged in anonymously"); 2578 else 2579 reply(0, "Logged in as %s%s", pw->pw_name, 2580 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 2581 } else if (askpasswd) 2582 reply(0, "Waiting for password"); 2583 else 2584 reply(0, "Waiting for user name"); 2585 cprintf(stdout, " TYPE: %s", typenames[type]); 2586 if (type == TYPE_A || type == TYPE_E) 2587 cprintf(stdout, ", FORM: %s", formnames[form]); 2588 if (type == TYPE_L) { 2589 #if NBBY == 8 2590 cprintf(stdout, " %d", NBBY); 2591 #else 2592 /* XXX: `bytesize' needs to be defined in this case */ 2593 cprintf(stdout, " %d", bytesize); 2594 #endif 2595 } 2596 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 2597 strunames[stru], modenames[mode]); 2598 ispassive = 0; 2599 if (data != -1) { 2600 reply(0, "Data connection open"); 2601 su = NULL; 2602 } else if (pdata != -1) { 2603 reply(0, "in Passive mode"); 2604 if (curclass.advertise.su_len != 0) 2605 su = &curclass.advertise; 2606 else 2607 su = &pasv_addr; 2608 ispassive = 1; 2609 goto printaddr; 2610 } else if (usedefault == 0) { 2611 su = (struct sockinet *)&data_dest; 2612 2613 if (epsvall) { 2614 reply(0, "EPSV only mode (EPSV ALL)"); 2615 goto epsvonly; 2616 } 2617 printaddr: 2618 /* PASV/PORT */ 2619 if (su->su_family == AF_INET) { 2620 a = (unsigned char *) &su->su_addr; 2621 p = (unsigned char *) &su->su_port; 2622 #define UC(b) (((int) b) & 0xff) 2623 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 2624 ispassive ? "PASV" : "PORT" , 2625 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2626 UC(p[0]), UC(p[1])); 2627 } 2628 2629 /* LPSV/LPRT */ 2630 { 2631 int alen, i; 2632 2633 alen = 0; 2634 switch (su->su_family) { 2635 case AF_INET: 2636 a = (unsigned char *) &su->su_addr; 2637 p = (unsigned char *) &su->su_port; 2638 alen = sizeof(su->su_addr); 2639 af = 4; 2640 break; 2641 #ifdef INET6 2642 case AF_INET6: 2643 a = (unsigned char *) &su->su_6addr; 2644 p = (unsigned char *) &su->su_port; 2645 alen = sizeof(su->su_6addr); 2646 af = 6; 2647 break; 2648 #endif 2649 default: 2650 af = 0; 2651 break; 2652 } 2653 if (af) { 2654 cprintf(stdout, " %s (%d,%d", 2655 ispassive ? "LPSV" : "LPRT", af, alen); 2656 for (i = 0; i < alen; i++) 2657 cprintf(stdout, ",%d", UC(a[i])); 2658 cprintf(stdout, ",%d,%d,%d)\r\n", 2659 2, UC(p[0]), UC(p[1])); 2660 #undef UC 2661 } 2662 } 2663 2664 /* EPRT/EPSV */ 2665 epsvonly: 2666 af = af2epsvproto(su->su_family); 2667 hbuf[0] = '\0'; 2668 if (af > 0) { 2669 struct sockinet tmp; 2670 2671 tmp = *su; 2672 #ifdef INET6 2673 if (tmp.su_family == AF_INET6) 2674 tmp.su_scope_id = 0; 2675 #endif 2676 if (getnameinfo((struct sockaddr *)&tmp.si_su, 2677 tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 2678 NI_NUMERICHOST | NI_NUMERICSERV) == 0) 2679 reply(0, "%s (|%d|%s|%s|)", 2680 ispassive ? "EPSV" : "EPRT", 2681 af, hbuf, sbuf); 2682 } 2683 } else 2684 reply(0, "No data connection"); 2685 2686 if (logged_in) { 2687 reply(0, 2688 "Data sent: " LLF " byte%s in " LLF " file%s", 2689 (LLT)total_data_out, PLURAL(total_data_out), 2690 (LLT)total_files_out, PLURAL(total_files_out)); 2691 reply(0, 2692 "Data received: " LLF " byte%s in " LLF " file%s", 2693 (LLT)total_data_in, PLURAL(total_data_in), 2694 (LLT)total_files_in, PLURAL(total_files_in)); 2695 reply(0, 2696 "Total data: " LLF " byte%s in " LLF " file%s", 2697 (LLT)total_data, PLURAL(total_data), 2698 (LLT)total_files, PLURAL(total_files)); 2699 } 2700 otbi = total_bytes_in; 2701 otbo = total_bytes_out; 2702 otb = total_bytes; 2703 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 2704 (LLT)otbo, PLURAL(otbo), 2705 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 2706 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 2707 (LLT)otbi, PLURAL(otbi), 2708 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 2709 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 2710 (LLT)otb, PLURAL(otb), 2711 (LLT)total_xfers, PLURAL(total_xfers)); 2712 2713 if (logged_in && !CURCLASS_FLAGS_ISSET(private)) { 2714 struct ftpconv *cp; 2715 2716 reply(0, "%s", ""); 2717 reply(0, "Class: %s, type: %s", 2718 curclass.classname, CURCLASSTYPE); 2719 reply(0, "Check PORT/LPRT commands: %sabled", 2720 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 2721 if (! EMPTYSTR(curclass.display)) 2722 reply(0, "Display file: %s", curclass.display); 2723 if (! EMPTYSTR(curclass.notify)) 2724 reply(0, "Notify fileglob: %s", curclass.notify); 2725 reply(0, "Idle timeout: " LLF ", maximum timeout: " LLF, 2726 (LLT)curclass.timeout, (LLT)curclass.maxtimeout); 2727 reply(0, "Current connections: %d", connections); 2728 if (curclass.limit == -1) 2729 reply(0, "Maximum connections: unlimited"); 2730 else 2731 reply(0, "Maximum connections: " LLF, 2732 (LLT)curclass.limit); 2733 if (curclass.limitfile) 2734 reply(0, "Connection limit exceeded message file: %s", 2735 conffilename(curclass.limitfile)); 2736 if (! EMPTYSTR(curclass.chroot)) 2737 reply(0, "Chroot format: %s", curclass.chroot); 2738 reply(0, "Deny bad ftpusers(5) quickly: %sabled", 2739 CURCLASS_FLAGS_ISSET(denyquick) ? "en" : "dis"); 2740 if (! EMPTYSTR(curclass.homedir)) 2741 reply(0, "Homedir format: %s", curclass.homedir); 2742 if (curclass.maxfilesize == -1) 2743 reply(0, "Maximum file size: unlimited"); 2744 else 2745 reply(0, "Maximum file size: " LLF, 2746 (LLT)curclass.maxfilesize); 2747 if (! EMPTYSTR(curclass.motd)) 2748 reply(0, "MotD file: %s", conffilename(curclass.motd)); 2749 reply(0, 2750 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2751 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2752 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2753 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2754 reply(0, "Sanitize file names: %sabled", 2755 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2756 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2757 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2758 if (curclass.advertise.su_len != 0) { 2759 char buf[50]; /* big enough for IPv6 address */ 2760 const char *bp; 2761 2762 bp = inet_ntop(curclass.advertise.su_family, 2763 (void *)&curclass.advertise.su_addr, 2764 buf, sizeof(buf)); 2765 if (bp != NULL) 2766 reply(0, "PASV advertise address: %s", bp); 2767 } 2768 if (curclass.portmin && curclass.portmax) 2769 reply(0, "PASV port range: " LLF " - " LLF, 2770 (LLT)curclass.portmin, (LLT)curclass.portmax); 2771 if (curclass.rateget) 2772 reply(0, "Rate get limit: " LLF " bytes/sec", 2773 (LLT)curclass.rateget); 2774 else 2775 reply(0, "Rate get limit: disabled"); 2776 if (curclass.rateput) 2777 reply(0, "Rate put limit: " LLF " bytes/sec", 2778 (LLT)curclass.rateput); 2779 else 2780 reply(0, "Rate put limit: disabled"); 2781 if (curclass.mmapsize) 2782 reply(0, "Mmap size: " LLF, (LLT)curclass.mmapsize); 2783 else 2784 reply(0, "Mmap size: disabled"); 2785 if (curclass.readsize) 2786 reply(0, "Read size: " LLF, (LLT)curclass.readsize); 2787 else 2788 reply(0, "Read size: default"); 2789 if (curclass.writesize) 2790 reply(0, "Write size: " LLF, (LLT)curclass.writesize); 2791 else 2792 reply(0, "Write size: default"); 2793 if (curclass.recvbufsize) 2794 reply(0, "Receive buffer size: " LLF, 2795 (LLT)curclass.recvbufsize); 2796 else 2797 reply(0, "Receive buffer size: default"); 2798 if (curclass.sendbufsize) 2799 reply(0, "Send buffer size: " LLF, 2800 (LLT)curclass.sendbufsize); 2801 else 2802 reply(0, "Send buffer size: default"); 2803 if (curclass.sendlowat) 2804 reply(0, "Send low water mark: " LLF, 2805 (LLT)curclass.sendlowat); 2806 else 2807 reply(0, "Send low water mark: default"); 2808 reply(0, "Umask: %.04o", curclass.umask); 2809 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2810 if (cp->suffix == NULL || cp->types == NULL || 2811 cp->command == NULL) 2812 continue; 2813 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2814 cp->suffix, cp->types, cp->disable, cp->command); 2815 } 2816 } 2817 2818 reply(211, "End of status"); 2819 } 2820 2821 void 2822 fatal(const char *s) 2823 { 2824 2825 reply(451, "Error in server: %s\n", s); 2826 reply(221, "Closing connection due to server error."); 2827 dologout(0); 2828 /* NOTREACHED */ 2829 } 2830 2831 /* 2832 * reply() -- 2833 * depending on the value of n, display fmt with a trailing CRLF and 2834 * prefix of: 2835 * n < -1 prefix the message with abs(n) + "-" (initial line) 2836 * n == 0 prefix the message with 4 spaces (middle lines) 2837 * n > 0 prefix the message with n + " " (final line) 2838 */ 2839 void 2840 reply(int n, const char *fmt, ...) 2841 { 2842 char msg[MAXPATHLEN * 2 + 100]; 2843 size_t b; 2844 va_list ap; 2845 2846 if (n == 0) 2847 b = snprintf(msg, sizeof(msg), " "); 2848 else if (n < 0) 2849 b = snprintf(msg, sizeof(msg), "%d-", -n); 2850 else 2851 b = snprintf(msg, sizeof(msg), "%d ", n); 2852 va_start(ap, fmt); 2853 vsnprintf(msg + b, sizeof(msg) - b, fmt, ap); 2854 va_end(ap); 2855 cprintf(stdout, "%s\r\n", msg); 2856 (void)fflush(stdout); 2857 if (ftpd_debug) 2858 syslog(LOG_DEBUG, "<--- %s", msg); 2859 } 2860 2861 static void 2862 logremotehost(struct sockinet *who) 2863 { 2864 2865 #if defined(HAVE_SOCKADDR_SNPRINTF) 2866 char abuf[MAXHOSTNAMELEN]; 2867 #endif 2868 2869 struct sockaddr *sa = (struct sockaddr *)&who->si_su; 2870 if (getnameinfo(sa, who->su_len, remotehost, sizeof(remotehost), NULL, 2871 0, getnameopts)) 2872 strlcpy(remotehost, "?", sizeof(remotehost)); 2873 #if defined(HAVE_SOCKADDR_SNPRINTF) 2874 sockaddr_snprintf(abuf, sizeof(abuf), "%a", sa); 2875 snprintf(remoteloghost, sizeof(remoteloghost), "%s(%s)", remotehost, 2876 abuf); 2877 #else 2878 strlcpy(remoteloghost, remotehost, sizeof(remoteloghost)); 2879 #endif 2880 2881 #if defined(HAVE_SETPROCTITLE) 2882 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2883 setproctitle("%s", proctitle); 2884 #endif /* defined(HAVE_SETPROCTITLE) */ 2885 if (logging) 2886 syslog(LOG_INFO, "connection from %s to %s", 2887 remoteloghost, hostname); 2888 } 2889 2890 /* 2891 * Record logout in wtmp file and exit with supplied status. 2892 * NOTE: because this is called from signal handlers it cannot 2893 * use stdio (or call other functions that use stdio). 2894 */ 2895 void 2896 dologout(int status) 2897 { 2898 /* 2899 * Prevent reception of SIGURG from resulting in a resumption 2900 * back to the main program loop. 2901 */ 2902 transflag = 0; 2903 logout_utmp(); 2904 if (logged_in) { 2905 #ifdef KERBEROS 2906 if (!notickets && krbtkfile_env) 2907 unlink(krbtkfile_env); 2908 #endif 2909 } 2910 /* beware of flushing buffers after a SIGPIPE */ 2911 if (xferlogfd != -1) 2912 close(xferlogfd); 2913 _exit(status); 2914 } 2915 2916 void 2917 abor(void) 2918 { 2919 2920 if (!transflag) 2921 return; 2922 tmpline[0] = '\0'; 2923 is_oob = 0; 2924 reply(426, "Transfer aborted. Data connection closed."); 2925 reply(226, "Abort successful"); 2926 transflag = 0; /* flag that the transfer has aborted */ 2927 } 2928 2929 void 2930 statxfer(void) 2931 { 2932 2933 if (!transflag) 2934 return; 2935 tmpline[0] = '\0'; 2936 is_oob = 0; 2937 if (file_size != (off_t) -1) 2938 reply(213, 2939 "Status: " LLF " of " LLF " byte%s transferred", 2940 (LLT)byte_count, (LLT)file_size, 2941 PLURAL(byte_count)); 2942 else 2943 reply(213, "Status: " LLF " byte%s transferred", 2944 (LLT)byte_count, PLURAL(byte_count)); 2945 } 2946 2947 /* 2948 * Call when urgflag != 0 to handle Out Of Band commands. 2949 * Returns non zero if the OOB command aborted the transfer 2950 * by setting transflag to 0. (c.f., "ABOR"). 2951 */ 2952 static int 2953 handleoobcmd(void) 2954 { 2955 char *cp; 2956 int ret; 2957 2958 if (!urgflag) 2959 return (0); 2960 urgflag = 0; 2961 /* only process if transfer occurring */ 2962 if (!transflag) 2963 return (0); 2964 cp = tmpline; 2965 ret = get_line(cp, sizeof(tmpline)-1, stdin); 2966 if (ret == -1) { 2967 reply(221, "You could at least say goodbye."); 2968 dologout(0); 2969 } else if (ret == -2) { 2970 /* Ignore truncated command */ 2971 /* XXX: abort xfer with "500 command too long", & return 1 ? */ 2972 return 0; 2973 } 2974 /* 2975 * Manually parse OOB commands, because we can't 2976 * recursively call the yacc parser... 2977 */ 2978 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2979 abor(); 2980 } else if (strcasecmp(cp, "STAT\r\n") == 0) { 2981 statxfer(); 2982 } else { 2983 /* XXX: error with "500 unknown command" ? */ 2984 } 2985 return (transflag == 0); 2986 } 2987 2988 static int 2989 bind_pasv_addr(void) 2990 { 2991 static int passiveport; 2992 int port, len; 2993 2994 len = pasv_addr.su_len; 2995 if (curclass.portmin == 0 && curclass.portmax == 0) { 2996 pasv_addr.su_port = 0; 2997 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2998 } 2999 3000 if (passiveport == 0) { 3001 srand(getpid()); 3002 passiveport = rand() % (curclass.portmax - curclass.portmin) 3003 + curclass.portmin; 3004 } 3005 3006 port = passiveport; 3007 while (1) { 3008 port++; 3009 if (port > curclass.portmax) 3010 port = curclass.portmin; 3011 else if (port == passiveport) { 3012 errno = EAGAIN; 3013 return (-1); 3014 } 3015 pasv_addr.su_port = htons(port); 3016 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 3017 break; 3018 if (errno != EADDRINUSE) 3019 return (-1); 3020 } 3021 passiveport = port; 3022 return (0); 3023 } 3024 3025 /* 3026 * Note: a response of 425 is not mentioned as a possible response to 3027 * the PASV command in RFC959. However, it has been blessed as 3028 * a legitimate response by Jon Postel in a telephone conversation 3029 * with Rick Adams on 25 Jan 89. 3030 */ 3031 void 3032 passive(void) 3033 { 3034 socklen_t len; 3035 int recvbufsize; 3036 char *p, *a; 3037 3038 if (pdata >= 0) 3039 close(pdata); 3040 pdata = socket(AF_INET, SOCK_STREAM, 0); 3041 if (pdata < 0 || !logged_in) { 3042 perror_reply(425, "Can't open passive connection"); 3043 return; 3044 } 3045 pasv_addr = ctrl_addr; 3046 3047 if (bind_pasv_addr() < 0) 3048 goto pasv_error; 3049 len = pasv_addr.su_len; 3050 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 3051 goto pasv_error; 3052 pasv_addr.su_len = len; 3053 if (curclass.recvbufsize) { 3054 recvbufsize = curclass.recvbufsize; 3055 if (setsockopt(pdata, SOL_SOCKET, SO_RCVBUF, &recvbufsize, 3056 sizeof(int)) == -1) 3057 syslog(LOG_WARNING, "setsockopt(SO_RCVBUF, %d): %m", 3058 recvbufsize); 3059 } 3060 if (listen(pdata, 1) < 0) 3061 goto pasv_error; 3062 if (curclass.advertise.su_len != 0) 3063 a = (char *) &curclass.advertise.su_addr; 3064 else 3065 a = (char *) &pasv_addr.su_addr; 3066 p = (char *) &pasv_addr.su_port; 3067 3068 #define UC(b) (((int) b) & 0xff) 3069 3070 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 3071 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 3072 return; 3073 3074 pasv_error: 3075 (void) close(pdata); 3076 pdata = -1; 3077 perror_reply(425, "Can't open passive connection"); 3078 return; 3079 } 3080 3081 /* 3082 * convert protocol identifier to/from AF 3083 */ 3084 int 3085 lpsvproto2af(int proto) 3086 { 3087 3088 switch (proto) { 3089 case 4: 3090 return AF_INET; 3091 #ifdef INET6 3092 case 6: 3093 return AF_INET6; 3094 #endif 3095 default: 3096 return -1; 3097 } 3098 } 3099 3100 int 3101 af2lpsvproto(int af) 3102 { 3103 3104 switch (af) { 3105 case AF_INET: 3106 return 4; 3107 #ifdef INET6 3108 case AF_INET6: 3109 return 6; 3110 #endif 3111 default: 3112 return -1; 3113 } 3114 } 3115 3116 int 3117 epsvproto2af(int proto) 3118 { 3119 3120 switch (proto) { 3121 case 1: 3122 return AF_INET; 3123 #ifdef INET6 3124 case 2: 3125 return AF_INET6; 3126 #endif 3127 default: 3128 return -1; 3129 } 3130 } 3131 3132 int 3133 af2epsvproto(int af) 3134 { 3135 3136 switch (af) { 3137 case AF_INET: 3138 return 1; 3139 #ifdef INET6 3140 case AF_INET6: 3141 return 2; 3142 #endif 3143 default: 3144 return -1; 3145 } 3146 } 3147 3148 /* 3149 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 3150 * 229 Entering Extended Passive Mode (|||port|) 3151 */ 3152 void 3153 long_passive(const char *cmd, int pf) 3154 { 3155 socklen_t len; 3156 char *p, *a; 3157 3158 if (!logged_in) { 3159 syslog(LOG_NOTICE, "long passive but not logged in"); 3160 reply(503, "Login with USER first."); 3161 return; 3162 } 3163 3164 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 3165 /* 3166 * XXX: only EPRT/EPSV ready clients will understand this 3167 */ 3168 if (strcmp(cmd, "EPSV") != 0) 3169 reply(501, "Network protocol mismatch"); /*XXX*/ 3170 else 3171 epsv_protounsupp("Network protocol mismatch"); 3172 3173 return; 3174 } 3175 3176 if (pdata >= 0) 3177 close(pdata); 3178 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 3179 if (pdata < 0) { 3180 perror_reply(425, "Can't open passive connection"); 3181 return; 3182 } 3183 pasv_addr = ctrl_addr; 3184 if (bind_pasv_addr() < 0) 3185 goto pasv_error; 3186 len = pasv_addr.su_len; 3187 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 3188 goto pasv_error; 3189 pasv_addr.su_len = len; 3190 if (listen(pdata, 1) < 0) 3191 goto pasv_error; 3192 p = (char *) &pasv_addr.su_port; 3193 3194 #define UC(b) (((int) b) & 0xff) 3195 3196 if (strcmp(cmd, "LPSV") == 0) { 3197 struct sockinet *advert; 3198 3199 if (curclass.advertise.su_len != 0) 3200 advert = &curclass.advertise; 3201 else 3202 advert = &pasv_addr; 3203 switch (advert->su_family) { 3204 case AF_INET: 3205 a = (char *) &advert->su_addr; 3206 reply(228, 3207 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3208 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3209 2, UC(p[0]), UC(p[1])); 3210 return; 3211 #ifdef INET6 3212 case AF_INET6: 3213 a = (char *) &advert->su_6addr; 3214 reply(228, 3215 "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)", 3216 6, 16, 3217 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3218 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3219 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3220 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3221 2, UC(p[0]), UC(p[1])); 3222 return; 3223 #endif 3224 } 3225 #undef UC 3226 } else if (strcmp(cmd, "EPSV") == 0) { 3227 switch (pasv_addr.su_family) { 3228 case AF_INET: 3229 #ifdef INET6 3230 case AF_INET6: 3231 #endif 3232 reply(229, "Entering Extended Passive Mode (|||%d|)", 3233 ntohs(pasv_addr.su_port)); 3234 return; 3235 } 3236 } else { 3237 /* more proper error code? */ 3238 } 3239 3240 pasv_error: 3241 (void) close(pdata); 3242 pdata = -1; 3243 perror_reply(425, "Can't open passive connection"); 3244 return; 3245 } 3246 3247 int 3248 extended_port(const char *arg) 3249 { 3250 char *tmp = NULL; 3251 char *result[3]; 3252 char *p, *q; 3253 char delim; 3254 struct addrinfo hints; 3255 struct addrinfo *res = NULL; 3256 int i; 3257 unsigned long proto; 3258 3259 tmp = ftpd_strdup(arg); 3260 p = tmp; 3261 delim = p[0]; 3262 p++; 3263 memset(result, 0, sizeof(result)); 3264 for (i = 0; i < 3; i++) { 3265 q = strchr(p, delim); 3266 if (!q || *q != delim) 3267 goto parsefail; 3268 *q++ = '\0'; 3269 result[i] = p; 3270 p = q; 3271 } 3272 3273 /* some more sanity checks */ 3274 errno = 0; 3275 p = NULL; 3276 (void)strtoul(result[2], &p, 10); 3277 if (errno || !*result[2] || *p) 3278 goto parsefail; 3279 errno = 0; 3280 p = NULL; 3281 proto = strtoul(result[0], &p, 10); 3282 if (errno || !*result[0] || *p) 3283 goto protounsupp; 3284 3285 memset(&hints, 0, sizeof(hints)); 3286 hints.ai_family = epsvproto2af((int)proto); 3287 if (hints.ai_family < 0) 3288 goto protounsupp; 3289 hints.ai_socktype = SOCK_STREAM; 3290 hints.ai_flags = AI_NUMERICHOST; 3291 if (getaddrinfo(result[1], result[2], &hints, &res)) 3292 goto parsefail; 3293 if (res->ai_next) 3294 goto parsefail; 3295 if (sizeof(data_dest) < res->ai_addrlen) 3296 goto parsefail; 3297 memcpy(&data_dest.si_su, res->ai_addr, res->ai_addrlen); 3298 data_dest.su_len = res->ai_addrlen; 3299 #ifdef INET6 3300 if (his_addr.su_family == AF_INET6 && 3301 data_dest.su_family == AF_INET6) { 3302 /* XXX: more sanity checks! */ 3303 data_dest.su_scope_id = his_addr.su_scope_id; 3304 } 3305 #endif 3306 3307 if (tmp != NULL) 3308 free(tmp); 3309 if (res) 3310 freeaddrinfo(res); 3311 return 0; 3312 3313 parsefail: 3314 reply(500, "Invalid argument, rejected."); 3315 usedefault = 1; 3316 if (tmp != NULL) 3317 free(tmp); 3318 if (res) 3319 freeaddrinfo(res); 3320 return -1; 3321 3322 protounsupp: 3323 epsv_protounsupp("Protocol not supported"); 3324 usedefault = 1; 3325 if (tmp != NULL) 3326 free(tmp); 3327 return -1; 3328 } 3329 3330 /* 3331 * 522 Protocol not supported (proto,...) 3332 * as we assume address family for control and data connections are the same, 3333 * we do not return the list of address families we support - instead, we 3334 * return the address family of the control connection. 3335 */ 3336 void 3337 epsv_protounsupp(const char *message) 3338 { 3339 int proto; 3340 3341 proto = af2epsvproto(ctrl_addr.su_family); 3342 if (proto < 0) 3343 reply(501, "%s", message); /* XXX */ 3344 else 3345 reply(522, "%s, use (%d)", message, proto); 3346 } 3347 3348 /* 3349 * Generate unique name for file with basename "local". 3350 * The file named "local" is already known to exist. 3351 * Generates failure reply on error. 3352 * 3353 * XXX: this function should under go changes similar to 3354 * the mktemp(3)/mkstemp(3) changes. 3355 */ 3356 static char * 3357 gunique(const char *local) 3358 { 3359 static char new[MAXPATHLEN]; 3360 struct stat st; 3361 char *cp; 3362 int count; 3363 3364 cp = strrchr(local, '/'); 3365 if (cp) 3366 *cp = '\0'; 3367 if (stat(cp ? local : ".", &st) < 0) { 3368 perror_reply(553, cp ? local : "."); 3369 return (NULL); 3370 } 3371 if (cp) 3372 *cp = '/'; 3373 for (count = 1; count < 100; count++) { 3374 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 3375 if (stat(new, &st) < 0) 3376 return (new); 3377 } 3378 reply(452, "Unique file name cannot be created."); 3379 return (NULL); 3380 } 3381 3382 /* 3383 * Format and send reply containing system error number. 3384 */ 3385 void 3386 perror_reply(int code, const char *string) 3387 { 3388 int save_errno; 3389 3390 save_errno = errno; 3391 reply(code, "%s: %s.", string, strerror(errno)); 3392 errno = save_errno; 3393 } 3394 3395 static char *onefile[] = { 3396 NULL, 3397 0 3398 }; 3399 3400 void 3401 send_file_list(const char *whichf) 3402 { 3403 struct stat st; 3404 DIR *dirp; 3405 struct dirent *dir; 3406 FILE *volatile dout; 3407 char **volatile dirlist; 3408 char *dirname, *p; 3409 char *notglob; 3410 int volatile simple; 3411 int volatile freeglob; 3412 glob_t gl; 3413 3414 dirp = NULL; 3415 dout = NULL; 3416 notglob = NULL; 3417 simple = 0; 3418 freeglob = 0; 3419 urgflag = 0; 3420 3421 p = NULL; 3422 if (strpbrk(whichf, "~{[*?") != NULL) { 3423 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; 3424 3425 memset(&gl, 0, sizeof(gl)); 3426 freeglob = 1; 3427 if (glob(whichf, flags, 0, &gl)) { 3428 reply(450, "Not found"); 3429 goto cleanup_send_file_list; 3430 } else if (gl.gl_pathc == 0) { 3431 errno = ENOENT; 3432 perror_reply(450, whichf); 3433 goto cleanup_send_file_list; 3434 } 3435 dirlist = gl.gl_pathv; 3436 } else { 3437 notglob = ftpd_strdup(whichf); 3438 onefile[0] = notglob; 3439 dirlist = onefile; 3440 simple = 1; 3441 } 3442 /* XXX: } for vi sm */ 3443 3444 while ((dirname = *dirlist++) != NULL) { 3445 int trailingslash = 0; 3446 3447 if (stat(dirname, &st) < 0) { 3448 /* 3449 * If user typed "ls -l", etc, and the client 3450 * used NLST, do what the user meant. 3451 */ 3452 /* XXX: nuke this support? */ 3453 if (dirname[0] == '-' && *dirlist == NULL && 3454 transflag == 0) { 3455 const char *argv[] = { INTERNAL_LS, "", NULL }; 3456 3457 argv[1] = dirname; 3458 retrieve(argv, dirname); 3459 goto cleanup_send_file_list; 3460 } 3461 perror_reply(450, whichf); 3462 goto cleanup_send_file_list; 3463 } 3464 3465 if (S_ISREG(st.st_mode)) { 3466 /* 3467 * XXXRFC: 3468 * should we follow RFC959 and not work 3469 * for non directories? 3470 */ 3471 if (dout == NULL) { 3472 dout = dataconn("file list", (off_t)-1, "w"); 3473 if (dout == NULL) 3474 goto cleanup_send_file_list; 3475 transflag = 1; 3476 } 3477 cprintf(dout, "%s%s\n", dirname, 3478 type == TYPE_A ? "\r" : ""); 3479 continue; 3480 } else if (!S_ISDIR(st.st_mode)) 3481 continue; 3482 3483 if (dirname[strlen(dirname) - 1] == '/') 3484 trailingslash++; 3485 3486 if ((dirp = opendir(dirname)) == NULL) 3487 continue; 3488 3489 while ((dir = readdir(dirp)) != NULL) { 3490 char nbuf[MAXPATHLEN]; 3491 3492 if (urgflag && handleoobcmd()) { 3493 (void) closedir(dirp); 3494 goto cleanup_send_file_list; 3495 } 3496 3497 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 3498 continue; 3499 3500 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 3501 trailingslash ? "" : "/", dir->d_name); 3502 3503 /* 3504 * We have to do a stat to ensure it's 3505 * not a directory or special file. 3506 */ 3507 /* 3508 * XXXRFC: 3509 * should we follow RFC959 and filter out 3510 * non files ? lukem - NO!, or not until 3511 * our ftp client uses MLS{T,D} for completion. 3512 */ 3513 if (simple || (stat(nbuf, &st) == 0 && 3514 S_ISREG(st.st_mode))) { 3515 if (dout == NULL) { 3516 dout = dataconn("file list", (off_t)-1, 3517 "w"); 3518 if (dout == NULL) { 3519 (void) closedir(dirp); 3520 goto cleanup_send_file_list; 3521 } 3522 transflag = 1; 3523 } 3524 p = nbuf; 3525 if (nbuf[0] == '.' && nbuf[1] == '/') 3526 p = &nbuf[2]; 3527 cprintf(dout, "%s%s\n", p, 3528 type == TYPE_A ? "\r" : ""); 3529 } 3530 } 3531 (void) closedir(dirp); 3532 } 3533 3534 if (dout == NULL) 3535 reply(450, "No files found."); 3536 else if (ferror(dout) != 0) 3537 perror_reply(451, "Data connection"); 3538 else 3539 reply(226, "Transfer complete."); 3540 3541 cleanup_send_file_list: 3542 closedataconn(dout); 3543 transflag = 0; 3544 urgflag = 0; 3545 total_xfers++; 3546 total_xfers_out++; 3547 if (notglob) 3548 free(notglob); 3549 if (freeglob) 3550 globfree(&gl); 3551 } 3552 3553 char * 3554 conffilename(const char *s) 3555 { 3556 static char filename[MAXPATHLEN]; 3557 3558 if (*s == '/') 3559 strlcpy(filename, s, sizeof(filename)); 3560 else 3561 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 3562 return (filename); 3563 } 3564 3565 /* 3566 * logxfer -- 3567 * if logging > 1, then based on the arguments, syslog a message: 3568 * if bytes != -1 "<command> <file1> = <bytes> bytes" 3569 * else if file2 != NULL "<command> <file1> <file2>" 3570 * else "<command> <file1>" 3571 * if elapsed != NULL, append "in xxx.yyy seconds" 3572 * if error != NULL, append ": " + error 3573 * 3574 * if doxferlog != 0, bytes != -1, and command is "get", "put", 3575 * or "append", syslog and/or write a wu-ftpd style xferlog entry 3576 */ 3577 void 3578 logxfer(const char *command, off_t bytes, const char *file1, const char *file2, 3579 const struct timeval *elapsed, const char *error) 3580 { 3581 char buf[MAXPATHLEN * 2 + 100]; 3582 char realfile1[MAXPATHLEN], realfile2[MAXPATHLEN]; 3583 const char *r1, *r2; 3584 char direction; 3585 size_t len; 3586 time_t now; 3587 3588 if (logging <=1 && !doxferlog) 3589 return; 3590 3591 r1 = r2 = NULL; 3592 if ((r1 = realpath(file1, realfile1)) == NULL) 3593 r1 = file1; 3594 if (file2 != NULL) 3595 if ((r2 = realpath(file2, realfile2)) == NULL) 3596 r2 = file2; 3597 3598 /* 3599 * syslog command 3600 */ 3601 if (logging > 1) { 3602 len = snprintf(buf, sizeof(buf), "%s %s", command, r1); 3603 if (bytes != (off_t)-1) 3604 len += snprintf(buf + len, sizeof(buf) - len, 3605 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 3606 else if (r2 != NULL) 3607 len += snprintf(buf + len, sizeof(buf) - len, 3608 " %s", r2); 3609 if (elapsed != NULL) 3610 len += snprintf(buf + len, sizeof(buf) - len, 3611 " in " LLF ".%.03ld seconds", 3612 (LLT)elapsed->tv_sec, 3613 (long)(elapsed->tv_usec / 1000)); 3614 if (error != NULL) 3615 len += snprintf(buf + len, sizeof(buf) - len, 3616 ": %s", error); 3617 syslog(LOG_INFO, "%s", buf); 3618 } 3619 3620 /* 3621 * syslog wu-ftpd style log entry, prefixed with "xferlog: " 3622 */ 3623 if (!doxferlog || bytes == -1) 3624 return; 3625 3626 if (strcmp(command, "get") == 0) 3627 direction = 'o'; 3628 else if (strcmp(command, "put") == 0 || strcmp(command, "append") == 0) 3629 direction = 'i'; 3630 else 3631 return; 3632 3633 time(&now); 3634 len = snprintf(buf, sizeof(buf), 3635 "%.24s " LLF " %s " LLF " %s %c %s %c %c %s FTP 0 * %c\n", 3636 3637 /* 3638 * XXX: wu-ftpd puts ' (send)' or ' (recv)' in the syslog message, and removes 3639 * the full date. This may be problematic for accurate log parsing, 3640 * given that syslog messages don't contain the full date. 3641 */ 3642 ctime(&now), 3643 (LLT) 3644 (elapsed == NULL ? 0 : elapsed->tv_sec + (elapsed->tv_usec > 0)), 3645 remotehost, 3646 (LLT) bytes, 3647 r1, 3648 type == TYPE_A ? 'a' : 'b', 3649 "_", /* XXX: take conversions into account? */ 3650 direction, 3651 3652 curclass.type == CLASS_GUEST ? 'a' : 3653 curclass.type == CLASS_CHROOT ? 'g' : 3654 curclass.type == CLASS_REAL ? 'r' : '?', 3655 3656 curclass.type == CLASS_GUEST ? pw->pw_passwd : pw->pw_name, 3657 error != NULL ? 'i' : 'c' 3658 ); 3659 3660 if ((doxferlog & 2) && xferlogfd != -1) 3661 write(xferlogfd, buf, len); 3662 if ((doxferlog & 1)) { 3663 buf[len-1] = '\n'; /* strip \n from syslog message */ 3664 syslog(LOG_INFO, "xferlog: %s", buf); 3665 } 3666 } 3667 3668 /* 3669 * Log the resource usage. 3670 * 3671 * XXX: more resource usage to logging? 3672 */ 3673 void 3674 logrusage(const struct rusage *rusage_before, 3675 const struct rusage *rusage_after) 3676 { 3677 struct timeval usrtime, systime; 3678 3679 if (logging <= 1) 3680 return; 3681 3682 timersub(&rusage_after->ru_utime, &rusage_before->ru_utime, &usrtime); 3683 timersub(&rusage_after->ru_stime, &rusage_before->ru_stime, &systime); 3684 syslog(LOG_INFO, LLF ".%.03ldu " LLF ".%.03lds %ld+%ldio %ldpf+%ldw", 3685 (LLT)usrtime.tv_sec, (long)(usrtime.tv_usec / 1000), 3686 (LLT)systime.tv_sec, (long)(systime.tv_usec / 1000), 3687 rusage_after->ru_inblock - rusage_before->ru_inblock, 3688 rusage_after->ru_oublock - rusage_before->ru_oublock, 3689 rusage_after->ru_majflt - rusage_before->ru_majflt, 3690 rusage_after->ru_nswap - rusage_before->ru_nswap); 3691 } 3692 3693 /* 3694 * Determine if `password' is valid for user given in `pw'. 3695 * Returns 2 if password expired, 1 if otherwise failed, 0 if ok 3696 */ 3697 int 3698 checkpassword(const struct passwd *pwent, const char *password) 3699 { 3700 const char *orig; 3701 char *new; 3702 time_t change, expire, now; 3703 3704 change = expire = 0; 3705 if (pwent == NULL) 3706 return 1; 3707 3708 time(&now); 3709 orig = pwent->pw_passwd; /* save existing password */ 3710 expire = pwent->pw_expire; 3711 change = pwent->pw_change; 3712 if (change == _PASSWORD_CHGNOW) 3713 change = now; 3714 3715 if (orig[0] == '\0') /* don't allow empty passwords */ 3716 return 1; 3717 3718 new = crypt(password, orig); /* encrypt given password */ 3719 if (strcmp(new, orig) != 0) /* compare */ 3720 return 1; 3721 3722 if ((expire && now >= expire) || (change && now >= change)) 3723 return 2; /* check if expired */ 3724 3725 return 0; /* OK! */ 3726 } 3727 3728 char * 3729 ftpd_strdup(const char *s) 3730 { 3731 char *new = strdup(s); 3732 3733 if (new == NULL) 3734 fatal("Local resource failure: malloc"); 3735 /* NOTREACHED */ 3736 return (new); 3737 } 3738 3739 /* 3740 * As per fprintf(), but increment total_bytes and total_bytes_out, 3741 * by the appropriate amount. 3742 */ 3743 void 3744 cprintf(FILE *fd, const char *fmt, ...) 3745 { 3746 off_t b; 3747 va_list ap; 3748 3749 va_start(ap, fmt); 3750 b = vfprintf(fd, fmt, ap); 3751 va_end(ap); 3752 total_bytes += b; 3753 total_bytes_out += b; 3754 } 3755 3756 #ifdef USE_PAM 3757 /* 3758 * the following code is stolen from imap-uw PAM authentication module and 3759 * login.c 3760 */ 3761 typedef struct { 3762 const char *uname; /* user name */ 3763 int triedonce; /* if non-zero, tried before */ 3764 } ftpd_cred_t; 3765 3766 static int 3767 auth_conv(int num_msg, const struct pam_message **msg, 3768 struct pam_response **resp, void *appdata) 3769 { 3770 int i, ret; 3771 size_t n; 3772 ftpd_cred_t *cred = (ftpd_cred_t *) appdata; 3773 struct pam_response *myreply; 3774 char pbuf[FTP_BUFLEN]; 3775 3776 if (num_msg <= 0 || num_msg > PAM_MAX_NUM_MSG) 3777 return (PAM_CONV_ERR); 3778 myreply = calloc(num_msg, sizeof *myreply); 3779 if (myreply == NULL) 3780 return PAM_BUF_ERR; 3781 3782 for (i = 0; i < num_msg; i++) { 3783 myreply[i].resp_retcode = 0; 3784 myreply[i].resp = NULL; 3785 switch (msg[i]->msg_style) { 3786 case PAM_PROMPT_ECHO_ON: /* user */ 3787 myreply[i].resp = ftpd_strdup(cred->uname); 3788 /* PAM frees resp. */ 3789 break; 3790 case PAM_PROMPT_ECHO_OFF: /* authtok (password) */ 3791 /* 3792 * Only send a single 331 reply and 3793 * then expect a PASS. 3794 */ 3795 if (cred->triedonce) { 3796 syslog(LOG_ERR, 3797 "auth_conv: already performed PAM_PROMPT_ECHO_OFF"); 3798 goto fail; 3799 } 3800 cred->triedonce++; 3801 if (msg[i]->msg[0] == '\0') { 3802 (void)strlcpy(pbuf, "password", sizeof(pbuf)); 3803 } else { 3804 /* Uncapitalize msg */ 3805 (void)strlcpy(pbuf, msg[i]->msg, sizeof(pbuf)); 3806 if (isupper((unsigned char)pbuf[0])) 3807 pbuf[0] = tolower( 3808 (unsigned char)pbuf[0]); 3809 /* Remove trailing ':' and whitespace */ 3810 n = strlen(pbuf); 3811 while (n-- > 0) { 3812 if (isspace((unsigned char)pbuf[n]) || 3813 pbuf[n] == ':') 3814 pbuf[n] = '\0'; 3815 else 3816 break; 3817 } 3818 } 3819 /* Send reply, wait for a response. */ 3820 reply(331, "User %s accepted, provide %s.", 3821 cred->uname, pbuf); 3822 (void) alarm(curclass.timeout); 3823 ret = get_line(pbuf, sizeof(pbuf)-1, stdin); 3824 (void) alarm(0); 3825 if (ret == -1) { 3826 reply(221, "You could at least say goodbye."); 3827 dologout(0); 3828 } else if (ret == -2) { 3829 /* XXX: should we do this reply(-530, ..) ? */ 3830 reply(-530, "Command too long."); 3831 goto fail; 3832 } 3833 /* Ensure it is PASS */ 3834 if (strncasecmp(pbuf, "PASS ", 5) != 0) { 3835 syslog(LOG_ERR, 3836 "auth_conv: unexpected reply '%.4s'", pbuf); 3837 /* XXX: should we do this reply(-530, ..) ? */ 3838 reply(-530, "Unexpected reply '%.4s'.", pbuf); 3839 goto fail; 3840 } 3841 /* Strip CRLF from "PASS" reply */ 3842 n = strlen(pbuf); 3843 while (--n >= 5 && 3844 (pbuf[n] == '\r' || pbuf[n] == '\n')) 3845 pbuf[n] = '\0'; 3846 /* Copy password into reply */ 3847 myreply[i].resp = ftpd_strdup(pbuf+5); 3848 /* PAM frees resp. */ 3849 break; 3850 case PAM_TEXT_INFO: 3851 case PAM_ERROR_MSG: 3852 break; 3853 default: /* unknown message style */ 3854 goto fail; 3855 } 3856 } 3857 3858 *resp = myreply; 3859 return PAM_SUCCESS; 3860 3861 fail: 3862 free(myreply); 3863 *resp = NULL; 3864 return PAM_CONV_ERR; 3865 } 3866 3867 /* 3868 * Attempt to authenticate the user using PAM. Returns 0 if the user is 3869 * authenticated, or 1 if not authenticated. If some sort of PAM system 3870 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 3871 * function returns -1. This can be used as an indication that we should 3872 * fall back to a different authentication mechanism. 3873 * pw maybe be updated to a new user if PAM_USER changes from curname. 3874 */ 3875 static int 3876 auth_pam(void) 3877 { 3878 const char *tmpl_user; 3879 const void *item; 3880 int rval; 3881 int e; 3882 ftpd_cred_t auth_cred = { curname, 0 }; 3883 struct pam_conv conv = { &auth_conv, &auth_cred }; 3884 3885 e = pam_start("ftpd", curname, &conv, &pamh); 3886 if (e != PAM_SUCCESS) { 3887 /* 3888 * In OpenPAM, it's OK to pass NULL to pam_strerror() 3889 * if context creation has failed in the first place. 3890 */ 3891 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 3892 return -1; 3893 } 3894 3895 e = pam_set_item(pamh, PAM_RHOST, remotehost); 3896 if (e != PAM_SUCCESS) { 3897 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 3898 pam_strerror(pamh, e)); 3899 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3900 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3901 } 3902 pamh = NULL; 3903 return -1; 3904 } 3905 3906 e = pam_set_item(pamh, PAM_SOCKADDR, &his_addr); 3907 if (e != PAM_SUCCESS) { 3908 syslog(LOG_ERR, "pam_set_item(PAM_SOCKADDR): %s", 3909 pam_strerror(pamh, e)); 3910 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3911 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3912 } 3913 pamh = NULL; 3914 return -1; 3915 } 3916 3917 e = pam_authenticate(pamh, 0); 3918 if (ftpd_debug) 3919 syslog(LOG_DEBUG, "pam_authenticate: user '%s' returned %d", 3920 curname, e); 3921 switch (e) { 3922 case PAM_SUCCESS: 3923 /* 3924 * With PAM we support the concept of a "template" 3925 * user. The user enters a login name which is 3926 * authenticated by PAM, usually via a remote service 3927 * such as RADIUS or TACACS+. If authentication 3928 * succeeds, a different but related "template" name 3929 * is used for setting the credentials, shell, and 3930 * home directory. The name the user enters need only 3931 * exist on the remote authentication server, but the 3932 * template name must be present in the local password 3933 * database. 3934 * 3935 * This is supported by two various mechanisms in the 3936 * individual modules. However, from the application's 3937 * point of view, the template user is always passed 3938 * back as a changed value of the PAM_USER item. 3939 */ 3940 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 3941 PAM_SUCCESS) { 3942 tmpl_user = (const char *) item; 3943 if (pw == NULL 3944 || strcmp(pw->pw_name, tmpl_user) != 0) { 3945 pw = sgetpwnam(tmpl_user); 3946 if (ftpd_debug) 3947 syslog(LOG_DEBUG, 3948 "auth_pam: PAM changed " 3949 "user from '%s' to '%s'", 3950 curname, pw->pw_name); 3951 (void)strlcpy(curname, pw->pw_name, 3952 curname_len); 3953 } 3954 } else 3955 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 3956 pam_strerror(pamh, e)); 3957 rval = 0; 3958 break; 3959 3960 case PAM_AUTH_ERR: 3961 case PAM_USER_UNKNOWN: 3962 case PAM_MAXTRIES: 3963 rval = 1; 3964 break; 3965 3966 default: 3967 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 3968 rval = -1; 3969 break; 3970 } 3971 3972 if (rval == 0) { 3973 e = pam_acct_mgmt(pamh, 0); 3974 if (e != PAM_SUCCESS) { 3975 syslog(LOG_ERR, "pam_acct_mgmt: %s", 3976 pam_strerror(pamh, e)); 3977 rval = 1; 3978 } 3979 } 3980 3981 if (rval != 0) { 3982 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3983 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3984 } 3985 pamh = NULL; 3986 } 3987 return rval; 3988 } 3989 3990 #endif /* USE_PAM */ 3991
Indexes created Tue Oct 14 01:09:49 GMT 2025