ftpd.c revision 1.186
1 /* $NetBSD: ftpd.c,v 1.186 2008/07/20 01:09:07 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2008 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 1.186 2008/07/20 01:09:07 lukem Exp $"); 101 #endif 102 #endif /* not lint */ 103 104 /* 105 * FTP server. 106 */ 107 #include <sys/param.h> 108 #include <sys/stat.h> 109 #include <sys/ioctl.h> 110 #include <sys/socket.h> 111 #include <sys/wait.h> 112 #include <sys/mman.h> 113 #include <sys/resource.h> 114 115 #include <netinet/in.h> 116 #include <netinet/in_systm.h> 117 #include <netinet/ip.h> 118 119 #define FTP_NAMES 120 #include <arpa/ftp.h> 121 #include <arpa/inet.h> 122 #include <arpa/telnet.h> 123 124 #include <ctype.h> 125 #include <dirent.h> 126 #include <err.h> 127 #include <errno.h> 128 #include <fcntl.h> 129 #include <fnmatch.h> 130 #include <glob.h> 131 #include <grp.h> 132 #include <limits.h> 133 #include <netdb.h> 134 #include <pwd.h> 135 #include <poll.h> 136 #include <signal.h> 137 #include <stdarg.h> 138 #include <stdio.h> 139 #include <stdlib.h> 140 #include <string.h> 141 #include <syslog.h> 142 #include <time.h> 143 #include <tzfile.h> 144 #include <unistd.h> 145 #include <util.h> 146 #ifdef SUPPORT_UTMP 147 #include <utmp.h> 148 #endif 149 #ifdef SUPPORT_UTMPX 150 #include <utmpx.h> 151 #endif 152 #ifdef SKEY 153 #include <skey.h> 154 #endif 155 #ifdef KERBEROS5 156 #include <com_err.h> 157 #include <krb5/krb5.h> 158 #endif 159 160 #ifdef LOGIN_CAP 161 #include <login_cap.h> 162 #endif 163 164 #ifdef USE_PAM 165 #include <security/pam_appl.h> 166 #endif 167 168 #define GLOBAL 169 #include "extern.h" 170 #include "pathnames.h" 171 #include "version.h" 172 173 static sig_atomic_t transflag; 174 static sig_atomic_t urgflag; 175 176 int data; 177 int Dflag; 178 int sflag; 179 int stru; /* avoid C keyword */ 180 int mode; 181 int dataport; /* use specific data port */ 182 int dopidfile; /* maintain pid file */ 183 int doutmp; /* update utmp file */ 184 int dowtmp; /* update wtmp file */ 185 int doxferlog; /* syslog/write wu-ftpd style xferlog entries */ 186 int xferlogfd; /* fd to write wu-ftpd xferlog entries to */ 187 int getnameopts; /* flags for use with getname() */ 188 int dropprivs; /* if privileges should or have been dropped */ 189 int mapped; /* IPv4 connection on AF_INET6 socket */ 190 off_t file_size; 191 off_t byte_count; 192 static char ttyline[20]; 193 194 #ifdef USE_PAM 195 static int auth_pam(void); 196 pam_handle_t *pamh = NULL; 197 #endif 198 199 #ifdef SUPPORT_UTMP 200 static struct utmp utmp; /* for utmp */ 201 #endif 202 #ifdef SUPPORT_UTMPX 203 static struct utmpx utmpx; /* for utmpx */ 204 #endif 205 206 static const char *anondir = NULL; 207 static const char *confdir = _DEFAULT_CONFDIR; 208 209 static char *curname; /* current USER name */ 210 static size_t curname_len; /* length of curname (include NUL) */ 211 212 #if defined(KERBEROS) || defined(KERBEROS5) 213 int has_ccache = 0; 214 int notickets = 1; 215 char *krbtkfile_env = NULL; 216 char *tty = ttyline; 217 int login_krb5_forwardable_tgt = 0; 218 #endif 219 220 int epsvall = 0; 221 222 /* 223 * Timeout intervals for retrying connections 224 * to hosts that don't accept PORT cmds. This 225 * is a kludge, but given the problems with TCP... 226 */ 227 #define SWAITMAX 90 /* wait at most 90 seconds */ 228 #define SWAITINT 5 /* interval between retries */ 229 230 int swaitmax = SWAITMAX; 231 int swaitint = SWAITINT; 232 233 enum send_status { 234 SS_SUCCESS, 235 SS_ABORTED, /* transfer aborted */ 236 SS_NO_TRANSFER, /* no transfer made yet */ 237 SS_FILE_ERROR, /* file read error */ 238 SS_DATA_ERROR /* data send error */ 239 }; 240 241 static int bind_pasv_addr(void); 242 static int checkuser(const char *, const char *, int, int, char **); 243 static int checkaccess(const char *); 244 static int checkpassword(const struct passwd *, const char *); 245 static void do_pass(int, int, const char *); 246 static void end_login(void); 247 static FILE *getdatasock(const char *); 248 static char *gunique(const char *); 249 static void login_utmp(const char *, const char *, const char *, 250 struct sockinet *); 251 static void logremotehost(struct sockinet *); 252 static void lostconn(int); 253 static void toolong(int); 254 static void sigquit(int); 255 static void sigurg(int); 256 static int handleoobcmd(void); 257 static int receive_data(FILE *, FILE *); 258 static int send_data(FILE *, FILE *, const struct stat *, int); 259 static struct passwd *sgetpwnam(const char *); 260 static int write_data(int, char *, size_t, off_t *, struct timeval *, 261 int); 262 static enum send_status 263 send_data_with_read(int, int, const struct stat *, int); 264 static enum send_status 265 send_data_with_mmap(int, int, const struct stat *, int); 266 static void logrusage(const struct rusage *, const struct rusage *); 267 static void logout_utmp(void); 268 269 int main(int, char *[]); 270 271 #if defined(KERBEROS) 272 int klogin(struct passwd *, char *, char *, char *); 273 void kdestroy(void); 274 #endif 275 #if defined(KERBEROS5) 276 int k5login(struct passwd *, char *, char *, char *); 277 void k5destroy(void); 278 #endif 279 280 int 281 main(int argc, char *argv[]) 282 { 283 int ch, on = 1, tos, keepalive; 284 socklen_t addrlen; 285 #ifdef KERBEROS5 286 krb5_error_code kerror; 287 #endif 288 char *p; 289 const char *xferlogname = NULL; 290 long l; 291 struct sigaction sa; 292 sa_family_t af = AF_UNSPEC; 293 294 connections = 1; 295 ftpd_debug = 0; 296 logging = 0; 297 pdata = -1; 298 Dflag = 0; 299 sflag = 0; 300 dataport = 0; 301 dopidfile = 1; /* default: DO use a pid file to count users */ 302 doutmp = 0; /* default: Do NOT log to utmp */ 303 dowtmp = 1; /* default: DO log to wtmp */ 304 doxferlog = 0; /* default: Do NOT syslog xferlog */ 305 xferlogfd = -1; /* default: Do NOT write xferlog file */ 306 getnameopts = 0; /* default: xlate addrs to name */ 307 dropprivs = 0; 308 mapped = 0; 309 usedefault = 1; 310 emailaddr = NULL; 311 hostname[0] = '\0'; 312 homedir[0] = '\0'; 313 gidcount = 0; 314 is_oob = 0; 315 version = FTPD_VERSION; 316 317 /* 318 * LOG_NDELAY sets up the logging connection immediately, 319 * necessary for anonymous ftp's that chroot and can't do it later. 320 */ 321 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 322 323 while ((ch = getopt(argc, argv, 324 "46a:c:C:Dde:h:HlL:nP:qQrst:T:uUvV:wWX")) != -1) { 325 switch (ch) { 326 case '4': 327 af = AF_INET; 328 break; 329 330 case '6': 331 af = AF_INET6; 332 break; 333 334 case 'a': 335 anondir = optarg; 336 break; 337 338 case 'c': 339 confdir = optarg; 340 break; 341 342 case 'C': 343 pw = sgetpwnam(optarg); 344 exit(checkaccess(optarg) ? 0 : 1); 345 /* NOTREACHED */ 346 347 case 'D': 348 Dflag = 1; 349 break; 350 351 case 'd': 352 case 'v': /* deprecated */ 353 ftpd_debug = 1; 354 break; 355 356 case 'e': 357 emailaddr = optarg; 358 break; 359 360 case 'h': 361 strlcpy(hostname, optarg, sizeof(hostname)); 362 break; 363 364 case 'H': 365 if (gethostname(hostname, sizeof(hostname)) == -1) 366 hostname[0] = '\0'; 367 hostname[sizeof(hostname) - 1] = '\0'; 368 break; 369 370 case 'l': 371 logging++; /* > 1 == extra logging */ 372 break; 373 374 case 'L': 375 xferlogname = optarg; 376 break; 377 378 case 'n': 379 getnameopts = NI_NUMERICHOST; 380 break; 381 382 case 'P': 383 errno = 0; 384 p = NULL; 385 l = strtol(optarg, &p, 10); 386 if (errno || *optarg == '\0' || *p != '\0' || 387 l < IPPORT_RESERVED || 388 l > IPPORT_ANONMAX) { 389 syslog(LOG_WARNING, "Invalid dataport %s", 390 optarg); 391 dataport = 0; 392 } 393 dataport = (int)l; 394 break; 395 396 case 'q': 397 dopidfile = 1; 398 break; 399 400 case 'Q': 401 dopidfile = 0; 402 break; 403 404 case 'r': 405 dropprivs = 1; 406 break; 407 408 case 's': 409 sflag = 1; 410 break; 411 412 case 't': 413 case 'T': 414 syslog(LOG_WARNING, 415 "-%c has been deprecated in favour of ftpd.conf", 416 ch); 417 break; 418 419 case 'u': 420 doutmp = 1; 421 break; 422 423 case 'U': 424 doutmp = 0; 425 break; 426 427 case 'V': 428 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 429 version = NULL; 430 else 431 version = ftpd_strdup(optarg); 432 break; 433 434 case 'w': 435 dowtmp = 1; 436 break; 437 438 case 'W': 439 dowtmp = 0; 440 break; 441 442 case 'X': 443 doxferlog |= 1; 444 break; 445 446 default: 447 if (optopt == 'a' || optopt == 'C') 448 exit(1); 449 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 450 break; 451 } 452 } 453 if (EMPTYSTR(confdir)) 454 confdir = _DEFAULT_CONFDIR; 455 456 if (dowtmp) { 457 #ifdef SUPPORT_UTMPX 458 ftpd_initwtmpx(); 459 #endif 460 #ifdef SUPPORT_UTMP 461 ftpd_initwtmp(); 462 #endif 463 } 464 errno = 0; 465 l = sysconf(_SC_LOGIN_NAME_MAX); 466 if (l == -1 && errno != 0) { 467 syslog(LOG_ERR, "sysconf _SC_LOGIN_NAME_MAX: %m"); 468 exit(1); 469 } else if (l <= 0) { 470 syslog(LOG_WARNING, "using conservative LOGIN_NAME_MAX value"); 471 curname_len = _POSIX_LOGIN_NAME_MAX; 472 } else 473 curname_len = (size_t)l; 474 curname = malloc(curname_len); 475 if (curname == NULL) { 476 syslog(LOG_ERR, "malloc: %m"); 477 exit(1); 478 } 479 curname[0] = '\0'; 480 481 if (Dflag) { 482 int error, fd, i, n, *socks; 483 struct pollfd *fds; 484 struct addrinfo hints, *res, *res0; 485 486 if (daemon(1, 0) == -1) { 487 syslog(LOG_ERR, "failed to daemonize: %m"); 488 exit(1); 489 } 490 (void)memset(&sa, 0, sizeof(sa)); 491 sa.sa_handler = SIG_IGN; 492 sa.sa_flags = SA_NOCLDWAIT; 493 sigemptyset(&sa.sa_mask); 494 (void)sigaction(SIGCHLD, &sa, NULL); 495 496 (void)memset(&hints, 0, sizeof(hints)); 497 hints.ai_flags = AI_PASSIVE; 498 hints.ai_family = af; 499 hints.ai_socktype = SOCK_STREAM; 500 error = getaddrinfo(NULL, "ftp", &hints, &res0); 501 if (error) { 502 syslog(LOG_ERR, "getaddrinfo: %s", gai_strerror(error)); 503 exit(1); 504 } 505 506 for (n = 0, res = res0; res != NULL; res = res->ai_next) 507 n++; 508 if (n == 0) { 509 syslog(LOG_ERR, "no addresses available"); 510 exit(1); 511 } 512 socks = malloc(n * sizeof(int)); 513 fds = malloc(n * sizeof(struct pollfd)); 514 if (socks == NULL || fds == NULL) { 515 syslog(LOG_ERR, "malloc: %m"); 516 exit(1); 517 } 518 519 for (n = 0, res = res0; res != NULL; res = res->ai_next) { 520 socks[n] = socket(res->ai_family, res->ai_socktype, 521 res->ai_protocol); 522 if (socks[n] == -1) 523 continue; 524 (void)setsockopt(socks[n], SOL_SOCKET, SO_REUSEADDR, 525 &on, sizeof(on)); 526 if (bind(socks[n], res->ai_addr, res->ai_addrlen) 527 == -1) { 528 (void)close(socks[n]); 529 continue; 530 } 531 if (listen(socks[n], 12) == -1) { 532 (void)close(socks[n]); 533 continue; 534 } 535 536 fds[n].fd = socks[n]; 537 fds[n].events = POLLIN; 538 n++; 539 } 540 if (n == 0) { 541 syslog(LOG_ERR, "%m"); 542 exit(1); 543 } 544 freeaddrinfo(res0); 545 546 if (pidfile(NULL) == -1) 547 syslog(LOG_ERR, "failed to write a pid file: %m"); 548 549 for (;;) { 550 if (poll(fds, n, INFTIM) == -1) { 551 if (errno == EINTR) 552 continue; 553 syslog(LOG_ERR, "poll: %m"); 554 exit(1); 555 } 556 for (i = 0; i < n; i++) { 557 if (fds[i].revents & POLLIN) { 558 fd = accept(fds[i].fd, NULL, NULL); 559 if (fd == -1) { 560 syslog(LOG_ERR, "accept: %m"); 561 continue; 562 } 563 switch (fork()) { 564 case -1: 565 syslog(LOG_ERR, "fork: %m"); 566 break; 567 case 0: 568 goto child; 569 /* NOTREACHED */ 570 } 571 (void)close(fd); 572 } 573 } 574 } 575 child: 576 (void)dup2(fd, STDIN_FILENO); 577 (void)dup2(fd, STDOUT_FILENO); 578 (void)dup2(fd, STDERR_FILENO); 579 for (i = 0; i < n; i++) 580 (void)close(socks[i]); 581 } 582 583 memset((char *)&his_addr, 0, sizeof(his_addr)); 584 addrlen = sizeof(his_addr.si_su); 585 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 586 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 587 exit(1); 588 } 589 his_addr.su_len = addrlen; 590 memset((char *)&ctrl_addr, 0, sizeof(ctrl_addr)); 591 addrlen = sizeof(ctrl_addr.si_su); 592 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 593 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 594 exit(1); 595 } 596 ctrl_addr.su_len = addrlen; 597 #ifdef INET6 598 if (his_addr.su_family == AF_INET6 599 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 600 #if 1 601 /* 602 * IPv4 control connection arrived to AF_INET6 socket. 603 * I hate to do this, but this is the easiest solution. 604 * 605 * The assumption is untrue on SIIT environment. 606 */ 607 struct sockinet tmp_addr; 608 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 609 610 tmp_addr = his_addr; 611 memset(&his_addr, 0, sizeof(his_addr)); 612 his_addr.su_family = AF_INET; 613 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 614 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 615 sizeof(his_addr.su_addr)); 616 his_addr.su_port = tmp_addr.su_port; 617 618 tmp_addr = ctrl_addr; 619 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 620 ctrl_addr.su_family = AF_INET; 621 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 622 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 623 sizeof(ctrl_addr.su_addr)); 624 ctrl_addr.su_port = tmp_addr.su_port; 625 #else 626 while (fgets(line, sizeof(line), fd) != NULL) { 627 if ((cp = strchr(line, '\n')) != NULL) 628 *cp = '\0'; 629 reply(-530, "%s", line); 630 } 631 (void) fflush(stdout); 632 (void) fclose(fd); 633 reply(530, 634 "Connection from IPv4 mapped address is not supported."); 635 exit(0); 636 #endif 637 638 mapped = 1; 639 } else 640 #endif /* INET6 */ 641 mapped = 0; 642 #ifdef IP_TOS 643 if (!mapped && his_addr.su_family == AF_INET) { 644 tos = IPTOS_LOWDELAY; 645 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 646 sizeof(int)) < 0) 647 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 648 } 649 #endif 650 /* if the hostname hasn't been given, attempt to determine it */ 651 if (hostname[0] == '\0') { 652 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 653 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 654 getnameopts) != 0) 655 (void)gethostname(hostname, sizeof(hostname)); 656 hostname[sizeof(hostname) - 1] = '\0'; 657 } 658 659 /* set this here so klogin can use it... */ 660 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 661 662 (void) freopen(_PATH_DEVNULL, "w", stderr); 663 664 memset(&sa, 0, sizeof(sa)); 665 sa.sa_handler = SIG_DFL; 666 sa.sa_flags = SA_RESTART; 667 sigemptyset(&sa.sa_mask); 668 (void) sigaction(SIGCHLD, &sa, NULL); 669 670 sa.sa_handler = sigquit; 671 sa.sa_flags = SA_RESTART; 672 sigfillset(&sa.sa_mask); /* block all sigs in these handlers */ 673 (void) sigaction(SIGHUP, &sa, NULL); 674 (void) sigaction(SIGINT, &sa, NULL); 675 (void) sigaction(SIGQUIT, &sa, NULL); 676 (void) sigaction(SIGTERM, &sa, NULL); 677 sa.sa_handler = lostconn; 678 (void) sigaction(SIGPIPE, &sa, NULL); 679 sa.sa_handler = toolong; 680 (void) sigaction(SIGALRM, &sa, NULL); 681 sa.sa_handler = sigurg; 682 (void) sigaction(SIGURG, &sa, NULL); 683 684 /* Try to handle urgent data inline */ 685 #ifdef SO_OOBINLINE 686 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 687 syslog(LOG_WARNING, "setsockopt: %m"); 688 #endif 689 /* Set keepalives on the socket to detect dropped connections. */ 690 #ifdef SO_KEEPALIVE 691 keepalive = 1; 692 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 693 sizeof(int)) < 0) 694 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 695 #endif 696 697 #ifdef F_SETOWN 698 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 699 syslog(LOG_WARNING, "fcntl F_SETOWN: %m"); 700 #endif 701 logremotehost(&his_addr); 702 /* 703 * Set up default state 704 */ 705 data = -1; 706 type = TYPE_A; 707 form = FORM_N; 708 stru = STRU_F; 709 mode = MODE_S; 710 tmpline[0] = '\0'; 711 hasyyerrored = 0; 712 713 #ifdef KERBEROS5 714 kerror = krb5_init_context(&kcontext); 715 if (kerror) { 716 syslog(LOG_ERR, "%s when initializing Kerberos context", 717 error_message(kerror)); 718 exit(0); 719 } 720 #endif /* KERBEROS5 */ 721 722 init_curclass(); 723 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 724 curclass.type = CLASS_REAL; 725 726 /* If logins are disabled, print out the message. */ 727 if (display_file(_PATH_NOLOGIN, 530)) { 728 reply(530, "System not available."); 729 exit(0); 730 } 731 (void)display_file(conffilename(_NAME_FTPWELCOME), 220); 732 /* reply(220,) must follow */ 733 if (EMPTYSTR(version)) 734 reply(220, "%s FTP server ready.", hostname); 735 else 736 reply(220, "%s FTP server (%s) ready.", hostname, version); 737 738 if (xferlogname != NULL) { 739 xferlogfd = open(xferlogname, O_WRONLY | O_APPEND | O_CREAT, 740 0660); 741 if (xferlogfd == -1) 742 syslog(LOG_WARNING, "open xferlog `%s': %m", 743 xferlogname); 744 else 745 doxferlog |= 2; 746 } 747 748 ftp_loop(); 749 /* NOTREACHED */ 750 } 751 752 static void 753 lostconn(int signo __unused) 754 { 755 756 if (ftpd_debug) 757 syslog(LOG_DEBUG, "lost connection"); 758 dologout(1); 759 } 760 761 static void 762 toolong(int signo __unused) 763 { 764 765 /* XXXSIGRACE */ 766 reply(421, 767 "Timeout (" LLF " seconds): closing control connection.", 768 (LLT)curclass.timeout); 769 if (logging) 770 syslog(LOG_INFO, "User %s timed out after " LLF " seconds", 771 (pw ? pw->pw_name : "unknown"), (LLT)curclass.timeout); 772 dologout(1); 773 } 774 775 static void 776 sigquit(int signo) 777 { 778 779 if (ftpd_debug) 780 syslog(LOG_DEBUG, "got signal %d", signo); 781 dologout(1); 782 } 783 784 static void 785 sigurg(int signo __unused) 786 { 787 788 urgflag = 1; 789 } 790 791 792 /* 793 * Save the result of a getpwnam. Used for USER command, since 794 * the data returned must not be clobbered by any other command 795 * (e.g., globbing). 796 */ 797 static struct passwd * 798 sgetpwnam(const char *name) 799 { 800 static struct passwd save; 801 struct passwd *p; 802 803 if ((p = getpwnam(name)) == NULL) 804 return (p); 805 if (save.pw_name) { 806 free((char *)save.pw_name); 807 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 808 free((char *)save.pw_passwd); 809 free((char *)save.pw_gecos); 810 free((char *)save.pw_dir); 811 free((char *)save.pw_shell); 812 } 813 save = *p; 814 save.pw_name = ftpd_strdup(p->pw_name); 815 save.pw_passwd = ftpd_strdup(p->pw_passwd); 816 save.pw_gecos = ftpd_strdup(p->pw_gecos); 817 save.pw_dir = ftpd_strdup(p->pw_dir); 818 save.pw_shell = ftpd_strdup(p->pw_shell); 819 return (&save); 820 } 821 822 static int login_attempts; /* number of failed login attempts */ 823 static int askpasswd; /* had USER command, ask for PASSwd */ 824 static int permitted; /* USER permitted */ 825 826 /* 827 * USER command. 828 * Sets global passwd pointer pw if named account exists and is acceptable; 829 * sets askpasswd if a PASS command is expected. If logged in previously, 830 * need to reset state. If name is "ftp" or "anonymous", the name is not in 831 * _NAME_FTPUSERS, and ftp account exists, set guest and pw, then just return. 832 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 833 * requesting login privileges. Disallow anyone who does not have a standard 834 * shell as returned by getusershell(). Disallow anyone mentioned in the file 835 * _NAME_FTPUSERS to allow people such as root and uucp to be avoided. 836 */ 837 void 838 user(const char *name) 839 { 840 char *class; 841 #ifdef LOGIN_CAP 842 login_cap_t *lc = NULL; 843 #endif 844 #ifdef USE_PAM 845 int e; 846 #endif 847 848 class = NULL; 849 if (logged_in) { 850 switch (curclass.type) { 851 case CLASS_GUEST: 852 reply(530, "Can't change user from guest login."); 853 return; 854 case CLASS_CHROOT: 855 reply(530, "Can't change user from chroot user."); 856 return; 857 case CLASS_REAL: 858 if (dropprivs) { 859 reply(530, "Can't change user."); 860 return; 861 } 862 end_login(); 863 break; 864 default: 865 abort(); 866 } 867 } 868 869 #if defined(KERBEROS) 870 kdestroy(); 871 #endif 872 #if defined(KERBEROS5) 873 k5destroy(); 874 #endif 875 876 curclass.type = CLASS_REAL; 877 askpasswd = 0; 878 permitted = 0; 879 880 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 881 /* need `pw' setup for checkaccess() and checkuser () */ 882 if ((pw = sgetpwnam("ftp")) == NULL) 883 reply(530, "User %s unknown.", name); 884 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 885 reply(530, "User %s access denied.", name); 886 else { 887 curclass.type = CLASS_GUEST; 888 askpasswd = 1; 889 reply(331, 890 "Guest login ok, type your name as password."); 891 } 892 if (!askpasswd) { 893 if (logging) 894 syslog(LOG_NOTICE, 895 "ANONYMOUS FTP LOGIN REFUSED FROM %s", 896 remotehost); 897 end_login(); 898 goto cleanup_user; 899 } 900 name = "ftp"; 901 } else 902 pw = sgetpwnam(name); 903 904 strlcpy(curname, name, curname_len); 905 906 /* check user in /etc/ftpusers, and setup class */ 907 permitted = checkuser(_NAME_FTPUSERS, curname, 1, 0, &class); 908 909 /* check user in /etc/ftpchroot */ 910 #ifdef LOGIN_CAP 911 lc = login_getpwclass(pw); 912 #endif 913 if (checkuser(_NAME_FTPCHROOT, curname, 0, 0, NULL) 914 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 915 || login_getcapbool(lc, "ftp-chroot", 0) 916 #endif 917 ) { 918 if (curclass.type == CLASS_GUEST) { 919 syslog(LOG_NOTICE, 920 "Can't change guest user to chroot class; remove entry in %s", 921 _NAME_FTPCHROOT); 922 exit(1); 923 } 924 curclass.type = CLASS_CHROOT; 925 } 926 927 /* determine default class */ 928 if (class == NULL) { 929 switch (curclass.type) { 930 case CLASS_GUEST: 931 class = ftpd_strdup("guest"); 932 break; 933 case CLASS_CHROOT: 934 class = ftpd_strdup("chroot"); 935 break; 936 case CLASS_REAL: 937 class = ftpd_strdup("real"); 938 break; 939 default: 940 syslog(LOG_ERR, "unknown curclass.type %d; aborting", 941 curclass.type); 942 abort(); 943 } 944 } 945 /* parse ftpd.conf, setting up various parameters */ 946 parse_conf(class); 947 /* if not guest user, check for valid shell */ 948 if (pw == NULL) 949 permitted = 0; 950 else { 951 const char *cp, *shell; 952 953 if ((shell = pw->pw_shell) == NULL || *shell == 0) 954 shell = _PATH_BSHELL; 955 while ((cp = getusershell()) != NULL) 956 if (strcmp(cp, shell) == 0) 957 break; 958 endusershell(); 959 if (cp == NULL && curclass.type != CLASS_GUEST) 960 permitted = 0; 961 } 962 963 /* deny quickly (after USER not PASS) if requested */ 964 if (CURCLASS_FLAGS_ISSET(denyquick) && !permitted) { 965 reply(530, "User %s may not use FTP.", curname); 966 if (logging) 967 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 968 remotehost, curname); 969 end_login(); 970 goto cleanup_user; 971 } 972 973 /* if haven't asked yet (i.e, not anon), ask now */ 974 if (!askpasswd) { 975 askpasswd = 1; 976 #ifdef USE_PAM 977 e = auth_pam(); /* this does reply(331, ...) */ 978 do_pass(1, e, ""); 979 goto cleanup_user; 980 #else /* !USE_PAM */ 981 #ifdef SKEY 982 if (skey_haskey(curname) == 0) { 983 const char *myskey; 984 985 myskey = skey_keyinfo(curname); 986 reply(331, "Password [ %s ] required for %s.", 987 myskey ? myskey : "error getting challenge", 988 curname); 989 } else 990 #endif 991 reply(331, "Password required for %s.", curname); 992 #endif /* !USE_PAM */ 993 } 994 995 cleanup_user: 996 #ifdef LOGIN_CAP 997 login_close(lc); 998 #endif 999 /* 1000 * Delay before reading passwd after first failed 1001 * attempt to slow down passwd-guessing programs. 1002 */ 1003 if (login_attempts) 1004 sleep((unsigned) login_attempts); 1005 1006 if (class) 1007 free(class); 1008 } 1009 1010 /* 1011 * Determine whether something is to happen (allow access, chroot) 1012 * for a user. Each line is a shell-style glob followed by 1013 * `yes' or `no'. 1014 * 1015 * For backward compatibility, `allow' and `deny' are synonymns 1016 * for `yes' and `no', respectively. 1017 * 1018 * Each glob is matched against the username in turn, and the first 1019 * match found is used. If no match is found, the result is the 1020 * argument `def'. If a match is found but without and explicit 1021 * `yes'/`no', the result is the opposite of def. 1022 * 1023 * If the file doesn't exist at all, the result is the argument 1024 * `nofile' 1025 * 1026 * Any line starting with `#' is considered a comment and ignored. 1027 * 1028 * Returns 0 if the user is denied, or 1 if they are allowed. 1029 * 1030 * NOTE: needs struct passwd *pw setup before use. 1031 */ 1032 static int 1033 checkuser(const char *fname, const char *name, int def, int nofile, 1034 char **retclass) 1035 { 1036 FILE *fd; 1037 int retval; 1038 char *word, *perm, *class, *buf, *p; 1039 size_t len, line; 1040 1041 retval = def; 1042 if (retclass != NULL) 1043 *retclass = NULL; 1044 if ((fd = fopen(conffilename(fname), "r")) == NULL) 1045 return nofile; 1046 1047 line = 0; 1048 for (; 1049 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 1050 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 1051 free(buf), buf = NULL) { 1052 word = perm = class = NULL; 1053 p = buf; 1054 if (len < 1) 1055 continue; 1056 if (p[len - 1] == '\n') 1057 p[--len] = '\0'; 1058 if (EMPTYSTR(p)) 1059 continue; 1060 1061 NEXTWORD(p, word); 1062 NEXTWORD(p, perm); 1063 NEXTWORD(p, class); 1064 if (EMPTYSTR(word)) 1065 continue; 1066 if (!EMPTYSTR(class)) { 1067 if (strcasecmp(class, "all") == 0 || 1068 strcasecmp(class, "none") == 0) { 1069 syslog(LOG_WARNING, 1070 "%s line %d: illegal user-defined class `%s' - skipping entry", 1071 fname, (int)line, class); 1072 continue; 1073 } 1074 } 1075 1076 /* have a host specifier */ 1077 if ((p = strchr(word, '@')) != NULL) { 1078 unsigned long net, mask, addr; 1079 int bits; 1080 1081 *p++ = '\0'; 1082 /* check against network or CIDR */ 1083 if (isdigit((unsigned char)*p) && 1084 (bits = inet_net_pton(AF_INET, p, 1085 &net, sizeof(net))) != -1) { 1086 net = ntohl(net); 1087 mask = 0xffffffffU << (32 - bits); 1088 addr = ntohl(his_addr.su_addr.s_addr); 1089 if ((addr & mask) != net) 1090 continue; 1091 1092 /* check against hostname glob */ 1093 } else if (fnmatch(p, remotehost, FNM_CASEFOLD) != 0) 1094 continue; 1095 } 1096 1097 /* have a group specifier */ 1098 if ((p = strchr(word, ':')) != NULL) { 1099 gid_t *groups, *ng; 1100 int gsize, i, found; 1101 1102 if (pw == NULL) 1103 continue; /* no match for unknown user */ 1104 *p++ = '\0'; 1105 groups = NULL; 1106 gsize = 16; 1107 do { 1108 ng = realloc(groups, gsize * sizeof(gid_t)); 1109 if (ng == NULL) 1110 fatal( 1111 "Local resource failure: realloc"); 1112 groups = ng; 1113 } while (getgrouplist(pw->pw_name, pw->pw_gid, 1114 groups, &gsize) == -1); 1115 found = 0; 1116 for (i = 0; i < gsize; i++) { 1117 struct group *g; 1118 1119 if ((g = getgrgid(groups[i])) == NULL) 1120 continue; 1121 if (fnmatch(p, g->gr_name, 0) == 0) { 1122 found = 1; 1123 break; 1124 } 1125 } 1126 free(groups); 1127 if (!found) 1128 continue; 1129 } 1130 1131 /* check against username glob */ 1132 if (fnmatch(word, name, 0) != 0) 1133 continue; 1134 1135 if (perm != NULL && 1136 ((strcasecmp(perm, "allow") == 0) || 1137 (strcasecmp(perm, "yes") == 0))) 1138 retval = 1; 1139 else if (perm != NULL && 1140 ((strcasecmp(perm, "deny") == 0) || 1141 (strcasecmp(perm, "no") == 0))) 1142 retval = 0; 1143 else 1144 retval = !def; 1145 if (!EMPTYSTR(class) && retclass != NULL) 1146 *retclass = ftpd_strdup(class); 1147 free(buf); 1148 break; 1149 } 1150 (void) fclose(fd); 1151 return (retval); 1152 } 1153 1154 /* 1155 * Check if user is allowed by /etc/ftpusers 1156 * returns 1 for yes, 0 for no 1157 * 1158 * NOTE: needs struct passwd *pw setup (for checkuser()) 1159 */ 1160 static int 1161 checkaccess(const char *name) 1162 { 1163 1164 return (checkuser(_NAME_FTPUSERS, name, 1, 0, NULL)); 1165 } 1166 1167 static void 1168 login_utmp(const char *line, const char *name, const char *host, 1169 struct sockinet *haddr) 1170 { 1171 #if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP) 1172 struct timeval tv; 1173 (void)gettimeofday(&tv, NULL); 1174 #endif 1175 #ifdef SUPPORT_UTMPX 1176 if (doutmp) { 1177 (void)memset(&utmpx, 0, sizeof(utmpx)); 1178 utmpx.ut_tv = tv; 1179 utmpx.ut_pid = getpid(); 1180 utmpx.ut_id[0] = 'f'; 1181 utmpx.ut_id[1] = 't'; 1182 utmpx.ut_id[2] = 'p'; 1183 utmpx.ut_id[3] = '*'; 1184 utmpx.ut_type = USER_PROCESS; 1185 (void)strncpy(utmpx.ut_name, name, sizeof(utmpx.ut_name)); 1186 (void)strncpy(utmpx.ut_line, line, sizeof(utmpx.ut_line)); 1187 (void)strncpy(utmpx.ut_host, host, sizeof(utmpx.ut_host)); 1188 (void)memcpy(&utmpx.ut_ss, &haddr->si_su, haddr->su_len); 1189 ftpd_loginx(&utmpx); 1190 } 1191 if (dowtmp) 1192 ftpd_logwtmpx(line, name, host, haddr, 0, USER_PROCESS); 1193 #endif 1194 #ifdef SUPPORT_UTMP 1195 if (doutmp) { 1196 (void)memset(&utmp, 0, sizeof(utmp)); 1197 (void)time(&utmp.ut_time); 1198 (void)strncpy(utmp.ut_name, name, sizeof(utmp.ut_name)); 1199 (void)strncpy(utmp.ut_line, line, sizeof(utmp.ut_line)); 1200 (void)strncpy(utmp.ut_host, host, sizeof(utmp.ut_host)); 1201 ftpd_login(&utmp); 1202 } 1203 if (dowtmp) 1204 ftpd_logwtmp(line, name, host); 1205 #endif 1206 } 1207 1208 static void 1209 logout_utmp(void) 1210 { 1211 #ifdef SUPPORT_UTMPX 1212 int okwtmpx = dowtmp; 1213 #endif 1214 #ifdef SUPPORT_UTMP 1215 int okwtmp = dowtmp; 1216 #endif 1217 if (logged_in) { 1218 #ifdef SUPPORT_UTMPX 1219 if (doutmp) 1220 okwtmpx &= ftpd_logoutx(ttyline, 0, DEAD_PROCESS); 1221 if (okwtmpx) 1222 ftpd_logwtmpx(ttyline, "", "", NULL, 0, DEAD_PROCESS); 1223 #endif 1224 #ifdef SUPPORT_UTMP 1225 if (doutmp) 1226 okwtmp &= ftpd_logout(ttyline); 1227 if (okwtmp) 1228 ftpd_logwtmp(ttyline, "", ""); 1229 #endif 1230 } 1231 } 1232 1233 /* 1234 * Terminate login as previous user (if any), resetting state; 1235 * used when USER command is given or login fails. 1236 */ 1237 static void 1238 end_login(void) 1239 { 1240 #ifdef USE_PAM 1241 int e; 1242 #endif 1243 logout_utmp(); 1244 show_chdir_messages(-1); /* flush chdir cache */ 1245 if (pw != NULL && pw->pw_passwd != NULL) 1246 memset(pw->pw_passwd, 0, strlen(pw->pw_passwd)); 1247 pw = NULL; 1248 logged_in = 0; 1249 askpasswd = 0; 1250 permitted = 0; 1251 quietmessages = 0; 1252 gidcount = 0; 1253 curclass.type = CLASS_REAL; 1254 (void) seteuid((uid_t)0); 1255 #ifdef LOGIN_CAP 1256 setusercontext(NULL, getpwuid(0), 0, 1257 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1258 #endif 1259 #ifdef USE_PAM 1260 if (pamh) { 1261 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1262 syslog(LOG_ERR, "pam_setcred: %s", 1263 pam_strerror(pamh, e)); 1264 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1265 syslog(LOG_ERR, "pam_close_session: %s", 1266 pam_strerror(pamh, e)); 1267 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1268 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1269 pamh = NULL; 1270 } 1271 #endif 1272 } 1273 1274 void 1275 pass(const char *passwd) 1276 { 1277 do_pass(0, 0, passwd); 1278 } 1279 1280 /* 1281 * Perform the passwd confirmation and login. 1282 * 1283 * If pass_checked is zero, confirm passwd is correct, & ignore pass_rval. 1284 * This is the traditional PASS implementation. 1285 * 1286 * If pass_checked is non-zero, use pass_rval and ignore passwd. 1287 * This is used by auth_pam() which has already parsed PASS. 1288 * This only applies to curclass.type != CLASS_GUEST. 1289 */ 1290 static void 1291 do_pass(int pass_checked, int pass_rval, const char *passwd) 1292 { 1293 int rval; 1294 char root[MAXPATHLEN]; 1295 #ifdef LOGIN_CAP 1296 login_cap_t *lc = NULL; 1297 #endif 1298 #ifdef USE_PAM 1299 int e; 1300 #endif 1301 1302 rval = 1; 1303 1304 if (logged_in || askpasswd == 0) { 1305 reply(503, "Login with USER first."); 1306 return; 1307 } 1308 askpasswd = 0; 1309 if (curclass.type != CLASS_GUEST) { 1310 /* "ftp" is the only account allowed with no password */ 1311 if (pw == NULL) { 1312 rval = 1; /* failure below */ 1313 goto skip; 1314 } 1315 if (pass_checked) { /* password validated in user() */ 1316 rval = pass_rval; 1317 goto skip; 1318 } 1319 #ifdef USE_PAM 1320 syslog(LOG_ERR, "do_pass: USE_PAM shouldn't get here"); 1321 rval = 1; 1322 goto skip; 1323 #endif 1324 #if defined(KERBEROS) 1325 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 1326 rval = 0; 1327 goto skip; 1328 } 1329 #endif 1330 #if defined(KERBEROS5) 1331 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 1332 rval = 0; 1333 goto skip; 1334 } 1335 #endif 1336 #ifdef SKEY 1337 if (skey_haskey(pw->pw_name) == 0) { 1338 char *p; 1339 int r; 1340 1341 p = ftpd_strdup(passwd); 1342 r = skey_passcheck(pw->pw_name, p); 1343 free(p); 1344 if (r != -1) { 1345 rval = 0; 1346 goto skip; 1347 } 1348 } 1349 #endif 1350 if (!sflag) 1351 rval = checkpassword(pw, passwd); 1352 else 1353 rval = 1; 1354 1355 skip: 1356 1357 /* 1358 * If rval > 0, the user failed the authentication check 1359 * above. If rval == 0, either Kerberos or local 1360 * authentication succeeded. 1361 */ 1362 if (rval) { 1363 reply(530, "%s", rval == 2 ? "Password expired." : 1364 "Login incorrect."); 1365 if (logging) { 1366 syslog(LOG_NOTICE, 1367 "FTP LOGIN FAILED FROM %s", remotehost); 1368 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1369 "FTP LOGIN FAILED FROM %s, %s", 1370 remotehost, curname); 1371 } 1372 pw = NULL; 1373 if (login_attempts++ >= 5) { 1374 syslog(LOG_NOTICE, 1375 "repeated login failures from %s", 1376 remotehost); 1377 exit(0); 1378 } 1379 return; 1380 } 1381 } 1382 1383 /* password ok; check if anything else prevents login */ 1384 if (! permitted) { 1385 reply(530, "User %s may not use FTP.", pw->pw_name); 1386 if (logging) 1387 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 1388 remotehost, pw->pw_name); 1389 goto bad; 1390 } 1391 1392 login_attempts = 0; /* this time successful */ 1393 if (setegid((gid_t)pw->pw_gid) < 0) { 1394 reply(550, "Can't set gid."); 1395 goto bad; 1396 } 1397 #ifdef LOGIN_CAP 1398 if ((lc = login_getpwclass(pw)) != NULL) { 1399 #ifdef notyet 1400 char remote_ip[NI_MAXHOST]; 1401 1402 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1403 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1404 NI_NUMERICHOST)) 1405 *remote_ip = 0; 1406 remote_ip[sizeof(remote_ip) - 1] = 0; 1407 if (!auth_hostok(lc, remotehost, remote_ip)) { 1408 syslog(LOG_INFO|LOG_AUTH, 1409 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1410 pw->pw_name); 1411 reply(530, "Permission denied."); 1412 pw = NULL; 1413 return; 1414 } 1415 if (!auth_timeok(lc, time(NULL))) { 1416 reply(530, "Login not available right now."); 1417 pw = NULL; 1418 return; 1419 } 1420 #endif 1421 } 1422 setsid(); 1423 setusercontext(lc, pw, 0, 1424 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1425 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1426 #else 1427 (void) initgroups(pw->pw_name, pw->pw_gid); 1428 /* cache groups for cmds.c::matchgroup() */ 1429 #endif 1430 #ifdef USE_PAM 1431 if (pamh) { 1432 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1433 syslog(LOG_ERR, "pam_open_session: %s", 1434 pam_strerror(pamh, e)); 1435 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) 1436 != PAM_SUCCESS) { 1437 syslog(LOG_ERR, "pam_setcred: %s", 1438 pam_strerror(pamh, e)); 1439 } 1440 } 1441 #endif 1442 gidcount = getgroups(0, NULL); 1443 if (gidlist) 1444 free(gidlist); 1445 gidlist = malloc(gidcount * sizeof *gidlist); 1446 gidcount = getgroups(gidcount, gidlist); 1447 1448 /* open utmp/wtmp before chroot */ 1449 login_utmp(ttyline, pw->pw_name, remotehost, &his_addr); 1450 1451 logged_in = 1; 1452 1453 connections = 1; 1454 if (dopidfile) 1455 count_users(); 1456 if (curclass.limit != -1 && connections > curclass.limit) { 1457 if (! EMPTYSTR(curclass.limitfile)) 1458 (void)display_file(conffilename(curclass.limitfile), 1459 530); 1460 reply(530, 1461 "User %s access denied, connection limit of " LLF 1462 " reached.", 1463 pw->pw_name, (LLT)curclass.limit); 1464 syslog(LOG_NOTICE, 1465 "Maximum connection limit of " LLF 1466 " for class %s reached, login refused for %s", 1467 (LLT)curclass.limit, curclass.classname, pw->pw_name); 1468 goto bad; 1469 } 1470 1471 homedir[0] = '/'; 1472 switch (curclass.type) { 1473 case CLASS_GUEST: 1474 /* 1475 * We MUST do a chdir() after the chroot. Otherwise 1476 * the old current directory will be accessible as "." 1477 * outside the new root! 1478 */ 1479 format_path(root, 1480 curclass.chroot ? curclass.chroot : 1481 anondir ? anondir : 1482 pw->pw_dir); 1483 format_path(homedir, 1484 curclass.homedir ? curclass.homedir : 1485 "/"); 1486 if (EMPTYSTR(homedir)) 1487 homedir[0] = '/'; 1488 if (EMPTYSTR(root) || chroot(root) < 0) { 1489 syslog(LOG_NOTICE, 1490 "GUEST user %s: can't chroot to %s: %m", 1491 pw->pw_name, root); 1492 goto bad_guest; 1493 } 1494 if (chdir(homedir) < 0) { 1495 syslog(LOG_NOTICE, 1496 "GUEST user %s: can't chdir to %s: %m", 1497 pw->pw_name, homedir); 1498 bad_guest: 1499 reply(550, "Can't set guest privileges."); 1500 goto bad; 1501 } 1502 break; 1503 case CLASS_CHROOT: 1504 format_path(root, 1505 curclass.chroot ? curclass.chroot : 1506 pw->pw_dir); 1507 format_path(homedir, 1508 curclass.homedir ? curclass.homedir : 1509 "/"); 1510 if (EMPTYSTR(homedir)) 1511 homedir[0] = '/'; 1512 if (EMPTYSTR(root) || chroot(root) < 0) { 1513 syslog(LOG_NOTICE, 1514 "CHROOT user %s: can't chroot to %s: %m", 1515 pw->pw_name, root); 1516 goto bad_chroot; 1517 } 1518 if (chdir(homedir) < 0) { 1519 syslog(LOG_NOTICE, 1520 "CHROOT user %s: can't chdir to %s: %m", 1521 pw->pw_name, homedir); 1522 bad_chroot: 1523 reply(550, "Can't change root."); 1524 goto bad; 1525 } 1526 break; 1527 case CLASS_REAL: 1528 /* only chroot REAL if explicitly requested */ 1529 if (! EMPTYSTR(curclass.chroot)) { 1530 format_path(root, curclass.chroot); 1531 if (EMPTYSTR(root) || chroot(root) < 0) { 1532 syslog(LOG_NOTICE, 1533 "REAL user %s: can't chroot to %s: %m", 1534 pw->pw_name, root); 1535 goto bad_chroot; 1536 } 1537 } 1538 format_path(homedir, 1539 curclass.homedir ? curclass.homedir : 1540 pw->pw_dir); 1541 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1542 if (chdir("/") < 0) { 1543 syslog(LOG_NOTICE, 1544 "REAL user %s: can't chdir to %s: %m", 1545 pw->pw_name, 1546 !EMPTYSTR(homedir) ? homedir : "/"); 1547 reply(530, 1548 "User %s: can't change directory to %s.", 1549 pw->pw_name, 1550 !EMPTYSTR(homedir) ? homedir : "/"); 1551 goto bad; 1552 } else { 1553 reply(-230, 1554 "No directory! Logging in with home=/"); 1555 homedir[0] = '/'; 1556 } 1557 } 1558 break; 1559 } 1560 #ifndef LOGIN_CAP 1561 setsid(); 1562 setlogin(pw->pw_name); 1563 #endif 1564 if (dropprivs || 1565 (curclass.type != CLASS_REAL && 1566 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1567 dropprivs++; 1568 if (setgid((gid_t)pw->pw_gid) < 0) { 1569 reply(550, "Can't set gid."); 1570 goto bad; 1571 } 1572 if (setuid((uid_t)pw->pw_uid) < 0) { 1573 reply(550, "Can't set uid."); 1574 goto bad; 1575 } 1576 } else { 1577 if (seteuid((uid_t)pw->pw_uid) < 0) { 1578 reply(550, "Can't set uid."); 1579 goto bad; 1580 } 1581 } 1582 setenv("HOME", homedir, 1); 1583 1584 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1585 quietmessages = 1; 1586 1587 /* 1588 * Display a login message, if it exists. 1589 * N.B. reply(230,) must follow the message. 1590 */ 1591 if (! EMPTYSTR(curclass.motd)) 1592 (void)display_file(conffilename(curclass.motd), 230); 1593 show_chdir_messages(230); 1594 if (curclass.type == CLASS_GUEST) { 1595 char *p; 1596 1597 reply(230, "Guest login ok, access restrictions apply."); 1598 #if defined(HAVE_SETPROCTITLE) 1599 snprintf(proctitle, sizeof(proctitle), 1600 "%s: anonymous/%s", remotehost, passwd); 1601 setproctitle("%s", proctitle); 1602 #endif /* defined(HAVE_SETPROCTITLE) */ 1603 if (logging) 1604 syslog(LOG_INFO, 1605 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1606 remotehost, passwd, 1607 curclass.classname, CURCLASSTYPE); 1608 /* store guest password reply into pw_passwd */ 1609 REASSIGN(pw->pw_passwd, ftpd_strdup(passwd)); 1610 for (p = pw->pw_passwd; *p; p++) 1611 if (!isgraph((unsigned char)*p)) 1612 *p = '_'; 1613 } else { 1614 reply(230, "User %s logged in.", pw->pw_name); 1615 #if defined(HAVE_SETPROCTITLE) 1616 snprintf(proctitle, sizeof(proctitle), 1617 "%s: %s", remotehost, pw->pw_name); 1618 setproctitle("%s", proctitle); 1619 #endif /* defined(HAVE_SETPROCTITLE) */ 1620 if (logging) 1621 syslog(LOG_INFO, 1622 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1623 remotehost, pw->pw_name, 1624 curclass.classname, CURCLASSTYPE); 1625 } 1626 (void) umask(curclass.umask); 1627 #ifdef LOGIN_CAP 1628 login_close(lc); 1629 #endif 1630 return; 1631 1632 bad: 1633 #ifdef LOGIN_CAP 1634 login_close(lc); 1635 #endif 1636 /* Forget all about it... */ 1637 end_login(); 1638 } 1639 1640 void 1641 retrieve(char *argv[], const char *name) 1642 { 1643 FILE *fin, *dout; 1644 struct stat st; 1645 int (*closefunc)(FILE *) = NULL; 1646 int dolog, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1647 struct timeval start, finish, td, *tdp; 1648 struct rusage rusage_before, rusage_after; 1649 const char *dispname; 1650 char *error; 1651 1652 sendrv = closerv = stderrfd = -1; 1653 isconversion = isdata = isls = dolog = 0; 1654 tdp = NULL; 1655 dispname = name; 1656 fin = dout = NULL; 1657 error = NULL; 1658 if (argv == NULL) { /* if not running a command ... */ 1659 dolog = 1; 1660 isdata = 1; 1661 fin = fopen(name, "r"); 1662 closefunc = fclose; 1663 if (fin == NULL) /* doesn't exist?; try a conversion */ 1664 argv = do_conversion(name); 1665 if (argv != NULL) { 1666 isconversion++; 1667 syslog(LOG_DEBUG, "get command: '%s' on '%s'", 1668 argv[0], name); 1669 } 1670 } 1671 if (argv != NULL) { 1672 char temp[MAXPATHLEN]; 1673 1674 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1675 isls = 1; 1676 stderrfd = -1; 1677 } else { 1678 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1679 stderrfd = mkstemp(temp); 1680 if (stderrfd != -1) 1681 (void)unlink(temp); 1682 } 1683 dispname = argv[0]; 1684 fin = ftpd_popen(argv, "r", stderrfd); 1685 closefunc = ftpd_pclose; 1686 st.st_size = -1; 1687 st.st_blksize = BUFSIZ; 1688 } 1689 if (fin == NULL) { 1690 if (errno != 0) { 1691 perror_reply(550, dispname); 1692 if (dolog) 1693 logxfer("get", -1, name, NULL, NULL, 1694 strerror(errno)); 1695 } 1696 goto cleanupretrieve; 1697 } 1698 byte_count = -1; 1699 if (argv == NULL 1700 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1701 error = "Not a plain file"; 1702 reply(550, "%s: %s.", dispname, error); 1703 goto done; 1704 } 1705 if (restart_point) { 1706 if (type == TYPE_A) { 1707 off_t i; 1708 int c; 1709 1710 for (i = 0; i < restart_point; i++) { 1711 if ((c=getc(fin)) == EOF) { 1712 error = strerror(errno); 1713 perror_reply(550, dispname); 1714 goto done; 1715 } 1716 if (c == '\n') 1717 i++; 1718 } 1719 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1720 error = strerror(errno); 1721 perror_reply(550, dispname); 1722 goto done; 1723 } 1724 } 1725 dout = dataconn(dispname, st.st_size, "w"); 1726 if (dout == NULL) 1727 goto done; 1728 1729 (void)getrusage(RUSAGE_SELF, &rusage_before); 1730 (void)gettimeofday(&start, NULL); 1731 sendrv = send_data(fin, dout, &st, isdata); 1732 (void)gettimeofday(&finish, NULL); 1733 (void)getrusage(RUSAGE_SELF, &rusage_after); 1734 closedataconn(dout); /* close now to affect timing stats */ 1735 timersub(&finish, &start, &td); 1736 tdp = &td; 1737 done: 1738 if (dolog) { 1739 logxfer("get", byte_count, name, NULL, tdp, error); 1740 if (tdp != NULL) 1741 logrusage(&rusage_before, &rusage_after); 1742 } 1743 closerv = (*closefunc)(fin); 1744 if (sendrv == 0) { 1745 FILE *errf; 1746 struct stat sb; 1747 1748 if (!isls && argv != NULL && closerv != 0) { 1749 reply(-226, 1750 "Command returned an exit status of %d", 1751 closerv); 1752 if (isconversion) 1753 syslog(LOG_WARNING, 1754 "retrieve command: '%s' returned %d", 1755 argv[0], closerv); 1756 } 1757 if (!isls && argv != NULL && stderrfd != -1 && 1758 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1759 ((errf = fdopen(stderrfd, "r")) != NULL)) { 1760 char *cp, line[LINE_MAX]; 1761 1762 reply(-226, "Command error messages:"); 1763 rewind(errf); 1764 while (fgets(line, sizeof(line), errf) != NULL) { 1765 if ((cp = strchr(line, '\n')) != NULL) 1766 *cp = '\0'; 1767 reply(0, " %s", line); 1768 } 1769 (void) fflush(stdout); 1770 (void) fclose(errf); 1771 /* a reply(226,) must follow */ 1772 } 1773 reply(226, "Transfer complete."); 1774 } 1775 cleanupretrieve: 1776 if (stderrfd != -1) 1777 (void)close(stderrfd); 1778 if (isconversion) 1779 free(argv); 1780 } 1781 1782 void 1783 store(const char *name, const char *fmode, int unique) 1784 { 1785 FILE *fout, *din; 1786 struct stat st; 1787 int (*closefunc)(FILE *); 1788 struct timeval start, finish, td, *tdp; 1789 char *desc, *error; 1790 1791 din = NULL; 1792 desc = (*fmode == 'w') ? "put" : "append"; 1793 error = NULL; 1794 if (unique && stat(name, &st) == 0 && 1795 (name = gunique(name)) == NULL) { 1796 logxfer(desc, -1, name, NULL, NULL, 1797 "cannot create unique file"); 1798 goto cleanupstore; 1799 } 1800 1801 if (restart_point) 1802 fmode = "r+"; 1803 fout = fopen(name, fmode); 1804 closefunc = fclose; 1805 tdp = NULL; 1806 if (fout == NULL) { 1807 perror_reply(553, name); 1808 logxfer(desc, -1, name, NULL, NULL, strerror(errno)); 1809 goto cleanupstore; 1810 } 1811 byte_count = -1; 1812 if (restart_point) { 1813 if (type == TYPE_A) { 1814 off_t i; 1815 int c; 1816 1817 for (i = 0; i < restart_point; i++) { 1818 if ((c=getc(fout)) == EOF) { 1819 error = strerror(errno); 1820 perror_reply(550, name); 1821 goto done; 1822 } 1823 if (c == '\n') 1824 i++; 1825 } 1826 /* 1827 * We must do this seek to "current" position 1828 * because we are changing from reading to 1829 * writing. 1830 */ 1831 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1832 error = strerror(errno); 1833 perror_reply(550, name); 1834 goto done; 1835 } 1836 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1837 error = strerror(errno); 1838 perror_reply(550, name); 1839 goto done; 1840 } 1841 } 1842 din = dataconn(name, (off_t)-1, "r"); 1843 if (din == NULL) 1844 goto done; 1845 (void)gettimeofday(&start, NULL); 1846 if (receive_data(din, fout) == 0) { 1847 if (unique) 1848 reply(226, "Transfer complete (unique file name:%s).", 1849 name); 1850 else 1851 reply(226, "Transfer complete."); 1852 } 1853 (void)gettimeofday(&finish, NULL); 1854 closedataconn(din); /* close now to affect timing stats */ 1855 timersub(&finish, &start, &td); 1856 tdp = &td; 1857 done: 1858 logxfer(desc, byte_count, name, NULL, tdp, error); 1859 (*closefunc)(fout); 1860 cleanupstore: 1861 ; 1862 } 1863 1864 static FILE * 1865 getdatasock(const char *fmode) 1866 { 1867 int on, s, t, tries; 1868 in_port_t port; 1869 1870 on = 1; 1871 if (data >= 0) 1872 return (fdopen(data, fmode)); 1873 if (! dropprivs) 1874 (void) seteuid((uid_t)0); 1875 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1876 if (s < 0) 1877 goto bad; 1878 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1879 (char *) &on, sizeof(on)) < 0) 1880 goto bad; 1881 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1882 (char *) &on, sizeof(on)) < 0) 1883 goto bad; 1884 /* anchor socket to avoid multi-homing problems */ 1885 data_source = ctrl_addr; 1886 /* 1887 * By default source port for PORT connctions is 1888 * ctrlport-1 (see RFC959 section 5.2). 1889 * However, if privs have been dropped and that 1890 * would be < IPPORT_RESERVED, use a random port 1891 * instead. 1892 */ 1893 if (dataport) 1894 port = dataport; 1895 else 1896 port = ntohs(ctrl_addr.su_port) - 1; 1897 if (dropprivs && port < IPPORT_RESERVED) 1898 port = 0; /* use random port */ 1899 data_source.su_port = htons(port); 1900 1901 for (tries = 1; ; tries++) { 1902 if (bind(s, (struct sockaddr *)&data_source.si_su, 1903 data_source.su_len) >= 0) 1904 break; 1905 if (errno != EADDRINUSE || tries > 10) 1906 goto bad; 1907 sleep(tries); 1908 } 1909 if (! dropprivs) 1910 (void) seteuid((uid_t)pw->pw_uid); 1911 #ifdef IP_TOS 1912 if (!mapped && ctrl_addr.su_family == AF_INET) { 1913 on = IPTOS_THROUGHPUT; 1914 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1915 sizeof(int)) < 0) 1916 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1917 } 1918 #endif 1919 return (fdopen(s, fmode)); 1920 bad: 1921 /* Return the real value of errno (close may change it) */ 1922 t = errno; 1923 if (! dropprivs) 1924 (void) seteuid((uid_t)pw->pw_uid); 1925 (void) close(s); 1926 errno = t; 1927 return (NULL); 1928 } 1929 1930 FILE * 1931 dataconn(const char *name, off_t size, const char *fmode) 1932 { 1933 char sizebuf[32]; 1934 FILE *file; 1935 int retry, tos, keepalive, conerrno; 1936 1937 file_size = size; 1938 byte_count = 0; 1939 if (size != (off_t) -1) 1940 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1941 (LLT)size, PLURAL(size)); 1942 else 1943 sizebuf[0] = '\0'; 1944 if (pdata >= 0) { 1945 struct sockinet from; 1946 int s; 1947 socklen_t fromlen = sizeof(from.su_len); 1948 1949 (void) alarm(curclass.timeout); 1950 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 1951 (void) alarm(0); 1952 if (s < 0) { 1953 reply(425, "Can't open data connection."); 1954 (void) close(pdata); 1955 pdata = -1; 1956 return (NULL); 1957 } 1958 (void) close(pdata); 1959 pdata = s; 1960 switch (from.su_family) { 1961 case AF_INET: 1962 #ifdef IP_TOS 1963 if (!mapped) { 1964 tos = IPTOS_THROUGHPUT; 1965 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1966 (char *)&tos, sizeof(int)); 1967 } 1968 break; 1969 #endif 1970 } 1971 /* Set keepalives on the socket to detect dropped conns. */ 1972 #ifdef SO_KEEPALIVE 1973 keepalive = 1; 1974 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1975 (char *)&keepalive, sizeof(int)); 1976 #endif 1977 reply(150, "Opening %s mode data connection for '%s'%s.", 1978 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1979 return (fdopen(pdata, fmode)); 1980 } 1981 if (data >= 0) { 1982 reply(125, "Using existing data connection for '%s'%s.", 1983 name, sizebuf); 1984 usedefault = 1; 1985 return (fdopen(data, fmode)); 1986 } 1987 if (usedefault) 1988 data_dest = his_addr; 1989 usedefault = 1; 1990 retry = conerrno = 0; 1991 do { 1992 file = getdatasock(fmode); 1993 if (file == NULL) { 1994 char hbuf[NI_MAXHOST]; 1995 char pbuf[NI_MAXSERV]; 1996 1997 if (getnameinfo((struct sockaddr *)&data_source.si_su, 1998 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 1999 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV)) 2000 strlcpy(hbuf, "?", sizeof(hbuf)); 2001 reply(425, "Can't create data socket (%s,%s): %s.", 2002 hbuf, pbuf, strerror(errno)); 2003 return (NULL); 2004 } 2005 data = fileno(file); 2006 conerrno = 0; 2007 if (connect(data, (struct sockaddr *)&data_dest.si_su, 2008 data_dest.su_len) == 0) 2009 break; 2010 conerrno = errno; 2011 (void) fclose(file); 2012 file = NULL; 2013 data = -1; 2014 if (conerrno == EADDRINUSE) { 2015 sleep((unsigned) swaitint); 2016 retry += swaitint; 2017 } else { 2018 break; 2019 } 2020 } while (retry <= swaitmax); 2021 if (conerrno != 0) { 2022 perror_reply(425, "Can't build data connection"); 2023 return (NULL); 2024 } 2025 reply(150, "Opening %s mode data connection for '%s'%s.", 2026 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2027 return (file); 2028 } 2029 2030 void 2031 closedataconn(FILE *fd) 2032 { 2033 2034 if (fd == NULL) 2035 return; 2036 (void)fclose(fd); 2037 data = -1; 2038 if (pdata >= 0) 2039 (void)close(pdata); 2040 pdata = -1; 2041 } 2042 2043 int 2044 write_data(int fd, char *buf, size_t size, off_t *bufrem, 2045 struct timeval *then, int isdata) 2046 { 2047 struct timeval now, td; 2048 ssize_t c; 2049 2050 while (size > 0) { 2051 c = size; 2052 if (curclass.writesize) { 2053 if (curclass.writesize < c) 2054 c = curclass.writesize; 2055 } 2056 if (curclass.rateget) { 2057 if (*bufrem < c) 2058 c = *bufrem; 2059 } 2060 (void) alarm(curclass.timeout); 2061 c = write(fd, buf, c); 2062 if (c <= 0) 2063 return (1); 2064 buf += c; 2065 size -= c; 2066 byte_count += c; 2067 if (isdata) { 2068 total_data_out += c; 2069 total_data += c; 2070 } 2071 total_bytes_out += c; 2072 total_bytes += c; 2073 if (curclass.rateget) { 2074 *bufrem -= c; 2075 if (*bufrem == 0) { 2076 (void)gettimeofday(&now, NULL); 2077 timersub(&now, then, &td); 2078 if (td.tv_sec == 0) { 2079 usleep(1000000 - td.tv_usec); 2080 (void)gettimeofday(then, NULL); 2081 } else 2082 *then = now; 2083 *bufrem = curclass.rateget; 2084 } 2085 } 2086 } 2087 return (0); 2088 } 2089 2090 static enum send_status 2091 send_data_with_read(int filefd, int netfd, const struct stat *st, int isdata) 2092 { 2093 struct timeval then; 2094 off_t bufrem; 2095 size_t readsize; 2096 char *buf; 2097 int c, error; 2098 2099 if (curclass.readsize) 2100 readsize = curclass.readsize; 2101 else 2102 readsize = (size_t)st->st_blksize; 2103 if ((buf = malloc(readsize)) == NULL) { 2104 perror_reply(451, "Local resource failure: malloc"); 2105 return (SS_NO_TRANSFER); 2106 } 2107 2108 if (curclass.rateget) { 2109 bufrem = curclass.rateget; 2110 (void)gettimeofday(&then, NULL); 2111 } 2112 while (1) { 2113 (void) alarm(curclass.timeout); 2114 c = read(filefd, buf, readsize); 2115 if (c == 0) 2116 error = SS_SUCCESS; 2117 else if (c < 0) 2118 error = SS_FILE_ERROR; 2119 else if (write_data(netfd, buf, c, &bufrem, &then, isdata)) 2120 error = SS_DATA_ERROR; 2121 else if (urgflag && handleoobcmd()) 2122 error = SS_ABORTED; 2123 else 2124 continue; 2125 2126 free(buf); 2127 return (error); 2128 } 2129 } 2130 2131 static enum send_status 2132 send_data_with_mmap(int filefd, int netfd, const struct stat *st, int isdata) 2133 { 2134 struct timeval then; 2135 off_t bufrem, filesize, off, origoff; 2136 size_t mapsize, winsize; 2137 int error, sendbufsize, sendlowat; 2138 void *win; 2139 2140 if (curclass.sendbufsize) { 2141 sendbufsize = curclass.sendbufsize; 2142 if (setsockopt(netfd, SOL_SOCKET, SO_SNDBUF, 2143 &sendbufsize, sizeof(int)) == -1) 2144 syslog(LOG_WARNING, "setsockopt(SO_SNDBUF, %d): %m", 2145 sendbufsize); 2146 } 2147 2148 if (curclass.sendlowat) { 2149 sendlowat = curclass.sendlowat; 2150 if (setsockopt(netfd, SOL_SOCKET, SO_SNDLOWAT, 2151 &sendlowat, sizeof(int)) == -1) 2152 syslog(LOG_WARNING, "setsockopt(SO_SNDLOWAT, %d): %m", 2153 sendlowat); 2154 } 2155 2156 winsize = curclass.mmapsize; 2157 filesize = st->st_size; 2158 if (ftpd_debug) 2159 syslog(LOG_INFO, "mmapsize = %ld, writesize = %ld", 2160 (long)winsize, (long)curclass.writesize); 2161 if (winsize == 0) 2162 goto try_read; 2163 2164 off = lseek(filefd, (off_t)0, SEEK_CUR); 2165 if (off == -1) 2166 goto try_read; 2167 2168 origoff = off; 2169 if (curclass.rateget) { 2170 bufrem = curclass.rateget; 2171 (void)gettimeofday(&then, NULL); 2172 } 2173 while (1) { 2174 mapsize = MIN(filesize - off, winsize); 2175 if (mapsize == 0) 2176 break; 2177 win = mmap(NULL, mapsize, PROT_READ, 2178 MAP_FILE|MAP_SHARED, filefd, off); 2179 if (win == MAP_FAILED) { 2180 if (off == origoff) 2181 goto try_read; 2182 return (SS_FILE_ERROR); 2183 } 2184 (void) madvise(win, mapsize, MADV_SEQUENTIAL); 2185 error = write_data(netfd, win, mapsize, &bufrem, &then, 2186 isdata); 2187 (void) madvise(win, mapsize, MADV_DONTNEED); 2188 munmap(win, mapsize); 2189 if (urgflag && handleoobcmd()) 2190 return (SS_ABORTED); 2191 if (error) 2192 return (SS_DATA_ERROR); 2193 off += mapsize; 2194 } 2195 return (SS_SUCCESS); 2196 2197 try_read: 2198 return (send_data_with_read(filefd, netfd, st, isdata)); 2199 } 2200 2201 /* 2202 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2203 * encapsulation of the data subject to Mode, Structure, and Type. 2204 * 2205 * NB: Form isn't handled. 2206 */ 2207 static int 2208 send_data(FILE *instr, FILE *outstr, const struct stat *st, int isdata) 2209 { 2210 int c, filefd, netfd, rval; 2211 2212 urgflag = 0; 2213 transflag = 1; 2214 rval = -1; 2215 2216 switch (type) { 2217 2218 case TYPE_A: 2219 /* XXXLUKEM: rate limit ascii send (get) */ 2220 (void) alarm(curclass.timeout); 2221 while ((c = getc(instr)) != EOF) { 2222 if (urgflag && handleoobcmd()) 2223 goto cleanup_send_data; 2224 byte_count++; 2225 if (c == '\n') { 2226 if (ferror(outstr)) 2227 goto data_err; 2228 (void) putc('\r', outstr); 2229 if (isdata) { 2230 total_data_out++; 2231 total_data++; 2232 } 2233 total_bytes_out++; 2234 total_bytes++; 2235 } 2236 (void) putc(c, outstr); 2237 if (isdata) { 2238 total_data_out++; 2239 total_data++; 2240 } 2241 total_bytes_out++; 2242 total_bytes++; 2243 if ((byte_count % 4096) == 0) 2244 (void) alarm(curclass.timeout); 2245 } 2246 (void) alarm(0); 2247 fflush(outstr); 2248 if (ferror(instr)) 2249 goto file_err; 2250 if (ferror(outstr)) 2251 goto data_err; 2252 rval = 0; 2253 goto cleanup_send_data; 2254 2255 case TYPE_I: 2256 case TYPE_L: 2257 filefd = fileno(instr); 2258 netfd = fileno(outstr); 2259 switch (send_data_with_mmap(filefd, netfd, st, isdata)) { 2260 2261 case SS_SUCCESS: 2262 break; 2263 2264 case SS_ABORTED: 2265 case SS_NO_TRANSFER: 2266 goto cleanup_send_data; 2267 2268 case SS_FILE_ERROR: 2269 goto file_err; 2270 2271 case SS_DATA_ERROR: 2272 goto data_err; 2273 } 2274 rval = 0; 2275 goto cleanup_send_data; 2276 2277 default: 2278 reply(550, "Unimplemented TYPE %d in send_data", type); 2279 goto cleanup_send_data; 2280 } 2281 2282 data_err: 2283 (void) alarm(0); 2284 perror_reply(426, "Data connection"); 2285 goto cleanup_send_data; 2286 2287 file_err: 2288 (void) alarm(0); 2289 perror_reply(551, "Error on input file"); 2290 goto cleanup_send_data; 2291 2292 cleanup_send_data: 2293 (void) alarm(0); 2294 transflag = 0; 2295 urgflag = 0; 2296 if (isdata) { 2297 total_files_out++; 2298 total_files++; 2299 } 2300 total_xfers_out++; 2301 total_xfers++; 2302 return (rval); 2303 } 2304 2305 /* 2306 * Transfer data from peer to "outstr" using the appropriate encapulation of 2307 * the data subject to Mode, Structure, and Type. 2308 * 2309 * N.B.: Form isn't handled. 2310 */ 2311 static int 2312 receive_data(FILE *instr, FILE *outstr) 2313 { 2314 int c, netfd, filefd, rval; 2315 int volatile bare_lfs; 2316 off_t byteswritten; 2317 char *buf; 2318 size_t readsize; 2319 struct sigaction sa, sa_saved; 2320 struct stat st; 2321 2322 memset(&sa, 0, sizeof(sa)); 2323 sigfillset(&sa.sa_mask); 2324 sa.sa_flags = SA_RESTART; 2325 sa.sa_handler = lostconn; 2326 (void) sigaction(SIGALRM, &sa, &sa_saved); 2327 2328 bare_lfs = 0; 2329 urgflag = 0; 2330 transflag = 1; 2331 rval = -1; 2332 byteswritten = 0; 2333 buf = NULL; 2334 2335 #define FILESIZECHECK(x) \ 2336 do { \ 2337 if (curclass.maxfilesize != -1 && \ 2338 (x) > curclass.maxfilesize) { \ 2339 errno = EFBIG; \ 2340 goto file_err; \ 2341 } \ 2342 } while (0) 2343 2344 switch (type) { 2345 2346 case TYPE_I: 2347 case TYPE_L: 2348 netfd = fileno(instr); 2349 filefd = fileno(outstr); 2350 (void) alarm(curclass.timeout); 2351 if (curclass.readsize) 2352 readsize = curclass.readsize; 2353 else if (fstat(filefd, &st)) 2354 readsize = (size_t)st.st_blksize; 2355 else 2356 readsize = BUFSIZ; 2357 if ((buf = malloc(readsize)) == NULL) { 2358 perror_reply(451, "Local resource failure: malloc"); 2359 goto cleanup_recv_data; 2360 } 2361 if (curclass.rateput) { 2362 while (1) { 2363 int d; 2364 struct timeval then, now, td; 2365 off_t bufrem; 2366 2367 (void)gettimeofday(&then, NULL); 2368 errno = c = d = 0; 2369 for (bufrem = curclass.rateput; bufrem > 0; ) { 2370 if ((c = read(netfd, buf, 2371 MIN(readsize, bufrem))) <= 0) 2372 goto recvdone; 2373 if (urgflag && handleoobcmd()) 2374 goto cleanup_recv_data; 2375 FILESIZECHECK(byte_count + c); 2376 if ((d = write(filefd, buf, c)) != c) 2377 goto file_err; 2378 (void) alarm(curclass.timeout); 2379 bufrem -= c; 2380 byte_count += c; 2381 total_data_in += c; 2382 total_data += c; 2383 total_bytes_in += c; 2384 total_bytes += c; 2385 } 2386 (void)gettimeofday(&now, NULL); 2387 timersub(&now, &then, &td); 2388 if (td.tv_sec == 0) 2389 usleep(1000000 - td.tv_usec); 2390 } 2391 } else { 2392 while ((c = read(netfd, buf, readsize)) > 0) { 2393 if (urgflag && handleoobcmd()) 2394 goto cleanup_recv_data; 2395 FILESIZECHECK(byte_count + c); 2396 if (write(filefd, buf, c) != c) 2397 goto file_err; 2398 (void) alarm(curclass.timeout); 2399 byte_count += c; 2400 total_data_in += c; 2401 total_data += c; 2402 total_bytes_in += c; 2403 total_bytes += c; 2404 } 2405 } 2406 recvdone: 2407 if (c < 0) 2408 goto data_err; 2409 rval = 0; 2410 goto cleanup_recv_data; 2411 2412 case TYPE_E: 2413 reply(553, "TYPE E not implemented."); 2414 goto cleanup_recv_data; 2415 2416 case TYPE_A: 2417 (void) alarm(curclass.timeout); 2418 /* XXXLUKEM: rate limit ascii receive (put) */ 2419 while ((c = getc(instr)) != EOF) { 2420 if (urgflag && handleoobcmd()) 2421 goto cleanup_recv_data; 2422 byte_count++; 2423 total_data_in++; 2424 total_data++; 2425 total_bytes_in++; 2426 total_bytes++; 2427 if ((byte_count % 4096) == 0) 2428 (void) alarm(curclass.timeout); 2429 if (c == '\n') 2430 bare_lfs++; 2431 while (c == '\r') { 2432 if (ferror(outstr)) 2433 goto data_err; 2434 if ((c = getc(instr)) != '\n') { 2435 byte_count++; 2436 total_data_in++; 2437 total_data++; 2438 total_bytes_in++; 2439 total_bytes++; 2440 if ((byte_count % 4096) == 0) 2441 (void) alarm(curclass.timeout); 2442 byteswritten++; 2443 FILESIZECHECK(byteswritten); 2444 (void) putc ('\r', outstr); 2445 if (c == '\0' || c == EOF) 2446 goto contin2; 2447 } 2448 } 2449 byteswritten++; 2450 FILESIZECHECK(byteswritten); 2451 (void) putc(c, outstr); 2452 contin2: ; 2453 } 2454 (void) alarm(0); 2455 fflush(outstr); 2456 if (ferror(instr)) 2457 goto data_err; 2458 if (ferror(outstr)) 2459 goto file_err; 2460 if (bare_lfs) { 2461 reply(-226, 2462 "WARNING! %d bare linefeeds received in ASCII mode", 2463 bare_lfs); 2464 reply(0, "File may not have transferred correctly."); 2465 } 2466 rval = 0; 2467 goto cleanup_recv_data; 2468 2469 default: 2470 reply(550, "Unimplemented TYPE %d in receive_data", type); 2471 goto cleanup_recv_data; 2472 } 2473 #undef FILESIZECHECK 2474 2475 data_err: 2476 (void) alarm(0); 2477 perror_reply(426, "Data Connection"); 2478 goto cleanup_recv_data; 2479 2480 file_err: 2481 (void) alarm(0); 2482 perror_reply(452, "Error writing file"); 2483 goto cleanup_recv_data; 2484 2485 cleanup_recv_data: 2486 (void) alarm(0); 2487 (void) sigaction(SIGALRM, &sa_saved, NULL); 2488 if (buf) 2489 free(buf); 2490 transflag = 0; 2491 urgflag = 0; 2492 total_files_in++; 2493 total_files++; 2494 total_xfers_in++; 2495 total_xfers++; 2496 return (rval); 2497 } 2498 2499 void 2500 statcmd(void) 2501 { 2502 struct sockinet *su = NULL; 2503 static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 2504 unsigned char *a, *p; 2505 int ispassive, af; 2506 off_t otbi, otbo, otb; 2507 2508 a = p = (unsigned char *)NULL; 2509 2510 reply(-211, "%s FTP server status:", hostname); 2511 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 2512 hbuf[0] = '\0'; 2513 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 2514 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) 2515 && strcmp(remotehost, hbuf) != 0) 2516 reply(0, "Connected to %s (%s)", remotehost, hbuf); 2517 else 2518 reply(0, "Connected to %s", remotehost); 2519 2520 if (logged_in) { 2521 if (curclass.type == CLASS_GUEST) 2522 reply(0, "Logged in anonymously"); 2523 else 2524 reply(0, "Logged in as %s%s", pw->pw_name, 2525 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 2526 } else if (askpasswd) 2527 reply(0, "Waiting for password"); 2528 else 2529 reply(0, "Waiting for user name"); 2530 cprintf(stdout, " TYPE: %s", typenames[type]); 2531 if (type == TYPE_A || type == TYPE_E) 2532 cprintf(stdout, ", FORM: %s", formnames[form]); 2533 if (type == TYPE_L) { 2534 #if NBBY == 8 2535 cprintf(stdout, " %d", NBBY); 2536 #else 2537 /* XXX: `bytesize' needs to be defined in this case */ 2538 cprintf(stdout, " %d", bytesize); 2539 #endif 2540 } 2541 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 2542 strunames[stru], modenames[mode]); 2543 ispassive = 0; 2544 if (data != -1) { 2545 reply(0, "Data connection open"); 2546 su = NULL; 2547 } else if (pdata != -1) { 2548 reply(0, "in Passive mode"); 2549 if (curclass.advertise.su_len != 0) 2550 su = &curclass.advertise; 2551 else 2552 su = &pasv_addr; 2553 ispassive = 1; 2554 goto printaddr; 2555 } else if (usedefault == 0) { 2556 su = (struct sockinet *)&data_dest; 2557 2558 if (epsvall) { 2559 reply(0, "EPSV only mode (EPSV ALL)"); 2560 goto epsvonly; 2561 } 2562 printaddr: 2563 /* PASV/PORT */ 2564 if (su->su_family == AF_INET) { 2565 a = (unsigned char *) &su->su_addr; 2566 p = (unsigned char *) &su->su_port; 2567 #define UC(b) (((int) b) & 0xff) 2568 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 2569 ispassive ? "PASV" : "PORT" , 2570 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2571 UC(p[0]), UC(p[1])); 2572 } 2573 2574 /* LPSV/LPRT */ 2575 { 2576 int alen, i; 2577 2578 alen = 0; 2579 switch (su->su_family) { 2580 case AF_INET: 2581 a = (unsigned char *) &su->su_addr; 2582 p = (unsigned char *) &su->su_port; 2583 alen = sizeof(su->su_addr); 2584 af = 4; 2585 break; 2586 #ifdef INET6 2587 case AF_INET6: 2588 a = (unsigned char *) &su->su_6addr; 2589 p = (unsigned char *) &su->su_port; 2590 alen = sizeof(su->su_6addr); 2591 af = 6; 2592 break; 2593 #endif 2594 default: 2595 af = 0; 2596 break; 2597 } 2598 if (af) { 2599 cprintf(stdout, " %s (%d,%d", 2600 ispassive ? "LPSV" : "LPRT", af, alen); 2601 for (i = 0; i < alen; i++) 2602 cprintf(stdout, ",%d", UC(a[i])); 2603 cprintf(stdout, ",%d,%d,%d)\r\n", 2604 2, UC(p[0]), UC(p[1])); 2605 #undef UC 2606 } 2607 } 2608 2609 /* EPRT/EPSV */ 2610 epsvonly: 2611 af = af2epsvproto(su->su_family); 2612 hbuf[0] = '\0'; 2613 if (af > 0) { 2614 struct sockinet tmp; 2615 2616 tmp = *su; 2617 #ifdef INET6 2618 if (tmp.su_family == AF_INET6) 2619 tmp.su_scope_id = 0; 2620 #endif 2621 if (getnameinfo((struct sockaddr *)&tmp.si_su, 2622 tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 2623 NI_NUMERICHOST | NI_NUMERICSERV) == 0) 2624 reply(0, "%s (|%d|%s|%s|)", 2625 ispassive ? "EPSV" : "EPRT", 2626 af, hbuf, sbuf); 2627 } 2628 } else 2629 reply(0, "No data connection"); 2630 2631 if (logged_in) { 2632 reply(0, 2633 "Data sent: " LLF " byte%s in " LLF " file%s", 2634 (LLT)total_data_out, PLURAL(total_data_out), 2635 (LLT)total_files_out, PLURAL(total_files_out)); 2636 reply(0, 2637 "Data received: " LLF " byte%s in " LLF " file%s", 2638 (LLT)total_data_in, PLURAL(total_data_in), 2639 (LLT)total_files_in, PLURAL(total_files_in)); 2640 reply(0, 2641 "Total data: " LLF " byte%s in " LLF " file%s", 2642 (LLT)total_data, PLURAL(total_data), 2643 (LLT)total_files, PLURAL(total_files)); 2644 } 2645 otbi = total_bytes_in; 2646 otbo = total_bytes_out; 2647 otb = total_bytes; 2648 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 2649 (LLT)otbo, PLURAL(otbo), 2650 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 2651 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 2652 (LLT)otbi, PLURAL(otbi), 2653 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 2654 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 2655 (LLT)otb, PLURAL(otb), 2656 (LLT)total_xfers, PLURAL(total_xfers)); 2657 2658 if (logged_in && !CURCLASS_FLAGS_ISSET(private)) { 2659 struct ftpconv *cp; 2660 2661 reply(0, "%s", ""); 2662 reply(0, "Class: %s, type: %s", 2663 curclass.classname, CURCLASSTYPE); 2664 reply(0, "Check PORT/LPRT commands: %sabled", 2665 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 2666 if (! EMPTYSTR(curclass.display)) 2667 reply(0, "Display file: %s", curclass.display); 2668 if (! EMPTYSTR(curclass.notify)) 2669 reply(0, "Notify fileglob: %s", curclass.notify); 2670 reply(0, "Idle timeout: " LLF ", maximum timeout: " LLF, 2671 (LLT)curclass.timeout, (LLT)curclass.maxtimeout); 2672 reply(0, "Current connections: %d", connections); 2673 if (curclass.limit == -1) 2674 reply(0, "Maximum connections: unlimited"); 2675 else 2676 reply(0, "Maximum connections: " LLF, 2677 (LLT)curclass.limit); 2678 if (curclass.limitfile) 2679 reply(0, "Connection limit exceeded message file: %s", 2680 conffilename(curclass.limitfile)); 2681 if (! EMPTYSTR(curclass.chroot)) 2682 reply(0, "Chroot format: %s", curclass.chroot); 2683 reply(0, "Deny bad ftpusers(5) quickly: %sabled", 2684 CURCLASS_FLAGS_ISSET(denyquick) ? "en" : "dis"); 2685 if (! EMPTYSTR(curclass.homedir)) 2686 reply(0, "Homedir format: %s", curclass.homedir); 2687 if (curclass.maxfilesize == -1) 2688 reply(0, "Maximum file size: unlimited"); 2689 else 2690 reply(0, "Maximum file size: " LLF, 2691 (LLT)curclass.maxfilesize); 2692 if (! EMPTYSTR(curclass.motd)) 2693 reply(0, "MotD file: %s", conffilename(curclass.motd)); 2694 reply(0, 2695 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2696 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2697 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2698 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2699 reply(0, "Sanitize file names: %sabled", 2700 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2701 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2702 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2703 if (curclass.advertise.su_len != 0) { 2704 char buf[50]; /* big enough for IPv6 address */ 2705 const char *bp; 2706 2707 bp = inet_ntop(curclass.advertise.su_family, 2708 (void *)&curclass.advertise.su_addr, 2709 buf, sizeof(buf)); 2710 if (bp != NULL) 2711 reply(0, "PASV advertise address: %s", bp); 2712 } 2713 if (curclass.portmin && curclass.portmax) 2714 reply(0, "PASV port range: " LLF " - " LLF, 2715 (LLT)curclass.portmin, (LLT)curclass.portmax); 2716 if (curclass.rateget) 2717 reply(0, "Rate get limit: " LLF " bytes/sec", 2718 (LLT)curclass.rateget); 2719 else 2720 reply(0, "Rate get limit: disabled"); 2721 if (curclass.rateput) 2722 reply(0, "Rate put limit: " LLF " bytes/sec", 2723 (LLT)curclass.rateput); 2724 else 2725 reply(0, "Rate put limit: disabled"); 2726 if (curclass.mmapsize) 2727 reply(0, "Mmap size: " LLF, (LLT)curclass.mmapsize); 2728 else 2729 reply(0, "Mmap size: disabled"); 2730 if (curclass.readsize) 2731 reply(0, "Read size: " LLF, (LLT)curclass.readsize); 2732 else 2733 reply(0, "Read size: default"); 2734 if (curclass.writesize) 2735 reply(0, "Write size: " LLF, (LLT)curclass.writesize); 2736 else 2737 reply(0, "Write size: default"); 2738 if (curclass.recvbufsize) 2739 reply(0, "Receive buffer size: " LLF, 2740 (LLT)curclass.recvbufsize); 2741 else 2742 reply(0, "Receive buffer size: default"); 2743 if (curclass.sendbufsize) 2744 reply(0, "Send buffer size: " LLF, 2745 (LLT)curclass.sendbufsize); 2746 else 2747 reply(0, "Send buffer size: default"); 2748 if (curclass.sendlowat) 2749 reply(0, "Send low water mark: " LLF, 2750 (LLT)curclass.sendlowat); 2751 else 2752 reply(0, "Send low water mark: default"); 2753 reply(0, "Umask: %.04o", curclass.umask); 2754 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2755 if (cp->suffix == NULL || cp->types == NULL || 2756 cp->command == NULL) 2757 continue; 2758 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2759 cp->suffix, cp->types, cp->disable, cp->command); 2760 } 2761 } 2762 2763 reply(211, "End of status"); 2764 } 2765 2766 void 2767 fatal(const char *s) 2768 { 2769 2770 reply(451, "Error in server: %s\n", s); 2771 reply(221, "Closing connection due to server error."); 2772 dologout(0); 2773 /* NOTREACHED */ 2774 } 2775 2776 /* 2777 * reply() -- 2778 * depending on the value of n, display fmt with a trailing CRLF and 2779 * prefix of: 2780 * n < -1 prefix the message with abs(n) + "-" (initial line) 2781 * n == 0 prefix the message with 4 spaces (middle lines) 2782 * n > 0 prefix the message with n + " " (final line) 2783 */ 2784 void 2785 reply(int n, const char *fmt, ...) 2786 { 2787 char msg[MAXPATHLEN * 2 + 100]; 2788 size_t b; 2789 va_list ap; 2790 2791 b = 0; 2792 if (n == 0) 2793 b = snprintf(msg, sizeof(msg), " "); 2794 else if (n < 0) 2795 b = snprintf(msg, sizeof(msg), "%d-", -n); 2796 else 2797 b = snprintf(msg, sizeof(msg), "%d ", n); 2798 va_start(ap, fmt); 2799 vsnprintf(msg + b, sizeof(msg) - b, fmt, ap); 2800 va_end(ap); 2801 cprintf(stdout, "%s\r\n", msg); 2802 (void)fflush(stdout); 2803 if (ftpd_debug) 2804 syslog(LOG_DEBUG, "<--- %s", msg); 2805 } 2806 2807 static void 2808 logremotehost(struct sockinet *who) 2809 { 2810 2811 if (getnameinfo((struct sockaddr *)&who->si_su, 2812 who->su_len, remotehost, sizeof(remotehost), NULL, 0, 2813 getnameopts)) 2814 strlcpy(remotehost, "?", sizeof(remotehost)); 2815 2816 #if defined(HAVE_SETPROCTITLE) 2817 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2818 setproctitle("%s", proctitle); 2819 #endif /* defined(HAVE_SETPROCTITLE) */ 2820 if (logging) 2821 syslog(LOG_INFO, "connection from %s to %s", 2822 remotehost, hostname); 2823 } 2824 2825 /* 2826 * Record logout in wtmp file and exit with supplied status. 2827 * NOTE: because this is called from signal handlers it cannot 2828 * use stdio (or call other functions that use stdio). 2829 */ 2830 void 2831 dologout(int status) 2832 { 2833 /* 2834 * Prevent reception of SIGURG from resulting in a resumption 2835 * back to the main program loop. 2836 */ 2837 transflag = 0; 2838 logout_utmp(); 2839 if (logged_in) { 2840 #ifdef KERBEROS 2841 if (!notickets && krbtkfile_env) 2842 unlink(krbtkfile_env); 2843 #endif 2844 } 2845 /* beware of flushing buffers after a SIGPIPE */ 2846 if (xferlogfd != -1) 2847 close(xferlogfd); 2848 _exit(status); 2849 } 2850 2851 void 2852 abor(void) 2853 { 2854 2855 if (!transflag) 2856 return; 2857 tmpline[0] = '\0'; 2858 is_oob = 0; 2859 reply(426, "Transfer aborted. Data connection closed."); 2860 reply(226, "Abort successful"); 2861 transflag = 0; /* flag that the transfer has aborted */ 2862 } 2863 2864 void 2865 statxfer(void) 2866 { 2867 2868 if (!transflag) 2869 return; 2870 tmpline[0] = '\0'; 2871 is_oob = 0; 2872 if (file_size != (off_t) -1) 2873 reply(213, 2874 "Status: " LLF " of " LLF " byte%s transferred", 2875 (LLT)byte_count, (LLT)file_size, 2876 PLURAL(byte_count)); 2877 else 2878 reply(213, "Status: " LLF " byte%s transferred", 2879 (LLT)byte_count, PLURAL(byte_count)); 2880 } 2881 2882 /* 2883 * Call when urgflag != 0 to handle Out Of Band commands. 2884 * Returns non zero if the OOB command aborted the transfer 2885 * by setting transflag to 0. (c.f., "ABOR"). 2886 */ 2887 static int 2888 handleoobcmd() 2889 { 2890 char *cp; 2891 2892 if (!urgflag) 2893 return (0); 2894 urgflag = 0; 2895 /* only process if transfer occurring */ 2896 if (!transflag) 2897 return (0); 2898 cp = tmpline; 2899 if (getline(cp, sizeof(tmpline), stdin) == NULL) { 2900 reply(221, "You could at least say goodbye."); 2901 dologout(0); 2902 } 2903 /* 2904 * Manually parse OOB commands, because we can't 2905 * recursively call the yacc parser... 2906 */ 2907 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2908 abor(); 2909 } else if (strcasecmp(cp, "STAT\r\n") == 0) { 2910 statxfer(); 2911 } else { 2912 /* XXX: error with "500 unknown command" ? */ 2913 } 2914 return (transflag == 0); 2915 } 2916 2917 static int 2918 bind_pasv_addr(void) 2919 { 2920 static int passiveport; 2921 int port, len; 2922 2923 len = pasv_addr.su_len; 2924 if (curclass.portmin == 0 && curclass.portmax == 0) { 2925 pasv_addr.su_port = 0; 2926 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2927 } 2928 2929 if (passiveport == 0) { 2930 srand(getpid()); 2931 passiveport = rand() % (curclass.portmax - curclass.portmin) 2932 + curclass.portmin; 2933 } 2934 2935 port = passiveport; 2936 while (1) { 2937 port++; 2938 if (port > curclass.portmax) 2939 port = curclass.portmin; 2940 else if (port == passiveport) { 2941 errno = EAGAIN; 2942 return (-1); 2943 } 2944 pasv_addr.su_port = htons(port); 2945 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 2946 break; 2947 if (errno != EADDRINUSE) 2948 return (-1); 2949 } 2950 passiveport = port; 2951 return (0); 2952 } 2953 2954 /* 2955 * Note: a response of 425 is not mentioned as a possible response to 2956 * the PASV command in RFC959. However, it has been blessed as 2957 * a legitimate response by Jon Postel in a telephone conversation 2958 * with Rick Adams on 25 Jan 89. 2959 */ 2960 void 2961 passive(void) 2962 { 2963 socklen_t len, recvbufsize; 2964 char *p, *a; 2965 2966 if (pdata >= 0) 2967 close(pdata); 2968 pdata = socket(AF_INET, SOCK_STREAM, 0); 2969 if (pdata < 0 || !logged_in) { 2970 perror_reply(425, "Can't open passive connection"); 2971 return; 2972 } 2973 pasv_addr = ctrl_addr; 2974 2975 if (bind_pasv_addr() < 0) 2976 goto pasv_error; 2977 len = pasv_addr.su_len; 2978 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2979 goto pasv_error; 2980 pasv_addr.su_len = len; 2981 if (curclass.recvbufsize) { 2982 recvbufsize = curclass.recvbufsize; 2983 if (setsockopt(pdata, SOL_SOCKET, SO_RCVBUF, &recvbufsize, 2984 sizeof(int)) == -1) 2985 syslog(LOG_WARNING, "setsockopt(SO_RCVBUF, %d): %m", 2986 recvbufsize); 2987 } 2988 if (listen(pdata, 1) < 0) 2989 goto pasv_error; 2990 if (curclass.advertise.su_len != 0) 2991 a = (char *) &curclass.advertise.su_addr; 2992 else 2993 a = (char *) &pasv_addr.su_addr; 2994 p = (char *) &pasv_addr.su_port; 2995 2996 #define UC(b) (((int) b) & 0xff) 2997 2998 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2999 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 3000 return; 3001 3002 pasv_error: 3003 (void) close(pdata); 3004 pdata = -1; 3005 perror_reply(425, "Can't open passive connection"); 3006 return; 3007 } 3008 3009 /* 3010 * convert protocol identifier to/from AF 3011 */ 3012 int 3013 lpsvproto2af(int proto) 3014 { 3015 3016 switch (proto) { 3017 case 4: 3018 return AF_INET; 3019 #ifdef INET6 3020 case 6: 3021 return AF_INET6; 3022 #endif 3023 default: 3024 return -1; 3025 } 3026 } 3027 3028 int 3029 af2lpsvproto(int af) 3030 { 3031 3032 switch (af) { 3033 case AF_INET: 3034 return 4; 3035 #ifdef INET6 3036 case AF_INET6: 3037 return 6; 3038 #endif 3039 default: 3040 return -1; 3041 } 3042 } 3043 3044 int 3045 epsvproto2af(int proto) 3046 { 3047 3048 switch (proto) { 3049 case 1: 3050 return AF_INET; 3051 #ifdef INET6 3052 case 2: 3053 return AF_INET6; 3054 #endif 3055 default: 3056 return -1; 3057 } 3058 } 3059 3060 int 3061 af2epsvproto(int af) 3062 { 3063 3064 switch (af) { 3065 case AF_INET: 3066 return 1; 3067 #ifdef INET6 3068 case AF_INET6: 3069 return 2; 3070 #endif 3071 default: 3072 return -1; 3073 } 3074 } 3075 3076 /* 3077 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 3078 * 229 Entering Extended Passive Mode (|||port|) 3079 */ 3080 void 3081 long_passive(char *cmd, int pf) 3082 { 3083 socklen_t len; 3084 char *p, *a; 3085 3086 if (!logged_in) { 3087 syslog(LOG_NOTICE, "long passive but not logged in"); 3088 reply(503, "Login with USER first."); 3089 return; 3090 } 3091 3092 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 3093 /* 3094 * XXX: only EPRT/EPSV ready clients will understand this 3095 */ 3096 if (strcmp(cmd, "EPSV") != 0) 3097 reply(501, "Network protocol mismatch"); /*XXX*/ 3098 else 3099 epsv_protounsupp("Network protocol mismatch"); 3100 3101 return; 3102 } 3103 3104 if (pdata >= 0) 3105 close(pdata); 3106 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 3107 if (pdata < 0) { 3108 perror_reply(425, "Can't open passive connection"); 3109 return; 3110 } 3111 pasv_addr = ctrl_addr; 3112 if (bind_pasv_addr() < 0) 3113 goto pasv_error; 3114 len = pasv_addr.su_len; 3115 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 3116 goto pasv_error; 3117 pasv_addr.su_len = len; 3118 if (listen(pdata, 1) < 0) 3119 goto pasv_error; 3120 p = (char *) &pasv_addr.su_port; 3121 3122 #define UC(b) (((int) b) & 0xff) 3123 3124 if (strcmp(cmd, "LPSV") == 0) { 3125 struct sockinet *advert; 3126 3127 if (curclass.advertise.su_len != 0) 3128 advert = &curclass.advertise; 3129 else 3130 advert = &pasv_addr; 3131 switch (advert->su_family) { 3132 case AF_INET: 3133 a = (char *) &advert->su_addr; 3134 reply(228, 3135 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3136 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3137 2, UC(p[0]), UC(p[1])); 3138 return; 3139 #ifdef INET6 3140 case AF_INET6: 3141 a = (char *) &advert->su_6addr; 3142 reply(228, 3143 "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)", 3144 6, 16, 3145 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3146 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3147 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3148 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3149 2, UC(p[0]), UC(p[1])); 3150 return; 3151 #endif 3152 } 3153 #undef UC 3154 } else if (strcmp(cmd, "EPSV") == 0) { 3155 switch (pasv_addr.su_family) { 3156 case AF_INET: 3157 #ifdef INET6 3158 case AF_INET6: 3159 #endif 3160 reply(229, "Entering Extended Passive Mode (|||%d|)", 3161 ntohs(pasv_addr.su_port)); 3162 return; 3163 } 3164 } else { 3165 /* more proper error code? */ 3166 } 3167 3168 pasv_error: 3169 (void) close(pdata); 3170 pdata = -1; 3171 perror_reply(425, "Can't open passive connection"); 3172 return; 3173 } 3174 3175 int 3176 extended_port(const char *arg) 3177 { 3178 char *tmp = NULL; 3179 char *result[3]; 3180 char *p, *q; 3181 char delim; 3182 struct addrinfo hints; 3183 struct addrinfo *res = NULL; 3184 int i; 3185 unsigned long proto; 3186 3187 tmp = ftpd_strdup(arg); 3188 p = tmp; 3189 delim = p[0]; 3190 p++; 3191 memset(result, 0, sizeof(result)); 3192 for (i = 0; i < 3; i++) { 3193 q = strchr(p, delim); 3194 if (!q || *q != delim) 3195 goto parsefail; 3196 *q++ = '\0'; 3197 result[i] = p; 3198 p = q; 3199 } 3200 3201 /* some more sanity checks */ 3202 errno = 0; 3203 p = NULL; 3204 (void)strtoul(result[2], &p, 10); 3205 if (errno || !*result[2] || *p) 3206 goto parsefail; 3207 errno = 0; 3208 p = NULL; 3209 proto = strtoul(result[0], &p, 10); 3210 if (errno || !*result[0] || *p) 3211 goto protounsupp; 3212 3213 memset(&hints, 0, sizeof(hints)); 3214 hints.ai_family = epsvproto2af((int)proto); 3215 if (hints.ai_family < 0) 3216 goto protounsupp; 3217 hints.ai_socktype = SOCK_STREAM; 3218 hints.ai_flags = AI_NUMERICHOST; 3219 if (getaddrinfo(result[1], result[2], &hints, &res)) 3220 goto parsefail; 3221 if (res->ai_next) 3222 goto parsefail; 3223 if (sizeof(data_dest) < res->ai_addrlen) 3224 goto parsefail; 3225 memcpy(&data_dest.si_su, res->ai_addr, res->ai_addrlen); 3226 data_dest.su_len = res->ai_addrlen; 3227 #ifdef INET6 3228 if (his_addr.su_family == AF_INET6 && 3229 data_dest.su_family == AF_INET6) { 3230 /* XXX: more sanity checks! */ 3231 data_dest.su_scope_id = his_addr.su_scope_id; 3232 } 3233 #endif 3234 3235 if (tmp != NULL) 3236 free(tmp); 3237 if (res) 3238 freeaddrinfo(res); 3239 return 0; 3240 3241 parsefail: 3242 reply(500, "Invalid argument, rejected."); 3243 usedefault = 1; 3244 if (tmp != NULL) 3245 free(tmp); 3246 if (res) 3247 freeaddrinfo(res); 3248 return -1; 3249 3250 protounsupp: 3251 epsv_protounsupp("Protocol not supported"); 3252 usedefault = 1; 3253 if (tmp != NULL) 3254 free(tmp); 3255 return -1; 3256 } 3257 3258 /* 3259 * 522 Protocol not supported (proto,...) 3260 * as we assume address family for control and data connections are the same, 3261 * we do not return the list of address families we support - instead, we 3262 * return the address family of the control connection. 3263 */ 3264 void 3265 epsv_protounsupp(const char *message) 3266 { 3267 int proto; 3268 3269 proto = af2epsvproto(ctrl_addr.su_family); 3270 if (proto < 0) 3271 reply(501, "%s", message); /* XXX */ 3272 else 3273 reply(522, "%s, use (%d)", message, proto); 3274 } 3275 3276 /* 3277 * Generate unique name for file with basename "local". 3278 * The file named "local" is already known to exist. 3279 * Generates failure reply on error. 3280 * 3281 * XXX: this function should under go changes similar to 3282 * the mktemp(3)/mkstemp(3) changes. 3283 */ 3284 static char * 3285 gunique(const char *local) 3286 { 3287 static char new[MAXPATHLEN]; 3288 struct stat st; 3289 char *cp; 3290 int count; 3291 3292 cp = strrchr(local, '/'); 3293 if (cp) 3294 *cp = '\0'; 3295 if (stat(cp ? local : ".", &st) < 0) { 3296 perror_reply(553, cp ? local : "."); 3297 return (NULL); 3298 } 3299 if (cp) 3300 *cp = '/'; 3301 for (count = 1; count < 100; count++) { 3302 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 3303 if (stat(new, &st) < 0) 3304 return (new); 3305 } 3306 reply(452, "Unique file name cannot be created."); 3307 return (NULL); 3308 } 3309 3310 /* 3311 * Format and send reply containing system error number. 3312 */ 3313 void 3314 perror_reply(int code, const char *string) 3315 { 3316 int save_errno; 3317 3318 save_errno = errno; 3319 reply(code, "%s: %s.", string, strerror(errno)); 3320 errno = save_errno; 3321 } 3322 3323 static char *onefile[] = { 3324 "", 3325 0 3326 }; 3327 3328 void 3329 send_file_list(const char *whichf) 3330 { 3331 struct stat st; 3332 DIR *dirp; 3333 struct dirent *dir; 3334 FILE *volatile dout; 3335 char **volatile dirlist; 3336 char *dirname, *p; 3337 char *notglob; 3338 int volatile simple; 3339 int volatile freeglob; 3340 glob_t gl; 3341 3342 dirp = NULL; 3343 dout = NULL; 3344 notglob = NULL; 3345 simple = 0; 3346 freeglob = 0; 3347 urgflag = 0; 3348 3349 p = NULL; 3350 if (strpbrk(whichf, "~{[*?") != NULL) { 3351 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; 3352 3353 memset(&gl, 0, sizeof(gl)); 3354 freeglob = 1; 3355 if (glob(whichf, flags, 0, &gl)) { 3356 reply(450, "Not found"); 3357 goto cleanup_send_file_list; 3358 } else if (gl.gl_pathc == 0) { 3359 errno = ENOENT; 3360 perror_reply(450, whichf); 3361 goto cleanup_send_file_list; 3362 } 3363 dirlist = gl.gl_pathv; 3364 } else { 3365 notglob = ftpd_strdup(whichf); 3366 onefile[0] = notglob; 3367 dirlist = onefile; 3368 simple = 1; 3369 } 3370 /* XXX: } for vi sm */ 3371 3372 while ((dirname = *dirlist++) != NULL) { 3373 int trailingslash = 0; 3374 3375 if (stat(dirname, &st) < 0) { 3376 /* 3377 * If user typed "ls -l", etc, and the client 3378 * used NLST, do what the user meant. 3379 */ 3380 /* XXX: nuke this support? */ 3381 if (dirname[0] == '-' && *dirlist == NULL && 3382 transflag == 0) { 3383 char *argv[] = { INTERNAL_LS, "", NULL }; 3384 3385 argv[1] = dirname; 3386 retrieve(argv, dirname); 3387 goto cleanup_send_file_list; 3388 } 3389 perror_reply(450, whichf); 3390 goto cleanup_send_file_list; 3391 } 3392 3393 if (S_ISREG(st.st_mode)) { 3394 /* 3395 * XXXRFC: 3396 * should we follow RFC959 and not work 3397 * for non directories? 3398 */ 3399 if (dout == NULL) { 3400 dout = dataconn("file list", (off_t)-1, "w"); 3401 if (dout == NULL) 3402 goto cleanup_send_file_list; 3403 transflag = 1; 3404 } 3405 cprintf(dout, "%s%s\n", dirname, 3406 type == TYPE_A ? "\r" : ""); 3407 continue; 3408 } else if (!S_ISDIR(st.st_mode)) 3409 continue; 3410 3411 if (dirname[strlen(dirname) - 1] == '/') 3412 trailingslash++; 3413 3414 if ((dirp = opendir(dirname)) == NULL) 3415 continue; 3416 3417 while ((dir = readdir(dirp)) != NULL) { 3418 char nbuf[MAXPATHLEN]; 3419 3420 if (urgflag && handleoobcmd()) 3421 goto cleanup_send_file_list; 3422 3423 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 3424 continue; 3425 3426 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 3427 trailingslash ? "" : "/", dir->d_name); 3428 3429 /* 3430 * We have to do a stat to ensure it's 3431 * not a directory or special file. 3432 */ 3433 /* 3434 * XXXRFC: 3435 * should we follow RFC959 and filter out 3436 * non files ? lukem - NO!, or not until 3437 * our ftp client uses MLS{T,D} for completion. 3438 */ 3439 if (simple || (stat(nbuf, &st) == 0 && 3440 S_ISREG(st.st_mode))) { 3441 if (dout == NULL) { 3442 dout = dataconn("file list", (off_t)-1, 3443 "w"); 3444 if (dout == NULL) 3445 goto cleanup_send_file_list; 3446 transflag = 1; 3447 } 3448 p = nbuf; 3449 if (nbuf[0] == '.' && nbuf[1] == '/') 3450 p = &nbuf[2]; 3451 cprintf(dout, "%s%s\n", p, 3452 type == TYPE_A ? "\r" : ""); 3453 } 3454 } 3455 (void) closedir(dirp); 3456 } 3457 3458 if (dout == NULL) 3459 reply(450, "No files found."); 3460 else if (ferror(dout) != 0) 3461 perror_reply(451, "Data connection"); 3462 else 3463 reply(226, "Transfer complete."); 3464 3465 cleanup_send_file_list: 3466 closedataconn(dout); 3467 transflag = 0; 3468 urgflag = 0; 3469 total_xfers++; 3470 total_xfers_out++; 3471 if (notglob) 3472 free(notglob); 3473 if (freeglob) 3474 globfree(&gl); 3475 } 3476 3477 char * 3478 conffilename(const char *s) 3479 { 3480 static char filename[MAXPATHLEN]; 3481 3482 if (*s == '/') 3483 strlcpy(filename, s, sizeof(filename)); 3484 else 3485 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 3486 return (filename); 3487 } 3488 3489 /* 3490 * logxfer -- 3491 * if logging > 1, then based on the arguments, syslog a message: 3492 * if bytes != -1 "<command> <file1> = <bytes> bytes" 3493 * else if file2 != NULL "<command> <file1> <file2>" 3494 * else "<command> <file1>" 3495 * if elapsed != NULL, append "in xxx.yyy seconds" 3496 * if error != NULL, append ": " + error 3497 * 3498 * if doxferlog != 0, bytes != -1, and command is "get", "put", 3499 * or "append", syslog and/or write a wu-ftpd style xferlog entry 3500 */ 3501 void 3502 logxfer(const char *command, off_t bytes, const char *file1, const char *file2, 3503 const struct timeval *elapsed, const char *error) 3504 { 3505 char buf[MAXPATHLEN * 2 + 100]; 3506 char realfile1[MAXPATHLEN], realfile2[MAXPATHLEN]; 3507 const char *r1, *r2; 3508 char direction; 3509 size_t len; 3510 time_t now; 3511 3512 if (logging <=1 && !doxferlog) 3513 return; 3514 3515 r1 = r2 = NULL; 3516 if ((r1 = realpath(file1, realfile1)) == NULL) 3517 r1 = file1; 3518 if (file2 != NULL) 3519 if ((r2 = realpath(file2, realfile2)) == NULL) 3520 r2 = file2; 3521 3522 /* 3523 * syslog command 3524 */ 3525 if (logging > 1) { 3526 len = snprintf(buf, sizeof(buf), "%s %s", command, r1); 3527 if (bytes != (off_t)-1) 3528 len += snprintf(buf + len, sizeof(buf) - len, 3529 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 3530 else if (r2 != NULL) 3531 len += snprintf(buf + len, sizeof(buf) - len, 3532 " %s", r2); 3533 if (elapsed != NULL) 3534 len += snprintf(buf + len, sizeof(buf) - len, 3535 " in %ld.%.03d seconds", elapsed->tv_sec, 3536 (int)(elapsed->tv_usec / 1000)); 3537 if (error != NULL) 3538 len += snprintf(buf + len, sizeof(buf) - len, 3539 ": %s", error); 3540 syslog(LOG_INFO, "%s", buf); 3541 } 3542 3543 /* 3544 * syslog wu-ftpd style log entry, prefixed with "xferlog: " 3545 */ 3546 if (!doxferlog || bytes == -1) 3547 return; 3548 3549 if (strcmp(command, "get") == 0) 3550 direction = 'o'; 3551 else if (strcmp(command, "put") == 0 || strcmp(command, "append") == 0) 3552 direction = 'i'; 3553 else 3554 return; 3555 3556 time(&now); 3557 len = snprintf(buf, sizeof(buf), 3558 "%.24s %ld %s " LLF " %s %c %s %c %c %s FTP 0 * %c\n", 3559 3560 /* 3561 * XXX: wu-ftpd puts ' (send)' or ' (recv)' in the syslog message, and removes 3562 * the full date. This may be problematic for accurate log parsing, 3563 * given that syslog messages don't contain the full date. 3564 */ 3565 ctime(&now), 3566 elapsed == NULL ? 0 : elapsed->tv_sec + (elapsed->tv_usec > 0), 3567 remotehost, 3568 (LLT) bytes, 3569 r1, 3570 type == TYPE_A ? 'a' : 'b', 3571 "_", /* XXX: take conversions into account? */ 3572 direction, 3573 3574 curclass.type == CLASS_GUEST ? 'a' : 3575 curclass.type == CLASS_CHROOT ? 'g' : 3576 curclass.type == CLASS_REAL ? 'r' : '?', 3577 3578 curclass.type == CLASS_GUEST ? pw->pw_passwd : pw->pw_name, 3579 error != NULL ? 'i' : 'c' 3580 ); 3581 3582 if ((doxferlog & 2) && xferlogfd != -1) 3583 write(xferlogfd, buf, len); 3584 if ((doxferlog & 1)) { 3585 buf[len-1] = '\n'; /* strip \n from syslog message */ 3586 syslog(LOG_INFO, "xferlog: %s", buf); 3587 } 3588 } 3589 3590 /* 3591 * Log the resource usage. 3592 * 3593 * XXX: more resource usage to logging? 3594 */ 3595 void 3596 logrusage(const struct rusage *rusage_before, 3597 const struct rusage *rusage_after) 3598 { 3599 struct timeval usrtime, systime; 3600 3601 if (logging <= 1) 3602 return; 3603 3604 timersub(&rusage_after->ru_utime, &rusage_before->ru_utime, &usrtime); 3605 timersub(&rusage_after->ru_stime, &rusage_before->ru_stime, &systime); 3606 syslog(LOG_INFO, "%ld.%.03du %ld.%.03ds %ld+%ldio %ldpf+%ldw", 3607 usrtime.tv_sec, (int)(usrtime.tv_usec / 1000), 3608 systime.tv_sec, (int)(systime.tv_usec / 1000), 3609 rusage_after->ru_inblock - rusage_before->ru_inblock, 3610 rusage_after->ru_oublock - rusage_before->ru_oublock, 3611 rusage_after->ru_majflt - rusage_before->ru_majflt, 3612 rusage_after->ru_nswap - rusage_before->ru_nswap); 3613 } 3614 3615 /* 3616 * Determine if `password' is valid for user given in `pw'. 3617 * Returns 2 if password expired, 1 if otherwise failed, 0 if ok 3618 */ 3619 int 3620 checkpassword(const struct passwd *pwent, const char *password) 3621 { 3622 char *orig, *new; 3623 time_t change, expire, now; 3624 3625 change = expire = 0; 3626 if (pwent == NULL) 3627 return 1; 3628 3629 time(&now); 3630 orig = pwent->pw_passwd; /* save existing password */ 3631 expire = pwent->pw_expire; 3632 change = (pwent->pw_change == _PASSWORD_CHGNOW)? now : pwent->pw_change; 3633 3634 if (orig[0] == '\0') /* don't allow empty passwords */ 3635 return 1; 3636 3637 new = crypt(password, orig); /* encrypt given password */ 3638 if (strcmp(new, orig) != 0) /* compare */ 3639 return 1; 3640 3641 if ((expire && now >= expire) || (change && now >= change)) 3642 return 2; /* check if expired */ 3643 3644 return 0; /* OK! */ 3645 } 3646 3647 char * 3648 ftpd_strdup(const char *s) 3649 { 3650 char *new = strdup(s); 3651 3652 if (new == NULL) 3653 fatal("Local resource failure: malloc"); 3654 /* NOTREACHED */ 3655 return (new); 3656 } 3657 3658 /* 3659 * As per fprintf(), but increment total_bytes and total_bytes_out, 3660 * by the appropriate amount. 3661 */ 3662 void 3663 cprintf(FILE *fd, const char *fmt, ...) 3664 { 3665 off_t b; 3666 va_list ap; 3667 3668 va_start(ap, fmt); 3669 b = vfprintf(fd, fmt, ap); 3670 va_end(ap); 3671 total_bytes += b; 3672 total_bytes_out += b; 3673 } 3674 3675 #ifdef USE_PAM 3676 /* 3677 * the following code is stolen from imap-uw PAM authentication module and 3678 * login.c 3679 */ 3680 typedef struct { 3681 const char *uname; /* user name */ 3682 int triedonce; /* if non-zero, tried before */ 3683 } ftpd_cred_t; 3684 3685 static int 3686 auth_conv(int num_msg, const struct pam_message **msg, 3687 struct pam_response **resp, void *appdata) 3688 { 3689 int i; 3690 size_t n; 3691 ftpd_cred_t *cred = (ftpd_cred_t *) appdata; 3692 struct pam_response *myreply; 3693 char pbuf[FTP_BUFLEN]; 3694 3695 if (num_msg <= 0 || num_msg > PAM_MAX_NUM_MSG) 3696 return (PAM_CONV_ERR); 3697 myreply = calloc(num_msg, sizeof *myreply); 3698 if (myreply == NULL) 3699 return PAM_BUF_ERR; 3700 3701 for (i = 0; i < num_msg; i++) { 3702 myreply[i].resp_retcode = 0; 3703 myreply[i].resp = NULL; 3704 switch (msg[i]->msg_style) { 3705 case PAM_PROMPT_ECHO_ON: /* user */ 3706 myreply[i].resp = ftpd_strdup(cred->uname); 3707 /* PAM frees resp. */ 3708 break; 3709 case PAM_PROMPT_ECHO_OFF: /* authtok (password) */ 3710 /* 3711 * Only send a single 331 reply and 3712 * then expect a PASS. 3713 */ 3714 if (cred->triedonce) { 3715 syslog(LOG_ERR, 3716 "auth_conv: already performed PAM_PROMPT_ECHO_OFF"); 3717 goto fail; 3718 } 3719 cred->triedonce++; 3720 if (msg[i]->msg[0] == '\0') { 3721 (void)strlcpy(pbuf, "password", sizeof(pbuf)); 3722 } else { 3723 /* Uncapitalize msg */ 3724 (void)strlcpy(pbuf, msg[i]->msg, sizeof(pbuf)); 3725 if (isupper((unsigned char)pbuf[0])) 3726 pbuf[0] = tolower( 3727 (unsigned char)pbuf[0]); 3728 /* Remove trailing ':' and whitespace */ 3729 n = strlen(pbuf); 3730 while (n-- > 0) { 3731 if (isspace((unsigned char)pbuf[n]) || 3732 pbuf[n] == ':') 3733 pbuf[n] = '\0'; 3734 else 3735 break; 3736 } 3737 } 3738 /* Send reply, wait for a response. */ 3739 reply(331, "User %s accepted, provide %s.", 3740 cred->uname, pbuf); 3741 (void) alarm(curclass.timeout); 3742 if (getline(pbuf, sizeof(pbuf)-1, stdin) == NULL) { 3743 reply(221, "You could at least say goodbye."); 3744 dologout(0); 3745 } 3746 (void) alarm(0); 3747 /* Ensure it is PASS */ 3748 if (strncasecmp(pbuf, "PASS ", 5) != 0) { 3749 syslog(LOG_ERR, 3750 "auth_conv: unexpected reply '%.4s'", pbuf); 3751 /* XXX: should we do this reply(-530, ..) ? */ 3752 reply(-530, "Unexpected reply '%.4s'.", pbuf); 3753 goto fail; 3754 } 3755 /* Strip CRLF from "PASS" reply */ 3756 n = strlen(pbuf); 3757 while (--n >= 5 && 3758 (pbuf[n] == '\r' || pbuf[n] == '\n')) 3759 pbuf[n] = '\0'; 3760 /* Copy password into reply */ 3761 myreply[i].resp = ftpd_strdup(pbuf+5); 3762 /* PAM frees resp. */ 3763 break; 3764 case PAM_TEXT_INFO: 3765 case PAM_ERROR_MSG: 3766 break; 3767 default: /* unknown message style */ 3768 goto fail; 3769 } 3770 } 3771 3772 *resp = myreply; 3773 return PAM_SUCCESS; 3774 3775 fail: 3776 free(myreply); 3777 *resp = NULL; 3778 return PAM_CONV_ERR; 3779 } 3780 3781 /* 3782 * Attempt to authenticate the user using PAM. Returns 0 if the user is 3783 * authenticated, or 1 if not authenticated. If some sort of PAM system 3784 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 3785 * function returns -1. This can be used as an indication that we should 3786 * fall back to a different authentication mechanism. 3787 * pw maybe be updated to a new user if PAM_USER changes from curname. 3788 */ 3789 static int 3790 auth_pam(void) 3791 { 3792 const char *tmpl_user; 3793 const void *item; 3794 int rval; 3795 int e; 3796 ftpd_cred_t auth_cred = { curname, 0 }; 3797 struct pam_conv conv = { &auth_conv, &auth_cred }; 3798 3799 e = pam_start("ftpd", curname, &conv, &pamh); 3800 if (e != PAM_SUCCESS) { 3801 /* 3802 * In OpenPAM, it's OK to pass NULL to pam_strerror() 3803 * if context creation has failed in the first place. 3804 */ 3805 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 3806 return -1; 3807 } 3808 3809 e = pam_set_item(pamh, PAM_RHOST, remotehost); 3810 if (e != PAM_SUCCESS) { 3811 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 3812 pam_strerror(pamh, e)); 3813 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3814 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3815 } 3816 pamh = NULL; 3817 return -1; 3818 } 3819 3820 e = pam_set_item(pamh, PAM_SOCKADDR, &his_addr); 3821 if (e != PAM_SUCCESS) { 3822 syslog(LOG_ERR, "pam_set_item(PAM_SOCKADDR): %s", 3823 pam_strerror(pamh, e)); 3824 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3825 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3826 } 3827 pamh = NULL; 3828 return -1; 3829 } 3830 3831 e = pam_authenticate(pamh, 0); 3832 if (ftpd_debug) 3833 syslog(LOG_DEBUG, "pam_authenticate: user '%s' returned %d", 3834 curname, e); 3835 switch (e) { 3836 case PAM_SUCCESS: 3837 /* 3838 * With PAM we support the concept of a "template" 3839 * user. The user enters a login name which is 3840 * authenticated by PAM, usually via a remote service 3841 * such as RADIUS or TACACS+. If authentication 3842 * succeeds, a different but related "template" name 3843 * is used for setting the credentials, shell, and 3844 * home directory. The name the user enters need only 3845 * exist on the remote authentication server, but the 3846 * template name must be present in the local password 3847 * database. 3848 * 3849 * This is supported by two various mechanisms in the 3850 * individual modules. However, from the application's 3851 * point of view, the template user is always passed 3852 * back as a changed value of the PAM_USER item. 3853 */ 3854 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 3855 PAM_SUCCESS) { 3856 tmpl_user = (const char *) item; 3857 if (pw == NULL 3858 || strcmp(pw->pw_name, tmpl_user) != 0) { 3859 pw = sgetpwnam(tmpl_user); 3860 if (ftpd_debug) 3861 syslog(LOG_DEBUG, 3862 "auth_pam: PAM changed " 3863 "user from '%s' to '%s'", 3864 curname, pw->pw_name); 3865 (void)strlcpy(curname, pw->pw_name, 3866 curname_len); 3867 } 3868 } else 3869 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 3870 pam_strerror(pamh, e)); 3871 rval = 0; 3872 break; 3873 3874 case PAM_AUTH_ERR: 3875 case PAM_USER_UNKNOWN: 3876 case PAM_MAXTRIES: 3877 rval = 1; 3878 break; 3879 3880 default: 3881 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 3882 rval = -1; 3883 break; 3884 } 3885 3886 if (rval == 0) { 3887 e = pam_acct_mgmt(pamh, 0); 3888 if (e != PAM_SUCCESS) { 3889 syslog(LOG_ERR, "pam_acct_mgmt: %s", 3890 pam_strerror(pamh, e)); 3891 rval = 1; 3892 } 3893 } 3894 3895 if (rval != 0) { 3896 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 3897 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 3898 } 3899 pamh = NULL; 3900 } 3901 return rval; 3902 } 3903 3904 #endif /* USE_PAM */ 3905
Indexes created Fri Sep 26 08:10:20 GMT 2025