ftpd.c revision 1.179
1/* $OpenBSD: ftpd.c,v 1.179 2007/07/27 14:12:46 moritz Exp $ */ 2/* $NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $ */ 3 4/* 5 * Copyright (C) 1997 and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* 34 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 */ 61 62#ifndef lint 63static const char copyright[] = 64"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 65 The Regents of the University of California. All rights reserved.\n"; 66#endif /* not lint */ 67 68#ifndef lint 69#if 0 70static const char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 71#else 72static const char rcsid[] = 73 "$OpenBSD: ftpd.c,v 1.179 2007/07/27 14:12:46 moritz Exp $"; 74#endif 75#endif /* not lint */ 76 77/* 78 * FTP server. 79 */ 80#include <sys/param.h> 81#include <sys/stat.h> 82#include <sys/ioctl.h> 83#include <sys/socket.h> 84#include <sys/wait.h> 85#include <sys/mman.h> 86 87#include <netinet/in.h> 88#include <netinet/in_systm.h> 89#include <netinet/ip.h> 90#include <netinet/tcp.h> 91 92#define FTP_NAMES 93#include <arpa/ftp.h> 94#include <arpa/inet.h> 95#include <arpa/telnet.h> 96 97#include <bsd_auth.h> 98#include <ctype.h> 99#include <dirent.h> 100#include <errno.h> 101#include <fcntl.h> 102#include <glob.h> 103#include <limits.h> 104#include <login_cap.h> 105#include <netdb.h> 106#include <pwd.h> 107#include <signal.h> 108#include <stdarg.h> 109#include <stdio.h> 110#include <stdlib.h> 111#include <string.h> 112#include <syslog.h> 113#include <time.h> 114#include <vis.h> 115#include <unistd.h> 116#include <util.h> 117#include <utmp.h> 118#include <poll.h> 119 120#if defined(TCPWRAPPERS) 121#include <tcpd.h> 122#endif /* TCPWRAPPERS */ 123 124#include "pathnames.h" 125#include "extern.h" 126#include "monitor.h" 127 128extern off_t restart_point; 129extern char cbuf[]; 130 131union sockunion ctrl_addr; 132union sockunion data_source; 133union sockunion data_dest; 134union sockunion his_addr; 135union sockunion pasv_addr; 136 137sigset_t allsigs; 138 139int daemon_mode = 0; 140int data; 141int logged_in; 142struct passwd *pw; 143int debug = 0; 144int timeout = 900; /* timeout after 15 minutes of inactivity */ 145int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 146int logging; 147int anon_ok = 1; 148int anon_only = 0; 149int multihome = 0; 150int guest; 151int stats; 152int statfd = -1; 153int portcheck = 1; 154int dochroot; 155int type; 156int form; 157int stru; /* avoid C keyword */ 158int mode; 159int doutmp = 0; /* update utmp file */ 160int usedefault = 1; /* for data transfers */ 161int pdata = -1; /* for passive mode */ 162int family = AF_UNSPEC; 163volatile sig_atomic_t transflag; 164off_t file_size; 165off_t byte_count; 166#if !defined(CMASK) || CMASK == 0 167#undef CMASK 168#define CMASK 022 169#endif 170mode_t defumask = CMASK; /* default umask value */ 171int umaskchange = 1; /* allow user to change umask value. */ 172char tmpline[7]; 173char hostname[MAXHOSTNAMELEN]; 174char remotehost[MAXHOSTNAMELEN]; 175char dhostname[MAXHOSTNAMELEN]; 176char *guestpw; 177char ttyline[20]; 178#if 0 179char *tty = ttyline; /* for klogin */ 180#endif 181static struct utmp utmp; /* for utmp */ 182static login_cap_t *lc; 183static auth_session_t *as; 184static volatile sig_atomic_t recvurg; 185 186#if defined(TCPWRAPPERS) 187int allow_severity = LOG_INFO; 188int deny_severity = LOG_NOTICE; 189#endif /* TCPWRAPPERS */ 190 191char *ident = NULL; 192 193 194int epsvall = 0; 195 196/* 197 * Timeout intervals for retrying connections 198 * to hosts that don't accept PORT cmds. This 199 * is a kludge, but given the problems with TCP... 200 */ 201#define SWAITMAX 90 /* wait at most 90 seconds */ 202#define SWAITINT 5 /* interval between retries */ 203 204int swaitmax = SWAITMAX; 205int swaitint = SWAITINT; 206 207#ifdef HASSETPROCTITLE 208char proctitle[BUFSIZ]; /* initial part of title */ 209#endif /* HASSETPROCTITLE */ 210 211#define LOGCMD(cmd, file) \ 212 if (logging > 1) \ 213 syslog(LOG_INFO,"%s %s%s", cmd, \ 214 *(file) == '/' ? "" : curdir(), file); 215#define LOGCMD2(cmd, file1, file2) \ 216 if (logging > 1) \ 217 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 218 *(file1) == '/' ? "" : curdir(), file1, \ 219 *(file2) == '/' ? "" : curdir(), file2); 220#define LOGBYTES(cmd, file, cnt) \ 221 if (logging > 1) { \ 222 if (cnt == (off_t)-1) \ 223 syslog(LOG_INFO,"%s %s%s", cmd, \ 224 *(file) == '/' ? "" : curdir(), file); \ 225 else \ 226 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 227 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 228 } 229 230static void ack(char *); 231static void sigurg(int); 232static void myoob(void); 233static int checkuser(char *, char *); 234static FILE *dataconn(char *, off_t, char *); 235static void dolog(struct sockaddr *); 236static char *copy_dir(char *, struct passwd *); 237static char *curdir(void); 238static void end_login(void); 239static FILE *getdatasock(char *); 240static int guniquefd(char *, char **); 241static void lostconn(int); 242static void sigquit(int); 243static int receive_data(FILE *, FILE *); 244static void replydirname(const char *, const char *); 245static int send_data(FILE *, FILE *, off_t, off_t, int); 246static struct passwd * 247 sgetpwnam(char *, struct passwd *); 248static void reapchild(int); 249#if defined(TCPWRAPPERS) 250static int check_host(struct sockaddr *); 251#endif /* TCPWRAPPERS */ 252static void usage(void); 253 254void logxfer(char *, off_t, time_t); 255void set_slave_signals(void); 256 257static char * 258curdir(void) 259{ 260 static char path[MAXPATHLEN+1]; /* path + '/' */ 261 262 if (getcwd(path, sizeof(path)-1) == NULL) 263 return (""); 264 if (path[1] != '\0') /* special case for root dir. */ 265 strlcat(path, "/", sizeof path); 266 /* For guest account, skip / since it's chrooted */ 267 return (guest ? path+1 : path); 268} 269 270char *argstr = "AdDhnlMSt:T:u:UvP46"; 271 272static void 273usage(void) 274{ 275 syslog(LOG_ERR, 276 "usage: ftpd [-46ADdlMnPSU] [-T maxtimeout] [-t timeout] [-u mask]"); 277 exit(2); 278} 279 280int 281main(int argc, char *argv[]) 282{ 283 socklen_t addrlen; 284 int ch, on = 1, tos; 285 char *cp, line[LINE_MAX]; 286 FILE *fp; 287 struct hostent *hp; 288 struct sigaction sa; 289 int error = 0; 290 291 tzset(); /* in case no timezone database in ~ftp */ 292 sigfillset(&allsigs); /* used to block signals while root */ 293 sigemptyset(&sa.sa_mask); 294 sa.sa_flags = SA_RESTART; 295 296 while ((ch = getopt(argc, argv, argstr)) != -1) { 297 switch (ch) { 298 case 'A': 299 anon_only = 1; 300 break; 301 302 case 'd': 303 case 'v': /* deprecated */ 304 debug = 1; 305 break; 306 307 case 'D': 308 daemon_mode = 1; 309 break; 310 311 case 'P': 312 portcheck = 0; 313 break; 314 315 case 'h': /* deprecated */ 316 break; 317 318 case 'l': 319 logging++; /* > 1 == extra logging */ 320 break; 321 322 case 'M': 323 multihome = 1; 324 break; 325 326 case 'n': 327 anon_ok = 0; 328 break; 329 330 case 'S': 331 stats = 1; 332 break; 333 334 case 't': 335 timeout = atoi(optarg); 336 if (maxtimeout < timeout) 337 maxtimeout = timeout; 338 break; 339 340 case 'T': 341 maxtimeout = atoi(optarg); 342 if (timeout > maxtimeout) 343 timeout = maxtimeout; 344 break; 345 346 case 'u': 347 { 348 long val = 0; 349 char *p; 350 umaskchange = 0; 351 352 val = strtol(optarg, &p, 8); 353 if (*p != '\0' || val < 0 || (val & ~ACCESSPERMS)) { 354 syslog(LOG_ERR, 355 "%s is a bad value for -u, aborting..", 356 optarg); 357 exit(2); 358 } else 359 defumask = val; 360 break; 361 } 362 363 case 'U': 364 doutmp = 1; 365 break; 366 367 case '4': 368 family = AF_INET; 369 break; 370 371 case '6': 372 family = AF_INET6; 373 break; 374 375 default: 376 usage(); 377 break; 378 } 379 } 380 381 (void) freopen(_PATH_DEVNULL, "w", stderr); 382 383 /* 384 * LOG_NDELAY sets up the logging connection immediately, 385 * necessary for anonymous ftp's that chroot and can't do it later. 386 */ 387 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 388 389 if (getpwnam(FTPD_PRIVSEP_USER) == NULL) { 390 syslog(LOG_ERR, "privilege separation user %s not found", 391 FTPD_PRIVSEP_USER); 392 exit(1); 393 } 394 endpwent(); 395 396 if (daemon_mode) { 397 int *fds, i, fd; 398 struct pollfd *pfds; 399 struct addrinfo hints, *res, *res0; 400 nfds_t n; 401 402 /* 403 * Detach from parent. 404 */ 405 if (daemon(1, 1) < 0) { 406 syslog(LOG_ERR, "failed to become a daemon"); 407 exit(1); 408 } 409 sa.sa_handler = reapchild; 410 (void) sigaction(SIGCHLD, &sa, NULL); 411 412 memset(&hints, 0, sizeof(hints)); 413 hints.ai_family = family; 414 hints.ai_socktype = SOCK_STREAM; 415 hints.ai_protocol = IPPROTO_TCP; 416 hints.ai_flags = AI_PASSIVE; 417 error = getaddrinfo(NULL, "ftp", &hints, &res0); 418 if (error) { 419 syslog(LOG_ERR, "%s", gai_strerror(error)); 420 exit(1); 421 } 422 423 n = 0; 424 for (res = res0; res; res = res->ai_next) 425 n++; 426 427 fds = malloc(n * sizeof(int)); 428 pfds = malloc(n * sizeof(struct pollfd)); 429 if (!fds || !pfds) { 430 syslog(LOG_ERR, "%s", strerror(errno)); 431 exit(1); 432 } 433 434 /* 435 * Open sockets, bind it to the FTP port, and start 436 * listening. 437 */ 438 n = 0; 439 for (res = res0; res; res = res->ai_next) { 440 fds[n] = socket(res->ai_family, res->ai_socktype, 441 res->ai_protocol); 442 if (fds[n] < 0) 443 continue; 444 445 if (setsockopt(fds[n], SOL_SOCKET, SO_REUSEADDR, 446 &on, sizeof(on)) < 0) { 447 close(fds[n]); 448 fds[n] = -1; 449 continue; 450 } 451 452 if (bind(fds[n], res->ai_addr, res->ai_addrlen) < 0) { 453 close(fds[n]); 454 fds[n] = -1; 455 continue; 456 } 457 if (listen(fds[n], 32) < 0) { 458 close(fds[n]); 459 fds[n] = -1; 460 continue; 461 } 462 463 pfds[n].fd = fds[n]; 464 pfds[n].events = POLLIN; 465 n++; 466 } 467 freeaddrinfo(res0); 468 469 if (n == 0) { 470 syslog(LOG_ERR, "could not open control socket"); 471 exit(1); 472 } 473 474 /* Stash pid in pidfile */ 475 if (pidfile(NULL)) 476 syslog(LOG_ERR, "can't open pidfile: %m"); 477 /* 478 * Loop forever accepting connection requests and forking off 479 * children to handle them. 480 */ 481 while (1) { 482 if (poll(pfds, n, INFTIM) < 0) { 483 if (errno == EINTR) 484 continue; 485 syslog(LOG_ERR, "poll: %m"); 486 exit(1); 487 } 488 for (i = 0; i < n; i++) 489 if (pfds[i].revents & POLLIN) { 490 addrlen = sizeof(his_addr); 491 fd = accept(pfds[i].fd, 492 (struct sockaddr *)&his_addr, 493 &addrlen); 494 if (fd != -1) { 495 if (fork() == 0) 496 goto child; 497 close(fd); 498 } 499 } 500 } 501 502 child: 503 /* child */ 504 (void)dup2(fd, STDIN_FILENO); 505 (void)dup2(fd, STDOUT_FILENO); 506 for (i = 0; i < n; i++) 507 close(fds[i]); 508#if defined(TCPWRAPPERS) 509 /* ..in the child. */ 510 if (!check_host((struct sockaddr *)&his_addr)) 511 exit(1); 512#endif /* TCPWRAPPERS */ 513 } else { 514 addrlen = sizeof(his_addr); 515 if (getpeername(0, (struct sockaddr *)&his_addr, 516 &addrlen) < 0) { 517 /* syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); */ 518 exit(1); 519 } 520 } 521 522 /* set this here so klogin can use it... */ 523 (void)snprintf(ttyline, sizeof(ttyline), "ftp%ld", (long)getpid()); 524 525 set_slave_signals(); 526 527 addrlen = sizeof(ctrl_addr); 528 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 529 syslog(LOG_ERR, "getsockname: %m"); 530 exit(1); 531 } 532 if (his_addr.su_family == AF_INET6 && 533 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 534#if 1 535 /* 536 * IPv4 control connection arrived to AF_INET6 socket. 537 * I hate to do this, but this is the easiest solution. 538 */ 539 union sockunion tmp_addr; 540 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 541 542 tmp_addr = his_addr; 543 memset(&his_addr, 0, sizeof(his_addr)); 544 his_addr.su_sin.sin_family = AF_INET; 545 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 546 memcpy(&his_addr.su_sin.sin_addr, 547 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 548 sizeof(his_addr.su_sin.sin_addr)); 549 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 550 551 tmp_addr = ctrl_addr; 552 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 553 ctrl_addr.su_sin.sin_family = AF_INET; 554 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 555 memcpy(&ctrl_addr.su_sin.sin_addr, 556 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 557 sizeof(ctrl_addr.su_sin.sin_addr)); 558 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 559#else 560 while (fgets(line, sizeof(line), fd) != NULL) { 561 if ((cp = strchr(line, '\n')) != NULL) 562 *cp = '\0'; 563 lreply(530, "%s", line); 564 } 565 (void) fflush(stdout); 566 (void) close(fd); 567 reply(530, 568 "Connection from IPv4 mapped address is not supported."); 569 exit(0); 570#endif 571 } 572#ifdef IP_TOS 573 if (his_addr.su_family == AF_INET) { 574 tos = IPTOS_LOWDELAY; 575 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, 576 sizeof(int)) < 0) 577 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 578 } 579#endif 580 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 581 582 /* Try to handle urgent data inline */ 583#ifdef SO_OOBINLINE 584 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 585 syslog(LOG_ERR, "setsockopt: %m"); 586#endif 587 588 dolog((struct sockaddr *)&his_addr); 589 590 /* 591 * Set up default state 592 */ 593 data = -1; 594 type = TYPE_A; 595 form = FORM_N; 596 stru = STRU_F; 597 mode = MODE_S; 598 tmpline[0] = '\0'; 599 600 /* If logins are disabled, print out the message. */ 601 if ((fp = fopen(_PATH_NOLOGIN, "r")) != NULL) { 602 while (fgets(line, sizeof(line), fp) != NULL) { 603 if ((cp = strchr(line, '\n')) != NULL) 604 *cp = '\0'; 605 lreply(530, "%s", line); 606 } 607 (void) fflush(stdout); 608 (void) fclose(fp); 609 reply(530, "System not available."); 610 exit(0); 611 } 612 if ((fp = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 613 while (fgets(line, sizeof(line), fp) != NULL) { 614 if ((cp = strchr(line, '\n')) != NULL) 615 *cp = '\0'; 616 lreply(220, "%s", line); 617 } 618 (void) fflush(stdout); 619 (void) fclose(fp); 620 /* reply(220,) must follow */ 621 } 622 (void) gethostname(hostname, sizeof(hostname)); 623 624 /* Make sure hostname is fully qualified. */ 625 hp = gethostbyname(hostname); 626 if (hp != NULL) 627 strlcpy(hostname, hp->h_name, sizeof(hostname)); 628 629 if (multihome) { 630 error = getnameinfo((struct sockaddr *)&ctrl_addr, 631 ctrl_addr.su_len, dhostname, sizeof(dhostname), NULL, 0, 0); 632 } 633 634 if (error != 0) 635 reply(220, "FTP server ready."); 636 else 637 reply(220, "%s FTP server ready.", 638 (multihome ? dhostname : hostname)); 639 640 monitor_init(); 641 642 for (;;) 643 (void) yyparse(); 644 /* NOTREACHED */ 645} 646 647/* 648 * Signal handlers. 649 */ 650/*ARGSUSED*/ 651static void 652lostconn(int signo) 653{ 654 struct syslog_data sdata = SYSLOG_DATA_INIT; 655 656 sdata.log_fac = LOG_FTP; 657 if (debug) 658 syslog_r(LOG_DEBUG, &sdata, "lost connection"); 659 dologout(1); 660} 661 662static void 663sigquit(int signo) 664{ 665 struct syslog_data sdata = SYSLOG_DATA_INIT; 666 667 sdata.log_fac = LOG_FTP; 668 syslog_r(LOG_DEBUG, &sdata, "got signal %s", sys_signame[signo]); 669 dologout(1); 670} 671 672/* 673 * Save the result of a getpwnam. Used for USER command, since 674 * the data returned must not be clobbered by any other command 675 * (e.g., globbing). 676 */ 677static struct passwd * 678sgetpwnam(char *name, struct passwd *pw) 679{ 680 static struct passwd *save; 681 struct passwd *old; 682 683 if (pw == NULL && (pw = getpwnam(name)) == NULL) 684 return (NULL); 685 old = save; 686 save = pw_dup(pw); 687 if (save == NULL) { 688 perror_reply(421, "Local resource failure: malloc"); 689 dologout(1); 690 /* NOTREACHED */ 691 } 692 if (old) { 693 memset(old->pw_passwd, 0, strlen(old->pw_passwd)); 694 free(old); 695 } 696 return (save); 697} 698 699static int login_attempts; /* number of failed login attempts */ 700static int askpasswd; /* had user command, ask for passwd */ 701static char curname[MAXLOGNAME]; /* current USER name */ 702 703/* 704 * USER command. 705 * Sets global passwd pointer pw if named account exists and is acceptable; 706 * sets askpasswd if a PASS command is expected. If logged in previously, 707 * need to reset state. If name is "ftp" or "anonymous", the name is not in 708 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 709 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 710 * requesting login privileges. Disallow anyone who does not have a standard 711 * shell as returned by getusershell(). Disallow anyone mentioned in the file 712 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 713 */ 714void 715user(char *name) 716{ 717 char *cp, *shell, *style, *host; 718 char *class = NULL; 719 720 if (logged_in) { 721 kill_slave("user already logged in"); 722 end_login(); 723 } 724 725 /* Close session from previous user if there was one. */ 726 if (as) { 727 auth_close(as); 728 as = NULL; 729 } 730 if (lc) { 731 login_close(lc); 732 lc = NULL; 733 } 734 735 if ((style = strchr(name, ':')) != NULL) 736 *style++ = 0; 737 738 guest = 0; 739 host = multihome ? dhostname : hostname; 740 if (anon_ok && 741 (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0)) { 742 if (checkuser(_PATH_FTPUSERS, "ftp") || 743 checkuser(_PATH_FTPUSERS, "anonymous")) 744 reply(530, "User %s access denied.", name); 745 else if ((pw = sgetpwnam("ftp", NULL)) != NULL) { 746 guest = 1; 747 askpasswd = 1; 748 lc = login_getclass(pw->pw_class); 749 if ((as = auth_open()) == NULL || 750 auth_setpwd(as, pw) != 0 || 751 auth_setoption(as, "FTPD_HOST", host) < 0) { 752 if (as) { 753 auth_close(as); 754 as = NULL; 755 } 756 login_close(lc); 757 lc = NULL; 758 reply(421, "Local resource failure"); 759 return; 760 } 761 reply(331, 762 "Guest login ok, send your email address as password."); 763 } else 764 reply(530, "User %s unknown.", name); 765 if (!askpasswd && logging) 766 syslog(LOG_NOTICE, 767 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 768 return; 769 } 770 771 shell = _PATH_BSHELL; 772 if ((pw = sgetpwnam(name, NULL))) { 773 class = pw->pw_class; 774 if (pw->pw_shell != NULL && *pw->pw_shell != '\0') 775 shell = pw->pw_shell; 776 while ((cp = getusershell()) != NULL) 777 if (strcmp(cp, shell) == 0) 778 break; 779 shell = cp; 780 endusershell(); 781 } 782 783 /* Get login class; if invalid style treat like unknown user. */ 784 lc = login_getclass(class); 785 if (lc && (style = login_getstyle(lc, style, "auth-ftp")) == NULL) { 786 login_close(lc); 787 lc = NULL; 788 pw = NULL; 789 } 790 791 /* Do pre-authentication setup. */ 792 if (lc && ((as = auth_open()) == NULL || 793 (pw != NULL && auth_setpwd(as, pw) != 0) || 794 auth_setitem(as, AUTHV_STYLE, style) < 0 || 795 auth_setitem(as, AUTHV_NAME, name) < 0 || 796 auth_setitem(as, AUTHV_CLASS, class) < 0 || 797 auth_setoption(as, "login", "yes") < 0 || 798 auth_setoption(as, "notickets", "yes") < 0 || 799 auth_setoption(as, "FTPD_HOST", host) < 0)) { 800 if (as) { 801 auth_close(as); 802 as = NULL; 803 } 804 login_close(lc); 805 lc = NULL; 806 reply(421, "Local resource failure"); 807 return; 808 } 809 if (logging) 810 strlcpy(curname, name, sizeof(curname)); 811 812 dochroot = (lc && login_getcapbool(lc, "ftp-chroot", 0)) || 813 checkuser(_PATH_FTPCHROOT, name); 814 if (anon_only && !dochroot) { 815 if (anon_ok) 816 reply(530, "Sorry, only anonymous ftp allowed."); 817 else 818 reply(530, "User %s access denied.", name); 819 return; 820 } 821 if (pw) { 822 if ((!shell && !dochroot) || checkuser(_PATH_FTPUSERS, name)) { 823 reply(530, "User %s access denied.", name); 824 if (logging) 825 syslog(LOG_NOTICE, 826 "FTP LOGIN REFUSED FROM %s, %s", 827 remotehost, name); 828 pw = NULL; 829 return; 830 } 831 } 832 833 if (as != NULL && (cp = auth_challenge(as)) != NULL) 834 reply(331, "%s", cp); 835 else 836 reply(331, "Password required for %s.", name); 837 838 askpasswd = 1; 839 /* 840 * Delay before reading passwd after first failed 841 * attempt to slow down passwd-guessing programs. 842 */ 843 if (login_attempts) 844 sleep((unsigned) login_attempts); 845} 846 847/* 848 * Check if a user is in the file "fname" 849 */ 850static int 851checkuser(char *fname, char *name) 852{ 853 FILE *fp; 854 int found = 0; 855 char *p, line[BUFSIZ]; 856 857 if ((fp = fopen(fname, "r")) != NULL) { 858 while (fgets(line, sizeof(line), fp) != NULL) 859 if ((p = strchr(line, '\n')) != NULL) { 860 *p = '\0'; 861 if (line[0] == '#') 862 continue; 863 if (strcmp(line, name) == 0) { 864 found = 1; 865 break; 866 } 867 } 868 (void) fclose(fp); 869 } 870 return (found); 871} 872 873/* 874 * Terminate login as previous user, if any, resetting state; 875 * used when USER command is given or login fails. 876 */ 877static void 878end_login(void) 879{ 880 sigprocmask (SIG_BLOCK, &allsigs, NULL); 881 if (logged_in) { 882 ftpdlogwtmp(ttyline, "", ""); 883 if (doutmp) 884 ftpd_logout(utmp.ut_line); 885 } 886 reply(530, "Please reconnect to work as another user"); 887 _exit(0); 888} 889 890enum auth_ret 891pass(char *passwd) 892{ 893 int authok; 894 unsigned int flags; 895 FILE *fp; 896 static char homedir[MAXPATHLEN]; 897 char *motd, *dir, rootdir[MAXPATHLEN]; 898 size_t sz_pw_dir; 899 900 if (logged_in || askpasswd == 0) { 901 reply(503, "Login with USER first."); 902 return (AUTH_FAILED); 903 } 904 askpasswd = 0; 905 if (!guest) { /* "ftp" is only account allowed no password */ 906 authok = 0; 907 if (pw == NULL || pw->pw_passwd[0] == '\0') { 908 useconds_t us; 909 910 /* Sleep between 1 and 3 seconds to emulate a crypt. */ 911 us = arc4random() % 3000000; 912 usleep(us); 913 if (as != NULL) { 914 auth_close(as); 915 as = NULL; 916 } 917 } else { 918 authok = auth_userresponse(as, passwd, 0); 919 as = NULL; 920 } 921 if (authok == 0) { 922 reply(530, "Login incorrect."); 923 if (logging) 924 syslog(LOG_NOTICE, 925 "FTP LOGIN FAILED FROM %s, %s", 926 remotehost, curname); 927 pw = NULL; 928 if (login_attempts++ >= 5) { 929 syslog(LOG_NOTICE, 930 "repeated login failures from %s", 931 remotehost); 932 kill_slave("repeated login failures"); 933 _exit(0); 934 } 935 return (AUTH_FAILED); 936 } 937 } else if (lc != NULL) { 938 /* Save anonymous' password. */ 939 if (guestpw != NULL) 940 free(guestpw); 941 guestpw = strdup(passwd); 942 if (guestpw == NULL) { 943 kill_slave("out of mem"); 944 fatal("Out of memory."); 945 } 946 947 authok = auth_approval(as, lc, pw->pw_name, "ftp"); 948 auth_close(as); 949 as = NULL; 950 if (authok == 0) { 951 syslog(LOG_INFO|LOG_AUTH, 952 "FTP LOGIN FAILED (HOST) as %s: approval failure.", 953 pw->pw_name); 954 reply(530, "Approval failure."); 955 kill_slave("approval failure"); 956 _exit(0); 957 } 958 } else { 959 syslog(LOG_INFO|LOG_AUTH, 960 "FTP LOGIN CLASS %s MISSING for %s: approval failure.", 961 pw->pw_class, pw->pw_name); 962 reply(530, "Permission denied."); 963 kill_slave("permission denied"); 964 _exit(0); 965 } 966 967 if (monitor_post_auth() == 1) { 968 /* Post-auth monitor process */ 969 logged_in = 1; 970 return (AUTH_MONITOR); 971 } 972 973 login_attempts = 0; /* this time successful */ 974 /* set umask via setusercontext() unless -u flag was given. */ 975 flags = LOGIN_SETGROUP|LOGIN_SETPRIORITY|LOGIN_SETRESOURCES; 976 if (umaskchange) 977 flags |= LOGIN_SETUMASK; 978 else 979 (void) umask(defumask); 980 if (setusercontext(lc, pw, (uid_t)0, flags) != 0) { 981 perror_reply(451, "Local resource failure: setusercontext"); 982 syslog(LOG_NOTICE, "setusercontext: %m"); 983 dologout(1); 984 /* NOTREACHED */ 985 } 986 987 /* open wtmp before chroot */ 988 ftpdlogwtmp(ttyline, pw->pw_name, remotehost); 989 990 /* open utmp before chroot */ 991 if (doutmp) { 992 memset((void *)&utmp, 0, sizeof(utmp)); 993 (void)time(&utmp.ut_time); 994 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 995 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 996 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 997 ftpd_login(&utmp); 998 } 999 1000 /* open stats file before chroot */ 1001 if (guest && (stats == 1) && (statfd < 0)) 1002 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1003 stats = 0; 1004 1005 logged_in = 1; 1006 1007 if ((dir = login_getcapstr(lc, "ftp-dir", NULL, NULL))) { 1008 char *newdir; 1009 1010 newdir = copy_dir(dir, pw); 1011 if (newdir == NULL) { 1012 perror_reply(421, "Local resource failure: malloc"); 1013 dologout(1); 1014 /* NOTREACHED */ 1015 } 1016 pw->pw_dir = newdir; 1017 pw = sgetpwnam(NULL, pw); 1018 free(dir); 1019 free(newdir); 1020 } 1021 1022 /* make sure pw->pw_dir is big enough to hold "/" */ 1023 sz_pw_dir = strlen(pw->pw_dir) + 1; 1024 if (sz_pw_dir < 2) { 1025 pw->pw_dir = "/"; 1026 pw = sgetpwnam(NULL, pw); 1027 sz_pw_dir = 2; 1028 } 1029 1030 if (guest || dochroot) { 1031 if (multihome && guest) { 1032 struct stat ts; 1033 1034 /* Compute root directory. */ 1035 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1036 pw->pw_dir, dhostname); 1037 if (stat(rootdir, &ts) < 0) { 1038 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1039 pw->pw_dir, hostname); 1040 } 1041 } else 1042 strlcpy(rootdir, pw->pw_dir, sizeof(rootdir)); 1043 } 1044 if (guest) { 1045 /* 1046 * We MUST do a chdir() after the chroot. Otherwise 1047 * the old current directory will be accessible as "." 1048 * outside the new root! 1049 */ 1050 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1051 reply(550, "Can't set guest privileges."); 1052 goto bad; 1053 } 1054 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1055 if (setenv("HOME", "/", 1) == -1) { 1056 reply(550, "Can't setup environment."); 1057 goto bad; 1058 } 1059 } else if (dochroot) { 1060 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1061 reply(550, "Can't change root."); 1062 goto bad; 1063 } 1064 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1065 if (setenv("HOME", "/", 1) == -1) { 1066 reply(550, "Can't setup environment."); 1067 goto bad; 1068 } 1069 } else if (chdir(pw->pw_dir) < 0) { 1070 if (chdir("/") < 0) { 1071 reply(530, "User %s: can't change directory to %s.", 1072 pw->pw_name, pw->pw_dir); 1073 goto bad; 1074 } else 1075 lreply(230, "No directory! Logging in with home=/"); 1076 } 1077 if (setegid(pw->pw_gid) < 0 || setgid(pw->pw_gid) < 0) { 1078 reply(550, "Can't set gid."); 1079 goto bad; 1080 } 1081 if (seteuid(pw->pw_uid) < 0 || setuid(pw->pw_uid) < 0) { 1082 reply(550, "Can't set uid."); 1083 goto bad; 1084 } 1085 sigprocmask(SIG_UNBLOCK, &allsigs, NULL); 1086 1087 /* 1088 * Set home directory so that use of ~ (tilde) works correctly. 1089 */ 1090 if (getcwd(homedir, MAXPATHLEN) != NULL) { 1091 if (setenv("HOME", homedir, 1) == -1) { 1092 reply(550, "Can't setup environment."); 1093 goto bad; 1094 } 1095 } 1096 1097 /* 1098 * Display a login message, if it exists. 1099 * N.B. reply(230,) must follow the message. 1100 */ 1101 motd = login_getcapstr(lc, "welcome", NULL, NULL); 1102 if ((fp = fopen(motd ? motd : _PATH_FTPLOGINMESG, "r")) != NULL) { 1103 char *cp, line[LINE_MAX]; 1104 1105 while (fgets(line, sizeof(line), fp) != NULL) { 1106 if ((cp = strchr(line, '\n')) != NULL) 1107 *cp = '\0'; 1108 lreply(230, "%s", line); 1109 } 1110 (void) fflush(stdout); 1111 (void) fclose(fp); 1112 } 1113 if (motd != NULL) 1114 free(motd); 1115 if (guest) { 1116 if (ident != NULL) 1117 free(ident); 1118 ident = strdup(passwd); 1119 if (ident == NULL) 1120 fatal("Ran out of memory."); 1121 reply(230, "Guest login ok, access restrictions apply."); 1122#ifdef HASSETPROCTITLE 1123 snprintf(proctitle, sizeof(proctitle), 1124 "%s: anonymous/%.*s", remotehost, 1125 (int)(sizeof(proctitle) - sizeof(remotehost) - 1126 sizeof(": anonymous/")), passwd); 1127 setproctitle("%s", proctitle); 1128#endif /* HASSETPROCTITLE */ 1129 if (logging) 1130 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1131 remotehost, passwd); 1132 } else { 1133 reply(230, "User %s logged in.", pw->pw_name); 1134#ifdef HASSETPROCTITLE 1135 snprintf(proctitle, sizeof(proctitle), 1136 "%s: %s", remotehost, pw->pw_name); 1137 setproctitle("%s", proctitle); 1138#endif /* HASSETPROCTITLE */ 1139 if (logging) 1140 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1141 remotehost, pw->pw_name); 1142 } 1143 login_close(lc); 1144 lc = NULL; 1145 return (AUTH_SLAVE); 1146bad: 1147 /* Forget all about it... */ 1148 login_close(lc); 1149 lc = NULL; 1150 end_login(); 1151 return (AUTH_FAILED); 1152} 1153 1154void 1155retrieve(char *cmd, char *name) 1156{ 1157 FILE *fin, *dout; 1158 struct stat st; 1159 int (*closefunc)(FILE *); 1160 time_t start; 1161 1162 if (cmd == 0) { 1163 fin = fopen(name, "r"), closefunc = fclose; 1164 st.st_size = 0; 1165 } else { 1166 char line[BUFSIZ]; 1167 1168 (void) snprintf(line, sizeof(line), cmd, name); 1169 name = line; 1170 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1171 st.st_size = -1; 1172 st.st_blksize = BUFSIZ; 1173 } 1174 if (fin == NULL) { 1175 if (errno != 0) { 1176 perror_reply(550, name); 1177 if (cmd == 0) { 1178 LOGCMD("get", name); 1179 } 1180 } 1181 return; 1182 } 1183 byte_count = -1; 1184 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1185 reply(550, "%s: not a plain file.", name); 1186 goto done; 1187 } 1188 if (restart_point) { 1189 if (type == TYPE_A) { 1190 off_t i, n; 1191 int c; 1192 1193 n = restart_point; 1194 i = 0; 1195 while (i++ < n) { 1196 if ((c = getc(fin)) == EOF) { 1197 if (ferror(fin)) { 1198 perror_reply(550, name); 1199 goto done; 1200 } else 1201 break; 1202 } 1203 if (c == '\n') 1204 i++; 1205 } 1206 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1207 perror_reply(550, name); 1208 goto done; 1209 } 1210 } 1211 dout = dataconn(name, st.st_size, "w"); 1212 if (dout == NULL) 1213 goto done; 1214 time(&start); 1215 send_data(fin, dout, (off_t)st.st_blksize, st.st_size, 1216 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 1217 if ((cmd == 0) && stats) 1218 logxfer(name, byte_count, start); 1219 (void) fclose(dout); 1220 data = -1; 1221done: 1222 if (pdata >= 0) 1223 (void) close(pdata); 1224 pdata = -1; 1225 if (cmd == 0) 1226 LOGBYTES("get", name, byte_count); 1227 (*closefunc)(fin); 1228} 1229 1230void 1231store(char *name, char *mode, int unique) 1232{ 1233 FILE *fout, *din; 1234 int (*closefunc)(FILE *); 1235 struct stat st; 1236 int fd; 1237 1238 if (restart_point && *mode != 'a') 1239 mode = "r+"; 1240 1241 if (unique && stat(name, &st) == 0) { 1242 char *nam; 1243 1244 fd = guniquefd(name, &nam); 1245 if (fd == -1) { 1246 LOGCMD(*mode == 'w' ? "put" : "append", name); 1247 return; 1248 } 1249 name = nam; 1250 fout = fdopen(fd, mode); 1251 } else 1252 fout = fopen(name, mode); 1253 1254 closefunc = fclose; 1255 if (fout == NULL) { 1256 perror_reply(553, name); 1257 LOGCMD(*mode == 'w' ? "put" : "append", name); 1258 return; 1259 } 1260 byte_count = -1; 1261 if (restart_point) { 1262 if (type == TYPE_A) { 1263 off_t i, n; 1264 int c; 1265 1266 n = restart_point; 1267 i = 0; 1268 while (i++ < n) { 1269 if ((c = getc(fout)) == EOF) { 1270 if (ferror(fout)) { 1271 perror_reply(550, name); 1272 goto done; 1273 } else 1274 break; 1275 } 1276 if (c == '\n') 1277 i++; 1278 } 1279 /* 1280 * We must do this seek to "current" position 1281 * because we are changing from reading to 1282 * writing. 1283 */ 1284 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1285 perror_reply(550, name); 1286 goto done; 1287 } 1288 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1289 perror_reply(550, name); 1290 goto done; 1291 } 1292 } 1293 din = dataconn(name, (off_t)-1, "r"); 1294 if (din == NULL) 1295 goto done; 1296 if (receive_data(din, fout) == 0) { 1297 if (unique) 1298 reply(226, "Transfer complete (unique file name:%s).", 1299 name); 1300 else 1301 reply(226, "Transfer complete."); 1302 } 1303 (void) fclose(din); 1304 data = -1; 1305 pdata = -1; 1306done: 1307 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1308 (*closefunc)(fout); 1309} 1310 1311static FILE * 1312getdatasock(char *mode) 1313{ 1314 int on = 1, s, t, tries; 1315 1316 if (data >= 0) 1317 return (fdopen(data, mode)); 1318 sigprocmask (SIG_BLOCK, &allsigs, NULL); 1319 s = monitor_socket(ctrl_addr.su_family); 1320 if (s < 0) 1321 goto bad; 1322 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1323 &on, sizeof(on)) < 0) 1324 goto bad; 1325 /* anchor socket to avoid multi-homing problems */ 1326 data_source = ctrl_addr; 1327 data_source.su_port = htons(20); /* ftp-data port */ 1328 for (tries = 1; ; tries++) { 1329 if (monitor_bind(s, (struct sockaddr *)&data_source, 1330 data_source.su_len) >= 0) 1331 break; 1332 if (errno != EADDRINUSE || tries > 10) 1333 goto bad; 1334 sleep((unsigned int)tries); 1335 } 1336 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1337 1338#ifdef IP_TOS 1339 if (ctrl_addr.su_family == AF_INET) { 1340 on = IPTOS_THROUGHPUT; 1341 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, 1342 sizeof(int)) < 0) 1343 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1344 } 1345#endif 1346#ifdef TCP_NOPUSH 1347 /* 1348 * Turn off push flag to keep sender TCP from sending short packets 1349 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1350 * to set the send buffer size as well, but that may not be desirable 1351 * in heavy-load situations. 1352 */ 1353 on = 1; 1354 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof(on)) < 0) 1355 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1356#endif 1357#ifdef SO_SNDBUF 1358 on = 65536; 1359 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof(on)) < 0) 1360 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1361#endif 1362 1363 return (fdopen(s, mode)); 1364bad: 1365 /* Return the real value of errno (close may change it) */ 1366 t = errno; 1367 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1368 if (s >= 0) 1369 (void) close(s); 1370 errno = t; 1371 return (NULL); 1372} 1373 1374static FILE * 1375dataconn(char *name, off_t size, char *mode) 1376{ 1377 char sizebuf[32]; 1378 FILE *file = NULL; 1379 int retry = 0; 1380 in_port_t *p; 1381 u_char *fa, *ha; 1382 size_t alen; 1383 int error; 1384 1385 file_size = size; 1386 byte_count = 0; 1387 if (size != (off_t) -1) { 1388 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1389 size); 1390 } else 1391 sizebuf[0] = '\0'; 1392 if (pdata >= 0) { 1393 union sockunion from; 1394 int s; 1395 socklen_t fromlen = sizeof(from); 1396 1397 (void) alarm ((unsigned) timeout); 1398 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1399 (void) alarm (0); 1400 if (s < 0) { 1401 reply(425, "Can't open data connection."); 1402 (void) close(pdata); 1403 pdata = -1; 1404 return (NULL); 1405 } 1406 switch (from.su_family) { 1407 case AF_INET: 1408 p = (in_port_t *)&from.su_sin.sin_port; 1409 fa = (u_char *)&from.su_sin.sin_addr; 1410 ha = (u_char *)&his_addr.su_sin.sin_addr; 1411 alen = sizeof(struct in_addr); 1412 break; 1413 case AF_INET6: 1414 p = (in_port_t *)&from.su_sin6.sin6_port; 1415 fa = (u_char *)&from.su_sin6.sin6_addr; 1416 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1417 alen = sizeof(struct in6_addr); 1418 break; 1419 default: 1420 reply(425, "Can't build data connection: " 1421 "unknown address family"); 1422 (void) close(pdata); 1423 (void) close(s); 1424 pdata = -1; 1425 return (NULL); 1426 } 1427 if (from.su_family != his_addr.su_family || 1428 ntohs(*p) < IPPORT_RESERVED) { 1429 reply(425, "Can't build data connection: " 1430 "address family or port error"); 1431 (void) close(pdata); 1432 (void) close(s); 1433 pdata = -1; 1434 return (NULL); 1435 } 1436 if (portcheck && memcmp(fa, ha, alen) != 0) { 1437 reply(435, "Can't build data connection: " 1438 "illegal port number"); 1439 (void) close(pdata); 1440 (void) close(s); 1441 pdata = -1; 1442 return (NULL); 1443 } 1444 (void) close(pdata); 1445 pdata = s; 1446 reply(150, "Opening %s mode data connection for '%s'%s.", 1447 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1448 return (fdopen(pdata, mode)); 1449 } 1450 if (data >= 0) { 1451 reply(125, "Using existing data connection for '%s'%s.", 1452 name, sizebuf); 1453 usedefault = 1; 1454 return (fdopen(data, mode)); 1455 } 1456 if (usedefault) 1457 data_dest = his_addr; 1458 usedefault = 1; 1459 do { 1460 if (file != NULL) 1461 (void) fclose(file); 1462 file = getdatasock(mode); 1463 if (file == NULL) { 1464 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1465 1466 error = getnameinfo((struct sockaddr *)&data_source, 1467 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 1468 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV); 1469 if (error != 0) 1470 reply(425, "Can't create data socket: %s.", 1471 strerror(errno)); 1472 else 1473 reply(425, 1474 "Can't create data socket (%s,%s): %s.", 1475 hbuf, pbuf, strerror(errno)); 1476 return (NULL); 1477 } 1478 1479 /* 1480 * attempt to connect to reserved port on client machine; 1481 * this looks like an attack 1482 */ 1483 switch (data_dest.su_family) { 1484 case AF_INET: 1485 p = (in_port_t *)&data_dest.su_sin.sin_port; 1486 fa = (u_char *)&data_dest.su_sin.sin_addr; 1487 ha = (u_char *)&his_addr.su_sin.sin_addr; 1488 alen = sizeof(struct in_addr); 1489 break; 1490 case AF_INET6: 1491 p = (in_port_t *)&data_dest.su_sin6.sin6_port; 1492 fa = (u_char *)&data_dest.su_sin6.sin6_addr; 1493 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1494 alen = sizeof(struct in6_addr); 1495 break; 1496 default: 1497 reply(425, "Can't build data connection: " 1498 "unknown address family"); 1499 (void) fclose(file); 1500 pdata = -1; 1501 return (NULL); 1502 } 1503 if (data_dest.su_family != his_addr.su_family || 1504 ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */ 1505 reply(425, "Can't build data connection: " 1506 "address family or port error"); 1507 (void) fclose(file); 1508 return NULL; 1509 } 1510 if (portcheck && memcmp(fa, ha, alen) != 0) { 1511 reply(435, "Can't build data connection: " 1512 "illegal port number"); 1513 (void) fclose(file); 1514 return NULL; 1515 } 1516 1517 if (connect(fileno(file), (struct sockaddr *)&data_dest, 1518 data_dest.su_len) == 0) { 1519 reply(150, "Opening %s mode data connection for '%s'%s.", 1520 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1521 data = fileno(file); 1522 return (file); 1523 } 1524 if (errno != EADDRINUSE) 1525 break; 1526 sleep((unsigned) swaitint); 1527 retry += swaitint; 1528 } while (retry <= swaitmax); 1529 perror_reply(425, "Can't build data connection"); 1530 (void) fclose(file); 1531 return (NULL); 1532} 1533 1534/* 1535 * Transfer the contents of "instr" to "outstr" peer using the appropriate 1536 * encapsulation of the data subject to Mode, Structure, and Type. 1537 * 1538 * NB: Form isn't handled. 1539 */ 1540static int 1541send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1542{ 1543 int c, cnt, filefd, netfd; 1544 char *buf, *bp; 1545 size_t len; 1546 1547 transflag++; 1548 switch (type) { 1549 1550 case TYPE_A: 1551 while ((c = getc(instr)) != EOF) { 1552 if (recvurg) 1553 goto got_oob; 1554 byte_count++; 1555 if (c == '\n') { 1556 if (ferror(outstr)) 1557 goto data_err; 1558 (void) putc('\r', outstr); 1559 } 1560 (void) putc(c, outstr); 1561 } 1562 fflush(outstr); 1563 transflag = 0; 1564 if (ferror(instr)) 1565 goto file_err; 1566 if (ferror(outstr)) 1567 goto data_err; 1568 reply(226, "Transfer complete."); 1569 return(0); 1570 1571 case TYPE_I: 1572 case TYPE_L: 1573 /* 1574 * isreg is only set if we are not doing restart and we 1575 * are sending a regular file 1576 */ 1577 netfd = fileno(outstr); 1578 filefd = fileno(instr); 1579 1580 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1581 size_t fsize = (size_t)filesize; 1582 1583 buf = mmap(0, fsize, PROT_READ, MAP_SHARED, filefd, 1584 (off_t)0); 1585 if (buf == MAP_FAILED) { 1586 syslog(LOG_WARNING, "mmap(%llu): %m", 1587 (unsigned long long)fsize); 1588 goto oldway; 1589 } 1590 bp = buf; 1591 len = fsize; 1592 do { 1593 cnt = write(netfd, bp, len); 1594 if (recvurg) { 1595 munmap(buf, fsize); 1596 goto got_oob; 1597 } 1598 len -= cnt; 1599 bp += cnt; 1600 if (cnt > 0) 1601 byte_count += cnt; 1602 } while(cnt > 0 && len > 0); 1603 1604 transflag = 0; 1605 munmap(buf, fsize); 1606 if (cnt < 0) 1607 goto data_err; 1608 reply(226, "Transfer complete."); 1609 return(0); 1610 } 1611 1612oldway: 1613 if ((buf = malloc((size_t)blksize)) == NULL) { 1614 transflag = 0; 1615 perror_reply(451, "Local resource failure: malloc"); 1616 return(-1); 1617 } 1618 1619 while ((cnt = read(filefd, buf, (size_t)blksize)) > 0 && 1620 write(netfd, buf, cnt) == cnt) 1621 byte_count += cnt; 1622 transflag = 0; 1623 (void)free(buf); 1624 if (cnt != 0) { 1625 if (cnt < 0) 1626 goto file_err; 1627 goto data_err; 1628 } 1629 reply(226, "Transfer complete."); 1630 return(0); 1631 default: 1632 transflag = 0; 1633 reply(550, "Unimplemented TYPE %d in send_data", type); 1634 return(-1); 1635 } 1636 1637data_err: 1638 transflag = 0; 1639 reply(426, "Data connection"); 1640 return(-1); 1641 1642file_err: 1643 transflag = 0; 1644 reply(551, "Error on input file"); 1645 return(-1); 1646 1647got_oob: 1648 myoob(); 1649 recvurg = 0; 1650 transflag = 0; 1651 return(-1); 1652} 1653 1654/* 1655 * Transfer data from peer to "outstr" using the appropriate encapulation of 1656 * the data subject to Mode, Structure, and Type. 1657 * 1658 * N.B.: Form isn't handled. 1659 */ 1660static int 1661receive_data(FILE *instr, FILE *outstr) 1662{ 1663 int c; 1664 int cnt; 1665 char buf[BUFSIZ]; 1666 struct sigaction sa, sa_saved; 1667 volatile int bare_lfs = 0; 1668 1669 transflag++; 1670 switch (type) { 1671 1672 case TYPE_I: 1673 case TYPE_L: 1674 memset(&sa, 0, sizeof(sa)); 1675 sigfillset(&sa.sa_mask); 1676 sa.sa_flags = SA_RESTART; 1677 sa.sa_handler = lostconn; 1678 (void) sigaction(SIGALRM, &sa, &sa_saved); 1679 do { 1680 (void) alarm ((unsigned) timeout); 1681 cnt = read(fileno(instr), buf, sizeof(buf)); 1682 (void) alarm (0); 1683 if (recvurg) 1684 goto got_oob; 1685 1686 if (cnt > 0) { 1687 if (write(fileno(outstr), buf, cnt) != cnt) 1688 goto file_err; 1689 byte_count += cnt; 1690 } 1691 } while (cnt > 0); 1692 (void) sigaction(SIGALRM, &sa_saved, NULL); 1693 if (cnt < 0) 1694 goto data_err; 1695 transflag = 0; 1696 return (0); 1697 1698 case TYPE_E: 1699 reply(553, "TYPE E not implemented."); 1700 transflag = 0; 1701 return (-1); 1702 1703 case TYPE_A: 1704 while ((c = getc(instr)) != EOF) { 1705 if (recvurg) 1706 goto got_oob; 1707 byte_count++; 1708 if (c == '\n') 1709 bare_lfs++; 1710 while (c == '\r') { 1711 if (ferror(outstr)) 1712 goto data_err; 1713 if ((c = getc(instr)) != '\n') { 1714 (void) putc ('\r', outstr); 1715 if (c == '\0' || c == EOF) 1716 goto contin2; 1717 } 1718 } 1719 (void) putc(c, outstr); 1720 contin2: ; 1721 } 1722 fflush(outstr); 1723 if (ferror(instr)) 1724 goto data_err; 1725 if (ferror(outstr)) 1726 goto file_err; 1727 transflag = 0; 1728 if (bare_lfs) { 1729 lreply(226, 1730 "WARNING! %d bare linefeeds received in ASCII mode", 1731 bare_lfs); 1732 printf(" File may not have transferred correctly.\r\n"); 1733 } 1734 return (0); 1735 default: 1736 reply(550, "Unimplemented TYPE %d in receive_data", type); 1737 transflag = 0; 1738 return (-1); 1739 } 1740 1741data_err: 1742 transflag = 0; 1743 reply(426, "Data Connection"); 1744 return (-1); 1745 1746file_err: 1747 transflag = 0; 1748 reply(452, "Error writing file"); 1749 return (-1); 1750 1751got_oob: 1752 myoob(); 1753 recvurg = 0; 1754 transflag = 0; 1755 return (-1); 1756} 1757 1758void 1759statfilecmd(char *filename) 1760{ 1761 FILE *fin; 1762 int c; 1763 int atstart; 1764 char line[LINE_MAX]; 1765 1766 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1767 fin = ftpd_popen(line, "r"); 1768 lreply(211, "status of %s:", filename); 1769 atstart = 1; 1770 while ((c = getc(fin)) != EOF) { 1771 if (c == '\n') { 1772 if (ferror(stdout)){ 1773 perror_reply(421, "control connection"); 1774 (void) ftpd_pclose(fin); 1775 dologout(1); 1776 /* NOTREACHED */ 1777 } 1778 if (ferror(fin)) { 1779 perror_reply(551, filename); 1780 (void) ftpd_pclose(fin); 1781 return; 1782 } 1783 (void) putc('\r', stdout); 1784 } 1785 if (atstart && isdigit(c)) 1786 (void) putc(' ', stdout); 1787 (void) putc(c, stdout); 1788 atstart = (c == '\n'); 1789 } 1790 (void) ftpd_pclose(fin); 1791 reply(211, "End of Status"); 1792} 1793 1794void 1795statcmd(void) 1796{ 1797 union sockunion *su; 1798 u_char *a, *p; 1799 char hbuf[MAXHOSTNAMELEN]; 1800 int ispassive; 1801 int error; 1802 1803 lreply(211, "%s FTP server status:", hostname); 1804 error = getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1805 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST); 1806 printf(" Connected to %s", remotehost); 1807 if (error == 0 && strcmp(remotehost, hbuf) != 0) 1808 printf(" (%s)", hbuf); 1809 printf("\r\n"); 1810 if (logged_in) { 1811 if (guest) 1812 printf(" Logged in anonymously\r\n"); 1813 else 1814 printf(" Logged in as %s\r\n", pw->pw_name); 1815 } else if (askpasswd) 1816 printf(" Waiting for password\r\n"); 1817 else 1818 printf(" Waiting for user name\r\n"); 1819 printf(" TYPE: %s", typenames[type]); 1820 if (type == TYPE_A || type == TYPE_E) 1821 printf(", FORM: %s", formnames[form]); 1822 if (type == TYPE_L) 1823#if NBBY == 8 1824 printf(" %d", NBBY); 1825#else 1826 printf(" %d", bytesize); /* need definition! */ 1827#endif 1828 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1829 strunames[stru], modenames[mode]); 1830 ispassive = 0; 1831 if (data != -1) 1832 printf(" Data connection open\r\n"); 1833 else if (pdata != -1) { 1834 printf(" in Passive mode\r\n"); 1835 su = (union sockunion *)&pasv_addr; 1836 ispassive++; 1837 goto printaddr; 1838 } else if (usedefault == 0) { 1839 size_t alen; 1840 int af, i; 1841 1842 su = (union sockunion *)&data_dest; 1843printaddr: 1844 /* PASV/PORT */ 1845 if (su->su_family == AF_INET) { 1846 if (ispassive) 1847 printf("211- PASV "); 1848 else 1849 printf("211- PORT "); 1850 a = (u_char *)&su->su_sin.sin_addr; 1851 p = (u_char *)&su->su_sin.sin_port; 1852 printf("(%u,%u,%u,%u,%u,%u)\r\n", 1853 a[0], a[1], a[2], a[3], 1854 p[0], p[1]); 1855 } 1856 1857 /* LPSV/LPRT */ 1858 alen = 0; 1859 switch (su->su_family) { 1860 case AF_INET: 1861 a = (u_char *)&su->su_sin.sin_addr; 1862 p = (u_char *)&su->su_sin.sin_port; 1863 alen = sizeof(su->su_sin.sin_addr); 1864 af = 4; 1865 break; 1866 case AF_INET6: 1867 a = (u_char *)&su->su_sin6.sin6_addr; 1868 p = (u_char *)&su->su_sin6.sin6_port; 1869 alen = sizeof(su->su_sin6.sin6_addr); 1870 af = 6; 1871 break; 1872 default: 1873 af = 0; 1874 break; 1875 } 1876 if (af) { 1877 if (ispassive) 1878 printf("211- LPSV "); 1879 else 1880 printf("211- LPRT "); 1881 printf("(%u,%llu", af, (unsigned long long)alen); 1882 for (i = 0; i < alen; i++) 1883 printf(",%u", a[i]); 1884 printf(",%u,%u,%u)\r\n", 2, p[0], p[1]); 1885 } 1886 1887 /* EPRT/EPSV */ 1888 switch (su->su_family) { 1889 case AF_INET: 1890 af = 1; 1891 break; 1892 case AF_INET6: 1893 af = 2; 1894 break; 1895 default: 1896 af = 0; 1897 break; 1898 } 1899 if (af) { 1900 char pbuf[10]; 1901 union sockunion tmp = *su; 1902 1903 if (tmp.su_family == AF_INET6) 1904 tmp.su_sin6.sin6_scope_id = 0; 1905 if (getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 1906 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1907 NI_NUMERICHOST | NI_NUMERICSERV) == 0) { 1908 if (ispassive) 1909 printf("211- EPSV "); 1910 else 1911 printf("211- EPRT "); 1912 printf("(|%u|%s|%s|)\r\n", 1913 af, hbuf, pbuf); 1914 } 1915 } 1916 } else 1917 printf(" No data connection\r\n"); 1918 reply(211, "End of status"); 1919} 1920 1921void 1922fatal(char *s) 1923{ 1924 1925 reply(451, "Error in server: %s", s); 1926 reply(221, "Closing connection due to server error."); 1927 dologout(0); 1928 /* NOTREACHED */ 1929} 1930 1931void 1932reply(int n, const char *fmt, ...) 1933{ 1934 char *buf, *p, *next; 1935 int rval; 1936 va_list ap; 1937 1938 va_start(ap, fmt); 1939 rval = vasprintf(&buf, fmt, ap); 1940 va_end(ap); 1941 if (rval == -1 || buf == NULL) { 1942 printf("412 Local resource failure: malloc\r\n"); 1943 fflush(stdout); 1944 dologout(1); 1945 } 1946 next = buf; 1947 while ((p = strsep(&next, "\n\r"))) { 1948 printf("%d%s %s\r\n", n, (next != '\0') ? "-" : "", p); 1949 if (debug) 1950 syslog(LOG_DEBUG, "<--- %d%s %s", n, 1951 (next != '\0') ? "-" : "", p); 1952 } 1953 (void)fflush(stdout); 1954 free(buf); 1955} 1956 1957 1958void 1959reply_r(int n, const char *fmt, ...) 1960{ 1961 char *p, *next; 1962 char msg[BUFSIZ]; 1963 char buf[BUFSIZ]; 1964 va_list ap; 1965 struct syslog_data sdata = SYSLOG_DATA_INIT; 1966 1967 sdata.log_fac = LOG_FTP; 1968 va_start(ap, fmt); 1969 vsnprintf(msg, sizeof(msg), fmt, ap); 1970 va_end(ap); 1971 1972 next = msg; 1973 1974 while ((p = strsep(&next, "\n\r"))) { 1975 snprintf(buf, sizeof(buf), "%d%s %s\r\n", n, 1976 (next != '\0') ? "-" : "", p); 1977 write(STDOUT_FILENO, buf, strlen(buf)); 1978 if (debug) { 1979 buf[strlen(buf) - 2] = '\0'; 1980 syslog_r(LOG_DEBUG, &sdata, "<--- %s", buf); 1981 } 1982 } 1983} 1984 1985void 1986lreply(int n, const char *fmt, ...) 1987{ 1988 va_list ap; 1989 1990 va_start(ap, fmt); 1991 (void)printf("%d- ", n); 1992 (void)vprintf(fmt, ap); 1993 va_end(ap); 1994 (void)printf("\r\n"); 1995 (void)fflush(stdout); 1996 if (debug) { 1997 va_start(ap, fmt); 1998 syslog(LOG_DEBUG, "<--- %d- ", n); 1999 vsyslog(LOG_DEBUG, fmt, ap); 2000 va_end(ap); 2001 } 2002} 2003 2004static void 2005ack(char *s) 2006{ 2007 2008 reply(250, "%s command successful.", s); 2009} 2010 2011void 2012nack(char *s) 2013{ 2014 2015 reply(502, "%s command not implemented.", s); 2016} 2017 2018/* ARGSUSED */ 2019void 2020yyerror(char *s) 2021{ 2022 char *cp; 2023 2024 if ((cp = strchr(cbuf,'\n'))) 2025 *cp = '\0'; 2026 reply(500, "'%s': command not understood.", cbuf); 2027} 2028 2029void 2030delete(char *name) 2031{ 2032 struct stat st; 2033 2034 LOGCMD("delete", name); 2035 if (stat(name, &st) < 0) { 2036 perror_reply(550, name); 2037 return; 2038 } 2039 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2040 if (rmdir(name) < 0) { 2041 perror_reply(550, name); 2042 return; 2043 } 2044 goto done; 2045 } 2046 if (unlink(name) < 0) { 2047 perror_reply(550, name); 2048 return; 2049 } 2050done: 2051 ack("DELE"); 2052} 2053 2054void 2055cwd(char *path) 2056{ 2057 FILE *message; 2058 2059 if (chdir(path) < 0) 2060 perror_reply(550, path); 2061 else { 2062 if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) { 2063 char *cp, line[LINE_MAX]; 2064 2065 while (fgets(line, sizeof(line), message) != NULL) { 2066 if ((cp = strchr(line, '\n')) != NULL) 2067 *cp = '\0'; 2068 lreply(250, "%s", line); 2069 } 2070 (void) fflush(stdout); 2071 (void) fclose(message); 2072 } 2073 ack("CWD"); 2074 } 2075} 2076 2077void 2078replydirname(const char *name, const char *message) 2079{ 2080 char *p, *ep; 2081 char npath[MAXPATHLEN * 2]; 2082 2083 p = npath; 2084 ep = &npath[sizeof(npath) - 1]; 2085 while (*name) { 2086 if (*name == '"') { 2087 if (ep - p < 2) 2088 break; 2089 *p++ = *name++; 2090 *p++ = '"'; 2091 } else { 2092 if (ep - p < 1) 2093 break; 2094 *p++ = *name++; 2095 } 2096 } 2097 *p = '\0'; 2098 reply(257, "\"%s\" %s", npath, message); 2099} 2100 2101void 2102makedir(char *name) 2103{ 2104 2105 LOGCMD("mkdir", name); 2106 if (mkdir(name, 0777) < 0) 2107 perror_reply(550, name); 2108 else 2109 replydirname(name, "directory created."); 2110} 2111 2112void 2113removedir(char *name) 2114{ 2115 2116 LOGCMD("rmdir", name); 2117 if (rmdir(name) < 0) 2118 perror_reply(550, name); 2119 else 2120 ack("RMD"); 2121} 2122 2123void 2124pwd(void) 2125{ 2126 char path[MAXPATHLEN]; 2127 2128 if (getcwd(path, sizeof(path)) == NULL) 2129 perror_reply(550, "Can't get current directory"); 2130 else 2131 replydirname(path, "is current directory."); 2132} 2133 2134char * 2135renamefrom(char *name) 2136{ 2137 struct stat st; 2138 2139 if (stat(name, &st) < 0) { 2140 perror_reply(550, name); 2141 return ((char *)0); 2142 } 2143 reply(350, "File exists, ready for destination name"); 2144 return (name); 2145} 2146 2147void 2148renamecmd(char *from, char *to) 2149{ 2150 2151 LOGCMD2("rename", from, to); 2152 if (rename(from, to) < 0) 2153 perror_reply(550, "rename"); 2154 else 2155 ack("RNTO"); 2156} 2157 2158static void 2159dolog(struct sockaddr *sa) 2160{ 2161 char hbuf[sizeof(remotehost)]; 2162 2163 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0) == 0) 2164 (void) strlcpy(remotehost, hbuf, sizeof(remotehost)); 2165 else 2166 (void) strlcpy(remotehost, "unknown", sizeof(remotehost)); 2167 2168#ifdef HASSETPROCTITLE 2169 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2170 setproctitle("%s", proctitle); 2171#endif /* HASSETPROCTITLE */ 2172 2173 if (logging) 2174 syslog(LOG_INFO, "connection from %s", remotehost); 2175} 2176 2177/* 2178 * Record logout in wtmp file and exit with supplied status. 2179 * NOTE: because this is called from signal handlers it cannot 2180 * use stdio (or call other functions that use stdio). 2181 */ 2182void 2183dologout(int status) 2184{ 2185 2186 transflag = 0; 2187 2188 if (logged_in) { 2189 sigprocmask(SIG_BLOCK, &allsigs, NULL); 2190 ftpdlogwtmp(ttyline, "", ""); 2191 if (doutmp) 2192 ftpd_logout(utmp.ut_line); 2193 } 2194 /* beware of flushing buffers after a SIGPIPE */ 2195 _exit(status); 2196} 2197 2198/*ARGSUSED*/ 2199static void 2200sigurg(int signo) 2201{ 2202 2203 recvurg = 1; 2204} 2205 2206static void 2207myoob(void) 2208{ 2209 char *cp; 2210 2211 /* only process if transfer occurring */ 2212 if (!transflag) 2213 return; 2214 cp = tmpline; 2215 if (getline(cp, 7, stdin) == NULL) { 2216 reply(221, "You could at least say goodbye."); 2217 dologout(0); 2218 } 2219 upper(cp); 2220 if (strcmp(cp, "ABOR\r\n") == 0) { 2221 tmpline[0] = '\0'; 2222 reply(426, "Transfer aborted. Data connection closed."); 2223 reply(226, "Abort successful"); 2224 } 2225 if (strcmp(cp, "STAT\r\n") == 0) { 2226 tmpline[0] = '\0'; 2227 if (file_size != (off_t) -1) 2228 reply(213, "Status: %qd of %qd bytes transferred", 2229 byte_count, file_size); 2230 else 2231 reply(213, "Status: %qd bytes transferred", byte_count); 2232 } 2233} 2234 2235/* 2236 * Note: a response of 425 is not mentioned as a possible response to 2237 * the PASV command in RFC959. However, it has been blessed as 2238 * a legitimate response by Jon Postel in a telephone conversation 2239 * with Rick Adams on 25 Jan 89. 2240 */ 2241void 2242passive(void) 2243{ 2244 socklen_t len; 2245 int on; 2246 u_char *p, *a; 2247 2248 if (pw == NULL) { 2249 reply(530, "Please login with USER and PASS"); 2250 return; 2251 } 2252 if (pdata >= 0) 2253 close(pdata); 2254 /* 2255 * XXX 2256 * At this point, it would be nice to have an algorithm that 2257 * inserted a growing delay in an attack scenario. Such a thing 2258 * would look like continual passive sockets being opened, but 2259 * nothing serious being done with them. They're not used to 2260 * move data; the entire attempt is just to use tcp FIN_WAIT 2261 * resources. 2262 */ 2263 pdata = socket(AF_INET, SOCK_STREAM, 0); 2264 if (pdata < 0) { 2265 perror_reply(425, "Can't open passive connection"); 2266 return; 2267 } 2268 2269 on = IP_PORTRANGE_HIGH; 2270 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2271 &on, sizeof(on)) < 0) 2272 goto pasv_error; 2273 2274 pasv_addr = ctrl_addr; 2275 pasv_addr.su_sin.sin_port = 0; 2276 if (bind(pdata, (struct sockaddr *)&pasv_addr, 2277 pasv_addr.su_len) < 0) 2278 goto pasv_error; 2279 2280 len = sizeof(pasv_addr); 2281 if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) < 0) 2282 goto pasv_error; 2283 if (listen(pdata, 1) < 0) 2284 goto pasv_error; 2285 a = (u_char *)&pasv_addr.su_sin.sin_addr; 2286 p = (u_char *)&pasv_addr.su_sin.sin_port; 2287 2288 reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0], 2289 a[1], a[2], a[3], p[0], p[1]); 2290 return; 2291 2292pasv_error: 2293 perror_reply(425, "Can't open passive connection"); 2294 (void) close(pdata); 2295 pdata = -1; 2296 return; 2297} 2298 2299int 2300epsvproto2af(int proto) 2301{ 2302 2303 switch (proto) { 2304 case 1: return AF_INET; 2305#ifdef INET6 2306 case 2: return AF_INET6; 2307#endif 2308 default: return -1; 2309 } 2310} 2311 2312int 2313af2epsvproto(int af) 2314{ 2315 2316 switch (af) { 2317 case AF_INET: return 1; 2318#ifdef INET6 2319 case AF_INET6: return 2; 2320#endif 2321 default: return -1; 2322 } 2323} 2324 2325/* 2326 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2327 * 229 Entering Extended Passive Mode (|||port|) 2328 */ 2329void 2330long_passive(char *cmd, int pf) 2331{ 2332 socklen_t len; 2333 int on; 2334 u_char *p, *a; 2335 2336 if (!logged_in) { 2337 syslog(LOG_NOTICE, "long passive but not logged in"); 2338 reply(503, "Login with USER first."); 2339 return; 2340 } 2341 2342 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2343 /* 2344 * XXX 2345 * only EPRT/EPSV ready clients will understand this 2346 */ 2347 if (strcmp(cmd, "EPSV") != 0) 2348 reply(501, "Network protocol mismatch"); /*XXX*/ 2349 else 2350 epsv_protounsupp("Network protocol mismatch"); 2351 2352 return; 2353 } 2354 2355 if (pdata >= 0) 2356 close(pdata); 2357 /* 2358 * XXX 2359 * At this point, it would be nice to have an algorithm that 2360 * inserted a growing delay in an attack scenario. Such a thing 2361 * would look like continual passive sockets being opened, but 2362 * nothing serious being done with them. They not used to move 2363 * data; the entire attempt is just to use tcp FIN_WAIT 2364 * resources. 2365 */ 2366 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2367 if (pdata < 0) { 2368 perror_reply(425, "Can't open passive connection"); 2369 return; 2370 } 2371 2372 switch (ctrl_addr.su_family) { 2373 case AF_INET: 2374 on = IP_PORTRANGE_HIGH; 2375 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2376 &on, sizeof(on)) < 0) 2377 goto pasv_error; 2378 break; 2379 case AF_INET6: 2380 on = IPV6_PORTRANGE_HIGH; 2381 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2382 &on, sizeof(on)) < 0) 2383 goto pasv_error; 2384 break; 2385 } 2386 2387 pasv_addr = ctrl_addr; 2388 pasv_addr.su_port = 0; 2389 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2390 goto pasv_error; 2391 len = pasv_addr.su_len; 2392 if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) < 0) 2393 goto pasv_error; 2394 if (listen(pdata, 1) < 0) 2395 goto pasv_error; 2396 p = (u_char *)&pasv_addr.su_port; 2397 2398 if (strcmp(cmd, "LPSV") == 0) { 2399 switch (pasv_addr.su_family) { 2400 case AF_INET: 2401 a = (u_char *)&pasv_addr.su_sin.sin_addr; 2402 reply(228, 2403 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2404 4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]); 2405 return; 2406 case AF_INET6: 2407 a = (u_char *)&pasv_addr.su_sin6.sin6_addr; 2408 reply(228, 2409 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u," 2410 "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2411 6, 16, a[0], a[1], a[2], a[3], a[4], 2412 a[5], a[6], a[7], a[8], a[9], a[10], 2413 a[11], a[12], a[13], a[14], a[15], 2414 2, p[0], p[1]); 2415 return; 2416 } 2417 } else if (strcmp(cmd, "EPSV") == 0) { 2418 switch (pasv_addr.su_family) { 2419 case AF_INET: 2420 case AF_INET6: 2421 reply(229, "Entering Extended Passive Mode (|||%u|)", 2422 ntohs(pasv_addr.su_port)); 2423 return; 2424 } 2425 } else { 2426 /* more proper error code? */ 2427 } 2428 2429 pasv_error: 2430 perror_reply(425, "Can't open passive connection"); 2431 (void) close(pdata); 2432 pdata = -1; 2433 return; 2434} 2435 2436/* 2437 * EPRT |proto|addr|port| 2438 */ 2439int 2440extended_port(const char *arg) 2441{ 2442 char *tmp = NULL; 2443 char *result[3]; 2444 char *p, *q; 2445 char delim; 2446 struct addrinfo hints; 2447 struct addrinfo *res = NULL; 2448 int i; 2449 unsigned long proto; 2450 2451 if (epsvall) { 2452 reply(501, "EPRT disallowed after EPSV ALL"); 2453 return -1; 2454 } 2455 2456 usedefault = 0; 2457 if (pdata >= 0) { 2458 (void) close(pdata); 2459 pdata = -1; 2460 } 2461 2462 tmp = strdup(arg); 2463 if (!tmp) { 2464 fatal("not enough core."); 2465 /*NOTREACHED*/ 2466 } 2467 p = tmp; 2468 delim = p[0]; 2469 p++; 2470 memset(result, 0, sizeof(result)); 2471 for (i = 0; i < 3; i++) { 2472 q = strchr(p, delim); 2473 if (!q || *q != delim) 2474 goto parsefail; 2475 *q++ = '\0'; 2476 result[i] = p; 2477 p = q; 2478 } 2479 2480 /* some more sanity check */ 2481 p = NULL; 2482 (void)strtoul(result[2], &p, 10); 2483 if (!*result[2] || *p) 2484 goto protounsupp; 2485 p = NULL; 2486 proto = strtoul(result[0], &p, 10); 2487 if (!*result[0] || *p) 2488 goto protounsupp; 2489 2490 memset(&hints, 0, sizeof(hints)); 2491 hints.ai_family = epsvproto2af((int)proto); 2492 if (hints.ai_family < 0) 2493 goto protounsupp; 2494 hints.ai_socktype = SOCK_STREAM; 2495 hints.ai_flags = AI_NUMERICHOST; /*no DNS*/ 2496 if (getaddrinfo(result[1], result[2], &hints, &res)) 2497 goto parsefail; 2498 if (res->ai_next) 2499 goto parsefail; 2500 if (sizeof(data_dest) < res->ai_addrlen) 2501 goto parsefail; 2502 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2503 if (his_addr.su_family == AF_INET6 && 2504 data_dest.su_family == AF_INET6) { 2505 /* XXX more sanity checks! */ 2506 data_dest.su_sin6.sin6_scope_id = 2507 his_addr.su_sin6.sin6_scope_id; 2508 } 2509 if (pdata >= 0) { 2510 (void) close(pdata); 2511 pdata = -1; 2512 } 2513 reply(200, "EPRT command successful."); 2514 2515 if (tmp) 2516 free(tmp); 2517 if (res) 2518 freeaddrinfo(res); 2519 return 0; 2520 2521parsefail: 2522 reply(500, "Invalid argument, rejected."); 2523 usedefault = 1; 2524 if (tmp) 2525 free(tmp); 2526 if (res) 2527 freeaddrinfo(res); 2528 return -1; 2529 2530protounsupp: 2531 epsv_protounsupp("Protocol not supported"); 2532 usedefault = 1; 2533 if (tmp) 2534 free(tmp); 2535 if (res) 2536 freeaddrinfo(res); 2537 return -1; 2538} 2539 2540/* 2541 * 522 Protocol not supported (proto,...) 2542 * as we assume address family for control and data connections are the same, 2543 * we do not return the list of address families we support - instead, we 2544 * return the address family of the control connection. 2545 */ 2546void 2547epsv_protounsupp(const char *message) 2548{ 2549 int proto; 2550 2551 proto = af2epsvproto(ctrl_addr.su_family); 2552 if (proto < 0) 2553 reply(501, "%s", message); /*XXX*/ 2554 else 2555 reply(522, "%s, use (%d)", message, proto); 2556} 2557 2558/* 2559 * Generate unique name for file with basename "local". 2560 * The file named "local" is already known to exist. 2561 * Generates failure reply on error. 2562 */ 2563static int 2564guniquefd(char *local, char **nam) 2565{ 2566 static char new[MAXPATHLEN]; 2567 struct stat st; 2568 int count, len, fd; 2569 char *cp; 2570 2571 cp = strrchr(local, '/'); 2572 if (cp) 2573 *cp = '\0'; 2574 if (stat(cp ? local : ".", &st) < 0) { 2575 perror_reply(553, cp ? local : "."); 2576 return (-1); 2577 } 2578 if (cp) 2579 *cp = '/'; 2580 len = strlcpy(new, local, sizeof(new)); 2581 if (len+2+1 >= sizeof(new)-1) 2582 return (-1); 2583 cp = new + len; 2584 *cp++ = '.'; 2585 for (count = 1; count < 100; count++) { 2586 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 2587 fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666); 2588 if (fd == -1) 2589 continue; 2590 if (nam) 2591 *nam = new; 2592 return (fd); 2593 } 2594 reply(452, "Unique file name cannot be created."); 2595 return (-1); 2596} 2597 2598/* 2599 * Format and send reply containing system error number. 2600 */ 2601void 2602perror_reply(int code, char *string) 2603{ 2604 2605 reply(code, "%s: %s.", string, strerror(errno)); 2606} 2607 2608static char *onefile[] = { 2609 "", 2610 0 2611}; 2612 2613void 2614send_file_list(char *whichf) 2615{ 2616 struct stat st; 2617 DIR *dirp = NULL; 2618 struct dirent *dir; 2619 FILE *dout = NULL; 2620 char **dirlist; 2621 char *dirname; 2622 int simple = 0; 2623 volatile int freeglob = 0; 2624 glob_t gl; 2625 2626 if (strpbrk(whichf, "~{[*?") != NULL) { 2627 memset(&gl, 0, sizeof(gl)); 2628 freeglob = 1; 2629 if (glob(whichf, 2630 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, 2631 0, &gl)) { 2632 reply(550, "not found"); 2633 goto out; 2634 } else if (gl.gl_pathc == 0) { 2635 errno = ENOENT; 2636 perror_reply(550, whichf); 2637 goto out; 2638 } 2639 dirlist = gl.gl_pathv; 2640 } else { 2641 onefile[0] = whichf; 2642 dirlist = onefile; 2643 simple = 1; 2644 } 2645 2646 while ((dirname = *dirlist++)) { 2647 if (stat(dirname, &st) < 0) { 2648 /* 2649 * If user typed "ls -l", etc, and the client 2650 * used NLST, do what the user meant. 2651 */ 2652 if (dirname[0] == '-' && *dirlist == NULL && 2653 transflag == 0) { 2654 retrieve("/bin/ls %s", dirname); 2655 goto out; 2656 } 2657 perror_reply(550, whichf); 2658 if (dout != NULL) { 2659 (void) fclose(dout); 2660 transflag = 0; 2661 data = -1; 2662 pdata = -1; 2663 } 2664 goto out; 2665 } 2666 2667 if (S_ISREG(st.st_mode)) { 2668 if (dout == NULL) { 2669 dout = dataconn("file list", (off_t)-1, "w"); 2670 if (dout == NULL) 2671 goto out; 2672 transflag++; 2673 } 2674 fprintf(dout, "%s%s\n", dirname, 2675 type == TYPE_A ? "\r" : ""); 2676 byte_count += strlen(dirname) + 1; 2677 continue; 2678 } else if (!S_ISDIR(st.st_mode)) 2679 continue; 2680 2681 if ((dirp = opendir(dirname)) == NULL) 2682 continue; 2683 2684 while ((dir = readdir(dirp)) != NULL) { 2685 char nbuf[MAXPATHLEN]; 2686 2687 if (recvurg) { 2688 myoob(); 2689 recvurg = 0; 2690 transflag = 0; 2691 goto out; 2692 } 2693 2694 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2695 continue; 2696 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2697 dir->d_namlen == 2) 2698 continue; 2699 2700 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 2701 dir->d_name); 2702 2703 /* 2704 * We have to do a stat to insure it's 2705 * not a directory or special file. 2706 */ 2707 if (simple || (stat(nbuf, &st) == 0 && 2708 S_ISREG(st.st_mode))) { 2709 if (dout == NULL) { 2710 dout = dataconn("file list", (off_t)-1, 2711 "w"); 2712 if (dout == NULL) 2713 goto out; 2714 transflag++; 2715 } 2716 if (nbuf[0] == '.' && nbuf[1] == '/') 2717 fprintf(dout, "%s%s\n", &nbuf[2], 2718 type == TYPE_A ? "\r" : ""); 2719 else 2720 fprintf(dout, "%s%s\n", nbuf, 2721 type == TYPE_A ? "\r" : ""); 2722 byte_count += strlen(nbuf) + 1; 2723 } 2724 } 2725 (void) closedir(dirp); 2726 } 2727 2728 if (dout == NULL) 2729 reply(550, "No files found."); 2730 else if (ferror(dout) != 0) 2731 perror_reply(550, "Data connection"); 2732 else 2733 reply(226, "Transfer complete."); 2734 2735 transflag = 0; 2736 if (dout != NULL) 2737 (void) fclose(dout); 2738 else { 2739 if (pdata >= 0) 2740 close(pdata); 2741 } 2742 data = -1; 2743 pdata = -1; 2744out: 2745 if (freeglob) { 2746 freeglob = 0; 2747 globfree(&gl); 2748 } 2749} 2750 2751/*ARGSUSED*/ 2752static void 2753reapchild(int signo) 2754{ 2755 int save_errno = errno; 2756 int rval; 2757 2758 do { 2759 rval = waitpid(-1, NULL, WNOHANG); 2760 } while (rval > 0 || (rval == -1 && errno == EINTR)); 2761 errno = save_errno; 2762} 2763 2764void 2765logxfer(char *name, off_t size, time_t start) 2766{ 2767 char buf[400 + MAXHOSTNAMELEN*4 + MAXPATHLEN*4]; 2768 char dir[MAXPATHLEN], path[MAXPATHLEN], rpath[MAXPATHLEN]; 2769 char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; 2770 char *vpw; 2771 time_t now; 2772 int len; 2773 2774 if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) { 2775 time(&now); 2776 2777 vpw = malloc(strlen(guest ? guestpw : pw->pw_name) * 4 + 1); 2778 if (vpw == NULL) 2779 return; 2780 2781 snprintf(path, sizeof(path), "%s/%s", dir, name); 2782 if (realpath(path, rpath) == NULL) 2783 strlcpy(rpath, path, sizeof(rpath)); 2784 strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH); 2785 2786 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2787 strvis(vpw, guest? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2788 2789 len = snprintf(buf, sizeof(buf), 2790 "%.24s %d %s %qd %s %c %s %c %c %s ftp %d %s %s\n", 2791 ctime(&now), now - start + (now == start), 2792 vremotehost, (long long)size, vpath, 2793 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2794 'o', ((guest) ? 'a' : 'r'), 2795 vpw, 0 /* none yet */, 2796 ((guest) ? "*" : pw->pw_name), dhostname); 2797 free(vpw); 2798 2799 if (len >= sizeof(buf) || len == -1) { 2800 if ((len = strlen(buf)) == 0) 2801 return; /* should not happen */ 2802 buf[len - 1] = '\n'; 2803 } 2804 write(statfd, buf, len); 2805 } 2806} 2807 2808void 2809set_slave_signals(void) 2810{ 2811 struct sigaction sa; 2812 2813 sigemptyset(&sa.sa_mask); 2814 sa.sa_flags = SA_RESTART; 2815 2816 sa.sa_handler = SIG_DFL; 2817 (void) sigaction(SIGCHLD, &sa, NULL); 2818 2819 sa.sa_handler = sigurg; 2820 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 2821 (void) sigaction(SIGURG, &sa, NULL); 2822 2823 sigfillset(&sa.sa_mask); /* block all signals in handler */ 2824 sa.sa_flags = SA_RESTART; 2825 sa.sa_handler = sigquit; 2826 (void) sigaction(SIGHUP, &sa, NULL); 2827 (void) sigaction(SIGINT, &sa, NULL); 2828 (void) sigaction(SIGQUIT, &sa, NULL); 2829 (void) sigaction(SIGTERM, &sa, NULL); 2830 2831 sa.sa_handler = lostconn; 2832 (void) sigaction(SIGPIPE, &sa, NULL); 2833 2834 sa.sa_handler = toolong; 2835 (void) sigaction(SIGALRM, &sa, NULL); 2836 2837#ifdef F_SETOWN 2838 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 2839 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 2840#endif 2841} 2842 2843#if defined(TCPWRAPPERS) 2844static int 2845check_host(struct sockaddr *sa) 2846{ 2847 struct sockaddr_in *sin; 2848 struct hostent *hp; 2849 char *addr; 2850 2851 if (sa->sa_family != AF_INET) 2852 return 1; /*XXX*/ 2853 2854 sin = (struct sockaddr_in *)sa; 2855 hp = gethostbyaddr((char *)&sin->sin_addr, 2856 sizeof(struct in_addr), AF_INET); 2857 addr = inet_ntoa(sin->sin_addr); 2858 if (hp) { 2859 if (!hosts_ctl("ftpd", hp->h_name, addr, STRING_UNKNOWN)) { 2860 syslog(LOG_NOTICE, "tcpwrappers rejected: %s [%s]", 2861 hp->h_name, addr); 2862 return (0); 2863 } 2864 } else { 2865 if (!hosts_ctl("ftpd", STRING_UNKNOWN, addr, STRING_UNKNOWN)) { 2866 syslog(LOG_NOTICE, "tcpwrappers rejected: [%s]", addr); 2867 return (0); 2868 } 2869 } 2870 return (1); 2871} 2872#endif /* TCPWRAPPERS */ 2873 2874/* 2875 * Allocate space and return a copy of the specified dir. 2876 * If 'dir' begins with a tilde (~), expand it. 2877 */ 2878char * 2879copy_dir(char *dir, struct passwd *pw) 2880{ 2881 char *cp; 2882 char *newdir; 2883 char *user = NULL; 2884 2885 /* Nothing to expand */ 2886 if (dir[0] != '~') 2887 return (strdup(dir)); 2888 2889 /* "dir" is of form ~user/some/dir, lookup user. */ 2890 if (dir[1] != '/' && dir[1] != '\0') { 2891 if ((cp = strchr(dir + 1, '/')) == NULL) 2892 cp = dir + strlen(dir); 2893 if ((user = malloc((size_t)(cp - dir))) == NULL) 2894 return (NULL); 2895 strlcpy(user, dir + 1, (size_t)(cp - dir)); 2896 2897 /* Only do lookup if it is a different user. */ 2898 if (strcmp(user, pw->pw_name) != 0) { 2899 if ((pw = getpwnam(user)) == NULL) { 2900 /* No such user, interpret literally */ 2901 free(user); 2902 return(strdup(dir)); 2903 } 2904 } 2905 free(user); 2906 } 2907 2908 /* 2909 * If there is no directory separator (/) then it is just pw_dir. 2910 * Otherwise, replace ~foo with pw_dir. 2911 */ 2912 if ((cp = strchr(dir + 1, '/')) == NULL) { 2913 newdir = strdup(pw->pw_dir); 2914 } else { 2915 if (asprintf(&newdir, "%s%s", pw->pw_dir, cp) == -1) 2916 return (NULL); 2917 } 2918 2919 return(newdir); 2920} 2921