ftpd.c revision 1.185
1/* $OpenBSD: ftpd.c,v 1.185 2008/09/30 16:16:21 deraadt 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 1.185 2008/09/30 16:16:21 deraadt 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 "monitor.h" 126#include "extern.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 line[LINE_MAX]; 286 FILE *fp; 287 struct hostent *hp; 288 struct sigaction sa; 289 int error = 0; 290 const char *errstr; 291 292 tzset(); /* in case no timezone database in ~ftp */ 293 sigfillset(&allsigs); /* used to block signals while root */ 294 sigemptyset(&sa.sa_mask); 295 sa.sa_flags = SA_RESTART; 296 297 while ((ch = getopt(argc, argv, argstr)) != -1) { 298 switch (ch) { 299 case 'A': 300 anon_only = 1; 301 break; 302 303 case 'd': 304 case 'v': /* deprecated */ 305 debug = 1; 306 break; 307 308 case 'D': 309 daemon_mode = 1; 310 break; 311 312 case 'P': 313 portcheck = 0; 314 break; 315 316 case 'h': /* deprecated */ 317 break; 318 319 case 'l': 320 logging++; /* > 1 == extra logging */ 321 break; 322 323 case 'M': 324 multihome = 1; 325 break; 326 327 case 'n': 328 anon_ok = 0; 329 break; 330 331 case 'S': 332 stats = 1; 333 break; 334 335 case 't': 336 timeout = strtonum(optarg, 0, INT_MAX, &errstr); 337 if (errstr) { 338 syslog(LOG_ERR, 339 "%s is a bad value for -t, aborting", 340 optarg); 341 exit(2); 342 } 343 if (maxtimeout < timeout) 344 maxtimeout = timeout; 345 break; 346 347 case 'T': 348 maxtimeout = strtonum(optarg, 0, INT_MAX, 349 &errstr); 350 if (errstr) { 351 syslog(LOG_ERR, 352 "%s is a bad value for -T, aborting", 353 optarg); 354 exit(2); 355 } 356 if (timeout > maxtimeout) 357 timeout = maxtimeout; 358 break; 359 360 case 'u': 361 { 362 long val = 0; 363 char *p; 364 umaskchange = 0; 365 366 val = strtol(optarg, &p, 8); 367 if (*optarg == '\0' || *p != '\0' || val < 0 || 368 (val & ~ACCESSPERMS)) { 369 syslog(LOG_ERR, 370 "%s is a bad value for -u, aborting", 371 optarg); 372 exit(2); 373 } 374 defumask = val; 375 break; 376 } 377 378 case 'U': 379 doutmp = 1; 380 break; 381 382 case '4': 383 family = AF_INET; 384 break; 385 386 case '6': 387 family = AF_INET6; 388 break; 389 390 default: 391 usage(); 392 break; 393 } 394 } 395 396 (void) freopen(_PATH_DEVNULL, "w", stderr); 397 398 /* 399 * LOG_NDELAY sets up the logging connection immediately, 400 * necessary for anonymous ftp's that chroot and can't do it later. 401 */ 402 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 403 404 if (getpwnam(FTPD_PRIVSEP_USER) == NULL) { 405 syslog(LOG_ERR, "privilege separation user %s not found", 406 FTPD_PRIVSEP_USER); 407 exit(1); 408 } 409 endpwent(); 410 411 if (daemon_mode) { 412 int *fds, i, fd; 413 struct pollfd *pfds; 414 struct addrinfo hints, *res, *res0; 415 nfds_t n; 416 417 /* 418 * Detach from parent. 419 */ 420 if (daemon(1, 1) < 0) { 421 syslog(LOG_ERR, "failed to become a daemon"); 422 exit(1); 423 } 424 sa.sa_handler = reapchild; 425 (void) sigaction(SIGCHLD, &sa, NULL); 426 427 memset(&hints, 0, sizeof(hints)); 428 hints.ai_family = family; 429 hints.ai_socktype = SOCK_STREAM; 430 hints.ai_protocol = IPPROTO_TCP; 431 hints.ai_flags = AI_PASSIVE; 432 error = getaddrinfo(NULL, "ftp", &hints, &res0); 433 if (error) { 434 syslog(LOG_ERR, "%s", gai_strerror(error)); 435 exit(1); 436 } 437 438 n = 0; 439 for (res = res0; res; res = res->ai_next) 440 n++; 441 442 fds = calloc(n, sizeof(int)); 443 pfds = calloc(n, sizeof(struct pollfd)); 444 if (!fds || !pfds) { 445 syslog(LOG_ERR, "%s", strerror(errno)); 446 exit(1); 447 } 448 449 /* 450 * Open sockets, bind it to the FTP port, and start 451 * listening. 452 */ 453 n = 0; 454 for (res = res0; res; res = res->ai_next) { 455 fds[n] = socket(res->ai_family, res->ai_socktype, 456 res->ai_protocol); 457 if (fds[n] < 0) 458 continue; 459 460 if (setsockopt(fds[n], SOL_SOCKET, SO_REUSEADDR, 461 &on, sizeof(on)) < 0) { 462 close(fds[n]); 463 fds[n] = -1; 464 continue; 465 } 466 467 if (bind(fds[n], res->ai_addr, res->ai_addrlen) < 0) { 468 close(fds[n]); 469 fds[n] = -1; 470 continue; 471 } 472 if (listen(fds[n], 32) < 0) { 473 close(fds[n]); 474 fds[n] = -1; 475 continue; 476 } 477 478 pfds[n].fd = fds[n]; 479 pfds[n].events = POLLIN; 480 n++; 481 } 482 freeaddrinfo(res0); 483 484 if (n == 0) { 485 syslog(LOG_ERR, "could not open control socket"); 486 exit(1); 487 } 488 489 /* Stash pid in pidfile */ 490 if (pidfile(NULL)) 491 syslog(LOG_ERR, "can't open pidfile: %m"); 492 /* 493 * Loop forever accepting connection requests and forking off 494 * children to handle them. 495 */ 496 while (1) { 497 if (poll(pfds, n, INFTIM) < 0) { 498 if (errno == EINTR) 499 continue; 500 syslog(LOG_ERR, "poll: %m"); 501 exit(1); 502 } 503 for (i = 0; i < n; i++) 504 if (pfds[i].revents & POLLIN) { 505 addrlen = sizeof(his_addr); 506 fd = accept(pfds[i].fd, 507 (struct sockaddr *)&his_addr, 508 &addrlen); 509 if (fd != -1) { 510 if (fork() == 0) 511 goto child; 512 close(fd); 513 } 514 } 515 } 516 517 child: 518 /* child */ 519 (void)dup2(fd, STDIN_FILENO); 520 (void)dup2(fd, STDOUT_FILENO); 521 for (i = 0; i < n; i++) 522 close(fds[i]); 523#if defined(TCPWRAPPERS) 524 /* ..in the child. */ 525 if (!check_host((struct sockaddr *)&his_addr)) 526 exit(1); 527#endif /* TCPWRAPPERS */ 528 } else { 529 addrlen = sizeof(his_addr); 530 if (getpeername(0, (struct sockaddr *)&his_addr, 531 &addrlen) < 0) { 532 /* syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); */ 533 exit(1); 534 } 535 } 536 537 /* set this here so klogin can use it... */ 538 (void)snprintf(ttyline, sizeof(ttyline), "ftp%ld", (long)getpid()); 539 540 set_slave_signals(); 541 542 addrlen = sizeof(ctrl_addr); 543 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 544 syslog(LOG_ERR, "getsockname: %m"); 545 exit(1); 546 } 547 if (his_addr.su_family == AF_INET6 && 548 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 549#if 1 550 /* 551 * IPv4 control connection arrived to AF_INET6 socket. 552 * I hate to do this, but this is the easiest solution. 553 */ 554 union sockunion tmp_addr; 555 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 556 557 tmp_addr = his_addr; 558 memset(&his_addr, 0, sizeof(his_addr)); 559 his_addr.su_sin.sin_family = AF_INET; 560 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 561 memcpy(&his_addr.su_sin.sin_addr, 562 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 563 sizeof(his_addr.su_sin.sin_addr)); 564 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 565 566 tmp_addr = ctrl_addr; 567 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 568 ctrl_addr.su_sin.sin_family = AF_INET; 569 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 570 memcpy(&ctrl_addr.su_sin.sin_addr, 571 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 572 sizeof(ctrl_addr.su_sin.sin_addr)); 573 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 574#else 575 while (fgets(line, sizeof(line), fd) != NULL) { 576 line[strcspn(line, "\n")] = '\0'; 577 lreply(530, "%s", line); 578 } 579 (void) fflush(stdout); 580 (void) close(fd); 581 reply(530, 582 "Connection from IPv4 mapped address is not supported."); 583 exit(0); 584#endif 585 } 586#ifdef IP_TOS 587 if (his_addr.su_family == AF_INET) { 588 tos = IPTOS_LOWDELAY; 589 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, 590 sizeof(int)) < 0) 591 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 592 } 593#endif 594 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 595 596 /* Try to handle urgent data inline */ 597#ifdef SO_OOBINLINE 598 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 599 syslog(LOG_ERR, "setsockopt: %m"); 600#endif 601 602 dolog((struct sockaddr *)&his_addr); 603 604 /* 605 * Set up default state 606 */ 607 data = -1; 608 type = TYPE_A; 609 form = FORM_N; 610 stru = STRU_F; 611 mode = MODE_S; 612 tmpline[0] = '\0'; 613 614 /* If logins are disabled, print out the message. */ 615 if ((fp = fopen(_PATH_NOLOGIN, "r")) != NULL) { 616 while (fgets(line, sizeof(line), fp) != NULL) { 617 line[strcspn(line, "\n")] = '\0'; 618 lreply(530, "%s", line); 619 } 620 (void) fflush(stdout); 621 (void) fclose(fp); 622 reply(530, "System not available."); 623 exit(0); 624 } 625 if ((fp = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 626 while (fgets(line, sizeof(line), fp) != NULL) { 627 line[strcspn(line, "\n")] = '\0'; 628 lreply(220, "%s", line); 629 } 630 (void) fflush(stdout); 631 (void) fclose(fp); 632 /* reply(220,) must follow */ 633 } 634 (void) gethostname(hostname, sizeof(hostname)); 635 636 /* Make sure hostname is fully qualified. */ 637 hp = gethostbyname(hostname); 638 if (hp != NULL) 639 strlcpy(hostname, hp->h_name, sizeof(hostname)); 640 641 if (multihome) { 642 error = getnameinfo((struct sockaddr *)&ctrl_addr, 643 ctrl_addr.su_len, dhostname, sizeof(dhostname), NULL, 0, 0); 644 } 645 646 if (error != 0) 647 reply(220, "FTP server ready."); 648 else 649 reply(220, "%s FTP server ready.", 650 (multihome ? dhostname : hostname)); 651 652 monitor_init(); 653 654 for (;;) 655 (void) yyparse(); 656 /* NOTREACHED */ 657} 658 659/* 660 * Signal handlers. 661 */ 662/*ARGSUSED*/ 663static void 664lostconn(int signo) 665{ 666 struct syslog_data sdata = SYSLOG_DATA_INIT; 667 668 sdata.log_fac = LOG_FTP; 669 if (debug) 670 syslog_r(LOG_DEBUG, &sdata, "lost connection"); 671 dologout(1); 672} 673 674static void 675sigquit(int signo) 676{ 677 struct syslog_data sdata = SYSLOG_DATA_INIT; 678 679 sdata.log_fac = LOG_FTP; 680 syslog_r(LOG_DEBUG, &sdata, "got signal %s", sys_signame[signo]); 681 dologout(1); 682} 683 684/* 685 * Save the result of a getpwnam. Used for USER command, since 686 * the data returned must not be clobbered by any other command 687 * (e.g., globbing). 688 */ 689static struct passwd * 690sgetpwnam(char *name, struct passwd *pw) 691{ 692 static struct passwd *save; 693 struct passwd *old; 694 695 if (pw == NULL && (pw = getpwnam(name)) == NULL) 696 return (NULL); 697 old = save; 698 save = pw_dup(pw); 699 if (save == NULL) { 700 perror_reply(421, "Local resource failure: malloc"); 701 dologout(1); 702 /* NOTREACHED */ 703 } 704 if (old) { 705 memset(old->pw_passwd, 0, strlen(old->pw_passwd)); 706 free(old); 707 } 708 return (save); 709} 710 711static int login_attempts; /* number of failed login attempts */ 712static int askpasswd; /* had user command, ask for passwd */ 713static char curname[MAXLOGNAME]; /* current USER name */ 714 715/* 716 * USER command. 717 * Sets global passwd pointer pw if named account exists and is acceptable; 718 * sets askpasswd if a PASS command is expected. If logged in previously, 719 * need to reset state. If name is "ftp" or "anonymous", the name is not in 720 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 721 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 722 * requesting login privileges. Disallow anyone who does not have a standard 723 * shell as returned by getusershell(). Disallow anyone mentioned in the file 724 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 725 */ 726void 727user(char *name) 728{ 729 char *cp, *shell, *style, *host; 730 char *class = NULL; 731 732 if (logged_in) { 733 kill_slave("user already logged in"); 734 end_login(); 735 } 736 737 /* Close session from previous user if there was one. */ 738 if (as) { 739 auth_close(as); 740 as = NULL; 741 } 742 if (lc) { 743 login_close(lc); 744 lc = NULL; 745 } 746 747 if ((style = strchr(name, ':')) != NULL) 748 *style++ = 0; 749 750 guest = 0; 751 host = multihome ? dhostname : hostname; 752 if (anon_ok && 753 (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0)) { 754 if (checkuser(_PATH_FTPUSERS, "ftp") || 755 checkuser(_PATH_FTPUSERS, "anonymous")) 756 reply(530, "User %s access denied.", name); 757 else if ((pw = sgetpwnam("ftp", NULL)) != NULL) { 758 guest = 1; 759 askpasswd = 1; 760 lc = login_getclass(pw->pw_class); 761 if ((as = auth_open()) == NULL || 762 auth_setpwd(as, pw) != 0 || 763 auth_setoption(as, "FTPD_HOST", host) < 0) { 764 if (as) { 765 auth_close(as); 766 as = NULL; 767 } 768 login_close(lc); 769 lc = NULL; 770 reply(421, "Local resource failure"); 771 return; 772 } 773 reply(331, 774 "Guest login ok, send your email address as password."); 775 } else 776 reply(530, "User %s unknown.", name); 777 if (!askpasswd && logging) 778 syslog(LOG_NOTICE, 779 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 780 return; 781 } 782 783 shell = _PATH_BSHELL; 784 if ((pw = sgetpwnam(name, NULL))) { 785 class = pw->pw_class; 786 if (pw->pw_shell != NULL && *pw->pw_shell != '\0') 787 shell = pw->pw_shell; 788 while ((cp = getusershell()) != NULL) 789 if (strcmp(cp, shell) == 0) 790 break; 791 shell = cp; 792 endusershell(); 793 } 794 795 /* Get login class; if invalid style treat like unknown user. */ 796 lc = login_getclass(class); 797 if (lc && (style = login_getstyle(lc, style, "auth-ftp")) == NULL) { 798 login_close(lc); 799 lc = NULL; 800 pw = NULL; 801 } 802 803 /* Do pre-authentication setup. */ 804 if (lc && ((as = auth_open()) == NULL || 805 (pw != NULL && auth_setpwd(as, pw) != 0) || 806 auth_setitem(as, AUTHV_STYLE, style) < 0 || 807 auth_setitem(as, AUTHV_NAME, name) < 0 || 808 auth_setitem(as, AUTHV_CLASS, class) < 0 || 809 auth_setoption(as, "login", "yes") < 0 || 810 auth_setoption(as, "notickets", "yes") < 0 || 811 auth_setoption(as, "FTPD_HOST", host) < 0)) { 812 if (as) { 813 auth_close(as); 814 as = NULL; 815 } 816 login_close(lc); 817 lc = NULL; 818 reply(421, "Local resource failure"); 819 return; 820 } 821 if (logging) 822 strlcpy(curname, name, sizeof(curname)); 823 824 dochroot = (lc && login_getcapbool(lc, "ftp-chroot", 0)) || 825 checkuser(_PATH_FTPCHROOT, name); 826 if (anon_only && !dochroot) { 827 reply(530, "User %s access denied.", name); 828 return; 829 } 830 if (pw) { 831 if ((!shell && !dochroot) || checkuser(_PATH_FTPUSERS, name)) { 832 reply(530, "User %s access denied.", name); 833 if (logging) 834 syslog(LOG_NOTICE, 835 "FTP LOGIN REFUSED FROM %s, %s", 836 remotehost, name); 837 pw = NULL; 838 return; 839 } 840 } 841 842 if (as != NULL && (cp = auth_challenge(as)) != NULL) 843 reply(331, "%s", cp); 844 else 845 reply(331, "Password required for %s.", name); 846 847 askpasswd = 1; 848 /* 849 * Delay before reading passwd after first failed 850 * attempt to slow down passwd-guessing programs. 851 */ 852 if (login_attempts) 853 sleep((unsigned) login_attempts); 854} 855 856/* 857 * Check if a user is in the file "fname" 858 */ 859static int 860checkuser(char *fname, char *name) 861{ 862 FILE *fp; 863 int found = 0; 864 char *p, line[BUFSIZ]; 865 866 if ((fp = fopen(fname, "r")) != NULL) { 867 while (fgets(line, sizeof(line), fp) != NULL) 868 if ((p = strchr(line, '\n')) != NULL) { 869 *p = '\0'; 870 if (line[0] == '#') 871 continue; 872 if (strcmp(line, name) == 0) { 873 found = 1; 874 break; 875 } 876 } 877 (void) fclose(fp); 878 } 879 return (found); 880} 881 882/* 883 * Terminate login as previous user, if any, resetting state; 884 * used when USER command is given or login fails. 885 */ 886static void 887end_login(void) 888{ 889 sigprocmask (SIG_BLOCK, &allsigs, NULL); 890 if (logged_in) { 891 ftpdlogwtmp(ttyline, "", ""); 892 if (doutmp) 893 ftpd_logout(utmp.ut_line); 894 } 895 reply(530, "Please reconnect to work as another user"); 896 _exit(0); 897} 898 899enum auth_ret 900pass(char *passwd) 901{ 902 int authok; 903 unsigned int flags; 904 FILE *fp; 905 static char homedir[MAXPATHLEN]; 906 char *motd, *dir, rootdir[MAXPATHLEN]; 907 size_t sz_pw_dir; 908 909 if (logged_in || askpasswd == 0) { 910 reply(503, "Login with USER first."); 911 return (AUTH_FAILED); 912 } 913 askpasswd = 0; 914 if (!guest) { /* "ftp" is only account allowed no password */ 915 authok = 0; 916 if (pw == NULL || pw->pw_passwd[0] == '\0') { 917 useconds_t us; 918 919 /* Sleep between 1 and 3 seconds to emulate a crypt. */ 920 us = arc4random_uniform(3000000); 921 usleep(us); 922 if (as != NULL) { 923 auth_close(as); 924 as = NULL; 925 } 926 } else { 927 authok = auth_userresponse(as, passwd, 0); 928 as = NULL; 929 } 930 if (authok == 0) { 931 reply(530, "Login incorrect."); 932 if (logging) 933 syslog(LOG_NOTICE, 934 "FTP LOGIN FAILED FROM %s, %s", 935 remotehost, curname); 936 pw = NULL; 937 if (login_attempts++ >= 5) { 938 syslog(LOG_NOTICE, 939 "repeated login failures from %s", 940 remotehost); 941 kill_slave("repeated login failures"); 942 _exit(0); 943 } 944 return (AUTH_FAILED); 945 } 946 } else if (lc != NULL) { 947 /* Save anonymous' password. */ 948 if (guestpw != NULL) 949 free(guestpw); 950 guestpw = strdup(passwd); 951 if (guestpw == NULL) { 952 kill_slave("out of mem"); 953 fatal("Out of memory."); 954 } 955 956 authok = auth_approval(as, lc, pw->pw_name, "ftp"); 957 auth_close(as); 958 as = NULL; 959 if (authok == 0) { 960 syslog(LOG_INFO|LOG_AUTH, 961 "FTP LOGIN FAILED (HOST) as %s: approval failure.", 962 pw->pw_name); 963 reply(530, "Approval failure."); 964 kill_slave("approval failure"); 965 _exit(0); 966 } 967 } else { 968 syslog(LOG_INFO|LOG_AUTH, 969 "FTP LOGIN CLASS %s MISSING for %s: approval failure.", 970 pw->pw_class, pw->pw_name); 971 reply(530, "Permission denied."); 972 kill_slave("permission denied"); 973 _exit(0); 974 } 975 976 if (monitor_post_auth() == 1) { 977 /* Post-auth monitor process */ 978 logged_in = 1; 979 return (AUTH_MONITOR); 980 } 981 982 login_attempts = 0; /* this time successful */ 983 /* set umask via setusercontext() unless -u flag was given. */ 984 flags = LOGIN_SETGROUP|LOGIN_SETPRIORITY|LOGIN_SETRESOURCES; 985 if (umaskchange) 986 flags |= LOGIN_SETUMASK; 987 else 988 (void) umask(defumask); 989 if (setusercontext(lc, pw, (uid_t)0, flags) != 0) { 990 perror_reply(451, "Local resource failure: setusercontext"); 991 syslog(LOG_NOTICE, "setusercontext: %m"); 992 dologout(1); 993 /* NOTREACHED */ 994 } 995 996 /* open wtmp before chroot */ 997 ftpdlogwtmp(ttyline, pw->pw_name, remotehost); 998 999 /* open utmp before chroot */ 1000 if (doutmp) { 1001 memset((void *)&utmp, 0, sizeof(utmp)); 1002 (void)time(&utmp.ut_time); 1003 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 1004 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 1005 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 1006 ftpd_login(&utmp); 1007 } 1008 1009 /* open stats file before chroot */ 1010 if (guest && (stats == 1) && (statfd < 0)) 1011 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1012 stats = 0; 1013 1014 logged_in = 1; 1015 1016 if ((dir = login_getcapstr(lc, "ftp-dir", NULL, NULL))) { 1017 char *newdir; 1018 1019 newdir = copy_dir(dir, pw); 1020 if (newdir == NULL) { 1021 perror_reply(421, "Local resource failure: malloc"); 1022 dologout(1); 1023 /* NOTREACHED */ 1024 } 1025 pw->pw_dir = newdir; 1026 pw = sgetpwnam(NULL, pw); 1027 free(dir); 1028 free(newdir); 1029 } 1030 1031 /* make sure pw->pw_dir is big enough to hold "/" */ 1032 sz_pw_dir = strlen(pw->pw_dir) + 1; 1033 if (sz_pw_dir < 2) { 1034 pw->pw_dir = "/"; 1035 pw = sgetpwnam(NULL, pw); 1036 sz_pw_dir = 2; 1037 } 1038 1039 if (guest || dochroot) { 1040 if (multihome && guest) { 1041 struct stat ts; 1042 1043 /* Compute root directory. */ 1044 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1045 pw->pw_dir, dhostname); 1046 if (stat(rootdir, &ts) < 0) { 1047 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1048 pw->pw_dir, hostname); 1049 } 1050 } else 1051 strlcpy(rootdir, pw->pw_dir, sizeof(rootdir)); 1052 } 1053 if (guest) { 1054 /* 1055 * We MUST do a chdir() after the chroot. Otherwise 1056 * the old current directory will be accessible as "." 1057 * outside the new root! 1058 */ 1059 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1060 reply(550, "Can't set guest privileges."); 1061 goto bad; 1062 } 1063 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1064 if (setenv("HOME", "/", 1) == -1) { 1065 reply(550, "Can't setup environment."); 1066 goto bad; 1067 } 1068 } else if (dochroot) { 1069 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1070 reply(550, "Can't change root."); 1071 goto bad; 1072 } 1073 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1074 if (setenv("HOME", "/", 1) == -1) { 1075 reply(550, "Can't setup environment."); 1076 goto bad; 1077 } 1078 } else if (chdir(pw->pw_dir) < 0) { 1079 if (chdir("/") < 0) { 1080 reply(530, "User %s: can't change directory to %s.", 1081 pw->pw_name, pw->pw_dir); 1082 goto bad; 1083 } else 1084 lreply(230, "No directory! Logging in with home=/"); 1085 } 1086 if (setegid(pw->pw_gid) < 0 || setgid(pw->pw_gid) < 0) { 1087 reply(550, "Can't set gid."); 1088 goto bad; 1089 } 1090 if (seteuid(pw->pw_uid) < 0 || setuid(pw->pw_uid) < 0) { 1091 reply(550, "Can't set uid."); 1092 goto bad; 1093 } 1094 sigprocmask(SIG_UNBLOCK, &allsigs, NULL); 1095 1096 /* 1097 * Set home directory so that use of ~ (tilde) works correctly. 1098 */ 1099 if (getcwd(homedir, MAXPATHLEN) != NULL) { 1100 if (setenv("HOME", homedir, 1) == -1) { 1101 reply(550, "Can't setup environment."); 1102 goto bad; 1103 } 1104 } 1105 1106 /* 1107 * Display a login message, if it exists. 1108 * N.B. reply(230,) must follow the message. 1109 */ 1110 motd = login_getcapstr(lc, "welcome", NULL, NULL); 1111 if ((fp = fopen(motd ? motd : _PATH_FTPLOGINMESG, "r")) != NULL) { 1112 char line[LINE_MAX]; 1113 1114 while (fgets(line, sizeof(line), fp) != NULL) { 1115 line[strcspn(line, "\n")] = '\0'; 1116 lreply(230, "%s", line); 1117 } 1118 (void) fflush(stdout); 1119 (void) fclose(fp); 1120 } 1121 if (motd != NULL) 1122 free(motd); 1123 if (guest) { 1124 if (ident != NULL) 1125 free(ident); 1126 ident = strdup(passwd); 1127 if (ident == NULL) 1128 fatal("Ran out of memory."); 1129 reply(230, "Guest login ok, access restrictions apply."); 1130#ifdef HASSETPROCTITLE 1131 snprintf(proctitle, sizeof(proctitle), 1132 "%s: anonymous/%.*s", remotehost, 1133 (int)(sizeof(proctitle) - sizeof(remotehost) - 1134 sizeof(": anonymous/")), passwd); 1135 setproctitle("%s", proctitle); 1136#endif /* HASSETPROCTITLE */ 1137 if (logging) 1138 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1139 remotehost, passwd); 1140 } else { 1141 reply(230, "User %s logged in.", pw->pw_name); 1142#ifdef HASSETPROCTITLE 1143 snprintf(proctitle, sizeof(proctitle), 1144 "%s: %s", remotehost, pw->pw_name); 1145 setproctitle("%s", proctitle); 1146#endif /* HASSETPROCTITLE */ 1147 if (logging) 1148 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1149 remotehost, pw->pw_name); 1150 } 1151 login_close(lc); 1152 lc = NULL; 1153 return (AUTH_SLAVE); 1154bad: 1155 /* Forget all about it... */ 1156 login_close(lc); 1157 lc = NULL; 1158 end_login(); 1159 return (AUTH_FAILED); 1160} 1161 1162void 1163retrieve(char *cmd, char *name) 1164{ 1165 FILE *fin, *dout; 1166 struct stat st; 1167 int (*closefunc)(FILE *); 1168 time_t start; 1169 1170 if (cmd == 0) { 1171 fin = fopen(name, "r"), closefunc = fclose; 1172 st.st_size = 0; 1173 } else { 1174 char line[BUFSIZ]; 1175 1176 (void) snprintf(line, sizeof(line), cmd, name); 1177 name = line; 1178 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1179 st.st_size = -1; 1180 st.st_blksize = BUFSIZ; 1181 } 1182 if (fin == NULL) { 1183 if (errno != 0) { 1184 perror_reply(550, name); 1185 if (cmd == 0) { 1186 LOGCMD("get", name); 1187 } 1188 } 1189 return; 1190 } 1191 byte_count = -1; 1192 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1193 reply(550, "%s: not a plain file.", name); 1194 goto done; 1195 } 1196 if (restart_point) { 1197 if (type == TYPE_A) { 1198 off_t i, n; 1199 int c; 1200 1201 n = restart_point; 1202 i = 0; 1203 while (i++ < n) { 1204 if ((c = getc(fin)) == EOF) { 1205 if (ferror(fin)) { 1206 perror_reply(550, name); 1207 goto done; 1208 } else 1209 break; 1210 } 1211 if (c == '\n') 1212 i++; 1213 } 1214 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1215 perror_reply(550, name); 1216 goto done; 1217 } 1218 } 1219 dout = dataconn(name, st.st_size, "w"); 1220 if (dout == NULL) 1221 goto done; 1222 time(&start); 1223 send_data(fin, dout, (off_t)st.st_blksize, st.st_size, 1224 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 1225 if ((cmd == 0) && stats) 1226 logxfer(name, byte_count, start); 1227 (void) fclose(dout); 1228 data = -1; 1229done: 1230 if (pdata >= 0) 1231 (void) close(pdata); 1232 pdata = -1; 1233 if (cmd == 0) 1234 LOGBYTES("get", name, byte_count); 1235 (*closefunc)(fin); 1236} 1237 1238void 1239store(char *name, char *mode, int unique) 1240{ 1241 FILE *fout, *din; 1242 int (*closefunc)(FILE *); 1243 struct stat st; 1244 int fd; 1245 1246 if (restart_point && *mode != 'a') 1247 mode = "r+"; 1248 1249 if (unique && stat(name, &st) == 0) { 1250 char *nam; 1251 1252 fd = guniquefd(name, &nam); 1253 if (fd == -1) { 1254 LOGCMD(*mode == 'w' ? "put" : "append", name); 1255 return; 1256 } 1257 name = nam; 1258 fout = fdopen(fd, mode); 1259 } else 1260 fout = fopen(name, mode); 1261 1262 closefunc = fclose; 1263 if (fout == NULL) { 1264 perror_reply(553, name); 1265 LOGCMD(*mode == 'w' ? "put" : "append", name); 1266 return; 1267 } 1268 byte_count = -1; 1269 if (restart_point) { 1270 if (type == TYPE_A) { 1271 off_t i, n; 1272 int c; 1273 1274 n = restart_point; 1275 i = 0; 1276 while (i++ < n) { 1277 if ((c = getc(fout)) == EOF) { 1278 if (ferror(fout)) { 1279 perror_reply(550, name); 1280 goto done; 1281 } else 1282 break; 1283 } 1284 if (c == '\n') 1285 i++; 1286 } 1287 /* 1288 * We must do this seek to "current" position 1289 * because we are changing from reading to 1290 * writing. 1291 */ 1292 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1293 perror_reply(550, name); 1294 goto done; 1295 } 1296 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1297 perror_reply(550, name); 1298 goto done; 1299 } 1300 } 1301 din = dataconn(name, (off_t)-1, "r"); 1302 if (din == NULL) 1303 goto done; 1304 if (receive_data(din, fout) == 0) { 1305 if (unique) 1306 reply(226, "Transfer complete (unique file name:%s).", 1307 name); 1308 else 1309 reply(226, "Transfer complete."); 1310 } 1311 (void) fclose(din); 1312 data = -1; 1313 pdata = -1; 1314done: 1315 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1316 (*closefunc)(fout); 1317} 1318 1319static FILE * 1320getdatasock(char *mode) 1321{ 1322 int on = 1, s, t, tries; 1323 1324 if (data >= 0) 1325 return (fdopen(data, mode)); 1326 sigprocmask (SIG_BLOCK, &allsigs, NULL); 1327 s = monitor_socket(ctrl_addr.su_family); 1328 if (s < 0) 1329 goto bad; 1330 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1331 &on, sizeof(on)) < 0) 1332 goto bad; 1333 /* anchor socket to avoid multi-homing problems */ 1334 data_source = ctrl_addr; 1335 data_source.su_port = htons(20); /* ftp-data port */ 1336 for (tries = 1; ; tries++) { 1337 if (monitor_bind(s, (struct sockaddr *)&data_source, 1338 data_source.su_len) >= 0) 1339 break; 1340 if (errno != EADDRINUSE || tries > 10) 1341 goto bad; 1342 sleep((unsigned int)tries); 1343 } 1344 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1345 1346#ifdef IP_TOS 1347 if (ctrl_addr.su_family == AF_INET) { 1348 on = IPTOS_THROUGHPUT; 1349 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, 1350 sizeof(int)) < 0) 1351 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1352 } 1353#endif 1354#ifdef TCP_NOPUSH 1355 /* 1356 * Turn off push flag to keep sender TCP from sending short packets 1357 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1358 * to set the send buffer size as well, but that may not be desirable 1359 * in heavy-load situations. 1360 */ 1361 on = 1; 1362 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof(on)) < 0) 1363 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1364#endif 1365#ifdef SO_SNDBUF 1366 on = 65536; 1367 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof(on)) < 0) 1368 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1369#endif 1370 1371 return (fdopen(s, mode)); 1372bad: 1373 /* Return the real value of errno (close may change it) */ 1374 t = errno; 1375 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1376 if (s >= 0) 1377 (void) close(s); 1378 errno = t; 1379 return (NULL); 1380} 1381 1382static FILE * 1383dataconn(char *name, off_t size, char *mode) 1384{ 1385 char sizebuf[32]; 1386 FILE *file = NULL; 1387 int retry = 0; 1388 in_port_t *p; 1389 u_char *fa, *ha; 1390 size_t alen; 1391 int error; 1392 1393 file_size = size; 1394 byte_count = 0; 1395 if (size != (off_t) -1) { 1396 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1397 size); 1398 } else 1399 sizebuf[0] = '\0'; 1400 if (pdata >= 0) { 1401 union sockunion from; 1402 int s; 1403 socklen_t fromlen = sizeof(from); 1404 1405 (void) alarm ((unsigned) timeout); 1406 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1407 (void) alarm (0); 1408 if (s < 0) { 1409 reply(425, "Can't open data connection."); 1410 (void) close(pdata); 1411 pdata = -1; 1412 return (NULL); 1413 } 1414 switch (from.su_family) { 1415 case AF_INET: 1416 p = (in_port_t *)&from.su_sin.sin_port; 1417 fa = (u_char *)&from.su_sin.sin_addr; 1418 ha = (u_char *)&his_addr.su_sin.sin_addr; 1419 alen = sizeof(struct in_addr); 1420 break; 1421 case AF_INET6: 1422 p = (in_port_t *)&from.su_sin6.sin6_port; 1423 fa = (u_char *)&from.su_sin6.sin6_addr; 1424 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1425 alen = sizeof(struct in6_addr); 1426 break; 1427 default: 1428 reply(425, "Can't build data connection: " 1429 "unknown address family"); 1430 (void) close(pdata); 1431 (void) close(s); 1432 pdata = -1; 1433 return (NULL); 1434 } 1435 if (from.su_family != his_addr.su_family || 1436 ntohs(*p) < IPPORT_RESERVED) { 1437 reply(425, "Can't build data connection: " 1438 "address family or port error"); 1439 (void) close(pdata); 1440 (void) close(s); 1441 pdata = -1; 1442 return (NULL); 1443 } 1444 if (portcheck && memcmp(fa, ha, alen) != 0) { 1445 reply(435, "Can't build data connection: " 1446 "illegal port number"); 1447 (void) close(pdata); 1448 (void) close(s); 1449 pdata = -1; 1450 return (NULL); 1451 } 1452 (void) close(pdata); 1453 pdata = s; 1454 reply(150, "Opening %s mode data connection for '%s'%s.", 1455 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1456 return (fdopen(pdata, mode)); 1457 } 1458 if (data >= 0) { 1459 reply(125, "Using existing data connection for '%s'%s.", 1460 name, sizebuf); 1461 usedefault = 1; 1462 return (fdopen(data, mode)); 1463 } 1464 if (usedefault) 1465 data_dest = his_addr; 1466 usedefault = 1; 1467 do { 1468 if (file != NULL) 1469 (void) fclose(file); 1470 file = getdatasock(mode); 1471 if (file == NULL) { 1472 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1473 1474 error = getnameinfo((struct sockaddr *)&data_source, 1475 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 1476 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV); 1477 if (error != 0) 1478 reply(425, "Can't create data socket: %s.", 1479 strerror(errno)); 1480 else 1481 reply(425, 1482 "Can't create data socket (%s,%s): %s.", 1483 hbuf, pbuf, strerror(errno)); 1484 return (NULL); 1485 } 1486 1487 /* 1488 * attempt to connect to reserved port on client machine; 1489 * this looks like an attack 1490 */ 1491 switch (data_dest.su_family) { 1492 case AF_INET: 1493 p = (in_port_t *)&data_dest.su_sin.sin_port; 1494 fa = (u_char *)&data_dest.su_sin.sin_addr; 1495 ha = (u_char *)&his_addr.su_sin.sin_addr; 1496 alen = sizeof(struct in_addr); 1497 break; 1498 case AF_INET6: 1499 p = (in_port_t *)&data_dest.su_sin6.sin6_port; 1500 fa = (u_char *)&data_dest.su_sin6.sin6_addr; 1501 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1502 alen = sizeof(struct in6_addr); 1503 break; 1504 default: 1505 reply(425, "Can't build data connection: " 1506 "unknown address family"); 1507 (void) fclose(file); 1508 pdata = -1; 1509 return (NULL); 1510 } 1511 if (data_dest.su_family != his_addr.su_family || 1512 ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */ 1513 reply(425, "Can't build data connection: " 1514 "address family or port error"); 1515 (void) fclose(file); 1516 return NULL; 1517 } 1518 if (portcheck && memcmp(fa, ha, alen) != 0) { 1519 reply(435, "Can't build data connection: " 1520 "illegal port number"); 1521 (void) fclose(file); 1522 return NULL; 1523 } 1524 1525 if (connect(fileno(file), (struct sockaddr *)&data_dest, 1526 data_dest.su_len) == 0) { 1527 reply(150, "Opening %s mode data connection for '%s'%s.", 1528 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1529 data = fileno(file); 1530 return (file); 1531 } 1532 if (errno != EADDRINUSE) 1533 break; 1534 sleep((unsigned) swaitint); 1535 retry += swaitint; 1536 } while (retry <= swaitmax); 1537 perror_reply(425, "Can't build data connection"); 1538 (void) fclose(file); 1539 return (NULL); 1540} 1541 1542/* 1543 * Transfer the contents of "instr" to "outstr" peer using the appropriate 1544 * encapsulation of the data subject to Mode, Structure, and Type. 1545 * 1546 * NB: Form isn't handled. 1547 */ 1548static int 1549send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1550{ 1551 int c, cnt, filefd, netfd; 1552 char *buf, *bp; 1553 size_t len; 1554 1555 transflag++; 1556 switch (type) { 1557 1558 case TYPE_A: 1559 while ((c = getc(instr)) != EOF) { 1560 if (recvurg) 1561 goto got_oob; 1562 byte_count++; 1563 if (c == '\n') { 1564 if (ferror(outstr)) 1565 goto data_err; 1566 (void) putc('\r', outstr); 1567 } 1568 (void) putc(c, outstr); 1569 } 1570 fflush(outstr); 1571 transflag = 0; 1572 if (ferror(instr)) 1573 goto file_err; 1574 if (ferror(outstr)) 1575 goto data_err; 1576 reply(226, "Transfer complete."); 1577 return(0); 1578 1579 case TYPE_I: 1580 case TYPE_L: 1581 /* 1582 * isreg is only set if we are not doing restart and we 1583 * are sending a regular file 1584 */ 1585 netfd = fileno(outstr); 1586 filefd = fileno(instr); 1587 1588 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1589 size_t fsize = (size_t)filesize; 1590 1591 buf = mmap(0, fsize, PROT_READ, MAP_SHARED, filefd, 1592 (off_t)0); 1593 if (buf == MAP_FAILED) { 1594 syslog(LOG_WARNING, "mmap(%llu): %m", 1595 (unsigned long long)fsize); 1596 goto oldway; 1597 } 1598 bp = buf; 1599 len = fsize; 1600 do { 1601 cnt = write(netfd, bp, len); 1602 if (recvurg) { 1603 munmap(buf, fsize); 1604 goto got_oob; 1605 } 1606 len -= cnt; 1607 bp += cnt; 1608 if (cnt > 0) 1609 byte_count += cnt; 1610 } while(cnt > 0 && len > 0); 1611 1612 transflag = 0; 1613 munmap(buf, fsize); 1614 if (cnt < 0) 1615 goto data_err; 1616 reply(226, "Transfer complete."); 1617 return(0); 1618 } 1619 1620oldway: 1621 if ((buf = malloc((size_t)blksize)) == NULL) { 1622 transflag = 0; 1623 perror_reply(451, "Local resource failure: malloc"); 1624 return(-1); 1625 } 1626 1627 while ((cnt = read(filefd, buf, (size_t)blksize)) > 0 && 1628 write(netfd, buf, cnt) == cnt) 1629 byte_count += cnt; 1630 transflag = 0; 1631 (void)free(buf); 1632 if (cnt != 0) { 1633 if (cnt < 0) 1634 goto file_err; 1635 goto data_err; 1636 } 1637 reply(226, "Transfer complete."); 1638 return(0); 1639 default: 1640 transflag = 0; 1641 reply(550, "Unimplemented TYPE %d in send_data", type); 1642 return(-1); 1643 } 1644 1645data_err: 1646 transflag = 0; 1647 reply(426, "Data connection"); 1648 return(-1); 1649 1650file_err: 1651 transflag = 0; 1652 reply(551, "Error on input file"); 1653 return(-1); 1654 1655got_oob: 1656 myoob(); 1657 recvurg = 0; 1658 transflag = 0; 1659 return(-1); 1660} 1661 1662/* 1663 * Transfer data from peer to "outstr" using the appropriate encapulation of 1664 * the data subject to Mode, Structure, and Type. 1665 * 1666 * N.B.: Form isn't handled. 1667 */ 1668static int 1669receive_data(FILE *instr, FILE *outstr) 1670{ 1671 int c; 1672 int cnt; 1673 char buf[BUFSIZ]; 1674 struct sigaction sa, sa_saved; 1675 volatile int bare_lfs = 0; 1676 1677 transflag++; 1678 switch (type) { 1679 1680 case TYPE_I: 1681 case TYPE_L: 1682 memset(&sa, 0, sizeof(sa)); 1683 sigfillset(&sa.sa_mask); 1684 sa.sa_flags = SA_RESTART; 1685 sa.sa_handler = lostconn; 1686 (void) sigaction(SIGALRM, &sa, &sa_saved); 1687 do { 1688 (void) alarm ((unsigned) timeout); 1689 cnt = read(fileno(instr), buf, sizeof(buf)); 1690 (void) alarm (0); 1691 if (recvurg) 1692 goto got_oob; 1693 1694 if (cnt > 0) { 1695 if (write(fileno(outstr), buf, cnt) != cnt) 1696 goto file_err; 1697 byte_count += cnt; 1698 } 1699 } while (cnt > 0); 1700 (void) sigaction(SIGALRM, &sa_saved, NULL); 1701 if (cnt < 0) 1702 goto data_err; 1703 transflag = 0; 1704 return (0); 1705 1706 case TYPE_E: 1707 reply(553, "TYPE E not implemented."); 1708 transflag = 0; 1709 return (-1); 1710 1711 case TYPE_A: 1712 while ((c = getc(instr)) != EOF) { 1713 if (recvurg) 1714 goto got_oob; 1715 byte_count++; 1716 if (c == '\n') 1717 bare_lfs++; 1718 while (c == '\r') { 1719 if (ferror(outstr)) 1720 goto data_err; 1721 if ((c = getc(instr)) != '\n') { 1722 (void) putc ('\r', outstr); 1723 if (c == '\0' || c == EOF) 1724 goto contin2; 1725 } 1726 } 1727 (void) putc(c, outstr); 1728 contin2: ; 1729 } 1730 fflush(outstr); 1731 if (ferror(instr)) 1732 goto data_err; 1733 if (ferror(outstr)) 1734 goto file_err; 1735 transflag = 0; 1736 if (bare_lfs) { 1737 lreply(226, 1738 "WARNING! %d bare linefeeds received in ASCII mode", 1739 bare_lfs); 1740 printf(" File may not have transferred correctly.\r\n"); 1741 } 1742 return (0); 1743 default: 1744 reply(550, "Unimplemented TYPE %d in receive_data", type); 1745 transflag = 0; 1746 return (-1); 1747 } 1748 1749data_err: 1750 transflag = 0; 1751 reply(426, "Data Connection"); 1752 return (-1); 1753 1754file_err: 1755 transflag = 0; 1756 reply(452, "Error writing file"); 1757 return (-1); 1758 1759got_oob: 1760 myoob(); 1761 recvurg = 0; 1762 transflag = 0; 1763 return (-1); 1764} 1765 1766void 1767statfilecmd(char *filename) 1768{ 1769 FILE *fin; 1770 int c; 1771 int atstart; 1772 char line[LINE_MAX]; 1773 1774 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1775 fin = ftpd_popen(line, "r"); 1776 lreply(211, "status of %s:", filename); 1777 atstart = 1; 1778 while ((c = getc(fin)) != EOF) { 1779 if (c == '\n') { 1780 if (ferror(stdout)){ 1781 perror_reply(421, "control connection"); 1782 (void) ftpd_pclose(fin); 1783 dologout(1); 1784 /* NOTREACHED */ 1785 } 1786 if (ferror(fin)) { 1787 perror_reply(551, filename); 1788 (void) ftpd_pclose(fin); 1789 return; 1790 } 1791 (void) putc('\r', stdout); 1792 } 1793 if (atstart && isdigit(c)) 1794 (void) putc(' ', stdout); 1795 (void) putc(c, stdout); 1796 atstart = (c == '\n'); 1797 } 1798 (void) ftpd_pclose(fin); 1799 reply(211, "End of Status"); 1800} 1801 1802void 1803statcmd(void) 1804{ 1805 union sockunion *su; 1806 u_char *a, *p; 1807 char hbuf[MAXHOSTNAMELEN]; 1808 int ispassive; 1809 int error; 1810 1811 lreply(211, "%s FTP server status:", hostname); 1812 error = getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1813 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST); 1814 printf(" Connected to %s", remotehost); 1815 if (error == 0 && strcmp(remotehost, hbuf) != 0) 1816 printf(" (%s)", hbuf); 1817 printf("\r\n"); 1818 if (logged_in) { 1819 if (guest) 1820 printf(" Logged in anonymously\r\n"); 1821 else 1822 printf(" Logged in as %s\r\n", pw->pw_name); 1823 } else if (askpasswd) 1824 printf(" Waiting for password\r\n"); 1825 else 1826 printf(" Waiting for user name\r\n"); 1827 printf(" TYPE: %s", typenames[type]); 1828 if (type == TYPE_A || type == TYPE_E) 1829 printf(", FORM: %s", formnames[form]); 1830 if (type == TYPE_L) 1831#if NBBY == 8 1832 printf(" %d", NBBY); 1833#else 1834 printf(" %d", bytesize); /* need definition! */ 1835#endif 1836 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1837 strunames[stru], modenames[mode]); 1838 ispassive = 0; 1839 if (data != -1) 1840 printf(" Data connection open\r\n"); 1841 else if (pdata != -1) { 1842 printf(" in Passive mode\r\n"); 1843 su = (union sockunion *)&pasv_addr; 1844 ispassive++; 1845 goto printaddr; 1846 } else if (usedefault == 0) { 1847 size_t alen; 1848 int af, i; 1849 1850 su = (union sockunion *)&data_dest; 1851printaddr: 1852 /* PASV/PORT */ 1853 if (su->su_family == AF_INET) { 1854 if (ispassive) 1855 printf("211- PASV "); 1856 else 1857 printf("211- PORT "); 1858 a = (u_char *)&su->su_sin.sin_addr; 1859 p = (u_char *)&su->su_sin.sin_port; 1860 printf("(%u,%u,%u,%u,%u,%u)\r\n", 1861 a[0], a[1], a[2], a[3], 1862 p[0], p[1]); 1863 } 1864 1865 /* LPSV/LPRT */ 1866 alen = 0; 1867 switch (su->su_family) { 1868 case AF_INET: 1869 a = (u_char *)&su->su_sin.sin_addr; 1870 p = (u_char *)&su->su_sin.sin_port; 1871 alen = sizeof(su->su_sin.sin_addr); 1872 af = 4; 1873 break; 1874 case AF_INET6: 1875 a = (u_char *)&su->su_sin6.sin6_addr; 1876 p = (u_char *)&su->su_sin6.sin6_port; 1877 alen = sizeof(su->su_sin6.sin6_addr); 1878 af = 6; 1879 break; 1880 default: 1881 af = 0; 1882 break; 1883 } 1884 if (af) { 1885 if (ispassive) 1886 printf("211- LPSV "); 1887 else 1888 printf("211- LPRT "); 1889 printf("(%u,%llu", af, (unsigned long long)alen); 1890 for (i = 0; i < alen; i++) 1891 printf(",%u", a[i]); 1892 printf(",%u,%u,%u)\r\n", 2, p[0], p[1]); 1893 } 1894 1895 /* EPRT/EPSV */ 1896 switch (su->su_family) { 1897 case AF_INET: 1898 af = 1; 1899 break; 1900 case AF_INET6: 1901 af = 2; 1902 break; 1903 default: 1904 af = 0; 1905 break; 1906 } 1907 if (af) { 1908 char pbuf[10]; 1909 union sockunion tmp = *su; 1910 1911 if (tmp.su_family == AF_INET6) 1912 tmp.su_sin6.sin6_scope_id = 0; 1913 if (getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 1914 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1915 NI_NUMERICHOST | NI_NUMERICSERV) == 0) { 1916 if (ispassive) 1917 printf("211- EPSV "); 1918 else 1919 printf("211- EPRT "); 1920 printf("(|%u|%s|%s|)\r\n", 1921 af, hbuf, pbuf); 1922 } 1923 } 1924 } else 1925 printf(" No data connection\r\n"); 1926 reply(211, "End of status"); 1927} 1928 1929void 1930fatal(char *s) 1931{ 1932 1933 reply(451, "Error in server: %s", s); 1934 reply(221, "Closing connection due to server error."); 1935 dologout(0); 1936 /* NOTREACHED */ 1937} 1938 1939void 1940reply(int n, const char *fmt, ...) 1941{ 1942 char *buf, *p, *next; 1943 int rval; 1944 va_list ap; 1945 1946 va_start(ap, fmt); 1947 rval = vasprintf(&buf, fmt, ap); 1948 va_end(ap); 1949 if (rval == -1 || buf == NULL) { 1950 printf("412 Local resource failure: malloc\r\n"); 1951 fflush(stdout); 1952 dologout(1); 1953 } 1954 next = buf; 1955 while ((p = strsep(&next, "\n\r"))) { 1956 printf("%d%s %s\r\n", n, (next != '\0') ? "-" : "", p); 1957 if (debug) 1958 syslog(LOG_DEBUG, "<--- %d%s %s", n, 1959 (next != '\0') ? "-" : "", p); 1960 } 1961 (void)fflush(stdout); 1962 free(buf); 1963} 1964 1965 1966void 1967reply_r(int n, const char *fmt, ...) 1968{ 1969 char *p, *next; 1970 char msg[BUFSIZ]; 1971 char buf[BUFSIZ]; 1972 va_list ap; 1973 struct syslog_data sdata = SYSLOG_DATA_INIT; 1974 1975 sdata.log_fac = LOG_FTP; 1976 va_start(ap, fmt); 1977 vsnprintf(msg, sizeof(msg), fmt, ap); 1978 va_end(ap); 1979 1980 next = msg; 1981 1982 while ((p = strsep(&next, "\n\r"))) { 1983 snprintf(buf, sizeof(buf), "%d%s %s\r\n", n, 1984 (next != '\0') ? "-" : "", p); 1985 write(STDOUT_FILENO, buf, strlen(buf)); 1986 if (debug) { 1987 buf[strlen(buf) - 2] = '\0'; 1988 syslog_r(LOG_DEBUG, &sdata, "<--- %s", buf); 1989 } 1990 } 1991} 1992 1993void 1994lreply(int n, const char *fmt, ...) 1995{ 1996 va_list ap; 1997 1998 va_start(ap, fmt); 1999 (void)printf("%d- ", n); 2000 (void)vprintf(fmt, ap); 2001 va_end(ap); 2002 (void)printf("\r\n"); 2003 (void)fflush(stdout); 2004 if (debug) { 2005 va_start(ap, fmt); 2006 syslog(LOG_DEBUG, "<--- %d- ", n); 2007 vsyslog(LOG_DEBUG, fmt, ap); 2008 va_end(ap); 2009 } 2010} 2011 2012static void 2013ack(char *s) 2014{ 2015 2016 reply(250, "%s command successful.", s); 2017} 2018 2019void 2020nack(char *s) 2021{ 2022 2023 reply(502, "%s command not implemented.", s); 2024} 2025 2026/* ARGSUSED */ 2027void 2028yyerror(char *s) 2029{ 2030 cbuf[strcspn(cbuf, "\n")] = '\0'; 2031 reply(500, "'%s': command not understood.", cbuf); 2032} 2033 2034void 2035delete(char *name) 2036{ 2037 struct stat st; 2038 2039 LOGCMD("delete", name); 2040 if (stat(name, &st) < 0) { 2041 perror_reply(550, name); 2042 return; 2043 } 2044 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2045 if (rmdir(name) < 0) { 2046 perror_reply(550, name); 2047 return; 2048 } 2049 goto done; 2050 } 2051 if (unlink(name) < 0) { 2052 perror_reply(550, name); 2053 return; 2054 } 2055done: 2056 ack("DELE"); 2057} 2058 2059void 2060cwd(char *path) 2061{ 2062 FILE *message; 2063 2064 if (chdir(path) < 0) 2065 perror_reply(550, path); 2066 else { 2067 if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) { 2068 char line[LINE_MAX]; 2069 2070 while (fgets(line, sizeof(line), message) != NULL) { 2071 line[strcspn(line, "\n")] = '\0'; 2072 lreply(250, "%s", line); 2073 } 2074 (void) fflush(stdout); 2075 (void) fclose(message); 2076 } 2077 ack("CWD"); 2078 } 2079} 2080 2081void 2082replydirname(const char *name, const char *message) 2083{ 2084 char *p, *ep; 2085 char npath[MAXPATHLEN * 2]; 2086 2087 p = npath; 2088 ep = &npath[sizeof(npath) - 1]; 2089 while (*name) { 2090 if (*name == '"') { 2091 if (ep - p < 2) 2092 break; 2093 *p++ = *name++; 2094 *p++ = '"'; 2095 } else { 2096 if (ep - p < 1) 2097 break; 2098 *p++ = *name++; 2099 } 2100 } 2101 *p = '\0'; 2102 reply(257, "\"%s\" %s", npath, message); 2103} 2104 2105void 2106makedir(char *name) 2107{ 2108 2109 LOGCMD("mkdir", name); 2110 if (mkdir(name, 0777) < 0) 2111 perror_reply(550, name); 2112 else 2113 replydirname(name, "directory created."); 2114} 2115 2116void 2117removedir(char *name) 2118{ 2119 2120 LOGCMD("rmdir", name); 2121 if (rmdir(name) < 0) 2122 perror_reply(550, name); 2123 else 2124 ack("RMD"); 2125} 2126 2127void 2128pwd(void) 2129{ 2130 char path[MAXPATHLEN]; 2131 2132 if (getcwd(path, sizeof(path)) == NULL) 2133 perror_reply(550, "Can't get current directory"); 2134 else 2135 replydirname(path, "is current directory."); 2136} 2137 2138char * 2139renamefrom(char *name) 2140{ 2141 struct stat st; 2142 2143 if (stat(name, &st) < 0) { 2144 perror_reply(550, name); 2145 return ((char *)0); 2146 } 2147 reply(350, "File exists, ready for destination name"); 2148 return (name); 2149} 2150 2151void 2152renamecmd(char *from, char *to) 2153{ 2154 2155 LOGCMD2("rename", from, to); 2156 if (rename(from, to) < 0) 2157 perror_reply(550, "rename"); 2158 else 2159 ack("RNTO"); 2160} 2161 2162static void 2163dolog(struct sockaddr *sa) 2164{ 2165 char hbuf[sizeof(remotehost)]; 2166 2167 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0) == 0) 2168 (void) strlcpy(remotehost, hbuf, sizeof(remotehost)); 2169 else 2170 (void) strlcpy(remotehost, "unknown", sizeof(remotehost)); 2171 2172#ifdef HASSETPROCTITLE 2173 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2174 setproctitle("%s", proctitle); 2175#endif /* HASSETPROCTITLE */ 2176 2177 if (logging) 2178 syslog(LOG_INFO, "connection from %s", remotehost); 2179} 2180 2181/* 2182 * Record logout in wtmp file and exit with supplied status. 2183 * NOTE: because this is called from signal handlers it cannot 2184 * use stdio (or call other functions that use stdio). 2185 */ 2186void 2187dologout(int status) 2188{ 2189 2190 transflag = 0; 2191 2192 if (logged_in) { 2193 sigprocmask(SIG_BLOCK, &allsigs, NULL); 2194 ftpdlogwtmp(ttyline, "", ""); 2195 if (doutmp) 2196 ftpd_logout(utmp.ut_line); 2197 } 2198 /* beware of flushing buffers after a SIGPIPE */ 2199 _exit(status); 2200} 2201 2202/*ARGSUSED*/ 2203static void 2204sigurg(int signo) 2205{ 2206 2207 recvurg = 1; 2208} 2209 2210static void 2211myoob(void) 2212{ 2213 char *cp; 2214 int ret; 2215 2216 /* only process if transfer occurring */ 2217 if (!transflag) 2218 return; 2219 cp = tmpline; 2220 ret = getline(cp, 7, stdin); 2221 if (ret == -1) { 2222 reply(221, "You could at least say goodbye."); 2223 dologout(0); 2224 } else if (ret == -2) { 2225 /* Ignore truncated command */ 2226 return; 2227 } 2228 upper(cp); 2229 if (strcmp(cp, "ABOR\r\n") == 0) { 2230 tmpline[0] = '\0'; 2231 reply(426, "Transfer aborted. Data connection closed."); 2232 reply(226, "Abort successful"); 2233 } 2234 if (strcmp(cp, "STAT\r\n") == 0) { 2235 tmpline[0] = '\0'; 2236 if (file_size != (off_t) -1) 2237 reply(213, "Status: %qd of %qd bytes transferred", 2238 byte_count, file_size); 2239 else 2240 reply(213, "Status: %qd bytes transferred", byte_count); 2241 } 2242} 2243 2244/* 2245 * Note: a response of 425 is not mentioned as a possible response to 2246 * the PASV command in RFC959. However, it has been blessed as 2247 * a legitimate response by Jon Postel in a telephone conversation 2248 * with Rick Adams on 25 Jan 89. 2249 */ 2250void 2251passive(void) 2252{ 2253 socklen_t len; 2254 int on; 2255 u_char *p, *a; 2256 2257 if (pw == NULL) { 2258 reply(530, "Please login with USER and PASS"); 2259 return; 2260 } 2261 if (pdata >= 0) 2262 close(pdata); 2263 /* 2264 * XXX 2265 * At this point, it would be nice to have an algorithm that 2266 * inserted a growing delay in an attack scenario. Such a thing 2267 * would look like continual passive sockets being opened, but 2268 * nothing serious being done with them. They're not used to 2269 * move data; the entire attempt is just to use tcp FIN_WAIT 2270 * resources. 2271 */ 2272 pdata = socket(AF_INET, SOCK_STREAM, 0); 2273 if (pdata < 0) { 2274 perror_reply(425, "Can't open passive connection"); 2275 return; 2276 } 2277 2278 on = IP_PORTRANGE_HIGH; 2279 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2280 &on, sizeof(on)) < 0) 2281 goto pasv_error; 2282 2283 pasv_addr = ctrl_addr; 2284 pasv_addr.su_sin.sin_port = 0; 2285 if (bind(pdata, (struct sockaddr *)&pasv_addr, 2286 pasv_addr.su_len) < 0) 2287 goto pasv_error; 2288 2289 len = sizeof(pasv_addr); 2290 if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) < 0) 2291 goto pasv_error; 2292 if (listen(pdata, 1) < 0) 2293 goto pasv_error; 2294 a = (u_char *)&pasv_addr.su_sin.sin_addr; 2295 p = (u_char *)&pasv_addr.su_sin.sin_port; 2296 2297 reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0], 2298 a[1], a[2], a[3], p[0], p[1]); 2299 return; 2300 2301pasv_error: 2302 perror_reply(425, "Can't open passive connection"); 2303 (void) close(pdata); 2304 pdata = -1; 2305 return; 2306} 2307 2308int 2309epsvproto2af(int proto) 2310{ 2311 2312 switch (proto) { 2313 case 1: return AF_INET; 2314#ifdef INET6 2315 case 2: return AF_INET6; 2316#endif 2317 default: return -1; 2318 } 2319} 2320 2321int 2322af2epsvproto(int af) 2323{ 2324 2325 switch (af) { 2326 case AF_INET: return 1; 2327#ifdef INET6 2328 case AF_INET6: return 2; 2329#endif 2330 default: return -1; 2331 } 2332} 2333 2334/* 2335 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2336 * 229 Entering Extended Passive Mode (|||port|) 2337 */ 2338void 2339long_passive(char *cmd, int pf) 2340{ 2341 socklen_t len; 2342 int on; 2343 u_char *p, *a; 2344 2345 if (!logged_in) { 2346 syslog(LOG_NOTICE, "long passive but not logged in"); 2347 reply(503, "Login with USER first."); 2348 return; 2349 } 2350 2351 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2352 /* 2353 * XXX 2354 * only EPRT/EPSV ready clients will understand this 2355 */ 2356 if (strcmp(cmd, "EPSV") != 0) 2357 reply(501, "Network protocol mismatch"); /*XXX*/ 2358 else 2359 epsv_protounsupp("Network protocol mismatch"); 2360 2361 return; 2362 } 2363 2364 if (pdata >= 0) 2365 close(pdata); 2366 /* 2367 * XXX 2368 * At this point, it would be nice to have an algorithm that 2369 * inserted a growing delay in an attack scenario. Such a thing 2370 * would look like continual passive sockets being opened, but 2371 * nothing serious being done with them. They not used to move 2372 * data; the entire attempt is just to use tcp FIN_WAIT 2373 * resources. 2374 */ 2375 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2376 if (pdata < 0) { 2377 perror_reply(425, "Can't open passive connection"); 2378 return; 2379 } 2380 2381 switch (ctrl_addr.su_family) { 2382 case AF_INET: 2383 on = IP_PORTRANGE_HIGH; 2384 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2385 &on, sizeof(on)) < 0) 2386 goto pasv_error; 2387 break; 2388 case AF_INET6: 2389 on = IPV6_PORTRANGE_HIGH; 2390 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2391 &on, sizeof(on)) < 0) 2392 goto pasv_error; 2393 break; 2394 } 2395 2396 pasv_addr = ctrl_addr; 2397 pasv_addr.su_port = 0; 2398 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2399 goto pasv_error; 2400 len = pasv_addr.su_len; 2401 if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) < 0) 2402 goto pasv_error; 2403 if (listen(pdata, 1) < 0) 2404 goto pasv_error; 2405 p = (u_char *)&pasv_addr.su_port; 2406 2407 if (strcmp(cmd, "LPSV") == 0) { 2408 switch (pasv_addr.su_family) { 2409 case AF_INET: 2410 a = (u_char *)&pasv_addr.su_sin.sin_addr; 2411 reply(228, 2412 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2413 4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]); 2414 return; 2415 case AF_INET6: 2416 a = (u_char *)&pasv_addr.su_sin6.sin6_addr; 2417 reply(228, 2418 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u," 2419 "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2420 6, 16, a[0], a[1], a[2], a[3], a[4], 2421 a[5], a[6], a[7], a[8], a[9], a[10], 2422 a[11], a[12], a[13], a[14], a[15], 2423 2, p[0], p[1]); 2424 return; 2425 } 2426 } else if (strcmp(cmd, "EPSV") == 0) { 2427 switch (pasv_addr.su_family) { 2428 case AF_INET: 2429 case AF_INET6: 2430 reply(229, "Entering Extended Passive Mode (|||%u|)", 2431 ntohs(pasv_addr.su_port)); 2432 return; 2433 } 2434 } else { 2435 /* more proper error code? */ 2436 } 2437 2438 pasv_error: 2439 perror_reply(425, "Can't open passive connection"); 2440 (void) close(pdata); 2441 pdata = -1; 2442 return; 2443} 2444 2445/* 2446 * EPRT |proto|addr|port| 2447 */ 2448int 2449extended_port(const char *arg) 2450{ 2451 char *tmp = NULL; 2452 char *result[3]; 2453 char *p, *q; 2454 char delim; 2455 struct addrinfo hints; 2456 struct addrinfo *res = NULL; 2457 int i; 2458 unsigned long proto; 2459 2460 if (epsvall) { 2461 reply(501, "EPRT disallowed after EPSV ALL"); 2462 return -1; 2463 } 2464 2465 usedefault = 0; 2466 if (pdata >= 0) { 2467 (void) close(pdata); 2468 pdata = -1; 2469 } 2470 2471 tmp = strdup(arg); 2472 if (!tmp) { 2473 fatal("not enough core."); 2474 /*NOTREACHED*/ 2475 } 2476 p = tmp; 2477 delim = p[0]; 2478 p++; 2479 memset(result, 0, sizeof(result)); 2480 for (i = 0; i < 3; i++) { 2481 q = strchr(p, delim); 2482 if (!q || *q != delim) 2483 goto parsefail; 2484 *q++ = '\0'; 2485 result[i] = p; 2486 p = q; 2487 } 2488 2489 /* some more sanity check */ 2490 p = NULL; 2491 (void)strtoul(result[2], &p, 10); 2492 if (!*result[2] || *p) 2493 goto protounsupp; 2494 p = NULL; 2495 proto = strtoul(result[0], &p, 10); 2496 if (!*result[0] || *p) 2497 goto protounsupp; 2498 2499 memset(&hints, 0, sizeof(hints)); 2500 hints.ai_family = epsvproto2af((int)proto); 2501 if (hints.ai_family < 0) 2502 goto protounsupp; 2503 hints.ai_socktype = SOCK_STREAM; 2504 hints.ai_flags = AI_NUMERICHOST; /*no DNS*/ 2505 if (getaddrinfo(result[1], result[2], &hints, &res)) 2506 goto parsefail; 2507 if (res->ai_next) 2508 goto parsefail; 2509 if (sizeof(data_dest) < res->ai_addrlen) 2510 goto parsefail; 2511 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2512 if (his_addr.su_family == AF_INET6 && 2513 data_dest.su_family == AF_INET6) { 2514 /* XXX more sanity checks! */ 2515 data_dest.su_sin6.sin6_scope_id = 2516 his_addr.su_sin6.sin6_scope_id; 2517 } 2518 if (pdata >= 0) { 2519 (void) close(pdata); 2520 pdata = -1; 2521 } 2522 reply(200, "EPRT command successful."); 2523 2524 if (tmp) 2525 free(tmp); 2526 if (res) 2527 freeaddrinfo(res); 2528 return 0; 2529 2530parsefail: 2531 reply(500, "Invalid argument, rejected."); 2532 usedefault = 1; 2533 if (tmp) 2534 free(tmp); 2535 if (res) 2536 freeaddrinfo(res); 2537 return -1; 2538 2539protounsupp: 2540 epsv_protounsupp("Protocol not supported"); 2541 usedefault = 1; 2542 if (tmp) 2543 free(tmp); 2544 if (res) 2545 freeaddrinfo(res); 2546 return -1; 2547} 2548 2549/* 2550 * 522 Protocol not supported (proto,...) 2551 * as we assume address family for control and data connections are the same, 2552 * we do not return the list of address families we support - instead, we 2553 * return the address family of the control connection. 2554 */ 2555void 2556epsv_protounsupp(const char *message) 2557{ 2558 int proto; 2559 2560 proto = af2epsvproto(ctrl_addr.su_family); 2561 if (proto < 0) 2562 reply(501, "%s", message); /*XXX*/ 2563 else 2564 reply(522, "%s, use (%d)", message, proto); 2565} 2566 2567/* 2568 * Generate unique name for file with basename "local". 2569 * The file named "local" is already known to exist. 2570 * Generates failure reply on error. 2571 */ 2572static int 2573guniquefd(char *local, char **nam) 2574{ 2575 static char new[MAXPATHLEN]; 2576 struct stat st; 2577 int count, len, fd; 2578 char *cp; 2579 2580 cp = strrchr(local, '/'); 2581 if (cp) 2582 *cp = '\0'; 2583 if (stat(cp ? local : ".", &st) < 0) { 2584 perror_reply(553, cp ? local : "."); 2585 return (-1); 2586 } 2587 if (cp) 2588 *cp = '/'; 2589 len = strlcpy(new, local, sizeof(new)); 2590 if (len+2+1 >= sizeof(new)-1) 2591 return (-1); 2592 cp = new + len; 2593 *cp++ = '.'; 2594 for (count = 1; count < 100; count++) { 2595 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 2596 fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666); 2597 if (fd == -1) 2598 continue; 2599 if (nam) 2600 *nam = new; 2601 return (fd); 2602 } 2603 reply(452, "Unique file name cannot be created."); 2604 return (-1); 2605} 2606 2607/* 2608 * Format and send reply containing system error number. 2609 */ 2610void 2611perror_reply(int code, char *string) 2612{ 2613 2614 reply(code, "%s: %s.", string, strerror(errno)); 2615} 2616 2617static char *onefile[] = { 2618 "", 2619 0 2620}; 2621 2622void 2623send_file_list(char *whichf) 2624{ 2625 struct stat st; 2626 DIR *dirp = NULL; 2627 struct dirent *dir; 2628 FILE *dout = NULL; 2629 char **dirlist; 2630 char *dirname; 2631 int simple = 0; 2632 volatile int freeglob = 0; 2633 glob_t gl; 2634 2635 if (strpbrk(whichf, "~{[*?") != NULL) { 2636 memset(&gl, 0, sizeof(gl)); 2637 freeglob = 1; 2638 if (glob(whichf, 2639 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, 2640 0, &gl)) { 2641 reply(550, "not found"); 2642 goto out; 2643 } else if (gl.gl_pathc == 0) { 2644 errno = ENOENT; 2645 perror_reply(550, whichf); 2646 goto out; 2647 } 2648 dirlist = gl.gl_pathv; 2649 } else { 2650 onefile[0] = whichf; 2651 dirlist = onefile; 2652 simple = 1; 2653 } 2654 2655 while ((dirname = *dirlist++)) { 2656 if (stat(dirname, &st) < 0) { 2657 /* 2658 * If user typed "ls -l", etc, and the client 2659 * used NLST, do what the user meant. 2660 */ 2661 if (dirname[0] == '-' && *dirlist == NULL && 2662 transflag == 0) { 2663 retrieve("/bin/ls %s", dirname); 2664 goto out; 2665 } 2666 perror_reply(550, whichf); 2667 if (dout != NULL) { 2668 (void) fclose(dout); 2669 transflag = 0; 2670 data = -1; 2671 pdata = -1; 2672 } 2673 goto out; 2674 } 2675 2676 if (S_ISREG(st.st_mode)) { 2677 if (dout == NULL) { 2678 dout = dataconn("file list", (off_t)-1, "w"); 2679 if (dout == NULL) 2680 goto out; 2681 transflag++; 2682 } 2683 fprintf(dout, "%s%s\n", dirname, 2684 type == TYPE_A ? "\r" : ""); 2685 byte_count += strlen(dirname) + 1; 2686 continue; 2687 } else if (!S_ISDIR(st.st_mode)) 2688 continue; 2689 2690 if ((dirp = opendir(dirname)) == NULL) 2691 continue; 2692 2693 while ((dir = readdir(dirp)) != NULL) { 2694 char nbuf[MAXPATHLEN]; 2695 2696 if (recvurg) { 2697 myoob(); 2698 recvurg = 0; 2699 transflag = 0; 2700 goto out; 2701 } 2702 2703 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2704 continue; 2705 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2706 dir->d_namlen == 2) 2707 continue; 2708 2709 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 2710 dir->d_name); 2711 2712 /* 2713 * We have to do a stat to insure it's 2714 * not a directory or special file. 2715 */ 2716 if (simple || (stat(nbuf, &st) == 0 && 2717 S_ISREG(st.st_mode))) { 2718 if (dout == NULL) { 2719 dout = dataconn("file list", (off_t)-1, 2720 "w"); 2721 if (dout == NULL) 2722 goto out; 2723 transflag++; 2724 } 2725 if (nbuf[0] == '.' && nbuf[1] == '/') 2726 fprintf(dout, "%s%s\n", &nbuf[2], 2727 type == TYPE_A ? "\r" : ""); 2728 else 2729 fprintf(dout, "%s%s\n", nbuf, 2730 type == TYPE_A ? "\r" : ""); 2731 byte_count += strlen(nbuf) + 1; 2732 } 2733 } 2734 (void) closedir(dirp); 2735 } 2736 2737 if (dout == NULL) 2738 reply(550, "No files found."); 2739 else if (ferror(dout) != 0) 2740 perror_reply(550, "Data connection"); 2741 else 2742 reply(226, "Transfer complete."); 2743 2744 transflag = 0; 2745 if (dout != NULL) 2746 (void) fclose(dout); 2747 else { 2748 if (pdata >= 0) 2749 close(pdata); 2750 } 2751 data = -1; 2752 pdata = -1; 2753out: 2754 if (freeglob) { 2755 freeglob = 0; 2756 globfree(&gl); 2757 } 2758} 2759 2760/*ARGSUSED*/ 2761static void 2762reapchild(int signo) 2763{ 2764 int save_errno = errno; 2765 int rval; 2766 2767 do { 2768 rval = waitpid(-1, NULL, WNOHANG); 2769 } while (rval > 0 || (rval == -1 && errno == EINTR)); 2770 errno = save_errno; 2771} 2772 2773void 2774logxfer(char *name, off_t size, time_t start) 2775{ 2776 char buf[400 + MAXHOSTNAMELEN*4 + MAXPATHLEN*4]; 2777 char dir[MAXPATHLEN], path[MAXPATHLEN], rpath[MAXPATHLEN]; 2778 char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; 2779 char *vpw; 2780 time_t now; 2781 int len; 2782 2783 if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) { 2784 time(&now); 2785 2786 vpw = malloc(strlen(guest ? guestpw : pw->pw_name) * 4 + 1); 2787 if (vpw == NULL) 2788 return; 2789 2790 snprintf(path, sizeof(path), "%s/%s", dir, name); 2791 if (realpath(path, rpath) == NULL) 2792 strlcpy(rpath, path, sizeof(rpath)); 2793 strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH); 2794 2795 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2796 strvis(vpw, guest? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2797 2798 len = snprintf(buf, sizeof(buf), 2799 "%.24s %d %s %qd %s %c %s %c %c %s ftp %d %s %s\n", 2800 ctime(&now), now - start + (now == start), 2801 vremotehost, (long long)size, vpath, 2802 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2803 'o', ((guest) ? 'a' : 'r'), 2804 vpw, 0 /* none yet */, 2805 ((guest) ? "*" : pw->pw_name), dhostname); 2806 free(vpw); 2807 2808 if (len >= sizeof(buf) || len == -1) { 2809 if ((len = strlen(buf)) == 0) 2810 return; /* should not happen */ 2811 buf[len - 1] = '\n'; 2812 } 2813 write(statfd, buf, len); 2814 } 2815} 2816 2817void 2818set_slave_signals(void) 2819{ 2820 struct sigaction sa; 2821 2822 sigemptyset(&sa.sa_mask); 2823 sa.sa_flags = SA_RESTART; 2824 2825 sa.sa_handler = SIG_DFL; 2826 (void) sigaction(SIGCHLD, &sa, NULL); 2827 2828 sa.sa_handler = sigurg; 2829 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 2830 (void) sigaction(SIGURG, &sa, NULL); 2831 2832 sigfillset(&sa.sa_mask); /* block all signals in handler */ 2833 sa.sa_flags = SA_RESTART; 2834 sa.sa_handler = sigquit; 2835 (void) sigaction(SIGHUP, &sa, NULL); 2836 (void) sigaction(SIGINT, &sa, NULL); 2837 (void) sigaction(SIGQUIT, &sa, NULL); 2838 (void) sigaction(SIGTERM, &sa, NULL); 2839 2840 sa.sa_handler = lostconn; 2841 (void) sigaction(SIGPIPE, &sa, NULL); 2842 2843 sa.sa_handler = toolong; 2844 (void) sigaction(SIGALRM, &sa, NULL); 2845 2846#ifdef F_SETOWN 2847 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 2848 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 2849#endif 2850} 2851 2852#if defined(TCPWRAPPERS) 2853static int 2854check_host(struct sockaddr *sa) 2855{ 2856 struct sockaddr_in *sin; 2857 struct hostent *hp; 2858 char *addr; 2859 2860 if (sa->sa_family != AF_INET) 2861 return 1; /*XXX*/ 2862 2863 sin = (struct sockaddr_in *)sa; 2864 hp = gethostbyaddr((char *)&sin->sin_addr, 2865 sizeof(struct in_addr), AF_INET); 2866 addr = inet_ntoa(sin->sin_addr); 2867 if (hp) { 2868 if (!hosts_ctl("ftpd", hp->h_name, addr, STRING_UNKNOWN)) { 2869 syslog(LOG_NOTICE, "tcpwrappers rejected: %s [%s]", 2870 hp->h_name, addr); 2871 return (0); 2872 } 2873 } else { 2874 if (!hosts_ctl("ftpd", STRING_UNKNOWN, addr, STRING_UNKNOWN)) { 2875 syslog(LOG_NOTICE, "tcpwrappers rejected: [%s]", addr); 2876 return (0); 2877 } 2878 } 2879 return (1); 2880} 2881#endif /* TCPWRAPPERS */ 2882 2883/* 2884 * Allocate space and return a copy of the specified dir. 2885 * If 'dir' begins with a tilde (~), expand it. 2886 */ 2887char * 2888copy_dir(char *dir, struct passwd *pw) 2889{ 2890 char *cp; 2891 char *newdir; 2892 char *user = NULL; 2893 2894 /* Nothing to expand */ 2895 if (dir[0] != '~') 2896 return (strdup(dir)); 2897 2898 /* "dir" is of form ~user/some/dir, lookup user. */ 2899 if (dir[1] != '/' && dir[1] != '\0') { 2900 if ((cp = strchr(dir + 1, '/')) == NULL) 2901 cp = dir + strlen(dir); 2902 if ((user = malloc((size_t)(cp - dir))) == NULL) 2903 return (NULL); 2904 strlcpy(user, dir + 1, (size_t)(cp - dir)); 2905 2906 /* Only do lookup if it is a different user. */ 2907 if (strcmp(user, pw->pw_name) != 0) { 2908 if ((pw = getpwnam(user)) == NULL) { 2909 /* No such user, interpret literally */ 2910 free(user); 2911 return(strdup(dir)); 2912 } 2913 } 2914 free(user); 2915 } 2916 2917 /* 2918 * If there is no directory separator (/) then it is just pw_dir. 2919 * Otherwise, replace ~foo with pw_dir. 2920 */ 2921 if ((cp = strchr(dir + 1, '/')) == NULL) { 2922 newdir = strdup(pw->pw_dir); 2923 } else { 2924 if (asprintf(&newdir, "%s%s", pw->pw_dir, cp) == -1) 2925 return (NULL); 2926 } 2927 2928 return(newdir); 2929} 2930