ftpd.c revision 1.169
1/* $OpenBSD: ftpd.c,v 1.169 2005/12/01 17:36:59 pvalchev 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 1.169 2005/12/01 17:36:59 pvalchev 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 128static char version[] = "Version 6.6/OpenBSD"; 129 130extern off_t restart_point; 131extern char cbuf[]; 132 133union sockunion server_addr; 134union sockunion ctrl_addr; 135union sockunion data_source; 136union sockunion data_dest; 137union sockunion his_addr; 138union sockunion pasv_addr; 139 140sigset_t allsigs; 141 142int daemon_mode = 0; 143int data; 144int logged_in; 145struct passwd *pw; 146int debug = 0; 147int timeout = 900; /* timeout after 15 minutes of inactivity */ 148int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 149int logging; 150int anon_ok = 1; 151int anon_only = 0; 152int multihome = 0; 153int guest; 154int stats; 155int statfd = -1; 156int portcheck = 1; 157int dochroot; 158int type; 159int form; 160int stru; /* avoid C keyword */ 161int mode; 162int doutmp = 0; /* update utmp file */ 163int usedefault = 1; /* for data transfers */ 164int pdata = -1; /* for passive mode */ 165int family = AF_UNSPEC; 166volatile sig_atomic_t transflag; 167off_t file_size; 168off_t byte_count; 169#if !defined(CMASK) || CMASK == 0 170#undef CMASK 171#define CMASK 022 172#endif 173int defumask = CMASK; /* default umask value */ 174int umaskchange = 1; /* allow user to change umask value. */ 175char tmpline[7]; 176char hostname[MAXHOSTNAMELEN]; 177char remotehost[MAXHOSTNAMELEN]; 178char dhostname[MAXHOSTNAMELEN]; 179char *guestpw; 180char ttyline[20]; 181char *tty = ttyline; /* for klogin */ 182static struct utmp utmp; /* for utmp */ 183static login_cap_t *lc; 184static auth_session_t *as; 185static volatile sig_atomic_t recvurg; 186 187#if defined(TCPWRAPPERS) 188int allow_severity = LOG_INFO; 189int deny_severity = LOG_NOTICE; 190#endif /* TCPWRAPPERS */ 191 192char *ident = NULL; 193 194 195int epsvall = 0; 196 197/* 198 * Timeout intervals for retrying connections 199 * to hosts that don't accept PORT cmds. This 200 * is a kludge, but given the problems with TCP... 201 */ 202#define SWAITMAX 90 /* wait at most 90 seconds */ 203#define SWAITINT 5 /* interval between retries */ 204 205int swaitmax = SWAITMAX; 206int swaitint = SWAITINT; 207 208#ifdef HASSETPROCTITLE 209char proctitle[BUFSIZ]; /* initial part of title */ 210#endif /* HASSETPROCTITLE */ 211 212#define LOGCMD(cmd, file) \ 213 if (logging > 1) \ 214 syslog(LOG_INFO,"%s %s%s", cmd, \ 215 *(file) == '/' ? "" : curdir(), file); 216#define LOGCMD2(cmd, file1, file2) \ 217 if (logging > 1) \ 218 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 219 *(file1) == '/' ? "" : curdir(), file1, \ 220 *(file2) == '/' ? "" : curdir(), file2); 221#define LOGBYTES(cmd, file, cnt) \ 222 if (logging > 1) { \ 223 if (cnt == (off_t)-1) \ 224 syslog(LOG_INFO,"%s %s%s", cmd, \ 225 *(file) == '/' ? "" : curdir(), file); \ 226 else \ 227 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 228 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 229 } 230 231static void ack(char *); 232static void sigurg(int); 233static void myoob(void); 234static int checkuser(char *, char *); 235static FILE *dataconn(char *, off_t, char *); 236static void dolog(struct sockaddr *); 237static char *copy_dir(char *, struct passwd *); 238static char *curdir(void); 239static void end_login(void); 240static FILE *getdatasock(char *); 241static int guniquefd(char *, char **); 242static void lostconn(int); 243static void sigquit(int); 244static int receive_data(FILE *, FILE *); 245static void replydirname(const char *, const char *); 246static int send_data(FILE *, FILE *, off_t, off_t, int); 247static struct passwd * 248 sgetpwnam(char *, struct passwd *); 249static void reapchild(int); 250#if defined(TCPWRAPPERS) 251static int check_host(struct sockaddr *); 252#endif /* TCPWRAPPERS */ 253static void usage(void); 254 255void logxfer(char *, off_t, time_t); 256void set_slave_signals(void); 257 258static char * 259curdir(void) 260{ 261 static char path[MAXPATHLEN+1]; /* path + '/' */ 262 263 if (getcwd(path, sizeof(path)-1) == NULL) 264 return (""); 265 if (path[1] != '\0') /* special case for root dir. */ 266 strlcat(path, "/", sizeof path); 267 /* For guest account, skip / since it's chrooted */ 268 return (guest ? path+1 : path); 269} 270 271char *argstr = "AdDhnlMSt:T:u:UvP46"; 272 273static void 274usage(void) 275{ 276 syslog(LOG_ERR, 277 "usage: ftpd [-46ADdlMnPSU] [-T maxtimeout] [-t timeout] [-u mask]"); 278 exit(2); 279} 280 281int 282main(int argc, char *argv[]) 283{ 284 socklen_t addrlen; 285 int ch, on = 1, tos; 286 char *cp, line[LINE_MAX]; 287 FILE *fp; 288 struct hostent *hp; 289 struct sigaction sa; 290 int error = 0; 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 = atoi(optarg); 337 if (maxtimeout < timeout) 338 maxtimeout = timeout; 339 break; 340 341 case 'T': 342 maxtimeout = atoi(optarg); 343 if (timeout > maxtimeout) 344 timeout = maxtimeout; 345 break; 346 347 case 'u': 348 { 349 long val = 0; 350 char *p; 351 umaskchange = 0; 352 353 val = strtol(optarg, &p, 8); 354 if (*p != '\0' || val < 0 || (val & ~ACCESSPERMS)) { 355 syslog(LOG_ERR, 356 "%s is a bad value for -u, aborting..", 357 optarg); 358 exit(2); 359 } else 360 defumask = val; 361 break; 362 } 363 364 case 'U': 365 doutmp = 1; 366 break; 367 368 case '4': 369 family = AF_INET; 370 break; 371 372 case '6': 373 family = AF_INET6; 374 break; 375 376 default: 377 usage(); 378 break; 379 } 380 } 381 382 (void) freopen(_PATH_DEVNULL, "w", stderr); 383 384 /* 385 * LOG_NDELAY sets up the logging connection immediately, 386 * necessary for anonymous ftp's that chroot and can't do it later. 387 */ 388 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 389 390 if (getpwnam(FTPD_PRIVSEP_USER) == NULL) { 391 syslog(LOG_ERR, "privilege separation user %s not found", 392 FTPD_PRIVSEP_USER); 393 exit(1); 394 } 395 endpwent(); 396 397 if (daemon_mode) { 398 int *fds, n, i, fd; 399 struct pollfd *pfds; 400 struct addrinfo hints, *res, *res0; 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 (char *)&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) fclose(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, (char *)&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, (char *)&on, sizeof(on)) < 0) 585 syslog(LOG_ERR, "setsockopt: %m"); 586#endif 587 588 dolog((struct sockaddr *)&his_addr); 589 /* 590 * Set up default state 591 */ 592 data = -1; 593 type = TYPE_A; 594 form = FORM_N; 595 stru = STRU_F; 596 mode = MODE_S; 597 tmpline[0] = '\0'; 598 599 /* If logins are disabled, print out the message. */ 600 if ((fp = fopen(_PATH_NOLOGIN, "r")) != NULL) { 601 while (fgets(line, sizeof(line), fp) != NULL) { 602 if ((cp = strchr(line, '\n')) != NULL) 603 *cp = '\0'; 604 lreply(530, "%s", line); 605 } 606 (void) fflush(stdout); 607 (void) fclose(fp); 608 reply(530, "System not available."); 609 exit(0); 610 } 611 if ((fp = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 612 while (fgets(line, sizeof(line), fp) != NULL) { 613 if ((cp = strchr(line, '\n')) != NULL) 614 *cp = '\0'; 615 lreply(220, "%s", line); 616 } 617 (void) fflush(stdout); 618 (void) fclose(fp); 619 /* reply(220,) must follow */ 620 } 621 (void) gethostname(hostname, sizeof(hostname)); 622 623 /* Make sure hostname is fully qualified. */ 624 hp = gethostbyname(hostname); 625 if (hp != NULL) 626 strlcpy(hostname, hp->h_name, sizeof(hostname)); 627 628 if (multihome) { 629 error = getnameinfo((struct sockaddr *)&ctrl_addr, 630 ctrl_addr.su_len, dhostname, sizeof(dhostname), NULL, 0, 0); 631 } 632 633 if (error != 0) 634 reply(220, "FTP server (%s) ready.", version); 635 else 636 reply(220, "%s FTP server (%s) ready.", 637 (multihome ? dhostname : hostname), version); 638 639 monitor_init(); 640 641 for (;;) 642 (void) yyparse(); 643 /* NOTREACHED */ 644} 645 646/* 647 * Signal handlers. 648 */ 649 650static void 651lostconn(int signo) 652{ 653 struct syslog_data sdata = SYSLOG_DATA_INIT; 654 655 if (debug) 656 syslog_r(LOG_DEBUG, &sdata, "lost connection"); 657 dologout(1); 658} 659 660static void 661sigquit(int signo) 662{ 663 struct syslog_data sdata = SYSLOG_DATA_INIT; 664 665 syslog_r(LOG_ERR, &sdata, "got signal %s", sys_signame[signo]); 666 dologout(1); 667} 668 669/* 670 * Save the result of a getpwnam. Used for USER command, since 671 * the data returned must not be clobbered by any other command 672 * (e.g., globbing). 673 */ 674static struct passwd * 675sgetpwnam(char *name, struct passwd *pw) 676{ 677 static struct passwd *save; 678 struct passwd *old; 679 680 if (pw == NULL && (pw = getpwnam(name)) == NULL) 681 return (NULL); 682 old = save; 683 save = pw_dup(pw); 684 if (save == NULL) { 685 perror_reply(421, "Local resource failure: malloc"); 686 dologout(1); 687 /* NOTREACHED */ 688 } 689 if (old) { 690 memset(old->pw_passwd, 0, strlen(old->pw_passwd)); 691 free(old); 692 } 693 return (save); 694} 695 696static int login_attempts; /* number of failed login attempts */ 697static int askpasswd; /* had user command, ask for passwd */ 698static char curname[MAXLOGNAME]; /* current USER name */ 699 700/* 701 * USER command. 702 * Sets global passwd pointer pw if named account exists and is acceptable; 703 * sets askpasswd if a PASS command is expected. If logged in previously, 704 * need to reset state. If name is "ftp" or "anonymous", the name is not in 705 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 706 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 707 * requesting login privileges. Disallow anyone who does not have a standard 708 * shell as returned by getusershell(). Disallow anyone mentioned in the file 709 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 710 */ 711void 712user(char *name) 713{ 714 char *cp, *shell, *style, *host; 715 char *class = NULL; 716 717 if (logged_in) { 718 kill_slave(); 719 end_login(); 720 } 721 722 /* Close session from previous user if there was one. */ 723 if (as) { 724 auth_close(as); 725 as = NULL; 726 } 727 if (lc) { 728 login_close(lc); 729 lc = NULL; 730 } 731 732 if ((style = strchr(name, ':')) != NULL) 733 *style++ = 0; 734 735 guest = 0; 736 host = multihome ? dhostname : hostname; 737 if (anon_ok && 738 (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0)) { 739 if (checkuser(_PATH_FTPUSERS, "ftp") || 740 checkuser(_PATH_FTPUSERS, "anonymous")) 741 reply(530, "User %s access denied.", name); 742 else if ((pw = sgetpwnam("ftp", NULL)) != NULL) { 743 guest = 1; 744 askpasswd = 1; 745 lc = login_getclass(pw->pw_class); 746 if ((as = auth_open()) == NULL || 747 auth_setpwd(as, pw) != 0 || 748 auth_setoption(as, "FTPD_HOST", host) < 0) { 749 if (as) { 750 auth_close(as); 751 as = NULL; 752 } 753 login_close(lc); 754 lc = NULL; 755 reply(421, "Local resource failure"); 756 return; 757 } 758 reply(331, 759 "Guest login ok, send your email address as password."); 760 } else 761 reply(530, "User %s unknown.", name); 762 if (!askpasswd && logging) 763 syslog(LOG_NOTICE, 764 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 765 return; 766 } 767 768 shell = _PATH_BSHELL; 769 if ((pw = sgetpwnam(name, NULL))) { 770 class = pw->pw_class; 771 if (pw->pw_shell != NULL && *pw->pw_shell != '\0') 772 shell = pw->pw_shell; 773 while ((cp = getusershell()) != NULL) 774 if (strcmp(cp, shell) == 0) 775 break; 776 shell = cp; 777 endusershell(); 778 } 779 780 /* Get login class; if invalid style treat like unknown user. */ 781 lc = login_getclass(class); 782 if (lc && (style = login_getstyle(lc, style, "auth-ftp")) == NULL) { 783 login_close(lc); 784 lc = NULL; 785 pw = NULL; 786 } 787 788 /* Do pre-authentication setup. */ 789 if (lc && ((as = auth_open()) == NULL || 790 (pw != NULL && auth_setpwd(as, pw) != 0) || 791 auth_setitem(as, AUTHV_STYLE, style) < 0 || 792 auth_setitem(as, AUTHV_NAME, name) < 0 || 793 auth_setitem(as, AUTHV_CLASS, class) < 0 || 794 auth_setoption(as, "login", "yes") < 0 || 795 auth_setoption(as, "notickets", "yes") < 0 || 796 auth_setoption(as, "FTPD_HOST", host) < 0)) { 797 if (as) { 798 auth_close(as); 799 as = NULL; 800 } 801 login_close(lc); 802 lc = NULL; 803 reply(421, "Local resource failure"); 804 return; 805 } 806 if (logging) 807 strlcpy(curname, name, sizeof(curname)); 808 809 dochroot = (lc && login_getcapbool(lc, "ftp-chroot", 0)) || 810 checkuser(_PATH_FTPCHROOT, name); 811 if (anon_only && !dochroot) { 812 if (anon_ok) 813 reply(530, "Sorry, only anonymous ftp allowed."); 814 else 815 reply(530, "User %s access denied.", name); 816 return; 817 } 818 if (pw) { 819 if ((!shell && !dochroot) || checkuser(_PATH_FTPUSERS, name)) { 820 reply(530, "User %s access denied.", name); 821 if (logging) 822 syslog(LOG_NOTICE, 823 "FTP LOGIN REFUSED FROM %s, %s", 824 remotehost, name); 825 pw = NULL; 826 return; 827 } 828 } 829 830 if (as != NULL && (cp = auth_challenge(as)) != NULL) 831 reply(331, "%s", cp); 832 else 833 reply(331, "Password required for %s.", name); 834 835 askpasswd = 1; 836 /* 837 * Delay before reading passwd after first failed 838 * attempt to slow down passwd-guessing programs. 839 */ 840 if (login_attempts) 841 sleep((unsigned) login_attempts); 842} 843 844/* 845 * Check if a user is in the file "fname" 846 */ 847static int 848checkuser(char *fname, char *name) 849{ 850 FILE *fp; 851 int found = 0; 852 char *p, line[BUFSIZ]; 853 854 if ((fp = fopen(fname, "r")) != NULL) { 855 while (fgets(line, sizeof(line), fp) != NULL) 856 if ((p = strchr(line, '\n')) != NULL) { 857 *p = '\0'; 858 if (line[0] == '#') 859 continue; 860 if (strcmp(line, name) == 0) { 861 found = 1; 862 break; 863 } 864 } 865 (void) fclose(fp); 866 } 867 return (found); 868} 869 870/* 871 * Terminate login as previous user, if any, resetting state; 872 * used when USER command is given or login fails. 873 */ 874static void 875end_login(void) 876{ 877 sigprocmask (SIG_BLOCK, &allsigs, NULL); 878 if (logged_in) { 879 ftpdlogwtmp(ttyline, "", ""); 880 if (doutmp) 881 ftpd_logout(utmp.ut_line); 882 } 883 reply(530, "Please reconnect to work as another user"); 884 _exit(0); 885} 886 887enum auth_ret 888pass(char *passwd) 889{ 890 int authok, flags; 891 FILE *fp; 892 static char homedir[MAXPATHLEN]; 893 char *motd, *dir, rootdir[MAXPATHLEN]; 894 size_t sz_pw_dir; 895 896 if (logged_in || askpasswd == 0) { 897 reply(503, "Login with USER first."); 898 return (AUTH_FAILED); 899 } 900 askpasswd = 0; 901 if (!guest) { /* "ftp" is only account allowed no password */ 902 authok = 0; 903 if (pw == NULL || pw->pw_passwd[0] == '\0') { 904 useconds_t us; 905 906 /* Sleep between 1 and 3 seconds to emulate a crypt. */ 907 us = arc4random() % 3000000; 908 usleep(us); 909 if (as != NULL) { 910 auth_close(as); 911 as = NULL; 912 } 913 } else { 914 authok = auth_userresponse(as, passwd, 0); 915 as = NULL; 916 } 917 if (authok == 0) { 918 reply(530, "Login incorrect."); 919 if (logging) 920 syslog(LOG_NOTICE, 921 "FTP LOGIN FAILED FROM %s, %s", 922 remotehost, curname); 923 pw = NULL; 924 if (login_attempts++ >= 5) { 925 syslog(LOG_NOTICE, 926 "repeated login failures from %s", 927 remotehost); 928 kill_slave(); 929 _exit(0); 930 } 931 return (AUTH_FAILED); 932 } 933 } else if (lc != NULL) { 934 /* Save anonymous' password. */ 935 if (guestpw != NULL) 936 free(guestpw); 937 guestpw = strdup(passwd); 938 if (guestpw == NULL) { 939 kill_slave(); 940 fatal("Out of memory."); 941 } 942 943 authok = auth_approval(as, lc, pw->pw_name, "ftp"); 944 auth_close(as); 945 as = NULL; 946 if (authok == 0) { 947 syslog(LOG_INFO|LOG_AUTH, 948 "FTP LOGIN FAILED (HOST) as %s: approval failure.", 949 pw->pw_name); 950 reply(530, "Approval failure."); 951 kill_slave(); 952 _exit(0); 953 } 954 } else { 955 syslog(LOG_INFO|LOG_AUTH, 956 "FTP LOGIN CLASS %s MISSING for %s: approval failure.", 957 pw->pw_class, pw->pw_name); 958 reply(530, "Permission denied."); 959 kill_slave(); 960 _exit(0); 961 } 962 963 if (monitor_post_auth() == 1) { 964 /* Post-auth monitor process */ 965 logged_in = 1; 966 return (AUTH_MONITOR); 967 } 968 969 login_attempts = 0; /* this time successful */ 970 /* set umask via setusercontext() unless -u flag was given. */ 971 flags = LOGIN_SETGROUP|LOGIN_SETPRIORITY|LOGIN_SETRESOURCES; 972 if (umaskchange) 973 flags |= LOGIN_SETUMASK; 974 else 975 (void) umask(defumask); 976 if (setusercontext(lc, pw, (uid_t)0, flags) != 0) { 977 perror_reply(451, "Local resource failure: setusercontext"); 978 syslog(LOG_NOTICE, "setusercontext: %m"); 979 dologout(1); 980 /* NOTREACHED */ 981 } 982 983 /* open wtmp before chroot */ 984 ftpdlogwtmp(ttyline, pw->pw_name, remotehost); 985 986 /* open utmp before chroot */ 987 if (doutmp) { 988 memset((void *)&utmp, 0, sizeof(utmp)); 989 (void)time(&utmp.ut_time); 990 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 991 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 992 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 993 ftpd_login(&utmp); 994 } 995 996 /* open stats file before chroot */ 997 if (guest && (stats == 1) && (statfd < 0)) 998 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 999 stats = 0; 1000 1001 logged_in = 1; 1002 1003 if ((dir = login_getcapstr(lc, "ftp-dir", NULL, NULL))) { 1004 char *newdir; 1005 1006 newdir = copy_dir(dir, pw); 1007 if (newdir == NULL) { 1008 perror_reply(421, "Local resource failure: malloc"); 1009 dologout(1); 1010 /* NOTREACHED */ 1011 } 1012 pw->pw_dir = newdir; 1013 pw = sgetpwnam(NULL, pw); 1014 free(dir); 1015 free(newdir); 1016 } 1017 1018 /* make sure pw->pw_dir is big enough to hold "/" */ 1019 sz_pw_dir = strlen(pw->pw_dir) + 1; 1020 if (sz_pw_dir < 2) { 1021 pw->pw_dir = "/"; 1022 pw = sgetpwnam(NULL, pw); 1023 sz_pw_dir = 2; 1024 } 1025 1026 if (guest || dochroot) { 1027 if (multihome && guest) { 1028 struct stat ts; 1029 1030 /* Compute root directory. */ 1031 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1032 pw->pw_dir, dhostname); 1033 if (stat(rootdir, &ts) < 0) { 1034 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1035 pw->pw_dir, hostname); 1036 } 1037 } else 1038 strlcpy(rootdir, pw->pw_dir, sizeof(rootdir)); 1039 } 1040 if (guest) { 1041 /* 1042 * We MUST do a chdir() after the chroot. Otherwise 1043 * the old current directory will be accessible as "." 1044 * outside the new root! 1045 */ 1046 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1047 reply(550, "Can't set guest privileges."); 1048 goto bad; 1049 } 1050 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1051 if (setenv("HOME", "/", 1) == -1) { 1052 reply(550, "Can't setup environment."); 1053 goto bad; 1054 } 1055 } else if (dochroot) { 1056 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1057 reply(550, "Can't change root."); 1058 goto bad; 1059 } 1060 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1061 if (setenv("HOME", "/", 1) == -1) { 1062 reply(550, "Can't setup environment."); 1063 goto bad; 1064 } 1065 } else if (chdir(pw->pw_dir) < 0) { 1066 if (chdir("/") < 0) { 1067 reply(530, "User %s: can't change directory to %s.", 1068 pw->pw_name, pw->pw_dir); 1069 goto bad; 1070 } else 1071 lreply(230, "No directory! Logging in with home=/"); 1072 } 1073 if (setegid(pw->pw_gid) < 0 || setgid(pw->pw_gid) < 0) { 1074 reply(550, "Can't set gid."); 1075 goto bad; 1076 } 1077 if (seteuid(pw->pw_uid) < 0 || setuid(pw->pw_uid) < 0) { 1078 reply(550, "Can't set uid."); 1079 goto bad; 1080 } 1081 sigprocmask(SIG_UNBLOCK, &allsigs, NULL); 1082 1083 /* 1084 * Set home directory so that use of ~ (tilde) works correctly. 1085 */ 1086 if (getcwd(homedir, MAXPATHLEN) != NULL) { 1087 if (setenv("HOME", homedir, 1) == -1) { 1088 reply(550, "Can't setup environment."); 1089 goto bad; 1090 } 1091 } 1092 1093 /* 1094 * Display a login message, if it exists. 1095 * N.B. reply(230,) must follow the message. 1096 */ 1097 motd = login_getcapstr(lc, "welcome", NULL, NULL); 1098 if ((fp = fopen(motd ? motd : _PATH_FTPLOGINMESG, "r")) != NULL) { 1099 char *cp, line[LINE_MAX]; 1100 1101 while (fgets(line, sizeof(line), fp) != NULL) { 1102 if ((cp = strchr(line, '\n')) != NULL) 1103 *cp = '\0'; 1104 lreply(230, "%s", line); 1105 } 1106 (void) fflush(stdout); 1107 (void) fclose(fp); 1108 } 1109 if (motd != NULL) 1110 free(motd); 1111 if (guest) { 1112 if (ident != NULL) 1113 free(ident); 1114 ident = strdup(passwd); 1115 if (ident == NULL) 1116 fatal("Ran out of memory."); 1117 reply(230, "Guest login ok, access restrictions apply."); 1118#ifdef HASSETPROCTITLE 1119 snprintf(proctitle, sizeof(proctitle), 1120 "%s: anonymous/%.*s", remotehost, 1121 (int)(sizeof(proctitle) - sizeof(remotehost) - 1122 sizeof(": anonymous/")), passwd); 1123 setproctitle("%s", proctitle); 1124#endif /* HASSETPROCTITLE */ 1125 if (logging) 1126 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1127 remotehost, passwd); 1128 } else { 1129 reply(230, "User %s logged in.", pw->pw_name); 1130#ifdef HASSETPROCTITLE 1131 snprintf(proctitle, sizeof(proctitle), 1132 "%s: %s", remotehost, pw->pw_name); 1133 setproctitle("%s", proctitle); 1134#endif /* HASSETPROCTITLE */ 1135 if (logging) 1136 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1137 remotehost, pw->pw_name); 1138 } 1139 login_close(lc); 1140 lc = NULL; 1141 return (AUTH_SLAVE); 1142bad: 1143 /* Forget all about it... */ 1144 login_close(lc); 1145 lc = NULL; 1146 end_login(); 1147 return (AUTH_FAILED); 1148} 1149 1150void 1151retrieve(char *cmd, char *name) 1152{ 1153 FILE *fin, *dout; 1154 struct stat st; 1155 int (*closefunc)(FILE *); 1156 time_t start; 1157 1158 if (cmd == 0) { 1159 fin = fopen(name, "r"), closefunc = fclose; 1160 st.st_size = 0; 1161 } else { 1162 char line[BUFSIZ]; 1163 1164 (void) snprintf(line, sizeof(line), cmd, name); 1165 name = line; 1166 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1167 st.st_size = -1; 1168 st.st_blksize = BUFSIZ; 1169 } 1170 if (fin == NULL) { 1171 if (errno != 0) { 1172 perror_reply(550, name); 1173 if (cmd == 0) { 1174 LOGCMD("get", name); 1175 } 1176 } 1177 return; 1178 } 1179 byte_count = -1; 1180 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1181 reply(550, "%s: not a plain file.", name); 1182 goto done; 1183 } 1184 if (restart_point) { 1185 if (type == TYPE_A) { 1186 off_t i, n; 1187 int c; 1188 1189 n = restart_point; 1190 i = 0; 1191 while (i++ < n) { 1192 if ((c = getc(fin)) == EOF) { 1193 if (ferror(fin)) { 1194 perror_reply(550, name); 1195 goto done; 1196 } else 1197 break; 1198 } 1199 if (c == '\n') 1200 i++; 1201 } 1202 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1203 perror_reply(550, name); 1204 goto done; 1205 } 1206 } 1207 dout = dataconn(name, st.st_size, "w"); 1208 if (dout == NULL) 1209 goto done; 1210 time(&start); 1211 send_data(fin, dout, st.st_blksize, st.st_size, 1212 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 1213 if ((cmd == 0) && stats) 1214 logxfer(name, byte_count, start); 1215 (void) fclose(dout); 1216 data = -1; 1217done: 1218 if (pdata >= 0) 1219 (void) close(pdata); 1220 pdata = -1; 1221 if (cmd == 0) 1222 LOGBYTES("get", name, byte_count); 1223 (*closefunc)(fin); 1224} 1225 1226void 1227store(char *name, char *mode, int unique) 1228{ 1229 FILE *fout, *din; 1230 int (*closefunc)(FILE *); 1231 struct stat st; 1232 int fd; 1233 1234 if (restart_point && *mode != 'a') 1235 mode = "r+"; 1236 1237 if (unique && stat(name, &st) == 0) { 1238 char *nam; 1239 1240 fd = guniquefd(name, &nam); 1241 if (fd == -1) { 1242 LOGCMD(*mode == 'w' ? "put" : "append", name); 1243 return; 1244 } 1245 name = nam; 1246 fout = fdopen(fd, mode); 1247 } else 1248 fout = fopen(name, mode); 1249 1250 closefunc = fclose; 1251 if (fout == NULL) { 1252 perror_reply(553, name); 1253 LOGCMD(*mode == 'w' ? "put" : "append", name); 1254 return; 1255 } 1256 byte_count = -1; 1257 if (restart_point) { 1258 if (type == TYPE_A) { 1259 off_t i, n; 1260 int c; 1261 1262 n = restart_point; 1263 i = 0; 1264 while (i++ < n) { 1265 if ((c = getc(fout)) == EOF) { 1266 if (ferror(fout)) { 1267 perror_reply(550, name); 1268 goto done; 1269 } else 1270 break; 1271 } 1272 if (c == '\n') 1273 i++; 1274 } 1275 /* 1276 * We must do this seek to "current" position 1277 * because we are changing from reading to 1278 * writing. 1279 */ 1280 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1281 perror_reply(550, name); 1282 goto done; 1283 } 1284 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1285 perror_reply(550, name); 1286 goto done; 1287 } 1288 } 1289 din = dataconn(name, (off_t)-1, "r"); 1290 if (din == NULL) 1291 goto done; 1292 if (receive_data(din, fout) == 0) { 1293 if (unique) 1294 reply(226, "Transfer complete (unique file name:%s).", 1295 name); 1296 else 1297 reply(226, "Transfer complete."); 1298 } 1299 (void) fclose(din); 1300 data = -1; 1301 pdata = -1; 1302done: 1303 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1304 (*closefunc)(fout); 1305} 1306 1307static FILE * 1308getdatasock(char *mode) 1309{ 1310 int on = 1, s, t, tries; 1311 1312 if (data >= 0) 1313 return (fdopen(data, mode)); 1314 sigprocmask (SIG_BLOCK, &allsigs, NULL); 1315 s = monitor_socket(ctrl_addr.su_family); 1316 if (s < 0) 1317 goto bad; 1318 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1319 (char *) &on, sizeof(on)) < 0) 1320 goto bad; 1321 /* anchor socket to avoid multi-homing problems */ 1322 data_source = ctrl_addr; 1323 data_source.su_port = htons(20); /* ftp-data port */ 1324 for (tries = 1; ; tries++) { 1325 if (monitor_bind(s, (struct sockaddr *)&data_source, 1326 data_source.su_len) >= 0) 1327 break; 1328 if (errno != EADDRINUSE || tries > 10) 1329 goto bad; 1330 sleep(tries); 1331 } 1332 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1333 1334#ifdef IP_TOS 1335 if (ctrl_addr.su_family == AF_INET) { 1336 on = IPTOS_THROUGHPUT; 1337 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1338 sizeof(int)) < 0) 1339 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1340 } 1341#endif 1342#ifdef TCP_NOPUSH 1343 /* 1344 * Turn off push flag to keep sender TCP from sending short packets 1345 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1346 * to set the send buffer size as well, but that may not be desirable 1347 * in heavy-load situations. 1348 */ 1349 on = 1; 1350 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof(on)) < 0) 1351 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1352#endif 1353#ifdef SO_SNDBUF 1354 on = 65536; 1355 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof(on)) < 0) 1356 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1357#endif 1358 1359 return (fdopen(s, mode)); 1360bad: 1361 /* Return the real value of errno (close may change it) */ 1362 t = errno; 1363 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1364 if (s >= 0) 1365 (void) close(s); 1366 errno = t; 1367 return (NULL); 1368} 1369 1370static FILE * 1371dataconn(char *name, off_t size, char *mode) 1372{ 1373 char sizebuf[32]; 1374 FILE *file; 1375 int retry = 0; 1376 in_port_t *p; 1377 u_char *fa, *ha; 1378 int alen; 1379 int error; 1380 1381 file_size = size; 1382 byte_count = 0; 1383 if (size != (off_t) -1) { 1384 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1385 size); 1386 } else 1387 sizebuf[0] = '\0'; 1388 if (pdata >= 0) { 1389 union sockunion from; 1390 int s; 1391 socklen_t fromlen = sizeof(from); 1392 1393 (void) alarm ((unsigned) timeout); 1394 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1395 (void) alarm (0); 1396 if (s < 0) { 1397 reply(425, "Can't open data connection."); 1398 (void) close(pdata); 1399 pdata = -1; 1400 return (NULL); 1401 } 1402 switch (from.su_family) { 1403 case AF_INET: 1404 p = (in_port_t *)&from.su_sin.sin_port; 1405 fa = (u_char *)&from.su_sin.sin_addr; 1406 ha = (u_char *)&his_addr.su_sin.sin_addr; 1407 alen = sizeof(struct in_addr); 1408 break; 1409 case AF_INET6: 1410 p = (in_port_t *)&from.su_sin6.sin6_port; 1411 fa = (u_char *)&from.su_sin6.sin6_addr; 1412 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1413 alen = sizeof(struct in6_addr); 1414 break; 1415 default: 1416 perror_reply(425, "Can't build data connection"); 1417 (void) close(pdata); 1418 (void) close(s); 1419 pdata = -1; 1420 return (NULL); 1421 } 1422 if (from.su_family != his_addr.su_family || 1423 ntohs(*p) < IPPORT_RESERVED) { 1424 perror_reply(425, "Can't build data connection"); 1425 (void) close(pdata); 1426 (void) close(s); 1427 pdata = -1; 1428 return (NULL); 1429 } 1430 if (portcheck && memcmp(fa, ha, alen) != 0) { 1431 perror_reply(435, "Can't build data connection"); 1432 (void) close(pdata); 1433 (void) close(s); 1434 pdata = -1; 1435 return (NULL); 1436 } 1437 (void) close(pdata); 1438 pdata = s; 1439 reply(150, "Opening %s mode data connection for '%s'%s.", 1440 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1441 return (fdopen(pdata, mode)); 1442 } 1443 if (data >= 0) { 1444 reply(125, "Using existing data connection for '%s'%s.", 1445 name, sizebuf); 1446 usedefault = 1; 1447 return (fdopen(data, mode)); 1448 } 1449 if (usedefault) 1450 data_dest = his_addr; 1451 usedefault = 1; 1452 do { 1453 file = getdatasock(mode); 1454 if (file == NULL) { 1455 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1456 1457 error = getnameinfo((struct sockaddr *)&data_source, 1458 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 1459 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV); 1460 if (error != 0) 1461 reply(425, "Can't create data socket: %s.", 1462 strerror(errno)); 1463 else 1464 reply(425, 1465 "Can't create data socket (%s,%s): %s.", 1466 hbuf, pbuf, strerror(errno)); 1467 return (NULL); 1468 } 1469 1470 /* 1471 * attempt to connect to reserved port on client machine; 1472 * this looks like an attack 1473 */ 1474 switch (data_dest.su_family) { 1475 case AF_INET: 1476 p = (in_port_t *)&data_dest.su_sin.sin_port; 1477 fa = (u_char *)&data_dest.su_sin.sin_addr; 1478 ha = (u_char *)&his_addr.su_sin.sin_addr; 1479 alen = sizeof(struct in_addr); 1480 break; 1481 case AF_INET6: 1482 p = (in_port_t *)&data_dest.su_sin6.sin6_port; 1483 fa = (u_char *)&data_dest.su_sin6.sin6_addr; 1484 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1485 alen = sizeof(struct in6_addr); 1486 break; 1487 default: 1488 perror_reply(425, "Can't build data connection"); 1489 (void) fclose(file); 1490 pdata = -1; 1491 return (NULL); 1492 } 1493 if (data_dest.su_family != his_addr.su_family || 1494 ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */ 1495 perror_reply(425, "Can't build data connection"); 1496 (void) fclose(file); 1497 return NULL; 1498 } 1499 if (portcheck && memcmp(fa, ha, alen) != 0) { 1500 perror_reply(435, "Can't build data connection"); 1501 (void) fclose(file); 1502 return NULL; 1503 } 1504 1505 if (connect(fileno(file), (struct sockaddr *)&data_dest, 1506 data_dest.su_len) == 0) { 1507 reply(150, "Opening %s mode data connection for '%s'%s.", 1508 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1509 data = fileno(file); 1510 return (file); 1511 } 1512 if (errno != EADDRINUSE) 1513 break; 1514 (void) fclose(file); 1515 sleep((unsigned) swaitint); 1516 retry += swaitint; 1517 } while (retry <= swaitmax); 1518 perror_reply(425, "Can't build data connection"); 1519 (void) fclose(file); 1520 return (NULL); 1521} 1522 1523/* 1524 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1525 * encapsulation of the data subject to Mode, Structure, and Type. 1526 * 1527 * NB: Form isn't handled. 1528 */ 1529static int 1530send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1531{ 1532 int c, cnt, filefd, netfd; 1533 char *buf, *bp; 1534 size_t len; 1535 1536 transflag++; 1537 switch (type) { 1538 1539 case TYPE_A: 1540 while ((c = getc(instr)) != EOF) { 1541 if (recvurg) 1542 goto got_oob; 1543 byte_count++; 1544 if (c == '\n') { 1545 if (ferror(outstr)) 1546 goto data_err; 1547 (void) putc('\r', outstr); 1548 } 1549 (void) putc(c, outstr); 1550 } 1551 fflush(outstr); 1552 transflag = 0; 1553 if (ferror(instr)) 1554 goto file_err; 1555 if (ferror(outstr)) 1556 goto data_err; 1557 reply(226, "Transfer complete."); 1558 return(0); 1559 1560 case TYPE_I: 1561 case TYPE_L: 1562 /* 1563 * isreg is only set if we are not doing restart and we 1564 * are sending a regular file 1565 */ 1566 netfd = fileno(outstr); 1567 filefd = fileno(instr); 1568 1569 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1570 buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd, 1571 (off_t)0); 1572 if (buf == MAP_FAILED) { 1573 syslog(LOG_WARNING, "mmap(%lu): %m", 1574 (unsigned long)filesize); 1575 goto oldway; 1576 } 1577 bp = buf; 1578 len = filesize; 1579 do { 1580 cnt = write(netfd, bp, len); 1581 if (recvurg) { 1582 munmap(buf, (size_t)filesize); 1583 goto got_oob; 1584 } 1585 len -= cnt; 1586 bp += cnt; 1587 if (cnt > 0) 1588 byte_count += cnt; 1589 } while(cnt > 0 && len > 0); 1590 1591 transflag = 0; 1592 munmap(buf, (size_t)filesize); 1593 if (cnt < 0) 1594 goto data_err; 1595 reply(226, "Transfer complete."); 1596 return(0); 1597 } 1598 1599oldway: 1600 if ((buf = malloc((u_int)blksize)) == NULL) { 1601 transflag = 0; 1602 perror_reply(451, "Local resource failure: malloc"); 1603 return(-1); 1604 } 1605 1606 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1607 write(netfd, buf, cnt) == cnt) 1608 byte_count += cnt; 1609 transflag = 0; 1610 (void)free(buf); 1611 if (cnt != 0) { 1612 if (cnt < 0) 1613 goto file_err; 1614 goto data_err; 1615 } 1616 reply(226, "Transfer complete."); 1617 return(0); 1618 default: 1619 transflag = 0; 1620 reply(550, "Unimplemented TYPE %d in send_data", type); 1621 return(-1); 1622 } 1623 1624data_err: 1625 transflag = 0; 1626 perror_reply(426, "Data connection"); 1627 return(-1); 1628 1629file_err: 1630 transflag = 0; 1631 perror_reply(551, "Error on input file"); 1632 return(-1); 1633 1634got_oob: 1635 myoob(); 1636 recvurg = 0; 1637 transflag = 0; 1638 return(-1); 1639} 1640 1641/* 1642 * Transfer data from peer to "outstr" using the appropriate encapulation of 1643 * the data subject to Mode, Structure, and Type. 1644 * 1645 * N.B.: Form isn't handled. 1646 */ 1647static int 1648receive_data(FILE *instr, FILE *outstr) 1649{ 1650 int c; 1651 int cnt; 1652 char buf[BUFSIZ]; 1653 struct sigaction sa, sa_saved; 1654 volatile int bare_lfs = 0; 1655 1656 transflag++; 1657 switch (type) { 1658 1659 case TYPE_I: 1660 case TYPE_L: 1661 memset(&sa, 0, sizeof(sa)); 1662 sigfillset(&sa.sa_mask); 1663 sa.sa_flags = SA_RESTART; 1664 sa.sa_handler = lostconn; 1665 (void) sigaction(SIGALRM, &sa, &sa_saved); 1666 do { 1667 (void) alarm ((unsigned) timeout); 1668 cnt = read(fileno(instr), buf, sizeof(buf)); 1669 (void) alarm (0); 1670 if (recvurg) 1671 goto got_oob; 1672 1673 if (cnt > 0) { 1674 if (write(fileno(outstr), buf, cnt) != cnt) 1675 goto file_err; 1676 byte_count += cnt; 1677 } 1678 } while (cnt > 0); 1679 (void) sigaction(SIGALRM, &sa_saved, NULL); 1680 if (cnt < 0) 1681 goto data_err; 1682 transflag = 0; 1683 return (0); 1684 1685 case TYPE_E: 1686 reply(553, "TYPE E not implemented."); 1687 transflag = 0; 1688 return (-1); 1689 1690 case TYPE_A: 1691 while ((c = getc(instr)) != EOF) { 1692 if (recvurg) 1693 goto got_oob; 1694 byte_count++; 1695 if (c == '\n') 1696 bare_lfs++; 1697 while (c == '\r') { 1698 if (ferror(outstr)) 1699 goto data_err; 1700 if ((c = getc(instr)) != '\n') { 1701 (void) putc ('\r', outstr); 1702 if (c == '\0' || c == EOF) 1703 goto contin2; 1704 } 1705 } 1706 (void) putc(c, outstr); 1707 contin2: ; 1708 } 1709 fflush(outstr); 1710 if (ferror(instr)) 1711 goto data_err; 1712 if (ferror(outstr)) 1713 goto file_err; 1714 transflag = 0; 1715 if (bare_lfs) { 1716 lreply(226, 1717 "WARNING! %d bare linefeeds received in ASCII mode", 1718 bare_lfs); 1719 printf(" File may not have transferred correctly.\r\n"); 1720 } 1721 return (0); 1722 default: 1723 reply(550, "Unimplemented TYPE %d in receive_data", type); 1724 transflag = 0; 1725 return (-1); 1726 } 1727 1728data_err: 1729 transflag = 0; 1730 perror_reply(426, "Data Connection"); 1731 return (-1); 1732 1733file_err: 1734 transflag = 0; 1735 perror_reply(452, "Error writing file"); 1736 return (-1); 1737 1738got_oob: 1739 myoob(); 1740 recvurg = 0; 1741 transflag = 0; 1742 return (-1); 1743} 1744 1745void 1746statfilecmd(char *filename) 1747{ 1748 FILE *fin; 1749 int c; 1750 int atstart; 1751 char line[LINE_MAX]; 1752 1753 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1754 fin = ftpd_popen(line, "r"); 1755 lreply(211, "status of %s:", filename); 1756 atstart = 1; 1757 while ((c = getc(fin)) != EOF) { 1758 if (c == '\n') { 1759 if (ferror(stdout)){ 1760 perror_reply(421, "control connection"); 1761 (void) ftpd_pclose(fin); 1762 dologout(1); 1763 /* NOTREACHED */ 1764 } 1765 if (ferror(fin)) { 1766 perror_reply(551, filename); 1767 (void) ftpd_pclose(fin); 1768 return; 1769 } 1770 (void) putc('\r', stdout); 1771 } 1772 if (atstart && isdigit(c)) 1773 (void) putc(' ', stdout); 1774 (void) putc(c, stdout); 1775 atstart = (c == '\n'); 1776 } 1777 (void) ftpd_pclose(fin); 1778 reply(211, "End of Status"); 1779} 1780 1781void 1782statcmd(void) 1783{ 1784 union sockunion *su; 1785 u_char *a, *p; 1786 char hbuf[MAXHOSTNAMELEN]; 1787 int ispassive; 1788 int error; 1789 1790 lreply(211, "%s FTP server status:", hostname); 1791 printf(" %s\r\n", version); 1792 error = getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1793 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST); 1794 printf(" Connected to %s", remotehost); 1795 if (error == 0 && strcmp(remotehost, hbuf) != 0) 1796 printf(" (%s)", hbuf); 1797 printf("\r\n"); 1798 if (logged_in) { 1799 if (guest) 1800 printf(" Logged in anonymously\r\n"); 1801 else 1802 printf(" Logged in as %s\r\n", pw->pw_name); 1803 } else if (askpasswd) 1804 printf(" Waiting for password\r\n"); 1805 else 1806 printf(" Waiting for user name\r\n"); 1807 printf(" TYPE: %s", typenames[type]); 1808 if (type == TYPE_A || type == TYPE_E) 1809 printf(", FORM: %s", formnames[form]); 1810 if (type == TYPE_L) 1811#if NBBY == 8 1812 printf(" %d", NBBY); 1813#else 1814 printf(" %d", bytesize); /* need definition! */ 1815#endif 1816 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1817 strunames[stru], modenames[mode]); 1818 ispassive = 0; 1819 if (data != -1) 1820 printf(" Data connection open\r\n"); 1821 else if (pdata != -1) { 1822 printf(" in Passive mode\r\n"); 1823 su = (union sockunion *)&pasv_addr; 1824 ispassive++; 1825 goto printaddr; 1826 } else if (usedefault == 0) { 1827 su = (union sockunion *)&data_dest; 1828printaddr: 1829 /* PASV/PORT */ 1830 if (su->su_family == AF_INET) { 1831 if (ispassive) 1832 printf("211- PASV "); 1833 else 1834 printf("211- PORT "); 1835 a = (u_char *) &su->su_sin.sin_addr; 1836 p = (u_char *) &su->su_sin.sin_port; 1837 printf("(%u,%u,%u,%u,%u,%u)\r\n", 1838 a[0], a[1], a[2], a[3], 1839 p[0], p[1]); 1840 } 1841 1842 /* LPSV/LPRT */ 1843 { 1844 int alen, af, i; 1845 1846 alen = 0; 1847 switch (su->su_family) { 1848 case AF_INET: 1849 a = (u_char *) &su->su_sin.sin_addr; 1850 p = (u_char *) &su->su_sin.sin_port; 1851 alen = sizeof(su->su_sin.sin_addr); 1852 af = 4; 1853 break; 1854 case AF_INET6: 1855 a = (u_char *) &su->su_sin6.sin6_addr; 1856 p = (u_char *) &su->su_sin6.sin6_port; 1857 alen = sizeof(su->su_sin6.sin6_addr); 1858 af = 6; 1859 break; 1860 default: 1861 af = 0; 1862 break; 1863 } 1864 if (af) { 1865 if (ispassive) 1866 printf("211- LPSV "); 1867 else 1868 printf("211- LPRT "); 1869 printf("(%u,%u", af, alen); 1870 for (i = 0; i < alen; i++) 1871 printf(",%u", a[i]); 1872 printf(",%u,%u,%u)\r\n", 2, p[0], p[1]); 1873 } 1874 } 1875 1876 /* EPRT/EPSV */ 1877 { 1878 u_char af; 1879 1880 switch (su->su_family) { 1881 case AF_INET: 1882 af = 1; 1883 break; 1884 case AF_INET6: 1885 af = 2; 1886 break; 1887 default: 1888 af = 0; 1889 break; 1890 } 1891 if (af) { 1892 char pbuf[10]; 1893 union sockunion tmp = *su; 1894 1895 if (tmp.su_family == AF_INET6) 1896 tmp.su_sin6.sin6_scope_id = 0; 1897 if (getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 1898 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1899 NI_NUMERICHOST | NI_NUMERICSERV) == 0) { 1900 if (ispassive) 1901 printf("211- EPSV "); 1902 else 1903 printf("211- EPRT "); 1904 printf("(|%u|%s|%s|)\r\n", 1905 af, hbuf, pbuf); 1906 } 1907 } 1908 } 1909 } else 1910 printf(" No data connection\r\n"); 1911 reply(211, "End of status"); 1912} 1913 1914void 1915fatal(char *s) 1916{ 1917 1918 reply(451, "Error in server: %s", s); 1919 reply(221, "Closing connection due to server error."); 1920 dologout(0); 1921 /* NOTREACHED */ 1922} 1923 1924void 1925reply(int n, const char *fmt, ...) 1926{ 1927 char *buf, *p, *next; 1928 int rval; 1929 va_list ap; 1930 1931 va_start(ap, fmt); 1932 rval = vasprintf(&buf, fmt, ap); 1933 va_end(ap); 1934 if (rval == -1 || buf == NULL) { 1935 printf("412 Local resource failure: malloc\r\n"); 1936 fflush(stdout); 1937 dologout(1); 1938 } 1939 next = buf; 1940 while ((p = strsep(&next, "\n\r"))) { 1941 printf("%d%s %s\r\n", n, (next != '\0') ? "-" : "", p); 1942 if (debug) 1943 syslog(LOG_DEBUG, "<--- %d%s %s", n, 1944 (next != '\0') ? "-" : "", p); 1945 } 1946 (void)fflush(stdout); 1947 free(buf); 1948} 1949 1950 1951void 1952reply_r(int n, const char *fmt, ...) 1953{ 1954 char *p, *next; 1955 char msg[BUFSIZ]; 1956 char buf[BUFSIZ]; 1957 va_list ap; 1958 struct syslog_data sdata = SYSLOG_DATA_INIT; 1959 1960 va_start(ap, fmt); 1961 vsnprintf(msg, sizeof(msg), fmt, ap); 1962 va_end(ap); 1963 1964 next = msg; 1965 1966 while ((p = strsep(&next, "\n\r"))) { 1967 snprintf(buf, sizeof(buf), "%d%s %s\r\n", n, 1968 (next != '\0') ? "-" : "", p); 1969 write(STDOUT_FILENO, buf, strlen(buf)); 1970 if (debug) { 1971 buf[strlen(buf) - 2] = '\0'; 1972 syslog_r(LOG_DEBUG, &sdata, "<--- %s", buf); 1973 } 1974 } 1975} 1976 1977void 1978lreply(int n, const char *fmt, ...) 1979{ 1980 va_list ap; 1981 1982 va_start(ap, fmt); 1983 (void)printf("%d- ", n); 1984 (void)vprintf(fmt, ap); 1985 va_end(ap); 1986 (void)printf("\r\n"); 1987 (void)fflush(stdout); 1988 if (debug) { 1989 va_start(ap, fmt); 1990 syslog(LOG_DEBUG, "<--- %d- ", n); 1991 vsyslog(LOG_DEBUG, fmt, ap); 1992 va_end(ap); 1993 } 1994} 1995 1996static void 1997ack(char *s) 1998{ 1999 2000 reply(250, "%s command successful.", s); 2001} 2002 2003void 2004nack(char *s) 2005{ 2006 2007 reply(502, "%s command not implemented.", s); 2008} 2009 2010/* ARGSUSED */ 2011void 2012yyerror(char *s) 2013{ 2014 char *cp; 2015 2016 if ((cp = strchr(cbuf,'\n'))) 2017 *cp = '\0'; 2018 reply(500, "'%s': command not understood.", cbuf); 2019} 2020 2021void 2022delete(char *name) 2023{ 2024 struct stat st; 2025 2026 LOGCMD("delete", name); 2027 if (stat(name, &st) < 0) { 2028 perror_reply(550, name); 2029 return; 2030 } 2031 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2032 if (rmdir(name) < 0) { 2033 perror_reply(550, name); 2034 return; 2035 } 2036 goto done; 2037 } 2038 if (unlink(name) < 0) { 2039 perror_reply(550, name); 2040 return; 2041 } 2042done: 2043 ack("DELE"); 2044} 2045 2046void 2047cwd(char *path) 2048{ 2049 FILE *message; 2050 2051 if (chdir(path) < 0) 2052 perror_reply(550, path); 2053 else { 2054 if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) { 2055 char *cp, line[LINE_MAX]; 2056 2057 while (fgets(line, sizeof(line), message) != NULL) { 2058 if ((cp = strchr(line, '\n')) != NULL) 2059 *cp = '\0'; 2060 lreply(250, "%s", line); 2061 } 2062 (void) fflush(stdout); 2063 (void) fclose(message); 2064 } 2065 ack("CWD"); 2066 } 2067} 2068 2069void 2070replydirname(const char *name, const char *message) 2071{ 2072 char *p, *ep; 2073 char npath[MAXPATHLEN * 2]; 2074 2075 p = npath; 2076 ep = &npath[sizeof(npath) - 1]; 2077 while (*name) { 2078 if (*name == '"') { 2079 if (ep - p < 2) 2080 break; 2081 *p++ = *name++; 2082 *p++ = '"'; 2083 } else { 2084 if (ep - p < 1) 2085 break; 2086 *p++ = *name++; 2087 } 2088 } 2089 *p = '\0'; 2090 reply(257, "\"%s\" %s", npath, message); 2091} 2092 2093void 2094makedir(char *name) 2095{ 2096 2097 LOGCMD("mkdir", name); 2098 if (mkdir(name, 0777) < 0) 2099 perror_reply(550, name); 2100 else 2101 replydirname(name, "directory created."); 2102} 2103 2104void 2105removedir(char *name) 2106{ 2107 2108 LOGCMD("rmdir", name); 2109 if (rmdir(name) < 0) 2110 perror_reply(550, name); 2111 else 2112 ack("RMD"); 2113} 2114 2115void 2116pwd(void) 2117{ 2118 char path[MAXPATHLEN]; 2119 2120 if (getcwd(path, sizeof(path)) == NULL) 2121 perror_reply(550, "Can't get current directory"); 2122 else 2123 replydirname(path, "is current directory."); 2124} 2125 2126char * 2127renamefrom(char *name) 2128{ 2129 struct stat st; 2130 2131 if (stat(name, &st) < 0) { 2132 perror_reply(550, name); 2133 return ((char *)0); 2134 } 2135 reply(350, "File exists, ready for destination name"); 2136 return (name); 2137} 2138 2139void 2140renamecmd(char *from, char *to) 2141{ 2142 2143 LOGCMD2("rename", from, to); 2144 if (rename(from, to) < 0) 2145 perror_reply(550, "rename"); 2146 else 2147 ack("RNTO"); 2148} 2149 2150static void 2151dolog(struct sockaddr *sa) 2152{ 2153 char hbuf[sizeof(remotehost)]; 2154 2155 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0) == 0) 2156 (void) strlcpy(remotehost, hbuf, sizeof(remotehost)); 2157 else 2158 (void) strlcpy(remotehost, "unknown", sizeof(remotehost)); 2159 2160#ifdef HASSETPROCTITLE 2161 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2162 setproctitle("%s", proctitle); 2163#endif /* HASSETPROCTITLE */ 2164 2165 if (logging) 2166 syslog(LOG_INFO, "connection from %s", remotehost); 2167} 2168 2169/* 2170 * Record logout in wtmp file and exit with supplied status. 2171 * NOTE: because this is called from signal handlers it cannot 2172 * use stdio (or call other functions that use stdio). 2173 */ 2174void 2175dologout(int status) 2176{ 2177 2178 transflag = 0; 2179 2180 if (logged_in) { 2181 sigprocmask(SIG_BLOCK, &allsigs, NULL); 2182 ftpdlogwtmp(ttyline, "", ""); 2183 if (doutmp) 2184 ftpd_logout(utmp.ut_line); 2185 } 2186 /* beware of flushing buffers after a SIGPIPE */ 2187 _exit(status); 2188} 2189 2190static void 2191sigurg(int signo) 2192{ 2193 2194 recvurg = 1; 2195} 2196 2197static void 2198myoob(void) 2199{ 2200 char *cp; 2201 2202 /* only process if transfer occurring */ 2203 if (!transflag) 2204 return; 2205 cp = tmpline; 2206 if (getline(cp, 7, stdin) == NULL) { 2207 reply(221, "You could at least say goodbye."); 2208 dologout(0); 2209 } 2210 upper(cp); 2211 if (strcmp(cp, "ABOR\r\n") == 0) { 2212 tmpline[0] = '\0'; 2213 reply(426, "Transfer aborted. Data connection closed."); 2214 reply(226, "Abort successful"); 2215 } 2216 if (strcmp(cp, "STAT\r\n") == 0) { 2217 tmpline[0] = '\0'; 2218 if (file_size != (off_t) -1) 2219 reply(213, "Status: %qd of %qd bytes transferred", 2220 byte_count, file_size); 2221 else 2222 reply(213, "Status: %qd bytes transferred", byte_count); 2223 } 2224} 2225 2226/* 2227 * Note: a response of 425 is not mentioned as a possible response to 2228 * the PASV command in RFC959. However, it has been blessed as 2229 * a legitimate response by Jon Postel in a telephone conversation 2230 * with Rick Adams on 25 Jan 89. 2231 */ 2232void 2233passive(void) 2234{ 2235 socklen_t len; 2236 int on; 2237 u_char *p, *a; 2238 2239 if (pw == NULL) { 2240 reply(530, "Please login with USER and PASS"); 2241 return; 2242 } 2243 if (pdata >= 0) 2244 close(pdata); 2245 /* 2246 * XXX 2247 * At this point, it would be nice to have an algorithm that 2248 * inserted a growing delay in an attack scenario. Such a thing 2249 * would look like continual passive sockets being opened, but 2250 * nothing serious being done with them. They're not used to 2251 * move data; the entire attempt is just to use tcp FIN_WAIT 2252 * resources. 2253 */ 2254 pdata = socket(AF_INET, SOCK_STREAM, 0); 2255 if (pdata < 0) { 2256 perror_reply(425, "Can't open passive connection"); 2257 return; 2258 } 2259 2260 on = IP_PORTRANGE_HIGH; 2261 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2262 (char *)&on, sizeof(on)) < 0) 2263 goto pasv_error; 2264 2265 pasv_addr = ctrl_addr; 2266 pasv_addr.su_sin.sin_port = 0; 2267 if (bind(pdata, (struct sockaddr *)&pasv_addr, 2268 pasv_addr.su_len) < 0) 2269 goto pasv_error; 2270 2271 len = sizeof(pasv_addr); 2272 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2273 goto pasv_error; 2274 if (listen(pdata, 1) < 0) 2275 goto pasv_error; 2276 a = (u_char *) &pasv_addr.su_sin.sin_addr; 2277 p = (u_char *) &pasv_addr.su_sin.sin_port; 2278 2279 reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0], 2280 a[1], a[2], a[3], p[0], p[1]); 2281 return; 2282 2283pasv_error: 2284 (void) close(pdata); 2285 pdata = -1; 2286 perror_reply(425, "Can't open passive connection"); 2287 return; 2288} 2289 2290/* 2291 * convert protocol identifier to/from AF 2292 */ 2293int 2294lpsvproto2af(int proto) 2295{ 2296 2297 switch (proto) { 2298 case 4: return AF_INET; 2299#ifdef INET6 2300 case 6: return AF_INET6; 2301#endif 2302 default: return -1; 2303 } 2304} 2305 2306int 2307af2lpsvproto(int af) 2308{ 2309 2310 switch (af) { 2311 case AF_INET: return 4; 2312#ifdef INET6 2313 case AF_INET6: return 6; 2314#endif 2315 default: return -1; 2316 } 2317} 2318 2319int 2320epsvproto2af(int proto) 2321{ 2322 2323 switch (proto) { 2324 case 1: return AF_INET; 2325#ifdef INET6 2326 case 2: return AF_INET6; 2327#endif 2328 default: return -1; 2329 } 2330} 2331 2332int 2333af2epsvproto(int af) 2334{ 2335 2336 switch (af) { 2337 case AF_INET: return 1; 2338#ifdef INET6 2339 case AF_INET6: return 2; 2340#endif 2341 default: return -1; 2342 } 2343} 2344 2345/* 2346 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2347 * 229 Entering Extended Passive Mode (|||port|) 2348 */ 2349void 2350long_passive(char *cmd, int pf) 2351{ 2352 socklen_t len; 2353 int on; 2354 u_char *p, *a; 2355 2356 if (!logged_in) { 2357 syslog(LOG_NOTICE, "long passive but not logged in"); 2358 reply(503, "Login with USER first."); 2359 return; 2360 } 2361 2362 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2363 /* 2364 * XXX 2365 * only EPRT/EPSV ready clients will understand this 2366 */ 2367 if (strcmp(cmd, "EPSV") != 0) 2368 reply(501, "Network protocol mismatch"); /*XXX*/ 2369 else 2370 epsv_protounsupp("Network protocol mismatch"); 2371 2372 return; 2373 } 2374 2375 if (pdata >= 0) 2376 close(pdata); 2377 /* 2378 * XXX 2379 * At this point, it would be nice to have an algorithm that 2380 * inserted a growing delay in an attack scenario. Such a thing 2381 * would look like continual passive sockets being opened, but 2382 * nothing serious being done with them. They not used to move 2383 * data; the entire attempt is just to use tcp FIN_WAIT 2384 * resources. 2385 */ 2386 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2387 if (pdata < 0) { 2388 perror_reply(425, "Can't open passive connection"); 2389 return; 2390 } 2391 2392 switch (ctrl_addr.su_family) { 2393 case AF_INET: 2394 on = IP_PORTRANGE_HIGH; 2395 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2396 (char *)&on, sizeof(on)) < 0) 2397 goto pasv_error; 2398 break; 2399 case AF_INET6: 2400 on = IPV6_PORTRANGE_HIGH; 2401 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2402 (char *)&on, sizeof(on)) < 0) 2403 goto pasv_error; 2404 break; 2405 } 2406 2407 pasv_addr = ctrl_addr; 2408 pasv_addr.su_port = 0; 2409 if (bind(pdata, (struct sockaddr *) &pasv_addr, pasv_addr.su_len) < 0) 2410 goto pasv_error; 2411 len = pasv_addr.su_len; 2412 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2413 goto pasv_error; 2414 if (listen(pdata, 1) < 0) 2415 goto pasv_error; 2416 p = (u_char *) &pasv_addr.su_port; 2417 2418 if (strcmp(cmd, "LPSV") == 0) { 2419 switch (pasv_addr.su_family) { 2420 case AF_INET: 2421 a = (u_char *) &pasv_addr.su_sin.sin_addr; 2422 reply(228, 2423 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2424 4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]); 2425 return; 2426 case AF_INET6: 2427 a = (u_char *) &pasv_addr.su_sin6.sin6_addr; 2428 reply(228, 2429 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u," 2430 "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2431 6, 16, a[0], a[1], a[2], a[3], a[4], 2432 a[5], a[6], a[7], a[8], a[9], a[10], 2433 a[11], a[12], a[13], a[14], a[15], 2434 2, p[0], p[1]); 2435 return; 2436 } 2437 } else if (strcmp(cmd, "EPSV") == 0) { 2438 switch (pasv_addr.su_family) { 2439 case AF_INET: 2440 case AF_INET6: 2441 reply(229, "Entering Extended Passive Mode (|||%u|)", 2442 ntohs(pasv_addr.su_port)); 2443 return; 2444 } 2445 } else { 2446 /* more proper error code? */ 2447 } 2448 2449 pasv_error: 2450 (void) close(pdata); 2451 pdata = -1; 2452 perror_reply(425, "Can't open passive connection"); 2453 return; 2454} 2455 2456/* 2457 * EPRT |proto|addr|port| 2458 */ 2459int 2460extended_port(const char *arg) 2461{ 2462 char *tmp = NULL; 2463 char *result[3]; 2464 char *p, *q; 2465 char delim; 2466 struct addrinfo hints; 2467 struct addrinfo *res = NULL; 2468 int i; 2469 unsigned long proto; 2470 2471 if (epsvall) { 2472 reply(501, "EPRT disallowed after EPSV ALL"); 2473 return -1; 2474 } 2475 2476 usedefault = 0; 2477 if (pdata >= 0) { 2478 (void) close(pdata); 2479 pdata = -1; 2480 } 2481 2482 tmp = strdup(arg); 2483 if (!tmp) { 2484 fatal("not enough core."); 2485 /*NOTREACHED*/ 2486 } 2487 p = tmp; 2488 delim = p[0]; 2489 p++; 2490 memset(result, 0, sizeof(result)); 2491 for (i = 0; i < 3; i++) { 2492 q = strchr(p, delim); 2493 if (!q || *q != delim) 2494 goto parsefail; 2495 *q++ = '\0'; 2496 result[i] = p; 2497 p = q; 2498 } 2499 2500 /* some more sanity check */ 2501 p = NULL; 2502 (void)strtoul(result[2], &p, 10); 2503 if (!*result[2] || *p) 2504 goto protounsupp; 2505 p = NULL; 2506 proto = strtoul(result[0], &p, 10); 2507 if (!*result[0] || *p) 2508 goto protounsupp; 2509 2510 memset(&hints, 0, sizeof(hints)); 2511 hints.ai_family = epsvproto2af((int)proto); 2512 if (hints.ai_family < 0) 2513 goto protounsupp; 2514 hints.ai_socktype = SOCK_STREAM; 2515 hints.ai_flags = AI_NUMERICHOST; /*no DNS*/ 2516 if (getaddrinfo(result[1], result[2], &hints, &res)) 2517 goto parsefail; 2518 if (res->ai_next) 2519 goto parsefail; 2520 if (sizeof(data_dest) < res->ai_addrlen) 2521 goto parsefail; 2522 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2523 if (his_addr.su_family == AF_INET6 && 2524 data_dest.su_family == AF_INET6) { 2525 /* XXX more sanity checks! */ 2526 data_dest.su_sin6.sin6_scope_id = 2527 his_addr.su_sin6.sin6_scope_id; 2528 } 2529 if (pdata >= 0) { 2530 (void) close(pdata); 2531 pdata = -1; 2532 } 2533 reply(200, "EPRT command successful."); 2534 2535 if (tmp) 2536 free(tmp); 2537 if (res) 2538 freeaddrinfo(res); 2539 return 0; 2540 2541parsefail: 2542 reply(500, "Invalid argument, rejected."); 2543 usedefault = 1; 2544 if (tmp) 2545 free(tmp); 2546 if (res) 2547 freeaddrinfo(res); 2548 return -1; 2549 2550protounsupp: 2551 epsv_protounsupp("Protocol not supported"); 2552 usedefault = 1; 2553 if (tmp) 2554 free(tmp); 2555 if (res) 2556 freeaddrinfo(res); 2557 return -1; 2558} 2559 2560/* 2561 * 522 Protocol not supported (proto,...) 2562 * as we assume address family for control and data connections are the same, 2563 * we do not return the list of address families we support - instead, we 2564 * return the address family of the control connection. 2565 */ 2566void 2567epsv_protounsupp(const char *message) 2568{ 2569 int proto; 2570 2571 proto = af2epsvproto(ctrl_addr.su_family); 2572 if (proto < 0) 2573 reply(501, "%s", message); /*XXX*/ 2574 else 2575 reply(522, "%s, use (%d)", message, proto); 2576} 2577 2578/* 2579 * Generate unique name for file with basename "local". 2580 * The file named "local" is already known to exist. 2581 * Generates failure reply on error. 2582 */ 2583static int 2584guniquefd(char *local, char **nam) 2585{ 2586 static char new[MAXPATHLEN]; 2587 struct stat st; 2588 int count, len, fd; 2589 char *cp; 2590 2591 cp = strrchr(local, '/'); 2592 if (cp) 2593 *cp = '\0'; 2594 if (stat(cp ? local : ".", &st) < 0) { 2595 perror_reply(553, cp ? local : "."); 2596 return (-1); 2597 } 2598 if (cp) 2599 *cp = '/'; 2600 len = strlcpy(new, local, sizeof(new)); 2601 if (len+2+1 >= sizeof(new)-1) 2602 return (-1); 2603 cp = new + len; 2604 *cp++ = '.'; 2605 for (count = 1; count < 100; count++) { 2606 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 2607 fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666); 2608 if (fd == -1) 2609 continue; 2610 if (nam) 2611 *nam = new; 2612 return (fd); 2613 } 2614 reply(452, "Unique file name cannot be created."); 2615 return (-1); 2616} 2617 2618/* 2619 * Format and send reply containing system error number. 2620 */ 2621void 2622perror_reply(int code, char *string) 2623{ 2624 2625 reply(code, "%s: %s.", string, strerror(errno)); 2626} 2627 2628static char *onefile[] = { 2629 "", 2630 0 2631}; 2632 2633void 2634send_file_list(char *whichf) 2635{ 2636 struct stat st; 2637 DIR *dirp = NULL; 2638 struct dirent *dir; 2639 FILE *dout = NULL; 2640 char **dirlist; 2641 char *dirname; 2642 int simple = 0; 2643 volatile int freeglob = 0; 2644 glob_t gl; 2645 2646 if (strpbrk(whichf, "~{[*?") != NULL) { 2647 memset(&gl, 0, sizeof(gl)); 2648 freeglob = 1; 2649 if (glob(whichf, 2650 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, 2651 0, &gl)) { 2652 reply(550, "not found"); 2653 goto out; 2654 } else if (gl.gl_pathc == 0) { 2655 errno = ENOENT; 2656 perror_reply(550, whichf); 2657 goto out; 2658 } 2659 dirlist = gl.gl_pathv; 2660 } else { 2661 onefile[0] = whichf; 2662 dirlist = onefile; 2663 simple = 1; 2664 } 2665 2666 while ((dirname = *dirlist++)) { 2667 if (stat(dirname, &st) < 0) { 2668 /* 2669 * If user typed "ls -l", etc, and the client 2670 * used NLST, do what the user meant. 2671 */ 2672 if (dirname[0] == '-' && *dirlist == NULL && 2673 transflag == 0) { 2674 retrieve("/bin/ls %s", dirname); 2675 goto out; 2676 } 2677 perror_reply(550, whichf); 2678 if (dout != NULL) { 2679 (void) fclose(dout); 2680 transflag = 0; 2681 data = -1; 2682 pdata = -1; 2683 } 2684 goto out; 2685 } 2686 2687 if (S_ISREG(st.st_mode)) { 2688 if (dout == NULL) { 2689 dout = dataconn("file list", (off_t)-1, "w"); 2690 if (dout == NULL) 2691 goto out; 2692 transflag++; 2693 } 2694 fprintf(dout, "%s%s\n", dirname, 2695 type == TYPE_A ? "\r" : ""); 2696 byte_count += strlen(dirname) + 1; 2697 continue; 2698 } else if (!S_ISDIR(st.st_mode)) 2699 continue; 2700 2701 if ((dirp = opendir(dirname)) == NULL) 2702 continue; 2703 2704 while ((dir = readdir(dirp)) != NULL) { 2705 char nbuf[MAXPATHLEN]; 2706 2707 if (recvurg) { 2708 myoob(); 2709 recvurg = 0; 2710 transflag = 0; 2711 goto out; 2712 } 2713 2714 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2715 continue; 2716 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2717 dir->d_namlen == 2) 2718 continue; 2719 2720 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 2721 dir->d_name); 2722 2723 /* 2724 * We have to do a stat to insure it's 2725 * not a directory or special file. 2726 */ 2727 if (simple || (stat(nbuf, &st) == 0 && 2728 S_ISREG(st.st_mode))) { 2729 if (dout == NULL) { 2730 dout = dataconn("file list", (off_t)-1, 2731 "w"); 2732 if (dout == NULL) 2733 goto out; 2734 transflag++; 2735 } 2736 if (nbuf[0] == '.' && nbuf[1] == '/') 2737 fprintf(dout, "%s%s\n", &nbuf[2], 2738 type == TYPE_A ? "\r" : ""); 2739 else 2740 fprintf(dout, "%s%s\n", nbuf, 2741 type == TYPE_A ? "\r" : ""); 2742 byte_count += strlen(nbuf) + 1; 2743 } 2744 } 2745 (void) closedir(dirp); 2746 } 2747 2748 if (dout == NULL) 2749 reply(550, "No files found."); 2750 else if (ferror(dout) != 0) 2751 perror_reply(550, "Data connection"); 2752 else 2753 reply(226, "Transfer complete."); 2754 2755 transflag = 0; 2756 if (dout != NULL) 2757 (void) fclose(dout); 2758 else { 2759 if (pdata >= 0) 2760 close(pdata); 2761 } 2762 data = -1; 2763 pdata = -1; 2764out: 2765 if (freeglob) { 2766 freeglob = 0; 2767 globfree(&gl); 2768 } 2769} 2770 2771static void 2772reapchild(int signo) 2773{ 2774 int save_errno = errno; 2775 int rval; 2776 2777 do { 2778 rval = waitpid(-1, NULL, WNOHANG); 2779 } while (rval > 0 || (rval == -1 && errno == EINTR)); 2780 errno = save_errno; 2781} 2782 2783void 2784logxfer(char *name, off_t size, time_t start) 2785{ 2786 char buf[400 + MAXHOSTNAMELEN*4 + MAXPATHLEN*4]; 2787 char dir[MAXPATHLEN], path[MAXPATHLEN], rpath[MAXPATHLEN]; 2788 char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; 2789 char *vpw; 2790 time_t now; 2791 int len; 2792 2793 if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) { 2794 time(&now); 2795 2796 vpw = malloc(strlen(guest ? guestpw : pw->pw_name) * 4 + 1); 2797 if (vpw == NULL) 2798 return; 2799 2800 snprintf(path, sizeof(path), "%s/%s", dir, name); 2801 if (realpath(path, rpath) == NULL) 2802 strlcpy(rpath, path, sizeof(rpath)); 2803 strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH); 2804 2805 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2806 strvis(vpw, guest? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2807 2808 len = snprintf(buf, sizeof(buf), 2809 "%.24s %d %s %qd %s %c %s %c %c %s ftp %d %s %s\n", 2810 ctime(&now), now - start + (now == start), 2811 vremotehost, (long long)size, vpath, 2812 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2813 'o', ((guest) ? 'a' : 'r'), 2814 vpw, 0 /* none yet */, 2815 ((guest) ? "*" : pw->pw_name), dhostname); 2816 2817 if (len >= sizeof(buf) || len == -1) { 2818 if ((len = strlen(buf)) == 0) 2819 return; /* should not happen */ 2820 buf[len - 1] = '\n'; 2821 } 2822 write(statfd, buf, len); 2823 free(vpw); 2824 } 2825} 2826 2827void 2828set_slave_signals(void) 2829{ 2830 struct sigaction sa; 2831 2832 sigemptyset(&sa.sa_mask); 2833 sa.sa_flags = SA_RESTART; 2834 2835 sa.sa_handler = SIG_DFL; 2836 (void) sigaction(SIGCHLD, &sa, NULL); 2837 2838 sa.sa_handler = sigurg; 2839 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 2840 (void) sigaction(SIGURG, &sa, NULL); 2841 2842 sigfillset(&sa.sa_mask); /* block all signals in handler */ 2843 sa.sa_flags = SA_RESTART; 2844 sa.sa_handler = sigquit; 2845 (void) sigaction(SIGHUP, &sa, NULL); 2846 (void) sigaction(SIGINT, &sa, NULL); 2847 (void) sigaction(SIGQUIT, &sa, NULL); 2848 (void) sigaction(SIGTERM, &sa, NULL); 2849 2850 sa.sa_handler = lostconn; 2851 (void) sigaction(SIGPIPE, &sa, NULL); 2852 2853 sa.sa_handler = toolong; 2854 (void) sigaction(SIGALRM, &sa, NULL); 2855 2856#ifdef F_SETOWN 2857 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 2858 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 2859#endif 2860} 2861 2862#if defined(TCPWRAPPERS) 2863static int 2864check_host(struct sockaddr *sa) 2865{ 2866 struct sockaddr_in *sin; 2867 struct hostent *hp; 2868 char *addr; 2869 2870 if (sa->sa_family != AF_INET) 2871 return 1; /*XXX*/ 2872 2873 sin = (struct sockaddr_in *)sa; 2874 hp = gethostbyaddr((char *)&sin->sin_addr, 2875 sizeof(struct in_addr), AF_INET); 2876 addr = inet_ntoa(sin->sin_addr); 2877 if (hp) { 2878 if (!hosts_ctl("ftpd", hp->h_name, addr, STRING_UNKNOWN)) { 2879 syslog(LOG_NOTICE, "tcpwrappers rejected: %s [%s]", 2880 hp->h_name, addr); 2881 return (0); 2882 } 2883 } else { 2884 if (!hosts_ctl("ftpd", STRING_UNKNOWN, addr, STRING_UNKNOWN)) { 2885 syslog(LOG_NOTICE, "tcpwrappers rejected: [%s]", addr); 2886 return (0); 2887 } 2888 } 2889 return (1); 2890} 2891#endif /* TCPWRAPPERS */ 2892 2893/* 2894 * Allocate space and return a copy of the specified dir. 2895 * If 'dir' begins with a tilde (~), expand it. 2896 */ 2897char * 2898copy_dir(char *dir, struct passwd *pw) 2899{ 2900 char *cp; 2901 char *newdir; 2902 char *user = NULL; 2903 size_t dirsiz; 2904 2905 /* Nothing to expand */ 2906 if (dir[0] != '~') 2907 return (strdup(dir)); 2908 2909 /* "dir" is of form ~user/some/dir, lookup user. */ 2910 if (dir[1] != '/' && dir[1] != '\0') { 2911 if ((cp = strchr(dir + 1, '/')) == NULL) 2912 cp = dir + strlen(dir); 2913 if ((user = malloc(cp - dir)) == NULL) 2914 return (NULL); 2915 strlcpy(user, dir + 1, cp - dir); 2916 2917 /* Only do lookup if it is a different user. */ 2918 if (strcmp(user, pw->pw_name) != 0) { 2919 if ((pw = getpwnam(user)) == NULL) { 2920 /* No such user, interpret literally */ 2921 free(user); 2922 return(strdup(dir)); 2923 } 2924 } 2925 } 2926 2927 /* 2928 * If there is no directory separator (/) then it is just pw_dir. 2929 * Otherwise, replace ~foo with pw_dir. 2930 */ 2931 if ((cp = strchr(dir + 1, '/')) == NULL) { 2932 newdir = strdup(pw->pw_dir); 2933 } else { 2934 dirsiz = strlen(cp) + strlen(pw->pw_dir) + 1; 2935 if ((newdir = malloc(dirsiz)) == NULL) { 2936 free(user); 2937 return (NULL); 2938 } 2939 strlcpy(newdir, pw->pw_dir, dirsiz); 2940 strlcat(newdir, cp, dirsiz); 2941 } 2942 2943 if (user) 2944 free(user); 2945 return(newdir); 2946} 2947