ftpd.c revision 1.164
1/* $OpenBSD: ftpd.c,v 1.164 2005/04/21 00:12:20 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 1.164 2005/04/21 00:12:20 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 "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, error, 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 perror_reply(550, name); 1194 goto done; 1195 } 1196 if (c == '\n') 1197 i++; 1198 } 1199 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1200 perror_reply(550, name); 1201 goto done; 1202 } 1203 } 1204 dout = dataconn(name, st.st_size, "w"); 1205 if (dout == NULL) 1206 goto done; 1207 time(&start); 1208 send_data(fin, dout, st.st_blksize, st.st_size, 1209 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 1210 if ((cmd == 0) && stats) 1211 logxfer(name, byte_count, start); 1212 (void) fclose(dout); 1213 data = -1; 1214done: 1215 if (pdata >= 0) 1216 (void) close(pdata); 1217 pdata = -1; 1218 if (cmd == 0) 1219 LOGBYTES("get", name, byte_count); 1220 (*closefunc)(fin); 1221} 1222 1223void 1224store(char *name, char *mode, int unique) 1225{ 1226 FILE *fout, *din; 1227 int (*closefunc)(FILE *); 1228 struct stat st; 1229 int fd; 1230 1231 if (restart_point && *mode != 'a') 1232 mode = "r+"; 1233 1234 if (unique && stat(name, &st) == 0) { 1235 char *nam; 1236 1237 fd = guniquefd(name, &nam); 1238 if (fd == -1) { 1239 LOGCMD(*mode == 'w' ? "put" : "append", name); 1240 return; 1241 } 1242 name = nam; 1243 fout = fdopen(fd, mode); 1244 } else 1245 fout = fopen(name, mode); 1246 1247 closefunc = fclose; 1248 if (fout == NULL) { 1249 perror_reply(553, name); 1250 LOGCMD(*mode == 'w' ? "put" : "append", name); 1251 return; 1252 } 1253 byte_count = -1; 1254 if (restart_point) { 1255 if (type == TYPE_A) { 1256 off_t i, n; 1257 int c; 1258 1259 n = restart_point; 1260 i = 0; 1261 while (i++ < n) { 1262 if ((c=getc(fout)) == EOF) { 1263 perror_reply(550, name); 1264 goto done; 1265 } 1266 if (c == '\n') 1267 i++; 1268 } 1269 /* 1270 * We must do this seek to "current" position 1271 * because we are changing from reading to 1272 * writing. 1273 */ 1274 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1275 perror_reply(550, name); 1276 goto done; 1277 } 1278 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1279 perror_reply(550, name); 1280 goto done; 1281 } 1282 } 1283 din = dataconn(name, (off_t)-1, "r"); 1284 if (din == NULL) 1285 goto done; 1286 if (receive_data(din, fout) == 0) { 1287 if (unique) 1288 reply(226, "Transfer complete (unique file name:%s).", 1289 name); 1290 else 1291 reply(226, "Transfer complete."); 1292 } 1293 (void) fclose(din); 1294 data = -1; 1295 pdata = -1; 1296done: 1297 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1298 (*closefunc)(fout); 1299} 1300 1301static FILE * 1302getdatasock(char *mode) 1303{ 1304 int on = 1, s, t, tries; 1305 1306 if (data >= 0) 1307 return (fdopen(data, mode)); 1308 sigprocmask (SIG_BLOCK, &allsigs, NULL); 1309 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1310 if (s < 0) 1311 goto bad; 1312 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1313 (char *) &on, sizeof(on)) < 0) 1314 goto bad; 1315 /* anchor socket to avoid multi-homing problems */ 1316 data_source = ctrl_addr; 1317 data_source.su_port = htons(20); /* ftp-data port */ 1318 for (tries = 1; ; tries++) { 1319 if (monitor_bind(s, (struct sockaddr *)&data_source, 1320 data_source.su_len) >= 0) 1321 break; 1322 if (errno != EADDRINUSE || tries > 10) 1323 goto bad; 1324 sleep(tries); 1325 } 1326 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1327 1328#ifdef IP_TOS 1329 if (ctrl_addr.su_family == AF_INET) { 1330 on = IPTOS_THROUGHPUT; 1331 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1332 sizeof(int)) < 0) 1333 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1334 } 1335#endif 1336#ifdef TCP_NOPUSH 1337 /* 1338 * Turn off push flag to keep sender TCP from sending short packets 1339 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1340 * to set the send buffer size as well, but that may not be desirable 1341 * in heavy-load situations. 1342 */ 1343 on = 1; 1344 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof(on)) < 0) 1345 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1346#endif 1347#ifdef SO_SNDBUF 1348 on = 65536; 1349 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof(on)) < 0) 1350 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1351#endif 1352 1353 return (fdopen(s, mode)); 1354bad: 1355 /* Return the real value of errno (close may change it) */ 1356 t = errno; 1357 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1358 if (s >= 0) 1359 (void) close(s); 1360 errno = t; 1361 return (NULL); 1362} 1363 1364static FILE * 1365dataconn(char *name, off_t size, char *mode) 1366{ 1367 char sizebuf[32]; 1368 FILE *file; 1369 int retry = 0; 1370 in_port_t *p; 1371 u_char *fa, *ha; 1372 int alen; 1373 int error; 1374 1375 file_size = size; 1376 byte_count = 0; 1377 if (size != (off_t) -1) { 1378 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1379 size); 1380 } else 1381 sizebuf[0] = '\0'; 1382 if (pdata >= 0) { 1383 union sockunion from; 1384 int s; 1385 socklen_t fromlen = sizeof(from); 1386 1387 (void) alarm ((unsigned) timeout); 1388 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1389 (void) alarm (0); 1390 if (s < 0) { 1391 reply(425, "Can't open data connection."); 1392 (void) close(pdata); 1393 pdata = -1; 1394 return (NULL); 1395 } 1396 switch (from.su_family) { 1397 case AF_INET: 1398 p = (in_port_t *)&from.su_sin.sin_port; 1399 fa = (u_char *)&from.su_sin.sin_addr; 1400 ha = (u_char *)&his_addr.su_sin.sin_addr; 1401 alen = sizeof(struct in_addr); 1402 break; 1403 case AF_INET6: 1404 p = (in_port_t *)&from.su_sin6.sin6_port; 1405 fa = (u_char *)&from.su_sin6.sin6_addr; 1406 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1407 alen = sizeof(struct in6_addr); 1408 break; 1409 default: 1410 perror_reply(425, "Can't build data connection"); 1411 (void) close(pdata); 1412 (void) close(s); 1413 pdata = -1; 1414 return (NULL); 1415 } 1416 if (from.su_family != his_addr.su_family || 1417 ntohs(*p) < IPPORT_RESERVED) { 1418 perror_reply(425, "Can't build data connection"); 1419 (void) close(pdata); 1420 (void) close(s); 1421 pdata = -1; 1422 return (NULL); 1423 } 1424 if (portcheck && memcmp(fa, ha, alen) != 0) { 1425 perror_reply(435, "Can't build data connection"); 1426 (void) close(pdata); 1427 (void) close(s); 1428 pdata = -1; 1429 return (NULL); 1430 } 1431 (void) close(pdata); 1432 pdata = s; 1433 reply(150, "Opening %s mode data connection for '%s'%s.", 1434 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1435 return (fdopen(pdata, mode)); 1436 } 1437 if (data >= 0) { 1438 reply(125, "Using existing data connection for '%s'%s.", 1439 name, sizebuf); 1440 usedefault = 1; 1441 return (fdopen(data, mode)); 1442 } 1443 if (usedefault) 1444 data_dest = his_addr; 1445 usedefault = 1; 1446 do { 1447 file = getdatasock(mode); 1448 if (file == NULL) { 1449 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1450 1451 error = getnameinfo((struct sockaddr *)&data_source, 1452 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 1453 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV); 1454 if (error != 0) 1455 reply(425, "Can't create data socket: %s.", 1456 strerror(errno)); 1457 else 1458 reply(425, 1459 "Can't create data socket (%s,%s): %s.", 1460 hbuf, pbuf, strerror(errno)); 1461 return (NULL); 1462 } 1463 1464 /* 1465 * attempt to connect to reserved port on client machine; 1466 * this looks like an attack 1467 */ 1468 switch (data_dest.su_family) { 1469 case AF_INET: 1470 p = (in_port_t *)&data_dest.su_sin.sin_port; 1471 fa = (u_char *)&data_dest.su_sin.sin_addr; 1472 ha = (u_char *)&his_addr.su_sin.sin_addr; 1473 alen = sizeof(struct in_addr); 1474 break; 1475 case AF_INET6: 1476 p = (in_port_t *)&data_dest.su_sin6.sin6_port; 1477 fa = (u_char *)&data_dest.su_sin6.sin6_addr; 1478 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1479 alen = sizeof(struct in6_addr); 1480 break; 1481 default: 1482 perror_reply(425, "Can't build data connection"); 1483 (void) fclose(file); 1484 pdata = -1; 1485 return (NULL); 1486 } 1487 if (data_dest.su_family != his_addr.su_family || 1488 ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */ 1489 perror_reply(425, "Can't build data connection"); 1490 (void) fclose(file); 1491 return NULL; 1492 } 1493 if (portcheck && memcmp(fa, ha, alen) != 0) { 1494 perror_reply(435, "Can't build data connection"); 1495 (void) fclose(file); 1496 return NULL; 1497 } 1498 1499 if (connect(fileno(file), (struct sockaddr *)&data_dest, 1500 data_dest.su_len) == 0) { 1501 reply(150, "Opening %s mode data connection for '%s'%s.", 1502 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1503 data = fileno(file); 1504 return (file); 1505 } 1506 if (errno != EADDRINUSE) 1507 break; 1508 (void) fclose(file); 1509 sleep((unsigned) swaitint); 1510 retry += swaitint; 1511 } while (retry <= swaitmax); 1512 perror_reply(425, "Can't build data connection"); 1513 (void) fclose(file); 1514 return (NULL); 1515} 1516 1517/* 1518 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1519 * encapsulation of the data subject to Mode, Structure, and Type. 1520 * 1521 * NB: Form isn't handled. 1522 */ 1523static int 1524send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1525{ 1526 int c, cnt, filefd, netfd; 1527 char *buf, *bp; 1528 size_t len; 1529 1530 transflag++; 1531 switch (type) { 1532 1533 case TYPE_A: 1534 while ((c = getc(instr)) != EOF) { 1535 if (recvurg) 1536 goto got_oob; 1537 byte_count++; 1538 if (c == '\n') { 1539 if (ferror(outstr)) 1540 goto data_err; 1541 (void) putc('\r', outstr); 1542 } 1543 (void) putc(c, outstr); 1544 } 1545 fflush(outstr); 1546 transflag = 0; 1547 if (ferror(instr)) 1548 goto file_err; 1549 if (ferror(outstr)) 1550 goto data_err; 1551 reply(226, "Transfer complete."); 1552 return(0); 1553 1554 case TYPE_I: 1555 case TYPE_L: 1556 /* 1557 * isreg is only set if we are not doing restart and we 1558 * are sending a regular file 1559 */ 1560 netfd = fileno(outstr); 1561 filefd = fileno(instr); 1562 1563 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1564 buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd, 1565 (off_t)0); 1566 if (buf == MAP_FAILED) { 1567 syslog(LOG_WARNING, "mmap(%lu): %m", 1568 (unsigned long)filesize); 1569 goto oldway; 1570 } 1571 bp = buf; 1572 len = filesize; 1573 do { 1574 cnt = write(netfd, bp, len); 1575 if (recvurg) { 1576 munmap(buf, (size_t)filesize); 1577 goto got_oob; 1578 } 1579 len -= cnt; 1580 bp += cnt; 1581 if (cnt > 0) 1582 byte_count += cnt; 1583 } while(cnt > 0 && len > 0); 1584 1585 transflag = 0; 1586 munmap(buf, (size_t)filesize); 1587 if (cnt < 0) 1588 goto data_err; 1589 reply(226, "Transfer complete."); 1590 return(0); 1591 } 1592 1593oldway: 1594 if ((buf = malloc((u_int)blksize)) == NULL) { 1595 transflag = 0; 1596 perror_reply(451, "Local resource failure: malloc"); 1597 return(-1); 1598 } 1599 1600 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1601 write(netfd, buf, cnt) == cnt) 1602 byte_count += cnt; 1603 transflag = 0; 1604 (void)free(buf); 1605 if (cnt != 0) { 1606 if (cnt < 0) 1607 goto file_err; 1608 goto data_err; 1609 } 1610 reply(226, "Transfer complete."); 1611 return(0); 1612 default: 1613 transflag = 0; 1614 reply(550, "Unimplemented TYPE %d in send_data", type); 1615 return(-1); 1616 } 1617 1618data_err: 1619 transflag = 0; 1620 perror_reply(426, "Data connection"); 1621 return(-1); 1622 1623file_err: 1624 transflag = 0; 1625 perror_reply(551, "Error on input file"); 1626 return(-1); 1627 1628got_oob: 1629 myoob(); 1630 recvurg = 0; 1631 transflag = 0; 1632 return(-1); 1633} 1634 1635/* 1636 * Transfer data from peer to "outstr" using the appropriate encapulation of 1637 * the data subject to Mode, Structure, and Type. 1638 * 1639 * N.B.: Form isn't handled. 1640 */ 1641static int 1642receive_data(FILE *instr, FILE *outstr) 1643{ 1644 int c; 1645 int cnt; 1646 char buf[BUFSIZ]; 1647 struct sigaction sa, sa_saved; 1648 volatile int bare_lfs = 0; 1649 1650 transflag++; 1651 switch (type) { 1652 1653 case TYPE_I: 1654 case TYPE_L: 1655 memset(&sa, 0, sizeof(sa)); 1656 sigfillset(&sa.sa_mask); 1657 sa.sa_flags = SA_RESTART; 1658 sa.sa_handler = lostconn; 1659 (void) sigaction(SIGALRM, &sa, &sa_saved); 1660 do { 1661 (void) alarm ((unsigned) timeout); 1662 cnt = read(fileno(instr), buf, sizeof(buf)); 1663 (void) alarm (0); 1664 if (recvurg) 1665 goto got_oob; 1666 1667 if (cnt > 0) { 1668 if (write(fileno(outstr), buf, cnt) != cnt) 1669 goto file_err; 1670 byte_count += cnt; 1671 } 1672 } while (cnt > 0); 1673 (void) sigaction(SIGALRM, &sa_saved, NULL); 1674 if (cnt < 0) 1675 goto data_err; 1676 transflag = 0; 1677 return (0); 1678 1679 case TYPE_E: 1680 reply(553, "TYPE E not implemented."); 1681 transflag = 0; 1682 return (-1); 1683 1684 case TYPE_A: 1685 while ((c = getc(instr)) != EOF) { 1686 if (recvurg) 1687 goto got_oob; 1688 byte_count++; 1689 if (c == '\n') 1690 bare_lfs++; 1691 while (c == '\r') { 1692 if (ferror(outstr)) 1693 goto data_err; 1694 if ((c = getc(instr)) != '\n') { 1695 (void) putc ('\r', outstr); 1696 if (c == '\0' || c == EOF) 1697 goto contin2; 1698 } 1699 } 1700 (void) putc(c, outstr); 1701 contin2: ; 1702 } 1703 fflush(outstr); 1704 if (ferror(instr)) 1705 goto data_err; 1706 if (ferror(outstr)) 1707 goto file_err; 1708 transflag = 0; 1709 if (bare_lfs) { 1710 lreply(226, 1711 "WARNING! %d bare linefeeds received in ASCII mode", 1712 bare_lfs); 1713 printf(" File may not have transferred correctly.\r\n"); 1714 } 1715 return (0); 1716 default: 1717 reply(550, "Unimplemented TYPE %d in receive_data", type); 1718 transflag = 0; 1719 return (-1); 1720 } 1721 1722data_err: 1723 transflag = 0; 1724 perror_reply(426, "Data Connection"); 1725 return (-1); 1726 1727file_err: 1728 transflag = 0; 1729 perror_reply(452, "Error writing file"); 1730 return (-1); 1731 1732got_oob: 1733 myoob(); 1734 recvurg = 0; 1735 transflag = 0; 1736 return (-1); 1737} 1738 1739void 1740statfilecmd(char *filename) 1741{ 1742 FILE *fin; 1743 int c; 1744 int atstart; 1745 char line[LINE_MAX]; 1746 1747 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1748 fin = ftpd_popen(line, "r"); 1749 lreply(211, "status of %s:", filename); 1750 atstart = 1; 1751 while ((c = getc(fin)) != EOF) { 1752 if (c == '\n') { 1753 if (ferror(stdout)){ 1754 perror_reply(421, "control connection"); 1755 (void) ftpd_pclose(fin); 1756 dologout(1); 1757 /* NOTREACHED */ 1758 } 1759 if (ferror(fin)) { 1760 perror_reply(551, filename); 1761 (void) ftpd_pclose(fin); 1762 return; 1763 } 1764 (void) putc('\r', stdout); 1765 } 1766 if (atstart && isdigit(c)) 1767 (void) putc(' ', stdout); 1768 (void) putc(c, stdout); 1769 atstart = (c == '\n'); 1770 } 1771 (void) ftpd_pclose(fin); 1772 reply(211, "End of Status"); 1773} 1774 1775void 1776statcmd(void) 1777{ 1778 union sockunion *su; 1779 u_char *a, *p; 1780 char hbuf[MAXHOSTNAMELEN]; 1781 int ispassive; 1782 int error; 1783 1784 lreply(211, "%s FTP server status:", hostname); 1785 printf(" %s\r\n", version); 1786 error = getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1787 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST); 1788 printf(" Connected to %s", remotehost); 1789 if (error == 0 && strcmp(remotehost, hbuf) != 0) 1790 printf(" (%s)", hbuf); 1791 printf("\r\n"); 1792 if (logged_in) { 1793 if (guest) 1794 printf(" Logged in anonymously\r\n"); 1795 else 1796 printf(" Logged in as %s\r\n", pw->pw_name); 1797 } else if (askpasswd) 1798 printf(" Waiting for password\r\n"); 1799 else 1800 printf(" Waiting for user name\r\n"); 1801 printf(" TYPE: %s", typenames[type]); 1802 if (type == TYPE_A || type == TYPE_E) 1803 printf(", FORM: %s", formnames[form]); 1804 if (type == TYPE_L) 1805#if NBBY == 8 1806 printf(" %d", NBBY); 1807#else 1808 printf(" %d", bytesize); /* need definition! */ 1809#endif 1810 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1811 strunames[stru], modenames[mode]); 1812 ispassive = 0; 1813 if (data != -1) 1814 printf(" Data connection open\r\n"); 1815 else if (pdata != -1) { 1816 printf(" in Passive mode\r\n"); 1817 su = (union sockunion *)&pasv_addr; 1818 ispassive++; 1819 goto printaddr; 1820 } else if (usedefault == 0) { 1821 su = (union sockunion *)&data_dest; 1822printaddr: 1823 /* PASV/PORT */ 1824 if (su->su_family == AF_INET) { 1825 if (ispassive) 1826 printf("211- PASV "); 1827 else 1828 printf("211- PORT "); 1829 a = (u_char *) &su->su_sin.sin_addr; 1830 p = (u_char *) &su->su_sin.sin_port; 1831 printf("(%u,%u,%u,%u,%u,%u)\r\n", 1832 a[0], a[1], a[2], a[3], 1833 p[0], p[1]); 1834 } 1835 1836 /* LPSV/LPRT */ 1837 { 1838 int alen, af, i; 1839 1840 alen = 0; 1841 switch (su->su_family) { 1842 case AF_INET: 1843 a = (u_char *) &su->su_sin.sin_addr; 1844 p = (u_char *) &su->su_sin.sin_port; 1845 alen = sizeof(su->su_sin.sin_addr); 1846 af = 4; 1847 break; 1848 case AF_INET6: 1849 a = (u_char *) &su->su_sin6.sin6_addr; 1850 p = (u_char *) &su->su_sin6.sin6_port; 1851 alen = sizeof(su->su_sin6.sin6_addr); 1852 af = 6; 1853 break; 1854 default: 1855 af = 0; 1856 break; 1857 } 1858 if (af) { 1859 if (ispassive) 1860 printf("211- LPSV "); 1861 else 1862 printf("211- LPRT "); 1863 printf("(%u,%u", af, alen); 1864 for (i = 0; i < alen; i++) 1865 printf(",%u", a[i]); 1866 printf(",%u,%u,%u)\r\n", 2, p[0], p[1]); 1867 } 1868 } 1869 1870 /* EPRT/EPSV */ 1871 { 1872 u_char af; 1873 1874 switch (su->su_family) { 1875 case AF_INET: 1876 af = 1; 1877 break; 1878 case AF_INET6: 1879 af = 2; 1880 break; 1881 default: 1882 af = 0; 1883 break; 1884 } 1885 if (af) { 1886 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1887 union sockunion tmp = *su; 1888 1889 if (tmp.su_family == AF_INET6) 1890 tmp.su_sin6.sin6_scope_id = 0; 1891 if (getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 1892 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1893 NI_NUMERICHOST | NI_NUMERICSERV) == 0) { 1894 if (ispassive) 1895 printf("211- EPSV "); 1896 else 1897 printf("211- EPRT "); 1898 printf("(|%u|%s|%s|)\r\n", 1899 af, hbuf, pbuf); 1900 } 1901 } 1902 } 1903 } else 1904 printf(" No data connection\r\n"); 1905 reply(211, "End of status"); 1906} 1907 1908void 1909fatal(char *s) 1910{ 1911 1912 reply(451, "Error in server: %s", s); 1913 reply(221, "Closing connection due to server error."); 1914 dologout(0); 1915 /* NOTREACHED */ 1916} 1917 1918void 1919reply(int n, const char *fmt, ...) 1920{ 1921 char *buf, *p, *next; 1922 int rval; 1923 va_list ap; 1924 1925 va_start(ap, fmt); 1926 rval = vasprintf(&buf, fmt, ap); 1927 va_end(ap); 1928 if (rval == -1 || buf == NULL) { 1929 printf("412 Local resource failure: malloc\r\n"); 1930 fflush(stdout); 1931 dologout(1); 1932 } 1933 next = buf; 1934 while ((p = strsep(&next, "\n\r"))) { 1935 printf("%d%s %s\r\n", n, (next != '\0') ? "-" : "", p); 1936 if (debug) 1937 syslog(LOG_DEBUG, "<--- %d%s %s", n, 1938 (next != '\0') ? "-" : "", p); 1939 } 1940 (void)fflush(stdout); 1941 free(buf); 1942} 1943 1944 1945void 1946reply_r(int n, const char *fmt, ...) 1947{ 1948 char *p, *next; 1949 char msg[BUFSIZ]; 1950 char buf[BUFSIZ]; 1951 va_list ap; 1952 struct syslog_data sdata = SYSLOG_DATA_INIT; 1953 1954 va_start(ap, fmt); 1955 vsnprintf(msg, sizeof(msg), fmt, ap); 1956 va_end(ap); 1957 1958 next = msg; 1959 1960 while ((p = strsep(&next, "\n\r"))) { 1961 snprintf(buf, sizeof(buf), "%d%s %s\r\n", n, 1962 (next != '\0') ? "-" : "", p); 1963 write(STDOUT_FILENO, buf, strlen(buf)); 1964 if (debug) { 1965 buf[strlen(buf) - 2] = '\0'; 1966 syslog_r(LOG_DEBUG, &sdata, "<--- %s", buf); 1967 } 1968 } 1969} 1970 1971void 1972lreply(int n, const char *fmt, ...) 1973{ 1974 va_list ap; 1975 1976 va_start(ap, fmt); 1977 (void)printf("%d- ", n); 1978 (void)vprintf(fmt, ap); 1979 va_end(ap); 1980 (void)printf("\r\n"); 1981 (void)fflush(stdout); 1982 if (debug) { 1983 va_start(ap, fmt); 1984 syslog(LOG_DEBUG, "<--- %d- ", n); 1985 vsyslog(LOG_DEBUG, fmt, ap); 1986 va_end(ap); 1987 } 1988} 1989 1990static void 1991ack(char *s) 1992{ 1993 1994 reply(250, "%s command successful.", s); 1995} 1996 1997void 1998nack(char *s) 1999{ 2000 2001 reply(502, "%s command not implemented.", s); 2002} 2003 2004/* ARGSUSED */ 2005void 2006yyerror(char *s) 2007{ 2008 char *cp; 2009 2010 if ((cp = strchr(cbuf,'\n'))) 2011 *cp = '\0'; 2012 reply(500, "'%s': command not understood.", cbuf); 2013} 2014 2015void 2016delete(char *name) 2017{ 2018 struct stat st; 2019 2020 LOGCMD("delete", name); 2021 if (stat(name, &st) < 0) { 2022 perror_reply(550, name); 2023 return; 2024 } 2025 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2026 if (rmdir(name) < 0) { 2027 perror_reply(550, name); 2028 return; 2029 } 2030 goto done; 2031 } 2032 if (unlink(name) < 0) { 2033 perror_reply(550, name); 2034 return; 2035 } 2036done: 2037 ack("DELE"); 2038} 2039 2040void 2041cwd(char *path) 2042{ 2043 FILE *message; 2044 2045 if (chdir(path) < 0) 2046 perror_reply(550, path); 2047 else { 2048 if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) { 2049 char *cp, line[LINE_MAX]; 2050 2051 while (fgets(line, sizeof(line), message) != NULL) { 2052 if ((cp = strchr(line, '\n')) != NULL) 2053 *cp = '\0'; 2054 lreply(250, "%s", line); 2055 } 2056 (void) fflush(stdout); 2057 (void) fclose(message); 2058 } 2059 ack("CWD"); 2060 } 2061} 2062 2063void 2064replydirname(const char *name, const char *message) 2065{ 2066 char *p, *ep; 2067 char npath[MAXPATHLEN * 2]; 2068 2069 p = npath; 2070 ep = &npath[sizeof(npath) - 1]; 2071 while (*name) { 2072 if (*name == '"') { 2073 if (ep - p < 2) 2074 break; 2075 *p++ = *name++; 2076 *p++ = '"'; 2077 } else { 2078 if (ep - p < 1) 2079 break; 2080 *p++ = *name++; 2081 } 2082 } 2083 *p = '\0'; 2084 reply(257, "\"%s\" %s", npath, message); 2085} 2086 2087void 2088makedir(char *name) 2089{ 2090 2091 LOGCMD("mkdir", name); 2092 if (mkdir(name, 0777) < 0) 2093 perror_reply(550, name); 2094 else 2095 replydirname(name, "directory created."); 2096} 2097 2098void 2099removedir(char *name) 2100{ 2101 2102 LOGCMD("rmdir", name); 2103 if (rmdir(name) < 0) 2104 perror_reply(550, name); 2105 else 2106 ack("RMD"); 2107} 2108 2109void 2110pwd(void) 2111{ 2112 char path[MAXPATHLEN]; 2113 2114 if (getcwd(path, sizeof(path)) == NULL) 2115 perror_reply(550, "Can't get current directory"); 2116 else 2117 replydirname(path, "is current directory."); 2118} 2119 2120char * 2121renamefrom(char *name) 2122{ 2123 struct stat st; 2124 2125 if (stat(name, &st) < 0) { 2126 perror_reply(550, name); 2127 return ((char *)0); 2128 } 2129 reply(350, "File exists, ready for destination name"); 2130 return (name); 2131} 2132 2133void 2134renamecmd(char *from, char *to) 2135{ 2136 2137 LOGCMD2("rename", from, to); 2138 if (rename(from, to) < 0) 2139 perror_reply(550, "rename"); 2140 else 2141 ack("RNTO"); 2142} 2143 2144static void 2145dolog(struct sockaddr *sa) 2146{ 2147 char hbuf[sizeof(remotehost)]; 2148 2149 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0) == 0) 2150 (void) strlcpy(remotehost, hbuf, sizeof(remotehost)); 2151 else 2152 (void) strlcpy(remotehost, "unknown", sizeof(remotehost)); 2153 2154#ifdef HASSETPROCTITLE 2155 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2156 setproctitle("%s", proctitle); 2157#endif /* HASSETPROCTITLE */ 2158 2159 if (logging) 2160 syslog(LOG_INFO, "connection from %s", remotehost); 2161} 2162 2163/* 2164 * Record logout in wtmp file and exit with supplied status. 2165 * NOTE: because this is called from signal handlers it cannot 2166 * use stdio (or call other functions that use stdio). 2167 */ 2168void 2169dologout(int status) 2170{ 2171 2172 transflag = 0; 2173 2174 if (logged_in) { 2175 sigprocmask(SIG_BLOCK, &allsigs, NULL); 2176 ftpdlogwtmp(ttyline, "", ""); 2177 if (doutmp) 2178 ftpd_logout(utmp.ut_line); 2179 } 2180 /* beware of flushing buffers after a SIGPIPE */ 2181 _exit(status); 2182} 2183 2184static void 2185sigurg(int signo) 2186{ 2187 2188 recvurg = 1; 2189} 2190 2191static void 2192myoob(void) 2193{ 2194 char *cp; 2195 2196 /* only process if transfer occurring */ 2197 if (!transflag) 2198 return; 2199 cp = tmpline; 2200 if (getline(cp, 7, stdin) == NULL) { 2201 reply(221, "You could at least say goodbye."); 2202 dologout(0); 2203 } 2204 upper(cp); 2205 if (strcmp(cp, "ABOR\r\n") == 0) { 2206 tmpline[0] = '\0'; 2207 reply(426, "Transfer aborted. Data connection closed."); 2208 reply(226, "Abort successful"); 2209 } 2210 if (strcmp(cp, "STAT\r\n") == 0) { 2211 tmpline[0] = '\0'; 2212 if (file_size != (off_t) -1) 2213 reply(213, "Status: %qd of %qd bytes transferred", 2214 byte_count, file_size); 2215 else 2216 reply(213, "Status: %qd bytes transferred", byte_count); 2217 } 2218} 2219 2220/* 2221 * Note: a response of 425 is not mentioned as a possible response to 2222 * the PASV command in RFC959. However, it has been blessed as 2223 * a legitimate response by Jon Postel in a telephone conversation 2224 * with Rick Adams on 25 Jan 89. 2225 */ 2226void 2227passive(void) 2228{ 2229 socklen_t len; 2230 int on; 2231 u_char *p, *a; 2232 2233 if (pw == NULL) { 2234 reply(530, "Please login with USER and PASS"); 2235 return; 2236 } 2237 if (pdata >= 0) 2238 close(pdata); 2239 /* 2240 * XXX 2241 * At this point, it would be nice to have an algorithm that 2242 * inserted a growing delay in an attack scenario. Such a thing 2243 * would look like continual passive sockets being opened, but 2244 * nothing serious being done with them. They're not used to 2245 * move data; the entire attempt is just to use tcp FIN_WAIT 2246 * resources. 2247 */ 2248 pdata = socket(AF_INET, SOCK_STREAM, 0); 2249 if (pdata < 0) { 2250 perror_reply(425, "Can't open passive connection"); 2251 return; 2252 } 2253 2254 on = IP_PORTRANGE_HIGH; 2255 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2256 (char *)&on, sizeof(on)) < 0) 2257 goto pasv_error; 2258 2259 pasv_addr = ctrl_addr; 2260 pasv_addr.su_sin.sin_port = 0; 2261 if (bind(pdata, (struct sockaddr *)&pasv_addr, 2262 pasv_addr.su_len) < 0) 2263 goto pasv_error; 2264 2265 len = sizeof(pasv_addr); 2266 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2267 goto pasv_error; 2268 if (listen(pdata, 1) < 0) 2269 goto pasv_error; 2270 a = (u_char *) &pasv_addr.su_sin.sin_addr; 2271 p = (u_char *) &pasv_addr.su_sin.sin_port; 2272 2273 reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0], 2274 a[1], a[2], a[3], p[0], p[1]); 2275 return; 2276 2277pasv_error: 2278 (void) close(pdata); 2279 pdata = -1; 2280 perror_reply(425, "Can't open passive connection"); 2281 return; 2282} 2283 2284/* 2285 * convert protocol identifier to/from AF 2286 */ 2287int 2288lpsvproto2af(int proto) 2289{ 2290 2291 switch (proto) { 2292 case 4: return AF_INET; 2293#ifdef INET6 2294 case 6: return AF_INET6; 2295#endif 2296 default: return -1; 2297 } 2298} 2299 2300int 2301af2lpsvproto(int af) 2302{ 2303 2304 switch (af) { 2305 case AF_INET: return 4; 2306#ifdef INET6 2307 case AF_INET6: return 6; 2308#endif 2309 default: return -1; 2310 } 2311} 2312 2313int 2314epsvproto2af(int proto) 2315{ 2316 2317 switch (proto) { 2318 case 1: return AF_INET; 2319#ifdef INET6 2320 case 2: return AF_INET6; 2321#endif 2322 default: return -1; 2323 } 2324} 2325 2326int 2327af2epsvproto(int af) 2328{ 2329 2330 switch (af) { 2331 case AF_INET: return 1; 2332#ifdef INET6 2333 case AF_INET6: return 2; 2334#endif 2335 default: return -1; 2336 } 2337} 2338 2339/* 2340 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2341 * 229 Entering Extended Passive Mode (|||port|) 2342 */ 2343void 2344long_passive(char *cmd, int pf) 2345{ 2346 socklen_t len; 2347 int on; 2348 u_char *p, *a; 2349 2350 if (!logged_in) { 2351 syslog(LOG_NOTICE, "long passive but not logged in"); 2352 reply(503, "Login with USER first."); 2353 return; 2354 } 2355 2356 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2357 /* 2358 * XXX 2359 * only EPRT/EPSV ready clients will understand this 2360 */ 2361 if (strcmp(cmd, "EPSV") != 0) 2362 reply(501, "Network protocol mismatch"); /*XXX*/ 2363 else 2364 epsv_protounsupp("Network protocol mismatch"); 2365 2366 return; 2367 } 2368 2369 if (pdata >= 0) 2370 close(pdata); 2371 /* 2372 * XXX 2373 * At this point, it would be nice to have an algorithm that 2374 * inserted a growing delay in an attack scenario. Such a thing 2375 * would look like continual passive sockets being opened, but 2376 * nothing serious being done with them. They not used to move 2377 * data; the entire attempt is just to use tcp FIN_WAIT 2378 * resources. 2379 */ 2380 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2381 if (pdata < 0) { 2382 perror_reply(425, "Can't open passive connection"); 2383 return; 2384 } 2385 2386 switch (ctrl_addr.su_family) { 2387 case AF_INET: 2388 on = IP_PORTRANGE_HIGH; 2389 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2390 (char *)&on, sizeof(on)) < 0) 2391 goto pasv_error; 2392 break; 2393 case AF_INET6: 2394 on = IPV6_PORTRANGE_HIGH; 2395 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2396 (char *)&on, sizeof(on)) < 0) 2397 goto pasv_error; 2398 break; 2399 } 2400 2401 pasv_addr = ctrl_addr; 2402 pasv_addr.su_port = 0; 2403 if (bind(pdata, (struct sockaddr *) &pasv_addr, pasv_addr.su_len) < 0) 2404 goto pasv_error; 2405 len = pasv_addr.su_len; 2406 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2407 goto pasv_error; 2408 if (listen(pdata, 1) < 0) 2409 goto pasv_error; 2410 p = (u_char *) &pasv_addr.su_port; 2411 2412 if (strcmp(cmd, "LPSV") == 0) { 2413 switch (pasv_addr.su_family) { 2414 case AF_INET: 2415 a = (u_char *) &pasv_addr.su_sin.sin_addr; 2416 reply(228, 2417 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2418 4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]); 2419 return; 2420 case AF_INET6: 2421 a = (u_char *) &pasv_addr.su_sin6.sin6_addr; 2422 reply(228, 2423 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u," 2424 "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2425 6, 16, a[0], a[1], a[2], a[3], a[4], 2426 a[5], a[6], a[7], a[8], a[9], a[10], 2427 a[11], a[12], a[13], a[14], a[15], 2428 2, p[0], p[1]); 2429 return; 2430 } 2431 } else if (strcmp(cmd, "EPSV") == 0) { 2432 switch (pasv_addr.su_family) { 2433 case AF_INET: 2434 case AF_INET6: 2435 reply(229, "Entering Extended Passive Mode (|||%u|)", 2436 ntohs(pasv_addr.su_port)); 2437 return; 2438 } 2439 } else { 2440 /* more proper error code? */ 2441 } 2442 2443 pasv_error: 2444 (void) close(pdata); 2445 pdata = -1; 2446 perror_reply(425, "Can't open passive connection"); 2447 return; 2448} 2449 2450/* 2451 * EPRT |proto|addr|port| 2452 */ 2453int 2454extended_port(const char *arg) 2455{ 2456 char *tmp = NULL; 2457 char *result[3]; 2458 char *p, *q; 2459 char delim; 2460 struct addrinfo hints; 2461 struct addrinfo *res = NULL; 2462 int i; 2463 unsigned long proto; 2464 2465 if (epsvall) { 2466 reply(501, "EPRT disallowed after EPSV ALL"); 2467 return -1; 2468 } 2469 2470 usedefault = 0; 2471 if (pdata >= 0) { 2472 (void) close(pdata); 2473 pdata = -1; 2474 } 2475 2476 tmp = strdup(arg); 2477 if (!tmp) { 2478 fatal("not enough core."); 2479 /*NOTREACHED*/ 2480 } 2481 p = tmp; 2482 delim = p[0]; 2483 p++; 2484 memset(result, 0, sizeof(result)); 2485 for (i = 0; i < 3; i++) { 2486 q = strchr(p, delim); 2487 if (!q || *q != delim) 2488 goto parsefail; 2489 *q++ = '\0'; 2490 result[i] = p; 2491 p = q; 2492 } 2493 2494 /* some more sanity check */ 2495 p = NULL; 2496 (void)strtoul(result[2], &p, 10); 2497 if (!*result[2] || *p) 2498 goto protounsupp; 2499 p = NULL; 2500 proto = strtoul(result[0], &p, 10); 2501 if (!*result[0] || *p) 2502 goto protounsupp; 2503 2504 memset(&hints, 0, sizeof(hints)); 2505 hints.ai_family = epsvproto2af((int)proto); 2506 if (hints.ai_family < 0) 2507 goto protounsupp; 2508 hints.ai_socktype = SOCK_STREAM; 2509 hints.ai_flags = AI_NUMERICHOST; /*no DNS*/ 2510 if (getaddrinfo(result[1], result[2], &hints, &res)) 2511 goto parsefail; 2512 if (res->ai_next) 2513 goto parsefail; 2514 if (sizeof(data_dest) < res->ai_addrlen) 2515 goto parsefail; 2516 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2517 if (his_addr.su_family == AF_INET6 && 2518 data_dest.su_family == AF_INET6) { 2519 /* XXX more sanity checks! */ 2520 data_dest.su_sin6.sin6_scope_id = 2521 his_addr.su_sin6.sin6_scope_id; 2522 } 2523 if (pdata >= 0) { 2524 (void) close(pdata); 2525 pdata = -1; 2526 } 2527 reply(200, "EPRT command successful."); 2528 2529 if (tmp) 2530 free(tmp); 2531 if (res) 2532 freeaddrinfo(res); 2533 return 0; 2534 2535parsefail: 2536 reply(500, "Invalid argument, rejected."); 2537 usedefault = 1; 2538 if (tmp) 2539 free(tmp); 2540 if (res) 2541 freeaddrinfo(res); 2542 return -1; 2543 2544protounsupp: 2545 epsv_protounsupp("Protocol not supported"); 2546 usedefault = 1; 2547 if (tmp) 2548 free(tmp); 2549 if (res) 2550 freeaddrinfo(res); 2551 return -1; 2552} 2553 2554/* 2555 * 522 Protocol not supported (proto,...) 2556 * as we assume address family for control and data connections are the same, 2557 * we do not return the list of address families we support - instead, we 2558 * return the address family of the control connection. 2559 */ 2560void 2561epsv_protounsupp(const char *message) 2562{ 2563 int proto; 2564 2565 proto = af2epsvproto(ctrl_addr.su_family); 2566 if (proto < 0) 2567 reply(501, "%s", message); /*XXX*/ 2568 else 2569 reply(522, "%s, use (%d)", message, proto); 2570} 2571 2572/* 2573 * Generate unique name for file with basename "local". 2574 * The file named "local" is already known to exist. 2575 * Generates failure reply on error. 2576 */ 2577static int 2578guniquefd(char *local, char **nam) 2579{ 2580 static char new[MAXPATHLEN]; 2581 struct stat st; 2582 int count, len, fd; 2583 char *cp; 2584 2585 cp = strrchr(local, '/'); 2586 if (cp) 2587 *cp = '\0'; 2588 if (stat(cp ? local : ".", &st) < 0) { 2589 perror_reply(553, cp ? local : "."); 2590 return (-1); 2591 } 2592 if (cp) 2593 *cp = '/'; 2594 len = strlcpy(new, local, sizeof(new)); 2595 if (len+2+1 >= sizeof(new)-1) 2596 return (-1); 2597 cp = new + len; 2598 *cp++ = '.'; 2599 for (count = 1; count < 100; count++) { 2600 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 2601 fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666); 2602 if (fd == -1) 2603 continue; 2604 if (nam) 2605 *nam = new; 2606 return (fd); 2607 } 2608 reply(452, "Unique file name cannot be created."); 2609 return (-1); 2610} 2611 2612/* 2613 * Format and send reply containing system error number. 2614 */ 2615void 2616perror_reply(int code, char *string) 2617{ 2618 2619 reply(code, "%s: %s.", string, strerror(errno)); 2620} 2621 2622static char *onefile[] = { 2623 "", 2624 0 2625}; 2626 2627void 2628send_file_list(char *whichf) 2629{ 2630 struct stat st; 2631 DIR *dirp = NULL; 2632 struct dirent *dir; 2633 FILE *dout = NULL; 2634 char **dirlist; 2635 char *dirname; 2636 int simple = 0; 2637 volatile int freeglob = 0; 2638 glob_t gl; 2639 2640 if (strpbrk(whichf, "~{[*?") != NULL) { 2641 memset(&gl, 0, sizeof(gl)); 2642 freeglob = 1; 2643 if (glob(whichf, 2644 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, 2645 0, &gl)) { 2646 reply(550, "not found"); 2647 goto out; 2648 } else if (gl.gl_pathc == 0) { 2649 errno = ENOENT; 2650 perror_reply(550, whichf); 2651 goto out; 2652 } 2653 dirlist = gl.gl_pathv; 2654 } else { 2655 onefile[0] = whichf; 2656 dirlist = onefile; 2657 simple = 1; 2658 } 2659 2660 while ((dirname = *dirlist++)) { 2661 if (stat(dirname, &st) < 0) { 2662 /* 2663 * If user typed "ls -l", etc, and the client 2664 * used NLST, do what the user meant. 2665 */ 2666 if (dirname[0] == '-' && *dirlist == NULL && 2667 transflag == 0) { 2668 retrieve("/bin/ls %s", dirname); 2669 goto out; 2670 } 2671 perror_reply(550, whichf); 2672 if (dout != NULL) { 2673 (void) fclose(dout); 2674 transflag = 0; 2675 data = -1; 2676 pdata = -1; 2677 } 2678 goto out; 2679 } 2680 2681 if (S_ISREG(st.st_mode)) { 2682 if (dout == NULL) { 2683 dout = dataconn("file list", (off_t)-1, "w"); 2684 if (dout == NULL) 2685 goto out; 2686 transflag++; 2687 } 2688 fprintf(dout, "%s%s\n", dirname, 2689 type == TYPE_A ? "\r" : ""); 2690 byte_count += strlen(dirname) + 1; 2691 continue; 2692 } else if (!S_ISDIR(st.st_mode)) 2693 continue; 2694 2695 if ((dirp = opendir(dirname)) == NULL) 2696 continue; 2697 2698 while ((dir = readdir(dirp)) != NULL) { 2699 char nbuf[MAXPATHLEN]; 2700 2701 if (recvurg) { 2702 myoob(); 2703 recvurg = 0; 2704 transflag = 0; 2705 goto out; 2706 } 2707 2708 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2709 continue; 2710 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2711 dir->d_namlen == 2) 2712 continue; 2713 2714 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 2715 dir->d_name); 2716 2717 /* 2718 * We have to do a stat to insure it's 2719 * not a directory or special file. 2720 */ 2721 if (simple || (stat(nbuf, &st) == 0 && 2722 S_ISREG(st.st_mode))) { 2723 if (dout == NULL) { 2724 dout = dataconn("file list", (off_t)-1, 2725 "w"); 2726 if (dout == NULL) 2727 goto out; 2728 transflag++; 2729 } 2730 if (nbuf[0] == '.' && nbuf[1] == '/') 2731 fprintf(dout, "%s%s\n", &nbuf[2], 2732 type == TYPE_A ? "\r" : ""); 2733 else 2734 fprintf(dout, "%s%s\n", nbuf, 2735 type == TYPE_A ? "\r" : ""); 2736 byte_count += strlen(nbuf) + 1; 2737 } 2738 } 2739 (void) closedir(dirp); 2740 } 2741 2742 if (dout == NULL) 2743 reply(550, "No files found."); 2744 else if (ferror(dout) != 0) 2745 perror_reply(550, "Data connection"); 2746 else 2747 reply(226, "Transfer complete."); 2748 2749 transflag = 0; 2750 if (dout != NULL) 2751 (void) fclose(dout); 2752 else { 2753 if (pdata >= 0) 2754 close(pdata); 2755 } 2756 data = -1; 2757 pdata = -1; 2758out: 2759 if (freeglob) { 2760 freeglob = 0; 2761 globfree(&gl); 2762 } 2763} 2764 2765static void 2766reapchild(int signo) 2767{ 2768 int save_errno = errno; 2769 int rval; 2770 2771 do { 2772 rval = waitpid(-1, NULL, WNOHANG); 2773 } while (rval > 0 || (rval == -1 && errno == EINTR)); 2774 errno = save_errno; 2775} 2776 2777void 2778logxfer(char *name, off_t size, time_t start) 2779{ 2780 char buf[400 + MAXHOSTNAMELEN*4 + MAXPATHLEN*4]; 2781 char dir[MAXPATHLEN], path[MAXPATHLEN], rpath[MAXPATHLEN]; 2782 char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; 2783 char *vpw; 2784 time_t now; 2785 int len; 2786 2787 if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) { 2788 time(&now); 2789 2790 vpw = malloc(strlen(guest ? guestpw : pw->pw_name) * 4 + 1); 2791 if (vpw == NULL) 2792 return; 2793 2794 snprintf(path, sizeof(path), "%s/%s", dir, name); 2795 if (realpath(path, rpath) == NULL) 2796 strlcpy(rpath, path, sizeof(rpath)); 2797 strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH); 2798 2799 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2800 strvis(vpw, guest? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2801 2802 len = snprintf(buf, sizeof(buf), 2803 "%.24s %d %s %qd %s %c %s %c %c %s ftp %d %s %s\n", 2804 ctime(&now), now - start + (now == start), 2805 vremotehost, (long long)size, vpath, 2806 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2807 'o', ((guest) ? 'a' : 'r'), 2808 vpw, 0 /* none yet */, 2809 ((guest) ? "*" : pw->pw_name), dhostname); 2810 2811 if (len >= sizeof(buf) || len == -1) { 2812 if ((len = strlen(buf)) == 0) 2813 return; /* should not happen */ 2814 buf[len - 1] = '\n'; 2815 } 2816 write(statfd, buf, len); 2817 free(vpw); 2818 } 2819} 2820 2821void 2822set_slave_signals(void) 2823{ 2824 struct sigaction sa; 2825 2826 sigemptyset(&sa.sa_mask); 2827 sa.sa_flags = SA_RESTART; 2828 2829 sa.sa_handler = SIG_DFL; 2830 (void) sigaction(SIGCHLD, &sa, NULL); 2831 2832 sa.sa_handler = sigurg; 2833 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 2834 (void) sigaction(SIGURG, &sa, NULL); 2835 2836 sigfillset(&sa.sa_mask); /* block all signals in handler */ 2837 sa.sa_flags = SA_RESTART; 2838 sa.sa_handler = sigquit; 2839 (void) sigaction(SIGHUP, &sa, NULL); 2840 (void) sigaction(SIGINT, &sa, NULL); 2841 (void) sigaction(SIGQUIT, &sa, NULL); 2842 (void) sigaction(SIGTERM, &sa, NULL); 2843 2844 sa.sa_handler = lostconn; 2845 (void) sigaction(SIGPIPE, &sa, NULL); 2846 2847 sa.sa_handler = toolong; 2848 (void) sigaction(SIGALRM, &sa, NULL); 2849 2850#ifdef F_SETOWN 2851 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 2852 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 2853#endif 2854} 2855 2856#if defined(TCPWRAPPERS) 2857static int 2858check_host(struct sockaddr *sa) 2859{ 2860 struct sockaddr_in *sin; 2861 struct hostent *hp; 2862 char *addr; 2863 2864 if (sa->sa_family != AF_INET) 2865 return 1; /*XXX*/ 2866 2867 sin = (struct sockaddr_in *)sa; 2868 hp = gethostbyaddr((char *)&sin->sin_addr, 2869 sizeof(struct in_addr), AF_INET); 2870 addr = inet_ntoa(sin->sin_addr); 2871 if (hp) { 2872 if (!hosts_ctl("ftpd", hp->h_name, addr, STRING_UNKNOWN)) { 2873 syslog(LOG_NOTICE, "tcpwrappers rejected: %s [%s]", 2874 hp->h_name, addr); 2875 return (0); 2876 } 2877 } else { 2878 if (!hosts_ctl("ftpd", STRING_UNKNOWN, addr, STRING_UNKNOWN)) { 2879 syslog(LOG_NOTICE, "tcpwrappers rejected: [%s]", addr); 2880 return (0); 2881 } 2882 } 2883 return (1); 2884} 2885#endif /* TCPWRAPPERS */ 2886 2887/* 2888 * Allocate space and return a copy of the specified dir. 2889 * If 'dir' begins with a tilde (~), expand it. 2890 */ 2891char * 2892copy_dir(char *dir, struct passwd *pw) 2893{ 2894 char *cp; 2895 char *newdir; 2896 char *user = NULL; 2897 size_t dirsiz; 2898 2899 /* Nothing to expand */ 2900 if (dir[0] != '~') 2901 return (strdup(dir)); 2902 2903 /* "dir" is of form ~user/some/dir, lookup user. */ 2904 if (dir[1] != '/' && dir[1] != '\0') { 2905 if ((cp = strchr(dir + 1, '/')) == NULL) 2906 cp = dir + strlen(dir); 2907 if ((user = malloc(cp - dir)) == NULL) 2908 return (NULL); 2909 strlcpy(user, dir + 1, cp - dir); 2910 2911 /* Only do lookup if it is a different user. */ 2912 if (strcmp(user, pw->pw_name) != 0) { 2913 if ((pw = getpwnam(user)) == NULL) { 2914 /* No such user, interpret literally */ 2915 free(user); 2916 return(strdup(dir)); 2917 } 2918 } 2919 } 2920 2921 /* 2922 * If there is no directory separator (/) then it is just pw_dir. 2923 * Otherwise, replace ~foo with pw_dir. 2924 */ 2925 if ((cp = strchr(dir + 1, '/')) == NULL) { 2926 newdir = strdup(pw->pw_dir); 2927 } else { 2928 dirsiz = strlen(cp) + strlen(pw->pw_dir) + 1; 2929 if ((newdir = malloc(dirsiz)) == NULL) { 2930 free(user); 2931 return (NULL); 2932 } 2933 strlcpy(newdir, pw->pw_dir, dirsiz); 2934 strlcat(newdir, cp, dirsiz); 2935 } 2936 2937 if (user) 2938 free(user); 2939 return(newdir); 2940} 2941