ftpd.c revision 1.173
1/* $OpenBSD: ftpd.c,v 1.173 2006/10/18 21:46:09 millert 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 1.173 2006/10/18 21:46:09 millert 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 ctrl_addr; 134union sockunion data_source; 135union sockunion data_dest; 136union sockunion his_addr; 137union sockunion pasv_addr; 138 139sigset_t allsigs; 140 141int daemon_mode = 0; 142int data; 143int logged_in; 144struct passwd *pw; 145int debug = 0; 146int timeout = 900; /* timeout after 15 minutes of inactivity */ 147int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 148int logging; 149int anon_ok = 1; 150int anon_only = 0; 151int multihome = 0; 152int guest; 153int stats; 154int statfd = -1; 155int portcheck = 1; 156int dochroot; 157int type; 158int form; 159int stru; /* avoid C keyword */ 160int mode; 161int doutmp = 0; /* update utmp file */ 162int usedefault = 1; /* for data transfers */ 163int pdata = -1; /* for passive mode */ 164int family = AF_UNSPEC; 165volatile sig_atomic_t transflag; 166off_t file_size; 167off_t byte_count; 168#if !defined(CMASK) || CMASK == 0 169#undef CMASK 170#define CMASK 022 171#endif 172mode_t defumask = CMASK; /* default umask value */ 173int umaskchange = 1; /* allow user to change umask value. */ 174char tmpline[7]; 175char hostname[MAXHOSTNAMELEN]; 176char remotehost[MAXHOSTNAMELEN]; 177char dhostname[MAXHOSTNAMELEN]; 178char *guestpw; 179char ttyline[20]; 180#if 0 181char *tty = ttyline; /* for klogin */ 182#endif 183static struct utmp utmp; /* for utmp */ 184static login_cap_t *lc; 185static auth_session_t *as; 186static volatile sig_atomic_t recvurg; 187 188#if defined(TCPWRAPPERS) 189int allow_severity = LOG_INFO; 190int deny_severity = LOG_NOTICE; 191#endif /* TCPWRAPPERS */ 192 193char *ident = NULL; 194 195 196int epsvall = 0; 197 198/* 199 * Timeout intervals for retrying connections 200 * to hosts that don't accept PORT cmds. This 201 * is a kludge, but given the problems with TCP... 202 */ 203#define SWAITMAX 90 /* wait at most 90 seconds */ 204#define SWAITINT 5 /* interval between retries */ 205 206int swaitmax = SWAITMAX; 207int swaitint = SWAITINT; 208 209#ifdef HASSETPROCTITLE 210char proctitle[BUFSIZ]; /* initial part of title */ 211#endif /* HASSETPROCTITLE */ 212 213#define LOGCMD(cmd, file) \ 214 if (logging > 1) \ 215 syslog(LOG_INFO,"%s %s%s", cmd, \ 216 *(file) == '/' ? "" : curdir(), file); 217#define LOGCMD2(cmd, file1, file2) \ 218 if (logging > 1) \ 219 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 220 *(file1) == '/' ? "" : curdir(), file1, \ 221 *(file2) == '/' ? "" : curdir(), file2); 222#define LOGBYTES(cmd, file, cnt) \ 223 if (logging > 1) { \ 224 if (cnt == (off_t)-1) \ 225 syslog(LOG_INFO,"%s %s%s", cmd, \ 226 *(file) == '/' ? "" : curdir(), file); \ 227 else \ 228 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 229 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 230 } 231 232static void ack(char *); 233static void sigurg(int); 234static void myoob(void); 235static int checkuser(char *, char *); 236static FILE *dataconn(char *, off_t, char *); 237static void dolog(struct sockaddr *); 238static char *copy_dir(char *, struct passwd *); 239static char *curdir(void); 240static void end_login(void); 241static FILE *getdatasock(char *); 242static int guniquefd(char *, char **); 243static void lostconn(int); 244static void sigquit(int); 245static int receive_data(FILE *, FILE *); 246static void replydirname(const char *, const char *); 247static int send_data(FILE *, FILE *, off_t, off_t, int); 248static struct passwd * 249 sgetpwnam(char *, struct passwd *); 250static void reapchild(int); 251#if defined(TCPWRAPPERS) 252static int check_host(struct sockaddr *); 253#endif /* TCPWRAPPERS */ 254static void usage(void); 255 256void logxfer(char *, off_t, time_t); 257void set_slave_signals(void); 258 259static char * 260curdir(void) 261{ 262 static char path[MAXPATHLEN+1]; /* path + '/' */ 263 264 if (getcwd(path, sizeof(path)-1) == NULL) 265 return (""); 266 if (path[1] != '\0') /* special case for root dir. */ 267 strlcat(path, "/", sizeof path); 268 /* For guest account, skip / since it's chrooted */ 269 return (guest ? path+1 : path); 270} 271 272char *argstr = "AdDhnlMSt:T:u:UvP46"; 273 274static void 275usage(void) 276{ 277 syslog(LOG_ERR, 278 "usage: ftpd [-46ADdlMnPSU] [-T maxtimeout] [-t timeout] [-u mask]"); 279 exit(2); 280} 281 282int 283main(int argc, char *argv[]) 284{ 285 socklen_t addrlen; 286 int ch, on = 1, tos; 287 char *cp, line[LINE_MAX]; 288 FILE *fp; 289 struct hostent *hp; 290 struct sigaction sa; 291 int error = 0; 292 293 tzset(); /* in case no timezone database in ~ftp */ 294 sigfillset(&allsigs); /* used to block signals while root */ 295 sigemptyset(&sa.sa_mask); 296 sa.sa_flags = SA_RESTART; 297 298 while ((ch = getopt(argc, argv, argstr)) != -1) { 299 switch (ch) { 300 case 'A': 301 anon_only = 1; 302 break; 303 304 case 'd': 305 case 'v': /* deprecated */ 306 debug = 1; 307 break; 308 309 case 'D': 310 daemon_mode = 1; 311 break; 312 313 case 'P': 314 portcheck = 0; 315 break; 316 317 case 'h': /* deprecated */ 318 break; 319 320 case 'l': 321 logging++; /* > 1 == extra logging */ 322 break; 323 324 case 'M': 325 multihome = 1; 326 break; 327 328 case 'n': 329 anon_ok = 0; 330 break; 331 332 case 'S': 333 stats = 1; 334 break; 335 336 case 't': 337 timeout = atoi(optarg); 338 if (maxtimeout < timeout) 339 maxtimeout = timeout; 340 break; 341 342 case 'T': 343 maxtimeout = atoi(optarg); 344 if (timeout > maxtimeout) 345 timeout = maxtimeout; 346 break; 347 348 case 'u': 349 { 350 long val = 0; 351 char *p; 352 umaskchange = 0; 353 354 val = strtol(optarg, &p, 8); 355 if (*p != '\0' || val < 0 || (val & ~ACCESSPERMS)) { 356 syslog(LOG_ERR, 357 "%s is a bad value for -u, aborting..", 358 optarg); 359 exit(2); 360 } else 361 defumask = val; 362 break; 363 } 364 365 case 'U': 366 doutmp = 1; 367 break; 368 369 case '4': 370 family = AF_INET; 371 break; 372 373 case '6': 374 family = AF_INET6; 375 break; 376 377 default: 378 usage(); 379 break; 380 } 381 } 382 383 (void) freopen(_PATH_DEVNULL, "w", stderr); 384 385 /* 386 * LOG_NDELAY sets up the logging connection immediately, 387 * necessary for anonymous ftp's that chroot and can't do it later. 388 */ 389 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 390 391 if (getpwnam(FTPD_PRIVSEP_USER) == NULL) { 392 syslog(LOG_ERR, "privilege separation user %s not found", 393 FTPD_PRIVSEP_USER); 394 exit(1); 395 } 396 endpwent(); 397 398 if (daemon_mode) { 399 int *fds, i, fd; 400 struct pollfd *pfds; 401 struct addrinfo hints, *res, *res0; 402 nfds_t n; 403 404 /* 405 * Detach from parent. 406 */ 407 if (daemon(1, 1) < 0) { 408 syslog(LOG_ERR, "failed to become a daemon"); 409 exit(1); 410 } 411 sa.sa_handler = reapchild; 412 (void) sigaction(SIGCHLD, &sa, NULL); 413 414 memset(&hints, 0, sizeof(hints)); 415 hints.ai_family = family; 416 hints.ai_socktype = SOCK_STREAM; 417 hints.ai_protocol = IPPROTO_TCP; 418 hints.ai_flags = AI_PASSIVE; 419 error = getaddrinfo(NULL, "ftp", &hints, &res0); 420 if (error) { 421 syslog(LOG_ERR, "%s", gai_strerror(error)); 422 exit(1); 423 } 424 425 n = 0; 426 for (res = res0; res; res = res->ai_next) 427 n++; 428 429 fds = malloc(n * sizeof(int)); 430 pfds = malloc(n * sizeof(struct pollfd)); 431 if (!fds || !pfds) { 432 syslog(LOG_ERR, "%s", strerror(errno)); 433 exit(1); 434 } 435 436 /* 437 * Open sockets, bind it to the FTP port, and start 438 * listening. 439 */ 440 n = 0; 441 for (res = res0; res; res = res->ai_next) { 442 fds[n] = socket(res->ai_family, res->ai_socktype, 443 res->ai_protocol); 444 if (fds[n] < 0) 445 continue; 446 447 if (setsockopt(fds[n], SOL_SOCKET, SO_REUSEADDR, 448 &on, sizeof(on)) < 0) { 449 close(fds[n]); 450 fds[n] = -1; 451 continue; 452 } 453 454 if (bind(fds[n], res->ai_addr, res->ai_addrlen) < 0) { 455 close(fds[n]); 456 fds[n] = -1; 457 continue; 458 } 459 if (listen(fds[n], 32) < 0) { 460 close(fds[n]); 461 fds[n] = -1; 462 continue; 463 } 464 465 pfds[n].fd = fds[n]; 466 pfds[n].events = POLLIN; 467 n++; 468 } 469 freeaddrinfo(res0); 470 471 if (n == 0) { 472 syslog(LOG_ERR, "could not open control socket"); 473 exit(1); 474 } 475 476 /* Stash pid in pidfile */ 477 if (pidfile(NULL)) 478 syslog(LOG_ERR, "can't open pidfile: %m"); 479 /* 480 * Loop forever accepting connection requests and forking off 481 * children to handle them. 482 */ 483 while (1) { 484 if (poll(pfds, n, INFTIM) < 0) { 485 if (errno == EINTR) 486 continue; 487 syslog(LOG_ERR, "poll: %m"); 488 exit(1); 489 } 490 for (i = 0; i < n; i++) 491 if (pfds[i].revents & POLLIN) { 492 addrlen = sizeof(his_addr); 493 fd = accept(pfds[i].fd, 494 (struct sockaddr *)&his_addr, 495 &addrlen); 496 if (fd != -1) { 497 if (fork() == 0) 498 goto child; 499 close(fd); 500 } 501 } 502 } 503 504 child: 505 /* child */ 506 (void)dup2(fd, STDIN_FILENO); 507 (void)dup2(fd, STDOUT_FILENO); 508 for (i = 0; i < n; i++) 509 close(fds[i]); 510#if defined(TCPWRAPPERS) 511 /* ..in the child. */ 512 if (!check_host((struct sockaddr *)&his_addr)) 513 exit(1); 514#endif /* TCPWRAPPERS */ 515 } else { 516 addrlen = sizeof(his_addr); 517 if (getpeername(0, (struct sockaddr *)&his_addr, 518 &addrlen) < 0) { 519 /* syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); */ 520 exit(1); 521 } 522 } 523 524 /* set this here so klogin can use it... */ 525 (void)snprintf(ttyline, sizeof(ttyline), "ftp%ld", (long)getpid()); 526 527 set_slave_signals(); 528 529 addrlen = sizeof(ctrl_addr); 530 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 531 syslog(LOG_ERR, "getsockname: %m"); 532 exit(1); 533 } 534 if (his_addr.su_family == AF_INET6 && 535 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 536#if 1 537 /* 538 * IPv4 control connection arrived to AF_INET6 socket. 539 * I hate to do this, but this is the easiest solution. 540 */ 541 union sockunion tmp_addr; 542 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 543 544 tmp_addr = his_addr; 545 memset(&his_addr, 0, sizeof(his_addr)); 546 his_addr.su_sin.sin_family = AF_INET; 547 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 548 memcpy(&his_addr.su_sin.sin_addr, 549 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 550 sizeof(his_addr.su_sin.sin_addr)); 551 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 552 553 tmp_addr = ctrl_addr; 554 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 555 ctrl_addr.su_sin.sin_family = AF_INET; 556 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 557 memcpy(&ctrl_addr.su_sin.sin_addr, 558 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 559 sizeof(ctrl_addr.su_sin.sin_addr)); 560 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 561#else 562 while (fgets(line, sizeof(line), fd) != NULL) { 563 if ((cp = strchr(line, '\n')) != NULL) 564 *cp = '\0'; 565 lreply(530, "%s", line); 566 } 567 (void) fflush(stdout); 568 (void) close(fd); 569 reply(530, 570 "Connection from IPv4 mapped address is not supported."); 571 exit(0); 572#endif 573 } 574#ifdef IP_TOS 575 if (his_addr.su_family == AF_INET) { 576 tos = IPTOS_LOWDELAY; 577 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, 578 sizeof(int)) < 0) 579 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 580 } 581#endif 582 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 583 584 /* Try to handle urgent data inline */ 585#ifdef SO_OOBINLINE 586 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 587 syslog(LOG_ERR, "setsockopt: %m"); 588#endif 589 590 dolog((struct sockaddr *)&his_addr); 591 592 /* 593 * Set up default state 594 */ 595 data = -1; 596 type = TYPE_A; 597 form = FORM_N; 598 stru = STRU_F; 599 mode = MODE_S; 600 tmpline[0] = '\0'; 601 602 /* If logins are disabled, print out the message. */ 603 if ((fp = fopen(_PATH_NOLOGIN, "r")) != NULL) { 604 while (fgets(line, sizeof(line), fp) != NULL) { 605 if ((cp = strchr(line, '\n')) != NULL) 606 *cp = '\0'; 607 lreply(530, "%s", line); 608 } 609 (void) fflush(stdout); 610 (void) fclose(fp); 611 reply(530, "System not available."); 612 exit(0); 613 } 614 if ((fp = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 615 while (fgets(line, sizeof(line), fp) != NULL) { 616 if ((cp = strchr(line, '\n')) != NULL) 617 *cp = '\0'; 618 lreply(220, "%s", line); 619 } 620 (void) fflush(stdout); 621 (void) fclose(fp); 622 /* reply(220,) must follow */ 623 } 624 (void) gethostname(hostname, sizeof(hostname)); 625 626 /* Make sure hostname is fully qualified. */ 627 hp = gethostbyname(hostname); 628 if (hp != NULL) 629 strlcpy(hostname, hp->h_name, sizeof(hostname)); 630 631 if (multihome) { 632 error = getnameinfo((struct sockaddr *)&ctrl_addr, 633 ctrl_addr.su_len, dhostname, sizeof(dhostname), NULL, 0, 0); 634 } 635 636 if (error != 0) 637 reply(220, "FTP server (%s) ready.", version); 638 else 639 reply(220, "%s FTP server (%s) ready.", 640 (multihome ? dhostname : hostname), version); 641 642 monitor_init(); 643 644 for (;;) 645 (void) yyparse(); 646 /* NOTREACHED */ 647} 648 649/* 650 * Signal handlers. 651 */ 652/*ARGSUSED*/ 653static void 654lostconn(int signo) 655{ 656 struct syslog_data sdata = SYSLOG_DATA_INIT; 657 658 if (debug) 659 syslog_r(LOG_DEBUG, &sdata, "lost connection"); 660 dologout(1); 661} 662 663static void 664sigquit(int signo) 665{ 666 struct syslog_data sdata = SYSLOG_DATA_INIT; 667 668 syslog_r(LOG_ERR, &sdata, "got signal %s", sys_signame[signo]); 669 dologout(1); 670} 671 672/* 673 * Save the result of a getpwnam. Used for USER command, since 674 * the data returned must not be clobbered by any other command 675 * (e.g., globbing). 676 */ 677static struct passwd * 678sgetpwnam(char *name, struct passwd *pw) 679{ 680 static struct passwd *save; 681 struct passwd *old; 682 683 if (pw == NULL && (pw = getpwnam(name)) == NULL) 684 return (NULL); 685 old = save; 686 save = pw_dup(pw); 687 if (save == NULL) { 688 perror_reply(421, "Local resource failure: malloc"); 689 dologout(1); 690 /* NOTREACHED */ 691 } 692 if (old) { 693 memset(old->pw_passwd, 0, strlen(old->pw_passwd)); 694 free(old); 695 } 696 return (save); 697} 698 699static int login_attempts; /* number of failed login attempts */ 700static int askpasswd; /* had user command, ask for passwd */ 701static char curname[MAXLOGNAME]; /* current USER name */ 702 703/* 704 * USER command. 705 * Sets global passwd pointer pw if named account exists and is acceptable; 706 * sets askpasswd if a PASS command is expected. If logged in previously, 707 * need to reset state. If name is "ftp" or "anonymous", the name is not in 708 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 709 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 710 * requesting login privileges. Disallow anyone who does not have a standard 711 * shell as returned by getusershell(). Disallow anyone mentioned in the file 712 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 713 */ 714void 715user(char *name) 716{ 717 char *cp, *shell, *style, *host; 718 char *class = NULL; 719 720 if (logged_in) { 721 kill_slave(); 722 end_login(); 723 } 724 725 /* Close session from previous user if there was one. */ 726 if (as) { 727 auth_close(as); 728 as = NULL; 729 } 730 if (lc) { 731 login_close(lc); 732 lc = NULL; 733 } 734 735 if ((style = strchr(name, ':')) != NULL) 736 *style++ = 0; 737 738 guest = 0; 739 host = multihome ? dhostname : hostname; 740 if (anon_ok && 741 (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0)) { 742 if (checkuser(_PATH_FTPUSERS, "ftp") || 743 checkuser(_PATH_FTPUSERS, "anonymous")) 744 reply(530, "User %s access denied.", name); 745 else if ((pw = sgetpwnam("ftp", NULL)) != NULL) { 746 guest = 1; 747 askpasswd = 1; 748 lc = login_getclass(pw->pw_class); 749 if ((as = auth_open()) == NULL || 750 auth_setpwd(as, pw) != 0 || 751 auth_setoption(as, "FTPD_HOST", host) < 0) { 752 if (as) { 753 auth_close(as); 754 as = NULL; 755 } 756 login_close(lc); 757 lc = NULL; 758 reply(421, "Local resource failure"); 759 return; 760 } 761 reply(331, 762 "Guest login ok, send your email address as password."); 763 } else 764 reply(530, "User %s unknown.", name); 765 if (!askpasswd && logging) 766 syslog(LOG_NOTICE, 767 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 768 return; 769 } 770 771 shell = _PATH_BSHELL; 772 if ((pw = sgetpwnam(name, NULL))) { 773 class = pw->pw_class; 774 if (pw->pw_shell != NULL && *pw->pw_shell != '\0') 775 shell = pw->pw_shell; 776 while ((cp = getusershell()) != NULL) 777 if (strcmp(cp, shell) == 0) 778 break; 779 shell = cp; 780 endusershell(); 781 } 782 783 /* Get login class; if invalid style treat like unknown user. */ 784 lc = login_getclass(class); 785 if (lc && (style = login_getstyle(lc, style, "auth-ftp")) == NULL) { 786 login_close(lc); 787 lc = NULL; 788 pw = NULL; 789 } 790 791 /* Do pre-authentication setup. */ 792 if (lc && ((as = auth_open()) == NULL || 793 (pw != NULL && auth_setpwd(as, pw) != 0) || 794 auth_setitem(as, AUTHV_STYLE, style) < 0 || 795 auth_setitem(as, AUTHV_NAME, name) < 0 || 796 auth_setitem(as, AUTHV_CLASS, class) < 0 || 797 auth_setoption(as, "login", "yes") < 0 || 798 auth_setoption(as, "notickets", "yes") < 0 || 799 auth_setoption(as, "FTPD_HOST", host) < 0)) { 800 if (as) { 801 auth_close(as); 802 as = NULL; 803 } 804 login_close(lc); 805 lc = NULL; 806 reply(421, "Local resource failure"); 807 return; 808 } 809 if (logging) 810 strlcpy(curname, name, sizeof(curname)); 811 812 dochroot = (lc && login_getcapbool(lc, "ftp-chroot", 0)) || 813 checkuser(_PATH_FTPCHROOT, name); 814 if (anon_only && !dochroot) { 815 if (anon_ok) 816 reply(530, "Sorry, only anonymous ftp allowed."); 817 else 818 reply(530, "User %s access denied.", name); 819 return; 820 } 821 if (pw) { 822 if ((!shell && !dochroot) || checkuser(_PATH_FTPUSERS, name)) { 823 reply(530, "User %s access denied.", name); 824 if (logging) 825 syslog(LOG_NOTICE, 826 "FTP LOGIN REFUSED FROM %s, %s", 827 remotehost, name); 828 pw = NULL; 829 return; 830 } 831 } 832 833 if (as != NULL && (cp = auth_challenge(as)) != NULL) 834 reply(331, "%s", cp); 835 else 836 reply(331, "Password required for %s.", name); 837 838 askpasswd = 1; 839 /* 840 * Delay before reading passwd after first failed 841 * attempt to slow down passwd-guessing programs. 842 */ 843 if (login_attempts) 844 sleep((unsigned) login_attempts); 845} 846 847/* 848 * Check if a user is in the file "fname" 849 */ 850static int 851checkuser(char *fname, char *name) 852{ 853 FILE *fp; 854 int found = 0; 855 char *p, line[BUFSIZ]; 856 857 if ((fp = fopen(fname, "r")) != NULL) { 858 while (fgets(line, sizeof(line), fp) != NULL) 859 if ((p = strchr(line, '\n')) != NULL) { 860 *p = '\0'; 861 if (line[0] == '#') 862 continue; 863 if (strcmp(line, name) == 0) { 864 found = 1; 865 break; 866 } 867 } 868 (void) fclose(fp); 869 } 870 return (found); 871} 872 873/* 874 * Terminate login as previous user, if any, resetting state; 875 * used when USER command is given or login fails. 876 */ 877static void 878end_login(void) 879{ 880 sigprocmask (SIG_BLOCK, &allsigs, NULL); 881 if (logged_in) { 882 ftpdlogwtmp(ttyline, "", ""); 883 if (doutmp) 884 ftpd_logout(utmp.ut_line); 885 } 886 reply(530, "Please reconnect to work as another user"); 887 _exit(0); 888} 889 890enum auth_ret 891pass(char *passwd) 892{ 893 int authok; 894 unsigned int flags; 895 FILE *fp; 896 static char homedir[MAXPATHLEN]; 897 char *motd, *dir, rootdir[MAXPATHLEN]; 898 size_t sz_pw_dir; 899 900 if (logged_in || askpasswd == 0) { 901 reply(503, "Login with USER first."); 902 return (AUTH_FAILED); 903 } 904 askpasswd = 0; 905 if (!guest) { /* "ftp" is only account allowed no password */ 906 authok = 0; 907 if (pw == NULL || pw->pw_passwd[0] == '\0') { 908 useconds_t us; 909 910 /* Sleep between 1 and 3 seconds to emulate a crypt. */ 911 us = arc4random() % 3000000; 912 usleep(us); 913 if (as != NULL) { 914 auth_close(as); 915 as = NULL; 916 } 917 } else { 918 authok = auth_userresponse(as, passwd, 0); 919 as = NULL; 920 } 921 if (authok == 0) { 922 reply(530, "Login incorrect."); 923 if (logging) 924 syslog(LOG_NOTICE, 925 "FTP LOGIN FAILED FROM %s, %s", 926 remotehost, curname); 927 pw = NULL; 928 if (login_attempts++ >= 5) { 929 syslog(LOG_NOTICE, 930 "repeated login failures from %s", 931 remotehost); 932 kill_slave(); 933 _exit(0); 934 } 935 return (AUTH_FAILED); 936 } 937 } else if (lc != NULL) { 938 /* Save anonymous' password. */ 939 if (guestpw != NULL) 940 free(guestpw); 941 guestpw = strdup(passwd); 942 if (guestpw == NULL) { 943 kill_slave(); 944 fatal("Out of memory."); 945 } 946 947 authok = auth_approval(as, lc, pw->pw_name, "ftp"); 948 auth_close(as); 949 as = NULL; 950 if (authok == 0) { 951 syslog(LOG_INFO|LOG_AUTH, 952 "FTP LOGIN FAILED (HOST) as %s: approval failure.", 953 pw->pw_name); 954 reply(530, "Approval failure."); 955 kill_slave(); 956 _exit(0); 957 } 958 } else { 959 syslog(LOG_INFO|LOG_AUTH, 960 "FTP LOGIN CLASS %s MISSING for %s: approval failure.", 961 pw->pw_class, pw->pw_name); 962 reply(530, "Permission denied."); 963 kill_slave(); 964 _exit(0); 965 } 966 967 if (monitor_post_auth() == 1) { 968 /* Post-auth monitor process */ 969 logged_in = 1; 970 return (AUTH_MONITOR); 971 } 972 973 login_attempts = 0; /* this time successful */ 974 /* set umask via setusercontext() unless -u flag was given. */ 975 flags = LOGIN_SETGROUP|LOGIN_SETPRIORITY|LOGIN_SETRESOURCES; 976 if (umaskchange) 977 flags |= LOGIN_SETUMASK; 978 else 979 (void) umask(defumask); 980 if (setusercontext(lc, pw, (uid_t)0, flags) != 0) { 981 perror_reply(451, "Local resource failure: setusercontext"); 982 syslog(LOG_NOTICE, "setusercontext: %m"); 983 dologout(1); 984 /* NOTREACHED */ 985 } 986 987 /* open wtmp before chroot */ 988 ftpdlogwtmp(ttyline, pw->pw_name, remotehost); 989 990 /* open utmp before chroot */ 991 if (doutmp) { 992 memset((void *)&utmp, 0, sizeof(utmp)); 993 (void)time(&utmp.ut_time); 994 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 995 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 996 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 997 ftpd_login(&utmp); 998 } 999 1000 /* open stats file before chroot */ 1001 if (guest && (stats == 1) && (statfd < 0)) 1002 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1003 stats = 0; 1004 1005 logged_in = 1; 1006 1007 if ((dir = login_getcapstr(lc, "ftp-dir", NULL, NULL))) { 1008 char *newdir; 1009 1010 newdir = copy_dir(dir, pw); 1011 if (newdir == NULL) { 1012 perror_reply(421, "Local resource failure: malloc"); 1013 dologout(1); 1014 /* NOTREACHED */ 1015 } 1016 pw->pw_dir = newdir; 1017 pw = sgetpwnam(NULL, pw); 1018 free(dir); 1019 free(newdir); 1020 } 1021 1022 /* make sure pw->pw_dir is big enough to hold "/" */ 1023 sz_pw_dir = strlen(pw->pw_dir) + 1; 1024 if (sz_pw_dir < 2) { 1025 pw->pw_dir = "/"; 1026 pw = sgetpwnam(NULL, pw); 1027 sz_pw_dir = 2; 1028 } 1029 1030 if (guest || dochroot) { 1031 if (multihome && guest) { 1032 struct stat ts; 1033 1034 /* Compute root directory. */ 1035 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1036 pw->pw_dir, dhostname); 1037 if (stat(rootdir, &ts) < 0) { 1038 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1039 pw->pw_dir, hostname); 1040 } 1041 } else 1042 strlcpy(rootdir, pw->pw_dir, sizeof(rootdir)); 1043 } 1044 if (guest) { 1045 /* 1046 * We MUST do a chdir() after the chroot. Otherwise 1047 * the old current directory will be accessible as "." 1048 * outside the new root! 1049 */ 1050 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1051 reply(550, "Can't set guest privileges."); 1052 goto bad; 1053 } 1054 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1055 if (setenv("HOME", "/", 1) == -1) { 1056 reply(550, "Can't setup environment."); 1057 goto bad; 1058 } 1059 } else if (dochroot) { 1060 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1061 reply(550, "Can't change root."); 1062 goto bad; 1063 } 1064 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1065 if (setenv("HOME", "/", 1) == -1) { 1066 reply(550, "Can't setup environment."); 1067 goto bad; 1068 } 1069 } else if (chdir(pw->pw_dir) < 0) { 1070 if (chdir("/") < 0) { 1071 reply(530, "User %s: can't change directory to %s.", 1072 pw->pw_name, pw->pw_dir); 1073 goto bad; 1074 } else 1075 lreply(230, "No directory! Logging in with home=/"); 1076 } 1077 if (setegid(pw->pw_gid) < 0 || setgid(pw->pw_gid) < 0) { 1078 reply(550, "Can't set gid."); 1079 goto bad; 1080 } 1081 if (seteuid(pw->pw_uid) < 0 || setuid(pw->pw_uid) < 0) { 1082 reply(550, "Can't set uid."); 1083 goto bad; 1084 } 1085 sigprocmask(SIG_UNBLOCK, &allsigs, NULL); 1086 1087 /* 1088 * Set home directory so that use of ~ (tilde) works correctly. 1089 */ 1090 if (getcwd(homedir, MAXPATHLEN) != NULL) { 1091 if (setenv("HOME", homedir, 1) == -1) { 1092 reply(550, "Can't setup environment."); 1093 goto bad; 1094 } 1095 } 1096 1097 /* 1098 * Display a login message, if it exists. 1099 * N.B. reply(230,) must follow the message. 1100 */ 1101 motd = login_getcapstr(lc, "welcome", NULL, NULL); 1102 if ((fp = fopen(motd ? motd : _PATH_FTPLOGINMESG, "r")) != NULL) { 1103 char *cp, line[LINE_MAX]; 1104 1105 while (fgets(line, sizeof(line), fp) != NULL) { 1106 if ((cp = strchr(line, '\n')) != NULL) 1107 *cp = '\0'; 1108 lreply(230, "%s", line); 1109 } 1110 (void) fflush(stdout); 1111 (void) fclose(fp); 1112 } 1113 if (motd != NULL) 1114 free(motd); 1115 if (guest) { 1116 if (ident != NULL) 1117 free(ident); 1118 ident = strdup(passwd); 1119 if (ident == NULL) 1120 fatal("Ran out of memory."); 1121 reply(230, "Guest login ok, access restrictions apply."); 1122#ifdef HASSETPROCTITLE 1123 snprintf(proctitle, sizeof(proctitle), 1124 "%s: anonymous/%.*s", remotehost, 1125 (int)(sizeof(proctitle) - sizeof(remotehost) - 1126 sizeof(": anonymous/")), passwd); 1127 setproctitle("%s", proctitle); 1128#endif /* HASSETPROCTITLE */ 1129 if (logging) 1130 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1131 remotehost, passwd); 1132 } else { 1133 reply(230, "User %s logged in.", pw->pw_name); 1134#ifdef HASSETPROCTITLE 1135 snprintf(proctitle, sizeof(proctitle), 1136 "%s: %s", remotehost, pw->pw_name); 1137 setproctitle("%s", proctitle); 1138#endif /* HASSETPROCTITLE */ 1139 if (logging) 1140 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1141 remotehost, pw->pw_name); 1142 } 1143 login_close(lc); 1144 lc = NULL; 1145 return (AUTH_SLAVE); 1146bad: 1147 /* Forget all about it... */ 1148 login_close(lc); 1149 lc = NULL; 1150 end_login(); 1151 return (AUTH_FAILED); 1152} 1153 1154void 1155retrieve(char *cmd, char *name) 1156{ 1157 FILE *fin, *dout; 1158 struct stat st; 1159 int (*closefunc)(FILE *); 1160 time_t start; 1161 1162 if (cmd == 0) { 1163 fin = fopen(name, "r"), closefunc = fclose; 1164 st.st_size = 0; 1165 } else { 1166 char line[BUFSIZ]; 1167 1168 (void) snprintf(line, sizeof(line), cmd, name); 1169 name = line; 1170 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1171 st.st_size = -1; 1172 st.st_blksize = BUFSIZ; 1173 } 1174 if (fin == NULL) { 1175 if (errno != 0) { 1176 perror_reply(550, name); 1177 if (cmd == 0) { 1178 LOGCMD("get", name); 1179 } 1180 } 1181 return; 1182 } 1183 byte_count = -1; 1184 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1185 reply(550, "%s: not a plain file.", name); 1186 goto done; 1187 } 1188 if (restart_point) { 1189 if (type == TYPE_A) { 1190 off_t i, n; 1191 int c; 1192 1193 n = restart_point; 1194 i = 0; 1195 while (i++ < n) { 1196 if ((c = getc(fin)) == EOF) { 1197 if (ferror(fin)) { 1198 perror_reply(550, name); 1199 goto done; 1200 } else 1201 break; 1202 } 1203 if (c == '\n') 1204 i++; 1205 } 1206 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1207 perror_reply(550, name); 1208 goto done; 1209 } 1210 } 1211 dout = dataconn(name, st.st_size, "w"); 1212 if (dout == NULL) 1213 goto done; 1214 time(&start); 1215 send_data(fin, dout, (off_t)st.st_blksize, st.st_size, 1216 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 1217 if ((cmd == 0) && stats) 1218 logxfer(name, byte_count, start); 1219 (void) fclose(dout); 1220 data = -1; 1221done: 1222 if (pdata >= 0) 1223 (void) close(pdata); 1224 pdata = -1; 1225 if (cmd == 0) 1226 LOGBYTES("get", name, byte_count); 1227 (*closefunc)(fin); 1228} 1229 1230void 1231store(char *name, char *mode, int unique) 1232{ 1233 FILE *fout, *din; 1234 int (*closefunc)(FILE *); 1235 struct stat st; 1236 int fd; 1237 1238 if (restart_point && *mode != 'a') 1239 mode = "r+"; 1240 1241 if (unique && stat(name, &st) == 0) { 1242 char *nam; 1243 1244 fd = guniquefd(name, &nam); 1245 if (fd == -1) { 1246 LOGCMD(*mode == 'w' ? "put" : "append", name); 1247 return; 1248 } 1249 name = nam; 1250 fout = fdopen(fd, mode); 1251 } else 1252 fout = fopen(name, mode); 1253 1254 closefunc = fclose; 1255 if (fout == NULL) { 1256 perror_reply(553, name); 1257 LOGCMD(*mode == 'w' ? "put" : "append", name); 1258 return; 1259 } 1260 byte_count = -1; 1261 if (restart_point) { 1262 if (type == TYPE_A) { 1263 off_t i, n; 1264 int c; 1265 1266 n = restart_point; 1267 i = 0; 1268 while (i++ < n) { 1269 if ((c = getc(fout)) == EOF) { 1270 if (ferror(fout)) { 1271 perror_reply(550, name); 1272 goto done; 1273 } else 1274 break; 1275 } 1276 if (c == '\n') 1277 i++; 1278 } 1279 /* 1280 * We must do this seek to "current" position 1281 * because we are changing from reading to 1282 * writing. 1283 */ 1284 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1285 perror_reply(550, name); 1286 goto done; 1287 } 1288 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1289 perror_reply(550, name); 1290 goto done; 1291 } 1292 } 1293 din = dataconn(name, (off_t)-1, "r"); 1294 if (din == NULL) 1295 goto done; 1296 if (receive_data(din, fout) == 0) { 1297 if (unique) 1298 reply(226, "Transfer complete (unique file name:%s).", 1299 name); 1300 else 1301 reply(226, "Transfer complete."); 1302 } 1303 (void) fclose(din); 1304 data = -1; 1305 pdata = -1; 1306done: 1307 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1308 (*closefunc)(fout); 1309} 1310 1311static FILE * 1312getdatasock(char *mode) 1313{ 1314 int on = 1, s, t, tries; 1315 1316 if (data >= 0) 1317 return (fdopen(data, mode)); 1318 sigprocmask (SIG_BLOCK, &allsigs, NULL); 1319 s = monitor_socket(ctrl_addr.su_family); 1320 if (s < 0) 1321 goto bad; 1322 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1323 &on, sizeof(on)) < 0) 1324 goto bad; 1325 /* anchor socket to avoid multi-homing problems */ 1326 data_source = ctrl_addr; 1327 data_source.su_port = htons(20); /* ftp-data port */ 1328 for (tries = 1; ; tries++) { 1329 if (monitor_bind(s, (struct sockaddr *)&data_source, 1330 data_source.su_len) >= 0) 1331 break; 1332 if (errno != EADDRINUSE || tries > 10) 1333 goto bad; 1334 sleep((unsigned int)tries); 1335 } 1336 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1337 1338#ifdef IP_TOS 1339 if (ctrl_addr.su_family == AF_INET) { 1340 on = IPTOS_THROUGHPUT; 1341 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, 1342 sizeof(int)) < 0) 1343 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1344 } 1345#endif 1346#ifdef TCP_NOPUSH 1347 /* 1348 * Turn off push flag to keep sender TCP from sending short packets 1349 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1350 * to set the send buffer size as well, but that may not be desirable 1351 * in heavy-load situations. 1352 */ 1353 on = 1; 1354 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof(on)) < 0) 1355 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1356#endif 1357#ifdef SO_SNDBUF 1358 on = 65536; 1359 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof(on)) < 0) 1360 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1361#endif 1362 1363 return (fdopen(s, mode)); 1364bad: 1365 /* Return the real value of errno (close may change it) */ 1366 t = errno; 1367 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1368 if (s >= 0) 1369 (void) close(s); 1370 errno = t; 1371 return (NULL); 1372} 1373 1374static FILE * 1375dataconn(char *name, off_t size, char *mode) 1376{ 1377 char sizebuf[32]; 1378 FILE *file = NULL; 1379 int retry = 0; 1380 in_port_t *p; 1381 u_char *fa, *ha; 1382 size_t alen; 1383 int error; 1384 1385 file_size = size; 1386 byte_count = 0; 1387 if (size != (off_t) -1) { 1388 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1389 size); 1390 } else 1391 sizebuf[0] = '\0'; 1392 if (pdata >= 0) { 1393 union sockunion from; 1394 int s; 1395 socklen_t fromlen = sizeof(from); 1396 1397 (void) alarm ((unsigned) timeout); 1398 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1399 (void) alarm (0); 1400 if (s < 0) { 1401 reply(425, "Can't open data connection."); 1402 (void) close(pdata); 1403 pdata = -1; 1404 return (NULL); 1405 } 1406 switch (from.su_family) { 1407 case AF_INET: 1408 p = (in_port_t *)&from.su_sin.sin_port; 1409 fa = (u_char *)&from.su_sin.sin_addr; 1410 ha = (u_char *)&his_addr.su_sin.sin_addr; 1411 alen = sizeof(struct in_addr); 1412 break; 1413 case AF_INET6: 1414 p = (in_port_t *)&from.su_sin6.sin6_port; 1415 fa = (u_char *)&from.su_sin6.sin6_addr; 1416 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1417 alen = sizeof(struct in6_addr); 1418 break; 1419 default: 1420 perror_reply(425, "Can't build data connection"); 1421 (void) close(pdata); 1422 (void) close(s); 1423 pdata = -1; 1424 return (NULL); 1425 } 1426 if (from.su_family != his_addr.su_family || 1427 ntohs(*p) < IPPORT_RESERVED) { 1428 perror_reply(425, "Can't build data connection"); 1429 (void) close(pdata); 1430 (void) close(s); 1431 pdata = -1; 1432 return (NULL); 1433 } 1434 if (portcheck && memcmp(fa, ha, alen) != 0) { 1435 perror_reply(435, "Can't build data connection"); 1436 (void) close(pdata); 1437 (void) close(s); 1438 pdata = -1; 1439 return (NULL); 1440 } 1441 (void) close(pdata); 1442 pdata = s; 1443 reply(150, "Opening %s mode data connection for '%s'%s.", 1444 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1445 return (fdopen(pdata, mode)); 1446 } 1447 if (data >= 0) { 1448 reply(125, "Using existing data connection for '%s'%s.", 1449 name, sizebuf); 1450 usedefault = 1; 1451 return (fdopen(data, mode)); 1452 } 1453 if (usedefault) 1454 data_dest = his_addr; 1455 usedefault = 1; 1456 do { 1457 if (file != NULL) 1458 (void) fclose(file); 1459 file = getdatasock(mode); 1460 if (file == NULL) { 1461 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1462 1463 error = getnameinfo((struct sockaddr *)&data_source, 1464 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 1465 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV); 1466 if (error != 0) 1467 reply(425, "Can't create data socket: %s.", 1468 strerror(errno)); 1469 else 1470 reply(425, 1471 "Can't create data socket (%s,%s): %s.", 1472 hbuf, pbuf, strerror(errno)); 1473 return (NULL); 1474 } 1475 1476 /* 1477 * attempt to connect to reserved port on client machine; 1478 * this looks like an attack 1479 */ 1480 switch (data_dest.su_family) { 1481 case AF_INET: 1482 p = (in_port_t *)&data_dest.su_sin.sin_port; 1483 fa = (u_char *)&data_dest.su_sin.sin_addr; 1484 ha = (u_char *)&his_addr.su_sin.sin_addr; 1485 alen = sizeof(struct in_addr); 1486 break; 1487 case AF_INET6: 1488 p = (in_port_t *)&data_dest.su_sin6.sin6_port; 1489 fa = (u_char *)&data_dest.su_sin6.sin6_addr; 1490 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1491 alen = sizeof(struct in6_addr); 1492 break; 1493 default: 1494 perror_reply(425, "Can't build data connection"); 1495 (void) fclose(file); 1496 pdata = -1; 1497 return (NULL); 1498 } 1499 if (data_dest.su_family != his_addr.su_family || 1500 ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */ 1501 perror_reply(425, "Can't build data connection"); 1502 (void) fclose(file); 1503 return NULL; 1504 } 1505 if (portcheck && memcmp(fa, ha, alen) != 0) { 1506 perror_reply(435, "Can't build data connection"); 1507 (void) fclose(file); 1508 return NULL; 1509 } 1510 1511 if (connect(fileno(file), (struct sockaddr *)&data_dest, 1512 data_dest.su_len) == 0) { 1513 reply(150, "Opening %s mode data connection for '%s'%s.", 1514 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1515 data = fileno(file); 1516 return (file); 1517 } 1518 if (errno != EADDRINUSE) 1519 break; 1520 sleep((unsigned) swaitint); 1521 retry += swaitint; 1522 } while (retry <= swaitmax); 1523 perror_reply(425, "Can't build data connection"); 1524 (void) fclose(file); 1525 return (NULL); 1526} 1527 1528/* 1529 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1530 * encapsulation of the data subject to Mode, Structure, and Type. 1531 * 1532 * NB: Form isn't handled. 1533 */ 1534static int 1535send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1536{ 1537 int c, cnt, filefd, netfd; 1538 char *buf, *bp; 1539 size_t len; 1540 1541 transflag++; 1542 switch (type) { 1543 1544 case TYPE_A: 1545 while ((c = getc(instr)) != EOF) { 1546 if (recvurg) 1547 goto got_oob; 1548 byte_count++; 1549 if (c == '\n') { 1550 if (ferror(outstr)) 1551 goto data_err; 1552 (void) putc('\r', outstr); 1553 } 1554 (void) putc(c, outstr); 1555 } 1556 fflush(outstr); 1557 transflag = 0; 1558 if (ferror(instr)) 1559 goto file_err; 1560 if (ferror(outstr)) 1561 goto data_err; 1562 reply(226, "Transfer complete."); 1563 return(0); 1564 1565 case TYPE_I: 1566 case TYPE_L: 1567 /* 1568 * isreg is only set if we are not doing restart and we 1569 * are sending a regular file 1570 */ 1571 netfd = fileno(outstr); 1572 filefd = fileno(instr); 1573 1574 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1575 size_t fsize = (size_t)filesize; 1576 1577 buf = mmap(0, fsize, PROT_READ, MAP_SHARED, filefd, 1578 (off_t)0); 1579 if (buf == MAP_FAILED) { 1580 syslog(LOG_WARNING, "mmap(%llu): %m", 1581 (unsigned long long)fsize); 1582 goto oldway; 1583 } 1584 bp = buf; 1585 len = fsize; 1586 do { 1587 cnt = write(netfd, bp, len); 1588 if (recvurg) { 1589 munmap(buf, fsize); 1590 goto got_oob; 1591 } 1592 len -= cnt; 1593 bp += cnt; 1594 if (cnt > 0) 1595 byte_count += cnt; 1596 } while(cnt > 0 && len > 0); 1597 1598 transflag = 0; 1599 munmap(buf, fsize); 1600 if (cnt < 0) 1601 goto data_err; 1602 reply(226, "Transfer complete."); 1603 return(0); 1604 } 1605 1606oldway: 1607 if ((buf = malloc((size_t)blksize)) == NULL) { 1608 transflag = 0; 1609 perror_reply(451, "Local resource failure: malloc"); 1610 return(-1); 1611 } 1612 1613 while ((cnt = read(filefd, buf, (size_t)blksize)) > 0 && 1614 write(netfd, buf, cnt) == cnt) 1615 byte_count += cnt; 1616 transflag = 0; 1617 (void)free(buf); 1618 if (cnt != 0) { 1619 if (cnt < 0) 1620 goto file_err; 1621 goto data_err; 1622 } 1623 reply(226, "Transfer complete."); 1624 return(0); 1625 default: 1626 transflag = 0; 1627 reply(550, "Unimplemented TYPE %d in send_data", type); 1628 return(-1); 1629 } 1630 1631data_err: 1632 transflag = 0; 1633 perror_reply(426, "Data connection"); 1634 return(-1); 1635 1636file_err: 1637 transflag = 0; 1638 perror_reply(551, "Error on input file"); 1639 return(-1); 1640 1641got_oob: 1642 myoob(); 1643 recvurg = 0; 1644 transflag = 0; 1645 return(-1); 1646} 1647 1648/* 1649 * Transfer data from peer to "outstr" using the appropriate encapulation of 1650 * the data subject to Mode, Structure, and Type. 1651 * 1652 * N.B.: Form isn't handled. 1653 */ 1654static int 1655receive_data(FILE *instr, FILE *outstr) 1656{ 1657 int c; 1658 int cnt; 1659 char buf[BUFSIZ]; 1660 struct sigaction sa, sa_saved; 1661 volatile int bare_lfs = 0; 1662 1663 transflag++; 1664 switch (type) { 1665 1666 case TYPE_I: 1667 case TYPE_L: 1668 memset(&sa, 0, sizeof(sa)); 1669 sigfillset(&sa.sa_mask); 1670 sa.sa_flags = SA_RESTART; 1671 sa.sa_handler = lostconn; 1672 (void) sigaction(SIGALRM, &sa, &sa_saved); 1673 do { 1674 (void) alarm ((unsigned) timeout); 1675 cnt = read(fileno(instr), buf, sizeof(buf)); 1676 (void) alarm (0); 1677 if (recvurg) 1678 goto got_oob; 1679 1680 if (cnt > 0) { 1681 if (write(fileno(outstr), buf, cnt) != cnt) 1682 goto file_err; 1683 byte_count += cnt; 1684 } 1685 } while (cnt > 0); 1686 (void) sigaction(SIGALRM, &sa_saved, NULL); 1687 if (cnt < 0) 1688 goto data_err; 1689 transflag = 0; 1690 return (0); 1691 1692 case TYPE_E: 1693 reply(553, "TYPE E not implemented."); 1694 transflag = 0; 1695 return (-1); 1696 1697 case TYPE_A: 1698 while ((c = getc(instr)) != EOF) { 1699 if (recvurg) 1700 goto got_oob; 1701 byte_count++; 1702 if (c == '\n') 1703 bare_lfs++; 1704 while (c == '\r') { 1705 if (ferror(outstr)) 1706 goto data_err; 1707 if ((c = getc(instr)) != '\n') { 1708 (void) putc ('\r', outstr); 1709 if (c == '\0' || c == EOF) 1710 goto contin2; 1711 } 1712 } 1713 (void) putc(c, outstr); 1714 contin2: ; 1715 } 1716 fflush(outstr); 1717 if (ferror(instr)) 1718 goto data_err; 1719 if (ferror(outstr)) 1720 goto file_err; 1721 transflag = 0; 1722 if (bare_lfs) { 1723 lreply(226, 1724 "WARNING! %d bare linefeeds received in ASCII mode", 1725 bare_lfs); 1726 printf(" File may not have transferred correctly.\r\n"); 1727 } 1728 return (0); 1729 default: 1730 reply(550, "Unimplemented TYPE %d in receive_data", type); 1731 transflag = 0; 1732 return (-1); 1733 } 1734 1735data_err: 1736 transflag = 0; 1737 perror_reply(426, "Data Connection"); 1738 return (-1); 1739 1740file_err: 1741 transflag = 0; 1742 perror_reply(452, "Error writing file"); 1743 return (-1); 1744 1745got_oob: 1746 myoob(); 1747 recvurg = 0; 1748 transflag = 0; 1749 return (-1); 1750} 1751 1752void 1753statfilecmd(char *filename) 1754{ 1755 FILE *fin; 1756 int c; 1757 int atstart; 1758 char line[LINE_MAX]; 1759 1760 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1761 fin = ftpd_popen(line, "r"); 1762 lreply(211, "status of %s:", filename); 1763 atstart = 1; 1764 while ((c = getc(fin)) != EOF) { 1765 if (c == '\n') { 1766 if (ferror(stdout)){ 1767 perror_reply(421, "control connection"); 1768 (void) ftpd_pclose(fin); 1769 dologout(1); 1770 /* NOTREACHED */ 1771 } 1772 if (ferror(fin)) { 1773 perror_reply(551, filename); 1774 (void) ftpd_pclose(fin); 1775 return; 1776 } 1777 (void) putc('\r', stdout); 1778 } 1779 if (atstart && isdigit(c)) 1780 (void) putc(' ', stdout); 1781 (void) putc(c, stdout); 1782 atstart = (c == '\n'); 1783 } 1784 (void) ftpd_pclose(fin); 1785 reply(211, "End of Status"); 1786} 1787 1788void 1789statcmd(void) 1790{ 1791 union sockunion *su; 1792 u_char *a, *p; 1793 char hbuf[MAXHOSTNAMELEN]; 1794 int ispassive; 1795 int error; 1796 1797 lreply(211, "%s FTP server status:", hostname); 1798 printf(" %s\r\n", version); 1799 error = getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1800 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST); 1801 printf(" Connected to %s", remotehost); 1802 if (error == 0 && strcmp(remotehost, hbuf) != 0) 1803 printf(" (%s)", hbuf); 1804 printf("\r\n"); 1805 if (logged_in) { 1806 if (guest) 1807 printf(" Logged in anonymously\r\n"); 1808 else 1809 printf(" Logged in as %s\r\n", pw->pw_name); 1810 } else if (askpasswd) 1811 printf(" Waiting for password\r\n"); 1812 else 1813 printf(" Waiting for user name\r\n"); 1814 printf(" TYPE: %s", typenames[type]); 1815 if (type == TYPE_A || type == TYPE_E) 1816 printf(", FORM: %s", formnames[form]); 1817 if (type == TYPE_L) 1818#if NBBY == 8 1819 printf(" %d", NBBY); 1820#else 1821 printf(" %d", bytesize); /* need definition! */ 1822#endif 1823 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1824 strunames[stru], modenames[mode]); 1825 ispassive = 0; 1826 if (data != -1) 1827 printf(" Data connection open\r\n"); 1828 else if (pdata != -1) { 1829 printf(" in Passive mode\r\n"); 1830 su = (union sockunion *)&pasv_addr; 1831 ispassive++; 1832 goto printaddr; 1833 } else if (usedefault == 0) { 1834 size_t alen; 1835 int af, i; 1836 1837 su = (union sockunion *)&data_dest; 1838printaddr: 1839 /* PASV/PORT */ 1840 if (su->su_family == AF_INET) { 1841 if (ispassive) 1842 printf("211- PASV "); 1843 else 1844 printf("211- PORT "); 1845 a = (u_char *)&su->su_sin.sin_addr; 1846 p = (u_char *)&su->su_sin.sin_port; 1847 printf("(%u,%u,%u,%u,%u,%u)\r\n", 1848 a[0], a[1], a[2], a[3], 1849 p[0], p[1]); 1850 } 1851 1852 /* LPSV/LPRT */ 1853 alen = 0; 1854 switch (su->su_family) { 1855 case AF_INET: 1856 a = (u_char *)&su->su_sin.sin_addr; 1857 p = (u_char *)&su->su_sin.sin_port; 1858 alen = sizeof(su->su_sin.sin_addr); 1859 af = 4; 1860 break; 1861 case AF_INET6: 1862 a = (u_char *)&su->su_sin6.sin6_addr; 1863 p = (u_char *)&su->su_sin6.sin6_port; 1864 alen = sizeof(su->su_sin6.sin6_addr); 1865 af = 6; 1866 break; 1867 default: 1868 af = 0; 1869 break; 1870 } 1871 if (af) { 1872 if (ispassive) 1873 printf("211- LPSV "); 1874 else 1875 printf("211- LPRT "); 1876 printf("(%u,%llu", af, (unsigned long long)alen); 1877 for (i = 0; i < alen; i++) 1878 printf(",%u", a[i]); 1879 printf(",%u,%u,%u)\r\n", 2, p[0], p[1]); 1880 } 1881 1882 /* EPRT/EPSV */ 1883 switch (su->su_family) { 1884 case AF_INET: 1885 af = 1; 1886 break; 1887 case AF_INET6: 1888 af = 2; 1889 break; 1890 default: 1891 af = 0; 1892 break; 1893 } 1894 if (af) { 1895 char pbuf[10]; 1896 union sockunion tmp = *su; 1897 1898 if (tmp.su_family == AF_INET6) 1899 tmp.su_sin6.sin6_scope_id = 0; 1900 if (getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 1901 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1902 NI_NUMERICHOST | NI_NUMERICSERV) == 0) { 1903 if (ispassive) 1904 printf("211- EPSV "); 1905 else 1906 printf("211- EPRT "); 1907 printf("(|%u|%s|%s|)\r\n", 1908 af, hbuf, pbuf); 1909 } 1910 } 1911 } else 1912 printf(" No data connection\r\n"); 1913 reply(211, "End of status"); 1914} 1915 1916void 1917fatal(char *s) 1918{ 1919 1920 reply(451, "Error in server: %s", s); 1921 reply(221, "Closing connection due to server error."); 1922 dologout(0); 1923 /* NOTREACHED */ 1924} 1925 1926void 1927reply(int n, const char *fmt, ...) 1928{ 1929 char *buf, *p, *next; 1930 int rval; 1931 va_list ap; 1932 1933 va_start(ap, fmt); 1934 rval = vasprintf(&buf, fmt, ap); 1935 va_end(ap); 1936 if (rval == -1 || buf == NULL) { 1937 printf("412 Local resource failure: malloc\r\n"); 1938 fflush(stdout); 1939 dologout(1); 1940 } 1941 next = buf; 1942 while ((p = strsep(&next, "\n\r"))) { 1943 printf("%d%s %s\r\n", n, (next != '\0') ? "-" : "", p); 1944 if (debug) 1945 syslog(LOG_DEBUG, "<--- %d%s %s", n, 1946 (next != '\0') ? "-" : "", p); 1947 } 1948 (void)fflush(stdout); 1949 free(buf); 1950} 1951 1952 1953void 1954reply_r(int n, const char *fmt, ...) 1955{ 1956 char *p, *next; 1957 char msg[BUFSIZ]; 1958 char buf[BUFSIZ]; 1959 va_list ap; 1960 struct syslog_data sdata = SYSLOG_DATA_INIT; 1961 1962 va_start(ap, fmt); 1963 vsnprintf(msg, sizeof(msg), fmt, ap); 1964 va_end(ap); 1965 1966 next = msg; 1967 1968 while ((p = strsep(&next, "\n\r"))) { 1969 snprintf(buf, sizeof(buf), "%d%s %s\r\n", n, 1970 (next != '\0') ? "-" : "", p); 1971 write(STDOUT_FILENO, buf, strlen(buf)); 1972 if (debug) { 1973 buf[strlen(buf) - 2] = '\0'; 1974 syslog_r(LOG_DEBUG, &sdata, "<--- %s", buf); 1975 } 1976 } 1977} 1978 1979void 1980lreply(int n, const char *fmt, ...) 1981{ 1982 va_list ap; 1983 1984 va_start(ap, fmt); 1985 (void)printf("%d- ", n); 1986 (void)vprintf(fmt, ap); 1987 va_end(ap); 1988 (void)printf("\r\n"); 1989 (void)fflush(stdout); 1990 if (debug) { 1991 va_start(ap, fmt); 1992 syslog(LOG_DEBUG, "<--- %d- ", n); 1993 vsyslog(LOG_DEBUG, fmt, ap); 1994 va_end(ap); 1995 } 1996} 1997 1998static void 1999ack(char *s) 2000{ 2001 2002 reply(250, "%s command successful.", s); 2003} 2004 2005void 2006nack(char *s) 2007{ 2008 2009 reply(502, "%s command not implemented.", s); 2010} 2011 2012/* ARGSUSED */ 2013void 2014yyerror(char *s) 2015{ 2016 char *cp; 2017 2018 if ((cp = strchr(cbuf,'\n'))) 2019 *cp = '\0'; 2020 reply(500, "'%s': command not understood.", cbuf); 2021} 2022 2023void 2024delete(char *name) 2025{ 2026 struct stat st; 2027 2028 LOGCMD("delete", name); 2029 if (stat(name, &st) < 0) { 2030 perror_reply(550, name); 2031 return; 2032 } 2033 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2034 if (rmdir(name) < 0) { 2035 perror_reply(550, name); 2036 return; 2037 } 2038 goto done; 2039 } 2040 if (unlink(name) < 0) { 2041 perror_reply(550, name); 2042 return; 2043 } 2044done: 2045 ack("DELE"); 2046} 2047 2048void 2049cwd(char *path) 2050{ 2051 FILE *message; 2052 2053 if (chdir(path) < 0) 2054 perror_reply(550, path); 2055 else { 2056 if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) { 2057 char *cp, line[LINE_MAX]; 2058 2059 while (fgets(line, sizeof(line), message) != NULL) { 2060 if ((cp = strchr(line, '\n')) != NULL) 2061 *cp = '\0'; 2062 lreply(250, "%s", line); 2063 } 2064 (void) fflush(stdout); 2065 (void) fclose(message); 2066 } 2067 ack("CWD"); 2068 } 2069} 2070 2071void 2072replydirname(const char *name, const char *message) 2073{ 2074 char *p, *ep; 2075 char npath[MAXPATHLEN * 2]; 2076 2077 p = npath; 2078 ep = &npath[sizeof(npath) - 1]; 2079 while (*name) { 2080 if (*name == '"') { 2081 if (ep - p < 2) 2082 break; 2083 *p++ = *name++; 2084 *p++ = '"'; 2085 } else { 2086 if (ep - p < 1) 2087 break; 2088 *p++ = *name++; 2089 } 2090 } 2091 *p = '\0'; 2092 reply(257, "\"%s\" %s", npath, message); 2093} 2094 2095void 2096makedir(char *name) 2097{ 2098 2099 LOGCMD("mkdir", name); 2100 if (mkdir(name, 0777) < 0) 2101 perror_reply(550, name); 2102 else 2103 replydirname(name, "directory created."); 2104} 2105 2106void 2107removedir(char *name) 2108{ 2109 2110 LOGCMD("rmdir", name); 2111 if (rmdir(name) < 0) 2112 perror_reply(550, name); 2113 else 2114 ack("RMD"); 2115} 2116 2117void 2118pwd(void) 2119{ 2120 char path[MAXPATHLEN]; 2121 2122 if (getcwd(path, sizeof(path)) == NULL) 2123 perror_reply(550, "Can't get current directory"); 2124 else 2125 replydirname(path, "is current directory."); 2126} 2127 2128char * 2129renamefrom(char *name) 2130{ 2131 struct stat st; 2132 2133 if (stat(name, &st) < 0) { 2134 perror_reply(550, name); 2135 return ((char *)0); 2136 } 2137 reply(350, "File exists, ready for destination name"); 2138 return (name); 2139} 2140 2141void 2142renamecmd(char *from, char *to) 2143{ 2144 2145 LOGCMD2("rename", from, to); 2146 if (rename(from, to) < 0) 2147 perror_reply(550, "rename"); 2148 else 2149 ack("RNTO"); 2150} 2151 2152static void 2153dolog(struct sockaddr *sa) 2154{ 2155 char hbuf[sizeof(remotehost)]; 2156 2157 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0) == 0) 2158 (void) strlcpy(remotehost, hbuf, sizeof(remotehost)); 2159 else 2160 (void) strlcpy(remotehost, "unknown", sizeof(remotehost)); 2161 2162#ifdef HASSETPROCTITLE 2163 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2164 setproctitle("%s", proctitle); 2165#endif /* HASSETPROCTITLE */ 2166 2167 if (logging) 2168 syslog(LOG_INFO, "connection from %s", remotehost); 2169} 2170 2171/* 2172 * Record logout in wtmp file and exit with supplied status. 2173 * NOTE: because this is called from signal handlers it cannot 2174 * use stdio (or call other functions that use stdio). 2175 */ 2176void 2177dologout(int status) 2178{ 2179 2180 transflag = 0; 2181 2182 if (logged_in) { 2183 sigprocmask(SIG_BLOCK, &allsigs, NULL); 2184 ftpdlogwtmp(ttyline, "", ""); 2185 if (doutmp) 2186 ftpd_logout(utmp.ut_line); 2187 } 2188 /* beware of flushing buffers after a SIGPIPE */ 2189 _exit(status); 2190} 2191 2192/*ARGSUSED*/ 2193static void 2194sigurg(int signo) 2195{ 2196 2197 recvurg = 1; 2198} 2199 2200static void 2201myoob(void) 2202{ 2203 char *cp; 2204 2205 /* only process if transfer occurring */ 2206 if (!transflag) 2207 return; 2208 cp = tmpline; 2209 if (getline(cp, 7, stdin) == NULL) { 2210 reply(221, "You could at least say goodbye."); 2211 dologout(0); 2212 } 2213 upper(cp); 2214 if (strcmp(cp, "ABOR\r\n") == 0) { 2215 tmpline[0] = '\0'; 2216 reply(426, "Transfer aborted. Data connection closed."); 2217 reply(226, "Abort successful"); 2218 } 2219 if (strcmp(cp, "STAT\r\n") == 0) { 2220 tmpline[0] = '\0'; 2221 if (file_size != (off_t) -1) 2222 reply(213, "Status: %qd of %qd bytes transferred", 2223 byte_count, file_size); 2224 else 2225 reply(213, "Status: %qd bytes transferred", byte_count); 2226 } 2227} 2228 2229/* 2230 * Note: a response of 425 is not mentioned as a possible response to 2231 * the PASV command in RFC959. However, it has been blessed as 2232 * a legitimate response by Jon Postel in a telephone conversation 2233 * with Rick Adams on 25 Jan 89. 2234 */ 2235void 2236passive(void) 2237{ 2238 socklen_t len; 2239 int on; 2240 u_char *p, *a; 2241 2242 if (pw == NULL) { 2243 reply(530, "Please login with USER and PASS"); 2244 return; 2245 } 2246 if (pdata >= 0) 2247 close(pdata); 2248 /* 2249 * XXX 2250 * At this point, it would be nice to have an algorithm that 2251 * inserted a growing delay in an attack scenario. Such a thing 2252 * would look like continual passive sockets being opened, but 2253 * nothing serious being done with them. They're not used to 2254 * move data; the entire attempt is just to use tcp FIN_WAIT 2255 * resources. 2256 */ 2257 pdata = socket(AF_INET, SOCK_STREAM, 0); 2258 if (pdata < 0) { 2259 perror_reply(425, "Can't open passive connection"); 2260 return; 2261 } 2262 2263 on = IP_PORTRANGE_HIGH; 2264 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2265 &on, sizeof(on)) < 0) 2266 goto pasv_error; 2267 2268 pasv_addr = ctrl_addr; 2269 pasv_addr.su_sin.sin_port = 0; 2270 if (bind(pdata, (struct sockaddr *)&pasv_addr, 2271 pasv_addr.su_len) < 0) 2272 goto pasv_error; 2273 2274 len = sizeof(pasv_addr); 2275 if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) < 0) 2276 goto pasv_error; 2277 if (listen(pdata, 1) < 0) 2278 goto pasv_error; 2279 a = (u_char *)&pasv_addr.su_sin.sin_addr; 2280 p = (u_char *)&pasv_addr.su_sin.sin_port; 2281 2282 reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0], 2283 a[1], a[2], a[3], p[0], p[1]); 2284 return; 2285 2286pasv_error: 2287 (void) close(pdata); 2288 pdata = -1; 2289 perror_reply(425, "Can't open passive connection"); 2290 return; 2291} 2292 2293int 2294epsvproto2af(int proto) 2295{ 2296 2297 switch (proto) { 2298 case 1: return AF_INET; 2299#ifdef INET6 2300 case 2: return AF_INET6; 2301#endif 2302 default: return -1; 2303 } 2304} 2305 2306int 2307af2epsvproto(int af) 2308{ 2309 2310 switch (af) { 2311 case AF_INET: return 1; 2312#ifdef INET6 2313 case AF_INET6: return 2; 2314#endif 2315 default: return -1; 2316 } 2317} 2318 2319/* 2320 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2321 * 229 Entering Extended Passive Mode (|||port|) 2322 */ 2323void 2324long_passive(char *cmd, int pf) 2325{ 2326 socklen_t len; 2327 int on; 2328 u_char *p, *a; 2329 2330 if (!logged_in) { 2331 syslog(LOG_NOTICE, "long passive but not logged in"); 2332 reply(503, "Login with USER first."); 2333 return; 2334 } 2335 2336 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2337 /* 2338 * XXX 2339 * only EPRT/EPSV ready clients will understand this 2340 */ 2341 if (strcmp(cmd, "EPSV") != 0) 2342 reply(501, "Network protocol mismatch"); /*XXX*/ 2343 else 2344 epsv_protounsupp("Network protocol mismatch"); 2345 2346 return; 2347 } 2348 2349 if (pdata >= 0) 2350 close(pdata); 2351 /* 2352 * XXX 2353 * At this point, it would be nice to have an algorithm that 2354 * inserted a growing delay in an attack scenario. Such a thing 2355 * would look like continual passive sockets being opened, but 2356 * nothing serious being done with them. They not used to move 2357 * data; the entire attempt is just to use tcp FIN_WAIT 2358 * resources. 2359 */ 2360 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2361 if (pdata < 0) { 2362 perror_reply(425, "Can't open passive connection"); 2363 return; 2364 } 2365 2366 switch (ctrl_addr.su_family) { 2367 case AF_INET: 2368 on = IP_PORTRANGE_HIGH; 2369 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2370 &on, sizeof(on)) < 0) 2371 goto pasv_error; 2372 break; 2373 case AF_INET6: 2374 on = IPV6_PORTRANGE_HIGH; 2375 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2376 &on, sizeof(on)) < 0) 2377 goto pasv_error; 2378 break; 2379 } 2380 2381 pasv_addr = ctrl_addr; 2382 pasv_addr.su_port = 0; 2383 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2384 goto pasv_error; 2385 len = pasv_addr.su_len; 2386 if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) < 0) 2387 goto pasv_error; 2388 if (listen(pdata, 1) < 0) 2389 goto pasv_error; 2390 p = (u_char *)&pasv_addr.su_port; 2391 2392 if (strcmp(cmd, "LPSV") == 0) { 2393 switch (pasv_addr.su_family) { 2394 case AF_INET: 2395 a = (u_char *)&pasv_addr.su_sin.sin_addr; 2396 reply(228, 2397 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2398 4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]); 2399 return; 2400 case AF_INET6: 2401 a = (u_char *)&pasv_addr.su_sin6.sin6_addr; 2402 reply(228, 2403 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u," 2404 "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2405 6, 16, a[0], a[1], a[2], a[3], a[4], 2406 a[5], a[6], a[7], a[8], a[9], a[10], 2407 a[11], a[12], a[13], a[14], a[15], 2408 2, p[0], p[1]); 2409 return; 2410 } 2411 } else if (strcmp(cmd, "EPSV") == 0) { 2412 switch (pasv_addr.su_family) { 2413 case AF_INET: 2414 case AF_INET6: 2415 reply(229, "Entering Extended Passive Mode (|||%u|)", 2416 ntohs(pasv_addr.su_port)); 2417 return; 2418 } 2419 } else { 2420 /* more proper error code? */ 2421 } 2422 2423 pasv_error: 2424 (void) close(pdata); 2425 pdata = -1; 2426 perror_reply(425, "Can't open passive connection"); 2427 return; 2428} 2429 2430/* 2431 * EPRT |proto|addr|port| 2432 */ 2433int 2434extended_port(const char *arg) 2435{ 2436 char *tmp = NULL; 2437 char *result[3]; 2438 char *p, *q; 2439 char delim; 2440 struct addrinfo hints; 2441 struct addrinfo *res = NULL; 2442 int i; 2443 unsigned long proto; 2444 2445 if (epsvall) { 2446 reply(501, "EPRT disallowed after EPSV ALL"); 2447 return -1; 2448 } 2449 2450 usedefault = 0; 2451 if (pdata >= 0) { 2452 (void) close(pdata); 2453 pdata = -1; 2454 } 2455 2456 tmp = strdup(arg); 2457 if (!tmp) { 2458 fatal("not enough core."); 2459 /*NOTREACHED*/ 2460 } 2461 p = tmp; 2462 delim = p[0]; 2463 p++; 2464 memset(result, 0, sizeof(result)); 2465 for (i = 0; i < 3; i++) { 2466 q = strchr(p, delim); 2467 if (!q || *q != delim) 2468 goto parsefail; 2469 *q++ = '\0'; 2470 result[i] = p; 2471 p = q; 2472 } 2473 2474 /* some more sanity check */ 2475 p = NULL; 2476 (void)strtoul(result[2], &p, 10); 2477 if (!*result[2] || *p) 2478 goto protounsupp; 2479 p = NULL; 2480 proto = strtoul(result[0], &p, 10); 2481 if (!*result[0] || *p) 2482 goto protounsupp; 2483 2484 memset(&hints, 0, sizeof(hints)); 2485 hints.ai_family = epsvproto2af((int)proto); 2486 if (hints.ai_family < 0) 2487 goto protounsupp; 2488 hints.ai_socktype = SOCK_STREAM; 2489 hints.ai_flags = AI_NUMERICHOST; /*no DNS*/ 2490 if (getaddrinfo(result[1], result[2], &hints, &res)) 2491 goto parsefail; 2492 if (res->ai_next) 2493 goto parsefail; 2494 if (sizeof(data_dest) < res->ai_addrlen) 2495 goto parsefail; 2496 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2497 if (his_addr.su_family == AF_INET6 && 2498 data_dest.su_family == AF_INET6) { 2499 /* XXX more sanity checks! */ 2500 data_dest.su_sin6.sin6_scope_id = 2501 his_addr.su_sin6.sin6_scope_id; 2502 } 2503 if (pdata >= 0) { 2504 (void) close(pdata); 2505 pdata = -1; 2506 } 2507 reply(200, "EPRT command successful."); 2508 2509 if (tmp) 2510 free(tmp); 2511 if (res) 2512 freeaddrinfo(res); 2513 return 0; 2514 2515parsefail: 2516 reply(500, "Invalid argument, rejected."); 2517 usedefault = 1; 2518 if (tmp) 2519 free(tmp); 2520 if (res) 2521 freeaddrinfo(res); 2522 return -1; 2523 2524protounsupp: 2525 epsv_protounsupp("Protocol not supported"); 2526 usedefault = 1; 2527 if (tmp) 2528 free(tmp); 2529 if (res) 2530 freeaddrinfo(res); 2531 return -1; 2532} 2533 2534/* 2535 * 522 Protocol not supported (proto,...) 2536 * as we assume address family for control and data connections are the same, 2537 * we do not return the list of address families we support - instead, we 2538 * return the address family of the control connection. 2539 */ 2540void 2541epsv_protounsupp(const char *message) 2542{ 2543 int proto; 2544 2545 proto = af2epsvproto(ctrl_addr.su_family); 2546 if (proto < 0) 2547 reply(501, "%s", message); /*XXX*/ 2548 else 2549 reply(522, "%s, use (%d)", message, proto); 2550} 2551 2552/* 2553 * Generate unique name for file with basename "local". 2554 * The file named "local" is already known to exist. 2555 * Generates failure reply on error. 2556 */ 2557static int 2558guniquefd(char *local, char **nam) 2559{ 2560 static char new[MAXPATHLEN]; 2561 struct stat st; 2562 int count, len, fd; 2563 char *cp; 2564 2565 cp = strrchr(local, '/'); 2566 if (cp) 2567 *cp = '\0'; 2568 if (stat(cp ? local : ".", &st) < 0) { 2569 perror_reply(553, cp ? local : "."); 2570 return (-1); 2571 } 2572 if (cp) 2573 *cp = '/'; 2574 len = strlcpy(new, local, sizeof(new)); 2575 if (len+2+1 >= sizeof(new)-1) 2576 return (-1); 2577 cp = new + len; 2578 *cp++ = '.'; 2579 for (count = 1; count < 100; count++) { 2580 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 2581 fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666); 2582 if (fd == -1) 2583 continue; 2584 if (nam) 2585 *nam = new; 2586 return (fd); 2587 } 2588 reply(452, "Unique file name cannot be created."); 2589 return (-1); 2590} 2591 2592/* 2593 * Format and send reply containing system error number. 2594 */ 2595void 2596perror_reply(int code, char *string) 2597{ 2598 2599 reply(code, "%s: %s.", string, strerror(errno)); 2600} 2601 2602static char *onefile[] = { 2603 "", 2604 0 2605}; 2606 2607void 2608send_file_list(char *whichf) 2609{ 2610 struct stat st; 2611 DIR *dirp = NULL; 2612 struct dirent *dir; 2613 FILE *dout = NULL; 2614 char **dirlist; 2615 char *dirname; 2616 int simple = 0; 2617 volatile int freeglob = 0; 2618 glob_t gl; 2619 2620 if (strpbrk(whichf, "~{[*?") != NULL) { 2621 memset(&gl, 0, sizeof(gl)); 2622 freeglob = 1; 2623 if (glob(whichf, 2624 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, 2625 0, &gl)) { 2626 reply(550, "not found"); 2627 goto out; 2628 } else if (gl.gl_pathc == 0) { 2629 errno = ENOENT; 2630 perror_reply(550, whichf); 2631 goto out; 2632 } 2633 dirlist = gl.gl_pathv; 2634 } else { 2635 onefile[0] = whichf; 2636 dirlist = onefile; 2637 simple = 1; 2638 } 2639 2640 while ((dirname = *dirlist++)) { 2641 if (stat(dirname, &st) < 0) { 2642 /* 2643 * If user typed "ls -l", etc, and the client 2644 * used NLST, do what the user meant. 2645 */ 2646 if (dirname[0] == '-' && *dirlist == NULL && 2647 transflag == 0) { 2648 retrieve("/bin/ls %s", dirname); 2649 goto out; 2650 } 2651 perror_reply(550, whichf); 2652 if (dout != NULL) { 2653 (void) fclose(dout); 2654 transflag = 0; 2655 data = -1; 2656 pdata = -1; 2657 } 2658 goto out; 2659 } 2660 2661 if (S_ISREG(st.st_mode)) { 2662 if (dout == NULL) { 2663 dout = dataconn("file list", (off_t)-1, "w"); 2664 if (dout == NULL) 2665 goto out; 2666 transflag++; 2667 } 2668 fprintf(dout, "%s%s\n", dirname, 2669 type == TYPE_A ? "\r" : ""); 2670 byte_count += strlen(dirname) + 1; 2671 continue; 2672 } else if (!S_ISDIR(st.st_mode)) 2673 continue; 2674 2675 if ((dirp = opendir(dirname)) == NULL) 2676 continue; 2677 2678 while ((dir = readdir(dirp)) != NULL) { 2679 char nbuf[MAXPATHLEN]; 2680 2681 if (recvurg) { 2682 myoob(); 2683 recvurg = 0; 2684 transflag = 0; 2685 goto out; 2686 } 2687 2688 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2689 continue; 2690 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2691 dir->d_namlen == 2) 2692 continue; 2693 2694 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 2695 dir->d_name); 2696 2697 /* 2698 * We have to do a stat to insure it's 2699 * not a directory or special file. 2700 */ 2701 if (simple || (stat(nbuf, &st) == 0 && 2702 S_ISREG(st.st_mode))) { 2703 if (dout == NULL) { 2704 dout = dataconn("file list", (off_t)-1, 2705 "w"); 2706 if (dout == NULL) 2707 goto out; 2708 transflag++; 2709 } 2710 if (nbuf[0] == '.' && nbuf[1] == '/') 2711 fprintf(dout, "%s%s\n", &nbuf[2], 2712 type == TYPE_A ? "\r" : ""); 2713 else 2714 fprintf(dout, "%s%s\n", nbuf, 2715 type == TYPE_A ? "\r" : ""); 2716 byte_count += strlen(nbuf) + 1; 2717 } 2718 } 2719 (void) closedir(dirp); 2720 } 2721 2722 if (dout == NULL) 2723 reply(550, "No files found."); 2724 else if (ferror(dout) != 0) 2725 perror_reply(550, "Data connection"); 2726 else 2727 reply(226, "Transfer complete."); 2728 2729 transflag = 0; 2730 if (dout != NULL) 2731 (void) fclose(dout); 2732 else { 2733 if (pdata >= 0) 2734 close(pdata); 2735 } 2736 data = -1; 2737 pdata = -1; 2738out: 2739 if (freeglob) { 2740 freeglob = 0; 2741 globfree(&gl); 2742 } 2743} 2744 2745/*ARGSUSED*/ 2746static void 2747reapchild(int signo) 2748{ 2749 int save_errno = errno; 2750 int rval; 2751 2752 do { 2753 rval = waitpid(-1, NULL, WNOHANG); 2754 } while (rval > 0 || (rval == -1 && errno == EINTR)); 2755 errno = save_errno; 2756} 2757 2758void 2759logxfer(char *name, off_t size, time_t start) 2760{ 2761 char buf[400 + MAXHOSTNAMELEN*4 + MAXPATHLEN*4]; 2762 char dir[MAXPATHLEN], path[MAXPATHLEN], rpath[MAXPATHLEN]; 2763 char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; 2764 char *vpw; 2765 time_t now; 2766 int len; 2767 2768 if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) { 2769 time(&now); 2770 2771 vpw = malloc(strlen(guest ? guestpw : pw->pw_name) * 4 + 1); 2772 if (vpw == NULL) 2773 return; 2774 2775 snprintf(path, sizeof(path), "%s/%s", dir, name); 2776 if (realpath(path, rpath) == NULL) 2777 strlcpy(rpath, path, sizeof(rpath)); 2778 strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH); 2779 2780 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2781 strvis(vpw, guest? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2782 2783 len = snprintf(buf, sizeof(buf), 2784 "%.24s %d %s %qd %s %c %s %c %c %s ftp %d %s %s\n", 2785 ctime(&now), now - start + (now == start), 2786 vremotehost, (long long)size, vpath, 2787 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2788 'o', ((guest) ? 'a' : 'r'), 2789 vpw, 0 /* none yet */, 2790 ((guest) ? "*" : pw->pw_name), dhostname); 2791 2792 if (len >= sizeof(buf) || len == -1) { 2793 if ((len = strlen(buf)) == 0) 2794 return; /* should not happen */ 2795 buf[len - 1] = '\n'; 2796 } 2797 write(statfd, buf, len); 2798 free(vpw); 2799 } 2800} 2801 2802void 2803set_slave_signals(void) 2804{ 2805 struct sigaction sa; 2806 2807 sigemptyset(&sa.sa_mask); 2808 sa.sa_flags = SA_RESTART; 2809 2810 sa.sa_handler = SIG_DFL; 2811 (void) sigaction(SIGCHLD, &sa, NULL); 2812 2813 sa.sa_handler = sigurg; 2814 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 2815 (void) sigaction(SIGURG, &sa, NULL); 2816 2817 sigfillset(&sa.sa_mask); /* block all signals in handler */ 2818 sa.sa_flags = SA_RESTART; 2819 sa.sa_handler = sigquit; 2820 (void) sigaction(SIGHUP, &sa, NULL); 2821 (void) sigaction(SIGINT, &sa, NULL); 2822 (void) sigaction(SIGQUIT, &sa, NULL); 2823 (void) sigaction(SIGTERM, &sa, NULL); 2824 2825 sa.sa_handler = lostconn; 2826 (void) sigaction(SIGPIPE, &sa, NULL); 2827 2828 sa.sa_handler = toolong; 2829 (void) sigaction(SIGALRM, &sa, NULL); 2830 2831#ifdef F_SETOWN 2832 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 2833 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 2834#endif 2835} 2836 2837#if defined(TCPWRAPPERS) 2838static int 2839check_host(struct sockaddr *sa) 2840{ 2841 struct sockaddr_in *sin; 2842 struct hostent *hp; 2843 char *addr; 2844 2845 if (sa->sa_family != AF_INET) 2846 return 1; /*XXX*/ 2847 2848 sin = (struct sockaddr_in *)sa; 2849 hp = gethostbyaddr((char *)&sin->sin_addr, 2850 sizeof(struct in_addr), AF_INET); 2851 addr = inet_ntoa(sin->sin_addr); 2852 if (hp) { 2853 if (!hosts_ctl("ftpd", hp->h_name, addr, STRING_UNKNOWN)) { 2854 syslog(LOG_NOTICE, "tcpwrappers rejected: %s [%s]", 2855 hp->h_name, addr); 2856 return (0); 2857 } 2858 } else { 2859 if (!hosts_ctl("ftpd", STRING_UNKNOWN, addr, STRING_UNKNOWN)) { 2860 syslog(LOG_NOTICE, "tcpwrappers rejected: [%s]", addr); 2861 return (0); 2862 } 2863 } 2864 return (1); 2865} 2866#endif /* TCPWRAPPERS */ 2867 2868/* 2869 * Allocate space and return a copy of the specified dir. 2870 * If 'dir' begins with a tilde (~), expand it. 2871 */ 2872char * 2873copy_dir(char *dir, struct passwd *pw) 2874{ 2875 char *cp; 2876 char *newdir; 2877 char *user = NULL; 2878 size_t dirsiz; 2879 2880 /* Nothing to expand */ 2881 if (dir[0] != '~') 2882 return (strdup(dir)); 2883 2884 /* "dir" is of form ~user/some/dir, lookup user. */ 2885 if (dir[1] != '/' && dir[1] != '\0') { 2886 if ((cp = strchr(dir + 1, '/')) == NULL) 2887 cp = dir + strlen(dir); 2888 if ((user = malloc((size_t)(cp - dir))) == NULL) 2889 return (NULL); 2890 strlcpy(user, dir + 1, (size_t)(cp - dir)); 2891 2892 /* Only do lookup if it is a different user. */ 2893 if (strcmp(user, pw->pw_name) != 0) { 2894 if ((pw = getpwnam(user)) == NULL) { 2895 /* No such user, interpret literally */ 2896 free(user); 2897 return(strdup(dir)); 2898 } 2899 } 2900 } 2901 2902 /* 2903 * If there is no directory separator (/) then it is just pw_dir. 2904 * Otherwise, replace ~foo with pw_dir. 2905 */ 2906 if ((cp = strchr(dir + 1, '/')) == NULL) { 2907 newdir = strdup(pw->pw_dir); 2908 } else { 2909 dirsiz = strlen(cp) + strlen(pw->pw_dir) + 1; 2910 if ((newdir = malloc(dirsiz)) == NULL) { 2911 free(user); 2912 return (NULL); 2913 } 2914 strlcpy(newdir, pw->pw_dir, dirsiz); 2915 strlcat(newdir, cp, dirsiz); 2916 } 2917 2918 if (user) 2919 free(user); 2920 return(newdir); 2921} 2922