ftpd.c revision 1.75
1/* $OpenBSD: ftpd.c,v 1.75 2000/07/05 17:21:02 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. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 */ 65 66#ifndef lint 67static char copyright[] = 68"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 69 The Regents of the University of California. All rights reserved.\n"; 70#endif /* not lint */ 71 72#ifndef lint 73#if 0 74static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 75#else 76static char rcsid[] = "$NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $"; 77#endif 78#endif /* not lint */ 79 80/* 81 * FTP server. 82 */ 83#include <sys/param.h> 84#include <sys/stat.h> 85#include <sys/ioctl.h> 86#include <sys/socket.h> 87#include <sys/wait.h> 88#include <sys/mman.h> 89 90#include <netinet/in.h> 91#include <netinet/in_systm.h> 92#include <netinet/ip.h> 93#include <netinet/tcp.h> 94 95#define FTP_NAMES 96#include <arpa/ftp.h> 97#include <arpa/inet.h> 98#include <arpa/telnet.h> 99 100#include <ctype.h> 101#include <dirent.h> 102#include <err.h> 103#include <errno.h> 104#include <fcntl.h> 105#include <glob.h> 106#include <limits.h> 107#include <netdb.h> 108#include <pwd.h> 109#include <setjmp.h> 110#include <signal.h> 111#include <stdio.h> 112#include <stdlib.h> 113#include <string.h> 114#include <syslog.h> 115#include <time.h> 116#include <vis.h> 117#include <unistd.h> 118#include <util.h> 119#include <utmp.h> 120 121#if defined(TCPWRAPPERS) 122#include <tcpd.h> 123#endif /* TCPWRAPPERS */ 124 125#if defined(SKEY) 126#include <skey.h> 127#endif 128 129#include "pathnames.h" 130#include "extern.h" 131 132#ifdef __STDC__ 133#include <stdarg.h> 134#else 135#include <varargs.h> 136#endif 137 138static char version[] = "Version 6.4/OpenBSD"; 139 140extern off_t restart_point; 141extern char cbuf[]; 142 143union sockunion server_addr; 144union sockunion ctrl_addr; 145union sockunion data_source; 146union sockunion data_dest; 147union sockunion his_addr; 148union sockunion pasv_addr; 149 150int daemon_mode = 0; 151int data; 152jmp_buf errcatch, urgcatch; 153int logged_in; 154struct passwd *pw; 155int debug = 0; 156int timeout = 900; /* timeout after 15 minutes of inactivity */ 157int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 158int logging; 159int high_data_ports = 0; 160int anon_only = 0; 161int multihome = 0; 162int guest; 163int stats; 164int statfd = -1; 165int portcheck = 1; 166int dochroot; 167int type; 168int form; 169int stru; /* avoid C keyword */ 170int mode; 171int doutmp = 0; /* update utmp file */ 172int usedefault = 1; /* for data transfers */ 173int pdata = -1; /* for passive mode */ 174int family = AF_INET; 175sig_atomic_t transflag; 176off_t file_size; 177off_t byte_count; 178#if !defined(CMASK) || CMASK == 0 179#undef CMASK 180#define CMASK 027 181#endif 182int defumask = CMASK; /* default umask value */ 183int umaskchange = 1; /* allow user to change umask value. */ 184char tmpline[7]; 185char hostname[MAXHOSTNAMELEN]; 186char remotehost[MAXHOSTNAMELEN]; 187char dhostname[MAXHOSTNAMELEN]; 188char *guestpw; 189static char ttyline[20]; 190char *tty = ttyline; /* for klogin */ 191static struct utmp utmp; /* for utmp */ 192 193#if defined(TCPWRAPPERS) 194int allow_severity = LOG_INFO; 195int deny_severity = LOG_NOTICE; 196#endif /* TCPWRAPPERS */ 197 198#if defined(KERBEROS) 199int notickets = 1; 200char *krbtkfile_env = NULL; 201#endif 202 203char *ident = NULL; 204 205 206int epsvall = 0; 207 208/* 209 * Timeout intervals for retrying connections 210 * to hosts that don't accept PORT cmds. This 211 * is a kludge, but given the problems with TCP... 212 */ 213#define SWAITMAX 90 /* wait at most 90 seconds */ 214#define SWAITINT 5 /* interval between retries */ 215 216int swaitmax = SWAITMAX; 217int swaitint = SWAITINT; 218 219#ifdef HASSETPROCTITLE 220char proctitle[BUFSIZ]; /* initial part of title */ 221#endif /* HASSETPROCTITLE */ 222 223#define LOGCMD(cmd, file) \ 224 if (logging > 1) \ 225 syslog(LOG_INFO,"%s %s%s", cmd, \ 226 *(file) == '/' ? "" : curdir(), file); 227#define LOGCMD2(cmd, file1, file2) \ 228 if (logging > 1) \ 229 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 230 *(file1) == '/' ? "" : curdir(), file1, \ 231 *(file2) == '/' ? "" : curdir(), file2); 232#define LOGBYTES(cmd, file, cnt) \ 233 if (logging > 1) { \ 234 if (cnt == (off_t)-1) \ 235 syslog(LOG_INFO,"%s %s%s", cmd, \ 236 *(file) == '/' ? "" : curdir(), file); \ 237 else \ 238 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 239 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 240 } 241 242static void ack __P((char *)); 243static void myoob __P((int)); 244static int checkuser __P((char *, char *)); 245static FILE *dataconn __P((char *, off_t, char *)); 246static void dolog __P((struct sockaddr *)); 247static char *curdir __P((void)); 248static void end_login __P((void)); 249static FILE *getdatasock __P((char *)); 250static int guniquefd __P((char *, char **)); 251static void lostconn __P((int)); 252static void sigquit __P((int)); 253static int receive_data __P((FILE *, FILE *)); 254static void replydirname __P((const char *, const char *)); 255static void send_data __P((FILE *, FILE *, off_t, off_t, int)); 256static struct passwd * 257 sgetpwnam __P((char *)); 258static char *sgetsave __P((char *)); 259static void reapchild __P((int)); 260static int check_host __P((struct sockaddr *)); 261static void usage __P((void)); 262 263void logxfer __P((char *, off_t, time_t)); 264 265static char * 266curdir() 267{ 268 static char path[MAXPATHLEN+1]; /* path + '/' */ 269 270 if (getcwd(path, sizeof(path)-1) == NULL) 271 return (""); 272 if (path[1] != '\0') /* special case for root dir. */ 273 strcat(path, "/"); 274 /* For guest account, skip / since it's chrooted */ 275 return (guest ? path+1 : path); 276} 277 278char *argstr = "AdDhlMSt:T:u:UvP46"; 279 280static void 281usage() 282{ 283 syslog(LOG_ERR, 284 "usage: ftpd [-AdDhlMSUv] [-t timeout] [-T maxtimeout] [-u mask]"); 285 exit(2); 286} 287 288int 289main(argc, argv, envp) 290 int argc; 291 char *argv[]; 292 char **envp; 293{ 294 int addrlen, ch, on = 1, tos; 295 char *cp, line[LINE_MAX]; 296 FILE *fp; 297 struct hostent *hp; 298 299 tzset(); /* in case no timezone database in ~ftp */ 300 301 while ((ch = getopt(argc, argv, argstr)) != -1) { 302 switch (ch) { 303 case 'A': 304 anon_only = 1; 305 break; 306 307 case 'd': 308 debug = 1; 309 break; 310 311 case 'D': 312 daemon_mode = 1; 313 break; 314 315 case 'P': 316 portcheck = 0; 317 break; 318 319 case 'h': 320 high_data_ports = 1; 321 break; 322 323 case 'l': 324 logging++; /* > 1 == extra logging */ 325 break; 326 327 case 'M': 328 multihome = 1; 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 "ftpd: %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 'v': 369 debug = 1; 370 break; 371 372 case '4': 373 family = AF_INET; 374 break; 375 376 case '6': 377 family = AF_INET6; 378 break; 379 380 default: 381 usage(); 382 break; 383 } 384 } 385 386 (void) freopen(_PATH_DEVNULL, "w", stderr); 387 388 /* 389 * LOG_NDELAY sets up the logging connection immediately, 390 * necessary for anonymous ftp's that chroot and can't do it later. 391 */ 392 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 393 394 if (daemon_mode) { 395 int ctl_sock, fd; 396 struct servent *sv; 397 398 /* 399 * Detach from parent. 400 */ 401 if (daemon(1, 1) < 0) { 402 syslog(LOG_ERR, "failed to become a daemon"); 403 exit(1); 404 } 405 (void) signal(SIGCHLD, reapchild); 406 /* 407 * Get port number for ftp/tcp. 408 */ 409 sv = getservbyname("ftp", "tcp"); 410 if (sv == NULL) { 411 syslog(LOG_ERR, "getservbyname for ftp failed"); 412 exit(1); 413 } 414 /* 415 * Open a socket, bind it to the FTP port, and start 416 * listening. 417 */ 418 ctl_sock = socket(family, SOCK_STREAM, 0); 419 if (ctl_sock < 0) { 420 syslog(LOG_ERR, "control socket: %m"); 421 exit(1); 422 } 423 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 424 (char *)&on, sizeof(on)) < 0) 425 syslog(LOG_ERR, "control setsockopt: %m"); 426 memset(&server_addr, 0, sizeof(server_addr)); 427 server_addr.su_sin.sin_family = family; 428 switch (family) { 429 case AF_INET: 430 server_addr.su_len = sizeof(struct sockaddr_in); 431 server_addr.su_sin.sin_port = sv->s_port; 432 break; 433 case AF_INET6: 434 server_addr.su_len = sizeof(struct sockaddr_in6); 435 server_addr.su_sin6.sin6_port = sv->s_port; 436 break; 437 } 438 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 439 server_addr.su_len)) { 440 syslog(LOG_ERR, "control bind: %m"); 441 exit(1); 442 } 443 if (listen(ctl_sock, 32) < 0) { 444 syslog(LOG_ERR, "control listen: %m"); 445 exit(1); 446 } 447 /* Stash pid in pidfile */ 448 if ((fp = fopen(_PATH_FTPDPID, "w")) == NULL) 449 syslog(LOG_ERR, "can't open %s: %m", _PATH_FTPDPID); 450 else { 451 fprintf(fp, "%d\n", getpid()); 452 fchmod(fileno(fp), S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); 453 fclose(fp); 454 } 455 /* 456 * Loop forever accepting connection requests and forking off 457 * children to handle them. 458 */ 459 while (1) { 460 addrlen = sizeof(his_addr); 461 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, 462 &addrlen); 463 if (fork() == 0) { 464 /* child */ 465 (void) dup2(fd, 0); 466 (void) dup2(fd, 1); 467 close(ctl_sock); 468 break; 469 } 470 close(fd); 471 } 472 473#if defined(TCPWRAPPERS) 474 /* ..in the child. */ 475 if (!check_host((struct sockaddr *)&his_addr)) 476 exit(1); 477#endif /* TCPWRAPPERS */ 478 } else { 479 addrlen = sizeof(his_addr); 480 if (getpeername(0, (struct sockaddr *)&his_addr, 481 &addrlen) < 0) { 482 /* syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); */ 483 exit(1); 484 } 485 } 486 487 /* set this here so klogin can use it... */ 488 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 489 490 (void) signal(SIGHUP, sigquit); 491 (void) signal(SIGINT, sigquit); 492 (void) signal(SIGQUIT, sigquit); 493 (void) signal(SIGTERM, sigquit); 494 (void) signal(SIGPIPE, lostconn); 495 (void) signal(SIGCHLD, SIG_IGN); 496 if (signal(SIGURG, myoob) == SIG_ERR) 497 syslog(LOG_ERR, "signal: %m"); 498 499 addrlen = sizeof(ctrl_addr); 500 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 501 syslog(LOG_ERR, "getsockname (%s): %m", argv[0]); 502 exit(1); 503 } 504 if (his_addr.su_family == AF_INET6 505 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 506#if 1 507 /* 508 * IPv4 control connection arrived to AF_INET6 socket. 509 * I hate to do this, but this is the easiest solution. 510 */ 511 union sockunion tmp_addr; 512 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 513 514 tmp_addr = his_addr; 515 memset(&his_addr, 0, sizeof(his_addr)); 516 his_addr.su_sin.sin_family = AF_INET; 517 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 518 memcpy(&his_addr.su_sin.sin_addr, 519 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 520 sizeof(his_addr.su_sin.sin_addr)); 521 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 522 523 tmp_addr = ctrl_addr; 524 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 525 ctrl_addr.su_sin.sin_family = AF_INET; 526 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 527 memcpy(&ctrl_addr.su_sin.sin_addr, 528 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 529 sizeof(ctrl_addr.su_sin.sin_addr)); 530 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 531#else 532 while (fgets(line, sizeof(line), fd) != NULL) { 533 if ((cp = strchr(line, '\n')) != NULL) 534 *cp = '\0'; 535 lreply(530, "%s", line); 536 } 537 (void) fflush(stdout); 538 (void) fclose(fd); 539 reply(530, 540 "Connection from IPv4 mapped address is not supported."); 541 exit(0); 542#endif 543 } 544#ifdef IP_TOS 545 if (his_addr.su_family == AF_INET) { 546 tos = IPTOS_LOWDELAY; 547 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 548 sizeof(int)) < 0) 549 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 550 } 551#endif 552 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 553 554 /* Try to handle urgent data inline */ 555#ifdef SO_OOBINLINE 556 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 557 syslog(LOG_ERR, "setsockopt: %m"); 558#endif 559 560#ifdef F_SETOWN 561 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 562 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 563#endif 564 dolog((struct sockaddr *)&his_addr); 565 /* 566 * Set up default state 567 */ 568 data = -1; 569 type = TYPE_A; 570 form = FORM_N; 571 stru = STRU_F; 572 mode = MODE_S; 573 tmpline[0] = '\0'; 574 575 /* If logins are disabled, print out the message. */ 576 if ((fp = fopen(_PATH_NOLOGIN, "r")) != NULL) { 577 while (fgets(line, sizeof(line), fp) != NULL) { 578 if ((cp = strchr(line, '\n')) != NULL) 579 *cp = '\0'; 580 lreply(530, "%s", line); 581 } 582 (void) fflush(stdout); 583 (void) fclose(fp); 584 reply(530, "System not available."); 585 exit(0); 586 } 587 if ((fp = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 588 while (fgets(line, sizeof(line), fp) != NULL) { 589 if ((cp = strchr(line, '\n')) != NULL) 590 *cp = '\0'; 591 lreply(220, "%s", line); 592 } 593 (void) fflush(stdout); 594 (void) fclose(fp); 595 /* reply(220,) must follow */ 596 } 597 (void) gethostname(hostname, sizeof(hostname)); 598 599 /* Make sure hostname is fully qualified. */ 600 hp = gethostbyname(hostname); 601 if (hp != NULL) 602 strcpy(hostname, hp->h_name); 603 604 if (multihome) { 605 getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 606 dhostname, sizeof(dhostname), NULL, 0, 0); 607 } 608 609 reply(220, "%s FTP server (%s) ready.", 610 (multihome ? dhostname : hostname), version); 611 (void) setjmp(errcatch); 612 for (;;) 613 (void) yyparse(); 614 /* NOTREACHED */ 615} 616 617/* 618 * Signal handlers. 619 */ 620 621static void 622lostconn(signo) 623 int signo; 624{ 625 626 if (debug) 627 syslog(LOG_DEBUG, "lost connection"); 628 dologout(1); 629} 630 631static void 632sigquit(signo) 633 int signo; 634{ 635 syslog(LOG_ERR, "got signal %s", strerror(signo)); 636 637 dologout(1); 638} 639 640/* 641 * Helper function for sgetpwnam(). 642 */ 643static char * 644sgetsave(s) 645 char *s; 646{ 647 char *new = malloc((unsigned) strlen(s) + 1); 648 649 if (new == NULL) { 650 perror_reply(421, "Local resource failure: malloc"); 651 dologout(1); 652 /* NOTREACHED */ 653 } 654 (void) strcpy(new, s); 655 return (new); 656} 657 658/* 659 * Save the result of a getpwnam. Used for USER command, since 660 * the data returned must not be clobbered by any other command 661 * (e.g., globbing). 662 */ 663static struct passwd * 664sgetpwnam(name) 665 char *name; 666{ 667 static struct passwd save; 668 struct passwd *p; 669 670 if ((p = getpwnam(name)) == NULL) 671 return (p); 672 if (save.pw_name) { 673 free(save.pw_name); 674 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 675 free(save.pw_passwd); 676 free(save.pw_gecos); 677 free(save.pw_dir); 678 free(save.pw_shell); 679 } 680 save = *p; 681 save.pw_name = sgetsave(p->pw_name); 682 save.pw_passwd = sgetsave(p->pw_passwd); 683 save.pw_gecos = sgetsave(p->pw_gecos); 684 save.pw_dir = sgetsave(p->pw_dir); 685 save.pw_shell = sgetsave(p->pw_shell); 686 return (&save); 687} 688 689static int login_attempts; /* number of failed login attempts */ 690static int askpasswd; /* had user command, ask for passwd */ 691static char curname[16]; /* current USER name */ 692 693/* 694 * USER command. 695 * Sets global passwd pointer pw if named account exists and is acceptable; 696 * sets askpasswd if a PASS command is expected. If logged in previously, 697 * need to reset state. If name is "ftp" or "anonymous", the name is not in 698 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 699 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 700 * requesting login privileges. Disallow anyone who does not have a standard 701 * shell as returned by getusershell(). Disallow anyone mentioned in the file 702 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 703 */ 704void 705user(name) 706 char *name; 707{ 708 char *cp, *shell; 709 710 if (logged_in) { 711 if (guest) { 712 reply(530, "Can't change user from guest login."); 713 return; 714 } else if (dochroot) { 715 reply(530, "Can't change user from chroot user."); 716 return; 717 } 718 end_login(); 719 } 720 721 guest = 0; 722 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 723 if (checkuser(_PATH_FTPUSERS, "ftp") || 724 checkuser(_PATH_FTPUSERS, "anonymous")) 725 reply(530, "User %s access denied.", name); 726 else if ((pw = sgetpwnam("ftp")) != NULL) { 727 guest = 1; 728 askpasswd = 1; 729 reply(331, 730 "Guest login ok, type your name as password."); 731 } else 732 reply(530, "User %s unknown.", name); 733 if (!askpasswd && logging) 734 syslog(LOG_NOTICE, 735 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 736 return; 737 } 738 if (anon_only && !checkuser(_PATH_FTPCHROOT, name)) { 739 reply(530, "Sorry, only anonymous ftp allowed."); 740 return; 741 } 742 743 if ((pw = sgetpwnam(name))) { 744 if ((shell = pw->pw_shell) == NULL || *shell == 0) 745 shell = _PATH_BSHELL; 746 while ((cp = getusershell()) != NULL) 747 if (strcmp(cp, shell) == 0) 748 break; 749 endusershell(); 750 751 if (cp == NULL || checkuser(_PATH_FTPUSERS, name)) { 752 reply(530, "User %s access denied.", name); 753 if (logging) 754 syslog(LOG_NOTICE, 755 "FTP LOGIN REFUSED FROM %s, %s", 756 remotehost, name); 757 pw = (struct passwd *) NULL; 758 return; 759 } 760 } 761 if (logging) { 762 strncpy(curname, name, sizeof(curname)-1); 763 curname[sizeof(curname)-1] = '\0'; 764 } 765#ifdef SKEY 766 if (!skey_haskey(name)) { 767 char *myskey, *skey_keyinfo __P((char *name)); 768 769 myskey = skey_keyinfo(name); 770 reply(331, "Password [ %s ] for %s required.", 771 myskey ? myskey : "error getting challenge", name); 772 } else 773#endif 774 reply(331, "Password required for %s.", name); 775 776 askpasswd = 1; 777 /* 778 * Delay before reading passwd after first failed 779 * attempt to slow down passwd-guessing programs. 780 */ 781 if (login_attempts) 782 sleep((unsigned) login_attempts); 783} 784 785/* 786 * Check if a user is in the file "fname" 787 */ 788static int 789checkuser(fname, name) 790 char *fname; 791 char *name; 792{ 793 FILE *fp; 794 int found = 0; 795 char *p, line[BUFSIZ]; 796 797 if ((fp = fopen(fname, "r")) != NULL) { 798 while (fgets(line, sizeof(line), fp) != NULL) 799 if ((p = strchr(line, '\n')) != NULL) { 800 *p = '\0'; 801 if (line[0] == '#') 802 continue; 803 if (strcmp(line, name) == 0) { 804 found = 1; 805 break; 806 } 807 } 808 (void) fclose(fp); 809 } 810 return (found); 811} 812 813/* 814 * Terminate login as previous user, if any, resetting state; 815 * used when USER command is given or login fails. 816 */ 817static void 818end_login() 819{ 820 sigset_t allsigs; 821 sigfillset (&allsigs); 822 sigprocmask (SIG_BLOCK, &allsigs, NULL); 823 (void) seteuid((uid_t)0); 824 if (logged_in) { 825 ftpdlogwtmp(ttyline, "", ""); 826 if (doutmp) 827 logout(utmp.ut_line); 828 } 829 pw = NULL; 830 logged_in = 0; 831 guest = 0; 832 dochroot = 0; 833} 834 835void 836pass(passwd) 837 char *passwd; 838{ 839 int rval; 840 FILE *fp; 841 static char homedir[MAXPATHLEN]; 842 char rootdir[MAXPATHLEN]; 843 sigset_t allsigs; 844 845 if (logged_in || askpasswd == 0) { 846 reply(503, "Login with USER first."); 847 return; 848 } 849 askpasswd = 0; 850 if (!guest) { /* "ftp" is only account allowed no password */ 851 if (pw == NULL) { 852 useconds_t us; 853 854 /* Sleep between 1 and 3 seconds to emulate a crypt. */ 855 us = arc4random() % 3000000; 856 usleep(us); 857 rval = 1; /* failure below */ 858 goto skip; 859 } 860#if defined(KERBEROS) 861 rval = klogin(pw, "", hostname, passwd); 862 if (rval == 0) 863 goto skip; 864#endif 865#ifdef SKEY 866 if (skey_haskey(pw->pw_name) == 0 && 867 (skey_passcheck(pw->pw_name, passwd) != -1)) { 868 rval = 0; 869 goto skip; 870 } 871#endif 872 /* the strcmp does not catch null passwords! */ 873 if (strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) || 874 *pw->pw_passwd == '\0') { 875 rval = 1; /* failure */ 876 goto skip; 877 } 878 rval = 0; 879 880skip: 881 /* 882 * If rval == 1, the user failed the authentication check 883 * above. If rval == 0, either Kerberos or local authentication 884 * succeeded. 885 */ 886 if (rval) { 887 reply(530, "Login incorrect."); 888 if (logging) 889 syslog(LOG_NOTICE, 890 "FTP LOGIN FAILED FROM %s, %s", 891 remotehost, curname); 892 pw = NULL; 893 if (login_attempts++ >= 5) { 894 syslog(LOG_NOTICE, 895 "repeated login failures from %s", 896 remotehost); 897 exit(0); 898 } 899 return; 900 } 901 } else { 902 /* Save anonymous' password. */ 903 guestpw = strdup(passwd); 904 if (guestpw == (char *)NULL) 905 fatal("Out of memory"); 906 } 907 login_attempts = 0; /* this time successful */ 908 if (setegid((gid_t)pw->pw_gid) < 0) { 909 reply(550, "Can't set gid."); 910 return; 911 } 912 (void) initgroups(pw->pw_name, pw->pw_gid); 913 914 /* open wtmp before chroot */ 915 ftpdlogwtmp(ttyline, pw->pw_name, remotehost); 916 917 /* open utmp before chroot */ 918 if (doutmp) { 919 memset((void *)&utmp, 0, sizeof(utmp)); 920 (void)time(&utmp.ut_time); 921 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 922 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 923 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 924 login(&utmp); 925 } 926 927 /* open stats file before chroot */ 928 if (guest && (stats == 1) && (statfd < 0)) 929 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 930 stats = 0; 931 932 logged_in = 1; 933 934 dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name); 935 if (guest || dochroot) { 936 if (multihome && guest) { 937 struct stat ts; 938 939 /* Compute root directory. */ 940 snprintf(rootdir, sizeof(rootdir), "%s/%s", 941 pw->pw_dir, dhostname); 942 if (stat(rootdir, &ts) < 0) { 943 snprintf(rootdir, sizeof(rootdir), "%s/%s", 944 pw->pw_dir, hostname); 945 } 946 } else 947 strcpy(rootdir, pw->pw_dir); 948 } 949 if (guest) { 950 /* 951 * We MUST do a chdir() after the chroot. Otherwise 952 * the old current directory will be accessible as "." 953 * outside the new root! 954 */ 955 if (chroot(rootdir) < 0 || chdir("/") < 0) { 956 reply(550, "Can't set guest privileges."); 957 goto bad; 958 } 959 strcpy(pw->pw_dir, "/"); 960 setenv("HOME", "/", 1); 961 } else if (dochroot) { 962 if (chroot(rootdir) < 0 || chdir("/") < 0) { 963 reply(550, "Can't change root."); 964 goto bad; 965 } 966 strcpy(pw->pw_dir, "/"); 967 setenv("HOME", "/", 1); 968 } else if (chdir(pw->pw_dir) < 0) { 969 if (chdir("/") < 0) { 970 reply(530, "User %s: can't change directory to %s.", 971 pw->pw_name, pw->pw_dir); 972 goto bad; 973 } else 974 lreply(230, "No directory! Logging in with home=/"); 975 } 976 if (seteuid((uid_t)pw->pw_uid) < 0) { 977 reply(550, "Can't set uid."); 978 goto bad; 979 } 980 sigfillset(&allsigs); 981 sigprocmask(SIG_UNBLOCK,&allsigs,NULL); 982 983 /* 984 * Set home directory so that use of ~ (tilde) works correctly. 985 */ 986 if (getcwd(homedir, MAXPATHLEN) != NULL) 987 setenv("HOME", homedir, 1); 988 989 /* 990 * Display a login message, if it exists. 991 * N.B. reply(230,) must follow the message. 992 */ 993 if ((fp = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 994 char *cp, line[LINE_MAX]; 995 996 while (fgets(line, sizeof(line), fp) != NULL) { 997 if ((cp = strchr(line, '\n')) != NULL) 998 *cp = '\0'; 999 lreply(230, "%s", line); 1000 } 1001 (void) fflush(stdout); 1002 (void) fclose(fp); 1003 } 1004 if (guest) { 1005 if (ident != NULL) 1006 free(ident); 1007 ident = strdup(passwd); 1008 if (ident == (char *)NULL) 1009 fatal("Ran out of memory."); 1010 reply(230, "Guest login ok, access restrictions apply."); 1011#ifdef HASSETPROCTITLE 1012 snprintf(proctitle, sizeof(proctitle), 1013 "%s: anonymous/%.*s", remotehost, 1014 (int)(sizeof(proctitle) - sizeof(remotehost) - 1015 sizeof(": anonymous/")), passwd); 1016 setproctitle("%s", proctitle); 1017#endif /* HASSETPROCTITLE */ 1018 if (logging) 1019 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1020 remotehost, passwd); 1021 } else { 1022 reply(230, "User %s logged in.", pw->pw_name); 1023#ifdef HASSETPROCTITLE 1024 snprintf(proctitle, sizeof(proctitle), 1025 "%s: %s", remotehost, pw->pw_name); 1026 setproctitle("%s", proctitle); 1027#endif /* HASSETPROCTITLE */ 1028 if (logging) 1029 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1030 remotehost, pw->pw_name); 1031 } 1032 (void) umask(defumask); 1033 return; 1034bad: 1035 /* Forget all about it... */ 1036 end_login(); 1037} 1038 1039void 1040retrieve(cmd, name) 1041 char *cmd, *name; 1042{ 1043 FILE *fin, *dout; 1044 struct stat st; 1045 int (*closefunc) __P((FILE *)); 1046 time_t start; 1047 1048 if (cmd == 0) { 1049 fin = fopen(name, "r"), closefunc = fclose; 1050 st.st_size = 0; 1051 } else { 1052 char line[BUFSIZ]; 1053 1054 (void) snprintf(line, sizeof(line), cmd, name); 1055 name = line; 1056 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1057 st.st_size = -1; 1058 st.st_blksize = BUFSIZ; 1059 } 1060 if (fin == NULL) { 1061 if (errno != 0) { 1062 perror_reply(550, name); 1063 if (cmd == 0) { 1064 LOGCMD("get", name); 1065 } 1066 } 1067 return; 1068 } 1069 byte_count = -1; 1070 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1071 reply(550, "%s: not a plain file.", name); 1072 goto done; 1073 } 1074 if (restart_point) { 1075 if (type == TYPE_A) { 1076 off_t i, n; 1077 int c; 1078 1079 n = restart_point; 1080 i = 0; 1081 while (i++ < n) { 1082 if ((c=getc(fin)) == EOF) { 1083 perror_reply(550, name); 1084 goto done; 1085 } 1086 if (c == '\n') 1087 i++; 1088 } 1089 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1090 perror_reply(550, name); 1091 goto done; 1092 } 1093 } 1094 dout = dataconn(name, st.st_size, "w"); 1095 if (dout == NULL) 1096 goto done; 1097 time(&start); 1098 send_data(fin, dout, st.st_blksize, st.st_size, 1099 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 1100 if ((cmd == 0) && stats) 1101 logxfer(name, st.st_size, start); 1102 (void) fclose(dout); 1103 data = -1; 1104done: 1105 if (pdata >= 0) 1106 (void) close(pdata); 1107 pdata = -1; 1108 if (cmd == 0) 1109 LOGBYTES("get", name, byte_count); 1110 (*closefunc)(fin); 1111} 1112 1113void 1114store(name, mode, unique) 1115 char *name, *mode; 1116 int unique; 1117{ 1118 FILE *fout, *din; 1119 int (*closefunc) __P((FILE *)); 1120 struct stat st; 1121 int fd; 1122 1123 if (restart_point && *mode != 'a') 1124 mode = "r+"; 1125 1126 if (unique && stat(name, &st) == 0) { 1127 char *nam; 1128 1129 fd = guniquefd(name, &nam); 1130 if (fd == -1) { 1131 LOGCMD(*mode == 'w' ? "put" : "append", name); 1132 return; 1133 } 1134 name = nam; 1135 fout = fdopen(fd, mode); 1136 } else 1137 fout = fopen(name, mode); 1138 1139 closefunc = fclose; 1140 if (fout == NULL) { 1141 perror_reply(553, name); 1142 LOGCMD(*mode == 'w' ? "put" : "append", name); 1143 return; 1144 } 1145 byte_count = -1; 1146 if (restart_point) { 1147 if (type == TYPE_A) { 1148 off_t i, n; 1149 int c; 1150 1151 n = restart_point; 1152 i = 0; 1153 while (i++ < n) { 1154 if ((c=getc(fout)) == EOF) { 1155 perror_reply(550, name); 1156 goto done; 1157 } 1158 if (c == '\n') 1159 i++; 1160 } 1161 /* 1162 * We must do this seek to "current" position 1163 * because we are changing from reading to 1164 * writing. 1165 */ 1166 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1167 perror_reply(550, name); 1168 goto done; 1169 } 1170 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1171 perror_reply(550, name); 1172 goto done; 1173 } 1174 } 1175 din = dataconn(name, (off_t)-1, "r"); 1176 if (din == NULL) 1177 goto done; 1178 if (receive_data(din, fout) == 0) { 1179 if (unique) 1180 reply(226, "Transfer complete (unique file name:%s).", 1181 name); 1182 else 1183 reply(226, "Transfer complete."); 1184 } 1185 (void) fclose(din); 1186 data = -1; 1187 pdata = -1; 1188done: 1189 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1190 (*closefunc)(fout); 1191} 1192 1193static FILE * 1194getdatasock(mode) 1195 char *mode; 1196{ 1197 int on = 1, s, t, tries; 1198 sigset_t allsigs; 1199 1200 if (data >= 0) 1201 return (fdopen(data, mode)); 1202 sigfillset(&allsigs); 1203 sigprocmask (SIG_BLOCK, &allsigs, NULL); 1204 (void) seteuid((uid_t)0); 1205 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1206 if (s < 0) 1207 goto bad; 1208 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1209 (char *) &on, sizeof(on)) < 0) 1210 goto bad; 1211 /* anchor socket to avoid multi-homing problems */ 1212 data_source = ctrl_addr; 1213 data_source.su_port = htons(20); /* ftp-data port */ 1214 for (tries = 1; ; tries++) { 1215 if (bind(s, (struct sockaddr *)&data_source, 1216 data_source.su_len) >= 0) 1217 break; 1218 if (errno != EADDRINUSE || tries > 10) 1219 goto bad; 1220 sleep(tries); 1221 } 1222 (void) seteuid((uid_t)pw->pw_uid); 1223 sigfillset(&allsigs); 1224 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1225 1226#ifdef IP_TOS 1227 if (ctrl_addr.su_family == AF_INET) { 1228 on = IPTOS_THROUGHPUT; 1229 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1230 sizeof(int)) < 0) 1231 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1232 } 1233#endif 1234#ifdef TCP_NOPUSH 1235 /* 1236 * Turn off push flag to keep sender TCP from sending short packets 1237 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1238 * to set the send buffer size as well, but that may not be desirable 1239 * in heavy-load situations. 1240 */ 1241 on = 1; 1242 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof on) < 0) 1243 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1244#endif 1245#ifdef SO_SNDBUF 1246 on = 65536; 1247 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof on) < 0) 1248 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1249#endif 1250 1251 return (fdopen(s, mode)); 1252bad: 1253 /* Return the real value of errno (close may change it) */ 1254 t = errno; 1255 (void) seteuid((uid_t)pw->pw_uid); 1256 sigfillset (&allsigs); 1257 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1258 (void) close(s); 1259 errno = t; 1260 return (NULL); 1261} 1262 1263static FILE * 1264dataconn(name, size, mode) 1265 char *name; 1266 off_t size; 1267 char *mode; 1268{ 1269 char sizebuf[32]; 1270 FILE *file; 1271 int retry = 0; 1272 in_port_t *p; 1273 char *fa, *ha; 1274 int alen; 1275 1276 file_size = size; 1277 byte_count = 0; 1278 if (size != (off_t) -1) { 1279 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1280 size); 1281 } else 1282 sizebuf[0] = '\0'; 1283 if (pdata >= 0) { 1284 union sockunion from; 1285 int s, fromlen = sizeof(from); 1286 1287 signal (SIGALRM, toolong); 1288 (void) alarm ((unsigned) timeout); 1289 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1290 (void) alarm (0); 1291 if (s < 0) { 1292 reply(425, "Can't open data connection."); 1293 (void) close(pdata); 1294 pdata = -1; 1295 return (NULL); 1296 } 1297 switch (from.su_family) { 1298 case AF_INET: 1299 p = (in_port_t *)&from.su_sin.sin_port; 1300 fa = (u_char *)&from.su_sin.sin_addr; 1301 ha = (u_char *)&his_addr.su_sin.sin_addr; 1302 alen = sizeof(struct in_addr); 1303 break; 1304 case AF_INET6: 1305 p = (in_port_t *)&from.su_sin6.sin6_port; 1306 fa = (u_char *)&from.su_sin6.sin6_addr; 1307 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1308 alen = sizeof(struct in6_addr); 1309 break; 1310 default: 1311 perror_reply(425, "Can't build data connection"); 1312 (void) close(pdata); 1313 (void) close(s); 1314 pdata = -1; 1315 return (NULL); 1316 } 1317 if (from.su_family != his_addr.su_family || 1318 ntohs(*p) < IPPORT_RESERVED) { 1319 perror_reply(425, "Can't build data connection"); 1320 (void) close(pdata); 1321 (void) close(s); 1322 pdata = -1; 1323 return (NULL); 1324 } 1325 if (memcmp(fa, ha, alen) != 0) { 1326 perror_reply(435, "Can't build data connection"); 1327 (void) close(pdata); 1328 (void) close(s); 1329 pdata = -1; 1330 return (NULL); 1331 } 1332 (void) close(pdata); 1333 pdata = s; 1334 reply(150, "Opening %s mode data connection for '%s'%s.", 1335 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1336 return (fdopen(pdata, mode)); 1337 } 1338 if (data >= 0) { 1339 reply(125, "Using existing data connection for '%s'%s.", 1340 name, sizebuf); 1341 usedefault = 1; 1342 return (fdopen(data, mode)); 1343 } 1344 if (usedefault) 1345 data_dest = his_addr; 1346 usedefault = 1; 1347 file = getdatasock(mode); 1348 if (file == NULL) { 1349 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1350 1351 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1352 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1353 NI_NUMERICHOST | NI_NUMERICSERV); 1354 reply(425, "Can't create data socket (%s,%s): %s.", 1355 hbuf, pbuf, strerror(errno)); 1356 return (NULL); 1357 } 1358 data = fileno(file); 1359 1360 /* 1361 * attempt to connect to reserved port on client machine; 1362 * this looks like an attack 1363 */ 1364 switch (data_dest.su_family) { 1365 case AF_INET: 1366 p = (in_port_t *)&data_dest.su_sin.sin_port; 1367 fa = (u_char *)&data_dest.su_sin.sin_addr; 1368 ha = (u_char *)&his_addr.su_sin.sin_addr; 1369 alen = sizeof(struct in_addr); 1370 break; 1371 case AF_INET6: 1372 p = (in_port_t *)&data_dest.su_sin6.sin6_port; 1373 fa = (u_char *)&data_dest.su_sin6.sin6_addr; 1374 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1375 alen = sizeof(struct in6_addr); 1376 break; 1377 default: 1378 perror_reply(425, "Can't build data connection"); 1379 (void) fclose(file); 1380 pdata = -1; 1381 return (NULL); 1382 } 1383 if (data_dest.su_family != his_addr.su_family || 1384 ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */ 1385 perror_reply(425, "Can't build data connection"); 1386 (void) fclose(file); 1387 data = -1; 1388 return NULL; 1389 } 1390 if (memcmp(fa, ha, alen) != 0) { 1391 perror_reply(435, "Can't build data connection"); 1392 (void) fclose(file); 1393 data = -1; 1394 return NULL; 1395 } 1396 while (connect(data, (struct sockaddr *)&data_dest, 1397 data_dest.su_len) < 0) { 1398 if (errno == EADDRINUSE && retry < swaitmax) { 1399 sleep((unsigned) swaitint); 1400 retry += swaitint; 1401 continue; 1402 } 1403 perror_reply(425, "Can't build data connection"); 1404 (void) fclose(file); 1405 data = -1; 1406 return (NULL); 1407 } 1408 reply(150, "Opening %s mode data connection for '%s'%s.", 1409 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1410 return (file); 1411} 1412 1413/* 1414 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1415 * encapsulation of the data subject to Mode, Structure, and Type. 1416 * 1417 * NB: Form isn't handled. 1418 */ 1419static void 1420send_data(instr, outstr, blksize, filesize, isreg) 1421 FILE *instr, *outstr; 1422 off_t blksize; 1423 off_t filesize; 1424 int isreg; 1425{ 1426 int c, cnt, filefd, netfd; 1427 char *buf, *bp; 1428 size_t len; 1429 1430 transflag++; 1431 if (setjmp(urgcatch)) { 1432 transflag = 0; 1433 return; 1434 } 1435 switch (type) { 1436 1437 case TYPE_A: 1438 while ((c = getc(instr)) != EOF) { 1439 byte_count++; 1440 if (c == '\n') { 1441 if (ferror(outstr)) 1442 goto data_err; 1443 (void) putc('\r', outstr); 1444 } 1445 (void) putc(c, outstr); 1446 } 1447 fflush(outstr); 1448 transflag = 0; 1449 if (ferror(instr)) 1450 goto file_err; 1451 if (ferror(outstr)) 1452 goto data_err; 1453 reply(226, "Transfer complete."); 1454 return; 1455 1456 case TYPE_I: 1457 case TYPE_L: 1458 /* 1459 * isreg is only set if we are not doing restart and we 1460 * are sending a regular file 1461 */ 1462 netfd = fileno(outstr); 1463 filefd = fileno(instr); 1464 1465 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1466 buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd, 1467 (off_t)0); 1468 if (!buf) { 1469 syslog(LOG_WARNING, "mmap(%lu): %m", 1470 (unsigned long)filesize); 1471 goto oldway; 1472 } 1473 bp = buf; 1474 len = filesize; 1475 do { 1476 cnt = write(netfd, bp, len); 1477 len -= cnt; 1478 bp += cnt; 1479 if (cnt > 0) byte_count += cnt; 1480 } while(cnt > 0 && len > 0); 1481 1482 transflag = 0; 1483 munmap(buf, (size_t)filesize); 1484 if (cnt < 0) 1485 goto data_err; 1486 reply(226, "Transfer complete."); 1487 return; 1488 } 1489 1490oldway: 1491 if ((buf = malloc((u_int)blksize)) == NULL) { 1492 transflag = 0; 1493 perror_reply(451, "Local resource failure: malloc"); 1494 return; 1495 } 1496 1497 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1498 write(netfd, buf, cnt) == cnt) 1499 byte_count += cnt; 1500 transflag = 0; 1501 (void)free(buf); 1502 if (cnt != 0) { 1503 if (cnt < 0) 1504 goto file_err; 1505 goto data_err; 1506 } 1507 reply(226, "Transfer complete."); 1508 return; 1509 default: 1510 transflag = 0; 1511 reply(550, "Unimplemented TYPE %d in send_data", type); 1512 return; 1513 } 1514 1515data_err: 1516 transflag = 0; 1517 perror_reply(426, "Data connection"); 1518 return; 1519 1520file_err: 1521 transflag = 0; 1522 perror_reply(551, "Error on input file"); 1523} 1524 1525/* 1526 * Transfer data from peer to "outstr" using the appropriate encapulation of 1527 * the data subject to Mode, Structure, and Type. 1528 * 1529 * N.B.: Form isn't handled. 1530 */ 1531static int 1532receive_data(instr, outstr) 1533 FILE *instr, *outstr; 1534{ 1535 int c; 1536 int cnt, bare_lfs = 0; 1537 char buf[BUFSIZ]; 1538 1539 transflag++; 1540 if (setjmp(urgcatch)) { 1541 transflag = 0; 1542 return (-1); 1543 } 1544 switch (type) { 1545 1546 case TYPE_I: 1547 case TYPE_L: 1548 signal (SIGALRM, lostconn); 1549 1550 do { 1551 (void) alarm ((unsigned) timeout); 1552 cnt = read(fileno(instr), buf, sizeof(buf)); 1553 (void) alarm (0); 1554 1555 if (cnt > 0) { 1556 if (write(fileno(outstr), buf, cnt) != cnt) 1557 goto file_err; 1558 byte_count += cnt; 1559 } 1560 } while (cnt > 0); 1561 if (cnt < 0) 1562 goto data_err; 1563 transflag = 0; 1564 return (0); 1565 1566 case TYPE_E: 1567 reply(553, "TYPE E not implemented."); 1568 transflag = 0; 1569 return (-1); 1570 1571 case TYPE_A: 1572 while ((c = getc(instr)) != EOF) { 1573 byte_count++; 1574 if (c == '\n') 1575 bare_lfs++; 1576 while (c == '\r') { 1577 if (ferror(outstr)) 1578 goto data_err; 1579 if ((c = getc(instr)) != '\n') { 1580 (void) putc ('\r', outstr); 1581 if (c == '\0' || c == EOF) 1582 goto contin2; 1583 } 1584 } 1585 (void) putc(c, outstr); 1586 contin2: ; 1587 } 1588 fflush(outstr); 1589 if (ferror(instr)) 1590 goto data_err; 1591 if (ferror(outstr)) 1592 goto file_err; 1593 transflag = 0; 1594 if (bare_lfs) { 1595 lreply(226, 1596 "WARNING! %d bare linefeeds received in ASCII mode", 1597 bare_lfs); 1598 printf(" File may not have transferred correctly.\r\n"); 1599 } 1600 return (0); 1601 default: 1602 reply(550, "Unimplemented TYPE %d in receive_data", type); 1603 transflag = 0; 1604 return (-1); 1605 } 1606 1607data_err: 1608 transflag = 0; 1609 perror_reply(426, "Data Connection"); 1610 return (-1); 1611 1612file_err: 1613 transflag = 0; 1614 perror_reply(452, "Error writing file"); 1615 return (-1); 1616} 1617 1618void 1619statfilecmd(filename) 1620 char *filename; 1621{ 1622 FILE *fin; 1623 int c; 1624 int atstart; 1625 char line[LINE_MAX]; 1626 1627 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1628 fin = ftpd_popen(line, "r"); 1629 lreply(211, "status of %s:", filename); 1630 atstart = 1; 1631 while ((c = getc(fin)) != EOF) { 1632 if (c == '\n') { 1633 if (ferror(stdout)){ 1634 perror_reply(421, "control connection"); 1635 (void) ftpd_pclose(fin); 1636 dologout(1); 1637 /* NOTREACHED */ 1638 } 1639 if (ferror(fin)) { 1640 perror_reply(551, filename); 1641 (void) ftpd_pclose(fin); 1642 return; 1643 } 1644 (void) putc('\r', stdout); 1645 } 1646 if (atstart && isdigit(c)) 1647 (void) putc(' ', stdout); 1648 (void) putc(c, stdout); 1649 atstart = (c == '\n'); 1650 } 1651 (void) ftpd_pclose(fin); 1652 reply(211, "End of Status"); 1653} 1654 1655void 1656statcmd() 1657{ 1658 union sockunion *su; 1659 u_char *a, *p; 1660 char hbuf[MAXHOSTNAMELEN]; 1661 int ispassive; 1662 1663 lreply(211, "%s FTP server status:", hostname, version); 1664 printf(" %s\r\n", version); 1665 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1666 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST); 1667 printf(" Connected to %s", remotehost); 1668 if (strcmp(remotehost, hbuf) != 0) 1669 printf(" (%s)", hbuf); 1670 printf("\r\n"); 1671 if (logged_in) { 1672 if (guest) 1673 printf(" Logged in anonymously\r\n"); 1674 else 1675 printf(" Logged in as %s\r\n", pw->pw_name); 1676 } else if (askpasswd) 1677 printf(" Waiting for password\r\n"); 1678 else 1679 printf(" Waiting for user name\r\n"); 1680 printf(" TYPE: %s", typenames[type]); 1681 if (type == TYPE_A || type == TYPE_E) 1682 printf(", FORM: %s", formnames[form]); 1683 if (type == TYPE_L) 1684#if NBBY == 8 1685 printf(" %d", NBBY); 1686#else 1687 printf(" %d", bytesize); /* need definition! */ 1688#endif 1689 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1690 strunames[stru], modenames[mode]); 1691 ispassive = 0; 1692 if (data != -1) 1693 printf(" Data connection open\r\n"); 1694 else if (pdata != -1) { 1695 printf(" in Passive mode\r\n"); 1696 su = (union sockunion *)&pasv_addr; 1697 ispassive++; 1698 goto printaddr; 1699 } else if (usedefault == 0) { 1700 su = (union sockunion *)&data_dest; 1701printaddr: 1702 /* PASV/PORT */ 1703 if (su->su_family == AF_INET) { 1704 if (ispassive) 1705 printf("211- PASV "); 1706 else 1707 printf("211- PORT "); 1708 a = (u_char *) &su->su_sin.sin_addr; 1709 p = (u_char *) &su->su_sin.sin_port; 1710 printf("(%u,%u,%u,%u,%u,%u)\r\n", 1711 a[0], a[1], a[2], a[3], 1712 p[0], p[1]); 1713 } 1714 1715 /* LPSV/LPRT */ 1716 { 1717 int alen, af, i; 1718 1719 alen = 0; 1720 switch (su->su_family) { 1721 case AF_INET: 1722 a = (u_char *) &su->su_sin.sin_addr; 1723 p = (u_char *) &su->su_sin.sin_port; 1724 alen = sizeof(su->su_sin.sin_addr); 1725 af = 4; 1726 break; 1727 case AF_INET6: 1728 a = (u_char *) &su->su_sin6.sin6_addr; 1729 p = (u_char *) &su->su_sin6.sin6_port; 1730 alen = sizeof(su->su_sin6.sin6_addr); 1731 af = 6; 1732 break; 1733 default: 1734 af = 0; 1735 break; 1736 } 1737 if (af) { 1738 if (ispassive) 1739 printf("211- LPSV "); 1740 else 1741 printf("211- LPRT "); 1742 printf("(%u,%u", af, alen); 1743 for (i = 0; i < alen; i++) 1744 printf(",%u", a[i]); 1745 printf(",%u,%u,%u)\r\n", 2, p[0], p[1]); 1746 } 1747 } 1748 1749 /* EPRT/EPSV */ 1750epsvonly: 1751 { 1752 u_char af; 1753 1754 switch (su->su_family) { 1755 case AF_INET: 1756 af = 1; 1757 break; 1758 case AF_INET6: 1759 af = 2; 1760 break; 1761 default: 1762 af = 0; 1763 break; 1764 } 1765 if (af) { 1766 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1767 if (getnameinfo((struct sockaddr *)su, su->su_len, 1768 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1769 NI_NUMERICHOST) == 0) { 1770 if (ispassive) 1771 printf("211- EPSV "); 1772 else 1773 printf("211- EPRT "); 1774 printf("(|%u|%s|%s|)\r\n", 1775 af, hbuf, pbuf); 1776 } 1777 } 1778 } 1779 } else 1780 printf(" No data connection\r\n"); 1781 reply(211, "End of status"); 1782} 1783 1784void 1785fatal(s) 1786 char *s; 1787{ 1788 1789 reply(451, "Error in server: %s\n", s); 1790 reply(221, "Closing connection due to server error."); 1791 dologout(0); 1792 /* NOTREACHED */ 1793} 1794 1795void 1796#ifdef __STDC__ 1797reply(int n, const char *fmt, ...) 1798#else 1799reply(n, fmt, va_alist) 1800 int n; 1801 char *fmt; 1802 va_dcl 1803#endif 1804{ 1805 va_list ap; 1806#ifdef __STDC__ 1807 va_start(ap, fmt); 1808#else 1809 va_start(ap); 1810#endif 1811 (void)printf("%d ", n); 1812 (void)vprintf(fmt, ap); 1813 (void)printf("\r\n"); 1814 (void)fflush(stdout); 1815 if (debug) { 1816 syslog(LOG_DEBUG, "<--- %d ", n); 1817 vsyslog(LOG_DEBUG, fmt, ap); 1818 } 1819} 1820 1821void 1822#ifdef __STDC__ 1823lreply(int n, const char *fmt, ...) 1824#else 1825lreply(n, fmt, va_alist) 1826 int n; 1827 char *fmt; 1828 va_dcl 1829#endif 1830{ 1831 va_list ap; 1832#ifdef __STDC__ 1833 va_start(ap, fmt); 1834#else 1835 va_start(ap); 1836#endif 1837 (void)printf("%d- ", n); 1838 (void)vprintf(fmt, ap); 1839 (void)printf("\r\n"); 1840 (void)fflush(stdout); 1841 if (debug) { 1842 syslog(LOG_DEBUG, "<--- %d- ", n); 1843 vsyslog(LOG_DEBUG, fmt, ap); 1844 } 1845} 1846 1847static void 1848ack(s) 1849 char *s; 1850{ 1851 1852 reply(250, "%s command successful.", s); 1853} 1854 1855void 1856nack(s) 1857 char *s; 1858{ 1859 1860 reply(502, "%s command not implemented.", s); 1861} 1862 1863/* ARGSUSED */ 1864void 1865yyerror(s) 1866 char *s; 1867{ 1868 char *cp; 1869 1870 if ((cp = strchr(cbuf,'\n'))) 1871 *cp = '\0'; 1872 reply(500, "'%s': command not understood.", cbuf); 1873} 1874 1875void 1876delete(name) 1877 char *name; 1878{ 1879 struct stat st; 1880 1881 LOGCMD("delete", name); 1882 if (stat(name, &st) < 0) { 1883 perror_reply(550, name); 1884 return; 1885 } 1886 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1887 if (rmdir(name) < 0) { 1888 perror_reply(550, name); 1889 return; 1890 } 1891 goto done; 1892 } 1893 if (unlink(name) < 0) { 1894 perror_reply(550, name); 1895 return; 1896 } 1897done: 1898 ack("DELE"); 1899} 1900 1901void 1902cwd(path) 1903 char *path; 1904{ 1905 FILE *message; 1906 1907 if (chdir(path) < 0) 1908 perror_reply(550, path); 1909 else { 1910 if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) { 1911 char *cp, line[LINE_MAX]; 1912 1913 while (fgets(line, sizeof(line), message) != NULL) { 1914 if ((cp = strchr(line, '\n')) != NULL) 1915 *cp = '\0'; 1916 lreply(250, "%s", line); 1917 } 1918 (void) fflush(stdout); 1919 (void) fclose(message); 1920 } 1921 ack("CWD"); 1922 } 1923} 1924 1925void 1926replydirname(name, message) 1927 const char *name, *message; 1928{ 1929 char npath[MAXPATHLEN]; 1930 int i; 1931 1932 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 1933 npath[i] = *name; 1934 if (*name == '"') 1935 npath[++i] = '"'; 1936 } 1937 npath[i] = '\0'; 1938 reply(257, "\"%s\" %s", npath, message); 1939} 1940 1941void 1942makedir(name) 1943 char *name; 1944{ 1945 1946 LOGCMD("mkdir", name); 1947 if (mkdir(name, 0777) < 0) 1948 perror_reply(550, name); 1949 else 1950 replydirname(name, "directory created."); 1951} 1952 1953void 1954removedir(name) 1955 char *name; 1956{ 1957 1958 LOGCMD("rmdir", name); 1959 if (rmdir(name) < 0) 1960 perror_reply(550, name); 1961 else 1962 ack("RMD"); 1963} 1964 1965void 1966pwd() 1967{ 1968 char path[MAXPATHLEN]; 1969 1970 if (getcwd(path, sizeof path) == (char *)NULL) 1971 reply(550, "Can't get current directory: %s.", strerror(errno)); 1972 else 1973 replydirname(path, "is current directory."); 1974} 1975 1976char * 1977renamefrom(name) 1978 char *name; 1979{ 1980 struct stat st; 1981 1982 if (stat(name, &st) < 0) { 1983 perror_reply(550, name); 1984 return ((char *)0); 1985 } 1986 reply(350, "File exists, ready for destination name"); 1987 return (name); 1988} 1989 1990void 1991renamecmd(from, to) 1992 char *from, *to; 1993{ 1994 1995 LOGCMD2("rename", from, to); 1996 if (rename(from, to) < 0) 1997 perror_reply(550, "rename"); 1998 else 1999 ack("RNTO"); 2000} 2001 2002static void 2003dolog(sa) 2004 struct sockaddr *sa; 2005{ 2006 char hbuf[sizeof(remotehost)]; 2007 2008 getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0); 2009 (void) strncpy(remotehost, hbuf, sizeof(remotehost)-1); 2010 2011 remotehost[sizeof(remotehost)-1] = '\0'; 2012#ifdef HASSETPROCTITLE 2013 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2014 setproctitle(proctitle); 2015#endif /* HASSETPROCTITLE */ 2016 2017 if (logging) 2018 syslog(LOG_INFO, "connection from %s", remotehost); 2019} 2020 2021/* 2022 * Record logout in wtmp file 2023 * and exit with supplied status. 2024 */ 2025void 2026dologout(status) 2027 int status; 2028{ 2029 sigset_t allsigs; 2030 2031 transflag = 0; 2032 2033 if (logged_in) { 2034 sigfillset(&allsigs); 2035 sigprocmask(SIG_BLOCK, &allsigs, NULL); 2036 (void) seteuid((uid_t)0); 2037 ftpdlogwtmp(ttyline, "", ""); 2038 if (doutmp) 2039 logout(utmp.ut_line); 2040#if defined(KERBEROS) 2041 if (!notickets && krbtkfile_env) 2042 unlink(krbtkfile_env); 2043#endif 2044 } 2045 /* beware of flushing buffers after a SIGPIPE */ 2046 _exit(status); 2047} 2048 2049static void 2050myoob(signo) 2051 int signo; 2052{ 2053 char *cp; 2054 int save_errno = errno; 2055 2056 /* only process if transfer occurring */ 2057 if (!transflag) 2058 return; 2059 cp = tmpline; 2060 if (getline(cp, 7, stdin) == NULL) { 2061 reply(221, "You could at least say goodbye."); 2062 dologout(0); 2063 } 2064 upper(cp); 2065 if (strcmp(cp, "ABOR\r\n") == 0) { 2066 tmpline[0] = '\0'; 2067 reply(426, "Transfer aborted. Data connection closed."); 2068 reply(226, "Abort successful"); 2069 longjmp(urgcatch, 1); 2070 } 2071 if (strcmp(cp, "STAT\r\n") == 0) { 2072 tmpline[0] = '\0'; 2073 if (file_size != (off_t) -1) 2074 reply(213, "Status: %qd of %qd bytes transferred", 2075 byte_count, file_size); 2076 else 2077 reply(213, "Status: %qd bytes transferred", byte_count); 2078 } 2079 errno = save_errno; 2080} 2081 2082/* 2083 * Note: a response of 425 is not mentioned as a possible response to 2084 * the PASV command in RFC959. However, it has been blessed as 2085 * a legitimate response by Jon Postel in a telephone conversation 2086 * with Rick Adams on 25 Jan 89. 2087 */ 2088void 2089passive() 2090{ 2091 int len, on; 2092 u_char *p, *a; 2093 2094 if (pw == NULL) { 2095 reply(530, "Please login with USER and PASS"); 2096 return; 2097 } 2098 if (pdata >= 0) 2099 close(pdata); 2100 /* 2101 * XXX 2102 * At this point, it would be nice to have an algorithm that 2103 * inserted a growing delay in an attack scenario. Such a thing 2104 * would look like continual passive sockets being opened, but 2105 * nothing serious being done with them. They're not used to 2106 * move data; the entire attempt is just to use tcp FIN_WAIT 2107 * resources. 2108 */ 2109 pdata = socket(AF_INET, SOCK_STREAM, 0); 2110 if (pdata < 0) { 2111 perror_reply(425, "Can't open passive connection"); 2112 return; 2113 } 2114 2115#ifdef IP_PORTRANGE 2116 on = high_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; 2117 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2118 (char *)&on, sizeof(on)) < 0) 2119 goto pasv_error; 2120#endif 2121 2122 pasv_addr = ctrl_addr; 2123 pasv_addr.su_sin.sin_port = 0; 2124 if (bind(pdata, (struct sockaddr *)&pasv_addr, 2125 pasv_addr.su_len) < 0) 2126 goto pasv_error; 2127 2128 len = sizeof(pasv_addr); 2129 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2130 goto pasv_error; 2131 if (listen(pdata, 1) < 0) 2132 goto pasv_error; 2133 a = (u_char *) &pasv_addr.su_sin.sin_addr; 2134 p = (u_char *) &pasv_addr.su_sin.sin_port; 2135 2136 reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0], 2137 a[1], a[2], a[3], p[0], p[1]); 2138 return; 2139 2140pasv_error: 2141 (void) seteuid((uid_t)pw->pw_uid); 2142 (void) close(pdata); 2143 pdata = -1; 2144 perror_reply(425, "Can't open passive connection"); 2145 return; 2146} 2147 2148/* 2149 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2150 * 229 Entering Extended Passive Mode (|||port|) 2151 */ 2152void 2153long_passive(char *cmd, int pf) 2154{ 2155 int len, on; 2156 register u_char *p, *a; 2157 2158 if (!logged_in) { 2159 syslog(LOG_NOTICE, "long passive but not logged in"); 2160 reply(503, "Login with USER first."); 2161 return; 2162 } 2163 2164 if (pf != PF_UNSPEC) { 2165 if (ctrl_addr.su_family != pf) { 2166 switch (ctrl_addr.su_family) { 2167 case AF_INET: 2168 pf = 1; 2169 break; 2170 case AF_INET6: 2171 pf = 2; 2172 break; 2173 default: 2174 pf = 0; 2175 break; 2176 } 2177 /* 2178 * XXX 2179 * only EPRT/EPSV ready clients will understand this 2180 */ 2181 if (strcmp(cmd, "EPSV") == 0 && pf) { 2182 reply(522, "Network protocol mismatch, " 2183 "use (%d)", pf); 2184 } else 2185 reply(501, "Network protocol mismatch"); /*XXX*/ 2186 2187 return; 2188 } 2189 } 2190 2191 if (pdata >= 0) 2192 close(pdata); 2193 /* 2194 * XXX 2195 * At this point, it would be nice to have an algorithm that 2196 * inserted a growing delay in an attack scenario. Such a thing 2197 * would look like continual passive sockets being opened, but 2198 * nothing serious being done with them. They not used to move 2199 * data; the entire attempt is just to use tcp FIN_WAIT 2200 * resources. 2201 */ 2202 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2203 if (pdata < 0) { 2204 perror_reply(425, "Can't open passive connection"); 2205 return; 2206 } 2207 2208 switch (ctrl_addr.su_family) { 2209 case AF_INET: 2210#ifdef IP_PORTRANGE 2211 on = high_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; 2212 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2213 (char *)&on, sizeof(on)) < 0) 2214 goto pasv_error; 2215#endif 2216 break; 2217 case AF_INET6: 2218#ifdef IPV6_PORTRANGE 2219 on = high_data_ports ? IPV6_PORTRANGE_HIGH 2220 : IPV6_PORTRANGE_DEFAULT; 2221 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2222 (char *)&on, sizeof(on)) < 0) 2223 goto pasv_error; 2224#endif 2225 break; 2226 } 2227 2228 pasv_addr = ctrl_addr; 2229 pasv_addr.su_port = 0; 2230 (void) seteuid((uid_t) 0); 2231 if (bind(pdata, (struct sockaddr *) &pasv_addr, pasv_addr.su_len) < 0) { 2232 (void) seteuid((uid_t) pw->pw_uid); 2233 goto pasv_error; 2234 } 2235 (void) seteuid((uid_t) pw->pw_uid); 2236 len = pasv_addr.su_len; 2237 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2238 goto pasv_error; 2239 if (listen(pdata, 1) < 0) 2240 goto pasv_error; 2241 p = (u_char *) &pasv_addr.su_port; 2242 2243 if (strcmp(cmd, "LPSV") == 0) { 2244 switch (pasv_addr.su_family) { 2245 case AF_INET: 2246 a = (u_char *) &pasv_addr.su_sin.sin_addr; 2247 reply(228, 2248 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2249 4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]); 2250 return; 2251 case AF_INET6: 2252 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2253 reply(228, 2254 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u," 2255 "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2256 6, 16, a[0], a[1], a[2], a[3], a[4], 2257 a[5], a[6], a[7], a[8], a[9], a[10], 2258 a[11], a[12], a[13], a[14], a[15], 2, 2259 2, p[0], p[1]); 2260 return; 2261 } 2262 } else if (strcmp(cmd, "EPSV") == 0) { 2263 switch (pasv_addr.su_family) { 2264 case AF_INET: 2265 case AF_INET6: 2266 reply(229, "Entering Extended Passive Mode (|||%u|)", 2267 ntohs(pasv_addr.su_port)); 2268 return; 2269 } 2270 } else { 2271 /* more proper error code? */ 2272 } 2273 2274 pasv_error: 2275 (void) close(pdata); 2276 pdata = -1; 2277 perror_reply(425, "Can't open passive connection"); 2278 return; 2279} 2280 2281/* 2282 * Generate unique name for file with basename "local". 2283 * The file named "local" is already known to exist. 2284 * Generates failure reply on error. 2285 */ 2286static int 2287guniquefd(local, nam) 2288 char *local; 2289 char **nam; 2290{ 2291 static char new[MAXPATHLEN]; 2292 struct stat st; 2293 int count, len, fd; 2294 char *cp; 2295 2296 cp = strrchr(local, '/'); 2297 if (cp) 2298 *cp = '\0'; 2299 if (stat(cp ? local : ".", &st) < 0) { 2300 perror_reply(553, cp ? local : "."); 2301 return (-1); 2302 } 2303 if (cp) 2304 *cp = '/'; 2305 (void) strncpy(new, local, sizeof(new)-1); 2306 new[sizeof(new)-1] = '\0'; 2307 len = strlen(new); 2308 if (len+2+1 >= sizeof(new)-1) 2309 return (-1); 2310 cp = new + len; 2311 *cp++ = '.'; 2312 for (count = 1; count < 100; count++) { 2313 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 2314 fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666); 2315 if (fd == -1) 2316 continue; 2317 if (nam) 2318 *nam = new; 2319 return (fd); 2320 } 2321 reply(452, "Unique file name cannot be created."); 2322 return (-1); 2323} 2324 2325/* 2326 * Format and send reply containing system error number. 2327 */ 2328void 2329perror_reply(code, string) 2330 int code; 2331 char *string; 2332{ 2333 2334 reply(code, "%s: %s.", string, strerror(errno)); 2335} 2336 2337static char *onefile[] = { 2338 "", 2339 0 2340}; 2341 2342void 2343send_file_list(whichf) 2344 char *whichf; 2345{ 2346 struct stat st; 2347 DIR *dirp = NULL; 2348 struct dirent *dir; 2349 FILE *dout = NULL; 2350 char **dirlist, *dirname; 2351 int simple = 0; 2352 int freeglob = 0; 2353 glob_t gl; 2354 2355 if (strpbrk(whichf, "~{[*?") != NULL) { 2356 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 2357 2358 memset(&gl, 0, sizeof(gl)); 2359 freeglob = 1; 2360 if (glob(whichf, flags, 0, &gl)) { 2361 reply(550, "not found"); 2362 goto out; 2363 } else if (gl.gl_pathc == 0) { 2364 errno = ENOENT; 2365 perror_reply(550, whichf); 2366 goto out; 2367 } 2368 dirlist = gl.gl_pathv; 2369 } else { 2370 onefile[0] = whichf; 2371 dirlist = onefile; 2372 simple = 1; 2373 } 2374 2375 if (setjmp(urgcatch)) { 2376 transflag = 0; 2377 goto out; 2378 } 2379 while ((dirname = *dirlist++)) { 2380 if (stat(dirname, &st) < 0) { 2381 /* 2382 * If user typed "ls -l", etc, and the client 2383 * used NLST, do what the user meant. 2384 */ 2385 if (dirname[0] == '-' && *dirlist == NULL && 2386 transflag == 0) { 2387 retrieve("/bin/ls %s", dirname); 2388 goto out; 2389 } 2390 perror_reply(550, whichf); 2391 if (dout != NULL) { 2392 (void) fclose(dout); 2393 transflag = 0; 2394 data = -1; 2395 pdata = -1; 2396 } 2397 goto out; 2398 } 2399 2400 if (S_ISREG(st.st_mode)) { 2401 if (dout == NULL) { 2402 dout = dataconn("file list", (off_t)-1, "w"); 2403 if (dout == NULL) 2404 goto out; 2405 transflag++; 2406 } 2407 fprintf(dout, "%s%s\n", dirname, 2408 type == TYPE_A ? "\r" : ""); 2409 byte_count += strlen(dirname) + 1; 2410 continue; 2411 } else if (!S_ISDIR(st.st_mode)) 2412 continue; 2413 2414 if ((dirp = opendir(dirname)) == NULL) 2415 continue; 2416 2417 while ((dir = readdir(dirp)) != NULL) { 2418 char nbuf[MAXPATHLEN]; 2419 2420 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2421 continue; 2422 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2423 dir->d_namlen == 2) 2424 continue; 2425 2426 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 2427 dir->d_name); 2428 2429 /* 2430 * We have to do a stat to insure it's 2431 * not a directory or special file. 2432 */ 2433 if (simple || (stat(nbuf, &st) == 0 && 2434 S_ISREG(st.st_mode))) { 2435 if (dout == NULL) { 2436 dout = dataconn("file list", (off_t)-1, 2437 "w"); 2438 if (dout == NULL) 2439 goto out; 2440 transflag++; 2441 } 2442 if (nbuf[0] == '.' && nbuf[1] == '/') 2443 fprintf(dout, "%s%s\n", &nbuf[2], 2444 type == TYPE_A ? "\r" : ""); 2445 else 2446 fprintf(dout, "%s%s\n", nbuf, 2447 type == TYPE_A ? "\r" : ""); 2448 byte_count += strlen(nbuf) + 1; 2449 } 2450 } 2451 (void) closedir(dirp); 2452 } 2453 2454 if (dout == NULL) 2455 reply(550, "No files found."); 2456 else if (ferror(dout) != 0) 2457 perror_reply(550, "Data connection"); 2458 else 2459 reply(226, "Transfer complete."); 2460 2461 transflag = 0; 2462 if (dout != NULL) 2463 (void) fclose(dout); 2464 else { 2465 if (pdata >= 0) 2466 close(pdata); 2467 } 2468 data = -1; 2469 pdata = -1; 2470out: 2471 if (freeglob) { 2472 freeglob = 0; 2473 globfree(&gl); 2474 } 2475} 2476 2477static void 2478reapchild(signo) 2479 int signo; 2480{ 2481 int save_errno = errno; 2482 2483 while (wait3(NULL, WNOHANG, NULL) > 0) 2484 ; 2485 errno = save_errno; 2486} 2487 2488void 2489logxfer(name, size, start) 2490 char *name; 2491 off_t size; 2492 time_t start; 2493{ 2494 char buf[400 + MAXHOSTNAMELEN*4 + MAXPATHLEN*4]; 2495 char dir[MAXPATHLEN], path[MAXPATHLEN], rpath[MAXPATHLEN]; 2496 char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; 2497 char *vpw; 2498 time_t now; 2499 2500 if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) { 2501 time(&now); 2502 2503 vpw = (char *)malloc(strlen((guest) ? guestpw : pw->pw_name)*4+1); 2504 if (vpw == NULL) 2505 return; 2506 2507 snprintf(path, sizeof path, "%s/%s", dir, name); 2508 if (realpath(path, rpath) == NULL) { 2509 strncpy(rpath, path, sizeof rpath-1); 2510 rpath[sizeof rpath-1] = '\0'; 2511 } 2512 strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH); 2513 2514 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2515 strvis(vpw, (guest) ? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2516 2517 snprintf(buf, sizeof(buf), 2518 "%.24s %d %s %qd %s %c %s %c %c %s ftp %d %s %s\n", 2519 ctime(&now), now - start + (now == start), 2520 vremotehost, (long long) size, vpath, 2521 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2522 'o', ((guest) ? 'a' : 'r'), 2523 vpw, 0 /* none yet */, 2524 ((guest) ? "*" : pw->pw_name), dhostname); 2525 write(statfd, buf, strlen(buf)); 2526 free(vpw); 2527 } 2528} 2529 2530#if defined(TCPWRAPPERS) 2531static int 2532check_host(sa) 2533 struct sockaddr *sa; 2534{ 2535 struct sockaddr_in *sin; 2536 struct hostent *hp; 2537 char *addr; 2538 2539 if (sa->sa_family != AF_INET) 2540 return 1; /*XXX*/ 2541 2542 sin = (struct sockaddr_in *)sa; 2543 hp = gethostbyaddr((char *)&sin->sin_addr, 2544 sizeof(struct in_addr), AF_INET); 2545 addr = inet_ntoa(sin->sin_addr); 2546 if (hp) { 2547 if (!hosts_ctl("ftpd", hp->h_name, addr, STRING_UNKNOWN)) { 2548 syslog(LOG_NOTICE, "tcpwrappers rejected: %s [%s]", 2549 hp->h_name, addr); 2550 return (0); 2551 } 2552 } else { 2553 if (!hosts_ctl("ftpd", STRING_UNKNOWN, addr, STRING_UNKNOWN)) { 2554 syslog(LOG_NOTICE, "tcpwrappers rejected: [%s]", addr); 2555 return (0); 2556 } 2557 } 2558 return (1); 2559} 2560#endif /* TCPWRAPPERS */ 2561