ftpd.c revision 1.88
1/* $OpenBSD: ftpd.c,v 1.88 2001/01/09 05:07:01 itojun 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 <login_cap.h> 108#include <netdb.h> 109#include <pwd.h> 110#include <setjmp.h> 111#include <signal.h> 112#include <stdio.h> 113#include <stdlib.h> 114#include <string.h> 115#include <syslog.h> 116#include <time.h> 117#include <vis.h> 118#include <unistd.h> 119#include <util.h> 120#include <utmp.h> 121 122#if defined(TCPWRAPPERS) 123#include <tcpd.h> 124#endif /* TCPWRAPPERS */ 125 126#if defined(SKEY) 127#include <skey.h> 128#endif 129 130#include "pathnames.h" 131#include "extern.h" 132 133#ifdef __STDC__ 134#include <stdarg.h> 135#else 136#include <varargs.h> 137#endif 138 139static char version[] = "Version 6.5/OpenBSD"; 140 141extern off_t restart_point; 142extern char cbuf[]; 143 144union sockunion server_addr; 145union sockunion ctrl_addr; 146union sockunion data_source; 147union sockunion data_dest; 148union sockunion his_addr; 149union sockunion pasv_addr; 150 151int daemon_mode = 0; 152int data; 153jmp_buf errcatch, urgcatch; 154int logged_in; 155struct passwd *pw; 156int debug = 0; 157int timeout = 900; /* timeout after 15 minutes of inactivity */ 158int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 159int logging; 160int high_data_ports = 0; 161int anon_only = 0; 162int multihome = 0; 163int guest; 164int stats; 165int statfd = -1; 166int portcheck = 1; 167int dochroot; 168int type; 169int form; 170int stru; /* avoid C keyword */ 171int mode; 172int doutmp = 0; /* update utmp file */ 173int usedefault = 1; /* for data transfers */ 174int pdata = -1; /* for passive mode */ 175int family = AF_INET; 176sig_atomic_t transflag; 177off_t file_size; 178off_t byte_count; 179#if !defined(CMASK) || CMASK == 0 180#undef CMASK 181#define CMASK 022 182#endif 183int defumask = CMASK; /* default umask value */ 184int umaskchange = 1; /* allow user to change umask value. */ 185char tmpline[7]; 186char hostname[MAXHOSTNAMELEN]; 187char remotehost[MAXHOSTNAMELEN]; 188char dhostname[MAXHOSTNAMELEN]; 189char *guestpw; 190static char ttyline[20]; 191char *tty = ttyline; /* for klogin */ 192static struct utmp utmp; /* for utmp */ 193static login_cap_t *lc; 194 195#if defined(TCPWRAPPERS) 196int allow_severity = LOG_INFO; 197int deny_severity = LOG_NOTICE; 198#endif /* TCPWRAPPERS */ 199 200#if defined(KERBEROS) 201int notickets = 1; 202char *krbtkfile_env = NULL; 203#endif 204 205char *ident = NULL; 206 207 208int epsvall = 0; 209 210/* 211 * Timeout intervals for retrying connections 212 * to hosts that don't accept PORT cmds. This 213 * is a kludge, but given the problems with TCP... 214 */ 215#define SWAITMAX 90 /* wait at most 90 seconds */ 216#define SWAITINT 5 /* interval between retries */ 217 218int swaitmax = SWAITMAX; 219int swaitint = SWAITINT; 220 221#ifdef HASSETPROCTITLE 222char proctitle[BUFSIZ]; /* initial part of title */ 223#endif /* HASSETPROCTITLE */ 224 225#define LOGCMD(cmd, file) \ 226 if (logging > 1) \ 227 syslog(LOG_INFO,"%s %s%s", cmd, \ 228 *(file) == '/' ? "" : curdir(), file); 229#define LOGCMD2(cmd, file1, file2) \ 230 if (logging > 1) \ 231 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 232 *(file1) == '/' ? "" : curdir(), file1, \ 233 *(file2) == '/' ? "" : curdir(), file2); 234#define LOGBYTES(cmd, file, cnt) \ 235 if (logging > 1) { \ 236 if (cnt == (off_t)-1) \ 237 syslog(LOG_INFO,"%s %s%s", cmd, \ 238 *(file) == '/' ? "" : curdir(), file); \ 239 else \ 240 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 241 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 242 } 243 244static void ack __P((char *)); 245static void myoob __P((int)); 246static int checkuser __P((char *, char *)); 247static FILE *dataconn __P((char *, off_t, char *)); 248static void dolog __P((struct sockaddr *)); 249static char *copy_dir __P((char *, struct passwd *)); 250static char *curdir __P((void)); 251static void end_login __P((void)); 252static FILE *getdatasock __P((char *)); 253static int guniquefd __P((char *, char **)); 254static void lostconn __P((int)); 255static void sigquit __P((int)); 256static int receive_data __P((FILE *, FILE *)); 257static void replydirname __P((const char *, const char *)); 258static void send_data __P((FILE *, FILE *, off_t, off_t, int)); 259static struct passwd * 260 sgetpwnam __P((char *)); 261static char *sgetsave __P((char *)); 262static void reapchild __P((int)); 263static int check_host __P((struct sockaddr *)); 264static void usage __P((void)); 265 266void logxfer __P((char *, off_t, time_t)); 267 268static char * 269curdir() 270{ 271 static char path[MAXPATHLEN+1]; /* path + '/' */ 272 273 if (getcwd(path, sizeof(path)-1) == NULL) 274 return (""); 275 if (path[1] != '\0') /* special case for root dir. */ 276 strcat(path, "/"); 277 /* For guest account, skip / since it's chrooted */ 278 return (guest ? path+1 : path); 279} 280 281char *argstr = "AdDhlMSt:T:u:UvP46"; 282 283static void 284usage() 285{ 286 syslog(LOG_ERR, 287 "usage: ftpd [-AdDhlMSUv] [-t timeout] [-T maxtimeout] [-u mask]"); 288 exit(2); 289} 290 291int 292main(argc, argv, envp) 293 int argc; 294 char *argv[]; 295 char **envp; 296{ 297 int addrlen, ch, on = 1, tos; 298 char *cp, line[LINE_MAX]; 299 FILE *fp; 300 struct hostent *hp; 301 302 tzset(); /* in case no timezone database in ~ftp */ 303 304 while ((ch = getopt(argc, argv, argstr)) != -1) { 305 switch (ch) { 306 case 'A': 307 anon_only = 1; 308 break; 309 310 case 'd': 311 debug = 1; 312 break; 313 314 case 'D': 315 daemon_mode = 1; 316 break; 317 318 case 'P': 319 portcheck = 0; 320 break; 321 322 case 'h': 323 high_data_ports = 1; 324 break; 325 326 case 'l': 327 logging++; /* > 1 == extra logging */ 328 break; 329 330 case 'M': 331 multihome = 1; 332 break; 333 334 case 'S': 335 stats = 1; 336 break; 337 338 case 't': 339 timeout = atoi(optarg); 340 if (maxtimeout < timeout) 341 maxtimeout = timeout; 342 break; 343 344 case 'T': 345 maxtimeout = atoi(optarg); 346 if (timeout > maxtimeout) 347 timeout = maxtimeout; 348 break; 349 350 case 'u': 351 { 352 long val = 0; 353 char *p; 354 umaskchange = 0; 355 356 val = strtol(optarg, &p, 8); 357 if (*p != '\0' || val < 0 || (val & ~ACCESSPERMS)) { 358 syslog(LOG_ERR, 359 "ftpd: %s is a bad value for -u, aborting..", 360 optarg); 361 exit(2); 362 } else 363 defumask = val; 364 break; 365 } 366 367 case 'U': 368 doutmp = 1; 369 break; 370 371 case 'v': 372 debug = 1; 373 break; 374 375 case '4': 376 family = AF_INET; 377 break; 378 379 case '6': 380 family = AF_INET6; 381 break; 382 383 default: 384 usage(); 385 break; 386 } 387 } 388 389 (void) freopen(_PATH_DEVNULL, "w", stderr); 390 391 /* 392 * LOG_NDELAY sets up the logging connection immediately, 393 * necessary for anonymous ftp's that chroot and can't do it later. 394 */ 395 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 396 397 if (daemon_mode) { 398 int ctl_sock, fd; 399 struct servent *sv; 400 401 /* 402 * Detach from parent. 403 */ 404 if (daemon(1, 1) < 0) { 405 syslog(LOG_ERR, "failed to become a daemon"); 406 exit(1); 407 } 408 (void) signal(SIGCHLD, reapchild); 409 /* 410 * Get port number for ftp/tcp. 411 */ 412 sv = getservbyname("ftp", "tcp"); 413 if (sv == NULL) { 414 syslog(LOG_ERR, "getservbyname for ftp failed"); 415 exit(1); 416 } 417 /* 418 * Open a socket, bind it to the FTP port, and start 419 * listening. 420 */ 421 ctl_sock = socket(family, SOCK_STREAM, 0); 422 if (ctl_sock < 0) { 423 syslog(LOG_ERR, "control socket: %m"); 424 exit(1); 425 } 426 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 427 (char *)&on, sizeof(on)) < 0) 428 syslog(LOG_ERR, "control setsockopt: %m"); 429 memset(&server_addr, 0, sizeof(server_addr)); 430 server_addr.su_sin.sin_family = family; 431 switch (family) { 432 case AF_INET: 433 server_addr.su_len = sizeof(struct sockaddr_in); 434 server_addr.su_sin.sin_port = sv->s_port; 435 break; 436 case AF_INET6: 437 server_addr.su_len = sizeof(struct sockaddr_in6); 438 server_addr.su_sin6.sin6_port = sv->s_port; 439 break; 440 } 441 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 442 server_addr.su_len)) { 443 syslog(LOG_ERR, "control bind: %m"); 444 exit(1); 445 } 446 if (listen(ctl_sock, 32) < 0) { 447 syslog(LOG_ERR, "control listen: %m"); 448 exit(1); 449 } 450 /* Stash pid in pidfile */ 451 if ((fp = fopen(_PATH_FTPDPID, "w")) == NULL) 452 syslog(LOG_ERR, "can't open %s: %m", _PATH_FTPDPID); 453 else { 454 fprintf(fp, "%d\n", getpid()); 455 fchmod(fileno(fp), S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); 456 fclose(fp); 457 } 458 /* 459 * Loop forever accepting connection requests and forking off 460 * children to handle them. 461 */ 462 while (1) { 463 addrlen = sizeof(his_addr); 464 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, 465 &addrlen); 466 if (fork() == 0) { 467 /* child */ 468 (void) dup2(fd, 0); 469 (void) dup2(fd, 1); 470 close(ctl_sock); 471 break; 472 } 473 close(fd); 474 } 475 476#if defined(TCPWRAPPERS) 477 /* ..in the child. */ 478 if (!check_host((struct sockaddr *)&his_addr)) 479 exit(1); 480#endif /* TCPWRAPPERS */ 481 } else { 482 addrlen = sizeof(his_addr); 483 if (getpeername(0, (struct sockaddr *)&his_addr, 484 &addrlen) < 0) { 485 /* syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); */ 486 exit(1); 487 } 488 } 489 490 /* set this here so klogin can use it... */ 491 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 492 493 (void) signal(SIGHUP, sigquit); 494 (void) signal(SIGINT, sigquit); 495 (void) signal(SIGQUIT, sigquit); 496 (void) signal(SIGTERM, sigquit); 497 (void) signal(SIGPIPE, lostconn); 498 (void) signal(SIGCHLD, SIG_IGN); 499 if (signal(SIGURG, myoob) == SIG_ERR) 500 syslog(LOG_ERR, "signal: %m"); 501 502 addrlen = sizeof(ctrl_addr); 503 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 504 syslog(LOG_ERR, "getsockname (%s): %m", argv[0]); 505 exit(1); 506 } 507 if (his_addr.su_family == AF_INET6 508 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 509#if 1 510 /* 511 * IPv4 control connection arrived to AF_INET6 socket. 512 * I hate to do this, but this is the easiest solution. 513 */ 514 union sockunion tmp_addr; 515 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 516 517 tmp_addr = his_addr; 518 memset(&his_addr, 0, sizeof(his_addr)); 519 his_addr.su_sin.sin_family = AF_INET; 520 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 521 memcpy(&his_addr.su_sin.sin_addr, 522 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 523 sizeof(his_addr.su_sin.sin_addr)); 524 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 525 526 tmp_addr = ctrl_addr; 527 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 528 ctrl_addr.su_sin.sin_family = AF_INET; 529 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 530 memcpy(&ctrl_addr.su_sin.sin_addr, 531 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 532 sizeof(ctrl_addr.su_sin.sin_addr)); 533 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 534#else 535 while (fgets(line, sizeof(line), fd) != NULL) { 536 if ((cp = strchr(line, '\n')) != NULL) 537 *cp = '\0'; 538 lreply(530, "%s", line); 539 } 540 (void) fflush(stdout); 541 (void) fclose(fd); 542 reply(530, 543 "Connection from IPv4 mapped address is not supported."); 544 exit(0); 545#endif 546 } 547#ifdef IP_TOS 548 if (his_addr.su_family == AF_INET) { 549 tos = IPTOS_LOWDELAY; 550 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 551 sizeof(int)) < 0) 552 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 553 } 554#endif 555 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 556 557 /* Try to handle urgent data inline */ 558#ifdef SO_OOBINLINE 559 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 560 syslog(LOG_ERR, "setsockopt: %m"); 561#endif 562 563#ifdef F_SETOWN 564 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 565 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 566#endif 567 dolog((struct sockaddr *)&his_addr); 568 /* 569 * Set up default state 570 */ 571 data = -1; 572 type = TYPE_A; 573 form = FORM_N; 574 stru = STRU_F; 575 mode = MODE_S; 576 tmpline[0] = '\0'; 577 578 /* If logins are disabled, print out the message. */ 579 if ((fp = fopen(_PATH_NOLOGIN, "r")) != NULL) { 580 while (fgets(line, sizeof(line), fp) != NULL) { 581 if ((cp = strchr(line, '\n')) != NULL) 582 *cp = '\0'; 583 lreply(530, "%s", line); 584 } 585 (void) fflush(stdout); 586 (void) fclose(fp); 587 reply(530, "System not available."); 588 exit(0); 589 } 590 if ((fp = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 591 while (fgets(line, sizeof(line), fp) != NULL) { 592 if ((cp = strchr(line, '\n')) != NULL) 593 *cp = '\0'; 594 lreply(220, "%s", line); 595 } 596 (void) fflush(stdout); 597 (void) fclose(fp); 598 /* reply(220,) must follow */ 599 } 600 (void) gethostname(hostname, sizeof(hostname)); 601 602 /* Make sure hostname is fully qualified. */ 603 hp = gethostbyname(hostname); 604 if (hp != NULL) 605 strcpy(hostname, hp->h_name); 606 607 if (multihome) { 608 getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 609 dhostname, sizeof(dhostname), NULL, 0, 0); 610 } 611 612 reply(220, "%s FTP server (%s) ready.", 613 (multihome ? dhostname : hostname), version); 614 (void) setjmp(errcatch); 615 for (;;) 616 (void) yyparse(); 617 /* NOTREACHED */ 618} 619 620/* 621 * Signal handlers. 622 */ 623 624static void 625lostconn(signo) 626 int signo; 627{ 628 629 if (debug) 630 syslog(LOG_DEBUG, "lost connection"); 631 dologout(1); 632} 633 634static void 635sigquit(signo) 636 int signo; 637{ 638 syslog(LOG_ERR, "got signal %s", strerror(signo)); 639 640 dologout(1); 641} 642 643/* 644 * Helper function for sgetpwnam(). 645 */ 646static char * 647sgetsave(s) 648 char *s; 649{ 650 char *new = malloc((unsigned) strlen(s) + 1); 651 652 if (new == NULL) { 653 perror_reply(421, "Local resource failure: malloc"); 654 dologout(1); 655 /* NOTREACHED */ 656 } 657 (void) strcpy(new, s); 658 return (new); 659} 660 661/* 662 * Save the result of a getpwnam. Used for USER command, since 663 * the data returned must not be clobbered by any other command 664 * (e.g., globbing). 665 */ 666static struct passwd * 667sgetpwnam(name) 668 char *name; 669{ 670 static struct passwd save; 671 struct passwd *p; 672 673 if ((p = getpwnam(name)) == NULL) 674 return (p); 675 if (save.pw_name) { 676 free(save.pw_name); 677 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 678 free(save.pw_passwd); 679 free(save.pw_class); 680 free(save.pw_gecos); 681 free(save.pw_dir); 682 free(save.pw_shell); 683 } 684 save = *p; 685 save.pw_name = sgetsave(p->pw_name); 686 save.pw_passwd = sgetsave(p->pw_passwd); 687 save.pw_class = sgetsave(p->pw_class); 688 save.pw_gecos = sgetsave(p->pw_gecos); 689 save.pw_dir = sgetsave(p->pw_dir); 690 save.pw_shell = sgetsave(p->pw_shell); 691 return (&save); 692} 693 694static int login_attempts; /* number of failed login attempts */ 695static int askpasswd; /* had user command, ask for passwd */ 696static char curname[16]; /* current USER name */ 697 698/* 699 * USER command. 700 * Sets global passwd pointer pw if named account exists and is acceptable; 701 * sets askpasswd if a PASS command is expected. If logged in previously, 702 * need to reset state. If name is "ftp" or "anonymous", the name is not in 703 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 704 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 705 * requesting login privileges. Disallow anyone who does not have a standard 706 * shell as returned by getusershell(). Disallow anyone mentioned in the file 707 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 708 */ 709void 710user(name) 711 char *name; 712{ 713 char *cp, *shell; 714 715 if (lc) { 716 login_close(lc); 717 lc = NULL; 718 } 719 720 if (logged_in) { 721 if (guest) { 722 reply(530, "Can't change user from guest login."); 723 return; 724 } else if (dochroot) { 725 reply(530, "Can't change user from chroot user."); 726 return; 727 } 728 end_login(); 729 } 730 731 guest = 0; 732 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 733 if (checkuser(_PATH_FTPUSERS, "ftp") || 734 checkuser(_PATH_FTPUSERS, "anonymous")) 735 reply(530, "User %s access denied.", name); 736 else if ((pw = sgetpwnam("ftp")) != NULL) { 737 guest = 1; 738 askpasswd = 1; 739 lc = login_getclass(pw->pw_class); 740 reply(331, 741 "Guest login ok, type your name as password."); 742 } else 743 reply(530, "User %s unknown.", name); 744 if (!askpasswd && logging) 745 syslog(LOG_NOTICE, 746 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 747 return; 748 } 749 if (anon_only && !checkuser(_PATH_FTPCHROOT, name)) { 750 reply(530, "Sorry, only anonymous ftp allowed."); 751 return; 752 } 753 754 if ((pw = sgetpwnam(name))) { 755 if ((shell = pw->pw_shell) == NULL || *shell == 0) 756 shell = _PATH_BSHELL; 757 while ((cp = getusershell()) != NULL) 758 if (strcmp(cp, shell) == 0) 759 break; 760 endusershell(); 761 762 if (cp == NULL || checkuser(_PATH_FTPUSERS, name)) { 763 reply(530, "User %s access denied.", name); 764 if (logging) 765 syslog(LOG_NOTICE, 766 "FTP LOGIN REFUSED FROM %s, %s", 767 remotehost, name); 768 pw = (struct passwd *) NULL; 769 return; 770 } 771 lc = login_getclass(pw->pw_class); 772 } 773 if (logging) { 774 strncpy(curname, name, sizeof(curname)-1); 775 curname[sizeof(curname)-1] = '\0'; 776 } 777#ifdef SKEY 778 if (!skey_haskey(name)) { 779 char *myskey, *skey_keyinfo __P((char *name)); 780 781 myskey = skey_keyinfo(name); 782 reply(331, "Password [ %s ] for %s required.", 783 myskey ? myskey : "error getting challenge", name); 784 } else 785#endif 786 reply(331, "Password required for %s.", name); 787 788 askpasswd = 1; 789 /* 790 * Delay before reading passwd after first failed 791 * attempt to slow down passwd-guessing programs. 792 */ 793 if (login_attempts) 794 sleep((unsigned) login_attempts); 795} 796 797/* 798 * Check if a user is in the file "fname" 799 */ 800static int 801checkuser(fname, name) 802 char *fname; 803 char *name; 804{ 805 FILE *fp; 806 int found = 0; 807 char *p, line[BUFSIZ]; 808 809 if ((fp = fopen(fname, "r")) != NULL) { 810 while (fgets(line, sizeof(line), fp) != NULL) 811 if ((p = strchr(line, '\n')) != NULL) { 812 *p = '\0'; 813 if (line[0] == '#') 814 continue; 815 if (strcmp(line, name) == 0) { 816 found = 1; 817 break; 818 } 819 } 820 (void) fclose(fp); 821 } 822 return (found); 823} 824 825/* 826 * Terminate login as previous user, if any, resetting state; 827 * used when USER command is given or login fails. 828 */ 829static void 830end_login() 831{ 832 sigset_t allsigs; 833 sigfillset (&allsigs); 834 sigprocmask (SIG_BLOCK, &allsigs, NULL); 835 (void) seteuid((uid_t)0); 836 if (logged_in) { 837 ftpdlogwtmp(ttyline, "", ""); 838 if (doutmp) 839 logout(utmp.ut_line); 840 } 841 pw = NULL; 842 /* umask is restored in ftpcmd.y */ 843 setusercontext(NULL, getpwuid(0), (uid_t)0, 844 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES); 845 logged_in = 0; 846 guest = 0; 847 dochroot = 0; 848} 849 850void 851pass(passwd) 852 char *passwd; 853{ 854 int rval, flags; 855 FILE *fp; 856 static char homedir[MAXPATHLEN]; 857 char *dir, rootdir[MAXPATHLEN]; 858 sigset_t allsigs; 859 860 if (logged_in || askpasswd == 0) { 861 reply(503, "Login with USER first."); 862 return; 863 } 864 askpasswd = 0; 865 if (!guest) { /* "ftp" is only account allowed no password */ 866 if (pw == NULL) { 867 useconds_t us; 868 869 /* Sleep between 1 and 3 seconds to emulate a crypt. */ 870 us = arc4random() % 3000000; 871 usleep(us); 872 rval = 1; /* failure below */ 873 goto skip; 874 } 875#if defined(KERBEROS) 876 rval = klogin(pw, "", hostname, passwd); 877 if (rval == 0) 878 goto skip; 879#endif 880#ifdef SKEY 881 if (skey_haskey(pw->pw_name) == 0 && 882 (skey_passcheck(pw->pw_name, passwd) != -1)) { 883 rval = 0; 884 goto skip; 885 } 886#endif 887 /* the strcmp does not catch null passwords! */ 888 if (strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) || 889 *pw->pw_passwd == '\0') { 890 rval = 1; /* failure */ 891 goto skip; 892 } 893 rval = 0; 894 895skip: 896 /* 897 * If rval == 1, the user failed the authentication check 898 * above. If rval == 0, either Kerberos or local authentication 899 * succeeded. 900 */ 901 if (rval) { 902 reply(530, "Login incorrect."); 903 if (logging) 904 syslog(LOG_NOTICE, 905 "FTP LOGIN FAILED FROM %s, %s", 906 remotehost, curname); 907 pw = NULL; 908 if (login_attempts++ >= 5) { 909 syslog(LOG_NOTICE, 910 "repeated login failures from %s", 911 remotehost); 912 exit(0); 913 } 914 return; 915 } 916 } else { 917 /* Save anonymous' password. */ 918 guestpw = strdup(passwd); 919 if (guestpw == (char *)NULL) 920 fatal("Out of memory"); 921 } 922 login_attempts = 0; /* this time successful */ 923 if (setegid((gid_t)pw->pw_gid) < 0) { 924 reply(550, "Can't set gid."); 925 return; 926 } 927 /* set umask via setusercontext() unless -u flag was given. */ 928 flags = LOGIN_SETGROUP|LOGIN_SETPRIORITY|LOGIN_SETRESOURCES; 929 if (umaskchange) 930 flags |= LOGIN_SETUMASK; 931 else 932 (void) umask(defumask); 933 setusercontext(lc, pw, (uid_t)0, flags); 934 935 /* open wtmp before chroot */ 936 ftpdlogwtmp(ttyline, pw->pw_name, remotehost); 937 938 /* open utmp before chroot */ 939 if (doutmp) { 940 memset((void *)&utmp, 0, sizeof(utmp)); 941 (void)time(&utmp.ut_time); 942 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 943 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 944 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 945 login(&utmp); 946 } 947 948 /* open stats file before chroot */ 949 if (guest && (stats == 1) && (statfd < 0)) 950 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 951 stats = 0; 952 953 logged_in = 1; 954 955 dochroot = login_getcapbool(lc, "ftp-chroot", 0) || 956 checkuser(_PATH_FTPCHROOT, pw->pw_name); 957 if ((dir = login_getcapstr(lc, "ftp-dir", NULL, NULL))) { 958 char *newdir; 959 960 newdir = copy_dir(dir, pw); 961 if (newdir == NULL) { 962 perror_reply(421, "Local resource failure: malloc"); 963 dologout(1); 964 /* NOTREACHED */ 965 } 966 free(pw->pw_dir); 967 pw->pw_dir = newdir; 968 } 969 if (guest || dochroot) { 970 if (multihome && guest) { 971 struct stat ts; 972 973 /* Compute root directory. */ 974 snprintf(rootdir, sizeof(rootdir), "%s/%s", 975 pw->pw_dir, dhostname); 976 if (stat(rootdir, &ts) < 0) { 977 snprintf(rootdir, sizeof(rootdir), "%s/%s", 978 pw->pw_dir, hostname); 979 } 980 } else 981 strcpy(rootdir, pw->pw_dir); 982 } 983 if (guest) { 984 /* 985 * We MUST do a chdir() after the chroot. Otherwise 986 * the old current directory will be accessible as "." 987 * outside the new root! 988 */ 989 if (chroot(rootdir) < 0 || chdir("/") < 0) { 990 reply(550, "Can't set guest privileges."); 991 goto bad; 992 } 993 strcpy(pw->pw_dir, "/"); 994 if (setenv("HOME", "/", 1) == -1) { 995 reply(550, "Can't setup environment."); 996 goto bad; 997 } 998 } else if (dochroot) { 999 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1000 reply(550, "Can't change root."); 1001 goto bad; 1002 } 1003 strcpy(pw->pw_dir, "/"); 1004 if (setenv("HOME", "/", 1) == -1) { 1005 reply(550, "Can't setup environment."); 1006 goto bad; 1007 } 1008 } else if (chdir(pw->pw_dir) < 0) { 1009 if (chdir("/") < 0) { 1010 reply(530, "User %s: can't change directory to %s.", 1011 pw->pw_name, pw->pw_dir); 1012 goto bad; 1013 } else 1014 lreply(230, "No directory! Logging in with home=/"); 1015 } 1016 if (seteuid((uid_t)pw->pw_uid) < 0) { 1017 reply(550, "Can't set uid."); 1018 goto bad; 1019 } 1020 sigfillset(&allsigs); 1021 sigprocmask(SIG_UNBLOCK, &allsigs, NULL); 1022 1023 /* 1024 * Set home directory so that use of ~ (tilde) works correctly. 1025 */ 1026 if (getcwd(homedir, MAXPATHLEN) != NULL) { 1027 if (setenv("HOME", homedir, 1) == -1) { 1028 reply(550, "Can't setup environment."); 1029 goto bad; 1030 } 1031 } 1032 1033 /* 1034 * Display a login message, if it exists. 1035 * N.B. reply(230,) must follow the message. 1036 */ 1037 if ((fp = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 1038 char *cp, line[LINE_MAX]; 1039 1040 while (fgets(line, sizeof(line), fp) != NULL) { 1041 if ((cp = strchr(line, '\n')) != NULL) 1042 *cp = '\0'; 1043 lreply(230, "%s", line); 1044 } 1045 (void) fflush(stdout); 1046 (void) fclose(fp); 1047 } 1048 if (guest) { 1049 if (ident != NULL) 1050 free(ident); 1051 ident = strdup(passwd); 1052 if (ident == NULL) 1053 fatal("Ran out of memory."); 1054 reply(230, "Guest login ok, access restrictions apply."); 1055#ifdef HASSETPROCTITLE 1056 snprintf(proctitle, sizeof(proctitle), 1057 "%s: anonymous/%.*s", remotehost, 1058 (int)(sizeof(proctitle) - sizeof(remotehost) - 1059 sizeof(": anonymous/")), passwd); 1060 setproctitle("%s", proctitle); 1061#endif /* HASSETPROCTITLE */ 1062 if (logging) 1063 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1064 remotehost, passwd); 1065 } else { 1066 reply(230, "User %s logged in.", pw->pw_name); 1067#ifdef HASSETPROCTITLE 1068 snprintf(proctitle, sizeof(proctitle), 1069 "%s: %s", remotehost, pw->pw_name); 1070 setproctitle("%s", proctitle); 1071#endif /* HASSETPROCTITLE */ 1072 if (logging) 1073 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1074 remotehost, pw->pw_name); 1075 } 1076 login_close(lc); 1077 lc = NULL; 1078 return; 1079bad: 1080 /* Forget all about it... */ 1081 login_close(lc); 1082 lc = NULL; 1083 end_login(); 1084} 1085 1086void 1087retrieve(cmd, name) 1088 char *cmd, *name; 1089{ 1090 FILE *fin, *dout; 1091 struct stat st; 1092 int (*closefunc) __P((FILE *)); 1093 time_t start; 1094 1095 if (cmd == 0) { 1096 fin = fopen(name, "r"), closefunc = fclose; 1097 st.st_size = 0; 1098 } else { 1099 char line[BUFSIZ]; 1100 1101 (void) snprintf(line, sizeof(line), cmd, name); 1102 name = line; 1103 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1104 st.st_size = -1; 1105 st.st_blksize = BUFSIZ; 1106 } 1107 if (fin == NULL) { 1108 if (errno != 0) { 1109 perror_reply(550, name); 1110 if (cmd == 0) { 1111 LOGCMD("get", name); 1112 } 1113 } 1114 return; 1115 } 1116 byte_count = -1; 1117 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1118 reply(550, "%s: not a plain file.", name); 1119 goto done; 1120 } 1121 if (restart_point) { 1122 if (type == TYPE_A) { 1123 off_t i, n; 1124 int c; 1125 1126 n = restart_point; 1127 i = 0; 1128 while (i++ < n) { 1129 if ((c=getc(fin)) == EOF) { 1130 perror_reply(550, name); 1131 goto done; 1132 } 1133 if (c == '\n') 1134 i++; 1135 } 1136 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1137 perror_reply(550, name); 1138 goto done; 1139 } 1140 } 1141 dout = dataconn(name, st.st_size, "w"); 1142 if (dout == NULL) 1143 goto done; 1144 time(&start); 1145 send_data(fin, dout, st.st_blksize, st.st_size, 1146 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 1147 if ((cmd == 0) && stats) 1148 logxfer(name, byte_count, start); 1149 (void) fclose(dout); 1150 data = -1; 1151done: 1152 if (pdata >= 0) 1153 (void) close(pdata); 1154 pdata = -1; 1155 if (cmd == 0) 1156 LOGBYTES("get", name, byte_count); 1157 (*closefunc)(fin); 1158} 1159 1160void 1161store(name, mode, unique) 1162 char *name, *mode; 1163 int unique; 1164{ 1165 FILE *fout, *din; 1166 int (*closefunc) __P((FILE *)); 1167 struct stat st; 1168 int fd; 1169 1170 if (restart_point && *mode != 'a') 1171 mode = "r+"; 1172 1173 if (unique && stat(name, &st) == 0) { 1174 char *nam; 1175 1176 fd = guniquefd(name, &nam); 1177 if (fd == -1) { 1178 LOGCMD(*mode == 'w' ? "put" : "append", name); 1179 return; 1180 } 1181 name = nam; 1182 fout = fdopen(fd, mode); 1183 } else 1184 fout = fopen(name, mode); 1185 1186 closefunc = fclose; 1187 if (fout == NULL) { 1188 perror_reply(553, name); 1189 LOGCMD(*mode == 'w' ? "put" : "append", name); 1190 return; 1191 } 1192 byte_count = -1; 1193 if (restart_point) { 1194 if (type == TYPE_A) { 1195 off_t i, n; 1196 int c; 1197 1198 n = restart_point; 1199 i = 0; 1200 while (i++ < n) { 1201 if ((c=getc(fout)) == EOF) { 1202 perror_reply(550, name); 1203 goto done; 1204 } 1205 if (c == '\n') 1206 i++; 1207 } 1208 /* 1209 * We must do this seek to "current" position 1210 * because we are changing from reading to 1211 * writing. 1212 */ 1213 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1214 perror_reply(550, name); 1215 goto done; 1216 } 1217 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1218 perror_reply(550, name); 1219 goto done; 1220 } 1221 } 1222 din = dataconn(name, (off_t)-1, "r"); 1223 if (din == NULL) 1224 goto done; 1225 if (receive_data(din, fout) == 0) { 1226 if (unique) 1227 reply(226, "Transfer complete (unique file name:%s).", 1228 name); 1229 else 1230 reply(226, "Transfer complete."); 1231 } 1232 (void) fclose(din); 1233 data = -1; 1234 pdata = -1; 1235done: 1236 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1237 (*closefunc)(fout); 1238} 1239 1240static FILE * 1241getdatasock(mode) 1242 char *mode; 1243{ 1244 int on = 1, s, t, tries; 1245 sigset_t allsigs; 1246 1247 if (data >= 0) 1248 return (fdopen(data, mode)); 1249 sigfillset(&allsigs); 1250 sigprocmask (SIG_BLOCK, &allsigs, NULL); 1251 (void) seteuid((uid_t)0); 1252 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1253 if (s < 0) 1254 goto bad; 1255 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1256 (char *) &on, sizeof(on)) < 0) 1257 goto bad; 1258 /* anchor socket to avoid multi-homing problems */ 1259 data_source = ctrl_addr; 1260 data_source.su_port = htons(20); /* ftp-data port */ 1261 for (tries = 1; ; tries++) { 1262 if (bind(s, (struct sockaddr *)&data_source, 1263 data_source.su_len) >= 0) 1264 break; 1265 if (errno != EADDRINUSE || tries > 10) 1266 goto bad; 1267 sleep(tries); 1268 } 1269 (void) seteuid((uid_t)pw->pw_uid); 1270 sigfillset(&allsigs); 1271 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1272 1273#ifdef IP_TOS 1274 if (ctrl_addr.su_family == AF_INET) { 1275 on = IPTOS_THROUGHPUT; 1276 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1277 sizeof(int)) < 0) 1278 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1279 } 1280#endif 1281#ifdef TCP_NOPUSH 1282 /* 1283 * Turn off push flag to keep sender TCP from sending short packets 1284 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1285 * to set the send buffer size as well, but that may not be desirable 1286 * in heavy-load situations. 1287 */ 1288 on = 1; 1289 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof on) < 0) 1290 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1291#endif 1292#ifdef SO_SNDBUF 1293 on = 65536; 1294 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof on) < 0) 1295 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1296#endif 1297 1298 return (fdopen(s, mode)); 1299bad: 1300 /* Return the real value of errno (close may change it) */ 1301 t = errno; 1302 (void) seteuid((uid_t)pw->pw_uid); 1303 sigfillset (&allsigs); 1304 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1305 (void) close(s); 1306 errno = t; 1307 return (NULL); 1308} 1309 1310static FILE * 1311dataconn(name, size, mode) 1312 char *name; 1313 off_t size; 1314 char *mode; 1315{ 1316 char sizebuf[32]; 1317 FILE *file; 1318 int retry = 0; 1319 in_port_t *p; 1320 char *fa, *ha; 1321 int alen; 1322 1323 file_size = size; 1324 byte_count = 0; 1325 if (size != (off_t) -1) { 1326 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1327 size); 1328 } else 1329 sizebuf[0] = '\0'; 1330 if (pdata >= 0) { 1331 union sockunion from; 1332 int s, fromlen = sizeof(from); 1333 1334 signal (SIGALRM, toolong); 1335 (void) alarm ((unsigned) timeout); 1336 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1337 (void) alarm (0); 1338 if (s < 0) { 1339 reply(425, "Can't open data connection."); 1340 (void) close(pdata); 1341 pdata = -1; 1342 return (NULL); 1343 } 1344 switch (from.su_family) { 1345 case AF_INET: 1346 p = (in_port_t *)&from.su_sin.sin_port; 1347 fa = (u_char *)&from.su_sin.sin_addr; 1348 ha = (u_char *)&his_addr.su_sin.sin_addr; 1349 alen = sizeof(struct in_addr); 1350 break; 1351 case AF_INET6: 1352 p = (in_port_t *)&from.su_sin6.sin6_port; 1353 fa = (u_char *)&from.su_sin6.sin6_addr; 1354 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1355 alen = sizeof(struct in6_addr); 1356 break; 1357 default: 1358 perror_reply(425, "Can't build data connection"); 1359 (void) close(pdata); 1360 (void) close(s); 1361 pdata = -1; 1362 return (NULL); 1363 } 1364 if (from.su_family != his_addr.su_family || 1365 ntohs(*p) < IPPORT_RESERVED) { 1366 perror_reply(425, "Can't build data connection"); 1367 (void) close(pdata); 1368 (void) close(s); 1369 pdata = -1; 1370 return (NULL); 1371 } 1372 if (portcheck && memcmp(fa, ha, alen) != 0) { 1373 perror_reply(435, "Can't build data connection"); 1374 (void) close(pdata); 1375 (void) close(s); 1376 pdata = -1; 1377 return (NULL); 1378 } 1379 (void) close(pdata); 1380 pdata = s; 1381 reply(150, "Opening %s mode data connection for '%s'%s.", 1382 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1383 return (fdopen(pdata, mode)); 1384 } 1385 if (data >= 0) { 1386 reply(125, "Using existing data connection for '%s'%s.", 1387 name, sizebuf); 1388 usedefault = 1; 1389 return (fdopen(data, mode)); 1390 } 1391 if (usedefault) 1392 data_dest = his_addr; 1393 usedefault = 1; 1394 file = getdatasock(mode); 1395 if (file == NULL) { 1396 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1397 1398 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1399 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1400 NI_NUMERICHOST | NI_NUMERICSERV); 1401 reply(425, "Can't create data socket (%s,%s): %s.", 1402 hbuf, pbuf, strerror(errno)); 1403 return (NULL); 1404 } 1405 data = fileno(file); 1406 1407 /* 1408 * attempt to connect to reserved port on client machine; 1409 * this looks like an attack 1410 */ 1411 switch (data_dest.su_family) { 1412 case AF_INET: 1413 p = (in_port_t *)&data_dest.su_sin.sin_port; 1414 fa = (u_char *)&data_dest.su_sin.sin_addr; 1415 ha = (u_char *)&his_addr.su_sin.sin_addr; 1416 alen = sizeof(struct in_addr); 1417 break; 1418 case AF_INET6: 1419 p = (in_port_t *)&data_dest.su_sin6.sin6_port; 1420 fa = (u_char *)&data_dest.su_sin6.sin6_addr; 1421 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1422 alen = sizeof(struct in6_addr); 1423 break; 1424 default: 1425 perror_reply(425, "Can't build data connection"); 1426 (void) fclose(file); 1427 pdata = -1; 1428 return (NULL); 1429 } 1430 if (data_dest.su_family != his_addr.su_family || 1431 ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */ 1432 perror_reply(425, "Can't build data connection"); 1433 (void) fclose(file); 1434 data = -1; 1435 return NULL; 1436 } 1437 if (portcheck && memcmp(fa, ha, alen) != 0) { 1438 perror_reply(435, "Can't build data connection"); 1439 (void) fclose(file); 1440 data = -1; 1441 return NULL; 1442 } 1443 while (connect(data, (struct sockaddr *)&data_dest, 1444 data_dest.su_len) < 0) { 1445 if (errno == EADDRINUSE && retry < swaitmax) { 1446 sleep((unsigned) swaitint); 1447 retry += swaitint; 1448 continue; 1449 } 1450 perror_reply(425, "Can't build data connection"); 1451 (void) fclose(file); 1452 data = -1; 1453 return (NULL); 1454 } 1455 reply(150, "Opening %s mode data connection for '%s'%s.", 1456 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1457 return (file); 1458} 1459 1460/* 1461 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1462 * encapsulation of the data subject to Mode, Structure, and Type. 1463 * 1464 * NB: Form isn't handled. 1465 */ 1466static void 1467send_data(instr, outstr, blksize, filesize, isreg) 1468 FILE *instr, *outstr; 1469 off_t blksize; 1470 off_t filesize; 1471 int isreg; 1472{ 1473 int c, cnt, filefd, netfd; 1474 char *buf, *bp; 1475 size_t len; 1476 1477 transflag++; 1478 if (setjmp(urgcatch)) { 1479 transflag = 0; 1480 return; 1481 } 1482 switch (type) { 1483 1484 case TYPE_A: 1485 while ((c = getc(instr)) != EOF) { 1486 byte_count++; 1487 if (c == '\n') { 1488 if (ferror(outstr)) 1489 goto data_err; 1490 (void) putc('\r', outstr); 1491 } 1492 (void) putc(c, outstr); 1493 } 1494 fflush(outstr); 1495 transflag = 0; 1496 if (ferror(instr)) 1497 goto file_err; 1498 if (ferror(outstr)) 1499 goto data_err; 1500 reply(226, "Transfer complete."); 1501 return; 1502 1503 case TYPE_I: 1504 case TYPE_L: 1505 /* 1506 * isreg is only set if we are not doing restart and we 1507 * are sending a regular file 1508 */ 1509 netfd = fileno(outstr); 1510 filefd = fileno(instr); 1511 1512 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1513 buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd, 1514 (off_t)0); 1515 if (!buf) { 1516 syslog(LOG_WARNING, "mmap(%lu): %m", 1517 (unsigned long)filesize); 1518 goto oldway; 1519 } 1520 bp = buf; 1521 len = filesize; 1522 do { 1523 cnt = write(netfd, bp, len); 1524 len -= cnt; 1525 bp += cnt; 1526 if (cnt > 0) byte_count += cnt; 1527 } while(cnt > 0 && len > 0); 1528 1529 transflag = 0; 1530 munmap(buf, (size_t)filesize); 1531 if (cnt < 0) 1532 goto data_err; 1533 reply(226, "Transfer complete."); 1534 return; 1535 } 1536 1537oldway: 1538 if ((buf = malloc((u_int)blksize)) == NULL) { 1539 transflag = 0; 1540 perror_reply(451, "Local resource failure: malloc"); 1541 return; 1542 } 1543 1544 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1545 write(netfd, buf, cnt) == cnt) 1546 byte_count += cnt; 1547 transflag = 0; 1548 (void)free(buf); 1549 if (cnt != 0) { 1550 if (cnt < 0) 1551 goto file_err; 1552 goto data_err; 1553 } 1554 reply(226, "Transfer complete."); 1555 return; 1556 default: 1557 transflag = 0; 1558 reply(550, "Unimplemented TYPE %d in send_data", type); 1559 return; 1560 } 1561 1562data_err: 1563 transflag = 0; 1564 perror_reply(426, "Data connection"); 1565 return; 1566 1567file_err: 1568 transflag = 0; 1569 perror_reply(551, "Error on input file"); 1570} 1571 1572/* 1573 * Transfer data from peer to "outstr" using the appropriate encapulation of 1574 * the data subject to Mode, Structure, and Type. 1575 * 1576 * N.B.: Form isn't handled. 1577 */ 1578static int 1579receive_data(instr, outstr) 1580 FILE *instr, *outstr; 1581{ 1582 int c; 1583 int cnt, bare_lfs = 0; 1584 char buf[BUFSIZ]; 1585 1586 transflag++; 1587 if (setjmp(urgcatch)) { 1588 transflag = 0; 1589 return (-1); 1590 } 1591 switch (type) { 1592 1593 case TYPE_I: 1594 case TYPE_L: 1595 signal (SIGALRM, lostconn); 1596 1597 do { 1598 (void) alarm ((unsigned) timeout); 1599 cnt = read(fileno(instr), buf, sizeof(buf)); 1600 (void) alarm (0); 1601 1602 if (cnt > 0) { 1603 if (write(fileno(outstr), buf, cnt) != cnt) 1604 goto file_err; 1605 byte_count += cnt; 1606 } 1607 } while (cnt > 0); 1608 if (cnt < 0) 1609 goto data_err; 1610 transflag = 0; 1611 return (0); 1612 1613 case TYPE_E: 1614 reply(553, "TYPE E not implemented."); 1615 transflag = 0; 1616 return (-1); 1617 1618 case TYPE_A: 1619 while ((c = getc(instr)) != EOF) { 1620 byte_count++; 1621 if (c == '\n') 1622 bare_lfs++; 1623 while (c == '\r') { 1624 if (ferror(outstr)) 1625 goto data_err; 1626 if ((c = getc(instr)) != '\n') { 1627 (void) putc ('\r', outstr); 1628 if (c == '\0' || c == EOF) 1629 goto contin2; 1630 } 1631 } 1632 (void) putc(c, outstr); 1633 contin2: ; 1634 } 1635 fflush(outstr); 1636 if (ferror(instr)) 1637 goto data_err; 1638 if (ferror(outstr)) 1639 goto file_err; 1640 transflag = 0; 1641 if (bare_lfs) { 1642 lreply(226, 1643 "WARNING! %d bare linefeeds received in ASCII mode", 1644 bare_lfs); 1645 printf(" File may not have transferred correctly.\r\n"); 1646 } 1647 return (0); 1648 default: 1649 reply(550, "Unimplemented TYPE %d in receive_data", type); 1650 transflag = 0; 1651 return (-1); 1652 } 1653 1654data_err: 1655 transflag = 0; 1656 perror_reply(426, "Data Connection"); 1657 return (-1); 1658 1659file_err: 1660 transflag = 0; 1661 perror_reply(452, "Error writing file"); 1662 return (-1); 1663} 1664 1665void 1666statfilecmd(filename) 1667 char *filename; 1668{ 1669 FILE *fin; 1670 int c; 1671 int atstart; 1672 char line[LINE_MAX]; 1673 1674 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1675 fin = ftpd_popen(line, "r"); 1676 lreply(211, "status of %s:", filename); 1677 atstart = 1; 1678 while ((c = getc(fin)) != EOF) { 1679 if (c == '\n') { 1680 if (ferror(stdout)){ 1681 perror_reply(421, "control connection"); 1682 (void) ftpd_pclose(fin); 1683 dologout(1); 1684 /* NOTREACHED */ 1685 } 1686 if (ferror(fin)) { 1687 perror_reply(551, filename); 1688 (void) ftpd_pclose(fin); 1689 return; 1690 } 1691 (void) putc('\r', stdout); 1692 } 1693 if (atstart && isdigit(c)) 1694 (void) putc(' ', stdout); 1695 (void) putc(c, stdout); 1696 atstart = (c == '\n'); 1697 } 1698 (void) ftpd_pclose(fin); 1699 reply(211, "End of Status"); 1700} 1701 1702void 1703statcmd() 1704{ 1705 union sockunion *su; 1706 u_char *a, *p; 1707 char hbuf[MAXHOSTNAMELEN]; 1708 int ispassive; 1709 1710 lreply(211, "%s FTP server status:", hostname, version); 1711 printf(" %s\r\n", version); 1712 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1713 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST); 1714 printf(" Connected to %s", remotehost); 1715 if (strcmp(remotehost, hbuf) != 0) 1716 printf(" (%s)", hbuf); 1717 printf("\r\n"); 1718 if (logged_in) { 1719 if (guest) 1720 printf(" Logged in anonymously\r\n"); 1721 else 1722 printf(" Logged in as %s\r\n", pw->pw_name); 1723 } else if (askpasswd) 1724 printf(" Waiting for password\r\n"); 1725 else 1726 printf(" Waiting for user name\r\n"); 1727 printf(" TYPE: %s", typenames[type]); 1728 if (type == TYPE_A || type == TYPE_E) 1729 printf(", FORM: %s", formnames[form]); 1730 if (type == TYPE_L) 1731#if NBBY == 8 1732 printf(" %d", NBBY); 1733#else 1734 printf(" %d", bytesize); /* need definition! */ 1735#endif 1736 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1737 strunames[stru], modenames[mode]); 1738 ispassive = 0; 1739 if (data != -1) 1740 printf(" Data connection open\r\n"); 1741 else if (pdata != -1) { 1742 printf(" in Passive mode\r\n"); 1743 su = (union sockunion *)&pasv_addr; 1744 ispassive++; 1745 goto printaddr; 1746 } else if (usedefault == 0) { 1747 su = (union sockunion *)&data_dest; 1748printaddr: 1749 /* PASV/PORT */ 1750 if (su->su_family == AF_INET) { 1751 if (ispassive) 1752 printf("211- PASV "); 1753 else 1754 printf("211- PORT "); 1755 a = (u_char *) &su->su_sin.sin_addr; 1756 p = (u_char *) &su->su_sin.sin_port; 1757 printf("(%u,%u,%u,%u,%u,%u)\r\n", 1758 a[0], a[1], a[2], a[3], 1759 p[0], p[1]); 1760 } 1761 1762 /* LPSV/LPRT */ 1763 { 1764 int alen, af, i; 1765 1766 alen = 0; 1767 switch (su->su_family) { 1768 case AF_INET: 1769 a = (u_char *) &su->su_sin.sin_addr; 1770 p = (u_char *) &su->su_sin.sin_port; 1771 alen = sizeof(su->su_sin.sin_addr); 1772 af = 4; 1773 break; 1774 case AF_INET6: 1775 a = (u_char *) &su->su_sin6.sin6_addr; 1776 p = (u_char *) &su->su_sin6.sin6_port; 1777 alen = sizeof(su->su_sin6.sin6_addr); 1778 af = 6; 1779 break; 1780 default: 1781 af = 0; 1782 break; 1783 } 1784 if (af) { 1785 if (ispassive) 1786 printf("211- LPSV "); 1787 else 1788 printf("211- LPRT "); 1789 printf("(%u,%u", af, alen); 1790 for (i = 0; i < alen; i++) 1791 printf(",%u", a[i]); 1792 printf(",%u,%u,%u)\r\n", 2, p[0], p[1]); 1793 } 1794 } 1795 1796 /* EPRT/EPSV */ 1797epsvonly: 1798 { 1799 u_char af; 1800 1801 switch (su->su_family) { 1802 case AF_INET: 1803 af = 1; 1804 break; 1805 case AF_INET6: 1806 af = 2; 1807 break; 1808 default: 1809 af = 0; 1810 break; 1811 } 1812 if (af) { 1813 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1814 if (getnameinfo((struct sockaddr *)su, su->su_len, 1815 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1816 NI_NUMERICHOST) == 0) { 1817 if (ispassive) 1818 printf("211- EPSV "); 1819 else 1820 printf("211- EPRT "); 1821 printf("(|%u|%s|%s|)\r\n", 1822 af, hbuf, pbuf); 1823 } 1824 } 1825 } 1826 } else 1827 printf(" No data connection\r\n"); 1828 reply(211, "End of status"); 1829} 1830 1831void 1832fatal(s) 1833 char *s; 1834{ 1835 1836 reply(451, "Error in server: %s\n", s); 1837 reply(221, "Closing connection due to server error."); 1838 dologout(0); 1839 /* NOTREACHED */ 1840} 1841 1842void 1843#ifdef __STDC__ 1844reply(int n, const char *fmt, ...) 1845#else 1846reply(n, fmt, va_alist) 1847 int n; 1848 char *fmt; 1849 va_dcl 1850#endif 1851{ 1852 va_list ap; 1853#ifdef __STDC__ 1854 va_start(ap, fmt); 1855#else 1856 va_start(ap); 1857#endif 1858 (void)printf("%d ", n); 1859 (void)vprintf(fmt, ap); 1860 (void)printf("\r\n"); 1861 (void)fflush(stdout); 1862 if (debug) { 1863 syslog(LOG_DEBUG, "<--- %d ", n); 1864 vsyslog(LOG_DEBUG, fmt, ap); 1865 } 1866} 1867 1868void 1869#ifdef __STDC__ 1870lreply(int n, const char *fmt, ...) 1871#else 1872lreply(n, fmt, va_alist) 1873 int n; 1874 char *fmt; 1875 va_dcl 1876#endif 1877{ 1878 va_list ap; 1879#ifdef __STDC__ 1880 va_start(ap, fmt); 1881#else 1882 va_start(ap); 1883#endif 1884 (void)printf("%d- ", n); 1885 (void)vprintf(fmt, ap); 1886 (void)printf("\r\n"); 1887 (void)fflush(stdout); 1888 if (debug) { 1889 syslog(LOG_DEBUG, "<--- %d- ", n); 1890 vsyslog(LOG_DEBUG, fmt, ap); 1891 } 1892} 1893 1894static void 1895ack(s) 1896 char *s; 1897{ 1898 1899 reply(250, "%s command successful.", s); 1900} 1901 1902void 1903nack(s) 1904 char *s; 1905{ 1906 1907 reply(502, "%s command not implemented.", s); 1908} 1909 1910/* ARGSUSED */ 1911void 1912yyerror(s) 1913 char *s; 1914{ 1915 char *cp; 1916 1917 if ((cp = strchr(cbuf,'\n'))) 1918 *cp = '\0'; 1919 reply(500, "'%s': command not understood.", cbuf); 1920} 1921 1922void 1923delete(name) 1924 char *name; 1925{ 1926 struct stat st; 1927 1928 LOGCMD("delete", name); 1929 if (stat(name, &st) < 0) { 1930 perror_reply(550, name); 1931 return; 1932 } 1933 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1934 if (rmdir(name) < 0) { 1935 perror_reply(550, name); 1936 return; 1937 } 1938 goto done; 1939 } 1940 if (unlink(name) < 0) { 1941 perror_reply(550, name); 1942 return; 1943 } 1944done: 1945 ack("DELE"); 1946} 1947 1948void 1949cwd(path) 1950 char *path; 1951{ 1952 FILE *message; 1953 1954 if (chdir(path) < 0) 1955 perror_reply(550, path); 1956 else { 1957 if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) { 1958 char *cp, line[LINE_MAX]; 1959 1960 while (fgets(line, sizeof(line), message) != NULL) { 1961 if ((cp = strchr(line, '\n')) != NULL) 1962 *cp = '\0'; 1963 lreply(250, "%s", line); 1964 } 1965 (void) fflush(stdout); 1966 (void) fclose(message); 1967 } 1968 ack("CWD"); 1969 } 1970} 1971 1972void 1973replydirname(name, message) 1974 const char *name, *message; 1975{ 1976 char *p, *ep; 1977 char npath[MAXPATHLEN]; 1978 1979 p = npath; 1980 ep = &npath[sizeof(npath) - 1]; 1981 while (*name) { 1982 if (*name == '"') { 1983 if (ep - p < 2) 1984 break; 1985 *p++ = *name++; 1986 *p++ = '"'; 1987 } else { 1988 if (ep - p < 1) 1989 break; 1990 *p++ = *name++; 1991 } 1992 } 1993 *p = '\0'; 1994 reply(257, "\"%s\" %s", npath, message); 1995} 1996 1997void 1998makedir(name) 1999 char *name; 2000{ 2001 2002 LOGCMD("mkdir", name); 2003 if (mkdir(name, 0777) < 0) 2004 perror_reply(550, name); 2005 else 2006 replydirname(name, "directory created."); 2007} 2008 2009void 2010removedir(name) 2011 char *name; 2012{ 2013 2014 LOGCMD("rmdir", name); 2015 if (rmdir(name) < 0) 2016 perror_reply(550, name); 2017 else 2018 ack("RMD"); 2019} 2020 2021void 2022pwd() 2023{ 2024 char path[MAXPATHLEN]; 2025 2026 if (getcwd(path, sizeof path) == (char *)NULL) 2027 reply(550, "Can't get current directory: %s.", strerror(errno)); 2028 else 2029 replydirname(path, "is current directory."); 2030} 2031 2032char * 2033renamefrom(name) 2034 char *name; 2035{ 2036 struct stat st; 2037 2038 if (stat(name, &st) < 0) { 2039 perror_reply(550, name); 2040 return ((char *)0); 2041 } 2042 reply(350, "File exists, ready for destination name"); 2043 return (name); 2044} 2045 2046void 2047renamecmd(from, to) 2048 char *from, *to; 2049{ 2050 2051 LOGCMD2("rename", from, to); 2052 if (rename(from, to) < 0) 2053 perror_reply(550, "rename"); 2054 else 2055 ack("RNTO"); 2056} 2057 2058static void 2059dolog(sa) 2060 struct sockaddr *sa; 2061{ 2062 char hbuf[sizeof(remotehost)]; 2063 2064 getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0); 2065 (void) strncpy(remotehost, hbuf, sizeof(remotehost)-1); 2066 2067 remotehost[sizeof(remotehost)-1] = '\0'; 2068#ifdef HASSETPROCTITLE 2069 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2070 setproctitle("%s", proctitle); 2071#endif /* HASSETPROCTITLE */ 2072 2073 if (logging) 2074 syslog(LOG_INFO, "connection from %s", remotehost); 2075} 2076 2077/* 2078 * Record logout in wtmp file 2079 * and exit with supplied status. 2080 */ 2081void 2082dologout(status) 2083 int status; 2084{ 2085 sigset_t allsigs; 2086 2087 transflag = 0; 2088 2089 if (logged_in) { 2090 sigfillset(&allsigs); 2091 sigprocmask(SIG_BLOCK, &allsigs, NULL); 2092 (void) seteuid((uid_t)0); 2093 ftpdlogwtmp(ttyline, "", ""); 2094 if (doutmp) 2095 logout(utmp.ut_line); 2096#if defined(KERBEROS) 2097 if (!notickets && krbtkfile_env) 2098 unlink(krbtkfile_env); 2099#endif 2100 } 2101 /* beware of flushing buffers after a SIGPIPE */ 2102 _exit(status); 2103} 2104 2105static void 2106myoob(signo) 2107 int signo; 2108{ 2109 char *cp; 2110 int save_errno = errno; 2111 2112 /* only process if transfer occurring */ 2113 if (!transflag) 2114 return; 2115 cp = tmpline; 2116 if (getline(cp, 7, stdin) == NULL) { 2117 reply(221, "You could at least say goodbye."); 2118 dologout(0); 2119 } 2120 upper(cp); 2121 if (strcmp(cp, "ABOR\r\n") == 0) { 2122 tmpline[0] = '\0'; 2123 reply(426, "Transfer aborted. Data connection closed."); 2124 reply(226, "Abort successful"); 2125 longjmp(urgcatch, 1); 2126 } 2127 if (strcmp(cp, "STAT\r\n") == 0) { 2128 tmpline[0] = '\0'; 2129 if (file_size != (off_t) -1) 2130 reply(213, "Status: %qd of %qd bytes transferred", 2131 byte_count, file_size); 2132 else 2133 reply(213, "Status: %qd bytes transferred", byte_count); 2134 } 2135 errno = save_errno; 2136} 2137 2138/* 2139 * Note: a response of 425 is not mentioned as a possible response to 2140 * the PASV command in RFC959. However, it has been blessed as 2141 * a legitimate response by Jon Postel in a telephone conversation 2142 * with Rick Adams on 25 Jan 89. 2143 */ 2144void 2145passive() 2146{ 2147 int len, on; 2148 u_char *p, *a; 2149 2150 if (pw == NULL) { 2151 reply(530, "Please login with USER and PASS"); 2152 return; 2153 } 2154 if (pdata >= 0) 2155 close(pdata); 2156 /* 2157 * XXX 2158 * At this point, it would be nice to have an algorithm that 2159 * inserted a growing delay in an attack scenario. Such a thing 2160 * would look like continual passive sockets being opened, but 2161 * nothing serious being done with them. They're not used to 2162 * move data; the entire attempt is just to use tcp FIN_WAIT 2163 * resources. 2164 */ 2165 pdata = socket(AF_INET, SOCK_STREAM, 0); 2166 if (pdata < 0) { 2167 perror_reply(425, "Can't open passive connection"); 2168 return; 2169 } 2170 2171#ifdef IP_PORTRANGE 2172 on = high_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; 2173 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2174 (char *)&on, sizeof(on)) < 0) 2175 goto pasv_error; 2176#endif 2177 2178 pasv_addr = ctrl_addr; 2179 pasv_addr.su_sin.sin_port = 0; 2180 if (bind(pdata, (struct sockaddr *)&pasv_addr, 2181 pasv_addr.su_len) < 0) 2182 goto pasv_error; 2183 2184 len = sizeof(pasv_addr); 2185 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2186 goto pasv_error; 2187 if (listen(pdata, 1) < 0) 2188 goto pasv_error; 2189 a = (u_char *) &pasv_addr.su_sin.sin_addr; 2190 p = (u_char *) &pasv_addr.su_sin.sin_port; 2191 2192 reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0], 2193 a[1], a[2], a[3], p[0], p[1]); 2194 return; 2195 2196pasv_error: 2197 (void) seteuid((uid_t)pw->pw_uid); 2198 (void) close(pdata); 2199 pdata = -1; 2200 perror_reply(425, "Can't open passive connection"); 2201 return; 2202} 2203 2204/* 2205 * convert protocol identifier to/from AF 2206 */ 2207int 2208lpsvproto2af(int proto) 2209{ 2210 2211 switch (proto) { 2212 case 4: return AF_INET; 2213#ifdef INET6 2214 case 6: return AF_INET6; 2215#endif 2216 default: return -1; 2217 } 2218} 2219 2220int 2221af2lpsvproto(int af) 2222{ 2223 2224 switch (af) { 2225 case AF_INET: return 4; 2226#ifdef INET6 2227 case AF_INET6: return 6; 2228#endif 2229 default: return -1; 2230 } 2231} 2232 2233int 2234epsvproto2af(int proto) 2235{ 2236 2237 switch (proto) { 2238 case 1: return AF_INET; 2239#ifdef INET6 2240 case 2: return AF_INET6; 2241#endif 2242 default: return -1; 2243 } 2244} 2245 2246int 2247af2epsvproto(int af) 2248{ 2249 2250 switch (af) { 2251 case AF_INET: return 1; 2252#ifdef INET6 2253 case AF_INET6: return 2; 2254#endif 2255 default: return -1; 2256 } 2257} 2258 2259/* 2260 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2261 * 229 Entering Extended Passive Mode (|||port|) 2262 */ 2263void 2264long_passive(char *cmd, int pf) 2265{ 2266 int len, on; 2267 register u_char *p, *a; 2268 2269 if (!logged_in) { 2270 syslog(LOG_NOTICE, "long passive but not logged in"); 2271 reply(503, "Login with USER first."); 2272 return; 2273 } 2274 2275 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2276 /* 2277 * XXX 2278 * only EPRT/EPSV ready clients will understand this 2279 */ 2280 if (strcmp(cmd, "EPSV") != 0) 2281 reply(501, "Network protocol mismatch"); /*XXX*/ 2282 else 2283 epsv_protounsupp("Network protocol mismatch"); 2284 2285 return; 2286 } 2287 2288 if (pdata >= 0) 2289 close(pdata); 2290 /* 2291 * XXX 2292 * At this point, it would be nice to have an algorithm that 2293 * inserted a growing delay in an attack scenario. Such a thing 2294 * would look like continual passive sockets being opened, but 2295 * nothing serious being done with them. They not used to move 2296 * data; the entire attempt is just to use tcp FIN_WAIT 2297 * resources. 2298 */ 2299 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2300 if (pdata < 0) { 2301 perror_reply(425, "Can't open passive connection"); 2302 return; 2303 } 2304 2305 switch (ctrl_addr.su_family) { 2306 case AF_INET: 2307#ifdef IP_PORTRANGE 2308 on = high_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; 2309 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2310 (char *)&on, sizeof(on)) < 0) 2311 goto pasv_error; 2312#endif 2313 break; 2314 case AF_INET6: 2315#ifdef IPV6_PORTRANGE 2316 on = high_data_ports ? IPV6_PORTRANGE_HIGH 2317 : IPV6_PORTRANGE_DEFAULT; 2318 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2319 (char *)&on, sizeof(on)) < 0) 2320 goto pasv_error; 2321#endif 2322 break; 2323 } 2324 2325 pasv_addr = ctrl_addr; 2326 pasv_addr.su_port = 0; 2327 (void) seteuid((uid_t) 0); 2328 if (bind(pdata, (struct sockaddr *) &pasv_addr, pasv_addr.su_len) < 0) { 2329 (void) seteuid((uid_t) pw->pw_uid); 2330 goto pasv_error; 2331 } 2332 (void) seteuid((uid_t) pw->pw_uid); 2333 len = pasv_addr.su_len; 2334 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2335 goto pasv_error; 2336 if (listen(pdata, 1) < 0) 2337 goto pasv_error; 2338 p = (u_char *) &pasv_addr.su_port; 2339 2340 if (strcmp(cmd, "LPSV") == 0) { 2341 switch (pasv_addr.su_family) { 2342 case AF_INET: 2343 a = (u_char *) &pasv_addr.su_sin.sin_addr; 2344 reply(228, 2345 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2346 4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]); 2347 return; 2348 case AF_INET6: 2349 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2350 reply(228, 2351 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u," 2352 "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2353 6, 16, a[0], a[1], a[2], a[3], a[4], 2354 a[5], a[6], a[7], a[8], a[9], a[10], 2355 a[11], a[12], a[13], a[14], a[15], 2356 2, p[0], p[1]); 2357 return; 2358 } 2359 } else if (strcmp(cmd, "EPSV") == 0) { 2360 switch (pasv_addr.su_family) { 2361 case AF_INET: 2362 case AF_INET6: 2363 reply(229, "Entering Extended Passive Mode (|||%u|)", 2364 ntohs(pasv_addr.su_port)); 2365 return; 2366 } 2367 } else { 2368 /* more proper error code? */ 2369 } 2370 2371 pasv_error: 2372 (void) close(pdata); 2373 pdata = -1; 2374 perror_reply(425, "Can't open passive connection"); 2375 return; 2376} 2377 2378/* 2379 * EPRT |proto|addr|port| 2380 */ 2381int 2382extended_port(const char *arg) 2383{ 2384 char *tmp = NULL; 2385 char *result[3]; 2386 char *p, *q; 2387 char delim; 2388 struct addrinfo hints; 2389 struct addrinfo *res = NULL; 2390 int i; 2391 unsigned long proto; 2392 2393 if (epsvall) { 2394 reply(501, "EPRT disallowed after EPSV ALL"); 2395 return -1; 2396 } 2397 2398 usedefault = 0; 2399 if (pdata >= 0) { 2400 (void) close(pdata); 2401 pdata = -1; 2402 } 2403 2404 tmp = strdup(arg); 2405 if (!tmp) { 2406 fatal("not enough core."); 2407 /*NOTREACHED*/ 2408 } 2409 p = tmp; 2410 delim = p[0]; 2411 p++; 2412 memset(result, 0, sizeof(result)); 2413 for (i = 0; i < 3; i++) { 2414 q = strchr(p, delim); 2415 if (!q || *q != delim) 2416 goto parsefail; 2417 *q++ = '\0'; 2418 result[i] = p; 2419 p = q; 2420 } 2421 2422 /* some more sanity check */ 2423 p = NULL; 2424 (void)strtoul(result[2], &p, 10); 2425 if (!*result[2] || *p) 2426 goto protounsupp; 2427 p = NULL; 2428 proto = strtoul(result[0], &p, 10); 2429 if (!*result[0] || *p) 2430 goto protounsupp; 2431 2432 memset(&hints, 0, sizeof(hints)); 2433 hints.ai_family = epsvproto2af((int)proto); 2434 if (hints.ai_family < 0) 2435 goto protounsupp; 2436 hints.ai_socktype = SOCK_STREAM; 2437 hints.ai_flags = AI_NUMERICHOST; /*no DNS*/ 2438 if (getaddrinfo(result[1], result[2], &hints, &res)) 2439 goto parsefail; 2440 if (res->ai_next) 2441 goto parsefail; 2442 if (sizeof(data_dest) < res->ai_addrlen) 2443 goto parsefail; 2444 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2445 if (his_addr.su_family == AF_INET6 && 2446 data_dest.su_family == AF_INET6) { 2447 /* XXX more sanity checks! */ 2448 data_dest.su_sin6.sin6_scope_id = 2449 his_addr.su_sin6.sin6_scope_id; 2450 } 2451 if (pdata >= 0) { 2452 (void) close(pdata); 2453 pdata = -1; 2454 } 2455 reply(200, "EPRT command successful."); 2456 2457 if (tmp) 2458 free(tmp); 2459 if (res) 2460 freeaddrinfo(res); 2461 return 0; 2462 2463parsefail: 2464 reply(500, "Invalid argument, rejected."); 2465 usedefault = 1; 2466 if (tmp) 2467 free(tmp); 2468 if (res) 2469 freeaddrinfo(res); 2470 return -1; 2471 2472protounsupp: 2473 epsv_protounsupp("Protocol not supported"); 2474 usedefault = 1; 2475 if (tmp) 2476 free(tmp); 2477 if (res) 2478 freeaddrinfo(res); 2479 return -1; 2480} 2481 2482/* 2483 * 522 Protocol not supported (proto,...) 2484 * as we assume address family for control and data connections are the same, 2485 * we do not return the list of address families we support - instead, we 2486 * return the address family of the control connection. 2487 */ 2488void 2489epsv_protounsupp(const char *message) 2490{ 2491 int proto; 2492 2493 proto = af2epsvproto(ctrl_addr.su_family); 2494 if (proto < 0) 2495 reply(501, "%s", message); /*XXX*/ 2496 else 2497 reply(522, "%s, use (%d)", message, proto); 2498} 2499 2500/* 2501 * Generate unique name for file with basename "local". 2502 * The file named "local" is already known to exist. 2503 * Generates failure reply on error. 2504 */ 2505static int 2506guniquefd(local, nam) 2507 char *local; 2508 char **nam; 2509{ 2510 static char new[MAXPATHLEN]; 2511 struct stat st; 2512 int count, len, fd; 2513 char *cp; 2514 2515 cp = strrchr(local, '/'); 2516 if (cp) 2517 *cp = '\0'; 2518 if (stat(cp ? local : ".", &st) < 0) { 2519 perror_reply(553, cp ? local : "."); 2520 return (-1); 2521 } 2522 if (cp) 2523 *cp = '/'; 2524 (void) strncpy(new, local, sizeof(new)-1); 2525 new[sizeof(new)-1] = '\0'; 2526 len = strlen(new); 2527 if (len+2+1 >= sizeof(new)-1) 2528 return (-1); 2529 cp = new + len; 2530 *cp++ = '.'; 2531 for (count = 1; count < 100; count++) { 2532 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 2533 fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666); 2534 if (fd == -1) 2535 continue; 2536 if (nam) 2537 *nam = new; 2538 return (fd); 2539 } 2540 reply(452, "Unique file name cannot be created."); 2541 return (-1); 2542} 2543 2544/* 2545 * Format and send reply containing system error number. 2546 */ 2547void 2548perror_reply(code, string) 2549 int code; 2550 char *string; 2551{ 2552 2553 reply(code, "%s: %s.", string, strerror(errno)); 2554} 2555 2556static char *onefile[] = { 2557 "", 2558 0 2559}; 2560 2561void 2562send_file_list(whichf) 2563 char *whichf; 2564{ 2565 struct stat st; 2566 DIR *dirp = NULL; 2567 struct dirent *dir; 2568 FILE *dout = NULL; 2569 char **dirlist, *dirname; 2570 int simple = 0; 2571 int freeglob = 0; 2572 glob_t gl; 2573 2574 if (strpbrk(whichf, "~{[*?") != NULL) { 2575 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 2576 2577 memset(&gl, 0, sizeof(gl)); 2578 freeglob = 1; 2579 if (glob(whichf, flags, 0, &gl)) { 2580 reply(550, "not found"); 2581 goto out; 2582 } else if (gl.gl_pathc == 0) { 2583 errno = ENOENT; 2584 perror_reply(550, whichf); 2585 goto out; 2586 } 2587 dirlist = gl.gl_pathv; 2588 } else { 2589 onefile[0] = whichf; 2590 dirlist = onefile; 2591 simple = 1; 2592 } 2593 2594 if (setjmp(urgcatch)) { 2595 transflag = 0; 2596 goto out; 2597 } 2598 while ((dirname = *dirlist++)) { 2599 if (stat(dirname, &st) < 0) { 2600 /* 2601 * If user typed "ls -l", etc, and the client 2602 * used NLST, do what the user meant. 2603 */ 2604 if (dirname[0] == '-' && *dirlist == NULL && 2605 transflag == 0) { 2606 retrieve("/bin/ls %s", dirname); 2607 goto out; 2608 } 2609 perror_reply(550, whichf); 2610 if (dout != NULL) { 2611 (void) fclose(dout); 2612 transflag = 0; 2613 data = -1; 2614 pdata = -1; 2615 } 2616 goto out; 2617 } 2618 2619 if (S_ISREG(st.st_mode)) { 2620 if (dout == NULL) { 2621 dout = dataconn("file list", (off_t)-1, "w"); 2622 if (dout == NULL) 2623 goto out; 2624 transflag++; 2625 } 2626 fprintf(dout, "%s%s\n", dirname, 2627 type == TYPE_A ? "\r" : ""); 2628 byte_count += strlen(dirname) + 1; 2629 continue; 2630 } else if (!S_ISDIR(st.st_mode)) 2631 continue; 2632 2633 if ((dirp = opendir(dirname)) == NULL) 2634 continue; 2635 2636 while ((dir = readdir(dirp)) != NULL) { 2637 char nbuf[MAXPATHLEN]; 2638 2639 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2640 continue; 2641 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2642 dir->d_namlen == 2) 2643 continue; 2644 2645 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 2646 dir->d_name); 2647 2648 /* 2649 * We have to do a stat to insure it's 2650 * not a directory or special file. 2651 */ 2652 if (simple || (stat(nbuf, &st) == 0 && 2653 S_ISREG(st.st_mode))) { 2654 if (dout == NULL) { 2655 dout = dataconn("file list", (off_t)-1, 2656 "w"); 2657 if (dout == NULL) 2658 goto out; 2659 transflag++; 2660 } 2661 if (nbuf[0] == '.' && nbuf[1] == '/') 2662 fprintf(dout, "%s%s\n", &nbuf[2], 2663 type == TYPE_A ? "\r" : ""); 2664 else 2665 fprintf(dout, "%s%s\n", nbuf, 2666 type == TYPE_A ? "\r" : ""); 2667 byte_count += strlen(nbuf) + 1; 2668 } 2669 } 2670 (void) closedir(dirp); 2671 } 2672 2673 if (dout == NULL) 2674 reply(550, "No files found."); 2675 else if (ferror(dout) != 0) 2676 perror_reply(550, "Data connection"); 2677 else 2678 reply(226, "Transfer complete."); 2679 2680 transflag = 0; 2681 if (dout != NULL) 2682 (void) fclose(dout); 2683 else { 2684 if (pdata >= 0) 2685 close(pdata); 2686 } 2687 data = -1; 2688 pdata = -1; 2689out: 2690 if (freeglob) { 2691 freeglob = 0; 2692 globfree(&gl); 2693 } 2694} 2695 2696static void 2697reapchild(signo) 2698 int signo; 2699{ 2700 int save_errno = errno; 2701 2702 while (wait3(NULL, WNOHANG, NULL) > 0) 2703 ; 2704 errno = save_errno; 2705} 2706 2707void 2708logxfer(name, size, start) 2709 char *name; 2710 off_t size; 2711 time_t start; 2712{ 2713 char buf[400 + MAXHOSTNAMELEN*4 + MAXPATHLEN*4]; 2714 char dir[MAXPATHLEN], path[MAXPATHLEN], rpath[MAXPATHLEN]; 2715 char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; 2716 char *vpw; 2717 time_t now; 2718 2719 if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) { 2720 time(&now); 2721 2722 vpw = (char *)malloc(strlen((guest) ? guestpw : pw->pw_name)*4+1); 2723 if (vpw == NULL) 2724 return; 2725 2726 snprintf(path, sizeof path, "%s/%s", dir, name); 2727 if (realpath(path, rpath) == NULL) { 2728 strncpy(rpath, path, sizeof rpath-1); 2729 rpath[sizeof rpath-1] = '\0'; 2730 } 2731 strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH); 2732 2733 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2734 strvis(vpw, (guest) ? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2735 2736 snprintf(buf, sizeof(buf), 2737 "%.24s %d %s %qd %s %c %s %c %c %s ftp %d %s %s\n", 2738 ctime(&now), now - start + (now == start), 2739 vremotehost, (long long) size, vpath, 2740 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2741 'o', ((guest) ? 'a' : 'r'), 2742 vpw, 0 /* none yet */, 2743 ((guest) ? "*" : pw->pw_name), dhostname); 2744 write(statfd, buf, strlen(buf)); 2745 free(vpw); 2746 } 2747} 2748 2749#if defined(TCPWRAPPERS) 2750static int 2751check_host(sa) 2752 struct sockaddr *sa; 2753{ 2754 struct sockaddr_in *sin; 2755 struct hostent *hp; 2756 char *addr; 2757 2758 if (sa->sa_family != AF_INET) 2759 return 1; /*XXX*/ 2760 2761 sin = (struct sockaddr_in *)sa; 2762 hp = gethostbyaddr((char *)&sin->sin_addr, 2763 sizeof(struct in_addr), AF_INET); 2764 addr = inet_ntoa(sin->sin_addr); 2765 if (hp) { 2766 if (!hosts_ctl("ftpd", hp->h_name, addr, STRING_UNKNOWN)) { 2767 syslog(LOG_NOTICE, "tcpwrappers rejected: %s [%s]", 2768 hp->h_name, addr); 2769 return (0); 2770 } 2771 } else { 2772 if (!hosts_ctl("ftpd", STRING_UNKNOWN, addr, STRING_UNKNOWN)) { 2773 syslog(LOG_NOTICE, "tcpwrappers rejected: [%s]", addr); 2774 return (0); 2775 } 2776 } 2777 return (1); 2778} 2779#endif /* TCPWRAPPERS */ 2780 2781/* 2782 * Allocate space and return a copy of the specified dir. 2783 * If 'dir' begins with a tilde (~), expand it. 2784 */ 2785char * 2786copy_dir(dir, pw) 2787 char *dir; 2788 struct passwd *pw; 2789{ 2790 char *cp; 2791 char *newdir; 2792 char *user = NULL; 2793 size_t dirsiz; 2794 2795 /* Nothing to expand */ 2796 if (dir[0] != '~') 2797 return (strdup(dir)); 2798 2799 /* "dir" is of form ~user/some/dir, lookup user. */ 2800 if (dir[1] != '/' && dir[1] != '\0') { 2801 if ((cp = strchr(dir + 1, '/')) == NULL) 2802 cp = dir + strlen(dir); 2803 if ((user = malloc(cp - dir)) == NULL) 2804 return (NULL); 2805 strlcpy(user, dir + 1, cp - dir); 2806 2807 /* Only do lookup if it is a different user. */ 2808 if (strcmp(user, pw->pw_name) != 0) { 2809 if ((pw = getpwnam(user)) == NULL) { 2810 /* No such user, interpret literally */ 2811 free(user); 2812 return(strdup(dir)); 2813 } 2814 } 2815 } 2816 2817 /* 2818 * If there is no directory separator (/) then it is just pw_dir. 2819 * Otherwise, replace ~foo with pw_dir. 2820 */ 2821 if ((cp = strchr(dir + 1, '/')) == NULL) { 2822 newdir = strdup(pw->pw_dir); 2823 } else { 2824 dirsiz = strlen(cp) + strlen(pw->pw_dir) + 1; 2825 if ((newdir = malloc(dirsiz)) == NULL) 2826 return (NULL); 2827 strcpy(newdir, pw->pw_dir); 2828 strcat(newdir, cp); 2829 } 2830 2831 if (user) 2832 free(user); 2833 return(newdir); 2834} 2835