ftpd.c revision 1.100
1/* $OpenBSD: ftpd.c,v 1.100 2001/06/25 16:24:27 millert Exp $ */ 2/* $NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $ */ 3 4/* 5 * Copyright (C) 1997 and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* 34 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. 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[] = "$OpenBSD: ftpd.c,v 1.100 2001/06/25 16:24:27 millert 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#include <bsd_auth.h> 122 123#if defined(TCPWRAPPERS) 124#include <tcpd.h> 125#endif /* TCPWRAPPERS */ 126 127#include "pathnames.h" 128#include "extern.h" 129 130#ifdef __STDC__ 131#include <stdarg.h> 132#else 133#include <varargs.h> 134#endif 135 136static char version[] = "Version 6.5/OpenBSD"; 137 138extern off_t restart_point; 139extern char cbuf[]; 140 141union sockunion server_addr; 142union sockunion ctrl_addr; 143union sockunion data_source; 144union sockunion data_dest; 145union sockunion his_addr; 146union sockunion pasv_addr; 147 148sigset_t allsigs; 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 022 181#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 */ 192static login_cap_t *lc; 193static auth_session_t *as; 194 195#if defined(TCPWRAPPERS) 196int allow_severity = LOG_INFO; 197int deny_severity = LOG_NOTICE; 198#endif /* TCPWRAPPERS */ 199 200char *ident = NULL; 201 202 203int epsvall = 0; 204 205/* 206 * Timeout intervals for retrying connections 207 * to hosts that don't accept PORT cmds. This 208 * is a kludge, but given the problems with TCP... 209 */ 210#define SWAITMAX 90 /* wait at most 90 seconds */ 211#define SWAITINT 5 /* interval between retries */ 212 213int swaitmax = SWAITMAX; 214int swaitint = SWAITINT; 215 216#ifdef HASSETPROCTITLE 217char proctitle[BUFSIZ]; /* initial part of title */ 218#endif /* HASSETPROCTITLE */ 219 220#define LOGCMD(cmd, file) \ 221 if (logging > 1) \ 222 syslog(LOG_INFO,"%s %s%s", cmd, \ 223 *(file) == '/' ? "" : curdir(), file); 224#define LOGCMD2(cmd, file1, file2) \ 225 if (logging > 1) \ 226 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 227 *(file1) == '/' ? "" : curdir(), file1, \ 228 *(file2) == '/' ? "" : curdir(), file2); 229#define LOGBYTES(cmd, file, cnt) \ 230 if (logging > 1) { \ 231 if (cnt == (off_t)-1) \ 232 syslog(LOG_INFO,"%s %s%s", cmd, \ 233 *(file) == '/' ? "" : curdir(), file); \ 234 else \ 235 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 236 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 237 } 238 239static void ack __P((char *)); 240static void myoob __P((int)); 241static int checkuser __P((char *, char *)); 242static FILE *dataconn __P((char *, off_t, char *)); 243static void dolog __P((struct sockaddr *)); 244static char *copy_dir __P((char *, struct passwd *)); 245static char *curdir __P((void)); 246static void end_login __P((void)); 247static FILE *getdatasock __P((char *)); 248static int guniquefd __P((char *, char **)); 249static void lostconn __P((int)); 250static void sigquit __P((int)); 251static int receive_data __P((FILE *, FILE *)); 252static void replydirname __P((const char *, const char *)); 253static void send_data __P((FILE *, FILE *, off_t, off_t, int)); 254static struct passwd * 255 sgetpwnam __P((char *)); 256static void reapchild __P((int)); 257static int check_host __P((struct sockaddr *)); 258static void usage __P((void)); 259 260void logxfer __P((char *, off_t, time_t)); 261 262static char * 263curdir() 264{ 265 static char path[MAXPATHLEN+1]; /* path + '/' */ 266 267 if (getcwd(path, sizeof(path)-1) == NULL) 268 return (""); 269 if (path[1] != '\0') /* special case for root dir. */ 270 strcat(path, "/"); 271 /* For guest account, skip / since it's chrooted */ 272 return (guest ? path+1 : path); 273} 274 275char *argstr = "AdDhlMSt:T:u:UvP46"; 276 277static void 278usage() 279{ 280 syslog(LOG_ERR, 281 "usage: ftpd [-AdDhlMSUv] [-t timeout] [-T maxtimeout] [-u mask]"); 282 exit(2); 283} 284 285int 286main(argc, argv, envp) 287 int argc; 288 char *argv[]; 289 char **envp; 290{ 291 int addrlen, ch, on = 1, tos; 292 char *cp, line[LINE_MAX]; 293 FILE *fp; 294 struct hostent *hp; 295 296 tzset(); /* in case no timezone database in ~ftp */ 297 sigfillset(&allsigs); /* used to block signals while root */ 298 299 while ((ch = getopt(argc, argv, argstr)) != -1) { 300 switch (ch) { 301 case 'A': 302 anon_only = 1; 303 break; 304 305 case 'd': 306 debug = 1; 307 break; 308 309 case 'D': 310 daemon_mode = 1; 311 break; 312 313 case 'P': 314 portcheck = 0; 315 break; 316 317 case 'h': 318 high_data_ports = 1; 319 break; 320 321 case 'l': 322 logging++; /* > 1 == extra logging */ 323 break; 324 325 case 'M': 326 multihome = 1; 327 break; 328 329 case 'S': 330 stats = 1; 331 break; 332 333 case 't': 334 timeout = atoi(optarg); 335 if (maxtimeout < timeout) 336 maxtimeout = timeout; 337 break; 338 339 case 'T': 340 maxtimeout = atoi(optarg); 341 if (timeout > maxtimeout) 342 timeout = maxtimeout; 343 break; 344 345 case 'u': 346 { 347 long val = 0; 348 char *p; 349 umaskchange = 0; 350 351 val = strtol(optarg, &p, 8); 352 if (*p != '\0' || val < 0 || (val & ~ACCESSPERMS)) { 353 syslog(LOG_ERR, 354 "ftpd: %s is a bad value for -u, aborting..", 355 optarg); 356 exit(2); 357 } else 358 defumask = val; 359 break; 360 } 361 362 case 'U': 363 doutmp = 1; 364 break; 365 366 case 'v': 367 debug = 1; 368 break; 369 370 case '4': 371 family = AF_INET; 372 break; 373 374 case '6': 375 family = AF_INET6; 376 break; 377 378 default: 379 usage(); 380 break; 381 } 382 } 383 384 (void) freopen(_PATH_DEVNULL, "w", stderr); 385 386 /* 387 * LOG_NDELAY sets up the logging connection immediately, 388 * necessary for anonymous ftp's that chroot and can't do it later. 389 */ 390 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 391 392 if (daemon_mode) { 393 int ctl_sock, fd; 394 struct servent *sv; 395 396 /* 397 * Detach from parent. 398 */ 399 if (daemon(1, 1) < 0) { 400 syslog(LOG_ERR, "failed to become a daemon"); 401 exit(1); 402 } 403 (void) signal(SIGCHLD, reapchild); 404 /* 405 * Get port number for ftp/tcp. 406 */ 407 sv = getservbyname("ftp", "tcp"); 408 if (sv == NULL) { 409 syslog(LOG_ERR, "getservbyname for ftp failed"); 410 exit(1); 411 } 412 /* 413 * Open a socket, bind it to the FTP port, and start 414 * listening. 415 */ 416 ctl_sock = socket(family, SOCK_STREAM, 0); 417 if (ctl_sock < 0) { 418 syslog(LOG_ERR, "control socket: %m"); 419 exit(1); 420 } 421 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 422 (char *)&on, sizeof(on)) < 0) 423 syslog(LOG_ERR, "control setsockopt: %m"); 424 memset(&server_addr, 0, sizeof(server_addr)); 425 server_addr.su_sin.sin_family = family; 426 switch (family) { 427 case AF_INET: 428 server_addr.su_len = sizeof(struct sockaddr_in); 429 server_addr.su_sin.sin_port = sv->s_port; 430 break; 431 case AF_INET6: 432 server_addr.su_len = sizeof(struct sockaddr_in6); 433 server_addr.su_sin6.sin6_port = sv->s_port; 434 break; 435 } 436 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 437 server_addr.su_len)) { 438 syslog(LOG_ERR, "control bind: %m"); 439 exit(1); 440 } 441 if (listen(ctl_sock, 32) < 0) { 442 syslog(LOG_ERR, "control listen: %m"); 443 exit(1); 444 } 445 /* Stash pid in pidfile */ 446 if ((fp = fopen(_PATH_FTPDPID, "w")) == NULL) 447 syslog(LOG_ERR, "can't open %s: %m", _PATH_FTPDPID); 448 else { 449 fprintf(fp, "%d\n", getpid()); 450 fchmod(fileno(fp), S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); 451 fclose(fp); 452 } 453 /* 454 * Loop forever accepting connection requests and forking off 455 * children to handle them. 456 */ 457 while (1) { 458 addrlen = sizeof(his_addr); 459 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, 460 &addrlen); 461 if (fork() == 0) { 462 /* child */ 463 (void) dup2(fd, 0); 464 (void) dup2(fd, 1); 465 close(ctl_sock); 466 break; 467 } 468 close(fd); 469 } 470 471#if defined(TCPWRAPPERS) 472 /* ..in the child. */ 473 if (!check_host((struct sockaddr *)&his_addr)) 474 exit(1); 475#endif /* TCPWRAPPERS */ 476 } else { 477 addrlen = sizeof(his_addr); 478 if (getpeername(0, (struct sockaddr *)&his_addr, 479 &addrlen) < 0) { 480 /* syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); */ 481 exit(1); 482 } 483 } 484 485 /* set this here so klogin can use it... */ 486 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 487 488 (void) signal(SIGHUP, sigquit); 489 (void) signal(SIGINT, sigquit); 490 (void) signal(SIGQUIT, sigquit); 491 (void) signal(SIGTERM, sigquit); 492 (void) signal(SIGPIPE, lostconn); 493 (void) signal(SIGCHLD, SIG_IGN); 494 if (signal(SIGURG, myoob) == SIG_ERR) 495 syslog(LOG_ERR, "signal: %m"); 496 497 addrlen = sizeof(ctrl_addr); 498 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 499 syslog(LOG_ERR, "getsockname (%s): %m", argv[0]); 500 exit(1); 501 } 502 if (his_addr.su_family == AF_INET6 503 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 504#if 1 505 /* 506 * IPv4 control connection arrived to AF_INET6 socket. 507 * I hate to do this, but this is the easiest solution. 508 */ 509 union sockunion tmp_addr; 510 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 511 512 tmp_addr = his_addr; 513 memset(&his_addr, 0, sizeof(his_addr)); 514 his_addr.su_sin.sin_family = AF_INET; 515 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 516 memcpy(&his_addr.su_sin.sin_addr, 517 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 518 sizeof(his_addr.su_sin.sin_addr)); 519 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 520 521 tmp_addr = ctrl_addr; 522 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 523 ctrl_addr.su_sin.sin_family = AF_INET; 524 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 525 memcpy(&ctrl_addr.su_sin.sin_addr, 526 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 527 sizeof(ctrl_addr.su_sin.sin_addr)); 528 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 529#else 530 while (fgets(line, sizeof(line), fd) != NULL) { 531 if ((cp = strchr(line, '\n')) != NULL) 532 *cp = '\0'; 533 lreply(530, "%s", line); 534 } 535 (void) fflush(stdout); 536 (void) fclose(fd); 537 reply(530, 538 "Connection from IPv4 mapped address is not supported."); 539 exit(0); 540#endif 541 } 542#ifdef IP_TOS 543 if (his_addr.su_family == AF_INET) { 544 tos = IPTOS_LOWDELAY; 545 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 546 sizeof(int)) < 0) 547 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 548 } 549#endif 550 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 551 552 /* Try to handle urgent data inline */ 553#ifdef SO_OOBINLINE 554 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 555 syslog(LOG_ERR, "setsockopt: %m"); 556#endif 557 558#ifdef F_SETOWN 559 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 560 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 561#endif 562 dolog((struct sockaddr *)&his_addr); 563 /* 564 * Set up default state 565 */ 566 data = -1; 567 type = TYPE_A; 568 form = FORM_N; 569 stru = STRU_F; 570 mode = MODE_S; 571 tmpline[0] = '\0'; 572 573 /* If logins are disabled, print out the message. */ 574 if ((fp = fopen(_PATH_NOLOGIN, "r")) != NULL) { 575 while (fgets(line, sizeof(line), fp) != NULL) { 576 if ((cp = strchr(line, '\n')) != NULL) 577 *cp = '\0'; 578 lreply(530, "%s", line); 579 } 580 (void) fflush(stdout); 581 (void) fclose(fp); 582 reply(530, "System not available."); 583 exit(0); 584 } 585 if ((fp = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 586 while (fgets(line, sizeof(line), fp) != NULL) { 587 if ((cp = strchr(line, '\n')) != NULL) 588 *cp = '\0'; 589 lreply(220, "%s", line); 590 } 591 (void) fflush(stdout); 592 (void) fclose(fp); 593 /* reply(220,) must follow */ 594 } 595 (void) gethostname(hostname, sizeof(hostname)); 596 597 /* Make sure hostname is fully qualified. */ 598 hp = gethostbyname(hostname); 599 if (hp != NULL) 600 strcpy(hostname, hp->h_name); 601 602 if (multihome) { 603 getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 604 dhostname, sizeof(dhostname), NULL, 0, 0); 605 } 606 607 reply(220, "%s FTP server (%s) ready.", 608 (multihome ? dhostname : hostname), version); 609 (void) setjmp(errcatch); 610 for (;;) 611 (void) yyparse(); 612 /* NOTREACHED */ 613} 614 615/* 616 * Signal handlers. 617 */ 618 619static void 620lostconn(signo) 621 int signo; 622{ 623 624 sigprocmask(SIG_BLOCK, &allsigs, NULL); 625 if (debug) 626 syslog(LOG_DEBUG, "lost connection"); 627 dologout(1); 628} 629 630static void 631sigquit(signo) 632 int signo; 633{ 634 635 sigprocmask(SIG_BLOCK, &allsigs, NULL); 636 syslog(LOG_ERR, "got signal %s", sys_signame[signo]); 637 dologout(1); 638} 639 640/* 641 * Save the result of a getpwnam. Used for USER command, since 642 * the data returned must not be clobbered by any other command 643 * (e.g., globbing). 644 */ 645static struct passwd * 646sgetpwnam(name) 647 char *name; 648{ 649 static struct passwd *save; 650 struct passwd *pw; 651 652 if ((pw = getpwnam(name)) == NULL) 653 return (pw); 654 if (save) { 655 memset(save->pw_passwd, 0, strlen(save->pw_passwd)); 656 free(save); 657 } 658 save = pw_dup(pw); 659 if (save == NULL) { 660 perror_reply(421, "Local resource failure: malloc"); 661 dologout(1); 662 /* NOTREACHED */ 663 } 664 return (save); 665} 666 667static int login_attempts; /* number of failed login attempts */ 668static int askpasswd; /* had user command, ask for passwd */ 669static char curname[MAXLOGNAME]; /* current USER name */ 670 671/* 672 * USER command. 673 * Sets global passwd pointer pw if named account exists and is acceptable; 674 * sets askpasswd if a PASS command is expected. If logged in previously, 675 * need to reset state. If name is "ftp" or "anonymous", the name is not in 676 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 677 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 678 * requesting login privileges. Disallow anyone who does not have a standard 679 * shell as returned by getusershell(). Disallow anyone mentioned in the file 680 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 681 */ 682void 683user(name) 684 char *name; 685{ 686 char *cp, *shell, *style; 687 char *class = NULL; 688 689 if (logged_in) { 690 if (guest) { 691 reply(530, "Can't change user from guest login."); 692 return; 693 } else if (dochroot) { 694 reply(530, "Can't change user from chroot user."); 695 return; 696 } 697 login_close(lc); 698 lc = NULL; 699 if (as) { 700 auth_close(as); 701 as = NULL; 702 } 703 end_login(); 704 } 705 706 if ((style = strchr(name, ':')) != NULL) 707 *style++ = 0; 708 709 guest = 0; 710 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 711 if (checkuser(_PATH_FTPUSERS, "ftp") || 712 checkuser(_PATH_FTPUSERS, "anonymous")) 713 reply(530, "User %s access denied.", name); 714 else if ((pw = sgetpwnam("ftp")) != NULL) { 715 guest = 1; 716 askpasswd = 1; 717 lc = login_getclass(pw->pw_class); 718 reply(331, 719 "Guest login ok, send your email address as password."); 720 } else 721 reply(530, "User %s unknown.", name); 722 if (!askpasswd && logging) 723 syslog(LOG_NOTICE, 724 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 725 return; 726 } 727 728 shell = _PATH_BSHELL; 729 if ((pw = sgetpwnam(name))) { 730 class = pw->pw_class; 731 if (pw->pw_shell != NULL && *pw->pw_shell != '\0') 732 shell = pw->pw_shell; 733 while ((cp = getusershell()) != NULL) 734 if (strcmp(cp, shell) == 0) 735 break; 736 shell = cp; 737 endusershell(); 738 } 739 740 /* Get login class; if invalid style treat like unknown user. */ 741 lc = login_getclass(class); 742 if (lc && (style = login_getstyle(lc, style, "auth-ftp")) == NULL) { 743 login_close(lc); 744 lc = NULL; 745 pw = NULL; 746 } 747 748 /* Do pre-authentication setup. */ 749 if (lc && ((as = auth_open()) == NULL || 750 auth_setitem(as, AUTHV_STYLE, style) < 0 || 751 auth_setitem(as, AUTHV_NAME, name) < 0 || 752 auth_setitem(as, AUTHV_CLASS, class) < 0 || 753 auth_setitem(as, "login", "yes") < 0)) { 754 auth_setitem(as, "notickets", "yes") < 0)) { 755 if (as) { 756 auth_close(as); 757 as = NULL; 758 } 759 login_close(lc); 760 lc = NULL; 761 reply(421, "Local resource failure"); 762 return; 763 } 764 if (logging) 765 strlcpy(curname, name, sizeof(curname)); 766 767 dochroot = (lc && login_getcapbool(lc, "ftp-chroot", 0)) || 768 checkuser(_PATH_FTPCHROOT, name); 769 if (anon_only && !dochroot) { 770 reply(530, "Sorry, only anonymous ftp allowed."); 771 return; 772 } 773 if (pw) { 774 if ((!shell && !dochroot) || checkuser(_PATH_FTPUSERS, name)) { 775 reply(530, "User %s access denied.", name); 776 if (logging) 777 syslog(LOG_NOTICE, 778 "FTP LOGIN REFUSED FROM %s, %s", 779 remotehost, name); 780 pw = NULL; 781 return; 782 } 783 } 784 785 if (as != NULL && (cp = auth_challenge(as)) != NULL) 786 reply(331, cp); 787 else 788 reply(331, "Password required for %s.", name); 789 790 askpasswd = 1; 791 /* 792 * Delay before reading passwd after first failed 793 * attempt to slow down passwd-guessing programs. 794 */ 795 if (login_attempts) 796 sleep((unsigned) login_attempts); 797} 798 799/* 800 * Check if a user is in the file "fname" 801 */ 802static int 803checkuser(fname, name) 804 char *fname; 805 char *name; 806{ 807 FILE *fp; 808 int found = 0; 809 char *p, line[BUFSIZ]; 810 811 if ((fp = fopen(fname, "r")) != NULL) { 812 while (fgets(line, sizeof(line), fp) != NULL) 813 if ((p = strchr(line, '\n')) != NULL) { 814 *p = '\0'; 815 if (line[0] == '#') 816 continue; 817 if (strcmp(line, name) == 0) { 818 found = 1; 819 break; 820 } 821 } 822 (void) fclose(fp); 823 } 824 return (found); 825} 826 827/* 828 * Terminate login as previous user, if any, resetting state; 829 * used when USER command is given or login fails. 830 */ 831static void 832end_login() 833{ 834 835 sigprocmask (SIG_BLOCK, &allsigs, NULL); 836 (void) seteuid((uid_t)0); 837 if (logged_in) { 838 ftpdlogwtmp(ttyline, "", ""); 839 if (doutmp) 840 logout(utmp.ut_line); 841 } 842 pw = NULL; 843 /* umask is restored in ftpcmd.y */ 844 setusercontext(NULL, getpwuid(0), (uid_t)0, 845 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES); 846 logged_in = 0; 847 guest = 0; 848 dochroot = 0; 849} 850 851void 852pass(passwd) 853 char *passwd; 854{ 855 int authok, flags; 856 FILE *fp; 857 static char homedir[MAXPATHLEN]; 858 char *dir, rootdir[MAXPATHLEN]; 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 authok = 0; 867 if (pw == NULL) { 868 useconds_t us; 869 870 /* Sleep between 1 and 3 seconds to emulate a crypt. */ 871 us = arc4random() % 3000000; 872 usleep(us); 873 } else { 874 authok = auth_userresponse(as, passwd, 0); 875 auth_close(as); 876 as = NULL; 877 } 878 if (authok == 0) { 879 reply(530, "Login incorrect."); 880 if (logging) 881 syslog(LOG_NOTICE, 882 "FTP LOGIN FAILED FROM %s, %s", 883 remotehost, curname); 884 pw = NULL; 885 if (login_attempts++ >= 5) { 886 syslog(LOG_NOTICE, 887 "repeated login failures from %s", 888 remotehost); 889 exit(0); 890 } 891 return; 892 } 893 } else if (lc != NULL) { 894 /* Save anonymous' password. */ 895 guestpw = strdup(passwd); 896 if (guestpw == (char *)NULL) 897 fatal("Out of memory"); 898 899 if ((as = auth_open()) == NULL) 900 fatal("Out of memory"); 901 auth_setoption(as, "FTPD_HOST", 902 multihome ? dhostname : hostname); 903 authok = auth_approval(as, lc, pw->pw_name, "ftp"); 904 auth_close(as); 905 as = NULL; 906 if (authok == 0) { 907 syslog(LOG_INFO|LOG_AUTH, 908 "FTP LOGIN FAILED (HOST) as %s: approval failure.", 909 pw->pw_name); 910 reply(530, "Approval failure.\n"); 911 exit(0); 912 } 913 } else { 914 syslog(LOG_INFO|LOG_AUTH, 915 "FTP LOGIN CLASS %s MISSING for %s: approval failure.", 916 pw->pw_class, pw->pw_name); 917 reply(530, "Permission denied.\n"); 918 exit(0); 919 } 920 login_attempts = 0; /* this time successful */ 921 if (setegid((gid_t)pw->pw_gid) < 0) { 922 reply(550, "Can't set gid."); 923 return; 924 } 925 /* set umask via setusercontext() unless -u flag was given. */ 926 flags = LOGIN_SETGROUP|LOGIN_SETPRIORITY|LOGIN_SETRESOURCES; 927 if (umaskchange) 928 flags |= LOGIN_SETUMASK; 929 else 930 (void) umask(defumask); 931 setusercontext(lc, pw, (uid_t)0, flags); 932 933 /* open wtmp before chroot */ 934 ftpdlogwtmp(ttyline, pw->pw_name, remotehost); 935 936 /* open utmp before chroot */ 937 if (doutmp) { 938 memset((void *)&utmp, 0, sizeof(utmp)); 939 (void)time(&utmp.ut_time); 940 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 941 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 942 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 943 login(&utmp); 944 } 945 946 /* open stats file before chroot */ 947 if (guest && (stats == 1) && (statfd < 0)) 948 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 949 stats = 0; 950 951 logged_in = 1; 952 953 if ((dir = login_getcapstr(lc, "ftp-dir", NULL, NULL))) { 954 char *newdir; 955 956 newdir = copy_dir(dir, pw); 957 if (newdir == NULL) { 958 perror_reply(421, "Local resource failure: malloc"); 959 dologout(1); 960 /* NOTREACHED */ 961 } 962 free(pw->pw_dir); 963 pw->pw_dir = newdir; 964 } 965 if (guest || dochroot) { 966 if (multihome && guest) { 967 struct stat ts; 968 969 /* Compute root directory. */ 970 snprintf(rootdir, sizeof(rootdir), "%s/%s", 971 pw->pw_dir, dhostname); 972 if (stat(rootdir, &ts) < 0) { 973 snprintf(rootdir, sizeof(rootdir), "%s/%s", 974 pw->pw_dir, hostname); 975 } 976 } else 977 strcpy(rootdir, pw->pw_dir); 978 } 979 if (guest) { 980 /* 981 * We MUST do a chdir() after the chroot. Otherwise 982 * the old current directory will be accessible as "." 983 * outside the new root! 984 */ 985 if (chroot(rootdir) < 0 || chdir("/") < 0) { 986 reply(550, "Can't set guest privileges."); 987 goto bad; 988 } 989 strcpy(pw->pw_dir, "/"); 990 if (setenv("HOME", "/", 1) == -1) { 991 reply(550, "Can't setup environment."); 992 goto bad; 993 } 994 } else if (dochroot) { 995 if (chroot(rootdir) < 0 || chdir("/") < 0) { 996 reply(550, "Can't change root."); 997 goto bad; 998 } 999 strcpy(pw->pw_dir, "/"); 1000 if (setenv("HOME", "/", 1) == -1) { 1001 reply(550, "Can't setup environment."); 1002 goto bad; 1003 } 1004 } else if (chdir(pw->pw_dir) < 0) { 1005 if (chdir("/") < 0) { 1006 reply(530, "User %s: can't change directory to %s.", 1007 pw->pw_name, pw->pw_dir); 1008 goto bad; 1009 } else 1010 lreply(230, "No directory! Logging in with home=/"); 1011 } 1012 if (seteuid((uid_t)pw->pw_uid) < 0) { 1013 reply(550, "Can't set uid."); 1014 goto bad; 1015 } 1016 sigprocmask(SIG_UNBLOCK, &allsigs, NULL); 1017 1018 /* 1019 * Set home directory so that use of ~ (tilde) works correctly. 1020 */ 1021 if (getcwd(homedir, MAXPATHLEN) != NULL) { 1022 if (setenv("HOME", homedir, 1) == -1) { 1023 reply(550, "Can't setup environment."); 1024 goto bad; 1025 } 1026 } 1027 1028 /* 1029 * Display a login message, if it exists. 1030 * N.B. reply(230,) must follow the message. 1031 */ 1032 if ((fp = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 1033 char *cp, line[LINE_MAX]; 1034 1035 while (fgets(line, sizeof(line), fp) != NULL) { 1036 if ((cp = strchr(line, '\n')) != NULL) 1037 *cp = '\0'; 1038 lreply(230, "%s", line); 1039 } 1040 (void) fflush(stdout); 1041 (void) fclose(fp); 1042 } 1043 if (guest) { 1044 if (ident != NULL) 1045 free(ident); 1046 ident = strdup(passwd); 1047 if (ident == NULL) 1048 fatal("Ran out of memory."); 1049 reply(230, "Guest login ok, access restrictions apply."); 1050#ifdef HASSETPROCTITLE 1051 snprintf(proctitle, sizeof(proctitle), 1052 "%s: anonymous/%.*s", remotehost, 1053 (int)(sizeof(proctitle) - sizeof(remotehost) - 1054 sizeof(": anonymous/")), passwd); 1055 setproctitle("%s", proctitle); 1056#endif /* HASSETPROCTITLE */ 1057 if (logging) 1058 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1059 remotehost, passwd); 1060 } else { 1061 reply(230, "User %s logged in.", pw->pw_name); 1062#ifdef HASSETPROCTITLE 1063 snprintf(proctitle, sizeof(proctitle), 1064 "%s: %s", remotehost, pw->pw_name); 1065 setproctitle("%s", proctitle); 1066#endif /* HASSETPROCTITLE */ 1067 if (logging) 1068 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1069 remotehost, pw->pw_name); 1070 } 1071 login_close(lc); 1072 lc = NULL; 1073 return; 1074bad: 1075 /* Forget all about it... */ 1076 login_close(lc); 1077 lc = NULL; 1078 end_login(); 1079} 1080 1081void 1082retrieve(cmd, name) 1083 char *cmd, *name; 1084{ 1085 FILE *fin, *dout; 1086 struct stat st; 1087 int (*closefunc) __P((FILE *)); 1088 time_t start; 1089 1090 if (cmd == 0) { 1091 fin = fopen(name, "r"), closefunc = fclose; 1092 st.st_size = 0; 1093 } else { 1094 char line[BUFSIZ]; 1095 1096 (void) snprintf(line, sizeof(line), cmd, name); 1097 name = line; 1098 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1099 st.st_size = -1; 1100 st.st_blksize = BUFSIZ; 1101 } 1102 if (fin == NULL) { 1103 if (errno != 0) { 1104 perror_reply(550, name); 1105 if (cmd == 0) { 1106 LOGCMD("get", name); 1107 } 1108 } 1109 return; 1110 } 1111 byte_count = -1; 1112 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1113 reply(550, "%s: not a plain file.", name); 1114 goto done; 1115 } 1116 if (restart_point) { 1117 if (type == TYPE_A) { 1118 off_t i, n; 1119 int c; 1120 1121 n = restart_point; 1122 i = 0; 1123 while (i++ < n) { 1124 if ((c=getc(fin)) == EOF) { 1125 perror_reply(550, name); 1126 goto done; 1127 } 1128 if (c == '\n') 1129 i++; 1130 } 1131 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1132 perror_reply(550, name); 1133 goto done; 1134 } 1135 } 1136 dout = dataconn(name, st.st_size, "w"); 1137 if (dout == NULL) 1138 goto done; 1139 time(&start); 1140 send_data(fin, dout, st.st_blksize, st.st_size, 1141 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 1142 if ((cmd == 0) && stats) 1143 logxfer(name, byte_count, start); 1144 (void) fclose(dout); 1145 data = -1; 1146done: 1147 if (pdata >= 0) 1148 (void) close(pdata); 1149 pdata = -1; 1150 if (cmd == 0) 1151 LOGBYTES("get", name, byte_count); 1152 (*closefunc)(fin); 1153} 1154 1155void 1156store(name, mode, unique) 1157 char *name, *mode; 1158 int unique; 1159{ 1160 FILE *fout, *din; 1161 int (*closefunc) __P((FILE *)); 1162 struct stat st; 1163 int fd; 1164 1165 if (restart_point && *mode != 'a') 1166 mode = "r+"; 1167 1168 if (unique && stat(name, &st) == 0) { 1169 char *nam; 1170 1171 fd = guniquefd(name, &nam); 1172 if (fd == -1) { 1173 LOGCMD(*mode == 'w' ? "put" : "append", name); 1174 return; 1175 } 1176 name = nam; 1177 fout = fdopen(fd, mode); 1178 } else 1179 fout = fopen(name, mode); 1180 1181 closefunc = fclose; 1182 if (fout == NULL) { 1183 perror_reply(553, name); 1184 LOGCMD(*mode == 'w' ? "put" : "append", name); 1185 return; 1186 } 1187 byte_count = -1; 1188 if (restart_point) { 1189 if (type == TYPE_A) { 1190 off_t i, n; 1191 int c; 1192 1193 n = restart_point; 1194 i = 0; 1195 while (i++ < n) { 1196 if ((c=getc(fout)) == EOF) { 1197 perror_reply(550, name); 1198 goto done; 1199 } 1200 if (c == '\n') 1201 i++; 1202 } 1203 /* 1204 * We must do this seek to "current" position 1205 * because we are changing from reading to 1206 * writing. 1207 */ 1208 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1209 perror_reply(550, name); 1210 goto done; 1211 } 1212 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1213 perror_reply(550, name); 1214 goto done; 1215 } 1216 } 1217 din = dataconn(name, (off_t)-1, "r"); 1218 if (din == NULL) 1219 goto done; 1220 if (receive_data(din, fout) == 0) { 1221 if (unique) 1222 reply(226, "Transfer complete (unique file name:%s).", 1223 name); 1224 else 1225 reply(226, "Transfer complete."); 1226 } 1227 (void) fclose(din); 1228 data = -1; 1229 pdata = -1; 1230done: 1231 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1232 (*closefunc)(fout); 1233} 1234 1235static FILE * 1236getdatasock(mode) 1237 char *mode; 1238{ 1239 int on = 1, s, t, tries; 1240 1241 if (data >= 0) 1242 return (fdopen(data, mode)); 1243 sigprocmask (SIG_BLOCK, &allsigs, NULL); 1244 (void) seteuid((uid_t)0); 1245 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1246 if (s < 0) 1247 goto bad; 1248 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1249 (char *) &on, sizeof(on)) < 0) 1250 goto bad; 1251 /* anchor socket to avoid multi-homing problems */ 1252 data_source = ctrl_addr; 1253 data_source.su_port = htons(20); /* ftp-data port */ 1254 for (tries = 1; ; tries++) { 1255 if (bind(s, (struct sockaddr *)&data_source, 1256 data_source.su_len) >= 0) 1257 break; 1258 if (errno != EADDRINUSE || tries > 10) 1259 goto bad; 1260 sleep(tries); 1261 } 1262 (void) seteuid((uid_t)pw->pw_uid); 1263 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1264 1265#ifdef IP_TOS 1266 if (ctrl_addr.su_family == AF_INET) { 1267 on = IPTOS_THROUGHPUT; 1268 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1269 sizeof(int)) < 0) 1270 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1271 } 1272#endif 1273#ifdef TCP_NOPUSH 1274 /* 1275 * Turn off push flag to keep sender TCP from sending short packets 1276 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1277 * to set the send buffer size as well, but that may not be desirable 1278 * in heavy-load situations. 1279 */ 1280 on = 1; 1281 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof(on)) < 0) 1282 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1283#endif 1284#ifdef SO_SNDBUF 1285 on = 65536; 1286 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof(on)) < 0) 1287 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1288#endif 1289 1290 return (fdopen(s, mode)); 1291bad: 1292 /* Return the real value of errno (close may change it) */ 1293 t = errno; 1294 (void) seteuid((uid_t)pw->pw_uid); 1295 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1296 (void) close(s); 1297 errno = t; 1298 return (NULL); 1299} 1300 1301static FILE * 1302dataconn(name, size, mode) 1303 char *name; 1304 off_t size; 1305 char *mode; 1306{ 1307 char sizebuf[32]; 1308 FILE *file; 1309 int retry = 0; 1310 in_port_t *p; 1311 char *fa, *ha; 1312 int alen; 1313 1314 file_size = size; 1315 byte_count = 0; 1316 if (size != (off_t) -1) { 1317 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1318 size); 1319 } else 1320 sizebuf[0] = '\0'; 1321 if (pdata >= 0) { 1322 union sockunion from; 1323 int s, fromlen = sizeof(from); 1324 1325 signal (SIGALRM, toolong); 1326 (void) alarm ((unsigned) timeout); 1327 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1328 (void) alarm (0); 1329 if (s < 0) { 1330 reply(425, "Can't open data connection."); 1331 (void) close(pdata); 1332 pdata = -1; 1333 return (NULL); 1334 } 1335 switch (from.su_family) { 1336 case AF_INET: 1337 p = (in_port_t *)&from.su_sin.sin_port; 1338 fa = (u_char *)&from.su_sin.sin_addr; 1339 ha = (u_char *)&his_addr.su_sin.sin_addr; 1340 alen = sizeof(struct in_addr); 1341 break; 1342 case AF_INET6: 1343 p = (in_port_t *)&from.su_sin6.sin6_port; 1344 fa = (u_char *)&from.su_sin6.sin6_addr; 1345 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1346 alen = sizeof(struct in6_addr); 1347 break; 1348 default: 1349 perror_reply(425, "Can't build data connection"); 1350 (void) close(pdata); 1351 (void) close(s); 1352 pdata = -1; 1353 return (NULL); 1354 } 1355 if (from.su_family != his_addr.su_family || 1356 ntohs(*p) < IPPORT_RESERVED) { 1357 perror_reply(425, "Can't build data connection"); 1358 (void) close(pdata); 1359 (void) close(s); 1360 pdata = -1; 1361 return (NULL); 1362 } 1363 if (portcheck && memcmp(fa, ha, alen) != 0) { 1364 perror_reply(435, "Can't build data connection"); 1365 (void) close(pdata); 1366 (void) close(s); 1367 pdata = -1; 1368 return (NULL); 1369 } 1370 (void) close(pdata); 1371 pdata = s; 1372 reply(150, "Opening %s mode data connection for '%s'%s.", 1373 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1374 return (fdopen(pdata, mode)); 1375 } 1376 if (data >= 0) { 1377 reply(125, "Using existing data connection for '%s'%s.", 1378 name, sizebuf); 1379 usedefault = 1; 1380 return (fdopen(data, mode)); 1381 } 1382 if (usedefault) 1383 data_dest = his_addr; 1384 usedefault = 1; 1385 file = getdatasock(mode); 1386 if (file == NULL) { 1387 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1388 1389 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1390 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1391 NI_NUMERICHOST | NI_NUMERICSERV); 1392 reply(425, "Can't create data socket (%s,%s): %s.", 1393 hbuf, pbuf, strerror(errno)); 1394 return (NULL); 1395 } 1396 data = fileno(file); 1397 1398 /* 1399 * attempt to connect to reserved port on client machine; 1400 * this looks like an attack 1401 */ 1402 switch (data_dest.su_family) { 1403 case AF_INET: 1404 p = (in_port_t *)&data_dest.su_sin.sin_port; 1405 fa = (u_char *)&data_dest.su_sin.sin_addr; 1406 ha = (u_char *)&his_addr.su_sin.sin_addr; 1407 alen = sizeof(struct in_addr); 1408 break; 1409 case AF_INET6: 1410 p = (in_port_t *)&data_dest.su_sin6.sin6_port; 1411 fa = (u_char *)&data_dest.su_sin6.sin6_addr; 1412 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1413 alen = sizeof(struct in6_addr); 1414 break; 1415 default: 1416 perror_reply(425, "Can't build data connection"); 1417 (void) fclose(file); 1418 pdata = -1; 1419 return (NULL); 1420 } 1421 if (data_dest.su_family != his_addr.su_family || 1422 ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */ 1423 perror_reply(425, "Can't build data connection"); 1424 (void) fclose(file); 1425 data = -1; 1426 return NULL; 1427 } 1428 if (portcheck && memcmp(fa, ha, alen) != 0) { 1429 perror_reply(435, "Can't build data connection"); 1430 (void) fclose(file); 1431 data = -1; 1432 return NULL; 1433 } 1434 while (connect(data, (struct sockaddr *)&data_dest, 1435 data_dest.su_len) < 0) { 1436 if (errno == EADDRINUSE && retry < swaitmax) { 1437 sleep((unsigned) swaitint); 1438 retry += swaitint; 1439 continue; 1440 } 1441 perror_reply(425, "Can't build data connection"); 1442 (void) fclose(file); 1443 data = -1; 1444 return (NULL); 1445 } 1446 reply(150, "Opening %s mode data connection for '%s'%s.", 1447 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1448 return (file); 1449} 1450 1451/* 1452 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1453 * encapsulation of the data subject to Mode, Structure, and Type. 1454 * 1455 * NB: Form isn't handled. 1456 */ 1457static void 1458send_data(instr, outstr, blksize, filesize, isreg) 1459 FILE *instr, *outstr; 1460 off_t blksize; 1461 off_t filesize; 1462 int isreg; 1463{ 1464 int c, cnt, filefd, netfd; 1465 char *buf, *bp; 1466 size_t len; 1467 1468 transflag++; 1469 if (setjmp(urgcatch)) { 1470 transflag = 0; 1471 return; 1472 } 1473 switch (type) { 1474 1475 case TYPE_A: 1476 while ((c = getc(instr)) != EOF) { 1477 byte_count++; 1478 if (c == '\n') { 1479 if (ferror(outstr)) 1480 goto data_err; 1481 (void) putc('\r', outstr); 1482 } 1483 (void) putc(c, outstr); 1484 } 1485 fflush(outstr); 1486 transflag = 0; 1487 if (ferror(instr)) 1488 goto file_err; 1489 if (ferror(outstr)) 1490 goto data_err; 1491 reply(226, "Transfer complete."); 1492 return; 1493 1494 case TYPE_I: 1495 case TYPE_L: 1496 /* 1497 * isreg is only set if we are not doing restart and we 1498 * are sending a regular file 1499 */ 1500 netfd = fileno(outstr); 1501 filefd = fileno(instr); 1502 1503 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1504 buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd, 1505 (off_t)0); 1506 if (buf == MAP_FAILED) { 1507 syslog(LOG_WARNING, "mmap(%lu): %m", 1508 (unsigned long)filesize); 1509 goto oldway; 1510 } 1511 bp = buf; 1512 len = filesize; 1513 do { 1514 cnt = write(netfd, bp, len); 1515 len -= cnt; 1516 bp += cnt; 1517 if (cnt > 0) byte_count += cnt; 1518 } while(cnt > 0 && len > 0); 1519 1520 transflag = 0; 1521 munmap(buf, (size_t)filesize); 1522 if (cnt < 0) 1523 goto data_err; 1524 reply(226, "Transfer complete."); 1525 return; 1526 } 1527 1528oldway: 1529 if ((buf = malloc((u_int)blksize)) == NULL) { 1530 transflag = 0; 1531 perror_reply(451, "Local resource failure: malloc"); 1532 return; 1533 } 1534 1535 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1536 write(netfd, buf, cnt) == cnt) 1537 byte_count += cnt; 1538 transflag = 0; 1539 (void)free(buf); 1540 if (cnt != 0) { 1541 if (cnt < 0) 1542 goto file_err; 1543 goto data_err; 1544 } 1545 reply(226, "Transfer complete."); 1546 return; 1547 default: 1548 transflag = 0; 1549 reply(550, "Unimplemented TYPE %d in send_data", type); 1550 return; 1551 } 1552 1553data_err: 1554 transflag = 0; 1555 perror_reply(426, "Data connection"); 1556 return; 1557 1558file_err: 1559 transflag = 0; 1560 perror_reply(551, "Error on input file"); 1561} 1562 1563/* 1564 * Transfer data from peer to "outstr" using the appropriate encapulation of 1565 * the data subject to Mode, Structure, and Type. 1566 * 1567 * N.B.: Form isn't handled. 1568 */ 1569static int 1570receive_data(instr, outstr) 1571 FILE *instr, *outstr; 1572{ 1573 int c; 1574 int cnt, bare_lfs = 0; 1575 char buf[BUFSIZ]; 1576 1577 transflag++; 1578 if (setjmp(urgcatch)) { 1579 transflag = 0; 1580 return (-1); 1581 } 1582 switch (type) { 1583 1584 case TYPE_I: 1585 case TYPE_L: 1586 signal (SIGALRM, lostconn); 1587 1588 do { 1589 (void) alarm ((unsigned) timeout); 1590 cnt = read(fileno(instr), buf, sizeof(buf)); 1591 (void) alarm (0); 1592 1593 if (cnt > 0) { 1594 if (write(fileno(outstr), buf, cnt) != cnt) 1595 goto file_err; 1596 byte_count += cnt; 1597 } 1598 } while (cnt > 0); 1599 if (cnt < 0) 1600 goto data_err; 1601 transflag = 0; 1602 return (0); 1603 1604 case TYPE_E: 1605 reply(553, "TYPE E not implemented."); 1606 transflag = 0; 1607 return (-1); 1608 1609 case TYPE_A: 1610 while ((c = getc(instr)) != EOF) { 1611 byte_count++; 1612 if (c == '\n') 1613 bare_lfs++; 1614 while (c == '\r') { 1615 if (ferror(outstr)) 1616 goto data_err; 1617 if ((c = getc(instr)) != '\n') { 1618 (void) putc ('\r', outstr); 1619 if (c == '\0' || c == EOF) 1620 goto contin2; 1621 } 1622 } 1623 (void) putc(c, outstr); 1624 contin2: ; 1625 } 1626 fflush(outstr); 1627 if (ferror(instr)) 1628 goto data_err; 1629 if (ferror(outstr)) 1630 goto file_err; 1631 transflag = 0; 1632 if (bare_lfs) { 1633 lreply(226, 1634 "WARNING! %d bare linefeeds received in ASCII mode", 1635 bare_lfs); 1636 printf(" File may not have transferred correctly.\r\n"); 1637 } 1638 return (0); 1639 default: 1640 reply(550, "Unimplemented TYPE %d in receive_data", type); 1641 transflag = 0; 1642 return (-1); 1643 } 1644 1645data_err: 1646 transflag = 0; 1647 perror_reply(426, "Data Connection"); 1648 return (-1); 1649 1650file_err: 1651 transflag = 0; 1652 perror_reply(452, "Error writing file"); 1653 return (-1); 1654} 1655 1656void 1657statfilecmd(filename) 1658 char *filename; 1659{ 1660 FILE *fin; 1661 int c; 1662 int atstart; 1663 char line[LINE_MAX]; 1664 1665 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1666 fin = ftpd_popen(line, "r"); 1667 lreply(211, "status of %s:", filename); 1668 atstart = 1; 1669 while ((c = getc(fin)) != EOF) { 1670 if (c == '\n') { 1671 if (ferror(stdout)){ 1672 perror_reply(421, "control connection"); 1673 (void) ftpd_pclose(fin); 1674 dologout(1); 1675 /* NOTREACHED */ 1676 } 1677 if (ferror(fin)) { 1678 perror_reply(551, filename); 1679 (void) ftpd_pclose(fin); 1680 return; 1681 } 1682 (void) putc('\r', stdout); 1683 } 1684 if (atstart && isdigit(c)) 1685 (void) putc(' ', stdout); 1686 (void) putc(c, stdout); 1687 atstart = (c == '\n'); 1688 } 1689 (void) ftpd_pclose(fin); 1690 reply(211, "End of Status"); 1691} 1692 1693void 1694statcmd() 1695{ 1696 union sockunion *su; 1697 u_char *a, *p; 1698 char hbuf[MAXHOSTNAMELEN]; 1699 int ispassive; 1700 1701 lreply(211, "%s FTP server status:", hostname, version); 1702 printf(" %s\r\n", version); 1703 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1704 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST); 1705 printf(" Connected to %s", remotehost); 1706 if (strcmp(remotehost, hbuf) != 0) 1707 printf(" (%s)", hbuf); 1708 printf("\r\n"); 1709 if (logged_in) { 1710 if (guest) 1711 printf(" Logged in anonymously\r\n"); 1712 else 1713 printf(" Logged in as %s\r\n", pw->pw_name); 1714 } else if (askpasswd) 1715 printf(" Waiting for password\r\n"); 1716 else 1717 printf(" Waiting for user name\r\n"); 1718 printf(" TYPE: %s", typenames[type]); 1719 if (type == TYPE_A || type == TYPE_E) 1720 printf(", FORM: %s", formnames[form]); 1721 if (type == TYPE_L) 1722#if NBBY == 8 1723 printf(" %d", NBBY); 1724#else 1725 printf(" %d", bytesize); /* need definition! */ 1726#endif 1727 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1728 strunames[stru], modenames[mode]); 1729 ispassive = 0; 1730 if (data != -1) 1731 printf(" Data connection open\r\n"); 1732 else if (pdata != -1) { 1733 printf(" in Passive mode\r\n"); 1734 su = (union sockunion *)&pasv_addr; 1735 ispassive++; 1736 goto printaddr; 1737 } else if (usedefault == 0) { 1738 su = (union sockunion *)&data_dest; 1739printaddr: 1740 /* PASV/PORT */ 1741 if (su->su_family == AF_INET) { 1742 if (ispassive) 1743 printf("211- PASV "); 1744 else 1745 printf("211- PORT "); 1746 a = (u_char *) &su->su_sin.sin_addr; 1747 p = (u_char *) &su->su_sin.sin_port; 1748 printf("(%u,%u,%u,%u,%u,%u)\r\n", 1749 a[0], a[1], a[2], a[3], 1750 p[0], p[1]); 1751 } 1752 1753 /* LPSV/LPRT */ 1754 { 1755 int alen, af, i; 1756 1757 alen = 0; 1758 switch (su->su_family) { 1759 case AF_INET: 1760 a = (u_char *) &su->su_sin.sin_addr; 1761 p = (u_char *) &su->su_sin.sin_port; 1762 alen = sizeof(su->su_sin.sin_addr); 1763 af = 4; 1764 break; 1765 case AF_INET6: 1766 a = (u_char *) &su->su_sin6.sin6_addr; 1767 p = (u_char *) &su->su_sin6.sin6_port; 1768 alen = sizeof(su->su_sin6.sin6_addr); 1769 af = 6; 1770 break; 1771 default: 1772 af = 0; 1773 break; 1774 } 1775 if (af) { 1776 if (ispassive) 1777 printf("211- LPSV "); 1778 else 1779 printf("211- LPRT "); 1780 printf("(%u,%u", af, alen); 1781 for (i = 0; i < alen; i++) 1782 printf(",%u", a[i]); 1783 printf(",%u,%u,%u)\r\n", 2, p[0], p[1]); 1784 } 1785 } 1786 1787 /* EPRT/EPSV */ 1788epsvonly: 1789 { 1790 u_char af; 1791 1792 switch (su->su_family) { 1793 case AF_INET: 1794 af = 1; 1795 break; 1796 case AF_INET6: 1797 af = 2; 1798 break; 1799 default: 1800 af = 0; 1801 break; 1802 } 1803 if (af) { 1804 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1805 if (getnameinfo((struct sockaddr *)su, su->su_len, 1806 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1807 NI_NUMERICHOST) == 0) { 1808 if (ispassive) 1809 printf("211- EPSV "); 1810 else 1811 printf("211- EPRT "); 1812 printf("(|%u|%s|%s|)\r\n", 1813 af, hbuf, pbuf); 1814 } 1815 } 1816 } 1817 } else 1818 printf(" No data connection\r\n"); 1819 reply(211, "End of status"); 1820} 1821 1822void 1823fatal(s) 1824 char *s; 1825{ 1826 1827 reply(451, "Error in server: %s\n", s); 1828 reply(221, "Closing connection due to server error."); 1829 dologout(0); 1830 /* NOTREACHED */ 1831} 1832 1833void 1834#ifdef __STDC__ 1835reply(int n, const char *fmt, ...) 1836#else 1837reply(n, fmt, va_alist) 1838 int n; 1839 char *fmt; 1840 va_dcl 1841#endif 1842{ 1843 char *buf, *p, *next; 1844 va_list ap; 1845#ifdef __STDC__ 1846 va_start(ap, fmt); 1847#else 1848 va_start(ap); 1849#endif 1850 if (vasprintf(&buf, fmt, ap) == -1 || buf == NULL) { 1851 printf("412 Local resource failure: malloc\r\n"); 1852 fflush(stdout); 1853 dologout(1); 1854 } 1855 next = buf; 1856 while ((p = strsep(&next, "\n\r"))) { 1857 printf("%d%s %s\r\n", n, (next != '\0') ? "-" : "", p); 1858 if (debug) 1859 syslog(LOG_DEBUG, "<--- %d%s %s", n, 1860 (next != '\0') ? "-" : "", p); 1861 } 1862 (void)fflush(stdout); 1863 free(buf); 1864} 1865 1866void 1867#ifdef __STDC__ 1868lreply(int n, const char *fmt, ...) 1869#else 1870lreply(n, fmt, va_alist) 1871 int n; 1872 char *fmt; 1873 va_dcl 1874#endif 1875{ 1876 va_list ap; 1877#ifdef __STDC__ 1878 va_start(ap, fmt); 1879#else 1880 va_start(ap); 1881#endif 1882 (void)printf("%d- ", n); 1883 (void)vprintf(fmt, ap); 1884 va_end(ap); 1885 (void)printf("\r\n"); 1886 (void)fflush(stdout); 1887 if (debug) { 1888#ifdef __STDC__ 1889 va_start(ap, fmt); 1890#else 1891 va_start(ap); 1892#endif 1893 syslog(LOG_DEBUG, "<--- %d- ", n); 1894 vsyslog(LOG_DEBUG, fmt, ap); 1895 va_end(ap); 1896 } 1897} 1898 1899static void 1900ack(s) 1901 char *s; 1902{ 1903 1904 reply(250, "%s command successful.", s); 1905} 1906 1907void 1908nack(s) 1909 char *s; 1910{ 1911 1912 reply(502, "%s command not implemented.", s); 1913} 1914 1915/* ARGSUSED */ 1916void 1917yyerror(s) 1918 char *s; 1919{ 1920 char *cp; 1921 1922 if ((cp = strchr(cbuf,'\n'))) 1923 *cp = '\0'; 1924 reply(500, "'%s': command not understood.", cbuf); 1925} 1926 1927void 1928delete(name) 1929 char *name; 1930{ 1931 struct stat st; 1932 1933 LOGCMD("delete", name); 1934 if (stat(name, &st) < 0) { 1935 perror_reply(550, name); 1936 return; 1937 } 1938 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1939 if (rmdir(name) < 0) { 1940 perror_reply(550, name); 1941 return; 1942 } 1943 goto done; 1944 } 1945 if (unlink(name) < 0) { 1946 perror_reply(550, name); 1947 return; 1948 } 1949done: 1950 ack("DELE"); 1951} 1952 1953void 1954cwd(path) 1955 char *path; 1956{ 1957 FILE *message; 1958 1959 if (chdir(path) < 0) 1960 perror_reply(550, path); 1961 else { 1962 if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) { 1963 char *cp, line[LINE_MAX]; 1964 1965 while (fgets(line, sizeof(line), message) != NULL) { 1966 if ((cp = strchr(line, '\n')) != NULL) 1967 *cp = '\0'; 1968 lreply(250, "%s", line); 1969 } 1970 (void) fflush(stdout); 1971 (void) fclose(message); 1972 } 1973 ack("CWD"); 1974 } 1975} 1976 1977void 1978replydirname(name, message) 1979 const char *name, *message; 1980{ 1981 char *p, *ep; 1982 char npath[MAXPATHLEN * 2]; 1983 1984 p = npath; 1985 ep = &npath[sizeof(npath) - 1]; 1986 while (*name) { 1987 if (*name == '"') { 1988 if (ep - p < 2) 1989 break; 1990 *p++ = *name++; 1991 *p++ = '"'; 1992 } else { 1993 if (ep - p < 1) 1994 break; 1995 *p++ = *name++; 1996 } 1997 } 1998 *p = '\0'; 1999 reply(257, "\"%s\" %s", npath, message); 2000} 2001 2002void 2003makedir(name) 2004 char *name; 2005{ 2006 2007 LOGCMD("mkdir", name); 2008 if (mkdir(name, 0777) < 0) 2009 perror_reply(550, name); 2010 else 2011 replydirname(name, "directory created."); 2012} 2013 2014void 2015removedir(name) 2016 char *name; 2017{ 2018 2019 LOGCMD("rmdir", name); 2020 if (rmdir(name) < 0) 2021 perror_reply(550, name); 2022 else 2023 ack("RMD"); 2024} 2025 2026void 2027pwd() 2028{ 2029 char path[MAXPATHLEN]; 2030 2031 if (getcwd(path, sizeof(path)) == NULL) 2032 reply(550, "Can't get current directory: %s.", strerror(errno)); 2033 else 2034 replydirname(path, "is current directory."); 2035} 2036 2037char * 2038renamefrom(name) 2039 char *name; 2040{ 2041 struct stat st; 2042 2043 if (stat(name, &st) < 0) { 2044 perror_reply(550, name); 2045 return ((char *)0); 2046 } 2047 reply(350, "File exists, ready for destination name"); 2048 return (name); 2049} 2050 2051void 2052renamecmd(from, to) 2053 char *from, *to; 2054{ 2055 2056 LOGCMD2("rename", from, to); 2057 if (rename(from, to) < 0) 2058 perror_reply(550, "rename"); 2059 else 2060 ack("RNTO"); 2061} 2062 2063static void 2064dolog(sa) 2065 struct sockaddr *sa; 2066{ 2067 char hbuf[sizeof(remotehost)]; 2068 2069 getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0); 2070 (void) strlcpy(remotehost, hbuf, sizeof(remotehost)); 2071 2072#ifdef HASSETPROCTITLE 2073 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2074 setproctitle("%s", proctitle); 2075#endif /* HASSETPROCTITLE */ 2076 2077 if (logging) 2078 syslog(LOG_INFO, "connection from %s", remotehost); 2079} 2080 2081/* 2082 * Record logout in wtmp file 2083 * and exit with supplied status. 2084 */ 2085void 2086dologout(status) 2087 int status; 2088{ 2089 2090 transflag = 0; 2091 2092 if (logged_in) { 2093 sigprocmask(SIG_BLOCK, &allsigs, NULL); 2094 (void) seteuid((uid_t)0); 2095 ftpdlogwtmp(ttyline, "", ""); 2096 if (doutmp) 2097 logout(utmp.ut_line); 2098 } 2099 /* beware of flushing buffers after a SIGPIPE */ 2100 _exit(status); 2101} 2102 2103static void 2104myoob(signo) 2105 int signo; 2106{ 2107 char *cp; 2108 int save_errno = errno; 2109 2110 /* only process if transfer occurring */ 2111 if (!transflag) 2112 return; 2113 cp = tmpline; 2114 if (getline(cp, 7, stdin) == NULL) { 2115 reply(221, "You could at least say goodbye."); 2116 dologout(0); 2117 } 2118 upper(cp); 2119 if (strcmp(cp, "ABOR\r\n") == 0) { 2120 tmpline[0] = '\0'; 2121 reply(426, "Transfer aborted. Data connection closed."); 2122 reply(226, "Abort successful"); 2123 longjmp(urgcatch, 1); 2124 } 2125 if (strcmp(cp, "STAT\r\n") == 0) { 2126 tmpline[0] = '\0'; 2127 if (file_size != (off_t) -1) 2128 reply(213, "Status: %qd of %qd bytes transferred", 2129 byte_count, file_size); 2130 else 2131 reply(213, "Status: %qd bytes transferred", byte_count); 2132 } 2133 errno = save_errno; 2134} 2135 2136/* 2137 * Note: a response of 425 is not mentioned as a possible response to 2138 * the PASV command in RFC959. However, it has been blessed as 2139 * a legitimate response by Jon Postel in a telephone conversation 2140 * with Rick Adams on 25 Jan 89. 2141 */ 2142void 2143passive() 2144{ 2145 int len, on; 2146 u_char *p, *a; 2147 2148 if (pw == NULL) { 2149 reply(530, "Please login with USER and PASS"); 2150 return; 2151 } 2152 if (pdata >= 0) 2153 close(pdata); 2154 /* 2155 * XXX 2156 * At this point, it would be nice to have an algorithm that 2157 * inserted a growing delay in an attack scenario. Such a thing 2158 * would look like continual passive sockets being opened, but 2159 * nothing serious being done with them. They're not used to 2160 * move data; the entire attempt is just to use tcp FIN_WAIT 2161 * resources. 2162 */ 2163 pdata = socket(AF_INET, SOCK_STREAM, 0); 2164 if (pdata < 0) { 2165 perror_reply(425, "Can't open passive connection"); 2166 return; 2167 } 2168 2169#ifdef IP_PORTRANGE 2170 on = high_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; 2171 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2172 (char *)&on, sizeof(on)) < 0) 2173 goto pasv_error; 2174#endif 2175 2176 pasv_addr = ctrl_addr; 2177 pasv_addr.su_sin.sin_port = 0; 2178 if (bind(pdata, (struct sockaddr *)&pasv_addr, 2179 pasv_addr.su_len) < 0) 2180 goto pasv_error; 2181 2182 len = sizeof(pasv_addr); 2183 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2184 goto pasv_error; 2185 if (listen(pdata, 1) < 0) 2186 goto pasv_error; 2187 a = (u_char *) &pasv_addr.su_sin.sin_addr; 2188 p = (u_char *) &pasv_addr.su_sin.sin_port; 2189 2190 reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0], 2191 a[1], a[2], a[3], p[0], p[1]); 2192 return; 2193 2194pasv_error: 2195 (void) seteuid((uid_t)pw->pw_uid); 2196 (void) close(pdata); 2197 pdata = -1; 2198 perror_reply(425, "Can't open passive connection"); 2199 return; 2200} 2201 2202/* 2203 * convert protocol identifier to/from AF 2204 */ 2205int 2206lpsvproto2af(int proto) 2207{ 2208 2209 switch (proto) { 2210 case 4: return AF_INET; 2211#ifdef INET6 2212 case 6: return AF_INET6; 2213#endif 2214 default: return -1; 2215 } 2216} 2217 2218int 2219af2lpsvproto(int af) 2220{ 2221 2222 switch (af) { 2223 case AF_INET: return 4; 2224#ifdef INET6 2225 case AF_INET6: return 6; 2226#endif 2227 default: return -1; 2228 } 2229} 2230 2231int 2232epsvproto2af(int proto) 2233{ 2234 2235 switch (proto) { 2236 case 1: return AF_INET; 2237#ifdef INET6 2238 case 2: return AF_INET6; 2239#endif 2240 default: return -1; 2241 } 2242} 2243 2244int 2245af2epsvproto(int af) 2246{ 2247 2248 switch (af) { 2249 case AF_INET: return 1; 2250#ifdef INET6 2251 case AF_INET6: return 2; 2252#endif 2253 default: return -1; 2254 } 2255} 2256 2257/* 2258 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2259 * 229 Entering Extended Passive Mode (|||port|) 2260 */ 2261void 2262long_passive(char *cmd, int pf) 2263{ 2264 int len, on; 2265 register u_char *p, *a; 2266 2267 if (!logged_in) { 2268 syslog(LOG_NOTICE, "long passive but not logged in"); 2269 reply(503, "Login with USER first."); 2270 return; 2271 } 2272 2273 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2274 /* 2275 * XXX 2276 * only EPRT/EPSV ready clients will understand this 2277 */ 2278 if (strcmp(cmd, "EPSV") != 0) 2279 reply(501, "Network protocol mismatch"); /*XXX*/ 2280 else 2281 epsv_protounsupp("Network protocol mismatch"); 2282 2283 return; 2284 } 2285 2286 if (pdata >= 0) 2287 close(pdata); 2288 /* 2289 * XXX 2290 * At this point, it would be nice to have an algorithm that 2291 * inserted a growing delay in an attack scenario. Such a thing 2292 * would look like continual passive sockets being opened, but 2293 * nothing serious being done with them. They not used to move 2294 * data; the entire attempt is just to use tcp FIN_WAIT 2295 * resources. 2296 */ 2297 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2298 if (pdata < 0) { 2299 perror_reply(425, "Can't open passive connection"); 2300 return; 2301 } 2302 2303 switch (ctrl_addr.su_family) { 2304 case AF_INET: 2305#ifdef IP_PORTRANGE 2306 on = high_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; 2307 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2308 (char *)&on, sizeof(on)) < 0) 2309 goto pasv_error; 2310#endif 2311 break; 2312 case AF_INET6: 2313#ifdef IPV6_PORTRANGE 2314 on = high_data_ports ? IPV6_PORTRANGE_HIGH 2315 : IPV6_PORTRANGE_DEFAULT; 2316 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2317 (char *)&on, sizeof(on)) < 0) 2318 goto pasv_error; 2319#endif 2320 break; 2321 } 2322 2323 pasv_addr = ctrl_addr; 2324 pasv_addr.su_port = 0; 2325 (void) seteuid((uid_t) 0); 2326 if (bind(pdata, (struct sockaddr *) &pasv_addr, pasv_addr.su_len) < 0) { 2327 (void) seteuid((uid_t) pw->pw_uid); 2328 goto pasv_error; 2329 } 2330 (void) seteuid((uid_t) pw->pw_uid); 2331 len = pasv_addr.su_len; 2332 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2333 goto pasv_error; 2334 if (listen(pdata, 1) < 0) 2335 goto pasv_error; 2336 p = (u_char *) &pasv_addr.su_port; 2337 2338 if (strcmp(cmd, "LPSV") == 0) { 2339 switch (pasv_addr.su_family) { 2340 case AF_INET: 2341 a = (u_char *) &pasv_addr.su_sin.sin_addr; 2342 reply(228, 2343 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2344 4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]); 2345 return; 2346 case AF_INET6: 2347 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2348 reply(228, 2349 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u," 2350 "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2351 6, 16, a[0], a[1], a[2], a[3], a[4], 2352 a[5], a[6], a[7], a[8], a[9], a[10], 2353 a[11], a[12], a[13], a[14], a[15], 2354 2, p[0], p[1]); 2355 return; 2356 } 2357 } else if (strcmp(cmd, "EPSV") == 0) { 2358 switch (pasv_addr.su_family) { 2359 case AF_INET: 2360 case AF_INET6: 2361 reply(229, "Entering Extended Passive Mode (|||%u|)", 2362 ntohs(pasv_addr.su_port)); 2363 return; 2364 } 2365 } else { 2366 /* more proper error code? */ 2367 } 2368 2369 pasv_error: 2370 (void) close(pdata); 2371 pdata = -1; 2372 perror_reply(425, "Can't open passive connection"); 2373 return; 2374} 2375 2376/* 2377 * EPRT |proto|addr|port| 2378 */ 2379int 2380extended_port(const char *arg) 2381{ 2382 char *tmp = NULL; 2383 char *result[3]; 2384 char *p, *q; 2385 char delim; 2386 struct addrinfo hints; 2387 struct addrinfo *res = NULL; 2388 int i; 2389 unsigned long proto; 2390 2391 if (epsvall) { 2392 reply(501, "EPRT disallowed after EPSV ALL"); 2393 return -1; 2394 } 2395 2396 usedefault = 0; 2397 if (pdata >= 0) { 2398 (void) close(pdata); 2399 pdata = -1; 2400 } 2401 2402 tmp = strdup(arg); 2403 if (!tmp) { 2404 fatal("not enough core."); 2405 /*NOTREACHED*/ 2406 } 2407 p = tmp; 2408 delim = p[0]; 2409 p++; 2410 memset(result, 0, sizeof(result)); 2411 for (i = 0; i < 3; i++) { 2412 q = strchr(p, delim); 2413 if (!q || *q != delim) 2414 goto parsefail; 2415 *q++ = '\0'; 2416 result[i] = p; 2417 p = q; 2418 } 2419 2420 /* some more sanity check */ 2421 p = NULL; 2422 (void)strtoul(result[2], &p, 10); 2423 if (!*result[2] || *p) 2424 goto protounsupp; 2425 p = NULL; 2426 proto = strtoul(result[0], &p, 10); 2427 if (!*result[0] || *p) 2428 goto protounsupp; 2429 2430 memset(&hints, 0, sizeof(hints)); 2431 hints.ai_family = epsvproto2af((int)proto); 2432 if (hints.ai_family < 0) 2433 goto protounsupp; 2434 hints.ai_socktype = SOCK_STREAM; 2435 hints.ai_flags = AI_NUMERICHOST; /*no DNS*/ 2436 if (getaddrinfo(result[1], result[2], &hints, &res)) 2437 goto parsefail; 2438 if (res->ai_next) 2439 goto parsefail; 2440 if (sizeof(data_dest) < res->ai_addrlen) 2441 goto parsefail; 2442 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2443 if (his_addr.su_family == AF_INET6 && 2444 data_dest.su_family == AF_INET6) { 2445 /* XXX more sanity checks! */ 2446 data_dest.su_sin6.sin6_scope_id = 2447 his_addr.su_sin6.sin6_scope_id; 2448 } 2449 if (pdata >= 0) { 2450 (void) close(pdata); 2451 pdata = -1; 2452 } 2453 reply(200, "EPRT command successful."); 2454 2455 if (tmp) 2456 free(tmp); 2457 if (res) 2458 freeaddrinfo(res); 2459 return 0; 2460 2461parsefail: 2462 reply(500, "Invalid argument, rejected."); 2463 usedefault = 1; 2464 if (tmp) 2465 free(tmp); 2466 if (res) 2467 freeaddrinfo(res); 2468 return -1; 2469 2470protounsupp: 2471 epsv_protounsupp("Protocol not supported"); 2472 usedefault = 1; 2473 if (tmp) 2474 free(tmp); 2475 if (res) 2476 freeaddrinfo(res); 2477 return -1; 2478} 2479 2480/* 2481 * 522 Protocol not supported (proto,...) 2482 * as we assume address family for control and data connections are the same, 2483 * we do not return the list of address families we support - instead, we 2484 * return the address family of the control connection. 2485 */ 2486void 2487epsv_protounsupp(const char *message) 2488{ 2489 int proto; 2490 2491 proto = af2epsvproto(ctrl_addr.su_family); 2492 if (proto < 0) 2493 reply(501, "%s", message); /*XXX*/ 2494 else 2495 reply(522, "%s, use (%d)", message, proto); 2496} 2497 2498/* 2499 * Generate unique name for file with basename "local". 2500 * The file named "local" is already known to exist. 2501 * Generates failure reply on error. 2502 */ 2503static int 2504guniquefd(local, nam) 2505 char *local; 2506 char **nam; 2507{ 2508 static char new[MAXPATHLEN]; 2509 struct stat st; 2510 int count, len, fd; 2511 char *cp; 2512 2513 cp = strrchr(local, '/'); 2514 if (cp) 2515 *cp = '\0'; 2516 if (stat(cp ? local : ".", &st) < 0) { 2517 perror_reply(553, cp ? local : "."); 2518 return (-1); 2519 } 2520 if (cp) 2521 *cp = '/'; 2522 len = strlcpy(new, local, sizeof(new)); 2523 if (len+2+1 >= sizeof(new)-1) 2524 return (-1); 2525 cp = new + len; 2526 *cp++ = '.'; 2527 for (count = 1; count < 100; count++) { 2528 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 2529 fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666); 2530 if (fd == -1) 2531 continue; 2532 if (nam) 2533 *nam = new; 2534 return (fd); 2535 } 2536 reply(452, "Unique file name cannot be created."); 2537 return (-1); 2538} 2539 2540/* 2541 * Format and send reply containing system error number. 2542 */ 2543void 2544perror_reply(code, string) 2545 int code; 2546 char *string; 2547{ 2548 2549 reply(code, "%s: %s.", string, strerror(errno)); 2550} 2551 2552static char *onefile[] = { 2553 "", 2554 0 2555}; 2556 2557void 2558send_file_list(whichf) 2559 char *whichf; 2560{ 2561 struct stat st; 2562 DIR *dirp = NULL; 2563 struct dirent *dir; 2564 FILE *dout = NULL; 2565 char **dirlist, *dirname; 2566 int simple = 0; 2567 int freeglob = 0; 2568 glob_t gl; 2569 2570 if (strpbrk(whichf, "~{[*?") != NULL) { 2571 memset(&gl, 0, sizeof(gl)); 2572 freeglob = 1; 2573 if (glob(whichf, 2574 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, 2575 0, &gl)) { 2576 reply(550, "not found"); 2577 goto out; 2578 } else if (gl.gl_pathc == 0) { 2579 errno = ENOENT; 2580 perror_reply(550, whichf); 2581 goto out; 2582 } 2583 dirlist = gl.gl_pathv; 2584 } else { 2585 onefile[0] = whichf; 2586 dirlist = onefile; 2587 simple = 1; 2588 } 2589 2590 if (setjmp(urgcatch)) { 2591 transflag = 0; 2592 goto out; 2593 } 2594 while ((dirname = *dirlist++)) { 2595 if (stat(dirname, &st) < 0) { 2596 /* 2597 * If user typed "ls -l", etc, and the client 2598 * used NLST, do what the user meant. 2599 */ 2600 if (dirname[0] == '-' && *dirlist == NULL && 2601 transflag == 0) { 2602 retrieve("/bin/ls %s", dirname); 2603 goto out; 2604 } 2605 perror_reply(550, whichf); 2606 if (dout != NULL) { 2607 (void) fclose(dout); 2608 transflag = 0; 2609 data = -1; 2610 pdata = -1; 2611 } 2612 goto out; 2613 } 2614 2615 if (S_ISREG(st.st_mode)) { 2616 if (dout == NULL) { 2617 dout = dataconn("file list", (off_t)-1, "w"); 2618 if (dout == NULL) 2619 goto out; 2620 transflag++; 2621 } 2622 fprintf(dout, "%s%s\n", dirname, 2623 type == TYPE_A ? "\r" : ""); 2624 byte_count += strlen(dirname) + 1; 2625 continue; 2626 } else if (!S_ISDIR(st.st_mode)) 2627 continue; 2628 2629 if ((dirp = opendir(dirname)) == NULL) 2630 continue; 2631 2632 while ((dir = readdir(dirp)) != NULL) { 2633 char nbuf[MAXPATHLEN]; 2634 2635 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2636 continue; 2637 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2638 dir->d_namlen == 2) 2639 continue; 2640 2641 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 2642 dir->d_name); 2643 2644 /* 2645 * We have to do a stat to insure it's 2646 * not a directory or special file. 2647 */ 2648 if (simple || (stat(nbuf, &st) == 0 && 2649 S_ISREG(st.st_mode))) { 2650 if (dout == NULL) { 2651 dout = dataconn("file list", (off_t)-1, 2652 "w"); 2653 if (dout == NULL) 2654 goto out; 2655 transflag++; 2656 } 2657 if (nbuf[0] == '.' && nbuf[1] == '/') 2658 fprintf(dout, "%s%s\n", &nbuf[2], 2659 type == TYPE_A ? "\r" : ""); 2660 else 2661 fprintf(dout, "%s%s\n", nbuf, 2662 type == TYPE_A ? "\r" : ""); 2663 byte_count += strlen(nbuf) + 1; 2664 } 2665 } 2666 (void) closedir(dirp); 2667 } 2668 2669 if (dout == NULL) 2670 reply(550, "No files found."); 2671 else if (ferror(dout) != 0) 2672 perror_reply(550, "Data connection"); 2673 else 2674 reply(226, "Transfer complete."); 2675 2676 transflag = 0; 2677 if (dout != NULL) 2678 (void) fclose(dout); 2679 else { 2680 if (pdata >= 0) 2681 close(pdata); 2682 } 2683 data = -1; 2684 pdata = -1; 2685out: 2686 if (freeglob) { 2687 freeglob = 0; 2688 globfree(&gl); 2689 } 2690} 2691 2692static void 2693reapchild(signo) 2694 int signo; 2695{ 2696 int save_errno = errno; 2697 2698 while (wait3(NULL, WNOHANG, NULL) > 0) 2699 ; 2700 errno = save_errno; 2701} 2702 2703void 2704logxfer(name, size, start) 2705 char *name; 2706 off_t size; 2707 time_t start; 2708{ 2709 char buf[400 + MAXHOSTNAMELEN*4 + MAXPATHLEN*4]; 2710 char dir[MAXPATHLEN], path[MAXPATHLEN], rpath[MAXPATHLEN]; 2711 char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; 2712 char *vpw; 2713 time_t now; 2714 int len; 2715 2716 if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) { 2717 time(&now); 2718 2719 vpw = malloc(strlen(guest ? guestpw : pw->pw_name) * 4 + 1); 2720 if (vpw == NULL) 2721 return; 2722 2723 snprintf(path, sizeof(path), "%s/%s", dir, name); 2724 if (realpath(path, rpath) == NULL) 2725 strlcpy(rpath, path, sizeof(rpath)); 2726 strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH); 2727 2728 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2729 strvis(vpw, guest? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2730 2731 len = snprintf(buf, sizeof(buf), 2732 "%.24s %d %s %qd %s %c %s %c %c %s ftp %d %s %s\n", 2733 ctime(&now), now - start + (now == start), 2734 vremotehost, (long long) size, vpath, 2735 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2736 'o', ((guest) ? 'a' : 'r'), 2737 vpw, 0 /* none yet */, 2738 ((guest) ? "*" : pw->pw_name), dhostname); 2739 if (len >= sizeof(buf)) { 2740 len = sizeof(buf); 2741 buf[sizeof(buf) - 1] = '\n'; 2742 } 2743 write(statfd, buf, len); 2744 free(vpw); 2745 } 2746} 2747 2748#if defined(TCPWRAPPERS) 2749static int 2750check_host(sa) 2751 struct sockaddr *sa; 2752{ 2753 struct sockaddr_in *sin; 2754 struct hostent *hp; 2755 char *addr; 2756 2757 if (sa->sa_family != AF_INET) 2758 return 1; /*XXX*/ 2759 2760 sin = (struct sockaddr_in *)sa; 2761 hp = gethostbyaddr((char *)&sin->sin_addr, 2762 sizeof(struct in_addr), AF_INET); 2763 addr = inet_ntoa(sin->sin_addr); 2764 if (hp) { 2765 if (!hosts_ctl("ftpd", hp->h_name, addr, STRING_UNKNOWN)) { 2766 syslog(LOG_NOTICE, "tcpwrappers rejected: %s [%s]", 2767 hp->h_name, addr); 2768 return (0); 2769 } 2770 } else { 2771 if (!hosts_ctl("ftpd", STRING_UNKNOWN, addr, STRING_UNKNOWN)) { 2772 syslog(LOG_NOTICE, "tcpwrappers rejected: [%s]", addr); 2773 return (0); 2774 } 2775 } 2776 return (1); 2777} 2778#endif /* TCPWRAPPERS */ 2779 2780/* 2781 * Allocate space and return a copy of the specified dir. 2782 * If 'dir' begins with a tilde (~), expand it. 2783 */ 2784char * 2785copy_dir(dir, pw) 2786 char *dir; 2787 struct passwd *pw; 2788{ 2789 char *cp; 2790 char *newdir; 2791 char *user = NULL; 2792 size_t dirsiz; 2793 2794 /* Nothing to expand */ 2795 if (dir[0] != '~') 2796 return (strdup(dir)); 2797 2798 /* "dir" is of form ~user/some/dir, lookup user. */ 2799 if (dir[1] != '/' && dir[1] != '\0') { 2800 if ((cp = strchr(dir + 1, '/')) == NULL) 2801 cp = dir + strlen(dir); 2802 if ((user = malloc(cp - dir)) == NULL) 2803 return (NULL); 2804 strlcpy(user, dir + 1, cp - dir); 2805 2806 /* Only do lookup if it is a different user. */ 2807 if (strcmp(user, pw->pw_name) != 0) { 2808 if ((pw = getpwnam(user)) == NULL) { 2809 /* No such user, interpret literally */ 2810 free(user); 2811 return(strdup(dir)); 2812 } 2813 } 2814 } 2815 2816 /* 2817 * If there is no directory separator (/) then it is just pw_dir. 2818 * Otherwise, replace ~foo with pw_dir. 2819 */ 2820 if ((cp = strchr(dir + 1, '/')) == NULL) { 2821 newdir = strdup(pw->pw_dir); 2822 } else { 2823 dirsiz = strlen(cp) + strlen(pw->pw_dir) + 1; 2824 if ((newdir = malloc(dirsiz)) == NULL) 2825 return (NULL); 2826 strcpy(newdir, pw->pw_dir); 2827 strcat(newdir, cp); 2828 } 2829 2830 if (user) 2831 free(user); 2832 return(newdir); 2833} 2834