ftpd.c revision 1.132
1/* $OpenBSD: ftpd.c,v 1.132 2002/07/20 17:55:45 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 const 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 const char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 75#else 76static const char rcsid[] = 77 "$OpenBSD: ftpd.c,v 1.132 2002/07/20 17:55:45 millert Exp $"; 78#endif 79#endif /* not lint */ 80 81/* 82 * FTP server. 83 */ 84#include <sys/param.h> 85#include <sys/stat.h> 86#include <sys/ioctl.h> 87#include <sys/socket.h> 88#include <sys/wait.h> 89#include <sys/mman.h> 90 91#include <netinet/in.h> 92#include <netinet/in_systm.h> 93#include <netinet/ip.h> 94#include <netinet/tcp.h> 95 96#define FTP_NAMES 97#include <arpa/ftp.h> 98#include <arpa/inet.h> 99#include <arpa/telnet.h> 100 101#include <bsd_auth.h> 102#include <ctype.h> 103#include <dirent.h> 104#include <err.h> 105#include <errno.h> 106#include <fcntl.h> 107#include <glob.h> 108#include <limits.h> 109#include <login_cap.h> 110#include <netdb.h> 111#include <pwd.h> 112#include <signal.h> 113#include <stdarg.h> 114#include <stdio.h> 115#include <stdlib.h> 116#include <string.h> 117#include <syslog.h> 118#include <time.h> 119#include <vis.h> 120#include <unistd.h> 121#include <util.h> 122#include <utmp.h> 123 124#if defined(TCPWRAPPERS) 125#include <tcpd.h> 126#endif /* TCPWRAPPERS */ 127 128#include "pathnames.h" 129#include "extern.h" 130 131static char version[] = "Version 6.5/OpenBSD"; 132 133extern off_t restart_point; 134extern char cbuf[]; 135 136union sockunion server_addr; 137union sockunion ctrl_addr; 138union sockunion data_source; 139union sockunion data_dest; 140union sockunion his_addr; 141union sockunion pasv_addr; 142 143sigset_t allsigs; 144 145int daemon_mode = 0; 146int data; 147int logged_in; 148struct passwd *pw; 149int debug = 0; 150int timeout = 900; /* timeout after 15 minutes of inactivity */ 151int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 152int logging; 153int anon_only = 0; 154int multihome = 0; 155int guest; 156int stats; 157int statfd = -1; 158int portcheck = 1; 159int dochroot; 160int type; 161int form; 162int stru; /* avoid C keyword */ 163int mode; 164int doutmp = 0; /* update utmp file */ 165int usedefault = 1; /* for data transfers */ 166int pdata = -1; /* for passive mode */ 167int family = AF_INET; 168volatile sig_atomic_t transflag; 169off_t file_size; 170off_t byte_count; 171#if !defined(CMASK) || CMASK == 0 172#undef CMASK 173#define CMASK 022 174#endif 175int defumask = CMASK; /* default umask value */ 176int umaskchange = 1; /* allow user to change umask value. */ 177char tmpline[7]; 178char hostname[MAXHOSTNAMELEN]; 179char remotehost[MAXHOSTNAMELEN]; 180char dhostname[MAXHOSTNAMELEN]; 181char *guestpw; 182static char ttyline[20]; 183char *tty = ttyline; /* for klogin */ 184static struct utmp utmp; /* for utmp */ 185static login_cap_t *lc; 186static auth_session_t *as; 187static volatile sig_atomic_t recvurg; 188 189#if defined(TCPWRAPPERS) 190int allow_severity = LOG_INFO; 191int deny_severity = LOG_NOTICE; 192#endif /* TCPWRAPPERS */ 193 194char *ident = NULL; 195 196 197int epsvall = 0; 198 199/* 200 * Timeout intervals for retrying connections 201 * to hosts that don't accept PORT cmds. This 202 * is a kludge, but given the problems with TCP... 203 */ 204#define SWAITMAX 90 /* wait at most 90 seconds */ 205#define SWAITINT 5 /* interval between retries */ 206 207int swaitmax = SWAITMAX; 208int swaitint = SWAITINT; 209 210#ifdef HASSETPROCTITLE 211char proctitle[BUFSIZ]; /* initial part of title */ 212#endif /* HASSETPROCTITLE */ 213 214#define LOGCMD(cmd, file) \ 215 if (logging > 1) \ 216 syslog(LOG_INFO,"%s %s%s", cmd, \ 217 *(file) == '/' ? "" : curdir(), file); 218#define LOGCMD2(cmd, file1, file2) \ 219 if (logging > 1) \ 220 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 221 *(file1) == '/' ? "" : curdir(), file1, \ 222 *(file2) == '/' ? "" : curdir(), file2); 223#define LOGBYTES(cmd, file, cnt) \ 224 if (logging > 1) { \ 225 if (cnt == (off_t)-1) \ 226 syslog(LOG_INFO,"%s %s%s", cmd, \ 227 *(file) == '/' ? "" : curdir(), file); \ 228 else \ 229 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 230 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 231 } 232 233static void ack(char *); 234static void sigurg(int); 235static void myoob(void); 236static int checkuser(char *, char *); 237static FILE *dataconn(char *, off_t, char *); 238static void dolog(struct sockaddr *); 239static char *copy_dir(char *, struct passwd *); 240static char *curdir(void); 241static void end_login(void); 242static FILE *getdatasock(char *); 243static int guniquefd(char *, char **); 244static void lostconn(int); 245static void sigquit(int); 246static int receive_data(FILE *, FILE *); 247static void replydirname(const char *, const char *); 248static int send_data(FILE *, FILE *, off_t, off_t, int); 249static struct passwd * 250 sgetpwnam(char *); 251static void reapchild(int); 252#if defined(TCPWRAPPERS) 253static int check_host(struct sockaddr *); 254#endif /* TCPWRAPPERS */ 255static void usage(void); 256 257void logxfer(char *, off_t, time_t); 258 259static char * 260curdir() 261{ 262 static char path[MAXPATHLEN+1]; /* path + '/' */ 263 264 if (getcwd(path, sizeof(path)-1) == NULL) 265 return (""); 266 if (path[1] != '\0') /* special case for root dir. */ 267 strlcat(path, "/", sizeof path); 268 /* For guest account, skip / since it's chrooted */ 269 return (guest ? path+1 : path); 270} 271 272char *argstr = "AdDhlMSt:T:u:UvP46"; 273 274static void 275usage() 276{ 277 syslog(LOG_ERR, 278 "usage: ftpd [-AdDhlMPSU46] [-t timeout] [-T maxtimeout] [-u mask]"); 279 exit(2); 280} 281 282int 283main(argc, argv, envp) 284 int argc; 285 char *argv[]; 286 char **envp; 287{ 288 socklen_t addrlen; 289 int ch, on = 1, tos; 290 char *cp, line[LINE_MAX]; 291 FILE *fp; 292 struct hostent *hp; 293 struct sigaction sa; 294 295 tzset(); /* in case no timezone database in ~ftp */ 296 sigfillset(&allsigs); /* used to block signals while root */ 297 sigemptyset(&sa.sa_mask); 298 sa.sa_flags = SA_RESTART; 299 300 while ((ch = getopt(argc, argv, argstr)) != -1) { 301 switch (ch) { 302 case 'A': 303 anon_only = 1; 304 break; 305 306 case 'd': 307 case 'v': /* deprecated */ 308 debug = 1; 309 break; 310 311 case 'D': 312 daemon_mode = 1; 313 break; 314 315 case 'P': 316 portcheck = 0; 317 break; 318 319 case 'h': /* deprecated */ 320 break; 321 322 case 'l': 323 logging++; /* > 1 == extra logging */ 324 break; 325 326 case 'M': 327 multihome = 1; 328 break; 329 330 case 'S': 331 stats = 1; 332 break; 333 334 case 't': 335 timeout = atoi(optarg); 336 if (maxtimeout < timeout) 337 maxtimeout = timeout; 338 break; 339 340 case 'T': 341 maxtimeout = atoi(optarg); 342 if (timeout > maxtimeout) 343 timeout = maxtimeout; 344 break; 345 346 case 'u': 347 { 348 long val = 0; 349 char *p; 350 umaskchange = 0; 351 352 val = strtol(optarg, &p, 8); 353 if (*p != '\0' || val < 0 || (val & ~ACCESSPERMS)) { 354 syslog(LOG_ERR, 355 "ftpd: %s is a bad value for -u, aborting..", 356 optarg); 357 exit(2); 358 } else 359 defumask = val; 360 break; 361 } 362 363 case 'U': 364 doutmp = 1; 365 break; 366 367 case '4': 368 family = AF_INET; 369 break; 370 371 case '6': 372 family = AF_INET6; 373 break; 374 375 default: 376 usage(); 377 break; 378 } 379 } 380 381 (void) freopen(_PATH_DEVNULL, "w", stderr); 382 383 /* 384 * LOG_NDELAY sets up the logging connection immediately, 385 * necessary for anonymous ftp's that chroot and can't do it later. 386 */ 387 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 388 389 if (daemon_mode) { 390 int ctl_sock, fd; 391 struct servent *sv; 392 393 /* 394 * Detach from parent. 395 */ 396 if (daemon(1, 1) < 0) { 397 syslog(LOG_ERR, "failed to become a daemon"); 398 exit(1); 399 } 400 sa.sa_handler = reapchild; 401 (void) sigaction(SIGCHLD, &sa, NULL); 402 /* 403 * Get port number for ftp/tcp. 404 */ 405 sv = getservbyname("ftp", "tcp"); 406 if (sv == NULL) { 407 syslog(LOG_ERR, "getservbyname for ftp failed"); 408 exit(1); 409 } 410 /* 411 * Open a socket, bind it to the FTP port, and start 412 * listening. 413 */ 414 ctl_sock = socket(family, SOCK_STREAM, 0); 415 if (ctl_sock < 0) { 416 syslog(LOG_ERR, "control socket: %m"); 417 exit(1); 418 } 419 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 420 (char *)&on, sizeof(on)) < 0) 421 syslog(LOG_ERR, "control setsockopt: %m"); 422 memset(&server_addr, 0, sizeof(server_addr)); 423 server_addr.su_sin.sin_family = family; 424 switch (family) { 425 case AF_INET: 426 server_addr.su_len = sizeof(struct sockaddr_in); 427 server_addr.su_sin.sin_port = sv->s_port; 428 break; 429 case AF_INET6: 430 server_addr.su_len = sizeof(struct sockaddr_in6); 431 server_addr.su_sin6.sin6_port = sv->s_port; 432 break; 433 } 434 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 435 server_addr.su_len)) { 436 syslog(LOG_ERR, "control bind: %m"); 437 exit(1); 438 } 439 if (listen(ctl_sock, 32) < 0) { 440 syslog(LOG_ERR, "control listen: %m"); 441 exit(1); 442 } 443 /* Stash pid in pidfile */ 444 if (pidfile(NULL)) 445 syslog(LOG_ERR, "can't open pidfile: %m"); 446 /* 447 * Loop forever accepting connection requests and forking off 448 * children to handle them. 449 */ 450 while (1) { 451 addrlen = sizeof(his_addr); 452 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, 453 &addrlen); 454 if (fork() == 0) { 455 /* child */ 456 (void) dup2(fd, 0); 457 (void) dup2(fd, 1); 458 close(ctl_sock); 459 break; 460 } 461 close(fd); 462 } 463 464#if defined(TCPWRAPPERS) 465 /* ..in the child. */ 466 if (!check_host((struct sockaddr *)&his_addr)) 467 exit(1); 468#endif /* TCPWRAPPERS */ 469 } else { 470 addrlen = sizeof(his_addr); 471 if (getpeername(0, (struct sockaddr *)&his_addr, 472 &addrlen) < 0) { 473 /* syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); */ 474 exit(1); 475 } 476 } 477 478 /* set this here so klogin can use it... */ 479 (void)snprintf(ttyline, sizeof(ttyline), "ftp%ld", (long)getpid()); 480 481 sa.sa_handler = SIG_DFL; 482 (void) sigaction(SIGCHLD, &sa, NULL); 483 484 sa.sa_handler = sigurg; 485 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 486 (void) sigaction(SIGURG, &sa, NULL); 487 488 sigfillset(&sa.sa_mask); /* block all signals in handler */ 489 sa.sa_flags = SA_RESTART; 490 sa.sa_handler = sigquit; 491 (void) sigaction(SIGHUP, &sa, NULL); 492 (void) sigaction(SIGINT, &sa, NULL); 493 (void) sigaction(SIGQUIT, &sa, NULL); 494 (void) sigaction(SIGTERM, &sa, NULL); 495 496 sa.sa_handler = lostconn; 497 (void) sigaction(SIGPIPE, &sa, NULL); 498 499 sa.sa_handler = toolong; 500 (void) sigaction(SIGALRM, &sa, NULL); 501 502 addrlen = sizeof(ctrl_addr); 503 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 504 syslog(LOG_ERR, "getsockname: %m"); 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 strlcpy(hostname, hp->h_name, sizeof(hostname)); 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 for (;;) 615 (void) yyparse(); 616 /* NOTREACHED */ 617} 618 619/* 620 * Signal handlers. 621 */ 622 623static void 624lostconn(signo) 625 int signo; 626{ 627 struct syslog_data sdata = SYSLOG_DATA_INIT; 628 629 if (debug) 630 syslog_r(LOG_DEBUG, &sdata, "lost connection"); 631 dologout(1); 632} 633 634static void 635sigquit(signo) 636 int signo; 637{ 638 struct syslog_data sdata = SYSLOG_DATA_INIT; 639 640 syslog_r(LOG_ERR, &sdata, "got signal %s", sys_signame[signo]); 641 dologout(1); 642} 643 644/* 645 * Save the result of a getpwnam. Used for USER command, since 646 * the data returned must not be clobbered by any other command 647 * (e.g., globbing). 648 */ 649static struct passwd * 650sgetpwnam(name) 651 char *name; 652{ 653 static struct passwd *save; 654 struct passwd *pw; 655 656 if ((pw = getpwnam(name)) == NULL) 657 return (NULL); 658 if (save) { 659 memset(save->pw_passwd, 0, strlen(save->pw_passwd)); 660 free(save); 661 } 662 save = pw_dup(pw); 663 if (save == NULL) { 664 perror_reply(421, "Local resource failure: malloc"); 665 dologout(1); 666 /* NOTREACHED */ 667 } 668 return (save); 669} 670 671static int login_attempts; /* number of failed login attempts */ 672static int askpasswd; /* had user command, ask for passwd */ 673static char curname[MAXLOGNAME]; /* current USER name */ 674 675/* 676 * USER command. 677 * Sets global passwd pointer pw if named account exists and is acceptable; 678 * sets askpasswd if a PASS command is expected. If logged in previously, 679 * need to reset state. If name is "ftp" or "anonymous", the name is not in 680 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 681 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 682 * requesting login privileges. Disallow anyone who does not have a standard 683 * shell as returned by getusershell(). Disallow anyone mentioned in the file 684 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 685 */ 686void 687user(name) 688 char *name; 689{ 690 char *cp, *shell, *style, *host; 691 char *class = NULL; 692 693 if (logged_in) { 694 if (guest) { 695 reply(530, "Can't change user from guest login."); 696 return; 697 } else if (dochroot) { 698 reply(530, "Can't change user from chroot user."); 699 return; 700 } 701 end_login(); 702 } 703 704 /* Close session from previous user if there was one. */ 705 if (as) { 706 auth_close(as); 707 as = NULL; 708 } 709 if (lc) { 710 login_close(lc); 711 lc = NULL; 712 } 713 714 if ((style = strchr(name, ':')) != NULL) 715 *style++ = 0; 716 717 guest = 0; 718 host = multihome ? dhostname : hostname; 719 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 720 if (checkuser(_PATH_FTPUSERS, "ftp") || 721 checkuser(_PATH_FTPUSERS, "anonymous")) 722 reply(530, "User %s access denied.", name); 723 else if ((pw = sgetpwnam("ftp")) != NULL) { 724 guest = 1; 725 askpasswd = 1; 726 lc = login_getclass(pw->pw_class); 727 if ((as = auth_open()) == NULL || 728 auth_setpwd(as, pw) != 0 || 729 auth_setoption(as, "FTPD_HOST", host) < 0) { 730 if (as) { 731 auth_close(as); 732 as = NULL; 733 } 734 login_close(lc); 735 lc = NULL; 736 reply(421, "Local resource failure"); 737 return; 738 } 739 reply(331, 740 "Guest login ok, send your email address as password."); 741 } else 742 reply(530, "User %s unknown.", name); 743 if (!askpasswd && logging) 744 syslog(LOG_NOTICE, 745 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 746 return; 747 } 748 749 shell = _PATH_BSHELL; 750 if ((pw = sgetpwnam(name))) { 751 class = pw->pw_class; 752 if (pw->pw_shell != NULL && *pw->pw_shell != '\0') 753 shell = pw->pw_shell; 754 while ((cp = getusershell()) != NULL) 755 if (strcmp(cp, shell) == 0) 756 break; 757 shell = cp; 758 endusershell(); 759 } 760 761 /* Get login class; if invalid style treat like unknown user. */ 762 lc = login_getclass(class); 763 if (lc && (style = login_getstyle(lc, style, "auth-ftp")) == NULL) { 764 login_close(lc); 765 lc = NULL; 766 pw = NULL; 767 } 768 769 /* Do pre-authentication setup. */ 770 if (lc && ((as = auth_open()) == NULL || 771 (pw != NULL && auth_setpwd(as, pw) != 0) || 772 auth_setitem(as, AUTHV_STYLE, style) < 0 || 773 auth_setitem(as, AUTHV_NAME, name) < 0 || 774 auth_setitem(as, AUTHV_CLASS, class) < 0 || 775 auth_setoption(as, "login", "yes") < 0 || 776 auth_setoption(as, "notickets", "yes") < 0 || 777 auth_setoption(as, "FTPD_HOST", host) < 0)) { 778 if (as) { 779 auth_close(as); 780 as = NULL; 781 } 782 login_close(lc); 783 lc = NULL; 784 reply(421, "Local resource failure"); 785 return; 786 } 787 if (logging) 788 strlcpy(curname, name, sizeof(curname)); 789 790 dochroot = (lc && login_getcapbool(lc, "ftp-chroot", 0)) || 791 checkuser(_PATH_FTPCHROOT, name); 792 if (anon_only && !dochroot) { 793 reply(530, "Sorry, only anonymous ftp allowed."); 794 return; 795 } 796 if (pw) { 797 if ((!shell && !dochroot) || checkuser(_PATH_FTPUSERS, name)) { 798 reply(530, "User %s access denied.", name); 799 if (logging) 800 syslog(LOG_NOTICE, 801 "FTP LOGIN REFUSED FROM %s, %s", 802 remotehost, name); 803 pw = NULL; 804 return; 805 } 806 } 807 808 if (as != NULL && (cp = auth_challenge(as)) != NULL) 809 reply(331, cp); 810 else 811 reply(331, "Password required for %s.", name); 812 813 askpasswd = 1; 814 /* 815 * Delay before reading passwd after first failed 816 * attempt to slow down passwd-guessing programs. 817 */ 818 if (login_attempts) 819 sleep((unsigned) login_attempts); 820} 821 822/* 823 * Check if a user is in the file "fname" 824 */ 825static int 826checkuser(fname, name) 827 char *fname; 828 char *name; 829{ 830 FILE *fp; 831 int found = 0; 832 char *p, line[BUFSIZ]; 833 834 if ((fp = fopen(fname, "r")) != NULL) { 835 while (fgets(line, sizeof(line), fp) != NULL) 836 if ((p = strchr(line, '\n')) != NULL) { 837 *p = '\0'; 838 if (line[0] == '#') 839 continue; 840 if (strcmp(line, name) == 0) { 841 found = 1; 842 break; 843 } 844 } 845 (void) fclose(fp); 846 } 847 return (found); 848} 849 850/* 851 * Terminate login as previous user, if any, resetting state; 852 * used when USER command is given or login fails. 853 */ 854static void 855end_login() 856{ 857 858 sigprocmask (SIG_BLOCK, &allsigs, NULL); 859 (void) seteuid((uid_t)0); 860 if (logged_in) { 861 ftpdlogwtmp(ttyline, "", ""); 862 if (doutmp) 863 logout(utmp.ut_line); 864 } 865 pw = NULL; 866 /* umask is restored in ftpcmd.y */ 867 if (setusercontext(NULL, getpwuid(0), (uid_t)0, 868 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES) != 0) { 869 perror_reply(451, "Local resource failure: setusercontext"); 870 syslog(LOG_NOTICE, "setusercontext: %p"); 871 exit(1); 872 } 873 logged_in = 0; 874 guest = 0; 875 dochroot = 0; 876} 877 878void 879pass(passwd) 880 char *passwd; 881{ 882 int authok, flags; 883 FILE *fp; 884 static char homedir[MAXPATHLEN]; 885 char *motd, *dir, rootdir[MAXPATHLEN]; 886 887 if (logged_in || askpasswd == 0) { 888 reply(503, "Login with USER first."); 889 return; 890 } 891 askpasswd = 0; 892 if (!guest) { /* "ftp" is only account allowed no password */ 893 authok = 0; 894 if (pw == NULL || pw->pw_passwd[0] == '\0') { 895 useconds_t us; 896 897 /* Sleep between 1 and 3 seconds to emulate a crypt. */ 898 us = arc4random() % 3000000; 899 usleep(us); 900 if (as != NULL) { 901 auth_close(as); 902 as = NULL; 903 } 904 } else { 905 authok = auth_userresponse(as, passwd, 0); 906 as = NULL; 907 } 908 if (authok == 0) { 909 reply(530, "Login incorrect."); 910 if (logging) 911 syslog(LOG_NOTICE, 912 "FTP LOGIN FAILED FROM %s, %s", 913 remotehost, curname); 914 pw = NULL; 915 if (login_attempts++ >= 5) { 916 syslog(LOG_NOTICE, 917 "repeated login failures from %s", 918 remotehost); 919 exit(0); 920 } 921 return; 922 } 923 } else if (lc != NULL) { 924 /* Save anonymous' password. */ 925 if (guestpw != NULL) 926 free(guestpw); 927 guestpw = strdup(passwd); 928 if (guestpw == NULL) 929 fatal("Out of memory."); 930 931 authok = auth_approval(as, lc, pw->pw_name, "ftp"); 932 auth_close(as); 933 as = NULL; 934 if (authok == 0) { 935 syslog(LOG_INFO|LOG_AUTH, 936 "FTP LOGIN FAILED (HOST) as %s: approval failure.", 937 pw->pw_name); 938 reply(530, "Approval failure."); 939 exit(0); 940 } 941 } else { 942 syslog(LOG_INFO|LOG_AUTH, 943 "FTP LOGIN CLASS %s MISSING for %s: approval failure.", 944 pw->pw_class, pw->pw_name); 945 reply(530, "Permission denied."); 946 exit(0); 947 } 948 login_attempts = 0; /* this time successful */ 949 if (setegid((gid_t)pw->pw_gid) < 0) { 950 reply(550, "Can't set gid."); 951 return; 952 } 953 /* set umask via setusercontext() unless -u flag was given. */ 954 flags = LOGIN_SETGROUP|LOGIN_SETPRIORITY|LOGIN_SETRESOURCES; 955 if (umaskchange) 956 flags |= LOGIN_SETUMASK; 957 else 958 (void) umask(defumask); 959 if (setusercontext(lc, pw, (uid_t)0, flags) != 0) { 960 perror_reply(451, "Local resource failure: setusercontext"); 961 syslog(LOG_NOTICE, "setusercontext: %p"); 962 dologout(1); 963 /* NOTREACHED */ 964 } 965 966 /* open wtmp before chroot */ 967 ftpdlogwtmp(ttyline, pw->pw_name, remotehost); 968 969 /* open utmp before chroot */ 970 if (doutmp) { 971 memset((void *)&utmp, 0, sizeof(utmp)); 972 (void)time(&utmp.ut_time); 973 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 974 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 975 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 976 login(&utmp); 977 } 978 979 /* open stats file before chroot */ 980 if (guest && (stats == 1) && (statfd < 0)) 981 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 982 stats = 0; 983 984 logged_in = 1; 985 986 if ((dir = login_getcapstr(lc, "ftp-dir", NULL, NULL))) { 987 char *newdir; 988 989 newdir = copy_dir(dir, pw); 990 if (newdir == NULL) { 991 perror_reply(421, "Local resource failure: malloc"); 992 dologout(1); 993 /* NOTREACHED */ 994 } 995 free(dir); 996 free(pw->pw_dir); 997 pw->pw_dir = newdir; 998 } 999 1000 /* make sure pw->pw_dir is big enough to hold "/" */ 1001 if (strlen(pw->pw_dir) < 1) { 1002 char *newdir; 1003 1004 newdir = malloc(2); 1005 if (newdir == NULL) { 1006 perror_reply(421, "Local resource failure: malloc"); 1007 dologout(1); 1008 /* NOTREACHED */ 1009 } 1010 strlcpy(newdir, pw->pw_dir, 2); 1011 free(pw->pw_dir); 1012 pw->pw_dir = newdir; 1013 } 1014 1015 if (guest || dochroot) { 1016 if (multihome && guest) { 1017 struct stat ts; 1018 1019 /* Compute root directory. */ 1020 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1021 pw->pw_dir, dhostname); 1022 if (stat(rootdir, &ts) < 0) { 1023 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1024 pw->pw_dir, hostname); 1025 } 1026 } else 1027 strlcpy(rootdir, pw->pw_dir, sizeof(rootdir)); 1028 } 1029 if (guest) { 1030 /* 1031 * We MUST do a chdir() after the chroot. Otherwise 1032 * the old current directory will be accessible as "." 1033 * outside the new root! 1034 */ 1035 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1036 reply(550, "Can't set guest privileges."); 1037 goto bad; 1038 } 1039 strcpy(pw->pw_dir, "/"); 1040 if (setenv("HOME", "/", 1) == -1) { 1041 reply(550, "Can't setup environment."); 1042 goto bad; 1043 } 1044 } else if (dochroot) { 1045 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1046 reply(550, "Can't change root."); 1047 goto bad; 1048 } 1049 strcpy(pw->pw_dir, "/"); 1050 if (setenv("HOME", "/", 1) == -1) { 1051 reply(550, "Can't setup environment."); 1052 goto bad; 1053 } 1054 } else if (chdir(pw->pw_dir) < 0) { 1055 if (chdir("/") < 0) { 1056 reply(530, "User %s: can't change directory to %s.", 1057 pw->pw_name, pw->pw_dir); 1058 goto bad; 1059 } else 1060 lreply(230, "No directory! Logging in with home=/"); 1061 } 1062 if (seteuid((uid_t)pw->pw_uid) < 0) { 1063 reply(550, "Can't set uid."); 1064 goto bad; 1065 } 1066 sigprocmask(SIG_UNBLOCK, &allsigs, NULL); 1067 1068 /* 1069 * Set home directory so that use of ~ (tilde) works correctly. 1070 */ 1071 if (getcwd(homedir, MAXPATHLEN) != NULL) { 1072 if (setenv("HOME", homedir, 1) == -1) { 1073 reply(550, "Can't setup environment."); 1074 goto bad; 1075 } 1076 } 1077 1078 /* 1079 * Display a login message, if it exists. 1080 * N.B. reply(230,) must follow the message. 1081 */ 1082 motd = login_getcapstr(lc, "welcome", NULL, NULL); 1083 if ((fp = fopen(motd ? motd : _PATH_FTPLOGINMESG, "r")) != NULL) { 1084 char *cp, line[LINE_MAX]; 1085 1086 while (fgets(line, sizeof(line), fp) != NULL) { 1087 if ((cp = strchr(line, '\n')) != NULL) 1088 *cp = '\0'; 1089 lreply(230, "%s", line); 1090 } 1091 (void) fflush(stdout); 1092 (void) fclose(fp); 1093 } 1094 if (motd != NULL) 1095 free(motd); 1096 if (guest) { 1097 if (ident != NULL) 1098 free(ident); 1099 ident = strdup(passwd); 1100 if (ident == NULL) 1101 fatal("Ran out of memory."); 1102 reply(230, "Guest login ok, access restrictions apply."); 1103#ifdef HASSETPROCTITLE 1104 snprintf(proctitle, sizeof(proctitle), 1105 "%s: anonymous/%.*s", remotehost, 1106 (int)(sizeof(proctitle) - sizeof(remotehost) - 1107 sizeof(": anonymous/")), passwd); 1108 setproctitle("%s", proctitle); 1109#endif /* HASSETPROCTITLE */ 1110 if (logging) 1111 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1112 remotehost, passwd); 1113 } else { 1114 reply(230, "User %s logged in.", pw->pw_name); 1115#ifdef HASSETPROCTITLE 1116 snprintf(proctitle, sizeof(proctitle), 1117 "%s: %s", remotehost, pw->pw_name); 1118 setproctitle("%s", proctitle); 1119#endif /* HASSETPROCTITLE */ 1120 if (logging) 1121 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1122 remotehost, pw->pw_name); 1123 } 1124 login_close(lc); 1125 lc = NULL; 1126 return; 1127bad: 1128 /* Forget all about it... */ 1129 login_close(lc); 1130 lc = NULL; 1131 end_login(); 1132} 1133 1134void 1135retrieve(cmd, name) 1136 char *cmd, *name; 1137{ 1138 FILE *fin, *dout; 1139 struct stat st; 1140 int (*closefunc)(FILE *); 1141 time_t start; 1142 1143 if (cmd == 0) { 1144 fin = fopen(name, "r"), closefunc = fclose; 1145 st.st_size = 0; 1146 } else { 1147 char line[BUFSIZ]; 1148 1149 (void) snprintf(line, sizeof(line), cmd, name); 1150 name = line; 1151 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1152 st.st_size = -1; 1153 st.st_blksize = BUFSIZ; 1154 } 1155 if (fin == NULL) { 1156 if (errno != 0) { 1157 perror_reply(550, name); 1158 if (cmd == 0) { 1159 LOGCMD("get", name); 1160 } 1161 } 1162 return; 1163 } 1164 byte_count = -1; 1165 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1166 reply(550, "%s: not a plain file.", name); 1167 goto done; 1168 } 1169 if (restart_point) { 1170 if (type == TYPE_A) { 1171 off_t i, n; 1172 int c; 1173 1174 n = restart_point; 1175 i = 0; 1176 while (i++ < n) { 1177 if ((c=getc(fin)) == EOF) { 1178 perror_reply(550, name); 1179 goto done; 1180 } 1181 if (c == '\n') 1182 i++; 1183 } 1184 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1185 perror_reply(550, name); 1186 goto done; 1187 } 1188 } 1189 dout = dataconn(name, st.st_size, "w"); 1190 if (dout == NULL) 1191 goto done; 1192 time(&start); 1193 send_data(fin, dout, st.st_blksize, st.st_size, 1194 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 1195 if ((cmd == 0) && stats) 1196 logxfer(name, byte_count, start); 1197 (void) fclose(dout); 1198 data = -1; 1199done: 1200 if (pdata >= 0) 1201 (void) close(pdata); 1202 pdata = -1; 1203 if (cmd == 0) 1204 LOGBYTES("get", name, byte_count); 1205 (*closefunc)(fin); 1206} 1207 1208void 1209store(name, mode, unique) 1210 char *name, *mode; 1211 int unique; 1212{ 1213 FILE *fout, *din; 1214 int (*closefunc)(FILE *); 1215 struct stat st; 1216 int fd; 1217 1218 if (restart_point && *mode != 'a') 1219 mode = "r+"; 1220 1221 if (unique && stat(name, &st) == 0) { 1222 char *nam; 1223 1224 fd = guniquefd(name, &nam); 1225 if (fd == -1) { 1226 LOGCMD(*mode == 'w' ? "put" : "append", name); 1227 return; 1228 } 1229 name = nam; 1230 fout = fdopen(fd, mode); 1231 } else 1232 fout = fopen(name, mode); 1233 1234 closefunc = fclose; 1235 if (fout == NULL) { 1236 perror_reply(553, name); 1237 LOGCMD(*mode == 'w' ? "put" : "append", name); 1238 return; 1239 } 1240 byte_count = -1; 1241 if (restart_point) { 1242 if (type == TYPE_A) { 1243 off_t i, n; 1244 int c; 1245 1246 n = restart_point; 1247 i = 0; 1248 while (i++ < n) { 1249 if ((c=getc(fout)) == EOF) { 1250 perror_reply(550, name); 1251 goto done; 1252 } 1253 if (c == '\n') 1254 i++; 1255 } 1256 /* 1257 * We must do this seek to "current" position 1258 * because we are changing from reading to 1259 * writing. 1260 */ 1261 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1262 perror_reply(550, name); 1263 goto done; 1264 } 1265 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1266 perror_reply(550, name); 1267 goto done; 1268 } 1269 } 1270 din = dataconn(name, (off_t)-1, "r"); 1271 if (din == NULL) 1272 goto done; 1273 if (receive_data(din, fout) == 0) { 1274 if (unique) 1275 reply(226, "Transfer complete (unique file name:%s).", 1276 name); 1277 else 1278 reply(226, "Transfer complete."); 1279 } 1280 (void) fclose(din); 1281 data = -1; 1282 pdata = -1; 1283done: 1284 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1285 (*closefunc)(fout); 1286} 1287 1288static FILE * 1289getdatasock(mode) 1290 char *mode; 1291{ 1292 int on = 1, s, t, tries; 1293 1294 if (data >= 0) 1295 return (fdopen(data, mode)); 1296 sigprocmask (SIG_BLOCK, &allsigs, NULL); 1297 (void) seteuid((uid_t)0); 1298 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1299 if (s < 0) 1300 goto bad; 1301 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1302 (char *) &on, sizeof(on)) < 0) 1303 goto bad; 1304 /* anchor socket to avoid multi-homing problems */ 1305 data_source = ctrl_addr; 1306 data_source.su_port = htons(20); /* ftp-data port */ 1307 for (tries = 1; ; tries++) { 1308 if (bind(s, (struct sockaddr *)&data_source, 1309 data_source.su_len) >= 0) 1310 break; 1311 if (errno != EADDRINUSE || tries > 10) 1312 goto bad; 1313 sleep(tries); 1314 } 1315 (void) seteuid((uid_t)pw->pw_uid); 1316 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1317 1318#ifdef IP_TOS 1319 if (ctrl_addr.su_family == AF_INET) { 1320 on = IPTOS_THROUGHPUT; 1321 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1322 sizeof(int)) < 0) 1323 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1324 } 1325#endif 1326#ifdef TCP_NOPUSH 1327 /* 1328 * Turn off push flag to keep sender TCP from sending short packets 1329 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1330 * to set the send buffer size as well, but that may not be desirable 1331 * in heavy-load situations. 1332 */ 1333 on = 1; 1334 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof(on)) < 0) 1335 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1336#endif 1337#ifdef SO_SNDBUF 1338 on = 65536; 1339 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof(on)) < 0) 1340 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1341#endif 1342 1343 return (fdopen(s, mode)); 1344bad: 1345 /* Return the real value of errno (close may change it) */ 1346 t = errno; 1347 (void) seteuid((uid_t)pw->pw_uid); 1348 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1349 (void) close(s); 1350 errno = t; 1351 return (NULL); 1352} 1353 1354static FILE * 1355dataconn(name, size, mode) 1356 char *name; 1357 off_t size; 1358 char *mode; 1359{ 1360 char sizebuf[32]; 1361 FILE *file; 1362 int retry = 0; 1363 in_port_t *p; 1364 u_char *fa, *ha; 1365 int alen; 1366 1367 file_size = size; 1368 byte_count = 0; 1369 if (size != (off_t) -1) { 1370 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1371 size); 1372 } else 1373 sizebuf[0] = '\0'; 1374 if (pdata >= 0) { 1375 union sockunion from; 1376 int s; 1377 socklen_t fromlen = sizeof(from); 1378 1379 (void) alarm ((unsigned) timeout); 1380 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1381 (void) alarm (0); 1382 if (s < 0) { 1383 reply(425, "Can't open data connection."); 1384 (void) close(pdata); 1385 pdata = -1; 1386 return (NULL); 1387 } 1388 switch (from.su_family) { 1389 case AF_INET: 1390 p = (in_port_t *)&from.su_sin.sin_port; 1391 fa = (u_char *)&from.su_sin.sin_addr; 1392 ha = (u_char *)&his_addr.su_sin.sin_addr; 1393 alen = sizeof(struct in_addr); 1394 break; 1395 case AF_INET6: 1396 p = (in_port_t *)&from.su_sin6.sin6_port; 1397 fa = (u_char *)&from.su_sin6.sin6_addr; 1398 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1399 alen = sizeof(struct in6_addr); 1400 break; 1401 default: 1402 perror_reply(425, "Can't build data connection"); 1403 (void) close(pdata); 1404 (void) close(s); 1405 pdata = -1; 1406 return (NULL); 1407 } 1408 if (from.su_family != his_addr.su_family || 1409 ntohs(*p) < IPPORT_RESERVED) { 1410 perror_reply(425, "Can't build data connection"); 1411 (void) close(pdata); 1412 (void) close(s); 1413 pdata = -1; 1414 return (NULL); 1415 } 1416 if (portcheck && memcmp(fa, ha, alen) != 0) { 1417 perror_reply(435, "Can't build data connection"); 1418 (void) close(pdata); 1419 (void) close(s); 1420 pdata = -1; 1421 return (NULL); 1422 } 1423 (void) close(pdata); 1424 pdata = s; 1425 reply(150, "Opening %s mode data connection for '%s'%s.", 1426 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1427 return (fdopen(pdata, mode)); 1428 } 1429 if (data >= 0) { 1430 reply(125, "Using existing data connection for '%s'%s.", 1431 name, sizebuf); 1432 usedefault = 1; 1433 return (fdopen(data, mode)); 1434 } 1435 if (usedefault) 1436 data_dest = his_addr; 1437 usedefault = 1; 1438 file = getdatasock(mode); 1439 if (file == NULL) { 1440 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1441 1442 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1443 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1444 NI_NUMERICHOST | NI_NUMERICSERV); 1445 reply(425, "Can't create data socket (%s,%s): %s.", 1446 hbuf, pbuf, strerror(errno)); 1447 return (NULL); 1448 } 1449 data = fileno(file); 1450 1451 /* 1452 * attempt to connect to reserved port on client machine; 1453 * this looks like an attack 1454 */ 1455 switch (data_dest.su_family) { 1456 case AF_INET: 1457 p = (in_port_t *)&data_dest.su_sin.sin_port; 1458 fa = (u_char *)&data_dest.su_sin.sin_addr; 1459 ha = (u_char *)&his_addr.su_sin.sin_addr; 1460 alen = sizeof(struct in_addr); 1461 break; 1462 case AF_INET6: 1463 p = (in_port_t *)&data_dest.su_sin6.sin6_port; 1464 fa = (u_char *)&data_dest.su_sin6.sin6_addr; 1465 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1466 alen = sizeof(struct in6_addr); 1467 break; 1468 default: 1469 perror_reply(425, "Can't build data connection"); 1470 (void) fclose(file); 1471 pdata = -1; 1472 return (NULL); 1473 } 1474 if (data_dest.su_family != his_addr.su_family || 1475 ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */ 1476 perror_reply(425, "Can't build data connection"); 1477 (void) fclose(file); 1478 data = -1; 1479 return NULL; 1480 } 1481 if (portcheck && memcmp(fa, ha, alen) != 0) { 1482 perror_reply(435, "Can't build data connection"); 1483 (void) fclose(file); 1484 data = -1; 1485 return NULL; 1486 } 1487 while (connect(data, (struct sockaddr *)&data_dest, 1488 data_dest.su_len) < 0) { 1489 if (errno == EADDRINUSE && retry < swaitmax) { 1490 sleep((unsigned) swaitint); 1491 retry += swaitint; 1492 continue; 1493 } 1494 perror_reply(425, "Can't build data connection"); 1495 (void) fclose(file); 1496 data = -1; 1497 return (NULL); 1498 } 1499 reply(150, "Opening %s mode data connection for '%s'%s.", 1500 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1501 return (file); 1502} 1503 1504/* 1505 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1506 * encapsulation of the data subject to Mode, Structure, and Type. 1507 * 1508 * NB: Form isn't handled. 1509 */ 1510static int 1511send_data(instr, outstr, blksize, filesize, isreg) 1512 FILE *instr, *outstr; 1513 off_t blksize; 1514 off_t filesize; 1515 int isreg; 1516{ 1517 int c, cnt, filefd, netfd; 1518 char *buf, *bp; 1519 size_t len; 1520 1521 transflag++; 1522 switch (type) { 1523 1524 case TYPE_A: 1525 while ((c = getc(instr)) != EOF) { 1526 if (recvurg) 1527 goto got_oob; 1528 byte_count++; 1529 if (c == '\n') { 1530 if (ferror(outstr)) 1531 goto data_err; 1532 (void) putc('\r', outstr); 1533 } 1534 (void) putc(c, outstr); 1535 } 1536 fflush(outstr); 1537 transflag = 0; 1538 if (ferror(instr)) 1539 goto file_err; 1540 if (ferror(outstr)) 1541 goto data_err; 1542 reply(226, "Transfer complete."); 1543 return(0); 1544 1545 case TYPE_I: 1546 case TYPE_L: 1547 /* 1548 * isreg is only set if we are not doing restart and we 1549 * are sending a regular file 1550 */ 1551 netfd = fileno(outstr); 1552 filefd = fileno(instr); 1553 1554 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1555 buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd, 1556 (off_t)0); 1557 if (buf == MAP_FAILED) { 1558 syslog(LOG_WARNING, "mmap(%lu): %m", 1559 (unsigned long)filesize); 1560 goto oldway; 1561 } 1562 bp = buf; 1563 len = filesize; 1564 do { 1565 cnt = write(netfd, bp, len); 1566 if (recvurg) { 1567 munmap(buf, (size_t)filesize); 1568 goto got_oob; 1569 } 1570 len -= cnt; 1571 bp += cnt; 1572 if (cnt > 0) byte_count += cnt; 1573 } while(cnt > 0 && len > 0); 1574 1575 transflag = 0; 1576 munmap(buf, (size_t)filesize); 1577 if (cnt < 0) 1578 goto data_err; 1579 reply(226, "Transfer complete."); 1580 return(0); 1581 } 1582 1583oldway: 1584 if ((buf = malloc((u_int)blksize)) == NULL) { 1585 transflag = 0; 1586 perror_reply(451, "Local resource failure: malloc"); 1587 return(-1); 1588 } 1589 1590 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1591 write(netfd, buf, cnt) == cnt) 1592 byte_count += cnt; 1593 transflag = 0; 1594 (void)free(buf); 1595 if (cnt != 0) { 1596 if (cnt < 0) 1597 goto file_err; 1598 goto data_err; 1599 } 1600 reply(226, "Transfer complete."); 1601 return(0); 1602 default: 1603 transflag = 0; 1604 reply(550, "Unimplemented TYPE %d in send_data", type); 1605 return(-1); 1606 } 1607 1608data_err: 1609 transflag = 0; 1610 perror_reply(426, "Data connection"); 1611 return(-1); 1612 1613file_err: 1614 transflag = 0; 1615 perror_reply(551, "Error on input file"); 1616 return(-1); 1617 1618got_oob: 1619 myoob(); 1620 recvurg = 0; 1621 transflag = 0; 1622 return(-1); 1623} 1624 1625/* 1626 * Transfer data from peer to "outstr" using the appropriate encapulation of 1627 * the data subject to Mode, Structure, and Type. 1628 * 1629 * N.B.: Form isn't handled. 1630 */ 1631static int 1632receive_data(instr, outstr) 1633 FILE *instr, *outstr; 1634{ 1635 int c; 1636 int cnt; 1637 char buf[BUFSIZ]; 1638 struct sigaction sa, sa_saved; 1639 volatile int bare_lfs = 0; 1640 1641 transflag++; 1642 switch (type) { 1643 1644 case TYPE_I: 1645 case TYPE_L: 1646 memset(&sa, 0, sizeof(sa)); 1647 sigfillset(&sa.sa_mask); 1648 sa.sa_flags = SA_RESTART; 1649 sa.sa_handler = lostconn; 1650 (void) sigaction(SIGALRM, &sa, &sa_saved); 1651 do { 1652 (void) alarm ((unsigned) timeout); 1653 cnt = read(fileno(instr), buf, sizeof(buf)); 1654 (void) alarm (0); 1655 if (recvurg) 1656 goto got_oob; 1657 1658 if (cnt > 0) { 1659 if (write(fileno(outstr), buf, cnt) != cnt) 1660 goto file_err; 1661 byte_count += cnt; 1662 } 1663 } while (cnt > 0); 1664 (void) sigaction(SIGALRM, &sa_saved, NULL); 1665 if (cnt < 0) 1666 goto data_err; 1667 transflag = 0; 1668 return (0); 1669 1670 case TYPE_E: 1671 reply(553, "TYPE E not implemented."); 1672 transflag = 0; 1673 return (-1); 1674 1675 case TYPE_A: 1676 while ((c = getc(instr)) != EOF) { 1677 if (recvurg) 1678 goto got_oob; 1679 byte_count++; 1680 if (c == '\n') 1681 bare_lfs++; 1682 while (c == '\r') { 1683 if (ferror(outstr)) 1684 goto data_err; 1685 if ((c = getc(instr)) != '\n') { 1686 (void) putc ('\r', outstr); 1687 if (c == '\0' || c == EOF) 1688 goto contin2; 1689 } 1690 } 1691 (void) putc(c, outstr); 1692 contin2: ; 1693 } 1694 fflush(outstr); 1695 if (ferror(instr)) 1696 goto data_err; 1697 if (ferror(outstr)) 1698 goto file_err; 1699 transflag = 0; 1700 if (bare_lfs) { 1701 lreply(226, 1702 "WARNING! %d bare linefeeds received in ASCII mode", 1703 bare_lfs); 1704 printf(" File may not have transferred correctly.\r\n"); 1705 } 1706 return (0); 1707 default: 1708 reply(550, "Unimplemented TYPE %d in receive_data", type); 1709 transflag = 0; 1710 return (-1); 1711 } 1712 1713data_err: 1714 transflag = 0; 1715 perror_reply(426, "Data Connection"); 1716 return (-1); 1717 1718file_err: 1719 transflag = 0; 1720 perror_reply(452, "Error writing file"); 1721 return (-1); 1722 1723got_oob: 1724 myoob(); 1725 recvurg = 0; 1726 transflag = 0; 1727 return (-1); 1728} 1729 1730void 1731statfilecmd(filename) 1732 char *filename; 1733{ 1734 FILE *fin; 1735 int c; 1736 int atstart; 1737 char line[LINE_MAX]; 1738 1739 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1740 fin = ftpd_popen(line, "r"); 1741 lreply(211, "status of %s:", filename); 1742 atstart = 1; 1743 while ((c = getc(fin)) != EOF) { 1744 if (c == '\n') { 1745 if (ferror(stdout)){ 1746 perror_reply(421, "control connection"); 1747 (void) ftpd_pclose(fin); 1748 dologout(1); 1749 /* NOTREACHED */ 1750 } 1751 if (ferror(fin)) { 1752 perror_reply(551, filename); 1753 (void) ftpd_pclose(fin); 1754 return; 1755 } 1756 (void) putc('\r', stdout); 1757 } 1758 if (atstart && isdigit(c)) 1759 (void) putc(' ', stdout); 1760 (void) putc(c, stdout); 1761 atstart = (c == '\n'); 1762 } 1763 (void) ftpd_pclose(fin); 1764 reply(211, "End of Status"); 1765} 1766 1767void 1768statcmd() 1769{ 1770 union sockunion *su; 1771 u_char *a, *p; 1772 char hbuf[MAXHOSTNAMELEN]; 1773 int ispassive; 1774 1775 lreply(211, "%s FTP server status:", hostname, version); 1776 printf(" %s\r\n", version); 1777 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1778 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST); 1779 printf(" Connected to %s", remotehost); 1780 if (strcmp(remotehost, hbuf) != 0) 1781 printf(" (%s)", hbuf); 1782 printf("\r\n"); 1783 if (logged_in) { 1784 if (guest) 1785 printf(" Logged in anonymously\r\n"); 1786 else 1787 printf(" Logged in as %s\r\n", pw->pw_name); 1788 } else if (askpasswd) 1789 printf(" Waiting for password\r\n"); 1790 else 1791 printf(" Waiting for user name\r\n"); 1792 printf(" TYPE: %s", typenames[type]); 1793 if (type == TYPE_A || type == TYPE_E) 1794 printf(", FORM: %s", formnames[form]); 1795 if (type == TYPE_L) 1796#if NBBY == 8 1797 printf(" %d", NBBY); 1798#else 1799 printf(" %d", bytesize); /* need definition! */ 1800#endif 1801 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1802 strunames[stru], modenames[mode]); 1803 ispassive = 0; 1804 if (data != -1) 1805 printf(" Data connection open\r\n"); 1806 else if (pdata != -1) { 1807 printf(" in Passive mode\r\n"); 1808 su = (union sockunion *)&pasv_addr; 1809 ispassive++; 1810 goto printaddr; 1811 } else if (usedefault == 0) { 1812 su = (union sockunion *)&data_dest; 1813printaddr: 1814 /* PASV/PORT */ 1815 if (su->su_family == AF_INET) { 1816 if (ispassive) 1817 printf("211- PASV "); 1818 else 1819 printf("211- PORT "); 1820 a = (u_char *) &su->su_sin.sin_addr; 1821 p = (u_char *) &su->su_sin.sin_port; 1822 printf("(%u,%u,%u,%u,%u,%u)\r\n", 1823 a[0], a[1], a[2], a[3], 1824 p[0], p[1]); 1825 } 1826 1827 /* LPSV/LPRT */ 1828 { 1829 int alen, af, i; 1830 1831 alen = 0; 1832 switch (su->su_family) { 1833 case AF_INET: 1834 a = (u_char *) &su->su_sin.sin_addr; 1835 p = (u_char *) &su->su_sin.sin_port; 1836 alen = sizeof(su->su_sin.sin_addr); 1837 af = 4; 1838 break; 1839 case AF_INET6: 1840 a = (u_char *) &su->su_sin6.sin6_addr; 1841 p = (u_char *) &su->su_sin6.sin6_port; 1842 alen = sizeof(su->su_sin6.sin6_addr); 1843 af = 6; 1844 break; 1845 default: 1846 af = 0; 1847 break; 1848 } 1849 if (af) { 1850 if (ispassive) 1851 printf("211- LPSV "); 1852 else 1853 printf("211- LPRT "); 1854 printf("(%u,%u", af, alen); 1855 for (i = 0; i < alen; i++) 1856 printf(",%u", a[i]); 1857 printf(",%u,%u,%u)\r\n", 2, p[0], p[1]); 1858 } 1859 } 1860 1861 /* EPRT/EPSV */ 1862 { 1863 u_char af; 1864 1865 switch (su->su_family) { 1866 case AF_INET: 1867 af = 1; 1868 break; 1869 case AF_INET6: 1870 af = 2; 1871 break; 1872 default: 1873 af = 0; 1874 break; 1875 } 1876 if (af) { 1877 char hbuf[MAXHOSTNAMELEN], pbuf[10]; 1878 union sockunion tmp = *su; 1879 1880 if (tmp.su_family == AF_INET6) 1881 tmp.su_sin6.sin6_scope_id = 0; 1882 if (getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 1883 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1884 NI_NUMERICHOST | NI_NUMERICSERV) == 0) { 1885 if (ispassive) 1886 printf("211- EPSV "); 1887 else 1888 printf("211- EPRT "); 1889 printf("(|%u|%s|%s|)\r\n", 1890 af, hbuf, pbuf); 1891 } 1892 } 1893 } 1894 } else 1895 printf(" No data connection\r\n"); 1896 reply(211, "End of status"); 1897} 1898 1899void 1900fatal(s) 1901 char *s; 1902{ 1903 1904 reply(451, "Error in server: %s", s); 1905 reply(221, "Closing connection due to server error."); 1906 dologout(0); 1907 /* NOTREACHED */ 1908} 1909 1910void 1911reply(int n, const char *fmt, ...) 1912{ 1913 char *buf, *p, *next; 1914 va_list ap; 1915 1916 va_start(ap, fmt); 1917 if (vasprintf(&buf, fmt, ap) == -1 || buf == NULL) { 1918 printf("412 Local resource failure: malloc\r\n"); 1919 fflush(stdout); 1920 dologout(1); 1921 } 1922 next = buf; 1923 while ((p = strsep(&next, "\n\r"))) { 1924 printf("%d%s %s\r\n", n, (next != '\0') ? "-" : "", p); 1925 if (debug) 1926 syslog(LOG_DEBUG, "<--- %d%s %s", n, 1927 (next != '\0') ? "-" : "", p); 1928 } 1929 (void)fflush(stdout); 1930 free(buf); 1931 va_end(ap); 1932} 1933 1934void 1935lreply(int n, const char *fmt, ...) 1936{ 1937 va_list ap; 1938 1939 va_start(ap, fmt); 1940 (void)printf("%d- ", n); 1941 (void)vprintf(fmt, ap); 1942 va_end(ap); 1943 (void)printf("\r\n"); 1944 (void)fflush(stdout); 1945 if (debug) { 1946 va_start(ap, fmt); 1947 syslog(LOG_DEBUG, "<--- %d- ", n); 1948 vsyslog(LOG_DEBUG, fmt, ap); 1949 va_end(ap); 1950 } 1951} 1952 1953static void 1954ack(s) 1955 char *s; 1956{ 1957 1958 reply(250, "%s command successful.", s); 1959} 1960 1961void 1962nack(s) 1963 char *s; 1964{ 1965 1966 reply(502, "%s command not implemented.", s); 1967} 1968 1969/* ARGSUSED */ 1970void 1971yyerror(s) 1972 char *s; 1973{ 1974 char *cp; 1975 1976 if ((cp = strchr(cbuf,'\n'))) 1977 *cp = '\0'; 1978 reply(500, "'%s': command not understood.", cbuf); 1979} 1980 1981void 1982delete(name) 1983 char *name; 1984{ 1985 struct stat st; 1986 1987 LOGCMD("delete", name); 1988 if (stat(name, &st) < 0) { 1989 perror_reply(550, name); 1990 return; 1991 } 1992 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1993 if (rmdir(name) < 0) { 1994 perror_reply(550, name); 1995 return; 1996 } 1997 goto done; 1998 } 1999 if (unlink(name) < 0) { 2000 perror_reply(550, name); 2001 return; 2002 } 2003done: 2004 ack("DELE"); 2005} 2006 2007void 2008cwd(path) 2009 char *path; 2010{ 2011 FILE *message; 2012 2013 if (chdir(path) < 0) 2014 perror_reply(550, path); 2015 else { 2016 if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) { 2017 char *cp, line[LINE_MAX]; 2018 2019 while (fgets(line, sizeof(line), message) != NULL) { 2020 if ((cp = strchr(line, '\n')) != NULL) 2021 *cp = '\0'; 2022 lreply(250, "%s", line); 2023 } 2024 (void) fflush(stdout); 2025 (void) fclose(message); 2026 } 2027 ack("CWD"); 2028 } 2029} 2030 2031void 2032replydirname(name, message) 2033 const char *name, *message; 2034{ 2035 char *p, *ep; 2036 char npath[MAXPATHLEN * 2]; 2037 2038 p = npath; 2039 ep = &npath[sizeof(npath) - 1]; 2040 while (*name) { 2041 if (*name == '"') { 2042 if (ep - p < 2) 2043 break; 2044 *p++ = *name++; 2045 *p++ = '"'; 2046 } else { 2047 if (ep - p < 1) 2048 break; 2049 *p++ = *name++; 2050 } 2051 } 2052 *p = '\0'; 2053 reply(257, "\"%s\" %s", npath, message); 2054} 2055 2056void 2057makedir(name) 2058 char *name; 2059{ 2060 2061 LOGCMD("mkdir", name); 2062 if (mkdir(name, 0777) < 0) 2063 perror_reply(550, name); 2064 else 2065 replydirname(name, "directory created."); 2066} 2067 2068void 2069removedir(name) 2070 char *name; 2071{ 2072 2073 LOGCMD("rmdir", name); 2074 if (rmdir(name) < 0) 2075 perror_reply(550, name); 2076 else 2077 ack("RMD"); 2078} 2079 2080void 2081pwd() 2082{ 2083 char path[MAXPATHLEN]; 2084 2085 if (getcwd(path, sizeof(path)) == NULL) 2086 reply(550, "Can't get current directory: %s.", strerror(errno)); 2087 else 2088 replydirname(path, "is current directory."); 2089} 2090 2091char * 2092renamefrom(name) 2093 char *name; 2094{ 2095 struct stat st; 2096 2097 if (stat(name, &st) < 0) { 2098 perror_reply(550, name); 2099 return ((char *)0); 2100 } 2101 reply(350, "File exists, ready for destination name"); 2102 return (name); 2103} 2104 2105void 2106renamecmd(from, to) 2107 char *from, *to; 2108{ 2109 2110 LOGCMD2("rename", from, to); 2111 if (rename(from, to) < 0) 2112 perror_reply(550, "rename"); 2113 else 2114 ack("RNTO"); 2115} 2116 2117static void 2118dolog(sa) 2119 struct sockaddr *sa; 2120{ 2121 char hbuf[sizeof(remotehost)]; 2122 2123 getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0); 2124 (void) strlcpy(remotehost, hbuf, sizeof(remotehost)); 2125 2126#ifdef HASSETPROCTITLE 2127 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2128 setproctitle("%s", proctitle); 2129#endif /* HASSETPROCTITLE */ 2130 2131 if (logging) 2132 syslog(LOG_INFO, "connection from %s", remotehost); 2133} 2134 2135/* 2136 * Record logout in wtmp file and exit with supplied status. 2137 * NOTE: because this is called from signal handlers it cannot 2138 * use stdio (or call other functions that use stdio). 2139 */ 2140void 2141dologout(status) 2142 int status; 2143{ 2144 2145 transflag = 0; 2146 2147 if (logged_in) { 2148 sigprocmask(SIG_BLOCK, &allsigs, NULL); 2149 (void) seteuid((uid_t)0); 2150 ftpdlogwtmp(ttyline, "", ""); 2151 if (doutmp) 2152 logout(utmp.ut_line); 2153 } 2154 /* beware of flushing buffers after a SIGPIPE */ 2155 _exit(status); 2156} 2157 2158static void 2159sigurg(signo) 2160 int signo; 2161{ 2162 2163 recvurg = 1; 2164} 2165 2166static void 2167myoob() 2168{ 2169 char *cp; 2170 2171 /* only process if transfer occurring */ 2172 if (!transflag) 2173 return; 2174 cp = tmpline; 2175 if (getline(cp, 7, stdin) == NULL) { 2176 reply(221, "You could at least say goodbye."); 2177 dologout(0); 2178 } 2179 upper(cp); 2180 if (strcmp(cp, "ABOR\r\n") == 0) { 2181 tmpline[0] = '\0'; 2182 reply(426, "Transfer aborted. Data connection closed."); 2183 reply(226, "Abort successful"); 2184 } 2185 if (strcmp(cp, "STAT\r\n") == 0) { 2186 tmpline[0] = '\0'; 2187 if (file_size != (off_t) -1) 2188 reply(213, "Status: %qd of %qd bytes transferred", 2189 byte_count, file_size); 2190 else 2191 reply(213, "Status: %qd bytes transferred", byte_count); 2192 } 2193} 2194 2195/* 2196 * Note: a response of 425 is not mentioned as a possible response to 2197 * the PASV command in RFC959. However, it has been blessed as 2198 * a legitimate response by Jon Postel in a telephone conversation 2199 * with Rick Adams on 25 Jan 89. 2200 */ 2201void 2202passive() 2203{ 2204 socklen_t len; 2205 int on; 2206 u_char *p, *a; 2207 2208 if (pw == NULL) { 2209 reply(530, "Please login with USER and PASS"); 2210 return; 2211 } 2212 if (pdata >= 0) 2213 close(pdata); 2214 /* 2215 * XXX 2216 * At this point, it would be nice to have an algorithm that 2217 * inserted a growing delay in an attack scenario. Such a thing 2218 * would look like continual passive sockets being opened, but 2219 * nothing serious being done with them. They're not used to 2220 * move data; the entire attempt is just to use tcp FIN_WAIT 2221 * resources. 2222 */ 2223 pdata = socket(AF_INET, SOCK_STREAM, 0); 2224 if (pdata < 0) { 2225 perror_reply(425, "Can't open passive connection"); 2226 return; 2227 } 2228 2229 on = IP_PORTRANGE_HIGH; 2230 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2231 (char *)&on, sizeof(on)) < 0) 2232 goto pasv_error; 2233 2234 pasv_addr = ctrl_addr; 2235 pasv_addr.su_sin.sin_port = 0; 2236 if (bind(pdata, (struct sockaddr *)&pasv_addr, 2237 pasv_addr.su_len) < 0) 2238 goto pasv_error; 2239 2240 len = sizeof(pasv_addr); 2241 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2242 goto pasv_error; 2243 if (listen(pdata, 1) < 0) 2244 goto pasv_error; 2245 a = (u_char *) &pasv_addr.su_sin.sin_addr; 2246 p = (u_char *) &pasv_addr.su_sin.sin_port; 2247 2248 reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0], 2249 a[1], a[2], a[3], p[0], p[1]); 2250 return; 2251 2252pasv_error: 2253 (void) seteuid((uid_t)pw->pw_uid); 2254 (void) close(pdata); 2255 pdata = -1; 2256 perror_reply(425, "Can't open passive connection"); 2257 return; 2258} 2259 2260/* 2261 * convert protocol identifier to/from AF 2262 */ 2263int 2264lpsvproto2af(int proto) 2265{ 2266 2267 switch (proto) { 2268 case 4: return AF_INET; 2269#ifdef INET6 2270 case 6: return AF_INET6; 2271#endif 2272 default: return -1; 2273 } 2274} 2275 2276int 2277af2lpsvproto(int af) 2278{ 2279 2280 switch (af) { 2281 case AF_INET: return 4; 2282#ifdef INET6 2283 case AF_INET6: return 6; 2284#endif 2285 default: return -1; 2286 } 2287} 2288 2289int 2290epsvproto2af(int proto) 2291{ 2292 2293 switch (proto) { 2294 case 1: return AF_INET; 2295#ifdef INET6 2296 case 2: return AF_INET6; 2297#endif 2298 default: return -1; 2299 } 2300} 2301 2302int 2303af2epsvproto(int af) 2304{ 2305 2306 switch (af) { 2307 case AF_INET: return 1; 2308#ifdef INET6 2309 case AF_INET6: return 2; 2310#endif 2311 default: return -1; 2312 } 2313} 2314 2315/* 2316 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2317 * 229 Entering Extended Passive Mode (|||port|) 2318 */ 2319void 2320long_passive(char *cmd, int pf) 2321{ 2322 socklen_t len; 2323 int on; 2324 u_char *p, *a; 2325 2326 if (!logged_in) { 2327 syslog(LOG_NOTICE, "long passive but not logged in"); 2328 reply(503, "Login with USER first."); 2329 return; 2330 } 2331 2332 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2333 /* 2334 * XXX 2335 * only EPRT/EPSV ready clients will understand this 2336 */ 2337 if (strcmp(cmd, "EPSV") != 0) 2338 reply(501, "Network protocol mismatch"); /*XXX*/ 2339 else 2340 epsv_protounsupp("Network protocol mismatch"); 2341 2342 return; 2343 } 2344 2345 if (pdata >= 0) 2346 close(pdata); 2347 /* 2348 * XXX 2349 * At this point, it would be nice to have an algorithm that 2350 * inserted a growing delay in an attack scenario. Such a thing 2351 * would look like continual passive sockets being opened, but 2352 * nothing serious being done with them. They not used to move 2353 * data; the entire attempt is just to use tcp FIN_WAIT 2354 * resources. 2355 */ 2356 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2357 if (pdata < 0) { 2358 perror_reply(425, "Can't open passive connection"); 2359 return; 2360 } 2361 2362 switch (ctrl_addr.su_family) { 2363 case AF_INET: 2364 on = IP_PORTRANGE_HIGH; 2365 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2366 (char *)&on, sizeof(on)) < 0) 2367 goto pasv_error; 2368 break; 2369 case AF_INET6: 2370 on = IPV6_PORTRANGE_HIGH; 2371 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2372 (char *)&on, sizeof(on)) < 0) 2373 goto pasv_error; 2374 break; 2375 } 2376 2377 pasv_addr = ctrl_addr; 2378 pasv_addr.su_port = 0; 2379 (void) seteuid((uid_t) 0); 2380 if (bind(pdata, (struct sockaddr *) &pasv_addr, pasv_addr.su_len) < 0) { 2381 (void) seteuid((uid_t) pw->pw_uid); 2382 goto pasv_error; 2383 } 2384 (void) seteuid((uid_t) pw->pw_uid); 2385 len = pasv_addr.su_len; 2386 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2387 goto pasv_error; 2388 if (listen(pdata, 1) < 0) 2389 goto pasv_error; 2390 p = (u_char *) &pasv_addr.su_port; 2391 2392 if (strcmp(cmd, "LPSV") == 0) { 2393 switch (pasv_addr.su_family) { 2394 case AF_INET: 2395 a = (u_char *) &pasv_addr.su_sin.sin_addr; 2396 reply(228, 2397 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2398 4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]); 2399 return; 2400 case AF_INET6: 2401 a = (u_char *) &pasv_addr.su_sin6.sin6_addr; 2402 reply(228, 2403 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u," 2404 "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2405 6, 16, a[0], a[1], a[2], a[3], a[4], 2406 a[5], a[6], a[7], a[8], a[9], a[10], 2407 a[11], a[12], a[13], a[14], a[15], 2408 2, p[0], p[1]); 2409 return; 2410 } 2411 } else if (strcmp(cmd, "EPSV") == 0) { 2412 switch (pasv_addr.su_family) { 2413 case AF_INET: 2414 case AF_INET6: 2415 reply(229, "Entering Extended Passive Mode (|||%u|)", 2416 ntohs(pasv_addr.su_port)); 2417 return; 2418 } 2419 } else { 2420 /* more proper error code? */ 2421 } 2422 2423 pasv_error: 2424 (void) close(pdata); 2425 pdata = -1; 2426 perror_reply(425, "Can't open passive connection"); 2427 return; 2428} 2429 2430/* 2431 * EPRT |proto|addr|port| 2432 */ 2433int 2434extended_port(const char *arg) 2435{ 2436 char *tmp = NULL; 2437 char *result[3]; 2438 char *p, *q; 2439 char delim; 2440 struct addrinfo hints; 2441 struct addrinfo *res = NULL; 2442 int i; 2443 unsigned long proto; 2444 2445 if (epsvall) { 2446 reply(501, "EPRT disallowed after EPSV ALL"); 2447 return -1; 2448 } 2449 2450 usedefault = 0; 2451 if (pdata >= 0) { 2452 (void) close(pdata); 2453 pdata = -1; 2454 } 2455 2456 tmp = strdup(arg); 2457 if (!tmp) { 2458 fatal("not enough core."); 2459 /*NOTREACHED*/ 2460 } 2461 p = tmp; 2462 delim = p[0]; 2463 p++; 2464 memset(result, 0, sizeof(result)); 2465 for (i = 0; i < 3; i++) { 2466 q = strchr(p, delim); 2467 if (!q || *q != delim) 2468 goto parsefail; 2469 *q++ = '\0'; 2470 result[i] = p; 2471 p = q; 2472 } 2473 2474 /* some more sanity check */ 2475 p = NULL; 2476 (void)strtoul(result[2], &p, 10); 2477 if (!*result[2] || *p) 2478 goto protounsupp; 2479 p = NULL; 2480 proto = strtoul(result[0], &p, 10); 2481 if (!*result[0] || *p) 2482 goto protounsupp; 2483 2484 memset(&hints, 0, sizeof(hints)); 2485 hints.ai_family = epsvproto2af((int)proto); 2486 if (hints.ai_family < 0) 2487 goto protounsupp; 2488 hints.ai_socktype = SOCK_STREAM; 2489 hints.ai_flags = AI_NUMERICHOST; /*no DNS*/ 2490 if (getaddrinfo(result[1], result[2], &hints, &res)) 2491 goto parsefail; 2492 if (res->ai_next) 2493 goto parsefail; 2494 if (sizeof(data_dest) < res->ai_addrlen) 2495 goto parsefail; 2496 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2497 if (his_addr.su_family == AF_INET6 && 2498 data_dest.su_family == AF_INET6) { 2499 /* XXX more sanity checks! */ 2500 data_dest.su_sin6.sin6_scope_id = 2501 his_addr.su_sin6.sin6_scope_id; 2502 } 2503 if (pdata >= 0) { 2504 (void) close(pdata); 2505 pdata = -1; 2506 } 2507 reply(200, "EPRT command successful."); 2508 2509 if (tmp) 2510 free(tmp); 2511 if (res) 2512 freeaddrinfo(res); 2513 return 0; 2514 2515parsefail: 2516 reply(500, "Invalid argument, rejected."); 2517 usedefault = 1; 2518 if (tmp) 2519 free(tmp); 2520 if (res) 2521 freeaddrinfo(res); 2522 return -1; 2523 2524protounsupp: 2525 epsv_protounsupp("Protocol not supported"); 2526 usedefault = 1; 2527 if (tmp) 2528 free(tmp); 2529 if (res) 2530 freeaddrinfo(res); 2531 return -1; 2532} 2533 2534/* 2535 * 522 Protocol not supported (proto,...) 2536 * as we assume address family for control and data connections are the same, 2537 * we do not return the list of address families we support - instead, we 2538 * return the address family of the control connection. 2539 */ 2540void 2541epsv_protounsupp(const char *message) 2542{ 2543 int proto; 2544 2545 proto = af2epsvproto(ctrl_addr.su_family); 2546 if (proto < 0) 2547 reply(501, "%s", message); /*XXX*/ 2548 else 2549 reply(522, "%s, use (%d)", message, proto); 2550} 2551 2552/* 2553 * Generate unique name for file with basename "local". 2554 * The file named "local" is already known to exist. 2555 * Generates failure reply on error. 2556 */ 2557static int 2558guniquefd(local, nam) 2559 char *local; 2560 char **nam; 2561{ 2562 static char new[MAXPATHLEN]; 2563 struct stat st; 2564 int count, len, fd; 2565 char *cp; 2566 2567 cp = strrchr(local, '/'); 2568 if (cp) 2569 *cp = '\0'; 2570 if (stat(cp ? local : ".", &st) < 0) { 2571 perror_reply(553, cp ? local : "."); 2572 return (-1); 2573 } 2574 if (cp) 2575 *cp = '/'; 2576 len = strlcpy(new, local, sizeof(new)); 2577 if (len+2+1 >= sizeof(new)-1) 2578 return (-1); 2579 cp = new + len; 2580 *cp++ = '.'; 2581 for (count = 1; count < 100; count++) { 2582 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 2583 fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666); 2584 if (fd == -1) 2585 continue; 2586 if (nam) 2587 *nam = new; 2588 return (fd); 2589 } 2590 reply(452, "Unique file name cannot be created."); 2591 return (-1); 2592} 2593 2594/* 2595 * Format and send reply containing system error number. 2596 */ 2597void 2598perror_reply(code, string) 2599 int code; 2600 char *string; 2601{ 2602 2603 reply(code, "%s: %s.", string, strerror(errno)); 2604} 2605 2606static char *onefile[] = { 2607 "", 2608 0 2609}; 2610 2611void 2612send_file_list(whichf) 2613 char *whichf; 2614{ 2615 struct stat st; 2616 DIR *dirp = NULL; 2617 struct dirent *dir; 2618 FILE *dout = NULL; 2619 char **dirlist; 2620 char *dirname; 2621 int simple = 0; 2622 volatile int freeglob = 0; 2623 glob_t gl; 2624 2625 if (strpbrk(whichf, "~{[*?") != NULL) { 2626 memset(&gl, 0, sizeof(gl)); 2627 freeglob = 1; 2628 if (glob(whichf, 2629 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, 2630 0, &gl)) { 2631 reply(550, "not found"); 2632 goto out; 2633 } else if (gl.gl_pathc == 0) { 2634 errno = ENOENT; 2635 perror_reply(550, whichf); 2636 goto out; 2637 } 2638 dirlist = gl.gl_pathv; 2639 } else { 2640 onefile[0] = whichf; 2641 dirlist = onefile; 2642 simple = 1; 2643 } 2644 2645 while ((dirname = *dirlist++)) { 2646 if (stat(dirname, &st) < 0) { 2647 /* 2648 * If user typed "ls -l", etc, and the client 2649 * used NLST, do what the user meant. 2650 */ 2651 if (dirname[0] == '-' && *dirlist == NULL && 2652 transflag == 0) { 2653 retrieve("/bin/ls %s", dirname); 2654 goto out; 2655 } 2656 perror_reply(550, whichf); 2657 if (dout != NULL) { 2658 (void) fclose(dout); 2659 transflag = 0; 2660 data = -1; 2661 pdata = -1; 2662 } 2663 goto out; 2664 } 2665 2666 if (S_ISREG(st.st_mode)) { 2667 if (dout == NULL) { 2668 dout = dataconn("file list", (off_t)-1, "w"); 2669 if (dout == NULL) 2670 goto out; 2671 transflag++; 2672 } 2673 fprintf(dout, "%s%s\n", dirname, 2674 type == TYPE_A ? "\r" : ""); 2675 byte_count += strlen(dirname) + 1; 2676 continue; 2677 } else if (!S_ISDIR(st.st_mode)) 2678 continue; 2679 2680 if ((dirp = opendir(dirname)) == NULL) 2681 continue; 2682 2683 while ((dir = readdir(dirp)) != NULL) { 2684 char nbuf[MAXPATHLEN]; 2685 2686 if (recvurg) { 2687 myoob(); 2688 recvurg = 0; 2689 transflag = 0; 2690 goto out; 2691 } 2692 2693 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2694 continue; 2695 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2696 dir->d_namlen == 2) 2697 continue; 2698 2699 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 2700 dir->d_name); 2701 2702 /* 2703 * We have to do a stat to insure it's 2704 * not a directory or special file. 2705 */ 2706 if (simple || (stat(nbuf, &st) == 0 && 2707 S_ISREG(st.st_mode))) { 2708 if (dout == NULL) { 2709 dout = dataconn("file list", (off_t)-1, 2710 "w"); 2711 if (dout == NULL) 2712 goto out; 2713 transflag++; 2714 } 2715 if (nbuf[0] == '.' && nbuf[1] == '/') 2716 fprintf(dout, "%s%s\n", &nbuf[2], 2717 type == TYPE_A ? "\r" : ""); 2718 else 2719 fprintf(dout, "%s%s\n", nbuf, 2720 type == TYPE_A ? "\r" : ""); 2721 byte_count += strlen(nbuf) + 1; 2722 } 2723 } 2724 (void) closedir(dirp); 2725 } 2726 2727 if (dout == NULL) 2728 reply(550, "No files found."); 2729 else if (ferror(dout) != 0) 2730 perror_reply(550, "Data connection"); 2731 else 2732 reply(226, "Transfer complete."); 2733 2734 transflag = 0; 2735 if (dout != NULL) 2736 (void) fclose(dout); 2737 else { 2738 if (pdata >= 0) 2739 close(pdata); 2740 } 2741 data = -1; 2742 pdata = -1; 2743out: 2744 if (freeglob) { 2745 freeglob = 0; 2746 globfree(&gl); 2747 } 2748} 2749 2750static void 2751reapchild(signo) 2752 int signo; 2753{ 2754 int save_errno = errno; 2755 int rval; 2756 2757 do { 2758 rval = waitpid(-1, NULL, WNOHANG); 2759 } while (rval > 0 || (rval == -1 && errno == EINTR)); 2760 errno = save_errno; 2761} 2762 2763void 2764logxfer(name, size, start) 2765 char *name; 2766 off_t size; 2767 time_t start; 2768{ 2769 char buf[400 + MAXHOSTNAMELEN*4 + MAXPATHLEN*4]; 2770 char dir[MAXPATHLEN], path[MAXPATHLEN], rpath[MAXPATHLEN]; 2771 char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; 2772 char *vpw; 2773 time_t now; 2774 int len; 2775 2776 if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) { 2777 time(&now); 2778 2779 vpw = malloc(strlen(guest ? guestpw : pw->pw_name) * 4 + 1); 2780 if (vpw == NULL) 2781 return; 2782 2783 snprintf(path, sizeof(path), "%s/%s", dir, name); 2784 if (realpath(path, rpath) == NULL) 2785 strlcpy(rpath, path, sizeof(rpath)); 2786 strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH); 2787 2788 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2789 strvis(vpw, guest? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2790 2791 len = snprintf(buf, sizeof(buf), 2792 "%.24s %d %s %qd %s %c %s %c %c %s ftp %d %s %s\n", 2793 ctime(&now), now - start + (now == start), 2794 vremotehost, (long long) size, vpath, 2795 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2796 'o', ((guest) ? 'a' : 'r'), 2797 vpw, 0 /* none yet */, 2798 ((guest) ? "*" : pw->pw_name), dhostname); 2799 if (len >= sizeof(buf)) { 2800 len = sizeof(buf); 2801 buf[sizeof(buf) - 1] = '\n'; 2802 } 2803 write(statfd, buf, len); 2804 free(vpw); 2805 } 2806} 2807 2808#if defined(TCPWRAPPERS) 2809static int 2810check_host(sa) 2811 struct sockaddr *sa; 2812{ 2813 struct sockaddr_in *sin; 2814 struct hostent *hp; 2815 char *addr; 2816 2817 if (sa->sa_family != AF_INET) 2818 return 1; /*XXX*/ 2819 2820 sin = (struct sockaddr_in *)sa; 2821 hp = gethostbyaddr((char *)&sin->sin_addr, 2822 sizeof(struct in_addr), AF_INET); 2823 addr = inet_ntoa(sin->sin_addr); 2824 if (hp) { 2825 if (!hosts_ctl("ftpd", hp->h_name, addr, STRING_UNKNOWN)) { 2826 syslog(LOG_NOTICE, "tcpwrappers rejected: %s [%s]", 2827 hp->h_name, addr); 2828 return (0); 2829 } 2830 } else { 2831 if (!hosts_ctl("ftpd", STRING_UNKNOWN, addr, STRING_UNKNOWN)) { 2832 syslog(LOG_NOTICE, "tcpwrappers rejected: [%s]", addr); 2833 return (0); 2834 } 2835 } 2836 return (1); 2837} 2838#endif /* TCPWRAPPERS */ 2839 2840/* 2841 * Allocate space and return a copy of the specified dir. 2842 * If 'dir' begins with a tilde (~), expand it. 2843 */ 2844char * 2845copy_dir(dir, pw) 2846 char *dir; 2847 struct passwd *pw; 2848{ 2849 char *cp; 2850 char *newdir; 2851 char *user = NULL; 2852 size_t dirsiz; 2853 2854 /* Nothing to expand */ 2855 if (dir[0] != '~') 2856 return (strdup(dir)); 2857 2858 /* "dir" is of form ~user/some/dir, lookup user. */ 2859 if (dir[1] != '/' && dir[1] != '\0') { 2860 if ((cp = strchr(dir + 1, '/')) == NULL) 2861 cp = dir + strlen(dir); 2862 if ((user = malloc(cp - dir)) == NULL) 2863 return (NULL); 2864 strlcpy(user, dir + 1, cp - dir); 2865 2866 /* Only do lookup if it is a different user. */ 2867 if (strcmp(user, pw->pw_name) != 0) { 2868 if ((pw = getpwnam(user)) == NULL) { 2869 /* No such user, interpret literally */ 2870 free(user); 2871 return(strdup(dir)); 2872 } 2873 } 2874 } 2875 2876 /* 2877 * If there is no directory separator (/) then it is just pw_dir. 2878 * Otherwise, replace ~foo with pw_dir. 2879 */ 2880 if ((cp = strchr(dir + 1, '/')) == NULL) { 2881 newdir = strdup(pw->pw_dir); 2882 } else { 2883 dirsiz = strlen(cp) + strlen(pw->pw_dir) + 1; 2884 if ((newdir = malloc(dirsiz)) == NULL) { 2885 free(user); 2886 return (NULL); 2887 } 2888 strlcpy(newdir, pw->pw_dir, dirsiz); 2889 strlcat(newdir, cp, dirsiz); 2890 } 2891 2892 if (user) 2893 free(user); 2894 return(newdir); 2895} 2896