1/* 2 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#if 0 35#ifndef lint 36static char copyright[] = 37"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39#endif /* not lint */ 40#endif 41 42#ifndef lint 43#if 0 44static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 45#endif 46#endif /* not lint */ 47 48#include <sys/cdefs.h> 49__FBSDID("$FreeBSD: src/libexec/ftpd/ftpd.c,v 1.212 2007/04/18 22:43:39 yar Exp $"); 50 51/* 52 * FTP server. 53 */ 54#include <sys/param.h> 55#include <sys/ioctl.h> 56//#include <sys/mman.h> 57#include <sys/socket.h> 58#include <sys/stat.h> 59#include <sys/time.h> 60#include <sys/wait.h> 61 62#include <netinet/in.h> 63#include <netinet/in_systm.h> 64#include <netinet/ip.h> 65#include <netinet/tcp.h> 66 67#define FTP_NAMES 68#include <arpa/ftp.h> 69#include <arpa/inet.h> 70#include <arpa/telnet.h> 71 72#include <ctype.h> 73#include <dirent.h> 74#include <err.h> 75#include <errno.h> 76#include <fcntl.h> 77#include <glob.h> 78#include <limits.h> 79#include <netdb.h> 80#include <pwd.h> 81#include <grp.h> 82#ifdef HAVE_LIBOPIE 83#include <opie.h> 84#endif 85#include <signal.h> 86#include <stdint.h> 87#include <stdio.h> 88#include <stdlib.h> 89#include <string.h> 90#include <syslog.h> 91#include <time.h> 92#include <unistd.h> 93#include <libutil.h> 94#ifdef LOGIN_CAP 95#include <login_cap.h> 96#endif 97 98#ifdef USE_PAM 99#include <security/pam_appl.h> 100#endif 101 102#ifdef __HAIKU__ 103#include <shadow.h> 104#endif 105 106#include "pathnames.h" 107#include "extern.h" 108 109#include <stdarg.h> 110 111static char version[] = "Version 6.00LS"; 112#undef main 113 114extern off_t restart_point; 115extern char cbuf[]; 116 117union sockunion ctrl_addr; 118union sockunion data_source; 119union sockunion data_dest; 120union sockunion his_addr; 121union sockunion pasv_addr; 122 123int daemon_mode; 124int data; 125int dataport; 126int hostinfo = 1; /* print host-specific info in messages */ 127int logged_in; 128struct passwd *pw; 129char *homedir; 130int ftpdebug; 131int timeout = 900; /* timeout after 15 minutes of inactivity */ 132int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 133int logging; 134int restricted_data_ports = 1; 135int paranoid = 1; /* be extra careful about security */ 136int anon_only = 0; /* Only anonymous ftp allowed */ 137int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 138int guest; 139int dochroot; 140char *chrootdir; 141int dowtmp = 1; 142int stats; 143int statfd = -1; 144int type; 145int form; 146int stru; /* avoid C keyword */ 147int mode; 148int usedefault = 1; /* for data transfers */ 149int pdata = -1; /* for passive mode */ 150int readonly = 0; /* Server is in readonly mode. */ 151int noepsv = 0; /* EPSV command is disabled. */ 152int noretr = 0; /* RETR command is disabled. */ 153int noguestretr = 0; /* RETR command is disabled for anon users. */ 154int noguestmkd = 0; /* MKD command is disabled for anon users. */ 155int noguestmod = 1; /* anon users may not modify existing files. */ 156 157off_t file_size; 158off_t byte_count; 159#if !defined(CMASK) || CMASK == 0 160#undef CMASK 161#define CMASK 027 162#endif 163int defumask = CMASK; /* default umask value */ 164char tmpline[7]; 165char *hostname; 166int epsvall = 0; 167 168#ifdef VIRTUAL_HOSTING 169char *ftpuser; 170 171static struct ftphost { 172 struct ftphost *next; 173 struct addrinfo *hostinfo; 174 char *hostname; 175 char *anonuser; 176 char *statfile; 177 char *welcome; 178 char *loginmsg; 179} *thishost, *firsthost; 180 181#endif 182char remotehost[NI_MAXHOST]; 183char *ident = NULL; 184 185static char ttyline[20]; 186char *tty = ttyline; /* for klogin */ 187 188#ifdef USE_PAM 189static int auth_pam(struct passwd**, const char*); 190pam_handle_t *pamh = NULL; 191#endif 192 193#ifdef HAVE_LIBOPIE 194static struct opie opiedata; 195static char opieprompt[OPIE_CHALLENGE_MAX+1]; 196#endif 197static int pwok; 198 199char *pid_file = NULL; /* means default location to pidfile(3) */ 200 201/* 202 * Limit number of pathnames that glob can return. 203 * A limit of 0 indicates the number of pathnames is unlimited. 204 */ 205#define MAXGLOBARGS 16384 206# 207 208/* 209 * Timeout intervals for retrying connections 210 * to hosts that don't accept PORT cmds. This 211 * is a kludge, but given the problems with TCP... 212 */ 213#define SWAITMAX 90 /* wait at most 90 seconds */ 214#define SWAITINT 5 /* interval between retries */ 215 216int swaitmax = SWAITMAX; 217int swaitint = SWAITINT; 218 219#ifdef SETPROCTITLE 220#ifdef OLD_SETPROCTITLE 221char **Argv = NULL; /* pointer to argument vector */ 222char *LastArgv = NULL; /* end of argv */ 223#endif /* OLD_SETPROCTITLE */ 224char proctitle[LINE_MAX]; /* initial part of title */ 225#endif /* SETPROCTITLE */ 226 227#define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 228#define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 229#define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 230 231static volatile sig_atomic_t recvurg; 232static int transflag; /* NB: for debugging only */ 233 234#define STARTXFER flagxfer(1) 235#define ENDXFER flagxfer(0) 236 237#define START_UNSAFE maskurg(1) 238#define END_UNSAFE maskurg(0) 239 240/* It's OK to put an `else' clause after this macro. */ 241#define CHECKOOB(action) \ 242 if (recvurg) { \ 243 recvurg = 0; \ 244 if (myoob()) { \ 245 ENDXFER; \ 246 action; \ 247 } \ 248 } 249 250#ifdef VIRTUAL_HOSTING 251static void inithosts(int); 252static void selecthost(union sockunion *); 253#endif 254static void ack(char *); 255static void sigurg(int); 256static void maskurg(int); 257static void flagxfer(int); 258static int myoob(void); 259static int checkuser(char *, char *, int, char **); 260static FILE *dataconn(char *, off_t, char *); 261static void dolog(struct sockaddr *); 262static void end_login(void); 263static FILE *getdatasock(char *); 264static int guniquefd(char *, char **); 265static void lostconn(int); 266static void sigquit(int); 267static int receive_data(FILE *, FILE *); 268static int send_data(FILE *, FILE *, size_t, off_t, int); 269static struct passwd * 270 sgetpwnam(char *); 271static char *sgetsave(char *); 272static void reapchild(int); 273static void appendf(char **, char *, ...) __printflike(2, 3); 274static void logcmd(char *, char *, char *, off_t); 275static void logxfer(char *, off_t, time_t); 276static char *doublequote(char *); 277static int *socksetup(int, char *, const char *); 278 279int 280main(int argc, char *argv[], char **envp) 281{ 282 socklen_t addrlen; 283 int ch, on = 1, tos; 284 char *cp, line[LINE_MAX]; 285 FILE *fd; 286 char *bindname = NULL; 287 const char *bindport = "ftp"; 288 int family = AF_UNSPEC; 289 struct sigaction sa; 290 291 tzset(); /* in case no timezone database in ~ftp */ 292 sigemptyset(&sa.sa_mask); 293 sa.sa_flags = SA_RESTART; 294 295#ifdef OLD_SETPROCTITLE 296 /* 297 * Save start and extent of argv for setproctitle. 298 */ 299 Argv = argv; 300 while (*envp) 301 envp++; 302 LastArgv = envp[-1] + strlen(envp[-1]); 303#endif /* OLD_SETPROCTITLE */ 304 305 /* 306 * Prevent diagnostic messages from appearing on stderr. 307 * We run as a daemon or from inetd; in both cases, there's 308 * more reason in logging to syslog. 309 */ 310 (void) freopen(_PATH_DEVNULL, "w", stderr); 311 opterr = 0; 312 313 /* 314 * LOG_NDELAY sets up the logging connection immediately, 315 * necessary for anonymous ftp's that chroot and can't do it later. 316 */ 317 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 318 319 while ((ch = getopt(argc, argv, 320 "468a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 321 switch (ch) { 322 case '4': 323 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 324 break; 325 326 case '6': 327 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 328 break; 329 330 case '8': 331 assumeutf8 = 1; 332 break; 333 334 case 'a': 335 bindname = optarg; 336 break; 337 338 case 'A': 339 anon_only = 1; 340 break; 341 342 case 'd': 343 ftpdebug++; 344 break; 345 346 case 'D': 347 daemon_mode++; 348 break; 349 350 case 'E': 351 noepsv = 1; 352 break; 353 354 case 'h': 355 hostinfo = 0; 356 break; 357 358 case 'l': 359 logging++; /* > 1 == extra logging */ 360 break; 361 362 case 'm': 363 noguestmod = 0; 364 break; 365 366 case 'M': 367 noguestmkd = 1; 368 break; 369 370 case 'o': 371 noretr = 1; 372 break; 373 374 case 'O': 375 noguestretr = 1; 376 break; 377 378 case 'p': 379 pid_file = optarg; 380 break; 381 382 case 'P': 383 bindport = optarg; 384 break; 385 386 case 'r': 387 readonly = 1; 388 break; 389 390 case 'R': 391 paranoid = 0; 392 break; 393 394 case 'S': 395 stats++; 396 break; 397 398 case 't': 399 timeout = atoi(optarg); 400 if (maxtimeout < timeout) 401 maxtimeout = timeout; 402 break; 403 404 case 'T': 405 maxtimeout = atoi(optarg); 406 if (timeout > maxtimeout) 407 timeout = maxtimeout; 408 break; 409 410 case 'u': 411 { 412 long val = 0; 413 414 val = strtol(optarg, &optarg, 8); 415 if (*optarg != '\0' || val < 0) 416 syslog(LOG_WARNING, "bad value for -u"); 417 else 418 defumask = val; 419 break; 420 } 421 case 'U': 422 restricted_data_ports = 0; 423 break; 424 425 case 'v': 426 ftpdebug++; 427 break; 428 429 case 'W': 430 dowtmp = 0; 431 break; 432 433 default: 434 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 435 break; 436 } 437 } 438 439 if (daemon_mode) { 440 int *ctl_sock, fd, maxfd = -1, nfds, i; 441 fd_set defreadfds, readfds; 442 pid_t pid; 443 struct pidfh *pfh; 444 445 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) { 446 if (errno == EEXIST) { 447 syslog(LOG_ERR, "%s already running, pid %d", 448 getprogname(), (int)pid); 449 exit(1); 450 } 451 syslog(LOG_WARNING, "pidfile_open: %m"); 452 } 453 454 /* 455 * Detach from parent. 456 */ 457 if (daemon(1, 1) < 0) { 458 syslog(LOG_ERR, "failed to become a daemon"); 459 exit(1); 460 } 461 462 if (pfh != NULL && pidfile_write(pfh) == -1) 463 syslog(LOG_WARNING, "pidfile_write: %m"); 464 465 sa.sa_handler = reapchild; 466 (void)sigaction(SIGCHLD, &sa, NULL); 467 468#ifdef VIRTUAL_HOSTING 469 inithosts(family); 470#endif 471 472 /* 473 * Open a socket, bind it to the FTP port, and start 474 * listening. 475 */ 476 ctl_sock = socksetup(family, bindname, bindport); 477 if (ctl_sock == NULL) 478 exit(1); 479 480 FD_ZERO(&defreadfds); 481 for (i = 1; i <= *ctl_sock; i++) { 482 FD_SET(ctl_sock[i], &defreadfds); 483 if (listen(ctl_sock[i], 32) < 0) { 484 syslog(LOG_ERR, "control listen: %m"); 485 exit(1); 486 } 487 if (maxfd < ctl_sock[i]) 488 maxfd = ctl_sock[i]; 489 } 490 491 /* 492 * Loop forever accepting connection requests and forking off 493 * children to handle them. 494 */ 495 while (1) { 496 FD_COPY(&defreadfds, &readfds); 497 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 498 if (nfds <= 0) { 499 if (nfds < 0 && errno != EINTR) 500 syslog(LOG_WARNING, "select: %m"); 501 continue; 502 } 503 504 pid = -1; 505 for (i = 1; i <= *ctl_sock; i++) 506 if (FD_ISSET(ctl_sock[i], &readfds)) { 507 addrlen = sizeof(his_addr); 508 fd = accept(ctl_sock[i], 509 (struct sockaddr *)&his_addr, 510 &addrlen); 511 if (fd == -1) { 512 syslog(LOG_WARNING, 513 "accept: %m"); 514 continue; 515 } 516 switch (pid = fork()) { 517 case 0: 518 /* child */ 519 (void) dup2(fd, 0); 520 (void) dup2(fd, 1); 521 (void) close(fd); 522 for (i = 1; i <= *ctl_sock; i++) 523 close(ctl_sock[i]); 524 if (pfh != NULL) 525 pidfile_close(pfh); 526 goto gotchild; 527 case -1: 528 syslog(LOG_WARNING, "fork: %m"); 529 /* FALLTHROUGH */ 530 default: 531 close(fd); 532 } 533 } 534 } 535 } else { 536 addrlen = sizeof(his_addr); 537 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 538 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 539 exit(1); 540 } 541 542#ifdef VIRTUAL_HOSTING 543 if (his_addr.su_family == AF_INET6 && 544 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 545 family = AF_INET; 546 else 547 family = his_addr.su_family; 548 inithosts(family); 549#endif 550 } 551 552gotchild: 553 sa.sa_handler = SIG_DFL; 554 (void)sigaction(SIGCHLD, &sa, NULL); 555 556 sa.sa_handler = sigurg; 557 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 558 (void)sigaction(SIGURG, &sa, NULL); 559 560 sigfillset(&sa.sa_mask); /* block all signals in handler */ 561 sa.sa_flags = SA_RESTART; 562 sa.sa_handler = sigquit; 563 (void)sigaction(SIGHUP, &sa, NULL); 564 (void)sigaction(SIGINT, &sa, NULL); 565 (void)sigaction(SIGQUIT, &sa, NULL); 566 (void)sigaction(SIGTERM, &sa, NULL); 567 568 sa.sa_handler = lostconn; 569 (void)sigaction(SIGPIPE, &sa, NULL); 570 571 addrlen = sizeof(ctrl_addr); 572 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 573 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 574 exit(1); 575 } 576 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 577#ifdef VIRTUAL_HOSTING 578 /* select our identity from virtual host table */ 579 selecthost(&ctrl_addr); 580#endif 581#ifdef IP_TOS 582 if (ctrl_addr.su_family == AF_INET) 583 { 584 tos = IPTOS_LOWDELAY; 585 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 586 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 587 } 588#endif 589 /* 590 * Disable Nagle on the control channel so that we don't have to wait 591 * for peer's ACK before issuing our next reply. 592 */ 593 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 594 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 595 596 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 597 598 /* set this here so klogin can use it... */ 599 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", (int)getpid()); 600 601 /* Try to handle urgent data inline */ 602#ifdef SO_OOBINLINE 603 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 604 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 605#endif 606 607#ifdef F_SETOWN 608 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 609 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 610#endif 611 dolog((struct sockaddr *)&his_addr); 612 /* 613 * Set up default state 614 */ 615 data = -1; 616 type = TYPE_A; 617 form = FORM_N; 618 stru = STRU_F; 619 mode = MODE_S; 620 tmpline[0] = '\0'; 621 622 /* If logins are disabled, print out the message. */ 623 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 624 while (fgets(line, sizeof(line), fd) != NULL) { 625 if ((cp = strchr(line, '\n')) != NULL) 626 *cp = '\0'; 627 lreply(530, "%s", line); 628 } 629 (void) fflush(stdout); 630 (void) fclose(fd); 631 reply(530, "System not available."); 632 exit(0); 633 } 634#ifdef VIRTUAL_HOSTING 635 fd = fopen(thishost->welcome, "r"); 636#else 637 fd = fopen(_PATH_FTPWELCOME, "r"); 638#endif 639 if (fd != NULL) { 640 while (fgets(line, sizeof(line), fd) != NULL) { 641 if ((cp = strchr(line, '\n')) != NULL) 642 *cp = '\0'; 643 lreply(220, "%s", line); 644 } 645 (void) fflush(stdout); 646 (void) fclose(fd); 647 /* reply(220,) must follow */ 648 } 649#ifndef VIRTUAL_HOSTING 650 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 651 fatalerror("Ran out of memory."); 652 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 653 hostname[0] = '\0'; 654 hostname[MAXHOSTNAMELEN - 1] = '\0'; 655#endif 656 if (hostinfo) 657 reply(220, "%s FTP server (%s) ready.", hostname, version); 658 else 659 reply(220, "FTP server ready."); 660 for (;;) 661 (void) yyparse(); 662 /* NOTREACHED */ 663} 664 665static void 666lostconn(int signo) 667{ 668 669 if (ftpdebug) 670 syslog(LOG_DEBUG, "lost connection"); 671 dologout(1); 672} 673 674static void 675sigquit(int signo) 676{ 677 678 syslog(LOG_ERR, "got signal %d", signo); 679 dologout(1); 680} 681 682#ifdef VIRTUAL_HOSTING 683/* 684 * read in virtual host tables (if they exist) 685 */ 686 687static void 688inithosts(int family) 689{ 690 int insert; 691 size_t len; 692 FILE *fp; 693 char *cp, *mp, *line; 694 char *hostname; 695 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 696 struct ftphost *hrp, *lhrp; 697 struct addrinfo hints, *res, *ai; 698 699 /* 700 * Fill in the default host information 701 */ 702 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 703 fatalerror("Ran out of memory."); 704 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 705 hostname[0] = '\0'; 706 hostname[MAXHOSTNAMELEN - 1] = '\0'; 707 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 708 fatalerror("Ran out of memory."); 709 hrp->hostname = hostname; 710 hrp->hostinfo = NULL; 711 712 memset(&hints, 0, sizeof(hints)); 713 hints.ai_flags = AI_PASSIVE; 714 hints.ai_family = family; 715 hints.ai_socktype = SOCK_STREAM; 716 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 717 hrp->hostinfo = res; 718 hrp->statfile = _PATH_FTPDSTATFILE; 719 hrp->welcome = _PATH_FTPWELCOME; 720 hrp->loginmsg = _PATH_FTPLOGINMESG; 721 hrp->anonuser = "ftp"; 722 hrp->next = NULL; 723 thishost = firsthost = lhrp = hrp; 724 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 725 int addrsize, gothost; 726 void *addr; 727 struct hostent *hp; 728 729 while ((line = fgetln(fp, &len)) != NULL) { 730 int i, hp_error; 731 732 /* skip comments */ 733 if (line[0] == '#') 734 continue; 735 if (line[len - 1] == '\n') { 736 line[len - 1] = '\0'; 737 mp = NULL; 738 } else { 739 if ((mp = malloc(len + 1)) == NULL) 740 fatalerror("Ran out of memory."); 741 memcpy(mp, line, len); 742 mp[len] = '\0'; 743 line = mp; 744 } 745 cp = strtok(line, " \t"); 746 /* skip empty lines */ 747 if (cp == NULL) 748 goto nextline; 749 vhost = cp; 750 751 /* set defaults */ 752 anonuser = "ftp"; 753 statfile = _PATH_FTPDSTATFILE; 754 welcome = _PATH_FTPWELCOME; 755 loginmsg = _PATH_FTPLOGINMESG; 756 757 /* 758 * Preparse the line so we can use its info 759 * for all the addresses associated with 760 * the virtual host name. 761 * Field 0, the virtual host name, is special: 762 * it's already parsed off and will be strdup'ed 763 * later, after we know its canonical form. 764 */ 765 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 766 if (*cp != '-' && (cp = strdup(cp))) 767 switch (i) { 768 case 1: /* anon user permissions */ 769 anonuser = cp; 770 break; 771 case 2: /* statistics file */ 772 statfile = cp; 773 break; 774 case 3: /* welcome message */ 775 welcome = cp; 776 break; 777 case 4: /* login message */ 778 loginmsg = cp; 779 break; 780 default: /* programming error */ 781 abort(); 782 /* NOTREACHED */ 783 } 784 785 hints.ai_flags = AI_PASSIVE; 786 hints.ai_family = family; 787 hints.ai_socktype = SOCK_STREAM; 788 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 789 goto nextline; 790 for (ai = res; ai != NULL && ai->ai_addr != NULL; 791 ai = ai->ai_next) { 792 793 gothost = 0; 794 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 795 struct addrinfo *hi; 796 797 for (hi = hrp->hostinfo; hi != NULL; 798 hi = hi->ai_next) 799 if (hi->ai_addrlen == ai->ai_addrlen && 800 memcmp(hi->ai_addr, 801 ai->ai_addr, 802 ai->ai_addr->sa_len) == 0) { 803 gothost++; 804 break; 805 } 806 if (gothost) 807 break; 808 } 809 if (hrp == NULL) { 810 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 811 goto nextline; 812 hrp->hostname = NULL; 813 insert = 1; 814 } else { 815 if (hrp->hostinfo && hrp->hostinfo != res) 816 freeaddrinfo(hrp->hostinfo); 817 insert = 0; /* host already in the chain */ 818 } 819 hrp->hostinfo = res; 820 821 /* 822 * determine hostname to use. 823 * force defined name if there is a valid alias 824 * otherwise fallback to primary hostname 825 */ 826 /* XXX: getaddrinfo() can't do alias check */ 827 switch(hrp->hostinfo->ai_family) { 828 case AF_INET: 829 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 830 addrsize = sizeof(struct in_addr); 831 break; 832 case AF_INET6: 833 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 834 addrsize = sizeof(struct in6_addr); 835 break; 836 default: 837 /* should not reach here */ 838 freeaddrinfo(hrp->hostinfo); 839 if (insert) 840 free(hrp); /*not in chain, can free*/ 841 else 842 hrp->hostinfo = NULL; /*mark as blank*/ 843 goto nextline; 844 /* NOTREACHED */ 845 } 846 if ((hp = getipnodebyaddr(addr, addrsize, 847 hrp->hostinfo->ai_family, 848 &hp_error)) != NULL) { 849 if (strcmp(vhost, hp->h_name) != 0) { 850 if (hp->h_aliases == NULL) 851 vhost = hp->h_name; 852 else { 853 i = 0; 854 while (hp->h_aliases[i] && 855 strcmp(vhost, hp->h_aliases[i]) != 0) 856 ++i; 857 if (hp->h_aliases[i] == NULL) 858 vhost = hp->h_name; 859 } 860 } 861 } 862 if (hrp->hostname && 863 strcmp(hrp->hostname, vhost) != 0) { 864 free(hrp->hostname); 865 hrp->hostname = NULL; 866 } 867 if (hrp->hostname == NULL && 868 (hrp->hostname = strdup(vhost)) == NULL) { 869 freeaddrinfo(hrp->hostinfo); 870 hrp->hostinfo = NULL; /* mark as blank */ 871 if (hp) 872 freehostent(hp); 873 goto nextline; 874 } 875 hrp->anonuser = anonuser; 876 hrp->statfile = statfile; 877 hrp->welcome = welcome; 878 hrp->loginmsg = loginmsg; 879 if (insert) { 880 hrp->next = NULL; 881 lhrp->next = hrp; 882 lhrp = hrp; 883 } 884 if (hp) 885 freehostent(hp); 886 } 887nextline: 888 if (mp) 889 free(mp); 890 } 891 (void) fclose(fp); 892 } 893} 894 895static void 896selecthost(union sockunion *su) 897{ 898 struct ftphost *hrp; 899 u_int16_t port; 900#ifdef INET6 901 struct in6_addr *mapped_in6 = NULL; 902#endif 903 struct addrinfo *hi; 904 905#ifdef INET6 906 /* 907 * XXX IPv4 mapped IPv6 addr consideraton, 908 * specified in rfc2373. 909 */ 910 if (su->su_family == AF_INET6 && 911 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 912 mapped_in6 = &su->su_sin6.sin6_addr; 913#endif 914 915 hrp = thishost = firsthost; /* default */ 916 port = su->su_port; 917 su->su_port = 0; 918 while (hrp != NULL) { 919 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 920 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 921 thishost = hrp; 922 goto found; 923 } 924#ifdef INET6 925 /* XXX IPv4 mapped IPv6 addr consideraton */ 926 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 927 (memcmp(&mapped_in6->s6_addr[12], 928 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 929 sizeof(struct in_addr)) == 0)) { 930 thishost = hrp; 931 goto found; 932 } 933#endif 934 } 935 hrp = hrp->next; 936 } 937found: 938 su->su_port = port; 939 /* setup static variables as appropriate */ 940 hostname = thishost->hostname; 941 ftpuser = thishost->anonuser; 942} 943#endif 944 945/* 946 * Helper function for sgetpwnam(). 947 */ 948static char * 949sgetsave(char *s) 950{ 951 char *new = malloc(strlen(s) + 1); 952 953 if (new == NULL) { 954 reply(421, "Ran out of memory."); 955 dologout(1); 956 /* NOTREACHED */ 957 } 958 (void) strcpy(new, s); 959 return (new); 960} 961 962/* 963 * Save the result of a getpwnam. Used for USER command, since 964 * the data returned must not be clobbered by any other command 965 * (e.g., globbing). 966 * NB: The data returned by sgetpwnam() will remain valid until 967 * the next call to this function. Its difference from getpwnam() 968 * is that sgetpwnam() is known to be called from ftpd code only. 969 */ 970static struct passwd * 971sgetpwnam(char *name) 972{ 973 static struct passwd save; 974 struct passwd *p; 975#ifdef __HAIKU__ 976 struct spwd *sp = NULL; 977#endif 978 979 if ((p = getpwnam(name)) == NULL) 980 return (p); 981#ifdef __HAIKU__ 982 if (strcmp(p->pw_passwd, "x") == 0) { 983 if ((sp = getspnam(name)) == NULL) 984 return (p); 985 } 986#endif 987 if (save.pw_name) { 988 free(save.pw_name); 989 free(save.pw_passwd); 990 free(save.pw_gecos); 991 free(save.pw_dir); 992 free(save.pw_shell); 993 } 994 save = *p; 995 save.pw_name = sgetsave(p->pw_name); 996#ifdef __HAIKU__ 997 if (sp) 998 save.pw_passwd = sgetsave(sp->sp_pwdp); 999 else 1000#endif 1001 save.pw_passwd = sgetsave(p->pw_passwd); 1002 save.pw_gecos = sgetsave(p->pw_gecos); 1003 save.pw_dir = sgetsave(p->pw_dir); 1004 save.pw_shell = sgetsave(p->pw_shell); 1005 return (&save); 1006} 1007 1008static int login_attempts; /* number of failed login attempts */ 1009static int askpasswd; /* had user command, ask for passwd */ 1010static char curname[MAXLOGNAME]; /* current USER name */ 1011 1012/* 1013 * USER command. 1014 * Sets global passwd pointer pw if named account exists and is acceptable; 1015 * sets askpasswd if a PASS command is expected. If logged in previously, 1016 * need to reset state. If name is "ftp" or "anonymous", the name is not in 1017 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 1018 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 1019 * requesting login privileges. Disallow anyone who does not have a standard 1020 * shell as returned by getusershell(). Disallow anyone mentioned in the file 1021 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 1022 */ 1023void 1024user(char *name) 1025{ 1026 char *cp, *shell; 1027 1028 if (logged_in) { 1029 if (guest) { 1030 reply(530, "Can't change user from guest login."); 1031 return; 1032 } else if (dochroot) { 1033 reply(530, "Can't change user from chroot user."); 1034 return; 1035 } 1036 end_login(); 1037 } 1038 1039 guest = 0; 1040#ifdef VIRTUAL_HOSTING 1041 pw = sgetpwnam(thishost->anonuser); 1042#else 1043 pw = sgetpwnam("ftp"); 1044#endif 1045 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1046 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 1047 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 1048 reply(530, "User %s access denied.", name); 1049 else if (pw != NULL) { 1050 guest = 1; 1051 askpasswd = 1; 1052 reply(331, 1053 "Guest login ok, send your email address as password."); 1054 } else 1055 reply(530, "User %s unknown.", name); 1056 if (!askpasswd && logging) 1057 syslog(LOG_NOTICE, 1058 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1059 return; 1060 } 1061 if (anon_only != 0) { 1062 reply(530, "Sorry, only anonymous ftp allowed."); 1063 return; 1064 } 1065 1066 if ((pw = sgetpwnam(name))) { 1067 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1068 shell = _PATH_BSHELL; 1069 setusershell(); 1070 while ((cp = getusershell()) != NULL) 1071 if (strcmp(cp, shell) == 0) 1072 break; 1073 endusershell(); 1074 1075 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1076 reply(530, "User %s access denied.", name); 1077 if (logging) 1078 syslog(LOG_NOTICE, 1079 "FTP LOGIN REFUSED FROM %s, %s", 1080 remotehost, name); 1081 pw = NULL; 1082 return; 1083 } 1084 } 1085 if (logging) 1086 strncpy(curname, name, sizeof(curname)-1); 1087 1088 pwok = 0; 1089#ifdef USE_PAM 1090 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1091#endif 1092#ifdef HAVE_LIBOPIE 1093 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1094 pwok = (pw != NULL) && 1095 opieaccessfile(remotehost) && 1096 opiealways(pw->pw_dir); 1097 reply(331, "Response to %s %s for %s.", 1098 opieprompt, pwok ? "requested" : "required", name); 1099 } else 1100#endif 1101 { 1102 pwok = 1; 1103 reply(331, "Password required for %s.", name); 1104 } 1105 askpasswd = 1; 1106 /* 1107 * Delay before reading passwd after first failed 1108 * attempt to slow down passwd-guessing programs. 1109 */ 1110 if (login_attempts) 1111 sleep(login_attempts); 1112} 1113 1114/* 1115 * Check if a user is in the file "fname", 1116 * return a pointer to a malloc'd string with the rest 1117 * of the matching line in "residue" if not NULL. 1118 */ 1119static int 1120checkuser(char *fname, char *name, int pwset, char **residue) 1121{ 1122 FILE *fd; 1123 int found = 0; 1124 size_t len; 1125 char *line, *mp, *p; 1126 1127 if ((fd = fopen(fname, "r")) != NULL) { 1128 while (!found && (line = fgetln(fd, &len)) != NULL) { 1129 /* skip comments */ 1130 if (line[0] == '#') 1131 continue; 1132 if (line[len - 1] == '\n') { 1133 line[len - 1] = '\0'; 1134 mp = NULL; 1135 } else { 1136 if ((mp = malloc(len + 1)) == NULL) 1137 fatalerror("Ran out of memory."); 1138 memcpy(mp, line, len); 1139 mp[len] = '\0'; 1140 line = mp; 1141 } 1142 /* avoid possible leading and trailing whitespace */ 1143 p = strtok(line, " \t"); 1144 /* skip empty lines */ 1145 if (p == NULL) 1146 goto nextline; 1147 /* 1148 * if first chr is '@', check group membership 1149 */ 1150 if (p[0] == '@') { 1151 int i = 0; 1152 struct group *grp; 1153 1154 if (p[1] == '\0') /* single @ matches anyone */ 1155 found = 1; 1156 else { 1157 if ((grp = getgrnam(p+1)) == NULL) 1158 goto nextline; 1159 /* 1160 * Check user's default group 1161 */ 1162 if (pwset && grp->gr_gid == pw->pw_gid) 1163 found = 1; 1164 /* 1165 * Check supplementary groups 1166 */ 1167 while (!found && grp->gr_mem[i]) 1168 found = strcmp(name, 1169 grp->gr_mem[i++]) 1170 == 0; 1171 } 1172 } 1173 /* 1174 * Otherwise, just check for username match 1175 */ 1176 else 1177 found = strcmp(p, name) == 0; 1178 /* 1179 * Save the rest of line to "residue" if matched 1180 */ 1181 if (found && residue) { 1182 if ((p = strtok(NULL, "")) != NULL) 1183 p += strspn(p, " \t"); 1184 if (p && *p) { 1185 if ((*residue = strdup(p)) == NULL) 1186 fatalerror("Ran out of memory."); 1187 } else 1188 *residue = NULL; 1189 } 1190nextline: 1191 if (mp) 1192 free(mp); 1193 } 1194 (void) fclose(fd); 1195 } 1196 return (found); 1197} 1198 1199/* 1200 * Terminate login as previous user, if any, resetting state; 1201 * used when USER command is given or login fails. 1202 */ 1203static void 1204end_login(void) 1205{ 1206#ifdef USE_PAM 1207 int e; 1208#endif 1209 1210 (void) seteuid(0); 1211 if (logged_in && dowtmp) 1212 ftpd_logwtmp(ttyline, "", NULL); 1213 pw = NULL; 1214#ifdef LOGIN_CAP 1215 setusercontext(NULL, getpwuid(0), 0, 1216 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1217 LOGIN_SETMAC); 1218#endif 1219#ifdef USE_PAM 1220 if (pamh) { 1221 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1222 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1223 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1224 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1225 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1226 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1227 pamh = NULL; 1228 } 1229#endif 1230 logged_in = 0; 1231 guest = 0; 1232 dochroot = 0; 1233} 1234 1235#ifdef USE_PAM 1236 1237/* 1238 * the following code is stolen from imap-uw PAM authentication module and 1239 * login.c 1240 */ 1241#define COPY_STRING(s) (s ? strdup(s) : NULL) 1242 1243struct cred_t { 1244 const char *uname; /* user name */ 1245 const char *pass; /* password */ 1246}; 1247typedef struct cred_t cred_t; 1248 1249static int 1250auth_conv(int num_msg, const struct pam_message **msg, 1251 struct pam_response **resp, void *appdata) 1252{ 1253 int i; 1254 cred_t *cred = (cred_t *) appdata; 1255 struct pam_response *reply; 1256 1257 reply = calloc(num_msg, sizeof *reply); 1258 if (reply == NULL) 1259 return PAM_BUF_ERR; 1260 1261 for (i = 0; i < num_msg; i++) { 1262 switch (msg[i]->msg_style) { 1263 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1264 reply[i].resp_retcode = PAM_SUCCESS; 1265 reply[i].resp = COPY_STRING(cred->uname); 1266 /* PAM frees resp. */ 1267 break; 1268 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1269 reply[i].resp_retcode = PAM_SUCCESS; 1270 reply[i].resp = COPY_STRING(cred->pass); 1271 /* PAM frees resp. */ 1272 break; 1273 case PAM_TEXT_INFO: 1274 case PAM_ERROR_MSG: 1275 reply[i].resp_retcode = PAM_SUCCESS; 1276 reply[i].resp = NULL; 1277 break; 1278 default: /* unknown message style */ 1279 free(reply); 1280 return PAM_CONV_ERR; 1281 } 1282 } 1283 1284 *resp = reply; 1285 return PAM_SUCCESS; 1286} 1287 1288/* 1289 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1290 * authenticated, or 1 if not authenticated. If some sort of PAM system 1291 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1292 * function returns -1. This can be used as an indication that we should 1293 * fall back to a different authentication mechanism. 1294 */ 1295static int 1296auth_pam(struct passwd **ppw, const char *pass) 1297{ 1298 const char *tmpl_user; 1299 const void *item; 1300 int rval; 1301 int e; 1302 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1303 struct pam_conv conv = { &auth_conv, &auth_cred }; 1304 1305 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1306 if (e != PAM_SUCCESS) { 1307 /* 1308 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1309 * if context creation has failed in the first place. 1310 */ 1311 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1312 return -1; 1313 } 1314 1315 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1316 if (e != PAM_SUCCESS) { 1317 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1318 pam_strerror(pamh, e)); 1319 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1320 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1321 } 1322 pamh = NULL; 1323 return -1; 1324 } 1325 1326 e = pam_authenticate(pamh, 0); 1327 switch (e) { 1328 case PAM_SUCCESS: 1329 /* 1330 * With PAM we support the concept of a "template" 1331 * user. The user enters a login name which is 1332 * authenticated by PAM, usually via a remote service 1333 * such as RADIUS or TACACS+. If authentication 1334 * succeeds, a different but related "template" name 1335 * is used for setting the credentials, shell, and 1336 * home directory. The name the user enters need only 1337 * exist on the remote authentication server, but the 1338 * template name must be present in the local password 1339 * database. 1340 * 1341 * This is supported by two various mechanisms in the 1342 * individual modules. However, from the application's 1343 * point of view, the template user is always passed 1344 * back as a changed value of the PAM_USER item. 1345 */ 1346 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1347 PAM_SUCCESS) { 1348 tmpl_user = (const char *) item; 1349 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1350 *ppw = getpwnam(tmpl_user); 1351 } else 1352 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1353 pam_strerror(pamh, e)); 1354 rval = 0; 1355 break; 1356 1357 case PAM_AUTH_ERR: 1358 case PAM_USER_UNKNOWN: 1359 case PAM_MAXTRIES: 1360 rval = 1; 1361 break; 1362 1363 default: 1364 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1365 rval = -1; 1366 break; 1367 } 1368 1369 if (rval == 0) { 1370 e = pam_acct_mgmt(pamh, 0); 1371 if (e != PAM_SUCCESS) { 1372 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1373 pam_strerror(pamh, e)); 1374 rval = 1; 1375 } 1376 } 1377 1378 if (rval != 0) { 1379 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1380 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1381 } 1382 pamh = NULL; 1383 } 1384 return rval; 1385} 1386 1387#endif /* USE_PAM */ 1388 1389void 1390pass(char *passwd) 1391{ 1392 int rval; 1393 FILE *fd; 1394#ifdef LOGIN_CAP 1395 login_cap_t *lc = NULL; 1396#endif 1397#ifdef USE_PAM 1398 int e; 1399#endif 1400 char *residue = NULL; 1401 char *xpasswd; 1402 1403 if (logged_in || askpasswd == 0) { 1404 reply(503, "Login with USER first."); 1405 return; 1406 } 1407 askpasswd = 0; 1408 if (!guest) { /* "ftp" is only account allowed no password */ 1409 if (pw == NULL) { 1410 rval = 1; /* failure below */ 1411 goto skip; 1412 } 1413#ifdef USE_PAM 1414 rval = auth_pam(&pw, passwd); 1415 if (rval >= 0) { 1416 opieunlock(); 1417 goto skip; 1418 } 1419#endif 1420#ifdef HAVE_LIBOPIE 1421 if (opieverify(&opiedata, passwd) == 0) 1422 xpasswd = pw->pw_passwd; 1423 else 1424#endif 1425 if (pwok) { 1426 xpasswd = crypt(passwd, pw->pw_passwd); 1427 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1428 xpasswd = ":"; 1429 } else { 1430 rval = 1; 1431 goto skip; 1432 } 1433 rval = strcmp(pw->pw_passwd, xpasswd); 1434#if (!defined(__BEOS__) && !defined(__HAIKU__)) 1435 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1436 rval = 1; /* failure */ 1437#endif 1438skip: 1439 /* 1440 * If rval == 1, the user failed the authentication check 1441 * above. If rval == 0, either PAM or local authentication 1442 * succeeded. 1443 */ 1444 if (rval) { 1445 reply(530, "Login incorrect."); 1446 if (logging) { 1447 syslog(LOG_NOTICE, 1448 "FTP LOGIN FAILED FROM %s", 1449 remotehost); 1450 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1451 "FTP LOGIN FAILED FROM %s, %s", 1452 remotehost, curname); 1453 } 1454 pw = NULL; 1455 if (login_attempts++ >= 5) { 1456 syslog(LOG_NOTICE, 1457 "repeated login failures from %s", 1458 remotehost); 1459 exit(0); 1460 } 1461 return; 1462 } 1463 } 1464 login_attempts = 0; /* this time successful */ 1465 if (setegid(pw->pw_gid) < 0) { 1466 reply(550, "Can't set gid."); 1467 return; 1468 } 1469 /* May be overridden by login.conf */ 1470 (void) umask(defumask); 1471#ifdef LOGIN_CAP 1472 if ((lc = login_getpwclass(pw)) != NULL) { 1473 char remote_ip[NI_MAXHOST]; 1474 1475 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1476 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1477 NI_NUMERICHOST)) 1478 *remote_ip = 0; 1479 remote_ip[sizeof(remote_ip) - 1] = 0; 1480 if (!auth_hostok(lc, remotehost, remote_ip)) { 1481 syslog(LOG_INFO|LOG_AUTH, 1482 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1483 pw->pw_name); 1484 reply(530, "Permission denied."); 1485 pw = NULL; 1486 return; 1487 } 1488 if (!auth_timeok(lc, time(NULL))) { 1489 reply(530, "Login not available right now."); 1490 pw = NULL; 1491 return; 1492 } 1493 } 1494 setusercontext(lc, pw, 0, 1495 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1496 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1497#elif !(defined(__BEOS__) || defined(__HAIKU__)) 1498 setlogin(pw->pw_name); 1499 (void) initgroups(pw->pw_name, pw->pw_gid); 1500#endif 1501 1502#ifdef USE_PAM 1503 if (pamh) { 1504 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1505 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1506 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1507 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1508 } 1509 } 1510#endif 1511 1512 /* open wtmp before chroot */ 1513 if (dowtmp) 1514 ftpd_logwtmp(ttyline, pw->pw_name, 1515 (struct sockaddr *)&his_addr); 1516 logged_in = 1; 1517 1518 if (guest && stats && statfd < 0) 1519#ifdef VIRTUAL_HOSTING 1520 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1521#else 1522 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1523#endif 1524 if (statfd < 0) 1525 stats = 0; 1526 1527 dochroot = 1528 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1529#ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1530 || login_getcapbool(lc, "ftp-chroot", 0) 1531#endif 1532 ; 1533 chrootdir = NULL; 1534#if (!defined(__BEOS__) && !defined(__HAIKU__)) 1535 /* 1536 * For a chrooted local user, 1537 * a) see whether ftpchroot(5) specifies a chroot directory, 1538 * b) extract the directory pathname from the line, 1539 * c) expand it to the absolute pathname if necessary. 1540 */ 1541 if (dochroot && residue && 1542 (chrootdir = strtok(residue, " \t")) != NULL) { 1543 if (chrootdir[0] != '/') 1544 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1545 else 1546 chrootdir = strdup(chrootdir); /* make it permanent */ 1547 if (chrootdir == NULL) 1548 fatalerror("Ran out of memory."); 1549 } 1550#endif 1551 if (guest || dochroot) { 1552#if (!defined(__BEOS__) && !defined(__HAIKU__)) 1553 /* 1554 * If no chroot directory set yet, use the login directory. 1555 * Copy it so it can be modified while pw->pw_dir stays intact. 1556 */ 1557 if (chrootdir == NULL && 1558 (chrootdir = strdup(pw->pw_dir)) == NULL) 1559 fatalerror("Ran out of memory."); 1560 /* 1561 * Check for the "/chroot/./home" syntax, 1562 * separate the chroot and home directory pathnames. 1563 */ 1564 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1565 *(homedir++) = '\0'; /* wipe '/' */ 1566 homedir++; /* skip '.' */ 1567 } else { 1568 /* 1569 * We MUST do a chdir() after the chroot. Otherwise 1570 * the old current directory will be accessible as "." 1571 * outside the new root! 1572 */ 1573 homedir = "/"; 1574 } 1575 /* 1576 * Finally, do chroot() 1577 */ 1578 if (chroot(chrootdir) < 0) { 1579 reply(550, "Can't change root."); 1580 goto bad; 1581 } 1582#else 1583 homedir = "/"; 1584#endif 1585 } else /* real user w/o chroot */ 1586 homedir = pw->pw_dir; 1587 /* 1588 * Set euid *before* doing chdir() so 1589 * a) the user won't be carried to a directory that he couldn't reach 1590 * on his own due to no permission to upper path components, 1591 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1592 * (uid 0 has no root power over NFS if not mapped explicitly.) 1593 */ 1594 if (seteuid(pw->pw_uid) < 0) { 1595 reply(550, "Can't set uid."); 1596 goto bad; 1597 } 1598 if (chdir(homedir) < 0) { 1599 if (guest || dochroot) { 1600 reply(550, "Can't change to base directory."); 1601 goto bad; 1602 } else { 1603 if (chdir("/") < 0) { 1604 reply(550, "Root is inaccessible."); 1605 goto bad; 1606 } 1607 lreply(230, "No directory! Logging in with home=/."); 1608 } 1609 } 1610 1611 /* 1612 * Display a login message, if it exists. 1613 * N.B. reply(230,) must follow the message. 1614 */ 1615#ifdef VIRTUAL_HOSTING 1616 fd = fopen(thishost->loginmsg, "r"); 1617#else 1618 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1619#endif 1620 if (fd != NULL) { 1621 char *cp, line[LINE_MAX]; 1622 1623 while (fgets(line, sizeof(line), fd) != NULL) { 1624 if ((cp = strchr(line, '\n')) != NULL) 1625 *cp = '\0'; 1626 lreply(230, "%s", line); 1627 } 1628 (void) fflush(stdout); 1629 (void) fclose(fd); 1630 } 1631 if (guest) { 1632 if (ident != NULL) 1633 free(ident); 1634 ident = strdup(passwd); 1635 if (ident == NULL) 1636 fatalerror("Ran out of memory."); 1637 1638 reply(230, "Guest login ok, access restrictions apply."); 1639#ifdef SETPROCTITLE 1640#ifdef VIRTUAL_HOSTING 1641 if (thishost != firsthost) 1642 snprintf(proctitle, sizeof(proctitle), 1643 "%s: anonymous(%s)/%s", remotehost, hostname, 1644 passwd); 1645 else 1646#endif 1647 snprintf(proctitle, sizeof(proctitle), 1648 "%s: anonymous/%s", remotehost, passwd); 1649 setproctitle("%s", proctitle); 1650#endif /* SETPROCTITLE */ 1651 if (logging) 1652 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1653 remotehost, passwd); 1654 } else { 1655 if (dochroot) 1656 reply(230, "User %s logged in, " 1657 "access restrictions apply.", pw->pw_name); 1658 else 1659 reply(230, "User %s logged in.", pw->pw_name); 1660 1661#ifdef SETPROCTITLE 1662 snprintf(proctitle, sizeof(proctitle), 1663 "%s: user/%s", remotehost, pw->pw_name); 1664 setproctitle("%s", proctitle); 1665#endif /* SETPROCTITLE */ 1666 if (logging) 1667 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1668 remotehost, pw->pw_name); 1669 } 1670 if (logging && (guest || dochroot)) 1671 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1672#ifdef LOGIN_CAP 1673 login_close(lc); 1674#endif 1675 if (residue) 1676 free(residue); 1677 return; 1678bad: 1679 /* Forget all about it... */ 1680#ifdef LOGIN_CAP 1681 login_close(lc); 1682#endif 1683 if (residue) 1684 free(residue); 1685 end_login(); 1686} 1687 1688void 1689retrieve(char *cmd, char *name) 1690{ 1691 FILE *fin, *dout; 1692 struct stat st; 1693 int (*closefunc)(FILE *); 1694 time_t start; 1695 1696 if (cmd == 0) { 1697 fin = fopen(name, "r"), closefunc = fclose; 1698 st.st_size = 0; 1699 } else { 1700 char line[BUFSIZ]; 1701 1702 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1703 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1704 st.st_size = -1; 1705 st.st_blksize = BUFSIZ; 1706 } 1707 if (fin == NULL) { 1708 if (errno != 0) { 1709 perror_reply(550, name); 1710 if (cmd == 0) { 1711 LOGCMD("get", name); 1712 } 1713 } 1714 return; 1715 } 1716 byte_count = -1; 1717 if (cmd == 0) { 1718 if (fstat(fileno(fin), &st) < 0) { 1719 perror_reply(550, name); 1720 goto done; 1721 } 1722 if (!S_ISREG(st.st_mode)) { 1723 /* 1724 * Never sending a raw directory is a workaround 1725 * for buggy clients that will attempt to RETR 1726 * a directory before listing it, e.g., Mozilla. 1727 * Preventing a guest from getting irregular files 1728 * is a simple security measure. 1729 */ 1730 if (S_ISDIR(st.st_mode) || guest) { 1731 reply(550, "%s: not a plain file.", name); 1732 goto done; 1733 } 1734 st.st_size = -1; 1735 /* st.st_blksize is set for all descriptor types */ 1736 } 1737 } 1738 if (restart_point) { 1739 if (type == TYPE_A) { 1740 off_t i, n; 1741 int c; 1742 1743 n = restart_point; 1744 i = 0; 1745 while (i++ < n) { 1746 if ((c=getc(fin)) == EOF) { 1747 perror_reply(550, name); 1748 goto done; 1749 } 1750 if (c == '\n') 1751 i++; 1752 } 1753 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1754 perror_reply(550, name); 1755 goto done; 1756 } 1757 } 1758 dout = dataconn(name, st.st_size, "w"); 1759 if (dout == NULL) 1760 goto done; 1761 time(&start); 1762 send_data(fin, dout, st.st_blksize, st.st_size, 1763 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1764 if (cmd == 0 && guest && stats && byte_count > 0) 1765 logxfer(name, byte_count, start); 1766 (void) fclose(dout); 1767 data = -1; 1768 pdata = -1; 1769done: 1770 if (cmd == 0) 1771 LOGBYTES("get", name, byte_count); 1772 (*closefunc)(fin); 1773} 1774 1775void 1776store(char *name, char *mode, int unique) 1777{ 1778 int fd; 1779 FILE *fout, *din; 1780 int (*closefunc)(FILE *); 1781 1782 if (*mode == 'a') { /* APPE */ 1783 if (unique) { 1784 /* Programming error */ 1785 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1786 unique = 0; 1787 } 1788 if (guest && noguestmod) { 1789 reply(550, "Appending to existing file denied."); 1790 goto err; 1791 } 1792 restart_point = 0; /* not affected by preceding REST */ 1793 } 1794 if (unique) /* STOU overrides REST */ 1795 restart_point = 0; 1796 if (guest && noguestmod) { 1797 if (restart_point) { /* guest STOR w/REST */ 1798 reply(550, "Modifying existing file denied."); 1799 goto err; 1800 } else /* treat guest STOR as STOU */ 1801 unique = 1; 1802 } 1803 1804 if (restart_point) 1805 mode = "r+"; /* so ASCII manual seek can work */ 1806 if (unique) { 1807 if ((fd = guniquefd(name, &name)) < 0) 1808 goto err; 1809 fout = fdopen(fd, mode); 1810 } else 1811 fout = fopen(name, mode); 1812 closefunc = fclose; 1813 if (fout == NULL) { 1814 perror_reply(553, name); 1815 goto err; 1816 } 1817 byte_count = -1; 1818 if (restart_point) { 1819 if (type == TYPE_A) { 1820 off_t i, n; 1821 int c; 1822 1823 n = restart_point; 1824 i = 0; 1825 while (i++ < n) { 1826 if ((c=getc(fout)) == EOF) { 1827 perror_reply(550, name); 1828 goto done; 1829 } 1830 if (c == '\n') 1831 i++; 1832 } 1833 /* 1834 * We must do this seek to "current" position 1835 * because we are changing from reading to 1836 * writing. 1837 */ 1838 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1839 perror_reply(550, name); 1840 goto done; 1841 } 1842 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1843 perror_reply(550, name); 1844 goto done; 1845 } 1846 } 1847 din = dataconn(name, -1, "r"); 1848 if (din == NULL) 1849 goto done; 1850 if (receive_data(din, fout) == 0) { 1851 if (unique) 1852 reply(226, "Transfer complete (unique file name:%s).", 1853 name); 1854 else 1855 reply(226, "Transfer complete."); 1856 } 1857 (void) fclose(din); 1858 data = -1; 1859 pdata = -1; 1860done: 1861 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1862 (*closefunc)(fout); 1863 return; 1864err: 1865 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1866 return; 1867} 1868 1869static FILE * 1870getdatasock(char *mode) 1871{ 1872 int on = 1, s, t, tries; 1873 1874 if (data >= 0) 1875 return (fdopen(data, mode)); 1876 1877 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1878 if (s < 0) 1879 goto bad; 1880 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1881 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1882 /* anchor socket to avoid multi-homing problems */ 1883 data_source = ctrl_addr; 1884 data_source.su_port = htons(dataport); 1885 (void) seteuid(0); 1886 for (tries = 1; ; tries++) { 1887 /* 1888 * We should loop here since it's possible that 1889 * another ftpd instance has passed this point and is 1890 * trying to open a data connection in active mode now. 1891 * Until the other connection is opened, we'll be getting 1892 * EADDRINUSE because no SOCK_STREAM sockets in the system 1893 * can share both local and remote addresses, localIP:20 1894 * and *:* in this case. 1895 */ 1896 if (bind(s, (struct sockaddr *)&data_source, 1897 data_source.su_len) >= 0) 1898 break; 1899 if (errno != EADDRINUSE || tries > 10) 1900 goto bad; 1901 sleep(tries); 1902 } 1903 (void) seteuid(pw->pw_uid); 1904#ifdef IP_TOS 1905 if (data_source.su_family == AF_INET) 1906 { 1907 on = IPTOS_THROUGHPUT; 1908 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1909 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1910 } 1911#endif 1912#ifdef TCP_NOPUSH 1913 /* 1914 * Turn off push flag to keep sender TCP from sending short packets 1915 * at the boundaries of each write(). 1916 */ 1917 on = 1; 1918 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1919 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1920#endif 1921 return (fdopen(s, mode)); 1922bad: 1923 /* Return the real value of errno (close may change it) */ 1924 t = errno; 1925 (void) seteuid(pw->pw_uid); 1926 (void) close(s); 1927 errno = t; 1928 return (NULL); 1929} 1930 1931static FILE * 1932dataconn(char *name, off_t size, char *mode) 1933{ 1934 char sizebuf[32]; 1935 FILE *file; 1936 int retry = 0, tos, conerrno; 1937 1938 file_size = size; 1939 byte_count = 0; 1940 if (size != -1) 1941 (void) snprintf(sizebuf, sizeof(sizebuf), 1942 " (%lld bytes)", (intmax_t)size); 1943 else 1944 *sizebuf = '\0'; 1945 if (pdata >= 0) { 1946 union sockunion from; 1947 socklen_t fromlen = ctrl_addr.su_len; 1948 int flags, s; 1949 struct timeval timeout; 1950 fd_set set; 1951 1952 FD_ZERO(&set); 1953 FD_SET(pdata, &set); 1954 1955 timeout.tv_usec = 0; 1956 timeout.tv_sec = 120; 1957 1958 /* 1959 * Granted a socket is in the blocking I/O mode, 1960 * accept() will block after a successful select() 1961 * if the selected connection dies in between. 1962 * Therefore set the non-blocking I/O flag here. 1963 */ 1964 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1965 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1966 goto pdata_err; 1967 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1968 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1969 goto pdata_err; 1970 (void) close(pdata); 1971 pdata = s; 1972 /* 1973 * Unset the inherited non-blocking I/O flag 1974 * on the child socket so stdio can work on it. 1975 */ 1976 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1977 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1978 goto pdata_err; 1979#ifdef IP_TOS 1980 if (from.su_family == AF_INET) 1981 { 1982 tos = IPTOS_THROUGHPUT; 1983 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1984 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1985 } 1986#endif 1987 reply(150, "Opening %s mode data connection for '%s'%s.", 1988 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1989 return (fdopen(pdata, mode)); 1990pdata_err: 1991 reply(425, "Can't open data connection."); 1992 (void) close(pdata); 1993 pdata = -1; 1994 return (NULL); 1995 } 1996 if (data >= 0) { 1997 reply(125, "Using existing data connection for '%s'%s.", 1998 name, sizebuf); 1999 usedefault = 1; 2000 return (fdopen(data, mode)); 2001 } 2002 if (usedefault) 2003 data_dest = his_addr; 2004 usedefault = 1; 2005 do { 2006 file = getdatasock(mode); 2007 if (file == NULL) { 2008 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 2009 2010 if (getnameinfo((struct sockaddr *)&data_source, 2011 data_source.su_len, 2012 hostbuf, sizeof(hostbuf) - 1, 2013 portbuf, sizeof(portbuf) - 1, 2014 NI_NUMERICHOST|NI_NUMERICSERV)) 2015 *hostbuf = *portbuf = 0; 2016 hostbuf[sizeof(hostbuf) - 1] = 0; 2017 portbuf[sizeof(portbuf) - 1] = 0; 2018 reply(425, "Can't create data socket (%s,%s): %s.", 2019 hostbuf, portbuf, strerror(errno)); 2020 return (NULL); 2021 } 2022 data = fileno(file); 2023 conerrno = 0; 2024 if (connect(data, (struct sockaddr *)&data_dest, 2025 data_dest.su_len) == 0) 2026 break; 2027 conerrno = errno; 2028 (void) fclose(file); 2029 data = -1; 2030 if (conerrno == EADDRINUSE) { 2031 sleep(swaitint); 2032 retry += swaitint; 2033 } else { 2034 break; 2035 } 2036 } while (retry <= swaitmax); 2037 if (conerrno != 0) { 2038 reply(425, "Can't build data connection: %s.", 2039 strerror(conerrno)); 2040 return (NULL); 2041 } 2042 reply(150, "Opening %s mode data connection for '%s'%s.", 2043 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2044 return (file); 2045} 2046 2047/* 2048 * A helper macro to avoid code duplication 2049 * in send_data() and receive_data(). 2050 * 2051 * XXX We have to block SIGURG during putc() because BSD stdio 2052 * is unable to restart interrupted write operations and hence 2053 * the entire buffer contents will be lost as soon as a write() 2054 * call indicates EINTR to stdio. 2055 */ 2056#define FTPD_PUTC(ch, file, label) \ 2057 do { \ 2058 int ret; \ 2059 \ 2060 do { \ 2061 START_UNSAFE; \ 2062 ret = putc((ch), (file)); \ 2063 END_UNSAFE; \ 2064 CHECKOOB(return (-1)) \ 2065 else if (ferror(file)) \ 2066 goto label; \ 2067 clearerr(file); \ 2068 } while (ret == EOF); \ 2069 } while (0) 2070 2071/* 2072 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2073 * encapsulation of the data subject to Mode, Structure, and Type. 2074 * 2075 * NB: Form isn't handled. 2076 */ 2077static int 2078send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2079{ 2080 int c, cp, filefd, netfd; 2081 char *buf; 2082 2083 STARTXFER; 2084 2085 switch (type) { 2086 2087 case TYPE_A: 2088 cp = EOF; 2089 for (;;) { 2090 c = getc(instr); 2091 CHECKOOB(return (-1)) 2092 else if (c == EOF && ferror(instr)) 2093 goto file_err; 2094 if (c == EOF) { 2095 if (ferror(instr)) { /* resume after OOB */ 2096 clearerr(instr); 2097 continue; 2098 } 2099 if (feof(instr)) /* EOF */ 2100 break; 2101 syslog(LOG_ERR, "Internal: impossible condition" 2102 " on file after getc()"); 2103 goto file_err; 2104 } 2105 if (c == '\n' && cp != '\r') { 2106 FTPD_PUTC('\r', outstr, data_err); 2107 byte_count++; 2108 } 2109 FTPD_PUTC(c, outstr, data_err); 2110 byte_count++; 2111 cp = c; 2112 } 2113#ifdef notyet /* BSD stdio isn't ready for that */ 2114 while (fflush(outstr) == EOF) { 2115 CHECKOOB(return (-1)) 2116 else 2117 goto data_err; 2118 clearerr(outstr); 2119 } 2120 ENDXFER; 2121#else 2122 ENDXFER; 2123 if (fflush(outstr) == EOF) 2124 goto data_err; 2125#endif 2126 reply(226, "Transfer complete."); 2127 return (0); 2128 2129 case TYPE_I: 2130 case TYPE_L: 2131 /* 2132 * isreg is only set if we are not doing restart and we 2133 * are sending a regular file 2134 */ 2135 netfd = fileno(outstr); 2136 filefd = fileno(instr); 2137 2138#if (!defined(__BEOS__) && !defined(__HAIKU__)) 2139 if (isreg) { 2140 char *msg = "Transfer complete."; 2141 off_t cnt, offset; 2142 int err; 2143 2144 cnt = offset = 0; 2145 2146 while (filesize > 0) { 2147 err = sendfile(filefd, netfd, offset, 0, 2148 NULL, &cnt, 0); 2149 /* 2150 * Calculate byte_count before OOB processing. 2151 * It can be used in myoob() later. 2152 */ 2153 byte_count += cnt; 2154 offset += cnt; 2155 filesize -= cnt; 2156 CHECKOOB(return (-1)) 2157 else if (err == -1) { 2158 if (errno != EINTR && 2159 cnt == 0 && offset == 0) 2160 goto oldway; 2161 goto data_err; 2162 } 2163 if (err == -1) /* resume after OOB */ 2164 continue; 2165 /* 2166 * We hit the EOF prematurely. 2167 * Perhaps the file was externally truncated. 2168 */ 2169 if (cnt == 0) { 2170 msg = "Transfer finished due to " 2171 "premature end of file."; 2172 break; 2173 } 2174 } 2175 ENDXFER; 2176 reply(226, msg); 2177 return (0); 2178 } 2179 2180oldway: 2181#endif /* !__BEOS__ */ 2182 if ((buf = malloc(blksize)) == NULL) { 2183 ENDXFER; 2184 reply(451, "Ran out of memory."); 2185 return (-1); 2186 } 2187 2188 for (;;) { 2189 int cnt, len; 2190 char *bp; 2191 2192 cnt = read(filefd, buf, blksize); 2193 CHECKOOB(free(buf); return (-1)) 2194 else if (cnt < 0) { 2195 free(buf); 2196 goto file_err; 2197 } 2198 if (cnt < 0) /* resume after OOB */ 2199 continue; 2200 if (cnt == 0) /* EOF */ 2201 break; 2202 for (len = cnt, bp = buf; len > 0;) { 2203 cnt = write(netfd, bp, len); 2204 CHECKOOB(free(buf); return (-1)) 2205 else if (cnt < 0) { 2206 free(buf); 2207 goto data_err; 2208 } 2209 if (cnt <= 0) 2210 continue; 2211 len -= cnt; 2212 bp += cnt; 2213 byte_count += cnt; 2214 } 2215 } 2216 ENDXFER; 2217 free(buf); 2218 reply(226, "Transfer complete."); 2219 return (0); 2220 default: 2221 ENDXFER; 2222 reply(550, "Unimplemented TYPE %d in send_data.", type); 2223 return (-1); 2224 } 2225 2226data_err: 2227 ENDXFER; 2228 perror_reply(426, "Data connection"); 2229 return (-1); 2230 2231file_err: 2232 ENDXFER; 2233 perror_reply(551, "Error on input file"); 2234 return (-1); 2235} 2236 2237/* 2238 * Transfer data from peer to "outstr" using the appropriate encapulation of 2239 * the data subject to Mode, Structure, and Type. 2240 * 2241 * N.B.: Form isn't handled. 2242 */ 2243static int 2244receive_data(FILE *instr, FILE *outstr) 2245{ 2246 int c, cp; 2247 int bare_lfs = 0; 2248 2249 STARTXFER; 2250 2251 switch (type) { 2252 2253 case TYPE_I: 2254 case TYPE_L: 2255 for (;;) { 2256 int cnt, len; 2257 char *bp; 2258 char buf[BUFSIZ]; 2259 2260 cnt = read(fileno(instr), buf, sizeof(buf)); 2261 CHECKOOB(return (-1)) 2262 else if (cnt < 0) 2263 goto data_err; 2264 if (cnt < 0) /* resume after OOB */ 2265 continue; 2266 if (cnt == 0) /* EOF */ 2267 break; 2268 for (len = cnt, bp = buf; len > 0;) { 2269 cnt = write(fileno(outstr), bp, len); 2270 CHECKOOB(return (-1)) 2271 else if (cnt < 0) 2272 goto file_err; 2273 if (cnt <= 0) 2274 continue; 2275 len -= cnt; 2276 bp += cnt; 2277 byte_count += cnt; 2278 } 2279 } 2280 ENDXFER; 2281 return (0); 2282 2283 case TYPE_E: 2284 ENDXFER; 2285 reply(553, "TYPE E not implemented."); 2286 return (-1); 2287 2288 case TYPE_A: 2289 cp = EOF; 2290 for (;;) { 2291 c = getc(instr); 2292 CHECKOOB(return (-1)) 2293 else if (c == EOF && ferror(instr)) 2294 goto data_err; 2295 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2296 clearerr(instr); 2297 continue; 2298 } 2299 2300 if (cp == '\r') { 2301 if (c != '\n') 2302 FTPD_PUTC('\r', outstr, file_err); 2303 } else 2304 if (c == '\n') 2305 bare_lfs++; 2306 if (c == '\r') { 2307 byte_count++; 2308 cp = c; 2309 continue; 2310 } 2311 2312 /* Check for EOF here in order not to lose last \r. */ 2313 if (c == EOF) { 2314 if (feof(instr)) /* EOF */ 2315 break; 2316 syslog(LOG_ERR, "Internal: impossible condition" 2317 " on data stream after getc()"); 2318 goto data_err; 2319 } 2320 2321 byte_count++; 2322 FTPD_PUTC(c, outstr, file_err); 2323 cp = c; 2324 } 2325#ifdef notyet /* BSD stdio isn't ready for that */ 2326 while (fflush(outstr) == EOF) { 2327 CHECKOOB(return (-1)) 2328 else 2329 goto file_err; 2330 clearerr(outstr); 2331 } 2332 ENDXFER; 2333#else 2334 ENDXFER; 2335 if (fflush(outstr) == EOF) 2336 goto file_err; 2337#endif 2338 if (bare_lfs) { 2339 lreply(226, 2340 "WARNING! %d bare linefeeds received in ASCII mode.", 2341 bare_lfs); 2342 (void)printf(" File may not have transferred correctly.\r\n"); 2343 } 2344 return (0); 2345 default: 2346 ENDXFER; 2347 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2348 return (-1); 2349 } 2350 2351data_err: 2352 ENDXFER; 2353 perror_reply(426, "Data connection"); 2354 return (-1); 2355 2356file_err: 2357 ENDXFER; 2358 perror_reply(452, "Error writing to file"); 2359 return (-1); 2360} 2361 2362void 2363statfilecmd(char *filename) 2364{ 2365 FILE *fin; 2366 int atstart; 2367 int c, code; 2368 char line[LINE_MAX]; 2369 struct stat st; 2370 2371 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2372 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2373 fin = ftpd_popen(line, "r"); 2374 lreply(code, "Status of %s:", filename); 2375 atstart = 1; 2376 while ((c = getc(fin)) != EOF) { 2377 if (c == '\n') { 2378 if (ferror(stdout)){ 2379 perror_reply(421, "Control connection"); 2380 (void) ftpd_pclose(fin); 2381 dologout(1); 2382 /* NOTREACHED */ 2383 } 2384 if (ferror(fin)) { 2385 perror_reply(551, filename); 2386 (void) ftpd_pclose(fin); 2387 return; 2388 } 2389 (void) putc('\r', stdout); 2390 } 2391 /* 2392 * RFC 959 says neutral text should be prepended before 2393 * a leading 3-digit number followed by whitespace, but 2394 * many ftp clients can be confused by any leading digits, 2395 * as a matter of fact. 2396 */ 2397 if (atstart && isdigit(c)) 2398 (void) putc(' ', stdout); 2399 (void) putc(c, stdout); 2400 atstart = (c == '\n'); 2401 } 2402 (void) ftpd_pclose(fin); 2403 reply(code, "End of status."); 2404} 2405 2406void 2407statcmd(void) 2408{ 2409 union sockunion *su; 2410 u_char *a, *p; 2411 char hname[NI_MAXHOST]; 2412 int ispassive; 2413 2414 if (hostinfo) { 2415 lreply(211, "%s FTP server status:", hostname); 2416 printf(" %s\r\n", version); 2417 } else 2418 lreply(211, "FTP server status:"); 2419 printf(" Connected to %s", remotehost); 2420 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2421 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2422 hname[sizeof(hname) - 1] = 0; 2423 if (strcmp(hname, remotehost) != 0) 2424 printf(" (%s)", hname); 2425 } 2426 printf("\r\n"); 2427 if (logged_in) { 2428 if (guest) 2429 printf(" Logged in anonymously\r\n"); 2430 else 2431 printf(" Logged in as %s\r\n", pw->pw_name); 2432 } else if (askpasswd) 2433 printf(" Waiting for password\r\n"); 2434 else 2435 printf(" Waiting for user name\r\n"); 2436 printf(" TYPE: %s", typenames[type]); 2437 if (type == TYPE_A || type == TYPE_E) 2438 printf(", FORM: %s", formnames[form]); 2439 if (type == TYPE_L) 2440#if CHAR_BIT == 8 2441 printf(" %d", CHAR_BIT); 2442#else 2443 printf(" %d", bytesize); /* need definition! */ 2444#endif 2445 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2446 strunames[stru], modenames[mode]); 2447 if (data != -1) 2448 printf(" Data connection open\r\n"); 2449 else if (pdata != -1) { 2450 ispassive = 1; 2451 su = &pasv_addr; 2452 goto printaddr; 2453 } else if (usedefault == 0) { 2454 ispassive = 0; 2455 su = &data_dest; 2456printaddr: 2457#define UC(b) (((int) b) & 0xff) 2458 if (epsvall) { 2459 printf(" EPSV only mode (EPSV ALL)\r\n"); 2460 goto epsvonly; 2461 } 2462 2463 /* PORT/PASV */ 2464 if (su->su_family == AF_INET) { 2465 a = (u_char *) &su->su_sin.sin_addr; 2466 p = (u_char *) &su->su_sin.sin_port; 2467 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2468 ispassive ? "PASV" : "PORT", 2469 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2470 UC(p[0]), UC(p[1])); 2471 } 2472 2473 /* LPRT/LPSV */ 2474 { 2475 int alen, af, i; 2476 2477 switch (su->su_family) { 2478 case AF_INET: 2479 a = (u_char *) &su->su_sin.sin_addr; 2480 p = (u_char *) &su->su_sin.sin_port; 2481 alen = sizeof(su->su_sin.sin_addr); 2482 af = 4; 2483 break; 2484 case AF_INET6: 2485 a = (u_char *) &su->su_sin6.sin6_addr; 2486 p = (u_char *) &su->su_sin6.sin6_port; 2487 alen = sizeof(su->su_sin6.sin6_addr); 2488 af = 6; 2489 break; 2490 default: 2491 af = 0; 2492 break; 2493 } 2494 if (af) { 2495 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2496 af, alen); 2497 for (i = 0; i < alen; i++) 2498 printf("%d,", UC(a[i])); 2499 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2500 } 2501 } 2502 2503epsvonly:; 2504 /* EPRT/EPSV */ 2505 { 2506 int af; 2507 2508 switch (su->su_family) { 2509 case AF_INET: 2510 af = 1; 2511 break; 2512 case AF_INET6: 2513 af = 2; 2514 break; 2515 default: 2516 af = 0; 2517 break; 2518 } 2519 if (af) { 2520 union sockunion tmp; 2521 2522 tmp = *su; 2523 if (tmp.su_family == AF_INET6) 2524 tmp.su_sin6.sin6_scope_id = 0; 2525 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2526 hname, sizeof(hname) - 1, NULL, 0, 2527 NI_NUMERICHOST)) { 2528 hname[sizeof(hname) - 1] = 0; 2529 printf(" %s |%d|%s|%d|\r\n", 2530 ispassive ? "EPSV" : "EPRT", 2531 af, hname, htons(tmp.su_port)); 2532 } 2533 } 2534 } 2535#undef UC 2536 } else 2537 printf(" No data connection\r\n"); 2538 reply(211, "End of status."); 2539} 2540 2541void 2542fatalerror(char *s) 2543{ 2544 2545 reply(451, "Error in server: %s", s); 2546 reply(221, "Closing connection due to server error."); 2547 dologout(0); 2548 /* NOTREACHED */ 2549} 2550 2551void 2552reply(int n, const char *fmt, ...) 2553{ 2554 va_list ap; 2555 2556 (void)printf("%d ", n); 2557 va_start(ap, fmt); 2558 (void)vprintf(fmt, ap); 2559 va_end(ap); 2560 (void)printf("\r\n"); 2561 (void)fflush(stdout); 2562 if (ftpdebug) { 2563 syslog(LOG_DEBUG, "<--- %d ", n); 2564 va_start(ap, fmt); 2565 vsyslog(LOG_DEBUG, fmt, ap); 2566 va_end(ap); 2567 } 2568} 2569 2570void 2571lreply(int n, const char *fmt, ...) 2572{ 2573 va_list ap; 2574 2575 (void)printf("%d- ", n); 2576 va_start(ap, fmt); 2577 (void)vprintf(fmt, ap); 2578 va_end(ap); 2579 (void)printf("\r\n"); 2580 (void)fflush(stdout); 2581 if (ftpdebug) { 2582 syslog(LOG_DEBUG, "<--- %d- ", n); 2583 va_start(ap, fmt); 2584 vsyslog(LOG_DEBUG, fmt, ap); 2585 va_end(ap); 2586 } 2587} 2588 2589static void 2590ack(char *s) 2591{ 2592 2593 reply(250, "%s command successful.", s); 2594} 2595 2596void 2597nack(char *s) 2598{ 2599 2600 reply(502, "%s command not implemented.", s); 2601} 2602 2603/* ARGSUSED */ 2604void 2605yyerror(char *s) 2606{ 2607 char *cp; 2608 2609 if ((cp = strchr(cbuf,'\n'))) 2610 *cp = '\0'; 2611 reply(500, "%s: command not understood.", cbuf); 2612} 2613 2614void 2615delete(char *name) 2616{ 2617 struct stat st; 2618 2619 LOGCMD("delete", name); 2620 if (lstat(name, &st) < 0) { 2621 perror_reply(550, name); 2622 return; 2623 } 2624 if (S_ISDIR(st.st_mode)) { 2625 if (rmdir(name) < 0) { 2626 perror_reply(550, name); 2627 return; 2628 } 2629 goto done; 2630 } 2631 if (guest && noguestmod) { 2632 reply(550, "Operation not permitted."); 2633 return; 2634 } 2635 if (unlink(name) < 0) { 2636 perror_reply(550, name); 2637 return; 2638 } 2639done: 2640 ack("DELE"); 2641} 2642 2643void 2644cwd(char *path) 2645{ 2646 2647 if (chdir(path) < 0) 2648 perror_reply(550, path); 2649 else 2650 ack("CWD"); 2651} 2652 2653void 2654makedir(char *name) 2655{ 2656 char *s; 2657 2658 LOGCMD("mkdir", name); 2659 if (guest && noguestmkd) 2660 reply(550, "Operation not permitted."); 2661 else if (mkdir(name, 0777) < 0) 2662 perror_reply(550, name); 2663 else { 2664 if ((s = doublequote(name)) == NULL) 2665 fatalerror("Ran out of memory."); 2666 reply(257, "\"%s\" directory created.", s); 2667 free(s); 2668 } 2669} 2670 2671void 2672removedir(char *name) 2673{ 2674 2675 LOGCMD("rmdir", name); 2676 if (rmdir(name) < 0) 2677 perror_reply(550, name); 2678 else 2679 ack("RMD"); 2680} 2681 2682void 2683pwd(void) 2684{ 2685 char *s, path[MAXPATHLEN + 1]; 2686 2687 if (getcwd(path, sizeof(path)) == NULL) 2688 perror_reply(550, "Get current directory"); 2689 else { 2690 if ((s = doublequote(path)) == NULL) 2691 fatalerror("Ran out of memory."); 2692 reply(257, "\"%s\" is current directory.", s); 2693 free(s); 2694 } 2695} 2696 2697char * 2698renamefrom(char *name) 2699{ 2700 struct stat st; 2701 2702 if (guest && noguestmod) { 2703 reply(550, "Operation not permitted."); 2704 return (NULL); 2705 } 2706 if (lstat(name, &st) < 0) { 2707 perror_reply(550, name); 2708 return (NULL); 2709 } 2710 reply(350, "File exists, ready for destination name."); 2711 return (name); 2712} 2713 2714void 2715renamecmd(char *from, char *to) 2716{ 2717 struct stat st; 2718 2719 LOGCMD2("rename", from, to); 2720 2721 if (guest && (stat(to, &st) == 0)) { 2722 reply(550, "%s: permission denied.", to); 2723 return; 2724 } 2725 2726 if (rename(from, to) < 0) 2727 perror_reply(550, "rename"); 2728 else 2729 ack("RNTO"); 2730} 2731 2732static void 2733dolog(struct sockaddr *who) 2734{ 2735 char who_name[NI_MAXHOST]; 2736 2737 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2738 remotehost[sizeof(remotehost) - 1] = 0; 2739 if (getnameinfo(who, who->sa_len, 2740 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2741 *who_name = 0; 2742 who_name[sizeof(who_name) - 1] = 0; 2743 2744#ifdef SETPROCTITLE 2745#ifdef VIRTUAL_HOSTING 2746 if (thishost != firsthost) 2747 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2748 remotehost, hostname); 2749 else 2750#endif 2751 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2752 remotehost); 2753 setproctitle("%s", proctitle); 2754#endif /* SETPROCTITLE */ 2755 2756 if (logging) { 2757#ifdef VIRTUAL_HOSTING 2758 if (thishost != firsthost) 2759 syslog(LOG_INFO, "connection from %s (%s) to %s", 2760 remotehost, who_name, hostname); 2761 else 2762#endif 2763 syslog(LOG_INFO, "connection from %s (%s)", 2764 remotehost, who_name); 2765 } 2766} 2767 2768/* 2769 * Record logout in wtmp file 2770 * and exit with supplied status. 2771 */ 2772void 2773dologout(int status) 2774{ 2775 2776 if (logged_in && dowtmp) { 2777 (void) seteuid(0); 2778 ftpd_logwtmp(ttyline, "", NULL); 2779 } 2780 /* beware of flushing buffers after a SIGPIPE */ 2781 _exit(status); 2782} 2783 2784static void 2785sigurg(int signo) 2786{ 2787 2788 recvurg = 1; 2789} 2790 2791static void 2792maskurg(int flag) 2793{ 2794 int oerrno; 2795 sigset_t sset; 2796 2797 if (!transflag) { 2798 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2799 return; 2800 } 2801 oerrno = errno; 2802 sigemptyset(&sset); 2803 sigaddset(&sset, SIGURG); 2804 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2805 errno = oerrno; 2806} 2807 2808static void 2809flagxfer(int flag) 2810{ 2811 2812 if (flag) { 2813 if (transflag) 2814 syslog(LOG_ERR, "Internal: flagxfer(1): " 2815 "transfer already under way"); 2816 transflag = 1; 2817 maskurg(0); 2818 recvurg = 0; 2819 } else { 2820 if (!transflag) 2821 syslog(LOG_ERR, "Internal: flagxfer(0): " 2822 "no active transfer"); 2823 maskurg(1); 2824 transflag = 0; 2825 } 2826} 2827 2828/* 2829 * Returns 0 if OK to resume or -1 if abort requested. 2830 */ 2831static int 2832myoob(void) 2833{ 2834 char *cp; 2835 2836 if (!transflag) { 2837 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2838 return (0); 2839 } 2840 cp = tmpline; 2841 if (ftpd_getline(cp, 7, stdin) == NULL) { 2842 reply(221, "You could at least say goodbye."); 2843 dologout(0); 2844 } 2845 upper(cp); 2846 if (strcmp(cp, "ABOR\r\n") == 0) { 2847 tmpline[0] = '\0'; 2848 reply(426, "Transfer aborted. Data connection closed."); 2849 reply(226, "Abort successful."); 2850 return (-1); 2851 } 2852 if (strcmp(cp, "STAT\r\n") == 0) { 2853 tmpline[0] = '\0'; 2854 if (file_size != -1) 2855 reply(213, "Status: %lld of %lld bytes transferred.", 2856 (intmax_t)byte_count, (intmax_t)file_size); 2857 else 2858 reply(213, "Status: %lld bytes transferred.", 2859 (intmax_t)byte_count); 2860 } 2861 return (0); 2862} 2863 2864/* 2865 * Note: a response of 425 is not mentioned as a possible response to 2866 * the PASV command in RFC959. However, it has been blessed as 2867 * a legitimate response by Jon Postel in a telephone conversation 2868 * with Rick Adams on 25 Jan 89. 2869 */ 2870void 2871passive(void) 2872{ 2873 socklen_t len; 2874 int on; 2875 char *p, *a; 2876 2877 if (pdata >= 0) /* close old port if one set */ 2878 close(pdata); 2879 2880 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2881 if (pdata < 0) { 2882 perror_reply(425, "Can't open passive connection"); 2883 return; 2884 } 2885 on = 1; 2886 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2887 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2888 2889 (void) seteuid(0); 2890 2891#ifdef IP_PORTRANGE 2892 if (ctrl_addr.su_family == AF_INET) { 2893 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2894 : IP_PORTRANGE_DEFAULT; 2895 2896 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2897 &on, sizeof(on)) < 0) 2898 goto pasv_error; 2899 } 2900#endif 2901#ifdef IPV6_PORTRANGE 2902 if (ctrl_addr.su_family == AF_INET6) { 2903 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2904 : IPV6_PORTRANGE_DEFAULT; 2905 2906 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2907 &on, sizeof(on)) < 0) 2908 goto pasv_error; 2909 } 2910#endif 2911 2912 pasv_addr = ctrl_addr; 2913 pasv_addr.su_port = 0; 2914 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2915 goto pasv_error; 2916 2917 (void) seteuid(pw->pw_uid); 2918 2919 len = sizeof(pasv_addr); 2920 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2921 goto pasv_error; 2922 if (listen(pdata, 1) < 0) 2923 goto pasv_error; 2924 if (pasv_addr.su_family == AF_INET) 2925 a = (char *) &pasv_addr.su_sin.sin_addr; 2926#ifdef HAVE_AF_INET6 2927 else if (pasv_addr.su_family == AF_INET6 && 2928 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2929 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2930#endif 2931 else 2932 goto pasv_error; 2933 2934 p = (char *) &pasv_addr.su_port; 2935 2936#define UC(b) (((int) b) & 0xff) 2937 2938 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2939 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2940 return; 2941 2942pasv_error: 2943 (void) seteuid(pw->pw_uid); 2944 (void) close(pdata); 2945 pdata = -1; 2946 perror_reply(425, "Can't open passive connection"); 2947 return; 2948} 2949 2950/* 2951 * Long Passive defined in RFC 1639. 2952 * 228 Entering Long Passive Mode 2953 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2954 */ 2955 2956void 2957long_passive(char *cmd, int pf) 2958{ 2959 socklen_t len; 2960 int on; 2961 char *p, *a; 2962 2963 if (pdata >= 0) /* close old port if one set */ 2964 close(pdata); 2965 2966 if (pf != PF_UNSPEC) { 2967 if (ctrl_addr.su_family != pf) { 2968 switch (ctrl_addr.su_family) { 2969 case AF_INET: 2970 pf = 1; 2971 break; 2972 case AF_INET6: 2973 pf = 2; 2974 break; 2975 default: 2976 pf = 0; 2977 break; 2978 } 2979 /* 2980 * XXX 2981 * only EPRT/EPSV ready clients will understand this 2982 */ 2983 if (strcmp(cmd, "EPSV") == 0 && pf) { 2984 reply(522, "Network protocol mismatch, " 2985 "use (%d)", pf); 2986 } else 2987 reply(501, "Network protocol mismatch."); /*XXX*/ 2988 2989 return; 2990 } 2991 } 2992 2993 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2994 if (pdata < 0) { 2995 perror_reply(425, "Can't open passive connection"); 2996 return; 2997 } 2998 on = 1; 2999 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 3000 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 3001 3002 (void) seteuid(0); 3003 3004 pasv_addr = ctrl_addr; 3005 pasv_addr.su_port = 0; 3006 len = pasv_addr.su_len; 3007 3008#ifdef IP_PORTRANGE 3009 if (ctrl_addr.su_family == AF_INET) { 3010 on = restricted_data_ports ? IP_PORTRANGE_HIGH 3011 : IP_PORTRANGE_DEFAULT; 3012 3013 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 3014 &on, sizeof(on)) < 0) 3015 goto pasv_error; 3016 } 3017#endif 3018#ifdef IPV6_PORTRANGE 3019 if (ctrl_addr.su_family == AF_INET6) { 3020 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 3021 : IPV6_PORTRANGE_DEFAULT; 3022 3023 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 3024 &on, sizeof(on)) < 0) 3025 goto pasv_error; 3026 } 3027#endif 3028 3029 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 3030 goto pasv_error; 3031 3032 (void) seteuid(pw->pw_uid); 3033 3034 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 3035 goto pasv_error; 3036 if (listen(pdata, 1) < 0) 3037 goto pasv_error; 3038 3039#define UC(b) (((int) b) & 0xff) 3040 3041 if (strcmp(cmd, "LPSV") == 0) { 3042 p = (char *)&pasv_addr.su_port; 3043 switch (pasv_addr.su_family) { 3044 case AF_INET: 3045 a = (char *) &pasv_addr.su_sin.sin_addr; 3046#ifdef HAVE_AF_INET6 3047 v4_reply: 3048#endif 3049 reply(228, 3050"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3051 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3052 2, UC(p[0]), UC(p[1])); 3053 return; 3054#ifdef HAVE_AF_INET6 3055 case AF_INET6: 3056 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3057 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3058 goto v4_reply; 3059 } 3060 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3061 reply(228, 3062"Entering Long Passive Mode " 3063"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3064 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3065 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3066 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3067 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3068 2, UC(p[0]), UC(p[1])); 3069 return; 3070#endif 3071 } 3072 } else if (strcmp(cmd, "EPSV") == 0) { 3073 switch (pasv_addr.su_family) { 3074 case AF_INET: 3075 case AF_INET6: 3076 reply(229, "Entering Extended Passive Mode (|||%d|)", 3077 ntohs(pasv_addr.su_port)); 3078 return; 3079 } 3080 } else { 3081 /* more proper error code? */ 3082 } 3083 3084pasv_error: 3085 (void) seteuid(pw->pw_uid); 3086 (void) close(pdata); 3087 pdata = -1; 3088 perror_reply(425, "Can't open passive connection"); 3089 return; 3090} 3091 3092/* 3093 * Generate unique name for file with basename "local" 3094 * and open the file in order to avoid possible races. 3095 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3096 * Return descriptor to the file, set "name" to its name. 3097 * 3098 * Generates failure reply on error. 3099 */ 3100static int 3101guniquefd(char *local, char **name) 3102{ 3103 static char new[MAXPATHLEN]; 3104 struct stat st; 3105 char *cp; 3106 int count; 3107 int fd; 3108 3109 cp = strrchr(local, '/'); 3110 if (cp) 3111 *cp = '\0'; 3112 if (stat(cp ? local : ".", &st) < 0) { 3113 perror_reply(553, cp ? local : "."); 3114 return (-1); 3115 } 3116 if (cp) { 3117 /* 3118 * Let not overwrite dirname with counter suffix. 3119 * -4 is for /nn\0 3120 * In this extreme case dot won't be put in front of suffix. 3121 */ 3122 if (strlen(local) > sizeof(new) - 4) { 3123 reply(553, "Pathname too long."); 3124 return (-1); 3125 } 3126 *cp = '/'; 3127 } 3128 /* -4 is for the .nn<null> we put on the end below */ 3129 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3130 cp = new + strlen(new); 3131 /* 3132 * Don't generate dotfile unless requested explicitly. 3133 * This covers the case when basename gets truncated off 3134 * by buffer size. 3135 */ 3136 if (cp > new && cp[-1] != '/') 3137 *cp++ = '.'; 3138 for (count = 0; count < 100; count++) { 3139 /* At count 0 try unmodified name */ 3140 if (count) 3141 (void)sprintf(cp, "%d", count); 3142 if ((fd = open(count ? new : local, 3143 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3144 *name = count ? new : local; 3145 return (fd); 3146 } 3147 if (errno != EEXIST) { 3148 perror_reply(553, count ? new : local); 3149 return (-1); 3150 } 3151 } 3152 reply(452, "Unique file name cannot be created."); 3153 return (-1); 3154} 3155 3156/* 3157 * Format and send reply containing system error number. 3158 */ 3159void 3160perror_reply(int code, char *string) 3161{ 3162 3163 reply(code, "%s: %s.", string, strerror(errno)); 3164} 3165 3166static char *onefile[] = { 3167 "", 3168 0 3169}; 3170 3171void 3172send_file_list(char *whichf) 3173{ 3174 struct stat st; 3175 DIR *dirp = NULL; 3176 struct dirent *dir; 3177 FILE *dout = NULL; 3178 char **dirlist, *dirname; 3179 int simple = 0; 3180 int freeglob = 0; 3181 glob_t gl; 3182 3183 if (strpbrk(whichf, "~{[*?") != NULL) { 3184 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3185 3186 memset(&gl, 0, sizeof(gl)); 3187 gl.gl_matchc = MAXGLOBARGS; 3188 flags |= GLOB_LIMIT; 3189 freeglob = 1; 3190 if (glob(whichf, flags, 0, &gl)) { 3191 reply(550, "No matching files found."); 3192 goto out; 3193 } else if (gl.gl_pathc == 0) { 3194 errno = ENOENT; 3195 perror_reply(550, whichf); 3196 goto out; 3197 } 3198 dirlist = gl.gl_pathv; 3199 } else { 3200 onefile[0] = whichf; 3201 dirlist = onefile; 3202 simple = 1; 3203 } 3204 3205 while ((dirname = *dirlist++)) { 3206 if (stat(dirname, &st) < 0) { 3207 /* 3208 * If user typed "ls -l", etc, and the client 3209 * used NLST, do what the user meant. 3210 */ 3211 if (dirname[0] == '-' && *dirlist == NULL && 3212 dout == NULL) 3213 retrieve(_PATH_LS " %s", dirname); 3214 else 3215 perror_reply(550, whichf); 3216 goto out; 3217 } 3218 3219 if (S_ISREG(st.st_mode)) { 3220 if (dout == NULL) { 3221 dout = dataconn("file list", -1, "w"); 3222 if (dout == NULL) 3223 goto out; 3224 STARTXFER; 3225 } 3226 START_UNSAFE; 3227 fprintf(dout, "%s%s\n", dirname, 3228 type == TYPE_A ? "\r" : ""); 3229 END_UNSAFE; 3230 if (ferror(dout)) 3231 goto data_err; 3232 byte_count += strlen(dirname) + 3233 (type == TYPE_A ? 2 : 1); 3234 CHECKOOB(goto abrt); 3235 continue; 3236 } else if (!S_ISDIR(st.st_mode)) 3237 continue; 3238 3239 if ((dirp = opendir(dirname)) == NULL) 3240 continue; 3241 3242 while ((dir = readdir(dirp)) != NULL) { 3243 char nbuf[MAXPATHLEN]; 3244 3245 CHECKOOB(goto abrt); 3246 3247#if (defined(__BEOS__) || defined(__HAIKU__)) 3248 if (dir->d_name[0] == '.' && dir->d_name[1] == '\0') 3249 continue; 3250 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3251 dir->d_name[2] == '\0') 3252 continue; 3253#else 3254 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3255 continue; 3256 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3257 dir->d_namlen == 2) 3258 continue; 3259#endif 3260 3261 snprintf(nbuf, sizeof(nbuf), 3262 "%s/%s", dirname, dir->d_name); 3263 3264 /* 3265 * We have to do a stat to insure it's 3266 * not a directory or special file. 3267 */ 3268 if (simple || (stat(nbuf, &st) == 0 && 3269 S_ISREG(st.st_mode))) { 3270 if (dout == NULL) { 3271 dout = dataconn("file list", -1, "w"); 3272 if (dout == NULL) 3273 goto out; 3274 STARTXFER; 3275 } 3276 START_UNSAFE; 3277 if (nbuf[0] == '.' && nbuf[1] == '/') 3278 fprintf(dout, "%s%s\n", &nbuf[2], 3279 type == TYPE_A ? "\r" : ""); 3280 else 3281 fprintf(dout, "%s%s\n", nbuf, 3282 type == TYPE_A ? "\r" : ""); 3283 END_UNSAFE; 3284 if (ferror(dout)) 3285 goto data_err; 3286 byte_count += strlen(nbuf) + 3287 (type == TYPE_A ? 2 : 1); 3288 CHECKOOB(goto abrt); 3289 } 3290 } 3291 (void) closedir(dirp); 3292 dirp = NULL; 3293 } 3294 3295 if (dout == NULL) 3296 reply(550, "No files found."); 3297 else if (ferror(dout)) 3298data_err: perror_reply(550, "Data connection"); 3299 else 3300 reply(226, "Transfer complete."); 3301out: 3302 if (dout) { 3303 ENDXFER; 3304abrt: 3305 (void) fclose(dout); 3306 data = -1; 3307 pdata = -1; 3308 } 3309 if (dirp) 3310 (void) closedir(dirp); 3311 if (freeglob) { 3312 freeglob = 0; 3313 globfree(&gl); 3314 } 3315} 3316 3317void 3318reapchild(int signo) 3319{ 3320 while (waitpid(-1, NULL, WNOHANG) > 0); 3321} 3322 3323#ifdef OLD_SETPROCTITLE 3324/* 3325 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3326 * Warning, since this is usually started from inetd.conf, it often doesn't 3327 * have much of an environment or arglist to overwrite. 3328 */ 3329void 3330setproctitle(const char *fmt, ...) 3331{ 3332 int i; 3333 va_list ap; 3334 char *p, *bp, ch; 3335 char buf[LINE_MAX]; 3336 3337 va_start(ap, fmt); 3338 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3339 3340 /* make ps print our process name */ 3341 p = Argv[0]; 3342 *p++ = '-'; 3343 3344 i = strlen(buf); 3345 if (i > LastArgv - p - 2) { 3346 i = LastArgv - p - 2; 3347 buf[i] = '\0'; 3348 } 3349 bp = buf; 3350 while (ch = *bp++) 3351 if (ch != '\n' && ch != '\r') 3352 *p++ = ch; 3353 while (p < LastArgv) 3354 *p++ = ' '; 3355} 3356#endif /* OLD_SETPROCTITLE */ 3357 3358static void 3359appendf(char **strp, char *fmt, ...) 3360{ 3361 va_list ap; 3362 char *ostr, *p; 3363 3364 va_start(ap, fmt); 3365 vasprintf(&p, fmt, ap); 3366 va_end(ap); 3367 if (p == NULL) 3368 fatalerror("Ran out of memory."); 3369 if (*strp == NULL) 3370 *strp = p; 3371 else { 3372 ostr = *strp; 3373 asprintf(strp, "%s%s", ostr, p); 3374 if (*strp == NULL) 3375 fatalerror("Ran out of memory."); 3376 free(ostr); 3377 } 3378} 3379 3380static void 3381logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3382{ 3383 char *msg = NULL; 3384 char wd[MAXPATHLEN + 1]; 3385 3386 if (logging <= 1) 3387 return; 3388 3389 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3390 strcpy(wd, strerror(errno)); 3391 3392 appendf(&msg, "%s", cmd); 3393 if (file1) 3394 appendf(&msg, " %s", file1); 3395 if (file2) 3396 appendf(&msg, " %s", file2); 3397 if (cnt >= 0) 3398 appendf(&msg, " = %lld bytes", (intmax_t)cnt); 3399 appendf(&msg, " (wd: %s", wd); 3400 if (guest || dochroot) 3401 appendf(&msg, "; chrooted"); 3402 appendf(&msg, ")"); 3403 syslog(LOG_INFO, "%s", msg); 3404 free(msg); 3405} 3406 3407static void 3408logxfer(char *name, off_t size, time_t start) 3409{ 3410 char buf[MAXPATHLEN + 1024]; 3411 char path[MAXPATHLEN + 1]; 3412 time_t now; 3413 3414 if (statfd >= 0) { 3415 time(&now); 3416 if (realpath(name, path) == NULL) { 3417 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3418 return; 3419 } 3420 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%lld!%ld\n", 3421 ctime(&now)+4, ident, remotehost, 3422 path, (intmax_t)size, 3423 (long)(now - start + (now == start))); 3424 write(statfd, buf, strlen(buf)); 3425 } 3426} 3427 3428static char * 3429doublequote(char *s) 3430{ 3431 int n; 3432 char *p, *s2; 3433 3434 for (p = s, n = 0; *p; p++) 3435 if (*p == '"') 3436 n++; 3437 3438 if ((s2 = malloc(p - s + n + 1)) == NULL) 3439 return (NULL); 3440 3441 for (p = s2; *s; s++, p++) { 3442 if ((*p = *s) == '"') 3443 *(++p) = '"'; 3444 } 3445 *p = '\0'; 3446 3447 return (s2); 3448} 3449 3450/* setup server socket for specified address family */ 3451/* if af is PF_UNSPEC more than one socket may be returned */ 3452/* the returned list is dynamically allocated, so caller needs to free it */ 3453static int * 3454socksetup(int af, char *bindname, const char *bindport) 3455{ 3456 struct addrinfo hints, *res, *r; 3457 int error, maxs, *s, *socks; 3458 const int on = 1; 3459 3460 memset(&hints, 0, sizeof(hints)); 3461 hints.ai_flags = AI_PASSIVE; 3462 hints.ai_family = af; 3463 hints.ai_socktype = SOCK_STREAM; 3464 error = getaddrinfo(bindname, bindport, &hints, &res); 3465 if (error) { 3466 syslog(LOG_ERR, "%s", gai_strerror(error)); 3467 if (error == EAI_SYSTEM) 3468 syslog(LOG_ERR, "%s", strerror(errno)); 3469 return NULL; 3470 } 3471 3472 /* Count max number of sockets we may open */ 3473 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3474 ; 3475 socks = malloc((maxs + 1) * sizeof(int)); 3476 if (!socks) { 3477 freeaddrinfo(res); 3478 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3479 return NULL; 3480 } 3481 3482 *socks = 0; /* num of sockets counter at start of array */ 3483 s = socks + 1; 3484 for (r = res; r; r = r->ai_next) { 3485 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3486 if (*s < 0) { 3487 syslog(LOG_DEBUG, "control socket: %m"); 3488 continue; 3489 } 3490 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3491 &on, sizeof(on)) < 0) 3492 syslog(LOG_WARNING, 3493 "control setsockopt (SO_REUSEADDR): %m"); 3494#ifdef HAVE_AF_INET6 3495 if (r->ai_family == AF_INET6) { 3496 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3497 &on, sizeof(on)) < 0) 3498 syslog(LOG_WARNING, 3499 "control setsockopt (IPV6_V6ONLY): %m"); 3500 } 3501#endif 3502 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3503 syslog(LOG_DEBUG, "control bind: %m"); 3504 close(*s); 3505 continue; 3506 } 3507 (*socks)++; 3508 s++; 3509 } 3510 3511 if (res) 3512 freeaddrinfo(res); 3513 3514 if (*socks == 0) { 3515 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3516 free(socks); 3517 return NULL; 3518 } 3519 return(socks); 3520} 3521