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