1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#if 0 33#ifndef lint 34static char copyright[] = 35"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37#endif /* not lint */ 38#endif 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 43#endif 44#endif /* not lint */ 45 46#include <sys/cdefs.h> 47__FBSDID("$FreeBSD$"); 48 49/* 50 * FTP server. 51 */ 52#include <sys/param.h> 53#include <sys/ioctl.h> 54#include <sys/mman.h> 55#include <sys/socket.h> 56#include <sys/stat.h> 57#include <sys/time.h> 58#include <sys/wait.h> 59 60#include <netinet/in.h> 61#include <netinet/in_systm.h> 62#include <netinet/ip.h> 63#include <netinet/tcp.h> 64 65#define FTP_NAMES 66#include <arpa/ftp.h> 67#include <arpa/inet.h> 68#include <arpa/telnet.h> 69 70#include <ctype.h> 71#include <dirent.h> 72#include <err.h> 73#include <errno.h> 74#include <fcntl.h> 75#include <glob.h> 76#include <limits.h> 77#include <netdb.h> 78#include <pwd.h> 79#include <grp.h> 80#include <opie.h> 81#include <signal.h> 82#include <stdint.h> 83#include <stdio.h> 84#include <stdlib.h> 85#include <string.h> 86#include <syslog.h> 87#include <time.h> 88#include <unistd.h> 89#include <libutil.h> 90#ifdef LOGIN_CAP 91#include <login_cap.h> 92#endif 93 94#ifdef USE_PAM 95#include <security/pam_appl.h> 96#endif 97 98#include "blacklist_client.h" 99#include "pathnames.h" 100#include "extern.h" 101 102#include <stdarg.h> 103 104static char version[] = "Version 6.00LS"; 105#undef main 106 107union sockunion ctrl_addr; 108union sockunion data_source; 109union sockunion data_dest; 110union sockunion his_addr; 111union sockunion pasv_addr; 112 113int daemon_mode; 114int data; 115int dataport; 116int hostinfo = 1; /* print host-specific info in messages */ 117int logged_in; 118struct passwd *pw; 119char *homedir; 120int ftpdebug; 121int timeout = 900; /* timeout after 15 minutes of inactivity */ 122int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 123int logging; 124int restricted_data_ports = 1; 125int paranoid = 1; /* be extra careful about security */ 126int anon_only = 0; /* Only anonymous ftp allowed */ 127int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 128int guest; 129int dochroot; 130char *chrootdir; 131int dowtmp = 1; 132int stats; 133int statfd = -1; 134int type; 135int form; 136int stru; /* avoid C keyword */ 137int mode; 138int usedefault = 1; /* for data transfers */ 139int pdata = -1; /* for passive mode */ 140int readonly = 0; /* Server is in readonly mode. */ 141int noepsv = 0; /* EPSV command is disabled. */ 142int noretr = 0; /* RETR command is disabled. */ 143int noguestretr = 0; /* RETR command is disabled for anon users. */ 144int noguestmkd = 0; /* MKD command is disabled for anon users. */ 145int noguestmod = 1; /* anon users may not modify existing files. */ 146int use_blacklist = 0; 147 148off_t file_size; 149off_t byte_count; 150#if !defined(CMASK) || CMASK == 0 151#undef CMASK 152#define CMASK 027 153#endif 154int defumask = CMASK; /* default umask value */ 155char tmpline[7]; 156char *hostname; 157int epsvall = 0; 158 159#ifdef VIRTUAL_HOSTING 160char *ftpuser; 161 162static struct ftphost { 163 struct ftphost *next; 164 struct addrinfo *hostinfo; 165 char *hostname; 166 char *anonuser; 167 char *statfile; 168 char *welcome; 169 char *loginmsg; 170} *thishost, *firsthost; 171 172#endif 173char remotehost[NI_MAXHOST]; 174char *ident = NULL; 175 176static char wtmpid[20]; 177 178#ifdef USE_PAM 179static int auth_pam(struct passwd**, const char*); 180pam_handle_t *pamh = NULL; 181#endif 182 183static struct opie opiedata; 184static char opieprompt[OPIE_CHALLENGE_MAX+1]; 185static int pwok; 186 187char *pid_file = NULL; /* means default location to pidfile(3) */ 188 189/* 190 * Limit number of pathnames that glob can return. 191 * A limit of 0 indicates the number of pathnames is unlimited. 192 */ 193#define MAXGLOBARGS 16384 194# 195 196/* 197 * Timeout intervals for retrying connections 198 * to hosts that don't accept PORT cmds. This 199 * is a kludge, but given the problems with TCP... 200 */ 201#define SWAITMAX 90 /* wait at most 90 seconds */ 202#define SWAITINT 5 /* interval between retries */ 203 204int swaitmax = SWAITMAX; 205int swaitint = SWAITINT; 206 207#ifdef SETPROCTITLE 208#ifdef OLD_SETPROCTITLE 209char **Argv = NULL; /* pointer to argument vector */ 210char *LastArgv = NULL; /* end of argv */ 211#endif /* OLD_SETPROCTITLE */ 212char proctitle[LINE_MAX]; /* initial part of title */ 213#endif /* SETPROCTITLE */ 214 215#define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 216#define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 217#define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 218 219static volatile sig_atomic_t recvurg; 220static int transflag; /* NB: for debugging only */ 221 222#define STARTXFER flagxfer(1) 223#define ENDXFER flagxfer(0) 224 225#define START_UNSAFE maskurg(1) 226#define END_UNSAFE maskurg(0) 227 228/* It's OK to put an `else' clause after this macro. */ 229#define CHECKOOB(action) \ 230 if (recvurg) { \ 231 recvurg = 0; \ 232 if (myoob()) { \ 233 ENDXFER; \ 234 action; \ 235 } \ 236 } 237 238#ifdef VIRTUAL_HOSTING 239static void inithosts(int); 240static void selecthost(union sockunion *); 241#endif 242static void ack(char *); 243static void sigurg(int); 244static void maskurg(int); 245static void flagxfer(int); 246static int myoob(void); 247static int checkuser(char *, char *, int, char **, int *); 248static FILE *dataconn(char *, off_t, char *); 249static void dolog(struct sockaddr *); 250static void end_login(void); 251static FILE *getdatasock(char *); 252static int guniquefd(char *, char **); 253static void lostconn(int); 254static void sigquit(int); 255static int receive_data(FILE *, FILE *); 256static int send_data(FILE *, FILE *, size_t, off_t, int); 257static struct passwd * 258 sgetpwnam(char *); 259static char *sgetsave(char *); 260static void reapchild(int); 261static void appendf(char **, char *, ...) __printflike(2, 3); 262static void logcmd(char *, char *, char *, off_t); 263static void logxfer(char *, off_t, time_t); 264static char *doublequote(char *); 265static int *socksetup(int, char *, const char *); 266 267int 268main(int argc, char *argv[], char **envp) 269{ 270 socklen_t addrlen; 271 int ch, on = 1, tos, s = STDIN_FILENO; 272 char *cp, line[LINE_MAX]; 273 FILE *fd; 274 char *bindname = NULL; 275 const char *bindport = "ftp"; 276 int family = AF_UNSPEC; 277 struct sigaction sa; 278 279 tzset(); /* in case no timezone database in ~ftp */ 280 sigemptyset(&sa.sa_mask); 281 sa.sa_flags = SA_RESTART; 282 283#ifdef OLD_SETPROCTITLE 284 /* 285 * Save start and extent of argv for setproctitle. 286 */ 287 Argv = argv; 288 while (*envp) 289 envp++; 290 LastArgv = envp[-1] + strlen(envp[-1]); 291#endif /* OLD_SETPROCTITLE */ 292 293 /* 294 * Prevent diagnostic messages from appearing on stderr. 295 * We run as a daemon or from inetd; in both cases, there's 296 * more reason in logging to syslog. 297 */ 298 (void) freopen(_PATH_DEVNULL, "w", stderr); 299 opterr = 0; 300 301 /* 302 * LOG_NDELAY sets up the logging connection immediately, 303 * necessary for anonymous ftp's that chroot and can't do it later. 304 */ 305 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 306 307 while ((ch = getopt(argc, argv, 308 "468a:ABdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 309 switch (ch) { 310 case '4': 311 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 312 break; 313 314 case '6': 315 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 316 break; 317 318 case '8': 319 assumeutf8 = 1; 320 break; 321 322 case 'a': 323 bindname = optarg; 324 break; 325 326 case 'A': 327 anon_only = 1; 328 break; 329 330 case 'B': 331#ifdef USE_BLACKLIST 332 use_blacklist = 1; 333#else 334 syslog(LOG_WARNING, "not compiled with USE_BLACKLIST support"); 335#endif 336 break; 337 338 case 'd': 339 ftpdebug++; 340 break; 341 342 case 'D': 343 daemon_mode++; 344 break; 345 346 case 'E': 347 noepsv = 1; 348 break; 349 350 case 'h': 351 hostinfo = 0; 352 break; 353 354 case 'l': 355 logging++; /* > 1 == extra logging */ 356 break; 357 358 case 'm': 359 noguestmod = 0; 360 break; 361 362 case 'M': 363 noguestmkd = 1; 364 break; 365 366 case 'o': 367 noretr = 1; 368 break; 369 370 case 'O': 371 noguestretr = 1; 372 break; 373 374 case 'p': 375 pid_file = optarg; 376 break; 377 378 case 'P': 379 bindport = optarg; 380 break; 381 382 case 'r': 383 readonly = 1; 384 break; 385 386 case 'R': 387 paranoid = 0; 388 break; 389 390 case 'S': 391 stats++; 392 break; 393 394 case 't': 395 timeout = atoi(optarg); 396 if (maxtimeout < timeout) 397 maxtimeout = timeout; 398 break; 399 400 case 'T': 401 maxtimeout = atoi(optarg); 402 if (timeout > maxtimeout) 403 timeout = maxtimeout; 404 break; 405 406 case 'u': 407 { 408 long val = 0; 409 410 val = strtol(optarg, &optarg, 8); 411 if (*optarg != '\0' || val < 0) 412 syslog(LOG_WARNING, "bad value for -u"); 413 else 414 defumask = val; 415 break; 416 } 417 case 'U': 418 restricted_data_ports = 0; 419 break; 420 421 case 'v': 422 ftpdebug++; 423 break; 424 425 case 'W': 426 dowtmp = 0; 427 break; 428 429 default: 430 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 431 break; 432 } 433 } 434 435 /* handle filesize limit gracefully */ 436 sa.sa_handler = SIG_IGN; 437 (void)sigaction(SIGXFSZ, &sa, NULL); 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, s); 520 (void) dup2(fd, STDOUT_FILENO); 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(s, (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(s, (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(s, 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(s, 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 (void)snprintf(wtmpid, sizeof(wtmpid), "%xftpd", getpid()); 599 600 /* Try to handle urgent data inline */ 601#ifdef SO_OOBINLINE 602 if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 603 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 604#endif 605 606#ifdef F_SETOWN 607 if (fcntl(s, F_SETOWN, getpid()) == -1) 608 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 609#endif 610 dolog((struct sockaddr *)&his_addr); 611 /* 612 * Set up default state 613 */ 614 data = -1; 615 type = TYPE_A; 616 form = FORM_N; 617 stru = STRU_F; 618 mode = MODE_S; 619 tmpline[0] = '\0'; 620 621 /* If logins are disabled, print out the message. */ 622 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 623 while (fgets(line, sizeof(line), fd) != NULL) { 624 if ((cp = strchr(line, '\n')) != NULL) 625 *cp = '\0'; 626 lreply(530, "%s", line); 627 } 628 (void) fflush(stdout); 629 (void) fclose(fd); 630 reply(530, "System not available."); 631 exit(0); 632 } 633#ifdef VIRTUAL_HOSTING 634 fd = fopen(thishost->welcome, "r"); 635#else 636 fd = fopen(_PATH_FTPWELCOME, "r"); 637#endif 638 if (fd != NULL) { 639 while (fgets(line, sizeof(line), fd) != NULL) { 640 if ((cp = strchr(line, '\n')) != NULL) 641 *cp = '\0'; 642 lreply(220, "%s", line); 643 } 644 (void) fflush(stdout); 645 (void) fclose(fd); 646 /* reply(220,) must follow */ 647 } 648#ifndef VIRTUAL_HOSTING 649 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 650 fatalerror("Ran out of memory."); 651 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 652 hostname[0] = '\0'; 653 hostname[MAXHOSTNAMELEN - 1] = '\0'; 654#endif 655 if (hostinfo) 656 reply(220, "%s FTP server (%s) ready.", hostname, version); 657 else 658 reply(220, "FTP server ready."); 659 BLACKLIST_INIT(); 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; 975 976 if ((p = getpwnam(name)) == NULL) 977 return (p); 978 if (save.pw_name) { 979 free(save.pw_name); 980 free(save.pw_passwd); 981 free(save.pw_class); 982 free(save.pw_gecos); 983 free(save.pw_dir); 984 free(save.pw_shell); 985 } 986 save = *p; 987 save.pw_name = sgetsave(p->pw_name); 988 save.pw_passwd = sgetsave(p->pw_passwd); 989 save.pw_class = sgetsave(p->pw_class); 990 save.pw_gecos = sgetsave(p->pw_gecos); 991 save.pw_dir = sgetsave(p->pw_dir); 992 save.pw_shell = sgetsave(p->pw_shell); 993 return (&save); 994} 995 996static int login_attempts; /* number of failed login attempts */ 997static int askpasswd; /* had user command, ask for passwd */ 998static char curname[MAXLOGNAME]; /* current USER name */ 999 1000/* 1001 * USER command. 1002 * Sets global passwd pointer pw if named account exists and is acceptable; 1003 * sets askpasswd if a PASS command is expected. If logged in previously, 1004 * need to reset state. If name is "ftp" or "anonymous", the name is not in 1005 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 1006 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 1007 * requesting login privileges. Disallow anyone who does not have a standard 1008 * shell as returned by getusershell(). Disallow anyone mentioned in the file 1009 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 1010 */ 1011void 1012user(char *name) 1013{ 1014 int ecode; 1015 char *cp, *shell; 1016 1017 if (logged_in) { 1018 if (guest) { 1019 reply(530, "Can't change user from guest login."); 1020 return; 1021 } else if (dochroot) { 1022 reply(530, "Can't change user from chroot user."); 1023 return; 1024 } 1025 end_login(); 1026 } 1027 1028 guest = 0; 1029#ifdef VIRTUAL_HOSTING 1030 pw = sgetpwnam(thishost->anonuser); 1031#else 1032 pw = sgetpwnam("ftp"); 1033#endif 1034 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1035 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL, &ecode) || 1036 (ecode != 0 && ecode != ENOENT)) 1037 reply(530, "User %s access denied.", name); 1038 else if (checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL, &ecode) || 1039 (ecode != 0 && ecode != ENOENT)) 1040 reply(530, "User %s access denied.", name); 1041 else if (pw != NULL) { 1042 guest = 1; 1043 askpasswd = 1; 1044 reply(331, 1045 "Guest login ok, send your email address as password."); 1046 } else 1047 reply(530, "User %s unknown.", name); 1048 if (!askpasswd && logging) 1049 syslog(LOG_NOTICE, 1050 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1051 return; 1052 } 1053 if (anon_only != 0) { 1054 reply(530, "Sorry, only anonymous ftp allowed."); 1055 return; 1056 } 1057 1058 if ((pw = sgetpwnam(name))) { 1059 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1060 shell = _PATH_BSHELL; 1061 setusershell(); 1062 while ((cp = getusershell()) != NULL) 1063 if (strcmp(cp, shell) == 0) 1064 break; 1065 endusershell(); 1066 1067 if (cp == NULL || 1068 (checkuser(_PATH_FTPUSERS, name, 1, NULL, &ecode) || 1069 (ecode != 0 && ecode != ENOENT))) { 1070 reply(530, "User %s access denied.", name); 1071 if (logging) 1072 syslog(LOG_NOTICE, 1073 "FTP LOGIN REFUSED FROM %s, %s", 1074 remotehost, name); 1075 pw = NULL; 1076 return; 1077 } 1078 } 1079 if (logging) 1080 strlcpy(curname, name, sizeof(curname)); 1081 1082 pwok = 0; 1083#ifdef USE_PAM 1084 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1085#endif 1086 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1087 pwok = (pw != NULL) && 1088 opieaccessfile(remotehost) && 1089 opiealways(pw->pw_dir); 1090 reply(331, "Response to %s %s for %s.", 1091 opieprompt, pwok ? "requested" : "required", name); 1092 } else { 1093 pwok = 1; 1094 reply(331, "Password required for %s.", name); 1095 } 1096 askpasswd = 1; 1097 /* 1098 * Delay before reading passwd after first failed 1099 * attempt to slow down passwd-guessing programs. 1100 */ 1101 if (login_attempts) 1102 sleep(login_attempts); 1103} 1104 1105/* 1106 * Check if a user is in the file "fname", 1107 * return a pointer to a malloc'd string with the rest 1108 * of the matching line in "residue" if not NULL. 1109 */ 1110static int 1111checkuser(char *fname, char *name, int pwset, char **residue, int *ecode) 1112{ 1113 FILE *fd; 1114 int found = 0; 1115 size_t len; 1116 char *line, *mp, *p; 1117 1118 if (ecode != NULL) 1119 *ecode = 0; 1120 if ((fd = fopen(fname, "r")) != NULL) { 1121 while (!found && (line = fgetln(fd, &len)) != NULL) { 1122 /* skip comments */ 1123 if (line[0] == '#') 1124 continue; 1125 if (line[len - 1] == '\n') { 1126 line[len - 1] = '\0'; 1127 mp = NULL; 1128 } else { 1129 if ((mp = malloc(len + 1)) == NULL) 1130 fatalerror("Ran out of memory."); 1131 memcpy(mp, line, len); 1132 mp[len] = '\0'; 1133 line = mp; 1134 } 1135 /* avoid possible leading and trailing whitespace */ 1136 p = strtok(line, " \t"); 1137 /* skip empty lines */ 1138 if (p == NULL) 1139 goto nextline; 1140 /* 1141 * if first chr is '@', check group membership 1142 */ 1143 if (p[0] == '@') { 1144 int i = 0; 1145 struct group *grp; 1146 1147 if (p[1] == '\0') /* single @ matches anyone */ 1148 found = 1; 1149 else { 1150 if ((grp = getgrnam(p+1)) == NULL) 1151 goto nextline; 1152 /* 1153 * Check user's default group 1154 */ 1155 if (pwset && grp->gr_gid == pw->pw_gid) 1156 found = 1; 1157 /* 1158 * Check supplementary groups 1159 */ 1160 while (!found && grp->gr_mem[i]) 1161 found = strcmp(name, 1162 grp->gr_mem[i++]) 1163 == 0; 1164 } 1165 } 1166 /* 1167 * Otherwise, just check for username match 1168 */ 1169 else 1170 found = strcmp(p, name) == 0; 1171 /* 1172 * Save the rest of line to "residue" if matched 1173 */ 1174 if (found && residue) { 1175 if ((p = strtok(NULL, "")) != NULL) 1176 p += strspn(p, " \t"); 1177 if (p && *p) { 1178 if ((*residue = strdup(p)) == NULL) 1179 fatalerror("Ran out of memory."); 1180 } else 1181 *residue = NULL; 1182 } 1183nextline: 1184 if (mp) 1185 free(mp); 1186 } 1187 (void) fclose(fd); 1188 } else if (ecode != NULL) 1189 *ecode = errno; 1190 return (found); 1191} 1192 1193/* 1194 * Terminate login as previous user, if any, resetting state; 1195 * used when USER command is given or login fails. 1196 */ 1197static void 1198end_login(void) 1199{ 1200#ifdef USE_PAM 1201 int e; 1202#endif 1203 1204 (void) seteuid(0); 1205#ifdef LOGIN_CAP 1206 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 1207 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 1208 LOGIN_SETENV)); 1209#endif 1210 if (logged_in && dowtmp) 1211 ftpd_logwtmp(wtmpid, NULL, NULL); 1212 pw = NULL; 1213#ifdef USE_PAM 1214 if (pamh) { 1215 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1216 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1217 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1218 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1219 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1220 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1221 pamh = NULL; 1222 } 1223#endif 1224 logged_in = 0; 1225 guest = 0; 1226 dochroot = 0; 1227} 1228 1229#ifdef USE_PAM 1230 1231/* 1232 * the following code is stolen from imap-uw PAM authentication module and 1233 * login.c 1234 */ 1235#define COPY_STRING(s) (s ? strdup(s) : NULL) 1236 1237struct cred_t { 1238 const char *uname; /* user name */ 1239 const char *pass; /* password */ 1240}; 1241typedef struct cred_t cred_t; 1242 1243static int 1244auth_conv(int num_msg, const struct pam_message **msg, 1245 struct pam_response **resp, void *appdata) 1246{ 1247 int i; 1248 cred_t *cred = (cred_t *) appdata; 1249 struct pam_response *reply; 1250 1251 reply = calloc(num_msg, sizeof *reply); 1252 if (reply == NULL) 1253 return PAM_BUF_ERR; 1254 1255 for (i = 0; i < num_msg; i++) { 1256 switch (msg[i]->msg_style) { 1257 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1258 reply[i].resp_retcode = PAM_SUCCESS; 1259 reply[i].resp = COPY_STRING(cred->uname); 1260 /* PAM frees resp. */ 1261 break; 1262 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1263 reply[i].resp_retcode = PAM_SUCCESS; 1264 reply[i].resp = COPY_STRING(cred->pass); 1265 /* PAM frees resp. */ 1266 break; 1267 case PAM_TEXT_INFO: 1268 case PAM_ERROR_MSG: 1269 reply[i].resp_retcode = PAM_SUCCESS; 1270 reply[i].resp = NULL; 1271 break; 1272 default: /* unknown message style */ 1273 free(reply); 1274 return PAM_CONV_ERR; 1275 } 1276 } 1277 1278 *resp = reply; 1279 return PAM_SUCCESS; 1280} 1281 1282/* 1283 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1284 * authenticated, or 1 if not authenticated. If some sort of PAM system 1285 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1286 * function returns -1. This can be used as an indication that we should 1287 * fall back to a different authentication mechanism. 1288 */ 1289static int 1290auth_pam(struct passwd **ppw, const char *pass) 1291{ 1292 const char *tmpl_user; 1293 const void *item; 1294 int rval; 1295 int e; 1296 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1297 struct pam_conv conv = { &auth_conv, &auth_cred }; 1298 1299 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1300 if (e != PAM_SUCCESS) { 1301 /* 1302 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1303 * if context creation has failed in the first place. 1304 */ 1305 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1306 return -1; 1307 } 1308 1309 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1310 if (e != PAM_SUCCESS) { 1311 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1312 pam_strerror(pamh, e)); 1313 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1314 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1315 } 1316 pamh = NULL; 1317 return -1; 1318 } 1319 1320 e = pam_authenticate(pamh, 0); 1321 switch (e) { 1322 case PAM_SUCCESS: 1323 /* 1324 * With PAM we support the concept of a "template" 1325 * user. The user enters a login name which is 1326 * authenticated by PAM, usually via a remote service 1327 * such as RADIUS or TACACS+. If authentication 1328 * succeeds, a different but related "template" name 1329 * is used for setting the credentials, shell, and 1330 * home directory. The name the user enters need only 1331 * exist on the remote authentication server, but the 1332 * template name must be present in the local password 1333 * database. 1334 * 1335 * This is supported by two various mechanisms in the 1336 * individual modules. However, from the application's 1337 * point of view, the template user is always passed 1338 * back as a changed value of the PAM_USER item. 1339 */ 1340 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1341 PAM_SUCCESS) { 1342 tmpl_user = (const char *) item; 1343 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1344 *ppw = getpwnam(tmpl_user); 1345 } else 1346 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1347 pam_strerror(pamh, e)); 1348 rval = 0; 1349 break; 1350 1351 case PAM_AUTH_ERR: 1352 case PAM_USER_UNKNOWN: 1353 case PAM_MAXTRIES: 1354 rval = 1; 1355 break; 1356 1357 default: 1358 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1359 rval = -1; 1360 break; 1361 } 1362 1363 if (rval == 0) { 1364 e = pam_acct_mgmt(pamh, 0); 1365 if (e != PAM_SUCCESS) { 1366 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1367 pam_strerror(pamh, e)); 1368 rval = 1; 1369 } 1370 } 1371 1372 if (rval != 0) { 1373 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1374 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1375 } 1376 pamh = NULL; 1377 } 1378 return rval; 1379} 1380 1381#endif /* USE_PAM */ 1382 1383void 1384pass(char *passwd) 1385{ 1386 int rval, ecode; 1387 FILE *fd; 1388#ifdef LOGIN_CAP 1389 login_cap_t *lc = NULL; 1390#endif 1391#ifdef USE_PAM 1392 int e; 1393#endif 1394 char *residue = NULL; 1395 char *xpasswd; 1396 1397 if (logged_in || askpasswd == 0) { 1398 reply(503, "Login with USER first."); 1399 return; 1400 } 1401 askpasswd = 0; 1402 if (!guest) { /* "ftp" is only account allowed no password */ 1403 if (pw == NULL) { 1404 rval = 1; /* failure below */ 1405 goto skip; 1406 } 1407#ifdef USE_PAM 1408 rval = auth_pam(&pw, passwd); 1409 if (rval >= 0) { 1410 opieunlock(); 1411 goto skip; 1412 } 1413#endif 1414 if (opieverify(&opiedata, passwd) == 0) 1415 xpasswd = pw->pw_passwd; 1416 else if (pwok) { 1417 xpasswd = crypt(passwd, pw->pw_passwd); 1418 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1419 xpasswd = ":"; 1420 } else { 1421 rval = 1; 1422 goto skip; 1423 } 1424 rval = strcmp(pw->pw_passwd, xpasswd); 1425 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1426 rval = 1; /* failure */ 1427skip: 1428 /* 1429 * If rval == 1, the user failed the authentication check 1430 * above. If rval == 0, either PAM or local authentication 1431 * succeeded. 1432 */ 1433 if (rval) { 1434 reply(530, "Login incorrect."); 1435 BLACKLIST_NOTIFY(BLACKLIST_AUTH_FAIL, STDIN_FILENO, "Login incorrect"); 1436 if (logging) { 1437 syslog(LOG_NOTICE, 1438 "FTP LOGIN FAILED FROM %s", 1439 remotehost); 1440 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1441 "FTP LOGIN FAILED FROM %s, %s", 1442 remotehost, curname); 1443 } 1444 pw = NULL; 1445 if (login_attempts++ >= 5) { 1446 syslog(LOG_NOTICE, 1447 "repeated login failures from %s", 1448 remotehost); 1449 exit(0); 1450 } 1451 return; 1452 } else { 1453 BLACKLIST_NOTIFY(BLACKLIST_AUTH_OK, STDIN_FILENO, "Login successful"); 1454 } 1455 } 1456 login_attempts = 0; /* this time successful */ 1457 if (setegid(pw->pw_gid) < 0) { 1458 reply(550, "Can't set gid."); 1459 return; 1460 } 1461 /* May be overridden by login.conf */ 1462 (void) umask(defumask); 1463#ifdef LOGIN_CAP 1464 if ((lc = login_getpwclass(pw)) != NULL) { 1465 char remote_ip[NI_MAXHOST]; 1466 1467 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1468 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1469 NI_NUMERICHOST)) 1470 *remote_ip = 0; 1471 remote_ip[sizeof(remote_ip) - 1] = 0; 1472 if (!auth_hostok(lc, remotehost, remote_ip)) { 1473 syslog(LOG_INFO|LOG_AUTH, 1474 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1475 pw->pw_name); 1476 reply(530, "Permission denied."); 1477 pw = NULL; 1478 return; 1479 } 1480 if (!auth_timeok(lc, time(NULL))) { 1481 reply(530, "Login not available right now."); 1482 pw = NULL; 1483 return; 1484 } 1485 } 1486 setusercontext(lc, pw, 0, LOGIN_SETALL & 1487 ~(LOGIN_SETRESOURCES | LOGIN_SETUSER | LOGIN_SETPATH | LOGIN_SETENV)); 1488#else 1489 setlogin(pw->pw_name); 1490 (void) initgroups(pw->pw_name, pw->pw_gid); 1491#endif 1492 1493#ifdef USE_PAM 1494 if (pamh) { 1495 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1496 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1497 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1498 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1499 } 1500 } 1501#endif 1502 1503 dochroot = 1504 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue, &ecode) 1505#ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1506 || login_getcapbool(lc, "ftp-chroot", 0) 1507#endif 1508 ; 1509 /* 1510 * It is possible that checkuser() failed to open the chroot file. 1511 * If this is the case, report that logins are un-available, since we 1512 * have no way of checking whether or not the user should be chrooted. 1513 * We ignore ENOENT since it is not required that this file be present. 1514 */ 1515 if (ecode != 0 && ecode != ENOENT) { 1516 reply(530, "Login not available right now."); 1517 return; 1518 } 1519 chrootdir = NULL; 1520 1521 /* Disable wtmp logging when chrooting. */ 1522 if (dochroot || guest) 1523 dowtmp = 0; 1524 if (dowtmp) 1525 ftpd_logwtmp(wtmpid, pw->pw_name, 1526 (struct sockaddr *)&his_addr); 1527 logged_in = 1; 1528 1529#ifdef LOGIN_CAP 1530 setusercontext(lc, pw, 0, LOGIN_SETRESOURCES); 1531#endif 1532 1533 if (guest && stats && statfd < 0) { 1534#ifdef VIRTUAL_HOSTING 1535 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1536#else 1537 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1538#endif 1539 if (statfd < 0) 1540 stats = 0; 1541 } 1542 1543 /* 1544 * For a chrooted local user, 1545 * a) see whether ftpchroot(5) specifies a chroot directory, 1546 * b) extract the directory pathname from the line, 1547 * c) expand it to the absolute pathname if necessary. 1548 */ 1549 if (dochroot && residue && 1550 (chrootdir = strtok(residue, " \t")) != NULL) { 1551 if (chrootdir[0] != '/') 1552 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1553 else 1554 chrootdir = strdup(chrootdir); /* make it permanent */ 1555 if (chrootdir == NULL) 1556 fatalerror("Ran out of memory."); 1557 } 1558 if (guest || dochroot) { 1559 /* 1560 * If no chroot directory set yet, use the login directory. 1561 * Copy it so it can be modified while pw->pw_dir stays intact. 1562 */ 1563 if (chrootdir == NULL && 1564 (chrootdir = strdup(pw->pw_dir)) == NULL) 1565 fatalerror("Ran out of memory."); 1566 /* 1567 * Check for the "/chroot/./home" syntax, 1568 * separate the chroot and home directory pathnames. 1569 */ 1570 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1571 *(homedir++) = '\0'; /* wipe '/' */ 1572 homedir++; /* skip '.' */ 1573 } else { 1574 /* 1575 * We MUST do a chdir() after the chroot. Otherwise 1576 * the old current directory will be accessible as "." 1577 * outside the new root! 1578 */ 1579 homedir = "/"; 1580 } 1581 /* 1582 * Finally, do chroot() 1583 */ 1584 if (chroot(chrootdir) < 0) { 1585 reply(550, "Can't change root."); 1586 goto bad; 1587 } 1588 __FreeBSD_libc_enter_restricted_mode(); 1589 } else /* real user w/o chroot */ 1590 homedir = pw->pw_dir; 1591 /* 1592 * Set euid *before* doing chdir() so 1593 * a) the user won't be carried to a directory that he couldn't reach 1594 * on his own due to no permission to upper path components, 1595 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1596 * (uid 0 has no root power over NFS if not mapped explicitly.) 1597 */ 1598 if (seteuid(pw->pw_uid) < 0) { 1599 if (guest || dochroot) { 1600 fatalerror("Can't set uid."); 1601 } else { 1602 reply(550, "Can't set uid."); 1603 goto bad; 1604 } 1605 } 1606 /* 1607 * Do not allow the session to live if we're chroot()'ed and chdir() 1608 * fails. Otherwise the chroot jail can be escaped. 1609 */ 1610 if (chdir(homedir) < 0) { 1611 if (guest || dochroot) { 1612 fatalerror("Can't change to base directory."); 1613 } else { 1614 if (chdir("/") < 0) { 1615 reply(550, "Root is inaccessible."); 1616 goto bad; 1617 } 1618 lreply(230, "No directory! Logging in with home=/."); 1619 } 1620 } 1621 1622 /* 1623 * Display a login message, if it exists. 1624 * N.B. reply(230,) must follow the message. 1625 */ 1626#ifdef VIRTUAL_HOSTING 1627 fd = fopen(thishost->loginmsg, "r"); 1628#else 1629 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1630#endif 1631 if (fd != NULL) { 1632 char *cp, line[LINE_MAX]; 1633 1634 while (fgets(line, sizeof(line), fd) != NULL) { 1635 if ((cp = strchr(line, '\n')) != NULL) 1636 *cp = '\0'; 1637 lreply(230, "%s", line); 1638 } 1639 (void) fflush(stdout); 1640 (void) fclose(fd); 1641 } 1642 if (guest) { 1643 if (ident != NULL) 1644 free(ident); 1645 ident = strdup(passwd); 1646 if (ident == NULL) 1647 fatalerror("Ran out of memory."); 1648 1649 reply(230, "Guest login ok, access restrictions apply."); 1650#ifdef SETPROCTITLE 1651#ifdef VIRTUAL_HOSTING 1652 if (thishost != firsthost) 1653 snprintf(proctitle, sizeof(proctitle), 1654 "%s: anonymous(%s)/%s", remotehost, hostname, 1655 passwd); 1656 else 1657#endif 1658 snprintf(proctitle, sizeof(proctitle), 1659 "%s: anonymous/%s", remotehost, passwd); 1660 setproctitle("%s", proctitle); 1661#endif /* SETPROCTITLE */ 1662 if (logging) 1663 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1664 remotehost, passwd); 1665 } else { 1666 if (dochroot) 1667 reply(230, "User %s logged in, " 1668 "access restrictions apply.", pw->pw_name); 1669 else 1670 reply(230, "User %s logged in.", pw->pw_name); 1671 1672#ifdef SETPROCTITLE 1673 snprintf(proctitle, sizeof(proctitle), 1674 "%s: user/%s", remotehost, pw->pw_name); 1675 setproctitle("%s", proctitle); 1676#endif /* SETPROCTITLE */ 1677 if (logging) 1678 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1679 remotehost, pw->pw_name); 1680 } 1681 if (logging && (guest || dochroot)) 1682 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1683#ifdef LOGIN_CAP 1684 login_close(lc); 1685#endif 1686 if (residue) 1687 free(residue); 1688 return; 1689bad: 1690 /* Forget all about it... */ 1691#ifdef LOGIN_CAP 1692 login_close(lc); 1693#endif 1694 if (residue) 1695 free(residue); 1696 end_login(); 1697} 1698 1699void 1700retrieve(char *cmd, char *name) 1701{ 1702 FILE *fin, *dout; 1703 struct stat st; 1704 int (*closefunc)(FILE *); 1705 time_t start; 1706 char line[BUFSIZ]; 1707 1708 if (cmd == 0) { 1709 fin = fopen(name, "r"), closefunc = fclose; 1710 st.st_size = 0; 1711 } else { 1712 (void) snprintf(line, sizeof(line), cmd, name); 1713 name = line; 1714 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1715 st.st_size = -1; 1716 st.st_blksize = BUFSIZ; 1717 } 1718 if (fin == NULL) { 1719 if (errno != 0) { 1720 perror_reply(550, name); 1721 if (cmd == 0) { 1722 LOGCMD("get", name); 1723 } 1724 } 1725 return; 1726 } 1727 byte_count = -1; 1728 if (cmd == 0) { 1729 if (fstat(fileno(fin), &st) < 0) { 1730 perror_reply(550, name); 1731 goto done; 1732 } 1733 if (!S_ISREG(st.st_mode)) { 1734 /* 1735 * Never sending a raw directory is a workaround 1736 * for buggy clients that will attempt to RETR 1737 * a directory before listing it, e.g., Mozilla. 1738 * Preventing a guest from getting irregular files 1739 * is a simple security measure. 1740 */ 1741 if (S_ISDIR(st.st_mode) || guest) { 1742 reply(550, "%s: not a plain file.", name); 1743 goto done; 1744 } 1745 st.st_size = -1; 1746 /* st.st_blksize is set for all descriptor types */ 1747 } 1748 } 1749 if (restart_point) { 1750 if (type == TYPE_A) { 1751 off_t i, n; 1752 int c; 1753 1754 n = restart_point; 1755 i = 0; 1756 while (i++ < n) { 1757 if ((c=getc(fin)) == EOF) { 1758 perror_reply(550, name); 1759 goto done; 1760 } 1761 if (c == '\n') 1762 i++; 1763 } 1764 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1765 perror_reply(550, name); 1766 goto done; 1767 } 1768 } 1769 dout = dataconn(name, st.st_size, "w"); 1770 if (dout == NULL) 1771 goto done; 1772 time(&start); 1773 send_data(fin, dout, st.st_blksize, st.st_size, 1774 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1775 if (cmd == 0 && guest && stats && byte_count > 0) 1776 logxfer(name, byte_count, start); 1777 (void) fclose(dout); 1778 data = -1; 1779 pdata = -1; 1780done: 1781 if (cmd == 0) 1782 LOGBYTES("get", name, byte_count); 1783 (*closefunc)(fin); 1784} 1785 1786void 1787store(char *name, char *mode, int unique) 1788{ 1789 int fd; 1790 FILE *fout, *din; 1791 int (*closefunc)(FILE *); 1792 1793 if (*mode == 'a') { /* APPE */ 1794 if (unique) { 1795 /* Programming error */ 1796 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1797 unique = 0; 1798 } 1799 if (guest && noguestmod) { 1800 reply(550, "Appending to existing file denied."); 1801 goto err; 1802 } 1803 restart_point = 0; /* not affected by preceding REST */ 1804 } 1805 if (unique) /* STOU overrides REST */ 1806 restart_point = 0; 1807 if (guest && noguestmod) { 1808 if (restart_point) { /* guest STOR w/REST */ 1809 reply(550, "Modifying existing file denied."); 1810 goto err; 1811 } else /* treat guest STOR as STOU */ 1812 unique = 1; 1813 } 1814 1815 if (restart_point) 1816 mode = "r+"; /* so ASCII manual seek can work */ 1817 if (unique) { 1818 if ((fd = guniquefd(name, &name)) < 0) 1819 goto err; 1820 fout = fdopen(fd, mode); 1821 } else 1822 fout = fopen(name, mode); 1823 closefunc = fclose; 1824 if (fout == NULL) { 1825 perror_reply(553, name); 1826 goto err; 1827 } 1828 byte_count = -1; 1829 if (restart_point) { 1830 if (type == TYPE_A) { 1831 off_t i, n; 1832 int c; 1833 1834 n = restart_point; 1835 i = 0; 1836 while (i++ < n) { 1837 if ((c=getc(fout)) == EOF) { 1838 perror_reply(550, name); 1839 goto done; 1840 } 1841 if (c == '\n') 1842 i++; 1843 } 1844 /* 1845 * We must do this seek to "current" position 1846 * because we are changing from reading to 1847 * writing. 1848 */ 1849 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1850 perror_reply(550, name); 1851 goto done; 1852 } 1853 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1854 perror_reply(550, name); 1855 goto done; 1856 } 1857 } 1858 din = dataconn(name, -1, "r"); 1859 if (din == NULL) 1860 goto done; 1861 if (receive_data(din, fout) == 0) { 1862 if (unique) 1863 reply(226, "Transfer complete (unique file name:%s).", 1864 name); 1865 else 1866 reply(226, "Transfer complete."); 1867 } 1868 (void) fclose(din); 1869 data = -1; 1870 pdata = -1; 1871done: 1872 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1873 (*closefunc)(fout); 1874 return; 1875err: 1876 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1877 return; 1878} 1879 1880static FILE * 1881getdatasock(char *mode) 1882{ 1883 int on = 1, s, t, tries; 1884 1885 if (data >= 0) 1886 return (fdopen(data, mode)); 1887 1888 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1889 if (s < 0) 1890 goto bad; 1891 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1892 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1893 /* anchor socket to avoid multi-homing problems */ 1894 data_source = ctrl_addr; 1895 data_source.su_port = htons(dataport); 1896 (void) seteuid(0); 1897 for (tries = 1; ; tries++) { 1898 /* 1899 * We should loop here since it's possible that 1900 * another ftpd instance has passed this point and is 1901 * trying to open a data connection in active mode now. 1902 * Until the other connection is opened, we'll be getting 1903 * EADDRINUSE because no SOCK_STREAM sockets in the system 1904 * can share both local and remote addresses, localIP:20 1905 * and *:* in this case. 1906 */ 1907 if (bind(s, (struct sockaddr *)&data_source, 1908 data_source.su_len) >= 0) 1909 break; 1910 if (errno != EADDRINUSE || tries > 10) 1911 goto bad; 1912 sleep(tries); 1913 } 1914 (void) seteuid(pw->pw_uid); 1915#ifdef IP_TOS 1916 if (data_source.su_family == AF_INET) 1917 { 1918 on = IPTOS_THROUGHPUT; 1919 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1920 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1921 } 1922#endif 1923#ifdef TCP_NOPUSH 1924 /* 1925 * Turn off push flag to keep sender TCP from sending short packets 1926 * at the boundaries of each write(). 1927 */ 1928 on = 1; 1929 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1930 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1931#endif 1932 return (fdopen(s, mode)); 1933bad: 1934 /* Return the real value of errno (close may change it) */ 1935 t = errno; 1936 (void) seteuid(pw->pw_uid); 1937 (void) close(s); 1938 errno = t; 1939 return (NULL); 1940} 1941 1942static FILE * 1943dataconn(char *name, off_t size, char *mode) 1944{ 1945 char sizebuf[32]; 1946 FILE *file; 1947 int retry = 0, tos, conerrno; 1948 1949 file_size = size; 1950 byte_count = 0; 1951 if (size != -1) 1952 (void) snprintf(sizebuf, sizeof(sizebuf), 1953 " (%jd bytes)", (intmax_t)size); 1954 else 1955 *sizebuf = '\0'; 1956 if (pdata >= 0) { 1957 union sockunion from; 1958 socklen_t fromlen = ctrl_addr.su_len; 1959 int flags, s; 1960 struct timeval timeout; 1961 fd_set set; 1962 1963 FD_ZERO(&set); 1964 FD_SET(pdata, &set); 1965 1966 timeout.tv_usec = 0; 1967 timeout.tv_sec = 120; 1968 1969 /* 1970 * Granted a socket is in the blocking I/O mode, 1971 * accept() will block after a successful select() 1972 * if the selected connection dies in between. 1973 * Therefore set the non-blocking I/O flag here. 1974 */ 1975 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1976 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1977 goto pdata_err; 1978 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1979 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1980 goto pdata_err; 1981 (void) close(pdata); 1982 pdata = s; 1983 /* 1984 * Unset the inherited non-blocking I/O flag 1985 * on the child socket so stdio can work on it. 1986 */ 1987 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1988 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1989 goto pdata_err; 1990#ifdef IP_TOS 1991 if (from.su_family == AF_INET) 1992 { 1993 tos = IPTOS_THROUGHPUT; 1994 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1995 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1996 } 1997#endif 1998 reply(150, "Opening %s mode data connection for '%s'%s.", 1999 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2000 return (fdopen(pdata, mode)); 2001pdata_err: 2002 reply(425, "Can't open data connection."); 2003 (void) close(pdata); 2004 pdata = -1; 2005 return (NULL); 2006 } 2007 if (data >= 0) { 2008 reply(125, "Using existing data connection for '%s'%s.", 2009 name, sizebuf); 2010 usedefault = 1; 2011 return (fdopen(data, mode)); 2012 } 2013 if (usedefault) 2014 data_dest = his_addr; 2015 usedefault = 1; 2016 do { 2017 file = getdatasock(mode); 2018 if (file == NULL) { 2019 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 2020 2021 if (getnameinfo((struct sockaddr *)&data_source, 2022 data_source.su_len, 2023 hostbuf, sizeof(hostbuf) - 1, 2024 portbuf, sizeof(portbuf) - 1, 2025 NI_NUMERICHOST|NI_NUMERICSERV)) 2026 *hostbuf = *portbuf = 0; 2027 hostbuf[sizeof(hostbuf) - 1] = 0; 2028 portbuf[sizeof(portbuf) - 1] = 0; 2029 reply(425, "Can't create data socket (%s,%s): %s.", 2030 hostbuf, portbuf, strerror(errno)); 2031 return (NULL); 2032 } 2033 data = fileno(file); 2034 conerrno = 0; 2035 if (connect(data, (struct sockaddr *)&data_dest, 2036 data_dest.su_len) == 0) 2037 break; 2038 conerrno = errno; 2039 (void) fclose(file); 2040 data = -1; 2041 if (conerrno == EADDRINUSE) { 2042 sleep(swaitint); 2043 retry += swaitint; 2044 } else { 2045 break; 2046 } 2047 } while (retry <= swaitmax); 2048 if (conerrno != 0) { 2049 reply(425, "Can't build data connection: %s.", 2050 strerror(conerrno)); 2051 return (NULL); 2052 } 2053 reply(150, "Opening %s mode data connection for '%s'%s.", 2054 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2055 return (file); 2056} 2057 2058/* 2059 * A helper macro to avoid code duplication 2060 * in send_data() and receive_data(). 2061 * 2062 * XXX We have to block SIGURG during putc() because BSD stdio 2063 * is unable to restart interrupted write operations and hence 2064 * the entire buffer contents will be lost as soon as a write() 2065 * call indicates EINTR to stdio. 2066 */ 2067#define FTPD_PUTC(ch, file, label) \ 2068 do { \ 2069 int ret; \ 2070 \ 2071 do { \ 2072 START_UNSAFE; \ 2073 ret = putc((ch), (file)); \ 2074 END_UNSAFE; \ 2075 CHECKOOB(return (-1)) \ 2076 else if (ferror(file)) \ 2077 goto label; \ 2078 clearerr(file); \ 2079 } while (ret == EOF); \ 2080 } while (0) 2081 2082/* 2083 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2084 * encapsulation of the data subject to Mode, Structure, and Type. 2085 * 2086 * NB: Form isn't handled. 2087 */ 2088static int 2089send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2090{ 2091 int c, cp, filefd, netfd; 2092 char *buf; 2093 2094 STARTXFER; 2095 2096 switch (type) { 2097 2098 case TYPE_A: 2099 cp = EOF; 2100 for (;;) { 2101 c = getc(instr); 2102 CHECKOOB(return (-1)) 2103 else if (c == EOF && ferror(instr)) 2104 goto file_err; 2105 if (c == EOF) { 2106 if (ferror(instr)) { /* resume after OOB */ 2107 clearerr(instr); 2108 continue; 2109 } 2110 if (feof(instr)) /* EOF */ 2111 break; 2112 syslog(LOG_ERR, "Internal: impossible condition" 2113 " on file after getc()"); 2114 goto file_err; 2115 } 2116 if (c == '\n' && cp != '\r') { 2117 FTPD_PUTC('\r', outstr, data_err); 2118 byte_count++; 2119 } 2120 FTPD_PUTC(c, outstr, data_err); 2121 byte_count++; 2122 cp = c; 2123 } 2124#ifdef notyet /* BSD stdio isn't ready for that */ 2125 while (fflush(outstr) == EOF) { 2126 CHECKOOB(return (-1)) 2127 else 2128 goto data_err; 2129 clearerr(outstr); 2130 } 2131 ENDXFER; 2132#else 2133 ENDXFER; 2134 if (fflush(outstr) == EOF) 2135 goto data_err; 2136#endif 2137 reply(226, "Transfer complete."); 2138 return (0); 2139 2140 case TYPE_I: 2141 case TYPE_L: 2142 /* 2143 * isreg is only set if we are not doing restart and we 2144 * are sending a regular file 2145 */ 2146 netfd = fileno(outstr); 2147 filefd = fileno(instr); 2148 2149 if (isreg) { 2150 char *msg = "Transfer complete."; 2151 off_t cnt, offset; 2152 int err; 2153 2154 cnt = offset = 0; 2155 2156 while (filesize > 0) { 2157 err = sendfile(filefd, netfd, offset, 0, 2158 NULL, &cnt, 0); 2159 /* 2160 * Calculate byte_count before OOB processing. 2161 * It can be used in myoob() later. 2162 */ 2163 byte_count += cnt; 2164 offset += cnt; 2165 filesize -= cnt; 2166 CHECKOOB(return (-1)) 2167 else if (err == -1) { 2168 if (errno != EINTR && 2169 cnt == 0 && offset == 0) 2170 goto oldway; 2171 goto data_err; 2172 } 2173 if (err == -1) /* resume after OOB */ 2174 continue; 2175 /* 2176 * We hit the EOF prematurely. 2177 * Perhaps the file was externally truncated. 2178 */ 2179 if (cnt == 0) { 2180 msg = "Transfer finished due to " 2181 "premature end of file."; 2182 break; 2183 } 2184 } 2185 ENDXFER; 2186 reply(226, "%s", msg); 2187 return (0); 2188 } 2189 2190oldway: 2191 if ((buf = malloc(blksize)) == NULL) { 2192 ENDXFER; 2193 reply(451, "Ran out of memory."); 2194 return (-1); 2195 } 2196 2197 for (;;) { 2198 int cnt, len; 2199 char *bp; 2200 2201 cnt = read(filefd, buf, blksize); 2202 CHECKOOB(free(buf); return (-1)) 2203 else if (cnt < 0) { 2204 free(buf); 2205 goto file_err; 2206 } 2207 if (cnt < 0) /* resume after OOB */ 2208 continue; 2209 if (cnt == 0) /* EOF */ 2210 break; 2211 for (len = cnt, bp = buf; len > 0;) { 2212 cnt = write(netfd, bp, len); 2213 CHECKOOB(free(buf); return (-1)) 2214 else if (cnt < 0) { 2215 free(buf); 2216 goto data_err; 2217 } 2218 if (cnt <= 0) 2219 continue; 2220 len -= cnt; 2221 bp += cnt; 2222 byte_count += cnt; 2223 } 2224 } 2225 ENDXFER; 2226 free(buf); 2227 reply(226, "Transfer complete."); 2228 return (0); 2229 default: 2230 ENDXFER; 2231 reply(550, "Unimplemented TYPE %d in send_data.", type); 2232 return (-1); 2233 } 2234 2235data_err: 2236 ENDXFER; 2237 perror_reply(426, "Data connection"); 2238 return (-1); 2239 2240file_err: 2241 ENDXFER; 2242 perror_reply(551, "Error on input file"); 2243 return (-1); 2244} 2245 2246/* 2247 * Transfer data from peer to "outstr" using the appropriate encapulation of 2248 * the data subject to Mode, Structure, and Type. 2249 * 2250 * N.B.: Form isn't handled. 2251 */ 2252static int 2253receive_data(FILE *instr, FILE *outstr) 2254{ 2255 int c, cp; 2256 int bare_lfs = 0; 2257 2258 STARTXFER; 2259 2260 switch (type) { 2261 2262 case TYPE_I: 2263 case TYPE_L: 2264 for (;;) { 2265 int cnt, len; 2266 char *bp; 2267 char buf[BUFSIZ]; 2268 2269 cnt = read(fileno(instr), buf, sizeof(buf)); 2270 CHECKOOB(return (-1)) 2271 else if (cnt < 0) 2272 goto data_err; 2273 if (cnt < 0) /* resume after OOB */ 2274 continue; 2275 if (cnt == 0) /* EOF */ 2276 break; 2277 for (len = cnt, bp = buf; len > 0;) { 2278 cnt = write(fileno(outstr), bp, len); 2279 CHECKOOB(return (-1)) 2280 else if (cnt < 0) 2281 goto file_err; 2282 if (cnt <= 0) 2283 continue; 2284 len -= cnt; 2285 bp += cnt; 2286 byte_count += cnt; 2287 } 2288 } 2289 ENDXFER; 2290 return (0); 2291 2292 case TYPE_E: 2293 ENDXFER; 2294 reply(553, "TYPE E not implemented."); 2295 return (-1); 2296 2297 case TYPE_A: 2298 cp = EOF; 2299 for (;;) { 2300 c = getc(instr); 2301 CHECKOOB(return (-1)) 2302 else if (c == EOF && ferror(instr)) 2303 goto data_err; 2304 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2305 clearerr(instr); 2306 continue; 2307 } 2308 2309 if (cp == '\r') { 2310 if (c != '\n') 2311 FTPD_PUTC('\r', outstr, file_err); 2312 } else 2313 if (c == '\n') 2314 bare_lfs++; 2315 if (c == '\r') { 2316 byte_count++; 2317 cp = c; 2318 continue; 2319 } 2320 2321 /* Check for EOF here in order not to lose last \r. */ 2322 if (c == EOF) { 2323 if (feof(instr)) /* EOF */ 2324 break; 2325 syslog(LOG_ERR, "Internal: impossible condition" 2326 " on data stream after getc()"); 2327 goto data_err; 2328 } 2329 2330 byte_count++; 2331 FTPD_PUTC(c, outstr, file_err); 2332 cp = c; 2333 } 2334#ifdef notyet /* BSD stdio isn't ready for that */ 2335 while (fflush(outstr) == EOF) { 2336 CHECKOOB(return (-1)) 2337 else 2338 goto file_err; 2339 clearerr(outstr); 2340 } 2341 ENDXFER; 2342#else 2343 ENDXFER; 2344 if (fflush(outstr) == EOF) 2345 goto file_err; 2346#endif 2347 if (bare_lfs) { 2348 lreply(226, 2349 "WARNING! %d bare linefeeds received in ASCII mode.", 2350 bare_lfs); 2351 (void)printf(" File may not have transferred correctly.\r\n"); 2352 } 2353 return (0); 2354 default: 2355 ENDXFER; 2356 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2357 return (-1); 2358 } 2359 2360data_err: 2361 ENDXFER; 2362 perror_reply(426, "Data connection"); 2363 return (-1); 2364 2365file_err: 2366 ENDXFER; 2367 perror_reply(452, "Error writing to file"); 2368 return (-1); 2369} 2370 2371void 2372statfilecmd(char *filename) 2373{ 2374 FILE *fin; 2375 int atstart; 2376 int c, code; 2377 char line[LINE_MAX]; 2378 struct stat st; 2379 2380 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2381 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2382 fin = ftpd_popen(line, "r"); 2383 if (fin == NULL) { 2384 perror_reply(551, filename); 2385 return; 2386 } 2387 lreply(code, "Status of %s:", filename); 2388 atstart = 1; 2389 while ((c = getc(fin)) != EOF) { 2390 if (c == '\n') { 2391 if (ferror(stdout)){ 2392 perror_reply(421, "Control connection"); 2393 (void) ftpd_pclose(fin); 2394 dologout(1); 2395 /* NOTREACHED */ 2396 } 2397 if (ferror(fin)) { 2398 perror_reply(551, filename); 2399 (void) ftpd_pclose(fin); 2400 return; 2401 } 2402 (void) putc('\r', stdout); 2403 } 2404 /* 2405 * RFC 959 says neutral text should be prepended before 2406 * a leading 3-digit number followed by whitespace, but 2407 * many ftp clients can be confused by any leading digits, 2408 * as a matter of fact. 2409 */ 2410 if (atstart && isdigit(c)) 2411 (void) putc(' ', stdout); 2412 (void) putc(c, stdout); 2413 atstart = (c == '\n'); 2414 } 2415 (void) ftpd_pclose(fin); 2416 reply(code, "End of status."); 2417} 2418 2419void 2420statcmd(void) 2421{ 2422 union sockunion *su; 2423 u_char *a, *p; 2424 char hname[NI_MAXHOST]; 2425 int ispassive; 2426 2427 if (hostinfo) { 2428 lreply(211, "%s FTP server status:", hostname); 2429 printf(" %s\r\n", version); 2430 } else 2431 lreply(211, "FTP server status:"); 2432 printf(" Connected to %s", remotehost); 2433 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2434 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2435 hname[sizeof(hname) - 1] = 0; 2436 if (strcmp(hname, remotehost) != 0) 2437 printf(" (%s)", hname); 2438 } 2439 printf("\r\n"); 2440 if (logged_in) { 2441 if (guest) 2442 printf(" Logged in anonymously\r\n"); 2443 else 2444 printf(" Logged in as %s\r\n", pw->pw_name); 2445 } else if (askpasswd) 2446 printf(" Waiting for password\r\n"); 2447 else 2448 printf(" Waiting for user name\r\n"); 2449 printf(" TYPE: %s", typenames[type]); 2450 if (type == TYPE_A || type == TYPE_E) 2451 printf(", FORM: %s", formnames[form]); 2452 if (type == TYPE_L) 2453#if CHAR_BIT == 8 2454 printf(" %d", CHAR_BIT); 2455#else 2456 printf(" %d", bytesize); /* need definition! */ 2457#endif 2458 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2459 strunames[stru], modenames[mode]); 2460 if (data != -1) 2461 printf(" Data connection open\r\n"); 2462 else if (pdata != -1) { 2463 ispassive = 1; 2464 su = &pasv_addr; 2465 goto printaddr; 2466 } else if (usedefault == 0) { 2467 ispassive = 0; 2468 su = &data_dest; 2469printaddr: 2470#define UC(b) (((int) b) & 0xff) 2471 if (epsvall) { 2472 printf(" EPSV only mode (EPSV ALL)\r\n"); 2473 goto epsvonly; 2474 } 2475 2476 /* PORT/PASV */ 2477 if (su->su_family == AF_INET) { 2478 a = (u_char *) &su->su_sin.sin_addr; 2479 p = (u_char *) &su->su_sin.sin_port; 2480 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2481 ispassive ? "PASV" : "PORT", 2482 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2483 UC(p[0]), UC(p[1])); 2484 } 2485 2486 /* LPRT/LPSV */ 2487 { 2488 int alen, af, i; 2489 2490 switch (su->su_family) { 2491 case AF_INET: 2492 a = (u_char *) &su->su_sin.sin_addr; 2493 p = (u_char *) &su->su_sin.sin_port; 2494 alen = sizeof(su->su_sin.sin_addr); 2495 af = 4; 2496 break; 2497 case AF_INET6: 2498 a = (u_char *) &su->su_sin6.sin6_addr; 2499 p = (u_char *) &su->su_sin6.sin6_port; 2500 alen = sizeof(su->su_sin6.sin6_addr); 2501 af = 6; 2502 break; 2503 default: 2504 af = 0; 2505 break; 2506 } 2507 if (af) { 2508 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2509 af, alen); 2510 for (i = 0; i < alen; i++) 2511 printf("%d,", UC(a[i])); 2512 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2513 } 2514 } 2515 2516epsvonly:; 2517 /* EPRT/EPSV */ 2518 { 2519 int af; 2520 2521 switch (su->su_family) { 2522 case AF_INET: 2523 af = 1; 2524 break; 2525 case AF_INET6: 2526 af = 2; 2527 break; 2528 default: 2529 af = 0; 2530 break; 2531 } 2532 if (af) { 2533 union sockunion tmp; 2534 2535 tmp = *su; 2536 if (tmp.su_family == AF_INET6) 2537 tmp.su_sin6.sin6_scope_id = 0; 2538 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2539 hname, sizeof(hname) - 1, NULL, 0, 2540 NI_NUMERICHOST)) { 2541 hname[sizeof(hname) - 1] = 0; 2542 printf(" %s |%d|%s|%d|\r\n", 2543 ispassive ? "EPSV" : "EPRT", 2544 af, hname, htons(tmp.su_port)); 2545 } 2546 } 2547 } 2548#undef UC 2549 } else 2550 printf(" No data connection\r\n"); 2551 reply(211, "End of status."); 2552} 2553 2554void 2555fatalerror(char *s) 2556{ 2557 2558 reply(451, "Error in server: %s", s); 2559 reply(221, "Closing connection due to server error."); 2560 dologout(0); 2561 /* NOTREACHED */ 2562} 2563 2564void 2565reply(int n, const char *fmt, ...) 2566{ 2567 va_list ap; 2568 2569 (void)printf("%d ", n); 2570 va_start(ap, fmt); 2571 (void)vprintf(fmt, ap); 2572 va_end(ap); 2573 (void)printf("\r\n"); 2574 (void)fflush(stdout); 2575 if (ftpdebug) { 2576 syslog(LOG_DEBUG, "<--- %d ", n); 2577 va_start(ap, fmt); 2578 vsyslog(LOG_DEBUG, fmt, ap); 2579 va_end(ap); 2580 } 2581} 2582 2583void 2584lreply(int n, const char *fmt, ...) 2585{ 2586 va_list ap; 2587 2588 (void)printf("%d- ", n); 2589 va_start(ap, fmt); 2590 (void)vprintf(fmt, ap); 2591 va_end(ap); 2592 (void)printf("\r\n"); 2593 (void)fflush(stdout); 2594 if (ftpdebug) { 2595 syslog(LOG_DEBUG, "<--- %d- ", n); 2596 va_start(ap, fmt); 2597 vsyslog(LOG_DEBUG, fmt, ap); 2598 va_end(ap); 2599 } 2600} 2601 2602static void 2603ack(char *s) 2604{ 2605 2606 reply(250, "%s command successful.", s); 2607} 2608 2609void 2610nack(char *s) 2611{ 2612 2613 reply(502, "%s command not implemented.", s); 2614} 2615 2616/* ARGSUSED */ 2617void 2618yyerror(char *s) 2619{ 2620 char *cp; 2621 2622 if ((cp = strchr(cbuf,'\n'))) 2623 *cp = '\0'; 2624 reply(500, "%s: command not understood.", cbuf); 2625} 2626 2627void 2628delete(char *name) 2629{ 2630 struct stat st; 2631 2632 LOGCMD("delete", name); 2633 if (lstat(name, &st) < 0) { 2634 perror_reply(550, name); 2635 return; 2636 } 2637 if (S_ISDIR(st.st_mode)) { 2638 if (rmdir(name) < 0) { 2639 perror_reply(550, name); 2640 return; 2641 } 2642 goto done; 2643 } 2644 if (guest && noguestmod) { 2645 reply(550, "Operation not permitted."); 2646 return; 2647 } 2648 if (unlink(name) < 0) { 2649 perror_reply(550, name); 2650 return; 2651 } 2652done: 2653 ack("DELE"); 2654} 2655 2656void 2657cwd(char *path) 2658{ 2659 2660 if (chdir(path) < 0) 2661 perror_reply(550, path); 2662 else 2663 ack("CWD"); 2664} 2665 2666void 2667makedir(char *name) 2668{ 2669 char *s; 2670 2671 LOGCMD("mkdir", name); 2672 if (guest && noguestmkd) 2673 reply(550, "Operation not permitted."); 2674 else if (mkdir(name, 0777) < 0) 2675 perror_reply(550, name); 2676 else { 2677 if ((s = doublequote(name)) == NULL) 2678 fatalerror("Ran out of memory."); 2679 reply(257, "\"%s\" directory created.", s); 2680 free(s); 2681 } 2682} 2683 2684void 2685removedir(char *name) 2686{ 2687 2688 LOGCMD("rmdir", name); 2689 if (rmdir(name) < 0) 2690 perror_reply(550, name); 2691 else 2692 ack("RMD"); 2693} 2694 2695void 2696pwd(void) 2697{ 2698 char *s, path[MAXPATHLEN + 1]; 2699 2700 if (getcwd(path, sizeof(path)) == NULL) 2701 perror_reply(550, "Get current directory"); 2702 else { 2703 if ((s = doublequote(path)) == NULL) 2704 fatalerror("Ran out of memory."); 2705 reply(257, "\"%s\" is current directory.", s); 2706 free(s); 2707 } 2708} 2709 2710char * 2711renamefrom(char *name) 2712{ 2713 struct stat st; 2714 2715 if (guest && noguestmod) { 2716 reply(550, "Operation not permitted."); 2717 return (NULL); 2718 } 2719 if (lstat(name, &st) < 0) { 2720 perror_reply(550, name); 2721 return (NULL); 2722 } 2723 reply(350, "File exists, ready for destination name."); 2724 return (name); 2725} 2726 2727void 2728renamecmd(char *from, char *to) 2729{ 2730 struct stat st; 2731 2732 LOGCMD2("rename", from, to); 2733 2734 if (guest && (stat(to, &st) == 0)) { 2735 reply(550, "%s: permission denied.", to); 2736 return; 2737 } 2738 2739 if (rename(from, to) < 0) 2740 perror_reply(550, "rename"); 2741 else 2742 ack("RNTO"); 2743} 2744 2745static void 2746dolog(struct sockaddr *who) 2747{ 2748 char who_name[NI_MAXHOST]; 2749 2750 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2751 remotehost[sizeof(remotehost) - 1] = 0; 2752 if (getnameinfo(who, who->sa_len, 2753 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2754 *who_name = 0; 2755 who_name[sizeof(who_name) - 1] = 0; 2756 2757#ifdef SETPROCTITLE 2758#ifdef VIRTUAL_HOSTING 2759 if (thishost != firsthost) 2760 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2761 remotehost, hostname); 2762 else 2763#endif 2764 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2765 remotehost); 2766 setproctitle("%s", proctitle); 2767#endif /* SETPROCTITLE */ 2768 2769 if (logging) { 2770#ifdef VIRTUAL_HOSTING 2771 if (thishost != firsthost) 2772 syslog(LOG_INFO, "connection from %s (%s) to %s", 2773 remotehost, who_name, hostname); 2774 else 2775#endif 2776 syslog(LOG_INFO, "connection from %s (%s)", 2777 remotehost, who_name); 2778 } 2779} 2780 2781/* 2782 * Record logout in wtmp file 2783 * and exit with supplied status. 2784 */ 2785void 2786dologout(int status) 2787{ 2788 2789 if (logged_in && dowtmp) { 2790 (void) seteuid(0); 2791#ifdef LOGIN_CAP 2792 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 2793 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 2794 LOGIN_SETENV)); 2795#endif 2796 ftpd_logwtmp(wtmpid, NULL, NULL); 2797 } 2798 /* beware of flushing buffers after a SIGPIPE */ 2799 _exit(status); 2800} 2801 2802static void 2803sigurg(int signo) 2804{ 2805 2806 recvurg = 1; 2807} 2808 2809static void 2810maskurg(int flag) 2811{ 2812 int oerrno; 2813 sigset_t sset; 2814 2815 if (!transflag) { 2816 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2817 return; 2818 } 2819 oerrno = errno; 2820 sigemptyset(&sset); 2821 sigaddset(&sset, SIGURG); 2822 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2823 errno = oerrno; 2824} 2825 2826static void 2827flagxfer(int flag) 2828{ 2829 2830 if (flag) { 2831 if (transflag) 2832 syslog(LOG_ERR, "Internal: flagxfer(1): " 2833 "transfer already under way"); 2834 transflag = 1; 2835 maskurg(0); 2836 recvurg = 0; 2837 } else { 2838 if (!transflag) 2839 syslog(LOG_ERR, "Internal: flagxfer(0): " 2840 "no active transfer"); 2841 maskurg(1); 2842 transflag = 0; 2843 } 2844} 2845 2846/* 2847 * Returns 0 if OK to resume or -1 if abort requested. 2848 */ 2849static int 2850myoob(void) 2851{ 2852 char *cp; 2853 int ret; 2854 2855 if (!transflag) { 2856 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2857 return (0); 2858 } 2859 cp = tmpline; 2860 ret = get_line(cp, 7, stdin); 2861 if (ret == -1) { 2862 reply(221, "You could at least say goodbye."); 2863 dologout(0); 2864 } else if (ret == -2) { 2865 /* Ignore truncated command. */ 2866 return (0); 2867 } 2868 upper(cp); 2869 if (strcmp(cp, "ABOR\r\n") == 0) { 2870 tmpline[0] = '\0'; 2871 reply(426, "Transfer aborted. Data connection closed."); 2872 reply(226, "Abort successful."); 2873 return (-1); 2874 } 2875 if (strcmp(cp, "STAT\r\n") == 0) { 2876 tmpline[0] = '\0'; 2877 if (file_size != -1) 2878 reply(213, "Status: %jd of %jd bytes transferred.", 2879 (intmax_t)byte_count, (intmax_t)file_size); 2880 else 2881 reply(213, "Status: %jd bytes transferred.", 2882 (intmax_t)byte_count); 2883 } 2884 return (0); 2885} 2886 2887/* 2888 * Note: a response of 425 is not mentioned as a possible response to 2889 * the PASV command in RFC959. However, it has been blessed as 2890 * a legitimate response by Jon Postel in a telephone conversation 2891 * with Rick Adams on 25 Jan 89. 2892 */ 2893void 2894passive(void) 2895{ 2896 socklen_t len; 2897 int on; 2898 char *p, *a; 2899 2900 if (pdata >= 0) /* close old port if one set */ 2901 close(pdata); 2902 2903 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2904 if (pdata < 0) { 2905 perror_reply(425, "Can't open passive connection"); 2906 return; 2907 } 2908 on = 1; 2909 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2910 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2911 2912 (void) seteuid(0); 2913 2914#ifdef IP_PORTRANGE 2915 if (ctrl_addr.su_family == AF_INET) { 2916 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2917 : IP_PORTRANGE_DEFAULT; 2918 2919 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2920 &on, sizeof(on)) < 0) 2921 goto pasv_error; 2922 } 2923#endif 2924#ifdef IPV6_PORTRANGE 2925 if (ctrl_addr.su_family == AF_INET6) { 2926 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2927 : IPV6_PORTRANGE_DEFAULT; 2928 2929 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2930 &on, sizeof(on)) < 0) 2931 goto pasv_error; 2932 } 2933#endif 2934 2935 pasv_addr = ctrl_addr; 2936 pasv_addr.su_port = 0; 2937 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2938 goto pasv_error; 2939 2940 (void) seteuid(pw->pw_uid); 2941 2942 len = sizeof(pasv_addr); 2943 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2944 goto pasv_error; 2945 if (listen(pdata, 1) < 0) 2946 goto pasv_error; 2947 if (pasv_addr.su_family == AF_INET) 2948 a = (char *) &pasv_addr.su_sin.sin_addr; 2949 else if (pasv_addr.su_family == AF_INET6 && 2950 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2951 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2952 else 2953 goto pasv_error; 2954 2955 p = (char *) &pasv_addr.su_port; 2956 2957#define UC(b) (((int) b) & 0xff) 2958 2959 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2960 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2961 return; 2962 2963pasv_error: 2964 (void) seteuid(pw->pw_uid); 2965 (void) close(pdata); 2966 pdata = -1; 2967 perror_reply(425, "Can't open passive connection"); 2968 return; 2969} 2970 2971/* 2972 * Long Passive defined in RFC 1639. 2973 * 228 Entering Long Passive Mode 2974 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2975 */ 2976 2977void 2978long_passive(char *cmd, int pf) 2979{ 2980 socklen_t len; 2981 int on; 2982 char *p, *a; 2983 2984 if (pdata >= 0) /* close old port if one set */ 2985 close(pdata); 2986 2987 if (pf != PF_UNSPEC) { 2988 if (ctrl_addr.su_family != pf) { 2989 switch (ctrl_addr.su_family) { 2990 case AF_INET: 2991 pf = 1; 2992 break; 2993 case AF_INET6: 2994 pf = 2; 2995 break; 2996 default: 2997 pf = 0; 2998 break; 2999 } 3000 /* 3001 * XXX 3002 * only EPRT/EPSV ready clients will understand this 3003 */ 3004 if (strcmp(cmd, "EPSV") == 0 && pf) { 3005 reply(522, "Network protocol mismatch, " 3006 "use (%d)", pf); 3007 } else 3008 reply(501, "Network protocol mismatch."); /*XXX*/ 3009 3010 return; 3011 } 3012 } 3013 3014 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 3015 if (pdata < 0) { 3016 perror_reply(425, "Can't open passive connection"); 3017 return; 3018 } 3019 on = 1; 3020 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 3021 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 3022 3023 (void) seteuid(0); 3024 3025 pasv_addr = ctrl_addr; 3026 pasv_addr.su_port = 0; 3027 len = pasv_addr.su_len; 3028 3029#ifdef IP_PORTRANGE 3030 if (ctrl_addr.su_family == AF_INET) { 3031 on = restricted_data_ports ? IP_PORTRANGE_HIGH 3032 : IP_PORTRANGE_DEFAULT; 3033 3034 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 3035 &on, sizeof(on)) < 0) 3036 goto pasv_error; 3037 } 3038#endif 3039#ifdef IPV6_PORTRANGE 3040 if (ctrl_addr.su_family == AF_INET6) { 3041 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 3042 : IPV6_PORTRANGE_DEFAULT; 3043 3044 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 3045 &on, sizeof(on)) < 0) 3046 goto pasv_error; 3047 } 3048#endif 3049 3050 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 3051 goto pasv_error; 3052 3053 (void) seteuid(pw->pw_uid); 3054 3055 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 3056 goto pasv_error; 3057 if (listen(pdata, 1) < 0) 3058 goto pasv_error; 3059 3060#define UC(b) (((int) b) & 0xff) 3061 3062 if (strcmp(cmd, "LPSV") == 0) { 3063 p = (char *)&pasv_addr.su_port; 3064 switch (pasv_addr.su_family) { 3065 case AF_INET: 3066 a = (char *) &pasv_addr.su_sin.sin_addr; 3067 v4_reply: 3068 reply(228, 3069"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3070 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3071 2, UC(p[0]), UC(p[1])); 3072 return; 3073 case AF_INET6: 3074 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3075 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3076 goto v4_reply; 3077 } 3078 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3079 reply(228, 3080"Entering Long Passive Mode " 3081"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3082 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3083 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3084 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3085 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3086 2, UC(p[0]), UC(p[1])); 3087 return; 3088 } 3089 } else if (strcmp(cmd, "EPSV") == 0) { 3090 switch (pasv_addr.su_family) { 3091 case AF_INET: 3092 case AF_INET6: 3093 reply(229, "Entering Extended Passive Mode (|||%d|)", 3094 ntohs(pasv_addr.su_port)); 3095 return; 3096 } 3097 } else { 3098 /* more proper error code? */ 3099 } 3100 3101pasv_error: 3102 (void) seteuid(pw->pw_uid); 3103 (void) close(pdata); 3104 pdata = -1; 3105 perror_reply(425, "Can't open passive connection"); 3106 return; 3107} 3108 3109/* 3110 * Generate unique name for file with basename "local" 3111 * and open the file in order to avoid possible races. 3112 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3113 * Return descriptor to the file, set "name" to its name. 3114 * 3115 * Generates failure reply on error. 3116 */ 3117static int 3118guniquefd(char *local, char **name) 3119{ 3120 static char new[MAXPATHLEN]; 3121 struct stat st; 3122 char *cp; 3123 int count; 3124 int fd; 3125 3126 cp = strrchr(local, '/'); 3127 if (cp) 3128 *cp = '\0'; 3129 if (stat(cp ? local : ".", &st) < 0) { 3130 perror_reply(553, cp ? local : "."); 3131 return (-1); 3132 } 3133 if (cp) { 3134 /* 3135 * Let not overwrite dirname with counter suffix. 3136 * -4 is for /nn\0 3137 * In this extreme case dot won't be put in front of suffix. 3138 */ 3139 if (strlen(local) > sizeof(new) - 4) { 3140 reply(553, "Pathname too long."); 3141 return (-1); 3142 } 3143 *cp = '/'; 3144 } 3145 /* -4 is for the .nn<null> we put on the end below */ 3146 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3147 cp = new + strlen(new); 3148 /* 3149 * Don't generate dotfile unless requested explicitly. 3150 * This covers the case when basename gets truncated off 3151 * by buffer size. 3152 */ 3153 if (cp > new && cp[-1] != '/') 3154 *cp++ = '.'; 3155 for (count = 0; count < 100; count++) { 3156 /* At count 0 try unmodified name */ 3157 if (count) 3158 (void)sprintf(cp, "%d", count); 3159 if ((fd = open(count ? new : local, 3160 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3161 *name = count ? new : local; 3162 return (fd); 3163 } 3164 if (errno != EEXIST) { 3165 perror_reply(553, count ? new : local); 3166 return (-1); 3167 } 3168 } 3169 reply(452, "Unique file name cannot be created."); 3170 return (-1); 3171} 3172 3173/* 3174 * Format and send reply containing system error number. 3175 */ 3176void 3177perror_reply(int code, char *string) 3178{ 3179 3180 reply(code, "%s: %s.", string, strerror(errno)); 3181} 3182 3183static char *onefile[] = { 3184 "", 3185 0 3186}; 3187 3188void 3189send_file_list(char *whichf) 3190{ 3191 struct stat st; 3192 DIR *dirp = NULL; 3193 struct dirent *dir; 3194 FILE *dout = NULL; 3195 char **dirlist, *dirname; 3196 int simple = 0; 3197 int freeglob = 0; 3198 glob_t gl; 3199 3200 if (strpbrk(whichf, "~{[*?") != NULL) { 3201 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3202 3203 memset(&gl, 0, sizeof(gl)); 3204 gl.gl_matchc = MAXGLOBARGS; 3205 flags |= GLOB_LIMIT; 3206 freeglob = 1; 3207 if (glob(whichf, flags, 0, &gl)) { 3208 reply(550, "No matching files found."); 3209 goto out; 3210 } else if (gl.gl_pathc == 0) { 3211 errno = ENOENT; 3212 perror_reply(550, whichf); 3213 goto out; 3214 } 3215 dirlist = gl.gl_pathv; 3216 } else { 3217 onefile[0] = whichf; 3218 dirlist = onefile; 3219 simple = 1; 3220 } 3221 3222 while ((dirname = *dirlist++)) { 3223 if (stat(dirname, &st) < 0) { 3224 /* 3225 * If user typed "ls -l", etc, and the client 3226 * used NLST, do what the user meant. 3227 */ 3228 if (dirname[0] == '-' && *dirlist == NULL && 3229 dout == NULL) 3230 retrieve(_PATH_LS " %s", dirname); 3231 else 3232 perror_reply(550, whichf); 3233 goto out; 3234 } 3235 3236 if (S_ISREG(st.st_mode)) { 3237 if (dout == NULL) { 3238 dout = dataconn("file list", -1, "w"); 3239 if (dout == NULL) 3240 goto out; 3241 STARTXFER; 3242 } 3243 START_UNSAFE; 3244 fprintf(dout, "%s%s\n", dirname, 3245 type == TYPE_A ? "\r" : ""); 3246 END_UNSAFE; 3247 if (ferror(dout)) 3248 goto data_err; 3249 byte_count += strlen(dirname) + 3250 (type == TYPE_A ? 2 : 1); 3251 CHECKOOB(goto abrt); 3252 continue; 3253 } else if (!S_ISDIR(st.st_mode)) 3254 continue; 3255 3256 if ((dirp = opendir(dirname)) == NULL) 3257 continue; 3258 3259 while ((dir = readdir(dirp)) != NULL) { 3260 char nbuf[MAXPATHLEN]; 3261 3262 CHECKOOB(goto abrt); 3263 3264 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3265 continue; 3266 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3267 dir->d_namlen == 2) 3268 continue; 3269 3270 snprintf(nbuf, sizeof(nbuf), 3271 "%s/%s", dirname, dir->d_name); 3272 3273 /* 3274 * We have to do a stat to insure it's 3275 * not a directory or special file. 3276 */ 3277 if (simple || (stat(nbuf, &st) == 0 && 3278 S_ISREG(st.st_mode))) { 3279 if (dout == NULL) { 3280 dout = dataconn("file list", -1, "w"); 3281 if (dout == NULL) 3282 goto out; 3283 STARTXFER; 3284 } 3285 START_UNSAFE; 3286 if (nbuf[0] == '.' && nbuf[1] == '/') 3287 fprintf(dout, "%s%s\n", &nbuf[2], 3288 type == TYPE_A ? "\r" : ""); 3289 else 3290 fprintf(dout, "%s%s\n", nbuf, 3291 type == TYPE_A ? "\r" : ""); 3292 END_UNSAFE; 3293 if (ferror(dout)) 3294 goto data_err; 3295 byte_count += strlen(nbuf) + 3296 (type == TYPE_A ? 2 : 1); 3297 CHECKOOB(goto abrt); 3298 } 3299 } 3300 (void) closedir(dirp); 3301 dirp = NULL; 3302 } 3303 3304 if (dout == NULL) 3305 reply(550, "No files found."); 3306 else if (ferror(dout)) 3307data_err: perror_reply(550, "Data connection"); 3308 else 3309 reply(226, "Transfer complete."); 3310out: 3311 if (dout) { 3312 ENDXFER; 3313abrt: 3314 (void) fclose(dout); 3315 data = -1; 3316 pdata = -1; 3317 } 3318 if (dirp) 3319 (void) closedir(dirp); 3320 if (freeglob) { 3321 freeglob = 0; 3322 globfree(&gl); 3323 } 3324} 3325 3326void 3327reapchild(int signo) 3328{ 3329 while (waitpid(-1, NULL, WNOHANG) > 0); 3330} 3331 3332#ifdef OLD_SETPROCTITLE 3333/* 3334 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3335 * Warning, since this is usually started from inetd.conf, it often doesn't 3336 * have much of an environment or arglist to overwrite. 3337 */ 3338void 3339setproctitle(const char *fmt, ...) 3340{ 3341 int i; 3342 va_list ap; 3343 char *p, *bp, ch; 3344 char buf[LINE_MAX]; 3345 3346 va_start(ap, fmt); 3347 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3348 3349 /* make ps print our process name */ 3350 p = Argv[0]; 3351 *p++ = '-'; 3352 3353 i = strlen(buf); 3354 if (i > LastArgv - p - 2) { 3355 i = LastArgv - p - 2; 3356 buf[i] = '\0'; 3357 } 3358 bp = buf; 3359 while (ch = *bp++) 3360 if (ch != '\n' && ch != '\r') 3361 *p++ = ch; 3362 while (p < LastArgv) 3363 *p++ = ' '; 3364} 3365#endif /* OLD_SETPROCTITLE */ 3366 3367static void 3368appendf(char **strp, char *fmt, ...) 3369{ 3370 va_list ap; 3371 char *ostr, *p; 3372 3373 va_start(ap, fmt); 3374 vasprintf(&p, fmt, ap); 3375 va_end(ap); 3376 if (p == NULL) 3377 fatalerror("Ran out of memory."); 3378 if (*strp == NULL) 3379 *strp = p; 3380 else { 3381 ostr = *strp; 3382 asprintf(strp, "%s%s", ostr, p); 3383 if (*strp == NULL) 3384 fatalerror("Ran out of memory."); 3385 free(ostr); 3386 } 3387} 3388 3389static void 3390logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3391{ 3392 char *msg = NULL; 3393 char wd[MAXPATHLEN + 1]; 3394 3395 if (logging <= 1) 3396 return; 3397 3398 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3399 strcpy(wd, strerror(errno)); 3400 3401 appendf(&msg, "%s", cmd); 3402 if (file1) 3403 appendf(&msg, " %s", file1); 3404 if (file2) 3405 appendf(&msg, " %s", file2); 3406 if (cnt >= 0) 3407 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3408 appendf(&msg, " (wd: %s", wd); 3409 if (guest || dochroot) 3410 appendf(&msg, "; chrooted"); 3411 appendf(&msg, ")"); 3412 syslog(LOG_INFO, "%s", msg); 3413 free(msg); 3414} 3415 3416static void 3417logxfer(char *name, off_t size, time_t start) 3418{ 3419 char buf[MAXPATHLEN + 1024]; 3420 char path[MAXPATHLEN + 1]; 3421 time_t now; 3422 3423 if (statfd >= 0) { 3424 time(&now); 3425 if (realpath(name, path) == NULL) { 3426 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3427 return; 3428 } 3429 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3430 ctime(&now)+4, ident, remotehost, 3431 path, (intmax_t)size, 3432 (long)(now - start + (now == start))); 3433 write(statfd, buf, strlen(buf)); 3434 } 3435} 3436 3437static char * 3438doublequote(char *s) 3439{ 3440 int n; 3441 char *p, *s2; 3442 3443 for (p = s, n = 0; *p; p++) 3444 if (*p == '"') 3445 n++; 3446 3447 if ((s2 = malloc(p - s + n + 1)) == NULL) 3448 return (NULL); 3449 3450 for (p = s2; *s; s++, p++) { 3451 if ((*p = *s) == '"') 3452 *(++p) = '"'; 3453 } 3454 *p = '\0'; 3455 3456 return (s2); 3457} 3458 3459/* setup server socket for specified address family */ 3460/* if af is PF_UNSPEC more than one socket may be returned */ 3461/* the returned list is dynamically allocated, so caller needs to free it */ 3462static int * 3463socksetup(int af, char *bindname, const char *bindport) 3464{ 3465 struct addrinfo hints, *res, *r; 3466 int error, maxs, *s, *socks; 3467 const int on = 1; 3468 3469 memset(&hints, 0, sizeof(hints)); 3470 hints.ai_flags = AI_PASSIVE; 3471 hints.ai_family = af; 3472 hints.ai_socktype = SOCK_STREAM; 3473 error = getaddrinfo(bindname, bindport, &hints, &res); 3474 if (error) { 3475 syslog(LOG_ERR, "%s", gai_strerror(error)); 3476 if (error == EAI_SYSTEM) 3477 syslog(LOG_ERR, "%s", strerror(errno)); 3478 return NULL; 3479 } 3480 3481 /* Count max number of sockets we may open */ 3482 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3483 ; 3484 socks = malloc((maxs + 1) * sizeof(int)); 3485 if (!socks) { 3486 freeaddrinfo(res); 3487 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3488 return NULL; 3489 } 3490 3491 *socks = 0; /* num of sockets counter at start of array */ 3492 s = socks + 1; 3493 for (r = res; r; r = r->ai_next) { 3494 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3495 if (*s < 0) { 3496 syslog(LOG_DEBUG, "control socket: %m"); 3497 continue; 3498 } 3499 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3500 &on, sizeof(on)) < 0) 3501 syslog(LOG_WARNING, 3502 "control setsockopt (SO_REUSEADDR): %m"); 3503 if (r->ai_family == AF_INET6) { 3504 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3505 &on, sizeof(on)) < 0) 3506 syslog(LOG_WARNING, 3507 "control setsockopt (IPV6_V6ONLY): %m"); 3508 } 3509 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3510 syslog(LOG_DEBUG, "control bind: %m"); 3511 close(*s); 3512 continue; 3513 } 3514 (*socks)++; 3515 s++; 3516 } 3517 3518 if (res) 3519 freeaddrinfo(res); 3520 3521 if (*socks == 0) { 3522 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3523 free(socks); 3524 return NULL; 3525 } 3526 return(socks); 3527} 3528