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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#if 0 31#ifndef lint 32static char copyright[] = 33"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 34 The Regents of the University of California. All rights reserved.\n"; 35#endif /* not lint */ 36#endif 37 38#ifndef lint 39#if 0 40static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 41#endif 42#endif /* not lint */ 43 44#include <sys/cdefs.h> 45__FBSDID("$FreeBSD: releng/11.0/libexec/ftpd/ftpd.c 301517 2016-06-06 20:00:13Z lidl $"); 46 47/* 48 * FTP server. 49 */ 50#include <sys/param.h> 51#include <sys/ioctl.h> 52#include <sys/mman.h> 53#include <sys/socket.h> 54#include <sys/stat.h> 55#include <sys/time.h> 56#include <sys/wait.h> 57 58#include <netinet/in.h> 59#include <netinet/in_systm.h> 60#include <netinet/ip.h> 61#include <netinet/tcp.h> 62 63#define FTP_NAMES 64#include <arpa/ftp.h> 65#include <arpa/inet.h> 66#include <arpa/telnet.h> 67 68#include <ctype.h> 69#include <dirent.h> 70#include <err.h> 71#include <errno.h> 72#include <fcntl.h> 73#include <glob.h> 74#include <limits.h> 75#include <netdb.h> 76#include <pwd.h> 77#include <grp.h> 78#include <opie.h> 79#include <signal.h> 80#include <stdint.h> 81#include <stdio.h> 82#include <stdlib.h> 83#include <string.h> 84#include <syslog.h> 85#include <time.h> 86#include <unistd.h> 87#include <libutil.h> 88#ifdef LOGIN_CAP 89#include <login_cap.h> 90#endif 91 92#ifdef USE_PAM 93#include <security/pam_appl.h> 94#endif 95 96#ifdef USE_BLACKLIST 97#include "blacklist_client.h" 98#endif 99 100#include "pathnames.h" 101#include "extern.h" 102 103#include <stdarg.h> 104 105static char version[] = "Version 6.00LS"; 106#undef main 107 108union sockunion ctrl_addr; 109union sockunion data_source; 110union sockunion data_dest; 111union sockunion his_addr; 112union sockunion pasv_addr; 113 114int daemon_mode; 115int data; 116int dataport; 117int hostinfo = 1; /* print host-specific info in messages */ 118int logged_in; 119struct passwd *pw; 120char *homedir; 121int ftpdebug; 122int timeout = 900; /* timeout after 15 minutes of inactivity */ 123int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 124int logging; 125int restricted_data_ports = 1; 126int paranoid = 1; /* be extra careful about security */ 127int anon_only = 0; /* Only anonymous ftp allowed */ 128int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 129int guest; 130int dochroot; 131char *chrootdir; 132int dowtmp = 1; 133int stats; 134int statfd = -1; 135int type; 136int form; 137int stru; /* avoid C keyword */ 138int mode; 139int usedefault = 1; /* for data transfers */ 140int pdata = -1; /* for passive mode */ 141int readonly = 0; /* Server is in readonly mode. */ 142int noepsv = 0; /* EPSV command is disabled. */ 143int noretr = 0; /* RETR command is disabled. */ 144int noguestretr = 0; /* RETR command is disabled for anon users. */ 145int noguestmkd = 0; /* MKD command is disabled for anon users. */ 146int noguestmod = 1; /* anon users may not modify existing files. */ 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:AdDEhlmMoOp: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 'd': 331 ftpdebug++; 332 break; 333 334 case 'D': 335 daemon_mode++; 336 break; 337 338 case 'E': 339 noepsv = 1; 340 break; 341 342 case 'h': 343 hostinfo = 0; 344 break; 345 346 case 'l': 347 logging++; /* > 1 == extra logging */ 348 break; 349 350 case 'm': 351 noguestmod = 0; 352 break; 353 354 case 'M': 355 noguestmkd = 1; 356 break; 357 358 case 'o': 359 noretr = 1; 360 break; 361 362 case 'O': 363 noguestretr = 1; 364 break; 365 366 case 'p': 367 pid_file = optarg; 368 break; 369 370 case 'P': 371 bindport = optarg; 372 break; 373 374 case 'r': 375 readonly = 1; 376 break; 377 378 case 'R': 379 paranoid = 0; 380 break; 381 382 case 'S': 383 stats++; 384 break; 385 386 case 't': 387 timeout = atoi(optarg); 388 if (maxtimeout < timeout) 389 maxtimeout = timeout; 390 break; 391 392 case 'T': 393 maxtimeout = atoi(optarg); 394 if (timeout > maxtimeout) 395 timeout = maxtimeout; 396 break; 397 398 case 'u': 399 { 400 long val = 0; 401 402 val = strtol(optarg, &optarg, 8); 403 if (*optarg != '\0' || val < 0) 404 syslog(LOG_WARNING, "bad value for -u"); 405 else 406 defumask = val; 407 break; 408 } 409 case 'U': 410 restricted_data_ports = 0; 411 break; 412 413 case 'v': 414 ftpdebug++; 415 break; 416 417 case 'W': 418 dowtmp = 0; 419 break; 420 421 default: 422 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 423 break; 424 } 425 } 426 427 if (daemon_mode) { 428 int *ctl_sock, fd, maxfd = -1, nfds, i; 429 fd_set defreadfds, readfds; 430 pid_t pid; 431 struct pidfh *pfh; 432 433 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) { 434 if (errno == EEXIST) { 435 syslog(LOG_ERR, "%s already running, pid %d", 436 getprogname(), (int)pid); 437 exit(1); 438 } 439 syslog(LOG_WARNING, "pidfile_open: %m"); 440 } 441 442 /* 443 * Detach from parent. 444 */ 445 if (daemon(1, 1) < 0) { 446 syslog(LOG_ERR, "failed to become a daemon"); 447 exit(1); 448 } 449 450 if (pfh != NULL && pidfile_write(pfh) == -1) 451 syslog(LOG_WARNING, "pidfile_write: %m"); 452 453 sa.sa_handler = reapchild; 454 (void)sigaction(SIGCHLD, &sa, NULL); 455 456#ifdef VIRTUAL_HOSTING 457 inithosts(family); 458#endif 459 460 /* 461 * Open a socket, bind it to the FTP port, and start 462 * listening. 463 */ 464 ctl_sock = socksetup(family, bindname, bindport); 465 if (ctl_sock == NULL) 466 exit(1); 467 468 FD_ZERO(&defreadfds); 469 for (i = 1; i <= *ctl_sock; i++) { 470 FD_SET(ctl_sock[i], &defreadfds); 471 if (listen(ctl_sock[i], 32) < 0) { 472 syslog(LOG_ERR, "control listen: %m"); 473 exit(1); 474 } 475 if (maxfd < ctl_sock[i]) 476 maxfd = ctl_sock[i]; 477 } 478 479 /* 480 * Loop forever accepting connection requests and forking off 481 * children to handle them. 482 */ 483 while (1) { 484 FD_COPY(&defreadfds, &readfds); 485 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 486 if (nfds <= 0) { 487 if (nfds < 0 && errno != EINTR) 488 syslog(LOG_WARNING, "select: %m"); 489 continue; 490 } 491 492 pid = -1; 493 for (i = 1; i <= *ctl_sock; i++) 494 if (FD_ISSET(ctl_sock[i], &readfds)) { 495 addrlen = sizeof(his_addr); 496 fd = accept(ctl_sock[i], 497 (struct sockaddr *)&his_addr, 498 &addrlen); 499 if (fd == -1) { 500 syslog(LOG_WARNING, 501 "accept: %m"); 502 continue; 503 } 504 switch (pid = fork()) { 505 case 0: 506 /* child */ 507 (void) dup2(fd, s); 508 (void) dup2(fd, STDOUT_FILENO); 509 (void) close(fd); 510 for (i = 1; i <= *ctl_sock; i++) 511 close(ctl_sock[i]); 512 if (pfh != NULL) 513 pidfile_close(pfh); 514 goto gotchild; 515 case -1: 516 syslog(LOG_WARNING, "fork: %m"); 517 /* FALLTHROUGH */ 518 default: 519 close(fd); 520 } 521 } 522 } 523 } else { 524 addrlen = sizeof(his_addr); 525 if (getpeername(s, (struct sockaddr *)&his_addr, &addrlen) < 0) { 526 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 527 exit(1); 528 } 529 530#ifdef VIRTUAL_HOSTING 531 if (his_addr.su_family == AF_INET6 && 532 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 533 family = AF_INET; 534 else 535 family = his_addr.su_family; 536 inithosts(family); 537#endif 538 } 539 540gotchild: 541 sa.sa_handler = SIG_DFL; 542 (void)sigaction(SIGCHLD, &sa, NULL); 543 544 sa.sa_handler = sigurg; 545 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 546 (void)sigaction(SIGURG, &sa, NULL); 547 548 sigfillset(&sa.sa_mask); /* block all signals in handler */ 549 sa.sa_flags = SA_RESTART; 550 sa.sa_handler = sigquit; 551 (void)sigaction(SIGHUP, &sa, NULL); 552 (void)sigaction(SIGINT, &sa, NULL); 553 (void)sigaction(SIGQUIT, &sa, NULL); 554 (void)sigaction(SIGTERM, &sa, NULL); 555 556 sa.sa_handler = lostconn; 557 (void)sigaction(SIGPIPE, &sa, NULL); 558 559 addrlen = sizeof(ctrl_addr); 560 if (getsockname(s, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 561 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 562 exit(1); 563 } 564 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 565#ifdef VIRTUAL_HOSTING 566 /* select our identity from virtual host table */ 567 selecthost(&ctrl_addr); 568#endif 569#ifdef IP_TOS 570 if (ctrl_addr.su_family == AF_INET) 571 { 572 tos = IPTOS_LOWDELAY; 573 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 574 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 575 } 576#endif 577 /* 578 * Disable Nagle on the control channel so that we don't have to wait 579 * for peer's ACK before issuing our next reply. 580 */ 581 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 582 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 583 584 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 585 586 (void)snprintf(wtmpid, sizeof(wtmpid), "%xftpd", getpid()); 587 588 /* Try to handle urgent data inline */ 589#ifdef SO_OOBINLINE 590 if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 591 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 592#endif 593 594#ifdef F_SETOWN 595 if (fcntl(s, F_SETOWN, getpid()) == -1) 596 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 597#endif 598 dolog((struct sockaddr *)&his_addr); 599 /* 600 * Set up default state 601 */ 602 data = -1; 603 type = TYPE_A; 604 form = FORM_N; 605 stru = STRU_F; 606 mode = MODE_S; 607 tmpline[0] = '\0'; 608 609 /* If logins are disabled, print out the message. */ 610 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 611 while (fgets(line, sizeof(line), fd) != NULL) { 612 if ((cp = strchr(line, '\n')) != NULL) 613 *cp = '\0'; 614 lreply(530, "%s", line); 615 } 616 (void) fflush(stdout); 617 (void) fclose(fd); 618 reply(530, "System not available."); 619 exit(0); 620 } 621#ifdef VIRTUAL_HOSTING 622 fd = fopen(thishost->welcome, "r"); 623#else 624 fd = fopen(_PATH_FTPWELCOME, "r"); 625#endif 626 if (fd != NULL) { 627 while (fgets(line, sizeof(line), fd) != NULL) { 628 if ((cp = strchr(line, '\n')) != NULL) 629 *cp = '\0'; 630 lreply(220, "%s", line); 631 } 632 (void) fflush(stdout); 633 (void) fclose(fd); 634 /* reply(220,) must follow */ 635 } 636#ifndef VIRTUAL_HOSTING 637 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 638 fatalerror("Ran out of memory."); 639 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 640 hostname[0] = '\0'; 641 hostname[MAXHOSTNAMELEN - 1] = '\0'; 642#endif 643 if (hostinfo) 644 reply(220, "%s FTP server (%s) ready.", hostname, version); 645 else 646 reply(220, "FTP server ready."); 647#ifdef USE_BLACKLIST 648 blacklist_init(); 649#endif 650 for (;;) 651 (void) yyparse(); 652 /* NOTREACHED */ 653} 654 655static void 656lostconn(int signo) 657{ 658 659 if (ftpdebug) 660 syslog(LOG_DEBUG, "lost connection"); 661 dologout(1); 662} 663 664static void 665sigquit(int signo) 666{ 667 668 syslog(LOG_ERR, "got signal %d", signo); 669 dologout(1); 670} 671 672#ifdef VIRTUAL_HOSTING 673/* 674 * read in virtual host tables (if they exist) 675 */ 676 677static void 678inithosts(int family) 679{ 680 int insert; 681 size_t len; 682 FILE *fp; 683 char *cp, *mp, *line; 684 char *hostname; 685 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 686 struct ftphost *hrp, *lhrp; 687 struct addrinfo hints, *res, *ai; 688 689 /* 690 * Fill in the default host information 691 */ 692 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 693 fatalerror("Ran out of memory."); 694 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 695 hostname[0] = '\0'; 696 hostname[MAXHOSTNAMELEN - 1] = '\0'; 697 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 698 fatalerror("Ran out of memory."); 699 hrp->hostname = hostname; 700 hrp->hostinfo = NULL; 701 702 memset(&hints, 0, sizeof(hints)); 703 hints.ai_flags = AI_PASSIVE; 704 hints.ai_family = family; 705 hints.ai_socktype = SOCK_STREAM; 706 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 707 hrp->hostinfo = res; 708 hrp->statfile = _PATH_FTPDSTATFILE; 709 hrp->welcome = _PATH_FTPWELCOME; 710 hrp->loginmsg = _PATH_FTPLOGINMESG; 711 hrp->anonuser = "ftp"; 712 hrp->next = NULL; 713 thishost = firsthost = lhrp = hrp; 714 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 715 int addrsize, gothost; 716 void *addr; 717 struct hostent *hp; 718 719 while ((line = fgetln(fp, &len)) != NULL) { 720 int i, hp_error; 721 722 /* skip comments */ 723 if (line[0] == '#') 724 continue; 725 if (line[len - 1] == '\n') { 726 line[len - 1] = '\0'; 727 mp = NULL; 728 } else { 729 if ((mp = malloc(len + 1)) == NULL) 730 fatalerror("Ran out of memory."); 731 memcpy(mp, line, len); 732 mp[len] = '\0'; 733 line = mp; 734 } 735 cp = strtok(line, " \t"); 736 /* skip empty lines */ 737 if (cp == NULL) 738 goto nextline; 739 vhost = cp; 740 741 /* set defaults */ 742 anonuser = "ftp"; 743 statfile = _PATH_FTPDSTATFILE; 744 welcome = _PATH_FTPWELCOME; 745 loginmsg = _PATH_FTPLOGINMESG; 746 747 /* 748 * Preparse the line so we can use its info 749 * for all the addresses associated with 750 * the virtual host name. 751 * Field 0, the virtual host name, is special: 752 * it's already parsed off and will be strdup'ed 753 * later, after we know its canonical form. 754 */ 755 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 756 if (*cp != '-' && (cp = strdup(cp))) 757 switch (i) { 758 case 1: /* anon user permissions */ 759 anonuser = cp; 760 break; 761 case 2: /* statistics file */ 762 statfile = cp; 763 break; 764 case 3: /* welcome message */ 765 welcome = cp; 766 break; 767 case 4: /* login message */ 768 loginmsg = cp; 769 break; 770 default: /* programming error */ 771 abort(); 772 /* NOTREACHED */ 773 } 774 775 hints.ai_flags = AI_PASSIVE; 776 hints.ai_family = family; 777 hints.ai_socktype = SOCK_STREAM; 778 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 779 goto nextline; 780 for (ai = res; ai != NULL && ai->ai_addr != NULL; 781 ai = ai->ai_next) { 782 783 gothost = 0; 784 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 785 struct addrinfo *hi; 786 787 for (hi = hrp->hostinfo; hi != NULL; 788 hi = hi->ai_next) 789 if (hi->ai_addrlen == ai->ai_addrlen && 790 memcmp(hi->ai_addr, 791 ai->ai_addr, 792 ai->ai_addr->sa_len) == 0) { 793 gothost++; 794 break; 795 } 796 if (gothost) 797 break; 798 } 799 if (hrp == NULL) { 800 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 801 goto nextline; 802 hrp->hostname = NULL; 803 insert = 1; 804 } else { 805 if (hrp->hostinfo && hrp->hostinfo != res) 806 freeaddrinfo(hrp->hostinfo); 807 insert = 0; /* host already in the chain */ 808 } 809 hrp->hostinfo = res; 810 811 /* 812 * determine hostname to use. 813 * force defined name if there is a valid alias 814 * otherwise fallback to primary hostname 815 */ 816 /* XXX: getaddrinfo() can't do alias check */ 817 switch(hrp->hostinfo->ai_family) { 818 case AF_INET: 819 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 820 addrsize = sizeof(struct in_addr); 821 break; 822 case AF_INET6: 823 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 824 addrsize = sizeof(struct in6_addr); 825 break; 826 default: 827 /* should not reach here */ 828 freeaddrinfo(hrp->hostinfo); 829 if (insert) 830 free(hrp); /*not in chain, can free*/ 831 else 832 hrp->hostinfo = NULL; /*mark as blank*/ 833 goto nextline; 834 /* NOTREACHED */ 835 } 836 if ((hp = getipnodebyaddr(addr, addrsize, 837 hrp->hostinfo->ai_family, 838 &hp_error)) != NULL) { 839 if (strcmp(vhost, hp->h_name) != 0) { 840 if (hp->h_aliases == NULL) 841 vhost = hp->h_name; 842 else { 843 i = 0; 844 while (hp->h_aliases[i] && 845 strcmp(vhost, hp->h_aliases[i]) != 0) 846 ++i; 847 if (hp->h_aliases[i] == NULL) 848 vhost = hp->h_name; 849 } 850 } 851 } 852 if (hrp->hostname && 853 strcmp(hrp->hostname, vhost) != 0) { 854 free(hrp->hostname); 855 hrp->hostname = NULL; 856 } 857 if (hrp->hostname == NULL && 858 (hrp->hostname = strdup(vhost)) == NULL) { 859 freeaddrinfo(hrp->hostinfo); 860 hrp->hostinfo = NULL; /* mark as blank */ 861 if (hp) 862 freehostent(hp); 863 goto nextline; 864 } 865 hrp->anonuser = anonuser; 866 hrp->statfile = statfile; 867 hrp->welcome = welcome; 868 hrp->loginmsg = loginmsg; 869 if (insert) { 870 hrp->next = NULL; 871 lhrp->next = hrp; 872 lhrp = hrp; 873 } 874 if (hp) 875 freehostent(hp); 876 } 877nextline: 878 if (mp) 879 free(mp); 880 } 881 (void) fclose(fp); 882 } 883} 884 885static void 886selecthost(union sockunion *su) 887{ 888 struct ftphost *hrp; 889 u_int16_t port; 890#ifdef INET6 891 struct in6_addr *mapped_in6 = NULL; 892#endif 893 struct addrinfo *hi; 894 895#ifdef INET6 896 /* 897 * XXX IPv4 mapped IPv6 addr consideraton, 898 * specified in rfc2373. 899 */ 900 if (su->su_family == AF_INET6 && 901 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 902 mapped_in6 = &su->su_sin6.sin6_addr; 903#endif 904 905 hrp = thishost = firsthost; /* default */ 906 port = su->su_port; 907 su->su_port = 0; 908 while (hrp != NULL) { 909 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 910 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 911 thishost = hrp; 912 goto found; 913 } 914#ifdef INET6 915 /* XXX IPv4 mapped IPv6 addr consideraton */ 916 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 917 (memcmp(&mapped_in6->s6_addr[12], 918 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 919 sizeof(struct in_addr)) == 0)) { 920 thishost = hrp; 921 goto found; 922 } 923#endif 924 } 925 hrp = hrp->next; 926 } 927found: 928 su->su_port = port; 929 /* setup static variables as appropriate */ 930 hostname = thishost->hostname; 931 ftpuser = thishost->anonuser; 932} 933#endif 934 935/* 936 * Helper function for sgetpwnam(). 937 */ 938static char * 939sgetsave(char *s) 940{ 941 char *new = malloc(strlen(s) + 1); 942 943 if (new == NULL) { 944 reply(421, "Ran out of memory."); 945 dologout(1); 946 /* NOTREACHED */ 947 } 948 (void) strcpy(new, s); 949 return (new); 950} 951 952/* 953 * Save the result of a getpwnam. Used for USER command, since 954 * the data returned must not be clobbered by any other command 955 * (e.g., globbing). 956 * NB: The data returned by sgetpwnam() will remain valid until 957 * the next call to this function. Its difference from getpwnam() 958 * is that sgetpwnam() is known to be called from ftpd code only. 959 */ 960static struct passwd * 961sgetpwnam(char *name) 962{ 963 static struct passwd save; 964 struct passwd *p; 965 966 if ((p = getpwnam(name)) == NULL) 967 return (p); 968 if (save.pw_name) { 969 free(save.pw_name); 970 free(save.pw_passwd); 971 free(save.pw_class); 972 free(save.pw_gecos); 973 free(save.pw_dir); 974 free(save.pw_shell); 975 } 976 save = *p; 977 save.pw_name = sgetsave(p->pw_name); 978 save.pw_passwd = sgetsave(p->pw_passwd); 979 save.pw_class = sgetsave(p->pw_class); 980 save.pw_gecos = sgetsave(p->pw_gecos); 981 save.pw_dir = sgetsave(p->pw_dir); 982 save.pw_shell = sgetsave(p->pw_shell); 983 return (&save); 984} 985 986static int login_attempts; /* number of failed login attempts */ 987static int askpasswd; /* had user command, ask for passwd */ 988static char curname[MAXLOGNAME]; /* current USER name */ 989 990/* 991 * USER command. 992 * Sets global passwd pointer pw if named account exists and is acceptable; 993 * sets askpasswd if a PASS command is expected. If logged in previously, 994 * need to reset state. If name is "ftp" or "anonymous", the name is not in 995 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 996 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 997 * requesting login privileges. Disallow anyone who does not have a standard 998 * shell as returned by getusershell(). Disallow anyone mentioned in the file 999 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 1000 */ 1001void 1002user(char *name) 1003{ 1004 int ecode; 1005 char *cp, *shell; 1006 1007 if (logged_in) { 1008 if (guest) { 1009 reply(530, "Can't change user from guest login."); 1010 return; 1011 } else if (dochroot) { 1012 reply(530, "Can't change user from chroot user."); 1013 return; 1014 } 1015 end_login(); 1016 } 1017 1018 guest = 0; 1019#ifdef VIRTUAL_HOSTING 1020 pw = sgetpwnam(thishost->anonuser); 1021#else 1022 pw = sgetpwnam("ftp"); 1023#endif 1024 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1025 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL, &ecode) || 1026 (ecode != 0 && ecode != ENOENT)) 1027 reply(530, "User %s access denied.", name); 1028 else if (checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL, &ecode) || 1029 (ecode != 0 && ecode != ENOENT)) 1030 reply(530, "User %s access denied.", name); 1031 else if (pw != NULL) { 1032 guest = 1; 1033 askpasswd = 1; 1034 reply(331, 1035 "Guest login ok, send your email address as password."); 1036 } else 1037 reply(530, "User %s unknown.", name); 1038 if (!askpasswd && logging) 1039 syslog(LOG_NOTICE, 1040 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1041 return; 1042 } 1043 if (anon_only != 0) { 1044 reply(530, "Sorry, only anonymous ftp allowed."); 1045 return; 1046 } 1047 1048 if ((pw = sgetpwnam(name))) { 1049 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1050 shell = _PATH_BSHELL; 1051 setusershell(); 1052 while ((cp = getusershell()) != NULL) 1053 if (strcmp(cp, shell) == 0) 1054 break; 1055 endusershell(); 1056 1057 if (cp == NULL || 1058 (checkuser(_PATH_FTPUSERS, name, 1, NULL, &ecode) || 1059 (ecode != 0 && ecode != ENOENT))) { 1060 reply(530, "User %s access denied.", name); 1061 if (logging) 1062 syslog(LOG_NOTICE, 1063 "FTP LOGIN REFUSED FROM %s, %s", 1064 remotehost, name); 1065 pw = NULL; 1066 return; 1067 } 1068 } 1069 if (logging) 1070 strncpy(curname, name, sizeof(curname)-1); 1071 1072 pwok = 0; 1073#ifdef USE_PAM 1074 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1075#endif 1076 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1077 pwok = (pw != NULL) && 1078 opieaccessfile(remotehost) && 1079 opiealways(pw->pw_dir); 1080 reply(331, "Response to %s %s for %s.", 1081 opieprompt, pwok ? "requested" : "required", name); 1082 } else { 1083 pwok = 1; 1084 reply(331, "Password required for %s.", name); 1085 } 1086 askpasswd = 1; 1087 /* 1088 * Delay before reading passwd after first failed 1089 * attempt to slow down passwd-guessing programs. 1090 */ 1091 if (login_attempts) 1092 sleep(login_attempts); 1093} 1094 1095/* 1096 * Check if a user is in the file "fname", 1097 * return a pointer to a malloc'd string with the rest 1098 * of the matching line in "residue" if not NULL. 1099 */ 1100static int 1101checkuser(char *fname, char *name, int pwset, char **residue, int *ecode) 1102{ 1103 FILE *fd; 1104 int found = 0; 1105 size_t len; 1106 char *line, *mp, *p; 1107 1108 if (ecode != NULL) 1109 *ecode = 0; 1110 if ((fd = fopen(fname, "r")) != NULL) { 1111 while (!found && (line = fgetln(fd, &len)) != NULL) { 1112 /* skip comments */ 1113 if (line[0] == '#') 1114 continue; 1115 if (line[len - 1] == '\n') { 1116 line[len - 1] = '\0'; 1117 mp = NULL; 1118 } else { 1119 if ((mp = malloc(len + 1)) == NULL) 1120 fatalerror("Ran out of memory."); 1121 memcpy(mp, line, len); 1122 mp[len] = '\0'; 1123 line = mp; 1124 } 1125 /* avoid possible leading and trailing whitespace */ 1126 p = strtok(line, " \t"); 1127 /* skip empty lines */ 1128 if (p == NULL) 1129 goto nextline; 1130 /* 1131 * if first chr is '@', check group membership 1132 */ 1133 if (p[0] == '@') { 1134 int i = 0; 1135 struct group *grp; 1136 1137 if (p[1] == '\0') /* single @ matches anyone */ 1138 found = 1; 1139 else { 1140 if ((grp = getgrnam(p+1)) == NULL) 1141 goto nextline; 1142 /* 1143 * Check user's default group 1144 */ 1145 if (pwset && grp->gr_gid == pw->pw_gid) 1146 found = 1; 1147 /* 1148 * Check supplementary groups 1149 */ 1150 while (!found && grp->gr_mem[i]) 1151 found = strcmp(name, 1152 grp->gr_mem[i++]) 1153 == 0; 1154 } 1155 } 1156 /* 1157 * Otherwise, just check for username match 1158 */ 1159 else 1160 found = strcmp(p, name) == 0; 1161 /* 1162 * Save the rest of line to "residue" if matched 1163 */ 1164 if (found && residue) { 1165 if ((p = strtok(NULL, "")) != NULL) 1166 p += strspn(p, " \t"); 1167 if (p && *p) { 1168 if ((*residue = strdup(p)) == NULL) 1169 fatalerror("Ran out of memory."); 1170 } else 1171 *residue = NULL; 1172 } 1173nextline: 1174 if (mp) 1175 free(mp); 1176 } 1177 (void) fclose(fd); 1178 } else if (ecode != NULL) 1179 *ecode = errno; 1180 return (found); 1181} 1182 1183/* 1184 * Terminate login as previous user, if any, resetting state; 1185 * used when USER command is given or login fails. 1186 */ 1187static void 1188end_login(void) 1189{ 1190#ifdef USE_PAM 1191 int e; 1192#endif 1193 1194 (void) seteuid(0); 1195 if (logged_in && dowtmp) 1196 ftpd_logwtmp(wtmpid, NULL, NULL); 1197 pw = NULL; 1198#ifdef LOGIN_CAP 1199 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 1200 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 1201 LOGIN_SETENV)); 1202#endif 1203#ifdef USE_PAM 1204 if (pamh) { 1205 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1206 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1207 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1208 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1209 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1210 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1211 pamh = NULL; 1212 } 1213#endif 1214 logged_in = 0; 1215 guest = 0; 1216 dochroot = 0; 1217} 1218 1219#ifdef USE_PAM 1220 1221/* 1222 * the following code is stolen from imap-uw PAM authentication module and 1223 * login.c 1224 */ 1225#define COPY_STRING(s) (s ? strdup(s) : NULL) 1226 1227struct cred_t { 1228 const char *uname; /* user name */ 1229 const char *pass; /* password */ 1230}; 1231typedef struct cred_t cred_t; 1232 1233static int 1234auth_conv(int num_msg, const struct pam_message **msg, 1235 struct pam_response **resp, void *appdata) 1236{ 1237 int i; 1238 cred_t *cred = (cred_t *) appdata; 1239 struct pam_response *reply; 1240 1241 reply = calloc(num_msg, sizeof *reply); 1242 if (reply == NULL) 1243 return PAM_BUF_ERR; 1244 1245 for (i = 0; i < num_msg; i++) { 1246 switch (msg[i]->msg_style) { 1247 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1248 reply[i].resp_retcode = PAM_SUCCESS; 1249 reply[i].resp = COPY_STRING(cred->uname); 1250 /* PAM frees resp. */ 1251 break; 1252 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1253 reply[i].resp_retcode = PAM_SUCCESS; 1254 reply[i].resp = COPY_STRING(cred->pass); 1255 /* PAM frees resp. */ 1256 break; 1257 case PAM_TEXT_INFO: 1258 case PAM_ERROR_MSG: 1259 reply[i].resp_retcode = PAM_SUCCESS; 1260 reply[i].resp = NULL; 1261 break; 1262 default: /* unknown message style */ 1263 free(reply); 1264 return PAM_CONV_ERR; 1265 } 1266 } 1267 1268 *resp = reply; 1269 return PAM_SUCCESS; 1270} 1271 1272/* 1273 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1274 * authenticated, or 1 if not authenticated. If some sort of PAM system 1275 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1276 * function returns -1. This can be used as an indication that we should 1277 * fall back to a different authentication mechanism. 1278 */ 1279static int 1280auth_pam(struct passwd **ppw, const char *pass) 1281{ 1282 const char *tmpl_user; 1283 const void *item; 1284 int rval; 1285 int e; 1286 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1287 struct pam_conv conv = { &auth_conv, &auth_cred }; 1288 1289 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1290 if (e != PAM_SUCCESS) { 1291 /* 1292 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1293 * if context creation has failed in the first place. 1294 */ 1295 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1296 return -1; 1297 } 1298 1299 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1300 if (e != PAM_SUCCESS) { 1301 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1302 pam_strerror(pamh, e)); 1303 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1304 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1305 } 1306 pamh = NULL; 1307 return -1; 1308 } 1309 1310 e = pam_authenticate(pamh, 0); 1311 switch (e) { 1312 case PAM_SUCCESS: 1313 /* 1314 * With PAM we support the concept of a "template" 1315 * user. The user enters a login name which is 1316 * authenticated by PAM, usually via a remote service 1317 * such as RADIUS or TACACS+. If authentication 1318 * succeeds, a different but related "template" name 1319 * is used for setting the credentials, shell, and 1320 * home directory. The name the user enters need only 1321 * exist on the remote authentication server, but the 1322 * template name must be present in the local password 1323 * database. 1324 * 1325 * This is supported by two various mechanisms in the 1326 * individual modules. However, from the application's 1327 * point of view, the template user is always passed 1328 * back as a changed value of the PAM_USER item. 1329 */ 1330 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1331 PAM_SUCCESS) { 1332 tmpl_user = (const char *) item; 1333 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1334 *ppw = getpwnam(tmpl_user); 1335 } else 1336 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1337 pam_strerror(pamh, e)); 1338 rval = 0; 1339 break; 1340 1341 case PAM_AUTH_ERR: 1342 case PAM_USER_UNKNOWN: 1343 case PAM_MAXTRIES: 1344 rval = 1; 1345 break; 1346 1347 default: 1348 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1349 rval = -1; 1350 break; 1351 } 1352 1353 if (rval == 0) { 1354 e = pam_acct_mgmt(pamh, 0); 1355 if (e != PAM_SUCCESS) { 1356 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1357 pam_strerror(pamh, e)); 1358 rval = 1; 1359 } 1360 } 1361 1362 if (rval != 0) { 1363 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1364 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1365 } 1366 pamh = NULL; 1367 } 1368 return rval; 1369} 1370 1371#endif /* USE_PAM */ 1372 1373void 1374pass(char *passwd) 1375{ 1376 int rval, ecode; 1377 FILE *fd; 1378#ifdef LOGIN_CAP 1379 login_cap_t *lc = NULL; 1380#endif 1381#ifdef USE_PAM 1382 int e; 1383#endif 1384 char *residue = NULL; 1385 char *xpasswd; 1386 1387 if (logged_in || askpasswd == 0) { 1388 reply(503, "Login with USER first."); 1389 return; 1390 } 1391 askpasswd = 0; 1392 if (!guest) { /* "ftp" is only account allowed no password */ 1393 if (pw == NULL) { 1394 rval = 1; /* failure below */ 1395 goto skip; 1396 } 1397#ifdef USE_PAM 1398 rval = auth_pam(&pw, passwd); 1399 if (rval >= 0) { 1400 opieunlock(); 1401 goto skip; 1402 } 1403#endif 1404 if (opieverify(&opiedata, passwd) == 0) 1405 xpasswd = pw->pw_passwd; 1406 else if (pwok) { 1407 xpasswd = crypt(passwd, pw->pw_passwd); 1408 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1409 xpasswd = ":"; 1410 } else { 1411 rval = 1; 1412 goto skip; 1413 } 1414 rval = strcmp(pw->pw_passwd, xpasswd); 1415 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1416 rval = 1; /* failure */ 1417skip: 1418 /* 1419 * If rval == 1, the user failed the authentication check 1420 * above. If rval == 0, either PAM or local authentication 1421 * succeeded. 1422 */ 1423 if (rval) { 1424 reply(530, "Login incorrect."); 1425#ifdef USE_BLACKLIST 1426 blacklist_notify(1, STDIN_FILENO, "Login incorrect"); 1427#endif 1428 if (logging) { 1429 syslog(LOG_NOTICE, 1430 "FTP LOGIN FAILED FROM %s", 1431 remotehost); 1432 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1433 "FTP LOGIN FAILED FROM %s, %s", 1434 remotehost, curname); 1435 } 1436 pw = NULL; 1437 if (login_attempts++ >= 5) { 1438 syslog(LOG_NOTICE, 1439 "repeated login failures from %s", 1440 remotehost); 1441 exit(0); 1442 } 1443 return; 1444 } 1445#ifdef USE_BLACKLIST 1446 else { 1447 blacklist_notify(0, STDIN_FILENO, "Login successful"); 1448 } 1449#endif 1450 } 1451 login_attempts = 0; /* this time successful */ 1452 if (setegid(pw->pw_gid) < 0) { 1453 reply(550, "Can't set gid."); 1454 return; 1455 } 1456 /* May be overridden by login.conf */ 1457 (void) umask(defumask); 1458#ifdef LOGIN_CAP 1459 if ((lc = login_getpwclass(pw)) != NULL) { 1460 char remote_ip[NI_MAXHOST]; 1461 1462 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1463 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1464 NI_NUMERICHOST)) 1465 *remote_ip = 0; 1466 remote_ip[sizeof(remote_ip) - 1] = 0; 1467 if (!auth_hostok(lc, remotehost, remote_ip)) { 1468 syslog(LOG_INFO|LOG_AUTH, 1469 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1470 pw->pw_name); 1471 reply(530, "Permission denied."); 1472 pw = NULL; 1473 return; 1474 } 1475 if (!auth_timeok(lc, time(NULL))) { 1476 reply(530, "Login not available right now."); 1477 pw = NULL; 1478 return; 1479 } 1480 } 1481 setusercontext(lc, pw, 0, LOGIN_SETALL & 1482 ~(LOGIN_SETUSER | LOGIN_SETPATH | LOGIN_SETENV)); 1483#else 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 dochroot = 1499 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue, &ecode) 1500#ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1501 || login_getcapbool(lc, "ftp-chroot", 0) 1502#endif 1503 ; 1504 /* 1505 * It is possible that checkuser() failed to open the chroot file. 1506 * If this is the case, report that logins are un-available, since we 1507 * have no way of checking whether or not the user should be chrooted. 1508 * We ignore ENOENT since it is not required that this file be present. 1509 */ 1510 if (ecode != 0 && ecode != ENOENT) { 1511 reply(530, "Login not available right now."); 1512 return; 1513 } 1514 chrootdir = NULL; 1515 1516 /* Disable wtmp logging when chrooting. */ 1517 if (dochroot || guest) 1518 dowtmp = 0; 1519 if (dowtmp) 1520 ftpd_logwtmp(wtmpid, pw->pw_name, 1521 (struct sockaddr *)&his_addr); 1522 logged_in = 1; 1523 1524 if (guest && stats && statfd < 0) 1525#ifdef VIRTUAL_HOSTING 1526 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1527#else 1528 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1529#endif 1530 if (statfd < 0) 1531 stats = 0; 1532 1533 /* 1534 * For a chrooted local user, 1535 * a) see whether ftpchroot(5) specifies a chroot directory, 1536 * b) extract the directory pathname from the line, 1537 * c) expand it to the absolute pathname if necessary. 1538 */ 1539 if (dochroot && residue && 1540 (chrootdir = strtok(residue, " \t")) != NULL) { 1541 if (chrootdir[0] != '/') 1542 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1543 else 1544 chrootdir = strdup(chrootdir); /* make it permanent */ 1545 if (chrootdir == NULL) 1546 fatalerror("Ran out of memory."); 1547 } 1548 if (guest || dochroot) { 1549 /* 1550 * If no chroot directory set yet, use the login directory. 1551 * Copy it so it can be modified while pw->pw_dir stays intact. 1552 */ 1553 if (chrootdir == NULL && 1554 (chrootdir = strdup(pw->pw_dir)) == NULL) 1555 fatalerror("Ran out of memory."); 1556 /* 1557 * Check for the "/chroot/./home" syntax, 1558 * separate the chroot and home directory pathnames. 1559 */ 1560 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1561 *(homedir++) = '\0'; /* wipe '/' */ 1562 homedir++; /* skip '.' */ 1563 } else { 1564 /* 1565 * We MUST do a chdir() after the chroot. Otherwise 1566 * the old current directory will be accessible as "." 1567 * outside the new root! 1568 */ 1569 homedir = "/"; 1570 } 1571 /* 1572 * Finally, do chroot() 1573 */ 1574 if (chroot(chrootdir) < 0) { 1575 reply(550, "Can't change root."); 1576 goto bad; 1577 } 1578 __FreeBSD_libc_enter_restricted_mode(); 1579 } else /* real user w/o chroot */ 1580 homedir = pw->pw_dir; 1581 /* 1582 * Set euid *before* doing chdir() so 1583 * a) the user won't be carried to a directory that he couldn't reach 1584 * on his own due to no permission to upper path components, 1585 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1586 * (uid 0 has no root power over NFS if not mapped explicitly.) 1587 */ 1588 if (seteuid(pw->pw_uid) < 0) { 1589 reply(550, "Can't set uid."); 1590 goto bad; 1591 } 1592 if (chdir(homedir) < 0) { 1593 if (guest || dochroot) { 1594 reply(550, "Can't change to base directory."); 1595 goto bad; 1596 } else { 1597 if (chdir("/") < 0) { 1598 reply(550, "Root is inaccessible."); 1599 goto bad; 1600 } 1601 lreply(230, "No directory! Logging in with home=/."); 1602 } 1603 } 1604 1605 /* 1606 * Display a login message, if it exists. 1607 * N.B. reply(230,) must follow the message. 1608 */ 1609#ifdef VIRTUAL_HOSTING 1610 fd = fopen(thishost->loginmsg, "r"); 1611#else 1612 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1613#endif 1614 if (fd != NULL) { 1615 char *cp, line[LINE_MAX]; 1616 1617 while (fgets(line, sizeof(line), fd) != NULL) { 1618 if ((cp = strchr(line, '\n')) != NULL) 1619 *cp = '\0'; 1620 lreply(230, "%s", line); 1621 } 1622 (void) fflush(stdout); 1623 (void) fclose(fd); 1624 } 1625 if (guest) { 1626 if (ident != NULL) 1627 free(ident); 1628 ident = strdup(passwd); 1629 if (ident == NULL) 1630 fatalerror("Ran out of memory."); 1631 1632 reply(230, "Guest login ok, access restrictions apply."); 1633#ifdef SETPROCTITLE 1634#ifdef VIRTUAL_HOSTING 1635 if (thishost != firsthost) 1636 snprintf(proctitle, sizeof(proctitle), 1637 "%s: anonymous(%s)/%s", remotehost, hostname, 1638 passwd); 1639 else 1640#endif 1641 snprintf(proctitle, sizeof(proctitle), 1642 "%s: anonymous/%s", remotehost, passwd); 1643 setproctitle("%s", proctitle); 1644#endif /* SETPROCTITLE */ 1645 if (logging) 1646 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1647 remotehost, passwd); 1648 } else { 1649 if (dochroot) 1650 reply(230, "User %s logged in, " 1651 "access restrictions apply.", pw->pw_name); 1652 else 1653 reply(230, "User %s logged in.", pw->pw_name); 1654 1655#ifdef SETPROCTITLE 1656 snprintf(proctitle, sizeof(proctitle), 1657 "%s: user/%s", remotehost, pw->pw_name); 1658 setproctitle("%s", proctitle); 1659#endif /* SETPROCTITLE */ 1660 if (logging) 1661 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1662 remotehost, pw->pw_name); 1663 } 1664 if (logging && (guest || dochroot)) 1665 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1666#ifdef LOGIN_CAP 1667 login_close(lc); 1668#endif 1669 if (residue) 1670 free(residue); 1671 return; 1672bad: 1673 /* Forget all about it... */ 1674#ifdef LOGIN_CAP 1675 login_close(lc); 1676#endif 1677 if (residue) 1678 free(residue); 1679 end_login(); 1680} 1681 1682void 1683retrieve(char *cmd, char *name) 1684{ 1685 FILE *fin, *dout; 1686 struct stat st; 1687 int (*closefunc)(FILE *); 1688 time_t start; 1689 char line[BUFSIZ]; 1690 1691 if (cmd == 0) { 1692 fin = fopen(name, "r"), closefunc = fclose; 1693 st.st_size = 0; 1694 } else { 1695 (void) snprintf(line, sizeof(line), cmd, name); 1696 name = line; 1697 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1698 st.st_size = -1; 1699 st.st_blksize = BUFSIZ; 1700 } 1701 if (fin == NULL) { 1702 if (errno != 0) { 1703 perror_reply(550, name); 1704 if (cmd == 0) { 1705 LOGCMD("get", name); 1706 } 1707 } 1708 return; 1709 } 1710 byte_count = -1; 1711 if (cmd == 0) { 1712 if (fstat(fileno(fin), &st) < 0) { 1713 perror_reply(550, name); 1714 goto done; 1715 } 1716 if (!S_ISREG(st.st_mode)) { 1717 /* 1718 * Never sending a raw directory is a workaround 1719 * for buggy clients that will attempt to RETR 1720 * a directory before listing it, e.g., Mozilla. 1721 * Preventing a guest from getting irregular files 1722 * is a simple security measure. 1723 */ 1724 if (S_ISDIR(st.st_mode) || guest) { 1725 reply(550, "%s: not a plain file.", name); 1726 goto done; 1727 } 1728 st.st_size = -1; 1729 /* st.st_blksize is set for all descriptor types */ 1730 } 1731 } 1732 if (restart_point) { 1733 if (type == TYPE_A) { 1734 off_t i, n; 1735 int c; 1736 1737 n = restart_point; 1738 i = 0; 1739 while (i++ < n) { 1740 if ((c=getc(fin)) == EOF) { 1741 perror_reply(550, name); 1742 goto done; 1743 } 1744 if (c == '\n') 1745 i++; 1746 } 1747 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1748 perror_reply(550, name); 1749 goto done; 1750 } 1751 } 1752 dout = dataconn(name, st.st_size, "w"); 1753 if (dout == NULL) 1754 goto done; 1755 time(&start); 1756 send_data(fin, dout, st.st_blksize, st.st_size, 1757 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1758 if (cmd == 0 && guest && stats && byte_count > 0) 1759 logxfer(name, byte_count, start); 1760 (void) fclose(dout); 1761 data = -1; 1762 pdata = -1; 1763done: 1764 if (cmd == 0) 1765 LOGBYTES("get", name, byte_count); 1766 (*closefunc)(fin); 1767} 1768 1769void 1770store(char *name, char *mode, int unique) 1771{ 1772 int fd; 1773 FILE *fout, *din; 1774 int (*closefunc)(FILE *); 1775 1776 if (*mode == 'a') { /* APPE */ 1777 if (unique) { 1778 /* Programming error */ 1779 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1780 unique = 0; 1781 } 1782 if (guest && noguestmod) { 1783 reply(550, "Appending to existing file denied."); 1784 goto err; 1785 } 1786 restart_point = 0; /* not affected by preceding REST */ 1787 } 1788 if (unique) /* STOU overrides REST */ 1789 restart_point = 0; 1790 if (guest && noguestmod) { 1791 if (restart_point) { /* guest STOR w/REST */ 1792 reply(550, "Modifying existing file denied."); 1793 goto err; 1794 } else /* treat guest STOR as STOU */ 1795 unique = 1; 1796 } 1797 1798 if (restart_point) 1799 mode = "r+"; /* so ASCII manual seek can work */ 1800 if (unique) { 1801 if ((fd = guniquefd(name, &name)) < 0) 1802 goto err; 1803 fout = fdopen(fd, mode); 1804 } else 1805 fout = fopen(name, mode); 1806 closefunc = fclose; 1807 if (fout == NULL) { 1808 perror_reply(553, name); 1809 goto err; 1810 } 1811 byte_count = -1; 1812 if (restart_point) { 1813 if (type == TYPE_A) { 1814 off_t i, n; 1815 int c; 1816 1817 n = restart_point; 1818 i = 0; 1819 while (i++ < n) { 1820 if ((c=getc(fout)) == EOF) { 1821 perror_reply(550, name); 1822 goto done; 1823 } 1824 if (c == '\n') 1825 i++; 1826 } 1827 /* 1828 * We must do this seek to "current" position 1829 * because we are changing from reading to 1830 * writing. 1831 */ 1832 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1833 perror_reply(550, name); 1834 goto done; 1835 } 1836 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1837 perror_reply(550, name); 1838 goto done; 1839 } 1840 } 1841 din = dataconn(name, -1, "r"); 1842 if (din == NULL) 1843 goto done; 1844 if (receive_data(din, fout) == 0) { 1845 if (unique) 1846 reply(226, "Transfer complete (unique file name:%s).", 1847 name); 1848 else 1849 reply(226, "Transfer complete."); 1850 } 1851 (void) fclose(din); 1852 data = -1; 1853 pdata = -1; 1854done: 1855 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1856 (*closefunc)(fout); 1857 return; 1858err: 1859 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1860 return; 1861} 1862 1863static FILE * 1864getdatasock(char *mode) 1865{ 1866 int on = 1, s, t, tries; 1867 1868 if (data >= 0) 1869 return (fdopen(data, mode)); 1870 1871 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1872 if (s < 0) 1873 goto bad; 1874 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1875 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1876 /* anchor socket to avoid multi-homing problems */ 1877 data_source = ctrl_addr; 1878 data_source.su_port = htons(dataport); 1879 (void) seteuid(0); 1880 for (tries = 1; ; tries++) { 1881 /* 1882 * We should loop here since it's possible that 1883 * another ftpd instance has passed this point and is 1884 * trying to open a data connection in active mode now. 1885 * Until the other connection is opened, we'll be getting 1886 * EADDRINUSE because no SOCK_STREAM sockets in the system 1887 * can share both local and remote addresses, localIP:20 1888 * and *:* in this case. 1889 */ 1890 if (bind(s, (struct sockaddr *)&data_source, 1891 data_source.su_len) >= 0) 1892 break; 1893 if (errno != EADDRINUSE || tries > 10) 1894 goto bad; 1895 sleep(tries); 1896 } 1897 (void) seteuid(pw->pw_uid); 1898#ifdef IP_TOS 1899 if (data_source.su_family == AF_INET) 1900 { 1901 on = IPTOS_THROUGHPUT; 1902 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1903 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1904 } 1905#endif 1906#ifdef TCP_NOPUSH 1907 /* 1908 * Turn off push flag to keep sender TCP from sending short packets 1909 * at the boundaries of each write(). 1910 */ 1911 on = 1; 1912 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1913 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1914#endif 1915 return (fdopen(s, mode)); 1916bad: 1917 /* Return the real value of errno (close may change it) */ 1918 t = errno; 1919 (void) seteuid(pw->pw_uid); 1920 (void) close(s); 1921 errno = t; 1922 return (NULL); 1923} 1924 1925static FILE * 1926dataconn(char *name, off_t size, char *mode) 1927{ 1928 char sizebuf[32]; 1929 FILE *file; 1930 int retry = 0, tos, conerrno; 1931 1932 file_size = size; 1933 byte_count = 0; 1934 if (size != -1) 1935 (void) snprintf(sizebuf, sizeof(sizebuf), 1936 " (%jd bytes)", (intmax_t)size); 1937 else 1938 *sizebuf = '\0'; 1939 if (pdata >= 0) { 1940 union sockunion from; 1941 socklen_t fromlen = ctrl_addr.su_len; 1942 int flags, s; 1943 struct timeval timeout; 1944 fd_set set; 1945 1946 FD_ZERO(&set); 1947 FD_SET(pdata, &set); 1948 1949 timeout.tv_usec = 0; 1950 timeout.tv_sec = 120; 1951 1952 /* 1953 * Granted a socket is in the blocking I/O mode, 1954 * accept() will block after a successful select() 1955 * if the selected connection dies in between. 1956 * Therefore set the non-blocking I/O flag here. 1957 */ 1958 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1959 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1960 goto pdata_err; 1961 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1962 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1963 goto pdata_err; 1964 (void) close(pdata); 1965 pdata = s; 1966 /* 1967 * Unset the inherited non-blocking I/O flag 1968 * on the child socket so stdio can work on it. 1969 */ 1970 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1971 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1972 goto pdata_err; 1973#ifdef IP_TOS 1974 if (from.su_family == AF_INET) 1975 { 1976 tos = IPTOS_THROUGHPUT; 1977 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1978 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1979 } 1980#endif 1981 reply(150, "Opening %s mode data connection for '%s'%s.", 1982 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1983 return (fdopen(pdata, mode)); 1984pdata_err: 1985 reply(425, "Can't open data connection."); 1986 (void) close(pdata); 1987 pdata = -1; 1988 return (NULL); 1989 } 1990 if (data >= 0) { 1991 reply(125, "Using existing data connection for '%s'%s.", 1992 name, sizebuf); 1993 usedefault = 1; 1994 return (fdopen(data, mode)); 1995 } 1996 if (usedefault) 1997 data_dest = his_addr; 1998 usedefault = 1; 1999 do { 2000 file = getdatasock(mode); 2001 if (file == NULL) { 2002 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 2003 2004 if (getnameinfo((struct sockaddr *)&data_source, 2005 data_source.su_len, 2006 hostbuf, sizeof(hostbuf) - 1, 2007 portbuf, sizeof(portbuf) - 1, 2008 NI_NUMERICHOST|NI_NUMERICSERV)) 2009 *hostbuf = *portbuf = 0; 2010 hostbuf[sizeof(hostbuf) - 1] = 0; 2011 portbuf[sizeof(portbuf) - 1] = 0; 2012 reply(425, "Can't create data socket (%s,%s): %s.", 2013 hostbuf, portbuf, strerror(errno)); 2014 return (NULL); 2015 } 2016 data = fileno(file); 2017 conerrno = 0; 2018 if (connect(data, (struct sockaddr *)&data_dest, 2019 data_dest.su_len) == 0) 2020 break; 2021 conerrno = errno; 2022 (void) fclose(file); 2023 data = -1; 2024 if (conerrno == EADDRINUSE) { 2025 sleep(swaitint); 2026 retry += swaitint; 2027 } else { 2028 break; 2029 } 2030 } while (retry <= swaitmax); 2031 if (conerrno != 0) { 2032 reply(425, "Can't build data connection: %s.", 2033 strerror(conerrno)); 2034 return (NULL); 2035 } 2036 reply(150, "Opening %s mode data connection for '%s'%s.", 2037 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2038 return (file); 2039} 2040 2041/* 2042 * A helper macro to avoid code duplication 2043 * in send_data() and receive_data(). 2044 * 2045 * XXX We have to block SIGURG during putc() because BSD stdio 2046 * is unable to restart interrupted write operations and hence 2047 * the entire buffer contents will be lost as soon as a write() 2048 * call indicates EINTR to stdio. 2049 */ 2050#define FTPD_PUTC(ch, file, label) \ 2051 do { \ 2052 int ret; \ 2053 \ 2054 do { \ 2055 START_UNSAFE; \ 2056 ret = putc((ch), (file)); \ 2057 END_UNSAFE; \ 2058 CHECKOOB(return (-1)) \ 2059 else if (ferror(file)) \ 2060 goto label; \ 2061 clearerr(file); \ 2062 } while (ret == EOF); \ 2063 } while (0) 2064 2065/* 2066 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2067 * encapsulation of the data subject to Mode, Structure, and Type. 2068 * 2069 * NB: Form isn't handled. 2070 */ 2071static int 2072send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2073{ 2074 int c, cp, filefd, netfd; 2075 char *buf; 2076 2077 STARTXFER; 2078 2079 switch (type) { 2080 2081 case TYPE_A: 2082 cp = EOF; 2083 for (;;) { 2084 c = getc(instr); 2085 CHECKOOB(return (-1)) 2086 else if (c == EOF && ferror(instr)) 2087 goto file_err; 2088 if (c == EOF) { 2089 if (ferror(instr)) { /* resume after OOB */ 2090 clearerr(instr); 2091 continue; 2092 } 2093 if (feof(instr)) /* EOF */ 2094 break; 2095 syslog(LOG_ERR, "Internal: impossible condition" 2096 " on file after getc()"); 2097 goto file_err; 2098 } 2099 if (c == '\n' && cp != '\r') { 2100 FTPD_PUTC('\r', outstr, data_err); 2101 byte_count++; 2102 } 2103 FTPD_PUTC(c, outstr, data_err); 2104 byte_count++; 2105 cp = c; 2106 } 2107#ifdef notyet /* BSD stdio isn't ready for that */ 2108 while (fflush(outstr) == EOF) { 2109 CHECKOOB(return (-1)) 2110 else 2111 goto data_err; 2112 clearerr(outstr); 2113 } 2114 ENDXFER; 2115#else 2116 ENDXFER; 2117 if (fflush(outstr) == EOF) 2118 goto data_err; 2119#endif 2120 reply(226, "Transfer complete."); 2121 return (0); 2122 2123 case TYPE_I: 2124 case TYPE_L: 2125 /* 2126 * isreg is only set if we are not doing restart and we 2127 * are sending a regular file 2128 */ 2129 netfd = fileno(outstr); 2130 filefd = fileno(instr); 2131 2132 if (isreg) { 2133 char *msg = "Transfer complete."; 2134 off_t cnt, offset; 2135 int err; 2136 2137 cnt = offset = 0; 2138 2139 while (filesize > 0) { 2140 err = sendfile(filefd, netfd, offset, 0, 2141 NULL, &cnt, 0); 2142 /* 2143 * Calculate byte_count before OOB processing. 2144 * It can be used in myoob() later. 2145 */ 2146 byte_count += cnt; 2147 offset += cnt; 2148 filesize -= cnt; 2149 CHECKOOB(return (-1)) 2150 else if (err == -1) { 2151 if (errno != EINTR && 2152 cnt == 0 && offset == 0) 2153 goto oldway; 2154 goto data_err; 2155 } 2156 if (err == -1) /* resume after OOB */ 2157 continue; 2158 /* 2159 * We hit the EOF prematurely. 2160 * Perhaps the file was externally truncated. 2161 */ 2162 if (cnt == 0) { 2163 msg = "Transfer finished due to " 2164 "premature end of file."; 2165 break; 2166 } 2167 } 2168 ENDXFER; 2169 reply(226, "%s", msg); 2170 return (0); 2171 } 2172 2173oldway: 2174 if ((buf = malloc(blksize)) == NULL) { 2175 ENDXFER; 2176 reply(451, "Ran out of memory."); 2177 return (-1); 2178 } 2179 2180 for (;;) { 2181 int cnt, len; 2182 char *bp; 2183 2184 cnt = read(filefd, buf, blksize); 2185 CHECKOOB(free(buf); return (-1)) 2186 else if (cnt < 0) { 2187 free(buf); 2188 goto file_err; 2189 } 2190 if (cnt < 0) /* resume after OOB */ 2191 continue; 2192 if (cnt == 0) /* EOF */ 2193 break; 2194 for (len = cnt, bp = buf; len > 0;) { 2195 cnt = write(netfd, bp, len); 2196 CHECKOOB(free(buf); return (-1)) 2197 else if (cnt < 0) { 2198 free(buf); 2199 goto data_err; 2200 } 2201 if (cnt <= 0) 2202 continue; 2203 len -= cnt; 2204 bp += cnt; 2205 byte_count += cnt; 2206 } 2207 } 2208 ENDXFER; 2209 free(buf); 2210 reply(226, "Transfer complete."); 2211 return (0); 2212 default: 2213 ENDXFER; 2214 reply(550, "Unimplemented TYPE %d in send_data.", type); 2215 return (-1); 2216 } 2217 2218data_err: 2219 ENDXFER; 2220 perror_reply(426, "Data connection"); 2221 return (-1); 2222 2223file_err: 2224 ENDXFER; 2225 perror_reply(551, "Error on input file"); 2226 return (-1); 2227} 2228 2229/* 2230 * Transfer data from peer to "outstr" using the appropriate encapulation of 2231 * the data subject to Mode, Structure, and Type. 2232 * 2233 * N.B.: Form isn't handled. 2234 */ 2235static int 2236receive_data(FILE *instr, FILE *outstr) 2237{ 2238 int c, cp; 2239 int bare_lfs = 0; 2240 2241 STARTXFER; 2242 2243 switch (type) { 2244 2245 case TYPE_I: 2246 case TYPE_L: 2247 for (;;) { 2248 int cnt, len; 2249 char *bp; 2250 char buf[BUFSIZ]; 2251 2252 cnt = read(fileno(instr), buf, sizeof(buf)); 2253 CHECKOOB(return (-1)) 2254 else if (cnt < 0) 2255 goto data_err; 2256 if (cnt < 0) /* resume after OOB */ 2257 continue; 2258 if (cnt == 0) /* EOF */ 2259 break; 2260 for (len = cnt, bp = buf; len > 0;) { 2261 cnt = write(fileno(outstr), bp, len); 2262 CHECKOOB(return (-1)) 2263 else if (cnt < 0) 2264 goto file_err; 2265 if (cnt <= 0) 2266 continue; 2267 len -= cnt; 2268 bp += cnt; 2269 byte_count += cnt; 2270 } 2271 } 2272 ENDXFER; 2273 return (0); 2274 2275 case TYPE_E: 2276 ENDXFER; 2277 reply(553, "TYPE E not implemented."); 2278 return (-1); 2279 2280 case TYPE_A: 2281 cp = EOF; 2282 for (;;) { 2283 c = getc(instr); 2284 CHECKOOB(return (-1)) 2285 else if (c == EOF && ferror(instr)) 2286 goto data_err; 2287 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2288 clearerr(instr); 2289 continue; 2290 } 2291 2292 if (cp == '\r') { 2293 if (c != '\n') 2294 FTPD_PUTC('\r', outstr, file_err); 2295 } else 2296 if (c == '\n') 2297 bare_lfs++; 2298 if (c == '\r') { 2299 byte_count++; 2300 cp = c; 2301 continue; 2302 } 2303 2304 /* Check for EOF here in order not to lose last \r. */ 2305 if (c == EOF) { 2306 if (feof(instr)) /* EOF */ 2307 break; 2308 syslog(LOG_ERR, "Internal: impossible condition" 2309 " on data stream after getc()"); 2310 goto data_err; 2311 } 2312 2313 byte_count++; 2314 FTPD_PUTC(c, outstr, file_err); 2315 cp = c; 2316 } 2317#ifdef notyet /* BSD stdio isn't ready for that */ 2318 while (fflush(outstr) == EOF) { 2319 CHECKOOB(return (-1)) 2320 else 2321 goto file_err; 2322 clearerr(outstr); 2323 } 2324 ENDXFER; 2325#else 2326 ENDXFER; 2327 if (fflush(outstr) == EOF) 2328 goto file_err; 2329#endif 2330 if (bare_lfs) { 2331 lreply(226, 2332 "WARNING! %d bare linefeeds received in ASCII mode.", 2333 bare_lfs); 2334 (void)printf(" File may not have transferred correctly.\r\n"); 2335 } 2336 return (0); 2337 default: 2338 ENDXFER; 2339 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2340 return (-1); 2341 } 2342 2343data_err: 2344 ENDXFER; 2345 perror_reply(426, "Data connection"); 2346 return (-1); 2347 2348file_err: 2349 ENDXFER; 2350 perror_reply(452, "Error writing to file"); 2351 return (-1); 2352} 2353 2354void 2355statfilecmd(char *filename) 2356{ 2357 FILE *fin; 2358 int atstart; 2359 int c, code; 2360 char line[LINE_MAX]; 2361 struct stat st; 2362 2363 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2364 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2365 fin = ftpd_popen(line, "r"); 2366 if (fin == NULL) { 2367 perror_reply(551, filename); 2368 return; 2369 } 2370 lreply(code, "Status of %s:", filename); 2371 atstart = 1; 2372 while ((c = getc(fin)) != EOF) { 2373 if (c == '\n') { 2374 if (ferror(stdout)){ 2375 perror_reply(421, "Control connection"); 2376 (void) ftpd_pclose(fin); 2377 dologout(1); 2378 /* NOTREACHED */ 2379 } 2380 if (ferror(fin)) { 2381 perror_reply(551, filename); 2382 (void) ftpd_pclose(fin); 2383 return; 2384 } 2385 (void) putc('\r', stdout); 2386 } 2387 /* 2388 * RFC 959 says neutral text should be prepended before 2389 * a leading 3-digit number followed by whitespace, but 2390 * many ftp clients can be confused by any leading digits, 2391 * as a matter of fact. 2392 */ 2393 if (atstart && isdigit(c)) 2394 (void) putc(' ', stdout); 2395 (void) putc(c, stdout); 2396 atstart = (c == '\n'); 2397 } 2398 (void) ftpd_pclose(fin); 2399 reply(code, "End of status."); 2400} 2401 2402void 2403statcmd(void) 2404{ 2405 union sockunion *su; 2406 u_char *a, *p; 2407 char hname[NI_MAXHOST]; 2408 int ispassive; 2409 2410 if (hostinfo) { 2411 lreply(211, "%s FTP server status:", hostname); 2412 printf(" %s\r\n", version); 2413 } else 2414 lreply(211, "FTP server status:"); 2415 printf(" Connected to %s", remotehost); 2416 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2417 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2418 hname[sizeof(hname) - 1] = 0; 2419 if (strcmp(hname, remotehost) != 0) 2420 printf(" (%s)", hname); 2421 } 2422 printf("\r\n"); 2423 if (logged_in) { 2424 if (guest) 2425 printf(" Logged in anonymously\r\n"); 2426 else 2427 printf(" Logged in as %s\r\n", pw->pw_name); 2428 } else if (askpasswd) 2429 printf(" Waiting for password\r\n"); 2430 else 2431 printf(" Waiting for user name\r\n"); 2432 printf(" TYPE: %s", typenames[type]); 2433 if (type == TYPE_A || type == TYPE_E) 2434 printf(", FORM: %s", formnames[form]); 2435 if (type == TYPE_L) 2436#if CHAR_BIT == 8 2437 printf(" %d", CHAR_BIT); 2438#else 2439 printf(" %d", bytesize); /* need definition! */ 2440#endif 2441 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2442 strunames[stru], modenames[mode]); 2443 if (data != -1) 2444 printf(" Data connection open\r\n"); 2445 else if (pdata != -1) { 2446 ispassive = 1; 2447 su = &pasv_addr; 2448 goto printaddr; 2449 } else if (usedefault == 0) { 2450 ispassive = 0; 2451 su = &data_dest; 2452printaddr: 2453#define UC(b) (((int) b) & 0xff) 2454 if (epsvall) { 2455 printf(" EPSV only mode (EPSV ALL)\r\n"); 2456 goto epsvonly; 2457 } 2458 2459 /* PORT/PASV */ 2460 if (su->su_family == AF_INET) { 2461 a = (u_char *) &su->su_sin.sin_addr; 2462 p = (u_char *) &su->su_sin.sin_port; 2463 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2464 ispassive ? "PASV" : "PORT", 2465 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2466 UC(p[0]), UC(p[1])); 2467 } 2468 2469 /* LPRT/LPSV */ 2470 { 2471 int alen, af, i; 2472 2473 switch (su->su_family) { 2474 case AF_INET: 2475 a = (u_char *) &su->su_sin.sin_addr; 2476 p = (u_char *) &su->su_sin.sin_port; 2477 alen = sizeof(su->su_sin.sin_addr); 2478 af = 4; 2479 break; 2480 case AF_INET6: 2481 a = (u_char *) &su->su_sin6.sin6_addr; 2482 p = (u_char *) &su->su_sin6.sin6_port; 2483 alen = sizeof(su->su_sin6.sin6_addr); 2484 af = 6; 2485 break; 2486 default: 2487 af = 0; 2488 break; 2489 } 2490 if (af) { 2491 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2492 af, alen); 2493 for (i = 0; i < alen; i++) 2494 printf("%d,", UC(a[i])); 2495 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2496 } 2497 } 2498 2499epsvonly:; 2500 /* EPRT/EPSV */ 2501 { 2502 int af; 2503 2504 switch (su->su_family) { 2505 case AF_INET: 2506 af = 1; 2507 break; 2508 case AF_INET6: 2509 af = 2; 2510 break; 2511 default: 2512 af = 0; 2513 break; 2514 } 2515 if (af) { 2516 union sockunion tmp; 2517 2518 tmp = *su; 2519 if (tmp.su_family == AF_INET6) 2520 tmp.su_sin6.sin6_scope_id = 0; 2521 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2522 hname, sizeof(hname) - 1, NULL, 0, 2523 NI_NUMERICHOST)) { 2524 hname[sizeof(hname) - 1] = 0; 2525 printf(" %s |%d|%s|%d|\r\n", 2526 ispassive ? "EPSV" : "EPRT", 2527 af, hname, htons(tmp.su_port)); 2528 } 2529 } 2530 } 2531#undef UC 2532 } else 2533 printf(" No data connection\r\n"); 2534 reply(211, "End of status."); 2535} 2536 2537void 2538fatalerror(char *s) 2539{ 2540 2541 reply(451, "Error in server: %s", s); 2542 reply(221, "Closing connection due to server error."); 2543 dologout(0); 2544 /* NOTREACHED */ 2545} 2546 2547void 2548reply(int n, const char *fmt, ...) 2549{ 2550 va_list ap; 2551 2552 (void)printf("%d ", n); 2553 va_start(ap, fmt); 2554 (void)vprintf(fmt, ap); 2555 va_end(ap); 2556 (void)printf("\r\n"); 2557 (void)fflush(stdout); 2558 if (ftpdebug) { 2559 syslog(LOG_DEBUG, "<--- %d ", n); 2560 va_start(ap, fmt); 2561 vsyslog(LOG_DEBUG, fmt, ap); 2562 va_end(ap); 2563 } 2564} 2565 2566void 2567lreply(int n, const char *fmt, ...) 2568{ 2569 va_list ap; 2570 2571 (void)printf("%d- ", n); 2572 va_start(ap, fmt); 2573 (void)vprintf(fmt, ap); 2574 va_end(ap); 2575 (void)printf("\r\n"); 2576 (void)fflush(stdout); 2577 if (ftpdebug) { 2578 syslog(LOG_DEBUG, "<--- %d- ", n); 2579 va_start(ap, fmt); 2580 vsyslog(LOG_DEBUG, fmt, ap); 2581 va_end(ap); 2582 } 2583} 2584 2585static void 2586ack(char *s) 2587{ 2588 2589 reply(250, "%s command successful.", s); 2590} 2591 2592void 2593nack(char *s) 2594{ 2595 2596 reply(502, "%s command not implemented.", s); 2597} 2598 2599/* ARGSUSED */ 2600void 2601yyerror(char *s) 2602{ 2603 char *cp; 2604 2605 if ((cp = strchr(cbuf,'\n'))) 2606 *cp = '\0'; 2607 reply(500, "%s: command not understood.", cbuf); 2608} 2609 2610void 2611delete(char *name) 2612{ 2613 struct stat st; 2614 2615 LOGCMD("delete", name); 2616 if (lstat(name, &st) < 0) { 2617 perror_reply(550, name); 2618 return; 2619 } 2620 if (S_ISDIR(st.st_mode)) { 2621 if (rmdir(name) < 0) { 2622 perror_reply(550, name); 2623 return; 2624 } 2625 goto done; 2626 } 2627 if (guest && noguestmod) { 2628 reply(550, "Operation not permitted."); 2629 return; 2630 } 2631 if (unlink(name) < 0) { 2632 perror_reply(550, name); 2633 return; 2634 } 2635done: 2636 ack("DELE"); 2637} 2638 2639void 2640cwd(char *path) 2641{ 2642 2643 if (chdir(path) < 0) 2644 perror_reply(550, path); 2645 else 2646 ack("CWD"); 2647} 2648 2649void 2650makedir(char *name) 2651{ 2652 char *s; 2653 2654 LOGCMD("mkdir", name); 2655 if (guest && noguestmkd) 2656 reply(550, "Operation not permitted."); 2657 else if (mkdir(name, 0777) < 0) 2658 perror_reply(550, name); 2659 else { 2660 if ((s = doublequote(name)) == NULL) 2661 fatalerror("Ran out of memory."); 2662 reply(257, "\"%s\" directory created.", s); 2663 free(s); 2664 } 2665} 2666 2667void 2668removedir(char *name) 2669{ 2670 2671 LOGCMD("rmdir", name); 2672 if (rmdir(name) < 0) 2673 perror_reply(550, name); 2674 else 2675 ack("RMD"); 2676} 2677 2678void 2679pwd(void) 2680{ 2681 char *s, path[MAXPATHLEN + 1]; 2682 2683 if (getcwd(path, sizeof(path)) == NULL) 2684 perror_reply(550, "Get current directory"); 2685 else { 2686 if ((s = doublequote(path)) == NULL) 2687 fatalerror("Ran out of memory."); 2688 reply(257, "\"%s\" is current directory.", s); 2689 free(s); 2690 } 2691} 2692 2693char * 2694renamefrom(char *name) 2695{ 2696 struct stat st; 2697 2698 if (guest && noguestmod) { 2699 reply(550, "Operation not permitted."); 2700 return (NULL); 2701 } 2702 if (lstat(name, &st) < 0) { 2703 perror_reply(550, name); 2704 return (NULL); 2705 } 2706 reply(350, "File exists, ready for destination name."); 2707 return (name); 2708} 2709 2710void 2711renamecmd(char *from, char *to) 2712{ 2713 struct stat st; 2714 2715 LOGCMD2("rename", from, to); 2716 2717 if (guest && (stat(to, &st) == 0)) { 2718 reply(550, "%s: permission denied.", to); 2719 return; 2720 } 2721 2722 if (rename(from, to) < 0) 2723 perror_reply(550, "rename"); 2724 else 2725 ack("RNTO"); 2726} 2727 2728static void 2729dolog(struct sockaddr *who) 2730{ 2731 char who_name[NI_MAXHOST]; 2732 2733 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2734 remotehost[sizeof(remotehost) - 1] = 0; 2735 if (getnameinfo(who, who->sa_len, 2736 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2737 *who_name = 0; 2738 who_name[sizeof(who_name) - 1] = 0; 2739 2740#ifdef SETPROCTITLE 2741#ifdef VIRTUAL_HOSTING 2742 if (thishost != firsthost) 2743 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2744 remotehost, hostname); 2745 else 2746#endif 2747 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2748 remotehost); 2749 setproctitle("%s", proctitle); 2750#endif /* SETPROCTITLE */ 2751 2752 if (logging) { 2753#ifdef VIRTUAL_HOSTING 2754 if (thishost != firsthost) 2755 syslog(LOG_INFO, "connection from %s (%s) to %s", 2756 remotehost, who_name, hostname); 2757 else 2758#endif 2759 syslog(LOG_INFO, "connection from %s (%s)", 2760 remotehost, who_name); 2761 } 2762} 2763 2764/* 2765 * Record logout in wtmp file 2766 * and exit with supplied status. 2767 */ 2768void 2769dologout(int status) 2770{ 2771 2772 if (logged_in && dowtmp) { 2773 (void) seteuid(0); 2774 ftpd_logwtmp(wtmpid, NULL, NULL); 2775 } 2776 /* beware of flushing buffers after a SIGPIPE */ 2777 _exit(status); 2778} 2779 2780static void 2781sigurg(int signo) 2782{ 2783 2784 recvurg = 1; 2785} 2786 2787static void 2788maskurg(int flag) 2789{ 2790 int oerrno; 2791 sigset_t sset; 2792 2793 if (!transflag) { 2794 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2795 return; 2796 } 2797 oerrno = errno; 2798 sigemptyset(&sset); 2799 sigaddset(&sset, SIGURG); 2800 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2801 errno = oerrno; 2802} 2803 2804static void 2805flagxfer(int flag) 2806{ 2807 2808 if (flag) { 2809 if (transflag) 2810 syslog(LOG_ERR, "Internal: flagxfer(1): " 2811 "transfer already under way"); 2812 transflag = 1; 2813 maskurg(0); 2814 recvurg = 0; 2815 } else { 2816 if (!transflag) 2817 syslog(LOG_ERR, "Internal: flagxfer(0): " 2818 "no active transfer"); 2819 maskurg(1); 2820 transflag = 0; 2821 } 2822} 2823 2824/* 2825 * Returns 0 if OK to resume or -1 if abort requested. 2826 */ 2827static int 2828myoob(void) 2829{ 2830 char *cp; 2831 int ret; 2832 2833 if (!transflag) { 2834 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2835 return (0); 2836 } 2837 cp = tmpline; 2838 ret = get_line(cp, 7, stdin); 2839 if (ret == -1) { 2840 reply(221, "You could at least say goodbye."); 2841 dologout(0); 2842 } else if (ret == -2) { 2843 /* Ignore truncated command. */ 2844 return (0); 2845 } 2846 upper(cp); 2847 if (strcmp(cp, "ABOR\r\n") == 0) { 2848 tmpline[0] = '\0'; 2849 reply(426, "Transfer aborted. Data connection closed."); 2850 reply(226, "Abort successful."); 2851 return (-1); 2852 } 2853 if (strcmp(cp, "STAT\r\n") == 0) { 2854 tmpline[0] = '\0'; 2855 if (file_size != -1) 2856 reply(213, "Status: %jd of %jd bytes transferred.", 2857 (intmax_t)byte_count, (intmax_t)file_size); 2858 else 2859 reply(213, "Status: %jd bytes transferred.", 2860 (intmax_t)byte_count); 2861 } 2862 return (0); 2863} 2864 2865/* 2866 * Note: a response of 425 is not mentioned as a possible response to 2867 * the PASV command in RFC959. However, it has been blessed as 2868 * a legitimate response by Jon Postel in a telephone conversation 2869 * with Rick Adams on 25 Jan 89. 2870 */ 2871void 2872passive(void) 2873{ 2874 socklen_t len; 2875 int on; 2876 char *p, *a; 2877 2878 if (pdata >= 0) /* close old port if one set */ 2879 close(pdata); 2880 2881 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2882 if (pdata < 0) { 2883 perror_reply(425, "Can't open passive connection"); 2884 return; 2885 } 2886 on = 1; 2887 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2888 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2889 2890 (void) seteuid(0); 2891 2892#ifdef IP_PORTRANGE 2893 if (ctrl_addr.su_family == AF_INET) { 2894 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2895 : IP_PORTRANGE_DEFAULT; 2896 2897 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2898 &on, sizeof(on)) < 0) 2899 goto pasv_error; 2900 } 2901#endif 2902#ifdef IPV6_PORTRANGE 2903 if (ctrl_addr.su_family == AF_INET6) { 2904 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2905 : IPV6_PORTRANGE_DEFAULT; 2906 2907 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2908 &on, sizeof(on)) < 0) 2909 goto pasv_error; 2910 } 2911#endif 2912 2913 pasv_addr = ctrl_addr; 2914 pasv_addr.su_port = 0; 2915 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2916 goto pasv_error; 2917 2918 (void) seteuid(pw->pw_uid); 2919 2920 len = sizeof(pasv_addr); 2921 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2922 goto pasv_error; 2923 if (listen(pdata, 1) < 0) 2924 goto pasv_error; 2925 if (pasv_addr.su_family == AF_INET) 2926 a = (char *) &pasv_addr.su_sin.sin_addr; 2927 else if (pasv_addr.su_family == AF_INET6 && 2928 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2929 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2930 else 2931 goto pasv_error; 2932 2933 p = (char *) &pasv_addr.su_port; 2934 2935#define UC(b) (((int) b) & 0xff) 2936 2937 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2938 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2939 return; 2940 2941pasv_error: 2942 (void) seteuid(pw->pw_uid); 2943 (void) close(pdata); 2944 pdata = -1; 2945 perror_reply(425, "Can't open passive connection"); 2946 return; 2947} 2948 2949/* 2950 * Long Passive defined in RFC 1639. 2951 * 228 Entering Long Passive Mode 2952 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2953 */ 2954 2955void 2956long_passive(char *cmd, int pf) 2957{ 2958 socklen_t len; 2959 int on; 2960 char *p, *a; 2961 2962 if (pdata >= 0) /* close old port if one set */ 2963 close(pdata); 2964 2965 if (pf != PF_UNSPEC) { 2966 if (ctrl_addr.su_family != pf) { 2967 switch (ctrl_addr.su_family) { 2968 case AF_INET: 2969 pf = 1; 2970 break; 2971 case AF_INET6: 2972 pf = 2; 2973 break; 2974 default: 2975 pf = 0; 2976 break; 2977 } 2978 /* 2979 * XXX 2980 * only EPRT/EPSV ready clients will understand this 2981 */ 2982 if (strcmp(cmd, "EPSV") == 0 && pf) { 2983 reply(522, "Network protocol mismatch, " 2984 "use (%d)", pf); 2985 } else 2986 reply(501, "Network protocol mismatch."); /*XXX*/ 2987 2988 return; 2989 } 2990 } 2991 2992 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2993 if (pdata < 0) { 2994 perror_reply(425, "Can't open passive connection"); 2995 return; 2996 } 2997 on = 1; 2998 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2999 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 3000 3001 (void) seteuid(0); 3002 3003 pasv_addr = ctrl_addr; 3004 pasv_addr.su_port = 0; 3005 len = pasv_addr.su_len; 3006 3007#ifdef IP_PORTRANGE 3008 if (ctrl_addr.su_family == AF_INET) { 3009 on = restricted_data_ports ? IP_PORTRANGE_HIGH 3010 : IP_PORTRANGE_DEFAULT; 3011 3012 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 3013 &on, sizeof(on)) < 0) 3014 goto pasv_error; 3015 } 3016#endif 3017#ifdef IPV6_PORTRANGE 3018 if (ctrl_addr.su_family == AF_INET6) { 3019 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 3020 : IPV6_PORTRANGE_DEFAULT; 3021 3022 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 3023 &on, sizeof(on)) < 0) 3024 goto pasv_error; 3025 } 3026#endif 3027 3028 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 3029 goto pasv_error; 3030 3031 (void) seteuid(pw->pw_uid); 3032 3033 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 3034 goto pasv_error; 3035 if (listen(pdata, 1) < 0) 3036 goto pasv_error; 3037 3038#define UC(b) (((int) b) & 0xff) 3039 3040 if (strcmp(cmd, "LPSV") == 0) { 3041 p = (char *)&pasv_addr.su_port; 3042 switch (pasv_addr.su_family) { 3043 case AF_INET: 3044 a = (char *) &pasv_addr.su_sin.sin_addr; 3045 v4_reply: 3046 reply(228, 3047"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3048 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3049 2, UC(p[0]), UC(p[1])); 3050 return; 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 } 3067 } else if (strcmp(cmd, "EPSV") == 0) { 3068 switch (pasv_addr.su_family) { 3069 case AF_INET: 3070 case AF_INET6: 3071 reply(229, "Entering Extended Passive Mode (|||%d|)", 3072 ntohs(pasv_addr.su_port)); 3073 return; 3074 } 3075 } else { 3076 /* more proper error code? */ 3077 } 3078 3079pasv_error: 3080 (void) seteuid(pw->pw_uid); 3081 (void) close(pdata); 3082 pdata = -1; 3083 perror_reply(425, "Can't open passive connection"); 3084 return; 3085} 3086 3087/* 3088 * Generate unique name for file with basename "local" 3089 * and open the file in order to avoid possible races. 3090 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3091 * Return descriptor to the file, set "name" to its name. 3092 * 3093 * Generates failure reply on error. 3094 */ 3095static int 3096guniquefd(char *local, char **name) 3097{ 3098 static char new[MAXPATHLEN]; 3099 struct stat st; 3100 char *cp; 3101 int count; 3102 int fd; 3103 3104 cp = strrchr(local, '/'); 3105 if (cp) 3106 *cp = '\0'; 3107 if (stat(cp ? local : ".", &st) < 0) { 3108 perror_reply(553, cp ? local : "."); 3109 return (-1); 3110 } 3111 if (cp) { 3112 /* 3113 * Let not overwrite dirname with counter suffix. 3114 * -4 is for /nn\0 3115 * In this extreme case dot won't be put in front of suffix. 3116 */ 3117 if (strlen(local) > sizeof(new) - 4) { 3118 reply(553, "Pathname too long."); 3119 return (-1); 3120 } 3121 *cp = '/'; 3122 } 3123 /* -4 is for the .nn<null> we put on the end below */ 3124 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3125 cp = new + strlen(new); 3126 /* 3127 * Don't generate dotfile unless requested explicitly. 3128 * This covers the case when basename gets truncated off 3129 * by buffer size. 3130 */ 3131 if (cp > new && cp[-1] != '/') 3132 *cp++ = '.'; 3133 for (count = 0; count < 100; count++) { 3134 /* At count 0 try unmodified name */ 3135 if (count) 3136 (void)sprintf(cp, "%d", count); 3137 if ((fd = open(count ? new : local, 3138 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3139 *name = count ? new : local; 3140 return (fd); 3141 } 3142 if (errno != EEXIST) { 3143 perror_reply(553, count ? new : local); 3144 return (-1); 3145 } 3146 } 3147 reply(452, "Unique file name cannot be created."); 3148 return (-1); 3149} 3150 3151/* 3152 * Format and send reply containing system error number. 3153 */ 3154void 3155perror_reply(int code, char *string) 3156{ 3157 3158 reply(code, "%s: %s.", string, strerror(errno)); 3159} 3160 3161static char *onefile[] = { 3162 "", 3163 0 3164}; 3165 3166void 3167send_file_list(char *whichf) 3168{ 3169 struct stat st; 3170 DIR *dirp = NULL; 3171 struct dirent *dir; 3172 FILE *dout = NULL; 3173 char **dirlist, *dirname; 3174 int simple = 0; 3175 int freeglob = 0; 3176 glob_t gl; 3177 3178 if (strpbrk(whichf, "~{[*?") != NULL) { 3179 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3180 3181 memset(&gl, 0, sizeof(gl)); 3182 gl.gl_matchc = MAXGLOBARGS; 3183 flags |= GLOB_LIMIT; 3184 freeglob = 1; 3185 if (glob(whichf, flags, 0, &gl)) { 3186 reply(550, "No matching files found."); 3187 goto out; 3188 } else if (gl.gl_pathc == 0) { 3189 errno = ENOENT; 3190 perror_reply(550, whichf); 3191 goto out; 3192 } 3193 dirlist = gl.gl_pathv; 3194 } else { 3195 onefile[0] = whichf; 3196 dirlist = onefile; 3197 simple = 1; 3198 } 3199 3200 while ((dirname = *dirlist++)) { 3201 if (stat(dirname, &st) < 0) { 3202 /* 3203 * If user typed "ls -l", etc, and the client 3204 * used NLST, do what the user meant. 3205 */ 3206 if (dirname[0] == '-' && *dirlist == NULL && 3207 dout == NULL) 3208 retrieve(_PATH_LS " %s", dirname); 3209 else 3210 perror_reply(550, whichf); 3211 goto out; 3212 } 3213 3214 if (S_ISREG(st.st_mode)) { 3215 if (dout == NULL) { 3216 dout = dataconn("file list", -1, "w"); 3217 if (dout == NULL) 3218 goto out; 3219 STARTXFER; 3220 } 3221 START_UNSAFE; 3222 fprintf(dout, "%s%s\n", dirname, 3223 type == TYPE_A ? "\r" : ""); 3224 END_UNSAFE; 3225 if (ferror(dout)) 3226 goto data_err; 3227 byte_count += strlen(dirname) + 3228 (type == TYPE_A ? 2 : 1); 3229 CHECKOOB(goto abrt); 3230 continue; 3231 } else if (!S_ISDIR(st.st_mode)) 3232 continue; 3233 3234 if ((dirp = opendir(dirname)) == NULL) 3235 continue; 3236 3237 while ((dir = readdir(dirp)) != NULL) { 3238 char nbuf[MAXPATHLEN]; 3239 3240 CHECKOOB(goto abrt); 3241 3242 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3243 continue; 3244 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3245 dir->d_namlen == 2) 3246 continue; 3247 3248 snprintf(nbuf, sizeof(nbuf), 3249 "%s/%s", dirname, dir->d_name); 3250 3251 /* 3252 * We have to do a stat to insure it's 3253 * not a directory or special file. 3254 */ 3255 if (simple || (stat(nbuf, &st) == 0 && 3256 S_ISREG(st.st_mode))) { 3257 if (dout == NULL) { 3258 dout = dataconn("file list", -1, "w"); 3259 if (dout == NULL) 3260 goto out; 3261 STARTXFER; 3262 } 3263 START_UNSAFE; 3264 if (nbuf[0] == '.' && nbuf[1] == '/') 3265 fprintf(dout, "%s%s\n", &nbuf[2], 3266 type == TYPE_A ? "\r" : ""); 3267 else 3268 fprintf(dout, "%s%s\n", nbuf, 3269 type == TYPE_A ? "\r" : ""); 3270 END_UNSAFE; 3271 if (ferror(dout)) 3272 goto data_err; 3273 byte_count += strlen(nbuf) + 3274 (type == TYPE_A ? 2 : 1); 3275 CHECKOOB(goto abrt); 3276 } 3277 } 3278 (void) closedir(dirp); 3279 dirp = NULL; 3280 } 3281 3282 if (dout == NULL) 3283 reply(550, "No files found."); 3284 else if (ferror(dout)) 3285data_err: perror_reply(550, "Data connection"); 3286 else 3287 reply(226, "Transfer complete."); 3288out: 3289 if (dout) { 3290 ENDXFER; 3291abrt: 3292 (void) fclose(dout); 3293 data = -1; 3294 pdata = -1; 3295 } 3296 if (dirp) 3297 (void) closedir(dirp); 3298 if (freeglob) { 3299 freeglob = 0; 3300 globfree(&gl); 3301 } 3302} 3303 3304void 3305reapchild(int signo) 3306{ 3307 while (waitpid(-1, NULL, WNOHANG) > 0); 3308} 3309 3310#ifdef OLD_SETPROCTITLE 3311/* 3312 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3313 * Warning, since this is usually started from inetd.conf, it often doesn't 3314 * have much of an environment or arglist to overwrite. 3315 */ 3316void 3317setproctitle(const char *fmt, ...) 3318{ 3319 int i; 3320 va_list ap; 3321 char *p, *bp, ch; 3322 char buf[LINE_MAX]; 3323 3324 va_start(ap, fmt); 3325 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3326 3327 /* make ps print our process name */ 3328 p = Argv[0]; 3329 *p++ = '-'; 3330 3331 i = strlen(buf); 3332 if (i > LastArgv - p - 2) { 3333 i = LastArgv - p - 2; 3334 buf[i] = '\0'; 3335 } 3336 bp = buf; 3337 while (ch = *bp++) 3338 if (ch != '\n' && ch != '\r') 3339 *p++ = ch; 3340 while (p < LastArgv) 3341 *p++ = ' '; 3342} 3343#endif /* OLD_SETPROCTITLE */ 3344 3345static void 3346appendf(char **strp, char *fmt, ...) 3347{ 3348 va_list ap; 3349 char *ostr, *p; 3350 3351 va_start(ap, fmt); 3352 vasprintf(&p, fmt, ap); 3353 va_end(ap); 3354 if (p == NULL) 3355 fatalerror("Ran out of memory."); 3356 if (*strp == NULL) 3357 *strp = p; 3358 else { 3359 ostr = *strp; 3360 asprintf(strp, "%s%s", ostr, p); 3361 if (*strp == NULL) 3362 fatalerror("Ran out of memory."); 3363 free(ostr); 3364 } 3365} 3366 3367static void 3368logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3369{ 3370 char *msg = NULL; 3371 char wd[MAXPATHLEN + 1]; 3372 3373 if (logging <= 1) 3374 return; 3375 3376 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3377 strcpy(wd, strerror(errno)); 3378 3379 appendf(&msg, "%s", cmd); 3380 if (file1) 3381 appendf(&msg, " %s", file1); 3382 if (file2) 3383 appendf(&msg, " %s", file2); 3384 if (cnt >= 0) 3385 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3386 appendf(&msg, " (wd: %s", wd); 3387 if (guest || dochroot) 3388 appendf(&msg, "; chrooted"); 3389 appendf(&msg, ")"); 3390 syslog(LOG_INFO, "%s", msg); 3391 free(msg); 3392} 3393 3394static void 3395logxfer(char *name, off_t size, time_t start) 3396{ 3397 char buf[MAXPATHLEN + 1024]; 3398 char path[MAXPATHLEN + 1]; 3399 time_t now; 3400 3401 if (statfd >= 0) { 3402 time(&now); 3403 if (realpath(name, path) == NULL) { 3404 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3405 return; 3406 } 3407 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3408 ctime(&now)+4, ident, remotehost, 3409 path, (intmax_t)size, 3410 (long)(now - start + (now == start))); 3411 write(statfd, buf, strlen(buf)); 3412 } 3413} 3414 3415static char * 3416doublequote(char *s) 3417{ 3418 int n; 3419 char *p, *s2; 3420 3421 for (p = s, n = 0; *p; p++) 3422 if (*p == '"') 3423 n++; 3424 3425 if ((s2 = malloc(p - s + n + 1)) == NULL) 3426 return (NULL); 3427 3428 for (p = s2; *s; s++, p++) { 3429 if ((*p = *s) == '"') 3430 *(++p) = '"'; 3431 } 3432 *p = '\0'; 3433 3434 return (s2); 3435} 3436 3437/* setup server socket for specified address family */ 3438/* if af is PF_UNSPEC more than one socket may be returned */ 3439/* the returned list is dynamically allocated, so caller needs to free it */ 3440static int * 3441socksetup(int af, char *bindname, const char *bindport) 3442{ 3443 struct addrinfo hints, *res, *r; 3444 int error, maxs, *s, *socks; 3445 const int on = 1; 3446 3447 memset(&hints, 0, sizeof(hints)); 3448 hints.ai_flags = AI_PASSIVE; 3449 hints.ai_family = af; 3450 hints.ai_socktype = SOCK_STREAM; 3451 error = getaddrinfo(bindname, bindport, &hints, &res); 3452 if (error) { 3453 syslog(LOG_ERR, "%s", gai_strerror(error)); 3454 if (error == EAI_SYSTEM) 3455 syslog(LOG_ERR, "%s", strerror(errno)); 3456 return NULL; 3457 } 3458 3459 /* Count max number of sockets we may open */ 3460 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3461 ; 3462 socks = malloc((maxs + 1) * sizeof(int)); 3463 if (!socks) { 3464 freeaddrinfo(res); 3465 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3466 return NULL; 3467 } 3468 3469 *socks = 0; /* num of sockets counter at start of array */ 3470 s = socks + 1; 3471 for (r = res; r; r = r->ai_next) { 3472 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3473 if (*s < 0) { 3474 syslog(LOG_DEBUG, "control socket: %m"); 3475 continue; 3476 } 3477 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3478 &on, sizeof(on)) < 0) 3479 syslog(LOG_WARNING, 3480 "control setsockopt (SO_REUSEADDR): %m"); 3481 if (r->ai_family == AF_INET6) { 3482 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3483 &on, sizeof(on)) < 0) 3484 syslog(LOG_WARNING, 3485 "control setsockopt (IPV6_V6ONLY): %m"); 3486 } 3487 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3488 syslog(LOG_DEBUG, "control bind: %m"); 3489 close(*s); 3490 continue; 3491 } 3492 (*socks)++; 3493 s++; 3494 } 3495 3496 if (res) 3497 freeaddrinfo(res); 3498 3499 if (*socks == 0) { 3500 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3501 free(socks); 3502 return NULL; 3503 } 3504 return(socks); 3505} 3506