ftpd.c revision 228843
1/* 2 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#if 0 35#ifndef lint 36static char copyright[] = 37"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39#endif /* not lint */ 40#endif 41 42#ifndef lint 43#if 0 44static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 45#endif 46#endif /* not lint */ 47 48#include <sys/cdefs.h> 49__FBSDID("$FreeBSD: head/libexec/ftpd/ftpd.c 228843 2011-12-23 15:00:37Z cperciva $"); 50 51/* 52 * FTP server. 53 */ 54#include <sys/param.h> 55#include <sys/ioctl.h> 56#include <sys/mman.h> 57#include <sys/socket.h> 58#include <sys/stat.h> 59#include <sys/time.h> 60#include <sys/wait.h> 61 62#include <netinet/in.h> 63#include <netinet/in_systm.h> 64#include <netinet/ip.h> 65#include <netinet/tcp.h> 66 67#define FTP_NAMES 68#include <arpa/ftp.h> 69#include <arpa/inet.h> 70#include <arpa/telnet.h> 71 72#include <ctype.h> 73#include <dirent.h> 74#include <err.h> 75#include <errno.h> 76#include <fcntl.h> 77#include <glob.h> 78#include <limits.h> 79#include <netdb.h> 80#include <pwd.h> 81#include <grp.h> 82#include <opie.h> 83#include <signal.h> 84#include <stdint.h> 85#include <stdio.h> 86#include <stdlib.h> 87#include <string.h> 88#include <syslog.h> 89#include <time.h> 90#include <unistd.h> 91#include <libutil.h> 92#ifdef LOGIN_CAP 93#include <login_cap.h> 94#endif 95 96#ifdef USE_PAM 97#include <security/pam_appl.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; 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, 0); 508 (void) dup2(fd, 1); 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(0, (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(0, (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(0, 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(0, 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(0, 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(fileno(stdin), 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 for (;;) 648 (void) yyparse(); 649 /* NOTREACHED */ 650} 651 652static void 653lostconn(int signo) 654{ 655 656 if (ftpdebug) 657 syslog(LOG_DEBUG, "lost connection"); 658 dologout(1); 659} 660 661static void 662sigquit(int signo) 663{ 664 665 syslog(LOG_ERR, "got signal %d", signo); 666 dologout(1); 667} 668 669#ifdef VIRTUAL_HOSTING 670/* 671 * read in virtual host tables (if they exist) 672 */ 673 674static void 675inithosts(int family) 676{ 677 int insert; 678 size_t len; 679 FILE *fp; 680 char *cp, *mp, *line; 681 char *hostname; 682 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 683 struct ftphost *hrp, *lhrp; 684 struct addrinfo hints, *res, *ai; 685 686 /* 687 * Fill in the default host information 688 */ 689 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 690 fatalerror("Ran out of memory."); 691 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 692 hostname[0] = '\0'; 693 hostname[MAXHOSTNAMELEN - 1] = '\0'; 694 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 695 fatalerror("Ran out of memory."); 696 hrp->hostname = hostname; 697 hrp->hostinfo = NULL; 698 699 memset(&hints, 0, sizeof(hints)); 700 hints.ai_flags = AI_PASSIVE; 701 hints.ai_family = family; 702 hints.ai_socktype = SOCK_STREAM; 703 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 704 hrp->hostinfo = res; 705 hrp->statfile = _PATH_FTPDSTATFILE; 706 hrp->welcome = _PATH_FTPWELCOME; 707 hrp->loginmsg = _PATH_FTPLOGINMESG; 708 hrp->anonuser = "ftp"; 709 hrp->next = NULL; 710 thishost = firsthost = lhrp = hrp; 711 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 712 int addrsize, gothost; 713 void *addr; 714 struct hostent *hp; 715 716 while ((line = fgetln(fp, &len)) != NULL) { 717 int i, hp_error; 718 719 /* skip comments */ 720 if (line[0] == '#') 721 continue; 722 if (line[len - 1] == '\n') { 723 line[len - 1] = '\0'; 724 mp = NULL; 725 } else { 726 if ((mp = malloc(len + 1)) == NULL) 727 fatalerror("Ran out of memory."); 728 memcpy(mp, line, len); 729 mp[len] = '\0'; 730 line = mp; 731 } 732 cp = strtok(line, " \t"); 733 /* skip empty lines */ 734 if (cp == NULL) 735 goto nextline; 736 vhost = cp; 737 738 /* set defaults */ 739 anonuser = "ftp"; 740 statfile = _PATH_FTPDSTATFILE; 741 welcome = _PATH_FTPWELCOME; 742 loginmsg = _PATH_FTPLOGINMESG; 743 744 /* 745 * Preparse the line so we can use its info 746 * for all the addresses associated with 747 * the virtual host name. 748 * Field 0, the virtual host name, is special: 749 * it's already parsed off and will be strdup'ed 750 * later, after we know its canonical form. 751 */ 752 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 753 if (*cp != '-' && (cp = strdup(cp))) 754 switch (i) { 755 case 1: /* anon user permissions */ 756 anonuser = cp; 757 break; 758 case 2: /* statistics file */ 759 statfile = cp; 760 break; 761 case 3: /* welcome message */ 762 welcome = cp; 763 break; 764 case 4: /* login message */ 765 loginmsg = cp; 766 break; 767 default: /* programming error */ 768 abort(); 769 /* NOTREACHED */ 770 } 771 772 hints.ai_flags = AI_PASSIVE; 773 hints.ai_family = family; 774 hints.ai_socktype = SOCK_STREAM; 775 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 776 goto nextline; 777 for (ai = res; ai != NULL && ai->ai_addr != NULL; 778 ai = ai->ai_next) { 779 780 gothost = 0; 781 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 782 struct addrinfo *hi; 783 784 for (hi = hrp->hostinfo; hi != NULL; 785 hi = hi->ai_next) 786 if (hi->ai_addrlen == ai->ai_addrlen && 787 memcmp(hi->ai_addr, 788 ai->ai_addr, 789 ai->ai_addr->sa_len) == 0) { 790 gothost++; 791 break; 792 } 793 if (gothost) 794 break; 795 } 796 if (hrp == NULL) { 797 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 798 goto nextline; 799 hrp->hostname = NULL; 800 insert = 1; 801 } else { 802 if (hrp->hostinfo && hrp->hostinfo != res) 803 freeaddrinfo(hrp->hostinfo); 804 insert = 0; /* host already in the chain */ 805 } 806 hrp->hostinfo = res; 807 808 /* 809 * determine hostname to use. 810 * force defined name if there is a valid alias 811 * otherwise fallback to primary hostname 812 */ 813 /* XXX: getaddrinfo() can't do alias check */ 814 switch(hrp->hostinfo->ai_family) { 815 case AF_INET: 816 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 817 addrsize = sizeof(struct in_addr); 818 break; 819 case AF_INET6: 820 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 821 addrsize = sizeof(struct in6_addr); 822 break; 823 default: 824 /* should not reach here */ 825 freeaddrinfo(hrp->hostinfo); 826 if (insert) 827 free(hrp); /*not in chain, can free*/ 828 else 829 hrp->hostinfo = NULL; /*mark as blank*/ 830 goto nextline; 831 /* NOTREACHED */ 832 } 833 if ((hp = getipnodebyaddr(addr, addrsize, 834 hrp->hostinfo->ai_family, 835 &hp_error)) != NULL) { 836 if (strcmp(vhost, hp->h_name) != 0) { 837 if (hp->h_aliases == NULL) 838 vhost = hp->h_name; 839 else { 840 i = 0; 841 while (hp->h_aliases[i] && 842 strcmp(vhost, hp->h_aliases[i]) != 0) 843 ++i; 844 if (hp->h_aliases[i] == NULL) 845 vhost = hp->h_name; 846 } 847 } 848 } 849 if (hrp->hostname && 850 strcmp(hrp->hostname, vhost) != 0) { 851 free(hrp->hostname); 852 hrp->hostname = NULL; 853 } 854 if (hrp->hostname == NULL && 855 (hrp->hostname = strdup(vhost)) == NULL) { 856 freeaddrinfo(hrp->hostinfo); 857 hrp->hostinfo = NULL; /* mark as blank */ 858 if (hp) 859 freehostent(hp); 860 goto nextline; 861 } 862 hrp->anonuser = anonuser; 863 hrp->statfile = statfile; 864 hrp->welcome = welcome; 865 hrp->loginmsg = loginmsg; 866 if (insert) { 867 hrp->next = NULL; 868 lhrp->next = hrp; 869 lhrp = hrp; 870 } 871 if (hp) 872 freehostent(hp); 873 } 874nextline: 875 if (mp) 876 free(mp); 877 } 878 (void) fclose(fp); 879 } 880} 881 882static void 883selecthost(union sockunion *su) 884{ 885 struct ftphost *hrp; 886 u_int16_t port; 887#ifdef INET6 888 struct in6_addr *mapped_in6 = NULL; 889#endif 890 struct addrinfo *hi; 891 892#ifdef INET6 893 /* 894 * XXX IPv4 mapped IPv6 addr consideraton, 895 * specified in rfc2373. 896 */ 897 if (su->su_family == AF_INET6 && 898 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 899 mapped_in6 = &su->su_sin6.sin6_addr; 900#endif 901 902 hrp = thishost = firsthost; /* default */ 903 port = su->su_port; 904 su->su_port = 0; 905 while (hrp != NULL) { 906 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 907 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 908 thishost = hrp; 909 goto found; 910 } 911#ifdef INET6 912 /* XXX IPv4 mapped IPv6 addr consideraton */ 913 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 914 (memcmp(&mapped_in6->s6_addr[12], 915 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 916 sizeof(struct in_addr)) == 0)) { 917 thishost = hrp; 918 goto found; 919 } 920#endif 921 } 922 hrp = hrp->next; 923 } 924found: 925 su->su_port = port; 926 /* setup static variables as appropriate */ 927 hostname = thishost->hostname; 928 ftpuser = thishost->anonuser; 929} 930#endif 931 932/* 933 * Helper function for sgetpwnam(). 934 */ 935static char * 936sgetsave(char *s) 937{ 938 char *new = malloc(strlen(s) + 1); 939 940 if (new == NULL) { 941 reply(421, "Ran out of memory."); 942 dologout(1); 943 /* NOTREACHED */ 944 } 945 (void) strcpy(new, s); 946 return (new); 947} 948 949/* 950 * Save the result of a getpwnam. Used for USER command, since 951 * the data returned must not be clobbered by any other command 952 * (e.g., globbing). 953 * NB: The data returned by sgetpwnam() will remain valid until 954 * the next call to this function. Its difference from getpwnam() 955 * is that sgetpwnam() is known to be called from ftpd code only. 956 */ 957static struct passwd * 958sgetpwnam(char *name) 959{ 960 static struct passwd save; 961 struct passwd *p; 962 963 if ((p = getpwnam(name)) == NULL) 964 return (p); 965 if (save.pw_name) { 966 free(save.pw_name); 967 free(save.pw_passwd); 968 free(save.pw_gecos); 969 free(save.pw_dir); 970 free(save.pw_shell); 971 } 972 save = *p; 973 save.pw_name = sgetsave(p->pw_name); 974 save.pw_passwd = sgetsave(p->pw_passwd); 975 save.pw_gecos = sgetsave(p->pw_gecos); 976 save.pw_dir = sgetsave(p->pw_dir); 977 save.pw_shell = sgetsave(p->pw_shell); 978 return (&save); 979} 980 981static int login_attempts; /* number of failed login attempts */ 982static int askpasswd; /* had user command, ask for passwd */ 983static char curname[MAXLOGNAME]; /* current USER name */ 984 985/* 986 * USER command. 987 * Sets global passwd pointer pw if named account exists and is acceptable; 988 * sets askpasswd if a PASS command is expected. If logged in previously, 989 * need to reset state. If name is "ftp" or "anonymous", the name is not in 990 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 991 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 992 * requesting login privileges. Disallow anyone who does not have a standard 993 * shell as returned by getusershell(). Disallow anyone mentioned in the file 994 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 995 */ 996void 997user(char *name) 998{ 999 int ecode; 1000 char *cp, *shell; 1001 1002 if (logged_in) { 1003 if (guest) { 1004 reply(530, "Can't change user from guest login."); 1005 return; 1006 } else if (dochroot) { 1007 reply(530, "Can't change user from chroot user."); 1008 return; 1009 } 1010 end_login(); 1011 } 1012 1013 guest = 0; 1014#ifdef VIRTUAL_HOSTING 1015 pw = sgetpwnam(thishost->anonuser); 1016#else 1017 pw = sgetpwnam("ftp"); 1018#endif 1019 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1020 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL, &ecode) || 1021 (ecode != 0 && ecode != ENOENT)) 1022 reply(530, "User %s access denied.", name); 1023 else if (checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL, &ecode) || 1024 (ecode != 0 && ecode != ENOENT)) 1025 reply(530, "User %s access denied.", name); 1026 else if (pw != NULL) { 1027 guest = 1; 1028 askpasswd = 1; 1029 reply(331, 1030 "Guest login ok, send your email address as password."); 1031 } else 1032 reply(530, "User %s unknown.", name); 1033 if (!askpasswd && logging) 1034 syslog(LOG_NOTICE, 1035 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1036 return; 1037 } 1038 if (anon_only != 0) { 1039 reply(530, "Sorry, only anonymous ftp allowed."); 1040 return; 1041 } 1042 1043 if ((pw = sgetpwnam(name))) { 1044 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1045 shell = _PATH_BSHELL; 1046 setusershell(); 1047 while ((cp = getusershell()) != NULL) 1048 if (strcmp(cp, shell) == 0) 1049 break; 1050 endusershell(); 1051 1052 if (cp == NULL || 1053 (checkuser(_PATH_FTPUSERS, name, 1, NULL, &ecode) || 1054 (ecode != 0 && ecode != ENOENT))) { 1055 reply(530, "User %s access denied.", name); 1056 if (logging) 1057 syslog(LOG_NOTICE, 1058 "FTP LOGIN REFUSED FROM %s, %s", 1059 remotehost, name); 1060 pw = NULL; 1061 return; 1062 } 1063 } 1064 if (logging) 1065 strncpy(curname, name, sizeof(curname)-1); 1066 1067 pwok = 0; 1068#ifdef USE_PAM 1069 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1070#endif 1071 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1072 pwok = (pw != NULL) && 1073 opieaccessfile(remotehost) && 1074 opiealways(pw->pw_dir); 1075 reply(331, "Response to %s %s for %s.", 1076 opieprompt, pwok ? "requested" : "required", name); 1077 } else { 1078 pwok = 1; 1079 reply(331, "Password required for %s.", name); 1080 } 1081 askpasswd = 1; 1082 /* 1083 * Delay before reading passwd after first failed 1084 * attempt to slow down passwd-guessing programs. 1085 */ 1086 if (login_attempts) 1087 sleep(login_attempts); 1088} 1089 1090/* 1091 * Check if a user is in the file "fname", 1092 * return a pointer to a malloc'd string with the rest 1093 * of the matching line in "residue" if not NULL. 1094 */ 1095static int 1096checkuser(char *fname, char *name, int pwset, char **residue, int *ecode) 1097{ 1098 FILE *fd; 1099 int found = 0; 1100 size_t len; 1101 char *line, *mp, *p; 1102 1103 if (ecode != NULL) 1104 *ecode = 0; 1105 if ((fd = fopen(fname, "r")) != NULL) { 1106 while (!found && (line = fgetln(fd, &len)) != NULL) { 1107 /* skip comments */ 1108 if (line[0] == '#') 1109 continue; 1110 if (line[len - 1] == '\n') { 1111 line[len - 1] = '\0'; 1112 mp = NULL; 1113 } else { 1114 if ((mp = malloc(len + 1)) == NULL) 1115 fatalerror("Ran out of memory."); 1116 memcpy(mp, line, len); 1117 mp[len] = '\0'; 1118 line = mp; 1119 } 1120 /* avoid possible leading and trailing whitespace */ 1121 p = strtok(line, " \t"); 1122 /* skip empty lines */ 1123 if (p == NULL) 1124 goto nextline; 1125 /* 1126 * if first chr is '@', check group membership 1127 */ 1128 if (p[0] == '@') { 1129 int i = 0; 1130 struct group *grp; 1131 1132 if (p[1] == '\0') /* single @ matches anyone */ 1133 found = 1; 1134 else { 1135 if ((grp = getgrnam(p+1)) == NULL) 1136 goto nextline; 1137 /* 1138 * Check user's default group 1139 */ 1140 if (pwset && grp->gr_gid == pw->pw_gid) 1141 found = 1; 1142 /* 1143 * Check supplementary groups 1144 */ 1145 while (!found && grp->gr_mem[i]) 1146 found = strcmp(name, 1147 grp->gr_mem[i++]) 1148 == 0; 1149 } 1150 } 1151 /* 1152 * Otherwise, just check for username match 1153 */ 1154 else 1155 found = strcmp(p, name) == 0; 1156 /* 1157 * Save the rest of line to "residue" if matched 1158 */ 1159 if (found && residue) { 1160 if ((p = strtok(NULL, "")) != NULL) 1161 p += strspn(p, " \t"); 1162 if (p && *p) { 1163 if ((*residue = strdup(p)) == NULL) 1164 fatalerror("Ran out of memory."); 1165 } else 1166 *residue = NULL; 1167 } 1168nextline: 1169 if (mp) 1170 free(mp); 1171 } 1172 (void) fclose(fd); 1173 } else if (ecode != NULL) 1174 *ecode = errno; 1175 return (found); 1176} 1177 1178/* 1179 * Terminate login as previous user, if any, resetting state; 1180 * used when USER command is given or login fails. 1181 */ 1182static void 1183end_login(void) 1184{ 1185#ifdef USE_PAM 1186 int e; 1187#endif 1188 1189 (void) seteuid(0); 1190 if (logged_in && dowtmp) 1191 ftpd_logwtmp(wtmpid, NULL, NULL); 1192 pw = NULL; 1193#ifdef LOGIN_CAP 1194 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 1195 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 1196 LOGIN_SETENV)); 1197#endif 1198#ifdef USE_PAM 1199 if (pamh) { 1200 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1201 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1202 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1203 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1204 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1205 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1206 pamh = NULL; 1207 } 1208#endif 1209 logged_in = 0; 1210 guest = 0; 1211 dochroot = 0; 1212} 1213 1214#ifdef USE_PAM 1215 1216/* 1217 * the following code is stolen from imap-uw PAM authentication module and 1218 * login.c 1219 */ 1220#define COPY_STRING(s) (s ? strdup(s) : NULL) 1221 1222struct cred_t { 1223 const char *uname; /* user name */ 1224 const char *pass; /* password */ 1225}; 1226typedef struct cred_t cred_t; 1227 1228static int 1229auth_conv(int num_msg, const struct pam_message **msg, 1230 struct pam_response **resp, void *appdata) 1231{ 1232 int i; 1233 cred_t *cred = (cred_t *) appdata; 1234 struct pam_response *reply; 1235 1236 reply = calloc(num_msg, sizeof *reply); 1237 if (reply == NULL) 1238 return PAM_BUF_ERR; 1239 1240 for (i = 0; i < num_msg; i++) { 1241 switch (msg[i]->msg_style) { 1242 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1243 reply[i].resp_retcode = PAM_SUCCESS; 1244 reply[i].resp = COPY_STRING(cred->uname); 1245 /* PAM frees resp. */ 1246 break; 1247 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1248 reply[i].resp_retcode = PAM_SUCCESS; 1249 reply[i].resp = COPY_STRING(cred->pass); 1250 /* PAM frees resp. */ 1251 break; 1252 case PAM_TEXT_INFO: 1253 case PAM_ERROR_MSG: 1254 reply[i].resp_retcode = PAM_SUCCESS; 1255 reply[i].resp = NULL; 1256 break; 1257 default: /* unknown message style */ 1258 free(reply); 1259 return PAM_CONV_ERR; 1260 } 1261 } 1262 1263 *resp = reply; 1264 return PAM_SUCCESS; 1265} 1266 1267/* 1268 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1269 * authenticated, or 1 if not authenticated. If some sort of PAM system 1270 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1271 * function returns -1. This can be used as an indication that we should 1272 * fall back to a different authentication mechanism. 1273 */ 1274static int 1275auth_pam(struct passwd **ppw, const char *pass) 1276{ 1277 const char *tmpl_user; 1278 const void *item; 1279 int rval; 1280 int e; 1281 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1282 struct pam_conv conv = { &auth_conv, &auth_cred }; 1283 1284 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1285 if (e != PAM_SUCCESS) { 1286 /* 1287 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1288 * if context creation has failed in the first place. 1289 */ 1290 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1291 return -1; 1292 } 1293 1294 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1295 if (e != PAM_SUCCESS) { 1296 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1297 pam_strerror(pamh, e)); 1298 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1299 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1300 } 1301 pamh = NULL; 1302 return -1; 1303 } 1304 1305 e = pam_authenticate(pamh, 0); 1306 switch (e) { 1307 case PAM_SUCCESS: 1308 /* 1309 * With PAM we support the concept of a "template" 1310 * user. The user enters a login name which is 1311 * authenticated by PAM, usually via a remote service 1312 * such as RADIUS or TACACS+. If authentication 1313 * succeeds, a different but related "template" name 1314 * is used for setting the credentials, shell, and 1315 * home directory. The name the user enters need only 1316 * exist on the remote authentication server, but the 1317 * template name must be present in the local password 1318 * database. 1319 * 1320 * This is supported by two various mechanisms in the 1321 * individual modules. However, from the application's 1322 * point of view, the template user is always passed 1323 * back as a changed value of the PAM_USER item. 1324 */ 1325 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1326 PAM_SUCCESS) { 1327 tmpl_user = (const char *) item; 1328 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1329 *ppw = getpwnam(tmpl_user); 1330 } else 1331 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1332 pam_strerror(pamh, e)); 1333 rval = 0; 1334 break; 1335 1336 case PAM_AUTH_ERR: 1337 case PAM_USER_UNKNOWN: 1338 case PAM_MAXTRIES: 1339 rval = 1; 1340 break; 1341 1342 default: 1343 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1344 rval = -1; 1345 break; 1346 } 1347 1348 if (rval == 0) { 1349 e = pam_acct_mgmt(pamh, 0); 1350 if (e != PAM_SUCCESS) { 1351 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1352 pam_strerror(pamh, e)); 1353 rval = 1; 1354 } 1355 } 1356 1357 if (rval != 0) { 1358 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1359 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1360 } 1361 pamh = NULL; 1362 } 1363 return rval; 1364} 1365 1366#endif /* USE_PAM */ 1367 1368void 1369pass(char *passwd) 1370{ 1371 int rval, ecode; 1372 FILE *fd; 1373#ifdef LOGIN_CAP 1374 login_cap_t *lc = NULL; 1375#endif 1376#ifdef USE_PAM 1377 int e; 1378#endif 1379 char *residue = NULL; 1380 char *xpasswd; 1381 1382 if (logged_in || askpasswd == 0) { 1383 reply(503, "Login with USER first."); 1384 return; 1385 } 1386 askpasswd = 0; 1387 if (!guest) { /* "ftp" is only account allowed no password */ 1388 if (pw == NULL) { 1389 rval = 1; /* failure below */ 1390 goto skip; 1391 } 1392#ifdef USE_PAM 1393 rval = auth_pam(&pw, passwd); 1394 if (rval >= 0) { 1395 opieunlock(); 1396 goto skip; 1397 } 1398#endif 1399 if (opieverify(&opiedata, passwd) == 0) 1400 xpasswd = pw->pw_passwd; 1401 else if (pwok) { 1402 xpasswd = crypt(passwd, pw->pw_passwd); 1403 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1404 xpasswd = ":"; 1405 } else { 1406 rval = 1; 1407 goto skip; 1408 } 1409 rval = strcmp(pw->pw_passwd, xpasswd); 1410 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1411 rval = 1; /* failure */ 1412skip: 1413 /* 1414 * If rval == 1, the user failed the authentication check 1415 * above. If rval == 0, either PAM or local authentication 1416 * succeeded. 1417 */ 1418 if (rval) { 1419 reply(530, "Login incorrect."); 1420 if (logging) { 1421 syslog(LOG_NOTICE, 1422 "FTP LOGIN FAILED FROM %s", 1423 remotehost); 1424 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1425 "FTP LOGIN FAILED FROM %s, %s", 1426 remotehost, curname); 1427 } 1428 pw = NULL; 1429 if (login_attempts++ >= 5) { 1430 syslog(LOG_NOTICE, 1431 "repeated login failures from %s", 1432 remotehost); 1433 exit(0); 1434 } 1435 return; 1436 } 1437 } 1438 login_attempts = 0; /* this time successful */ 1439 if (setegid(pw->pw_gid) < 0) { 1440 reply(550, "Can't set gid."); 1441 return; 1442 } 1443 /* May be overridden by login.conf */ 1444 (void) umask(defumask); 1445#ifdef LOGIN_CAP 1446 if ((lc = login_getpwclass(pw)) != NULL) { 1447 char remote_ip[NI_MAXHOST]; 1448 1449 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1450 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1451 NI_NUMERICHOST)) 1452 *remote_ip = 0; 1453 remote_ip[sizeof(remote_ip) - 1] = 0; 1454 if (!auth_hostok(lc, remotehost, remote_ip)) { 1455 syslog(LOG_INFO|LOG_AUTH, 1456 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1457 pw->pw_name); 1458 reply(530, "Permission denied."); 1459 pw = NULL; 1460 return; 1461 } 1462 if (!auth_timeok(lc, time(NULL))) { 1463 reply(530, "Login not available right now."); 1464 pw = NULL; 1465 return; 1466 } 1467 } 1468 setusercontext(lc, pw, 0, LOGIN_SETALL & 1469 ~(LOGIN_SETUSER | LOGIN_SETPATH | LOGIN_SETENV)); 1470#else 1471 setlogin(pw->pw_name); 1472 (void) initgroups(pw->pw_name, pw->pw_gid); 1473#endif 1474 1475#ifdef USE_PAM 1476 if (pamh) { 1477 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1478 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1479 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1480 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1481 } 1482 } 1483#endif 1484 1485 dochroot = 1486 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue, &ecode) 1487#ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1488 || login_getcapbool(lc, "ftp-chroot", 0) 1489#endif 1490 ; 1491 /* 1492 * It is possible that checkuser() failed to open the chroot file. 1493 * If this is the case, report that logins are un-available, since we 1494 * have no way of checking whether or not the user should be chrooted. 1495 * We ignore ENOENT since it is not required that this file be present. 1496 */ 1497 if (ecode != 0 && ecode != ENOENT) { 1498 reply(530, "Login not available right now."); 1499 return; 1500 } 1501 chrootdir = NULL; 1502 1503 /* Disable wtmp logging when chrooting. */ 1504 if (dochroot || guest) 1505 dowtmp = 0; 1506 if (dowtmp) 1507 ftpd_logwtmp(wtmpid, pw->pw_name, 1508 (struct sockaddr *)&his_addr); 1509 logged_in = 1; 1510 1511 if (guest && stats && statfd < 0) 1512#ifdef VIRTUAL_HOSTING 1513 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1514#else 1515 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1516#endif 1517 if (statfd < 0) 1518 stats = 0; 1519 1520 /* 1521 * For a chrooted local user, 1522 * a) see whether ftpchroot(5) specifies a chroot directory, 1523 * b) extract the directory pathname from the line, 1524 * c) expand it to the absolute pathname if necessary. 1525 */ 1526 if (dochroot && residue && 1527 (chrootdir = strtok(residue, " \t")) != NULL) { 1528 if (chrootdir[0] != '/') 1529 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1530 else 1531 chrootdir = strdup(chrootdir); /* make it permanent */ 1532 if (chrootdir == NULL) 1533 fatalerror("Ran out of memory."); 1534 } 1535 if (guest || dochroot) { 1536 /* 1537 * If no chroot directory set yet, use the login directory. 1538 * Copy it so it can be modified while pw->pw_dir stays intact. 1539 */ 1540 if (chrootdir == NULL && 1541 (chrootdir = strdup(pw->pw_dir)) == NULL) 1542 fatalerror("Ran out of memory."); 1543 /* 1544 * Check for the "/chroot/./home" syntax, 1545 * separate the chroot and home directory pathnames. 1546 */ 1547 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1548 *(homedir++) = '\0'; /* wipe '/' */ 1549 homedir++; /* skip '.' */ 1550 } else { 1551 /* 1552 * We MUST do a chdir() after the chroot. Otherwise 1553 * the old current directory will be accessible as "." 1554 * outside the new root! 1555 */ 1556 homedir = "/"; 1557 } 1558 /* 1559 * Finally, do chroot() 1560 */ 1561 if (chroot(chrootdir) < 0) { 1562 reply(550, "Can't change root."); 1563 goto bad; 1564 } 1565 __FreeBSD_libc_enter_restricted_mode(); 1566 } else /* real user w/o chroot */ 1567 homedir = pw->pw_dir; 1568 /* 1569 * Set euid *before* doing chdir() so 1570 * a) the user won't be carried to a directory that he couldn't reach 1571 * on his own due to no permission to upper path components, 1572 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1573 * (uid 0 has no root power over NFS if not mapped explicitly.) 1574 */ 1575 if (seteuid(pw->pw_uid) < 0) { 1576 reply(550, "Can't set uid."); 1577 goto bad; 1578 } 1579 if (chdir(homedir) < 0) { 1580 if (guest || dochroot) { 1581 reply(550, "Can't change to base directory."); 1582 goto bad; 1583 } else { 1584 if (chdir("/") < 0) { 1585 reply(550, "Root is inaccessible."); 1586 goto bad; 1587 } 1588 lreply(230, "No directory! Logging in with home=/."); 1589 } 1590 } 1591 1592 /* 1593 * Display a login message, if it exists. 1594 * N.B. reply(230,) must follow the message. 1595 */ 1596#ifdef VIRTUAL_HOSTING 1597 fd = fopen(thishost->loginmsg, "r"); 1598#else 1599 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1600#endif 1601 if (fd != NULL) { 1602 char *cp, line[LINE_MAX]; 1603 1604 while (fgets(line, sizeof(line), fd) != NULL) { 1605 if ((cp = strchr(line, '\n')) != NULL) 1606 *cp = '\0'; 1607 lreply(230, "%s", line); 1608 } 1609 (void) fflush(stdout); 1610 (void) fclose(fd); 1611 } 1612 if (guest) { 1613 if (ident != NULL) 1614 free(ident); 1615 ident = strdup(passwd); 1616 if (ident == NULL) 1617 fatalerror("Ran out of memory."); 1618 1619 reply(230, "Guest login ok, access restrictions apply."); 1620#ifdef SETPROCTITLE 1621#ifdef VIRTUAL_HOSTING 1622 if (thishost != firsthost) 1623 snprintf(proctitle, sizeof(proctitle), 1624 "%s: anonymous(%s)/%s", remotehost, hostname, 1625 passwd); 1626 else 1627#endif 1628 snprintf(proctitle, sizeof(proctitle), 1629 "%s: anonymous/%s", remotehost, passwd); 1630 setproctitle("%s", proctitle); 1631#endif /* SETPROCTITLE */ 1632 if (logging) 1633 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1634 remotehost, passwd); 1635 } else { 1636 if (dochroot) 1637 reply(230, "User %s logged in, " 1638 "access restrictions apply.", pw->pw_name); 1639 else 1640 reply(230, "User %s logged in.", pw->pw_name); 1641 1642#ifdef SETPROCTITLE 1643 snprintf(proctitle, sizeof(proctitle), 1644 "%s: user/%s", remotehost, pw->pw_name); 1645 setproctitle("%s", proctitle); 1646#endif /* SETPROCTITLE */ 1647 if (logging) 1648 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1649 remotehost, pw->pw_name); 1650 } 1651 if (logging && (guest || dochroot)) 1652 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1653#ifdef LOGIN_CAP 1654 login_close(lc); 1655#endif 1656 if (residue) 1657 free(residue); 1658 return; 1659bad: 1660 /* Forget all about it... */ 1661#ifdef LOGIN_CAP 1662 login_close(lc); 1663#endif 1664 if (residue) 1665 free(residue); 1666 end_login(); 1667} 1668 1669void 1670retrieve(char *cmd, char *name) 1671{ 1672 FILE *fin, *dout; 1673 struct stat st; 1674 int (*closefunc)(FILE *); 1675 time_t start; 1676 1677 if (cmd == 0) { 1678 fin = fopen(name, "r"), closefunc = fclose; 1679 st.st_size = 0; 1680 } else { 1681 char line[BUFSIZ]; 1682 1683 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1684 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1685 st.st_size = -1; 1686 st.st_blksize = BUFSIZ; 1687 } 1688 if (fin == NULL) { 1689 if (errno != 0) { 1690 perror_reply(550, name); 1691 if (cmd == 0) { 1692 LOGCMD("get", name); 1693 } 1694 } 1695 return; 1696 } 1697 byte_count = -1; 1698 if (cmd == 0) { 1699 if (fstat(fileno(fin), &st) < 0) { 1700 perror_reply(550, name); 1701 goto done; 1702 } 1703 if (!S_ISREG(st.st_mode)) { 1704 /* 1705 * Never sending a raw directory is a workaround 1706 * for buggy clients that will attempt to RETR 1707 * a directory before listing it, e.g., Mozilla. 1708 * Preventing a guest from getting irregular files 1709 * is a simple security measure. 1710 */ 1711 if (S_ISDIR(st.st_mode) || guest) { 1712 reply(550, "%s: not a plain file.", name); 1713 goto done; 1714 } 1715 st.st_size = -1; 1716 /* st.st_blksize is set for all descriptor types */ 1717 } 1718 } 1719 if (restart_point) { 1720 if (type == TYPE_A) { 1721 off_t i, n; 1722 int c; 1723 1724 n = restart_point; 1725 i = 0; 1726 while (i++ < n) { 1727 if ((c=getc(fin)) == EOF) { 1728 perror_reply(550, name); 1729 goto done; 1730 } 1731 if (c == '\n') 1732 i++; 1733 } 1734 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1735 perror_reply(550, name); 1736 goto done; 1737 } 1738 } 1739 dout = dataconn(name, st.st_size, "w"); 1740 if (dout == NULL) 1741 goto done; 1742 time(&start); 1743 send_data(fin, dout, st.st_blksize, st.st_size, 1744 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1745 if (cmd == 0 && guest && stats && byte_count > 0) 1746 logxfer(name, byte_count, start); 1747 (void) fclose(dout); 1748 data = -1; 1749 pdata = -1; 1750done: 1751 if (cmd == 0) 1752 LOGBYTES("get", name, byte_count); 1753 (*closefunc)(fin); 1754} 1755 1756void 1757store(char *name, char *mode, int unique) 1758{ 1759 int fd; 1760 FILE *fout, *din; 1761 int (*closefunc)(FILE *); 1762 1763 if (*mode == 'a') { /* APPE */ 1764 if (unique) { 1765 /* Programming error */ 1766 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1767 unique = 0; 1768 } 1769 if (guest && noguestmod) { 1770 reply(550, "Appending to existing file denied."); 1771 goto err; 1772 } 1773 restart_point = 0; /* not affected by preceding REST */ 1774 } 1775 if (unique) /* STOU overrides REST */ 1776 restart_point = 0; 1777 if (guest && noguestmod) { 1778 if (restart_point) { /* guest STOR w/REST */ 1779 reply(550, "Modifying existing file denied."); 1780 goto err; 1781 } else /* treat guest STOR as STOU */ 1782 unique = 1; 1783 } 1784 1785 if (restart_point) 1786 mode = "r+"; /* so ASCII manual seek can work */ 1787 if (unique) { 1788 if ((fd = guniquefd(name, &name)) < 0) 1789 goto err; 1790 fout = fdopen(fd, mode); 1791 } else 1792 fout = fopen(name, mode); 1793 closefunc = fclose; 1794 if (fout == NULL) { 1795 perror_reply(553, name); 1796 goto err; 1797 } 1798 byte_count = -1; 1799 if (restart_point) { 1800 if (type == TYPE_A) { 1801 off_t i, n; 1802 int c; 1803 1804 n = restart_point; 1805 i = 0; 1806 while (i++ < n) { 1807 if ((c=getc(fout)) == EOF) { 1808 perror_reply(550, name); 1809 goto done; 1810 } 1811 if (c == '\n') 1812 i++; 1813 } 1814 /* 1815 * We must do this seek to "current" position 1816 * because we are changing from reading to 1817 * writing. 1818 */ 1819 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1820 perror_reply(550, name); 1821 goto done; 1822 } 1823 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1824 perror_reply(550, name); 1825 goto done; 1826 } 1827 } 1828 din = dataconn(name, -1, "r"); 1829 if (din == NULL) 1830 goto done; 1831 if (receive_data(din, fout) == 0) { 1832 if (unique) 1833 reply(226, "Transfer complete (unique file name:%s).", 1834 name); 1835 else 1836 reply(226, "Transfer complete."); 1837 } 1838 (void) fclose(din); 1839 data = -1; 1840 pdata = -1; 1841done: 1842 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1843 (*closefunc)(fout); 1844 return; 1845err: 1846 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1847 return; 1848} 1849 1850static FILE * 1851getdatasock(char *mode) 1852{ 1853 int on = 1, s, t, tries; 1854 1855 if (data >= 0) 1856 return (fdopen(data, mode)); 1857 1858 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1859 if (s < 0) 1860 goto bad; 1861 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1862 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1863 /* anchor socket to avoid multi-homing problems */ 1864 data_source = ctrl_addr; 1865 data_source.su_port = htons(dataport); 1866 (void) seteuid(0); 1867 for (tries = 1; ; tries++) { 1868 /* 1869 * We should loop here since it's possible that 1870 * another ftpd instance has passed this point and is 1871 * trying to open a data connection in active mode now. 1872 * Until the other connection is opened, we'll be getting 1873 * EADDRINUSE because no SOCK_STREAM sockets in the system 1874 * can share both local and remote addresses, localIP:20 1875 * and *:* in this case. 1876 */ 1877 if (bind(s, (struct sockaddr *)&data_source, 1878 data_source.su_len) >= 0) 1879 break; 1880 if (errno != EADDRINUSE || tries > 10) 1881 goto bad; 1882 sleep(tries); 1883 } 1884 (void) seteuid(pw->pw_uid); 1885#ifdef IP_TOS 1886 if (data_source.su_family == AF_INET) 1887 { 1888 on = IPTOS_THROUGHPUT; 1889 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1890 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1891 } 1892#endif 1893#ifdef TCP_NOPUSH 1894 /* 1895 * Turn off push flag to keep sender TCP from sending short packets 1896 * at the boundaries of each write(). 1897 */ 1898 on = 1; 1899 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1900 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1901#endif 1902 return (fdopen(s, mode)); 1903bad: 1904 /* Return the real value of errno (close may change it) */ 1905 t = errno; 1906 (void) seteuid(pw->pw_uid); 1907 (void) close(s); 1908 errno = t; 1909 return (NULL); 1910} 1911 1912static FILE * 1913dataconn(char *name, off_t size, char *mode) 1914{ 1915 char sizebuf[32]; 1916 FILE *file; 1917 int retry = 0, tos, conerrno; 1918 1919 file_size = size; 1920 byte_count = 0; 1921 if (size != -1) 1922 (void) snprintf(sizebuf, sizeof(sizebuf), 1923 " (%jd bytes)", (intmax_t)size); 1924 else 1925 *sizebuf = '\0'; 1926 if (pdata >= 0) { 1927 union sockunion from; 1928 socklen_t fromlen = ctrl_addr.su_len; 1929 int flags, s; 1930 struct timeval timeout; 1931 fd_set set; 1932 1933 FD_ZERO(&set); 1934 FD_SET(pdata, &set); 1935 1936 timeout.tv_usec = 0; 1937 timeout.tv_sec = 120; 1938 1939 /* 1940 * Granted a socket is in the blocking I/O mode, 1941 * accept() will block after a successful select() 1942 * if the selected connection dies in between. 1943 * Therefore set the non-blocking I/O flag here. 1944 */ 1945 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1946 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1947 goto pdata_err; 1948 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1949 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1950 goto pdata_err; 1951 (void) close(pdata); 1952 pdata = s; 1953 /* 1954 * Unset the inherited non-blocking I/O flag 1955 * on the child socket so stdio can work on it. 1956 */ 1957 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1958 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1959 goto pdata_err; 1960#ifdef IP_TOS 1961 if (from.su_family == AF_INET) 1962 { 1963 tos = IPTOS_THROUGHPUT; 1964 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1965 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1966 } 1967#endif 1968 reply(150, "Opening %s mode data connection for '%s'%s.", 1969 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1970 return (fdopen(pdata, mode)); 1971pdata_err: 1972 reply(425, "Can't open data connection."); 1973 (void) close(pdata); 1974 pdata = -1; 1975 return (NULL); 1976 } 1977 if (data >= 0) { 1978 reply(125, "Using existing data connection for '%s'%s.", 1979 name, sizebuf); 1980 usedefault = 1; 1981 return (fdopen(data, mode)); 1982 } 1983 if (usedefault) 1984 data_dest = his_addr; 1985 usedefault = 1; 1986 do { 1987 file = getdatasock(mode); 1988 if (file == NULL) { 1989 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1990 1991 if (getnameinfo((struct sockaddr *)&data_source, 1992 data_source.su_len, 1993 hostbuf, sizeof(hostbuf) - 1, 1994 portbuf, sizeof(portbuf) - 1, 1995 NI_NUMERICHOST|NI_NUMERICSERV)) 1996 *hostbuf = *portbuf = 0; 1997 hostbuf[sizeof(hostbuf) - 1] = 0; 1998 portbuf[sizeof(portbuf) - 1] = 0; 1999 reply(425, "Can't create data socket (%s,%s): %s.", 2000 hostbuf, portbuf, strerror(errno)); 2001 return (NULL); 2002 } 2003 data = fileno(file); 2004 conerrno = 0; 2005 if (connect(data, (struct sockaddr *)&data_dest, 2006 data_dest.su_len) == 0) 2007 break; 2008 conerrno = errno; 2009 (void) fclose(file); 2010 data = -1; 2011 if (conerrno == EADDRINUSE) { 2012 sleep(swaitint); 2013 retry += swaitint; 2014 } else { 2015 break; 2016 } 2017 } while (retry <= swaitmax); 2018 if (conerrno != 0) { 2019 reply(425, "Can't build data connection: %s.", 2020 strerror(conerrno)); 2021 return (NULL); 2022 } 2023 reply(150, "Opening %s mode data connection for '%s'%s.", 2024 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2025 return (file); 2026} 2027 2028/* 2029 * A helper macro to avoid code duplication 2030 * in send_data() and receive_data(). 2031 * 2032 * XXX We have to block SIGURG during putc() because BSD stdio 2033 * is unable to restart interrupted write operations and hence 2034 * the entire buffer contents will be lost as soon as a write() 2035 * call indicates EINTR to stdio. 2036 */ 2037#define FTPD_PUTC(ch, file, label) \ 2038 do { \ 2039 int ret; \ 2040 \ 2041 do { \ 2042 START_UNSAFE; \ 2043 ret = putc((ch), (file)); \ 2044 END_UNSAFE; \ 2045 CHECKOOB(return (-1)) \ 2046 else if (ferror(file)) \ 2047 goto label; \ 2048 clearerr(file); \ 2049 } while (ret == EOF); \ 2050 } while (0) 2051 2052/* 2053 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2054 * encapsulation of the data subject to Mode, Structure, and Type. 2055 * 2056 * NB: Form isn't handled. 2057 */ 2058static int 2059send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2060{ 2061 int c, cp, filefd, netfd; 2062 char *buf; 2063 2064 STARTXFER; 2065 2066 switch (type) { 2067 2068 case TYPE_A: 2069 cp = EOF; 2070 for (;;) { 2071 c = getc(instr); 2072 CHECKOOB(return (-1)) 2073 else if (c == EOF && ferror(instr)) 2074 goto file_err; 2075 if (c == EOF) { 2076 if (ferror(instr)) { /* resume after OOB */ 2077 clearerr(instr); 2078 continue; 2079 } 2080 if (feof(instr)) /* EOF */ 2081 break; 2082 syslog(LOG_ERR, "Internal: impossible condition" 2083 " on file after getc()"); 2084 goto file_err; 2085 } 2086 if (c == '\n' && cp != '\r') { 2087 FTPD_PUTC('\r', outstr, data_err); 2088 byte_count++; 2089 } 2090 FTPD_PUTC(c, outstr, data_err); 2091 byte_count++; 2092 cp = c; 2093 } 2094#ifdef notyet /* BSD stdio isn't ready for that */ 2095 while (fflush(outstr) == EOF) { 2096 CHECKOOB(return (-1)) 2097 else 2098 goto data_err; 2099 clearerr(outstr); 2100 } 2101 ENDXFER; 2102#else 2103 ENDXFER; 2104 if (fflush(outstr) == EOF) 2105 goto data_err; 2106#endif 2107 reply(226, "Transfer complete."); 2108 return (0); 2109 2110 case TYPE_I: 2111 case TYPE_L: 2112 /* 2113 * isreg is only set if we are not doing restart and we 2114 * are sending a regular file 2115 */ 2116 netfd = fileno(outstr); 2117 filefd = fileno(instr); 2118 2119 if (isreg) { 2120 char *msg = "Transfer complete."; 2121 off_t cnt, offset; 2122 int err; 2123 2124 cnt = offset = 0; 2125 2126 while (filesize > 0) { 2127 err = sendfile(filefd, netfd, offset, 0, 2128 NULL, &cnt, 0); 2129 /* 2130 * Calculate byte_count before OOB processing. 2131 * It can be used in myoob() later. 2132 */ 2133 byte_count += cnt; 2134 offset += cnt; 2135 filesize -= cnt; 2136 CHECKOOB(return (-1)) 2137 else if (err == -1) { 2138 if (errno != EINTR && 2139 cnt == 0 && offset == 0) 2140 goto oldway; 2141 goto data_err; 2142 } 2143 if (err == -1) /* resume after OOB */ 2144 continue; 2145 /* 2146 * We hit the EOF prematurely. 2147 * Perhaps the file was externally truncated. 2148 */ 2149 if (cnt == 0) { 2150 msg = "Transfer finished due to " 2151 "premature end of file."; 2152 break; 2153 } 2154 } 2155 ENDXFER; 2156 reply(226, "%s", msg); 2157 return (0); 2158 } 2159 2160oldway: 2161 if ((buf = malloc(blksize)) == NULL) { 2162 ENDXFER; 2163 reply(451, "Ran out of memory."); 2164 return (-1); 2165 } 2166 2167 for (;;) { 2168 int cnt, len; 2169 char *bp; 2170 2171 cnt = read(filefd, buf, blksize); 2172 CHECKOOB(free(buf); return (-1)) 2173 else if (cnt < 0) { 2174 free(buf); 2175 goto file_err; 2176 } 2177 if (cnt < 0) /* resume after OOB */ 2178 continue; 2179 if (cnt == 0) /* EOF */ 2180 break; 2181 for (len = cnt, bp = buf; len > 0;) { 2182 cnt = write(netfd, bp, len); 2183 CHECKOOB(free(buf); return (-1)) 2184 else if (cnt < 0) { 2185 free(buf); 2186 goto data_err; 2187 } 2188 if (cnt <= 0) 2189 continue; 2190 len -= cnt; 2191 bp += cnt; 2192 byte_count += cnt; 2193 } 2194 } 2195 ENDXFER; 2196 free(buf); 2197 reply(226, "Transfer complete."); 2198 return (0); 2199 default: 2200 ENDXFER; 2201 reply(550, "Unimplemented TYPE %d in send_data.", type); 2202 return (-1); 2203 } 2204 2205data_err: 2206 ENDXFER; 2207 perror_reply(426, "Data connection"); 2208 return (-1); 2209 2210file_err: 2211 ENDXFER; 2212 perror_reply(551, "Error on input file"); 2213 return (-1); 2214} 2215 2216/* 2217 * Transfer data from peer to "outstr" using the appropriate encapulation of 2218 * the data subject to Mode, Structure, and Type. 2219 * 2220 * N.B.: Form isn't handled. 2221 */ 2222static int 2223receive_data(FILE *instr, FILE *outstr) 2224{ 2225 int c, cp; 2226 int bare_lfs = 0; 2227 2228 STARTXFER; 2229 2230 switch (type) { 2231 2232 case TYPE_I: 2233 case TYPE_L: 2234 for (;;) { 2235 int cnt, len; 2236 char *bp; 2237 char buf[BUFSIZ]; 2238 2239 cnt = read(fileno(instr), buf, sizeof(buf)); 2240 CHECKOOB(return (-1)) 2241 else if (cnt < 0) 2242 goto data_err; 2243 if (cnt < 0) /* resume after OOB */ 2244 continue; 2245 if (cnt == 0) /* EOF */ 2246 break; 2247 for (len = cnt, bp = buf; len > 0;) { 2248 cnt = write(fileno(outstr), bp, len); 2249 CHECKOOB(return (-1)) 2250 else if (cnt < 0) 2251 goto file_err; 2252 if (cnt <= 0) 2253 continue; 2254 len -= cnt; 2255 bp += cnt; 2256 byte_count += cnt; 2257 } 2258 } 2259 ENDXFER; 2260 return (0); 2261 2262 case TYPE_E: 2263 ENDXFER; 2264 reply(553, "TYPE E not implemented."); 2265 return (-1); 2266 2267 case TYPE_A: 2268 cp = EOF; 2269 for (;;) { 2270 c = getc(instr); 2271 CHECKOOB(return (-1)) 2272 else if (c == EOF && ferror(instr)) 2273 goto data_err; 2274 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2275 clearerr(instr); 2276 continue; 2277 } 2278 2279 if (cp == '\r') { 2280 if (c != '\n') 2281 FTPD_PUTC('\r', outstr, file_err); 2282 } else 2283 if (c == '\n') 2284 bare_lfs++; 2285 if (c == '\r') { 2286 byte_count++; 2287 cp = c; 2288 continue; 2289 } 2290 2291 /* Check for EOF here in order not to lose last \r. */ 2292 if (c == EOF) { 2293 if (feof(instr)) /* EOF */ 2294 break; 2295 syslog(LOG_ERR, "Internal: impossible condition" 2296 " on data stream after getc()"); 2297 goto data_err; 2298 } 2299 2300 byte_count++; 2301 FTPD_PUTC(c, outstr, file_err); 2302 cp = c; 2303 } 2304#ifdef notyet /* BSD stdio isn't ready for that */ 2305 while (fflush(outstr) == EOF) { 2306 CHECKOOB(return (-1)) 2307 else 2308 goto file_err; 2309 clearerr(outstr); 2310 } 2311 ENDXFER; 2312#else 2313 ENDXFER; 2314 if (fflush(outstr) == EOF) 2315 goto file_err; 2316#endif 2317 if (bare_lfs) { 2318 lreply(226, 2319 "WARNING! %d bare linefeeds received in ASCII mode.", 2320 bare_lfs); 2321 (void)printf(" File may not have transferred correctly.\r\n"); 2322 } 2323 return (0); 2324 default: 2325 ENDXFER; 2326 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2327 return (-1); 2328 } 2329 2330data_err: 2331 ENDXFER; 2332 perror_reply(426, "Data connection"); 2333 return (-1); 2334 2335file_err: 2336 ENDXFER; 2337 perror_reply(452, "Error writing to file"); 2338 return (-1); 2339} 2340 2341void 2342statfilecmd(char *filename) 2343{ 2344 FILE *fin; 2345 int atstart; 2346 int c, code; 2347 char line[LINE_MAX]; 2348 struct stat st; 2349 2350 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2351 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2352 fin = ftpd_popen(line, "r"); 2353 if (fin == NULL) { 2354 perror_reply(551, filename); 2355 return; 2356 } 2357 lreply(code, "Status of %s:", filename); 2358 atstart = 1; 2359 while ((c = getc(fin)) != EOF) { 2360 if (c == '\n') { 2361 if (ferror(stdout)){ 2362 perror_reply(421, "Control connection"); 2363 (void) ftpd_pclose(fin); 2364 dologout(1); 2365 /* NOTREACHED */ 2366 } 2367 if (ferror(fin)) { 2368 perror_reply(551, filename); 2369 (void) ftpd_pclose(fin); 2370 return; 2371 } 2372 (void) putc('\r', stdout); 2373 } 2374 /* 2375 * RFC 959 says neutral text should be prepended before 2376 * a leading 3-digit number followed by whitespace, but 2377 * many ftp clients can be confused by any leading digits, 2378 * as a matter of fact. 2379 */ 2380 if (atstart && isdigit(c)) 2381 (void) putc(' ', stdout); 2382 (void) putc(c, stdout); 2383 atstart = (c == '\n'); 2384 } 2385 (void) ftpd_pclose(fin); 2386 reply(code, "End of status."); 2387} 2388 2389void 2390statcmd(void) 2391{ 2392 union sockunion *su; 2393 u_char *a, *p; 2394 char hname[NI_MAXHOST]; 2395 int ispassive; 2396 2397 if (hostinfo) { 2398 lreply(211, "%s FTP server status:", hostname); 2399 printf(" %s\r\n", version); 2400 } else 2401 lreply(211, "FTP server status:"); 2402 printf(" Connected to %s", remotehost); 2403 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2404 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2405 hname[sizeof(hname) - 1] = 0; 2406 if (strcmp(hname, remotehost) != 0) 2407 printf(" (%s)", hname); 2408 } 2409 printf("\r\n"); 2410 if (logged_in) { 2411 if (guest) 2412 printf(" Logged in anonymously\r\n"); 2413 else 2414 printf(" Logged in as %s\r\n", pw->pw_name); 2415 } else if (askpasswd) 2416 printf(" Waiting for password\r\n"); 2417 else 2418 printf(" Waiting for user name\r\n"); 2419 printf(" TYPE: %s", typenames[type]); 2420 if (type == TYPE_A || type == TYPE_E) 2421 printf(", FORM: %s", formnames[form]); 2422 if (type == TYPE_L) 2423#if CHAR_BIT == 8 2424 printf(" %d", CHAR_BIT); 2425#else 2426 printf(" %d", bytesize); /* need definition! */ 2427#endif 2428 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2429 strunames[stru], modenames[mode]); 2430 if (data != -1) 2431 printf(" Data connection open\r\n"); 2432 else if (pdata != -1) { 2433 ispassive = 1; 2434 su = &pasv_addr; 2435 goto printaddr; 2436 } else if (usedefault == 0) { 2437 ispassive = 0; 2438 su = &data_dest; 2439printaddr: 2440#define UC(b) (((int) b) & 0xff) 2441 if (epsvall) { 2442 printf(" EPSV only mode (EPSV ALL)\r\n"); 2443 goto epsvonly; 2444 } 2445 2446 /* PORT/PASV */ 2447 if (su->su_family == AF_INET) { 2448 a = (u_char *) &su->su_sin.sin_addr; 2449 p = (u_char *) &su->su_sin.sin_port; 2450 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2451 ispassive ? "PASV" : "PORT", 2452 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2453 UC(p[0]), UC(p[1])); 2454 } 2455 2456 /* LPRT/LPSV */ 2457 { 2458 int alen, af, i; 2459 2460 switch (su->su_family) { 2461 case AF_INET: 2462 a = (u_char *) &su->su_sin.sin_addr; 2463 p = (u_char *) &su->su_sin.sin_port; 2464 alen = sizeof(su->su_sin.sin_addr); 2465 af = 4; 2466 break; 2467 case AF_INET6: 2468 a = (u_char *) &su->su_sin6.sin6_addr; 2469 p = (u_char *) &su->su_sin6.sin6_port; 2470 alen = sizeof(su->su_sin6.sin6_addr); 2471 af = 6; 2472 break; 2473 default: 2474 af = 0; 2475 break; 2476 } 2477 if (af) { 2478 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2479 af, alen); 2480 for (i = 0; i < alen; i++) 2481 printf("%d,", UC(a[i])); 2482 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2483 } 2484 } 2485 2486epsvonly:; 2487 /* EPRT/EPSV */ 2488 { 2489 int af; 2490 2491 switch (su->su_family) { 2492 case AF_INET: 2493 af = 1; 2494 break; 2495 case AF_INET6: 2496 af = 2; 2497 break; 2498 default: 2499 af = 0; 2500 break; 2501 } 2502 if (af) { 2503 union sockunion tmp; 2504 2505 tmp = *su; 2506 if (tmp.su_family == AF_INET6) 2507 tmp.su_sin6.sin6_scope_id = 0; 2508 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2509 hname, sizeof(hname) - 1, NULL, 0, 2510 NI_NUMERICHOST)) { 2511 hname[sizeof(hname) - 1] = 0; 2512 printf(" %s |%d|%s|%d|\r\n", 2513 ispassive ? "EPSV" : "EPRT", 2514 af, hname, htons(tmp.su_port)); 2515 } 2516 } 2517 } 2518#undef UC 2519 } else 2520 printf(" No data connection\r\n"); 2521 reply(211, "End of status."); 2522} 2523 2524void 2525fatalerror(char *s) 2526{ 2527 2528 reply(451, "Error in server: %s", s); 2529 reply(221, "Closing connection due to server error."); 2530 dologout(0); 2531 /* NOTREACHED */ 2532} 2533 2534void 2535reply(int n, const char *fmt, ...) 2536{ 2537 va_list ap; 2538 2539 (void)printf("%d ", n); 2540 va_start(ap, fmt); 2541 (void)vprintf(fmt, ap); 2542 va_end(ap); 2543 (void)printf("\r\n"); 2544 (void)fflush(stdout); 2545 if (ftpdebug) { 2546 syslog(LOG_DEBUG, "<--- %d ", n); 2547 va_start(ap, fmt); 2548 vsyslog(LOG_DEBUG, fmt, ap); 2549 va_end(ap); 2550 } 2551} 2552 2553void 2554lreply(int n, const char *fmt, ...) 2555{ 2556 va_list ap; 2557 2558 (void)printf("%d- ", n); 2559 va_start(ap, fmt); 2560 (void)vprintf(fmt, ap); 2561 va_end(ap); 2562 (void)printf("\r\n"); 2563 (void)fflush(stdout); 2564 if (ftpdebug) { 2565 syslog(LOG_DEBUG, "<--- %d- ", n); 2566 va_start(ap, fmt); 2567 vsyslog(LOG_DEBUG, fmt, ap); 2568 va_end(ap); 2569 } 2570} 2571 2572static void 2573ack(char *s) 2574{ 2575 2576 reply(250, "%s command successful.", s); 2577} 2578 2579void 2580nack(char *s) 2581{ 2582 2583 reply(502, "%s command not implemented.", s); 2584} 2585 2586/* ARGSUSED */ 2587void 2588yyerror(char *s) 2589{ 2590 char *cp; 2591 2592 if ((cp = strchr(cbuf,'\n'))) 2593 *cp = '\0'; 2594 reply(500, "%s: command not understood.", cbuf); 2595} 2596 2597void 2598delete(char *name) 2599{ 2600 struct stat st; 2601 2602 LOGCMD("delete", name); 2603 if (lstat(name, &st) < 0) { 2604 perror_reply(550, name); 2605 return; 2606 } 2607 if (S_ISDIR(st.st_mode)) { 2608 if (rmdir(name) < 0) { 2609 perror_reply(550, name); 2610 return; 2611 } 2612 goto done; 2613 } 2614 if (guest && noguestmod) { 2615 reply(550, "Operation not permitted."); 2616 return; 2617 } 2618 if (unlink(name) < 0) { 2619 perror_reply(550, name); 2620 return; 2621 } 2622done: 2623 ack("DELE"); 2624} 2625 2626void 2627cwd(char *path) 2628{ 2629 2630 if (chdir(path) < 0) 2631 perror_reply(550, path); 2632 else 2633 ack("CWD"); 2634} 2635 2636void 2637makedir(char *name) 2638{ 2639 char *s; 2640 2641 LOGCMD("mkdir", name); 2642 if (guest && noguestmkd) 2643 reply(550, "Operation not permitted."); 2644 else if (mkdir(name, 0777) < 0) 2645 perror_reply(550, name); 2646 else { 2647 if ((s = doublequote(name)) == NULL) 2648 fatalerror("Ran out of memory."); 2649 reply(257, "\"%s\" directory created.", s); 2650 free(s); 2651 } 2652} 2653 2654void 2655removedir(char *name) 2656{ 2657 2658 LOGCMD("rmdir", name); 2659 if (rmdir(name) < 0) 2660 perror_reply(550, name); 2661 else 2662 ack("RMD"); 2663} 2664 2665void 2666pwd(void) 2667{ 2668 char *s, path[MAXPATHLEN + 1]; 2669 2670 if (getcwd(path, sizeof(path)) == NULL) 2671 perror_reply(550, "Get current directory"); 2672 else { 2673 if ((s = doublequote(path)) == NULL) 2674 fatalerror("Ran out of memory."); 2675 reply(257, "\"%s\" is current directory.", s); 2676 free(s); 2677 } 2678} 2679 2680char * 2681renamefrom(char *name) 2682{ 2683 struct stat st; 2684 2685 if (guest && noguestmod) { 2686 reply(550, "Operation not permitted."); 2687 return (NULL); 2688 } 2689 if (lstat(name, &st) < 0) { 2690 perror_reply(550, name); 2691 return (NULL); 2692 } 2693 reply(350, "File exists, ready for destination name."); 2694 return (name); 2695} 2696 2697void 2698renamecmd(char *from, char *to) 2699{ 2700 struct stat st; 2701 2702 LOGCMD2("rename", from, to); 2703 2704 if (guest && (stat(to, &st) == 0)) { 2705 reply(550, "%s: permission denied.", to); 2706 return; 2707 } 2708 2709 if (rename(from, to) < 0) 2710 perror_reply(550, "rename"); 2711 else 2712 ack("RNTO"); 2713} 2714 2715static void 2716dolog(struct sockaddr *who) 2717{ 2718 char who_name[NI_MAXHOST]; 2719 2720 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2721 remotehost[sizeof(remotehost) - 1] = 0; 2722 if (getnameinfo(who, who->sa_len, 2723 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2724 *who_name = 0; 2725 who_name[sizeof(who_name) - 1] = 0; 2726 2727#ifdef SETPROCTITLE 2728#ifdef VIRTUAL_HOSTING 2729 if (thishost != firsthost) 2730 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2731 remotehost, hostname); 2732 else 2733#endif 2734 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2735 remotehost); 2736 setproctitle("%s", proctitle); 2737#endif /* SETPROCTITLE */ 2738 2739 if (logging) { 2740#ifdef VIRTUAL_HOSTING 2741 if (thishost != firsthost) 2742 syslog(LOG_INFO, "connection from %s (%s) to %s", 2743 remotehost, who_name, hostname); 2744 else 2745#endif 2746 syslog(LOG_INFO, "connection from %s (%s)", 2747 remotehost, who_name); 2748 } 2749} 2750 2751/* 2752 * Record logout in wtmp file 2753 * and exit with supplied status. 2754 */ 2755void 2756dologout(int status) 2757{ 2758 2759 if (logged_in && dowtmp) { 2760 (void) seteuid(0); 2761 ftpd_logwtmp(wtmpid, NULL, NULL); 2762 } 2763 /* beware of flushing buffers after a SIGPIPE */ 2764 _exit(status); 2765} 2766 2767static void 2768sigurg(int signo) 2769{ 2770 2771 recvurg = 1; 2772} 2773 2774static void 2775maskurg(int flag) 2776{ 2777 int oerrno; 2778 sigset_t sset; 2779 2780 if (!transflag) { 2781 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2782 return; 2783 } 2784 oerrno = errno; 2785 sigemptyset(&sset); 2786 sigaddset(&sset, SIGURG); 2787 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2788 errno = oerrno; 2789} 2790 2791static void 2792flagxfer(int flag) 2793{ 2794 2795 if (flag) { 2796 if (transflag) 2797 syslog(LOG_ERR, "Internal: flagxfer(1): " 2798 "transfer already under way"); 2799 transflag = 1; 2800 maskurg(0); 2801 recvurg = 0; 2802 } else { 2803 if (!transflag) 2804 syslog(LOG_ERR, "Internal: flagxfer(0): " 2805 "no active transfer"); 2806 maskurg(1); 2807 transflag = 0; 2808 } 2809} 2810 2811/* 2812 * Returns 0 if OK to resume or -1 if abort requested. 2813 */ 2814static int 2815myoob(void) 2816{ 2817 char *cp; 2818 int ret; 2819 2820 if (!transflag) { 2821 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2822 return (0); 2823 } 2824 cp = tmpline; 2825 ret = getline(cp, 7, stdin); 2826 if (ret == -1) { 2827 reply(221, "You could at least say goodbye."); 2828 dologout(0); 2829 } else if (ret == -2) { 2830 /* Ignore truncated command. */ 2831 return (0); 2832 } 2833 upper(cp); 2834 if (strcmp(cp, "ABOR\r\n") == 0) { 2835 tmpline[0] = '\0'; 2836 reply(426, "Transfer aborted. Data connection closed."); 2837 reply(226, "Abort successful."); 2838 return (-1); 2839 } 2840 if (strcmp(cp, "STAT\r\n") == 0) { 2841 tmpline[0] = '\0'; 2842 if (file_size != -1) 2843 reply(213, "Status: %jd of %jd bytes transferred.", 2844 (intmax_t)byte_count, (intmax_t)file_size); 2845 else 2846 reply(213, "Status: %jd bytes transferred.", 2847 (intmax_t)byte_count); 2848 } 2849 return (0); 2850} 2851 2852/* 2853 * Note: a response of 425 is not mentioned as a possible response to 2854 * the PASV command in RFC959. However, it has been blessed as 2855 * a legitimate response by Jon Postel in a telephone conversation 2856 * with Rick Adams on 25 Jan 89. 2857 */ 2858void 2859passive(void) 2860{ 2861 socklen_t len; 2862 int on; 2863 char *p, *a; 2864 2865 if (pdata >= 0) /* close old port if one set */ 2866 close(pdata); 2867 2868 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2869 if (pdata < 0) { 2870 perror_reply(425, "Can't open passive connection"); 2871 return; 2872 } 2873 on = 1; 2874 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2875 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2876 2877 (void) seteuid(0); 2878 2879#ifdef IP_PORTRANGE 2880 if (ctrl_addr.su_family == AF_INET) { 2881 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2882 : IP_PORTRANGE_DEFAULT; 2883 2884 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2885 &on, sizeof(on)) < 0) 2886 goto pasv_error; 2887 } 2888#endif 2889#ifdef IPV6_PORTRANGE 2890 if (ctrl_addr.su_family == AF_INET6) { 2891 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2892 : IPV6_PORTRANGE_DEFAULT; 2893 2894 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2895 &on, sizeof(on)) < 0) 2896 goto pasv_error; 2897 } 2898#endif 2899 2900 pasv_addr = ctrl_addr; 2901 pasv_addr.su_port = 0; 2902 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2903 goto pasv_error; 2904 2905 (void) seteuid(pw->pw_uid); 2906 2907 len = sizeof(pasv_addr); 2908 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2909 goto pasv_error; 2910 if (listen(pdata, 1) < 0) 2911 goto pasv_error; 2912 if (pasv_addr.su_family == AF_INET) 2913 a = (char *) &pasv_addr.su_sin.sin_addr; 2914 else if (pasv_addr.su_family == AF_INET6 && 2915 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2916 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2917 else 2918 goto pasv_error; 2919 2920 p = (char *) &pasv_addr.su_port; 2921 2922#define UC(b) (((int) b) & 0xff) 2923 2924 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2925 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2926 return; 2927 2928pasv_error: 2929 (void) seteuid(pw->pw_uid); 2930 (void) close(pdata); 2931 pdata = -1; 2932 perror_reply(425, "Can't open passive connection"); 2933 return; 2934} 2935 2936/* 2937 * Long Passive defined in RFC 1639. 2938 * 228 Entering Long Passive Mode 2939 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2940 */ 2941 2942void 2943long_passive(char *cmd, int pf) 2944{ 2945 socklen_t len; 2946 int on; 2947 char *p, *a; 2948 2949 if (pdata >= 0) /* close old port if one set */ 2950 close(pdata); 2951 2952 if (pf != PF_UNSPEC) { 2953 if (ctrl_addr.su_family != pf) { 2954 switch (ctrl_addr.su_family) { 2955 case AF_INET: 2956 pf = 1; 2957 break; 2958 case AF_INET6: 2959 pf = 2; 2960 break; 2961 default: 2962 pf = 0; 2963 break; 2964 } 2965 /* 2966 * XXX 2967 * only EPRT/EPSV ready clients will understand this 2968 */ 2969 if (strcmp(cmd, "EPSV") == 0 && pf) { 2970 reply(522, "Network protocol mismatch, " 2971 "use (%d)", pf); 2972 } else 2973 reply(501, "Network protocol mismatch."); /*XXX*/ 2974 2975 return; 2976 } 2977 } 2978 2979 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2980 if (pdata < 0) { 2981 perror_reply(425, "Can't open passive connection"); 2982 return; 2983 } 2984 on = 1; 2985 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2986 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2987 2988 (void) seteuid(0); 2989 2990 pasv_addr = ctrl_addr; 2991 pasv_addr.su_port = 0; 2992 len = pasv_addr.su_len; 2993 2994#ifdef IP_PORTRANGE 2995 if (ctrl_addr.su_family == AF_INET) { 2996 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2997 : IP_PORTRANGE_DEFAULT; 2998 2999 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 3000 &on, sizeof(on)) < 0) 3001 goto pasv_error; 3002 } 3003#endif 3004#ifdef IPV6_PORTRANGE 3005 if (ctrl_addr.su_family == AF_INET6) { 3006 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 3007 : IPV6_PORTRANGE_DEFAULT; 3008 3009 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 3010 &on, sizeof(on)) < 0) 3011 goto pasv_error; 3012 } 3013#endif 3014 3015 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 3016 goto pasv_error; 3017 3018 (void) seteuid(pw->pw_uid); 3019 3020 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 3021 goto pasv_error; 3022 if (listen(pdata, 1) < 0) 3023 goto pasv_error; 3024 3025#define UC(b) (((int) b) & 0xff) 3026 3027 if (strcmp(cmd, "LPSV") == 0) { 3028 p = (char *)&pasv_addr.su_port; 3029 switch (pasv_addr.su_family) { 3030 case AF_INET: 3031 a = (char *) &pasv_addr.su_sin.sin_addr; 3032 v4_reply: 3033 reply(228, 3034"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3035 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3036 2, UC(p[0]), UC(p[1])); 3037 return; 3038 case AF_INET6: 3039 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3040 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3041 goto v4_reply; 3042 } 3043 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3044 reply(228, 3045"Entering Long Passive Mode " 3046"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3047 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3048 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3049 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3050 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3051 2, UC(p[0]), UC(p[1])); 3052 return; 3053 } 3054 } else if (strcmp(cmd, "EPSV") == 0) { 3055 switch (pasv_addr.su_family) { 3056 case AF_INET: 3057 case AF_INET6: 3058 reply(229, "Entering Extended Passive Mode (|||%d|)", 3059 ntohs(pasv_addr.su_port)); 3060 return; 3061 } 3062 } else { 3063 /* more proper error code? */ 3064 } 3065 3066pasv_error: 3067 (void) seteuid(pw->pw_uid); 3068 (void) close(pdata); 3069 pdata = -1; 3070 perror_reply(425, "Can't open passive connection"); 3071 return; 3072} 3073 3074/* 3075 * Generate unique name for file with basename "local" 3076 * and open the file in order to avoid possible races. 3077 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3078 * Return descriptor to the file, set "name" to its name. 3079 * 3080 * Generates failure reply on error. 3081 */ 3082static int 3083guniquefd(char *local, char **name) 3084{ 3085 static char new[MAXPATHLEN]; 3086 struct stat st; 3087 char *cp; 3088 int count; 3089 int fd; 3090 3091 cp = strrchr(local, '/'); 3092 if (cp) 3093 *cp = '\0'; 3094 if (stat(cp ? local : ".", &st) < 0) { 3095 perror_reply(553, cp ? local : "."); 3096 return (-1); 3097 } 3098 if (cp) { 3099 /* 3100 * Let not overwrite dirname with counter suffix. 3101 * -4 is for /nn\0 3102 * In this extreme case dot won't be put in front of suffix. 3103 */ 3104 if (strlen(local) > sizeof(new) - 4) { 3105 reply(553, "Pathname too long."); 3106 return (-1); 3107 } 3108 *cp = '/'; 3109 } 3110 /* -4 is for the .nn<null> we put on the end below */ 3111 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3112 cp = new + strlen(new); 3113 /* 3114 * Don't generate dotfile unless requested explicitly. 3115 * This covers the case when basename gets truncated off 3116 * by buffer size. 3117 */ 3118 if (cp > new && cp[-1] != '/') 3119 *cp++ = '.'; 3120 for (count = 0; count < 100; count++) { 3121 /* At count 0 try unmodified name */ 3122 if (count) 3123 (void)sprintf(cp, "%d", count); 3124 if ((fd = open(count ? new : local, 3125 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3126 *name = count ? new : local; 3127 return (fd); 3128 } 3129 if (errno != EEXIST) { 3130 perror_reply(553, count ? new : local); 3131 return (-1); 3132 } 3133 } 3134 reply(452, "Unique file name cannot be created."); 3135 return (-1); 3136} 3137 3138/* 3139 * Format and send reply containing system error number. 3140 */ 3141void 3142perror_reply(int code, char *string) 3143{ 3144 3145 reply(code, "%s: %s.", string, strerror(errno)); 3146} 3147 3148static char *onefile[] = { 3149 "", 3150 0 3151}; 3152 3153void 3154send_file_list(char *whichf) 3155{ 3156 struct stat st; 3157 DIR *dirp = NULL; 3158 struct dirent *dir; 3159 FILE *dout = NULL; 3160 char **dirlist, *dirname; 3161 int simple = 0; 3162 int freeglob = 0; 3163 glob_t gl; 3164 3165 if (strpbrk(whichf, "~{[*?") != NULL) { 3166 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3167 3168 memset(&gl, 0, sizeof(gl)); 3169 gl.gl_matchc = MAXGLOBARGS; 3170 flags |= GLOB_LIMIT; 3171 freeglob = 1; 3172 if (glob(whichf, flags, 0, &gl)) { 3173 reply(550, "No matching files found."); 3174 goto out; 3175 } else if (gl.gl_pathc == 0) { 3176 errno = ENOENT; 3177 perror_reply(550, whichf); 3178 goto out; 3179 } 3180 dirlist = gl.gl_pathv; 3181 } else { 3182 onefile[0] = whichf; 3183 dirlist = onefile; 3184 simple = 1; 3185 } 3186 3187 while ((dirname = *dirlist++)) { 3188 if (stat(dirname, &st) < 0) { 3189 /* 3190 * If user typed "ls -l", etc, and the client 3191 * used NLST, do what the user meant. 3192 */ 3193 if (dirname[0] == '-' && *dirlist == NULL && 3194 dout == NULL) 3195 retrieve(_PATH_LS " %s", dirname); 3196 else 3197 perror_reply(550, whichf); 3198 goto out; 3199 } 3200 3201 if (S_ISREG(st.st_mode)) { 3202 if (dout == NULL) { 3203 dout = dataconn("file list", -1, "w"); 3204 if (dout == NULL) 3205 goto out; 3206 STARTXFER; 3207 } 3208 START_UNSAFE; 3209 fprintf(dout, "%s%s\n", dirname, 3210 type == TYPE_A ? "\r" : ""); 3211 END_UNSAFE; 3212 if (ferror(dout)) 3213 goto data_err; 3214 byte_count += strlen(dirname) + 3215 (type == TYPE_A ? 2 : 1); 3216 CHECKOOB(goto abrt); 3217 continue; 3218 } else if (!S_ISDIR(st.st_mode)) 3219 continue; 3220 3221 if ((dirp = opendir(dirname)) == NULL) 3222 continue; 3223 3224 while ((dir = readdir(dirp)) != NULL) { 3225 char nbuf[MAXPATHLEN]; 3226 3227 CHECKOOB(goto abrt); 3228 3229 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3230 continue; 3231 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3232 dir->d_namlen == 2) 3233 continue; 3234 3235 snprintf(nbuf, sizeof(nbuf), 3236 "%s/%s", dirname, dir->d_name); 3237 3238 /* 3239 * We have to do a stat to insure it's 3240 * not a directory or special file. 3241 */ 3242 if (simple || (stat(nbuf, &st) == 0 && 3243 S_ISREG(st.st_mode))) { 3244 if (dout == NULL) { 3245 dout = dataconn("file list", -1, "w"); 3246 if (dout == NULL) 3247 goto out; 3248 STARTXFER; 3249 } 3250 START_UNSAFE; 3251 if (nbuf[0] == '.' && nbuf[1] == '/') 3252 fprintf(dout, "%s%s\n", &nbuf[2], 3253 type == TYPE_A ? "\r" : ""); 3254 else 3255 fprintf(dout, "%s%s\n", nbuf, 3256 type == TYPE_A ? "\r" : ""); 3257 END_UNSAFE; 3258 if (ferror(dout)) 3259 goto data_err; 3260 byte_count += strlen(nbuf) + 3261 (type == TYPE_A ? 2 : 1); 3262 CHECKOOB(goto abrt); 3263 } 3264 } 3265 (void) closedir(dirp); 3266 dirp = NULL; 3267 } 3268 3269 if (dout == NULL) 3270 reply(550, "No files found."); 3271 else if (ferror(dout)) 3272data_err: perror_reply(550, "Data connection"); 3273 else 3274 reply(226, "Transfer complete."); 3275out: 3276 if (dout) { 3277 ENDXFER; 3278abrt: 3279 (void) fclose(dout); 3280 data = -1; 3281 pdata = -1; 3282 } 3283 if (dirp) 3284 (void) closedir(dirp); 3285 if (freeglob) { 3286 freeglob = 0; 3287 globfree(&gl); 3288 } 3289} 3290 3291void 3292reapchild(int signo) 3293{ 3294 while (waitpid(-1, NULL, WNOHANG) > 0); 3295} 3296 3297#ifdef OLD_SETPROCTITLE 3298/* 3299 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3300 * Warning, since this is usually started from inetd.conf, it often doesn't 3301 * have much of an environment or arglist to overwrite. 3302 */ 3303void 3304setproctitle(const char *fmt, ...) 3305{ 3306 int i; 3307 va_list ap; 3308 char *p, *bp, ch; 3309 char buf[LINE_MAX]; 3310 3311 va_start(ap, fmt); 3312 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3313 3314 /* make ps print our process name */ 3315 p = Argv[0]; 3316 *p++ = '-'; 3317 3318 i = strlen(buf); 3319 if (i > LastArgv - p - 2) { 3320 i = LastArgv - p - 2; 3321 buf[i] = '\0'; 3322 } 3323 bp = buf; 3324 while (ch = *bp++) 3325 if (ch != '\n' && ch != '\r') 3326 *p++ = ch; 3327 while (p < LastArgv) 3328 *p++ = ' '; 3329} 3330#endif /* OLD_SETPROCTITLE */ 3331 3332static void 3333appendf(char **strp, char *fmt, ...) 3334{ 3335 va_list ap; 3336 char *ostr, *p; 3337 3338 va_start(ap, fmt); 3339 vasprintf(&p, fmt, ap); 3340 va_end(ap); 3341 if (p == NULL) 3342 fatalerror("Ran out of memory."); 3343 if (*strp == NULL) 3344 *strp = p; 3345 else { 3346 ostr = *strp; 3347 asprintf(strp, "%s%s", ostr, p); 3348 if (*strp == NULL) 3349 fatalerror("Ran out of memory."); 3350 free(ostr); 3351 } 3352} 3353 3354static void 3355logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3356{ 3357 char *msg = NULL; 3358 char wd[MAXPATHLEN + 1]; 3359 3360 if (logging <= 1) 3361 return; 3362 3363 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3364 strcpy(wd, strerror(errno)); 3365 3366 appendf(&msg, "%s", cmd); 3367 if (file1) 3368 appendf(&msg, " %s", file1); 3369 if (file2) 3370 appendf(&msg, " %s", file2); 3371 if (cnt >= 0) 3372 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3373 appendf(&msg, " (wd: %s", wd); 3374 if (guest || dochroot) 3375 appendf(&msg, "; chrooted"); 3376 appendf(&msg, ")"); 3377 syslog(LOG_INFO, "%s", msg); 3378 free(msg); 3379} 3380 3381static void 3382logxfer(char *name, off_t size, time_t start) 3383{ 3384 char buf[MAXPATHLEN + 1024]; 3385 char path[MAXPATHLEN + 1]; 3386 time_t now; 3387 3388 if (statfd >= 0) { 3389 time(&now); 3390 if (realpath(name, path) == NULL) { 3391 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3392 return; 3393 } 3394 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3395 ctime(&now)+4, ident, remotehost, 3396 path, (intmax_t)size, 3397 (long)(now - start + (now == start))); 3398 write(statfd, buf, strlen(buf)); 3399 } 3400} 3401 3402static char * 3403doublequote(char *s) 3404{ 3405 int n; 3406 char *p, *s2; 3407 3408 for (p = s, n = 0; *p; p++) 3409 if (*p == '"') 3410 n++; 3411 3412 if ((s2 = malloc(p - s + n + 1)) == NULL) 3413 return (NULL); 3414 3415 for (p = s2; *s; s++, p++) { 3416 if ((*p = *s) == '"') 3417 *(++p) = '"'; 3418 } 3419 *p = '\0'; 3420 3421 return (s2); 3422} 3423 3424/* setup server socket for specified address family */ 3425/* if af is PF_UNSPEC more than one socket may be returned */ 3426/* the returned list is dynamically allocated, so caller needs to free it */ 3427static int * 3428socksetup(int af, char *bindname, const char *bindport) 3429{ 3430 struct addrinfo hints, *res, *r; 3431 int error, maxs, *s, *socks; 3432 const int on = 1; 3433 3434 memset(&hints, 0, sizeof(hints)); 3435 hints.ai_flags = AI_PASSIVE; 3436 hints.ai_family = af; 3437 hints.ai_socktype = SOCK_STREAM; 3438 error = getaddrinfo(bindname, bindport, &hints, &res); 3439 if (error) { 3440 syslog(LOG_ERR, "%s", gai_strerror(error)); 3441 if (error == EAI_SYSTEM) 3442 syslog(LOG_ERR, "%s", strerror(errno)); 3443 return NULL; 3444 } 3445 3446 /* Count max number of sockets we may open */ 3447 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3448 ; 3449 socks = malloc((maxs + 1) * sizeof(int)); 3450 if (!socks) { 3451 freeaddrinfo(res); 3452 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3453 return NULL; 3454 } 3455 3456 *socks = 0; /* num of sockets counter at start of array */ 3457 s = socks + 1; 3458 for (r = res; r; r = r->ai_next) { 3459 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3460 if (*s < 0) { 3461 syslog(LOG_DEBUG, "control socket: %m"); 3462 continue; 3463 } 3464 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3465 &on, sizeof(on)) < 0) 3466 syslog(LOG_WARNING, 3467 "control setsockopt (SO_REUSEADDR): %m"); 3468 if (r->ai_family == AF_INET6) { 3469 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3470 &on, sizeof(on)) < 0) 3471 syslog(LOG_WARNING, 3472 "control setsockopt (IPV6_V6ONLY): %m"); 3473 } 3474 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3475 syslog(LOG_DEBUG, "control bind: %m"); 3476 close(*s); 3477 continue; 3478 } 3479 (*socks)++; 3480 s++; 3481 } 3482 3483 if (res) 3484 freeaddrinfo(res); 3485 3486 if (*socks == 0) { 3487 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3488 free(socks); 3489 return NULL; 3490 } 3491 return(socks); 3492} 3493