ftpd.c revision 327019
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: stable/10/libexec/ftpd/ftpd.c 327019 2017-12-20 07:18:07Z delphij $"); 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#include "pathnames.h" 97#include "extern.h" 98 99#include <stdarg.h> 100 101static char version[] = "Version 6.00LS"; 102#undef main 103 104union sockunion ctrl_addr; 105union sockunion data_source; 106union sockunion data_dest; 107union sockunion his_addr; 108union sockunion pasv_addr; 109 110int daemon_mode; 111int data; 112int dataport; 113int hostinfo = 1; /* print host-specific info in messages */ 114int logged_in; 115struct passwd *pw; 116char *homedir; 117int ftpdebug; 118int timeout = 900; /* timeout after 15 minutes of inactivity */ 119int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 120int logging; 121int restricted_data_ports = 1; 122int paranoid = 1; /* be extra careful about security */ 123int anon_only = 0; /* Only anonymous ftp allowed */ 124int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 125int guest; 126int dochroot; 127char *chrootdir; 128int dowtmp = 1; 129int stats; 130int statfd = -1; 131int type; 132int form; 133int stru; /* avoid C keyword */ 134int mode; 135int usedefault = 1; /* for data transfers */ 136int pdata = -1; /* for passive mode */ 137int readonly = 0; /* Server is in readonly mode. */ 138int noepsv = 0; /* EPSV command is disabled. */ 139int noretr = 0; /* RETR command is disabled. */ 140int noguestretr = 0; /* RETR command is disabled for anon users. */ 141int noguestmkd = 0; /* MKD command is disabled for anon users. */ 142int noguestmod = 1; /* anon users may not modify existing files. */ 143 144off_t file_size; 145off_t byte_count; 146#if !defined(CMASK) || CMASK == 0 147#undef CMASK 148#define CMASK 027 149#endif 150int defumask = CMASK; /* default umask value */ 151char tmpline[7]; 152char *hostname; 153int epsvall = 0; 154 155#ifdef VIRTUAL_HOSTING 156char *ftpuser; 157 158static struct ftphost { 159 struct ftphost *next; 160 struct addrinfo *hostinfo; 161 char *hostname; 162 char *anonuser; 163 char *statfile; 164 char *welcome; 165 char *loginmsg; 166} *thishost, *firsthost; 167 168#endif 169char remotehost[NI_MAXHOST]; 170char *ident = NULL; 171 172static char wtmpid[20]; 173 174#ifdef USE_PAM 175static int auth_pam(struct passwd**, const char*); 176pam_handle_t *pamh = NULL; 177#endif 178 179static struct opie opiedata; 180static char opieprompt[OPIE_CHALLENGE_MAX+1]; 181static int pwok; 182 183char *pid_file = NULL; /* means default location to pidfile(3) */ 184 185/* 186 * Limit number of pathnames that glob can return. 187 * A limit of 0 indicates the number of pathnames is unlimited. 188 */ 189#define MAXGLOBARGS 16384 190# 191 192/* 193 * Timeout intervals for retrying connections 194 * to hosts that don't accept PORT cmds. This 195 * is a kludge, but given the problems with TCP... 196 */ 197#define SWAITMAX 90 /* wait at most 90 seconds */ 198#define SWAITINT 5 /* interval between retries */ 199 200int swaitmax = SWAITMAX; 201int swaitint = SWAITINT; 202 203#ifdef SETPROCTITLE 204#ifdef OLD_SETPROCTITLE 205char **Argv = NULL; /* pointer to argument vector */ 206char *LastArgv = NULL; /* end of argv */ 207#endif /* OLD_SETPROCTITLE */ 208char proctitle[LINE_MAX]; /* initial part of title */ 209#endif /* SETPROCTITLE */ 210 211#define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 212#define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 213#define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 214 215static volatile sig_atomic_t recvurg; 216static int transflag; /* NB: for debugging only */ 217 218#define STARTXFER flagxfer(1) 219#define ENDXFER flagxfer(0) 220 221#define START_UNSAFE maskurg(1) 222#define END_UNSAFE maskurg(0) 223 224/* It's OK to put an `else' clause after this macro. */ 225#define CHECKOOB(action) \ 226 if (recvurg) { \ 227 recvurg = 0; \ 228 if (myoob()) { \ 229 ENDXFER; \ 230 action; \ 231 } \ 232 } 233 234#ifdef VIRTUAL_HOSTING 235static void inithosts(int); 236static void selecthost(union sockunion *); 237#endif 238static void ack(char *); 239static void sigurg(int); 240static void maskurg(int); 241static void flagxfer(int); 242static int myoob(void); 243static int checkuser(char *, char *, int, char **, int *); 244static FILE *dataconn(char *, off_t, char *); 245static void dolog(struct sockaddr *); 246static void end_login(void); 247static FILE *getdatasock(char *); 248static int guniquefd(char *, char **); 249static void lostconn(int); 250static void sigquit(int); 251static int receive_data(FILE *, FILE *); 252static int send_data(FILE *, FILE *, size_t, off_t, int); 253static struct passwd * 254 sgetpwnam(char *); 255static char *sgetsave(char *); 256static void reapchild(int); 257static void appendf(char **, char *, ...) __printflike(2, 3); 258static void logcmd(char *, char *, char *, off_t); 259static void logxfer(char *, off_t, time_t); 260static char *doublequote(char *); 261static int *socksetup(int, char *, const char *); 262 263int 264main(int argc, char *argv[], char **envp) 265{ 266 socklen_t addrlen; 267 int ch, on = 1, tos; 268 char *cp, line[LINE_MAX]; 269 FILE *fd; 270 char *bindname = NULL; 271 const char *bindport = "ftp"; 272 int family = AF_UNSPEC; 273 struct sigaction sa; 274 275 tzset(); /* in case no timezone database in ~ftp */ 276 sigemptyset(&sa.sa_mask); 277 sa.sa_flags = SA_RESTART; 278 279#ifdef OLD_SETPROCTITLE 280 /* 281 * Save start and extent of argv for setproctitle. 282 */ 283 Argv = argv; 284 while (*envp) 285 envp++; 286 LastArgv = envp[-1] + strlen(envp[-1]); 287#endif /* OLD_SETPROCTITLE */ 288 289 /* 290 * Prevent diagnostic messages from appearing on stderr. 291 * We run as a daemon or from inetd; in both cases, there's 292 * more reason in logging to syslog. 293 */ 294 (void) freopen(_PATH_DEVNULL, "w", stderr); 295 opterr = 0; 296 297 /* 298 * LOG_NDELAY sets up the logging connection immediately, 299 * necessary for anonymous ftp's that chroot and can't do it later. 300 */ 301 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 302 303 while ((ch = getopt(argc, argv, 304 "468a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 305 switch (ch) { 306 case '4': 307 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 308 break; 309 310 case '6': 311 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 312 break; 313 314 case '8': 315 assumeutf8 = 1; 316 break; 317 318 case 'a': 319 bindname = optarg; 320 break; 321 322 case 'A': 323 anon_only = 1; 324 break; 325 326 case 'd': 327 ftpdebug++; 328 break; 329 330 case 'D': 331 daemon_mode++; 332 break; 333 334 case 'E': 335 noepsv = 1; 336 break; 337 338 case 'h': 339 hostinfo = 0; 340 break; 341 342 case 'l': 343 logging++; /* > 1 == extra logging */ 344 break; 345 346 case 'm': 347 noguestmod = 0; 348 break; 349 350 case 'M': 351 noguestmkd = 1; 352 break; 353 354 case 'o': 355 noretr = 1; 356 break; 357 358 case 'O': 359 noguestretr = 1; 360 break; 361 362 case 'p': 363 pid_file = optarg; 364 break; 365 366 case 'P': 367 bindport = optarg; 368 break; 369 370 case 'r': 371 readonly = 1; 372 break; 373 374 case 'R': 375 paranoid = 0; 376 break; 377 378 case 'S': 379 stats++; 380 break; 381 382 case 't': 383 timeout = atoi(optarg); 384 if (maxtimeout < timeout) 385 maxtimeout = timeout; 386 break; 387 388 case 'T': 389 maxtimeout = atoi(optarg); 390 if (timeout > maxtimeout) 391 timeout = maxtimeout; 392 break; 393 394 case 'u': 395 { 396 long val = 0; 397 398 val = strtol(optarg, &optarg, 8); 399 if (*optarg != '\0' || val < 0) 400 syslog(LOG_WARNING, "bad value for -u"); 401 else 402 defumask = val; 403 break; 404 } 405 case 'U': 406 restricted_data_ports = 0; 407 break; 408 409 case 'v': 410 ftpdebug++; 411 break; 412 413 case 'W': 414 dowtmp = 0; 415 break; 416 417 default: 418 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 419 break; 420 } 421 } 422 423 /* handle filesize limit gracefully */ 424 sa.sa_handler = SIG_IGN; 425 (void)sigaction(SIGXFSZ, &sa, NULL); 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_class); 969 free(save.pw_gecos); 970 free(save.pw_dir); 971 free(save.pw_shell); 972 } 973 save = *p; 974 save.pw_name = sgetsave(p->pw_name); 975 save.pw_passwd = sgetsave(p->pw_passwd); 976 save.pw_class = sgetsave(p->pw_class); 977 save.pw_gecos = sgetsave(p->pw_gecos); 978 save.pw_dir = sgetsave(p->pw_dir); 979 save.pw_shell = sgetsave(p->pw_shell); 980 return (&save); 981} 982 983static int login_attempts; /* number of failed login attempts */ 984static int askpasswd; /* had user command, ask for passwd */ 985static char curname[MAXLOGNAME]; /* current USER name */ 986 987/* 988 * USER command. 989 * Sets global passwd pointer pw if named account exists and is acceptable; 990 * sets askpasswd if a PASS command is expected. If logged in previously, 991 * need to reset state. If name is "ftp" or "anonymous", the name is not in 992 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 993 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 994 * requesting login privileges. Disallow anyone who does not have a standard 995 * shell as returned by getusershell(). Disallow anyone mentioned in the file 996 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 997 */ 998void 999user(char *name) 1000{ 1001 int ecode; 1002 char *cp, *shell; 1003 1004 if (logged_in) { 1005 if (guest) { 1006 reply(530, "Can't change user from guest login."); 1007 return; 1008 } else if (dochroot) { 1009 reply(530, "Can't change user from chroot user."); 1010 return; 1011 } 1012 end_login(); 1013 } 1014 1015 guest = 0; 1016#ifdef VIRTUAL_HOSTING 1017 pw = sgetpwnam(thishost->anonuser); 1018#else 1019 pw = sgetpwnam("ftp"); 1020#endif 1021 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1022 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL, &ecode) || 1023 (ecode != 0 && ecode != ENOENT)) 1024 reply(530, "User %s access denied.", name); 1025 else if (checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL, &ecode) || 1026 (ecode != 0 && ecode != ENOENT)) 1027 reply(530, "User %s access denied.", name); 1028 else if (pw != NULL) { 1029 guest = 1; 1030 askpasswd = 1; 1031 reply(331, 1032 "Guest login ok, send your email address as password."); 1033 } else 1034 reply(530, "User %s unknown.", name); 1035 if (!askpasswd && logging) 1036 syslog(LOG_NOTICE, 1037 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1038 return; 1039 } 1040 if (anon_only != 0) { 1041 reply(530, "Sorry, only anonymous ftp allowed."); 1042 return; 1043 } 1044 1045 if ((pw = sgetpwnam(name))) { 1046 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1047 shell = _PATH_BSHELL; 1048 setusershell(); 1049 while ((cp = getusershell()) != NULL) 1050 if (strcmp(cp, shell) == 0) 1051 break; 1052 endusershell(); 1053 1054 if (cp == NULL || 1055 (checkuser(_PATH_FTPUSERS, name, 1, NULL, &ecode) || 1056 (ecode != 0 && ecode != ENOENT))) { 1057 reply(530, "User %s access denied.", name); 1058 if (logging) 1059 syslog(LOG_NOTICE, 1060 "FTP LOGIN REFUSED FROM %s, %s", 1061 remotehost, name); 1062 pw = NULL; 1063 return; 1064 } 1065 } 1066 if (logging) 1067 strlcpy(curname, name, sizeof(curname)); 1068 1069 pwok = 0; 1070#ifdef USE_PAM 1071 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1072#endif 1073 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1074 pwok = (pw != NULL) && 1075 opieaccessfile(remotehost) && 1076 opiealways(pw->pw_dir); 1077 reply(331, "Response to %s %s for %s.", 1078 opieprompt, pwok ? "requested" : "required", name); 1079 } else { 1080 pwok = 1; 1081 reply(331, "Password required for %s.", name); 1082 } 1083 askpasswd = 1; 1084 /* 1085 * Delay before reading passwd after first failed 1086 * attempt to slow down passwd-guessing programs. 1087 */ 1088 if (login_attempts) 1089 sleep(login_attempts); 1090} 1091 1092/* 1093 * Check if a user is in the file "fname", 1094 * return a pointer to a malloc'd string with the rest 1095 * of the matching line in "residue" if not NULL. 1096 */ 1097static int 1098checkuser(char *fname, char *name, int pwset, char **residue, int *ecode) 1099{ 1100 FILE *fd; 1101 int found = 0; 1102 size_t len; 1103 char *line, *mp, *p; 1104 1105 if (ecode != NULL) 1106 *ecode = 0; 1107 if ((fd = fopen(fname, "r")) != NULL) { 1108 while (!found && (line = fgetln(fd, &len)) != NULL) { 1109 /* skip comments */ 1110 if (line[0] == '#') 1111 continue; 1112 if (line[len - 1] == '\n') { 1113 line[len - 1] = '\0'; 1114 mp = NULL; 1115 } else { 1116 if ((mp = malloc(len + 1)) == NULL) 1117 fatalerror("Ran out of memory."); 1118 memcpy(mp, line, len); 1119 mp[len] = '\0'; 1120 line = mp; 1121 } 1122 /* avoid possible leading and trailing whitespace */ 1123 p = strtok(line, " \t"); 1124 /* skip empty lines */ 1125 if (p == NULL) 1126 goto nextline; 1127 /* 1128 * if first chr is '@', check group membership 1129 */ 1130 if (p[0] == '@') { 1131 int i = 0; 1132 struct group *grp; 1133 1134 if (p[1] == '\0') /* single @ matches anyone */ 1135 found = 1; 1136 else { 1137 if ((grp = getgrnam(p+1)) == NULL) 1138 goto nextline; 1139 /* 1140 * Check user's default group 1141 */ 1142 if (pwset && grp->gr_gid == pw->pw_gid) 1143 found = 1; 1144 /* 1145 * Check supplementary groups 1146 */ 1147 while (!found && grp->gr_mem[i]) 1148 found = strcmp(name, 1149 grp->gr_mem[i++]) 1150 == 0; 1151 } 1152 } 1153 /* 1154 * Otherwise, just check for username match 1155 */ 1156 else 1157 found = strcmp(p, name) == 0; 1158 /* 1159 * Save the rest of line to "residue" if matched 1160 */ 1161 if (found && residue) { 1162 if ((p = strtok(NULL, "")) != NULL) 1163 p += strspn(p, " \t"); 1164 if (p && *p) { 1165 if ((*residue = strdup(p)) == NULL) 1166 fatalerror("Ran out of memory."); 1167 } else 1168 *residue = NULL; 1169 } 1170nextline: 1171 if (mp) 1172 free(mp); 1173 } 1174 (void) fclose(fd); 1175 } else if (ecode != NULL) 1176 *ecode = errno; 1177 return (found); 1178} 1179 1180/* 1181 * Terminate login as previous user, if any, resetting state; 1182 * used when USER command is given or login fails. 1183 */ 1184static void 1185end_login(void) 1186{ 1187#ifdef USE_PAM 1188 int e; 1189#endif 1190 1191 (void) seteuid(0); 1192#ifdef LOGIN_CAP 1193 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 1194 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 1195 LOGIN_SETENV)); 1196#endif 1197 if (logged_in && dowtmp) 1198 ftpd_logwtmp(wtmpid, NULL, NULL); 1199 pw = NULL; 1200#ifdef USE_PAM 1201 if (pamh) { 1202 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1203 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1204 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1205 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1206 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1207 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1208 pamh = NULL; 1209 } 1210#endif 1211 logged_in = 0; 1212 guest = 0; 1213 dochroot = 0; 1214} 1215 1216#ifdef USE_PAM 1217 1218/* 1219 * the following code is stolen from imap-uw PAM authentication module and 1220 * login.c 1221 */ 1222#define COPY_STRING(s) (s ? strdup(s) : NULL) 1223 1224struct cred_t { 1225 const char *uname; /* user name */ 1226 const char *pass; /* password */ 1227}; 1228typedef struct cred_t cred_t; 1229 1230static int 1231auth_conv(int num_msg, const struct pam_message **msg, 1232 struct pam_response **resp, void *appdata) 1233{ 1234 int i; 1235 cred_t *cred = (cred_t *) appdata; 1236 struct pam_response *reply; 1237 1238 reply = calloc(num_msg, sizeof *reply); 1239 if (reply == NULL) 1240 return PAM_BUF_ERR; 1241 1242 for (i = 0; i < num_msg; i++) { 1243 switch (msg[i]->msg_style) { 1244 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1245 reply[i].resp_retcode = PAM_SUCCESS; 1246 reply[i].resp = COPY_STRING(cred->uname); 1247 /* PAM frees resp. */ 1248 break; 1249 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1250 reply[i].resp_retcode = PAM_SUCCESS; 1251 reply[i].resp = COPY_STRING(cred->pass); 1252 /* PAM frees resp. */ 1253 break; 1254 case PAM_TEXT_INFO: 1255 case PAM_ERROR_MSG: 1256 reply[i].resp_retcode = PAM_SUCCESS; 1257 reply[i].resp = NULL; 1258 break; 1259 default: /* unknown message style */ 1260 free(reply); 1261 return PAM_CONV_ERR; 1262 } 1263 } 1264 1265 *resp = reply; 1266 return PAM_SUCCESS; 1267} 1268 1269/* 1270 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1271 * authenticated, or 1 if not authenticated. If some sort of PAM system 1272 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1273 * function returns -1. This can be used as an indication that we should 1274 * fall back to a different authentication mechanism. 1275 */ 1276static int 1277auth_pam(struct passwd **ppw, const char *pass) 1278{ 1279 const char *tmpl_user; 1280 const void *item; 1281 int rval; 1282 int e; 1283 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1284 struct pam_conv conv = { &auth_conv, &auth_cred }; 1285 1286 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1287 if (e != PAM_SUCCESS) { 1288 /* 1289 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1290 * if context creation has failed in the first place. 1291 */ 1292 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1293 return -1; 1294 } 1295 1296 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1297 if (e != PAM_SUCCESS) { 1298 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1299 pam_strerror(pamh, e)); 1300 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1301 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1302 } 1303 pamh = NULL; 1304 return -1; 1305 } 1306 1307 e = pam_authenticate(pamh, 0); 1308 switch (e) { 1309 case PAM_SUCCESS: 1310 /* 1311 * With PAM we support the concept of a "template" 1312 * user. The user enters a login name which is 1313 * authenticated by PAM, usually via a remote service 1314 * such as RADIUS or TACACS+. If authentication 1315 * succeeds, a different but related "template" name 1316 * is used for setting the credentials, shell, and 1317 * home directory. The name the user enters need only 1318 * exist on the remote authentication server, but the 1319 * template name must be present in the local password 1320 * database. 1321 * 1322 * This is supported by two various mechanisms in the 1323 * individual modules. However, from the application's 1324 * point of view, the template user is always passed 1325 * back as a changed value of the PAM_USER item. 1326 */ 1327 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1328 PAM_SUCCESS) { 1329 tmpl_user = (const char *) item; 1330 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1331 *ppw = getpwnam(tmpl_user); 1332 } else 1333 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1334 pam_strerror(pamh, e)); 1335 rval = 0; 1336 break; 1337 1338 case PAM_AUTH_ERR: 1339 case PAM_USER_UNKNOWN: 1340 case PAM_MAXTRIES: 1341 rval = 1; 1342 break; 1343 1344 default: 1345 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1346 rval = -1; 1347 break; 1348 } 1349 1350 if (rval == 0) { 1351 e = pam_acct_mgmt(pamh, 0); 1352 if (e != PAM_SUCCESS) { 1353 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1354 pam_strerror(pamh, e)); 1355 rval = 1; 1356 } 1357 } 1358 1359 if (rval != 0) { 1360 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1361 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1362 } 1363 pamh = NULL; 1364 } 1365 return rval; 1366} 1367 1368#endif /* USE_PAM */ 1369 1370void 1371pass(char *passwd) 1372{ 1373 int rval, ecode; 1374 FILE *fd; 1375#ifdef LOGIN_CAP 1376 login_cap_t *lc = NULL; 1377#endif 1378#ifdef USE_PAM 1379 int e; 1380#endif 1381 char *residue = NULL; 1382 char *xpasswd; 1383 1384 if (logged_in || askpasswd == 0) { 1385 reply(503, "Login with USER first."); 1386 return; 1387 } 1388 askpasswd = 0; 1389 if (!guest) { /* "ftp" is only account allowed no password */ 1390 if (pw == NULL) { 1391 rval = 1; /* failure below */ 1392 goto skip; 1393 } 1394#ifdef USE_PAM 1395 rval = auth_pam(&pw, passwd); 1396 if (rval >= 0) { 1397 opieunlock(); 1398 goto skip; 1399 } 1400#endif 1401 if (opieverify(&opiedata, passwd) == 0) 1402 xpasswd = pw->pw_passwd; 1403 else if (pwok) { 1404 xpasswd = crypt(passwd, pw->pw_passwd); 1405 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1406 xpasswd = ":"; 1407 } else { 1408 rval = 1; 1409 goto skip; 1410 } 1411 rval = strcmp(pw->pw_passwd, xpasswd); 1412 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1413 rval = 1; /* failure */ 1414skip: 1415 /* 1416 * If rval == 1, the user failed the authentication check 1417 * above. If rval == 0, either PAM or local authentication 1418 * succeeded. 1419 */ 1420 if (rval) { 1421 reply(530, "Login incorrect."); 1422 if (logging) { 1423 syslog(LOG_NOTICE, 1424 "FTP LOGIN FAILED FROM %s", 1425 remotehost); 1426 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1427 "FTP LOGIN FAILED FROM %s, %s", 1428 remotehost, curname); 1429 } 1430 pw = NULL; 1431 if (login_attempts++ >= 5) { 1432 syslog(LOG_NOTICE, 1433 "repeated login failures from %s", 1434 remotehost); 1435 exit(0); 1436 } 1437 return; 1438 } 1439 } 1440 login_attempts = 0; /* this time successful */ 1441 if (setegid(pw->pw_gid) < 0) { 1442 reply(550, "Can't set gid."); 1443 return; 1444 } 1445 /* May be overridden by login.conf */ 1446 (void) umask(defumask); 1447#ifdef LOGIN_CAP 1448 if ((lc = login_getpwclass(pw)) != NULL) { 1449 char remote_ip[NI_MAXHOST]; 1450 1451 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1452 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1453 NI_NUMERICHOST)) 1454 *remote_ip = 0; 1455 remote_ip[sizeof(remote_ip) - 1] = 0; 1456 if (!auth_hostok(lc, remotehost, remote_ip)) { 1457 syslog(LOG_INFO|LOG_AUTH, 1458 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1459 pw->pw_name); 1460 reply(530, "Permission denied."); 1461 pw = NULL; 1462 return; 1463 } 1464 if (!auth_timeok(lc, time(NULL))) { 1465 reply(530, "Login not available right now."); 1466 pw = NULL; 1467 return; 1468 } 1469 } 1470 setusercontext(lc, pw, 0, LOGIN_SETALL & 1471 ~(LOGIN_SETRESOURCES | LOGIN_SETUSER | LOGIN_SETPATH | LOGIN_SETENV)); 1472#else 1473 setlogin(pw->pw_name); 1474 (void) initgroups(pw->pw_name, pw->pw_gid); 1475#endif 1476 1477#ifdef USE_PAM 1478 if (pamh) { 1479 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1480 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1481 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1482 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1483 } 1484 } 1485#endif 1486 1487 dochroot = 1488 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue, &ecode) 1489#ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1490 || login_getcapbool(lc, "ftp-chroot", 0) 1491#endif 1492 ; 1493 /* 1494 * It is possible that checkuser() failed to open the chroot file. 1495 * If this is the case, report that logins are un-available, since we 1496 * have no way of checking whether or not the user should be chrooted. 1497 * We ignore ENOENT since it is not required that this file be present. 1498 */ 1499 if (ecode != 0 && ecode != ENOENT) { 1500 reply(530, "Login not available right now."); 1501 return; 1502 } 1503 chrootdir = NULL; 1504 1505 /* Disable wtmp logging when chrooting. */ 1506 if (dochroot || guest) 1507 dowtmp = 0; 1508 if (dowtmp) 1509 ftpd_logwtmp(wtmpid, pw->pw_name, 1510 (struct sockaddr *)&his_addr); 1511 logged_in = 1; 1512 1513#ifdef LOGIN_CAP 1514 setusercontext(lc, pw, 0, LOGIN_SETRESOURCES); 1515#endif 1516 1517 if (guest && stats && statfd < 0) 1518#ifdef VIRTUAL_HOSTING 1519 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1520#else 1521 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1522#endif 1523 if (statfd < 0) 1524 stats = 0; 1525 1526 /* 1527 * For a chrooted local user, 1528 * a) see whether ftpchroot(5) specifies a chroot directory, 1529 * b) extract the directory pathname from the line, 1530 * c) expand it to the absolute pathname if necessary. 1531 */ 1532 if (dochroot && residue && 1533 (chrootdir = strtok(residue, " \t")) != NULL) { 1534 if (chrootdir[0] != '/') 1535 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1536 else 1537 chrootdir = strdup(chrootdir); /* make it permanent */ 1538 if (chrootdir == NULL) 1539 fatalerror("Ran out of memory."); 1540 } 1541 if (guest || dochroot) { 1542 /* 1543 * If no chroot directory set yet, use the login directory. 1544 * Copy it so it can be modified while pw->pw_dir stays intact. 1545 */ 1546 if (chrootdir == NULL && 1547 (chrootdir = strdup(pw->pw_dir)) == NULL) 1548 fatalerror("Ran out of memory."); 1549 /* 1550 * Check for the "/chroot/./home" syntax, 1551 * separate the chroot and home directory pathnames. 1552 */ 1553 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1554 *(homedir++) = '\0'; /* wipe '/' */ 1555 homedir++; /* skip '.' */ 1556 } else { 1557 /* 1558 * We MUST do a chdir() after the chroot. Otherwise 1559 * the old current directory will be accessible as "." 1560 * outside the new root! 1561 */ 1562 homedir = "/"; 1563 } 1564 /* 1565 * Finally, do chroot() 1566 */ 1567 if (chroot(chrootdir) < 0) { 1568 reply(550, "Can't change root."); 1569 goto bad; 1570 } 1571 __FreeBSD_libc_enter_restricted_mode(); 1572 } else /* real user w/o chroot */ 1573 homedir = pw->pw_dir; 1574 /* 1575 * Set euid *before* doing chdir() so 1576 * a) the user won't be carried to a directory that he couldn't reach 1577 * on his own due to no permission to upper path components, 1578 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1579 * (uid 0 has no root power over NFS if not mapped explicitly.) 1580 */ 1581 if (seteuid(pw->pw_uid) < 0) { 1582 reply(550, "Can't set uid."); 1583 goto bad; 1584 } 1585 if (chdir(homedir) < 0) { 1586 if (guest || dochroot) { 1587 reply(550, "Can't change to base directory."); 1588 goto bad; 1589 } else { 1590 if (chdir("/") < 0) { 1591 reply(550, "Root is inaccessible."); 1592 goto bad; 1593 } 1594 lreply(230, "No directory! Logging in with home=/."); 1595 } 1596 } 1597 1598 /* 1599 * Display a login message, if it exists. 1600 * N.B. reply(230,) must follow the message. 1601 */ 1602#ifdef VIRTUAL_HOSTING 1603 fd = fopen(thishost->loginmsg, "r"); 1604#else 1605 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1606#endif 1607 if (fd != NULL) { 1608 char *cp, line[LINE_MAX]; 1609 1610 while (fgets(line, sizeof(line), fd) != NULL) { 1611 if ((cp = strchr(line, '\n')) != NULL) 1612 *cp = '\0'; 1613 lreply(230, "%s", line); 1614 } 1615 (void) fflush(stdout); 1616 (void) fclose(fd); 1617 } 1618 if (guest) { 1619 if (ident != NULL) 1620 free(ident); 1621 ident = strdup(passwd); 1622 if (ident == NULL) 1623 fatalerror("Ran out of memory."); 1624 1625 reply(230, "Guest login ok, access restrictions apply."); 1626#ifdef SETPROCTITLE 1627#ifdef VIRTUAL_HOSTING 1628 if (thishost != firsthost) 1629 snprintf(proctitle, sizeof(proctitle), 1630 "%s: anonymous(%s)/%s", remotehost, hostname, 1631 passwd); 1632 else 1633#endif 1634 snprintf(proctitle, sizeof(proctitle), 1635 "%s: anonymous/%s", remotehost, passwd); 1636 setproctitle("%s", proctitle); 1637#endif /* SETPROCTITLE */ 1638 if (logging) 1639 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1640 remotehost, passwd); 1641 } else { 1642 if (dochroot) 1643 reply(230, "User %s logged in, " 1644 "access restrictions apply.", pw->pw_name); 1645 else 1646 reply(230, "User %s logged in.", pw->pw_name); 1647 1648#ifdef SETPROCTITLE 1649 snprintf(proctitle, sizeof(proctitle), 1650 "%s: user/%s", remotehost, pw->pw_name); 1651 setproctitle("%s", proctitle); 1652#endif /* SETPROCTITLE */ 1653 if (logging) 1654 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1655 remotehost, pw->pw_name); 1656 } 1657 if (logging && (guest || dochroot)) 1658 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1659#ifdef LOGIN_CAP 1660 login_close(lc); 1661#endif 1662 if (residue) 1663 free(residue); 1664 return; 1665bad: 1666 /* Forget all about it... */ 1667#ifdef LOGIN_CAP 1668 login_close(lc); 1669#endif 1670 if (residue) 1671 free(residue); 1672 end_login(); 1673} 1674 1675void 1676retrieve(char *cmd, char *name) 1677{ 1678 FILE *fin, *dout; 1679 struct stat st; 1680 int (*closefunc)(FILE *); 1681 time_t start; 1682 char line[BUFSIZ]; 1683 1684 if (cmd == 0) { 1685 fin = fopen(name, "r"), closefunc = fclose; 1686 st.st_size = 0; 1687 } else { 1688 (void) snprintf(line, sizeof(line), cmd, name); 1689 name = line; 1690 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1691 st.st_size = -1; 1692 st.st_blksize = BUFSIZ; 1693 } 1694 if (fin == NULL) { 1695 if (errno != 0) { 1696 perror_reply(550, name); 1697 if (cmd == 0) { 1698 LOGCMD("get", name); 1699 } 1700 } 1701 return; 1702 } 1703 byte_count = -1; 1704 if (cmd == 0) { 1705 if (fstat(fileno(fin), &st) < 0) { 1706 perror_reply(550, name); 1707 goto done; 1708 } 1709 if (!S_ISREG(st.st_mode)) { 1710 /* 1711 * Never sending a raw directory is a workaround 1712 * for buggy clients that will attempt to RETR 1713 * a directory before listing it, e.g., Mozilla. 1714 * Preventing a guest from getting irregular files 1715 * is a simple security measure. 1716 */ 1717 if (S_ISDIR(st.st_mode) || guest) { 1718 reply(550, "%s: not a plain file.", name); 1719 goto done; 1720 } 1721 st.st_size = -1; 1722 /* st.st_blksize is set for all descriptor types */ 1723 } 1724 } 1725 if (restart_point) { 1726 if (type == TYPE_A) { 1727 off_t i, n; 1728 int c; 1729 1730 n = restart_point; 1731 i = 0; 1732 while (i++ < n) { 1733 if ((c=getc(fin)) == EOF) { 1734 perror_reply(550, name); 1735 goto done; 1736 } 1737 if (c == '\n') 1738 i++; 1739 } 1740 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1741 perror_reply(550, name); 1742 goto done; 1743 } 1744 } 1745 dout = dataconn(name, st.st_size, "w"); 1746 if (dout == NULL) 1747 goto done; 1748 time(&start); 1749 send_data(fin, dout, st.st_blksize, st.st_size, 1750 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1751 if (cmd == 0 && guest && stats && byte_count > 0) 1752 logxfer(name, byte_count, start); 1753 (void) fclose(dout); 1754 data = -1; 1755 pdata = -1; 1756done: 1757 if (cmd == 0) 1758 LOGBYTES("get", name, byte_count); 1759 (*closefunc)(fin); 1760} 1761 1762void 1763store(char *name, char *mode, int unique) 1764{ 1765 int fd; 1766 FILE *fout, *din; 1767 int (*closefunc)(FILE *); 1768 1769 if (*mode == 'a') { /* APPE */ 1770 if (unique) { 1771 /* Programming error */ 1772 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1773 unique = 0; 1774 } 1775 if (guest && noguestmod) { 1776 reply(550, "Appending to existing file denied."); 1777 goto err; 1778 } 1779 restart_point = 0; /* not affected by preceding REST */ 1780 } 1781 if (unique) /* STOU overrides REST */ 1782 restart_point = 0; 1783 if (guest && noguestmod) { 1784 if (restart_point) { /* guest STOR w/REST */ 1785 reply(550, "Modifying existing file denied."); 1786 goto err; 1787 } else /* treat guest STOR as STOU */ 1788 unique = 1; 1789 } 1790 1791 if (restart_point) 1792 mode = "r+"; /* so ASCII manual seek can work */ 1793 if (unique) { 1794 if ((fd = guniquefd(name, &name)) < 0) 1795 goto err; 1796 fout = fdopen(fd, mode); 1797 } else 1798 fout = fopen(name, mode); 1799 closefunc = fclose; 1800 if (fout == NULL) { 1801 perror_reply(553, name); 1802 goto err; 1803 } 1804 byte_count = -1; 1805 if (restart_point) { 1806 if (type == TYPE_A) { 1807 off_t i, n; 1808 int c; 1809 1810 n = restart_point; 1811 i = 0; 1812 while (i++ < n) { 1813 if ((c=getc(fout)) == EOF) { 1814 perror_reply(550, name); 1815 goto done; 1816 } 1817 if (c == '\n') 1818 i++; 1819 } 1820 /* 1821 * We must do this seek to "current" position 1822 * because we are changing from reading to 1823 * writing. 1824 */ 1825 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1826 perror_reply(550, name); 1827 goto done; 1828 } 1829 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1830 perror_reply(550, name); 1831 goto done; 1832 } 1833 } 1834 din = dataconn(name, -1, "r"); 1835 if (din == NULL) 1836 goto done; 1837 if (receive_data(din, fout) == 0) { 1838 if (unique) 1839 reply(226, "Transfer complete (unique file name:%s).", 1840 name); 1841 else 1842 reply(226, "Transfer complete."); 1843 } 1844 (void) fclose(din); 1845 data = -1; 1846 pdata = -1; 1847done: 1848 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1849 (*closefunc)(fout); 1850 return; 1851err: 1852 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1853 return; 1854} 1855 1856static FILE * 1857getdatasock(char *mode) 1858{ 1859 int on = 1, s, t, tries; 1860 1861 if (data >= 0) 1862 return (fdopen(data, mode)); 1863 1864 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1865 if (s < 0) 1866 goto bad; 1867 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1868 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1869 /* anchor socket to avoid multi-homing problems */ 1870 data_source = ctrl_addr; 1871 data_source.su_port = htons(dataport); 1872 (void) seteuid(0); 1873 for (tries = 1; ; tries++) { 1874 /* 1875 * We should loop here since it's possible that 1876 * another ftpd instance has passed this point and is 1877 * trying to open a data connection in active mode now. 1878 * Until the other connection is opened, we'll be getting 1879 * EADDRINUSE because no SOCK_STREAM sockets in the system 1880 * can share both local and remote addresses, localIP:20 1881 * and *:* in this case. 1882 */ 1883 if (bind(s, (struct sockaddr *)&data_source, 1884 data_source.su_len) >= 0) 1885 break; 1886 if (errno != EADDRINUSE || tries > 10) 1887 goto bad; 1888 sleep(tries); 1889 } 1890 (void) seteuid(pw->pw_uid); 1891#ifdef IP_TOS 1892 if (data_source.su_family == AF_INET) 1893 { 1894 on = IPTOS_THROUGHPUT; 1895 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1896 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1897 } 1898#endif 1899#ifdef TCP_NOPUSH 1900 /* 1901 * Turn off push flag to keep sender TCP from sending short packets 1902 * at the boundaries of each write(). 1903 */ 1904 on = 1; 1905 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1906 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1907#endif 1908 return (fdopen(s, mode)); 1909bad: 1910 /* Return the real value of errno (close may change it) */ 1911 t = errno; 1912 (void) seteuid(pw->pw_uid); 1913 (void) close(s); 1914 errno = t; 1915 return (NULL); 1916} 1917 1918static FILE * 1919dataconn(char *name, off_t size, char *mode) 1920{ 1921 char sizebuf[32]; 1922 FILE *file; 1923 int retry = 0, tos, conerrno; 1924 1925 file_size = size; 1926 byte_count = 0; 1927 if (size != -1) 1928 (void) snprintf(sizebuf, sizeof(sizebuf), 1929 " (%jd bytes)", (intmax_t)size); 1930 else 1931 *sizebuf = '\0'; 1932 if (pdata >= 0) { 1933 union sockunion from; 1934 socklen_t fromlen = ctrl_addr.su_len; 1935 int flags, s; 1936 struct timeval timeout; 1937 fd_set set; 1938 1939 FD_ZERO(&set); 1940 FD_SET(pdata, &set); 1941 1942 timeout.tv_usec = 0; 1943 timeout.tv_sec = 120; 1944 1945 /* 1946 * Granted a socket is in the blocking I/O mode, 1947 * accept() will block after a successful select() 1948 * if the selected connection dies in between. 1949 * Therefore set the non-blocking I/O flag here. 1950 */ 1951 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1952 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1953 goto pdata_err; 1954 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1955 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1956 goto pdata_err; 1957 (void) close(pdata); 1958 pdata = s; 1959 /* 1960 * Unset the inherited non-blocking I/O flag 1961 * on the child socket so stdio can work on it. 1962 */ 1963 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1964 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1965 goto pdata_err; 1966#ifdef IP_TOS 1967 if (from.su_family == AF_INET) 1968 { 1969 tos = IPTOS_THROUGHPUT; 1970 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1971 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1972 } 1973#endif 1974 reply(150, "Opening %s mode data connection for '%s'%s.", 1975 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1976 return (fdopen(pdata, mode)); 1977pdata_err: 1978 reply(425, "Can't open data connection."); 1979 (void) close(pdata); 1980 pdata = -1; 1981 return (NULL); 1982 } 1983 if (data >= 0) { 1984 reply(125, "Using existing data connection for '%s'%s.", 1985 name, sizebuf); 1986 usedefault = 1; 1987 return (fdopen(data, mode)); 1988 } 1989 if (usedefault) 1990 data_dest = his_addr; 1991 usedefault = 1; 1992 do { 1993 file = getdatasock(mode); 1994 if (file == NULL) { 1995 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1996 1997 if (getnameinfo((struct sockaddr *)&data_source, 1998 data_source.su_len, 1999 hostbuf, sizeof(hostbuf) - 1, 2000 portbuf, sizeof(portbuf) - 1, 2001 NI_NUMERICHOST|NI_NUMERICSERV)) 2002 *hostbuf = *portbuf = 0; 2003 hostbuf[sizeof(hostbuf) - 1] = 0; 2004 portbuf[sizeof(portbuf) - 1] = 0; 2005 reply(425, "Can't create data socket (%s,%s): %s.", 2006 hostbuf, portbuf, strerror(errno)); 2007 return (NULL); 2008 } 2009 data = fileno(file); 2010 conerrno = 0; 2011 if (connect(data, (struct sockaddr *)&data_dest, 2012 data_dest.su_len) == 0) 2013 break; 2014 conerrno = errno; 2015 (void) fclose(file); 2016 data = -1; 2017 if (conerrno == EADDRINUSE) { 2018 sleep(swaitint); 2019 retry += swaitint; 2020 } else { 2021 break; 2022 } 2023 } while (retry <= swaitmax); 2024 if (conerrno != 0) { 2025 reply(425, "Can't build data connection: %s.", 2026 strerror(conerrno)); 2027 return (NULL); 2028 } 2029 reply(150, "Opening %s mode data connection for '%s'%s.", 2030 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2031 return (file); 2032} 2033 2034/* 2035 * A helper macro to avoid code duplication 2036 * in send_data() and receive_data(). 2037 * 2038 * XXX We have to block SIGURG during putc() because BSD stdio 2039 * is unable to restart interrupted write operations and hence 2040 * the entire buffer contents will be lost as soon as a write() 2041 * call indicates EINTR to stdio. 2042 */ 2043#define FTPD_PUTC(ch, file, label) \ 2044 do { \ 2045 int ret; \ 2046 \ 2047 do { \ 2048 START_UNSAFE; \ 2049 ret = putc((ch), (file)); \ 2050 END_UNSAFE; \ 2051 CHECKOOB(return (-1)) \ 2052 else if (ferror(file)) \ 2053 goto label; \ 2054 clearerr(file); \ 2055 } while (ret == EOF); \ 2056 } while (0) 2057 2058/* 2059 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2060 * encapsulation of the data subject to Mode, Structure, and Type. 2061 * 2062 * NB: Form isn't handled. 2063 */ 2064static int 2065send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2066{ 2067 int c, cp, filefd, netfd; 2068 char *buf; 2069 2070 STARTXFER; 2071 2072 switch (type) { 2073 2074 case TYPE_A: 2075 cp = EOF; 2076 for (;;) { 2077 c = getc(instr); 2078 CHECKOOB(return (-1)) 2079 else if (c == EOF && ferror(instr)) 2080 goto file_err; 2081 if (c == EOF) { 2082 if (ferror(instr)) { /* resume after OOB */ 2083 clearerr(instr); 2084 continue; 2085 } 2086 if (feof(instr)) /* EOF */ 2087 break; 2088 syslog(LOG_ERR, "Internal: impossible condition" 2089 " on file after getc()"); 2090 goto file_err; 2091 } 2092 if (c == '\n' && cp != '\r') { 2093 FTPD_PUTC('\r', outstr, data_err); 2094 byte_count++; 2095 } 2096 FTPD_PUTC(c, outstr, data_err); 2097 byte_count++; 2098 cp = c; 2099 } 2100#ifdef notyet /* BSD stdio isn't ready for that */ 2101 while (fflush(outstr) == EOF) { 2102 CHECKOOB(return (-1)) 2103 else 2104 goto data_err; 2105 clearerr(outstr); 2106 } 2107 ENDXFER; 2108#else 2109 ENDXFER; 2110 if (fflush(outstr) == EOF) 2111 goto data_err; 2112#endif 2113 reply(226, "Transfer complete."); 2114 return (0); 2115 2116 case TYPE_I: 2117 case TYPE_L: 2118 /* 2119 * isreg is only set if we are not doing restart and we 2120 * are sending a regular file 2121 */ 2122 netfd = fileno(outstr); 2123 filefd = fileno(instr); 2124 2125 if (isreg) { 2126 char *msg = "Transfer complete."; 2127 off_t cnt, offset; 2128 int err; 2129 2130 cnt = offset = 0; 2131 2132 while (filesize > 0) { 2133 err = sendfile(filefd, netfd, offset, 0, 2134 NULL, &cnt, 0); 2135 /* 2136 * Calculate byte_count before OOB processing. 2137 * It can be used in myoob() later. 2138 */ 2139 byte_count += cnt; 2140 offset += cnt; 2141 filesize -= cnt; 2142 CHECKOOB(return (-1)) 2143 else if (err == -1) { 2144 if (errno != EINTR && 2145 cnt == 0 && offset == 0) 2146 goto oldway; 2147 goto data_err; 2148 } 2149 if (err == -1) /* resume after OOB */ 2150 continue; 2151 /* 2152 * We hit the EOF prematurely. 2153 * Perhaps the file was externally truncated. 2154 */ 2155 if (cnt == 0) { 2156 msg = "Transfer finished due to " 2157 "premature end of file."; 2158 break; 2159 } 2160 } 2161 ENDXFER; 2162 reply(226, "%s", msg); 2163 return (0); 2164 } 2165 2166oldway: 2167 if ((buf = malloc(blksize)) == NULL) { 2168 ENDXFER; 2169 reply(451, "Ran out of memory."); 2170 return (-1); 2171 } 2172 2173 for (;;) { 2174 int cnt, len; 2175 char *bp; 2176 2177 cnt = read(filefd, buf, blksize); 2178 CHECKOOB(free(buf); return (-1)) 2179 else if (cnt < 0) { 2180 free(buf); 2181 goto file_err; 2182 } 2183 if (cnt < 0) /* resume after OOB */ 2184 continue; 2185 if (cnt == 0) /* EOF */ 2186 break; 2187 for (len = cnt, bp = buf; len > 0;) { 2188 cnt = write(netfd, bp, len); 2189 CHECKOOB(free(buf); return (-1)) 2190 else if (cnt < 0) { 2191 free(buf); 2192 goto data_err; 2193 } 2194 if (cnt <= 0) 2195 continue; 2196 len -= cnt; 2197 bp += cnt; 2198 byte_count += cnt; 2199 } 2200 } 2201 ENDXFER; 2202 free(buf); 2203 reply(226, "Transfer complete."); 2204 return (0); 2205 default: 2206 ENDXFER; 2207 reply(550, "Unimplemented TYPE %d in send_data.", type); 2208 return (-1); 2209 } 2210 2211data_err: 2212 ENDXFER; 2213 perror_reply(426, "Data connection"); 2214 return (-1); 2215 2216file_err: 2217 ENDXFER; 2218 perror_reply(551, "Error on input file"); 2219 return (-1); 2220} 2221 2222/* 2223 * Transfer data from peer to "outstr" using the appropriate encapulation of 2224 * the data subject to Mode, Structure, and Type. 2225 * 2226 * N.B.: Form isn't handled. 2227 */ 2228static int 2229receive_data(FILE *instr, FILE *outstr) 2230{ 2231 int c, cp; 2232 int bare_lfs = 0; 2233 2234 STARTXFER; 2235 2236 switch (type) { 2237 2238 case TYPE_I: 2239 case TYPE_L: 2240 for (;;) { 2241 int cnt, len; 2242 char *bp; 2243 char buf[BUFSIZ]; 2244 2245 cnt = read(fileno(instr), buf, sizeof(buf)); 2246 CHECKOOB(return (-1)) 2247 else if (cnt < 0) 2248 goto data_err; 2249 if (cnt < 0) /* resume after OOB */ 2250 continue; 2251 if (cnt == 0) /* EOF */ 2252 break; 2253 for (len = cnt, bp = buf; len > 0;) { 2254 cnt = write(fileno(outstr), bp, len); 2255 CHECKOOB(return (-1)) 2256 else if (cnt < 0) 2257 goto file_err; 2258 if (cnt <= 0) 2259 continue; 2260 len -= cnt; 2261 bp += cnt; 2262 byte_count += cnt; 2263 } 2264 } 2265 ENDXFER; 2266 return (0); 2267 2268 case TYPE_E: 2269 ENDXFER; 2270 reply(553, "TYPE E not implemented."); 2271 return (-1); 2272 2273 case TYPE_A: 2274 cp = EOF; 2275 for (;;) { 2276 c = getc(instr); 2277 CHECKOOB(return (-1)) 2278 else if (c == EOF && ferror(instr)) 2279 goto data_err; 2280 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2281 clearerr(instr); 2282 continue; 2283 } 2284 2285 if (cp == '\r') { 2286 if (c != '\n') 2287 FTPD_PUTC('\r', outstr, file_err); 2288 } else 2289 if (c == '\n') 2290 bare_lfs++; 2291 if (c == '\r') { 2292 byte_count++; 2293 cp = c; 2294 continue; 2295 } 2296 2297 /* Check for EOF here in order not to lose last \r. */ 2298 if (c == EOF) { 2299 if (feof(instr)) /* EOF */ 2300 break; 2301 syslog(LOG_ERR, "Internal: impossible condition" 2302 " on data stream after getc()"); 2303 goto data_err; 2304 } 2305 2306 byte_count++; 2307 FTPD_PUTC(c, outstr, file_err); 2308 cp = c; 2309 } 2310#ifdef notyet /* BSD stdio isn't ready for that */ 2311 while (fflush(outstr) == EOF) { 2312 CHECKOOB(return (-1)) 2313 else 2314 goto file_err; 2315 clearerr(outstr); 2316 } 2317 ENDXFER; 2318#else 2319 ENDXFER; 2320 if (fflush(outstr) == EOF) 2321 goto file_err; 2322#endif 2323 if (bare_lfs) { 2324 lreply(226, 2325 "WARNING! %d bare linefeeds received in ASCII mode.", 2326 bare_lfs); 2327 (void)printf(" File may not have transferred correctly.\r\n"); 2328 } 2329 return (0); 2330 default: 2331 ENDXFER; 2332 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2333 return (-1); 2334 } 2335 2336data_err: 2337 ENDXFER; 2338 perror_reply(426, "Data connection"); 2339 return (-1); 2340 2341file_err: 2342 ENDXFER; 2343 perror_reply(452, "Error writing to file"); 2344 return (-1); 2345} 2346 2347void 2348statfilecmd(char *filename) 2349{ 2350 FILE *fin; 2351 int atstart; 2352 int c, code; 2353 char line[LINE_MAX]; 2354 struct stat st; 2355 2356 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2357 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2358 fin = ftpd_popen(line, "r"); 2359 if (fin == NULL) { 2360 perror_reply(551, filename); 2361 return; 2362 } 2363 lreply(code, "Status of %s:", filename); 2364 atstart = 1; 2365 while ((c = getc(fin)) != EOF) { 2366 if (c == '\n') { 2367 if (ferror(stdout)){ 2368 perror_reply(421, "Control connection"); 2369 (void) ftpd_pclose(fin); 2370 dologout(1); 2371 /* NOTREACHED */ 2372 } 2373 if (ferror(fin)) { 2374 perror_reply(551, filename); 2375 (void) ftpd_pclose(fin); 2376 return; 2377 } 2378 (void) putc('\r', stdout); 2379 } 2380 /* 2381 * RFC 959 says neutral text should be prepended before 2382 * a leading 3-digit number followed by whitespace, but 2383 * many ftp clients can be confused by any leading digits, 2384 * as a matter of fact. 2385 */ 2386 if (atstart && isdigit(c)) 2387 (void) putc(' ', stdout); 2388 (void) putc(c, stdout); 2389 atstart = (c == '\n'); 2390 } 2391 (void) ftpd_pclose(fin); 2392 reply(code, "End of status."); 2393} 2394 2395void 2396statcmd(void) 2397{ 2398 union sockunion *su; 2399 u_char *a, *p; 2400 char hname[NI_MAXHOST]; 2401 int ispassive; 2402 2403 if (hostinfo) { 2404 lreply(211, "%s FTP server status:", hostname); 2405 printf(" %s\r\n", version); 2406 } else 2407 lreply(211, "FTP server status:"); 2408 printf(" Connected to %s", remotehost); 2409 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2410 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2411 hname[sizeof(hname) - 1] = 0; 2412 if (strcmp(hname, remotehost) != 0) 2413 printf(" (%s)", hname); 2414 } 2415 printf("\r\n"); 2416 if (logged_in) { 2417 if (guest) 2418 printf(" Logged in anonymously\r\n"); 2419 else 2420 printf(" Logged in as %s\r\n", pw->pw_name); 2421 } else if (askpasswd) 2422 printf(" Waiting for password\r\n"); 2423 else 2424 printf(" Waiting for user name\r\n"); 2425 printf(" TYPE: %s", typenames[type]); 2426 if (type == TYPE_A || type == TYPE_E) 2427 printf(", FORM: %s", formnames[form]); 2428 if (type == TYPE_L) 2429#if CHAR_BIT == 8 2430 printf(" %d", CHAR_BIT); 2431#else 2432 printf(" %d", bytesize); /* need definition! */ 2433#endif 2434 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2435 strunames[stru], modenames[mode]); 2436 if (data != -1) 2437 printf(" Data connection open\r\n"); 2438 else if (pdata != -1) { 2439 ispassive = 1; 2440 su = &pasv_addr; 2441 goto printaddr; 2442 } else if (usedefault == 0) { 2443 ispassive = 0; 2444 su = &data_dest; 2445printaddr: 2446#define UC(b) (((int) b) & 0xff) 2447 if (epsvall) { 2448 printf(" EPSV only mode (EPSV ALL)\r\n"); 2449 goto epsvonly; 2450 } 2451 2452 /* PORT/PASV */ 2453 if (su->su_family == AF_INET) { 2454 a = (u_char *) &su->su_sin.sin_addr; 2455 p = (u_char *) &su->su_sin.sin_port; 2456 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2457 ispassive ? "PASV" : "PORT", 2458 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2459 UC(p[0]), UC(p[1])); 2460 } 2461 2462 /* LPRT/LPSV */ 2463 { 2464 int alen, af, i; 2465 2466 switch (su->su_family) { 2467 case AF_INET: 2468 a = (u_char *) &su->su_sin.sin_addr; 2469 p = (u_char *) &su->su_sin.sin_port; 2470 alen = sizeof(su->su_sin.sin_addr); 2471 af = 4; 2472 break; 2473 case AF_INET6: 2474 a = (u_char *) &su->su_sin6.sin6_addr; 2475 p = (u_char *) &su->su_sin6.sin6_port; 2476 alen = sizeof(su->su_sin6.sin6_addr); 2477 af = 6; 2478 break; 2479 default: 2480 af = 0; 2481 break; 2482 } 2483 if (af) { 2484 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2485 af, alen); 2486 for (i = 0; i < alen; i++) 2487 printf("%d,", UC(a[i])); 2488 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2489 } 2490 } 2491 2492epsvonly:; 2493 /* EPRT/EPSV */ 2494 { 2495 int af; 2496 2497 switch (su->su_family) { 2498 case AF_INET: 2499 af = 1; 2500 break; 2501 case AF_INET6: 2502 af = 2; 2503 break; 2504 default: 2505 af = 0; 2506 break; 2507 } 2508 if (af) { 2509 union sockunion tmp; 2510 2511 tmp = *su; 2512 if (tmp.su_family == AF_INET6) 2513 tmp.su_sin6.sin6_scope_id = 0; 2514 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2515 hname, sizeof(hname) - 1, NULL, 0, 2516 NI_NUMERICHOST)) { 2517 hname[sizeof(hname) - 1] = 0; 2518 printf(" %s |%d|%s|%d|\r\n", 2519 ispassive ? "EPSV" : "EPRT", 2520 af, hname, htons(tmp.su_port)); 2521 } 2522 } 2523 } 2524#undef UC 2525 } else 2526 printf(" No data connection\r\n"); 2527 reply(211, "End of status."); 2528} 2529 2530void 2531fatalerror(char *s) 2532{ 2533 2534 reply(451, "Error in server: %s", s); 2535 reply(221, "Closing connection due to server error."); 2536 dologout(0); 2537 /* NOTREACHED */ 2538} 2539 2540void 2541reply(int n, const char *fmt, ...) 2542{ 2543 va_list ap; 2544 2545 (void)printf("%d ", n); 2546 va_start(ap, fmt); 2547 (void)vprintf(fmt, ap); 2548 va_end(ap); 2549 (void)printf("\r\n"); 2550 (void)fflush(stdout); 2551 if (ftpdebug) { 2552 syslog(LOG_DEBUG, "<--- %d ", n); 2553 va_start(ap, fmt); 2554 vsyslog(LOG_DEBUG, fmt, ap); 2555 va_end(ap); 2556 } 2557} 2558 2559void 2560lreply(int n, const char *fmt, ...) 2561{ 2562 va_list ap; 2563 2564 (void)printf("%d- ", n); 2565 va_start(ap, fmt); 2566 (void)vprintf(fmt, ap); 2567 va_end(ap); 2568 (void)printf("\r\n"); 2569 (void)fflush(stdout); 2570 if (ftpdebug) { 2571 syslog(LOG_DEBUG, "<--- %d- ", n); 2572 va_start(ap, fmt); 2573 vsyslog(LOG_DEBUG, fmt, ap); 2574 va_end(ap); 2575 } 2576} 2577 2578static void 2579ack(char *s) 2580{ 2581 2582 reply(250, "%s command successful.", s); 2583} 2584 2585void 2586nack(char *s) 2587{ 2588 2589 reply(502, "%s command not implemented.", s); 2590} 2591 2592/* ARGSUSED */ 2593void 2594yyerror(char *s) 2595{ 2596 char *cp; 2597 2598 if ((cp = strchr(cbuf,'\n'))) 2599 *cp = '\0'; 2600 reply(500, "%s: command not understood.", cbuf); 2601} 2602 2603void 2604delete(char *name) 2605{ 2606 struct stat st; 2607 2608 LOGCMD("delete", name); 2609 if (lstat(name, &st) < 0) { 2610 perror_reply(550, name); 2611 return; 2612 } 2613 if (S_ISDIR(st.st_mode)) { 2614 if (rmdir(name) < 0) { 2615 perror_reply(550, name); 2616 return; 2617 } 2618 goto done; 2619 } 2620 if (guest && noguestmod) { 2621 reply(550, "Operation not permitted."); 2622 return; 2623 } 2624 if (unlink(name) < 0) { 2625 perror_reply(550, name); 2626 return; 2627 } 2628done: 2629 ack("DELE"); 2630} 2631 2632void 2633cwd(char *path) 2634{ 2635 2636 if (chdir(path) < 0) 2637 perror_reply(550, path); 2638 else 2639 ack("CWD"); 2640} 2641 2642void 2643makedir(char *name) 2644{ 2645 char *s; 2646 2647 LOGCMD("mkdir", name); 2648 if (guest && noguestmkd) 2649 reply(550, "Operation not permitted."); 2650 else if (mkdir(name, 0777) < 0) 2651 perror_reply(550, name); 2652 else { 2653 if ((s = doublequote(name)) == NULL) 2654 fatalerror("Ran out of memory."); 2655 reply(257, "\"%s\" directory created.", s); 2656 free(s); 2657 } 2658} 2659 2660void 2661removedir(char *name) 2662{ 2663 2664 LOGCMD("rmdir", name); 2665 if (rmdir(name) < 0) 2666 perror_reply(550, name); 2667 else 2668 ack("RMD"); 2669} 2670 2671void 2672pwd(void) 2673{ 2674 char *s, path[MAXPATHLEN + 1]; 2675 2676 if (getcwd(path, sizeof(path)) == NULL) 2677 perror_reply(550, "Get current directory"); 2678 else { 2679 if ((s = doublequote(path)) == NULL) 2680 fatalerror("Ran out of memory."); 2681 reply(257, "\"%s\" is current directory.", s); 2682 free(s); 2683 } 2684} 2685 2686char * 2687renamefrom(char *name) 2688{ 2689 struct stat st; 2690 2691 if (guest && noguestmod) { 2692 reply(550, "Operation not permitted."); 2693 return (NULL); 2694 } 2695 if (lstat(name, &st) < 0) { 2696 perror_reply(550, name); 2697 return (NULL); 2698 } 2699 reply(350, "File exists, ready for destination name."); 2700 return (name); 2701} 2702 2703void 2704renamecmd(char *from, char *to) 2705{ 2706 struct stat st; 2707 2708 LOGCMD2("rename", from, to); 2709 2710 if (guest && (stat(to, &st) == 0)) { 2711 reply(550, "%s: permission denied.", to); 2712 return; 2713 } 2714 2715 if (rename(from, to) < 0) 2716 perror_reply(550, "rename"); 2717 else 2718 ack("RNTO"); 2719} 2720 2721static void 2722dolog(struct sockaddr *who) 2723{ 2724 char who_name[NI_MAXHOST]; 2725 2726 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2727 remotehost[sizeof(remotehost) - 1] = 0; 2728 if (getnameinfo(who, who->sa_len, 2729 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2730 *who_name = 0; 2731 who_name[sizeof(who_name) - 1] = 0; 2732 2733#ifdef SETPROCTITLE 2734#ifdef VIRTUAL_HOSTING 2735 if (thishost != firsthost) 2736 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2737 remotehost, hostname); 2738 else 2739#endif 2740 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2741 remotehost); 2742 setproctitle("%s", proctitle); 2743#endif /* SETPROCTITLE */ 2744 2745 if (logging) { 2746#ifdef VIRTUAL_HOSTING 2747 if (thishost != firsthost) 2748 syslog(LOG_INFO, "connection from %s (%s) to %s", 2749 remotehost, who_name, hostname); 2750 else 2751#endif 2752 syslog(LOG_INFO, "connection from %s (%s)", 2753 remotehost, who_name); 2754 } 2755} 2756 2757/* 2758 * Record logout in wtmp file 2759 * and exit with supplied status. 2760 */ 2761void 2762dologout(int status) 2763{ 2764 2765 if (logged_in && dowtmp) { 2766 (void) seteuid(0); 2767#ifdef LOGIN_CAP 2768 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 2769 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 2770 LOGIN_SETENV)); 2771#endif 2772 ftpd_logwtmp(wtmpid, NULL, NULL); 2773 } 2774 /* beware of flushing buffers after a SIGPIPE */ 2775 _exit(status); 2776} 2777 2778static void 2779sigurg(int signo) 2780{ 2781 2782 recvurg = 1; 2783} 2784 2785static void 2786maskurg(int flag) 2787{ 2788 int oerrno; 2789 sigset_t sset; 2790 2791 if (!transflag) { 2792 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2793 return; 2794 } 2795 oerrno = errno; 2796 sigemptyset(&sset); 2797 sigaddset(&sset, SIGURG); 2798 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2799 errno = oerrno; 2800} 2801 2802static void 2803flagxfer(int flag) 2804{ 2805 2806 if (flag) { 2807 if (transflag) 2808 syslog(LOG_ERR, "Internal: flagxfer(1): " 2809 "transfer already under way"); 2810 transflag = 1; 2811 maskurg(0); 2812 recvurg = 0; 2813 } else { 2814 if (!transflag) 2815 syslog(LOG_ERR, "Internal: flagxfer(0): " 2816 "no active transfer"); 2817 maskurg(1); 2818 transflag = 0; 2819 } 2820} 2821 2822/* 2823 * Returns 0 if OK to resume or -1 if abort requested. 2824 */ 2825static int 2826myoob(void) 2827{ 2828 char *cp; 2829 int ret; 2830 2831 if (!transflag) { 2832 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2833 return (0); 2834 } 2835 cp = tmpline; 2836 ret = getline(cp, 7, stdin); 2837 if (ret == -1) { 2838 reply(221, "You could at least say goodbye."); 2839 dologout(0); 2840 } else if (ret == -2) { 2841 /* Ignore truncated command. */ 2842 return (0); 2843 } 2844 upper(cp); 2845 if (strcmp(cp, "ABOR\r\n") == 0) { 2846 tmpline[0] = '\0'; 2847 reply(426, "Transfer aborted. Data connection closed."); 2848 reply(226, "Abort successful."); 2849 return (-1); 2850 } 2851 if (strcmp(cp, "STAT\r\n") == 0) { 2852 tmpline[0] = '\0'; 2853 if (file_size != -1) 2854 reply(213, "Status: %jd of %jd bytes transferred.", 2855 (intmax_t)byte_count, (intmax_t)file_size); 2856 else 2857 reply(213, "Status: %jd bytes transferred.", 2858 (intmax_t)byte_count); 2859 } 2860 return (0); 2861} 2862 2863/* 2864 * Note: a response of 425 is not mentioned as a possible response to 2865 * the PASV command in RFC959. However, it has been blessed as 2866 * a legitimate response by Jon Postel in a telephone conversation 2867 * with Rick Adams on 25 Jan 89. 2868 */ 2869void 2870passive(void) 2871{ 2872 socklen_t len; 2873 int on; 2874 char *p, *a; 2875 2876 if (pdata >= 0) /* close old port if one set */ 2877 close(pdata); 2878 2879 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2880 if (pdata < 0) { 2881 perror_reply(425, "Can't open passive connection"); 2882 return; 2883 } 2884 on = 1; 2885 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2886 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2887 2888 (void) seteuid(0); 2889 2890#ifdef IP_PORTRANGE 2891 if (ctrl_addr.su_family == AF_INET) { 2892 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2893 : IP_PORTRANGE_DEFAULT; 2894 2895 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2896 &on, sizeof(on)) < 0) 2897 goto pasv_error; 2898 } 2899#endif 2900#ifdef IPV6_PORTRANGE 2901 if (ctrl_addr.su_family == AF_INET6) { 2902 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2903 : IPV6_PORTRANGE_DEFAULT; 2904 2905 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2906 &on, sizeof(on)) < 0) 2907 goto pasv_error; 2908 } 2909#endif 2910 2911 pasv_addr = ctrl_addr; 2912 pasv_addr.su_port = 0; 2913 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2914 goto pasv_error; 2915 2916 (void) seteuid(pw->pw_uid); 2917 2918 len = sizeof(pasv_addr); 2919 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2920 goto pasv_error; 2921 if (listen(pdata, 1) < 0) 2922 goto pasv_error; 2923 if (pasv_addr.su_family == AF_INET) 2924 a = (char *) &pasv_addr.su_sin.sin_addr; 2925 else if (pasv_addr.su_family == AF_INET6 && 2926 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2927 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2928 else 2929 goto pasv_error; 2930 2931 p = (char *) &pasv_addr.su_port; 2932 2933#define UC(b) (((int) b) & 0xff) 2934 2935 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2936 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2937 return; 2938 2939pasv_error: 2940 (void) seteuid(pw->pw_uid); 2941 (void) close(pdata); 2942 pdata = -1; 2943 perror_reply(425, "Can't open passive connection"); 2944 return; 2945} 2946 2947/* 2948 * Long Passive defined in RFC 1639. 2949 * 228 Entering Long Passive Mode 2950 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2951 */ 2952 2953void 2954long_passive(char *cmd, int pf) 2955{ 2956 socklen_t len; 2957 int on; 2958 char *p, *a; 2959 2960 if (pdata >= 0) /* close old port if one set */ 2961 close(pdata); 2962 2963 if (pf != PF_UNSPEC) { 2964 if (ctrl_addr.su_family != pf) { 2965 switch (ctrl_addr.su_family) { 2966 case AF_INET: 2967 pf = 1; 2968 break; 2969 case AF_INET6: 2970 pf = 2; 2971 break; 2972 default: 2973 pf = 0; 2974 break; 2975 } 2976 /* 2977 * XXX 2978 * only EPRT/EPSV ready clients will understand this 2979 */ 2980 if (strcmp(cmd, "EPSV") == 0 && pf) { 2981 reply(522, "Network protocol mismatch, " 2982 "use (%d)", pf); 2983 } else 2984 reply(501, "Network protocol mismatch."); /*XXX*/ 2985 2986 return; 2987 } 2988 } 2989 2990 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2991 if (pdata < 0) { 2992 perror_reply(425, "Can't open passive connection"); 2993 return; 2994 } 2995 on = 1; 2996 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2997 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2998 2999 (void) seteuid(0); 3000 3001 pasv_addr = ctrl_addr; 3002 pasv_addr.su_port = 0; 3003 len = pasv_addr.su_len; 3004 3005#ifdef IP_PORTRANGE 3006 if (ctrl_addr.su_family == AF_INET) { 3007 on = restricted_data_ports ? IP_PORTRANGE_HIGH 3008 : IP_PORTRANGE_DEFAULT; 3009 3010 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 3011 &on, sizeof(on)) < 0) 3012 goto pasv_error; 3013 } 3014#endif 3015#ifdef IPV6_PORTRANGE 3016 if (ctrl_addr.su_family == AF_INET6) { 3017 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 3018 : IPV6_PORTRANGE_DEFAULT; 3019 3020 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 3021 &on, sizeof(on)) < 0) 3022 goto pasv_error; 3023 } 3024#endif 3025 3026 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 3027 goto pasv_error; 3028 3029 (void) seteuid(pw->pw_uid); 3030 3031 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 3032 goto pasv_error; 3033 if (listen(pdata, 1) < 0) 3034 goto pasv_error; 3035 3036#define UC(b) (((int) b) & 0xff) 3037 3038 if (strcmp(cmd, "LPSV") == 0) { 3039 p = (char *)&pasv_addr.su_port; 3040 switch (pasv_addr.su_family) { 3041 case AF_INET: 3042 a = (char *) &pasv_addr.su_sin.sin_addr; 3043 v4_reply: 3044 reply(228, 3045"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3046 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3047 2, UC(p[0]), UC(p[1])); 3048 return; 3049 case AF_INET6: 3050 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3051 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3052 goto v4_reply; 3053 } 3054 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3055 reply(228, 3056"Entering Long Passive Mode " 3057"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3058 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3059 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3060 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3061 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3062 2, UC(p[0]), UC(p[1])); 3063 return; 3064 } 3065 } else if (strcmp(cmd, "EPSV") == 0) { 3066 switch (pasv_addr.su_family) { 3067 case AF_INET: 3068 case AF_INET6: 3069 reply(229, "Entering Extended Passive Mode (|||%d|)", 3070 ntohs(pasv_addr.su_port)); 3071 return; 3072 } 3073 } else { 3074 /* more proper error code? */ 3075 } 3076 3077pasv_error: 3078 (void) seteuid(pw->pw_uid); 3079 (void) close(pdata); 3080 pdata = -1; 3081 perror_reply(425, "Can't open passive connection"); 3082 return; 3083} 3084 3085/* 3086 * Generate unique name for file with basename "local" 3087 * and open the file in order to avoid possible races. 3088 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3089 * Return descriptor to the file, set "name" to its name. 3090 * 3091 * Generates failure reply on error. 3092 */ 3093static int 3094guniquefd(char *local, char **name) 3095{ 3096 static char new[MAXPATHLEN]; 3097 struct stat st; 3098 char *cp; 3099 int count; 3100 int fd; 3101 3102 cp = strrchr(local, '/'); 3103 if (cp) 3104 *cp = '\0'; 3105 if (stat(cp ? local : ".", &st) < 0) { 3106 perror_reply(553, cp ? local : "."); 3107 return (-1); 3108 } 3109 if (cp) { 3110 /* 3111 * Let not overwrite dirname with counter suffix. 3112 * -4 is for /nn\0 3113 * In this extreme case dot won't be put in front of suffix. 3114 */ 3115 if (strlen(local) > sizeof(new) - 4) { 3116 reply(553, "Pathname too long."); 3117 return (-1); 3118 } 3119 *cp = '/'; 3120 } 3121 /* -4 is for the .nn<null> we put on the end below */ 3122 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3123 cp = new + strlen(new); 3124 /* 3125 * Don't generate dotfile unless requested explicitly. 3126 * This covers the case when basename gets truncated off 3127 * by buffer size. 3128 */ 3129 if (cp > new && cp[-1] != '/') 3130 *cp++ = '.'; 3131 for (count = 0; count < 100; count++) { 3132 /* At count 0 try unmodified name */ 3133 if (count) 3134 (void)sprintf(cp, "%d", count); 3135 if ((fd = open(count ? new : local, 3136 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3137 *name = count ? new : local; 3138 return (fd); 3139 } 3140 if (errno != EEXIST) { 3141 perror_reply(553, count ? new : local); 3142 return (-1); 3143 } 3144 } 3145 reply(452, "Unique file name cannot be created."); 3146 return (-1); 3147} 3148 3149/* 3150 * Format and send reply containing system error number. 3151 */ 3152void 3153perror_reply(int code, char *string) 3154{ 3155 3156 reply(code, "%s: %s.", string, strerror(errno)); 3157} 3158 3159static char *onefile[] = { 3160 "", 3161 0 3162}; 3163 3164void 3165send_file_list(char *whichf) 3166{ 3167 struct stat st; 3168 DIR *dirp = NULL; 3169 struct dirent *dir; 3170 FILE *dout = NULL; 3171 char **dirlist, *dirname; 3172 int simple = 0; 3173 int freeglob = 0; 3174 glob_t gl; 3175 3176 if (strpbrk(whichf, "~{[*?") != NULL) { 3177 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3178 3179 memset(&gl, 0, sizeof(gl)); 3180 gl.gl_matchc = MAXGLOBARGS; 3181 flags |= GLOB_LIMIT; 3182 freeglob = 1; 3183 if (glob(whichf, flags, 0, &gl)) { 3184 reply(550, "No matching files found."); 3185 goto out; 3186 } else if (gl.gl_pathc == 0) { 3187 errno = ENOENT; 3188 perror_reply(550, whichf); 3189 goto out; 3190 } 3191 dirlist = gl.gl_pathv; 3192 } else { 3193 onefile[0] = whichf; 3194 dirlist = onefile; 3195 simple = 1; 3196 } 3197 3198 while ((dirname = *dirlist++)) { 3199 if (stat(dirname, &st) < 0) { 3200 /* 3201 * If user typed "ls -l", etc, and the client 3202 * used NLST, do what the user meant. 3203 */ 3204 if (dirname[0] == '-' && *dirlist == NULL && 3205 dout == NULL) 3206 retrieve(_PATH_LS " %s", dirname); 3207 else 3208 perror_reply(550, whichf); 3209 goto out; 3210 } 3211 3212 if (S_ISREG(st.st_mode)) { 3213 if (dout == NULL) { 3214 dout = dataconn("file list", -1, "w"); 3215 if (dout == NULL) 3216 goto out; 3217 STARTXFER; 3218 } 3219 START_UNSAFE; 3220 fprintf(dout, "%s%s\n", dirname, 3221 type == TYPE_A ? "\r" : ""); 3222 END_UNSAFE; 3223 if (ferror(dout)) 3224 goto data_err; 3225 byte_count += strlen(dirname) + 3226 (type == TYPE_A ? 2 : 1); 3227 CHECKOOB(goto abrt); 3228 continue; 3229 } else if (!S_ISDIR(st.st_mode)) 3230 continue; 3231 3232 if ((dirp = opendir(dirname)) == NULL) 3233 continue; 3234 3235 while ((dir = readdir(dirp)) != NULL) { 3236 char nbuf[MAXPATHLEN]; 3237 3238 CHECKOOB(goto abrt); 3239 3240 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3241 continue; 3242 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3243 dir->d_namlen == 2) 3244 continue; 3245 3246 snprintf(nbuf, sizeof(nbuf), 3247 "%s/%s", dirname, dir->d_name); 3248 3249 /* 3250 * We have to do a stat to insure it's 3251 * not a directory or special file. 3252 */ 3253 if (simple || (stat(nbuf, &st) == 0 && 3254 S_ISREG(st.st_mode))) { 3255 if (dout == NULL) { 3256 dout = dataconn("file list", -1, "w"); 3257 if (dout == NULL) 3258 goto out; 3259 STARTXFER; 3260 } 3261 START_UNSAFE; 3262 if (nbuf[0] == '.' && nbuf[1] == '/') 3263 fprintf(dout, "%s%s\n", &nbuf[2], 3264 type == TYPE_A ? "\r" : ""); 3265 else 3266 fprintf(dout, "%s%s\n", nbuf, 3267 type == TYPE_A ? "\r" : ""); 3268 END_UNSAFE; 3269 if (ferror(dout)) 3270 goto data_err; 3271 byte_count += strlen(nbuf) + 3272 (type == TYPE_A ? 2 : 1); 3273 CHECKOOB(goto abrt); 3274 } 3275 } 3276 (void) closedir(dirp); 3277 dirp = NULL; 3278 } 3279 3280 if (dout == NULL) 3281 reply(550, "No files found."); 3282 else if (ferror(dout)) 3283data_err: perror_reply(550, "Data connection"); 3284 else 3285 reply(226, "Transfer complete."); 3286out: 3287 if (dout) { 3288 ENDXFER; 3289abrt: 3290 (void) fclose(dout); 3291 data = -1; 3292 pdata = -1; 3293 } 3294 if (dirp) 3295 (void) closedir(dirp); 3296 if (freeglob) { 3297 freeglob = 0; 3298 globfree(&gl); 3299 } 3300} 3301 3302void 3303reapchild(int signo) 3304{ 3305 while (waitpid(-1, NULL, WNOHANG) > 0); 3306} 3307 3308#ifdef OLD_SETPROCTITLE 3309/* 3310 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3311 * Warning, since this is usually started from inetd.conf, it often doesn't 3312 * have much of an environment or arglist to overwrite. 3313 */ 3314void 3315setproctitle(const char *fmt, ...) 3316{ 3317 int i; 3318 va_list ap; 3319 char *p, *bp, ch; 3320 char buf[LINE_MAX]; 3321 3322 va_start(ap, fmt); 3323 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3324 3325 /* make ps print our process name */ 3326 p = Argv[0]; 3327 *p++ = '-'; 3328 3329 i = strlen(buf); 3330 if (i > LastArgv - p - 2) { 3331 i = LastArgv - p - 2; 3332 buf[i] = '\0'; 3333 } 3334 bp = buf; 3335 while (ch = *bp++) 3336 if (ch != '\n' && ch != '\r') 3337 *p++ = ch; 3338 while (p < LastArgv) 3339 *p++ = ' '; 3340} 3341#endif /* OLD_SETPROCTITLE */ 3342 3343static void 3344appendf(char **strp, char *fmt, ...) 3345{ 3346 va_list ap; 3347 char *ostr, *p; 3348 3349 va_start(ap, fmt); 3350 vasprintf(&p, fmt, ap); 3351 va_end(ap); 3352 if (p == NULL) 3353 fatalerror("Ran out of memory."); 3354 if (*strp == NULL) 3355 *strp = p; 3356 else { 3357 ostr = *strp; 3358 asprintf(strp, "%s%s", ostr, p); 3359 if (*strp == NULL) 3360 fatalerror("Ran out of memory."); 3361 free(ostr); 3362 } 3363} 3364 3365static void 3366logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3367{ 3368 char *msg = NULL; 3369 char wd[MAXPATHLEN + 1]; 3370 3371 if (logging <= 1) 3372 return; 3373 3374 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3375 strcpy(wd, strerror(errno)); 3376 3377 appendf(&msg, "%s", cmd); 3378 if (file1) 3379 appendf(&msg, " %s", file1); 3380 if (file2) 3381 appendf(&msg, " %s", file2); 3382 if (cnt >= 0) 3383 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3384 appendf(&msg, " (wd: %s", wd); 3385 if (guest || dochroot) 3386 appendf(&msg, "; chrooted"); 3387 appendf(&msg, ")"); 3388 syslog(LOG_INFO, "%s", msg); 3389 free(msg); 3390} 3391 3392static void 3393logxfer(char *name, off_t size, time_t start) 3394{ 3395 char buf[MAXPATHLEN + 1024]; 3396 char path[MAXPATHLEN + 1]; 3397 time_t now; 3398 3399 if (statfd >= 0) { 3400 time(&now); 3401 if (realpath(name, path) == NULL) { 3402 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3403 return; 3404 } 3405 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3406 ctime(&now)+4, ident, remotehost, 3407 path, (intmax_t)size, 3408 (long)(now - start + (now == start))); 3409 write(statfd, buf, strlen(buf)); 3410 } 3411} 3412 3413static char * 3414doublequote(char *s) 3415{ 3416 int n; 3417 char *p, *s2; 3418 3419 for (p = s, n = 0; *p; p++) 3420 if (*p == '"') 3421 n++; 3422 3423 if ((s2 = malloc(p - s + n + 1)) == NULL) 3424 return (NULL); 3425 3426 for (p = s2; *s; s++, p++) { 3427 if ((*p = *s) == '"') 3428 *(++p) = '"'; 3429 } 3430 *p = '\0'; 3431 3432 return (s2); 3433} 3434 3435/* setup server socket for specified address family */ 3436/* if af is PF_UNSPEC more than one socket may be returned */ 3437/* the returned list is dynamically allocated, so caller needs to free it */ 3438static int * 3439socksetup(int af, char *bindname, const char *bindport) 3440{ 3441 struct addrinfo hints, *res, *r; 3442 int error, maxs, *s, *socks; 3443 const int on = 1; 3444 3445 memset(&hints, 0, sizeof(hints)); 3446 hints.ai_flags = AI_PASSIVE; 3447 hints.ai_family = af; 3448 hints.ai_socktype = SOCK_STREAM; 3449 error = getaddrinfo(bindname, bindport, &hints, &res); 3450 if (error) { 3451 syslog(LOG_ERR, "%s", gai_strerror(error)); 3452 if (error == EAI_SYSTEM) 3453 syslog(LOG_ERR, "%s", strerror(errno)); 3454 return NULL; 3455 } 3456 3457 /* Count max number of sockets we may open */ 3458 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3459 ; 3460 socks = malloc((maxs + 1) * sizeof(int)); 3461 if (!socks) { 3462 freeaddrinfo(res); 3463 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3464 return NULL; 3465 } 3466 3467 *socks = 0; /* num of sockets counter at start of array */ 3468 s = socks + 1; 3469 for (r = res; r; r = r->ai_next) { 3470 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3471 if (*s < 0) { 3472 syslog(LOG_DEBUG, "control socket: %m"); 3473 continue; 3474 } 3475 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3476 &on, sizeof(on)) < 0) 3477 syslog(LOG_WARNING, 3478 "control setsockopt (SO_REUSEADDR): %m"); 3479 if (r->ai_family == AF_INET6) { 3480 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3481 &on, sizeof(on)) < 0) 3482 syslog(LOG_WARNING, 3483 "control setsockopt (IPV6_V6ONLY): %m"); 3484 } 3485 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3486 syslog(LOG_DEBUG, "control bind: %m"); 3487 close(*s); 3488 continue; 3489 } 3490 (*socks)++; 3491 s++; 3492 } 3493 3494 if (res) 3495 freeaddrinfo(res); 3496 3497 if (*socks == 0) { 3498 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3499 free(socks); 3500 return NULL; 3501 } 3502 return(socks); 3503} 3504