ftpd.c revision 262284
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: stable/10/libexec/ftpd/ftpd.c 262284 2014-02-21 09:19:16Z brueffer $"); 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_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 strncpy(curname, name, sizeof(curname)-1); 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 if (logged_in && dowtmp) 1193 ftpd_logwtmp(wtmpid, NULL, NULL); 1194 pw = NULL; 1195#ifdef LOGIN_CAP 1196 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 1197 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 1198 LOGIN_SETENV)); 1199#endif 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_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 if (guest && stats && statfd < 0) 1514#ifdef VIRTUAL_HOSTING 1515 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1516#else 1517 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1518#endif 1519 if (statfd < 0) 1520 stats = 0; 1521 1522 /* 1523 * For a chrooted local user, 1524 * a) see whether ftpchroot(5) specifies a chroot directory, 1525 * b) extract the directory pathname from the line, 1526 * c) expand it to the absolute pathname if necessary. 1527 */ 1528 if (dochroot && residue && 1529 (chrootdir = strtok(residue, " \t")) != NULL) { 1530 if (chrootdir[0] != '/') 1531 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1532 else 1533 chrootdir = strdup(chrootdir); /* make it permanent */ 1534 if (chrootdir == NULL) 1535 fatalerror("Ran out of memory."); 1536 } 1537 if (guest || dochroot) { 1538 /* 1539 * If no chroot directory set yet, use the login directory. 1540 * Copy it so it can be modified while pw->pw_dir stays intact. 1541 */ 1542 if (chrootdir == NULL && 1543 (chrootdir = strdup(pw->pw_dir)) == NULL) 1544 fatalerror("Ran out of memory."); 1545 /* 1546 * Check for the "/chroot/./home" syntax, 1547 * separate the chroot and home directory pathnames. 1548 */ 1549 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1550 *(homedir++) = '\0'; /* wipe '/' */ 1551 homedir++; /* skip '.' */ 1552 } else { 1553 /* 1554 * We MUST do a chdir() after the chroot. Otherwise 1555 * the old current directory will be accessible as "." 1556 * outside the new root! 1557 */ 1558 homedir = "/"; 1559 } 1560 /* 1561 * Finally, do chroot() 1562 */ 1563 if (chroot(chrootdir) < 0) { 1564 reply(550, "Can't change root."); 1565 goto bad; 1566 } 1567 __FreeBSD_libc_enter_restricted_mode(); 1568 } else /* real user w/o chroot */ 1569 homedir = pw->pw_dir; 1570 /* 1571 * Set euid *before* doing chdir() so 1572 * a) the user won't be carried to a directory that he couldn't reach 1573 * on his own due to no permission to upper path components, 1574 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1575 * (uid 0 has no root power over NFS if not mapped explicitly.) 1576 */ 1577 if (seteuid(pw->pw_uid) < 0) { 1578 reply(550, "Can't set uid."); 1579 goto bad; 1580 } 1581 if (chdir(homedir) < 0) { 1582 if (guest || dochroot) { 1583 reply(550, "Can't change to base directory."); 1584 goto bad; 1585 } else { 1586 if (chdir("/") < 0) { 1587 reply(550, "Root is inaccessible."); 1588 goto bad; 1589 } 1590 lreply(230, "No directory! Logging in with home=/."); 1591 } 1592 } 1593 1594 /* 1595 * Display a login message, if it exists. 1596 * N.B. reply(230,) must follow the message. 1597 */ 1598#ifdef VIRTUAL_HOSTING 1599 fd = fopen(thishost->loginmsg, "r"); 1600#else 1601 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1602#endif 1603 if (fd != NULL) { 1604 char *cp, line[LINE_MAX]; 1605 1606 while (fgets(line, sizeof(line), fd) != NULL) { 1607 if ((cp = strchr(line, '\n')) != NULL) 1608 *cp = '\0'; 1609 lreply(230, "%s", line); 1610 } 1611 (void) fflush(stdout); 1612 (void) fclose(fd); 1613 } 1614 if (guest) { 1615 if (ident != NULL) 1616 free(ident); 1617 ident = strdup(passwd); 1618 if (ident == NULL) 1619 fatalerror("Ran out of memory."); 1620 1621 reply(230, "Guest login ok, access restrictions apply."); 1622#ifdef SETPROCTITLE 1623#ifdef VIRTUAL_HOSTING 1624 if (thishost != firsthost) 1625 snprintf(proctitle, sizeof(proctitle), 1626 "%s: anonymous(%s)/%s", remotehost, hostname, 1627 passwd); 1628 else 1629#endif 1630 snprintf(proctitle, sizeof(proctitle), 1631 "%s: anonymous/%s", remotehost, passwd); 1632 setproctitle("%s", proctitle); 1633#endif /* SETPROCTITLE */ 1634 if (logging) 1635 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1636 remotehost, passwd); 1637 } else { 1638 if (dochroot) 1639 reply(230, "User %s logged in, " 1640 "access restrictions apply.", pw->pw_name); 1641 else 1642 reply(230, "User %s logged in.", pw->pw_name); 1643 1644#ifdef SETPROCTITLE 1645 snprintf(proctitle, sizeof(proctitle), 1646 "%s: user/%s", remotehost, pw->pw_name); 1647 setproctitle("%s", proctitle); 1648#endif /* SETPROCTITLE */ 1649 if (logging) 1650 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1651 remotehost, pw->pw_name); 1652 } 1653 if (logging && (guest || dochroot)) 1654 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1655#ifdef LOGIN_CAP 1656 login_close(lc); 1657#endif 1658 if (residue) 1659 free(residue); 1660 return; 1661bad: 1662 /* Forget all about it... */ 1663#ifdef LOGIN_CAP 1664 login_close(lc); 1665#endif 1666 if (residue) 1667 free(residue); 1668 end_login(); 1669} 1670 1671void 1672retrieve(char *cmd, char *name) 1673{ 1674 FILE *fin, *dout; 1675 struct stat st; 1676 int (*closefunc)(FILE *); 1677 time_t start; 1678 1679 if (cmd == 0) { 1680 fin = fopen(name, "r"), closefunc = fclose; 1681 st.st_size = 0; 1682 } else { 1683 char line[BUFSIZ]; 1684 1685 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1686 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1687 st.st_size = -1; 1688 st.st_blksize = BUFSIZ; 1689 } 1690 if (fin == NULL) { 1691 if (errno != 0) { 1692 perror_reply(550, name); 1693 if (cmd == 0) { 1694 LOGCMD("get", name); 1695 } 1696 } 1697 return; 1698 } 1699 byte_count = -1; 1700 if (cmd == 0) { 1701 if (fstat(fileno(fin), &st) < 0) { 1702 perror_reply(550, name); 1703 goto done; 1704 } 1705 if (!S_ISREG(st.st_mode)) { 1706 /* 1707 * Never sending a raw directory is a workaround 1708 * for buggy clients that will attempt to RETR 1709 * a directory before listing it, e.g., Mozilla. 1710 * Preventing a guest from getting irregular files 1711 * is a simple security measure. 1712 */ 1713 if (S_ISDIR(st.st_mode) || guest) { 1714 reply(550, "%s: not a plain file.", name); 1715 goto done; 1716 } 1717 st.st_size = -1; 1718 /* st.st_blksize is set for all descriptor types */ 1719 } 1720 } 1721 if (restart_point) { 1722 if (type == TYPE_A) { 1723 off_t i, n; 1724 int c; 1725 1726 n = restart_point; 1727 i = 0; 1728 while (i++ < n) { 1729 if ((c=getc(fin)) == EOF) { 1730 perror_reply(550, name); 1731 goto done; 1732 } 1733 if (c == '\n') 1734 i++; 1735 } 1736 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1737 perror_reply(550, name); 1738 goto done; 1739 } 1740 } 1741 dout = dataconn(name, st.st_size, "w"); 1742 if (dout == NULL) 1743 goto done; 1744 time(&start); 1745 send_data(fin, dout, st.st_blksize, st.st_size, 1746 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1747 if (cmd == 0 && guest && stats && byte_count > 0) 1748 logxfer(name, byte_count, start); 1749 (void) fclose(dout); 1750 data = -1; 1751 pdata = -1; 1752done: 1753 if (cmd == 0) 1754 LOGBYTES("get", name, byte_count); 1755 (*closefunc)(fin); 1756} 1757 1758void 1759store(char *name, char *mode, int unique) 1760{ 1761 int fd; 1762 FILE *fout, *din; 1763 int (*closefunc)(FILE *); 1764 1765 if (*mode == 'a') { /* APPE */ 1766 if (unique) { 1767 /* Programming error */ 1768 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1769 unique = 0; 1770 } 1771 if (guest && noguestmod) { 1772 reply(550, "Appending to existing file denied."); 1773 goto err; 1774 } 1775 restart_point = 0; /* not affected by preceding REST */ 1776 } 1777 if (unique) /* STOU overrides REST */ 1778 restart_point = 0; 1779 if (guest && noguestmod) { 1780 if (restart_point) { /* guest STOR w/REST */ 1781 reply(550, "Modifying existing file denied."); 1782 goto err; 1783 } else /* treat guest STOR as STOU */ 1784 unique = 1; 1785 } 1786 1787 if (restart_point) 1788 mode = "r+"; /* so ASCII manual seek can work */ 1789 if (unique) { 1790 if ((fd = guniquefd(name, &name)) < 0) 1791 goto err; 1792 fout = fdopen(fd, mode); 1793 } else 1794 fout = fopen(name, mode); 1795 closefunc = fclose; 1796 if (fout == NULL) { 1797 perror_reply(553, name); 1798 goto err; 1799 } 1800 byte_count = -1; 1801 if (restart_point) { 1802 if (type == TYPE_A) { 1803 off_t i, n; 1804 int c; 1805 1806 n = restart_point; 1807 i = 0; 1808 while (i++ < n) { 1809 if ((c=getc(fout)) == EOF) { 1810 perror_reply(550, name); 1811 goto done; 1812 } 1813 if (c == '\n') 1814 i++; 1815 } 1816 /* 1817 * We must do this seek to "current" position 1818 * because we are changing from reading to 1819 * writing. 1820 */ 1821 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1822 perror_reply(550, name); 1823 goto done; 1824 } 1825 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1826 perror_reply(550, name); 1827 goto done; 1828 } 1829 } 1830 din = dataconn(name, -1, "r"); 1831 if (din == NULL) 1832 goto done; 1833 if (receive_data(din, fout) == 0) { 1834 if (unique) 1835 reply(226, "Transfer complete (unique file name:%s).", 1836 name); 1837 else 1838 reply(226, "Transfer complete."); 1839 } 1840 (void) fclose(din); 1841 data = -1; 1842 pdata = -1; 1843done: 1844 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1845 (*closefunc)(fout); 1846 return; 1847err: 1848 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1849 return; 1850} 1851 1852static FILE * 1853getdatasock(char *mode) 1854{ 1855 int on = 1, s, t, tries; 1856 1857 if (data >= 0) 1858 return (fdopen(data, mode)); 1859 1860 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1861 if (s < 0) 1862 goto bad; 1863 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1864 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1865 /* anchor socket to avoid multi-homing problems */ 1866 data_source = ctrl_addr; 1867 data_source.su_port = htons(dataport); 1868 (void) seteuid(0); 1869 for (tries = 1; ; tries++) { 1870 /* 1871 * We should loop here since it's possible that 1872 * another ftpd instance has passed this point and is 1873 * trying to open a data connection in active mode now. 1874 * Until the other connection is opened, we'll be getting 1875 * EADDRINUSE because no SOCK_STREAM sockets in the system 1876 * can share both local and remote addresses, localIP:20 1877 * and *:* in this case. 1878 */ 1879 if (bind(s, (struct sockaddr *)&data_source, 1880 data_source.su_len) >= 0) 1881 break; 1882 if (errno != EADDRINUSE || tries > 10) 1883 goto bad; 1884 sleep(tries); 1885 } 1886 (void) seteuid(pw->pw_uid); 1887#ifdef IP_TOS 1888 if (data_source.su_family == AF_INET) 1889 { 1890 on = IPTOS_THROUGHPUT; 1891 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1892 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1893 } 1894#endif 1895#ifdef TCP_NOPUSH 1896 /* 1897 * Turn off push flag to keep sender TCP from sending short packets 1898 * at the boundaries of each write(). 1899 */ 1900 on = 1; 1901 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1902 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1903#endif 1904 return (fdopen(s, mode)); 1905bad: 1906 /* Return the real value of errno (close may change it) */ 1907 t = errno; 1908 (void) seteuid(pw->pw_uid); 1909 (void) close(s); 1910 errno = t; 1911 return (NULL); 1912} 1913 1914static FILE * 1915dataconn(char *name, off_t size, char *mode) 1916{ 1917 char sizebuf[32]; 1918 FILE *file; 1919 int retry = 0, tos, conerrno; 1920 1921 file_size = size; 1922 byte_count = 0; 1923 if (size != -1) 1924 (void) snprintf(sizebuf, sizeof(sizebuf), 1925 " (%jd bytes)", (intmax_t)size); 1926 else 1927 *sizebuf = '\0'; 1928 if (pdata >= 0) { 1929 union sockunion from; 1930 socklen_t fromlen = ctrl_addr.su_len; 1931 int flags, s; 1932 struct timeval timeout; 1933 fd_set set; 1934 1935 FD_ZERO(&set); 1936 FD_SET(pdata, &set); 1937 1938 timeout.tv_usec = 0; 1939 timeout.tv_sec = 120; 1940 1941 /* 1942 * Granted a socket is in the blocking I/O mode, 1943 * accept() will block after a successful select() 1944 * if the selected connection dies in between. 1945 * Therefore set the non-blocking I/O flag here. 1946 */ 1947 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1948 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1949 goto pdata_err; 1950 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1951 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1952 goto pdata_err; 1953 (void) close(pdata); 1954 pdata = s; 1955 /* 1956 * Unset the inherited non-blocking I/O flag 1957 * on the child socket so stdio can work on it. 1958 */ 1959 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1960 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1961 goto pdata_err; 1962#ifdef IP_TOS 1963 if (from.su_family == AF_INET) 1964 { 1965 tos = IPTOS_THROUGHPUT; 1966 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1967 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1968 } 1969#endif 1970 reply(150, "Opening %s mode data connection for '%s'%s.", 1971 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1972 return (fdopen(pdata, mode)); 1973pdata_err: 1974 reply(425, "Can't open data connection."); 1975 (void) close(pdata); 1976 pdata = -1; 1977 return (NULL); 1978 } 1979 if (data >= 0) { 1980 reply(125, "Using existing data connection for '%s'%s.", 1981 name, sizebuf); 1982 usedefault = 1; 1983 return (fdopen(data, mode)); 1984 } 1985 if (usedefault) 1986 data_dest = his_addr; 1987 usedefault = 1; 1988 do { 1989 file = getdatasock(mode); 1990 if (file == NULL) { 1991 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1992 1993 if (getnameinfo((struct sockaddr *)&data_source, 1994 data_source.su_len, 1995 hostbuf, sizeof(hostbuf) - 1, 1996 portbuf, sizeof(portbuf) - 1, 1997 NI_NUMERICHOST|NI_NUMERICSERV)) 1998 *hostbuf = *portbuf = 0; 1999 hostbuf[sizeof(hostbuf) - 1] = 0; 2000 portbuf[sizeof(portbuf) - 1] = 0; 2001 reply(425, "Can't create data socket (%s,%s): %s.", 2002 hostbuf, portbuf, strerror(errno)); 2003 return (NULL); 2004 } 2005 data = fileno(file); 2006 conerrno = 0; 2007 if (connect(data, (struct sockaddr *)&data_dest, 2008 data_dest.su_len) == 0) 2009 break; 2010 conerrno = errno; 2011 (void) fclose(file); 2012 data = -1; 2013 if (conerrno == EADDRINUSE) { 2014 sleep(swaitint); 2015 retry += swaitint; 2016 } else { 2017 break; 2018 } 2019 } while (retry <= swaitmax); 2020 if (conerrno != 0) { 2021 reply(425, "Can't build data connection: %s.", 2022 strerror(conerrno)); 2023 return (NULL); 2024 } 2025 reply(150, "Opening %s mode data connection for '%s'%s.", 2026 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2027 return (file); 2028} 2029 2030/* 2031 * A helper macro to avoid code duplication 2032 * in send_data() and receive_data(). 2033 * 2034 * XXX We have to block SIGURG during putc() because BSD stdio 2035 * is unable to restart interrupted write operations and hence 2036 * the entire buffer contents will be lost as soon as a write() 2037 * call indicates EINTR to stdio. 2038 */ 2039#define FTPD_PUTC(ch, file, label) \ 2040 do { \ 2041 int ret; \ 2042 \ 2043 do { \ 2044 START_UNSAFE; \ 2045 ret = putc((ch), (file)); \ 2046 END_UNSAFE; \ 2047 CHECKOOB(return (-1)) \ 2048 else if (ferror(file)) \ 2049 goto label; \ 2050 clearerr(file); \ 2051 } while (ret == EOF); \ 2052 } while (0) 2053 2054/* 2055 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2056 * encapsulation of the data subject to Mode, Structure, and Type. 2057 * 2058 * NB: Form isn't handled. 2059 */ 2060static int 2061send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2062{ 2063 int c, cp, filefd, netfd; 2064 char *buf; 2065 2066 STARTXFER; 2067 2068 switch (type) { 2069 2070 case TYPE_A: 2071 cp = EOF; 2072 for (;;) { 2073 c = getc(instr); 2074 CHECKOOB(return (-1)) 2075 else if (c == EOF && ferror(instr)) 2076 goto file_err; 2077 if (c == EOF) { 2078 if (ferror(instr)) { /* resume after OOB */ 2079 clearerr(instr); 2080 continue; 2081 } 2082 if (feof(instr)) /* EOF */ 2083 break; 2084 syslog(LOG_ERR, "Internal: impossible condition" 2085 " on file after getc()"); 2086 goto file_err; 2087 } 2088 if (c == '\n' && cp != '\r') { 2089 FTPD_PUTC('\r', outstr, data_err); 2090 byte_count++; 2091 } 2092 FTPD_PUTC(c, outstr, data_err); 2093 byte_count++; 2094 cp = c; 2095 } 2096#ifdef notyet /* BSD stdio isn't ready for that */ 2097 while (fflush(outstr) == EOF) { 2098 CHECKOOB(return (-1)) 2099 else 2100 goto data_err; 2101 clearerr(outstr); 2102 } 2103 ENDXFER; 2104#else 2105 ENDXFER; 2106 if (fflush(outstr) == EOF) 2107 goto data_err; 2108#endif 2109 reply(226, "Transfer complete."); 2110 return (0); 2111 2112 case TYPE_I: 2113 case TYPE_L: 2114 /* 2115 * isreg is only set if we are not doing restart and we 2116 * are sending a regular file 2117 */ 2118 netfd = fileno(outstr); 2119 filefd = fileno(instr); 2120 2121 if (isreg) { 2122 char *msg = "Transfer complete."; 2123 off_t cnt, offset; 2124 int err; 2125 2126 cnt = offset = 0; 2127 2128 while (filesize > 0) { 2129 err = sendfile(filefd, netfd, offset, 0, 2130 NULL, &cnt, 0); 2131 /* 2132 * Calculate byte_count before OOB processing. 2133 * It can be used in myoob() later. 2134 */ 2135 byte_count += cnt; 2136 offset += cnt; 2137 filesize -= cnt; 2138 CHECKOOB(return (-1)) 2139 else if (err == -1) { 2140 if (errno != EINTR && 2141 cnt == 0 && offset == 0) 2142 goto oldway; 2143 goto data_err; 2144 } 2145 if (err == -1) /* resume after OOB */ 2146 continue; 2147 /* 2148 * We hit the EOF prematurely. 2149 * Perhaps the file was externally truncated. 2150 */ 2151 if (cnt == 0) { 2152 msg = "Transfer finished due to " 2153 "premature end of file."; 2154 break; 2155 } 2156 } 2157 ENDXFER; 2158 reply(226, "%s", msg); 2159 return (0); 2160 } 2161 2162oldway: 2163 if ((buf = malloc(blksize)) == NULL) { 2164 ENDXFER; 2165 reply(451, "Ran out of memory."); 2166 return (-1); 2167 } 2168 2169 for (;;) { 2170 int cnt, len; 2171 char *bp; 2172 2173 cnt = read(filefd, buf, blksize); 2174 CHECKOOB(free(buf); return (-1)) 2175 else if (cnt < 0) { 2176 free(buf); 2177 goto file_err; 2178 } 2179 if (cnt < 0) /* resume after OOB */ 2180 continue; 2181 if (cnt == 0) /* EOF */ 2182 break; 2183 for (len = cnt, bp = buf; len > 0;) { 2184 cnt = write(netfd, bp, len); 2185 CHECKOOB(free(buf); return (-1)) 2186 else if (cnt < 0) { 2187 free(buf); 2188 goto data_err; 2189 } 2190 if (cnt <= 0) 2191 continue; 2192 len -= cnt; 2193 bp += cnt; 2194 byte_count += cnt; 2195 } 2196 } 2197 ENDXFER; 2198 free(buf); 2199 reply(226, "Transfer complete."); 2200 return (0); 2201 default: 2202 ENDXFER; 2203 reply(550, "Unimplemented TYPE %d in send_data.", type); 2204 return (-1); 2205 } 2206 2207data_err: 2208 ENDXFER; 2209 perror_reply(426, "Data connection"); 2210 return (-1); 2211 2212file_err: 2213 ENDXFER; 2214 perror_reply(551, "Error on input file"); 2215 return (-1); 2216} 2217 2218/* 2219 * Transfer data from peer to "outstr" using the appropriate encapulation of 2220 * the data subject to Mode, Structure, and Type. 2221 * 2222 * N.B.: Form isn't handled. 2223 */ 2224static int 2225receive_data(FILE *instr, FILE *outstr) 2226{ 2227 int c, cp; 2228 int bare_lfs = 0; 2229 2230 STARTXFER; 2231 2232 switch (type) { 2233 2234 case TYPE_I: 2235 case TYPE_L: 2236 for (;;) { 2237 int cnt, len; 2238 char *bp; 2239 char buf[BUFSIZ]; 2240 2241 cnt = read(fileno(instr), buf, sizeof(buf)); 2242 CHECKOOB(return (-1)) 2243 else if (cnt < 0) 2244 goto data_err; 2245 if (cnt < 0) /* resume after OOB */ 2246 continue; 2247 if (cnt == 0) /* EOF */ 2248 break; 2249 for (len = cnt, bp = buf; len > 0;) { 2250 cnt = write(fileno(outstr), bp, len); 2251 CHECKOOB(return (-1)) 2252 else if (cnt < 0) 2253 goto file_err; 2254 if (cnt <= 0) 2255 continue; 2256 len -= cnt; 2257 bp += cnt; 2258 byte_count += cnt; 2259 } 2260 } 2261 ENDXFER; 2262 return (0); 2263 2264 case TYPE_E: 2265 ENDXFER; 2266 reply(553, "TYPE E not implemented."); 2267 return (-1); 2268 2269 case TYPE_A: 2270 cp = EOF; 2271 for (;;) { 2272 c = getc(instr); 2273 CHECKOOB(return (-1)) 2274 else if (c == EOF && ferror(instr)) 2275 goto data_err; 2276 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2277 clearerr(instr); 2278 continue; 2279 } 2280 2281 if (cp == '\r') { 2282 if (c != '\n') 2283 FTPD_PUTC('\r', outstr, file_err); 2284 } else 2285 if (c == '\n') 2286 bare_lfs++; 2287 if (c == '\r') { 2288 byte_count++; 2289 cp = c; 2290 continue; 2291 } 2292 2293 /* Check for EOF here in order not to lose last \r. */ 2294 if (c == EOF) { 2295 if (feof(instr)) /* EOF */ 2296 break; 2297 syslog(LOG_ERR, "Internal: impossible condition" 2298 " on data stream after getc()"); 2299 goto data_err; 2300 } 2301 2302 byte_count++; 2303 FTPD_PUTC(c, outstr, file_err); 2304 cp = c; 2305 } 2306#ifdef notyet /* BSD stdio isn't ready for that */ 2307 while (fflush(outstr) == EOF) { 2308 CHECKOOB(return (-1)) 2309 else 2310 goto file_err; 2311 clearerr(outstr); 2312 } 2313 ENDXFER; 2314#else 2315 ENDXFER; 2316 if (fflush(outstr) == EOF) 2317 goto file_err; 2318#endif 2319 if (bare_lfs) { 2320 lreply(226, 2321 "WARNING! %d bare linefeeds received in ASCII mode.", 2322 bare_lfs); 2323 (void)printf(" File may not have transferred correctly.\r\n"); 2324 } 2325 return (0); 2326 default: 2327 ENDXFER; 2328 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2329 return (-1); 2330 } 2331 2332data_err: 2333 ENDXFER; 2334 perror_reply(426, "Data connection"); 2335 return (-1); 2336 2337file_err: 2338 ENDXFER; 2339 perror_reply(452, "Error writing to file"); 2340 return (-1); 2341} 2342 2343void 2344statfilecmd(char *filename) 2345{ 2346 FILE *fin; 2347 int atstart; 2348 int c, code; 2349 char line[LINE_MAX]; 2350 struct stat st; 2351 2352 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2353 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2354 fin = ftpd_popen(line, "r"); 2355 if (fin == NULL) { 2356 perror_reply(551, filename); 2357 return; 2358 } 2359 lreply(code, "Status of %s:", filename); 2360 atstart = 1; 2361 while ((c = getc(fin)) != EOF) { 2362 if (c == '\n') { 2363 if (ferror(stdout)){ 2364 perror_reply(421, "Control connection"); 2365 (void) ftpd_pclose(fin); 2366 dologout(1); 2367 /* NOTREACHED */ 2368 } 2369 if (ferror(fin)) { 2370 perror_reply(551, filename); 2371 (void) ftpd_pclose(fin); 2372 return; 2373 } 2374 (void) putc('\r', stdout); 2375 } 2376 /* 2377 * RFC 959 says neutral text should be prepended before 2378 * a leading 3-digit number followed by whitespace, but 2379 * many ftp clients can be confused by any leading digits, 2380 * as a matter of fact. 2381 */ 2382 if (atstart && isdigit(c)) 2383 (void) putc(' ', stdout); 2384 (void) putc(c, stdout); 2385 atstart = (c == '\n'); 2386 } 2387 (void) ftpd_pclose(fin); 2388 reply(code, "End of status."); 2389} 2390 2391void 2392statcmd(void) 2393{ 2394 union sockunion *su; 2395 u_char *a, *p; 2396 char hname[NI_MAXHOST]; 2397 int ispassive; 2398 2399 if (hostinfo) { 2400 lreply(211, "%s FTP server status:", hostname); 2401 printf(" %s\r\n", version); 2402 } else 2403 lreply(211, "FTP server status:"); 2404 printf(" Connected to %s", remotehost); 2405 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2406 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2407 hname[sizeof(hname) - 1] = 0; 2408 if (strcmp(hname, remotehost) != 0) 2409 printf(" (%s)", hname); 2410 } 2411 printf("\r\n"); 2412 if (logged_in) { 2413 if (guest) 2414 printf(" Logged in anonymously\r\n"); 2415 else 2416 printf(" Logged in as %s\r\n", pw->pw_name); 2417 } else if (askpasswd) 2418 printf(" Waiting for password\r\n"); 2419 else 2420 printf(" Waiting for user name\r\n"); 2421 printf(" TYPE: %s", typenames[type]); 2422 if (type == TYPE_A || type == TYPE_E) 2423 printf(", FORM: %s", formnames[form]); 2424 if (type == TYPE_L) 2425#if CHAR_BIT == 8 2426 printf(" %d", CHAR_BIT); 2427#else 2428 printf(" %d", bytesize); /* need definition! */ 2429#endif 2430 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2431 strunames[stru], modenames[mode]); 2432 if (data != -1) 2433 printf(" Data connection open\r\n"); 2434 else if (pdata != -1) { 2435 ispassive = 1; 2436 su = &pasv_addr; 2437 goto printaddr; 2438 } else if (usedefault == 0) { 2439 ispassive = 0; 2440 su = &data_dest; 2441printaddr: 2442#define UC(b) (((int) b) & 0xff) 2443 if (epsvall) { 2444 printf(" EPSV only mode (EPSV ALL)\r\n"); 2445 goto epsvonly; 2446 } 2447 2448 /* PORT/PASV */ 2449 if (su->su_family == AF_INET) { 2450 a = (u_char *) &su->su_sin.sin_addr; 2451 p = (u_char *) &su->su_sin.sin_port; 2452 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2453 ispassive ? "PASV" : "PORT", 2454 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2455 UC(p[0]), UC(p[1])); 2456 } 2457 2458 /* LPRT/LPSV */ 2459 { 2460 int alen, af, i; 2461 2462 switch (su->su_family) { 2463 case AF_INET: 2464 a = (u_char *) &su->su_sin.sin_addr; 2465 p = (u_char *) &su->su_sin.sin_port; 2466 alen = sizeof(su->su_sin.sin_addr); 2467 af = 4; 2468 break; 2469 case AF_INET6: 2470 a = (u_char *) &su->su_sin6.sin6_addr; 2471 p = (u_char *) &su->su_sin6.sin6_port; 2472 alen = sizeof(su->su_sin6.sin6_addr); 2473 af = 6; 2474 break; 2475 default: 2476 af = 0; 2477 break; 2478 } 2479 if (af) { 2480 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2481 af, alen); 2482 for (i = 0; i < alen; i++) 2483 printf("%d,", UC(a[i])); 2484 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2485 } 2486 } 2487 2488epsvonly:; 2489 /* EPRT/EPSV */ 2490 { 2491 int af; 2492 2493 switch (su->su_family) { 2494 case AF_INET: 2495 af = 1; 2496 break; 2497 case AF_INET6: 2498 af = 2; 2499 break; 2500 default: 2501 af = 0; 2502 break; 2503 } 2504 if (af) { 2505 union sockunion tmp; 2506 2507 tmp = *su; 2508 if (tmp.su_family == AF_INET6) 2509 tmp.su_sin6.sin6_scope_id = 0; 2510 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2511 hname, sizeof(hname) - 1, NULL, 0, 2512 NI_NUMERICHOST)) { 2513 hname[sizeof(hname) - 1] = 0; 2514 printf(" %s |%d|%s|%d|\r\n", 2515 ispassive ? "EPSV" : "EPRT", 2516 af, hname, htons(tmp.su_port)); 2517 } 2518 } 2519 } 2520#undef UC 2521 } else 2522 printf(" No data connection\r\n"); 2523 reply(211, "End of status."); 2524} 2525 2526void 2527fatalerror(char *s) 2528{ 2529 2530 reply(451, "Error in server: %s", s); 2531 reply(221, "Closing connection due to server error."); 2532 dologout(0); 2533 /* NOTREACHED */ 2534} 2535 2536void 2537reply(int n, const char *fmt, ...) 2538{ 2539 va_list ap; 2540 2541 (void)printf("%d ", n); 2542 va_start(ap, fmt); 2543 (void)vprintf(fmt, ap); 2544 va_end(ap); 2545 (void)printf("\r\n"); 2546 (void)fflush(stdout); 2547 if (ftpdebug) { 2548 syslog(LOG_DEBUG, "<--- %d ", n); 2549 va_start(ap, fmt); 2550 vsyslog(LOG_DEBUG, fmt, ap); 2551 va_end(ap); 2552 } 2553} 2554 2555void 2556lreply(int n, const char *fmt, ...) 2557{ 2558 va_list ap; 2559 2560 (void)printf("%d- ", n); 2561 va_start(ap, fmt); 2562 (void)vprintf(fmt, ap); 2563 va_end(ap); 2564 (void)printf("\r\n"); 2565 (void)fflush(stdout); 2566 if (ftpdebug) { 2567 syslog(LOG_DEBUG, "<--- %d- ", n); 2568 va_start(ap, fmt); 2569 vsyslog(LOG_DEBUG, fmt, ap); 2570 va_end(ap); 2571 } 2572} 2573 2574static void 2575ack(char *s) 2576{ 2577 2578 reply(250, "%s command successful.", s); 2579} 2580 2581void 2582nack(char *s) 2583{ 2584 2585 reply(502, "%s command not implemented.", s); 2586} 2587 2588/* ARGSUSED */ 2589void 2590yyerror(char *s) 2591{ 2592 char *cp; 2593 2594 if ((cp = strchr(cbuf,'\n'))) 2595 *cp = '\0'; 2596 reply(500, "%s: command not understood.", cbuf); 2597} 2598 2599void 2600delete(char *name) 2601{ 2602 struct stat st; 2603 2604 LOGCMD("delete", name); 2605 if (lstat(name, &st) < 0) { 2606 perror_reply(550, name); 2607 return; 2608 } 2609 if (S_ISDIR(st.st_mode)) { 2610 if (rmdir(name) < 0) { 2611 perror_reply(550, name); 2612 return; 2613 } 2614 goto done; 2615 } 2616 if (guest && noguestmod) { 2617 reply(550, "Operation not permitted."); 2618 return; 2619 } 2620 if (unlink(name) < 0) { 2621 perror_reply(550, name); 2622 return; 2623 } 2624done: 2625 ack("DELE"); 2626} 2627 2628void 2629cwd(char *path) 2630{ 2631 2632 if (chdir(path) < 0) 2633 perror_reply(550, path); 2634 else 2635 ack("CWD"); 2636} 2637 2638void 2639makedir(char *name) 2640{ 2641 char *s; 2642 2643 LOGCMD("mkdir", name); 2644 if (guest && noguestmkd) 2645 reply(550, "Operation not permitted."); 2646 else if (mkdir(name, 0777) < 0) 2647 perror_reply(550, name); 2648 else { 2649 if ((s = doublequote(name)) == NULL) 2650 fatalerror("Ran out of memory."); 2651 reply(257, "\"%s\" directory created.", s); 2652 free(s); 2653 } 2654} 2655 2656void 2657removedir(char *name) 2658{ 2659 2660 LOGCMD("rmdir", name); 2661 if (rmdir(name) < 0) 2662 perror_reply(550, name); 2663 else 2664 ack("RMD"); 2665} 2666 2667void 2668pwd(void) 2669{ 2670 char *s, path[MAXPATHLEN + 1]; 2671 2672 if (getcwd(path, sizeof(path)) == NULL) 2673 perror_reply(550, "Get current directory"); 2674 else { 2675 if ((s = doublequote(path)) == NULL) 2676 fatalerror("Ran out of memory."); 2677 reply(257, "\"%s\" is current directory.", s); 2678 free(s); 2679 } 2680} 2681 2682char * 2683renamefrom(char *name) 2684{ 2685 struct stat st; 2686 2687 if (guest && noguestmod) { 2688 reply(550, "Operation not permitted."); 2689 return (NULL); 2690 } 2691 if (lstat(name, &st) < 0) { 2692 perror_reply(550, name); 2693 return (NULL); 2694 } 2695 reply(350, "File exists, ready for destination name."); 2696 return (name); 2697} 2698 2699void 2700renamecmd(char *from, char *to) 2701{ 2702 struct stat st; 2703 2704 LOGCMD2("rename", from, to); 2705 2706 if (guest && (stat(to, &st) == 0)) { 2707 reply(550, "%s: permission denied.", to); 2708 return; 2709 } 2710 2711 if (rename(from, to) < 0) 2712 perror_reply(550, "rename"); 2713 else 2714 ack("RNTO"); 2715} 2716 2717static void 2718dolog(struct sockaddr *who) 2719{ 2720 char who_name[NI_MAXHOST]; 2721 2722 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2723 remotehost[sizeof(remotehost) - 1] = 0; 2724 if (getnameinfo(who, who->sa_len, 2725 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2726 *who_name = 0; 2727 who_name[sizeof(who_name) - 1] = 0; 2728 2729#ifdef SETPROCTITLE 2730#ifdef VIRTUAL_HOSTING 2731 if (thishost != firsthost) 2732 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2733 remotehost, hostname); 2734 else 2735#endif 2736 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2737 remotehost); 2738 setproctitle("%s", proctitle); 2739#endif /* SETPROCTITLE */ 2740 2741 if (logging) { 2742#ifdef VIRTUAL_HOSTING 2743 if (thishost != firsthost) 2744 syslog(LOG_INFO, "connection from %s (%s) to %s", 2745 remotehost, who_name, hostname); 2746 else 2747#endif 2748 syslog(LOG_INFO, "connection from %s (%s)", 2749 remotehost, who_name); 2750 } 2751} 2752 2753/* 2754 * Record logout in wtmp file 2755 * and exit with supplied status. 2756 */ 2757void 2758dologout(int status) 2759{ 2760 2761 if (logged_in && dowtmp) { 2762 (void) seteuid(0); 2763 ftpd_logwtmp(wtmpid, NULL, NULL); 2764 } 2765 /* beware of flushing buffers after a SIGPIPE */ 2766 _exit(status); 2767} 2768 2769static void 2770sigurg(int signo) 2771{ 2772 2773 recvurg = 1; 2774} 2775 2776static void 2777maskurg(int flag) 2778{ 2779 int oerrno; 2780 sigset_t sset; 2781 2782 if (!transflag) { 2783 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2784 return; 2785 } 2786 oerrno = errno; 2787 sigemptyset(&sset); 2788 sigaddset(&sset, SIGURG); 2789 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2790 errno = oerrno; 2791} 2792 2793static void 2794flagxfer(int flag) 2795{ 2796 2797 if (flag) { 2798 if (transflag) 2799 syslog(LOG_ERR, "Internal: flagxfer(1): " 2800 "transfer already under way"); 2801 transflag = 1; 2802 maskurg(0); 2803 recvurg = 0; 2804 } else { 2805 if (!transflag) 2806 syslog(LOG_ERR, "Internal: flagxfer(0): " 2807 "no active transfer"); 2808 maskurg(1); 2809 transflag = 0; 2810 } 2811} 2812 2813/* 2814 * Returns 0 if OK to resume or -1 if abort requested. 2815 */ 2816static int 2817myoob(void) 2818{ 2819 char *cp; 2820 int ret; 2821 2822 if (!transflag) { 2823 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2824 return (0); 2825 } 2826 cp = tmpline; 2827 ret = getline(cp, 7, stdin); 2828 if (ret == -1) { 2829 reply(221, "You could at least say goodbye."); 2830 dologout(0); 2831 } else if (ret == -2) { 2832 /* Ignore truncated command. */ 2833 return (0); 2834 } 2835 upper(cp); 2836 if (strcmp(cp, "ABOR\r\n") == 0) { 2837 tmpline[0] = '\0'; 2838 reply(426, "Transfer aborted. Data connection closed."); 2839 reply(226, "Abort successful."); 2840 return (-1); 2841 } 2842 if (strcmp(cp, "STAT\r\n") == 0) { 2843 tmpline[0] = '\0'; 2844 if (file_size != -1) 2845 reply(213, "Status: %jd of %jd bytes transferred.", 2846 (intmax_t)byte_count, (intmax_t)file_size); 2847 else 2848 reply(213, "Status: %jd bytes transferred.", 2849 (intmax_t)byte_count); 2850 } 2851 return (0); 2852} 2853 2854/* 2855 * Note: a response of 425 is not mentioned as a possible response to 2856 * the PASV command in RFC959. However, it has been blessed as 2857 * a legitimate response by Jon Postel in a telephone conversation 2858 * with Rick Adams on 25 Jan 89. 2859 */ 2860void 2861passive(void) 2862{ 2863 socklen_t len; 2864 int on; 2865 char *p, *a; 2866 2867 if (pdata >= 0) /* close old port if one set */ 2868 close(pdata); 2869 2870 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2871 if (pdata < 0) { 2872 perror_reply(425, "Can't open passive connection"); 2873 return; 2874 } 2875 on = 1; 2876 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2877 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2878 2879 (void) seteuid(0); 2880 2881#ifdef IP_PORTRANGE 2882 if (ctrl_addr.su_family == AF_INET) { 2883 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2884 : IP_PORTRANGE_DEFAULT; 2885 2886 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2887 &on, sizeof(on)) < 0) 2888 goto pasv_error; 2889 } 2890#endif 2891#ifdef IPV6_PORTRANGE 2892 if (ctrl_addr.su_family == AF_INET6) { 2893 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2894 : IPV6_PORTRANGE_DEFAULT; 2895 2896 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2897 &on, sizeof(on)) < 0) 2898 goto pasv_error; 2899 } 2900#endif 2901 2902 pasv_addr = ctrl_addr; 2903 pasv_addr.su_port = 0; 2904 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2905 goto pasv_error; 2906 2907 (void) seteuid(pw->pw_uid); 2908 2909 len = sizeof(pasv_addr); 2910 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2911 goto pasv_error; 2912 if (listen(pdata, 1) < 0) 2913 goto pasv_error; 2914 if (pasv_addr.su_family == AF_INET) 2915 a = (char *) &pasv_addr.su_sin.sin_addr; 2916 else if (pasv_addr.su_family == AF_INET6 && 2917 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2918 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2919 else 2920 goto pasv_error; 2921 2922 p = (char *) &pasv_addr.su_port; 2923 2924#define UC(b) (((int) b) & 0xff) 2925 2926 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2927 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2928 return; 2929 2930pasv_error: 2931 (void) seteuid(pw->pw_uid); 2932 (void) close(pdata); 2933 pdata = -1; 2934 perror_reply(425, "Can't open passive connection"); 2935 return; 2936} 2937 2938/* 2939 * Long Passive defined in RFC 1639. 2940 * 228 Entering Long Passive Mode 2941 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2942 */ 2943 2944void 2945long_passive(char *cmd, int pf) 2946{ 2947 socklen_t len; 2948 int on; 2949 char *p, *a; 2950 2951 if (pdata >= 0) /* close old port if one set */ 2952 close(pdata); 2953 2954 if (pf != PF_UNSPEC) { 2955 if (ctrl_addr.su_family != pf) { 2956 switch (ctrl_addr.su_family) { 2957 case AF_INET: 2958 pf = 1; 2959 break; 2960 case AF_INET6: 2961 pf = 2; 2962 break; 2963 default: 2964 pf = 0; 2965 break; 2966 } 2967 /* 2968 * XXX 2969 * only EPRT/EPSV ready clients will understand this 2970 */ 2971 if (strcmp(cmd, "EPSV") == 0 && pf) { 2972 reply(522, "Network protocol mismatch, " 2973 "use (%d)", pf); 2974 } else 2975 reply(501, "Network protocol mismatch."); /*XXX*/ 2976 2977 return; 2978 } 2979 } 2980 2981 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2982 if (pdata < 0) { 2983 perror_reply(425, "Can't open passive connection"); 2984 return; 2985 } 2986 on = 1; 2987 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2988 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2989 2990 (void) seteuid(0); 2991 2992 pasv_addr = ctrl_addr; 2993 pasv_addr.su_port = 0; 2994 len = pasv_addr.su_len; 2995 2996#ifdef IP_PORTRANGE 2997 if (ctrl_addr.su_family == AF_INET) { 2998 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2999 : IP_PORTRANGE_DEFAULT; 3000 3001 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 3002 &on, sizeof(on)) < 0) 3003 goto pasv_error; 3004 } 3005#endif 3006#ifdef IPV6_PORTRANGE 3007 if (ctrl_addr.su_family == AF_INET6) { 3008 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 3009 : IPV6_PORTRANGE_DEFAULT; 3010 3011 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 3012 &on, sizeof(on)) < 0) 3013 goto pasv_error; 3014 } 3015#endif 3016 3017 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 3018 goto pasv_error; 3019 3020 (void) seteuid(pw->pw_uid); 3021 3022 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 3023 goto pasv_error; 3024 if (listen(pdata, 1) < 0) 3025 goto pasv_error; 3026 3027#define UC(b) (((int) b) & 0xff) 3028 3029 if (strcmp(cmd, "LPSV") == 0) { 3030 p = (char *)&pasv_addr.su_port; 3031 switch (pasv_addr.su_family) { 3032 case AF_INET: 3033 a = (char *) &pasv_addr.su_sin.sin_addr; 3034 v4_reply: 3035 reply(228, 3036"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3037 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3038 2, UC(p[0]), UC(p[1])); 3039 return; 3040 case AF_INET6: 3041 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3042 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3043 goto v4_reply; 3044 } 3045 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3046 reply(228, 3047"Entering Long Passive Mode " 3048"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3049 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3050 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3051 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3052 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3053 2, UC(p[0]), UC(p[1])); 3054 return; 3055 } 3056 } else if (strcmp(cmd, "EPSV") == 0) { 3057 switch (pasv_addr.su_family) { 3058 case AF_INET: 3059 case AF_INET6: 3060 reply(229, "Entering Extended Passive Mode (|||%d|)", 3061 ntohs(pasv_addr.su_port)); 3062 return; 3063 } 3064 } else { 3065 /* more proper error code? */ 3066 } 3067 3068pasv_error: 3069 (void) seteuid(pw->pw_uid); 3070 (void) close(pdata); 3071 pdata = -1; 3072 perror_reply(425, "Can't open passive connection"); 3073 return; 3074} 3075 3076/* 3077 * Generate unique name for file with basename "local" 3078 * and open the file in order to avoid possible races. 3079 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3080 * Return descriptor to the file, set "name" to its name. 3081 * 3082 * Generates failure reply on error. 3083 */ 3084static int 3085guniquefd(char *local, char **name) 3086{ 3087 static char new[MAXPATHLEN]; 3088 struct stat st; 3089 char *cp; 3090 int count; 3091 int fd; 3092 3093 cp = strrchr(local, '/'); 3094 if (cp) 3095 *cp = '\0'; 3096 if (stat(cp ? local : ".", &st) < 0) { 3097 perror_reply(553, cp ? local : "."); 3098 return (-1); 3099 } 3100 if (cp) { 3101 /* 3102 * Let not overwrite dirname with counter suffix. 3103 * -4 is for /nn\0 3104 * In this extreme case dot won't be put in front of suffix. 3105 */ 3106 if (strlen(local) > sizeof(new) - 4) { 3107 reply(553, "Pathname too long."); 3108 return (-1); 3109 } 3110 *cp = '/'; 3111 } 3112 /* -4 is for the .nn<null> we put on the end below */ 3113 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3114 cp = new + strlen(new); 3115 /* 3116 * Don't generate dotfile unless requested explicitly. 3117 * This covers the case when basename gets truncated off 3118 * by buffer size. 3119 */ 3120 if (cp > new && cp[-1] != '/') 3121 *cp++ = '.'; 3122 for (count = 0; count < 100; count++) { 3123 /* At count 0 try unmodified name */ 3124 if (count) 3125 (void)sprintf(cp, "%d", count); 3126 if ((fd = open(count ? new : local, 3127 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3128 *name = count ? new : local; 3129 return (fd); 3130 } 3131 if (errno != EEXIST) { 3132 perror_reply(553, count ? new : local); 3133 return (-1); 3134 } 3135 } 3136 reply(452, "Unique file name cannot be created."); 3137 return (-1); 3138} 3139 3140/* 3141 * Format and send reply containing system error number. 3142 */ 3143void 3144perror_reply(int code, char *string) 3145{ 3146 3147 reply(code, "%s: %s.", string, strerror(errno)); 3148} 3149 3150static char *onefile[] = { 3151 "", 3152 0 3153}; 3154 3155void 3156send_file_list(char *whichf) 3157{ 3158 struct stat st; 3159 DIR *dirp = NULL; 3160 struct dirent *dir; 3161 FILE *dout = NULL; 3162 char **dirlist, *dirname; 3163 int simple = 0; 3164 int freeglob = 0; 3165 glob_t gl; 3166 3167 if (strpbrk(whichf, "~{[*?") != NULL) { 3168 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3169 3170 memset(&gl, 0, sizeof(gl)); 3171 gl.gl_matchc = MAXGLOBARGS; 3172 flags |= GLOB_LIMIT; 3173 freeglob = 1; 3174 if (glob(whichf, flags, 0, &gl)) { 3175 reply(550, "No matching files found."); 3176 goto out; 3177 } else if (gl.gl_pathc == 0) { 3178 errno = ENOENT; 3179 perror_reply(550, whichf); 3180 goto out; 3181 } 3182 dirlist = gl.gl_pathv; 3183 } else { 3184 onefile[0] = whichf; 3185 dirlist = onefile; 3186 simple = 1; 3187 } 3188 3189 while ((dirname = *dirlist++)) { 3190 if (stat(dirname, &st) < 0) { 3191 /* 3192 * If user typed "ls -l", etc, and the client 3193 * used NLST, do what the user meant. 3194 */ 3195 if (dirname[0] == '-' && *dirlist == NULL && 3196 dout == NULL) 3197 retrieve(_PATH_LS " %s", dirname); 3198 else 3199 perror_reply(550, whichf); 3200 goto out; 3201 } 3202 3203 if (S_ISREG(st.st_mode)) { 3204 if (dout == NULL) { 3205 dout = dataconn("file list", -1, "w"); 3206 if (dout == NULL) 3207 goto out; 3208 STARTXFER; 3209 } 3210 START_UNSAFE; 3211 fprintf(dout, "%s%s\n", dirname, 3212 type == TYPE_A ? "\r" : ""); 3213 END_UNSAFE; 3214 if (ferror(dout)) 3215 goto data_err; 3216 byte_count += strlen(dirname) + 3217 (type == TYPE_A ? 2 : 1); 3218 CHECKOOB(goto abrt); 3219 continue; 3220 } else if (!S_ISDIR(st.st_mode)) 3221 continue; 3222 3223 if ((dirp = opendir(dirname)) == NULL) 3224 continue; 3225 3226 while ((dir = readdir(dirp)) != NULL) { 3227 char nbuf[MAXPATHLEN]; 3228 3229 CHECKOOB(goto abrt); 3230 3231 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3232 continue; 3233 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3234 dir->d_namlen == 2) 3235 continue; 3236 3237 snprintf(nbuf, sizeof(nbuf), 3238 "%s/%s", dirname, dir->d_name); 3239 3240 /* 3241 * We have to do a stat to insure it's 3242 * not a directory or special file. 3243 */ 3244 if (simple || (stat(nbuf, &st) == 0 && 3245 S_ISREG(st.st_mode))) { 3246 if (dout == NULL) { 3247 dout = dataconn("file list", -1, "w"); 3248 if (dout == NULL) 3249 goto out; 3250 STARTXFER; 3251 } 3252 START_UNSAFE; 3253 if (nbuf[0] == '.' && nbuf[1] == '/') 3254 fprintf(dout, "%s%s\n", &nbuf[2], 3255 type == TYPE_A ? "\r" : ""); 3256 else 3257 fprintf(dout, "%s%s\n", nbuf, 3258 type == TYPE_A ? "\r" : ""); 3259 END_UNSAFE; 3260 if (ferror(dout)) 3261 goto data_err; 3262 byte_count += strlen(nbuf) + 3263 (type == TYPE_A ? 2 : 1); 3264 CHECKOOB(goto abrt); 3265 } 3266 } 3267 (void) closedir(dirp); 3268 dirp = NULL; 3269 } 3270 3271 if (dout == NULL) 3272 reply(550, "No files found."); 3273 else if (ferror(dout)) 3274data_err: perror_reply(550, "Data connection"); 3275 else 3276 reply(226, "Transfer complete."); 3277out: 3278 if (dout) { 3279 ENDXFER; 3280abrt: 3281 (void) fclose(dout); 3282 data = -1; 3283 pdata = -1; 3284 } 3285 if (dirp) 3286 (void) closedir(dirp); 3287 if (freeglob) { 3288 freeglob = 0; 3289 globfree(&gl); 3290 } 3291} 3292 3293void 3294reapchild(int signo) 3295{ 3296 while (waitpid(-1, NULL, WNOHANG) > 0); 3297} 3298 3299#ifdef OLD_SETPROCTITLE 3300/* 3301 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3302 * Warning, since this is usually started from inetd.conf, it often doesn't 3303 * have much of an environment or arglist to overwrite. 3304 */ 3305void 3306setproctitle(const char *fmt, ...) 3307{ 3308 int i; 3309 va_list ap; 3310 char *p, *bp, ch; 3311 char buf[LINE_MAX]; 3312 3313 va_start(ap, fmt); 3314 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3315 3316 /* make ps print our process name */ 3317 p = Argv[0]; 3318 *p++ = '-'; 3319 3320 i = strlen(buf); 3321 if (i > LastArgv - p - 2) { 3322 i = LastArgv - p - 2; 3323 buf[i] = '\0'; 3324 } 3325 bp = buf; 3326 while (ch = *bp++) 3327 if (ch != '\n' && ch != '\r') 3328 *p++ = ch; 3329 while (p < LastArgv) 3330 *p++ = ' '; 3331} 3332#endif /* OLD_SETPROCTITLE */ 3333 3334static void 3335appendf(char **strp, char *fmt, ...) 3336{ 3337 va_list ap; 3338 char *ostr, *p; 3339 3340 va_start(ap, fmt); 3341 vasprintf(&p, fmt, ap); 3342 va_end(ap); 3343 if (p == NULL) 3344 fatalerror("Ran out of memory."); 3345 if (*strp == NULL) 3346 *strp = p; 3347 else { 3348 ostr = *strp; 3349 asprintf(strp, "%s%s", ostr, p); 3350 if (*strp == NULL) 3351 fatalerror("Ran out of memory."); 3352 free(ostr); 3353 } 3354} 3355 3356static void 3357logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3358{ 3359 char *msg = NULL; 3360 char wd[MAXPATHLEN + 1]; 3361 3362 if (logging <= 1) 3363 return; 3364 3365 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3366 strcpy(wd, strerror(errno)); 3367 3368 appendf(&msg, "%s", cmd); 3369 if (file1) 3370 appendf(&msg, " %s", file1); 3371 if (file2) 3372 appendf(&msg, " %s", file2); 3373 if (cnt >= 0) 3374 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3375 appendf(&msg, " (wd: %s", wd); 3376 if (guest || dochroot) 3377 appendf(&msg, "; chrooted"); 3378 appendf(&msg, ")"); 3379 syslog(LOG_INFO, "%s", msg); 3380 free(msg); 3381} 3382 3383static void 3384logxfer(char *name, off_t size, time_t start) 3385{ 3386 char buf[MAXPATHLEN + 1024]; 3387 char path[MAXPATHLEN + 1]; 3388 time_t now; 3389 3390 if (statfd >= 0) { 3391 time(&now); 3392 if (realpath(name, path) == NULL) { 3393 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3394 return; 3395 } 3396 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3397 ctime(&now)+4, ident, remotehost, 3398 path, (intmax_t)size, 3399 (long)(now - start + (now == start))); 3400 write(statfd, buf, strlen(buf)); 3401 } 3402} 3403 3404static char * 3405doublequote(char *s) 3406{ 3407 int n; 3408 char *p, *s2; 3409 3410 for (p = s, n = 0; *p; p++) 3411 if (*p == '"') 3412 n++; 3413 3414 if ((s2 = malloc(p - s + n + 1)) == NULL) 3415 return (NULL); 3416 3417 for (p = s2; *s; s++, p++) { 3418 if ((*p = *s) == '"') 3419 *(++p) = '"'; 3420 } 3421 *p = '\0'; 3422 3423 return (s2); 3424} 3425 3426/* setup server socket for specified address family */ 3427/* if af is PF_UNSPEC more than one socket may be returned */ 3428/* the returned list is dynamically allocated, so caller needs to free it */ 3429static int * 3430socksetup(int af, char *bindname, const char *bindport) 3431{ 3432 struct addrinfo hints, *res, *r; 3433 int error, maxs, *s, *socks; 3434 const int on = 1; 3435 3436 memset(&hints, 0, sizeof(hints)); 3437 hints.ai_flags = AI_PASSIVE; 3438 hints.ai_family = af; 3439 hints.ai_socktype = SOCK_STREAM; 3440 error = getaddrinfo(bindname, bindport, &hints, &res); 3441 if (error) { 3442 syslog(LOG_ERR, "%s", gai_strerror(error)); 3443 if (error == EAI_SYSTEM) 3444 syslog(LOG_ERR, "%s", strerror(errno)); 3445 return NULL; 3446 } 3447 3448 /* Count max number of sockets we may open */ 3449 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3450 ; 3451 socks = malloc((maxs + 1) * sizeof(int)); 3452 if (!socks) { 3453 freeaddrinfo(res); 3454 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3455 return NULL; 3456 } 3457 3458 *socks = 0; /* num of sockets counter at start of array */ 3459 s = socks + 1; 3460 for (r = res; r; r = r->ai_next) { 3461 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3462 if (*s < 0) { 3463 syslog(LOG_DEBUG, "control socket: %m"); 3464 continue; 3465 } 3466 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3467 &on, sizeof(on)) < 0) 3468 syslog(LOG_WARNING, 3469 "control setsockopt (SO_REUSEADDR): %m"); 3470 if (r->ai_family == AF_INET6) { 3471 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3472 &on, sizeof(on)) < 0) 3473 syslog(LOG_WARNING, 3474 "control setsockopt (IPV6_V6ONLY): %m"); 3475 } 3476 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3477 syslog(LOG_DEBUG, "control bind: %m"); 3478 close(*s); 3479 continue; 3480 } 3481 (*socks)++; 3482 s++; 3483 } 3484 3485 if (res) 3486 freeaddrinfo(res); 3487 3488 if (*socks == 0) { 3489 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3490 free(socks); 3491 return NULL; 3492 } 3493 return(socks); 3494} 3495