ftpd.c revision 137859
1/* 2 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#if 0 35#ifndef lint 36static char copyright[] = 37"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39#endif /* not lint */ 40#endif 41 42#ifndef lint 43#if 0 44static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 45#endif 46#endif /* not lint */ 47 48#include <sys/cdefs.h> 49__FBSDID("$FreeBSD: head/libexec/ftpd/ftpd.c 137859 2004-11-18 13:46:29Z yar $"); 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 108extern off_t restart_point; 109extern char cbuf[]; 110 111union sockunion ctrl_addr; 112union sockunion data_source; 113union sockunion data_dest; 114union sockunion his_addr; 115union sockunion pasv_addr; 116 117int daemon_mode; 118int data; 119int dataport; 120int hostinfo = 1; /* print host-specific info in messages */ 121int logged_in; 122struct passwd *pw; 123char *homedir; 124int ftpdebug; 125int timeout = 900; /* timeout after 15 minutes of inactivity */ 126int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 127int logging; 128int restricted_data_ports = 1; 129int paranoid = 1; /* be extra careful about security */ 130int anon_only = 0; /* Only anonymous ftp allowed */ 131int guest; 132int dochroot; 133int dowtmp = 1; 134int stats; 135int statfd = -1; 136int type; 137int form; 138int stru; /* avoid C keyword */ 139int mode; 140int usedefault = 1; /* for data transfers */ 141int pdata = -1; /* for passive mode */ 142int readonly=0; /* Server is in readonly mode. */ 143int noepsv=0; /* EPSV command is disabled. */ 144int noretr=0; /* RETR command is disabled. */ 145int noguestretr=0; /* RETR command is disabled for anon users. */ 146int noguestmkd=0; /* MKD command is disabled for anon users. */ 147int noguestmod=1; /* anon users may not modify existing files. */ 148 149static volatile sig_atomic_t recvurg; 150sig_atomic_t transflag; 151off_t file_size; 152off_t byte_count; 153#if !defined(CMASK) || CMASK == 0 154#undef CMASK 155#define CMASK 027 156#endif 157int defumask = CMASK; /* default umask value */ 158char tmpline[7]; 159char *hostname; 160int epsvall = 0; 161 162#ifdef VIRTUAL_HOSTING 163char *ftpuser; 164 165static struct ftphost { 166 struct ftphost *next; 167 struct addrinfo *hostinfo; 168 char *hostname; 169 char *anonuser; 170 char *statfile; 171 char *welcome; 172 char *loginmsg; 173} *thishost, *firsthost; 174 175#endif 176char remotehost[MAXHOSTNAMELEN]; 177char *ident = NULL; 178 179static char ttyline[20]; 180char *tty = ttyline; /* for klogin */ 181 182#ifdef USE_PAM 183static int auth_pam(struct passwd**, const char*); 184pam_handle_t *pamh = NULL; 185#endif 186 187static struct opie opiedata; 188static char opieprompt[OPIE_CHALLENGE_MAX+1]; 189static int pwok; 190 191char *pid_file = NULL; 192 193/* 194 * Limit number of pathnames that glob can return. 195 * A limit of 0 indicates the number of pathnames is unlimited. 196 */ 197#define MAXGLOBARGS 16384 198# 199 200/* 201 * Timeout intervals for retrying connections 202 * to hosts that don't accept PORT cmds. This 203 * is a kludge, but given the problems with TCP... 204 */ 205#define SWAITMAX 90 /* wait at most 90 seconds */ 206#define SWAITINT 5 /* interval between retries */ 207 208int swaitmax = SWAITMAX; 209int swaitint = SWAITINT; 210 211#ifdef SETPROCTITLE 212#ifdef OLD_SETPROCTITLE 213char **Argv = NULL; /* pointer to argument vector */ 214char *LastArgv = NULL; /* end of argv */ 215#endif /* OLD_SETPROCTITLE */ 216char proctitle[LINE_MAX]; /* initial part of title */ 217#endif /* SETPROCTITLE */ 218 219#define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 220#define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 221#define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 222 223#ifdef VIRTUAL_HOSTING 224static void inithosts(void); 225static void selecthost(union sockunion *); 226#endif 227static void ack(char *); 228static void sigurg(int); 229static void myoob(void); 230static int checkuser(char *, char *, int, char **); 231static FILE *dataconn(char *, off_t, char *); 232static void dolog(struct sockaddr *); 233static void end_login(void); 234static FILE *getdatasock(char *); 235static int guniquefd(char *, char **); 236static void lostconn(int); 237static void sigquit(int); 238static int receive_data(FILE *, FILE *); 239static int send_data(FILE *, FILE *, size_t, off_t, int); 240static struct passwd * 241 sgetpwnam(char *); 242static char *sgetsave(char *); 243static void reapchild(int); 244static void appendf(char **, char *, ...) __printflike(2, 3); 245static void logcmd(char *, char *, char *, off_t); 246static void logxfer(char *, off_t, time_t); 247static char *doublequote(char *); 248static int *socksetup(int, char *, const char *); 249 250int 251main(int argc, char *argv[], char **envp) 252{ 253 int addrlen, ch, on = 1, tos; 254 char *cp, line[LINE_MAX]; 255 FILE *fd; 256 char *bindname = NULL; 257 const char *bindport = "ftp"; 258 int family = AF_UNSPEC; 259 struct sigaction sa; 260 261 tzset(); /* in case no timezone database in ~ftp */ 262 sigemptyset(&sa.sa_mask); 263 sa.sa_flags = SA_RESTART; 264 265#ifdef OLD_SETPROCTITLE 266 /* 267 * Save start and extent of argv for setproctitle. 268 */ 269 Argv = argv; 270 while (*envp) 271 envp++; 272 LastArgv = envp[-1] + strlen(envp[-1]); 273#endif /* OLD_SETPROCTITLE */ 274 275 276 while ((ch = getopt(argc, argv, 277 "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 278 switch (ch) { 279 case '4': 280 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 281 break; 282 283 case '6': 284 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 285 break; 286 287 case 'a': 288 bindname = optarg; 289 break; 290 291 case 'A': 292 anon_only = 1; 293 break; 294 295 case 'd': 296 ftpdebug++; 297 break; 298 299 case 'D': 300 daemon_mode++; 301 break; 302 303 case 'E': 304 noepsv = 1; 305 break; 306 307 case 'h': 308 hostinfo = 0; 309 break; 310 311 case 'l': 312 logging++; /* > 1 == extra logging */ 313 break; 314 315 case 'm': 316 noguestmod = 0; 317 break; 318 319 case 'M': 320 noguestmkd = 1; 321 break; 322 323 case 'o': 324 noretr = 1; 325 break; 326 327 case 'O': 328 noguestretr = 1; 329 break; 330 331 case 'p': 332 pid_file = optarg; 333 break; 334 335 case 'P': 336 bindport = optarg; 337 break; 338 339 case 'r': 340 readonly = 1; 341 break; 342 343 case 'R': 344 paranoid = 0; 345 break; 346 347 case 'S': 348 stats++; 349 break; 350 351 case 't': 352 timeout = atoi(optarg); 353 if (maxtimeout < timeout) 354 maxtimeout = timeout; 355 break; 356 357 case 'T': 358 maxtimeout = atoi(optarg); 359 if (timeout > maxtimeout) 360 timeout = maxtimeout; 361 break; 362 363 case 'u': 364 { 365 long val = 0; 366 367 val = strtol(optarg, &optarg, 8); 368 if (*optarg != '\0' || val < 0) 369 warnx("bad value for -u"); 370 else 371 defumask = val; 372 break; 373 } 374 case 'U': 375 restricted_data_ports = 0; 376 break; 377 378 case 'v': 379 ftpdebug++; 380 break; 381 382 case 'W': 383 dowtmp = 0; 384 break; 385 386 default: 387 warnx("unknown flag -%c ignored", optopt); 388 break; 389 } 390 } 391 392#ifdef VIRTUAL_HOSTING 393 inithosts(); 394#endif 395 (void) freopen(_PATH_DEVNULL, "w", stderr); 396 397 /* 398 * LOG_NDELAY sets up the logging connection immediately, 399 * necessary for anonymous ftp's that chroot and can't do it later. 400 */ 401 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 402 403 if (daemon_mode) { 404 int *ctl_sock, fd, maxfd = -1, nfds, i; 405 fd_set defreadfds, readfds; 406 pid_t pid; 407 408 /* 409 * Detach from parent. 410 */ 411 if (daemon(1, 1) < 0) { 412 syslog(LOG_ERR, "failed to become a daemon"); 413 exit(1); 414 } 415 sa.sa_handler = reapchild; 416 (void)sigaction(SIGCHLD, &sa, NULL); 417 418 /* 419 * Open a socket, bind it to the FTP port, and start 420 * listening. 421 */ 422 ctl_sock = socksetup(family, bindname, bindport); 423 if (ctl_sock == NULL) 424 exit(1); 425 426 FD_ZERO(&defreadfds); 427 for (i = 1; i <= *ctl_sock; i++) { 428 FD_SET(ctl_sock[i], &defreadfds); 429 if (listen(ctl_sock[i], 32) < 0) { 430 syslog(LOG_ERR, "control listen: %m"); 431 exit(1); 432 } 433 if (maxfd < ctl_sock[i]) 434 maxfd = ctl_sock[i]; 435 } 436 437 /* 438 * Atomically write process ID 439 */ 440 if (pid_file) 441 { 442 int fd; 443 char buf[20]; 444 445 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 446 | O_NONBLOCK | O_EXLOCK, 0644); 447 if (fd < 0) { 448 if (errno == EAGAIN) 449 errx(1, "%s: file locked", pid_file); 450 else 451 err(1, "%s", pid_file); 452 } 453 snprintf(buf, sizeof(buf), 454 "%lu\n", (unsigned long) getpid()); 455 if (write(fd, buf, strlen(buf)) < 0) 456 err(1, "%s: write", pid_file); 457 /* Leave the pid file open and locked */ 458 } 459 /* 460 * Loop forever accepting connection requests and forking off 461 * children to handle them. 462 */ 463 while (1) { 464 FD_COPY(&defreadfds, &readfds); 465 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 466 if (nfds <= 0) { 467 if (nfds < 0 && errno != EINTR) 468 syslog(LOG_WARNING, "select: %m"); 469 continue; 470 } 471 472 pid = -1; 473 for (i = 1; i <= *ctl_sock; i++) 474 if (FD_ISSET(ctl_sock[i], &readfds)) { 475 addrlen = sizeof(his_addr); 476 fd = accept(ctl_sock[i], 477 (struct sockaddr *)&his_addr, 478 &addrlen); 479 if (fd >= 0) { 480 if ((pid = fork()) == 0) { 481 /* child */ 482 (void) dup2(fd, 0); 483 (void) dup2(fd, 1); 484 close(ctl_sock[i]); 485 } else 486 close(fd); 487 } 488 } 489 if (pid == 0) 490 break; 491 } 492 } else { 493 addrlen = sizeof(his_addr); 494 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 495 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 496 exit(1); 497 } 498 } 499 500 sa.sa_handler = SIG_DFL; 501 (void)sigaction(SIGCHLD, &sa, NULL); 502 503 sa.sa_handler = sigurg; 504 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 505 (void)sigaction(SIGURG, &sa, NULL); 506 507 sigfillset(&sa.sa_mask); /* block all signals in handler */ 508 sa.sa_flags = SA_RESTART; 509 sa.sa_handler = sigquit; 510 (void)sigaction(SIGHUP, &sa, NULL); 511 (void)sigaction(SIGINT, &sa, NULL); 512 (void)sigaction(SIGQUIT, &sa, NULL); 513 (void)sigaction(SIGTERM, &sa, NULL); 514 515 sa.sa_handler = lostconn; 516 (void)sigaction(SIGPIPE, &sa, NULL); 517 518 addrlen = sizeof(ctrl_addr); 519 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 520 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 521 exit(1); 522 } 523 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 524#ifdef VIRTUAL_HOSTING 525 /* select our identity from virtual host table */ 526 selecthost(&ctrl_addr); 527#endif 528#ifdef IP_TOS 529 if (ctrl_addr.su_family == AF_INET) 530 { 531 tos = IPTOS_LOWDELAY; 532 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 533 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 534 } 535#endif 536 /* 537 * Disable Nagle on the control channel so that we don't have to wait 538 * for peer's ACK before issuing our next reply. 539 */ 540 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 541 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 542 543 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 544 545 /* set this here so klogin can use it... */ 546 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 547 548 /* Try to handle urgent data inline */ 549#ifdef SO_OOBINLINE 550 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 551 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 552#endif 553 554#ifdef F_SETOWN 555 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 556 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 557#endif 558 dolog((struct sockaddr *)&his_addr); 559 /* 560 * Set up default state 561 */ 562 data = -1; 563 type = TYPE_A; 564 form = FORM_N; 565 stru = STRU_F; 566 mode = MODE_S; 567 tmpline[0] = '\0'; 568 569 /* If logins are disabled, print out the message. */ 570 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 571 while (fgets(line, sizeof(line), fd) != NULL) { 572 if ((cp = strchr(line, '\n')) != NULL) 573 *cp = '\0'; 574 lreply(530, "%s", line); 575 } 576 (void) fflush(stdout); 577 (void) fclose(fd); 578 reply(530, "System not available."); 579 exit(0); 580 } 581#ifdef VIRTUAL_HOSTING 582 fd = fopen(thishost->welcome, "r"); 583#else 584 fd = fopen(_PATH_FTPWELCOME, "r"); 585#endif 586 if (fd != NULL) { 587 while (fgets(line, sizeof(line), fd) != NULL) { 588 if ((cp = strchr(line, '\n')) != NULL) 589 *cp = '\0'; 590 lreply(220, "%s", line); 591 } 592 (void) fflush(stdout); 593 (void) fclose(fd); 594 /* reply(220,) must follow */ 595 } 596#ifndef VIRTUAL_HOSTING 597 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 598 fatalerror("Ran out of memory."); 599 (void) gethostname(hostname, MAXHOSTNAMELEN - 1); 600 hostname[MAXHOSTNAMELEN - 1] = '\0'; 601#endif 602 if (hostinfo) 603 reply(220, "%s FTP server (%s) ready.", hostname, version); 604 else 605 reply(220, "FTP server ready."); 606 for (;;) 607 (void) yyparse(); 608 /* NOTREACHED */ 609} 610 611static void 612lostconn(int signo) 613{ 614 615 if (ftpdebug) 616 syslog(LOG_DEBUG, "lost connection"); 617 dologout(1); 618} 619 620static void 621sigquit(int signo) 622{ 623 624 syslog(LOG_ERR, "got signal %d", signo); 625 dologout(1); 626} 627 628#ifdef VIRTUAL_HOSTING 629/* 630 * read in virtual host tables (if they exist) 631 */ 632 633static void 634inithosts(void) 635{ 636 int insert; 637 size_t len; 638 FILE *fp; 639 char *cp, *mp, *line; 640 char *hostname; 641 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 642 struct ftphost *hrp, *lhrp; 643 struct addrinfo hints, *res, *ai; 644 645 /* 646 * Fill in the default host information 647 */ 648 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 649 fatalerror("Ran out of memory."); 650 if (gethostname(hostname, MAXHOSTNAMELEN) < 0) 651 hostname[0] = '\0'; 652 hostname[MAXHOSTNAMELEN - 1] = '\0'; 653 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 654 fatalerror("Ran out of memory."); 655 hrp->hostname = hostname; 656 hrp->hostinfo = NULL; 657 658 memset(&hints, 0, sizeof(hints)); 659 hints.ai_flags = AI_CANONNAME; 660 hints.ai_family = AF_UNSPEC; 661 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 662 hrp->hostinfo = res; 663 hrp->statfile = _PATH_FTPDSTATFILE; 664 hrp->welcome = _PATH_FTPWELCOME; 665 hrp->loginmsg = _PATH_FTPLOGINMESG; 666 hrp->anonuser = "ftp"; 667 hrp->next = NULL; 668 thishost = firsthost = lhrp = hrp; 669 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 670 int addrsize, gothost; 671 void *addr; 672 struct hostent *hp; 673 674 while ((line = fgetln(fp, &len)) != NULL) { 675 int i, hp_error; 676 677 /* skip comments */ 678 if (line[0] == '#') 679 continue; 680 if (line[len - 1] == '\n') { 681 line[len - 1] = '\0'; 682 mp = NULL; 683 } else { 684 if ((mp = malloc(len + 1)) == NULL) 685 fatalerror("Ran out of memory."); 686 memcpy(mp, line, len); 687 mp[len] = '\0'; 688 line = mp; 689 } 690 cp = strtok(line, " \t"); 691 /* skip empty lines */ 692 if (cp == NULL) 693 goto nextline; 694 vhost = cp; 695 696 /* set defaults */ 697 anonuser = "ftp"; 698 statfile = _PATH_FTPDSTATFILE; 699 welcome = _PATH_FTPWELCOME; 700 loginmsg = _PATH_FTPLOGINMESG; 701 702 /* 703 * Preparse the line so we can use its info 704 * for all the addresses associated with 705 * the virtual host name. 706 * Field 0, the virtual host name, is special: 707 * it's already parsed off and will be strdup'ed 708 * later, after we know its canonical form. 709 */ 710 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 711 if (*cp != '-' && (cp = strdup(cp))) 712 switch (i) { 713 case 1: /* anon user permissions */ 714 anonuser = cp; 715 break; 716 case 2: /* statistics file */ 717 statfile = cp; 718 break; 719 case 3: /* welcome message */ 720 welcome = cp; 721 break; 722 case 4: /* login message */ 723 loginmsg = cp; 724 break; 725 default: /* programming error */ 726 abort(); 727 /* NOTREACHED */ 728 } 729 730 hints.ai_flags = 0; 731 hints.ai_family = AF_UNSPEC; 732 hints.ai_flags = AI_PASSIVE; 733 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 734 goto nextline; 735 for (ai = res; ai != NULL && ai->ai_addr != NULL; 736 ai = ai->ai_next) { 737 738 gothost = 0; 739 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 740 struct addrinfo *hi; 741 742 for (hi = hrp->hostinfo; hi != NULL; 743 hi = hi->ai_next) 744 if (hi->ai_addrlen == ai->ai_addrlen && 745 memcmp(hi->ai_addr, 746 ai->ai_addr, 747 ai->ai_addr->sa_len) == 0) { 748 gothost++; 749 break; 750 } 751 if (gothost) 752 break; 753 } 754 if (hrp == NULL) { 755 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 756 goto nextline; 757 hrp->hostname = NULL; 758 insert = 1; 759 } else { 760 if (hrp->hostinfo && hrp->hostinfo != res) 761 freeaddrinfo(hrp->hostinfo); 762 insert = 0; /* host already in the chain */ 763 } 764 hrp->hostinfo = res; 765 766 /* 767 * determine hostname to use. 768 * force defined name if there is a valid alias 769 * otherwise fallback to primary hostname 770 */ 771 /* XXX: getaddrinfo() can't do alias check */ 772 switch(hrp->hostinfo->ai_family) { 773 case AF_INET: 774 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 775 addrsize = sizeof(struct in_addr); 776 break; 777 case AF_INET6: 778 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 779 addrsize = sizeof(struct in6_addr); 780 break; 781 default: 782 /* should not reach here */ 783 freeaddrinfo(hrp->hostinfo); 784 if (insert) 785 free(hrp); /*not in chain, can free*/ 786 else 787 hrp->hostinfo = NULL; /*mark as blank*/ 788 goto nextline; 789 /* NOTREACHED */ 790 } 791 if ((hp = getipnodebyaddr(addr, addrsize, 792 hrp->hostinfo->ai_family, 793 &hp_error)) != NULL) { 794 if (strcmp(vhost, hp->h_name) != 0) { 795 if (hp->h_aliases == NULL) 796 vhost = hp->h_name; 797 else { 798 i = 0; 799 while (hp->h_aliases[i] && 800 strcmp(vhost, hp->h_aliases[i]) != 0) 801 ++i; 802 if (hp->h_aliases[i] == NULL) 803 vhost = hp->h_name; 804 } 805 } 806 } 807 if (hrp->hostname && 808 strcmp(hrp->hostname, vhost) != 0) { 809 free(hrp->hostname); 810 hrp->hostname = NULL; 811 } 812 if (hrp->hostname == NULL && 813 (hrp->hostname = strdup(vhost)) == NULL) { 814 freeaddrinfo(hrp->hostinfo); 815 hrp->hostinfo = NULL; /* mark as blank */ 816 if (hp) 817 freehostent(hp); 818 goto nextline; 819 } 820 hrp->anonuser = anonuser; 821 hrp->statfile = statfile; 822 hrp->welcome = welcome; 823 hrp->loginmsg = loginmsg; 824 if (insert) { 825 hrp->next = NULL; 826 lhrp->next = hrp; 827 lhrp = hrp; 828 } 829 if (hp) 830 freehostent(hp); 831 } 832nextline: 833 if (mp) 834 free(mp); 835 } 836 (void) fclose(fp); 837 } 838} 839 840static void 841selecthost(union sockunion *su) 842{ 843 struct ftphost *hrp; 844 u_int16_t port; 845#ifdef INET6 846 struct in6_addr *mapped_in6 = NULL; 847#endif 848 struct addrinfo *hi; 849 850#ifdef INET6 851 /* 852 * XXX IPv4 mapped IPv6 addr consideraton, 853 * specified in rfc2373. 854 */ 855 if (su->su_family == AF_INET6 && 856 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 857 mapped_in6 = &su->su_sin6.sin6_addr; 858#endif 859 860 hrp = thishost = firsthost; /* default */ 861 port = su->su_port; 862 su->su_port = 0; 863 while (hrp != NULL) { 864 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 865 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 866 thishost = hrp; 867 break; 868 } 869#ifdef INET6 870 /* XXX IPv4 mapped IPv6 addr consideraton */ 871 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 872 (memcmp(&mapped_in6->s6_addr[12], 873 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 874 sizeof(struct in_addr)) == 0)) { 875 thishost = hrp; 876 break; 877 } 878#endif 879 } 880 hrp = hrp->next; 881 } 882 su->su_port = port; 883 /* setup static variables as appropriate */ 884 hostname = thishost->hostname; 885 ftpuser = thishost->anonuser; 886} 887#endif 888 889/* 890 * Helper function for sgetpwnam(). 891 */ 892static char * 893sgetsave(char *s) 894{ 895 char *new = malloc(strlen(s) + 1); 896 897 if (new == NULL) { 898 reply(421, "Ran out of memory."); 899 dologout(1); 900 /* NOTREACHED */ 901 } 902 (void) strcpy(new, s); 903 return (new); 904} 905 906/* 907 * Save the result of a getpwnam. Used for USER command, since 908 * the data returned must not be clobbered by any other command 909 * (e.g., globbing). 910 * NB: The data returned by sgetpwnam() will remain valid until 911 * the next call to this function. Its difference from getpwnam() 912 * is that sgetpwnam() is known to be called from ftpd code only. 913 */ 914static struct passwd * 915sgetpwnam(char *name) 916{ 917 static struct passwd save; 918 struct passwd *p; 919 920 if ((p = getpwnam(name)) == NULL) 921 return (p); 922 if (save.pw_name) { 923 free(save.pw_name); 924 free(save.pw_passwd); 925 free(save.pw_gecos); 926 free(save.pw_dir); 927 free(save.pw_shell); 928 } 929 save = *p; 930 save.pw_name = sgetsave(p->pw_name); 931 save.pw_passwd = sgetsave(p->pw_passwd); 932 save.pw_gecos = sgetsave(p->pw_gecos); 933 save.pw_dir = sgetsave(p->pw_dir); 934 save.pw_shell = sgetsave(p->pw_shell); 935 return (&save); 936} 937 938static int login_attempts; /* number of failed login attempts */ 939static int askpasswd; /* had user command, ask for passwd */ 940static char curname[MAXLOGNAME]; /* current USER name */ 941 942/* 943 * USER command. 944 * Sets global passwd pointer pw if named account exists and is acceptable; 945 * sets askpasswd if a PASS command is expected. If logged in previously, 946 * need to reset state. If name is "ftp" or "anonymous", the name is not in 947 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 948 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 949 * requesting login privileges. Disallow anyone who does not have a standard 950 * shell as returned by getusershell(). Disallow anyone mentioned in the file 951 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 952 */ 953void 954user(char *name) 955{ 956 char *cp, *shell; 957 958 if (logged_in) { 959 if (guest) { 960 reply(530, "Can't change user from guest login."); 961 return; 962 } else if (dochroot) { 963 reply(530, "Can't change user from chroot user."); 964 return; 965 } 966 end_login(); 967 } 968 969 guest = 0; 970#ifdef VIRTUAL_HOSTING 971 pw = sgetpwnam(thishost->anonuser); 972#else 973 pw = sgetpwnam("ftp"); 974#endif 975 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 976 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 977 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 978 reply(530, "User %s access denied.", name); 979 else if (pw != NULL) { 980 guest = 1; 981 askpasswd = 1; 982 reply(331, 983 "Guest login ok, send your email address as password."); 984 } else 985 reply(530, "User %s unknown.", name); 986 if (!askpasswd && logging) 987 syslog(LOG_NOTICE, 988 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 989 return; 990 } 991 if (anon_only != 0) { 992 reply(530, "Sorry, only anonymous ftp allowed."); 993 return; 994 } 995 996 if ((pw = sgetpwnam(name))) { 997 if ((shell = pw->pw_shell) == NULL || *shell == 0) 998 shell = _PATH_BSHELL; 999 setusershell(); 1000 while ((cp = getusershell()) != NULL) 1001 if (strcmp(cp, shell) == 0) 1002 break; 1003 endusershell(); 1004 1005 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1006 reply(530, "User %s access denied.", name); 1007 if (logging) 1008 syslog(LOG_NOTICE, 1009 "FTP LOGIN REFUSED FROM %s, %s", 1010 remotehost, name); 1011 pw = NULL; 1012 return; 1013 } 1014 } 1015 if (logging) 1016 strncpy(curname, name, sizeof(curname)-1); 1017 1018 pwok = 0; 1019#ifdef USE_PAM 1020 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1021#endif 1022 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1023 pwok = (pw != NULL) && 1024 opieaccessfile(remotehost) && 1025 opiealways(pw->pw_dir); 1026 reply(331, "Response to %s %s for %s.", 1027 opieprompt, pwok ? "requested" : "required", name); 1028 } else { 1029 pwok = 1; 1030 reply(331, "Password required for %s.", name); 1031 } 1032 askpasswd = 1; 1033 /* 1034 * Delay before reading passwd after first failed 1035 * attempt to slow down passwd-guessing programs. 1036 */ 1037 if (login_attempts) 1038 sleep(login_attempts); 1039} 1040 1041/* 1042 * Check if a user is in the file "fname", 1043 * return a pointer to a malloc'd string with the rest 1044 * of the matching line in "residue" if not NULL. 1045 */ 1046static int 1047checkuser(char *fname, char *name, int pwset, char **residue) 1048{ 1049 FILE *fd; 1050 int found = 0; 1051 size_t len; 1052 char *line, *mp, *p; 1053 1054 if ((fd = fopen(fname, "r")) != NULL) { 1055 while (!found && (line = fgetln(fd, &len)) != NULL) { 1056 /* skip comments */ 1057 if (line[0] == '#') 1058 continue; 1059 if (line[len - 1] == '\n') { 1060 line[len - 1] = '\0'; 1061 mp = NULL; 1062 } else { 1063 if ((mp = malloc(len + 1)) == NULL) 1064 fatalerror("Ran out of memory."); 1065 memcpy(mp, line, len); 1066 mp[len] = '\0'; 1067 line = mp; 1068 } 1069 /* avoid possible leading and trailing whitespace */ 1070 p = strtok(line, " \t"); 1071 /* skip empty lines */ 1072 if (p == NULL) 1073 goto nextline; 1074 /* 1075 * if first chr is '@', check group membership 1076 */ 1077 if (p[0] == '@') { 1078 int i = 0; 1079 struct group *grp; 1080 1081 if (p[1] == '\0') /* single @ matches anyone */ 1082 found = 1; 1083 else { 1084 if ((grp = getgrnam(p+1)) == NULL) 1085 goto nextline; 1086 /* 1087 * Check user's default group 1088 */ 1089 if (pwset && grp->gr_gid == pw->pw_gid) 1090 found = 1; 1091 /* 1092 * Check supplementary groups 1093 */ 1094 while (!found && grp->gr_mem[i]) 1095 found = strcmp(name, 1096 grp->gr_mem[i++]) 1097 == 0; 1098 } 1099 } 1100 /* 1101 * Otherwise, just check for username match 1102 */ 1103 else 1104 found = strcmp(p, name) == 0; 1105 /* 1106 * Save the rest of line to "residue" if matched 1107 */ 1108 if (found && residue) { 1109 if ((p = strtok(NULL, "")) != NULL) 1110 p += strspn(p, " \t"); 1111 if (p && *p) { 1112 if ((*residue = strdup(p)) == NULL) 1113 fatalerror("Ran out of memory."); 1114 } else 1115 *residue = NULL; 1116 } 1117nextline: 1118 if (mp) 1119 free(mp); 1120 } 1121 (void) fclose(fd); 1122 } 1123 return (found); 1124} 1125 1126/* 1127 * Terminate login as previous user, if any, resetting state; 1128 * used when USER command is given or login fails. 1129 */ 1130static void 1131end_login(void) 1132{ 1133#ifdef USE_PAM 1134 int e; 1135#endif 1136 1137 (void) seteuid(0); 1138 if (logged_in && dowtmp) 1139 ftpd_logwtmp(ttyline, "", NULL); 1140 pw = NULL; 1141#ifdef LOGIN_CAP 1142 setusercontext(NULL, getpwuid(0), 0, 1143 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1144 LOGIN_SETMAC); 1145#endif 1146#ifdef USE_PAM 1147 if (pamh) { 1148 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1149 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1150 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1151 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1152 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1153 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1154 pamh = NULL; 1155 } 1156#endif 1157 logged_in = 0; 1158 guest = 0; 1159 dochroot = 0; 1160} 1161 1162#ifdef USE_PAM 1163 1164/* 1165 * the following code is stolen from imap-uw PAM authentication module and 1166 * login.c 1167 */ 1168#define COPY_STRING(s) (s ? strdup(s) : NULL) 1169 1170struct cred_t { 1171 const char *uname; /* user name */ 1172 const char *pass; /* password */ 1173}; 1174typedef struct cred_t cred_t; 1175 1176static int 1177auth_conv(int num_msg, const struct pam_message **msg, 1178 struct pam_response **resp, void *appdata) 1179{ 1180 int i; 1181 cred_t *cred = (cred_t *) appdata; 1182 struct pam_response *reply; 1183 1184 reply = calloc(num_msg, sizeof *reply); 1185 if (reply == NULL) 1186 return PAM_BUF_ERR; 1187 1188 for (i = 0; i < num_msg; i++) { 1189 switch (msg[i]->msg_style) { 1190 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1191 reply[i].resp_retcode = PAM_SUCCESS; 1192 reply[i].resp = COPY_STRING(cred->uname); 1193 /* PAM frees resp. */ 1194 break; 1195 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1196 reply[i].resp_retcode = PAM_SUCCESS; 1197 reply[i].resp = COPY_STRING(cred->pass); 1198 /* PAM frees resp. */ 1199 break; 1200 case PAM_TEXT_INFO: 1201 case PAM_ERROR_MSG: 1202 reply[i].resp_retcode = PAM_SUCCESS; 1203 reply[i].resp = NULL; 1204 break; 1205 default: /* unknown message style */ 1206 free(reply); 1207 return PAM_CONV_ERR; 1208 } 1209 } 1210 1211 *resp = reply; 1212 return PAM_SUCCESS; 1213} 1214 1215/* 1216 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1217 * authenticated, or 1 if not authenticated. If some sort of PAM system 1218 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1219 * function returns -1. This can be used as an indication that we should 1220 * fall back to a different authentication mechanism. 1221 */ 1222static int 1223auth_pam(struct passwd **ppw, const char *pass) 1224{ 1225 const char *tmpl_user; 1226 const void *item; 1227 int rval; 1228 int e; 1229 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1230 struct pam_conv conv = { &auth_conv, &auth_cred }; 1231 1232 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1233 if (e != PAM_SUCCESS) { 1234 /* 1235 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1236 * if context creation has failed in the first place. 1237 */ 1238 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1239 return -1; 1240 } 1241 1242 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1243 if (e != PAM_SUCCESS) { 1244 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1245 pam_strerror(pamh, e)); 1246 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1247 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1248 } 1249 pamh = NULL; 1250 return -1; 1251 } 1252 1253 e = pam_authenticate(pamh, 0); 1254 switch (e) { 1255 case PAM_SUCCESS: 1256 /* 1257 * With PAM we support the concept of a "template" 1258 * user. The user enters a login name which is 1259 * authenticated by PAM, usually via a remote service 1260 * such as RADIUS or TACACS+. If authentication 1261 * succeeds, a different but related "template" name 1262 * is used for setting the credentials, shell, and 1263 * home directory. The name the user enters need only 1264 * exist on the remote authentication server, but the 1265 * template name must be present in the local password 1266 * database. 1267 * 1268 * This is supported by two various mechanisms in the 1269 * individual modules. However, from the application's 1270 * point of view, the template user is always passed 1271 * back as a changed value of the PAM_USER item. 1272 */ 1273 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1274 PAM_SUCCESS) { 1275 tmpl_user = (const char *) item; 1276 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1277 *ppw = getpwnam(tmpl_user); 1278 } else 1279 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1280 pam_strerror(pamh, e)); 1281 rval = 0; 1282 break; 1283 1284 case PAM_AUTH_ERR: 1285 case PAM_USER_UNKNOWN: 1286 case PAM_MAXTRIES: 1287 rval = 1; 1288 break; 1289 1290 default: 1291 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1292 rval = -1; 1293 break; 1294 } 1295 1296 if (rval == 0) { 1297 e = pam_acct_mgmt(pamh, 0); 1298 if (e == PAM_NEW_AUTHTOK_REQD) { 1299 e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); 1300 if (e != PAM_SUCCESS) { 1301 syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); 1302 rval = 1; 1303 } 1304 } else if (e != PAM_SUCCESS) { 1305 rval = 1; 1306 } 1307 } 1308 1309 if (rval != 0) { 1310 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1311 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1312 } 1313 pamh = NULL; 1314 } 1315 return rval; 1316} 1317 1318#endif /* USE_PAM */ 1319 1320void 1321pass(char *passwd) 1322{ 1323 int rval; 1324 FILE *fd; 1325#ifdef LOGIN_CAP 1326 login_cap_t *lc = NULL; 1327#endif 1328#ifdef USE_PAM 1329 int e; 1330#endif 1331 char *chrootdir; 1332 char *residue = NULL; 1333 char *xpasswd; 1334 1335 if (logged_in || askpasswd == 0) { 1336 reply(503, "Login with USER first."); 1337 return; 1338 } 1339 askpasswd = 0; 1340 if (!guest) { /* "ftp" is only account allowed no password */ 1341 if (pw == NULL) { 1342 rval = 1; /* failure below */ 1343 goto skip; 1344 } 1345#ifdef USE_PAM 1346 rval = auth_pam(&pw, passwd); 1347 if (rval >= 0) { 1348 opieunlock(); 1349 goto skip; 1350 } 1351#endif 1352 if (opieverify(&opiedata, passwd) == 0) 1353 xpasswd = pw->pw_passwd; 1354 else if (pwok) { 1355 xpasswd = crypt(passwd, pw->pw_passwd); 1356 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1357 xpasswd = ":"; 1358 } else { 1359 rval = 1; 1360 goto skip; 1361 } 1362 rval = strcmp(pw->pw_passwd, xpasswd); 1363 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1364 rval = 1; /* failure */ 1365skip: 1366 /* 1367 * If rval == 1, the user failed the authentication check 1368 * above. If rval == 0, either PAM or local authentication 1369 * succeeded. 1370 */ 1371 if (rval) { 1372 reply(530, "Login incorrect."); 1373 if (logging) { 1374 syslog(LOG_NOTICE, 1375 "FTP LOGIN FAILED FROM %s", 1376 remotehost); 1377 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1378 "FTP LOGIN FAILED FROM %s, %s", 1379 remotehost, curname); 1380 } 1381 pw = NULL; 1382 if (login_attempts++ >= 5) { 1383 syslog(LOG_NOTICE, 1384 "repeated login failures from %s", 1385 remotehost); 1386 exit(0); 1387 } 1388 return; 1389 } 1390 } 1391 login_attempts = 0; /* this time successful */ 1392 if (setegid(pw->pw_gid) < 0) { 1393 reply(550, "Can't set gid."); 1394 return; 1395 } 1396 /* May be overridden by login.conf */ 1397 (void) umask(defumask); 1398#ifdef LOGIN_CAP 1399 if ((lc = login_getpwclass(pw)) != NULL) { 1400 char remote_ip[MAXHOSTNAMELEN]; 1401 1402 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1403 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1404 NI_NUMERICHOST); 1405 remote_ip[sizeof(remote_ip) - 1] = 0; 1406 if (!auth_hostok(lc, remotehost, remote_ip)) { 1407 syslog(LOG_INFO|LOG_AUTH, 1408 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1409 pw->pw_name); 1410 reply(530, "Permission denied."); 1411 pw = NULL; 1412 return; 1413 } 1414 if (!auth_timeok(lc, time(NULL))) { 1415 reply(530, "Login not available right now."); 1416 pw = NULL; 1417 return; 1418 } 1419 } 1420 setusercontext(lc, pw, 0, 1421 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1422 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1423#else 1424 setlogin(pw->pw_name); 1425 (void) initgroups(pw->pw_name, pw->pw_gid); 1426#endif 1427 1428#ifdef USE_PAM 1429 if (pamh) { 1430 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1431 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1432 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1433 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1434 } 1435 } 1436#endif 1437 1438 /* open wtmp before chroot */ 1439 if (dowtmp) 1440 ftpd_logwtmp(ttyline, pw->pw_name, 1441 (struct sockaddr *)&his_addr); 1442 logged_in = 1; 1443 1444 if (guest && stats && statfd < 0) 1445#ifdef VIRTUAL_HOSTING 1446 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1447#else 1448 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1449#endif 1450 if (statfd < 0) 1451 stats = 0; 1452 1453 dochroot = 1454 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1455#ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1456 || login_getcapbool(lc, "ftp-chroot", 0) 1457#endif 1458 ; 1459 chrootdir = NULL; 1460 /* 1461 * For a chrooted local user, 1462 * a) see whether ftpchroot(5) specifies a chroot directory, 1463 * b) extract the directory pathname from the line, 1464 * c) expand it to the absolute pathname if necessary. 1465 */ 1466 if (dochroot && residue && 1467 (chrootdir = strtok(residue, " \t")) != NULL) { 1468 if (chrootdir[0] != '/') 1469 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1470 else 1471 chrootdir = strdup(chrootdir); /* so it can be freed */ 1472 if (chrootdir == NULL) 1473 fatalerror("Ran out of memory."); 1474 } 1475 if (guest || dochroot) { 1476 /* 1477 * If no chroot directory set yet, use the login directory. 1478 * Copy it so it can be modified while pw->pw_dir stays intact. 1479 */ 1480 if (chrootdir == NULL && 1481 (chrootdir = strdup(pw->pw_dir)) == NULL) 1482 fatalerror("Ran out of memory."); 1483 /* 1484 * Check for the "/chroot/./home" syntax, 1485 * separate the chroot and home directory pathnames. 1486 */ 1487 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1488 *(homedir++) = '\0'; /* wipe '/' */ 1489 homedir++; /* skip '.' */ 1490 /* so chrootdir can be freed later */ 1491 if ((homedir = strdup(homedir)) == NULL) 1492 fatalerror("Ran out of memory."); 1493 } else { 1494 /* 1495 * We MUST do a chdir() after the chroot. Otherwise 1496 * the old current directory will be accessible as "." 1497 * outside the new root! 1498 */ 1499 homedir = "/"; 1500 } 1501 /* 1502 * Finally, do chroot() 1503 */ 1504 if (chroot(chrootdir) < 0) { 1505 reply(550, "Can't change root."); 1506 goto bad; 1507 } 1508 } else /* real user w/o chroot */ 1509 homedir = pw->pw_dir; 1510 /* 1511 * Set euid *before* doing chdir() so 1512 * a) the user won't be carried to a directory that he couldn't reach 1513 * on his own due to no permission to upper path components, 1514 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1515 * (uid 0 has no root power over NFS if not mapped explicitly.) 1516 */ 1517 if (seteuid(pw->pw_uid) < 0) { 1518 reply(550, "Can't set uid."); 1519 goto bad; 1520 } 1521 if (chdir(homedir) < 0) { 1522 if (guest || dochroot) { 1523 reply(550, "Can't change to base directory."); 1524 goto bad; 1525 } else { 1526 if (chdir("/") < 0) { 1527 reply(550, "Root is inaccessible."); 1528 goto bad; 1529 } 1530 lreply(230, "No directory! Logging in with home=/."); 1531 } 1532 } 1533 1534 /* 1535 * Display a login message, if it exists. 1536 * N.B. reply(230,) must follow the message. 1537 */ 1538#ifdef VIRTUAL_HOSTING 1539 fd = fopen(thishost->loginmsg, "r"); 1540#else 1541 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1542#endif 1543 if (fd != NULL) { 1544 char *cp, line[LINE_MAX]; 1545 1546 while (fgets(line, sizeof(line), fd) != NULL) { 1547 if ((cp = strchr(line, '\n')) != NULL) 1548 *cp = '\0'; 1549 lreply(230, "%s", line); 1550 } 1551 (void) fflush(stdout); 1552 (void) fclose(fd); 1553 } 1554 if (guest) { 1555 if (ident != NULL) 1556 free(ident); 1557 ident = strdup(passwd); 1558 if (ident == NULL) 1559 fatalerror("Ran out of memory."); 1560 1561 reply(230, "Guest login ok, access restrictions apply."); 1562#ifdef SETPROCTITLE 1563#ifdef VIRTUAL_HOSTING 1564 if (thishost != firsthost) 1565 snprintf(proctitle, sizeof(proctitle), 1566 "%s: anonymous(%s)/%s", remotehost, hostname, 1567 passwd); 1568 else 1569#endif 1570 snprintf(proctitle, sizeof(proctitle), 1571 "%s: anonymous/%s", remotehost, passwd); 1572 setproctitle("%s", proctitle); 1573#endif /* SETPROCTITLE */ 1574 if (logging) 1575 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1576 remotehost, passwd); 1577 } else { 1578 if (dochroot) 1579 reply(230, "User %s logged in, " 1580 "access restrictions apply.", pw->pw_name); 1581 else 1582 reply(230, "User %s logged in.", pw->pw_name); 1583 1584#ifdef SETPROCTITLE 1585 snprintf(proctitle, sizeof(proctitle), 1586 "%s: user/%s", remotehost, pw->pw_name); 1587 setproctitle("%s", proctitle); 1588#endif /* SETPROCTITLE */ 1589 if (logging) 1590 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1591 remotehost, pw->pw_name); 1592 } 1593#ifdef LOGIN_CAP 1594 login_close(lc); 1595#endif 1596 if (chrootdir) 1597 free(chrootdir); 1598 if (residue) 1599 free(residue); 1600 return; 1601bad: 1602 /* Forget all about it... */ 1603#ifdef LOGIN_CAP 1604 login_close(lc); 1605#endif 1606 if (chrootdir) 1607 free(chrootdir); 1608 if (residue) 1609 free(residue); 1610 end_login(); 1611} 1612 1613void 1614retrieve(char *cmd, char *name) 1615{ 1616 FILE *fin, *dout; 1617 struct stat st; 1618 int (*closefunc)(FILE *); 1619 time_t start; 1620 1621 if (cmd == 0) { 1622 fin = fopen(name, "r"), closefunc = fclose; 1623 st.st_size = 0; 1624 } else { 1625 char line[BUFSIZ]; 1626 1627 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1628 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1629 st.st_size = -1; 1630 st.st_blksize = BUFSIZ; 1631 } 1632 if (fin == NULL) { 1633 if (errno != 0) { 1634 perror_reply(550, name); 1635 if (cmd == 0) { 1636 LOGCMD("get", name); 1637 } 1638 } 1639 return; 1640 } 1641 byte_count = -1; 1642 if (cmd == 0) { 1643 if (fstat(fileno(fin), &st) < 0) { 1644 perror_reply(550, name); 1645 goto done; 1646 } 1647 if (!S_ISREG(st.st_mode)) { 1648 /* 1649 * Never sending a raw directory is a workaround 1650 * for buggy clients that will attempt to RETR 1651 * a directory before listing it, e.g., Mozilla. 1652 * Preventing a guest from getting irregular files 1653 * is a simple security measure. 1654 */ 1655 if (S_ISDIR(st.st_mode) || guest) { 1656 reply(550, "%s: not a plain file.", name); 1657 goto done; 1658 } 1659 st.st_size = -1; 1660 /* st.st_blksize is set for all descriptor types */ 1661 } 1662 } 1663 if (restart_point) { 1664 if (type == TYPE_A) { 1665 off_t i, n; 1666 int c; 1667 1668 n = restart_point; 1669 i = 0; 1670 while (i++ < n) { 1671 if ((c=getc(fin)) == EOF) { 1672 perror_reply(550, name); 1673 goto done; 1674 } 1675 if (c == '\n') 1676 i++; 1677 } 1678 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1679 perror_reply(550, name); 1680 goto done; 1681 } 1682 } 1683 dout = dataconn(name, st.st_size, "w"); 1684 if (dout == NULL) 1685 goto done; 1686 time(&start); 1687 send_data(fin, dout, st.st_blksize, st.st_size, 1688 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1689 if (cmd == 0 && guest && stats && byte_count > 0) 1690 logxfer(name, byte_count, start); 1691 (void) fclose(dout); 1692 data = -1; 1693 pdata = -1; 1694done: 1695 if (cmd == 0) 1696 LOGBYTES("get", name, byte_count); 1697 (*closefunc)(fin); 1698} 1699 1700void 1701store(char *name, char *mode, int unique) 1702{ 1703 int fd; 1704 FILE *fout, *din; 1705 int (*closefunc)(FILE *); 1706 1707 if (*mode == 'a') { /* APPE */ 1708 if (unique) { 1709 /* Programming error */ 1710 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1711 unique = 0; 1712 } 1713 if (guest && noguestmod) { 1714 reply(550, "Appending to existing file denied."); 1715 goto err; 1716 } 1717 restart_point = 0; /* not affected by preceding REST */ 1718 } 1719 if (unique) /* STOU overrides REST */ 1720 restart_point = 0; 1721 if (guest && noguestmod) { 1722 if (restart_point) { /* guest STOR w/REST */ 1723 reply(550, "Modifying existing file denied."); 1724 goto err; 1725 } else /* treat guest STOR as STOU */ 1726 unique = 1; 1727 } 1728 1729 if (restart_point) 1730 mode = "r+"; /* so ASCII manual seek can work */ 1731 if (unique) { 1732 if ((fd = guniquefd(name, &name)) < 0) 1733 goto err; 1734 fout = fdopen(fd, mode); 1735 } else 1736 fout = fopen(name, mode); 1737 closefunc = fclose; 1738 if (fout == NULL) { 1739 perror_reply(553, name); 1740 goto err; 1741 } 1742 byte_count = -1; 1743 if (restart_point) { 1744 if (type == TYPE_A) { 1745 off_t i, n; 1746 int c; 1747 1748 n = restart_point; 1749 i = 0; 1750 while (i++ < n) { 1751 if ((c=getc(fout)) == EOF) { 1752 perror_reply(550, name); 1753 goto done; 1754 } 1755 if (c == '\n') 1756 i++; 1757 } 1758 /* 1759 * We must do this seek to "current" position 1760 * because we are changing from reading to 1761 * writing. 1762 */ 1763 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1764 perror_reply(550, name); 1765 goto done; 1766 } 1767 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1768 perror_reply(550, name); 1769 goto done; 1770 } 1771 } 1772 din = dataconn(name, -1, "r"); 1773 if (din == NULL) 1774 goto done; 1775 if (receive_data(din, fout) == 0) { 1776 if (unique) 1777 reply(226, "Transfer complete (unique file name:%s).", 1778 name); 1779 else 1780 reply(226, "Transfer complete."); 1781 } 1782 (void) fclose(din); 1783 data = -1; 1784 pdata = -1; 1785done: 1786 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1787 (*closefunc)(fout); 1788 return; 1789err: 1790 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1791 return; 1792} 1793 1794static FILE * 1795getdatasock(char *mode) 1796{ 1797 int on = 1, s, t, tries; 1798 1799 if (data >= 0) 1800 return (fdopen(data, mode)); 1801 1802 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1803 if (s < 0) 1804 goto bad; 1805 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1806 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1807 /* anchor socket to avoid multi-homing problems */ 1808 data_source = ctrl_addr; 1809 data_source.su_port = htons(dataport); 1810 (void) seteuid(0); 1811 for (tries = 1; ; tries++) { 1812 /* 1813 * We should loop here since it's possible that 1814 * another ftpd instance has passed this point and is 1815 * trying to open a data connection in active mode now. 1816 * Until the other connection is opened, we'll be getting 1817 * EADDRINUSE because no SOCK_STREAM sockets in the system 1818 * can share both local and remote addresses, localIP:20 1819 * and *:* in this case. 1820 */ 1821 if (bind(s, (struct sockaddr *)&data_source, 1822 data_source.su_len) >= 0) 1823 break; 1824 if (errno != EADDRINUSE || tries > 10) 1825 goto bad; 1826 sleep(tries); 1827 } 1828 (void) seteuid(pw->pw_uid); 1829#ifdef IP_TOS 1830 if (data_source.su_family == AF_INET) 1831 { 1832 on = IPTOS_THROUGHPUT; 1833 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1834 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1835 } 1836#endif 1837#ifdef TCP_NOPUSH 1838 /* 1839 * Turn off push flag to keep sender TCP from sending short packets 1840 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1841 * to set the send buffer size as well, but that may not be desirable 1842 * in heavy-load situations. 1843 */ 1844 on = 1; 1845 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1846 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1847#endif 1848#ifdef SO_SNDBUF 1849 on = 65536; 1850 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1851 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1852#endif 1853 1854 return (fdopen(s, mode)); 1855bad: 1856 /* Return the real value of errno (close may change it) */ 1857 t = errno; 1858 (void) seteuid(pw->pw_uid); 1859 (void) close(s); 1860 errno = t; 1861 return (NULL); 1862} 1863 1864static FILE * 1865dataconn(char *name, off_t size, char *mode) 1866{ 1867 char sizebuf[32]; 1868 FILE *file; 1869 int retry = 0, tos, conerrno; 1870 1871 file_size = size; 1872 byte_count = 0; 1873 if (size != -1) 1874 (void) snprintf(sizebuf, sizeof(sizebuf), 1875 " (%jd bytes)", (intmax_t)size); 1876 else 1877 *sizebuf = '\0'; 1878 if (pdata >= 0) { 1879 union sockunion from; 1880 int flags; 1881 int s, fromlen = ctrl_addr.su_len; 1882 struct timeval timeout; 1883 fd_set set; 1884 1885 FD_ZERO(&set); 1886 FD_SET(pdata, &set); 1887 1888 timeout.tv_usec = 0; 1889 timeout.tv_sec = 120; 1890 1891 /* 1892 * Granted a socket is in the blocking I/O mode, 1893 * accept() will block after a successful select() 1894 * if the selected connection dies in between. 1895 * Therefore set the non-blocking I/O flag here. 1896 */ 1897 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1898 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1899 goto pdata_err; 1900 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1901 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1902 goto pdata_err; 1903 (void) close(pdata); 1904 pdata = s; 1905 /* 1906 * Unset the inherited non-blocking I/O flag 1907 * on the child socket so stdio can work on it. 1908 */ 1909 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1910 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1911 goto pdata_err; 1912#ifdef IP_TOS 1913 if (from.su_family == AF_INET) 1914 { 1915 tos = IPTOS_THROUGHPUT; 1916 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1917 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1918 } 1919#endif 1920 reply(150, "Opening %s mode data connection for '%s'%s.", 1921 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1922 return (fdopen(pdata, mode)); 1923pdata_err: 1924 reply(425, "Can't open data connection."); 1925 (void) close(pdata); 1926 pdata = -1; 1927 return (NULL); 1928 } 1929 if (data >= 0) { 1930 reply(125, "Using existing data connection for '%s'%s.", 1931 name, sizebuf); 1932 usedefault = 1; 1933 return (fdopen(data, mode)); 1934 } 1935 if (usedefault) 1936 data_dest = his_addr; 1937 usedefault = 1; 1938 do { 1939 file = getdatasock(mode); 1940 if (file == NULL) { 1941 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1942 getnameinfo((struct sockaddr *)&data_source, 1943 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1944 portbuf, sizeof(portbuf), 1945 NI_NUMERICHOST|NI_NUMERICSERV); 1946 reply(425, "Can't create data socket (%s,%s): %s.", 1947 hostbuf, portbuf, strerror(errno)); 1948 return (NULL); 1949 } 1950 data = fileno(file); 1951 conerrno = 0; 1952 if (connect(data, (struct sockaddr *)&data_dest, 1953 data_dest.su_len) == 0) 1954 break; 1955 conerrno = errno; 1956 (void) fclose(file); 1957 data = -1; 1958 if (conerrno == EADDRINUSE) { 1959 sleep(swaitint); 1960 retry += swaitint; 1961 } else { 1962 break; 1963 } 1964 } while (retry <= swaitmax); 1965 if (conerrno != 0) { 1966 reply(425, "Can't build data connection: %s.", 1967 strerror(conerrno)); 1968 return (NULL); 1969 } 1970 reply(150, "Opening %s mode data connection for '%s'%s.", 1971 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1972 return (file); 1973} 1974 1975/* 1976 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1977 * encapsulation of the data subject to Mode, Structure, and Type. 1978 * 1979 * NB: Form isn't handled. 1980 */ 1981static int 1982send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 1983{ 1984 int c, cp, filefd, netfd; 1985 char *buf; 1986 off_t cnt; 1987 1988 transflag++; 1989 switch (type) { 1990 1991 case TYPE_A: 1992 cp = '\0'; 1993 while ((c = getc(instr)) != EOF) { 1994 if (recvurg) 1995 goto got_oob; 1996 byte_count++; 1997 if (c == '\n' && cp != '\r') { 1998 if (ferror(outstr)) 1999 goto data_err; 2000 (void) putc('\r', outstr); 2001 } 2002 (void) putc(c, outstr); 2003 cp = c; 2004 } 2005 if (recvurg) 2006 goto got_oob; 2007 fflush(outstr); 2008 transflag = 0; 2009 if (ferror(instr)) 2010 goto file_err; 2011 if (ferror(outstr)) 2012 goto data_err; 2013 reply(226, "Transfer complete."); 2014 return (0); 2015 2016 case TYPE_I: 2017 case TYPE_L: 2018 /* 2019 * isreg is only set if we are not doing restart and we 2020 * are sending a regular file 2021 */ 2022 netfd = fileno(outstr); 2023 filefd = fileno(instr); 2024 2025 if (isreg) { 2026 2027 char *msg = "Transfer complete."; 2028 off_t offset; 2029 int err; 2030 2031 cnt = offset = 0; 2032 2033 while (filesize > 0) { 2034 err = sendfile(filefd, netfd, offset, 0, 2035 NULL, &cnt, 0); 2036 /* 2037 * Calculate byte_count before OOB processing. 2038 * It can be used in myoob() later. 2039 */ 2040 byte_count += cnt; 2041 if (recvurg) 2042 goto got_oob; 2043 offset += cnt; 2044 filesize -= cnt; 2045 2046 if (err == -1) { 2047 if (cnt == 0 && offset == 0) 2048 goto oldway; 2049 2050 goto data_err; 2051 } 2052 2053 /* 2054 * We hit the EOF prematurely. 2055 * Perhaps the file was externally truncated. 2056 */ 2057 if (cnt == 0) { 2058 msg = "Transfer finished due to " 2059 "premature end of file."; 2060 break; 2061 } 2062 } 2063 2064 transflag = 0; 2065 reply(226, msg); 2066 return (0); 2067 } 2068 2069oldway: 2070 if ((buf = malloc(blksize)) == NULL) { 2071 transflag = 0; 2072 reply(451, "Ran out of memory."); 2073 return (-1); 2074 } 2075 2076 while ((cnt = read(filefd, buf, blksize)) > 0 && 2077 write(netfd, buf, cnt) == cnt) 2078 byte_count += cnt; 2079 transflag = 0; 2080 (void)free(buf); 2081 if (cnt != 0) { 2082 if (cnt < 0) 2083 goto file_err; 2084 goto data_err; 2085 } 2086 reply(226, "Transfer complete."); 2087 return (0); 2088 default: 2089 transflag = 0; 2090 reply(550, "Unimplemented TYPE %d in send_data.", type); 2091 return (-1); 2092 } 2093 2094data_err: 2095 transflag = 0; 2096 perror_reply(426, "Data connection"); 2097 return (-1); 2098 2099file_err: 2100 transflag = 0; 2101 perror_reply(551, "Error on input file"); 2102 return (-1); 2103 2104got_oob: 2105 myoob(); 2106 recvurg = 0; 2107 transflag = 0; 2108 return (-1); 2109} 2110 2111/* 2112 * Transfer data from peer to "outstr" using the appropriate encapulation of 2113 * the data subject to Mode, Structure, and Type. 2114 * 2115 * N.B.: Form isn't handled. 2116 */ 2117static int 2118receive_data(FILE *instr, FILE *outstr) 2119{ 2120 int c; 2121 int cnt, bare_lfs; 2122 char buf[BUFSIZ]; 2123 2124 transflag++; 2125 bare_lfs = 0; 2126 2127 switch (type) { 2128 2129 case TYPE_I: 2130 case TYPE_L: 2131 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 2132 if (recvurg) 2133 goto got_oob; 2134 if (write(fileno(outstr), buf, cnt) != cnt) 2135 goto file_err; 2136 byte_count += cnt; 2137 } 2138 if (recvurg) 2139 goto got_oob; 2140 if (cnt < 0) 2141 goto data_err; 2142 transflag = 0; 2143 return (0); 2144 2145 case TYPE_E: 2146 reply(553, "TYPE E not implemented."); 2147 transflag = 0; 2148 return (-1); 2149 2150 case TYPE_A: 2151 while ((c = getc(instr)) != EOF) { 2152 if (recvurg) 2153 goto got_oob; 2154 byte_count++; 2155 if (c == '\n') 2156 bare_lfs++; 2157 while (c == '\r') { 2158 if (ferror(outstr)) 2159 goto data_err; 2160 if ((c = getc(instr)) != '\n') { 2161 (void) putc ('\r', outstr); 2162 if (c == '\0' || c == EOF) 2163 goto contin2; 2164 } 2165 } 2166 (void) putc(c, outstr); 2167 contin2: ; 2168 } 2169 if (recvurg) 2170 goto got_oob; 2171 fflush(outstr); 2172 if (ferror(instr)) 2173 goto data_err; 2174 if (ferror(outstr)) 2175 goto file_err; 2176 transflag = 0; 2177 if (bare_lfs) { 2178 lreply(226, 2179 "WARNING! %d bare linefeeds received in ASCII mode.", 2180 bare_lfs); 2181 (void)printf(" File may not have transferred correctly.\r\n"); 2182 } 2183 return (0); 2184 default: 2185 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2186 transflag = 0; 2187 return (-1); 2188 } 2189 2190data_err: 2191 transflag = 0; 2192 perror_reply(426, "Data connection"); 2193 return (-1); 2194 2195file_err: 2196 transflag = 0; 2197 perror_reply(452, "Error writing to file"); 2198 return (-1); 2199 2200got_oob: 2201 myoob(); 2202 recvurg = 0; 2203 transflag = 0; 2204 return (-1); 2205} 2206 2207void 2208statfilecmd(char *filename) 2209{ 2210 FILE *fin; 2211 int atstart; 2212 int c, code; 2213 char line[LINE_MAX]; 2214 struct stat st; 2215 2216 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2217 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2218 fin = ftpd_popen(line, "r"); 2219 lreply(code, "Status of %s:", filename); 2220 atstart = 1; 2221 while ((c = getc(fin)) != EOF) { 2222 if (c == '\n') { 2223 if (ferror(stdout)){ 2224 perror_reply(421, "Control connection"); 2225 (void) ftpd_pclose(fin); 2226 dologout(1); 2227 /* NOTREACHED */ 2228 } 2229 if (ferror(fin)) { 2230 perror_reply(551, filename); 2231 (void) ftpd_pclose(fin); 2232 return; 2233 } 2234 (void) putc('\r', stdout); 2235 } 2236 /* 2237 * RFC 959 says neutral text should be prepended before 2238 * a leading 3-digit number followed by whitespace, but 2239 * many ftp clients can be confused by any leading digits, 2240 * as a matter of fact. 2241 */ 2242 if (atstart && isdigit(c)) 2243 (void) putc(' ', stdout); 2244 (void) putc(c, stdout); 2245 atstart = (c == '\n'); 2246 } 2247 (void) ftpd_pclose(fin); 2248 reply(code, "End of status."); 2249} 2250 2251void 2252statcmd(void) 2253{ 2254 union sockunion *su; 2255 u_char *a, *p; 2256 char hname[NI_MAXHOST]; 2257 int ispassive; 2258 2259 if (hostinfo) { 2260 lreply(211, "%s FTP server status:", hostname); 2261 printf(" %s\r\n", version); 2262 } else 2263 lreply(211, "FTP server status:"); 2264 printf(" Connected to %s", remotehost); 2265 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2266 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2267 if (strcmp(hname, remotehost) != 0) 2268 printf(" (%s)", hname); 2269 } 2270 printf("\r\n"); 2271 if (logged_in) { 2272 if (guest) 2273 printf(" Logged in anonymously\r\n"); 2274 else 2275 printf(" Logged in as %s\r\n", pw->pw_name); 2276 } else if (askpasswd) 2277 printf(" Waiting for password\r\n"); 2278 else 2279 printf(" Waiting for user name\r\n"); 2280 printf(" TYPE: %s", typenames[type]); 2281 if (type == TYPE_A || type == TYPE_E) 2282 printf(", FORM: %s", formnames[form]); 2283 if (type == TYPE_L) 2284#if CHAR_BIT == 8 2285 printf(" %d", CHAR_BIT); 2286#else 2287 printf(" %d", bytesize); /* need definition! */ 2288#endif 2289 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2290 strunames[stru], modenames[mode]); 2291 if (data != -1) 2292 printf(" Data connection open\r\n"); 2293 else if (pdata != -1) { 2294 ispassive = 1; 2295 su = &pasv_addr; 2296 goto printaddr; 2297 } else if (usedefault == 0) { 2298 ispassive = 0; 2299 su = &data_dest; 2300printaddr: 2301#define UC(b) (((int) b) & 0xff) 2302 if (epsvall) { 2303 printf(" EPSV only mode (EPSV ALL)\r\n"); 2304 goto epsvonly; 2305 } 2306 2307 /* PORT/PASV */ 2308 if (su->su_family == AF_INET) { 2309 a = (u_char *) &su->su_sin.sin_addr; 2310 p = (u_char *) &su->su_sin.sin_port; 2311 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2312 ispassive ? "PASV" : "PORT", 2313 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2314 UC(p[0]), UC(p[1])); 2315 } 2316 2317 /* LPRT/LPSV */ 2318 { 2319 int alen, af, i; 2320 2321 switch (su->su_family) { 2322 case AF_INET: 2323 a = (u_char *) &su->su_sin.sin_addr; 2324 p = (u_char *) &su->su_sin.sin_port; 2325 alen = sizeof(su->su_sin.sin_addr); 2326 af = 4; 2327 break; 2328 case AF_INET6: 2329 a = (u_char *) &su->su_sin6.sin6_addr; 2330 p = (u_char *) &su->su_sin6.sin6_port; 2331 alen = sizeof(su->su_sin6.sin6_addr); 2332 af = 6; 2333 break; 2334 default: 2335 af = 0; 2336 break; 2337 } 2338 if (af) { 2339 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2340 af, alen); 2341 for (i = 0; i < alen; i++) 2342 printf("%d,", UC(a[i])); 2343 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2344 } 2345 } 2346 2347epsvonly:; 2348 /* EPRT/EPSV */ 2349 { 2350 int af; 2351 2352 switch (su->su_family) { 2353 case AF_INET: 2354 af = 1; 2355 break; 2356 case AF_INET6: 2357 af = 2; 2358 break; 2359 default: 2360 af = 0; 2361 break; 2362 } 2363 if (af) { 2364 union sockunion tmp; 2365 2366 tmp = *su; 2367 if (tmp.su_family == AF_INET6) 2368 tmp.su_sin6.sin6_scope_id = 0; 2369 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2370 hname, sizeof(hname) - 1, NULL, 0, 2371 NI_NUMERICHOST)) { 2372 printf(" %s |%d|%s|%d|\r\n", 2373 ispassive ? "EPSV" : "EPRT", 2374 af, hname, htons(tmp.su_port)); 2375 } 2376 } 2377 } 2378#undef UC 2379 } else 2380 printf(" No data connection\r\n"); 2381 reply(211, "End of status."); 2382} 2383 2384void 2385fatalerror(char *s) 2386{ 2387 2388 reply(451, "Error in server: %s", s); 2389 reply(221, "Closing connection due to server error."); 2390 dologout(0); 2391 /* NOTREACHED */ 2392} 2393 2394void 2395reply(int n, const char *fmt, ...) 2396{ 2397 va_list ap; 2398 2399 (void)printf("%d ", n); 2400 va_start(ap, fmt); 2401 (void)vprintf(fmt, ap); 2402 va_end(ap); 2403 (void)printf("\r\n"); 2404 (void)fflush(stdout); 2405 if (ftpdebug) { 2406 syslog(LOG_DEBUG, "<--- %d ", n); 2407 va_start(ap, fmt); 2408 vsyslog(LOG_DEBUG, fmt, ap); 2409 va_end(ap); 2410 } 2411} 2412 2413void 2414lreply(int n, const char *fmt, ...) 2415{ 2416 va_list ap; 2417 2418 (void)printf("%d- ", n); 2419 va_start(ap, fmt); 2420 (void)vprintf(fmt, ap); 2421 va_end(ap); 2422 (void)printf("\r\n"); 2423 (void)fflush(stdout); 2424 if (ftpdebug) { 2425 syslog(LOG_DEBUG, "<--- %d- ", n); 2426 va_start(ap, fmt); 2427 vsyslog(LOG_DEBUG, fmt, ap); 2428 va_end(ap); 2429 } 2430} 2431 2432static void 2433ack(char *s) 2434{ 2435 2436 reply(250, "%s command successful.", s); 2437} 2438 2439void 2440nack(char *s) 2441{ 2442 2443 reply(502, "%s command not implemented.", s); 2444} 2445 2446/* ARGSUSED */ 2447void 2448yyerror(char *s) 2449{ 2450 char *cp; 2451 2452 if ((cp = strchr(cbuf,'\n'))) 2453 *cp = '\0'; 2454 reply(500, "%s: command not understood.", cbuf); 2455} 2456 2457void 2458delete(char *name) 2459{ 2460 struct stat st; 2461 2462 LOGCMD("delete", name); 2463 if (lstat(name, &st) < 0) { 2464 perror_reply(550, name); 2465 return; 2466 } 2467 if (S_ISDIR(st.st_mode)) { 2468 if (rmdir(name) < 0) { 2469 perror_reply(550, name); 2470 return; 2471 } 2472 goto done; 2473 } 2474 if (guest && noguestmod) { 2475 reply(550, "Operation not permitted."); 2476 return; 2477 } 2478 if (unlink(name) < 0) { 2479 perror_reply(550, name); 2480 return; 2481 } 2482done: 2483 ack("DELE"); 2484} 2485 2486void 2487cwd(char *path) 2488{ 2489 2490 if (chdir(path) < 0) 2491 perror_reply(550, path); 2492 else 2493 ack("CWD"); 2494} 2495 2496void 2497makedir(char *name) 2498{ 2499 char *s; 2500 2501 LOGCMD("mkdir", name); 2502 if (guest && noguestmkd) 2503 reply(550, "Operation not permitted."); 2504 else if (mkdir(name, 0777) < 0) 2505 perror_reply(550, name); 2506 else { 2507 if ((s = doublequote(name)) == NULL) 2508 fatalerror("Ran out of memory."); 2509 reply(257, "\"%s\" directory created.", s); 2510 free(s); 2511 } 2512} 2513 2514void 2515removedir(char *name) 2516{ 2517 2518 LOGCMD("rmdir", name); 2519 if (rmdir(name) < 0) 2520 perror_reply(550, name); 2521 else 2522 ack("RMD"); 2523} 2524 2525void 2526pwd(void) 2527{ 2528 char *s, path[MAXPATHLEN + 1]; 2529 2530 if (getcwd(path, sizeof(path)) == NULL) 2531 perror_reply(550, "Get current directory"); 2532 else { 2533 if ((s = doublequote(path)) == NULL) 2534 fatalerror("Ran out of memory."); 2535 reply(257, "\"%s\" is current directory.", s); 2536 free(s); 2537 } 2538} 2539 2540char * 2541renamefrom(char *name) 2542{ 2543 struct stat st; 2544 2545 if (guest && noguestmod) { 2546 reply(550, "Operation not permitted."); 2547 return (NULL); 2548 } 2549 if (lstat(name, &st) < 0) { 2550 perror_reply(550, name); 2551 return (NULL); 2552 } 2553 reply(350, "File exists, ready for destination name."); 2554 return (name); 2555} 2556 2557void 2558renamecmd(char *from, char *to) 2559{ 2560 struct stat st; 2561 2562 LOGCMD2("rename", from, to); 2563 2564 if (guest && (stat(to, &st) == 0)) { 2565 reply(550, "%s: permission denied.", to); 2566 return; 2567 } 2568 2569 if (rename(from, to) < 0) 2570 perror_reply(550, "rename"); 2571 else 2572 ack("RNTO"); 2573} 2574 2575static void 2576dolog(struct sockaddr *who) 2577{ 2578 int error; 2579 2580 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2581 2582#ifdef SETPROCTITLE 2583#ifdef VIRTUAL_HOSTING 2584 if (thishost != firsthost) 2585 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2586 remotehost, hostname); 2587 else 2588#endif 2589 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2590 remotehost); 2591 setproctitle("%s", proctitle); 2592#endif /* SETPROCTITLE */ 2593 2594 if (logging) { 2595#ifdef VIRTUAL_HOSTING 2596 if (thishost != firsthost) 2597 syslog(LOG_INFO, "connection from %s (to %s)", 2598 remotehost, hostname); 2599 else 2600#endif 2601 { 2602 char who_name[MAXHOSTNAMELEN]; 2603 2604 error = getnameinfo(who, who->sa_len, 2605 who_name, sizeof(who_name) - 1, 2606 NULL, 0, NI_NUMERICHOST); 2607 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2608 error == 0 ? who_name : ""); 2609 } 2610 } 2611} 2612 2613/* 2614 * Record logout in wtmp file 2615 * and exit with supplied status. 2616 */ 2617void 2618dologout(int status) 2619{ 2620 /* 2621 * Prevent reception of SIGURG from resulting in a resumption 2622 * back to the main program loop. 2623 */ 2624 transflag = 0; 2625 2626 if (logged_in && dowtmp) { 2627 (void) seteuid(0); 2628 ftpd_logwtmp(ttyline, "", NULL); 2629 } 2630 /* beware of flushing buffers after a SIGPIPE */ 2631 _exit(status); 2632} 2633 2634static void 2635sigurg(int signo) 2636{ 2637 2638 recvurg = 1; 2639} 2640 2641static void 2642myoob(void) 2643{ 2644 char *cp; 2645 2646 /* only process if transfer occurring */ 2647 if (!transflag) 2648 return; 2649 cp = tmpline; 2650 if (getline(cp, 7, stdin) == NULL) { 2651 reply(221, "You could at least say goodbye."); 2652 dologout(0); 2653 } 2654 upper(cp); 2655 if (strcmp(cp, "ABOR\r\n") == 0) { 2656 tmpline[0] = '\0'; 2657 reply(426, "Transfer aborted. Data connection closed."); 2658 reply(226, "Abort successful."); 2659 } 2660 if (strcmp(cp, "STAT\r\n") == 0) { 2661 tmpline[0] = '\0'; 2662 if (file_size != -1) 2663 reply(213, "Status: %jd of %jd bytes transferred.", 2664 (intmax_t)byte_count, (intmax_t)file_size); 2665 else 2666 reply(213, "Status: %jd bytes transferred.", 2667 (intmax_t)byte_count); 2668 } 2669} 2670 2671/* 2672 * Note: a response of 425 is not mentioned as a possible response to 2673 * the PASV command in RFC959. However, it has been blessed as 2674 * a legitimate response by Jon Postel in a telephone conversation 2675 * with Rick Adams on 25 Jan 89. 2676 */ 2677void 2678passive(void) 2679{ 2680 int len, on; 2681 char *p, *a; 2682 2683 if (pdata >= 0) /* close old port if one set */ 2684 close(pdata); 2685 2686 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2687 if (pdata < 0) { 2688 perror_reply(425, "Can't open passive connection"); 2689 return; 2690 } 2691 on = 1; 2692 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2693 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2694 2695 (void) seteuid(0); 2696 2697#ifdef IP_PORTRANGE 2698 if (ctrl_addr.su_family == AF_INET) { 2699 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2700 : IP_PORTRANGE_DEFAULT; 2701 2702 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2703 &on, sizeof(on)) < 0) 2704 goto pasv_error; 2705 } 2706#endif 2707#ifdef IPV6_PORTRANGE 2708 if (ctrl_addr.su_family == AF_INET6) { 2709 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2710 : IPV6_PORTRANGE_DEFAULT; 2711 2712 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2713 &on, sizeof(on)) < 0) 2714 goto pasv_error; 2715 } 2716#endif 2717 2718 pasv_addr = ctrl_addr; 2719 pasv_addr.su_port = 0; 2720 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2721 goto pasv_error; 2722 2723 (void) seteuid(pw->pw_uid); 2724 2725 len = sizeof(pasv_addr); 2726 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2727 goto pasv_error; 2728 if (listen(pdata, 1) < 0) 2729 goto pasv_error; 2730 if (pasv_addr.su_family == AF_INET) 2731 a = (char *) &pasv_addr.su_sin.sin_addr; 2732 else if (pasv_addr.su_family == AF_INET6 && 2733 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2734 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2735 else 2736 goto pasv_error; 2737 2738 p = (char *) &pasv_addr.su_port; 2739 2740#define UC(b) (((int) b) & 0xff) 2741 2742 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2743 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2744 return; 2745 2746pasv_error: 2747 (void) seteuid(pw->pw_uid); 2748 (void) close(pdata); 2749 pdata = -1; 2750 perror_reply(425, "Can't open passive connection"); 2751 return; 2752} 2753 2754/* 2755 * Long Passive defined in RFC 1639. 2756 * 228 Entering Long Passive Mode 2757 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2758 */ 2759 2760void 2761long_passive(char *cmd, int pf) 2762{ 2763 int len, on; 2764 char *p, *a; 2765 2766 if (pdata >= 0) /* close old port if one set */ 2767 close(pdata); 2768 2769 if (pf != PF_UNSPEC) { 2770 if (ctrl_addr.su_family != pf) { 2771 switch (ctrl_addr.su_family) { 2772 case AF_INET: 2773 pf = 1; 2774 break; 2775 case AF_INET6: 2776 pf = 2; 2777 break; 2778 default: 2779 pf = 0; 2780 break; 2781 } 2782 /* 2783 * XXX 2784 * only EPRT/EPSV ready clients will understand this 2785 */ 2786 if (strcmp(cmd, "EPSV") == 0 && pf) { 2787 reply(522, "Network protocol mismatch, " 2788 "use (%d)", pf); 2789 } else 2790 reply(501, "Network protocol mismatch."); /*XXX*/ 2791 2792 return; 2793 } 2794 } 2795 2796 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2797 if (pdata < 0) { 2798 perror_reply(425, "Can't open passive connection"); 2799 return; 2800 } 2801 on = 1; 2802 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2803 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2804 2805 (void) seteuid(0); 2806 2807 pasv_addr = ctrl_addr; 2808 pasv_addr.su_port = 0; 2809 len = pasv_addr.su_len; 2810 2811#ifdef IP_PORTRANGE 2812 if (ctrl_addr.su_family == AF_INET) { 2813 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2814 : IP_PORTRANGE_DEFAULT; 2815 2816 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2817 &on, sizeof(on)) < 0) 2818 goto pasv_error; 2819 } 2820#endif 2821#ifdef IPV6_PORTRANGE 2822 if (ctrl_addr.su_family == AF_INET6) { 2823 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2824 : IPV6_PORTRANGE_DEFAULT; 2825 2826 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2827 &on, sizeof(on)) < 0) 2828 goto pasv_error; 2829 } 2830#endif 2831 2832 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2833 goto pasv_error; 2834 2835 (void) seteuid(pw->pw_uid); 2836 2837 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2838 goto pasv_error; 2839 if (listen(pdata, 1) < 0) 2840 goto pasv_error; 2841 2842#define UC(b) (((int) b) & 0xff) 2843 2844 if (strcmp(cmd, "LPSV") == 0) { 2845 p = (char *)&pasv_addr.su_port; 2846 switch (pasv_addr.su_family) { 2847 case AF_INET: 2848 a = (char *) &pasv_addr.su_sin.sin_addr; 2849 v4_reply: 2850 reply(228, 2851"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2852 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2853 2, UC(p[0]), UC(p[1])); 2854 return; 2855 case AF_INET6: 2856 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2857 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2858 goto v4_reply; 2859 } 2860 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2861 reply(228, 2862"Entering Long Passive Mode " 2863"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2864 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2865 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2866 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2867 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2868 2, UC(p[0]), UC(p[1])); 2869 return; 2870 } 2871 } else if (strcmp(cmd, "EPSV") == 0) { 2872 switch (pasv_addr.su_family) { 2873 case AF_INET: 2874 case AF_INET6: 2875 reply(229, "Entering Extended Passive Mode (|||%d|)", 2876 ntohs(pasv_addr.su_port)); 2877 return; 2878 } 2879 } else { 2880 /* more proper error code? */ 2881 } 2882 2883pasv_error: 2884 (void) seteuid(pw->pw_uid); 2885 (void) close(pdata); 2886 pdata = -1; 2887 perror_reply(425, "Can't open passive connection"); 2888 return; 2889} 2890 2891/* 2892 * Generate unique name for file with basename "local" 2893 * and open the file in order to avoid possible races. 2894 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2895 * Return descriptor to the file, set "name" to its name. 2896 * 2897 * Generates failure reply on error. 2898 */ 2899static int 2900guniquefd(char *local, char **name) 2901{ 2902 static char new[MAXPATHLEN]; 2903 struct stat st; 2904 char *cp; 2905 int count; 2906 int fd; 2907 2908 cp = strrchr(local, '/'); 2909 if (cp) 2910 *cp = '\0'; 2911 if (stat(cp ? local : ".", &st) < 0) { 2912 perror_reply(553, cp ? local : "."); 2913 return (-1); 2914 } 2915 if (cp) { 2916 /* 2917 * Let not overwrite dirname with counter suffix. 2918 * -4 is for /nn\0 2919 * In this extreme case dot won't be put in front of suffix. 2920 */ 2921 if (strlen(local) > sizeof(new) - 4) { 2922 reply(553, "Pathname too long."); 2923 return (-1); 2924 } 2925 *cp = '/'; 2926 } 2927 /* -4 is for the .nn<null> we put on the end below */ 2928 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2929 cp = new + strlen(new); 2930 /* 2931 * Don't generate dotfile unless requested explicitly. 2932 * This covers the case when basename gets truncated off 2933 * by buffer size. 2934 */ 2935 if (cp > new && cp[-1] != '/') 2936 *cp++ = '.'; 2937 for (count = 0; count < 100; count++) { 2938 /* At count 0 try unmodified name */ 2939 if (count) 2940 (void)sprintf(cp, "%d", count); 2941 if ((fd = open(count ? new : local, 2942 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2943 *name = count ? new : local; 2944 return (fd); 2945 } 2946 if (errno != EEXIST) { 2947 perror_reply(553, count ? new : local); 2948 return (-1); 2949 } 2950 } 2951 reply(452, "Unique file name cannot be created."); 2952 return (-1); 2953} 2954 2955/* 2956 * Format and send reply containing system error number. 2957 */ 2958void 2959perror_reply(int code, char *string) 2960{ 2961 2962 reply(code, "%s: %s.", string, strerror(errno)); 2963} 2964 2965static char *onefile[] = { 2966 "", 2967 0 2968}; 2969 2970void 2971send_file_list(char *whichf) 2972{ 2973 struct stat st; 2974 DIR *dirp = NULL; 2975 struct dirent *dir; 2976 FILE *dout = NULL; 2977 char **dirlist, *dirname; 2978 int simple = 0; 2979 int freeglob = 0; 2980 glob_t gl; 2981 2982 if (strpbrk(whichf, "~{[*?") != NULL) { 2983 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2984 2985 memset(&gl, 0, sizeof(gl)); 2986 gl.gl_matchc = MAXGLOBARGS; 2987 flags |= GLOB_LIMIT; 2988 freeglob = 1; 2989 if (glob(whichf, flags, 0, &gl)) { 2990 reply(550, "No matching files found."); 2991 goto out; 2992 } else if (gl.gl_pathc == 0) { 2993 errno = ENOENT; 2994 perror_reply(550, whichf); 2995 goto out; 2996 } 2997 dirlist = gl.gl_pathv; 2998 } else { 2999 onefile[0] = whichf; 3000 dirlist = onefile; 3001 simple = 1; 3002 } 3003 3004 while ((dirname = *dirlist++)) { 3005 if (stat(dirname, &st) < 0) { 3006 /* 3007 * If user typed "ls -l", etc, and the client 3008 * used NLST, do what the user meant. 3009 */ 3010 if (dirname[0] == '-' && *dirlist == NULL && 3011 transflag == 0) { 3012 retrieve(_PATH_LS " %s", dirname); 3013 goto out; 3014 } 3015 perror_reply(550, whichf); 3016 if (dout != NULL) { 3017 (void) fclose(dout); 3018 transflag = 0; 3019 data = -1; 3020 pdata = -1; 3021 } 3022 goto out; 3023 } 3024 3025 if (S_ISREG(st.st_mode)) { 3026 if (dout == NULL) { 3027 dout = dataconn("file list", -1, "w"); 3028 if (dout == NULL) 3029 goto out; 3030 transflag++; 3031 } 3032 fprintf(dout, "%s%s\n", dirname, 3033 type == TYPE_A ? "\r" : ""); 3034 byte_count += strlen(dirname) + 1; 3035 continue; 3036 } else if (!S_ISDIR(st.st_mode)) 3037 continue; 3038 3039 if ((dirp = opendir(dirname)) == NULL) 3040 continue; 3041 3042 while ((dir = readdir(dirp)) != NULL) { 3043 char nbuf[MAXPATHLEN]; 3044 3045 if (recvurg) { 3046 myoob(); 3047 recvurg = 0; 3048 transflag = 0; 3049 goto out; 3050 } 3051 3052 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3053 continue; 3054 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3055 dir->d_namlen == 2) 3056 continue; 3057 3058 snprintf(nbuf, sizeof(nbuf), 3059 "%s/%s", dirname, dir->d_name); 3060 3061 /* 3062 * We have to do a stat to insure it's 3063 * not a directory or special file. 3064 */ 3065 if (simple || (stat(nbuf, &st) == 0 && 3066 S_ISREG(st.st_mode))) { 3067 if (dout == NULL) { 3068 dout = dataconn("file list", -1, "w"); 3069 if (dout == NULL) 3070 goto out; 3071 transflag++; 3072 } 3073 if (nbuf[0] == '.' && nbuf[1] == '/') 3074 fprintf(dout, "%s%s\n", &nbuf[2], 3075 type == TYPE_A ? "\r" : ""); 3076 else 3077 fprintf(dout, "%s%s\n", nbuf, 3078 type == TYPE_A ? "\r" : ""); 3079 byte_count += strlen(nbuf) + 1; 3080 } 3081 } 3082 (void) closedir(dirp); 3083 } 3084 3085 if (dout == NULL) 3086 reply(550, "No files found."); 3087 else if (ferror(dout) != 0) 3088 perror_reply(550, "Data connection"); 3089 else 3090 reply(226, "Transfer complete."); 3091 3092 transflag = 0; 3093 if (dout != NULL) 3094 (void) fclose(dout); 3095 data = -1; 3096 pdata = -1; 3097out: 3098 if (freeglob) { 3099 freeglob = 0; 3100 globfree(&gl); 3101 } 3102} 3103 3104void 3105reapchild(int signo) 3106{ 3107 while (waitpid(-1, NULL, WNOHANG) > 0); 3108} 3109 3110#ifdef OLD_SETPROCTITLE 3111/* 3112 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3113 * Warning, since this is usually started from inetd.conf, it often doesn't 3114 * have much of an environment or arglist to overwrite. 3115 */ 3116void 3117setproctitle(const char *fmt, ...) 3118{ 3119 int i; 3120 va_list ap; 3121 char *p, *bp, ch; 3122 char buf[LINE_MAX]; 3123 3124 va_start(ap, fmt); 3125 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3126 3127 /* make ps print our process name */ 3128 p = Argv[0]; 3129 *p++ = '-'; 3130 3131 i = strlen(buf); 3132 if (i > LastArgv - p - 2) { 3133 i = LastArgv - p - 2; 3134 buf[i] = '\0'; 3135 } 3136 bp = buf; 3137 while (ch = *bp++) 3138 if (ch != '\n' && ch != '\r') 3139 *p++ = ch; 3140 while (p < LastArgv) 3141 *p++ = ' '; 3142} 3143#endif /* OLD_SETPROCTITLE */ 3144 3145static void 3146appendf(char **strp, char *fmt, ...) 3147{ 3148 va_list ap; 3149 char *ostr, *p; 3150 3151 va_start(ap, fmt); 3152 vasprintf(&p, fmt, ap); 3153 va_end(ap); 3154 if (p == NULL) 3155 fatalerror("Ran out of memory."); 3156 if (*strp == NULL) 3157 *strp = p; 3158 else { 3159 ostr = *strp; 3160 asprintf(strp, "%s%s", ostr, p); 3161 if (*strp == NULL) 3162 fatalerror("Ran out of memory."); 3163 free(ostr); 3164 } 3165} 3166 3167static void 3168logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3169{ 3170 char *msg = NULL; 3171 char wd[MAXPATHLEN + 1]; 3172 3173 if (logging <= 1) 3174 return; 3175 /* If either filename isn't absolute, get current dir for log message. */ 3176 if ((file1 && file1[0] != '/') || (file2 && file2[0] != '/')) { 3177 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3178 strcpy(wd, strerror(errno)); 3179 } else 3180 wd[0] = '\0'; 3181 3182 appendf(&msg, "%s", cmd); 3183 if (file1) 3184 appendf(&msg, " %s", file1); 3185 if (file2) 3186 appendf(&msg, " %s", file2); 3187 if (cnt >= 0) 3188 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3189 if (wd[0]) 3190 appendf(&msg, " (wd: %s)", wd); 3191 syslog(LOG_INFO, "%s", msg); 3192 free(msg); 3193} 3194 3195static void 3196logxfer(char *name, off_t size, time_t start) 3197{ 3198 char buf[MAXPATHLEN + 1024]; 3199 char path[MAXPATHLEN + 1]; 3200 time_t now; 3201 3202 if (statfd >= 0) { 3203 time(&now); 3204 if (realpath(name, path) == NULL) { 3205 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3206 return; 3207 } 3208 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3209 ctime(&now)+4, ident, remotehost, 3210 path, (intmax_t)size, 3211 (long)(now - start + (now == start))); 3212 write(statfd, buf, strlen(buf)); 3213 } 3214} 3215 3216static char * 3217doublequote(char *s) 3218{ 3219 int n; 3220 char *p, *s2; 3221 3222 for (p = s, n = 0; *p; p++) 3223 if (*p == '"') 3224 n++; 3225 3226 if ((s2 = malloc(p - s + n + 1)) == NULL) 3227 return (NULL); 3228 3229 for (p = s2; *s; s++, p++) { 3230 if ((*p = *s) == '"') 3231 *(++p) = '"'; 3232 } 3233 *p = '\0'; 3234 3235 return (s2); 3236} 3237 3238/* setup server socket for specified address family */ 3239/* if af is PF_UNSPEC more than one socket may be returned */ 3240/* the returned list is dynamically allocated, so caller needs to free it */ 3241static int * 3242socksetup(int af, char *bindname, const char *bindport) 3243{ 3244 struct addrinfo hints, *res, *r; 3245 int error, maxs, *s, *socks; 3246 const int on = 1; 3247 3248 memset(&hints, 0, sizeof(hints)); 3249 hints.ai_flags = AI_PASSIVE; 3250 hints.ai_family = af; 3251 hints.ai_socktype = SOCK_STREAM; 3252 error = getaddrinfo(bindname, bindport, &hints, &res); 3253 if (error) { 3254 syslog(LOG_ERR, "%s", gai_strerror(error)); 3255 if (error == EAI_SYSTEM) 3256 syslog(LOG_ERR, "%s", strerror(errno)); 3257 return NULL; 3258 } 3259 3260 /* Count max number of sockets we may open */ 3261 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3262 ; 3263 socks = malloc((maxs + 1) * sizeof(int)); 3264 if (!socks) { 3265 freeaddrinfo(res); 3266 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3267 return NULL; 3268 } 3269 3270 *socks = 0; /* num of sockets counter at start of array */ 3271 s = socks + 1; 3272 for (r = res; r; r = r->ai_next) { 3273 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3274 if (*s < 0) { 3275 syslog(LOG_DEBUG, "control socket: %m"); 3276 continue; 3277 } 3278 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3279 &on, sizeof(on)) < 0) 3280 syslog(LOG_WARNING, 3281 "control setsockopt (SO_REUSEADDR): %m"); 3282 if (r->ai_family == AF_INET6) { 3283 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3284 &on, sizeof(on)) < 0) 3285 syslog(LOG_WARNING, 3286 "control setsockopt (IPV6_V6ONLY): %m"); 3287 } 3288 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3289 syslog(LOG_DEBUG, "control bind: %m"); 3290 close(*s); 3291 continue; 3292 } 3293 (*socks)++; 3294 s++; 3295 } 3296 3297 if (res) 3298 freeaddrinfo(res); 3299 3300 if (*socks == 0) { 3301 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3302 free(socks); 3303 return NULL; 3304 } 3305 return(socks); 3306} 3307