ftpd.c revision 137853
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 46static const char rcsid[] = 47 "$FreeBSD: head/libexec/ftpd/ftpd.c 137853 2004-11-18 11:50:01Z yar $"; 48#endif /* not lint */ 49 50/* 51 * FTP server. 52 */ 53#include <sys/param.h> 54#include <sys/ioctl.h> 55#include <sys/mman.h> 56#include <sys/socket.h> 57#include <sys/stat.h> 58#include <sys/time.h> 59#include <sys/wait.h> 60 61#include <netinet/in.h> 62#include <netinet/in_systm.h> 63#include <netinet/ip.h> 64#include <netinet/tcp.h> 65 66#define FTP_NAMES 67#include <arpa/ftp.h> 68#include <arpa/inet.h> 69#include <arpa/telnet.h> 70 71#include <ctype.h> 72#include <dirent.h> 73#include <err.h> 74#include <errno.h> 75#include <fcntl.h> 76#include <glob.h> 77#include <limits.h> 78#include <netdb.h> 79#include <pwd.h> 80#include <grp.h> 81#include <opie.h> 82#include <signal.h> 83#include <stdint.h> 84#include <stdio.h> 85#include <stdlib.h> 86#include <string.h> 87#include <syslog.h> 88#include <time.h> 89#include <unistd.h> 90#include <libutil.h> 91#ifdef LOGIN_CAP 92#include <login_cap.h> 93#endif 94 95#ifdef USE_PAM 96#include <security/pam_appl.h> 97#endif 98 99#include "pathnames.h" 100#include "extern.h" 101 102#include <stdarg.h> 103 104static char version[] = "Version 6.00LS"; 105#undef main 106 107extern off_t restart_point; 108extern char cbuf[]; 109 110union sockunion ctrl_addr; 111union sockunion data_source; 112union sockunion data_dest; 113union sockunion his_addr; 114union sockunion pasv_addr; 115 116int daemon_mode; 117int data; 118int dataport; 119int hostinfo = 1; /* print host-specific info in messages */ 120int logged_in; 121struct passwd *pw; 122char *homedir; 123int ftpdebug; 124int timeout = 900; /* timeout after 15 minutes of inactivity */ 125int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 126int logging; 127int restricted_data_ports = 1; 128int paranoid = 1; /* be extra careful about security */ 129int anon_only = 0; /* Only anonymous ftp allowed */ 130int guest; 131int dochroot; 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 148static volatile sig_atomic_t recvurg; 149sig_atomic_t transflag; 150off_t file_size; 151off_t byte_count; 152#if !defined(CMASK) || CMASK == 0 153#undef CMASK 154#define CMASK 027 155#endif 156int defumask = CMASK; /* default umask value */ 157char tmpline[7]; 158char *hostname; 159int epsvall = 0; 160 161#ifdef VIRTUAL_HOSTING 162char *ftpuser; 163 164static struct ftphost { 165 struct ftphost *next; 166 struct addrinfo *hostinfo; 167 char *hostname; 168 char *anonuser; 169 char *statfile; 170 char *welcome; 171 char *loginmsg; 172} *thishost, *firsthost; 173 174#endif 175char remotehost[MAXHOSTNAMELEN]; 176char *ident = NULL; 177 178static char ttyline[20]; 179char *tty = ttyline; /* for klogin */ 180 181#ifdef USE_PAM 182static int auth_pam(struct passwd**, const char*); 183pam_handle_t *pamh = NULL; 184#endif 185 186static struct opie opiedata; 187static char opieprompt[OPIE_CHALLENGE_MAX+1]; 188static int pwok; 189 190char *pid_file = NULL; 191 192/* 193 * Limit number of pathnames that glob can return. 194 * A limit of 0 indicates the number of pathnames is unlimited. 195 */ 196#define MAXGLOBARGS 16384 197# 198 199/* 200 * Timeout intervals for retrying connections 201 * to hosts that don't accept PORT cmds. This 202 * is a kludge, but given the problems with TCP... 203 */ 204#define SWAITMAX 90 /* wait at most 90 seconds */ 205#define SWAITINT 5 /* interval between retries */ 206 207int swaitmax = SWAITMAX; 208int swaitint = SWAITINT; 209 210#ifdef SETPROCTITLE 211#ifdef OLD_SETPROCTITLE 212char **Argv = NULL; /* pointer to argument vector */ 213char *LastArgv = NULL; /* end of argv */ 214#endif /* OLD_SETPROCTITLE */ 215char proctitle[LINE_MAX]; /* initial part of title */ 216#endif /* SETPROCTITLE */ 217 218#define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 219#define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 220#define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 221 222#ifdef VIRTUAL_HOSTING 223static void inithosts(void); 224static void selecthost(union sockunion *); 225#endif 226static void ack(char *); 227static void sigurg(int); 228static void myoob(void); 229static int checkuser(char *, char *, int, char **); 230static FILE *dataconn(char *, off_t, char *); 231static void dolog(struct sockaddr *); 232static void end_login(void); 233static FILE *getdatasock(char *); 234static int guniquefd(char *, char **); 235static void lostconn(int); 236static void sigquit(int); 237static int receive_data(FILE *, FILE *); 238static int send_data(FILE *, FILE *, size_t, off_t, int); 239static struct passwd * 240 sgetpwnam(char *); 241static char *sgetsave(char *); 242static void reapchild(int); 243static void appendf(char **, char *, ...) __printflike(2, 3); 244static void logcmd(char *, char *, char *, off_t); 245static void logxfer(char *, off_t, time_t); 246static char *doublequote(char *); 247static int *socksetup(int, char *, const char *); 248 249int 250main(int argc, char *argv[], char **envp) 251{ 252 int addrlen, ch, on = 1, tos; 253 char *cp, line[LINE_MAX]; 254 FILE *fd; 255 char *bindname = NULL; 256 const char *bindport = "ftp"; 257 int family = AF_UNSPEC; 258 struct sigaction sa; 259 260 tzset(); /* in case no timezone database in ~ftp */ 261 sigemptyset(&sa.sa_mask); 262 sa.sa_flags = SA_RESTART; 263 264#ifdef OLD_SETPROCTITLE 265 /* 266 * Save start and extent of argv for setproctitle. 267 */ 268 Argv = argv; 269 while (*envp) 270 envp++; 271 LastArgv = envp[-1] + strlen(envp[-1]); 272#endif /* OLD_SETPROCTITLE */ 273 274 275 while ((ch = getopt(argc, argv, 276 "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 277 switch (ch) { 278 case '4': 279 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 280 break; 281 282 case '6': 283 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 284 break; 285 286 case 'a': 287 bindname = optarg; 288 break; 289 290 case 'A': 291 anon_only = 1; 292 break; 293 294 case 'd': 295 ftpdebug++; 296 break; 297 298 case 'D': 299 daemon_mode++; 300 break; 301 302 case 'E': 303 noepsv = 1; 304 break; 305 306 case 'h': 307 hostinfo = 0; 308 break; 309 310 case 'l': 311 logging++; /* > 1 == extra logging */ 312 break; 313 314 case 'm': 315 noguestmod = 0; 316 break; 317 318 case 'M': 319 noguestmkd = 1; 320 break; 321 322 case 'o': 323 noretr = 1; 324 break; 325 326 case 'O': 327 noguestretr = 1; 328 break; 329 330 case 'p': 331 pid_file = optarg; 332 break; 333 334 case 'P': 335 bindport = optarg; 336 break; 337 338 case 'r': 339 readonly = 1; 340 break; 341 342 case 'R': 343 paranoid = 0; 344 break; 345 346 case 'S': 347 stats++; 348 break; 349 350 case 't': 351 timeout = atoi(optarg); 352 if (maxtimeout < timeout) 353 maxtimeout = timeout; 354 break; 355 356 case 'T': 357 maxtimeout = atoi(optarg); 358 if (timeout > maxtimeout) 359 timeout = maxtimeout; 360 break; 361 362 case 'u': 363 { 364 long val = 0; 365 366 val = strtol(optarg, &optarg, 8); 367 if (*optarg != '\0' || val < 0) 368 warnx("bad value for -u"); 369 else 370 defumask = val; 371 break; 372 } 373 case 'U': 374 restricted_data_ports = 0; 375 break; 376 377 case 'v': 378 ftpdebug++; 379 break; 380 381 case 'W': 382 dowtmp = 0; 383 break; 384 385 default: 386 warnx("unknown flag -%c ignored", optopt); 387 break; 388 } 389 } 390 391#ifdef VIRTUAL_HOSTING 392 inithosts(); 393#endif 394 (void) freopen(_PATH_DEVNULL, "w", stderr); 395 396 /* 397 * LOG_NDELAY sets up the logging connection immediately, 398 * necessary for anonymous ftp's that chroot and can't do it later. 399 */ 400 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 401 402 if (daemon_mode) { 403 int *ctl_sock, fd, maxfd = -1, nfds, i; 404 fd_set defreadfds, readfds; 405 pid_t pid; 406 407 /* 408 * Detach from parent. 409 */ 410 if (daemon(1, 1) < 0) { 411 syslog(LOG_ERR, "failed to become a daemon"); 412 exit(1); 413 } 414 sa.sa_handler = reapchild; 415 (void)sigaction(SIGCHLD, &sa, NULL); 416 417 /* 418 * Open a socket, bind it to the FTP port, and start 419 * listening. 420 */ 421 ctl_sock = socksetup(family, bindname, bindport); 422 if (ctl_sock == NULL) 423 exit(1); 424 425 FD_ZERO(&defreadfds); 426 for (i = 1; i <= *ctl_sock; i++) { 427 FD_SET(ctl_sock[i], &defreadfds); 428 if (listen(ctl_sock[i], 32) < 0) { 429 syslog(LOG_ERR, "control listen: %m"); 430 exit(1); 431 } 432 if (maxfd < ctl_sock[i]) 433 maxfd = ctl_sock[i]; 434 } 435 436 /* 437 * Atomically write process ID 438 */ 439 if (pid_file) 440 { 441 int fd; 442 char buf[20]; 443 444 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 445 | O_NONBLOCK | O_EXLOCK, 0644); 446 if (fd < 0) { 447 if (errno == EAGAIN) 448 errx(1, "%s: file locked", pid_file); 449 else 450 err(1, "%s", pid_file); 451 } 452 snprintf(buf, sizeof(buf), 453 "%lu\n", (unsigned long) getpid()); 454 if (write(fd, buf, strlen(buf)) < 0) 455 err(1, "%s: write", pid_file); 456 /* Leave the pid file open and locked */ 457 } 458 /* 459 * Loop forever accepting connection requests and forking off 460 * children to handle them. 461 */ 462 while (1) { 463 FD_COPY(&defreadfds, &readfds); 464 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 465 if (nfds <= 0) { 466 if (nfds < 0 && errno != EINTR) 467 syslog(LOG_WARNING, "select: %m"); 468 continue; 469 } 470 471 pid = -1; 472 for (i = 1; i <= *ctl_sock; i++) 473 if (FD_ISSET(ctl_sock[i], &readfds)) { 474 addrlen = sizeof(his_addr); 475 fd = accept(ctl_sock[i], 476 (struct sockaddr *)&his_addr, 477 &addrlen); 478 if (fd >= 0) { 479 if ((pid = fork()) == 0) { 480 /* child */ 481 (void) dup2(fd, 0); 482 (void) dup2(fd, 1); 483 close(ctl_sock[i]); 484 } else 485 close(fd); 486 } 487 } 488 if (pid == 0) 489 break; 490 } 491 } else { 492 addrlen = sizeof(his_addr); 493 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 494 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 495 exit(1); 496 } 497 } 498 499 sa.sa_handler = SIG_DFL; 500 (void)sigaction(SIGCHLD, &sa, NULL); 501 502 sa.sa_handler = sigurg; 503 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 504 (void)sigaction(SIGURG, &sa, NULL); 505 506 sigfillset(&sa.sa_mask); /* block all signals in handler */ 507 sa.sa_flags = SA_RESTART; 508 sa.sa_handler = sigquit; 509 (void)sigaction(SIGHUP, &sa, NULL); 510 (void)sigaction(SIGINT, &sa, NULL); 511 (void)sigaction(SIGQUIT, &sa, NULL); 512 (void)sigaction(SIGTERM, &sa, NULL); 513 514 sa.sa_handler = lostconn; 515 (void)sigaction(SIGPIPE, &sa, NULL); 516 517 addrlen = sizeof(ctrl_addr); 518 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 519 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 520 exit(1); 521 } 522 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 523#ifdef VIRTUAL_HOSTING 524 /* select our identity from virtual host table */ 525 selecthost(&ctrl_addr); 526#endif 527#ifdef IP_TOS 528 if (ctrl_addr.su_family == AF_INET) 529 { 530 tos = IPTOS_LOWDELAY; 531 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 532 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 533 } 534#endif 535 /* 536 * Disable Nagle on the control channel so that we don't have to wait 537 * for peer's ACK before issuing our next reply. 538 */ 539 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 540 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 541 542 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 543 544 /* set this here so klogin can use it... */ 545 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 546 547 /* Try to handle urgent data inline */ 548#ifdef SO_OOBINLINE 549 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 550 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 551#endif 552 553#ifdef F_SETOWN 554 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 555 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 556#endif 557 dolog((struct sockaddr *)&his_addr); 558 /* 559 * Set up default state 560 */ 561 data = -1; 562 type = TYPE_A; 563 form = FORM_N; 564 stru = STRU_F; 565 mode = MODE_S; 566 tmpline[0] = '\0'; 567 568 /* If logins are disabled, print out the message. */ 569 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 570 while (fgets(line, sizeof(line), fd) != NULL) { 571 if ((cp = strchr(line, '\n')) != NULL) 572 *cp = '\0'; 573 lreply(530, "%s", line); 574 } 575 (void) fflush(stdout); 576 (void) fclose(fd); 577 reply(530, "System not available."); 578 exit(0); 579 } 580#ifdef VIRTUAL_HOSTING 581 fd = fopen(thishost->welcome, "r"); 582#else 583 fd = fopen(_PATH_FTPWELCOME, "r"); 584#endif 585 if (fd != NULL) { 586 while (fgets(line, sizeof(line), fd) != NULL) { 587 if ((cp = strchr(line, '\n')) != NULL) 588 *cp = '\0'; 589 lreply(220, "%s", line); 590 } 591 (void) fflush(stdout); 592 (void) fclose(fd); 593 /* reply(220,) must follow */ 594 } 595#ifndef VIRTUAL_HOSTING 596 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 597 fatalerror("Ran out of memory."); 598 (void) gethostname(hostname, MAXHOSTNAMELEN - 1); 599 hostname[MAXHOSTNAMELEN - 1] = '\0'; 600#endif 601 if (hostinfo) 602 reply(220, "%s FTP server (%s) ready.", hostname, version); 603 else 604 reply(220, "FTP server ready."); 605 for (;;) 606 (void) yyparse(); 607 /* NOTREACHED */ 608} 609 610static void 611lostconn(int signo) 612{ 613 614 if (ftpdebug) 615 syslog(LOG_DEBUG, "lost connection"); 616 dologout(1); 617} 618 619static void 620sigquit(int signo) 621{ 622 623 syslog(LOG_ERR, "got signal %d", signo); 624 dologout(1); 625} 626 627#ifdef VIRTUAL_HOSTING 628/* 629 * read in virtual host tables (if they exist) 630 */ 631 632static void 633inithosts(void) 634{ 635 int insert; 636 size_t len; 637 FILE *fp; 638 char *cp, *mp, *line; 639 char *hostname; 640 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 641 struct ftphost *hrp, *lhrp; 642 struct addrinfo hints, *res, *ai; 643 644 /* 645 * Fill in the default host information 646 */ 647 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 648 fatalerror("Ran out of memory."); 649 if (gethostname(hostname, MAXHOSTNAMELEN) < 0) 650 hostname[0] = '\0'; 651 hostname[MAXHOSTNAMELEN - 1] = '\0'; 652 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 653 fatalerror("Ran out of memory."); 654 hrp->hostname = hostname; 655 hrp->hostinfo = NULL; 656 657 memset(&hints, 0, sizeof(hints)); 658 hints.ai_flags = AI_CANONNAME; 659 hints.ai_family = AF_UNSPEC; 660 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 661 hrp->hostinfo = res; 662 hrp->statfile = _PATH_FTPDSTATFILE; 663 hrp->welcome = _PATH_FTPWELCOME; 664 hrp->loginmsg = _PATH_FTPLOGINMESG; 665 hrp->anonuser = "ftp"; 666 hrp->next = NULL; 667 thishost = firsthost = lhrp = hrp; 668 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 669 int addrsize, gothost; 670 void *addr; 671 struct hostent *hp; 672 673 while ((line = fgetln(fp, &len)) != NULL) { 674 int i, hp_error; 675 676 /* skip comments */ 677 if (line[0] == '#') 678 continue; 679 if (line[len - 1] == '\n') { 680 line[len - 1] = '\0'; 681 mp = NULL; 682 } else { 683 if ((mp = malloc(len + 1)) == NULL) 684 fatalerror("Ran out of memory."); 685 memcpy(mp, line, len); 686 mp[len] = '\0'; 687 line = mp; 688 } 689 cp = strtok(line, " \t"); 690 /* skip empty lines */ 691 if (cp == NULL) 692 goto nextline; 693 vhost = cp; 694 695 /* set defaults */ 696 anonuser = "ftp"; 697 statfile = _PATH_FTPDSTATFILE; 698 welcome = _PATH_FTPWELCOME; 699 loginmsg = _PATH_FTPLOGINMESG; 700 701 /* 702 * Preparse the line so we can use its info 703 * for all the addresses associated with 704 * the virtual host name. 705 * Field 0, the virtual host name, is special: 706 * it's already parsed off and will be strdup'ed 707 * later, after we know its canonical form. 708 */ 709 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 710 if (*cp != '-' && (cp = strdup(cp))) 711 switch (i) { 712 case 1: /* anon user permissions */ 713 anonuser = cp; 714 break; 715 case 2: /* statistics file */ 716 statfile = cp; 717 break; 718 case 3: /* welcome message */ 719 welcome = cp; 720 break; 721 case 4: /* login message */ 722 loginmsg = cp; 723 break; 724 default: /* programming error */ 725 abort(); 726 /* NOTREACHED */ 727 } 728 729 hints.ai_flags = 0; 730 hints.ai_family = AF_UNSPEC; 731 hints.ai_flags = AI_PASSIVE; 732 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 733 goto nextline; 734 for (ai = res; ai != NULL && ai->ai_addr != NULL; 735 ai = ai->ai_next) { 736 737 gothost = 0; 738 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 739 struct addrinfo *hi; 740 741 for (hi = hrp->hostinfo; hi != NULL; 742 hi = hi->ai_next) 743 if (hi->ai_addrlen == ai->ai_addrlen && 744 memcmp(hi->ai_addr, 745 ai->ai_addr, 746 ai->ai_addr->sa_len) == 0) { 747 gothost++; 748 break; 749 } 750 if (gothost) 751 break; 752 } 753 if (hrp == NULL) { 754 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 755 goto nextline; 756 hrp->hostname = NULL; 757 insert = 1; 758 } else { 759 if (hrp->hostinfo && hrp->hostinfo != res) 760 freeaddrinfo(hrp->hostinfo); 761 insert = 0; /* host already in the chain */ 762 } 763 hrp->hostinfo = res; 764 765 /* 766 * determine hostname to use. 767 * force defined name if there is a valid alias 768 * otherwise fallback to primary hostname 769 */ 770 /* XXX: getaddrinfo() can't do alias check */ 771 switch(hrp->hostinfo->ai_family) { 772 case AF_INET: 773 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 774 addrsize = sizeof(struct in_addr); 775 break; 776 case AF_INET6: 777 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 778 addrsize = sizeof(struct in6_addr); 779 break; 780 default: 781 /* should not reach here */ 782 freeaddrinfo(hrp->hostinfo); 783 if (insert) 784 free(hrp); /*not in chain, can free*/ 785 else 786 hrp->hostinfo = NULL; /*mark as blank*/ 787 goto nextline; 788 /* NOTREACHED */ 789 } 790 if ((hp = getipnodebyaddr(addr, addrsize, 791 hrp->hostinfo->ai_family, 792 &hp_error)) != NULL) { 793 if (strcmp(vhost, hp->h_name) != 0) { 794 if (hp->h_aliases == NULL) 795 vhost = hp->h_name; 796 else { 797 i = 0; 798 while (hp->h_aliases[i] && 799 strcmp(vhost, hp->h_aliases[i]) != 0) 800 ++i; 801 if (hp->h_aliases[i] == NULL) 802 vhost = hp->h_name; 803 } 804 } 805 } 806 if (hrp->hostname && 807 strcmp(hrp->hostname, vhost) != 0) { 808 free(hrp->hostname); 809 hrp->hostname = NULL; 810 } 811 if (hrp->hostname == NULL && 812 (hrp->hostname = strdup(vhost)) == NULL) { 813 freeaddrinfo(hrp->hostinfo); 814 hrp->hostinfo = NULL; /* mark as blank */ 815 if (hp) 816 freehostent(hp); 817 goto nextline; 818 } 819 hrp->anonuser = anonuser; 820 hrp->statfile = statfile; 821 hrp->welcome = welcome; 822 hrp->loginmsg = loginmsg; 823 if (insert) { 824 hrp->next = NULL; 825 lhrp->next = hrp; 826 lhrp = hrp; 827 } 828 if (hp) 829 freehostent(hp); 830 } 831nextline: 832 if (mp) 833 free(mp); 834 } 835 (void) fclose(fp); 836 } 837} 838 839static void 840selecthost(union sockunion *su) 841{ 842 struct ftphost *hrp; 843 u_int16_t port; 844#ifdef INET6 845 struct in6_addr *mapped_in6 = NULL; 846#endif 847 struct addrinfo *hi; 848 849#ifdef INET6 850 /* 851 * XXX IPv4 mapped IPv6 addr consideraton, 852 * specified in rfc2373. 853 */ 854 if (su->su_family == AF_INET6 && 855 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 856 mapped_in6 = &su->su_sin6.sin6_addr; 857#endif 858 859 hrp = thishost = firsthost; /* default */ 860 port = su->su_port; 861 su->su_port = 0; 862 while (hrp != NULL) { 863 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 864 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 865 thishost = hrp; 866 break; 867 } 868#ifdef INET6 869 /* XXX IPv4 mapped IPv6 addr consideraton */ 870 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 871 (memcmp(&mapped_in6->s6_addr[12], 872 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 873 sizeof(struct in_addr)) == 0)) { 874 thishost = hrp; 875 break; 876 } 877#endif 878 } 879 hrp = hrp->next; 880 } 881 su->su_port = port; 882 /* setup static variables as appropriate */ 883 hostname = thishost->hostname; 884 ftpuser = thishost->anonuser; 885} 886#endif 887 888/* 889 * Helper function for sgetpwnam(). 890 */ 891static char * 892sgetsave(char *s) 893{ 894 char *new = malloc(strlen(s) + 1); 895 896 if (new == NULL) { 897 reply(421, "Ran out of memory."); 898 dologout(1); 899 /* NOTREACHED */ 900 } 901 (void) strcpy(new, s); 902 return (new); 903} 904 905/* 906 * Save the result of a getpwnam. Used for USER command, since 907 * the data returned must not be clobbered by any other command 908 * (e.g., globbing). 909 * NB: The data returned by sgetpwnam() will remain valid until 910 * the next call to this function. Its difference from getpwnam() 911 * is that sgetpwnam() is known to be called from ftpd code only. 912 */ 913static struct passwd * 914sgetpwnam(char *name) 915{ 916 static struct passwd save; 917 struct passwd *p; 918 919 if ((p = getpwnam(name)) == NULL) 920 return (p); 921 if (save.pw_name) { 922 free(save.pw_name); 923 free(save.pw_passwd); 924 free(save.pw_gecos); 925 free(save.pw_dir); 926 free(save.pw_shell); 927 } 928 save = *p; 929 save.pw_name = sgetsave(p->pw_name); 930 save.pw_passwd = sgetsave(p->pw_passwd); 931 save.pw_gecos = sgetsave(p->pw_gecos); 932 save.pw_dir = sgetsave(p->pw_dir); 933 save.pw_shell = sgetsave(p->pw_shell); 934 return (&save); 935} 936 937static int login_attempts; /* number of failed login attempts */ 938static int askpasswd; /* had user command, ask for passwd */ 939static char curname[MAXLOGNAME]; /* current USER name */ 940 941/* 942 * USER command. 943 * Sets global passwd pointer pw if named account exists and is acceptable; 944 * sets askpasswd if a PASS command is expected. If logged in previously, 945 * need to reset state. If name is "ftp" or "anonymous", the name is not in 946 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 947 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 948 * requesting login privileges. Disallow anyone who does not have a standard 949 * shell as returned by getusershell(). Disallow anyone mentioned in the file 950 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 951 */ 952void 953user(char *name) 954{ 955 char *cp, *shell; 956 957 if (logged_in) { 958 if (guest) { 959 reply(530, "Can't change user from guest login."); 960 return; 961 } else if (dochroot) { 962 reply(530, "Can't change user from chroot user."); 963 return; 964 } 965 end_login(); 966 } 967 968 guest = 0; 969#ifdef VIRTUAL_HOSTING 970 pw = sgetpwnam(thishost->anonuser); 971#else 972 pw = sgetpwnam("ftp"); 973#endif 974 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 975 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 976 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 977 reply(530, "User %s access denied.", name); 978 else if (pw != NULL) { 979 guest = 1; 980 askpasswd = 1; 981 reply(331, 982 "Guest login ok, send your email address as password."); 983 } else 984 reply(530, "User %s unknown.", name); 985 if (!askpasswd && logging) 986 syslog(LOG_NOTICE, 987 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 988 return; 989 } 990 if (anon_only != 0) { 991 reply(530, "Sorry, only anonymous ftp allowed."); 992 return; 993 } 994 995 if ((pw = sgetpwnam(name))) { 996 if ((shell = pw->pw_shell) == NULL || *shell == 0) 997 shell = _PATH_BSHELL; 998 setusershell(); 999 while ((cp = getusershell()) != NULL) 1000 if (strcmp(cp, shell) == 0) 1001 break; 1002 endusershell(); 1003 1004 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1005 reply(530, "User %s access denied.", name); 1006 if (logging) 1007 syslog(LOG_NOTICE, 1008 "FTP LOGIN REFUSED FROM %s, %s", 1009 remotehost, name); 1010 pw = NULL; 1011 return; 1012 } 1013 } 1014 if (logging) 1015 strncpy(curname, name, sizeof(curname)-1); 1016 1017 pwok = 0; 1018#ifdef USE_PAM 1019 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1020#endif 1021 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1022 pwok = (pw != NULL) && 1023 opieaccessfile(remotehost) && 1024 opiealways(pw->pw_dir); 1025 reply(331, "Response to %s %s for %s.", 1026 opieprompt, pwok ? "requested" : "required", name); 1027 } else { 1028 pwok = 1; 1029 reply(331, "Password required for %s.", name); 1030 } 1031 askpasswd = 1; 1032 /* 1033 * Delay before reading passwd after first failed 1034 * attempt to slow down passwd-guessing programs. 1035 */ 1036 if (login_attempts) 1037 sleep(login_attempts); 1038} 1039 1040/* 1041 * Check if a user is in the file "fname", 1042 * return a pointer to a malloc'd string with the rest 1043 * of the matching line in "residue" if not NULL. 1044 */ 1045static int 1046checkuser(char *fname, char *name, int pwset, char **residue) 1047{ 1048 FILE *fd; 1049 int found = 0; 1050 size_t len; 1051 char *line, *mp, *p; 1052 1053 if ((fd = fopen(fname, "r")) != NULL) { 1054 while (!found && (line = fgetln(fd, &len)) != NULL) { 1055 /* skip comments */ 1056 if (line[0] == '#') 1057 continue; 1058 if (line[len - 1] == '\n') { 1059 line[len - 1] = '\0'; 1060 mp = NULL; 1061 } else { 1062 if ((mp = malloc(len + 1)) == NULL) 1063 fatalerror("Ran out of memory."); 1064 memcpy(mp, line, len); 1065 mp[len] = '\0'; 1066 line = mp; 1067 } 1068 /* avoid possible leading and trailing whitespace */ 1069 p = strtok(line, " \t"); 1070 /* skip empty lines */ 1071 if (p == NULL) 1072 goto nextline; 1073 /* 1074 * if first chr is '@', check group membership 1075 */ 1076 if (p[0] == '@') { 1077 int i = 0; 1078 struct group *grp; 1079 1080 if (p[1] == '\0') /* single @ matches anyone */ 1081 found = 1; 1082 else { 1083 if ((grp = getgrnam(p+1)) == NULL) 1084 goto nextline; 1085 /* 1086 * Check user's default group 1087 */ 1088 if (pwset && grp->gr_gid == pw->pw_gid) 1089 found = 1; 1090 /* 1091 * Check supplementary groups 1092 */ 1093 while (!found && grp->gr_mem[i]) 1094 found = strcmp(name, 1095 grp->gr_mem[i++]) 1096 == 0; 1097 } 1098 } 1099 /* 1100 * Otherwise, just check for username match 1101 */ 1102 else 1103 found = strcmp(p, name) == 0; 1104 /* 1105 * Save the rest of line to "residue" if matched 1106 */ 1107 if (found && residue) { 1108 if ((p = strtok(NULL, "")) != NULL) 1109 p += strspn(p, " \t"); 1110 if (p && *p) { 1111 if ((*residue = strdup(p)) == NULL) 1112 fatalerror("Ran out of memory."); 1113 } else 1114 *residue = NULL; 1115 } 1116nextline: 1117 if (mp) 1118 free(mp); 1119 } 1120 (void) fclose(fd); 1121 } 1122 return (found); 1123} 1124 1125/* 1126 * Terminate login as previous user, if any, resetting state; 1127 * used when USER command is given or login fails. 1128 */ 1129static void 1130end_login(void) 1131{ 1132#ifdef USE_PAM 1133 int e; 1134#endif 1135 1136 (void) seteuid(0); 1137 if (logged_in && dowtmp) 1138 ftpd_logwtmp(ttyline, "", NULL); 1139 pw = NULL; 1140#ifdef LOGIN_CAP 1141 setusercontext(NULL, getpwuid(0), 0, 1142 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1143 LOGIN_SETMAC); 1144#endif 1145#ifdef USE_PAM 1146 if (pamh) { 1147 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1148 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1149 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1150 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1151 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1152 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1153 pamh = NULL; 1154 } 1155#endif 1156 logged_in = 0; 1157 guest = 0; 1158 dochroot = 0; 1159} 1160 1161#ifdef USE_PAM 1162 1163/* 1164 * the following code is stolen from imap-uw PAM authentication module and 1165 * login.c 1166 */ 1167#define COPY_STRING(s) (s ? strdup(s) : NULL) 1168 1169struct cred_t { 1170 const char *uname; /* user name */ 1171 const char *pass; /* password */ 1172}; 1173typedef struct cred_t cred_t; 1174 1175static int 1176auth_conv(int num_msg, const struct pam_message **msg, 1177 struct pam_response **resp, void *appdata) 1178{ 1179 int i; 1180 cred_t *cred = (cred_t *) appdata; 1181 struct pam_response *reply; 1182 1183 reply = calloc(num_msg, sizeof *reply); 1184 if (reply == NULL) 1185 return PAM_BUF_ERR; 1186 1187 for (i = 0; i < num_msg; i++) { 1188 switch (msg[i]->msg_style) { 1189 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1190 reply[i].resp_retcode = PAM_SUCCESS; 1191 reply[i].resp = COPY_STRING(cred->uname); 1192 /* PAM frees resp. */ 1193 break; 1194 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1195 reply[i].resp_retcode = PAM_SUCCESS; 1196 reply[i].resp = COPY_STRING(cred->pass); 1197 /* PAM frees resp. */ 1198 break; 1199 case PAM_TEXT_INFO: 1200 case PAM_ERROR_MSG: 1201 reply[i].resp_retcode = PAM_SUCCESS; 1202 reply[i].resp = NULL; 1203 break; 1204 default: /* unknown message style */ 1205 free(reply); 1206 return PAM_CONV_ERR; 1207 } 1208 } 1209 1210 *resp = reply; 1211 return PAM_SUCCESS; 1212} 1213 1214/* 1215 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1216 * authenticated, or 1 if not authenticated. If some sort of PAM system 1217 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1218 * function returns -1. This can be used as an indication that we should 1219 * fall back to a different authentication mechanism. 1220 */ 1221static int 1222auth_pam(struct passwd **ppw, const char *pass) 1223{ 1224 const char *tmpl_user; 1225 const void *item; 1226 int rval; 1227 int e; 1228 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1229 struct pam_conv conv = { &auth_conv, &auth_cred }; 1230 1231 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1232 if (e != PAM_SUCCESS) { 1233 /* 1234 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1235 * if context creation has failed in the first place. 1236 */ 1237 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1238 return -1; 1239 } 1240 1241 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1242 if (e != PAM_SUCCESS) { 1243 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1244 pam_strerror(pamh, e)); 1245 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1246 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1247 } 1248 pamh = NULL; 1249 return -1; 1250 } 1251 1252 e = pam_authenticate(pamh, 0); 1253 switch (e) { 1254 case PAM_SUCCESS: 1255 /* 1256 * With PAM we support the concept of a "template" 1257 * user. The user enters a login name which is 1258 * authenticated by PAM, usually via a remote service 1259 * such as RADIUS or TACACS+. If authentication 1260 * succeeds, a different but related "template" name 1261 * is used for setting the credentials, shell, and 1262 * home directory. The name the user enters need only 1263 * exist on the remote authentication server, but the 1264 * template name must be present in the local password 1265 * database. 1266 * 1267 * This is supported by two various mechanisms in the 1268 * individual modules. However, from the application's 1269 * point of view, the template user is always passed 1270 * back as a changed value of the PAM_USER item. 1271 */ 1272 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1273 PAM_SUCCESS) { 1274 tmpl_user = (const char *) item; 1275 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1276 *ppw = getpwnam(tmpl_user); 1277 } else 1278 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1279 pam_strerror(pamh, e)); 1280 rval = 0; 1281 break; 1282 1283 case PAM_AUTH_ERR: 1284 case PAM_USER_UNKNOWN: 1285 case PAM_MAXTRIES: 1286 rval = 1; 1287 break; 1288 1289 default: 1290 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1291 rval = -1; 1292 break; 1293 } 1294 1295 if (rval == 0) { 1296 e = pam_acct_mgmt(pamh, 0); 1297 if (e == PAM_NEW_AUTHTOK_REQD) { 1298 e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); 1299 if (e != PAM_SUCCESS) { 1300 syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); 1301 rval = 1; 1302 } 1303 } else if (e != PAM_SUCCESS) { 1304 rval = 1; 1305 } 1306 } 1307 1308 if (rval != 0) { 1309 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1310 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1311 } 1312 pamh = NULL; 1313 } 1314 return rval; 1315} 1316 1317#endif /* USE_PAM */ 1318 1319void 1320pass(char *passwd) 1321{ 1322 int rval; 1323 FILE *fd; 1324#ifdef LOGIN_CAP 1325 login_cap_t *lc = NULL; 1326#endif 1327#ifdef USE_PAM 1328 int e; 1329#endif 1330 char *chrootdir; 1331 char *residue = NULL; 1332 char *xpasswd; 1333 1334 if (logged_in || askpasswd == 0) { 1335 reply(503, "Login with USER first."); 1336 return; 1337 } 1338 askpasswd = 0; 1339 if (!guest) { /* "ftp" is only account allowed no password */ 1340 if (pw == NULL) { 1341 rval = 1; /* failure below */ 1342 goto skip; 1343 } 1344#ifdef USE_PAM 1345 rval = auth_pam(&pw, passwd); 1346 if (rval >= 0) { 1347 opieunlock(); 1348 goto skip; 1349 } 1350#endif 1351 if (opieverify(&opiedata, passwd) == 0) 1352 xpasswd = pw->pw_passwd; 1353 else if (pwok) { 1354 xpasswd = crypt(passwd, pw->pw_passwd); 1355 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1356 xpasswd = ":"; 1357 } else { 1358 rval = 1; 1359 goto skip; 1360 } 1361 rval = strcmp(pw->pw_passwd, xpasswd); 1362 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1363 rval = 1; /* failure */ 1364skip: 1365 /* 1366 * If rval == 1, the user failed the authentication check 1367 * above. If rval == 0, either PAM or local authentication 1368 * succeeded. 1369 */ 1370 if (rval) { 1371 reply(530, "Login incorrect."); 1372 if (logging) { 1373 syslog(LOG_NOTICE, 1374 "FTP LOGIN FAILED FROM %s", 1375 remotehost); 1376 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1377 "FTP LOGIN FAILED FROM %s, %s", 1378 remotehost, curname); 1379 } 1380 pw = NULL; 1381 if (login_attempts++ >= 5) { 1382 syslog(LOG_NOTICE, 1383 "repeated login failures from %s", 1384 remotehost); 1385 exit(0); 1386 } 1387 return; 1388 } 1389 } 1390 login_attempts = 0; /* this time successful */ 1391 if (setegid(pw->pw_gid) < 0) { 1392 reply(550, "Can't set gid."); 1393 return; 1394 } 1395 /* May be overridden by login.conf */ 1396 (void) umask(defumask); 1397#ifdef LOGIN_CAP 1398 if ((lc = login_getpwclass(pw)) != NULL) { 1399 char remote_ip[MAXHOSTNAMELEN]; 1400 1401 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1402 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1403 NI_NUMERICHOST); 1404 remote_ip[sizeof(remote_ip) - 1] = 0; 1405 if (!auth_hostok(lc, remotehost, remote_ip)) { 1406 syslog(LOG_INFO|LOG_AUTH, 1407 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1408 pw->pw_name); 1409 reply(530, "Permission denied."); 1410 pw = NULL; 1411 return; 1412 } 1413 if (!auth_timeok(lc, time(NULL))) { 1414 reply(530, "Login not available right now."); 1415 pw = NULL; 1416 return; 1417 } 1418 } 1419 setusercontext(lc, pw, 0, 1420 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1421 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1422#else 1423 setlogin(pw->pw_name); 1424 (void) initgroups(pw->pw_name, pw->pw_gid); 1425#endif 1426 1427#ifdef USE_PAM 1428 if (pamh) { 1429 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1430 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1431 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1432 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1433 } 1434 } 1435#endif 1436 1437 /* open wtmp before chroot */ 1438 if (dowtmp) 1439 ftpd_logwtmp(ttyline, pw->pw_name, 1440 (struct sockaddr *)&his_addr); 1441 logged_in = 1; 1442 1443 if (guest && stats && statfd < 0) 1444#ifdef VIRTUAL_HOSTING 1445 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1446#else 1447 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1448#endif 1449 if (statfd < 0) 1450 stats = 0; 1451 1452 dochroot = 1453 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1454#ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1455 || login_getcapbool(lc, "ftp-chroot", 0) 1456#endif 1457 ; 1458 chrootdir = NULL; 1459 /* 1460 * For a chrooted local user, 1461 * a) see whether ftpchroot(5) specifies a chroot directory, 1462 * b) extract the directory pathname from the line, 1463 * c) expand it to the absolute pathname if necessary. 1464 */ 1465 if (dochroot && residue && 1466 (chrootdir = strtok(residue, " \t")) != NULL) { 1467 if (chrootdir[0] != '/') 1468 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1469 else 1470 chrootdir = strdup(chrootdir); /* so it can be freed */ 1471 if (chrootdir == NULL) 1472 fatalerror("Ran out of memory."); 1473 } 1474 if (guest || dochroot) { 1475 /* 1476 * If no chroot directory set yet, use the login directory. 1477 * Copy it so it can be modified while pw->pw_dir stays intact. 1478 */ 1479 if (chrootdir == NULL && 1480 (chrootdir = strdup(pw->pw_dir)) == NULL) 1481 fatalerror("Ran out of memory."); 1482 /* 1483 * Check for the "/chroot/./home" syntax, 1484 * separate the chroot and home directory pathnames. 1485 */ 1486 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1487 *(homedir++) = '\0'; /* wipe '/' */ 1488 homedir++; /* skip '.' */ 1489 /* so chrootdir can be freed later */ 1490 if ((homedir = strdup(homedir)) == NULL) 1491 fatalerror("Ran out of memory."); 1492 } else { 1493 /* 1494 * We MUST do a chdir() after the chroot. Otherwise 1495 * the old current directory will be accessible as "." 1496 * outside the new root! 1497 */ 1498 homedir = "/"; 1499 } 1500 /* 1501 * Finally, do chroot() 1502 */ 1503 if (chroot(chrootdir) < 0) { 1504 reply(550, "Can't change root."); 1505 goto bad; 1506 } 1507 } else /* real user w/o chroot */ 1508 homedir = pw->pw_dir; 1509 /* 1510 * Set euid *before* doing chdir() so 1511 * a) the user won't be carried to a directory that he couldn't reach 1512 * on his own due to no permission to upper path components, 1513 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1514 * (uid 0 has no root power over NFS if not mapped explicitly.) 1515 */ 1516 if (seteuid(pw->pw_uid) < 0) { 1517 reply(550, "Can't set uid."); 1518 goto bad; 1519 } 1520 if (chdir(homedir) < 0) { 1521 if (guest || dochroot) { 1522 reply(550, "Can't change to base directory."); 1523 goto bad; 1524 } else { 1525 if (chdir("/") < 0) { 1526 reply(550, "Root is inaccessible."); 1527 goto bad; 1528 } 1529 lreply(230, "No directory! Logging in with home=/."); 1530 } 1531 } 1532 1533 /* 1534 * Display a login message, if it exists. 1535 * N.B. reply(230,) must follow the message. 1536 */ 1537#ifdef VIRTUAL_HOSTING 1538 fd = fopen(thishost->loginmsg, "r"); 1539#else 1540 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1541#endif 1542 if (fd != NULL) { 1543 char *cp, line[LINE_MAX]; 1544 1545 while (fgets(line, sizeof(line), fd) != NULL) { 1546 if ((cp = strchr(line, '\n')) != NULL) 1547 *cp = '\0'; 1548 lreply(230, "%s", line); 1549 } 1550 (void) fflush(stdout); 1551 (void) fclose(fd); 1552 } 1553 if (guest) { 1554 if (ident != NULL) 1555 free(ident); 1556 ident = strdup(passwd); 1557 if (ident == NULL) 1558 fatalerror("Ran out of memory."); 1559 1560 reply(230, "Guest login ok, access restrictions apply."); 1561#ifdef SETPROCTITLE 1562#ifdef VIRTUAL_HOSTING 1563 if (thishost != firsthost) 1564 snprintf(proctitle, sizeof(proctitle), 1565 "%s: anonymous(%s)/%s", remotehost, hostname, 1566 passwd); 1567 else 1568#endif 1569 snprintf(proctitle, sizeof(proctitle), 1570 "%s: anonymous/%s", remotehost, passwd); 1571 setproctitle("%s", proctitle); 1572#endif /* SETPROCTITLE */ 1573 if (logging) 1574 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1575 remotehost, passwd); 1576 } else { 1577 if (dochroot) 1578 reply(230, "User %s logged in, " 1579 "access restrictions apply.", pw->pw_name); 1580 else 1581 reply(230, "User %s logged in.", pw->pw_name); 1582 1583#ifdef SETPROCTITLE 1584 snprintf(proctitle, sizeof(proctitle), 1585 "%s: user/%s", remotehost, pw->pw_name); 1586 setproctitle("%s", proctitle); 1587#endif /* SETPROCTITLE */ 1588 if (logging) 1589 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1590 remotehost, pw->pw_name); 1591 } 1592#ifdef LOGIN_CAP 1593 login_close(lc); 1594#endif 1595 if (chrootdir) 1596 free(chrootdir); 1597 if (residue) 1598 free(residue); 1599 return; 1600bad: 1601 /* Forget all about it... */ 1602#ifdef LOGIN_CAP 1603 login_close(lc); 1604#endif 1605 if (chrootdir) 1606 free(chrootdir); 1607 if (residue) 1608 free(residue); 1609 end_login(); 1610} 1611 1612void 1613retrieve(char *cmd, char *name) 1614{ 1615 FILE *fin, *dout; 1616 struct stat st; 1617 int (*closefunc)(FILE *); 1618 time_t start; 1619 1620 if (cmd == 0) { 1621 fin = fopen(name, "r"), closefunc = fclose; 1622 st.st_size = 0; 1623 } else { 1624 char line[BUFSIZ]; 1625 1626 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1627 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1628 st.st_size = -1; 1629 st.st_blksize = BUFSIZ; 1630 } 1631 if (fin == NULL) { 1632 if (errno != 0) { 1633 perror_reply(550, name); 1634 if (cmd == 0) { 1635 LOGCMD("get", name); 1636 } 1637 } 1638 return; 1639 } 1640 byte_count = -1; 1641 if (cmd == 0) { 1642 if (fstat(fileno(fin), &st) < 0) { 1643 perror_reply(550, name); 1644 goto done; 1645 } 1646 if (!S_ISREG(st.st_mode)) { 1647 /* 1648 * Never sending a raw directory is a workaround 1649 * for buggy clients that will attempt to RETR 1650 * a directory before listing it, e.g., Mozilla. 1651 * Preventing a guest from getting irregular files 1652 * is a simple security measure. 1653 */ 1654 if (S_ISDIR(st.st_mode) || guest) { 1655 reply(550, "%s: not a plain file.", name); 1656 goto done; 1657 } 1658 st.st_size = -1; 1659 /* st.st_blksize is set for all descriptor types */ 1660 } 1661 } 1662 if (restart_point) { 1663 if (type == TYPE_A) { 1664 off_t i, n; 1665 int c; 1666 1667 n = restart_point; 1668 i = 0; 1669 while (i++ < n) { 1670 if ((c=getc(fin)) == EOF) { 1671 perror_reply(550, name); 1672 goto done; 1673 } 1674 if (c == '\n') 1675 i++; 1676 } 1677 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1678 perror_reply(550, name); 1679 goto done; 1680 } 1681 } 1682 dout = dataconn(name, st.st_size, "w"); 1683 if (dout == NULL) 1684 goto done; 1685 time(&start); 1686 send_data(fin, dout, st.st_blksize, st.st_size, 1687 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1688 if (cmd == 0 && guest && stats && byte_count > 0) 1689 logxfer(name, byte_count, start); 1690 (void) fclose(dout); 1691 data = -1; 1692 pdata = -1; 1693done: 1694 if (cmd == 0) 1695 LOGBYTES("get", name, byte_count); 1696 (*closefunc)(fin); 1697} 1698 1699void 1700store(char *name, char *mode, int unique) 1701{ 1702 int fd; 1703 FILE *fout, *din; 1704 int (*closefunc)(FILE *); 1705 1706 if (*mode == 'a') { /* APPE */ 1707 if (unique) { 1708 /* Programming error */ 1709 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1710 unique = 0; 1711 } 1712 if (guest && noguestmod) { 1713 reply(550, "Appending to existing file denied."); 1714 goto err; 1715 } 1716 restart_point = 0; /* not affected by preceding REST */ 1717 } 1718 if (unique) /* STOU overrides REST */ 1719 restart_point = 0; 1720 if (guest && noguestmod) { 1721 if (restart_point) { /* guest STOR w/REST */ 1722 reply(550, "Modifying existing file denied."); 1723 goto err; 1724 } else /* treat guest STOR as STOU */ 1725 unique = 1; 1726 } 1727 1728 if (restart_point) 1729 mode = "r+"; /* so ASCII manual seek can work */ 1730 if (unique) { 1731 if ((fd = guniquefd(name, &name)) < 0) 1732 goto err; 1733 fout = fdopen(fd, mode); 1734 } else 1735 fout = fopen(name, mode); 1736 closefunc = fclose; 1737 if (fout == NULL) { 1738 perror_reply(553, name); 1739 goto err; 1740 } 1741 byte_count = -1; 1742 if (restart_point) { 1743 if (type == TYPE_A) { 1744 off_t i, n; 1745 int c; 1746 1747 n = restart_point; 1748 i = 0; 1749 while (i++ < n) { 1750 if ((c=getc(fout)) == EOF) { 1751 perror_reply(550, name); 1752 goto done; 1753 } 1754 if (c == '\n') 1755 i++; 1756 } 1757 /* 1758 * We must do this seek to "current" position 1759 * because we are changing from reading to 1760 * writing. 1761 */ 1762 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1763 perror_reply(550, name); 1764 goto done; 1765 } 1766 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1767 perror_reply(550, name); 1768 goto done; 1769 } 1770 } 1771 din = dataconn(name, -1, "r"); 1772 if (din == NULL) 1773 goto done; 1774 if (receive_data(din, fout) == 0) { 1775 if (unique) 1776 reply(226, "Transfer complete (unique file name:%s).", 1777 name); 1778 else 1779 reply(226, "Transfer complete."); 1780 } 1781 (void) fclose(din); 1782 data = -1; 1783 pdata = -1; 1784done: 1785 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1786 (*closefunc)(fout); 1787 return; 1788err: 1789 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1790 return; 1791} 1792 1793static FILE * 1794getdatasock(char *mode) 1795{ 1796 int on = 1, s, t, tries; 1797 1798 if (data >= 0) 1799 return (fdopen(data, mode)); 1800 1801 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1802 if (s < 0) 1803 goto bad; 1804 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1805 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1806 /* anchor socket to avoid multi-homing problems */ 1807 data_source = ctrl_addr; 1808 data_source.su_port = htons(dataport); 1809 (void) seteuid(0); 1810 for (tries = 1; ; tries++) { 1811 /* 1812 * We should loop here since it's possible that 1813 * another ftpd instance has passed this point and is 1814 * trying to open a data connection in active mode now. 1815 * Until the other connection is opened, we'll be getting 1816 * EADDRINUSE because no SOCK_STREAM sockets in the system 1817 * can share both local and remote addresses, localIP:20 1818 * and *:* in this case. 1819 */ 1820 if (bind(s, (struct sockaddr *)&data_source, 1821 data_source.su_len) >= 0) 1822 break; 1823 if (errno != EADDRINUSE || tries > 10) 1824 goto bad; 1825 sleep(tries); 1826 } 1827 (void) seteuid(pw->pw_uid); 1828#ifdef IP_TOS 1829 if (data_source.su_family == AF_INET) 1830 { 1831 on = IPTOS_THROUGHPUT; 1832 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1833 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1834 } 1835#endif 1836#ifdef TCP_NOPUSH 1837 /* 1838 * Turn off push flag to keep sender TCP from sending short packets 1839 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1840 * to set the send buffer size as well, but that may not be desirable 1841 * in heavy-load situations. 1842 */ 1843 on = 1; 1844 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1845 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1846#endif 1847#ifdef SO_SNDBUF 1848 on = 65536; 1849 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1850 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1851#endif 1852 1853 return (fdopen(s, mode)); 1854bad: 1855 /* Return the real value of errno (close may change it) */ 1856 t = errno; 1857 (void) seteuid(pw->pw_uid); 1858 (void) close(s); 1859 errno = t; 1860 return (NULL); 1861} 1862 1863static FILE * 1864dataconn(char *name, off_t size, char *mode) 1865{ 1866 char sizebuf[32]; 1867 FILE *file; 1868 int retry = 0, tos, conerrno; 1869 1870 file_size = size; 1871 byte_count = 0; 1872 if (size != -1) 1873 (void) snprintf(sizebuf, sizeof(sizebuf), 1874 " (%jd bytes)", (intmax_t)size); 1875 else 1876 *sizebuf = '\0'; 1877 if (pdata >= 0) { 1878 union sockunion from; 1879 int flags; 1880 int s, fromlen = ctrl_addr.su_len; 1881 struct timeval timeout; 1882 fd_set set; 1883 1884 FD_ZERO(&set); 1885 FD_SET(pdata, &set); 1886 1887 timeout.tv_usec = 0; 1888 timeout.tv_sec = 120; 1889 1890 /* 1891 * Granted a socket is in the blocking I/O mode, 1892 * accept() will block after a successful select() 1893 * if the selected connection dies in between. 1894 * Therefore set the non-blocking I/O flag here. 1895 */ 1896 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1897 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1898 goto pdata_err; 1899 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1900 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1901 goto pdata_err; 1902 (void) close(pdata); 1903 pdata = s; 1904 /* 1905 * Unset the inherited non-blocking I/O flag 1906 * on the child socket so stdio can work on it. 1907 */ 1908 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1909 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1910 goto pdata_err; 1911#ifdef IP_TOS 1912 if (from.su_family == AF_INET) 1913 { 1914 tos = IPTOS_THROUGHPUT; 1915 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1916 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1917 } 1918#endif 1919 reply(150, "Opening %s mode data connection for '%s'%s.", 1920 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1921 return (fdopen(pdata, mode)); 1922pdata_err: 1923 reply(425, "Can't open data connection."); 1924 (void) close(pdata); 1925 pdata = -1; 1926 return (NULL); 1927 } 1928 if (data >= 0) { 1929 reply(125, "Using existing data connection for '%s'%s.", 1930 name, sizebuf); 1931 usedefault = 1; 1932 return (fdopen(data, mode)); 1933 } 1934 if (usedefault) 1935 data_dest = his_addr; 1936 usedefault = 1; 1937 do { 1938 file = getdatasock(mode); 1939 if (file == NULL) { 1940 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1941 getnameinfo((struct sockaddr *)&data_source, 1942 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1943 portbuf, sizeof(portbuf), 1944 NI_NUMERICHOST|NI_NUMERICSERV); 1945 reply(425, "Can't create data socket (%s,%s): %s.", 1946 hostbuf, portbuf, strerror(errno)); 1947 return (NULL); 1948 } 1949 data = fileno(file); 1950 conerrno = 0; 1951 if (connect(data, (struct sockaddr *)&data_dest, 1952 data_dest.su_len) == 0) 1953 break; 1954 conerrno = errno; 1955 (void) fclose(file); 1956 data = -1; 1957 if (conerrno == EADDRINUSE) { 1958 sleep(swaitint); 1959 retry += swaitint; 1960 } else { 1961 break; 1962 } 1963 } while (retry <= swaitmax); 1964 if (conerrno != 0) { 1965 reply(425, "Can't build data connection: %s.", 1966 strerror(conerrno)); 1967 return (NULL); 1968 } 1969 reply(150, "Opening %s mode data connection for '%s'%s.", 1970 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1971 return (file); 1972} 1973 1974/* 1975 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1976 * encapsulation of the data subject to Mode, Structure, and Type. 1977 * 1978 * NB: Form isn't handled. 1979 */ 1980static int 1981send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 1982{ 1983 int c, cp, filefd, netfd; 1984 char *buf; 1985 off_t cnt; 1986 1987 transflag++; 1988 switch (type) { 1989 1990 case TYPE_A: 1991 cp = '\0'; 1992 while ((c = getc(instr)) != EOF) { 1993 if (recvurg) 1994 goto got_oob; 1995 byte_count++; 1996 if (c == '\n' && cp != '\r') { 1997 if (ferror(outstr)) 1998 goto data_err; 1999 (void) putc('\r', outstr); 2000 } 2001 (void) putc(c, outstr); 2002 cp = c; 2003 } 2004 if (recvurg) 2005 goto got_oob; 2006 fflush(outstr); 2007 transflag = 0; 2008 if (ferror(instr)) 2009 goto file_err; 2010 if (ferror(outstr)) 2011 goto data_err; 2012 reply(226, "Transfer complete."); 2013 return (0); 2014 2015 case TYPE_I: 2016 case TYPE_L: 2017 /* 2018 * isreg is only set if we are not doing restart and we 2019 * are sending a regular file 2020 */ 2021 netfd = fileno(outstr); 2022 filefd = fileno(instr); 2023 2024 if (isreg) { 2025 2026 char *msg = "Transfer complete."; 2027 off_t offset; 2028 int err; 2029 2030 cnt = offset = 0; 2031 2032 while (filesize > 0) { 2033 err = sendfile(filefd, netfd, offset, 0, 2034 NULL, &cnt, 0); 2035 /* 2036 * Calculate byte_count before OOB processing. 2037 * It can be used in myoob() later. 2038 */ 2039 byte_count += cnt; 2040 if (recvurg) 2041 goto got_oob; 2042 offset += cnt; 2043 filesize -= cnt; 2044 2045 if (err == -1) { 2046 if (cnt == 0 && offset == 0) 2047 goto oldway; 2048 2049 goto data_err; 2050 } 2051 2052 /* 2053 * We hit the EOF prematurely. 2054 * Perhaps the file was externally truncated. 2055 */ 2056 if (cnt == 0) { 2057 msg = "Transfer finished due to " 2058 "premature end of file."; 2059 break; 2060 } 2061 } 2062 2063 transflag = 0; 2064 reply(226, msg); 2065 return (0); 2066 } 2067 2068oldway: 2069 if ((buf = malloc(blksize)) == NULL) { 2070 transflag = 0; 2071 reply(451, "Ran out of memory."); 2072 return (-1); 2073 } 2074 2075 while ((cnt = read(filefd, buf, blksize)) > 0 && 2076 write(netfd, buf, cnt) == cnt) 2077 byte_count += cnt; 2078 transflag = 0; 2079 (void)free(buf); 2080 if (cnt != 0) { 2081 if (cnt < 0) 2082 goto file_err; 2083 goto data_err; 2084 } 2085 reply(226, "Transfer complete."); 2086 return (0); 2087 default: 2088 transflag = 0; 2089 reply(550, "Unimplemented TYPE %d in send_data.", type); 2090 return (-1); 2091 } 2092 2093data_err: 2094 transflag = 0; 2095 perror_reply(426, "Data connection"); 2096 return (-1); 2097 2098file_err: 2099 transflag = 0; 2100 perror_reply(551, "Error on input file"); 2101 return (-1); 2102 2103got_oob: 2104 myoob(); 2105 recvurg = 0; 2106 transflag = 0; 2107 return (-1); 2108} 2109 2110/* 2111 * Transfer data from peer to "outstr" using the appropriate encapulation of 2112 * the data subject to Mode, Structure, and Type. 2113 * 2114 * N.B.: Form isn't handled. 2115 */ 2116static int 2117receive_data(FILE *instr, FILE *outstr) 2118{ 2119 int c; 2120 int cnt, bare_lfs; 2121 char buf[BUFSIZ]; 2122 2123 transflag++; 2124 bare_lfs = 0; 2125 2126 switch (type) { 2127 2128 case TYPE_I: 2129 case TYPE_L: 2130 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 2131 if (recvurg) 2132 goto got_oob; 2133 if (write(fileno(outstr), buf, cnt) != cnt) 2134 goto file_err; 2135 byte_count += cnt; 2136 } 2137 if (recvurg) 2138 goto got_oob; 2139 if (cnt < 0) 2140 goto data_err; 2141 transflag = 0; 2142 return (0); 2143 2144 case TYPE_E: 2145 reply(553, "TYPE E not implemented."); 2146 transflag = 0; 2147 return (-1); 2148 2149 case TYPE_A: 2150 while ((c = getc(instr)) != EOF) { 2151 if (recvurg) 2152 goto got_oob; 2153 byte_count++; 2154 if (c == '\n') 2155 bare_lfs++; 2156 while (c == '\r') { 2157 if (ferror(outstr)) 2158 goto data_err; 2159 if ((c = getc(instr)) != '\n') { 2160 (void) putc ('\r', outstr); 2161 if (c == '\0' || c == EOF) 2162 goto contin2; 2163 } 2164 } 2165 (void) putc(c, outstr); 2166 contin2: ; 2167 } 2168 if (recvurg) 2169 goto got_oob; 2170 fflush(outstr); 2171 if (ferror(instr)) 2172 goto data_err; 2173 if (ferror(outstr)) 2174 goto file_err; 2175 transflag = 0; 2176 if (bare_lfs) { 2177 lreply(226, 2178 "WARNING! %d bare linefeeds received in ASCII mode.", 2179 bare_lfs); 2180 (void)printf(" File may not have transferred correctly.\r\n"); 2181 } 2182 return (0); 2183 default: 2184 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2185 transflag = 0; 2186 return (-1); 2187 } 2188 2189data_err: 2190 transflag = 0; 2191 perror_reply(426, "Data connection"); 2192 return (-1); 2193 2194file_err: 2195 transflag = 0; 2196 perror_reply(452, "Error writing to file"); 2197 return (-1); 2198 2199got_oob: 2200 myoob(); 2201 recvurg = 0; 2202 transflag = 0; 2203 return (-1); 2204} 2205 2206void 2207statfilecmd(char *filename) 2208{ 2209 FILE *fin; 2210 int atstart; 2211 int c, code; 2212 char line[LINE_MAX]; 2213 struct stat st; 2214 2215 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2216 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2217 fin = ftpd_popen(line, "r"); 2218 lreply(code, "Status of %s:", filename); 2219 atstart = 1; 2220 while ((c = getc(fin)) != EOF) { 2221 if (c == '\n') { 2222 if (ferror(stdout)){ 2223 perror_reply(421, "Control connection"); 2224 (void) ftpd_pclose(fin); 2225 dologout(1); 2226 /* NOTREACHED */ 2227 } 2228 if (ferror(fin)) { 2229 perror_reply(551, filename); 2230 (void) ftpd_pclose(fin); 2231 return; 2232 } 2233 (void) putc('\r', stdout); 2234 } 2235 /* 2236 * RFC 959 says neutral text should be prepended before 2237 * a leading 3-digit number followed by whitespace, but 2238 * many ftp clients can be confused by any leading digits, 2239 * as a matter of fact. 2240 */ 2241 if (atstart && isdigit(c)) 2242 (void) putc(' ', stdout); 2243 (void) putc(c, stdout); 2244 atstart = (c == '\n'); 2245 } 2246 (void) ftpd_pclose(fin); 2247 reply(code, "End of status."); 2248} 2249 2250void 2251statcmd(void) 2252{ 2253 union sockunion *su; 2254 u_char *a, *p; 2255 char hname[NI_MAXHOST]; 2256 int ispassive; 2257 2258 if (hostinfo) { 2259 lreply(211, "%s FTP server status:", hostname); 2260 printf(" %s\r\n", version); 2261 } else 2262 lreply(211, "FTP server status:"); 2263 printf(" Connected to %s", remotehost); 2264 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2265 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2266 if (strcmp(hname, remotehost) != 0) 2267 printf(" (%s)", hname); 2268 } 2269 printf("\r\n"); 2270 if (logged_in) { 2271 if (guest) 2272 printf(" Logged in anonymously\r\n"); 2273 else 2274 printf(" Logged in as %s\r\n", pw->pw_name); 2275 } else if (askpasswd) 2276 printf(" Waiting for password\r\n"); 2277 else 2278 printf(" Waiting for user name\r\n"); 2279 printf(" TYPE: %s", typenames[type]); 2280 if (type == TYPE_A || type == TYPE_E) 2281 printf(", FORM: %s", formnames[form]); 2282 if (type == TYPE_L) 2283#if CHAR_BIT == 8 2284 printf(" %d", CHAR_BIT); 2285#else 2286 printf(" %d", bytesize); /* need definition! */ 2287#endif 2288 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2289 strunames[stru], modenames[mode]); 2290 if (data != -1) 2291 printf(" Data connection open\r\n"); 2292 else if (pdata != -1) { 2293 ispassive = 1; 2294 su = &pasv_addr; 2295 goto printaddr; 2296 } else if (usedefault == 0) { 2297 ispassive = 0; 2298 su = &data_dest; 2299printaddr: 2300#define UC(b) (((int) b) & 0xff) 2301 if (epsvall) { 2302 printf(" EPSV only mode (EPSV ALL)\r\n"); 2303 goto epsvonly; 2304 } 2305 2306 /* PORT/PASV */ 2307 if (su->su_family == AF_INET) { 2308 a = (u_char *) &su->su_sin.sin_addr; 2309 p = (u_char *) &su->su_sin.sin_port; 2310 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2311 ispassive ? "PASV" : "PORT", 2312 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2313 UC(p[0]), UC(p[1])); 2314 } 2315 2316 /* LPRT/LPSV */ 2317 { 2318 int alen, af, i; 2319 2320 switch (su->su_family) { 2321 case AF_INET: 2322 a = (u_char *) &su->su_sin.sin_addr; 2323 p = (u_char *) &su->su_sin.sin_port; 2324 alen = sizeof(su->su_sin.sin_addr); 2325 af = 4; 2326 break; 2327 case AF_INET6: 2328 a = (u_char *) &su->su_sin6.sin6_addr; 2329 p = (u_char *) &su->su_sin6.sin6_port; 2330 alen = sizeof(su->su_sin6.sin6_addr); 2331 af = 6; 2332 break; 2333 default: 2334 af = 0; 2335 break; 2336 } 2337 if (af) { 2338 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2339 af, alen); 2340 for (i = 0; i < alen; i++) 2341 printf("%d,", UC(a[i])); 2342 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2343 } 2344 } 2345 2346epsvonly:; 2347 /* EPRT/EPSV */ 2348 { 2349 int af; 2350 2351 switch (su->su_family) { 2352 case AF_INET: 2353 af = 1; 2354 break; 2355 case AF_INET6: 2356 af = 2; 2357 break; 2358 default: 2359 af = 0; 2360 break; 2361 } 2362 if (af) { 2363 union sockunion tmp; 2364 2365 tmp = *su; 2366 if (tmp.su_family == AF_INET6) 2367 tmp.su_sin6.sin6_scope_id = 0; 2368 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2369 hname, sizeof(hname) - 1, NULL, 0, 2370 NI_NUMERICHOST)) { 2371 printf(" %s |%d|%s|%d|\r\n", 2372 ispassive ? "EPSV" : "EPRT", 2373 af, hname, htons(tmp.su_port)); 2374 } 2375 } 2376 } 2377#undef UC 2378 } else 2379 printf(" No data connection\r\n"); 2380 reply(211, "End of status."); 2381} 2382 2383void 2384fatalerror(char *s) 2385{ 2386 2387 reply(451, "Error in server: %s", s); 2388 reply(221, "Closing connection due to server error."); 2389 dologout(0); 2390 /* NOTREACHED */ 2391} 2392 2393void 2394reply(int n, const char *fmt, ...) 2395{ 2396 va_list ap; 2397 2398 (void)printf("%d ", n); 2399 va_start(ap, fmt); 2400 (void)vprintf(fmt, ap); 2401 va_end(ap); 2402 (void)printf("\r\n"); 2403 (void)fflush(stdout); 2404 if (ftpdebug) { 2405 syslog(LOG_DEBUG, "<--- %d ", n); 2406 va_start(ap, fmt); 2407 vsyslog(LOG_DEBUG, fmt, ap); 2408 va_end(ap); 2409 } 2410} 2411 2412void 2413lreply(int n, const char *fmt, ...) 2414{ 2415 va_list ap; 2416 2417 (void)printf("%d- ", n); 2418 va_start(ap, fmt); 2419 (void)vprintf(fmt, ap); 2420 va_end(ap); 2421 (void)printf("\r\n"); 2422 (void)fflush(stdout); 2423 if (ftpdebug) { 2424 syslog(LOG_DEBUG, "<--- %d- ", n); 2425 va_start(ap, fmt); 2426 vsyslog(LOG_DEBUG, fmt, ap); 2427 va_end(ap); 2428 } 2429} 2430 2431static void 2432ack(char *s) 2433{ 2434 2435 reply(250, "%s command successful.", s); 2436} 2437 2438void 2439nack(char *s) 2440{ 2441 2442 reply(502, "%s command not implemented.", s); 2443} 2444 2445/* ARGSUSED */ 2446void 2447yyerror(char *s) 2448{ 2449 char *cp; 2450 2451 if ((cp = strchr(cbuf,'\n'))) 2452 *cp = '\0'; 2453 reply(500, "%s: command not understood.", cbuf); 2454} 2455 2456void 2457delete(char *name) 2458{ 2459 struct stat st; 2460 2461 LOGCMD("delete", name); 2462 if (lstat(name, &st) < 0) { 2463 perror_reply(550, name); 2464 return; 2465 } 2466 if (S_ISDIR(st.st_mode)) { 2467 if (rmdir(name) < 0) { 2468 perror_reply(550, name); 2469 return; 2470 } 2471 goto done; 2472 } 2473 if (guest && noguestmod) { 2474 reply(550, "Operation not permitted."); 2475 return; 2476 } 2477 if (unlink(name) < 0) { 2478 perror_reply(550, name); 2479 return; 2480 } 2481done: 2482 ack("DELE"); 2483} 2484 2485void 2486cwd(char *path) 2487{ 2488 2489 if (chdir(path) < 0) 2490 perror_reply(550, path); 2491 else 2492 ack("CWD"); 2493} 2494 2495void 2496makedir(char *name) 2497{ 2498 char *s; 2499 2500 LOGCMD("mkdir", name); 2501 if (guest && noguestmkd) 2502 reply(550, "Operation not permitted."); 2503 else if (mkdir(name, 0777) < 0) 2504 perror_reply(550, name); 2505 else { 2506 if ((s = doublequote(name)) == NULL) 2507 fatalerror("Ran out of memory."); 2508 reply(257, "\"%s\" directory created.", s); 2509 free(s); 2510 } 2511} 2512 2513void 2514removedir(char *name) 2515{ 2516 2517 LOGCMD("rmdir", name); 2518 if (rmdir(name) < 0) 2519 perror_reply(550, name); 2520 else 2521 ack("RMD"); 2522} 2523 2524void 2525pwd(void) 2526{ 2527 char *s, path[MAXPATHLEN + 1]; 2528 2529 if (getcwd(path, sizeof(path)) == NULL) 2530 perror_reply(550, "Get current directory"); 2531 else { 2532 if ((s = doublequote(path)) == NULL) 2533 fatalerror("Ran out of memory."); 2534 reply(257, "\"%s\" is current directory.", s); 2535 free(s); 2536 } 2537} 2538 2539char * 2540renamefrom(char *name) 2541{ 2542 struct stat st; 2543 2544 if (guest && noguestmod) { 2545 reply(550, "Operation not permitted."); 2546 return (NULL); 2547 } 2548 if (lstat(name, &st) < 0) { 2549 perror_reply(550, name); 2550 return (NULL); 2551 } 2552 reply(350, "File exists, ready for destination name."); 2553 return (name); 2554} 2555 2556void 2557renamecmd(char *from, char *to) 2558{ 2559 struct stat st; 2560 2561 LOGCMD2("rename", from, to); 2562 2563 if (guest && (stat(to, &st) == 0)) { 2564 reply(550, "%s: permission denied.", to); 2565 return; 2566 } 2567 2568 if (rename(from, to) < 0) 2569 perror_reply(550, "rename"); 2570 else 2571 ack("RNTO"); 2572} 2573 2574static void 2575dolog(struct sockaddr *who) 2576{ 2577 int error; 2578 2579 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2580 2581#ifdef SETPROCTITLE 2582#ifdef VIRTUAL_HOSTING 2583 if (thishost != firsthost) 2584 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2585 remotehost, hostname); 2586 else 2587#endif 2588 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2589 remotehost); 2590 setproctitle("%s", proctitle); 2591#endif /* SETPROCTITLE */ 2592 2593 if (logging) { 2594#ifdef VIRTUAL_HOSTING 2595 if (thishost != firsthost) 2596 syslog(LOG_INFO, "connection from %s (to %s)", 2597 remotehost, hostname); 2598 else 2599#endif 2600 { 2601 char who_name[MAXHOSTNAMELEN]; 2602 2603 error = getnameinfo(who, who->sa_len, 2604 who_name, sizeof(who_name) - 1, 2605 NULL, 0, NI_NUMERICHOST); 2606 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2607 error == 0 ? who_name : ""); 2608 } 2609 } 2610} 2611 2612/* 2613 * Record logout in wtmp file 2614 * and exit with supplied status. 2615 */ 2616void 2617dologout(int status) 2618{ 2619 /* 2620 * Prevent reception of SIGURG from resulting in a resumption 2621 * back to the main program loop. 2622 */ 2623 transflag = 0; 2624 2625 if (logged_in && dowtmp) { 2626 (void) seteuid(0); 2627 ftpd_logwtmp(ttyline, "", NULL); 2628 } 2629 /* beware of flushing buffers after a SIGPIPE */ 2630 _exit(status); 2631} 2632 2633static void 2634sigurg(int signo) 2635{ 2636 2637 recvurg = 1; 2638} 2639 2640static void 2641myoob(void) 2642{ 2643 char *cp; 2644 2645 /* only process if transfer occurring */ 2646 if (!transflag) 2647 return; 2648 cp = tmpline; 2649 if (getline(cp, 7, stdin) == NULL) { 2650 reply(221, "You could at least say goodbye."); 2651 dologout(0); 2652 } 2653 upper(cp); 2654 if (strcmp(cp, "ABOR\r\n") == 0) { 2655 tmpline[0] = '\0'; 2656 reply(426, "Transfer aborted. Data connection closed."); 2657 reply(226, "Abort successful."); 2658 } 2659 if (strcmp(cp, "STAT\r\n") == 0) { 2660 tmpline[0] = '\0'; 2661 if (file_size != -1) 2662 reply(213, "Status: %jd of %jd bytes transferred.", 2663 (intmax_t)byte_count, (intmax_t)file_size); 2664 else 2665 reply(213, "Status: %jd bytes transferred.", 2666 (intmax_t)byte_count); 2667 } 2668} 2669 2670/* 2671 * Note: a response of 425 is not mentioned as a possible response to 2672 * the PASV command in RFC959. However, it has been blessed as 2673 * a legitimate response by Jon Postel in a telephone conversation 2674 * with Rick Adams on 25 Jan 89. 2675 */ 2676void 2677passive(void) 2678{ 2679 int len, on; 2680 char *p, *a; 2681 2682 if (pdata >= 0) /* close old port if one set */ 2683 close(pdata); 2684 2685 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2686 if (pdata < 0) { 2687 perror_reply(425, "Can't open passive connection"); 2688 return; 2689 } 2690 on = 1; 2691 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2692 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2693 2694 (void) seteuid(0); 2695 2696#ifdef IP_PORTRANGE 2697 if (ctrl_addr.su_family == AF_INET) { 2698 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2699 : IP_PORTRANGE_DEFAULT; 2700 2701 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2702 &on, sizeof(on)) < 0) 2703 goto pasv_error; 2704 } 2705#endif 2706#ifdef IPV6_PORTRANGE 2707 if (ctrl_addr.su_family == AF_INET6) { 2708 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2709 : IPV6_PORTRANGE_DEFAULT; 2710 2711 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2712 &on, sizeof(on)) < 0) 2713 goto pasv_error; 2714 } 2715#endif 2716 2717 pasv_addr = ctrl_addr; 2718 pasv_addr.su_port = 0; 2719 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2720 goto pasv_error; 2721 2722 (void) seteuid(pw->pw_uid); 2723 2724 len = sizeof(pasv_addr); 2725 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2726 goto pasv_error; 2727 if (listen(pdata, 1) < 0) 2728 goto pasv_error; 2729 if (pasv_addr.su_family == AF_INET) 2730 a = (char *) &pasv_addr.su_sin.sin_addr; 2731 else if (pasv_addr.su_family == AF_INET6 && 2732 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2733 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2734 else 2735 goto pasv_error; 2736 2737 p = (char *) &pasv_addr.su_port; 2738 2739#define UC(b) (((int) b) & 0xff) 2740 2741 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2742 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2743 return; 2744 2745pasv_error: 2746 (void) seteuid(pw->pw_uid); 2747 (void) close(pdata); 2748 pdata = -1; 2749 perror_reply(425, "Can't open passive connection"); 2750 return; 2751} 2752 2753/* 2754 * Long Passive defined in RFC 1639. 2755 * 228 Entering Long Passive Mode 2756 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2757 */ 2758 2759void 2760long_passive(char *cmd, int pf) 2761{ 2762 int len, on; 2763 char *p, *a; 2764 2765 if (pdata >= 0) /* close old port if one set */ 2766 close(pdata); 2767 2768 if (pf != PF_UNSPEC) { 2769 if (ctrl_addr.su_family != pf) { 2770 switch (ctrl_addr.su_family) { 2771 case AF_INET: 2772 pf = 1; 2773 break; 2774 case AF_INET6: 2775 pf = 2; 2776 break; 2777 default: 2778 pf = 0; 2779 break; 2780 } 2781 /* 2782 * XXX 2783 * only EPRT/EPSV ready clients will understand this 2784 */ 2785 if (strcmp(cmd, "EPSV") == 0 && pf) { 2786 reply(522, "Network protocol mismatch, " 2787 "use (%d)", pf); 2788 } else 2789 reply(501, "Network protocol mismatch."); /*XXX*/ 2790 2791 return; 2792 } 2793 } 2794 2795 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2796 if (pdata < 0) { 2797 perror_reply(425, "Can't open passive connection"); 2798 return; 2799 } 2800 on = 1; 2801 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2802 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2803 2804 (void) seteuid(0); 2805 2806 pasv_addr = ctrl_addr; 2807 pasv_addr.su_port = 0; 2808 len = pasv_addr.su_len; 2809 2810#ifdef IP_PORTRANGE 2811 if (ctrl_addr.su_family == AF_INET) { 2812 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2813 : IP_PORTRANGE_DEFAULT; 2814 2815 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2816 &on, sizeof(on)) < 0) 2817 goto pasv_error; 2818 } 2819#endif 2820#ifdef IPV6_PORTRANGE 2821 if (ctrl_addr.su_family == AF_INET6) { 2822 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2823 : IPV6_PORTRANGE_DEFAULT; 2824 2825 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2826 &on, sizeof(on)) < 0) 2827 goto pasv_error; 2828 } 2829#endif 2830 2831 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2832 goto pasv_error; 2833 2834 (void) seteuid(pw->pw_uid); 2835 2836 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2837 goto pasv_error; 2838 if (listen(pdata, 1) < 0) 2839 goto pasv_error; 2840 2841#define UC(b) (((int) b) & 0xff) 2842 2843 if (strcmp(cmd, "LPSV") == 0) { 2844 p = (char *)&pasv_addr.su_port; 2845 switch (pasv_addr.su_family) { 2846 case AF_INET: 2847 a = (char *) &pasv_addr.su_sin.sin_addr; 2848 v4_reply: 2849 reply(228, 2850"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2851 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2852 2, UC(p[0]), UC(p[1])); 2853 return; 2854 case AF_INET6: 2855 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2856 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2857 goto v4_reply; 2858 } 2859 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2860 reply(228, 2861"Entering Long Passive Mode " 2862"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2863 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2864 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2865 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2866 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2867 2, UC(p[0]), UC(p[1])); 2868 return; 2869 } 2870 } else if (strcmp(cmd, "EPSV") == 0) { 2871 switch (pasv_addr.su_family) { 2872 case AF_INET: 2873 case AF_INET6: 2874 reply(229, "Entering Extended Passive Mode (|||%d|)", 2875 ntohs(pasv_addr.su_port)); 2876 return; 2877 } 2878 } else { 2879 /* more proper error code? */ 2880 } 2881 2882pasv_error: 2883 (void) seteuid(pw->pw_uid); 2884 (void) close(pdata); 2885 pdata = -1; 2886 perror_reply(425, "Can't open passive connection"); 2887 return; 2888} 2889 2890/* 2891 * Generate unique name for file with basename "local" 2892 * and open the file in order to avoid possible races. 2893 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2894 * Return descriptor to the file, set "name" to its name. 2895 * 2896 * Generates failure reply on error. 2897 */ 2898static int 2899guniquefd(char *local, char **name) 2900{ 2901 static char new[MAXPATHLEN]; 2902 struct stat st; 2903 char *cp; 2904 int count; 2905 int fd; 2906 2907 cp = strrchr(local, '/'); 2908 if (cp) 2909 *cp = '\0'; 2910 if (stat(cp ? local : ".", &st) < 0) { 2911 perror_reply(553, cp ? local : "."); 2912 return (-1); 2913 } 2914 if (cp) { 2915 /* 2916 * Let not overwrite dirname with counter suffix. 2917 * -4 is for /nn\0 2918 * In this extreme case dot won't be put in front of suffix. 2919 */ 2920 if (strlen(local) > sizeof(new) - 4) { 2921 reply(553, "Pathname too long."); 2922 return (-1); 2923 } 2924 *cp = '/'; 2925 } 2926 /* -4 is for the .nn<null> we put on the end below */ 2927 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2928 cp = new + strlen(new); 2929 /* 2930 * Don't generate dotfile unless requested explicitly. 2931 * This covers the case when basename gets truncated off 2932 * by buffer size. 2933 */ 2934 if (cp > new && cp[-1] != '/') 2935 *cp++ = '.'; 2936 for (count = 0; count < 100; count++) { 2937 /* At count 0 try unmodified name */ 2938 if (count) 2939 (void)sprintf(cp, "%d", count); 2940 if ((fd = open(count ? new : local, 2941 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2942 *name = count ? new : local; 2943 return (fd); 2944 } 2945 if (errno != EEXIST) { 2946 perror_reply(553, count ? new : local); 2947 return (-1); 2948 } 2949 } 2950 reply(452, "Unique file name cannot be created."); 2951 return (-1); 2952} 2953 2954/* 2955 * Format and send reply containing system error number. 2956 */ 2957void 2958perror_reply(int code, char *string) 2959{ 2960 2961 reply(code, "%s: %s.", string, strerror(errno)); 2962} 2963 2964static char *onefile[] = { 2965 "", 2966 0 2967}; 2968 2969void 2970send_file_list(char *whichf) 2971{ 2972 struct stat st; 2973 DIR *dirp = NULL; 2974 struct dirent *dir; 2975 FILE *dout = NULL; 2976 char **dirlist, *dirname; 2977 int simple = 0; 2978 int freeglob = 0; 2979 glob_t gl; 2980 2981 if (strpbrk(whichf, "~{[*?") != NULL) { 2982 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2983 2984 memset(&gl, 0, sizeof(gl)); 2985 gl.gl_matchc = MAXGLOBARGS; 2986 flags |= GLOB_LIMIT; 2987 freeglob = 1; 2988 if (glob(whichf, flags, 0, &gl)) { 2989 reply(550, "No matching files found."); 2990 goto out; 2991 } else if (gl.gl_pathc == 0) { 2992 errno = ENOENT; 2993 perror_reply(550, whichf); 2994 goto out; 2995 } 2996 dirlist = gl.gl_pathv; 2997 } else { 2998 onefile[0] = whichf; 2999 dirlist = onefile; 3000 simple = 1; 3001 } 3002 3003 while ((dirname = *dirlist++)) { 3004 if (stat(dirname, &st) < 0) { 3005 /* 3006 * If user typed "ls -l", etc, and the client 3007 * used NLST, do what the user meant. 3008 */ 3009 if (dirname[0] == '-' && *dirlist == NULL && 3010 transflag == 0) { 3011 retrieve(_PATH_LS " %s", dirname); 3012 goto out; 3013 } 3014 perror_reply(550, whichf); 3015 if (dout != NULL) { 3016 (void) fclose(dout); 3017 transflag = 0; 3018 data = -1; 3019 pdata = -1; 3020 } 3021 goto out; 3022 } 3023 3024 if (S_ISREG(st.st_mode)) { 3025 if (dout == NULL) { 3026 dout = dataconn("file list", -1, "w"); 3027 if (dout == NULL) 3028 goto out; 3029 transflag++; 3030 } 3031 fprintf(dout, "%s%s\n", dirname, 3032 type == TYPE_A ? "\r" : ""); 3033 byte_count += strlen(dirname) + 1; 3034 continue; 3035 } else if (!S_ISDIR(st.st_mode)) 3036 continue; 3037 3038 if ((dirp = opendir(dirname)) == NULL) 3039 continue; 3040 3041 while ((dir = readdir(dirp)) != NULL) { 3042 char nbuf[MAXPATHLEN]; 3043 3044 if (recvurg) { 3045 myoob(); 3046 recvurg = 0; 3047 transflag = 0; 3048 goto out; 3049 } 3050 3051 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3052 continue; 3053 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3054 dir->d_namlen == 2) 3055 continue; 3056 3057 snprintf(nbuf, sizeof(nbuf), 3058 "%s/%s", dirname, dir->d_name); 3059 3060 /* 3061 * We have to do a stat to insure it's 3062 * not a directory or special file. 3063 */ 3064 if (simple || (stat(nbuf, &st) == 0 && 3065 S_ISREG(st.st_mode))) { 3066 if (dout == NULL) { 3067 dout = dataconn("file list", -1, "w"); 3068 if (dout == NULL) 3069 goto out; 3070 transflag++; 3071 } 3072 if (nbuf[0] == '.' && nbuf[1] == '/') 3073 fprintf(dout, "%s%s\n", &nbuf[2], 3074 type == TYPE_A ? "\r" : ""); 3075 else 3076 fprintf(dout, "%s%s\n", nbuf, 3077 type == TYPE_A ? "\r" : ""); 3078 byte_count += strlen(nbuf) + 1; 3079 } 3080 } 3081 (void) closedir(dirp); 3082 } 3083 3084 if (dout == NULL) 3085 reply(550, "No files found."); 3086 else if (ferror(dout) != 0) 3087 perror_reply(550, "Data connection"); 3088 else 3089 reply(226, "Transfer complete."); 3090 3091 transflag = 0; 3092 if (dout != NULL) 3093 (void) fclose(dout); 3094 data = -1; 3095 pdata = -1; 3096out: 3097 if (freeglob) { 3098 freeglob = 0; 3099 globfree(&gl); 3100 } 3101} 3102 3103void 3104reapchild(int signo) 3105{ 3106 while (waitpid(-1, NULL, WNOHANG) > 0); 3107} 3108 3109#ifdef OLD_SETPROCTITLE 3110/* 3111 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3112 * Warning, since this is usually started from inetd.conf, it often doesn't 3113 * have much of an environment or arglist to overwrite. 3114 */ 3115void 3116setproctitle(const char *fmt, ...) 3117{ 3118 int i; 3119 va_list ap; 3120 char *p, *bp, ch; 3121 char buf[LINE_MAX]; 3122 3123 va_start(ap, fmt); 3124 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3125 3126 /* make ps print our process name */ 3127 p = Argv[0]; 3128 *p++ = '-'; 3129 3130 i = strlen(buf); 3131 if (i > LastArgv - p - 2) { 3132 i = LastArgv - p - 2; 3133 buf[i] = '\0'; 3134 } 3135 bp = buf; 3136 while (ch = *bp++) 3137 if (ch != '\n' && ch != '\r') 3138 *p++ = ch; 3139 while (p < LastArgv) 3140 *p++ = ' '; 3141} 3142#endif /* OLD_SETPROCTITLE */ 3143 3144static void 3145appendf(char **strp, char *fmt, ...) 3146{ 3147 va_list ap; 3148 char *ostr, *p; 3149 3150 va_start(ap, fmt); 3151 vasprintf(&p, fmt, ap); 3152 va_end(ap); 3153 if (p == NULL) 3154 fatalerror("Ran out of memory."); 3155 if (*strp == NULL) 3156 *strp = p; 3157 else { 3158 ostr = *strp; 3159 asprintf(strp, "%s%s", ostr, p); 3160 if (*strp == NULL) 3161 fatalerror("Ran out of memory."); 3162 free(ostr); 3163 } 3164} 3165 3166static void 3167logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3168{ 3169 char *msg = NULL; 3170 char wd[MAXPATHLEN + 1]; 3171 3172 if (logging <= 1) 3173 return; 3174 /* If either filename isn't absolute, get current dir for log message. */ 3175 if ((file1 && file1[0] != '/') || (file2 && file2[0] != '/')) { 3176 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3177 strcpy(wd, strerror(errno)); 3178 } else 3179 wd[0] = '\0'; 3180 3181 appendf(&msg, "%s", cmd); 3182 if (file1) 3183 appendf(&msg, " %s", file1); 3184 if (file2) 3185 appendf(&msg, " %s", file2); 3186 if (cnt >= 0) 3187 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3188 if (wd[0]) 3189 appendf(&msg, " (wd: %s)", wd); 3190 syslog(LOG_INFO, "%s", msg); 3191 free(msg); 3192} 3193 3194static void 3195logxfer(char *name, off_t size, time_t start) 3196{ 3197 char buf[MAXPATHLEN + 1024]; 3198 char path[MAXPATHLEN + 1]; 3199 time_t now; 3200 3201 if (statfd >= 0) { 3202 time(&now); 3203 if (realpath(name, path) == NULL) { 3204 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3205 return; 3206 } 3207 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3208 ctime(&now)+4, ident, remotehost, 3209 path, (intmax_t)size, 3210 (long)(now - start + (now == start))); 3211 write(statfd, buf, strlen(buf)); 3212 } 3213} 3214 3215static char * 3216doublequote(char *s) 3217{ 3218 int n; 3219 char *p, *s2; 3220 3221 for (p = s, n = 0; *p; p++) 3222 if (*p == '"') 3223 n++; 3224 3225 if ((s2 = malloc(p - s + n + 1)) == NULL) 3226 return (NULL); 3227 3228 for (p = s2; *s; s++, p++) { 3229 if ((*p = *s) == '"') 3230 *(++p) = '"'; 3231 } 3232 *p = '\0'; 3233 3234 return (s2); 3235} 3236 3237/* setup server socket for specified address family */ 3238/* if af is PF_UNSPEC more than one socket may be returned */ 3239/* the returned list is dynamically allocated, so caller needs to free it */ 3240static int * 3241socksetup(int af, char *bindname, const char *bindport) 3242{ 3243 struct addrinfo hints, *res, *r; 3244 int error, maxs, *s, *socks; 3245 const int on = 1; 3246 3247 memset(&hints, 0, sizeof(hints)); 3248 hints.ai_flags = AI_PASSIVE; 3249 hints.ai_family = af; 3250 hints.ai_socktype = SOCK_STREAM; 3251 error = getaddrinfo(bindname, bindport, &hints, &res); 3252 if (error) { 3253 syslog(LOG_ERR, "%s", gai_strerror(error)); 3254 if (error == EAI_SYSTEM) 3255 syslog(LOG_ERR, "%s", strerror(errno)); 3256 return NULL; 3257 } 3258 3259 /* Count max number of sockets we may open */ 3260 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3261 ; 3262 socks = malloc((maxs + 1) * sizeof(int)); 3263 if (!socks) { 3264 freeaddrinfo(res); 3265 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3266 return NULL; 3267 } 3268 3269 *socks = 0; /* num of sockets counter at start of array */ 3270 s = socks + 1; 3271 for (r = res; r; r = r->ai_next) { 3272 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3273 if (*s < 0) { 3274 syslog(LOG_DEBUG, "control socket: %m"); 3275 continue; 3276 } 3277 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3278 &on, sizeof(on)) < 0) 3279 syslog(LOG_WARNING, 3280 "control setsockopt (SO_REUSEADDR): %m"); 3281 if (r->ai_family == AF_INET6) { 3282 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3283 &on, sizeof(on)) < 0) 3284 syslog(LOG_WARNING, 3285 "control setsockopt (IPV6_V6ONLY): %m"); 3286 } 3287 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3288 syslog(LOG_DEBUG, "control bind: %m"); 3289 close(*s); 3290 continue; 3291 } 3292 (*socks)++; 3293 s++; 3294 } 3295 3296 if (res) 3297 freeaddrinfo(res); 3298 3299 if (*socks == 0) { 3300 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3301 free(socks); 3302 return NULL; 3303 } 3304 return(socks); 3305} 3306