ftpd.c revision 136555
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 136555 2004-10-15 09:38:13Z 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) \ 219 if (logging > 1) \ 220 syslog(LOG_INFO,"%s %s%s", cmd, \ 221 *(file) == '/' ? "" : curdir(), file); 222#define LOGCMD2(cmd, file1, file2) \ 223 if (logging > 1) \ 224 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 225 *(file1) == '/' ? "" : curdir(), file1, \ 226 *(file2) == '/' ? "" : curdir(), file2); 227#define LOGBYTES(cmd, file, cnt) \ 228 if (logging > 1) { \ 229 if (cnt == -1) \ 230 syslog(LOG_INFO,"%s %s%s", cmd, \ 231 *(file) == '/' ? "" : curdir(), file); \ 232 else \ 233 syslog(LOG_INFO, "%s %s%s = %jd bytes", \ 234 cmd, (*(file) == '/') ? "" : curdir(), file, \ 235 (intmax_t)cnt); \ 236 } 237 238#ifdef VIRTUAL_HOSTING 239static void inithosts(void); 240static void selecthost(union sockunion *); 241#endif 242static void ack(char *); 243static void sigurg(int); 244static void myoob(void); 245static int checkuser(char *, char *, int, char **); 246static FILE *dataconn(char *, off_t, char *); 247static void dolog(struct sockaddr *); 248static char *curdir(void); 249static void end_login(void); 250static FILE *getdatasock(char *); 251static int guniquefd(char *, char **); 252static void lostconn(int); 253static void sigquit(int); 254static int receive_data(FILE *, FILE *); 255static int send_data(FILE *, FILE *, off_t, off_t, int); 256static struct passwd * 257 sgetpwnam(char *); 258static char *sgetsave(char *); 259static void reapchild(int); 260static void logxfer(char *, off_t, time_t); 261static char *doublequote(char *); 262static int *socksetup(int, char *, const char *); 263 264static char * 265curdir(void) 266{ 267 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 268 269 if (getcwd(path, sizeof(path)-2) == NULL) 270 return (""); 271 if (path[1] != '\0') /* special case for root dir. */ 272 strcat(path, "/"); 273 /* For guest account, skip / since it's chrooted */ 274 return (guest ? path+1 : path); 275} 276 277int 278main(int argc, char *argv[], char **envp) 279{ 280 int addrlen, ch, on = 1, tos; 281 char *cp, line[LINE_MAX]; 282 FILE *fd; 283 char *bindname = NULL; 284 const char *bindport = "ftp"; 285 int family = AF_UNSPEC; 286 struct sigaction sa; 287 288 tzset(); /* in case no timezone database in ~ftp */ 289 sigemptyset(&sa.sa_mask); 290 sa.sa_flags = SA_RESTART; 291 292#ifdef OLD_SETPROCTITLE 293 /* 294 * Save start and extent of argv for setproctitle. 295 */ 296 Argv = argv; 297 while (*envp) 298 envp++; 299 LastArgv = envp[-1] + strlen(envp[-1]); 300#endif /* OLD_SETPROCTITLE */ 301 302 303 while ((ch = getopt(argc, argv, 304 "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 305 switch (ch) { 306 case '4': 307 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 308 break; 309 310 case '6': 311 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 312 break; 313 314 case 'a': 315 bindname = optarg; 316 break; 317 318 case 'A': 319 anon_only = 1; 320 break; 321 322 case 'd': 323 ftpdebug++; 324 break; 325 326 case 'D': 327 daemon_mode++; 328 break; 329 330 case 'E': 331 noepsv = 1; 332 break; 333 334 case 'h': 335 hostinfo = 0; 336 break; 337 338 case 'l': 339 logging++; /* > 1 == extra logging */ 340 break; 341 342 case 'm': 343 noguestmod = 0; 344 break; 345 346 case 'M': 347 noguestmkd = 1; 348 break; 349 350 case 'o': 351 noretr = 1; 352 break; 353 354 case 'O': 355 noguestretr = 1; 356 break; 357 358 case 'p': 359 pid_file = optarg; 360 break; 361 362 case 'P': 363 bindport = optarg; 364 break; 365 366 case 'r': 367 readonly = 1; 368 break; 369 370 case 'R': 371 paranoid = 0; 372 break; 373 374 case 'S': 375 stats++; 376 break; 377 378 case 't': 379 timeout = atoi(optarg); 380 if (maxtimeout < timeout) 381 maxtimeout = timeout; 382 break; 383 384 case 'T': 385 maxtimeout = atoi(optarg); 386 if (timeout > maxtimeout) 387 timeout = maxtimeout; 388 break; 389 390 case 'u': 391 { 392 long val = 0; 393 394 val = strtol(optarg, &optarg, 8); 395 if (*optarg != '\0' || val < 0) 396 warnx("bad value for -u"); 397 else 398 defumask = val; 399 break; 400 } 401 case 'U': 402 restricted_data_ports = 0; 403 break; 404 405 case 'v': 406 ftpdebug++; 407 break; 408 409 case 'W': 410 dowtmp = 0; 411 break; 412 413 default: 414 warnx("unknown flag -%c ignored", optopt); 415 break; 416 } 417 } 418 419#ifdef VIRTUAL_HOSTING 420 inithosts(); 421#endif 422 (void) freopen(_PATH_DEVNULL, "w", stderr); 423 424 /* 425 * LOG_NDELAY sets up the logging connection immediately, 426 * necessary for anonymous ftp's that chroot and can't do it later. 427 */ 428 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 429 430 if (daemon_mode) { 431 int *ctl_sock, fd, maxfd = -1, nfds, i; 432 fd_set defreadfds, readfds; 433 pid_t pid; 434 435 /* 436 * Detach from parent. 437 */ 438 if (daemon(1, 1) < 0) { 439 syslog(LOG_ERR, "failed to become a daemon"); 440 exit(1); 441 } 442 sa.sa_handler = reapchild; 443 (void)sigaction(SIGCHLD, &sa, NULL); 444 445 /* 446 * Open a socket, bind it to the FTP port, and start 447 * listening. 448 */ 449 ctl_sock = socksetup(family, bindname, bindport); 450 if (ctl_sock == NULL) 451 exit(1); 452 453 FD_ZERO(&defreadfds); 454 for (i = 1; i <= *ctl_sock; i++) { 455 FD_SET(ctl_sock[i], &defreadfds); 456 if (listen(ctl_sock[i], 32) < 0) { 457 syslog(LOG_ERR, "control listen: %m"); 458 exit(1); 459 } 460 if (maxfd < ctl_sock[i]) 461 maxfd = ctl_sock[i]; 462 } 463 464 /* 465 * Atomically write process ID 466 */ 467 if (pid_file) 468 { 469 int fd; 470 char buf[20]; 471 472 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 473 | O_NONBLOCK | O_EXLOCK, 0644); 474 if (fd < 0) { 475 if (errno == EAGAIN) 476 errx(1, "%s: file locked", pid_file); 477 else 478 err(1, "%s", pid_file); 479 } 480 snprintf(buf, sizeof(buf), 481 "%lu\n", (unsigned long) getpid()); 482 if (write(fd, buf, strlen(buf)) < 0) 483 err(1, "%s: write", pid_file); 484 /* Leave the pid file open and locked */ 485 } 486 /* 487 * Loop forever accepting connection requests and forking off 488 * children to handle them. 489 */ 490 while (1) { 491 FD_COPY(&defreadfds, &readfds); 492 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 493 if (nfds <= 0) { 494 if (nfds < 0 && errno != EINTR) 495 syslog(LOG_WARNING, "select: %m"); 496 continue; 497 } 498 499 pid = -1; 500 for (i = 1; i <= *ctl_sock; i++) 501 if (FD_ISSET(ctl_sock[i], &readfds)) { 502 addrlen = sizeof(his_addr); 503 fd = accept(ctl_sock[i], 504 (struct sockaddr *)&his_addr, 505 &addrlen); 506 if (fd >= 0) { 507 if ((pid = fork()) == 0) { 508 /* child */ 509 (void) dup2(fd, 0); 510 (void) dup2(fd, 1); 511 close(ctl_sock[i]); 512 } else 513 close(fd); 514 } 515 } 516 if (pid == 0) 517 break; 518 } 519 } else { 520 addrlen = sizeof(his_addr); 521 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 522 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 523 exit(1); 524 } 525 } 526 527 sa.sa_handler = SIG_DFL; 528 (void)sigaction(SIGCHLD, &sa, NULL); 529 530 sa.sa_handler = sigurg; 531 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 532 (void)sigaction(SIGURG, &sa, NULL); 533 534 sigfillset(&sa.sa_mask); /* block all signals in handler */ 535 sa.sa_flags = SA_RESTART; 536 sa.sa_handler = sigquit; 537 (void)sigaction(SIGHUP, &sa, NULL); 538 (void)sigaction(SIGINT, &sa, NULL); 539 (void)sigaction(SIGQUIT, &sa, NULL); 540 (void)sigaction(SIGTERM, &sa, NULL); 541 542 sa.sa_handler = lostconn; 543 (void)sigaction(SIGPIPE, &sa, NULL); 544 545 addrlen = sizeof(ctrl_addr); 546 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 547 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 548 exit(1); 549 } 550 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 551#ifdef VIRTUAL_HOSTING 552 /* select our identity from virtual host table */ 553 selecthost(&ctrl_addr); 554#endif 555#ifdef IP_TOS 556 if (ctrl_addr.su_family == AF_INET) 557 { 558 tos = IPTOS_LOWDELAY; 559 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 560 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 561 } 562#endif 563 /* 564 * Disable Nagle on the control channel so that we don't have to wait 565 * for peer's ACK before issuing our next reply. 566 */ 567 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 568 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 569 570 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 571 572 /* set this here so klogin can use it... */ 573 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 574 575 /* Try to handle urgent data inline */ 576#ifdef SO_OOBINLINE 577 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 578 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 579#endif 580 581#ifdef F_SETOWN 582 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 583 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 584#endif 585 dolog((struct sockaddr *)&his_addr); 586 /* 587 * Set up default state 588 */ 589 data = -1; 590 type = TYPE_A; 591 form = FORM_N; 592 stru = STRU_F; 593 mode = MODE_S; 594 tmpline[0] = '\0'; 595 596 /* If logins are disabled, print out the message. */ 597 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 598 while (fgets(line, sizeof(line), fd) != NULL) { 599 if ((cp = strchr(line, '\n')) != NULL) 600 *cp = '\0'; 601 lreply(530, "%s", line); 602 } 603 (void) fflush(stdout); 604 (void) fclose(fd); 605 reply(530, "System not available."); 606 exit(0); 607 } 608#ifdef VIRTUAL_HOSTING 609 fd = fopen(thishost->welcome, "r"); 610#else 611 fd = fopen(_PATH_FTPWELCOME, "r"); 612#endif 613 if (fd != NULL) { 614 while (fgets(line, sizeof(line), fd) != NULL) { 615 if ((cp = strchr(line, '\n')) != NULL) 616 *cp = '\0'; 617 lreply(220, "%s", line); 618 } 619 (void) fflush(stdout); 620 (void) fclose(fd); 621 /* reply(220,) must follow */ 622 } 623#ifndef VIRTUAL_HOSTING 624 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 625 fatalerror("Ran out of memory."); 626 (void) gethostname(hostname, MAXHOSTNAMELEN - 1); 627 hostname[MAXHOSTNAMELEN - 1] = '\0'; 628#endif 629 if (hostinfo) 630 reply(220, "%s FTP server (%s) ready.", hostname, version); 631 else 632 reply(220, "FTP server ready."); 633 for (;;) 634 (void) yyparse(); 635 /* NOTREACHED */ 636} 637 638static void 639lostconn(int signo) 640{ 641 642 if (ftpdebug) 643 syslog(LOG_DEBUG, "lost connection"); 644 dologout(1); 645} 646 647static void 648sigquit(int signo) 649{ 650 651 syslog(LOG_ERR, "got signal %d", signo); 652 dologout(1); 653} 654 655#ifdef VIRTUAL_HOSTING 656/* 657 * read in virtual host tables (if they exist) 658 */ 659 660static void 661inithosts(void) 662{ 663 int insert; 664 size_t len; 665 FILE *fp; 666 char *cp, *mp, *line; 667 char *hostname; 668 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 669 struct ftphost *hrp, *lhrp; 670 struct addrinfo hints, *res, *ai; 671 672 /* 673 * Fill in the default host information 674 */ 675 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 676 fatalerror("Ran out of memory."); 677 if (gethostname(hostname, MAXHOSTNAMELEN) < 0) 678 hostname[0] = '\0'; 679 hostname[MAXHOSTNAMELEN - 1] = '\0'; 680 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 681 fatalerror("Ran out of memory."); 682 hrp->hostname = hostname; 683 hrp->hostinfo = NULL; 684 685 memset(&hints, 0, sizeof(hints)); 686 hints.ai_flags = AI_CANONNAME; 687 hints.ai_family = AF_UNSPEC; 688 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 689 hrp->hostinfo = res; 690 hrp->statfile = _PATH_FTPDSTATFILE; 691 hrp->welcome = _PATH_FTPWELCOME; 692 hrp->loginmsg = _PATH_FTPLOGINMESG; 693 hrp->anonuser = "ftp"; 694 hrp->next = NULL; 695 thishost = firsthost = lhrp = hrp; 696 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 697 int addrsize, gothost; 698 void *addr; 699 struct hostent *hp; 700 701 while ((line = fgetln(fp, &len)) != NULL) { 702 int i, hp_error; 703 704 /* skip comments */ 705 if (line[0] == '#') 706 continue; 707 if (line[len - 1] == '\n') { 708 line[len - 1] = '\0'; 709 mp = NULL; 710 } else { 711 if ((mp = malloc(len + 1)) == NULL) 712 fatalerror("Ran out of memory."); 713 memcpy(mp, line, len); 714 mp[len] = '\0'; 715 line = mp; 716 } 717 cp = strtok(line, " \t"); 718 /* skip empty lines */ 719 if (cp == NULL) 720 goto nextline; 721 vhost = cp; 722 723 /* set defaults */ 724 anonuser = "ftp"; 725 statfile = _PATH_FTPDSTATFILE; 726 welcome = _PATH_FTPWELCOME; 727 loginmsg = _PATH_FTPLOGINMESG; 728 729 /* 730 * Preparse the line so we can use its info 731 * for all the addresses associated with 732 * the virtual host name. 733 * Field 0, the virtual host name, is special: 734 * it's already parsed off and will be strdup'ed 735 * later, after we know its canonical form. 736 */ 737 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 738 if (*cp != '-' && (cp = strdup(cp))) 739 switch (i) { 740 case 1: /* anon user permissions */ 741 anonuser = cp; 742 break; 743 case 2: /* statistics file */ 744 statfile = cp; 745 break; 746 case 3: /* welcome message */ 747 welcome = cp; 748 break; 749 case 4: /* login message */ 750 loginmsg = cp; 751 break; 752 default: /* programming error */ 753 abort(); 754 /* NOTREACHED */ 755 } 756 757 hints.ai_flags = 0; 758 hints.ai_family = AF_UNSPEC; 759 hints.ai_flags = AI_PASSIVE; 760 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 761 goto nextline; 762 for (ai = res; ai != NULL && ai->ai_addr != NULL; 763 ai = ai->ai_next) { 764 765 gothost = 0; 766 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 767 struct addrinfo *hi; 768 769 for (hi = hrp->hostinfo; hi != NULL; 770 hi = hi->ai_next) 771 if (hi->ai_addrlen == ai->ai_addrlen && 772 memcmp(hi->ai_addr, 773 ai->ai_addr, 774 ai->ai_addr->sa_len) == 0) { 775 gothost++; 776 break; 777 } 778 if (gothost) 779 break; 780 } 781 if (hrp == NULL) { 782 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 783 goto nextline; 784 hrp->hostname = NULL; 785 insert = 1; 786 } else { 787 if (hrp->hostinfo && hrp->hostinfo != res) 788 freeaddrinfo(hrp->hostinfo); 789 insert = 0; /* host already in the chain */ 790 } 791 hrp->hostinfo = res; 792 793 /* 794 * determine hostname to use. 795 * force defined name if there is a valid alias 796 * otherwise fallback to primary hostname 797 */ 798 /* XXX: getaddrinfo() can't do alias check */ 799 switch(hrp->hostinfo->ai_family) { 800 case AF_INET: 801 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 802 addrsize = sizeof(struct in_addr); 803 break; 804 case AF_INET6: 805 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 806 addrsize = sizeof(struct in6_addr); 807 break; 808 default: 809 /* should not reach here */ 810 freeaddrinfo(hrp->hostinfo); 811 if (insert) 812 free(hrp); /*not in chain, can free*/ 813 else 814 hrp->hostinfo = NULL; /*mark as blank*/ 815 goto nextline; 816 /* NOTREACHED */ 817 } 818 if ((hp = getipnodebyaddr(addr, addrsize, 819 hrp->hostinfo->ai_family, 820 &hp_error)) != NULL) { 821 if (strcmp(vhost, hp->h_name) != 0) { 822 if (hp->h_aliases == NULL) 823 vhost = hp->h_name; 824 else { 825 i = 0; 826 while (hp->h_aliases[i] && 827 strcmp(vhost, hp->h_aliases[i]) != 0) 828 ++i; 829 if (hp->h_aliases[i] == NULL) 830 vhost = hp->h_name; 831 } 832 } 833 } 834 if (hrp->hostname && 835 strcmp(hrp->hostname, vhost) != 0) { 836 free(hrp->hostname); 837 hrp->hostname = NULL; 838 } 839 if (hrp->hostname == NULL && 840 (hrp->hostname = strdup(vhost)) == NULL) { 841 freeaddrinfo(hrp->hostinfo); 842 hrp->hostinfo = NULL; /* mark as blank */ 843 if (hp) 844 freehostent(hp); 845 goto nextline; 846 } 847 hrp->anonuser = anonuser; 848 hrp->statfile = statfile; 849 hrp->welcome = welcome; 850 hrp->loginmsg = loginmsg; 851 if (insert) { 852 hrp->next = NULL; 853 lhrp->next = hrp; 854 lhrp = hrp; 855 } 856 if (hp) 857 freehostent(hp); 858 } 859nextline: 860 if (mp) 861 free(mp); 862 } 863 (void) fclose(fp); 864 } 865} 866 867static void 868selecthost(union sockunion *su) 869{ 870 struct ftphost *hrp; 871 u_int16_t port; 872#ifdef INET6 873 struct in6_addr *mapped_in6 = NULL; 874#endif 875 struct addrinfo *hi; 876 877#ifdef INET6 878 /* 879 * XXX IPv4 mapped IPv6 addr consideraton, 880 * specified in rfc2373. 881 */ 882 if (su->su_family == AF_INET6 && 883 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 884 mapped_in6 = &su->su_sin6.sin6_addr; 885#endif 886 887 hrp = thishost = firsthost; /* default */ 888 port = su->su_port; 889 su->su_port = 0; 890 while (hrp != NULL) { 891 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 892 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 893 thishost = hrp; 894 break; 895 } 896#ifdef INET6 897 /* XXX IPv4 mapped IPv6 addr consideraton */ 898 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 899 (memcmp(&mapped_in6->s6_addr[12], 900 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 901 sizeof(struct in_addr)) == 0)) { 902 thishost = hrp; 903 break; 904 } 905#endif 906 } 907 hrp = hrp->next; 908 } 909 su->su_port = port; 910 /* setup static variables as appropriate */ 911 hostname = thishost->hostname; 912 ftpuser = thishost->anonuser; 913} 914#endif 915 916/* 917 * Helper function for sgetpwnam(). 918 */ 919static char * 920sgetsave(char *s) 921{ 922 char *new = malloc((unsigned) strlen(s) + 1); 923 924 if (new == NULL) { 925 perror_reply(421, "Local resource failure: malloc"); 926 dologout(1); 927 /* NOTREACHED */ 928 } 929 (void) strcpy(new, s); 930 return (new); 931} 932 933/* 934 * Save the result of a getpwnam. Used for USER command, since 935 * the data returned must not be clobbered by any other command 936 * (e.g., globbing). 937 */ 938static struct passwd * 939sgetpwnam(char *name) 940{ 941 static struct passwd save; 942 struct passwd *p; 943 944 if ((p = getpwnam(name)) == NULL) 945 return (p); 946 if (save.pw_name) { 947 free(save.pw_name); 948 free(save.pw_passwd); 949 free(save.pw_gecos); 950 free(save.pw_dir); 951 free(save.pw_shell); 952 } 953 save = *p; 954 save.pw_name = sgetsave(p->pw_name); 955 save.pw_passwd = sgetsave(p->pw_passwd); 956 save.pw_gecos = sgetsave(p->pw_gecos); 957 save.pw_dir = sgetsave(p->pw_dir); 958 save.pw_shell = sgetsave(p->pw_shell); 959 return (&save); 960} 961 962static int login_attempts; /* number of failed login attempts */ 963static int askpasswd; /* had user command, ask for passwd */ 964static char curname[MAXLOGNAME]; /* current USER name */ 965 966/* 967 * USER command. 968 * Sets global passwd pointer pw if named account exists and is acceptable; 969 * sets askpasswd if a PASS command is expected. If logged in previously, 970 * need to reset state. If name is "ftp" or "anonymous", the name is not in 971 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 972 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 973 * requesting login privileges. Disallow anyone who does not have a standard 974 * shell as returned by getusershell(). Disallow anyone mentioned in the file 975 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 976 */ 977void 978user(char *name) 979{ 980 char *cp, *shell; 981 982 if (logged_in) { 983 if (guest) { 984 reply(530, "Can't change user from guest login."); 985 return; 986 } else if (dochroot) { 987 reply(530, "Can't change user from chroot user."); 988 return; 989 } 990 end_login(); 991 } 992 993 guest = 0; 994#ifdef VIRTUAL_HOSTING 995 pw = sgetpwnam(thishost->anonuser); 996#else 997 pw = sgetpwnam("ftp"); 998#endif 999 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1000 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 1001 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 1002 reply(530, "User %s access denied.", name); 1003 else if (pw != NULL) { 1004 guest = 1; 1005 askpasswd = 1; 1006 reply(331, 1007 "Guest login ok, send your email address as password."); 1008 } else 1009 reply(530, "User %s unknown.", name); 1010 if (!askpasswd && logging) 1011 syslog(LOG_NOTICE, 1012 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1013 return; 1014 } 1015 if (anon_only != 0) { 1016 reply(530, "Sorry, only anonymous ftp allowed."); 1017 return; 1018 } 1019 1020 if ((pw = sgetpwnam(name))) { 1021 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1022 shell = _PATH_BSHELL; 1023 setusershell(); 1024 while ((cp = getusershell()) != NULL) 1025 if (strcmp(cp, shell) == 0) 1026 break; 1027 endusershell(); 1028 1029 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1030 reply(530, "User %s access denied.", name); 1031 if (logging) 1032 syslog(LOG_NOTICE, 1033 "FTP LOGIN REFUSED FROM %s, %s", 1034 remotehost, name); 1035 pw = (struct passwd *) NULL; 1036 return; 1037 } 1038 } 1039 if (logging) 1040 strncpy(curname, name, sizeof(curname)-1); 1041 1042 pwok = 0; 1043#ifdef USE_PAM 1044 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1045#endif 1046 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1047 pwok = (pw != NULL) && 1048 opieaccessfile(remotehost) && 1049 opiealways(pw->pw_dir); 1050 reply(331, "Response to %s %s for %s.", 1051 opieprompt, pwok ? "requested" : "required", name); 1052 } else { 1053 pwok = 1; 1054 reply(331, "Password required for %s.", name); 1055 } 1056 askpasswd = 1; 1057 /* 1058 * Delay before reading passwd after first failed 1059 * attempt to slow down passwd-guessing programs. 1060 */ 1061 if (login_attempts) 1062 sleep((unsigned) login_attempts); 1063} 1064 1065/* 1066 * Check if a user is in the file "fname", 1067 * return a pointer to a malloc'd string with the rest 1068 * of the matching line in "residue" if not NULL. 1069 */ 1070static int 1071checkuser(char *fname, char *name, int pwset, char **residue) 1072{ 1073 FILE *fd; 1074 int found = 0; 1075 size_t len; 1076 char *line, *mp, *p; 1077 1078 if ((fd = fopen(fname, "r")) != NULL) { 1079 while (!found && (line = fgetln(fd, &len)) != NULL) { 1080 /* skip comments */ 1081 if (line[0] == '#') 1082 continue; 1083 if (line[len - 1] == '\n') { 1084 line[len - 1] = '\0'; 1085 mp = NULL; 1086 } else { 1087 if ((mp = malloc(len + 1)) == NULL) 1088 fatalerror("Ran out of memory."); 1089 memcpy(mp, line, len); 1090 mp[len] = '\0'; 1091 line = mp; 1092 } 1093 /* avoid possible leading and trailing whitespace */ 1094 p = strtok(line, " \t"); 1095 /* skip empty lines */ 1096 if (p == NULL) 1097 goto nextline; 1098 /* 1099 * if first chr is '@', check group membership 1100 */ 1101 if (p[0] == '@') { 1102 int i = 0; 1103 struct group *grp; 1104 1105 if (p[1] == '\0') /* single @ matches anyone */ 1106 found = 1; 1107 else { 1108 if ((grp = getgrnam(p+1)) == NULL) 1109 goto nextline; 1110 /* 1111 * Check user's default group 1112 */ 1113 if (pwset && grp->gr_gid == pw->pw_gid) 1114 found = 1; 1115 /* 1116 * Check supplementary groups 1117 */ 1118 while (!found && grp->gr_mem[i]) 1119 found = strcmp(name, 1120 grp->gr_mem[i++]) 1121 == 0; 1122 } 1123 } 1124 /* 1125 * Otherwise, just check for username match 1126 */ 1127 else 1128 found = strcmp(p, name) == 0; 1129 /* 1130 * Save the rest of line to "residue" if matched 1131 */ 1132 if (found && residue) { 1133 if ((p = strtok(NULL, "")) != NULL) 1134 p += strspn(p, " \t"); 1135 if (p && *p) { 1136 if ((*residue = strdup(p)) == NULL) 1137 fatalerror("Ran out of memory."); 1138 } else 1139 *residue = NULL; 1140 } 1141nextline: 1142 if (mp) 1143 free(mp); 1144 } 1145 (void) fclose(fd); 1146 } 1147 return (found); 1148} 1149 1150/* 1151 * Terminate login as previous user, if any, resetting state; 1152 * used when USER command is given or login fails. 1153 */ 1154static void 1155end_login(void) 1156{ 1157#ifdef USE_PAM 1158 int e; 1159#endif 1160 1161 (void) seteuid(0); 1162 if (logged_in && dowtmp) 1163 ftpd_logwtmp(ttyline, "", NULL); 1164 pw = NULL; 1165#ifdef LOGIN_CAP 1166 setusercontext(NULL, getpwuid(0), 0, 1167 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1168 LOGIN_SETMAC); 1169#endif 1170#ifdef USE_PAM 1171 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1172 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1173 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1174 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1175 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1176 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1177 pamh = NULL; 1178#endif 1179 logged_in = 0; 1180 guest = 0; 1181 dochroot = 0; 1182} 1183 1184#ifdef USE_PAM 1185 1186/* 1187 * the following code is stolen from imap-uw PAM authentication module and 1188 * login.c 1189 */ 1190#define COPY_STRING(s) (s ? strdup(s) : NULL) 1191 1192struct cred_t { 1193 const char *uname; /* user name */ 1194 const char *pass; /* password */ 1195}; 1196typedef struct cred_t cred_t; 1197 1198static int 1199auth_conv(int num_msg, const struct pam_message **msg, 1200 struct pam_response **resp, void *appdata) 1201{ 1202 int i; 1203 cred_t *cred = (cred_t *) appdata; 1204 struct pam_response *reply; 1205 1206 reply = calloc(num_msg, sizeof *reply); 1207 if (reply == NULL) 1208 return PAM_BUF_ERR; 1209 1210 for (i = 0; i < num_msg; i++) { 1211 switch (msg[i]->msg_style) { 1212 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1213 reply[i].resp_retcode = PAM_SUCCESS; 1214 reply[i].resp = COPY_STRING(cred->uname); 1215 /* PAM frees resp. */ 1216 break; 1217 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1218 reply[i].resp_retcode = PAM_SUCCESS; 1219 reply[i].resp = COPY_STRING(cred->pass); 1220 /* PAM frees resp. */ 1221 break; 1222 case PAM_TEXT_INFO: 1223 case PAM_ERROR_MSG: 1224 reply[i].resp_retcode = PAM_SUCCESS; 1225 reply[i].resp = NULL; 1226 break; 1227 default: /* unknown message style */ 1228 free(reply); 1229 return PAM_CONV_ERR; 1230 } 1231 } 1232 1233 *resp = reply; 1234 return PAM_SUCCESS; 1235} 1236 1237/* 1238 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1239 * authenticated, or 1 if not authenticated. If some sort of PAM system 1240 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1241 * function returns -1. This can be used as an indication that we should 1242 * fall back to a different authentication mechanism. 1243 */ 1244static int 1245auth_pam(struct passwd **ppw, const char *pass) 1246{ 1247 pam_handle_t *pamh = NULL; 1248 const char *tmpl_user; 1249 const void *item; 1250 int rval; 1251 int e; 1252 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1253 struct pam_conv conv = { &auth_conv, &auth_cred }; 1254 1255 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1256 if (e != PAM_SUCCESS) { 1257 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e)); 1258 return -1; 1259 } 1260 1261 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1262 if (e != PAM_SUCCESS) { 1263 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1264 pam_strerror(pamh, e)); 1265 return -1; 1266 } 1267 1268 e = pam_authenticate(pamh, 0); 1269 switch (e) { 1270 case PAM_SUCCESS: 1271 /* 1272 * With PAM we support the concept of a "template" 1273 * user. The user enters a login name which is 1274 * authenticated by PAM, usually via a remote service 1275 * such as RADIUS or TACACS+. If authentication 1276 * succeeds, a different but related "template" name 1277 * is used for setting the credentials, shell, and 1278 * home directory. The name the user enters need only 1279 * exist on the remote authentication server, but the 1280 * template name must be present in the local password 1281 * database. 1282 * 1283 * This is supported by two various mechanisms in the 1284 * individual modules. However, from the application's 1285 * point of view, the template user is always passed 1286 * back as a changed value of the PAM_USER item. 1287 */ 1288 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1289 PAM_SUCCESS) { 1290 tmpl_user = (const char *) item; 1291 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1292 *ppw = getpwnam(tmpl_user); 1293 } else 1294 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1295 pam_strerror(pamh, e)); 1296 rval = 0; 1297 break; 1298 1299 case PAM_AUTH_ERR: 1300 case PAM_USER_UNKNOWN: 1301 case PAM_MAXTRIES: 1302 rval = 1; 1303 break; 1304 1305 default: 1306 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1307 rval = -1; 1308 break; 1309 } 1310 1311 if (rval == 0) { 1312 e = pam_acct_mgmt(pamh, 0); 1313 if (e == PAM_NEW_AUTHTOK_REQD) { 1314 e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); 1315 if (e != PAM_SUCCESS) { 1316 syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); 1317 rval = 1; 1318 } 1319 } else if (e != PAM_SUCCESS) { 1320 rval = 1; 1321 } 1322 } 1323 1324 if (rval != 0) { 1325 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1326 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1327 } 1328 pamh = NULL; 1329 } 1330 return rval; 1331} 1332 1333#endif /* USE_PAM */ 1334 1335void 1336pass(char *passwd) 1337{ 1338 int rval; 1339 FILE *fd; 1340#ifdef LOGIN_CAP 1341 login_cap_t *lc = NULL; 1342#endif 1343#ifdef USE_PAM 1344 int e; 1345#endif 1346 char *chrootdir; 1347 char *residue = NULL; 1348 char *xpasswd; 1349 1350 if (logged_in || askpasswd == 0) { 1351 reply(503, "Login with USER first."); 1352 return; 1353 } 1354 askpasswd = 0; 1355 if (!guest) { /* "ftp" is only account allowed no password */ 1356 if (pw == NULL) { 1357 rval = 1; /* failure below */ 1358 goto skip; 1359 } 1360#ifdef USE_PAM 1361 rval = auth_pam(&pw, passwd); 1362 if (rval >= 0) { 1363 opieunlock(); 1364 goto skip; 1365 } 1366#endif 1367 if (opieverify(&opiedata, passwd) == 0) 1368 xpasswd = pw->pw_passwd; 1369 else if (pwok) { 1370 xpasswd = crypt(passwd, pw->pw_passwd); 1371 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1372 xpasswd = ":"; 1373 } else { 1374 rval = 1; 1375 goto skip; 1376 } 1377 rval = strcmp(pw->pw_passwd, xpasswd); 1378 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1379 rval = 1; /* failure */ 1380skip: 1381 /* 1382 * If rval == 1, the user failed the authentication check 1383 * above. If rval == 0, either PAM or local authentication 1384 * succeeded. 1385 */ 1386 if (rval) { 1387 reply(530, "Login incorrect."); 1388 if (logging) { 1389 syslog(LOG_NOTICE, 1390 "FTP LOGIN FAILED FROM %s", 1391 remotehost); 1392 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1393 "FTP LOGIN FAILED FROM %s, %s", 1394 remotehost, curname); 1395 } 1396 pw = NULL; 1397 if (login_attempts++ >= 5) { 1398 syslog(LOG_NOTICE, 1399 "repeated login failures from %s", 1400 remotehost); 1401 exit(0); 1402 } 1403 return; 1404 } 1405 } 1406 login_attempts = 0; /* this time successful */ 1407 if (setegid(pw->pw_gid) < 0) { 1408 reply(550, "Can't set gid."); 1409 return; 1410 } 1411 /* May be overridden by login.conf */ 1412 (void) umask(defumask); 1413#ifdef LOGIN_CAP 1414 if ((lc = login_getpwclass(pw)) != NULL) { 1415 char remote_ip[MAXHOSTNAMELEN]; 1416 1417 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1418 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1419 NI_NUMERICHOST); 1420 remote_ip[sizeof(remote_ip) - 1] = 0; 1421 if (!auth_hostok(lc, remotehost, remote_ip)) { 1422 syslog(LOG_INFO|LOG_AUTH, 1423 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1424 pw->pw_name); 1425 reply(530, "Permission denied.\n"); 1426 pw = NULL; 1427 return; 1428 } 1429 if (!auth_timeok(lc, time(NULL))) { 1430 reply(530, "Login not available right now.\n"); 1431 pw = NULL; 1432 return; 1433 } 1434 } 1435 setusercontext(lc, pw, 0, 1436 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1437 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1438#else 1439 setlogin(pw->pw_name); 1440 (void) initgroups(pw->pw_name, pw->pw_gid); 1441#endif 1442 1443#ifdef USE_PAM 1444 if (pamh) { 1445 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1446 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1447 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1448 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1449 } 1450 } 1451#endif 1452 1453 /* open wtmp before chroot */ 1454 if (dowtmp) 1455 ftpd_logwtmp(ttyline, pw->pw_name, 1456 (struct sockaddr *)&his_addr); 1457 logged_in = 1; 1458 1459 if (guest && stats && statfd < 0) 1460#ifdef VIRTUAL_HOSTING 1461 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1462#else 1463 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1464#endif 1465 if (statfd < 0) 1466 stats = 0; 1467 1468 dochroot = 1469 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1470#ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1471 || login_getcapbool(lc, "ftp-chroot", 0) 1472#endif 1473 ; 1474 chrootdir = NULL; 1475 /* 1476 * For a chrooted local user, 1477 * a) see whether ftpchroot(5) specifies a chroot directory, 1478 * b) extract the directory pathname from the line, 1479 * c) expand it to the absolute pathname if necessary. 1480 */ 1481 if (dochroot && residue && 1482 (chrootdir = strtok(residue, " \t")) != NULL) { 1483 if (chrootdir[0] != '/') 1484 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1485 else 1486 chrootdir = strdup(chrootdir); /* so it can be freed */ 1487 if (chrootdir == NULL) 1488 fatalerror("Ran out of memory."); 1489 } 1490 if (guest || dochroot) { 1491 /* 1492 * If no chroot directory set yet, use the login directory. 1493 * Copy it so it can be modified while pw->pw_dir stays intact. 1494 */ 1495 if (chrootdir == NULL && 1496 (chrootdir = strdup(pw->pw_dir)) == NULL) 1497 fatalerror("Ran out of memory."); 1498 /* 1499 * Check for the "/chroot/./home" syntax, 1500 * separate the chroot and home directory pathnames. 1501 */ 1502 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1503 *(homedir++) = '\0'; /* wipe '/' */ 1504 homedir++; /* skip '.' */ 1505 /* so chrootdir can be freed later */ 1506 if ((homedir = strdup(homedir)) == NULL) 1507 fatalerror("Ran out of memory."); 1508 } else { 1509 /* 1510 * We MUST do a chdir() after the chroot. Otherwise 1511 * the old current directory will be accessible as "." 1512 * outside the new root! 1513 */ 1514 homedir = "/"; 1515 } 1516 /* 1517 * Finally, do chroot() 1518 */ 1519 if (chroot(chrootdir) < 0) { 1520 reply(550, "Can't change root."); 1521 goto bad; 1522 } 1523 } else /* real user w/o chroot */ 1524 homedir = pw->pw_dir; 1525 /* 1526 * Set euid *before* doing chdir() so 1527 * a) the user won't be carried to a directory that he couldn't reach 1528 * on his own due to no permission to upper path components, 1529 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1530 * (uid 0 has no root power over NFS if not mapped explicitly.) 1531 */ 1532 if (seteuid(pw->pw_uid) < 0) { 1533 reply(550, "Can't set uid."); 1534 goto bad; 1535 } 1536 if (chdir(homedir) < 0) { 1537 if (guest || dochroot) { 1538 reply(550, "Can't change to base directory."); 1539 goto bad; 1540 } else { 1541 if (chdir("/") < 0) { 1542 reply(550, "Root is inaccessible."); 1543 goto bad; 1544 } 1545 lreply(230, "No directory! Logging in with home=/"); 1546 } 1547 } 1548 1549 /* 1550 * Display a login message, if it exists. 1551 * N.B. reply(230,) must follow the message. 1552 */ 1553#ifdef VIRTUAL_HOSTING 1554 fd = fopen(thishost->loginmsg, "r"); 1555#else 1556 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1557#endif 1558 if (fd != NULL) { 1559 char *cp, line[LINE_MAX]; 1560 1561 while (fgets(line, sizeof(line), fd) != NULL) { 1562 if ((cp = strchr(line, '\n')) != NULL) 1563 *cp = '\0'; 1564 lreply(230, "%s", line); 1565 } 1566 (void) fflush(stdout); 1567 (void) fclose(fd); 1568 } 1569 if (guest) { 1570 if (ident != NULL) 1571 free(ident); 1572 ident = strdup(passwd); 1573 if (ident == NULL) 1574 fatalerror("Ran out of memory."); 1575 1576 reply(230, "Guest login ok, access restrictions apply."); 1577#ifdef SETPROCTITLE 1578#ifdef VIRTUAL_HOSTING 1579 if (thishost != firsthost) 1580 snprintf(proctitle, sizeof(proctitle), 1581 "%s: anonymous(%s)/%s", remotehost, hostname, 1582 passwd); 1583 else 1584#endif 1585 snprintf(proctitle, sizeof(proctitle), 1586 "%s: anonymous/%s", remotehost, passwd); 1587 setproctitle("%s", proctitle); 1588#endif /* SETPROCTITLE */ 1589 if (logging) 1590 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1591 remotehost, passwd); 1592 } else { 1593 if (dochroot) 1594 reply(230, "User %s logged in, " 1595 "access restrictions apply.", pw->pw_name); 1596 else 1597 reply(230, "User %s logged in.", pw->pw_name); 1598 1599#ifdef SETPROCTITLE 1600 snprintf(proctitle, sizeof(proctitle), 1601 "%s: user/%s", remotehost, pw->pw_name); 1602 setproctitle("%s", proctitle); 1603#endif /* SETPROCTITLE */ 1604 if (logging) 1605 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1606 remotehost, pw->pw_name); 1607 } 1608#ifdef LOGIN_CAP 1609 login_close(lc); 1610#endif 1611 if (chrootdir) 1612 free(chrootdir); 1613 if (residue) 1614 free(residue); 1615 return; 1616bad: 1617 /* Forget all about it... */ 1618#ifdef LOGIN_CAP 1619 login_close(lc); 1620#endif 1621 if (chrootdir) 1622 free(chrootdir); 1623 if (residue) 1624 free(residue); 1625 end_login(); 1626} 1627 1628void 1629retrieve(char *cmd, char *name) 1630{ 1631 FILE *fin, *dout; 1632 struct stat st; 1633 int (*closefunc)(FILE *); 1634 time_t start; 1635 1636 if (cmd == 0) { 1637 fin = fopen(name, "r"), closefunc = fclose; 1638 st.st_size = 0; 1639 } else { 1640 char line[BUFSIZ]; 1641 1642 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1643 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1644 st.st_size = -1; 1645 st.st_blksize = BUFSIZ; 1646 } 1647 if (fin == NULL) { 1648 if (errno != 0) { 1649 perror_reply(550, name); 1650 if (cmd == 0) { 1651 LOGCMD("get", name); 1652 } 1653 } 1654 return; 1655 } 1656 byte_count = -1; 1657 if (cmd == 0) { 1658 if (fstat(fileno(fin), &st) < 0) { 1659 perror_reply(550, name); 1660 goto done; 1661 } 1662 if (!S_ISREG(st.st_mode)) { 1663 /* 1664 * Never sending a raw directory is a workaround 1665 * for buggy clients that will attempt to RETR 1666 * a directory before listing it, e.g., Mozilla. 1667 * Preventing a guest from getting irregular files 1668 * is a simple security measure. 1669 */ 1670 if (S_ISDIR(st.st_mode) || guest) { 1671 reply(550, "%s: not a plain file.", name); 1672 goto done; 1673 } 1674 st.st_size = -1; 1675 /* st.st_blksize is set for all descriptor types */ 1676 } 1677 } 1678 if (restart_point) { 1679 if (type == TYPE_A) { 1680 off_t i, n; 1681 int c; 1682 1683 n = restart_point; 1684 i = 0; 1685 while (i++ < n) { 1686 if ((c=getc(fin)) == EOF) { 1687 perror_reply(550, name); 1688 goto done; 1689 } 1690 if (c == '\n') 1691 i++; 1692 } 1693 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1694 perror_reply(550, name); 1695 goto done; 1696 } 1697 } 1698 dout = dataconn(name, st.st_size, "w"); 1699 if (dout == NULL) 1700 goto done; 1701 time(&start); 1702 send_data(fin, dout, st.st_blksize, st.st_size, 1703 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1704 if (cmd == 0 && guest && stats) 1705 logxfer(name, st.st_size, start); 1706 (void) fclose(dout); 1707 data = -1; 1708 pdata = -1; 1709done: 1710 if (cmd == 0) 1711 LOGBYTES("get", name, byte_count); 1712 (*closefunc)(fin); 1713} 1714 1715void 1716store(char *name, char *mode, int unique) 1717{ 1718 int fd; 1719 FILE *fout, *din; 1720 int (*closefunc)(FILE *); 1721 1722 if (*mode == 'a') { /* APPE */ 1723 if (unique) { 1724 /* Programming error */ 1725 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1726 unique = 0; 1727 } 1728 if (guest && noguestmod) { 1729 reply(550, "Appending to existing file denied"); 1730 goto err; 1731 } 1732 restart_point = 0; /* not affected by preceding REST */ 1733 } 1734 if (unique) /* STOU overrides REST */ 1735 restart_point = 0; 1736 if (guest && noguestmod) { 1737 if (restart_point) { /* guest STOR w/REST */ 1738 reply(550, "Modifying existing file denied"); 1739 goto err; 1740 } else /* treat guest STOR as STOU */ 1741 unique = 1; 1742 } 1743 1744 if (restart_point) 1745 mode = "r+"; /* so ASCII manual seek can work */ 1746 if (unique) { 1747 if ((fd = guniquefd(name, &name)) < 0) 1748 goto err; 1749 fout = fdopen(fd, mode); 1750 } else 1751 fout = fopen(name, mode); 1752 closefunc = fclose; 1753 if (fout == NULL) { 1754 perror_reply(553, name); 1755 goto err; 1756 } 1757 byte_count = -1; 1758 if (restart_point) { 1759 if (type == TYPE_A) { 1760 off_t i, n; 1761 int c; 1762 1763 n = restart_point; 1764 i = 0; 1765 while (i++ < n) { 1766 if ((c=getc(fout)) == EOF) { 1767 perror_reply(550, name); 1768 goto done; 1769 } 1770 if (c == '\n') 1771 i++; 1772 } 1773 /* 1774 * We must do this seek to "current" position 1775 * because we are changing from reading to 1776 * writing. 1777 */ 1778 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1779 perror_reply(550, name); 1780 goto done; 1781 } 1782 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1783 perror_reply(550, name); 1784 goto done; 1785 } 1786 } 1787 din = dataconn(name, -1, "r"); 1788 if (din == NULL) 1789 goto done; 1790 if (receive_data(din, fout) == 0) { 1791 if (unique) 1792 reply(226, "Transfer complete (unique file name:%s).", 1793 name); 1794 else 1795 reply(226, "Transfer complete."); 1796 } 1797 (void) fclose(din); 1798 data = -1; 1799 pdata = -1; 1800done: 1801 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1802 (*closefunc)(fout); 1803 return; 1804err: 1805 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1806 return; 1807} 1808 1809static FILE * 1810getdatasock(char *mode) 1811{ 1812 int on = 1, s, t, tries; 1813 1814 if (data >= 0) 1815 return (fdopen(data, mode)); 1816 1817 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1818 if (s < 0) 1819 goto bad; 1820 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1821 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1822 /* anchor socket to avoid multi-homing problems */ 1823 data_source = ctrl_addr; 1824 data_source.su_port = htons(dataport); 1825 (void) seteuid(0); 1826 for (tries = 1; ; tries++) { 1827 /* 1828 * We should loop here since it's possible that 1829 * another ftpd instance has passed this point and is 1830 * trying to open a data connection in active mode now. 1831 * Until the other connection is opened, we'll be getting 1832 * EADDRINUSE because no SOCK_STREAM sockets in the system 1833 * can share both local and remote addresses, localIP:20 1834 * and *:* in this case. 1835 */ 1836 if (bind(s, (struct sockaddr *)&data_source, 1837 data_source.su_len) >= 0) 1838 break; 1839 if (errno != EADDRINUSE || tries > 10) 1840 goto bad; 1841 sleep(tries); 1842 } 1843 (void) seteuid(pw->pw_uid); 1844#ifdef IP_TOS 1845 if (data_source.su_family == AF_INET) 1846 { 1847 on = IPTOS_THROUGHPUT; 1848 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1849 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1850 } 1851#endif 1852#ifdef TCP_NOPUSH 1853 /* 1854 * Turn off push flag to keep sender TCP from sending short packets 1855 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1856 * to set the send buffer size as well, but that may not be desirable 1857 * in heavy-load situations. 1858 */ 1859 on = 1; 1860 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1861 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1862#endif 1863#ifdef SO_SNDBUF 1864 on = 65536; 1865 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1866 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1867#endif 1868 1869 return (fdopen(s, mode)); 1870bad: 1871 /* Return the real value of errno (close may change it) */ 1872 t = errno; 1873 (void) seteuid(pw->pw_uid); 1874 (void) close(s); 1875 errno = t; 1876 return (NULL); 1877} 1878 1879static FILE * 1880dataconn(char *name, off_t size, char *mode) 1881{ 1882 char sizebuf[32]; 1883 FILE *file; 1884 int retry = 0, tos, conerrno; 1885 1886 file_size = size; 1887 byte_count = 0; 1888 if (size != -1) 1889 (void) snprintf(sizebuf, sizeof(sizebuf), 1890 " (%jd bytes)", (intmax_t)size); 1891 else 1892 *sizebuf = '\0'; 1893 if (pdata >= 0) { 1894 union sockunion from; 1895 int flags; 1896 int s, fromlen = ctrl_addr.su_len; 1897 struct timeval timeout; 1898 fd_set set; 1899 1900 FD_ZERO(&set); 1901 FD_SET(pdata, &set); 1902 1903 timeout.tv_usec = 0; 1904 timeout.tv_sec = 120; 1905 1906 /* 1907 * Granted a socket is in the blocking I/O mode, 1908 * accept() will block after a successful select() 1909 * if the selected connection dies in between. 1910 * Therefore set the non-blocking I/O flag here. 1911 */ 1912 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1913 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1914 goto pdata_err; 1915 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1916 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1917 goto pdata_err; 1918 (void) close(pdata); 1919 pdata = s; 1920 /* 1921 * Unset the inherited non-blocking I/O flag 1922 * on the child socket so stdio can work on it. 1923 */ 1924 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1925 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1926 goto pdata_err; 1927#ifdef IP_TOS 1928 if (from.su_family == AF_INET) 1929 { 1930 tos = IPTOS_THROUGHPUT; 1931 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1932 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1933 } 1934#endif 1935 reply(150, "Opening %s mode data connection for '%s'%s.", 1936 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1937 return (fdopen(pdata, mode)); 1938pdata_err: 1939 reply(425, "Can't open data connection."); 1940 (void) close(pdata); 1941 pdata = -1; 1942 return (NULL); 1943 } 1944 if (data >= 0) { 1945 reply(125, "Using existing data connection for '%s'%s.", 1946 name, sizebuf); 1947 usedefault = 1; 1948 return (fdopen(data, mode)); 1949 } 1950 if (usedefault) 1951 data_dest = his_addr; 1952 usedefault = 1; 1953 do { 1954 file = getdatasock(mode); 1955 if (file == NULL) { 1956 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1957 getnameinfo((struct sockaddr *)&data_source, 1958 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1959 portbuf, sizeof(portbuf), 1960 NI_NUMERICHOST|NI_NUMERICSERV); 1961 reply(425, "Can't create data socket (%s,%s): %s.", 1962 hostbuf, portbuf, strerror(errno)); 1963 return (NULL); 1964 } 1965 data = fileno(file); 1966 conerrno = 0; 1967 if (connect(data, (struct sockaddr *)&data_dest, 1968 data_dest.su_len) == 0) 1969 break; 1970 conerrno = errno; 1971 (void) fclose(file); 1972 data = -1; 1973 if (conerrno == EADDRINUSE) { 1974 sleep((unsigned) swaitint); 1975 retry += swaitint; 1976 } else { 1977 break; 1978 } 1979 } while (retry <= swaitmax); 1980 if (conerrno != 0) { 1981 perror_reply(425, "Can't build data connection"); 1982 return (NULL); 1983 } 1984 reply(150, "Opening %s mode data connection for '%s'%s.", 1985 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1986 return (file); 1987} 1988 1989/* 1990 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1991 * encapsulation of the data subject to Mode, Structure, and Type. 1992 * 1993 * NB: Form isn't handled. 1994 */ 1995static int 1996send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1997{ 1998 int c, cp, filefd, netfd; 1999 char *buf; 2000 off_t cnt; 2001 2002 transflag++; 2003 switch (type) { 2004 2005 case TYPE_A: 2006 cp = '\0'; 2007 while ((c = getc(instr)) != EOF) { 2008 if (recvurg) 2009 goto got_oob; 2010 byte_count++; 2011 if (c == '\n' && cp != '\r') { 2012 if (ferror(outstr)) 2013 goto data_err; 2014 (void) putc('\r', outstr); 2015 } 2016 (void) putc(c, outstr); 2017 cp = c; 2018 } 2019 if (recvurg) 2020 goto got_oob; 2021 fflush(outstr); 2022 transflag = 0; 2023 if (ferror(instr)) 2024 goto file_err; 2025 if (ferror(outstr)) 2026 goto data_err; 2027 reply(226, "Transfer complete."); 2028 return (0); 2029 2030 case TYPE_I: 2031 case TYPE_L: 2032 /* 2033 * isreg is only set if we are not doing restart and we 2034 * are sending a regular file 2035 */ 2036 netfd = fileno(outstr); 2037 filefd = fileno(instr); 2038 2039 if (isreg) { 2040 2041 char *msg = "Transfer complete."; 2042 off_t offset; 2043 int err; 2044 2045 cnt = offset = 0; 2046 2047 while (filesize > 0) { 2048 err = sendfile(filefd, netfd, offset, 0, 2049 (struct sf_hdtr *) NULL, &cnt, 0); 2050 /* 2051 * Calculate byte_count before OOB processing. 2052 * It can be used in myoob() later. 2053 */ 2054 byte_count += cnt; 2055 if (recvurg) 2056 goto got_oob; 2057 offset += cnt; 2058 filesize -= cnt; 2059 2060 if (err == -1) { 2061 if (!cnt) 2062 goto oldway; 2063 2064 goto data_err; 2065 } 2066 2067 /* 2068 * We hit the EOF prematurely. 2069 * Perhaps the file was externally truncated. 2070 */ 2071 if (cnt == 0) { 2072 msg = "Transfer finished due to " 2073 "premature end of file."; 2074 break; 2075 } 2076 } 2077 2078 transflag = 0; 2079 reply(226, msg); 2080 return (0); 2081 } 2082 2083oldway: 2084 if ((buf = malloc((u_int)blksize)) == NULL) { 2085 transflag = 0; 2086 perror_reply(451, "Local resource failure: malloc"); 2087 return (-1); 2088 } 2089 2090 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 2091 write(netfd, buf, cnt) == cnt) 2092 byte_count += cnt; 2093 transflag = 0; 2094 (void)free(buf); 2095 if (cnt != 0) { 2096 if (cnt < 0) 2097 goto file_err; 2098 goto data_err; 2099 } 2100 reply(226, "Transfer complete."); 2101 return (0); 2102 default: 2103 transflag = 0; 2104 reply(550, "Unimplemented TYPE %d in send_data", type); 2105 return (-1); 2106 } 2107 2108data_err: 2109 transflag = 0; 2110 perror_reply(426, "Data connection"); 2111 return (-1); 2112 2113file_err: 2114 transflag = 0; 2115 perror_reply(551, "Error on input file"); 2116 return (-1); 2117 2118got_oob: 2119 myoob(); 2120 recvurg = 0; 2121 transflag = 0; 2122 return (-1); 2123} 2124 2125/* 2126 * Transfer data from peer to "outstr" using the appropriate encapulation of 2127 * the data subject to Mode, Structure, and Type. 2128 * 2129 * N.B.: Form isn't handled. 2130 */ 2131static int 2132receive_data(FILE *instr, FILE *outstr) 2133{ 2134 int c; 2135 int cnt, bare_lfs; 2136 char buf[BUFSIZ]; 2137 2138 transflag++; 2139 bare_lfs = 0; 2140 2141 switch (type) { 2142 2143 case TYPE_I: 2144 case TYPE_L: 2145 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 2146 if (recvurg) 2147 goto got_oob; 2148 if (write(fileno(outstr), buf, cnt) != cnt) 2149 goto file_err; 2150 byte_count += cnt; 2151 } 2152 if (recvurg) 2153 goto got_oob; 2154 if (cnt < 0) 2155 goto data_err; 2156 transflag = 0; 2157 return (0); 2158 2159 case TYPE_E: 2160 reply(553, "TYPE E not implemented."); 2161 transflag = 0; 2162 return (-1); 2163 2164 case TYPE_A: 2165 while ((c = getc(instr)) != EOF) { 2166 if (recvurg) 2167 goto got_oob; 2168 byte_count++; 2169 if (c == '\n') 2170 bare_lfs++; 2171 while (c == '\r') { 2172 if (ferror(outstr)) 2173 goto data_err; 2174 if ((c = getc(instr)) != '\n') { 2175 (void) putc ('\r', outstr); 2176 if (c == '\0' || c == EOF) 2177 goto contin2; 2178 } 2179 } 2180 (void) putc(c, outstr); 2181 contin2: ; 2182 } 2183 if (recvurg) 2184 goto got_oob; 2185 fflush(outstr); 2186 if (ferror(instr)) 2187 goto data_err; 2188 if (ferror(outstr)) 2189 goto file_err; 2190 transflag = 0; 2191 if (bare_lfs) { 2192 lreply(226, 2193 "WARNING! %d bare linefeeds received in ASCII mode", 2194 bare_lfs); 2195 (void)printf(" File may not have transferred correctly.\r\n"); 2196 } 2197 return (0); 2198 default: 2199 reply(550, "Unimplemented TYPE %d in receive_data", type); 2200 transflag = 0; 2201 return (-1); 2202 } 2203 2204data_err: 2205 transflag = 0; 2206 perror_reply(426, "Data Connection"); 2207 return (-1); 2208 2209file_err: 2210 transflag = 0; 2211 perror_reply(452, "Error writing file"); 2212 return (-1); 2213 2214got_oob: 2215 myoob(); 2216 recvurg = 0; 2217 transflag = 0; 2218 return (-1); 2219} 2220 2221void 2222statfilecmd(char *filename) 2223{ 2224 FILE *fin; 2225 int atstart; 2226 int c; 2227 char line[LINE_MAX]; 2228 2229 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2230 fin = ftpd_popen(line, "r"); 2231 lreply(211, "status of %s:", filename); 2232 atstart = 1; 2233 while ((c = getc(fin)) != EOF) { 2234 if (c == '\n') { 2235 if (ferror(stdout)){ 2236 perror_reply(421, "control connection"); 2237 (void) ftpd_pclose(fin); 2238 dologout(1); 2239 /* NOTREACHED */ 2240 } 2241 if (ferror(fin)) { 2242 perror_reply(551, filename); 2243 (void) ftpd_pclose(fin); 2244 return; 2245 } 2246 (void) putc('\r', stdout); 2247 } 2248 /* 2249 * RFC 959 says neutral text should be prepended before 2250 * a leading 3-digit number followed by whitespace, but 2251 * many ftp clients can be confused by any leading digits, 2252 * as a matter of fact. 2253 */ 2254 if (atstart && isdigit(c)) 2255 (void) putc(' ', stdout); 2256 (void) putc(c, stdout); 2257 atstart = (c == '\n'); 2258 } 2259 (void) ftpd_pclose(fin); 2260 reply(211, "End of Status"); 2261} 2262 2263void 2264statcmd(void) 2265{ 2266 union sockunion *su; 2267 u_char *a, *p; 2268 char hname[NI_MAXHOST]; 2269 int ispassive; 2270 2271 if (hostinfo) { 2272 lreply(211, "%s FTP server status:", hostname); 2273 printf(" %s\r\n", version); 2274 } else 2275 lreply(211, "FTP server status:"); 2276 printf(" Connected to %s", remotehost); 2277 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2278 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2279 if (strcmp(hname, remotehost) != 0) 2280 printf(" (%s)", hname); 2281 } 2282 printf("\r\n"); 2283 if (logged_in) { 2284 if (guest) 2285 printf(" Logged in anonymously\r\n"); 2286 else 2287 printf(" Logged in as %s\r\n", pw->pw_name); 2288 } else if (askpasswd) 2289 printf(" Waiting for password\r\n"); 2290 else 2291 printf(" Waiting for user name\r\n"); 2292 printf(" TYPE: %s", typenames[type]); 2293 if (type == TYPE_A || type == TYPE_E) 2294 printf(", FORM: %s", formnames[form]); 2295 if (type == TYPE_L) 2296#if CHAR_BIT == 8 2297 printf(" %d", CHAR_BIT); 2298#else 2299 printf(" %d", bytesize); /* need definition! */ 2300#endif 2301 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2302 strunames[stru], modenames[mode]); 2303 if (data != -1) 2304 printf(" Data connection open\r\n"); 2305 else if (pdata != -1) { 2306 ispassive = 1; 2307 su = &pasv_addr; 2308 goto printaddr; 2309 } else if (usedefault == 0) { 2310 ispassive = 0; 2311 su = &data_dest; 2312printaddr: 2313#define UC(b) (((int) b) & 0xff) 2314 if (epsvall) { 2315 printf(" EPSV only mode (EPSV ALL)\r\n"); 2316 goto epsvonly; 2317 } 2318 2319 /* PORT/PASV */ 2320 if (su->su_family == AF_INET) { 2321 a = (u_char *) &su->su_sin.sin_addr; 2322 p = (u_char *) &su->su_sin.sin_port; 2323 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2324 ispassive ? "PASV" : "PORT", 2325 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2326 UC(p[0]), UC(p[1])); 2327 } 2328 2329 /* LPRT/LPSV */ 2330 { 2331 int alen, af, i; 2332 2333 switch (su->su_family) { 2334 case AF_INET: 2335 a = (u_char *) &su->su_sin.sin_addr; 2336 p = (u_char *) &su->su_sin.sin_port; 2337 alen = sizeof(su->su_sin.sin_addr); 2338 af = 4; 2339 break; 2340 case AF_INET6: 2341 a = (u_char *) &su->su_sin6.sin6_addr; 2342 p = (u_char *) &su->su_sin6.sin6_port; 2343 alen = sizeof(su->su_sin6.sin6_addr); 2344 af = 6; 2345 break; 2346 default: 2347 af = 0; 2348 break; 2349 } 2350 if (af) { 2351 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2352 af, alen); 2353 for (i = 0; i < alen; i++) 2354 printf("%d,", UC(a[i])); 2355 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2356 } 2357 } 2358 2359epsvonly:; 2360 /* EPRT/EPSV */ 2361 { 2362 int af; 2363 2364 switch (su->su_family) { 2365 case AF_INET: 2366 af = 1; 2367 break; 2368 case AF_INET6: 2369 af = 2; 2370 break; 2371 default: 2372 af = 0; 2373 break; 2374 } 2375 if (af) { 2376 union sockunion tmp; 2377 2378 tmp = *su; 2379 if (tmp.su_family == AF_INET6) 2380 tmp.su_sin6.sin6_scope_id = 0; 2381 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2382 hname, sizeof(hname) - 1, NULL, 0, 2383 NI_NUMERICHOST)) { 2384 printf(" %s |%d|%s|%d|\r\n", 2385 ispassive ? "EPSV" : "EPRT", 2386 af, hname, htons(tmp.su_port)); 2387 } 2388 } 2389 } 2390#undef UC 2391 } else 2392 printf(" No data connection\r\n"); 2393 reply(211, "End of status"); 2394} 2395 2396void 2397fatalerror(char *s) 2398{ 2399 2400 reply(451, "Error in server: %s\n", s); 2401 reply(221, "Closing connection due to server error."); 2402 dologout(0); 2403 /* NOTREACHED */ 2404} 2405 2406void 2407reply(int n, const char *fmt, ...) 2408{ 2409 va_list ap; 2410 2411 (void)printf("%d ", n); 2412 va_start(ap, fmt); 2413 (void)vprintf(fmt, ap); 2414 va_end(ap); 2415 (void)printf("\r\n"); 2416 (void)fflush(stdout); 2417 if (ftpdebug) { 2418 syslog(LOG_DEBUG, "<--- %d ", n); 2419 va_start(ap, fmt); 2420 vsyslog(LOG_DEBUG, fmt, ap); 2421 va_end(ap); 2422 } 2423} 2424 2425void 2426lreply(int n, const char *fmt, ...) 2427{ 2428 va_list ap; 2429 2430 (void)printf("%d- ", n); 2431 va_start(ap, fmt); 2432 (void)vprintf(fmt, ap); 2433 va_end(ap); 2434 (void)printf("\r\n"); 2435 (void)fflush(stdout); 2436 if (ftpdebug) { 2437 syslog(LOG_DEBUG, "<--- %d- ", n); 2438 va_start(ap, fmt); 2439 vsyslog(LOG_DEBUG, fmt, ap); 2440 va_end(ap); 2441 } 2442} 2443 2444static void 2445ack(char *s) 2446{ 2447 2448 reply(250, "%s command successful.", s); 2449} 2450 2451void 2452nack(char *s) 2453{ 2454 2455 reply(502, "%s command not implemented.", s); 2456} 2457 2458/* ARGSUSED */ 2459void 2460yyerror(char *s) 2461{ 2462 char *cp; 2463 2464 if ((cp = strchr(cbuf,'\n'))) 2465 *cp = '\0'; 2466 reply(500, "'%s': command not understood.", cbuf); 2467} 2468 2469void 2470delete(char *name) 2471{ 2472 struct stat st; 2473 2474 LOGCMD("delete", name); 2475 if (lstat(name, &st) < 0) { 2476 perror_reply(550, name); 2477 return; 2478 } 2479 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2480 if (rmdir(name) < 0) { 2481 perror_reply(550, name); 2482 return; 2483 } 2484 goto done; 2485 } 2486 if (guest && noguestmod) { 2487 reply(550, "Operation not permitted"); 2488 return; 2489 } 2490 if (unlink(name) < 0) { 2491 perror_reply(550, name); 2492 return; 2493 } 2494done: 2495 ack("DELE"); 2496} 2497 2498void 2499cwd(char *path) 2500{ 2501 2502 if (chdir(path) < 0) 2503 perror_reply(550, path); 2504 else 2505 ack("CWD"); 2506} 2507 2508void 2509makedir(char *name) 2510{ 2511 char *s; 2512 2513 LOGCMD("mkdir", name); 2514 if (guest && noguestmkd) 2515 reply(550, "%s: permission denied", name); 2516 else if (mkdir(name, 0777) < 0) 2517 perror_reply(550, name); 2518 else { 2519 if ((s = doublequote(name)) == NULL) 2520 fatalerror("Ran out of memory."); 2521 reply(257, "\"%s\" directory created.", s); 2522 free(s); 2523 } 2524} 2525 2526void 2527removedir(char *name) 2528{ 2529 2530 LOGCMD("rmdir", name); 2531 if (rmdir(name) < 0) 2532 perror_reply(550, name); 2533 else 2534 ack("RMD"); 2535} 2536 2537void 2538pwd(void) 2539{ 2540 char *s, path[MAXPATHLEN + 1]; 2541 2542 if (getwd(path) == (char *)NULL) 2543 reply(550, "%s.", path); 2544 else { 2545 if ((s = doublequote(path)) == NULL) 2546 fatalerror("Ran out of memory."); 2547 reply(257, "\"%s\" is current directory.", s); 2548 free(s); 2549 } 2550} 2551 2552char * 2553renamefrom(char *name) 2554{ 2555 struct stat st; 2556 2557 if (guest && noguestmod) { 2558 reply(550, "Operation not permitted"); 2559 return (NULL); 2560 } 2561 if (lstat(name, &st) < 0) { 2562 perror_reply(550, name); 2563 return (NULL); 2564 } 2565 reply(350, "File exists, ready for destination name"); 2566 return (name); 2567} 2568 2569void 2570renamecmd(char *from, char *to) 2571{ 2572 struct stat st; 2573 2574 LOGCMD2("rename", from, to); 2575 2576 if (guest && (stat(to, &st) == 0)) { 2577 reply(550, "%s: permission denied", to); 2578 return; 2579 } 2580 2581 if (rename(from, to) < 0) 2582 perror_reply(550, "rename"); 2583 else 2584 ack("RNTO"); 2585} 2586 2587static void 2588dolog(struct sockaddr *who) 2589{ 2590 int error; 2591 2592 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2593 2594#ifdef SETPROCTITLE 2595#ifdef VIRTUAL_HOSTING 2596 if (thishost != firsthost) 2597 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2598 remotehost, hostname); 2599 else 2600#endif 2601 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2602 remotehost); 2603 setproctitle("%s", proctitle); 2604#endif /* SETPROCTITLE */ 2605 2606 if (logging) { 2607#ifdef VIRTUAL_HOSTING 2608 if (thishost != firsthost) 2609 syslog(LOG_INFO, "connection from %s (to %s)", 2610 remotehost, hostname); 2611 else 2612#endif 2613 { 2614 char who_name[MAXHOSTNAMELEN]; 2615 2616 error = getnameinfo(who, who->sa_len, 2617 who_name, sizeof(who_name) - 1, 2618 NULL, 0, NI_NUMERICHOST); 2619 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2620 error == 0 ? who_name : ""); 2621 } 2622 } 2623} 2624 2625/* 2626 * Record logout in wtmp file 2627 * and exit with supplied status. 2628 */ 2629void 2630dologout(int status) 2631{ 2632 /* 2633 * Prevent reception of SIGURG from resulting in a resumption 2634 * back to the main program loop. 2635 */ 2636 transflag = 0; 2637 2638 if (logged_in && dowtmp) { 2639 (void) seteuid(0); 2640 ftpd_logwtmp(ttyline, "", NULL); 2641 } 2642 /* beware of flushing buffers after a SIGPIPE */ 2643 _exit(status); 2644} 2645 2646static void 2647sigurg(int signo) 2648{ 2649 2650 recvurg = 1; 2651} 2652 2653static void 2654myoob(void) 2655{ 2656 char *cp; 2657 2658 /* only process if transfer occurring */ 2659 if (!transflag) 2660 return; 2661 cp = tmpline; 2662 if (getline(cp, 7, stdin) == NULL) { 2663 reply(221, "You could at least say goodbye."); 2664 dologout(0); 2665 } 2666 upper(cp); 2667 if (strcmp(cp, "ABOR\r\n") == 0) { 2668 tmpline[0] = '\0'; 2669 reply(426, "Transfer aborted. Data connection closed."); 2670 reply(226, "Abort successful"); 2671 } 2672 if (strcmp(cp, "STAT\r\n") == 0) { 2673 tmpline[0] = '\0'; 2674 if (file_size != -1) 2675 reply(213, "Status: %jd of %jd bytes transferred", 2676 (intmax_t)byte_count, (intmax_t)file_size); 2677 else 2678 reply(213, "Status: %jd bytes transferred", 2679 (intmax_t)byte_count); 2680 } 2681} 2682 2683/* 2684 * Note: a response of 425 is not mentioned as a possible response to 2685 * the PASV command in RFC959. However, it has been blessed as 2686 * a legitimate response by Jon Postel in a telephone conversation 2687 * with Rick Adams on 25 Jan 89. 2688 */ 2689void 2690passive(void) 2691{ 2692 int len, on; 2693 char *p, *a; 2694 2695 if (pdata >= 0) /* close old port if one set */ 2696 close(pdata); 2697 2698 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2699 if (pdata < 0) { 2700 perror_reply(425, "Can't open passive connection"); 2701 return; 2702 } 2703 on = 1; 2704 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2705 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2706 2707 (void) seteuid(0); 2708 2709#ifdef IP_PORTRANGE 2710 if (ctrl_addr.su_family == AF_INET) { 2711 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2712 : IP_PORTRANGE_DEFAULT; 2713 2714 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2715 &on, sizeof(on)) < 0) 2716 goto pasv_error; 2717 } 2718#endif 2719#ifdef IPV6_PORTRANGE 2720 if (ctrl_addr.su_family == AF_INET6) { 2721 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2722 : IPV6_PORTRANGE_DEFAULT; 2723 2724 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2725 &on, sizeof(on)) < 0) 2726 goto pasv_error; 2727 } 2728#endif 2729 2730 pasv_addr = ctrl_addr; 2731 pasv_addr.su_port = 0; 2732 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2733 goto pasv_error; 2734 2735 (void) seteuid(pw->pw_uid); 2736 2737 len = sizeof(pasv_addr); 2738 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2739 goto pasv_error; 2740 if (listen(pdata, 1) < 0) 2741 goto pasv_error; 2742 if (pasv_addr.su_family == AF_INET) 2743 a = (char *) &pasv_addr.su_sin.sin_addr; 2744 else if (pasv_addr.su_family == AF_INET6 && 2745 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2746 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2747 else 2748 goto pasv_error; 2749 2750 p = (char *) &pasv_addr.su_port; 2751 2752#define UC(b) (((int) b) & 0xff) 2753 2754 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2755 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2756 return; 2757 2758pasv_error: 2759 (void) seteuid(pw->pw_uid); 2760 (void) close(pdata); 2761 pdata = -1; 2762 perror_reply(425, "Can't open passive connection"); 2763 return; 2764} 2765 2766/* 2767 * Long Passive defined in RFC 1639. 2768 * 228 Entering Long Passive Mode 2769 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2770 */ 2771 2772void 2773long_passive(char *cmd, int pf) 2774{ 2775 int len, on; 2776 char *p, *a; 2777 2778 if (pdata >= 0) /* close old port if one set */ 2779 close(pdata); 2780 2781 if (pf != PF_UNSPEC) { 2782 if (ctrl_addr.su_family != pf) { 2783 switch (ctrl_addr.su_family) { 2784 case AF_INET: 2785 pf = 1; 2786 break; 2787 case AF_INET6: 2788 pf = 2; 2789 break; 2790 default: 2791 pf = 0; 2792 break; 2793 } 2794 /* 2795 * XXX 2796 * only EPRT/EPSV ready clients will understand this 2797 */ 2798 if (strcmp(cmd, "EPSV") == 0 && pf) { 2799 reply(522, "Network protocol mismatch, " 2800 "use (%d)", pf); 2801 } else 2802 reply(501, "Network protocol mismatch"); /*XXX*/ 2803 2804 return; 2805 } 2806 } 2807 2808 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2809 if (pdata < 0) { 2810 perror_reply(425, "Can't open passive connection"); 2811 return; 2812 } 2813 on = 1; 2814 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2815 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2816 2817 (void) seteuid(0); 2818 2819 pasv_addr = ctrl_addr; 2820 pasv_addr.su_port = 0; 2821 len = pasv_addr.su_len; 2822 2823#ifdef IP_PORTRANGE 2824 if (ctrl_addr.su_family == AF_INET) { 2825 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2826 : IP_PORTRANGE_DEFAULT; 2827 2828 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2829 &on, sizeof(on)) < 0) 2830 goto pasv_error; 2831 } 2832#endif 2833#ifdef IPV6_PORTRANGE 2834 if (ctrl_addr.su_family == AF_INET6) { 2835 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2836 : IPV6_PORTRANGE_DEFAULT; 2837 2838 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2839 &on, sizeof(on)) < 0) 2840 goto pasv_error; 2841 } 2842#endif 2843 2844 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2845 goto pasv_error; 2846 2847 (void) seteuid(pw->pw_uid); 2848 2849 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2850 goto pasv_error; 2851 if (listen(pdata, 1) < 0) 2852 goto pasv_error; 2853 2854#define UC(b) (((int) b) & 0xff) 2855 2856 if (strcmp(cmd, "LPSV") == 0) { 2857 p = (char *)&pasv_addr.su_port; 2858 switch (pasv_addr.su_family) { 2859 case AF_INET: 2860 a = (char *) &pasv_addr.su_sin.sin_addr; 2861 v4_reply: 2862 reply(228, 2863"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2864 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2865 2, UC(p[0]), UC(p[1])); 2866 return; 2867 case AF_INET6: 2868 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2869 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2870 goto v4_reply; 2871 } 2872 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2873 reply(228, 2874"Entering Long Passive Mode " 2875"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2876 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2877 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2878 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2879 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2880 2, UC(p[0]), UC(p[1])); 2881 return; 2882 } 2883 } else if (strcmp(cmd, "EPSV") == 0) { 2884 switch (pasv_addr.su_family) { 2885 case AF_INET: 2886 case AF_INET6: 2887 reply(229, "Entering Extended Passive Mode (|||%d|)", 2888 ntohs(pasv_addr.su_port)); 2889 return; 2890 } 2891 } else { 2892 /* more proper error code? */ 2893 } 2894 2895pasv_error: 2896 (void) seteuid(pw->pw_uid); 2897 (void) close(pdata); 2898 pdata = -1; 2899 perror_reply(425, "Can't open passive connection"); 2900 return; 2901} 2902 2903/* 2904 * Generate unique name for file with basename "local" 2905 * and open the file in order to avoid possible races. 2906 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2907 * Return descriptor to the file, set "name" to its name. 2908 * 2909 * Generates failure reply on error. 2910 */ 2911static int 2912guniquefd(char *local, char **name) 2913{ 2914 static char new[MAXPATHLEN]; 2915 struct stat st; 2916 char *cp; 2917 int count; 2918 int fd; 2919 2920 cp = strrchr(local, '/'); 2921 if (cp) 2922 *cp = '\0'; 2923 if (stat(cp ? local : ".", &st) < 0) { 2924 perror_reply(553, cp ? local : "."); 2925 return (-1); 2926 } 2927 if (cp) { 2928 /* 2929 * Let not overwrite dirname with counter suffix. 2930 * -4 is for /nn\0 2931 * In this extreme case dot won't be put in front of suffix. 2932 */ 2933 if (strlen(local) > sizeof(new) - 4) { 2934 reply(553, "Pathname too long"); 2935 return (-1); 2936 } 2937 *cp = '/'; 2938 } 2939 /* -4 is for the .nn<null> we put on the end below */ 2940 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2941 cp = new + strlen(new); 2942 /* 2943 * Don't generate dotfile unless requested explicitly. 2944 * This covers the case when basename gets truncated off 2945 * by buffer size. 2946 */ 2947 if (cp > new && cp[-1] != '/') 2948 *cp++ = '.'; 2949 for (count = 0; count < 100; count++) { 2950 /* At count 0 try unmodified name */ 2951 if (count) 2952 (void)sprintf(cp, "%d", count); 2953 if ((fd = open(count ? new : local, 2954 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2955 *name = count ? new : local; 2956 return (fd); 2957 } 2958 if (errno != EEXIST) { 2959 perror_reply(553, count ? new : local); 2960 return (-1); 2961 } 2962 } 2963 reply(452, "Unique file name cannot be created."); 2964 return (-1); 2965} 2966 2967/* 2968 * Format and send reply containing system error number. 2969 */ 2970void 2971perror_reply(int code, char *string) 2972{ 2973 2974 reply(code, "%s: %s.", string, strerror(errno)); 2975} 2976 2977static char *onefile[] = { 2978 "", 2979 0 2980}; 2981 2982void 2983send_file_list(char *whichf) 2984{ 2985 struct stat st; 2986 DIR *dirp = NULL; 2987 struct dirent *dir; 2988 FILE *dout = NULL; 2989 char **dirlist, *dirname; 2990 int simple = 0; 2991 int freeglob = 0; 2992 glob_t gl; 2993 2994 if (strpbrk(whichf, "~{[*?") != NULL) { 2995 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2996 2997 memset(&gl, 0, sizeof(gl)); 2998 gl.gl_matchc = MAXGLOBARGS; 2999 flags |= GLOB_LIMIT; 3000 freeglob = 1; 3001 if (glob(whichf, flags, 0, &gl)) { 3002 reply(550, "not found"); 3003 goto out; 3004 } else if (gl.gl_pathc == 0) { 3005 errno = ENOENT; 3006 perror_reply(550, whichf); 3007 goto out; 3008 } 3009 dirlist = gl.gl_pathv; 3010 } else { 3011 onefile[0] = whichf; 3012 dirlist = onefile; 3013 simple = 1; 3014 } 3015 3016 while ((dirname = *dirlist++)) { 3017 if (stat(dirname, &st) < 0) { 3018 /* 3019 * If user typed "ls -l", etc, and the client 3020 * used NLST, do what the user meant. 3021 */ 3022 if (dirname[0] == '-' && *dirlist == NULL && 3023 transflag == 0) { 3024 retrieve(_PATH_LS " %s", dirname); 3025 goto out; 3026 } 3027 perror_reply(550, whichf); 3028 if (dout != NULL) { 3029 (void) fclose(dout); 3030 transflag = 0; 3031 data = -1; 3032 pdata = -1; 3033 } 3034 goto out; 3035 } 3036 3037 if (S_ISREG(st.st_mode)) { 3038 if (dout == NULL) { 3039 dout = dataconn("file list", -1, "w"); 3040 if (dout == NULL) 3041 goto out; 3042 transflag++; 3043 } 3044 fprintf(dout, "%s%s\n", dirname, 3045 type == TYPE_A ? "\r" : ""); 3046 byte_count += strlen(dirname) + 1; 3047 continue; 3048 } else if (!S_ISDIR(st.st_mode)) 3049 continue; 3050 3051 if ((dirp = opendir(dirname)) == NULL) 3052 continue; 3053 3054 while ((dir = readdir(dirp)) != NULL) { 3055 char nbuf[MAXPATHLEN]; 3056 3057 if (recvurg) { 3058 myoob(); 3059 recvurg = 0; 3060 transflag = 0; 3061 goto out; 3062 } 3063 3064 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3065 continue; 3066 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3067 dir->d_namlen == 2) 3068 continue; 3069 3070 snprintf(nbuf, sizeof(nbuf), 3071 "%s/%s", dirname, dir->d_name); 3072 3073 /* 3074 * We have to do a stat to insure it's 3075 * not a directory or special file. 3076 */ 3077 if (simple || (stat(nbuf, &st) == 0 && 3078 S_ISREG(st.st_mode))) { 3079 if (dout == NULL) { 3080 dout = dataconn("file list", -1, "w"); 3081 if (dout == NULL) 3082 goto out; 3083 transflag++; 3084 } 3085 if (nbuf[0] == '.' && nbuf[1] == '/') 3086 fprintf(dout, "%s%s\n", &nbuf[2], 3087 type == TYPE_A ? "\r" : ""); 3088 else 3089 fprintf(dout, "%s%s\n", nbuf, 3090 type == TYPE_A ? "\r" : ""); 3091 byte_count += strlen(nbuf) + 1; 3092 } 3093 } 3094 (void) closedir(dirp); 3095 } 3096 3097 if (dout == NULL) 3098 reply(550, "No files found."); 3099 else if (ferror(dout) != 0) 3100 perror_reply(550, "Data connection"); 3101 else 3102 reply(226, "Transfer complete."); 3103 3104 transflag = 0; 3105 if (dout != NULL) 3106 (void) fclose(dout); 3107 data = -1; 3108 pdata = -1; 3109out: 3110 if (freeglob) { 3111 freeglob = 0; 3112 globfree(&gl); 3113 } 3114} 3115 3116void 3117reapchild(int signo) 3118{ 3119 while (wait3(NULL, WNOHANG, NULL) > 0); 3120} 3121 3122#ifdef OLD_SETPROCTITLE 3123/* 3124 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3125 * Warning, since this is usually started from inetd.conf, it often doesn't 3126 * have much of an environment or arglist to overwrite. 3127 */ 3128void 3129setproctitle(const char *fmt, ...) 3130{ 3131 int i; 3132 va_list ap; 3133 char *p, *bp, ch; 3134 char buf[LINE_MAX]; 3135 3136 va_start(ap, fmt); 3137 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3138 3139 /* make ps print our process name */ 3140 p = Argv[0]; 3141 *p++ = '-'; 3142 3143 i = strlen(buf); 3144 if (i > LastArgv - p - 2) { 3145 i = LastArgv - p - 2; 3146 buf[i] = '\0'; 3147 } 3148 bp = buf; 3149 while (ch = *bp++) 3150 if (ch != '\n' && ch != '\r') 3151 *p++ = ch; 3152 while (p < LastArgv) 3153 *p++ = ' '; 3154} 3155#endif /* OLD_SETPROCTITLE */ 3156 3157static void 3158logxfer(char *name, off_t size, time_t start) 3159{ 3160 char buf[1024]; 3161 char path[MAXPATHLEN + 1]; 3162 time_t now; 3163 3164 if (statfd >= 0 && getwd(path) != NULL) { 3165 time(&now); 3166 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n", 3167 ctime(&now)+4, ident, remotehost, 3168 path, name, (long long)size, 3169 (long)(now - start + (now == start))); 3170 write(statfd, buf, strlen(buf)); 3171 } 3172} 3173 3174static char * 3175doublequote(char *s) 3176{ 3177 int n; 3178 char *p, *s2; 3179 3180 for (p = s, n = 0; *p; p++) 3181 if (*p == '"') 3182 n++; 3183 3184 if ((s2 = malloc(p - s + n + 1)) == NULL) 3185 return (NULL); 3186 3187 for (p = s2; *s; s++, p++) { 3188 if ((*p = *s) == '"') 3189 *(++p) = '"'; 3190 } 3191 *p = '\0'; 3192 3193 return (s2); 3194} 3195 3196/* setup server socket for specified address family */ 3197/* if af is PF_UNSPEC more than one socket may be returned */ 3198/* the returned list is dynamically allocated, so caller needs to free it */ 3199static int * 3200socksetup(int af, char *bindname, const char *bindport) 3201{ 3202 struct addrinfo hints, *res, *r; 3203 int error, maxs, *s, *socks; 3204 const int on = 1; 3205 3206 memset(&hints, 0, sizeof(hints)); 3207 hints.ai_flags = AI_PASSIVE; 3208 hints.ai_family = af; 3209 hints.ai_socktype = SOCK_STREAM; 3210 error = getaddrinfo(bindname, bindport, &hints, &res); 3211 if (error) { 3212 syslog(LOG_ERR, "%s", gai_strerror(error)); 3213 if (error == EAI_SYSTEM) 3214 syslog(LOG_ERR, "%s", strerror(errno)); 3215 return NULL; 3216 } 3217 3218 /* Count max number of sockets we may open */ 3219 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3220 ; 3221 socks = malloc((maxs + 1) * sizeof(int)); 3222 if (!socks) { 3223 freeaddrinfo(res); 3224 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3225 return NULL; 3226 } 3227 3228 *socks = 0; /* num of sockets counter at start of array */ 3229 s = socks + 1; 3230 for (r = res; r; r = r->ai_next) { 3231 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3232 if (*s < 0) { 3233 syslog(LOG_DEBUG, "control socket: %m"); 3234 continue; 3235 } 3236 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3237 &on, sizeof(on)) < 0) 3238 syslog(LOG_WARNING, 3239 "control setsockopt (SO_REUSEADDR): %m"); 3240 if (r->ai_family == AF_INET6) { 3241 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3242 &on, sizeof(on)) < 0) 3243 syslog(LOG_WARNING, 3244 "control setsockopt (IPV6_V6ONLY): %m"); 3245 } 3246 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3247 syslog(LOG_DEBUG, "control bind: %m"); 3248 close(*s); 3249 continue; 3250 } 3251 (*socks)++; 3252 s++; 3253 } 3254 3255 if (res) 3256 freeaddrinfo(res); 3257 3258 if (*socks == 0) { 3259 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3260 free(socks); 3261 return NULL; 3262 } 3263 return(socks); 3264} 3265