ftpd.c revision 132894
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 132894 2004-07-30 17:30:07Z 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 <stdio.h> 84#include <stdlib.h> 85#include <string.h> 86#include <syslog.h> 87#include <time.h> 88#include <unistd.h> 89#include <libutil.h> 90#ifdef LOGIN_CAP 91#include <login_cap.h> 92#endif 93 94#ifdef USE_PAM 95#include <security/pam_appl.h> 96#endif 97 98#include "pathnames.h" 99#include "extern.h" 100 101#include <stdarg.h> 102 103static char version[] = "Version 6.00LS"; 104#undef main 105 106extern off_t restart_point; 107extern char cbuf[]; 108 109union sockunion ctrl_addr; 110union sockunion data_source; 111union sockunion data_dest; 112union sockunion his_addr; 113union sockunion pasv_addr; 114 115int daemon_mode; 116int data; 117int dataport; 118int hostinfo = 1; /* print host-specific info in messages */ 119int logged_in; 120struct passwd *pw; 121char *homedir; 122int ftpdebug; 123int timeout = 900; /* timeout after 15 minutes of inactivity */ 124int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 125int logging; 126int restricted_data_ports = 1; 127int paranoid = 1; /* be extra careful about security */ 128int anon_only = 0; /* Only anonymous ftp allowed */ 129int guest; 130int dochroot; 131int dowtmp = 1; 132int stats; 133int statfd = -1; 134int type; 135int form; 136int stru; /* avoid C keyword */ 137int mode; 138int usedefault = 1; /* for data transfers */ 139int pdata = -1; /* for passive mode */ 140int readonly=0; /* Server is in readonly mode. */ 141int noepsv=0; /* EPSV command is disabled. */ 142int noretr=0; /* RETR command is disabled. */ 143int noguestretr=0; /* RETR command is disabled for anon users. */ 144int noguestmkd=0; /* MKD command is disabled for anon users. */ 145int noguestmod=1; /* anon users may not modify existing files. */ 146 147static volatile sig_atomic_t recvurg; 148sig_atomic_t transflag; 149off_t file_size; 150off_t byte_count; 151#if !defined(CMASK) || CMASK == 0 152#undef CMASK 153#define CMASK 027 154#endif 155int defumask = CMASK; /* default umask value */ 156char tmpline[7]; 157char *hostname; 158int epsvall = 0; 159 160#ifdef VIRTUAL_HOSTING 161char *ftpuser; 162 163static struct ftphost { 164 struct ftphost *next; 165 struct addrinfo *hostinfo; 166 char *hostname; 167 char *anonuser; 168 char *statfile; 169 char *welcome; 170 char *loginmsg; 171} *thishost, *firsthost; 172 173#endif 174char remotehost[MAXHOSTNAMELEN]; 175char *ident = NULL; 176 177static char ttyline[20]; 178char *tty = ttyline; /* for klogin */ 179 180#ifdef USE_PAM 181static int auth_pam(struct passwd**, const char*); 182pam_handle_t *pamh = NULL; 183#endif 184 185static struct opie opiedata; 186static char opieprompt[OPIE_CHALLENGE_MAX+1]; 187static int pwok; 188 189char *pid_file = NULL; 190 191/* 192 * Limit number of pathnames that glob can return. 193 * A limit of 0 indicates the number of pathnames is unlimited. 194 */ 195#define MAXGLOBARGS 16384 196# 197 198/* 199 * Timeout intervals for retrying connections 200 * to hosts that don't accept PORT cmds. This 201 * is a kludge, but given the problems with TCP... 202 */ 203#define SWAITMAX 90 /* wait at most 90 seconds */ 204#define SWAITINT 5 /* interval between retries */ 205 206int swaitmax = SWAITMAX; 207int swaitint = SWAITINT; 208 209#ifdef SETPROCTITLE 210#ifdef OLD_SETPROCTITLE 211char **Argv = NULL; /* pointer to argument vector */ 212char *LastArgv = NULL; /* end of argv */ 213#endif /* OLD_SETPROCTITLE */ 214char proctitle[LINE_MAX]; /* initial part of title */ 215#endif /* SETPROCTITLE */ 216 217#define LOGCMD(cmd, file) \ 218 if (logging > 1) \ 219 syslog(LOG_INFO,"%s %s%s", cmd, \ 220 *(file) == '/' ? "" : curdir(), file); 221#define LOGCMD2(cmd, file1, file2) \ 222 if (logging > 1) \ 223 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 224 *(file1) == '/' ? "" : curdir(), file1, \ 225 *(file2) == '/' ? "" : curdir(), file2); 226#define LOGBYTES(cmd, file, cnt) \ 227 if (logging > 1) { \ 228 if (cnt == (off_t)-1) \ 229 syslog(LOG_INFO,"%s %s%s", cmd, \ 230 *(file) == '/' ? "" : curdir(), file); \ 231 else \ 232 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 233 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 234 } 235 236#ifdef VIRTUAL_HOSTING 237static void inithosts(void); 238static void selecthost(union sockunion *); 239#endif 240static void ack(char *); 241static void sigurg(int); 242static void myoob(void); 243static int checkuser(char *, char *, int, char **); 244static FILE *dataconn(char *, off_t, char *); 245static void dolog(struct sockaddr *); 246static char *curdir(void); 247static void end_login(void); 248static FILE *getdatasock(char *); 249static int guniquefd(char *, char **); 250static void lostconn(int); 251static void sigquit(int); 252static int receive_data(FILE *, FILE *); 253static int send_data(FILE *, FILE *, off_t, off_t, int); 254static struct passwd * 255 sgetpwnam(char *); 256static char *sgetsave(char *); 257static void reapchild(int); 258static void logxfer(char *, off_t, time_t); 259static char *doublequote(char *); 260static int *socksetup(int, char *, const char *); 261 262static char * 263curdir(void) 264{ 265 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 266 267 if (getcwd(path, sizeof(path)-2) == NULL) 268 return (""); 269 if (path[1] != '\0') /* special case for root dir. */ 270 strcat(path, "/"); 271 /* For guest account, skip / since it's chrooted */ 272 return (guest ? path+1 : path); 273} 274 275int 276main(int argc, char *argv[], char **envp) 277{ 278 int addrlen, ch, on = 1, tos; 279 char *cp, line[LINE_MAX]; 280 FILE *fd; 281 int error; 282 char *bindname = NULL; 283 const char *bindport = "ftp"; 284 int family = AF_UNSPEC; 285 struct sigaction sa; 286 287 tzset(); /* in case no timezone database in ~ftp */ 288 sigemptyset(&sa.sa_mask); 289 sa.sa_flags = SA_RESTART; 290 291#ifdef OLD_SETPROCTITLE 292 /* 293 * Save start and extent of argv for setproctitle. 294 */ 295 Argv = argv; 296 while (*envp) 297 envp++; 298 LastArgv = envp[-1] + strlen(envp[-1]); 299#endif /* OLD_SETPROCTITLE */ 300 301 302 while ((ch = getopt(argc, argv, 303 "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 304 switch (ch) { 305 case '4': 306 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 307 break; 308 309 case '6': 310 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 311 break; 312 313 case 'a': 314 bindname = optarg; 315 break; 316 317 case 'A': 318 anon_only = 1; 319 break; 320 321 case 'd': 322 ftpdebug++; 323 break; 324 325 case 'D': 326 daemon_mode++; 327 break; 328 329 case 'E': 330 noepsv = 1; 331 break; 332 333 case 'h': 334 hostinfo = 0; 335 break; 336 337 case 'l': 338 logging++; /* > 1 == extra logging */ 339 break; 340 341 case 'm': 342 noguestmod = 0; 343 break; 344 345 case 'M': 346 noguestmkd = 1; 347 break; 348 349 case 'o': 350 noretr = 1; 351 break; 352 353 case 'O': 354 noguestretr = 1; 355 break; 356 357 case 'p': 358 pid_file = optarg; 359 break; 360 361 case 'P': 362 bindport = optarg; 363 break; 364 365 case 'r': 366 readonly = 1; 367 break; 368 369 case 'R': 370 paranoid = 0; 371 break; 372 373 case 'S': 374 stats++; 375 break; 376 377 case 't': 378 timeout = atoi(optarg); 379 if (maxtimeout < timeout) 380 maxtimeout = timeout; 381 break; 382 383 case 'T': 384 maxtimeout = atoi(optarg); 385 if (timeout > maxtimeout) 386 timeout = maxtimeout; 387 break; 388 389 case 'u': 390 { 391 long val = 0; 392 393 val = strtol(optarg, &optarg, 8); 394 if (*optarg != '\0' || val < 0) 395 warnx("bad value for -u"); 396 else 397 defumask = val; 398 break; 399 } 400 case 'U': 401 restricted_data_ports = 0; 402 break; 403 404 case 'v': 405 ftpdebug++; 406 break; 407 408 case 'W': 409 dowtmp = 0; 410 break; 411 412 default: 413 warnx("unknown flag -%c ignored", optopt); 414 break; 415 } 416 } 417 418#ifdef VIRTUAL_HOSTING 419 inithosts(); 420#endif 421 (void) freopen(_PATH_DEVNULL, "w", stderr); 422 423 /* 424 * LOG_NDELAY sets up the logging connection immediately, 425 * necessary for anonymous ftp's that chroot and can't do it later. 426 */ 427 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 428 429 if (daemon_mode) { 430 int *ctl_sock, fd, maxfd = -1, nfds, i; 431 fd_set defreadfds, readfds; 432 pid_t pid; 433 434 /* 435 * Detach from parent. 436 */ 437 if (daemon(1, 1) < 0) { 438 syslog(LOG_ERR, "failed to become a daemon"); 439 exit(1); 440 } 441 sa.sa_handler = reapchild; 442 (void)sigaction(SIGCHLD, &sa, NULL); 443 444 /* 445 * Open a socket, bind it to the FTP port, and start 446 * listening. 447 */ 448 ctl_sock = socksetup(family, bindname, bindport); 449 if (ctl_sock == NULL) 450 exit(1); 451 452 FD_ZERO(&defreadfds); 453 for (i = 1; i <= *ctl_sock; i++) { 454 FD_SET(ctl_sock[i], &defreadfds); 455 if (listen(ctl_sock[i], 32) < 0) { 456 syslog(LOG_ERR, "control listen: %m"); 457 exit(1); 458 } 459 if (maxfd < ctl_sock[i]) 460 maxfd = ctl_sock[i]; 461 } 462 463 /* 464 * Atomically write process ID 465 */ 466 if (pid_file) 467 { 468 int fd; 469 char buf[20]; 470 471 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 472 | O_NONBLOCK | O_EXLOCK, 0644); 473 if (fd < 0) { 474 if (errno == EAGAIN) 475 errx(1, "%s: file locked", pid_file); 476 else 477 err(1, "%s", pid_file); 478 } 479 snprintf(buf, sizeof(buf), 480 "%lu\n", (unsigned long) getpid()); 481 if (write(fd, buf, strlen(buf)) < 0) 482 err(1, "%s: write", pid_file); 483 /* Leave the pid file open and locked */ 484 } 485 /* 486 * Loop forever accepting connection requests and forking off 487 * children to handle them. 488 */ 489 while (1) { 490 FD_COPY(&defreadfds, &readfds); 491 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 492 if (nfds <= 0) { 493 if (nfds < 0 && errno != EINTR) 494 syslog(LOG_WARNING, "select: %m"); 495 continue; 496 } 497 498 pid = -1; 499 for (i = 1; i <= *ctl_sock; i++) 500 if (FD_ISSET(ctl_sock[i], &readfds)) { 501 addrlen = sizeof(his_addr); 502 fd = accept(ctl_sock[i], 503 (struct sockaddr *)&his_addr, 504 &addrlen); 505 if ((pid = fork()) == 0) { 506 /* child */ 507 (void) dup2(fd, 0); 508 (void) dup2(fd, 1); 509 close(ctl_sock[i]); 510 } else 511 close(fd); 512 } 513 if (pid == 0) 514 break; 515 } 516 } else { 517 addrlen = sizeof(his_addr); 518 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 519 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 520 exit(1); 521 } 522 } 523 524 sa.sa_handler = SIG_DFL; 525 (void)sigaction(SIGCHLD, &sa, NULL); 526 527 sa.sa_handler = sigurg; 528 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 529 (void)sigaction(SIGURG, &sa, NULL); 530 531 sigfillset(&sa.sa_mask); /* block all signals in handler */ 532 sa.sa_flags = SA_RESTART; 533 sa.sa_handler = sigquit; 534 (void)sigaction(SIGHUP, &sa, NULL); 535 (void)sigaction(SIGINT, &sa, NULL); 536 (void)sigaction(SIGQUIT, &sa, NULL); 537 (void)sigaction(SIGTERM, &sa, NULL); 538 539 sa.sa_handler = lostconn; 540 (void)sigaction(SIGPIPE, &sa, NULL); 541 542 addrlen = sizeof(ctrl_addr); 543 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 544 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 545 exit(1); 546 } 547 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 548#ifdef VIRTUAL_HOSTING 549 /* select our identity from virtual host table */ 550 selecthost(&ctrl_addr); 551#endif 552#ifdef IP_TOS 553 if (ctrl_addr.su_family == AF_INET) 554 { 555 tos = IPTOS_LOWDELAY; 556 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 557 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 558 } 559#endif 560 /* 561 * Disable Nagle on the control channel so that we don't have to wait 562 * for peer's ACK before issuing our next reply. 563 */ 564 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 565 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 566 567 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 568 569 /* set this here so klogin can use it... */ 570 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 571 572 /* Try to handle urgent data inline */ 573#ifdef SO_OOBINLINE 574 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 575 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 576#endif 577 578#ifdef F_SETOWN 579 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 580 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 581#endif 582 dolog((struct sockaddr *)&his_addr); 583 /* 584 * Set up default state 585 */ 586 data = -1; 587 type = TYPE_A; 588 form = FORM_N; 589 stru = STRU_F; 590 mode = MODE_S; 591 tmpline[0] = '\0'; 592 593 /* If logins are disabled, print out the message. */ 594 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 595 while (fgets(line, sizeof(line), fd) != NULL) { 596 if ((cp = strchr(line, '\n')) != NULL) 597 *cp = '\0'; 598 lreply(530, "%s", line); 599 } 600 (void) fflush(stdout); 601 (void) fclose(fd); 602 reply(530, "System not available."); 603 exit(0); 604 } 605#ifdef VIRTUAL_HOSTING 606 fd = fopen(thishost->welcome, "r"); 607#else 608 fd = fopen(_PATH_FTPWELCOME, "r"); 609#endif 610 if (fd != NULL) { 611 while (fgets(line, sizeof(line), fd) != NULL) { 612 if ((cp = strchr(line, '\n')) != NULL) 613 *cp = '\0'; 614 lreply(220, "%s", line); 615 } 616 (void) fflush(stdout); 617 (void) fclose(fd); 618 /* reply(220,) must follow */ 619 } 620#ifndef VIRTUAL_HOSTING 621 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 622 fatalerror("Ran out of memory."); 623 (void) gethostname(hostname, MAXHOSTNAMELEN - 1); 624 hostname[MAXHOSTNAMELEN - 1] = '\0'; 625#endif 626 if (hostinfo) 627 reply(220, "%s FTP server (%s) ready.", hostname, version); 628 else 629 reply(220, "FTP server ready."); 630 for (;;) 631 (void) yyparse(); 632 /* NOTREACHED */ 633} 634 635static void 636lostconn(int signo) 637{ 638 639 if (ftpdebug) 640 syslog(LOG_DEBUG, "lost connection"); 641 dologout(1); 642} 643 644static void 645sigquit(int signo) 646{ 647 648 syslog(LOG_ERR, "got signal %d", signo); 649 dologout(1); 650} 651 652#ifdef VIRTUAL_HOSTING 653/* 654 * read in virtual host tables (if they exist) 655 */ 656 657static void 658inithosts(void) 659{ 660 int insert; 661 size_t len; 662 FILE *fp; 663 char *cp, *mp, *line; 664 char *hostname; 665 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 666 struct ftphost *hrp, *lhrp; 667 struct addrinfo hints, *res, *ai; 668 669 /* 670 * Fill in the default host information 671 */ 672 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 673 fatalerror("Ran out of memory."); 674 if (gethostname(hostname, MAXHOSTNAMELEN) < 0) 675 hostname[0] = '\0'; 676 hostname[MAXHOSTNAMELEN - 1] = '\0'; 677 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 678 fatalerror("Ran out of memory."); 679 hrp->hostname = hostname; 680 hrp->hostinfo = NULL; 681 682 memset(&hints, 0, sizeof(hints)); 683 hints.ai_flags = AI_CANONNAME; 684 hints.ai_family = AF_UNSPEC; 685 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 686 hrp->hostinfo = res; 687 hrp->statfile = _PATH_FTPDSTATFILE; 688 hrp->welcome = _PATH_FTPWELCOME; 689 hrp->loginmsg = _PATH_FTPLOGINMESG; 690 hrp->anonuser = "ftp"; 691 hrp->next = NULL; 692 thishost = firsthost = lhrp = hrp; 693 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 694 int addrsize, gothost; 695 void *addr; 696 struct hostent *hp; 697 698 while ((line = fgetln(fp, &len)) != NULL) { 699 int i, hp_error; 700 701 /* skip comments */ 702 if (line[0] == '#') 703 continue; 704 if (line[len - 1] == '\n') { 705 line[len - 1] = '\0'; 706 mp = NULL; 707 } else { 708 if ((mp = malloc(len + 1)) == NULL) 709 fatalerror("Ran out of memory."); 710 memcpy(mp, line, len); 711 mp[len] = '\0'; 712 line = mp; 713 } 714 cp = strtok(line, " \t"); 715 /* skip empty lines */ 716 if (cp == NULL) 717 goto nextline; 718 vhost = cp; 719 720 /* set defaults */ 721 anonuser = "ftp"; 722 statfile = _PATH_FTPDSTATFILE; 723 welcome = _PATH_FTPWELCOME; 724 loginmsg = _PATH_FTPLOGINMESG; 725 726 /* 727 * Preparse the line so we can use its info 728 * for all the addresses associated with 729 * the virtual host name. 730 * Field 0, the virtual host name, is special: 731 * it's already parsed off and will be strdup'ed 732 * later, after we know its canonical form. 733 */ 734 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 735 if (*cp != '-' && (cp = strdup(cp))) 736 switch (i) { 737 case 1: /* anon user permissions */ 738 anonuser = cp; 739 break; 740 case 2: /* statistics file */ 741 statfile = cp; 742 break; 743 case 3: /* welcome message */ 744 welcome = cp; 745 break; 746 case 4: /* login message */ 747 loginmsg = cp; 748 break; 749 default: /* programming error */ 750 abort(); 751 /* NOTREACHED */ 752 } 753 754 hints.ai_flags = 0; 755 hints.ai_family = AF_UNSPEC; 756 hints.ai_flags = AI_PASSIVE; 757 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 758 goto nextline; 759 for (ai = res; ai != NULL && ai->ai_addr != NULL; 760 ai = ai->ai_next) { 761 762 gothost = 0; 763 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 764 struct addrinfo *hi; 765 766 for (hi = hrp->hostinfo; hi != NULL; 767 hi = hi->ai_next) 768 if (hi->ai_addrlen == ai->ai_addrlen && 769 memcmp(hi->ai_addr, 770 ai->ai_addr, 771 ai->ai_addr->sa_len) == 0) { 772 gothost++; 773 break; 774 } 775 if (gothost) 776 break; 777 } 778 if (hrp == NULL) { 779 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 780 goto nextline; 781 hrp->hostname = NULL; 782 insert = 1; 783 } else { 784 if (hrp->hostinfo && hrp->hostinfo != res) 785 freeaddrinfo(hrp->hostinfo); 786 insert = 0; /* host already in the chain */ 787 } 788 hrp->hostinfo = res; 789 790 /* 791 * determine hostname to use. 792 * force defined name if there is a valid alias 793 * otherwise fallback to primary hostname 794 */ 795 /* XXX: getaddrinfo() can't do alias check */ 796 switch(hrp->hostinfo->ai_family) { 797 case AF_INET: 798 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 799 addrsize = sizeof(struct in_addr); 800 break; 801 case AF_INET6: 802 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 803 addrsize = sizeof(struct in6_addr); 804 break; 805 default: 806 /* should not reach here */ 807 freeaddrinfo(hrp->hostinfo); 808 if (insert) 809 free(hrp); /*not in chain, can free*/ 810 else 811 hrp->hostinfo = NULL; /*mark as blank*/ 812 goto nextline; 813 /* NOTREACHED */ 814 } 815 if ((hp = getipnodebyaddr(addr, addrsize, 816 hrp->hostinfo->ai_family, 817 &hp_error)) != NULL) { 818 if (strcmp(vhost, hp->h_name) != 0) { 819 if (hp->h_aliases == NULL) 820 vhost = hp->h_name; 821 else { 822 i = 0; 823 while (hp->h_aliases[i] && 824 strcmp(vhost, hp->h_aliases[i]) != 0) 825 ++i; 826 if (hp->h_aliases[i] == NULL) 827 vhost = hp->h_name; 828 } 829 } 830 } 831 if (hrp->hostname && 832 strcmp(hrp->hostname, vhost) != 0) { 833 free(hrp->hostname); 834 hrp->hostname = NULL; 835 } 836 if (hrp->hostname == NULL && 837 (hrp->hostname = strdup(vhost)) == NULL) { 838 freeaddrinfo(hrp->hostinfo); 839 hrp->hostinfo = NULL; /* mark as blank */ 840 if (hp) 841 freehostent(hp); 842 goto nextline; 843 } 844 hrp->anonuser = anonuser; 845 hrp->statfile = statfile; 846 hrp->welcome = welcome; 847 hrp->loginmsg = loginmsg; 848 if (insert) { 849 hrp->next = NULL; 850 lhrp->next = hrp; 851 lhrp = hrp; 852 } 853 if (hp) 854 freehostent(hp); 855 } 856nextline: 857 if (mp) 858 free(mp); 859 } 860 (void) fclose(fp); 861 } 862} 863 864static void 865selecthost(union sockunion *su) 866{ 867 struct ftphost *hrp; 868 u_int16_t port; 869#ifdef INET6 870 struct in6_addr *mapped_in6 = NULL; 871#endif 872 struct addrinfo *hi; 873 874#ifdef INET6 875 /* 876 * XXX IPv4 mapped IPv6 addr consideraton, 877 * specified in rfc2373. 878 */ 879 if (su->su_family == AF_INET6 && 880 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 881 mapped_in6 = &su->su_sin6.sin6_addr; 882#endif 883 884 hrp = thishost = firsthost; /* default */ 885 port = su->su_port; 886 su->su_port = 0; 887 while (hrp != NULL) { 888 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 889 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 890 thishost = hrp; 891 break; 892 } 893#ifdef INET6 894 /* XXX IPv4 mapped IPv6 addr consideraton */ 895 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 896 (memcmp(&mapped_in6->s6_addr[12], 897 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 898 sizeof(struct in_addr)) == 0)) { 899 thishost = hrp; 900 break; 901 } 902#endif 903 } 904 hrp = hrp->next; 905 } 906 su->su_port = port; 907 /* setup static variables as appropriate */ 908 hostname = thishost->hostname; 909 ftpuser = thishost->anonuser; 910} 911#endif 912 913/* 914 * Helper function for sgetpwnam(). 915 */ 916static char * 917sgetsave(char *s) 918{ 919 char *new = malloc((unsigned) strlen(s) + 1); 920 921 if (new == NULL) { 922 perror_reply(421, "Local resource failure: malloc"); 923 dologout(1); 924 /* NOTREACHED */ 925 } 926 (void) strcpy(new, s); 927 return (new); 928} 929 930/* 931 * Save the result of a getpwnam. Used for USER command, since 932 * the data returned must not be clobbered by any other command 933 * (e.g., globbing). 934 */ 935static struct passwd * 936sgetpwnam(char *name) 937{ 938 static struct passwd save; 939 struct passwd *p; 940 941 if ((p = getpwnam(name)) == NULL) 942 return (p); 943 if (save.pw_name) { 944 free(save.pw_name); 945 free(save.pw_passwd); 946 free(save.pw_gecos); 947 free(save.pw_dir); 948 free(save.pw_shell); 949 } 950 save = *p; 951 save.pw_name = sgetsave(p->pw_name); 952 save.pw_passwd = sgetsave(p->pw_passwd); 953 save.pw_gecos = sgetsave(p->pw_gecos); 954 save.pw_dir = sgetsave(p->pw_dir); 955 save.pw_shell = sgetsave(p->pw_shell); 956 return (&save); 957} 958 959static int login_attempts; /* number of failed login attempts */ 960static int askpasswd; /* had user command, ask for passwd */ 961static char curname[MAXLOGNAME]; /* current USER name */ 962 963/* 964 * USER command. 965 * Sets global passwd pointer pw if named account exists and is acceptable; 966 * sets askpasswd if a PASS command is expected. If logged in previously, 967 * need to reset state. If name is "ftp" or "anonymous", the name is not in 968 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 969 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 970 * requesting login privileges. Disallow anyone who does not have a standard 971 * shell as returned by getusershell(). Disallow anyone mentioned in the file 972 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 973 */ 974void 975user(char *name) 976{ 977 char *cp, *shell; 978 979 if (logged_in) { 980 if (guest) { 981 reply(530, "Can't change user from guest login."); 982 return; 983 } else if (dochroot) { 984 reply(530, "Can't change user from chroot user."); 985 return; 986 } 987 end_login(); 988 } 989 990 guest = 0; 991#ifdef VIRTUAL_HOSTING 992 pw = sgetpwnam(thishost->anonuser); 993#else 994 pw = sgetpwnam("ftp"); 995#endif 996 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 997 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 998 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 999 reply(530, "User %s access denied.", name); 1000 else if (pw != NULL) { 1001 guest = 1; 1002 askpasswd = 1; 1003 reply(331, 1004 "Guest login ok, send your email address as password."); 1005 } else 1006 reply(530, "User %s unknown.", name); 1007 if (!askpasswd && logging) 1008 syslog(LOG_NOTICE, 1009 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1010 return; 1011 } 1012 if (anon_only != 0) { 1013 reply(530, "Sorry, only anonymous ftp allowed."); 1014 return; 1015 } 1016 1017 if ((pw = sgetpwnam(name))) { 1018 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1019 shell = _PATH_BSHELL; 1020 setusershell(); 1021 while ((cp = getusershell()) != NULL) 1022 if (strcmp(cp, shell) == 0) 1023 break; 1024 endusershell(); 1025 1026 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1027 reply(530, "User %s access denied.", name); 1028 if (logging) 1029 syslog(LOG_NOTICE, 1030 "FTP LOGIN REFUSED FROM %s, %s", 1031 remotehost, name); 1032 pw = (struct passwd *) NULL; 1033 return; 1034 } 1035 } 1036 if (logging) 1037 strncpy(curname, name, sizeof(curname)-1); 1038 1039 pwok = 0; 1040#ifdef USE_PAM 1041 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1042#endif 1043 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1044 pwok = (pw != NULL) && 1045 opieaccessfile(remotehost) && 1046 opiealways(pw->pw_dir); 1047 reply(331, "Response to %s %s for %s.", 1048 opieprompt, pwok ? "requested" : "required", name); 1049 } else { 1050 pwok = 1; 1051 reply(331, "Password required for %s.", name); 1052 } 1053 askpasswd = 1; 1054 /* 1055 * Delay before reading passwd after first failed 1056 * attempt to slow down passwd-guessing programs. 1057 */ 1058 if (login_attempts) 1059 sleep((unsigned) login_attempts); 1060} 1061 1062/* 1063 * Check if a user is in the file "fname", 1064 * return a pointer to a malloc'd string with the rest 1065 * of the matching line in "residue" if not NULL. 1066 */ 1067static int 1068checkuser(char *fname, char *name, int pwset, char **residue) 1069{ 1070 FILE *fd; 1071 int found = 0; 1072 size_t len; 1073 char *line, *mp, *p; 1074 1075 if ((fd = fopen(fname, "r")) != NULL) { 1076 while (!found && (line = fgetln(fd, &len)) != NULL) { 1077 /* skip comments */ 1078 if (line[0] == '#') 1079 continue; 1080 if (line[len - 1] == '\n') { 1081 line[len - 1] = '\0'; 1082 mp = NULL; 1083 } else { 1084 if ((mp = malloc(len + 1)) == NULL) 1085 fatalerror("Ran out of memory."); 1086 memcpy(mp, line, len); 1087 mp[len] = '\0'; 1088 line = mp; 1089 } 1090 /* avoid possible leading and trailing whitespace */ 1091 p = strtok(line, " \t"); 1092 /* skip empty lines */ 1093 if (p == NULL) 1094 goto nextline; 1095 /* 1096 * if first chr is '@', check group membership 1097 */ 1098 if (p[0] == '@') { 1099 int i = 0; 1100 struct group *grp; 1101 1102 if (p[1] == '\0') /* single @ matches anyone */ 1103 found = 1; 1104 else { 1105 if ((grp = getgrnam(p+1)) == NULL) 1106 goto nextline; 1107 /* 1108 * Check user's default group 1109 */ 1110 if (pwset && grp->gr_gid == pw->pw_gid) 1111 found = 1; 1112 /* 1113 * Check supplementary groups 1114 */ 1115 while (!found && grp->gr_mem[i]) 1116 found = strcmp(name, 1117 grp->gr_mem[i++]) 1118 == 0; 1119 } 1120 } 1121 /* 1122 * Otherwise, just check for username match 1123 */ 1124 else 1125 found = strcmp(p, name) == 0; 1126 /* 1127 * Save the rest of line to "residue" if matched 1128 */ 1129 if (found && residue) { 1130 if ((p = strtok(NULL, "")) != NULL) 1131 p += strspn(p, " \t"); 1132 if (p && *p) { 1133 if ((*residue = strdup(p)) == NULL) 1134 fatalerror("Ran out of memory."); 1135 } else 1136 *residue = NULL; 1137 } 1138nextline: 1139 if (mp) 1140 free(mp); 1141 } 1142 (void) fclose(fd); 1143 } 1144 return (found); 1145} 1146 1147/* 1148 * Terminate login as previous user, if any, resetting state; 1149 * used when USER command is given or login fails. 1150 */ 1151static void 1152end_login(void) 1153{ 1154#ifdef USE_PAM 1155 int e; 1156#endif 1157 1158 (void) seteuid(0); 1159 if (logged_in && dowtmp) 1160 ftpd_logwtmp(ttyline, "", NULL); 1161 pw = NULL; 1162#ifdef LOGIN_CAP 1163 setusercontext(NULL, getpwuid(0), 0, 1164 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1165 LOGIN_SETMAC); 1166#endif 1167#ifdef USE_PAM 1168 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1169 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1170 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1171 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1172 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1173 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1174 pamh = NULL; 1175#endif 1176 logged_in = 0; 1177 guest = 0; 1178 dochroot = 0; 1179} 1180 1181#ifdef USE_PAM 1182 1183/* 1184 * the following code is stolen from imap-uw PAM authentication module and 1185 * login.c 1186 */ 1187#define COPY_STRING(s) (s ? strdup(s) : NULL) 1188 1189struct cred_t { 1190 const char *uname; /* user name */ 1191 const char *pass; /* password */ 1192}; 1193typedef struct cred_t cred_t; 1194 1195static int 1196auth_conv(int num_msg, const struct pam_message **msg, 1197 struct pam_response **resp, void *appdata) 1198{ 1199 int i; 1200 cred_t *cred = (cred_t *) appdata; 1201 struct pam_response *reply; 1202 1203 reply = calloc(num_msg, sizeof *reply); 1204 if (reply == NULL) 1205 return PAM_BUF_ERR; 1206 1207 for (i = 0; i < num_msg; i++) { 1208 switch (msg[i]->msg_style) { 1209 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1210 reply[i].resp_retcode = PAM_SUCCESS; 1211 reply[i].resp = COPY_STRING(cred->uname); 1212 /* PAM frees resp. */ 1213 break; 1214 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1215 reply[i].resp_retcode = PAM_SUCCESS; 1216 reply[i].resp = COPY_STRING(cred->pass); 1217 /* PAM frees resp. */ 1218 break; 1219 case PAM_TEXT_INFO: 1220 case PAM_ERROR_MSG: 1221 reply[i].resp_retcode = PAM_SUCCESS; 1222 reply[i].resp = NULL; 1223 break; 1224 default: /* unknown message style */ 1225 free(reply); 1226 return PAM_CONV_ERR; 1227 } 1228 } 1229 1230 *resp = reply; 1231 return PAM_SUCCESS; 1232} 1233 1234/* 1235 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1236 * authenticated, or 1 if not authenticated. If some sort of PAM system 1237 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1238 * function returns -1. This can be used as an indication that we should 1239 * fall back to a different authentication mechanism. 1240 */ 1241static int 1242auth_pam(struct passwd **ppw, const char *pass) 1243{ 1244 pam_handle_t *pamh = NULL; 1245 const char *tmpl_user; 1246 const void *item; 1247 int rval; 1248 int e; 1249 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1250 struct pam_conv conv = { &auth_conv, &auth_cred }; 1251 1252 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1253 if (e != PAM_SUCCESS) { 1254 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e)); 1255 return -1; 1256 } 1257 1258 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1259 if (e != PAM_SUCCESS) { 1260 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1261 pam_strerror(pamh, e)); 1262 return -1; 1263 } 1264 1265 e = pam_authenticate(pamh, 0); 1266 switch (e) { 1267 case PAM_SUCCESS: 1268 /* 1269 * With PAM we support the concept of a "template" 1270 * user. The user enters a login name which is 1271 * authenticated by PAM, usually via a remote service 1272 * such as RADIUS or TACACS+. If authentication 1273 * succeeds, a different but related "template" name 1274 * is used for setting the credentials, shell, and 1275 * home directory. The name the user enters need only 1276 * exist on the remote authentication server, but the 1277 * template name must be present in the local password 1278 * database. 1279 * 1280 * This is supported by two various mechanisms in the 1281 * individual modules. However, from the application's 1282 * point of view, the template user is always passed 1283 * back as a changed value of the PAM_USER item. 1284 */ 1285 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1286 PAM_SUCCESS) { 1287 tmpl_user = (const char *) item; 1288 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1289 *ppw = getpwnam(tmpl_user); 1290 } else 1291 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1292 pam_strerror(pamh, e)); 1293 rval = 0; 1294 break; 1295 1296 case PAM_AUTH_ERR: 1297 case PAM_USER_UNKNOWN: 1298 case PAM_MAXTRIES: 1299 rval = 1; 1300 break; 1301 1302 default: 1303 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1304 rval = -1; 1305 break; 1306 } 1307 1308 if (rval == 0) { 1309 e = pam_acct_mgmt(pamh, 0); 1310 if (e == PAM_NEW_AUTHTOK_REQD) { 1311 e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); 1312 if (e != PAM_SUCCESS) { 1313 syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); 1314 rval = 1; 1315 } 1316 } else if (e != PAM_SUCCESS) { 1317 rval = 1; 1318 } 1319 } 1320 1321 if (rval != 0) { 1322 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1323 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1324 } 1325 pamh = NULL; 1326 } 1327 return rval; 1328} 1329 1330#endif /* USE_PAM */ 1331 1332void 1333pass(char *passwd) 1334{ 1335 int rval; 1336 FILE *fd; 1337#ifdef LOGIN_CAP 1338 login_cap_t *lc = NULL; 1339#endif 1340#ifdef USE_PAM 1341 int e; 1342#endif 1343 char *chrootdir; 1344 char *residue = NULL; 1345 char *xpasswd; 1346 1347 if (logged_in || askpasswd == 0) { 1348 reply(503, "Login with USER first."); 1349 return; 1350 } 1351 askpasswd = 0; 1352 if (!guest) { /* "ftp" is only account allowed no password */ 1353 if (pw == NULL) { 1354 rval = 1; /* failure below */ 1355 goto skip; 1356 } 1357#ifdef USE_PAM 1358 rval = auth_pam(&pw, passwd); 1359 if (rval >= 0) { 1360 opieunlock(); 1361 goto skip; 1362 } 1363#endif 1364 if (opieverify(&opiedata, passwd) == 0) 1365 xpasswd = pw->pw_passwd; 1366 else if (pwok) { 1367 xpasswd = crypt(passwd, pw->pw_passwd); 1368 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1369 xpasswd = ":"; 1370 } else { 1371 rval = 1; 1372 goto skip; 1373 } 1374 rval = strcmp(pw->pw_passwd, xpasswd); 1375 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1376 rval = 1; /* failure */ 1377skip: 1378 /* 1379 * If rval == 1, the user failed the authentication check 1380 * above. If rval == 0, either PAM or local authentication 1381 * succeeded. 1382 */ 1383 if (rval) { 1384 reply(530, "Login incorrect."); 1385 if (logging) { 1386 syslog(LOG_NOTICE, 1387 "FTP LOGIN FAILED FROM %s", 1388 remotehost); 1389 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1390 "FTP LOGIN FAILED FROM %s, %s", 1391 remotehost, curname); 1392 } 1393 pw = NULL; 1394 if (login_attempts++ >= 5) { 1395 syslog(LOG_NOTICE, 1396 "repeated login failures from %s", 1397 remotehost); 1398 exit(0); 1399 } 1400 return; 1401 } 1402 } 1403 login_attempts = 0; /* this time successful */ 1404 if (setegid(pw->pw_gid) < 0) { 1405 reply(550, "Can't set gid."); 1406 return; 1407 } 1408 /* May be overridden by login.conf */ 1409 (void) umask(defumask); 1410#ifdef LOGIN_CAP 1411 if ((lc = login_getpwclass(pw)) != NULL) { 1412 char remote_ip[MAXHOSTNAMELEN]; 1413 1414 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1415 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1416 NI_NUMERICHOST); 1417 remote_ip[sizeof(remote_ip) - 1] = 0; 1418 if (!auth_hostok(lc, remotehost, remote_ip)) { 1419 syslog(LOG_INFO|LOG_AUTH, 1420 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1421 pw->pw_name); 1422 reply(530, "Permission denied.\n"); 1423 pw = NULL; 1424 return; 1425 } 1426 if (!auth_timeok(lc, time(NULL))) { 1427 reply(530, "Login not available right now.\n"); 1428 pw = NULL; 1429 return; 1430 } 1431 } 1432 setusercontext(lc, pw, 0, 1433 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1434 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1435#else 1436 setlogin(pw->pw_name); 1437 (void) initgroups(pw->pw_name, pw->pw_gid); 1438#endif 1439 1440#ifdef USE_PAM 1441 if (pamh) { 1442 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1443 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1444 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1445 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1446 } 1447 } 1448#endif 1449 1450 /* open wtmp before chroot */ 1451 if (dowtmp) 1452 ftpd_logwtmp(ttyline, pw->pw_name, 1453 (struct sockaddr *)&his_addr); 1454 logged_in = 1; 1455 1456 if (guest && stats && statfd < 0) 1457#ifdef VIRTUAL_HOSTING 1458 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1459#else 1460 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1461#endif 1462 if (statfd < 0) 1463 stats = 0; 1464 1465 dochroot = 1466 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1467#ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1468 || login_getcapbool(lc, "ftp-chroot", 0) 1469#endif 1470 ; 1471 chrootdir = NULL; 1472 /* 1473 * For a chrooted local user, 1474 * a) see whether ftpchroot(5) specifies a chroot directory, 1475 * b) extract the directory pathname from the line, 1476 * c) expand it to the absolute pathname if necessary. 1477 */ 1478 if (dochroot && residue && 1479 (chrootdir = strtok(residue, " \t")) != NULL) { 1480 if (chrootdir[0] != '/') 1481 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1482 else 1483 chrootdir = strdup(chrootdir); /* so it can be freed */ 1484 if (chrootdir == NULL) 1485 fatalerror("Ran out of memory."); 1486 } 1487 if (guest || dochroot) { 1488 /* 1489 * If no chroot directory set yet, use the login directory. 1490 * Copy it so it can be modified while pw->pw_dir stays intact. 1491 */ 1492 if (chrootdir == NULL && 1493 (chrootdir = strdup(pw->pw_dir)) == NULL) 1494 fatalerror("Ran out of memory."); 1495 /* 1496 * Check for the "/chroot/./home" syntax, 1497 * separate the chroot and home directory pathnames. 1498 */ 1499 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1500 *(homedir++) = '\0'; /* wipe '/' */ 1501 homedir++; /* skip '.' */ 1502 /* so chrootdir can be freed later */ 1503 if ((homedir = strdup(homedir)) == NULL) 1504 fatalerror("Ran out of memory."); 1505 } else { 1506 /* 1507 * We MUST do a chdir() after the chroot. Otherwise 1508 * the old current directory will be accessible as "." 1509 * outside the new root! 1510 */ 1511 homedir = "/"; 1512 } 1513 /* 1514 * Finally, do chroot() 1515 */ 1516 if (chroot(chrootdir) < 0) { 1517 reply(550, "Can't change root."); 1518 goto bad; 1519 } 1520 } else /* real user w/o chroot */ 1521 homedir = pw->pw_dir; 1522 /* 1523 * Set euid *before* doing chdir() so 1524 * a) the user won't be carried to a directory that he couldn't reach 1525 * on his own due to no permission to upper path components, 1526 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1527 * (uid 0 has no root power over NFS if not mapped explicitly.) 1528 */ 1529 if (seteuid(pw->pw_uid) < 0) { 1530 reply(550, "Can't set uid."); 1531 goto bad; 1532 } 1533 if (chdir(homedir) < 0) { 1534 if (guest || dochroot) { 1535 reply(550, "Can't change to base directory."); 1536 goto bad; 1537 } else { 1538 if (chdir("/") < 0) { 1539 reply(550, "Root is inaccessible."); 1540 goto bad; 1541 } 1542 lreply(230, "No directory! Logging in with home=/"); 1543 } 1544 } 1545 1546 /* 1547 * Display a login message, if it exists. 1548 * N.B. reply(230,) must follow the message. 1549 */ 1550#ifdef VIRTUAL_HOSTING 1551 fd = fopen(thishost->loginmsg, "r"); 1552#else 1553 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1554#endif 1555 if (fd != NULL) { 1556 char *cp, line[LINE_MAX]; 1557 1558 while (fgets(line, sizeof(line), fd) != NULL) { 1559 if ((cp = strchr(line, '\n')) != NULL) 1560 *cp = '\0'; 1561 lreply(230, "%s", line); 1562 } 1563 (void) fflush(stdout); 1564 (void) fclose(fd); 1565 } 1566 if (guest) { 1567 if (ident != NULL) 1568 free(ident); 1569 ident = strdup(passwd); 1570 if (ident == NULL) 1571 fatalerror("Ran out of memory."); 1572 1573 reply(230, "Guest login ok, access restrictions apply."); 1574#ifdef SETPROCTITLE 1575#ifdef VIRTUAL_HOSTING 1576 if (thishost != firsthost) 1577 snprintf(proctitle, sizeof(proctitle), 1578 "%s: anonymous(%s)/%s", remotehost, hostname, 1579 passwd); 1580 else 1581#endif 1582 snprintf(proctitle, sizeof(proctitle), 1583 "%s: anonymous/%s", remotehost, passwd); 1584 setproctitle("%s", proctitle); 1585#endif /* SETPROCTITLE */ 1586 if (logging) 1587 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1588 remotehost, passwd); 1589 } else { 1590 if (dochroot) 1591 reply(230, "User %s logged in, " 1592 "access restrictions apply.", pw->pw_name); 1593 else 1594 reply(230, "User %s logged in.", pw->pw_name); 1595 1596#ifdef SETPROCTITLE 1597 snprintf(proctitle, sizeof(proctitle), 1598 "%s: user/%s", remotehost, pw->pw_name); 1599 setproctitle("%s", proctitle); 1600#endif /* SETPROCTITLE */ 1601 if (logging) 1602 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1603 remotehost, pw->pw_name); 1604 } 1605#ifdef LOGIN_CAP 1606 login_close(lc); 1607#endif 1608 if (chrootdir) 1609 free(chrootdir); 1610 if (residue) 1611 free(residue); 1612 return; 1613bad: 1614 /* Forget all about it... */ 1615#ifdef LOGIN_CAP 1616 login_close(lc); 1617#endif 1618 if (chrootdir) 1619 free(chrootdir); 1620 if (residue) 1621 free(residue); 1622 end_login(); 1623} 1624 1625void 1626retrieve(char *cmd, char *name) 1627{ 1628 FILE *fin, *dout; 1629 struct stat st; 1630 int (*closefunc)(FILE *); 1631 time_t start; 1632 1633 if (cmd == 0) { 1634 fin = fopen(name, "r"), closefunc = fclose; 1635 st.st_size = 0; 1636 } else { 1637 char line[BUFSIZ]; 1638 1639 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1640 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1641 st.st_size = -1; 1642 st.st_blksize = BUFSIZ; 1643 } 1644 if (fin == NULL) { 1645 if (errno != 0) { 1646 perror_reply(550, name); 1647 if (cmd == 0) { 1648 LOGCMD("get", name); 1649 } 1650 } 1651 return; 1652 } 1653 byte_count = -1; 1654 if (cmd == 0) { 1655 if (fstat(fileno(fin), &st) < 0) { 1656 perror_reply(550, name); 1657 goto done; 1658 } 1659 if (!S_ISREG(st.st_mode)) { 1660 /* 1661 * Never sending a raw directory is a workaround 1662 * for buggy clients that will attempt to RETR 1663 * a directory before listing it, e.g., Mozilla. 1664 * Preventing a guest from getting irregular files 1665 * is a simple security measure. 1666 */ 1667 if (S_ISDIR(st.st_mode) || guest) { 1668 reply(550, "%s: not a plain file.", name); 1669 goto done; 1670 } 1671 st.st_size = -1; 1672 /* st.st_blksize is set for all descriptor types */ 1673 } 1674 } 1675 if (restart_point) { 1676 if (type == TYPE_A) { 1677 off_t i, n; 1678 int c; 1679 1680 n = restart_point; 1681 i = 0; 1682 while (i++ < n) { 1683 if ((c=getc(fin)) == EOF) { 1684 perror_reply(550, name); 1685 goto done; 1686 } 1687 if (c == '\n') 1688 i++; 1689 } 1690 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1691 perror_reply(550, name); 1692 goto done; 1693 } 1694 } 1695 dout = dataconn(name, st.st_size, "w"); 1696 if (dout == NULL) 1697 goto done; 1698 time(&start); 1699 send_data(fin, dout, st.st_blksize, st.st_size, 1700 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1701 if (cmd == 0 && guest && stats) 1702 logxfer(name, st.st_size, start); 1703 (void) fclose(dout); 1704 data = -1; 1705 pdata = -1; 1706done: 1707 if (cmd == 0) 1708 LOGBYTES("get", name, byte_count); 1709 (*closefunc)(fin); 1710} 1711 1712void 1713store(char *name, char *mode, int unique) 1714{ 1715 int fd; 1716 FILE *fout, *din; 1717 int (*closefunc)(FILE *); 1718 1719 if (*mode == 'a') { /* APPE */ 1720 if (unique) { 1721 /* Programming error */ 1722 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1723 unique = 0; 1724 } 1725 if (guest && noguestmod) { 1726 reply(550, "Appending to existing file denied"); 1727 goto err; 1728 } 1729 restart_point = 0; /* not affected by preceding REST */ 1730 } 1731 if (unique) /* STOU overrides REST */ 1732 restart_point = 0; 1733 if (guest && noguestmod) { 1734 if (restart_point) { /* guest STOR w/REST */ 1735 reply(550, "Modifying existing file denied"); 1736 goto err; 1737 } else /* treat guest STOR as STOU */ 1738 unique = 1; 1739 } 1740 1741 if (restart_point) 1742 mode = "r+"; /* so ASCII manual seek can work */ 1743 if (unique) { 1744 if ((fd = guniquefd(name, &name)) < 0) 1745 goto err; 1746 fout = fdopen(fd, mode); 1747 } else 1748 fout = fopen(name, mode); 1749 closefunc = fclose; 1750 if (fout == NULL) { 1751 perror_reply(553, name); 1752 goto err; 1753 } 1754 byte_count = -1; 1755 if (restart_point) { 1756 if (type == TYPE_A) { 1757 off_t i, n; 1758 int c; 1759 1760 n = restart_point; 1761 i = 0; 1762 while (i++ < n) { 1763 if ((c=getc(fout)) == EOF) { 1764 perror_reply(550, name); 1765 goto done; 1766 } 1767 if (c == '\n') 1768 i++; 1769 } 1770 /* 1771 * We must do this seek to "current" position 1772 * because we are changing from reading to 1773 * writing. 1774 */ 1775 if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) { 1776 perror_reply(550, name); 1777 goto done; 1778 } 1779 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1780 perror_reply(550, name); 1781 goto done; 1782 } 1783 } 1784 din = dataconn(name, (off_t)-1, "r"); 1785 if (din == NULL) 1786 goto done; 1787 if (receive_data(din, fout) == 0) { 1788 if (unique) 1789 reply(226, "Transfer complete (unique file name:%s).", 1790 name); 1791 else 1792 reply(226, "Transfer complete."); 1793 } 1794 (void) fclose(din); 1795 data = -1; 1796 pdata = -1; 1797done: 1798 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1799 (*closefunc)(fout); 1800 return; 1801err: 1802 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1803 return; 1804} 1805 1806static FILE * 1807getdatasock(char *mode) 1808{ 1809 int on = 1, s, t, tries; 1810 1811 if (data >= 0) 1812 return (fdopen(data, mode)); 1813 1814 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1815 if (s < 0) 1816 goto bad; 1817 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1818 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1819 /* anchor socket to avoid multi-homing problems */ 1820 data_source = ctrl_addr; 1821 data_source.su_port = htons(dataport); 1822 (void) seteuid(0); 1823 for (tries = 1; ; tries++) { 1824 /* 1825 * We should loop here since it's possible that 1826 * another ftpd instance has passed this point and is 1827 * trying to open a data connection in active mode now. 1828 * Until the other connection is opened, we'll be getting 1829 * EADDRINUSE because no SOCK_STREAM sockets in the system 1830 * can share both local and remote addresses, localIP:20 1831 * and *:* in this case. 1832 */ 1833 if (bind(s, (struct sockaddr *)&data_source, 1834 data_source.su_len) >= 0) 1835 break; 1836 if (errno != EADDRINUSE || tries > 10) 1837 goto bad; 1838 sleep(tries); 1839 } 1840 (void) seteuid(pw->pw_uid); 1841#ifdef IP_TOS 1842 if (data_source.su_family == AF_INET) 1843 { 1844 on = IPTOS_THROUGHPUT; 1845 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1846 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1847 } 1848#endif 1849#ifdef TCP_NOPUSH 1850 /* 1851 * Turn off push flag to keep sender TCP from sending short packets 1852 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1853 * to set the send buffer size as well, but that may not be desirable 1854 * in heavy-load situations. 1855 */ 1856 on = 1; 1857 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1858 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1859#endif 1860#ifdef SO_SNDBUF 1861 on = 65536; 1862 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1863 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1864#endif 1865 1866 return (fdopen(s, mode)); 1867bad: 1868 /* Return the real value of errno (close may change it) */ 1869 t = errno; 1870 (void) seteuid(pw->pw_uid); 1871 (void) close(s); 1872 errno = t; 1873 return (NULL); 1874} 1875 1876static FILE * 1877dataconn(char *name, off_t size, char *mode) 1878{ 1879 char sizebuf[32]; 1880 FILE *file; 1881 int retry = 0, tos, conerrno; 1882 1883 file_size = size; 1884 byte_count = 0; 1885 if (size != (off_t) -1) 1886 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size); 1887 else 1888 *sizebuf = '\0'; 1889 if (pdata >= 0) { 1890 union sockunion from; 1891 int flags; 1892 int s, fromlen = ctrl_addr.su_len; 1893 struct timeval timeout; 1894 fd_set set; 1895 1896 FD_ZERO(&set); 1897 FD_SET(pdata, &set); 1898 1899 timeout.tv_usec = 0; 1900 timeout.tv_sec = 120; 1901 1902 /* 1903 * Granted a socket is in the blocking I/O mode, 1904 * accept() will block after a successful select() 1905 * if the selected connection dies in between. 1906 * Therefore set the non-blocking I/O flag here. 1907 */ 1908 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1909 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1910 goto pdata_err; 1911 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) <= 0 || 1912 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1913 goto pdata_err; 1914 (void) close(pdata); 1915 pdata = s; 1916 /* 1917 * Unset the inherited non-blocking I/O flag 1918 * on the child socket so stdio can work on it. 1919 */ 1920 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1921 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1922 goto pdata_err; 1923#ifdef IP_TOS 1924 if (from.su_family == AF_INET) 1925 { 1926 tos = IPTOS_THROUGHPUT; 1927 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1928 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1929 } 1930#endif 1931 reply(150, "Opening %s mode data connection for '%s'%s.", 1932 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1933 return (fdopen(pdata, mode)); 1934pdata_err: 1935 reply(425, "Can't open data connection."); 1936 (void) close(pdata); 1937 pdata = -1; 1938 return (NULL); 1939 } 1940 if (data >= 0) { 1941 reply(125, "Using existing data connection for '%s'%s.", 1942 name, sizebuf); 1943 usedefault = 1; 1944 return (fdopen(data, mode)); 1945 } 1946 if (usedefault) 1947 data_dest = his_addr; 1948 usedefault = 1; 1949 do { 1950 file = getdatasock(mode); 1951 if (file == NULL) { 1952 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1953 getnameinfo((struct sockaddr *)&data_source, 1954 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1955 portbuf, sizeof(portbuf), 1956 NI_NUMERICHOST|NI_NUMERICSERV); 1957 reply(425, "Can't create data socket (%s,%s): %s.", 1958 hostbuf, portbuf, strerror(errno)); 1959 return (NULL); 1960 } 1961 data = fileno(file); 1962 conerrno = 0; 1963 if (connect(data, (struct sockaddr *)&data_dest, 1964 data_dest.su_len) == 0) 1965 break; 1966 conerrno = errno; 1967 (void) fclose(file); 1968 data = -1; 1969 if (conerrno == EADDRINUSE) { 1970 sleep((unsigned) swaitint); 1971 retry += swaitint; 1972 } else { 1973 break; 1974 } 1975 } while (retry <= swaitmax); 1976 if (conerrno != 0) { 1977 perror_reply(425, "Can't build data connection"); 1978 return (NULL); 1979 } 1980 reply(150, "Opening %s mode data connection for '%s'%s.", 1981 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1982 return (file); 1983} 1984 1985/* 1986 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1987 * encapsulation of the data subject to Mode, Structure, and Type. 1988 * 1989 * NB: Form isn't handled. 1990 */ 1991static int 1992send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1993{ 1994 int c, cp, filefd, netfd; 1995 char *buf; 1996 off_t cnt; 1997 1998 transflag++; 1999 switch (type) { 2000 2001 case TYPE_A: 2002 cp = '\0'; 2003 while ((c = getc(instr)) != EOF) { 2004 if (recvurg) 2005 goto got_oob; 2006 byte_count++; 2007 if (c == '\n' && cp != '\r') { 2008 if (ferror(outstr)) 2009 goto data_err; 2010 (void) putc('\r', outstr); 2011 } 2012 (void) putc(c, outstr); 2013 cp = c; 2014 } 2015 if (recvurg) 2016 goto got_oob; 2017 fflush(outstr); 2018 transflag = 0; 2019 if (ferror(instr)) 2020 goto file_err; 2021 if (ferror(outstr)) 2022 goto data_err; 2023 reply(226, "Transfer complete."); 2024 return (0); 2025 2026 case TYPE_I: 2027 case TYPE_L: 2028 /* 2029 * isreg is only set if we are not doing restart and we 2030 * are sending a regular file 2031 */ 2032 netfd = fileno(outstr); 2033 filefd = fileno(instr); 2034 2035 if (isreg) { 2036 2037 off_t offset; 2038 int err; 2039 2040 err = cnt = offset = 0; 2041 2042 while (err != -1 && filesize > 0) { 2043 err = sendfile(filefd, netfd, offset, 0, 2044 (struct sf_hdtr *) NULL, &cnt, 0); 2045 /* 2046 * Calculate byte_count before OOB processing. 2047 * It can be used in myoob() later. 2048 */ 2049 byte_count += cnt; 2050 if (recvurg) 2051 goto got_oob; 2052 offset += cnt; 2053 filesize -= cnt; 2054 2055 if (err == -1) { 2056 if (!cnt) 2057 goto oldway; 2058 2059 goto data_err; 2060 } 2061 } 2062 2063 transflag = 0; 2064 reply(226, "Transfer complete."); 2065 return (0); 2066 } 2067 2068oldway: 2069 if ((buf = malloc((u_int)blksize)) == NULL) { 2070 transflag = 0; 2071 perror_reply(451, "Local resource failure: malloc"); 2072 return (-1); 2073 } 2074 2075 while ((cnt = read(filefd, buf, (u_int)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 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; 2212 char line[LINE_MAX]; 2213 2214 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2215 fin = ftpd_popen(line, "r"); 2216 lreply(211, "status of %s:", filename); 2217 atstart = 1; 2218 while ((c = getc(fin)) != EOF) { 2219 if (c == '\n') { 2220 if (ferror(stdout)){ 2221 perror_reply(421, "control connection"); 2222 (void) ftpd_pclose(fin); 2223 dologout(1); 2224 /* NOTREACHED */ 2225 } 2226 if (ferror(fin)) { 2227 perror_reply(551, filename); 2228 (void) ftpd_pclose(fin); 2229 return; 2230 } 2231 (void) putc('\r', stdout); 2232 } 2233 /* 2234 * RFC 959 says neutral text should be prepended before 2235 * a leading 3-digit number followed by whitespace, but 2236 * many ftp clients can be confused by any leading digits, 2237 * as a matter of fact. 2238 */ 2239 if (atstart && isdigit(c)) 2240 (void) putc(' ', stdout); 2241 (void) putc(c, stdout); 2242 atstart = (c == '\n'); 2243 } 2244 (void) ftpd_pclose(fin); 2245 reply(211, "End of Status"); 2246} 2247 2248void 2249statcmd(void) 2250{ 2251 union sockunion *su; 2252 u_char *a, *p; 2253 char hname[NI_MAXHOST]; 2254 int ispassive; 2255 2256 if (hostinfo) { 2257 lreply(211, "%s FTP server status:", hostname); 2258 printf(" %s\r\n", version); 2259 } else 2260 lreply(211, "FTP server status:"); 2261 printf(" Connected to %s", remotehost); 2262 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2263 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2264 if (strcmp(hname, remotehost) != 0) 2265 printf(" (%s)", hname); 2266 } 2267 printf("\r\n"); 2268 if (logged_in) { 2269 if (guest) 2270 printf(" Logged in anonymously\r\n"); 2271 else 2272 printf(" Logged in as %s\r\n", pw->pw_name); 2273 } else if (askpasswd) 2274 printf(" Waiting for password\r\n"); 2275 else 2276 printf(" Waiting for user name\r\n"); 2277 printf(" TYPE: %s", typenames[type]); 2278 if (type == TYPE_A || type == TYPE_E) 2279 printf(", FORM: %s", formnames[form]); 2280 if (type == TYPE_L) 2281#if CHAR_BIT == 8 2282 printf(" %d", CHAR_BIT); 2283#else 2284 printf(" %d", bytesize); /* need definition! */ 2285#endif 2286 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2287 strunames[stru], modenames[mode]); 2288 if (data != -1) 2289 printf(" Data connection open\r\n"); 2290 else if (pdata != -1) { 2291 ispassive = 1; 2292 su = &pasv_addr; 2293 goto printaddr; 2294 } else if (usedefault == 0) { 2295 ispassive = 0; 2296 su = &data_dest; 2297printaddr: 2298#define UC(b) (((int) b) & 0xff) 2299 if (epsvall) { 2300 printf(" EPSV only mode (EPSV ALL)\r\n"); 2301 goto epsvonly; 2302 } 2303 2304 /* PORT/PASV */ 2305 if (su->su_family == AF_INET) { 2306 a = (u_char *) &su->su_sin.sin_addr; 2307 p = (u_char *) &su->su_sin.sin_port; 2308 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2309 ispassive ? "PASV" : "PORT", 2310 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2311 UC(p[0]), UC(p[1])); 2312 } 2313 2314 /* LPRT/LPSV */ 2315 { 2316 int alen, af, i; 2317 2318 switch (su->su_family) { 2319 case AF_INET: 2320 a = (u_char *) &su->su_sin.sin_addr; 2321 p = (u_char *) &su->su_sin.sin_port; 2322 alen = sizeof(su->su_sin.sin_addr); 2323 af = 4; 2324 break; 2325 case AF_INET6: 2326 a = (u_char *) &su->su_sin6.sin6_addr; 2327 p = (u_char *) &su->su_sin6.sin6_port; 2328 alen = sizeof(su->su_sin6.sin6_addr); 2329 af = 6; 2330 break; 2331 default: 2332 af = 0; 2333 break; 2334 } 2335 if (af) { 2336 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2337 af, alen); 2338 for (i = 0; i < alen; i++) 2339 printf("%d,", UC(a[i])); 2340 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2341 } 2342 } 2343 2344epsvonly:; 2345 /* EPRT/EPSV */ 2346 { 2347 int af; 2348 2349 switch (su->su_family) { 2350 case AF_INET: 2351 af = 1; 2352 break; 2353 case AF_INET6: 2354 af = 2; 2355 break; 2356 default: 2357 af = 0; 2358 break; 2359 } 2360 if (af) { 2361 union sockunion tmp; 2362 2363 tmp = *su; 2364 if (tmp.su_family == AF_INET6) 2365 tmp.su_sin6.sin6_scope_id = 0; 2366 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2367 hname, sizeof(hname) - 1, NULL, 0, 2368 NI_NUMERICHOST)) { 2369 printf(" %s |%d|%s|%d|\r\n", 2370 ispassive ? "EPSV" : "EPRT", 2371 af, hname, htons(tmp.su_port)); 2372 } 2373 } 2374 } 2375#undef UC 2376 } else 2377 printf(" No data connection\r\n"); 2378 reply(211, "End of status"); 2379} 2380 2381void 2382fatalerror(char *s) 2383{ 2384 2385 reply(451, "Error in server: %s\n", s); 2386 reply(221, "Closing connection due to server error."); 2387 dologout(0); 2388 /* NOTREACHED */ 2389} 2390 2391void 2392reply(int n, const char *fmt, ...) 2393{ 2394 va_list ap; 2395 2396 (void)printf("%d ", n); 2397 va_start(ap, fmt); 2398 (void)vprintf(fmt, ap); 2399 va_end(ap); 2400 (void)printf("\r\n"); 2401 (void)fflush(stdout); 2402 if (ftpdebug) { 2403 syslog(LOG_DEBUG, "<--- %d ", n); 2404 va_start(ap, fmt); 2405 vsyslog(LOG_DEBUG, fmt, ap); 2406 va_end(ap); 2407 } 2408} 2409 2410void 2411lreply(int n, const char *fmt, ...) 2412{ 2413 va_list ap; 2414 2415 (void)printf("%d- ", n); 2416 va_start(ap, fmt); 2417 (void)vprintf(fmt, ap); 2418 va_end(ap); 2419 (void)printf("\r\n"); 2420 (void)fflush(stdout); 2421 if (ftpdebug) { 2422 syslog(LOG_DEBUG, "<--- %d- ", n); 2423 va_start(ap, fmt); 2424 vsyslog(LOG_DEBUG, fmt, ap); 2425 va_end(ap); 2426 } 2427} 2428 2429static void 2430ack(char *s) 2431{ 2432 2433 reply(250, "%s command successful.", s); 2434} 2435 2436void 2437nack(char *s) 2438{ 2439 2440 reply(502, "%s command not implemented.", s); 2441} 2442 2443/* ARGSUSED */ 2444void 2445yyerror(char *s) 2446{ 2447 char *cp; 2448 2449 if ((cp = strchr(cbuf,'\n'))) 2450 *cp = '\0'; 2451 reply(500, "'%s': command not understood.", cbuf); 2452} 2453 2454void 2455delete(char *name) 2456{ 2457 struct stat st; 2458 2459 LOGCMD("delete", name); 2460 if (lstat(name, &st) < 0) { 2461 perror_reply(550, name); 2462 return; 2463 } 2464 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2465 if (rmdir(name) < 0) { 2466 perror_reply(550, name); 2467 return; 2468 } 2469 goto done; 2470 } 2471 if (guest && noguestmod) { 2472 reply(550, "Operation not permitted"); 2473 return; 2474 } 2475 if (unlink(name) < 0) { 2476 perror_reply(550, name); 2477 return; 2478 } 2479done: 2480 ack("DELE"); 2481} 2482 2483void 2484cwd(char *path) 2485{ 2486 2487 if (chdir(path) < 0) 2488 perror_reply(550, path); 2489 else 2490 ack("CWD"); 2491} 2492 2493void 2494makedir(char *name) 2495{ 2496 char *s; 2497 2498 LOGCMD("mkdir", name); 2499 if (guest && noguestmkd) 2500 reply(550, "%s: permission denied", name); 2501 else if (mkdir(name, 0777) < 0) 2502 perror_reply(550, name); 2503 else { 2504 if ((s = doublequote(name)) == NULL) 2505 fatalerror("Ran out of memory."); 2506 reply(257, "\"%s\" directory created.", s); 2507 free(s); 2508 } 2509} 2510 2511void 2512removedir(char *name) 2513{ 2514 2515 LOGCMD("rmdir", name); 2516 if (rmdir(name) < 0) 2517 perror_reply(550, name); 2518 else 2519 ack("RMD"); 2520} 2521 2522void 2523pwd(void) 2524{ 2525 char *s, path[MAXPATHLEN + 1]; 2526 2527 if (getwd(path) == (char *)NULL) 2528 reply(550, "%s.", path); 2529 else { 2530 if ((s = doublequote(path)) == NULL) 2531 fatalerror("Ran out of memory."); 2532 reply(257, "\"%s\" is current directory.", s); 2533 free(s); 2534 } 2535} 2536 2537char * 2538renamefrom(char *name) 2539{ 2540 struct stat st; 2541 2542 if (guest && noguestmod) { 2543 reply(550, "Operation not permitted"); 2544 return (NULL); 2545 } 2546 if (lstat(name, &st) < 0) { 2547 perror_reply(550, name); 2548 return (NULL); 2549 } 2550 reply(350, "File exists, ready for destination name"); 2551 return (name); 2552} 2553 2554void 2555renamecmd(char *from, char *to) 2556{ 2557 struct stat st; 2558 2559 LOGCMD2("rename", from, to); 2560 2561 if (guest && (stat(to, &st) == 0)) { 2562 reply(550, "%s: permission denied", to); 2563 return; 2564 } 2565 2566 if (rename(from, to) < 0) 2567 perror_reply(550, "rename"); 2568 else 2569 ack("RNTO"); 2570} 2571 2572static void 2573dolog(struct sockaddr *who) 2574{ 2575 int error; 2576 2577 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2578 2579#ifdef SETPROCTITLE 2580#ifdef VIRTUAL_HOSTING 2581 if (thishost != firsthost) 2582 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2583 remotehost, hostname); 2584 else 2585#endif 2586 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2587 remotehost); 2588 setproctitle("%s", proctitle); 2589#endif /* SETPROCTITLE */ 2590 2591 if (logging) { 2592#ifdef VIRTUAL_HOSTING 2593 if (thishost != firsthost) 2594 syslog(LOG_INFO, "connection from %s (to %s)", 2595 remotehost, hostname); 2596 else 2597#endif 2598 { 2599 char who_name[MAXHOSTNAMELEN]; 2600 2601 error = getnameinfo(who, who->sa_len, 2602 who_name, sizeof(who_name) - 1, 2603 NULL, 0, NI_NUMERICHOST); 2604 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2605 error == 0 ? who_name : ""); 2606 } 2607 } 2608} 2609 2610/* 2611 * Record logout in wtmp file 2612 * and exit with supplied status. 2613 */ 2614void 2615dologout(int status) 2616{ 2617 /* 2618 * Prevent reception of SIGURG from resulting in a resumption 2619 * back to the main program loop. 2620 */ 2621 transflag = 0; 2622 2623 if (logged_in && dowtmp) { 2624 (void) seteuid(0); 2625 ftpd_logwtmp(ttyline, "", NULL); 2626 } 2627 /* beware of flushing buffers after a SIGPIPE */ 2628 _exit(status); 2629} 2630 2631static void 2632sigurg(int signo) 2633{ 2634 2635 recvurg = 1; 2636} 2637 2638static void 2639myoob(void) 2640{ 2641 char *cp; 2642 2643 /* only process if transfer occurring */ 2644 if (!transflag) 2645 return; 2646 cp = tmpline; 2647 if (getline(cp, 7, stdin) == NULL) { 2648 reply(221, "You could at least say goodbye."); 2649 dologout(0); 2650 } 2651 upper(cp); 2652 if (strcmp(cp, "ABOR\r\n") == 0) { 2653 tmpline[0] = '\0'; 2654 reply(426, "Transfer aborted. Data connection closed."); 2655 reply(226, "Abort successful"); 2656 } 2657 if (strcmp(cp, "STAT\r\n") == 0) { 2658 tmpline[0] = '\0'; 2659 if (file_size != (off_t) -1) 2660 reply(213, "Status: %qd of %qd bytes transferred", 2661 byte_count, file_size); 2662 else 2663 reply(213, "Status: %qd bytes transferred", byte_count); 2664 } 2665} 2666 2667/* 2668 * Note: a response of 425 is not mentioned as a possible response to 2669 * the PASV command in RFC959. However, it has been blessed as 2670 * a legitimate response by Jon Postel in a telephone conversation 2671 * with Rick Adams on 25 Jan 89. 2672 */ 2673void 2674passive(void) 2675{ 2676 int len, on; 2677 char *p, *a; 2678 2679 if (pdata >= 0) /* close old port if one set */ 2680 close(pdata); 2681 2682 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2683 if (pdata < 0) { 2684 perror_reply(425, "Can't open passive connection"); 2685 return; 2686 } 2687 on = 1; 2688 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2689 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2690 2691 (void) seteuid(0); 2692 2693#ifdef IP_PORTRANGE 2694 if (ctrl_addr.su_family == AF_INET) { 2695 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2696 : IP_PORTRANGE_DEFAULT; 2697 2698 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2699 &on, sizeof(on)) < 0) 2700 goto pasv_error; 2701 } 2702#endif 2703#ifdef IPV6_PORTRANGE 2704 if (ctrl_addr.su_family == AF_INET6) { 2705 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2706 : IPV6_PORTRANGE_DEFAULT; 2707 2708 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2709 &on, sizeof(on)) < 0) 2710 goto pasv_error; 2711 } 2712#endif 2713 2714 pasv_addr = ctrl_addr; 2715 pasv_addr.su_port = 0; 2716 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2717 goto pasv_error; 2718 2719 (void) seteuid(pw->pw_uid); 2720 2721 len = sizeof(pasv_addr); 2722 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2723 goto pasv_error; 2724 if (listen(pdata, 1) < 0) 2725 goto pasv_error; 2726 if (pasv_addr.su_family == AF_INET) 2727 a = (char *) &pasv_addr.su_sin.sin_addr; 2728 else if (pasv_addr.su_family == AF_INET6 && 2729 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2730 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2731 else 2732 goto pasv_error; 2733 2734 p = (char *) &pasv_addr.su_port; 2735 2736#define UC(b) (((int) b) & 0xff) 2737 2738 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2739 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2740 return; 2741 2742pasv_error: 2743 (void) seteuid(pw->pw_uid); 2744 (void) close(pdata); 2745 pdata = -1; 2746 perror_reply(425, "Can't open passive connection"); 2747 return; 2748} 2749 2750/* 2751 * Long Passive defined in RFC 1639. 2752 * 228 Entering Long Passive Mode 2753 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2754 */ 2755 2756void 2757long_passive(char *cmd, int pf) 2758{ 2759 int len, on; 2760 char *p, *a; 2761 2762 if (pdata >= 0) /* close old port if one set */ 2763 close(pdata); 2764 2765 if (pf != PF_UNSPEC) { 2766 if (ctrl_addr.su_family != pf) { 2767 switch (ctrl_addr.su_family) { 2768 case AF_INET: 2769 pf = 1; 2770 break; 2771 case AF_INET6: 2772 pf = 2; 2773 break; 2774 default: 2775 pf = 0; 2776 break; 2777 } 2778 /* 2779 * XXX 2780 * only EPRT/EPSV ready clients will understand this 2781 */ 2782 if (strcmp(cmd, "EPSV") == 0 && pf) { 2783 reply(522, "Network protocol mismatch, " 2784 "use (%d)", pf); 2785 } else 2786 reply(501, "Network protocol mismatch"); /*XXX*/ 2787 2788 return; 2789 } 2790 } 2791 2792 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2793 if (pdata < 0) { 2794 perror_reply(425, "Can't open passive connection"); 2795 return; 2796 } 2797 on = 1; 2798 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2799 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2800 2801 (void) seteuid(0); 2802 2803 pasv_addr = ctrl_addr; 2804 pasv_addr.su_port = 0; 2805 len = pasv_addr.su_len; 2806 2807#ifdef IP_PORTRANGE 2808 if (ctrl_addr.su_family == AF_INET) { 2809 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2810 : IP_PORTRANGE_DEFAULT; 2811 2812 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2813 &on, sizeof(on)) < 0) 2814 goto pasv_error; 2815 } 2816#endif 2817#ifdef IPV6_PORTRANGE 2818 if (ctrl_addr.su_family == AF_INET6) { 2819 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2820 : IPV6_PORTRANGE_DEFAULT; 2821 2822 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2823 &on, sizeof(on)) < 0) 2824 goto pasv_error; 2825 } 2826#endif 2827 2828 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2829 goto pasv_error; 2830 2831 (void) seteuid(pw->pw_uid); 2832 2833 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2834 goto pasv_error; 2835 if (listen(pdata, 1) < 0) 2836 goto pasv_error; 2837 2838#define UC(b) (((int) b) & 0xff) 2839 2840 if (strcmp(cmd, "LPSV") == 0) { 2841 p = (char *)&pasv_addr.su_port; 2842 switch (pasv_addr.su_family) { 2843 case AF_INET: 2844 a = (char *) &pasv_addr.su_sin.sin_addr; 2845 v4_reply: 2846 reply(228, 2847"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2848 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2849 2, UC(p[0]), UC(p[1])); 2850 return; 2851 case AF_INET6: 2852 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2853 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2854 goto v4_reply; 2855 } 2856 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2857 reply(228, 2858"Entering Long Passive Mode " 2859"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2860 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2861 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2862 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2863 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2864 2, UC(p[0]), UC(p[1])); 2865 return; 2866 } 2867 } else if (strcmp(cmd, "EPSV") == 0) { 2868 switch (pasv_addr.su_family) { 2869 case AF_INET: 2870 case AF_INET6: 2871 reply(229, "Entering Extended Passive Mode (|||%d|)", 2872 ntohs(pasv_addr.su_port)); 2873 return; 2874 } 2875 } else { 2876 /* more proper error code? */ 2877 } 2878 2879pasv_error: 2880 (void) seteuid(pw->pw_uid); 2881 (void) close(pdata); 2882 pdata = -1; 2883 perror_reply(425, "Can't open passive connection"); 2884 return; 2885} 2886 2887/* 2888 * Generate unique name for file with basename "local" 2889 * and open the file in order to avoid possible races. 2890 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2891 * Return descriptor to the file, set "name" to its name. 2892 * 2893 * Generates failure reply on error. 2894 */ 2895static int 2896guniquefd(char *local, char **name) 2897{ 2898 static char new[MAXPATHLEN]; 2899 struct stat st; 2900 char *cp; 2901 int count; 2902 int fd; 2903 2904 cp = strrchr(local, '/'); 2905 if (cp) 2906 *cp = '\0'; 2907 if (stat(cp ? local : ".", &st) < 0) { 2908 perror_reply(553, cp ? local : "."); 2909 return (-1); 2910 } 2911 if (cp) { 2912 /* 2913 * Let not overwrite dirname with counter suffix. 2914 * -4 is for /nn\0 2915 * In this extreme case dot won't be put in front of suffix. 2916 */ 2917 if (strlen(local) > sizeof(new) - 4) { 2918 reply(553, "Pathname too long"); 2919 return (-1); 2920 } 2921 *cp = '/'; 2922 } 2923 /* -4 is for the .nn<null> we put on the end below */ 2924 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2925 cp = new + strlen(new); 2926 /* 2927 * Don't generate dotfile unless requested explicitly. 2928 * This covers the case when basename gets truncated off 2929 * by buffer size. 2930 */ 2931 if (cp > new && cp[-1] != '/') 2932 *cp++ = '.'; 2933 for (count = 0; count < 100; count++) { 2934 /* At count 0 try unmodified name */ 2935 if (count) 2936 (void)sprintf(cp, "%d", count); 2937 if ((fd = open(count ? new : local, 2938 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2939 *name = count ? new : local; 2940 return (fd); 2941 } 2942 if (errno != EEXIST) { 2943 perror_reply(553, count ? new : local); 2944 return (-1); 2945 } 2946 } 2947 reply(452, "Unique file name cannot be created."); 2948 return (-1); 2949} 2950 2951/* 2952 * Format and send reply containing system error number. 2953 */ 2954void 2955perror_reply(int code, char *string) 2956{ 2957 2958 reply(code, "%s: %s.", string, strerror(errno)); 2959} 2960 2961static char *onefile[] = { 2962 "", 2963 0 2964}; 2965 2966void 2967send_file_list(char *whichf) 2968{ 2969 struct stat st; 2970 DIR *dirp = NULL; 2971 struct dirent *dir; 2972 FILE *dout = NULL; 2973 char **dirlist, *dirname; 2974 int simple = 0; 2975 int freeglob = 0; 2976 glob_t gl; 2977 2978 if (strpbrk(whichf, "~{[*?") != NULL) { 2979 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2980 2981 memset(&gl, 0, sizeof(gl)); 2982 gl.gl_matchc = MAXGLOBARGS; 2983 flags |= GLOB_LIMIT; 2984 freeglob = 1; 2985 if (glob(whichf, flags, 0, &gl)) { 2986 reply(550, "not found"); 2987 goto out; 2988 } else if (gl.gl_pathc == 0) { 2989 errno = ENOENT; 2990 perror_reply(550, whichf); 2991 goto out; 2992 } 2993 dirlist = gl.gl_pathv; 2994 } else { 2995 onefile[0] = whichf; 2996 dirlist = onefile; 2997 simple = 1; 2998 } 2999 3000 while ((dirname = *dirlist++)) { 3001 if (stat(dirname, &st) < 0) { 3002 /* 3003 * If user typed "ls -l", etc, and the client 3004 * used NLST, do what the user meant. 3005 */ 3006 if (dirname[0] == '-' && *dirlist == NULL && 3007 transflag == 0) { 3008 retrieve(_PATH_LS " %s", dirname); 3009 goto out; 3010 } 3011 perror_reply(550, whichf); 3012 if (dout != NULL) { 3013 (void) fclose(dout); 3014 transflag = 0; 3015 data = -1; 3016 pdata = -1; 3017 } 3018 goto out; 3019 } 3020 3021 if (S_ISREG(st.st_mode)) { 3022 if (dout == NULL) { 3023 dout = dataconn("file list", (off_t)-1, "w"); 3024 if (dout == NULL) 3025 goto out; 3026 transflag++; 3027 } 3028 fprintf(dout, "%s%s\n", dirname, 3029 type == TYPE_A ? "\r" : ""); 3030 byte_count += strlen(dirname) + 1; 3031 continue; 3032 } else if (!S_ISDIR(st.st_mode)) 3033 continue; 3034 3035 if ((dirp = opendir(dirname)) == NULL) 3036 continue; 3037 3038 while ((dir = readdir(dirp)) != NULL) { 3039 char nbuf[MAXPATHLEN]; 3040 3041 if (recvurg) { 3042 myoob(); 3043 recvurg = 0; 3044 transflag = 0; 3045 goto out; 3046 } 3047 3048 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3049 continue; 3050 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3051 dir->d_namlen == 2) 3052 continue; 3053 3054 snprintf(nbuf, sizeof(nbuf), 3055 "%s/%s", dirname, dir->d_name); 3056 3057 /* 3058 * We have to do a stat to insure it's 3059 * not a directory or special file. 3060 */ 3061 if (simple || (stat(nbuf, &st) == 0 && 3062 S_ISREG(st.st_mode))) { 3063 if (dout == NULL) { 3064 dout = dataconn("file list", (off_t)-1, 3065 "w"); 3066 if (dout == NULL) 3067 goto out; 3068 transflag++; 3069 } 3070 if (nbuf[0] == '.' && nbuf[1] == '/') 3071 fprintf(dout, "%s%s\n", &nbuf[2], 3072 type == TYPE_A ? "\r" : ""); 3073 else 3074 fprintf(dout, "%s%s\n", nbuf, 3075 type == TYPE_A ? "\r" : ""); 3076 byte_count += strlen(nbuf) + 1; 3077 } 3078 } 3079 (void) closedir(dirp); 3080 } 3081 3082 if (dout == NULL) 3083 reply(550, "No files found."); 3084 else if (ferror(dout) != 0) 3085 perror_reply(550, "Data connection"); 3086 else 3087 reply(226, "Transfer complete."); 3088 3089 transflag = 0; 3090 if (dout != NULL) 3091 (void) fclose(dout); 3092 data = -1; 3093 pdata = -1; 3094out: 3095 if (freeglob) { 3096 freeglob = 0; 3097 globfree(&gl); 3098 } 3099} 3100 3101void 3102reapchild(int signo) 3103{ 3104 while (wait3(NULL, WNOHANG, NULL) > 0); 3105} 3106 3107#ifdef OLD_SETPROCTITLE 3108/* 3109 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3110 * Warning, since this is usually started from inetd.conf, it often doesn't 3111 * have much of an environment or arglist to overwrite. 3112 */ 3113void 3114setproctitle(const char *fmt, ...) 3115{ 3116 int i; 3117 va_list ap; 3118 char *p, *bp, ch; 3119 char buf[LINE_MAX]; 3120 3121 va_start(ap, fmt); 3122 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3123 3124 /* make ps print our process name */ 3125 p = Argv[0]; 3126 *p++ = '-'; 3127 3128 i = strlen(buf); 3129 if (i > LastArgv - p - 2) { 3130 i = LastArgv - p - 2; 3131 buf[i] = '\0'; 3132 } 3133 bp = buf; 3134 while (ch = *bp++) 3135 if (ch != '\n' && ch != '\r') 3136 *p++ = ch; 3137 while (p < LastArgv) 3138 *p++ = ' '; 3139} 3140#endif /* OLD_SETPROCTITLE */ 3141 3142static void 3143logxfer(char *name, off_t size, time_t start) 3144{ 3145 char buf[1024]; 3146 char path[MAXPATHLEN + 1]; 3147 time_t now; 3148 3149 if (statfd >= 0 && getwd(path) != NULL) { 3150 time(&now); 3151 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n", 3152 ctime(&now)+4, ident, remotehost, 3153 path, name, (long long)size, 3154 (long)(now - start + (now == start))); 3155 write(statfd, buf, strlen(buf)); 3156 } 3157} 3158 3159static char * 3160doublequote(char *s) 3161{ 3162 int n; 3163 char *p, *s2; 3164 3165 for (p = s, n = 0; *p; p++) 3166 if (*p == '"') 3167 n++; 3168 3169 if ((s2 = malloc(p - s + n + 1)) == NULL) 3170 return (NULL); 3171 3172 for (p = s2; *s; s++, p++) { 3173 if ((*p = *s) == '"') 3174 *(++p) = '"'; 3175 } 3176 *p = '\0'; 3177 3178 return (s2); 3179} 3180 3181/* setup server socket for specified address family */ 3182/* if af is PF_UNSPEC more than one socket may be returned */ 3183/* the returned list is dynamically allocated, so caller needs to free it */ 3184static int * 3185socksetup(int af, char *bindname, const char *bindport) 3186{ 3187 struct addrinfo hints, *res, *r; 3188 int error, maxs, *s, *socks; 3189 const int on = 1; 3190 3191 memset(&hints, 0, sizeof(hints)); 3192 hints.ai_flags = AI_PASSIVE; 3193 hints.ai_family = af; 3194 hints.ai_socktype = SOCK_STREAM; 3195 error = getaddrinfo(bindname, bindport, &hints, &res); 3196 if (error) { 3197 syslog(LOG_ERR, "%s", gai_strerror(error)); 3198 if (error == EAI_SYSTEM) 3199 syslog(LOG_ERR, "%s", strerror(errno)); 3200 return NULL; 3201 } 3202 3203 /* Count max number of sockets we may open */ 3204 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3205 ; 3206 socks = malloc((maxs + 1) * sizeof(int)); 3207 if (!socks) { 3208 freeaddrinfo(res); 3209 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3210 return NULL; 3211 } 3212 3213 *socks = 0; /* num of sockets counter at start of array */ 3214 s = socks + 1; 3215 for (r = res; r; r = r->ai_next) { 3216 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3217 if (*s < 0) { 3218 syslog(LOG_DEBUG, "control socket: %m"); 3219 continue; 3220 } 3221 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3222 &on, sizeof(on)) < 0) 3223 syslog(LOG_WARNING, 3224 "control setsockopt (SO_REUSEADDR): %m"); 3225 if (r->ai_family == AF_INET6) { 3226 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3227 &on, sizeof(on)) < 0) 3228 syslog(LOG_WARNING, 3229 "control setsockopt (IPV6_V6ONLY): %m"); 3230 } 3231 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3232 syslog(LOG_DEBUG, "control bind: %m"); 3233 close(*s); 3234 continue; 3235 } 3236 (*socks)++; 3237 s++; 3238 } 3239 3240 if (res) 3241 freeaddrinfo(res); 3242 3243 if (*socks == 0) { 3244 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3245 free(socks); 3246 return NULL; 3247 } 3248 return(socks); 3249} 3250