ftpd.c revision 109893
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 109893 2003-01-26 19:02:56Z 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 server_addr; 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 logged_in; 120struct passwd *pw; 121int ftpdebug; 122int timeout = 900; /* timeout after 15 minutes of inactivity */ 123int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 124int logging; 125int restricted_data_ports = 1; 126int paranoid = 1; /* be extra careful about security */ 127int anon_only = 0; /* Only anonymous ftp allowed */ 128int guest; 129int dochroot; 130int dowtmp = 1; 131int stats; 132int statfd = -1; 133int type; 134int form; 135int stru; /* avoid C keyword */ 136int mode; 137int usedefault = 1; /* for data transfers */ 138int pdata = -1; /* for passive mode */ 139int readonly=0; /* Server is in readonly mode. */ 140int noepsv=0; /* EPSV command is disabled. */ 141int noretr=0; /* RETR command is disabled. */ 142int noguestretr=0; /* RETR command is disabled for anon users. */ 143int noguestmkd=0; /* MKD command is disabled for anon users. */ 144int noguestmod=1; /* anon users may not modify existing files. */ 145 146static volatile sig_atomic_t recvurg; 147sig_atomic_t transflag; 148off_t file_size; 149off_t byte_count; 150#if !defined(CMASK) || CMASK == 0 151#undef CMASK 152#define CMASK 027 153#endif 154int defumask = CMASK; /* default umask value */ 155char tmpline[7]; 156char *hostname; 157int epsvall = 0; 158 159#ifdef VIRTUAL_HOSTING 160char *ftpuser; 161 162static struct ftphost { 163 struct ftphost *next; 164 struct addrinfo *hostinfo; 165 char *hostname; 166 char *anonuser; 167 char *statfile; 168 char *welcome; 169 char *loginmsg; 170} *thishost, *firsthost; 171 172#endif 173char remotehost[MAXHOSTNAMELEN]; 174char *ident = NULL; 175 176static char ttyline[20]; 177char *tty = ttyline; /* for klogin */ 178 179#ifdef USE_PAM 180static int auth_pam(struct passwd**, const char*); 181pam_handle_t *pamh = NULL; 182#endif 183 184static struct opie opiedata; 185static char opieprompt[OPIE_CHALLENGE_MAX+1]; 186static int pwok; 187 188char *pid_file = NULL; 189 190/* 191 * Limit number of pathnames that glob can return. 192 * A limit of 0 indicates the number of pathnames is unlimited. 193 */ 194#define MAXGLOBARGS 16384 195# 196 197/* 198 * Timeout intervals for retrying connections 199 * to hosts that don't accept PORT cmds. This 200 * is a kludge, but given the problems with TCP... 201 */ 202#define SWAITMAX 90 /* wait at most 90 seconds */ 203#define SWAITINT 5 /* interval between retries */ 204 205int swaitmax = SWAITMAX; 206int swaitint = SWAITINT; 207 208#ifdef SETPROCTITLE 209#ifdef OLD_SETPROCTITLE 210char **Argv = NULL; /* pointer to argument vector */ 211char *LastArgv = NULL; /* end of argv */ 212#endif /* OLD_SETPROCTITLE */ 213char proctitle[LINE_MAX]; /* initial part of title */ 214#endif /* SETPROCTITLE */ 215 216#define LOGCMD(cmd, file) \ 217 if (logging > 1) \ 218 syslog(LOG_INFO,"%s %s%s", cmd, \ 219 *(file) == '/' ? "" : curdir(), file); 220#define LOGCMD2(cmd, file1, file2) \ 221 if (logging > 1) \ 222 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 223 *(file1) == '/' ? "" : curdir(), file1, \ 224 *(file2) == '/' ? "" : curdir(), file2); 225#define LOGBYTES(cmd, file, cnt) \ 226 if (logging > 1) { \ 227 if (cnt == (off_t)-1) \ 228 syslog(LOG_INFO,"%s %s%s", cmd, \ 229 *(file) == '/' ? "" : curdir(), file); \ 230 else \ 231 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 232 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 233 } 234 235#ifdef VIRTUAL_HOSTING 236static void inithosts(void); 237static void selecthost(union sockunion *); 238#endif 239static void ack(char *); 240static void sigurg(int); 241static void myoob(void); 242static int checkuser(char *, char *, int, char **); 243static FILE *dataconn(char *, off_t, char *); 244static void dolog(struct sockaddr *); 245static char *curdir(void); 246static void end_login(void); 247static FILE *getdatasock(char *); 248static int guniquefd(char *, char **); 249static void lostconn(int); 250static void sigquit(int); 251static int receive_data(FILE *, FILE *); 252static int send_data(FILE *, FILE *, off_t, off_t, int); 253static struct passwd * 254 sgetpwnam(char *); 255static char *sgetsave(char *); 256static void reapchild(int); 257static void logxfer(char *, off_t, time_t); 258static char *doublequote(char *); 259 260static char * 261curdir(void) 262{ 263 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 264 265 if (getcwd(path, sizeof(path)-2) == NULL) 266 return (""); 267 if (path[1] != '\0') /* special case for root dir. */ 268 strcat(path, "/"); 269 /* For guest account, skip / since it's chrooted */ 270 return (guest ? path+1 : path); 271} 272 273int 274main(int argc, char *argv[], char **envp) 275{ 276 int addrlen, ch, on = 1, tos; 277 char *cp, line[LINE_MAX]; 278 FILE *fd; 279 int error; 280 char *bindname = NULL; 281 const char *bindport = "ftp"; 282 int family = AF_UNSPEC; 283 int enable_v4 = 0; 284 struct sigaction sa; 285 286 tzset(); /* in case no timezone database in ~ftp */ 287 sigemptyset(&sa.sa_mask); 288 sa.sa_flags = SA_RESTART; 289 290#ifdef OLD_SETPROCTITLE 291 /* 292 * Save start and extent of argv for setproctitle. 293 */ 294 Argv = argv; 295 while (*envp) 296 envp++; 297 LastArgv = envp[-1] + strlen(envp[-1]); 298#endif /* OLD_SETPROCTITLE */ 299 300 301 while ((ch = getopt(argc, argv, "46a:AdDElmMoOp:P:rRSt:T:u:UvW")) != -1) { 302 switch (ch) { 303 case '4': 304 enable_v4 = 1; 305 if (family == AF_UNSPEC) 306 family = AF_INET; 307 break; 308 309 case '6': 310 family = 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 'l': 334 logging++; /* > 1 == extra logging */ 335 break; 336 337 case 'm': 338 noguestmod = 0; 339 break; 340 341 case 'M': 342 noguestmkd = 1; 343 break; 344 345 case 'o': 346 noretr = 1; 347 break; 348 349 case 'O': 350 noguestretr = 1; 351 break; 352 353 case 'p': 354 pid_file = optarg; 355 break; 356 357 case 'P': 358 bindport = optarg; 359 break; 360 361 case 'r': 362 readonly = 1; 363 break; 364 365 case 'R': 366 paranoid = 0; 367 break; 368 369 case 'S': 370 stats++; 371 break; 372 373 case 't': 374 timeout = atoi(optarg); 375 if (maxtimeout < timeout) 376 maxtimeout = timeout; 377 break; 378 379 case 'T': 380 maxtimeout = atoi(optarg); 381 if (timeout > maxtimeout) 382 timeout = maxtimeout; 383 break; 384 385 case 'u': 386 { 387 long val = 0; 388 389 val = strtol(optarg, &optarg, 8); 390 if (*optarg != '\0' || val < 0) 391 warnx("bad value for -u"); 392 else 393 defumask = val; 394 break; 395 } 396 case 'U': 397 restricted_data_ports = 0; 398 break; 399 400 case 'v': 401 ftpdebug++; 402 break; 403 404 case 'W': 405 dowtmp = 0; 406 break; 407 408 default: 409 warnx("unknown flag -%c ignored", optopt); 410 break; 411 } 412 } 413 414#ifdef VIRTUAL_HOSTING 415 inithosts(); 416#endif 417 (void) freopen(_PATH_DEVNULL, "w", stderr); 418 419 /* 420 * LOG_NDELAY sets up the logging connection immediately, 421 * necessary for anonymous ftp's that chroot and can't do it later. 422 */ 423 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 424 425 if (daemon_mode) { 426 int ctl_sock, fd; 427 struct addrinfo hints, *res; 428 429 /* 430 * Detach from parent. 431 */ 432 if (daemon(1, 1) < 0) { 433 syslog(LOG_ERR, "failed to become a daemon"); 434 exit(1); 435 } 436 sa.sa_handler = reapchild; 437 (void)sigaction(SIGCHLD, &sa, NULL); 438 /* init bind_sa */ 439 memset(&hints, 0, sizeof(hints)); 440 441 hints.ai_family = family == AF_UNSPEC ? AF_INET : family; 442 hints.ai_socktype = SOCK_STREAM; 443 hints.ai_protocol = 0; 444 hints.ai_flags = AI_PASSIVE; 445 error = getaddrinfo(bindname, bindport, &hints, &res); 446 if (error) { 447 if (family == AF_UNSPEC) { 448 hints.ai_family = AF_UNSPEC; 449 error = getaddrinfo(bindname, bindport, &hints, 450 &res); 451 } 452 } 453 if (error) { 454 syslog(LOG_ERR, "%s", gai_strerror(error)); 455 if (error == EAI_SYSTEM) 456 syslog(LOG_ERR, "%s", strerror(errno)); 457 exit(1); 458 } 459 if (res->ai_addr == NULL) { 460 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 461 exit(1); 462 } else 463 family = res->ai_addr->sa_family; 464 /* 465 * Open a socket, bind it to the FTP port, and start 466 * listening. 467 */ 468 ctl_sock = socket(family, SOCK_STREAM, 0); 469 if (ctl_sock < 0) { 470 syslog(LOG_ERR, "control socket: %m"); 471 exit(1); 472 } 473 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 474 &on, sizeof(on)) < 0) 475 syslog(LOG_WARNING, 476 "control setsockopt (SO_REUSEADDR): %m"); 477 if (family == AF_INET6 && enable_v4 == 0) { 478 if (setsockopt(ctl_sock, IPPROTO_IPV6, IPV6_V6ONLY, 479 &on, sizeof (on)) < 0) 480 syslog(LOG_WARNING, 481 "control setsockopt (IPV6_V6ONLY): %m"); 482 } 483 memcpy(&server_addr, res->ai_addr, res->ai_addr->sa_len); 484 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 485 server_addr.su_len) < 0) { 486 syslog(LOG_ERR, "control bind: %m"); 487 exit(1); 488 } 489 if (listen(ctl_sock, 32) < 0) { 490 syslog(LOG_ERR, "control listen: %m"); 491 exit(1); 492 } 493 /* 494 * Atomically write process ID 495 */ 496 if (pid_file) 497 { 498 int fd; 499 char buf[20]; 500 501 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 502 | O_NONBLOCK | O_EXLOCK, 0644); 503 if (fd < 0) { 504 if (errno == EAGAIN) 505 errx(1, "%s: file locked", pid_file); 506 else 507 err(1, "%s", pid_file); 508 } 509 snprintf(buf, sizeof(buf), 510 "%lu\n", (unsigned long) getpid()); 511 if (write(fd, buf, strlen(buf)) < 0) 512 err(1, "%s: write", pid_file); 513 /* Leave the pid file open and locked */ 514 } 515 /* 516 * Loop forever accepting connection requests and forking off 517 * children to handle them. 518 */ 519 while (1) { 520 addrlen = server_addr.su_len; 521 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen); 522 if (fork() == 0) { 523 /* child */ 524 (void) dup2(fd, 0); 525 (void) dup2(fd, 1); 526 close(ctl_sock); 527 break; 528 } 529 close(fd); 530 } 531 } else { 532 addrlen = sizeof(his_addr); 533 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 534 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 535 exit(1); 536 } 537 } 538 539 sa.sa_handler = SIG_DFL; 540 (void)sigaction(SIGCHLD, &sa, NULL); 541 542 sa.sa_handler = sigurg; 543 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 544 (void)sigaction(SIGURG, &sa, NULL); 545 546 sigfillset(&sa.sa_mask); /* block all signals in handler */ 547 sa.sa_flags = SA_RESTART; 548 sa.sa_handler = sigquit; 549 (void)sigaction(SIGHUP, &sa, NULL); 550 (void)sigaction(SIGINT, &sa, NULL); 551 (void)sigaction(SIGQUIT, &sa, NULL); 552 (void)sigaction(SIGTERM, &sa, NULL); 553 554 sa.sa_handler = lostconn; 555 (void)sigaction(SIGPIPE, &sa, NULL); 556 557 addrlen = sizeof(ctrl_addr); 558 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 559 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 560 exit(1); 561 } 562 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 563#ifdef VIRTUAL_HOSTING 564 /* select our identity from virtual host table */ 565 selecthost(&ctrl_addr); 566#endif 567#ifdef IP_TOS 568 if (ctrl_addr.su_family == AF_INET) 569 { 570 tos = IPTOS_LOWDELAY; 571 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 572 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 573 } 574#endif 575 /* 576 * Disable Nagle on the control channel so that we don't have to wait 577 * for peer's ACK before issuing our next reply. 578 */ 579 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 580 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 581 582 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 583 584 /* set this here so klogin can use it... */ 585 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 586 587 /* Try to handle urgent data inline */ 588#ifdef SO_OOBINLINE 589 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 590 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 591#endif 592 593#ifdef F_SETOWN 594 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 595 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 596#endif 597 dolog((struct sockaddr *)&his_addr); 598 /* 599 * Set up default state 600 */ 601 data = -1; 602 type = TYPE_A; 603 form = FORM_N; 604 stru = STRU_F; 605 mode = MODE_S; 606 tmpline[0] = '\0'; 607 608 /* If logins are disabled, print out the message. */ 609 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 610 while (fgets(line, sizeof(line), fd) != NULL) { 611 if ((cp = strchr(line, '\n')) != NULL) 612 *cp = '\0'; 613 lreply(530, "%s", line); 614 } 615 (void) fflush(stdout); 616 (void) fclose(fd); 617 reply(530, "System not available."); 618 exit(0); 619 } 620#ifdef VIRTUAL_HOSTING 621 if ((fd = fopen(thishost->welcome, "r")) != NULL) { 622#else 623 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 624#endif 625 while (fgets(line, sizeof(line), fd) != NULL) { 626 if ((cp = strchr(line, '\n')) != NULL) 627 *cp = '\0'; 628 lreply(220, "%s", line); 629 } 630 (void) fflush(stdout); 631 (void) fclose(fd); 632 /* reply(220,) must follow */ 633 } 634#ifndef VIRTUAL_HOSTING 635 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 636 fatalerror("Ran out of memory."); 637 (void) gethostname(hostname, MAXHOSTNAMELEN - 1); 638 hostname[MAXHOSTNAMELEN - 1] = '\0'; 639#endif 640 reply(220, "%s FTP server (%s) ready.", hostname, version); 641 for (;;) 642 (void) yyparse(); 643 /* NOTREACHED */ 644} 645 646static void 647lostconn(int signo) 648{ 649 650 if (ftpdebug) 651 syslog(LOG_DEBUG, "lost connection"); 652 dologout(1); 653} 654 655static void 656sigquit(int signo) 657{ 658 659 syslog(LOG_ERR, "got signal %d", signo); 660 dologout(1); 661} 662 663#ifdef VIRTUAL_HOSTING 664/* 665 * read in virtual host tables (if they exist) 666 */ 667 668static void 669inithosts(void) 670{ 671 int insert; 672 size_t len; 673 FILE *fp; 674 char *cp, *mp, *line; 675 char *hostname; 676 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 677 struct ftphost *hrp, *lhrp; 678 struct addrinfo hints, *res, *ai; 679 680 /* 681 * Fill in the default host information 682 */ 683 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 684 fatalerror("Ran out of memory."); 685 if (gethostname(hostname, MAXHOSTNAMELEN) < 0) 686 hostname[0] = '\0'; 687 hostname[MAXHOSTNAMELEN - 1] = '\0'; 688 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 689 fatalerror("Ran out of memory."); 690 hrp->hostname = hostname; 691 hrp->hostinfo = NULL; 692 693 memset(&hints, 0, sizeof(hints)); 694 hints.ai_flags = AI_CANONNAME; 695 hints.ai_family = AF_UNSPEC; 696 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 697 hrp->hostinfo = res; 698 hrp->statfile = _PATH_FTPDSTATFILE; 699 hrp->welcome = _PATH_FTPWELCOME; 700 hrp->loginmsg = _PATH_FTPLOGINMESG; 701 hrp->anonuser = "ftp"; 702 hrp->next = NULL; 703 thishost = firsthost = lhrp = hrp; 704 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 705 int addrsize, gothost; 706 void *addr; 707 struct hostent *hp; 708 709 while ((line = fgetln(fp, &len)) != NULL) { 710 int i, hp_error; 711 712 /* skip comments */ 713 if (line[0] == '#') 714 continue; 715 if (line[len - 1] == '\n') { 716 line[len - 1] = '\0'; 717 mp = NULL; 718 } else { 719 if ((mp = malloc(len + 1)) == NULL) 720 fatalerror("Ran out of memory."); 721 memcpy(mp, line, len); 722 mp[len] = '\0'; 723 line = mp; 724 } 725 cp = strtok(line, " \t"); 726 /* skip empty lines */ 727 if (cp == NULL) 728 goto nextline; 729 vhost = cp; 730 731 /* set defaults */ 732 anonuser = "ftp"; 733 statfile = _PATH_FTPDSTATFILE; 734 welcome = _PATH_FTPWELCOME; 735 loginmsg = _PATH_FTPLOGINMESG; 736 737 /* 738 * Preparse the line so we can use its info 739 * for all the addresses associated with 740 * the virtual host name. 741 * Field 0, the virtual host name, is special: 742 * it's already parsed off and will be strdup'ed 743 * later, after we know its canonical form. 744 */ 745 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 746 if (*cp != '-' && (cp = strdup(cp))) 747 switch (i) { 748 case 1: /* anon user permissions */ 749 anonuser = cp; 750 break; 751 case 2: /* statistics file */ 752 statfile = cp; 753 break; 754 case 3: /* welcome message */ 755 welcome = cp; 756 break; 757 case 4: /* login message */ 758 loginmsg = cp; 759 break; 760 default: /* programming error */ 761 abort(); 762 /* NOTREACHED */ 763 } 764 765 hints.ai_flags = 0; 766 hints.ai_family = AF_UNSPEC; 767 hints.ai_flags = AI_PASSIVE; 768 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 769 goto nextline; 770 for (ai = res; ai != NULL && ai->ai_addr != NULL; 771 ai = ai->ai_next) { 772 773 gothost = 0; 774 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 775 struct addrinfo *hi; 776 777 for (hi = hrp->hostinfo; hi != NULL; 778 hi = hi->ai_next) 779 if (hi->ai_addrlen == ai->ai_addrlen && 780 memcmp(hi->ai_addr, 781 ai->ai_addr, 782 ai->ai_addr->sa_len) == 0) { 783 gothost++; 784 break; 785 } 786 if (gothost) 787 break; 788 } 789 if (hrp == NULL) { 790 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 791 goto nextline; 792 hrp->hostname = NULL; 793 insert = 1; 794 } else { 795 if (hrp->hostinfo && hrp->hostinfo != res) 796 freeaddrinfo(hrp->hostinfo); 797 insert = 0; /* host already in the chain */ 798 } 799 hrp->hostinfo = res; 800 801 /* 802 * determine hostname to use. 803 * force defined name if there is a valid alias 804 * otherwise fallback to primary hostname 805 */ 806 /* XXX: getaddrinfo() can't do alias check */ 807 switch(hrp->hostinfo->ai_family) { 808 case AF_INET: 809 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 810 addrsize = sizeof(struct in_addr); 811 break; 812 case AF_INET6: 813 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 814 addrsize = sizeof(struct in6_addr); 815 break; 816 default: 817 /* should not reach here */ 818 freeaddrinfo(hrp->hostinfo); 819 if (insert) 820 free(hrp); /*not in chain, can free*/ 821 else 822 hrp->hostinfo = NULL; /*mark as blank*/ 823 goto nextline; 824 /* NOTREACHED */ 825 } 826 if ((hp = getipnodebyaddr(addr, addrsize, 827 hrp->hostinfo->ai_family, 828 &hp_error)) != NULL) { 829 if (strcmp(vhost, hp->h_name) != 0) { 830 if (hp->h_aliases == NULL) 831 vhost = hp->h_name; 832 else { 833 i = 0; 834 while (hp->h_aliases[i] && 835 strcmp(vhost, hp->h_aliases[i]) != 0) 836 ++i; 837 if (hp->h_aliases[i] == NULL) 838 vhost = hp->h_name; 839 } 840 } 841 } 842 if (hrp->hostname && 843 strcmp(hrp->hostname, vhost) != 0) { 844 free(hrp->hostname); 845 hrp->hostname = NULL; 846 } 847 if (hrp->hostname == NULL && 848 (hrp->hostname = strdup(vhost)) == NULL) { 849 freeaddrinfo(hrp->hostinfo); 850 hrp->hostinfo = NULL; /* mark as blank */ 851 if (hp) 852 freehostent(hp); 853 goto nextline; 854 } 855 hrp->anonuser = anonuser; 856 hrp->statfile = statfile; 857 hrp->welcome = welcome; 858 hrp->loginmsg = loginmsg; 859 if (insert) { 860 hrp->next = NULL; 861 lhrp->next = hrp; 862 lhrp = hrp; 863 } 864 if (hp) 865 freehostent(hp); 866 } 867nextline: 868 if (mp) 869 free(mp); 870 } 871 (void) fclose(fp); 872 } 873} 874 875static void 876selecthost(union sockunion *su) 877{ 878 struct ftphost *hrp; 879 u_int16_t port; 880#ifdef INET6 881 struct in6_addr *mapped_in6 = NULL; 882#endif 883 struct addrinfo *hi; 884 885#ifdef INET6 886 /* 887 * XXX IPv4 mapped IPv6 addr consideraton, 888 * specified in rfc2373. 889 */ 890 if (su->su_family == AF_INET6 && 891 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 892 mapped_in6 = &su->su_sin6.sin6_addr; 893#endif 894 895 hrp = thishost = firsthost; /* default */ 896 port = su->su_port; 897 su->su_port = 0; 898 while (hrp != NULL) { 899 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 900 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 901 thishost = hrp; 902 break; 903 } 904#ifdef INET6 905 /* XXX IPv4 mapped IPv6 addr consideraton */ 906 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 907 (memcmp(&mapped_in6->s6_addr[12], 908 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 909 sizeof(struct in_addr)) == 0)) { 910 thishost = hrp; 911 break; 912 } 913#endif 914 } 915 hrp = hrp->next; 916 } 917 su->su_port = port; 918 /* setup static variables as appropriate */ 919 hostname = thishost->hostname; 920 ftpuser = thishost->anonuser; 921} 922#endif 923 924/* 925 * Helper function for sgetpwnam(). 926 */ 927static char * 928sgetsave(char *s) 929{ 930 char *new = malloc((unsigned) strlen(s) + 1); 931 932 if (new == NULL) { 933 perror_reply(421, "Local resource failure: malloc"); 934 dologout(1); 935 /* NOTREACHED */ 936 } 937 (void) strcpy(new, s); 938 return (new); 939} 940 941/* 942 * Save the result of a getpwnam. Used for USER command, since 943 * the data returned must not be clobbered by any other command 944 * (e.g., globbing). 945 */ 946static struct passwd * 947sgetpwnam(char *name) 948{ 949 static struct passwd save; 950 struct passwd *p; 951 952 if ((p = getpwnam(name)) == NULL) 953 return (p); 954 if (save.pw_name) { 955 free(save.pw_name); 956 free(save.pw_passwd); 957 free(save.pw_gecos); 958 free(save.pw_dir); 959 free(save.pw_shell); 960 } 961 save = *p; 962 save.pw_name = sgetsave(p->pw_name); 963 save.pw_passwd = sgetsave(p->pw_passwd); 964 save.pw_gecos = sgetsave(p->pw_gecos); 965 save.pw_dir = sgetsave(p->pw_dir); 966 save.pw_shell = sgetsave(p->pw_shell); 967 return (&save); 968} 969 970static int login_attempts; /* number of failed login attempts */ 971static int askpasswd; /* had user command, ask for passwd */ 972static char curname[MAXLOGNAME]; /* current USER name */ 973 974/* 975 * USER command. 976 * Sets global passwd pointer pw if named account exists and is acceptable; 977 * sets askpasswd if a PASS command is expected. If logged in previously, 978 * need to reset state. If name is "ftp" or "anonymous", the name is not in 979 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 980 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 981 * requesting login privileges. Disallow anyone who does not have a standard 982 * shell as returned by getusershell(). Disallow anyone mentioned in the file 983 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 984 */ 985void 986user(char *name) 987{ 988 char *cp, *shell; 989 990 if (logged_in) { 991 if (guest) { 992 reply(530, "Can't change user from guest login."); 993 return; 994 } else if (dochroot) { 995 reply(530, "Can't change user from chroot user."); 996 return; 997 } 998 end_login(); 999 } 1000 1001 guest = 0; 1002 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1003 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 1004 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 1005 reply(530, "User %s access denied.", name); 1006#ifdef VIRTUAL_HOSTING 1007 else if ((pw = sgetpwnam(thishost->anonuser)) != NULL) { 1008#else 1009 else if ((pw = sgetpwnam("ftp")) != NULL) { 1010#endif 1011 guest = 1; 1012 askpasswd = 1; 1013 reply(331, 1014 "Guest login ok, send your email address as password."); 1015 } else 1016 reply(530, "User %s unknown.", name); 1017 if (!askpasswd && logging) 1018 syslog(LOG_NOTICE, 1019 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1020 return; 1021 } 1022 if (anon_only != 0) { 1023 reply(530, "Sorry, only anonymous ftp allowed."); 1024 return; 1025 } 1026 1027 if ((pw = sgetpwnam(name))) { 1028 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1029 shell = _PATH_BSHELL; 1030 while ((cp = getusershell()) != NULL) 1031 if (strcmp(cp, shell) == 0) 1032 break; 1033 endusershell(); 1034 1035 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1036 reply(530, "User %s access denied.", name); 1037 if (logging) 1038 syslog(LOG_NOTICE, 1039 "FTP LOGIN REFUSED FROM %s, %s", 1040 remotehost, name); 1041 pw = (struct passwd *) NULL; 1042 return; 1043 } 1044 } 1045 if (logging) 1046 strncpy(curname, name, sizeof(curname)-1); 1047 1048 pwok = 0; 1049#ifdef USE_PAM 1050 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1051#endif 1052 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1053 pwok = (pw != NULL) && 1054 opieaccessfile(remotehost) && 1055 opiealways(pw->pw_dir); 1056 reply(331, "Response to %s %s for %s.", 1057 opieprompt, pwok ? "requested" : "required", name); 1058 } else { 1059 pwok = 1; 1060 reply(331, "Password required for %s.", name); 1061 } 1062 askpasswd = 1; 1063 /* 1064 * Delay before reading passwd after first failed 1065 * attempt to slow down passwd-guessing programs. 1066 */ 1067 if (login_attempts) 1068 sleep((unsigned) login_attempts); 1069} 1070 1071/* 1072 * Check if a user is in the file "fname", 1073 * return a pointer to a malloc'd string with the rest 1074 * of the matching line in "residue" if not NULL. 1075 */ 1076static int 1077checkuser(char *fname, char *name, int pwset, char **residue) 1078{ 1079 FILE *fd; 1080 int found = 0; 1081 size_t len; 1082 char *line, *mp, *p; 1083 1084 if ((fd = fopen(fname, "r")) != NULL) { 1085 while (!found && (line = fgetln(fd, &len)) != NULL) { 1086 /* skip comments */ 1087 if (line[0] == '#') 1088 continue; 1089 if (line[len - 1] == '\n') { 1090 line[len - 1] = '\0'; 1091 mp = NULL; 1092 } else { 1093 if ((mp = malloc(len + 1)) == NULL) 1094 fatalerror("Ran out of memory."); 1095 memcpy(mp, line, len); 1096 mp[len] = '\0'; 1097 line = mp; 1098 } 1099 /* avoid possible leading and trailing whitespace */ 1100 p = strtok(line, " \t"); 1101 /* skip empty lines */ 1102 if (p == NULL) 1103 goto nextline; 1104 /* 1105 * if first chr is '@', check group membership 1106 */ 1107 if (p[0] == '@') { 1108 int i = 0; 1109 struct group *grp; 1110 1111 if (p[1] == '\0') /* single @ matches anyone */ 1112 found = 1; 1113 else { 1114 if ((grp = getgrnam(p+1)) == NULL) 1115 goto nextline; 1116 /* 1117 * Check user's default group 1118 */ 1119 if (pwset && grp->gr_gid == pw->pw_gid) 1120 found = 1; 1121 /* 1122 * Check supplementary groups 1123 */ 1124 while (!found && grp->gr_mem[i]) 1125 found = strcmp(name, 1126 grp->gr_mem[i++]) 1127 == 0; 1128 } 1129 } 1130 /* 1131 * Otherwise, just check for username match 1132 */ 1133 else 1134 found = strcmp(p, name) == 0; 1135 /* 1136 * Save the rest of line to "residue" if matched 1137 */ 1138 if (found && residue) { 1139 if ((p = strtok(NULL, "")) != NULL) { 1140 if ((*residue = strdup(p)) == NULL) 1141 fatalerror("Ran out of memory."); 1142 } else 1143 *residue = NULL; 1144 } 1145nextline: 1146 if (mp) 1147 free(mp); 1148 } 1149 (void) fclose(fd); 1150 } 1151 return (found); 1152} 1153 1154/* 1155 * Terminate login as previous user, if any, resetting state; 1156 * used when USER command is given or login fails. 1157 */ 1158static void 1159end_login(void) 1160{ 1161#ifdef USE_PAM 1162 int e; 1163#endif 1164 1165 (void) seteuid((uid_t)0); 1166 if (logged_in && dowtmp) 1167 ftpd_logwtmp(ttyline, "", NULL); 1168 pw = NULL; 1169#ifdef LOGIN_CAP 1170 setusercontext(NULL, getpwuid(0), (uid_t)0, 1171 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1172 LOGIN_SETMAC); 1173#endif 1174#ifdef USE_PAM 1175 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1176 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1177 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1178 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1179 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1180 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1181 pamh = NULL; 1182#endif 1183 logged_in = 0; 1184 guest = 0; 1185 dochroot = 0; 1186} 1187 1188#ifdef USE_PAM 1189 1190/* 1191 * the following code is stolen from imap-uw PAM authentication module and 1192 * login.c 1193 */ 1194#define COPY_STRING(s) (s ? strdup(s) : NULL) 1195 1196struct cred_t { 1197 const char *uname; /* user name */ 1198 const char *pass; /* password */ 1199}; 1200typedef struct cred_t cred_t; 1201 1202static int 1203auth_conv(int num_msg, const struct pam_message **msg, 1204 struct pam_response **resp, void *appdata) 1205{ 1206 int i; 1207 cred_t *cred = (cred_t *) appdata; 1208 struct pam_response *reply; 1209 1210 reply = calloc(num_msg, sizeof *reply); 1211 if (reply == NULL) 1212 return PAM_BUF_ERR; 1213 1214 for (i = 0; i < num_msg; i++) { 1215 switch (msg[i]->msg_style) { 1216 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1217 reply[i].resp_retcode = PAM_SUCCESS; 1218 reply[i].resp = COPY_STRING(cred->uname); 1219 /* PAM frees resp. */ 1220 break; 1221 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1222 reply[i].resp_retcode = PAM_SUCCESS; 1223 reply[i].resp = COPY_STRING(cred->pass); 1224 /* PAM frees resp. */ 1225 break; 1226 case PAM_TEXT_INFO: 1227 case PAM_ERROR_MSG: 1228 reply[i].resp_retcode = PAM_SUCCESS; 1229 reply[i].resp = NULL; 1230 break; 1231 default: /* unknown message style */ 1232 free(reply); 1233 return PAM_CONV_ERR; 1234 } 1235 } 1236 1237 *resp = reply; 1238 return PAM_SUCCESS; 1239} 1240 1241/* 1242 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1243 * authenticated, or 1 if not authenticated. If some sort of PAM system 1244 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1245 * function returns -1. This can be used as an indication that we should 1246 * fall back to a different authentication mechanism. 1247 */ 1248static int 1249auth_pam(struct passwd **ppw, const char *pass) 1250{ 1251 pam_handle_t *pamh = NULL; 1252 const char *tmpl_user; 1253 const void *item; 1254 int rval; 1255 int e; 1256 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1257 struct pam_conv conv = { &auth_conv, &auth_cred }; 1258 1259 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1260 if (e != PAM_SUCCESS) { 1261 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e)); 1262 return -1; 1263 } 1264 1265 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1266 if (e != PAM_SUCCESS) { 1267 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1268 pam_strerror(pamh, e)); 1269 return -1; 1270 } 1271 1272 e = pam_authenticate(pamh, 0); 1273 switch (e) { 1274 case PAM_SUCCESS: 1275 /* 1276 * With PAM we support the concept of a "template" 1277 * user. The user enters a login name which is 1278 * authenticated by PAM, usually via a remote service 1279 * such as RADIUS or TACACS+. If authentication 1280 * succeeds, a different but related "template" name 1281 * is used for setting the credentials, shell, and 1282 * home directory. The name the user enters need only 1283 * exist on the remote authentication server, but the 1284 * template name must be present in the local password 1285 * database. 1286 * 1287 * This is supported by two various mechanisms in the 1288 * individual modules. However, from the application's 1289 * point of view, the template user is always passed 1290 * back as a changed value of the PAM_USER item. 1291 */ 1292 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1293 PAM_SUCCESS) { 1294 tmpl_user = (const char *) item; 1295 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1296 *ppw = getpwnam(tmpl_user); 1297 } else 1298 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1299 pam_strerror(pamh, e)); 1300 rval = 0; 1301 break; 1302 1303 case PAM_AUTH_ERR: 1304 case PAM_USER_UNKNOWN: 1305 case PAM_MAXTRIES: 1306 rval = 1; 1307 break; 1308 1309 default: 1310 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1311 rval = -1; 1312 break; 1313 } 1314 1315 if (rval == 0) { 1316 e = pam_acct_mgmt(pamh, 0); 1317 if (e == PAM_NEW_AUTHTOK_REQD) { 1318 e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); 1319 if (e != PAM_SUCCESS) { 1320 syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); 1321 rval = 1; 1322 } 1323 } else if (e != PAM_SUCCESS) { 1324 rval = 1; 1325 } 1326 } 1327 1328 if (rval != 0) { 1329 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1330 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1331 } 1332 pamh = NULL; 1333 } 1334 return rval; 1335} 1336 1337#endif /* USE_PAM */ 1338 1339void 1340pass(char *passwd) 1341{ 1342 int rval; 1343 FILE *fd; 1344#ifdef LOGIN_CAP 1345 login_cap_t *lc = NULL; 1346#endif 1347#ifdef USE_PAM 1348 int e; 1349#endif 1350 char *chrootdir; 1351 char *xpasswd; 1352 1353 if (logged_in || askpasswd == 0) { 1354 reply(503, "Login with USER first."); 1355 return; 1356 } 1357 askpasswd = 0; 1358 if (!guest) { /* "ftp" is only account allowed no password */ 1359 if (pw == NULL) { 1360 rval = 1; /* failure below */ 1361 goto skip; 1362 } 1363#ifdef USE_PAM 1364 rval = auth_pam(&pw, passwd); 1365 if (rval >= 0) { 1366 opieunlock(); 1367 goto skip; 1368 } 1369#endif 1370 if (opieverify(&opiedata, passwd) == 0) 1371 xpasswd = pw->pw_passwd; 1372 else if (pwok) { 1373 xpasswd = crypt(passwd, pw->pw_passwd); 1374 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1375 xpasswd = ":"; 1376 } else { 1377 rval = 1; 1378 goto skip; 1379 } 1380 rval = strcmp(pw->pw_passwd, xpasswd); 1381 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1382 rval = 1; /* failure */ 1383skip: 1384 /* 1385 * If rval == 1, the user failed the authentication check 1386 * above. If rval == 0, either PAM or local authentication 1387 * succeeded. 1388 */ 1389 if (rval) { 1390 reply(530, "Login incorrect."); 1391 if (logging) 1392 syslog(LOG_NOTICE, 1393 "FTP LOGIN FAILED FROM %s, %s", 1394 remotehost, curname); 1395 pw = NULL; 1396 if (login_attempts++ >= 5) { 1397 syslog(LOG_NOTICE, 1398 "repeated login failures from %s", 1399 remotehost); 1400 exit(0); 1401 } 1402 return; 1403 } 1404 } 1405 login_attempts = 0; /* this time successful */ 1406 if (setegid((gid_t)pw->pw_gid) < 0) { 1407 reply(550, "Can't set gid."); 1408 return; 1409 } 1410 /* May be overridden by login.conf */ 1411 (void) umask(defumask); 1412#ifdef LOGIN_CAP 1413 if ((lc = login_getpwclass(pw)) != NULL) { 1414 char remote_ip[MAXHOSTNAMELEN]; 1415 1416 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1417 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1418 NI_NUMERICHOST); 1419 remote_ip[sizeof(remote_ip) - 1] = 0; 1420 if (!auth_hostok(lc, remotehost, remote_ip)) { 1421 syslog(LOG_INFO|LOG_AUTH, 1422 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1423 pw->pw_name); 1424 reply(530, "Permission denied.\n"); 1425 pw = NULL; 1426 return; 1427 } 1428 if (!auth_timeok(lc, time(NULL))) { 1429 reply(530, "Login not available right now.\n"); 1430 pw = NULL; 1431 return; 1432 } 1433 } 1434 setusercontext(lc, pw, (uid_t)0, 1435 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1436 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1437#else 1438 setlogin(pw->pw_name); 1439 (void) initgroups(pw->pw_name, pw->pw_gid); 1440#endif 1441 1442#ifdef USE_PAM 1443 if (pamh) { 1444 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1445 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1446 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1447 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1448 } 1449 } 1450#endif 1451 1452 /* open wtmp before chroot */ 1453 if (dowtmp) 1454 ftpd_logwtmp(ttyline, pw->pw_name, 1455 (struct sockaddr *)&his_addr); 1456 logged_in = 1; 1457 1458 if (guest && stats && statfd < 0) 1459#ifdef VIRTUAL_HOSTING 1460 if ((statfd = open(thishost->statfile, O_WRONLY|O_APPEND)) < 0) 1461#else 1462 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1463#endif 1464 stats = 0; 1465 1466 dochroot = 1467 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &chrootdir) 1468#ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1469 || login_getcapbool(lc, "ftp-chroot", 0) 1470#endif 1471 ; 1472 if (guest) { 1473 /* 1474 * We MUST do a chdir() after the chroot. Otherwise 1475 * the old current directory will be accessible as "." 1476 * outside the new root! 1477 */ 1478 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 1479 reply(550, "Can't set guest privileges."); 1480 goto bad; 1481 } 1482 } else if (dochroot) { 1483 if (chrootdir) { /* chroot dir set in ftpchroot(5) */ 1484 if (chrootdir[0] != '/') { /* relative to homedir */ 1485 char *p; 1486 1487 asprintf(&p, "%s/%s", pw->pw_dir, chrootdir); 1488 if (p == NULL) 1489 fatalerror("Ran out of memory."); 1490 free(chrootdir); 1491 chrootdir = p; 1492 } 1493 } else 1494 if ((chrootdir = strdup(pw->pw_dir)) == NULL) 1495 fatalerror("Ran out of memory."); 1496 if (chroot(chrootdir) < 0 || chdir("/") < 0) { 1497 reply(550, "Can't change root."); 1498 free(chrootdir); 1499 goto bad; 1500 } 1501 free(chrootdir); 1502 } else if (chdir(pw->pw_dir) < 0) { 1503 if (chdir("/") < 0) { 1504 reply(530, "User %s: can't change directory to %s.", 1505 pw->pw_name, pw->pw_dir); 1506 goto bad; 1507 } else 1508 lreply(230, "No directory! Logging in with home=/"); 1509 } 1510 if (seteuid((uid_t)pw->pw_uid) < 0) { 1511 reply(550, "Can't set uid."); 1512 goto bad; 1513 } 1514 1515 /* 1516 * Display a login message, if it exists. 1517 * N.B. reply(230,) must follow the message. 1518 */ 1519#ifdef VIRTUAL_HOSTING 1520 if ((fd = fopen(thishost->loginmsg, "r")) != NULL) { 1521#else 1522 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 1523#endif 1524 char *cp, line[LINE_MAX]; 1525 1526 while (fgets(line, sizeof(line), fd) != NULL) { 1527 if ((cp = strchr(line, '\n')) != NULL) 1528 *cp = '\0'; 1529 lreply(230, "%s", line); 1530 } 1531 (void) fflush(stdout); 1532 (void) fclose(fd); 1533 } 1534 if (guest) { 1535 if (ident != NULL) 1536 free(ident); 1537 ident = strdup(passwd); 1538 if (ident == NULL) 1539 fatalerror("Ran out of memory."); 1540 1541 reply(230, "Guest login ok, access restrictions apply."); 1542#ifdef SETPROCTITLE 1543#ifdef VIRTUAL_HOSTING 1544 if (thishost != firsthost) 1545 snprintf(proctitle, sizeof(proctitle), 1546 "%s: anonymous(%s)/%s", remotehost, hostname, 1547 passwd); 1548 else 1549#endif 1550 snprintf(proctitle, sizeof(proctitle), 1551 "%s: anonymous/%s", remotehost, passwd); 1552 setproctitle("%s", proctitle); 1553#endif /* SETPROCTITLE */ 1554 if (logging) 1555 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1556 remotehost, passwd); 1557 } else { 1558 if (dochroot) 1559 reply(230, "User %s logged in, " 1560 "access restrictions apply.", pw->pw_name); 1561 else 1562 reply(230, "User %s logged in.", pw->pw_name); 1563 1564#ifdef SETPROCTITLE 1565 snprintf(proctitle, sizeof(proctitle), 1566 "%s: user/%s", remotehost, pw->pw_name); 1567 setproctitle("%s", proctitle); 1568#endif /* SETPROCTITLE */ 1569 if (logging) 1570 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1571 remotehost, pw->pw_name); 1572 } 1573#ifdef LOGIN_CAP 1574 login_close(lc); 1575#endif 1576 return; 1577bad: 1578 /* Forget all about it... */ 1579#ifdef LOGIN_CAP 1580 login_close(lc); 1581#endif 1582 end_login(); 1583} 1584 1585void 1586retrieve(char *cmd, char *name) 1587{ 1588 FILE *fin, *dout; 1589 struct stat st; 1590 int (*closefunc)(FILE *); 1591 time_t start; 1592 1593 if (cmd == 0) { 1594 fin = fopen(name, "r"), closefunc = fclose; 1595 st.st_size = 0; 1596 } else { 1597 char line[BUFSIZ]; 1598 1599 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1600 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1601 st.st_size = -1; 1602 st.st_blksize = BUFSIZ; 1603 } 1604 if (fin == NULL) { 1605 if (errno != 0) { 1606 perror_reply(550, name); 1607 if (cmd == 0) { 1608 LOGCMD("get", name); 1609 } 1610 } 1611 return; 1612 } 1613 byte_count = -1; 1614 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1615 reply(550, "%s: not a plain file.", name); 1616 goto done; 1617 } 1618 if (restart_point) { 1619 if (type == TYPE_A) { 1620 off_t i, n; 1621 int c; 1622 1623 n = restart_point; 1624 i = 0; 1625 while (i++ < n) { 1626 if ((c=getc(fin)) == EOF) { 1627 perror_reply(550, name); 1628 goto done; 1629 } 1630 if (c == '\n') 1631 i++; 1632 } 1633 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1634 perror_reply(550, name); 1635 goto done; 1636 } 1637 } 1638 dout = dataconn(name, st.st_size, "w"); 1639 if (dout == NULL) 1640 goto done; 1641 time(&start); 1642 send_data(fin, dout, st.st_blksize, st.st_size, 1643 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1644 if (cmd == 0 && guest && stats) 1645 logxfer(name, st.st_size, start); 1646 (void) fclose(dout); 1647 data = -1; 1648 pdata = -1; 1649done: 1650 if (cmd == 0) 1651 LOGBYTES("get", name, byte_count); 1652 (*closefunc)(fin); 1653} 1654 1655void 1656store(char *name, char *mode, int unique) 1657{ 1658 int fd; 1659 FILE *fout, *din; 1660 int (*closefunc)(FILE *); 1661 1662 if (*mode == 'a') { /* APPE */ 1663 if (unique) { 1664 /* Programming error */ 1665 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1666 unique = 0; 1667 } 1668 if (guest && noguestmod) { 1669 reply(550, "Appending to existing file denied"); 1670 goto err; 1671 } 1672 restart_point = 0; /* not affected by preceding REST */ 1673 } 1674 if (unique) /* STOU overrides REST */ 1675 restart_point = 0; 1676 if (guest && noguestmod) { 1677 if (restart_point) { /* guest STOR w/REST */ 1678 reply(550, "Modifying existing file denied"); 1679 goto err; 1680 } else /* treat guest STOR as STOU */ 1681 unique = 1; 1682 } 1683 1684 if (restart_point) 1685 mode = "r+"; /* so ASCII manual seek can work */ 1686 if (unique) { 1687 if ((fd = guniquefd(name, &name)) < 0) 1688 goto err; 1689 fout = fdopen(fd, mode); 1690 } else 1691 fout = fopen(name, mode); 1692 closefunc = fclose; 1693 if (fout == NULL) { 1694 perror_reply(553, name); 1695 goto err; 1696 } 1697 byte_count = -1; 1698 if (restart_point) { 1699 if (type == TYPE_A) { 1700 off_t i, n; 1701 int c; 1702 1703 n = restart_point; 1704 i = 0; 1705 while (i++ < n) { 1706 if ((c=getc(fout)) == EOF) { 1707 perror_reply(550, name); 1708 goto done; 1709 } 1710 if (c == '\n') 1711 i++; 1712 } 1713 /* 1714 * We must do this seek to "current" position 1715 * because we are changing from reading to 1716 * writing. 1717 */ 1718 if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) { 1719 perror_reply(550, name); 1720 goto done; 1721 } 1722 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1723 perror_reply(550, name); 1724 goto done; 1725 } 1726 } 1727 din = dataconn(name, (off_t)-1, "r"); 1728 if (din == NULL) 1729 goto done; 1730 if (receive_data(din, fout) == 0) { 1731 if (unique) 1732 reply(226, "Transfer complete (unique file name:%s).", 1733 name); 1734 else 1735 reply(226, "Transfer complete."); 1736 } 1737 (void) fclose(din); 1738 data = -1; 1739 pdata = -1; 1740done: 1741 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1742 (*closefunc)(fout); 1743 return; 1744err: 1745 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1746 return; 1747} 1748 1749static FILE * 1750getdatasock(char *mode) 1751{ 1752 int on = 1, s, t, tries; 1753 1754 if (data >= 0) 1755 return (fdopen(data, mode)); 1756 (void) seteuid((uid_t)0); 1757 1758 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1759 if (s < 0) 1760 goto bad; 1761 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1762 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1763 /* anchor socket to avoid multi-homing problems */ 1764 data_source = ctrl_addr; 1765 data_source.su_port = htons(dataport); 1766 for (tries = 1; ; tries++) { 1767 if (bind(s, (struct sockaddr *)&data_source, 1768 data_source.su_len) >= 0) 1769 break; 1770 if (errno != EADDRINUSE || tries > 10) 1771 goto bad; 1772 sleep(tries); 1773 } 1774 (void) seteuid((uid_t)pw->pw_uid); 1775#ifdef IP_TOS 1776 if (data_source.su_family == AF_INET) 1777 { 1778 on = IPTOS_THROUGHPUT; 1779 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1780 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1781 } 1782#endif 1783#ifdef TCP_NOPUSH 1784 /* 1785 * Turn off push flag to keep sender TCP from sending short packets 1786 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1787 * to set the send buffer size as well, but that may not be desirable 1788 * in heavy-load situations. 1789 */ 1790 on = 1; 1791 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1792 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1793#endif 1794#ifdef SO_SNDBUF 1795 on = 65536; 1796 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1797 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1798#endif 1799 1800 return (fdopen(s, mode)); 1801bad: 1802 /* Return the real value of errno (close may change it) */ 1803 t = errno; 1804 (void) seteuid((uid_t)pw->pw_uid); 1805 (void) close(s); 1806 errno = t; 1807 return (NULL); 1808} 1809 1810static FILE * 1811dataconn(char *name, off_t size, char *mode) 1812{ 1813 char sizebuf[32]; 1814 FILE *file; 1815 int retry = 0, tos, conerrno; 1816 1817 file_size = size; 1818 byte_count = 0; 1819 if (size != (off_t) -1) 1820 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size); 1821 else 1822 *sizebuf = '\0'; 1823 if (pdata >= 0) { 1824 union sockunion from; 1825 int flags; 1826 int s, fromlen = ctrl_addr.su_len; 1827 struct timeval timeout; 1828 fd_set set; 1829 1830 FD_ZERO(&set); 1831 FD_SET(pdata, &set); 1832 1833 timeout.tv_usec = 0; 1834 timeout.tv_sec = 120; 1835 1836 /* 1837 * Granted a socket is in the blocking I/O mode, 1838 * accept() will block after a successful select() 1839 * if the selected connection dies in between. 1840 * Therefore set the non-blocking I/O flag here. 1841 */ 1842 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1843 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1844 goto pdata_err; 1845 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) <= 0 || 1846 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1847 goto pdata_err; 1848 (void) close(pdata); 1849 pdata = s; 1850 /* 1851 * Unset the inherited non-blocking I/O flag 1852 * on the child socket so stdio can work on it. 1853 */ 1854 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1855 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1856 goto pdata_err; 1857#ifdef IP_TOS 1858 if (from.su_family == AF_INET) 1859 { 1860 tos = IPTOS_THROUGHPUT; 1861 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1862 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1863 } 1864#endif 1865 reply(150, "Opening %s mode data connection for '%s'%s.", 1866 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1867 return (fdopen(pdata, mode)); 1868pdata_err: 1869 reply(425, "Can't open data connection."); 1870 (void) close(pdata); 1871 pdata = -1; 1872 return (NULL); 1873 } 1874 if (data >= 0) { 1875 reply(125, "Using existing data connection for '%s'%s.", 1876 name, sizebuf); 1877 usedefault = 1; 1878 return (fdopen(data, mode)); 1879 } 1880 if (usedefault) 1881 data_dest = his_addr; 1882 usedefault = 1; 1883 do { 1884 file = getdatasock(mode); 1885 if (file == NULL) { 1886 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1887 getnameinfo((struct sockaddr *)&data_source, 1888 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1889 portbuf, sizeof(portbuf), 1890 NI_NUMERICHOST|NI_NUMERICSERV); 1891 reply(425, "Can't create data socket (%s,%s): %s.", 1892 hostbuf, portbuf, strerror(errno)); 1893 return (NULL); 1894 } 1895 data = fileno(file); 1896 conerrno = 0; 1897 if (connect(data, (struct sockaddr *)&data_dest, 1898 data_dest.su_len) == 0) 1899 break; 1900 conerrno = errno; 1901 (void) fclose(file); 1902 data = -1; 1903 if (conerrno == EADDRINUSE) { 1904 sleep((unsigned) swaitint); 1905 retry += swaitint; 1906 } else { 1907 break; 1908 } 1909 } while (retry <= swaitmax); 1910 if (conerrno != 0) { 1911 perror_reply(425, "Can't build data connection"); 1912 return (NULL); 1913 } 1914 reply(150, "Opening %s mode data connection for '%s'%s.", 1915 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1916 return (file); 1917} 1918 1919/* 1920 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1921 * encapsulation of the data subject to Mode, Structure, and Type. 1922 * 1923 * NB: Form isn't handled. 1924 */ 1925static int 1926send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1927{ 1928 int c, filefd, netfd; 1929 char *buf; 1930 off_t cnt; 1931 1932 transflag++; 1933 switch (type) { 1934 1935 case TYPE_A: 1936 while ((c = getc(instr)) != EOF) { 1937 if (recvurg) 1938 goto got_oob; 1939 byte_count++; 1940 if (c == '\n') { 1941 if (ferror(outstr)) 1942 goto data_err; 1943 (void) putc('\r', outstr); 1944 } 1945 (void) putc(c, outstr); 1946 } 1947 if (recvurg) 1948 goto got_oob; 1949 fflush(outstr); 1950 transflag = 0; 1951 if (ferror(instr)) 1952 goto file_err; 1953 if (ferror(outstr)) 1954 goto data_err; 1955 reply(226, "Transfer complete."); 1956 return (0); 1957 1958 case TYPE_I: 1959 case TYPE_L: 1960 /* 1961 * isreg is only set if we are not doing restart and we 1962 * are sending a regular file 1963 */ 1964 netfd = fileno(outstr); 1965 filefd = fileno(instr); 1966 1967 if (isreg) { 1968 1969 off_t offset; 1970 int err; 1971 1972 err = cnt = offset = 0; 1973 1974 while (err != -1 && filesize > 0) { 1975 err = sendfile(filefd, netfd, offset, 0, 1976 (struct sf_hdtr *) NULL, &cnt, 0); 1977 /* 1978 * Calculate byte_count before OOB processing. 1979 * It can be used in myoob() later. 1980 */ 1981 byte_count += cnt; 1982 if (recvurg) 1983 goto got_oob; 1984 offset += cnt; 1985 filesize -= cnt; 1986 1987 if (err == -1) { 1988 if (!cnt) 1989 goto oldway; 1990 1991 goto data_err; 1992 } 1993 } 1994 1995 transflag = 0; 1996 reply(226, "Transfer complete."); 1997 return (0); 1998 } 1999 2000oldway: 2001 if ((buf = malloc((u_int)blksize)) == NULL) { 2002 transflag = 0; 2003 perror_reply(451, "Local resource failure: malloc"); 2004 return (-1); 2005 } 2006 2007 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 2008 write(netfd, buf, cnt) == cnt) 2009 byte_count += cnt; 2010 transflag = 0; 2011 (void)free(buf); 2012 if (cnt != 0) { 2013 if (cnt < 0) 2014 goto file_err; 2015 goto data_err; 2016 } 2017 reply(226, "Transfer complete."); 2018 return (0); 2019 default: 2020 transflag = 0; 2021 reply(550, "Unimplemented TYPE %d in send_data", type); 2022 return (-1); 2023 } 2024 2025data_err: 2026 transflag = 0; 2027 perror_reply(426, "Data connection"); 2028 return (-1); 2029 2030file_err: 2031 transflag = 0; 2032 perror_reply(551, "Error on input file"); 2033 return (-1); 2034 2035got_oob: 2036 myoob(); 2037 recvurg = 0; 2038 transflag = 0; 2039 return (-1); 2040} 2041 2042/* 2043 * Transfer data from peer to "outstr" using the appropriate encapulation of 2044 * the data subject to Mode, Structure, and Type. 2045 * 2046 * N.B.: Form isn't handled. 2047 */ 2048static int 2049receive_data(FILE *instr, FILE *outstr) 2050{ 2051 int c; 2052 int cnt, bare_lfs; 2053 char buf[BUFSIZ]; 2054 2055 transflag++; 2056 bare_lfs = 0; 2057 2058 switch (type) { 2059 2060 case TYPE_I: 2061 case TYPE_L: 2062 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 2063 if (recvurg) 2064 goto got_oob; 2065 if (write(fileno(outstr), buf, cnt) != cnt) 2066 goto file_err; 2067 byte_count += cnt; 2068 } 2069 if (recvurg) 2070 goto got_oob; 2071 if (cnt < 0) 2072 goto data_err; 2073 transflag = 0; 2074 return (0); 2075 2076 case TYPE_E: 2077 reply(553, "TYPE E not implemented."); 2078 transflag = 0; 2079 return (-1); 2080 2081 case TYPE_A: 2082 while ((c = getc(instr)) != EOF) { 2083 if (recvurg) 2084 goto got_oob; 2085 byte_count++; 2086 if (c == '\n') 2087 bare_lfs++; 2088 while (c == '\r') { 2089 if (ferror(outstr)) 2090 goto data_err; 2091 if ((c = getc(instr)) != '\n') { 2092 (void) putc ('\r', outstr); 2093 if (c == '\0' || c == EOF) 2094 goto contin2; 2095 } 2096 } 2097 (void) putc(c, outstr); 2098 contin2: ; 2099 } 2100 if (recvurg) 2101 goto got_oob; 2102 fflush(outstr); 2103 if (ferror(instr)) 2104 goto data_err; 2105 if (ferror(outstr)) 2106 goto file_err; 2107 transflag = 0; 2108 if (bare_lfs) { 2109 lreply(226, 2110 "WARNING! %d bare linefeeds received in ASCII mode", 2111 bare_lfs); 2112 (void)printf(" File may not have transferred correctly.\r\n"); 2113 } 2114 return (0); 2115 default: 2116 reply(550, "Unimplemented TYPE %d in receive_data", type); 2117 transflag = 0; 2118 return (-1); 2119 } 2120 2121data_err: 2122 transflag = 0; 2123 perror_reply(426, "Data Connection"); 2124 return (-1); 2125 2126file_err: 2127 transflag = 0; 2128 perror_reply(452, "Error writing file"); 2129 return (-1); 2130 2131got_oob: 2132 myoob(); 2133 recvurg = 0; 2134 transflag = 0; 2135 return (-1); 2136} 2137 2138void 2139statfilecmd(char *filename) 2140{ 2141 FILE *fin; 2142 int atstart; 2143 int c; 2144 char line[LINE_MAX]; 2145 2146 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2147 fin = ftpd_popen(line, "r"); 2148 lreply(211, "status of %s:", filename); 2149 atstart = 1; 2150 while ((c = getc(fin)) != EOF) { 2151 if (c == '\n') { 2152 if (ferror(stdout)){ 2153 perror_reply(421, "control connection"); 2154 (void) ftpd_pclose(fin); 2155 dologout(1); 2156 /* NOTREACHED */ 2157 } 2158 if (ferror(fin)) { 2159 perror_reply(551, filename); 2160 (void) ftpd_pclose(fin); 2161 return; 2162 } 2163 (void) putc('\r', stdout); 2164 } 2165 /* 2166 * RFC 959 says neutral text should be prepended before 2167 * a leading 3-digit number followed by whitespace, but 2168 * many ftp clients can be confused by any leading digits, 2169 * as a matter of fact. 2170 */ 2171 if (atstart && isdigit(c)) 2172 (void) putc(' ', stdout); 2173 (void) putc(c, stdout); 2174 atstart = (c == '\n'); 2175 } 2176 (void) ftpd_pclose(fin); 2177 reply(211, "End of Status"); 2178} 2179 2180void 2181statcmd(void) 2182{ 2183 union sockunion *su; 2184 u_char *a, *p; 2185 char hname[NI_MAXHOST]; 2186 int ispassive; 2187 2188 lreply(211, "%s FTP server status:", hostname); 2189 printf(" %s\r\n", version); 2190 printf(" Connected to %s", remotehost); 2191 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2192 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2193 if (strcmp(hname, remotehost) != 0) 2194 printf(" (%s)", hname); 2195 } 2196 printf("\r\n"); 2197 if (logged_in) { 2198 if (guest) 2199 printf(" Logged in anonymously\r\n"); 2200 else 2201 printf(" Logged in as %s\r\n", pw->pw_name); 2202 } else if (askpasswd) 2203 printf(" Waiting for password\r\n"); 2204 else 2205 printf(" Waiting for user name\r\n"); 2206 printf(" TYPE: %s", typenames[type]); 2207 if (type == TYPE_A || type == TYPE_E) 2208 printf(", FORM: %s", formnames[form]); 2209 if (type == TYPE_L) 2210#if CHAR_BIT == 8 2211 printf(" %d", CHAR_BIT); 2212#else 2213 printf(" %d", bytesize); /* need definition! */ 2214#endif 2215 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2216 strunames[stru], modenames[mode]); 2217 if (data != -1) 2218 printf(" Data connection open\r\n"); 2219 else if (pdata != -1) { 2220 ispassive = 1; 2221 su = &pasv_addr; 2222 goto printaddr; 2223 } else if (usedefault == 0) { 2224 ispassive = 0; 2225 su = &data_dest; 2226printaddr: 2227#define UC(b) (((int) b) & 0xff) 2228 if (epsvall) { 2229 printf(" EPSV only mode (EPSV ALL)\r\n"); 2230 goto epsvonly; 2231 } 2232 2233 /* PORT/PASV */ 2234 if (su->su_family == AF_INET) { 2235 a = (u_char *) &su->su_sin.sin_addr; 2236 p = (u_char *) &su->su_sin.sin_port; 2237 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2238 ispassive ? "PASV" : "PORT", 2239 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2240 UC(p[0]), UC(p[1])); 2241 } 2242 2243 /* LPRT/LPSV */ 2244 { 2245 int alen, af, i; 2246 2247 switch (su->su_family) { 2248 case AF_INET: 2249 a = (u_char *) &su->su_sin.sin_addr; 2250 p = (u_char *) &su->su_sin.sin_port; 2251 alen = sizeof(su->su_sin.sin_addr); 2252 af = 4; 2253 break; 2254 case AF_INET6: 2255 a = (u_char *) &su->su_sin6.sin6_addr; 2256 p = (u_char *) &su->su_sin6.sin6_port; 2257 alen = sizeof(su->su_sin6.sin6_addr); 2258 af = 6; 2259 break; 2260 default: 2261 af = 0; 2262 break; 2263 } 2264 if (af) { 2265 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2266 af, alen); 2267 for (i = 0; i < alen; i++) 2268 printf("%d,", UC(a[i])); 2269 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2270 } 2271 } 2272 2273epsvonly:; 2274 /* EPRT/EPSV */ 2275 { 2276 int af; 2277 2278 switch (su->su_family) { 2279 case AF_INET: 2280 af = 1; 2281 break; 2282 case AF_INET6: 2283 af = 2; 2284 break; 2285 default: 2286 af = 0; 2287 break; 2288 } 2289 if (af) { 2290 union sockunion tmp; 2291 2292 tmp = *su; 2293 if (tmp.su_family == AF_INET6) 2294 tmp.su_sin6.sin6_scope_id = 0; 2295 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2296 hname, sizeof(hname) - 1, NULL, 0, 2297 NI_NUMERICHOST)) { 2298 printf(" %s |%d|%s|%d|\r\n", 2299 ispassive ? "EPSV" : "EPRT", 2300 af, hname, htons(tmp.su_port)); 2301 } 2302 } 2303 } 2304#undef UC 2305 } else 2306 printf(" No data connection\r\n"); 2307 reply(211, "End of status"); 2308} 2309 2310void 2311fatalerror(char *s) 2312{ 2313 2314 reply(451, "Error in server: %s\n", s); 2315 reply(221, "Closing connection due to server error."); 2316 dologout(0); 2317 /* NOTREACHED */ 2318} 2319 2320void 2321reply(int n, const char *fmt, ...) 2322{ 2323 va_list ap; 2324 2325 va_start(ap, fmt); 2326 (void)printf("%d ", n); 2327 (void)vprintf(fmt, ap); 2328 (void)printf("\r\n"); 2329 (void)fflush(stdout); 2330 if (ftpdebug) { 2331 syslog(LOG_DEBUG, "<--- %d ", n); 2332 vsyslog(LOG_DEBUG, fmt, ap); 2333 } 2334} 2335 2336void 2337lreply(int n, const char *fmt, ...) 2338{ 2339 va_list ap; 2340 2341 va_start(ap, fmt); 2342 (void)printf("%d- ", n); 2343 (void)vprintf(fmt, ap); 2344 (void)printf("\r\n"); 2345 (void)fflush(stdout); 2346 if (ftpdebug) { 2347 syslog(LOG_DEBUG, "<--- %d- ", n); 2348 vsyslog(LOG_DEBUG, fmt, ap); 2349 } 2350} 2351 2352static void 2353ack(char *s) 2354{ 2355 2356 reply(250, "%s command successful.", s); 2357} 2358 2359void 2360nack(char *s) 2361{ 2362 2363 reply(502, "%s command not implemented.", s); 2364} 2365 2366/* ARGSUSED */ 2367void 2368yyerror(char *s) 2369{ 2370 char *cp; 2371 2372 if ((cp = strchr(cbuf,'\n'))) 2373 *cp = '\0'; 2374 reply(500, "'%s': command not understood.", cbuf); 2375} 2376 2377void 2378delete(char *name) 2379{ 2380 struct stat st; 2381 2382 LOGCMD("delete", name); 2383 if (lstat(name, &st) < 0) { 2384 perror_reply(550, name); 2385 return; 2386 } 2387 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2388 if (rmdir(name) < 0) { 2389 perror_reply(550, name); 2390 return; 2391 } 2392 goto done; 2393 } 2394 if (unlink(name) < 0) { 2395 perror_reply(550, name); 2396 return; 2397 } 2398done: 2399 ack("DELE"); 2400} 2401 2402void 2403cwd(char *path) 2404{ 2405 2406 if (chdir(path) < 0) 2407 perror_reply(550, path); 2408 else 2409 ack("CWD"); 2410} 2411 2412void 2413makedir(char *name) 2414{ 2415 char *s; 2416 2417 LOGCMD("mkdir", name); 2418 if (guest && noguestmkd) 2419 reply(550, "%s: permission denied", name); 2420 else if (mkdir(name, 0777) < 0) 2421 perror_reply(550, name); 2422 else { 2423 if ((s = doublequote(name)) == NULL) 2424 fatalerror("Ran out of memory."); 2425 reply(257, "\"%s\" directory created.", s); 2426 free(s); 2427 } 2428} 2429 2430void 2431removedir(char *name) 2432{ 2433 2434 LOGCMD("rmdir", name); 2435 if (rmdir(name) < 0) 2436 perror_reply(550, name); 2437 else 2438 ack("RMD"); 2439} 2440 2441void 2442pwd(void) 2443{ 2444 char *s, path[MAXPATHLEN + 1]; 2445 2446 if (getwd(path) == (char *)NULL) 2447 reply(550, "%s.", path); 2448 else { 2449 if ((s = doublequote(path)) == NULL) 2450 fatalerror("Ran out of memory."); 2451 reply(257, "\"%s\" is current directory.", s); 2452 free(s); 2453 } 2454} 2455 2456char * 2457renamefrom(char *name) 2458{ 2459 struct stat st; 2460 2461 if (lstat(name, &st) < 0) { 2462 perror_reply(550, name); 2463 return ((char *)0); 2464 } 2465 reply(350, "File exists, ready for destination name"); 2466 return (name); 2467} 2468 2469void 2470renamecmd(char *from, char *to) 2471{ 2472 struct stat st; 2473 2474 LOGCMD2("rename", from, to); 2475 2476 if (guest && (stat(to, &st) == 0)) { 2477 reply(550, "%s: permission denied", to); 2478 return; 2479 } 2480 2481 if (rename(from, to) < 0) 2482 perror_reply(550, "rename"); 2483 else 2484 ack("RNTO"); 2485} 2486 2487static void 2488dolog(struct sockaddr *who) 2489{ 2490 int error; 2491 2492 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2493 2494#ifdef SETPROCTITLE 2495#ifdef VIRTUAL_HOSTING 2496 if (thishost != firsthost) 2497 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2498 remotehost, hostname); 2499 else 2500#endif 2501 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2502 remotehost); 2503 setproctitle("%s", proctitle); 2504#endif /* SETPROCTITLE */ 2505 2506 if (logging) { 2507#ifdef VIRTUAL_HOSTING 2508 if (thishost != firsthost) 2509 syslog(LOG_INFO, "connection from %s (to %s)", 2510 remotehost, hostname); 2511 else 2512#endif 2513 { 2514 char who_name[MAXHOSTNAMELEN]; 2515 2516 error = getnameinfo(who, who->sa_len, 2517 who_name, sizeof(who_name) - 1, 2518 NULL, 0, NI_NUMERICHOST); 2519 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2520 error == 0 ? who_name : ""); 2521 } 2522 } 2523} 2524 2525/* 2526 * Record logout in wtmp file 2527 * and exit with supplied status. 2528 */ 2529void 2530dologout(int status) 2531{ 2532 /* 2533 * Prevent reception of SIGURG from resulting in a resumption 2534 * back to the main program loop. 2535 */ 2536 transflag = 0; 2537 2538 if (logged_in && dowtmp) { 2539 (void) seteuid((uid_t)0); 2540 ftpd_logwtmp(ttyline, "", NULL); 2541 } 2542 /* beware of flushing buffers after a SIGPIPE */ 2543 _exit(status); 2544} 2545 2546static void 2547sigurg(int signo) 2548{ 2549 2550 recvurg = 1; 2551} 2552 2553static void 2554myoob(void) 2555{ 2556 char *cp; 2557 2558 /* only process if transfer occurring */ 2559 if (!transflag) 2560 return; 2561 cp = tmpline; 2562 if (getline(cp, 7, stdin) == NULL) { 2563 reply(221, "You could at least say goodbye."); 2564 dologout(0); 2565 } 2566 upper(cp); 2567 if (strcmp(cp, "ABOR\r\n") == 0) { 2568 tmpline[0] = '\0'; 2569 reply(426, "Transfer aborted. Data connection closed."); 2570 reply(226, "Abort successful"); 2571 } 2572 if (strcmp(cp, "STAT\r\n") == 0) { 2573 tmpline[0] = '\0'; 2574 if (file_size != (off_t) -1) 2575 reply(213, "Status: %qd of %qd bytes transferred", 2576 byte_count, file_size); 2577 else 2578 reply(213, "Status: %qd bytes transferred", byte_count); 2579 } 2580} 2581 2582/* 2583 * Note: a response of 425 is not mentioned as a possible response to 2584 * the PASV command in RFC959. However, it has been blessed as 2585 * a legitimate response by Jon Postel in a telephone conversation 2586 * with Rick Adams on 25 Jan 89. 2587 */ 2588void 2589passive(void) 2590{ 2591 int len, on; 2592 char *p, *a; 2593 2594 if (pdata >= 0) /* close old port if one set */ 2595 close(pdata); 2596 2597 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2598 if (pdata < 0) { 2599 perror_reply(425, "Can't open passive connection"); 2600 return; 2601 } 2602 on = 1; 2603 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2604 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2605 2606 (void) seteuid((uid_t)0); 2607 2608#ifdef IP_PORTRANGE 2609 if (ctrl_addr.su_family == AF_INET) { 2610 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2611 : IP_PORTRANGE_DEFAULT; 2612 2613 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2614 &on, sizeof(on)) < 0) 2615 goto pasv_error; 2616 } 2617#endif 2618#ifdef IPV6_PORTRANGE 2619 if (ctrl_addr.su_family == AF_INET6) { 2620 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2621 : IPV6_PORTRANGE_DEFAULT; 2622 2623 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2624 &on, sizeof(on)) < 0) 2625 goto pasv_error; 2626 } 2627#endif 2628 2629 pasv_addr = ctrl_addr; 2630 pasv_addr.su_port = 0; 2631 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2632 goto pasv_error; 2633 2634 (void) seteuid((uid_t)pw->pw_uid); 2635 2636 len = sizeof(pasv_addr); 2637 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2638 goto pasv_error; 2639 if (listen(pdata, 1) < 0) 2640 goto pasv_error; 2641 if (pasv_addr.su_family == AF_INET) 2642 a = (char *) &pasv_addr.su_sin.sin_addr; 2643 else if (pasv_addr.su_family == AF_INET6 && 2644 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2645 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2646 else 2647 goto pasv_error; 2648 2649 p = (char *) &pasv_addr.su_port; 2650 2651#define UC(b) (((int) b) & 0xff) 2652 2653 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2654 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2655 return; 2656 2657pasv_error: 2658 (void) seteuid((uid_t)pw->pw_uid); 2659 (void) close(pdata); 2660 pdata = -1; 2661 perror_reply(425, "Can't open passive connection"); 2662 return; 2663} 2664 2665/* 2666 * Long Passive defined in RFC 1639. 2667 * 228 Entering Long Passive Mode 2668 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2669 */ 2670 2671void 2672long_passive(char *cmd, int pf) 2673{ 2674 int len, on; 2675 char *p, *a; 2676 2677 if (pdata >= 0) /* close old port if one set */ 2678 close(pdata); 2679 2680 if (pf != PF_UNSPEC) { 2681 if (ctrl_addr.su_family != pf) { 2682 switch (ctrl_addr.su_family) { 2683 case AF_INET: 2684 pf = 1; 2685 break; 2686 case AF_INET6: 2687 pf = 2; 2688 break; 2689 default: 2690 pf = 0; 2691 break; 2692 } 2693 /* 2694 * XXX 2695 * only EPRT/EPSV ready clients will understand this 2696 */ 2697 if (strcmp(cmd, "EPSV") == 0 && pf) { 2698 reply(522, "Network protocol mismatch, " 2699 "use (%d)", pf); 2700 } else 2701 reply(501, "Network protocol mismatch"); /*XXX*/ 2702 2703 return; 2704 } 2705 } 2706 2707 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2708 if (pdata < 0) { 2709 perror_reply(425, "Can't open passive connection"); 2710 return; 2711 } 2712 on = 1; 2713 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2714 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2715 2716 (void) seteuid((uid_t)0); 2717 2718 pasv_addr = ctrl_addr; 2719 pasv_addr.su_port = 0; 2720 len = pasv_addr.su_len; 2721 2722#ifdef IP_PORTRANGE 2723 if (ctrl_addr.su_family == AF_INET) { 2724 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2725 : IP_PORTRANGE_DEFAULT; 2726 2727 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2728 &on, sizeof(on)) < 0) 2729 goto pasv_error; 2730 } 2731#endif 2732#ifdef IPV6_PORTRANGE 2733 if (ctrl_addr.su_family == AF_INET6) { 2734 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2735 : IPV6_PORTRANGE_DEFAULT; 2736 2737 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2738 &on, sizeof(on)) < 0) 2739 goto pasv_error; 2740 } 2741#endif 2742 2743 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2744 goto pasv_error; 2745 2746 (void) seteuid((uid_t)pw->pw_uid); 2747 2748 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2749 goto pasv_error; 2750 if (listen(pdata, 1) < 0) 2751 goto pasv_error; 2752 2753#define UC(b) (((int) b) & 0xff) 2754 2755 if (strcmp(cmd, "LPSV") == 0) { 2756 p = (char *)&pasv_addr.su_port; 2757 switch (pasv_addr.su_family) { 2758 case AF_INET: 2759 a = (char *) &pasv_addr.su_sin.sin_addr; 2760 v4_reply: 2761 reply(228, 2762"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2763 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2764 2, UC(p[0]), UC(p[1])); 2765 return; 2766 case AF_INET6: 2767 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2768 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2769 goto v4_reply; 2770 } 2771 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2772 reply(228, 2773"Entering Long Passive Mode " 2774"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2775 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2776 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2777 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2778 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2779 2, UC(p[0]), UC(p[1])); 2780 return; 2781 } 2782 } else if (strcmp(cmd, "EPSV") == 0) { 2783 switch (pasv_addr.su_family) { 2784 case AF_INET: 2785 case AF_INET6: 2786 reply(229, "Entering Extended Passive Mode (|||%d|)", 2787 ntohs(pasv_addr.su_port)); 2788 return; 2789 } 2790 } else { 2791 /* more proper error code? */ 2792 } 2793 2794pasv_error: 2795 (void) seteuid((uid_t)pw->pw_uid); 2796 (void) close(pdata); 2797 pdata = -1; 2798 perror_reply(425, "Can't open passive connection"); 2799 return; 2800} 2801 2802/* 2803 * Generate unique name for file with basename "local" 2804 * and open the file in order to avoid possible races. 2805 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2806 * Return descriptor to the file, set "name" to its name. 2807 * 2808 * Generates failure reply on error. 2809 */ 2810static int 2811guniquefd(char *local, char **name) 2812{ 2813 static char new[MAXPATHLEN]; 2814 struct stat st; 2815 char *cp; 2816 int count; 2817 int fd; 2818 2819 cp = strrchr(local, '/'); 2820 if (cp) 2821 *cp = '\0'; 2822 if (stat(cp ? local : ".", &st) < 0) { 2823 perror_reply(553, cp ? local : "."); 2824 return (-1); 2825 } 2826 if (cp) { 2827 /* 2828 * Let not overwrite dirname with counter suffix. 2829 * -4 is for /nn\0 2830 * In this extreme case dot won't be put in front of suffix. 2831 */ 2832 if (strlen(local) > sizeof(new) - 4) { 2833 reply(553, "Pathname too long"); 2834 return (-1); 2835 } 2836 *cp = '/'; 2837 } 2838 /* -4 is for the .nn<null> we put on the end below */ 2839 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2840 cp = new + strlen(new); 2841 /* 2842 * Don't generate dotfile unless requested explicitly. 2843 * This covers the case when basename gets truncated off 2844 * by buffer size. 2845 */ 2846 if (cp > new && cp[-1] != '/') 2847 *cp++ = '.'; 2848 for (count = 0; count < 100; count++) { 2849 /* At count 0 try unmodified name */ 2850 if (count) 2851 (void)sprintf(cp, "%d", count); 2852 if ((fd = open(count ? new : local, 2853 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2854 *name = count ? new : local; 2855 return (fd); 2856 } 2857 } 2858 reply(452, "Unique file name cannot be created."); 2859 return (-1); 2860} 2861 2862/* 2863 * Format and send reply containing system error number. 2864 */ 2865void 2866perror_reply(int code, char *string) 2867{ 2868 2869 reply(code, "%s: %s.", string, strerror(errno)); 2870} 2871 2872static char *onefile[] = { 2873 "", 2874 0 2875}; 2876 2877void 2878send_file_list(char *whichf) 2879{ 2880 struct stat st; 2881 DIR *dirp = NULL; 2882 struct dirent *dir; 2883 FILE *dout = NULL; 2884 char **dirlist, *dirname; 2885 int simple = 0; 2886 int freeglob = 0; 2887 glob_t gl; 2888 2889 if (strpbrk(whichf, "~{[*?") != NULL) { 2890 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2891 2892 memset(&gl, 0, sizeof(gl)); 2893 gl.gl_matchc = MAXGLOBARGS; 2894 flags |= GLOB_LIMIT; 2895 freeglob = 1; 2896 if (glob(whichf, flags, 0, &gl)) { 2897 reply(550, "not found"); 2898 goto out; 2899 } else if (gl.gl_pathc == 0) { 2900 errno = ENOENT; 2901 perror_reply(550, whichf); 2902 goto out; 2903 } 2904 dirlist = gl.gl_pathv; 2905 } else { 2906 onefile[0] = whichf; 2907 dirlist = onefile; 2908 simple = 1; 2909 } 2910 2911 while ((dirname = *dirlist++)) { 2912 if (stat(dirname, &st) < 0) { 2913 /* 2914 * If user typed "ls -l", etc, and the client 2915 * used NLST, do what the user meant. 2916 */ 2917 if (dirname[0] == '-' && *dirlist == NULL && 2918 transflag == 0) { 2919 retrieve(_PATH_LS " %s", dirname); 2920 goto out; 2921 } 2922 perror_reply(550, whichf); 2923 if (dout != NULL) { 2924 (void) fclose(dout); 2925 transflag = 0; 2926 data = -1; 2927 pdata = -1; 2928 } 2929 goto out; 2930 } 2931 2932 if (S_ISREG(st.st_mode)) { 2933 if (dout == NULL) { 2934 dout = dataconn("file list", (off_t)-1, "w"); 2935 if (dout == NULL) 2936 goto out; 2937 transflag++; 2938 } 2939 fprintf(dout, "%s%s\n", dirname, 2940 type == TYPE_A ? "\r" : ""); 2941 byte_count += strlen(dirname) + 1; 2942 continue; 2943 } else if (!S_ISDIR(st.st_mode)) 2944 continue; 2945 2946 if ((dirp = opendir(dirname)) == NULL) 2947 continue; 2948 2949 while ((dir = readdir(dirp)) != NULL) { 2950 char nbuf[MAXPATHLEN]; 2951 2952 if (recvurg) { 2953 myoob(); 2954 recvurg = 0; 2955 transflag = 0; 2956 goto out; 2957 } 2958 2959 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2960 continue; 2961 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2962 dir->d_namlen == 2) 2963 continue; 2964 2965 snprintf(nbuf, sizeof(nbuf), 2966 "%s/%s", dirname, dir->d_name); 2967 2968 /* 2969 * We have to do a stat to insure it's 2970 * not a directory or special file. 2971 */ 2972 if (simple || (stat(nbuf, &st) == 0 && 2973 S_ISREG(st.st_mode))) { 2974 if (dout == NULL) { 2975 dout = dataconn("file list", (off_t)-1, 2976 "w"); 2977 if (dout == NULL) 2978 goto out; 2979 transflag++; 2980 } 2981 if (nbuf[0] == '.' && nbuf[1] == '/') 2982 fprintf(dout, "%s%s\n", &nbuf[2], 2983 type == TYPE_A ? "\r" : ""); 2984 else 2985 fprintf(dout, "%s%s\n", nbuf, 2986 type == TYPE_A ? "\r" : ""); 2987 byte_count += strlen(nbuf) + 1; 2988 } 2989 } 2990 (void) closedir(dirp); 2991 } 2992 2993 if (dout == NULL) 2994 reply(550, "No files found."); 2995 else if (ferror(dout) != 0) 2996 perror_reply(550, "Data connection"); 2997 else 2998 reply(226, "Transfer complete."); 2999 3000 transflag = 0; 3001 if (dout != NULL) 3002 (void) fclose(dout); 3003 data = -1; 3004 pdata = -1; 3005out: 3006 if (freeglob) { 3007 freeglob = 0; 3008 globfree(&gl); 3009 } 3010} 3011 3012void 3013reapchild(int signo) 3014{ 3015 while (wait3(NULL, WNOHANG, NULL) > 0); 3016} 3017 3018#ifdef OLD_SETPROCTITLE 3019/* 3020 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3021 * Warning, since this is usually started from inetd.conf, it often doesn't 3022 * have much of an environment or arglist to overwrite. 3023 */ 3024void 3025setproctitle(const char *fmt, ...) 3026{ 3027 int i; 3028 va_list ap; 3029 char *p, *bp, ch; 3030 char buf[LINE_MAX]; 3031 3032 va_start(ap, fmt); 3033 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3034 3035 /* make ps print our process name */ 3036 p = Argv[0]; 3037 *p++ = '-'; 3038 3039 i = strlen(buf); 3040 if (i > LastArgv - p - 2) { 3041 i = LastArgv - p - 2; 3042 buf[i] = '\0'; 3043 } 3044 bp = buf; 3045 while (ch = *bp++) 3046 if (ch != '\n' && ch != '\r') 3047 *p++ = ch; 3048 while (p < LastArgv) 3049 *p++ = ' '; 3050} 3051#endif /* OLD_SETPROCTITLE */ 3052 3053static void 3054logxfer(char *name, off_t size, time_t start) 3055{ 3056 char buf[1024]; 3057 char path[MAXPATHLEN + 1]; 3058 time_t now; 3059 3060 if (statfd >= 0 && getwd(path) != NULL) { 3061 time(&now); 3062 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n", 3063 ctime(&now)+4, ident, remotehost, 3064 path, name, (long long)size, 3065 (long)(now - start + (now == start))); 3066 write(statfd, buf, strlen(buf)); 3067 } 3068} 3069 3070static char * 3071doublequote(char *s) 3072{ 3073 int n; 3074 char *p, *s2; 3075 3076 for (p = s, n = 0; *p; p++) 3077 if (*p == '"') 3078 n++; 3079 3080 if ((s2 = malloc(p - s + n + 1)) == NULL) 3081 return (NULL); 3082 3083 for (p = s2; *s; s++, p++) { 3084 if ((*p = *s) == '"') 3085 *(++p) = '"'; 3086 } 3087 *p = '\0'; 3088 3089 return (s2); 3090} 3091