ftpd.c revision 80525
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 80525 2001-07-29 00:52:37Z mikeh $"; 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#ifdef USE_PAM 82#include <opie.h> /* XXX */ 83#endif 84#include <setjmp.h> 85#include <signal.h> 86#include <stdio.h> 87#include <stdlib.h> 88#include <string.h> 89#include <syslog.h> 90#include <time.h> 91#include <unistd.h> 92#include <libutil.h> 93#ifdef LOGIN_CAP 94#include <login_cap.h> 95#endif 96 97#ifdef USE_PAM 98#include <security/pam_appl.h> 99#endif 100 101#include "pathnames.h" 102#include "extern.h" 103 104#if __STDC__ 105#include <stdarg.h> 106#else 107#include <varargs.h> 108#endif 109 110static char version[] = "Version 6.00LS"; 111#undef main 112 113/* wrapper for KAME-special getnameinfo() */ 114#ifndef NI_WITHSCOPEID 115#define NI_WITHSCOPEID 0 116#endif 117 118extern off_t restart_point; 119extern char cbuf[]; 120 121union sockunion server_addr; 122union sockunion ctrl_addr; 123union sockunion data_source; 124union sockunion data_dest; 125union sockunion his_addr; 126union sockunion pasv_addr; 127 128int daemon_mode; 129int data; 130jmp_buf errcatch, urgcatch; 131int logged_in; 132struct passwd *pw; 133int ftpdebug; 134int timeout = 900; /* timeout after 15 minutes of inactivity */ 135int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 136int logging; 137int restricted_data_ports = 1; 138int paranoid = 1; /* be extra careful about security */ 139int anon_only = 0; /* Only anonymous ftp allowed */ 140int guest; 141int dochroot; 142int stats; 143int statfd = -1; 144int type; 145int form; 146int stru; /* avoid C keyword */ 147int mode; 148int usedefault = 1; /* for data transfers */ 149int pdata = -1; /* for passive mode */ 150int readonly=0; /* Server is in readonly mode. */ 151int noepsv=0; /* EPSV command is disabled. */ 152sig_atomic_t transflag; 153off_t file_size; 154off_t byte_count; 155#if !defined(CMASK) || CMASK == 0 156#undef CMASK 157#define CMASK 027 158#endif 159int defumask = CMASK; /* default umask value */ 160char tmpline[7]; 161char *hostname; 162int epsvall = 0; 163 164#ifdef VIRTUAL_HOSTING 165char *ftpuser; 166 167static struct ftphost { 168 struct ftphost *next; 169 struct addrinfo *hostinfo; 170 char *hostname; 171 char *anonuser; 172 char *statfile; 173 char *welcome; 174 char *loginmsg; 175} *thishost, *firsthost; 176 177#endif 178char remotehost[MAXHOSTNAMELEN]; 179char *ident = NULL; 180 181static char ttyline[20]; 182char *tty = ttyline; /* for klogin */ 183 184#ifdef USE_PAM 185static int auth_pam __P((struct passwd**, const char*)); 186pam_handle_t *pamh = NULL; 187 188/* Kluge because the conversation mechanism has not been threshed out */ 189static struct opie opiedata; 190static char opieprompt[OPIE_CHALLENGE_MAX+1]; 191#endif 192 193char *pid_file = NULL; 194 195/* 196 * Limit number of pathnames that glob can return. 197 * A limit of 0 indicates the number of pathnames is unlimited. 198 */ 199#define MAXGLOBARGS 16384 200# 201 202/* 203 * Timeout intervals for retrying connections 204 * to hosts that don't accept PORT cmds. This 205 * is a kludge, but given the problems with TCP... 206 */ 207#define SWAITMAX 90 /* wait at most 90 seconds */ 208#define SWAITINT 5 /* interval between retries */ 209 210int swaitmax = SWAITMAX; 211int swaitint = SWAITINT; 212 213#ifdef SETPROCTITLE 214#ifdef OLD_SETPROCTITLE 215char **Argv = NULL; /* pointer to argument vector */ 216char *LastArgv = NULL; /* end of argv */ 217#endif /* OLD_SETPROCTITLE */ 218char proctitle[LINE_MAX]; /* initial part of title */ 219#endif /* SETPROCTITLE */ 220 221#define LOGCMD(cmd, file) \ 222 if (logging > 1) \ 223 syslog(LOG_INFO,"%s %s%s", cmd, \ 224 *(file) == '/' ? "" : curdir(), file); 225#define LOGCMD2(cmd, file1, file2) \ 226 if (logging > 1) \ 227 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 228 *(file1) == '/' ? "" : curdir(), file1, \ 229 *(file2) == '/' ? "" : curdir(), file2); 230#define LOGBYTES(cmd, file, cnt) \ 231 if (logging > 1) { \ 232 if (cnt == (off_t)-1) \ 233 syslog(LOG_INFO,"%s %s%s", cmd, \ 234 *(file) == '/' ? "" : curdir(), file); \ 235 else \ 236 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 237 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 238 } 239 240#ifdef VIRTUAL_HOSTING 241static void inithosts __P((void)); 242static void selecthost __P((union sockunion *)); 243#endif 244static void ack __P((char *)); 245static void myoob __P((int)); 246static int checkuser __P((char *, char *, int)); 247static FILE *dataconn __P((char *, off_t, char *)); 248static void dolog __P((struct sockaddr *)); 249static char *curdir __P((void)); 250static void end_login __P((void)); 251static FILE *getdatasock __P((char *)); 252static char *gunique __P((char *)); 253static void lostconn __P((int)); 254static int receive_data __P((FILE *, FILE *)); 255static void send_data __P((FILE *, FILE *, off_t, off_t, int)); 256static struct passwd * 257 sgetpwnam __P((char *)); 258static char *sgetsave __P((char *)); 259static void reapchild __P((int)); 260static void logxfer __P((char *, long, long)); 261 262static char * 263curdir() 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(argc, argv, envp) 277 int argc; 278 char *argv[]; 279 char **envp; 280{ 281 int addrlen, ch, on = 1, tos; 282 char *cp, line[LINE_MAX]; 283 FILE *fd; 284 int error; 285 char *bindname = NULL; 286 int family = AF_UNSPEC; 287 int enable_v4 = 0; 288 289 tzset(); /* in case no timezone database in ~ftp */ 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, "AdlDESURrt:T:u:va:p:46")) != -1) { 303 switch (ch) { 304 case 'D': 305 daemon_mode++; 306 break; 307 308 case 'd': 309 ftpdebug++; 310 break; 311 312 case 'E': 313 noepsv = 1; 314 break; 315 316 case 'l': 317 logging++; /* > 1 == extra logging */ 318 break; 319 320 case 'r': 321 readonly = 1; 322 break; 323 324 case 'R': 325 paranoid = 0; 326 break; 327 328 case 'S': 329 stats++; 330 break; 331 332 case 'T': 333 maxtimeout = atoi(optarg); 334 if (timeout > maxtimeout) 335 timeout = maxtimeout; 336 break; 337 338 case 't': 339 timeout = atoi(optarg); 340 if (maxtimeout < timeout) 341 maxtimeout = timeout; 342 break; 343 344 case 'U': 345 restricted_data_ports = 0; 346 break; 347 348 case 'a': 349 bindname = optarg; 350 break; 351 352 case 'p': 353 pid_file = optarg; 354 break; 355 356 case 'u': 357 { 358 long val = 0; 359 360 val = strtol(optarg, &optarg, 8); 361 if (*optarg != '\0' || val < 0) 362 warnx("bad value for -u"); 363 else 364 defumask = val; 365 break; 366 } 367 case 'A': 368 anon_only = 1; 369 break; 370 371 case 'v': 372 ftpdebug = 1; 373 break; 374 375 case '4': 376 enable_v4 = 1; 377 if (family == AF_UNSPEC) 378 family = AF_INET; 379 break; 380 381 case '6': 382 family = AF_INET6; 383 break; 384 385 default: 386 warnx("unknown flag -%c ignored", optopt); 387 break; 388 } 389 } 390 391#ifdef VIRTUAL_HOSTING 392 inithosts(); 393#endif 394 (void) freopen(_PATH_DEVNULL, "w", stderr); 395 396 /* 397 * LOG_NDELAY sets up the logging connection immediately, 398 * necessary for anonymous ftp's that chroot and can't do it later. 399 */ 400 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 401 402 if (daemon_mode) { 403 int ctl_sock, fd; 404 struct addrinfo hints, *res; 405 406 /* 407 * Detach from parent. 408 */ 409 if (daemon(1, 1) < 0) { 410 syslog(LOG_ERR, "failed to become a daemon"); 411 exit(1); 412 } 413 (void) signal(SIGCHLD, reapchild); 414 /* init bind_sa */ 415 memset(&hints, 0, sizeof(hints)); 416 417 hints.ai_family = family == AF_UNSPEC ? AF_INET : family; 418 hints.ai_socktype = SOCK_STREAM; 419 hints.ai_protocol = 0; 420 hints.ai_flags = AI_PASSIVE; 421 error = getaddrinfo(bindname, "ftp", &hints, &res); 422 if (error) { 423 if (family == AF_UNSPEC) { 424 hints.ai_family = AF_UNSPEC; 425 error = getaddrinfo(bindname, "ftp", &hints, 426 &res); 427 } 428 } 429 if (error) { 430 syslog(LOG_ERR, "%s", gai_strerror(error)); 431 if (error == EAI_SYSTEM) 432 syslog(LOG_ERR, "%s", strerror(errno)); 433 exit(1); 434 } 435 if (res->ai_addr == NULL) { 436 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 437 exit(1); 438 } else 439 family = res->ai_addr->sa_family; 440 /* 441 * Open a socket, bind it to the FTP port, and start 442 * listening. 443 */ 444 ctl_sock = socket(family, SOCK_STREAM, 0); 445 if (ctl_sock < 0) { 446 syslog(LOG_ERR, "control socket: %m"); 447 exit(1); 448 } 449 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 450 (char *)&on, sizeof(on)) < 0) 451 syslog(LOG_ERR, "control setsockopt: %m"); 452#ifdef IPV6_BINDV6ONLY 453 if (family == AF_INET6 && enable_v4 == 0) { 454 if (setsockopt(ctl_sock, IPPROTO_IPV6, IPV6_BINDV6ONLY, 455 (char *)&on, sizeof (on)) < 0) 456 syslog(LOG_ERR, 457 "control setsockopt(IPV6_BINDV6ONLY): %m"); 458 } 459#endif /* IPV6_BINDV6ONLY */ 460 memcpy(&server_addr, res->ai_addr, res->ai_addr->sa_len); 461 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 462 server_addr.su_len) < 0) { 463 syslog(LOG_ERR, "control bind: %m"); 464 exit(1); 465 } 466 if (listen(ctl_sock, 32) < 0) { 467 syslog(LOG_ERR, "control listen: %m"); 468 exit(1); 469 } 470 /* 471 * Atomically write process ID 472 */ 473 if (pid_file) 474 { 475 int fd; 476 char buf[20]; 477 478 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 479 | O_NONBLOCK | O_EXLOCK, 0644); 480 if (fd < 0) { 481 if (errno == EAGAIN) 482 errx(1, "%s: file locked", pid_file); 483 else 484 err(1, "%s", pid_file); 485 } 486 snprintf(buf, sizeof(buf), 487 "%lu\n", (unsigned long) getpid()); 488 if (write(fd, buf, strlen(buf)) < 0) 489 err(1, "%s: write", pid_file); 490 /* Leave the pid file open and locked */ 491 } 492 /* 493 * Loop forever accepting connection requests and forking off 494 * children to handle them. 495 */ 496 while (1) { 497 addrlen = server_addr.su_len; 498 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen); 499 if (fork() == 0) { 500 /* child */ 501 (void) dup2(fd, 0); 502 (void) dup2(fd, 1); 503 close(ctl_sock); 504 break; 505 } 506 close(fd); 507 } 508 } else { 509 addrlen = sizeof(his_addr); 510 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 511 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 512 exit(1); 513 } 514 } 515 516 (void) signal(SIGCHLD, SIG_IGN); 517 (void) signal(SIGPIPE, lostconn); 518 if (signal(SIGURG, myoob) == SIG_ERR) 519 syslog(LOG_ERR, "signal: %m"); 520 521 addrlen = sizeof(ctrl_addr); 522 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 523 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 524 exit(1); 525 } 526#ifdef VIRTUAL_HOSTING 527 /* select our identity from virtual host table */ 528 selecthost(&ctrl_addr); 529#endif 530#ifdef IP_TOS 531 if (ctrl_addr.su_family == AF_INET) 532 { 533 tos = IPTOS_LOWDELAY; 534 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 535 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 536 } 537#endif 538 /* 539 * Disable Nagle on the control channel so that we don't have to wait 540 * for peer's ACK before issuing our next reply. 541 */ 542 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 543 syslog(LOG_WARNING, "control setsockopt TCP_NODELAY: %m"); 544 545 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 546 547 /* set this here so klogin can use it... */ 548 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 549 550 /* Try to handle urgent data inline */ 551#ifdef SO_OOBINLINE 552 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 553 syslog(LOG_ERR, "setsockopt: %m"); 554#endif 555 556#ifdef F_SETOWN 557 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 558 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 559#endif 560 dolog((struct sockaddr *)&his_addr); 561 /* 562 * Set up default state 563 */ 564 data = -1; 565 type = TYPE_A; 566 form = FORM_N; 567 stru = STRU_F; 568 mode = MODE_S; 569 tmpline[0] = '\0'; 570 571 /* If logins are disabled, print out the message. */ 572 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 573 while (fgets(line, sizeof(line), fd) != NULL) { 574 if ((cp = strchr(line, '\n')) != NULL) 575 *cp = '\0'; 576 lreply(530, "%s", line); 577 } 578 (void) fflush(stdout); 579 (void) fclose(fd); 580 reply(530, "System not available."); 581 exit(0); 582 } 583#ifdef VIRTUAL_HOSTING 584 if ((fd = fopen(thishost->welcome, "r")) != NULL) { 585#else 586 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 587#endif 588 while (fgets(line, sizeof(line), fd) != NULL) { 589 if ((cp = strchr(line, '\n')) != NULL) 590 *cp = '\0'; 591 lreply(220, "%s", line); 592 } 593 (void) fflush(stdout); 594 (void) fclose(fd); 595 /* reply(220,) must follow */ 596 } 597#ifndef VIRTUAL_HOSTING 598 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 599 fatalerror("Ran out of memory."); 600 (void) gethostname(hostname, MAXHOSTNAMELEN - 1); 601 hostname[MAXHOSTNAMELEN - 1] = '\0'; 602#endif 603 reply(220, "%s FTP server (%s) ready.", hostname, version); 604 (void) setjmp(errcatch); 605 for (;;) 606 (void) yyparse(); 607 /* NOTREACHED */ 608} 609 610static void 611lostconn(signo) 612 int signo; 613{ 614 615 if (ftpdebug) 616 syslog(LOG_DEBUG, "lost connection"); 617 dologout(1); 618} 619 620#ifdef VIRTUAL_HOSTING 621/* 622 * read in virtual host tables (if they exist) 623 */ 624 625static void 626inithosts() 627{ 628 FILE *fp; 629 char *cp; 630 struct ftphost *hrp, *lhrp; 631 char line[1024]; 632 struct addrinfo hints, *res, *ai; 633 634 /* 635 * Fill in the default host information 636 */ 637 if (gethostname(line, sizeof(line)) < 0) 638 line[0] = '\0'; 639 if ((hrp = malloc(sizeof(struct ftphost))) == NULL || 640 (hrp->hostname = strdup(line)) == NULL) 641 fatalerror("Ran out of memory."); 642 hrp->hostinfo = NULL; 643 644 memset(&hints, 0, sizeof(hints)); 645 hints.ai_flags = AI_CANONNAME; 646 hints.ai_family = AF_UNSPEC; 647 getaddrinfo(hrp->hostname, NULL, &hints, &res); 648 if (res) 649 hrp->hostinfo = res; 650 hrp->statfile = _PATH_FTPDSTATFILE; 651 hrp->welcome = _PATH_FTPWELCOME; 652 hrp->loginmsg = _PATH_FTPLOGINMESG; 653 hrp->anonuser = "ftp"; 654 hrp->next = NULL; 655 thishost = firsthost = lhrp = hrp; 656 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 657 int addrsize, error, gothost; 658 void *addr; 659 struct hostent *hp; 660 661 while (fgets(line, sizeof(line), fp) != NULL) { 662 int i, hp_error; 663 664 if ((cp = strchr(line, '\n')) == NULL) { 665 /* ignore long lines */ 666 while (fgets(line, sizeof(line), fp) != NULL && 667 strchr(line, '\n') == NULL) 668 ; 669 continue; 670 } 671 *cp = '\0'; 672 cp = strtok(line, " \t"); 673 /* skip comments and empty lines */ 674 if (cp == NULL || line[0] == '#') 675 continue; 676 677 hints.ai_flags = 0; 678 hints.ai_family = AF_UNSPEC; 679 hints.ai_flags = AI_PASSIVE; 680 error = getaddrinfo(cp, NULL, &hints, &res); 681 if (error != NULL) 682 continue; 683 for (ai = res; ai != NULL && ai->ai_addr != NULL; 684 ai = ai->ai_next) { 685 686 gothost = 0; 687 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 688 struct addrinfo *hi; 689 690 for (hi = hrp->hostinfo; hi != NULL; 691 hi = hi->ai_next) 692 if (hi->ai_addrlen == ai->ai_addrlen && 693 memcmp(hi->ai_addr, 694 ai->ai_addr, 695 ai->ai_addr->sa_len) == 0) { 696 gothost++; 697 break; 698 } 699 if (gothost) 700 break; 701 } 702 if (hrp == NULL) { 703 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 704 continue; 705 /* defaults */ 706 hrp->statfile = _PATH_FTPDSTATFILE; 707 hrp->welcome = _PATH_FTPWELCOME; 708 hrp->loginmsg = _PATH_FTPLOGINMESG; 709 hrp->anonuser = "ftp"; 710 hrp->next = NULL; 711 lhrp->next = hrp; 712 lhrp = hrp; 713 } 714 hrp->hostinfo = res; 715 716 /* 717 * determine hostname to use. 718 * force defined name if there is a valid alias 719 * otherwise fallback to primary hostname 720 */ 721 /* XXX: getaddrinfo() can't do alias check */ 722 switch(hrp->hostinfo->ai_family) { 723 case AF_INET: 724 addr = &((struct sockaddr_in *)&hrp->hostinfo->ai_addr)->sin_addr; 725 addrsize = sizeof(struct sockaddr_in); 726 break; 727 case AF_INET6: 728 addr = &((struct sockaddr_in6 *)&hrp->hostinfo->ai_addr)->sin6_addr; 729 addrsize = sizeof(struct sockaddr_in6); 730 break; 731 default: 732 /* should not reach here */ 733 if (hrp->hostinfo != NULL) 734 freeaddrinfo(hrp->hostinfo); 735 free(hrp); 736 continue; 737 /* NOTREACHED */ 738 } 739 if ((hp = getipnodebyaddr((char*)addr, addrsize, 740 hrp->hostinfo->ai_family, 741 &hp_error)) != NULL) { 742 if (strcmp(cp, hp->h_name) != 0) { 743 if (hp->h_aliases == NULL) 744 cp = hp->h_name; 745 else { 746 i = 0; 747 while (hp->h_aliases[i] && 748 strcmp(cp, hp->h_aliases[i]) != 0) 749 ++i; 750 if (hp->h_aliases[i] == NULL) 751 cp = hp->h_name; 752 } 753 } 754 } 755 hrp->hostname = strdup(cp); 756 freehostent(hp); 757 /* ok, now we now peel off the rest */ 758 i = 0; 759 while (i < 4 && (cp = strtok(NULL, " \t")) != NULL) { 760 if (*cp != '-' && (cp = strdup(cp)) != NULL) { 761 switch (i) { 762 case 0: /* anon user permissions */ 763 hrp->anonuser = cp; 764 break; 765 case 1: /* statistics file */ 766 hrp->statfile = cp; 767 break; 768 case 2: /* welcome message */ 769 hrp->welcome = cp; 770 break; 771 case 3: /* login message */ 772 hrp->loginmsg = cp; 773 break; 774 } 775 } 776 ++i; 777 } 778 /* XXX: re-initialization for getaddrinfo() loop */ 779 cp = strtok(line, " \t"); 780 } 781 } 782 (void) fclose(fp); 783 } 784} 785 786static void 787selecthost(su) 788 union sockunion *su; 789{ 790 struct ftphost *hrp; 791 u_int16_t port; 792#ifdef INET6 793 struct in6_addr *mapped_in6 = NULL; 794#endif 795 struct addrinfo *hi; 796 797#ifdef INET6 798 /* 799 * XXX IPv4 mapped IPv6 addr consideraton, 800 * specified in rfc2373. 801 */ 802 if (su->su_family == AF_INET6 && 803 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 804 mapped_in6 = &su->su_sin6.sin6_addr; 805#endif 806 807 hrp = thishost = firsthost; /* default */ 808 port = su->su_port; 809 su->su_port = 0; 810 while (hrp != NULL) { 811 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 812 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 813 thishost = hrp; 814 break; 815 } 816#ifdef INET6 817 /* XXX IPv4 mapped IPv6 addr consideraton */ 818 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 819 (memcmp(&mapped_in6->s6_addr[12], 820 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 821 sizeof(struct in_addr)) == 0)) { 822 thishost = hrp; 823 break; 824 } 825#endif 826 } 827 hrp = hrp->next; 828 } 829 su->su_port = port; 830 /* setup static variables as appropriate */ 831 hostname = thishost->hostname; 832 ftpuser = thishost->anonuser; 833} 834#endif 835 836/* 837 * Helper function for sgetpwnam(). 838 */ 839static char * 840sgetsave(s) 841 char *s; 842{ 843 char *new = malloc((unsigned) strlen(s) + 1); 844 845 if (new == NULL) { 846 perror_reply(421, "Local resource failure: malloc"); 847 dologout(1); 848 /* NOTREACHED */ 849 } 850 (void) strcpy(new, s); 851 return (new); 852} 853 854/* 855 * Save the result of a getpwnam. Used for USER command, since 856 * the data returned must not be clobbered by any other command 857 * (e.g., globbing). 858 */ 859static struct passwd * 860sgetpwnam(name) 861 char *name; 862{ 863 static struct passwd save; 864 struct passwd *p; 865 866 if ((p = getpwnam(name)) == NULL) 867 return (p); 868 if (save.pw_name) { 869 free(save.pw_name); 870 free(save.pw_passwd); 871 free(save.pw_gecos); 872 free(save.pw_dir); 873 free(save.pw_shell); 874 } 875 save = *p; 876 save.pw_name = sgetsave(p->pw_name); 877 save.pw_passwd = sgetsave(p->pw_passwd); 878 save.pw_gecos = sgetsave(p->pw_gecos); 879 save.pw_dir = sgetsave(p->pw_dir); 880 save.pw_shell = sgetsave(p->pw_shell); 881 return (&save); 882} 883 884static int login_attempts; /* number of failed login attempts */ 885static int askpasswd; /* had user command, ask for passwd */ 886static char curname[MAXLOGNAME]; /* current USER name */ 887 888/* 889 * USER command. 890 * Sets global passwd pointer pw if named account exists and is acceptable; 891 * sets askpasswd if a PASS command is expected. If logged in previously, 892 * need to reset state. If name is "ftp" or "anonymous", the name is not in 893 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 894 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 895 * requesting login privileges. Disallow anyone who does not have a standard 896 * shell as returned by getusershell(). Disallow anyone mentioned in the file 897 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 898 */ 899void 900user(name) 901 char *name; 902{ 903 char *cp, *shell; 904 905 if (logged_in) { 906 if (guest) { 907 reply(530, "Can't change user from guest login."); 908 return; 909 } else if (dochroot) { 910 reply(530, "Can't change user from chroot user."); 911 return; 912 } 913 end_login(); 914 } 915 916 guest = 0; 917 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 918 if (checkuser(_PATH_FTPUSERS, "ftp", 0) || 919 checkuser(_PATH_FTPUSERS, "anonymous", 0)) 920 reply(530, "User %s access denied.", name); 921#ifdef VIRTUAL_HOSTING 922 else if ((pw = sgetpwnam(thishost->anonuser)) != NULL) { 923#else 924 else if ((pw = sgetpwnam("ftp")) != NULL) { 925#endif 926 guest = 1; 927 askpasswd = 1; 928 reply(331, 929 "Guest login ok, send your email address as password."); 930 } else 931 reply(530, "User %s unknown.", name); 932 if (!askpasswd && logging) 933 syslog(LOG_NOTICE, 934 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 935 return; 936 } 937 if (anon_only != 0) { 938 reply(530, "Sorry, only anonymous ftp allowed."); 939 return; 940 } 941 942 if ((pw = sgetpwnam(name))) { 943 if ((shell = pw->pw_shell) == NULL || *shell == 0) 944 shell = _PATH_BSHELL; 945 while ((cp = getusershell()) != NULL) 946 if (strcmp(cp, shell) == 0) 947 break; 948 endusershell(); 949 950 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1)) { 951 reply(530, "User %s access denied.", name); 952 if (logging) 953 syslog(LOG_NOTICE, 954 "FTP LOGIN REFUSED FROM %s, %s", 955 remotehost, name); 956 pw = (struct passwd *) NULL; 957 return; 958 } 959 } 960 if (logging) 961 strncpy(curname, name, sizeof(curname)-1); 962#ifdef USE_PAM 963 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 964 opiechallenge(&opiedata, name, opieprompt); 965 reply(331, "[ %s ] Password required for %s.", opieprompt, name); 966#else 967 reply(331, "Password required for %s.", name); 968#endif 969 askpasswd = 1; 970 /* 971 * Delay before reading passwd after first failed 972 * attempt to slow down passwd-guessing programs. 973 */ 974 if (login_attempts) 975 sleep((unsigned) login_attempts); 976} 977 978/* 979 * Check if a user is in the file "fname" 980 */ 981static int 982checkuser(fname, name, pwset) 983 char *fname; 984 char *name; 985 int pwset; 986{ 987 FILE *fd; 988 int found = 0; 989 char *p, line[BUFSIZ]; 990 991 if ((fd = fopen(fname, "r")) != NULL) { 992 while (!found && fgets(line, sizeof(line), fd) != NULL) 993 if ((p = strchr(line, '\n')) != NULL) { 994 *p = '\0'; 995 if (line[0] == '#') 996 continue; 997 /* 998 * if first chr is '@', check group membership 999 */ 1000 if (line[0] == '@') { 1001 int i = 0; 1002 struct group *grp; 1003 1004 if ((grp = getgrnam(line+1)) == NULL) 1005 continue; 1006 /* 1007 * Check user's default group 1008 */ 1009 if (pwset && grp->gr_gid == pw->pw_gid) 1010 found = 1; 1011 /* 1012 * Check supplementary groups 1013 */ 1014 while (!found && grp->gr_mem[i]) 1015 found = strcmp(name, 1016 grp->gr_mem[i++]) 1017 == 0; 1018 } 1019 /* 1020 * Otherwise, just check for username match 1021 */ 1022 else 1023 found = strcmp(line, name) == 0; 1024 } 1025 (void) fclose(fd); 1026 } 1027 return (found); 1028} 1029 1030/* 1031 * Terminate login as previous user, if any, resetting state; 1032 * used when USER command is given or login fails. 1033 */ 1034static void 1035end_login() 1036{ 1037#ifdef USE_PAM 1038 int e; 1039#endif 1040 1041 (void) seteuid((uid_t)0); 1042 if (logged_in) 1043 ftpd_logwtmp(ttyline, "", ""); 1044 pw = NULL; 1045#ifdef LOGIN_CAP 1046 setusercontext(NULL, getpwuid(0), (uid_t)0, 1047 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1048#endif 1049#ifdef USE_PAM 1050 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1051 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1052 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1053 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1054 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1055 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1056 pamh = NULL; 1057#endif 1058 logged_in = 0; 1059 guest = 0; 1060 dochroot = 0; 1061} 1062 1063#ifdef USE_PAM 1064 1065/* 1066 * the following code is stolen from imap-uw PAM authentication module and 1067 * login.c 1068 */ 1069#define COPY_STRING(s) (s ? strdup(s) : NULL) 1070 1071struct cred_t { 1072 const char *uname; /* user name */ 1073 const char *pass; /* password */ 1074}; 1075typedef struct cred_t cred_t; 1076 1077static int 1078auth_conv(int num_msg, const struct pam_message **msg, 1079 struct pam_response **resp, void *appdata) 1080{ 1081 int i; 1082 cred_t *cred = (cred_t *) appdata; 1083 struct pam_response *reply = 1084 malloc(sizeof(struct pam_response) * num_msg); 1085 1086 for (i = 0; i < num_msg; i++) { 1087 switch (msg[i]->msg_style) { 1088 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1089 reply[i].resp_retcode = PAM_SUCCESS; 1090 reply[i].resp = COPY_STRING(cred->uname); 1091 /* PAM frees resp. */ 1092 break; 1093 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1094 reply[i].resp_retcode = PAM_SUCCESS; 1095 reply[i].resp = COPY_STRING(cred->pass); 1096 /* PAM frees resp. */ 1097 break; 1098 case PAM_TEXT_INFO: 1099 case PAM_ERROR_MSG: 1100 reply[i].resp_retcode = PAM_SUCCESS; 1101 reply[i].resp = NULL; 1102 break; 1103 default: /* unknown message style */ 1104 free(reply); 1105 return PAM_CONV_ERR; 1106 } 1107 } 1108 1109 *resp = reply; 1110 return PAM_SUCCESS; 1111} 1112 1113/* 1114 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1115 * authenticated, or 1 if not authenticated. If some sort of PAM system 1116 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1117 * function returns -1. This can be used as an indication that we should 1118 * fall back to a different authentication mechanism. 1119 */ 1120static int 1121auth_pam(struct passwd **ppw, const char *pass) 1122{ 1123 pam_handle_t *pamh = NULL; 1124 const char *tmpl_user; 1125 const void *item; 1126 int rval; 1127 int e; 1128 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1129 struct pam_conv conv = { &auth_conv, &auth_cred }; 1130 1131 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1132 if (e != PAM_SUCCESS) { 1133 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e)); 1134 return -1; 1135 } 1136 1137 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1138 if (e != PAM_SUCCESS) { 1139 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1140 pam_strerror(pamh, e)); 1141 return -1; 1142 } 1143 1144 e = pam_authenticate(pamh, 0); 1145 switch (e) { 1146 case PAM_SUCCESS: 1147 /* 1148 * With PAM we support the concept of a "template" 1149 * user. The user enters a login name which is 1150 * authenticated by PAM, usually via a remote service 1151 * such as RADIUS or TACACS+. If authentication 1152 * succeeds, a different but related "template" name 1153 * is used for setting the credentials, shell, and 1154 * home directory. The name the user enters need only 1155 * exist on the remote authentication server, but the 1156 * template name must be present in the local password 1157 * database. 1158 * 1159 * This is supported by two various mechanisms in the 1160 * individual modules. However, from the application's 1161 * point of view, the template user is always passed 1162 * back as a changed value of the PAM_USER item. 1163 */ 1164 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1165 PAM_SUCCESS) { 1166 tmpl_user = (const char *) item; 1167 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1168 *ppw = getpwnam(tmpl_user); 1169 } else 1170 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1171 pam_strerror(pamh, e)); 1172 rval = 0; 1173 break; 1174 1175 case PAM_AUTH_ERR: 1176 case PAM_USER_UNKNOWN: 1177 case PAM_MAXTRIES: 1178 rval = 1; 1179 break; 1180 1181 default: 1182 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1183 rval = -1; 1184 break; 1185 } 1186 1187 if (rval == 0) { 1188 e = pam_acct_mgmt(pamh, 0); 1189 if (e == PAM_NEW_AUTHTOK_REQD) { 1190 e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); 1191 if (e != PAM_SUCCESS) { 1192 syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); 1193 rval = 1; 1194 } 1195 } else if (e != PAM_SUCCESS) { 1196 rval = 1; 1197 } 1198 } 1199 1200 if (rval != 0) { 1201 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1202 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1203 } 1204 pamh = NULL; 1205 } 1206 return rval; 1207} 1208 1209#endif /* USE_PAM */ 1210 1211void 1212pass(passwd) 1213 char *passwd; 1214{ 1215 int rval; 1216 FILE *fd; 1217#ifdef LOGIN_CAP 1218 login_cap_t *lc = NULL; 1219#endif 1220#ifdef USE_PAM 1221 int e; 1222#endif 1223 1224 if (logged_in || askpasswd == 0) { 1225 reply(503, "Login with USER first."); 1226 return; 1227 } 1228 askpasswd = 0; 1229 if (!guest) { /* "ftp" is only account allowed no password */ 1230 if (pw == NULL) { 1231 rval = 1; /* failure below */ 1232 goto skip; 1233 } 1234#ifdef USE_PAM 1235 rval = auth_pam(&pw, passwd); 1236 if (rval >= 0) 1237 goto skip; 1238#endif 1239 rval = strcmp(pw->pw_passwd, crypt(passwd, pw->pw_passwd)); 1240 /* The strcmp does not catch null passwords! */ 1241 if (*pw->pw_passwd == '\0' || 1242 (pw->pw_expire && time(NULL) >= pw->pw_expire)) 1243 rval = 1; /* failure */ 1244skip: 1245 /* 1246 * If rval == 1, the user failed the authentication check 1247 * above. If rval == 0, either PAM or local authentication 1248 * succeeded. 1249 */ 1250 if (rval) { 1251 reply(530, "Login incorrect."); 1252 if (logging) 1253 syslog(LOG_NOTICE, 1254 "FTP LOGIN FAILED FROM %s, %s", 1255 remotehost, curname); 1256 pw = NULL; 1257 if (login_attempts++ >= 5) { 1258 syslog(LOG_NOTICE, 1259 "repeated login failures from %s", 1260 remotehost); 1261 exit(0); 1262 } 1263 return; 1264 } 1265 } 1266 login_attempts = 0; /* this time successful */ 1267 if (setegid((gid_t)pw->pw_gid) < 0) { 1268 reply(550, "Can't set gid."); 1269 return; 1270 } 1271 /* May be overridden by login.conf */ 1272 (void) umask(defumask); 1273#ifdef LOGIN_CAP 1274 if ((lc = login_getpwclass(pw)) != NULL) { 1275 char remote_ip[MAXHOSTNAMELEN]; 1276 1277 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1278 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1279 NI_NUMERICHOST|NI_WITHSCOPEID); 1280 remote_ip[sizeof(remote_ip) - 1] = 0; 1281 if (!auth_hostok(lc, remotehost, remote_ip)) { 1282 syslog(LOG_INFO|LOG_AUTH, 1283 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1284 pw->pw_name); 1285 reply(530, "Permission denied.\n"); 1286 pw = NULL; 1287 return; 1288 } 1289 if (!auth_timeok(lc, time(NULL))) { 1290 reply(530, "Login not available right now.\n"); 1291 pw = NULL; 1292 return; 1293 } 1294 } 1295 setusercontext(lc, pw, (uid_t)0, 1296 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1297 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1298#else 1299 setlogin(pw->pw_name); 1300 (void) initgroups(pw->pw_name, pw->pw_gid); 1301#endif 1302 1303#ifdef USE_PAM 1304 if (pamh) { 1305 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1306 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1307 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1308 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1309 } 1310 } 1311#endif 1312 1313 /* open wtmp before chroot */ 1314 ftpd_logwtmp(ttyline, pw->pw_name, remotehost); 1315 logged_in = 1; 1316 1317 if (guest && stats && statfd < 0) 1318#ifdef VIRTUAL_HOSTING 1319 if ((statfd = open(thishost->statfile, O_WRONLY|O_APPEND)) < 0) 1320#else 1321 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1322#endif 1323 stats = 0; 1324 1325 dochroot = 1326#ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1327 login_getcapbool(lc, "ftp-chroot", 0) || 1328#endif 1329 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1); 1330 if (guest) { 1331 /* 1332 * We MUST do a chdir() after the chroot. Otherwise 1333 * the old current directory will be accessible as "." 1334 * outside the new root! 1335 */ 1336 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 1337 reply(550, "Can't set guest privileges."); 1338 goto bad; 1339 } 1340 } else if (dochroot) { 1341 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 1342 reply(550, "Can't change root."); 1343 goto bad; 1344 } 1345 } else if (chdir(pw->pw_dir) < 0) { 1346 if (chdir("/") < 0) { 1347 reply(530, "User %s: can't change directory to %s.", 1348 pw->pw_name, pw->pw_dir); 1349 goto bad; 1350 } else 1351 lreply(230, "No directory! Logging in with home=/"); 1352 } 1353 if (seteuid((uid_t)pw->pw_uid) < 0) { 1354 reply(550, "Can't set uid."); 1355 goto bad; 1356 } 1357 1358 /* 1359 * Display a login message, if it exists. 1360 * N.B. reply(230,) must follow the message. 1361 */ 1362#ifdef VIRTUAL_HOSTING 1363 if ((fd = fopen(thishost->loginmsg, "r")) != NULL) { 1364#else 1365 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 1366#endif 1367 char *cp, line[LINE_MAX]; 1368 1369 while (fgets(line, sizeof(line), fd) != NULL) { 1370 if ((cp = strchr(line, '\n')) != NULL) 1371 *cp = '\0'; 1372 lreply(230, "%s", line); 1373 } 1374 (void) fflush(stdout); 1375 (void) fclose(fd); 1376 } 1377 if (guest) { 1378 if (ident != NULL) 1379 free(ident); 1380 ident = strdup(passwd); 1381 if (ident == NULL) 1382 fatalerror("Ran out of memory."); 1383 1384 reply(230, "Guest login ok, access restrictions apply."); 1385#ifdef SETPROCTITLE 1386#ifdef VIRTUAL_HOSTING 1387 if (thishost != firsthost) 1388 snprintf(proctitle, sizeof(proctitle), 1389 "%s: anonymous(%s)/%.*s", remotehost, hostname, 1390 (int)(sizeof(proctitle) - sizeof(remotehost) - 1391 sizeof(": anonymous/")), passwd); 1392 else 1393#endif 1394 snprintf(proctitle, sizeof(proctitle), 1395 "%s: anonymous/%.*s", remotehost, 1396 (int)(sizeof(proctitle) - sizeof(remotehost) - 1397 sizeof(": anonymous/")), passwd); 1398 setproctitle("%s", proctitle); 1399#endif /* SETPROCTITLE */ 1400 if (logging) 1401 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1402 remotehost, passwd); 1403 } else { 1404 if (dochroot) 1405 reply(230, "User %s logged in, access restrictions apply.", 1406 pw->pw_name); 1407 else 1408 reply(230, "User %s logged in.", pw->pw_name); 1409 1410#ifdef SETPROCTITLE 1411 snprintf(proctitle, sizeof(proctitle), 1412 "%s: %s", remotehost, pw->pw_name); 1413 setproctitle("%s", proctitle); 1414#endif /* SETPROCTITLE */ 1415 if (logging) 1416 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1417 remotehost, pw->pw_name); 1418 } 1419#ifdef LOGIN_CAP 1420 login_close(lc); 1421#endif 1422 return; 1423bad: 1424 /* Forget all about it... */ 1425#ifdef LOGIN_CAP 1426 login_close(lc); 1427#endif 1428 end_login(); 1429} 1430 1431void 1432retrieve(cmd, name) 1433 char *cmd, *name; 1434{ 1435 FILE *fin, *dout; 1436 struct stat st; 1437 int (*closefunc) __P((FILE *)); 1438 time_t start; 1439 1440 if (cmd == 0) { 1441 fin = fopen(name, "r"), closefunc = fclose; 1442 st.st_size = 0; 1443 } else { 1444 char line[BUFSIZ]; 1445 1446 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1447 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1448 st.st_size = -1; 1449 st.st_blksize = BUFSIZ; 1450 } 1451 if (fin == NULL) { 1452 if (errno != 0) { 1453 perror_reply(550, name); 1454 if (cmd == 0) { 1455 LOGCMD("get", name); 1456 } 1457 } 1458 return; 1459 } 1460 byte_count = -1; 1461 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1462 reply(550, "%s: not a plain file.", name); 1463 goto done; 1464 } 1465 if (restart_point) { 1466 if (type == TYPE_A) { 1467 off_t i, n; 1468 int c; 1469 1470 n = restart_point; 1471 i = 0; 1472 while (i++ < n) { 1473 if ((c=getc(fin)) == EOF) { 1474 perror_reply(550, name); 1475 goto done; 1476 } 1477 if (c == '\n') 1478 i++; 1479 } 1480 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1481 perror_reply(550, name); 1482 goto done; 1483 } 1484 } 1485 dout = dataconn(name, st.st_size, "w"); 1486 if (dout == NULL) 1487 goto done; 1488 time(&start); 1489 send_data(fin, dout, st.st_blksize, st.st_size, 1490 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1491 if (cmd == 0 && guest && stats) 1492 logxfer(name, st.st_size, start); 1493 (void) fclose(dout); 1494 data = -1; 1495 pdata = -1; 1496done: 1497 if (cmd == 0) 1498 LOGBYTES("get", name, byte_count); 1499 (*closefunc)(fin); 1500} 1501 1502void 1503store(name, mode, unique) 1504 char *name, *mode; 1505 int unique; 1506{ 1507 FILE *fout, *din; 1508 struct stat st; 1509 int (*closefunc) __P((FILE *)); 1510 1511 if ((unique || guest) && stat(name, &st) == 0 && 1512 (name = gunique(name)) == NULL) { 1513 LOGCMD(*mode == 'w' ? "put" : "append", name); 1514 return; 1515 } 1516 1517 if (restart_point) 1518 mode = "r+"; 1519 fout = fopen(name, mode); 1520 closefunc = fclose; 1521 if (fout == NULL) { 1522 perror_reply(553, name); 1523 LOGCMD(*mode == 'w' ? "put" : "append", name); 1524 return; 1525 } 1526 byte_count = -1; 1527 if (restart_point) { 1528 if (type == TYPE_A) { 1529 off_t i, n; 1530 int c; 1531 1532 n = restart_point; 1533 i = 0; 1534 while (i++ < n) { 1535 if ((c=getc(fout)) == EOF) { 1536 perror_reply(550, name); 1537 goto done; 1538 } 1539 if (c == '\n') 1540 i++; 1541 } 1542 /* 1543 * We must do this seek to "current" position 1544 * because we are changing from reading to 1545 * writing. 1546 */ 1547 if (fseek(fout, 0L, L_INCR) < 0) { 1548 perror_reply(550, name); 1549 goto done; 1550 } 1551 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1552 perror_reply(550, name); 1553 goto done; 1554 } 1555 } 1556 din = dataconn(name, (off_t)-1, "r"); 1557 if (din == NULL) 1558 goto done; 1559 if (receive_data(din, fout) == 0) { 1560 if (unique) 1561 reply(226, "Transfer complete (unique file name:%s).", 1562 name); 1563 else 1564 reply(226, "Transfer complete."); 1565 } 1566 (void) fclose(din); 1567 data = -1; 1568 pdata = -1; 1569done: 1570 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1571 (*closefunc)(fout); 1572} 1573 1574static FILE * 1575getdatasock(mode) 1576 char *mode; 1577{ 1578 int on = 1, s, t, tries; 1579 1580 if (data >= 0) 1581 return (fdopen(data, mode)); 1582 (void) seteuid((uid_t)0); 1583 1584 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1585 if (s < 0) 1586 goto bad; 1587 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1588 (char *) &on, sizeof(on)) < 0) 1589 goto bad; 1590 /* anchor socket to avoid multi-homing problems */ 1591 data_source = ctrl_addr; 1592 data_source.su_port = htons(20); /* ftp-data port */ 1593 for (tries = 1; ; tries++) { 1594 if (bind(s, (struct sockaddr *)&data_source, 1595 data_source.su_len) >= 0) 1596 break; 1597 if (errno != EADDRINUSE || tries > 10) 1598 goto bad; 1599 sleep(tries); 1600 } 1601 (void) seteuid((uid_t)pw->pw_uid); 1602#ifdef IP_TOS 1603 if (data_source.su_family == AF_INET) 1604 { 1605 on = IPTOS_THROUGHPUT; 1606 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 1607 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1608 } 1609#endif 1610#ifdef TCP_NOPUSH 1611 /* 1612 * Turn off push flag to keep sender TCP from sending short packets 1613 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1614 * to set the send buffer size as well, but that may not be desirable 1615 * in heavy-load situations. 1616 */ 1617 on = 1; 1618 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof on) < 0) 1619 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1620#endif 1621#ifdef SO_SNDBUF 1622 on = 65536; 1623 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof on) < 0) 1624 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1625#endif 1626 1627 return (fdopen(s, mode)); 1628bad: 1629 /* Return the real value of errno (close may change it) */ 1630 t = errno; 1631 (void) seteuid((uid_t)pw->pw_uid); 1632 (void) close(s); 1633 errno = t; 1634 return (NULL); 1635} 1636 1637static FILE * 1638dataconn(name, size, mode) 1639 char *name; 1640 off_t size; 1641 char *mode; 1642{ 1643 char sizebuf[32]; 1644 FILE *file; 1645 int retry = 0, tos; 1646 1647 file_size = size; 1648 byte_count = 0; 1649 if (size != (off_t) -1) 1650 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size); 1651 else 1652 *sizebuf = '\0'; 1653 if (pdata >= 0) { 1654 union sockunion from; 1655 int s, fromlen = ctrl_addr.su_len; 1656 struct timeval timeout; 1657 fd_set set; 1658 1659 FD_ZERO(&set); 1660 FD_SET(pdata, &set); 1661 1662 timeout.tv_usec = 0; 1663 timeout.tv_sec = 120; 1664 1665 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) == 0 || 1666 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) { 1667 reply(425, "Can't open data connection."); 1668 (void) close(pdata); 1669 pdata = -1; 1670 return (NULL); 1671 } 1672 (void) close(pdata); 1673 pdata = s; 1674#ifdef IP_TOS 1675 if (from.su_family == AF_INET) 1676 { 1677 tos = IPTOS_THROUGHPUT; 1678 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1679 sizeof(int)); 1680 } 1681#endif 1682 reply(150, "Opening %s mode data connection for '%s'%s.", 1683 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1684 return (fdopen(pdata, mode)); 1685 } 1686 if (data >= 0) { 1687 reply(125, "Using existing data connection for '%s'%s.", 1688 name, sizebuf); 1689 usedefault = 1; 1690 return (fdopen(data, mode)); 1691 } 1692 if (usedefault) 1693 data_dest = his_addr; 1694 usedefault = 1; 1695 file = getdatasock(mode); 1696 if (file == NULL) { 1697 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1698 getnameinfo((struct sockaddr *)&data_source, 1699 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1700 portbuf, sizeof(portbuf), 1701 NI_NUMERICHOST|NI_NUMERICSERV|NI_WITHSCOPEID); 1702 reply(425, "Can't create data socket (%s,%s): %s.", 1703 hostbuf, portbuf, strerror(errno)); 1704 return (NULL); 1705 } 1706 data = fileno(file); 1707 while (connect(data, (struct sockaddr *)&data_dest, 1708 data_dest.su_len) < 0) { 1709 if (errno == EADDRINUSE && retry < swaitmax) { 1710 sleep((unsigned) swaitint); 1711 retry += swaitint; 1712 continue; 1713 } 1714 perror_reply(425, "Can't build data connection"); 1715 (void) fclose(file); 1716 data = -1; 1717 return (NULL); 1718 } 1719 reply(150, "Opening %s mode data connection for '%s'%s.", 1720 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1721 return (file); 1722} 1723 1724/* 1725 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1726 * encapsulation of the data subject to Mode, Structure, and Type. 1727 * 1728 * NB: Form isn't handled. 1729 */ 1730static void 1731send_data(instr, outstr, blksize, filesize, isreg) 1732 FILE *instr, *outstr; 1733 off_t blksize; 1734 off_t filesize; 1735 int isreg; 1736{ 1737 int c, filefd, netfd; 1738 char *buf; 1739 size_t len; 1740 off_t cnt; 1741 1742 transflag++; 1743 if (setjmp(urgcatch)) { 1744 transflag = 0; 1745 return; 1746 } 1747 switch (type) { 1748 1749 case TYPE_A: 1750 while ((c = getc(instr)) != EOF) { 1751 byte_count++; 1752 if (c == '\n') { 1753 if (ferror(outstr)) 1754 goto data_err; 1755 (void) putc('\r', outstr); 1756 } 1757 (void) putc(c, outstr); 1758 } 1759 fflush(outstr); 1760 transflag = 0; 1761 if (ferror(instr)) 1762 goto file_err; 1763 if (ferror(outstr)) 1764 goto data_err; 1765 reply(226, "Transfer complete."); 1766 return; 1767 1768 case TYPE_I: 1769 case TYPE_L: 1770 /* 1771 * isreg is only set if we are not doing restart and we 1772 * are sending a regular file 1773 */ 1774 netfd = fileno(outstr); 1775 filefd = fileno(instr); 1776 1777 if (isreg) { 1778 1779 off_t offset; 1780 int err; 1781 1782 len = filesize; 1783 err = cnt = offset = 0; 1784 1785 while (err != -1 && cnt < filesize) { 1786 err = sendfile(filefd, netfd, offset, len, 1787 (struct sf_hdtr *) NULL, &cnt, 0); 1788 byte_count += cnt; 1789 offset += cnt; 1790 len -= cnt; 1791 1792 if (err == -1) { 1793 if (!cnt) 1794 goto oldway; 1795 1796 goto data_err; 1797 } 1798 } 1799 1800 reply(226, "Transfer complete."); 1801 return; 1802 } 1803 1804oldway: 1805 if ((buf = malloc((u_int)blksize)) == NULL) { 1806 transflag = 0; 1807 perror_reply(451, "Local resource failure: malloc"); 1808 return; 1809 } 1810 1811 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1812 write(netfd, buf, cnt) == cnt) 1813 byte_count += cnt; 1814 transflag = 0; 1815 (void)free(buf); 1816 if (cnt != 0) { 1817 if (cnt < 0) 1818 goto file_err; 1819 goto data_err; 1820 } 1821 reply(226, "Transfer complete."); 1822 return; 1823 default: 1824 transflag = 0; 1825 reply(550, "Unimplemented TYPE %d in send_data", type); 1826 return; 1827 } 1828 1829data_err: 1830 transflag = 0; 1831 perror_reply(426, "Data connection"); 1832 return; 1833 1834file_err: 1835 transflag = 0; 1836 perror_reply(551, "Error on input file"); 1837} 1838 1839/* 1840 * Transfer data from peer to "outstr" using the appropriate encapulation of 1841 * the data subject to Mode, Structure, and Type. 1842 * 1843 * N.B.: Form isn't handled. 1844 */ 1845static int 1846receive_data(instr, outstr) 1847 FILE *instr, *outstr; 1848{ 1849 int c; 1850 int cnt, bare_lfs; 1851 char buf[BUFSIZ]; 1852 1853 transflag++; 1854 if (setjmp(urgcatch)) { 1855 transflag = 0; 1856 return (-1); 1857 } 1858 1859 bare_lfs = 0; 1860 1861 switch (type) { 1862 1863 case TYPE_I: 1864 case TYPE_L: 1865 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1866 if (write(fileno(outstr), buf, cnt) != cnt) 1867 goto file_err; 1868 byte_count += cnt; 1869 } 1870 if (cnt < 0) 1871 goto data_err; 1872 transflag = 0; 1873 return (0); 1874 1875 case TYPE_E: 1876 reply(553, "TYPE E not implemented."); 1877 transflag = 0; 1878 return (-1); 1879 1880 case TYPE_A: 1881 while ((c = getc(instr)) != EOF) { 1882 byte_count++; 1883 if (c == '\n') 1884 bare_lfs++; 1885 while (c == '\r') { 1886 if (ferror(outstr)) 1887 goto data_err; 1888 if ((c = getc(instr)) != '\n') { 1889 (void) putc ('\r', outstr); 1890 if (c == '\0' || c == EOF) 1891 goto contin2; 1892 } 1893 } 1894 (void) putc(c, outstr); 1895 contin2: ; 1896 } 1897 fflush(outstr); 1898 if (ferror(instr)) 1899 goto data_err; 1900 if (ferror(outstr)) 1901 goto file_err; 1902 transflag = 0; 1903 if (bare_lfs) { 1904 lreply(226, 1905 "WARNING! %d bare linefeeds received in ASCII mode", 1906 bare_lfs); 1907 (void)printf(" File may not have transferred correctly.\r\n"); 1908 } 1909 return (0); 1910 default: 1911 reply(550, "Unimplemented TYPE %d in receive_data", type); 1912 transflag = 0; 1913 return (-1); 1914 } 1915 1916data_err: 1917 transflag = 0; 1918 perror_reply(426, "Data Connection"); 1919 return (-1); 1920 1921file_err: 1922 transflag = 0; 1923 perror_reply(452, "Error writing file"); 1924 return (-1); 1925} 1926 1927void 1928statfilecmd(filename) 1929 char *filename; 1930{ 1931 FILE *fin; 1932 int c; 1933 char line[LINE_MAX]; 1934 1935 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 1936 fin = ftpd_popen(line, "r"); 1937 lreply(211, "status of %s:", filename); 1938 while ((c = getc(fin)) != EOF) { 1939 if (c == '\n') { 1940 if (ferror(stdout)){ 1941 perror_reply(421, "control connection"); 1942 (void) ftpd_pclose(fin); 1943 dologout(1); 1944 /* NOTREACHED */ 1945 } 1946 if (ferror(fin)) { 1947 perror_reply(551, filename); 1948 (void) ftpd_pclose(fin); 1949 return; 1950 } 1951 (void) putc('\r', stdout); 1952 } 1953 (void) putc(c, stdout); 1954 } 1955 (void) ftpd_pclose(fin); 1956 reply(211, "End of Status"); 1957} 1958 1959void 1960statcmd() 1961{ 1962 union sockunion *su; 1963 u_char *a, *p; 1964 char hname[INET6_ADDRSTRLEN]; 1965 int ispassive; 1966 1967 lreply(211, "%s FTP server status:", hostname, version); 1968 printf(" %s\r\n", version); 1969 printf(" Connected to %s", remotehost); 1970 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1971 hname, sizeof(hname) - 1, NULL, 0, 1972 NI_NUMERICHOST|NI_WITHSCOPEID)) { 1973 if (strcmp(hname, remotehost) != 0) 1974 printf(" (%s)", hname); 1975 } 1976 printf("\r\n"); 1977 if (logged_in) { 1978 if (guest) 1979 printf(" Logged in anonymously\r\n"); 1980 else 1981 printf(" Logged in as %s\r\n", pw->pw_name); 1982 } else if (askpasswd) 1983 printf(" Waiting for password\r\n"); 1984 else 1985 printf(" Waiting for user name\r\n"); 1986 printf(" TYPE: %s", typenames[type]); 1987 if (type == TYPE_A || type == TYPE_E) 1988 printf(", FORM: %s", formnames[form]); 1989 if (type == TYPE_L) 1990#if NBBY == 8 1991 printf(" %d", NBBY); 1992#else 1993 printf(" %d", bytesize); /* need definition! */ 1994#endif 1995 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1996 strunames[stru], modenames[mode]); 1997 if (data != -1) 1998 printf(" Data connection open\r\n"); 1999 else if (pdata != -1) { 2000 ispassive = 1; 2001 su = &pasv_addr; 2002 goto printaddr; 2003 } else if (usedefault == 0) { 2004 ispassive = 0; 2005 su = &data_dest; 2006printaddr: 2007#define UC(b) (((int) b) & 0xff) 2008 if (epsvall) { 2009 printf(" EPSV only mode (EPSV ALL)\r\n"); 2010 goto epsvonly; 2011 } 2012 2013 /* PORT/PASV */ 2014 if (su->su_family == AF_INET) { 2015 a = (u_char *) &su->su_sin.sin_addr; 2016 p = (u_char *) &su->su_sin.sin_port; 2017 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2018 ispassive ? "PASV" : "PORT", 2019 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2020 UC(p[0]), UC(p[1])); 2021 } 2022 2023 /* LPRT/LPSV */ 2024 { 2025 int alen, af, i; 2026 2027 switch (su->su_family) { 2028 case AF_INET: 2029 a = (u_char *) &su->su_sin.sin_addr; 2030 p = (u_char *) &su->su_sin.sin_port; 2031 alen = sizeof(su->su_sin.sin_addr); 2032 af = 4; 2033 break; 2034 case AF_INET6: 2035 a = (u_char *) &su->su_sin6.sin6_addr; 2036 p = (u_char *) &su->su_sin6.sin6_port; 2037 alen = sizeof(su->su_sin6.sin6_addr); 2038 af = 6; 2039 break; 2040 default: 2041 af = 0; 2042 break; 2043 } 2044 if (af) { 2045 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2046 af, alen); 2047 for (i = 0; i < alen; i++) 2048 printf("%d,", UC(a[i])); 2049 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2050 } 2051 } 2052 2053epsvonly:; 2054 /* EPRT/EPSV */ 2055 { 2056 int af; 2057 2058 switch (su->su_family) { 2059 case AF_INET: 2060 af = 1; 2061 break; 2062 case AF_INET6: 2063 af = 2; 2064 break; 2065 default: 2066 af = 0; 2067 break; 2068 } 2069 if (af) { 2070 if (!getnameinfo((struct sockaddr *)su, su->su_len, 2071 hname, sizeof(hname) - 1, NULL, 0, 2072 NI_NUMERICHOST)) { 2073 printf(" %s |%d|%s|%d|\r\n", 2074 ispassive ? "EPSV" : "EPRT", 2075 af, hname, htons(su->su_port)); 2076 } 2077 } 2078 } 2079#undef UC 2080 } else 2081 printf(" No data connection\r\n"); 2082 reply(211, "End of status"); 2083} 2084 2085void 2086fatalerror(s) 2087 char *s; 2088{ 2089 2090 reply(451, "Error in server: %s\n", s); 2091 reply(221, "Closing connection due to server error."); 2092 dologout(0); 2093 /* NOTREACHED */ 2094} 2095 2096void 2097#if __STDC__ 2098reply(int n, const char *fmt, ...) 2099#else 2100reply(n, fmt, va_alist) 2101 int n; 2102 char *fmt; 2103 va_dcl 2104#endif 2105{ 2106 va_list ap; 2107#if __STDC__ 2108 va_start(ap, fmt); 2109#else 2110 va_start(ap); 2111#endif 2112 (void)printf("%d ", n); 2113 (void)vprintf(fmt, ap); 2114 (void)printf("\r\n"); 2115 (void)fflush(stdout); 2116 if (ftpdebug) { 2117 syslog(LOG_DEBUG, "<--- %d ", n); 2118 vsyslog(LOG_DEBUG, fmt, ap); 2119 } 2120} 2121 2122void 2123#if __STDC__ 2124lreply(int n, const char *fmt, ...) 2125#else 2126lreply(n, fmt, va_alist) 2127 int n; 2128 char *fmt; 2129 va_dcl 2130#endif 2131{ 2132 va_list ap; 2133#if __STDC__ 2134 va_start(ap, fmt); 2135#else 2136 va_start(ap); 2137#endif 2138 (void)printf("%d- ", n); 2139 (void)vprintf(fmt, ap); 2140 (void)printf("\r\n"); 2141 (void)fflush(stdout); 2142 if (ftpdebug) { 2143 syslog(LOG_DEBUG, "<--- %d- ", n); 2144 vsyslog(LOG_DEBUG, fmt, ap); 2145 } 2146} 2147 2148static void 2149ack(s) 2150 char *s; 2151{ 2152 2153 reply(250, "%s command successful.", s); 2154} 2155 2156void 2157nack(s) 2158 char *s; 2159{ 2160 2161 reply(502, "%s command not implemented.", s); 2162} 2163 2164/* ARGSUSED */ 2165void 2166yyerror(s) 2167 char *s; 2168{ 2169 char *cp; 2170 2171 if ((cp = strchr(cbuf,'\n'))) 2172 *cp = '\0'; 2173 reply(500, "'%s': command not understood.", cbuf); 2174} 2175 2176void 2177delete(name) 2178 char *name; 2179{ 2180 struct stat st; 2181 2182 LOGCMD("delete", name); 2183 if (stat(name, &st) < 0) { 2184 perror_reply(550, name); 2185 return; 2186 } 2187 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2188 if (rmdir(name) < 0) { 2189 perror_reply(550, name); 2190 return; 2191 } 2192 goto done; 2193 } 2194 if (unlink(name) < 0) { 2195 perror_reply(550, name); 2196 return; 2197 } 2198done: 2199 ack("DELE"); 2200} 2201 2202void 2203cwd(path) 2204 char *path; 2205{ 2206 2207 if (chdir(path) < 0) 2208 perror_reply(550, path); 2209 else 2210 ack("CWD"); 2211} 2212 2213void 2214makedir(name) 2215 char *name; 2216{ 2217 2218 LOGCMD("mkdir", name); 2219 if (mkdir(name, 0777) < 0) 2220 perror_reply(550, name); 2221 else 2222 reply(257, "MKD command successful."); 2223} 2224 2225void 2226removedir(name) 2227 char *name; 2228{ 2229 2230 LOGCMD("rmdir", name); 2231 if (rmdir(name) < 0) 2232 perror_reply(550, name); 2233 else 2234 ack("RMD"); 2235} 2236 2237void 2238pwd() 2239{ 2240 char path[MAXPATHLEN + 1]; 2241 2242 if (getwd(path) == (char *)NULL) 2243 reply(550, "%s.", path); 2244 else 2245 reply(257, "\"%s\" is current directory.", path); 2246} 2247 2248char * 2249renamefrom(name) 2250 char *name; 2251{ 2252 struct stat st; 2253 2254 if (stat(name, &st) < 0) { 2255 perror_reply(550, name); 2256 return ((char *)0); 2257 } 2258 reply(350, "File exists, ready for destination name"); 2259 return (name); 2260} 2261 2262void 2263renamecmd(from, to) 2264 char *from, *to; 2265{ 2266 struct stat st; 2267 2268 LOGCMD2("rename", from, to); 2269 2270 if (guest && (stat(to, &st) == 0)) { 2271 reply(550, "%s: permission denied", to); 2272 return; 2273 } 2274 2275 if (rename(from, to) < 0) 2276 perror_reply(550, "rename"); 2277 else 2278 ack("RNTO"); 2279} 2280 2281static void 2282dolog(who) 2283 struct sockaddr *who; 2284{ 2285 int error; 2286 2287 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2288 2289#ifdef SETPROCTITLE 2290#ifdef VIRTUAL_HOSTING 2291 if (thishost != firsthost) 2292 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2293 remotehost, hostname); 2294 else 2295#endif 2296 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2297 remotehost); 2298 setproctitle("%s", proctitle); 2299#endif /* SETPROCTITLE */ 2300 2301 if (logging) { 2302#ifdef VIRTUAL_HOSTING 2303 if (thishost != firsthost) 2304 syslog(LOG_INFO, "connection from %s (to %s)", 2305 remotehost, hostname); 2306 else 2307#endif 2308 { 2309 char who_name[MAXHOSTNAMELEN]; 2310 2311 error = getnameinfo(who, who->sa_len, 2312 who_name, sizeof(who_name) - 1, 2313 NULL, 0, 2314 NI_NUMERICHOST|NI_WITHSCOPEID); 2315 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2316 error == 0 ? who_name : ""); 2317 } 2318 } 2319} 2320 2321/* 2322 * Record logout in wtmp file 2323 * and exit with supplied status. 2324 */ 2325void 2326dologout(status) 2327 int status; 2328{ 2329 /* 2330 * Prevent reception of SIGURG from resulting in a resumption 2331 * back to the main program loop. 2332 */ 2333 transflag = 0; 2334 2335 if (logged_in) { 2336 (void) seteuid((uid_t)0); 2337 ftpd_logwtmp(ttyline, "", ""); 2338 } 2339 /* beware of flushing buffers after a SIGPIPE */ 2340 _exit(status); 2341} 2342 2343static void 2344myoob(signo) 2345 int signo; 2346{ 2347 char *cp; 2348 2349 /* only process if transfer occurring */ 2350 if (!transflag) 2351 return; 2352 cp = tmpline; 2353 if (getline(cp, 7, stdin) == NULL) { 2354 reply(221, "You could at least say goodbye."); 2355 dologout(0); 2356 } 2357 upper(cp); 2358 if (strcmp(cp, "ABOR\r\n") == 0) { 2359 tmpline[0] = '\0'; 2360 reply(426, "Transfer aborted. Data connection closed."); 2361 reply(226, "Abort successful"); 2362 longjmp(urgcatch, 1); 2363 } 2364 if (strcmp(cp, "STAT\r\n") == 0) { 2365 tmpline[0] = '\0'; 2366 if (file_size != (off_t) -1) 2367 reply(213, "Status: %qd of %qd bytes transferred", 2368 byte_count, file_size); 2369 else 2370 reply(213, "Status: %qd bytes transferred", byte_count); 2371 } 2372} 2373 2374/* 2375 * Note: a response of 425 is not mentioned as a possible response to 2376 * the PASV command in RFC959. However, it has been blessed as 2377 * a legitimate response by Jon Postel in a telephone conversation 2378 * with Rick Adams on 25 Jan 89. 2379 */ 2380void 2381passive() 2382{ 2383 int len; 2384 char *p, *a; 2385 2386 if (pdata >= 0) /* close old port if one set */ 2387 close(pdata); 2388 2389 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2390 if (pdata < 0) { 2391 perror_reply(425, "Can't open passive connection"); 2392 return; 2393 } 2394 2395 (void) seteuid((uid_t)0); 2396 2397#ifdef IP_PORTRANGE 2398 if (ctrl_addr.su_family == AF_INET) { 2399 int on = restricted_data_ports ? IP_PORTRANGE_HIGH 2400 : IP_PORTRANGE_DEFAULT; 2401 2402 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2403 (char *)&on, sizeof(on)) < 0) 2404 goto pasv_error; 2405 } 2406#endif 2407#ifdef IPV6_PORTRANGE 2408 if (ctrl_addr.su_family == AF_INET6) { 2409 int on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2410 : IPV6_PORTRANGE_DEFAULT; 2411 2412 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2413 (char *)&on, sizeof(on)) < 0) 2414 goto pasv_error; 2415 } 2416#endif 2417 2418 pasv_addr = ctrl_addr; 2419 pasv_addr.su_port = 0; 2420 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2421 goto pasv_error; 2422 2423 (void) seteuid((uid_t)pw->pw_uid); 2424 2425 len = sizeof(pasv_addr); 2426 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2427 goto pasv_error; 2428 if (listen(pdata, 1) < 0) 2429 goto pasv_error; 2430 if (pasv_addr.su_family == AF_INET) 2431 a = (char *) &pasv_addr.su_sin.sin_addr; 2432 else if (pasv_addr.su_family == AF_INET6 && 2433 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2434 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2435 else 2436 goto pasv_error; 2437 2438 p = (char *) &pasv_addr.su_port; 2439 2440#define UC(b) (((int) b) & 0xff) 2441 2442 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2443 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2444 return; 2445 2446pasv_error: 2447 (void) seteuid((uid_t)pw->pw_uid); 2448 (void) close(pdata); 2449 pdata = -1; 2450 perror_reply(425, "Can't open passive connection"); 2451 return; 2452} 2453 2454/* 2455 * Long Passive defined in RFC 1639. 2456 * 228 Entering Long Passive Mode 2457 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2458 */ 2459 2460void 2461long_passive(cmd, pf) 2462 char *cmd; 2463 int pf; 2464{ 2465 int len; 2466 char *p, *a; 2467 2468 if (pdata >= 0) /* close old port if one set */ 2469 close(pdata); 2470 2471 if (pf != PF_UNSPEC) { 2472 if (ctrl_addr.su_family != pf) { 2473 switch (ctrl_addr.su_family) { 2474 case AF_INET: 2475 pf = 1; 2476 break; 2477 case AF_INET6: 2478 pf = 2; 2479 break; 2480 default: 2481 pf = 0; 2482 break; 2483 } 2484 /* 2485 * XXX 2486 * only EPRT/EPSV ready clients will understand this 2487 */ 2488 if (strcmp(cmd, "EPSV") == 0 && pf) { 2489 reply(522, "Network protocol mismatch, " 2490 "use (%d)", pf); 2491 } else 2492 reply(501, "Network protocol mismatch"); /*XXX*/ 2493 2494 return; 2495 } 2496 } 2497 2498 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2499 if (pdata < 0) { 2500 perror_reply(425, "Can't open passive connection"); 2501 return; 2502 } 2503 2504 (void) seteuid((uid_t)0); 2505 2506 pasv_addr = ctrl_addr; 2507 pasv_addr.su_port = 0; 2508 len = pasv_addr.su_len; 2509 2510#ifdef IP_PORTRANGE 2511 if (ctrl_addr.su_family == AF_INET) { 2512 int on = restricted_data_ports ? IP_PORTRANGE_HIGH 2513 : IP_PORTRANGE_DEFAULT; 2514 2515 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2516 (char *)&on, sizeof(on)) < 0) 2517 goto pasv_error; 2518 } 2519#endif 2520#ifdef IPV6_PORTRANGE 2521 if (ctrl_addr.su_family == AF_INET6) { 2522 int on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2523 : IPV6_PORTRANGE_DEFAULT; 2524 2525 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2526 (char *)&on, sizeof(on)) < 0) 2527 goto pasv_error; 2528 } 2529#endif 2530 2531 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2532 goto pasv_error; 2533 2534 (void) seteuid((uid_t)pw->pw_uid); 2535 2536 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2537 goto pasv_error; 2538 if (listen(pdata, 1) < 0) 2539 goto pasv_error; 2540 2541#define UC(b) (((int) b) & 0xff) 2542 2543 if (strcmp(cmd, "LPSV") == 0) { 2544 p = (char *)&pasv_addr.su_port; 2545 switch (pasv_addr.su_family) { 2546 case AF_INET: 2547 a = (char *) &pasv_addr.su_sin.sin_addr; 2548 v4_reply: 2549 reply(228, 2550"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2551 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2552 2, UC(p[0]), UC(p[1])); 2553 return; 2554 case AF_INET6: 2555 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2556 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2557 goto v4_reply; 2558 } 2559 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2560 reply(228, 2561"Entering Long Passive Mode " 2562"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2563 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2564 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2565 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2566 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2567 2, UC(p[0]), UC(p[1])); 2568 return; 2569 } 2570 } else if (strcmp(cmd, "EPSV") == 0) { 2571 switch (pasv_addr.su_family) { 2572 case AF_INET: 2573 case AF_INET6: 2574 reply(229, "Entering Extended Passive Mode (|||%d|)", 2575 ntohs(pasv_addr.su_port)); 2576 return; 2577 } 2578 } else { 2579 /* more proper error code? */ 2580 } 2581 2582pasv_error: 2583 (void) seteuid((uid_t)pw->pw_uid); 2584 (void) close(pdata); 2585 pdata = -1; 2586 perror_reply(425, "Can't open passive connection"); 2587 return; 2588} 2589 2590/* 2591 * Generate unique name for file with basename "local". 2592 * The file named "local" is already known to exist. 2593 * Generates failure reply on error. 2594 */ 2595static char * 2596gunique(local) 2597 char *local; 2598{ 2599 static char new[MAXPATHLEN]; 2600 struct stat st; 2601 int count; 2602 char *cp; 2603 2604 cp = strrchr(local, '/'); 2605 if (cp) 2606 *cp = '\0'; 2607 if (stat(cp ? local : ".", &st) < 0) { 2608 perror_reply(553, cp ? local : "."); 2609 return ((char *) 0); 2610 } 2611 if (cp) 2612 *cp = '/'; 2613 /* -4 is for the .nn<null> we put on the end below */ 2614 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2615 cp = new + strlen(new); 2616 *cp++ = '.'; 2617 for (count = 1; count < 100; count++) { 2618 (void)sprintf(cp, "%d", count); 2619 if (stat(new, &st) < 0) 2620 return (new); 2621 } 2622 reply(452, "Unique file name cannot be created."); 2623 return (NULL); 2624} 2625 2626/* 2627 * Format and send reply containing system error number. 2628 */ 2629void 2630perror_reply(code, string) 2631 int code; 2632 char *string; 2633{ 2634 2635 reply(code, "%s: %s.", string, strerror(errno)); 2636} 2637 2638static char *onefile[] = { 2639 "", 2640 0 2641}; 2642 2643void 2644send_file_list(whichf) 2645 char *whichf; 2646{ 2647 struct stat st; 2648 DIR *dirp = NULL; 2649 struct dirent *dir; 2650 FILE *dout = NULL; 2651 char **dirlist, *dirname; 2652 int simple = 0; 2653 int freeglob = 0; 2654 glob_t gl; 2655 2656 if (strpbrk(whichf, "~{[*?") != NULL) { 2657 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 2658 2659 memset(&gl, 0, sizeof(gl)); 2660 gl.gl_matchc = MAXGLOBARGS; 2661 flags |= GLOB_LIMIT; 2662 freeglob = 1; 2663 if (glob(whichf, flags, 0, &gl)) { 2664 reply(550, "not found"); 2665 goto out; 2666 } else if (gl.gl_pathc == 0) { 2667 errno = ENOENT; 2668 perror_reply(550, whichf); 2669 goto out; 2670 } 2671 dirlist = gl.gl_pathv; 2672 } else { 2673 onefile[0] = whichf; 2674 dirlist = onefile; 2675 simple = 1; 2676 } 2677 2678 if (setjmp(urgcatch)) { 2679 transflag = 0; 2680 goto out; 2681 } 2682 while ((dirname = *dirlist++)) { 2683 if (stat(dirname, &st) < 0) { 2684 /* 2685 * If user typed "ls -l", etc, and the client 2686 * used NLST, do what the user meant. 2687 */ 2688 if (dirname[0] == '-' && *dirlist == NULL && 2689 transflag == 0) { 2690 retrieve(_PATH_LS " %s", dirname); 2691 goto out; 2692 } 2693 perror_reply(550, whichf); 2694 if (dout != NULL) { 2695 (void) fclose(dout); 2696 transflag = 0; 2697 data = -1; 2698 pdata = -1; 2699 } 2700 goto out; 2701 } 2702 2703 if (S_ISREG(st.st_mode)) { 2704 if (dout == NULL) { 2705 dout = dataconn("file list", (off_t)-1, "w"); 2706 if (dout == NULL) 2707 goto out; 2708 transflag++; 2709 } 2710 fprintf(dout, "%s%s\n", dirname, 2711 type == TYPE_A ? "\r" : ""); 2712 byte_count += strlen(dirname) + 1; 2713 continue; 2714 } else if (!S_ISDIR(st.st_mode)) 2715 continue; 2716 2717 if ((dirp = opendir(dirname)) == NULL) 2718 continue; 2719 2720 while ((dir = readdir(dirp)) != NULL) { 2721 char nbuf[MAXPATHLEN]; 2722 2723 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2724 continue; 2725 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2726 dir->d_namlen == 2) 2727 continue; 2728 2729 snprintf(nbuf, sizeof(nbuf), 2730 "%s/%s", dirname, dir->d_name); 2731 2732 /* 2733 * We have to do a stat to insure it's 2734 * not a directory or special file. 2735 */ 2736 if (simple || (stat(nbuf, &st) == 0 && 2737 S_ISREG(st.st_mode))) { 2738 if (dout == NULL) { 2739 dout = dataconn("file list", (off_t)-1, 2740 "w"); 2741 if (dout == NULL) 2742 goto out; 2743 transflag++; 2744 } 2745 if (nbuf[0] == '.' && nbuf[1] == '/') 2746 fprintf(dout, "%s%s\n", &nbuf[2], 2747 type == TYPE_A ? "\r" : ""); 2748 else 2749 fprintf(dout, "%s%s\n", nbuf, 2750 type == TYPE_A ? "\r" : ""); 2751 byte_count += strlen(nbuf) + 1; 2752 } 2753 } 2754 (void) closedir(dirp); 2755 } 2756 2757 if (dout == NULL) 2758 reply(550, "No files found."); 2759 else if (ferror(dout) != 0) 2760 perror_reply(550, "Data connection"); 2761 else 2762 reply(226, "Transfer complete."); 2763 2764 transflag = 0; 2765 if (dout != NULL) 2766 (void) fclose(dout); 2767 data = -1; 2768 pdata = -1; 2769out: 2770 if (freeglob) { 2771 freeglob = 0; 2772 globfree(&gl); 2773 } 2774} 2775 2776void 2777reapchild(signo) 2778 int signo; 2779{ 2780 while (wait3(NULL, WNOHANG, NULL) > 0); 2781} 2782 2783#ifdef OLD_SETPROCTITLE 2784/* 2785 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 2786 * Warning, since this is usually started from inetd.conf, it often doesn't 2787 * have much of an environment or arglist to overwrite. 2788 */ 2789void 2790#if __STDC__ 2791setproctitle(const char *fmt, ...) 2792#else 2793setproctitle(fmt, va_alist) 2794 char *fmt; 2795 va_dcl 2796#endif 2797{ 2798 int i; 2799 va_list ap; 2800 char *p, *bp, ch; 2801 char buf[LINE_MAX]; 2802 2803#if __STDC__ 2804 va_start(ap, fmt); 2805#else 2806 va_start(ap); 2807#endif 2808 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 2809 2810 /* make ps print our process name */ 2811 p = Argv[0]; 2812 *p++ = '-'; 2813 2814 i = strlen(buf); 2815 if (i > LastArgv - p - 2) { 2816 i = LastArgv - p - 2; 2817 buf[i] = '\0'; 2818 } 2819 bp = buf; 2820 while (ch = *bp++) 2821 if (ch != '\n' && ch != '\r') 2822 *p++ = ch; 2823 while (p < LastArgv) 2824 *p++ = ' '; 2825} 2826#endif /* OLD_SETPROCTITLE */ 2827 2828static void 2829logxfer(name, size, start) 2830 char *name; 2831 long size; 2832 long start; 2833{ 2834 char buf[1024]; 2835 char path[MAXPATHLEN + 1]; 2836 time_t now; 2837 2838 if (statfd >= 0 && getwd(path) != NULL) { 2839 time(&now); 2840 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%ld!%ld\n", 2841 ctime(&now)+4, ident, remotehost, 2842 path, name, size, now - start + (now == start)); 2843 write(statfd, buf, strlen(buf)); 2844 } 2845} 2846