ftpd.c revision 1.210
1/* $OpenBSD: ftpd.c,v 1.210 2015/10/25 23:10:53 millert Exp $ */ 2/* $NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $ */ 3 4/* 5 * Copyright (C) 1997 and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* 34 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 */ 61 62/* 63 * FTP server. 64 */ 65#include <sys/stat.h> 66#include <sys/ioctl.h> 67#include <sys/socket.h> 68#include <sys/wait.h> 69#include <sys/mman.h> 70 71#include <netinet/in.h> 72#include <netinet/ip.h> 73#include <netinet/tcp.h> 74 75#define FTP_NAMES 76#include <arpa/ftp.h> 77#include <arpa/inet.h> 78#include <arpa/telnet.h> 79 80#include <bsd_auth.h> 81#include <ctype.h> 82#include <dirent.h> 83#include <errno.h> 84#include <fcntl.h> 85#include <glob.h> 86#include <limits.h> 87#include <login_cap.h> 88#include <netdb.h> 89#include <pwd.h> 90#include <signal.h> 91#include <stdarg.h> 92#include <stdio.h> 93#include <stdlib.h> 94#include <string.h> 95#include <syslog.h> 96#include <time.h> 97#include <vis.h> 98#include <unistd.h> 99#include <utmp.h> 100#include <poll.h> 101 102#include "pathnames.h" 103#include "monitor.h" 104#include "extern.h" 105 106extern off_t restart_point; 107extern char cbuf[]; 108 109union sockunion ctrl_addr; 110union sockunion data_source; 111union sockunion data_dest; 112union sockunion his_addr; 113union sockunion pasv_addr; 114 115sigset_t allsigs; 116 117int daemon_mode = 0; 118int data; 119int logged_in; 120struct passwd *pw; 121int debug = 0; 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 anon_ok = 1; 126int anon_only = 0; 127unsigned int minuid = 1000; 128int multihome = 0; 129int guest; 130int stats; 131int statfd = -1; 132int portcheck = 1; 133int dochroot; 134int type; 135int form; 136int stru; /* avoid C keyword */ 137int mode; 138int doutmp = 0; /* update utmp file */ 139int nowtmp = 0; /* do not update wtmp file */ 140int usedefault = 1; /* for data transfers */ 141int pdata = -1; /* for passive mode */ 142int family = AF_UNSPEC; 143volatile sig_atomic_t transflag; 144off_t file_size; 145off_t byte_count; 146mode_t defumask = S_IWGRP|S_IWOTH; /* default umask value */ 147int umaskchange = 1; /* allow user to change umask value. */ 148char tmpline[7]; 149char hostname[HOST_NAME_MAX+1]; 150char remotehost[HOST_NAME_MAX+1]; 151char dhostname[HOST_NAME_MAX+1]; 152char *guestpw; 153char ttyline[20]; 154#if 0 155char *tty = ttyline; /* for klogin */ 156#endif 157static struct utmp utmp; /* for utmp */ 158static login_cap_t *lc; 159static auth_session_t *as; 160static volatile sig_atomic_t recvurg; 161 162int epsvall = 0; 163 164/* 165 * Timeout intervals for retrying connections 166 * to hosts that don't accept PORT cmds. This 167 * is a kludge, but given the problems with TCP... 168 */ 169#define SWAITMAX 90 /* wait at most 90 seconds */ 170#define SWAITINT 5 /* interval between retries */ 171 172int swaitmax = SWAITMAX; 173int swaitint = SWAITINT; 174 175#ifdef HASSETPROCTITLE 176char proctitle[BUFSIZ]; /* initial part of title */ 177#endif /* HASSETPROCTITLE */ 178 179#define LOGCMD(cmd, file) \ 180 if (logging > 1) \ 181 syslog(LOG_INFO,"%s %s%s", cmd, \ 182 *(file) == '/' ? "" : curdir(), file); 183#define LOGCMD2(cmd, file1, file2) \ 184 if (logging > 1) \ 185 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 186 *(file1) == '/' ? "" : curdir(), file1, \ 187 *(file2) == '/' ? "" : curdir(), file2); 188#define LOGBYTES(cmd, file, cnt) \ 189 if (logging > 1) { \ 190 if (cnt == (off_t)-1) \ 191 syslog(LOG_INFO,"%s %s%s", cmd, \ 192 *(file) == '/' ? "" : curdir(), file); \ 193 else \ 194 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 195 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 196 } 197 198static void ack(char *); 199static void sigurg(int); 200static void myoob(void); 201static int checkuser(char *, char *); 202static FILE *dataconn(char *, off_t, char *); 203static void dolog(struct sockaddr *); 204static char *copy_dir(char *, struct passwd *); 205static char *curdir(void); 206static void end_login(void); 207static FILE *getdatasock(char *); 208static int guniquefd(char *, char **); 209static void lostconn(int); 210static void sigquit(int); 211static int receive_data(FILE *, FILE *); 212static void replydirname(const char *, const char *); 213static int send_data(FILE *, FILE *, off_t, off_t, int); 214static struct passwd * 215 sgetpwnam(char *, struct passwd *); 216static void reapchild(int); 217static void usage(void); 218 219void logxfer(char *, off_t, time_t); 220void set_slave_signals(void); 221 222static char * 223curdir(void) 224{ 225 static char path[PATH_MAX+1]; /* path + '/' */ 226 227 if (getcwd(path, sizeof(path)-1) == NULL) 228 return (""); 229 if (path[1] != '\0') /* special case for root dir. */ 230 strlcat(path, "/", sizeof path); 231 /* For guest account, skip / since it's chrooted */ 232 return (guest ? path+1 : path); 233} 234 235char *argstr = "AdDhnlm:MSt:T:u:PUvW46"; 236 237static void 238usage(void) 239{ 240 syslog(LOG_ERR, 241 "usage: ftpd [-46ADdlMnPSUW] [-m minuid] [-T maxtimeout] " 242 "[-t timeout] [-u mask]"); 243 exit(2); 244} 245 246int 247main(int argc, char *argv[]) 248{ 249 socklen_t addrlen; 250 int ch, on = 1, tos; 251 char line[LINE_MAX]; 252 FILE *fp; 253 struct hostent *hp; 254 struct sigaction sa; 255 int error = 0; 256 const char *errstr; 257 258 tzset(); /* in case no timezone database in ~ftp */ 259 sigfillset(&allsigs); /* used to block signals while root */ 260 sigemptyset(&sa.sa_mask); 261 sa.sa_flags = SA_RESTART; 262 263 while ((ch = getopt(argc, argv, argstr)) != -1) { 264 switch (ch) { 265 case 'A': 266 anon_only = 1; 267 break; 268 269 case 'd': 270 case 'v': /* deprecated */ 271 debug = 1; 272 break; 273 274 case 'D': 275 daemon_mode = 1; 276 break; 277 278 case 'P': 279 portcheck = 0; 280 break; 281 282 case 'h': /* deprecated */ 283 break; 284 285 case 'l': 286 logging++; /* > 1 == extra logging */ 287 break; 288 289 case 'm': 290 minuid = strtonum(optarg, 0, UINT_MAX, &errstr); 291 if (errstr) { 292 syslog(LOG_ERR, 293 "%s is a bad value for -m, aborting", 294 optarg); 295 exit(2); 296 } 297 break; 298 299 case 'M': 300 multihome = 1; 301 break; 302 303 case 'n': 304 anon_ok = 0; 305 break; 306 307 case 'S': 308 stats = 1; 309 break; 310 311 case 't': 312 timeout = strtonum(optarg, 0, INT_MAX, &errstr); 313 if (errstr) { 314 syslog(LOG_ERR, 315 "%s is a bad value for -t, aborting", 316 optarg); 317 exit(2); 318 } 319 if (maxtimeout < timeout) 320 maxtimeout = timeout; 321 break; 322 323 case 'T': 324 maxtimeout = strtonum(optarg, 0, INT_MAX, 325 &errstr); 326 if (errstr) { 327 syslog(LOG_ERR, 328 "%s is a bad value for -T, aborting", 329 optarg); 330 exit(2); 331 } 332 if (timeout > maxtimeout) 333 timeout = maxtimeout; 334 break; 335 336 case 'u': 337 { 338 long val = 0; 339 char *p; 340 umaskchange = 0; 341 342 val = strtol(optarg, &p, 8); 343 if (*optarg == '\0' || *p != '\0' || val < 0 || 344 (val & ~ACCESSPERMS)) { 345 syslog(LOG_ERR, 346 "%s is a bad value for -u, aborting", 347 optarg); 348 exit(2); 349 } 350 defumask = val; 351 break; 352 } 353 354 case 'U': 355 doutmp = 1; 356 break; 357 358 case 'W': 359 nowtmp = 1; 360 break; 361 362 case '4': 363 family = AF_INET; 364 break; 365 366 case '6': 367 family = AF_INET6; 368 break; 369 370 default: 371 usage(); 372 break; 373 } 374 } 375 376 if (nowtmp && doutmp) { 377 syslog(LOG_ERR, "options 'U' and 'W' are mutually exclusive"); 378 exit(1); 379 } 380 381 (void) freopen(_PATH_DEVNULL, "w", stderr); 382 383 /* 384 * LOG_NDELAY sets up the logging connection immediately, 385 * necessary for anonymous ftp's that chroot and can't do it later. 386 */ 387 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 388 389 if (getpwnam(FTPD_PRIVSEP_USER) == NULL) { 390 syslog(LOG_ERR, "privilege separation user %s not found", 391 FTPD_PRIVSEP_USER); 392 exit(1); 393 } 394 endpwent(); 395 396 if (daemon_mode) { 397 int *fds, i, fd; 398 struct pollfd *pfds; 399 struct addrinfo hints, *res, *res0; 400 nfds_t n; 401 402 /* 403 * Detach from parent. 404 */ 405 if (daemon(1, 1) < 0) { 406 syslog(LOG_ERR, "failed to become a daemon"); 407 exit(1); 408 } 409 sa.sa_handler = reapchild; 410 (void) sigaction(SIGCHLD, &sa, NULL); 411 412 memset(&hints, 0, sizeof(hints)); 413 hints.ai_family = family; 414 hints.ai_socktype = SOCK_STREAM; 415 hints.ai_protocol = IPPROTO_TCP; 416 hints.ai_flags = AI_PASSIVE; 417 error = getaddrinfo(NULL, "ftp", &hints, &res0); 418 if (error) { 419 syslog(LOG_ERR, "%s", gai_strerror(error)); 420 exit(1); 421 } 422 423 n = 0; 424 for (res = res0; res; res = res->ai_next) 425 n++; 426 427 fds = calloc(n, sizeof(int)); 428 pfds = calloc(n, sizeof(struct pollfd)); 429 if (!fds || !pfds) { 430 syslog(LOG_ERR, "%s", strerror(errno)); 431 exit(1); 432 } 433 434 /* 435 * Open sockets, bind it to the FTP port, and start 436 * listening. 437 */ 438 n = 0; 439 for (res = res0; res; res = res->ai_next) { 440 fds[n] = socket(res->ai_family, res->ai_socktype, 441 res->ai_protocol); 442 if (fds[n] < 0) 443 continue; 444 445 if (setsockopt(fds[n], SOL_SOCKET, SO_KEEPALIVE, 446 &on, sizeof(on)) < 0) { 447 close(fds[n]); 448 fds[n] = -1; 449 continue; 450 } 451 452 if (setsockopt(fds[n], SOL_SOCKET, SO_REUSEADDR, 453 &on, sizeof(on)) < 0) { 454 close(fds[n]); 455 fds[n] = -1; 456 continue; 457 } 458 459 if (bind(fds[n], res->ai_addr, res->ai_addrlen) < 0) { 460 close(fds[n]); 461 fds[n] = -1; 462 continue; 463 } 464 if (listen(fds[n], 32) < 0) { 465 close(fds[n]); 466 fds[n] = -1; 467 continue; 468 } 469 470 pfds[n].fd = fds[n]; 471 pfds[n].events = POLLIN; 472 n++; 473 } 474 freeaddrinfo(res0); 475 476 if (n == 0) { 477 syslog(LOG_ERR, "could not open control socket"); 478 exit(1); 479 } 480 481 /* 482 * Loop forever accepting connection requests and forking off 483 * children to handle them. 484 */ 485 while (1) { 486 if (poll(pfds, n, INFTIM) < 0) { 487 if (errno == EINTR) 488 continue; 489 syslog(LOG_ERR, "poll: %m"); 490 exit(1); 491 } 492 for (i = 0; i < n; i++) 493 if (pfds[i].revents & POLLIN) { 494 addrlen = sizeof(his_addr); 495 fd = accept(pfds[i].fd, 496 (struct sockaddr *)&his_addr, 497 &addrlen); 498 if (fd != -1) { 499 if (fork() == 0) 500 goto child; 501 close(fd); 502 } 503 } 504 } 505 506 child: 507 /* child */ 508 (void)dup2(fd, STDIN_FILENO); 509 (void)dup2(fd, STDOUT_FILENO); 510 for (i = 0; i < n; i++) 511 close(fds[i]); 512 } else { 513 addrlen = sizeof(his_addr); 514 if (getpeername(0, (struct sockaddr *)&his_addr, 515 &addrlen) < 0) { 516 /* syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); */ 517 exit(1); 518 } 519 } 520 521 /* set this here so klogin can use it... */ 522 (void)snprintf(ttyline, sizeof(ttyline), "ftp%ld", (long)getpid()); 523 524 set_slave_signals(); 525 526 addrlen = sizeof(ctrl_addr); 527 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 528 syslog(LOG_ERR, "getsockname: %m"); 529 exit(1); 530 } 531 if (his_addr.su_family == AF_INET6 && 532 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 533#if 1 534 /* 535 * IPv4 control connection arrived to AF_INET6 socket. 536 * I hate to do this, but this is the easiest solution. 537 */ 538 union sockunion tmp_addr; 539 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 540 541 tmp_addr = his_addr; 542 memset(&his_addr, 0, sizeof(his_addr)); 543 his_addr.su_sin.sin_family = AF_INET; 544 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 545 memcpy(&his_addr.su_sin.sin_addr, 546 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 547 sizeof(his_addr.su_sin.sin_addr)); 548 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 549 550 tmp_addr = ctrl_addr; 551 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 552 ctrl_addr.su_sin.sin_family = AF_INET; 553 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 554 memcpy(&ctrl_addr.su_sin.sin_addr, 555 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 556 sizeof(ctrl_addr.su_sin.sin_addr)); 557 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 558#else 559 while (fgets(line, sizeof(line), fd) != NULL) { 560 line[strcspn(line, "\n")] = '\0'; 561 lreply(530, "%s", line); 562 } 563 (void) fflush(stdout); 564 (void) close(fd); 565 reply(530, 566 "Connection from IPv4 mapped address is not supported."); 567 exit(0); 568#endif 569 } 570#ifdef IP_TOS 571 if (his_addr.su_family == AF_INET) { 572 tos = IPTOS_LOWDELAY; 573 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, 574 sizeof(int)) < 0) 575 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 576 } 577#endif 578 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 579 580 /* Try to handle urgent data inline */ 581#ifdef SO_OOBINLINE 582 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 583 syslog(LOG_ERR, "setsockopt: %m"); 584#endif 585 586 dolog((struct sockaddr *)&his_addr); 587 588 /* 589 * Set up default state 590 */ 591 data = -1; 592 type = TYPE_A; 593 form = FORM_N; 594 stru = STRU_F; 595 mode = MODE_S; 596 tmpline[0] = '\0'; 597 598 /* If logins are disabled, print out the message. */ 599 if ((fp = fopen(_PATH_NOLOGIN, "r")) != NULL) { 600 while (fgets(line, sizeof(line), fp) != NULL) { 601 line[strcspn(line, "\n")] = '\0'; 602 lreply(530, "%s", line); 603 } 604 (void) fflush(stdout); 605 (void) fclose(fp); 606 reply(530, "System not available."); 607 exit(0); 608 } 609 if ((fp = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 610 while (fgets(line, sizeof(line), fp) != NULL) { 611 line[strcspn(line, "\n")] = '\0'; 612 lreply(220, "%s", line); 613 } 614 (void) fflush(stdout); 615 (void) fclose(fp); 616 /* reply(220,) must follow */ 617 } 618 (void) gethostname(hostname, sizeof(hostname)); 619 620 /* Make sure hostname is fully qualified. */ 621 hp = gethostbyname(hostname); 622 if (hp != NULL) 623 strlcpy(hostname, hp->h_name, sizeof(hostname)); 624 625 if (multihome) { 626 error = getnameinfo((struct sockaddr *)&ctrl_addr, 627 ctrl_addr.su_len, dhostname, sizeof(dhostname), NULL, 0, 0); 628 } 629 630 if (error != 0) 631 reply(220, "FTP server ready."); 632 else 633 reply(220, "%s FTP server ready.", 634 (multihome ? dhostname : hostname)); 635 636 monitor_init(); 637 638 for (;;) 639 (void) yyparse(); 640 /* NOTREACHED */ 641} 642 643/* 644 * Signal handlers. 645 */ 646/*ARGSUSED*/ 647static void 648lostconn(int signo) 649{ 650 struct syslog_data sdata = SYSLOG_DATA_INIT; 651 652 sdata.log_fac = LOG_FTP; 653 if (debug) 654 syslog_r(LOG_DEBUG, &sdata, "lost connection"); 655 dologout(1); 656} 657 658static void 659sigquit(int signo) 660{ 661 struct syslog_data sdata = SYSLOG_DATA_INIT; 662 663 sdata.log_fac = LOG_FTP; 664 syslog_r(LOG_DEBUG, &sdata, "got signal %s", sys_signame[signo]); 665 dologout(1); 666} 667 668/* 669 * Save the result of a getpwnam. Used for USER command, since 670 * the data returned must not be clobbered by any other command 671 * (e.g., globbing). 672 */ 673static struct passwd * 674sgetpwnam(char *name, struct passwd *pw) 675{ 676 static struct passwd *save; 677 struct passwd *old; 678 679 if (pw == NULL && (pw = getpwnam(name)) == NULL) 680 return (NULL); 681 old = save; 682 save = pw_dup(pw); 683 if (save == NULL) { 684 perror_reply(421, "Local resource failure: malloc"); 685 dologout(1); 686 /* NOTREACHED */ 687 } 688 if (old) { 689 explicit_bzero(old->pw_passwd, strlen(old->pw_passwd)); 690 free(old); 691 } 692 return (save); 693} 694 695static int login_attempts; /* number of failed login attempts */ 696static int askpasswd; /* had user command, ask for passwd */ 697static char curname[LOGIN_NAME_MAX]; /* current USER name */ 698 699/* 700 * USER command. 701 * Sets global passwd pointer pw if named account exists and is acceptable; 702 * sets askpasswd if a PASS command is expected. If logged in previously, 703 * need to reset state. If name is "ftp" or "anonymous", the name is not in 704 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 705 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 706 * requesting login privileges. Disallow anyone who does not have a standard 707 * shell as returned by getusershell(). Disallow anyone mentioned in the file 708 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 709 */ 710void 711user(char *name) 712{ 713 char *cp, *shell, *style, *host; 714 char *class = NULL; 715 716 if (logged_in) { 717 kill_slave("user already logged in"); 718 end_login(); 719 } 720 721 /* Close session from previous user if there was one. */ 722 if (as) { 723 auth_close(as); 724 as = NULL; 725 } 726 if (lc) { 727 login_close(lc); 728 lc = NULL; 729 } 730 731 if ((style = strchr(name, ':')) != NULL) 732 *style++ = 0; 733 734 guest = 0; 735 askpasswd = 0; 736 host = multihome ? dhostname : hostname; 737 if (anon_ok && 738 (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0)) { 739 if (checkuser(_PATH_FTPUSERS, "ftp") || 740 checkuser(_PATH_FTPUSERS, "anonymous")) 741 reply(530, "User %s access denied.", name); 742 else if ((pw = sgetpwnam("ftp", NULL)) != NULL) { 743 if ((lc = login_getclass(pw->pw_class)) == NULL || 744 (as = auth_open()) == NULL || 745 auth_setpwd(as, pw) != 0 || 746 auth_setoption(as, "FTPD_HOST", host) < 0) { 747 if (as) { 748 auth_close(as); 749 as = NULL; 750 } 751 if (lc) { 752 login_close(lc); 753 lc = NULL; 754 } 755 reply(421, "Local resource failure"); 756 return; 757 } 758 guest = 1; 759 askpasswd = 1; 760 reply(331, 761 "Guest login ok, send your email address as password."); 762 } else 763 reply(530, "User %s unknown.", name); 764 if (!askpasswd && logging) 765 syslog(LOG_NOTICE, 766 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 767 return; 768 } 769 770 shell = _PATH_BSHELL; 771 if ((pw = sgetpwnam(name, NULL))) { 772 class = pw->pw_class; 773 if (pw->pw_shell != NULL && *pw->pw_shell != '\0') 774 shell = pw->pw_shell; 775 while ((cp = getusershell()) != NULL) 776 if (strcmp(cp, shell) == 0) 777 break; 778 shell = cp; 779 endusershell(); 780 } 781 782 /* Get login class; if invalid style treat like unknown user. */ 783 lc = login_getclass(class); 784 if (lc && (style = login_getstyle(lc, style, "auth-ftp")) == NULL) { 785 login_close(lc); 786 lc = NULL; 787 pw = NULL; 788 } 789 790 /* Do pre-authentication setup. */ 791 if (lc && ((as = auth_open()) == NULL || 792 (pw != NULL && auth_setpwd(as, pw) != 0) || 793 auth_setitem(as, AUTHV_STYLE, style) < 0 || 794 auth_setitem(as, AUTHV_NAME, name) < 0 || 795 auth_setitem(as, AUTHV_CLASS, class) < 0 || 796 auth_setoption(as, "login", "yes") < 0 || 797 auth_setoption(as, "notickets", "yes") < 0 || 798 auth_setoption(as, "FTPD_HOST", host) < 0)) { 799 if (as) { 800 auth_close(as); 801 as = NULL; 802 } 803 login_close(lc); 804 lc = NULL; 805 reply(421, "Local resource failure"); 806 return; 807 } 808 if (logging) 809 strlcpy(curname, name, sizeof(curname)); 810 811 dochroot = (lc && login_getcapbool(lc, "ftp-chroot", 0)) || 812 checkuser(_PATH_FTPCHROOT, name); 813 if (anon_only && !dochroot) { 814 reply(530, "User %s access denied.", name); 815 return; 816 } 817 if (pw) { 818 if (pw->pw_uid < minuid) { 819 reply(530, "User %s access denied.", name); 820 if (logging) 821 syslog(LOG_NOTICE, 822 "FTP LOGIN REFUSED FROM %s, %s (UID))", 823 remotehost, name); 824 return; 825 } 826 if ((!shell && !dochroot) || checkuser(_PATH_FTPUSERS, name)) { 827 reply(530, "User %s access denied.", name); 828 if (logging) 829 syslog(LOG_NOTICE, 830 "FTP LOGIN REFUSED FROM %s, %s", 831 remotehost, name); 832 pw = NULL; 833 return; 834 } 835 } 836 837 if (as != NULL && (cp = auth_challenge(as)) != NULL) 838 reply(331, "%s", cp); 839 else 840 reply(331, "Password required for %s.", name); 841 842 askpasswd = 1; 843 /* 844 * Delay before reading passwd after first failed 845 * attempt to slow down passwd-guessing programs. 846 */ 847 if (login_attempts) 848 sleep((unsigned) login_attempts); 849} 850 851/* 852 * Check if a user is in the file "fname" 853 */ 854static int 855checkuser(char *fname, char *name) 856{ 857 FILE *fp; 858 int found = 0; 859 char *p, line[BUFSIZ]; 860 861 if ((fp = fopen(fname, "r")) != NULL) { 862 while (fgets(line, sizeof(line), fp) != NULL) 863 if ((p = strchr(line, '\n')) != NULL) { 864 *p = '\0'; 865 if (line[0] == '#') 866 continue; 867 if (strcmp(line, name) == 0) { 868 found = 1; 869 break; 870 } 871 } 872 (void) fclose(fp); 873 } 874 return (found); 875} 876 877/* 878 * Terminate login as previous user, if any, resetting state; 879 * used when USER command is given or login fails. 880 */ 881static void 882end_login(void) 883{ 884 sigprocmask (SIG_BLOCK, &allsigs, NULL); 885 if (logged_in) { 886 if (!nowtmp) 887 ftpdlogwtmp(ttyline, "", ""); 888 if (doutmp) 889 ftpd_logout(utmp.ut_line); 890 } 891 reply(530, "Please reconnect to work as another user"); 892 _exit(0); 893} 894 895enum auth_ret 896pass(char *passwd) 897{ 898 int authok; 899 unsigned int flags; 900 FILE *fp; 901 static char homedir[PATH_MAX]; 902 char *motd, *dir, rootdir[PATH_MAX]; 903 size_t sz_pw_dir; 904 905 if (logged_in || askpasswd == 0) { 906 reply(503, "Login with USER first."); 907 return (AUTH_FAILED); 908 } 909 askpasswd = 0; 910 if (!guest) { /* "ftp" is only account allowed no password */ 911 authok = 0; 912 if (pw == NULL || pw->pw_passwd[0] == '\0') { 913 useconds_t us; 914 915 /* Sleep between 1 and 3 seconds to emulate a crypt. */ 916 us = arc4random_uniform(3000000); 917 usleep(us); 918 if (as != NULL) { 919 auth_close(as); 920 as = NULL; 921 } 922 } else { 923 authok = auth_userresponse(as, passwd, 0); 924 as = NULL; 925 } 926 if (authok == 0) { 927 reply(530, "Login incorrect."); 928 if (logging) 929 syslog(LOG_NOTICE, 930 "FTP LOGIN FAILED FROM %s, %s", 931 remotehost, curname); 932 pw = NULL; 933 if (login_attempts++ >= 5) { 934 syslog(LOG_NOTICE, 935 "repeated login failures from %s", 936 remotehost); 937 kill_slave("repeated login failures"); 938 _exit(0); 939 } 940 return (AUTH_FAILED); 941 } 942 } else if (lc != NULL) { 943 /* Save anonymous' password. */ 944 if (guestpw != NULL) 945 free(guestpw); 946 guestpw = strdup(passwd); 947 if (guestpw == NULL) { 948 kill_slave("out of mem"); 949 fatal("Out of memory."); 950 } 951 952 authok = auth_approval(as, lc, pw->pw_name, "ftp"); 953 auth_close(as); 954 as = NULL; 955 if (authok == 0) { 956 syslog(LOG_INFO|LOG_AUTH, 957 "FTP LOGIN FAILED (HOST) as %s: approval failure.", 958 pw->pw_name); 959 reply(530, "Approval failure."); 960 kill_slave("approval failure"); 961 _exit(0); 962 } 963 } else { 964 syslog(LOG_INFO|LOG_AUTH, 965 "FTP LOGIN CLASS %s MISSING for %s: approval failure.", 966 pw->pw_class, pw->pw_name); 967 reply(530, "Permission denied."); 968 kill_slave("permission denied"); 969 _exit(0); 970 } 971 972 if (monitor_post_auth() == 1) { 973 /* Post-auth monitor process */ 974 logged_in = 1; 975 return (AUTH_MONITOR); 976 } 977 978 login_attempts = 0; /* this time successful */ 979 /* set umask via setusercontext() unless -u flag was given. */ 980 flags = LOGIN_SETGROUP|LOGIN_SETPRIORITY|LOGIN_SETRESOURCES; 981 if (umaskchange) 982 flags |= LOGIN_SETUMASK; 983 else 984 (void) umask(defumask); 985 if (setusercontext(lc, pw, (uid_t)0, flags) != 0) { 986 perror_reply(421, "Local resource failure: setusercontext"); 987 syslog(LOG_NOTICE, "setusercontext: %m"); 988 dologout(1); 989 /* NOTREACHED */ 990 } 991 992 /* open wtmp before chroot */ 993 if (!nowtmp) 994 ftpdlogwtmp(ttyline, pw->pw_name, remotehost); 995 996 /* open utmp before chroot */ 997 if (doutmp) { 998 memset((void *)&utmp, 0, sizeof(utmp)); 999 (void)time(&utmp.ut_time); 1000 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 1001 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 1002 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 1003 ftpd_login(&utmp); 1004 } 1005 1006 /* open stats file before chroot */ 1007 if (guest && (stats == 1) && (statfd < 0)) 1008 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1009 stats = 0; 1010 1011 logged_in = 1; 1012 1013 if ((dir = login_getcapstr(lc, "ftp-dir", NULL, NULL))) { 1014 char *newdir; 1015 1016 newdir = copy_dir(dir, pw); 1017 if (newdir == NULL) { 1018 perror_reply(421, "Local resource failure: malloc"); 1019 dologout(1); 1020 /* NOTREACHED */ 1021 } 1022 pw->pw_dir = newdir; 1023 pw = sgetpwnam(NULL, pw); 1024 free(dir); 1025 free(newdir); 1026 } 1027 1028 /* make sure pw->pw_dir is big enough to hold "/" */ 1029 sz_pw_dir = strlen(pw->pw_dir) + 1; 1030 if (sz_pw_dir < 2) { 1031 pw->pw_dir = "/"; 1032 pw = sgetpwnam(NULL, pw); 1033 sz_pw_dir = 2; 1034 } 1035 1036 if (guest || dochroot) { 1037 if (multihome && guest) { 1038 struct stat ts; 1039 1040 /* Compute root directory. */ 1041 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1042 pw->pw_dir, dhostname); 1043 if (stat(rootdir, &ts) < 0) { 1044 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1045 pw->pw_dir, hostname); 1046 } 1047 } else 1048 strlcpy(rootdir, pw->pw_dir, sizeof(rootdir)); 1049 } 1050 if (guest) { 1051 /* 1052 * We MUST do a chdir() after the chroot. Otherwise 1053 * the old current directory will be accessible as "." 1054 * outside the new root! 1055 */ 1056 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1057 reply(550, "Can't set guest privileges."); 1058 goto bad; 1059 } 1060 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1061 if (setenv("HOME", "/", 1) == -1) { 1062 reply(550, "Can't setup environment."); 1063 goto bad; 1064 } 1065 } else if (dochroot) { 1066 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1067 reply(550, "Can't change root."); 1068 goto bad; 1069 } 1070 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1071 if (setenv("HOME", "/", 1) == -1) { 1072 reply(550, "Can't setup environment."); 1073 goto bad; 1074 } 1075 } else if (chdir(pw->pw_dir) < 0) { 1076 if (chdir("/") < 0) { 1077 reply(530, "User %s: can't change directory to %s.", 1078 pw->pw_name, pw->pw_dir); 1079 goto bad; 1080 } else 1081 lreply(230, "No directory! Logging in with home=/"); 1082 } 1083 if (setegid(pw->pw_gid) < 0 || setgid(pw->pw_gid) < 0) { 1084 reply(550, "Can't set gid."); 1085 goto bad; 1086 } 1087 if (seteuid(pw->pw_uid) < 0 || setuid(pw->pw_uid) < 0) { 1088 reply(550, "Can't set uid."); 1089 goto bad; 1090 } 1091 sigprocmask(SIG_UNBLOCK, &allsigs, NULL); 1092 1093 /* 1094 * Set home directory so that use of ~ (tilde) works correctly. 1095 */ 1096 if (getcwd(homedir, PATH_MAX) != NULL) { 1097 if (setenv("HOME", homedir, 1) == -1) { 1098 reply(550, "Can't setup environment."); 1099 goto bad; 1100 } 1101 } 1102 1103 /* 1104 * Display a login message, if it exists. 1105 * N.B. reply(230,) must follow the message. 1106 */ 1107 motd = login_getcapstr(lc, "welcome", NULL, NULL); 1108 if ((fp = fopen(motd ? motd : _PATH_FTPLOGINMESG, "r")) != NULL) { 1109 char line[LINE_MAX]; 1110 1111 while (fgets(line, sizeof(line), fp) != NULL) { 1112 line[strcspn(line, "\n")] = '\0'; 1113 lreply(230, "%s", line); 1114 } 1115 (void) fflush(stdout); 1116 (void) fclose(fp); 1117 } 1118 if (motd != NULL) 1119 free(motd); 1120 if (guest) { 1121 reply(230, "Guest login ok, access restrictions apply."); 1122#ifdef HASSETPROCTITLE 1123 snprintf(proctitle, sizeof(proctitle), 1124 "%s: anonymous/%.*s", remotehost, 1125 (int)(sizeof(proctitle) - sizeof(remotehost) - 1126 sizeof(": anonymous/")), passwd); 1127 setproctitle("%s", proctitle); 1128#endif /* HASSETPROCTITLE */ 1129 if (logging) 1130 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1131 remotehost, passwd); 1132 } else { 1133 reply(230, "User %s logged in.", pw->pw_name); 1134#ifdef HASSETPROCTITLE 1135 snprintf(proctitle, sizeof(proctitle), 1136 "%s: %s", remotehost, pw->pw_name); 1137 setproctitle("%s", proctitle); 1138#endif /* HASSETPROCTITLE */ 1139 if (logging) 1140 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1141 remotehost, pw->pw_name); 1142 } 1143 login_close(lc); 1144 lc = NULL; 1145 return (AUTH_SLAVE); 1146bad: 1147 /* Forget all about it... */ 1148 login_close(lc); 1149 lc = NULL; 1150 end_login(); 1151 return (AUTH_FAILED); 1152} 1153 1154void 1155retrieve(char *cmd, char *name) 1156{ 1157 FILE *fin, *dout; 1158 struct stat st; 1159 pid_t pid; 1160 time_t start; 1161 1162 if (cmd == 0) { 1163 fin = fopen(name, "r"); 1164 st.st_size = 0; 1165 } else { 1166 char line[BUFSIZ]; 1167 1168 (void) snprintf(line, sizeof(line), cmd, name); 1169 name = line; 1170 fin = ftpd_popen(line, "r", &pid); 1171 st.st_size = -1; 1172 st.st_blksize = BUFSIZ; 1173 } 1174 if (fin == NULL) { 1175 if (errno != 0) { 1176 perror_reply(550, name); 1177 if (cmd == 0) { 1178 LOGCMD("get", name); 1179 } 1180 } 1181 return; 1182 } 1183 byte_count = -1; 1184 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1185 reply(550, "%s: not a plain file.", name); 1186 goto done; 1187 } 1188 if (restart_point) { 1189 if (type == TYPE_A) { 1190 off_t i, n; 1191 int c; 1192 1193 n = restart_point; 1194 i = 0; 1195 while (i++ < n) { 1196 if ((c = getc(fin)) == EOF) { 1197 if (ferror(fin)) { 1198 perror_reply(550, name); 1199 goto done; 1200 } else 1201 break; 1202 } 1203 if (c == '\n') 1204 i++; 1205 } 1206 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1207 perror_reply(550, name); 1208 goto done; 1209 } 1210 } 1211 dout = dataconn(name, st.st_size, "w"); 1212 if (dout == NULL) 1213 goto done; 1214 time(&start); 1215 send_data(fin, dout, (off_t)st.st_blksize, st.st_size, 1216 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 1217 if ((cmd == 0) && stats) 1218 logxfer(name, byte_count, start); 1219 (void) fclose(dout); 1220 data = -1; 1221done: 1222 if (pdata >= 0) 1223 (void) close(pdata); 1224 pdata = -1; 1225 if (cmd == 0) { 1226 LOGBYTES("get", name, byte_count); 1227 fclose(fin); 1228 } else { 1229 ftpd_pclose(fin, pid); 1230 } 1231} 1232 1233void 1234store(char *name, char *mode, int unique) 1235{ 1236 FILE *fout, *din; 1237 int (*closefunc)(FILE *); 1238 struct stat st; 1239 int fd; 1240 1241 if (restart_point && *mode != 'a') 1242 mode = "r+"; 1243 1244 if (unique && stat(name, &st) == 0) { 1245 char *nam; 1246 1247 fd = guniquefd(name, &nam); 1248 if (fd == -1) { 1249 LOGCMD(*mode == 'w' ? "put" : "append", name); 1250 return; 1251 } 1252 name = nam; 1253 fout = fdopen(fd, mode); 1254 } else 1255 fout = fopen(name, mode); 1256 1257 closefunc = fclose; 1258 if (fout == NULL) { 1259 perror_reply(553, name); 1260 LOGCMD(*mode == 'w' ? "put" : "append", name); 1261 return; 1262 } 1263 byte_count = -1; 1264 if (restart_point) { 1265 if (type == TYPE_A) { 1266 off_t i, n; 1267 int c; 1268 1269 n = restart_point; 1270 i = 0; 1271 while (i++ < n) { 1272 if ((c = getc(fout)) == EOF) { 1273 if (ferror(fout)) { 1274 perror_reply(550, name); 1275 goto done; 1276 } else 1277 break; 1278 } 1279 if (c == '\n') 1280 i++; 1281 } 1282 /* 1283 * We must do this seek to "current" position 1284 * because we are changing from reading to 1285 * writing. 1286 */ 1287 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1288 perror_reply(550, name); 1289 goto done; 1290 } 1291 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1292 perror_reply(550, name); 1293 goto done; 1294 } 1295 } 1296 din = dataconn(name, (off_t)-1, "r"); 1297 if (din == NULL) 1298 goto done; 1299 if (receive_data(din, fout) == 0) { 1300 if (unique) 1301 reply(226, "Transfer complete (unique file name:%s).", 1302 name); 1303 else 1304 reply(226, "Transfer complete."); 1305 } 1306 (void) fclose(din); 1307 data = -1; 1308 pdata = -1; 1309done: 1310 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1311 (*closefunc)(fout); 1312} 1313 1314static FILE * 1315getdatasock(char *mode) 1316{ 1317 int on = 1, s, t, tries; 1318 1319 if (data >= 0) 1320 return (fdopen(data, mode)); 1321 sigprocmask (SIG_BLOCK, &allsigs, NULL); 1322 s = monitor_socket(ctrl_addr.su_family); 1323 if (s < 0) 1324 goto bad; 1325 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1326 &on, sizeof(on)) < 0) 1327 goto bad; 1328 /* anchor socket to avoid multi-homing problems */ 1329 data_source = ctrl_addr; 1330 data_source.su_port = htons(20); /* ftp-data port */ 1331 for (tries = 1; ; tries++) { 1332 if (monitor_bind(s, (struct sockaddr *)&data_source, 1333 data_source.su_len) >= 0) 1334 break; 1335 if (errno != EADDRINUSE || tries > 10) 1336 goto bad; 1337 sleep((unsigned int)tries); 1338 } 1339 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1340 1341#ifdef IP_TOS 1342 if (ctrl_addr.su_family == AF_INET) { 1343 on = IPTOS_THROUGHPUT; 1344 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, 1345 sizeof(int)) < 0) 1346 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1347 } 1348#endif 1349#ifdef TCP_NOPUSH 1350 /* 1351 * Turn off push flag to keep sender TCP from sending short packets 1352 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1353 * to set the send buffer size as well, but that may not be desirable 1354 * in heavy-load situations. 1355 */ 1356 on = 1; 1357 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof(on)) < 0) 1358 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1359#endif 1360#ifdef SO_SNDBUF 1361 on = 65536; 1362 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof(on)) < 0) 1363 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1364#endif 1365 1366 return (fdopen(s, mode)); 1367bad: 1368 /* Return the real value of errno (close may change it) */ 1369 t = errno; 1370 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1371 if (s >= 0) 1372 (void) close(s); 1373 errno = t; 1374 return (NULL); 1375} 1376 1377static FILE * 1378dataconn(char *name, off_t size, char *mode) 1379{ 1380 char sizebuf[32]; 1381 FILE *file = NULL; 1382 int retry = 0; 1383 in_port_t *p; 1384 u_char *fa, *ha; 1385 size_t alen; 1386 int error; 1387 1388 file_size = size; 1389 byte_count = 0; 1390 if (size != (off_t) -1) { 1391 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1392 size); 1393 } else 1394 sizebuf[0] = '\0'; 1395 if (pdata >= 0) { 1396 union sockunion from; 1397 int s; 1398 socklen_t fromlen = sizeof(from); 1399 1400 (void) alarm ((unsigned) timeout); 1401 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1402 (void) alarm (0); 1403 if (s < 0) { 1404 reply(425, "Can't open data connection."); 1405 (void) close(pdata); 1406 pdata = -1; 1407 return (NULL); 1408 } 1409 switch (from.su_family) { 1410 case AF_INET: 1411 p = (in_port_t *)&from.su_sin.sin_port; 1412 fa = (u_char *)&from.su_sin.sin_addr; 1413 ha = (u_char *)&his_addr.su_sin.sin_addr; 1414 alen = sizeof(struct in_addr); 1415 break; 1416 case AF_INET6: 1417 p = (in_port_t *)&from.su_sin6.sin6_port; 1418 fa = (u_char *)&from.su_sin6.sin6_addr; 1419 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1420 alen = sizeof(struct in6_addr); 1421 break; 1422 default: 1423 reply(425, "Can't build data connection: " 1424 "unknown address family"); 1425 (void) close(pdata); 1426 (void) close(s); 1427 pdata = -1; 1428 return (NULL); 1429 } 1430 if (from.su_family != his_addr.su_family || 1431 ntohs(*p) < IPPORT_RESERVED) { 1432 reply(425, "Can't build data connection: " 1433 "address family or port error"); 1434 (void) close(pdata); 1435 (void) close(s); 1436 pdata = -1; 1437 return (NULL); 1438 } 1439 if (portcheck && memcmp(fa, ha, alen) != 0) { 1440 reply(425, "Can't build data connection: " 1441 "illegal port number"); 1442 (void) close(pdata); 1443 (void) close(s); 1444 pdata = -1; 1445 return (NULL); 1446 } 1447 (void) close(pdata); 1448 pdata = s; 1449 reply(150, "Opening %s mode data connection for '%s'%s.", 1450 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1451 return (fdopen(pdata, mode)); 1452 } 1453 if (data >= 0) { 1454 reply(125, "Using existing data connection for '%s'%s.", 1455 name, sizebuf); 1456 usedefault = 1; 1457 return (fdopen(data, mode)); 1458 } 1459 if (usedefault) 1460 data_dest = his_addr; 1461 usedefault = 1; 1462 do { 1463 if (file != NULL) 1464 (void) fclose(file); 1465 file = getdatasock(mode); 1466 if (file == NULL) { 1467 char hbuf[HOST_NAME_MAX+1], pbuf[10]; 1468 1469 error = getnameinfo((struct sockaddr *)&data_source, 1470 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 1471 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV); 1472 if (error != 0) 1473 reply(425, "Can't create data socket: %s.", 1474 strerror(errno)); 1475 else 1476 reply(425, 1477 "Can't create data socket (%s,%s): %s.", 1478 hbuf, pbuf, strerror(errno)); 1479 return (NULL); 1480 } 1481 1482 /* 1483 * attempt to connect to reserved port on client machine; 1484 * this looks like an attack 1485 */ 1486 switch (data_dest.su_family) { 1487 case AF_INET: 1488 p = (in_port_t *)&data_dest.su_sin.sin_port; 1489 fa = (u_char *)&data_dest.su_sin.sin_addr; 1490 ha = (u_char *)&his_addr.su_sin.sin_addr; 1491 alen = sizeof(struct in_addr); 1492 break; 1493 case AF_INET6: 1494 p = (in_port_t *)&data_dest.su_sin6.sin6_port; 1495 fa = (u_char *)&data_dest.su_sin6.sin6_addr; 1496 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1497 alen = sizeof(struct in6_addr); 1498 break; 1499 default: 1500 reply(425, "Can't build data connection: " 1501 "unknown address family"); 1502 (void) fclose(file); 1503 pdata = -1; 1504 return (NULL); 1505 } 1506 if (data_dest.su_family != his_addr.su_family || 1507 ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */ 1508 reply(425, "Can't build data connection: " 1509 "address family or port error"); 1510 (void) fclose(file); 1511 return NULL; 1512 } 1513 if (portcheck && memcmp(fa, ha, alen) != 0) { 1514 reply(435, "Can't build data connection: " 1515 "illegal port number"); 1516 (void) fclose(file); 1517 return NULL; 1518 } 1519 1520 if (connect(fileno(file), (struct sockaddr *)&data_dest, 1521 data_dest.su_len) == 0) { 1522 reply(150, "Opening %s mode data connection for '%s'%s.", 1523 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1524 data = fileno(file); 1525 return (file); 1526 } 1527 if (errno != EADDRINUSE) 1528 break; 1529 sleep((unsigned) swaitint); 1530 retry += swaitint; 1531 } while (retry <= swaitmax); 1532 perror_reply(425, "Can't build data connection"); 1533 (void) fclose(file); 1534 return (NULL); 1535} 1536 1537/* 1538 * Transfer the contents of "instr" to "outstr" peer using the appropriate 1539 * encapsulation of the data subject to Mode, Structure, and Type. 1540 * 1541 * NB: Form isn't handled. 1542 */ 1543static int 1544send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1545{ 1546 int c, cnt, filefd, netfd; 1547 char *buf, *bp; 1548 size_t len; 1549 1550 transflag++; 1551 switch (type) { 1552 1553 case TYPE_A: 1554 while ((c = getc(instr)) != EOF) { 1555 if (recvurg) 1556 goto got_oob; 1557 byte_count++; 1558 if (c == '\n') { 1559 if (ferror(outstr)) 1560 goto data_err; 1561 (void) putc('\r', outstr); 1562 } 1563 (void) putc(c, outstr); 1564 } 1565 fflush(outstr); 1566 transflag = 0; 1567 if (ferror(instr)) 1568 goto file_err; 1569 if (ferror(outstr)) 1570 goto data_err; 1571 reply(226, "Transfer complete."); 1572 return(0); 1573 1574 case TYPE_I: 1575 case TYPE_L: 1576 /* 1577 * isreg is only set if we are not doing restart and we 1578 * are sending a regular file 1579 */ 1580 netfd = fileno(outstr); 1581 filefd = fileno(instr); 1582 1583 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1584 size_t fsize = (size_t)filesize; 1585 1586 if (fsize == 0) { 1587 transflag = 0; 1588 reply(226, "Transfer complete."); 1589 return(0); 1590 } 1591 1592 buf = mmap(0, fsize, PROT_READ, MAP_SHARED, filefd, 1593 (off_t)0); 1594 if (buf == MAP_FAILED) { 1595 syslog(LOG_WARNING, "mmap(%llu): %m", 1596 (unsigned long long)fsize); 1597 goto oldway; 1598 } 1599 bp = buf; 1600 len = fsize; 1601 do { 1602 cnt = write(netfd, bp, len); 1603 if (recvurg) { 1604 munmap(buf, fsize); 1605 goto got_oob; 1606 } 1607 len -= cnt; 1608 bp += cnt; 1609 if (cnt > 0) 1610 byte_count += cnt; 1611 } while(cnt > 0 && len > 0); 1612 1613 transflag = 0; 1614 munmap(buf, fsize); 1615 if (cnt < 0) 1616 goto data_err; 1617 reply(226, "Transfer complete."); 1618 return(0); 1619 } 1620 1621oldway: 1622 if ((buf = malloc((size_t)blksize)) == NULL) { 1623 transflag = 0; 1624 perror_reply(451, "Local resource failure: malloc"); 1625 return(-1); 1626 } 1627 1628 while ((cnt = read(filefd, buf, (size_t)blksize)) > 0 && 1629 write(netfd, buf, cnt) == cnt) 1630 byte_count += cnt; 1631 transflag = 0; 1632 (void)free(buf); 1633 if (cnt != 0) { 1634 if (cnt < 0) 1635 goto file_err; 1636 goto data_err; 1637 } 1638 reply(226, "Transfer complete."); 1639 return(0); 1640 default: 1641 transflag = 0; 1642 reply(550, "Unimplemented TYPE %d in send_data", type); 1643 return(-1); 1644 } 1645 1646data_err: 1647 transflag = 0; 1648 reply(426, "Data connection"); 1649 return(-1); 1650 1651file_err: 1652 transflag = 0; 1653 reply(551, "Error on input file"); 1654 return(-1); 1655 1656got_oob: 1657 myoob(); 1658 recvurg = 0; 1659 transflag = 0; 1660 return(-1); 1661} 1662 1663/* 1664 * Transfer data from peer to "outstr" using the appropriate encapulation of 1665 * the data subject to Mode, Structure, and Type. 1666 * 1667 * N.B.: Form isn't handled. 1668 */ 1669static int 1670receive_data(FILE *instr, FILE *outstr) 1671{ 1672 int c; 1673 int cnt; 1674 char buf[BUFSIZ]; 1675 struct sigaction sa, sa_saved; 1676 volatile int bare_lfs = 0; 1677 1678 transflag++; 1679 switch (type) { 1680 1681 case TYPE_I: 1682 case TYPE_L: 1683 memset(&sa, 0, sizeof(sa)); 1684 sigfillset(&sa.sa_mask); 1685 sa.sa_flags = SA_RESTART; 1686 sa.sa_handler = lostconn; 1687 (void) sigaction(SIGALRM, &sa, &sa_saved); 1688 do { 1689 (void) alarm ((unsigned) timeout); 1690 cnt = read(fileno(instr), buf, sizeof(buf)); 1691 (void) alarm (0); 1692 if (recvurg) 1693 goto got_oob; 1694 1695 if (cnt > 0) { 1696 if (write(fileno(outstr), buf, cnt) != cnt) 1697 goto file_err; 1698 byte_count += cnt; 1699 } 1700 } while (cnt > 0); 1701 (void) sigaction(SIGALRM, &sa_saved, NULL); 1702 if (cnt < 0) 1703 goto data_err; 1704 transflag = 0; 1705 return (0); 1706 1707 case TYPE_E: 1708 reply(553, "TYPE E not implemented."); 1709 transflag = 0; 1710 return (-1); 1711 1712 case TYPE_A: 1713 while ((c = getc(instr)) != EOF) { 1714 if (recvurg) 1715 goto got_oob; 1716 byte_count++; 1717 if (c == '\n') 1718 bare_lfs++; 1719 while (c == '\r') { 1720 if (ferror(outstr)) 1721 goto data_err; 1722 if ((c = getc(instr)) != '\n') { 1723 (void) putc ('\r', outstr); 1724 if (c == '\0' || c == EOF) 1725 goto contin2; 1726 } 1727 } 1728 (void) putc(c, outstr); 1729 contin2: ; 1730 } 1731 fflush(outstr); 1732 if (ferror(instr)) 1733 goto data_err; 1734 if (ferror(outstr)) 1735 goto file_err; 1736 transflag = 0; 1737 if (bare_lfs) { 1738 lreply(226, 1739 "WARNING! %d bare linefeeds received in ASCII mode", 1740 bare_lfs); 1741 printf(" File may not have transferred correctly.\r\n"); 1742 } 1743 return (0); 1744 default: 1745 reply(550, "Unimplemented TYPE %d in receive_data", type); 1746 transflag = 0; 1747 return (-1); 1748 } 1749 1750data_err: 1751 transflag = 0; 1752 reply(426, "Data Connection"); 1753 return (-1); 1754 1755file_err: 1756 transflag = 0; 1757 reply(452, "Error writing file"); 1758 return (-1); 1759 1760got_oob: 1761 myoob(); 1762 recvurg = 0; 1763 transflag = 0; 1764 return (-1); 1765} 1766 1767void 1768statfilecmd(char *filename) 1769{ 1770 FILE *fin; 1771 int c; 1772 int atstart; 1773 pid_t pid; 1774 char line[LINE_MAX]; 1775 1776 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1777 fin = ftpd_popen(line, "r", &pid); 1778 if (fin == NULL) { 1779 reply(451, "Local resource failure"); 1780 return; 1781 } 1782 lreply(211, "status of %s:", filename); 1783 atstart = 1; 1784 while ((c = getc(fin)) != EOF) { 1785 if (c == '\n') { 1786 if (ferror(stdout)){ 1787 perror_reply(421, "control connection"); 1788 (void) ftpd_pclose(fin, pid); 1789 dologout(1); 1790 /* NOTREACHED */ 1791 } 1792 if (ferror(fin)) { 1793 perror_reply(551, filename); 1794 (void) ftpd_pclose(fin, pid); 1795 return; 1796 } 1797 (void) putc('\r', stdout); 1798 } 1799 if (atstart && isdigit(c)) 1800 (void) putc(' ', stdout); 1801 (void) putc(c, stdout); 1802 atstart = (c == '\n'); 1803 } 1804 (void) ftpd_pclose(fin, pid); 1805 reply(211, "End of Status"); 1806} 1807 1808void 1809statcmd(void) 1810{ 1811 union sockunion *su; 1812 u_char *a, *p; 1813 char hbuf[HOST_NAME_MAX+1]; 1814 int ispassive; 1815 int error; 1816 1817 lreply(211, "%s FTP server status:", hostname); 1818 error = getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1819 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST); 1820 printf(" Connected to %s", remotehost); 1821 if (error == 0 && strcmp(remotehost, hbuf) != 0) 1822 printf(" (%s)", hbuf); 1823 printf("\r\n"); 1824 if (logged_in) { 1825 if (guest) 1826 printf(" Logged in anonymously\r\n"); 1827 else 1828 printf(" Logged in as %s\r\n", pw->pw_name); 1829 } else if (askpasswd) 1830 printf(" Waiting for password\r\n"); 1831 else 1832 printf(" Waiting for user name\r\n"); 1833 printf(" TYPE: %s", typenames[type]); 1834 if (type == TYPE_A || type == TYPE_E) 1835 printf(", FORM: %s", formnames[form]); 1836 if (type == TYPE_L) 1837#if NBBY == 8 1838 printf(" %d", NBBY); 1839#else 1840 printf(" %d", bytesize); /* need definition! */ 1841#endif 1842 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1843 strunames[stru], modenames[mode]); 1844 ispassive = 0; 1845 if (data != -1) 1846 printf(" Data connection open\r\n"); 1847 else if (pdata != -1) { 1848 printf(" in Passive mode\r\n"); 1849 su = (union sockunion *)&pasv_addr; 1850 ispassive++; 1851 goto printaddr; 1852 } else if (usedefault == 0) { 1853 size_t alen; 1854 int af, i; 1855 1856 su = (union sockunion *)&data_dest; 1857printaddr: 1858 /* PASV/PORT */ 1859 if (su->su_family == AF_INET) { 1860 if (ispassive) 1861 printf("211- PASV "); 1862 else 1863 printf("211- PORT "); 1864 a = (u_char *)&su->su_sin.sin_addr; 1865 p = (u_char *)&su->su_sin.sin_port; 1866 printf("(%u,%u,%u,%u,%u,%u)\r\n", 1867 a[0], a[1], a[2], a[3], 1868 p[0], p[1]); 1869 } 1870 1871 /* LPSV/LPRT */ 1872 alen = 0; 1873 switch (su->su_family) { 1874 case AF_INET: 1875 a = (u_char *)&su->su_sin.sin_addr; 1876 p = (u_char *)&su->su_sin.sin_port; 1877 alen = sizeof(su->su_sin.sin_addr); 1878 af = 4; 1879 break; 1880 case AF_INET6: 1881 a = (u_char *)&su->su_sin6.sin6_addr; 1882 p = (u_char *)&su->su_sin6.sin6_port; 1883 alen = sizeof(su->su_sin6.sin6_addr); 1884 af = 6; 1885 break; 1886 default: 1887 af = 0; 1888 break; 1889 } 1890 if (af) { 1891 if (ispassive) 1892 printf("211- LPSV "); 1893 else 1894 printf("211- LPRT "); 1895 printf("(%u,%llu", af, (unsigned long long)alen); 1896 for (i = 0; i < alen; i++) 1897 printf(",%u", a[i]); 1898 printf(",%u,%u,%u)\r\n", 2, p[0], p[1]); 1899 } 1900 1901 /* EPRT/EPSV */ 1902 switch (su->su_family) { 1903 case AF_INET: 1904 af = 1; 1905 break; 1906 case AF_INET6: 1907 af = 2; 1908 break; 1909 default: 1910 af = 0; 1911 break; 1912 } 1913 if (af) { 1914 char pbuf[10]; 1915 union sockunion tmp = *su; 1916 1917 if (tmp.su_family == AF_INET6) 1918 tmp.su_sin6.sin6_scope_id = 0; 1919 if (getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 1920 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1921 NI_NUMERICHOST | NI_NUMERICSERV) == 0) { 1922 if (ispassive) 1923 printf("211- EPSV "); 1924 else 1925 printf("211- EPRT "); 1926 printf("(|%u|%s|%s|)\r\n", 1927 af, hbuf, pbuf); 1928 } 1929 } 1930 } else 1931 printf(" No data connection\r\n"); 1932 reply(211, "End of status"); 1933} 1934 1935void 1936fatal(char *s) 1937{ 1938 1939 reply(451, "Error in server: %s", s); 1940 reply(221, "Closing connection due to server error."); 1941 dologout(0); 1942 /* NOTREACHED */ 1943} 1944 1945void 1946reply(int n, const char *fmt, ...) 1947{ 1948 char *buf, *p, *next; 1949 int rval; 1950 va_list ap; 1951 1952 va_start(ap, fmt); 1953 rval = vasprintf(&buf, fmt, ap); 1954 va_end(ap); 1955 if (rval == -1 || buf == NULL) { 1956 printf("421 Local resource failure: malloc\r\n"); 1957 fflush(stdout); 1958 dologout(1); 1959 } 1960 next = buf; 1961 while ((p = strsep(&next, "\n\r"))) { 1962 printf("%d%s %s\r\n", n, (next != NULL) ? "-" : "", p); 1963 if (debug) 1964 syslog(LOG_DEBUG, "<--- %d%s %s", n, 1965 (next != NULL) ? "-" : "", p); 1966 } 1967 (void)fflush(stdout); 1968 free(buf); 1969} 1970 1971 1972void 1973reply_r(int n, const char *fmt, ...) 1974{ 1975 char *p, *next; 1976 char msg[BUFSIZ]; 1977 char buf[BUFSIZ]; 1978 va_list ap; 1979 struct syslog_data sdata = SYSLOG_DATA_INIT; 1980 1981 sdata.log_fac = LOG_FTP; 1982 va_start(ap, fmt); 1983 vsnprintf(msg, sizeof(msg), fmt, ap); 1984 va_end(ap); 1985 1986 next = msg; 1987 1988 while ((p = strsep(&next, "\n\r"))) { 1989 snprintf(buf, sizeof(buf), "%d%s %s\r\n", n, 1990 (next != NULL) ? "-" : "", p); 1991 write(STDOUT_FILENO, buf, strlen(buf)); 1992 if (debug) { 1993 buf[strlen(buf) - 2] = '\0'; 1994 syslog_r(LOG_DEBUG, &sdata, "<--- %s", buf); 1995 } 1996 } 1997} 1998 1999void 2000lreply(int n, const char *fmt, ...) 2001{ 2002 va_list ap; 2003 2004 va_start(ap, fmt); 2005 (void)printf("%d- ", n); 2006 (void)vprintf(fmt, ap); 2007 va_end(ap); 2008 (void)printf("\r\n"); 2009 (void)fflush(stdout); 2010 if (debug) { 2011 va_start(ap, fmt); 2012 syslog(LOG_DEBUG, "<--- %d- ", n); 2013 vsyslog(LOG_DEBUG, fmt, ap); 2014 va_end(ap); 2015 } 2016} 2017 2018static void 2019ack(char *s) 2020{ 2021 2022 reply(250, "%s command successful.", s); 2023} 2024 2025void 2026nack(char *s) 2027{ 2028 2029 reply(502, "%s command not implemented.", s); 2030} 2031 2032/* ARGSUSED */ 2033void 2034yyerror(char *s) 2035{ 2036 cbuf[strcspn(cbuf, "\n")] = '\0'; 2037 reply(500, "'%s': command not understood.", cbuf); 2038} 2039 2040void 2041delete(char *name) 2042{ 2043 struct stat st; 2044 2045 LOGCMD("delete", name); 2046 if (stat(name, &st) < 0) { 2047 perror_reply(550, name); 2048 return; 2049 } 2050 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2051 if (rmdir(name) < 0) { 2052 perror_reply(550, name); 2053 return; 2054 } 2055 goto done; 2056 } 2057 if (unlink(name) < 0) { 2058 perror_reply(550, name); 2059 return; 2060 } 2061done: 2062 ack("DELE"); 2063} 2064 2065void 2066cwd(char *path) 2067{ 2068 FILE *message; 2069 2070 if (chdir(path) < 0) 2071 perror_reply(550, path); 2072 else { 2073 if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) { 2074 char line[LINE_MAX]; 2075 2076 while (fgets(line, sizeof(line), message) != NULL) { 2077 line[strcspn(line, "\n")] = '\0'; 2078 lreply(250, "%s", line); 2079 } 2080 (void) fflush(stdout); 2081 (void) fclose(message); 2082 } 2083 ack("CWD"); 2084 } 2085} 2086 2087void 2088replydirname(const char *name, const char *message) 2089{ 2090 char *p, *ep; 2091 char npath[PATH_MAX * 2]; 2092 2093 p = npath; 2094 ep = &npath[sizeof(npath) - 1]; 2095 while (*name) { 2096 if (*name == '"') { 2097 if (ep - p < 2) 2098 break; 2099 *p++ = *name++; 2100 *p++ = '"'; 2101 } else { 2102 if (ep - p < 1) 2103 break; 2104 *p++ = *name++; 2105 } 2106 } 2107 *p = '\0'; 2108 reply(257, "\"%s\" %s", npath, message); 2109} 2110 2111void 2112makedir(char *name) 2113{ 2114 2115 LOGCMD("mkdir", name); 2116 if (mkdir(name, 0777) < 0) 2117 perror_reply(550, name); 2118 else 2119 replydirname(name, "directory created."); 2120} 2121 2122void 2123removedir(char *name) 2124{ 2125 2126 LOGCMD("rmdir", name); 2127 if (rmdir(name) < 0) 2128 perror_reply(550, name); 2129 else 2130 ack("RMD"); 2131} 2132 2133void 2134pwd(void) 2135{ 2136 char path[PATH_MAX]; 2137 2138 if (getcwd(path, sizeof(path)) == NULL) 2139 perror_reply(550, "Can't get current directory"); 2140 else 2141 replydirname(path, "is current directory."); 2142} 2143 2144char * 2145renamefrom(char *name) 2146{ 2147 struct stat st; 2148 2149 if (stat(name, &st) < 0) { 2150 perror_reply(550, name); 2151 return ((char *)0); 2152 } 2153 reply(350, "File exists, ready for destination name"); 2154 return (name); 2155} 2156 2157void 2158renamecmd(char *from, char *to) 2159{ 2160 2161 LOGCMD2("rename", from, to); 2162 if (rename(from, to) < 0) 2163 perror_reply(550, "rename"); 2164 else 2165 ack("RNTO"); 2166} 2167 2168static void 2169dolog(struct sockaddr *sa) 2170{ 2171 char hbuf[sizeof(remotehost)]; 2172 2173 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0) == 0) 2174 (void) strlcpy(remotehost, hbuf, sizeof(remotehost)); 2175 else 2176 (void) strlcpy(remotehost, "unknown", sizeof(remotehost)); 2177 2178#ifdef HASSETPROCTITLE 2179 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2180 setproctitle("%s", proctitle); 2181#endif /* HASSETPROCTITLE */ 2182 2183 if (logging) { 2184 int error; 2185 error = getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), 2186 NULL, 0, NI_NUMERICHOST); 2187 syslog(LOG_INFO, "connection from %s [%s]", remotehost, 2188 error ? gai_strerror(error) : hbuf); 2189 } 2190} 2191 2192/* 2193 * Record logout in wtmp file and exit with supplied status. 2194 * NOTE: because this is called from signal handlers it cannot 2195 * use stdio (or call other functions that use stdio). 2196 */ 2197void 2198dologout(int status) 2199{ 2200 2201 transflag = 0; 2202 2203 if (logged_in) { 2204 sigprocmask(SIG_BLOCK, &allsigs, NULL); 2205 if (!nowtmp) 2206 ftpdlogwtmp(ttyline, "", ""); 2207 if (doutmp) 2208 ftpd_logout(utmp.ut_line); 2209 } 2210 /* beware of flushing buffers after a SIGPIPE */ 2211 _exit(status); 2212} 2213 2214/*ARGSUSED*/ 2215static void 2216sigurg(int signo) 2217{ 2218 2219 recvurg = 1; 2220} 2221 2222static void 2223myoob(void) 2224{ 2225 char *cp; 2226 int ret; 2227 2228 /* only process if transfer occurring */ 2229 if (!transflag) 2230 return; 2231 cp = tmpline; 2232 ret = get_line(cp, sizeof(tmpline)-1, stdin); 2233 if (ret == -1) { 2234 reply(221, "You could at least say goodbye."); 2235 dologout(0); 2236 } else if (ret == -2) { 2237 /* Ignore truncated command */ 2238 return; 2239 } 2240 upper(cp); 2241 if (strcmp(cp, "ABOR\r\n") == 0) { 2242 tmpline[0] = '\0'; 2243 reply(426, "Transfer aborted. Data connection closed."); 2244 reply(226, "Abort successful"); 2245 } 2246 if (strcmp(cp, "STAT\r\n") == 0) { 2247 tmpline[0] = '\0'; 2248 if (file_size != (off_t) -1) 2249 reply(213, "Status: %qd of %qd bytes transferred", 2250 byte_count, file_size); 2251 else 2252 reply(213, "Status: %qd bytes transferred", byte_count); 2253 } 2254} 2255 2256/* 2257 * Note: a response of 425 is not mentioned as a possible response to 2258 * the PASV command in RFC959. However, it has been blessed as 2259 * a legitimate response by Jon Postel in a telephone conversation 2260 * with Rick Adams on 25 Jan 89. 2261 */ 2262void 2263passive(void) 2264{ 2265 socklen_t len; 2266 int on = 1; 2267 u_char *p, *a; 2268 2269 if (pw == NULL) { 2270 reply(530, "Please login with USER and PASS"); 2271 return; 2272 } 2273 if (pdata >= 0) 2274 close(pdata); 2275 /* 2276 * XXX 2277 * At this point, it would be nice to have an algorithm that 2278 * inserted a growing delay in an attack scenario. Such a thing 2279 * would look like continual passive sockets being opened, but 2280 * nothing serious being done with them. They're not used to 2281 * move data; the entire attempt is just to use tcp FIN_WAIT 2282 * resources. 2283 */ 2284 pdata = socket(AF_INET, SOCK_STREAM, 0); 2285 if (pdata < 0) { 2286 perror_reply(425, "Can't open passive connection"); 2287 return; 2288 } 2289 2290 if (setsockopt(pdata, SOL_SOCKET, SO_KEEPALIVE, 2291 &on, sizeof(on)) < 0) 2292 goto pasv_error; 2293 2294 on = IP_PORTRANGE_HIGH; 2295 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2296 &on, sizeof(on)) < 0) 2297 goto pasv_error; 2298 2299 pasv_addr = ctrl_addr; 2300 pasv_addr.su_sin.sin_port = 0; 2301 if (bind(pdata, (struct sockaddr *)&pasv_addr, 2302 pasv_addr.su_len) < 0) 2303 goto pasv_error; 2304 2305 len = sizeof(pasv_addr); 2306 if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) < 0) 2307 goto pasv_error; 2308 if (listen(pdata, 1) < 0) 2309 goto pasv_error; 2310 a = (u_char *)&pasv_addr.su_sin.sin_addr; 2311 p = (u_char *)&pasv_addr.su_sin.sin_port; 2312 2313 reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0], 2314 a[1], a[2], a[3], p[0], p[1]); 2315 return; 2316 2317pasv_error: 2318 perror_reply(425, "Can't open passive connection"); 2319 (void) close(pdata); 2320 pdata = -1; 2321 return; 2322} 2323 2324int 2325epsvproto2af(int proto) 2326{ 2327 2328 switch (proto) { 2329 case 1: return AF_INET; 2330#ifdef INET6 2331 case 2: return AF_INET6; 2332#endif 2333 default: return -1; 2334 } 2335} 2336 2337int 2338af2epsvproto(int af) 2339{ 2340 2341 switch (af) { 2342 case AF_INET: return 1; 2343#ifdef INET6 2344 case AF_INET6: return 2; 2345#endif 2346 default: return -1; 2347 } 2348} 2349 2350/* 2351 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2352 * 229 Entering Extended Passive Mode (|||port|) 2353 */ 2354void 2355long_passive(char *cmd, int pf) 2356{ 2357 socklen_t len; 2358 int on = 1; 2359 u_char *p, *a; 2360 2361 if (!logged_in) { 2362 syslog(LOG_NOTICE, "long passive but not logged in"); 2363 reply(503, "Login with USER first."); 2364 return; 2365 } 2366 2367 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2368 /* 2369 * XXX 2370 * only EPRT/EPSV ready clients will understand this 2371 */ 2372 if (strcmp(cmd, "EPSV") != 0) 2373 reply(501, "Network protocol mismatch"); /*XXX*/ 2374 else 2375 epsv_protounsupp("Network protocol mismatch"); 2376 2377 return; 2378 } 2379 2380 if (pdata >= 0) 2381 close(pdata); 2382 /* 2383 * XXX 2384 * At this point, it would be nice to have an algorithm that 2385 * inserted a growing delay in an attack scenario. Such a thing 2386 * would look like continual passive sockets being opened, but 2387 * nothing serious being done with them. They not used to move 2388 * data; the entire attempt is just to use tcp FIN_WAIT 2389 * resources. 2390 */ 2391 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2392 if (pdata < 0) { 2393 perror_reply(425, "Can't open passive connection"); 2394 return; 2395 } 2396 2397 if (setsockopt(pdata, SOL_SOCKET, SO_KEEPALIVE, 2398 &on, sizeof(on)) < 0) 2399 goto pasv_error; 2400 2401 switch (ctrl_addr.su_family) { 2402 case AF_INET: 2403 on = IP_PORTRANGE_HIGH; 2404 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2405 &on, sizeof(on)) < 0) 2406 goto pasv_error; 2407 break; 2408 case AF_INET6: 2409 on = IPV6_PORTRANGE_HIGH; 2410 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2411 &on, sizeof(on)) < 0) 2412 goto pasv_error; 2413 break; 2414 } 2415 2416 pasv_addr = ctrl_addr; 2417 pasv_addr.su_port = 0; 2418 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2419 goto pasv_error; 2420 len = pasv_addr.su_len; 2421 if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) < 0) 2422 goto pasv_error; 2423 if (listen(pdata, 1) < 0) 2424 goto pasv_error; 2425 p = (u_char *)&pasv_addr.su_port; 2426 2427 if (strcmp(cmd, "LPSV") == 0) { 2428 switch (pasv_addr.su_family) { 2429 case AF_INET: 2430 a = (u_char *)&pasv_addr.su_sin.sin_addr; 2431 reply(228, 2432 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2433 4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]); 2434 return; 2435 case AF_INET6: 2436 a = (u_char *)&pasv_addr.su_sin6.sin6_addr; 2437 reply(228, 2438 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u," 2439 "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2440 6, 16, a[0], a[1], a[2], a[3], a[4], 2441 a[5], a[6], a[7], a[8], a[9], a[10], 2442 a[11], a[12], a[13], a[14], a[15], 2443 2, p[0], p[1]); 2444 return; 2445 } 2446 } else if (strcmp(cmd, "EPSV") == 0) { 2447 switch (pasv_addr.su_family) { 2448 case AF_INET: 2449 case AF_INET6: 2450 reply(229, "Entering Extended Passive Mode (|||%u|)", 2451 ntohs(pasv_addr.su_port)); 2452 return; 2453 } 2454 } else { 2455 /* more proper error code? */ 2456 } 2457 2458 pasv_error: 2459 perror_reply(425, "Can't open passive connection"); 2460 (void) close(pdata); 2461 pdata = -1; 2462 return; 2463} 2464 2465/* 2466 * EPRT |proto|addr|port| 2467 */ 2468int 2469extended_port(const char *arg) 2470{ 2471 char *tmp = NULL; 2472 char *result[3]; 2473 char *p, *q; 2474 char delim; 2475 struct addrinfo hints; 2476 struct addrinfo *res = NULL; 2477 int i; 2478 unsigned long proto; 2479 2480 if (epsvall) { 2481 reply(501, "EPRT disallowed after EPSV ALL"); 2482 return -1; 2483 } 2484 2485 usedefault = 0; 2486 if (pdata >= 0) { 2487 (void) close(pdata); 2488 pdata = -1; 2489 } 2490 2491 tmp = strdup(arg); 2492 if (!tmp) { 2493 fatal("not enough core."); 2494 /*NOTREACHED*/ 2495 } 2496 p = tmp; 2497 delim = p[0]; 2498 p++; 2499 memset(result, 0, sizeof(result)); 2500 for (i = 0; i < 3; i++) { 2501 q = strchr(p, delim); 2502 if (!q || *q != delim) 2503 goto parsefail; 2504 *q++ = '\0'; 2505 result[i] = p; 2506 p = q; 2507 } 2508 2509 /* some more sanity check */ 2510 p = NULL; 2511 (void)strtoul(result[2], &p, 10); 2512 if (!*result[2] || *p) 2513 goto protounsupp; 2514 p = NULL; 2515 proto = strtoul(result[0], &p, 10); 2516 if (!*result[0] || *p) 2517 goto protounsupp; 2518 2519 memset(&hints, 0, sizeof(hints)); 2520 hints.ai_family = epsvproto2af((int)proto); 2521 if (hints.ai_family < 0) 2522 goto protounsupp; 2523 hints.ai_socktype = SOCK_STREAM; 2524 hints.ai_flags = AI_NUMERICHOST; /*no DNS*/ 2525 if (getaddrinfo(result[1], result[2], &hints, &res)) 2526 goto parsefail; 2527 if (res->ai_next) 2528 goto parsefail; 2529 if (sizeof(data_dest) < res->ai_addrlen) 2530 goto parsefail; 2531 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2532 if (his_addr.su_family == AF_INET6 && 2533 data_dest.su_family == AF_INET6) { 2534 /* XXX more sanity checks! */ 2535 data_dest.su_sin6.sin6_scope_id = 2536 his_addr.su_sin6.sin6_scope_id; 2537 } 2538 if (pdata >= 0) { 2539 (void) close(pdata); 2540 pdata = -1; 2541 } 2542 reply(200, "EPRT command successful."); 2543 2544 if (tmp) 2545 free(tmp); 2546 if (res) 2547 freeaddrinfo(res); 2548 return 0; 2549 2550parsefail: 2551 reply(500, "Invalid argument, rejected."); 2552 usedefault = 1; 2553 if (tmp) 2554 free(tmp); 2555 if (res) 2556 freeaddrinfo(res); 2557 return -1; 2558 2559protounsupp: 2560 epsv_protounsupp("Protocol not supported"); 2561 usedefault = 1; 2562 if (tmp) 2563 free(tmp); 2564 if (res) 2565 freeaddrinfo(res); 2566 return -1; 2567} 2568 2569/* 2570 * 522 Protocol not supported (proto,...) 2571 * as we assume address family for control and data connections are the same, 2572 * we do not return the list of address families we support - instead, we 2573 * return the address family of the control connection. 2574 */ 2575void 2576epsv_protounsupp(const char *message) 2577{ 2578 int proto; 2579 2580 proto = af2epsvproto(ctrl_addr.su_family); 2581 if (proto < 0) 2582 reply(501, "%s", message); /*XXX*/ 2583 else 2584 reply(522, "%s, use (%d)", message, proto); 2585} 2586 2587/* 2588 * Generate unique name for file with basename "local". 2589 * The file named "local" is already known to exist. 2590 * Generates failure reply on error. 2591 */ 2592static int 2593guniquefd(char *local, char **nam) 2594{ 2595 static char new[PATH_MAX]; 2596 struct stat st; 2597 int count, len, fd; 2598 char *cp; 2599 2600 cp = strrchr(local, '/'); 2601 if (cp) 2602 *cp = '\0'; 2603 if (stat(cp ? local : ".", &st) < 0) { 2604 perror_reply(553, cp ? local : "."); 2605 return (-1); 2606 } 2607 if (cp) 2608 *cp = '/'; 2609 len = strlcpy(new, local, sizeof(new)); 2610 if (len+2+1 >= sizeof(new)-1) 2611 return (-1); 2612 cp = new + len; 2613 *cp++ = '.'; 2614 for (count = 1; count < 100; count++) { 2615 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 2616 fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666); 2617 if (fd == -1) 2618 continue; 2619 if (nam) 2620 *nam = new; 2621 return (fd); 2622 } 2623 reply(452, "Unique file name cannot be created."); 2624 return (-1); 2625} 2626 2627/* 2628 * Format and send reply containing system error number. 2629 */ 2630void 2631perror_reply(int code, char *string) 2632{ 2633 2634 reply(code, "%s: %s.", string, strerror(errno)); 2635} 2636 2637static char *onefile[] = { 2638 "", 2639 0 2640}; 2641 2642void 2643send_file_list(char *whichf) 2644{ 2645 struct stat st; 2646 DIR *dirp = NULL; 2647 struct dirent *dir; 2648 FILE *dout = NULL; 2649 char **dirlist; 2650 char *dirname; 2651 int simple = 0; 2652 volatile int freeglob = 0; 2653 glob_t gl; 2654 2655 if (strpbrk(whichf, "~{[*?") != NULL) { 2656 memset(&gl, 0, sizeof(gl)); 2657 freeglob = 1; 2658 if (glob(whichf, 2659 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, 2660 0, &gl)) { 2661 reply(550, "not found"); 2662 goto out; 2663 } else if (gl.gl_pathc == 0) { 2664 errno = ENOENT; 2665 perror_reply(550, whichf); 2666 goto out; 2667 } 2668 dirlist = gl.gl_pathv; 2669 } else { 2670 onefile[0] = whichf; 2671 dirlist = onefile; 2672 simple = 1; 2673 } 2674 2675 while ((dirname = *dirlist++)) { 2676 if (stat(dirname, &st) < 0) { 2677 /* 2678 * If user typed "ls -l", etc, and the client 2679 * used NLST, do what the user meant. 2680 */ 2681 if (dirname[0] == '-' && *dirlist == NULL && 2682 transflag == 0) { 2683 retrieve("/bin/ls %s", dirname); 2684 goto out; 2685 } 2686 perror_reply(550, whichf); 2687 if (dout != NULL) { 2688 (void) fclose(dout); 2689 transflag = 0; 2690 data = -1; 2691 pdata = -1; 2692 } 2693 goto out; 2694 } 2695 2696 if (S_ISREG(st.st_mode)) { 2697 if (dout == NULL) { 2698 dout = dataconn("file list", (off_t)-1, "w"); 2699 if (dout == NULL) 2700 goto out; 2701 transflag++; 2702 } 2703 fprintf(dout, "%s%s\n", dirname, 2704 type == TYPE_A ? "\r" : ""); 2705 byte_count += strlen(dirname) + 1; 2706 continue; 2707 } else if (!S_ISDIR(st.st_mode)) 2708 continue; 2709 2710 if ((dirp = opendir(dirname)) == NULL) 2711 continue; 2712 2713 while ((dir = readdir(dirp)) != NULL) { 2714 char nbuf[PATH_MAX]; 2715 2716 if (recvurg) { 2717 myoob(); 2718 recvurg = 0; 2719 transflag = 0; 2720 goto out; 2721 } 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), "%s/%s", dirname, 2730 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 else { 2768 if (pdata >= 0) 2769 close(pdata); 2770 } 2771 data = -1; 2772 pdata = -1; 2773out: 2774 if (freeglob) { 2775 freeglob = 0; 2776 globfree(&gl); 2777 } 2778} 2779 2780/*ARGSUSED*/ 2781static void 2782reapchild(int signo) 2783{ 2784 int save_errno = errno; 2785 int rval; 2786 2787 do { 2788 rval = waitpid(-1, NULL, WNOHANG); 2789 } while (rval > 0 || (rval == -1 && errno == EINTR)); 2790 errno = save_errno; 2791} 2792 2793void 2794logxfer(char *name, off_t size, time_t start) 2795{ 2796 char buf[400 + (HOST_NAME_MAX+1)*4 + PATH_MAX*4]; 2797 char dir[PATH_MAX], path[PATH_MAX], rpath[PATH_MAX]; 2798 char vremotehost[(HOST_NAME_MAX+1)*4], vpath[PATH_MAX*4]; 2799 char *vpw; 2800 time_t now; 2801 int len; 2802 2803 if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) { 2804 time(&now); 2805 2806 vpw = malloc(strlen(guest ? guestpw : pw->pw_name) * 4 + 1); 2807 if (vpw == NULL) 2808 return; 2809 2810 snprintf(path, sizeof(path), "%s/%s", dir, name); 2811 if (realpath(path, rpath) == NULL) 2812 strlcpy(rpath, path, sizeof(rpath)); 2813 strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH); 2814 2815 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2816 strvis(vpw, guest? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2817 2818 len = snprintf(buf, sizeof(buf), 2819 "%.24s %lld %s %qd %s %c %s %c %c %s ftp %d %s %s\n", 2820 ctime(&now), (long long)(now - start + (now == start)), 2821 vremotehost, (long long)size, vpath, 2822 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2823 'o', ((guest) ? 'a' : 'r'), 2824 vpw, 0 /* none yet */, 2825 ((guest) ? "*" : pw->pw_name), dhostname); 2826 free(vpw); 2827 2828 if (len >= sizeof(buf) || len == -1) { 2829 if ((len = strlen(buf)) == 0) 2830 return; /* should not happen */ 2831 buf[len - 1] = '\n'; 2832 } 2833 write(statfd, buf, len); 2834 } 2835} 2836 2837void 2838set_slave_signals(void) 2839{ 2840 struct sigaction sa; 2841 2842 sigemptyset(&sa.sa_mask); 2843 sa.sa_flags = SA_RESTART; 2844 2845 sa.sa_handler = SIG_DFL; 2846 (void) sigaction(SIGCHLD, &sa, NULL); 2847 2848 sa.sa_handler = sigurg; 2849 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 2850 (void) sigaction(SIGURG, &sa, NULL); 2851 2852 sigfillset(&sa.sa_mask); /* block all signals in handler */ 2853 sa.sa_flags = SA_RESTART; 2854 sa.sa_handler = sigquit; 2855 (void) sigaction(SIGHUP, &sa, NULL); 2856 (void) sigaction(SIGINT, &sa, NULL); 2857 (void) sigaction(SIGQUIT, &sa, NULL); 2858 (void) sigaction(SIGTERM, &sa, NULL); 2859 2860 sa.sa_handler = lostconn; 2861 (void) sigaction(SIGPIPE, &sa, NULL); 2862 2863 sa.sa_handler = toolong; 2864 (void) sigaction(SIGALRM, &sa, NULL); 2865 2866#ifdef F_SETOWN 2867 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 2868 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 2869#endif 2870} 2871 2872/* 2873 * Allocate space and return a copy of the specified dir. 2874 * If 'dir' begins with a tilde (~), expand it. 2875 */ 2876char * 2877copy_dir(char *dir, struct passwd *pw) 2878{ 2879 char *cp; 2880 char *newdir; 2881 char *user = NULL; 2882 2883 /* Nothing to expand */ 2884 if (dir[0] != '~') 2885 return (strdup(dir)); 2886 2887 /* "dir" is of form ~user/some/dir, lookup user. */ 2888 if (dir[1] != '/' && dir[1] != '\0') { 2889 if ((cp = strchr(dir + 1, '/')) == NULL) 2890 cp = dir + strlen(dir); 2891 if ((user = malloc((size_t)(cp - dir))) == NULL) 2892 return (NULL); 2893 strlcpy(user, dir + 1, (size_t)(cp - dir)); 2894 2895 /* Only do lookup if it is a different user. */ 2896 if (strcmp(user, pw->pw_name) != 0) { 2897 if ((pw = getpwnam(user)) == NULL) { 2898 /* No such user, interpret literally */ 2899 free(user); 2900 return(strdup(dir)); 2901 } 2902 } 2903 free(user); 2904 } 2905 2906 /* 2907 * If there is no directory separator (/) then it is just pw_dir. 2908 * Otherwise, replace ~foo with pw_dir. 2909 */ 2910 if ((cp = strchr(dir + 1, '/')) == NULL) { 2911 newdir = strdup(pw->pw_dir); 2912 } else { 2913 if (asprintf(&newdir, "%s%s", pw->pw_dir, cp) == -1) 2914 return (NULL); 2915 } 2916 2917 return(newdir); 2918} 2919