ftpd.c revision 1.212
1/* $OpenBSD: ftpd.c,v 1.212 2015/12/12 20:09:28 mmcc 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 175char proctitle[BUFSIZ]; /* initial part of title */ 176 177#define LOGCMD(cmd, file) \ 178 if (logging > 1) \ 179 syslog(LOG_INFO,"%s %s%s", cmd, \ 180 *(file) == '/' ? "" : curdir(), file); 181#define LOGCMD2(cmd, file1, file2) \ 182 if (logging > 1) \ 183 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 184 *(file1) == '/' ? "" : curdir(), file1, \ 185 *(file2) == '/' ? "" : curdir(), file2); 186#define LOGBYTES(cmd, file, cnt) \ 187 if (logging > 1) { \ 188 if (cnt == (off_t)-1) \ 189 syslog(LOG_INFO,"%s %s%s", cmd, \ 190 *(file) == '/' ? "" : curdir(), file); \ 191 else \ 192 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 193 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 194 } 195 196static void ack(char *); 197static void sigurg(int); 198static void myoob(void); 199static int checkuser(char *, char *); 200static FILE *dataconn(char *, off_t, char *); 201static void dolog(struct sockaddr *); 202static char *copy_dir(char *, struct passwd *); 203static char *curdir(void); 204static void end_login(void); 205static FILE *getdatasock(char *); 206static int guniquefd(char *, char **); 207static void lostconn(int); 208static void sigquit(int); 209static int receive_data(FILE *, FILE *); 210static void replydirname(const char *, const char *); 211static int send_data(FILE *, FILE *, off_t, off_t, int); 212static struct passwd * 213 sgetpwnam(char *, struct passwd *); 214static void reapchild(int); 215static void usage(void); 216 217void logxfer(char *, off_t, time_t); 218void set_slave_signals(void); 219 220static char * 221curdir(void) 222{ 223 static char path[PATH_MAX+1]; /* path + '/' */ 224 225 if (getcwd(path, sizeof(path)-1) == NULL) 226 return (""); 227 if (path[1] != '\0') /* special case for root dir. */ 228 strlcat(path, "/", sizeof path); 229 /* For guest account, skip / since it's chrooted */ 230 return (guest ? path+1 : path); 231} 232 233char *argstr = "AdDhnlm:MSt:T:u:PUvW46"; 234 235static void 236usage(void) 237{ 238 syslog(LOG_ERR, 239 "usage: ftpd [-46ADdlMnPSUW] [-m minuid] [-T maxtimeout] " 240 "[-t timeout] [-u mask]"); 241 exit(2); 242} 243 244int 245main(int argc, char *argv[]) 246{ 247 socklen_t addrlen; 248 int ch, on = 1, tos; 249 char line[LINE_MAX]; 250 FILE *fp; 251 struct hostent *hp; 252 struct sigaction sa; 253 int error = 0; 254 const char *errstr; 255 256 tzset(); /* in case no timezone database in ~ftp */ 257 sigfillset(&allsigs); /* used to block signals while root */ 258 sigemptyset(&sa.sa_mask); 259 sa.sa_flags = SA_RESTART; 260 261 while ((ch = getopt(argc, argv, argstr)) != -1) { 262 switch (ch) { 263 case 'A': 264 anon_only = 1; 265 break; 266 267 case 'd': 268 case 'v': /* deprecated */ 269 debug = 1; 270 break; 271 272 case 'D': 273 daemon_mode = 1; 274 break; 275 276 case 'P': 277 portcheck = 0; 278 break; 279 280 case 'h': /* deprecated */ 281 break; 282 283 case 'l': 284 logging++; /* > 1 == extra logging */ 285 break; 286 287 case 'm': 288 minuid = strtonum(optarg, 0, UINT_MAX, &errstr); 289 if (errstr) { 290 syslog(LOG_ERR, 291 "%s is a bad value for -m, aborting", 292 optarg); 293 exit(2); 294 } 295 break; 296 297 case 'M': 298 multihome = 1; 299 break; 300 301 case 'n': 302 anon_ok = 0; 303 break; 304 305 case 'S': 306 stats = 1; 307 break; 308 309 case 't': 310 timeout = strtonum(optarg, 0, INT_MAX, &errstr); 311 if (errstr) { 312 syslog(LOG_ERR, 313 "%s is a bad value for -t, aborting", 314 optarg); 315 exit(2); 316 } 317 if (maxtimeout < timeout) 318 maxtimeout = timeout; 319 break; 320 321 case 'T': 322 maxtimeout = strtonum(optarg, 0, INT_MAX, 323 &errstr); 324 if (errstr) { 325 syslog(LOG_ERR, 326 "%s is a bad value for -T, aborting", 327 optarg); 328 exit(2); 329 } 330 if (timeout > maxtimeout) 331 timeout = maxtimeout; 332 break; 333 334 case 'u': 335 { 336 long val = 0; 337 char *p; 338 umaskchange = 0; 339 340 val = strtol(optarg, &p, 8); 341 if (*optarg == '\0' || *p != '\0' || val < 0 || 342 (val & ~ACCESSPERMS)) { 343 syslog(LOG_ERR, 344 "%s is a bad value for -u, aborting", 345 optarg); 346 exit(2); 347 } 348 defumask = val; 349 break; 350 } 351 352 case 'U': 353 doutmp = 1; 354 break; 355 356 case 'W': 357 nowtmp = 1; 358 break; 359 360 case '4': 361 family = AF_INET; 362 break; 363 364 case '6': 365 family = AF_INET6; 366 break; 367 368 default: 369 usage(); 370 break; 371 } 372 } 373 374 if (nowtmp && doutmp) { 375 syslog(LOG_ERR, "options 'U' and 'W' are mutually exclusive"); 376 exit(1); 377 } 378 379 (void) freopen(_PATH_DEVNULL, "w", stderr); 380 381 /* 382 * LOG_NDELAY sets up the logging connection immediately, 383 * necessary for anonymous ftp's that chroot and can't do it later. 384 */ 385 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 386 387 if (getpwnam(FTPD_PRIVSEP_USER) == NULL) { 388 syslog(LOG_ERR, "privilege separation user %s not found", 389 FTPD_PRIVSEP_USER); 390 exit(1); 391 } 392 endpwent(); 393 394 if (daemon_mode) { 395 int *fds, i, fd; 396 struct pollfd *pfds; 397 struct addrinfo hints, *res, *res0; 398 nfds_t n; 399 400 /* 401 * Detach from parent. 402 */ 403 if (daemon(1, 1) < 0) { 404 syslog(LOG_ERR, "failed to become a daemon"); 405 exit(1); 406 } 407 sa.sa_handler = reapchild; 408 (void) sigaction(SIGCHLD, &sa, NULL); 409 410 memset(&hints, 0, sizeof(hints)); 411 hints.ai_family = family; 412 hints.ai_socktype = SOCK_STREAM; 413 hints.ai_protocol = IPPROTO_TCP; 414 hints.ai_flags = AI_PASSIVE; 415 error = getaddrinfo(NULL, "ftp", &hints, &res0); 416 if (error) { 417 syslog(LOG_ERR, "%s", gai_strerror(error)); 418 exit(1); 419 } 420 421 n = 0; 422 for (res = res0; res; res = res->ai_next) 423 n++; 424 425 fds = calloc(n, sizeof(int)); 426 pfds = calloc(n, sizeof(struct pollfd)); 427 if (!fds || !pfds) { 428 syslog(LOG_ERR, "%s", strerror(errno)); 429 exit(1); 430 } 431 432 /* 433 * Open sockets, bind it to the FTP port, and start 434 * listening. 435 */ 436 n = 0; 437 for (res = res0; res; res = res->ai_next) { 438 fds[n] = socket(res->ai_family, res->ai_socktype, 439 res->ai_protocol); 440 if (fds[n] < 0) 441 continue; 442 443 if (setsockopt(fds[n], SOL_SOCKET, SO_KEEPALIVE, 444 &on, sizeof(on)) < 0) { 445 close(fds[n]); 446 fds[n] = -1; 447 continue; 448 } 449 450 if (setsockopt(fds[n], SOL_SOCKET, SO_REUSEADDR, 451 &on, sizeof(on)) < 0) { 452 close(fds[n]); 453 fds[n] = -1; 454 continue; 455 } 456 457 if (bind(fds[n], res->ai_addr, res->ai_addrlen) < 0) { 458 close(fds[n]); 459 fds[n] = -1; 460 continue; 461 } 462 if (listen(fds[n], 32) < 0) { 463 close(fds[n]); 464 fds[n] = -1; 465 continue; 466 } 467 468 pfds[n].fd = fds[n]; 469 pfds[n].events = POLLIN; 470 n++; 471 } 472 freeaddrinfo(res0); 473 474 if (n == 0) { 475 syslog(LOG_ERR, "could not open control socket"); 476 exit(1); 477 } 478 479 /* 480 * Loop forever accepting connection requests and forking off 481 * children to handle them. 482 */ 483 while (1) { 484 if (poll(pfds, n, INFTIM) < 0) { 485 if (errno == EINTR) 486 continue; 487 syslog(LOG_ERR, "poll: %m"); 488 exit(1); 489 } 490 for (i = 0; i < n; i++) 491 if (pfds[i].revents & POLLIN) { 492 addrlen = sizeof(his_addr); 493 fd = accept(pfds[i].fd, 494 (struct sockaddr *)&his_addr, 495 &addrlen); 496 if (fd != -1) { 497 if (fork() == 0) 498 goto child; 499 close(fd); 500 } 501 } 502 } 503 504 child: 505 /* child */ 506 (void)dup2(fd, STDIN_FILENO); 507 (void)dup2(fd, STDOUT_FILENO); 508 for (i = 0; i < n; i++) 509 close(fds[i]); 510 } else { 511 addrlen = sizeof(his_addr); 512 if (getpeername(0, (struct sockaddr *)&his_addr, 513 &addrlen) < 0) { 514 /* syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); */ 515 exit(1); 516 } 517 } 518 519 /* set this here so klogin can use it... */ 520 (void)snprintf(ttyline, sizeof(ttyline), "ftp%ld", (long)getpid()); 521 522 set_slave_signals(); 523 524 addrlen = sizeof(ctrl_addr); 525 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 526 syslog(LOG_ERR, "getsockname: %m"); 527 exit(1); 528 } 529 if (his_addr.su_family == AF_INET6 && 530 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 531#if 1 532 /* 533 * IPv4 control connection arrived to AF_INET6 socket. 534 * I hate to do this, but this is the easiest solution. 535 */ 536 union sockunion tmp_addr; 537 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 538 539 tmp_addr = his_addr; 540 memset(&his_addr, 0, sizeof(his_addr)); 541 his_addr.su_sin.sin_family = AF_INET; 542 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 543 memcpy(&his_addr.su_sin.sin_addr, 544 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 545 sizeof(his_addr.su_sin.sin_addr)); 546 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 547 548 tmp_addr = ctrl_addr; 549 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 550 ctrl_addr.su_sin.sin_family = AF_INET; 551 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 552 memcpy(&ctrl_addr.su_sin.sin_addr, 553 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 554 sizeof(ctrl_addr.su_sin.sin_addr)); 555 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 556#else 557 while (fgets(line, sizeof(line), fd) != NULL) { 558 line[strcspn(line, "\n")] = '\0'; 559 lreply(530, "%s", line); 560 } 561 (void) fflush(stdout); 562 (void) close(fd); 563 reply(530, 564 "Connection from IPv4 mapped address is not supported."); 565 exit(0); 566#endif 567 } 568#ifdef IP_TOS 569 if (his_addr.su_family == AF_INET) { 570 tos = IPTOS_LOWDELAY; 571 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, 572 sizeof(int)) < 0) 573 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 574 } 575#endif 576 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 577 578 /* Try to handle urgent data inline */ 579#ifdef SO_OOBINLINE 580 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 581 syslog(LOG_ERR, "setsockopt: %m"); 582#endif 583 584 dolog((struct sockaddr *)&his_addr); 585 586 /* 587 * Set up default state 588 */ 589 data = -1; 590 type = TYPE_A; 591 form = FORM_N; 592 stru = STRU_F; 593 mode = MODE_S; 594 tmpline[0] = '\0'; 595 596 /* If logins are disabled, print out the message. */ 597 if ((fp = fopen(_PATH_NOLOGIN, "r")) != NULL) { 598 while (fgets(line, sizeof(line), fp) != NULL) { 599 line[strcspn(line, "\n")] = '\0'; 600 lreply(530, "%s", line); 601 } 602 (void) fflush(stdout); 603 (void) fclose(fp); 604 reply(530, "System not available."); 605 exit(0); 606 } 607 if ((fp = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 608 while (fgets(line, sizeof(line), fp) != NULL) { 609 line[strcspn(line, "\n")] = '\0'; 610 lreply(220, "%s", line); 611 } 612 (void) fflush(stdout); 613 (void) fclose(fp); 614 /* reply(220,) must follow */ 615 } 616 (void) gethostname(hostname, sizeof(hostname)); 617 618 /* Make sure hostname is fully qualified. */ 619 hp = gethostbyname(hostname); 620 if (hp != NULL) 621 strlcpy(hostname, hp->h_name, sizeof(hostname)); 622 623 if (multihome) { 624 error = getnameinfo((struct sockaddr *)&ctrl_addr, 625 ctrl_addr.su_len, dhostname, sizeof(dhostname), NULL, 0, 0); 626 } 627 628 if (error != 0) 629 reply(220, "FTP server ready."); 630 else 631 reply(220, "%s FTP server ready.", 632 (multihome ? dhostname : hostname)); 633 634 monitor_init(); 635 636 for (;;) 637 (void) yyparse(); 638 /* NOTREACHED */ 639} 640 641/* 642 * Signal handlers. 643 */ 644/*ARGSUSED*/ 645static void 646lostconn(int signo) 647{ 648 struct syslog_data sdata = SYSLOG_DATA_INIT; 649 650 sdata.log_fac = LOG_FTP; 651 if (debug) 652 syslog_r(LOG_DEBUG, &sdata, "lost connection"); 653 dologout(1); 654} 655 656static void 657sigquit(int signo) 658{ 659 struct syslog_data sdata = SYSLOG_DATA_INIT; 660 661 sdata.log_fac = LOG_FTP; 662 syslog_r(LOG_DEBUG, &sdata, "got signal %s", sys_signame[signo]); 663 dologout(1); 664} 665 666/* 667 * Save the result of a getpwnam. Used for USER command, since 668 * the data returned must not be clobbered by any other command 669 * (e.g., globbing). 670 */ 671static struct passwd * 672sgetpwnam(char *name, struct passwd *pw) 673{ 674 static struct passwd *save; 675 struct passwd *old; 676 677 if (pw == NULL && (pw = getpwnam(name)) == NULL) 678 return (NULL); 679 old = save; 680 save = pw_dup(pw); 681 if (save == NULL) { 682 perror_reply(421, "Local resource failure: malloc"); 683 dologout(1); 684 /* NOTREACHED */ 685 } 686 if (old) { 687 explicit_bzero(old->pw_passwd, strlen(old->pw_passwd)); 688 free(old); 689 } 690 return (save); 691} 692 693static int login_attempts; /* number of failed login attempts */ 694static int askpasswd; /* had user command, ask for passwd */ 695static char curname[LOGIN_NAME_MAX]; /* current USER name */ 696 697/* 698 * USER command. 699 * Sets global passwd pointer pw if named account exists and is acceptable; 700 * sets askpasswd if a PASS command is expected. If logged in previously, 701 * need to reset state. If name is "ftp" or "anonymous", the name is not in 702 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 703 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 704 * requesting login privileges. Disallow anyone who does not have a standard 705 * shell as returned by getusershell(). Disallow anyone mentioned in the file 706 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 707 */ 708void 709user(char *name) 710{ 711 char *cp, *shell, *style, *host; 712 char *class = NULL; 713 714 if (logged_in) { 715 kill_slave("user already logged in"); 716 end_login(); 717 } 718 719 /* Close session from previous user if there was one. */ 720 if (as) { 721 auth_close(as); 722 as = NULL; 723 } 724 if (lc) { 725 login_close(lc); 726 lc = NULL; 727 } 728 729 if ((style = strchr(name, ':')) != NULL) 730 *style++ = 0; 731 732 guest = 0; 733 askpasswd = 0; 734 host = multihome ? dhostname : hostname; 735 if (anon_ok && 736 (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0)) { 737 if (checkuser(_PATH_FTPUSERS, "ftp") || 738 checkuser(_PATH_FTPUSERS, "anonymous")) 739 reply(530, "User %s access denied.", name); 740 else if ((pw = sgetpwnam("ftp", NULL)) != NULL) { 741 if ((lc = login_getclass(pw->pw_class)) == NULL || 742 (as = auth_open()) == NULL || 743 auth_setpwd(as, pw) != 0 || 744 auth_setoption(as, "FTPD_HOST", host) < 0) { 745 if (as) { 746 auth_close(as); 747 as = NULL; 748 } 749 if (lc) { 750 login_close(lc); 751 lc = NULL; 752 } 753 reply(421, "Local resource failure"); 754 return; 755 } 756 guest = 1; 757 askpasswd = 1; 758 reply(331, 759 "Guest login ok, send your email address as password."); 760 } else 761 reply(530, "User %s unknown.", name); 762 if (!askpasswd && logging) 763 syslog(LOG_NOTICE, 764 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 765 return; 766 } 767 768 shell = _PATH_BSHELL; 769 if ((pw = sgetpwnam(name, NULL))) { 770 class = pw->pw_class; 771 if (pw->pw_shell != NULL && *pw->pw_shell != '\0') 772 shell = pw->pw_shell; 773 while ((cp = getusershell()) != NULL) 774 if (strcmp(cp, shell) == 0) 775 break; 776 shell = cp; 777 endusershell(); 778 } 779 780 /* Get login class; if invalid style treat like unknown user. */ 781 lc = login_getclass(class); 782 if (lc && (style = login_getstyle(lc, style, "auth-ftp")) == NULL) { 783 login_close(lc); 784 lc = NULL; 785 pw = NULL; 786 } 787 788 /* Do pre-authentication setup. */ 789 if (lc && ((as = auth_open()) == NULL || 790 (pw != NULL && auth_setpwd(as, pw) != 0) || 791 auth_setitem(as, AUTHV_STYLE, style) < 0 || 792 auth_setitem(as, AUTHV_NAME, name) < 0 || 793 auth_setitem(as, AUTHV_CLASS, class) < 0 || 794 auth_setoption(as, "login", "yes") < 0 || 795 auth_setoption(as, "notickets", "yes") < 0 || 796 auth_setoption(as, "FTPD_HOST", host) < 0)) { 797 if (as) { 798 auth_close(as); 799 as = NULL; 800 } 801 login_close(lc); 802 lc = NULL; 803 reply(421, "Local resource failure"); 804 return; 805 } 806 if (logging) 807 strlcpy(curname, name, sizeof(curname)); 808 809 dochroot = (lc && login_getcapbool(lc, "ftp-chroot", 0)) || 810 checkuser(_PATH_FTPCHROOT, name); 811 if (anon_only && !dochroot) { 812 reply(530, "User %s access denied.", name); 813 return; 814 } 815 if (pw) { 816 if (pw->pw_uid < minuid) { 817 reply(530, "User %s access denied.", name); 818 if (logging) 819 syslog(LOG_NOTICE, 820 "FTP LOGIN REFUSED FROM %s, %s (UID))", 821 remotehost, name); 822 return; 823 } 824 if ((!shell && !dochroot) || checkuser(_PATH_FTPUSERS, name)) { 825 reply(530, "User %s access denied.", name); 826 if (logging) 827 syslog(LOG_NOTICE, 828 "FTP LOGIN REFUSED FROM %s, %s", 829 remotehost, name); 830 pw = NULL; 831 return; 832 } 833 } 834 835 if (as != NULL && (cp = auth_challenge(as)) != NULL) 836 reply(331, "%s", cp); 837 else 838 reply(331, "Password required for %s.", name); 839 840 askpasswd = 1; 841 /* 842 * Delay before reading passwd after first failed 843 * attempt to slow down passwd-guessing programs. 844 */ 845 if (login_attempts) 846 sleep((unsigned) login_attempts); 847} 848 849/* 850 * Check if a user is in the file "fname" 851 */ 852static int 853checkuser(char *fname, char *name) 854{ 855 FILE *fp; 856 int found = 0; 857 char *p, line[BUFSIZ]; 858 859 if ((fp = fopen(fname, "r")) != NULL) { 860 while (fgets(line, sizeof(line), fp) != NULL) 861 if ((p = strchr(line, '\n')) != NULL) { 862 *p = '\0'; 863 if (line[0] == '#') 864 continue; 865 if (strcmp(line, name) == 0) { 866 found = 1; 867 break; 868 } 869 } 870 (void) fclose(fp); 871 } 872 return (found); 873} 874 875/* 876 * Terminate login as previous user, if any, resetting state; 877 * used when USER command is given or login fails. 878 */ 879static void 880end_login(void) 881{ 882 sigprocmask (SIG_BLOCK, &allsigs, NULL); 883 if (logged_in) { 884 if (!nowtmp) 885 ftpdlogwtmp(ttyline, "", ""); 886 if (doutmp) 887 ftpd_logout(utmp.ut_line); 888 } 889 reply(530, "Please reconnect to work as another user"); 890 _exit(0); 891} 892 893enum auth_ret 894pass(char *passwd) 895{ 896 int authok; 897 unsigned int flags; 898 FILE *fp; 899 static char homedir[PATH_MAX]; 900 char *motd, *dir, rootdir[PATH_MAX]; 901 size_t sz_pw_dir; 902 903 if (logged_in || askpasswd == 0) { 904 reply(503, "Login with USER first."); 905 return (AUTH_FAILED); 906 } 907 askpasswd = 0; 908 if (!guest) { /* "ftp" is only account allowed no password */ 909 authok = 0; 910 if (pw == NULL || pw->pw_passwd[0] == '\0') { 911 useconds_t us; 912 913 /* Sleep between 1 and 3 seconds to emulate a crypt. */ 914 us = arc4random_uniform(3000000); 915 usleep(us); 916 if (as != NULL) { 917 auth_close(as); 918 as = NULL; 919 } 920 } else { 921 authok = auth_userresponse(as, passwd, 0); 922 as = NULL; 923 } 924 if (authok == 0) { 925 reply(530, "Login incorrect."); 926 if (logging) 927 syslog(LOG_NOTICE, 928 "FTP LOGIN FAILED FROM %s, %s", 929 remotehost, curname); 930 pw = NULL; 931 if (login_attempts++ >= 5) { 932 syslog(LOG_NOTICE, 933 "repeated login failures from %s", 934 remotehost); 935 kill_slave("repeated login failures"); 936 _exit(0); 937 } 938 return (AUTH_FAILED); 939 } 940 } else if (lc != NULL) { 941 /* Save anonymous' password. */ 942 free(guestpw); 943 guestpw = strdup(passwd); 944 if (guestpw == NULL) { 945 kill_slave("out of mem"); 946 fatal("Out of memory."); 947 } 948 949 authok = auth_approval(as, lc, pw->pw_name, "ftp"); 950 auth_close(as); 951 as = NULL; 952 if (authok == 0) { 953 syslog(LOG_INFO|LOG_AUTH, 954 "FTP LOGIN FAILED (HOST) as %s: approval failure.", 955 pw->pw_name); 956 reply(530, "Approval failure."); 957 kill_slave("approval failure"); 958 _exit(0); 959 } 960 } else { 961 syslog(LOG_INFO|LOG_AUTH, 962 "FTP LOGIN CLASS %s MISSING for %s: approval failure.", 963 pw->pw_class, pw->pw_name); 964 reply(530, "Permission denied."); 965 kill_slave("permission denied"); 966 _exit(0); 967 } 968 969 if (monitor_post_auth() == 1) { 970 /* Post-auth monitor process */ 971 logged_in = 1; 972 return (AUTH_MONITOR); 973 } 974 975 login_attempts = 0; /* this time successful */ 976 /* set umask via setusercontext() unless -u flag was given. */ 977 flags = LOGIN_SETGROUP|LOGIN_SETPRIORITY|LOGIN_SETRESOURCES; 978 if (umaskchange) 979 flags |= LOGIN_SETUMASK; 980 else 981 (void) umask(defumask); 982 if (setusercontext(lc, pw, (uid_t)0, flags) != 0) { 983 perror_reply(421, "Local resource failure: setusercontext"); 984 syslog(LOG_NOTICE, "setusercontext: %m"); 985 dologout(1); 986 /* NOTREACHED */ 987 } 988 989 /* open wtmp before chroot */ 990 if (!nowtmp) 991 ftpdlogwtmp(ttyline, pw->pw_name, remotehost); 992 993 /* open utmp before chroot */ 994 if (doutmp) { 995 memset((void *)&utmp, 0, sizeof(utmp)); 996 (void)time(&utmp.ut_time); 997 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 998 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 999 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 1000 ftpd_login(&utmp); 1001 } 1002 1003 /* open stats file before chroot */ 1004 if (guest && (stats == 1) && (statfd < 0)) 1005 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1006 stats = 0; 1007 1008 logged_in = 1; 1009 1010 if ((dir = login_getcapstr(lc, "ftp-dir", NULL, NULL))) { 1011 char *newdir; 1012 1013 newdir = copy_dir(dir, pw); 1014 if (newdir == NULL) { 1015 perror_reply(421, "Local resource failure: malloc"); 1016 dologout(1); 1017 /* NOTREACHED */ 1018 } 1019 pw->pw_dir = newdir; 1020 pw = sgetpwnam(NULL, pw); 1021 free(dir); 1022 free(newdir); 1023 } 1024 1025 /* make sure pw->pw_dir is big enough to hold "/" */ 1026 sz_pw_dir = strlen(pw->pw_dir) + 1; 1027 if (sz_pw_dir < 2) { 1028 pw->pw_dir = "/"; 1029 pw = sgetpwnam(NULL, pw); 1030 sz_pw_dir = 2; 1031 } 1032 1033 if (guest || dochroot) { 1034 if (multihome && guest) { 1035 struct stat ts; 1036 1037 /* Compute root directory. */ 1038 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1039 pw->pw_dir, dhostname); 1040 if (stat(rootdir, &ts) < 0) { 1041 snprintf(rootdir, sizeof(rootdir), "%s/%s", 1042 pw->pw_dir, hostname); 1043 } 1044 } else 1045 strlcpy(rootdir, pw->pw_dir, sizeof(rootdir)); 1046 } 1047 if (guest) { 1048 /* 1049 * We MUST do a chdir() after the chroot. Otherwise 1050 * the old current directory will be accessible as "." 1051 * outside the new root! 1052 */ 1053 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1054 reply(550, "Can't set guest privileges."); 1055 goto bad; 1056 } 1057 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1058 if (setenv("HOME", "/", 1) == -1) { 1059 reply(550, "Can't setup environment."); 1060 goto bad; 1061 } 1062 } else if (dochroot) { 1063 if (chroot(rootdir) < 0 || chdir("/") < 0) { 1064 reply(550, "Can't change root."); 1065 goto bad; 1066 } 1067 strlcpy(pw->pw_dir, "/", sz_pw_dir); 1068 if (setenv("HOME", "/", 1) == -1) { 1069 reply(550, "Can't setup environment."); 1070 goto bad; 1071 } 1072 } else if (chdir(pw->pw_dir) < 0) { 1073 if (chdir("/") < 0) { 1074 reply(530, "User %s: can't change directory to %s.", 1075 pw->pw_name, pw->pw_dir); 1076 goto bad; 1077 } else 1078 lreply(230, "No directory! Logging in with home=/"); 1079 } 1080 if (setegid(pw->pw_gid) < 0 || setgid(pw->pw_gid) < 0) { 1081 reply(550, "Can't set gid."); 1082 goto bad; 1083 } 1084 if (seteuid(pw->pw_uid) < 0 || setuid(pw->pw_uid) < 0) { 1085 reply(550, "Can't set uid."); 1086 goto bad; 1087 } 1088 sigprocmask(SIG_UNBLOCK, &allsigs, NULL); 1089 1090 /* 1091 * Set home directory so that use of ~ (tilde) works correctly. 1092 */ 1093 if (getcwd(homedir, PATH_MAX) != NULL) { 1094 if (setenv("HOME", homedir, 1) == -1) { 1095 reply(550, "Can't setup environment."); 1096 goto bad; 1097 } 1098 } 1099 1100 /* 1101 * Display a login message, if it exists. 1102 * N.B. reply(230,) must follow the message. 1103 */ 1104 motd = login_getcapstr(lc, "welcome", NULL, NULL); 1105 if ((fp = fopen(motd ? motd : _PATH_FTPLOGINMESG, "r")) != NULL) { 1106 char line[LINE_MAX]; 1107 1108 while (fgets(line, sizeof(line), fp) != NULL) { 1109 line[strcspn(line, "\n")] = '\0'; 1110 lreply(230, "%s", line); 1111 } 1112 (void) fflush(stdout); 1113 (void) fclose(fp); 1114 } 1115 free(motd); 1116 if (guest) { 1117 reply(230, "Guest login ok, access restrictions apply."); 1118 snprintf(proctitle, sizeof(proctitle), 1119 "%s: anonymous/%.*s", remotehost, 1120 (int)(sizeof(proctitle) - sizeof(remotehost) - 1121 sizeof(": anonymous/")), passwd); 1122 setproctitle("%s", proctitle); 1123 if (logging) 1124 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1125 remotehost, passwd); 1126 } else { 1127 reply(230, "User %s logged in.", pw->pw_name); 1128 snprintf(proctitle, sizeof(proctitle), 1129 "%s: %s", remotehost, pw->pw_name); 1130 setproctitle("%s", proctitle); 1131 if (logging) 1132 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1133 remotehost, pw->pw_name); 1134 } 1135 login_close(lc); 1136 lc = NULL; 1137 return (AUTH_SLAVE); 1138bad: 1139 /* Forget all about it... */ 1140 login_close(lc); 1141 lc = NULL; 1142 end_login(); 1143 return (AUTH_FAILED); 1144} 1145 1146void 1147retrieve(char *cmd, char *name) 1148{ 1149 FILE *fin, *dout; 1150 struct stat st; 1151 pid_t pid; 1152 time_t start; 1153 1154 if (cmd == 0) { 1155 fin = fopen(name, "r"); 1156 st.st_size = 0; 1157 } else { 1158 char line[BUFSIZ]; 1159 1160 (void) snprintf(line, sizeof(line), cmd, name); 1161 name = line; 1162 fin = ftpd_popen(line, "r", &pid); 1163 st.st_size = -1; 1164 st.st_blksize = BUFSIZ; 1165 } 1166 if (fin == NULL) { 1167 if (errno != 0) { 1168 perror_reply(550, name); 1169 if (cmd == 0) { 1170 LOGCMD("get", name); 1171 } 1172 } 1173 return; 1174 } 1175 byte_count = -1; 1176 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1177 reply(550, "%s: not a plain file.", name); 1178 goto done; 1179 } 1180 if (restart_point) { 1181 if (type == TYPE_A) { 1182 off_t i, n; 1183 int c; 1184 1185 n = restart_point; 1186 i = 0; 1187 while (i++ < n) { 1188 if ((c = getc(fin)) == EOF) { 1189 if (ferror(fin)) { 1190 perror_reply(550, name); 1191 goto done; 1192 } else 1193 break; 1194 } 1195 if (c == '\n') 1196 i++; 1197 } 1198 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1199 perror_reply(550, name); 1200 goto done; 1201 } 1202 } 1203 dout = dataconn(name, st.st_size, "w"); 1204 if (dout == NULL) 1205 goto done; 1206 time(&start); 1207 send_data(fin, dout, (off_t)st.st_blksize, st.st_size, 1208 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 1209 if ((cmd == 0) && stats) 1210 logxfer(name, byte_count, start); 1211 (void) fclose(dout); 1212 data = -1; 1213done: 1214 if (pdata >= 0) 1215 (void) close(pdata); 1216 pdata = -1; 1217 if (cmd == 0) { 1218 LOGBYTES("get", name, byte_count); 1219 fclose(fin); 1220 } else { 1221 ftpd_pclose(fin, pid); 1222 } 1223} 1224 1225void 1226store(char *name, char *mode, int unique) 1227{ 1228 FILE *fout, *din; 1229 int (*closefunc)(FILE *); 1230 struct stat st; 1231 int fd; 1232 1233 if (restart_point && *mode != 'a') 1234 mode = "r+"; 1235 1236 if (unique && stat(name, &st) == 0) { 1237 char *nam; 1238 1239 fd = guniquefd(name, &nam); 1240 if (fd == -1) { 1241 LOGCMD(*mode == 'w' ? "put" : "append", name); 1242 return; 1243 } 1244 name = nam; 1245 fout = fdopen(fd, mode); 1246 } else 1247 fout = fopen(name, mode); 1248 1249 closefunc = fclose; 1250 if (fout == NULL) { 1251 perror_reply(553, name); 1252 LOGCMD(*mode == 'w' ? "put" : "append", name); 1253 return; 1254 } 1255 byte_count = -1; 1256 if (restart_point) { 1257 if (type == TYPE_A) { 1258 off_t i, n; 1259 int c; 1260 1261 n = restart_point; 1262 i = 0; 1263 while (i++ < n) { 1264 if ((c = getc(fout)) == EOF) { 1265 if (ferror(fout)) { 1266 perror_reply(550, name); 1267 goto done; 1268 } else 1269 break; 1270 } 1271 if (c == '\n') 1272 i++; 1273 } 1274 /* 1275 * We must do this seek to "current" position 1276 * because we are changing from reading to 1277 * writing. 1278 */ 1279 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1280 perror_reply(550, name); 1281 goto done; 1282 } 1283 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1284 perror_reply(550, name); 1285 goto done; 1286 } 1287 } 1288 din = dataconn(name, (off_t)-1, "r"); 1289 if (din == NULL) 1290 goto done; 1291 if (receive_data(din, fout) == 0) { 1292 if (unique) 1293 reply(226, "Transfer complete (unique file name:%s).", 1294 name); 1295 else 1296 reply(226, "Transfer complete."); 1297 } 1298 (void) fclose(din); 1299 data = -1; 1300 pdata = -1; 1301done: 1302 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1303 (*closefunc)(fout); 1304} 1305 1306static FILE * 1307getdatasock(char *mode) 1308{ 1309 int on = 1, s, t, tries; 1310 1311 if (data >= 0) 1312 return (fdopen(data, mode)); 1313 sigprocmask (SIG_BLOCK, &allsigs, NULL); 1314 s = monitor_socket(ctrl_addr.su_family); 1315 if (s < 0) 1316 goto bad; 1317 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1318 &on, sizeof(on)) < 0) 1319 goto bad; 1320 /* anchor socket to avoid multi-homing problems */ 1321 data_source = ctrl_addr; 1322 data_source.su_port = htons(20); /* ftp-data port */ 1323 for (tries = 1; ; tries++) { 1324 if (monitor_bind(s, (struct sockaddr *)&data_source, 1325 data_source.su_len) >= 0) 1326 break; 1327 if (errno != EADDRINUSE || tries > 10) 1328 goto bad; 1329 sleep((unsigned int)tries); 1330 } 1331 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1332 1333#ifdef IP_TOS 1334 if (ctrl_addr.su_family == AF_INET) { 1335 on = IPTOS_THROUGHPUT; 1336 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, 1337 sizeof(int)) < 0) 1338 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1339 } 1340#endif 1341#ifdef TCP_NOPUSH 1342 /* 1343 * Turn off push flag to keep sender TCP from sending short packets 1344 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1345 * to set the send buffer size as well, but that may not be desirable 1346 * in heavy-load situations. 1347 */ 1348 on = 1; 1349 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof(on)) < 0) 1350 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1351#endif 1352#ifdef SO_SNDBUF 1353 on = 65536; 1354 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof(on)) < 0) 1355 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1356#endif 1357 1358 return (fdopen(s, mode)); 1359bad: 1360 /* Return the real value of errno (close may change it) */ 1361 t = errno; 1362 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1363 if (s >= 0) 1364 (void) close(s); 1365 errno = t; 1366 return (NULL); 1367} 1368 1369static FILE * 1370dataconn(char *name, off_t size, char *mode) 1371{ 1372 char sizebuf[32]; 1373 FILE *file = NULL; 1374 int retry = 0; 1375 in_port_t *p; 1376 u_char *fa, *ha; 1377 size_t alen; 1378 int error; 1379 1380 file_size = size; 1381 byte_count = 0; 1382 if (size != (off_t) -1) { 1383 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1384 size); 1385 } else 1386 sizebuf[0] = '\0'; 1387 if (pdata >= 0) { 1388 union sockunion from; 1389 int s; 1390 socklen_t fromlen = sizeof(from); 1391 1392 (void) alarm ((unsigned) timeout); 1393 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1394 (void) alarm (0); 1395 if (s < 0) { 1396 reply(425, "Can't open data connection."); 1397 (void) close(pdata); 1398 pdata = -1; 1399 return (NULL); 1400 } 1401 switch (from.su_family) { 1402 case AF_INET: 1403 p = (in_port_t *)&from.su_sin.sin_port; 1404 fa = (u_char *)&from.su_sin.sin_addr; 1405 ha = (u_char *)&his_addr.su_sin.sin_addr; 1406 alen = sizeof(struct in_addr); 1407 break; 1408 case AF_INET6: 1409 p = (in_port_t *)&from.su_sin6.sin6_port; 1410 fa = (u_char *)&from.su_sin6.sin6_addr; 1411 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1412 alen = sizeof(struct in6_addr); 1413 break; 1414 default: 1415 reply(425, "Can't build data connection: " 1416 "unknown address family"); 1417 (void) close(pdata); 1418 (void) close(s); 1419 pdata = -1; 1420 return (NULL); 1421 } 1422 if (from.su_family != his_addr.su_family || 1423 ntohs(*p) < IPPORT_RESERVED) { 1424 reply(425, "Can't build data connection: " 1425 "address family or port error"); 1426 (void) close(pdata); 1427 (void) close(s); 1428 pdata = -1; 1429 return (NULL); 1430 } 1431 if (portcheck && memcmp(fa, ha, alen) != 0) { 1432 reply(425, "Can't build data connection: " 1433 "illegal port number"); 1434 (void) close(pdata); 1435 (void) close(s); 1436 pdata = -1; 1437 return (NULL); 1438 } 1439 (void) close(pdata); 1440 pdata = s; 1441 reply(150, "Opening %s mode data connection for '%s'%s.", 1442 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1443 return (fdopen(pdata, mode)); 1444 } 1445 if (data >= 0) { 1446 reply(125, "Using existing data connection for '%s'%s.", 1447 name, sizebuf); 1448 usedefault = 1; 1449 return (fdopen(data, mode)); 1450 } 1451 if (usedefault) 1452 data_dest = his_addr; 1453 usedefault = 1; 1454 do { 1455 if (file != NULL) 1456 (void) fclose(file); 1457 file = getdatasock(mode); 1458 if (file == NULL) { 1459 char hbuf[HOST_NAME_MAX+1], pbuf[10]; 1460 1461 error = getnameinfo((struct sockaddr *)&data_source, 1462 data_source.su_len, hbuf, sizeof(hbuf), pbuf, 1463 sizeof(pbuf), NI_NUMERICHOST | NI_NUMERICSERV); 1464 if (error != 0) 1465 reply(425, "Can't create data socket: %s.", 1466 strerror(errno)); 1467 else 1468 reply(425, 1469 "Can't create data socket (%s,%s): %s.", 1470 hbuf, pbuf, strerror(errno)); 1471 return (NULL); 1472 } 1473 1474 /* 1475 * attempt to connect to reserved port on client machine; 1476 * this looks like an attack 1477 */ 1478 switch (data_dest.su_family) { 1479 case AF_INET: 1480 p = (in_port_t *)&data_dest.su_sin.sin_port; 1481 fa = (u_char *)&data_dest.su_sin.sin_addr; 1482 ha = (u_char *)&his_addr.su_sin.sin_addr; 1483 alen = sizeof(struct in_addr); 1484 break; 1485 case AF_INET6: 1486 p = (in_port_t *)&data_dest.su_sin6.sin6_port; 1487 fa = (u_char *)&data_dest.su_sin6.sin6_addr; 1488 ha = (u_char *)&his_addr.su_sin6.sin6_addr; 1489 alen = sizeof(struct in6_addr); 1490 break; 1491 default: 1492 reply(425, "Can't build data connection: " 1493 "unknown address family"); 1494 (void) fclose(file); 1495 pdata = -1; 1496 return (NULL); 1497 } 1498 if (data_dest.su_family != his_addr.su_family || 1499 ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */ 1500 reply(425, "Can't build data connection: " 1501 "address family or port error"); 1502 (void) fclose(file); 1503 return NULL; 1504 } 1505 if (portcheck && memcmp(fa, ha, alen) != 0) { 1506 reply(435, "Can't build data connection: " 1507 "illegal port number"); 1508 (void) fclose(file); 1509 return NULL; 1510 } 1511 1512 if (connect(fileno(file), (struct sockaddr *)&data_dest, 1513 data_dest.su_len) == 0) { 1514 reply(150, "Opening %s mode data connection for '%s'%s.", 1515 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1516 data = fileno(file); 1517 return (file); 1518 } 1519 if (errno != EADDRINUSE) 1520 break; 1521 sleep((unsigned) swaitint); 1522 retry += swaitint; 1523 } while (retry <= swaitmax); 1524 perror_reply(425, "Can't build data connection"); 1525 (void) fclose(file); 1526 return (NULL); 1527} 1528 1529/* 1530 * Transfer the contents of "instr" to "outstr" peer using the appropriate 1531 * encapsulation of the data subject to Mode, Structure, and Type. 1532 * 1533 * NB: Form isn't handled. 1534 */ 1535static int 1536send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1537{ 1538 int c, cnt, filefd, netfd; 1539 char *buf, *bp; 1540 size_t len; 1541 1542 transflag++; 1543 switch (type) { 1544 1545 case TYPE_A: 1546 while ((c = getc(instr)) != EOF) { 1547 if (recvurg) 1548 goto got_oob; 1549 byte_count++; 1550 if (c == '\n') { 1551 if (ferror(outstr)) 1552 goto data_err; 1553 (void) putc('\r', outstr); 1554 } 1555 (void) putc(c, outstr); 1556 } 1557 fflush(outstr); 1558 transflag = 0; 1559 if (ferror(instr)) 1560 goto file_err; 1561 if (ferror(outstr)) 1562 goto data_err; 1563 reply(226, "Transfer complete."); 1564 return(0); 1565 1566 case TYPE_I: 1567 case TYPE_L: 1568 /* 1569 * isreg is only set if we are not doing restart and we 1570 * are sending a regular file 1571 */ 1572 netfd = fileno(outstr); 1573 filefd = fileno(instr); 1574 1575 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1576 size_t fsize = (size_t)filesize; 1577 1578 if (fsize == 0) { 1579 transflag = 0; 1580 reply(226, "Transfer complete."); 1581 return(0); 1582 } 1583 1584 buf = mmap(0, fsize, PROT_READ, MAP_SHARED, filefd, 1585 (off_t)0); 1586 if (buf == MAP_FAILED) { 1587 syslog(LOG_WARNING, "mmap(%llu): %m", 1588 (unsigned long long)fsize); 1589 goto oldway; 1590 } 1591 bp = buf; 1592 len = fsize; 1593 do { 1594 cnt = write(netfd, bp, len); 1595 if (recvurg) { 1596 munmap(buf, fsize); 1597 goto got_oob; 1598 } 1599 len -= cnt; 1600 bp += cnt; 1601 if (cnt > 0) 1602 byte_count += cnt; 1603 } while(cnt > 0 && len > 0); 1604 1605 transflag = 0; 1606 munmap(buf, fsize); 1607 if (cnt < 0) 1608 goto data_err; 1609 reply(226, "Transfer complete."); 1610 return(0); 1611 } 1612 1613oldway: 1614 if ((buf = malloc((size_t)blksize)) == NULL) { 1615 transflag = 0; 1616 perror_reply(451, "Local resource failure: malloc"); 1617 return(-1); 1618 } 1619 1620 while ((cnt = read(filefd, buf, (size_t)blksize)) > 0 && 1621 write(netfd, buf, cnt) == cnt) 1622 byte_count += cnt; 1623 transflag = 0; 1624 (void)free(buf); 1625 if (cnt != 0) { 1626 if (cnt < 0) 1627 goto file_err; 1628 goto data_err; 1629 } 1630 reply(226, "Transfer complete."); 1631 return(0); 1632 default: 1633 transflag = 0; 1634 reply(550, "Unimplemented TYPE %d in send_data", type); 1635 return(-1); 1636 } 1637 1638data_err: 1639 transflag = 0; 1640 reply(426, "Data connection"); 1641 return(-1); 1642 1643file_err: 1644 transflag = 0; 1645 reply(551, "Error on input file"); 1646 return(-1); 1647 1648got_oob: 1649 myoob(); 1650 recvurg = 0; 1651 transflag = 0; 1652 return(-1); 1653} 1654 1655/* 1656 * Transfer data from peer to "outstr" using the appropriate encapulation of 1657 * the data subject to Mode, Structure, and Type. 1658 * 1659 * N.B.: Form isn't handled. 1660 */ 1661static int 1662receive_data(FILE *instr, FILE *outstr) 1663{ 1664 int c; 1665 int cnt; 1666 char buf[BUFSIZ]; 1667 struct sigaction sa, sa_saved; 1668 volatile int bare_lfs = 0; 1669 1670 transflag++; 1671 switch (type) { 1672 1673 case TYPE_I: 1674 case TYPE_L: 1675 memset(&sa, 0, sizeof(sa)); 1676 sigfillset(&sa.sa_mask); 1677 sa.sa_flags = SA_RESTART; 1678 sa.sa_handler = lostconn; 1679 (void) sigaction(SIGALRM, &sa, &sa_saved); 1680 do { 1681 (void) alarm ((unsigned) timeout); 1682 cnt = read(fileno(instr), buf, sizeof(buf)); 1683 (void) alarm (0); 1684 if (recvurg) 1685 goto got_oob; 1686 1687 if (cnt > 0) { 1688 if (write(fileno(outstr), buf, cnt) != cnt) 1689 goto file_err; 1690 byte_count += cnt; 1691 } 1692 } while (cnt > 0); 1693 (void) sigaction(SIGALRM, &sa_saved, NULL); 1694 if (cnt < 0) 1695 goto data_err; 1696 transflag = 0; 1697 return (0); 1698 1699 case TYPE_E: 1700 reply(553, "TYPE E not implemented."); 1701 transflag = 0; 1702 return (-1); 1703 1704 case TYPE_A: 1705 while ((c = getc(instr)) != EOF) { 1706 if (recvurg) 1707 goto got_oob; 1708 byte_count++; 1709 if (c == '\n') 1710 bare_lfs++; 1711 while (c == '\r') { 1712 if (ferror(outstr)) 1713 goto data_err; 1714 if ((c = getc(instr)) != '\n') { 1715 (void) putc ('\r', outstr); 1716 if (c == '\0' || c == EOF) 1717 goto contin2; 1718 } 1719 } 1720 (void) putc(c, outstr); 1721 contin2: ; 1722 } 1723 fflush(outstr); 1724 if (ferror(instr)) 1725 goto data_err; 1726 if (ferror(outstr)) 1727 goto file_err; 1728 transflag = 0; 1729 if (bare_lfs) { 1730 lreply(226, 1731 "WARNING! %d bare linefeeds received in ASCII mode", 1732 bare_lfs); 1733 printf(" File may not have transferred correctly.\r\n"); 1734 } 1735 return (0); 1736 default: 1737 reply(550, "Unimplemented TYPE %d in receive_data", type); 1738 transflag = 0; 1739 return (-1); 1740 } 1741 1742data_err: 1743 transflag = 0; 1744 reply(426, "Data Connection"); 1745 return (-1); 1746 1747file_err: 1748 transflag = 0; 1749 reply(452, "Error writing file"); 1750 return (-1); 1751 1752got_oob: 1753 myoob(); 1754 recvurg = 0; 1755 transflag = 0; 1756 return (-1); 1757} 1758 1759void 1760statfilecmd(char *filename) 1761{ 1762 FILE *fin; 1763 int c; 1764 int atstart; 1765 pid_t pid; 1766 char line[LINE_MAX]; 1767 1768 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1769 fin = ftpd_popen(line, "r", &pid); 1770 if (fin == NULL) { 1771 reply(451, "Local resource failure"); 1772 return; 1773 } 1774 lreply(211, "status of %s:", filename); 1775 atstart = 1; 1776 while ((c = getc(fin)) != EOF) { 1777 if (c == '\n') { 1778 if (ferror(stdout)){ 1779 perror_reply(421, "control connection"); 1780 (void) ftpd_pclose(fin, pid); 1781 dologout(1); 1782 /* NOTREACHED */ 1783 } 1784 if (ferror(fin)) { 1785 perror_reply(551, filename); 1786 (void) ftpd_pclose(fin, pid); 1787 return; 1788 } 1789 (void) putc('\r', stdout); 1790 } 1791 if (atstart && isdigit(c)) 1792 (void) putc(' ', stdout); 1793 (void) putc(c, stdout); 1794 atstart = (c == '\n'); 1795 } 1796 (void) ftpd_pclose(fin, pid); 1797 reply(211, "End of Status"); 1798} 1799 1800void 1801statcmd(void) 1802{ 1803 union sockunion *su; 1804 u_char *a, *p; 1805 char hbuf[HOST_NAME_MAX+1]; 1806 int ispassive; 1807 int error; 1808 1809 lreply(211, "%s FTP server status:", hostname); 1810 error = getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1811 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST); 1812 printf(" Connected to %s", remotehost); 1813 if (error == 0 && strcmp(remotehost, hbuf) != 0) 1814 printf(" (%s)", hbuf); 1815 printf("\r\n"); 1816 if (logged_in) { 1817 if (guest) 1818 printf(" Logged in anonymously\r\n"); 1819 else 1820 printf(" Logged in as %s\r\n", pw->pw_name); 1821 } else if (askpasswd) 1822 printf(" Waiting for password\r\n"); 1823 else 1824 printf(" Waiting for user name\r\n"); 1825 printf(" TYPE: %s", typenames[type]); 1826 if (type == TYPE_A || type == TYPE_E) 1827 printf(", FORM: %s", formnames[form]); 1828 if (type == TYPE_L) 1829#if NBBY == 8 1830 printf(" %d", NBBY); 1831#else 1832 printf(" %d", bytesize); /* need definition! */ 1833#endif 1834 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1835 strunames[stru], modenames[mode]); 1836 ispassive = 0; 1837 if (data != -1) 1838 printf(" Data connection open\r\n"); 1839 else if (pdata != -1) { 1840 printf(" in Passive mode\r\n"); 1841 su = (union sockunion *)&pasv_addr; 1842 ispassive++; 1843 goto printaddr; 1844 } else if (usedefault == 0) { 1845 size_t alen; 1846 int af, i; 1847 1848 su = (union sockunion *)&data_dest; 1849printaddr: 1850 /* PASV/PORT */ 1851 if (su->su_family == AF_INET) { 1852 if (ispassive) 1853 printf("211- PASV "); 1854 else 1855 printf("211- PORT "); 1856 a = (u_char *)&su->su_sin.sin_addr; 1857 p = (u_char *)&su->su_sin.sin_port; 1858 printf("(%u,%u,%u,%u,%u,%u)\r\n", 1859 a[0], a[1], a[2], a[3], 1860 p[0], p[1]); 1861 } 1862 1863 /* LPSV/LPRT */ 1864 alen = 0; 1865 switch (su->su_family) { 1866 case AF_INET: 1867 a = (u_char *)&su->su_sin.sin_addr; 1868 p = (u_char *)&su->su_sin.sin_port; 1869 alen = sizeof(su->su_sin.sin_addr); 1870 af = 4; 1871 break; 1872 case AF_INET6: 1873 a = (u_char *)&su->su_sin6.sin6_addr; 1874 p = (u_char *)&su->su_sin6.sin6_port; 1875 alen = sizeof(su->su_sin6.sin6_addr); 1876 af = 6; 1877 break; 1878 default: 1879 af = 0; 1880 break; 1881 } 1882 if (af) { 1883 if (ispassive) 1884 printf("211- LPSV "); 1885 else 1886 printf("211- LPRT "); 1887 printf("(%u,%llu", af, (unsigned long long)alen); 1888 for (i = 0; i < alen; i++) 1889 printf(",%u", a[i]); 1890 printf(",%u,%u,%u)\r\n", 2, p[0], p[1]); 1891 } 1892 1893 /* EPRT/EPSV */ 1894 switch (su->su_family) { 1895 case AF_INET: 1896 af = 1; 1897 break; 1898 case AF_INET6: 1899 af = 2; 1900 break; 1901 default: 1902 af = 0; 1903 break; 1904 } 1905 if (af) { 1906 char pbuf[10]; 1907 union sockunion tmp = *su; 1908 1909 if (tmp.su_family == AF_INET6) 1910 tmp.su_sin6.sin6_scope_id = 0; 1911 if (getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 1912 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1913 NI_NUMERICHOST | NI_NUMERICSERV) == 0) { 1914 if (ispassive) 1915 printf("211- EPSV "); 1916 else 1917 printf("211- EPRT "); 1918 printf("(|%u|%s|%s|)\r\n", 1919 af, hbuf, pbuf); 1920 } 1921 } 1922 } else 1923 printf(" No data connection\r\n"); 1924 reply(211, "End of status"); 1925} 1926 1927void 1928fatal(char *s) 1929{ 1930 1931 reply(451, "Error in server: %s", s); 1932 reply(221, "Closing connection due to server error."); 1933 dologout(0); 1934 /* NOTREACHED */ 1935} 1936 1937void 1938reply(int n, const char *fmt, ...) 1939{ 1940 char *buf, *p, *next; 1941 int rval; 1942 va_list ap; 1943 1944 va_start(ap, fmt); 1945 rval = vasprintf(&buf, fmt, ap); 1946 va_end(ap); 1947 if (rval == -1 || buf == NULL) { 1948 printf("421 Local resource failure: malloc\r\n"); 1949 fflush(stdout); 1950 dologout(1); 1951 } 1952 next = buf; 1953 while ((p = strsep(&next, "\n\r"))) { 1954 printf("%d%s %s\r\n", n, (next != NULL) ? "-" : "", p); 1955 if (debug) 1956 syslog(LOG_DEBUG, "<--- %d%s %s", n, 1957 (next != NULL) ? "-" : "", p); 1958 } 1959 (void)fflush(stdout); 1960 free(buf); 1961} 1962 1963 1964void 1965reply_r(int n, const char *fmt, ...) 1966{ 1967 char *p, *next; 1968 char msg[BUFSIZ]; 1969 char buf[BUFSIZ]; 1970 va_list ap; 1971 struct syslog_data sdata = SYSLOG_DATA_INIT; 1972 1973 sdata.log_fac = LOG_FTP; 1974 va_start(ap, fmt); 1975 vsnprintf(msg, sizeof(msg), fmt, ap); 1976 va_end(ap); 1977 1978 next = msg; 1979 1980 while ((p = strsep(&next, "\n\r"))) { 1981 snprintf(buf, sizeof(buf), "%d%s %s\r\n", n, 1982 (next != NULL) ? "-" : "", p); 1983 write(STDOUT_FILENO, buf, strlen(buf)); 1984 if (debug) { 1985 buf[strlen(buf) - 2] = '\0'; 1986 syslog_r(LOG_DEBUG, &sdata, "<--- %s", buf); 1987 } 1988 } 1989} 1990 1991void 1992lreply(int n, const char *fmt, ...) 1993{ 1994 va_list ap; 1995 1996 va_start(ap, fmt); 1997 (void)printf("%d- ", n); 1998 (void)vprintf(fmt, ap); 1999 va_end(ap); 2000 (void)printf("\r\n"); 2001 (void)fflush(stdout); 2002 if (debug) { 2003 va_start(ap, fmt); 2004 syslog(LOG_DEBUG, "<--- %d- ", n); 2005 vsyslog(LOG_DEBUG, fmt, ap); 2006 va_end(ap); 2007 } 2008} 2009 2010static void 2011ack(char *s) 2012{ 2013 2014 reply(250, "%s command successful.", s); 2015} 2016 2017void 2018nack(char *s) 2019{ 2020 2021 reply(502, "%s command not implemented.", s); 2022} 2023 2024/* ARGSUSED */ 2025void 2026yyerror(char *s) 2027{ 2028 cbuf[strcspn(cbuf, "\n")] = '\0'; 2029 reply(500, "'%s': command not understood.", cbuf); 2030} 2031 2032void 2033delete(char *name) 2034{ 2035 struct stat st; 2036 2037 LOGCMD("delete", name); 2038 if (stat(name, &st) < 0) { 2039 perror_reply(550, name); 2040 return; 2041 } 2042 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2043 if (rmdir(name) < 0) { 2044 perror_reply(550, name); 2045 return; 2046 } 2047 goto done; 2048 } 2049 if (unlink(name) < 0) { 2050 perror_reply(550, name); 2051 return; 2052 } 2053done: 2054 ack("DELE"); 2055} 2056 2057void 2058cwd(char *path) 2059{ 2060 FILE *message; 2061 2062 if (chdir(path) < 0) 2063 perror_reply(550, path); 2064 else { 2065 if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) { 2066 char line[LINE_MAX]; 2067 2068 while (fgets(line, sizeof(line), message) != NULL) { 2069 line[strcspn(line, "\n")] = '\0'; 2070 lreply(250, "%s", line); 2071 } 2072 (void) fflush(stdout); 2073 (void) fclose(message); 2074 } 2075 ack("CWD"); 2076 } 2077} 2078 2079void 2080replydirname(const char *name, const char *message) 2081{ 2082 char *p, *ep; 2083 char npath[PATH_MAX * 2]; 2084 2085 p = npath; 2086 ep = &npath[sizeof(npath) - 1]; 2087 while (*name) { 2088 if (*name == '"') { 2089 if (ep - p < 2) 2090 break; 2091 *p++ = *name++; 2092 *p++ = '"'; 2093 } else { 2094 if (ep - p < 1) 2095 break; 2096 *p++ = *name++; 2097 } 2098 } 2099 *p = '\0'; 2100 reply(257, "\"%s\" %s", npath, message); 2101} 2102 2103void 2104makedir(char *name) 2105{ 2106 2107 LOGCMD("mkdir", name); 2108 if (mkdir(name, 0777) < 0) 2109 perror_reply(550, name); 2110 else 2111 replydirname(name, "directory created."); 2112} 2113 2114void 2115removedir(char *name) 2116{ 2117 2118 LOGCMD("rmdir", name); 2119 if (rmdir(name) < 0) 2120 perror_reply(550, name); 2121 else 2122 ack("RMD"); 2123} 2124 2125void 2126pwd(void) 2127{ 2128 char path[PATH_MAX]; 2129 2130 if (getcwd(path, sizeof(path)) == NULL) 2131 perror_reply(550, "Can't get current directory"); 2132 else 2133 replydirname(path, "is current directory."); 2134} 2135 2136char * 2137renamefrom(char *name) 2138{ 2139 struct stat st; 2140 2141 if (stat(name, &st) < 0) { 2142 perror_reply(550, name); 2143 return ((char *)0); 2144 } 2145 reply(350, "File exists, ready for destination name"); 2146 return (name); 2147} 2148 2149void 2150renamecmd(char *from, char *to) 2151{ 2152 2153 LOGCMD2("rename", from, to); 2154 if (rename(from, to) < 0) 2155 perror_reply(550, "rename"); 2156 else 2157 ack("RNTO"); 2158} 2159 2160static void 2161dolog(struct sockaddr *sa) 2162{ 2163 char hbuf[sizeof(remotehost)]; 2164 2165 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0) == 0) 2166 (void) strlcpy(remotehost, hbuf, sizeof(remotehost)); 2167 else 2168 (void) strlcpy(remotehost, "unknown", sizeof(remotehost)); 2169 2170 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2171 setproctitle("%s", proctitle); 2172 2173 if (logging) { 2174 int error; 2175 error = getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), 2176 NULL, 0, NI_NUMERICHOST); 2177 syslog(LOG_INFO, "connection from %s [%s]", remotehost, 2178 error ? gai_strerror(error) : hbuf); 2179 } 2180} 2181 2182/* 2183 * Record logout in wtmp file and exit with supplied status. 2184 * NOTE: because this is called from signal handlers it cannot 2185 * use stdio (or call other functions that use stdio). 2186 */ 2187void 2188dologout(int status) 2189{ 2190 2191 transflag = 0; 2192 2193 if (logged_in) { 2194 sigprocmask(SIG_BLOCK, &allsigs, NULL); 2195 if (!nowtmp) 2196 ftpdlogwtmp(ttyline, "", ""); 2197 if (doutmp) 2198 ftpd_logout(utmp.ut_line); 2199 } 2200 /* beware of flushing buffers after a SIGPIPE */ 2201 _exit(status); 2202} 2203 2204/*ARGSUSED*/ 2205static void 2206sigurg(int signo) 2207{ 2208 2209 recvurg = 1; 2210} 2211 2212static void 2213myoob(void) 2214{ 2215 char *cp; 2216 int ret; 2217 2218 /* only process if transfer occurring */ 2219 if (!transflag) 2220 return; 2221 cp = tmpline; 2222 ret = get_line(cp, sizeof(tmpline)-1, stdin); 2223 if (ret == -1) { 2224 reply(221, "You could at least say goodbye."); 2225 dologout(0); 2226 } else if (ret == -2) { 2227 /* Ignore truncated command */ 2228 return; 2229 } 2230 upper(cp); 2231 if (strcmp(cp, "ABOR\r\n") == 0) { 2232 tmpline[0] = '\0'; 2233 reply(426, "Transfer aborted. Data connection closed."); 2234 reply(226, "Abort successful"); 2235 } 2236 if (strcmp(cp, "STAT\r\n") == 0) { 2237 tmpline[0] = '\0'; 2238 if (file_size != (off_t) -1) 2239 reply(213, "Status: %qd of %qd bytes transferred", 2240 byte_count, file_size); 2241 else 2242 reply(213, "Status: %qd bytes transferred", byte_count); 2243 } 2244} 2245 2246/* 2247 * Note: a response of 425 is not mentioned as a possible response to 2248 * the PASV command in RFC959. However, it has been blessed as 2249 * a legitimate response by Jon Postel in a telephone conversation 2250 * with Rick Adams on 25 Jan 89. 2251 */ 2252void 2253passive(void) 2254{ 2255 socklen_t len; 2256 int on = 1; 2257 u_char *p, *a; 2258 2259 if (pw == NULL) { 2260 reply(530, "Please login with USER and PASS"); 2261 return; 2262 } 2263 if (pdata >= 0) 2264 close(pdata); 2265 /* 2266 * XXX 2267 * At this point, it would be nice to have an algorithm that 2268 * inserted a growing delay in an attack scenario. Such a thing 2269 * would look like continual passive sockets being opened, but 2270 * nothing serious being done with them. They're not used to 2271 * move data; the entire attempt is just to use tcp FIN_WAIT 2272 * resources. 2273 */ 2274 pdata = socket(AF_INET, SOCK_STREAM, 0); 2275 if (pdata < 0) { 2276 perror_reply(425, "Can't open passive connection"); 2277 return; 2278 } 2279 2280 if (setsockopt(pdata, SOL_SOCKET, SO_KEEPALIVE, 2281 &on, sizeof(on)) < 0) 2282 goto pasv_error; 2283 2284 on = IP_PORTRANGE_HIGH; 2285 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2286 &on, sizeof(on)) < 0) 2287 goto pasv_error; 2288 2289 pasv_addr = ctrl_addr; 2290 pasv_addr.su_sin.sin_port = 0; 2291 if (bind(pdata, (struct sockaddr *)&pasv_addr, 2292 pasv_addr.su_len) < 0) 2293 goto pasv_error; 2294 2295 len = sizeof(pasv_addr); 2296 if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) < 0) 2297 goto pasv_error; 2298 if (listen(pdata, 1) < 0) 2299 goto pasv_error; 2300 a = (u_char *)&pasv_addr.su_sin.sin_addr; 2301 p = (u_char *)&pasv_addr.su_sin.sin_port; 2302 2303 reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0], 2304 a[1], a[2], a[3], p[0], p[1]); 2305 return; 2306 2307pasv_error: 2308 perror_reply(425, "Can't open passive connection"); 2309 (void) close(pdata); 2310 pdata = -1; 2311 return; 2312} 2313 2314int 2315epsvproto2af(int proto) 2316{ 2317 2318 switch (proto) { 2319 case 1: return AF_INET; 2320#ifdef INET6 2321 case 2: return AF_INET6; 2322#endif 2323 default: return -1; 2324 } 2325} 2326 2327int 2328af2epsvproto(int af) 2329{ 2330 2331 switch (af) { 2332 case AF_INET: return 1; 2333#ifdef INET6 2334 case AF_INET6: return 2; 2335#endif 2336 default: return -1; 2337 } 2338} 2339 2340/* 2341 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2342 * 229 Entering Extended Passive Mode (|||port|) 2343 */ 2344void 2345long_passive(char *cmd, int pf) 2346{ 2347 socklen_t len; 2348 int on = 1; 2349 u_char *p, *a; 2350 2351 if (!logged_in) { 2352 syslog(LOG_NOTICE, "long passive but not logged in"); 2353 reply(503, "Login with USER first."); 2354 return; 2355 } 2356 2357 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2358 /* 2359 * XXX 2360 * only EPRT/EPSV ready clients will understand this 2361 */ 2362 if (strcmp(cmd, "EPSV") != 0) 2363 reply(501, "Network protocol mismatch"); /*XXX*/ 2364 else 2365 epsv_protounsupp("Network protocol mismatch"); 2366 2367 return; 2368 } 2369 2370 if (pdata >= 0) 2371 close(pdata); 2372 /* 2373 * XXX 2374 * At this point, it would be nice to have an algorithm that 2375 * inserted a growing delay in an attack scenario. Such a thing 2376 * would look like continual passive sockets being opened, but 2377 * nothing serious being done with them. They not used to move 2378 * data; the entire attempt is just to use tcp FIN_WAIT 2379 * resources. 2380 */ 2381 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2382 if (pdata < 0) { 2383 perror_reply(425, "Can't open passive connection"); 2384 return; 2385 } 2386 2387 if (setsockopt(pdata, SOL_SOCKET, SO_KEEPALIVE, 2388 &on, sizeof(on)) < 0) 2389 goto pasv_error; 2390 2391 switch (ctrl_addr.su_family) { 2392 case AF_INET: 2393 on = IP_PORTRANGE_HIGH; 2394 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2395 &on, sizeof(on)) < 0) 2396 goto pasv_error; 2397 break; 2398 case AF_INET6: 2399 on = IPV6_PORTRANGE_HIGH; 2400 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2401 &on, sizeof(on)) < 0) 2402 goto pasv_error; 2403 break; 2404 } 2405 2406 pasv_addr = ctrl_addr; 2407 pasv_addr.su_port = 0; 2408 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2409 goto pasv_error; 2410 len = pasv_addr.su_len; 2411 if (getsockname(pdata, (struct sockaddr *)&pasv_addr, &len) < 0) 2412 goto pasv_error; 2413 if (listen(pdata, 1) < 0) 2414 goto pasv_error; 2415 p = (u_char *)&pasv_addr.su_port; 2416 2417 if (strcmp(cmd, "LPSV") == 0) { 2418 switch (pasv_addr.su_family) { 2419 case AF_INET: 2420 a = (u_char *)&pasv_addr.su_sin.sin_addr; 2421 reply(228, 2422 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2423 4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]); 2424 return; 2425 case AF_INET6: 2426 a = (u_char *)&pasv_addr.su_sin6.sin6_addr; 2427 reply(228, 2428 "Entering Long Passive Mode (%u,%u,%u,%u,%u,%u," 2429 "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)", 2430 6, 16, a[0], a[1], a[2], a[3], a[4], 2431 a[5], a[6], a[7], a[8], a[9], a[10], 2432 a[11], a[12], a[13], a[14], a[15], 2433 2, p[0], p[1]); 2434 return; 2435 } 2436 } else if (strcmp(cmd, "EPSV") == 0) { 2437 switch (pasv_addr.su_family) { 2438 case AF_INET: 2439 case AF_INET6: 2440 reply(229, "Entering Extended Passive Mode (|||%u|)", 2441 ntohs(pasv_addr.su_port)); 2442 return; 2443 } 2444 } else { 2445 /* more proper error code? */ 2446 } 2447 2448 pasv_error: 2449 perror_reply(425, "Can't open passive connection"); 2450 (void) close(pdata); 2451 pdata = -1; 2452 return; 2453} 2454 2455/* 2456 * EPRT |proto|addr|port| 2457 */ 2458int 2459extended_port(const char *arg) 2460{ 2461 char *tmp = NULL; 2462 char *result[3]; 2463 char *p, *q; 2464 char delim; 2465 struct addrinfo hints; 2466 struct addrinfo *res = NULL; 2467 int i; 2468 unsigned long proto; 2469 2470 if (epsvall) { 2471 reply(501, "EPRT disallowed after EPSV ALL"); 2472 return -1; 2473 } 2474 2475 usedefault = 0; 2476 if (pdata >= 0) { 2477 (void) close(pdata); 2478 pdata = -1; 2479 } 2480 2481 tmp = strdup(arg); 2482 if (!tmp) { 2483 fatal("not enough core."); 2484 /*NOTREACHED*/ 2485 } 2486 p = tmp; 2487 delim = p[0]; 2488 p++; 2489 memset(result, 0, sizeof(result)); 2490 for (i = 0; i < 3; i++) { 2491 q = strchr(p, delim); 2492 if (!q || *q != delim) 2493 goto parsefail; 2494 *q++ = '\0'; 2495 result[i] = p; 2496 p = q; 2497 } 2498 2499 /* some more sanity check */ 2500 p = NULL; 2501 (void)strtoul(result[2], &p, 10); 2502 if (!*result[2] || *p) 2503 goto protounsupp; 2504 p = NULL; 2505 proto = strtoul(result[0], &p, 10); 2506 if (!*result[0] || *p) 2507 goto protounsupp; 2508 2509 memset(&hints, 0, sizeof(hints)); 2510 hints.ai_family = epsvproto2af((int)proto); 2511 if (hints.ai_family < 0) 2512 goto protounsupp; 2513 hints.ai_socktype = SOCK_STREAM; 2514 hints.ai_flags = AI_NUMERICHOST; /*no DNS*/ 2515 if (getaddrinfo(result[1], result[2], &hints, &res)) 2516 goto parsefail; 2517 if (res->ai_next) 2518 goto parsefail; 2519 if (sizeof(data_dest) < res->ai_addrlen) 2520 goto parsefail; 2521 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2522 if (his_addr.su_family == AF_INET6 && 2523 data_dest.su_family == AF_INET6) { 2524 /* XXX more sanity checks! */ 2525 data_dest.su_sin6.sin6_scope_id = 2526 his_addr.su_sin6.sin6_scope_id; 2527 } 2528 if (pdata >= 0) { 2529 (void) close(pdata); 2530 pdata = -1; 2531 } 2532 reply(200, "EPRT command successful."); 2533 2534 free(tmp); 2535 if (res) 2536 freeaddrinfo(res); 2537 return 0; 2538 2539parsefail: 2540 reply(500, "Invalid argument, rejected."); 2541 usedefault = 1; 2542 free(tmp); 2543 if (res) 2544 freeaddrinfo(res); 2545 return -1; 2546 2547protounsupp: 2548 epsv_protounsupp("Protocol not supported"); 2549 usedefault = 1; 2550 free(tmp); 2551 if (res) 2552 freeaddrinfo(res); 2553 return -1; 2554} 2555 2556/* 2557 * 522 Protocol not supported (proto,...) 2558 * as we assume address family for control and data connections are the same, 2559 * we do not return the list of address families we support - instead, we 2560 * return the address family of the control connection. 2561 */ 2562void 2563epsv_protounsupp(const char *message) 2564{ 2565 int proto; 2566 2567 proto = af2epsvproto(ctrl_addr.su_family); 2568 if (proto < 0) 2569 reply(501, "%s", message); /*XXX*/ 2570 else 2571 reply(522, "%s, use (%d)", message, proto); 2572} 2573 2574/* 2575 * Generate unique name for file with basename "local". 2576 * The file named "local" is already known to exist. 2577 * Generates failure reply on error. 2578 */ 2579static int 2580guniquefd(char *local, char **nam) 2581{ 2582 static char new[PATH_MAX]; 2583 struct stat st; 2584 int count, len, fd; 2585 char *cp; 2586 2587 cp = strrchr(local, '/'); 2588 if (cp) 2589 *cp = '\0'; 2590 if (stat(cp ? local : ".", &st) < 0) { 2591 perror_reply(553, cp ? local : "."); 2592 return (-1); 2593 } 2594 if (cp) 2595 *cp = '/'; 2596 len = strlcpy(new, local, sizeof(new)); 2597 if (len+2+1 >= sizeof(new)-1) 2598 return (-1); 2599 cp = new + len; 2600 *cp++ = '.'; 2601 for (count = 1; count < 100; count++) { 2602 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 2603 fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666); 2604 if (fd == -1) 2605 continue; 2606 if (nam) 2607 *nam = new; 2608 return (fd); 2609 } 2610 reply(452, "Unique file name cannot be created."); 2611 return (-1); 2612} 2613 2614/* 2615 * Format and send reply containing system error number. 2616 */ 2617void 2618perror_reply(int code, char *string) 2619{ 2620 2621 reply(code, "%s: %s.", string, strerror(errno)); 2622} 2623 2624static char *onefile[] = { 2625 "", 2626 0 2627}; 2628 2629void 2630send_file_list(char *whichf) 2631{ 2632 struct stat st; 2633 DIR *dirp = NULL; 2634 struct dirent *dir; 2635 FILE *dout = NULL; 2636 char **dirlist; 2637 char *dirname; 2638 int simple = 0; 2639 volatile int freeglob = 0; 2640 glob_t gl; 2641 2642 if (strpbrk(whichf, "~{[*?") != NULL) { 2643 memset(&gl, 0, sizeof(gl)); 2644 freeglob = 1; 2645 if (glob(whichf, 2646 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, 2647 0, &gl)) { 2648 reply(550, "not found"); 2649 goto out; 2650 } else if (gl.gl_pathc == 0) { 2651 errno = ENOENT; 2652 perror_reply(550, whichf); 2653 goto out; 2654 } 2655 dirlist = gl.gl_pathv; 2656 } else { 2657 onefile[0] = whichf; 2658 dirlist = onefile; 2659 simple = 1; 2660 } 2661 2662 while ((dirname = *dirlist++)) { 2663 if (stat(dirname, &st) < 0) { 2664 /* 2665 * If user typed "ls -l", etc, and the client 2666 * used NLST, do what the user meant. 2667 */ 2668 if (dirname[0] == '-' && *dirlist == NULL && 2669 transflag == 0) { 2670 retrieve("/bin/ls %s", dirname); 2671 goto out; 2672 } 2673 perror_reply(550, whichf); 2674 if (dout != NULL) { 2675 (void) fclose(dout); 2676 transflag = 0; 2677 data = -1; 2678 pdata = -1; 2679 } 2680 goto out; 2681 } 2682 2683 if (S_ISREG(st.st_mode)) { 2684 if (dout == NULL) { 2685 dout = dataconn("file list", (off_t)-1, "w"); 2686 if (dout == NULL) 2687 goto out; 2688 transflag++; 2689 } 2690 fprintf(dout, "%s%s\n", dirname, 2691 type == TYPE_A ? "\r" : ""); 2692 byte_count += strlen(dirname) + 1; 2693 continue; 2694 } else if (!S_ISDIR(st.st_mode)) 2695 continue; 2696 2697 if ((dirp = opendir(dirname)) == NULL) 2698 continue; 2699 2700 while ((dir = readdir(dirp)) != NULL) { 2701 char nbuf[PATH_MAX]; 2702 2703 if (recvurg) { 2704 myoob(); 2705 recvurg = 0; 2706 transflag = 0; 2707 goto out; 2708 } 2709 2710 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2711 continue; 2712 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2713 dir->d_namlen == 2) 2714 continue; 2715 2716 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 2717 dir->d_name); 2718 2719 /* 2720 * We have to do a stat to insure it's 2721 * not a directory or special file. 2722 */ 2723 if (simple || (stat(nbuf, &st) == 0 && 2724 S_ISREG(st.st_mode))) { 2725 if (dout == NULL) { 2726 dout = dataconn("file list", (off_t)-1, 2727 "w"); 2728 if (dout == NULL) 2729 goto out; 2730 transflag++; 2731 } 2732 if (nbuf[0] == '.' && nbuf[1] == '/') 2733 fprintf(dout, "%s%s\n", &nbuf[2], 2734 type == TYPE_A ? "\r" : ""); 2735 else 2736 fprintf(dout, "%s%s\n", nbuf, 2737 type == TYPE_A ? "\r" : ""); 2738 byte_count += strlen(nbuf) + 1; 2739 } 2740 } 2741 (void) closedir(dirp); 2742 } 2743 2744 if (dout == NULL) 2745 reply(550, "No files found."); 2746 else if (ferror(dout) != 0) 2747 perror_reply(550, "Data connection"); 2748 else 2749 reply(226, "Transfer complete."); 2750 2751 transflag = 0; 2752 if (dout != NULL) 2753 (void) fclose(dout); 2754 else { 2755 if (pdata >= 0) 2756 close(pdata); 2757 } 2758 data = -1; 2759 pdata = -1; 2760out: 2761 if (freeglob) { 2762 freeglob = 0; 2763 globfree(&gl); 2764 } 2765} 2766 2767/*ARGSUSED*/ 2768static void 2769reapchild(int signo) 2770{ 2771 int save_errno = errno; 2772 int rval; 2773 2774 do { 2775 rval = waitpid(-1, NULL, WNOHANG); 2776 } while (rval > 0 || (rval == -1 && errno == EINTR)); 2777 errno = save_errno; 2778} 2779 2780void 2781logxfer(char *name, off_t size, time_t start) 2782{ 2783 char buf[400 + (HOST_NAME_MAX+1)*4 + PATH_MAX*4]; 2784 char dir[PATH_MAX], path[PATH_MAX], rpath[PATH_MAX]; 2785 char vremotehost[(HOST_NAME_MAX+1)*4], vpath[PATH_MAX*4]; 2786 char *vpw; 2787 time_t now; 2788 int len; 2789 2790 if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) { 2791 time(&now); 2792 2793 vpw = malloc(strlen(guest ? guestpw : pw->pw_name) * 4 + 1); 2794 if (vpw == NULL) 2795 return; 2796 2797 snprintf(path, sizeof(path), "%s/%s", dir, name); 2798 if (realpath(path, rpath) == NULL) 2799 strlcpy(rpath, path, sizeof(rpath)); 2800 strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH); 2801 2802 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2803 strvis(vpw, guest? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2804 2805 len = snprintf(buf, sizeof(buf), 2806 "%.24s %lld %s %qd %s %c %s %c %c %s ftp %d %s %s\n", 2807 ctime(&now), (long long)(now - start + (now == start)), 2808 vremotehost, (long long)size, vpath, 2809 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2810 'o', ((guest) ? 'a' : 'r'), 2811 vpw, 0 /* none yet */, 2812 ((guest) ? "*" : pw->pw_name), dhostname); 2813 free(vpw); 2814 2815 if (len >= sizeof(buf) || len == -1) { 2816 if ((len = strlen(buf)) == 0) 2817 return; /* should not happen */ 2818 buf[len - 1] = '\n'; 2819 } 2820 write(statfd, buf, len); 2821 } 2822} 2823 2824void 2825set_slave_signals(void) 2826{ 2827 struct sigaction sa; 2828 2829 sigemptyset(&sa.sa_mask); 2830 sa.sa_flags = SA_RESTART; 2831 2832 sa.sa_handler = SIG_DFL; 2833 (void) sigaction(SIGCHLD, &sa, NULL); 2834 2835 sa.sa_handler = sigurg; 2836 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 2837 (void) sigaction(SIGURG, &sa, NULL); 2838 2839 sigfillset(&sa.sa_mask); /* block all signals in handler */ 2840 sa.sa_flags = SA_RESTART; 2841 sa.sa_handler = sigquit; 2842 (void) sigaction(SIGHUP, &sa, NULL); 2843 (void) sigaction(SIGINT, &sa, NULL); 2844 (void) sigaction(SIGQUIT, &sa, NULL); 2845 (void) sigaction(SIGTERM, &sa, NULL); 2846 2847 sa.sa_handler = lostconn; 2848 (void) sigaction(SIGPIPE, &sa, NULL); 2849 2850 sa.sa_handler = toolong; 2851 (void) sigaction(SIGALRM, &sa, NULL); 2852 2853#ifdef F_SETOWN 2854 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 2855 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 2856#endif 2857} 2858 2859/* 2860 * Allocate space and return a copy of the specified dir. 2861 * If 'dir' begins with a tilde (~), expand it. 2862 */ 2863char * 2864copy_dir(char *dir, struct passwd *pw) 2865{ 2866 char *cp; 2867 char *newdir; 2868 char *user = NULL; 2869 2870 /* Nothing to expand */ 2871 if (dir[0] != '~') 2872 return (strdup(dir)); 2873 2874 /* "dir" is of form ~user/some/dir, lookup user. */ 2875 if (dir[1] != '/' && dir[1] != '\0') { 2876 if ((cp = strchr(dir + 1, '/')) == NULL) 2877 cp = dir + strlen(dir); 2878 if ((user = malloc((size_t)(cp - dir))) == NULL) 2879 return (NULL); 2880 strlcpy(user, dir + 1, (size_t)(cp - dir)); 2881 2882 /* Only do lookup if it is a different user. */ 2883 if (strcmp(user, pw->pw_name) != 0) { 2884 if ((pw = getpwnam(user)) == NULL) { 2885 /* No such user, interpret literally */ 2886 free(user); 2887 return(strdup(dir)); 2888 } 2889 } 2890 free(user); 2891 } 2892 2893 /* 2894 * If there is no directory separator (/) then it is just pw_dir. 2895 * Otherwise, replace ~foo with pw_dir. 2896 */ 2897 if ((cp = strchr(dir + 1, '/')) == NULL) { 2898 newdir = strdup(pw->pw_dir); 2899 } else { 2900 if (asprintf(&newdir, "%s%s", pw->pw_dir, cp) == -1) 2901 return (NULL); 2902 } 2903 2904 return(newdir); 2905} 2906