1 /* 2 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if 0 31 #ifndef lint 32 static char copyright[] = 33 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 34 The Regents of the University of California. All rights reserved.\n"; 35 #endif /* not lint */ 36 #endif 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 41 #endif 42 #endif /* not lint */ 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 /* 48 * FTP server. 49 */ 50 #include <sys/param.h> 51 #include <sys/ioctl.h> 52 #include <sys/mman.h> 53 #include <sys/socket.h> 54 #include <sys/stat.h> 55 #include <sys/time.h> 56 #include <sys/wait.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/ip.h> 61 #include <netinet/tcp.h> 62 63 #define FTP_NAMES 64 #include <arpa/ftp.h> 65 #include <arpa/inet.h> 66 #include <arpa/telnet.h> 67 68 #include <ctype.h> 69 #include <dirent.h> 70 #include <err.h> 71 #include <errno.h> 72 #include <fcntl.h> 73 #include <glob.h> 74 #include <limits.h> 75 #include <netdb.h> 76 #include <pwd.h> 77 #include <grp.h> 78 #include <opie.h> 79 #include <signal.h> 80 #include <stdint.h> 81 #include <stdio.h> 82 #include <stdlib.h> 83 #include <string.h> 84 #include <syslog.h> 85 #include <time.h> 86 #include <unistd.h> 87 #include <libutil.h> 88 #ifdef LOGIN_CAP 89 #include <login_cap.h> 90 #endif 91 92 #ifdef USE_PAM 93 #include <security/pam_appl.h> 94 #endif 95 96 #include "blacklist_client.h" 97 #include "pathnames.h" 98 #include "extern.h" 99 100 #include <stdarg.h> 101 102 static char version[] = "Version 6.00LS"; 103 #undef main 104 105 union sockunion ctrl_addr; 106 union sockunion data_source; 107 union sockunion data_dest; 108 union sockunion his_addr; 109 union sockunion pasv_addr; 110 111 int daemon_mode; 112 int data; 113 int dataport; 114 int hostinfo = 1; /* print host-specific info in messages */ 115 int logged_in; 116 struct passwd *pw; 117 char *homedir; 118 int ftpdebug; 119 int timeout = 900; /* timeout after 15 minutes of inactivity */ 120 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 121 int logging; 122 int restricted_data_ports = 1; 123 int paranoid = 1; /* be extra careful about security */ 124 int anon_only = 0; /* Only anonymous ftp allowed */ 125 int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 126 int guest; 127 int dochroot; 128 char *chrootdir; 129 int dowtmp = 1; 130 int stats; 131 int statfd = -1; 132 int type; 133 int form; 134 int stru; /* avoid C keyword */ 135 int mode; 136 int usedefault = 1; /* for data transfers */ 137 int pdata = -1; /* for passive mode */ 138 int readonly = 0; /* Server is in readonly mode. */ 139 int noepsv = 0; /* EPSV command is disabled. */ 140 int noretr = 0; /* RETR command is disabled. */ 141 int noguestretr = 0; /* RETR command is disabled for anon users. */ 142 int noguestmkd = 0; /* MKD command is disabled for anon users. */ 143 int noguestmod = 1; /* anon users may not modify existing files. */ 144 int use_blacklist = 0; 145 146 off_t file_size; 147 off_t byte_count; 148 #if !defined(CMASK) || CMASK == 0 149 #undef CMASK 150 #define CMASK 027 151 #endif 152 int defumask = CMASK; /* default umask value */ 153 char tmpline[7]; 154 char *hostname; 155 int epsvall = 0; 156 157 #ifdef VIRTUAL_HOSTING 158 char *ftpuser; 159 160 static struct ftphost { 161 struct ftphost *next; 162 struct addrinfo *hostinfo; 163 char *hostname; 164 char *anonuser; 165 char *statfile; 166 char *welcome; 167 char *loginmsg; 168 } *thishost, *firsthost; 169 170 #endif 171 char remotehost[NI_MAXHOST]; 172 char *ident = NULL; 173 174 static char wtmpid[20]; 175 176 #ifdef USE_PAM 177 static int auth_pam(struct passwd**, const char*); 178 pam_handle_t *pamh = NULL; 179 #endif 180 181 static struct opie opiedata; 182 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 183 static int pwok; 184 185 char *pid_file = NULL; /* means default location to pidfile(3) */ 186 187 /* 188 * Limit number of pathnames that glob can return. 189 * A limit of 0 indicates the number of pathnames is unlimited. 190 */ 191 #define MAXGLOBARGS 16384 192 # 193 194 /* 195 * Timeout intervals for retrying connections 196 * to hosts that don't accept PORT cmds. This 197 * is a kludge, but given the problems with TCP... 198 */ 199 #define SWAITMAX 90 /* wait at most 90 seconds */ 200 #define SWAITINT 5 /* interval between retries */ 201 202 int swaitmax = SWAITMAX; 203 int swaitint = SWAITINT; 204 205 #ifdef SETPROCTITLE 206 #ifdef OLD_SETPROCTITLE 207 char **Argv = NULL; /* pointer to argument vector */ 208 char *LastArgv = NULL; /* end of argv */ 209 #endif /* OLD_SETPROCTITLE */ 210 char proctitle[LINE_MAX]; /* initial part of title */ 211 #endif /* SETPROCTITLE */ 212 213 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 214 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 215 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 216 217 static volatile sig_atomic_t recvurg; 218 static int transflag; /* NB: for debugging only */ 219 220 #define STARTXFER flagxfer(1) 221 #define ENDXFER flagxfer(0) 222 223 #define START_UNSAFE maskurg(1) 224 #define END_UNSAFE maskurg(0) 225 226 /* It's OK to put an `else' clause after this macro. */ 227 #define CHECKOOB(action) \ 228 if (recvurg) { \ 229 recvurg = 0; \ 230 if (myoob()) { \ 231 ENDXFER; \ 232 action; \ 233 } \ 234 } 235 236 #ifdef VIRTUAL_HOSTING 237 static void inithosts(int); 238 static void selecthost(union sockunion *); 239 #endif 240 static void ack(char *); 241 static void sigurg(int); 242 static void maskurg(int); 243 static void flagxfer(int); 244 static int myoob(void); 245 static int checkuser(char *, char *, int, char **, int *); 246 static FILE *dataconn(char *, off_t, char *); 247 static void dolog(struct sockaddr *); 248 static void end_login(void); 249 static FILE *getdatasock(char *); 250 static int guniquefd(char *, char **); 251 static void lostconn(int); 252 static void sigquit(int); 253 static int receive_data(FILE *, FILE *); 254 static int send_data(FILE *, FILE *, size_t, off_t, int); 255 static struct passwd * 256 sgetpwnam(char *); 257 static char *sgetsave(char *); 258 static void reapchild(int); 259 static void appendf(char **, char *, ...) __printflike(2, 3); 260 static void logcmd(char *, char *, char *, off_t); 261 static void logxfer(char *, off_t, time_t); 262 static char *doublequote(char *); 263 static int *socksetup(int, char *, const char *); 264 265 int 266 main(int argc, char *argv[], char **envp) 267 { 268 socklen_t addrlen; 269 int ch, on = 1, tos, s = STDIN_FILENO; 270 char *cp, line[LINE_MAX]; 271 FILE *fd; 272 char *bindname = NULL; 273 const char *bindport = "ftp"; 274 int family = AF_UNSPEC; 275 struct sigaction sa; 276 277 tzset(); /* in case no timezone database in ~ftp */ 278 sigemptyset(&sa.sa_mask); 279 sa.sa_flags = SA_RESTART; 280 281 #ifdef OLD_SETPROCTITLE 282 /* 283 * Save start and extent of argv for setproctitle. 284 */ 285 Argv = argv; 286 while (*envp) 287 envp++; 288 LastArgv = envp[-1] + strlen(envp[-1]); 289 #endif /* OLD_SETPROCTITLE */ 290 291 /* 292 * Prevent diagnostic messages from appearing on stderr. 293 * We run as a daemon or from inetd; in both cases, there's 294 * more reason in logging to syslog. 295 */ 296 (void) freopen(_PATH_DEVNULL, "w", stderr); 297 opterr = 0; 298 299 /* 300 * LOG_NDELAY sets up the logging connection immediately, 301 * necessary for anonymous ftp's that chroot and can't do it later. 302 */ 303 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 304 305 while ((ch = getopt(argc, argv, 306 "468a:ABdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 307 switch (ch) { 308 case '4': 309 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 310 break; 311 312 case '6': 313 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 314 break; 315 316 case '8': 317 assumeutf8 = 1; 318 break; 319 320 case 'a': 321 bindname = optarg; 322 break; 323 324 case 'A': 325 anon_only = 1; 326 break; 327 328 case 'B': 329 #ifdef USE_BLACKLIST 330 use_blacklist = 1; 331 #else 332 syslog(LOG_WARNING, "not compiled with USE_BLACKLIST support"); 333 #endif 334 break; 335 336 case 'd': 337 ftpdebug++; 338 break; 339 340 case 'D': 341 daemon_mode++; 342 break; 343 344 case 'E': 345 noepsv = 1; 346 break; 347 348 case 'h': 349 hostinfo = 0; 350 break; 351 352 case 'l': 353 logging++; /* > 1 == extra logging */ 354 break; 355 356 case 'm': 357 noguestmod = 0; 358 break; 359 360 case 'M': 361 noguestmkd = 1; 362 break; 363 364 case 'o': 365 noretr = 1; 366 break; 367 368 case 'O': 369 noguestretr = 1; 370 break; 371 372 case 'p': 373 pid_file = optarg; 374 break; 375 376 case 'P': 377 bindport = optarg; 378 break; 379 380 case 'r': 381 readonly = 1; 382 break; 383 384 case 'R': 385 paranoid = 0; 386 break; 387 388 case 'S': 389 stats++; 390 break; 391 392 case 't': 393 timeout = atoi(optarg); 394 if (maxtimeout < timeout) 395 maxtimeout = timeout; 396 break; 397 398 case 'T': 399 maxtimeout = atoi(optarg); 400 if (timeout > maxtimeout) 401 timeout = maxtimeout; 402 break; 403 404 case 'u': 405 { 406 long val = 0; 407 408 val = strtol(optarg, &optarg, 8); 409 if (*optarg != '\0' || val < 0) 410 syslog(LOG_WARNING, "bad value for -u"); 411 else 412 defumask = val; 413 break; 414 } 415 case 'U': 416 restricted_data_ports = 0; 417 break; 418 419 case 'v': 420 ftpdebug++; 421 break; 422 423 case 'W': 424 dowtmp = 0; 425 break; 426 427 default: 428 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 429 break; 430 } 431 } 432 433 if (daemon_mode) { 434 int *ctl_sock, fd, maxfd = -1, nfds, i; 435 fd_set defreadfds, readfds; 436 pid_t pid; 437 struct pidfh *pfh; 438 439 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) { 440 if (errno == EEXIST) { 441 syslog(LOG_ERR, "%s already running, pid %d", 442 getprogname(), (int)pid); 443 exit(1); 444 } 445 syslog(LOG_WARNING, "pidfile_open: %m"); 446 } 447 448 /* 449 * Detach from parent. 450 */ 451 if (daemon(1, 1) < 0) { 452 syslog(LOG_ERR, "failed to become a daemon"); 453 exit(1); 454 } 455 456 if (pfh != NULL && pidfile_write(pfh) == -1) 457 syslog(LOG_WARNING, "pidfile_write: %m"); 458 459 sa.sa_handler = reapchild; 460 (void)sigaction(SIGCHLD, &sa, NULL); 461 462 #ifdef VIRTUAL_HOSTING 463 inithosts(family); 464 #endif 465 466 /* 467 * Open a socket, bind it to the FTP port, and start 468 * listening. 469 */ 470 ctl_sock = socksetup(family, bindname, bindport); 471 if (ctl_sock == NULL) 472 exit(1); 473 474 FD_ZERO(&defreadfds); 475 for (i = 1; i <= *ctl_sock; i++) { 476 FD_SET(ctl_sock[i], &defreadfds); 477 if (listen(ctl_sock[i], 32) < 0) { 478 syslog(LOG_ERR, "control listen: %m"); 479 exit(1); 480 } 481 if (maxfd < ctl_sock[i]) 482 maxfd = ctl_sock[i]; 483 } 484 485 /* 486 * Loop forever accepting connection requests and forking off 487 * children to handle them. 488 */ 489 while (1) { 490 FD_COPY(&defreadfds, &readfds); 491 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 492 if (nfds <= 0) { 493 if (nfds < 0 && errno != EINTR) 494 syslog(LOG_WARNING, "select: %m"); 495 continue; 496 } 497 498 pid = -1; 499 for (i = 1; i <= *ctl_sock; i++) 500 if (FD_ISSET(ctl_sock[i], &readfds)) { 501 addrlen = sizeof(his_addr); 502 fd = accept(ctl_sock[i], 503 (struct sockaddr *)&his_addr, 504 &addrlen); 505 if (fd == -1) { 506 syslog(LOG_WARNING, 507 "accept: %m"); 508 continue; 509 } 510 switch (pid = fork()) { 511 case 0: 512 /* child */ 513 (void) dup2(fd, s); 514 (void) dup2(fd, STDOUT_FILENO); 515 (void) close(fd); 516 for (i = 1; i <= *ctl_sock; i++) 517 close(ctl_sock[i]); 518 if (pfh != NULL) 519 pidfile_close(pfh); 520 goto gotchild; 521 case -1: 522 syslog(LOG_WARNING, "fork: %m"); 523 /* FALLTHROUGH */ 524 default: 525 close(fd); 526 } 527 } 528 } 529 } else { 530 addrlen = sizeof(his_addr); 531 if (getpeername(s, (struct sockaddr *)&his_addr, &addrlen) < 0) { 532 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 533 exit(1); 534 } 535 536 #ifdef VIRTUAL_HOSTING 537 if (his_addr.su_family == AF_INET6 && 538 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 539 family = AF_INET; 540 else 541 family = his_addr.su_family; 542 inithosts(family); 543 #endif 544 } 545 546 gotchild: 547 sa.sa_handler = SIG_DFL; 548 (void)sigaction(SIGCHLD, &sa, NULL); 549 550 sa.sa_handler = sigurg; 551 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 552 (void)sigaction(SIGURG, &sa, NULL); 553 554 sigfillset(&sa.sa_mask); /* block all signals in handler */ 555 sa.sa_flags = SA_RESTART; 556 sa.sa_handler = sigquit; 557 (void)sigaction(SIGHUP, &sa, NULL); 558 (void)sigaction(SIGINT, &sa, NULL); 559 (void)sigaction(SIGQUIT, &sa, NULL); 560 (void)sigaction(SIGTERM, &sa, NULL); 561 562 sa.sa_handler = lostconn; 563 (void)sigaction(SIGPIPE, &sa, NULL); 564 565 addrlen = sizeof(ctrl_addr); 566 if (getsockname(s, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 567 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 568 exit(1); 569 } 570 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 571 #ifdef VIRTUAL_HOSTING 572 /* select our identity from virtual host table */ 573 selecthost(&ctrl_addr); 574 #endif 575 #ifdef IP_TOS 576 if (ctrl_addr.su_family == AF_INET) 577 { 578 tos = IPTOS_LOWDELAY; 579 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 580 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 581 } 582 #endif 583 /* 584 * Disable Nagle on the control channel so that we don't have to wait 585 * for peer's ACK before issuing our next reply. 586 */ 587 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 588 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 589 590 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 591 592 (void)snprintf(wtmpid, sizeof(wtmpid), "%xftpd", getpid()); 593 594 /* Try to handle urgent data inline */ 595 #ifdef SO_OOBINLINE 596 if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 597 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 598 #endif 599 600 #ifdef F_SETOWN 601 if (fcntl(s, F_SETOWN, getpid()) == -1) 602 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 603 #endif 604 dolog((struct sockaddr *)&his_addr); 605 /* 606 * Set up default state 607 */ 608 data = -1; 609 type = TYPE_A; 610 form = FORM_N; 611 stru = STRU_F; 612 mode = MODE_S; 613 tmpline[0] = '\0'; 614 615 /* If logins are disabled, print out the message. */ 616 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 617 while (fgets(line, sizeof(line), fd) != NULL) { 618 if ((cp = strchr(line, '\n')) != NULL) 619 *cp = '\0'; 620 lreply(530, "%s", line); 621 } 622 (void) fflush(stdout); 623 (void) fclose(fd); 624 reply(530, "System not available."); 625 exit(0); 626 } 627 #ifdef VIRTUAL_HOSTING 628 fd = fopen(thishost->welcome, "r"); 629 #else 630 fd = fopen(_PATH_FTPWELCOME, "r"); 631 #endif 632 if (fd != NULL) { 633 while (fgets(line, sizeof(line), fd) != NULL) { 634 if ((cp = strchr(line, '\n')) != NULL) 635 *cp = '\0'; 636 lreply(220, "%s", line); 637 } 638 (void) fflush(stdout); 639 (void) fclose(fd); 640 /* reply(220,) must follow */ 641 } 642 #ifndef VIRTUAL_HOSTING 643 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 644 fatalerror("Ran out of memory."); 645 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 646 hostname[0] = '\0'; 647 hostname[MAXHOSTNAMELEN - 1] = '\0'; 648 #endif 649 if (hostinfo) 650 reply(220, "%s FTP server (%s) ready.", hostname, version); 651 else 652 reply(220, "FTP server ready."); 653 BLACKLIST_INIT(); 654 for (;;) 655 (void) yyparse(); 656 /* NOTREACHED */ 657 } 658 659 static void 660 lostconn(int signo) 661 { 662 663 if (ftpdebug) 664 syslog(LOG_DEBUG, "lost connection"); 665 dologout(1); 666 } 667 668 static void 669 sigquit(int signo) 670 { 671 672 syslog(LOG_ERR, "got signal %d", signo); 673 dologout(1); 674 } 675 676 #ifdef VIRTUAL_HOSTING 677 /* 678 * read in virtual host tables (if they exist) 679 */ 680 681 static void 682 inithosts(int family) 683 { 684 int insert; 685 size_t len; 686 FILE *fp; 687 char *cp, *mp, *line; 688 char *hostname; 689 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 690 struct ftphost *hrp, *lhrp; 691 struct addrinfo hints, *res, *ai; 692 693 /* 694 * Fill in the default host information 695 */ 696 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 697 fatalerror("Ran out of memory."); 698 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 699 hostname[0] = '\0'; 700 hostname[MAXHOSTNAMELEN - 1] = '\0'; 701 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 702 fatalerror("Ran out of memory."); 703 hrp->hostname = hostname; 704 hrp->hostinfo = NULL; 705 706 memset(&hints, 0, sizeof(hints)); 707 hints.ai_flags = AI_PASSIVE; 708 hints.ai_family = family; 709 hints.ai_socktype = SOCK_STREAM; 710 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 711 hrp->hostinfo = res; 712 hrp->statfile = _PATH_FTPDSTATFILE; 713 hrp->welcome = _PATH_FTPWELCOME; 714 hrp->loginmsg = _PATH_FTPLOGINMESG; 715 hrp->anonuser = "ftp"; 716 hrp->next = NULL; 717 thishost = firsthost = lhrp = hrp; 718 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 719 int addrsize, gothost; 720 void *addr; 721 struct hostent *hp; 722 723 while ((line = fgetln(fp, &len)) != NULL) { 724 int i, hp_error; 725 726 /* skip comments */ 727 if (line[0] == '#') 728 continue; 729 if (line[len - 1] == '\n') { 730 line[len - 1] = '\0'; 731 mp = NULL; 732 } else { 733 if ((mp = malloc(len + 1)) == NULL) 734 fatalerror("Ran out of memory."); 735 memcpy(mp, line, len); 736 mp[len] = '\0'; 737 line = mp; 738 } 739 cp = strtok(line, " \t"); 740 /* skip empty lines */ 741 if (cp == NULL) 742 goto nextline; 743 vhost = cp; 744 745 /* set defaults */ 746 anonuser = "ftp"; 747 statfile = _PATH_FTPDSTATFILE; 748 welcome = _PATH_FTPWELCOME; 749 loginmsg = _PATH_FTPLOGINMESG; 750 751 /* 752 * Preparse the line so we can use its info 753 * for all the addresses associated with 754 * the virtual host name. 755 * Field 0, the virtual host name, is special: 756 * it's already parsed off and will be strdup'ed 757 * later, after we know its canonical form. 758 */ 759 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 760 if (*cp != '-' && (cp = strdup(cp))) 761 switch (i) { 762 case 1: /* anon user permissions */ 763 anonuser = cp; 764 break; 765 case 2: /* statistics file */ 766 statfile = cp; 767 break; 768 case 3: /* welcome message */ 769 welcome = cp; 770 break; 771 case 4: /* login message */ 772 loginmsg = cp; 773 break; 774 default: /* programming error */ 775 abort(); 776 /* NOTREACHED */ 777 } 778 779 hints.ai_flags = AI_PASSIVE; 780 hints.ai_family = family; 781 hints.ai_socktype = SOCK_STREAM; 782 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 783 goto nextline; 784 for (ai = res; ai != NULL && ai->ai_addr != NULL; 785 ai = ai->ai_next) { 786 787 gothost = 0; 788 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 789 struct addrinfo *hi; 790 791 for (hi = hrp->hostinfo; hi != NULL; 792 hi = hi->ai_next) 793 if (hi->ai_addrlen == ai->ai_addrlen && 794 memcmp(hi->ai_addr, 795 ai->ai_addr, 796 ai->ai_addr->sa_len) == 0) { 797 gothost++; 798 break; 799 } 800 if (gothost) 801 break; 802 } 803 if (hrp == NULL) { 804 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 805 goto nextline; 806 hrp->hostname = NULL; 807 insert = 1; 808 } else { 809 if (hrp->hostinfo && hrp->hostinfo != res) 810 freeaddrinfo(hrp->hostinfo); 811 insert = 0; /* host already in the chain */ 812 } 813 hrp->hostinfo = res; 814 815 /* 816 * determine hostname to use. 817 * force defined name if there is a valid alias 818 * otherwise fallback to primary hostname 819 */ 820 /* XXX: getaddrinfo() can't do alias check */ 821 switch(hrp->hostinfo->ai_family) { 822 case AF_INET: 823 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 824 addrsize = sizeof(struct in_addr); 825 break; 826 case AF_INET6: 827 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 828 addrsize = sizeof(struct in6_addr); 829 break; 830 default: 831 /* should not reach here */ 832 freeaddrinfo(hrp->hostinfo); 833 if (insert) 834 free(hrp); /*not in chain, can free*/ 835 else 836 hrp->hostinfo = NULL; /*mark as blank*/ 837 goto nextline; 838 /* NOTREACHED */ 839 } 840 if ((hp = getipnodebyaddr(addr, addrsize, 841 hrp->hostinfo->ai_family, 842 &hp_error)) != NULL) { 843 if (strcmp(vhost, hp->h_name) != 0) { 844 if (hp->h_aliases == NULL) 845 vhost = hp->h_name; 846 else { 847 i = 0; 848 while (hp->h_aliases[i] && 849 strcmp(vhost, hp->h_aliases[i]) != 0) 850 ++i; 851 if (hp->h_aliases[i] == NULL) 852 vhost = hp->h_name; 853 } 854 } 855 } 856 if (hrp->hostname && 857 strcmp(hrp->hostname, vhost) != 0) { 858 free(hrp->hostname); 859 hrp->hostname = NULL; 860 } 861 if (hrp->hostname == NULL && 862 (hrp->hostname = strdup(vhost)) == NULL) { 863 freeaddrinfo(hrp->hostinfo); 864 hrp->hostinfo = NULL; /* mark as blank */ 865 if (hp) 866 freehostent(hp); 867 goto nextline; 868 } 869 hrp->anonuser = anonuser; 870 hrp->statfile = statfile; 871 hrp->welcome = welcome; 872 hrp->loginmsg = loginmsg; 873 if (insert) { 874 hrp->next = NULL; 875 lhrp->next = hrp; 876 lhrp = hrp; 877 } 878 if (hp) 879 freehostent(hp); 880 } 881 nextline: 882 if (mp) 883 free(mp); 884 } 885 (void) fclose(fp); 886 } 887 } 888 889 static void 890 selecthost(union sockunion *su) 891 { 892 struct ftphost *hrp; 893 u_int16_t port; 894 #ifdef INET6 895 struct in6_addr *mapped_in6 = NULL; 896 #endif 897 struct addrinfo *hi; 898 899 #ifdef INET6 900 /* 901 * XXX IPv4 mapped IPv6 addr consideraton, 902 * specified in rfc2373. 903 */ 904 if (su->su_family == AF_INET6 && 905 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 906 mapped_in6 = &su->su_sin6.sin6_addr; 907 #endif 908 909 hrp = thishost = firsthost; /* default */ 910 port = su->su_port; 911 su->su_port = 0; 912 while (hrp != NULL) { 913 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 914 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 915 thishost = hrp; 916 goto found; 917 } 918 #ifdef INET6 919 /* XXX IPv4 mapped IPv6 addr consideraton */ 920 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 921 (memcmp(&mapped_in6->s6_addr[12], 922 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 923 sizeof(struct in_addr)) == 0)) { 924 thishost = hrp; 925 goto found; 926 } 927 #endif 928 } 929 hrp = hrp->next; 930 } 931 found: 932 su->su_port = port; 933 /* setup static variables as appropriate */ 934 hostname = thishost->hostname; 935 ftpuser = thishost->anonuser; 936 } 937 #endif 938 939 /* 940 * Helper function for sgetpwnam(). 941 */ 942 static char * 943 sgetsave(char *s) 944 { 945 char *new = malloc(strlen(s) + 1); 946 947 if (new == NULL) { 948 reply(421, "Ran out of memory."); 949 dologout(1); 950 /* NOTREACHED */ 951 } 952 (void) strcpy(new, s); 953 return (new); 954 } 955 956 /* 957 * Save the result of a getpwnam. Used for USER command, since 958 * the data returned must not be clobbered by any other command 959 * (e.g., globbing). 960 * NB: The data returned by sgetpwnam() will remain valid until 961 * the next call to this function. Its difference from getpwnam() 962 * is that sgetpwnam() is known to be called from ftpd code only. 963 */ 964 static struct passwd * 965 sgetpwnam(char *name) 966 { 967 static struct passwd save; 968 struct passwd *p; 969 970 if ((p = getpwnam(name)) == NULL) 971 return (p); 972 if (save.pw_name) { 973 free(save.pw_name); 974 free(save.pw_passwd); 975 free(save.pw_class); 976 free(save.pw_gecos); 977 free(save.pw_dir); 978 free(save.pw_shell); 979 } 980 save = *p; 981 save.pw_name = sgetsave(p->pw_name); 982 save.pw_passwd = sgetsave(p->pw_passwd); 983 save.pw_class = sgetsave(p->pw_class); 984 save.pw_gecos = sgetsave(p->pw_gecos); 985 save.pw_dir = sgetsave(p->pw_dir); 986 save.pw_shell = sgetsave(p->pw_shell); 987 return (&save); 988 } 989 990 static int login_attempts; /* number of failed login attempts */ 991 static int askpasswd; /* had user command, ask for passwd */ 992 static char curname[MAXLOGNAME]; /* current USER name */ 993 994 /* 995 * USER command. 996 * Sets global passwd pointer pw if named account exists and is acceptable; 997 * sets askpasswd if a PASS command is expected. If logged in previously, 998 * need to reset state. If name is "ftp" or "anonymous", the name is not in 999 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 1000 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 1001 * requesting login privileges. Disallow anyone who does not have a standard 1002 * shell as returned by getusershell(). Disallow anyone mentioned in the file 1003 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 1004 */ 1005 void 1006 user(char *name) 1007 { 1008 int ecode; 1009 char *cp, *shell; 1010 1011 if (logged_in) { 1012 if (guest) { 1013 reply(530, "Can't change user from guest login."); 1014 return; 1015 } else if (dochroot) { 1016 reply(530, "Can't change user from chroot user."); 1017 return; 1018 } 1019 end_login(); 1020 } 1021 1022 guest = 0; 1023 #ifdef VIRTUAL_HOSTING 1024 pw = sgetpwnam(thishost->anonuser); 1025 #else 1026 pw = sgetpwnam("ftp"); 1027 #endif 1028 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1029 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL, &ecode) || 1030 (ecode != 0 && ecode != ENOENT)) 1031 reply(530, "User %s access denied.", name); 1032 else if (checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL, &ecode) || 1033 (ecode != 0 && ecode != ENOENT)) 1034 reply(530, "User %s access denied.", name); 1035 else if (pw != NULL) { 1036 guest = 1; 1037 askpasswd = 1; 1038 reply(331, 1039 "Guest login ok, send your email address as password."); 1040 } else 1041 reply(530, "User %s unknown.", name); 1042 if (!askpasswd && logging) 1043 syslog(LOG_NOTICE, 1044 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1045 return; 1046 } 1047 if (anon_only != 0) { 1048 reply(530, "Sorry, only anonymous ftp allowed."); 1049 return; 1050 } 1051 1052 if ((pw = sgetpwnam(name))) { 1053 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1054 shell = _PATH_BSHELL; 1055 setusershell(); 1056 while ((cp = getusershell()) != NULL) 1057 if (strcmp(cp, shell) == 0) 1058 break; 1059 endusershell(); 1060 1061 if (cp == NULL || 1062 (checkuser(_PATH_FTPUSERS, name, 1, NULL, &ecode) || 1063 (ecode != 0 && ecode != ENOENT))) { 1064 reply(530, "User %s access denied.", name); 1065 if (logging) 1066 syslog(LOG_NOTICE, 1067 "FTP LOGIN REFUSED FROM %s, %s", 1068 remotehost, name); 1069 pw = NULL; 1070 return; 1071 } 1072 } 1073 if (logging) 1074 strncpy(curname, name, sizeof(curname)-1); 1075 1076 pwok = 0; 1077 #ifdef USE_PAM 1078 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1079 #endif 1080 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1081 pwok = (pw != NULL) && 1082 opieaccessfile(remotehost) && 1083 opiealways(pw->pw_dir); 1084 reply(331, "Response to %s %s for %s.", 1085 opieprompt, pwok ? "requested" : "required", name); 1086 } else { 1087 pwok = 1; 1088 reply(331, "Password required for %s.", name); 1089 } 1090 askpasswd = 1; 1091 /* 1092 * Delay before reading passwd after first failed 1093 * attempt to slow down passwd-guessing programs. 1094 */ 1095 if (login_attempts) 1096 sleep(login_attempts); 1097 } 1098 1099 /* 1100 * Check if a user is in the file "fname", 1101 * return a pointer to a malloc'd string with the rest 1102 * of the matching line in "residue" if not NULL. 1103 */ 1104 static int 1105 checkuser(char *fname, char *name, int pwset, char **residue, int *ecode) 1106 { 1107 FILE *fd; 1108 int found = 0; 1109 size_t len; 1110 char *line, *mp, *p; 1111 1112 if (ecode != NULL) 1113 *ecode = 0; 1114 if ((fd = fopen(fname, "r")) != NULL) { 1115 while (!found && (line = fgetln(fd, &len)) != NULL) { 1116 /* skip comments */ 1117 if (line[0] == '#') 1118 continue; 1119 if (line[len - 1] == '\n') { 1120 line[len - 1] = '\0'; 1121 mp = NULL; 1122 } else { 1123 if ((mp = malloc(len + 1)) == NULL) 1124 fatalerror("Ran out of memory."); 1125 memcpy(mp, line, len); 1126 mp[len] = '\0'; 1127 line = mp; 1128 } 1129 /* avoid possible leading and trailing whitespace */ 1130 p = strtok(line, " \t"); 1131 /* skip empty lines */ 1132 if (p == NULL) 1133 goto nextline; 1134 /* 1135 * if first chr is '@', check group membership 1136 */ 1137 if (p[0] == '@') { 1138 int i = 0; 1139 struct group *grp; 1140 1141 if (p[1] == '\0') /* single @ matches anyone */ 1142 found = 1; 1143 else { 1144 if ((grp = getgrnam(p+1)) == NULL) 1145 goto nextline; 1146 /* 1147 * Check user's default group 1148 */ 1149 if (pwset && grp->gr_gid == pw->pw_gid) 1150 found = 1; 1151 /* 1152 * Check supplementary groups 1153 */ 1154 while (!found && grp->gr_mem[i]) 1155 found = strcmp(name, 1156 grp->gr_mem[i++]) 1157 == 0; 1158 } 1159 } 1160 /* 1161 * Otherwise, just check for username match 1162 */ 1163 else 1164 found = strcmp(p, name) == 0; 1165 /* 1166 * Save the rest of line to "residue" if matched 1167 */ 1168 if (found && residue) { 1169 if ((p = strtok(NULL, "")) != NULL) 1170 p += strspn(p, " \t"); 1171 if (p && *p) { 1172 if ((*residue = strdup(p)) == NULL) 1173 fatalerror("Ran out of memory."); 1174 } else 1175 *residue = NULL; 1176 } 1177 nextline: 1178 if (mp) 1179 free(mp); 1180 } 1181 (void) fclose(fd); 1182 } else if (ecode != NULL) 1183 *ecode = errno; 1184 return (found); 1185 } 1186 1187 /* 1188 * Terminate login as previous user, if any, resetting state; 1189 * used when USER command is given or login fails. 1190 */ 1191 static void 1192 end_login(void) 1193 { 1194 #ifdef USE_PAM 1195 int e; 1196 #endif 1197 1198 (void) seteuid(0); 1199 if (logged_in && dowtmp) 1200 ftpd_logwtmp(wtmpid, NULL, NULL); 1201 pw = NULL; 1202 #ifdef LOGIN_CAP 1203 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 1204 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 1205 LOGIN_SETENV)); 1206 #endif 1207 #ifdef USE_PAM 1208 if (pamh) { 1209 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1210 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1211 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1212 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1213 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1214 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1215 pamh = NULL; 1216 } 1217 #endif 1218 logged_in = 0; 1219 guest = 0; 1220 dochroot = 0; 1221 } 1222 1223 #ifdef USE_PAM 1224 1225 /* 1226 * the following code is stolen from imap-uw PAM authentication module and 1227 * login.c 1228 */ 1229 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1230 1231 struct cred_t { 1232 const char *uname; /* user name */ 1233 const char *pass; /* password */ 1234 }; 1235 typedef struct cred_t cred_t; 1236 1237 static int 1238 auth_conv(int num_msg, const struct pam_message **msg, 1239 struct pam_response **resp, void *appdata) 1240 { 1241 int i; 1242 cred_t *cred = (cred_t *) appdata; 1243 struct pam_response *reply; 1244 1245 reply = calloc(num_msg, sizeof *reply); 1246 if (reply == NULL) 1247 return PAM_BUF_ERR; 1248 1249 for (i = 0; i < num_msg; i++) { 1250 switch (msg[i]->msg_style) { 1251 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1252 reply[i].resp_retcode = PAM_SUCCESS; 1253 reply[i].resp = COPY_STRING(cred->uname); 1254 /* PAM frees resp. */ 1255 break; 1256 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1257 reply[i].resp_retcode = PAM_SUCCESS; 1258 reply[i].resp = COPY_STRING(cred->pass); 1259 /* PAM frees resp. */ 1260 break; 1261 case PAM_TEXT_INFO: 1262 case PAM_ERROR_MSG: 1263 reply[i].resp_retcode = PAM_SUCCESS; 1264 reply[i].resp = NULL; 1265 break; 1266 default: /* unknown message style */ 1267 free(reply); 1268 return PAM_CONV_ERR; 1269 } 1270 } 1271 1272 *resp = reply; 1273 return PAM_SUCCESS; 1274 } 1275 1276 /* 1277 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1278 * authenticated, or 1 if not authenticated. If some sort of PAM system 1279 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1280 * function returns -1. This can be used as an indication that we should 1281 * fall back to a different authentication mechanism. 1282 */ 1283 static int 1284 auth_pam(struct passwd **ppw, const char *pass) 1285 { 1286 const char *tmpl_user; 1287 const void *item; 1288 int rval; 1289 int e; 1290 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1291 struct pam_conv conv = { &auth_conv, &auth_cred }; 1292 1293 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1294 if (e != PAM_SUCCESS) { 1295 /* 1296 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1297 * if context creation has failed in the first place. 1298 */ 1299 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1300 return -1; 1301 } 1302 1303 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1304 if (e != PAM_SUCCESS) { 1305 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1306 pam_strerror(pamh, e)); 1307 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1308 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1309 } 1310 pamh = NULL; 1311 return -1; 1312 } 1313 1314 e = pam_authenticate(pamh, 0); 1315 switch (e) { 1316 case PAM_SUCCESS: 1317 /* 1318 * With PAM we support the concept of a "template" 1319 * user. The user enters a login name which is 1320 * authenticated by PAM, usually via a remote service 1321 * such as RADIUS or TACACS+. If authentication 1322 * succeeds, a different but related "template" name 1323 * is used for setting the credentials, shell, and 1324 * home directory. The name the user enters need only 1325 * exist on the remote authentication server, but the 1326 * template name must be present in the local password 1327 * database. 1328 * 1329 * This is supported by two various mechanisms in the 1330 * individual modules. However, from the application's 1331 * point of view, the template user is always passed 1332 * back as a changed value of the PAM_USER item. 1333 */ 1334 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1335 PAM_SUCCESS) { 1336 tmpl_user = (const char *) item; 1337 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1338 *ppw = getpwnam(tmpl_user); 1339 } else 1340 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1341 pam_strerror(pamh, e)); 1342 rval = 0; 1343 break; 1344 1345 case PAM_AUTH_ERR: 1346 case PAM_USER_UNKNOWN: 1347 case PAM_MAXTRIES: 1348 rval = 1; 1349 break; 1350 1351 default: 1352 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1353 rval = -1; 1354 break; 1355 } 1356 1357 if (rval == 0) { 1358 e = pam_acct_mgmt(pamh, 0); 1359 if (e != PAM_SUCCESS) { 1360 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1361 pam_strerror(pamh, e)); 1362 rval = 1; 1363 } 1364 } 1365 1366 if (rval != 0) { 1367 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1368 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1369 } 1370 pamh = NULL; 1371 } 1372 return rval; 1373 } 1374 1375 #endif /* USE_PAM */ 1376 1377 void 1378 pass(char *passwd) 1379 { 1380 int rval, ecode; 1381 FILE *fd; 1382 #ifdef LOGIN_CAP 1383 login_cap_t *lc = NULL; 1384 #endif 1385 #ifdef USE_PAM 1386 int e; 1387 #endif 1388 char *residue = NULL; 1389 char *xpasswd; 1390 1391 if (logged_in || askpasswd == 0) { 1392 reply(503, "Login with USER first."); 1393 return; 1394 } 1395 askpasswd = 0; 1396 if (!guest) { /* "ftp" is only account allowed no password */ 1397 if (pw == NULL) { 1398 rval = 1; /* failure below */ 1399 goto skip; 1400 } 1401 #ifdef USE_PAM 1402 rval = auth_pam(&pw, passwd); 1403 if (rval >= 0) { 1404 opieunlock(); 1405 goto skip; 1406 } 1407 #endif 1408 if (opieverify(&opiedata, passwd) == 0) 1409 xpasswd = pw->pw_passwd; 1410 else if (pwok) { 1411 xpasswd = crypt(passwd, pw->pw_passwd); 1412 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1413 xpasswd = ":"; 1414 } else { 1415 rval = 1; 1416 goto skip; 1417 } 1418 rval = strcmp(pw->pw_passwd, xpasswd); 1419 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1420 rval = 1; /* failure */ 1421 skip: 1422 /* 1423 * If rval == 1, the user failed the authentication check 1424 * above. If rval == 0, either PAM or local authentication 1425 * succeeded. 1426 */ 1427 if (rval) { 1428 reply(530, "Login incorrect."); 1429 BLACKLIST_NOTIFY(BLACKLIST_AUTH_FAIL, STDIN_FILENO, "Login incorrect"); 1430 if (logging) { 1431 syslog(LOG_NOTICE, 1432 "FTP LOGIN FAILED FROM %s", 1433 remotehost); 1434 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1435 "FTP LOGIN FAILED FROM %s, %s", 1436 remotehost, curname); 1437 } 1438 pw = NULL; 1439 if (login_attempts++ >= 5) { 1440 syslog(LOG_NOTICE, 1441 "repeated login failures from %s", 1442 remotehost); 1443 exit(0); 1444 } 1445 return; 1446 } else { 1447 BLACKLIST_NOTIFY(BLACKLIST_AUTH_OK, STDIN_FILENO, "Login successful"); 1448 } 1449 } 1450 login_attempts = 0; /* this time successful */ 1451 if (setegid(pw->pw_gid) < 0) { 1452 reply(550, "Can't set gid."); 1453 return; 1454 } 1455 /* May be overridden by login.conf */ 1456 (void) umask(defumask); 1457 #ifdef LOGIN_CAP 1458 if ((lc = login_getpwclass(pw)) != NULL) { 1459 char remote_ip[NI_MAXHOST]; 1460 1461 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1462 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1463 NI_NUMERICHOST)) 1464 *remote_ip = 0; 1465 remote_ip[sizeof(remote_ip) - 1] = 0; 1466 if (!auth_hostok(lc, remotehost, remote_ip)) { 1467 syslog(LOG_INFO|LOG_AUTH, 1468 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1469 pw->pw_name); 1470 reply(530, "Permission denied."); 1471 pw = NULL; 1472 return; 1473 } 1474 if (!auth_timeok(lc, time(NULL))) { 1475 reply(530, "Login not available right now."); 1476 pw = NULL; 1477 return; 1478 } 1479 } 1480 setusercontext(lc, pw, 0, LOGIN_SETALL & 1481 ~(LOGIN_SETUSER | LOGIN_SETPATH | LOGIN_SETENV)); 1482 #else 1483 setlogin(pw->pw_name); 1484 (void) initgroups(pw->pw_name, pw->pw_gid); 1485 #endif 1486 1487 #ifdef USE_PAM 1488 if (pamh) { 1489 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1490 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1491 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1492 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1493 } 1494 } 1495 #endif 1496 1497 dochroot = 1498 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue, &ecode) 1499 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1500 || login_getcapbool(lc, "ftp-chroot", 0) 1501 #endif 1502 ; 1503 /* 1504 * It is possible that checkuser() failed to open the chroot file. 1505 * If this is the case, report that logins are un-available, since we 1506 * have no way of checking whether or not the user should be chrooted. 1507 * We ignore ENOENT since it is not required that this file be present. 1508 */ 1509 if (ecode != 0 && ecode != ENOENT) { 1510 reply(530, "Login not available right now."); 1511 return; 1512 } 1513 chrootdir = NULL; 1514 1515 /* Disable wtmp logging when chrooting. */ 1516 if (dochroot || guest) 1517 dowtmp = 0; 1518 if (dowtmp) 1519 ftpd_logwtmp(wtmpid, pw->pw_name, 1520 (struct sockaddr *)&his_addr); 1521 logged_in = 1; 1522 1523 if (guest && stats && statfd < 0) 1524 #ifdef VIRTUAL_HOSTING 1525 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1526 #else 1527 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1528 #endif 1529 if (statfd < 0) 1530 stats = 0; 1531 1532 /* 1533 * For a chrooted local user, 1534 * a) see whether ftpchroot(5) specifies a chroot directory, 1535 * b) extract the directory pathname from the line, 1536 * c) expand it to the absolute pathname if necessary. 1537 */ 1538 if (dochroot && residue && 1539 (chrootdir = strtok(residue, " \t")) != NULL) { 1540 if (chrootdir[0] != '/') 1541 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1542 else 1543 chrootdir = strdup(chrootdir); /* make it permanent */ 1544 if (chrootdir == NULL) 1545 fatalerror("Ran out of memory."); 1546 } 1547 if (guest || dochroot) { 1548 /* 1549 * If no chroot directory set yet, use the login directory. 1550 * Copy it so it can be modified while pw->pw_dir stays intact. 1551 */ 1552 if (chrootdir == NULL && 1553 (chrootdir = strdup(pw->pw_dir)) == NULL) 1554 fatalerror("Ran out of memory."); 1555 /* 1556 * Check for the "/chroot/./home" syntax, 1557 * separate the chroot and home directory pathnames. 1558 */ 1559 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1560 *(homedir++) = '\0'; /* wipe '/' */ 1561 homedir++; /* skip '.' */ 1562 } else { 1563 /* 1564 * We MUST do a chdir() after the chroot. Otherwise 1565 * the old current directory will be accessible as "." 1566 * outside the new root! 1567 */ 1568 homedir = "/"; 1569 } 1570 /* 1571 * Finally, do chroot() 1572 */ 1573 if (chroot(chrootdir) < 0) { 1574 reply(550, "Can't change root."); 1575 goto bad; 1576 } 1577 __FreeBSD_libc_enter_restricted_mode(); 1578 } else /* real user w/o chroot */ 1579 homedir = pw->pw_dir; 1580 /* 1581 * Set euid *before* doing chdir() so 1582 * a) the user won't be carried to a directory that he couldn't reach 1583 * on his own due to no permission to upper path components, 1584 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1585 * (uid 0 has no root power over NFS if not mapped explicitly.) 1586 */ 1587 if (seteuid(pw->pw_uid) < 0) { 1588 reply(550, "Can't set uid."); 1589 goto bad; 1590 } 1591 if (chdir(homedir) < 0) { 1592 if (guest || dochroot) { 1593 reply(550, "Can't change to base directory."); 1594 goto bad; 1595 } else { 1596 if (chdir("/") < 0) { 1597 reply(550, "Root is inaccessible."); 1598 goto bad; 1599 } 1600 lreply(230, "No directory! Logging in with home=/."); 1601 } 1602 } 1603 1604 /* 1605 * Display a login message, if it exists. 1606 * N.B. reply(230,) must follow the message. 1607 */ 1608 #ifdef VIRTUAL_HOSTING 1609 fd = fopen(thishost->loginmsg, "r"); 1610 #else 1611 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1612 #endif 1613 if (fd != NULL) { 1614 char *cp, line[LINE_MAX]; 1615 1616 while (fgets(line, sizeof(line), fd) != NULL) { 1617 if ((cp = strchr(line, '\n')) != NULL) 1618 *cp = '\0'; 1619 lreply(230, "%s", line); 1620 } 1621 (void) fflush(stdout); 1622 (void) fclose(fd); 1623 } 1624 if (guest) { 1625 if (ident != NULL) 1626 free(ident); 1627 ident = strdup(passwd); 1628 if (ident == NULL) 1629 fatalerror("Ran out of memory."); 1630 1631 reply(230, "Guest login ok, access restrictions apply."); 1632 #ifdef SETPROCTITLE 1633 #ifdef VIRTUAL_HOSTING 1634 if (thishost != firsthost) 1635 snprintf(proctitle, sizeof(proctitle), 1636 "%s: anonymous(%s)/%s", remotehost, hostname, 1637 passwd); 1638 else 1639 #endif 1640 snprintf(proctitle, sizeof(proctitle), 1641 "%s: anonymous/%s", remotehost, passwd); 1642 setproctitle("%s", proctitle); 1643 #endif /* SETPROCTITLE */ 1644 if (logging) 1645 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1646 remotehost, passwd); 1647 } else { 1648 if (dochroot) 1649 reply(230, "User %s logged in, " 1650 "access restrictions apply.", pw->pw_name); 1651 else 1652 reply(230, "User %s logged in.", pw->pw_name); 1653 1654 #ifdef SETPROCTITLE 1655 snprintf(proctitle, sizeof(proctitle), 1656 "%s: user/%s", remotehost, pw->pw_name); 1657 setproctitle("%s", proctitle); 1658 #endif /* SETPROCTITLE */ 1659 if (logging) 1660 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1661 remotehost, pw->pw_name); 1662 } 1663 if (logging && (guest || dochroot)) 1664 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1665 #ifdef LOGIN_CAP 1666 login_close(lc); 1667 #endif 1668 if (residue) 1669 free(residue); 1670 return; 1671 bad: 1672 /* Forget all about it... */ 1673 #ifdef LOGIN_CAP 1674 login_close(lc); 1675 #endif 1676 if (residue) 1677 free(residue); 1678 end_login(); 1679 } 1680 1681 void 1682 retrieve(char *cmd, char *name) 1683 { 1684 FILE *fin, *dout; 1685 struct stat st; 1686 int (*closefunc)(FILE *); 1687 time_t start; 1688 char line[BUFSIZ]; 1689 1690 if (cmd == 0) { 1691 fin = fopen(name, "r"), closefunc = fclose; 1692 st.st_size = 0; 1693 } else { 1694 (void) snprintf(line, sizeof(line), cmd, name); 1695 name = line; 1696 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1697 st.st_size = -1; 1698 st.st_blksize = BUFSIZ; 1699 } 1700 if (fin == NULL) { 1701 if (errno != 0) { 1702 perror_reply(550, name); 1703 if (cmd == 0) { 1704 LOGCMD("get", name); 1705 } 1706 } 1707 return; 1708 } 1709 byte_count = -1; 1710 if (cmd == 0) { 1711 if (fstat(fileno(fin), &st) < 0) { 1712 perror_reply(550, name); 1713 goto done; 1714 } 1715 if (!S_ISREG(st.st_mode)) { 1716 /* 1717 * Never sending a raw directory is a workaround 1718 * for buggy clients that will attempt to RETR 1719 * a directory before listing it, e.g., Mozilla. 1720 * Preventing a guest from getting irregular files 1721 * is a simple security measure. 1722 */ 1723 if (S_ISDIR(st.st_mode) || guest) { 1724 reply(550, "%s: not a plain file.", name); 1725 goto done; 1726 } 1727 st.st_size = -1; 1728 /* st.st_blksize is set for all descriptor types */ 1729 } 1730 } 1731 if (restart_point) { 1732 if (type == TYPE_A) { 1733 off_t i, n; 1734 int c; 1735 1736 n = restart_point; 1737 i = 0; 1738 while (i++ < n) { 1739 if ((c=getc(fin)) == EOF) { 1740 perror_reply(550, name); 1741 goto done; 1742 } 1743 if (c == '\n') 1744 i++; 1745 } 1746 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1747 perror_reply(550, name); 1748 goto done; 1749 } 1750 } 1751 dout = dataconn(name, st.st_size, "w"); 1752 if (dout == NULL) 1753 goto done; 1754 time(&start); 1755 send_data(fin, dout, st.st_blksize, st.st_size, 1756 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1757 if (cmd == 0 && guest && stats && byte_count > 0) 1758 logxfer(name, byte_count, start); 1759 (void) fclose(dout); 1760 data = -1; 1761 pdata = -1; 1762 done: 1763 if (cmd == 0) 1764 LOGBYTES("get", name, byte_count); 1765 (*closefunc)(fin); 1766 } 1767 1768 void 1769 store(char *name, char *mode, int unique) 1770 { 1771 int fd; 1772 FILE *fout, *din; 1773 int (*closefunc)(FILE *); 1774 1775 if (*mode == 'a') { /* APPE */ 1776 if (unique) { 1777 /* Programming error */ 1778 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1779 unique = 0; 1780 } 1781 if (guest && noguestmod) { 1782 reply(550, "Appending to existing file denied."); 1783 goto err; 1784 } 1785 restart_point = 0; /* not affected by preceding REST */ 1786 } 1787 if (unique) /* STOU overrides REST */ 1788 restart_point = 0; 1789 if (guest && noguestmod) { 1790 if (restart_point) { /* guest STOR w/REST */ 1791 reply(550, "Modifying existing file denied."); 1792 goto err; 1793 } else /* treat guest STOR as STOU */ 1794 unique = 1; 1795 } 1796 1797 if (restart_point) 1798 mode = "r+"; /* so ASCII manual seek can work */ 1799 if (unique) { 1800 if ((fd = guniquefd(name, &name)) < 0) 1801 goto err; 1802 fout = fdopen(fd, mode); 1803 } else 1804 fout = fopen(name, mode); 1805 closefunc = fclose; 1806 if (fout == NULL) { 1807 perror_reply(553, name); 1808 goto err; 1809 } 1810 byte_count = -1; 1811 if (restart_point) { 1812 if (type == TYPE_A) { 1813 off_t i, n; 1814 int c; 1815 1816 n = restart_point; 1817 i = 0; 1818 while (i++ < n) { 1819 if ((c=getc(fout)) == EOF) { 1820 perror_reply(550, name); 1821 goto done; 1822 } 1823 if (c == '\n') 1824 i++; 1825 } 1826 /* 1827 * We must do this seek to "current" position 1828 * because we are changing from reading to 1829 * writing. 1830 */ 1831 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1832 perror_reply(550, name); 1833 goto done; 1834 } 1835 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1836 perror_reply(550, name); 1837 goto done; 1838 } 1839 } 1840 din = dataconn(name, -1, "r"); 1841 if (din == NULL) 1842 goto done; 1843 if (receive_data(din, fout) == 0) { 1844 if (unique) 1845 reply(226, "Transfer complete (unique file name:%s).", 1846 name); 1847 else 1848 reply(226, "Transfer complete."); 1849 } 1850 (void) fclose(din); 1851 data = -1; 1852 pdata = -1; 1853 done: 1854 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1855 (*closefunc)(fout); 1856 return; 1857 err: 1858 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1859 return; 1860 } 1861 1862 static FILE * 1863 getdatasock(char *mode) 1864 { 1865 int on = 1, s, t, tries; 1866 1867 if (data >= 0) 1868 return (fdopen(data, mode)); 1869 1870 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1871 if (s < 0) 1872 goto bad; 1873 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1874 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1875 /* anchor socket to avoid multi-homing problems */ 1876 data_source = ctrl_addr; 1877 data_source.su_port = htons(dataport); 1878 (void) seteuid(0); 1879 for (tries = 1; ; tries++) { 1880 /* 1881 * We should loop here since it's possible that 1882 * another ftpd instance has passed this point and is 1883 * trying to open a data connection in active mode now. 1884 * Until the other connection is opened, we'll be getting 1885 * EADDRINUSE because no SOCK_STREAM sockets in the system 1886 * can share both local and remote addresses, localIP:20 1887 * and *:* in this case. 1888 */ 1889 if (bind(s, (struct sockaddr *)&data_source, 1890 data_source.su_len) >= 0) 1891 break; 1892 if (errno != EADDRINUSE || tries > 10) 1893 goto bad; 1894 sleep(tries); 1895 } 1896 (void) seteuid(pw->pw_uid); 1897 #ifdef IP_TOS 1898 if (data_source.su_family == AF_INET) 1899 { 1900 on = IPTOS_THROUGHPUT; 1901 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1902 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1903 } 1904 #endif 1905 #ifdef TCP_NOPUSH 1906 /* 1907 * Turn off push flag to keep sender TCP from sending short packets 1908 * at the boundaries of each write(). 1909 */ 1910 on = 1; 1911 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1912 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1913 #endif 1914 return (fdopen(s, mode)); 1915 bad: 1916 /* Return the real value of errno (close may change it) */ 1917 t = errno; 1918 (void) seteuid(pw->pw_uid); 1919 (void) close(s); 1920 errno = t; 1921 return (NULL); 1922 } 1923 1924 static FILE * 1925 dataconn(char *name, off_t size, char *mode) 1926 { 1927 char sizebuf[32]; 1928 FILE *file; 1929 int retry = 0, tos, conerrno; 1930 1931 file_size = size; 1932 byte_count = 0; 1933 if (size != -1) 1934 (void) snprintf(sizebuf, sizeof(sizebuf), 1935 " (%jd bytes)", (intmax_t)size); 1936 else 1937 *sizebuf = '\0'; 1938 if (pdata >= 0) { 1939 union sockunion from; 1940 socklen_t fromlen = ctrl_addr.su_len; 1941 int flags, s; 1942 struct timeval timeout; 1943 fd_set set; 1944 1945 FD_ZERO(&set); 1946 FD_SET(pdata, &set); 1947 1948 timeout.tv_usec = 0; 1949 timeout.tv_sec = 120; 1950 1951 /* 1952 * Granted a socket is in the blocking I/O mode, 1953 * accept() will block after a successful select() 1954 * if the selected connection dies in between. 1955 * Therefore set the non-blocking I/O flag here. 1956 */ 1957 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1958 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1959 goto pdata_err; 1960 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1961 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1962 goto pdata_err; 1963 (void) close(pdata); 1964 pdata = s; 1965 /* 1966 * Unset the inherited non-blocking I/O flag 1967 * on the child socket so stdio can work on it. 1968 */ 1969 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1970 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1971 goto pdata_err; 1972 #ifdef IP_TOS 1973 if (from.su_family == AF_INET) 1974 { 1975 tos = IPTOS_THROUGHPUT; 1976 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1977 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1978 } 1979 #endif 1980 reply(150, "Opening %s mode data connection for '%s'%s.", 1981 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1982 return (fdopen(pdata, mode)); 1983 pdata_err: 1984 reply(425, "Can't open data connection."); 1985 (void) close(pdata); 1986 pdata = -1; 1987 return (NULL); 1988 } 1989 if (data >= 0) { 1990 reply(125, "Using existing data connection for '%s'%s.", 1991 name, sizebuf); 1992 usedefault = 1; 1993 return (fdopen(data, mode)); 1994 } 1995 if (usedefault) 1996 data_dest = his_addr; 1997 usedefault = 1; 1998 do { 1999 file = getdatasock(mode); 2000 if (file == NULL) { 2001 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 2002 2003 if (getnameinfo((struct sockaddr *)&data_source, 2004 data_source.su_len, 2005 hostbuf, sizeof(hostbuf) - 1, 2006 portbuf, sizeof(portbuf) - 1, 2007 NI_NUMERICHOST|NI_NUMERICSERV)) 2008 *hostbuf = *portbuf = 0; 2009 hostbuf[sizeof(hostbuf) - 1] = 0; 2010 portbuf[sizeof(portbuf) - 1] = 0; 2011 reply(425, "Can't create data socket (%s,%s): %s.", 2012 hostbuf, portbuf, strerror(errno)); 2013 return (NULL); 2014 } 2015 data = fileno(file); 2016 conerrno = 0; 2017 if (connect(data, (struct sockaddr *)&data_dest, 2018 data_dest.su_len) == 0) 2019 break; 2020 conerrno = errno; 2021 (void) fclose(file); 2022 data = -1; 2023 if (conerrno == EADDRINUSE) { 2024 sleep(swaitint); 2025 retry += swaitint; 2026 } else { 2027 break; 2028 } 2029 } while (retry <= swaitmax); 2030 if (conerrno != 0) { 2031 reply(425, "Can't build data connection: %s.", 2032 strerror(conerrno)); 2033 return (NULL); 2034 } 2035 reply(150, "Opening %s mode data connection for '%s'%s.", 2036 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2037 return (file); 2038 } 2039 2040 /* 2041 * A helper macro to avoid code duplication 2042 * in send_data() and receive_data(). 2043 * 2044 * XXX We have to block SIGURG during putc() because BSD stdio 2045 * is unable to restart interrupted write operations and hence 2046 * the entire buffer contents will be lost as soon as a write() 2047 * call indicates EINTR to stdio. 2048 */ 2049 #define FTPD_PUTC(ch, file, label) \ 2050 do { \ 2051 int ret; \ 2052 \ 2053 do { \ 2054 START_UNSAFE; \ 2055 ret = putc((ch), (file)); \ 2056 END_UNSAFE; \ 2057 CHECKOOB(return (-1)) \ 2058 else if (ferror(file)) \ 2059 goto label; \ 2060 clearerr(file); \ 2061 } while (ret == EOF); \ 2062 } while (0) 2063 2064 /* 2065 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2066 * encapsulation of the data subject to Mode, Structure, and Type. 2067 * 2068 * NB: Form isn't handled. 2069 */ 2070 static int 2071 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2072 { 2073 int c, cp, filefd, netfd; 2074 char *buf; 2075 2076 STARTXFER; 2077 2078 switch (type) { 2079 2080 case TYPE_A: 2081 cp = EOF; 2082 for (;;) { 2083 c = getc(instr); 2084 CHECKOOB(return (-1)) 2085 else if (c == EOF && ferror(instr)) 2086 goto file_err; 2087 if (c == EOF) { 2088 if (ferror(instr)) { /* resume after OOB */ 2089 clearerr(instr); 2090 continue; 2091 } 2092 if (feof(instr)) /* EOF */ 2093 break; 2094 syslog(LOG_ERR, "Internal: impossible condition" 2095 " on file after getc()"); 2096 goto file_err; 2097 } 2098 if (c == '\n' && cp != '\r') { 2099 FTPD_PUTC('\r', outstr, data_err); 2100 byte_count++; 2101 } 2102 FTPD_PUTC(c, outstr, data_err); 2103 byte_count++; 2104 cp = c; 2105 } 2106 #ifdef notyet /* BSD stdio isn't ready for that */ 2107 while (fflush(outstr) == EOF) { 2108 CHECKOOB(return (-1)) 2109 else 2110 goto data_err; 2111 clearerr(outstr); 2112 } 2113 ENDXFER; 2114 #else 2115 ENDXFER; 2116 if (fflush(outstr) == EOF) 2117 goto data_err; 2118 #endif 2119 reply(226, "Transfer complete."); 2120 return (0); 2121 2122 case TYPE_I: 2123 case TYPE_L: 2124 /* 2125 * isreg is only set if we are not doing restart and we 2126 * are sending a regular file 2127 */ 2128 netfd = fileno(outstr); 2129 filefd = fileno(instr); 2130 2131 if (isreg) { 2132 char *msg = "Transfer complete."; 2133 off_t cnt, offset; 2134 int err; 2135 2136 cnt = offset = 0; 2137 2138 while (filesize > 0) { 2139 err = sendfile(filefd, netfd, offset, 0, 2140 NULL, &cnt, 0); 2141 /* 2142 * Calculate byte_count before OOB processing. 2143 * It can be used in myoob() later. 2144 */ 2145 byte_count += cnt; 2146 offset += cnt; 2147 filesize -= cnt; 2148 CHECKOOB(return (-1)) 2149 else if (err == -1) { 2150 if (errno != EINTR && 2151 cnt == 0 && offset == 0) 2152 goto oldway; 2153 goto data_err; 2154 } 2155 if (err == -1) /* resume after OOB */ 2156 continue; 2157 /* 2158 * We hit the EOF prematurely. 2159 * Perhaps the file was externally truncated. 2160 */ 2161 if (cnt == 0) { 2162 msg = "Transfer finished due to " 2163 "premature end of file."; 2164 break; 2165 } 2166 } 2167 ENDXFER; 2168 reply(226, "%s", msg); 2169 return (0); 2170 } 2171 2172 oldway: 2173 if ((buf = malloc(blksize)) == NULL) { 2174 ENDXFER; 2175 reply(451, "Ran out of memory."); 2176 return (-1); 2177 } 2178 2179 for (;;) { 2180 int cnt, len; 2181 char *bp; 2182 2183 cnt = read(filefd, buf, blksize); 2184 CHECKOOB(free(buf); return (-1)) 2185 else if (cnt < 0) { 2186 free(buf); 2187 goto file_err; 2188 } 2189 if (cnt < 0) /* resume after OOB */ 2190 continue; 2191 if (cnt == 0) /* EOF */ 2192 break; 2193 for (len = cnt, bp = buf; len > 0;) { 2194 cnt = write(netfd, bp, len); 2195 CHECKOOB(free(buf); return (-1)) 2196 else if (cnt < 0) { 2197 free(buf); 2198 goto data_err; 2199 } 2200 if (cnt <= 0) 2201 continue; 2202 len -= cnt; 2203 bp += cnt; 2204 byte_count += cnt; 2205 } 2206 } 2207 ENDXFER; 2208 free(buf); 2209 reply(226, "Transfer complete."); 2210 return (0); 2211 default: 2212 ENDXFER; 2213 reply(550, "Unimplemented TYPE %d in send_data.", type); 2214 return (-1); 2215 } 2216 2217 data_err: 2218 ENDXFER; 2219 perror_reply(426, "Data connection"); 2220 return (-1); 2221 2222 file_err: 2223 ENDXFER; 2224 perror_reply(551, "Error on input file"); 2225 return (-1); 2226 } 2227 2228 /* 2229 * Transfer data from peer to "outstr" using the appropriate encapulation of 2230 * the data subject to Mode, Structure, and Type. 2231 * 2232 * N.B.: Form isn't handled. 2233 */ 2234 static int 2235 receive_data(FILE *instr, FILE *outstr) 2236 { 2237 int c, cp; 2238 int bare_lfs = 0; 2239 2240 STARTXFER; 2241 2242 switch (type) { 2243 2244 case TYPE_I: 2245 case TYPE_L: 2246 for (;;) { 2247 int cnt, len; 2248 char *bp; 2249 char buf[BUFSIZ]; 2250 2251 cnt = read(fileno(instr), buf, sizeof(buf)); 2252 CHECKOOB(return (-1)) 2253 else if (cnt < 0) 2254 goto data_err; 2255 if (cnt < 0) /* resume after OOB */ 2256 continue; 2257 if (cnt == 0) /* EOF */ 2258 break; 2259 for (len = cnt, bp = buf; len > 0;) { 2260 cnt = write(fileno(outstr), bp, len); 2261 CHECKOOB(return (-1)) 2262 else if (cnt < 0) 2263 goto file_err; 2264 if (cnt <= 0) 2265 continue; 2266 len -= cnt; 2267 bp += cnt; 2268 byte_count += cnt; 2269 } 2270 } 2271 ENDXFER; 2272 return (0); 2273 2274 case TYPE_E: 2275 ENDXFER; 2276 reply(553, "TYPE E not implemented."); 2277 return (-1); 2278 2279 case TYPE_A: 2280 cp = EOF; 2281 for (;;) { 2282 c = getc(instr); 2283 CHECKOOB(return (-1)) 2284 else if (c == EOF && ferror(instr)) 2285 goto data_err; 2286 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2287 clearerr(instr); 2288 continue; 2289 } 2290 2291 if (cp == '\r') { 2292 if (c != '\n') 2293 FTPD_PUTC('\r', outstr, file_err); 2294 } else 2295 if (c == '\n') 2296 bare_lfs++; 2297 if (c == '\r') { 2298 byte_count++; 2299 cp = c; 2300 continue; 2301 } 2302 2303 /* Check for EOF here in order not to lose last \r. */ 2304 if (c == EOF) { 2305 if (feof(instr)) /* EOF */ 2306 break; 2307 syslog(LOG_ERR, "Internal: impossible condition" 2308 " on data stream after getc()"); 2309 goto data_err; 2310 } 2311 2312 byte_count++; 2313 FTPD_PUTC(c, outstr, file_err); 2314 cp = c; 2315 } 2316 #ifdef notyet /* BSD stdio isn't ready for that */ 2317 while (fflush(outstr) == EOF) { 2318 CHECKOOB(return (-1)) 2319 else 2320 goto file_err; 2321 clearerr(outstr); 2322 } 2323 ENDXFER; 2324 #else 2325 ENDXFER; 2326 if (fflush(outstr) == EOF) 2327 goto file_err; 2328 #endif 2329 if (bare_lfs) { 2330 lreply(226, 2331 "WARNING! %d bare linefeeds received in ASCII mode.", 2332 bare_lfs); 2333 (void)printf(" File may not have transferred correctly.\r\n"); 2334 } 2335 return (0); 2336 default: 2337 ENDXFER; 2338 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2339 return (-1); 2340 } 2341 2342 data_err: 2343 ENDXFER; 2344 perror_reply(426, "Data connection"); 2345 return (-1); 2346 2347 file_err: 2348 ENDXFER; 2349 perror_reply(452, "Error writing to file"); 2350 return (-1); 2351 } 2352 2353 void 2354 statfilecmd(char *filename) 2355 { 2356 FILE *fin; 2357 int atstart; 2358 int c, code; 2359 char line[LINE_MAX]; 2360 struct stat st; 2361 2362 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2363 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2364 fin = ftpd_popen(line, "r"); 2365 if (fin == NULL) { 2366 perror_reply(551, filename); 2367 return; 2368 } 2369 lreply(code, "Status of %s:", filename); 2370 atstart = 1; 2371 while ((c = getc(fin)) != EOF) { 2372 if (c == '\n') { 2373 if (ferror(stdout)){ 2374 perror_reply(421, "Control connection"); 2375 (void) ftpd_pclose(fin); 2376 dologout(1); 2377 /* NOTREACHED */ 2378 } 2379 if (ferror(fin)) { 2380 perror_reply(551, filename); 2381 (void) ftpd_pclose(fin); 2382 return; 2383 } 2384 (void) putc('\r', stdout); 2385 } 2386 /* 2387 * RFC 959 says neutral text should be prepended before 2388 * a leading 3-digit number followed by whitespace, but 2389 * many ftp clients can be confused by any leading digits, 2390 * as a matter of fact. 2391 */ 2392 if (atstart && isdigit(c)) 2393 (void) putc(' ', stdout); 2394 (void) putc(c, stdout); 2395 atstart = (c == '\n'); 2396 } 2397 (void) ftpd_pclose(fin); 2398 reply(code, "End of status."); 2399 } 2400 2401 void 2402 statcmd(void) 2403 { 2404 union sockunion *su; 2405 u_char *a, *p; 2406 char hname[NI_MAXHOST]; 2407 int ispassive; 2408 2409 if (hostinfo) { 2410 lreply(211, "%s FTP server status:", hostname); 2411 printf(" %s\r\n", version); 2412 } else 2413 lreply(211, "FTP server status:"); 2414 printf(" Connected to %s", remotehost); 2415 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2416 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2417 hname[sizeof(hname) - 1] = 0; 2418 if (strcmp(hname, remotehost) != 0) 2419 printf(" (%s)", hname); 2420 } 2421 printf("\r\n"); 2422 if (logged_in) { 2423 if (guest) 2424 printf(" Logged in anonymously\r\n"); 2425 else 2426 printf(" Logged in as %s\r\n", pw->pw_name); 2427 } else if (askpasswd) 2428 printf(" Waiting for password\r\n"); 2429 else 2430 printf(" Waiting for user name\r\n"); 2431 printf(" TYPE: %s", typenames[type]); 2432 if (type == TYPE_A || type == TYPE_E) 2433 printf(", FORM: %s", formnames[form]); 2434 if (type == TYPE_L) 2435 #if CHAR_BIT == 8 2436 printf(" %d", CHAR_BIT); 2437 #else 2438 printf(" %d", bytesize); /* need definition! */ 2439 #endif 2440 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2441 strunames[stru], modenames[mode]); 2442 if (data != -1) 2443 printf(" Data connection open\r\n"); 2444 else if (pdata != -1) { 2445 ispassive = 1; 2446 su = &pasv_addr; 2447 goto printaddr; 2448 } else if (usedefault == 0) { 2449 ispassive = 0; 2450 su = &data_dest; 2451 printaddr: 2452 #define UC(b) (((int) b) & 0xff) 2453 if (epsvall) { 2454 printf(" EPSV only mode (EPSV ALL)\r\n"); 2455 goto epsvonly; 2456 } 2457 2458 /* PORT/PASV */ 2459 if (su->su_family == AF_INET) { 2460 a = (u_char *) &su->su_sin.sin_addr; 2461 p = (u_char *) &su->su_sin.sin_port; 2462 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2463 ispassive ? "PASV" : "PORT", 2464 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2465 UC(p[0]), UC(p[1])); 2466 } 2467 2468 /* LPRT/LPSV */ 2469 { 2470 int alen, af, i; 2471 2472 switch (su->su_family) { 2473 case AF_INET: 2474 a = (u_char *) &su->su_sin.sin_addr; 2475 p = (u_char *) &su->su_sin.sin_port; 2476 alen = sizeof(su->su_sin.sin_addr); 2477 af = 4; 2478 break; 2479 case AF_INET6: 2480 a = (u_char *) &su->su_sin6.sin6_addr; 2481 p = (u_char *) &su->su_sin6.sin6_port; 2482 alen = sizeof(su->su_sin6.sin6_addr); 2483 af = 6; 2484 break; 2485 default: 2486 af = 0; 2487 break; 2488 } 2489 if (af) { 2490 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2491 af, alen); 2492 for (i = 0; i < alen; i++) 2493 printf("%d,", UC(a[i])); 2494 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2495 } 2496 } 2497 2498 epsvonly:; 2499 /* EPRT/EPSV */ 2500 { 2501 int af; 2502 2503 switch (su->su_family) { 2504 case AF_INET: 2505 af = 1; 2506 break; 2507 case AF_INET6: 2508 af = 2; 2509 break; 2510 default: 2511 af = 0; 2512 break; 2513 } 2514 if (af) { 2515 union sockunion tmp; 2516 2517 tmp = *su; 2518 if (tmp.su_family == AF_INET6) 2519 tmp.su_sin6.sin6_scope_id = 0; 2520 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2521 hname, sizeof(hname) - 1, NULL, 0, 2522 NI_NUMERICHOST)) { 2523 hname[sizeof(hname) - 1] = 0; 2524 printf(" %s |%d|%s|%d|\r\n", 2525 ispassive ? "EPSV" : "EPRT", 2526 af, hname, htons(tmp.su_port)); 2527 } 2528 } 2529 } 2530 #undef UC 2531 } else 2532 printf(" No data connection\r\n"); 2533 reply(211, "End of status."); 2534 } 2535 2536 void 2537 fatalerror(char *s) 2538 { 2539 2540 reply(451, "Error in server: %s", s); 2541 reply(221, "Closing connection due to server error."); 2542 dologout(0); 2543 /* NOTREACHED */ 2544 } 2545 2546 void 2547 reply(int n, const char *fmt, ...) 2548 { 2549 va_list ap; 2550 2551 (void)printf("%d ", n); 2552 va_start(ap, fmt); 2553 (void)vprintf(fmt, ap); 2554 va_end(ap); 2555 (void)printf("\r\n"); 2556 (void)fflush(stdout); 2557 if (ftpdebug) { 2558 syslog(LOG_DEBUG, "<--- %d ", n); 2559 va_start(ap, fmt); 2560 vsyslog(LOG_DEBUG, fmt, ap); 2561 va_end(ap); 2562 } 2563 } 2564 2565 void 2566 lreply(int n, const char *fmt, ...) 2567 { 2568 va_list ap; 2569 2570 (void)printf("%d- ", n); 2571 va_start(ap, fmt); 2572 (void)vprintf(fmt, ap); 2573 va_end(ap); 2574 (void)printf("\r\n"); 2575 (void)fflush(stdout); 2576 if (ftpdebug) { 2577 syslog(LOG_DEBUG, "<--- %d- ", n); 2578 va_start(ap, fmt); 2579 vsyslog(LOG_DEBUG, fmt, ap); 2580 va_end(ap); 2581 } 2582 } 2583 2584 static void 2585 ack(char *s) 2586 { 2587 2588 reply(250, "%s command successful.", s); 2589 } 2590 2591 void 2592 nack(char *s) 2593 { 2594 2595 reply(502, "%s command not implemented.", s); 2596 } 2597 2598 /* ARGSUSED */ 2599 void 2600 yyerror(char *s) 2601 { 2602 char *cp; 2603 2604 if ((cp = strchr(cbuf,'\n'))) 2605 *cp = '\0'; 2606 reply(500, "%s: command not understood.", cbuf); 2607 } 2608 2609 void 2610 delete(char *name) 2611 { 2612 struct stat st; 2613 2614 LOGCMD("delete", name); 2615 if (lstat(name, &st) < 0) { 2616 perror_reply(550, name); 2617 return; 2618 } 2619 if (S_ISDIR(st.st_mode)) { 2620 if (rmdir(name) < 0) { 2621 perror_reply(550, name); 2622 return; 2623 } 2624 goto done; 2625 } 2626 if (guest && noguestmod) { 2627 reply(550, "Operation not permitted."); 2628 return; 2629 } 2630 if (unlink(name) < 0) { 2631 perror_reply(550, name); 2632 return; 2633 } 2634 done: 2635 ack("DELE"); 2636 } 2637 2638 void 2639 cwd(char *path) 2640 { 2641 2642 if (chdir(path) < 0) 2643 perror_reply(550, path); 2644 else 2645 ack("CWD"); 2646 } 2647 2648 void 2649 makedir(char *name) 2650 { 2651 char *s; 2652 2653 LOGCMD("mkdir", name); 2654 if (guest && noguestmkd) 2655 reply(550, "Operation not permitted."); 2656 else if (mkdir(name, 0777) < 0) 2657 perror_reply(550, name); 2658 else { 2659 if ((s = doublequote(name)) == NULL) 2660 fatalerror("Ran out of memory."); 2661 reply(257, "\"%s\" directory created.", s); 2662 free(s); 2663 } 2664 } 2665 2666 void 2667 removedir(char *name) 2668 { 2669 2670 LOGCMD("rmdir", name); 2671 if (rmdir(name) < 0) 2672 perror_reply(550, name); 2673 else 2674 ack("RMD"); 2675 } 2676 2677 void 2678 pwd(void) 2679 { 2680 char *s, path[MAXPATHLEN + 1]; 2681 2682 if (getcwd(path, sizeof(path)) == NULL) 2683 perror_reply(550, "Get current directory"); 2684 else { 2685 if ((s = doublequote(path)) == NULL) 2686 fatalerror("Ran out of memory."); 2687 reply(257, "\"%s\" is current directory.", s); 2688 free(s); 2689 } 2690 } 2691 2692 char * 2693 renamefrom(char *name) 2694 { 2695 struct stat st; 2696 2697 if (guest && noguestmod) { 2698 reply(550, "Operation not permitted."); 2699 return (NULL); 2700 } 2701 if (lstat(name, &st) < 0) { 2702 perror_reply(550, name); 2703 return (NULL); 2704 } 2705 reply(350, "File exists, ready for destination name."); 2706 return (name); 2707 } 2708 2709 void 2710 renamecmd(char *from, char *to) 2711 { 2712 struct stat st; 2713 2714 LOGCMD2("rename", from, to); 2715 2716 if (guest && (stat(to, &st) == 0)) { 2717 reply(550, "%s: permission denied.", to); 2718 return; 2719 } 2720 2721 if (rename(from, to) < 0) 2722 perror_reply(550, "rename"); 2723 else 2724 ack("RNTO"); 2725 } 2726 2727 static void 2728 dolog(struct sockaddr *who) 2729 { 2730 char who_name[NI_MAXHOST]; 2731 2732 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2733 remotehost[sizeof(remotehost) - 1] = 0; 2734 if (getnameinfo(who, who->sa_len, 2735 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2736 *who_name = 0; 2737 who_name[sizeof(who_name) - 1] = 0; 2738 2739 #ifdef SETPROCTITLE 2740 #ifdef VIRTUAL_HOSTING 2741 if (thishost != firsthost) 2742 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2743 remotehost, hostname); 2744 else 2745 #endif 2746 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2747 remotehost); 2748 setproctitle("%s", proctitle); 2749 #endif /* SETPROCTITLE */ 2750 2751 if (logging) { 2752 #ifdef VIRTUAL_HOSTING 2753 if (thishost != firsthost) 2754 syslog(LOG_INFO, "connection from %s (%s) to %s", 2755 remotehost, who_name, hostname); 2756 else 2757 #endif 2758 syslog(LOG_INFO, "connection from %s (%s)", 2759 remotehost, who_name); 2760 } 2761 } 2762 2763 /* 2764 * Record logout in wtmp file 2765 * and exit with supplied status. 2766 */ 2767 void 2768 dologout(int status) 2769 { 2770 2771 if (logged_in && dowtmp) { 2772 (void) seteuid(0); 2773 ftpd_logwtmp(wtmpid, NULL, NULL); 2774 } 2775 /* beware of flushing buffers after a SIGPIPE */ 2776 _exit(status); 2777 } 2778 2779 static void 2780 sigurg(int signo) 2781 { 2782 2783 recvurg = 1; 2784 } 2785 2786 static void 2787 maskurg(int flag) 2788 { 2789 int oerrno; 2790 sigset_t sset; 2791 2792 if (!transflag) { 2793 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2794 return; 2795 } 2796 oerrno = errno; 2797 sigemptyset(&sset); 2798 sigaddset(&sset, SIGURG); 2799 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2800 errno = oerrno; 2801 } 2802 2803 static void 2804 flagxfer(int flag) 2805 { 2806 2807 if (flag) { 2808 if (transflag) 2809 syslog(LOG_ERR, "Internal: flagxfer(1): " 2810 "transfer already under way"); 2811 transflag = 1; 2812 maskurg(0); 2813 recvurg = 0; 2814 } else { 2815 if (!transflag) 2816 syslog(LOG_ERR, "Internal: flagxfer(0): " 2817 "no active transfer"); 2818 maskurg(1); 2819 transflag = 0; 2820 } 2821 } 2822 2823 /* 2824 * Returns 0 if OK to resume or -1 if abort requested. 2825 */ 2826 static int 2827 myoob(void) 2828 { 2829 char *cp; 2830 int ret; 2831 2832 if (!transflag) { 2833 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2834 return (0); 2835 } 2836 cp = tmpline; 2837 ret = get_line(cp, 7, stdin); 2838 if (ret == -1) { 2839 reply(221, "You could at least say goodbye."); 2840 dologout(0); 2841 } else if (ret == -2) { 2842 /* Ignore truncated command. */ 2843 return (0); 2844 } 2845 upper(cp); 2846 if (strcmp(cp, "ABOR\r\n") == 0) { 2847 tmpline[0] = '\0'; 2848 reply(426, "Transfer aborted. Data connection closed."); 2849 reply(226, "Abort successful."); 2850 return (-1); 2851 } 2852 if (strcmp(cp, "STAT\r\n") == 0) { 2853 tmpline[0] = '\0'; 2854 if (file_size != -1) 2855 reply(213, "Status: %jd of %jd bytes transferred.", 2856 (intmax_t)byte_count, (intmax_t)file_size); 2857 else 2858 reply(213, "Status: %jd bytes transferred.", 2859 (intmax_t)byte_count); 2860 } 2861 return (0); 2862 } 2863 2864 /* 2865 * Note: a response of 425 is not mentioned as a possible response to 2866 * the PASV command in RFC959. However, it has been blessed as 2867 * a legitimate response by Jon Postel in a telephone conversation 2868 * with Rick Adams on 25 Jan 89. 2869 */ 2870 void 2871 passive(void) 2872 { 2873 socklen_t len; 2874 int on; 2875 char *p, *a; 2876 2877 if (pdata >= 0) /* close old port if one set */ 2878 close(pdata); 2879 2880 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2881 if (pdata < 0) { 2882 perror_reply(425, "Can't open passive connection"); 2883 return; 2884 } 2885 on = 1; 2886 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2887 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2888 2889 (void) seteuid(0); 2890 2891 #ifdef IP_PORTRANGE 2892 if (ctrl_addr.su_family == AF_INET) { 2893 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2894 : IP_PORTRANGE_DEFAULT; 2895 2896 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2897 &on, sizeof(on)) < 0) 2898 goto pasv_error; 2899 } 2900 #endif 2901 #ifdef IPV6_PORTRANGE 2902 if (ctrl_addr.su_family == AF_INET6) { 2903 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2904 : IPV6_PORTRANGE_DEFAULT; 2905 2906 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2907 &on, sizeof(on)) < 0) 2908 goto pasv_error; 2909 } 2910 #endif 2911 2912 pasv_addr = ctrl_addr; 2913 pasv_addr.su_port = 0; 2914 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2915 goto pasv_error; 2916 2917 (void) seteuid(pw->pw_uid); 2918 2919 len = sizeof(pasv_addr); 2920 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2921 goto pasv_error; 2922 if (listen(pdata, 1) < 0) 2923 goto pasv_error; 2924 if (pasv_addr.su_family == AF_INET) 2925 a = (char *) &pasv_addr.su_sin.sin_addr; 2926 else if (pasv_addr.su_family == AF_INET6 && 2927 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2928 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2929 else 2930 goto pasv_error; 2931 2932 p = (char *) &pasv_addr.su_port; 2933 2934 #define UC(b) (((int) b) & 0xff) 2935 2936 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2937 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2938 return; 2939 2940 pasv_error: 2941 (void) seteuid(pw->pw_uid); 2942 (void) close(pdata); 2943 pdata = -1; 2944 perror_reply(425, "Can't open passive connection"); 2945 return; 2946 } 2947 2948 /* 2949 * Long Passive defined in RFC 1639. 2950 * 228 Entering Long Passive Mode 2951 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2952 */ 2953 2954 void 2955 long_passive(char *cmd, int pf) 2956 { 2957 socklen_t len; 2958 int on; 2959 char *p, *a; 2960 2961 if (pdata >= 0) /* close old port if one set */ 2962 close(pdata); 2963 2964 if (pf != PF_UNSPEC) { 2965 if (ctrl_addr.su_family != pf) { 2966 switch (ctrl_addr.su_family) { 2967 case AF_INET: 2968 pf = 1; 2969 break; 2970 case AF_INET6: 2971 pf = 2; 2972 break; 2973 default: 2974 pf = 0; 2975 break; 2976 } 2977 /* 2978 * XXX 2979 * only EPRT/EPSV ready clients will understand this 2980 */ 2981 if (strcmp(cmd, "EPSV") == 0 && pf) { 2982 reply(522, "Network protocol mismatch, " 2983 "use (%d)", pf); 2984 } else 2985 reply(501, "Network protocol mismatch."); /*XXX*/ 2986 2987 return; 2988 } 2989 } 2990 2991 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2992 if (pdata < 0) { 2993 perror_reply(425, "Can't open passive connection"); 2994 return; 2995 } 2996 on = 1; 2997 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2998 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2999 3000 (void) seteuid(0); 3001 3002 pasv_addr = ctrl_addr; 3003 pasv_addr.su_port = 0; 3004 len = pasv_addr.su_len; 3005 3006 #ifdef IP_PORTRANGE 3007 if (ctrl_addr.su_family == AF_INET) { 3008 on = restricted_data_ports ? IP_PORTRANGE_HIGH 3009 : IP_PORTRANGE_DEFAULT; 3010 3011 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 3012 &on, sizeof(on)) < 0) 3013 goto pasv_error; 3014 } 3015 #endif 3016 #ifdef IPV6_PORTRANGE 3017 if (ctrl_addr.su_family == AF_INET6) { 3018 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 3019 : IPV6_PORTRANGE_DEFAULT; 3020 3021 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 3022 &on, sizeof(on)) < 0) 3023 goto pasv_error; 3024 } 3025 #endif 3026 3027 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 3028 goto pasv_error; 3029 3030 (void) seteuid(pw->pw_uid); 3031 3032 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 3033 goto pasv_error; 3034 if (listen(pdata, 1) < 0) 3035 goto pasv_error; 3036 3037 #define UC(b) (((int) b) & 0xff) 3038 3039 if (strcmp(cmd, "LPSV") == 0) { 3040 p = (char *)&pasv_addr.su_port; 3041 switch (pasv_addr.su_family) { 3042 case AF_INET: 3043 a = (char *) &pasv_addr.su_sin.sin_addr; 3044 v4_reply: 3045 reply(228, 3046 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3047 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3048 2, UC(p[0]), UC(p[1])); 3049 return; 3050 case AF_INET6: 3051 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3052 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3053 goto v4_reply; 3054 } 3055 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3056 reply(228, 3057 "Entering Long Passive Mode " 3058 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3059 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3060 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3061 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3062 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3063 2, UC(p[0]), UC(p[1])); 3064 return; 3065 } 3066 } else if (strcmp(cmd, "EPSV") == 0) { 3067 switch (pasv_addr.su_family) { 3068 case AF_INET: 3069 case AF_INET6: 3070 reply(229, "Entering Extended Passive Mode (|||%d|)", 3071 ntohs(pasv_addr.su_port)); 3072 return; 3073 } 3074 } else { 3075 /* more proper error code? */ 3076 } 3077 3078 pasv_error: 3079 (void) seteuid(pw->pw_uid); 3080 (void) close(pdata); 3081 pdata = -1; 3082 perror_reply(425, "Can't open passive connection"); 3083 return; 3084 } 3085 3086 /* 3087 * Generate unique name for file with basename "local" 3088 * and open the file in order to avoid possible races. 3089 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3090 * Return descriptor to the file, set "name" to its name. 3091 * 3092 * Generates failure reply on error. 3093 */ 3094 static int 3095 guniquefd(char *local, char **name) 3096 { 3097 static char new[MAXPATHLEN]; 3098 struct stat st; 3099 char *cp; 3100 int count; 3101 int fd; 3102 3103 cp = strrchr(local, '/'); 3104 if (cp) 3105 *cp = '\0'; 3106 if (stat(cp ? local : ".", &st) < 0) { 3107 perror_reply(553, cp ? local : "."); 3108 return (-1); 3109 } 3110 if (cp) { 3111 /* 3112 * Let not overwrite dirname with counter suffix. 3113 * -4 is for /nn\0 3114 * In this extreme case dot won't be put in front of suffix. 3115 */ 3116 if (strlen(local) > sizeof(new) - 4) { 3117 reply(553, "Pathname too long."); 3118 return (-1); 3119 } 3120 *cp = '/'; 3121 } 3122 /* -4 is for the .nn<null> we put on the end below */ 3123 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3124 cp = new + strlen(new); 3125 /* 3126 * Don't generate dotfile unless requested explicitly. 3127 * This covers the case when basename gets truncated off 3128 * by buffer size. 3129 */ 3130 if (cp > new && cp[-1] != '/') 3131 *cp++ = '.'; 3132 for (count = 0; count < 100; count++) { 3133 /* At count 0 try unmodified name */ 3134 if (count) 3135 (void)sprintf(cp, "%d", count); 3136 if ((fd = open(count ? new : local, 3137 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3138 *name = count ? new : local; 3139 return (fd); 3140 } 3141 if (errno != EEXIST) { 3142 perror_reply(553, count ? new : local); 3143 return (-1); 3144 } 3145 } 3146 reply(452, "Unique file name cannot be created."); 3147 return (-1); 3148 } 3149 3150 /* 3151 * Format and send reply containing system error number. 3152 */ 3153 void 3154 perror_reply(int code, char *string) 3155 { 3156 3157 reply(code, "%s: %s.", string, strerror(errno)); 3158 } 3159 3160 static char *onefile[] = { 3161 "", 3162 0 3163 }; 3164 3165 void 3166 send_file_list(char *whichf) 3167 { 3168 struct stat st; 3169 DIR *dirp = NULL; 3170 struct dirent *dir; 3171 FILE *dout = NULL; 3172 char **dirlist, *dirname; 3173 int simple = 0; 3174 int freeglob = 0; 3175 glob_t gl; 3176 3177 if (strpbrk(whichf, "~{[*?") != NULL) { 3178 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3179 3180 memset(&gl, 0, sizeof(gl)); 3181 gl.gl_matchc = MAXGLOBARGS; 3182 flags |= GLOB_LIMIT; 3183 freeglob = 1; 3184 if (glob(whichf, flags, 0, &gl)) { 3185 reply(550, "No matching files found."); 3186 goto out; 3187 } else if (gl.gl_pathc == 0) { 3188 errno = ENOENT; 3189 perror_reply(550, whichf); 3190 goto out; 3191 } 3192 dirlist = gl.gl_pathv; 3193 } else { 3194 onefile[0] = whichf; 3195 dirlist = onefile; 3196 simple = 1; 3197 } 3198 3199 while ((dirname = *dirlist++)) { 3200 if (stat(dirname, &st) < 0) { 3201 /* 3202 * If user typed "ls -l", etc, and the client 3203 * used NLST, do what the user meant. 3204 */ 3205 if (dirname[0] == '-' && *dirlist == NULL && 3206 dout == NULL) 3207 retrieve(_PATH_LS " %s", dirname); 3208 else 3209 perror_reply(550, whichf); 3210 goto out; 3211 } 3212 3213 if (S_ISREG(st.st_mode)) { 3214 if (dout == NULL) { 3215 dout = dataconn("file list", -1, "w"); 3216 if (dout == NULL) 3217 goto out; 3218 STARTXFER; 3219 } 3220 START_UNSAFE; 3221 fprintf(dout, "%s%s\n", dirname, 3222 type == TYPE_A ? "\r" : ""); 3223 END_UNSAFE; 3224 if (ferror(dout)) 3225 goto data_err; 3226 byte_count += strlen(dirname) + 3227 (type == TYPE_A ? 2 : 1); 3228 CHECKOOB(goto abrt); 3229 continue; 3230 } else if (!S_ISDIR(st.st_mode)) 3231 continue; 3232 3233 if ((dirp = opendir(dirname)) == NULL) 3234 continue; 3235 3236 while ((dir = readdir(dirp)) != NULL) { 3237 char nbuf[MAXPATHLEN]; 3238 3239 CHECKOOB(goto abrt); 3240 3241 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3242 continue; 3243 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3244 dir->d_namlen == 2) 3245 continue; 3246 3247 snprintf(nbuf, sizeof(nbuf), 3248 "%s/%s", dirname, dir->d_name); 3249 3250 /* 3251 * We have to do a stat to insure it's 3252 * not a directory or special file. 3253 */ 3254 if (simple || (stat(nbuf, &st) == 0 && 3255 S_ISREG(st.st_mode))) { 3256 if (dout == NULL) { 3257 dout = dataconn("file list", -1, "w"); 3258 if (dout == NULL) 3259 goto out; 3260 STARTXFER; 3261 } 3262 START_UNSAFE; 3263 if (nbuf[0] == '.' && nbuf[1] == '/') 3264 fprintf(dout, "%s%s\n", &nbuf[2], 3265 type == TYPE_A ? "\r" : ""); 3266 else 3267 fprintf(dout, "%s%s\n", nbuf, 3268 type == TYPE_A ? "\r" : ""); 3269 END_UNSAFE; 3270 if (ferror(dout)) 3271 goto data_err; 3272 byte_count += strlen(nbuf) + 3273 (type == TYPE_A ? 2 : 1); 3274 CHECKOOB(goto abrt); 3275 } 3276 } 3277 (void) closedir(dirp); 3278 dirp = NULL; 3279 } 3280 3281 if (dout == NULL) 3282 reply(550, "No files found."); 3283 else if (ferror(dout)) 3284 data_err: perror_reply(550, "Data connection"); 3285 else 3286 reply(226, "Transfer complete."); 3287 out: 3288 if (dout) { 3289 ENDXFER; 3290 abrt: 3291 (void) fclose(dout); 3292 data = -1; 3293 pdata = -1; 3294 } 3295 if (dirp) 3296 (void) closedir(dirp); 3297 if (freeglob) { 3298 freeglob = 0; 3299 globfree(&gl); 3300 } 3301 } 3302 3303 void 3304 reapchild(int signo) 3305 { 3306 while (waitpid(-1, NULL, WNOHANG) > 0); 3307 } 3308 3309 #ifdef OLD_SETPROCTITLE 3310 /* 3311 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3312 * Warning, since this is usually started from inetd.conf, it often doesn't 3313 * have much of an environment or arglist to overwrite. 3314 */ 3315 void 3316 setproctitle(const char *fmt, ...) 3317 { 3318 int i; 3319 va_list ap; 3320 char *p, *bp, ch; 3321 char buf[LINE_MAX]; 3322 3323 va_start(ap, fmt); 3324 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3325 3326 /* make ps print our process name */ 3327 p = Argv[0]; 3328 *p++ = '-'; 3329 3330 i = strlen(buf); 3331 if (i > LastArgv - p - 2) { 3332 i = LastArgv - p - 2; 3333 buf[i] = '\0'; 3334 } 3335 bp = buf; 3336 while (ch = *bp++) 3337 if (ch != '\n' && ch != '\r') 3338 *p++ = ch; 3339 while (p < LastArgv) 3340 *p++ = ' '; 3341 } 3342 #endif /* OLD_SETPROCTITLE */ 3343 3344 static void 3345 appendf(char **strp, char *fmt, ...) 3346 { 3347 va_list ap; 3348 char *ostr, *p; 3349 3350 va_start(ap, fmt); 3351 vasprintf(&p, fmt, ap); 3352 va_end(ap); 3353 if (p == NULL) 3354 fatalerror("Ran out of memory."); 3355 if (*strp == NULL) 3356 *strp = p; 3357 else { 3358 ostr = *strp; 3359 asprintf(strp, "%s%s", ostr, p); 3360 if (*strp == NULL) 3361 fatalerror("Ran out of memory."); 3362 free(ostr); 3363 } 3364 } 3365 3366 static void 3367 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3368 { 3369 char *msg = NULL; 3370 char wd[MAXPATHLEN + 1]; 3371 3372 if (logging <= 1) 3373 return; 3374 3375 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3376 strcpy(wd, strerror(errno)); 3377 3378 appendf(&msg, "%s", cmd); 3379 if (file1) 3380 appendf(&msg, " %s", file1); 3381 if (file2) 3382 appendf(&msg, " %s", file2); 3383 if (cnt >= 0) 3384 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3385 appendf(&msg, " (wd: %s", wd); 3386 if (guest || dochroot) 3387 appendf(&msg, "; chrooted"); 3388 appendf(&msg, ")"); 3389 syslog(LOG_INFO, "%s", msg); 3390 free(msg); 3391 } 3392 3393 static void 3394 logxfer(char *name, off_t size, time_t start) 3395 { 3396 char buf[MAXPATHLEN + 1024]; 3397 char path[MAXPATHLEN + 1]; 3398 time_t now; 3399 3400 if (statfd >= 0) { 3401 time(&now); 3402 if (realpath(name, path) == NULL) { 3403 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3404 return; 3405 } 3406 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3407 ctime(&now)+4, ident, remotehost, 3408 path, (intmax_t)size, 3409 (long)(now - start + (now == start))); 3410 write(statfd, buf, strlen(buf)); 3411 } 3412 } 3413 3414 static char * 3415 doublequote(char *s) 3416 { 3417 int n; 3418 char *p, *s2; 3419 3420 for (p = s, n = 0; *p; p++) 3421 if (*p == '"') 3422 n++; 3423 3424 if ((s2 = malloc(p - s + n + 1)) == NULL) 3425 return (NULL); 3426 3427 for (p = s2; *s; s++, p++) { 3428 if ((*p = *s) == '"') 3429 *(++p) = '"'; 3430 } 3431 *p = '\0'; 3432 3433 return (s2); 3434 } 3435 3436 /* setup server socket for specified address family */ 3437 /* if af is PF_UNSPEC more than one socket may be returned */ 3438 /* the returned list is dynamically allocated, so caller needs to free it */ 3439 static int * 3440 socksetup(int af, char *bindname, const char *bindport) 3441 { 3442 struct addrinfo hints, *res, *r; 3443 int error, maxs, *s, *socks; 3444 const int on = 1; 3445 3446 memset(&hints, 0, sizeof(hints)); 3447 hints.ai_flags = AI_PASSIVE; 3448 hints.ai_family = af; 3449 hints.ai_socktype = SOCK_STREAM; 3450 error = getaddrinfo(bindname, bindport, &hints, &res); 3451 if (error) { 3452 syslog(LOG_ERR, "%s", gai_strerror(error)); 3453 if (error == EAI_SYSTEM) 3454 syslog(LOG_ERR, "%s", strerror(errno)); 3455 return NULL; 3456 } 3457 3458 /* Count max number of sockets we may open */ 3459 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3460 ; 3461 socks = malloc((maxs + 1) * sizeof(int)); 3462 if (!socks) { 3463 freeaddrinfo(res); 3464 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3465 return NULL; 3466 } 3467 3468 *socks = 0; /* num of sockets counter at start of array */ 3469 s = socks + 1; 3470 for (r = res; r; r = r->ai_next) { 3471 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3472 if (*s < 0) { 3473 syslog(LOG_DEBUG, "control socket: %m"); 3474 continue; 3475 } 3476 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3477 &on, sizeof(on)) < 0) 3478 syslog(LOG_WARNING, 3479 "control setsockopt (SO_REUSEADDR): %m"); 3480 if (r->ai_family == AF_INET6) { 3481 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3482 &on, sizeof(on)) < 0) 3483 syslog(LOG_WARNING, 3484 "control setsockopt (IPV6_V6ONLY): %m"); 3485 } 3486 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3487 syslog(LOG_DEBUG, "control bind: %m"); 3488 close(*s); 3489 continue; 3490 } 3491 (*socks)++; 3492 s++; 3493 } 3494 3495 if (res) 3496 freeaddrinfo(res); 3497 3498 if (*socks == 0) { 3499 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3500 free(socks); 3501 return NULL; 3502 } 3503 return(socks); 3504 } 3505