1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static char copyright[] = 35 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 #endif 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 /* 50 * FTP server. 51 */ 52 #include <sys/param.h> 53 #include <sys/ioctl.h> 54 #include <sys/mman.h> 55 #include <sys/socket.h> 56 #include <sys/stat.h> 57 #include <sys/time.h> 58 #include <sys/wait.h> 59 60 #include <netinet/in.h> 61 #include <netinet/in_systm.h> 62 #include <netinet/ip.h> 63 #include <netinet/tcp.h> 64 65 #define FTP_NAMES 66 #include <arpa/ftp.h> 67 #include <arpa/inet.h> 68 #include <arpa/telnet.h> 69 70 #include <ctype.h> 71 #include <dirent.h> 72 #include <err.h> 73 #include <errno.h> 74 #include <fcntl.h> 75 #include <glob.h> 76 #include <limits.h> 77 #include <netdb.h> 78 #include <pwd.h> 79 #include <grp.h> 80 #include <opie.h> 81 #include <signal.h> 82 #include <stdint.h> 83 #include <stdio.h> 84 #include <stdlib.h> 85 #include <string.h> 86 #include <syslog.h> 87 #include <time.h> 88 #include <unistd.h> 89 #include <libutil.h> 90 #ifdef LOGIN_CAP 91 #include <login_cap.h> 92 #endif 93 94 #ifdef USE_PAM 95 #include <security/pam_appl.h> 96 #endif 97 98 #include "blacklist_client.h" 99 #include "pathnames.h" 100 #include "extern.h" 101 102 #include <stdarg.h> 103 104 static char version[] = "Version 6.00LS"; 105 #undef main 106 107 union sockunion ctrl_addr; 108 union sockunion data_source; 109 union sockunion data_dest; 110 union sockunion his_addr; 111 union sockunion pasv_addr; 112 113 int daemon_mode; 114 int data; 115 int dataport; 116 int hostinfo = 1; /* print host-specific info in messages */ 117 int logged_in; 118 struct passwd *pw; 119 char *homedir; 120 int ftpdebug; 121 int timeout = 900; /* timeout after 15 minutes of inactivity */ 122 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 123 int logging; 124 int restricted_data_ports = 1; 125 int paranoid = 1; /* be extra careful about security */ 126 int anon_only = 0; /* Only anonymous ftp allowed */ 127 int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 128 int guest; 129 int dochroot; 130 char *chrootdir; 131 int dowtmp = 1; 132 int stats; 133 int statfd = -1; 134 int type; 135 int form; 136 int stru; /* avoid C keyword */ 137 int mode; 138 int usedefault = 1; /* for data transfers */ 139 int pdata = -1; /* for passive mode */ 140 int readonly = 0; /* Server is in readonly mode. */ 141 int noepsv = 0; /* EPSV command is disabled. */ 142 int noretr = 0; /* RETR command is disabled. */ 143 int noguestretr = 0; /* RETR command is disabled for anon users. */ 144 int noguestmkd = 0; /* MKD command is disabled for anon users. */ 145 int noguestmod = 1; /* anon users may not modify existing files. */ 146 int use_blacklist = 0; 147 148 off_t file_size; 149 off_t byte_count; 150 #if !defined(CMASK) || CMASK == 0 151 #undef CMASK 152 #define CMASK 027 153 #endif 154 int defumask = CMASK; /* default umask value */ 155 char tmpline[7]; 156 char *hostname; 157 int epsvall = 0; 158 159 #ifdef VIRTUAL_HOSTING 160 char *ftpuser; 161 162 static struct ftphost { 163 struct ftphost *next; 164 struct addrinfo *hostinfo; 165 char *hostname; 166 char *anonuser; 167 char *statfile; 168 char *welcome; 169 char *loginmsg; 170 } *thishost, *firsthost; 171 172 #endif 173 char remotehost[NI_MAXHOST]; 174 char *ident = NULL; 175 176 static char wtmpid[20]; 177 178 #ifdef USE_PAM 179 static int auth_pam(struct passwd**, const char*); 180 pam_handle_t *pamh = NULL; 181 #endif 182 183 static struct opie opiedata; 184 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 185 static int pwok; 186 187 char *pid_file = NULL; /* means default location to pidfile(3) */ 188 189 /* 190 * Limit number of pathnames that glob can return. 191 * A limit of 0 indicates the number of pathnames is unlimited. 192 */ 193 #define MAXGLOBARGS 16384 194 # 195 196 /* 197 * Timeout intervals for retrying connections 198 * to hosts that don't accept PORT cmds. This 199 * is a kludge, but given the problems with TCP... 200 */ 201 #define SWAITMAX 90 /* wait at most 90 seconds */ 202 #define SWAITINT 5 /* interval between retries */ 203 204 int swaitmax = SWAITMAX; 205 int swaitint = SWAITINT; 206 207 #ifdef SETPROCTITLE 208 #ifdef OLD_SETPROCTITLE 209 char **Argv = NULL; /* pointer to argument vector */ 210 char *LastArgv = NULL; /* end of argv */ 211 #endif /* OLD_SETPROCTITLE */ 212 char proctitle[LINE_MAX]; /* initial part of title */ 213 #endif /* SETPROCTITLE */ 214 215 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 216 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 217 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 218 219 static volatile sig_atomic_t recvurg; 220 static int transflag; /* NB: for debugging only */ 221 222 #define STARTXFER flagxfer(1) 223 #define ENDXFER flagxfer(0) 224 225 #define START_UNSAFE maskurg(1) 226 #define END_UNSAFE maskurg(0) 227 228 /* It's OK to put an `else' clause after this macro. */ 229 #define CHECKOOB(action) \ 230 if (recvurg) { \ 231 recvurg = 0; \ 232 if (myoob()) { \ 233 ENDXFER; \ 234 action; \ 235 } \ 236 } 237 238 #ifdef VIRTUAL_HOSTING 239 static void inithosts(int); 240 static void selecthost(union sockunion *); 241 #endif 242 static void ack(char *); 243 static void sigurg(int); 244 static void maskurg(int); 245 static void flagxfer(int); 246 static int myoob(void); 247 static int checkuser(char *, char *, int, char **, int *); 248 static FILE *dataconn(char *, off_t, char *); 249 static void dolog(struct sockaddr *); 250 static void end_login(void); 251 static FILE *getdatasock(char *); 252 static int guniquefd(char *, char **); 253 static void lostconn(int); 254 static void sigquit(int); 255 static int receive_data(FILE *, FILE *); 256 static int send_data(FILE *, FILE *, size_t, off_t, int); 257 static struct passwd * 258 sgetpwnam(char *); 259 static char *sgetsave(char *); 260 static void reapchild(int); 261 static void appendf(char **, char *, ...) __printflike(2, 3); 262 static void logcmd(char *, char *, char *, off_t); 263 static void logxfer(char *, off_t, time_t); 264 static char *doublequote(char *); 265 static int *socksetup(int, char *, const char *); 266 267 int 268 main(int argc, char *argv[], char **envp) 269 { 270 socklen_t addrlen; 271 int ch, on = 1, tos, s = STDIN_FILENO; 272 char *cp, line[LINE_MAX]; 273 FILE *fd; 274 char *bindname = NULL; 275 const char *bindport = "ftp"; 276 int family = AF_UNSPEC; 277 struct sigaction sa; 278 279 tzset(); /* in case no timezone database in ~ftp */ 280 sigemptyset(&sa.sa_mask); 281 sa.sa_flags = SA_RESTART; 282 283 #ifdef OLD_SETPROCTITLE 284 /* 285 * Save start and extent of argv for setproctitle. 286 */ 287 Argv = argv; 288 while (*envp) 289 envp++; 290 LastArgv = envp[-1] + strlen(envp[-1]); 291 #endif /* OLD_SETPROCTITLE */ 292 293 /* 294 * Prevent diagnostic messages from appearing on stderr. 295 * We run as a daemon or from inetd; in both cases, there's 296 * more reason in logging to syslog. 297 */ 298 (void) freopen(_PATH_DEVNULL, "w", stderr); 299 opterr = 0; 300 301 /* 302 * LOG_NDELAY sets up the logging connection immediately, 303 * necessary for anonymous ftp's that chroot and can't do it later. 304 */ 305 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 306 307 while ((ch = getopt(argc, argv, 308 "468a:ABdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 309 switch (ch) { 310 case '4': 311 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 312 break; 313 314 case '6': 315 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 316 break; 317 318 case '8': 319 assumeutf8 = 1; 320 break; 321 322 case 'a': 323 bindname = optarg; 324 break; 325 326 case 'A': 327 anon_only = 1; 328 break; 329 330 case 'B': 331 #ifdef USE_BLACKLIST 332 use_blacklist = 1; 333 #else 334 syslog(LOG_WARNING, "not compiled with USE_BLACKLIST support"); 335 #endif 336 break; 337 338 case 'd': 339 ftpdebug++; 340 break; 341 342 case 'D': 343 daemon_mode++; 344 break; 345 346 case 'E': 347 noepsv = 1; 348 break; 349 350 case 'h': 351 hostinfo = 0; 352 break; 353 354 case 'l': 355 logging++; /* > 1 == extra logging */ 356 break; 357 358 case 'm': 359 noguestmod = 0; 360 break; 361 362 case 'M': 363 noguestmkd = 1; 364 break; 365 366 case 'o': 367 noretr = 1; 368 break; 369 370 case 'O': 371 noguestretr = 1; 372 break; 373 374 case 'p': 375 pid_file = optarg; 376 break; 377 378 case 'P': 379 bindport = optarg; 380 break; 381 382 case 'r': 383 readonly = 1; 384 break; 385 386 case 'R': 387 paranoid = 0; 388 break; 389 390 case 'S': 391 stats++; 392 break; 393 394 case 't': 395 timeout = atoi(optarg); 396 if (maxtimeout < timeout) 397 maxtimeout = timeout; 398 break; 399 400 case 'T': 401 maxtimeout = atoi(optarg); 402 if (timeout > maxtimeout) 403 timeout = maxtimeout; 404 break; 405 406 case 'u': 407 { 408 long val = 0; 409 410 val = strtol(optarg, &optarg, 8); 411 if (*optarg != '\0' || val < 0) 412 syslog(LOG_WARNING, "bad value for -u"); 413 else 414 defumask = val; 415 break; 416 } 417 case 'U': 418 restricted_data_ports = 0; 419 break; 420 421 case 'v': 422 ftpdebug++; 423 break; 424 425 case 'W': 426 dowtmp = 0; 427 break; 428 429 default: 430 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 431 break; 432 } 433 } 434 435 /* handle filesize limit gracefully */ 436 sa.sa_handler = SIG_IGN; 437 (void)sigaction(SIGXFSZ, &sa, NULL); 438 439 if (daemon_mode) { 440 int *ctl_sock, fd, maxfd = -1, nfds, i; 441 fd_set defreadfds, readfds; 442 pid_t pid; 443 struct pidfh *pfh; 444 445 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) { 446 if (errno == EEXIST) { 447 syslog(LOG_ERR, "%s already running, pid %d", 448 getprogname(), (int)pid); 449 exit(1); 450 } 451 syslog(LOG_WARNING, "pidfile_open: %m"); 452 } 453 454 /* 455 * Detach from parent. 456 */ 457 if (daemon(1, 1) < 0) { 458 syslog(LOG_ERR, "failed to become a daemon"); 459 exit(1); 460 } 461 462 if (pfh != NULL && pidfile_write(pfh) == -1) 463 syslog(LOG_WARNING, "pidfile_write: %m"); 464 465 sa.sa_handler = reapchild; 466 (void)sigaction(SIGCHLD, &sa, NULL); 467 468 #ifdef VIRTUAL_HOSTING 469 inithosts(family); 470 #endif 471 472 /* 473 * Open a socket, bind it to the FTP port, and start 474 * listening. 475 */ 476 ctl_sock = socksetup(family, bindname, bindport); 477 if (ctl_sock == NULL) 478 exit(1); 479 480 FD_ZERO(&defreadfds); 481 for (i = 1; i <= *ctl_sock; i++) { 482 FD_SET(ctl_sock[i], &defreadfds); 483 if (listen(ctl_sock[i], 32) < 0) { 484 syslog(LOG_ERR, "control listen: %m"); 485 exit(1); 486 } 487 if (maxfd < ctl_sock[i]) 488 maxfd = ctl_sock[i]; 489 } 490 491 /* 492 * Loop forever accepting connection requests and forking off 493 * children to handle them. 494 */ 495 while (1) { 496 FD_COPY(&defreadfds, &readfds); 497 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 498 if (nfds <= 0) { 499 if (nfds < 0 && errno != EINTR) 500 syslog(LOG_WARNING, "select: %m"); 501 continue; 502 } 503 504 pid = -1; 505 for (i = 1; i <= *ctl_sock; i++) 506 if (FD_ISSET(ctl_sock[i], &readfds)) { 507 addrlen = sizeof(his_addr); 508 fd = accept(ctl_sock[i], 509 (struct sockaddr *)&his_addr, 510 &addrlen); 511 if (fd == -1) { 512 syslog(LOG_WARNING, 513 "accept: %m"); 514 continue; 515 } 516 switch (pid = fork()) { 517 case 0: 518 /* child */ 519 (void) dup2(fd, s); 520 (void) dup2(fd, STDOUT_FILENO); 521 (void) close(fd); 522 for (i = 1; i <= *ctl_sock; i++) 523 close(ctl_sock[i]); 524 if (pfh != NULL) 525 pidfile_close(pfh); 526 goto gotchild; 527 case -1: 528 syslog(LOG_WARNING, "fork: %m"); 529 /* FALLTHROUGH */ 530 default: 531 close(fd); 532 } 533 } 534 } 535 } else { 536 addrlen = sizeof(his_addr); 537 if (getpeername(s, (struct sockaddr *)&his_addr, &addrlen) < 0) { 538 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 539 exit(1); 540 } 541 542 #ifdef VIRTUAL_HOSTING 543 if (his_addr.su_family == AF_INET6 && 544 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 545 family = AF_INET; 546 else 547 family = his_addr.su_family; 548 inithosts(family); 549 #endif 550 } 551 552 gotchild: 553 sa.sa_handler = SIG_DFL; 554 (void)sigaction(SIGCHLD, &sa, NULL); 555 556 sa.sa_handler = sigurg; 557 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 558 (void)sigaction(SIGURG, &sa, NULL); 559 560 sigfillset(&sa.sa_mask); /* block all signals in handler */ 561 sa.sa_flags = SA_RESTART; 562 sa.sa_handler = sigquit; 563 (void)sigaction(SIGHUP, &sa, NULL); 564 (void)sigaction(SIGINT, &sa, NULL); 565 (void)sigaction(SIGQUIT, &sa, NULL); 566 (void)sigaction(SIGTERM, &sa, NULL); 567 568 sa.sa_handler = lostconn; 569 (void)sigaction(SIGPIPE, &sa, NULL); 570 571 addrlen = sizeof(ctrl_addr); 572 if (getsockname(s, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 573 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 574 exit(1); 575 } 576 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 577 #ifdef VIRTUAL_HOSTING 578 /* select our identity from virtual host table */ 579 selecthost(&ctrl_addr); 580 #endif 581 #ifdef IP_TOS 582 if (ctrl_addr.su_family == AF_INET) 583 { 584 tos = IPTOS_LOWDELAY; 585 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 586 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 587 } 588 #endif 589 /* 590 * Disable Nagle on the control channel so that we don't have to wait 591 * for peer's ACK before issuing our next reply. 592 */ 593 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 594 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 595 596 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 597 598 (void)snprintf(wtmpid, sizeof(wtmpid), "%xftpd", getpid()); 599 600 /* Try to handle urgent data inline */ 601 #ifdef SO_OOBINLINE 602 if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 603 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 604 #endif 605 606 #ifdef F_SETOWN 607 if (fcntl(s, F_SETOWN, getpid()) == -1) 608 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 609 #endif 610 dolog((struct sockaddr *)&his_addr); 611 /* 612 * Set up default state 613 */ 614 data = -1; 615 type = TYPE_A; 616 form = FORM_N; 617 stru = STRU_F; 618 mode = MODE_S; 619 tmpline[0] = '\0'; 620 621 /* If logins are disabled, print out the message. */ 622 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 623 while (fgets(line, sizeof(line), fd) != NULL) { 624 if ((cp = strchr(line, '\n')) != NULL) 625 *cp = '\0'; 626 lreply(530, "%s", line); 627 } 628 (void) fflush(stdout); 629 (void) fclose(fd); 630 reply(530, "System not available."); 631 exit(0); 632 } 633 #ifdef VIRTUAL_HOSTING 634 fd = fopen(thishost->welcome, "r"); 635 #else 636 fd = fopen(_PATH_FTPWELCOME, "r"); 637 #endif 638 if (fd != NULL) { 639 while (fgets(line, sizeof(line), fd) != NULL) { 640 if ((cp = strchr(line, '\n')) != NULL) 641 *cp = '\0'; 642 lreply(220, "%s", line); 643 } 644 (void) fflush(stdout); 645 (void) fclose(fd); 646 /* reply(220,) must follow */ 647 } 648 #ifndef VIRTUAL_HOSTING 649 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 650 fatalerror("Ran out of memory."); 651 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 652 hostname[0] = '\0'; 653 hostname[MAXHOSTNAMELEN - 1] = '\0'; 654 #endif 655 if (hostinfo) 656 reply(220, "%s FTP server (%s) ready.", hostname, version); 657 else 658 reply(220, "FTP server ready."); 659 BLACKLIST_INIT(); 660 for (;;) 661 (void) yyparse(); 662 /* NOTREACHED */ 663 } 664 665 static void 666 lostconn(int signo) 667 { 668 669 if (ftpdebug) 670 syslog(LOG_DEBUG, "lost connection"); 671 dologout(1); 672 } 673 674 static void 675 sigquit(int signo) 676 { 677 678 syslog(LOG_ERR, "got signal %d", signo); 679 dologout(1); 680 } 681 682 #ifdef VIRTUAL_HOSTING 683 /* 684 * read in virtual host tables (if they exist) 685 */ 686 687 static void 688 inithosts(int family) 689 { 690 int insert; 691 size_t len; 692 FILE *fp; 693 char *cp, *mp, *line; 694 char *hostname; 695 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 696 struct ftphost *hrp, *lhrp; 697 struct addrinfo hints, *res, *ai; 698 699 /* 700 * Fill in the default host information 701 */ 702 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 703 fatalerror("Ran out of memory."); 704 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 705 hostname[0] = '\0'; 706 hostname[MAXHOSTNAMELEN - 1] = '\0'; 707 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 708 fatalerror("Ran out of memory."); 709 hrp->hostname = hostname; 710 hrp->hostinfo = NULL; 711 712 memset(&hints, 0, sizeof(hints)); 713 hints.ai_flags = AI_PASSIVE; 714 hints.ai_family = family; 715 hints.ai_socktype = SOCK_STREAM; 716 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 717 hrp->hostinfo = res; 718 hrp->statfile = _PATH_FTPDSTATFILE; 719 hrp->welcome = _PATH_FTPWELCOME; 720 hrp->loginmsg = _PATH_FTPLOGINMESG; 721 hrp->anonuser = "ftp"; 722 hrp->next = NULL; 723 thishost = firsthost = lhrp = hrp; 724 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 725 int addrsize, gothost; 726 void *addr; 727 struct hostent *hp; 728 729 while ((line = fgetln(fp, &len)) != NULL) { 730 int i, hp_error; 731 732 /* skip comments */ 733 if (line[0] == '#') 734 continue; 735 if (line[len - 1] == '\n') { 736 line[len - 1] = '\0'; 737 mp = NULL; 738 } else { 739 if ((mp = malloc(len + 1)) == NULL) 740 fatalerror("Ran out of memory."); 741 memcpy(mp, line, len); 742 mp[len] = '\0'; 743 line = mp; 744 } 745 cp = strtok(line, " \t"); 746 /* skip empty lines */ 747 if (cp == NULL) 748 goto nextline; 749 vhost = cp; 750 751 /* set defaults */ 752 anonuser = "ftp"; 753 statfile = _PATH_FTPDSTATFILE; 754 welcome = _PATH_FTPWELCOME; 755 loginmsg = _PATH_FTPLOGINMESG; 756 757 /* 758 * Preparse the line so we can use its info 759 * for all the addresses associated with 760 * the virtual host name. 761 * Field 0, the virtual host name, is special: 762 * it's already parsed off and will be strdup'ed 763 * later, after we know its canonical form. 764 */ 765 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 766 if (*cp != '-' && (cp = strdup(cp))) 767 switch (i) { 768 case 1: /* anon user permissions */ 769 anonuser = cp; 770 break; 771 case 2: /* statistics file */ 772 statfile = cp; 773 break; 774 case 3: /* welcome message */ 775 welcome = cp; 776 break; 777 case 4: /* login message */ 778 loginmsg = cp; 779 break; 780 default: /* programming error */ 781 abort(); 782 /* NOTREACHED */ 783 } 784 785 hints.ai_flags = AI_PASSIVE; 786 hints.ai_family = family; 787 hints.ai_socktype = SOCK_STREAM; 788 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 789 goto nextline; 790 for (ai = res; ai != NULL && ai->ai_addr != NULL; 791 ai = ai->ai_next) { 792 793 gothost = 0; 794 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 795 struct addrinfo *hi; 796 797 for (hi = hrp->hostinfo; hi != NULL; 798 hi = hi->ai_next) 799 if (hi->ai_addrlen == ai->ai_addrlen && 800 memcmp(hi->ai_addr, 801 ai->ai_addr, 802 ai->ai_addr->sa_len) == 0) { 803 gothost++; 804 break; 805 } 806 if (gothost) 807 break; 808 } 809 if (hrp == NULL) { 810 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 811 goto nextline; 812 hrp->hostname = NULL; 813 insert = 1; 814 } else { 815 if (hrp->hostinfo && hrp->hostinfo != res) 816 freeaddrinfo(hrp->hostinfo); 817 insert = 0; /* host already in the chain */ 818 } 819 hrp->hostinfo = res; 820 821 /* 822 * determine hostname to use. 823 * force defined name if there is a valid alias 824 * otherwise fallback to primary hostname 825 */ 826 /* XXX: getaddrinfo() can't do alias check */ 827 switch(hrp->hostinfo->ai_family) { 828 case AF_INET: 829 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 830 addrsize = sizeof(struct in_addr); 831 break; 832 case AF_INET6: 833 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 834 addrsize = sizeof(struct in6_addr); 835 break; 836 default: 837 /* should not reach here */ 838 freeaddrinfo(hrp->hostinfo); 839 if (insert) 840 free(hrp); /*not in chain, can free*/ 841 else 842 hrp->hostinfo = NULL; /*mark as blank*/ 843 goto nextline; 844 /* NOTREACHED */ 845 } 846 if ((hp = getipnodebyaddr(addr, addrsize, 847 hrp->hostinfo->ai_family, 848 &hp_error)) != NULL) { 849 if (strcmp(vhost, hp->h_name) != 0) { 850 if (hp->h_aliases == NULL) 851 vhost = hp->h_name; 852 else { 853 i = 0; 854 while (hp->h_aliases[i] && 855 strcmp(vhost, hp->h_aliases[i]) != 0) 856 ++i; 857 if (hp->h_aliases[i] == NULL) 858 vhost = hp->h_name; 859 } 860 } 861 } 862 if (hrp->hostname && 863 strcmp(hrp->hostname, vhost) != 0) { 864 free(hrp->hostname); 865 hrp->hostname = NULL; 866 } 867 if (hrp->hostname == NULL && 868 (hrp->hostname = strdup(vhost)) == NULL) { 869 freeaddrinfo(hrp->hostinfo); 870 hrp->hostinfo = NULL; /* mark as blank */ 871 if (hp) 872 freehostent(hp); 873 goto nextline; 874 } 875 hrp->anonuser = anonuser; 876 hrp->statfile = statfile; 877 hrp->welcome = welcome; 878 hrp->loginmsg = loginmsg; 879 if (insert) { 880 hrp->next = NULL; 881 lhrp->next = hrp; 882 lhrp = hrp; 883 } 884 if (hp) 885 freehostent(hp); 886 } 887 nextline: 888 if (mp) 889 free(mp); 890 } 891 (void) fclose(fp); 892 } 893 } 894 895 static void 896 selecthost(union sockunion *su) 897 { 898 struct ftphost *hrp; 899 u_int16_t port; 900 #ifdef INET6 901 struct in6_addr *mapped_in6 = NULL; 902 #endif 903 struct addrinfo *hi; 904 905 #ifdef INET6 906 /* 907 * XXX IPv4 mapped IPv6 addr consideraton, 908 * specified in rfc2373. 909 */ 910 if (su->su_family == AF_INET6 && 911 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 912 mapped_in6 = &su->su_sin6.sin6_addr; 913 #endif 914 915 hrp = thishost = firsthost; /* default */ 916 port = su->su_port; 917 su->su_port = 0; 918 while (hrp != NULL) { 919 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 920 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 921 thishost = hrp; 922 goto found; 923 } 924 #ifdef INET6 925 /* XXX IPv4 mapped IPv6 addr consideraton */ 926 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 927 (memcmp(&mapped_in6->s6_addr[12], 928 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 929 sizeof(struct in_addr)) == 0)) { 930 thishost = hrp; 931 goto found; 932 } 933 #endif 934 } 935 hrp = hrp->next; 936 } 937 found: 938 su->su_port = port; 939 /* setup static variables as appropriate */ 940 hostname = thishost->hostname; 941 ftpuser = thishost->anonuser; 942 } 943 #endif 944 945 /* 946 * Helper function for sgetpwnam(). 947 */ 948 static char * 949 sgetsave(char *s) 950 { 951 char *new = malloc(strlen(s) + 1); 952 953 if (new == NULL) { 954 reply(421, "Ran out of memory."); 955 dologout(1); 956 /* NOTREACHED */ 957 } 958 (void) strcpy(new, s); 959 return (new); 960 } 961 962 /* 963 * Save the result of a getpwnam. Used for USER command, since 964 * the data returned must not be clobbered by any other command 965 * (e.g., globbing). 966 * NB: The data returned by sgetpwnam() will remain valid until 967 * the next call to this function. Its difference from getpwnam() 968 * is that sgetpwnam() is known to be called from ftpd code only. 969 */ 970 static struct passwd * 971 sgetpwnam(char *name) 972 { 973 static struct passwd save; 974 struct passwd *p; 975 976 if ((p = getpwnam(name)) == NULL) 977 return (p); 978 if (save.pw_name) { 979 free(save.pw_name); 980 free(save.pw_passwd); 981 free(save.pw_class); 982 free(save.pw_gecos); 983 free(save.pw_dir); 984 free(save.pw_shell); 985 } 986 save = *p; 987 save.pw_name = sgetsave(p->pw_name); 988 save.pw_passwd = sgetsave(p->pw_passwd); 989 save.pw_class = sgetsave(p->pw_class); 990 save.pw_gecos = sgetsave(p->pw_gecos); 991 save.pw_dir = sgetsave(p->pw_dir); 992 save.pw_shell = sgetsave(p->pw_shell); 993 return (&save); 994 } 995 996 static int login_attempts; /* number of failed login attempts */ 997 static int askpasswd; /* had user command, ask for passwd */ 998 static char curname[MAXLOGNAME]; /* current USER name */ 999 1000 /* 1001 * USER command. 1002 * Sets global passwd pointer pw if named account exists and is acceptable; 1003 * sets askpasswd if a PASS command is expected. If logged in previously, 1004 * need to reset state. If name is "ftp" or "anonymous", the name is not in 1005 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 1006 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 1007 * requesting login privileges. Disallow anyone who does not have a standard 1008 * shell as returned by getusershell(). Disallow anyone mentioned in the file 1009 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 1010 */ 1011 void 1012 user(char *name) 1013 { 1014 int ecode; 1015 char *cp, *shell; 1016 1017 if (logged_in) { 1018 if (guest) { 1019 reply(530, "Can't change user from guest login."); 1020 return; 1021 } else if (dochroot) { 1022 reply(530, "Can't change user from chroot user."); 1023 return; 1024 } 1025 end_login(); 1026 } 1027 1028 guest = 0; 1029 #ifdef VIRTUAL_HOSTING 1030 pw = sgetpwnam(thishost->anonuser); 1031 #else 1032 pw = sgetpwnam("ftp"); 1033 #endif 1034 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1035 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL, &ecode) || 1036 (ecode != 0 && ecode != ENOENT)) 1037 reply(530, "User %s access denied.", name); 1038 else if (checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL, &ecode) || 1039 (ecode != 0 && ecode != ENOENT)) 1040 reply(530, "User %s access denied.", name); 1041 else if (pw != NULL) { 1042 guest = 1; 1043 askpasswd = 1; 1044 reply(331, 1045 "Guest login ok, send your email address as password."); 1046 } else 1047 reply(530, "User %s unknown.", name); 1048 if (!askpasswd && logging) 1049 syslog(LOG_NOTICE, 1050 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1051 return; 1052 } 1053 if (anon_only != 0) { 1054 reply(530, "Sorry, only anonymous ftp allowed."); 1055 return; 1056 } 1057 1058 if ((pw = sgetpwnam(name))) { 1059 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1060 shell = _PATH_BSHELL; 1061 setusershell(); 1062 while ((cp = getusershell()) != NULL) 1063 if (strcmp(cp, shell) == 0) 1064 break; 1065 endusershell(); 1066 1067 if (cp == NULL || 1068 (checkuser(_PATH_FTPUSERS, name, 1, NULL, &ecode) || 1069 (ecode != 0 && ecode != ENOENT))) { 1070 reply(530, "User %s access denied.", name); 1071 if (logging) 1072 syslog(LOG_NOTICE, 1073 "FTP LOGIN REFUSED FROM %s, %s", 1074 remotehost, name); 1075 pw = NULL; 1076 return; 1077 } 1078 } 1079 if (logging) 1080 strlcpy(curname, name, sizeof(curname)); 1081 1082 pwok = 0; 1083 #ifdef USE_PAM 1084 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1085 #endif 1086 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1087 pwok = (pw != NULL) && 1088 opieaccessfile(remotehost) && 1089 opiealways(pw->pw_dir); 1090 reply(331, "Response to %s %s for %s.", 1091 opieprompt, pwok ? "requested" : "required", name); 1092 } else { 1093 pwok = 1; 1094 reply(331, "Password required for %s.", name); 1095 } 1096 askpasswd = 1; 1097 /* 1098 * Delay before reading passwd after first failed 1099 * attempt to slow down passwd-guessing programs. 1100 */ 1101 if (login_attempts) 1102 sleep(login_attempts); 1103 } 1104 1105 /* 1106 * Check if a user is in the file "fname", 1107 * return a pointer to a malloc'd string with the rest 1108 * of the matching line in "residue" if not NULL. 1109 */ 1110 static int 1111 checkuser(char *fname, char *name, int pwset, char **residue, int *ecode) 1112 { 1113 FILE *fd; 1114 int found = 0; 1115 size_t len; 1116 char *line, *mp, *p; 1117 1118 if (ecode != NULL) 1119 *ecode = 0; 1120 if ((fd = fopen(fname, "r")) != NULL) { 1121 while (!found && (line = fgetln(fd, &len)) != NULL) { 1122 /* skip comments */ 1123 if (line[0] == '#') 1124 continue; 1125 if (line[len - 1] == '\n') { 1126 line[len - 1] = '\0'; 1127 mp = NULL; 1128 } else { 1129 if ((mp = malloc(len + 1)) == NULL) 1130 fatalerror("Ran out of memory."); 1131 memcpy(mp, line, len); 1132 mp[len] = '\0'; 1133 line = mp; 1134 } 1135 /* avoid possible leading and trailing whitespace */ 1136 p = strtok(line, " \t"); 1137 /* skip empty lines */ 1138 if (p == NULL) 1139 goto nextline; 1140 /* 1141 * if first chr is '@', check group membership 1142 */ 1143 if (p[0] == '@') { 1144 int i = 0; 1145 struct group *grp; 1146 1147 if (p[1] == '\0') /* single @ matches anyone */ 1148 found = 1; 1149 else { 1150 if ((grp = getgrnam(p+1)) == NULL) 1151 goto nextline; 1152 /* 1153 * Check user's default group 1154 */ 1155 if (pwset && grp->gr_gid == pw->pw_gid) 1156 found = 1; 1157 /* 1158 * Check supplementary groups 1159 */ 1160 while (!found && grp->gr_mem[i]) 1161 found = strcmp(name, 1162 grp->gr_mem[i++]) 1163 == 0; 1164 } 1165 } 1166 /* 1167 * Otherwise, just check for username match 1168 */ 1169 else 1170 found = strcmp(p, name) == 0; 1171 /* 1172 * Save the rest of line to "residue" if matched 1173 */ 1174 if (found && residue) { 1175 if ((p = strtok(NULL, "")) != NULL) 1176 p += strspn(p, " \t"); 1177 if (p && *p) { 1178 if ((*residue = strdup(p)) == NULL) 1179 fatalerror("Ran out of memory."); 1180 } else 1181 *residue = NULL; 1182 } 1183 nextline: 1184 if (mp) 1185 free(mp); 1186 } 1187 (void) fclose(fd); 1188 } else if (ecode != NULL) 1189 *ecode = errno; 1190 return (found); 1191 } 1192 1193 /* 1194 * Terminate login as previous user, if any, resetting state; 1195 * used when USER command is given or login fails. 1196 */ 1197 static void 1198 end_login(void) 1199 { 1200 #ifdef USE_PAM 1201 int e; 1202 #endif 1203 1204 (void) seteuid(0); 1205 #ifdef LOGIN_CAP 1206 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 1207 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 1208 LOGIN_SETENV)); 1209 #endif 1210 if (logged_in && dowtmp) 1211 ftpd_logwtmp(wtmpid, NULL, NULL); 1212 pw = NULL; 1213 #ifdef USE_PAM 1214 if (pamh) { 1215 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1216 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1217 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1218 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1219 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1220 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1221 pamh = NULL; 1222 } 1223 #endif 1224 logged_in = 0; 1225 guest = 0; 1226 dochroot = 0; 1227 } 1228 1229 #ifdef USE_PAM 1230 1231 /* 1232 * the following code is stolen from imap-uw PAM authentication module and 1233 * login.c 1234 */ 1235 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1236 1237 struct cred_t { 1238 const char *uname; /* user name */ 1239 const char *pass; /* password */ 1240 }; 1241 typedef struct cred_t cred_t; 1242 1243 static int 1244 auth_conv(int num_msg, const struct pam_message **msg, 1245 struct pam_response **resp, void *appdata) 1246 { 1247 int i; 1248 cred_t *cred = (cred_t *) appdata; 1249 struct pam_response *reply; 1250 1251 reply = calloc(num_msg, sizeof *reply); 1252 if (reply == NULL) 1253 return PAM_BUF_ERR; 1254 1255 for (i = 0; i < num_msg; i++) { 1256 switch (msg[i]->msg_style) { 1257 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1258 reply[i].resp_retcode = PAM_SUCCESS; 1259 reply[i].resp = COPY_STRING(cred->uname); 1260 /* PAM frees resp. */ 1261 break; 1262 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1263 reply[i].resp_retcode = PAM_SUCCESS; 1264 reply[i].resp = COPY_STRING(cred->pass); 1265 /* PAM frees resp. */ 1266 break; 1267 case PAM_TEXT_INFO: 1268 case PAM_ERROR_MSG: 1269 reply[i].resp_retcode = PAM_SUCCESS; 1270 reply[i].resp = NULL; 1271 break; 1272 default: /* unknown message style */ 1273 free(reply); 1274 return PAM_CONV_ERR; 1275 } 1276 } 1277 1278 *resp = reply; 1279 return PAM_SUCCESS; 1280 } 1281 1282 /* 1283 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1284 * authenticated, or 1 if not authenticated. If some sort of PAM system 1285 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1286 * function returns -1. This can be used as an indication that we should 1287 * fall back to a different authentication mechanism. 1288 */ 1289 static int 1290 auth_pam(struct passwd **ppw, const char *pass) 1291 { 1292 const char *tmpl_user; 1293 const void *item; 1294 int rval; 1295 int e; 1296 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1297 struct pam_conv conv = { &auth_conv, &auth_cred }; 1298 1299 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1300 if (e != PAM_SUCCESS) { 1301 /* 1302 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1303 * if context creation has failed in the first place. 1304 */ 1305 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1306 return -1; 1307 } 1308 1309 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1310 if (e != PAM_SUCCESS) { 1311 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1312 pam_strerror(pamh, e)); 1313 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1314 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1315 } 1316 pamh = NULL; 1317 return -1; 1318 } 1319 1320 e = pam_authenticate(pamh, 0); 1321 switch (e) { 1322 case PAM_SUCCESS: 1323 /* 1324 * With PAM we support the concept of a "template" 1325 * user. The user enters a login name which is 1326 * authenticated by PAM, usually via a remote service 1327 * such as RADIUS or TACACS+. If authentication 1328 * succeeds, a different but related "template" name 1329 * is used for setting the credentials, shell, and 1330 * home directory. The name the user enters need only 1331 * exist on the remote authentication server, but the 1332 * template name must be present in the local password 1333 * database. 1334 * 1335 * This is supported by two various mechanisms in the 1336 * individual modules. However, from the application's 1337 * point of view, the template user is always passed 1338 * back as a changed value of the PAM_USER item. 1339 */ 1340 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1341 PAM_SUCCESS) { 1342 tmpl_user = (const char *) item; 1343 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1344 *ppw = getpwnam(tmpl_user); 1345 } else 1346 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1347 pam_strerror(pamh, e)); 1348 rval = 0; 1349 break; 1350 1351 case PAM_AUTH_ERR: 1352 case PAM_USER_UNKNOWN: 1353 case PAM_MAXTRIES: 1354 rval = 1; 1355 break; 1356 1357 default: 1358 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1359 rval = -1; 1360 break; 1361 } 1362 1363 if (rval == 0) { 1364 e = pam_acct_mgmt(pamh, 0); 1365 if (e != PAM_SUCCESS) { 1366 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1367 pam_strerror(pamh, e)); 1368 rval = 1; 1369 } 1370 } 1371 1372 if (rval != 0) { 1373 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1374 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1375 } 1376 pamh = NULL; 1377 } 1378 return rval; 1379 } 1380 1381 #endif /* USE_PAM */ 1382 1383 void 1384 pass(char *passwd) 1385 { 1386 int rval, ecode; 1387 FILE *fd; 1388 #ifdef LOGIN_CAP 1389 login_cap_t *lc = NULL; 1390 #endif 1391 #ifdef USE_PAM 1392 int e; 1393 #endif 1394 char *residue = NULL; 1395 char *xpasswd; 1396 1397 if (logged_in || askpasswd == 0) { 1398 reply(503, "Login with USER first."); 1399 return; 1400 } 1401 askpasswd = 0; 1402 if (!guest) { /* "ftp" is only account allowed no password */ 1403 if (pw == NULL) { 1404 rval = 1; /* failure below */ 1405 goto skip; 1406 } 1407 #ifdef USE_PAM 1408 rval = auth_pam(&pw, passwd); 1409 if (rval >= 0) { 1410 opieunlock(); 1411 goto skip; 1412 } 1413 #endif 1414 if (opieverify(&opiedata, passwd) == 0) 1415 xpasswd = pw->pw_passwd; 1416 else if (pwok) { 1417 xpasswd = crypt(passwd, pw->pw_passwd); 1418 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1419 xpasswd = ":"; 1420 } else { 1421 rval = 1; 1422 goto skip; 1423 } 1424 rval = strcmp(pw->pw_passwd, xpasswd); 1425 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1426 rval = 1; /* failure */ 1427 skip: 1428 /* 1429 * If rval == 1, the user failed the authentication check 1430 * above. If rval == 0, either PAM or local authentication 1431 * succeeded. 1432 */ 1433 if (rval) { 1434 reply(530, "Login incorrect."); 1435 BLACKLIST_NOTIFY(BLACKLIST_AUTH_FAIL, STDIN_FILENO, "Login incorrect"); 1436 if (logging) { 1437 syslog(LOG_NOTICE, 1438 "FTP LOGIN FAILED FROM %s", 1439 remotehost); 1440 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1441 "FTP LOGIN FAILED FROM %s, %s", 1442 remotehost, curname); 1443 } 1444 pw = NULL; 1445 if (login_attempts++ >= 5) { 1446 syslog(LOG_NOTICE, 1447 "repeated login failures from %s", 1448 remotehost); 1449 exit(0); 1450 } 1451 return; 1452 } else { 1453 BLACKLIST_NOTIFY(BLACKLIST_AUTH_OK, STDIN_FILENO, "Login successful"); 1454 } 1455 } 1456 login_attempts = 0; /* this time successful */ 1457 if (setegid(pw->pw_gid) < 0) { 1458 reply(550, "Can't set gid."); 1459 return; 1460 } 1461 /* May be overridden by login.conf */ 1462 (void) umask(defumask); 1463 #ifdef LOGIN_CAP 1464 if ((lc = login_getpwclass(pw)) != NULL) { 1465 char remote_ip[NI_MAXHOST]; 1466 1467 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1468 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1469 NI_NUMERICHOST)) 1470 *remote_ip = 0; 1471 remote_ip[sizeof(remote_ip) - 1] = 0; 1472 if (!auth_hostok(lc, remotehost, remote_ip)) { 1473 syslog(LOG_INFO|LOG_AUTH, 1474 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1475 pw->pw_name); 1476 reply(530, "Permission denied."); 1477 pw = NULL; 1478 return; 1479 } 1480 if (!auth_timeok(lc, time(NULL))) { 1481 reply(530, "Login not available right now."); 1482 pw = NULL; 1483 return; 1484 } 1485 } 1486 setusercontext(lc, pw, 0, LOGIN_SETALL & 1487 ~(LOGIN_SETRESOURCES | LOGIN_SETUSER | LOGIN_SETPATH | LOGIN_SETENV)); 1488 #else 1489 setlogin(pw->pw_name); 1490 (void) initgroups(pw->pw_name, pw->pw_gid); 1491 #endif 1492 1493 #ifdef USE_PAM 1494 if (pamh) { 1495 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1496 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1497 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1498 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1499 } 1500 } 1501 #endif 1502 1503 dochroot = 1504 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue, &ecode) 1505 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1506 || login_getcapbool(lc, "ftp-chroot", 0) 1507 #endif 1508 ; 1509 /* 1510 * It is possible that checkuser() failed to open the chroot file. 1511 * If this is the case, report that logins are un-available, since we 1512 * have no way of checking whether or not the user should be chrooted. 1513 * We ignore ENOENT since it is not required that this file be present. 1514 */ 1515 if (ecode != 0 && ecode != ENOENT) { 1516 reply(530, "Login not available right now."); 1517 return; 1518 } 1519 chrootdir = NULL; 1520 1521 /* Disable wtmp logging when chrooting. */ 1522 if (dochroot || guest) 1523 dowtmp = 0; 1524 if (dowtmp) 1525 ftpd_logwtmp(wtmpid, pw->pw_name, 1526 (struct sockaddr *)&his_addr); 1527 logged_in = 1; 1528 1529 #ifdef LOGIN_CAP 1530 setusercontext(lc, pw, 0, LOGIN_SETRESOURCES); 1531 #endif 1532 1533 if (guest && stats && statfd < 0) 1534 #ifdef VIRTUAL_HOSTING 1535 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1536 #else 1537 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1538 #endif 1539 if (statfd < 0) 1540 stats = 0; 1541 1542 /* 1543 * For a chrooted local user, 1544 * a) see whether ftpchroot(5) specifies a chroot directory, 1545 * b) extract the directory pathname from the line, 1546 * c) expand it to the absolute pathname if necessary. 1547 */ 1548 if (dochroot && residue && 1549 (chrootdir = strtok(residue, " \t")) != NULL) { 1550 if (chrootdir[0] != '/') 1551 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1552 else 1553 chrootdir = strdup(chrootdir); /* make it permanent */ 1554 if (chrootdir == NULL) 1555 fatalerror("Ran out of memory."); 1556 } 1557 if (guest || dochroot) { 1558 /* 1559 * If no chroot directory set yet, use the login directory. 1560 * Copy it so it can be modified while pw->pw_dir stays intact. 1561 */ 1562 if (chrootdir == NULL && 1563 (chrootdir = strdup(pw->pw_dir)) == NULL) 1564 fatalerror("Ran out of memory."); 1565 /* 1566 * Check for the "/chroot/./home" syntax, 1567 * separate the chroot and home directory pathnames. 1568 */ 1569 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1570 *(homedir++) = '\0'; /* wipe '/' */ 1571 homedir++; /* skip '.' */ 1572 } else { 1573 /* 1574 * We MUST do a chdir() after the chroot. Otherwise 1575 * the old current directory will be accessible as "." 1576 * outside the new root! 1577 */ 1578 homedir = "/"; 1579 } 1580 /* 1581 * Finally, do chroot() 1582 */ 1583 if (chroot(chrootdir) < 0) { 1584 reply(550, "Can't change root."); 1585 goto bad; 1586 } 1587 __FreeBSD_libc_enter_restricted_mode(); 1588 } else /* real user w/o chroot */ 1589 homedir = pw->pw_dir; 1590 /* 1591 * Set euid *before* doing chdir() so 1592 * a) the user won't be carried to a directory that he couldn't reach 1593 * on his own due to no permission to upper path components, 1594 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1595 * (uid 0 has no root power over NFS if not mapped explicitly.) 1596 */ 1597 if (seteuid(pw->pw_uid) < 0) { 1598 if (guest || dochroot) { 1599 fatalerror("Can't set uid."); 1600 } else { 1601 reply(550, "Can't set uid."); 1602 goto bad; 1603 } 1604 } 1605 /* 1606 * Do not allow the session to live if we're chroot()'ed and chdir() 1607 * fails. Otherwise the chroot jail can be escaped. 1608 */ 1609 if (chdir(homedir) < 0) { 1610 if (guest || dochroot) { 1611 fatalerror("Can't change to base directory."); 1612 } else { 1613 if (chdir("/") < 0) { 1614 reply(550, "Root is inaccessible."); 1615 goto bad; 1616 } 1617 lreply(230, "No directory! Logging in with home=/."); 1618 } 1619 } 1620 1621 /* 1622 * Display a login message, if it exists. 1623 * N.B. reply(230,) must follow the message. 1624 */ 1625 #ifdef VIRTUAL_HOSTING 1626 fd = fopen(thishost->loginmsg, "r"); 1627 #else 1628 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1629 #endif 1630 if (fd != NULL) { 1631 char *cp, line[LINE_MAX]; 1632 1633 while (fgets(line, sizeof(line), fd) != NULL) { 1634 if ((cp = strchr(line, '\n')) != NULL) 1635 *cp = '\0'; 1636 lreply(230, "%s", line); 1637 } 1638 (void) fflush(stdout); 1639 (void) fclose(fd); 1640 } 1641 if (guest) { 1642 if (ident != NULL) 1643 free(ident); 1644 ident = strdup(passwd); 1645 if (ident == NULL) 1646 fatalerror("Ran out of memory."); 1647 1648 reply(230, "Guest login ok, access restrictions apply."); 1649 #ifdef SETPROCTITLE 1650 #ifdef VIRTUAL_HOSTING 1651 if (thishost != firsthost) 1652 snprintf(proctitle, sizeof(proctitle), 1653 "%s: anonymous(%s)/%s", remotehost, hostname, 1654 passwd); 1655 else 1656 #endif 1657 snprintf(proctitle, sizeof(proctitle), 1658 "%s: anonymous/%s", remotehost, passwd); 1659 setproctitle("%s", proctitle); 1660 #endif /* SETPROCTITLE */ 1661 if (logging) 1662 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1663 remotehost, passwd); 1664 } else { 1665 if (dochroot) 1666 reply(230, "User %s logged in, " 1667 "access restrictions apply.", pw->pw_name); 1668 else 1669 reply(230, "User %s logged in.", pw->pw_name); 1670 1671 #ifdef SETPROCTITLE 1672 snprintf(proctitle, sizeof(proctitle), 1673 "%s: user/%s", remotehost, pw->pw_name); 1674 setproctitle("%s", proctitle); 1675 #endif /* SETPROCTITLE */ 1676 if (logging) 1677 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1678 remotehost, pw->pw_name); 1679 } 1680 if (logging && (guest || dochroot)) 1681 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1682 #ifdef LOGIN_CAP 1683 login_close(lc); 1684 #endif 1685 if (residue) 1686 free(residue); 1687 return; 1688 bad: 1689 /* Forget all about it... */ 1690 #ifdef LOGIN_CAP 1691 login_close(lc); 1692 #endif 1693 if (residue) 1694 free(residue); 1695 end_login(); 1696 } 1697 1698 void 1699 retrieve(char *cmd, char *name) 1700 { 1701 FILE *fin, *dout; 1702 struct stat st; 1703 int (*closefunc)(FILE *); 1704 time_t start; 1705 char line[BUFSIZ]; 1706 1707 if (cmd == 0) { 1708 fin = fopen(name, "r"), closefunc = fclose; 1709 st.st_size = 0; 1710 } else { 1711 (void) snprintf(line, sizeof(line), cmd, name); 1712 name = line; 1713 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1714 st.st_size = -1; 1715 st.st_blksize = BUFSIZ; 1716 } 1717 if (fin == NULL) { 1718 if (errno != 0) { 1719 perror_reply(550, name); 1720 if (cmd == 0) { 1721 LOGCMD("get", name); 1722 } 1723 } 1724 return; 1725 } 1726 byte_count = -1; 1727 if (cmd == 0) { 1728 if (fstat(fileno(fin), &st) < 0) { 1729 perror_reply(550, name); 1730 goto done; 1731 } 1732 if (!S_ISREG(st.st_mode)) { 1733 /* 1734 * Never sending a raw directory is a workaround 1735 * for buggy clients that will attempt to RETR 1736 * a directory before listing it, e.g., Mozilla. 1737 * Preventing a guest from getting irregular files 1738 * is a simple security measure. 1739 */ 1740 if (S_ISDIR(st.st_mode) || guest) { 1741 reply(550, "%s: not a plain file.", name); 1742 goto done; 1743 } 1744 st.st_size = -1; 1745 /* st.st_blksize is set for all descriptor types */ 1746 } 1747 } 1748 if (restart_point) { 1749 if (type == TYPE_A) { 1750 off_t i, n; 1751 int c; 1752 1753 n = restart_point; 1754 i = 0; 1755 while (i++ < n) { 1756 if ((c=getc(fin)) == EOF) { 1757 perror_reply(550, name); 1758 goto done; 1759 } 1760 if (c == '\n') 1761 i++; 1762 } 1763 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1764 perror_reply(550, name); 1765 goto done; 1766 } 1767 } 1768 dout = dataconn(name, st.st_size, "w"); 1769 if (dout == NULL) 1770 goto done; 1771 time(&start); 1772 send_data(fin, dout, st.st_blksize, st.st_size, 1773 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1774 if (cmd == 0 && guest && stats && byte_count > 0) 1775 logxfer(name, byte_count, start); 1776 (void) fclose(dout); 1777 data = -1; 1778 pdata = -1; 1779 done: 1780 if (cmd == 0) 1781 LOGBYTES("get", name, byte_count); 1782 (*closefunc)(fin); 1783 } 1784 1785 void 1786 store(char *name, char *mode, int unique) 1787 { 1788 int fd; 1789 FILE *fout, *din; 1790 int (*closefunc)(FILE *); 1791 1792 if (*mode == 'a') { /* APPE */ 1793 if (unique) { 1794 /* Programming error */ 1795 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1796 unique = 0; 1797 } 1798 if (guest && noguestmod) { 1799 reply(550, "Appending to existing file denied."); 1800 goto err; 1801 } 1802 restart_point = 0; /* not affected by preceding REST */ 1803 } 1804 if (unique) /* STOU overrides REST */ 1805 restart_point = 0; 1806 if (guest && noguestmod) { 1807 if (restart_point) { /* guest STOR w/REST */ 1808 reply(550, "Modifying existing file denied."); 1809 goto err; 1810 } else /* treat guest STOR as STOU */ 1811 unique = 1; 1812 } 1813 1814 if (restart_point) 1815 mode = "r+"; /* so ASCII manual seek can work */ 1816 if (unique) { 1817 if ((fd = guniquefd(name, &name)) < 0) 1818 goto err; 1819 fout = fdopen(fd, mode); 1820 } else 1821 fout = fopen(name, mode); 1822 closefunc = fclose; 1823 if (fout == NULL) { 1824 perror_reply(553, name); 1825 goto err; 1826 } 1827 byte_count = -1; 1828 if (restart_point) { 1829 if (type == TYPE_A) { 1830 off_t i, n; 1831 int c; 1832 1833 n = restart_point; 1834 i = 0; 1835 while (i++ < n) { 1836 if ((c=getc(fout)) == EOF) { 1837 perror_reply(550, name); 1838 goto done; 1839 } 1840 if (c == '\n') 1841 i++; 1842 } 1843 /* 1844 * We must do this seek to "current" position 1845 * because we are changing from reading to 1846 * writing. 1847 */ 1848 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1849 perror_reply(550, name); 1850 goto done; 1851 } 1852 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1853 perror_reply(550, name); 1854 goto done; 1855 } 1856 } 1857 din = dataconn(name, -1, "r"); 1858 if (din == NULL) 1859 goto done; 1860 if (receive_data(din, fout) == 0) { 1861 if (unique) 1862 reply(226, "Transfer complete (unique file name:%s).", 1863 name); 1864 else 1865 reply(226, "Transfer complete."); 1866 } 1867 (void) fclose(din); 1868 data = -1; 1869 pdata = -1; 1870 done: 1871 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1872 (*closefunc)(fout); 1873 return; 1874 err: 1875 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1876 return; 1877 } 1878 1879 static FILE * 1880 getdatasock(char *mode) 1881 { 1882 int on = 1, s, t, tries; 1883 1884 if (data >= 0) 1885 return (fdopen(data, mode)); 1886 1887 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1888 if (s < 0) 1889 goto bad; 1890 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1891 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1892 /* anchor socket to avoid multi-homing problems */ 1893 data_source = ctrl_addr; 1894 data_source.su_port = htons(dataport); 1895 (void) seteuid(0); 1896 for (tries = 1; ; tries++) { 1897 /* 1898 * We should loop here since it's possible that 1899 * another ftpd instance has passed this point and is 1900 * trying to open a data connection in active mode now. 1901 * Until the other connection is opened, we'll be getting 1902 * EADDRINUSE because no SOCK_STREAM sockets in the system 1903 * can share both local and remote addresses, localIP:20 1904 * and *:* in this case. 1905 */ 1906 if (bind(s, (struct sockaddr *)&data_source, 1907 data_source.su_len) >= 0) 1908 break; 1909 if (errno != EADDRINUSE || tries > 10) 1910 goto bad; 1911 sleep(tries); 1912 } 1913 (void) seteuid(pw->pw_uid); 1914 #ifdef IP_TOS 1915 if (data_source.su_family == AF_INET) 1916 { 1917 on = IPTOS_THROUGHPUT; 1918 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1919 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1920 } 1921 #endif 1922 #ifdef TCP_NOPUSH 1923 /* 1924 * Turn off push flag to keep sender TCP from sending short packets 1925 * at the boundaries of each write(). 1926 */ 1927 on = 1; 1928 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1929 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1930 #endif 1931 return (fdopen(s, mode)); 1932 bad: 1933 /* Return the real value of errno (close may change it) */ 1934 t = errno; 1935 (void) seteuid(pw->pw_uid); 1936 (void) close(s); 1937 errno = t; 1938 return (NULL); 1939 } 1940 1941 static FILE * 1942 dataconn(char *name, off_t size, char *mode) 1943 { 1944 char sizebuf[32]; 1945 FILE *file; 1946 int retry = 0, tos, conerrno; 1947 1948 file_size = size; 1949 byte_count = 0; 1950 if (size != -1) 1951 (void) snprintf(sizebuf, sizeof(sizebuf), 1952 " (%jd bytes)", (intmax_t)size); 1953 else 1954 *sizebuf = '\0'; 1955 if (pdata >= 0) { 1956 union sockunion from; 1957 socklen_t fromlen = ctrl_addr.su_len; 1958 int flags, s; 1959 struct timeval timeout; 1960 fd_set set; 1961 1962 FD_ZERO(&set); 1963 FD_SET(pdata, &set); 1964 1965 timeout.tv_usec = 0; 1966 timeout.tv_sec = 120; 1967 1968 /* 1969 * Granted a socket is in the blocking I/O mode, 1970 * accept() will block after a successful select() 1971 * if the selected connection dies in between. 1972 * Therefore set the non-blocking I/O flag here. 1973 */ 1974 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1975 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1976 goto pdata_err; 1977 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1978 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1979 goto pdata_err; 1980 (void) close(pdata); 1981 pdata = s; 1982 /* 1983 * Unset the inherited non-blocking I/O flag 1984 * on the child socket so stdio can work on it. 1985 */ 1986 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1987 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1988 goto pdata_err; 1989 #ifdef IP_TOS 1990 if (from.su_family == AF_INET) 1991 { 1992 tos = IPTOS_THROUGHPUT; 1993 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1994 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1995 } 1996 #endif 1997 reply(150, "Opening %s mode data connection for '%s'%s.", 1998 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1999 return (fdopen(pdata, mode)); 2000 pdata_err: 2001 reply(425, "Can't open data connection."); 2002 (void) close(pdata); 2003 pdata = -1; 2004 return (NULL); 2005 } 2006 if (data >= 0) { 2007 reply(125, "Using existing data connection for '%s'%s.", 2008 name, sizebuf); 2009 usedefault = 1; 2010 return (fdopen(data, mode)); 2011 } 2012 if (usedefault) 2013 data_dest = his_addr; 2014 usedefault = 1; 2015 do { 2016 file = getdatasock(mode); 2017 if (file == NULL) { 2018 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 2019 2020 if (getnameinfo((struct sockaddr *)&data_source, 2021 data_source.su_len, 2022 hostbuf, sizeof(hostbuf) - 1, 2023 portbuf, sizeof(portbuf) - 1, 2024 NI_NUMERICHOST|NI_NUMERICSERV)) 2025 *hostbuf = *portbuf = 0; 2026 hostbuf[sizeof(hostbuf) - 1] = 0; 2027 portbuf[sizeof(portbuf) - 1] = 0; 2028 reply(425, "Can't create data socket (%s,%s): %s.", 2029 hostbuf, portbuf, strerror(errno)); 2030 return (NULL); 2031 } 2032 data = fileno(file); 2033 conerrno = 0; 2034 if (connect(data, (struct sockaddr *)&data_dest, 2035 data_dest.su_len) == 0) 2036 break; 2037 conerrno = errno; 2038 (void) fclose(file); 2039 data = -1; 2040 if (conerrno == EADDRINUSE) { 2041 sleep(swaitint); 2042 retry += swaitint; 2043 } else { 2044 break; 2045 } 2046 } while (retry <= swaitmax); 2047 if (conerrno != 0) { 2048 reply(425, "Can't build data connection: %s.", 2049 strerror(conerrno)); 2050 return (NULL); 2051 } 2052 reply(150, "Opening %s mode data connection for '%s'%s.", 2053 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2054 return (file); 2055 } 2056 2057 /* 2058 * A helper macro to avoid code duplication 2059 * in send_data() and receive_data(). 2060 * 2061 * XXX We have to block SIGURG during putc() because BSD stdio 2062 * is unable to restart interrupted write operations and hence 2063 * the entire buffer contents will be lost as soon as a write() 2064 * call indicates EINTR to stdio. 2065 */ 2066 #define FTPD_PUTC(ch, file, label) \ 2067 do { \ 2068 int ret; \ 2069 \ 2070 do { \ 2071 START_UNSAFE; \ 2072 ret = putc((ch), (file)); \ 2073 END_UNSAFE; \ 2074 CHECKOOB(return (-1)) \ 2075 else if (ferror(file)) \ 2076 goto label; \ 2077 clearerr(file); \ 2078 } while (ret == EOF); \ 2079 } while (0) 2080 2081 /* 2082 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2083 * encapsulation of the data subject to Mode, Structure, and Type. 2084 * 2085 * NB: Form isn't handled. 2086 */ 2087 static int 2088 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2089 { 2090 int c, cp, filefd, netfd; 2091 char *buf; 2092 2093 STARTXFER; 2094 2095 switch (type) { 2096 2097 case TYPE_A: 2098 cp = EOF; 2099 for (;;) { 2100 c = getc(instr); 2101 CHECKOOB(return (-1)) 2102 else if (c == EOF && ferror(instr)) 2103 goto file_err; 2104 if (c == EOF) { 2105 if (ferror(instr)) { /* resume after OOB */ 2106 clearerr(instr); 2107 continue; 2108 } 2109 if (feof(instr)) /* EOF */ 2110 break; 2111 syslog(LOG_ERR, "Internal: impossible condition" 2112 " on file after getc()"); 2113 goto file_err; 2114 } 2115 if (c == '\n' && cp != '\r') { 2116 FTPD_PUTC('\r', outstr, data_err); 2117 byte_count++; 2118 } 2119 FTPD_PUTC(c, outstr, data_err); 2120 byte_count++; 2121 cp = c; 2122 } 2123 #ifdef notyet /* BSD stdio isn't ready for that */ 2124 while (fflush(outstr) == EOF) { 2125 CHECKOOB(return (-1)) 2126 else 2127 goto data_err; 2128 clearerr(outstr); 2129 } 2130 ENDXFER; 2131 #else 2132 ENDXFER; 2133 if (fflush(outstr) == EOF) 2134 goto data_err; 2135 #endif 2136 reply(226, "Transfer complete."); 2137 return (0); 2138 2139 case TYPE_I: 2140 case TYPE_L: 2141 /* 2142 * isreg is only set if we are not doing restart and we 2143 * are sending a regular file 2144 */ 2145 netfd = fileno(outstr); 2146 filefd = fileno(instr); 2147 2148 if (isreg) { 2149 char *msg = "Transfer complete."; 2150 off_t cnt, offset; 2151 int err; 2152 2153 cnt = offset = 0; 2154 2155 while (filesize > 0) { 2156 err = sendfile(filefd, netfd, offset, 0, 2157 NULL, &cnt, 0); 2158 /* 2159 * Calculate byte_count before OOB processing. 2160 * It can be used in myoob() later. 2161 */ 2162 byte_count += cnt; 2163 offset += cnt; 2164 filesize -= cnt; 2165 CHECKOOB(return (-1)) 2166 else if (err == -1) { 2167 if (errno != EINTR && 2168 cnt == 0 && offset == 0) 2169 goto oldway; 2170 goto data_err; 2171 } 2172 if (err == -1) /* resume after OOB */ 2173 continue; 2174 /* 2175 * We hit the EOF prematurely. 2176 * Perhaps the file was externally truncated. 2177 */ 2178 if (cnt == 0) { 2179 msg = "Transfer finished due to " 2180 "premature end of file."; 2181 break; 2182 } 2183 } 2184 ENDXFER; 2185 reply(226, "%s", msg); 2186 return (0); 2187 } 2188 2189 oldway: 2190 if ((buf = malloc(blksize)) == NULL) { 2191 ENDXFER; 2192 reply(451, "Ran out of memory."); 2193 return (-1); 2194 } 2195 2196 for (;;) { 2197 int cnt, len; 2198 char *bp; 2199 2200 cnt = read(filefd, buf, blksize); 2201 CHECKOOB(free(buf); return (-1)) 2202 else if (cnt < 0) { 2203 free(buf); 2204 goto file_err; 2205 } 2206 if (cnt < 0) /* resume after OOB */ 2207 continue; 2208 if (cnt == 0) /* EOF */ 2209 break; 2210 for (len = cnt, bp = buf; len > 0;) { 2211 cnt = write(netfd, bp, len); 2212 CHECKOOB(free(buf); return (-1)) 2213 else if (cnt < 0) { 2214 free(buf); 2215 goto data_err; 2216 } 2217 if (cnt <= 0) 2218 continue; 2219 len -= cnt; 2220 bp += cnt; 2221 byte_count += cnt; 2222 } 2223 } 2224 ENDXFER; 2225 free(buf); 2226 reply(226, "Transfer complete."); 2227 return (0); 2228 default: 2229 ENDXFER; 2230 reply(550, "Unimplemented TYPE %d in send_data.", type); 2231 return (-1); 2232 } 2233 2234 data_err: 2235 ENDXFER; 2236 perror_reply(426, "Data connection"); 2237 return (-1); 2238 2239 file_err: 2240 ENDXFER; 2241 perror_reply(551, "Error on input file"); 2242 return (-1); 2243 } 2244 2245 /* 2246 * Transfer data from peer to "outstr" using the appropriate encapulation of 2247 * the data subject to Mode, Structure, and Type. 2248 * 2249 * N.B.: Form isn't handled. 2250 */ 2251 static int 2252 receive_data(FILE *instr, FILE *outstr) 2253 { 2254 int c, cp; 2255 int bare_lfs = 0; 2256 2257 STARTXFER; 2258 2259 switch (type) { 2260 2261 case TYPE_I: 2262 case TYPE_L: 2263 for (;;) { 2264 int cnt, len; 2265 char *bp; 2266 char buf[BUFSIZ]; 2267 2268 cnt = read(fileno(instr), buf, sizeof(buf)); 2269 CHECKOOB(return (-1)) 2270 else if (cnt < 0) 2271 goto data_err; 2272 if (cnt < 0) /* resume after OOB */ 2273 continue; 2274 if (cnt == 0) /* EOF */ 2275 break; 2276 for (len = cnt, bp = buf; len > 0;) { 2277 cnt = write(fileno(outstr), bp, len); 2278 CHECKOOB(return (-1)) 2279 else if (cnt < 0) 2280 goto file_err; 2281 if (cnt <= 0) 2282 continue; 2283 len -= cnt; 2284 bp += cnt; 2285 byte_count += cnt; 2286 } 2287 } 2288 ENDXFER; 2289 return (0); 2290 2291 case TYPE_E: 2292 ENDXFER; 2293 reply(553, "TYPE E not implemented."); 2294 return (-1); 2295 2296 case TYPE_A: 2297 cp = EOF; 2298 for (;;) { 2299 c = getc(instr); 2300 CHECKOOB(return (-1)) 2301 else if (c == EOF && ferror(instr)) 2302 goto data_err; 2303 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2304 clearerr(instr); 2305 continue; 2306 } 2307 2308 if (cp == '\r') { 2309 if (c != '\n') 2310 FTPD_PUTC('\r', outstr, file_err); 2311 } else 2312 if (c == '\n') 2313 bare_lfs++; 2314 if (c == '\r') { 2315 byte_count++; 2316 cp = c; 2317 continue; 2318 } 2319 2320 /* Check for EOF here in order not to lose last \r. */ 2321 if (c == EOF) { 2322 if (feof(instr)) /* EOF */ 2323 break; 2324 syslog(LOG_ERR, "Internal: impossible condition" 2325 " on data stream after getc()"); 2326 goto data_err; 2327 } 2328 2329 byte_count++; 2330 FTPD_PUTC(c, outstr, file_err); 2331 cp = c; 2332 } 2333 #ifdef notyet /* BSD stdio isn't ready for that */ 2334 while (fflush(outstr) == EOF) { 2335 CHECKOOB(return (-1)) 2336 else 2337 goto file_err; 2338 clearerr(outstr); 2339 } 2340 ENDXFER; 2341 #else 2342 ENDXFER; 2343 if (fflush(outstr) == EOF) 2344 goto file_err; 2345 #endif 2346 if (bare_lfs) { 2347 lreply(226, 2348 "WARNING! %d bare linefeeds received in ASCII mode.", 2349 bare_lfs); 2350 (void)printf(" File may not have transferred correctly.\r\n"); 2351 } 2352 return (0); 2353 default: 2354 ENDXFER; 2355 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2356 return (-1); 2357 } 2358 2359 data_err: 2360 ENDXFER; 2361 perror_reply(426, "Data connection"); 2362 return (-1); 2363 2364 file_err: 2365 ENDXFER; 2366 perror_reply(452, "Error writing to file"); 2367 return (-1); 2368 } 2369 2370 void 2371 statfilecmd(char *filename) 2372 { 2373 FILE *fin; 2374 int atstart; 2375 int c, code; 2376 char line[LINE_MAX]; 2377 struct stat st; 2378 2379 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2380 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2381 fin = ftpd_popen(line, "r"); 2382 if (fin == NULL) { 2383 perror_reply(551, filename); 2384 return; 2385 } 2386 lreply(code, "Status of %s:", filename); 2387 atstart = 1; 2388 while ((c = getc(fin)) != EOF) { 2389 if (c == '\n') { 2390 if (ferror(stdout)){ 2391 perror_reply(421, "Control connection"); 2392 (void) ftpd_pclose(fin); 2393 dologout(1); 2394 /* NOTREACHED */ 2395 } 2396 if (ferror(fin)) { 2397 perror_reply(551, filename); 2398 (void) ftpd_pclose(fin); 2399 return; 2400 } 2401 (void) putc('\r', stdout); 2402 } 2403 /* 2404 * RFC 959 says neutral text should be prepended before 2405 * a leading 3-digit number followed by whitespace, but 2406 * many ftp clients can be confused by any leading digits, 2407 * as a matter of fact. 2408 */ 2409 if (atstart && isdigit(c)) 2410 (void) putc(' ', stdout); 2411 (void) putc(c, stdout); 2412 atstart = (c == '\n'); 2413 } 2414 (void) ftpd_pclose(fin); 2415 reply(code, "End of status."); 2416 } 2417 2418 void 2419 statcmd(void) 2420 { 2421 union sockunion *su; 2422 u_char *a, *p; 2423 char hname[NI_MAXHOST]; 2424 int ispassive; 2425 2426 if (hostinfo) { 2427 lreply(211, "%s FTP server status:", hostname); 2428 printf(" %s\r\n", version); 2429 } else 2430 lreply(211, "FTP server status:"); 2431 printf(" Connected to %s", remotehost); 2432 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2433 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2434 hname[sizeof(hname) - 1] = 0; 2435 if (strcmp(hname, remotehost) != 0) 2436 printf(" (%s)", hname); 2437 } 2438 printf("\r\n"); 2439 if (logged_in) { 2440 if (guest) 2441 printf(" Logged in anonymously\r\n"); 2442 else 2443 printf(" Logged in as %s\r\n", pw->pw_name); 2444 } else if (askpasswd) 2445 printf(" Waiting for password\r\n"); 2446 else 2447 printf(" Waiting for user name\r\n"); 2448 printf(" TYPE: %s", typenames[type]); 2449 if (type == TYPE_A || type == TYPE_E) 2450 printf(", FORM: %s", formnames[form]); 2451 if (type == TYPE_L) 2452 #if CHAR_BIT == 8 2453 printf(" %d", CHAR_BIT); 2454 #else 2455 printf(" %d", bytesize); /* need definition! */ 2456 #endif 2457 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2458 strunames[stru], modenames[mode]); 2459 if (data != -1) 2460 printf(" Data connection open\r\n"); 2461 else if (pdata != -1) { 2462 ispassive = 1; 2463 su = &pasv_addr; 2464 goto printaddr; 2465 } else if (usedefault == 0) { 2466 ispassive = 0; 2467 su = &data_dest; 2468 printaddr: 2469 #define UC(b) (((int) b) & 0xff) 2470 if (epsvall) { 2471 printf(" EPSV only mode (EPSV ALL)\r\n"); 2472 goto epsvonly; 2473 } 2474 2475 /* PORT/PASV */ 2476 if (su->su_family == AF_INET) { 2477 a = (u_char *) &su->su_sin.sin_addr; 2478 p = (u_char *) &su->su_sin.sin_port; 2479 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2480 ispassive ? "PASV" : "PORT", 2481 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2482 UC(p[0]), UC(p[1])); 2483 } 2484 2485 /* LPRT/LPSV */ 2486 { 2487 int alen, af, i; 2488 2489 switch (su->su_family) { 2490 case AF_INET: 2491 a = (u_char *) &su->su_sin.sin_addr; 2492 p = (u_char *) &su->su_sin.sin_port; 2493 alen = sizeof(su->su_sin.sin_addr); 2494 af = 4; 2495 break; 2496 case AF_INET6: 2497 a = (u_char *) &su->su_sin6.sin6_addr; 2498 p = (u_char *) &su->su_sin6.sin6_port; 2499 alen = sizeof(su->su_sin6.sin6_addr); 2500 af = 6; 2501 break; 2502 default: 2503 af = 0; 2504 break; 2505 } 2506 if (af) { 2507 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2508 af, alen); 2509 for (i = 0; i < alen; i++) 2510 printf("%d,", UC(a[i])); 2511 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2512 } 2513 } 2514 2515 epsvonly:; 2516 /* EPRT/EPSV */ 2517 { 2518 int af; 2519 2520 switch (su->su_family) { 2521 case AF_INET: 2522 af = 1; 2523 break; 2524 case AF_INET6: 2525 af = 2; 2526 break; 2527 default: 2528 af = 0; 2529 break; 2530 } 2531 if (af) { 2532 union sockunion tmp; 2533 2534 tmp = *su; 2535 if (tmp.su_family == AF_INET6) 2536 tmp.su_sin6.sin6_scope_id = 0; 2537 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2538 hname, sizeof(hname) - 1, NULL, 0, 2539 NI_NUMERICHOST)) { 2540 hname[sizeof(hname) - 1] = 0; 2541 printf(" %s |%d|%s|%d|\r\n", 2542 ispassive ? "EPSV" : "EPRT", 2543 af, hname, htons(tmp.su_port)); 2544 } 2545 } 2546 } 2547 #undef UC 2548 } else 2549 printf(" No data connection\r\n"); 2550 reply(211, "End of status."); 2551 } 2552 2553 void 2554 fatalerror(char *s) 2555 { 2556 2557 reply(451, "Error in server: %s", s); 2558 reply(221, "Closing connection due to server error."); 2559 dologout(0); 2560 /* NOTREACHED */ 2561 } 2562 2563 void 2564 reply(int n, const char *fmt, ...) 2565 { 2566 va_list ap; 2567 2568 (void)printf("%d ", n); 2569 va_start(ap, fmt); 2570 (void)vprintf(fmt, ap); 2571 va_end(ap); 2572 (void)printf("\r\n"); 2573 (void)fflush(stdout); 2574 if (ftpdebug) { 2575 syslog(LOG_DEBUG, "<--- %d ", n); 2576 va_start(ap, fmt); 2577 vsyslog(LOG_DEBUG, fmt, ap); 2578 va_end(ap); 2579 } 2580 } 2581 2582 void 2583 lreply(int n, const char *fmt, ...) 2584 { 2585 va_list ap; 2586 2587 (void)printf("%d- ", n); 2588 va_start(ap, fmt); 2589 (void)vprintf(fmt, ap); 2590 va_end(ap); 2591 (void)printf("\r\n"); 2592 (void)fflush(stdout); 2593 if (ftpdebug) { 2594 syslog(LOG_DEBUG, "<--- %d- ", n); 2595 va_start(ap, fmt); 2596 vsyslog(LOG_DEBUG, fmt, ap); 2597 va_end(ap); 2598 } 2599 } 2600 2601 static void 2602 ack(char *s) 2603 { 2604 2605 reply(250, "%s command successful.", s); 2606 } 2607 2608 void 2609 nack(char *s) 2610 { 2611 2612 reply(502, "%s command not implemented.", s); 2613 } 2614 2615 /* ARGSUSED */ 2616 void 2617 yyerror(char *s) 2618 { 2619 char *cp; 2620 2621 if ((cp = strchr(cbuf,'\n'))) 2622 *cp = '\0'; 2623 reply(500, "%s: command not understood.", cbuf); 2624 } 2625 2626 void 2627 delete(char *name) 2628 { 2629 struct stat st; 2630 2631 LOGCMD("delete", name); 2632 if (lstat(name, &st) < 0) { 2633 perror_reply(550, name); 2634 return; 2635 } 2636 if (S_ISDIR(st.st_mode)) { 2637 if (rmdir(name) < 0) { 2638 perror_reply(550, name); 2639 return; 2640 } 2641 goto done; 2642 } 2643 if (guest && noguestmod) { 2644 reply(550, "Operation not permitted."); 2645 return; 2646 } 2647 if (unlink(name) < 0) { 2648 perror_reply(550, name); 2649 return; 2650 } 2651 done: 2652 ack("DELE"); 2653 } 2654 2655 void 2656 cwd(char *path) 2657 { 2658 2659 if (chdir(path) < 0) 2660 perror_reply(550, path); 2661 else 2662 ack("CWD"); 2663 } 2664 2665 void 2666 makedir(char *name) 2667 { 2668 char *s; 2669 2670 LOGCMD("mkdir", name); 2671 if (guest && noguestmkd) 2672 reply(550, "Operation not permitted."); 2673 else if (mkdir(name, 0777) < 0) 2674 perror_reply(550, name); 2675 else { 2676 if ((s = doublequote(name)) == NULL) 2677 fatalerror("Ran out of memory."); 2678 reply(257, "\"%s\" directory created.", s); 2679 free(s); 2680 } 2681 } 2682 2683 void 2684 removedir(char *name) 2685 { 2686 2687 LOGCMD("rmdir", name); 2688 if (rmdir(name) < 0) 2689 perror_reply(550, name); 2690 else 2691 ack("RMD"); 2692 } 2693 2694 void 2695 pwd(void) 2696 { 2697 char *s, path[MAXPATHLEN + 1]; 2698 2699 if (getcwd(path, sizeof(path)) == NULL) 2700 perror_reply(550, "Get current directory"); 2701 else { 2702 if ((s = doublequote(path)) == NULL) 2703 fatalerror("Ran out of memory."); 2704 reply(257, "\"%s\" is current directory.", s); 2705 free(s); 2706 } 2707 } 2708 2709 char * 2710 renamefrom(char *name) 2711 { 2712 struct stat st; 2713 2714 if (guest && noguestmod) { 2715 reply(550, "Operation not permitted."); 2716 return (NULL); 2717 } 2718 if (lstat(name, &st) < 0) { 2719 perror_reply(550, name); 2720 return (NULL); 2721 } 2722 reply(350, "File exists, ready for destination name."); 2723 return (name); 2724 } 2725 2726 void 2727 renamecmd(char *from, char *to) 2728 { 2729 struct stat st; 2730 2731 LOGCMD2("rename", from, to); 2732 2733 if (guest && (stat(to, &st) == 0)) { 2734 reply(550, "%s: permission denied.", to); 2735 return; 2736 } 2737 2738 if (rename(from, to) < 0) 2739 perror_reply(550, "rename"); 2740 else 2741 ack("RNTO"); 2742 } 2743 2744 static void 2745 dolog(struct sockaddr *who) 2746 { 2747 char who_name[NI_MAXHOST]; 2748 2749 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2750 remotehost[sizeof(remotehost) - 1] = 0; 2751 if (getnameinfo(who, who->sa_len, 2752 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2753 *who_name = 0; 2754 who_name[sizeof(who_name) - 1] = 0; 2755 2756 #ifdef SETPROCTITLE 2757 #ifdef VIRTUAL_HOSTING 2758 if (thishost != firsthost) 2759 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2760 remotehost, hostname); 2761 else 2762 #endif 2763 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2764 remotehost); 2765 setproctitle("%s", proctitle); 2766 #endif /* SETPROCTITLE */ 2767 2768 if (logging) { 2769 #ifdef VIRTUAL_HOSTING 2770 if (thishost != firsthost) 2771 syslog(LOG_INFO, "connection from %s (%s) to %s", 2772 remotehost, who_name, hostname); 2773 else 2774 #endif 2775 syslog(LOG_INFO, "connection from %s (%s)", 2776 remotehost, who_name); 2777 } 2778 } 2779 2780 /* 2781 * Record logout in wtmp file 2782 * and exit with supplied status. 2783 */ 2784 void 2785 dologout(int status) 2786 { 2787 2788 if (logged_in && dowtmp) { 2789 (void) seteuid(0); 2790 #ifdef LOGIN_CAP 2791 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 2792 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 2793 LOGIN_SETENV)); 2794 #endif 2795 ftpd_logwtmp(wtmpid, NULL, NULL); 2796 } 2797 /* beware of flushing buffers after a SIGPIPE */ 2798 _exit(status); 2799 } 2800 2801 static void 2802 sigurg(int signo) 2803 { 2804 2805 recvurg = 1; 2806 } 2807 2808 static void 2809 maskurg(int flag) 2810 { 2811 int oerrno; 2812 sigset_t sset; 2813 2814 if (!transflag) { 2815 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2816 return; 2817 } 2818 oerrno = errno; 2819 sigemptyset(&sset); 2820 sigaddset(&sset, SIGURG); 2821 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2822 errno = oerrno; 2823 } 2824 2825 static void 2826 flagxfer(int flag) 2827 { 2828 2829 if (flag) { 2830 if (transflag) 2831 syslog(LOG_ERR, "Internal: flagxfer(1): " 2832 "transfer already under way"); 2833 transflag = 1; 2834 maskurg(0); 2835 recvurg = 0; 2836 } else { 2837 if (!transflag) 2838 syslog(LOG_ERR, "Internal: flagxfer(0): " 2839 "no active transfer"); 2840 maskurg(1); 2841 transflag = 0; 2842 } 2843 } 2844 2845 /* 2846 * Returns 0 if OK to resume or -1 if abort requested. 2847 */ 2848 static int 2849 myoob(void) 2850 { 2851 char *cp; 2852 int ret; 2853 2854 if (!transflag) { 2855 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2856 return (0); 2857 } 2858 cp = tmpline; 2859 ret = get_line(cp, 7, stdin); 2860 if (ret == -1) { 2861 reply(221, "You could at least say goodbye."); 2862 dologout(0); 2863 } else if (ret == -2) { 2864 /* Ignore truncated command. */ 2865 return (0); 2866 } 2867 upper(cp); 2868 if (strcmp(cp, "ABOR\r\n") == 0) { 2869 tmpline[0] = '\0'; 2870 reply(426, "Transfer aborted. Data connection closed."); 2871 reply(226, "Abort successful."); 2872 return (-1); 2873 } 2874 if (strcmp(cp, "STAT\r\n") == 0) { 2875 tmpline[0] = '\0'; 2876 if (file_size != -1) 2877 reply(213, "Status: %jd of %jd bytes transferred.", 2878 (intmax_t)byte_count, (intmax_t)file_size); 2879 else 2880 reply(213, "Status: %jd bytes transferred.", 2881 (intmax_t)byte_count); 2882 } 2883 return (0); 2884 } 2885 2886 /* 2887 * Note: a response of 425 is not mentioned as a possible response to 2888 * the PASV command in RFC959. However, it has been blessed as 2889 * a legitimate response by Jon Postel in a telephone conversation 2890 * with Rick Adams on 25 Jan 89. 2891 */ 2892 void 2893 passive(void) 2894 { 2895 socklen_t len; 2896 int on; 2897 char *p, *a; 2898 2899 if (pdata >= 0) /* close old port if one set */ 2900 close(pdata); 2901 2902 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2903 if (pdata < 0) { 2904 perror_reply(425, "Can't open passive connection"); 2905 return; 2906 } 2907 on = 1; 2908 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2909 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2910 2911 (void) seteuid(0); 2912 2913 #ifdef IP_PORTRANGE 2914 if (ctrl_addr.su_family == AF_INET) { 2915 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2916 : IP_PORTRANGE_DEFAULT; 2917 2918 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2919 &on, sizeof(on)) < 0) 2920 goto pasv_error; 2921 } 2922 #endif 2923 #ifdef IPV6_PORTRANGE 2924 if (ctrl_addr.su_family == AF_INET6) { 2925 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2926 : IPV6_PORTRANGE_DEFAULT; 2927 2928 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2929 &on, sizeof(on)) < 0) 2930 goto pasv_error; 2931 } 2932 #endif 2933 2934 pasv_addr = ctrl_addr; 2935 pasv_addr.su_port = 0; 2936 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2937 goto pasv_error; 2938 2939 (void) seteuid(pw->pw_uid); 2940 2941 len = sizeof(pasv_addr); 2942 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2943 goto pasv_error; 2944 if (listen(pdata, 1) < 0) 2945 goto pasv_error; 2946 if (pasv_addr.su_family == AF_INET) 2947 a = (char *) &pasv_addr.su_sin.sin_addr; 2948 else if (pasv_addr.su_family == AF_INET6 && 2949 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2950 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2951 else 2952 goto pasv_error; 2953 2954 p = (char *) &pasv_addr.su_port; 2955 2956 #define UC(b) (((int) b) & 0xff) 2957 2958 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2959 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2960 return; 2961 2962 pasv_error: 2963 (void) seteuid(pw->pw_uid); 2964 (void) close(pdata); 2965 pdata = -1; 2966 perror_reply(425, "Can't open passive connection"); 2967 return; 2968 } 2969 2970 /* 2971 * Long Passive defined in RFC 1639. 2972 * 228 Entering Long Passive Mode 2973 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2974 */ 2975 2976 void 2977 long_passive(char *cmd, int pf) 2978 { 2979 socklen_t len; 2980 int on; 2981 char *p, *a; 2982 2983 if (pdata >= 0) /* close old port if one set */ 2984 close(pdata); 2985 2986 if (pf != PF_UNSPEC) { 2987 if (ctrl_addr.su_family != pf) { 2988 switch (ctrl_addr.su_family) { 2989 case AF_INET: 2990 pf = 1; 2991 break; 2992 case AF_INET6: 2993 pf = 2; 2994 break; 2995 default: 2996 pf = 0; 2997 break; 2998 } 2999 /* 3000 * XXX 3001 * only EPRT/EPSV ready clients will understand this 3002 */ 3003 if (strcmp(cmd, "EPSV") == 0 && pf) { 3004 reply(522, "Network protocol mismatch, " 3005 "use (%d)", pf); 3006 } else 3007 reply(501, "Network protocol mismatch."); /*XXX*/ 3008 3009 return; 3010 } 3011 } 3012 3013 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 3014 if (pdata < 0) { 3015 perror_reply(425, "Can't open passive connection"); 3016 return; 3017 } 3018 on = 1; 3019 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 3020 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 3021 3022 (void) seteuid(0); 3023 3024 pasv_addr = ctrl_addr; 3025 pasv_addr.su_port = 0; 3026 len = pasv_addr.su_len; 3027 3028 #ifdef IP_PORTRANGE 3029 if (ctrl_addr.su_family == AF_INET) { 3030 on = restricted_data_ports ? IP_PORTRANGE_HIGH 3031 : IP_PORTRANGE_DEFAULT; 3032 3033 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 3034 &on, sizeof(on)) < 0) 3035 goto pasv_error; 3036 } 3037 #endif 3038 #ifdef IPV6_PORTRANGE 3039 if (ctrl_addr.su_family == AF_INET6) { 3040 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 3041 : IPV6_PORTRANGE_DEFAULT; 3042 3043 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 3044 &on, sizeof(on)) < 0) 3045 goto pasv_error; 3046 } 3047 #endif 3048 3049 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 3050 goto pasv_error; 3051 3052 (void) seteuid(pw->pw_uid); 3053 3054 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 3055 goto pasv_error; 3056 if (listen(pdata, 1) < 0) 3057 goto pasv_error; 3058 3059 #define UC(b) (((int) b) & 0xff) 3060 3061 if (strcmp(cmd, "LPSV") == 0) { 3062 p = (char *)&pasv_addr.su_port; 3063 switch (pasv_addr.su_family) { 3064 case AF_INET: 3065 a = (char *) &pasv_addr.su_sin.sin_addr; 3066 v4_reply: 3067 reply(228, 3068 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3069 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3070 2, UC(p[0]), UC(p[1])); 3071 return; 3072 case AF_INET6: 3073 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3074 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3075 goto v4_reply; 3076 } 3077 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3078 reply(228, 3079 "Entering Long Passive Mode " 3080 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3081 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3082 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3083 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3084 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3085 2, UC(p[0]), UC(p[1])); 3086 return; 3087 } 3088 } else if (strcmp(cmd, "EPSV") == 0) { 3089 switch (pasv_addr.su_family) { 3090 case AF_INET: 3091 case AF_INET6: 3092 reply(229, "Entering Extended Passive Mode (|||%d|)", 3093 ntohs(pasv_addr.su_port)); 3094 return; 3095 } 3096 } else { 3097 /* more proper error code? */ 3098 } 3099 3100 pasv_error: 3101 (void) seteuid(pw->pw_uid); 3102 (void) close(pdata); 3103 pdata = -1; 3104 perror_reply(425, "Can't open passive connection"); 3105 return; 3106 } 3107 3108 /* 3109 * Generate unique name for file with basename "local" 3110 * and open the file in order to avoid possible races. 3111 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3112 * Return descriptor to the file, set "name" to its name. 3113 * 3114 * Generates failure reply on error. 3115 */ 3116 static int 3117 guniquefd(char *local, char **name) 3118 { 3119 static char new[MAXPATHLEN]; 3120 struct stat st; 3121 char *cp; 3122 int count; 3123 int fd; 3124 3125 cp = strrchr(local, '/'); 3126 if (cp) 3127 *cp = '\0'; 3128 if (stat(cp ? local : ".", &st) < 0) { 3129 perror_reply(553, cp ? local : "."); 3130 return (-1); 3131 } 3132 if (cp) { 3133 /* 3134 * Let not overwrite dirname with counter suffix. 3135 * -4 is for /nn\0 3136 * In this extreme case dot won't be put in front of suffix. 3137 */ 3138 if (strlen(local) > sizeof(new) - 4) { 3139 reply(553, "Pathname too long."); 3140 return (-1); 3141 } 3142 *cp = '/'; 3143 } 3144 /* -4 is for the .nn<null> we put on the end below */ 3145 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3146 cp = new + strlen(new); 3147 /* 3148 * Don't generate dotfile unless requested explicitly. 3149 * This covers the case when basename gets truncated off 3150 * by buffer size. 3151 */ 3152 if (cp > new && cp[-1] != '/') 3153 *cp++ = '.'; 3154 for (count = 0; count < 100; count++) { 3155 /* At count 0 try unmodified name */ 3156 if (count) 3157 (void)sprintf(cp, "%d", count); 3158 if ((fd = open(count ? new : local, 3159 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3160 *name = count ? new : local; 3161 return (fd); 3162 } 3163 if (errno != EEXIST) { 3164 perror_reply(553, count ? new : local); 3165 return (-1); 3166 } 3167 } 3168 reply(452, "Unique file name cannot be created."); 3169 return (-1); 3170 } 3171 3172 /* 3173 * Format and send reply containing system error number. 3174 */ 3175 void 3176 perror_reply(int code, char *string) 3177 { 3178 3179 reply(code, "%s: %s.", string, strerror(errno)); 3180 } 3181 3182 static char *onefile[] = { 3183 "", 3184 0 3185 }; 3186 3187 void 3188 send_file_list(char *whichf) 3189 { 3190 struct stat st; 3191 DIR *dirp = NULL; 3192 struct dirent *dir; 3193 FILE *dout = NULL; 3194 char **dirlist, *dirname; 3195 int simple = 0; 3196 int freeglob = 0; 3197 glob_t gl; 3198 3199 if (strpbrk(whichf, "~{[*?") != NULL) { 3200 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3201 3202 memset(&gl, 0, sizeof(gl)); 3203 gl.gl_matchc = MAXGLOBARGS; 3204 flags |= GLOB_LIMIT; 3205 freeglob = 1; 3206 if (glob(whichf, flags, 0, &gl)) { 3207 reply(550, "No matching files found."); 3208 goto out; 3209 } else if (gl.gl_pathc == 0) { 3210 errno = ENOENT; 3211 perror_reply(550, whichf); 3212 goto out; 3213 } 3214 dirlist = gl.gl_pathv; 3215 } else { 3216 onefile[0] = whichf; 3217 dirlist = onefile; 3218 simple = 1; 3219 } 3220 3221 while ((dirname = *dirlist++)) { 3222 if (stat(dirname, &st) < 0) { 3223 /* 3224 * If user typed "ls -l", etc, and the client 3225 * used NLST, do what the user meant. 3226 */ 3227 if (dirname[0] == '-' && *dirlist == NULL && 3228 dout == NULL) 3229 retrieve(_PATH_LS " %s", dirname); 3230 else 3231 perror_reply(550, whichf); 3232 goto out; 3233 } 3234 3235 if (S_ISREG(st.st_mode)) { 3236 if (dout == NULL) { 3237 dout = dataconn("file list", -1, "w"); 3238 if (dout == NULL) 3239 goto out; 3240 STARTXFER; 3241 } 3242 START_UNSAFE; 3243 fprintf(dout, "%s%s\n", dirname, 3244 type == TYPE_A ? "\r" : ""); 3245 END_UNSAFE; 3246 if (ferror(dout)) 3247 goto data_err; 3248 byte_count += strlen(dirname) + 3249 (type == TYPE_A ? 2 : 1); 3250 CHECKOOB(goto abrt); 3251 continue; 3252 } else if (!S_ISDIR(st.st_mode)) 3253 continue; 3254 3255 if ((dirp = opendir(dirname)) == NULL) 3256 continue; 3257 3258 while ((dir = readdir(dirp)) != NULL) { 3259 char nbuf[MAXPATHLEN]; 3260 3261 CHECKOOB(goto abrt); 3262 3263 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3264 continue; 3265 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3266 dir->d_namlen == 2) 3267 continue; 3268 3269 snprintf(nbuf, sizeof(nbuf), 3270 "%s/%s", dirname, dir->d_name); 3271 3272 /* 3273 * We have to do a stat to insure it's 3274 * not a directory or special file. 3275 */ 3276 if (simple || (stat(nbuf, &st) == 0 && 3277 S_ISREG(st.st_mode))) { 3278 if (dout == NULL) { 3279 dout = dataconn("file list", -1, "w"); 3280 if (dout == NULL) 3281 goto out; 3282 STARTXFER; 3283 } 3284 START_UNSAFE; 3285 if (nbuf[0] == '.' && nbuf[1] == '/') 3286 fprintf(dout, "%s%s\n", &nbuf[2], 3287 type == TYPE_A ? "\r" : ""); 3288 else 3289 fprintf(dout, "%s%s\n", nbuf, 3290 type == TYPE_A ? "\r" : ""); 3291 END_UNSAFE; 3292 if (ferror(dout)) 3293 goto data_err; 3294 byte_count += strlen(nbuf) + 3295 (type == TYPE_A ? 2 : 1); 3296 CHECKOOB(goto abrt); 3297 } 3298 } 3299 (void) closedir(dirp); 3300 dirp = NULL; 3301 } 3302 3303 if (dout == NULL) 3304 reply(550, "No files found."); 3305 else if (ferror(dout)) 3306 data_err: perror_reply(550, "Data connection"); 3307 else 3308 reply(226, "Transfer complete."); 3309 out: 3310 if (dout) { 3311 ENDXFER; 3312 abrt: 3313 (void) fclose(dout); 3314 data = -1; 3315 pdata = -1; 3316 } 3317 if (dirp) 3318 (void) closedir(dirp); 3319 if (freeglob) { 3320 freeglob = 0; 3321 globfree(&gl); 3322 } 3323 } 3324 3325 void 3326 reapchild(int signo) 3327 { 3328 while (waitpid(-1, NULL, WNOHANG) > 0); 3329 } 3330 3331 #ifdef OLD_SETPROCTITLE 3332 /* 3333 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3334 * Warning, since this is usually started from inetd.conf, it often doesn't 3335 * have much of an environment or arglist to overwrite. 3336 */ 3337 void 3338 setproctitle(const char *fmt, ...) 3339 { 3340 int i; 3341 va_list ap; 3342 char *p, *bp, ch; 3343 char buf[LINE_MAX]; 3344 3345 va_start(ap, fmt); 3346 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3347 3348 /* make ps print our process name */ 3349 p = Argv[0]; 3350 *p++ = '-'; 3351 3352 i = strlen(buf); 3353 if (i > LastArgv - p - 2) { 3354 i = LastArgv - p - 2; 3355 buf[i] = '\0'; 3356 } 3357 bp = buf; 3358 while (ch = *bp++) 3359 if (ch != '\n' && ch != '\r') 3360 *p++ = ch; 3361 while (p < LastArgv) 3362 *p++ = ' '; 3363 } 3364 #endif /* OLD_SETPROCTITLE */ 3365 3366 static void 3367 appendf(char **strp, char *fmt, ...) 3368 { 3369 va_list ap; 3370 char *ostr, *p; 3371 3372 va_start(ap, fmt); 3373 vasprintf(&p, fmt, ap); 3374 va_end(ap); 3375 if (p == NULL) 3376 fatalerror("Ran out of memory."); 3377 if (*strp == NULL) 3378 *strp = p; 3379 else { 3380 ostr = *strp; 3381 asprintf(strp, "%s%s", ostr, p); 3382 if (*strp == NULL) 3383 fatalerror("Ran out of memory."); 3384 free(ostr); 3385 } 3386 } 3387 3388 static void 3389 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3390 { 3391 char *msg = NULL; 3392 char wd[MAXPATHLEN + 1]; 3393 3394 if (logging <= 1) 3395 return; 3396 3397 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3398 strcpy(wd, strerror(errno)); 3399 3400 appendf(&msg, "%s", cmd); 3401 if (file1) 3402 appendf(&msg, " %s", file1); 3403 if (file2) 3404 appendf(&msg, " %s", file2); 3405 if (cnt >= 0) 3406 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3407 appendf(&msg, " (wd: %s", wd); 3408 if (guest || dochroot) 3409 appendf(&msg, "; chrooted"); 3410 appendf(&msg, ")"); 3411 syslog(LOG_INFO, "%s", msg); 3412 free(msg); 3413 } 3414 3415 static void 3416 logxfer(char *name, off_t size, time_t start) 3417 { 3418 char buf[MAXPATHLEN + 1024]; 3419 char path[MAXPATHLEN + 1]; 3420 time_t now; 3421 3422 if (statfd >= 0) { 3423 time(&now); 3424 if (realpath(name, path) == NULL) { 3425 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3426 return; 3427 } 3428 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3429 ctime(&now)+4, ident, remotehost, 3430 path, (intmax_t)size, 3431 (long)(now - start + (now == start))); 3432 write(statfd, buf, strlen(buf)); 3433 } 3434 } 3435 3436 static char * 3437 doublequote(char *s) 3438 { 3439 int n; 3440 char *p, *s2; 3441 3442 for (p = s, n = 0; *p; p++) 3443 if (*p == '"') 3444 n++; 3445 3446 if ((s2 = malloc(p - s + n + 1)) == NULL) 3447 return (NULL); 3448 3449 for (p = s2; *s; s++, p++) { 3450 if ((*p = *s) == '"') 3451 *(++p) = '"'; 3452 } 3453 *p = '\0'; 3454 3455 return (s2); 3456 } 3457 3458 /* setup server socket for specified address family */ 3459 /* if af is PF_UNSPEC more than one socket may be returned */ 3460 /* the returned list is dynamically allocated, so caller needs to free it */ 3461 static int * 3462 socksetup(int af, char *bindname, const char *bindport) 3463 { 3464 struct addrinfo hints, *res, *r; 3465 int error, maxs, *s, *socks; 3466 const int on = 1; 3467 3468 memset(&hints, 0, sizeof(hints)); 3469 hints.ai_flags = AI_PASSIVE; 3470 hints.ai_family = af; 3471 hints.ai_socktype = SOCK_STREAM; 3472 error = getaddrinfo(bindname, bindport, &hints, &res); 3473 if (error) { 3474 syslog(LOG_ERR, "%s", gai_strerror(error)); 3475 if (error == EAI_SYSTEM) 3476 syslog(LOG_ERR, "%s", strerror(errno)); 3477 return NULL; 3478 } 3479 3480 /* Count max number of sockets we may open */ 3481 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3482 ; 3483 socks = malloc((maxs + 1) * sizeof(int)); 3484 if (!socks) { 3485 freeaddrinfo(res); 3486 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3487 return NULL; 3488 } 3489 3490 *socks = 0; /* num of sockets counter at start of array */ 3491 s = socks + 1; 3492 for (r = res; r; r = r->ai_next) { 3493 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3494 if (*s < 0) { 3495 syslog(LOG_DEBUG, "control socket: %m"); 3496 continue; 3497 } 3498 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3499 &on, sizeof(on)) < 0) 3500 syslog(LOG_WARNING, 3501 "control setsockopt (SO_REUSEADDR): %m"); 3502 if (r->ai_family == AF_INET6) { 3503 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3504 &on, sizeof(on)) < 0) 3505 syslog(LOG_WARNING, 3506 "control setsockopt (IPV6_V6ONLY): %m"); 3507 } 3508 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3509 syslog(LOG_DEBUG, "control bind: %m"); 3510 close(*s); 3511 continue; 3512 } 3513 (*socks)++; 3514 s++; 3515 } 3516 3517 if (res) 3518 freeaddrinfo(res); 3519 3520 if (*socks == 0) { 3521 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3522 free(socks); 3523 return NULL; 3524 } 3525 return(socks); 3526 } 3527