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 reply(550, "Can't set uid."); 1599 goto bad; 1600 } 1601 if (chdir(homedir) < 0) { 1602 if (guest || dochroot) { 1603 reply(550, "Can't change to base directory."); 1604 goto bad; 1605 } else { 1606 if (chdir("/") < 0) { 1607 reply(550, "Root is inaccessible."); 1608 goto bad; 1609 } 1610 lreply(230, "No directory! Logging in with home=/."); 1611 } 1612 } 1613 1614 /* 1615 * Display a login message, if it exists. 1616 * N.B. reply(230,) must follow the message. 1617 */ 1618 #ifdef VIRTUAL_HOSTING 1619 fd = fopen(thishost->loginmsg, "r"); 1620 #else 1621 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1622 #endif 1623 if (fd != NULL) { 1624 char *cp, line[LINE_MAX]; 1625 1626 while (fgets(line, sizeof(line), fd) != NULL) { 1627 if ((cp = strchr(line, '\n')) != NULL) 1628 *cp = '\0'; 1629 lreply(230, "%s", line); 1630 } 1631 (void) fflush(stdout); 1632 (void) fclose(fd); 1633 } 1634 if (guest) { 1635 if (ident != NULL) 1636 free(ident); 1637 ident = strdup(passwd); 1638 if (ident == NULL) 1639 fatalerror("Ran out of memory."); 1640 1641 reply(230, "Guest login ok, access restrictions apply."); 1642 #ifdef SETPROCTITLE 1643 #ifdef VIRTUAL_HOSTING 1644 if (thishost != firsthost) 1645 snprintf(proctitle, sizeof(proctitle), 1646 "%s: anonymous(%s)/%s", remotehost, hostname, 1647 passwd); 1648 else 1649 #endif 1650 snprintf(proctitle, sizeof(proctitle), 1651 "%s: anonymous/%s", remotehost, passwd); 1652 setproctitle("%s", proctitle); 1653 #endif /* SETPROCTITLE */ 1654 if (logging) 1655 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1656 remotehost, passwd); 1657 } else { 1658 if (dochroot) 1659 reply(230, "User %s logged in, " 1660 "access restrictions apply.", pw->pw_name); 1661 else 1662 reply(230, "User %s logged in.", pw->pw_name); 1663 1664 #ifdef SETPROCTITLE 1665 snprintf(proctitle, sizeof(proctitle), 1666 "%s: user/%s", remotehost, pw->pw_name); 1667 setproctitle("%s", proctitle); 1668 #endif /* SETPROCTITLE */ 1669 if (logging) 1670 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1671 remotehost, pw->pw_name); 1672 } 1673 if (logging && (guest || dochroot)) 1674 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1675 #ifdef LOGIN_CAP 1676 login_close(lc); 1677 #endif 1678 if (residue) 1679 free(residue); 1680 return; 1681 bad: 1682 /* Forget all about it... */ 1683 #ifdef LOGIN_CAP 1684 login_close(lc); 1685 #endif 1686 if (residue) 1687 free(residue); 1688 end_login(); 1689 } 1690 1691 void 1692 retrieve(char *cmd, char *name) 1693 { 1694 FILE *fin, *dout; 1695 struct stat st; 1696 int (*closefunc)(FILE *); 1697 time_t start; 1698 char line[BUFSIZ]; 1699 1700 if (cmd == 0) { 1701 fin = fopen(name, "r"), closefunc = fclose; 1702 st.st_size = 0; 1703 } else { 1704 (void) snprintf(line, sizeof(line), cmd, name); 1705 name = line; 1706 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1707 st.st_size = -1; 1708 st.st_blksize = BUFSIZ; 1709 } 1710 if (fin == NULL) { 1711 if (errno != 0) { 1712 perror_reply(550, name); 1713 if (cmd == 0) { 1714 LOGCMD("get", name); 1715 } 1716 } 1717 return; 1718 } 1719 byte_count = -1; 1720 if (cmd == 0) { 1721 if (fstat(fileno(fin), &st) < 0) { 1722 perror_reply(550, name); 1723 goto done; 1724 } 1725 if (!S_ISREG(st.st_mode)) { 1726 /* 1727 * Never sending a raw directory is a workaround 1728 * for buggy clients that will attempt to RETR 1729 * a directory before listing it, e.g., Mozilla. 1730 * Preventing a guest from getting irregular files 1731 * is a simple security measure. 1732 */ 1733 if (S_ISDIR(st.st_mode) || guest) { 1734 reply(550, "%s: not a plain file.", name); 1735 goto done; 1736 } 1737 st.st_size = -1; 1738 /* st.st_blksize is set for all descriptor types */ 1739 } 1740 } 1741 if (restart_point) { 1742 if (type == TYPE_A) { 1743 off_t i, n; 1744 int c; 1745 1746 n = restart_point; 1747 i = 0; 1748 while (i++ < n) { 1749 if ((c=getc(fin)) == EOF) { 1750 perror_reply(550, name); 1751 goto done; 1752 } 1753 if (c == '\n') 1754 i++; 1755 } 1756 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1757 perror_reply(550, name); 1758 goto done; 1759 } 1760 } 1761 dout = dataconn(name, st.st_size, "w"); 1762 if (dout == NULL) 1763 goto done; 1764 time(&start); 1765 send_data(fin, dout, st.st_blksize, st.st_size, 1766 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1767 if (cmd == 0 && guest && stats && byte_count > 0) 1768 logxfer(name, byte_count, start); 1769 (void) fclose(dout); 1770 data = -1; 1771 pdata = -1; 1772 done: 1773 if (cmd == 0) 1774 LOGBYTES("get", name, byte_count); 1775 (*closefunc)(fin); 1776 } 1777 1778 void 1779 store(char *name, char *mode, int unique) 1780 { 1781 int fd; 1782 FILE *fout, *din; 1783 int (*closefunc)(FILE *); 1784 1785 if (*mode == 'a') { /* APPE */ 1786 if (unique) { 1787 /* Programming error */ 1788 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1789 unique = 0; 1790 } 1791 if (guest && noguestmod) { 1792 reply(550, "Appending to existing file denied."); 1793 goto err; 1794 } 1795 restart_point = 0; /* not affected by preceding REST */ 1796 } 1797 if (unique) /* STOU overrides REST */ 1798 restart_point = 0; 1799 if (guest && noguestmod) { 1800 if (restart_point) { /* guest STOR w/REST */ 1801 reply(550, "Modifying existing file denied."); 1802 goto err; 1803 } else /* treat guest STOR as STOU */ 1804 unique = 1; 1805 } 1806 1807 if (restart_point) 1808 mode = "r+"; /* so ASCII manual seek can work */ 1809 if (unique) { 1810 if ((fd = guniquefd(name, &name)) < 0) 1811 goto err; 1812 fout = fdopen(fd, mode); 1813 } else 1814 fout = fopen(name, mode); 1815 closefunc = fclose; 1816 if (fout == NULL) { 1817 perror_reply(553, name); 1818 goto err; 1819 } 1820 byte_count = -1; 1821 if (restart_point) { 1822 if (type == TYPE_A) { 1823 off_t i, n; 1824 int c; 1825 1826 n = restart_point; 1827 i = 0; 1828 while (i++ < n) { 1829 if ((c=getc(fout)) == EOF) { 1830 perror_reply(550, name); 1831 goto done; 1832 } 1833 if (c == '\n') 1834 i++; 1835 } 1836 /* 1837 * We must do this seek to "current" position 1838 * because we are changing from reading to 1839 * writing. 1840 */ 1841 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1842 perror_reply(550, name); 1843 goto done; 1844 } 1845 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1846 perror_reply(550, name); 1847 goto done; 1848 } 1849 } 1850 din = dataconn(name, -1, "r"); 1851 if (din == NULL) 1852 goto done; 1853 if (receive_data(din, fout) == 0) { 1854 if (unique) 1855 reply(226, "Transfer complete (unique file name:%s).", 1856 name); 1857 else 1858 reply(226, "Transfer complete."); 1859 } 1860 (void) fclose(din); 1861 data = -1; 1862 pdata = -1; 1863 done: 1864 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1865 (*closefunc)(fout); 1866 return; 1867 err: 1868 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1869 return; 1870 } 1871 1872 static FILE * 1873 getdatasock(char *mode) 1874 { 1875 int on = 1, s, t, tries; 1876 1877 if (data >= 0) 1878 return (fdopen(data, mode)); 1879 1880 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1881 if (s < 0) 1882 goto bad; 1883 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1884 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1885 /* anchor socket to avoid multi-homing problems */ 1886 data_source = ctrl_addr; 1887 data_source.su_port = htons(dataport); 1888 (void) seteuid(0); 1889 for (tries = 1; ; tries++) { 1890 /* 1891 * We should loop here since it's possible that 1892 * another ftpd instance has passed this point and is 1893 * trying to open a data connection in active mode now. 1894 * Until the other connection is opened, we'll be getting 1895 * EADDRINUSE because no SOCK_STREAM sockets in the system 1896 * can share both local and remote addresses, localIP:20 1897 * and *:* in this case. 1898 */ 1899 if (bind(s, (struct sockaddr *)&data_source, 1900 data_source.su_len) >= 0) 1901 break; 1902 if (errno != EADDRINUSE || tries > 10) 1903 goto bad; 1904 sleep(tries); 1905 } 1906 (void) seteuid(pw->pw_uid); 1907 #ifdef IP_TOS 1908 if (data_source.su_family == AF_INET) 1909 { 1910 on = IPTOS_THROUGHPUT; 1911 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1912 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1913 } 1914 #endif 1915 #ifdef TCP_NOPUSH 1916 /* 1917 * Turn off push flag to keep sender TCP from sending short packets 1918 * at the boundaries of each write(). 1919 */ 1920 on = 1; 1921 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1922 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1923 #endif 1924 return (fdopen(s, mode)); 1925 bad: 1926 /* Return the real value of errno (close may change it) */ 1927 t = errno; 1928 (void) seteuid(pw->pw_uid); 1929 (void) close(s); 1930 errno = t; 1931 return (NULL); 1932 } 1933 1934 static FILE * 1935 dataconn(char *name, off_t size, char *mode) 1936 { 1937 char sizebuf[32]; 1938 FILE *file; 1939 int retry = 0, tos, conerrno; 1940 1941 file_size = size; 1942 byte_count = 0; 1943 if (size != -1) 1944 (void) snprintf(sizebuf, sizeof(sizebuf), 1945 " (%jd bytes)", (intmax_t)size); 1946 else 1947 *sizebuf = '\0'; 1948 if (pdata >= 0) { 1949 union sockunion from; 1950 socklen_t fromlen = ctrl_addr.su_len; 1951 int flags, s; 1952 struct timeval timeout; 1953 fd_set set; 1954 1955 FD_ZERO(&set); 1956 FD_SET(pdata, &set); 1957 1958 timeout.tv_usec = 0; 1959 timeout.tv_sec = 120; 1960 1961 /* 1962 * Granted a socket is in the blocking I/O mode, 1963 * accept() will block after a successful select() 1964 * if the selected connection dies in between. 1965 * Therefore set the non-blocking I/O flag here. 1966 */ 1967 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1968 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1969 goto pdata_err; 1970 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1971 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1972 goto pdata_err; 1973 (void) close(pdata); 1974 pdata = s; 1975 /* 1976 * Unset the inherited non-blocking I/O flag 1977 * on the child socket so stdio can work on it. 1978 */ 1979 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1980 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1981 goto pdata_err; 1982 #ifdef IP_TOS 1983 if (from.su_family == AF_INET) 1984 { 1985 tos = IPTOS_THROUGHPUT; 1986 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1987 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1988 } 1989 #endif 1990 reply(150, "Opening %s mode data connection for '%s'%s.", 1991 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1992 return (fdopen(pdata, mode)); 1993 pdata_err: 1994 reply(425, "Can't open data connection."); 1995 (void) close(pdata); 1996 pdata = -1; 1997 return (NULL); 1998 } 1999 if (data >= 0) { 2000 reply(125, "Using existing data connection for '%s'%s.", 2001 name, sizebuf); 2002 usedefault = 1; 2003 return (fdopen(data, mode)); 2004 } 2005 if (usedefault) 2006 data_dest = his_addr; 2007 usedefault = 1; 2008 do { 2009 file = getdatasock(mode); 2010 if (file == NULL) { 2011 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 2012 2013 if (getnameinfo((struct sockaddr *)&data_source, 2014 data_source.su_len, 2015 hostbuf, sizeof(hostbuf) - 1, 2016 portbuf, sizeof(portbuf) - 1, 2017 NI_NUMERICHOST|NI_NUMERICSERV)) 2018 *hostbuf = *portbuf = 0; 2019 hostbuf[sizeof(hostbuf) - 1] = 0; 2020 portbuf[sizeof(portbuf) - 1] = 0; 2021 reply(425, "Can't create data socket (%s,%s): %s.", 2022 hostbuf, portbuf, strerror(errno)); 2023 return (NULL); 2024 } 2025 data = fileno(file); 2026 conerrno = 0; 2027 if (connect(data, (struct sockaddr *)&data_dest, 2028 data_dest.su_len) == 0) 2029 break; 2030 conerrno = errno; 2031 (void) fclose(file); 2032 data = -1; 2033 if (conerrno == EADDRINUSE) { 2034 sleep(swaitint); 2035 retry += swaitint; 2036 } else { 2037 break; 2038 } 2039 } while (retry <= swaitmax); 2040 if (conerrno != 0) { 2041 reply(425, "Can't build data connection: %s.", 2042 strerror(conerrno)); 2043 return (NULL); 2044 } 2045 reply(150, "Opening %s mode data connection for '%s'%s.", 2046 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2047 return (file); 2048 } 2049 2050 /* 2051 * A helper macro to avoid code duplication 2052 * in send_data() and receive_data(). 2053 * 2054 * XXX We have to block SIGURG during putc() because BSD stdio 2055 * is unable to restart interrupted write operations and hence 2056 * the entire buffer contents will be lost as soon as a write() 2057 * call indicates EINTR to stdio. 2058 */ 2059 #define FTPD_PUTC(ch, file, label) \ 2060 do { \ 2061 int ret; \ 2062 \ 2063 do { \ 2064 START_UNSAFE; \ 2065 ret = putc((ch), (file)); \ 2066 END_UNSAFE; \ 2067 CHECKOOB(return (-1)) \ 2068 else if (ferror(file)) \ 2069 goto label; \ 2070 clearerr(file); \ 2071 } while (ret == EOF); \ 2072 } while (0) 2073 2074 /* 2075 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2076 * encapsulation of the data subject to Mode, Structure, and Type. 2077 * 2078 * NB: Form isn't handled. 2079 */ 2080 static int 2081 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2082 { 2083 int c, cp, filefd, netfd; 2084 char *buf; 2085 2086 STARTXFER; 2087 2088 switch (type) { 2089 2090 case TYPE_A: 2091 cp = EOF; 2092 for (;;) { 2093 c = getc(instr); 2094 CHECKOOB(return (-1)) 2095 else if (c == EOF && ferror(instr)) 2096 goto file_err; 2097 if (c == EOF) { 2098 if (ferror(instr)) { /* resume after OOB */ 2099 clearerr(instr); 2100 continue; 2101 } 2102 if (feof(instr)) /* EOF */ 2103 break; 2104 syslog(LOG_ERR, "Internal: impossible condition" 2105 " on file after getc()"); 2106 goto file_err; 2107 } 2108 if (c == '\n' && cp != '\r') { 2109 FTPD_PUTC('\r', outstr, data_err); 2110 byte_count++; 2111 } 2112 FTPD_PUTC(c, outstr, data_err); 2113 byte_count++; 2114 cp = c; 2115 } 2116 #ifdef notyet /* BSD stdio isn't ready for that */ 2117 while (fflush(outstr) == EOF) { 2118 CHECKOOB(return (-1)) 2119 else 2120 goto data_err; 2121 clearerr(outstr); 2122 } 2123 ENDXFER; 2124 #else 2125 ENDXFER; 2126 if (fflush(outstr) == EOF) 2127 goto data_err; 2128 #endif 2129 reply(226, "Transfer complete."); 2130 return (0); 2131 2132 case TYPE_I: 2133 case TYPE_L: 2134 /* 2135 * isreg is only set if we are not doing restart and we 2136 * are sending a regular file 2137 */ 2138 netfd = fileno(outstr); 2139 filefd = fileno(instr); 2140 2141 if (isreg) { 2142 char *msg = "Transfer complete."; 2143 off_t cnt, offset; 2144 int err; 2145 2146 cnt = offset = 0; 2147 2148 while (filesize > 0) { 2149 err = sendfile(filefd, netfd, offset, 0, 2150 NULL, &cnt, 0); 2151 /* 2152 * Calculate byte_count before OOB processing. 2153 * It can be used in myoob() later. 2154 */ 2155 byte_count += cnt; 2156 offset += cnt; 2157 filesize -= cnt; 2158 CHECKOOB(return (-1)) 2159 else if (err == -1) { 2160 if (errno != EINTR && 2161 cnt == 0 && offset == 0) 2162 goto oldway; 2163 goto data_err; 2164 } 2165 if (err == -1) /* resume after OOB */ 2166 continue; 2167 /* 2168 * We hit the EOF prematurely. 2169 * Perhaps the file was externally truncated. 2170 */ 2171 if (cnt == 0) { 2172 msg = "Transfer finished due to " 2173 "premature end of file."; 2174 break; 2175 } 2176 } 2177 ENDXFER; 2178 reply(226, "%s", msg); 2179 return (0); 2180 } 2181 2182 oldway: 2183 if ((buf = malloc(blksize)) == NULL) { 2184 ENDXFER; 2185 reply(451, "Ran out of memory."); 2186 return (-1); 2187 } 2188 2189 for (;;) { 2190 int cnt, len; 2191 char *bp; 2192 2193 cnt = read(filefd, buf, blksize); 2194 CHECKOOB(free(buf); return (-1)) 2195 else if (cnt < 0) { 2196 free(buf); 2197 goto file_err; 2198 } 2199 if (cnt < 0) /* resume after OOB */ 2200 continue; 2201 if (cnt == 0) /* EOF */ 2202 break; 2203 for (len = cnt, bp = buf; len > 0;) { 2204 cnt = write(netfd, bp, len); 2205 CHECKOOB(free(buf); return (-1)) 2206 else if (cnt < 0) { 2207 free(buf); 2208 goto data_err; 2209 } 2210 if (cnt <= 0) 2211 continue; 2212 len -= cnt; 2213 bp += cnt; 2214 byte_count += cnt; 2215 } 2216 } 2217 ENDXFER; 2218 free(buf); 2219 reply(226, "Transfer complete."); 2220 return (0); 2221 default: 2222 ENDXFER; 2223 reply(550, "Unimplemented TYPE %d in send_data.", type); 2224 return (-1); 2225 } 2226 2227 data_err: 2228 ENDXFER; 2229 perror_reply(426, "Data connection"); 2230 return (-1); 2231 2232 file_err: 2233 ENDXFER; 2234 perror_reply(551, "Error on input file"); 2235 return (-1); 2236 } 2237 2238 /* 2239 * Transfer data from peer to "outstr" using the appropriate encapulation of 2240 * the data subject to Mode, Structure, and Type. 2241 * 2242 * N.B.: Form isn't handled. 2243 */ 2244 static int 2245 receive_data(FILE *instr, FILE *outstr) 2246 { 2247 int c, cp; 2248 int bare_lfs = 0; 2249 2250 STARTXFER; 2251 2252 switch (type) { 2253 2254 case TYPE_I: 2255 case TYPE_L: 2256 for (;;) { 2257 int cnt, len; 2258 char *bp; 2259 char buf[BUFSIZ]; 2260 2261 cnt = read(fileno(instr), buf, sizeof(buf)); 2262 CHECKOOB(return (-1)) 2263 else if (cnt < 0) 2264 goto data_err; 2265 if (cnt < 0) /* resume after OOB */ 2266 continue; 2267 if (cnt == 0) /* EOF */ 2268 break; 2269 for (len = cnt, bp = buf; len > 0;) { 2270 cnt = write(fileno(outstr), bp, len); 2271 CHECKOOB(return (-1)) 2272 else if (cnt < 0) 2273 goto file_err; 2274 if (cnt <= 0) 2275 continue; 2276 len -= cnt; 2277 bp += cnt; 2278 byte_count += cnt; 2279 } 2280 } 2281 ENDXFER; 2282 return (0); 2283 2284 case TYPE_E: 2285 ENDXFER; 2286 reply(553, "TYPE E not implemented."); 2287 return (-1); 2288 2289 case TYPE_A: 2290 cp = EOF; 2291 for (;;) { 2292 c = getc(instr); 2293 CHECKOOB(return (-1)) 2294 else if (c == EOF && ferror(instr)) 2295 goto data_err; 2296 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2297 clearerr(instr); 2298 continue; 2299 } 2300 2301 if (cp == '\r') { 2302 if (c != '\n') 2303 FTPD_PUTC('\r', outstr, file_err); 2304 } else 2305 if (c == '\n') 2306 bare_lfs++; 2307 if (c == '\r') { 2308 byte_count++; 2309 cp = c; 2310 continue; 2311 } 2312 2313 /* Check for EOF here in order not to lose last \r. */ 2314 if (c == EOF) { 2315 if (feof(instr)) /* EOF */ 2316 break; 2317 syslog(LOG_ERR, "Internal: impossible condition" 2318 " on data stream after getc()"); 2319 goto data_err; 2320 } 2321 2322 byte_count++; 2323 FTPD_PUTC(c, outstr, file_err); 2324 cp = c; 2325 } 2326 #ifdef notyet /* BSD stdio isn't ready for that */ 2327 while (fflush(outstr) == EOF) { 2328 CHECKOOB(return (-1)) 2329 else 2330 goto file_err; 2331 clearerr(outstr); 2332 } 2333 ENDXFER; 2334 #else 2335 ENDXFER; 2336 if (fflush(outstr) == EOF) 2337 goto file_err; 2338 #endif 2339 if (bare_lfs) { 2340 lreply(226, 2341 "WARNING! %d bare linefeeds received in ASCII mode.", 2342 bare_lfs); 2343 (void)printf(" File may not have transferred correctly.\r\n"); 2344 } 2345 return (0); 2346 default: 2347 ENDXFER; 2348 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2349 return (-1); 2350 } 2351 2352 data_err: 2353 ENDXFER; 2354 perror_reply(426, "Data connection"); 2355 return (-1); 2356 2357 file_err: 2358 ENDXFER; 2359 perror_reply(452, "Error writing to file"); 2360 return (-1); 2361 } 2362 2363 void 2364 statfilecmd(char *filename) 2365 { 2366 FILE *fin; 2367 int atstart; 2368 int c, code; 2369 char line[LINE_MAX]; 2370 struct stat st; 2371 2372 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2373 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2374 fin = ftpd_popen(line, "r"); 2375 if (fin == NULL) { 2376 perror_reply(551, filename); 2377 return; 2378 } 2379 lreply(code, "Status of %s:", filename); 2380 atstart = 1; 2381 while ((c = getc(fin)) != EOF) { 2382 if (c == '\n') { 2383 if (ferror(stdout)){ 2384 perror_reply(421, "Control connection"); 2385 (void) ftpd_pclose(fin); 2386 dologout(1); 2387 /* NOTREACHED */ 2388 } 2389 if (ferror(fin)) { 2390 perror_reply(551, filename); 2391 (void) ftpd_pclose(fin); 2392 return; 2393 } 2394 (void) putc('\r', stdout); 2395 } 2396 /* 2397 * RFC 959 says neutral text should be prepended before 2398 * a leading 3-digit number followed by whitespace, but 2399 * many ftp clients can be confused by any leading digits, 2400 * as a matter of fact. 2401 */ 2402 if (atstart && isdigit(c)) 2403 (void) putc(' ', stdout); 2404 (void) putc(c, stdout); 2405 atstart = (c == '\n'); 2406 } 2407 (void) ftpd_pclose(fin); 2408 reply(code, "End of status."); 2409 } 2410 2411 void 2412 statcmd(void) 2413 { 2414 union sockunion *su; 2415 u_char *a, *p; 2416 char hname[NI_MAXHOST]; 2417 int ispassive; 2418 2419 if (hostinfo) { 2420 lreply(211, "%s FTP server status:", hostname); 2421 printf(" %s\r\n", version); 2422 } else 2423 lreply(211, "FTP server status:"); 2424 printf(" Connected to %s", remotehost); 2425 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2426 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2427 hname[sizeof(hname) - 1] = 0; 2428 if (strcmp(hname, remotehost) != 0) 2429 printf(" (%s)", hname); 2430 } 2431 printf("\r\n"); 2432 if (logged_in) { 2433 if (guest) 2434 printf(" Logged in anonymously\r\n"); 2435 else 2436 printf(" Logged in as %s\r\n", pw->pw_name); 2437 } else if (askpasswd) 2438 printf(" Waiting for password\r\n"); 2439 else 2440 printf(" Waiting for user name\r\n"); 2441 printf(" TYPE: %s", typenames[type]); 2442 if (type == TYPE_A || type == TYPE_E) 2443 printf(", FORM: %s", formnames[form]); 2444 if (type == TYPE_L) 2445 #if CHAR_BIT == 8 2446 printf(" %d", CHAR_BIT); 2447 #else 2448 printf(" %d", bytesize); /* need definition! */ 2449 #endif 2450 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2451 strunames[stru], modenames[mode]); 2452 if (data != -1) 2453 printf(" Data connection open\r\n"); 2454 else if (pdata != -1) { 2455 ispassive = 1; 2456 su = &pasv_addr; 2457 goto printaddr; 2458 } else if (usedefault == 0) { 2459 ispassive = 0; 2460 su = &data_dest; 2461 printaddr: 2462 #define UC(b) (((int) b) & 0xff) 2463 if (epsvall) { 2464 printf(" EPSV only mode (EPSV ALL)\r\n"); 2465 goto epsvonly; 2466 } 2467 2468 /* PORT/PASV */ 2469 if (su->su_family == AF_INET) { 2470 a = (u_char *) &su->su_sin.sin_addr; 2471 p = (u_char *) &su->su_sin.sin_port; 2472 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2473 ispassive ? "PASV" : "PORT", 2474 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2475 UC(p[0]), UC(p[1])); 2476 } 2477 2478 /* LPRT/LPSV */ 2479 { 2480 int alen, af, i; 2481 2482 switch (su->su_family) { 2483 case AF_INET: 2484 a = (u_char *) &su->su_sin.sin_addr; 2485 p = (u_char *) &su->su_sin.sin_port; 2486 alen = sizeof(su->su_sin.sin_addr); 2487 af = 4; 2488 break; 2489 case AF_INET6: 2490 a = (u_char *) &su->su_sin6.sin6_addr; 2491 p = (u_char *) &su->su_sin6.sin6_port; 2492 alen = sizeof(su->su_sin6.sin6_addr); 2493 af = 6; 2494 break; 2495 default: 2496 af = 0; 2497 break; 2498 } 2499 if (af) { 2500 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2501 af, alen); 2502 for (i = 0; i < alen; i++) 2503 printf("%d,", UC(a[i])); 2504 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2505 } 2506 } 2507 2508 epsvonly:; 2509 /* EPRT/EPSV */ 2510 { 2511 int af; 2512 2513 switch (su->su_family) { 2514 case AF_INET: 2515 af = 1; 2516 break; 2517 case AF_INET6: 2518 af = 2; 2519 break; 2520 default: 2521 af = 0; 2522 break; 2523 } 2524 if (af) { 2525 union sockunion tmp; 2526 2527 tmp = *su; 2528 if (tmp.su_family == AF_INET6) 2529 tmp.su_sin6.sin6_scope_id = 0; 2530 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2531 hname, sizeof(hname) - 1, NULL, 0, 2532 NI_NUMERICHOST)) { 2533 hname[sizeof(hname) - 1] = 0; 2534 printf(" %s |%d|%s|%d|\r\n", 2535 ispassive ? "EPSV" : "EPRT", 2536 af, hname, htons(tmp.su_port)); 2537 } 2538 } 2539 } 2540 #undef UC 2541 } else 2542 printf(" No data connection\r\n"); 2543 reply(211, "End of status."); 2544 } 2545 2546 void 2547 fatalerror(char *s) 2548 { 2549 2550 reply(451, "Error in server: %s", s); 2551 reply(221, "Closing connection due to server error."); 2552 dologout(0); 2553 /* NOTREACHED */ 2554 } 2555 2556 void 2557 reply(int n, const char *fmt, ...) 2558 { 2559 va_list ap; 2560 2561 (void)printf("%d ", n); 2562 va_start(ap, fmt); 2563 (void)vprintf(fmt, ap); 2564 va_end(ap); 2565 (void)printf("\r\n"); 2566 (void)fflush(stdout); 2567 if (ftpdebug) { 2568 syslog(LOG_DEBUG, "<--- %d ", n); 2569 va_start(ap, fmt); 2570 vsyslog(LOG_DEBUG, fmt, ap); 2571 va_end(ap); 2572 } 2573 } 2574 2575 void 2576 lreply(int n, const char *fmt, ...) 2577 { 2578 va_list ap; 2579 2580 (void)printf("%d- ", n); 2581 va_start(ap, fmt); 2582 (void)vprintf(fmt, ap); 2583 va_end(ap); 2584 (void)printf("\r\n"); 2585 (void)fflush(stdout); 2586 if (ftpdebug) { 2587 syslog(LOG_DEBUG, "<--- %d- ", n); 2588 va_start(ap, fmt); 2589 vsyslog(LOG_DEBUG, fmt, ap); 2590 va_end(ap); 2591 } 2592 } 2593 2594 static void 2595 ack(char *s) 2596 { 2597 2598 reply(250, "%s command successful.", s); 2599 } 2600 2601 void 2602 nack(char *s) 2603 { 2604 2605 reply(502, "%s command not implemented.", s); 2606 } 2607 2608 /* ARGSUSED */ 2609 void 2610 yyerror(char *s) 2611 { 2612 char *cp; 2613 2614 if ((cp = strchr(cbuf,'\n'))) 2615 *cp = '\0'; 2616 reply(500, "%s: command not understood.", cbuf); 2617 } 2618 2619 void 2620 delete(char *name) 2621 { 2622 struct stat st; 2623 2624 LOGCMD("delete", name); 2625 if (lstat(name, &st) < 0) { 2626 perror_reply(550, name); 2627 return; 2628 } 2629 if (S_ISDIR(st.st_mode)) { 2630 if (rmdir(name) < 0) { 2631 perror_reply(550, name); 2632 return; 2633 } 2634 goto done; 2635 } 2636 if (guest && noguestmod) { 2637 reply(550, "Operation not permitted."); 2638 return; 2639 } 2640 if (unlink(name) < 0) { 2641 perror_reply(550, name); 2642 return; 2643 } 2644 done: 2645 ack("DELE"); 2646 } 2647 2648 void 2649 cwd(char *path) 2650 { 2651 2652 if (chdir(path) < 0) 2653 perror_reply(550, path); 2654 else 2655 ack("CWD"); 2656 } 2657 2658 void 2659 makedir(char *name) 2660 { 2661 char *s; 2662 2663 LOGCMD("mkdir", name); 2664 if (guest && noguestmkd) 2665 reply(550, "Operation not permitted."); 2666 else if (mkdir(name, 0777) < 0) 2667 perror_reply(550, name); 2668 else { 2669 if ((s = doublequote(name)) == NULL) 2670 fatalerror("Ran out of memory."); 2671 reply(257, "\"%s\" directory created.", s); 2672 free(s); 2673 } 2674 } 2675 2676 void 2677 removedir(char *name) 2678 { 2679 2680 LOGCMD("rmdir", name); 2681 if (rmdir(name) < 0) 2682 perror_reply(550, name); 2683 else 2684 ack("RMD"); 2685 } 2686 2687 void 2688 pwd(void) 2689 { 2690 char *s, path[MAXPATHLEN + 1]; 2691 2692 if (getcwd(path, sizeof(path)) == NULL) 2693 perror_reply(550, "Get current directory"); 2694 else { 2695 if ((s = doublequote(path)) == NULL) 2696 fatalerror("Ran out of memory."); 2697 reply(257, "\"%s\" is current directory.", s); 2698 free(s); 2699 } 2700 } 2701 2702 char * 2703 renamefrom(char *name) 2704 { 2705 struct stat st; 2706 2707 if (guest && noguestmod) { 2708 reply(550, "Operation not permitted."); 2709 return (NULL); 2710 } 2711 if (lstat(name, &st) < 0) { 2712 perror_reply(550, name); 2713 return (NULL); 2714 } 2715 reply(350, "File exists, ready for destination name."); 2716 return (name); 2717 } 2718 2719 void 2720 renamecmd(char *from, char *to) 2721 { 2722 struct stat st; 2723 2724 LOGCMD2("rename", from, to); 2725 2726 if (guest && (stat(to, &st) == 0)) { 2727 reply(550, "%s: permission denied.", to); 2728 return; 2729 } 2730 2731 if (rename(from, to) < 0) 2732 perror_reply(550, "rename"); 2733 else 2734 ack("RNTO"); 2735 } 2736 2737 static void 2738 dolog(struct sockaddr *who) 2739 { 2740 char who_name[NI_MAXHOST]; 2741 2742 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2743 remotehost[sizeof(remotehost) - 1] = 0; 2744 if (getnameinfo(who, who->sa_len, 2745 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2746 *who_name = 0; 2747 who_name[sizeof(who_name) - 1] = 0; 2748 2749 #ifdef SETPROCTITLE 2750 #ifdef VIRTUAL_HOSTING 2751 if (thishost != firsthost) 2752 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2753 remotehost, hostname); 2754 else 2755 #endif 2756 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2757 remotehost); 2758 setproctitle("%s", proctitle); 2759 #endif /* SETPROCTITLE */ 2760 2761 if (logging) { 2762 #ifdef VIRTUAL_HOSTING 2763 if (thishost != firsthost) 2764 syslog(LOG_INFO, "connection from %s (%s) to %s", 2765 remotehost, who_name, hostname); 2766 else 2767 #endif 2768 syslog(LOG_INFO, "connection from %s (%s)", 2769 remotehost, who_name); 2770 } 2771 } 2772 2773 /* 2774 * Record logout in wtmp file 2775 * and exit with supplied status. 2776 */ 2777 void 2778 dologout(int status) 2779 { 2780 2781 if (logged_in && dowtmp) { 2782 (void) seteuid(0); 2783 #ifdef LOGIN_CAP 2784 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 2785 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 2786 LOGIN_SETENV)); 2787 #endif 2788 ftpd_logwtmp(wtmpid, NULL, NULL); 2789 } 2790 /* beware of flushing buffers after a SIGPIPE */ 2791 _exit(status); 2792 } 2793 2794 static void 2795 sigurg(int signo) 2796 { 2797 2798 recvurg = 1; 2799 } 2800 2801 static void 2802 maskurg(int flag) 2803 { 2804 int oerrno; 2805 sigset_t sset; 2806 2807 if (!transflag) { 2808 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2809 return; 2810 } 2811 oerrno = errno; 2812 sigemptyset(&sset); 2813 sigaddset(&sset, SIGURG); 2814 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2815 errno = oerrno; 2816 } 2817 2818 static void 2819 flagxfer(int flag) 2820 { 2821 2822 if (flag) { 2823 if (transflag) 2824 syslog(LOG_ERR, "Internal: flagxfer(1): " 2825 "transfer already under way"); 2826 transflag = 1; 2827 maskurg(0); 2828 recvurg = 0; 2829 } else { 2830 if (!transflag) 2831 syslog(LOG_ERR, "Internal: flagxfer(0): " 2832 "no active transfer"); 2833 maskurg(1); 2834 transflag = 0; 2835 } 2836 } 2837 2838 /* 2839 * Returns 0 if OK to resume or -1 if abort requested. 2840 */ 2841 static int 2842 myoob(void) 2843 { 2844 char *cp; 2845 int ret; 2846 2847 if (!transflag) { 2848 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2849 return (0); 2850 } 2851 cp = tmpline; 2852 ret = get_line(cp, 7, stdin); 2853 if (ret == -1) { 2854 reply(221, "You could at least say goodbye."); 2855 dologout(0); 2856 } else if (ret == -2) { 2857 /* Ignore truncated command. */ 2858 return (0); 2859 } 2860 upper(cp); 2861 if (strcmp(cp, "ABOR\r\n") == 0) { 2862 tmpline[0] = '\0'; 2863 reply(426, "Transfer aborted. Data connection closed."); 2864 reply(226, "Abort successful."); 2865 return (-1); 2866 } 2867 if (strcmp(cp, "STAT\r\n") == 0) { 2868 tmpline[0] = '\0'; 2869 if (file_size != -1) 2870 reply(213, "Status: %jd of %jd bytes transferred.", 2871 (intmax_t)byte_count, (intmax_t)file_size); 2872 else 2873 reply(213, "Status: %jd bytes transferred.", 2874 (intmax_t)byte_count); 2875 } 2876 return (0); 2877 } 2878 2879 /* 2880 * Note: a response of 425 is not mentioned as a possible response to 2881 * the PASV command in RFC959. However, it has been blessed as 2882 * a legitimate response by Jon Postel in a telephone conversation 2883 * with Rick Adams on 25 Jan 89. 2884 */ 2885 void 2886 passive(void) 2887 { 2888 socklen_t len; 2889 int on; 2890 char *p, *a; 2891 2892 if (pdata >= 0) /* close old port if one set */ 2893 close(pdata); 2894 2895 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2896 if (pdata < 0) { 2897 perror_reply(425, "Can't open passive connection"); 2898 return; 2899 } 2900 on = 1; 2901 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2902 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2903 2904 (void) seteuid(0); 2905 2906 #ifdef IP_PORTRANGE 2907 if (ctrl_addr.su_family == AF_INET) { 2908 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2909 : IP_PORTRANGE_DEFAULT; 2910 2911 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2912 &on, sizeof(on)) < 0) 2913 goto pasv_error; 2914 } 2915 #endif 2916 #ifdef IPV6_PORTRANGE 2917 if (ctrl_addr.su_family == AF_INET6) { 2918 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2919 : IPV6_PORTRANGE_DEFAULT; 2920 2921 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2922 &on, sizeof(on)) < 0) 2923 goto pasv_error; 2924 } 2925 #endif 2926 2927 pasv_addr = ctrl_addr; 2928 pasv_addr.su_port = 0; 2929 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2930 goto pasv_error; 2931 2932 (void) seteuid(pw->pw_uid); 2933 2934 len = sizeof(pasv_addr); 2935 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2936 goto pasv_error; 2937 if (listen(pdata, 1) < 0) 2938 goto pasv_error; 2939 if (pasv_addr.su_family == AF_INET) 2940 a = (char *) &pasv_addr.su_sin.sin_addr; 2941 else if (pasv_addr.su_family == AF_INET6 && 2942 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2943 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2944 else 2945 goto pasv_error; 2946 2947 p = (char *) &pasv_addr.su_port; 2948 2949 #define UC(b) (((int) b) & 0xff) 2950 2951 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2952 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2953 return; 2954 2955 pasv_error: 2956 (void) seteuid(pw->pw_uid); 2957 (void) close(pdata); 2958 pdata = -1; 2959 perror_reply(425, "Can't open passive connection"); 2960 return; 2961 } 2962 2963 /* 2964 * Long Passive defined in RFC 1639. 2965 * 228 Entering Long Passive Mode 2966 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2967 */ 2968 2969 void 2970 long_passive(char *cmd, int pf) 2971 { 2972 socklen_t len; 2973 int on; 2974 char *p, *a; 2975 2976 if (pdata >= 0) /* close old port if one set */ 2977 close(pdata); 2978 2979 if (pf != PF_UNSPEC) { 2980 if (ctrl_addr.su_family != pf) { 2981 switch (ctrl_addr.su_family) { 2982 case AF_INET: 2983 pf = 1; 2984 break; 2985 case AF_INET6: 2986 pf = 2; 2987 break; 2988 default: 2989 pf = 0; 2990 break; 2991 } 2992 /* 2993 * XXX 2994 * only EPRT/EPSV ready clients will understand this 2995 */ 2996 if (strcmp(cmd, "EPSV") == 0 && pf) { 2997 reply(522, "Network protocol mismatch, " 2998 "use (%d)", pf); 2999 } else 3000 reply(501, "Network protocol mismatch."); /*XXX*/ 3001 3002 return; 3003 } 3004 } 3005 3006 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 3007 if (pdata < 0) { 3008 perror_reply(425, "Can't open passive connection"); 3009 return; 3010 } 3011 on = 1; 3012 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 3013 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 3014 3015 (void) seteuid(0); 3016 3017 pasv_addr = ctrl_addr; 3018 pasv_addr.su_port = 0; 3019 len = pasv_addr.su_len; 3020 3021 #ifdef IP_PORTRANGE 3022 if (ctrl_addr.su_family == AF_INET) { 3023 on = restricted_data_ports ? IP_PORTRANGE_HIGH 3024 : IP_PORTRANGE_DEFAULT; 3025 3026 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 3027 &on, sizeof(on)) < 0) 3028 goto pasv_error; 3029 } 3030 #endif 3031 #ifdef IPV6_PORTRANGE 3032 if (ctrl_addr.su_family == AF_INET6) { 3033 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 3034 : IPV6_PORTRANGE_DEFAULT; 3035 3036 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 3037 &on, sizeof(on)) < 0) 3038 goto pasv_error; 3039 } 3040 #endif 3041 3042 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 3043 goto pasv_error; 3044 3045 (void) seteuid(pw->pw_uid); 3046 3047 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 3048 goto pasv_error; 3049 if (listen(pdata, 1) < 0) 3050 goto pasv_error; 3051 3052 #define UC(b) (((int) b) & 0xff) 3053 3054 if (strcmp(cmd, "LPSV") == 0) { 3055 p = (char *)&pasv_addr.su_port; 3056 switch (pasv_addr.su_family) { 3057 case AF_INET: 3058 a = (char *) &pasv_addr.su_sin.sin_addr; 3059 v4_reply: 3060 reply(228, 3061 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3062 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3063 2, UC(p[0]), UC(p[1])); 3064 return; 3065 case AF_INET6: 3066 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3067 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3068 goto v4_reply; 3069 } 3070 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3071 reply(228, 3072 "Entering Long Passive Mode " 3073 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3074 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3075 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3076 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3077 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3078 2, UC(p[0]), UC(p[1])); 3079 return; 3080 } 3081 } else if (strcmp(cmd, "EPSV") == 0) { 3082 switch (pasv_addr.su_family) { 3083 case AF_INET: 3084 case AF_INET6: 3085 reply(229, "Entering Extended Passive Mode (|||%d|)", 3086 ntohs(pasv_addr.su_port)); 3087 return; 3088 } 3089 } else { 3090 /* more proper error code? */ 3091 } 3092 3093 pasv_error: 3094 (void) seteuid(pw->pw_uid); 3095 (void) close(pdata); 3096 pdata = -1; 3097 perror_reply(425, "Can't open passive connection"); 3098 return; 3099 } 3100 3101 /* 3102 * Generate unique name for file with basename "local" 3103 * and open the file in order to avoid possible races. 3104 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3105 * Return descriptor to the file, set "name" to its name. 3106 * 3107 * Generates failure reply on error. 3108 */ 3109 static int 3110 guniquefd(char *local, char **name) 3111 { 3112 static char new[MAXPATHLEN]; 3113 struct stat st; 3114 char *cp; 3115 int count; 3116 int fd; 3117 3118 cp = strrchr(local, '/'); 3119 if (cp) 3120 *cp = '\0'; 3121 if (stat(cp ? local : ".", &st) < 0) { 3122 perror_reply(553, cp ? local : "."); 3123 return (-1); 3124 } 3125 if (cp) { 3126 /* 3127 * Let not overwrite dirname with counter suffix. 3128 * -4 is for /nn\0 3129 * In this extreme case dot won't be put in front of suffix. 3130 */ 3131 if (strlen(local) > sizeof(new) - 4) { 3132 reply(553, "Pathname too long."); 3133 return (-1); 3134 } 3135 *cp = '/'; 3136 } 3137 /* -4 is for the .nn<null> we put on the end below */ 3138 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3139 cp = new + strlen(new); 3140 /* 3141 * Don't generate dotfile unless requested explicitly. 3142 * This covers the case when basename gets truncated off 3143 * by buffer size. 3144 */ 3145 if (cp > new && cp[-1] != '/') 3146 *cp++ = '.'; 3147 for (count = 0; count < 100; count++) { 3148 /* At count 0 try unmodified name */ 3149 if (count) 3150 (void)sprintf(cp, "%d", count); 3151 if ((fd = open(count ? new : local, 3152 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3153 *name = count ? new : local; 3154 return (fd); 3155 } 3156 if (errno != EEXIST) { 3157 perror_reply(553, count ? new : local); 3158 return (-1); 3159 } 3160 } 3161 reply(452, "Unique file name cannot be created."); 3162 return (-1); 3163 } 3164 3165 /* 3166 * Format and send reply containing system error number. 3167 */ 3168 void 3169 perror_reply(int code, char *string) 3170 { 3171 3172 reply(code, "%s: %s.", string, strerror(errno)); 3173 } 3174 3175 static char *onefile[] = { 3176 "", 3177 0 3178 }; 3179 3180 void 3181 send_file_list(char *whichf) 3182 { 3183 struct stat st; 3184 DIR *dirp = NULL; 3185 struct dirent *dir; 3186 FILE *dout = NULL; 3187 char **dirlist, *dirname; 3188 int simple = 0; 3189 int freeglob = 0; 3190 glob_t gl; 3191 3192 if (strpbrk(whichf, "~{[*?") != NULL) { 3193 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3194 3195 memset(&gl, 0, sizeof(gl)); 3196 gl.gl_matchc = MAXGLOBARGS; 3197 flags |= GLOB_LIMIT; 3198 freeglob = 1; 3199 if (glob(whichf, flags, 0, &gl)) { 3200 reply(550, "No matching files found."); 3201 goto out; 3202 } else if (gl.gl_pathc == 0) { 3203 errno = ENOENT; 3204 perror_reply(550, whichf); 3205 goto out; 3206 } 3207 dirlist = gl.gl_pathv; 3208 } else { 3209 onefile[0] = whichf; 3210 dirlist = onefile; 3211 simple = 1; 3212 } 3213 3214 while ((dirname = *dirlist++)) { 3215 if (stat(dirname, &st) < 0) { 3216 /* 3217 * If user typed "ls -l", etc, and the client 3218 * used NLST, do what the user meant. 3219 */ 3220 if (dirname[0] == '-' && *dirlist == NULL && 3221 dout == NULL) 3222 retrieve(_PATH_LS " %s", dirname); 3223 else 3224 perror_reply(550, whichf); 3225 goto out; 3226 } 3227 3228 if (S_ISREG(st.st_mode)) { 3229 if (dout == NULL) { 3230 dout = dataconn("file list", -1, "w"); 3231 if (dout == NULL) 3232 goto out; 3233 STARTXFER; 3234 } 3235 START_UNSAFE; 3236 fprintf(dout, "%s%s\n", dirname, 3237 type == TYPE_A ? "\r" : ""); 3238 END_UNSAFE; 3239 if (ferror(dout)) 3240 goto data_err; 3241 byte_count += strlen(dirname) + 3242 (type == TYPE_A ? 2 : 1); 3243 CHECKOOB(goto abrt); 3244 continue; 3245 } else if (!S_ISDIR(st.st_mode)) 3246 continue; 3247 3248 if ((dirp = opendir(dirname)) == NULL) 3249 continue; 3250 3251 while ((dir = readdir(dirp)) != NULL) { 3252 char nbuf[MAXPATHLEN]; 3253 3254 CHECKOOB(goto abrt); 3255 3256 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3257 continue; 3258 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3259 dir->d_namlen == 2) 3260 continue; 3261 3262 snprintf(nbuf, sizeof(nbuf), 3263 "%s/%s", dirname, dir->d_name); 3264 3265 /* 3266 * We have to do a stat to insure it's 3267 * not a directory or special file. 3268 */ 3269 if (simple || (stat(nbuf, &st) == 0 && 3270 S_ISREG(st.st_mode))) { 3271 if (dout == NULL) { 3272 dout = dataconn("file list", -1, "w"); 3273 if (dout == NULL) 3274 goto out; 3275 STARTXFER; 3276 } 3277 START_UNSAFE; 3278 if (nbuf[0] == '.' && nbuf[1] == '/') 3279 fprintf(dout, "%s%s\n", &nbuf[2], 3280 type == TYPE_A ? "\r" : ""); 3281 else 3282 fprintf(dout, "%s%s\n", nbuf, 3283 type == TYPE_A ? "\r" : ""); 3284 END_UNSAFE; 3285 if (ferror(dout)) 3286 goto data_err; 3287 byte_count += strlen(nbuf) + 3288 (type == TYPE_A ? 2 : 1); 3289 CHECKOOB(goto abrt); 3290 } 3291 } 3292 (void) closedir(dirp); 3293 dirp = NULL; 3294 } 3295 3296 if (dout == NULL) 3297 reply(550, "No files found."); 3298 else if (ferror(dout)) 3299 data_err: perror_reply(550, "Data connection"); 3300 else 3301 reply(226, "Transfer complete."); 3302 out: 3303 if (dout) { 3304 ENDXFER; 3305 abrt: 3306 (void) fclose(dout); 3307 data = -1; 3308 pdata = -1; 3309 } 3310 if (dirp) 3311 (void) closedir(dirp); 3312 if (freeglob) { 3313 freeglob = 0; 3314 globfree(&gl); 3315 } 3316 } 3317 3318 void 3319 reapchild(int signo) 3320 { 3321 while (waitpid(-1, NULL, WNOHANG) > 0); 3322 } 3323 3324 #ifdef OLD_SETPROCTITLE 3325 /* 3326 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3327 * Warning, since this is usually started from inetd.conf, it often doesn't 3328 * have much of an environment or arglist to overwrite. 3329 */ 3330 void 3331 setproctitle(const char *fmt, ...) 3332 { 3333 int i; 3334 va_list ap; 3335 char *p, *bp, ch; 3336 char buf[LINE_MAX]; 3337 3338 va_start(ap, fmt); 3339 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3340 3341 /* make ps print our process name */ 3342 p = Argv[0]; 3343 *p++ = '-'; 3344 3345 i = strlen(buf); 3346 if (i > LastArgv - p - 2) { 3347 i = LastArgv - p - 2; 3348 buf[i] = '\0'; 3349 } 3350 bp = buf; 3351 while (ch = *bp++) 3352 if (ch != '\n' && ch != '\r') 3353 *p++ = ch; 3354 while (p < LastArgv) 3355 *p++ = ' '; 3356 } 3357 #endif /* OLD_SETPROCTITLE */ 3358 3359 static void 3360 appendf(char **strp, char *fmt, ...) 3361 { 3362 va_list ap; 3363 char *ostr, *p; 3364 3365 va_start(ap, fmt); 3366 vasprintf(&p, fmt, ap); 3367 va_end(ap); 3368 if (p == NULL) 3369 fatalerror("Ran out of memory."); 3370 if (*strp == NULL) 3371 *strp = p; 3372 else { 3373 ostr = *strp; 3374 asprintf(strp, "%s%s", ostr, p); 3375 if (*strp == NULL) 3376 fatalerror("Ran out of memory."); 3377 free(ostr); 3378 } 3379 } 3380 3381 static void 3382 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3383 { 3384 char *msg = NULL; 3385 char wd[MAXPATHLEN + 1]; 3386 3387 if (logging <= 1) 3388 return; 3389 3390 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3391 strcpy(wd, strerror(errno)); 3392 3393 appendf(&msg, "%s", cmd); 3394 if (file1) 3395 appendf(&msg, " %s", file1); 3396 if (file2) 3397 appendf(&msg, " %s", file2); 3398 if (cnt >= 0) 3399 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3400 appendf(&msg, " (wd: %s", wd); 3401 if (guest || dochroot) 3402 appendf(&msg, "; chrooted"); 3403 appendf(&msg, ")"); 3404 syslog(LOG_INFO, "%s", msg); 3405 free(msg); 3406 } 3407 3408 static void 3409 logxfer(char *name, off_t size, time_t start) 3410 { 3411 char buf[MAXPATHLEN + 1024]; 3412 char path[MAXPATHLEN + 1]; 3413 time_t now; 3414 3415 if (statfd >= 0) { 3416 time(&now); 3417 if (realpath(name, path) == NULL) { 3418 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3419 return; 3420 } 3421 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3422 ctime(&now)+4, ident, remotehost, 3423 path, (intmax_t)size, 3424 (long)(now - start + (now == start))); 3425 write(statfd, buf, strlen(buf)); 3426 } 3427 } 3428 3429 static char * 3430 doublequote(char *s) 3431 { 3432 int n; 3433 char *p, *s2; 3434 3435 for (p = s, n = 0; *p; p++) 3436 if (*p == '"') 3437 n++; 3438 3439 if ((s2 = malloc(p - s + n + 1)) == NULL) 3440 return (NULL); 3441 3442 for (p = s2; *s; s++, p++) { 3443 if ((*p = *s) == '"') 3444 *(++p) = '"'; 3445 } 3446 *p = '\0'; 3447 3448 return (s2); 3449 } 3450 3451 /* setup server socket for specified address family */ 3452 /* if af is PF_UNSPEC more than one socket may be returned */ 3453 /* the returned list is dynamically allocated, so caller needs to free it */ 3454 static int * 3455 socksetup(int af, char *bindname, const char *bindport) 3456 { 3457 struct addrinfo hints, *res, *r; 3458 int error, maxs, *s, *socks; 3459 const int on = 1; 3460 3461 memset(&hints, 0, sizeof(hints)); 3462 hints.ai_flags = AI_PASSIVE; 3463 hints.ai_family = af; 3464 hints.ai_socktype = SOCK_STREAM; 3465 error = getaddrinfo(bindname, bindport, &hints, &res); 3466 if (error) { 3467 syslog(LOG_ERR, "%s", gai_strerror(error)); 3468 if (error == EAI_SYSTEM) 3469 syslog(LOG_ERR, "%s", strerror(errno)); 3470 return NULL; 3471 } 3472 3473 /* Count max number of sockets we may open */ 3474 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3475 ; 3476 socks = malloc((maxs + 1) * sizeof(int)); 3477 if (!socks) { 3478 freeaddrinfo(res); 3479 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3480 return NULL; 3481 } 3482 3483 *socks = 0; /* num of sockets counter at start of array */ 3484 s = socks + 1; 3485 for (r = res; r; r = r->ai_next) { 3486 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3487 if (*s < 0) { 3488 syslog(LOG_DEBUG, "control socket: %m"); 3489 continue; 3490 } 3491 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3492 &on, sizeof(on)) < 0) 3493 syslog(LOG_WARNING, 3494 "control setsockopt (SO_REUSEADDR): %m"); 3495 if (r->ai_family == AF_INET6) { 3496 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3497 &on, sizeof(on)) < 0) 3498 syslog(LOG_WARNING, 3499 "control setsockopt (IPV6_V6ONLY): %m"); 3500 } 3501 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3502 syslog(LOG_DEBUG, "control bind: %m"); 3503 close(*s); 3504 continue; 3505 } 3506 (*socks)++; 3507 s++; 3508 } 3509 3510 if (res) 3511 freeaddrinfo(res); 3512 3513 if (*socks == 0) { 3514 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3515 free(socks); 3516 return NULL; 3517 } 3518 return(socks); 3519 } 3520