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