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