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