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