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 **); 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 char *cp, *shell; 1000 1001 if (logged_in) { 1002 if (guest) { 1003 reply(530, "Can't change user from guest login."); 1004 return; 1005 } else if (dochroot) { 1006 reply(530, "Can't change user from chroot user."); 1007 return; 1008 } 1009 end_login(); 1010 } 1011 1012 guest = 0; 1013 #ifdef VIRTUAL_HOSTING 1014 pw = sgetpwnam(thishost->anonuser); 1015 #else 1016 pw = sgetpwnam("ftp"); 1017 #endif 1018 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1019 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 1020 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 1021 reply(530, "User %s access denied.", name); 1022 else if (pw != NULL) { 1023 guest = 1; 1024 askpasswd = 1; 1025 reply(331, 1026 "Guest login ok, send your email address as password."); 1027 } else 1028 reply(530, "User %s unknown.", name); 1029 if (!askpasswd && logging) 1030 syslog(LOG_NOTICE, 1031 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1032 return; 1033 } 1034 if (anon_only != 0) { 1035 reply(530, "Sorry, only anonymous ftp allowed."); 1036 return; 1037 } 1038 1039 if ((pw = sgetpwnam(name))) { 1040 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1041 shell = _PATH_BSHELL; 1042 setusershell(); 1043 while ((cp = getusershell()) != NULL) 1044 if (strcmp(cp, shell) == 0) 1045 break; 1046 endusershell(); 1047 1048 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1049 reply(530, "User %s access denied.", name); 1050 if (logging) 1051 syslog(LOG_NOTICE, 1052 "FTP LOGIN REFUSED FROM %s, %s", 1053 remotehost, name); 1054 pw = NULL; 1055 return; 1056 } 1057 } 1058 if (logging) 1059 strncpy(curname, name, sizeof(curname)-1); 1060 1061 pwok = 0; 1062 #ifdef USE_PAM 1063 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1064 #endif 1065 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1066 pwok = (pw != NULL) && 1067 opieaccessfile(remotehost) && 1068 opiealways(pw->pw_dir); 1069 reply(331, "Response to %s %s for %s.", 1070 opieprompt, pwok ? "requested" : "required", name); 1071 } else { 1072 pwok = 1; 1073 reply(331, "Password required for %s.", name); 1074 } 1075 askpasswd = 1; 1076 /* 1077 * Delay before reading passwd after first failed 1078 * attempt to slow down passwd-guessing programs. 1079 */ 1080 if (login_attempts) 1081 sleep(login_attempts); 1082 } 1083 1084 /* 1085 * Check if a user is in the file "fname", 1086 * return a pointer to a malloc'd string with the rest 1087 * of the matching line in "residue" if not NULL. 1088 */ 1089 static int 1090 checkuser(char *fname, char *name, int pwset, char **residue) 1091 { 1092 FILE *fd; 1093 int found = 0; 1094 size_t len; 1095 char *line, *mp, *p; 1096 1097 if ((fd = fopen(fname, "r")) != NULL) { 1098 while (!found && (line = fgetln(fd, &len)) != NULL) { 1099 /* skip comments */ 1100 if (line[0] == '#') 1101 continue; 1102 if (line[len - 1] == '\n') { 1103 line[len - 1] = '\0'; 1104 mp = NULL; 1105 } else { 1106 if ((mp = malloc(len + 1)) == NULL) 1107 fatalerror("Ran out of memory."); 1108 memcpy(mp, line, len); 1109 mp[len] = '\0'; 1110 line = mp; 1111 } 1112 /* avoid possible leading and trailing whitespace */ 1113 p = strtok(line, " \t"); 1114 /* skip empty lines */ 1115 if (p == NULL) 1116 goto nextline; 1117 /* 1118 * if first chr is '@', check group membership 1119 */ 1120 if (p[0] == '@') { 1121 int i = 0; 1122 struct group *grp; 1123 1124 if (p[1] == '\0') /* single @ matches anyone */ 1125 found = 1; 1126 else { 1127 if ((grp = getgrnam(p+1)) == NULL) 1128 goto nextline; 1129 /* 1130 * Check user's default group 1131 */ 1132 if (pwset && grp->gr_gid == pw->pw_gid) 1133 found = 1; 1134 /* 1135 * Check supplementary groups 1136 */ 1137 while (!found && grp->gr_mem[i]) 1138 found = strcmp(name, 1139 grp->gr_mem[i++]) 1140 == 0; 1141 } 1142 } 1143 /* 1144 * Otherwise, just check for username match 1145 */ 1146 else 1147 found = strcmp(p, name) == 0; 1148 /* 1149 * Save the rest of line to "residue" if matched 1150 */ 1151 if (found && residue) { 1152 if ((p = strtok(NULL, "")) != NULL) 1153 p += strspn(p, " \t"); 1154 if (p && *p) { 1155 if ((*residue = strdup(p)) == NULL) 1156 fatalerror("Ran out of memory."); 1157 } else 1158 *residue = NULL; 1159 } 1160 nextline: 1161 if (mp) 1162 free(mp); 1163 } 1164 (void) fclose(fd); 1165 } 1166 return (found); 1167 } 1168 1169 /* 1170 * Terminate login as previous user, if any, resetting state; 1171 * used when USER command is given or login fails. 1172 */ 1173 static void 1174 end_login(void) 1175 { 1176 #ifdef USE_PAM 1177 int e; 1178 #endif 1179 1180 (void) seteuid(0); 1181 if (logged_in && dowtmp) 1182 ftpd_logwtmp(wtmpid, NULL, NULL); 1183 pw = NULL; 1184 #ifdef LOGIN_CAP 1185 setusercontext(NULL, getpwuid(0), 0, 1186 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1187 LOGIN_SETMAC); 1188 #endif 1189 #ifdef USE_PAM 1190 if (pamh) { 1191 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1192 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1193 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1194 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1195 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1196 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1197 pamh = NULL; 1198 } 1199 #endif 1200 logged_in = 0; 1201 guest = 0; 1202 dochroot = 0; 1203 } 1204 1205 #ifdef USE_PAM 1206 1207 /* 1208 * the following code is stolen from imap-uw PAM authentication module and 1209 * login.c 1210 */ 1211 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1212 1213 struct cred_t { 1214 const char *uname; /* user name */ 1215 const char *pass; /* password */ 1216 }; 1217 typedef struct cred_t cred_t; 1218 1219 static int 1220 auth_conv(int num_msg, const struct pam_message **msg, 1221 struct pam_response **resp, void *appdata) 1222 { 1223 int i; 1224 cred_t *cred = (cred_t *) appdata; 1225 struct pam_response *reply; 1226 1227 reply = calloc(num_msg, sizeof *reply); 1228 if (reply == NULL) 1229 return PAM_BUF_ERR; 1230 1231 for (i = 0; i < num_msg; i++) { 1232 switch (msg[i]->msg_style) { 1233 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1234 reply[i].resp_retcode = PAM_SUCCESS; 1235 reply[i].resp = COPY_STRING(cred->uname); 1236 /* PAM frees resp. */ 1237 break; 1238 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1239 reply[i].resp_retcode = PAM_SUCCESS; 1240 reply[i].resp = COPY_STRING(cred->pass); 1241 /* PAM frees resp. */ 1242 break; 1243 case PAM_TEXT_INFO: 1244 case PAM_ERROR_MSG: 1245 reply[i].resp_retcode = PAM_SUCCESS; 1246 reply[i].resp = NULL; 1247 break; 1248 default: /* unknown message style */ 1249 free(reply); 1250 return PAM_CONV_ERR; 1251 } 1252 } 1253 1254 *resp = reply; 1255 return PAM_SUCCESS; 1256 } 1257 1258 /* 1259 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1260 * authenticated, or 1 if not authenticated. If some sort of PAM system 1261 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1262 * function returns -1. This can be used as an indication that we should 1263 * fall back to a different authentication mechanism. 1264 */ 1265 static int 1266 auth_pam(struct passwd **ppw, const char *pass) 1267 { 1268 const char *tmpl_user; 1269 const void *item; 1270 int rval; 1271 int e; 1272 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1273 struct pam_conv conv = { &auth_conv, &auth_cred }; 1274 1275 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1276 if (e != PAM_SUCCESS) { 1277 /* 1278 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1279 * if context creation has failed in the first place. 1280 */ 1281 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1282 return -1; 1283 } 1284 1285 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1286 if (e != PAM_SUCCESS) { 1287 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1288 pam_strerror(pamh, e)); 1289 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1290 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1291 } 1292 pamh = NULL; 1293 return -1; 1294 } 1295 1296 e = pam_authenticate(pamh, 0); 1297 switch (e) { 1298 case PAM_SUCCESS: 1299 /* 1300 * With PAM we support the concept of a "template" 1301 * user. The user enters a login name which is 1302 * authenticated by PAM, usually via a remote service 1303 * such as RADIUS or TACACS+. If authentication 1304 * succeeds, a different but related "template" name 1305 * is used for setting the credentials, shell, and 1306 * home directory. The name the user enters need only 1307 * exist on the remote authentication server, but the 1308 * template name must be present in the local password 1309 * database. 1310 * 1311 * This is supported by two various mechanisms in the 1312 * individual modules. However, from the application's 1313 * point of view, the template user is always passed 1314 * back as a changed value of the PAM_USER item. 1315 */ 1316 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1317 PAM_SUCCESS) { 1318 tmpl_user = (const char *) item; 1319 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1320 *ppw = getpwnam(tmpl_user); 1321 } else 1322 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1323 pam_strerror(pamh, e)); 1324 rval = 0; 1325 break; 1326 1327 case PAM_AUTH_ERR: 1328 case PAM_USER_UNKNOWN: 1329 case PAM_MAXTRIES: 1330 rval = 1; 1331 break; 1332 1333 default: 1334 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1335 rval = -1; 1336 break; 1337 } 1338 1339 if (rval == 0) { 1340 e = pam_acct_mgmt(pamh, 0); 1341 if (e != PAM_SUCCESS) { 1342 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1343 pam_strerror(pamh, e)); 1344 rval = 1; 1345 } 1346 } 1347 1348 if (rval != 0) { 1349 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1350 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1351 } 1352 pamh = NULL; 1353 } 1354 return rval; 1355 } 1356 1357 #endif /* USE_PAM */ 1358 1359 void 1360 pass(char *passwd) 1361 { 1362 int rval; 1363 FILE *fd; 1364 #ifdef LOGIN_CAP 1365 login_cap_t *lc = NULL; 1366 #endif 1367 #ifdef USE_PAM 1368 int e; 1369 #endif 1370 char *residue = NULL; 1371 char *xpasswd; 1372 1373 if (logged_in || askpasswd == 0) { 1374 reply(503, "Login with USER first."); 1375 return; 1376 } 1377 askpasswd = 0; 1378 if (!guest) { /* "ftp" is only account allowed no password */ 1379 if (pw == NULL) { 1380 rval = 1; /* failure below */ 1381 goto skip; 1382 } 1383 #ifdef USE_PAM 1384 rval = auth_pam(&pw, passwd); 1385 if (rval >= 0) { 1386 opieunlock(); 1387 goto skip; 1388 } 1389 #endif 1390 if (opieverify(&opiedata, passwd) == 0) 1391 xpasswd = pw->pw_passwd; 1392 else if (pwok) { 1393 xpasswd = crypt(passwd, pw->pw_passwd); 1394 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1395 xpasswd = ":"; 1396 } else { 1397 rval = 1; 1398 goto skip; 1399 } 1400 rval = strcmp(pw->pw_passwd, xpasswd); 1401 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1402 rval = 1; /* failure */ 1403 skip: 1404 /* 1405 * If rval == 1, the user failed the authentication check 1406 * above. If rval == 0, either PAM or local authentication 1407 * succeeded. 1408 */ 1409 if (rval) { 1410 reply(530, "Login incorrect."); 1411 if (logging) { 1412 syslog(LOG_NOTICE, 1413 "FTP LOGIN FAILED FROM %s", 1414 remotehost); 1415 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1416 "FTP LOGIN FAILED FROM %s, %s", 1417 remotehost, curname); 1418 } 1419 pw = NULL; 1420 if (login_attempts++ >= 5) { 1421 syslog(LOG_NOTICE, 1422 "repeated login failures from %s", 1423 remotehost); 1424 exit(0); 1425 } 1426 return; 1427 } 1428 } 1429 login_attempts = 0; /* this time successful */ 1430 if (setegid(pw->pw_gid) < 0) { 1431 reply(550, "Can't set gid."); 1432 return; 1433 } 1434 /* May be overridden by login.conf */ 1435 (void) umask(defumask); 1436 #ifdef LOGIN_CAP 1437 if ((lc = login_getpwclass(pw)) != NULL) { 1438 char remote_ip[NI_MAXHOST]; 1439 1440 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1441 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1442 NI_NUMERICHOST)) 1443 *remote_ip = 0; 1444 remote_ip[sizeof(remote_ip) - 1] = 0; 1445 if (!auth_hostok(lc, remotehost, remote_ip)) { 1446 syslog(LOG_INFO|LOG_AUTH, 1447 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1448 pw->pw_name); 1449 reply(530, "Permission denied."); 1450 pw = NULL; 1451 return; 1452 } 1453 if (!auth_timeok(lc, time(NULL))) { 1454 reply(530, "Login not available right now."); 1455 pw = NULL; 1456 return; 1457 } 1458 } 1459 setusercontext(lc, pw, 0, 1460 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1461 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1462 #else 1463 setlogin(pw->pw_name); 1464 (void) initgroups(pw->pw_name, pw->pw_gid); 1465 #endif 1466 1467 #ifdef USE_PAM 1468 if (pamh) { 1469 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1470 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1471 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1472 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1473 } 1474 } 1475 #endif 1476 1477 dochroot = 1478 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1479 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1480 || login_getcapbool(lc, "ftp-chroot", 0) 1481 #endif 1482 ; 1483 chrootdir = NULL; 1484 1485 /* Disable wtmp logging when chrooting. */ 1486 if (dochroot || guest) 1487 dowtmp = 0; 1488 if (dowtmp) 1489 ftpd_logwtmp(wtmpid, pw->pw_name, 1490 (struct sockaddr *)&his_addr); 1491 logged_in = 1; 1492 1493 if (guest && stats && statfd < 0) 1494 #ifdef VIRTUAL_HOSTING 1495 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1496 #else 1497 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1498 #endif 1499 if (statfd < 0) 1500 stats = 0; 1501 1502 /* 1503 * For a chrooted local user, 1504 * a) see whether ftpchroot(5) specifies a chroot directory, 1505 * b) extract the directory pathname from the line, 1506 * c) expand it to the absolute pathname if necessary. 1507 */ 1508 if (dochroot && residue && 1509 (chrootdir = strtok(residue, " \t")) != NULL) { 1510 if (chrootdir[0] != '/') 1511 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1512 else 1513 chrootdir = strdup(chrootdir); /* make it permanent */ 1514 if (chrootdir == NULL) 1515 fatalerror("Ran out of memory."); 1516 } 1517 if (guest || dochroot) { 1518 /* 1519 * If no chroot directory set yet, use the login directory. 1520 * Copy it so it can be modified while pw->pw_dir stays intact. 1521 */ 1522 if (chrootdir == NULL && 1523 (chrootdir = strdup(pw->pw_dir)) == NULL) 1524 fatalerror("Ran out of memory."); 1525 /* 1526 * Check for the "/chroot/./home" syntax, 1527 * separate the chroot and home directory pathnames. 1528 */ 1529 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1530 *(homedir++) = '\0'; /* wipe '/' */ 1531 homedir++; /* skip '.' */ 1532 } else { 1533 /* 1534 * We MUST do a chdir() after the chroot. Otherwise 1535 * the old current directory will be accessible as "." 1536 * outside the new root! 1537 */ 1538 homedir = "/"; 1539 } 1540 /* 1541 * Finally, do chroot() 1542 */ 1543 if (chroot(chrootdir) < 0) { 1544 reply(550, "Can't change root."); 1545 goto bad; 1546 } 1547 } else /* real user w/o chroot */ 1548 homedir = pw->pw_dir; 1549 /* 1550 * Set euid *before* doing chdir() so 1551 * a) the user won't be carried to a directory that he couldn't reach 1552 * on his own due to no permission to upper path components, 1553 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1554 * (uid 0 has no root power over NFS if not mapped explicitly.) 1555 */ 1556 if (seteuid(pw->pw_uid) < 0) { 1557 reply(550, "Can't set uid."); 1558 goto bad; 1559 } 1560 if (chdir(homedir) < 0) { 1561 if (guest || dochroot) { 1562 reply(550, "Can't change to base directory."); 1563 goto bad; 1564 } else { 1565 if (chdir("/") < 0) { 1566 reply(550, "Root is inaccessible."); 1567 goto bad; 1568 } 1569 lreply(230, "No directory! Logging in with home=/."); 1570 } 1571 } 1572 1573 /* 1574 * Display a login message, if it exists. 1575 * N.B. reply(230,) must follow the message. 1576 */ 1577 #ifdef VIRTUAL_HOSTING 1578 fd = fopen(thishost->loginmsg, "r"); 1579 #else 1580 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1581 #endif 1582 if (fd != NULL) { 1583 char *cp, line[LINE_MAX]; 1584 1585 while (fgets(line, sizeof(line), fd) != NULL) { 1586 if ((cp = strchr(line, '\n')) != NULL) 1587 *cp = '\0'; 1588 lreply(230, "%s", line); 1589 } 1590 (void) fflush(stdout); 1591 (void) fclose(fd); 1592 } 1593 if (guest) { 1594 if (ident != NULL) 1595 free(ident); 1596 ident = strdup(passwd); 1597 if (ident == NULL) 1598 fatalerror("Ran out of memory."); 1599 1600 reply(230, "Guest login ok, access restrictions apply."); 1601 #ifdef SETPROCTITLE 1602 #ifdef VIRTUAL_HOSTING 1603 if (thishost != firsthost) 1604 snprintf(proctitle, sizeof(proctitle), 1605 "%s: anonymous(%s)/%s", remotehost, hostname, 1606 passwd); 1607 else 1608 #endif 1609 snprintf(proctitle, sizeof(proctitle), 1610 "%s: anonymous/%s", remotehost, passwd); 1611 setproctitle("%s", proctitle); 1612 #endif /* SETPROCTITLE */ 1613 if (logging) 1614 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1615 remotehost, passwd); 1616 } else { 1617 if (dochroot) 1618 reply(230, "User %s logged in, " 1619 "access restrictions apply.", pw->pw_name); 1620 else 1621 reply(230, "User %s logged in.", pw->pw_name); 1622 1623 #ifdef SETPROCTITLE 1624 snprintf(proctitle, sizeof(proctitle), 1625 "%s: user/%s", remotehost, pw->pw_name); 1626 setproctitle("%s", proctitle); 1627 #endif /* SETPROCTITLE */ 1628 if (logging) 1629 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1630 remotehost, pw->pw_name); 1631 } 1632 if (logging && (guest || dochroot)) 1633 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1634 #ifdef LOGIN_CAP 1635 login_close(lc); 1636 #endif 1637 if (residue) 1638 free(residue); 1639 return; 1640 bad: 1641 /* Forget all about it... */ 1642 #ifdef LOGIN_CAP 1643 login_close(lc); 1644 #endif 1645 if (residue) 1646 free(residue); 1647 end_login(); 1648 } 1649 1650 void 1651 retrieve(char *cmd, char *name) 1652 { 1653 FILE *fin, *dout; 1654 struct stat st; 1655 int (*closefunc)(FILE *); 1656 time_t start; 1657 1658 if (cmd == 0) { 1659 fin = fopen(name, "r"), closefunc = fclose; 1660 st.st_size = 0; 1661 } else { 1662 char line[BUFSIZ]; 1663 1664 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1665 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1666 st.st_size = -1; 1667 st.st_blksize = BUFSIZ; 1668 } 1669 if (fin == NULL) { 1670 if (errno != 0) { 1671 perror_reply(550, name); 1672 if (cmd == 0) { 1673 LOGCMD("get", name); 1674 } 1675 } 1676 return; 1677 } 1678 byte_count = -1; 1679 if (cmd == 0) { 1680 if (fstat(fileno(fin), &st) < 0) { 1681 perror_reply(550, name); 1682 goto done; 1683 } 1684 if (!S_ISREG(st.st_mode)) { 1685 /* 1686 * Never sending a raw directory is a workaround 1687 * for buggy clients that will attempt to RETR 1688 * a directory before listing it, e.g., Mozilla. 1689 * Preventing a guest from getting irregular files 1690 * is a simple security measure. 1691 */ 1692 if (S_ISDIR(st.st_mode) || guest) { 1693 reply(550, "%s: not a plain file.", name); 1694 goto done; 1695 } 1696 st.st_size = -1; 1697 /* st.st_blksize is set for all descriptor types */ 1698 } 1699 } 1700 if (restart_point) { 1701 if (type == TYPE_A) { 1702 off_t i, n; 1703 int c; 1704 1705 n = restart_point; 1706 i = 0; 1707 while (i++ < n) { 1708 if ((c=getc(fin)) == EOF) { 1709 perror_reply(550, name); 1710 goto done; 1711 } 1712 if (c == '\n') 1713 i++; 1714 } 1715 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1716 perror_reply(550, name); 1717 goto done; 1718 } 1719 } 1720 dout = dataconn(name, st.st_size, "w"); 1721 if (dout == NULL) 1722 goto done; 1723 time(&start); 1724 send_data(fin, dout, st.st_blksize, st.st_size, 1725 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1726 if (cmd == 0 && guest && stats && byte_count > 0) 1727 logxfer(name, byte_count, start); 1728 (void) fclose(dout); 1729 data = -1; 1730 pdata = -1; 1731 done: 1732 if (cmd == 0) 1733 LOGBYTES("get", name, byte_count); 1734 (*closefunc)(fin); 1735 } 1736 1737 void 1738 store(char *name, char *mode, int unique) 1739 { 1740 int fd; 1741 FILE *fout, *din; 1742 int (*closefunc)(FILE *); 1743 1744 if (*mode == 'a') { /* APPE */ 1745 if (unique) { 1746 /* Programming error */ 1747 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1748 unique = 0; 1749 } 1750 if (guest && noguestmod) { 1751 reply(550, "Appending to existing file denied."); 1752 goto err; 1753 } 1754 restart_point = 0; /* not affected by preceding REST */ 1755 } 1756 if (unique) /* STOU overrides REST */ 1757 restart_point = 0; 1758 if (guest && noguestmod) { 1759 if (restart_point) { /* guest STOR w/REST */ 1760 reply(550, "Modifying existing file denied."); 1761 goto err; 1762 } else /* treat guest STOR as STOU */ 1763 unique = 1; 1764 } 1765 1766 if (restart_point) 1767 mode = "r+"; /* so ASCII manual seek can work */ 1768 if (unique) { 1769 if ((fd = guniquefd(name, &name)) < 0) 1770 goto err; 1771 fout = fdopen(fd, mode); 1772 } else 1773 fout = fopen(name, mode); 1774 closefunc = fclose; 1775 if (fout == NULL) { 1776 perror_reply(553, name); 1777 goto err; 1778 } 1779 byte_count = -1; 1780 if (restart_point) { 1781 if (type == TYPE_A) { 1782 off_t i, n; 1783 int c; 1784 1785 n = restart_point; 1786 i = 0; 1787 while (i++ < n) { 1788 if ((c=getc(fout)) == EOF) { 1789 perror_reply(550, name); 1790 goto done; 1791 } 1792 if (c == '\n') 1793 i++; 1794 } 1795 /* 1796 * We must do this seek to "current" position 1797 * because we are changing from reading to 1798 * writing. 1799 */ 1800 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1801 perror_reply(550, name); 1802 goto done; 1803 } 1804 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1805 perror_reply(550, name); 1806 goto done; 1807 } 1808 } 1809 din = dataconn(name, -1, "r"); 1810 if (din == NULL) 1811 goto done; 1812 if (receive_data(din, fout) == 0) { 1813 if (unique) 1814 reply(226, "Transfer complete (unique file name:%s).", 1815 name); 1816 else 1817 reply(226, "Transfer complete."); 1818 } 1819 (void) fclose(din); 1820 data = -1; 1821 pdata = -1; 1822 done: 1823 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1824 (*closefunc)(fout); 1825 return; 1826 err: 1827 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1828 return; 1829 } 1830 1831 static FILE * 1832 getdatasock(char *mode) 1833 { 1834 int on = 1, s, t, tries; 1835 1836 if (data >= 0) 1837 return (fdopen(data, mode)); 1838 1839 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1840 if (s < 0) 1841 goto bad; 1842 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1843 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1844 /* anchor socket to avoid multi-homing problems */ 1845 data_source = ctrl_addr; 1846 data_source.su_port = htons(dataport); 1847 (void) seteuid(0); 1848 for (tries = 1; ; tries++) { 1849 /* 1850 * We should loop here since it's possible that 1851 * another ftpd instance has passed this point and is 1852 * trying to open a data connection in active mode now. 1853 * Until the other connection is opened, we'll be getting 1854 * EADDRINUSE because no SOCK_STREAM sockets in the system 1855 * can share both local and remote addresses, localIP:20 1856 * and *:* in this case. 1857 */ 1858 if (bind(s, (struct sockaddr *)&data_source, 1859 data_source.su_len) >= 0) 1860 break; 1861 if (errno != EADDRINUSE || tries > 10) 1862 goto bad; 1863 sleep(tries); 1864 } 1865 (void) seteuid(pw->pw_uid); 1866 #ifdef IP_TOS 1867 if (data_source.su_family == AF_INET) 1868 { 1869 on = IPTOS_THROUGHPUT; 1870 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1871 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1872 } 1873 #endif 1874 #ifdef TCP_NOPUSH 1875 /* 1876 * Turn off push flag to keep sender TCP from sending short packets 1877 * at the boundaries of each write(). 1878 */ 1879 on = 1; 1880 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1881 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1882 #endif 1883 return (fdopen(s, mode)); 1884 bad: 1885 /* Return the real value of errno (close may change it) */ 1886 t = errno; 1887 (void) seteuid(pw->pw_uid); 1888 (void) close(s); 1889 errno = t; 1890 return (NULL); 1891 } 1892 1893 static FILE * 1894 dataconn(char *name, off_t size, char *mode) 1895 { 1896 char sizebuf[32]; 1897 FILE *file; 1898 int retry = 0, tos, conerrno; 1899 1900 file_size = size; 1901 byte_count = 0; 1902 if (size != -1) 1903 (void) snprintf(sizebuf, sizeof(sizebuf), 1904 " (%jd bytes)", (intmax_t)size); 1905 else 1906 *sizebuf = '\0'; 1907 if (pdata >= 0) { 1908 union sockunion from; 1909 socklen_t fromlen = ctrl_addr.su_len; 1910 int flags, s; 1911 struct timeval timeout; 1912 fd_set set; 1913 1914 FD_ZERO(&set); 1915 FD_SET(pdata, &set); 1916 1917 timeout.tv_usec = 0; 1918 timeout.tv_sec = 120; 1919 1920 /* 1921 * Granted a socket is in the blocking I/O mode, 1922 * accept() will block after a successful select() 1923 * if the selected connection dies in between. 1924 * Therefore set the non-blocking I/O flag here. 1925 */ 1926 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1927 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1928 goto pdata_err; 1929 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1930 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1931 goto pdata_err; 1932 (void) close(pdata); 1933 pdata = s; 1934 /* 1935 * Unset the inherited non-blocking I/O flag 1936 * on the child socket so stdio can work on it. 1937 */ 1938 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1939 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1940 goto pdata_err; 1941 #ifdef IP_TOS 1942 if (from.su_family == AF_INET) 1943 { 1944 tos = IPTOS_THROUGHPUT; 1945 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1946 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1947 } 1948 #endif 1949 reply(150, "Opening %s mode data connection for '%s'%s.", 1950 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1951 return (fdopen(pdata, mode)); 1952 pdata_err: 1953 reply(425, "Can't open data connection."); 1954 (void) close(pdata); 1955 pdata = -1; 1956 return (NULL); 1957 } 1958 if (data >= 0) { 1959 reply(125, "Using existing data connection for '%s'%s.", 1960 name, sizebuf); 1961 usedefault = 1; 1962 return (fdopen(data, mode)); 1963 } 1964 if (usedefault) 1965 data_dest = his_addr; 1966 usedefault = 1; 1967 do { 1968 file = getdatasock(mode); 1969 if (file == NULL) { 1970 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1971 1972 if (getnameinfo((struct sockaddr *)&data_source, 1973 data_source.su_len, 1974 hostbuf, sizeof(hostbuf) - 1, 1975 portbuf, sizeof(portbuf) - 1, 1976 NI_NUMERICHOST|NI_NUMERICSERV)) 1977 *hostbuf = *portbuf = 0; 1978 hostbuf[sizeof(hostbuf) - 1] = 0; 1979 portbuf[sizeof(portbuf) - 1] = 0; 1980 reply(425, "Can't create data socket (%s,%s): %s.", 1981 hostbuf, portbuf, strerror(errno)); 1982 return (NULL); 1983 } 1984 data = fileno(file); 1985 conerrno = 0; 1986 if (connect(data, (struct sockaddr *)&data_dest, 1987 data_dest.su_len) == 0) 1988 break; 1989 conerrno = errno; 1990 (void) fclose(file); 1991 data = -1; 1992 if (conerrno == EADDRINUSE) { 1993 sleep(swaitint); 1994 retry += swaitint; 1995 } else { 1996 break; 1997 } 1998 } while (retry <= swaitmax); 1999 if (conerrno != 0) { 2000 reply(425, "Can't build data connection: %s.", 2001 strerror(conerrno)); 2002 return (NULL); 2003 } 2004 reply(150, "Opening %s mode data connection for '%s'%s.", 2005 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2006 return (file); 2007 } 2008 2009 /* 2010 * A helper macro to avoid code duplication 2011 * in send_data() and receive_data(). 2012 * 2013 * XXX We have to block SIGURG during putc() because BSD stdio 2014 * is unable to restart interrupted write operations and hence 2015 * the entire buffer contents will be lost as soon as a write() 2016 * call indicates EINTR to stdio. 2017 */ 2018 #define FTPD_PUTC(ch, file, label) \ 2019 do { \ 2020 int ret; \ 2021 \ 2022 do { \ 2023 START_UNSAFE; \ 2024 ret = putc((ch), (file)); \ 2025 END_UNSAFE; \ 2026 CHECKOOB(return (-1)) \ 2027 else if (ferror(file)) \ 2028 goto label; \ 2029 clearerr(file); \ 2030 } while (ret == EOF); \ 2031 } while (0) 2032 2033 /* 2034 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2035 * encapsulation of the data subject to Mode, Structure, and Type. 2036 * 2037 * NB: Form isn't handled. 2038 */ 2039 static int 2040 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2041 { 2042 int c, cp, filefd, netfd; 2043 char *buf; 2044 2045 STARTXFER; 2046 2047 switch (type) { 2048 2049 case TYPE_A: 2050 cp = EOF; 2051 for (;;) { 2052 c = getc(instr); 2053 CHECKOOB(return (-1)) 2054 else if (c == EOF && ferror(instr)) 2055 goto file_err; 2056 if (c == EOF) { 2057 if (ferror(instr)) { /* resume after OOB */ 2058 clearerr(instr); 2059 continue; 2060 } 2061 if (feof(instr)) /* EOF */ 2062 break; 2063 syslog(LOG_ERR, "Internal: impossible condition" 2064 " on file after getc()"); 2065 goto file_err; 2066 } 2067 if (c == '\n' && cp != '\r') { 2068 FTPD_PUTC('\r', outstr, data_err); 2069 byte_count++; 2070 } 2071 FTPD_PUTC(c, outstr, data_err); 2072 byte_count++; 2073 cp = c; 2074 } 2075 #ifdef notyet /* BSD stdio isn't ready for that */ 2076 while (fflush(outstr) == EOF) { 2077 CHECKOOB(return (-1)) 2078 else 2079 goto data_err; 2080 clearerr(outstr); 2081 } 2082 ENDXFER; 2083 #else 2084 ENDXFER; 2085 if (fflush(outstr) == EOF) 2086 goto data_err; 2087 #endif 2088 reply(226, "Transfer complete."); 2089 return (0); 2090 2091 case TYPE_I: 2092 case TYPE_L: 2093 /* 2094 * isreg is only set if we are not doing restart and we 2095 * are sending a regular file 2096 */ 2097 netfd = fileno(outstr); 2098 filefd = fileno(instr); 2099 2100 if (isreg) { 2101 char *msg = "Transfer complete."; 2102 off_t cnt, offset; 2103 int err; 2104 2105 cnt = offset = 0; 2106 2107 while (filesize > 0) { 2108 err = sendfile(filefd, netfd, offset, 0, 2109 NULL, &cnt, 0); 2110 /* 2111 * Calculate byte_count before OOB processing. 2112 * It can be used in myoob() later. 2113 */ 2114 byte_count += cnt; 2115 offset += cnt; 2116 filesize -= cnt; 2117 CHECKOOB(return (-1)) 2118 else if (err == -1) { 2119 if (errno != EINTR && 2120 cnt == 0 && offset == 0) 2121 goto oldway; 2122 goto data_err; 2123 } 2124 if (err == -1) /* resume after OOB */ 2125 continue; 2126 /* 2127 * We hit the EOF prematurely. 2128 * Perhaps the file was externally truncated. 2129 */ 2130 if (cnt == 0) { 2131 msg = "Transfer finished due to " 2132 "premature end of file."; 2133 break; 2134 } 2135 } 2136 ENDXFER; 2137 reply(226, msg); 2138 return (0); 2139 } 2140 2141 oldway: 2142 if ((buf = malloc(blksize)) == NULL) { 2143 ENDXFER; 2144 reply(451, "Ran out of memory."); 2145 return (-1); 2146 } 2147 2148 for (;;) { 2149 int cnt, len; 2150 char *bp; 2151 2152 cnt = read(filefd, buf, blksize); 2153 CHECKOOB(free(buf); return (-1)) 2154 else if (cnt < 0) { 2155 free(buf); 2156 goto file_err; 2157 } 2158 if (cnt < 0) /* resume after OOB */ 2159 continue; 2160 if (cnt == 0) /* EOF */ 2161 break; 2162 for (len = cnt, bp = buf; len > 0;) { 2163 cnt = write(netfd, bp, len); 2164 CHECKOOB(free(buf); return (-1)) 2165 else if (cnt < 0) { 2166 free(buf); 2167 goto data_err; 2168 } 2169 if (cnt <= 0) 2170 continue; 2171 len -= cnt; 2172 bp += cnt; 2173 byte_count += cnt; 2174 } 2175 } 2176 ENDXFER; 2177 free(buf); 2178 reply(226, "Transfer complete."); 2179 return (0); 2180 default: 2181 ENDXFER; 2182 reply(550, "Unimplemented TYPE %d in send_data.", type); 2183 return (-1); 2184 } 2185 2186 data_err: 2187 ENDXFER; 2188 perror_reply(426, "Data connection"); 2189 return (-1); 2190 2191 file_err: 2192 ENDXFER; 2193 perror_reply(551, "Error on input file"); 2194 return (-1); 2195 } 2196 2197 /* 2198 * Transfer data from peer to "outstr" using the appropriate encapulation of 2199 * the data subject to Mode, Structure, and Type. 2200 * 2201 * N.B.: Form isn't handled. 2202 */ 2203 static int 2204 receive_data(FILE *instr, FILE *outstr) 2205 { 2206 int c, cp; 2207 int bare_lfs = 0; 2208 2209 STARTXFER; 2210 2211 switch (type) { 2212 2213 case TYPE_I: 2214 case TYPE_L: 2215 for (;;) { 2216 int cnt, len; 2217 char *bp; 2218 char buf[BUFSIZ]; 2219 2220 cnt = read(fileno(instr), buf, sizeof(buf)); 2221 CHECKOOB(return (-1)) 2222 else if (cnt < 0) 2223 goto data_err; 2224 if (cnt < 0) /* resume after OOB */ 2225 continue; 2226 if (cnt == 0) /* EOF */ 2227 break; 2228 for (len = cnt, bp = buf; len > 0;) { 2229 cnt = write(fileno(outstr), bp, len); 2230 CHECKOOB(return (-1)) 2231 else if (cnt < 0) 2232 goto file_err; 2233 if (cnt <= 0) 2234 continue; 2235 len -= cnt; 2236 bp += cnt; 2237 byte_count += cnt; 2238 } 2239 } 2240 ENDXFER; 2241 return (0); 2242 2243 case TYPE_E: 2244 ENDXFER; 2245 reply(553, "TYPE E not implemented."); 2246 return (-1); 2247 2248 case TYPE_A: 2249 cp = EOF; 2250 for (;;) { 2251 c = getc(instr); 2252 CHECKOOB(return (-1)) 2253 else if (c == EOF && ferror(instr)) 2254 goto data_err; 2255 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2256 clearerr(instr); 2257 continue; 2258 } 2259 2260 if (cp == '\r') { 2261 if (c != '\n') 2262 FTPD_PUTC('\r', outstr, file_err); 2263 } else 2264 if (c == '\n') 2265 bare_lfs++; 2266 if (c == '\r') { 2267 byte_count++; 2268 cp = c; 2269 continue; 2270 } 2271 2272 /* Check for EOF here in order not to lose last \r. */ 2273 if (c == EOF) { 2274 if (feof(instr)) /* EOF */ 2275 break; 2276 syslog(LOG_ERR, "Internal: impossible condition" 2277 " on data stream after getc()"); 2278 goto data_err; 2279 } 2280 2281 byte_count++; 2282 FTPD_PUTC(c, outstr, file_err); 2283 cp = c; 2284 } 2285 #ifdef notyet /* BSD stdio isn't ready for that */ 2286 while (fflush(outstr) == EOF) { 2287 CHECKOOB(return (-1)) 2288 else 2289 goto file_err; 2290 clearerr(outstr); 2291 } 2292 ENDXFER; 2293 #else 2294 ENDXFER; 2295 if (fflush(outstr) == EOF) 2296 goto file_err; 2297 #endif 2298 if (bare_lfs) { 2299 lreply(226, 2300 "WARNING! %d bare linefeeds received in ASCII mode.", 2301 bare_lfs); 2302 (void)printf(" File may not have transferred correctly.\r\n"); 2303 } 2304 return (0); 2305 default: 2306 ENDXFER; 2307 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2308 return (-1); 2309 } 2310 2311 data_err: 2312 ENDXFER; 2313 perror_reply(426, "Data connection"); 2314 return (-1); 2315 2316 file_err: 2317 ENDXFER; 2318 perror_reply(452, "Error writing to file"); 2319 return (-1); 2320 } 2321 2322 void 2323 statfilecmd(char *filename) 2324 { 2325 FILE *fin; 2326 int atstart; 2327 int c, code; 2328 char line[LINE_MAX]; 2329 struct stat st; 2330 2331 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2332 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2333 fin = ftpd_popen(line, "r"); 2334 lreply(code, "Status of %s:", filename); 2335 atstart = 1; 2336 while ((c = getc(fin)) != EOF) { 2337 if (c == '\n') { 2338 if (ferror(stdout)){ 2339 perror_reply(421, "Control connection"); 2340 (void) ftpd_pclose(fin); 2341 dologout(1); 2342 /* NOTREACHED */ 2343 } 2344 if (ferror(fin)) { 2345 perror_reply(551, filename); 2346 (void) ftpd_pclose(fin); 2347 return; 2348 } 2349 (void) putc('\r', stdout); 2350 } 2351 /* 2352 * RFC 959 says neutral text should be prepended before 2353 * a leading 3-digit number followed by whitespace, but 2354 * many ftp clients can be confused by any leading digits, 2355 * as a matter of fact. 2356 */ 2357 if (atstart && isdigit(c)) 2358 (void) putc(' ', stdout); 2359 (void) putc(c, stdout); 2360 atstart = (c == '\n'); 2361 } 2362 (void) ftpd_pclose(fin); 2363 reply(code, "End of status."); 2364 } 2365 2366 void 2367 statcmd(void) 2368 { 2369 union sockunion *su; 2370 u_char *a, *p; 2371 char hname[NI_MAXHOST]; 2372 int ispassive; 2373 2374 if (hostinfo) { 2375 lreply(211, "%s FTP server status:", hostname); 2376 printf(" %s\r\n", version); 2377 } else 2378 lreply(211, "FTP server status:"); 2379 printf(" Connected to %s", remotehost); 2380 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2381 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2382 hname[sizeof(hname) - 1] = 0; 2383 if (strcmp(hname, remotehost) != 0) 2384 printf(" (%s)", hname); 2385 } 2386 printf("\r\n"); 2387 if (logged_in) { 2388 if (guest) 2389 printf(" Logged in anonymously\r\n"); 2390 else 2391 printf(" Logged in as %s\r\n", pw->pw_name); 2392 } else if (askpasswd) 2393 printf(" Waiting for password\r\n"); 2394 else 2395 printf(" Waiting for user name\r\n"); 2396 printf(" TYPE: %s", typenames[type]); 2397 if (type == TYPE_A || type == TYPE_E) 2398 printf(", FORM: %s", formnames[form]); 2399 if (type == TYPE_L) 2400 #if CHAR_BIT == 8 2401 printf(" %d", CHAR_BIT); 2402 #else 2403 printf(" %d", bytesize); /* need definition! */ 2404 #endif 2405 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2406 strunames[stru], modenames[mode]); 2407 if (data != -1) 2408 printf(" Data connection open\r\n"); 2409 else if (pdata != -1) { 2410 ispassive = 1; 2411 su = &pasv_addr; 2412 goto printaddr; 2413 } else if (usedefault == 0) { 2414 ispassive = 0; 2415 su = &data_dest; 2416 printaddr: 2417 #define UC(b) (((int) b) & 0xff) 2418 if (epsvall) { 2419 printf(" EPSV only mode (EPSV ALL)\r\n"); 2420 goto epsvonly; 2421 } 2422 2423 /* PORT/PASV */ 2424 if (su->su_family == AF_INET) { 2425 a = (u_char *) &su->su_sin.sin_addr; 2426 p = (u_char *) &su->su_sin.sin_port; 2427 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2428 ispassive ? "PASV" : "PORT", 2429 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2430 UC(p[0]), UC(p[1])); 2431 } 2432 2433 /* LPRT/LPSV */ 2434 { 2435 int alen, af, i; 2436 2437 switch (su->su_family) { 2438 case AF_INET: 2439 a = (u_char *) &su->su_sin.sin_addr; 2440 p = (u_char *) &su->su_sin.sin_port; 2441 alen = sizeof(su->su_sin.sin_addr); 2442 af = 4; 2443 break; 2444 case AF_INET6: 2445 a = (u_char *) &su->su_sin6.sin6_addr; 2446 p = (u_char *) &su->su_sin6.sin6_port; 2447 alen = sizeof(su->su_sin6.sin6_addr); 2448 af = 6; 2449 break; 2450 default: 2451 af = 0; 2452 break; 2453 } 2454 if (af) { 2455 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2456 af, alen); 2457 for (i = 0; i < alen; i++) 2458 printf("%d,", UC(a[i])); 2459 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2460 } 2461 } 2462 2463 epsvonly:; 2464 /* EPRT/EPSV */ 2465 { 2466 int af; 2467 2468 switch (su->su_family) { 2469 case AF_INET: 2470 af = 1; 2471 break; 2472 case AF_INET6: 2473 af = 2; 2474 break; 2475 default: 2476 af = 0; 2477 break; 2478 } 2479 if (af) { 2480 union sockunion tmp; 2481 2482 tmp = *su; 2483 if (tmp.su_family == AF_INET6) 2484 tmp.su_sin6.sin6_scope_id = 0; 2485 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2486 hname, sizeof(hname) - 1, NULL, 0, 2487 NI_NUMERICHOST)) { 2488 hname[sizeof(hname) - 1] = 0; 2489 printf(" %s |%d|%s|%d|\r\n", 2490 ispassive ? "EPSV" : "EPRT", 2491 af, hname, htons(tmp.su_port)); 2492 } 2493 } 2494 } 2495 #undef UC 2496 } else 2497 printf(" No data connection\r\n"); 2498 reply(211, "End of status."); 2499 } 2500 2501 void 2502 fatalerror(char *s) 2503 { 2504 2505 reply(451, "Error in server: %s", s); 2506 reply(221, "Closing connection due to server error."); 2507 dologout(0); 2508 /* NOTREACHED */ 2509 } 2510 2511 void 2512 reply(int n, const char *fmt, ...) 2513 { 2514 va_list ap; 2515 2516 (void)printf("%d ", n); 2517 va_start(ap, fmt); 2518 (void)vprintf(fmt, ap); 2519 va_end(ap); 2520 (void)printf("\r\n"); 2521 (void)fflush(stdout); 2522 if (ftpdebug) { 2523 syslog(LOG_DEBUG, "<--- %d ", n); 2524 va_start(ap, fmt); 2525 vsyslog(LOG_DEBUG, fmt, ap); 2526 va_end(ap); 2527 } 2528 } 2529 2530 void 2531 lreply(int n, const char *fmt, ...) 2532 { 2533 va_list ap; 2534 2535 (void)printf("%d- ", n); 2536 va_start(ap, fmt); 2537 (void)vprintf(fmt, ap); 2538 va_end(ap); 2539 (void)printf("\r\n"); 2540 (void)fflush(stdout); 2541 if (ftpdebug) { 2542 syslog(LOG_DEBUG, "<--- %d- ", n); 2543 va_start(ap, fmt); 2544 vsyslog(LOG_DEBUG, fmt, ap); 2545 va_end(ap); 2546 } 2547 } 2548 2549 static void 2550 ack(char *s) 2551 { 2552 2553 reply(250, "%s command successful.", s); 2554 } 2555 2556 void 2557 nack(char *s) 2558 { 2559 2560 reply(502, "%s command not implemented.", s); 2561 } 2562 2563 /* ARGSUSED */ 2564 void 2565 yyerror(char *s) 2566 { 2567 char *cp; 2568 2569 if ((cp = strchr(cbuf,'\n'))) 2570 *cp = '\0'; 2571 reply(500, "%s: command not understood.", cbuf); 2572 } 2573 2574 void 2575 delete(char *name) 2576 { 2577 struct stat st; 2578 2579 LOGCMD("delete", name); 2580 if (lstat(name, &st) < 0) { 2581 perror_reply(550, name); 2582 return; 2583 } 2584 if (S_ISDIR(st.st_mode)) { 2585 if (rmdir(name) < 0) { 2586 perror_reply(550, name); 2587 return; 2588 } 2589 goto done; 2590 } 2591 if (guest && noguestmod) { 2592 reply(550, "Operation not permitted."); 2593 return; 2594 } 2595 if (unlink(name) < 0) { 2596 perror_reply(550, name); 2597 return; 2598 } 2599 done: 2600 ack("DELE"); 2601 } 2602 2603 void 2604 cwd(char *path) 2605 { 2606 2607 if (chdir(path) < 0) 2608 perror_reply(550, path); 2609 else 2610 ack("CWD"); 2611 } 2612 2613 void 2614 makedir(char *name) 2615 { 2616 char *s; 2617 2618 LOGCMD("mkdir", name); 2619 if (guest && noguestmkd) 2620 reply(550, "Operation not permitted."); 2621 else if (mkdir(name, 0777) < 0) 2622 perror_reply(550, name); 2623 else { 2624 if ((s = doublequote(name)) == NULL) 2625 fatalerror("Ran out of memory."); 2626 reply(257, "\"%s\" directory created.", s); 2627 free(s); 2628 } 2629 } 2630 2631 void 2632 removedir(char *name) 2633 { 2634 2635 LOGCMD("rmdir", name); 2636 if (rmdir(name) < 0) 2637 perror_reply(550, name); 2638 else 2639 ack("RMD"); 2640 } 2641 2642 void 2643 pwd(void) 2644 { 2645 char *s, path[MAXPATHLEN + 1]; 2646 2647 if (getcwd(path, sizeof(path)) == NULL) 2648 perror_reply(550, "Get current directory"); 2649 else { 2650 if ((s = doublequote(path)) == NULL) 2651 fatalerror("Ran out of memory."); 2652 reply(257, "\"%s\" is current directory.", s); 2653 free(s); 2654 } 2655 } 2656 2657 char * 2658 renamefrom(char *name) 2659 { 2660 struct stat st; 2661 2662 if (guest && noguestmod) { 2663 reply(550, "Operation not permitted."); 2664 return (NULL); 2665 } 2666 if (lstat(name, &st) < 0) { 2667 perror_reply(550, name); 2668 return (NULL); 2669 } 2670 reply(350, "File exists, ready for destination name."); 2671 return (name); 2672 } 2673 2674 void 2675 renamecmd(char *from, char *to) 2676 { 2677 struct stat st; 2678 2679 LOGCMD2("rename", from, to); 2680 2681 if (guest && (stat(to, &st) == 0)) { 2682 reply(550, "%s: permission denied.", to); 2683 return; 2684 } 2685 2686 if (rename(from, to) < 0) 2687 perror_reply(550, "rename"); 2688 else 2689 ack("RNTO"); 2690 } 2691 2692 static void 2693 dolog(struct sockaddr *who) 2694 { 2695 char who_name[NI_MAXHOST]; 2696 2697 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2698 remotehost[sizeof(remotehost) - 1] = 0; 2699 if (getnameinfo(who, who->sa_len, 2700 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2701 *who_name = 0; 2702 who_name[sizeof(who_name) - 1] = 0; 2703 2704 #ifdef SETPROCTITLE 2705 #ifdef VIRTUAL_HOSTING 2706 if (thishost != firsthost) 2707 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2708 remotehost, hostname); 2709 else 2710 #endif 2711 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2712 remotehost); 2713 setproctitle("%s", proctitle); 2714 #endif /* SETPROCTITLE */ 2715 2716 if (logging) { 2717 #ifdef VIRTUAL_HOSTING 2718 if (thishost != firsthost) 2719 syslog(LOG_INFO, "connection from %s (%s) to %s", 2720 remotehost, who_name, hostname); 2721 else 2722 #endif 2723 syslog(LOG_INFO, "connection from %s (%s)", 2724 remotehost, who_name); 2725 } 2726 } 2727 2728 /* 2729 * Record logout in wtmp file 2730 * and exit with supplied status. 2731 */ 2732 void 2733 dologout(int status) 2734 { 2735 2736 if (logged_in && dowtmp) { 2737 (void) seteuid(0); 2738 ftpd_logwtmp(wtmpid, NULL, NULL); 2739 } 2740 /* beware of flushing buffers after a SIGPIPE */ 2741 _exit(status); 2742 } 2743 2744 static void 2745 sigurg(int signo) 2746 { 2747 2748 recvurg = 1; 2749 } 2750 2751 static void 2752 maskurg(int flag) 2753 { 2754 int oerrno; 2755 sigset_t sset; 2756 2757 if (!transflag) { 2758 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2759 return; 2760 } 2761 oerrno = errno; 2762 sigemptyset(&sset); 2763 sigaddset(&sset, SIGURG); 2764 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2765 errno = oerrno; 2766 } 2767 2768 static void 2769 flagxfer(int flag) 2770 { 2771 2772 if (flag) { 2773 if (transflag) 2774 syslog(LOG_ERR, "Internal: flagxfer(1): " 2775 "transfer already under way"); 2776 transflag = 1; 2777 maskurg(0); 2778 recvurg = 0; 2779 } else { 2780 if (!transflag) 2781 syslog(LOG_ERR, "Internal: flagxfer(0): " 2782 "no active transfer"); 2783 maskurg(1); 2784 transflag = 0; 2785 } 2786 } 2787 2788 /* 2789 * Returns 0 if OK to resume or -1 if abort requested. 2790 */ 2791 static int 2792 myoob(void) 2793 { 2794 char *cp; 2795 int ret; 2796 2797 if (!transflag) { 2798 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2799 return (0); 2800 } 2801 cp = tmpline; 2802 ret = getline(cp, 7, stdin); 2803 if (ret == -1) { 2804 reply(221, "You could at least say goodbye."); 2805 dologout(0); 2806 } else if (ret == -2) { 2807 /* Ignore truncated command. */ 2808 return (0); 2809 } 2810 upper(cp); 2811 if (strcmp(cp, "ABOR\r\n") == 0) { 2812 tmpline[0] = '\0'; 2813 reply(426, "Transfer aborted. Data connection closed."); 2814 reply(226, "Abort successful."); 2815 return (-1); 2816 } 2817 if (strcmp(cp, "STAT\r\n") == 0) { 2818 tmpline[0] = '\0'; 2819 if (file_size != -1) 2820 reply(213, "Status: %jd of %jd bytes transferred.", 2821 (intmax_t)byte_count, (intmax_t)file_size); 2822 else 2823 reply(213, "Status: %jd bytes transferred.", 2824 (intmax_t)byte_count); 2825 } 2826 return (0); 2827 } 2828 2829 /* 2830 * Note: a response of 425 is not mentioned as a possible response to 2831 * the PASV command in RFC959. However, it has been blessed as 2832 * a legitimate response by Jon Postel in a telephone conversation 2833 * with Rick Adams on 25 Jan 89. 2834 */ 2835 void 2836 passive(void) 2837 { 2838 socklen_t len; 2839 int on; 2840 char *p, *a; 2841 2842 if (pdata >= 0) /* close old port if one set */ 2843 close(pdata); 2844 2845 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2846 if (pdata < 0) { 2847 perror_reply(425, "Can't open passive connection"); 2848 return; 2849 } 2850 on = 1; 2851 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2852 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2853 2854 (void) seteuid(0); 2855 2856 #ifdef IP_PORTRANGE 2857 if (ctrl_addr.su_family == AF_INET) { 2858 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2859 : IP_PORTRANGE_DEFAULT; 2860 2861 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2862 &on, sizeof(on)) < 0) 2863 goto pasv_error; 2864 } 2865 #endif 2866 #ifdef IPV6_PORTRANGE 2867 if (ctrl_addr.su_family == AF_INET6) { 2868 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2869 : IPV6_PORTRANGE_DEFAULT; 2870 2871 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2872 &on, sizeof(on)) < 0) 2873 goto pasv_error; 2874 } 2875 #endif 2876 2877 pasv_addr = ctrl_addr; 2878 pasv_addr.su_port = 0; 2879 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2880 goto pasv_error; 2881 2882 (void) seteuid(pw->pw_uid); 2883 2884 len = sizeof(pasv_addr); 2885 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2886 goto pasv_error; 2887 if (listen(pdata, 1) < 0) 2888 goto pasv_error; 2889 if (pasv_addr.su_family == AF_INET) 2890 a = (char *) &pasv_addr.su_sin.sin_addr; 2891 else if (pasv_addr.su_family == AF_INET6 && 2892 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2893 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2894 else 2895 goto pasv_error; 2896 2897 p = (char *) &pasv_addr.su_port; 2898 2899 #define UC(b) (((int) b) & 0xff) 2900 2901 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2902 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2903 return; 2904 2905 pasv_error: 2906 (void) seteuid(pw->pw_uid); 2907 (void) close(pdata); 2908 pdata = -1; 2909 perror_reply(425, "Can't open passive connection"); 2910 return; 2911 } 2912 2913 /* 2914 * Long Passive defined in RFC 1639. 2915 * 228 Entering Long Passive Mode 2916 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2917 */ 2918 2919 void 2920 long_passive(char *cmd, int pf) 2921 { 2922 socklen_t len; 2923 int on; 2924 char *p, *a; 2925 2926 if (pdata >= 0) /* close old port if one set */ 2927 close(pdata); 2928 2929 if (pf != PF_UNSPEC) { 2930 if (ctrl_addr.su_family != pf) { 2931 switch (ctrl_addr.su_family) { 2932 case AF_INET: 2933 pf = 1; 2934 break; 2935 case AF_INET6: 2936 pf = 2; 2937 break; 2938 default: 2939 pf = 0; 2940 break; 2941 } 2942 /* 2943 * XXX 2944 * only EPRT/EPSV ready clients will understand this 2945 */ 2946 if (strcmp(cmd, "EPSV") == 0 && pf) { 2947 reply(522, "Network protocol mismatch, " 2948 "use (%d)", pf); 2949 } else 2950 reply(501, "Network protocol mismatch."); /*XXX*/ 2951 2952 return; 2953 } 2954 } 2955 2956 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2957 if (pdata < 0) { 2958 perror_reply(425, "Can't open passive connection"); 2959 return; 2960 } 2961 on = 1; 2962 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2963 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2964 2965 (void) seteuid(0); 2966 2967 pasv_addr = ctrl_addr; 2968 pasv_addr.su_port = 0; 2969 len = pasv_addr.su_len; 2970 2971 #ifdef IP_PORTRANGE 2972 if (ctrl_addr.su_family == AF_INET) { 2973 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2974 : IP_PORTRANGE_DEFAULT; 2975 2976 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2977 &on, sizeof(on)) < 0) 2978 goto pasv_error; 2979 } 2980 #endif 2981 #ifdef IPV6_PORTRANGE 2982 if (ctrl_addr.su_family == AF_INET6) { 2983 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2984 : IPV6_PORTRANGE_DEFAULT; 2985 2986 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2987 &on, sizeof(on)) < 0) 2988 goto pasv_error; 2989 } 2990 #endif 2991 2992 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2993 goto pasv_error; 2994 2995 (void) seteuid(pw->pw_uid); 2996 2997 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2998 goto pasv_error; 2999 if (listen(pdata, 1) < 0) 3000 goto pasv_error; 3001 3002 #define UC(b) (((int) b) & 0xff) 3003 3004 if (strcmp(cmd, "LPSV") == 0) { 3005 p = (char *)&pasv_addr.su_port; 3006 switch (pasv_addr.su_family) { 3007 case AF_INET: 3008 a = (char *) &pasv_addr.su_sin.sin_addr; 3009 v4_reply: 3010 reply(228, 3011 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3012 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3013 2, UC(p[0]), UC(p[1])); 3014 return; 3015 case AF_INET6: 3016 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3017 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3018 goto v4_reply; 3019 } 3020 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3021 reply(228, 3022 "Entering Long Passive Mode " 3023 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3024 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3025 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3026 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3027 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3028 2, UC(p[0]), UC(p[1])); 3029 return; 3030 } 3031 } else if (strcmp(cmd, "EPSV") == 0) { 3032 switch (pasv_addr.su_family) { 3033 case AF_INET: 3034 case AF_INET6: 3035 reply(229, "Entering Extended Passive Mode (|||%d|)", 3036 ntohs(pasv_addr.su_port)); 3037 return; 3038 } 3039 } else { 3040 /* more proper error code? */ 3041 } 3042 3043 pasv_error: 3044 (void) seteuid(pw->pw_uid); 3045 (void) close(pdata); 3046 pdata = -1; 3047 perror_reply(425, "Can't open passive connection"); 3048 return; 3049 } 3050 3051 /* 3052 * Generate unique name for file with basename "local" 3053 * and open the file in order to avoid possible races. 3054 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3055 * Return descriptor to the file, set "name" to its name. 3056 * 3057 * Generates failure reply on error. 3058 */ 3059 static int 3060 guniquefd(char *local, char **name) 3061 { 3062 static char new[MAXPATHLEN]; 3063 struct stat st; 3064 char *cp; 3065 int count; 3066 int fd; 3067 3068 cp = strrchr(local, '/'); 3069 if (cp) 3070 *cp = '\0'; 3071 if (stat(cp ? local : ".", &st) < 0) { 3072 perror_reply(553, cp ? local : "."); 3073 return (-1); 3074 } 3075 if (cp) { 3076 /* 3077 * Let not overwrite dirname with counter suffix. 3078 * -4 is for /nn\0 3079 * In this extreme case dot won't be put in front of suffix. 3080 */ 3081 if (strlen(local) > sizeof(new) - 4) { 3082 reply(553, "Pathname too long."); 3083 return (-1); 3084 } 3085 *cp = '/'; 3086 } 3087 /* -4 is for the .nn<null> we put on the end below */ 3088 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3089 cp = new + strlen(new); 3090 /* 3091 * Don't generate dotfile unless requested explicitly. 3092 * This covers the case when basename gets truncated off 3093 * by buffer size. 3094 */ 3095 if (cp > new && cp[-1] != '/') 3096 *cp++ = '.'; 3097 for (count = 0; count < 100; count++) { 3098 /* At count 0 try unmodified name */ 3099 if (count) 3100 (void)sprintf(cp, "%d", count); 3101 if ((fd = open(count ? new : local, 3102 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3103 *name = count ? new : local; 3104 return (fd); 3105 } 3106 if (errno != EEXIST) { 3107 perror_reply(553, count ? new : local); 3108 return (-1); 3109 } 3110 } 3111 reply(452, "Unique file name cannot be created."); 3112 return (-1); 3113 } 3114 3115 /* 3116 * Format and send reply containing system error number. 3117 */ 3118 void 3119 perror_reply(int code, char *string) 3120 { 3121 3122 reply(code, "%s: %s.", string, strerror(errno)); 3123 } 3124 3125 static char *onefile[] = { 3126 "", 3127 0 3128 }; 3129 3130 void 3131 send_file_list(char *whichf) 3132 { 3133 struct stat st; 3134 DIR *dirp = NULL; 3135 struct dirent *dir; 3136 FILE *dout = NULL; 3137 char **dirlist, *dirname; 3138 int simple = 0; 3139 int freeglob = 0; 3140 glob_t gl; 3141 3142 if (strpbrk(whichf, "~{[*?") != NULL) { 3143 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3144 3145 memset(&gl, 0, sizeof(gl)); 3146 gl.gl_matchc = MAXGLOBARGS; 3147 flags |= GLOB_LIMIT; 3148 freeglob = 1; 3149 if (glob(whichf, flags, 0, &gl)) { 3150 reply(550, "No matching files found."); 3151 goto out; 3152 } else if (gl.gl_pathc == 0) { 3153 errno = ENOENT; 3154 perror_reply(550, whichf); 3155 goto out; 3156 } 3157 dirlist = gl.gl_pathv; 3158 } else { 3159 onefile[0] = whichf; 3160 dirlist = onefile; 3161 simple = 1; 3162 } 3163 3164 while ((dirname = *dirlist++)) { 3165 if (stat(dirname, &st) < 0) { 3166 /* 3167 * If user typed "ls -l", etc, and the client 3168 * used NLST, do what the user meant. 3169 */ 3170 if (dirname[0] == '-' && *dirlist == NULL && 3171 dout == NULL) 3172 retrieve(_PATH_LS " %s", dirname); 3173 else 3174 perror_reply(550, whichf); 3175 goto out; 3176 } 3177 3178 if (S_ISREG(st.st_mode)) { 3179 if (dout == NULL) { 3180 dout = dataconn("file list", -1, "w"); 3181 if (dout == NULL) 3182 goto out; 3183 STARTXFER; 3184 } 3185 START_UNSAFE; 3186 fprintf(dout, "%s%s\n", dirname, 3187 type == TYPE_A ? "\r" : ""); 3188 END_UNSAFE; 3189 if (ferror(dout)) 3190 goto data_err; 3191 byte_count += strlen(dirname) + 3192 (type == TYPE_A ? 2 : 1); 3193 CHECKOOB(goto abrt); 3194 continue; 3195 } else if (!S_ISDIR(st.st_mode)) 3196 continue; 3197 3198 if ((dirp = opendir(dirname)) == NULL) 3199 continue; 3200 3201 while ((dir = readdir(dirp)) != NULL) { 3202 char nbuf[MAXPATHLEN]; 3203 3204 CHECKOOB(goto abrt); 3205 3206 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3207 continue; 3208 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3209 dir->d_namlen == 2) 3210 continue; 3211 3212 snprintf(nbuf, sizeof(nbuf), 3213 "%s/%s", dirname, dir->d_name); 3214 3215 /* 3216 * We have to do a stat to insure it's 3217 * not a directory or special file. 3218 */ 3219 if (simple || (stat(nbuf, &st) == 0 && 3220 S_ISREG(st.st_mode))) { 3221 if (dout == NULL) { 3222 dout = dataconn("file list", -1, "w"); 3223 if (dout == NULL) 3224 goto out; 3225 STARTXFER; 3226 } 3227 START_UNSAFE; 3228 if (nbuf[0] == '.' && nbuf[1] == '/') 3229 fprintf(dout, "%s%s\n", &nbuf[2], 3230 type == TYPE_A ? "\r" : ""); 3231 else 3232 fprintf(dout, "%s%s\n", nbuf, 3233 type == TYPE_A ? "\r" : ""); 3234 END_UNSAFE; 3235 if (ferror(dout)) 3236 goto data_err; 3237 byte_count += strlen(nbuf) + 3238 (type == TYPE_A ? 2 : 1); 3239 CHECKOOB(goto abrt); 3240 } 3241 } 3242 (void) closedir(dirp); 3243 dirp = NULL; 3244 } 3245 3246 if (dout == NULL) 3247 reply(550, "No files found."); 3248 else if (ferror(dout)) 3249 data_err: perror_reply(550, "Data connection"); 3250 else 3251 reply(226, "Transfer complete."); 3252 out: 3253 if (dout) { 3254 ENDXFER; 3255 abrt: 3256 (void) fclose(dout); 3257 data = -1; 3258 pdata = -1; 3259 } 3260 if (dirp) 3261 (void) closedir(dirp); 3262 if (freeglob) { 3263 freeglob = 0; 3264 globfree(&gl); 3265 } 3266 } 3267 3268 void 3269 reapchild(int signo) 3270 { 3271 while (waitpid(-1, NULL, WNOHANG) > 0); 3272 } 3273 3274 #ifdef OLD_SETPROCTITLE 3275 /* 3276 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3277 * Warning, since this is usually started from inetd.conf, it often doesn't 3278 * have much of an environment or arglist to overwrite. 3279 */ 3280 void 3281 setproctitle(const char *fmt, ...) 3282 { 3283 int i; 3284 va_list ap; 3285 char *p, *bp, ch; 3286 char buf[LINE_MAX]; 3287 3288 va_start(ap, fmt); 3289 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3290 3291 /* make ps print our process name */ 3292 p = Argv[0]; 3293 *p++ = '-'; 3294 3295 i = strlen(buf); 3296 if (i > LastArgv - p - 2) { 3297 i = LastArgv - p - 2; 3298 buf[i] = '\0'; 3299 } 3300 bp = buf; 3301 while (ch = *bp++) 3302 if (ch != '\n' && ch != '\r') 3303 *p++ = ch; 3304 while (p < LastArgv) 3305 *p++ = ' '; 3306 } 3307 #endif /* OLD_SETPROCTITLE */ 3308 3309 static void 3310 appendf(char **strp, char *fmt, ...) 3311 { 3312 va_list ap; 3313 char *ostr, *p; 3314 3315 va_start(ap, fmt); 3316 vasprintf(&p, fmt, ap); 3317 va_end(ap); 3318 if (p == NULL) 3319 fatalerror("Ran out of memory."); 3320 if (*strp == NULL) 3321 *strp = p; 3322 else { 3323 ostr = *strp; 3324 asprintf(strp, "%s%s", ostr, p); 3325 if (*strp == NULL) 3326 fatalerror("Ran out of memory."); 3327 free(ostr); 3328 } 3329 } 3330 3331 static void 3332 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3333 { 3334 char *msg = NULL; 3335 char wd[MAXPATHLEN + 1]; 3336 3337 if (logging <= 1) 3338 return; 3339 3340 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3341 strcpy(wd, strerror(errno)); 3342 3343 appendf(&msg, "%s", cmd); 3344 if (file1) 3345 appendf(&msg, " %s", file1); 3346 if (file2) 3347 appendf(&msg, " %s", file2); 3348 if (cnt >= 0) 3349 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3350 appendf(&msg, " (wd: %s", wd); 3351 if (guest || dochroot) 3352 appendf(&msg, "; chrooted"); 3353 appendf(&msg, ")"); 3354 syslog(LOG_INFO, "%s", msg); 3355 free(msg); 3356 } 3357 3358 static void 3359 logxfer(char *name, off_t size, time_t start) 3360 { 3361 char buf[MAXPATHLEN + 1024]; 3362 char path[MAXPATHLEN + 1]; 3363 time_t now; 3364 3365 if (statfd >= 0) { 3366 time(&now); 3367 if (realpath(name, path) == NULL) { 3368 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3369 return; 3370 } 3371 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3372 ctime(&now)+4, ident, remotehost, 3373 path, (intmax_t)size, 3374 (long)(now - start + (now == start))); 3375 write(statfd, buf, strlen(buf)); 3376 } 3377 } 3378 3379 static char * 3380 doublequote(char *s) 3381 { 3382 int n; 3383 char *p, *s2; 3384 3385 for (p = s, n = 0; *p; p++) 3386 if (*p == '"') 3387 n++; 3388 3389 if ((s2 = malloc(p - s + n + 1)) == NULL) 3390 return (NULL); 3391 3392 for (p = s2; *s; s++, p++) { 3393 if ((*p = *s) == '"') 3394 *(++p) = '"'; 3395 } 3396 *p = '\0'; 3397 3398 return (s2); 3399 } 3400 3401 /* setup server socket for specified address family */ 3402 /* if af is PF_UNSPEC more than one socket may be returned */ 3403 /* the returned list is dynamically allocated, so caller needs to free it */ 3404 static int * 3405 socksetup(int af, char *bindname, const char *bindport) 3406 { 3407 struct addrinfo hints, *res, *r; 3408 int error, maxs, *s, *socks; 3409 const int on = 1; 3410 3411 memset(&hints, 0, sizeof(hints)); 3412 hints.ai_flags = AI_PASSIVE; 3413 hints.ai_family = af; 3414 hints.ai_socktype = SOCK_STREAM; 3415 error = getaddrinfo(bindname, bindport, &hints, &res); 3416 if (error) { 3417 syslog(LOG_ERR, "%s", gai_strerror(error)); 3418 if (error == EAI_SYSTEM) 3419 syslog(LOG_ERR, "%s", strerror(errno)); 3420 return NULL; 3421 } 3422 3423 /* Count max number of sockets we may open */ 3424 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3425 ; 3426 socks = malloc((maxs + 1) * sizeof(int)); 3427 if (!socks) { 3428 freeaddrinfo(res); 3429 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3430 return NULL; 3431 } 3432 3433 *socks = 0; /* num of sockets counter at start of array */ 3434 s = socks + 1; 3435 for (r = res; r; r = r->ai_next) { 3436 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3437 if (*s < 0) { 3438 syslog(LOG_DEBUG, "control socket: %m"); 3439 continue; 3440 } 3441 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3442 &on, sizeof(on)) < 0) 3443 syslog(LOG_WARNING, 3444 "control setsockopt (SO_REUSEADDR): %m"); 3445 if (r->ai_family == AF_INET6) { 3446 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3447 &on, sizeof(on)) < 0) 3448 syslog(LOG_WARNING, 3449 "control setsockopt (IPV6_V6ONLY): %m"); 3450 } 3451 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3452 syslog(LOG_DEBUG, "control bind: %m"); 3453 close(*s); 3454 continue; 3455 } 3456 (*socks)++; 3457 s++; 3458 } 3459 3460 if (res) 3461 freeaddrinfo(res); 3462 3463 if (*socks == 0) { 3464 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3465 free(socks); 3466 return NULL; 3467 } 3468 return(socks); 3469 } 3470