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 * @(#)ftpd.c 8.4 (Berkeley) 4/16/94 34 * $FreeBSD: src/libexec/ftpd/ftpd.c,v 1.213 2008/12/23 01:23:09 cperciva Exp $ 35 * $DragonFly: src/libexec/ftpd/ftpd.c,v 1.7 2005/10/28 18:06:57 joerg Exp $ 36 */ 37 38 /* 39 * FTP server. 40 */ 41 #include <sys/param.h> 42 #include <sys/ioctl.h> 43 #include <sys/mman.h> 44 #include <sys/socket.h> 45 #include <sys/stat.h> 46 #include <sys/time.h> 47 #include <sys/wait.h> 48 49 #include <netinet/in.h> 50 #include <netinet/in_systm.h> 51 #include <netinet/ip.h> 52 #include <netinet/tcp.h> 53 54 #define FTP_NAMES 55 #include <arpa/ftp.h> 56 #include <arpa/inet.h> 57 #include <arpa/telnet.h> 58 59 #include <ctype.h> 60 #include <dirent.h> 61 #include <err.h> 62 #include <errno.h> 63 #include <fcntl.h> 64 #include <glob.h> 65 #include <limits.h> 66 #include <netdb.h> 67 #include <pwd.h> 68 #include <grp.h> 69 #include <opie.h> 70 #include <signal.h> 71 #include <stdint.h> 72 #include <stdio.h> 73 #include <stdlib.h> 74 #include <string.h> 75 #include <syslog.h> 76 #include <time.h> 77 #include <unistd.h> 78 #include <libutil.h> 79 #ifdef LOGIN_CAP 80 #include <login_cap.h> 81 #endif 82 83 #ifdef USE_PAM 84 #include <security/pam_appl.h> 85 #endif 86 87 #include "pathnames.h" 88 #include "extern.h" 89 #include "pidfile.h" 90 91 #include <stdarg.h> 92 93 static char version[] = "Version 6.00LS"; 94 #undef main 95 96 extern off_t restart_point; 97 extern char cbuf[]; 98 99 union sockunion ctrl_addr; 100 union sockunion data_source; 101 union sockunion data_dest; 102 union sockunion his_addr; 103 union sockunion pasv_addr; 104 105 int daemon_mode; 106 int data; 107 int dataport; 108 int hostinfo = 1; /* print host-specific info in messages */ 109 int logged_in; 110 struct passwd *pw; 111 char *homedir; 112 int ftpdebug; 113 int timeout = 900; /* timeout after 15 minutes of inactivity */ 114 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 115 int logging; 116 int restricted_data_ports = 1; 117 int paranoid = 1; /* be extra careful about security */ 118 int anon_only = 0; /* Only anonymous ftp allowed */ 119 int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 120 int guest; 121 int dochroot; 122 char *chrootdir; 123 int dowtmp = 1; 124 int stats; 125 int statfd = -1; 126 int type; 127 int form; 128 int stru; /* avoid C keyword */ 129 int mode; 130 int usedefault = 1; /* for data transfers */ 131 int pdata = -1; /* for passive mode */ 132 int readonly = 0; /* Server is in readonly mode. */ 133 int noepsv = 0; /* EPSV command is disabled. */ 134 int noretr = 0; /* RETR command is disabled. */ 135 int noguestretr = 0; /* RETR command is disabled for anon users. */ 136 int noguestmkd = 0; /* MKD command is disabled for anon users. */ 137 int noguestmod = 1; /* anon users may not modify existing files. */ 138 139 off_t file_size; 140 off_t byte_count; 141 #if !defined(CMASK) || CMASK == 0 142 #undef CMASK 143 #define CMASK 027 144 #endif 145 int defumask = CMASK; /* default umask value */ 146 char tmpline[7]; 147 char *hostname; 148 int epsvall = 0; 149 150 #ifdef VIRTUAL_HOSTING 151 char *ftpuser; 152 153 static struct ftphost { 154 struct ftphost *next; 155 struct addrinfo *hostinfo; 156 char *hostname; 157 char *anonuser; 158 char *statfile; 159 char *welcome; 160 char *loginmsg; 161 } *thishost, *firsthost; 162 163 #endif 164 char remotehost[NI_MAXHOST]; 165 char *ident = NULL; 166 167 static char ttyline[20]; 168 char *tty = ttyline; /* for klogin */ 169 170 #ifdef USE_PAM 171 static int auth_pam(struct passwd**, const char*); 172 pam_handle_t *pamh = NULL; 173 #endif 174 175 static struct opie opiedata; 176 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 177 static int pwok; 178 179 char *pid_file = NULL; /* means default location to pidfile(3) */ 180 181 /* 182 * Limit number of pathnames that glob can return. 183 * A limit of 0 indicates the number of pathnames is unlimited. 184 */ 185 #define MAXGLOBARGS 16384 186 # 187 188 /* 189 * Timeout intervals for retrying connections 190 * to hosts that don't accept PORT cmds. This 191 * is a kludge, but given the problems with TCP... 192 */ 193 #define SWAITMAX 90 /* wait at most 90 seconds */ 194 #define SWAITINT 5 /* interval between retries */ 195 196 int swaitmax = SWAITMAX; 197 int swaitint = SWAITINT; 198 199 #ifdef SETPROCTITLE 200 #ifdef OLD_SETPROCTITLE 201 char **Argv = NULL; /* pointer to argument vector */ 202 char *LastArgv = NULL; /* end of argv */ 203 #endif /* OLD_SETPROCTITLE */ 204 char proctitle[LINE_MAX]; /* initial part of title */ 205 #endif /* SETPROCTITLE */ 206 207 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 208 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 209 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 210 211 static volatile sig_atomic_t recvurg; 212 static int transflag; /* NB: for debugging only */ 213 214 #define STARTXFER flagxfer(1) 215 #define ENDXFER flagxfer(0) 216 217 #define START_UNSAFE maskurg(1) 218 #define END_UNSAFE maskurg(0) 219 220 /* It's OK to put an `else' clause after this macro. */ 221 #define CHECKOOB(action) \ 222 if (recvurg) { \ 223 recvurg = 0; \ 224 if (myoob()) { \ 225 ENDXFER; \ 226 action; \ 227 } \ 228 } 229 230 #ifdef VIRTUAL_HOSTING 231 static void inithosts(int); 232 static void selecthost(union sockunion *); 233 #endif 234 static void ack(char *); 235 static void sigurg(int); 236 static void maskurg(int); 237 static void flagxfer(int); 238 static int myoob(void); 239 static int checkuser(char *, char *, int, char **); 240 static FILE *dataconn(char *, off_t, char *); 241 static void dolog(struct sockaddr *); 242 static void end_login(void); 243 static FILE *getdatasock(char *); 244 static int guniquefd(char *, char **); 245 static void lostconn(int); 246 static void sigquit(int); 247 static int receive_data(FILE *, FILE *); 248 static int send_data(FILE *, FILE *, size_t, off_t, int); 249 static struct passwd * 250 sgetpwnam(char *); 251 static char *sgetsave(char *); 252 static void reapchild(int); 253 static void appendf(char **, char *, ...) __printflike(2, 3); 254 static void logcmd(char *, char *, char *, off_t); 255 static void logxfer(char *, off_t, time_t); 256 static char *doublequote(char *); 257 static int *socksetup(int, char *, const char *); 258 259 int 260 main(int argc, char *argv[], char **envp) 261 { 262 socklen_t addrlen; 263 int ch, on = 1, tos; 264 char *cp, line[LINE_MAX]; 265 FILE *fd; 266 char *bindname = NULL; 267 const char *bindport = "ftp"; 268 int family = AF_UNSPEC; 269 struct sigaction sa; 270 271 tzset(); /* in case no timezone database in ~ftp */ 272 sigemptyset(&sa.sa_mask); 273 sa.sa_flags = SA_RESTART; 274 275 #ifdef OLD_SETPROCTITLE 276 /* 277 * Save start and extent of argv for setproctitle. 278 */ 279 Argv = argv; 280 while (*envp) 281 envp++; 282 LastArgv = envp[-1] + strlen(envp[-1]); 283 #endif /* OLD_SETPROCTITLE */ 284 285 /* 286 * Prevent diagnostic messages from appearing on stderr. 287 * We run as a daemon or from inetd; in both cases, there's 288 * more reason in logging to syslog. 289 */ 290 freopen(_PATH_DEVNULL, "w", stderr); 291 opterr = 0; 292 293 /* 294 * LOG_NDELAY sets up the logging connection immediately, 295 * necessary for anonymous ftp's that chroot and can't do it later. 296 */ 297 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 298 299 while ((ch = getopt(argc, argv, 300 "468a:AdDEH:hlmMoOp:P:rRSt:T:u:UvW")) != -1) { 301 switch (ch) { 302 case '4': 303 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 304 break; 305 306 case '6': 307 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 308 break; 309 310 case '8': 311 assumeutf8 = 1; 312 break; 313 314 case 'a': 315 bindname = optarg; 316 break; 317 318 case 'A': 319 anon_only = 1; 320 break; 321 322 case 'd': 323 ftpdebug++; 324 break; 325 326 case 'D': 327 daemon_mode++; 328 break; 329 330 case 'E': 331 noepsv = 1; 332 break; 333 334 case 'h': 335 hostinfo = 0; 336 break; 337 338 case 'H': 339 hostname = optarg; 340 break; 341 342 case 'l': 343 logging++; /* > 1 == extra logging */ 344 break; 345 346 case 'm': 347 noguestmod = 0; 348 break; 349 350 case 'M': 351 noguestmkd = 1; 352 break; 353 354 case 'o': 355 noretr = 1; 356 break; 357 358 case 'O': 359 noguestretr = 1; 360 break; 361 362 case 'p': 363 pid_file = optarg; 364 break; 365 366 case 'P': 367 bindport = optarg; 368 break; 369 370 case 'r': 371 readonly = 1; 372 break; 373 374 case 'R': 375 paranoid = 0; 376 break; 377 378 case 'S': 379 stats++; 380 break; 381 382 case 't': 383 timeout = atoi(optarg); 384 if (maxtimeout < timeout) 385 maxtimeout = timeout; 386 break; 387 388 case 'T': 389 maxtimeout = atoi(optarg); 390 if (timeout > maxtimeout) 391 timeout = maxtimeout; 392 break; 393 394 case 'u': 395 { 396 long val = 0; 397 398 val = strtol(optarg, &optarg, 8); 399 if (*optarg != '\0' || val < 0) 400 syslog(LOG_WARNING, "bad value for -u"); 401 else 402 defumask = val; 403 break; 404 } 405 case 'U': 406 restricted_data_ports = 0; 407 break; 408 409 case 'v': 410 ftpdebug++; 411 break; 412 413 case 'W': 414 dowtmp = 0; 415 break; 416 417 default: 418 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 419 break; 420 } 421 } 422 423 if (daemon_mode) { 424 int *ctl_sock, fd, maxfd = -1, nfds, i; 425 fd_set defreadfds, readfds; 426 pid_t pid; 427 struct pidfh *pfh; 428 429 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) { 430 if (errno == EEXIST) { 431 syslog(LOG_ERR, "%s already running, pid %d", 432 getprogname(), (int)pid); 433 exit(1); 434 } 435 syslog(LOG_WARNING, "pidfile_open: %m"); 436 } 437 438 /* 439 * Detach from parent. 440 */ 441 if (daemon(1, 1) < 0) { 442 syslog(LOG_ERR, "failed to become a daemon"); 443 exit(1); 444 } 445 446 if (pfh != NULL && pidfile_write(pfh) == -1) 447 syslog(LOG_WARNING, "pidfile_write: %m"); 448 449 sa.sa_handler = reapchild; 450 sigaction(SIGCHLD, &sa, NULL); 451 452 #ifdef VIRTUAL_HOSTING 453 inithosts(family); 454 #endif 455 456 /* 457 * Open a socket, bind it to the FTP port, and start 458 * listening. 459 */ 460 ctl_sock = socksetup(family, bindname, bindport); 461 if (ctl_sock == NULL) 462 exit(1); 463 464 FD_ZERO(&defreadfds); 465 for (i = 1; i <= *ctl_sock; i++) { 466 FD_SET(ctl_sock[i], &defreadfds); 467 if (listen(ctl_sock[i], 32) < 0) { 468 syslog(LOG_ERR, "control listen: %m"); 469 exit(1); 470 } 471 if (maxfd < ctl_sock[i]) 472 maxfd = ctl_sock[i]; 473 } 474 475 /* 476 * Loop forever accepting connection requests and forking off 477 * children to handle them. 478 */ 479 while (1) { 480 FD_COPY(&defreadfds, &readfds); 481 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 482 if (nfds <= 0) { 483 if (nfds < 0 && errno != EINTR) 484 syslog(LOG_WARNING, "select: %m"); 485 continue; 486 } 487 488 pid = -1; 489 for (i = 1; i <= *ctl_sock; i++) 490 if (FD_ISSET(ctl_sock[i], &readfds)) { 491 addrlen = sizeof(his_addr); 492 fd = accept(ctl_sock[i], 493 (struct sockaddr *)&his_addr, 494 &addrlen); 495 if (fd == -1) { 496 syslog(LOG_WARNING, 497 "accept: %m"); 498 continue; 499 } 500 switch (pid = fork()) { 501 case 0: 502 /* child */ 503 dup2(fd, 0); 504 dup2(fd, 1); 505 close(fd); 506 for (i = 1; i <= *ctl_sock; i++) 507 close(ctl_sock[i]); 508 if (pfh != NULL) 509 pidfile_close(pfh); 510 goto gotchild; 511 case -1: 512 syslog(LOG_WARNING, "fork: %m"); 513 /* FALLTHROUGH */ 514 default: 515 close(fd); 516 } 517 } 518 } 519 } else { 520 addrlen = sizeof(his_addr); 521 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 522 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 523 exit(1); 524 } 525 526 #ifdef VIRTUAL_HOSTING 527 if (his_addr.su_family == AF_INET6 && 528 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 529 family = AF_INET; 530 else 531 family = his_addr.su_family; 532 inithosts(family); 533 #endif 534 } 535 536 gotchild: 537 sa.sa_handler = SIG_DFL; 538 sigaction(SIGCHLD, &sa, NULL); 539 540 sa.sa_handler = sigurg; 541 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 542 sigaction(SIGURG, &sa, NULL); 543 544 sigfillset(&sa.sa_mask); /* block all signals in handler */ 545 sa.sa_flags = SA_RESTART; 546 sa.sa_handler = sigquit; 547 sigaction(SIGHUP, &sa, NULL); 548 sigaction(SIGINT, &sa, NULL); 549 sigaction(SIGQUIT, &sa, NULL); 550 sigaction(SIGTERM, &sa, NULL); 551 552 sa.sa_handler = lostconn; 553 sigaction(SIGPIPE, &sa, NULL); 554 555 addrlen = sizeof(ctrl_addr); 556 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 557 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 558 exit(1); 559 } 560 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 561 #ifdef VIRTUAL_HOSTING 562 /* select our identity from virtual host table */ 563 selecthost(&ctrl_addr); 564 #endif 565 #ifdef IP_TOS 566 if (ctrl_addr.su_family == AF_INET) 567 { 568 tos = IPTOS_LOWDELAY; 569 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 570 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 571 } 572 #endif 573 /* 574 * Disable Nagle on the control channel so that we don't have to wait 575 * for peer's ACK before issuing our next reply. 576 */ 577 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 578 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 579 580 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 581 582 /* set this here so klogin can use it... */ 583 snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 584 585 /* Try to handle urgent data inline */ 586 #ifdef SO_OOBINLINE 587 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 588 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 589 #endif 590 591 #ifdef F_SETOWN 592 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 593 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 594 #endif 595 dolog((struct sockaddr *)&his_addr); 596 /* 597 * Set up default state 598 */ 599 data = -1; 600 type = TYPE_A; 601 form = FORM_N; 602 stru = STRU_F; 603 mode = MODE_S; 604 tmpline[0] = '\0'; 605 606 /* If logins are disabled, print out the message. */ 607 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 608 while (fgets(line, sizeof(line), fd) != NULL) { 609 if ((cp = strchr(line, '\n')) != NULL) 610 *cp = '\0'; 611 lreply(530, "%s", line); 612 } 613 fflush(stdout); 614 fclose(fd); 615 reply(530, "System not available."); 616 exit(0); 617 } 618 #ifdef VIRTUAL_HOSTING 619 fd = fopen(thishost->welcome, "r"); 620 #else 621 fd = fopen(_PATH_FTPWELCOME, "r"); 622 #endif 623 if (fd != NULL) { 624 while (fgets(line, sizeof(line), fd) != NULL) { 625 if ((cp = strchr(line, '\n')) != NULL) 626 *cp = '\0'; 627 lreply(220, "%s", line); 628 } 629 fflush(stdout); 630 fclose(fd); 631 /* reply(220,) must follow */ 632 } 633 #ifndef VIRTUAL_HOSTING 634 if (hostname == NULL) { 635 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 636 fatalerror("Ran out of memory."); 637 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 638 hostname[0] = '\0'; 639 hostname[MAXHOSTNAMELEN - 1] = '\0'; 640 } 641 #endif 642 if (hostinfo) 643 reply(220, "%s FTP server (%s) ready.", hostname, version); 644 else 645 reply(220, "FTP server ready."); 646 for (;;) 647 yyparse(); 648 /* NOTREACHED */ 649 } 650 651 static void 652 lostconn(int signo) 653 { 654 655 if (ftpdebug) 656 syslog(LOG_DEBUG, "lost connection"); 657 dologout(1); 658 } 659 660 static void 661 sigquit(int signo) 662 { 663 664 syslog(LOG_ERR, "got signal %d", signo); 665 dologout(1); 666 } 667 668 #ifdef VIRTUAL_HOSTING 669 /* 670 * read in virtual host tables (if they exist) 671 */ 672 673 static void 674 inithosts(int family) 675 { 676 int insert; 677 size_t len; 678 FILE *fp; 679 char *cp, *mp, *line; 680 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 681 struct ftphost *hrp, *lhrp; 682 struct addrinfo hints, *res, *ai; 683 684 /* 685 * Fill in the default host information 686 */ 687 if (hostname == NULL) { 688 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 689 fatalerror("Ran out of memory."); 690 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 691 hostname[0] = '\0'; 692 hostname[MAXHOSTNAMELEN - 1] = '\0'; 693 } 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 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 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 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 seteuid(0); 1181 if (logged_in && dowtmp) 1182 ftpd_logwtmp(ttyline, "", NULL); 1183 pw = NULL; 1184 #ifdef LOGIN_CAP 1185 /* XXX Missing LOGIN_SETMAC */ 1186 setusercontext(NULL, getpwuid(0), 0, 1187 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 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 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 /* XXX Missing LOGIN_SETMAC */ 1460 setusercontext(lc, pw, 0, 1461 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1462 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1463 #else 1464 setlogin(pw->pw_name); 1465 initgroups(pw->pw_name, pw->pw_gid); 1466 #endif 1467 1468 #ifdef USE_PAM 1469 if (pamh) { 1470 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1471 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1472 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1473 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1474 } 1475 } 1476 #endif 1477 1478 /* open wtmp before chroot */ 1479 if (dowtmp) 1480 ftpd_logwtmp(ttyline, pw->pw_name, 1481 (struct sockaddr *)&his_addr); 1482 logged_in = 1; 1483 1484 if (guest && stats && statfd < 0) 1485 #ifdef VIRTUAL_HOSTING 1486 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1487 #else 1488 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1489 #endif 1490 if (statfd < 0) 1491 stats = 0; 1492 1493 dochroot = 1494 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1495 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1496 || login_getcapbool(lc, "ftp-chroot", 0) 1497 #endif 1498 ; 1499 chrootdir = NULL; 1500 /* 1501 * For a chrooted local user, 1502 * a) see whether ftpchroot(5) specifies a chroot directory, 1503 * b) extract the directory pathname from the line, 1504 * c) expand it to the absolute pathname if necessary. 1505 */ 1506 if (dochroot && residue && 1507 (chrootdir = strtok(residue, " \t")) != NULL) { 1508 if (chrootdir[0] != '/') 1509 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1510 else 1511 chrootdir = strdup(chrootdir); /* make it permanent */ 1512 if (chrootdir == NULL) 1513 fatalerror("Ran out of memory."); 1514 } 1515 if (guest || dochroot) { 1516 /* 1517 * If no chroot directory set yet, use the login directory. 1518 * Copy it so it can be modified while pw->pw_dir stays intact. 1519 */ 1520 if (chrootdir == NULL && 1521 (chrootdir = strdup(pw->pw_dir)) == NULL) 1522 fatalerror("Ran out of memory."); 1523 /* 1524 * Check for the "/chroot/./home" syntax, 1525 * separate the chroot and home directory pathnames. 1526 */ 1527 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1528 *(homedir++) = '\0'; /* wipe '/' */ 1529 homedir++; /* skip '.' */ 1530 } else { 1531 /* 1532 * We MUST do a chdir() after the chroot. Otherwise 1533 * the old current directory will be accessible as "." 1534 * outside the new root! 1535 */ 1536 homedir = "/"; 1537 } 1538 /* 1539 * Finally, do chroot() 1540 */ 1541 if (chroot(chrootdir) < 0) { 1542 reply(550, "Can't change root."); 1543 goto bad; 1544 } 1545 } else /* real user w/o chroot */ 1546 homedir = pw->pw_dir; 1547 /* 1548 * Set euid *before* doing chdir() so 1549 * a) the user won't be carried to a directory that he couldn't reach 1550 * on his own due to no permission to upper path components, 1551 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1552 * (uid 0 has no root power over NFS if not mapped explicitly.) 1553 */ 1554 if (seteuid(pw->pw_uid) < 0) { 1555 reply(550, "Can't set uid."); 1556 goto bad; 1557 } 1558 if (chdir(homedir) < 0) { 1559 if (guest || dochroot) { 1560 reply(550, "Can't change to base directory."); 1561 goto bad; 1562 } else { 1563 if (chdir("/") < 0) { 1564 reply(550, "Root is inaccessible."); 1565 goto bad; 1566 } 1567 lreply(230, "No directory! Logging in with home=/."); 1568 } 1569 } 1570 1571 /* 1572 * Display a login message, if it exists. 1573 * N.B. reply(230,) must follow the message. 1574 */ 1575 #ifdef VIRTUAL_HOSTING 1576 fd = fopen(thishost->loginmsg, "r"); 1577 #else 1578 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1579 #endif 1580 if (fd != NULL) { 1581 char *cp, line[LINE_MAX]; 1582 1583 while (fgets(line, sizeof(line), fd) != NULL) { 1584 if ((cp = strchr(line, '\n')) != NULL) 1585 *cp = '\0'; 1586 lreply(230, "%s", line); 1587 } 1588 fflush(stdout); 1589 fclose(fd); 1590 } 1591 if (guest) { 1592 if (ident != NULL) 1593 free(ident); 1594 ident = strdup(passwd); 1595 if (ident == NULL) 1596 fatalerror("Ran out of memory."); 1597 1598 reply(230, "Guest login ok, access restrictions apply."); 1599 #ifdef SETPROCTITLE 1600 #ifdef VIRTUAL_HOSTING 1601 if (thishost != firsthost) 1602 snprintf(proctitle, sizeof(proctitle), 1603 "%s: anonymous(%s)/%s", remotehost, hostname, 1604 passwd); 1605 else 1606 #endif 1607 snprintf(proctitle, sizeof(proctitle), 1608 "%s: anonymous/%s", remotehost, passwd); 1609 setproctitle("%s", proctitle); 1610 #endif /* SETPROCTITLE */ 1611 if (logging) 1612 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1613 remotehost, passwd); 1614 } else { 1615 if (dochroot) 1616 reply(230, "User %s logged in, " 1617 "access restrictions apply.", pw->pw_name); 1618 else 1619 reply(230, "User %s logged in.", pw->pw_name); 1620 1621 #ifdef SETPROCTITLE 1622 snprintf(proctitle, sizeof(proctitle), 1623 "%s: user/%s", remotehost, pw->pw_name); 1624 setproctitle("%s", proctitle); 1625 #endif /* SETPROCTITLE */ 1626 if (logging) 1627 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1628 remotehost, pw->pw_name); 1629 } 1630 if (logging && (guest || dochroot)) 1631 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1632 #ifdef LOGIN_CAP 1633 login_close(lc); 1634 #endif 1635 if (residue) 1636 free(residue); 1637 return; 1638 bad: 1639 /* Forget all about it... */ 1640 #ifdef LOGIN_CAP 1641 login_close(lc); 1642 #endif 1643 if (residue) 1644 free(residue); 1645 end_login(); 1646 } 1647 1648 void 1649 retrieve(char *cmd, char *name) 1650 { 1651 FILE *fin, *dout; 1652 struct stat st; 1653 int (*closefunc)(FILE *); 1654 time_t start; 1655 1656 if (cmd == 0) { 1657 fin = fopen(name, "r"), closefunc = fclose; 1658 st.st_size = 0; 1659 } else { 1660 char line[BUFSIZ]; 1661 1662 snprintf(line, sizeof(line), cmd, name), name = line; 1663 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1664 st.st_size = -1; 1665 st.st_blksize = BUFSIZ; 1666 } 1667 if (fin == NULL) { 1668 if (errno != 0) { 1669 perror_reply(550, name); 1670 if (cmd == 0) { 1671 LOGCMD("get", name); 1672 } 1673 } 1674 return; 1675 } 1676 byte_count = -1; 1677 if (cmd == 0) { 1678 if (fstat(fileno(fin), &st) < 0) { 1679 perror_reply(550, name); 1680 goto done; 1681 } 1682 if (!S_ISREG(st.st_mode)) { 1683 /* 1684 * Never sending a raw directory is a workaround 1685 * for buggy clients that will attempt to RETR 1686 * a directory before listing it, e.g., Mozilla. 1687 * Preventing a guest from getting irregular files 1688 * is a simple security measure. 1689 */ 1690 if (S_ISDIR(st.st_mode) || guest) { 1691 reply(550, "%s: not a plain file.", name); 1692 goto done; 1693 } 1694 st.st_size = -1; 1695 /* st.st_blksize is set for all descriptor types */ 1696 } 1697 } 1698 if (restart_point) { 1699 if (type == TYPE_A) { 1700 off_t i, n; 1701 int c; 1702 1703 n = restart_point; 1704 i = 0; 1705 while (i++ < n) { 1706 if ((c=getc(fin)) == EOF) { 1707 perror_reply(550, name); 1708 goto done; 1709 } 1710 if (c == '\n') 1711 i++; 1712 } 1713 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1714 perror_reply(550, name); 1715 goto done; 1716 } 1717 } 1718 dout = dataconn(name, st.st_size, "w"); 1719 if (dout == NULL) 1720 goto done; 1721 time(&start); 1722 send_data(fin, dout, st.st_blksize, st.st_size, 1723 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1724 if (cmd == 0 && guest && stats && byte_count > 0) 1725 logxfer(name, byte_count, start); 1726 fclose(dout); 1727 data = -1; 1728 pdata = -1; 1729 done: 1730 if (cmd == 0) 1731 LOGBYTES("get", name, byte_count); 1732 (*closefunc)(fin); 1733 } 1734 1735 void 1736 store(char *name, char *mode, int unique) 1737 { 1738 int fd; 1739 FILE *fout, *din; 1740 int (*closefunc)(FILE *); 1741 1742 if (*mode == 'a') { /* APPE */ 1743 if (unique) { 1744 /* Programming error */ 1745 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1746 unique = 0; 1747 } 1748 if (guest && noguestmod) { 1749 reply(550, "Appending to existing file denied."); 1750 goto err; 1751 } 1752 restart_point = 0; /* not affected by preceding REST */ 1753 } 1754 if (unique) /* STOU overrides REST */ 1755 restart_point = 0; 1756 if (guest && noguestmod) { 1757 if (restart_point) { /* guest STOR w/REST */ 1758 reply(550, "Modifying existing file denied."); 1759 goto err; 1760 } else /* treat guest STOR as STOU */ 1761 unique = 1; 1762 } 1763 1764 if (restart_point) 1765 mode = "r+"; /* so ASCII manual seek can work */ 1766 if (unique) { 1767 if ((fd = guniquefd(name, &name)) < 0) 1768 goto err; 1769 fout = fdopen(fd, mode); 1770 } else 1771 fout = fopen(name, mode); 1772 closefunc = fclose; 1773 if (fout == NULL) { 1774 perror_reply(553, name); 1775 goto err; 1776 } 1777 byte_count = -1; 1778 if (restart_point) { 1779 if (type == TYPE_A) { 1780 off_t i, n; 1781 int c; 1782 1783 n = restart_point; 1784 i = 0; 1785 while (i++ < n) { 1786 if ((c=getc(fout)) == EOF) { 1787 perror_reply(550, name); 1788 goto done; 1789 } 1790 if (c == '\n') 1791 i++; 1792 } 1793 /* 1794 * We must do this seek to "current" position 1795 * because we are changing from reading to 1796 * writing. 1797 */ 1798 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1799 perror_reply(550, name); 1800 goto done; 1801 } 1802 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1803 perror_reply(550, name); 1804 goto done; 1805 } 1806 } 1807 din = dataconn(name, -1, "r"); 1808 if (din == NULL) 1809 goto done; 1810 if (receive_data(din, fout) == 0) { 1811 if (unique) 1812 reply(226, "Transfer complete (unique file name:%s).", 1813 name); 1814 else 1815 reply(226, "Transfer complete."); 1816 } 1817 fclose(din); 1818 data = -1; 1819 pdata = -1; 1820 done: 1821 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1822 (*closefunc)(fout); 1823 return; 1824 err: 1825 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1826 return; 1827 } 1828 1829 static FILE * 1830 getdatasock(char *mode) 1831 { 1832 int on = 1, s, t, tries; 1833 1834 if (data >= 0) 1835 return (fdopen(data, mode)); 1836 1837 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1838 if (s < 0) 1839 goto bad; 1840 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1841 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1842 /* anchor socket to avoid multi-homing problems */ 1843 data_source = ctrl_addr; 1844 data_source.su_port = htons(dataport); 1845 seteuid(0); 1846 for (tries = 1; ; tries++) { 1847 /* 1848 * We should loop here since it's possible that 1849 * another ftpd instance has passed this point and is 1850 * trying to open a data connection in active mode now. 1851 * Until the other connection is opened, we'll be getting 1852 * EADDRINUSE because no SOCK_STREAM sockets in the system 1853 * can share both local and remote addresses, localIP:20 1854 * and *:* in this case. 1855 */ 1856 if (bind(s, (struct sockaddr *)&data_source, 1857 data_source.su_len) >= 0) 1858 break; 1859 if (errno != EADDRINUSE || tries > 10) 1860 goto bad; 1861 sleep(tries); 1862 } 1863 seteuid(pw->pw_uid); 1864 #ifdef IP_TOS 1865 if (data_source.su_family == AF_INET) 1866 { 1867 on = IPTOS_THROUGHPUT; 1868 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1869 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1870 } 1871 #endif 1872 #ifdef TCP_NOPUSH 1873 /* 1874 * Turn off push flag to keep sender TCP from sending short packets 1875 * at the boundaries of each write(). 1876 */ 1877 on = 1; 1878 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1879 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1880 #endif 1881 return (fdopen(s, mode)); 1882 bad: 1883 /* Return the real value of errno (close may change it) */ 1884 t = errno; 1885 seteuid(pw->pw_uid); 1886 close(s); 1887 errno = t; 1888 return (NULL); 1889 } 1890 1891 static FILE * 1892 dataconn(char *name, off_t size, char *mode) 1893 { 1894 char sizebuf[32]; 1895 FILE *file; 1896 int retry = 0, tos, conerrno; 1897 1898 file_size = size; 1899 byte_count = 0; 1900 if (size != -1) 1901 snprintf(sizebuf, sizeof(sizebuf), 1902 " (%jd bytes)", (intmax_t)size); 1903 else 1904 *sizebuf = '\0'; 1905 if (pdata >= 0) { 1906 union sockunion from; 1907 socklen_t fromlen = ctrl_addr.su_len; 1908 int flags, s; 1909 struct timeval timeout; 1910 fd_set set; 1911 1912 FD_ZERO(&set); 1913 FD_SET(pdata, &set); 1914 1915 timeout.tv_usec = 0; 1916 timeout.tv_sec = 120; 1917 1918 /* 1919 * Granted a socket is in the blocking I/O mode, 1920 * accept() will block after a successful select() 1921 * if the selected connection dies in between. 1922 * Therefore set the non-blocking I/O flag here. 1923 */ 1924 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1925 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1926 goto pdata_err; 1927 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1928 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1929 goto pdata_err; 1930 close(pdata); 1931 pdata = s; 1932 /* 1933 * Unset the inherited non-blocking I/O flag 1934 * on the child socket so stdio can work on it. 1935 */ 1936 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1937 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1938 goto pdata_err; 1939 #ifdef IP_TOS 1940 if (from.su_family == AF_INET) 1941 { 1942 tos = IPTOS_THROUGHPUT; 1943 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1944 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1945 } 1946 #endif 1947 reply(150, "Opening %s mode data connection for '%s'%s.", 1948 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1949 return (fdopen(pdata, mode)); 1950 pdata_err: 1951 reply(425, "Can't open data connection."); 1952 close(pdata); 1953 pdata = -1; 1954 return (NULL); 1955 } 1956 if (data >= 0) { 1957 reply(125, "Using existing data connection for '%s'%s.", 1958 name, sizebuf); 1959 usedefault = 1; 1960 return (fdopen(data, mode)); 1961 } 1962 if (usedefault) 1963 data_dest = his_addr; 1964 usedefault = 1; 1965 do { 1966 file = getdatasock(mode); 1967 if (file == NULL) { 1968 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1969 1970 if (getnameinfo((struct sockaddr *)&data_source, 1971 data_source.su_len, 1972 hostbuf, sizeof(hostbuf) - 1, 1973 portbuf, sizeof(portbuf) - 1, 1974 NI_NUMERICHOST|NI_NUMERICSERV)) 1975 *hostbuf = *portbuf = 0; 1976 hostbuf[sizeof(hostbuf) - 1] = 0; 1977 portbuf[sizeof(portbuf) - 1] = 0; 1978 reply(425, "Can't create data socket (%s,%s): %s.", 1979 hostbuf, portbuf, strerror(errno)); 1980 return (NULL); 1981 } 1982 data = fileno(file); 1983 conerrno = 0; 1984 if (connect(data, (struct sockaddr *)&data_dest, 1985 data_dest.su_len) == 0) 1986 break; 1987 conerrno = errno; 1988 fclose(file); 1989 data = -1; 1990 if (conerrno == EADDRINUSE) { 1991 sleep(swaitint); 1992 retry += swaitint; 1993 } else { 1994 break; 1995 } 1996 } while (retry <= swaitmax); 1997 if (conerrno != 0) { 1998 reply(425, "Can't build data connection: %s.", 1999 strerror(conerrno)); 2000 return (NULL); 2001 } 2002 reply(150, "Opening %s mode data connection for '%s'%s.", 2003 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2004 return (file); 2005 } 2006 2007 /* 2008 * A helper macro to avoid code duplication 2009 * in send_data() and receive_data(). 2010 * 2011 * XXX We have to block SIGURG during putc() because BSD stdio 2012 * is unable to restart interrupted write operations and hence 2013 * the entire buffer contents will be lost as soon as a write() 2014 * call indicates EINTR to stdio. 2015 */ 2016 #define FTPD_PUTC(ch, file, label) \ 2017 do { \ 2018 int ret; \ 2019 \ 2020 do { \ 2021 START_UNSAFE; \ 2022 ret = putc((ch), (file)); \ 2023 END_UNSAFE; \ 2024 CHECKOOB(return (-1)) \ 2025 else if (ferror(file)) \ 2026 goto label; \ 2027 clearerr(file); \ 2028 } while (ret == EOF); \ 2029 } while (0) 2030 2031 /* 2032 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2033 * encapsulation of the data subject to Mode, Structure, and Type. 2034 * 2035 * NB: Form isn't handled. 2036 */ 2037 static int 2038 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2039 { 2040 int c, cp, filefd, netfd; 2041 char *buf; 2042 2043 STARTXFER; 2044 2045 switch (type) { 2046 2047 case TYPE_A: 2048 cp = EOF; 2049 for (;;) { 2050 c = getc(instr); 2051 CHECKOOB(return (-1)) 2052 else if (c == EOF && ferror(instr)) 2053 goto file_err; 2054 if (c == EOF) { 2055 if (ferror(instr)) { /* resume after OOB */ 2056 clearerr(instr); 2057 continue; 2058 } 2059 if (feof(instr)) /* EOF */ 2060 break; 2061 syslog(LOG_ERR, "Internal: impossible condition" 2062 " on file after getc()"); 2063 goto file_err; 2064 } 2065 if (c == '\n' && cp != '\r') { 2066 FTPD_PUTC('\r', outstr, data_err); 2067 byte_count++; 2068 } 2069 FTPD_PUTC(c, outstr, data_err); 2070 byte_count++; 2071 cp = c; 2072 } 2073 #ifdef notyet /* BSD stdio isn't ready for that */ 2074 while (fflush(outstr) == EOF) { 2075 CHECKOOB(return (-1)) 2076 else 2077 goto data_err; 2078 clearerr(outstr); 2079 } 2080 ENDXFER; 2081 #else 2082 ENDXFER; 2083 if (fflush(outstr) == EOF) 2084 goto data_err; 2085 #endif 2086 reply(226, "Transfer complete."); 2087 return (0); 2088 2089 case TYPE_I: 2090 case TYPE_L: 2091 /* 2092 * isreg is only set if we are not doing restart and we 2093 * are sending a regular file 2094 */ 2095 netfd = fileno(outstr); 2096 filefd = fileno(instr); 2097 2098 if (isreg) { 2099 char *msg = "Transfer complete."; 2100 off_t cnt, offset; 2101 int err; 2102 2103 cnt = offset = 0; 2104 2105 while (filesize > 0) { 2106 err = sendfile(filefd, netfd, offset, 0, 2107 NULL, &cnt, 0); 2108 /* 2109 * Calculate byte_count before OOB processing. 2110 * It can be used in myoob() later. 2111 */ 2112 byte_count += cnt; 2113 offset += cnt; 2114 filesize -= cnt; 2115 CHECKOOB(return (-1)) 2116 else if (err == -1) { 2117 if (errno != EINTR && 2118 cnt == 0 && offset == 0) 2119 goto oldway; 2120 goto data_err; 2121 } 2122 if (err == -1) /* resume after OOB */ 2123 continue; 2124 /* 2125 * We hit the EOF prematurely. 2126 * Perhaps the file was externally truncated. 2127 */ 2128 if (cnt == 0) { 2129 msg = "Transfer finished due to " 2130 "premature end of file."; 2131 break; 2132 } 2133 } 2134 ENDXFER; 2135 reply(226, msg); 2136 return (0); 2137 } 2138 2139 oldway: 2140 if ((buf = malloc(blksize)) == NULL) { 2141 ENDXFER; 2142 reply(451, "Ran out of memory."); 2143 return (-1); 2144 } 2145 2146 for (;;) { 2147 int cnt, len; 2148 char *bp; 2149 2150 cnt = read(filefd, buf, blksize); 2151 CHECKOOB(free(buf); return (-1)) 2152 else if (cnt < 0) { 2153 free(buf); 2154 goto file_err; 2155 } 2156 if (cnt < 0) /* resume after OOB */ 2157 continue; 2158 if (cnt == 0) /* EOF */ 2159 break; 2160 for (len = cnt, bp = buf; len > 0;) { 2161 cnt = write(netfd, bp, len); 2162 CHECKOOB(free(buf); return (-1)) 2163 else if (cnt < 0) { 2164 free(buf); 2165 goto data_err; 2166 } 2167 if (cnt <= 0) 2168 continue; 2169 len -= cnt; 2170 bp += cnt; 2171 byte_count += cnt; 2172 } 2173 } 2174 ENDXFER; 2175 free(buf); 2176 reply(226, "Transfer complete."); 2177 return (0); 2178 default: 2179 ENDXFER; 2180 reply(550, "Unimplemented TYPE %d in send_data.", type); 2181 return (-1); 2182 } 2183 2184 data_err: 2185 ENDXFER; 2186 perror_reply(426, "Data connection"); 2187 return (-1); 2188 2189 file_err: 2190 ENDXFER; 2191 perror_reply(551, "Error on input file"); 2192 return (-1); 2193 } 2194 2195 /* 2196 * Transfer data from peer to "outstr" using the appropriate encapulation of 2197 * the data subject to Mode, Structure, and Type. 2198 * 2199 * N.B.: Form isn't handled. 2200 */ 2201 static int 2202 receive_data(FILE *instr, FILE *outstr) 2203 { 2204 int c, cp; 2205 int bare_lfs = 0; 2206 2207 STARTXFER; 2208 2209 switch (type) { 2210 2211 case TYPE_I: 2212 case TYPE_L: 2213 for (;;) { 2214 int cnt, len; 2215 char *bp; 2216 char buf[BUFSIZ]; 2217 2218 cnt = read(fileno(instr), buf, sizeof(buf)); 2219 CHECKOOB(return (-1)) 2220 else if (cnt < 0) 2221 goto data_err; 2222 if (cnt < 0) /* resume after OOB */ 2223 continue; 2224 if (cnt == 0) /* EOF */ 2225 break; 2226 for (len = cnt, bp = buf; len > 0;) { 2227 cnt = write(fileno(outstr), bp, len); 2228 CHECKOOB(return (-1)) 2229 else if (cnt < 0) 2230 goto file_err; 2231 if (cnt <= 0) 2232 continue; 2233 len -= cnt; 2234 bp += cnt; 2235 byte_count += cnt; 2236 } 2237 } 2238 ENDXFER; 2239 return (0); 2240 2241 case TYPE_E: 2242 ENDXFER; 2243 reply(553, "TYPE E not implemented."); 2244 return (-1); 2245 2246 case TYPE_A: 2247 cp = EOF; 2248 for (;;) { 2249 c = getc(instr); 2250 CHECKOOB(return (-1)) 2251 else if (c == EOF && ferror(instr)) 2252 goto data_err; 2253 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2254 clearerr(instr); 2255 continue; 2256 } 2257 2258 if (cp == '\r') { 2259 if (c != '\n') 2260 FTPD_PUTC('\r', outstr, file_err); 2261 } else 2262 if (c == '\n') 2263 bare_lfs++; 2264 if (c == '\r') { 2265 byte_count++; 2266 cp = c; 2267 continue; 2268 } 2269 2270 /* Check for EOF here in order not to lose last \r. */ 2271 if (c == EOF) { 2272 if (feof(instr)) /* EOF */ 2273 break; 2274 syslog(LOG_ERR, "Internal: impossible condition" 2275 " on data stream after getc()"); 2276 goto data_err; 2277 } 2278 2279 byte_count++; 2280 FTPD_PUTC(c, outstr, file_err); 2281 cp = c; 2282 } 2283 #ifdef notyet /* BSD stdio isn't ready for that */ 2284 while (fflush(outstr) == EOF) { 2285 CHECKOOB(return (-1)) 2286 else 2287 goto file_err; 2288 clearerr(outstr); 2289 } 2290 ENDXFER; 2291 #else 2292 ENDXFER; 2293 if (fflush(outstr) == EOF) 2294 goto file_err; 2295 #endif 2296 if (bare_lfs) { 2297 lreply(226, 2298 "WARNING! %d bare linefeeds received in ASCII mode.", 2299 bare_lfs); 2300 printf(" File may not have transferred correctly.\r\n"); 2301 } 2302 return (0); 2303 default: 2304 ENDXFER; 2305 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2306 return (-1); 2307 } 2308 2309 data_err: 2310 ENDXFER; 2311 perror_reply(426, "Data connection"); 2312 return (-1); 2313 2314 file_err: 2315 ENDXFER; 2316 perror_reply(452, "Error writing to file"); 2317 return (-1); 2318 } 2319 2320 void 2321 statfilecmd(char *filename) 2322 { 2323 FILE *fin; 2324 int atstart; 2325 int c, code; 2326 char line[LINE_MAX]; 2327 struct stat st; 2328 2329 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2330 snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2331 fin = ftpd_popen(line, "r"); 2332 lreply(code, "Status of %s:", filename); 2333 atstart = 1; 2334 while ((c = getc(fin)) != EOF) { 2335 if (c == '\n') { 2336 if (ferror(stdout)){ 2337 perror_reply(421, "Control connection"); 2338 ftpd_pclose(fin); 2339 dologout(1); 2340 /* NOTREACHED */ 2341 } 2342 if (ferror(fin)) { 2343 perror_reply(551, filename); 2344 ftpd_pclose(fin); 2345 return; 2346 } 2347 putc('\r', stdout); 2348 } 2349 /* 2350 * RFC 959 says neutral text should be prepended before 2351 * a leading 3-digit number followed by whitespace, but 2352 * many ftp clients can be confused by any leading digits, 2353 * as a matter of fact. 2354 */ 2355 if (atstart && isdigit(c)) 2356 putc(' ', stdout); 2357 putc(c, stdout); 2358 atstart = (c == '\n'); 2359 } 2360 ftpd_pclose(fin); 2361 reply(code, "End of status."); 2362 } 2363 2364 void 2365 statcmd(void) 2366 { 2367 union sockunion *su; 2368 u_char *a, *p; 2369 char hname[NI_MAXHOST]; 2370 int ispassive; 2371 2372 if (hostinfo) { 2373 lreply(211, "%s FTP server status:", hostname); 2374 printf(" %s\r\n", version); 2375 } else 2376 lreply(211, "FTP server status:"); 2377 printf(" Connected to %s", remotehost); 2378 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2379 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2380 hname[sizeof(hname) - 1] = 0; 2381 if (strcmp(hname, remotehost) != 0) 2382 printf(" (%s)", hname); 2383 } 2384 printf("\r\n"); 2385 if (logged_in) { 2386 if (guest) 2387 printf(" Logged in anonymously\r\n"); 2388 else 2389 printf(" Logged in as %s\r\n", pw->pw_name); 2390 } else if (askpasswd) 2391 printf(" Waiting for password\r\n"); 2392 else 2393 printf(" Waiting for user name\r\n"); 2394 printf(" TYPE: %s", typenames[type]); 2395 if (type == TYPE_A || type == TYPE_E) 2396 printf(", FORM: %s", formnames[form]); 2397 if (type == TYPE_L) 2398 #if CHAR_BIT == 8 2399 printf(" %d", CHAR_BIT); 2400 #else 2401 printf(" %d", bytesize); /* need definition! */ 2402 #endif 2403 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2404 strunames[stru], modenames[mode]); 2405 if (data != -1) 2406 printf(" Data connection open\r\n"); 2407 else if (pdata != -1) { 2408 ispassive = 1; 2409 su = &pasv_addr; 2410 goto printaddr; 2411 } else if (usedefault == 0) { 2412 ispassive = 0; 2413 su = &data_dest; 2414 printaddr: 2415 #define UC(b) (((int) b) & 0xff) 2416 if (epsvall) { 2417 printf(" EPSV only mode (EPSV ALL)\r\n"); 2418 goto epsvonly; 2419 } 2420 2421 /* PORT/PASV */ 2422 if (su->su_family == AF_INET) { 2423 a = (u_char *) &su->su_sin.sin_addr; 2424 p = (u_char *) &su->su_sin.sin_port; 2425 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2426 ispassive ? "PASV" : "PORT", 2427 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2428 UC(p[0]), UC(p[1])); 2429 } 2430 2431 /* LPRT/LPSV */ 2432 { 2433 int alen, af, i; 2434 2435 switch (su->su_family) { 2436 case AF_INET: 2437 a = (u_char *) &su->su_sin.sin_addr; 2438 p = (u_char *) &su->su_sin.sin_port; 2439 alen = sizeof(su->su_sin.sin_addr); 2440 af = 4; 2441 break; 2442 case AF_INET6: 2443 a = (u_char *) &su->su_sin6.sin6_addr; 2444 p = (u_char *) &su->su_sin6.sin6_port; 2445 alen = sizeof(su->su_sin6.sin6_addr); 2446 af = 6; 2447 break; 2448 default: 2449 af = 0; 2450 break; 2451 } 2452 if (af) { 2453 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2454 af, alen); 2455 for (i = 0; i < alen; i++) 2456 printf("%d,", UC(a[i])); 2457 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2458 } 2459 } 2460 2461 epsvonly:; 2462 /* EPRT/EPSV */ 2463 { 2464 int af; 2465 2466 switch (su->su_family) { 2467 case AF_INET: 2468 af = 1; 2469 break; 2470 case AF_INET6: 2471 af = 2; 2472 break; 2473 default: 2474 af = 0; 2475 break; 2476 } 2477 if (af) { 2478 union sockunion tmp; 2479 2480 tmp = *su; 2481 if (tmp.su_family == AF_INET6) 2482 tmp.su_sin6.sin6_scope_id = 0; 2483 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2484 hname, sizeof(hname) - 1, NULL, 0, 2485 NI_NUMERICHOST)) { 2486 hname[sizeof(hname) - 1] = 0; 2487 printf(" %s |%d|%s|%d|\r\n", 2488 ispassive ? "EPSV" : "EPRT", 2489 af, hname, htons(tmp.su_port)); 2490 } 2491 } 2492 } 2493 #undef UC 2494 } else 2495 printf(" No data connection\r\n"); 2496 reply(211, "End of status."); 2497 } 2498 2499 void 2500 fatalerror(char *s) 2501 { 2502 2503 reply(451, "Error in server: %s", s); 2504 reply(221, "Closing connection due to server error."); 2505 dologout(0); 2506 /* NOTREACHED */ 2507 } 2508 2509 void 2510 reply(int n, const char *fmt, ...) 2511 { 2512 va_list ap; 2513 2514 printf("%d ", n); 2515 va_start(ap, fmt); 2516 vprintf(fmt, ap); 2517 va_end(ap); 2518 printf("\r\n"); 2519 fflush(stdout); 2520 if (ftpdebug) { 2521 syslog(LOG_DEBUG, "<--- %d ", n); 2522 va_start(ap, fmt); 2523 vsyslog(LOG_DEBUG, fmt, ap); 2524 va_end(ap); 2525 } 2526 } 2527 2528 void 2529 lreply(int n, const char *fmt, ...) 2530 { 2531 va_list ap; 2532 2533 printf("%d- ", n); 2534 va_start(ap, fmt); 2535 vprintf(fmt, ap); 2536 va_end(ap); 2537 printf("\r\n"); 2538 fflush(stdout); 2539 if (ftpdebug) { 2540 syslog(LOG_DEBUG, "<--- %d- ", n); 2541 va_start(ap, fmt); 2542 vsyslog(LOG_DEBUG, fmt, ap); 2543 va_end(ap); 2544 } 2545 } 2546 2547 static void 2548 ack(char *s) 2549 { 2550 2551 reply(250, "%s command successful.", s); 2552 } 2553 2554 void 2555 nack(char *s) 2556 { 2557 2558 reply(502, "%s command not implemented.", s); 2559 } 2560 2561 /* ARGSUSED */ 2562 void 2563 yyerror(char *s) 2564 { 2565 char *cp; 2566 2567 if ((cp = strchr(cbuf,'\n'))) 2568 *cp = '\0'; 2569 reply(500, "%s: command not understood.", cbuf); 2570 } 2571 2572 void 2573 delete(char *name) 2574 { 2575 struct stat st; 2576 2577 LOGCMD("delete", name); 2578 if (lstat(name, &st) < 0) { 2579 perror_reply(550, name); 2580 return; 2581 } 2582 if (S_ISDIR(st.st_mode)) { 2583 if (rmdir(name) < 0) { 2584 perror_reply(550, name); 2585 return; 2586 } 2587 goto done; 2588 } 2589 if (guest && noguestmod) { 2590 reply(550, "Operation not permitted."); 2591 return; 2592 } 2593 if (unlink(name) < 0) { 2594 perror_reply(550, name); 2595 return; 2596 } 2597 done: 2598 ack("DELE"); 2599 } 2600 2601 void 2602 cwd(char *path) 2603 { 2604 2605 if (chdir(path) < 0) 2606 perror_reply(550, path); 2607 else 2608 ack("CWD"); 2609 } 2610 2611 void 2612 makedir(char *name) 2613 { 2614 char *s; 2615 2616 LOGCMD("mkdir", name); 2617 if (guest && noguestmkd) 2618 reply(550, "Operation not permitted."); 2619 else if (mkdir(name, 0777) < 0) 2620 perror_reply(550, name); 2621 else { 2622 if ((s = doublequote(name)) == NULL) 2623 fatalerror("Ran out of memory."); 2624 reply(257, "\"%s\" directory created.", s); 2625 free(s); 2626 } 2627 } 2628 2629 void 2630 removedir(char *name) 2631 { 2632 2633 LOGCMD("rmdir", name); 2634 if (rmdir(name) < 0) 2635 perror_reply(550, name); 2636 else 2637 ack("RMD"); 2638 } 2639 2640 void 2641 pwd(void) 2642 { 2643 char *s, path[MAXPATHLEN + 1]; 2644 2645 if (getcwd(path, sizeof(path)) == NULL) 2646 perror_reply(550, "Get current directory"); 2647 else { 2648 if ((s = doublequote(path)) == NULL) 2649 fatalerror("Ran out of memory."); 2650 reply(257, "\"%s\" is current directory.", s); 2651 free(s); 2652 } 2653 } 2654 2655 char * 2656 renamefrom(char *name) 2657 { 2658 struct stat st; 2659 2660 if (guest && noguestmod) { 2661 reply(550, "Operation not permitted."); 2662 return (NULL); 2663 } 2664 if (lstat(name, &st) < 0) { 2665 perror_reply(550, name); 2666 return (NULL); 2667 } 2668 reply(350, "File exists, ready for destination name."); 2669 return (name); 2670 } 2671 2672 void 2673 renamecmd(char *from, char *to) 2674 { 2675 struct stat st; 2676 2677 LOGCMD2("rename", from, to); 2678 2679 if (guest && (stat(to, &st) == 0)) { 2680 reply(550, "%s: permission denied.", to); 2681 return; 2682 } 2683 2684 if (rename(from, to) < 0) 2685 perror_reply(550, "rename"); 2686 else 2687 ack("RNTO"); 2688 } 2689 2690 static void 2691 dolog(struct sockaddr *who) 2692 { 2693 char who_name[NI_MAXHOST]; 2694 2695 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2696 remotehost[sizeof(remotehost) - 1] = 0; 2697 if (getnameinfo(who, who->sa_len, 2698 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2699 *who_name = 0; 2700 who_name[sizeof(who_name) - 1] = 0; 2701 2702 #ifdef SETPROCTITLE 2703 #ifdef VIRTUAL_HOSTING 2704 if (thishost != firsthost) 2705 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2706 remotehost, hostname); 2707 else 2708 #endif 2709 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2710 remotehost); 2711 setproctitle("%s", proctitle); 2712 #endif /* SETPROCTITLE */ 2713 2714 if (logging) { 2715 #ifdef VIRTUAL_HOSTING 2716 if (thishost != firsthost) 2717 syslog(LOG_INFO, "connection from %s (%s) to %s", 2718 remotehost, who_name, hostname); 2719 else 2720 #endif 2721 syslog(LOG_INFO, "connection from %s (%s)", 2722 remotehost, who_name); 2723 } 2724 } 2725 2726 /* 2727 * Record logout in wtmp file 2728 * and exit with supplied status. 2729 */ 2730 void 2731 dologout(int status) 2732 { 2733 2734 if (logged_in && dowtmp) { 2735 seteuid(0); 2736 ftpd_logwtmp(ttyline, "", NULL); 2737 } 2738 /* beware of flushing buffers after a SIGPIPE */ 2739 _exit(status); 2740 } 2741 2742 static void 2743 sigurg(int signo) 2744 { 2745 2746 recvurg = 1; 2747 } 2748 2749 static void 2750 maskurg(int flag) 2751 { 2752 int oerrno; 2753 sigset_t sset; 2754 2755 if (!transflag) { 2756 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2757 return; 2758 } 2759 oerrno = errno; 2760 sigemptyset(&sset); 2761 sigaddset(&sset, SIGURG); 2762 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2763 errno = oerrno; 2764 } 2765 2766 static void 2767 flagxfer(int flag) 2768 { 2769 2770 if (flag) { 2771 if (transflag) 2772 syslog(LOG_ERR, "Internal: flagxfer(1): " 2773 "transfer already under way"); 2774 transflag = 1; 2775 maskurg(0); 2776 recvurg = 0; 2777 } else { 2778 if (!transflag) 2779 syslog(LOG_ERR, "Internal: flagxfer(0): " 2780 "no active transfer"); 2781 maskurg(1); 2782 transflag = 0; 2783 } 2784 } 2785 2786 /* 2787 * Returns 0 if OK to resume or -1 if abort requested. 2788 */ 2789 static int 2790 myoob(void) 2791 { 2792 char *cp; 2793 int ret; 2794 2795 if (!transflag) { 2796 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2797 return (0); 2798 } 2799 cp = tmpline; 2800 ret = getline(cp, 7, stdin); 2801 if (ret == -1) { 2802 reply(221, "You could at least say goodbye."); 2803 dologout(0); 2804 } else if (ret == -2) { 2805 /* Ignore truncated command. */ 2806 return (0); 2807 } 2808 upper(cp); 2809 if (strcmp(cp, "ABOR\r\n") == 0) { 2810 tmpline[0] = '\0'; 2811 reply(426, "Transfer aborted. Data connection closed."); 2812 reply(226, "Abort successful."); 2813 return (-1); 2814 } 2815 if (strcmp(cp, "STAT\r\n") == 0) { 2816 tmpline[0] = '\0'; 2817 if (file_size != -1) 2818 reply(213, "Status: %jd of %jd bytes transferred.", 2819 (intmax_t)byte_count, (intmax_t)file_size); 2820 else 2821 reply(213, "Status: %jd bytes transferred.", 2822 (intmax_t)byte_count); 2823 } 2824 return (0); 2825 } 2826 2827 /* 2828 * Note: a response of 425 is not mentioned as a possible response to 2829 * the PASV command in RFC959. However, it has been blessed as 2830 * a legitimate response by Jon Postel in a telephone conversation 2831 * with Rick Adams on 25 Jan 89. 2832 */ 2833 void 2834 passive(void) 2835 { 2836 socklen_t len; 2837 int on; 2838 char *p, *a; 2839 2840 if (pdata >= 0) /* close old port if one set */ 2841 close(pdata); 2842 2843 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2844 if (pdata < 0) { 2845 perror_reply(425, "Can't open passive connection"); 2846 return; 2847 } 2848 on = 1; 2849 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2850 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2851 2852 seteuid(0); 2853 2854 #ifdef IP_PORTRANGE 2855 if (ctrl_addr.su_family == AF_INET) { 2856 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2857 : IP_PORTRANGE_DEFAULT; 2858 2859 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2860 &on, sizeof(on)) < 0) 2861 goto pasv_error; 2862 } 2863 #endif 2864 #ifdef IPV6_PORTRANGE 2865 if (ctrl_addr.su_family == AF_INET6) { 2866 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2867 : IPV6_PORTRANGE_DEFAULT; 2868 2869 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2870 &on, sizeof(on)) < 0) 2871 goto pasv_error; 2872 } 2873 #endif 2874 2875 pasv_addr = ctrl_addr; 2876 pasv_addr.su_port = 0; 2877 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2878 goto pasv_error; 2879 2880 seteuid(pw->pw_uid); 2881 2882 len = sizeof(pasv_addr); 2883 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2884 goto pasv_error; 2885 if (listen(pdata, 1) < 0) 2886 goto pasv_error; 2887 if (pasv_addr.su_family == AF_INET) 2888 a = (char *) &pasv_addr.su_sin.sin_addr; 2889 else if (pasv_addr.su_family == AF_INET6 && 2890 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2891 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2892 else 2893 goto pasv_error; 2894 2895 p = (char *) &pasv_addr.su_port; 2896 2897 #define UC(b) (((int) b) & 0xff) 2898 2899 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2900 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2901 return; 2902 2903 pasv_error: 2904 seteuid(pw->pw_uid); 2905 close(pdata); 2906 pdata = -1; 2907 perror_reply(425, "Can't open passive connection"); 2908 return; 2909 } 2910 2911 /* 2912 * Long Passive defined in RFC 1639. 2913 * 228 Entering Long Passive Mode 2914 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2915 */ 2916 2917 void 2918 long_passive(char *cmd, int pf) 2919 { 2920 socklen_t len; 2921 int on; 2922 char *p, *a; 2923 2924 if (pdata >= 0) /* close old port if one set */ 2925 close(pdata); 2926 2927 if (pf != PF_UNSPEC) { 2928 if (ctrl_addr.su_family != pf) { 2929 switch (ctrl_addr.su_family) { 2930 case AF_INET: 2931 pf = 1; 2932 break; 2933 case AF_INET6: 2934 pf = 2; 2935 break; 2936 default: 2937 pf = 0; 2938 break; 2939 } 2940 /* 2941 * XXX 2942 * only EPRT/EPSV ready clients will understand this 2943 */ 2944 if (strcmp(cmd, "EPSV") == 0 && pf) { 2945 reply(522, "Network protocol mismatch, " 2946 "use (%d)", pf); 2947 } else 2948 reply(501, "Network protocol mismatch."); /*XXX*/ 2949 2950 return; 2951 } 2952 } 2953 2954 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2955 if (pdata < 0) { 2956 perror_reply(425, "Can't open passive connection"); 2957 return; 2958 } 2959 on = 1; 2960 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2961 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2962 2963 seteuid(0); 2964 2965 pasv_addr = ctrl_addr; 2966 pasv_addr.su_port = 0; 2967 len = pasv_addr.su_len; 2968 2969 #ifdef IP_PORTRANGE 2970 if (ctrl_addr.su_family == AF_INET) { 2971 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2972 : IP_PORTRANGE_DEFAULT; 2973 2974 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2975 &on, sizeof(on)) < 0) 2976 goto pasv_error; 2977 } 2978 #endif 2979 #ifdef IPV6_PORTRANGE 2980 if (ctrl_addr.su_family == AF_INET6) { 2981 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2982 : IPV6_PORTRANGE_DEFAULT; 2983 2984 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2985 &on, sizeof(on)) < 0) 2986 goto pasv_error; 2987 } 2988 #endif 2989 2990 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2991 goto pasv_error; 2992 2993 seteuid(pw->pw_uid); 2994 2995 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2996 goto pasv_error; 2997 if (listen(pdata, 1) < 0) 2998 goto pasv_error; 2999 3000 #define UC(b) (((int) b) & 0xff) 3001 3002 if (strcmp(cmd, "LPSV") == 0) { 3003 p = (char *)&pasv_addr.su_port; 3004 switch (pasv_addr.su_family) { 3005 case AF_INET: 3006 a = (char *) &pasv_addr.su_sin.sin_addr; 3007 v4_reply: 3008 reply(228, 3009 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3010 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3011 2, UC(p[0]), UC(p[1])); 3012 return; 3013 case AF_INET6: 3014 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3015 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3016 goto v4_reply; 3017 } 3018 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3019 reply(228, 3020 "Entering Long Passive Mode " 3021 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3022 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3023 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3024 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3025 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3026 2, UC(p[0]), UC(p[1])); 3027 return; 3028 } 3029 } else if (strcmp(cmd, "EPSV") == 0) { 3030 switch (pasv_addr.su_family) { 3031 case AF_INET: 3032 case AF_INET6: 3033 reply(229, "Entering Extended Passive Mode (|||%d|)", 3034 ntohs(pasv_addr.su_port)); 3035 return; 3036 } 3037 } else { 3038 /* more proper error code? */ 3039 } 3040 3041 pasv_error: 3042 seteuid(pw->pw_uid); 3043 close(pdata); 3044 pdata = -1; 3045 perror_reply(425, "Can't open passive connection"); 3046 return; 3047 } 3048 3049 /* 3050 * Generate unique name for file with basename "local" 3051 * and open the file in order to avoid possible races. 3052 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3053 * Return descriptor to the file, set "name" to its name. 3054 * 3055 * Generates failure reply on error. 3056 */ 3057 static int 3058 guniquefd(char *local, char **name) 3059 { 3060 static char new[MAXPATHLEN]; 3061 struct stat st; 3062 char *cp; 3063 int count; 3064 int fd; 3065 3066 cp = strrchr(local, '/'); 3067 if (cp) 3068 *cp = '\0'; 3069 if (stat(cp ? local : ".", &st) < 0) { 3070 perror_reply(553, cp ? local : "."); 3071 return (-1); 3072 } 3073 if (cp) { 3074 /* 3075 * Let not overwrite dirname with counter suffix. 3076 * -4 is for /nn\0 3077 * In this extreme case dot won't be put in front of suffix. 3078 */ 3079 if (strlen(local) > sizeof(new) - 4) { 3080 reply(553, "Pathname too long."); 3081 return (-1); 3082 } 3083 *cp = '/'; 3084 } 3085 /* -4 is for the .nn<null> we put on the end below */ 3086 snprintf(new, sizeof(new) - 4, "%s", local); 3087 cp = new + strlen(new); 3088 /* 3089 * Don't generate dotfile unless requested explicitly. 3090 * This covers the case when basename gets truncated off 3091 * by buffer size. 3092 */ 3093 if (cp > new && cp[-1] != '/') 3094 *cp++ = '.'; 3095 for (count = 0; count < 100; count++) { 3096 /* At count 0 try unmodified name */ 3097 if (count) 3098 sprintf(cp, "%d", count); 3099 if ((fd = open(count ? new : local, 3100 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3101 *name = count ? new : local; 3102 return (fd); 3103 } 3104 if (errno != EEXIST) { 3105 perror_reply(553, count ? new : local); 3106 return (-1); 3107 } 3108 } 3109 reply(452, "Unique file name cannot be created."); 3110 return (-1); 3111 } 3112 3113 /* 3114 * Format and send reply containing system error number. 3115 */ 3116 void 3117 perror_reply(int code, char *string) 3118 { 3119 3120 reply(code, "%s: %s.", string, strerror(errno)); 3121 } 3122 3123 static char *onefile[] = { 3124 "", 3125 0 3126 }; 3127 3128 void 3129 send_file_list(char *whichf) 3130 { 3131 struct stat st; 3132 DIR *dirp = NULL; 3133 struct dirent *dir; 3134 FILE *dout = NULL; 3135 char **dirlist, *dirname; 3136 int simple = 0; 3137 int freeglob = 0; 3138 glob_t gl; 3139 3140 if (strpbrk(whichf, "~{[*?") != NULL) { 3141 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3142 3143 memset(&gl, 0, sizeof(gl)); 3144 gl.gl_matchc = MAXGLOBARGS; 3145 flags |= GLOB_LIMIT; 3146 freeglob = 1; 3147 if (glob(whichf, flags, 0, &gl)) { 3148 reply(550, "No matching files found."); 3149 goto out; 3150 } else if (gl.gl_pathc == 0) { 3151 errno = ENOENT; 3152 perror_reply(550, whichf); 3153 goto out; 3154 } 3155 dirlist = gl.gl_pathv; 3156 } else { 3157 onefile[0] = whichf; 3158 dirlist = onefile; 3159 simple = 1; 3160 } 3161 3162 while ((dirname = *dirlist++)) { 3163 if (stat(dirname, &st) < 0) { 3164 /* 3165 * If user typed "ls -l", etc, and the client 3166 * used NLST, do what the user meant. 3167 */ 3168 if (dirname[0] == '-' && *dirlist == NULL && 3169 dout == NULL) 3170 retrieve(_PATH_LS " %s", dirname); 3171 else 3172 perror_reply(550, whichf); 3173 goto out; 3174 } 3175 3176 if (S_ISREG(st.st_mode)) { 3177 if (dout == NULL) { 3178 dout = dataconn("file list", -1, "w"); 3179 if (dout == NULL) 3180 goto out; 3181 STARTXFER; 3182 } 3183 START_UNSAFE; 3184 fprintf(dout, "%s%s\n", dirname, 3185 type == TYPE_A ? "\r" : ""); 3186 END_UNSAFE; 3187 if (ferror(dout)) 3188 goto data_err; 3189 byte_count += strlen(dirname) + 3190 (type == TYPE_A ? 2 : 1); 3191 CHECKOOB(goto abrt); 3192 continue; 3193 } else if (!S_ISDIR(st.st_mode)) 3194 continue; 3195 3196 if ((dirp = opendir(dirname)) == NULL) 3197 continue; 3198 3199 while ((dir = readdir(dirp)) != NULL) { 3200 char nbuf[MAXPATHLEN]; 3201 3202 CHECKOOB(goto abrt); 3203 3204 if (strcmp(dir->d_name, ".") == 0) 3205 continue; 3206 if (strcmp(dir->d_name, "..") == 0) 3207 continue; 3208 3209 snprintf(nbuf, sizeof(nbuf), 3210 "%s/%s", dirname, dir->d_name); 3211 3212 /* 3213 * We have to do a stat to insure it's 3214 * not a directory or special file. 3215 */ 3216 if (simple || (stat(nbuf, &st) == 0 && 3217 S_ISREG(st.st_mode))) { 3218 if (dout == NULL) { 3219 dout = dataconn("file list", -1, "w"); 3220 if (dout == NULL) 3221 goto out; 3222 STARTXFER; 3223 } 3224 START_UNSAFE; 3225 if (nbuf[0] == '.' && nbuf[1] == '/') 3226 fprintf(dout, "%s%s\n", &nbuf[2], 3227 type == TYPE_A ? "\r" : ""); 3228 else 3229 fprintf(dout, "%s%s\n", nbuf, 3230 type == TYPE_A ? "\r" : ""); 3231 END_UNSAFE; 3232 if (ferror(dout)) 3233 goto data_err; 3234 byte_count += strlen(nbuf) + 3235 (type == TYPE_A ? 2 : 1); 3236 CHECKOOB(goto abrt); 3237 } 3238 } 3239 closedir(dirp); 3240 dirp = NULL; 3241 } 3242 3243 if (dout == NULL) 3244 reply(550, "No files found."); 3245 else if (ferror(dout)) 3246 data_err: perror_reply(550, "Data connection"); 3247 else 3248 reply(226, "Transfer complete."); 3249 out: 3250 if (dout) { 3251 ENDXFER; 3252 abrt: 3253 fclose(dout); 3254 data = -1; 3255 pdata = -1; 3256 } 3257 if (dirp) 3258 closedir(dirp); 3259 if (freeglob) { 3260 freeglob = 0; 3261 globfree(&gl); 3262 } 3263 } 3264 3265 void 3266 reapchild(int signo) 3267 { 3268 while (waitpid(-1, NULL, WNOHANG) > 0); 3269 } 3270 3271 #ifdef OLD_SETPROCTITLE 3272 /* 3273 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3274 * Warning, since this is usually started from inetd.conf, it often doesn't 3275 * have much of an environment or arglist to overwrite. 3276 */ 3277 void 3278 setproctitle(const char *fmt, ...) 3279 { 3280 int i; 3281 va_list ap; 3282 char *p, *bp, ch; 3283 char buf[LINE_MAX]; 3284 3285 va_start(ap, fmt); 3286 vsnprintf(buf, sizeof(buf), fmt, ap); 3287 3288 /* make ps print our process name */ 3289 p = Argv[0]; 3290 *p++ = '-'; 3291 3292 i = strlen(buf); 3293 if (i > LastArgv - p - 2) { 3294 i = LastArgv - p - 2; 3295 buf[i] = '\0'; 3296 } 3297 bp = buf; 3298 while (ch = *bp++) 3299 if (ch != '\n' && ch != '\r') 3300 *p++ = ch; 3301 while (p < LastArgv) 3302 *p++ = ' '; 3303 } 3304 #endif /* OLD_SETPROCTITLE */ 3305 3306 static void 3307 appendf(char **strp, char *fmt, ...) 3308 { 3309 va_list ap; 3310 char *ostr, *p; 3311 3312 va_start(ap, fmt); 3313 vasprintf(&p, fmt, ap); 3314 va_end(ap); 3315 if (p == NULL) 3316 fatalerror("Ran out of memory."); 3317 if (*strp == NULL) 3318 *strp = p; 3319 else { 3320 ostr = *strp; 3321 asprintf(strp, "%s%s", ostr, p); 3322 if (*strp == NULL) 3323 fatalerror("Ran out of memory."); 3324 free(ostr); 3325 } 3326 } 3327 3328 static void 3329 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3330 { 3331 char *msg = NULL; 3332 char wd[MAXPATHLEN + 1]; 3333 3334 if (logging <= 1) 3335 return; 3336 3337 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3338 strcpy(wd, strerror(errno)); 3339 3340 appendf(&msg, "%s", cmd); 3341 if (file1) 3342 appendf(&msg, " %s", file1); 3343 if (file2) 3344 appendf(&msg, " %s", file2); 3345 if (cnt >= 0) 3346 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3347 appendf(&msg, " (wd: %s", wd); 3348 if (guest || dochroot) 3349 appendf(&msg, "; chrooted"); 3350 appendf(&msg, ")"); 3351 syslog(LOG_INFO, "%s", msg); 3352 free(msg); 3353 } 3354 3355 static void 3356 logxfer(char *name, off_t size, time_t start) 3357 { 3358 char buf[MAXPATHLEN + 1024]; 3359 char path[MAXPATHLEN + 1]; 3360 time_t now; 3361 3362 if (statfd >= 0) { 3363 time(&now); 3364 if (realpath(name, path) == NULL) { 3365 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3366 return; 3367 } 3368 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3369 ctime(&now)+4, ident, remotehost, 3370 path, (intmax_t)size, 3371 (long)(now - start + (now == start))); 3372 write(statfd, buf, strlen(buf)); 3373 } 3374 } 3375 3376 static char * 3377 doublequote(char *s) 3378 { 3379 int n; 3380 char *p, *s2; 3381 3382 for (p = s, n = 0; *p; p++) 3383 if (*p == '"') 3384 n++; 3385 3386 if ((s2 = malloc(p - s + n + 1)) == NULL) 3387 return (NULL); 3388 3389 for (p = s2; *s; s++, p++) { 3390 if ((*p = *s) == '"') 3391 *(++p) = '"'; 3392 } 3393 *p = '\0'; 3394 3395 return (s2); 3396 } 3397 3398 /* setup server socket for specified address family */ 3399 /* if af is PF_UNSPEC more than one socket may be returned */ 3400 /* the returned list is dynamically allocated, so caller needs to free it */ 3401 static int * 3402 socksetup(int af, char *bindname, const char *bindport) 3403 { 3404 struct addrinfo hints, *res, *r; 3405 int error, maxs, *s, *socks; 3406 const int on = 1; 3407 3408 memset(&hints, 0, sizeof(hints)); 3409 hints.ai_flags = AI_PASSIVE; 3410 hints.ai_family = af; 3411 hints.ai_socktype = SOCK_STREAM; 3412 error = getaddrinfo(bindname, bindport, &hints, &res); 3413 if (error) { 3414 syslog(LOG_ERR, "%s", gai_strerror(error)); 3415 if (error == EAI_SYSTEM) 3416 syslog(LOG_ERR, "%s", strerror(errno)); 3417 return NULL; 3418 } 3419 3420 /* Count max number of sockets we may open */ 3421 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3422 ; 3423 socks = malloc((maxs + 1) * sizeof(int)); 3424 if (!socks) { 3425 freeaddrinfo(res); 3426 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3427 return NULL; 3428 } 3429 3430 *socks = 0; /* num of sockets counter at start of array */ 3431 s = socks + 1; 3432 for (r = res; r; r = r->ai_next) { 3433 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3434 if (*s < 0) { 3435 syslog(LOG_DEBUG, "control socket: %m"); 3436 continue; 3437 } 3438 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3439 &on, sizeof(on)) < 0) 3440 syslog(LOG_WARNING, 3441 "control setsockopt (SO_REUSEADDR): %m"); 3442 if (r->ai_family == AF_INET6) { 3443 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3444 &on, sizeof(on)) < 0) 3445 syslog(LOG_WARNING, 3446 "control setsockopt (IPV6_V6ONLY): %m"); 3447 } 3448 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3449 syslog(LOG_DEBUG, "control bind: %m"); 3450 close(*s); 3451 continue; 3452 } 3453 (*socks)++; 3454 s++; 3455 } 3456 3457 if (res) 3458 freeaddrinfo(res); 3459 3460 if (*socks == 0) { 3461 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3462 free(socks); 3463 return NULL; 3464 } 3465 return(socks); 3466 } 3467