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