1 /* 2 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)ftpd.c 8.4 (Berkeley) 4/16/94 30 * $FreeBSD: src/libexec/ftpd/ftpd.c,v 1.213 2008/12/23 01:23:09 cperciva Exp $ 31 */ 32 33 /* 34 * FTP server. 35 */ 36 #include <sys/param.h> 37 #include <sys/ioctl.h> 38 #include <sys/mman.h> 39 #include <sys/socket.h> 40 #include <sys/stat.h> 41 #include <sys/time.h> 42 #include <sys/wait.h> 43 44 #include <netinet/in.h> 45 #include <netinet/in_systm.h> 46 #include <netinet/ip.h> 47 #include <netinet/tcp.h> 48 49 #define FTP_NAMES 50 #include <arpa/ftp.h> 51 #include <arpa/inet.h> 52 #include <arpa/telnet.h> 53 54 #include <ctype.h> 55 #include <dirent.h> 56 #include <err.h> 57 #include <errno.h> 58 #include <fcntl.h> 59 #include <glob.h> 60 #include <limits.h> 61 #include <netdb.h> 62 #include <pwd.h> 63 #include <grp.h> 64 #include <opie.h> 65 #include <signal.h> 66 #include <stdint.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <syslog.h> 71 #include <time.h> 72 #include <unistd.h> 73 #include <libutil.h> 74 #ifdef LOGIN_CAP 75 #include <login_cap.h> 76 #endif 77 78 #ifdef USE_PAM 79 #include <security/pam_appl.h> 80 #endif 81 82 #include "pathnames.h" 83 #include "extern.h" 84 85 #include <stdarg.h> 86 87 static char version[] = "Version 6.00LS"; 88 #undef main 89 90 extern off_t restart_point; 91 extern char cbuf[]; 92 93 union sockunion ctrl_addr; 94 union sockunion data_source; 95 union sockunion data_dest; 96 union sockunion his_addr; 97 union sockunion pasv_addr; 98 99 int daemon_mode; 100 int data; 101 int dataport; 102 int hostinfo = 1; /* print host-specific info in messages */ 103 int logged_in; 104 struct passwd *pw; 105 char *homedir; 106 int ftpdebug; 107 int timeout = 900; /* timeout after 15 minutes of inactivity */ 108 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 109 int logging; 110 int restricted_data_ports = 1; 111 int paranoid = 1; /* be extra careful about security */ 112 int anon_only = 0; /* Only anonymous ftp allowed */ 113 int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 114 int guest; 115 int dochroot; 116 char *chrootdir; 117 int dowtmp = 1; 118 int stats; 119 int statfd = -1; 120 int type; 121 int form; 122 int stru; /* avoid C keyword */ 123 int mode; 124 int usedefault = 1; /* for data transfers */ 125 int pdata = -1; /* for passive mode */ 126 int readonly = 0; /* Server is in readonly mode. */ 127 int noepsv = 0; /* EPSV command is disabled. */ 128 int noretr = 0; /* RETR command is disabled. */ 129 int noguestretr = 0; /* RETR command is disabled for anon users. */ 130 int noguestmkd = 0; /* MKD command is disabled for anon users. */ 131 int noguestmod = 1; /* anon users may not modify existing files. */ 132 133 off_t file_size; 134 off_t byte_count; 135 #if !defined(CMASK) || CMASK == 0 136 #undef CMASK 137 #define CMASK 027 138 #endif 139 int defumask = CMASK; /* default umask value */ 140 char tmpline[7]; 141 char *hostname; 142 int epsvall = 0; 143 144 #ifdef VIRTUAL_HOSTING 145 char *ftpuser; 146 147 static struct ftphost { 148 struct ftphost *next; 149 struct addrinfo *hostinfo; 150 char *hostname; 151 char *anonuser; 152 char *statfile; 153 char *welcome; 154 char *loginmsg; 155 } *thishost, *firsthost; 156 157 #endif 158 char remotehost[NI_MAXHOST]; 159 char *ident = NULL; 160 161 static char ttyline[20]; 162 char *tty = ttyline; /* for klogin */ 163 164 #ifdef USE_PAM 165 static int auth_pam(struct passwd**, const char*); 166 pam_handle_t *pamh = NULL; 167 #endif 168 169 static struct opie opiedata; 170 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 171 static int pwok; 172 173 char *pid_file = NULL; /* means default location to pidfile(3) */ 174 175 /* 176 * Limit number of pathnames that glob can return. 177 * A limit of 0 indicates the number of pathnames is unlimited. 178 */ 179 #define MAXGLOBARGS 16384 180 181 /* 182 * Timeout intervals for retrying connections 183 * to hosts that don't accept PORT cmds. This 184 * is a kludge, but given the problems with TCP... 185 */ 186 #define SWAITMAX 90 /* wait at most 90 seconds */ 187 #define SWAITINT 5 /* interval between retries */ 188 189 int swaitmax = SWAITMAX; 190 int swaitint = SWAITINT; 191 192 #ifdef SETPROCTITLE 193 char proctitle[LINE_MAX]; /* initial part of title */ 194 #endif /* SETPROCTITLE */ 195 196 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 197 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 198 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 199 200 static volatile sig_atomic_t recvurg; 201 static int transflag; /* NB: for debugging only */ 202 203 #define STARTXFER flagxfer(1) 204 #define ENDXFER flagxfer(0) 205 206 #define START_UNSAFE maskurg(1) 207 #define END_UNSAFE maskurg(0) 208 209 /* It's OK to put an `else' clause after this macro. */ 210 #define CHECKOOB(action) \ 211 if (recvurg) { \ 212 recvurg = 0; \ 213 if (myoob()) { \ 214 ENDXFER; \ 215 action; \ 216 } \ 217 } 218 219 #ifdef VIRTUAL_HOSTING 220 static void inithosts(int); 221 static void selecthost(union sockunion *); 222 #endif 223 static void ack(char *); 224 static void sigurg(int); 225 static void maskurg(int); 226 static void flagxfer(int); 227 static int myoob(void); 228 static int checkuser(char *, char *, int, char **); 229 static FILE *dataconn(char *, off_t, char *); 230 static void dolog(struct sockaddr *); 231 static void end_login(void); 232 static FILE *getdatasock(char *); 233 static int guniquefd(char *, char **); 234 static void lostconn(int); 235 static void sigquit(int); 236 static int receive_data(FILE *, FILE *); 237 static int send_data(FILE *, FILE *, size_t, off_t, int); 238 static struct passwd * 239 sgetpwnam(char *); 240 static char *sgetsave(char *); 241 static void reapchild(int); 242 static void appendf(char **, char *, ...) __printflike(2, 3); 243 static void logcmd(char *, char *, char *, off_t); 244 static void logxfer(char *, off_t, time_t); 245 static char *doublequote(char *); 246 static int *socksetup(int, char *, const char *); 247 248 int 249 main(int argc, char *argv[]) 250 { 251 socklen_t addrlen; 252 int ch, on = 1, tos; 253 char *cp, line[LINE_MAX]; 254 FILE *fd; 255 char *bindname = NULL; 256 const char *bindport = "ftp"; 257 int family = AF_UNSPEC; 258 struct sigaction sa; 259 260 tzset(); /* in case no timezone database in ~ftp */ 261 sigemptyset(&sa.sa_mask); 262 sa.sa_flags = SA_RESTART; 263 264 /* 265 * Prevent diagnostic messages from appearing on stderr. 266 * We run as a daemon or from inetd; in both cases, there's 267 * more reason in logging to syslog. 268 */ 269 freopen(_PATH_DEVNULL, "w", stderr); 270 opterr = 0; 271 272 /* 273 * LOG_NDELAY sets up the logging connection immediately, 274 * necessary for anonymous ftp's that chroot and can't do it later. 275 */ 276 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 277 278 while ((ch = getopt(argc, argv, 279 "468a:AdDEH:hlmMoOp:P:rRSt:T:u:UvW")) != -1) { 280 switch (ch) { 281 case '4': 282 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 283 break; 284 285 case '6': 286 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 287 break; 288 289 case '8': 290 assumeutf8 = 1; 291 break; 292 293 case 'a': 294 bindname = optarg; 295 break; 296 297 case 'A': 298 anon_only = 1; 299 break; 300 301 case 'd': 302 ftpdebug++; 303 break; 304 305 case 'D': 306 daemon_mode++; 307 break; 308 309 case 'E': 310 noepsv = 1; 311 break; 312 313 case 'h': 314 hostinfo = 0; 315 break; 316 317 case 'H': 318 hostname = optarg; 319 break; 320 321 case 'l': 322 logging++; /* > 1 == extra logging */ 323 break; 324 325 case 'm': 326 noguestmod = 0; 327 break; 328 329 case 'M': 330 noguestmkd = 1; 331 break; 332 333 case 'o': 334 noretr = 1; 335 break; 336 337 case 'O': 338 noguestretr = 1; 339 break; 340 341 case 'p': 342 pid_file = optarg; 343 break; 344 345 case 'P': 346 bindport = optarg; 347 break; 348 349 case 'r': 350 readonly = 1; 351 break; 352 353 case 'R': 354 paranoid = 0; 355 break; 356 357 case 'S': 358 stats++; 359 break; 360 361 case 't': 362 timeout = atoi(optarg); 363 if (maxtimeout < timeout) 364 maxtimeout = timeout; 365 break; 366 367 case 'T': 368 maxtimeout = atoi(optarg); 369 if (timeout > maxtimeout) 370 timeout = maxtimeout; 371 break; 372 373 case 'u': 374 { 375 long val = 0; 376 377 val = strtol(optarg, &optarg, 8); 378 if (*optarg != '\0' || val < 0) 379 syslog(LOG_WARNING, "bad value for -u"); 380 else 381 defumask = val; 382 break; 383 } 384 case 'U': 385 restricted_data_ports = 0; 386 break; 387 388 case 'v': 389 ftpdebug++; 390 break; 391 392 case 'W': 393 dowtmp = 0; 394 break; 395 396 default: 397 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 398 break; 399 } 400 } 401 402 if (daemon_mode) { 403 int *ctl_sock, fd, maxfd = -1, nfds, i; 404 fd_set defreadfds, readfds; 405 pid_t pid; 406 struct pidfh *pfh; 407 408 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) { 409 if (errno == EEXIST) { 410 syslog(LOG_ERR, "%s already running, pid %d", 411 getprogname(), (int)pid); 412 exit(1); 413 } 414 syslog(LOG_WARNING, "pidfile_open: %m"); 415 } 416 417 /* 418 * Detach from parent. 419 */ 420 if (daemon(1, 1) < 0) { 421 syslog(LOG_ERR, "failed to become a daemon"); 422 exit(1); 423 } 424 425 if (pfh != NULL && pidfile_write(pfh) == -1) 426 syslog(LOG_WARNING, "pidfile_write: %m"); 427 428 sa.sa_handler = reapchild; 429 sigaction(SIGCHLD, &sa, NULL); 430 431 #ifdef VIRTUAL_HOSTING 432 inithosts(family); 433 #endif 434 435 /* 436 * Open a socket, bind it to the FTP port, and start 437 * listening. 438 */ 439 ctl_sock = socksetup(family, bindname, bindport); 440 if (ctl_sock == NULL) 441 exit(1); 442 443 FD_ZERO(&defreadfds); 444 for (i = 1; i <= *ctl_sock; i++) { 445 FD_SET(ctl_sock[i], &defreadfds); 446 if (listen(ctl_sock[i], 32) < 0) { 447 syslog(LOG_ERR, "control listen: %m"); 448 exit(1); 449 } 450 if (maxfd < ctl_sock[i]) 451 maxfd = ctl_sock[i]; 452 } 453 454 /* 455 * Loop forever accepting connection requests and forking off 456 * children to handle them. 457 */ 458 while (1) { 459 FD_COPY(&defreadfds, &readfds); 460 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 461 if (nfds <= 0) { 462 if (nfds < 0 && errno != EINTR) 463 syslog(LOG_WARNING, "select: %m"); 464 continue; 465 } 466 467 pid = -1; 468 for (i = 1; i <= *ctl_sock; i++) 469 if (FD_ISSET(ctl_sock[i], &readfds)) { 470 addrlen = sizeof(his_addr); 471 fd = accept(ctl_sock[i], 472 (struct sockaddr *)&his_addr, 473 &addrlen); 474 if (fd == -1) { 475 syslog(LOG_WARNING, 476 "accept: %m"); 477 continue; 478 } 479 switch (pid = fork()) { 480 case 0: 481 /* child */ 482 dup2(fd, 0); 483 dup2(fd, 1); 484 close(fd); 485 for (i = 1; i <= *ctl_sock; i++) 486 close(ctl_sock[i]); 487 if (pfh != NULL) 488 pidfile_close(pfh); 489 goto gotchild; 490 case -1: 491 syslog(LOG_WARNING, "fork: %m"); 492 /* FALLTHROUGH */ 493 default: 494 close(fd); 495 } 496 } 497 } 498 } else { 499 addrlen = sizeof(his_addr); 500 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 501 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 502 exit(1); 503 } 504 505 #ifdef VIRTUAL_HOSTING 506 if (his_addr.su_family == AF_INET6 && 507 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 508 family = AF_INET; 509 else 510 family = his_addr.su_family; 511 inithosts(family); 512 #endif 513 } 514 515 gotchild: 516 sa.sa_handler = SIG_DFL; 517 sigaction(SIGCHLD, &sa, NULL); 518 519 sa.sa_handler = sigurg; 520 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 521 sigaction(SIGURG, &sa, NULL); 522 523 sigfillset(&sa.sa_mask); /* block all signals in handler */ 524 sa.sa_flags = SA_RESTART; 525 sa.sa_handler = sigquit; 526 sigaction(SIGHUP, &sa, NULL); 527 sigaction(SIGINT, &sa, NULL); 528 sigaction(SIGQUIT, &sa, NULL); 529 sigaction(SIGTERM, &sa, NULL); 530 531 sa.sa_handler = lostconn; 532 sigaction(SIGPIPE, &sa, NULL); 533 534 addrlen = sizeof(ctrl_addr); 535 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 536 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 537 exit(1); 538 } 539 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 540 #ifdef VIRTUAL_HOSTING 541 /* select our identity from virtual host table */ 542 selecthost(&ctrl_addr); 543 #endif 544 #ifdef IP_TOS 545 if (ctrl_addr.su_family == AF_INET) 546 { 547 tos = IPTOS_LOWDELAY; 548 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 549 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 550 } 551 #endif 552 /* 553 * Disable Nagle on the control channel so that we don't have to wait 554 * for peer's ACK before issuing our next reply. 555 */ 556 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 557 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 558 559 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 560 561 /* set this here so klogin can use it... */ 562 snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 563 564 /* Try to handle urgent data inline */ 565 #ifdef SO_OOBINLINE 566 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 567 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 568 #endif 569 570 #ifdef F_SETOWN 571 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 572 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 573 #endif 574 dolog((struct sockaddr *)&his_addr); 575 /* 576 * Set up default state 577 */ 578 data = -1; 579 type = TYPE_A; 580 form = FORM_N; 581 stru = STRU_F; 582 mode = MODE_S; 583 tmpline[0] = '\0'; 584 585 /* If logins are disabled, print out the message. */ 586 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 587 while (fgets(line, sizeof(line), fd) != NULL) { 588 if ((cp = strchr(line, '\n')) != NULL) 589 *cp = '\0'; 590 lreply(530, "%s", line); 591 } 592 fflush(stdout); 593 fclose(fd); 594 reply(530, "System not available."); 595 exit(0); 596 } 597 #ifdef VIRTUAL_HOSTING 598 fd = fopen(thishost->welcome, "r"); 599 #else 600 fd = fopen(_PATH_FTPWELCOME, "r"); 601 #endif 602 if (fd != NULL) { 603 while (fgets(line, sizeof(line), fd) != NULL) { 604 if ((cp = strchr(line, '\n')) != NULL) 605 *cp = '\0'; 606 lreply(220, "%s", line); 607 } 608 fflush(stdout); 609 fclose(fd); 610 /* reply(220,) must follow */ 611 } 612 #ifndef VIRTUAL_HOSTING 613 if (hostname == NULL) { 614 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 615 fatalerror("Ran out of memory."); 616 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 617 hostname[0] = '\0'; 618 hostname[MAXHOSTNAMELEN - 1] = '\0'; 619 } 620 #endif 621 if (hostinfo) 622 reply(220, "%s FTP server (%s) ready.", hostname, version); 623 else 624 reply(220, "FTP server ready."); 625 for (;;) 626 yyparse(); 627 /* NOTREACHED */ 628 } 629 630 static void 631 lostconn(int signo) 632 { 633 634 if (ftpdebug) 635 syslog(LOG_DEBUG, "lost connection"); 636 dologout(1); 637 } 638 639 static void 640 sigquit(int signo) 641 { 642 643 syslog(LOG_ERR, "got signal %d", signo); 644 dologout(1); 645 } 646 647 #ifdef VIRTUAL_HOSTING 648 /* 649 * read in virtual host tables (if they exist) 650 */ 651 652 static void 653 inithosts(int family) 654 { 655 int insert; 656 size_t len; 657 FILE *fp; 658 char *cp, *mp, *line; 659 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 660 struct ftphost *hrp, *lhrp; 661 struct addrinfo hints, *res, *ai; 662 663 /* 664 * Fill in the default host information 665 */ 666 if (hostname == NULL) { 667 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 668 fatalerror("Ran out of memory."); 669 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 670 hostname[0] = '\0'; 671 hostname[MAXHOSTNAMELEN - 1] = '\0'; 672 } 673 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 674 fatalerror("Ran out of memory."); 675 hrp->hostname = hostname; 676 hrp->hostinfo = NULL; 677 678 memset(&hints, 0, sizeof(hints)); 679 hints.ai_flags = AI_PASSIVE; 680 hints.ai_family = family; 681 hints.ai_socktype = SOCK_STREAM; 682 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 683 hrp->hostinfo = res; 684 hrp->statfile = _PATH_FTPDSTATFILE; 685 hrp->welcome = _PATH_FTPWELCOME; 686 hrp->loginmsg = _PATH_FTPLOGINMESG; 687 hrp->anonuser = "ftp"; 688 hrp->next = NULL; 689 thishost = firsthost = lhrp = hrp; 690 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 691 int addrsize, gothost; 692 void *addr; 693 struct hostent *hp; 694 695 while ((line = fgetln(fp, &len)) != NULL) { 696 int i, hp_error; 697 698 /* skip comments */ 699 if (line[0] == '#') 700 continue; 701 if (line[len - 1] == '\n') { 702 line[len - 1] = '\0'; 703 mp = NULL; 704 } else { 705 if ((mp = malloc(len + 1)) == NULL) 706 fatalerror("Ran out of memory."); 707 memcpy(mp, line, len); 708 mp[len] = '\0'; 709 line = mp; 710 } 711 cp = strtok(line, " \t"); 712 /* skip empty lines */ 713 if (cp == NULL) 714 goto nextline; 715 vhost = cp; 716 717 /* set defaults */ 718 anonuser = "ftp"; 719 statfile = _PATH_FTPDSTATFILE; 720 welcome = _PATH_FTPWELCOME; 721 loginmsg = _PATH_FTPLOGINMESG; 722 723 /* 724 * Preparse the line so we can use its info 725 * for all the addresses associated with 726 * the virtual host name. 727 * Field 0, the virtual host name, is special: 728 * it's already parsed off and will be strdup'ed 729 * later, after we know its canonical form. 730 */ 731 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 732 if (*cp != '-' && (cp = strdup(cp))) 733 switch (i) { 734 case 1: /* anon user permissions */ 735 anonuser = cp; 736 break; 737 case 2: /* statistics file */ 738 statfile = cp; 739 break; 740 case 3: /* welcome message */ 741 welcome = cp; 742 break; 743 case 4: /* login message */ 744 loginmsg = cp; 745 break; 746 default: /* programming error */ 747 abort(); 748 /* NOTREACHED */ 749 } 750 751 hints.ai_flags = AI_PASSIVE; 752 hints.ai_family = family; 753 hints.ai_socktype = SOCK_STREAM; 754 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 755 goto nextline; 756 for (ai = res; ai != NULL && ai->ai_addr != NULL; 757 ai = ai->ai_next) { 758 759 gothost = 0; 760 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 761 struct addrinfo *hi; 762 763 for (hi = hrp->hostinfo; hi != NULL; 764 hi = hi->ai_next) 765 if (hi->ai_addrlen == ai->ai_addrlen && 766 memcmp(hi->ai_addr, 767 ai->ai_addr, 768 ai->ai_addr->sa_len) == 0) { 769 gothost++; 770 break; 771 } 772 if (gothost) 773 break; 774 } 775 if (hrp == NULL) { 776 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 777 goto nextline; 778 hrp->hostname = NULL; 779 insert = 1; 780 } else { 781 if (hrp->hostinfo && hrp->hostinfo != res) 782 freeaddrinfo(hrp->hostinfo); 783 insert = 0; /* host already in the chain */ 784 } 785 hrp->hostinfo = res; 786 787 /* 788 * determine hostname to use. 789 * force defined name if there is a valid alias 790 * otherwise fallback to primary hostname 791 */ 792 /* XXX: getaddrinfo() can't do alias check */ 793 switch(hrp->hostinfo->ai_family) { 794 case AF_INET: 795 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 796 addrsize = sizeof(struct in_addr); 797 break; 798 case AF_INET6: 799 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 800 addrsize = sizeof(struct in6_addr); 801 break; 802 default: 803 /* should not reach here */ 804 freeaddrinfo(hrp->hostinfo); 805 if (insert) 806 free(hrp); /*not in chain, can free*/ 807 else 808 hrp->hostinfo = NULL; /*mark as blank*/ 809 goto nextline; 810 /* NOTREACHED */ 811 } 812 if ((hp = getipnodebyaddr(addr, addrsize, 813 hrp->hostinfo->ai_family, 814 &hp_error)) != NULL) { 815 if (strcmp(vhost, hp->h_name) != 0) { 816 if (hp->h_aliases == NULL) 817 vhost = hp->h_name; 818 else { 819 i = 0; 820 while (hp->h_aliases[i] && 821 strcmp(vhost, hp->h_aliases[i]) != 0) 822 ++i; 823 if (hp->h_aliases[i] == NULL) 824 vhost = hp->h_name; 825 } 826 } 827 } 828 if (hrp->hostname && 829 strcmp(hrp->hostname, vhost) != 0) { 830 free(hrp->hostname); 831 hrp->hostname = NULL; 832 } 833 if (hrp->hostname == NULL && 834 (hrp->hostname = strdup(vhost)) == NULL) { 835 freeaddrinfo(hrp->hostinfo); 836 hrp->hostinfo = NULL; /* mark as blank */ 837 if (hp) 838 freehostent(hp); 839 goto nextline; 840 } 841 hrp->anonuser = anonuser; 842 hrp->statfile = statfile; 843 hrp->welcome = welcome; 844 hrp->loginmsg = loginmsg; 845 if (insert) { 846 hrp->next = NULL; 847 lhrp->next = hrp; 848 lhrp = hrp; 849 } 850 if (hp) 851 freehostent(hp); 852 } 853 nextline: 854 if (mp) 855 free(mp); 856 } 857 fclose(fp); 858 } 859 } 860 861 static void 862 selecthost(union sockunion *su) 863 { 864 struct ftphost *hrp; 865 u_int16_t port; 866 #ifdef INET6 867 struct in6_addr *mapped_in6 = NULL; 868 #endif 869 struct addrinfo *hi; 870 871 #ifdef INET6 872 /* 873 * XXX IPv4 mapped IPv6 addr consideraton, 874 * specified in rfc2373. 875 */ 876 if (su->su_family == AF_INET6 && 877 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 878 mapped_in6 = &su->su_sin6.sin6_addr; 879 #endif 880 881 hrp = thishost = firsthost; /* default */ 882 port = su->su_port; 883 su->su_port = 0; 884 while (hrp != NULL) { 885 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 886 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 887 thishost = hrp; 888 goto found; 889 } 890 #ifdef INET6 891 /* XXX IPv4 mapped IPv6 addr consideraton */ 892 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 893 (memcmp(&mapped_in6->s6_addr[12], 894 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 895 sizeof(struct in_addr)) == 0)) { 896 thishost = hrp; 897 goto found; 898 } 899 #endif 900 } 901 hrp = hrp->next; 902 } 903 found: 904 su->su_port = port; 905 /* setup static variables as appropriate */ 906 hostname = thishost->hostname; 907 ftpuser = thishost->anonuser; 908 } 909 #endif 910 911 /* 912 * Helper function for sgetpwnam(). 913 */ 914 static char * 915 sgetsave(char *s) 916 { 917 char *new = malloc(strlen(s) + 1); 918 919 if (new == NULL) { 920 reply(421, "Ran out of memory."); 921 dologout(1); 922 /* NOTREACHED */ 923 } 924 strcpy(new, s); 925 return (new); 926 } 927 928 /* 929 * Save the result of a getpwnam. Used for USER command, since 930 * the data returned must not be clobbered by any other command 931 * (e.g., globbing). 932 * NB: The data returned by sgetpwnam() will remain valid until 933 * the next call to this function. Its difference from getpwnam() 934 * is that sgetpwnam() is known to be called from ftpd code only. 935 */ 936 static struct passwd * 937 sgetpwnam(char *name) 938 { 939 static struct passwd save; 940 struct passwd *p; 941 942 if ((p = getpwnam(name)) == NULL) 943 return (p); 944 if (save.pw_name) { 945 free(save.pw_name); 946 free(save.pw_passwd); 947 free(save.pw_gecos); 948 free(save.pw_dir); 949 free(save.pw_shell); 950 } 951 save = *p; 952 save.pw_name = sgetsave(p->pw_name); 953 save.pw_passwd = sgetsave(p->pw_passwd); 954 save.pw_gecos = sgetsave(p->pw_gecos); 955 save.pw_dir = sgetsave(p->pw_dir); 956 save.pw_shell = sgetsave(p->pw_shell); 957 return (&save); 958 } 959 960 static int login_attempts; /* number of failed login attempts */ 961 static int askpasswd; /* had user command, ask for passwd */ 962 static char curname[MAXLOGNAME]; /* current USER name */ 963 964 /* 965 * USER command. 966 * Sets global passwd pointer pw if named account exists and is acceptable; 967 * sets askpasswd if a PASS command is expected. If logged in previously, 968 * need to reset state. If name is "ftp" or "anonymous", the name is not in 969 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 970 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 971 * requesting login privileges. Disallow anyone who does not have a standard 972 * shell as returned by getusershell(). Disallow anyone mentioned in the file 973 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 974 */ 975 void 976 user(char *name) 977 { 978 char *cp, *shell; 979 980 if (logged_in) { 981 if (guest) { 982 reply(530, "Can't change user from guest login."); 983 return; 984 } else if (dochroot) { 985 reply(530, "Can't change user from chroot user."); 986 return; 987 } 988 end_login(); 989 } 990 991 guest = 0; 992 #ifdef VIRTUAL_HOSTING 993 pw = sgetpwnam(thishost->anonuser); 994 #else 995 pw = sgetpwnam("ftp"); 996 #endif 997 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 998 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 999 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 1000 reply(530, "User %s access denied.", name); 1001 else if (pw != NULL) { 1002 guest = 1; 1003 askpasswd = 1; 1004 reply(331, 1005 "Guest login ok, send your email address as password."); 1006 } else 1007 reply(530, "User %s unknown.", name); 1008 if (!askpasswd && logging) 1009 syslog(LOG_NOTICE, 1010 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1011 return; 1012 } 1013 if (anon_only != 0) { 1014 reply(530, "Sorry, only anonymous ftp allowed."); 1015 return; 1016 } 1017 1018 if ((pw = sgetpwnam(name))) { 1019 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1020 shell = _PATH_BSHELL; 1021 setusershell(); 1022 while ((cp = getusershell()) != NULL) 1023 if (strcmp(cp, shell) == 0) 1024 break; 1025 endusershell(); 1026 1027 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1028 reply(530, "User %s access denied.", name); 1029 if (logging) 1030 syslog(LOG_NOTICE, 1031 "FTP LOGIN REFUSED FROM %s, %s", 1032 remotehost, name); 1033 pw = NULL; 1034 return; 1035 } 1036 } 1037 if (logging) 1038 strncpy(curname, name, sizeof(curname)-1); 1039 1040 pwok = 0; 1041 #ifdef USE_PAM 1042 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1043 #endif 1044 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1045 pwok = (pw != NULL) && 1046 opieaccessfile(remotehost) && 1047 opiealways(pw->pw_dir); 1048 reply(331, "Response to %s %s for %s.", 1049 opieprompt, pwok ? "requested" : "required", name); 1050 } else { 1051 pwok = 1; 1052 reply(331, "Password required for %s.", name); 1053 } 1054 askpasswd = 1; 1055 /* 1056 * Delay before reading passwd after first failed 1057 * attempt to slow down passwd-guessing programs. 1058 */ 1059 if (login_attempts) 1060 sleep(login_attempts); 1061 } 1062 1063 /* 1064 * Check if a user is in the file "fname", 1065 * return a pointer to a malloc'd string with the rest 1066 * of the matching line in "residue" if not NULL. 1067 */ 1068 static int 1069 checkuser(char *fname, char *name, int pwset, char **residue) 1070 { 1071 FILE *fd; 1072 int found = 0; 1073 size_t len; 1074 char *line, *mp, *p; 1075 1076 if ((fd = fopen(fname, "r")) != NULL) { 1077 while (!found && (line = fgetln(fd, &len)) != NULL) { 1078 /* skip comments */ 1079 if (line[0] == '#') 1080 continue; 1081 if (line[len - 1] == '\n') { 1082 line[len - 1] = '\0'; 1083 mp = NULL; 1084 } else { 1085 if ((mp = malloc(len + 1)) == NULL) 1086 fatalerror("Ran out of memory."); 1087 memcpy(mp, line, len); 1088 mp[len] = '\0'; 1089 line = mp; 1090 } 1091 /* avoid possible leading and trailing whitespace */ 1092 p = strtok(line, " \t"); 1093 /* skip empty lines */ 1094 if (p == NULL) 1095 goto nextline; 1096 /* 1097 * if first chr is '@', check group membership 1098 */ 1099 if (p[0] == '@') { 1100 int i = 0; 1101 struct group *grp; 1102 1103 if (p[1] == '\0') /* single @ matches anyone */ 1104 found = 1; 1105 else { 1106 if ((grp = getgrnam(p+1)) == NULL) 1107 goto nextline; 1108 /* 1109 * Check user's default group 1110 */ 1111 if (pwset && grp->gr_gid == pw->pw_gid) 1112 found = 1; 1113 /* 1114 * Check supplementary groups 1115 */ 1116 while (!found && grp->gr_mem[i]) 1117 found = strcmp(name, 1118 grp->gr_mem[i++]) 1119 == 0; 1120 } 1121 } 1122 /* 1123 * Otherwise, just check for username match 1124 */ 1125 else 1126 found = strcmp(p, name) == 0; 1127 /* 1128 * Save the rest of line to "residue" if matched 1129 */ 1130 if (found && residue) { 1131 if ((p = strtok(NULL, "")) != NULL) 1132 p += strspn(p, " \t"); 1133 if (p && *p) { 1134 if ((*residue = strdup(p)) == NULL) 1135 fatalerror("Ran out of memory."); 1136 } else 1137 *residue = NULL; 1138 } 1139 nextline: 1140 if (mp) 1141 free(mp); 1142 } 1143 fclose(fd); 1144 } 1145 return (found); 1146 } 1147 1148 /* 1149 * Terminate login as previous user, if any, resetting state; 1150 * used when USER command is given or login fails. 1151 */ 1152 static void 1153 end_login(void) 1154 { 1155 #ifdef USE_PAM 1156 int e; 1157 #endif 1158 1159 seteuid(0); 1160 if (logged_in && dowtmp) 1161 ftpd_logwtmp(ttyline, "", NULL); 1162 pw = NULL; 1163 #ifdef LOGIN_CAP 1164 /* XXX Missing LOGIN_SETMAC */ 1165 setusercontext(NULL, getpwuid(0), 0, 1166 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1167 #endif 1168 #ifdef USE_PAM 1169 if (pamh) { 1170 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1171 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1172 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1173 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1174 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1175 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1176 pamh = NULL; 1177 } 1178 #endif 1179 logged_in = 0; 1180 guest = 0; 1181 dochroot = 0; 1182 } 1183 1184 #ifdef USE_PAM 1185 1186 /* 1187 * the following code is stolen from imap-uw PAM authentication module and 1188 * login.c 1189 */ 1190 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1191 1192 struct cred_t { 1193 const char *uname; /* user name */ 1194 const char *pass; /* password */ 1195 }; 1196 typedef struct cred_t cred_t; 1197 1198 static int 1199 auth_conv(int num_msg, const struct pam_message **msg, 1200 struct pam_response **resp, void *appdata) 1201 { 1202 int i; 1203 cred_t *cred = (cred_t *) appdata; 1204 struct pam_response *reply; 1205 1206 reply = calloc(num_msg, sizeof *reply); 1207 if (reply == NULL) 1208 return PAM_BUF_ERR; 1209 1210 for (i = 0; i < num_msg; i++) { 1211 switch (msg[i]->msg_style) { 1212 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1213 reply[i].resp_retcode = PAM_SUCCESS; 1214 reply[i].resp = COPY_STRING(cred->uname); 1215 /* PAM frees resp. */ 1216 break; 1217 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1218 reply[i].resp_retcode = PAM_SUCCESS; 1219 reply[i].resp = COPY_STRING(cred->pass); 1220 /* PAM frees resp. */ 1221 break; 1222 case PAM_TEXT_INFO: 1223 case PAM_ERROR_MSG: 1224 reply[i].resp_retcode = PAM_SUCCESS; 1225 reply[i].resp = NULL; 1226 break; 1227 default: /* unknown message style */ 1228 free(reply); 1229 return PAM_CONV_ERR; 1230 } 1231 } 1232 1233 *resp = reply; 1234 return PAM_SUCCESS; 1235 } 1236 1237 /* 1238 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1239 * authenticated, or 1 if not authenticated. If some sort of PAM system 1240 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1241 * function returns -1. This can be used as an indication that we should 1242 * fall back to a different authentication mechanism. 1243 */ 1244 static int 1245 auth_pam(struct passwd **ppw, const char *pass) 1246 { 1247 const char *tmpl_user; 1248 const void *item; 1249 int rval; 1250 int e; 1251 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1252 struct pam_conv conv = { &auth_conv, &auth_cred }; 1253 1254 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1255 if (e != PAM_SUCCESS) { 1256 /* 1257 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1258 * if context creation has failed in the first place. 1259 */ 1260 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1261 return -1; 1262 } 1263 1264 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1265 if (e != PAM_SUCCESS) { 1266 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1267 pam_strerror(pamh, e)); 1268 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1269 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1270 } 1271 pamh = NULL; 1272 return -1; 1273 } 1274 1275 e = pam_authenticate(pamh, 0); 1276 switch (e) { 1277 case PAM_SUCCESS: 1278 /* 1279 * With PAM we support the concept of a "template" 1280 * user. The user enters a login name which is 1281 * authenticated by PAM, usually via a remote service 1282 * such as RADIUS or TACACS+. If authentication 1283 * succeeds, a different but related "template" name 1284 * is used for setting the credentials, shell, and 1285 * home directory. The name the user enters need only 1286 * exist on the remote authentication server, but the 1287 * template name must be present in the local password 1288 * database. 1289 * 1290 * This is supported by two various mechanisms in the 1291 * individual modules. However, from the application's 1292 * point of view, the template user is always passed 1293 * back as a changed value of the PAM_USER item. 1294 */ 1295 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1296 PAM_SUCCESS) { 1297 tmpl_user = (const char *) item; 1298 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1299 *ppw = getpwnam(tmpl_user); 1300 } else 1301 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1302 pam_strerror(pamh, e)); 1303 rval = 0; 1304 break; 1305 1306 case PAM_AUTH_ERR: 1307 case PAM_USER_UNKNOWN: 1308 case PAM_MAXTRIES: 1309 rval = 1; 1310 break; 1311 1312 default: 1313 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1314 rval = -1; 1315 break; 1316 } 1317 1318 if (rval == 0) { 1319 e = pam_acct_mgmt(pamh, 0); 1320 if (e != PAM_SUCCESS) { 1321 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1322 pam_strerror(pamh, e)); 1323 rval = 1; 1324 } 1325 } 1326 1327 if (rval != 0) { 1328 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1329 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1330 } 1331 pamh = NULL; 1332 } 1333 return rval; 1334 } 1335 1336 #endif /* USE_PAM */ 1337 1338 void 1339 pass(char *passwd) 1340 { 1341 int rval; 1342 FILE *fd; 1343 #ifdef LOGIN_CAP 1344 login_cap_t *lc = NULL; 1345 #endif 1346 #ifdef USE_PAM 1347 int e; 1348 #endif 1349 char *residue = NULL; 1350 char *xpasswd; 1351 1352 if (logged_in || askpasswd == 0) { 1353 reply(503, "Login with USER first."); 1354 return; 1355 } 1356 askpasswd = 0; 1357 if (!guest) { /* "ftp" is only account allowed no password */ 1358 if (pw == NULL) { 1359 rval = 1; /* failure below */ 1360 goto skip; 1361 } 1362 #ifdef USE_PAM 1363 rval = auth_pam(&pw, passwd); 1364 if (rval >= 0) { 1365 opieunlock(); 1366 goto skip; 1367 } 1368 #endif 1369 if (opieverify(&opiedata, passwd) == 0) 1370 xpasswd = pw->pw_passwd; 1371 else if (pwok) { 1372 xpasswd = crypt(passwd, pw->pw_passwd); 1373 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1374 xpasswd = ":"; 1375 } else { 1376 rval = 1; 1377 goto skip; 1378 } 1379 rval = strcmp(pw->pw_passwd, xpasswd); 1380 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1381 rval = 1; /* failure */ 1382 skip: 1383 /* 1384 * If rval == 1, the user failed the authentication check 1385 * above. If rval == 0, either PAM or local authentication 1386 * succeeded. 1387 */ 1388 if (rval) { 1389 reply(530, "Login incorrect."); 1390 if (logging) { 1391 syslog(LOG_NOTICE, 1392 "FTP LOGIN FAILED FROM %s", 1393 remotehost); 1394 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1395 "FTP LOGIN FAILED FROM %s, %s", 1396 remotehost, curname); 1397 } 1398 pw = NULL; 1399 if (login_attempts++ >= 5) { 1400 syslog(LOG_NOTICE, 1401 "repeated login failures from %s", 1402 remotehost); 1403 exit(0); 1404 } 1405 return; 1406 } 1407 } 1408 login_attempts = 0; /* this time successful */ 1409 if (setegid(pw->pw_gid) < 0) { 1410 reply(550, "Can't set gid."); 1411 return; 1412 } 1413 /* May be overridden by login.conf */ 1414 umask(defumask); 1415 #ifdef LOGIN_CAP 1416 if ((lc = login_getpwclass(pw)) != NULL) { 1417 char remote_ip[NI_MAXHOST]; 1418 1419 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1420 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1421 NI_NUMERICHOST)) 1422 *remote_ip = 0; 1423 remote_ip[sizeof(remote_ip) - 1] = 0; 1424 if (!auth_hostok(lc, remotehost, remote_ip)) { 1425 syslog(LOG_INFO|LOG_AUTH, 1426 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1427 pw->pw_name); 1428 reply(530, "Permission denied."); 1429 pw = NULL; 1430 return; 1431 } 1432 if (!auth_timeok(lc, time(NULL))) { 1433 reply(530, "Login not available right now."); 1434 pw = NULL; 1435 return; 1436 } 1437 } 1438 /* XXX Missing LOGIN_SETMAC */ 1439 setusercontext(lc, pw, 0, 1440 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1441 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1442 #else 1443 setlogin(pw->pw_name); 1444 initgroups(pw->pw_name, pw->pw_gid); 1445 #endif 1446 1447 #ifdef USE_PAM 1448 if (pamh) { 1449 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1450 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1451 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1452 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1453 } 1454 } 1455 #endif 1456 1457 /* open wtmp before chroot */ 1458 if (dowtmp) 1459 ftpd_logwtmp(ttyline, pw->pw_name, 1460 (struct sockaddr *)&his_addr); 1461 logged_in = 1; 1462 1463 if (guest && stats && statfd < 0) 1464 #ifdef VIRTUAL_HOSTING 1465 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1466 #else 1467 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1468 #endif 1469 if (statfd < 0) 1470 stats = 0; 1471 1472 dochroot = 1473 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1474 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1475 || login_getcapbool(lc, "ftp-chroot", 0) 1476 #endif 1477 ; 1478 chrootdir = NULL; 1479 /* 1480 * For a chrooted local user, 1481 * a) see whether ftpchroot(5) specifies a chroot directory, 1482 * b) extract the directory pathname from the line, 1483 * c) expand it to the absolute pathname if necessary. 1484 */ 1485 if (dochroot && residue && 1486 (chrootdir = strtok(residue, " \t")) != NULL) { 1487 if (chrootdir[0] != '/') 1488 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1489 else 1490 chrootdir = strdup(chrootdir); /* make it permanent */ 1491 if (chrootdir == NULL) 1492 fatalerror("Ran out of memory."); 1493 } 1494 if (guest || dochroot) { 1495 /* 1496 * If no chroot directory set yet, use the login directory. 1497 * Copy it so it can be modified while pw->pw_dir stays intact. 1498 */ 1499 if (chrootdir == NULL && 1500 (chrootdir = strdup(pw->pw_dir)) == NULL) 1501 fatalerror("Ran out of memory."); 1502 /* 1503 * Check for the "/chroot/./home" syntax, 1504 * separate the chroot and home directory pathnames. 1505 */ 1506 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1507 *(homedir++) = '\0'; /* wipe '/' */ 1508 homedir++; /* skip '.' */ 1509 } else { 1510 /* 1511 * We MUST do a chdir() after the chroot. Otherwise 1512 * the old current directory will be accessible as "." 1513 * outside the new root! 1514 */ 1515 homedir = "/"; 1516 } 1517 /* 1518 * Finally, do chroot() 1519 */ 1520 if (chroot(chrootdir) < 0) { 1521 reply(550, "Can't change root."); 1522 goto bad; 1523 } 1524 } else /* real user w/o chroot */ 1525 homedir = pw->pw_dir; 1526 /* 1527 * Set euid *before* doing chdir() so 1528 * a) the user won't be carried to a directory that he couldn't reach 1529 * on his own due to no permission to upper path components, 1530 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1531 * (uid 0 has no root power over NFS if not mapped explicitly.) 1532 */ 1533 if (seteuid(pw->pw_uid) < 0) { 1534 reply(550, "Can't set uid."); 1535 goto bad; 1536 } 1537 if (chdir(homedir) < 0) { 1538 if (guest || dochroot) { 1539 reply(550, "Can't change to base directory."); 1540 goto bad; 1541 } else { 1542 if (chdir("/") < 0) { 1543 reply(550, "Root is inaccessible."); 1544 goto bad; 1545 } 1546 lreply(230, "No directory! Logging in with home=/."); 1547 } 1548 } 1549 1550 /* 1551 * Display a login message, if it exists. 1552 * N.B. reply(230,) must follow the message. 1553 */ 1554 #ifdef VIRTUAL_HOSTING 1555 fd = fopen(thishost->loginmsg, "r"); 1556 #else 1557 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1558 #endif 1559 if (fd != NULL) { 1560 char *cp, line[LINE_MAX]; 1561 1562 while (fgets(line, sizeof(line), fd) != NULL) { 1563 if ((cp = strchr(line, '\n')) != NULL) 1564 *cp = '\0'; 1565 lreply(230, "%s", line); 1566 } 1567 fflush(stdout); 1568 fclose(fd); 1569 } 1570 if (guest) { 1571 if (ident != NULL) 1572 free(ident); 1573 ident = strdup(passwd); 1574 if (ident == NULL) 1575 fatalerror("Ran out of memory."); 1576 1577 reply(230, "Guest login ok, access restrictions apply."); 1578 #ifdef SETPROCTITLE 1579 #ifdef VIRTUAL_HOSTING 1580 if (thishost != firsthost) 1581 snprintf(proctitle, sizeof(proctitle), 1582 "%s: anonymous(%s)/%s", remotehost, hostname, 1583 passwd); 1584 else 1585 #endif 1586 snprintf(proctitle, sizeof(proctitle), 1587 "%s: anonymous/%s", remotehost, passwd); 1588 setproctitle("%s", proctitle); 1589 #endif /* SETPROCTITLE */ 1590 if (logging) 1591 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1592 remotehost, passwd); 1593 } else { 1594 if (dochroot) 1595 reply(230, "User %s logged in, " 1596 "access restrictions apply.", pw->pw_name); 1597 else 1598 reply(230, "User %s logged in.", pw->pw_name); 1599 1600 #ifdef SETPROCTITLE 1601 snprintf(proctitle, sizeof(proctitle), 1602 "%s: user/%s", remotehost, pw->pw_name); 1603 setproctitle("%s", proctitle); 1604 #endif /* SETPROCTITLE */ 1605 if (logging) 1606 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1607 remotehost, pw->pw_name); 1608 } 1609 if (logging && (guest || dochroot)) 1610 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1611 #ifdef LOGIN_CAP 1612 login_close(lc); 1613 #endif 1614 if (residue) 1615 free(residue); 1616 return; 1617 bad: 1618 /* Forget all about it... */ 1619 #ifdef LOGIN_CAP 1620 login_close(lc); 1621 #endif 1622 if (residue) 1623 free(residue); 1624 end_login(); 1625 } 1626 1627 void 1628 retrieve(char *cmd, char *name) 1629 { 1630 FILE *fin, *dout; 1631 struct stat st; 1632 int (*closefunc)(FILE *); 1633 time_t start; 1634 1635 if (cmd == NULL) { 1636 fin = fopen(name, "r"), closefunc = fclose; 1637 st.st_size = 0; 1638 } else { 1639 char line[BUFSIZ]; 1640 1641 snprintf(line, sizeof(line), cmd, name), name = line; 1642 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1643 st.st_size = -1; 1644 st.st_blksize = BUFSIZ; 1645 } 1646 if (fin == NULL) { 1647 if (errno != 0) { 1648 perror_reply(550, name); 1649 if (cmd == NULL) { 1650 LOGCMD("get", name); 1651 } 1652 } 1653 return; 1654 } 1655 byte_count = -1; 1656 if (cmd == NULL) { 1657 if (fstat(fileno(fin), &st) < 0) { 1658 perror_reply(550, name); 1659 goto done; 1660 } 1661 if (!S_ISREG(st.st_mode)) { 1662 /* 1663 * Never sending a raw directory is a workaround 1664 * for buggy clients that will attempt to RETR 1665 * a directory before listing it, e.g., Mozilla. 1666 * Preventing a guest from getting irregular files 1667 * is a simple security measure. 1668 */ 1669 if (S_ISDIR(st.st_mode) || guest) { 1670 reply(550, "%s: not a plain file.", name); 1671 goto done; 1672 } 1673 st.st_size = -1; 1674 /* st.st_blksize is set for all descriptor types */ 1675 } 1676 } 1677 if (restart_point) { 1678 if (type == TYPE_A) { 1679 off_t i, n; 1680 int c; 1681 1682 n = restart_point; 1683 i = 0; 1684 while (i++ < n) { 1685 if ((c=getc(fin)) == EOF) { 1686 perror_reply(550, name); 1687 goto done; 1688 } 1689 if (c == '\n') 1690 i++; 1691 } 1692 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1693 perror_reply(550, name); 1694 goto done; 1695 } 1696 } 1697 dout = dataconn(name, st.st_size, "w"); 1698 if (dout == NULL) 1699 goto done; 1700 time(&start); 1701 send_data(fin, dout, st.st_blksize, st.st_size, 1702 restart_point == 0 && cmd == NULL && S_ISREG(st.st_mode)); 1703 if (cmd == NULL && guest && stats && byte_count > 0) 1704 logxfer(name, byte_count, start); 1705 fclose(dout); 1706 data = -1; 1707 pdata = -1; 1708 done: 1709 if (cmd == NULL) 1710 LOGBYTES("get", name, byte_count); 1711 (*closefunc)(fin); 1712 } 1713 1714 void 1715 store(char *name, char *mode, int unique) 1716 { 1717 int fd; 1718 FILE *fout, *din; 1719 int (*closefunc)(FILE *); 1720 1721 if (*mode == 'a') { /* APPE */ 1722 if (unique) { 1723 /* Programming error */ 1724 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1725 unique = 0; 1726 } 1727 if (guest && noguestmod) { 1728 reply(550, "Appending to existing file denied."); 1729 goto err; 1730 } 1731 restart_point = 0; /* not affected by preceding REST */ 1732 } 1733 if (unique) /* STOU overrides REST */ 1734 restart_point = 0; 1735 if (guest && noguestmod) { 1736 if (restart_point) { /* guest STOR w/REST */ 1737 reply(550, "Modifying existing file denied."); 1738 goto err; 1739 } else /* treat guest STOR as STOU */ 1740 unique = 1; 1741 } 1742 1743 if (restart_point) 1744 mode = "r+"; /* so ASCII manual seek can work */ 1745 if (unique) { 1746 if ((fd = guniquefd(name, &name)) < 0) 1747 goto err; 1748 fout = fdopen(fd, mode); 1749 } else 1750 fout = fopen(name, mode); 1751 closefunc = fclose; 1752 if (fout == NULL) { 1753 perror_reply(553, name); 1754 goto err; 1755 } 1756 byte_count = -1; 1757 if (restart_point) { 1758 if (type == TYPE_A) { 1759 off_t i, n; 1760 int c; 1761 1762 n = restart_point; 1763 i = 0; 1764 while (i++ < n) { 1765 if ((c=getc(fout)) == EOF) { 1766 perror_reply(550, name); 1767 goto done; 1768 } 1769 if (c == '\n') 1770 i++; 1771 } 1772 /* 1773 * We must do this seek to "current" position 1774 * because we are changing from reading to 1775 * writing. 1776 */ 1777 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1778 perror_reply(550, name); 1779 goto done; 1780 } 1781 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1782 perror_reply(550, name); 1783 goto done; 1784 } 1785 } 1786 din = dataconn(name, -1, "r"); 1787 if (din == NULL) 1788 goto done; 1789 if (receive_data(din, fout) == 0) { 1790 if (unique) 1791 reply(226, "Transfer complete (unique file name:%s).", 1792 name); 1793 else 1794 reply(226, "Transfer complete."); 1795 } 1796 fclose(din); 1797 data = -1; 1798 pdata = -1; 1799 done: 1800 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1801 (*closefunc)(fout); 1802 return; 1803 err: 1804 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1805 return; 1806 } 1807 1808 static FILE * 1809 getdatasock(char *mode) 1810 { 1811 int on = 1, s, t, tries; 1812 1813 if (data >= 0) 1814 return (fdopen(data, mode)); 1815 1816 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1817 if (s < 0) 1818 goto bad; 1819 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1820 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1821 /* anchor socket to avoid multi-homing problems */ 1822 data_source = ctrl_addr; 1823 data_source.su_port = htons(dataport); 1824 seteuid(0); 1825 for (tries = 1; ; tries++) { 1826 /* 1827 * We should loop here since it's possible that 1828 * another ftpd instance has passed this point and is 1829 * trying to open a data connection in active mode now. 1830 * Until the other connection is opened, we'll be getting 1831 * EADDRINUSE because no SOCK_STREAM sockets in the system 1832 * can share both local and remote addresses, localIP:20 1833 * and *:* in this case. 1834 */ 1835 if (bind(s, (struct sockaddr *)&data_source, 1836 data_source.su_len) >= 0) 1837 break; 1838 if (errno != EADDRINUSE || tries > 10) 1839 goto bad; 1840 sleep(tries); 1841 } 1842 seteuid(pw->pw_uid); 1843 #ifdef IP_TOS 1844 if (data_source.su_family == AF_INET) 1845 { 1846 on = IPTOS_THROUGHPUT; 1847 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1848 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1849 } 1850 #endif 1851 #ifdef TCP_NOPUSH 1852 /* 1853 * Turn off push flag to keep sender TCP from sending short packets 1854 * at the boundaries of each write(). 1855 */ 1856 on = 1; 1857 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1858 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1859 #endif 1860 return (fdopen(s, mode)); 1861 bad: 1862 /* Return the real value of errno (close may change it) */ 1863 t = errno; 1864 seteuid(pw->pw_uid); 1865 close(s); 1866 errno = t; 1867 return (NULL); 1868 } 1869 1870 static FILE * 1871 dataconn(char *name, off_t size, char *mode) 1872 { 1873 char sizebuf[32]; 1874 FILE *file; 1875 int retry = 0, tos, conerrno; 1876 1877 file_size = size; 1878 byte_count = 0; 1879 if (size != -1) 1880 snprintf(sizebuf, sizeof(sizebuf), 1881 " (%jd bytes)", (intmax_t)size); 1882 else 1883 *sizebuf = '\0'; 1884 if (pdata >= 0) { 1885 union sockunion from; 1886 socklen_t fromlen = ctrl_addr.su_len; 1887 int flags, s; 1888 struct timeval timeout; 1889 fd_set set; 1890 1891 FD_ZERO(&set); 1892 FD_SET(pdata, &set); 1893 1894 timeout.tv_usec = 0; 1895 timeout.tv_sec = 120; 1896 1897 /* 1898 * Granted a socket is in the blocking I/O mode, 1899 * accept() will block after a successful select() 1900 * if the selected connection dies in between. 1901 * Therefore set the non-blocking I/O flag here. 1902 */ 1903 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1904 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1905 goto pdata_err; 1906 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1907 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1908 goto pdata_err; 1909 close(pdata); 1910 pdata = s; 1911 /* 1912 * Unset the inherited non-blocking I/O flag 1913 * on the child socket so stdio can work on it. 1914 */ 1915 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1916 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1917 goto pdata_err; 1918 #ifdef IP_TOS 1919 if (from.su_family == AF_INET) 1920 { 1921 tos = IPTOS_THROUGHPUT; 1922 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1923 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1924 } 1925 #endif 1926 reply(150, "Opening %s mode data connection for '%s'%s.", 1927 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1928 return (fdopen(pdata, mode)); 1929 pdata_err: 1930 reply(425, "Can't open data connection."); 1931 close(pdata); 1932 pdata = -1; 1933 return (NULL); 1934 } 1935 if (data >= 0) { 1936 reply(125, "Using existing data connection for '%s'%s.", 1937 name, sizebuf); 1938 usedefault = 1; 1939 return (fdopen(data, mode)); 1940 } 1941 if (usedefault) 1942 data_dest = his_addr; 1943 usedefault = 1; 1944 do { 1945 file = getdatasock(mode); 1946 if (file == NULL) { 1947 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1948 1949 if (getnameinfo((struct sockaddr *)&data_source, 1950 data_source.su_len, 1951 hostbuf, sizeof(hostbuf) - 1, 1952 portbuf, sizeof(portbuf) - 1, 1953 NI_NUMERICHOST|NI_NUMERICSERV)) 1954 *hostbuf = *portbuf = 0; 1955 hostbuf[sizeof(hostbuf) - 1] = 0; 1956 portbuf[sizeof(portbuf) - 1] = 0; 1957 reply(425, "Can't create data socket (%s,%s): %s.", 1958 hostbuf, portbuf, strerror(errno)); 1959 return (NULL); 1960 } 1961 data = fileno(file); 1962 conerrno = 0; 1963 if (connect(data, (struct sockaddr *)&data_dest, 1964 data_dest.su_len) == 0) 1965 break; 1966 conerrno = errno; 1967 fclose(file); 1968 data = -1; 1969 if (conerrno == EADDRINUSE) { 1970 sleep(swaitint); 1971 retry += swaitint; 1972 } else { 1973 break; 1974 } 1975 } while (retry <= swaitmax); 1976 if (conerrno != 0) { 1977 reply(425, "Can't build data connection: %s.", 1978 strerror(conerrno)); 1979 return (NULL); 1980 } 1981 reply(150, "Opening %s mode data connection for '%s'%s.", 1982 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1983 return (file); 1984 } 1985 1986 /* 1987 * A helper macro to avoid code duplication 1988 * in send_data() and receive_data(). 1989 * 1990 * XXX We have to block SIGURG during putc() because BSD stdio 1991 * is unable to restart interrupted write operations and hence 1992 * the entire buffer contents will be lost as soon as a write() 1993 * call indicates EINTR to stdio. 1994 */ 1995 #define FTPD_PUTC(ch, file, label) \ 1996 do { \ 1997 int ret; \ 1998 \ 1999 do { \ 2000 START_UNSAFE; \ 2001 ret = putc((ch), (file)); \ 2002 END_UNSAFE; \ 2003 CHECKOOB(return (-1)) \ 2004 else if (ferror(file)) \ 2005 goto label; \ 2006 clearerr(file); \ 2007 } while (ret == EOF); \ 2008 } while (0) 2009 2010 /* 2011 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2012 * encapsulation of the data subject to Mode, Structure, and Type. 2013 * 2014 * NB: Form isn't handled. 2015 */ 2016 static int 2017 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2018 { 2019 int c, cp, filefd, netfd; 2020 char *buf; 2021 2022 STARTXFER; 2023 2024 switch (type) { 2025 2026 case TYPE_A: 2027 cp = EOF; 2028 for (;;) { 2029 c = getc(instr); 2030 CHECKOOB(return (-1)) 2031 else if (c == EOF && ferror(instr)) 2032 goto file_err; 2033 if (c == EOF) { 2034 if (ferror(instr)) { /* resume after OOB */ 2035 clearerr(instr); 2036 continue; 2037 } 2038 if (feof(instr)) /* EOF */ 2039 break; 2040 syslog(LOG_ERR, "Internal: impossible condition" 2041 " on file after getc()"); 2042 goto file_err; 2043 } 2044 if (c == '\n' && cp != '\r') { 2045 FTPD_PUTC('\r', outstr, data_err); 2046 byte_count++; 2047 } 2048 FTPD_PUTC(c, outstr, data_err); 2049 byte_count++; 2050 cp = c; 2051 } 2052 #ifdef notyet /* BSD stdio isn't ready for that */ 2053 while (fflush(outstr) == EOF) { 2054 CHECKOOB(return (-1)) 2055 else 2056 goto data_err; 2057 clearerr(outstr); 2058 } 2059 ENDXFER; 2060 #else 2061 ENDXFER; 2062 if (fflush(outstr) == EOF) 2063 goto data_err; 2064 #endif 2065 reply(226, "Transfer complete."); 2066 return (0); 2067 2068 case TYPE_I: 2069 case TYPE_L: 2070 /* 2071 * isreg is only set if we are not doing restart and we 2072 * are sending a regular file 2073 */ 2074 netfd = fileno(outstr); 2075 filefd = fileno(instr); 2076 2077 if (isreg) { 2078 char *msg = "Transfer complete."; 2079 off_t cnt, offset; 2080 int err; 2081 2082 cnt = offset = 0; 2083 2084 while (filesize > 0) { 2085 err = sendfile(filefd, netfd, offset, 0, 2086 NULL, &cnt, 0); 2087 /* 2088 * Calculate byte_count before OOB processing. 2089 * It can be used in myoob() later. 2090 */ 2091 byte_count += cnt; 2092 offset += cnt; 2093 filesize -= cnt; 2094 CHECKOOB(return (-1)) 2095 else if (err == -1) { 2096 if (errno != EINTR && 2097 cnt == 0 && offset == 0) 2098 goto oldway; 2099 goto data_err; 2100 } 2101 if (err == -1) /* resume after OOB */ 2102 continue; 2103 /* 2104 * We hit the EOF prematurely. 2105 * Perhaps the file was externally truncated. 2106 */ 2107 if (cnt == 0) { 2108 msg = "Transfer finished due to " 2109 "premature end of file."; 2110 break; 2111 } 2112 } 2113 ENDXFER; 2114 reply(226, "%s", msg); 2115 return (0); 2116 } 2117 2118 oldway: 2119 if ((buf = malloc(blksize)) == NULL) { 2120 ENDXFER; 2121 reply(451, "Ran out of memory."); 2122 return (-1); 2123 } 2124 2125 for (;;) { 2126 int cnt, len; 2127 char *bp; 2128 2129 cnt = read(filefd, buf, blksize); 2130 CHECKOOB(free(buf); return (-1)) 2131 else if (cnt < 0) { 2132 free(buf); 2133 goto file_err; 2134 } 2135 if (cnt < 0) /* resume after OOB */ 2136 continue; 2137 if (cnt == 0) /* EOF */ 2138 break; 2139 for (len = cnt, bp = buf; len > 0;) { 2140 cnt = write(netfd, bp, len); 2141 CHECKOOB(free(buf); return (-1)) 2142 else if (cnt < 0) { 2143 free(buf); 2144 goto data_err; 2145 } 2146 if (cnt <= 0) 2147 continue; 2148 len -= cnt; 2149 bp += cnt; 2150 byte_count += cnt; 2151 } 2152 } 2153 ENDXFER; 2154 free(buf); 2155 reply(226, "Transfer complete."); 2156 return (0); 2157 default: 2158 ENDXFER; 2159 reply(550, "Unimplemented TYPE %d in send_data.", type); 2160 return (-1); 2161 } 2162 2163 data_err: 2164 ENDXFER; 2165 perror_reply(426, "Data connection"); 2166 return (-1); 2167 2168 file_err: 2169 ENDXFER; 2170 perror_reply(551, "Error on input file"); 2171 return (-1); 2172 } 2173 2174 /* 2175 * Transfer data from peer to "outstr" using the appropriate encapulation of 2176 * the data subject to Mode, Structure, and Type. 2177 * 2178 * N.B.: Form isn't handled. 2179 */ 2180 static int 2181 receive_data(FILE *instr, FILE *outstr) 2182 { 2183 int c, cp; 2184 int bare_lfs = 0; 2185 2186 STARTXFER; 2187 2188 switch (type) { 2189 2190 case TYPE_I: 2191 case TYPE_L: 2192 for (;;) { 2193 int cnt, len; 2194 char *bp; 2195 char buf[BUFSIZ]; 2196 2197 cnt = read(fileno(instr), buf, sizeof(buf)); 2198 CHECKOOB(return (-1)) 2199 else if (cnt < 0) 2200 goto data_err; 2201 if (cnt < 0) /* resume after OOB */ 2202 continue; 2203 if (cnt == 0) /* EOF */ 2204 break; 2205 for (len = cnt, bp = buf; len > 0;) { 2206 cnt = write(fileno(outstr), bp, len); 2207 CHECKOOB(return (-1)) 2208 else if (cnt < 0) 2209 goto file_err; 2210 if (cnt <= 0) 2211 continue; 2212 len -= cnt; 2213 bp += cnt; 2214 byte_count += cnt; 2215 } 2216 } 2217 ENDXFER; 2218 return (0); 2219 2220 case TYPE_E: 2221 ENDXFER; 2222 reply(553, "TYPE E not implemented."); 2223 return (-1); 2224 2225 case TYPE_A: 2226 cp = EOF; 2227 for (;;) { 2228 c = getc(instr); 2229 CHECKOOB(return (-1)) 2230 else if (c == EOF && ferror(instr)) 2231 goto data_err; 2232 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2233 clearerr(instr); 2234 continue; 2235 } 2236 2237 if (cp == '\r') { 2238 if (c != '\n') 2239 FTPD_PUTC('\r', outstr, file_err); 2240 } else 2241 if (c == '\n') 2242 bare_lfs++; 2243 if (c == '\r') { 2244 byte_count++; 2245 cp = c; 2246 continue; 2247 } 2248 2249 /* Check for EOF here in order not to lose last \r. */ 2250 if (c == EOF) { 2251 if (feof(instr)) /* EOF */ 2252 break; 2253 syslog(LOG_ERR, "Internal: impossible condition" 2254 " on data stream after getc()"); 2255 goto data_err; 2256 } 2257 2258 byte_count++; 2259 FTPD_PUTC(c, outstr, file_err); 2260 cp = c; 2261 } 2262 #ifdef notyet /* BSD stdio isn't ready for that */ 2263 while (fflush(outstr) == EOF) { 2264 CHECKOOB(return (-1)) 2265 else 2266 goto file_err; 2267 clearerr(outstr); 2268 } 2269 ENDXFER; 2270 #else 2271 ENDXFER; 2272 if (fflush(outstr) == EOF) 2273 goto file_err; 2274 #endif 2275 if (bare_lfs) { 2276 lreply(226, 2277 "WARNING! %d bare linefeeds received in ASCII mode.", 2278 bare_lfs); 2279 printf(" File may not have transferred correctly.\r\n"); 2280 } 2281 return (0); 2282 default: 2283 ENDXFER; 2284 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2285 return (-1); 2286 } 2287 2288 data_err: 2289 ENDXFER; 2290 perror_reply(426, "Data connection"); 2291 return (-1); 2292 2293 file_err: 2294 ENDXFER; 2295 perror_reply(452, "Error writing to file"); 2296 return (-1); 2297 } 2298 2299 void 2300 statfilecmd(char *filename) 2301 { 2302 FILE *fin; 2303 int atstart; 2304 int c, code; 2305 char line[LINE_MAX]; 2306 struct stat st; 2307 2308 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2309 snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2310 fin = ftpd_popen(line, "r"); 2311 lreply(code, "Status of %s:", filename); 2312 atstart = 1; 2313 while ((c = getc(fin)) != EOF) { 2314 if (c == '\n') { 2315 if (ferror(stdout)){ 2316 perror_reply(421, "Control connection"); 2317 ftpd_pclose(fin); 2318 dologout(1); 2319 /* NOTREACHED */ 2320 } 2321 if (ferror(fin)) { 2322 perror_reply(551, filename); 2323 ftpd_pclose(fin); 2324 return; 2325 } 2326 putc('\r', stdout); 2327 } 2328 /* 2329 * RFC 959 says neutral text should be prepended before 2330 * a leading 3-digit number followed by whitespace, but 2331 * many ftp clients can be confused by any leading digits, 2332 * as a matter of fact. 2333 */ 2334 if (atstart && isdigit(c)) 2335 putc(' ', stdout); 2336 putc(c, stdout); 2337 atstart = (c == '\n'); 2338 } 2339 ftpd_pclose(fin); 2340 reply(code, "End of status."); 2341 } 2342 2343 void 2344 statcmd(void) 2345 { 2346 union sockunion *su; 2347 u_char *a, *p; 2348 char hname[NI_MAXHOST]; 2349 int ispassive; 2350 2351 if (hostinfo) { 2352 lreply(211, "%s FTP server status:", hostname); 2353 printf(" %s\r\n", version); 2354 } else 2355 lreply(211, "FTP server status:"); 2356 printf(" Connected to %s", remotehost); 2357 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2358 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2359 hname[sizeof(hname) - 1] = 0; 2360 if (strcmp(hname, remotehost) != 0) 2361 printf(" (%s)", hname); 2362 } 2363 printf("\r\n"); 2364 if (logged_in) { 2365 if (guest) 2366 printf(" Logged in anonymously\r\n"); 2367 else 2368 printf(" Logged in as %s\r\n", pw->pw_name); 2369 } else if (askpasswd) 2370 printf(" Waiting for password\r\n"); 2371 else 2372 printf(" Waiting for user name\r\n"); 2373 printf(" TYPE: %s", typenames[type]); 2374 if (type == TYPE_A || type == TYPE_E) 2375 printf(", FORM: %s", formnames[form]); 2376 if (type == TYPE_L) 2377 #if CHAR_BIT == 8 2378 printf(" %d", CHAR_BIT); 2379 #else 2380 printf(" %d", bytesize); /* need definition! */ 2381 #endif 2382 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2383 strunames[stru], modenames[mode]); 2384 if (data != -1) 2385 printf(" Data connection open\r\n"); 2386 else if (pdata != -1) { 2387 ispassive = 1; 2388 su = &pasv_addr; 2389 goto printaddr; 2390 } else if (usedefault == 0) { 2391 ispassive = 0; 2392 su = &data_dest; 2393 printaddr: 2394 #define UC(b) (((int) b) & 0xff) 2395 if (epsvall) { 2396 printf(" EPSV only mode (EPSV ALL)\r\n"); 2397 goto epsvonly; 2398 } 2399 2400 /* PORT/PASV */ 2401 if (su->su_family == AF_INET) { 2402 a = (u_char *) &su->su_sin.sin_addr; 2403 p = (u_char *) &su->su_sin.sin_port; 2404 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2405 ispassive ? "PASV" : "PORT", 2406 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2407 UC(p[0]), UC(p[1])); 2408 } 2409 2410 /* LPRT/LPSV */ 2411 { 2412 int alen, af, i; 2413 2414 switch (su->su_family) { 2415 case AF_INET: 2416 a = (u_char *) &su->su_sin.sin_addr; 2417 p = (u_char *) &su->su_sin.sin_port; 2418 alen = sizeof(su->su_sin.sin_addr); 2419 af = 4; 2420 break; 2421 case AF_INET6: 2422 a = (u_char *) &su->su_sin6.sin6_addr; 2423 p = (u_char *) &su->su_sin6.sin6_port; 2424 alen = sizeof(su->su_sin6.sin6_addr); 2425 af = 6; 2426 break; 2427 default: 2428 af = 0; 2429 break; 2430 } 2431 if (af) { 2432 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2433 af, alen); 2434 for (i = 0; i < alen; i++) 2435 printf("%d,", UC(a[i])); 2436 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2437 } 2438 } 2439 2440 epsvonly:; 2441 /* EPRT/EPSV */ 2442 { 2443 int af; 2444 2445 switch (su->su_family) { 2446 case AF_INET: 2447 af = 1; 2448 break; 2449 case AF_INET6: 2450 af = 2; 2451 break; 2452 default: 2453 af = 0; 2454 break; 2455 } 2456 if (af) { 2457 union sockunion tmp; 2458 2459 tmp = *su; 2460 if (tmp.su_family == AF_INET6) 2461 tmp.su_sin6.sin6_scope_id = 0; 2462 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2463 hname, sizeof(hname) - 1, NULL, 0, 2464 NI_NUMERICHOST)) { 2465 hname[sizeof(hname) - 1] = 0; 2466 printf(" %s |%d|%s|%d|\r\n", 2467 ispassive ? "EPSV" : "EPRT", 2468 af, hname, htons(tmp.su_port)); 2469 } 2470 } 2471 } 2472 #undef UC 2473 } else 2474 printf(" No data connection\r\n"); 2475 reply(211, "End of status."); 2476 } 2477 2478 void 2479 fatalerror(char *s) 2480 { 2481 2482 reply(451, "Error in server: %s", s); 2483 reply(221, "Closing connection due to server error."); 2484 dologout(0); 2485 /* NOTREACHED */ 2486 } 2487 2488 void 2489 reply(int n, const char *fmt, ...) 2490 { 2491 va_list ap; 2492 2493 printf("%d ", n); 2494 va_start(ap, fmt); 2495 vprintf(fmt, ap); 2496 va_end(ap); 2497 printf("\r\n"); 2498 fflush(stdout); 2499 if (ftpdebug) { 2500 syslog(LOG_DEBUG, "<--- %d ", n); 2501 va_start(ap, fmt); 2502 vsyslog(LOG_DEBUG, fmt, ap); 2503 va_end(ap); 2504 } 2505 } 2506 2507 void 2508 lreply(int n, const char *fmt, ...) 2509 { 2510 va_list ap; 2511 2512 printf("%d- ", n); 2513 va_start(ap, fmt); 2514 vprintf(fmt, ap); 2515 va_end(ap); 2516 printf("\r\n"); 2517 fflush(stdout); 2518 if (ftpdebug) { 2519 syslog(LOG_DEBUG, "<--- %d- ", n); 2520 va_start(ap, fmt); 2521 vsyslog(LOG_DEBUG, fmt, ap); 2522 va_end(ap); 2523 } 2524 } 2525 2526 static void 2527 ack(char *s) 2528 { 2529 2530 reply(250, "%s command successful.", s); 2531 } 2532 2533 void 2534 nack(char *s) 2535 { 2536 2537 reply(502, "%s command not implemented.", s); 2538 } 2539 2540 /* ARGSUSED */ 2541 void 2542 yyerror(char *s) 2543 { 2544 char *cp; 2545 2546 if ((cp = strchr(cbuf,'\n'))) 2547 *cp = '\0'; 2548 reply(500, "%s: command not understood.", cbuf); 2549 } 2550 2551 void 2552 delete(char *name) 2553 { 2554 struct stat st; 2555 2556 LOGCMD("delete", name); 2557 if (lstat(name, &st) < 0) { 2558 perror_reply(550, name); 2559 return; 2560 } 2561 if (S_ISDIR(st.st_mode)) { 2562 if (rmdir(name) < 0) { 2563 perror_reply(550, name); 2564 return; 2565 } 2566 goto done; 2567 } 2568 if (guest && noguestmod) { 2569 reply(550, "Operation not permitted."); 2570 return; 2571 } 2572 if (unlink(name) < 0) { 2573 perror_reply(550, name); 2574 return; 2575 } 2576 done: 2577 ack("DELE"); 2578 } 2579 2580 void 2581 cwd(char *path) 2582 { 2583 2584 if (chdir(path) < 0) 2585 perror_reply(550, path); 2586 else 2587 ack("CWD"); 2588 } 2589 2590 void 2591 makedir(char *name) 2592 { 2593 char *s; 2594 2595 LOGCMD("mkdir", name); 2596 if (guest && noguestmkd) 2597 reply(550, "Operation not permitted."); 2598 else if (mkdir(name, 0777) < 0) 2599 perror_reply(550, name); 2600 else { 2601 if ((s = doublequote(name)) == NULL) 2602 fatalerror("Ran out of memory."); 2603 reply(257, "\"%s\" directory created.", s); 2604 free(s); 2605 } 2606 } 2607 2608 void 2609 removedir(char *name) 2610 { 2611 2612 LOGCMD("rmdir", name); 2613 if (rmdir(name) < 0) 2614 perror_reply(550, name); 2615 else 2616 ack("RMD"); 2617 } 2618 2619 void 2620 pwd(void) 2621 { 2622 char *s, path[MAXPATHLEN + 1]; 2623 2624 if (getcwd(path, sizeof(path)) == NULL) 2625 perror_reply(550, "Get current directory"); 2626 else { 2627 if ((s = doublequote(path)) == NULL) 2628 fatalerror("Ran out of memory."); 2629 reply(257, "\"%s\" is current directory.", s); 2630 free(s); 2631 } 2632 } 2633 2634 char * 2635 renamefrom(char *name) 2636 { 2637 struct stat st; 2638 2639 if (guest && noguestmod) { 2640 reply(550, "Operation not permitted."); 2641 return (NULL); 2642 } 2643 if (lstat(name, &st) < 0) { 2644 perror_reply(550, name); 2645 return (NULL); 2646 } 2647 reply(350, "File exists, ready for destination name."); 2648 return (name); 2649 } 2650 2651 void 2652 renamecmd(char *from, char *to) 2653 { 2654 struct stat st; 2655 2656 LOGCMD2("rename", from, to); 2657 2658 if (guest && (stat(to, &st) == 0)) { 2659 reply(550, "%s: permission denied.", to); 2660 return; 2661 } 2662 2663 if (rename(from, to) < 0) 2664 perror_reply(550, "rename"); 2665 else 2666 ack("RNTO"); 2667 } 2668 2669 static void 2670 dolog(struct sockaddr *who) 2671 { 2672 char who_name[NI_MAXHOST]; 2673 2674 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2675 remotehost[sizeof(remotehost) - 1] = 0; 2676 if (getnameinfo(who, who->sa_len, 2677 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2678 *who_name = 0; 2679 who_name[sizeof(who_name) - 1] = 0; 2680 2681 #ifdef SETPROCTITLE 2682 #ifdef VIRTUAL_HOSTING 2683 if (thishost != firsthost) 2684 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2685 remotehost, hostname); 2686 else 2687 #endif 2688 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2689 remotehost); 2690 setproctitle("%s", proctitle); 2691 #endif /* SETPROCTITLE */ 2692 2693 if (logging) { 2694 #ifdef VIRTUAL_HOSTING 2695 if (thishost != firsthost) 2696 syslog(LOG_INFO, "connection from %s (%s) to %s", 2697 remotehost, who_name, hostname); 2698 else 2699 #endif 2700 syslog(LOG_INFO, "connection from %s (%s)", 2701 remotehost, who_name); 2702 } 2703 } 2704 2705 /* 2706 * Record logout in wtmp file 2707 * and exit with supplied status. 2708 */ 2709 void 2710 dologout(int status) 2711 { 2712 2713 if (logged_in && dowtmp) { 2714 seteuid(0); 2715 ftpd_logwtmp(ttyline, "", NULL); 2716 } 2717 /* beware of flushing buffers after a SIGPIPE */ 2718 _exit(status); 2719 } 2720 2721 static void 2722 sigurg(int signo) 2723 { 2724 2725 recvurg = 1; 2726 } 2727 2728 static void 2729 maskurg(int flag) 2730 { 2731 int oerrno; 2732 sigset_t sset; 2733 2734 if (!transflag) { 2735 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2736 return; 2737 } 2738 oerrno = errno; 2739 sigemptyset(&sset); 2740 sigaddset(&sset, SIGURG); 2741 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2742 errno = oerrno; 2743 } 2744 2745 static void 2746 flagxfer(int flag) 2747 { 2748 2749 if (flag) { 2750 if (transflag) 2751 syslog(LOG_ERR, "Internal: flagxfer(1): " 2752 "transfer already under way"); 2753 transflag = 1; 2754 maskurg(0); 2755 recvurg = 0; 2756 } else { 2757 if (!transflag) 2758 syslog(LOG_ERR, "Internal: flagxfer(0): " 2759 "no active transfer"); 2760 maskurg(1); 2761 transflag = 0; 2762 } 2763 } 2764 2765 /* 2766 * Returns 0 if OK to resume or -1 if abort requested. 2767 */ 2768 static int 2769 myoob(void) 2770 { 2771 char *cp; 2772 int ret; 2773 2774 if (!transflag) { 2775 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2776 return (0); 2777 } 2778 cp = tmpline; 2779 ret = get_line(cp, 7, stdin); 2780 if (ret == -1) { 2781 reply(221, "You could at least say goodbye."); 2782 dologout(0); 2783 } else if (ret == -2) { 2784 /* Ignore truncated command. */ 2785 return (0); 2786 } 2787 upper(cp); 2788 if (strcmp(cp, "ABOR\r\n") == 0) { 2789 tmpline[0] = '\0'; 2790 reply(426, "Transfer aborted. Data connection closed."); 2791 reply(226, "Abort successful."); 2792 return (-1); 2793 } 2794 if (strcmp(cp, "STAT\r\n") == 0) { 2795 tmpline[0] = '\0'; 2796 if (file_size != -1) 2797 reply(213, "Status: %jd of %jd bytes transferred.", 2798 (intmax_t)byte_count, (intmax_t)file_size); 2799 else 2800 reply(213, "Status: %jd bytes transferred.", 2801 (intmax_t)byte_count); 2802 } 2803 return (0); 2804 } 2805 2806 /* 2807 * Note: a response of 425 is not mentioned as a possible response to 2808 * the PASV command in RFC959. However, it has been blessed as 2809 * a legitimate response by Jon Postel in a telephone conversation 2810 * with Rick Adams on 25 Jan 89. 2811 */ 2812 void 2813 passive(void) 2814 { 2815 socklen_t len; 2816 int on; 2817 char *p, *a; 2818 2819 if (pdata >= 0) /* close old port if one set */ 2820 close(pdata); 2821 2822 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2823 if (pdata < 0) { 2824 perror_reply(425, "Can't open passive connection"); 2825 return; 2826 } 2827 on = 1; 2828 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2829 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2830 2831 seteuid(0); 2832 2833 #ifdef IP_PORTRANGE 2834 if (ctrl_addr.su_family == AF_INET) { 2835 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2836 : IP_PORTRANGE_DEFAULT; 2837 2838 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2839 &on, sizeof(on)) < 0) 2840 goto pasv_error; 2841 } 2842 #endif 2843 #ifdef IPV6_PORTRANGE 2844 if (ctrl_addr.su_family == AF_INET6) { 2845 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2846 : IPV6_PORTRANGE_DEFAULT; 2847 2848 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2849 &on, sizeof(on)) < 0) 2850 goto pasv_error; 2851 } 2852 #endif 2853 2854 pasv_addr = ctrl_addr; 2855 pasv_addr.su_port = 0; 2856 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2857 goto pasv_error; 2858 2859 seteuid(pw->pw_uid); 2860 2861 len = sizeof(pasv_addr); 2862 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2863 goto pasv_error; 2864 if (listen(pdata, 1) < 0) 2865 goto pasv_error; 2866 if (pasv_addr.su_family == AF_INET) 2867 a = (char *) &pasv_addr.su_sin.sin_addr; 2868 else if (pasv_addr.su_family == AF_INET6 && 2869 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2870 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2871 else 2872 goto pasv_error; 2873 2874 p = (char *) &pasv_addr.su_port; 2875 2876 #define UC(b) (((int) b) & 0xff) 2877 2878 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2879 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2880 return; 2881 2882 pasv_error: 2883 seteuid(pw->pw_uid); 2884 close(pdata); 2885 pdata = -1; 2886 perror_reply(425, "Can't open passive connection"); 2887 return; 2888 } 2889 2890 /* 2891 * Long Passive defined in RFC 1639. 2892 * 228 Entering Long Passive Mode 2893 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2894 */ 2895 2896 void 2897 long_passive(char *cmd, int pf) 2898 { 2899 socklen_t len; 2900 int on; 2901 char *p, *a; 2902 2903 if (pdata >= 0) /* close old port if one set */ 2904 close(pdata); 2905 2906 if (pf != PF_UNSPEC) { 2907 if (ctrl_addr.su_family != pf) { 2908 switch (ctrl_addr.su_family) { 2909 case AF_INET: 2910 pf = 1; 2911 break; 2912 case AF_INET6: 2913 pf = 2; 2914 break; 2915 default: 2916 pf = 0; 2917 break; 2918 } 2919 /* 2920 * XXX 2921 * only EPRT/EPSV ready clients will understand this 2922 */ 2923 if (strcmp(cmd, "EPSV") == 0 && pf) { 2924 reply(522, "Network protocol mismatch, " 2925 "use (%d)", pf); 2926 } else 2927 reply(501, "Network protocol mismatch."); /*XXX*/ 2928 2929 return; 2930 } 2931 } 2932 2933 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2934 if (pdata < 0) { 2935 perror_reply(425, "Can't open passive connection"); 2936 return; 2937 } 2938 on = 1; 2939 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2940 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2941 2942 seteuid(0); 2943 2944 pasv_addr = ctrl_addr; 2945 pasv_addr.su_port = 0; 2946 len = pasv_addr.su_len; 2947 2948 #ifdef IP_PORTRANGE 2949 if (ctrl_addr.su_family == AF_INET) { 2950 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2951 : IP_PORTRANGE_DEFAULT; 2952 2953 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2954 &on, sizeof(on)) < 0) 2955 goto pasv_error; 2956 } 2957 #endif 2958 #ifdef IPV6_PORTRANGE 2959 if (ctrl_addr.su_family == AF_INET6) { 2960 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2961 : IPV6_PORTRANGE_DEFAULT; 2962 2963 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2964 &on, sizeof(on)) < 0) 2965 goto pasv_error; 2966 } 2967 #endif 2968 2969 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2970 goto pasv_error; 2971 2972 seteuid(pw->pw_uid); 2973 2974 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2975 goto pasv_error; 2976 if (listen(pdata, 1) < 0) 2977 goto pasv_error; 2978 2979 #define UC(b) (((int) b) & 0xff) 2980 2981 if (strcmp(cmd, "LPSV") == 0) { 2982 p = (char *)&pasv_addr.su_port; 2983 switch (pasv_addr.su_family) { 2984 case AF_INET: 2985 a = (char *) &pasv_addr.su_sin.sin_addr; 2986 v4_reply: 2987 reply(228, 2988 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2989 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2990 2, UC(p[0]), UC(p[1])); 2991 return; 2992 case AF_INET6: 2993 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2994 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2995 goto v4_reply; 2996 } 2997 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2998 reply(228, 2999 "Entering Long Passive Mode " 3000 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3001 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3002 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3003 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3004 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3005 2, UC(p[0]), UC(p[1])); 3006 return; 3007 } 3008 } else if (strcmp(cmd, "EPSV") == 0) { 3009 switch (pasv_addr.su_family) { 3010 case AF_INET: 3011 case AF_INET6: 3012 reply(229, "Entering Extended Passive Mode (|||%d|)", 3013 ntohs(pasv_addr.su_port)); 3014 return; 3015 } 3016 } else { 3017 /* more proper error code? */ 3018 } 3019 3020 pasv_error: 3021 seteuid(pw->pw_uid); 3022 close(pdata); 3023 pdata = -1; 3024 perror_reply(425, "Can't open passive connection"); 3025 return; 3026 } 3027 3028 /* 3029 * Generate unique name for file with basename "local" 3030 * and open the file in order to avoid possible races. 3031 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3032 * Return descriptor to the file, set "name" to its name. 3033 * 3034 * Generates failure reply on error. 3035 */ 3036 static int 3037 guniquefd(char *local, char **name) 3038 { 3039 static char new[MAXPATHLEN]; 3040 struct stat st; 3041 char *cp; 3042 int count; 3043 int fd; 3044 3045 cp = strrchr(local, '/'); 3046 if (cp) 3047 *cp = '\0'; 3048 if (stat(cp ? local : ".", &st) < 0) { 3049 perror_reply(553, cp ? local : "."); 3050 return (-1); 3051 } 3052 if (cp) { 3053 /* 3054 * Let not overwrite dirname with counter suffix. 3055 * -4 is for /nn\0 3056 * In this extreme case dot won't be put in front of suffix. 3057 */ 3058 if (strlen(local) > sizeof(new) - 4) { 3059 reply(553, "Pathname too long."); 3060 return (-1); 3061 } 3062 *cp = '/'; 3063 } 3064 /* -4 is for the .nn<null> we put on the end below */ 3065 snprintf(new, sizeof(new) - 4, "%s", local); 3066 cp = new + strlen(new); 3067 /* 3068 * Don't generate dotfile unless requested explicitly. 3069 * This covers the case when basename gets truncated off 3070 * by buffer size. 3071 */ 3072 if (cp > new && cp[-1] != '/') 3073 *cp++ = '.'; 3074 for (count = 0; count < 100; count++) { 3075 /* At count 0 try unmodified name */ 3076 if (count) 3077 sprintf(cp, "%d", count); 3078 if ((fd = open(count ? new : local, 3079 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3080 *name = count ? new : local; 3081 return (fd); 3082 } 3083 if (errno != EEXIST) { 3084 perror_reply(553, count ? new : local); 3085 return (-1); 3086 } 3087 } 3088 reply(452, "Unique file name cannot be created."); 3089 return (-1); 3090 } 3091 3092 /* 3093 * Format and send reply containing system error number. 3094 */ 3095 void 3096 perror_reply(int code, char *string) 3097 { 3098 3099 reply(code, "%s: %s.", string, strerror(errno)); 3100 } 3101 3102 static char *onefile[] = { 3103 "", 3104 0 3105 }; 3106 3107 void 3108 send_file_list(char *whichf) 3109 { 3110 struct stat st; 3111 DIR *dirp = NULL; 3112 struct dirent *dir; 3113 FILE *dout = NULL; 3114 char **dirlist, *dirname; 3115 int simple = 0; 3116 int freeglob = 0; 3117 glob_t gl; 3118 3119 if (strpbrk(whichf, "~{[*?") != NULL) { 3120 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3121 3122 memset(&gl, 0, sizeof(gl)); 3123 gl.gl_matchc = MAXGLOBARGS; 3124 /*flags |= GLOB_LIMIT;*/ 3125 freeglob = 1; 3126 if (glob(whichf, flags, 0, &gl)) { 3127 reply(550, "No matching files found."); 3128 goto out; 3129 } else if (gl.gl_pathc == 0) { 3130 errno = ENOENT; 3131 perror_reply(550, whichf); 3132 goto out; 3133 } 3134 dirlist = gl.gl_pathv; 3135 } else { 3136 onefile[0] = whichf; 3137 dirlist = onefile; 3138 simple = 1; 3139 } 3140 3141 while ((dirname = *dirlist++)) { 3142 if (stat(dirname, &st) < 0) { 3143 /* 3144 * If user typed "ls -l", etc, and the client 3145 * used NLST, do what the user meant. 3146 */ 3147 if (dirname[0] == '-' && *dirlist == NULL && 3148 dout == NULL) 3149 retrieve(_PATH_LS " %s", dirname); 3150 else 3151 perror_reply(550, whichf); 3152 goto out; 3153 } 3154 3155 if (S_ISREG(st.st_mode)) { 3156 if (dout == NULL) { 3157 dout = dataconn("file list", -1, "w"); 3158 if (dout == NULL) 3159 goto out; 3160 STARTXFER; 3161 } 3162 START_UNSAFE; 3163 fprintf(dout, "%s%s\n", dirname, 3164 type == TYPE_A ? "\r" : ""); 3165 END_UNSAFE; 3166 if (ferror(dout)) 3167 goto data_err; 3168 byte_count += strlen(dirname) + 3169 (type == TYPE_A ? 2 : 1); 3170 CHECKOOB(goto abrt); 3171 continue; 3172 } else if (!S_ISDIR(st.st_mode)) 3173 continue; 3174 3175 if ((dirp = opendir(dirname)) == NULL) 3176 continue; 3177 3178 while ((dir = readdir(dirp)) != NULL) { 3179 char nbuf[MAXPATHLEN]; 3180 3181 CHECKOOB(goto abrt); 3182 3183 if (strcmp(dir->d_name, ".") == 0) 3184 continue; 3185 if (strcmp(dir->d_name, "..") == 0) 3186 continue; 3187 3188 snprintf(nbuf, sizeof(nbuf), 3189 "%s/%s", dirname, dir->d_name); 3190 3191 /* 3192 * We have to do a stat to insure it's 3193 * not a directory or special file. 3194 */ 3195 if (simple || (stat(nbuf, &st) == 0 && 3196 S_ISREG(st.st_mode))) { 3197 if (dout == NULL) { 3198 dout = dataconn("file list", -1, "w"); 3199 if (dout == NULL) 3200 goto out; 3201 STARTXFER; 3202 } 3203 START_UNSAFE; 3204 if (nbuf[0] == '.' && nbuf[1] == '/') 3205 fprintf(dout, "%s%s\n", &nbuf[2], 3206 type == TYPE_A ? "\r" : ""); 3207 else 3208 fprintf(dout, "%s%s\n", nbuf, 3209 type == TYPE_A ? "\r" : ""); 3210 END_UNSAFE; 3211 if (ferror(dout)) 3212 goto data_err; 3213 byte_count += strlen(nbuf) + 3214 (type == TYPE_A ? 2 : 1); 3215 CHECKOOB(goto abrt); 3216 } 3217 } 3218 closedir(dirp); 3219 dirp = NULL; 3220 } 3221 3222 if (dout == NULL) 3223 reply(550, "No files found."); 3224 else if (ferror(dout)) 3225 data_err: perror_reply(550, "Data connection"); 3226 else 3227 reply(226, "Transfer complete."); 3228 out: 3229 if (dout) { 3230 ENDXFER; 3231 abrt: 3232 fclose(dout); 3233 data = -1; 3234 pdata = -1; 3235 } 3236 if (dirp) 3237 closedir(dirp); 3238 if (freeglob) { 3239 freeglob = 0; 3240 globfree(&gl); 3241 } 3242 } 3243 3244 void 3245 reapchild(int signo) 3246 { 3247 while (waitpid(-1, NULL, WNOHANG) > 0); 3248 } 3249 3250 static void 3251 appendf(char **strp, char *fmt, ...) 3252 { 3253 va_list ap; 3254 char *ostr, *p; 3255 3256 va_start(ap, fmt); 3257 vasprintf(&p, fmt, ap); 3258 va_end(ap); 3259 if (p == NULL) 3260 fatalerror("Ran out of memory."); 3261 if (*strp == NULL) 3262 *strp = p; 3263 else { 3264 ostr = *strp; 3265 asprintf(strp, "%s%s", ostr, p); 3266 if (*strp == NULL) 3267 fatalerror("Ran out of memory."); 3268 free(ostr); 3269 } 3270 } 3271 3272 static void 3273 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3274 { 3275 char *msg = NULL; 3276 char wd[MAXPATHLEN + 1]; 3277 3278 if (logging <= 1) 3279 return; 3280 3281 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3282 strcpy(wd, strerror(errno)); 3283 3284 appendf(&msg, "%s", cmd); 3285 if (file1) 3286 appendf(&msg, " %s", file1); 3287 if (file2) 3288 appendf(&msg, " %s", file2); 3289 if (cnt >= 0) 3290 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3291 appendf(&msg, " (wd: %s", wd); 3292 if (guest || dochroot) 3293 appendf(&msg, "; chrooted"); 3294 appendf(&msg, ")"); 3295 syslog(LOG_INFO, "%s", msg); 3296 free(msg); 3297 } 3298 3299 static void 3300 logxfer(char *name, off_t size, time_t start) 3301 { 3302 char buf[MAXPATHLEN + 1024]; 3303 char path[MAXPATHLEN + 1]; 3304 time_t now; 3305 3306 if (statfd >= 0) { 3307 time(&now); 3308 if (realpath(name, path) == NULL) { 3309 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3310 return; 3311 } 3312 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3313 ctime(&now)+4, ident, remotehost, 3314 path, (intmax_t)size, 3315 (long)(now - start + (now == start))); 3316 write(statfd, buf, strlen(buf)); 3317 } 3318 } 3319 3320 static char * 3321 doublequote(char *s) 3322 { 3323 int n; 3324 char *p, *s2; 3325 3326 for (p = s, n = 0; *p; p++) 3327 if (*p == '"') 3328 n++; 3329 3330 if ((s2 = malloc(p - s + n + 1)) == NULL) 3331 return (NULL); 3332 3333 for (p = s2; *s; s++, p++) { 3334 if ((*p = *s) == '"') 3335 *(++p) = '"'; 3336 } 3337 *p = '\0'; 3338 3339 return (s2); 3340 } 3341 3342 /* setup server socket for specified address family */ 3343 /* if af is PF_UNSPEC more than one socket may be returned */ 3344 /* the returned list is dynamically allocated, so caller needs to free it */ 3345 static int * 3346 socksetup(int af, char *bindname, const char *bindport) 3347 { 3348 struct addrinfo hints, *res, *r; 3349 int error, maxs, *s, *socks; 3350 const int on = 1; 3351 3352 memset(&hints, 0, sizeof(hints)); 3353 hints.ai_flags = AI_PASSIVE; 3354 hints.ai_family = af; 3355 hints.ai_socktype = SOCK_STREAM; 3356 error = getaddrinfo(bindname, bindport, &hints, &res); 3357 if (error) { 3358 syslog(LOG_ERR, "%s", gai_strerror(error)); 3359 if (error == EAI_SYSTEM) 3360 syslog(LOG_ERR, "%s", strerror(errno)); 3361 return NULL; 3362 } 3363 3364 /* Count max number of sockets we may open */ 3365 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3366 ; 3367 socks = malloc((maxs + 1) * sizeof(int)); 3368 if (!socks) { 3369 freeaddrinfo(res); 3370 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3371 return NULL; 3372 } 3373 3374 *socks = 0; /* num of sockets counter at start of array */ 3375 s = socks + 1; 3376 for (r = res; r; r = r->ai_next) { 3377 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3378 if (*s < 0) { 3379 syslog(LOG_DEBUG, "control socket: %m"); 3380 continue; 3381 } 3382 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3383 &on, sizeof(on)) < 0) 3384 syslog(LOG_WARNING, 3385 "control setsockopt (SO_REUSEADDR): %m"); 3386 if (r->ai_family == AF_INET6) { 3387 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3388 &on, sizeof(on)) < 0) 3389 syslog(LOG_WARNING, 3390 "control setsockopt (IPV6_V6ONLY): %m"); 3391 } 3392 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3393 syslog(LOG_DEBUG, "control bind: %m"); 3394 close(*s); 3395 continue; 3396 } 3397 (*socks)++; 3398 s++; 3399 } 3400 3401 if (res) 3402 freeaddrinfo(res); 3403 3404 if (*socks == 0) { 3405 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3406 free(socks); 3407 return NULL; 3408 } 3409 return(socks); 3410 } 3411