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