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 reply(550, "Can't set uid."); 1516 goto bad; 1517 } 1518 if (chdir(homedir) < 0) { 1519 if (guest || dochroot) { 1520 reply(550, "Can't change to base directory."); 1521 goto bad; 1522 } else { 1523 if (chdir("/") < 0) { 1524 reply(550, "Root is inaccessible."); 1525 goto bad; 1526 } 1527 lreply(230, "No directory! Logging in with home=/."); 1528 } 1529 } 1530 1531 /* 1532 * Display a login message, if it exists. 1533 * N.B. reply(230,) must follow the message. 1534 */ 1535 #ifdef VIRTUAL_HOSTING 1536 fd = fopen(thishost->loginmsg, "r"); 1537 #else 1538 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1539 #endif 1540 if (fd != NULL) { 1541 char *cp, line[LINE_MAX]; 1542 1543 while (fgets(line, sizeof(line), fd) != NULL) { 1544 if ((cp = strchr(line, '\n')) != NULL) 1545 *cp = '\0'; 1546 lreply(230, "%s", line); 1547 } 1548 fflush(stdout); 1549 fclose(fd); 1550 } 1551 if (guest) { 1552 if (ident != NULL) 1553 free(ident); 1554 ident = strdup(passwd); 1555 if (ident == NULL) 1556 fatalerror("Ran out of memory."); 1557 1558 reply(230, "Guest login ok, access restrictions apply."); 1559 #ifdef SETPROCTITLE 1560 #ifdef VIRTUAL_HOSTING 1561 if (thishost != firsthost) 1562 snprintf(proctitle, sizeof(proctitle), 1563 "%s: anonymous(%s)/%s", remotehost, hostname, 1564 passwd); 1565 else 1566 #endif 1567 snprintf(proctitle, sizeof(proctitle), 1568 "%s: anonymous/%s", remotehost, passwd); 1569 setproctitle("%s", proctitle); 1570 #endif /* SETPROCTITLE */ 1571 if (logging) 1572 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1573 remotehost, passwd); 1574 } else { 1575 if (dochroot) 1576 reply(230, "User %s logged in, " 1577 "access restrictions apply.", pw->pw_name); 1578 else 1579 reply(230, "User %s logged in.", pw->pw_name); 1580 1581 #ifdef SETPROCTITLE 1582 snprintf(proctitle, sizeof(proctitle), 1583 "%s: user/%s", remotehost, pw->pw_name); 1584 setproctitle("%s", proctitle); 1585 #endif /* SETPROCTITLE */ 1586 if (logging) 1587 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1588 remotehost, pw->pw_name); 1589 } 1590 if (logging && (guest || dochroot)) 1591 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1592 #ifdef LOGIN_CAP 1593 login_close(lc); 1594 #endif 1595 if (residue) 1596 free(residue); 1597 return; 1598 bad: 1599 /* Forget all about it... */ 1600 #ifdef LOGIN_CAP 1601 login_close(lc); 1602 #endif 1603 if (residue) 1604 free(residue); 1605 end_login(); 1606 } 1607 1608 void 1609 retrieve(char *cmd, char *name) 1610 { 1611 FILE *fin, *dout; 1612 struct stat st; 1613 int (*closefunc)(FILE *); 1614 time_t start; 1615 1616 if (cmd == NULL) { 1617 fin = fopen(name, "r"), closefunc = fclose; 1618 st.st_size = 0; 1619 } else { 1620 char line[BUFSIZ]; 1621 1622 snprintf(line, sizeof(line), cmd, name), name = line; 1623 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1624 st.st_size = -1; 1625 st.st_blksize = BUFSIZ; 1626 } 1627 if (fin == NULL) { 1628 if (errno != 0) { 1629 perror_reply(550, name); 1630 if (cmd == NULL) { 1631 LOGCMD("get", name); 1632 } 1633 } 1634 return; 1635 } 1636 byte_count = -1; 1637 if (cmd == NULL) { 1638 if (fstat(fileno(fin), &st) < 0) { 1639 perror_reply(550, name); 1640 goto done; 1641 } 1642 if (!S_ISREG(st.st_mode)) { 1643 /* 1644 * Never sending a raw directory is a workaround 1645 * for buggy clients that will attempt to RETR 1646 * a directory before listing it, e.g., Mozilla. 1647 * Preventing a guest from getting irregular files 1648 * is a simple security measure. 1649 */ 1650 if (S_ISDIR(st.st_mode) || guest) { 1651 reply(550, "%s: not a plain file.", name); 1652 goto done; 1653 } 1654 st.st_size = -1; 1655 /* st.st_blksize is set for all descriptor types */ 1656 } 1657 } 1658 if (restart_point) { 1659 if (type == TYPE_A) { 1660 off_t i, n; 1661 int c; 1662 1663 n = restart_point; 1664 i = 0; 1665 while (i++ < n) { 1666 if ((c=getc(fin)) == EOF) { 1667 perror_reply(550, name); 1668 goto done; 1669 } 1670 if (c == '\n') 1671 i++; 1672 } 1673 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1674 perror_reply(550, name); 1675 goto done; 1676 } 1677 } 1678 dout = dataconn(name, st.st_size, "w"); 1679 if (dout == NULL) 1680 goto done; 1681 time(&start); 1682 send_data(fin, dout, st.st_blksize, st.st_size, 1683 restart_point == 0 && cmd == NULL && S_ISREG(st.st_mode)); 1684 if (cmd == NULL && guest && stats && byte_count > 0) 1685 logxfer(name, byte_count, start); 1686 fclose(dout); 1687 data = -1; 1688 pdata = -1; 1689 done: 1690 if (cmd == NULL) 1691 LOGBYTES("get", name, byte_count); 1692 (*closefunc)(fin); 1693 } 1694 1695 void 1696 store(char *name, char *mode, int unique) 1697 { 1698 int fd; 1699 FILE *fout, *din; 1700 int (*closefunc)(FILE *); 1701 1702 if (*mode == 'a') { /* APPE */ 1703 if (unique) { 1704 /* Programming error */ 1705 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1706 unique = 0; 1707 } 1708 if (guest && noguestmod) { 1709 reply(550, "Appending to existing file denied."); 1710 goto err; 1711 } 1712 restart_point = 0; /* not affected by preceding REST */ 1713 } 1714 if (unique) /* STOU overrides REST */ 1715 restart_point = 0; 1716 if (guest && noguestmod) { 1717 if (restart_point) { /* guest STOR w/REST */ 1718 reply(550, "Modifying existing file denied."); 1719 goto err; 1720 } else /* treat guest STOR as STOU */ 1721 unique = 1; 1722 } 1723 1724 if (restart_point) 1725 mode = "r+"; /* so ASCII manual seek can work */ 1726 if (unique) { 1727 if ((fd = guniquefd(name, &name)) < 0) 1728 goto err; 1729 fout = fdopen(fd, mode); 1730 } else 1731 fout = fopen(name, mode); 1732 closefunc = fclose; 1733 if (fout == NULL) { 1734 perror_reply(553, name); 1735 goto err; 1736 } 1737 byte_count = -1; 1738 if (restart_point) { 1739 if (type == TYPE_A) { 1740 off_t i, n; 1741 int c; 1742 1743 n = restart_point; 1744 i = 0; 1745 while (i++ < n) { 1746 if ((c=getc(fout)) == EOF) { 1747 perror_reply(550, name); 1748 goto done; 1749 } 1750 if (c == '\n') 1751 i++; 1752 } 1753 /* 1754 * We must do this seek to "current" position 1755 * because we are changing from reading to 1756 * writing. 1757 */ 1758 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1759 perror_reply(550, name); 1760 goto done; 1761 } 1762 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1763 perror_reply(550, name); 1764 goto done; 1765 } 1766 } 1767 din = dataconn(name, -1, "r"); 1768 if (din == NULL) 1769 goto done; 1770 if (receive_data(din, fout) == 0) { 1771 if (unique) 1772 reply(226, "Transfer complete (unique file name:%s).", 1773 name); 1774 else 1775 reply(226, "Transfer complete."); 1776 } 1777 fclose(din); 1778 data = -1; 1779 pdata = -1; 1780 done: 1781 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1782 (*closefunc)(fout); 1783 return; 1784 err: 1785 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1786 return; 1787 } 1788 1789 static FILE * 1790 getdatasock(char *mode) 1791 { 1792 int on = 1, s, t, tries; 1793 1794 if (data >= 0) 1795 return (fdopen(data, mode)); 1796 1797 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1798 if (s < 0) 1799 goto bad; 1800 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1801 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1802 /* anchor socket to avoid multi-homing problems */ 1803 data_source = ctrl_addr; 1804 data_source.su_port = htons(dataport); 1805 seteuid(0); 1806 for (tries = 1; ; tries++) { 1807 /* 1808 * We should loop here since it's possible that 1809 * another ftpd instance has passed this point and is 1810 * trying to open a data connection in active mode now. 1811 * Until the other connection is opened, we'll be getting 1812 * EADDRINUSE because no SOCK_STREAM sockets in the system 1813 * can share both local and remote addresses, localIP:20 1814 * and *:* in this case. 1815 */ 1816 if (bind(s, (struct sockaddr *)&data_source, 1817 data_source.su_len) >= 0) 1818 break; 1819 if (errno != EADDRINUSE || tries > 10) 1820 goto bad; 1821 sleep(tries); 1822 } 1823 seteuid(pw->pw_uid); 1824 #ifdef IP_TOS 1825 if (data_source.su_family == AF_INET) 1826 { 1827 on = IPTOS_THROUGHPUT; 1828 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1829 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1830 } 1831 #endif 1832 #ifdef TCP_NOPUSH 1833 /* 1834 * Turn off push flag to keep sender TCP from sending short packets 1835 * at the boundaries of each write(). 1836 */ 1837 on = 1; 1838 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1839 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1840 #endif 1841 return (fdopen(s, mode)); 1842 bad: 1843 /* Return the real value of errno (close may change it) */ 1844 t = errno; 1845 seteuid(pw->pw_uid); 1846 close(s); 1847 errno = t; 1848 return (NULL); 1849 } 1850 1851 static FILE * 1852 dataconn(char *name, off_t size, char *mode) 1853 { 1854 char sizebuf[32]; 1855 FILE *file; 1856 int retry = 0, tos, conerrno; 1857 1858 file_size = size; 1859 byte_count = 0; 1860 if (size != -1) 1861 snprintf(sizebuf, sizeof(sizebuf), 1862 " (%jd bytes)", (intmax_t)size); 1863 else 1864 *sizebuf = '\0'; 1865 if (pdata >= 0) { 1866 union sockunion from; 1867 socklen_t fromlen = ctrl_addr.su_len; 1868 int flags, s; 1869 struct timeval timeout; 1870 fd_set set; 1871 1872 FD_ZERO(&set); 1873 FD_SET(pdata, &set); 1874 1875 timeout.tv_usec = 0; 1876 timeout.tv_sec = 120; 1877 1878 /* 1879 * Granted a socket is in the blocking I/O mode, 1880 * accept() will block after a successful select() 1881 * if the selected connection dies in between. 1882 * Therefore set the non-blocking I/O flag here. 1883 */ 1884 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1885 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1886 goto pdata_err; 1887 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1888 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1889 goto pdata_err; 1890 close(pdata); 1891 pdata = s; 1892 /* 1893 * Unset the inherited non-blocking I/O flag 1894 * on the child socket so stdio can work on it. 1895 */ 1896 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1897 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1898 goto pdata_err; 1899 #ifdef IP_TOS 1900 if (from.su_family == AF_INET) 1901 { 1902 tos = IPTOS_THROUGHPUT; 1903 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1904 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1905 } 1906 #endif 1907 reply(150, "Opening %s mode data connection for '%s'%s.", 1908 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1909 return (fdopen(pdata, mode)); 1910 pdata_err: 1911 reply(425, "Can't open data connection."); 1912 close(pdata); 1913 pdata = -1; 1914 return (NULL); 1915 } 1916 if (data >= 0) { 1917 reply(125, "Using existing data connection for '%s'%s.", 1918 name, sizebuf); 1919 usedefault = 1; 1920 return (fdopen(data, mode)); 1921 } 1922 if (usedefault) 1923 data_dest = his_addr; 1924 usedefault = 1; 1925 do { 1926 file = getdatasock(mode); 1927 if (file == NULL) { 1928 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1929 1930 if (getnameinfo((struct sockaddr *)&data_source, 1931 data_source.su_len, 1932 hostbuf, sizeof(hostbuf) - 1, 1933 portbuf, sizeof(portbuf) - 1, 1934 NI_NUMERICHOST|NI_NUMERICSERV)) 1935 *hostbuf = *portbuf = 0; 1936 hostbuf[sizeof(hostbuf) - 1] = 0; 1937 portbuf[sizeof(portbuf) - 1] = 0; 1938 reply(425, "Can't create data socket (%s,%s): %s.", 1939 hostbuf, portbuf, strerror(errno)); 1940 return (NULL); 1941 } 1942 data = fileno(file); 1943 conerrno = 0; 1944 if (connect(data, (struct sockaddr *)&data_dest, 1945 data_dest.su_len) == 0) 1946 break; 1947 conerrno = errno; 1948 fclose(file); 1949 data = -1; 1950 if (conerrno == EADDRINUSE) { 1951 sleep(swaitint); 1952 retry += swaitint; 1953 } else { 1954 break; 1955 } 1956 } while (retry <= swaitmax); 1957 if (conerrno != 0) { 1958 reply(425, "Can't build data connection: %s.", 1959 strerror(conerrno)); 1960 return (NULL); 1961 } 1962 reply(150, "Opening %s mode data connection for '%s'%s.", 1963 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1964 return (file); 1965 } 1966 1967 /* 1968 * A helper macro to avoid code duplication 1969 * in send_data() and receive_data(). 1970 * 1971 * XXX We have to block SIGURG during putc() because BSD stdio 1972 * is unable to restart interrupted write operations and hence 1973 * the entire buffer contents will be lost as soon as a write() 1974 * call indicates EINTR to stdio. 1975 */ 1976 #define FTPD_PUTC(ch, file, label) \ 1977 do { \ 1978 int ret; \ 1979 \ 1980 do { \ 1981 START_UNSAFE; \ 1982 ret = putc((ch), (file)); \ 1983 END_UNSAFE; \ 1984 CHECKOOB(return (-1)) \ 1985 else if (ferror(file)) \ 1986 goto label; \ 1987 clearerr(file); \ 1988 } while (ret == EOF); \ 1989 } while (0) 1990 1991 /* 1992 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1993 * encapsulation of the data subject to Mode, Structure, and Type. 1994 * 1995 * NB: Form isn't handled. 1996 */ 1997 static int 1998 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 1999 { 2000 int c, cp, filefd, netfd; 2001 char *buf; 2002 2003 STARTXFER; 2004 2005 switch (type) { 2006 2007 case TYPE_A: 2008 cp = EOF; 2009 for (;;) { 2010 c = getc(instr); 2011 CHECKOOB(return (-1)) 2012 else if (c == EOF && ferror(instr)) 2013 goto file_err; 2014 if (c == EOF) { 2015 if (ferror(instr)) { /* resume after OOB */ 2016 clearerr(instr); 2017 continue; 2018 } 2019 if (feof(instr)) /* EOF */ 2020 break; 2021 syslog(LOG_ERR, "Internal: impossible condition" 2022 " on file after getc()"); 2023 goto file_err; 2024 } 2025 if (c == '\n' && cp != '\r') { 2026 FTPD_PUTC('\r', outstr, data_err); 2027 byte_count++; 2028 } 2029 FTPD_PUTC(c, outstr, data_err); 2030 byte_count++; 2031 cp = c; 2032 } 2033 #ifdef notyet /* BSD stdio isn't ready for that */ 2034 while (fflush(outstr) == EOF) { 2035 CHECKOOB(return (-1)) 2036 else 2037 goto data_err; 2038 clearerr(outstr); 2039 } 2040 ENDXFER; 2041 #else 2042 ENDXFER; 2043 if (fflush(outstr) == EOF) 2044 goto data_err; 2045 #endif 2046 reply(226, "Transfer complete."); 2047 return (0); 2048 2049 case TYPE_I: 2050 case TYPE_L: 2051 /* 2052 * isreg is only set if we are not doing restart and we 2053 * are sending a regular file 2054 */ 2055 netfd = fileno(outstr); 2056 filefd = fileno(instr); 2057 2058 if (isreg) { 2059 char *msg = "Transfer complete."; 2060 off_t cnt, offset; 2061 int err; 2062 2063 cnt = offset = 0; 2064 2065 while (filesize > 0) { 2066 err = sendfile(filefd, netfd, offset, 0, 2067 NULL, &cnt, 0); 2068 /* 2069 * Calculate byte_count before OOB processing. 2070 * It can be used in myoob() later. 2071 */ 2072 byte_count += cnt; 2073 offset += cnt; 2074 filesize -= cnt; 2075 CHECKOOB(return (-1)) 2076 else if (err == -1) { 2077 if (errno != EINTR && 2078 cnt == 0 && offset == 0) 2079 goto oldway; 2080 goto data_err; 2081 } 2082 if (err == -1) /* resume after OOB */ 2083 continue; 2084 /* 2085 * We hit the EOF prematurely. 2086 * Perhaps the file was externally truncated. 2087 */ 2088 if (cnt == 0) { 2089 msg = "Transfer finished due to " 2090 "premature end of file."; 2091 break; 2092 } 2093 } 2094 ENDXFER; 2095 reply(226, "%s", msg); 2096 return (0); 2097 } 2098 2099 oldway: 2100 if ((buf = malloc(blksize)) == NULL) { 2101 ENDXFER; 2102 reply(451, "Ran out of memory."); 2103 return (-1); 2104 } 2105 2106 for (;;) { 2107 int cnt, len; 2108 char *bp; 2109 2110 cnt = read(filefd, buf, blksize); 2111 CHECKOOB(free(buf); return (-1)) 2112 else if (cnt < 0) { 2113 free(buf); 2114 goto file_err; 2115 } 2116 if (cnt < 0) /* resume after OOB */ 2117 continue; 2118 if (cnt == 0) /* EOF */ 2119 break; 2120 for (len = cnt, bp = buf; len > 0;) { 2121 cnt = write(netfd, bp, len); 2122 CHECKOOB(free(buf); return (-1)) 2123 else if (cnt < 0) { 2124 free(buf); 2125 goto data_err; 2126 } 2127 if (cnt <= 0) 2128 continue; 2129 len -= cnt; 2130 bp += cnt; 2131 byte_count += cnt; 2132 } 2133 } 2134 ENDXFER; 2135 free(buf); 2136 reply(226, "Transfer complete."); 2137 return (0); 2138 default: 2139 ENDXFER; 2140 reply(550, "Unimplemented TYPE %d in send_data.", type); 2141 return (-1); 2142 } 2143 2144 data_err: 2145 ENDXFER; 2146 perror_reply(426, "Data connection"); 2147 return (-1); 2148 2149 file_err: 2150 ENDXFER; 2151 perror_reply(551, "Error on input file"); 2152 return (-1); 2153 } 2154 2155 /* 2156 * Transfer data from peer to "outstr" using the appropriate encapulation of 2157 * the data subject to Mode, Structure, and Type. 2158 * 2159 * N.B.: Form isn't handled. 2160 */ 2161 static int 2162 receive_data(FILE *instr, FILE *outstr) 2163 { 2164 int c, cp; 2165 int bare_lfs = 0; 2166 2167 STARTXFER; 2168 2169 switch (type) { 2170 2171 case TYPE_I: 2172 case TYPE_L: 2173 for (;;) { 2174 int cnt, len; 2175 char *bp; 2176 char buf[BUFSIZ]; 2177 2178 cnt = read(fileno(instr), buf, sizeof(buf)); 2179 CHECKOOB(return (-1)) 2180 else if (cnt < 0) 2181 goto data_err; 2182 if (cnt < 0) /* resume after OOB */ 2183 continue; 2184 if (cnt == 0) /* EOF */ 2185 break; 2186 for (len = cnt, bp = buf; len > 0;) { 2187 cnt = write(fileno(outstr), bp, len); 2188 CHECKOOB(return (-1)) 2189 else if (cnt < 0) 2190 goto file_err; 2191 if (cnt <= 0) 2192 continue; 2193 len -= cnt; 2194 bp += cnt; 2195 byte_count += cnt; 2196 } 2197 } 2198 ENDXFER; 2199 return (0); 2200 2201 case TYPE_E: 2202 ENDXFER; 2203 reply(553, "TYPE E not implemented."); 2204 return (-1); 2205 2206 case TYPE_A: 2207 cp = EOF; 2208 for (;;) { 2209 c = getc(instr); 2210 CHECKOOB(return (-1)) 2211 else if (c == EOF && ferror(instr)) 2212 goto data_err; 2213 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2214 clearerr(instr); 2215 continue; 2216 } 2217 2218 if (cp == '\r') { 2219 if (c != '\n') 2220 FTPD_PUTC('\r', outstr, file_err); 2221 } else 2222 if (c == '\n') 2223 bare_lfs++; 2224 if (c == '\r') { 2225 byte_count++; 2226 cp = c; 2227 continue; 2228 } 2229 2230 /* Check for EOF here in order not to lose last \r. */ 2231 if (c == EOF) { 2232 if (feof(instr)) /* EOF */ 2233 break; 2234 syslog(LOG_ERR, "Internal: impossible condition" 2235 " on data stream after getc()"); 2236 goto data_err; 2237 } 2238 2239 byte_count++; 2240 FTPD_PUTC(c, outstr, file_err); 2241 cp = c; 2242 } 2243 #ifdef notyet /* BSD stdio isn't ready for that */ 2244 while (fflush(outstr) == EOF) { 2245 CHECKOOB(return (-1)) 2246 else 2247 goto file_err; 2248 clearerr(outstr); 2249 } 2250 ENDXFER; 2251 #else 2252 ENDXFER; 2253 if (fflush(outstr) == EOF) 2254 goto file_err; 2255 #endif 2256 if (bare_lfs) { 2257 lreply(226, 2258 "WARNING! %d bare linefeeds received in ASCII mode.", 2259 bare_lfs); 2260 printf(" File may not have transferred correctly.\r\n"); 2261 } 2262 return (0); 2263 default: 2264 ENDXFER; 2265 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2266 return (-1); 2267 } 2268 2269 data_err: 2270 ENDXFER; 2271 perror_reply(426, "Data connection"); 2272 return (-1); 2273 2274 file_err: 2275 ENDXFER; 2276 perror_reply(452, "Error writing to file"); 2277 return (-1); 2278 } 2279 2280 void 2281 statfilecmd(char *filename) 2282 { 2283 FILE *fin; 2284 int atstart; 2285 int c, code; 2286 char line[LINE_MAX]; 2287 struct stat st; 2288 2289 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2290 snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2291 fin = ftpd_popen(line, "r"); 2292 lreply(code, "Status of %s:", filename); 2293 atstart = 1; 2294 while ((c = getc(fin)) != EOF) { 2295 if (c == '\n') { 2296 if (ferror(stdout)){ 2297 perror_reply(421, "Control connection"); 2298 ftpd_pclose(fin); 2299 dologout(1); 2300 /* NOTREACHED */ 2301 } 2302 if (ferror(fin)) { 2303 perror_reply(551, filename); 2304 ftpd_pclose(fin); 2305 return; 2306 } 2307 putc('\r', stdout); 2308 } 2309 /* 2310 * RFC 959 says neutral text should be prepended before 2311 * a leading 3-digit number followed by whitespace, but 2312 * many ftp clients can be confused by any leading digits, 2313 * as a matter of fact. 2314 */ 2315 if (atstart && isdigit(c)) 2316 putc(' ', stdout); 2317 putc(c, stdout); 2318 atstart = (c == '\n'); 2319 } 2320 ftpd_pclose(fin); 2321 reply(code, "End of status."); 2322 } 2323 2324 void 2325 statcmd(void) 2326 { 2327 union sockunion *su; 2328 u_char *a, *p; 2329 char hname[NI_MAXHOST]; 2330 int ispassive; 2331 2332 if (hostinfo) { 2333 lreply(211, "%s FTP server status:", hostname); 2334 printf(" %s\r\n", version); 2335 } else 2336 lreply(211, "FTP server status:"); 2337 printf(" Connected to %s", remotehost); 2338 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2339 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2340 hname[sizeof(hname) - 1] = 0; 2341 if (strcmp(hname, remotehost) != 0) 2342 printf(" (%s)", hname); 2343 } 2344 printf("\r\n"); 2345 if (logged_in) { 2346 if (guest) 2347 printf(" Logged in anonymously\r\n"); 2348 else 2349 printf(" Logged in as %s\r\n", pw->pw_name); 2350 } else if (askpasswd) 2351 printf(" Waiting for password\r\n"); 2352 else 2353 printf(" Waiting for user name\r\n"); 2354 printf(" TYPE: %s", typenames[type]); 2355 if (type == TYPE_A || type == TYPE_E) 2356 printf(", FORM: %s", formnames[form]); 2357 if (type == TYPE_L) 2358 #if CHAR_BIT == 8 2359 printf(" %d", CHAR_BIT); 2360 #else 2361 printf(" %d", bytesize); /* need definition! */ 2362 #endif 2363 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2364 strunames[stru], modenames[mode]); 2365 if (data != -1) 2366 printf(" Data connection open\r\n"); 2367 else if (pdata != -1) { 2368 ispassive = 1; 2369 su = &pasv_addr; 2370 goto printaddr; 2371 } else if (usedefault == 0) { 2372 ispassive = 0; 2373 su = &data_dest; 2374 printaddr: 2375 #define UC(b) (((int) b) & 0xff) 2376 if (epsvall) { 2377 printf(" EPSV only mode (EPSV ALL)\r\n"); 2378 goto epsvonly; 2379 } 2380 2381 /* PORT/PASV */ 2382 if (su->su_family == AF_INET) { 2383 a = (u_char *) &su->su_sin.sin_addr; 2384 p = (u_char *) &su->su_sin.sin_port; 2385 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2386 ispassive ? "PASV" : "PORT", 2387 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2388 UC(p[0]), UC(p[1])); 2389 } 2390 2391 /* LPRT/LPSV */ 2392 { 2393 int alen, af, i; 2394 2395 switch (su->su_family) { 2396 case AF_INET: 2397 a = (u_char *) &su->su_sin.sin_addr; 2398 p = (u_char *) &su->su_sin.sin_port; 2399 alen = sizeof(su->su_sin.sin_addr); 2400 af = 4; 2401 break; 2402 case AF_INET6: 2403 a = (u_char *) &su->su_sin6.sin6_addr; 2404 p = (u_char *) &su->su_sin6.sin6_port; 2405 alen = sizeof(su->su_sin6.sin6_addr); 2406 af = 6; 2407 break; 2408 default: 2409 af = 0; 2410 break; 2411 } 2412 if (af) { 2413 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2414 af, alen); 2415 for (i = 0; i < alen; i++) 2416 printf("%d,", UC(a[i])); 2417 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2418 } 2419 } 2420 2421 epsvonly:; 2422 /* EPRT/EPSV */ 2423 { 2424 int af; 2425 2426 switch (su->su_family) { 2427 case AF_INET: 2428 af = 1; 2429 break; 2430 case AF_INET6: 2431 af = 2; 2432 break; 2433 default: 2434 af = 0; 2435 break; 2436 } 2437 if (af) { 2438 union sockunion tmp; 2439 2440 tmp = *su; 2441 if (tmp.su_family == AF_INET6) 2442 tmp.su_sin6.sin6_scope_id = 0; 2443 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2444 hname, sizeof(hname) - 1, NULL, 0, 2445 NI_NUMERICHOST)) { 2446 hname[sizeof(hname) - 1] = 0; 2447 printf(" %s |%d|%s|%d|\r\n", 2448 ispassive ? "EPSV" : "EPRT", 2449 af, hname, htons(tmp.su_port)); 2450 } 2451 } 2452 } 2453 #undef UC 2454 } else 2455 printf(" No data connection\r\n"); 2456 reply(211, "End of status."); 2457 } 2458 2459 void 2460 fatalerror(char *s) 2461 { 2462 2463 reply(451, "Error in server: %s", s); 2464 reply(221, "Closing connection due to server error."); 2465 dologout(0); 2466 /* NOTREACHED */ 2467 } 2468 2469 void 2470 reply(int n, const char *fmt, ...) 2471 { 2472 va_list ap; 2473 2474 printf("%d ", n); 2475 va_start(ap, fmt); 2476 vprintf(fmt, ap); 2477 va_end(ap); 2478 printf("\r\n"); 2479 fflush(stdout); 2480 if (ftpdebug) { 2481 syslog(LOG_DEBUG, "<--- %d ", n); 2482 va_start(ap, fmt); 2483 vsyslog(LOG_DEBUG, fmt, ap); 2484 va_end(ap); 2485 } 2486 } 2487 2488 void 2489 lreply(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 static void 2508 ack(char *s) 2509 { 2510 2511 reply(250, "%s command successful.", s); 2512 } 2513 2514 void 2515 nack(char *s) 2516 { 2517 2518 reply(502, "%s command not implemented.", s); 2519 } 2520 2521 /* ARGSUSED */ 2522 void 2523 yyerror(char *s) 2524 { 2525 char *cp; 2526 2527 if ((cp = strchr(cbuf,'\n'))) 2528 *cp = '\0'; 2529 reply(500, "%s: command not understood.", cbuf); 2530 } 2531 2532 void 2533 delete(char *name) 2534 { 2535 struct stat st; 2536 2537 LOGCMD("delete", name); 2538 if (lstat(name, &st) < 0) { 2539 perror_reply(550, name); 2540 return; 2541 } 2542 if (S_ISDIR(st.st_mode)) { 2543 if (rmdir(name) < 0) { 2544 perror_reply(550, name); 2545 return; 2546 } 2547 goto done; 2548 } 2549 if (guest && noguestmod) { 2550 reply(550, "Operation not permitted."); 2551 return; 2552 } 2553 if (unlink(name) < 0) { 2554 perror_reply(550, name); 2555 return; 2556 } 2557 done: 2558 ack("DELE"); 2559 } 2560 2561 void 2562 cwd(char *path) 2563 { 2564 2565 if (chdir(path) < 0) 2566 perror_reply(550, path); 2567 else 2568 ack("CWD"); 2569 } 2570 2571 void 2572 makedir(char *name) 2573 { 2574 char *s; 2575 2576 LOGCMD("mkdir", name); 2577 if (guest && noguestmkd) 2578 reply(550, "Operation not permitted."); 2579 else if (mkdir(name, 0777) < 0) 2580 perror_reply(550, name); 2581 else { 2582 if ((s = doublequote(name)) == NULL) 2583 fatalerror("Ran out of memory."); 2584 reply(257, "\"%s\" directory created.", s); 2585 free(s); 2586 } 2587 } 2588 2589 void 2590 removedir(char *name) 2591 { 2592 2593 LOGCMD("rmdir", name); 2594 if (rmdir(name) < 0) 2595 perror_reply(550, name); 2596 else 2597 ack("RMD"); 2598 } 2599 2600 void 2601 pwd(void) 2602 { 2603 char *s, path[MAXPATHLEN + 1]; 2604 2605 if (getcwd(path, sizeof(path)) == NULL) 2606 perror_reply(550, "Get current directory"); 2607 else { 2608 if ((s = doublequote(path)) == NULL) 2609 fatalerror("Ran out of memory."); 2610 reply(257, "\"%s\" is current directory.", s); 2611 free(s); 2612 } 2613 } 2614 2615 char * 2616 renamefrom(char *name) 2617 { 2618 struct stat st; 2619 2620 if (guest && noguestmod) { 2621 reply(550, "Operation not permitted."); 2622 return (NULL); 2623 } 2624 if (lstat(name, &st) < 0) { 2625 perror_reply(550, name); 2626 return (NULL); 2627 } 2628 reply(350, "File exists, ready for destination name."); 2629 return (name); 2630 } 2631 2632 void 2633 renamecmd(char *from, char *to) 2634 { 2635 struct stat st; 2636 2637 LOGCMD2("rename", from, to); 2638 2639 if (guest && (stat(to, &st) == 0)) { 2640 reply(550, "%s: permission denied.", to); 2641 return; 2642 } 2643 2644 if (rename(from, to) < 0) 2645 perror_reply(550, "rename"); 2646 else 2647 ack("RNTO"); 2648 } 2649 2650 static void 2651 dolog(struct sockaddr *who) 2652 { 2653 char who_name[NI_MAXHOST]; 2654 2655 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2656 remotehost[sizeof(remotehost) - 1] = 0; 2657 if (getnameinfo(who, who->sa_len, 2658 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2659 *who_name = 0; 2660 who_name[sizeof(who_name) - 1] = 0; 2661 2662 #ifdef SETPROCTITLE 2663 #ifdef VIRTUAL_HOSTING 2664 if (thishost != firsthost) 2665 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2666 remotehost, hostname); 2667 else 2668 #endif 2669 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2670 remotehost); 2671 setproctitle("%s", proctitle); 2672 #endif /* SETPROCTITLE */ 2673 2674 if (logging) { 2675 #ifdef VIRTUAL_HOSTING 2676 if (thishost != firsthost) 2677 syslog(LOG_INFO, "connection from %s (%s) to %s", 2678 remotehost, who_name, hostname); 2679 else 2680 #endif 2681 syslog(LOG_INFO, "connection from %s (%s)", 2682 remotehost, who_name); 2683 } 2684 } 2685 2686 /* 2687 * Record logout in wtmpx file 2688 * and exit with supplied status. 2689 */ 2690 void 2691 dologout(int status) 2692 { 2693 2694 if (logged_in && dowtmpx) { 2695 seteuid(0); 2696 ftpd_logwtmpx(ttyline, "", NULL); 2697 } 2698 /* beware of flushing buffers after a SIGPIPE */ 2699 _exit(status); 2700 } 2701 2702 static void 2703 sigurg(int signo) 2704 { 2705 2706 recvurg = 1; 2707 } 2708 2709 static void 2710 maskurg(int flag) 2711 { 2712 int oerrno; 2713 sigset_t sset; 2714 2715 if (!transflag) { 2716 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2717 return; 2718 } 2719 oerrno = errno; 2720 sigemptyset(&sset); 2721 sigaddset(&sset, SIGURG); 2722 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2723 errno = oerrno; 2724 } 2725 2726 static void 2727 flagxfer(int flag) 2728 { 2729 2730 if (flag) { 2731 if (transflag) 2732 syslog(LOG_ERR, "Internal: flagxfer(1): " 2733 "transfer already under way"); 2734 transflag = 1; 2735 maskurg(0); 2736 recvurg = 0; 2737 } else { 2738 if (!transflag) 2739 syslog(LOG_ERR, "Internal: flagxfer(0): " 2740 "no active transfer"); 2741 maskurg(1); 2742 transflag = 0; 2743 } 2744 } 2745 2746 /* 2747 * Returns 0 if OK to resume or -1 if abort requested. 2748 */ 2749 static int 2750 myoob(void) 2751 { 2752 char *cp; 2753 int ret; 2754 2755 if (!transflag) { 2756 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2757 return (0); 2758 } 2759 cp = tmpline; 2760 ret = get_line(cp, 7, stdin); 2761 if (ret == -1) { 2762 reply(221, "You could at least say goodbye."); 2763 dologout(0); 2764 } else if (ret == -2) { 2765 /* Ignore truncated command. */ 2766 return (0); 2767 } 2768 upper(cp); 2769 if (strcmp(cp, "ABOR\r\n") == 0) { 2770 tmpline[0] = '\0'; 2771 reply(426, "Transfer aborted. Data connection closed."); 2772 reply(226, "Abort successful."); 2773 return (-1); 2774 } 2775 if (strcmp(cp, "STAT\r\n") == 0) { 2776 tmpline[0] = '\0'; 2777 if (file_size != -1) 2778 reply(213, "Status: %jd of %jd bytes transferred.", 2779 (intmax_t)byte_count, (intmax_t)file_size); 2780 else 2781 reply(213, "Status: %jd bytes transferred.", 2782 (intmax_t)byte_count); 2783 } 2784 return (0); 2785 } 2786 2787 /* 2788 * Note: a response of 425 is not mentioned as a possible response to 2789 * the PASV command in RFC959. However, it has been blessed as 2790 * a legitimate response by Jon Postel in a telephone conversation 2791 * with Rick Adams on 25 Jan 89. 2792 */ 2793 void 2794 passive(void) 2795 { 2796 socklen_t len; 2797 int on; 2798 char *p, *a; 2799 2800 if (pdata >= 0) /* close old port if one set */ 2801 close(pdata); 2802 2803 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2804 if (pdata < 0) { 2805 perror_reply(425, "Can't open passive connection"); 2806 return; 2807 } 2808 on = 1; 2809 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2810 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2811 2812 seteuid(0); 2813 2814 #ifdef IP_PORTRANGE 2815 if (ctrl_addr.su_family == AF_INET) { 2816 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2817 : IP_PORTRANGE_DEFAULT; 2818 2819 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2820 &on, sizeof(on)) < 0) 2821 goto pasv_error; 2822 } 2823 #endif 2824 #ifdef IPV6_PORTRANGE 2825 if (ctrl_addr.su_family == AF_INET6) { 2826 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2827 : IPV6_PORTRANGE_DEFAULT; 2828 2829 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2830 &on, sizeof(on)) < 0) 2831 goto pasv_error; 2832 } 2833 #endif 2834 2835 pasv_addr = ctrl_addr; 2836 pasv_addr.su_port = 0; 2837 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2838 goto pasv_error; 2839 2840 seteuid(pw->pw_uid); 2841 2842 len = sizeof(pasv_addr); 2843 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2844 goto pasv_error; 2845 if (listen(pdata, 1) < 0) 2846 goto pasv_error; 2847 if (pasv_addr.su_family == AF_INET) 2848 a = (char *) &pasv_addr.su_sin.sin_addr; 2849 else if (pasv_addr.su_family == AF_INET6 && 2850 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2851 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2852 else 2853 goto pasv_error; 2854 2855 p = (char *) &pasv_addr.su_port; 2856 2857 #define UC(b) (((int) b) & 0xff) 2858 2859 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2860 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2861 return; 2862 2863 pasv_error: 2864 seteuid(pw->pw_uid); 2865 close(pdata); 2866 pdata = -1; 2867 perror_reply(425, "Can't open passive connection"); 2868 return; 2869 } 2870 2871 /* 2872 * Long Passive defined in RFC 1639. 2873 * 228 Entering Long Passive Mode 2874 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2875 */ 2876 2877 void 2878 long_passive(char *cmd, int pf) 2879 { 2880 socklen_t len; 2881 int on; 2882 char *p, *a; 2883 2884 if (pdata >= 0) /* close old port if one set */ 2885 close(pdata); 2886 2887 if (pf != PF_UNSPEC) { 2888 if (ctrl_addr.su_family != pf) { 2889 switch (ctrl_addr.su_family) { 2890 case AF_INET: 2891 pf = 1; 2892 break; 2893 case AF_INET6: 2894 pf = 2; 2895 break; 2896 default: 2897 pf = 0; 2898 break; 2899 } 2900 /* 2901 * XXX 2902 * only EPRT/EPSV ready clients will understand this 2903 */ 2904 if (strcmp(cmd, "EPSV") == 0 && pf) { 2905 reply(522, "Network protocol mismatch, " 2906 "use (%d)", pf); 2907 } else 2908 reply(501, "Network protocol mismatch."); /*XXX*/ 2909 2910 return; 2911 } 2912 } 2913 2914 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2915 if (pdata < 0) { 2916 perror_reply(425, "Can't open passive connection"); 2917 return; 2918 } 2919 on = 1; 2920 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2921 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2922 2923 seteuid(0); 2924 2925 pasv_addr = ctrl_addr; 2926 pasv_addr.su_port = 0; 2927 len = pasv_addr.su_len; 2928 2929 #ifdef IP_PORTRANGE 2930 if (ctrl_addr.su_family == AF_INET) { 2931 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2932 : IP_PORTRANGE_DEFAULT; 2933 2934 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2935 &on, sizeof(on)) < 0) 2936 goto pasv_error; 2937 } 2938 #endif 2939 #ifdef IPV6_PORTRANGE 2940 if (ctrl_addr.su_family == AF_INET6) { 2941 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2942 : IPV6_PORTRANGE_DEFAULT; 2943 2944 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2945 &on, sizeof(on)) < 0) 2946 goto pasv_error; 2947 } 2948 #endif 2949 2950 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2951 goto pasv_error; 2952 2953 seteuid(pw->pw_uid); 2954 2955 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2956 goto pasv_error; 2957 if (listen(pdata, 1) < 0) 2958 goto pasv_error; 2959 2960 #define UC(b) (((int) b) & 0xff) 2961 2962 if (strcmp(cmd, "LPSV") == 0) { 2963 p = (char *)&pasv_addr.su_port; 2964 switch (pasv_addr.su_family) { 2965 case AF_INET: 2966 a = (char *) &pasv_addr.su_sin.sin_addr; 2967 v4_reply: 2968 reply(228, 2969 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2970 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2971 2, UC(p[0]), UC(p[1])); 2972 return; 2973 case AF_INET6: 2974 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2975 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2976 goto v4_reply; 2977 } 2978 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2979 reply(228, 2980 "Entering Long Passive Mode " 2981 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2982 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2983 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2984 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2985 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2986 2, UC(p[0]), UC(p[1])); 2987 return; 2988 } 2989 } else if (strcmp(cmd, "EPSV") == 0) { 2990 switch (pasv_addr.su_family) { 2991 case AF_INET: 2992 case AF_INET6: 2993 reply(229, "Entering Extended Passive Mode (|||%d|)", 2994 ntohs(pasv_addr.su_port)); 2995 return; 2996 } 2997 } else { 2998 /* more proper error code? */ 2999 } 3000 3001 pasv_error: 3002 seteuid(pw->pw_uid); 3003 close(pdata); 3004 pdata = -1; 3005 perror_reply(425, "Can't open passive connection"); 3006 return; 3007 } 3008 3009 /* 3010 * Generate unique name for file with basename "local" 3011 * and open the file in order to avoid possible races. 3012 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3013 * Return descriptor to the file, set "name" to its name. 3014 * 3015 * Generates failure reply on error. 3016 */ 3017 static int 3018 guniquefd(char *local, char **name) 3019 { 3020 static char new[MAXPATHLEN]; 3021 struct stat st; 3022 char *cp; 3023 int count; 3024 int fd; 3025 3026 cp = strrchr(local, '/'); 3027 if (cp) 3028 *cp = '\0'; 3029 if (stat(cp ? local : ".", &st) < 0) { 3030 perror_reply(553, cp ? local : "."); 3031 return (-1); 3032 } 3033 if (cp) { 3034 /* 3035 * Let not overwrite dirname with counter suffix. 3036 * -4 is for /nn\0 3037 * In this extreme case dot won't be put in front of suffix. 3038 */ 3039 if (strlen(local) > sizeof(new) - 4) { 3040 reply(553, "Pathname too long."); 3041 return (-1); 3042 } 3043 *cp = '/'; 3044 } 3045 /* -4 is for the .nn<null> we put on the end below */ 3046 snprintf(new, sizeof(new) - 4, "%s", local); 3047 cp = new + strlen(new); 3048 /* 3049 * Don't generate dotfile unless requested explicitly. 3050 * This covers the case when basename gets truncated off 3051 * by buffer size. 3052 */ 3053 if (cp > new && cp[-1] != '/') 3054 *cp++ = '.'; 3055 for (count = 0; count < 100; count++) { 3056 /* At count 0 try unmodified name */ 3057 if (count) 3058 sprintf(cp, "%d", count); 3059 if ((fd = open(count ? new : local, 3060 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3061 *name = count ? new : local; 3062 return (fd); 3063 } 3064 if (errno != EEXIST) { 3065 perror_reply(553, count ? new : local); 3066 return (-1); 3067 } 3068 } 3069 reply(452, "Unique file name cannot be created."); 3070 return (-1); 3071 } 3072 3073 /* 3074 * Format and send reply containing system error number. 3075 */ 3076 void 3077 perror_reply(int code, char *string) 3078 { 3079 3080 reply(code, "%s: %s.", string, strerror(errno)); 3081 } 3082 3083 static char *onefile[] = { 3084 "", 3085 0 3086 }; 3087 3088 void 3089 send_file_list(char *whichf) 3090 { 3091 struct stat st; 3092 DIR *dirp = NULL; 3093 struct dirent *dir; 3094 FILE *dout = NULL; 3095 char **dirlist, *dirname; 3096 int simple = 0; 3097 int freeglob = 0; 3098 glob_t gl; 3099 3100 if (strpbrk(whichf, "~{[*?") != NULL) { 3101 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3102 3103 memset(&gl, 0, sizeof(gl)); 3104 gl.gl_matchc = MAXGLOBARGS; 3105 /*flags |= GLOB_LIMIT;*/ 3106 freeglob = 1; 3107 if (glob(whichf, flags, 0, &gl)) { 3108 reply(550, "No matching files found."); 3109 goto out; 3110 } else if (gl.gl_pathc == 0) { 3111 errno = ENOENT; 3112 perror_reply(550, whichf); 3113 goto out; 3114 } 3115 dirlist = gl.gl_pathv; 3116 } else { 3117 onefile[0] = whichf; 3118 dirlist = onefile; 3119 simple = 1; 3120 } 3121 3122 while ((dirname = *dirlist++)) { 3123 if (stat(dirname, &st) < 0) { 3124 /* 3125 * If user typed "ls -l", etc, and the client 3126 * used NLST, do what the user meant. 3127 */ 3128 if (dirname[0] == '-' && *dirlist == NULL && 3129 dout == NULL) 3130 retrieve(_PATH_LS " %s", dirname); 3131 else 3132 perror_reply(550, whichf); 3133 goto out; 3134 } 3135 3136 if (S_ISREG(st.st_mode)) { 3137 if (dout == NULL) { 3138 dout = dataconn("file list", -1, "w"); 3139 if (dout == NULL) 3140 goto out; 3141 STARTXFER; 3142 } 3143 START_UNSAFE; 3144 fprintf(dout, "%s%s\n", dirname, 3145 type == TYPE_A ? "\r" : ""); 3146 END_UNSAFE; 3147 if (ferror(dout)) 3148 goto data_err; 3149 byte_count += strlen(dirname) + 3150 (type == TYPE_A ? 2 : 1); 3151 CHECKOOB(goto abrt); 3152 continue; 3153 } else if (!S_ISDIR(st.st_mode)) 3154 continue; 3155 3156 if ((dirp = opendir(dirname)) == NULL) 3157 continue; 3158 3159 while ((dir = readdir(dirp)) != NULL) { 3160 char nbuf[MAXPATHLEN]; 3161 3162 CHECKOOB(goto abrt); 3163 3164 if (strcmp(dir->d_name, ".") == 0) 3165 continue; 3166 if (strcmp(dir->d_name, "..") == 0) 3167 continue; 3168 3169 snprintf(nbuf, sizeof(nbuf), 3170 "%s/%s", dirname, dir->d_name); 3171 3172 /* 3173 * We have to do a stat to insure it's 3174 * not a directory or special file. 3175 */ 3176 if (simple || (stat(nbuf, &st) == 0 && 3177 S_ISREG(st.st_mode))) { 3178 if (dout == NULL) { 3179 dout = dataconn("file list", -1, "w"); 3180 if (dout == NULL) 3181 goto out; 3182 STARTXFER; 3183 } 3184 START_UNSAFE; 3185 if (nbuf[0] == '.' && nbuf[1] == '/') 3186 fprintf(dout, "%s%s\n", &nbuf[2], 3187 type == TYPE_A ? "\r" : ""); 3188 else 3189 fprintf(dout, "%s%s\n", nbuf, 3190 type == TYPE_A ? "\r" : ""); 3191 END_UNSAFE; 3192 if (ferror(dout)) 3193 goto data_err; 3194 byte_count += strlen(nbuf) + 3195 (type == TYPE_A ? 2 : 1); 3196 CHECKOOB(goto abrt); 3197 } 3198 } 3199 closedir(dirp); 3200 dirp = NULL; 3201 } 3202 3203 if (dout == NULL) 3204 reply(550, "No files found."); 3205 else if (ferror(dout)) 3206 data_err: perror_reply(550, "Data connection"); 3207 else 3208 reply(226, "Transfer complete."); 3209 out: 3210 if (dout) { 3211 ENDXFER; 3212 abrt: 3213 fclose(dout); 3214 data = -1; 3215 pdata = -1; 3216 } 3217 if (dirp) 3218 closedir(dirp); 3219 if (freeglob) { 3220 freeglob = 0; 3221 globfree(&gl); 3222 } 3223 } 3224 3225 void 3226 reapchild(int signo) 3227 { 3228 while (waitpid(-1, NULL, WNOHANG) > 0); 3229 } 3230 3231 static void 3232 appendf(char **strp, char *fmt, ...) 3233 { 3234 va_list ap; 3235 char *ostr, *p; 3236 3237 va_start(ap, fmt); 3238 vasprintf(&p, fmt, ap); 3239 va_end(ap); 3240 if (p == NULL) 3241 fatalerror("Ran out of memory."); 3242 if (*strp == NULL) 3243 *strp = p; 3244 else { 3245 ostr = *strp; 3246 asprintf(strp, "%s%s", ostr, p); 3247 if (*strp == NULL) 3248 fatalerror("Ran out of memory."); 3249 free(ostr); 3250 } 3251 } 3252 3253 static void 3254 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3255 { 3256 char *msg = NULL; 3257 char wd[MAXPATHLEN + 1]; 3258 3259 if (logging <= 1) 3260 return; 3261 3262 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3263 strcpy(wd, strerror(errno)); 3264 3265 appendf(&msg, "%s", cmd); 3266 if (file1) 3267 appendf(&msg, " %s", file1); 3268 if (file2) 3269 appendf(&msg, " %s", file2); 3270 if (cnt >= 0) 3271 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3272 appendf(&msg, " (wd: %s", wd); 3273 if (guest || dochroot) 3274 appendf(&msg, "; chrooted"); 3275 appendf(&msg, ")"); 3276 syslog(LOG_INFO, "%s", msg); 3277 free(msg); 3278 } 3279 3280 static void 3281 logxfer(char *name, off_t size, time_t start) 3282 { 3283 char buf[MAXPATHLEN + 1024]; 3284 char path[MAXPATHLEN + 1]; 3285 time_t now; 3286 3287 if (statfd >= 0) { 3288 time(&now); 3289 if (realpath(name, path) == NULL) { 3290 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3291 return; 3292 } 3293 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3294 ctime(&now)+4, ident, remotehost, 3295 path, (intmax_t)size, 3296 (long)(now - start + (now == start))); 3297 write(statfd, buf, strlen(buf)); 3298 } 3299 } 3300 3301 static char * 3302 doublequote(char *s) 3303 { 3304 int n; 3305 char *p, *s2; 3306 3307 for (p = s, n = 0; *p; p++) 3308 if (*p == '"') 3309 n++; 3310 3311 if ((s2 = malloc(p - s + n + 1)) == NULL) 3312 return (NULL); 3313 3314 for (p = s2; *s; s++, p++) { 3315 if ((*p = *s) == '"') 3316 *(++p) = '"'; 3317 } 3318 *p = '\0'; 3319 3320 return (s2); 3321 } 3322 3323 /* setup server socket for specified address family */ 3324 /* if af is PF_UNSPEC more than one socket may be returned */ 3325 /* the returned list is dynamically allocated, so caller needs to free it */ 3326 static int * 3327 socksetup(int af, char *bindname, const char *bindport) 3328 { 3329 struct addrinfo hints, *res, *r; 3330 int error, maxs, *s, *socks; 3331 const int on = 1; 3332 3333 memset(&hints, 0, sizeof(hints)); 3334 hints.ai_flags = AI_PASSIVE; 3335 hints.ai_family = af; 3336 hints.ai_socktype = SOCK_STREAM; 3337 error = getaddrinfo(bindname, bindport, &hints, &res); 3338 if (error) { 3339 syslog(LOG_ERR, "%s", gai_strerror(error)); 3340 if (error == EAI_SYSTEM) 3341 syslog(LOG_ERR, "%s", strerror(errno)); 3342 return NULL; 3343 } 3344 3345 /* Count max number of sockets we may open */ 3346 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3347 ; 3348 socks = malloc((maxs + 1) * sizeof(int)); 3349 if (!socks) { 3350 freeaddrinfo(res); 3351 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3352 return NULL; 3353 } 3354 3355 *socks = 0; /* num of sockets counter at start of array */ 3356 s = socks + 1; 3357 for (r = res; r; r = r->ai_next) { 3358 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3359 if (*s < 0) { 3360 syslog(LOG_DEBUG, "control socket: %m"); 3361 continue; 3362 } 3363 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3364 &on, sizeof(on)) < 0) 3365 syslog(LOG_WARNING, 3366 "control setsockopt (SO_REUSEADDR): %m"); 3367 if (r->ai_family == AF_INET6) { 3368 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3369 &on, sizeof(on)) < 0) 3370 syslog(LOG_WARNING, 3371 "control setsockopt (IPV6_V6ONLY): %m"); 3372 } 3373 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3374 syslog(LOG_DEBUG, "control bind: %m"); 3375 close(*s); 3376 continue; 3377 } 3378 (*socks)++; 3379 s++; 3380 } 3381 3382 if (res) 3383 freeaddrinfo(res); 3384 3385 if (*socks == 0) { 3386 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3387 free(socks); 3388 return NULL; 3389 } 3390 return(socks); 3391 } 3392