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 #ifdef OPIE 65 #include <opie.h> 66 #endif 67 #include <signal.h> 68 #include <stdint.h> 69 #include <stdio.h> 70 #include <stdlib.h> 71 #include <string.h> 72 #include <syslog.h> 73 #include <time.h> 74 #include <unistd.h> 75 #include <libutil.h> 76 #ifdef LOGIN_CAP 77 #include <login_cap.h> 78 #endif 79 80 #ifdef USE_PAM 81 #include <security/pam_appl.h> 82 #endif 83 84 #include "pathnames.h" 85 #include "extern.h" 86 87 #include <stdarg.h> 88 89 static char version[] = "Version 6.00LS"; 90 #undef main 91 92 extern off_t restart_point; 93 extern char cbuf[]; 94 95 union sockunion ctrl_addr; 96 union sockunion data_source; 97 union sockunion data_dest; 98 union sockunion his_addr; 99 union sockunion pasv_addr; 100 101 int daemon_mode; 102 int data; 103 int dataport; 104 int hostinfo = 1; /* print host-specific info in messages */ 105 int logged_in; 106 struct passwd *pw; 107 char *homedir; 108 int ftpdebug; 109 int timeout = 900; /* timeout after 15 minutes of inactivity */ 110 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 111 int logging; 112 int restricted_data_ports = 1; 113 int paranoid = 1; /* be extra careful about security */ 114 int anon_only = 0; /* Only anonymous ftp allowed */ 115 int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 116 int guest; 117 int dochroot; 118 char *chrootdir; 119 int dowtmp = 1; 120 int stats; 121 int statfd = -1; 122 int type; 123 int form; 124 int stru; /* avoid C keyword */ 125 int mode; 126 int usedefault = 1; /* for data transfers */ 127 int pdata = -1; /* for passive mode */ 128 int readonly = 0; /* Server is in readonly mode. */ 129 int noepsv = 0; /* EPSV command is disabled. */ 130 int noretr = 0; /* RETR command is disabled. */ 131 int noguestretr = 0; /* RETR command is disabled for anon users. */ 132 int noguestmkd = 0; /* MKD command is disabled for anon users. */ 133 int noguestmod = 1; /* anon users may not modify existing files. */ 134 135 off_t file_size; 136 off_t byte_count; 137 #if !defined(CMASK) || CMASK == 0 138 #undef CMASK 139 #define CMASK 027 140 #endif 141 int defumask = CMASK; /* default umask value */ 142 char tmpline[7]; 143 char *hostname; 144 int epsvall = 0; 145 146 #ifdef VIRTUAL_HOSTING 147 char *ftpuser; 148 149 static struct ftphost { 150 struct ftphost *next; 151 struct addrinfo *hostinfo; 152 char *hostname; 153 char *anonuser; 154 char *statfile; 155 char *welcome; 156 char *loginmsg; 157 } *thishost, *firsthost; 158 159 #endif 160 char remotehost[NI_MAXHOST]; 161 char *ident = NULL; 162 163 static char ttyline[20]; 164 char *tty = ttyline; /* for klogin */ 165 166 #ifdef USE_PAM 167 static int auth_pam(struct passwd**, const char*); 168 pam_handle_t *pamh = NULL; 169 #endif 170 171 #ifdef OPIE 172 static struct opie opiedata; 173 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 174 #endif 175 static int pwok; 176 177 char *pid_file = NULL; /* means default location to pidfile(3) */ 178 179 /* 180 * Limit number of pathnames that glob can return. 181 * A limit of 0 indicates the number of pathnames is unlimited. 182 */ 183 #define MAXGLOBARGS 16384 184 185 /* 186 * Timeout intervals for retrying connections 187 * to hosts that don't accept PORT cmds. This 188 * is a kludge, but given the problems with TCP... 189 */ 190 #define SWAITMAX 90 /* wait at most 90 seconds */ 191 #define SWAITINT 5 /* interval between retries */ 192 193 int swaitmax = SWAITMAX; 194 int swaitint = SWAITINT; 195 196 #ifdef SETPROCTITLE 197 char proctitle[LINE_MAX]; /* initial part of title */ 198 #endif /* SETPROCTITLE */ 199 200 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 201 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 202 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 203 204 static volatile sig_atomic_t recvurg; 205 static int transflag; /* NB: for debugging only */ 206 207 #define STARTXFER flagxfer(1) 208 #define ENDXFER flagxfer(0) 209 210 #define START_UNSAFE maskurg(1) 211 #define END_UNSAFE maskurg(0) 212 213 /* It's OK to put an `else' clause after this macro. */ 214 #define CHECKOOB(action) \ 215 if (recvurg) { \ 216 recvurg = 0; \ 217 if (myoob()) { \ 218 ENDXFER; \ 219 action; \ 220 } \ 221 } 222 223 #ifdef VIRTUAL_HOSTING 224 static void inithosts(int); 225 static void selecthost(union sockunion *); 226 #endif 227 static void ack(char *); 228 static void sigurg(int); 229 static void maskurg(int); 230 static void flagxfer(int); 231 static int myoob(void); 232 static int checkuser(char *, char *, int, char **); 233 static FILE *dataconn(char *, off_t, char *); 234 static void dolog(struct sockaddr *); 235 static void end_login(void); 236 static FILE *getdatasock(char *); 237 static int guniquefd(char *, char **); 238 static void lostconn(int); 239 static void sigquit(int); 240 static int receive_data(FILE *, FILE *); 241 static int send_data(FILE *, FILE *, size_t, off_t, int); 242 static struct passwd * 243 sgetpwnam(char *); 244 static char *sgetsave(char *); 245 static void reapchild(int); 246 static void appendf(char **, char *, ...) __printflike(2, 3); 247 static void logcmd(char *, char *, char *, off_t); 248 static void logxfer(char *, off_t, time_t); 249 static char *doublequote(char *); 250 static int *socksetup(int, char *, const char *); 251 252 int 253 main(int argc, char *argv[]) 254 { 255 socklen_t addrlen; 256 int ch, on = 1, tos; 257 char *cp, line[LINE_MAX]; 258 FILE *fd; 259 char *bindname = NULL; 260 const char *bindport = "ftp"; 261 int family = AF_UNSPEC; 262 struct sigaction sa; 263 264 tzset(); /* in case no timezone database in ~ftp */ 265 sigemptyset(&sa.sa_mask); 266 sa.sa_flags = SA_RESTART; 267 268 /* 269 * Prevent diagnostic messages from appearing on stderr. 270 * We run as a daemon or from inetd; in both cases, there's 271 * more reason in logging to syslog. 272 */ 273 freopen(_PATH_DEVNULL, "w", stderr); 274 opterr = 0; 275 276 /* 277 * LOG_NDELAY sets up the logging connection immediately, 278 * necessary for anonymous ftp's that chroot and can't do it later. 279 */ 280 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 281 282 while ((ch = getopt(argc, argv, 283 "468a:AdDEH:hlmMoOp:P:rRSt:T:u:UvW")) != -1) { 284 switch (ch) { 285 case '4': 286 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 287 break; 288 289 case '6': 290 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 291 break; 292 293 case '8': 294 assumeutf8 = 1; 295 break; 296 297 case 'a': 298 bindname = optarg; 299 break; 300 301 case 'A': 302 anon_only = 1; 303 break; 304 305 case 'd': 306 ftpdebug++; 307 break; 308 309 case 'D': 310 daemon_mode++; 311 break; 312 313 case 'E': 314 noepsv = 1; 315 break; 316 317 case 'h': 318 hostinfo = 0; 319 break; 320 321 case 'H': 322 hostname = optarg; 323 break; 324 325 case 'l': 326 logging++; /* > 1 == extra logging */ 327 break; 328 329 case 'm': 330 noguestmod = 0; 331 break; 332 333 case 'M': 334 noguestmkd = 1; 335 break; 336 337 case 'o': 338 noretr = 1; 339 break; 340 341 case 'O': 342 noguestretr = 1; 343 break; 344 345 case 'p': 346 pid_file = optarg; 347 break; 348 349 case 'P': 350 bindport = optarg; 351 break; 352 353 case 'r': 354 readonly = 1; 355 break; 356 357 case 'R': 358 paranoid = 0; 359 break; 360 361 case 'S': 362 stats++; 363 break; 364 365 case 't': 366 timeout = atoi(optarg); 367 if (maxtimeout < timeout) 368 maxtimeout = timeout; 369 break; 370 371 case 'T': 372 maxtimeout = atoi(optarg); 373 if (timeout > maxtimeout) 374 timeout = maxtimeout; 375 break; 376 377 case 'u': 378 { 379 long val = 0; 380 381 val = strtol(optarg, &optarg, 8); 382 if (*optarg != '\0' || val < 0) 383 syslog(LOG_WARNING, "bad value for -u"); 384 else 385 defumask = val; 386 break; 387 } 388 case 'U': 389 restricted_data_ports = 0; 390 break; 391 392 case 'v': 393 ftpdebug++; 394 break; 395 396 case 'W': 397 dowtmp = 0; 398 break; 399 400 default: 401 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 402 break; 403 } 404 } 405 406 if (daemon_mode) { 407 int *ctl_sock, fd, maxfd = -1, nfds, i; 408 fd_set defreadfds, readfds; 409 pid_t pid; 410 struct pidfh *pfh; 411 412 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) { 413 if (errno == EEXIST) { 414 syslog(LOG_ERR, "%s already running, pid %d", 415 getprogname(), (int)pid); 416 exit(1); 417 } 418 syslog(LOG_WARNING, "pidfile_open: %m"); 419 } 420 421 /* 422 * Detach from parent. 423 */ 424 if (daemon(1, 1) < 0) { 425 syslog(LOG_ERR, "failed to become a daemon"); 426 exit(1); 427 } 428 429 if (pfh != NULL && pidfile_write(pfh) == -1) 430 syslog(LOG_WARNING, "pidfile_write: %m"); 431 432 sa.sa_handler = reapchild; 433 sigaction(SIGCHLD, &sa, NULL); 434 435 #ifdef VIRTUAL_HOSTING 436 inithosts(family); 437 #endif 438 439 /* 440 * Open a socket, bind it to the FTP port, and start 441 * listening. 442 */ 443 ctl_sock = socksetup(family, bindname, bindport); 444 if (ctl_sock == NULL) 445 exit(1); 446 447 FD_ZERO(&defreadfds); 448 for (i = 1; i <= *ctl_sock; i++) { 449 FD_SET(ctl_sock[i], &defreadfds); 450 if (listen(ctl_sock[i], 32) < 0) { 451 syslog(LOG_ERR, "control listen: %m"); 452 exit(1); 453 } 454 if (maxfd < ctl_sock[i]) 455 maxfd = ctl_sock[i]; 456 } 457 458 /* 459 * Loop forever accepting connection requests and forking off 460 * children to handle them. 461 */ 462 while (1) { 463 FD_COPY(&defreadfds, &readfds); 464 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 465 if (nfds <= 0) { 466 if (nfds < 0 && errno != EINTR) 467 syslog(LOG_WARNING, "select: %m"); 468 continue; 469 } 470 471 pid = -1; 472 for (i = 1; i <= *ctl_sock; i++) 473 if (FD_ISSET(ctl_sock[i], &readfds)) { 474 addrlen = sizeof(his_addr); 475 fd = accept(ctl_sock[i], 476 (struct sockaddr *)&his_addr, 477 &addrlen); 478 if (fd == -1) { 479 syslog(LOG_WARNING, 480 "accept: %m"); 481 continue; 482 } 483 switch (pid = fork()) { 484 case 0: 485 /* child */ 486 dup2(fd, 0); 487 dup2(fd, 1); 488 close(fd); 489 for (i = 1; i <= *ctl_sock; i++) 490 close(ctl_sock[i]); 491 if (pfh != NULL) 492 pidfile_close(pfh); 493 goto gotchild; 494 case -1: 495 syslog(LOG_WARNING, "fork: %m"); 496 /* FALLTHROUGH */ 497 default: 498 close(fd); 499 } 500 } 501 } 502 } else { 503 addrlen = sizeof(his_addr); 504 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 505 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 506 exit(1); 507 } 508 509 #ifdef VIRTUAL_HOSTING 510 if (his_addr.su_family == AF_INET6 && 511 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 512 family = AF_INET; 513 else 514 family = his_addr.su_family; 515 inithosts(family); 516 #endif 517 } 518 519 gotchild: 520 sa.sa_handler = SIG_DFL; 521 sigaction(SIGCHLD, &sa, NULL); 522 523 sa.sa_handler = sigurg; 524 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 525 sigaction(SIGURG, &sa, NULL); 526 527 sigfillset(&sa.sa_mask); /* block all signals in handler */ 528 sa.sa_flags = SA_RESTART; 529 sa.sa_handler = sigquit; 530 sigaction(SIGHUP, &sa, NULL); 531 sigaction(SIGINT, &sa, NULL); 532 sigaction(SIGQUIT, &sa, NULL); 533 sigaction(SIGTERM, &sa, NULL); 534 535 sa.sa_handler = lostconn; 536 sigaction(SIGPIPE, &sa, NULL); 537 538 addrlen = sizeof(ctrl_addr); 539 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 540 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 541 exit(1); 542 } 543 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 544 #ifdef VIRTUAL_HOSTING 545 /* select our identity from virtual host table */ 546 selecthost(&ctrl_addr); 547 #endif 548 #ifdef IP_TOS 549 if (ctrl_addr.su_family == AF_INET) 550 { 551 tos = IPTOS_LOWDELAY; 552 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 553 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 554 } 555 #endif 556 /* 557 * Disable Nagle on the control channel so that we don't have to wait 558 * for peer's ACK before issuing our next reply. 559 */ 560 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 561 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 562 563 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 564 565 /* set this here so klogin can use it... */ 566 snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 567 568 /* Try to handle urgent data inline */ 569 #ifdef SO_OOBINLINE 570 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 571 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 572 #endif 573 574 #ifdef F_SETOWN 575 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 576 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 577 #endif 578 dolog((struct sockaddr *)&his_addr); 579 /* 580 * Set up default state 581 */ 582 data = -1; 583 type = TYPE_A; 584 form = FORM_N; 585 stru = STRU_F; 586 mode = MODE_S; 587 tmpline[0] = '\0'; 588 589 /* If logins are disabled, print out the message. */ 590 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 591 while (fgets(line, sizeof(line), fd) != NULL) { 592 if ((cp = strchr(line, '\n')) != NULL) 593 *cp = '\0'; 594 lreply(530, "%s", line); 595 } 596 fflush(stdout); 597 fclose(fd); 598 reply(530, "System not available."); 599 exit(0); 600 } 601 #ifdef VIRTUAL_HOSTING 602 fd = fopen(thishost->welcome, "r"); 603 #else 604 fd = fopen(_PATH_FTPWELCOME, "r"); 605 #endif 606 if (fd != NULL) { 607 while (fgets(line, sizeof(line), fd) != NULL) { 608 if ((cp = strchr(line, '\n')) != NULL) 609 *cp = '\0'; 610 lreply(220, "%s", line); 611 } 612 fflush(stdout); 613 fclose(fd); 614 /* reply(220,) must follow */ 615 } 616 #ifndef VIRTUAL_HOSTING 617 if (hostname == NULL) { 618 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 619 fatalerror("Ran out of memory."); 620 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 621 hostname[0] = '\0'; 622 hostname[MAXHOSTNAMELEN - 1] = '\0'; 623 } 624 #endif 625 if (hostinfo) 626 reply(220, "%s FTP server (%s) ready.", hostname, version); 627 else 628 reply(220, "FTP server ready."); 629 for (;;) 630 yyparse(); 631 /* NOTREACHED */ 632 } 633 634 static void 635 lostconn(int signo) 636 { 637 638 if (ftpdebug) 639 syslog(LOG_DEBUG, "lost connection"); 640 dologout(1); 641 } 642 643 static void 644 sigquit(int signo) 645 { 646 647 syslog(LOG_ERR, "got signal %d", signo); 648 dologout(1); 649 } 650 651 #ifdef VIRTUAL_HOSTING 652 /* 653 * read in virtual host tables (if they exist) 654 */ 655 656 static void 657 inithosts(int family) 658 { 659 int insert; 660 size_t len; 661 FILE *fp; 662 char *cp, *mp, *line; 663 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 664 struct ftphost *hrp, *lhrp; 665 struct addrinfo hints, *res, *ai; 666 667 /* 668 * Fill in the default host information 669 */ 670 if (hostname == NULL) { 671 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 672 fatalerror("Ran out of memory."); 673 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 674 hostname[0] = '\0'; 675 hostname[MAXHOSTNAMELEN - 1] = '\0'; 676 } 677 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 678 fatalerror("Ran out of memory."); 679 hrp->hostname = hostname; 680 hrp->hostinfo = NULL; 681 682 memset(&hints, 0, sizeof(hints)); 683 hints.ai_flags = AI_PASSIVE; 684 hints.ai_family = family; 685 hints.ai_socktype = SOCK_STREAM; 686 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 687 hrp->hostinfo = res; 688 hrp->statfile = _PATH_FTPDSTATFILE; 689 hrp->welcome = _PATH_FTPWELCOME; 690 hrp->loginmsg = _PATH_FTPLOGINMESG; 691 hrp->anonuser = "ftp"; 692 hrp->next = NULL; 693 thishost = firsthost = lhrp = hrp; 694 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 695 int addrsize, gothost; 696 void *addr; 697 struct hostent *hp; 698 699 while ((line = fgetln(fp, &len)) != NULL) { 700 int i, hp_error; 701 702 /* skip comments */ 703 if (line[0] == '#') 704 continue; 705 if (line[len - 1] == '\n') { 706 line[len - 1] = '\0'; 707 mp = NULL; 708 } else { 709 if ((mp = malloc(len + 1)) == NULL) 710 fatalerror("Ran out of memory."); 711 memcpy(mp, line, len); 712 mp[len] = '\0'; 713 line = mp; 714 } 715 cp = strtok(line, " \t"); 716 /* skip empty lines */ 717 if (cp == NULL) 718 goto nextline; 719 vhost = cp; 720 721 /* set defaults */ 722 anonuser = "ftp"; 723 statfile = _PATH_FTPDSTATFILE; 724 welcome = _PATH_FTPWELCOME; 725 loginmsg = _PATH_FTPLOGINMESG; 726 727 /* 728 * Preparse the line so we can use its info 729 * for all the addresses associated with 730 * the virtual host name. 731 * Field 0, the virtual host name, is special: 732 * it's already parsed off and will be strdup'ed 733 * later, after we know its canonical form. 734 */ 735 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 736 if (*cp != '-' && (cp = strdup(cp))) 737 switch (i) { 738 case 1: /* anon user permissions */ 739 anonuser = cp; 740 break; 741 case 2: /* statistics file */ 742 statfile = cp; 743 break; 744 case 3: /* welcome message */ 745 welcome = cp; 746 break; 747 case 4: /* login message */ 748 loginmsg = cp; 749 break; 750 default: /* programming error */ 751 abort(); 752 /* NOTREACHED */ 753 } 754 755 hints.ai_flags = AI_PASSIVE; 756 hints.ai_family = family; 757 hints.ai_socktype = SOCK_STREAM; 758 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 759 goto nextline; 760 for (ai = res; ai != NULL && ai->ai_addr != NULL; 761 ai = ai->ai_next) { 762 763 gothost = 0; 764 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 765 struct addrinfo *hi; 766 767 for (hi = hrp->hostinfo; hi != NULL; 768 hi = hi->ai_next) 769 if (hi->ai_addrlen == ai->ai_addrlen && 770 memcmp(hi->ai_addr, 771 ai->ai_addr, 772 ai->ai_addr->sa_len) == 0) { 773 gothost++; 774 break; 775 } 776 if (gothost) 777 break; 778 } 779 if (hrp == NULL) { 780 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 781 goto nextline; 782 hrp->hostname = NULL; 783 insert = 1; 784 } else { 785 if (hrp->hostinfo && hrp->hostinfo != res) 786 freeaddrinfo(hrp->hostinfo); 787 insert = 0; /* host already in the chain */ 788 } 789 hrp->hostinfo = res; 790 791 /* 792 * determine hostname to use. 793 * force defined name if there is a valid alias 794 * otherwise fallback to primary hostname 795 */ 796 /* XXX: getaddrinfo() can't do alias check */ 797 switch(hrp->hostinfo->ai_family) { 798 case AF_INET: 799 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 800 addrsize = sizeof(struct in_addr); 801 break; 802 case AF_INET6: 803 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 804 addrsize = sizeof(struct in6_addr); 805 break; 806 default: 807 /* should not reach here */ 808 freeaddrinfo(hrp->hostinfo); 809 if (insert) 810 free(hrp); /*not in chain, can free*/ 811 else 812 hrp->hostinfo = NULL; /*mark as blank*/ 813 goto nextline; 814 /* NOTREACHED */ 815 } 816 if ((hp = getipnodebyaddr(addr, addrsize, 817 hrp->hostinfo->ai_family, 818 &hp_error)) != NULL) { 819 if (strcmp(vhost, hp->h_name) != 0) { 820 if (hp->h_aliases == NULL) 821 vhost = hp->h_name; 822 else { 823 i = 0; 824 while (hp->h_aliases[i] && 825 strcmp(vhost, hp->h_aliases[i]) != 0) 826 ++i; 827 if (hp->h_aliases[i] == NULL) 828 vhost = hp->h_name; 829 } 830 } 831 } 832 if (hrp->hostname && 833 strcmp(hrp->hostname, vhost) != 0) { 834 free(hrp->hostname); 835 hrp->hostname = NULL; 836 } 837 if (hrp->hostname == NULL && 838 (hrp->hostname = strdup(vhost)) == NULL) { 839 freeaddrinfo(hrp->hostinfo); 840 hrp->hostinfo = NULL; /* mark as blank */ 841 if (hp) 842 freehostent(hp); 843 goto nextline; 844 } 845 hrp->anonuser = anonuser; 846 hrp->statfile = statfile; 847 hrp->welcome = welcome; 848 hrp->loginmsg = loginmsg; 849 if (insert) { 850 hrp->next = NULL; 851 lhrp->next = hrp; 852 lhrp = hrp; 853 } 854 if (hp) 855 freehostent(hp); 856 } 857 nextline: 858 if (mp) 859 free(mp); 860 } 861 fclose(fp); 862 } 863 } 864 865 static void 866 selecthost(union sockunion *su) 867 { 868 struct ftphost *hrp; 869 u_int16_t port; 870 #ifdef INET6 871 struct in6_addr *mapped_in6 = NULL; 872 #endif 873 struct addrinfo *hi; 874 875 #ifdef INET6 876 /* 877 * XXX IPv4 mapped IPv6 addr consideraton, 878 * specified in rfc2373. 879 */ 880 if (su->su_family == AF_INET6 && 881 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 882 mapped_in6 = &su->su_sin6.sin6_addr; 883 #endif 884 885 hrp = thishost = firsthost; /* default */ 886 port = su->su_port; 887 su->su_port = 0; 888 while (hrp != NULL) { 889 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 890 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 891 thishost = hrp; 892 goto found; 893 } 894 #ifdef INET6 895 /* XXX IPv4 mapped IPv6 addr consideraton */ 896 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 897 (memcmp(&mapped_in6->s6_addr[12], 898 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 899 sizeof(struct in_addr)) == 0)) { 900 thishost = hrp; 901 goto found; 902 } 903 #endif 904 } 905 hrp = hrp->next; 906 } 907 found: 908 su->su_port = port; 909 /* setup static variables as appropriate */ 910 hostname = thishost->hostname; 911 ftpuser = thishost->anonuser; 912 } 913 #endif 914 915 /* 916 * Helper function for sgetpwnam(). 917 */ 918 static char * 919 sgetsave(char *s) 920 { 921 char *new = malloc(strlen(s) + 1); 922 923 if (new == NULL) { 924 reply(421, "Ran out of memory."); 925 dologout(1); 926 /* NOTREACHED */ 927 } 928 strcpy(new, s); 929 return (new); 930 } 931 932 /* 933 * Save the result of a getpwnam. Used for USER command, since 934 * the data returned must not be clobbered by any other command 935 * (e.g., globbing). 936 * NB: The data returned by sgetpwnam() will remain valid until 937 * the next call to this function. Its difference from getpwnam() 938 * is that sgetpwnam() is known to be called from ftpd code only. 939 */ 940 static struct passwd * 941 sgetpwnam(char *name) 942 { 943 static struct passwd save; 944 struct passwd *p; 945 946 if ((p = getpwnam(name)) == NULL) 947 return (p); 948 if (save.pw_name) { 949 free(save.pw_name); 950 free(save.pw_passwd); 951 free(save.pw_gecos); 952 free(save.pw_dir); 953 free(save.pw_shell); 954 } 955 save = *p; 956 save.pw_name = sgetsave(p->pw_name); 957 save.pw_passwd = sgetsave(p->pw_passwd); 958 save.pw_gecos = sgetsave(p->pw_gecos); 959 save.pw_dir = sgetsave(p->pw_dir); 960 save.pw_shell = sgetsave(p->pw_shell); 961 return (&save); 962 } 963 964 static int login_attempts; /* number of failed login attempts */ 965 static int askpasswd; /* had user command, ask for passwd */ 966 static char curname[MAXLOGNAME]; /* current USER name */ 967 968 /* 969 * USER command. 970 * Sets global passwd pointer pw if named account exists and is acceptable; 971 * sets askpasswd if a PASS command is expected. If logged in previously, 972 * need to reset state. If name is "ftp" or "anonymous", the name is not in 973 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 974 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 975 * requesting login privileges. Disallow anyone who does not have a standard 976 * shell as returned by getusershell(). Disallow anyone mentioned in the file 977 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 978 */ 979 void 980 user(char *name) 981 { 982 char *cp, *shell; 983 984 if (logged_in) { 985 if (guest) { 986 reply(530, "Can't change user from guest login."); 987 return; 988 } else if (dochroot) { 989 reply(530, "Can't change user from chroot user."); 990 return; 991 } 992 end_login(); 993 } 994 995 guest = 0; 996 #ifdef VIRTUAL_HOSTING 997 pw = sgetpwnam(thishost->anonuser); 998 #else 999 pw = sgetpwnam("ftp"); 1000 #endif 1001 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1002 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 1003 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 1004 reply(530, "User %s access denied.", name); 1005 else if (pw != NULL) { 1006 guest = 1; 1007 askpasswd = 1; 1008 reply(331, 1009 "Guest login ok, send your email address as password."); 1010 } else 1011 reply(530, "User %s unknown.", name); 1012 if (!askpasswd && logging) 1013 syslog(LOG_NOTICE, 1014 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1015 return; 1016 } 1017 if (anon_only != 0) { 1018 reply(530, "Sorry, only anonymous ftp allowed."); 1019 return; 1020 } 1021 1022 if ((pw = sgetpwnam(name))) { 1023 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1024 shell = _PATH_BSHELL; 1025 setusershell(); 1026 while ((cp = getusershell()) != NULL) 1027 if (strcmp(cp, shell) == 0) 1028 break; 1029 endusershell(); 1030 1031 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1032 reply(530, "User %s access denied.", name); 1033 if (logging) 1034 syslog(LOG_NOTICE, 1035 "FTP LOGIN REFUSED FROM %s, %s", 1036 remotehost, name); 1037 pw = NULL; 1038 return; 1039 } 1040 } 1041 if (logging) 1042 strncpy(curname, name, sizeof(curname)-1); 1043 1044 pwok = 0; 1045 #ifdef OPIE 1046 #ifdef USE_PAM 1047 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1048 #endif 1049 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1050 pwok = (pw != NULL) && 1051 opieaccessfile(remotehost) && 1052 opiealways(pw->pw_dir); 1053 reply(331, "Response to %s %s for %s.", 1054 opieprompt, pwok ? "requested" : "required", name); 1055 } else { 1056 pwok = 1; 1057 reply(331, "Password required for %s.", name); 1058 } 1059 #else 1060 pwok = 1; 1061 reply(331, "Password required for %s.", name); 1062 #endif 1063 askpasswd = 1; 1064 /* 1065 * Delay before reading passwd after first failed 1066 * attempt to slow down passwd-guessing programs. 1067 */ 1068 if (login_attempts) 1069 sleep(login_attempts); 1070 } 1071 1072 /* 1073 * Check if a user is in the file "fname", 1074 * return a pointer to a malloc'd string with the rest 1075 * of the matching line in "residue" if not NULL. 1076 */ 1077 static int 1078 checkuser(char *fname, char *name, int pwset, char **residue) 1079 { 1080 FILE *fd; 1081 int found = 0; 1082 size_t len; 1083 char *line, *mp, *p; 1084 1085 if ((fd = fopen(fname, "r")) != NULL) { 1086 while (!found && (line = fgetln(fd, &len)) != NULL) { 1087 /* skip comments */ 1088 if (line[0] == '#') 1089 continue; 1090 if (line[len - 1] == '\n') { 1091 line[len - 1] = '\0'; 1092 mp = NULL; 1093 } else { 1094 if ((mp = malloc(len + 1)) == NULL) 1095 fatalerror("Ran out of memory."); 1096 memcpy(mp, line, len); 1097 mp[len] = '\0'; 1098 line = mp; 1099 } 1100 /* avoid possible leading and trailing whitespace */ 1101 p = strtok(line, " \t"); 1102 /* skip empty lines */ 1103 if (p == NULL) 1104 goto nextline; 1105 /* 1106 * if first chr is '@', check group membership 1107 */ 1108 if (p[0] == '@') { 1109 int i = 0; 1110 struct group *grp; 1111 1112 if (p[1] == '\0') /* single @ matches anyone */ 1113 found = 1; 1114 else { 1115 if ((grp = getgrnam(p+1)) == NULL) 1116 goto nextline; 1117 /* 1118 * Check user's default group 1119 */ 1120 if (pwset && grp->gr_gid == pw->pw_gid) 1121 found = 1; 1122 /* 1123 * Check supplementary groups 1124 */ 1125 while (!found && grp->gr_mem[i]) 1126 found = strcmp(name, 1127 grp->gr_mem[i++]) 1128 == 0; 1129 } 1130 } 1131 /* 1132 * Otherwise, just check for username match 1133 */ 1134 else 1135 found = strcmp(p, name) == 0; 1136 /* 1137 * Save the rest of line to "residue" if matched 1138 */ 1139 if (found && residue) { 1140 if ((p = strtok(NULL, "")) != NULL) 1141 p += strspn(p, " \t"); 1142 if (p && *p) { 1143 if ((*residue = strdup(p)) == NULL) 1144 fatalerror("Ran out of memory."); 1145 } else 1146 *residue = NULL; 1147 } 1148 nextline: 1149 if (mp) 1150 free(mp); 1151 } 1152 fclose(fd); 1153 } 1154 return (found); 1155 } 1156 1157 /* 1158 * Terminate login as previous user, if any, resetting state; 1159 * used when USER command is given or login fails. 1160 */ 1161 static void 1162 end_login(void) 1163 { 1164 #ifdef USE_PAM 1165 int e; 1166 #endif 1167 1168 seteuid(0); 1169 if (logged_in && dowtmp) 1170 ftpd_logwtmp(ttyline, "", NULL); 1171 pw = NULL; 1172 #ifdef LOGIN_CAP 1173 /* XXX Missing LOGIN_SETMAC */ 1174 setusercontext(NULL, getpwuid(0), 0, 1175 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1176 #endif 1177 #ifdef USE_PAM 1178 if (pamh) { 1179 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1180 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1181 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1182 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1183 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1184 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1185 pamh = NULL; 1186 } 1187 #endif 1188 logged_in = 0; 1189 guest = 0; 1190 dochroot = 0; 1191 } 1192 1193 #ifdef USE_PAM 1194 1195 /* 1196 * the following code is stolen from imap-uw PAM authentication module and 1197 * login.c 1198 */ 1199 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1200 1201 struct cred_t { 1202 const char *uname; /* user name */ 1203 const char *pass; /* password */ 1204 }; 1205 typedef struct cred_t cred_t; 1206 1207 static int 1208 auth_conv(int num_msg, const struct pam_message **msg, 1209 struct pam_response **resp, void *appdata) 1210 { 1211 int i; 1212 cred_t *cred = (cred_t *) appdata; 1213 struct pam_response *reply; 1214 1215 reply = calloc(num_msg, sizeof *reply); 1216 if (reply == NULL) 1217 return PAM_BUF_ERR; 1218 1219 for (i = 0; i < num_msg; i++) { 1220 switch (msg[i]->msg_style) { 1221 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1222 reply[i].resp_retcode = PAM_SUCCESS; 1223 reply[i].resp = COPY_STRING(cred->uname); 1224 /* PAM frees resp. */ 1225 break; 1226 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1227 reply[i].resp_retcode = PAM_SUCCESS; 1228 reply[i].resp = COPY_STRING(cred->pass); 1229 /* PAM frees resp. */ 1230 break; 1231 case PAM_TEXT_INFO: 1232 case PAM_ERROR_MSG: 1233 reply[i].resp_retcode = PAM_SUCCESS; 1234 reply[i].resp = NULL; 1235 break; 1236 default: /* unknown message style */ 1237 free(reply); 1238 return PAM_CONV_ERR; 1239 } 1240 } 1241 1242 *resp = reply; 1243 return PAM_SUCCESS; 1244 } 1245 1246 /* 1247 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1248 * authenticated, or 1 if not authenticated. If some sort of PAM system 1249 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1250 * function returns -1. This can be used as an indication that we should 1251 * fall back to a different authentication mechanism. 1252 */ 1253 static int 1254 auth_pam(struct passwd **ppw, const char *pass) 1255 { 1256 const char *tmpl_user; 1257 const void *item; 1258 int rval; 1259 int e; 1260 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1261 struct pam_conv conv = { &auth_conv, &auth_cred }; 1262 1263 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1264 if (e != PAM_SUCCESS) { 1265 /* 1266 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1267 * if context creation has failed in the first place. 1268 */ 1269 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1270 return -1; 1271 } 1272 1273 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1274 if (e != PAM_SUCCESS) { 1275 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1276 pam_strerror(pamh, e)); 1277 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1278 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1279 } 1280 pamh = NULL; 1281 return -1; 1282 } 1283 1284 e = pam_authenticate(pamh, 0); 1285 switch (e) { 1286 case PAM_SUCCESS: 1287 /* 1288 * With PAM we support the concept of a "template" 1289 * user. The user enters a login name which is 1290 * authenticated by PAM, usually via a remote service 1291 * such as RADIUS or TACACS+. If authentication 1292 * succeeds, a different but related "template" name 1293 * is used for setting the credentials, shell, and 1294 * home directory. The name the user enters need only 1295 * exist on the remote authentication server, but the 1296 * template name must be present in the local password 1297 * database. 1298 * 1299 * This is supported by two various mechanisms in the 1300 * individual modules. However, from the application's 1301 * point of view, the template user is always passed 1302 * back as a changed value of the PAM_USER item. 1303 */ 1304 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1305 PAM_SUCCESS) { 1306 tmpl_user = (const char *) item; 1307 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1308 *ppw = getpwnam(tmpl_user); 1309 } else 1310 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1311 pam_strerror(pamh, e)); 1312 rval = 0; 1313 break; 1314 1315 case PAM_AUTH_ERR: 1316 case PAM_USER_UNKNOWN: 1317 case PAM_MAXTRIES: 1318 rval = 1; 1319 break; 1320 1321 default: 1322 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1323 rval = -1; 1324 break; 1325 } 1326 1327 if (rval == 0) { 1328 e = pam_acct_mgmt(pamh, 0); 1329 if (e != PAM_SUCCESS) { 1330 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1331 pam_strerror(pamh, e)); 1332 rval = 1; 1333 } 1334 } 1335 1336 if (rval != 0) { 1337 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1338 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1339 } 1340 pamh = NULL; 1341 } 1342 return rval; 1343 } 1344 1345 #endif /* USE_PAM */ 1346 1347 void 1348 pass(char *passwd) 1349 { 1350 int rval; 1351 FILE *fd; 1352 #ifdef LOGIN_CAP 1353 login_cap_t *lc = NULL; 1354 #endif 1355 #ifdef USE_PAM 1356 int e; 1357 #endif 1358 char *residue = NULL; 1359 char *xpasswd; 1360 1361 if (logged_in || askpasswd == 0) { 1362 reply(503, "Login with USER first."); 1363 return; 1364 } 1365 askpasswd = 0; 1366 if (!guest) { /* "ftp" is only account allowed no password */ 1367 if (pw == NULL) { 1368 rval = 1; /* failure below */ 1369 goto skip; 1370 } 1371 #ifdef USE_PAM 1372 rval = auth_pam(&pw, passwd); 1373 if (rval >= 0) { 1374 #ifdef OPIE 1375 opieunlock(); 1376 #endif 1377 goto skip; 1378 } 1379 #endif 1380 #ifdef OPIE 1381 if (opieverify(&opiedata, passwd) == 0) 1382 xpasswd = pw->pw_passwd; 1383 else 1384 #endif 1385 if (pwok) { 1386 xpasswd = crypt(passwd, pw->pw_passwd); 1387 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1388 xpasswd = ":"; 1389 } else { 1390 rval = 1; 1391 goto skip; 1392 } 1393 rval = strcmp(pw->pw_passwd, xpasswd); 1394 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1395 rval = 1; /* failure */ 1396 skip: 1397 /* 1398 * If rval == 1, the user failed the authentication check 1399 * above. If rval == 0, either PAM or local authentication 1400 * succeeded. 1401 */ 1402 if (rval) { 1403 reply(530, "Login incorrect."); 1404 if (logging) { 1405 syslog(LOG_NOTICE, 1406 "FTP LOGIN FAILED FROM %s", 1407 remotehost); 1408 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1409 "FTP LOGIN FAILED FROM %s, %s", 1410 remotehost, curname); 1411 } 1412 pw = NULL; 1413 if (login_attempts++ >= 5) { 1414 syslog(LOG_NOTICE, 1415 "repeated login failures from %s", 1416 remotehost); 1417 exit(0); 1418 } 1419 return; 1420 } 1421 } 1422 login_attempts = 0; /* this time successful */ 1423 if (setegid(pw->pw_gid) < 0) { 1424 reply(550, "Can't set gid."); 1425 return; 1426 } 1427 /* May be overridden by login.conf */ 1428 umask(defumask); 1429 #ifdef LOGIN_CAP 1430 if ((lc = login_getpwclass(pw)) != NULL) { 1431 char remote_ip[NI_MAXHOST]; 1432 1433 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1434 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1435 NI_NUMERICHOST)) 1436 *remote_ip = 0; 1437 remote_ip[sizeof(remote_ip) - 1] = 0; 1438 if (!auth_hostok(lc, remotehost, remote_ip)) { 1439 syslog(LOG_INFO|LOG_AUTH, 1440 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1441 pw->pw_name); 1442 reply(530, "Permission denied."); 1443 pw = NULL; 1444 return; 1445 } 1446 if (!auth_timeok(lc, time(NULL))) { 1447 reply(530, "Login not available right now."); 1448 pw = NULL; 1449 return; 1450 } 1451 } 1452 /* XXX Missing LOGIN_SETMAC */ 1453 setusercontext(lc, pw, 0, 1454 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1455 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1456 #else 1457 setlogin(pw->pw_name); 1458 initgroups(pw->pw_name, pw->pw_gid); 1459 #endif 1460 1461 #ifdef USE_PAM 1462 if (pamh) { 1463 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1464 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1465 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1466 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1467 } 1468 } 1469 #endif 1470 1471 /* open wtmp before chroot */ 1472 if (dowtmp) 1473 ftpd_logwtmp(ttyline, pw->pw_name, 1474 (struct sockaddr *)&his_addr); 1475 logged_in = 1; 1476 1477 if (guest && stats && statfd < 0) 1478 #ifdef VIRTUAL_HOSTING 1479 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1480 #else 1481 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1482 #endif 1483 if (statfd < 0) 1484 stats = 0; 1485 1486 dochroot = 1487 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1488 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1489 || login_getcapbool(lc, "ftp-chroot", 0) 1490 #endif 1491 ; 1492 chrootdir = NULL; 1493 /* 1494 * For a chrooted local user, 1495 * a) see whether ftpchroot(5) specifies a chroot directory, 1496 * b) extract the directory pathname from the line, 1497 * c) expand it to the absolute pathname if necessary. 1498 */ 1499 if (dochroot && residue && 1500 (chrootdir = strtok(residue, " \t")) != NULL) { 1501 if (chrootdir[0] != '/') 1502 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1503 else 1504 chrootdir = strdup(chrootdir); /* make it permanent */ 1505 if (chrootdir == NULL) 1506 fatalerror("Ran out of memory."); 1507 } 1508 if (guest || dochroot) { 1509 /* 1510 * If no chroot directory set yet, use the login directory. 1511 * Copy it so it can be modified while pw->pw_dir stays intact. 1512 */ 1513 if (chrootdir == NULL && 1514 (chrootdir = strdup(pw->pw_dir)) == NULL) 1515 fatalerror("Ran out of memory."); 1516 /* 1517 * Check for the "/chroot/./home" syntax, 1518 * separate the chroot and home directory pathnames. 1519 */ 1520 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1521 *(homedir++) = '\0'; /* wipe '/' */ 1522 homedir++; /* skip '.' */ 1523 } else { 1524 /* 1525 * We MUST do a chdir() after the chroot. Otherwise 1526 * the old current directory will be accessible as "." 1527 * outside the new root! 1528 */ 1529 homedir = "/"; 1530 } 1531 /* 1532 * Finally, do chroot() 1533 */ 1534 if (chroot(chrootdir) < 0) { 1535 reply(550, "Can't change root."); 1536 goto bad; 1537 } 1538 } else /* real user w/o chroot */ 1539 homedir = pw->pw_dir; 1540 /* 1541 * Set euid *before* doing chdir() so 1542 * a) the user won't be carried to a directory that he couldn't reach 1543 * on his own due to no permission to upper path components, 1544 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1545 * (uid 0 has no root power over NFS if not mapped explicitly.) 1546 */ 1547 if (seteuid(pw->pw_uid) < 0) { 1548 reply(550, "Can't set uid."); 1549 goto bad; 1550 } 1551 if (chdir(homedir) < 0) { 1552 if (guest || dochroot) { 1553 reply(550, "Can't change to base directory."); 1554 goto bad; 1555 } else { 1556 if (chdir("/") < 0) { 1557 reply(550, "Root is inaccessible."); 1558 goto bad; 1559 } 1560 lreply(230, "No directory! Logging in with home=/."); 1561 } 1562 } 1563 1564 /* 1565 * Display a login message, if it exists. 1566 * N.B. reply(230,) must follow the message. 1567 */ 1568 #ifdef VIRTUAL_HOSTING 1569 fd = fopen(thishost->loginmsg, "r"); 1570 #else 1571 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1572 #endif 1573 if (fd != NULL) { 1574 char *cp, line[LINE_MAX]; 1575 1576 while (fgets(line, sizeof(line), fd) != NULL) { 1577 if ((cp = strchr(line, '\n')) != NULL) 1578 *cp = '\0'; 1579 lreply(230, "%s", line); 1580 } 1581 fflush(stdout); 1582 fclose(fd); 1583 } 1584 if (guest) { 1585 if (ident != NULL) 1586 free(ident); 1587 ident = strdup(passwd); 1588 if (ident == NULL) 1589 fatalerror("Ran out of memory."); 1590 1591 reply(230, "Guest login ok, access restrictions apply."); 1592 #ifdef SETPROCTITLE 1593 #ifdef VIRTUAL_HOSTING 1594 if (thishost != firsthost) 1595 snprintf(proctitle, sizeof(proctitle), 1596 "%s: anonymous(%s)/%s", remotehost, hostname, 1597 passwd); 1598 else 1599 #endif 1600 snprintf(proctitle, sizeof(proctitle), 1601 "%s: anonymous/%s", remotehost, passwd); 1602 setproctitle("%s", proctitle); 1603 #endif /* SETPROCTITLE */ 1604 if (logging) 1605 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1606 remotehost, passwd); 1607 } else { 1608 if (dochroot) 1609 reply(230, "User %s logged in, " 1610 "access restrictions apply.", pw->pw_name); 1611 else 1612 reply(230, "User %s logged in.", pw->pw_name); 1613 1614 #ifdef SETPROCTITLE 1615 snprintf(proctitle, sizeof(proctitle), 1616 "%s: user/%s", remotehost, pw->pw_name); 1617 setproctitle("%s", proctitle); 1618 #endif /* SETPROCTITLE */ 1619 if (logging) 1620 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1621 remotehost, pw->pw_name); 1622 } 1623 if (logging && (guest || dochroot)) 1624 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1625 #ifdef LOGIN_CAP 1626 login_close(lc); 1627 #endif 1628 if (residue) 1629 free(residue); 1630 return; 1631 bad: 1632 /* Forget all about it... */ 1633 #ifdef LOGIN_CAP 1634 login_close(lc); 1635 #endif 1636 if (residue) 1637 free(residue); 1638 end_login(); 1639 } 1640 1641 void 1642 retrieve(char *cmd, char *name) 1643 { 1644 FILE *fin, *dout; 1645 struct stat st; 1646 int (*closefunc)(FILE *); 1647 time_t start; 1648 1649 if (cmd == NULL) { 1650 fin = fopen(name, "r"), closefunc = fclose; 1651 st.st_size = 0; 1652 } else { 1653 char line[BUFSIZ]; 1654 1655 snprintf(line, sizeof(line), cmd, name), name = line; 1656 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1657 st.st_size = -1; 1658 st.st_blksize = BUFSIZ; 1659 } 1660 if (fin == NULL) { 1661 if (errno != 0) { 1662 perror_reply(550, name); 1663 if (cmd == NULL) { 1664 LOGCMD("get", name); 1665 } 1666 } 1667 return; 1668 } 1669 byte_count = -1; 1670 if (cmd == NULL) { 1671 if (fstat(fileno(fin), &st) < 0) { 1672 perror_reply(550, name); 1673 goto done; 1674 } 1675 if (!S_ISREG(st.st_mode)) { 1676 /* 1677 * Never sending a raw directory is a workaround 1678 * for buggy clients that will attempt to RETR 1679 * a directory before listing it, e.g., Mozilla. 1680 * Preventing a guest from getting irregular files 1681 * is a simple security measure. 1682 */ 1683 if (S_ISDIR(st.st_mode) || guest) { 1684 reply(550, "%s: not a plain file.", name); 1685 goto done; 1686 } 1687 st.st_size = -1; 1688 /* st.st_blksize is set for all descriptor types */ 1689 } 1690 } 1691 if (restart_point) { 1692 if (type == TYPE_A) { 1693 off_t i, n; 1694 int c; 1695 1696 n = restart_point; 1697 i = 0; 1698 while (i++ < n) { 1699 if ((c=getc(fin)) == EOF) { 1700 perror_reply(550, name); 1701 goto done; 1702 } 1703 if (c == '\n') 1704 i++; 1705 } 1706 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1707 perror_reply(550, name); 1708 goto done; 1709 } 1710 } 1711 dout = dataconn(name, st.st_size, "w"); 1712 if (dout == NULL) 1713 goto done; 1714 time(&start); 1715 send_data(fin, dout, st.st_blksize, st.st_size, 1716 restart_point == 0 && cmd == NULL && S_ISREG(st.st_mode)); 1717 if (cmd == NULL && guest && stats && byte_count > 0) 1718 logxfer(name, byte_count, start); 1719 fclose(dout); 1720 data = -1; 1721 pdata = -1; 1722 done: 1723 if (cmd == NULL) 1724 LOGBYTES("get", name, byte_count); 1725 (*closefunc)(fin); 1726 } 1727 1728 void 1729 store(char *name, char *mode, int unique) 1730 { 1731 int fd; 1732 FILE *fout, *din; 1733 int (*closefunc)(FILE *); 1734 1735 if (*mode == 'a') { /* APPE */ 1736 if (unique) { 1737 /* Programming error */ 1738 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1739 unique = 0; 1740 } 1741 if (guest && noguestmod) { 1742 reply(550, "Appending to existing file denied."); 1743 goto err; 1744 } 1745 restart_point = 0; /* not affected by preceding REST */ 1746 } 1747 if (unique) /* STOU overrides REST */ 1748 restart_point = 0; 1749 if (guest && noguestmod) { 1750 if (restart_point) { /* guest STOR w/REST */ 1751 reply(550, "Modifying existing file denied."); 1752 goto err; 1753 } else /* treat guest STOR as STOU */ 1754 unique = 1; 1755 } 1756 1757 if (restart_point) 1758 mode = "r+"; /* so ASCII manual seek can work */ 1759 if (unique) { 1760 if ((fd = guniquefd(name, &name)) < 0) 1761 goto err; 1762 fout = fdopen(fd, mode); 1763 } else 1764 fout = fopen(name, mode); 1765 closefunc = fclose; 1766 if (fout == NULL) { 1767 perror_reply(553, name); 1768 goto err; 1769 } 1770 byte_count = -1; 1771 if (restart_point) { 1772 if (type == TYPE_A) { 1773 off_t i, n; 1774 int c; 1775 1776 n = restart_point; 1777 i = 0; 1778 while (i++ < n) { 1779 if ((c=getc(fout)) == EOF) { 1780 perror_reply(550, name); 1781 goto done; 1782 } 1783 if (c == '\n') 1784 i++; 1785 } 1786 /* 1787 * We must do this seek to "current" position 1788 * because we are changing from reading to 1789 * writing. 1790 */ 1791 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1792 perror_reply(550, name); 1793 goto done; 1794 } 1795 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1796 perror_reply(550, name); 1797 goto done; 1798 } 1799 } 1800 din = dataconn(name, -1, "r"); 1801 if (din == NULL) 1802 goto done; 1803 if (receive_data(din, fout) == 0) { 1804 if (unique) 1805 reply(226, "Transfer complete (unique file name:%s).", 1806 name); 1807 else 1808 reply(226, "Transfer complete."); 1809 } 1810 fclose(din); 1811 data = -1; 1812 pdata = -1; 1813 done: 1814 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1815 (*closefunc)(fout); 1816 return; 1817 err: 1818 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1819 return; 1820 } 1821 1822 static FILE * 1823 getdatasock(char *mode) 1824 { 1825 int on = 1, s, t, tries; 1826 1827 if (data >= 0) 1828 return (fdopen(data, mode)); 1829 1830 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1831 if (s < 0) 1832 goto bad; 1833 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1834 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1835 /* anchor socket to avoid multi-homing problems */ 1836 data_source = ctrl_addr; 1837 data_source.su_port = htons(dataport); 1838 seteuid(0); 1839 for (tries = 1; ; tries++) { 1840 /* 1841 * We should loop here since it's possible that 1842 * another ftpd instance has passed this point and is 1843 * trying to open a data connection in active mode now. 1844 * Until the other connection is opened, we'll be getting 1845 * EADDRINUSE because no SOCK_STREAM sockets in the system 1846 * can share both local and remote addresses, localIP:20 1847 * and *:* in this case. 1848 */ 1849 if (bind(s, (struct sockaddr *)&data_source, 1850 data_source.su_len) >= 0) 1851 break; 1852 if (errno != EADDRINUSE || tries > 10) 1853 goto bad; 1854 sleep(tries); 1855 } 1856 seteuid(pw->pw_uid); 1857 #ifdef IP_TOS 1858 if (data_source.su_family == AF_INET) 1859 { 1860 on = IPTOS_THROUGHPUT; 1861 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1862 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1863 } 1864 #endif 1865 #ifdef TCP_NOPUSH 1866 /* 1867 * Turn off push flag to keep sender TCP from sending short packets 1868 * at the boundaries of each write(). 1869 */ 1870 on = 1; 1871 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1872 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1873 #endif 1874 return (fdopen(s, mode)); 1875 bad: 1876 /* Return the real value of errno (close may change it) */ 1877 t = errno; 1878 seteuid(pw->pw_uid); 1879 close(s); 1880 errno = t; 1881 return (NULL); 1882 } 1883 1884 static FILE * 1885 dataconn(char *name, off_t size, char *mode) 1886 { 1887 char sizebuf[32]; 1888 FILE *file; 1889 int retry = 0, tos, conerrno; 1890 1891 file_size = size; 1892 byte_count = 0; 1893 if (size != -1) 1894 snprintf(sizebuf, sizeof(sizebuf), 1895 " (%jd bytes)", (intmax_t)size); 1896 else 1897 *sizebuf = '\0'; 1898 if (pdata >= 0) { 1899 union sockunion from; 1900 socklen_t fromlen = ctrl_addr.su_len; 1901 int flags, s; 1902 struct timeval timeout; 1903 fd_set set; 1904 1905 FD_ZERO(&set); 1906 FD_SET(pdata, &set); 1907 1908 timeout.tv_usec = 0; 1909 timeout.tv_sec = 120; 1910 1911 /* 1912 * Granted a socket is in the blocking I/O mode, 1913 * accept() will block after a successful select() 1914 * if the selected connection dies in between. 1915 * Therefore set the non-blocking I/O flag here. 1916 */ 1917 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1918 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1919 goto pdata_err; 1920 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1921 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1922 goto pdata_err; 1923 close(pdata); 1924 pdata = s; 1925 /* 1926 * Unset the inherited non-blocking I/O flag 1927 * on the child socket so stdio can work on it. 1928 */ 1929 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1930 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1931 goto pdata_err; 1932 #ifdef IP_TOS 1933 if (from.su_family == AF_INET) 1934 { 1935 tos = IPTOS_THROUGHPUT; 1936 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1937 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1938 } 1939 #endif 1940 reply(150, "Opening %s mode data connection for '%s'%s.", 1941 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1942 return (fdopen(pdata, mode)); 1943 pdata_err: 1944 reply(425, "Can't open data connection."); 1945 close(pdata); 1946 pdata = -1; 1947 return (NULL); 1948 } 1949 if (data >= 0) { 1950 reply(125, "Using existing data connection for '%s'%s.", 1951 name, sizebuf); 1952 usedefault = 1; 1953 return (fdopen(data, mode)); 1954 } 1955 if (usedefault) 1956 data_dest = his_addr; 1957 usedefault = 1; 1958 do { 1959 file = getdatasock(mode); 1960 if (file == NULL) { 1961 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1962 1963 if (getnameinfo((struct sockaddr *)&data_source, 1964 data_source.su_len, 1965 hostbuf, sizeof(hostbuf) - 1, 1966 portbuf, sizeof(portbuf) - 1, 1967 NI_NUMERICHOST|NI_NUMERICSERV)) 1968 *hostbuf = *portbuf = 0; 1969 hostbuf[sizeof(hostbuf) - 1] = 0; 1970 portbuf[sizeof(portbuf) - 1] = 0; 1971 reply(425, "Can't create data socket (%s,%s): %s.", 1972 hostbuf, portbuf, strerror(errno)); 1973 return (NULL); 1974 } 1975 data = fileno(file); 1976 conerrno = 0; 1977 if (connect(data, (struct sockaddr *)&data_dest, 1978 data_dest.su_len) == 0) 1979 break; 1980 conerrno = errno; 1981 fclose(file); 1982 data = -1; 1983 if (conerrno == EADDRINUSE) { 1984 sleep(swaitint); 1985 retry += swaitint; 1986 } else { 1987 break; 1988 } 1989 } while (retry <= swaitmax); 1990 if (conerrno != 0) { 1991 reply(425, "Can't build data connection: %s.", 1992 strerror(conerrno)); 1993 return (NULL); 1994 } 1995 reply(150, "Opening %s mode data connection for '%s'%s.", 1996 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1997 return (file); 1998 } 1999 2000 /* 2001 * A helper macro to avoid code duplication 2002 * in send_data() and receive_data(). 2003 * 2004 * XXX We have to block SIGURG during putc() because BSD stdio 2005 * is unable to restart interrupted write operations and hence 2006 * the entire buffer contents will be lost as soon as a write() 2007 * call indicates EINTR to stdio. 2008 */ 2009 #define FTPD_PUTC(ch, file, label) \ 2010 do { \ 2011 int ret; \ 2012 \ 2013 do { \ 2014 START_UNSAFE; \ 2015 ret = putc((ch), (file)); \ 2016 END_UNSAFE; \ 2017 CHECKOOB(return (-1)) \ 2018 else if (ferror(file)) \ 2019 goto label; \ 2020 clearerr(file); \ 2021 } while (ret == EOF); \ 2022 } while (0) 2023 2024 /* 2025 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2026 * encapsulation of the data subject to Mode, Structure, and Type. 2027 * 2028 * NB: Form isn't handled. 2029 */ 2030 static int 2031 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2032 { 2033 int c, cp, filefd, netfd; 2034 char *buf; 2035 2036 STARTXFER; 2037 2038 switch (type) { 2039 2040 case TYPE_A: 2041 cp = EOF; 2042 for (;;) { 2043 c = getc(instr); 2044 CHECKOOB(return (-1)) 2045 else if (c == EOF && ferror(instr)) 2046 goto file_err; 2047 if (c == EOF) { 2048 if (ferror(instr)) { /* resume after OOB */ 2049 clearerr(instr); 2050 continue; 2051 } 2052 if (feof(instr)) /* EOF */ 2053 break; 2054 syslog(LOG_ERR, "Internal: impossible condition" 2055 " on file after getc()"); 2056 goto file_err; 2057 } 2058 if (c == '\n' && cp != '\r') { 2059 FTPD_PUTC('\r', outstr, data_err); 2060 byte_count++; 2061 } 2062 FTPD_PUTC(c, outstr, data_err); 2063 byte_count++; 2064 cp = c; 2065 } 2066 #ifdef notyet /* BSD stdio isn't ready for that */ 2067 while (fflush(outstr) == EOF) { 2068 CHECKOOB(return (-1)) 2069 else 2070 goto data_err; 2071 clearerr(outstr); 2072 } 2073 ENDXFER; 2074 #else 2075 ENDXFER; 2076 if (fflush(outstr) == EOF) 2077 goto data_err; 2078 #endif 2079 reply(226, "Transfer complete."); 2080 return (0); 2081 2082 case TYPE_I: 2083 case TYPE_L: 2084 /* 2085 * isreg is only set if we are not doing restart and we 2086 * are sending a regular file 2087 */ 2088 netfd = fileno(outstr); 2089 filefd = fileno(instr); 2090 2091 if (isreg) { 2092 char *msg = "Transfer complete."; 2093 off_t cnt, offset; 2094 int err; 2095 2096 cnt = offset = 0; 2097 2098 while (filesize > 0) { 2099 err = sendfile(filefd, netfd, offset, 0, 2100 NULL, &cnt, 0); 2101 /* 2102 * Calculate byte_count before OOB processing. 2103 * It can be used in myoob() later. 2104 */ 2105 byte_count += cnt; 2106 offset += cnt; 2107 filesize -= cnt; 2108 CHECKOOB(return (-1)) 2109 else if (err == -1) { 2110 if (errno != EINTR && 2111 cnt == 0 && offset == 0) 2112 goto oldway; 2113 goto data_err; 2114 } 2115 if (err == -1) /* resume after OOB */ 2116 continue; 2117 /* 2118 * We hit the EOF prematurely. 2119 * Perhaps the file was externally truncated. 2120 */ 2121 if (cnt == 0) { 2122 msg = "Transfer finished due to " 2123 "premature end of file."; 2124 break; 2125 } 2126 } 2127 ENDXFER; 2128 reply(226, "%s", msg); 2129 return (0); 2130 } 2131 2132 oldway: 2133 if ((buf = malloc(blksize)) == NULL) { 2134 ENDXFER; 2135 reply(451, "Ran out of memory."); 2136 return (-1); 2137 } 2138 2139 for (;;) { 2140 int cnt, len; 2141 char *bp; 2142 2143 cnt = read(filefd, buf, blksize); 2144 CHECKOOB(free(buf); return (-1)) 2145 else if (cnt < 0) { 2146 free(buf); 2147 goto file_err; 2148 } 2149 if (cnt < 0) /* resume after OOB */ 2150 continue; 2151 if (cnt == 0) /* EOF */ 2152 break; 2153 for (len = cnt, bp = buf; len > 0;) { 2154 cnt = write(netfd, bp, len); 2155 CHECKOOB(free(buf); return (-1)) 2156 else if (cnt < 0) { 2157 free(buf); 2158 goto data_err; 2159 } 2160 if (cnt <= 0) 2161 continue; 2162 len -= cnt; 2163 bp += cnt; 2164 byte_count += cnt; 2165 } 2166 } 2167 ENDXFER; 2168 free(buf); 2169 reply(226, "Transfer complete."); 2170 return (0); 2171 default: 2172 ENDXFER; 2173 reply(550, "Unimplemented TYPE %d in send_data.", type); 2174 return (-1); 2175 } 2176 2177 data_err: 2178 ENDXFER; 2179 perror_reply(426, "Data connection"); 2180 return (-1); 2181 2182 file_err: 2183 ENDXFER; 2184 perror_reply(551, "Error on input file"); 2185 return (-1); 2186 } 2187 2188 /* 2189 * Transfer data from peer to "outstr" using the appropriate encapulation of 2190 * the data subject to Mode, Structure, and Type. 2191 * 2192 * N.B.: Form isn't handled. 2193 */ 2194 static int 2195 receive_data(FILE *instr, FILE *outstr) 2196 { 2197 int c, cp; 2198 int bare_lfs = 0; 2199 2200 STARTXFER; 2201 2202 switch (type) { 2203 2204 case TYPE_I: 2205 case TYPE_L: 2206 for (;;) { 2207 int cnt, len; 2208 char *bp; 2209 char buf[BUFSIZ]; 2210 2211 cnt = read(fileno(instr), buf, sizeof(buf)); 2212 CHECKOOB(return (-1)) 2213 else if (cnt < 0) 2214 goto data_err; 2215 if (cnt < 0) /* resume after OOB */ 2216 continue; 2217 if (cnt == 0) /* EOF */ 2218 break; 2219 for (len = cnt, bp = buf; len > 0;) { 2220 cnt = write(fileno(outstr), bp, len); 2221 CHECKOOB(return (-1)) 2222 else if (cnt < 0) 2223 goto file_err; 2224 if (cnt <= 0) 2225 continue; 2226 len -= cnt; 2227 bp += cnt; 2228 byte_count += cnt; 2229 } 2230 } 2231 ENDXFER; 2232 return (0); 2233 2234 case TYPE_E: 2235 ENDXFER; 2236 reply(553, "TYPE E not implemented."); 2237 return (-1); 2238 2239 case TYPE_A: 2240 cp = EOF; 2241 for (;;) { 2242 c = getc(instr); 2243 CHECKOOB(return (-1)) 2244 else if (c == EOF && ferror(instr)) 2245 goto data_err; 2246 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2247 clearerr(instr); 2248 continue; 2249 } 2250 2251 if (cp == '\r') { 2252 if (c != '\n') 2253 FTPD_PUTC('\r', outstr, file_err); 2254 } else 2255 if (c == '\n') 2256 bare_lfs++; 2257 if (c == '\r') { 2258 byte_count++; 2259 cp = c; 2260 continue; 2261 } 2262 2263 /* Check for EOF here in order not to lose last \r. */ 2264 if (c == EOF) { 2265 if (feof(instr)) /* EOF */ 2266 break; 2267 syslog(LOG_ERR, "Internal: impossible condition" 2268 " on data stream after getc()"); 2269 goto data_err; 2270 } 2271 2272 byte_count++; 2273 FTPD_PUTC(c, outstr, file_err); 2274 cp = c; 2275 } 2276 #ifdef notyet /* BSD stdio isn't ready for that */ 2277 while (fflush(outstr) == EOF) { 2278 CHECKOOB(return (-1)) 2279 else 2280 goto file_err; 2281 clearerr(outstr); 2282 } 2283 ENDXFER; 2284 #else 2285 ENDXFER; 2286 if (fflush(outstr) == EOF) 2287 goto file_err; 2288 #endif 2289 if (bare_lfs) { 2290 lreply(226, 2291 "WARNING! %d bare linefeeds received in ASCII mode.", 2292 bare_lfs); 2293 printf(" File may not have transferred correctly.\r\n"); 2294 } 2295 return (0); 2296 default: 2297 ENDXFER; 2298 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2299 return (-1); 2300 } 2301 2302 data_err: 2303 ENDXFER; 2304 perror_reply(426, "Data connection"); 2305 return (-1); 2306 2307 file_err: 2308 ENDXFER; 2309 perror_reply(452, "Error writing to file"); 2310 return (-1); 2311 } 2312 2313 void 2314 statfilecmd(char *filename) 2315 { 2316 FILE *fin; 2317 int atstart; 2318 int c, code; 2319 char line[LINE_MAX]; 2320 struct stat st; 2321 2322 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2323 snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2324 fin = ftpd_popen(line, "r"); 2325 lreply(code, "Status of %s:", filename); 2326 atstart = 1; 2327 while ((c = getc(fin)) != EOF) { 2328 if (c == '\n') { 2329 if (ferror(stdout)){ 2330 perror_reply(421, "Control connection"); 2331 ftpd_pclose(fin); 2332 dologout(1); 2333 /* NOTREACHED */ 2334 } 2335 if (ferror(fin)) { 2336 perror_reply(551, filename); 2337 ftpd_pclose(fin); 2338 return; 2339 } 2340 putc('\r', stdout); 2341 } 2342 /* 2343 * RFC 959 says neutral text should be prepended before 2344 * a leading 3-digit number followed by whitespace, but 2345 * many ftp clients can be confused by any leading digits, 2346 * as a matter of fact. 2347 */ 2348 if (atstart && isdigit(c)) 2349 putc(' ', stdout); 2350 putc(c, stdout); 2351 atstart = (c == '\n'); 2352 } 2353 ftpd_pclose(fin); 2354 reply(code, "End of status."); 2355 } 2356 2357 void 2358 statcmd(void) 2359 { 2360 union sockunion *su; 2361 u_char *a, *p; 2362 char hname[NI_MAXHOST]; 2363 int ispassive; 2364 2365 if (hostinfo) { 2366 lreply(211, "%s FTP server status:", hostname); 2367 printf(" %s\r\n", version); 2368 } else 2369 lreply(211, "FTP server status:"); 2370 printf(" Connected to %s", remotehost); 2371 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2372 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2373 hname[sizeof(hname) - 1] = 0; 2374 if (strcmp(hname, remotehost) != 0) 2375 printf(" (%s)", hname); 2376 } 2377 printf("\r\n"); 2378 if (logged_in) { 2379 if (guest) 2380 printf(" Logged in anonymously\r\n"); 2381 else 2382 printf(" Logged in as %s\r\n", pw->pw_name); 2383 } else if (askpasswd) 2384 printf(" Waiting for password\r\n"); 2385 else 2386 printf(" Waiting for user name\r\n"); 2387 printf(" TYPE: %s", typenames[type]); 2388 if (type == TYPE_A || type == TYPE_E) 2389 printf(", FORM: %s", formnames[form]); 2390 if (type == TYPE_L) 2391 #if CHAR_BIT == 8 2392 printf(" %d", CHAR_BIT); 2393 #else 2394 printf(" %d", bytesize); /* need definition! */ 2395 #endif 2396 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2397 strunames[stru], modenames[mode]); 2398 if (data != -1) 2399 printf(" Data connection open\r\n"); 2400 else if (pdata != -1) { 2401 ispassive = 1; 2402 su = &pasv_addr; 2403 goto printaddr; 2404 } else if (usedefault == 0) { 2405 ispassive = 0; 2406 su = &data_dest; 2407 printaddr: 2408 #define UC(b) (((int) b) & 0xff) 2409 if (epsvall) { 2410 printf(" EPSV only mode (EPSV ALL)\r\n"); 2411 goto epsvonly; 2412 } 2413 2414 /* PORT/PASV */ 2415 if (su->su_family == AF_INET) { 2416 a = (u_char *) &su->su_sin.sin_addr; 2417 p = (u_char *) &su->su_sin.sin_port; 2418 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2419 ispassive ? "PASV" : "PORT", 2420 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2421 UC(p[0]), UC(p[1])); 2422 } 2423 2424 /* LPRT/LPSV */ 2425 { 2426 int alen, af, i; 2427 2428 switch (su->su_family) { 2429 case AF_INET: 2430 a = (u_char *) &su->su_sin.sin_addr; 2431 p = (u_char *) &su->su_sin.sin_port; 2432 alen = sizeof(su->su_sin.sin_addr); 2433 af = 4; 2434 break; 2435 case AF_INET6: 2436 a = (u_char *) &su->su_sin6.sin6_addr; 2437 p = (u_char *) &su->su_sin6.sin6_port; 2438 alen = sizeof(su->su_sin6.sin6_addr); 2439 af = 6; 2440 break; 2441 default: 2442 af = 0; 2443 break; 2444 } 2445 if (af) { 2446 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2447 af, alen); 2448 for (i = 0; i < alen; i++) 2449 printf("%d,", UC(a[i])); 2450 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2451 } 2452 } 2453 2454 epsvonly:; 2455 /* EPRT/EPSV */ 2456 { 2457 int af; 2458 2459 switch (su->su_family) { 2460 case AF_INET: 2461 af = 1; 2462 break; 2463 case AF_INET6: 2464 af = 2; 2465 break; 2466 default: 2467 af = 0; 2468 break; 2469 } 2470 if (af) { 2471 union sockunion tmp; 2472 2473 tmp = *su; 2474 if (tmp.su_family == AF_INET6) 2475 tmp.su_sin6.sin6_scope_id = 0; 2476 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2477 hname, sizeof(hname) - 1, NULL, 0, 2478 NI_NUMERICHOST)) { 2479 hname[sizeof(hname) - 1] = 0; 2480 printf(" %s |%d|%s|%d|\r\n", 2481 ispassive ? "EPSV" : "EPRT", 2482 af, hname, htons(tmp.su_port)); 2483 } 2484 } 2485 } 2486 #undef UC 2487 } else 2488 printf(" No data connection\r\n"); 2489 reply(211, "End of status."); 2490 } 2491 2492 void 2493 fatalerror(char *s) 2494 { 2495 2496 reply(451, "Error in server: %s", s); 2497 reply(221, "Closing connection due to server error."); 2498 dologout(0); 2499 /* NOTREACHED */ 2500 } 2501 2502 void 2503 reply(int n, const char *fmt, ...) 2504 { 2505 va_list ap; 2506 2507 printf("%d ", n); 2508 va_start(ap, fmt); 2509 vprintf(fmt, ap); 2510 va_end(ap); 2511 printf("\r\n"); 2512 fflush(stdout); 2513 if (ftpdebug) { 2514 syslog(LOG_DEBUG, "<--- %d ", n); 2515 va_start(ap, fmt); 2516 vsyslog(LOG_DEBUG, fmt, ap); 2517 va_end(ap); 2518 } 2519 } 2520 2521 void 2522 lreply(int n, const char *fmt, ...) 2523 { 2524 va_list ap; 2525 2526 printf("%d- ", n); 2527 va_start(ap, fmt); 2528 vprintf(fmt, ap); 2529 va_end(ap); 2530 printf("\r\n"); 2531 fflush(stdout); 2532 if (ftpdebug) { 2533 syslog(LOG_DEBUG, "<--- %d- ", n); 2534 va_start(ap, fmt); 2535 vsyslog(LOG_DEBUG, fmt, ap); 2536 va_end(ap); 2537 } 2538 } 2539 2540 static void 2541 ack(char *s) 2542 { 2543 2544 reply(250, "%s command successful.", s); 2545 } 2546 2547 void 2548 nack(char *s) 2549 { 2550 2551 reply(502, "%s command not implemented.", s); 2552 } 2553 2554 /* ARGSUSED */ 2555 void 2556 yyerror(char *s) 2557 { 2558 char *cp; 2559 2560 if ((cp = strchr(cbuf,'\n'))) 2561 *cp = '\0'; 2562 reply(500, "%s: command not understood.", cbuf); 2563 } 2564 2565 void 2566 delete(char *name) 2567 { 2568 struct stat st; 2569 2570 LOGCMD("delete", name); 2571 if (lstat(name, &st) < 0) { 2572 perror_reply(550, name); 2573 return; 2574 } 2575 if (S_ISDIR(st.st_mode)) { 2576 if (rmdir(name) < 0) { 2577 perror_reply(550, name); 2578 return; 2579 } 2580 goto done; 2581 } 2582 if (guest && noguestmod) { 2583 reply(550, "Operation not permitted."); 2584 return; 2585 } 2586 if (unlink(name) < 0) { 2587 perror_reply(550, name); 2588 return; 2589 } 2590 done: 2591 ack("DELE"); 2592 } 2593 2594 void 2595 cwd(char *path) 2596 { 2597 2598 if (chdir(path) < 0) 2599 perror_reply(550, path); 2600 else 2601 ack("CWD"); 2602 } 2603 2604 void 2605 makedir(char *name) 2606 { 2607 char *s; 2608 2609 LOGCMD("mkdir", name); 2610 if (guest && noguestmkd) 2611 reply(550, "Operation not permitted."); 2612 else if (mkdir(name, 0777) < 0) 2613 perror_reply(550, name); 2614 else { 2615 if ((s = doublequote(name)) == NULL) 2616 fatalerror("Ran out of memory."); 2617 reply(257, "\"%s\" directory created.", s); 2618 free(s); 2619 } 2620 } 2621 2622 void 2623 removedir(char *name) 2624 { 2625 2626 LOGCMD("rmdir", name); 2627 if (rmdir(name) < 0) 2628 perror_reply(550, name); 2629 else 2630 ack("RMD"); 2631 } 2632 2633 void 2634 pwd(void) 2635 { 2636 char *s, path[MAXPATHLEN + 1]; 2637 2638 if (getcwd(path, sizeof(path)) == NULL) 2639 perror_reply(550, "Get current directory"); 2640 else { 2641 if ((s = doublequote(path)) == NULL) 2642 fatalerror("Ran out of memory."); 2643 reply(257, "\"%s\" is current directory.", s); 2644 free(s); 2645 } 2646 } 2647 2648 char * 2649 renamefrom(char *name) 2650 { 2651 struct stat st; 2652 2653 if (guest && noguestmod) { 2654 reply(550, "Operation not permitted."); 2655 return (NULL); 2656 } 2657 if (lstat(name, &st) < 0) { 2658 perror_reply(550, name); 2659 return (NULL); 2660 } 2661 reply(350, "File exists, ready for destination name."); 2662 return (name); 2663 } 2664 2665 void 2666 renamecmd(char *from, char *to) 2667 { 2668 struct stat st; 2669 2670 LOGCMD2("rename", from, to); 2671 2672 if (guest && (stat(to, &st) == 0)) { 2673 reply(550, "%s: permission denied.", to); 2674 return; 2675 } 2676 2677 if (rename(from, to) < 0) 2678 perror_reply(550, "rename"); 2679 else 2680 ack("RNTO"); 2681 } 2682 2683 static void 2684 dolog(struct sockaddr *who) 2685 { 2686 char who_name[NI_MAXHOST]; 2687 2688 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2689 remotehost[sizeof(remotehost) - 1] = 0; 2690 if (getnameinfo(who, who->sa_len, 2691 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2692 *who_name = 0; 2693 who_name[sizeof(who_name) - 1] = 0; 2694 2695 #ifdef SETPROCTITLE 2696 #ifdef VIRTUAL_HOSTING 2697 if (thishost != firsthost) 2698 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2699 remotehost, hostname); 2700 else 2701 #endif 2702 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2703 remotehost); 2704 setproctitle("%s", proctitle); 2705 #endif /* SETPROCTITLE */ 2706 2707 if (logging) { 2708 #ifdef VIRTUAL_HOSTING 2709 if (thishost != firsthost) 2710 syslog(LOG_INFO, "connection from %s (%s) to %s", 2711 remotehost, who_name, hostname); 2712 else 2713 #endif 2714 syslog(LOG_INFO, "connection from %s (%s)", 2715 remotehost, who_name); 2716 } 2717 } 2718 2719 /* 2720 * Record logout in wtmp file 2721 * and exit with supplied status. 2722 */ 2723 void 2724 dologout(int status) 2725 { 2726 2727 if (logged_in && dowtmp) { 2728 seteuid(0); 2729 ftpd_logwtmp(ttyline, "", NULL); 2730 } 2731 /* beware of flushing buffers after a SIGPIPE */ 2732 _exit(status); 2733 } 2734 2735 static void 2736 sigurg(int signo) 2737 { 2738 2739 recvurg = 1; 2740 } 2741 2742 static void 2743 maskurg(int flag) 2744 { 2745 int oerrno; 2746 sigset_t sset; 2747 2748 if (!transflag) { 2749 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2750 return; 2751 } 2752 oerrno = errno; 2753 sigemptyset(&sset); 2754 sigaddset(&sset, SIGURG); 2755 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2756 errno = oerrno; 2757 } 2758 2759 static void 2760 flagxfer(int flag) 2761 { 2762 2763 if (flag) { 2764 if (transflag) 2765 syslog(LOG_ERR, "Internal: flagxfer(1): " 2766 "transfer already under way"); 2767 transflag = 1; 2768 maskurg(0); 2769 recvurg = 0; 2770 } else { 2771 if (!transflag) 2772 syslog(LOG_ERR, "Internal: flagxfer(0): " 2773 "no active transfer"); 2774 maskurg(1); 2775 transflag = 0; 2776 } 2777 } 2778 2779 /* 2780 * Returns 0 if OK to resume or -1 if abort requested. 2781 */ 2782 static int 2783 myoob(void) 2784 { 2785 char *cp; 2786 int ret; 2787 2788 if (!transflag) { 2789 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2790 return (0); 2791 } 2792 cp = tmpline; 2793 ret = get_line(cp, 7, stdin); 2794 if (ret == -1) { 2795 reply(221, "You could at least say goodbye."); 2796 dologout(0); 2797 } else if (ret == -2) { 2798 /* Ignore truncated command. */ 2799 return (0); 2800 } 2801 upper(cp); 2802 if (strcmp(cp, "ABOR\r\n") == 0) { 2803 tmpline[0] = '\0'; 2804 reply(426, "Transfer aborted. Data connection closed."); 2805 reply(226, "Abort successful."); 2806 return (-1); 2807 } 2808 if (strcmp(cp, "STAT\r\n") == 0) { 2809 tmpline[0] = '\0'; 2810 if (file_size != -1) 2811 reply(213, "Status: %jd of %jd bytes transferred.", 2812 (intmax_t)byte_count, (intmax_t)file_size); 2813 else 2814 reply(213, "Status: %jd bytes transferred.", 2815 (intmax_t)byte_count); 2816 } 2817 return (0); 2818 } 2819 2820 /* 2821 * Note: a response of 425 is not mentioned as a possible response to 2822 * the PASV command in RFC959. However, it has been blessed as 2823 * a legitimate response by Jon Postel in a telephone conversation 2824 * with Rick Adams on 25 Jan 89. 2825 */ 2826 void 2827 passive(void) 2828 { 2829 socklen_t len; 2830 int on; 2831 char *p, *a; 2832 2833 if (pdata >= 0) /* close old port if one set */ 2834 close(pdata); 2835 2836 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2837 if (pdata < 0) { 2838 perror_reply(425, "Can't open passive connection"); 2839 return; 2840 } 2841 on = 1; 2842 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2843 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2844 2845 seteuid(0); 2846 2847 #ifdef IP_PORTRANGE 2848 if (ctrl_addr.su_family == AF_INET) { 2849 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2850 : IP_PORTRANGE_DEFAULT; 2851 2852 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2853 &on, sizeof(on)) < 0) 2854 goto pasv_error; 2855 } 2856 #endif 2857 #ifdef IPV6_PORTRANGE 2858 if (ctrl_addr.su_family == AF_INET6) { 2859 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2860 : IPV6_PORTRANGE_DEFAULT; 2861 2862 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2863 &on, sizeof(on)) < 0) 2864 goto pasv_error; 2865 } 2866 #endif 2867 2868 pasv_addr = ctrl_addr; 2869 pasv_addr.su_port = 0; 2870 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2871 goto pasv_error; 2872 2873 seteuid(pw->pw_uid); 2874 2875 len = sizeof(pasv_addr); 2876 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2877 goto pasv_error; 2878 if (listen(pdata, 1) < 0) 2879 goto pasv_error; 2880 if (pasv_addr.su_family == AF_INET) 2881 a = (char *) &pasv_addr.su_sin.sin_addr; 2882 else if (pasv_addr.su_family == AF_INET6 && 2883 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2884 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2885 else 2886 goto pasv_error; 2887 2888 p = (char *) &pasv_addr.su_port; 2889 2890 #define UC(b) (((int) b) & 0xff) 2891 2892 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2893 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2894 return; 2895 2896 pasv_error: 2897 seteuid(pw->pw_uid); 2898 close(pdata); 2899 pdata = -1; 2900 perror_reply(425, "Can't open passive connection"); 2901 return; 2902 } 2903 2904 /* 2905 * Long Passive defined in RFC 1639. 2906 * 228 Entering Long Passive Mode 2907 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2908 */ 2909 2910 void 2911 long_passive(char *cmd, int pf) 2912 { 2913 socklen_t len; 2914 int on; 2915 char *p, *a; 2916 2917 if (pdata >= 0) /* close old port if one set */ 2918 close(pdata); 2919 2920 if (pf != PF_UNSPEC) { 2921 if (ctrl_addr.su_family != pf) { 2922 switch (ctrl_addr.su_family) { 2923 case AF_INET: 2924 pf = 1; 2925 break; 2926 case AF_INET6: 2927 pf = 2; 2928 break; 2929 default: 2930 pf = 0; 2931 break; 2932 } 2933 /* 2934 * XXX 2935 * only EPRT/EPSV ready clients will understand this 2936 */ 2937 if (strcmp(cmd, "EPSV") == 0 && pf) { 2938 reply(522, "Network protocol mismatch, " 2939 "use (%d)", pf); 2940 } else 2941 reply(501, "Network protocol mismatch."); /*XXX*/ 2942 2943 return; 2944 } 2945 } 2946 2947 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2948 if (pdata < 0) { 2949 perror_reply(425, "Can't open passive connection"); 2950 return; 2951 } 2952 on = 1; 2953 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2954 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2955 2956 seteuid(0); 2957 2958 pasv_addr = ctrl_addr; 2959 pasv_addr.su_port = 0; 2960 len = pasv_addr.su_len; 2961 2962 #ifdef IP_PORTRANGE 2963 if (ctrl_addr.su_family == AF_INET) { 2964 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2965 : IP_PORTRANGE_DEFAULT; 2966 2967 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2968 &on, sizeof(on)) < 0) 2969 goto pasv_error; 2970 } 2971 #endif 2972 #ifdef IPV6_PORTRANGE 2973 if (ctrl_addr.su_family == AF_INET6) { 2974 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2975 : IPV6_PORTRANGE_DEFAULT; 2976 2977 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2978 &on, sizeof(on)) < 0) 2979 goto pasv_error; 2980 } 2981 #endif 2982 2983 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2984 goto pasv_error; 2985 2986 seteuid(pw->pw_uid); 2987 2988 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2989 goto pasv_error; 2990 if (listen(pdata, 1) < 0) 2991 goto pasv_error; 2992 2993 #define UC(b) (((int) b) & 0xff) 2994 2995 if (strcmp(cmd, "LPSV") == 0) { 2996 p = (char *)&pasv_addr.su_port; 2997 switch (pasv_addr.su_family) { 2998 case AF_INET: 2999 a = (char *) &pasv_addr.su_sin.sin_addr; 3000 v4_reply: 3001 reply(228, 3002 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3003 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3004 2, UC(p[0]), UC(p[1])); 3005 return; 3006 case AF_INET6: 3007 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3008 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3009 goto v4_reply; 3010 } 3011 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3012 reply(228, 3013 "Entering Long Passive Mode " 3014 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3015 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3016 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3017 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3018 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3019 2, UC(p[0]), UC(p[1])); 3020 return; 3021 } 3022 } else if (strcmp(cmd, "EPSV") == 0) { 3023 switch (pasv_addr.su_family) { 3024 case AF_INET: 3025 case AF_INET6: 3026 reply(229, "Entering Extended Passive Mode (|||%d|)", 3027 ntohs(pasv_addr.su_port)); 3028 return; 3029 } 3030 } else { 3031 /* more proper error code? */ 3032 } 3033 3034 pasv_error: 3035 seteuid(pw->pw_uid); 3036 close(pdata); 3037 pdata = -1; 3038 perror_reply(425, "Can't open passive connection"); 3039 return; 3040 } 3041 3042 /* 3043 * Generate unique name for file with basename "local" 3044 * and open the file in order to avoid possible races. 3045 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3046 * Return descriptor to the file, set "name" to its name. 3047 * 3048 * Generates failure reply on error. 3049 */ 3050 static int 3051 guniquefd(char *local, char **name) 3052 { 3053 static char new[MAXPATHLEN]; 3054 struct stat st; 3055 char *cp; 3056 int count; 3057 int fd; 3058 3059 cp = strrchr(local, '/'); 3060 if (cp) 3061 *cp = '\0'; 3062 if (stat(cp ? local : ".", &st) < 0) { 3063 perror_reply(553, cp ? local : "."); 3064 return (-1); 3065 } 3066 if (cp) { 3067 /* 3068 * Let not overwrite dirname with counter suffix. 3069 * -4 is for /nn\0 3070 * In this extreme case dot won't be put in front of suffix. 3071 */ 3072 if (strlen(local) > sizeof(new) - 4) { 3073 reply(553, "Pathname too long."); 3074 return (-1); 3075 } 3076 *cp = '/'; 3077 } 3078 /* -4 is for the .nn<null> we put on the end below */ 3079 snprintf(new, sizeof(new) - 4, "%s", local); 3080 cp = new + strlen(new); 3081 /* 3082 * Don't generate dotfile unless requested explicitly. 3083 * This covers the case when basename gets truncated off 3084 * by buffer size. 3085 */ 3086 if (cp > new && cp[-1] != '/') 3087 *cp++ = '.'; 3088 for (count = 0; count < 100; count++) { 3089 /* At count 0 try unmodified name */ 3090 if (count) 3091 sprintf(cp, "%d", count); 3092 if ((fd = open(count ? new : local, 3093 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3094 *name = count ? new : local; 3095 return (fd); 3096 } 3097 if (errno != EEXIST) { 3098 perror_reply(553, count ? new : local); 3099 return (-1); 3100 } 3101 } 3102 reply(452, "Unique file name cannot be created."); 3103 return (-1); 3104 } 3105 3106 /* 3107 * Format and send reply containing system error number. 3108 */ 3109 void 3110 perror_reply(int code, char *string) 3111 { 3112 3113 reply(code, "%s: %s.", string, strerror(errno)); 3114 } 3115 3116 static char *onefile[] = { 3117 "", 3118 0 3119 }; 3120 3121 void 3122 send_file_list(char *whichf) 3123 { 3124 struct stat st; 3125 DIR *dirp = NULL; 3126 struct dirent *dir; 3127 FILE *dout = NULL; 3128 char **dirlist, *dirname; 3129 int simple = 0; 3130 int freeglob = 0; 3131 glob_t gl; 3132 3133 if (strpbrk(whichf, "~{[*?") != NULL) { 3134 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3135 3136 memset(&gl, 0, sizeof(gl)); 3137 gl.gl_matchc = MAXGLOBARGS; 3138 /*flags |= GLOB_LIMIT;*/ 3139 freeglob = 1; 3140 if (glob(whichf, flags, 0, &gl)) { 3141 reply(550, "No matching files found."); 3142 goto out; 3143 } else if (gl.gl_pathc == 0) { 3144 errno = ENOENT; 3145 perror_reply(550, whichf); 3146 goto out; 3147 } 3148 dirlist = gl.gl_pathv; 3149 } else { 3150 onefile[0] = whichf; 3151 dirlist = onefile; 3152 simple = 1; 3153 } 3154 3155 while ((dirname = *dirlist++)) { 3156 if (stat(dirname, &st) < 0) { 3157 /* 3158 * If user typed "ls -l", etc, and the client 3159 * used NLST, do what the user meant. 3160 */ 3161 if (dirname[0] == '-' && *dirlist == NULL && 3162 dout == NULL) 3163 retrieve(_PATH_LS " %s", dirname); 3164 else 3165 perror_reply(550, whichf); 3166 goto out; 3167 } 3168 3169 if (S_ISREG(st.st_mode)) { 3170 if (dout == NULL) { 3171 dout = dataconn("file list", -1, "w"); 3172 if (dout == NULL) 3173 goto out; 3174 STARTXFER; 3175 } 3176 START_UNSAFE; 3177 fprintf(dout, "%s%s\n", dirname, 3178 type == TYPE_A ? "\r" : ""); 3179 END_UNSAFE; 3180 if (ferror(dout)) 3181 goto data_err; 3182 byte_count += strlen(dirname) + 3183 (type == TYPE_A ? 2 : 1); 3184 CHECKOOB(goto abrt); 3185 continue; 3186 } else if (!S_ISDIR(st.st_mode)) 3187 continue; 3188 3189 if ((dirp = opendir(dirname)) == NULL) 3190 continue; 3191 3192 while ((dir = readdir(dirp)) != NULL) { 3193 char nbuf[MAXPATHLEN]; 3194 3195 CHECKOOB(goto abrt); 3196 3197 if (strcmp(dir->d_name, ".") == 0) 3198 continue; 3199 if (strcmp(dir->d_name, "..") == 0) 3200 continue; 3201 3202 snprintf(nbuf, sizeof(nbuf), 3203 "%s/%s", dirname, dir->d_name); 3204 3205 /* 3206 * We have to do a stat to insure it's 3207 * not a directory or special file. 3208 */ 3209 if (simple || (stat(nbuf, &st) == 0 && 3210 S_ISREG(st.st_mode))) { 3211 if (dout == NULL) { 3212 dout = dataconn("file list", -1, "w"); 3213 if (dout == NULL) 3214 goto out; 3215 STARTXFER; 3216 } 3217 START_UNSAFE; 3218 if (nbuf[0] == '.' && nbuf[1] == '/') 3219 fprintf(dout, "%s%s\n", &nbuf[2], 3220 type == TYPE_A ? "\r" : ""); 3221 else 3222 fprintf(dout, "%s%s\n", nbuf, 3223 type == TYPE_A ? "\r" : ""); 3224 END_UNSAFE; 3225 if (ferror(dout)) 3226 goto data_err; 3227 byte_count += strlen(nbuf) + 3228 (type == TYPE_A ? 2 : 1); 3229 CHECKOOB(goto abrt); 3230 } 3231 } 3232 closedir(dirp); 3233 dirp = NULL; 3234 } 3235 3236 if (dout == NULL) 3237 reply(550, "No files found."); 3238 else if (ferror(dout)) 3239 data_err: perror_reply(550, "Data connection"); 3240 else 3241 reply(226, "Transfer complete."); 3242 out: 3243 if (dout) { 3244 ENDXFER; 3245 abrt: 3246 fclose(dout); 3247 data = -1; 3248 pdata = -1; 3249 } 3250 if (dirp) 3251 closedir(dirp); 3252 if (freeglob) { 3253 freeglob = 0; 3254 globfree(&gl); 3255 } 3256 } 3257 3258 void 3259 reapchild(int signo) 3260 { 3261 while (waitpid(-1, NULL, WNOHANG) > 0); 3262 } 3263 3264 static void 3265 appendf(char **strp, char *fmt, ...) 3266 { 3267 va_list ap; 3268 char *ostr, *p; 3269 3270 va_start(ap, fmt); 3271 vasprintf(&p, fmt, ap); 3272 va_end(ap); 3273 if (p == NULL) 3274 fatalerror("Ran out of memory."); 3275 if (*strp == NULL) 3276 *strp = p; 3277 else { 3278 ostr = *strp; 3279 asprintf(strp, "%s%s", ostr, p); 3280 if (*strp == NULL) 3281 fatalerror("Ran out of memory."); 3282 free(ostr); 3283 } 3284 } 3285 3286 static void 3287 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3288 { 3289 char *msg = NULL; 3290 char wd[MAXPATHLEN + 1]; 3291 3292 if (logging <= 1) 3293 return; 3294 3295 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3296 strcpy(wd, strerror(errno)); 3297 3298 appendf(&msg, "%s", cmd); 3299 if (file1) 3300 appendf(&msg, " %s", file1); 3301 if (file2) 3302 appendf(&msg, " %s", file2); 3303 if (cnt >= 0) 3304 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3305 appendf(&msg, " (wd: %s", wd); 3306 if (guest || dochroot) 3307 appendf(&msg, "; chrooted"); 3308 appendf(&msg, ")"); 3309 syslog(LOG_INFO, "%s", msg); 3310 free(msg); 3311 } 3312 3313 static void 3314 logxfer(char *name, off_t size, time_t start) 3315 { 3316 char buf[MAXPATHLEN + 1024]; 3317 char path[MAXPATHLEN + 1]; 3318 time_t now; 3319 3320 if (statfd >= 0) { 3321 time(&now); 3322 if (realpath(name, path) == NULL) { 3323 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3324 return; 3325 } 3326 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3327 ctime(&now)+4, ident, remotehost, 3328 path, (intmax_t)size, 3329 (long)(now - start + (now == start))); 3330 write(statfd, buf, strlen(buf)); 3331 } 3332 } 3333 3334 static char * 3335 doublequote(char *s) 3336 { 3337 int n; 3338 char *p, *s2; 3339 3340 for (p = s, n = 0; *p; p++) 3341 if (*p == '"') 3342 n++; 3343 3344 if ((s2 = malloc(p - s + n + 1)) == NULL) 3345 return (NULL); 3346 3347 for (p = s2; *s; s++, p++) { 3348 if ((*p = *s) == '"') 3349 *(++p) = '"'; 3350 } 3351 *p = '\0'; 3352 3353 return (s2); 3354 } 3355 3356 /* setup server socket for specified address family */ 3357 /* if af is PF_UNSPEC more than one socket may be returned */ 3358 /* the returned list is dynamically allocated, so caller needs to free it */ 3359 static int * 3360 socksetup(int af, char *bindname, const char *bindport) 3361 { 3362 struct addrinfo hints, *res, *r; 3363 int error, maxs, *s, *socks; 3364 const int on = 1; 3365 3366 memset(&hints, 0, sizeof(hints)); 3367 hints.ai_flags = AI_PASSIVE; 3368 hints.ai_family = af; 3369 hints.ai_socktype = SOCK_STREAM; 3370 error = getaddrinfo(bindname, bindport, &hints, &res); 3371 if (error) { 3372 syslog(LOG_ERR, "%s", gai_strerror(error)); 3373 if (error == EAI_SYSTEM) 3374 syslog(LOG_ERR, "%s", strerror(errno)); 3375 return NULL; 3376 } 3377 3378 /* Count max number of sockets we may open */ 3379 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3380 ; 3381 socks = malloc((maxs + 1) * sizeof(int)); 3382 if (!socks) { 3383 freeaddrinfo(res); 3384 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3385 return NULL; 3386 } 3387 3388 *socks = 0; /* num of sockets counter at start of array */ 3389 s = socks + 1; 3390 for (r = res; r; r = r->ai_next) { 3391 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3392 if (*s < 0) { 3393 syslog(LOG_DEBUG, "control socket: %m"); 3394 continue; 3395 } 3396 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3397 &on, sizeof(on)) < 0) 3398 syslog(LOG_WARNING, 3399 "control setsockopt (SO_REUSEADDR): %m"); 3400 if (r->ai_family == AF_INET6) { 3401 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3402 &on, sizeof(on)) < 0) 3403 syslog(LOG_WARNING, 3404 "control setsockopt (IPV6_V6ONLY): %m"); 3405 } 3406 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3407 syslog(LOG_DEBUG, "control bind: %m"); 3408 close(*s); 3409 continue; 3410 } 3411 (*socks)++; 3412 s++; 3413 } 3414 3415 if (res) 3416 freeaddrinfo(res); 3417 3418 if (*socks == 0) { 3419 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3420 free(socks); 3421 return NULL; 3422 } 3423 return(socks); 3424 } 3425