1 /* 2 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)ftpd.c 8.4 (Berkeley) 4/16/94 30 * $FreeBSD: src/libexec/ftpd/ftpd.c,v 1.213 2008/12/23 01:23:09 cperciva Exp $ 31 */ 32 33 /* 34 * FTP server. 35 */ 36 #include <sys/param.h> 37 #include <sys/ioctl.h> 38 #include <sys/mman.h> 39 #include <sys/socket.h> 40 #include <sys/stat.h> 41 #include <sys/time.h> 42 #include <sys/wait.h> 43 44 #include <netinet/in.h> 45 #include <netinet/in_systm.h> 46 #include <netinet/ip.h> 47 #include <netinet/tcp.h> 48 49 #define FTP_NAMES 50 #include <arpa/ftp.h> 51 #include <arpa/inet.h> 52 #include <arpa/telnet.h> 53 54 #include <ctype.h> 55 #include <dirent.h> 56 #include <err.h> 57 #include <errno.h> 58 #include <fcntl.h> 59 #include <glob.h> 60 #include <limits.h> 61 #include <netdb.h> 62 #include <pwd.h> 63 #include <grp.h> 64 #include <opie.h> 65 #include <signal.h> 66 #include <stdint.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <syslog.h> 71 #include <time.h> 72 #include <unistd.h> 73 #include <libutil.h> 74 #ifdef LOGIN_CAP 75 #include <login_cap.h> 76 #endif 77 78 #ifdef USE_PAM 79 #include <security/pam_appl.h> 80 #endif 81 82 #include "pathnames.h" 83 #include "extern.h" 84 #include "pidfile.h" 85 86 #include <stdarg.h> 87 88 static char version[] = "Version 6.00LS"; 89 #undef main 90 91 extern off_t restart_point; 92 extern char cbuf[]; 93 94 union sockunion ctrl_addr; 95 union sockunion data_source; 96 union sockunion data_dest; 97 union sockunion his_addr; 98 union sockunion pasv_addr; 99 100 int daemon_mode; 101 int data; 102 int dataport; 103 int hostinfo = 1; /* print host-specific info in messages */ 104 int logged_in; 105 struct passwd *pw; 106 char *homedir; 107 int ftpdebug; 108 int timeout = 900; /* timeout after 15 minutes of inactivity */ 109 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 110 int logging; 111 int restricted_data_ports = 1; 112 int paranoid = 1; /* be extra careful about security */ 113 int anon_only = 0; /* Only anonymous ftp allowed */ 114 int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 115 int guest; 116 int dochroot; 117 char *chrootdir; 118 int dowtmp = 1; 119 int stats; 120 int statfd = -1; 121 int type; 122 int form; 123 int stru; /* avoid C keyword */ 124 int mode; 125 int usedefault = 1; /* for data transfers */ 126 int pdata = -1; /* for passive mode */ 127 int readonly = 0; /* Server is in readonly mode. */ 128 int noepsv = 0; /* EPSV command is disabled. */ 129 int noretr = 0; /* RETR command is disabled. */ 130 int noguestretr = 0; /* RETR command is disabled for anon users. */ 131 int noguestmkd = 0; /* MKD command is disabled for anon users. */ 132 int noguestmod = 1; /* anon users may not modify existing files. */ 133 134 off_t file_size; 135 off_t byte_count; 136 #if !defined(CMASK) || CMASK == 0 137 #undef CMASK 138 #define CMASK 027 139 #endif 140 int defumask = CMASK; /* default umask value */ 141 char tmpline[7]; 142 char *hostname; 143 int epsvall = 0; 144 145 #ifdef VIRTUAL_HOSTING 146 char *ftpuser; 147 148 static struct ftphost { 149 struct ftphost *next; 150 struct addrinfo *hostinfo; 151 char *hostname; 152 char *anonuser; 153 char *statfile; 154 char *welcome; 155 char *loginmsg; 156 } *thishost, *firsthost; 157 158 #endif 159 char remotehost[NI_MAXHOST]; 160 char *ident = NULL; 161 162 static char ttyline[20]; 163 char *tty = ttyline; /* for klogin */ 164 165 #ifdef USE_PAM 166 static int auth_pam(struct passwd**, const char*); 167 pam_handle_t *pamh = NULL; 168 #endif 169 170 static struct opie opiedata; 171 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 172 static int pwok; 173 174 char *pid_file = NULL; /* means default location to pidfile(3) */ 175 176 /* 177 * Limit number of pathnames that glob can return. 178 * A limit of 0 indicates the number of pathnames is unlimited. 179 */ 180 #define MAXGLOBARGS 16384 181 182 /* 183 * Timeout intervals for retrying connections 184 * to hosts that don't accept PORT cmds. This 185 * is a kludge, but given the problems with TCP... 186 */ 187 #define SWAITMAX 90 /* wait at most 90 seconds */ 188 #define SWAITINT 5 /* interval between retries */ 189 190 int swaitmax = SWAITMAX; 191 int swaitint = SWAITINT; 192 193 #ifdef SETPROCTITLE 194 char proctitle[LINE_MAX]; /* initial part of title */ 195 #endif /* SETPROCTITLE */ 196 197 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 198 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 199 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 200 201 static volatile sig_atomic_t recvurg; 202 static int transflag; /* NB: for debugging only */ 203 204 #define STARTXFER flagxfer(1) 205 #define ENDXFER flagxfer(0) 206 207 #define START_UNSAFE maskurg(1) 208 #define END_UNSAFE maskurg(0) 209 210 /* It's OK to put an `else' clause after this macro. */ 211 #define CHECKOOB(action) \ 212 if (recvurg) { \ 213 recvurg = 0; \ 214 if (myoob()) { \ 215 ENDXFER; \ 216 action; \ 217 } \ 218 } 219 220 #ifdef VIRTUAL_HOSTING 221 static void inithosts(int); 222 static void selecthost(union sockunion *); 223 #endif 224 static void ack(char *); 225 static void sigurg(int); 226 static void maskurg(int); 227 static void flagxfer(int); 228 static int myoob(void); 229 static int checkuser(char *, char *, int, char **); 230 static FILE *dataconn(char *, off_t, char *); 231 static void dolog(struct sockaddr *); 232 static void end_login(void); 233 static FILE *getdatasock(char *); 234 static int guniquefd(char *, char **); 235 static void lostconn(int); 236 static void sigquit(int); 237 static int receive_data(FILE *, FILE *); 238 static int send_data(FILE *, FILE *, size_t, off_t, int); 239 static struct passwd * 240 sgetpwnam(char *); 241 static char *sgetsave(char *); 242 static void reapchild(int); 243 static void appendf(char **, char *, ...) __printflike(2, 3); 244 static void logcmd(char *, char *, char *, off_t); 245 static void logxfer(char *, off_t, time_t); 246 static char *doublequote(char *); 247 static int *socksetup(int, char *, const char *); 248 249 int 250 main(int argc, char *argv[]) 251 { 252 socklen_t addrlen; 253 int ch, on = 1, tos; 254 char *cp, line[LINE_MAX]; 255 FILE *fd; 256 char *bindname = NULL; 257 const char *bindport = "ftp"; 258 int family = AF_UNSPEC; 259 struct sigaction sa; 260 261 tzset(); /* in case no timezone database in ~ftp */ 262 sigemptyset(&sa.sa_mask); 263 sa.sa_flags = SA_RESTART; 264 265 /* 266 * Prevent diagnostic messages from appearing on stderr. 267 * We run as a daemon or from inetd; in both cases, there's 268 * more reason in logging to syslog. 269 */ 270 freopen(_PATH_DEVNULL, "w", stderr); 271 opterr = 0; 272 273 /* 274 * LOG_NDELAY sets up the logging connection immediately, 275 * necessary for anonymous ftp's that chroot and can't do it later. 276 */ 277 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 278 279 while ((ch = getopt(argc, argv, 280 "468a:AdDEH:hlmMoOp:P:rRSt:T:u:UvW")) != -1) { 281 switch (ch) { 282 case '4': 283 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 284 break; 285 286 case '6': 287 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 288 break; 289 290 case '8': 291 assumeutf8 = 1; 292 break; 293 294 case 'a': 295 bindname = optarg; 296 break; 297 298 case 'A': 299 anon_only = 1; 300 break; 301 302 case 'd': 303 ftpdebug++; 304 break; 305 306 case 'D': 307 daemon_mode++; 308 break; 309 310 case 'E': 311 noepsv = 1; 312 break; 313 314 case 'h': 315 hostinfo = 0; 316 break; 317 318 case 'H': 319 hostname = optarg; 320 break; 321 322 case 'l': 323 logging++; /* > 1 == extra logging */ 324 break; 325 326 case 'm': 327 noguestmod = 0; 328 break; 329 330 case 'M': 331 noguestmkd = 1; 332 break; 333 334 case 'o': 335 noretr = 1; 336 break; 337 338 case 'O': 339 noguestretr = 1; 340 break; 341 342 case 'p': 343 pid_file = optarg; 344 break; 345 346 case 'P': 347 bindport = optarg; 348 break; 349 350 case 'r': 351 readonly = 1; 352 break; 353 354 case 'R': 355 paranoid = 0; 356 break; 357 358 case 'S': 359 stats++; 360 break; 361 362 case 't': 363 timeout = atoi(optarg); 364 if (maxtimeout < timeout) 365 maxtimeout = timeout; 366 break; 367 368 case 'T': 369 maxtimeout = atoi(optarg); 370 if (timeout > maxtimeout) 371 timeout = maxtimeout; 372 break; 373 374 case 'u': 375 { 376 long val = 0; 377 378 val = strtol(optarg, &optarg, 8); 379 if (*optarg != '\0' || val < 0) 380 syslog(LOG_WARNING, "bad value for -u"); 381 else 382 defumask = val; 383 break; 384 } 385 case 'U': 386 restricted_data_ports = 0; 387 break; 388 389 case 'v': 390 ftpdebug++; 391 break; 392 393 case 'W': 394 dowtmp = 0; 395 break; 396 397 default: 398 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 399 break; 400 } 401 } 402 403 if (daemon_mode) { 404 int *ctl_sock, fd, maxfd = -1, nfds, i; 405 fd_set defreadfds, readfds; 406 pid_t pid; 407 struct pidfh *pfh; 408 409 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) { 410 if (errno == EEXIST) { 411 syslog(LOG_ERR, "%s already running, pid %d", 412 getprogname(), (int)pid); 413 exit(1); 414 } 415 syslog(LOG_WARNING, "pidfile_open: %m"); 416 } 417 418 /* 419 * Detach from parent. 420 */ 421 if (daemon(1, 1) < 0) { 422 syslog(LOG_ERR, "failed to become a daemon"); 423 exit(1); 424 } 425 426 if (pfh != NULL && pidfile_write(pfh) == -1) 427 syslog(LOG_WARNING, "pidfile_write: %m"); 428 429 sa.sa_handler = reapchild; 430 sigaction(SIGCHLD, &sa, NULL); 431 432 #ifdef VIRTUAL_HOSTING 433 inithosts(family); 434 #endif 435 436 /* 437 * Open a socket, bind it to the FTP port, and start 438 * listening. 439 */ 440 ctl_sock = socksetup(family, bindname, bindport); 441 if (ctl_sock == NULL) 442 exit(1); 443 444 FD_ZERO(&defreadfds); 445 for (i = 1; i <= *ctl_sock; i++) { 446 FD_SET(ctl_sock[i], &defreadfds); 447 if (listen(ctl_sock[i], 32) < 0) { 448 syslog(LOG_ERR, "control listen: %m"); 449 exit(1); 450 } 451 if (maxfd < ctl_sock[i]) 452 maxfd = ctl_sock[i]; 453 } 454 455 /* 456 * Loop forever accepting connection requests and forking off 457 * children to handle them. 458 */ 459 while (1) { 460 FD_COPY(&defreadfds, &readfds); 461 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 462 if (nfds <= 0) { 463 if (nfds < 0 && errno != EINTR) 464 syslog(LOG_WARNING, "select: %m"); 465 continue; 466 } 467 468 pid = -1; 469 for (i = 1; i <= *ctl_sock; i++) 470 if (FD_ISSET(ctl_sock[i], &readfds)) { 471 addrlen = sizeof(his_addr); 472 fd = accept(ctl_sock[i], 473 (struct sockaddr *)&his_addr, 474 &addrlen); 475 if (fd == -1) { 476 syslog(LOG_WARNING, 477 "accept: %m"); 478 continue; 479 } 480 switch (pid = fork()) { 481 case 0: 482 /* child */ 483 dup2(fd, 0); 484 dup2(fd, 1); 485 close(fd); 486 for (i = 1; i <= *ctl_sock; i++) 487 close(ctl_sock[i]); 488 if (pfh != NULL) 489 pidfile_close(pfh); 490 goto gotchild; 491 case -1: 492 syslog(LOG_WARNING, "fork: %m"); 493 /* FALLTHROUGH */ 494 default: 495 close(fd); 496 } 497 } 498 } 499 } else { 500 addrlen = sizeof(his_addr); 501 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 502 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 503 exit(1); 504 } 505 506 #ifdef VIRTUAL_HOSTING 507 if (his_addr.su_family == AF_INET6 && 508 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 509 family = AF_INET; 510 else 511 family = his_addr.su_family; 512 inithosts(family); 513 #endif 514 } 515 516 gotchild: 517 sa.sa_handler = SIG_DFL; 518 sigaction(SIGCHLD, &sa, NULL); 519 520 sa.sa_handler = sigurg; 521 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 522 sigaction(SIGURG, &sa, NULL); 523 524 sigfillset(&sa.sa_mask); /* block all signals in handler */ 525 sa.sa_flags = SA_RESTART; 526 sa.sa_handler = sigquit; 527 sigaction(SIGHUP, &sa, NULL); 528 sigaction(SIGINT, &sa, NULL); 529 sigaction(SIGQUIT, &sa, NULL); 530 sigaction(SIGTERM, &sa, NULL); 531 532 sa.sa_handler = lostconn; 533 sigaction(SIGPIPE, &sa, NULL); 534 535 addrlen = sizeof(ctrl_addr); 536 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 537 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 538 exit(1); 539 } 540 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 541 #ifdef VIRTUAL_HOSTING 542 /* select our identity from virtual host table */ 543 selecthost(&ctrl_addr); 544 #endif 545 #ifdef IP_TOS 546 if (ctrl_addr.su_family == AF_INET) 547 { 548 tos = IPTOS_LOWDELAY; 549 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 550 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 551 } 552 #endif 553 /* 554 * Disable Nagle on the control channel so that we don't have to wait 555 * for peer's ACK before issuing our next reply. 556 */ 557 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 558 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 559 560 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 561 562 /* set this here so klogin can use it... */ 563 snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 564 565 /* Try to handle urgent data inline */ 566 #ifdef SO_OOBINLINE 567 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 568 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 569 #endif 570 571 #ifdef F_SETOWN 572 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 573 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 574 #endif 575 dolog((struct sockaddr *)&his_addr); 576 /* 577 * Set up default state 578 */ 579 data = -1; 580 type = TYPE_A; 581 form = FORM_N; 582 stru = STRU_F; 583 mode = MODE_S; 584 tmpline[0] = '\0'; 585 586 /* If logins are disabled, print out the message. */ 587 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 588 while (fgets(line, sizeof(line), fd) != NULL) { 589 if ((cp = strchr(line, '\n')) != NULL) 590 *cp = '\0'; 591 lreply(530, "%s", line); 592 } 593 fflush(stdout); 594 fclose(fd); 595 reply(530, "System not available."); 596 exit(0); 597 } 598 #ifdef VIRTUAL_HOSTING 599 fd = fopen(thishost->welcome, "r"); 600 #else 601 fd = fopen(_PATH_FTPWELCOME, "r"); 602 #endif 603 if (fd != NULL) { 604 while (fgets(line, sizeof(line), fd) != NULL) { 605 if ((cp = strchr(line, '\n')) != NULL) 606 *cp = '\0'; 607 lreply(220, "%s", line); 608 } 609 fflush(stdout); 610 fclose(fd); 611 /* reply(220,) must follow */ 612 } 613 #ifndef VIRTUAL_HOSTING 614 if (hostname == NULL) { 615 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 616 fatalerror("Ran out of memory."); 617 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 618 hostname[0] = '\0'; 619 hostname[MAXHOSTNAMELEN - 1] = '\0'; 620 } 621 #endif 622 if (hostinfo) 623 reply(220, "%s FTP server (%s) ready.", hostname, version); 624 else 625 reply(220, "FTP server ready."); 626 for (;;) 627 yyparse(); 628 /* NOTREACHED */ 629 } 630 631 static void 632 lostconn(int signo) 633 { 634 635 if (ftpdebug) 636 syslog(LOG_DEBUG, "lost connection"); 637 dologout(1); 638 } 639 640 static void 641 sigquit(int signo) 642 { 643 644 syslog(LOG_ERR, "got signal %d", signo); 645 dologout(1); 646 } 647 648 #ifdef VIRTUAL_HOSTING 649 /* 650 * read in virtual host tables (if they exist) 651 */ 652 653 static void 654 inithosts(int family) 655 { 656 int insert; 657 size_t len; 658 FILE *fp; 659 char *cp, *mp, *line; 660 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 661 struct ftphost *hrp, *lhrp; 662 struct addrinfo hints, *res, *ai; 663 664 /* 665 * Fill in the default host information 666 */ 667 if (hostname == NULL) { 668 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 669 fatalerror("Ran out of memory."); 670 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 671 hostname[0] = '\0'; 672 hostname[MAXHOSTNAMELEN - 1] = '\0'; 673 } 674 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 675 fatalerror("Ran out of memory."); 676 hrp->hostname = hostname; 677 hrp->hostinfo = NULL; 678 679 memset(&hints, 0, sizeof(hints)); 680 hints.ai_flags = AI_PASSIVE; 681 hints.ai_family = family; 682 hints.ai_socktype = SOCK_STREAM; 683 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 684 hrp->hostinfo = res; 685 hrp->statfile = _PATH_FTPDSTATFILE; 686 hrp->welcome = _PATH_FTPWELCOME; 687 hrp->loginmsg = _PATH_FTPLOGINMESG; 688 hrp->anonuser = "ftp"; 689 hrp->next = NULL; 690 thishost = firsthost = lhrp = hrp; 691 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 692 int addrsize, gothost; 693 void *addr; 694 struct hostent *hp; 695 696 while ((line = fgetln(fp, &len)) != NULL) { 697 int i, hp_error; 698 699 /* skip comments */ 700 if (line[0] == '#') 701 continue; 702 if (line[len - 1] == '\n') { 703 line[len - 1] = '\0'; 704 mp = NULL; 705 } else { 706 if ((mp = malloc(len + 1)) == NULL) 707 fatalerror("Ran out of memory."); 708 memcpy(mp, line, len); 709 mp[len] = '\0'; 710 line = mp; 711 } 712 cp = strtok(line, " \t"); 713 /* skip empty lines */ 714 if (cp == NULL) 715 goto nextline; 716 vhost = cp; 717 718 /* set defaults */ 719 anonuser = "ftp"; 720 statfile = _PATH_FTPDSTATFILE; 721 welcome = _PATH_FTPWELCOME; 722 loginmsg = _PATH_FTPLOGINMESG; 723 724 /* 725 * Preparse the line so we can use its info 726 * for all the addresses associated with 727 * the virtual host name. 728 * Field 0, the virtual host name, is special: 729 * it's already parsed off and will be strdup'ed 730 * later, after we know its canonical form. 731 */ 732 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 733 if (*cp != '-' && (cp = strdup(cp))) 734 switch (i) { 735 case 1: /* anon user permissions */ 736 anonuser = cp; 737 break; 738 case 2: /* statistics file */ 739 statfile = cp; 740 break; 741 case 3: /* welcome message */ 742 welcome = cp; 743 break; 744 case 4: /* login message */ 745 loginmsg = cp; 746 break; 747 default: /* programming error */ 748 abort(); 749 /* NOTREACHED */ 750 } 751 752 hints.ai_flags = AI_PASSIVE; 753 hints.ai_family = family; 754 hints.ai_socktype = SOCK_STREAM; 755 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 756 goto nextline; 757 for (ai = res; ai != NULL && ai->ai_addr != NULL; 758 ai = ai->ai_next) { 759 760 gothost = 0; 761 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 762 struct addrinfo *hi; 763 764 for (hi = hrp->hostinfo; hi != NULL; 765 hi = hi->ai_next) 766 if (hi->ai_addrlen == ai->ai_addrlen && 767 memcmp(hi->ai_addr, 768 ai->ai_addr, 769 ai->ai_addr->sa_len) == 0) { 770 gothost++; 771 break; 772 } 773 if (gothost) 774 break; 775 } 776 if (hrp == NULL) { 777 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 778 goto nextline; 779 hrp->hostname = NULL; 780 insert = 1; 781 } else { 782 if (hrp->hostinfo && hrp->hostinfo != res) 783 freeaddrinfo(hrp->hostinfo); 784 insert = 0; /* host already in the chain */ 785 } 786 hrp->hostinfo = res; 787 788 /* 789 * determine hostname to use. 790 * force defined name if there is a valid alias 791 * otherwise fallback to primary hostname 792 */ 793 /* XXX: getaddrinfo() can't do alias check */ 794 switch(hrp->hostinfo->ai_family) { 795 case AF_INET: 796 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 797 addrsize = sizeof(struct in_addr); 798 break; 799 case AF_INET6: 800 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 801 addrsize = sizeof(struct in6_addr); 802 break; 803 default: 804 /* should not reach here */ 805 freeaddrinfo(hrp->hostinfo); 806 if (insert) 807 free(hrp); /*not in chain, can free*/ 808 else 809 hrp->hostinfo = NULL; /*mark as blank*/ 810 goto nextline; 811 /* NOTREACHED */ 812 } 813 if ((hp = getipnodebyaddr(addr, addrsize, 814 hrp->hostinfo->ai_family, 815 &hp_error)) != NULL) { 816 if (strcmp(vhost, hp->h_name) != 0) { 817 if (hp->h_aliases == NULL) 818 vhost = hp->h_name; 819 else { 820 i = 0; 821 while (hp->h_aliases[i] && 822 strcmp(vhost, hp->h_aliases[i]) != 0) 823 ++i; 824 if (hp->h_aliases[i] == NULL) 825 vhost = hp->h_name; 826 } 827 } 828 } 829 if (hrp->hostname && 830 strcmp(hrp->hostname, vhost) != 0) { 831 free(hrp->hostname); 832 hrp->hostname = NULL; 833 } 834 if (hrp->hostname == NULL && 835 (hrp->hostname = strdup(vhost)) == NULL) { 836 freeaddrinfo(hrp->hostinfo); 837 hrp->hostinfo = NULL; /* mark as blank */ 838 if (hp) 839 freehostent(hp); 840 goto nextline; 841 } 842 hrp->anonuser = anonuser; 843 hrp->statfile = statfile; 844 hrp->welcome = welcome; 845 hrp->loginmsg = loginmsg; 846 if (insert) { 847 hrp->next = NULL; 848 lhrp->next = hrp; 849 lhrp = hrp; 850 } 851 if (hp) 852 freehostent(hp); 853 } 854 nextline: 855 if (mp) 856 free(mp); 857 } 858 fclose(fp); 859 } 860 } 861 862 static void 863 selecthost(union sockunion *su) 864 { 865 struct ftphost *hrp; 866 u_int16_t port; 867 #ifdef INET6 868 struct in6_addr *mapped_in6 = NULL; 869 #endif 870 struct addrinfo *hi; 871 872 #ifdef INET6 873 /* 874 * XXX IPv4 mapped IPv6 addr consideraton, 875 * specified in rfc2373. 876 */ 877 if (su->su_family == AF_INET6 && 878 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 879 mapped_in6 = &su->su_sin6.sin6_addr; 880 #endif 881 882 hrp = thishost = firsthost; /* default */ 883 port = su->su_port; 884 su->su_port = 0; 885 while (hrp != NULL) { 886 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 887 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 888 thishost = hrp; 889 goto found; 890 } 891 #ifdef INET6 892 /* XXX IPv4 mapped IPv6 addr consideraton */ 893 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 894 (memcmp(&mapped_in6->s6_addr[12], 895 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 896 sizeof(struct in_addr)) == 0)) { 897 thishost = hrp; 898 goto found; 899 } 900 #endif 901 } 902 hrp = hrp->next; 903 } 904 found: 905 su->su_port = port; 906 /* setup static variables as appropriate */ 907 hostname = thishost->hostname; 908 ftpuser = thishost->anonuser; 909 } 910 #endif 911 912 /* 913 * Helper function for sgetpwnam(). 914 */ 915 static char * 916 sgetsave(char *s) 917 { 918 char *new = malloc(strlen(s) + 1); 919 920 if (new == NULL) { 921 reply(421, "Ran out of memory."); 922 dologout(1); 923 /* NOTREACHED */ 924 } 925 strcpy(new, s); 926 return (new); 927 } 928 929 /* 930 * Save the result of a getpwnam. Used for USER command, since 931 * the data returned must not be clobbered by any other command 932 * (e.g., globbing). 933 * NB: The data returned by sgetpwnam() will remain valid until 934 * the next call to this function. Its difference from getpwnam() 935 * is that sgetpwnam() is known to be called from ftpd code only. 936 */ 937 static struct passwd * 938 sgetpwnam(char *name) 939 { 940 static struct passwd save; 941 struct passwd *p; 942 943 if ((p = getpwnam(name)) == NULL) 944 return (p); 945 if (save.pw_name) { 946 free(save.pw_name); 947 free(save.pw_passwd); 948 free(save.pw_gecos); 949 free(save.pw_dir); 950 free(save.pw_shell); 951 } 952 save = *p; 953 save.pw_name = sgetsave(p->pw_name); 954 save.pw_passwd = sgetsave(p->pw_passwd); 955 save.pw_gecos = sgetsave(p->pw_gecos); 956 save.pw_dir = sgetsave(p->pw_dir); 957 save.pw_shell = sgetsave(p->pw_shell); 958 return (&save); 959 } 960 961 static int login_attempts; /* number of failed login attempts */ 962 static int askpasswd; /* had user command, ask for passwd */ 963 static char curname[MAXLOGNAME]; /* current USER name */ 964 965 /* 966 * USER command. 967 * Sets global passwd pointer pw if named account exists and is acceptable; 968 * sets askpasswd if a PASS command is expected. If logged in previously, 969 * need to reset state. If name is "ftp" or "anonymous", the name is not in 970 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 971 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 972 * requesting login privileges. Disallow anyone who does not have a standard 973 * shell as returned by getusershell(). Disallow anyone mentioned in the file 974 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 975 */ 976 void 977 user(char *name) 978 { 979 char *cp, *shell; 980 981 if (logged_in) { 982 if (guest) { 983 reply(530, "Can't change user from guest login."); 984 return; 985 } else if (dochroot) { 986 reply(530, "Can't change user from chroot user."); 987 return; 988 } 989 end_login(); 990 } 991 992 guest = 0; 993 #ifdef VIRTUAL_HOSTING 994 pw = sgetpwnam(thishost->anonuser); 995 #else 996 pw = sgetpwnam("ftp"); 997 #endif 998 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 999 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 1000 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 1001 reply(530, "User %s access denied.", name); 1002 else if (pw != NULL) { 1003 guest = 1; 1004 askpasswd = 1; 1005 reply(331, 1006 "Guest login ok, send your email address as password."); 1007 } else 1008 reply(530, "User %s unknown.", name); 1009 if (!askpasswd && logging) 1010 syslog(LOG_NOTICE, 1011 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1012 return; 1013 } 1014 if (anon_only != 0) { 1015 reply(530, "Sorry, only anonymous ftp allowed."); 1016 return; 1017 } 1018 1019 if ((pw = sgetpwnam(name))) { 1020 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1021 shell = _PATH_BSHELL; 1022 setusershell(); 1023 while ((cp = getusershell()) != NULL) 1024 if (strcmp(cp, shell) == 0) 1025 break; 1026 endusershell(); 1027 1028 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1029 reply(530, "User %s access denied.", name); 1030 if (logging) 1031 syslog(LOG_NOTICE, 1032 "FTP LOGIN REFUSED FROM %s, %s", 1033 remotehost, name); 1034 pw = NULL; 1035 return; 1036 } 1037 } 1038 if (logging) 1039 strncpy(curname, name, sizeof(curname)-1); 1040 1041 pwok = 0; 1042 #ifdef USE_PAM 1043 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1044 #endif 1045 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1046 pwok = (pw != NULL) && 1047 opieaccessfile(remotehost) && 1048 opiealways(pw->pw_dir); 1049 reply(331, "Response to %s %s for %s.", 1050 opieprompt, pwok ? "requested" : "required", name); 1051 } else { 1052 pwok = 1; 1053 reply(331, "Password required for %s.", name); 1054 } 1055 askpasswd = 1; 1056 /* 1057 * Delay before reading passwd after first failed 1058 * attempt to slow down passwd-guessing programs. 1059 */ 1060 if (login_attempts) 1061 sleep(login_attempts); 1062 } 1063 1064 /* 1065 * Check if a user is in the file "fname", 1066 * return a pointer to a malloc'd string with the rest 1067 * of the matching line in "residue" if not NULL. 1068 */ 1069 static int 1070 checkuser(char *fname, char *name, int pwset, char **residue) 1071 { 1072 FILE *fd; 1073 int found = 0; 1074 size_t len; 1075 char *line, *mp, *p; 1076 1077 if ((fd = fopen(fname, "r")) != NULL) { 1078 while (!found && (line = fgetln(fd, &len)) != NULL) { 1079 /* skip comments */ 1080 if (line[0] == '#') 1081 continue; 1082 if (line[len - 1] == '\n') { 1083 line[len - 1] = '\0'; 1084 mp = NULL; 1085 } else { 1086 if ((mp = malloc(len + 1)) == NULL) 1087 fatalerror("Ran out of memory."); 1088 memcpy(mp, line, len); 1089 mp[len] = '\0'; 1090 line = mp; 1091 } 1092 /* avoid possible leading and trailing whitespace */ 1093 p = strtok(line, " \t"); 1094 /* skip empty lines */ 1095 if (p == NULL) 1096 goto nextline; 1097 /* 1098 * if first chr is '@', check group membership 1099 */ 1100 if (p[0] == '@') { 1101 int i = 0; 1102 struct group *grp; 1103 1104 if (p[1] == '\0') /* single @ matches anyone */ 1105 found = 1; 1106 else { 1107 if ((grp = getgrnam(p+1)) == NULL) 1108 goto nextline; 1109 /* 1110 * Check user's default group 1111 */ 1112 if (pwset && grp->gr_gid == pw->pw_gid) 1113 found = 1; 1114 /* 1115 * Check supplementary groups 1116 */ 1117 while (!found && grp->gr_mem[i]) 1118 found = strcmp(name, 1119 grp->gr_mem[i++]) 1120 == 0; 1121 } 1122 } 1123 /* 1124 * Otherwise, just check for username match 1125 */ 1126 else 1127 found = strcmp(p, name) == 0; 1128 /* 1129 * Save the rest of line to "residue" if matched 1130 */ 1131 if (found && residue) { 1132 if ((p = strtok(NULL, "")) != NULL) 1133 p += strspn(p, " \t"); 1134 if (p && *p) { 1135 if ((*residue = strdup(p)) == NULL) 1136 fatalerror("Ran out of memory."); 1137 } else 1138 *residue = NULL; 1139 } 1140 nextline: 1141 if (mp) 1142 free(mp); 1143 } 1144 fclose(fd); 1145 } 1146 return (found); 1147 } 1148 1149 /* 1150 * Terminate login as previous user, if any, resetting state; 1151 * used when USER command is given or login fails. 1152 */ 1153 static void 1154 end_login(void) 1155 { 1156 #ifdef USE_PAM 1157 int e; 1158 #endif 1159 1160 seteuid(0); 1161 if (logged_in && dowtmp) 1162 ftpd_logwtmp(ttyline, "", NULL); 1163 pw = NULL; 1164 #ifdef LOGIN_CAP 1165 /* XXX Missing LOGIN_SETMAC */ 1166 setusercontext(NULL, getpwuid(0), 0, 1167 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1168 #endif 1169 #ifdef USE_PAM 1170 if (pamh) { 1171 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1172 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1173 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1174 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1175 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1176 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1177 pamh = NULL; 1178 } 1179 #endif 1180 logged_in = 0; 1181 guest = 0; 1182 dochroot = 0; 1183 } 1184 1185 #ifdef USE_PAM 1186 1187 /* 1188 * the following code is stolen from imap-uw PAM authentication module and 1189 * login.c 1190 */ 1191 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1192 1193 struct cred_t { 1194 const char *uname; /* user name */ 1195 const char *pass; /* password */ 1196 }; 1197 typedef struct cred_t cred_t; 1198 1199 static int 1200 auth_conv(int num_msg, const struct pam_message **msg, 1201 struct pam_response **resp, void *appdata) 1202 { 1203 int i; 1204 cred_t *cred = (cred_t *) appdata; 1205 struct pam_response *reply; 1206 1207 reply = calloc(num_msg, sizeof *reply); 1208 if (reply == NULL) 1209 return PAM_BUF_ERR; 1210 1211 for (i = 0; i < num_msg; i++) { 1212 switch (msg[i]->msg_style) { 1213 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1214 reply[i].resp_retcode = PAM_SUCCESS; 1215 reply[i].resp = COPY_STRING(cred->uname); 1216 /* PAM frees resp. */ 1217 break; 1218 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1219 reply[i].resp_retcode = PAM_SUCCESS; 1220 reply[i].resp = COPY_STRING(cred->pass); 1221 /* PAM frees resp. */ 1222 break; 1223 case PAM_TEXT_INFO: 1224 case PAM_ERROR_MSG: 1225 reply[i].resp_retcode = PAM_SUCCESS; 1226 reply[i].resp = NULL; 1227 break; 1228 default: /* unknown message style */ 1229 free(reply); 1230 return PAM_CONV_ERR; 1231 } 1232 } 1233 1234 *resp = reply; 1235 return PAM_SUCCESS; 1236 } 1237 1238 /* 1239 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1240 * authenticated, or 1 if not authenticated. If some sort of PAM system 1241 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1242 * function returns -1. This can be used as an indication that we should 1243 * fall back to a different authentication mechanism. 1244 */ 1245 static int 1246 auth_pam(struct passwd **ppw, const char *pass) 1247 { 1248 const char *tmpl_user; 1249 const void *item; 1250 int rval; 1251 int e; 1252 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1253 struct pam_conv conv = { &auth_conv, &auth_cred }; 1254 1255 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1256 if (e != PAM_SUCCESS) { 1257 /* 1258 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1259 * if context creation has failed in the first place. 1260 */ 1261 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1262 return -1; 1263 } 1264 1265 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1266 if (e != PAM_SUCCESS) { 1267 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1268 pam_strerror(pamh, e)); 1269 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1270 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1271 } 1272 pamh = NULL; 1273 return -1; 1274 } 1275 1276 e = pam_authenticate(pamh, 0); 1277 switch (e) { 1278 case PAM_SUCCESS: 1279 /* 1280 * With PAM we support the concept of a "template" 1281 * user. The user enters a login name which is 1282 * authenticated by PAM, usually via a remote service 1283 * such as RADIUS or TACACS+. If authentication 1284 * succeeds, a different but related "template" name 1285 * is used for setting the credentials, shell, and 1286 * home directory. The name the user enters need only 1287 * exist on the remote authentication server, but the 1288 * template name must be present in the local password 1289 * database. 1290 * 1291 * This is supported by two various mechanisms in the 1292 * individual modules. However, from the application's 1293 * point of view, the template user is always passed 1294 * back as a changed value of the PAM_USER item. 1295 */ 1296 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1297 PAM_SUCCESS) { 1298 tmpl_user = (const char *) item; 1299 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1300 *ppw = getpwnam(tmpl_user); 1301 } else 1302 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1303 pam_strerror(pamh, e)); 1304 rval = 0; 1305 break; 1306 1307 case PAM_AUTH_ERR: 1308 case PAM_USER_UNKNOWN: 1309 case PAM_MAXTRIES: 1310 rval = 1; 1311 break; 1312 1313 default: 1314 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1315 rval = -1; 1316 break; 1317 } 1318 1319 if (rval == 0) { 1320 e = pam_acct_mgmt(pamh, 0); 1321 if (e != PAM_SUCCESS) { 1322 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1323 pam_strerror(pamh, e)); 1324 rval = 1; 1325 } 1326 } 1327 1328 if (rval != 0) { 1329 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1330 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1331 } 1332 pamh = NULL; 1333 } 1334 return rval; 1335 } 1336 1337 #endif /* USE_PAM */ 1338 1339 void 1340 pass(char *passwd) 1341 { 1342 int rval; 1343 FILE *fd; 1344 #ifdef LOGIN_CAP 1345 login_cap_t *lc = NULL; 1346 #endif 1347 #ifdef USE_PAM 1348 int e; 1349 #endif 1350 char *residue = NULL; 1351 char *xpasswd; 1352 1353 if (logged_in || askpasswd == 0) { 1354 reply(503, "Login with USER first."); 1355 return; 1356 } 1357 askpasswd = 0; 1358 if (!guest) { /* "ftp" is only account allowed no password */ 1359 if (pw == NULL) { 1360 rval = 1; /* failure below */ 1361 goto skip; 1362 } 1363 #ifdef USE_PAM 1364 rval = auth_pam(&pw, passwd); 1365 if (rval >= 0) { 1366 opieunlock(); 1367 goto skip; 1368 } 1369 #endif 1370 if (opieverify(&opiedata, passwd) == 0) 1371 xpasswd = pw->pw_passwd; 1372 else if (pwok) { 1373 xpasswd = crypt(passwd, pw->pw_passwd); 1374 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1375 xpasswd = ":"; 1376 } else { 1377 rval = 1; 1378 goto skip; 1379 } 1380 rval = strcmp(pw->pw_passwd, xpasswd); 1381 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1382 rval = 1; /* failure */ 1383 skip: 1384 /* 1385 * If rval == 1, the user failed the authentication check 1386 * above. If rval == 0, either PAM or local authentication 1387 * succeeded. 1388 */ 1389 if (rval) { 1390 reply(530, "Login incorrect."); 1391 if (logging) { 1392 syslog(LOG_NOTICE, 1393 "FTP LOGIN FAILED FROM %s", 1394 remotehost); 1395 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1396 "FTP LOGIN FAILED FROM %s, %s", 1397 remotehost, curname); 1398 } 1399 pw = NULL; 1400 if (login_attempts++ >= 5) { 1401 syslog(LOG_NOTICE, 1402 "repeated login failures from %s", 1403 remotehost); 1404 exit(0); 1405 } 1406 return; 1407 } 1408 } 1409 login_attempts = 0; /* this time successful */ 1410 if (setegid(pw->pw_gid) < 0) { 1411 reply(550, "Can't set gid."); 1412 return; 1413 } 1414 /* May be overridden by login.conf */ 1415 umask(defumask); 1416 #ifdef LOGIN_CAP 1417 if ((lc = login_getpwclass(pw)) != NULL) { 1418 char remote_ip[NI_MAXHOST]; 1419 1420 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1421 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1422 NI_NUMERICHOST)) 1423 *remote_ip = 0; 1424 remote_ip[sizeof(remote_ip) - 1] = 0; 1425 if (!auth_hostok(lc, remotehost, remote_ip)) { 1426 syslog(LOG_INFO|LOG_AUTH, 1427 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1428 pw->pw_name); 1429 reply(530, "Permission denied."); 1430 pw = NULL; 1431 return; 1432 } 1433 if (!auth_timeok(lc, time(NULL))) { 1434 reply(530, "Login not available right now."); 1435 pw = NULL; 1436 return; 1437 } 1438 } 1439 /* XXX Missing LOGIN_SETMAC */ 1440 setusercontext(lc, pw, 0, 1441 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1442 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1443 #else 1444 setlogin(pw->pw_name); 1445 initgroups(pw->pw_name, pw->pw_gid); 1446 #endif 1447 1448 #ifdef USE_PAM 1449 if (pamh) { 1450 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1451 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1452 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1453 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1454 } 1455 } 1456 #endif 1457 1458 /* open wtmp before chroot */ 1459 if (dowtmp) 1460 ftpd_logwtmp(ttyline, pw->pw_name, 1461 (struct sockaddr *)&his_addr); 1462 logged_in = 1; 1463 1464 if (guest && stats && statfd < 0) 1465 #ifdef VIRTUAL_HOSTING 1466 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1467 #else 1468 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1469 #endif 1470 if (statfd < 0) 1471 stats = 0; 1472 1473 dochroot = 1474 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1475 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1476 || login_getcapbool(lc, "ftp-chroot", 0) 1477 #endif 1478 ; 1479 chrootdir = NULL; 1480 /* 1481 * For a chrooted local user, 1482 * a) see whether ftpchroot(5) specifies a chroot directory, 1483 * b) extract the directory pathname from the line, 1484 * c) expand it to the absolute pathname if necessary. 1485 */ 1486 if (dochroot && residue && 1487 (chrootdir = strtok(residue, " \t")) != NULL) { 1488 if (chrootdir[0] != '/') 1489 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1490 else 1491 chrootdir = strdup(chrootdir); /* make it permanent */ 1492 if (chrootdir == NULL) 1493 fatalerror("Ran out of memory."); 1494 } 1495 if (guest || dochroot) { 1496 /* 1497 * If no chroot directory set yet, use the login directory. 1498 * Copy it so it can be modified while pw->pw_dir stays intact. 1499 */ 1500 if (chrootdir == NULL && 1501 (chrootdir = strdup(pw->pw_dir)) == NULL) 1502 fatalerror("Ran out of memory."); 1503 /* 1504 * Check for the "/chroot/./home" syntax, 1505 * separate the chroot and home directory pathnames. 1506 */ 1507 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1508 *(homedir++) = '\0'; /* wipe '/' */ 1509 homedir++; /* skip '.' */ 1510 } else { 1511 /* 1512 * We MUST do a chdir() after the chroot. Otherwise 1513 * the old current directory will be accessible as "." 1514 * outside the new root! 1515 */ 1516 homedir = "/"; 1517 } 1518 /* 1519 * Finally, do chroot() 1520 */ 1521 if (chroot(chrootdir) < 0) { 1522 reply(550, "Can't change root."); 1523 goto bad; 1524 } 1525 } else /* real user w/o chroot */ 1526 homedir = pw->pw_dir; 1527 /* 1528 * Set euid *before* doing chdir() so 1529 * a) the user won't be carried to a directory that he couldn't reach 1530 * on his own due to no permission to upper path components, 1531 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1532 * (uid 0 has no root power over NFS if not mapped explicitly.) 1533 */ 1534 if (seteuid(pw->pw_uid) < 0) { 1535 reply(550, "Can't set uid."); 1536 goto bad; 1537 } 1538 if (chdir(homedir) < 0) { 1539 if (guest || dochroot) { 1540 reply(550, "Can't change to base directory."); 1541 goto bad; 1542 } else { 1543 if (chdir("/") < 0) { 1544 reply(550, "Root is inaccessible."); 1545 goto bad; 1546 } 1547 lreply(230, "No directory! Logging in with home=/."); 1548 } 1549 } 1550 1551 /* 1552 * Display a login message, if it exists. 1553 * N.B. reply(230,) must follow the message. 1554 */ 1555 #ifdef VIRTUAL_HOSTING 1556 fd = fopen(thishost->loginmsg, "r"); 1557 #else 1558 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1559 #endif 1560 if (fd != NULL) { 1561 char *cp, line[LINE_MAX]; 1562 1563 while (fgets(line, sizeof(line), fd) != NULL) { 1564 if ((cp = strchr(line, '\n')) != NULL) 1565 *cp = '\0'; 1566 lreply(230, "%s", line); 1567 } 1568 fflush(stdout); 1569 fclose(fd); 1570 } 1571 if (guest) { 1572 if (ident != NULL) 1573 free(ident); 1574 ident = strdup(passwd); 1575 if (ident == NULL) 1576 fatalerror("Ran out of memory."); 1577 1578 reply(230, "Guest login ok, access restrictions apply."); 1579 #ifdef SETPROCTITLE 1580 #ifdef VIRTUAL_HOSTING 1581 if (thishost != firsthost) 1582 snprintf(proctitle, sizeof(proctitle), 1583 "%s: anonymous(%s)/%s", remotehost, hostname, 1584 passwd); 1585 else 1586 #endif 1587 snprintf(proctitle, sizeof(proctitle), 1588 "%s: anonymous/%s", remotehost, passwd); 1589 setproctitle("%s", proctitle); 1590 #endif /* SETPROCTITLE */ 1591 if (logging) 1592 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1593 remotehost, passwd); 1594 } else { 1595 if (dochroot) 1596 reply(230, "User %s logged in, " 1597 "access restrictions apply.", pw->pw_name); 1598 else 1599 reply(230, "User %s logged in.", pw->pw_name); 1600 1601 #ifdef SETPROCTITLE 1602 snprintf(proctitle, sizeof(proctitle), 1603 "%s: user/%s", remotehost, pw->pw_name); 1604 setproctitle("%s", proctitle); 1605 #endif /* SETPROCTITLE */ 1606 if (logging) 1607 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1608 remotehost, pw->pw_name); 1609 } 1610 if (logging && (guest || dochroot)) 1611 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1612 #ifdef LOGIN_CAP 1613 login_close(lc); 1614 #endif 1615 if (residue) 1616 free(residue); 1617 return; 1618 bad: 1619 /* Forget all about it... */ 1620 #ifdef LOGIN_CAP 1621 login_close(lc); 1622 #endif 1623 if (residue) 1624 free(residue); 1625 end_login(); 1626 } 1627 1628 void 1629 retrieve(char *cmd, char *name) 1630 { 1631 FILE *fin, *dout; 1632 struct stat st; 1633 int (*closefunc)(FILE *); 1634 time_t start; 1635 1636 if (cmd == NULL) { 1637 fin = fopen(name, "r"), closefunc = fclose; 1638 st.st_size = 0; 1639 } else { 1640 char line[BUFSIZ]; 1641 1642 snprintf(line, sizeof(line), cmd, name), name = line; 1643 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1644 st.st_size = -1; 1645 st.st_blksize = BUFSIZ; 1646 } 1647 if (fin == NULL) { 1648 if (errno != 0) { 1649 perror_reply(550, name); 1650 if (cmd == NULL) { 1651 LOGCMD("get", name); 1652 } 1653 } 1654 return; 1655 } 1656 byte_count = -1; 1657 if (cmd == NULL) { 1658 if (fstat(fileno(fin), &st) < 0) { 1659 perror_reply(550, name); 1660 goto done; 1661 } 1662 if (!S_ISREG(st.st_mode)) { 1663 /* 1664 * Never sending a raw directory is a workaround 1665 * for buggy clients that will attempt to RETR 1666 * a directory before listing it, e.g., Mozilla. 1667 * Preventing a guest from getting irregular files 1668 * is a simple security measure. 1669 */ 1670 if (S_ISDIR(st.st_mode) || guest) { 1671 reply(550, "%s: not a plain file.", name); 1672 goto done; 1673 } 1674 st.st_size = -1; 1675 /* st.st_blksize is set for all descriptor types */ 1676 } 1677 } 1678 if (restart_point) { 1679 if (type == TYPE_A) { 1680 off_t i, n; 1681 int c; 1682 1683 n = restart_point; 1684 i = 0; 1685 while (i++ < n) { 1686 if ((c=getc(fin)) == EOF) { 1687 perror_reply(550, name); 1688 goto done; 1689 } 1690 if (c == '\n') 1691 i++; 1692 } 1693 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1694 perror_reply(550, name); 1695 goto done; 1696 } 1697 } 1698 dout = dataconn(name, st.st_size, "w"); 1699 if (dout == NULL) 1700 goto done; 1701 time(&start); 1702 send_data(fin, dout, st.st_blksize, st.st_size, 1703 restart_point == 0 && cmd == NULL && S_ISREG(st.st_mode)); 1704 if (cmd == NULL && guest && stats && byte_count > 0) 1705 logxfer(name, byte_count, start); 1706 fclose(dout); 1707 data = -1; 1708 pdata = -1; 1709 done: 1710 if (cmd == NULL) 1711 LOGBYTES("get", name, byte_count); 1712 (*closefunc)(fin); 1713 } 1714 1715 void 1716 store(char *name, char *mode, int unique) 1717 { 1718 int fd; 1719 FILE *fout, *din; 1720 int (*closefunc)(FILE *); 1721 1722 if (*mode == 'a') { /* APPE */ 1723 if (unique) { 1724 /* Programming error */ 1725 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1726 unique = 0; 1727 } 1728 if (guest && noguestmod) { 1729 reply(550, "Appending to existing file denied."); 1730 goto err; 1731 } 1732 restart_point = 0; /* not affected by preceding REST */ 1733 } 1734 if (unique) /* STOU overrides REST */ 1735 restart_point = 0; 1736 if (guest && noguestmod) { 1737 if (restart_point) { /* guest STOR w/REST */ 1738 reply(550, "Modifying existing file denied."); 1739 goto err; 1740 } else /* treat guest STOR as STOU */ 1741 unique = 1; 1742 } 1743 1744 if (restart_point) 1745 mode = "r+"; /* so ASCII manual seek can work */ 1746 if (unique) { 1747 if ((fd = guniquefd(name, &name)) < 0) 1748 goto err; 1749 fout = fdopen(fd, mode); 1750 } else 1751 fout = fopen(name, mode); 1752 closefunc = fclose; 1753 if (fout == NULL) { 1754 perror_reply(553, name); 1755 goto err; 1756 } 1757 byte_count = -1; 1758 if (restart_point) { 1759 if (type == TYPE_A) { 1760 off_t i, n; 1761 int c; 1762 1763 n = restart_point; 1764 i = 0; 1765 while (i++ < n) { 1766 if ((c=getc(fout)) == EOF) { 1767 perror_reply(550, name); 1768 goto done; 1769 } 1770 if (c == '\n') 1771 i++; 1772 } 1773 /* 1774 * We must do this seek to "current" position 1775 * because we are changing from reading to 1776 * writing. 1777 */ 1778 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1779 perror_reply(550, name); 1780 goto done; 1781 } 1782 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1783 perror_reply(550, name); 1784 goto done; 1785 } 1786 } 1787 din = dataconn(name, -1, "r"); 1788 if (din == NULL) 1789 goto done; 1790 if (receive_data(din, fout) == 0) { 1791 if (unique) 1792 reply(226, "Transfer complete (unique file name:%s).", 1793 name); 1794 else 1795 reply(226, "Transfer complete."); 1796 } 1797 fclose(din); 1798 data = -1; 1799 pdata = -1; 1800 done: 1801 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1802 (*closefunc)(fout); 1803 return; 1804 err: 1805 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1806 return; 1807 } 1808 1809 static FILE * 1810 getdatasock(char *mode) 1811 { 1812 int on = 1, s, t, tries; 1813 1814 if (data >= 0) 1815 return (fdopen(data, mode)); 1816 1817 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1818 if (s < 0) 1819 goto bad; 1820 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1821 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1822 /* anchor socket to avoid multi-homing problems */ 1823 data_source = ctrl_addr; 1824 data_source.su_port = htons(dataport); 1825 seteuid(0); 1826 for (tries = 1; ; tries++) { 1827 /* 1828 * We should loop here since it's possible that 1829 * another ftpd instance has passed this point and is 1830 * trying to open a data connection in active mode now. 1831 * Until the other connection is opened, we'll be getting 1832 * EADDRINUSE because no SOCK_STREAM sockets in the system 1833 * can share both local and remote addresses, localIP:20 1834 * and *:* in this case. 1835 */ 1836 if (bind(s, (struct sockaddr *)&data_source, 1837 data_source.su_len) >= 0) 1838 break; 1839 if (errno != EADDRINUSE || tries > 10) 1840 goto bad; 1841 sleep(tries); 1842 } 1843 seteuid(pw->pw_uid); 1844 #ifdef IP_TOS 1845 if (data_source.su_family == AF_INET) 1846 { 1847 on = IPTOS_THROUGHPUT; 1848 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1849 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1850 } 1851 #endif 1852 #ifdef TCP_NOPUSH 1853 /* 1854 * Turn off push flag to keep sender TCP from sending short packets 1855 * at the boundaries of each write(). 1856 */ 1857 on = 1; 1858 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1859 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1860 #endif 1861 return (fdopen(s, mode)); 1862 bad: 1863 /* Return the real value of errno (close may change it) */ 1864 t = errno; 1865 seteuid(pw->pw_uid); 1866 close(s); 1867 errno = t; 1868 return (NULL); 1869 } 1870 1871 static FILE * 1872 dataconn(char *name, off_t size, char *mode) 1873 { 1874 char sizebuf[32]; 1875 FILE *file; 1876 int retry = 0, tos, conerrno; 1877 1878 file_size = size; 1879 byte_count = 0; 1880 if (size != -1) 1881 snprintf(sizebuf, sizeof(sizebuf), 1882 " (%jd bytes)", (intmax_t)size); 1883 else 1884 *sizebuf = '\0'; 1885 if (pdata >= 0) { 1886 union sockunion from; 1887 socklen_t fromlen = ctrl_addr.su_len; 1888 int flags, s; 1889 struct timeval timeout; 1890 fd_set set; 1891 1892 FD_ZERO(&set); 1893 FD_SET(pdata, &set); 1894 1895 timeout.tv_usec = 0; 1896 timeout.tv_sec = 120; 1897 1898 /* 1899 * Granted a socket is in the blocking I/O mode, 1900 * accept() will block after a successful select() 1901 * if the selected connection dies in between. 1902 * Therefore set the non-blocking I/O flag here. 1903 */ 1904 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1905 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1906 goto pdata_err; 1907 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1908 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1909 goto pdata_err; 1910 close(pdata); 1911 pdata = s; 1912 /* 1913 * Unset the inherited non-blocking I/O flag 1914 * on the child socket so stdio can work on it. 1915 */ 1916 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1917 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1918 goto pdata_err; 1919 #ifdef IP_TOS 1920 if (from.su_family == AF_INET) 1921 { 1922 tos = IPTOS_THROUGHPUT; 1923 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1924 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1925 } 1926 #endif 1927 reply(150, "Opening %s mode data connection for '%s'%s.", 1928 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1929 return (fdopen(pdata, mode)); 1930 pdata_err: 1931 reply(425, "Can't open data connection."); 1932 close(pdata); 1933 pdata = -1; 1934 return (NULL); 1935 } 1936 if (data >= 0) { 1937 reply(125, "Using existing data connection for '%s'%s.", 1938 name, sizebuf); 1939 usedefault = 1; 1940 return (fdopen(data, mode)); 1941 } 1942 if (usedefault) 1943 data_dest = his_addr; 1944 usedefault = 1; 1945 do { 1946 file = getdatasock(mode); 1947 if (file == NULL) { 1948 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1949 1950 if (getnameinfo((struct sockaddr *)&data_source, 1951 data_source.su_len, 1952 hostbuf, sizeof(hostbuf) - 1, 1953 portbuf, sizeof(portbuf) - 1, 1954 NI_NUMERICHOST|NI_NUMERICSERV)) 1955 *hostbuf = *portbuf = 0; 1956 hostbuf[sizeof(hostbuf) - 1] = 0; 1957 portbuf[sizeof(portbuf) - 1] = 0; 1958 reply(425, "Can't create data socket (%s,%s): %s.", 1959 hostbuf, portbuf, strerror(errno)); 1960 return (NULL); 1961 } 1962 data = fileno(file); 1963 conerrno = 0; 1964 if (connect(data, (struct sockaddr *)&data_dest, 1965 data_dest.su_len) == 0) 1966 break; 1967 conerrno = errno; 1968 fclose(file); 1969 data = -1; 1970 if (conerrno == EADDRINUSE) { 1971 sleep(swaitint); 1972 retry += swaitint; 1973 } else { 1974 break; 1975 } 1976 } while (retry <= swaitmax); 1977 if (conerrno != 0) { 1978 reply(425, "Can't build data connection: %s.", 1979 strerror(conerrno)); 1980 return (NULL); 1981 } 1982 reply(150, "Opening %s mode data connection for '%s'%s.", 1983 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1984 return (file); 1985 } 1986 1987 /* 1988 * A helper macro to avoid code duplication 1989 * in send_data() and receive_data(). 1990 * 1991 * XXX We have to block SIGURG during putc() because BSD stdio 1992 * is unable to restart interrupted write operations and hence 1993 * the entire buffer contents will be lost as soon as a write() 1994 * call indicates EINTR to stdio. 1995 */ 1996 #define FTPD_PUTC(ch, file, label) \ 1997 do { \ 1998 int ret; \ 1999 \ 2000 do { \ 2001 START_UNSAFE; \ 2002 ret = putc((ch), (file)); \ 2003 END_UNSAFE; \ 2004 CHECKOOB(return (-1)) \ 2005 else if (ferror(file)) \ 2006 goto label; \ 2007 clearerr(file); \ 2008 } while (ret == EOF); \ 2009 } while (0) 2010 2011 /* 2012 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2013 * encapsulation of the data subject to Mode, Structure, and Type. 2014 * 2015 * NB: Form isn't handled. 2016 */ 2017 static int 2018 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2019 { 2020 int c, cp, filefd, netfd; 2021 char *buf; 2022 2023 STARTXFER; 2024 2025 switch (type) { 2026 2027 case TYPE_A: 2028 cp = EOF; 2029 for (;;) { 2030 c = getc(instr); 2031 CHECKOOB(return (-1)) 2032 else if (c == EOF && ferror(instr)) 2033 goto file_err; 2034 if (c == EOF) { 2035 if (ferror(instr)) { /* resume after OOB */ 2036 clearerr(instr); 2037 continue; 2038 } 2039 if (feof(instr)) /* EOF */ 2040 break; 2041 syslog(LOG_ERR, "Internal: impossible condition" 2042 " on file after getc()"); 2043 goto file_err; 2044 } 2045 if (c == '\n' && cp != '\r') { 2046 FTPD_PUTC('\r', outstr, data_err); 2047 byte_count++; 2048 } 2049 FTPD_PUTC(c, outstr, data_err); 2050 byte_count++; 2051 cp = c; 2052 } 2053 #ifdef notyet /* BSD stdio isn't ready for that */ 2054 while (fflush(outstr) == EOF) { 2055 CHECKOOB(return (-1)) 2056 else 2057 goto data_err; 2058 clearerr(outstr); 2059 } 2060 ENDXFER; 2061 #else 2062 ENDXFER; 2063 if (fflush(outstr) == EOF) 2064 goto data_err; 2065 #endif 2066 reply(226, "Transfer complete."); 2067 return (0); 2068 2069 case TYPE_I: 2070 case TYPE_L: 2071 /* 2072 * isreg is only set if we are not doing restart and we 2073 * are sending a regular file 2074 */ 2075 netfd = fileno(outstr); 2076 filefd = fileno(instr); 2077 2078 if (isreg) { 2079 char *msg = "Transfer complete."; 2080 off_t cnt, offset; 2081 int err; 2082 2083 cnt = offset = 0; 2084 2085 while (filesize > 0) { 2086 err = sendfile(filefd, netfd, offset, 0, 2087 NULL, &cnt, 0); 2088 /* 2089 * Calculate byte_count before OOB processing. 2090 * It can be used in myoob() later. 2091 */ 2092 byte_count += cnt; 2093 offset += cnt; 2094 filesize -= cnt; 2095 CHECKOOB(return (-1)) 2096 else if (err == -1) { 2097 if (errno != EINTR && 2098 cnt == 0 && offset == 0) 2099 goto oldway; 2100 goto data_err; 2101 } 2102 if (err == -1) /* resume after OOB */ 2103 continue; 2104 /* 2105 * We hit the EOF prematurely. 2106 * Perhaps the file was externally truncated. 2107 */ 2108 if (cnt == 0) { 2109 msg = "Transfer finished due to " 2110 "premature end of file."; 2111 break; 2112 } 2113 } 2114 ENDXFER; 2115 reply(226, "%s", msg); 2116 return (0); 2117 } 2118 2119 oldway: 2120 if ((buf = malloc(blksize)) == NULL) { 2121 ENDXFER; 2122 reply(451, "Ran out of memory."); 2123 return (-1); 2124 } 2125 2126 for (;;) { 2127 int cnt, len; 2128 char *bp; 2129 2130 cnt = read(filefd, buf, blksize); 2131 CHECKOOB(free(buf); return (-1)) 2132 else if (cnt < 0) { 2133 free(buf); 2134 goto file_err; 2135 } 2136 if (cnt < 0) /* resume after OOB */ 2137 continue; 2138 if (cnt == 0) /* EOF */ 2139 break; 2140 for (len = cnt, bp = buf; len > 0;) { 2141 cnt = write(netfd, bp, len); 2142 CHECKOOB(free(buf); return (-1)) 2143 else if (cnt < 0) { 2144 free(buf); 2145 goto data_err; 2146 } 2147 if (cnt <= 0) 2148 continue; 2149 len -= cnt; 2150 bp += cnt; 2151 byte_count += cnt; 2152 } 2153 } 2154 ENDXFER; 2155 free(buf); 2156 reply(226, "Transfer complete."); 2157 return (0); 2158 default: 2159 ENDXFER; 2160 reply(550, "Unimplemented TYPE %d in send_data.", type); 2161 return (-1); 2162 } 2163 2164 data_err: 2165 ENDXFER; 2166 perror_reply(426, "Data connection"); 2167 return (-1); 2168 2169 file_err: 2170 ENDXFER; 2171 perror_reply(551, "Error on input file"); 2172 return (-1); 2173 } 2174 2175 /* 2176 * Transfer data from peer to "outstr" using the appropriate encapulation of 2177 * the data subject to Mode, Structure, and Type. 2178 * 2179 * N.B.: Form isn't handled. 2180 */ 2181 static int 2182 receive_data(FILE *instr, FILE *outstr) 2183 { 2184 int c, cp; 2185 int bare_lfs = 0; 2186 2187 STARTXFER; 2188 2189 switch (type) { 2190 2191 case TYPE_I: 2192 case TYPE_L: 2193 for (;;) { 2194 int cnt, len; 2195 char *bp; 2196 char buf[BUFSIZ]; 2197 2198 cnt = read(fileno(instr), buf, sizeof(buf)); 2199 CHECKOOB(return (-1)) 2200 else if (cnt < 0) 2201 goto data_err; 2202 if (cnt < 0) /* resume after OOB */ 2203 continue; 2204 if (cnt == 0) /* EOF */ 2205 break; 2206 for (len = cnt, bp = buf; len > 0;) { 2207 cnt = write(fileno(outstr), bp, len); 2208 CHECKOOB(return (-1)) 2209 else if (cnt < 0) 2210 goto file_err; 2211 if (cnt <= 0) 2212 continue; 2213 len -= cnt; 2214 bp += cnt; 2215 byte_count += cnt; 2216 } 2217 } 2218 ENDXFER; 2219 return (0); 2220 2221 case TYPE_E: 2222 ENDXFER; 2223 reply(553, "TYPE E not implemented."); 2224 return (-1); 2225 2226 case TYPE_A: 2227 cp = EOF; 2228 for (;;) { 2229 c = getc(instr); 2230 CHECKOOB(return (-1)) 2231 else if (c == EOF && ferror(instr)) 2232 goto data_err; 2233 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2234 clearerr(instr); 2235 continue; 2236 } 2237 2238 if (cp == '\r') { 2239 if (c != '\n') 2240 FTPD_PUTC('\r', outstr, file_err); 2241 } else 2242 if (c == '\n') 2243 bare_lfs++; 2244 if (c == '\r') { 2245 byte_count++; 2246 cp = c; 2247 continue; 2248 } 2249 2250 /* Check for EOF here in order not to lose last \r. */ 2251 if (c == EOF) { 2252 if (feof(instr)) /* EOF */ 2253 break; 2254 syslog(LOG_ERR, "Internal: impossible condition" 2255 " on data stream after getc()"); 2256 goto data_err; 2257 } 2258 2259 byte_count++; 2260 FTPD_PUTC(c, outstr, file_err); 2261 cp = c; 2262 } 2263 #ifdef notyet /* BSD stdio isn't ready for that */ 2264 while (fflush(outstr) == EOF) { 2265 CHECKOOB(return (-1)) 2266 else 2267 goto file_err; 2268 clearerr(outstr); 2269 } 2270 ENDXFER; 2271 #else 2272 ENDXFER; 2273 if (fflush(outstr) == EOF) 2274 goto file_err; 2275 #endif 2276 if (bare_lfs) { 2277 lreply(226, 2278 "WARNING! %d bare linefeeds received in ASCII mode.", 2279 bare_lfs); 2280 printf(" File may not have transferred correctly.\r\n"); 2281 } 2282 return (0); 2283 default: 2284 ENDXFER; 2285 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2286 return (-1); 2287 } 2288 2289 data_err: 2290 ENDXFER; 2291 perror_reply(426, "Data connection"); 2292 return (-1); 2293 2294 file_err: 2295 ENDXFER; 2296 perror_reply(452, "Error writing to file"); 2297 return (-1); 2298 } 2299 2300 void 2301 statfilecmd(char *filename) 2302 { 2303 FILE *fin; 2304 int atstart; 2305 int c, code; 2306 char line[LINE_MAX]; 2307 struct stat st; 2308 2309 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2310 snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2311 fin = ftpd_popen(line, "r"); 2312 lreply(code, "Status of %s:", filename); 2313 atstart = 1; 2314 while ((c = getc(fin)) != EOF) { 2315 if (c == '\n') { 2316 if (ferror(stdout)){ 2317 perror_reply(421, "Control connection"); 2318 ftpd_pclose(fin); 2319 dologout(1); 2320 /* NOTREACHED */ 2321 } 2322 if (ferror(fin)) { 2323 perror_reply(551, filename); 2324 ftpd_pclose(fin); 2325 return; 2326 } 2327 putc('\r', stdout); 2328 } 2329 /* 2330 * RFC 959 says neutral text should be prepended before 2331 * a leading 3-digit number followed by whitespace, but 2332 * many ftp clients can be confused by any leading digits, 2333 * as a matter of fact. 2334 */ 2335 if (atstart && isdigit(c)) 2336 putc(' ', stdout); 2337 putc(c, stdout); 2338 atstart = (c == '\n'); 2339 } 2340 ftpd_pclose(fin); 2341 reply(code, "End of status."); 2342 } 2343 2344 void 2345 statcmd(void) 2346 { 2347 union sockunion *su; 2348 u_char *a, *p; 2349 char hname[NI_MAXHOST]; 2350 int ispassive; 2351 2352 if (hostinfo) { 2353 lreply(211, "%s FTP server status:", hostname); 2354 printf(" %s\r\n", version); 2355 } else 2356 lreply(211, "FTP server status:"); 2357 printf(" Connected to %s", remotehost); 2358 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2359 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2360 hname[sizeof(hname) - 1] = 0; 2361 if (strcmp(hname, remotehost) != 0) 2362 printf(" (%s)", hname); 2363 } 2364 printf("\r\n"); 2365 if (logged_in) { 2366 if (guest) 2367 printf(" Logged in anonymously\r\n"); 2368 else 2369 printf(" Logged in as %s\r\n", pw->pw_name); 2370 } else if (askpasswd) 2371 printf(" Waiting for password\r\n"); 2372 else 2373 printf(" Waiting for user name\r\n"); 2374 printf(" TYPE: %s", typenames[type]); 2375 if (type == TYPE_A || type == TYPE_E) 2376 printf(", FORM: %s", formnames[form]); 2377 if (type == TYPE_L) 2378 #if CHAR_BIT == 8 2379 printf(" %d", CHAR_BIT); 2380 #else 2381 printf(" %d", bytesize); /* need definition! */ 2382 #endif 2383 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2384 strunames[stru], modenames[mode]); 2385 if (data != -1) 2386 printf(" Data connection open\r\n"); 2387 else if (pdata != -1) { 2388 ispassive = 1; 2389 su = &pasv_addr; 2390 goto printaddr; 2391 } else if (usedefault == 0) { 2392 ispassive = 0; 2393 su = &data_dest; 2394 printaddr: 2395 #define UC(b) (((int) b) & 0xff) 2396 if (epsvall) { 2397 printf(" EPSV only mode (EPSV ALL)\r\n"); 2398 goto epsvonly; 2399 } 2400 2401 /* PORT/PASV */ 2402 if (su->su_family == AF_INET) { 2403 a = (u_char *) &su->su_sin.sin_addr; 2404 p = (u_char *) &su->su_sin.sin_port; 2405 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2406 ispassive ? "PASV" : "PORT", 2407 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2408 UC(p[0]), UC(p[1])); 2409 } 2410 2411 /* LPRT/LPSV */ 2412 { 2413 int alen, af, i; 2414 2415 switch (su->su_family) { 2416 case AF_INET: 2417 a = (u_char *) &su->su_sin.sin_addr; 2418 p = (u_char *) &su->su_sin.sin_port; 2419 alen = sizeof(su->su_sin.sin_addr); 2420 af = 4; 2421 break; 2422 case AF_INET6: 2423 a = (u_char *) &su->su_sin6.sin6_addr; 2424 p = (u_char *) &su->su_sin6.sin6_port; 2425 alen = sizeof(su->su_sin6.sin6_addr); 2426 af = 6; 2427 break; 2428 default: 2429 af = 0; 2430 break; 2431 } 2432 if (af) { 2433 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2434 af, alen); 2435 for (i = 0; i < alen; i++) 2436 printf("%d,", UC(a[i])); 2437 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2438 } 2439 } 2440 2441 epsvonly:; 2442 /* EPRT/EPSV */ 2443 { 2444 int af; 2445 2446 switch (su->su_family) { 2447 case AF_INET: 2448 af = 1; 2449 break; 2450 case AF_INET6: 2451 af = 2; 2452 break; 2453 default: 2454 af = 0; 2455 break; 2456 } 2457 if (af) { 2458 union sockunion tmp; 2459 2460 tmp = *su; 2461 if (tmp.su_family == AF_INET6) 2462 tmp.su_sin6.sin6_scope_id = 0; 2463 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2464 hname, sizeof(hname) - 1, NULL, 0, 2465 NI_NUMERICHOST)) { 2466 hname[sizeof(hname) - 1] = 0; 2467 printf(" %s |%d|%s|%d|\r\n", 2468 ispassive ? "EPSV" : "EPRT", 2469 af, hname, htons(tmp.su_port)); 2470 } 2471 } 2472 } 2473 #undef UC 2474 } else 2475 printf(" No data connection\r\n"); 2476 reply(211, "End of status."); 2477 } 2478 2479 void 2480 fatalerror(char *s) 2481 { 2482 2483 reply(451, "Error in server: %s", s); 2484 reply(221, "Closing connection due to server error."); 2485 dologout(0); 2486 /* NOTREACHED */ 2487 } 2488 2489 void 2490 reply(int n, const char *fmt, ...) 2491 { 2492 va_list ap; 2493 2494 printf("%d ", n); 2495 va_start(ap, fmt); 2496 vprintf(fmt, ap); 2497 va_end(ap); 2498 printf("\r\n"); 2499 fflush(stdout); 2500 if (ftpdebug) { 2501 syslog(LOG_DEBUG, "<--- %d ", n); 2502 va_start(ap, fmt); 2503 vsyslog(LOG_DEBUG, fmt, ap); 2504 va_end(ap); 2505 } 2506 } 2507 2508 void 2509 lreply(int n, const char *fmt, ...) 2510 { 2511 va_list ap; 2512 2513 printf("%d- ", n); 2514 va_start(ap, fmt); 2515 vprintf(fmt, ap); 2516 va_end(ap); 2517 printf("\r\n"); 2518 fflush(stdout); 2519 if (ftpdebug) { 2520 syslog(LOG_DEBUG, "<--- %d- ", n); 2521 va_start(ap, fmt); 2522 vsyslog(LOG_DEBUG, fmt, ap); 2523 va_end(ap); 2524 } 2525 } 2526 2527 static void 2528 ack(char *s) 2529 { 2530 2531 reply(250, "%s command successful.", s); 2532 } 2533 2534 void 2535 nack(char *s) 2536 { 2537 2538 reply(502, "%s command not implemented.", s); 2539 } 2540 2541 /* ARGSUSED */ 2542 void 2543 yyerror(char *s) 2544 { 2545 char *cp; 2546 2547 if ((cp = strchr(cbuf,'\n'))) 2548 *cp = '\0'; 2549 reply(500, "%s: command not understood.", cbuf); 2550 } 2551 2552 void 2553 delete(char *name) 2554 { 2555 struct stat st; 2556 2557 LOGCMD("delete", name); 2558 if (lstat(name, &st) < 0) { 2559 perror_reply(550, name); 2560 return; 2561 } 2562 if (S_ISDIR(st.st_mode)) { 2563 if (rmdir(name) < 0) { 2564 perror_reply(550, name); 2565 return; 2566 } 2567 goto done; 2568 } 2569 if (guest && noguestmod) { 2570 reply(550, "Operation not permitted."); 2571 return; 2572 } 2573 if (unlink(name) < 0) { 2574 perror_reply(550, name); 2575 return; 2576 } 2577 done: 2578 ack("DELE"); 2579 } 2580 2581 void 2582 cwd(char *path) 2583 { 2584 2585 if (chdir(path) < 0) 2586 perror_reply(550, path); 2587 else 2588 ack("CWD"); 2589 } 2590 2591 void 2592 makedir(char *name) 2593 { 2594 char *s; 2595 2596 LOGCMD("mkdir", name); 2597 if (guest && noguestmkd) 2598 reply(550, "Operation not permitted."); 2599 else if (mkdir(name, 0777) < 0) 2600 perror_reply(550, name); 2601 else { 2602 if ((s = doublequote(name)) == NULL) 2603 fatalerror("Ran out of memory."); 2604 reply(257, "\"%s\" directory created.", s); 2605 free(s); 2606 } 2607 } 2608 2609 void 2610 removedir(char *name) 2611 { 2612 2613 LOGCMD("rmdir", name); 2614 if (rmdir(name) < 0) 2615 perror_reply(550, name); 2616 else 2617 ack("RMD"); 2618 } 2619 2620 void 2621 pwd(void) 2622 { 2623 char *s, path[MAXPATHLEN + 1]; 2624 2625 if (getcwd(path, sizeof(path)) == NULL) 2626 perror_reply(550, "Get current directory"); 2627 else { 2628 if ((s = doublequote(path)) == NULL) 2629 fatalerror("Ran out of memory."); 2630 reply(257, "\"%s\" is current directory.", s); 2631 free(s); 2632 } 2633 } 2634 2635 char * 2636 renamefrom(char *name) 2637 { 2638 struct stat st; 2639 2640 if (guest && noguestmod) { 2641 reply(550, "Operation not permitted."); 2642 return (NULL); 2643 } 2644 if (lstat(name, &st) < 0) { 2645 perror_reply(550, name); 2646 return (NULL); 2647 } 2648 reply(350, "File exists, ready for destination name."); 2649 return (name); 2650 } 2651 2652 void 2653 renamecmd(char *from, char *to) 2654 { 2655 struct stat st; 2656 2657 LOGCMD2("rename", from, to); 2658 2659 if (guest && (stat(to, &st) == 0)) { 2660 reply(550, "%s: permission denied.", to); 2661 return; 2662 } 2663 2664 if (rename(from, to) < 0) 2665 perror_reply(550, "rename"); 2666 else 2667 ack("RNTO"); 2668 } 2669 2670 static void 2671 dolog(struct sockaddr *who) 2672 { 2673 char who_name[NI_MAXHOST]; 2674 2675 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2676 remotehost[sizeof(remotehost) - 1] = 0; 2677 if (getnameinfo(who, who->sa_len, 2678 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2679 *who_name = 0; 2680 who_name[sizeof(who_name) - 1] = 0; 2681 2682 #ifdef SETPROCTITLE 2683 #ifdef VIRTUAL_HOSTING 2684 if (thishost != firsthost) 2685 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2686 remotehost, hostname); 2687 else 2688 #endif 2689 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2690 remotehost); 2691 setproctitle("%s", proctitle); 2692 #endif /* SETPROCTITLE */ 2693 2694 if (logging) { 2695 #ifdef VIRTUAL_HOSTING 2696 if (thishost != firsthost) 2697 syslog(LOG_INFO, "connection from %s (%s) to %s", 2698 remotehost, who_name, hostname); 2699 else 2700 #endif 2701 syslog(LOG_INFO, "connection from %s (%s)", 2702 remotehost, who_name); 2703 } 2704 } 2705 2706 /* 2707 * Record logout in wtmp file 2708 * and exit with supplied status. 2709 */ 2710 void 2711 dologout(int status) 2712 { 2713 2714 if (logged_in && dowtmp) { 2715 seteuid(0); 2716 ftpd_logwtmp(ttyline, "", NULL); 2717 } 2718 /* beware of flushing buffers after a SIGPIPE */ 2719 _exit(status); 2720 } 2721 2722 static void 2723 sigurg(int signo) 2724 { 2725 2726 recvurg = 1; 2727 } 2728 2729 static void 2730 maskurg(int flag) 2731 { 2732 int oerrno; 2733 sigset_t sset; 2734 2735 if (!transflag) { 2736 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2737 return; 2738 } 2739 oerrno = errno; 2740 sigemptyset(&sset); 2741 sigaddset(&sset, SIGURG); 2742 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2743 errno = oerrno; 2744 } 2745 2746 static void 2747 flagxfer(int flag) 2748 { 2749 2750 if (flag) { 2751 if (transflag) 2752 syslog(LOG_ERR, "Internal: flagxfer(1): " 2753 "transfer already under way"); 2754 transflag = 1; 2755 maskurg(0); 2756 recvurg = 0; 2757 } else { 2758 if (!transflag) 2759 syslog(LOG_ERR, "Internal: flagxfer(0): " 2760 "no active transfer"); 2761 maskurg(1); 2762 transflag = 0; 2763 } 2764 } 2765 2766 /* 2767 * Returns 0 if OK to resume or -1 if abort requested. 2768 */ 2769 static int 2770 myoob(void) 2771 { 2772 char *cp; 2773 int ret; 2774 2775 if (!transflag) { 2776 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2777 return (0); 2778 } 2779 cp = tmpline; 2780 ret = get_line(cp, 7, stdin); 2781 if (ret == -1) { 2782 reply(221, "You could at least say goodbye."); 2783 dologout(0); 2784 } else if (ret == -2) { 2785 /* Ignore truncated command. */ 2786 return (0); 2787 } 2788 upper(cp); 2789 if (strcmp(cp, "ABOR\r\n") == 0) { 2790 tmpline[0] = '\0'; 2791 reply(426, "Transfer aborted. Data connection closed."); 2792 reply(226, "Abort successful."); 2793 return (-1); 2794 } 2795 if (strcmp(cp, "STAT\r\n") == 0) { 2796 tmpline[0] = '\0'; 2797 if (file_size != -1) 2798 reply(213, "Status: %jd of %jd bytes transferred.", 2799 (intmax_t)byte_count, (intmax_t)file_size); 2800 else 2801 reply(213, "Status: %jd bytes transferred.", 2802 (intmax_t)byte_count); 2803 } 2804 return (0); 2805 } 2806 2807 /* 2808 * Note: a response of 425 is not mentioned as a possible response to 2809 * the PASV command in RFC959. However, it has been blessed as 2810 * a legitimate response by Jon Postel in a telephone conversation 2811 * with Rick Adams on 25 Jan 89. 2812 */ 2813 void 2814 passive(void) 2815 { 2816 socklen_t len; 2817 int on; 2818 char *p, *a; 2819 2820 if (pdata >= 0) /* close old port if one set */ 2821 close(pdata); 2822 2823 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2824 if (pdata < 0) { 2825 perror_reply(425, "Can't open passive connection"); 2826 return; 2827 } 2828 on = 1; 2829 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2830 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2831 2832 seteuid(0); 2833 2834 #ifdef IP_PORTRANGE 2835 if (ctrl_addr.su_family == AF_INET) { 2836 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2837 : IP_PORTRANGE_DEFAULT; 2838 2839 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2840 &on, sizeof(on)) < 0) 2841 goto pasv_error; 2842 } 2843 #endif 2844 #ifdef IPV6_PORTRANGE 2845 if (ctrl_addr.su_family == AF_INET6) { 2846 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2847 : IPV6_PORTRANGE_DEFAULT; 2848 2849 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2850 &on, sizeof(on)) < 0) 2851 goto pasv_error; 2852 } 2853 #endif 2854 2855 pasv_addr = ctrl_addr; 2856 pasv_addr.su_port = 0; 2857 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2858 goto pasv_error; 2859 2860 seteuid(pw->pw_uid); 2861 2862 len = sizeof(pasv_addr); 2863 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2864 goto pasv_error; 2865 if (listen(pdata, 1) < 0) 2866 goto pasv_error; 2867 if (pasv_addr.su_family == AF_INET) 2868 a = (char *) &pasv_addr.su_sin.sin_addr; 2869 else if (pasv_addr.su_family == AF_INET6 && 2870 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2871 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2872 else 2873 goto pasv_error; 2874 2875 p = (char *) &pasv_addr.su_port; 2876 2877 #define UC(b) (((int) b) & 0xff) 2878 2879 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2880 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2881 return; 2882 2883 pasv_error: 2884 seteuid(pw->pw_uid); 2885 close(pdata); 2886 pdata = -1; 2887 perror_reply(425, "Can't open passive connection"); 2888 return; 2889 } 2890 2891 /* 2892 * Long Passive defined in RFC 1639. 2893 * 228 Entering Long Passive Mode 2894 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2895 */ 2896 2897 void 2898 long_passive(char *cmd, int pf) 2899 { 2900 socklen_t len; 2901 int on; 2902 char *p, *a; 2903 2904 if (pdata >= 0) /* close old port if one set */ 2905 close(pdata); 2906 2907 if (pf != PF_UNSPEC) { 2908 if (ctrl_addr.su_family != pf) { 2909 switch (ctrl_addr.su_family) { 2910 case AF_INET: 2911 pf = 1; 2912 break; 2913 case AF_INET6: 2914 pf = 2; 2915 break; 2916 default: 2917 pf = 0; 2918 break; 2919 } 2920 /* 2921 * XXX 2922 * only EPRT/EPSV ready clients will understand this 2923 */ 2924 if (strcmp(cmd, "EPSV") == 0 && pf) { 2925 reply(522, "Network protocol mismatch, " 2926 "use (%d)", pf); 2927 } else 2928 reply(501, "Network protocol mismatch."); /*XXX*/ 2929 2930 return; 2931 } 2932 } 2933 2934 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2935 if (pdata < 0) { 2936 perror_reply(425, "Can't open passive connection"); 2937 return; 2938 } 2939 on = 1; 2940 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2941 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2942 2943 seteuid(0); 2944 2945 pasv_addr = ctrl_addr; 2946 pasv_addr.su_port = 0; 2947 len = pasv_addr.su_len; 2948 2949 #ifdef IP_PORTRANGE 2950 if (ctrl_addr.su_family == AF_INET) { 2951 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2952 : IP_PORTRANGE_DEFAULT; 2953 2954 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2955 &on, sizeof(on)) < 0) 2956 goto pasv_error; 2957 } 2958 #endif 2959 #ifdef IPV6_PORTRANGE 2960 if (ctrl_addr.su_family == AF_INET6) { 2961 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2962 : IPV6_PORTRANGE_DEFAULT; 2963 2964 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2965 &on, sizeof(on)) < 0) 2966 goto pasv_error; 2967 } 2968 #endif 2969 2970 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2971 goto pasv_error; 2972 2973 seteuid(pw->pw_uid); 2974 2975 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2976 goto pasv_error; 2977 if (listen(pdata, 1) < 0) 2978 goto pasv_error; 2979 2980 #define UC(b) (((int) b) & 0xff) 2981 2982 if (strcmp(cmd, "LPSV") == 0) { 2983 p = (char *)&pasv_addr.su_port; 2984 switch (pasv_addr.su_family) { 2985 case AF_INET: 2986 a = (char *) &pasv_addr.su_sin.sin_addr; 2987 v4_reply: 2988 reply(228, 2989 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2990 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2991 2, UC(p[0]), UC(p[1])); 2992 return; 2993 case AF_INET6: 2994 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2995 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2996 goto v4_reply; 2997 } 2998 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2999 reply(228, 3000 "Entering Long Passive Mode " 3001 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3002 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3003 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3004 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3005 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3006 2, UC(p[0]), UC(p[1])); 3007 return; 3008 } 3009 } else if (strcmp(cmd, "EPSV") == 0) { 3010 switch (pasv_addr.su_family) { 3011 case AF_INET: 3012 case AF_INET6: 3013 reply(229, "Entering Extended Passive Mode (|||%d|)", 3014 ntohs(pasv_addr.su_port)); 3015 return; 3016 } 3017 } else { 3018 /* more proper error code? */ 3019 } 3020 3021 pasv_error: 3022 seteuid(pw->pw_uid); 3023 close(pdata); 3024 pdata = -1; 3025 perror_reply(425, "Can't open passive connection"); 3026 return; 3027 } 3028 3029 /* 3030 * Generate unique name for file with basename "local" 3031 * and open the file in order to avoid possible races. 3032 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3033 * Return descriptor to the file, set "name" to its name. 3034 * 3035 * Generates failure reply on error. 3036 */ 3037 static int 3038 guniquefd(char *local, char **name) 3039 { 3040 static char new[MAXPATHLEN]; 3041 struct stat st; 3042 char *cp; 3043 int count; 3044 int fd; 3045 3046 cp = strrchr(local, '/'); 3047 if (cp) 3048 *cp = '\0'; 3049 if (stat(cp ? local : ".", &st) < 0) { 3050 perror_reply(553, cp ? local : "."); 3051 return (-1); 3052 } 3053 if (cp) { 3054 /* 3055 * Let not overwrite dirname with counter suffix. 3056 * -4 is for /nn\0 3057 * In this extreme case dot won't be put in front of suffix. 3058 */ 3059 if (strlen(local) > sizeof(new) - 4) { 3060 reply(553, "Pathname too long."); 3061 return (-1); 3062 } 3063 *cp = '/'; 3064 } 3065 /* -4 is for the .nn<null> we put on the end below */ 3066 snprintf(new, sizeof(new) - 4, "%s", local); 3067 cp = new + strlen(new); 3068 /* 3069 * Don't generate dotfile unless requested explicitly. 3070 * This covers the case when basename gets truncated off 3071 * by buffer size. 3072 */ 3073 if (cp > new && cp[-1] != '/') 3074 *cp++ = '.'; 3075 for (count = 0; count < 100; count++) { 3076 /* At count 0 try unmodified name */ 3077 if (count) 3078 sprintf(cp, "%d", count); 3079 if ((fd = open(count ? new : local, 3080 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3081 *name = count ? new : local; 3082 return (fd); 3083 } 3084 if (errno != EEXIST) { 3085 perror_reply(553, count ? new : local); 3086 return (-1); 3087 } 3088 } 3089 reply(452, "Unique file name cannot be created."); 3090 return (-1); 3091 } 3092 3093 /* 3094 * Format and send reply containing system error number. 3095 */ 3096 void 3097 perror_reply(int code, char *string) 3098 { 3099 3100 reply(code, "%s: %s.", string, strerror(errno)); 3101 } 3102 3103 static char *onefile[] = { 3104 "", 3105 0 3106 }; 3107 3108 void 3109 send_file_list(char *whichf) 3110 { 3111 struct stat st; 3112 DIR *dirp = NULL; 3113 struct dirent *dir; 3114 FILE *dout = NULL; 3115 char **dirlist, *dirname; 3116 int simple = 0; 3117 int freeglob = 0; 3118 glob_t gl; 3119 3120 if (strpbrk(whichf, "~{[*?") != NULL) { 3121 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3122 3123 memset(&gl, 0, sizeof(gl)); 3124 gl.gl_matchc = MAXGLOBARGS; 3125 /*flags |= GLOB_LIMIT;*/ 3126 freeglob = 1; 3127 if (glob(whichf, flags, 0, &gl)) { 3128 reply(550, "No matching files found."); 3129 goto out; 3130 } else if (gl.gl_pathc == 0) { 3131 errno = ENOENT; 3132 perror_reply(550, whichf); 3133 goto out; 3134 } 3135 dirlist = gl.gl_pathv; 3136 } else { 3137 onefile[0] = whichf; 3138 dirlist = onefile; 3139 simple = 1; 3140 } 3141 3142 while ((dirname = *dirlist++)) { 3143 if (stat(dirname, &st) < 0) { 3144 /* 3145 * If user typed "ls -l", etc, and the client 3146 * used NLST, do what the user meant. 3147 */ 3148 if (dirname[0] == '-' && *dirlist == NULL && 3149 dout == NULL) 3150 retrieve(_PATH_LS " %s", dirname); 3151 else 3152 perror_reply(550, whichf); 3153 goto out; 3154 } 3155 3156 if (S_ISREG(st.st_mode)) { 3157 if (dout == NULL) { 3158 dout = dataconn("file list", -1, "w"); 3159 if (dout == NULL) 3160 goto out; 3161 STARTXFER; 3162 } 3163 START_UNSAFE; 3164 fprintf(dout, "%s%s\n", dirname, 3165 type == TYPE_A ? "\r" : ""); 3166 END_UNSAFE; 3167 if (ferror(dout)) 3168 goto data_err; 3169 byte_count += strlen(dirname) + 3170 (type == TYPE_A ? 2 : 1); 3171 CHECKOOB(goto abrt); 3172 continue; 3173 } else if (!S_ISDIR(st.st_mode)) 3174 continue; 3175 3176 if ((dirp = opendir(dirname)) == NULL) 3177 continue; 3178 3179 while ((dir = readdir(dirp)) != NULL) { 3180 char nbuf[MAXPATHLEN]; 3181 3182 CHECKOOB(goto abrt); 3183 3184 if (strcmp(dir->d_name, ".") == 0) 3185 continue; 3186 if (strcmp(dir->d_name, "..") == 0) 3187 continue; 3188 3189 snprintf(nbuf, sizeof(nbuf), 3190 "%s/%s", dirname, dir->d_name); 3191 3192 /* 3193 * We have to do a stat to insure it's 3194 * not a directory or special file. 3195 */ 3196 if (simple || (stat(nbuf, &st) == 0 && 3197 S_ISREG(st.st_mode))) { 3198 if (dout == NULL) { 3199 dout = dataconn("file list", -1, "w"); 3200 if (dout == NULL) 3201 goto out; 3202 STARTXFER; 3203 } 3204 START_UNSAFE; 3205 if (nbuf[0] == '.' && nbuf[1] == '/') 3206 fprintf(dout, "%s%s\n", &nbuf[2], 3207 type == TYPE_A ? "\r" : ""); 3208 else 3209 fprintf(dout, "%s%s\n", nbuf, 3210 type == TYPE_A ? "\r" : ""); 3211 END_UNSAFE; 3212 if (ferror(dout)) 3213 goto data_err; 3214 byte_count += strlen(nbuf) + 3215 (type == TYPE_A ? 2 : 1); 3216 CHECKOOB(goto abrt); 3217 } 3218 } 3219 closedir(dirp); 3220 dirp = NULL; 3221 } 3222 3223 if (dout == NULL) 3224 reply(550, "No files found."); 3225 else if (ferror(dout)) 3226 data_err: perror_reply(550, "Data connection"); 3227 else 3228 reply(226, "Transfer complete."); 3229 out: 3230 if (dout) { 3231 ENDXFER; 3232 abrt: 3233 fclose(dout); 3234 data = -1; 3235 pdata = -1; 3236 } 3237 if (dirp) 3238 closedir(dirp); 3239 if (freeglob) { 3240 freeglob = 0; 3241 globfree(&gl); 3242 } 3243 } 3244 3245 void 3246 reapchild(int signo) 3247 { 3248 while (waitpid(-1, NULL, WNOHANG) > 0); 3249 } 3250 3251 static void 3252 appendf(char **strp, char *fmt, ...) 3253 { 3254 va_list ap; 3255 char *ostr, *p; 3256 3257 va_start(ap, fmt); 3258 vasprintf(&p, fmt, ap); 3259 va_end(ap); 3260 if (p == NULL) 3261 fatalerror("Ran out of memory."); 3262 if (*strp == NULL) 3263 *strp = p; 3264 else { 3265 ostr = *strp; 3266 asprintf(strp, "%s%s", ostr, p); 3267 if (*strp == NULL) 3268 fatalerror("Ran out of memory."); 3269 free(ostr); 3270 } 3271 } 3272 3273 static void 3274 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3275 { 3276 char *msg = NULL; 3277 char wd[MAXPATHLEN + 1]; 3278 3279 if (logging <= 1) 3280 return; 3281 3282 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3283 strcpy(wd, strerror(errno)); 3284 3285 appendf(&msg, "%s", cmd); 3286 if (file1) 3287 appendf(&msg, " %s", file1); 3288 if (file2) 3289 appendf(&msg, " %s", file2); 3290 if (cnt >= 0) 3291 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3292 appendf(&msg, " (wd: %s", wd); 3293 if (guest || dochroot) 3294 appendf(&msg, "; chrooted"); 3295 appendf(&msg, ")"); 3296 syslog(LOG_INFO, "%s", msg); 3297 free(msg); 3298 } 3299 3300 static void 3301 logxfer(char *name, off_t size, time_t start) 3302 { 3303 char buf[MAXPATHLEN + 1024]; 3304 char path[MAXPATHLEN + 1]; 3305 time_t now; 3306 3307 if (statfd >= 0) { 3308 time(&now); 3309 if (realpath(name, path) == NULL) { 3310 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3311 return; 3312 } 3313 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3314 ctime(&now)+4, ident, remotehost, 3315 path, (intmax_t)size, 3316 (long)(now - start + (now == start))); 3317 write(statfd, buf, strlen(buf)); 3318 } 3319 } 3320 3321 static char * 3322 doublequote(char *s) 3323 { 3324 int n; 3325 char *p, *s2; 3326 3327 for (p = s, n = 0; *p; p++) 3328 if (*p == '"') 3329 n++; 3330 3331 if ((s2 = malloc(p - s + n + 1)) == NULL) 3332 return (NULL); 3333 3334 for (p = s2; *s; s++, p++) { 3335 if ((*p = *s) == '"') 3336 *(++p) = '"'; 3337 } 3338 *p = '\0'; 3339 3340 return (s2); 3341 } 3342 3343 /* setup server socket for specified address family */ 3344 /* if af is PF_UNSPEC more than one socket may be returned */ 3345 /* the returned list is dynamically allocated, so caller needs to free it */ 3346 static int * 3347 socksetup(int af, char *bindname, const char *bindport) 3348 { 3349 struct addrinfo hints, *res, *r; 3350 int error, maxs, *s, *socks; 3351 const int on = 1; 3352 3353 memset(&hints, 0, sizeof(hints)); 3354 hints.ai_flags = AI_PASSIVE; 3355 hints.ai_family = af; 3356 hints.ai_socktype = SOCK_STREAM; 3357 error = getaddrinfo(bindname, bindport, &hints, &res); 3358 if (error) { 3359 syslog(LOG_ERR, "%s", gai_strerror(error)); 3360 if (error == EAI_SYSTEM) 3361 syslog(LOG_ERR, "%s", strerror(errno)); 3362 return NULL; 3363 } 3364 3365 /* Count max number of sockets we may open */ 3366 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3367 ; 3368 socks = malloc((maxs + 1) * sizeof(int)); 3369 if (!socks) { 3370 freeaddrinfo(res); 3371 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3372 return NULL; 3373 } 3374 3375 *socks = 0; /* num of sockets counter at start of array */ 3376 s = socks + 1; 3377 for (r = res; r; r = r->ai_next) { 3378 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3379 if (*s < 0) { 3380 syslog(LOG_DEBUG, "control socket: %m"); 3381 continue; 3382 } 3383 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3384 &on, sizeof(on)) < 0) 3385 syslog(LOG_WARNING, 3386 "control setsockopt (SO_REUSEADDR): %m"); 3387 if (r->ai_family == AF_INET6) { 3388 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3389 &on, sizeof(on)) < 0) 3390 syslog(LOG_WARNING, 3391 "control setsockopt (IPV6_V6ONLY): %m"); 3392 } 3393 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3394 syslog(LOG_DEBUG, "control bind: %m"); 3395 close(*s); 3396 continue; 3397 } 3398 (*socks)++; 3399 s++; 3400 } 3401 3402 if (res) 3403 freeaddrinfo(res); 3404 3405 if (*socks == 0) { 3406 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3407 free(socks); 3408 return NULL; 3409 } 3410 return(socks); 3411 } 3412