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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ftpd.c 8.4 (Berkeley) 4/16/94 34 * $FreeBSD: src/libexec/ftpd/ftpd.c,v 1.213 2008/12/23 01:23:09 cperciva Exp $ 35 */ 36 37 /* 38 * FTP server. 39 */ 40 #include <sys/param.h> 41 #include <sys/ioctl.h> 42 #include <sys/mman.h> 43 #include <sys/socket.h> 44 #include <sys/stat.h> 45 #include <sys/time.h> 46 #include <sys/wait.h> 47 48 #include <netinet/in.h> 49 #include <netinet/in_systm.h> 50 #include <netinet/ip.h> 51 #include <netinet/tcp.h> 52 53 #define FTP_NAMES 54 #include <arpa/ftp.h> 55 #include <arpa/inet.h> 56 #include <arpa/telnet.h> 57 58 #include <ctype.h> 59 #include <dirent.h> 60 #include <err.h> 61 #include <errno.h> 62 #include <fcntl.h> 63 #include <glob.h> 64 #include <limits.h> 65 #include <netdb.h> 66 #include <pwd.h> 67 #include <grp.h> 68 #include <opie.h> 69 #include <signal.h> 70 #include <stdint.h> 71 #include <stdio.h> 72 #include <stdlib.h> 73 #include <string.h> 74 #include <syslog.h> 75 #include <time.h> 76 #include <unistd.h> 77 #include <libutil.h> 78 #ifdef LOGIN_CAP 79 #include <login_cap.h> 80 #endif 81 82 #ifdef USE_PAM 83 #include <security/pam_appl.h> 84 #endif 85 86 #include "pathnames.h" 87 #include "extern.h" 88 #include "pidfile.h" 89 90 #include <stdarg.h> 91 92 static char version[] = "Version 6.00LS"; 93 #undef main 94 95 extern off_t restart_point; 96 extern char cbuf[]; 97 98 union sockunion ctrl_addr; 99 union sockunion data_source; 100 union sockunion data_dest; 101 union sockunion his_addr; 102 union sockunion pasv_addr; 103 104 int daemon_mode; 105 int data; 106 int dataport; 107 int hostinfo = 1; /* print host-specific info in messages */ 108 int logged_in; 109 struct passwd *pw; 110 char *homedir; 111 int ftpdebug; 112 int timeout = 900; /* timeout after 15 minutes of inactivity */ 113 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 114 int logging; 115 int restricted_data_ports = 1; 116 int paranoid = 1; /* be extra careful about security */ 117 int anon_only = 0; /* Only anonymous ftp allowed */ 118 int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 119 int guest; 120 int dochroot; 121 char *chrootdir; 122 int dowtmp = 1; 123 int stats; 124 int statfd = -1; 125 int type; 126 int form; 127 int stru; /* avoid C keyword */ 128 int mode; 129 int usedefault = 1; /* for data transfers */ 130 int pdata = -1; /* for passive mode */ 131 int readonly = 0; /* Server is in readonly mode. */ 132 int noepsv = 0; /* EPSV command is disabled. */ 133 int noretr = 0; /* RETR command is disabled. */ 134 int noguestretr = 0; /* RETR command is disabled for anon users. */ 135 int noguestmkd = 0; /* MKD command is disabled for anon users. */ 136 int noguestmod = 1; /* anon users may not modify existing files. */ 137 138 off_t file_size; 139 off_t byte_count; 140 #if !defined(CMASK) || CMASK == 0 141 #undef CMASK 142 #define CMASK 027 143 #endif 144 int defumask = CMASK; /* default umask value */ 145 char tmpline[7]; 146 char *hostname; 147 int epsvall = 0; 148 149 #ifdef VIRTUAL_HOSTING 150 char *ftpuser; 151 152 static struct ftphost { 153 struct ftphost *next; 154 struct addrinfo *hostinfo; 155 char *hostname; 156 char *anonuser; 157 char *statfile; 158 char *welcome; 159 char *loginmsg; 160 } *thishost, *firsthost; 161 162 #endif 163 char remotehost[NI_MAXHOST]; 164 char *ident = NULL; 165 166 static char ttyline[20]; 167 char *tty = ttyline; /* for klogin */ 168 169 #ifdef USE_PAM 170 static int auth_pam(struct passwd**, const char*); 171 pam_handle_t *pamh = NULL; 172 #endif 173 174 static struct opie opiedata; 175 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 176 static int pwok; 177 178 char *pid_file = NULL; /* means default location to pidfile(3) */ 179 180 /* 181 * Limit number of pathnames that glob can return. 182 * A limit of 0 indicates the number of pathnames is unlimited. 183 */ 184 #define MAXGLOBARGS 16384 185 # 186 187 /* 188 * Timeout intervals for retrying connections 189 * to hosts that don't accept PORT cmds. This 190 * is a kludge, but given the problems with TCP... 191 */ 192 #define SWAITMAX 90 /* wait at most 90 seconds */ 193 #define SWAITINT 5 /* interval between retries */ 194 195 int swaitmax = SWAITMAX; 196 int swaitint = SWAITINT; 197 198 #ifdef SETPROCTITLE 199 char proctitle[LINE_MAX]; /* initial part of title */ 200 #endif /* SETPROCTITLE */ 201 202 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 203 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 204 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 205 206 static volatile sig_atomic_t recvurg; 207 static int transflag; /* NB: for debugging only */ 208 209 #define STARTXFER flagxfer(1) 210 #define ENDXFER flagxfer(0) 211 212 #define START_UNSAFE maskurg(1) 213 #define END_UNSAFE maskurg(0) 214 215 /* It's OK to put an `else' clause after this macro. */ 216 #define CHECKOOB(action) \ 217 if (recvurg) { \ 218 recvurg = 0; \ 219 if (myoob()) { \ 220 ENDXFER; \ 221 action; \ 222 } \ 223 } 224 225 #ifdef VIRTUAL_HOSTING 226 static void inithosts(int); 227 static void selecthost(union sockunion *); 228 #endif 229 static void ack(char *); 230 static void sigurg(int); 231 static void maskurg(int); 232 static void flagxfer(int); 233 static int myoob(void); 234 static int checkuser(char *, char *, int, char **); 235 static FILE *dataconn(char *, off_t, char *); 236 static void dolog(struct sockaddr *); 237 static void end_login(void); 238 static FILE *getdatasock(char *); 239 static int guniquefd(char *, char **); 240 static void lostconn(int); 241 static void sigquit(int); 242 static int receive_data(FILE *, FILE *); 243 static int send_data(FILE *, FILE *, size_t, off_t, int); 244 static struct passwd * 245 sgetpwnam(char *); 246 static char *sgetsave(char *); 247 static void reapchild(int); 248 static void appendf(char **, char *, ...) __printflike(2, 3); 249 static void logcmd(char *, char *, char *, off_t); 250 static void logxfer(char *, off_t, time_t); 251 static char *doublequote(char *); 252 static int *socksetup(int, char *, const char *); 253 254 int 255 main(int argc, char *argv[]) 256 { 257 socklen_t addrlen; 258 int ch, on = 1, tos; 259 char *cp, line[LINE_MAX]; 260 FILE *fd; 261 char *bindname = NULL; 262 const char *bindport = "ftp"; 263 int family = AF_UNSPEC; 264 struct sigaction sa; 265 266 tzset(); /* in case no timezone database in ~ftp */ 267 sigemptyset(&sa.sa_mask); 268 sa.sa_flags = SA_RESTART; 269 270 /* 271 * Prevent diagnostic messages from appearing on stderr. 272 * We run as a daemon or from inetd; in both cases, there's 273 * more reason in logging to syslog. 274 */ 275 freopen(_PATH_DEVNULL, "w", stderr); 276 opterr = 0; 277 278 /* 279 * LOG_NDELAY sets up the logging connection immediately, 280 * necessary for anonymous ftp's that chroot and can't do it later. 281 */ 282 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 283 284 while ((ch = getopt(argc, argv, 285 "468a:AdDEH:hlmMoOp:P:rRSt:T:u:UvW")) != -1) { 286 switch (ch) { 287 case '4': 288 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 289 break; 290 291 case '6': 292 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 293 break; 294 295 case '8': 296 assumeutf8 = 1; 297 break; 298 299 case 'a': 300 bindname = optarg; 301 break; 302 303 case 'A': 304 anon_only = 1; 305 break; 306 307 case 'd': 308 ftpdebug++; 309 break; 310 311 case 'D': 312 daemon_mode++; 313 break; 314 315 case 'E': 316 noepsv = 1; 317 break; 318 319 case 'h': 320 hostinfo = 0; 321 break; 322 323 case 'H': 324 hostname = optarg; 325 break; 326 327 case 'l': 328 logging++; /* > 1 == extra logging */ 329 break; 330 331 case 'm': 332 noguestmod = 0; 333 break; 334 335 case 'M': 336 noguestmkd = 1; 337 break; 338 339 case 'o': 340 noretr = 1; 341 break; 342 343 case 'O': 344 noguestretr = 1; 345 break; 346 347 case 'p': 348 pid_file = optarg; 349 break; 350 351 case 'P': 352 bindport = optarg; 353 break; 354 355 case 'r': 356 readonly = 1; 357 break; 358 359 case 'R': 360 paranoid = 0; 361 break; 362 363 case 'S': 364 stats++; 365 break; 366 367 case 't': 368 timeout = atoi(optarg); 369 if (maxtimeout < timeout) 370 maxtimeout = timeout; 371 break; 372 373 case 'T': 374 maxtimeout = atoi(optarg); 375 if (timeout > maxtimeout) 376 timeout = maxtimeout; 377 break; 378 379 case 'u': 380 { 381 long val = 0; 382 383 val = strtol(optarg, &optarg, 8); 384 if (*optarg != '\0' || val < 0) 385 syslog(LOG_WARNING, "bad value for -u"); 386 else 387 defumask = val; 388 break; 389 } 390 case 'U': 391 restricted_data_ports = 0; 392 break; 393 394 case 'v': 395 ftpdebug++; 396 break; 397 398 case 'W': 399 dowtmp = 0; 400 break; 401 402 default: 403 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 404 break; 405 } 406 } 407 408 if (daemon_mode) { 409 int *ctl_sock, fd, maxfd = -1, nfds, i; 410 fd_set defreadfds, readfds; 411 pid_t pid; 412 struct pidfh *pfh; 413 414 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) { 415 if (errno == EEXIST) { 416 syslog(LOG_ERR, "%s already running, pid %d", 417 getprogname(), (int)pid); 418 exit(1); 419 } 420 syslog(LOG_WARNING, "pidfile_open: %m"); 421 } 422 423 /* 424 * Detach from parent. 425 */ 426 if (daemon(1, 1) < 0) { 427 syslog(LOG_ERR, "failed to become a daemon"); 428 exit(1); 429 } 430 431 if (pfh != NULL && pidfile_write(pfh) == -1) 432 syslog(LOG_WARNING, "pidfile_write: %m"); 433 434 sa.sa_handler = reapchild; 435 sigaction(SIGCHLD, &sa, NULL); 436 437 #ifdef VIRTUAL_HOSTING 438 inithosts(family); 439 #endif 440 441 /* 442 * Open a socket, bind it to the FTP port, and start 443 * listening. 444 */ 445 ctl_sock = socksetup(family, bindname, bindport); 446 if (ctl_sock == NULL) 447 exit(1); 448 449 FD_ZERO(&defreadfds); 450 for (i = 1; i <= *ctl_sock; i++) { 451 FD_SET(ctl_sock[i], &defreadfds); 452 if (listen(ctl_sock[i], 32) < 0) { 453 syslog(LOG_ERR, "control listen: %m"); 454 exit(1); 455 } 456 if (maxfd < ctl_sock[i]) 457 maxfd = ctl_sock[i]; 458 } 459 460 /* 461 * Loop forever accepting connection requests and forking off 462 * children to handle them. 463 */ 464 while (1) { 465 FD_COPY(&defreadfds, &readfds); 466 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 467 if (nfds <= 0) { 468 if (nfds < 0 && errno != EINTR) 469 syslog(LOG_WARNING, "select: %m"); 470 continue; 471 } 472 473 pid = -1; 474 for (i = 1; i <= *ctl_sock; i++) 475 if (FD_ISSET(ctl_sock[i], &readfds)) { 476 addrlen = sizeof(his_addr); 477 fd = accept(ctl_sock[i], 478 (struct sockaddr *)&his_addr, 479 &addrlen); 480 if (fd == -1) { 481 syslog(LOG_WARNING, 482 "accept: %m"); 483 continue; 484 } 485 switch (pid = fork()) { 486 case 0: 487 /* child */ 488 dup2(fd, 0); 489 dup2(fd, 1); 490 close(fd); 491 for (i = 1; i <= *ctl_sock; i++) 492 close(ctl_sock[i]); 493 if (pfh != NULL) 494 pidfile_close(pfh); 495 goto gotchild; 496 case -1: 497 syslog(LOG_WARNING, "fork: %m"); 498 /* FALLTHROUGH */ 499 default: 500 close(fd); 501 } 502 } 503 } 504 } else { 505 addrlen = sizeof(his_addr); 506 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 507 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 508 exit(1); 509 } 510 511 #ifdef VIRTUAL_HOSTING 512 if (his_addr.su_family == AF_INET6 && 513 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 514 family = AF_INET; 515 else 516 family = his_addr.su_family; 517 inithosts(family); 518 #endif 519 } 520 521 gotchild: 522 sa.sa_handler = SIG_DFL; 523 sigaction(SIGCHLD, &sa, NULL); 524 525 sa.sa_handler = sigurg; 526 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 527 sigaction(SIGURG, &sa, NULL); 528 529 sigfillset(&sa.sa_mask); /* block all signals in handler */ 530 sa.sa_flags = SA_RESTART; 531 sa.sa_handler = sigquit; 532 sigaction(SIGHUP, &sa, NULL); 533 sigaction(SIGINT, &sa, NULL); 534 sigaction(SIGQUIT, &sa, NULL); 535 sigaction(SIGTERM, &sa, NULL); 536 537 sa.sa_handler = lostconn; 538 sigaction(SIGPIPE, &sa, NULL); 539 540 addrlen = sizeof(ctrl_addr); 541 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 542 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 543 exit(1); 544 } 545 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 546 #ifdef VIRTUAL_HOSTING 547 /* select our identity from virtual host table */ 548 selecthost(&ctrl_addr); 549 #endif 550 #ifdef IP_TOS 551 if (ctrl_addr.su_family == AF_INET) 552 { 553 tos = IPTOS_LOWDELAY; 554 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 555 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 556 } 557 #endif 558 /* 559 * Disable Nagle on the control channel so that we don't have to wait 560 * for peer's ACK before issuing our next reply. 561 */ 562 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 563 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 564 565 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 566 567 /* set this here so klogin can use it... */ 568 snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 569 570 /* Try to handle urgent data inline */ 571 #ifdef SO_OOBINLINE 572 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 573 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 574 #endif 575 576 #ifdef F_SETOWN 577 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 578 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 579 #endif 580 dolog((struct sockaddr *)&his_addr); 581 /* 582 * Set up default state 583 */ 584 data = -1; 585 type = TYPE_A; 586 form = FORM_N; 587 stru = STRU_F; 588 mode = MODE_S; 589 tmpline[0] = '\0'; 590 591 /* If logins are disabled, print out the message. */ 592 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 593 while (fgets(line, sizeof(line), fd) != NULL) { 594 if ((cp = strchr(line, '\n')) != NULL) 595 *cp = '\0'; 596 lreply(530, "%s", line); 597 } 598 fflush(stdout); 599 fclose(fd); 600 reply(530, "System not available."); 601 exit(0); 602 } 603 #ifdef VIRTUAL_HOSTING 604 fd = fopen(thishost->welcome, "r"); 605 #else 606 fd = fopen(_PATH_FTPWELCOME, "r"); 607 #endif 608 if (fd != NULL) { 609 while (fgets(line, sizeof(line), fd) != NULL) { 610 if ((cp = strchr(line, '\n')) != NULL) 611 *cp = '\0'; 612 lreply(220, "%s", line); 613 } 614 fflush(stdout); 615 fclose(fd); 616 /* reply(220,) must follow */ 617 } 618 #ifndef VIRTUAL_HOSTING 619 if (hostname == NULL) { 620 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 621 fatalerror("Ran out of memory."); 622 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 623 hostname[0] = '\0'; 624 hostname[MAXHOSTNAMELEN - 1] = '\0'; 625 } 626 #endif 627 if (hostinfo) 628 reply(220, "%s FTP server (%s) ready.", hostname, version); 629 else 630 reply(220, "FTP server ready."); 631 for (;;) 632 yyparse(); 633 /* NOTREACHED */ 634 } 635 636 static void 637 lostconn(int signo) 638 { 639 640 if (ftpdebug) 641 syslog(LOG_DEBUG, "lost connection"); 642 dologout(1); 643 } 644 645 static void 646 sigquit(int signo) 647 { 648 649 syslog(LOG_ERR, "got signal %d", signo); 650 dologout(1); 651 } 652 653 #ifdef VIRTUAL_HOSTING 654 /* 655 * read in virtual host tables (if they exist) 656 */ 657 658 static void 659 inithosts(int family) 660 { 661 int insert; 662 size_t len; 663 FILE *fp; 664 char *cp, *mp, *line; 665 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 666 struct ftphost *hrp, *lhrp; 667 struct addrinfo hints, *res, *ai; 668 669 /* 670 * Fill in the default host information 671 */ 672 if (hostname == NULL) { 673 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 674 fatalerror("Ran out of memory."); 675 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 676 hostname[0] = '\0'; 677 hostname[MAXHOSTNAMELEN - 1] = '\0'; 678 } 679 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 680 fatalerror("Ran out of memory."); 681 hrp->hostname = hostname; 682 hrp->hostinfo = NULL; 683 684 memset(&hints, 0, sizeof(hints)); 685 hints.ai_flags = AI_PASSIVE; 686 hints.ai_family = family; 687 hints.ai_socktype = SOCK_STREAM; 688 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 689 hrp->hostinfo = res; 690 hrp->statfile = _PATH_FTPDSTATFILE; 691 hrp->welcome = _PATH_FTPWELCOME; 692 hrp->loginmsg = _PATH_FTPLOGINMESG; 693 hrp->anonuser = "ftp"; 694 hrp->next = NULL; 695 thishost = firsthost = lhrp = hrp; 696 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 697 int addrsize, gothost; 698 void *addr; 699 struct hostent *hp; 700 701 while ((line = fgetln(fp, &len)) != NULL) { 702 int i, hp_error; 703 704 /* skip comments */ 705 if (line[0] == '#') 706 continue; 707 if (line[len - 1] == '\n') { 708 line[len - 1] = '\0'; 709 mp = NULL; 710 } else { 711 if ((mp = malloc(len + 1)) == NULL) 712 fatalerror("Ran out of memory."); 713 memcpy(mp, line, len); 714 mp[len] = '\0'; 715 line = mp; 716 } 717 cp = strtok(line, " \t"); 718 /* skip empty lines */ 719 if (cp == NULL) 720 goto nextline; 721 vhost = cp; 722 723 /* set defaults */ 724 anonuser = "ftp"; 725 statfile = _PATH_FTPDSTATFILE; 726 welcome = _PATH_FTPWELCOME; 727 loginmsg = _PATH_FTPLOGINMESG; 728 729 /* 730 * Preparse the line so we can use its info 731 * for all the addresses associated with 732 * the virtual host name. 733 * Field 0, the virtual host name, is special: 734 * it's already parsed off and will be strdup'ed 735 * later, after we know its canonical form. 736 */ 737 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 738 if (*cp != '-' && (cp = strdup(cp))) 739 switch (i) { 740 case 1: /* anon user permissions */ 741 anonuser = cp; 742 break; 743 case 2: /* statistics file */ 744 statfile = cp; 745 break; 746 case 3: /* welcome message */ 747 welcome = cp; 748 break; 749 case 4: /* login message */ 750 loginmsg = cp; 751 break; 752 default: /* programming error */ 753 abort(); 754 /* NOTREACHED */ 755 } 756 757 hints.ai_flags = AI_PASSIVE; 758 hints.ai_family = family; 759 hints.ai_socktype = SOCK_STREAM; 760 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 761 goto nextline; 762 for (ai = res; ai != NULL && ai->ai_addr != NULL; 763 ai = ai->ai_next) { 764 765 gothost = 0; 766 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 767 struct addrinfo *hi; 768 769 for (hi = hrp->hostinfo; hi != NULL; 770 hi = hi->ai_next) 771 if (hi->ai_addrlen == ai->ai_addrlen && 772 memcmp(hi->ai_addr, 773 ai->ai_addr, 774 ai->ai_addr->sa_len) == 0) { 775 gothost++; 776 break; 777 } 778 if (gothost) 779 break; 780 } 781 if (hrp == NULL) { 782 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 783 goto nextline; 784 hrp->hostname = NULL; 785 insert = 1; 786 } else { 787 if (hrp->hostinfo && hrp->hostinfo != res) 788 freeaddrinfo(hrp->hostinfo); 789 insert = 0; /* host already in the chain */ 790 } 791 hrp->hostinfo = res; 792 793 /* 794 * determine hostname to use. 795 * force defined name if there is a valid alias 796 * otherwise fallback to primary hostname 797 */ 798 /* XXX: getaddrinfo() can't do alias check */ 799 switch(hrp->hostinfo->ai_family) { 800 case AF_INET: 801 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 802 addrsize = sizeof(struct in_addr); 803 break; 804 case AF_INET6: 805 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 806 addrsize = sizeof(struct in6_addr); 807 break; 808 default: 809 /* should not reach here */ 810 freeaddrinfo(hrp->hostinfo); 811 if (insert) 812 free(hrp); /*not in chain, can free*/ 813 else 814 hrp->hostinfo = NULL; /*mark as blank*/ 815 goto nextline; 816 /* NOTREACHED */ 817 } 818 if ((hp = getipnodebyaddr(addr, addrsize, 819 hrp->hostinfo->ai_family, 820 &hp_error)) != NULL) { 821 if (strcmp(vhost, hp->h_name) != 0) { 822 if (hp->h_aliases == NULL) 823 vhost = hp->h_name; 824 else { 825 i = 0; 826 while (hp->h_aliases[i] && 827 strcmp(vhost, hp->h_aliases[i]) != 0) 828 ++i; 829 if (hp->h_aliases[i] == NULL) 830 vhost = hp->h_name; 831 } 832 } 833 } 834 if (hrp->hostname && 835 strcmp(hrp->hostname, vhost) != 0) { 836 free(hrp->hostname); 837 hrp->hostname = NULL; 838 } 839 if (hrp->hostname == NULL && 840 (hrp->hostname = strdup(vhost)) == NULL) { 841 freeaddrinfo(hrp->hostinfo); 842 hrp->hostinfo = NULL; /* mark as blank */ 843 if (hp) 844 freehostent(hp); 845 goto nextline; 846 } 847 hrp->anonuser = anonuser; 848 hrp->statfile = statfile; 849 hrp->welcome = welcome; 850 hrp->loginmsg = loginmsg; 851 if (insert) { 852 hrp->next = NULL; 853 lhrp->next = hrp; 854 lhrp = hrp; 855 } 856 if (hp) 857 freehostent(hp); 858 } 859 nextline: 860 if (mp) 861 free(mp); 862 } 863 fclose(fp); 864 } 865 } 866 867 static void 868 selecthost(union sockunion *su) 869 { 870 struct ftphost *hrp; 871 u_int16_t port; 872 #ifdef INET6 873 struct in6_addr *mapped_in6 = NULL; 874 #endif 875 struct addrinfo *hi; 876 877 #ifdef INET6 878 /* 879 * XXX IPv4 mapped IPv6 addr consideraton, 880 * specified in rfc2373. 881 */ 882 if (su->su_family == AF_INET6 && 883 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 884 mapped_in6 = &su->su_sin6.sin6_addr; 885 #endif 886 887 hrp = thishost = firsthost; /* default */ 888 port = su->su_port; 889 su->su_port = 0; 890 while (hrp != NULL) { 891 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 892 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 893 thishost = hrp; 894 goto found; 895 } 896 #ifdef INET6 897 /* XXX IPv4 mapped IPv6 addr consideraton */ 898 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 899 (memcmp(&mapped_in6->s6_addr[12], 900 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 901 sizeof(struct in_addr)) == 0)) { 902 thishost = hrp; 903 goto found; 904 } 905 #endif 906 } 907 hrp = hrp->next; 908 } 909 found: 910 su->su_port = port; 911 /* setup static variables as appropriate */ 912 hostname = thishost->hostname; 913 ftpuser = thishost->anonuser; 914 } 915 #endif 916 917 /* 918 * Helper function for sgetpwnam(). 919 */ 920 static char * 921 sgetsave(char *s) 922 { 923 char *new = malloc(strlen(s) + 1); 924 925 if (new == NULL) { 926 reply(421, "Ran out of memory."); 927 dologout(1); 928 /* NOTREACHED */ 929 } 930 strcpy(new, s); 931 return (new); 932 } 933 934 /* 935 * Save the result of a getpwnam. Used for USER command, since 936 * the data returned must not be clobbered by any other command 937 * (e.g., globbing). 938 * NB: The data returned by sgetpwnam() will remain valid until 939 * the next call to this function. Its difference from getpwnam() 940 * is that sgetpwnam() is known to be called from ftpd code only. 941 */ 942 static struct passwd * 943 sgetpwnam(char *name) 944 { 945 static struct passwd save; 946 struct passwd *p; 947 948 if ((p = getpwnam(name)) == NULL) 949 return (p); 950 if (save.pw_name) { 951 free(save.pw_name); 952 free(save.pw_passwd); 953 free(save.pw_gecos); 954 free(save.pw_dir); 955 free(save.pw_shell); 956 } 957 save = *p; 958 save.pw_name = sgetsave(p->pw_name); 959 save.pw_passwd = sgetsave(p->pw_passwd); 960 save.pw_gecos = sgetsave(p->pw_gecos); 961 save.pw_dir = sgetsave(p->pw_dir); 962 save.pw_shell = sgetsave(p->pw_shell); 963 return (&save); 964 } 965 966 static int login_attempts; /* number of failed login attempts */ 967 static int askpasswd; /* had user command, ask for passwd */ 968 static char curname[MAXLOGNAME]; /* current USER name */ 969 970 /* 971 * USER command. 972 * Sets global passwd pointer pw if named account exists and is acceptable; 973 * sets askpasswd if a PASS command is expected. If logged in previously, 974 * need to reset state. If name is "ftp" or "anonymous", the name is not in 975 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 976 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 977 * requesting login privileges. Disallow anyone who does not have a standard 978 * shell as returned by getusershell(). Disallow anyone mentioned in the file 979 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 980 */ 981 void 982 user(char *name) 983 { 984 char *cp, *shell; 985 986 if (logged_in) { 987 if (guest) { 988 reply(530, "Can't change user from guest login."); 989 return; 990 } else if (dochroot) { 991 reply(530, "Can't change user from chroot user."); 992 return; 993 } 994 end_login(); 995 } 996 997 guest = 0; 998 #ifdef VIRTUAL_HOSTING 999 pw = sgetpwnam(thishost->anonuser); 1000 #else 1001 pw = sgetpwnam("ftp"); 1002 #endif 1003 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1004 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 1005 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 1006 reply(530, "User %s access denied.", name); 1007 else if (pw != NULL) { 1008 guest = 1; 1009 askpasswd = 1; 1010 reply(331, 1011 "Guest login ok, send your email address as password."); 1012 } else 1013 reply(530, "User %s unknown.", name); 1014 if (!askpasswd && logging) 1015 syslog(LOG_NOTICE, 1016 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1017 return; 1018 } 1019 if (anon_only != 0) { 1020 reply(530, "Sorry, only anonymous ftp allowed."); 1021 return; 1022 } 1023 1024 if ((pw = sgetpwnam(name))) { 1025 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1026 shell = _PATH_BSHELL; 1027 setusershell(); 1028 while ((cp = getusershell()) != NULL) 1029 if (strcmp(cp, shell) == 0) 1030 break; 1031 endusershell(); 1032 1033 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1034 reply(530, "User %s access denied.", name); 1035 if (logging) 1036 syslog(LOG_NOTICE, 1037 "FTP LOGIN REFUSED FROM %s, %s", 1038 remotehost, name); 1039 pw = NULL; 1040 return; 1041 } 1042 } 1043 if (logging) 1044 strncpy(curname, name, sizeof(curname)-1); 1045 1046 pwok = 0; 1047 #ifdef USE_PAM 1048 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1049 #endif 1050 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1051 pwok = (pw != NULL) && 1052 opieaccessfile(remotehost) && 1053 opiealways(pw->pw_dir); 1054 reply(331, "Response to %s %s for %s.", 1055 opieprompt, pwok ? "requested" : "required", name); 1056 } else { 1057 pwok = 1; 1058 reply(331, "Password required for %s.", name); 1059 } 1060 askpasswd = 1; 1061 /* 1062 * Delay before reading passwd after first failed 1063 * attempt to slow down passwd-guessing programs. 1064 */ 1065 if (login_attempts) 1066 sleep(login_attempts); 1067 } 1068 1069 /* 1070 * Check if a user is in the file "fname", 1071 * return a pointer to a malloc'd string with the rest 1072 * of the matching line in "residue" if not NULL. 1073 */ 1074 static int 1075 checkuser(char *fname, char *name, int pwset, char **residue) 1076 { 1077 FILE *fd; 1078 int found = 0; 1079 size_t len; 1080 char *line, *mp, *p; 1081 1082 if ((fd = fopen(fname, "r")) != NULL) { 1083 while (!found && (line = fgetln(fd, &len)) != NULL) { 1084 /* skip comments */ 1085 if (line[0] == '#') 1086 continue; 1087 if (line[len - 1] == '\n') { 1088 line[len - 1] = '\0'; 1089 mp = NULL; 1090 } else { 1091 if ((mp = malloc(len + 1)) == NULL) 1092 fatalerror("Ran out of memory."); 1093 memcpy(mp, line, len); 1094 mp[len] = '\0'; 1095 line = mp; 1096 } 1097 /* avoid possible leading and trailing whitespace */ 1098 p = strtok(line, " \t"); 1099 /* skip empty lines */ 1100 if (p == NULL) 1101 goto nextline; 1102 /* 1103 * if first chr is '@', check group membership 1104 */ 1105 if (p[0] == '@') { 1106 int i = 0; 1107 struct group *grp; 1108 1109 if (p[1] == '\0') /* single @ matches anyone */ 1110 found = 1; 1111 else { 1112 if ((grp = getgrnam(p+1)) == NULL) 1113 goto nextline; 1114 /* 1115 * Check user's default group 1116 */ 1117 if (pwset && grp->gr_gid == pw->pw_gid) 1118 found = 1; 1119 /* 1120 * Check supplementary groups 1121 */ 1122 while (!found && grp->gr_mem[i]) 1123 found = strcmp(name, 1124 grp->gr_mem[i++]) 1125 == 0; 1126 } 1127 } 1128 /* 1129 * Otherwise, just check for username match 1130 */ 1131 else 1132 found = strcmp(p, name) == 0; 1133 /* 1134 * Save the rest of line to "residue" if matched 1135 */ 1136 if (found && residue) { 1137 if ((p = strtok(NULL, "")) != NULL) 1138 p += strspn(p, " \t"); 1139 if (p && *p) { 1140 if ((*residue = strdup(p)) == NULL) 1141 fatalerror("Ran out of memory."); 1142 } else 1143 *residue = NULL; 1144 } 1145 nextline: 1146 if (mp) 1147 free(mp); 1148 } 1149 fclose(fd); 1150 } 1151 return (found); 1152 } 1153 1154 /* 1155 * Terminate login as previous user, if any, resetting state; 1156 * used when USER command is given or login fails. 1157 */ 1158 static void 1159 end_login(void) 1160 { 1161 #ifdef USE_PAM 1162 int e; 1163 #endif 1164 1165 seteuid(0); 1166 if (logged_in && dowtmp) 1167 ftpd_logwtmp(ttyline, "", NULL); 1168 pw = NULL; 1169 #ifdef LOGIN_CAP 1170 /* XXX Missing LOGIN_SETMAC */ 1171 setusercontext(NULL, getpwuid(0), 0, 1172 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1173 #endif 1174 #ifdef USE_PAM 1175 if (pamh) { 1176 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1177 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1178 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1179 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1180 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1181 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1182 pamh = NULL; 1183 } 1184 #endif 1185 logged_in = 0; 1186 guest = 0; 1187 dochroot = 0; 1188 } 1189 1190 #ifdef USE_PAM 1191 1192 /* 1193 * the following code is stolen from imap-uw PAM authentication module and 1194 * login.c 1195 */ 1196 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1197 1198 struct cred_t { 1199 const char *uname; /* user name */ 1200 const char *pass; /* password */ 1201 }; 1202 typedef struct cred_t cred_t; 1203 1204 static int 1205 auth_conv(int num_msg, const struct pam_message **msg, 1206 struct pam_response **resp, void *appdata) 1207 { 1208 int i; 1209 cred_t *cred = (cred_t *) appdata; 1210 struct pam_response *reply; 1211 1212 reply = calloc(num_msg, sizeof *reply); 1213 if (reply == NULL) 1214 return PAM_BUF_ERR; 1215 1216 for (i = 0; i < num_msg; i++) { 1217 switch (msg[i]->msg_style) { 1218 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1219 reply[i].resp_retcode = PAM_SUCCESS; 1220 reply[i].resp = COPY_STRING(cred->uname); 1221 /* PAM frees resp. */ 1222 break; 1223 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1224 reply[i].resp_retcode = PAM_SUCCESS; 1225 reply[i].resp = COPY_STRING(cred->pass); 1226 /* PAM frees resp. */ 1227 break; 1228 case PAM_TEXT_INFO: 1229 case PAM_ERROR_MSG: 1230 reply[i].resp_retcode = PAM_SUCCESS; 1231 reply[i].resp = NULL; 1232 break; 1233 default: /* unknown message style */ 1234 free(reply); 1235 return PAM_CONV_ERR; 1236 } 1237 } 1238 1239 *resp = reply; 1240 return PAM_SUCCESS; 1241 } 1242 1243 /* 1244 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1245 * authenticated, or 1 if not authenticated. If some sort of PAM system 1246 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1247 * function returns -1. This can be used as an indication that we should 1248 * fall back to a different authentication mechanism. 1249 */ 1250 static int 1251 auth_pam(struct passwd **ppw, const char *pass) 1252 { 1253 const char *tmpl_user; 1254 const void *item; 1255 int rval; 1256 int e; 1257 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1258 struct pam_conv conv = { &auth_conv, &auth_cred }; 1259 1260 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1261 if (e != PAM_SUCCESS) { 1262 /* 1263 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1264 * if context creation has failed in the first place. 1265 */ 1266 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1267 return -1; 1268 } 1269 1270 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1271 if (e != PAM_SUCCESS) { 1272 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1273 pam_strerror(pamh, e)); 1274 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1275 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1276 } 1277 pamh = NULL; 1278 return -1; 1279 } 1280 1281 e = pam_authenticate(pamh, 0); 1282 switch (e) { 1283 case PAM_SUCCESS: 1284 /* 1285 * With PAM we support the concept of a "template" 1286 * user. The user enters a login name which is 1287 * authenticated by PAM, usually via a remote service 1288 * such as RADIUS or TACACS+. If authentication 1289 * succeeds, a different but related "template" name 1290 * is used for setting the credentials, shell, and 1291 * home directory. The name the user enters need only 1292 * exist on the remote authentication server, but the 1293 * template name must be present in the local password 1294 * database. 1295 * 1296 * This is supported by two various mechanisms in the 1297 * individual modules. However, from the application's 1298 * point of view, the template user is always passed 1299 * back as a changed value of the PAM_USER item. 1300 */ 1301 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1302 PAM_SUCCESS) { 1303 tmpl_user = (const char *) item; 1304 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1305 *ppw = getpwnam(tmpl_user); 1306 } else 1307 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1308 pam_strerror(pamh, e)); 1309 rval = 0; 1310 break; 1311 1312 case PAM_AUTH_ERR: 1313 case PAM_USER_UNKNOWN: 1314 case PAM_MAXTRIES: 1315 rval = 1; 1316 break; 1317 1318 default: 1319 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1320 rval = -1; 1321 break; 1322 } 1323 1324 if (rval == 0) { 1325 e = pam_acct_mgmt(pamh, 0); 1326 if (e != PAM_SUCCESS) { 1327 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1328 pam_strerror(pamh, e)); 1329 rval = 1; 1330 } 1331 } 1332 1333 if (rval != 0) { 1334 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1335 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1336 } 1337 pamh = NULL; 1338 } 1339 return rval; 1340 } 1341 1342 #endif /* USE_PAM */ 1343 1344 void 1345 pass(char *passwd) 1346 { 1347 int rval; 1348 FILE *fd; 1349 #ifdef LOGIN_CAP 1350 login_cap_t *lc = NULL; 1351 #endif 1352 #ifdef USE_PAM 1353 int e; 1354 #endif 1355 char *residue = NULL; 1356 char *xpasswd; 1357 1358 if (logged_in || askpasswd == 0) { 1359 reply(503, "Login with USER first."); 1360 return; 1361 } 1362 askpasswd = 0; 1363 if (!guest) { /* "ftp" is only account allowed no password */ 1364 if (pw == NULL) { 1365 rval = 1; /* failure below */ 1366 goto skip; 1367 } 1368 #ifdef USE_PAM 1369 rval = auth_pam(&pw, passwd); 1370 if (rval >= 0) { 1371 opieunlock(); 1372 goto skip; 1373 } 1374 #endif 1375 if (opieverify(&opiedata, passwd) == 0) 1376 xpasswd = pw->pw_passwd; 1377 else if (pwok) { 1378 xpasswd = crypt(passwd, pw->pw_passwd); 1379 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1380 xpasswd = ":"; 1381 } else { 1382 rval = 1; 1383 goto skip; 1384 } 1385 rval = strcmp(pw->pw_passwd, xpasswd); 1386 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1387 rval = 1; /* failure */ 1388 skip: 1389 /* 1390 * If rval == 1, the user failed the authentication check 1391 * above. If rval == 0, either PAM or local authentication 1392 * succeeded. 1393 */ 1394 if (rval) { 1395 reply(530, "Login incorrect."); 1396 if (logging) { 1397 syslog(LOG_NOTICE, 1398 "FTP LOGIN FAILED FROM %s", 1399 remotehost); 1400 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1401 "FTP LOGIN FAILED FROM %s, %s", 1402 remotehost, curname); 1403 } 1404 pw = NULL; 1405 if (login_attempts++ >= 5) { 1406 syslog(LOG_NOTICE, 1407 "repeated login failures from %s", 1408 remotehost); 1409 exit(0); 1410 } 1411 return; 1412 } 1413 } 1414 login_attempts = 0; /* this time successful */ 1415 if (setegid(pw->pw_gid) < 0) { 1416 reply(550, "Can't set gid."); 1417 return; 1418 } 1419 /* May be overridden by login.conf */ 1420 umask(defumask); 1421 #ifdef LOGIN_CAP 1422 if ((lc = login_getpwclass(pw)) != NULL) { 1423 char remote_ip[NI_MAXHOST]; 1424 1425 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1426 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1427 NI_NUMERICHOST)) 1428 *remote_ip = 0; 1429 remote_ip[sizeof(remote_ip) - 1] = 0; 1430 if (!auth_hostok(lc, remotehost, remote_ip)) { 1431 syslog(LOG_INFO|LOG_AUTH, 1432 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1433 pw->pw_name); 1434 reply(530, "Permission denied."); 1435 pw = NULL; 1436 return; 1437 } 1438 if (!auth_timeok(lc, time(NULL))) { 1439 reply(530, "Login not available right now."); 1440 pw = NULL; 1441 return; 1442 } 1443 } 1444 /* XXX Missing LOGIN_SETMAC */ 1445 setusercontext(lc, pw, 0, 1446 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1447 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1448 #else 1449 setlogin(pw->pw_name); 1450 initgroups(pw->pw_name, pw->pw_gid); 1451 #endif 1452 1453 #ifdef USE_PAM 1454 if (pamh) { 1455 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1456 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1457 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1458 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1459 } 1460 } 1461 #endif 1462 1463 /* open wtmp before chroot */ 1464 if (dowtmp) 1465 ftpd_logwtmp(ttyline, pw->pw_name, 1466 (struct sockaddr *)&his_addr); 1467 logged_in = 1; 1468 1469 if (guest && stats && statfd < 0) 1470 #ifdef VIRTUAL_HOSTING 1471 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1472 #else 1473 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1474 #endif 1475 if (statfd < 0) 1476 stats = 0; 1477 1478 dochroot = 1479 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1480 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1481 || login_getcapbool(lc, "ftp-chroot", 0) 1482 #endif 1483 ; 1484 chrootdir = NULL; 1485 /* 1486 * For a chrooted local user, 1487 * a) see whether ftpchroot(5) specifies a chroot directory, 1488 * b) extract the directory pathname from the line, 1489 * c) expand it to the absolute pathname if necessary. 1490 */ 1491 if (dochroot && residue && 1492 (chrootdir = strtok(residue, " \t")) != NULL) { 1493 if (chrootdir[0] != '/') 1494 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1495 else 1496 chrootdir = strdup(chrootdir); /* make it permanent */ 1497 if (chrootdir == NULL) 1498 fatalerror("Ran out of memory."); 1499 } 1500 if (guest || dochroot) { 1501 /* 1502 * If no chroot directory set yet, use the login directory. 1503 * Copy it so it can be modified while pw->pw_dir stays intact. 1504 */ 1505 if (chrootdir == NULL && 1506 (chrootdir = strdup(pw->pw_dir)) == NULL) 1507 fatalerror("Ran out of memory."); 1508 /* 1509 * Check for the "/chroot/./home" syntax, 1510 * separate the chroot and home directory pathnames. 1511 */ 1512 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1513 *(homedir++) = '\0'; /* wipe '/' */ 1514 homedir++; /* skip '.' */ 1515 } else { 1516 /* 1517 * We MUST do a chdir() after the chroot. Otherwise 1518 * the old current directory will be accessible as "." 1519 * outside the new root! 1520 */ 1521 homedir = "/"; 1522 } 1523 /* 1524 * Finally, do chroot() 1525 */ 1526 if (chroot(chrootdir) < 0) { 1527 reply(550, "Can't change root."); 1528 goto bad; 1529 } 1530 } else /* real user w/o chroot */ 1531 homedir = pw->pw_dir; 1532 /* 1533 * Set euid *before* doing chdir() so 1534 * a) the user won't be carried to a directory that he couldn't reach 1535 * on his own due to no permission to upper path components, 1536 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1537 * (uid 0 has no root power over NFS if not mapped explicitly.) 1538 */ 1539 if (seteuid(pw->pw_uid) < 0) { 1540 reply(550, "Can't set uid."); 1541 goto bad; 1542 } 1543 if (chdir(homedir) < 0) { 1544 if (guest || dochroot) { 1545 reply(550, "Can't change to base directory."); 1546 goto bad; 1547 } else { 1548 if (chdir("/") < 0) { 1549 reply(550, "Root is inaccessible."); 1550 goto bad; 1551 } 1552 lreply(230, "No directory! Logging in with home=/."); 1553 } 1554 } 1555 1556 /* 1557 * Display a login message, if it exists. 1558 * N.B. reply(230,) must follow the message. 1559 */ 1560 #ifdef VIRTUAL_HOSTING 1561 fd = fopen(thishost->loginmsg, "r"); 1562 #else 1563 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1564 #endif 1565 if (fd != NULL) { 1566 char *cp, line[LINE_MAX]; 1567 1568 while (fgets(line, sizeof(line), fd) != NULL) { 1569 if ((cp = strchr(line, '\n')) != NULL) 1570 *cp = '\0'; 1571 lreply(230, "%s", line); 1572 } 1573 fflush(stdout); 1574 fclose(fd); 1575 } 1576 if (guest) { 1577 if (ident != NULL) 1578 free(ident); 1579 ident = strdup(passwd); 1580 if (ident == NULL) 1581 fatalerror("Ran out of memory."); 1582 1583 reply(230, "Guest login ok, access restrictions apply."); 1584 #ifdef SETPROCTITLE 1585 #ifdef VIRTUAL_HOSTING 1586 if (thishost != firsthost) 1587 snprintf(proctitle, sizeof(proctitle), 1588 "%s: anonymous(%s)/%s", remotehost, hostname, 1589 passwd); 1590 else 1591 #endif 1592 snprintf(proctitle, sizeof(proctitle), 1593 "%s: anonymous/%s", remotehost, passwd); 1594 setproctitle("%s", proctitle); 1595 #endif /* SETPROCTITLE */ 1596 if (logging) 1597 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1598 remotehost, passwd); 1599 } else { 1600 if (dochroot) 1601 reply(230, "User %s logged in, " 1602 "access restrictions apply.", pw->pw_name); 1603 else 1604 reply(230, "User %s logged in.", pw->pw_name); 1605 1606 #ifdef SETPROCTITLE 1607 snprintf(proctitle, sizeof(proctitle), 1608 "%s: user/%s", remotehost, pw->pw_name); 1609 setproctitle("%s", proctitle); 1610 #endif /* SETPROCTITLE */ 1611 if (logging) 1612 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1613 remotehost, pw->pw_name); 1614 } 1615 if (logging && (guest || dochroot)) 1616 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1617 #ifdef LOGIN_CAP 1618 login_close(lc); 1619 #endif 1620 if (residue) 1621 free(residue); 1622 return; 1623 bad: 1624 /* Forget all about it... */ 1625 #ifdef LOGIN_CAP 1626 login_close(lc); 1627 #endif 1628 if (residue) 1629 free(residue); 1630 end_login(); 1631 } 1632 1633 void 1634 retrieve(char *cmd, char *name) 1635 { 1636 FILE *fin, *dout; 1637 struct stat st; 1638 int (*closefunc)(FILE *); 1639 time_t start; 1640 1641 if (cmd == NULL) { 1642 fin = fopen(name, "r"), closefunc = fclose; 1643 st.st_size = 0; 1644 } else { 1645 char line[BUFSIZ]; 1646 1647 snprintf(line, sizeof(line), cmd, name), name = line; 1648 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1649 st.st_size = -1; 1650 st.st_blksize = BUFSIZ; 1651 } 1652 if (fin == NULL) { 1653 if (errno != 0) { 1654 perror_reply(550, name); 1655 if (cmd == NULL) { 1656 LOGCMD("get", name); 1657 } 1658 } 1659 return; 1660 } 1661 byte_count = -1; 1662 if (cmd == NULL) { 1663 if (fstat(fileno(fin), &st) < 0) { 1664 perror_reply(550, name); 1665 goto done; 1666 } 1667 if (!S_ISREG(st.st_mode)) { 1668 /* 1669 * Never sending a raw directory is a workaround 1670 * for buggy clients that will attempt to RETR 1671 * a directory before listing it, e.g., Mozilla. 1672 * Preventing a guest from getting irregular files 1673 * is a simple security measure. 1674 */ 1675 if (S_ISDIR(st.st_mode) || guest) { 1676 reply(550, "%s: not a plain file.", name); 1677 goto done; 1678 } 1679 st.st_size = -1; 1680 /* st.st_blksize is set for all descriptor types */ 1681 } 1682 } 1683 if (restart_point) { 1684 if (type == TYPE_A) { 1685 off_t i, n; 1686 int c; 1687 1688 n = restart_point; 1689 i = 0; 1690 while (i++ < n) { 1691 if ((c=getc(fin)) == EOF) { 1692 perror_reply(550, name); 1693 goto done; 1694 } 1695 if (c == '\n') 1696 i++; 1697 } 1698 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1699 perror_reply(550, name); 1700 goto done; 1701 } 1702 } 1703 dout = dataconn(name, st.st_size, "w"); 1704 if (dout == NULL) 1705 goto done; 1706 time(&start); 1707 send_data(fin, dout, st.st_blksize, st.st_size, 1708 restart_point == 0 && cmd == NULL && S_ISREG(st.st_mode)); 1709 if (cmd == NULL && guest && stats && byte_count > 0) 1710 logxfer(name, byte_count, start); 1711 fclose(dout); 1712 data = -1; 1713 pdata = -1; 1714 done: 1715 if (cmd == NULL) 1716 LOGBYTES("get", name, byte_count); 1717 (*closefunc)(fin); 1718 } 1719 1720 void 1721 store(char *name, char *mode, int unique) 1722 { 1723 int fd; 1724 FILE *fout, *din; 1725 int (*closefunc)(FILE *); 1726 1727 if (*mode == 'a') { /* APPE */ 1728 if (unique) { 1729 /* Programming error */ 1730 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1731 unique = 0; 1732 } 1733 if (guest && noguestmod) { 1734 reply(550, "Appending to existing file denied."); 1735 goto err; 1736 } 1737 restart_point = 0; /* not affected by preceding REST */ 1738 } 1739 if (unique) /* STOU overrides REST */ 1740 restart_point = 0; 1741 if (guest && noguestmod) { 1742 if (restart_point) { /* guest STOR w/REST */ 1743 reply(550, "Modifying existing file denied."); 1744 goto err; 1745 } else /* treat guest STOR as STOU */ 1746 unique = 1; 1747 } 1748 1749 if (restart_point) 1750 mode = "r+"; /* so ASCII manual seek can work */ 1751 if (unique) { 1752 if ((fd = guniquefd(name, &name)) < 0) 1753 goto err; 1754 fout = fdopen(fd, mode); 1755 } else 1756 fout = fopen(name, mode); 1757 closefunc = fclose; 1758 if (fout == NULL) { 1759 perror_reply(553, name); 1760 goto err; 1761 } 1762 byte_count = -1; 1763 if (restart_point) { 1764 if (type == TYPE_A) { 1765 off_t i, n; 1766 int c; 1767 1768 n = restart_point; 1769 i = 0; 1770 while (i++ < n) { 1771 if ((c=getc(fout)) == EOF) { 1772 perror_reply(550, name); 1773 goto done; 1774 } 1775 if (c == '\n') 1776 i++; 1777 } 1778 /* 1779 * We must do this seek to "current" position 1780 * because we are changing from reading to 1781 * writing. 1782 */ 1783 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1784 perror_reply(550, name); 1785 goto done; 1786 } 1787 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1788 perror_reply(550, name); 1789 goto done; 1790 } 1791 } 1792 din = dataconn(name, -1, "r"); 1793 if (din == NULL) 1794 goto done; 1795 if (receive_data(din, fout) == 0) { 1796 if (unique) 1797 reply(226, "Transfer complete (unique file name:%s).", 1798 name); 1799 else 1800 reply(226, "Transfer complete."); 1801 } 1802 fclose(din); 1803 data = -1; 1804 pdata = -1; 1805 done: 1806 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1807 (*closefunc)(fout); 1808 return; 1809 err: 1810 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1811 return; 1812 } 1813 1814 static FILE * 1815 getdatasock(char *mode) 1816 { 1817 int on = 1, s, t, tries; 1818 1819 if (data >= 0) 1820 return (fdopen(data, mode)); 1821 1822 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1823 if (s < 0) 1824 goto bad; 1825 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1826 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1827 /* anchor socket to avoid multi-homing problems */ 1828 data_source = ctrl_addr; 1829 data_source.su_port = htons(dataport); 1830 seteuid(0); 1831 for (tries = 1; ; tries++) { 1832 /* 1833 * We should loop here since it's possible that 1834 * another ftpd instance has passed this point and is 1835 * trying to open a data connection in active mode now. 1836 * Until the other connection is opened, we'll be getting 1837 * EADDRINUSE because no SOCK_STREAM sockets in the system 1838 * can share both local and remote addresses, localIP:20 1839 * and *:* in this case. 1840 */ 1841 if (bind(s, (struct sockaddr *)&data_source, 1842 data_source.su_len) >= 0) 1843 break; 1844 if (errno != EADDRINUSE || tries > 10) 1845 goto bad; 1846 sleep(tries); 1847 } 1848 seteuid(pw->pw_uid); 1849 #ifdef IP_TOS 1850 if (data_source.su_family == AF_INET) 1851 { 1852 on = IPTOS_THROUGHPUT; 1853 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1854 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1855 } 1856 #endif 1857 #ifdef TCP_NOPUSH 1858 /* 1859 * Turn off push flag to keep sender TCP from sending short packets 1860 * at the boundaries of each write(). 1861 */ 1862 on = 1; 1863 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1864 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1865 #endif 1866 return (fdopen(s, mode)); 1867 bad: 1868 /* Return the real value of errno (close may change it) */ 1869 t = errno; 1870 seteuid(pw->pw_uid); 1871 close(s); 1872 errno = t; 1873 return (NULL); 1874 } 1875 1876 static FILE * 1877 dataconn(char *name, off_t size, char *mode) 1878 { 1879 char sizebuf[32]; 1880 FILE *file; 1881 int retry = 0, tos, conerrno; 1882 1883 file_size = size; 1884 byte_count = 0; 1885 if (size != -1) 1886 snprintf(sizebuf, sizeof(sizebuf), 1887 " (%jd bytes)", (intmax_t)size); 1888 else 1889 *sizebuf = '\0'; 1890 if (pdata >= 0) { 1891 union sockunion from; 1892 socklen_t fromlen = ctrl_addr.su_len; 1893 int flags, s; 1894 struct timeval timeout; 1895 fd_set set; 1896 1897 FD_ZERO(&set); 1898 FD_SET(pdata, &set); 1899 1900 timeout.tv_usec = 0; 1901 timeout.tv_sec = 120; 1902 1903 /* 1904 * Granted a socket is in the blocking I/O mode, 1905 * accept() will block after a successful select() 1906 * if the selected connection dies in between. 1907 * Therefore set the non-blocking I/O flag here. 1908 */ 1909 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1910 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1911 goto pdata_err; 1912 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1913 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1914 goto pdata_err; 1915 close(pdata); 1916 pdata = s; 1917 /* 1918 * Unset the inherited non-blocking I/O flag 1919 * on the child socket so stdio can work on it. 1920 */ 1921 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1922 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1923 goto pdata_err; 1924 #ifdef IP_TOS 1925 if (from.su_family == AF_INET) 1926 { 1927 tos = IPTOS_THROUGHPUT; 1928 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1929 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1930 } 1931 #endif 1932 reply(150, "Opening %s mode data connection for '%s'%s.", 1933 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1934 return (fdopen(pdata, mode)); 1935 pdata_err: 1936 reply(425, "Can't open data connection."); 1937 close(pdata); 1938 pdata = -1; 1939 return (NULL); 1940 } 1941 if (data >= 0) { 1942 reply(125, "Using existing data connection for '%s'%s.", 1943 name, sizebuf); 1944 usedefault = 1; 1945 return (fdopen(data, mode)); 1946 } 1947 if (usedefault) 1948 data_dest = his_addr; 1949 usedefault = 1; 1950 do { 1951 file = getdatasock(mode); 1952 if (file == NULL) { 1953 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1954 1955 if (getnameinfo((struct sockaddr *)&data_source, 1956 data_source.su_len, 1957 hostbuf, sizeof(hostbuf) - 1, 1958 portbuf, sizeof(portbuf) - 1, 1959 NI_NUMERICHOST|NI_NUMERICSERV)) 1960 *hostbuf = *portbuf = 0; 1961 hostbuf[sizeof(hostbuf) - 1] = 0; 1962 portbuf[sizeof(portbuf) - 1] = 0; 1963 reply(425, "Can't create data socket (%s,%s): %s.", 1964 hostbuf, portbuf, strerror(errno)); 1965 return (NULL); 1966 } 1967 data = fileno(file); 1968 conerrno = 0; 1969 if (connect(data, (struct sockaddr *)&data_dest, 1970 data_dest.su_len) == 0) 1971 break; 1972 conerrno = errno; 1973 fclose(file); 1974 data = -1; 1975 if (conerrno == EADDRINUSE) { 1976 sleep(swaitint); 1977 retry += swaitint; 1978 } else { 1979 break; 1980 } 1981 } while (retry <= swaitmax); 1982 if (conerrno != 0) { 1983 reply(425, "Can't build data connection: %s.", 1984 strerror(conerrno)); 1985 return (NULL); 1986 } 1987 reply(150, "Opening %s mode data connection for '%s'%s.", 1988 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1989 return (file); 1990 } 1991 1992 /* 1993 * A helper macro to avoid code duplication 1994 * in send_data() and receive_data(). 1995 * 1996 * XXX We have to block SIGURG during putc() because BSD stdio 1997 * is unable to restart interrupted write operations and hence 1998 * the entire buffer contents will be lost as soon as a write() 1999 * call indicates EINTR to stdio. 2000 */ 2001 #define FTPD_PUTC(ch, file, label) \ 2002 do { \ 2003 int ret; \ 2004 \ 2005 do { \ 2006 START_UNSAFE; \ 2007 ret = putc((ch), (file)); \ 2008 END_UNSAFE; \ 2009 CHECKOOB(return (-1)) \ 2010 else if (ferror(file)) \ 2011 goto label; \ 2012 clearerr(file); \ 2013 } while (ret == EOF); \ 2014 } while (0) 2015 2016 /* 2017 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2018 * encapsulation of the data subject to Mode, Structure, and Type. 2019 * 2020 * NB: Form isn't handled. 2021 */ 2022 static int 2023 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2024 { 2025 int c, cp, filefd, netfd; 2026 char *buf; 2027 2028 STARTXFER; 2029 2030 switch (type) { 2031 2032 case TYPE_A: 2033 cp = EOF; 2034 for (;;) { 2035 c = getc(instr); 2036 CHECKOOB(return (-1)) 2037 else if (c == EOF && ferror(instr)) 2038 goto file_err; 2039 if (c == EOF) { 2040 if (ferror(instr)) { /* resume after OOB */ 2041 clearerr(instr); 2042 continue; 2043 } 2044 if (feof(instr)) /* EOF */ 2045 break; 2046 syslog(LOG_ERR, "Internal: impossible condition" 2047 " on file after getc()"); 2048 goto file_err; 2049 } 2050 if (c == '\n' && cp != '\r') { 2051 FTPD_PUTC('\r', outstr, data_err); 2052 byte_count++; 2053 } 2054 FTPD_PUTC(c, outstr, data_err); 2055 byte_count++; 2056 cp = c; 2057 } 2058 #ifdef notyet /* BSD stdio isn't ready for that */ 2059 while (fflush(outstr) == EOF) { 2060 CHECKOOB(return (-1)) 2061 else 2062 goto data_err; 2063 clearerr(outstr); 2064 } 2065 ENDXFER; 2066 #else 2067 ENDXFER; 2068 if (fflush(outstr) == EOF) 2069 goto data_err; 2070 #endif 2071 reply(226, "Transfer complete."); 2072 return (0); 2073 2074 case TYPE_I: 2075 case TYPE_L: 2076 /* 2077 * isreg is only set if we are not doing restart and we 2078 * are sending a regular file 2079 */ 2080 netfd = fileno(outstr); 2081 filefd = fileno(instr); 2082 2083 if (isreg) { 2084 char *msg = "Transfer complete."; 2085 off_t cnt, offset; 2086 int err; 2087 2088 cnt = offset = 0; 2089 2090 while (filesize > 0) { 2091 err = sendfile(filefd, netfd, offset, 0, 2092 NULL, &cnt, 0); 2093 /* 2094 * Calculate byte_count before OOB processing. 2095 * It can be used in myoob() later. 2096 */ 2097 byte_count += cnt; 2098 offset += cnt; 2099 filesize -= cnt; 2100 CHECKOOB(return (-1)) 2101 else if (err == -1) { 2102 if (errno != EINTR && 2103 cnt == 0 && offset == 0) 2104 goto oldway; 2105 goto data_err; 2106 } 2107 if (err == -1) /* resume after OOB */ 2108 continue; 2109 /* 2110 * We hit the EOF prematurely. 2111 * Perhaps the file was externally truncated. 2112 */ 2113 if (cnt == 0) { 2114 msg = "Transfer finished due to " 2115 "premature end of file."; 2116 break; 2117 } 2118 } 2119 ENDXFER; 2120 reply(226, msg); 2121 return (0); 2122 } 2123 2124 oldway: 2125 if ((buf = malloc(blksize)) == NULL) { 2126 ENDXFER; 2127 reply(451, "Ran out of memory."); 2128 return (-1); 2129 } 2130 2131 for (;;) { 2132 int cnt, len; 2133 char *bp; 2134 2135 cnt = read(filefd, buf, blksize); 2136 CHECKOOB(free(buf); return (-1)) 2137 else if (cnt < 0) { 2138 free(buf); 2139 goto file_err; 2140 } 2141 if (cnt < 0) /* resume after OOB */ 2142 continue; 2143 if (cnt == 0) /* EOF */ 2144 break; 2145 for (len = cnt, bp = buf; len > 0;) { 2146 cnt = write(netfd, bp, len); 2147 CHECKOOB(free(buf); return (-1)) 2148 else if (cnt < 0) { 2149 free(buf); 2150 goto data_err; 2151 } 2152 if (cnt <= 0) 2153 continue; 2154 len -= cnt; 2155 bp += cnt; 2156 byte_count += cnt; 2157 } 2158 } 2159 ENDXFER; 2160 free(buf); 2161 reply(226, "Transfer complete."); 2162 return (0); 2163 default: 2164 ENDXFER; 2165 reply(550, "Unimplemented TYPE %d in send_data.", type); 2166 return (-1); 2167 } 2168 2169 data_err: 2170 ENDXFER; 2171 perror_reply(426, "Data connection"); 2172 return (-1); 2173 2174 file_err: 2175 ENDXFER; 2176 perror_reply(551, "Error on input file"); 2177 return (-1); 2178 } 2179 2180 /* 2181 * Transfer data from peer to "outstr" using the appropriate encapulation of 2182 * the data subject to Mode, Structure, and Type. 2183 * 2184 * N.B.: Form isn't handled. 2185 */ 2186 static int 2187 receive_data(FILE *instr, FILE *outstr) 2188 { 2189 int c, cp; 2190 int bare_lfs = 0; 2191 2192 STARTXFER; 2193 2194 switch (type) { 2195 2196 case TYPE_I: 2197 case TYPE_L: 2198 for (;;) { 2199 int cnt, len; 2200 char *bp; 2201 char buf[BUFSIZ]; 2202 2203 cnt = read(fileno(instr), buf, sizeof(buf)); 2204 CHECKOOB(return (-1)) 2205 else if (cnt < 0) 2206 goto data_err; 2207 if (cnt < 0) /* resume after OOB */ 2208 continue; 2209 if (cnt == 0) /* EOF */ 2210 break; 2211 for (len = cnt, bp = buf; len > 0;) { 2212 cnt = write(fileno(outstr), bp, len); 2213 CHECKOOB(return (-1)) 2214 else if (cnt < 0) 2215 goto file_err; 2216 if (cnt <= 0) 2217 continue; 2218 len -= cnt; 2219 bp += cnt; 2220 byte_count += cnt; 2221 } 2222 } 2223 ENDXFER; 2224 return (0); 2225 2226 case TYPE_E: 2227 ENDXFER; 2228 reply(553, "TYPE E not implemented."); 2229 return (-1); 2230 2231 case TYPE_A: 2232 cp = EOF; 2233 for (;;) { 2234 c = getc(instr); 2235 CHECKOOB(return (-1)) 2236 else if (c == EOF && ferror(instr)) 2237 goto data_err; 2238 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2239 clearerr(instr); 2240 continue; 2241 } 2242 2243 if (cp == '\r') { 2244 if (c != '\n') 2245 FTPD_PUTC('\r', outstr, file_err); 2246 } else 2247 if (c == '\n') 2248 bare_lfs++; 2249 if (c == '\r') { 2250 byte_count++; 2251 cp = c; 2252 continue; 2253 } 2254 2255 /* Check for EOF here in order not to lose last \r. */ 2256 if (c == EOF) { 2257 if (feof(instr)) /* EOF */ 2258 break; 2259 syslog(LOG_ERR, "Internal: impossible condition" 2260 " on data stream after getc()"); 2261 goto data_err; 2262 } 2263 2264 byte_count++; 2265 FTPD_PUTC(c, outstr, file_err); 2266 cp = c; 2267 } 2268 #ifdef notyet /* BSD stdio isn't ready for that */ 2269 while (fflush(outstr) == EOF) { 2270 CHECKOOB(return (-1)) 2271 else 2272 goto file_err; 2273 clearerr(outstr); 2274 } 2275 ENDXFER; 2276 #else 2277 ENDXFER; 2278 if (fflush(outstr) == EOF) 2279 goto file_err; 2280 #endif 2281 if (bare_lfs) { 2282 lreply(226, 2283 "WARNING! %d bare linefeeds received in ASCII mode.", 2284 bare_lfs); 2285 printf(" File may not have transferred correctly.\r\n"); 2286 } 2287 return (0); 2288 default: 2289 ENDXFER; 2290 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2291 return (-1); 2292 } 2293 2294 data_err: 2295 ENDXFER; 2296 perror_reply(426, "Data connection"); 2297 return (-1); 2298 2299 file_err: 2300 ENDXFER; 2301 perror_reply(452, "Error writing to file"); 2302 return (-1); 2303 } 2304 2305 void 2306 statfilecmd(char *filename) 2307 { 2308 FILE *fin; 2309 int atstart; 2310 int c, code; 2311 char line[LINE_MAX]; 2312 struct stat st; 2313 2314 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2315 snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2316 fin = ftpd_popen(line, "r"); 2317 lreply(code, "Status of %s:", filename); 2318 atstart = 1; 2319 while ((c = getc(fin)) != EOF) { 2320 if (c == '\n') { 2321 if (ferror(stdout)){ 2322 perror_reply(421, "Control connection"); 2323 ftpd_pclose(fin); 2324 dologout(1); 2325 /* NOTREACHED */ 2326 } 2327 if (ferror(fin)) { 2328 perror_reply(551, filename); 2329 ftpd_pclose(fin); 2330 return; 2331 } 2332 putc('\r', stdout); 2333 } 2334 /* 2335 * RFC 959 says neutral text should be prepended before 2336 * a leading 3-digit number followed by whitespace, but 2337 * many ftp clients can be confused by any leading digits, 2338 * as a matter of fact. 2339 */ 2340 if (atstart && isdigit(c)) 2341 putc(' ', stdout); 2342 putc(c, stdout); 2343 atstart = (c == '\n'); 2344 } 2345 ftpd_pclose(fin); 2346 reply(code, "End of status."); 2347 } 2348 2349 void 2350 statcmd(void) 2351 { 2352 union sockunion *su; 2353 u_char *a, *p; 2354 char hname[NI_MAXHOST]; 2355 int ispassive; 2356 2357 if (hostinfo) { 2358 lreply(211, "%s FTP server status:", hostname); 2359 printf(" %s\r\n", version); 2360 } else 2361 lreply(211, "FTP server status:"); 2362 printf(" Connected to %s", remotehost); 2363 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2364 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2365 hname[sizeof(hname) - 1] = 0; 2366 if (strcmp(hname, remotehost) != 0) 2367 printf(" (%s)", hname); 2368 } 2369 printf("\r\n"); 2370 if (logged_in) { 2371 if (guest) 2372 printf(" Logged in anonymously\r\n"); 2373 else 2374 printf(" Logged in as %s\r\n", pw->pw_name); 2375 } else if (askpasswd) 2376 printf(" Waiting for password\r\n"); 2377 else 2378 printf(" Waiting for user name\r\n"); 2379 printf(" TYPE: %s", typenames[type]); 2380 if (type == TYPE_A || type == TYPE_E) 2381 printf(", FORM: %s", formnames[form]); 2382 if (type == TYPE_L) 2383 #if CHAR_BIT == 8 2384 printf(" %d", CHAR_BIT); 2385 #else 2386 printf(" %d", bytesize); /* need definition! */ 2387 #endif 2388 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2389 strunames[stru], modenames[mode]); 2390 if (data != -1) 2391 printf(" Data connection open\r\n"); 2392 else if (pdata != -1) { 2393 ispassive = 1; 2394 su = &pasv_addr; 2395 goto printaddr; 2396 } else if (usedefault == 0) { 2397 ispassive = 0; 2398 su = &data_dest; 2399 printaddr: 2400 #define UC(b) (((int) b) & 0xff) 2401 if (epsvall) { 2402 printf(" EPSV only mode (EPSV ALL)\r\n"); 2403 goto epsvonly; 2404 } 2405 2406 /* PORT/PASV */ 2407 if (su->su_family == AF_INET) { 2408 a = (u_char *) &su->su_sin.sin_addr; 2409 p = (u_char *) &su->su_sin.sin_port; 2410 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2411 ispassive ? "PASV" : "PORT", 2412 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2413 UC(p[0]), UC(p[1])); 2414 } 2415 2416 /* LPRT/LPSV */ 2417 { 2418 int alen, af, i; 2419 2420 switch (su->su_family) { 2421 case AF_INET: 2422 a = (u_char *) &su->su_sin.sin_addr; 2423 p = (u_char *) &su->su_sin.sin_port; 2424 alen = sizeof(su->su_sin.sin_addr); 2425 af = 4; 2426 break; 2427 case AF_INET6: 2428 a = (u_char *) &su->su_sin6.sin6_addr; 2429 p = (u_char *) &su->su_sin6.sin6_port; 2430 alen = sizeof(su->su_sin6.sin6_addr); 2431 af = 6; 2432 break; 2433 default: 2434 af = 0; 2435 break; 2436 } 2437 if (af) { 2438 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2439 af, alen); 2440 for (i = 0; i < alen; i++) 2441 printf("%d,", UC(a[i])); 2442 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2443 } 2444 } 2445 2446 epsvonly:; 2447 /* EPRT/EPSV */ 2448 { 2449 int af; 2450 2451 switch (su->su_family) { 2452 case AF_INET: 2453 af = 1; 2454 break; 2455 case AF_INET6: 2456 af = 2; 2457 break; 2458 default: 2459 af = 0; 2460 break; 2461 } 2462 if (af) { 2463 union sockunion tmp; 2464 2465 tmp = *su; 2466 if (tmp.su_family == AF_INET6) 2467 tmp.su_sin6.sin6_scope_id = 0; 2468 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2469 hname, sizeof(hname) - 1, NULL, 0, 2470 NI_NUMERICHOST)) { 2471 hname[sizeof(hname) - 1] = 0; 2472 printf(" %s |%d|%s|%d|\r\n", 2473 ispassive ? "EPSV" : "EPRT", 2474 af, hname, htons(tmp.su_port)); 2475 } 2476 } 2477 } 2478 #undef UC 2479 } else 2480 printf(" No data connection\r\n"); 2481 reply(211, "End of status."); 2482 } 2483 2484 void 2485 fatalerror(char *s) 2486 { 2487 2488 reply(451, "Error in server: %s", s); 2489 reply(221, "Closing connection due to server error."); 2490 dologout(0); 2491 /* NOTREACHED */ 2492 } 2493 2494 void 2495 reply(int n, const char *fmt, ...) 2496 { 2497 va_list ap; 2498 2499 printf("%d ", n); 2500 va_start(ap, fmt); 2501 vprintf(fmt, ap); 2502 va_end(ap); 2503 printf("\r\n"); 2504 fflush(stdout); 2505 if (ftpdebug) { 2506 syslog(LOG_DEBUG, "<--- %d ", n); 2507 va_start(ap, fmt); 2508 vsyslog(LOG_DEBUG, fmt, ap); 2509 va_end(ap); 2510 } 2511 } 2512 2513 void 2514 lreply(int n, const char *fmt, ...) 2515 { 2516 va_list ap; 2517 2518 printf("%d- ", n); 2519 va_start(ap, fmt); 2520 vprintf(fmt, ap); 2521 va_end(ap); 2522 printf("\r\n"); 2523 fflush(stdout); 2524 if (ftpdebug) { 2525 syslog(LOG_DEBUG, "<--- %d- ", n); 2526 va_start(ap, fmt); 2527 vsyslog(LOG_DEBUG, fmt, ap); 2528 va_end(ap); 2529 } 2530 } 2531 2532 static void 2533 ack(char *s) 2534 { 2535 2536 reply(250, "%s command successful.", s); 2537 } 2538 2539 void 2540 nack(char *s) 2541 { 2542 2543 reply(502, "%s command not implemented.", s); 2544 } 2545 2546 /* ARGSUSED */ 2547 void 2548 yyerror(char *s) 2549 { 2550 char *cp; 2551 2552 if ((cp = strchr(cbuf,'\n'))) 2553 *cp = '\0'; 2554 reply(500, "%s: command not understood.", cbuf); 2555 } 2556 2557 void 2558 delete(char *name) 2559 { 2560 struct stat st; 2561 2562 LOGCMD("delete", name); 2563 if (lstat(name, &st) < 0) { 2564 perror_reply(550, name); 2565 return; 2566 } 2567 if (S_ISDIR(st.st_mode)) { 2568 if (rmdir(name) < 0) { 2569 perror_reply(550, name); 2570 return; 2571 } 2572 goto done; 2573 } 2574 if (guest && noguestmod) { 2575 reply(550, "Operation not permitted."); 2576 return; 2577 } 2578 if (unlink(name) < 0) { 2579 perror_reply(550, name); 2580 return; 2581 } 2582 done: 2583 ack("DELE"); 2584 } 2585 2586 void 2587 cwd(char *path) 2588 { 2589 2590 if (chdir(path) < 0) 2591 perror_reply(550, path); 2592 else 2593 ack("CWD"); 2594 } 2595 2596 void 2597 makedir(char *name) 2598 { 2599 char *s; 2600 2601 LOGCMD("mkdir", name); 2602 if (guest && noguestmkd) 2603 reply(550, "Operation not permitted."); 2604 else if (mkdir(name, 0777) < 0) 2605 perror_reply(550, name); 2606 else { 2607 if ((s = doublequote(name)) == NULL) 2608 fatalerror("Ran out of memory."); 2609 reply(257, "\"%s\" directory created.", s); 2610 free(s); 2611 } 2612 } 2613 2614 void 2615 removedir(char *name) 2616 { 2617 2618 LOGCMD("rmdir", name); 2619 if (rmdir(name) < 0) 2620 perror_reply(550, name); 2621 else 2622 ack("RMD"); 2623 } 2624 2625 void 2626 pwd(void) 2627 { 2628 char *s, path[MAXPATHLEN + 1]; 2629 2630 if (getcwd(path, sizeof(path)) == NULL) 2631 perror_reply(550, "Get current directory"); 2632 else { 2633 if ((s = doublequote(path)) == NULL) 2634 fatalerror("Ran out of memory."); 2635 reply(257, "\"%s\" is current directory.", s); 2636 free(s); 2637 } 2638 } 2639 2640 char * 2641 renamefrom(char *name) 2642 { 2643 struct stat st; 2644 2645 if (guest && noguestmod) { 2646 reply(550, "Operation not permitted."); 2647 return (NULL); 2648 } 2649 if (lstat(name, &st) < 0) { 2650 perror_reply(550, name); 2651 return (NULL); 2652 } 2653 reply(350, "File exists, ready for destination name."); 2654 return (name); 2655 } 2656 2657 void 2658 renamecmd(char *from, char *to) 2659 { 2660 struct stat st; 2661 2662 LOGCMD2("rename", from, to); 2663 2664 if (guest && (stat(to, &st) == 0)) { 2665 reply(550, "%s: permission denied.", to); 2666 return; 2667 } 2668 2669 if (rename(from, to) < 0) 2670 perror_reply(550, "rename"); 2671 else 2672 ack("RNTO"); 2673 } 2674 2675 static void 2676 dolog(struct sockaddr *who) 2677 { 2678 char who_name[NI_MAXHOST]; 2679 2680 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2681 remotehost[sizeof(remotehost) - 1] = 0; 2682 if (getnameinfo(who, who->sa_len, 2683 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2684 *who_name = 0; 2685 who_name[sizeof(who_name) - 1] = 0; 2686 2687 #ifdef SETPROCTITLE 2688 #ifdef VIRTUAL_HOSTING 2689 if (thishost != firsthost) 2690 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2691 remotehost, hostname); 2692 else 2693 #endif 2694 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2695 remotehost); 2696 setproctitle("%s", proctitle); 2697 #endif /* SETPROCTITLE */ 2698 2699 if (logging) { 2700 #ifdef VIRTUAL_HOSTING 2701 if (thishost != firsthost) 2702 syslog(LOG_INFO, "connection from %s (%s) to %s", 2703 remotehost, who_name, hostname); 2704 else 2705 #endif 2706 syslog(LOG_INFO, "connection from %s (%s)", 2707 remotehost, who_name); 2708 } 2709 } 2710 2711 /* 2712 * Record logout in wtmp file 2713 * and exit with supplied status. 2714 */ 2715 void 2716 dologout(int status) 2717 { 2718 2719 if (logged_in && dowtmp) { 2720 seteuid(0); 2721 ftpd_logwtmp(ttyline, "", NULL); 2722 } 2723 /* beware of flushing buffers after a SIGPIPE */ 2724 _exit(status); 2725 } 2726 2727 static void 2728 sigurg(int signo) 2729 { 2730 2731 recvurg = 1; 2732 } 2733 2734 static void 2735 maskurg(int flag) 2736 { 2737 int oerrno; 2738 sigset_t sset; 2739 2740 if (!transflag) { 2741 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2742 return; 2743 } 2744 oerrno = errno; 2745 sigemptyset(&sset); 2746 sigaddset(&sset, SIGURG); 2747 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2748 errno = oerrno; 2749 } 2750 2751 static void 2752 flagxfer(int flag) 2753 { 2754 2755 if (flag) { 2756 if (transflag) 2757 syslog(LOG_ERR, "Internal: flagxfer(1): " 2758 "transfer already under way"); 2759 transflag = 1; 2760 maskurg(0); 2761 recvurg = 0; 2762 } else { 2763 if (!transflag) 2764 syslog(LOG_ERR, "Internal: flagxfer(0): " 2765 "no active transfer"); 2766 maskurg(1); 2767 transflag = 0; 2768 } 2769 } 2770 2771 /* 2772 * Returns 0 if OK to resume or -1 if abort requested. 2773 */ 2774 static int 2775 myoob(void) 2776 { 2777 char *cp; 2778 int ret; 2779 2780 if (!transflag) { 2781 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2782 return (0); 2783 } 2784 cp = tmpline; 2785 ret = getline(cp, 7, stdin); 2786 if (ret == -1) { 2787 reply(221, "You could at least say goodbye."); 2788 dologout(0); 2789 } else if (ret == -2) { 2790 /* Ignore truncated command. */ 2791 return (0); 2792 } 2793 upper(cp); 2794 if (strcmp(cp, "ABOR\r\n") == 0) { 2795 tmpline[0] = '\0'; 2796 reply(426, "Transfer aborted. Data connection closed."); 2797 reply(226, "Abort successful."); 2798 return (-1); 2799 } 2800 if (strcmp(cp, "STAT\r\n") == 0) { 2801 tmpline[0] = '\0'; 2802 if (file_size != -1) 2803 reply(213, "Status: %jd of %jd bytes transferred.", 2804 (intmax_t)byte_count, (intmax_t)file_size); 2805 else 2806 reply(213, "Status: %jd bytes transferred.", 2807 (intmax_t)byte_count); 2808 } 2809 return (0); 2810 } 2811 2812 /* 2813 * Note: a response of 425 is not mentioned as a possible response to 2814 * the PASV command in RFC959. However, it has been blessed as 2815 * a legitimate response by Jon Postel in a telephone conversation 2816 * with Rick Adams on 25 Jan 89. 2817 */ 2818 void 2819 passive(void) 2820 { 2821 socklen_t len; 2822 int on; 2823 char *p, *a; 2824 2825 if (pdata >= 0) /* close old port if one set */ 2826 close(pdata); 2827 2828 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2829 if (pdata < 0) { 2830 perror_reply(425, "Can't open passive connection"); 2831 return; 2832 } 2833 on = 1; 2834 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2835 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2836 2837 seteuid(0); 2838 2839 #ifdef IP_PORTRANGE 2840 if (ctrl_addr.su_family == AF_INET) { 2841 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2842 : IP_PORTRANGE_DEFAULT; 2843 2844 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2845 &on, sizeof(on)) < 0) 2846 goto pasv_error; 2847 } 2848 #endif 2849 #ifdef IPV6_PORTRANGE 2850 if (ctrl_addr.su_family == AF_INET6) { 2851 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2852 : IPV6_PORTRANGE_DEFAULT; 2853 2854 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2855 &on, sizeof(on)) < 0) 2856 goto pasv_error; 2857 } 2858 #endif 2859 2860 pasv_addr = ctrl_addr; 2861 pasv_addr.su_port = 0; 2862 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2863 goto pasv_error; 2864 2865 seteuid(pw->pw_uid); 2866 2867 len = sizeof(pasv_addr); 2868 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2869 goto pasv_error; 2870 if (listen(pdata, 1) < 0) 2871 goto pasv_error; 2872 if (pasv_addr.su_family == AF_INET) 2873 a = (char *) &pasv_addr.su_sin.sin_addr; 2874 else if (pasv_addr.su_family == AF_INET6 && 2875 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2876 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2877 else 2878 goto pasv_error; 2879 2880 p = (char *) &pasv_addr.su_port; 2881 2882 #define UC(b) (((int) b) & 0xff) 2883 2884 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2885 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2886 return; 2887 2888 pasv_error: 2889 seteuid(pw->pw_uid); 2890 close(pdata); 2891 pdata = -1; 2892 perror_reply(425, "Can't open passive connection"); 2893 return; 2894 } 2895 2896 /* 2897 * Long Passive defined in RFC 1639. 2898 * 228 Entering Long Passive Mode 2899 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2900 */ 2901 2902 void 2903 long_passive(char *cmd, int pf) 2904 { 2905 socklen_t len; 2906 int on; 2907 char *p, *a; 2908 2909 if (pdata >= 0) /* close old port if one set */ 2910 close(pdata); 2911 2912 if (pf != PF_UNSPEC) { 2913 if (ctrl_addr.su_family != pf) { 2914 switch (ctrl_addr.su_family) { 2915 case AF_INET: 2916 pf = 1; 2917 break; 2918 case AF_INET6: 2919 pf = 2; 2920 break; 2921 default: 2922 pf = 0; 2923 break; 2924 } 2925 /* 2926 * XXX 2927 * only EPRT/EPSV ready clients will understand this 2928 */ 2929 if (strcmp(cmd, "EPSV") == 0 && pf) { 2930 reply(522, "Network protocol mismatch, " 2931 "use (%d)", pf); 2932 } else 2933 reply(501, "Network protocol mismatch."); /*XXX*/ 2934 2935 return; 2936 } 2937 } 2938 2939 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2940 if (pdata < 0) { 2941 perror_reply(425, "Can't open passive connection"); 2942 return; 2943 } 2944 on = 1; 2945 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2946 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2947 2948 seteuid(0); 2949 2950 pasv_addr = ctrl_addr; 2951 pasv_addr.su_port = 0; 2952 len = pasv_addr.su_len; 2953 2954 #ifdef IP_PORTRANGE 2955 if (ctrl_addr.su_family == AF_INET) { 2956 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2957 : IP_PORTRANGE_DEFAULT; 2958 2959 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2960 &on, sizeof(on)) < 0) 2961 goto pasv_error; 2962 } 2963 #endif 2964 #ifdef IPV6_PORTRANGE 2965 if (ctrl_addr.su_family == AF_INET6) { 2966 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2967 : IPV6_PORTRANGE_DEFAULT; 2968 2969 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2970 &on, sizeof(on)) < 0) 2971 goto pasv_error; 2972 } 2973 #endif 2974 2975 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2976 goto pasv_error; 2977 2978 seteuid(pw->pw_uid); 2979 2980 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2981 goto pasv_error; 2982 if (listen(pdata, 1) < 0) 2983 goto pasv_error; 2984 2985 #define UC(b) (((int) b) & 0xff) 2986 2987 if (strcmp(cmd, "LPSV") == 0) { 2988 p = (char *)&pasv_addr.su_port; 2989 switch (pasv_addr.su_family) { 2990 case AF_INET: 2991 a = (char *) &pasv_addr.su_sin.sin_addr; 2992 v4_reply: 2993 reply(228, 2994 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2995 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2996 2, UC(p[0]), UC(p[1])); 2997 return; 2998 case AF_INET6: 2999 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3000 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3001 goto v4_reply; 3002 } 3003 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3004 reply(228, 3005 "Entering Long Passive Mode " 3006 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3007 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3008 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3009 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3010 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3011 2, UC(p[0]), UC(p[1])); 3012 return; 3013 } 3014 } else if (strcmp(cmd, "EPSV") == 0) { 3015 switch (pasv_addr.su_family) { 3016 case AF_INET: 3017 case AF_INET6: 3018 reply(229, "Entering Extended Passive Mode (|||%d|)", 3019 ntohs(pasv_addr.su_port)); 3020 return; 3021 } 3022 } else { 3023 /* more proper error code? */ 3024 } 3025 3026 pasv_error: 3027 seteuid(pw->pw_uid); 3028 close(pdata); 3029 pdata = -1; 3030 perror_reply(425, "Can't open passive connection"); 3031 return; 3032 } 3033 3034 /* 3035 * Generate unique name for file with basename "local" 3036 * and open the file in order to avoid possible races. 3037 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3038 * Return descriptor to the file, set "name" to its name. 3039 * 3040 * Generates failure reply on error. 3041 */ 3042 static int 3043 guniquefd(char *local, char **name) 3044 { 3045 static char new[MAXPATHLEN]; 3046 struct stat st; 3047 char *cp; 3048 int count; 3049 int fd; 3050 3051 cp = strrchr(local, '/'); 3052 if (cp) 3053 *cp = '\0'; 3054 if (stat(cp ? local : ".", &st) < 0) { 3055 perror_reply(553, cp ? local : "."); 3056 return (-1); 3057 } 3058 if (cp) { 3059 /* 3060 * Let not overwrite dirname with counter suffix. 3061 * -4 is for /nn\0 3062 * In this extreme case dot won't be put in front of suffix. 3063 */ 3064 if (strlen(local) > sizeof(new) - 4) { 3065 reply(553, "Pathname too long."); 3066 return (-1); 3067 } 3068 *cp = '/'; 3069 } 3070 /* -4 is for the .nn<null> we put on the end below */ 3071 snprintf(new, sizeof(new) - 4, "%s", local); 3072 cp = new + strlen(new); 3073 /* 3074 * Don't generate dotfile unless requested explicitly. 3075 * This covers the case when basename gets truncated off 3076 * by buffer size. 3077 */ 3078 if (cp > new && cp[-1] != '/') 3079 *cp++ = '.'; 3080 for (count = 0; count < 100; count++) { 3081 /* At count 0 try unmodified name */ 3082 if (count) 3083 sprintf(cp, "%d", count); 3084 if ((fd = open(count ? new : local, 3085 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3086 *name = count ? new : local; 3087 return (fd); 3088 } 3089 if (errno != EEXIST) { 3090 perror_reply(553, count ? new : local); 3091 return (-1); 3092 } 3093 } 3094 reply(452, "Unique file name cannot be created."); 3095 return (-1); 3096 } 3097 3098 /* 3099 * Format and send reply containing system error number. 3100 */ 3101 void 3102 perror_reply(int code, char *string) 3103 { 3104 3105 reply(code, "%s: %s.", string, strerror(errno)); 3106 } 3107 3108 static char *onefile[] = { 3109 "", 3110 0 3111 }; 3112 3113 void 3114 send_file_list(char *whichf) 3115 { 3116 struct stat st; 3117 DIR *dirp = NULL; 3118 struct dirent *dir; 3119 FILE *dout = NULL; 3120 char **dirlist, *dirname; 3121 int simple = 0; 3122 int freeglob = 0; 3123 glob_t gl; 3124 3125 if (strpbrk(whichf, "~{[*?") != NULL) { 3126 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3127 3128 memset(&gl, 0, sizeof(gl)); 3129 gl.gl_matchc = MAXGLOBARGS; 3130 /*flags |= GLOB_LIMIT;*/ 3131 freeglob = 1; 3132 if (glob(whichf, flags, 0, &gl)) { 3133 reply(550, "No matching files found."); 3134 goto out; 3135 } else if (gl.gl_pathc == 0) { 3136 errno = ENOENT; 3137 perror_reply(550, whichf); 3138 goto out; 3139 } 3140 dirlist = gl.gl_pathv; 3141 } else { 3142 onefile[0] = whichf; 3143 dirlist = onefile; 3144 simple = 1; 3145 } 3146 3147 while ((dirname = *dirlist++)) { 3148 if (stat(dirname, &st) < 0) { 3149 /* 3150 * If user typed "ls -l", etc, and the client 3151 * used NLST, do what the user meant. 3152 */ 3153 if (dirname[0] == '-' && *dirlist == NULL && 3154 dout == NULL) 3155 retrieve(_PATH_LS " %s", dirname); 3156 else 3157 perror_reply(550, whichf); 3158 goto out; 3159 } 3160 3161 if (S_ISREG(st.st_mode)) { 3162 if (dout == NULL) { 3163 dout = dataconn("file list", -1, "w"); 3164 if (dout == NULL) 3165 goto out; 3166 STARTXFER; 3167 } 3168 START_UNSAFE; 3169 fprintf(dout, "%s%s\n", dirname, 3170 type == TYPE_A ? "\r" : ""); 3171 END_UNSAFE; 3172 if (ferror(dout)) 3173 goto data_err; 3174 byte_count += strlen(dirname) + 3175 (type == TYPE_A ? 2 : 1); 3176 CHECKOOB(goto abrt); 3177 continue; 3178 } else if (!S_ISDIR(st.st_mode)) 3179 continue; 3180 3181 if ((dirp = opendir(dirname)) == NULL) 3182 continue; 3183 3184 while ((dir = readdir(dirp)) != NULL) { 3185 char nbuf[MAXPATHLEN]; 3186 3187 CHECKOOB(goto abrt); 3188 3189 if (strcmp(dir->d_name, ".") == 0) 3190 continue; 3191 if (strcmp(dir->d_name, "..") == 0) 3192 continue; 3193 3194 snprintf(nbuf, sizeof(nbuf), 3195 "%s/%s", dirname, dir->d_name); 3196 3197 /* 3198 * We have to do a stat to insure it's 3199 * not a directory or special file. 3200 */ 3201 if (simple || (stat(nbuf, &st) == 0 && 3202 S_ISREG(st.st_mode))) { 3203 if (dout == NULL) { 3204 dout = dataconn("file list", -1, "w"); 3205 if (dout == NULL) 3206 goto out; 3207 STARTXFER; 3208 } 3209 START_UNSAFE; 3210 if (nbuf[0] == '.' && nbuf[1] == '/') 3211 fprintf(dout, "%s%s\n", &nbuf[2], 3212 type == TYPE_A ? "\r" : ""); 3213 else 3214 fprintf(dout, "%s%s\n", nbuf, 3215 type == TYPE_A ? "\r" : ""); 3216 END_UNSAFE; 3217 if (ferror(dout)) 3218 goto data_err; 3219 byte_count += strlen(nbuf) + 3220 (type == TYPE_A ? 2 : 1); 3221 CHECKOOB(goto abrt); 3222 } 3223 } 3224 closedir(dirp); 3225 dirp = NULL; 3226 } 3227 3228 if (dout == NULL) 3229 reply(550, "No files found."); 3230 else if (ferror(dout)) 3231 data_err: perror_reply(550, "Data connection"); 3232 else 3233 reply(226, "Transfer complete."); 3234 out: 3235 if (dout) { 3236 ENDXFER; 3237 abrt: 3238 fclose(dout); 3239 data = -1; 3240 pdata = -1; 3241 } 3242 if (dirp) 3243 closedir(dirp); 3244 if (freeglob) { 3245 freeglob = 0; 3246 globfree(&gl); 3247 } 3248 } 3249 3250 void 3251 reapchild(int signo) 3252 { 3253 while (waitpid(-1, NULL, WNOHANG) > 0); 3254 } 3255 3256 static void 3257 appendf(char **strp, char *fmt, ...) 3258 { 3259 va_list ap; 3260 char *ostr, *p; 3261 3262 va_start(ap, fmt); 3263 vasprintf(&p, fmt, ap); 3264 va_end(ap); 3265 if (p == NULL) 3266 fatalerror("Ran out of memory."); 3267 if (*strp == NULL) 3268 *strp = p; 3269 else { 3270 ostr = *strp; 3271 asprintf(strp, "%s%s", ostr, p); 3272 if (*strp == NULL) 3273 fatalerror("Ran out of memory."); 3274 free(ostr); 3275 } 3276 } 3277 3278 static void 3279 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3280 { 3281 char *msg = NULL; 3282 char wd[MAXPATHLEN + 1]; 3283 3284 if (logging <= 1) 3285 return; 3286 3287 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3288 strcpy(wd, strerror(errno)); 3289 3290 appendf(&msg, "%s", cmd); 3291 if (file1) 3292 appendf(&msg, " %s", file1); 3293 if (file2) 3294 appendf(&msg, " %s", file2); 3295 if (cnt >= 0) 3296 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3297 appendf(&msg, " (wd: %s", wd); 3298 if (guest || dochroot) 3299 appendf(&msg, "; chrooted"); 3300 appendf(&msg, ")"); 3301 syslog(LOG_INFO, "%s", msg); 3302 free(msg); 3303 } 3304 3305 static void 3306 logxfer(char *name, off_t size, time_t start) 3307 { 3308 char buf[MAXPATHLEN + 1024]; 3309 char path[MAXPATHLEN + 1]; 3310 time_t now; 3311 3312 if (statfd >= 0) { 3313 time(&now); 3314 if (realpath(name, path) == NULL) { 3315 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3316 return; 3317 } 3318 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3319 ctime(&now)+4, ident, remotehost, 3320 path, (intmax_t)size, 3321 (long)(now - start + (now == start))); 3322 write(statfd, buf, strlen(buf)); 3323 } 3324 } 3325 3326 static char * 3327 doublequote(char *s) 3328 { 3329 int n; 3330 char *p, *s2; 3331 3332 for (p = s, n = 0; *p; p++) 3333 if (*p == '"') 3334 n++; 3335 3336 if ((s2 = malloc(p - s + n + 1)) == NULL) 3337 return (NULL); 3338 3339 for (p = s2; *s; s++, p++) { 3340 if ((*p = *s) == '"') 3341 *(++p) = '"'; 3342 } 3343 *p = '\0'; 3344 3345 return (s2); 3346 } 3347 3348 /* setup server socket for specified address family */ 3349 /* if af is PF_UNSPEC more than one socket may be returned */ 3350 /* the returned list is dynamically allocated, so caller needs to free it */ 3351 static int * 3352 socksetup(int af, char *bindname, const char *bindport) 3353 { 3354 struct addrinfo hints, *res, *r; 3355 int error, maxs, *s, *socks; 3356 const int on = 1; 3357 3358 memset(&hints, 0, sizeof(hints)); 3359 hints.ai_flags = AI_PASSIVE; 3360 hints.ai_family = af; 3361 hints.ai_socktype = SOCK_STREAM; 3362 error = getaddrinfo(bindname, bindport, &hints, &res); 3363 if (error) { 3364 syslog(LOG_ERR, "%s", gai_strerror(error)); 3365 if (error == EAI_SYSTEM) 3366 syslog(LOG_ERR, "%s", strerror(errno)); 3367 return NULL; 3368 } 3369 3370 /* Count max number of sockets we may open */ 3371 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3372 ; 3373 socks = malloc((maxs + 1) * sizeof(int)); 3374 if (!socks) { 3375 freeaddrinfo(res); 3376 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3377 return NULL; 3378 } 3379 3380 *socks = 0; /* num of sockets counter at start of array */ 3381 s = socks + 1; 3382 for (r = res; r; r = r->ai_next) { 3383 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3384 if (*s < 0) { 3385 syslog(LOG_DEBUG, "control socket: %m"); 3386 continue; 3387 } 3388 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3389 &on, sizeof(on)) < 0) 3390 syslog(LOG_WARNING, 3391 "control setsockopt (SO_REUSEADDR): %m"); 3392 if (r->ai_family == AF_INET6) { 3393 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3394 &on, sizeof(on)) < 0) 3395 syslog(LOG_WARNING, 3396 "control setsockopt (IPV6_V6ONLY): %m"); 3397 } 3398 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3399 syslog(LOG_DEBUG, "control bind: %m"); 3400 close(*s); 3401 continue; 3402 } 3403 (*socks)++; 3404 s++; 3405 } 3406 3407 if (res) 3408 freeaddrinfo(res); 3409 3410 if (*socks == 0) { 3411 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3412 free(socks); 3413 return NULL; 3414 } 3415 return(socks); 3416 } 3417