1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static char copyright[] = 35 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 #endif 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/cdefs.h> 47 /* 48 * FTP server. 49 */ 50 #include <sys/param.h> 51 #include <sys/ioctl.h> 52 #include <sys/mman.h> 53 #include <sys/socket.h> 54 #include <sys/stat.h> 55 #include <sys/time.h> 56 #include <sys/wait.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/ip.h> 61 #include <netinet/tcp.h> 62 63 #define FTP_NAMES 64 #include <arpa/ftp.h> 65 #include <arpa/inet.h> 66 #include <arpa/telnet.h> 67 68 #include <ctype.h> 69 #include <dirent.h> 70 #include <err.h> 71 #include <errno.h> 72 #include <fcntl.h> 73 #include <glob.h> 74 #include <limits.h> 75 #include <netdb.h> 76 #include <pwd.h> 77 #include <grp.h> 78 #include <signal.h> 79 #include <stdint.h> 80 #include <stdio.h> 81 #include <stdlib.h> 82 #include <string.h> 83 #include <syslog.h> 84 #include <time.h> 85 #include <unistd.h> 86 #include <libutil.h> 87 #ifdef LOGIN_CAP 88 #include <login_cap.h> 89 #endif 90 91 #ifdef USE_PAM 92 #include <security/pam_appl.h> 93 #endif 94 95 #include "blacklist_client.h" 96 #include "pathnames.h" 97 #include "extern.h" 98 99 #include <stdarg.h> 100 101 static char version[] = "Version 6.00LS"; 102 #undef main 103 104 union sockunion ctrl_addr; 105 union sockunion data_source; 106 union sockunion data_dest; 107 union sockunion his_addr; 108 union sockunion pasv_addr; 109 110 int daemon_mode; 111 int data; 112 int dataport; 113 int hostinfo = 1; /* print host-specific info in messages */ 114 int logged_in; 115 struct passwd *pw; 116 char *homedir; 117 int ftpdebug; 118 int timeout = 900; /* timeout after 15 minutes of inactivity */ 119 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 120 int logging; 121 int restricted_data_ports = 1; 122 int paranoid = 1; /* be extra careful about security */ 123 int anon_only = 0; /* Only anonymous ftp allowed */ 124 int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 125 int guest; 126 int dochroot; 127 char *chrootdir; 128 int dowtmp = 1; 129 int stats; 130 int statfd = -1; 131 int type; 132 int form; 133 int stru; /* avoid C keyword */ 134 int mode; 135 int usedefault = 1; /* for data transfers */ 136 int pdata = -1; /* for passive mode */ 137 int readonly = 0; /* Server is in readonly mode. */ 138 int noepsv = 0; /* EPSV command is disabled. */ 139 int noretr = 0; /* RETR command is disabled. */ 140 int noguestretr = 0; /* RETR command is disabled for anon users. */ 141 int noguestmkd = 0; /* MKD command is disabled for anon users. */ 142 int noguestmod = 1; /* anon users may not modify existing files. */ 143 int use_blacklist = 0; 144 145 off_t file_size; 146 off_t byte_count; 147 #if !defined(CMASK) || CMASK == 0 148 #undef CMASK 149 #define CMASK 027 150 #endif 151 int defumask = CMASK; /* default umask value */ 152 char tmpline[7]; 153 char *hostname; 154 int epsvall = 0; 155 156 #ifdef VIRTUAL_HOSTING 157 char *ftpuser; 158 159 static struct ftphost { 160 struct ftphost *next; 161 struct addrinfo *hostinfo; 162 char *hostname; 163 char *anonuser; 164 char *statfile; 165 char *welcome; 166 char *loginmsg; 167 } *thishost, *firsthost; 168 169 #endif 170 char remotehost[NI_MAXHOST]; 171 char *ident = NULL; 172 173 static char wtmpid[20]; 174 175 #ifdef USE_PAM 176 static int auth_pam(struct passwd**, const char*); 177 pam_handle_t *pamh = NULL; 178 #endif 179 180 char *pid_file = NULL; /* means default location to pidfile(3) */ 181 182 /* 183 * Limit number of pathnames that glob can return. 184 * A limit of 0 indicates the number of pathnames is unlimited. 185 */ 186 #define MAXGLOBARGS 16384 187 # 188 189 /* 190 * Timeout intervals for retrying connections 191 * to hosts that don't accept PORT cmds. This 192 * is a kludge, but given the problems with TCP... 193 */ 194 #define SWAITMAX 90 /* wait at most 90 seconds */ 195 #define SWAITINT 5 /* interval between retries */ 196 197 int swaitmax = SWAITMAX; 198 int swaitint = SWAITINT; 199 200 #ifdef SETPROCTITLE 201 char proctitle[LINE_MAX]; /* initial part of title */ 202 #endif /* SETPROCTITLE */ 203 204 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 205 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 206 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 207 208 static volatile sig_atomic_t recvurg; 209 static int transflag; /* NB: for debugging only */ 210 211 #define STARTXFER flagxfer(1) 212 #define ENDXFER flagxfer(0) 213 214 #define START_UNSAFE maskurg(1) 215 #define END_UNSAFE maskurg(0) 216 217 /* It's OK to put an `else' clause after this macro. */ 218 #define CHECKOOB(action) \ 219 if (recvurg) { \ 220 recvurg = 0; \ 221 if (myoob()) { \ 222 ENDXFER; \ 223 action; \ 224 } \ 225 } 226 227 #ifdef VIRTUAL_HOSTING 228 static void inithosts(int); 229 static void selecthost(union sockunion *); 230 #endif 231 static void ack(char *); 232 static void sigurg(int); 233 static void maskurg(int); 234 static void flagxfer(int); 235 static int myoob(void); 236 static int checkuser(char *, char *, int, char **, int *); 237 static FILE *dataconn(char *, off_t, char *); 238 static void dolog(struct sockaddr *); 239 static void end_login(void); 240 static FILE *getdatasock(char *); 241 static int guniquefd(char *, char **); 242 static void lostconn(int); 243 static void sigquit(int); 244 static int receive_data(FILE *, FILE *); 245 static int send_data(FILE *, FILE *, size_t, off_t, int); 246 static struct passwd * 247 sgetpwnam(char *); 248 static char *sgetsave(char *); 249 static void reapchild(int); 250 static void appendf(char **, char *, ...) __printflike(2, 3); 251 static void logcmd(char *, char *, char *, off_t); 252 static void logxfer(char *, off_t, time_t); 253 static char *doublequote(char *); 254 static int *socksetup(int, char *, const char *); 255 256 int 257 main(int argc, char *argv[], char **envp) 258 { 259 socklen_t addrlen; 260 int ch, on = 1, tos, s = STDIN_FILENO; 261 char *cp, line[LINE_MAX]; 262 FILE *fd; 263 char *bindname = NULL; 264 const char *bindport = "ftp"; 265 int family = AF_UNSPEC; 266 struct sigaction sa; 267 268 tzset(); /* in case no timezone database in ~ftp */ 269 sigemptyset(&sa.sa_mask); 270 sa.sa_flags = SA_RESTART; 271 272 /* 273 * Prevent diagnostic messages from appearing on stderr. 274 * We run as a daemon or from inetd; in both cases, there's 275 * more reason in logging to syslog. 276 */ 277 (void) freopen(_PATH_DEVNULL, "w", stderr); 278 opterr = 0; 279 280 /* 281 * LOG_NDELAY sets up the logging connection immediately, 282 * necessary for anonymous ftp's that chroot and can't do it later. 283 */ 284 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 285 286 while ((ch = getopt(argc, argv, 287 "468a:ABdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 288 switch (ch) { 289 case '4': 290 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 291 break; 292 293 case '6': 294 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 295 break; 296 297 case '8': 298 assumeutf8 = 1; 299 break; 300 301 case 'a': 302 bindname = optarg; 303 break; 304 305 case 'A': 306 anon_only = 1; 307 break; 308 309 case 'B': 310 #ifdef USE_BLACKLIST 311 use_blacklist = 1; 312 #else 313 syslog(LOG_WARNING, "not compiled with USE_BLACKLIST support"); 314 #endif 315 break; 316 317 case 'd': 318 ftpdebug++; 319 break; 320 321 case 'D': 322 daemon_mode++; 323 break; 324 325 case 'E': 326 noepsv = 1; 327 break; 328 329 case 'h': 330 hostinfo = 0; 331 break; 332 333 case 'l': 334 logging++; /* > 1 == extra logging */ 335 break; 336 337 case 'm': 338 noguestmod = 0; 339 break; 340 341 case 'M': 342 noguestmkd = 1; 343 break; 344 345 case 'o': 346 noretr = 1; 347 break; 348 349 case 'O': 350 noguestretr = 1; 351 break; 352 353 case 'p': 354 pid_file = optarg; 355 break; 356 357 case 'P': 358 bindport = optarg; 359 break; 360 361 case 'r': 362 readonly = 1; 363 break; 364 365 case 'R': 366 paranoid = 0; 367 break; 368 369 case 'S': 370 stats++; 371 break; 372 373 case 't': 374 timeout = atoi(optarg); 375 if (maxtimeout < timeout) 376 maxtimeout = timeout; 377 break; 378 379 case 'T': 380 maxtimeout = atoi(optarg); 381 if (timeout > maxtimeout) 382 timeout = maxtimeout; 383 break; 384 385 case 'u': 386 { 387 long val = 0; 388 389 val = strtol(optarg, &optarg, 8); 390 if (*optarg != '\0' || val < 0) 391 syslog(LOG_WARNING, "bad value for -u"); 392 else 393 defumask = val; 394 break; 395 } 396 case 'U': 397 restricted_data_ports = 0; 398 break; 399 400 case 'v': 401 ftpdebug++; 402 break; 403 404 case 'W': 405 dowtmp = 0; 406 break; 407 408 default: 409 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 410 break; 411 } 412 } 413 414 /* handle filesize limit gracefully */ 415 sa.sa_handler = SIG_IGN; 416 (void)sigaction(SIGXFSZ, &sa, NULL); 417 418 if (daemon_mode) { 419 int *ctl_sock, fd, maxfd = -1, nfds, i; 420 fd_set defreadfds, readfds; 421 pid_t pid; 422 struct pidfh *pfh; 423 424 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) { 425 if (errno == EEXIST) { 426 syslog(LOG_ERR, "%s already running, pid %d", 427 getprogname(), (int)pid); 428 exit(1); 429 } 430 syslog(LOG_WARNING, "pidfile_open: %m"); 431 } 432 433 /* 434 * Detach from parent. 435 */ 436 if (daemon(1, 1) < 0) { 437 syslog(LOG_ERR, "failed to become a daemon"); 438 exit(1); 439 } 440 441 if (pfh != NULL && pidfile_write(pfh) == -1) 442 syslog(LOG_WARNING, "pidfile_write: %m"); 443 444 sa.sa_handler = reapchild; 445 (void)sigaction(SIGCHLD, &sa, NULL); 446 447 #ifdef VIRTUAL_HOSTING 448 inithosts(family); 449 #endif 450 451 /* 452 * Open a socket, bind it to the FTP port, and start 453 * listening. 454 */ 455 ctl_sock = socksetup(family, bindname, bindport); 456 if (ctl_sock == NULL) 457 exit(1); 458 459 FD_ZERO(&defreadfds); 460 for (i = 1; i <= *ctl_sock; i++) { 461 FD_SET(ctl_sock[i], &defreadfds); 462 if (listen(ctl_sock[i], 32) < 0) { 463 syslog(LOG_ERR, "control listen: %m"); 464 exit(1); 465 } 466 if (maxfd < ctl_sock[i]) 467 maxfd = ctl_sock[i]; 468 } 469 470 /* 471 * Loop forever accepting connection requests and forking off 472 * children to handle them. 473 */ 474 while (1) { 475 FD_COPY(&defreadfds, &readfds); 476 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 477 if (nfds <= 0) { 478 if (nfds < 0 && errno != EINTR) 479 syslog(LOG_WARNING, "select: %m"); 480 continue; 481 } 482 483 pid = -1; 484 for (i = 1; i <= *ctl_sock; i++) 485 if (FD_ISSET(ctl_sock[i], &readfds)) { 486 addrlen = sizeof(his_addr); 487 fd = accept(ctl_sock[i], 488 (struct sockaddr *)&his_addr, 489 &addrlen); 490 if (fd == -1) { 491 syslog(LOG_WARNING, 492 "accept: %m"); 493 continue; 494 } 495 switch (pid = fork()) { 496 case 0: 497 /* child */ 498 (void) dup2(fd, s); 499 (void) dup2(fd, STDOUT_FILENO); 500 (void) close(fd); 501 for (i = 1; i <= *ctl_sock; i++) 502 close(ctl_sock[i]); 503 if (pfh != NULL) 504 pidfile_close(pfh); 505 goto gotchild; 506 case -1: 507 syslog(LOG_WARNING, "fork: %m"); 508 /* FALLTHROUGH */ 509 default: 510 close(fd); 511 } 512 } 513 } 514 } else { 515 addrlen = sizeof(his_addr); 516 if (getpeername(s, (struct sockaddr *)&his_addr, &addrlen) < 0) { 517 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 518 exit(1); 519 } 520 521 #ifdef VIRTUAL_HOSTING 522 if (his_addr.su_family == AF_INET6 && 523 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 524 family = AF_INET; 525 else 526 family = his_addr.su_family; 527 inithosts(family); 528 #endif 529 } 530 531 gotchild: 532 sa.sa_handler = SIG_DFL; 533 (void)sigaction(SIGCHLD, &sa, NULL); 534 535 sa.sa_handler = sigurg; 536 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 537 (void)sigaction(SIGURG, &sa, NULL); 538 539 sigfillset(&sa.sa_mask); /* block all signals in handler */ 540 sa.sa_flags = SA_RESTART; 541 sa.sa_handler = sigquit; 542 (void)sigaction(SIGHUP, &sa, NULL); 543 (void)sigaction(SIGINT, &sa, NULL); 544 (void)sigaction(SIGQUIT, &sa, NULL); 545 (void)sigaction(SIGTERM, &sa, NULL); 546 547 sa.sa_handler = lostconn; 548 (void)sigaction(SIGPIPE, &sa, NULL); 549 550 addrlen = sizeof(ctrl_addr); 551 if (getsockname(s, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 552 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 553 exit(1); 554 } 555 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 556 #ifdef VIRTUAL_HOSTING 557 /* select our identity from virtual host table */ 558 selecthost(&ctrl_addr); 559 #endif 560 #ifdef IP_TOS 561 if (ctrl_addr.su_family == AF_INET) 562 { 563 tos = IPTOS_LOWDELAY; 564 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 565 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 566 } 567 #endif 568 /* 569 * Disable Nagle on the control channel so that we don't have to wait 570 * for peer's ACK before issuing our next reply. 571 */ 572 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 573 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 574 575 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 576 577 (void)snprintf(wtmpid, sizeof(wtmpid), "%xftpd", getpid()); 578 579 /* Try to handle urgent data inline */ 580 #ifdef SO_OOBINLINE 581 if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 582 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 583 #endif 584 585 #ifdef F_SETOWN 586 if (fcntl(s, F_SETOWN, getpid()) == -1) 587 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 588 #endif 589 dolog((struct sockaddr *)&his_addr); 590 /* 591 * Set up default state 592 */ 593 data = -1; 594 type = TYPE_A; 595 form = FORM_N; 596 stru = STRU_F; 597 mode = MODE_S; 598 tmpline[0] = '\0'; 599 600 /* If logins are disabled, print out the message. */ 601 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 602 while (fgets(line, sizeof(line), fd) != NULL) { 603 if ((cp = strchr(line, '\n')) != NULL) 604 *cp = '\0'; 605 lreply(530, "%s", line); 606 } 607 (void) fflush(stdout); 608 (void) fclose(fd); 609 reply(530, "System not available."); 610 exit(0); 611 } 612 #ifdef VIRTUAL_HOSTING 613 fd = fopen(thishost->welcome, "r"); 614 #else 615 fd = fopen(_PATH_FTPWELCOME, "r"); 616 #endif 617 if (fd != NULL) { 618 while (fgets(line, sizeof(line), fd) != NULL) { 619 if ((cp = strchr(line, '\n')) != NULL) 620 *cp = '\0'; 621 lreply(220, "%s", line); 622 } 623 (void) fflush(stdout); 624 (void) fclose(fd); 625 /* reply(220,) must follow */ 626 } 627 #ifndef VIRTUAL_HOSTING 628 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 629 fatalerror("Ran out of memory."); 630 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 631 hostname[0] = '\0'; 632 hostname[MAXHOSTNAMELEN - 1] = '\0'; 633 #endif 634 if (hostinfo) 635 reply(220, "%s FTP server (%s) ready.", hostname, version); 636 else 637 reply(220, "FTP server ready."); 638 BLACKLIST_INIT(); 639 for (;;) 640 (void) yyparse(); 641 /* NOTREACHED */ 642 } 643 644 static void 645 lostconn(int signo) 646 { 647 648 if (ftpdebug) 649 syslog(LOG_DEBUG, "lost connection"); 650 dologout(1); 651 } 652 653 static void 654 sigquit(int signo) 655 { 656 657 syslog(LOG_ERR, "got signal %d", signo); 658 dologout(1); 659 } 660 661 #ifdef VIRTUAL_HOSTING 662 /* 663 * read in virtual host tables (if they exist) 664 */ 665 666 static void 667 inithosts(int family) 668 { 669 int insert; 670 size_t len; 671 FILE *fp; 672 char *cp, *mp, *line; 673 char *hostname; 674 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 675 struct ftphost *hrp, *lhrp; 676 struct addrinfo hints, *res, *ai; 677 678 /* 679 * Fill in the default host information 680 */ 681 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 682 fatalerror("Ran out of memory."); 683 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 684 hostname[0] = '\0'; 685 hostname[MAXHOSTNAMELEN - 1] = '\0'; 686 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 687 fatalerror("Ran out of memory."); 688 hrp->hostname = hostname; 689 hrp->hostinfo = NULL; 690 691 memset(&hints, 0, sizeof(hints)); 692 hints.ai_flags = AI_PASSIVE; 693 hints.ai_family = family; 694 hints.ai_socktype = SOCK_STREAM; 695 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 696 hrp->hostinfo = res; 697 hrp->statfile = _PATH_FTPDSTATFILE; 698 hrp->welcome = _PATH_FTPWELCOME; 699 hrp->loginmsg = _PATH_FTPLOGINMESG; 700 hrp->anonuser = "ftp"; 701 hrp->next = NULL; 702 thishost = firsthost = lhrp = hrp; 703 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 704 int addrsize, gothost; 705 void *addr; 706 struct hostent *hp; 707 708 while ((line = fgetln(fp, &len)) != NULL) { 709 int i, hp_error; 710 711 /* skip comments */ 712 if (line[0] == '#') 713 continue; 714 if (line[len - 1] == '\n') { 715 line[len - 1] = '\0'; 716 mp = NULL; 717 } else { 718 if ((mp = malloc(len + 1)) == NULL) 719 fatalerror("Ran out of memory."); 720 memcpy(mp, line, len); 721 mp[len] = '\0'; 722 line = mp; 723 } 724 cp = strtok(line, " \t"); 725 /* skip empty lines */ 726 if (cp == NULL) 727 goto nextline; 728 vhost = cp; 729 730 /* set defaults */ 731 anonuser = "ftp"; 732 statfile = _PATH_FTPDSTATFILE; 733 welcome = _PATH_FTPWELCOME; 734 loginmsg = _PATH_FTPLOGINMESG; 735 736 /* 737 * Preparse the line so we can use its info 738 * for all the addresses associated with 739 * the virtual host name. 740 * Field 0, the virtual host name, is special: 741 * it's already parsed off and will be strdup'ed 742 * later, after we know its canonical form. 743 */ 744 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 745 if (*cp != '-' && (cp = strdup(cp))) 746 switch (i) { 747 case 1: /* anon user permissions */ 748 anonuser = cp; 749 break; 750 case 2: /* statistics file */ 751 statfile = cp; 752 break; 753 case 3: /* welcome message */ 754 welcome = cp; 755 break; 756 case 4: /* login message */ 757 loginmsg = cp; 758 break; 759 default: /* programming error */ 760 abort(); 761 /* NOTREACHED */ 762 } 763 764 hints.ai_flags = AI_PASSIVE; 765 hints.ai_family = family; 766 hints.ai_socktype = SOCK_STREAM; 767 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 768 goto nextline; 769 for (ai = res; ai != NULL && ai->ai_addr != NULL; 770 ai = ai->ai_next) { 771 772 gothost = 0; 773 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 774 struct addrinfo *hi; 775 776 for (hi = hrp->hostinfo; hi != NULL; 777 hi = hi->ai_next) 778 if (hi->ai_addrlen == ai->ai_addrlen && 779 memcmp(hi->ai_addr, 780 ai->ai_addr, 781 ai->ai_addr->sa_len) == 0) { 782 gothost++; 783 break; 784 } 785 if (gothost) 786 break; 787 } 788 if (hrp == NULL) { 789 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 790 goto nextline; 791 hrp->hostname = NULL; 792 insert = 1; 793 } else { 794 if (hrp->hostinfo && hrp->hostinfo != res) 795 freeaddrinfo(hrp->hostinfo); 796 insert = 0; /* host already in the chain */ 797 } 798 hrp->hostinfo = res; 799 800 /* 801 * determine hostname to use. 802 * force defined name if there is a valid alias 803 * otherwise fallback to primary hostname 804 */ 805 /* XXX: getaddrinfo() can't do alias check */ 806 switch(hrp->hostinfo->ai_family) { 807 case AF_INET: 808 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 809 addrsize = sizeof(struct in_addr); 810 break; 811 case AF_INET6: 812 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 813 addrsize = sizeof(struct in6_addr); 814 break; 815 default: 816 /* should not reach here */ 817 freeaddrinfo(hrp->hostinfo); 818 if (insert) 819 free(hrp); /*not in chain, can free*/ 820 else 821 hrp->hostinfo = NULL; /*mark as blank*/ 822 goto nextline; 823 /* NOTREACHED */ 824 } 825 if ((hp = getipnodebyaddr(addr, addrsize, 826 hrp->hostinfo->ai_family, 827 &hp_error)) != NULL) { 828 if (strcmp(vhost, hp->h_name) != 0) { 829 if (hp->h_aliases == NULL) 830 vhost = hp->h_name; 831 else { 832 i = 0; 833 while (hp->h_aliases[i] && 834 strcmp(vhost, hp->h_aliases[i]) != 0) 835 ++i; 836 if (hp->h_aliases[i] == NULL) 837 vhost = hp->h_name; 838 } 839 } 840 } 841 if (hrp->hostname && 842 strcmp(hrp->hostname, vhost) != 0) { 843 free(hrp->hostname); 844 hrp->hostname = NULL; 845 } 846 if (hrp->hostname == NULL && 847 (hrp->hostname = strdup(vhost)) == NULL) { 848 freeaddrinfo(hrp->hostinfo); 849 hrp->hostinfo = NULL; /* mark as blank */ 850 if (hp) 851 freehostent(hp); 852 goto nextline; 853 } 854 hrp->anonuser = anonuser; 855 hrp->statfile = statfile; 856 hrp->welcome = welcome; 857 hrp->loginmsg = loginmsg; 858 if (insert) { 859 hrp->next = NULL; 860 lhrp->next = hrp; 861 lhrp = hrp; 862 } 863 if (hp) 864 freehostent(hp); 865 } 866 nextline: 867 if (mp) 868 free(mp); 869 } 870 (void) fclose(fp); 871 } 872 } 873 874 static void 875 selecthost(union sockunion *su) 876 { 877 struct ftphost *hrp; 878 u_int16_t port; 879 #ifdef INET6 880 struct in6_addr *mapped_in6 = NULL; 881 #endif 882 struct addrinfo *hi; 883 884 #ifdef INET6 885 /* 886 * XXX IPv4 mapped IPv6 addr consideraton, 887 * specified in rfc2373. 888 */ 889 if (su->su_family == AF_INET6 && 890 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 891 mapped_in6 = &su->su_sin6.sin6_addr; 892 #endif 893 894 hrp = thishost = firsthost; /* default */ 895 port = su->su_port; 896 su->su_port = 0; 897 while (hrp != NULL) { 898 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 899 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 900 thishost = hrp; 901 goto found; 902 } 903 #ifdef INET6 904 /* XXX IPv4 mapped IPv6 addr consideraton */ 905 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 906 (memcmp(&mapped_in6->s6_addr[12], 907 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 908 sizeof(struct in_addr)) == 0)) { 909 thishost = hrp; 910 goto found; 911 } 912 #endif 913 } 914 hrp = hrp->next; 915 } 916 found: 917 su->su_port = port; 918 /* setup static variables as appropriate */ 919 hostname = thishost->hostname; 920 ftpuser = thishost->anonuser; 921 } 922 #endif 923 924 /* 925 * Helper function for sgetpwnam(). 926 */ 927 static char * 928 sgetsave(char *s) 929 { 930 char *new = malloc(strlen(s) + 1); 931 932 if (new == NULL) { 933 reply(421, "Ran out of memory."); 934 dologout(1); 935 /* NOTREACHED */ 936 } 937 (void) strcpy(new, s); 938 return (new); 939 } 940 941 /* 942 * Save the result of a getpwnam. Used for USER command, since 943 * the data returned must not be clobbered by any other command 944 * (e.g., globbing). 945 * NB: The data returned by sgetpwnam() will remain valid until 946 * the next call to this function. Its difference from getpwnam() 947 * is that sgetpwnam() is known to be called from ftpd code only. 948 */ 949 static struct passwd * 950 sgetpwnam(char *name) 951 { 952 static struct passwd save; 953 struct passwd *p; 954 955 if ((p = getpwnam(name)) == NULL) 956 return (p); 957 if (save.pw_name) { 958 free(save.pw_name); 959 free(save.pw_passwd); 960 free(save.pw_class); 961 free(save.pw_gecos); 962 free(save.pw_dir); 963 free(save.pw_shell); 964 } 965 save = *p; 966 save.pw_name = sgetsave(p->pw_name); 967 save.pw_passwd = sgetsave(p->pw_passwd); 968 save.pw_class = sgetsave(p->pw_class); 969 save.pw_gecos = sgetsave(p->pw_gecos); 970 save.pw_dir = sgetsave(p->pw_dir); 971 save.pw_shell = sgetsave(p->pw_shell); 972 return (&save); 973 } 974 975 static int login_attempts; /* number of failed login attempts */ 976 static int askpasswd; /* had user command, ask for passwd */ 977 static char curname[MAXLOGNAME]; /* current USER name */ 978 979 /* 980 * USER command. 981 * Sets global passwd pointer pw if named account exists and is acceptable; 982 * sets askpasswd if a PASS command is expected. If logged in previously, 983 * need to reset state. If name is "ftp" or "anonymous", the name is not in 984 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 985 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 986 * requesting login privileges. Disallow anyone who does not have a standard 987 * shell as returned by getusershell(). Disallow anyone mentioned in the file 988 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 989 */ 990 void 991 user(char *name) 992 { 993 int ecode; 994 char *cp, *shell; 995 996 if (logged_in) { 997 if (guest) { 998 reply(530, "Can't change user from guest login."); 999 return; 1000 } else if (dochroot) { 1001 reply(530, "Can't change user from chroot user."); 1002 return; 1003 } 1004 end_login(); 1005 } 1006 1007 guest = 0; 1008 #ifdef VIRTUAL_HOSTING 1009 pw = sgetpwnam(thishost->anonuser); 1010 #else 1011 pw = sgetpwnam("ftp"); 1012 #endif 1013 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1014 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL, &ecode) || 1015 (ecode != 0 && ecode != ENOENT)) 1016 reply(530, "User %s access denied.", name); 1017 else if (checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL, &ecode) || 1018 (ecode != 0 && ecode != ENOENT)) 1019 reply(530, "User %s access denied.", name); 1020 else if (pw != NULL) { 1021 guest = 1; 1022 askpasswd = 1; 1023 reply(331, 1024 "Guest login ok, send your email address as password."); 1025 } else 1026 reply(530, "User %s unknown.", name); 1027 if (!askpasswd && logging) 1028 syslog(LOG_NOTICE, 1029 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1030 return; 1031 } 1032 if (anon_only != 0) { 1033 reply(530, "Sorry, only anonymous ftp allowed."); 1034 return; 1035 } 1036 1037 if ((pw = sgetpwnam(name))) { 1038 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1039 shell = _PATH_BSHELL; 1040 setusershell(); 1041 while ((cp = getusershell()) != NULL) 1042 if (strcmp(cp, shell) == 0) 1043 break; 1044 endusershell(); 1045 1046 if (cp == NULL || 1047 (checkuser(_PATH_FTPUSERS, name, 1, NULL, &ecode) || 1048 (ecode != 0 && ecode != ENOENT))) { 1049 reply(530, "User %s access denied.", name); 1050 if (logging) 1051 syslog(LOG_NOTICE, 1052 "FTP LOGIN REFUSED FROM %s, %s", 1053 remotehost, name); 1054 pw = NULL; 1055 return; 1056 } 1057 } 1058 if (logging) 1059 strlcpy(curname, name, sizeof(curname)); 1060 1061 reply(331, "Password required for %s.", name); 1062 askpasswd = 1; 1063 /* 1064 * Delay before reading passwd after first failed 1065 * attempt to slow down passwd-guessing programs. 1066 */ 1067 if (login_attempts) 1068 sleep(login_attempts); 1069 } 1070 1071 /* 1072 * Check if a user is in the file "fname", 1073 * return a pointer to a malloc'd string with the rest 1074 * of the matching line in "residue" if not NULL. 1075 */ 1076 static int 1077 checkuser(char *fname, char *name, int pwset, char **residue, int *ecode) 1078 { 1079 FILE *fd; 1080 int found = 0; 1081 size_t len; 1082 char *line, *mp, *p; 1083 1084 if (ecode != NULL) 1085 *ecode = 0; 1086 if ((fd = fopen(fname, "r")) != NULL) { 1087 while (!found && (line = fgetln(fd, &len)) != NULL) { 1088 /* skip comments */ 1089 if (line[0] == '#') 1090 continue; 1091 if (line[len - 1] == '\n') { 1092 line[len - 1] = '\0'; 1093 mp = NULL; 1094 } else { 1095 if ((mp = malloc(len + 1)) == NULL) 1096 fatalerror("Ran out of memory."); 1097 memcpy(mp, line, len); 1098 mp[len] = '\0'; 1099 line = mp; 1100 } 1101 /* avoid possible leading and trailing whitespace */ 1102 p = strtok(line, " \t"); 1103 /* skip empty lines */ 1104 if (p == NULL) 1105 goto nextline; 1106 /* 1107 * if first chr is '@', check group membership 1108 */ 1109 if (p[0] == '@') { 1110 int i = 0; 1111 struct group *grp; 1112 1113 if (p[1] == '\0') /* single @ matches anyone */ 1114 found = 1; 1115 else { 1116 if ((grp = getgrnam(p+1)) == NULL) 1117 goto nextline; 1118 /* 1119 * Check user's default group 1120 */ 1121 if (pwset && grp->gr_gid == pw->pw_gid) 1122 found = 1; 1123 /* 1124 * Check supplementary groups 1125 */ 1126 while (!found && grp->gr_mem[i]) 1127 found = strcmp(name, 1128 grp->gr_mem[i++]) 1129 == 0; 1130 } 1131 } 1132 /* 1133 * Otherwise, just check for username match 1134 */ 1135 else 1136 found = strcmp(p, name) == 0; 1137 /* 1138 * Save the rest of line to "residue" if matched 1139 */ 1140 if (found && residue) { 1141 if ((p = strtok(NULL, "")) != NULL) 1142 p += strspn(p, " \t"); 1143 if (p && *p) { 1144 if ((*residue = strdup(p)) == NULL) 1145 fatalerror("Ran out of memory."); 1146 } else 1147 *residue = NULL; 1148 } 1149 nextline: 1150 if (mp) 1151 free(mp); 1152 } 1153 (void) fclose(fd); 1154 } else if (ecode != NULL) 1155 *ecode = errno; 1156 return (found); 1157 } 1158 1159 /* 1160 * Terminate login as previous user, if any, resetting state; 1161 * used when USER command is given or login fails. 1162 */ 1163 static void 1164 end_login(void) 1165 { 1166 #ifdef USE_PAM 1167 int e; 1168 #endif 1169 1170 (void) seteuid(0); 1171 #ifdef LOGIN_CAP 1172 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 1173 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 1174 LOGIN_SETENV)); 1175 #endif 1176 if (logged_in && dowtmp) 1177 ftpd_logwtmp(wtmpid, NULL, NULL); 1178 pw = NULL; 1179 #ifdef USE_PAM 1180 if (pamh) { 1181 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1182 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1183 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1184 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1185 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1186 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1187 pamh = NULL; 1188 } 1189 #endif 1190 logged_in = 0; 1191 guest = 0; 1192 dochroot = 0; 1193 } 1194 1195 #ifdef USE_PAM 1196 1197 /* 1198 * the following code is stolen from imap-uw PAM authentication module and 1199 * login.c 1200 */ 1201 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1202 1203 struct cred_t { 1204 const char *uname; /* user name */ 1205 const char *pass; /* password */ 1206 }; 1207 typedef struct cred_t cred_t; 1208 1209 static int 1210 auth_conv(int num_msg, const struct pam_message **msg, 1211 struct pam_response **resp, void *appdata) 1212 { 1213 int i; 1214 cred_t *cred = (cred_t *) appdata; 1215 struct pam_response *reply; 1216 1217 reply = calloc(num_msg, sizeof *reply); 1218 if (reply == NULL) 1219 return PAM_BUF_ERR; 1220 1221 for (i = 0; i < num_msg; i++) { 1222 switch (msg[i]->msg_style) { 1223 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1224 reply[i].resp_retcode = PAM_SUCCESS; 1225 reply[i].resp = COPY_STRING(cred->uname); 1226 /* PAM frees resp. */ 1227 break; 1228 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1229 reply[i].resp_retcode = PAM_SUCCESS; 1230 reply[i].resp = COPY_STRING(cred->pass); 1231 /* PAM frees resp. */ 1232 break; 1233 case PAM_TEXT_INFO: 1234 case PAM_ERROR_MSG: 1235 reply[i].resp_retcode = PAM_SUCCESS; 1236 reply[i].resp = NULL; 1237 break; 1238 default: /* unknown message style */ 1239 free(reply); 1240 return PAM_CONV_ERR; 1241 } 1242 } 1243 1244 *resp = reply; 1245 return PAM_SUCCESS; 1246 } 1247 1248 /* 1249 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1250 * authenticated, or 1 if not authenticated. If some sort of PAM system 1251 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1252 * function returns -1. This can be used as an indication that we should 1253 * fall back to a different authentication mechanism. 1254 */ 1255 static int 1256 auth_pam(struct passwd **ppw, const char *pass) 1257 { 1258 const char *tmpl_user; 1259 const void *item; 1260 int rval; 1261 int e; 1262 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1263 struct pam_conv conv = { &auth_conv, &auth_cred }; 1264 1265 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1266 if (e != PAM_SUCCESS) { 1267 /* 1268 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1269 * if context creation has failed in the first place. 1270 */ 1271 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1272 return -1; 1273 } 1274 1275 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1276 if (e != PAM_SUCCESS) { 1277 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1278 pam_strerror(pamh, e)); 1279 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1280 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1281 } 1282 pamh = NULL; 1283 return -1; 1284 } 1285 1286 e = pam_authenticate(pamh, 0); 1287 switch (e) { 1288 case PAM_SUCCESS: 1289 /* 1290 * With PAM we support the concept of a "template" 1291 * user. The user enters a login name which is 1292 * authenticated by PAM, usually via a remote service 1293 * such as RADIUS or TACACS+. If authentication 1294 * succeeds, a different but related "template" name 1295 * is used for setting the credentials, shell, and 1296 * home directory. The name the user enters need only 1297 * exist on the remote authentication server, but the 1298 * template name must be present in the local password 1299 * database. 1300 * 1301 * This is supported by two various mechanisms in the 1302 * individual modules. However, from the application's 1303 * point of view, the template user is always passed 1304 * back as a changed value of the PAM_USER item. 1305 */ 1306 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1307 PAM_SUCCESS) { 1308 tmpl_user = (const char *) item; 1309 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1310 *ppw = getpwnam(tmpl_user); 1311 } else 1312 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1313 pam_strerror(pamh, e)); 1314 rval = 0; 1315 break; 1316 1317 case PAM_AUTH_ERR: 1318 case PAM_USER_UNKNOWN: 1319 case PAM_MAXTRIES: 1320 rval = 1; 1321 break; 1322 1323 default: 1324 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1325 rval = -1; 1326 break; 1327 } 1328 1329 if (rval == 0) { 1330 e = pam_acct_mgmt(pamh, 0); 1331 if (e != PAM_SUCCESS) { 1332 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1333 pam_strerror(pamh, e)); 1334 rval = 1; 1335 } 1336 } 1337 1338 if (rval != 0) { 1339 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1340 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1341 } 1342 pamh = NULL; 1343 } 1344 return rval; 1345 } 1346 1347 #endif /* USE_PAM */ 1348 1349 void 1350 pass(char *passwd) 1351 { 1352 int rval, ecode; 1353 FILE *fd; 1354 #ifdef LOGIN_CAP 1355 login_cap_t *lc = NULL; 1356 #endif 1357 #ifdef USE_PAM 1358 int e; 1359 #endif 1360 char *residue = NULL; 1361 char *xpasswd; 1362 1363 if (logged_in || askpasswd == 0) { 1364 reply(503, "Login with USER first."); 1365 return; 1366 } 1367 askpasswd = 0; 1368 if (!guest) { /* "ftp" is only account allowed no password */ 1369 if (pw == NULL) { 1370 rval = 1; /* failure below */ 1371 goto skip; 1372 } 1373 #ifdef USE_PAM 1374 rval = auth_pam(&pw, passwd); 1375 if (rval >= 0) { 1376 goto skip; 1377 } 1378 #endif 1379 xpasswd = crypt(passwd, pw->pw_passwd); 1380 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1381 xpasswd = ":"; 1382 rval = strcmp(pw->pw_passwd, xpasswd); 1383 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1384 rval = 1; /* failure */ 1385 skip: 1386 /* 1387 * If rval == 1, the user failed the authentication check 1388 * above. If rval == 0, either PAM or local authentication 1389 * succeeded. 1390 */ 1391 if (rval) { 1392 reply(530, "Login incorrect."); 1393 BLACKLIST_NOTIFY(BLACKLIST_AUTH_FAIL, STDIN_FILENO, "Login incorrect"); 1394 if (logging) { 1395 syslog(LOG_NOTICE, 1396 "FTP LOGIN FAILED FROM %s", 1397 remotehost); 1398 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1399 "FTP LOGIN FAILED FROM %s, %s", 1400 remotehost, curname); 1401 } 1402 pw = NULL; 1403 if (login_attempts++ >= 5) { 1404 syslog(LOG_NOTICE, 1405 "repeated login failures from %s", 1406 remotehost); 1407 exit(0); 1408 } 1409 return; 1410 } else { 1411 BLACKLIST_NOTIFY(BLACKLIST_AUTH_OK, STDIN_FILENO, "Login successful"); 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 (void) 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 setusercontext(lc, pw, 0, LOGIN_SETALL & 1445 ~(LOGIN_SETRESOURCES | LOGIN_SETUSER | LOGIN_SETPATH | LOGIN_SETENV)); 1446 #else 1447 setlogin(pw->pw_name); 1448 (void) initgroups(pw->pw_name, pw->pw_gid); 1449 #endif 1450 1451 #ifdef USE_PAM 1452 if (pamh) { 1453 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1454 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1455 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1456 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1457 } 1458 } 1459 #endif 1460 1461 dochroot = 1462 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue, &ecode) 1463 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1464 || login_getcapbool(lc, "ftp-chroot", 0) 1465 #endif 1466 ; 1467 /* 1468 * It is possible that checkuser() failed to open the chroot file. 1469 * If this is the case, report that logins are un-available, since we 1470 * have no way of checking whether or not the user should be chrooted. 1471 * We ignore ENOENT since it is not required that this file be present. 1472 */ 1473 if (ecode != 0 && ecode != ENOENT) { 1474 reply(530, "Login not available right now."); 1475 return; 1476 } 1477 chrootdir = NULL; 1478 1479 /* Disable wtmp logging when chrooting. */ 1480 if (dochroot || guest) 1481 dowtmp = 0; 1482 if (dowtmp) 1483 ftpd_logwtmp(wtmpid, pw->pw_name, 1484 (struct sockaddr *)&his_addr); 1485 logged_in = 1; 1486 1487 #ifdef LOGIN_CAP 1488 setusercontext(lc, pw, 0, LOGIN_SETRESOURCES); 1489 #endif 1490 1491 if (guest && stats && statfd < 0) { 1492 #ifdef VIRTUAL_HOSTING 1493 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1494 #else 1495 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1496 #endif 1497 if (statfd < 0) 1498 stats = 0; 1499 } 1500 1501 /* 1502 * For a chrooted local user, 1503 * a) see whether ftpchroot(5) specifies a chroot directory, 1504 * b) extract the directory pathname from the line, 1505 * c) expand it to the absolute pathname if necessary. 1506 */ 1507 if (dochroot && residue && 1508 (chrootdir = strtok(residue, " \t")) != NULL) { 1509 if (chrootdir[0] != '/') 1510 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1511 else 1512 chrootdir = strdup(chrootdir); /* make it permanent */ 1513 if (chrootdir == NULL) 1514 fatalerror("Ran out of memory."); 1515 } 1516 if (guest || dochroot) { 1517 /* 1518 * If no chroot directory set yet, use the login directory. 1519 * Copy it so it can be modified while pw->pw_dir stays intact. 1520 */ 1521 if (chrootdir == NULL && 1522 (chrootdir = strdup(pw->pw_dir)) == NULL) 1523 fatalerror("Ran out of memory."); 1524 /* 1525 * Check for the "/chroot/./home" syntax, 1526 * separate the chroot and home directory pathnames. 1527 */ 1528 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1529 *(homedir++) = '\0'; /* wipe '/' */ 1530 homedir++; /* skip '.' */ 1531 } else { 1532 /* 1533 * We MUST do a chdir() after the chroot. Otherwise 1534 * the old current directory will be accessible as "." 1535 * outside the new root! 1536 */ 1537 homedir = "/"; 1538 } 1539 /* 1540 * Finally, do chroot() 1541 */ 1542 if (chroot(chrootdir) < 0) { 1543 reply(550, "Can't change root."); 1544 goto bad; 1545 } 1546 __FreeBSD_libc_enter_restricted_mode(); 1547 } else /* real user w/o chroot */ 1548 homedir = pw->pw_dir; 1549 /* 1550 * Set euid *before* doing chdir() so 1551 * a) the user won't be carried to a directory that he couldn't reach 1552 * on his own due to no permission to upper path components, 1553 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1554 * (uid 0 has no root power over NFS if not mapped explicitly.) 1555 */ 1556 if (seteuid(pw->pw_uid) < 0) { 1557 if (guest || dochroot) { 1558 fatalerror("Can't set uid."); 1559 } else { 1560 reply(550, "Can't set uid."); 1561 goto bad; 1562 } 1563 } 1564 /* 1565 * Do not allow the session to live if we're chroot()'ed and chdir() 1566 * fails. Otherwise the chroot jail can be escaped. 1567 */ 1568 if (chdir(homedir) < 0) { 1569 if (guest || dochroot) { 1570 fatalerror("Can't change to base directory."); 1571 } else { 1572 if (chdir("/") < 0) { 1573 reply(550, "Root is inaccessible."); 1574 goto bad; 1575 } 1576 lreply(230, "No directory! Logging in with home=/."); 1577 } 1578 } 1579 1580 /* 1581 * Display a login message, if it exists. 1582 * N.B. reply(230,) must follow the message. 1583 */ 1584 #ifdef VIRTUAL_HOSTING 1585 fd = fopen(thishost->loginmsg, "r"); 1586 #else 1587 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1588 #endif 1589 if (fd != NULL) { 1590 char *cp, line[LINE_MAX]; 1591 1592 while (fgets(line, sizeof(line), fd) != NULL) { 1593 if ((cp = strchr(line, '\n')) != NULL) 1594 *cp = '\0'; 1595 lreply(230, "%s", line); 1596 } 1597 (void) fflush(stdout); 1598 (void) fclose(fd); 1599 } 1600 if (guest) { 1601 if (ident != NULL) 1602 free(ident); 1603 ident = strdup(passwd); 1604 if (ident == NULL) 1605 fatalerror("Ran out of memory."); 1606 1607 reply(230, "Guest login ok, access restrictions apply."); 1608 #ifdef SETPROCTITLE 1609 #ifdef VIRTUAL_HOSTING 1610 if (thishost != firsthost) 1611 snprintf(proctitle, sizeof(proctitle), 1612 "%s: anonymous(%s)/%s", remotehost, hostname, 1613 passwd); 1614 else 1615 #endif 1616 snprintf(proctitle, sizeof(proctitle), 1617 "%s: anonymous/%s", remotehost, passwd); 1618 setproctitle("%s", proctitle); 1619 #endif /* SETPROCTITLE */ 1620 if (logging) 1621 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1622 remotehost, passwd); 1623 } else { 1624 if (dochroot) 1625 reply(230, "User %s logged in, " 1626 "access restrictions apply.", pw->pw_name); 1627 else 1628 reply(230, "User %s logged in.", pw->pw_name); 1629 1630 #ifdef SETPROCTITLE 1631 snprintf(proctitle, sizeof(proctitle), 1632 "%s: user/%s", remotehost, pw->pw_name); 1633 setproctitle("%s", proctitle); 1634 #endif /* SETPROCTITLE */ 1635 if (logging) 1636 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1637 remotehost, pw->pw_name); 1638 } 1639 if (logging && (guest || dochroot)) 1640 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1641 #ifdef LOGIN_CAP 1642 login_close(lc); 1643 #endif 1644 if (residue) 1645 free(residue); 1646 return; 1647 bad: 1648 /* Forget all about it... */ 1649 #ifdef LOGIN_CAP 1650 login_close(lc); 1651 #endif 1652 if (residue) 1653 free(residue); 1654 end_login(); 1655 } 1656 1657 void 1658 retrieve(char *cmd, char *name) 1659 { 1660 FILE *fin, *dout; 1661 struct stat st; 1662 int (*closefunc)(FILE *); 1663 time_t start; 1664 char line[BUFSIZ]; 1665 1666 if (cmd == 0) { 1667 fin = fopen(name, "r"), closefunc = fclose; 1668 st.st_size = 0; 1669 } else { 1670 (void) snprintf(line, sizeof(line), cmd, name); 1671 name = line; 1672 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1673 st.st_size = -1; 1674 st.st_blksize = BUFSIZ; 1675 } 1676 if (fin == NULL) { 1677 if (errno != 0) { 1678 perror_reply(550, name); 1679 if (cmd == 0) { 1680 LOGCMD("get", name); 1681 } 1682 } 1683 return; 1684 } 1685 byte_count = -1; 1686 if (cmd == 0) { 1687 if (fstat(fileno(fin), &st) < 0) { 1688 perror_reply(550, name); 1689 goto done; 1690 } 1691 if (!S_ISREG(st.st_mode)) { 1692 /* 1693 * Never sending a raw directory is a workaround 1694 * for buggy clients that will attempt to RETR 1695 * a directory before listing it, e.g., Mozilla. 1696 * Preventing a guest from getting irregular files 1697 * is a simple security measure. 1698 */ 1699 if (S_ISDIR(st.st_mode) || guest) { 1700 reply(550, "%s: not a plain file.", name); 1701 goto done; 1702 } 1703 st.st_size = -1; 1704 /* st.st_blksize is set for all descriptor types */ 1705 } 1706 } 1707 if (restart_point) { 1708 if (type == TYPE_A) { 1709 off_t i, n; 1710 int c; 1711 1712 n = restart_point; 1713 i = 0; 1714 while (i++ < n) { 1715 if ((c=getc(fin)) == EOF) { 1716 perror_reply(550, name); 1717 goto done; 1718 } 1719 if (c == '\n') 1720 i++; 1721 } 1722 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1723 perror_reply(550, name); 1724 goto done; 1725 } 1726 } 1727 dout = dataconn(name, st.st_size, "w"); 1728 if (dout == NULL) 1729 goto done; 1730 time(&start); 1731 send_data(fin, dout, st.st_blksize, st.st_size, 1732 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1733 if (cmd == 0 && guest && stats && byte_count > 0) 1734 logxfer(name, byte_count, start); 1735 (void) fclose(dout); 1736 data = -1; 1737 pdata = -1; 1738 done: 1739 if (cmd == 0) 1740 LOGBYTES("get", name, byte_count); 1741 (*closefunc)(fin); 1742 } 1743 1744 void 1745 store(char *name, char *mode, int unique) 1746 { 1747 int fd; 1748 FILE *fout, *din; 1749 int (*closefunc)(FILE *); 1750 1751 if (*mode == 'a') { /* APPE */ 1752 if (unique) { 1753 /* Programming error */ 1754 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1755 unique = 0; 1756 } 1757 if (guest && noguestmod) { 1758 reply(550, "Appending to existing file denied."); 1759 goto err; 1760 } 1761 restart_point = 0; /* not affected by preceding REST */ 1762 } 1763 if (unique) /* STOU overrides REST */ 1764 restart_point = 0; 1765 if (guest && noguestmod) { 1766 if (restart_point) { /* guest STOR w/REST */ 1767 reply(550, "Modifying existing file denied."); 1768 goto err; 1769 } else /* treat guest STOR as STOU */ 1770 unique = 1; 1771 } 1772 1773 if (restart_point) 1774 mode = "r+"; /* so ASCII manual seek can work */ 1775 if (unique) { 1776 if ((fd = guniquefd(name, &name)) < 0) 1777 goto err; 1778 fout = fdopen(fd, mode); 1779 } else 1780 fout = fopen(name, mode); 1781 closefunc = fclose; 1782 if (fout == NULL) { 1783 perror_reply(553, name); 1784 goto err; 1785 } 1786 byte_count = -1; 1787 if (restart_point) { 1788 if (type == TYPE_A) { 1789 off_t i, n; 1790 int c; 1791 1792 n = restart_point; 1793 i = 0; 1794 while (i++ < n) { 1795 if ((c=getc(fout)) == EOF) { 1796 perror_reply(550, name); 1797 goto done; 1798 } 1799 if (c == '\n') 1800 i++; 1801 } 1802 /* 1803 * We must do this seek to "current" position 1804 * because we are changing from reading to 1805 * writing. 1806 */ 1807 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1808 perror_reply(550, name); 1809 goto done; 1810 } 1811 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1812 perror_reply(550, name); 1813 goto done; 1814 } 1815 } 1816 din = dataconn(name, -1, "r"); 1817 if (din == NULL) 1818 goto done; 1819 if (receive_data(din, fout) == 0) { 1820 if (unique) 1821 reply(226, "Transfer complete (unique file name:%s).", 1822 name); 1823 else 1824 reply(226, "Transfer complete."); 1825 } 1826 (void) fclose(din); 1827 data = -1; 1828 pdata = -1; 1829 done: 1830 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1831 (*closefunc)(fout); 1832 return; 1833 err: 1834 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1835 return; 1836 } 1837 1838 static FILE * 1839 getdatasock(char *mode) 1840 { 1841 int on = 1, s, t, tries; 1842 1843 if (data >= 0) 1844 return (fdopen(data, mode)); 1845 1846 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1847 if (s < 0) 1848 goto bad; 1849 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1850 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1851 /* anchor socket to avoid multi-homing problems */ 1852 data_source = ctrl_addr; 1853 data_source.su_port = htons(dataport); 1854 (void) seteuid(0); 1855 for (tries = 1; ; tries++) { 1856 /* 1857 * We should loop here since it's possible that 1858 * another ftpd instance has passed this point and is 1859 * trying to open a data connection in active mode now. 1860 * Until the other connection is opened, we'll be getting 1861 * EADDRINUSE because no SOCK_STREAM sockets in the system 1862 * can share both local and remote addresses, localIP:20 1863 * and *:* in this case. 1864 */ 1865 if (bind(s, (struct sockaddr *)&data_source, 1866 data_source.su_len) >= 0) 1867 break; 1868 if (errno != EADDRINUSE || tries > 10) 1869 goto bad; 1870 sleep(tries); 1871 } 1872 (void) seteuid(pw->pw_uid); 1873 #ifdef IP_TOS 1874 if (data_source.su_family == AF_INET) 1875 { 1876 on = IPTOS_THROUGHPUT; 1877 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1878 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1879 } 1880 #endif 1881 #ifdef TCP_NOPUSH 1882 /* 1883 * Turn off push flag to keep sender TCP from sending short packets 1884 * at the boundaries of each write(). 1885 */ 1886 on = 1; 1887 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1888 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1889 #endif 1890 return (fdopen(s, mode)); 1891 bad: 1892 /* Return the real value of errno (close may change it) */ 1893 t = errno; 1894 (void) seteuid(pw->pw_uid); 1895 (void) close(s); 1896 errno = t; 1897 return (NULL); 1898 } 1899 1900 static FILE * 1901 dataconn(char *name, off_t size, char *mode) 1902 { 1903 char sizebuf[32]; 1904 FILE *file; 1905 int retry = 0, tos, conerrno; 1906 1907 file_size = size; 1908 byte_count = 0; 1909 if (size != -1) 1910 (void) snprintf(sizebuf, sizeof(sizebuf), 1911 " (%jd bytes)", (intmax_t)size); 1912 else 1913 *sizebuf = '\0'; 1914 if (pdata >= 0) { 1915 union sockunion from; 1916 socklen_t fromlen = ctrl_addr.su_len; 1917 int flags, s; 1918 struct timeval timeout; 1919 fd_set set; 1920 1921 FD_ZERO(&set); 1922 FD_SET(pdata, &set); 1923 1924 timeout.tv_usec = 0; 1925 timeout.tv_sec = 120; 1926 1927 /* 1928 * Granted a socket is in the blocking I/O mode, 1929 * accept() will block after a successful select() 1930 * if the selected connection dies in between. 1931 * Therefore set the non-blocking I/O flag here. 1932 */ 1933 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1934 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1935 goto pdata_err; 1936 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1937 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1938 goto pdata_err; 1939 (void) close(pdata); 1940 pdata = s; 1941 /* 1942 * Unset the inherited non-blocking I/O flag 1943 * on the child socket so stdio can work on it. 1944 */ 1945 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1946 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1947 goto pdata_err; 1948 #ifdef IP_TOS 1949 if (from.su_family == AF_INET) 1950 { 1951 tos = IPTOS_THROUGHPUT; 1952 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1953 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1954 } 1955 #endif 1956 reply(150, "Opening %s mode data connection for '%s'%s.", 1957 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1958 return (fdopen(pdata, mode)); 1959 pdata_err: 1960 reply(425, "Can't open data connection."); 1961 (void) close(pdata); 1962 pdata = -1; 1963 return (NULL); 1964 } 1965 if (data >= 0) { 1966 reply(125, "Using existing data connection for '%s'%s.", 1967 name, sizebuf); 1968 usedefault = 1; 1969 return (fdopen(data, mode)); 1970 } 1971 if (usedefault) 1972 data_dest = his_addr; 1973 usedefault = 1; 1974 do { 1975 file = getdatasock(mode); 1976 if (file == NULL) { 1977 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1978 1979 if (getnameinfo((struct sockaddr *)&data_source, 1980 data_source.su_len, 1981 hostbuf, sizeof(hostbuf) - 1, 1982 portbuf, sizeof(portbuf) - 1, 1983 NI_NUMERICHOST|NI_NUMERICSERV)) 1984 *hostbuf = *portbuf = 0; 1985 hostbuf[sizeof(hostbuf) - 1] = 0; 1986 portbuf[sizeof(portbuf) - 1] = 0; 1987 reply(425, "Can't create data socket (%s,%s): %s.", 1988 hostbuf, portbuf, strerror(errno)); 1989 return (NULL); 1990 } 1991 data = fileno(file); 1992 conerrno = 0; 1993 if (connect(data, (struct sockaddr *)&data_dest, 1994 data_dest.su_len) == 0) 1995 break; 1996 conerrno = errno; 1997 (void) fclose(file); 1998 data = -1; 1999 if (conerrno == EADDRINUSE) { 2000 sleep(swaitint); 2001 retry += swaitint; 2002 } else { 2003 break; 2004 } 2005 } while (retry <= swaitmax); 2006 if (conerrno != 0) { 2007 reply(425, "Can't build data connection: %s.", 2008 strerror(conerrno)); 2009 return (NULL); 2010 } 2011 reply(150, "Opening %s mode data connection for '%s'%s.", 2012 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2013 return (file); 2014 } 2015 2016 /* 2017 * A helper macro to avoid code duplication 2018 * in send_data() and receive_data(). 2019 * 2020 * XXX We have to block SIGURG during putc() because BSD stdio 2021 * is unable to restart interrupted write operations and hence 2022 * the entire buffer contents will be lost as soon as a write() 2023 * call indicates EINTR to stdio. 2024 */ 2025 #define FTPD_PUTC(ch, file, label) \ 2026 do { \ 2027 int ret; \ 2028 \ 2029 do { \ 2030 START_UNSAFE; \ 2031 ret = putc((ch), (file)); \ 2032 END_UNSAFE; \ 2033 CHECKOOB(return (-1)) \ 2034 else if (ferror(file)) \ 2035 goto label; \ 2036 clearerr(file); \ 2037 } while (ret == EOF); \ 2038 } while (0) 2039 2040 /* 2041 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2042 * encapsulation of the data subject to Mode, Structure, and Type. 2043 * 2044 * NB: Form isn't handled. 2045 */ 2046 static int 2047 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2048 { 2049 int c, cp, filefd, netfd; 2050 char *buf; 2051 2052 STARTXFER; 2053 2054 switch (type) { 2055 2056 case TYPE_A: 2057 cp = EOF; 2058 for (;;) { 2059 c = getc(instr); 2060 CHECKOOB(return (-1)) 2061 else if (c == EOF && ferror(instr)) 2062 goto file_err; 2063 if (c == EOF) { 2064 if (ferror(instr)) { /* resume after OOB */ 2065 clearerr(instr); 2066 continue; 2067 } 2068 if (feof(instr)) /* EOF */ 2069 break; 2070 syslog(LOG_ERR, "Internal: impossible condition" 2071 " on file after getc()"); 2072 goto file_err; 2073 } 2074 if (c == '\n' && cp != '\r') { 2075 FTPD_PUTC('\r', outstr, data_err); 2076 byte_count++; 2077 } 2078 FTPD_PUTC(c, outstr, data_err); 2079 byte_count++; 2080 cp = c; 2081 } 2082 #ifdef notyet /* BSD stdio isn't ready for that */ 2083 while (fflush(outstr) == EOF) { 2084 CHECKOOB(return (-1)) 2085 else 2086 goto data_err; 2087 clearerr(outstr); 2088 } 2089 ENDXFER; 2090 #else 2091 ENDXFER; 2092 if (fflush(outstr) == EOF) 2093 goto data_err; 2094 #endif 2095 reply(226, "Transfer complete."); 2096 return (0); 2097 2098 case TYPE_I: 2099 case TYPE_L: 2100 /* 2101 * isreg is only set if we are not doing restart and we 2102 * are sending a regular file 2103 */ 2104 netfd = fileno(outstr); 2105 filefd = fileno(instr); 2106 2107 if (isreg) { 2108 char *msg = "Transfer complete."; 2109 off_t cnt, offset; 2110 int err; 2111 2112 cnt = offset = 0; 2113 2114 while (filesize > 0) { 2115 err = sendfile(filefd, netfd, offset, 0, 2116 NULL, &cnt, 0); 2117 /* 2118 * Calculate byte_count before OOB processing. 2119 * It can be used in myoob() later. 2120 */ 2121 byte_count += cnt; 2122 offset += cnt; 2123 filesize -= cnt; 2124 CHECKOOB(return (-1)) 2125 else if (err == -1) { 2126 if (errno != EINTR && 2127 cnt == 0 && offset == 0) 2128 goto oldway; 2129 goto data_err; 2130 } 2131 if (err == -1) /* resume after OOB */ 2132 continue; 2133 /* 2134 * We hit the EOF prematurely. 2135 * Perhaps the file was externally truncated. 2136 */ 2137 if (cnt == 0) { 2138 msg = "Transfer finished due to " 2139 "premature end of file."; 2140 break; 2141 } 2142 } 2143 ENDXFER; 2144 reply(226, "%s", msg); 2145 return (0); 2146 } 2147 2148 oldway: 2149 if ((buf = malloc(blksize)) == NULL) { 2150 ENDXFER; 2151 reply(451, "Ran out of memory."); 2152 return (-1); 2153 } 2154 2155 for (;;) { 2156 int cnt, len; 2157 char *bp; 2158 2159 cnt = read(filefd, buf, blksize); 2160 CHECKOOB(free(buf); return (-1)) 2161 else if (cnt < 0) { 2162 free(buf); 2163 goto file_err; 2164 } 2165 if (cnt < 0) /* resume after OOB */ 2166 continue; 2167 if (cnt == 0) /* EOF */ 2168 break; 2169 for (len = cnt, bp = buf; len > 0;) { 2170 cnt = write(netfd, bp, len); 2171 CHECKOOB(free(buf); return (-1)) 2172 else if (cnt < 0) { 2173 free(buf); 2174 goto data_err; 2175 } 2176 if (cnt <= 0) 2177 continue; 2178 len -= cnt; 2179 bp += cnt; 2180 byte_count += cnt; 2181 } 2182 } 2183 ENDXFER; 2184 free(buf); 2185 reply(226, "Transfer complete."); 2186 return (0); 2187 default: 2188 ENDXFER; 2189 reply(550, "Unimplemented TYPE %d in send_data.", type); 2190 return (-1); 2191 } 2192 2193 data_err: 2194 ENDXFER; 2195 perror_reply(426, "Data connection"); 2196 return (-1); 2197 2198 file_err: 2199 ENDXFER; 2200 perror_reply(551, "Error on input file"); 2201 return (-1); 2202 } 2203 2204 /* 2205 * Transfer data from peer to "outstr" using the appropriate encapulation of 2206 * the data subject to Mode, Structure, and Type. 2207 * 2208 * N.B.: Form isn't handled. 2209 */ 2210 static int 2211 receive_data(FILE *instr, FILE *outstr) 2212 { 2213 int c, cp; 2214 int bare_lfs = 0; 2215 2216 STARTXFER; 2217 2218 switch (type) { 2219 2220 case TYPE_I: 2221 case TYPE_L: 2222 for (;;) { 2223 int cnt, len; 2224 char *bp; 2225 char buf[BUFSIZ]; 2226 2227 cnt = read(fileno(instr), buf, sizeof(buf)); 2228 CHECKOOB(return (-1)) 2229 else if (cnt < 0) 2230 goto data_err; 2231 if (cnt < 0) /* resume after OOB */ 2232 continue; 2233 if (cnt == 0) /* EOF */ 2234 break; 2235 for (len = cnt, bp = buf; len > 0;) { 2236 cnt = write(fileno(outstr), bp, len); 2237 CHECKOOB(return (-1)) 2238 else if (cnt < 0) 2239 goto file_err; 2240 if (cnt <= 0) 2241 continue; 2242 len -= cnt; 2243 bp += cnt; 2244 byte_count += cnt; 2245 } 2246 } 2247 ENDXFER; 2248 return (0); 2249 2250 case TYPE_E: 2251 ENDXFER; 2252 reply(553, "TYPE E not implemented."); 2253 return (-1); 2254 2255 case TYPE_A: 2256 cp = EOF; 2257 for (;;) { 2258 c = getc(instr); 2259 CHECKOOB(return (-1)) 2260 else if (c == EOF && ferror(instr)) 2261 goto data_err; 2262 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2263 clearerr(instr); 2264 continue; 2265 } 2266 2267 if (cp == '\r') { 2268 if (c != '\n') 2269 FTPD_PUTC('\r', outstr, file_err); 2270 } else 2271 if (c == '\n') 2272 bare_lfs++; 2273 if (c == '\r') { 2274 byte_count++; 2275 cp = c; 2276 continue; 2277 } 2278 2279 /* Check for EOF here in order not to lose last \r. */ 2280 if (c == EOF) { 2281 if (feof(instr)) /* EOF */ 2282 break; 2283 syslog(LOG_ERR, "Internal: impossible condition" 2284 " on data stream after getc()"); 2285 goto data_err; 2286 } 2287 2288 byte_count++; 2289 FTPD_PUTC(c, outstr, file_err); 2290 cp = c; 2291 } 2292 #ifdef notyet /* BSD stdio isn't ready for that */ 2293 while (fflush(outstr) == EOF) { 2294 CHECKOOB(return (-1)) 2295 else 2296 goto file_err; 2297 clearerr(outstr); 2298 } 2299 ENDXFER; 2300 #else 2301 ENDXFER; 2302 if (fflush(outstr) == EOF) 2303 goto file_err; 2304 #endif 2305 if (bare_lfs) { 2306 lreply(226, 2307 "WARNING! %d bare linefeeds received in ASCII mode.", 2308 bare_lfs); 2309 (void)printf(" File may not have transferred correctly.\r\n"); 2310 } 2311 return (0); 2312 default: 2313 ENDXFER; 2314 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2315 return (-1); 2316 } 2317 2318 data_err: 2319 ENDXFER; 2320 perror_reply(426, "Data connection"); 2321 return (-1); 2322 2323 file_err: 2324 ENDXFER; 2325 perror_reply(452, "Error writing to file"); 2326 return (-1); 2327 } 2328 2329 void 2330 statfilecmd(char *filename) 2331 { 2332 FILE *fin; 2333 int atstart; 2334 int c, code; 2335 char line[LINE_MAX]; 2336 struct stat st; 2337 2338 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2339 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2340 fin = ftpd_popen(line, "r"); 2341 if (fin == NULL) { 2342 perror_reply(551, filename); 2343 return; 2344 } 2345 lreply(code, "Status of %s:", filename); 2346 atstart = 1; 2347 while ((c = getc(fin)) != EOF) { 2348 if (c == '\n') { 2349 if (ferror(stdout)){ 2350 perror_reply(421, "Control connection"); 2351 (void) ftpd_pclose(fin); 2352 dologout(1); 2353 /* NOTREACHED */ 2354 } 2355 if (ferror(fin)) { 2356 perror_reply(551, filename); 2357 (void) ftpd_pclose(fin); 2358 return; 2359 } 2360 (void) putc('\r', stdout); 2361 } 2362 /* 2363 * RFC 959 says neutral text should be prepended before 2364 * a leading 3-digit number followed by whitespace, but 2365 * many ftp clients can be confused by any leading digits, 2366 * as a matter of fact. 2367 */ 2368 if (atstart && isdigit(c)) 2369 (void) putc(' ', stdout); 2370 (void) putc(c, stdout); 2371 atstart = (c == '\n'); 2372 } 2373 (void) ftpd_pclose(fin); 2374 reply(code, "End of status."); 2375 } 2376 2377 void 2378 statcmd(void) 2379 { 2380 union sockunion *su; 2381 u_char *a, *p; 2382 char hname[NI_MAXHOST]; 2383 int ispassive; 2384 2385 if (hostinfo) { 2386 lreply(211, "%s FTP server status:", hostname); 2387 printf(" %s\r\n", version); 2388 } else 2389 lreply(211, "FTP server status:"); 2390 printf(" Connected to %s", remotehost); 2391 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2392 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2393 hname[sizeof(hname) - 1] = 0; 2394 if (strcmp(hname, remotehost) != 0) 2395 printf(" (%s)", hname); 2396 } 2397 printf("\r\n"); 2398 if (logged_in) { 2399 if (guest) 2400 printf(" Logged in anonymously\r\n"); 2401 else 2402 printf(" Logged in as %s\r\n", pw->pw_name); 2403 } else if (askpasswd) 2404 printf(" Waiting for password\r\n"); 2405 else 2406 printf(" Waiting for user name\r\n"); 2407 printf(" TYPE: %s", typenames[type]); 2408 if (type == TYPE_A || type == TYPE_E) 2409 printf(", FORM: %s", formnames[form]); 2410 if (type == TYPE_L) 2411 #if CHAR_BIT == 8 2412 printf(" %d", CHAR_BIT); 2413 #else 2414 printf(" %d", bytesize); /* need definition! */ 2415 #endif 2416 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2417 strunames[stru], modenames[mode]); 2418 if (data != -1) 2419 printf(" Data connection open\r\n"); 2420 else if (pdata != -1) { 2421 ispassive = 1; 2422 su = &pasv_addr; 2423 goto printaddr; 2424 } else if (usedefault == 0) { 2425 ispassive = 0; 2426 su = &data_dest; 2427 printaddr: 2428 #define UC(b) (((int) b) & 0xff) 2429 if (epsvall) { 2430 printf(" EPSV only mode (EPSV ALL)\r\n"); 2431 goto epsvonly; 2432 } 2433 2434 /* PORT/PASV */ 2435 if (su->su_family == AF_INET) { 2436 a = (u_char *) &su->su_sin.sin_addr; 2437 p = (u_char *) &su->su_sin.sin_port; 2438 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2439 ispassive ? "PASV" : "PORT", 2440 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2441 UC(p[0]), UC(p[1])); 2442 } 2443 2444 /* LPRT/LPSV */ 2445 { 2446 int alen, af, i; 2447 2448 switch (su->su_family) { 2449 case AF_INET: 2450 a = (u_char *) &su->su_sin.sin_addr; 2451 p = (u_char *) &su->su_sin.sin_port; 2452 alen = sizeof(su->su_sin.sin_addr); 2453 af = 4; 2454 break; 2455 case AF_INET6: 2456 a = (u_char *) &su->su_sin6.sin6_addr; 2457 p = (u_char *) &su->su_sin6.sin6_port; 2458 alen = sizeof(su->su_sin6.sin6_addr); 2459 af = 6; 2460 break; 2461 default: 2462 af = 0; 2463 break; 2464 } 2465 if (af) { 2466 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2467 af, alen); 2468 for (i = 0; i < alen; i++) 2469 printf("%d,", UC(a[i])); 2470 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2471 } 2472 } 2473 2474 epsvonly:; 2475 /* EPRT/EPSV */ 2476 { 2477 int af; 2478 2479 switch (su->su_family) { 2480 case AF_INET: 2481 af = 1; 2482 break; 2483 case AF_INET6: 2484 af = 2; 2485 break; 2486 default: 2487 af = 0; 2488 break; 2489 } 2490 if (af) { 2491 union sockunion tmp; 2492 2493 tmp = *su; 2494 if (tmp.su_family == AF_INET6) 2495 tmp.su_sin6.sin6_scope_id = 0; 2496 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2497 hname, sizeof(hname) - 1, NULL, 0, 2498 NI_NUMERICHOST)) { 2499 hname[sizeof(hname) - 1] = 0; 2500 printf(" %s |%d|%s|%d|\r\n", 2501 ispassive ? "EPSV" : "EPRT", 2502 af, hname, htons(tmp.su_port)); 2503 } 2504 } 2505 } 2506 #undef UC 2507 } else 2508 printf(" No data connection\r\n"); 2509 reply(211, "End of status."); 2510 } 2511 2512 void 2513 fatalerror(char *s) 2514 { 2515 2516 reply(451, "Error in server: %s", s); 2517 reply(221, "Closing connection due to server error."); 2518 dologout(0); 2519 /* NOTREACHED */ 2520 } 2521 2522 void 2523 reply(int n, const char *fmt, ...) 2524 { 2525 va_list ap; 2526 2527 (void)printf("%d ", n); 2528 va_start(ap, fmt); 2529 (void)vprintf(fmt, ap); 2530 va_end(ap); 2531 (void)printf("\r\n"); 2532 (void)fflush(stdout); 2533 if (ftpdebug) { 2534 syslog(LOG_DEBUG, "<--- %d ", n); 2535 va_start(ap, fmt); 2536 vsyslog(LOG_DEBUG, fmt, ap); 2537 va_end(ap); 2538 } 2539 } 2540 2541 void 2542 lreply(int n, const char *fmt, ...) 2543 { 2544 va_list ap; 2545 2546 (void)printf("%d- ", n); 2547 va_start(ap, fmt); 2548 (void)vprintf(fmt, ap); 2549 va_end(ap); 2550 (void)printf("\r\n"); 2551 (void)fflush(stdout); 2552 if (ftpdebug) { 2553 syslog(LOG_DEBUG, "<--- %d- ", n); 2554 va_start(ap, fmt); 2555 vsyslog(LOG_DEBUG, fmt, ap); 2556 va_end(ap); 2557 } 2558 } 2559 2560 static void 2561 ack(char *s) 2562 { 2563 2564 reply(250, "%s command successful.", s); 2565 } 2566 2567 void 2568 nack(char *s) 2569 { 2570 2571 reply(502, "%s command not implemented.", s); 2572 } 2573 2574 /* ARGSUSED */ 2575 void 2576 yyerror(char *s) 2577 { 2578 char *cp; 2579 2580 if ((cp = strchr(cbuf,'\n'))) 2581 *cp = '\0'; 2582 reply(500, "%s: command not understood.", cbuf); 2583 } 2584 2585 void 2586 delete(char *name) 2587 { 2588 struct stat st; 2589 2590 LOGCMD("delete", name); 2591 if (lstat(name, &st) < 0) { 2592 perror_reply(550, name); 2593 return; 2594 } 2595 if (S_ISDIR(st.st_mode)) { 2596 if (rmdir(name) < 0) { 2597 perror_reply(550, name); 2598 return; 2599 } 2600 goto done; 2601 } 2602 if (guest && noguestmod) { 2603 reply(550, "Operation not permitted."); 2604 return; 2605 } 2606 if (unlink(name) < 0) { 2607 perror_reply(550, name); 2608 return; 2609 } 2610 done: 2611 ack("DELE"); 2612 } 2613 2614 void 2615 cwd(char *path) 2616 { 2617 2618 if (chdir(path) < 0) 2619 perror_reply(550, path); 2620 else 2621 ack("CWD"); 2622 } 2623 2624 void 2625 makedir(char *name) 2626 { 2627 char *s; 2628 2629 LOGCMD("mkdir", name); 2630 if (guest && noguestmkd) 2631 reply(550, "Operation not permitted."); 2632 else if (mkdir(name, 0777) < 0) 2633 perror_reply(550, name); 2634 else { 2635 if ((s = doublequote(name)) == NULL) 2636 fatalerror("Ran out of memory."); 2637 reply(257, "\"%s\" directory created.", s); 2638 free(s); 2639 } 2640 } 2641 2642 void 2643 removedir(char *name) 2644 { 2645 2646 LOGCMD("rmdir", name); 2647 if (rmdir(name) < 0) 2648 perror_reply(550, name); 2649 else 2650 ack("RMD"); 2651 } 2652 2653 void 2654 pwd(void) 2655 { 2656 char *s, path[MAXPATHLEN + 1]; 2657 2658 if (getcwd(path, sizeof(path)) == NULL) 2659 perror_reply(550, "Get current directory"); 2660 else { 2661 if ((s = doublequote(path)) == NULL) 2662 fatalerror("Ran out of memory."); 2663 reply(257, "\"%s\" is current directory.", s); 2664 free(s); 2665 } 2666 } 2667 2668 char * 2669 renamefrom(char *name) 2670 { 2671 struct stat st; 2672 2673 if (guest && noguestmod) { 2674 reply(550, "Operation not permitted."); 2675 return (NULL); 2676 } 2677 if (lstat(name, &st) < 0) { 2678 perror_reply(550, name); 2679 return (NULL); 2680 } 2681 reply(350, "File exists, ready for destination name."); 2682 return (name); 2683 } 2684 2685 void 2686 renamecmd(char *from, char *to) 2687 { 2688 struct stat st; 2689 2690 LOGCMD2("rename", from, to); 2691 2692 if (guest && (stat(to, &st) == 0)) { 2693 reply(550, "%s: permission denied.", to); 2694 return; 2695 } 2696 2697 if (rename(from, to) < 0) 2698 perror_reply(550, "rename"); 2699 else 2700 ack("RNTO"); 2701 } 2702 2703 static void 2704 dolog(struct sockaddr *who) 2705 { 2706 char who_name[NI_MAXHOST]; 2707 2708 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2709 remotehost[sizeof(remotehost) - 1] = 0; 2710 if (getnameinfo(who, who->sa_len, 2711 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2712 *who_name = 0; 2713 who_name[sizeof(who_name) - 1] = 0; 2714 2715 #ifdef SETPROCTITLE 2716 #ifdef VIRTUAL_HOSTING 2717 if (thishost != firsthost) 2718 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2719 remotehost, hostname); 2720 else 2721 #endif 2722 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2723 remotehost); 2724 setproctitle("%s", proctitle); 2725 #endif /* SETPROCTITLE */ 2726 2727 if (logging) { 2728 #ifdef VIRTUAL_HOSTING 2729 if (thishost != firsthost) 2730 syslog(LOG_INFO, "connection from %s (%s) to %s", 2731 remotehost, who_name, hostname); 2732 else 2733 #endif 2734 syslog(LOG_INFO, "connection from %s (%s)", 2735 remotehost, who_name); 2736 } 2737 } 2738 2739 /* 2740 * Record logout in wtmp file 2741 * and exit with supplied status. 2742 */ 2743 void 2744 dologout(int status) 2745 { 2746 2747 if (logged_in && dowtmp) { 2748 (void) seteuid(0); 2749 #ifdef LOGIN_CAP 2750 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 2751 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 2752 LOGIN_SETENV)); 2753 #endif 2754 ftpd_logwtmp(wtmpid, NULL, NULL); 2755 } 2756 /* beware of flushing buffers after a SIGPIPE */ 2757 _exit(status); 2758 } 2759 2760 static void 2761 sigurg(int signo) 2762 { 2763 2764 recvurg = 1; 2765 } 2766 2767 static void 2768 maskurg(int flag) 2769 { 2770 int oerrno; 2771 sigset_t sset; 2772 2773 if (!transflag) { 2774 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2775 return; 2776 } 2777 oerrno = errno; 2778 sigemptyset(&sset); 2779 sigaddset(&sset, SIGURG); 2780 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2781 errno = oerrno; 2782 } 2783 2784 static void 2785 flagxfer(int flag) 2786 { 2787 2788 if (flag) { 2789 if (transflag) 2790 syslog(LOG_ERR, "Internal: flagxfer(1): " 2791 "transfer already under way"); 2792 transflag = 1; 2793 maskurg(0); 2794 recvurg = 0; 2795 } else { 2796 if (!transflag) 2797 syslog(LOG_ERR, "Internal: flagxfer(0): " 2798 "no active transfer"); 2799 maskurg(1); 2800 transflag = 0; 2801 } 2802 } 2803 2804 /* 2805 * Returns 0 if OK to resume or -1 if abort requested. 2806 */ 2807 static int 2808 myoob(void) 2809 { 2810 char *cp; 2811 int ret; 2812 2813 if (!transflag) { 2814 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2815 return (0); 2816 } 2817 cp = tmpline; 2818 ret = get_line(cp, 7, stdin); 2819 if (ret == -1) { 2820 reply(221, "You could at least say goodbye."); 2821 dologout(0); 2822 } else if (ret == -2) { 2823 /* Ignore truncated command. */ 2824 return (0); 2825 } 2826 upper(cp); 2827 if (strcmp(cp, "ABOR\r\n") == 0) { 2828 tmpline[0] = '\0'; 2829 reply(426, "Transfer aborted. Data connection closed."); 2830 reply(226, "Abort successful."); 2831 return (-1); 2832 } 2833 if (strcmp(cp, "STAT\r\n") == 0) { 2834 tmpline[0] = '\0'; 2835 if (file_size != -1) 2836 reply(213, "Status: %jd of %jd bytes transferred.", 2837 (intmax_t)byte_count, (intmax_t)file_size); 2838 else 2839 reply(213, "Status: %jd bytes transferred.", 2840 (intmax_t)byte_count); 2841 } 2842 return (0); 2843 } 2844 2845 /* 2846 * Note: a response of 425 is not mentioned as a possible response to 2847 * the PASV command in RFC959. However, it has been blessed as 2848 * a legitimate response by Jon Postel in a telephone conversation 2849 * with Rick Adams on 25 Jan 89. 2850 */ 2851 void 2852 passive(void) 2853 { 2854 socklen_t len; 2855 int on; 2856 char *p, *a; 2857 2858 if (pdata >= 0) /* close old port if one set */ 2859 close(pdata); 2860 2861 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2862 if (pdata < 0) { 2863 perror_reply(425, "Can't open passive connection"); 2864 return; 2865 } 2866 on = 1; 2867 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2868 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2869 2870 (void) seteuid(0); 2871 2872 #ifdef IP_PORTRANGE 2873 if (ctrl_addr.su_family == AF_INET) { 2874 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2875 : IP_PORTRANGE_DEFAULT; 2876 2877 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2878 &on, sizeof(on)) < 0) 2879 goto pasv_error; 2880 } 2881 #endif 2882 #ifdef IPV6_PORTRANGE 2883 if (ctrl_addr.su_family == AF_INET6) { 2884 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2885 : IPV6_PORTRANGE_DEFAULT; 2886 2887 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2888 &on, sizeof(on)) < 0) 2889 goto pasv_error; 2890 } 2891 #endif 2892 2893 pasv_addr = ctrl_addr; 2894 pasv_addr.su_port = 0; 2895 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2896 goto pasv_error; 2897 2898 (void) seteuid(pw->pw_uid); 2899 2900 len = sizeof(pasv_addr); 2901 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2902 goto pasv_error; 2903 if (listen(pdata, 1) < 0) 2904 goto pasv_error; 2905 if (pasv_addr.su_family == AF_INET) 2906 a = (char *) &pasv_addr.su_sin.sin_addr; 2907 else if (pasv_addr.su_family == AF_INET6 && 2908 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2909 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2910 else 2911 goto pasv_error; 2912 2913 p = (char *) &pasv_addr.su_port; 2914 2915 #define UC(b) (((int) b) & 0xff) 2916 2917 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2918 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2919 return; 2920 2921 pasv_error: 2922 (void) seteuid(pw->pw_uid); 2923 (void) close(pdata); 2924 pdata = -1; 2925 perror_reply(425, "Can't open passive connection"); 2926 return; 2927 } 2928 2929 /* 2930 * Long Passive defined in RFC 1639. 2931 * 228 Entering Long Passive Mode 2932 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2933 */ 2934 2935 void 2936 long_passive(char *cmd, int pf) 2937 { 2938 socklen_t len; 2939 int on; 2940 char *p, *a; 2941 2942 if (pdata >= 0) /* close old port if one set */ 2943 close(pdata); 2944 2945 if (pf != PF_UNSPEC) { 2946 if (ctrl_addr.su_family != pf) { 2947 switch (ctrl_addr.su_family) { 2948 case AF_INET: 2949 pf = 1; 2950 break; 2951 case AF_INET6: 2952 pf = 2; 2953 break; 2954 default: 2955 pf = 0; 2956 break; 2957 } 2958 /* 2959 * XXX 2960 * only EPRT/EPSV ready clients will understand this 2961 */ 2962 if (strcmp(cmd, "EPSV") == 0 && pf) { 2963 reply(522, "Network protocol mismatch, " 2964 "use (%d)", pf); 2965 } else 2966 reply(501, "Network protocol mismatch."); /*XXX*/ 2967 2968 return; 2969 } 2970 } 2971 2972 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2973 if (pdata < 0) { 2974 perror_reply(425, "Can't open passive connection"); 2975 return; 2976 } 2977 on = 1; 2978 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2979 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2980 2981 (void) seteuid(0); 2982 2983 pasv_addr = ctrl_addr; 2984 pasv_addr.su_port = 0; 2985 len = pasv_addr.su_len; 2986 2987 #ifdef IP_PORTRANGE 2988 if (ctrl_addr.su_family == AF_INET) { 2989 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2990 : IP_PORTRANGE_DEFAULT; 2991 2992 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2993 &on, sizeof(on)) < 0) 2994 goto pasv_error; 2995 } 2996 #endif 2997 #ifdef IPV6_PORTRANGE 2998 if (ctrl_addr.su_family == AF_INET6) { 2999 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 3000 : IPV6_PORTRANGE_DEFAULT; 3001 3002 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 3003 &on, sizeof(on)) < 0) 3004 goto pasv_error; 3005 } 3006 #endif 3007 3008 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 3009 goto pasv_error; 3010 3011 (void) seteuid(pw->pw_uid); 3012 3013 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 3014 goto pasv_error; 3015 if (listen(pdata, 1) < 0) 3016 goto pasv_error; 3017 3018 #define UC(b) (((int) b) & 0xff) 3019 3020 if (strcmp(cmd, "LPSV") == 0) { 3021 p = (char *)&pasv_addr.su_port; 3022 switch (pasv_addr.su_family) { 3023 case AF_INET: 3024 a = (char *) &pasv_addr.su_sin.sin_addr; 3025 v4_reply: 3026 reply(228, 3027 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3028 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3029 2, UC(p[0]), UC(p[1])); 3030 return; 3031 case AF_INET6: 3032 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3033 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3034 goto v4_reply; 3035 } 3036 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3037 reply(228, 3038 "Entering Long Passive Mode " 3039 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3040 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3041 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3042 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3043 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3044 2, UC(p[0]), UC(p[1])); 3045 return; 3046 } 3047 } else if (strcmp(cmd, "EPSV") == 0) { 3048 switch (pasv_addr.su_family) { 3049 case AF_INET: 3050 case AF_INET6: 3051 reply(229, "Entering Extended Passive Mode (|||%d|)", 3052 ntohs(pasv_addr.su_port)); 3053 return; 3054 } 3055 } else { 3056 /* more proper error code? */ 3057 } 3058 3059 pasv_error: 3060 (void) seteuid(pw->pw_uid); 3061 (void) close(pdata); 3062 pdata = -1; 3063 perror_reply(425, "Can't open passive connection"); 3064 return; 3065 } 3066 3067 /* 3068 * Generate unique name for file with basename "local" 3069 * and open the file in order to avoid possible races. 3070 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3071 * Return descriptor to the file, set "name" to its name. 3072 * 3073 * Generates failure reply on error. 3074 */ 3075 static int 3076 guniquefd(char *local, char **name) 3077 { 3078 static char new[MAXPATHLEN]; 3079 struct stat st; 3080 char *cp; 3081 int count; 3082 int fd; 3083 3084 cp = strrchr(local, '/'); 3085 if (cp) 3086 *cp = '\0'; 3087 if (stat(cp ? local : ".", &st) < 0) { 3088 perror_reply(553, cp ? local : "."); 3089 return (-1); 3090 } 3091 if (cp) { 3092 /* 3093 * Let not overwrite dirname with counter suffix. 3094 * -4 is for /nn\0 3095 * In this extreme case dot won't be put in front of suffix. 3096 */ 3097 if (strlen(local) > sizeof(new) - 4) { 3098 reply(553, "Pathname too long."); 3099 return (-1); 3100 } 3101 *cp = '/'; 3102 } 3103 /* -4 is for the .nn<null> we put on the end below */ 3104 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3105 cp = new + strlen(new); 3106 /* 3107 * Don't generate dotfile unless requested explicitly. 3108 * This covers the case when basename gets truncated off 3109 * by buffer size. 3110 */ 3111 if (cp > new && cp[-1] != '/') 3112 *cp++ = '.'; 3113 for (count = 0; count < 100; count++) { 3114 /* At count 0 try unmodified name */ 3115 if (count) 3116 (void)sprintf(cp, "%d", count); 3117 if ((fd = open(count ? new : local, 3118 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3119 *name = count ? new : local; 3120 return (fd); 3121 } 3122 if (errno != EEXIST) { 3123 perror_reply(553, count ? new : local); 3124 return (-1); 3125 } 3126 } 3127 reply(452, "Unique file name cannot be created."); 3128 return (-1); 3129 } 3130 3131 /* 3132 * Format and send reply containing system error number. 3133 */ 3134 void 3135 perror_reply(int code, char *string) 3136 { 3137 3138 reply(code, "%s: %s.", string, strerror(errno)); 3139 } 3140 3141 static char *onefile[] = { 3142 "", 3143 0 3144 }; 3145 3146 void 3147 send_file_list(char *whichf) 3148 { 3149 struct stat st; 3150 DIR *dirp = NULL; 3151 struct dirent *dir; 3152 FILE *dout = NULL; 3153 char **dirlist, *dirname; 3154 int simple = 0; 3155 int freeglob = 0; 3156 glob_t gl; 3157 3158 if (strpbrk(whichf, "~{[*?") != NULL) { 3159 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3160 3161 memset(&gl, 0, sizeof(gl)); 3162 gl.gl_matchc = MAXGLOBARGS; 3163 flags |= GLOB_LIMIT; 3164 freeglob = 1; 3165 if (glob(whichf, flags, 0, &gl)) { 3166 reply(550, "No matching files found."); 3167 goto out; 3168 } else if (gl.gl_pathc == 0) { 3169 errno = ENOENT; 3170 perror_reply(550, whichf); 3171 goto out; 3172 } 3173 dirlist = gl.gl_pathv; 3174 } else { 3175 onefile[0] = whichf; 3176 dirlist = onefile; 3177 simple = 1; 3178 } 3179 3180 while ((dirname = *dirlist++)) { 3181 if (stat(dirname, &st) < 0) { 3182 /* 3183 * If user typed "ls -l", etc, and the client 3184 * used NLST, do what the user meant. 3185 */ 3186 if (dirname[0] == '-' && *dirlist == NULL && 3187 dout == NULL) 3188 retrieve(_PATH_LS " %s", dirname); 3189 else 3190 perror_reply(550, whichf); 3191 goto out; 3192 } 3193 3194 if (S_ISREG(st.st_mode)) { 3195 if (dout == NULL) { 3196 dout = dataconn("file list", -1, "w"); 3197 if (dout == NULL) 3198 goto out; 3199 STARTXFER; 3200 } 3201 START_UNSAFE; 3202 fprintf(dout, "%s%s\n", dirname, 3203 type == TYPE_A ? "\r" : ""); 3204 END_UNSAFE; 3205 if (ferror(dout)) 3206 goto data_err; 3207 byte_count += strlen(dirname) + 3208 (type == TYPE_A ? 2 : 1); 3209 CHECKOOB(goto abrt); 3210 continue; 3211 } else if (!S_ISDIR(st.st_mode)) 3212 continue; 3213 3214 if ((dirp = opendir(dirname)) == NULL) 3215 continue; 3216 3217 while ((dir = readdir(dirp)) != NULL) { 3218 char nbuf[MAXPATHLEN]; 3219 3220 CHECKOOB(goto abrt); 3221 3222 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3223 continue; 3224 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3225 dir->d_namlen == 2) 3226 continue; 3227 3228 snprintf(nbuf, sizeof(nbuf), 3229 "%s/%s", dirname, dir->d_name); 3230 3231 /* 3232 * We have to do a stat to insure it's 3233 * not a directory or special file. 3234 */ 3235 if (simple || (stat(nbuf, &st) == 0 && 3236 S_ISREG(st.st_mode))) { 3237 if (dout == NULL) { 3238 dout = dataconn("file list", -1, "w"); 3239 if (dout == NULL) 3240 goto out; 3241 STARTXFER; 3242 } 3243 START_UNSAFE; 3244 if (nbuf[0] == '.' && nbuf[1] == '/') 3245 fprintf(dout, "%s%s\n", &nbuf[2], 3246 type == TYPE_A ? "\r" : ""); 3247 else 3248 fprintf(dout, "%s%s\n", nbuf, 3249 type == TYPE_A ? "\r" : ""); 3250 END_UNSAFE; 3251 if (ferror(dout)) 3252 goto data_err; 3253 byte_count += strlen(nbuf) + 3254 (type == TYPE_A ? 2 : 1); 3255 CHECKOOB(goto abrt); 3256 } 3257 } 3258 (void) closedir(dirp); 3259 dirp = NULL; 3260 } 3261 3262 if (dout == NULL) 3263 reply(550, "No files found."); 3264 else if (ferror(dout)) 3265 data_err: perror_reply(550, "Data connection"); 3266 else 3267 reply(226, "Transfer complete."); 3268 out: 3269 if (dout) { 3270 ENDXFER; 3271 abrt: 3272 (void) fclose(dout); 3273 data = -1; 3274 pdata = -1; 3275 } 3276 if (dirp) 3277 (void) closedir(dirp); 3278 if (freeglob) { 3279 freeglob = 0; 3280 globfree(&gl); 3281 } 3282 } 3283 3284 void 3285 reapchild(int signo) 3286 { 3287 while (waitpid(-1, NULL, WNOHANG) > 0); 3288 } 3289 3290 static void 3291 appendf(char **strp, char *fmt, ...) 3292 { 3293 va_list ap; 3294 char *ostr, *p; 3295 3296 va_start(ap, fmt); 3297 vasprintf(&p, fmt, ap); 3298 va_end(ap); 3299 if (p == NULL) 3300 fatalerror("Ran out of memory."); 3301 if (*strp == NULL) 3302 *strp = p; 3303 else { 3304 ostr = *strp; 3305 asprintf(strp, "%s%s", ostr, p); 3306 if (*strp == NULL) 3307 fatalerror("Ran out of memory."); 3308 free(ostr); 3309 } 3310 } 3311 3312 static void 3313 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3314 { 3315 char *msg = NULL; 3316 char wd[MAXPATHLEN + 1]; 3317 3318 if (logging <= 1) 3319 return; 3320 3321 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3322 strcpy(wd, strerror(errno)); 3323 3324 appendf(&msg, "%s", cmd); 3325 if (file1) 3326 appendf(&msg, " %s", file1); 3327 if (file2) 3328 appendf(&msg, " %s", file2); 3329 if (cnt >= 0) 3330 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3331 appendf(&msg, " (wd: %s", wd); 3332 if (guest || dochroot) 3333 appendf(&msg, "; chrooted"); 3334 appendf(&msg, ")"); 3335 syslog(LOG_INFO, "%s", msg); 3336 free(msg); 3337 } 3338 3339 static void 3340 logxfer(char *name, off_t size, time_t start) 3341 { 3342 char buf[MAXPATHLEN + 1024]; 3343 char path[MAXPATHLEN + 1]; 3344 time_t now; 3345 3346 if (statfd >= 0) { 3347 time(&now); 3348 if (realpath(name, path) == NULL) { 3349 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3350 return; 3351 } 3352 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3353 ctime(&now)+4, ident, remotehost, 3354 path, (intmax_t)size, 3355 (long)(now - start + (now == start))); 3356 write(statfd, buf, strlen(buf)); 3357 } 3358 } 3359 3360 static char * 3361 doublequote(char *s) 3362 { 3363 int n; 3364 char *p, *s2; 3365 3366 for (p = s, n = 0; *p; p++) 3367 if (*p == '"') 3368 n++; 3369 3370 if ((s2 = malloc(p - s + n + 1)) == NULL) 3371 return (NULL); 3372 3373 for (p = s2; *s; s++, p++) { 3374 if ((*p = *s) == '"') 3375 *(++p) = '"'; 3376 } 3377 *p = '\0'; 3378 3379 return (s2); 3380 } 3381 3382 /* setup server socket for specified address family */ 3383 /* if af is PF_UNSPEC more than one socket may be returned */ 3384 /* the returned list is dynamically allocated, so caller needs to free it */ 3385 static int * 3386 socksetup(int af, char *bindname, const char *bindport) 3387 { 3388 struct addrinfo hints, *res, *r; 3389 int error, maxs, *s, *socks; 3390 const int on = 1; 3391 3392 memset(&hints, 0, sizeof(hints)); 3393 hints.ai_flags = AI_PASSIVE; 3394 hints.ai_family = af; 3395 hints.ai_socktype = SOCK_STREAM; 3396 error = getaddrinfo(bindname, bindport, &hints, &res); 3397 if (error) { 3398 syslog(LOG_ERR, "%s", gai_strerror(error)); 3399 if (error == EAI_SYSTEM) 3400 syslog(LOG_ERR, "%s", strerror(errno)); 3401 return NULL; 3402 } 3403 3404 /* Count max number of sockets we may open */ 3405 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3406 ; 3407 socks = malloc((maxs + 1) * sizeof(int)); 3408 if (!socks) { 3409 freeaddrinfo(res); 3410 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3411 return NULL; 3412 } 3413 3414 *socks = 0; /* num of sockets counter at start of array */ 3415 s = socks + 1; 3416 for (r = res; r; r = r->ai_next) { 3417 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3418 if (*s < 0) { 3419 syslog(LOG_DEBUG, "control socket: %m"); 3420 continue; 3421 } 3422 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3423 &on, sizeof(on)) < 0) 3424 syslog(LOG_WARNING, 3425 "control setsockopt (SO_REUSEADDR): %m"); 3426 if (r->ai_family == AF_INET6) { 3427 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3428 &on, sizeof(on)) < 0) 3429 syslog(LOG_WARNING, 3430 "control setsockopt (IPV6_V6ONLY): %m"); 3431 } 3432 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3433 syslog(LOG_DEBUG, "control bind: %m"); 3434 close(*s); 3435 continue; 3436 } 3437 (*socks)++; 3438 s++; 3439 } 3440 3441 if (res) 3442 freeaddrinfo(res); 3443 3444 if (*socks == 0) { 3445 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3446 free(socks); 3447 return NULL; 3448 } 3449 return(socks); 3450 } 3451