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 __FBSDID("$FreeBSD$"); 48 49 /* 50 * FTP server. 51 */ 52 #include <sys/param.h> 53 #include <sys/ioctl.h> 54 #include <sys/mman.h> 55 #include <sys/socket.h> 56 #include <sys/stat.h> 57 #include <sys/time.h> 58 #include <sys/wait.h> 59 60 #include <netinet/in.h> 61 #include <netinet/in_systm.h> 62 #include <netinet/ip.h> 63 #include <netinet/tcp.h> 64 65 #define FTP_NAMES 66 #include <arpa/ftp.h> 67 #include <arpa/inet.h> 68 #include <arpa/telnet.h> 69 70 #include <ctype.h> 71 #include <dirent.h> 72 #include <err.h> 73 #include <errno.h> 74 #include <fcntl.h> 75 #include <glob.h> 76 #include <limits.h> 77 #include <netdb.h> 78 #include <pwd.h> 79 #include <grp.h> 80 #include <signal.h> 81 #include <stdint.h> 82 #include <stdio.h> 83 #include <stdlib.h> 84 #include <string.h> 85 #include <syslog.h> 86 #include <time.h> 87 #include <unistd.h> 88 #include <libutil.h> 89 #ifdef LOGIN_CAP 90 #include <login_cap.h> 91 #endif 92 93 #ifdef USE_PAM 94 #include <security/pam_appl.h> 95 #endif 96 97 #include "blacklist_client.h" 98 #include "pathnames.h" 99 #include "extern.h" 100 101 #include <stdarg.h> 102 103 static char version[] = "Version 6.00LS"; 104 #undef main 105 106 union sockunion ctrl_addr; 107 union sockunion data_source; 108 union sockunion data_dest; 109 union sockunion his_addr; 110 union sockunion pasv_addr; 111 112 int daemon_mode; 113 int data; 114 int dataport; 115 int hostinfo = 1; /* print host-specific info in messages */ 116 int logged_in; 117 struct passwd *pw; 118 char *homedir; 119 int ftpdebug; 120 int timeout = 900; /* timeout after 15 minutes of inactivity */ 121 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 122 int logging; 123 int restricted_data_ports = 1; 124 int paranoid = 1; /* be extra careful about security */ 125 int anon_only = 0; /* Only anonymous ftp allowed */ 126 int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 127 int guest; 128 int dochroot; 129 char *chrootdir; 130 int dowtmp = 1; 131 int stats; 132 int statfd = -1; 133 int type; 134 int form; 135 int stru; /* avoid C keyword */ 136 int mode; 137 int usedefault = 1; /* for data transfers */ 138 int pdata = -1; /* for passive mode */ 139 int readonly = 0; /* Server is in readonly mode. */ 140 int noepsv = 0; /* EPSV command is disabled. */ 141 int noretr = 0; /* RETR command is disabled. */ 142 int noguestretr = 0; /* RETR command is disabled for anon users. */ 143 int noguestmkd = 0; /* MKD command is disabled for anon users. */ 144 int noguestmod = 1; /* anon users may not modify existing files. */ 145 int use_blacklist = 0; 146 147 off_t file_size; 148 off_t byte_count; 149 #if !defined(CMASK) || CMASK == 0 150 #undef CMASK 151 #define CMASK 027 152 #endif 153 int defumask = CMASK; /* default umask value */ 154 char tmpline[7]; 155 char *hostname; 156 int epsvall = 0; 157 158 #ifdef VIRTUAL_HOSTING 159 char *ftpuser; 160 161 static struct ftphost { 162 struct ftphost *next; 163 struct addrinfo *hostinfo; 164 char *hostname; 165 char *anonuser; 166 char *statfile; 167 char *welcome; 168 char *loginmsg; 169 } *thishost, *firsthost; 170 171 #endif 172 char remotehost[NI_MAXHOST]; 173 char *ident = NULL; 174 175 static char wtmpid[20]; 176 177 #ifdef USE_PAM 178 static int auth_pam(struct passwd**, const char*); 179 pam_handle_t *pamh = NULL; 180 #endif 181 182 char *pid_file = NULL; /* means default location to pidfile(3) */ 183 184 /* 185 * Limit number of pathnames that glob can return. 186 * A limit of 0 indicates the number of pathnames is unlimited. 187 */ 188 #define MAXGLOBARGS 16384 189 # 190 191 /* 192 * Timeout intervals for retrying connections 193 * to hosts that don't accept PORT cmds. This 194 * is a kludge, but given the problems with TCP... 195 */ 196 #define SWAITMAX 90 /* wait at most 90 seconds */ 197 #define SWAITINT 5 /* interval between retries */ 198 199 int swaitmax = SWAITMAX; 200 int swaitint = SWAITINT; 201 202 #ifdef SETPROCTITLE 203 char proctitle[LINE_MAX]; /* initial part of title */ 204 #endif /* SETPROCTITLE */ 205 206 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 207 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 208 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 209 210 static volatile sig_atomic_t recvurg; 211 static int transflag; /* NB: for debugging only */ 212 213 #define STARTXFER flagxfer(1) 214 #define ENDXFER flagxfer(0) 215 216 #define START_UNSAFE maskurg(1) 217 #define END_UNSAFE maskurg(0) 218 219 /* It's OK to put an `else' clause after this macro. */ 220 #define CHECKOOB(action) \ 221 if (recvurg) { \ 222 recvurg = 0; \ 223 if (myoob()) { \ 224 ENDXFER; \ 225 action; \ 226 } \ 227 } 228 229 #ifdef VIRTUAL_HOSTING 230 static void inithosts(int); 231 static void selecthost(union sockunion *); 232 #endif 233 static void ack(char *); 234 static void sigurg(int); 235 static void maskurg(int); 236 static void flagxfer(int); 237 static int myoob(void); 238 static int checkuser(char *, char *, int, char **, int *); 239 static FILE *dataconn(char *, off_t, char *); 240 static void dolog(struct sockaddr *); 241 static void end_login(void); 242 static FILE *getdatasock(char *); 243 static int guniquefd(char *, char **); 244 static void lostconn(int); 245 static void sigquit(int); 246 static int receive_data(FILE *, FILE *); 247 static int send_data(FILE *, FILE *, size_t, off_t, int); 248 static struct passwd * 249 sgetpwnam(char *); 250 static char *sgetsave(char *); 251 static void reapchild(int); 252 static void appendf(char **, char *, ...) __printflike(2, 3); 253 static void logcmd(char *, char *, char *, off_t); 254 static void logxfer(char *, off_t, time_t); 255 static char *doublequote(char *); 256 static int *socksetup(int, char *, const char *); 257 258 int 259 main(int argc, char *argv[], char **envp) 260 { 261 socklen_t addrlen; 262 int ch, on = 1, tos, s = STDIN_FILENO; 263 char *cp, line[LINE_MAX]; 264 FILE *fd; 265 char *bindname = NULL; 266 const char *bindport = "ftp"; 267 int family = AF_UNSPEC; 268 struct sigaction sa; 269 270 tzset(); /* in case no timezone database in ~ftp */ 271 sigemptyset(&sa.sa_mask); 272 sa.sa_flags = SA_RESTART; 273 274 /* 275 * Prevent diagnostic messages from appearing on stderr. 276 * We run as a daemon or from inetd; in both cases, there's 277 * more reason in logging to syslog. 278 */ 279 (void) freopen(_PATH_DEVNULL, "w", stderr); 280 opterr = 0; 281 282 /* 283 * LOG_NDELAY sets up the logging connection immediately, 284 * necessary for anonymous ftp's that chroot and can't do it later. 285 */ 286 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 287 288 while ((ch = getopt(argc, argv, 289 "468a:ABdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 290 switch (ch) { 291 case '4': 292 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 293 break; 294 295 case '6': 296 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 297 break; 298 299 case '8': 300 assumeutf8 = 1; 301 break; 302 303 case 'a': 304 bindname = optarg; 305 break; 306 307 case 'A': 308 anon_only = 1; 309 break; 310 311 case 'B': 312 #ifdef USE_BLACKLIST 313 use_blacklist = 1; 314 #else 315 syslog(LOG_WARNING, "not compiled with USE_BLACKLIST support"); 316 #endif 317 break; 318 319 case 'd': 320 ftpdebug++; 321 break; 322 323 case 'D': 324 daemon_mode++; 325 break; 326 327 case 'E': 328 noepsv = 1; 329 break; 330 331 case 'h': 332 hostinfo = 0; 333 break; 334 335 case 'l': 336 logging++; /* > 1 == extra logging */ 337 break; 338 339 case 'm': 340 noguestmod = 0; 341 break; 342 343 case 'M': 344 noguestmkd = 1; 345 break; 346 347 case 'o': 348 noretr = 1; 349 break; 350 351 case 'O': 352 noguestretr = 1; 353 break; 354 355 case 'p': 356 pid_file = optarg; 357 break; 358 359 case 'P': 360 bindport = optarg; 361 break; 362 363 case 'r': 364 readonly = 1; 365 break; 366 367 case 'R': 368 paranoid = 0; 369 break; 370 371 case 'S': 372 stats++; 373 break; 374 375 case 't': 376 timeout = atoi(optarg); 377 if (maxtimeout < timeout) 378 maxtimeout = timeout; 379 break; 380 381 case 'T': 382 maxtimeout = atoi(optarg); 383 if (timeout > maxtimeout) 384 timeout = maxtimeout; 385 break; 386 387 case 'u': 388 { 389 long val = 0; 390 391 val = strtol(optarg, &optarg, 8); 392 if (*optarg != '\0' || val < 0) 393 syslog(LOG_WARNING, "bad value for -u"); 394 else 395 defumask = val; 396 break; 397 } 398 case 'U': 399 restricted_data_ports = 0; 400 break; 401 402 case 'v': 403 ftpdebug++; 404 break; 405 406 case 'W': 407 dowtmp = 0; 408 break; 409 410 default: 411 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 412 break; 413 } 414 } 415 416 /* handle filesize limit gracefully */ 417 sa.sa_handler = SIG_IGN; 418 (void)sigaction(SIGXFSZ, &sa, NULL); 419 420 if (daemon_mode) { 421 int *ctl_sock, fd, maxfd = -1, nfds, i; 422 fd_set defreadfds, readfds; 423 pid_t pid; 424 struct pidfh *pfh; 425 426 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) { 427 if (errno == EEXIST) { 428 syslog(LOG_ERR, "%s already running, pid %d", 429 getprogname(), (int)pid); 430 exit(1); 431 } 432 syslog(LOG_WARNING, "pidfile_open: %m"); 433 } 434 435 /* 436 * Detach from parent. 437 */ 438 if (daemon(1, 1) < 0) { 439 syslog(LOG_ERR, "failed to become a daemon"); 440 exit(1); 441 } 442 443 if (pfh != NULL && pidfile_write(pfh) == -1) 444 syslog(LOG_WARNING, "pidfile_write: %m"); 445 446 sa.sa_handler = reapchild; 447 (void)sigaction(SIGCHLD, &sa, NULL); 448 449 #ifdef VIRTUAL_HOSTING 450 inithosts(family); 451 #endif 452 453 /* 454 * Open a socket, bind it to the FTP port, and start 455 * listening. 456 */ 457 ctl_sock = socksetup(family, bindname, bindport); 458 if (ctl_sock == NULL) 459 exit(1); 460 461 FD_ZERO(&defreadfds); 462 for (i = 1; i <= *ctl_sock; i++) { 463 FD_SET(ctl_sock[i], &defreadfds); 464 if (listen(ctl_sock[i], 32) < 0) { 465 syslog(LOG_ERR, "control listen: %m"); 466 exit(1); 467 } 468 if (maxfd < ctl_sock[i]) 469 maxfd = ctl_sock[i]; 470 } 471 472 /* 473 * Loop forever accepting connection requests and forking off 474 * children to handle them. 475 */ 476 while (1) { 477 FD_COPY(&defreadfds, &readfds); 478 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 479 if (nfds <= 0) { 480 if (nfds < 0 && errno != EINTR) 481 syslog(LOG_WARNING, "select: %m"); 482 continue; 483 } 484 485 pid = -1; 486 for (i = 1; i <= *ctl_sock; i++) 487 if (FD_ISSET(ctl_sock[i], &readfds)) { 488 addrlen = sizeof(his_addr); 489 fd = accept(ctl_sock[i], 490 (struct sockaddr *)&his_addr, 491 &addrlen); 492 if (fd == -1) { 493 syslog(LOG_WARNING, 494 "accept: %m"); 495 continue; 496 } 497 switch (pid = fork()) { 498 case 0: 499 /* child */ 500 (void) dup2(fd, s); 501 (void) dup2(fd, STDOUT_FILENO); 502 (void) close(fd); 503 for (i = 1; i <= *ctl_sock; i++) 504 close(ctl_sock[i]); 505 if (pfh != NULL) 506 pidfile_close(pfh); 507 goto gotchild; 508 case -1: 509 syslog(LOG_WARNING, "fork: %m"); 510 /* FALLTHROUGH */ 511 default: 512 close(fd); 513 } 514 } 515 } 516 } else { 517 addrlen = sizeof(his_addr); 518 if (getpeername(s, (struct sockaddr *)&his_addr, &addrlen) < 0) { 519 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 520 exit(1); 521 } 522 523 #ifdef VIRTUAL_HOSTING 524 if (his_addr.su_family == AF_INET6 && 525 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 526 family = AF_INET; 527 else 528 family = his_addr.su_family; 529 inithosts(family); 530 #endif 531 } 532 533 gotchild: 534 sa.sa_handler = SIG_DFL; 535 (void)sigaction(SIGCHLD, &sa, NULL); 536 537 sa.sa_handler = sigurg; 538 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 539 (void)sigaction(SIGURG, &sa, NULL); 540 541 sigfillset(&sa.sa_mask); /* block all signals in handler */ 542 sa.sa_flags = SA_RESTART; 543 sa.sa_handler = sigquit; 544 (void)sigaction(SIGHUP, &sa, NULL); 545 (void)sigaction(SIGINT, &sa, NULL); 546 (void)sigaction(SIGQUIT, &sa, NULL); 547 (void)sigaction(SIGTERM, &sa, NULL); 548 549 sa.sa_handler = lostconn; 550 (void)sigaction(SIGPIPE, &sa, NULL); 551 552 addrlen = sizeof(ctrl_addr); 553 if (getsockname(s, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 554 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 555 exit(1); 556 } 557 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 558 #ifdef VIRTUAL_HOSTING 559 /* select our identity from virtual host table */ 560 selecthost(&ctrl_addr); 561 #endif 562 #ifdef IP_TOS 563 if (ctrl_addr.su_family == AF_INET) 564 { 565 tos = IPTOS_LOWDELAY; 566 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 567 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 568 } 569 #endif 570 /* 571 * Disable Nagle on the control channel so that we don't have to wait 572 * for peer's ACK before issuing our next reply. 573 */ 574 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 575 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 576 577 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 578 579 (void)snprintf(wtmpid, sizeof(wtmpid), "%xftpd", getpid()); 580 581 /* Try to handle urgent data inline */ 582 #ifdef SO_OOBINLINE 583 if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 584 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 585 #endif 586 587 #ifdef F_SETOWN 588 if (fcntl(s, F_SETOWN, getpid()) == -1) 589 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 590 #endif 591 dolog((struct sockaddr *)&his_addr); 592 /* 593 * Set up default state 594 */ 595 data = -1; 596 type = TYPE_A; 597 form = FORM_N; 598 stru = STRU_F; 599 mode = MODE_S; 600 tmpline[0] = '\0'; 601 602 /* If logins are disabled, print out the message. */ 603 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 604 while (fgets(line, sizeof(line), fd) != NULL) { 605 if ((cp = strchr(line, '\n')) != NULL) 606 *cp = '\0'; 607 lreply(530, "%s", line); 608 } 609 (void) fflush(stdout); 610 (void) fclose(fd); 611 reply(530, "System not available."); 612 exit(0); 613 } 614 #ifdef VIRTUAL_HOSTING 615 fd = fopen(thishost->welcome, "r"); 616 #else 617 fd = fopen(_PATH_FTPWELCOME, "r"); 618 #endif 619 if (fd != NULL) { 620 while (fgets(line, sizeof(line), fd) != NULL) { 621 if ((cp = strchr(line, '\n')) != NULL) 622 *cp = '\0'; 623 lreply(220, "%s", line); 624 } 625 (void) fflush(stdout); 626 (void) fclose(fd); 627 /* reply(220,) must follow */ 628 } 629 #ifndef VIRTUAL_HOSTING 630 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 631 fatalerror("Ran out of memory."); 632 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 633 hostname[0] = '\0'; 634 hostname[MAXHOSTNAMELEN - 1] = '\0'; 635 #endif 636 if (hostinfo) 637 reply(220, "%s FTP server (%s) ready.", hostname, version); 638 else 639 reply(220, "FTP server ready."); 640 BLACKLIST_INIT(); 641 for (;;) 642 (void) yyparse(); 643 /* NOTREACHED */ 644 } 645 646 static void 647 lostconn(int signo) 648 { 649 650 if (ftpdebug) 651 syslog(LOG_DEBUG, "lost connection"); 652 dologout(1); 653 } 654 655 static void 656 sigquit(int signo) 657 { 658 659 syslog(LOG_ERR, "got signal %d", signo); 660 dologout(1); 661 } 662 663 #ifdef VIRTUAL_HOSTING 664 /* 665 * read in virtual host tables (if they exist) 666 */ 667 668 static void 669 inithosts(int family) 670 { 671 int insert; 672 size_t len; 673 FILE *fp; 674 char *cp, *mp, *line; 675 char *hostname; 676 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 677 struct ftphost *hrp, *lhrp; 678 struct addrinfo hints, *res, *ai; 679 680 /* 681 * Fill in the default host information 682 */ 683 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 684 fatalerror("Ran out of memory."); 685 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 686 hostname[0] = '\0'; 687 hostname[MAXHOSTNAMELEN - 1] = '\0'; 688 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 689 fatalerror("Ran out of memory."); 690 hrp->hostname = hostname; 691 hrp->hostinfo = NULL; 692 693 memset(&hints, 0, sizeof(hints)); 694 hints.ai_flags = AI_PASSIVE; 695 hints.ai_family = family; 696 hints.ai_socktype = SOCK_STREAM; 697 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 698 hrp->hostinfo = res; 699 hrp->statfile = _PATH_FTPDSTATFILE; 700 hrp->welcome = _PATH_FTPWELCOME; 701 hrp->loginmsg = _PATH_FTPLOGINMESG; 702 hrp->anonuser = "ftp"; 703 hrp->next = NULL; 704 thishost = firsthost = lhrp = hrp; 705 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 706 int addrsize, gothost; 707 void *addr; 708 struct hostent *hp; 709 710 while ((line = fgetln(fp, &len)) != NULL) { 711 int i, hp_error; 712 713 /* skip comments */ 714 if (line[0] == '#') 715 continue; 716 if (line[len - 1] == '\n') { 717 line[len - 1] = '\0'; 718 mp = NULL; 719 } else { 720 if ((mp = malloc(len + 1)) == NULL) 721 fatalerror("Ran out of memory."); 722 memcpy(mp, line, len); 723 mp[len] = '\0'; 724 line = mp; 725 } 726 cp = strtok(line, " \t"); 727 /* skip empty lines */ 728 if (cp == NULL) 729 goto nextline; 730 vhost = cp; 731 732 /* set defaults */ 733 anonuser = "ftp"; 734 statfile = _PATH_FTPDSTATFILE; 735 welcome = _PATH_FTPWELCOME; 736 loginmsg = _PATH_FTPLOGINMESG; 737 738 /* 739 * Preparse the line so we can use its info 740 * for all the addresses associated with 741 * the virtual host name. 742 * Field 0, the virtual host name, is special: 743 * it's already parsed off and will be strdup'ed 744 * later, after we know its canonical form. 745 */ 746 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 747 if (*cp != '-' && (cp = strdup(cp))) 748 switch (i) { 749 case 1: /* anon user permissions */ 750 anonuser = cp; 751 break; 752 case 2: /* statistics file */ 753 statfile = cp; 754 break; 755 case 3: /* welcome message */ 756 welcome = cp; 757 break; 758 case 4: /* login message */ 759 loginmsg = cp; 760 break; 761 default: /* programming error */ 762 abort(); 763 /* NOTREACHED */ 764 } 765 766 hints.ai_flags = AI_PASSIVE; 767 hints.ai_family = family; 768 hints.ai_socktype = SOCK_STREAM; 769 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 770 goto nextline; 771 for (ai = res; ai != NULL && ai->ai_addr != NULL; 772 ai = ai->ai_next) { 773 774 gothost = 0; 775 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 776 struct addrinfo *hi; 777 778 for (hi = hrp->hostinfo; hi != NULL; 779 hi = hi->ai_next) 780 if (hi->ai_addrlen == ai->ai_addrlen && 781 memcmp(hi->ai_addr, 782 ai->ai_addr, 783 ai->ai_addr->sa_len) == 0) { 784 gothost++; 785 break; 786 } 787 if (gothost) 788 break; 789 } 790 if (hrp == NULL) { 791 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 792 goto nextline; 793 hrp->hostname = NULL; 794 insert = 1; 795 } else { 796 if (hrp->hostinfo && hrp->hostinfo != res) 797 freeaddrinfo(hrp->hostinfo); 798 insert = 0; /* host already in the chain */ 799 } 800 hrp->hostinfo = res; 801 802 /* 803 * determine hostname to use. 804 * force defined name if there is a valid alias 805 * otherwise fallback to primary hostname 806 */ 807 /* XXX: getaddrinfo() can't do alias check */ 808 switch(hrp->hostinfo->ai_family) { 809 case AF_INET: 810 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 811 addrsize = sizeof(struct in_addr); 812 break; 813 case AF_INET6: 814 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 815 addrsize = sizeof(struct in6_addr); 816 break; 817 default: 818 /* should not reach here */ 819 freeaddrinfo(hrp->hostinfo); 820 if (insert) 821 free(hrp); /*not in chain, can free*/ 822 else 823 hrp->hostinfo = NULL; /*mark as blank*/ 824 goto nextline; 825 /* NOTREACHED */ 826 } 827 if ((hp = getipnodebyaddr(addr, addrsize, 828 hrp->hostinfo->ai_family, 829 &hp_error)) != NULL) { 830 if (strcmp(vhost, hp->h_name) != 0) { 831 if (hp->h_aliases == NULL) 832 vhost = hp->h_name; 833 else { 834 i = 0; 835 while (hp->h_aliases[i] && 836 strcmp(vhost, hp->h_aliases[i]) != 0) 837 ++i; 838 if (hp->h_aliases[i] == NULL) 839 vhost = hp->h_name; 840 } 841 } 842 } 843 if (hrp->hostname && 844 strcmp(hrp->hostname, vhost) != 0) { 845 free(hrp->hostname); 846 hrp->hostname = NULL; 847 } 848 if (hrp->hostname == NULL && 849 (hrp->hostname = strdup(vhost)) == NULL) { 850 freeaddrinfo(hrp->hostinfo); 851 hrp->hostinfo = NULL; /* mark as blank */ 852 if (hp) 853 freehostent(hp); 854 goto nextline; 855 } 856 hrp->anonuser = anonuser; 857 hrp->statfile = statfile; 858 hrp->welcome = welcome; 859 hrp->loginmsg = loginmsg; 860 if (insert) { 861 hrp->next = NULL; 862 lhrp->next = hrp; 863 lhrp = hrp; 864 } 865 if (hp) 866 freehostent(hp); 867 } 868 nextline: 869 if (mp) 870 free(mp); 871 } 872 (void) fclose(fp); 873 } 874 } 875 876 static void 877 selecthost(union sockunion *su) 878 { 879 struct ftphost *hrp; 880 u_int16_t port; 881 #ifdef INET6 882 struct in6_addr *mapped_in6 = NULL; 883 #endif 884 struct addrinfo *hi; 885 886 #ifdef INET6 887 /* 888 * XXX IPv4 mapped IPv6 addr consideraton, 889 * specified in rfc2373. 890 */ 891 if (su->su_family == AF_INET6 && 892 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 893 mapped_in6 = &su->su_sin6.sin6_addr; 894 #endif 895 896 hrp = thishost = firsthost; /* default */ 897 port = su->su_port; 898 su->su_port = 0; 899 while (hrp != NULL) { 900 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 901 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 902 thishost = hrp; 903 goto found; 904 } 905 #ifdef INET6 906 /* XXX IPv4 mapped IPv6 addr consideraton */ 907 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 908 (memcmp(&mapped_in6->s6_addr[12], 909 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 910 sizeof(struct in_addr)) == 0)) { 911 thishost = hrp; 912 goto found; 913 } 914 #endif 915 } 916 hrp = hrp->next; 917 } 918 found: 919 su->su_port = port; 920 /* setup static variables as appropriate */ 921 hostname = thishost->hostname; 922 ftpuser = thishost->anonuser; 923 } 924 #endif 925 926 /* 927 * Helper function for sgetpwnam(). 928 */ 929 static char * 930 sgetsave(char *s) 931 { 932 char *new = malloc(strlen(s) + 1); 933 934 if (new == NULL) { 935 reply(421, "Ran out of memory."); 936 dologout(1); 937 /* NOTREACHED */ 938 } 939 (void) strcpy(new, s); 940 return (new); 941 } 942 943 /* 944 * Save the result of a getpwnam. Used for USER command, since 945 * the data returned must not be clobbered by any other command 946 * (e.g., globbing). 947 * NB: The data returned by sgetpwnam() will remain valid until 948 * the next call to this function. Its difference from getpwnam() 949 * is that sgetpwnam() is known to be called from ftpd code only. 950 */ 951 static struct passwd * 952 sgetpwnam(char *name) 953 { 954 static struct passwd save; 955 struct passwd *p; 956 957 if ((p = getpwnam(name)) == NULL) 958 return (p); 959 if (save.pw_name) { 960 free(save.pw_name); 961 free(save.pw_passwd); 962 free(save.pw_class); 963 free(save.pw_gecos); 964 free(save.pw_dir); 965 free(save.pw_shell); 966 } 967 save = *p; 968 save.pw_name = sgetsave(p->pw_name); 969 save.pw_passwd = sgetsave(p->pw_passwd); 970 save.pw_class = sgetsave(p->pw_class); 971 save.pw_gecos = sgetsave(p->pw_gecos); 972 save.pw_dir = sgetsave(p->pw_dir); 973 save.pw_shell = sgetsave(p->pw_shell); 974 return (&save); 975 } 976 977 static int login_attempts; /* number of failed login attempts */ 978 static int askpasswd; /* had user command, ask for passwd */ 979 static char curname[MAXLOGNAME]; /* current USER name */ 980 981 /* 982 * USER command. 983 * Sets global passwd pointer pw if named account exists and is acceptable; 984 * sets askpasswd if a PASS command is expected. If logged in previously, 985 * need to reset state. If name is "ftp" or "anonymous", the name is not in 986 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 987 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 988 * requesting login privileges. Disallow anyone who does not have a standard 989 * shell as returned by getusershell(). Disallow anyone mentioned in the file 990 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 991 */ 992 void 993 user(char *name) 994 { 995 int ecode; 996 char *cp, *shell; 997 998 if (logged_in) { 999 if (guest) { 1000 reply(530, "Can't change user from guest login."); 1001 return; 1002 } else if (dochroot) { 1003 reply(530, "Can't change user from chroot user."); 1004 return; 1005 } 1006 end_login(); 1007 } 1008 1009 guest = 0; 1010 #ifdef VIRTUAL_HOSTING 1011 pw = sgetpwnam(thishost->anonuser); 1012 #else 1013 pw = sgetpwnam("ftp"); 1014 #endif 1015 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1016 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL, &ecode) || 1017 (ecode != 0 && ecode != ENOENT)) 1018 reply(530, "User %s access denied.", name); 1019 else if (checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL, &ecode) || 1020 (ecode != 0 && ecode != ENOENT)) 1021 reply(530, "User %s access denied.", name); 1022 else if (pw != NULL) { 1023 guest = 1; 1024 askpasswd = 1; 1025 reply(331, 1026 "Guest login ok, send your email address as password."); 1027 } else 1028 reply(530, "User %s unknown.", name); 1029 if (!askpasswd && logging) 1030 syslog(LOG_NOTICE, 1031 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1032 return; 1033 } 1034 if (anon_only != 0) { 1035 reply(530, "Sorry, only anonymous ftp allowed."); 1036 return; 1037 } 1038 1039 if ((pw = sgetpwnam(name))) { 1040 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1041 shell = _PATH_BSHELL; 1042 setusershell(); 1043 while ((cp = getusershell()) != NULL) 1044 if (strcmp(cp, shell) == 0) 1045 break; 1046 endusershell(); 1047 1048 if (cp == NULL || 1049 (checkuser(_PATH_FTPUSERS, name, 1, NULL, &ecode) || 1050 (ecode != 0 && ecode != ENOENT))) { 1051 reply(530, "User %s access denied.", name); 1052 if (logging) 1053 syslog(LOG_NOTICE, 1054 "FTP LOGIN REFUSED FROM %s, %s", 1055 remotehost, name); 1056 pw = NULL; 1057 return; 1058 } 1059 } 1060 if (logging) 1061 strlcpy(curname, name, sizeof(curname)); 1062 1063 reply(331, "Password required for %s.", name); 1064 askpasswd = 1; 1065 /* 1066 * Delay before reading passwd after first failed 1067 * attempt to slow down passwd-guessing programs. 1068 */ 1069 if (login_attempts) 1070 sleep(login_attempts); 1071 } 1072 1073 /* 1074 * Check if a user is in the file "fname", 1075 * return a pointer to a malloc'd string with the rest 1076 * of the matching line in "residue" if not NULL. 1077 */ 1078 static int 1079 checkuser(char *fname, char *name, int pwset, char **residue, int *ecode) 1080 { 1081 FILE *fd; 1082 int found = 0; 1083 size_t len; 1084 char *line, *mp, *p; 1085 1086 if (ecode != NULL) 1087 *ecode = 0; 1088 if ((fd = fopen(fname, "r")) != NULL) { 1089 while (!found && (line = fgetln(fd, &len)) != NULL) { 1090 /* skip comments */ 1091 if (line[0] == '#') 1092 continue; 1093 if (line[len - 1] == '\n') { 1094 line[len - 1] = '\0'; 1095 mp = NULL; 1096 } else { 1097 if ((mp = malloc(len + 1)) == NULL) 1098 fatalerror("Ran out of memory."); 1099 memcpy(mp, line, len); 1100 mp[len] = '\0'; 1101 line = mp; 1102 } 1103 /* avoid possible leading and trailing whitespace */ 1104 p = strtok(line, " \t"); 1105 /* skip empty lines */ 1106 if (p == NULL) 1107 goto nextline; 1108 /* 1109 * if first chr is '@', check group membership 1110 */ 1111 if (p[0] == '@') { 1112 int i = 0; 1113 struct group *grp; 1114 1115 if (p[1] == '\0') /* single @ matches anyone */ 1116 found = 1; 1117 else { 1118 if ((grp = getgrnam(p+1)) == NULL) 1119 goto nextline; 1120 /* 1121 * Check user's default group 1122 */ 1123 if (pwset && grp->gr_gid == pw->pw_gid) 1124 found = 1; 1125 /* 1126 * Check supplementary groups 1127 */ 1128 while (!found && grp->gr_mem[i]) 1129 found = strcmp(name, 1130 grp->gr_mem[i++]) 1131 == 0; 1132 } 1133 } 1134 /* 1135 * Otherwise, just check for username match 1136 */ 1137 else 1138 found = strcmp(p, name) == 0; 1139 /* 1140 * Save the rest of line to "residue" if matched 1141 */ 1142 if (found && residue) { 1143 if ((p = strtok(NULL, "")) != NULL) 1144 p += strspn(p, " \t"); 1145 if (p && *p) { 1146 if ((*residue = strdup(p)) == NULL) 1147 fatalerror("Ran out of memory."); 1148 } else 1149 *residue = NULL; 1150 } 1151 nextline: 1152 if (mp) 1153 free(mp); 1154 } 1155 (void) fclose(fd); 1156 } else if (ecode != NULL) 1157 *ecode = errno; 1158 return (found); 1159 } 1160 1161 /* 1162 * Terminate login as previous user, if any, resetting state; 1163 * used when USER command is given or login fails. 1164 */ 1165 static void 1166 end_login(void) 1167 { 1168 #ifdef USE_PAM 1169 int e; 1170 #endif 1171 1172 (void) seteuid(0); 1173 #ifdef LOGIN_CAP 1174 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 1175 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 1176 LOGIN_SETENV)); 1177 #endif 1178 if (logged_in && dowtmp) 1179 ftpd_logwtmp(wtmpid, NULL, NULL); 1180 pw = NULL; 1181 #ifdef USE_PAM 1182 if (pamh) { 1183 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1184 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1185 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1186 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1187 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1188 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1189 pamh = NULL; 1190 } 1191 #endif 1192 logged_in = 0; 1193 guest = 0; 1194 dochroot = 0; 1195 } 1196 1197 #ifdef USE_PAM 1198 1199 /* 1200 * the following code is stolen from imap-uw PAM authentication module and 1201 * login.c 1202 */ 1203 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1204 1205 struct cred_t { 1206 const char *uname; /* user name */ 1207 const char *pass; /* password */ 1208 }; 1209 typedef struct cred_t cred_t; 1210 1211 static int 1212 auth_conv(int num_msg, const struct pam_message **msg, 1213 struct pam_response **resp, void *appdata) 1214 { 1215 int i; 1216 cred_t *cred = (cred_t *) appdata; 1217 struct pam_response *reply; 1218 1219 reply = calloc(num_msg, sizeof *reply); 1220 if (reply == NULL) 1221 return PAM_BUF_ERR; 1222 1223 for (i = 0; i < num_msg; i++) { 1224 switch (msg[i]->msg_style) { 1225 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1226 reply[i].resp_retcode = PAM_SUCCESS; 1227 reply[i].resp = COPY_STRING(cred->uname); 1228 /* PAM frees resp. */ 1229 break; 1230 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1231 reply[i].resp_retcode = PAM_SUCCESS; 1232 reply[i].resp = COPY_STRING(cred->pass); 1233 /* PAM frees resp. */ 1234 break; 1235 case PAM_TEXT_INFO: 1236 case PAM_ERROR_MSG: 1237 reply[i].resp_retcode = PAM_SUCCESS; 1238 reply[i].resp = NULL; 1239 break; 1240 default: /* unknown message style */ 1241 free(reply); 1242 return PAM_CONV_ERR; 1243 } 1244 } 1245 1246 *resp = reply; 1247 return PAM_SUCCESS; 1248 } 1249 1250 /* 1251 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1252 * authenticated, or 1 if not authenticated. If some sort of PAM system 1253 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1254 * function returns -1. This can be used as an indication that we should 1255 * fall back to a different authentication mechanism. 1256 */ 1257 static int 1258 auth_pam(struct passwd **ppw, const char *pass) 1259 { 1260 const char *tmpl_user; 1261 const void *item; 1262 int rval; 1263 int e; 1264 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1265 struct pam_conv conv = { &auth_conv, &auth_cred }; 1266 1267 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1268 if (e != PAM_SUCCESS) { 1269 /* 1270 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1271 * if context creation has failed in the first place. 1272 */ 1273 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1274 return -1; 1275 } 1276 1277 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1278 if (e != PAM_SUCCESS) { 1279 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1280 pam_strerror(pamh, e)); 1281 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1282 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1283 } 1284 pamh = NULL; 1285 return -1; 1286 } 1287 1288 e = pam_authenticate(pamh, 0); 1289 switch (e) { 1290 case PAM_SUCCESS: 1291 /* 1292 * With PAM we support the concept of a "template" 1293 * user. The user enters a login name which is 1294 * authenticated by PAM, usually via a remote service 1295 * such as RADIUS or TACACS+. If authentication 1296 * succeeds, a different but related "template" name 1297 * is used for setting the credentials, shell, and 1298 * home directory. The name the user enters need only 1299 * exist on the remote authentication server, but the 1300 * template name must be present in the local password 1301 * database. 1302 * 1303 * This is supported by two various mechanisms in the 1304 * individual modules. However, from the application's 1305 * point of view, the template user is always passed 1306 * back as a changed value of the PAM_USER item. 1307 */ 1308 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1309 PAM_SUCCESS) { 1310 tmpl_user = (const char *) item; 1311 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1312 *ppw = getpwnam(tmpl_user); 1313 } else 1314 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1315 pam_strerror(pamh, e)); 1316 rval = 0; 1317 break; 1318 1319 case PAM_AUTH_ERR: 1320 case PAM_USER_UNKNOWN: 1321 case PAM_MAXTRIES: 1322 rval = 1; 1323 break; 1324 1325 default: 1326 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1327 rval = -1; 1328 break; 1329 } 1330 1331 if (rval == 0) { 1332 e = pam_acct_mgmt(pamh, 0); 1333 if (e != PAM_SUCCESS) { 1334 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1335 pam_strerror(pamh, e)); 1336 rval = 1; 1337 } 1338 } 1339 1340 if (rval != 0) { 1341 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1342 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1343 } 1344 pamh = NULL; 1345 } 1346 return rval; 1347 } 1348 1349 #endif /* USE_PAM */ 1350 1351 void 1352 pass(char *passwd) 1353 { 1354 int rval, ecode; 1355 FILE *fd; 1356 #ifdef LOGIN_CAP 1357 login_cap_t *lc = NULL; 1358 #endif 1359 #ifdef USE_PAM 1360 int e; 1361 #endif 1362 char *residue = NULL; 1363 char *xpasswd; 1364 1365 if (logged_in || askpasswd == 0) { 1366 reply(503, "Login with USER first."); 1367 return; 1368 } 1369 askpasswd = 0; 1370 if (!guest) { /* "ftp" is only account allowed no password */ 1371 if (pw == NULL) { 1372 rval = 1; /* failure below */ 1373 goto skip; 1374 } 1375 #ifdef USE_PAM 1376 rval = auth_pam(&pw, passwd); 1377 if (rval >= 0) { 1378 goto skip; 1379 } 1380 #endif 1381 xpasswd = crypt(passwd, pw->pw_passwd); 1382 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1383 xpasswd = ":"; 1384 rval = strcmp(pw->pw_passwd, xpasswd); 1385 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1386 rval = 1; /* failure */ 1387 skip: 1388 /* 1389 * If rval == 1, the user failed the authentication check 1390 * above. If rval == 0, either PAM or local authentication 1391 * succeeded. 1392 */ 1393 if (rval) { 1394 reply(530, "Login incorrect."); 1395 BLACKLIST_NOTIFY(BLACKLIST_AUTH_FAIL, STDIN_FILENO, "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 } else { 1413 BLACKLIST_NOTIFY(BLACKLIST_AUTH_OK, STDIN_FILENO, "Login successful"); 1414 } 1415 } 1416 login_attempts = 0; /* this time successful */ 1417 if (setegid(pw->pw_gid) < 0) { 1418 reply(550, "Can't set gid."); 1419 return; 1420 } 1421 /* May be overridden by login.conf */ 1422 (void) umask(defumask); 1423 #ifdef LOGIN_CAP 1424 if ((lc = login_getpwclass(pw)) != NULL) { 1425 char remote_ip[NI_MAXHOST]; 1426 1427 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1428 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1429 NI_NUMERICHOST)) 1430 *remote_ip = 0; 1431 remote_ip[sizeof(remote_ip) - 1] = 0; 1432 if (!auth_hostok(lc, remotehost, remote_ip)) { 1433 syslog(LOG_INFO|LOG_AUTH, 1434 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1435 pw->pw_name); 1436 reply(530, "Permission denied."); 1437 pw = NULL; 1438 return; 1439 } 1440 if (!auth_timeok(lc, time(NULL))) { 1441 reply(530, "Login not available right now."); 1442 pw = NULL; 1443 return; 1444 } 1445 } 1446 setusercontext(lc, pw, 0, LOGIN_SETALL & 1447 ~(LOGIN_SETRESOURCES | LOGIN_SETUSER | LOGIN_SETPATH | LOGIN_SETENV)); 1448 #else 1449 setlogin(pw->pw_name); 1450 (void) 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 dochroot = 1464 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue, &ecode) 1465 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1466 || login_getcapbool(lc, "ftp-chroot", 0) 1467 #endif 1468 ; 1469 /* 1470 * It is possible that checkuser() failed to open the chroot file. 1471 * If this is the case, report that logins are un-available, since we 1472 * have no way of checking whether or not the user should be chrooted. 1473 * We ignore ENOENT since it is not required that this file be present. 1474 */ 1475 if (ecode != 0 && ecode != ENOENT) { 1476 reply(530, "Login not available right now."); 1477 return; 1478 } 1479 chrootdir = NULL; 1480 1481 /* Disable wtmp logging when chrooting. */ 1482 if (dochroot || guest) 1483 dowtmp = 0; 1484 if (dowtmp) 1485 ftpd_logwtmp(wtmpid, pw->pw_name, 1486 (struct sockaddr *)&his_addr); 1487 logged_in = 1; 1488 1489 #ifdef LOGIN_CAP 1490 setusercontext(lc, pw, 0, LOGIN_SETRESOURCES); 1491 #endif 1492 1493 if (guest && stats && statfd < 0) { 1494 #ifdef VIRTUAL_HOSTING 1495 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1496 #else 1497 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1498 #endif 1499 if (statfd < 0) 1500 stats = 0; 1501 } 1502 1503 /* 1504 * For a chrooted local user, 1505 * a) see whether ftpchroot(5) specifies a chroot directory, 1506 * b) extract the directory pathname from the line, 1507 * c) expand it to the absolute pathname if necessary. 1508 */ 1509 if (dochroot && residue && 1510 (chrootdir = strtok(residue, " \t")) != NULL) { 1511 if (chrootdir[0] != '/') 1512 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1513 else 1514 chrootdir = strdup(chrootdir); /* make it permanent */ 1515 if (chrootdir == NULL) 1516 fatalerror("Ran out of memory."); 1517 } 1518 if (guest || dochroot) { 1519 /* 1520 * If no chroot directory set yet, use the login directory. 1521 * Copy it so it can be modified while pw->pw_dir stays intact. 1522 */ 1523 if (chrootdir == NULL && 1524 (chrootdir = strdup(pw->pw_dir)) == NULL) 1525 fatalerror("Ran out of memory."); 1526 /* 1527 * Check for the "/chroot/./home" syntax, 1528 * separate the chroot and home directory pathnames. 1529 */ 1530 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1531 *(homedir++) = '\0'; /* wipe '/' */ 1532 homedir++; /* skip '.' */ 1533 } else { 1534 /* 1535 * We MUST do a chdir() after the chroot. Otherwise 1536 * the old current directory will be accessible as "." 1537 * outside the new root! 1538 */ 1539 homedir = "/"; 1540 } 1541 /* 1542 * Finally, do chroot() 1543 */ 1544 if (chroot(chrootdir) < 0) { 1545 reply(550, "Can't change root."); 1546 goto bad; 1547 } 1548 __FreeBSD_libc_enter_restricted_mode(); 1549 } else /* real user w/o chroot */ 1550 homedir = pw->pw_dir; 1551 /* 1552 * Set euid *before* doing chdir() so 1553 * a) the user won't be carried to a directory that he couldn't reach 1554 * on his own due to no permission to upper path components, 1555 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1556 * (uid 0 has no root power over NFS if not mapped explicitly.) 1557 */ 1558 if (seteuid(pw->pw_uid) < 0) { 1559 if (guest || dochroot) { 1560 fatalerror("Can't set uid."); 1561 } else { 1562 reply(550, "Can't set uid."); 1563 goto bad; 1564 } 1565 } 1566 /* 1567 * Do not allow the session to live if we're chroot()'ed and chdir() 1568 * fails. Otherwise the chroot jail can be escaped. 1569 */ 1570 if (chdir(homedir) < 0) { 1571 if (guest || dochroot) { 1572 fatalerror("Can't change to base directory."); 1573 } else { 1574 if (chdir("/") < 0) { 1575 reply(550, "Root is inaccessible."); 1576 goto bad; 1577 } 1578 lreply(230, "No directory! Logging in with home=/."); 1579 } 1580 } 1581 1582 /* 1583 * Display a login message, if it exists. 1584 * N.B. reply(230,) must follow the message. 1585 */ 1586 #ifdef VIRTUAL_HOSTING 1587 fd = fopen(thishost->loginmsg, "r"); 1588 #else 1589 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1590 #endif 1591 if (fd != NULL) { 1592 char *cp, line[LINE_MAX]; 1593 1594 while (fgets(line, sizeof(line), fd) != NULL) { 1595 if ((cp = strchr(line, '\n')) != NULL) 1596 *cp = '\0'; 1597 lreply(230, "%s", line); 1598 } 1599 (void) fflush(stdout); 1600 (void) fclose(fd); 1601 } 1602 if (guest) { 1603 if (ident != NULL) 1604 free(ident); 1605 ident = strdup(passwd); 1606 if (ident == NULL) 1607 fatalerror("Ran out of memory."); 1608 1609 reply(230, "Guest login ok, access restrictions apply."); 1610 #ifdef SETPROCTITLE 1611 #ifdef VIRTUAL_HOSTING 1612 if (thishost != firsthost) 1613 snprintf(proctitle, sizeof(proctitle), 1614 "%s: anonymous(%s)/%s", remotehost, hostname, 1615 passwd); 1616 else 1617 #endif 1618 snprintf(proctitle, sizeof(proctitle), 1619 "%s: anonymous/%s", remotehost, passwd); 1620 setproctitle("%s", proctitle); 1621 #endif /* SETPROCTITLE */ 1622 if (logging) 1623 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1624 remotehost, passwd); 1625 } else { 1626 if (dochroot) 1627 reply(230, "User %s logged in, " 1628 "access restrictions apply.", pw->pw_name); 1629 else 1630 reply(230, "User %s logged in.", pw->pw_name); 1631 1632 #ifdef SETPROCTITLE 1633 snprintf(proctitle, sizeof(proctitle), 1634 "%s: user/%s", remotehost, pw->pw_name); 1635 setproctitle("%s", proctitle); 1636 #endif /* SETPROCTITLE */ 1637 if (logging) 1638 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1639 remotehost, pw->pw_name); 1640 } 1641 if (logging && (guest || dochroot)) 1642 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1643 #ifdef LOGIN_CAP 1644 login_close(lc); 1645 #endif 1646 if (residue) 1647 free(residue); 1648 return; 1649 bad: 1650 /* Forget all about it... */ 1651 #ifdef LOGIN_CAP 1652 login_close(lc); 1653 #endif 1654 if (residue) 1655 free(residue); 1656 end_login(); 1657 } 1658 1659 void 1660 retrieve(char *cmd, char *name) 1661 { 1662 FILE *fin, *dout; 1663 struct stat st; 1664 int (*closefunc)(FILE *); 1665 time_t start; 1666 char line[BUFSIZ]; 1667 1668 if (cmd == 0) { 1669 fin = fopen(name, "r"), closefunc = fclose; 1670 st.st_size = 0; 1671 } else { 1672 (void) snprintf(line, sizeof(line), cmd, name); 1673 name = line; 1674 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1675 st.st_size = -1; 1676 st.st_blksize = BUFSIZ; 1677 } 1678 if (fin == NULL) { 1679 if (errno != 0) { 1680 perror_reply(550, name); 1681 if (cmd == 0) { 1682 LOGCMD("get", name); 1683 } 1684 } 1685 return; 1686 } 1687 byte_count = -1; 1688 if (cmd == 0) { 1689 if (fstat(fileno(fin), &st) < 0) { 1690 perror_reply(550, name); 1691 goto done; 1692 } 1693 if (!S_ISREG(st.st_mode)) { 1694 /* 1695 * Never sending a raw directory is a workaround 1696 * for buggy clients that will attempt to RETR 1697 * a directory before listing it, e.g., Mozilla. 1698 * Preventing a guest from getting irregular files 1699 * is a simple security measure. 1700 */ 1701 if (S_ISDIR(st.st_mode) || guest) { 1702 reply(550, "%s: not a plain file.", name); 1703 goto done; 1704 } 1705 st.st_size = -1; 1706 /* st.st_blksize is set for all descriptor types */ 1707 } 1708 } 1709 if (restart_point) { 1710 if (type == TYPE_A) { 1711 off_t i, n; 1712 int c; 1713 1714 n = restart_point; 1715 i = 0; 1716 while (i++ < n) { 1717 if ((c=getc(fin)) == EOF) { 1718 perror_reply(550, name); 1719 goto done; 1720 } 1721 if (c == '\n') 1722 i++; 1723 } 1724 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1725 perror_reply(550, name); 1726 goto done; 1727 } 1728 } 1729 dout = dataconn(name, st.st_size, "w"); 1730 if (dout == NULL) 1731 goto done; 1732 time(&start); 1733 send_data(fin, dout, st.st_blksize, st.st_size, 1734 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1735 if (cmd == 0 && guest && stats && byte_count > 0) 1736 logxfer(name, byte_count, start); 1737 (void) fclose(dout); 1738 data = -1; 1739 pdata = -1; 1740 done: 1741 if (cmd == 0) 1742 LOGBYTES("get", name, byte_count); 1743 (*closefunc)(fin); 1744 } 1745 1746 void 1747 store(char *name, char *mode, int unique) 1748 { 1749 int fd; 1750 FILE *fout, *din; 1751 int (*closefunc)(FILE *); 1752 1753 if (*mode == 'a') { /* APPE */ 1754 if (unique) { 1755 /* Programming error */ 1756 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1757 unique = 0; 1758 } 1759 if (guest && noguestmod) { 1760 reply(550, "Appending to existing file denied."); 1761 goto err; 1762 } 1763 restart_point = 0; /* not affected by preceding REST */ 1764 } 1765 if (unique) /* STOU overrides REST */ 1766 restart_point = 0; 1767 if (guest && noguestmod) { 1768 if (restart_point) { /* guest STOR w/REST */ 1769 reply(550, "Modifying existing file denied."); 1770 goto err; 1771 } else /* treat guest STOR as STOU */ 1772 unique = 1; 1773 } 1774 1775 if (restart_point) 1776 mode = "r+"; /* so ASCII manual seek can work */ 1777 if (unique) { 1778 if ((fd = guniquefd(name, &name)) < 0) 1779 goto err; 1780 fout = fdopen(fd, mode); 1781 } else 1782 fout = fopen(name, mode); 1783 closefunc = fclose; 1784 if (fout == NULL) { 1785 perror_reply(553, name); 1786 goto err; 1787 } 1788 byte_count = -1; 1789 if (restart_point) { 1790 if (type == TYPE_A) { 1791 off_t i, n; 1792 int c; 1793 1794 n = restart_point; 1795 i = 0; 1796 while (i++ < n) { 1797 if ((c=getc(fout)) == EOF) { 1798 perror_reply(550, name); 1799 goto done; 1800 } 1801 if (c == '\n') 1802 i++; 1803 } 1804 /* 1805 * We must do this seek to "current" position 1806 * because we are changing from reading to 1807 * writing. 1808 */ 1809 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1810 perror_reply(550, name); 1811 goto done; 1812 } 1813 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1814 perror_reply(550, name); 1815 goto done; 1816 } 1817 } 1818 din = dataconn(name, -1, "r"); 1819 if (din == NULL) 1820 goto done; 1821 if (receive_data(din, fout) == 0) { 1822 if (unique) 1823 reply(226, "Transfer complete (unique file name:%s).", 1824 name); 1825 else 1826 reply(226, "Transfer complete."); 1827 } 1828 (void) fclose(din); 1829 data = -1; 1830 pdata = -1; 1831 done: 1832 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1833 (*closefunc)(fout); 1834 return; 1835 err: 1836 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1837 return; 1838 } 1839 1840 static FILE * 1841 getdatasock(char *mode) 1842 { 1843 int on = 1, s, t, tries; 1844 1845 if (data >= 0) 1846 return (fdopen(data, mode)); 1847 1848 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1849 if (s < 0) 1850 goto bad; 1851 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1852 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1853 /* anchor socket to avoid multi-homing problems */ 1854 data_source = ctrl_addr; 1855 data_source.su_port = htons(dataport); 1856 (void) seteuid(0); 1857 for (tries = 1; ; tries++) { 1858 /* 1859 * We should loop here since it's possible that 1860 * another ftpd instance has passed this point and is 1861 * trying to open a data connection in active mode now. 1862 * Until the other connection is opened, we'll be getting 1863 * EADDRINUSE because no SOCK_STREAM sockets in the system 1864 * can share both local and remote addresses, localIP:20 1865 * and *:* in this case. 1866 */ 1867 if (bind(s, (struct sockaddr *)&data_source, 1868 data_source.su_len) >= 0) 1869 break; 1870 if (errno != EADDRINUSE || tries > 10) 1871 goto bad; 1872 sleep(tries); 1873 } 1874 (void) seteuid(pw->pw_uid); 1875 #ifdef IP_TOS 1876 if (data_source.su_family == AF_INET) 1877 { 1878 on = IPTOS_THROUGHPUT; 1879 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1880 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1881 } 1882 #endif 1883 #ifdef TCP_NOPUSH 1884 /* 1885 * Turn off push flag to keep sender TCP from sending short packets 1886 * at the boundaries of each write(). 1887 */ 1888 on = 1; 1889 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1890 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1891 #endif 1892 return (fdopen(s, mode)); 1893 bad: 1894 /* Return the real value of errno (close may change it) */ 1895 t = errno; 1896 (void) seteuid(pw->pw_uid); 1897 (void) close(s); 1898 errno = t; 1899 return (NULL); 1900 } 1901 1902 static FILE * 1903 dataconn(char *name, off_t size, char *mode) 1904 { 1905 char sizebuf[32]; 1906 FILE *file; 1907 int retry = 0, tos, conerrno; 1908 1909 file_size = size; 1910 byte_count = 0; 1911 if (size != -1) 1912 (void) snprintf(sizebuf, sizeof(sizebuf), 1913 " (%jd bytes)", (intmax_t)size); 1914 else 1915 *sizebuf = '\0'; 1916 if (pdata >= 0) { 1917 union sockunion from; 1918 socklen_t fromlen = ctrl_addr.su_len; 1919 int flags, s; 1920 struct timeval timeout; 1921 fd_set set; 1922 1923 FD_ZERO(&set); 1924 FD_SET(pdata, &set); 1925 1926 timeout.tv_usec = 0; 1927 timeout.tv_sec = 120; 1928 1929 /* 1930 * Granted a socket is in the blocking I/O mode, 1931 * accept() will block after a successful select() 1932 * if the selected connection dies in between. 1933 * Therefore set the non-blocking I/O flag here. 1934 */ 1935 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1936 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1937 goto pdata_err; 1938 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1939 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1940 goto pdata_err; 1941 (void) close(pdata); 1942 pdata = s; 1943 /* 1944 * Unset the inherited non-blocking I/O flag 1945 * on the child socket so stdio can work on it. 1946 */ 1947 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1948 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1949 goto pdata_err; 1950 #ifdef IP_TOS 1951 if (from.su_family == AF_INET) 1952 { 1953 tos = IPTOS_THROUGHPUT; 1954 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1955 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1956 } 1957 #endif 1958 reply(150, "Opening %s mode data connection for '%s'%s.", 1959 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1960 return (fdopen(pdata, mode)); 1961 pdata_err: 1962 reply(425, "Can't open data connection."); 1963 (void) close(pdata); 1964 pdata = -1; 1965 return (NULL); 1966 } 1967 if (data >= 0) { 1968 reply(125, "Using existing data connection for '%s'%s.", 1969 name, sizebuf); 1970 usedefault = 1; 1971 return (fdopen(data, mode)); 1972 } 1973 if (usedefault) 1974 data_dest = his_addr; 1975 usedefault = 1; 1976 do { 1977 file = getdatasock(mode); 1978 if (file == NULL) { 1979 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1980 1981 if (getnameinfo((struct sockaddr *)&data_source, 1982 data_source.su_len, 1983 hostbuf, sizeof(hostbuf) - 1, 1984 portbuf, sizeof(portbuf) - 1, 1985 NI_NUMERICHOST|NI_NUMERICSERV)) 1986 *hostbuf = *portbuf = 0; 1987 hostbuf[sizeof(hostbuf) - 1] = 0; 1988 portbuf[sizeof(portbuf) - 1] = 0; 1989 reply(425, "Can't create data socket (%s,%s): %s.", 1990 hostbuf, portbuf, strerror(errno)); 1991 return (NULL); 1992 } 1993 data = fileno(file); 1994 conerrno = 0; 1995 if (connect(data, (struct sockaddr *)&data_dest, 1996 data_dest.su_len) == 0) 1997 break; 1998 conerrno = errno; 1999 (void) fclose(file); 2000 data = -1; 2001 if (conerrno == EADDRINUSE) { 2002 sleep(swaitint); 2003 retry += swaitint; 2004 } else { 2005 break; 2006 } 2007 } while (retry <= swaitmax); 2008 if (conerrno != 0) { 2009 reply(425, "Can't build data connection: %s.", 2010 strerror(conerrno)); 2011 return (NULL); 2012 } 2013 reply(150, "Opening %s mode data connection for '%s'%s.", 2014 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2015 return (file); 2016 } 2017 2018 /* 2019 * A helper macro to avoid code duplication 2020 * in send_data() and receive_data(). 2021 * 2022 * XXX We have to block SIGURG during putc() because BSD stdio 2023 * is unable to restart interrupted write operations and hence 2024 * the entire buffer contents will be lost as soon as a write() 2025 * call indicates EINTR to stdio. 2026 */ 2027 #define FTPD_PUTC(ch, file, label) \ 2028 do { \ 2029 int ret; \ 2030 \ 2031 do { \ 2032 START_UNSAFE; \ 2033 ret = putc((ch), (file)); \ 2034 END_UNSAFE; \ 2035 CHECKOOB(return (-1)) \ 2036 else if (ferror(file)) \ 2037 goto label; \ 2038 clearerr(file); \ 2039 } while (ret == EOF); \ 2040 } while (0) 2041 2042 /* 2043 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2044 * encapsulation of the data subject to Mode, Structure, and Type. 2045 * 2046 * NB: Form isn't handled. 2047 */ 2048 static int 2049 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2050 { 2051 int c, cp, filefd, netfd; 2052 char *buf; 2053 2054 STARTXFER; 2055 2056 switch (type) { 2057 2058 case TYPE_A: 2059 cp = EOF; 2060 for (;;) { 2061 c = getc(instr); 2062 CHECKOOB(return (-1)) 2063 else if (c == EOF && ferror(instr)) 2064 goto file_err; 2065 if (c == EOF) { 2066 if (ferror(instr)) { /* resume after OOB */ 2067 clearerr(instr); 2068 continue; 2069 } 2070 if (feof(instr)) /* EOF */ 2071 break; 2072 syslog(LOG_ERR, "Internal: impossible condition" 2073 " on file after getc()"); 2074 goto file_err; 2075 } 2076 if (c == '\n' && cp != '\r') { 2077 FTPD_PUTC('\r', outstr, data_err); 2078 byte_count++; 2079 } 2080 FTPD_PUTC(c, outstr, data_err); 2081 byte_count++; 2082 cp = c; 2083 } 2084 #ifdef notyet /* BSD stdio isn't ready for that */ 2085 while (fflush(outstr) == EOF) { 2086 CHECKOOB(return (-1)) 2087 else 2088 goto data_err; 2089 clearerr(outstr); 2090 } 2091 ENDXFER; 2092 #else 2093 ENDXFER; 2094 if (fflush(outstr) == EOF) 2095 goto data_err; 2096 #endif 2097 reply(226, "Transfer complete."); 2098 return (0); 2099 2100 case TYPE_I: 2101 case TYPE_L: 2102 /* 2103 * isreg is only set if we are not doing restart and we 2104 * are sending a regular file 2105 */ 2106 netfd = fileno(outstr); 2107 filefd = fileno(instr); 2108 2109 if (isreg) { 2110 char *msg = "Transfer complete."; 2111 off_t cnt, offset; 2112 int err; 2113 2114 cnt = offset = 0; 2115 2116 while (filesize > 0) { 2117 err = sendfile(filefd, netfd, offset, 0, 2118 NULL, &cnt, 0); 2119 /* 2120 * Calculate byte_count before OOB processing. 2121 * It can be used in myoob() later. 2122 */ 2123 byte_count += cnt; 2124 offset += cnt; 2125 filesize -= cnt; 2126 CHECKOOB(return (-1)) 2127 else if (err == -1) { 2128 if (errno != EINTR && 2129 cnt == 0 && offset == 0) 2130 goto oldway; 2131 goto data_err; 2132 } 2133 if (err == -1) /* resume after OOB */ 2134 continue; 2135 /* 2136 * We hit the EOF prematurely. 2137 * Perhaps the file was externally truncated. 2138 */ 2139 if (cnt == 0) { 2140 msg = "Transfer finished due to " 2141 "premature end of file."; 2142 break; 2143 } 2144 } 2145 ENDXFER; 2146 reply(226, "%s", msg); 2147 return (0); 2148 } 2149 2150 oldway: 2151 if ((buf = malloc(blksize)) == NULL) { 2152 ENDXFER; 2153 reply(451, "Ran out of memory."); 2154 return (-1); 2155 } 2156 2157 for (;;) { 2158 int cnt, len; 2159 char *bp; 2160 2161 cnt = read(filefd, buf, blksize); 2162 CHECKOOB(free(buf); return (-1)) 2163 else if (cnt < 0) { 2164 free(buf); 2165 goto file_err; 2166 } 2167 if (cnt < 0) /* resume after OOB */ 2168 continue; 2169 if (cnt == 0) /* EOF */ 2170 break; 2171 for (len = cnt, bp = buf; len > 0;) { 2172 cnt = write(netfd, bp, len); 2173 CHECKOOB(free(buf); return (-1)) 2174 else if (cnt < 0) { 2175 free(buf); 2176 goto data_err; 2177 } 2178 if (cnt <= 0) 2179 continue; 2180 len -= cnt; 2181 bp += cnt; 2182 byte_count += cnt; 2183 } 2184 } 2185 ENDXFER; 2186 free(buf); 2187 reply(226, "Transfer complete."); 2188 return (0); 2189 default: 2190 ENDXFER; 2191 reply(550, "Unimplemented TYPE %d in send_data.", type); 2192 return (-1); 2193 } 2194 2195 data_err: 2196 ENDXFER; 2197 perror_reply(426, "Data connection"); 2198 return (-1); 2199 2200 file_err: 2201 ENDXFER; 2202 perror_reply(551, "Error on input file"); 2203 return (-1); 2204 } 2205 2206 /* 2207 * Transfer data from peer to "outstr" using the appropriate encapulation of 2208 * the data subject to Mode, Structure, and Type. 2209 * 2210 * N.B.: Form isn't handled. 2211 */ 2212 static int 2213 receive_data(FILE *instr, FILE *outstr) 2214 { 2215 int c, cp; 2216 int bare_lfs = 0; 2217 2218 STARTXFER; 2219 2220 switch (type) { 2221 2222 case TYPE_I: 2223 case TYPE_L: 2224 for (;;) { 2225 int cnt, len; 2226 char *bp; 2227 char buf[BUFSIZ]; 2228 2229 cnt = read(fileno(instr), buf, sizeof(buf)); 2230 CHECKOOB(return (-1)) 2231 else if (cnt < 0) 2232 goto data_err; 2233 if (cnt < 0) /* resume after OOB */ 2234 continue; 2235 if (cnt == 0) /* EOF */ 2236 break; 2237 for (len = cnt, bp = buf; len > 0;) { 2238 cnt = write(fileno(outstr), bp, len); 2239 CHECKOOB(return (-1)) 2240 else if (cnt < 0) 2241 goto file_err; 2242 if (cnt <= 0) 2243 continue; 2244 len -= cnt; 2245 bp += cnt; 2246 byte_count += cnt; 2247 } 2248 } 2249 ENDXFER; 2250 return (0); 2251 2252 case TYPE_E: 2253 ENDXFER; 2254 reply(553, "TYPE E not implemented."); 2255 return (-1); 2256 2257 case TYPE_A: 2258 cp = EOF; 2259 for (;;) { 2260 c = getc(instr); 2261 CHECKOOB(return (-1)) 2262 else if (c == EOF && ferror(instr)) 2263 goto data_err; 2264 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2265 clearerr(instr); 2266 continue; 2267 } 2268 2269 if (cp == '\r') { 2270 if (c != '\n') 2271 FTPD_PUTC('\r', outstr, file_err); 2272 } else 2273 if (c == '\n') 2274 bare_lfs++; 2275 if (c == '\r') { 2276 byte_count++; 2277 cp = c; 2278 continue; 2279 } 2280 2281 /* Check for EOF here in order not to lose last \r. */ 2282 if (c == EOF) { 2283 if (feof(instr)) /* EOF */ 2284 break; 2285 syslog(LOG_ERR, "Internal: impossible condition" 2286 " on data stream after getc()"); 2287 goto data_err; 2288 } 2289 2290 byte_count++; 2291 FTPD_PUTC(c, outstr, file_err); 2292 cp = c; 2293 } 2294 #ifdef notyet /* BSD stdio isn't ready for that */ 2295 while (fflush(outstr) == EOF) { 2296 CHECKOOB(return (-1)) 2297 else 2298 goto file_err; 2299 clearerr(outstr); 2300 } 2301 ENDXFER; 2302 #else 2303 ENDXFER; 2304 if (fflush(outstr) == EOF) 2305 goto file_err; 2306 #endif 2307 if (bare_lfs) { 2308 lreply(226, 2309 "WARNING! %d bare linefeeds received in ASCII mode.", 2310 bare_lfs); 2311 (void)printf(" File may not have transferred correctly.\r\n"); 2312 } 2313 return (0); 2314 default: 2315 ENDXFER; 2316 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2317 return (-1); 2318 } 2319 2320 data_err: 2321 ENDXFER; 2322 perror_reply(426, "Data connection"); 2323 return (-1); 2324 2325 file_err: 2326 ENDXFER; 2327 perror_reply(452, "Error writing to file"); 2328 return (-1); 2329 } 2330 2331 void 2332 statfilecmd(char *filename) 2333 { 2334 FILE *fin; 2335 int atstart; 2336 int c, code; 2337 char line[LINE_MAX]; 2338 struct stat st; 2339 2340 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2341 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2342 fin = ftpd_popen(line, "r"); 2343 if (fin == NULL) { 2344 perror_reply(551, filename); 2345 return; 2346 } 2347 lreply(code, "Status of %s:", filename); 2348 atstart = 1; 2349 while ((c = getc(fin)) != EOF) { 2350 if (c == '\n') { 2351 if (ferror(stdout)){ 2352 perror_reply(421, "Control connection"); 2353 (void) ftpd_pclose(fin); 2354 dologout(1); 2355 /* NOTREACHED */ 2356 } 2357 if (ferror(fin)) { 2358 perror_reply(551, filename); 2359 (void) ftpd_pclose(fin); 2360 return; 2361 } 2362 (void) putc('\r', stdout); 2363 } 2364 /* 2365 * RFC 959 says neutral text should be prepended before 2366 * a leading 3-digit number followed by whitespace, but 2367 * many ftp clients can be confused by any leading digits, 2368 * as a matter of fact. 2369 */ 2370 if (atstart && isdigit(c)) 2371 (void) putc(' ', stdout); 2372 (void) putc(c, stdout); 2373 atstart = (c == '\n'); 2374 } 2375 (void) ftpd_pclose(fin); 2376 reply(code, "End of status."); 2377 } 2378 2379 void 2380 statcmd(void) 2381 { 2382 union sockunion *su; 2383 u_char *a, *p; 2384 char hname[NI_MAXHOST]; 2385 int ispassive; 2386 2387 if (hostinfo) { 2388 lreply(211, "%s FTP server status:", hostname); 2389 printf(" %s\r\n", version); 2390 } else 2391 lreply(211, "FTP server status:"); 2392 printf(" Connected to %s", remotehost); 2393 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2394 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2395 hname[sizeof(hname) - 1] = 0; 2396 if (strcmp(hname, remotehost) != 0) 2397 printf(" (%s)", hname); 2398 } 2399 printf("\r\n"); 2400 if (logged_in) { 2401 if (guest) 2402 printf(" Logged in anonymously\r\n"); 2403 else 2404 printf(" Logged in as %s\r\n", pw->pw_name); 2405 } else if (askpasswd) 2406 printf(" Waiting for password\r\n"); 2407 else 2408 printf(" Waiting for user name\r\n"); 2409 printf(" TYPE: %s", typenames[type]); 2410 if (type == TYPE_A || type == TYPE_E) 2411 printf(", FORM: %s", formnames[form]); 2412 if (type == TYPE_L) 2413 #if CHAR_BIT == 8 2414 printf(" %d", CHAR_BIT); 2415 #else 2416 printf(" %d", bytesize); /* need definition! */ 2417 #endif 2418 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2419 strunames[stru], modenames[mode]); 2420 if (data != -1) 2421 printf(" Data connection open\r\n"); 2422 else if (pdata != -1) { 2423 ispassive = 1; 2424 su = &pasv_addr; 2425 goto printaddr; 2426 } else if (usedefault == 0) { 2427 ispassive = 0; 2428 su = &data_dest; 2429 printaddr: 2430 #define UC(b) (((int) b) & 0xff) 2431 if (epsvall) { 2432 printf(" EPSV only mode (EPSV ALL)\r\n"); 2433 goto epsvonly; 2434 } 2435 2436 /* PORT/PASV */ 2437 if (su->su_family == AF_INET) { 2438 a = (u_char *) &su->su_sin.sin_addr; 2439 p = (u_char *) &su->su_sin.sin_port; 2440 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2441 ispassive ? "PASV" : "PORT", 2442 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2443 UC(p[0]), UC(p[1])); 2444 } 2445 2446 /* LPRT/LPSV */ 2447 { 2448 int alen, af, i; 2449 2450 switch (su->su_family) { 2451 case AF_INET: 2452 a = (u_char *) &su->su_sin.sin_addr; 2453 p = (u_char *) &su->su_sin.sin_port; 2454 alen = sizeof(su->su_sin.sin_addr); 2455 af = 4; 2456 break; 2457 case AF_INET6: 2458 a = (u_char *) &su->su_sin6.sin6_addr; 2459 p = (u_char *) &su->su_sin6.sin6_port; 2460 alen = sizeof(su->su_sin6.sin6_addr); 2461 af = 6; 2462 break; 2463 default: 2464 af = 0; 2465 break; 2466 } 2467 if (af) { 2468 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2469 af, alen); 2470 for (i = 0; i < alen; i++) 2471 printf("%d,", UC(a[i])); 2472 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2473 } 2474 } 2475 2476 epsvonly:; 2477 /* EPRT/EPSV */ 2478 { 2479 int af; 2480 2481 switch (su->su_family) { 2482 case AF_INET: 2483 af = 1; 2484 break; 2485 case AF_INET6: 2486 af = 2; 2487 break; 2488 default: 2489 af = 0; 2490 break; 2491 } 2492 if (af) { 2493 union sockunion tmp; 2494 2495 tmp = *su; 2496 if (tmp.su_family == AF_INET6) 2497 tmp.su_sin6.sin6_scope_id = 0; 2498 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2499 hname, sizeof(hname) - 1, NULL, 0, 2500 NI_NUMERICHOST)) { 2501 hname[sizeof(hname) - 1] = 0; 2502 printf(" %s |%d|%s|%d|\r\n", 2503 ispassive ? "EPSV" : "EPRT", 2504 af, hname, htons(tmp.su_port)); 2505 } 2506 } 2507 } 2508 #undef UC 2509 } else 2510 printf(" No data connection\r\n"); 2511 reply(211, "End of status."); 2512 } 2513 2514 void 2515 fatalerror(char *s) 2516 { 2517 2518 reply(451, "Error in server: %s", s); 2519 reply(221, "Closing connection due to server error."); 2520 dologout(0); 2521 /* NOTREACHED */ 2522 } 2523 2524 void 2525 reply(int n, const char *fmt, ...) 2526 { 2527 va_list ap; 2528 2529 (void)printf("%d ", n); 2530 va_start(ap, fmt); 2531 (void)vprintf(fmt, ap); 2532 va_end(ap); 2533 (void)printf("\r\n"); 2534 (void)fflush(stdout); 2535 if (ftpdebug) { 2536 syslog(LOG_DEBUG, "<--- %d ", n); 2537 va_start(ap, fmt); 2538 vsyslog(LOG_DEBUG, fmt, ap); 2539 va_end(ap); 2540 } 2541 } 2542 2543 void 2544 lreply(int n, const char *fmt, ...) 2545 { 2546 va_list ap; 2547 2548 (void)printf("%d- ", n); 2549 va_start(ap, fmt); 2550 (void)vprintf(fmt, ap); 2551 va_end(ap); 2552 (void)printf("\r\n"); 2553 (void)fflush(stdout); 2554 if (ftpdebug) { 2555 syslog(LOG_DEBUG, "<--- %d- ", n); 2556 va_start(ap, fmt); 2557 vsyslog(LOG_DEBUG, fmt, ap); 2558 va_end(ap); 2559 } 2560 } 2561 2562 static void 2563 ack(char *s) 2564 { 2565 2566 reply(250, "%s command successful.", s); 2567 } 2568 2569 void 2570 nack(char *s) 2571 { 2572 2573 reply(502, "%s command not implemented.", s); 2574 } 2575 2576 /* ARGSUSED */ 2577 void 2578 yyerror(char *s) 2579 { 2580 char *cp; 2581 2582 if ((cp = strchr(cbuf,'\n'))) 2583 *cp = '\0'; 2584 reply(500, "%s: command not understood.", cbuf); 2585 } 2586 2587 void 2588 delete(char *name) 2589 { 2590 struct stat st; 2591 2592 LOGCMD("delete", name); 2593 if (lstat(name, &st) < 0) { 2594 perror_reply(550, name); 2595 return; 2596 } 2597 if (S_ISDIR(st.st_mode)) { 2598 if (rmdir(name) < 0) { 2599 perror_reply(550, name); 2600 return; 2601 } 2602 goto done; 2603 } 2604 if (guest && noguestmod) { 2605 reply(550, "Operation not permitted."); 2606 return; 2607 } 2608 if (unlink(name) < 0) { 2609 perror_reply(550, name); 2610 return; 2611 } 2612 done: 2613 ack("DELE"); 2614 } 2615 2616 void 2617 cwd(char *path) 2618 { 2619 2620 if (chdir(path) < 0) 2621 perror_reply(550, path); 2622 else 2623 ack("CWD"); 2624 } 2625 2626 void 2627 makedir(char *name) 2628 { 2629 char *s; 2630 2631 LOGCMD("mkdir", name); 2632 if (guest && noguestmkd) 2633 reply(550, "Operation not permitted."); 2634 else if (mkdir(name, 0777) < 0) 2635 perror_reply(550, name); 2636 else { 2637 if ((s = doublequote(name)) == NULL) 2638 fatalerror("Ran out of memory."); 2639 reply(257, "\"%s\" directory created.", s); 2640 free(s); 2641 } 2642 } 2643 2644 void 2645 removedir(char *name) 2646 { 2647 2648 LOGCMD("rmdir", name); 2649 if (rmdir(name) < 0) 2650 perror_reply(550, name); 2651 else 2652 ack("RMD"); 2653 } 2654 2655 void 2656 pwd(void) 2657 { 2658 char *s, path[MAXPATHLEN + 1]; 2659 2660 if (getcwd(path, sizeof(path)) == NULL) 2661 perror_reply(550, "Get current directory"); 2662 else { 2663 if ((s = doublequote(path)) == NULL) 2664 fatalerror("Ran out of memory."); 2665 reply(257, "\"%s\" is current directory.", s); 2666 free(s); 2667 } 2668 } 2669 2670 char * 2671 renamefrom(char *name) 2672 { 2673 struct stat st; 2674 2675 if (guest && noguestmod) { 2676 reply(550, "Operation not permitted."); 2677 return (NULL); 2678 } 2679 if (lstat(name, &st) < 0) { 2680 perror_reply(550, name); 2681 return (NULL); 2682 } 2683 reply(350, "File exists, ready for destination name."); 2684 return (name); 2685 } 2686 2687 void 2688 renamecmd(char *from, char *to) 2689 { 2690 struct stat st; 2691 2692 LOGCMD2("rename", from, to); 2693 2694 if (guest && (stat(to, &st) == 0)) { 2695 reply(550, "%s: permission denied.", to); 2696 return; 2697 } 2698 2699 if (rename(from, to) < 0) 2700 perror_reply(550, "rename"); 2701 else 2702 ack("RNTO"); 2703 } 2704 2705 static void 2706 dolog(struct sockaddr *who) 2707 { 2708 char who_name[NI_MAXHOST]; 2709 2710 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2711 remotehost[sizeof(remotehost) - 1] = 0; 2712 if (getnameinfo(who, who->sa_len, 2713 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2714 *who_name = 0; 2715 who_name[sizeof(who_name) - 1] = 0; 2716 2717 #ifdef SETPROCTITLE 2718 #ifdef VIRTUAL_HOSTING 2719 if (thishost != firsthost) 2720 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2721 remotehost, hostname); 2722 else 2723 #endif 2724 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2725 remotehost); 2726 setproctitle("%s", proctitle); 2727 #endif /* SETPROCTITLE */ 2728 2729 if (logging) { 2730 #ifdef VIRTUAL_HOSTING 2731 if (thishost != firsthost) 2732 syslog(LOG_INFO, "connection from %s (%s) to %s", 2733 remotehost, who_name, hostname); 2734 else 2735 #endif 2736 syslog(LOG_INFO, "connection from %s (%s)", 2737 remotehost, who_name); 2738 } 2739 } 2740 2741 /* 2742 * Record logout in wtmp file 2743 * and exit with supplied status. 2744 */ 2745 void 2746 dologout(int status) 2747 { 2748 2749 if (logged_in && dowtmp) { 2750 (void) seteuid(0); 2751 #ifdef LOGIN_CAP 2752 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 2753 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 2754 LOGIN_SETENV)); 2755 #endif 2756 ftpd_logwtmp(wtmpid, NULL, NULL); 2757 } 2758 /* beware of flushing buffers after a SIGPIPE */ 2759 _exit(status); 2760 } 2761 2762 static void 2763 sigurg(int signo) 2764 { 2765 2766 recvurg = 1; 2767 } 2768 2769 static void 2770 maskurg(int flag) 2771 { 2772 int oerrno; 2773 sigset_t sset; 2774 2775 if (!transflag) { 2776 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2777 return; 2778 } 2779 oerrno = errno; 2780 sigemptyset(&sset); 2781 sigaddset(&sset, SIGURG); 2782 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2783 errno = oerrno; 2784 } 2785 2786 static void 2787 flagxfer(int flag) 2788 { 2789 2790 if (flag) { 2791 if (transflag) 2792 syslog(LOG_ERR, "Internal: flagxfer(1): " 2793 "transfer already under way"); 2794 transflag = 1; 2795 maskurg(0); 2796 recvurg = 0; 2797 } else { 2798 if (!transflag) 2799 syslog(LOG_ERR, "Internal: flagxfer(0): " 2800 "no active transfer"); 2801 maskurg(1); 2802 transflag = 0; 2803 } 2804 } 2805 2806 /* 2807 * Returns 0 if OK to resume or -1 if abort requested. 2808 */ 2809 static int 2810 myoob(void) 2811 { 2812 char *cp; 2813 int ret; 2814 2815 if (!transflag) { 2816 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2817 return (0); 2818 } 2819 cp = tmpline; 2820 ret = get_line(cp, 7, stdin); 2821 if (ret == -1) { 2822 reply(221, "You could at least say goodbye."); 2823 dologout(0); 2824 } else if (ret == -2) { 2825 /* Ignore truncated command. */ 2826 return (0); 2827 } 2828 upper(cp); 2829 if (strcmp(cp, "ABOR\r\n") == 0) { 2830 tmpline[0] = '\0'; 2831 reply(426, "Transfer aborted. Data connection closed."); 2832 reply(226, "Abort successful."); 2833 return (-1); 2834 } 2835 if (strcmp(cp, "STAT\r\n") == 0) { 2836 tmpline[0] = '\0'; 2837 if (file_size != -1) 2838 reply(213, "Status: %jd of %jd bytes transferred.", 2839 (intmax_t)byte_count, (intmax_t)file_size); 2840 else 2841 reply(213, "Status: %jd bytes transferred.", 2842 (intmax_t)byte_count); 2843 } 2844 return (0); 2845 } 2846 2847 /* 2848 * Note: a response of 425 is not mentioned as a possible response to 2849 * the PASV command in RFC959. However, it has been blessed as 2850 * a legitimate response by Jon Postel in a telephone conversation 2851 * with Rick Adams on 25 Jan 89. 2852 */ 2853 void 2854 passive(void) 2855 { 2856 socklen_t len; 2857 int on; 2858 char *p, *a; 2859 2860 if (pdata >= 0) /* close old port if one set */ 2861 close(pdata); 2862 2863 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2864 if (pdata < 0) { 2865 perror_reply(425, "Can't open passive connection"); 2866 return; 2867 } 2868 on = 1; 2869 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2870 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2871 2872 (void) seteuid(0); 2873 2874 #ifdef IP_PORTRANGE 2875 if (ctrl_addr.su_family == AF_INET) { 2876 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2877 : IP_PORTRANGE_DEFAULT; 2878 2879 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2880 &on, sizeof(on)) < 0) 2881 goto pasv_error; 2882 } 2883 #endif 2884 #ifdef IPV6_PORTRANGE 2885 if (ctrl_addr.su_family == AF_INET6) { 2886 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2887 : IPV6_PORTRANGE_DEFAULT; 2888 2889 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2890 &on, sizeof(on)) < 0) 2891 goto pasv_error; 2892 } 2893 #endif 2894 2895 pasv_addr = ctrl_addr; 2896 pasv_addr.su_port = 0; 2897 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2898 goto pasv_error; 2899 2900 (void) seteuid(pw->pw_uid); 2901 2902 len = sizeof(pasv_addr); 2903 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2904 goto pasv_error; 2905 if (listen(pdata, 1) < 0) 2906 goto pasv_error; 2907 if (pasv_addr.su_family == AF_INET) 2908 a = (char *) &pasv_addr.su_sin.sin_addr; 2909 else if (pasv_addr.su_family == AF_INET6 && 2910 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2911 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2912 else 2913 goto pasv_error; 2914 2915 p = (char *) &pasv_addr.su_port; 2916 2917 #define UC(b) (((int) b) & 0xff) 2918 2919 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2920 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2921 return; 2922 2923 pasv_error: 2924 (void) seteuid(pw->pw_uid); 2925 (void) close(pdata); 2926 pdata = -1; 2927 perror_reply(425, "Can't open passive connection"); 2928 return; 2929 } 2930 2931 /* 2932 * Long Passive defined in RFC 1639. 2933 * 228 Entering Long Passive Mode 2934 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2935 */ 2936 2937 void 2938 long_passive(char *cmd, int pf) 2939 { 2940 socklen_t len; 2941 int on; 2942 char *p, *a; 2943 2944 if (pdata >= 0) /* close old port if one set */ 2945 close(pdata); 2946 2947 if (pf != PF_UNSPEC) { 2948 if (ctrl_addr.su_family != pf) { 2949 switch (ctrl_addr.su_family) { 2950 case AF_INET: 2951 pf = 1; 2952 break; 2953 case AF_INET6: 2954 pf = 2; 2955 break; 2956 default: 2957 pf = 0; 2958 break; 2959 } 2960 /* 2961 * XXX 2962 * only EPRT/EPSV ready clients will understand this 2963 */ 2964 if (strcmp(cmd, "EPSV") == 0 && pf) { 2965 reply(522, "Network protocol mismatch, " 2966 "use (%d)", pf); 2967 } else 2968 reply(501, "Network protocol mismatch."); /*XXX*/ 2969 2970 return; 2971 } 2972 } 2973 2974 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2975 if (pdata < 0) { 2976 perror_reply(425, "Can't open passive connection"); 2977 return; 2978 } 2979 on = 1; 2980 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2981 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2982 2983 (void) seteuid(0); 2984 2985 pasv_addr = ctrl_addr; 2986 pasv_addr.su_port = 0; 2987 len = pasv_addr.su_len; 2988 2989 #ifdef IP_PORTRANGE 2990 if (ctrl_addr.su_family == AF_INET) { 2991 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2992 : IP_PORTRANGE_DEFAULT; 2993 2994 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2995 &on, sizeof(on)) < 0) 2996 goto pasv_error; 2997 } 2998 #endif 2999 #ifdef IPV6_PORTRANGE 3000 if (ctrl_addr.su_family == AF_INET6) { 3001 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 3002 : IPV6_PORTRANGE_DEFAULT; 3003 3004 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 3005 &on, sizeof(on)) < 0) 3006 goto pasv_error; 3007 } 3008 #endif 3009 3010 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 3011 goto pasv_error; 3012 3013 (void) seteuid(pw->pw_uid); 3014 3015 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 3016 goto pasv_error; 3017 if (listen(pdata, 1) < 0) 3018 goto pasv_error; 3019 3020 #define UC(b) (((int) b) & 0xff) 3021 3022 if (strcmp(cmd, "LPSV") == 0) { 3023 p = (char *)&pasv_addr.su_port; 3024 switch (pasv_addr.su_family) { 3025 case AF_INET: 3026 a = (char *) &pasv_addr.su_sin.sin_addr; 3027 v4_reply: 3028 reply(228, 3029 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3030 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3031 2, UC(p[0]), UC(p[1])); 3032 return; 3033 case AF_INET6: 3034 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3035 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3036 goto v4_reply; 3037 } 3038 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3039 reply(228, 3040 "Entering Long Passive Mode " 3041 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3042 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3043 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3044 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3045 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3046 2, UC(p[0]), UC(p[1])); 3047 return; 3048 } 3049 } else if (strcmp(cmd, "EPSV") == 0) { 3050 switch (pasv_addr.su_family) { 3051 case AF_INET: 3052 case AF_INET6: 3053 reply(229, "Entering Extended Passive Mode (|||%d|)", 3054 ntohs(pasv_addr.su_port)); 3055 return; 3056 } 3057 } else { 3058 /* more proper error code? */ 3059 } 3060 3061 pasv_error: 3062 (void) seteuid(pw->pw_uid); 3063 (void) close(pdata); 3064 pdata = -1; 3065 perror_reply(425, "Can't open passive connection"); 3066 return; 3067 } 3068 3069 /* 3070 * Generate unique name for file with basename "local" 3071 * and open the file in order to avoid possible races. 3072 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3073 * Return descriptor to the file, set "name" to its name. 3074 * 3075 * Generates failure reply on error. 3076 */ 3077 static int 3078 guniquefd(char *local, char **name) 3079 { 3080 static char new[MAXPATHLEN]; 3081 struct stat st; 3082 char *cp; 3083 int count; 3084 int fd; 3085 3086 cp = strrchr(local, '/'); 3087 if (cp) 3088 *cp = '\0'; 3089 if (stat(cp ? local : ".", &st) < 0) { 3090 perror_reply(553, cp ? local : "."); 3091 return (-1); 3092 } 3093 if (cp) { 3094 /* 3095 * Let not overwrite dirname with counter suffix. 3096 * -4 is for /nn\0 3097 * In this extreme case dot won't be put in front of suffix. 3098 */ 3099 if (strlen(local) > sizeof(new) - 4) { 3100 reply(553, "Pathname too long."); 3101 return (-1); 3102 } 3103 *cp = '/'; 3104 } 3105 /* -4 is for the .nn<null> we put on the end below */ 3106 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3107 cp = new + strlen(new); 3108 /* 3109 * Don't generate dotfile unless requested explicitly. 3110 * This covers the case when basename gets truncated off 3111 * by buffer size. 3112 */ 3113 if (cp > new && cp[-1] != '/') 3114 *cp++ = '.'; 3115 for (count = 0; count < 100; count++) { 3116 /* At count 0 try unmodified name */ 3117 if (count) 3118 (void)sprintf(cp, "%d", count); 3119 if ((fd = open(count ? new : local, 3120 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3121 *name = count ? new : local; 3122 return (fd); 3123 } 3124 if (errno != EEXIST) { 3125 perror_reply(553, count ? new : local); 3126 return (-1); 3127 } 3128 } 3129 reply(452, "Unique file name cannot be created."); 3130 return (-1); 3131 } 3132 3133 /* 3134 * Format and send reply containing system error number. 3135 */ 3136 void 3137 perror_reply(int code, char *string) 3138 { 3139 3140 reply(code, "%s: %s.", string, strerror(errno)); 3141 } 3142 3143 static char *onefile[] = { 3144 "", 3145 0 3146 }; 3147 3148 void 3149 send_file_list(char *whichf) 3150 { 3151 struct stat st; 3152 DIR *dirp = NULL; 3153 struct dirent *dir; 3154 FILE *dout = NULL; 3155 char **dirlist, *dirname; 3156 int simple = 0; 3157 int freeglob = 0; 3158 glob_t gl; 3159 3160 if (strpbrk(whichf, "~{[*?") != NULL) { 3161 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3162 3163 memset(&gl, 0, sizeof(gl)); 3164 gl.gl_matchc = MAXGLOBARGS; 3165 flags |= GLOB_LIMIT; 3166 freeglob = 1; 3167 if (glob(whichf, flags, 0, &gl)) { 3168 reply(550, "No matching files found."); 3169 goto out; 3170 } else if (gl.gl_pathc == 0) { 3171 errno = ENOENT; 3172 perror_reply(550, whichf); 3173 goto out; 3174 } 3175 dirlist = gl.gl_pathv; 3176 } else { 3177 onefile[0] = whichf; 3178 dirlist = onefile; 3179 simple = 1; 3180 } 3181 3182 while ((dirname = *dirlist++)) { 3183 if (stat(dirname, &st) < 0) { 3184 /* 3185 * If user typed "ls -l", etc, and the client 3186 * used NLST, do what the user meant. 3187 */ 3188 if (dirname[0] == '-' && *dirlist == NULL && 3189 dout == NULL) 3190 retrieve(_PATH_LS " %s", dirname); 3191 else 3192 perror_reply(550, whichf); 3193 goto out; 3194 } 3195 3196 if (S_ISREG(st.st_mode)) { 3197 if (dout == NULL) { 3198 dout = dataconn("file list", -1, "w"); 3199 if (dout == NULL) 3200 goto out; 3201 STARTXFER; 3202 } 3203 START_UNSAFE; 3204 fprintf(dout, "%s%s\n", dirname, 3205 type == TYPE_A ? "\r" : ""); 3206 END_UNSAFE; 3207 if (ferror(dout)) 3208 goto data_err; 3209 byte_count += strlen(dirname) + 3210 (type == TYPE_A ? 2 : 1); 3211 CHECKOOB(goto abrt); 3212 continue; 3213 } else if (!S_ISDIR(st.st_mode)) 3214 continue; 3215 3216 if ((dirp = opendir(dirname)) == NULL) 3217 continue; 3218 3219 while ((dir = readdir(dirp)) != NULL) { 3220 char nbuf[MAXPATHLEN]; 3221 3222 CHECKOOB(goto abrt); 3223 3224 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3225 continue; 3226 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3227 dir->d_namlen == 2) 3228 continue; 3229 3230 snprintf(nbuf, sizeof(nbuf), 3231 "%s/%s", dirname, dir->d_name); 3232 3233 /* 3234 * We have to do a stat to insure it's 3235 * not a directory or special file. 3236 */ 3237 if (simple || (stat(nbuf, &st) == 0 && 3238 S_ISREG(st.st_mode))) { 3239 if (dout == NULL) { 3240 dout = dataconn("file list", -1, "w"); 3241 if (dout == NULL) 3242 goto out; 3243 STARTXFER; 3244 } 3245 START_UNSAFE; 3246 if (nbuf[0] == '.' && nbuf[1] == '/') 3247 fprintf(dout, "%s%s\n", &nbuf[2], 3248 type == TYPE_A ? "\r" : ""); 3249 else 3250 fprintf(dout, "%s%s\n", nbuf, 3251 type == TYPE_A ? "\r" : ""); 3252 END_UNSAFE; 3253 if (ferror(dout)) 3254 goto data_err; 3255 byte_count += strlen(nbuf) + 3256 (type == TYPE_A ? 2 : 1); 3257 CHECKOOB(goto abrt); 3258 } 3259 } 3260 (void) closedir(dirp); 3261 dirp = NULL; 3262 } 3263 3264 if (dout == NULL) 3265 reply(550, "No files found."); 3266 else if (ferror(dout)) 3267 data_err: perror_reply(550, "Data connection"); 3268 else 3269 reply(226, "Transfer complete."); 3270 out: 3271 if (dout) { 3272 ENDXFER; 3273 abrt: 3274 (void) fclose(dout); 3275 data = -1; 3276 pdata = -1; 3277 } 3278 if (dirp) 3279 (void) closedir(dirp); 3280 if (freeglob) { 3281 freeglob = 0; 3282 globfree(&gl); 3283 } 3284 } 3285 3286 void 3287 reapchild(int signo) 3288 { 3289 while (waitpid(-1, NULL, WNOHANG) > 0); 3290 } 3291 3292 static void 3293 appendf(char **strp, char *fmt, ...) 3294 { 3295 va_list ap; 3296 char *ostr, *p; 3297 3298 va_start(ap, fmt); 3299 vasprintf(&p, fmt, ap); 3300 va_end(ap); 3301 if (p == NULL) 3302 fatalerror("Ran out of memory."); 3303 if (*strp == NULL) 3304 *strp = p; 3305 else { 3306 ostr = *strp; 3307 asprintf(strp, "%s%s", ostr, p); 3308 if (*strp == NULL) 3309 fatalerror("Ran out of memory."); 3310 free(ostr); 3311 } 3312 } 3313 3314 static void 3315 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3316 { 3317 char *msg = NULL; 3318 char wd[MAXPATHLEN + 1]; 3319 3320 if (logging <= 1) 3321 return; 3322 3323 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3324 strcpy(wd, strerror(errno)); 3325 3326 appendf(&msg, "%s", cmd); 3327 if (file1) 3328 appendf(&msg, " %s", file1); 3329 if (file2) 3330 appendf(&msg, " %s", file2); 3331 if (cnt >= 0) 3332 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3333 appendf(&msg, " (wd: %s", wd); 3334 if (guest || dochroot) 3335 appendf(&msg, "; chrooted"); 3336 appendf(&msg, ")"); 3337 syslog(LOG_INFO, "%s", msg); 3338 free(msg); 3339 } 3340 3341 static void 3342 logxfer(char *name, off_t size, time_t start) 3343 { 3344 char buf[MAXPATHLEN + 1024]; 3345 char path[MAXPATHLEN + 1]; 3346 time_t now; 3347 3348 if (statfd >= 0) { 3349 time(&now); 3350 if (realpath(name, path) == NULL) { 3351 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3352 return; 3353 } 3354 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3355 ctime(&now)+4, ident, remotehost, 3356 path, (intmax_t)size, 3357 (long)(now - start + (now == start))); 3358 write(statfd, buf, strlen(buf)); 3359 } 3360 } 3361 3362 static char * 3363 doublequote(char *s) 3364 { 3365 int n; 3366 char *p, *s2; 3367 3368 for (p = s, n = 0; *p; p++) 3369 if (*p == '"') 3370 n++; 3371 3372 if ((s2 = malloc(p - s + n + 1)) == NULL) 3373 return (NULL); 3374 3375 for (p = s2; *s; s++, p++) { 3376 if ((*p = *s) == '"') 3377 *(++p) = '"'; 3378 } 3379 *p = '\0'; 3380 3381 return (s2); 3382 } 3383 3384 /* setup server socket for specified address family */ 3385 /* if af is PF_UNSPEC more than one socket may be returned */ 3386 /* the returned list is dynamically allocated, so caller needs to free it */ 3387 static int * 3388 socksetup(int af, char *bindname, const char *bindport) 3389 { 3390 struct addrinfo hints, *res, *r; 3391 int error, maxs, *s, *socks; 3392 const int on = 1; 3393 3394 memset(&hints, 0, sizeof(hints)); 3395 hints.ai_flags = AI_PASSIVE; 3396 hints.ai_family = af; 3397 hints.ai_socktype = SOCK_STREAM; 3398 error = getaddrinfo(bindname, bindport, &hints, &res); 3399 if (error) { 3400 syslog(LOG_ERR, "%s", gai_strerror(error)); 3401 if (error == EAI_SYSTEM) 3402 syslog(LOG_ERR, "%s", strerror(errno)); 3403 return NULL; 3404 } 3405 3406 /* Count max number of sockets we may open */ 3407 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3408 ; 3409 socks = malloc((maxs + 1) * sizeof(int)); 3410 if (!socks) { 3411 freeaddrinfo(res); 3412 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3413 return NULL; 3414 } 3415 3416 *socks = 0; /* num of sockets counter at start of array */ 3417 s = socks + 1; 3418 for (r = res; r; r = r->ai_next) { 3419 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3420 if (*s < 0) { 3421 syslog(LOG_DEBUG, "control socket: %m"); 3422 continue; 3423 } 3424 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3425 &on, sizeof(on)) < 0) 3426 syslog(LOG_WARNING, 3427 "control setsockopt (SO_REUSEADDR): %m"); 3428 if (r->ai_family == AF_INET6) { 3429 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3430 &on, sizeof(on)) < 0) 3431 syslog(LOG_WARNING, 3432 "control setsockopt (IPV6_V6ONLY): %m"); 3433 } 3434 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3435 syslog(LOG_DEBUG, "control bind: %m"); 3436 close(*s); 3437 continue; 3438 } 3439 (*socks)++; 3440 s++; 3441 } 3442 3443 if (res) 3444 freeaddrinfo(res); 3445 3446 if (*socks == 0) { 3447 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3448 free(socks); 3449 return NULL; 3450 } 3451 return(socks); 3452 } 3453