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 /* 33 * FTP server. 34 */ 35 #include <sys/param.h> 36 #include <sys/ioctl.h> 37 #include <sys/mman.h> 38 #include <sys/socket.h> 39 #include <sys/stat.h> 40 #include <sys/time.h> 41 #include <sys/wait.h> 42 43 #include <netinet/in.h> 44 #include <netinet/in_systm.h> 45 #include <netinet/ip.h> 46 #include <netinet/tcp.h> 47 48 #define FTP_NAMES 49 #include <arpa/ftp.h> 50 #include <arpa/inet.h> 51 #include <arpa/telnet.h> 52 53 #include <ctype.h> 54 #include <dirent.h> 55 #include <err.h> 56 #include <errno.h> 57 #include <fcntl.h> 58 #include <glob.h> 59 #include <limits.h> 60 #include <netdb.h> 61 #include <pwd.h> 62 #include <grp.h> 63 #include <signal.h> 64 #include <stdint.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <syslog.h> 69 #include <time.h> 70 #include <unistd.h> 71 #include <libutil.h> 72 #ifdef LOGIN_CAP 73 #include <login_cap.h> 74 #endif 75 76 #ifdef USE_PAM 77 #include <security/pam_appl.h> 78 #endif 79 80 #include "blacklist_client.h" 81 #include "pathnames.h" 82 #include "extern.h" 83 84 #include <stdarg.h> 85 86 static char version[] = "Version 6.00LS"; 87 #undef main 88 89 union sockunion ctrl_addr; 90 union sockunion data_source; 91 union sockunion data_dest; 92 union sockunion his_addr; 93 union sockunion pasv_addr; 94 95 int daemon_mode; 96 int data; 97 int dataport; 98 int hostinfo = 1; /* print host-specific info in messages */ 99 int logged_in; 100 struct passwd *pw; 101 char *homedir; 102 int ftpdebug; 103 int timeout = 900; /* timeout after 15 minutes of inactivity */ 104 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 105 int logging; 106 int restricted_data_ports = 1; 107 int paranoid = 1; /* be extra careful about security */ 108 int anon_only = 0; /* Only anonymous ftp allowed */ 109 int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 110 int guest; 111 int dochroot; 112 char *chrootdir; 113 int dowtmp = 1; 114 int stats; 115 int statfd = -1; 116 int type; 117 int form; 118 int stru; /* avoid C keyword */ 119 int mode; 120 int usedefault = 1; /* for data transfers */ 121 int pdata = -1; /* for passive mode */ 122 int readonly = 0; /* Server is in readonly mode. */ 123 int noepsv = 0; /* EPSV command is disabled. */ 124 int noretr = 0; /* RETR command is disabled. */ 125 int noguestretr = 0; /* RETR command is disabled for anon users. */ 126 int noguestmkd = 0; /* MKD command is disabled for anon users. */ 127 int noguestmod = 1; /* anon users may not modify existing files. */ 128 int use_blacklist = 0; 129 130 off_t file_size; 131 off_t byte_count; 132 #if !defined(CMASK) || CMASK == 0 133 #undef CMASK 134 #define CMASK 027 135 #endif 136 int defumask = CMASK; /* default umask value */ 137 char tmpline[7]; 138 char *hostname; 139 int epsvall = 0; 140 141 #ifdef VIRTUAL_HOSTING 142 char *ftpuser; 143 144 static struct ftphost { 145 struct ftphost *next; 146 struct addrinfo *hostinfo; 147 char *hostname; 148 char *anonuser; 149 char *statfile; 150 char *welcome; 151 char *loginmsg; 152 } *thishost, *firsthost; 153 154 #endif 155 char remotehost[NI_MAXHOST]; 156 char *ident = NULL; 157 158 static char wtmpid[20]; 159 160 #ifdef USE_PAM 161 static int auth_pam(struct passwd**, const char*); 162 pam_handle_t *pamh = NULL; 163 #endif 164 165 char *pid_file = NULL; /* means default location to pidfile(3) */ 166 167 /* 168 * Limit number of pathnames that glob can return. 169 * A limit of 0 indicates the number of pathnames is unlimited. 170 */ 171 #define MAXGLOBARGS 16384 172 # 173 174 /* 175 * Timeout intervals for retrying connections 176 * to hosts that don't accept PORT cmds. This 177 * is a kludge, but given the problems with TCP... 178 */ 179 #define SWAITMAX 90 /* wait at most 90 seconds */ 180 #define SWAITINT 5 /* interval between retries */ 181 182 int swaitmax = SWAITMAX; 183 int swaitint = SWAITINT; 184 185 #ifdef SETPROCTITLE 186 char proctitle[LINE_MAX]; /* initial part of title */ 187 #endif /* SETPROCTITLE */ 188 189 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 190 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 191 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 192 193 static volatile sig_atomic_t recvurg; 194 static int transflag; /* NB: for debugging only */ 195 196 #define STARTXFER flagxfer(1) 197 #define ENDXFER flagxfer(0) 198 199 #define START_UNSAFE maskurg(1) 200 #define END_UNSAFE maskurg(0) 201 202 /* It's OK to put an `else' clause after this macro. */ 203 #define CHECKOOB(action) \ 204 if (recvurg) { \ 205 recvurg = 0; \ 206 if (myoob()) { \ 207 ENDXFER; \ 208 action; \ 209 } \ 210 } 211 212 #ifdef VIRTUAL_HOSTING 213 static void inithosts(int); 214 static void selecthost(union sockunion *); 215 #endif 216 static void ack(char *); 217 static void sigurg(int); 218 static void maskurg(int); 219 static void flagxfer(int); 220 static int myoob(void); 221 static int checkuser(char *, char *, int, char **, int *); 222 static FILE *dataconn(char *, off_t, char *); 223 static void dolog(struct sockaddr *); 224 static void end_login(void); 225 static FILE *getdatasock(char *); 226 static int guniquefd(char *, char **); 227 static void lostconn(int); 228 static void sigquit(int); 229 static int receive_data(FILE *, FILE *); 230 static int send_data(FILE *, FILE *, size_t, off_t, int); 231 static struct passwd * 232 sgetpwnam(char *); 233 static char *sgetsave(char *); 234 static void reapchild(int); 235 static void appendf(char **, char *, ...) __printflike(2, 3); 236 static void logcmd(char *, char *, char *, off_t); 237 static void logxfer(char *, off_t, time_t); 238 static char *doublequote(char *); 239 static int *socksetup(int, char *, const char *); 240 241 int 242 main(int argc, char *argv[], char **envp) 243 { 244 socklen_t addrlen; 245 int ch, on = 1, tos, s = STDIN_FILENO; 246 char *cp, line[LINE_MAX]; 247 FILE *fd; 248 char *bindname = NULL; 249 const char *bindport = "ftp"; 250 int family = AF_UNSPEC; 251 struct sigaction sa; 252 253 tzset(); /* in case no timezone database in ~ftp */ 254 sigemptyset(&sa.sa_mask); 255 sa.sa_flags = SA_RESTART; 256 257 /* 258 * Prevent diagnostic messages from appearing on stderr. 259 * We run as a daemon or from inetd; in both cases, there's 260 * more reason in logging to syslog. 261 */ 262 (void) freopen(_PATH_DEVNULL, "w", stderr); 263 opterr = 0; 264 265 /* 266 * LOG_NDELAY sets up the logging connection immediately, 267 * necessary for anonymous ftp's that chroot and can't do it later. 268 */ 269 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 270 271 while ((ch = getopt(argc, argv, 272 "468a:ABdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 273 switch (ch) { 274 case '4': 275 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 276 break; 277 278 case '6': 279 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 280 break; 281 282 case '8': 283 assumeutf8 = 1; 284 break; 285 286 case 'a': 287 bindname = optarg; 288 break; 289 290 case 'A': 291 anon_only = 1; 292 break; 293 294 case 'B': 295 #ifdef USE_BLACKLIST 296 use_blacklist = 1; 297 #else 298 syslog(LOG_WARNING, "not compiled with USE_BLACKLIST support"); 299 #endif 300 break; 301 302 case 'd': 303 ftpdebug++; 304 break; 305 306 case 'D': 307 daemon_mode++; 308 break; 309 310 case 'E': 311 noepsv = 1; 312 break; 313 314 case 'h': 315 hostinfo = 0; 316 break; 317 318 case 'l': 319 logging++; /* > 1 == extra logging */ 320 break; 321 322 case 'm': 323 noguestmod = 0; 324 break; 325 326 case 'M': 327 noguestmkd = 1; 328 break; 329 330 case 'o': 331 noretr = 1; 332 break; 333 334 case 'O': 335 noguestretr = 1; 336 break; 337 338 case 'p': 339 pid_file = optarg; 340 break; 341 342 case 'P': 343 bindport = optarg; 344 break; 345 346 case 'r': 347 readonly = 1; 348 break; 349 350 case 'R': 351 paranoid = 0; 352 break; 353 354 case 'S': 355 stats++; 356 break; 357 358 case 't': 359 timeout = atoi(optarg); 360 if (maxtimeout < timeout) 361 maxtimeout = timeout; 362 break; 363 364 case 'T': 365 maxtimeout = atoi(optarg); 366 if (timeout > maxtimeout) 367 timeout = maxtimeout; 368 break; 369 370 case 'u': 371 { 372 long val = 0; 373 374 val = strtol(optarg, &optarg, 8); 375 if (*optarg != '\0' || val < 0) 376 syslog(LOG_WARNING, "bad value for -u"); 377 else 378 defumask = val; 379 break; 380 } 381 case 'U': 382 restricted_data_ports = 0; 383 break; 384 385 case 'v': 386 ftpdebug++; 387 break; 388 389 case 'W': 390 dowtmp = 0; 391 break; 392 393 default: 394 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 395 break; 396 } 397 } 398 399 /* handle filesize limit gracefully */ 400 sa.sa_handler = SIG_IGN; 401 (void)sigaction(SIGXFSZ, &sa, NULL); 402 403 if (daemon_mode) { 404 int *ctl_sock, fd, maxfd = -1, nfds, i; 405 fd_set defreadfds, readfds; 406 pid_t pid; 407 struct pidfh *pfh; 408 409 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) { 410 if (errno == EEXIST) { 411 syslog(LOG_ERR, "%s already running, pid %d", 412 getprogname(), (int)pid); 413 exit(1); 414 } 415 syslog(LOG_WARNING, "pidfile_open: %m"); 416 } 417 418 /* 419 * Detach from parent. 420 */ 421 if (daemon(1, 1) < 0) { 422 syslog(LOG_ERR, "failed to become a daemon"); 423 exit(1); 424 } 425 426 if (pfh != NULL && pidfile_write(pfh) == -1) 427 syslog(LOG_WARNING, "pidfile_write: %m"); 428 429 sa.sa_handler = reapchild; 430 (void)sigaction(SIGCHLD, &sa, NULL); 431 432 #ifdef VIRTUAL_HOSTING 433 inithosts(family); 434 #endif 435 436 /* 437 * Open a socket, bind it to the FTP port, and start 438 * listening. 439 */ 440 ctl_sock = socksetup(family, bindname, bindport); 441 if (ctl_sock == NULL) 442 exit(1); 443 444 FD_ZERO(&defreadfds); 445 for (i = 1; i <= *ctl_sock; i++) { 446 FD_SET(ctl_sock[i], &defreadfds); 447 if (listen(ctl_sock[i], 32) < 0) { 448 syslog(LOG_ERR, "control listen: %m"); 449 exit(1); 450 } 451 if (maxfd < ctl_sock[i]) 452 maxfd = ctl_sock[i]; 453 } 454 455 /* 456 * Loop forever accepting connection requests and forking off 457 * children to handle them. 458 */ 459 while (1) { 460 FD_COPY(&defreadfds, &readfds); 461 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 462 if (nfds <= 0) { 463 if (nfds < 0 && errno != EINTR) 464 syslog(LOG_WARNING, "select: %m"); 465 continue; 466 } 467 468 pid = -1; 469 for (i = 1; i <= *ctl_sock; i++) 470 if (FD_ISSET(ctl_sock[i], &readfds)) { 471 addrlen = sizeof(his_addr); 472 fd = accept(ctl_sock[i], 473 (struct sockaddr *)&his_addr, 474 &addrlen); 475 if (fd == -1) { 476 syslog(LOG_WARNING, 477 "accept: %m"); 478 continue; 479 } 480 switch (pid = fork()) { 481 case 0: 482 /* child */ 483 (void) dup2(fd, s); 484 (void) dup2(fd, STDOUT_FILENO); 485 (void) close(fd); 486 for (i = 1; i <= *ctl_sock; i++) 487 close(ctl_sock[i]); 488 if (pfh != NULL) 489 pidfile_close(pfh); 490 goto gotchild; 491 case -1: 492 syslog(LOG_WARNING, "fork: %m"); 493 /* FALLTHROUGH */ 494 default: 495 close(fd); 496 } 497 } 498 } 499 } else { 500 addrlen = sizeof(his_addr); 501 if (getpeername(s, (struct sockaddr *)&his_addr, &addrlen) < 0) { 502 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 503 exit(1); 504 } 505 506 #ifdef VIRTUAL_HOSTING 507 if (his_addr.su_family == AF_INET6 && 508 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 509 family = AF_INET; 510 else 511 family = his_addr.su_family; 512 inithosts(family); 513 #endif 514 } 515 516 gotchild: 517 sa.sa_handler = SIG_DFL; 518 (void)sigaction(SIGCHLD, &sa, NULL); 519 520 sa.sa_handler = sigurg; 521 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 522 (void)sigaction(SIGURG, &sa, NULL); 523 524 sigfillset(&sa.sa_mask); /* block all signals in handler */ 525 sa.sa_flags = SA_RESTART; 526 sa.sa_handler = sigquit; 527 (void)sigaction(SIGHUP, &sa, NULL); 528 (void)sigaction(SIGINT, &sa, NULL); 529 (void)sigaction(SIGQUIT, &sa, NULL); 530 (void)sigaction(SIGTERM, &sa, NULL); 531 532 sa.sa_handler = lostconn; 533 (void)sigaction(SIGPIPE, &sa, NULL); 534 535 addrlen = sizeof(ctrl_addr); 536 if (getsockname(s, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 537 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 538 exit(1); 539 } 540 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 541 #ifdef VIRTUAL_HOSTING 542 /* select our identity from virtual host table */ 543 selecthost(&ctrl_addr); 544 #endif 545 #ifdef IP_TOS 546 if (ctrl_addr.su_family == AF_INET) 547 { 548 tos = IPTOS_LOWDELAY; 549 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 550 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 551 } 552 #endif 553 /* 554 * Disable Nagle on the control channel so that we don't have to wait 555 * for peer's ACK before issuing our next reply. 556 */ 557 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 558 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 559 560 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 561 562 (void)snprintf(wtmpid, sizeof(wtmpid), "%xftpd", getpid()); 563 564 /* Try to handle urgent data inline */ 565 #ifdef SO_OOBINLINE 566 if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 567 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 568 #endif 569 570 #ifdef F_SETOWN 571 if (fcntl(s, F_SETOWN, getpid()) == -1) 572 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 573 #endif 574 dolog((struct sockaddr *)&his_addr); 575 /* 576 * Set up default state 577 */ 578 data = -1; 579 type = TYPE_A; 580 form = FORM_N; 581 stru = STRU_F; 582 mode = MODE_S; 583 tmpline[0] = '\0'; 584 585 /* If logins are disabled, print out the message. */ 586 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 587 while (fgets(line, sizeof(line), fd) != NULL) { 588 if ((cp = strchr(line, '\n')) != NULL) 589 *cp = '\0'; 590 lreply(530, "%s", line); 591 } 592 (void) fflush(stdout); 593 (void) fclose(fd); 594 reply(530, "System not available."); 595 exit(0); 596 } 597 #ifdef VIRTUAL_HOSTING 598 fd = fopen(thishost->welcome, "r"); 599 #else 600 fd = fopen(_PATH_FTPWELCOME, "r"); 601 #endif 602 if (fd != NULL) { 603 while (fgets(line, sizeof(line), fd) != NULL) { 604 if ((cp = strchr(line, '\n')) != NULL) 605 *cp = '\0'; 606 lreply(220, "%s", line); 607 } 608 (void) fflush(stdout); 609 (void) fclose(fd); 610 /* reply(220,) must follow */ 611 } 612 #ifndef VIRTUAL_HOSTING 613 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 614 fatalerror("Ran out of memory."); 615 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 616 hostname[0] = '\0'; 617 hostname[MAXHOSTNAMELEN - 1] = '\0'; 618 #endif 619 if (hostinfo) 620 reply(220, "%s FTP server (%s) ready.", hostname, version); 621 else 622 reply(220, "FTP server ready."); 623 BLACKLIST_INIT(); 624 for (;;) 625 (void) yyparse(); 626 /* NOTREACHED */ 627 } 628 629 static void 630 lostconn(int signo) 631 { 632 633 if (ftpdebug) 634 syslog(LOG_DEBUG, "lost connection"); 635 dologout(1); 636 } 637 638 static void 639 sigquit(int signo) 640 { 641 642 syslog(LOG_ERR, "got signal %d", signo); 643 dologout(1); 644 } 645 646 #ifdef VIRTUAL_HOSTING 647 /* 648 * read in virtual host tables (if they exist) 649 */ 650 651 static void 652 inithosts(int family) 653 { 654 int insert; 655 size_t len; 656 FILE *fp; 657 char *cp, *mp, *line; 658 char *hostname; 659 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 660 struct ftphost *hrp, *lhrp; 661 struct addrinfo hints, *res, *ai; 662 663 /* 664 * Fill in the default host information 665 */ 666 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 667 fatalerror("Ran out of memory."); 668 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 669 hostname[0] = '\0'; 670 hostname[MAXHOSTNAMELEN - 1] = '\0'; 671 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 672 fatalerror("Ran out of memory."); 673 hrp->hostname = hostname; 674 hrp->hostinfo = NULL; 675 676 memset(&hints, 0, sizeof(hints)); 677 hints.ai_flags = AI_PASSIVE; 678 hints.ai_family = family; 679 hints.ai_socktype = SOCK_STREAM; 680 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 681 hrp->hostinfo = res; 682 hrp->statfile = _PATH_FTPDSTATFILE; 683 hrp->welcome = _PATH_FTPWELCOME; 684 hrp->loginmsg = _PATH_FTPLOGINMESG; 685 hrp->anonuser = "ftp"; 686 hrp->next = NULL; 687 thishost = firsthost = lhrp = hrp; 688 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 689 int addrsize, gothost; 690 void *addr; 691 struct hostent *hp; 692 693 while ((line = fgetln(fp, &len)) != NULL) { 694 int i, hp_error; 695 696 /* skip comments */ 697 if (line[0] == '#') 698 continue; 699 if (line[len - 1] == '\n') { 700 line[len - 1] = '\0'; 701 mp = NULL; 702 } else { 703 if ((mp = malloc(len + 1)) == NULL) 704 fatalerror("Ran out of memory."); 705 memcpy(mp, line, len); 706 mp[len] = '\0'; 707 line = mp; 708 } 709 cp = strtok(line, " \t"); 710 /* skip empty lines */ 711 if (cp == NULL) 712 goto nextline; 713 vhost = cp; 714 715 /* set defaults */ 716 anonuser = "ftp"; 717 statfile = _PATH_FTPDSTATFILE; 718 welcome = _PATH_FTPWELCOME; 719 loginmsg = _PATH_FTPLOGINMESG; 720 721 /* 722 * Preparse the line so we can use its info 723 * for all the addresses associated with 724 * the virtual host name. 725 * Field 0, the virtual host name, is special: 726 * it's already parsed off and will be strdup'ed 727 * later, after we know its canonical form. 728 */ 729 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 730 if (*cp != '-' && (cp = strdup(cp))) 731 switch (i) { 732 case 1: /* anon user permissions */ 733 anonuser = cp; 734 break; 735 case 2: /* statistics file */ 736 statfile = cp; 737 break; 738 case 3: /* welcome message */ 739 welcome = cp; 740 break; 741 case 4: /* login message */ 742 loginmsg = cp; 743 break; 744 default: /* programming error */ 745 abort(); 746 /* NOTREACHED */ 747 } 748 749 hints.ai_flags = AI_PASSIVE; 750 hints.ai_family = family; 751 hints.ai_socktype = SOCK_STREAM; 752 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 753 goto nextline; 754 for (ai = res; ai != NULL && ai->ai_addr != NULL; 755 ai = ai->ai_next) { 756 757 gothost = 0; 758 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 759 struct addrinfo *hi; 760 761 for (hi = hrp->hostinfo; hi != NULL; 762 hi = hi->ai_next) 763 if (hi->ai_addrlen == ai->ai_addrlen && 764 memcmp(hi->ai_addr, 765 ai->ai_addr, 766 ai->ai_addr->sa_len) == 0) { 767 gothost++; 768 break; 769 } 770 if (gothost) 771 break; 772 } 773 if (hrp == NULL) { 774 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 775 goto nextline; 776 hrp->hostname = NULL; 777 insert = 1; 778 } else { 779 if (hrp->hostinfo && hrp->hostinfo != res) 780 freeaddrinfo(hrp->hostinfo); 781 insert = 0; /* host already in the chain */ 782 } 783 hrp->hostinfo = res; 784 785 /* 786 * determine hostname to use. 787 * force defined name if there is a valid alias 788 * otherwise fallback to primary hostname 789 */ 790 /* XXX: getaddrinfo() can't do alias check */ 791 switch(hrp->hostinfo->ai_family) { 792 case AF_INET: 793 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 794 addrsize = sizeof(struct in_addr); 795 break; 796 case AF_INET6: 797 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 798 addrsize = sizeof(struct in6_addr); 799 break; 800 default: 801 /* should not reach here */ 802 freeaddrinfo(hrp->hostinfo); 803 if (insert) 804 free(hrp); /*not in chain, can free*/ 805 else 806 hrp->hostinfo = NULL; /*mark as blank*/ 807 goto nextline; 808 /* NOTREACHED */ 809 } 810 if ((hp = getipnodebyaddr(addr, addrsize, 811 hrp->hostinfo->ai_family, 812 &hp_error)) != NULL) { 813 if (strcmp(vhost, hp->h_name) != 0) { 814 if (hp->h_aliases == NULL) 815 vhost = hp->h_name; 816 else { 817 i = 0; 818 while (hp->h_aliases[i] && 819 strcmp(vhost, hp->h_aliases[i]) != 0) 820 ++i; 821 if (hp->h_aliases[i] == NULL) 822 vhost = hp->h_name; 823 } 824 } 825 } 826 if (hrp->hostname && 827 strcmp(hrp->hostname, vhost) != 0) { 828 free(hrp->hostname); 829 hrp->hostname = NULL; 830 } 831 if (hrp->hostname == NULL && 832 (hrp->hostname = strdup(vhost)) == NULL) { 833 freeaddrinfo(hrp->hostinfo); 834 hrp->hostinfo = NULL; /* mark as blank */ 835 if (hp) 836 freehostent(hp); 837 goto nextline; 838 } 839 hrp->anonuser = anonuser; 840 hrp->statfile = statfile; 841 hrp->welcome = welcome; 842 hrp->loginmsg = loginmsg; 843 if (insert) { 844 hrp->next = NULL; 845 lhrp->next = hrp; 846 lhrp = hrp; 847 } 848 if (hp) 849 freehostent(hp); 850 } 851 nextline: 852 if (mp) 853 free(mp); 854 } 855 (void) fclose(fp); 856 } 857 } 858 859 static void 860 selecthost(union sockunion *su) 861 { 862 struct ftphost *hrp; 863 u_int16_t port; 864 #ifdef INET6 865 struct in6_addr *mapped_in6 = NULL; 866 #endif 867 struct addrinfo *hi; 868 869 #ifdef INET6 870 /* 871 * XXX IPv4 mapped IPv6 addr consideraton, 872 * specified in rfc2373. 873 */ 874 if (su->su_family == AF_INET6 && 875 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 876 mapped_in6 = &su->su_sin6.sin6_addr; 877 #endif 878 879 hrp = thishost = firsthost; /* default */ 880 port = su->su_port; 881 su->su_port = 0; 882 while (hrp != NULL) { 883 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 884 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 885 thishost = hrp; 886 goto found; 887 } 888 #ifdef INET6 889 /* XXX IPv4 mapped IPv6 addr consideraton */ 890 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 891 (memcmp(&mapped_in6->s6_addr[12], 892 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 893 sizeof(struct in_addr)) == 0)) { 894 thishost = hrp; 895 goto found; 896 } 897 #endif 898 } 899 hrp = hrp->next; 900 } 901 found: 902 su->su_port = port; 903 /* setup static variables as appropriate */ 904 hostname = thishost->hostname; 905 ftpuser = thishost->anonuser; 906 } 907 #endif 908 909 /* 910 * Helper function for sgetpwnam(). 911 */ 912 static char * 913 sgetsave(char *s) 914 { 915 char *new = malloc(strlen(s) + 1); 916 917 if (new == NULL) { 918 reply(421, "Ran out of memory."); 919 dologout(1); 920 /* NOTREACHED */ 921 } 922 (void) strcpy(new, s); 923 return (new); 924 } 925 926 /* 927 * Save the result of a getpwnam. Used for USER command, since 928 * the data returned must not be clobbered by any other command 929 * (e.g., globbing). 930 * NB: The data returned by sgetpwnam() will remain valid until 931 * the next call to this function. Its difference from getpwnam() 932 * is that sgetpwnam() is known to be called from ftpd code only. 933 */ 934 static struct passwd * 935 sgetpwnam(char *name) 936 { 937 static struct passwd save; 938 struct passwd *p; 939 940 if ((p = getpwnam(name)) == NULL) 941 return (p); 942 if (save.pw_name) { 943 free(save.pw_name); 944 free(save.pw_passwd); 945 free(save.pw_class); 946 free(save.pw_gecos); 947 free(save.pw_dir); 948 free(save.pw_shell); 949 } 950 save = *p; 951 save.pw_name = sgetsave(p->pw_name); 952 save.pw_passwd = sgetsave(p->pw_passwd); 953 save.pw_class = sgetsave(p->pw_class); 954 save.pw_gecos = sgetsave(p->pw_gecos); 955 save.pw_dir = sgetsave(p->pw_dir); 956 save.pw_shell = sgetsave(p->pw_shell); 957 return (&save); 958 } 959 960 static int login_attempts; /* number of failed login attempts */ 961 static int askpasswd; /* had user command, ask for passwd */ 962 static char curname[MAXLOGNAME]; /* current USER name */ 963 964 /* 965 * USER command. 966 * Sets global passwd pointer pw if named account exists and is acceptable; 967 * sets askpasswd if a PASS command is expected. If logged in previously, 968 * need to reset state. If name is "ftp" or "anonymous", the name is not in 969 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 970 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 971 * requesting login privileges. Disallow anyone who does not have a standard 972 * shell as returned by getusershell(). Disallow anyone mentioned in the file 973 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 974 */ 975 void 976 user(char *name) 977 { 978 int ecode; 979 char *cp, *shell; 980 981 if (logged_in) { 982 if (guest) { 983 reply(530, "Can't change user from guest login."); 984 return; 985 } else if (dochroot) { 986 reply(530, "Can't change user from chroot user."); 987 return; 988 } 989 end_login(); 990 } 991 992 guest = 0; 993 #ifdef VIRTUAL_HOSTING 994 pw = sgetpwnam(thishost->anonuser); 995 #else 996 pw = sgetpwnam("ftp"); 997 #endif 998 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 999 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL, &ecode) || 1000 (ecode != 0 && ecode != ENOENT)) 1001 reply(530, "User %s access denied.", name); 1002 else if (checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL, &ecode) || 1003 (ecode != 0 && ecode != ENOENT)) 1004 reply(530, "User %s access denied.", name); 1005 else if (pw != NULL) { 1006 guest = 1; 1007 askpasswd = 1; 1008 reply(331, 1009 "Guest login ok, send your email address as password."); 1010 } else 1011 reply(530, "User %s unknown.", name); 1012 if (!askpasswd && logging) 1013 syslog(LOG_NOTICE, 1014 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1015 return; 1016 } 1017 if (anon_only != 0) { 1018 reply(530, "Sorry, only anonymous ftp allowed."); 1019 return; 1020 } 1021 1022 if ((pw = sgetpwnam(name))) { 1023 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1024 shell = _PATH_BSHELL; 1025 setusershell(); 1026 while ((cp = getusershell()) != NULL) 1027 if (strcmp(cp, shell) == 0) 1028 break; 1029 endusershell(); 1030 1031 if (cp == NULL || 1032 (checkuser(_PATH_FTPUSERS, name, 1, NULL, &ecode) || 1033 (ecode != 0 && ecode != ENOENT))) { 1034 reply(530, "User %s access denied.", name); 1035 if (logging) 1036 syslog(LOG_NOTICE, 1037 "FTP LOGIN REFUSED FROM %s, %s", 1038 remotehost, name); 1039 pw = NULL; 1040 return; 1041 } 1042 } 1043 if (logging) 1044 strlcpy(curname, name, sizeof(curname)); 1045 1046 reply(331, "Password required for %s.", name); 1047 askpasswd = 1; 1048 /* 1049 * Delay before reading passwd after first failed 1050 * attempt to slow down passwd-guessing programs. 1051 */ 1052 if (login_attempts) 1053 sleep(login_attempts); 1054 } 1055 1056 /* 1057 * Check if a user is in the file "fname", 1058 * return a pointer to a malloc'd string with the rest 1059 * of the matching line in "residue" if not NULL. 1060 */ 1061 static int 1062 checkuser(char *fname, char *name, int pwset, char **residue, int *ecode) 1063 { 1064 FILE *fd; 1065 int found = 0; 1066 size_t len; 1067 char *line, *mp, *p; 1068 1069 if (ecode != NULL) 1070 *ecode = 0; 1071 if ((fd = fopen(fname, "r")) != NULL) { 1072 while (!found && (line = fgetln(fd, &len)) != NULL) { 1073 /* skip comments */ 1074 if (line[0] == '#') 1075 continue; 1076 if (line[len - 1] == '\n') { 1077 line[len - 1] = '\0'; 1078 mp = NULL; 1079 } else { 1080 if ((mp = malloc(len + 1)) == NULL) 1081 fatalerror("Ran out of memory."); 1082 memcpy(mp, line, len); 1083 mp[len] = '\0'; 1084 line = mp; 1085 } 1086 /* avoid possible leading and trailing whitespace */ 1087 p = strtok(line, " \t"); 1088 /* skip empty lines */ 1089 if (p == NULL) 1090 goto nextline; 1091 /* 1092 * if first chr is '@', check group membership 1093 */ 1094 if (p[0] == '@') { 1095 int i = 0; 1096 struct group *grp; 1097 1098 if (p[1] == '\0') /* single @ matches anyone */ 1099 found = 1; 1100 else { 1101 if ((grp = getgrnam(p+1)) == NULL) 1102 goto nextline; 1103 /* 1104 * Check user's default group 1105 */ 1106 if (pwset && grp->gr_gid == pw->pw_gid) 1107 found = 1; 1108 /* 1109 * Check supplementary groups 1110 */ 1111 while (!found && grp->gr_mem[i]) 1112 found = strcmp(name, 1113 grp->gr_mem[i++]) 1114 == 0; 1115 } 1116 } 1117 /* 1118 * Otherwise, just check for username match 1119 */ 1120 else 1121 found = strcmp(p, name) == 0; 1122 /* 1123 * Save the rest of line to "residue" if matched 1124 */ 1125 if (found && residue) { 1126 if ((p = strtok(NULL, "")) != NULL) 1127 p += strspn(p, " \t"); 1128 if (p && *p) { 1129 if ((*residue = strdup(p)) == NULL) 1130 fatalerror("Ran out of memory."); 1131 } else 1132 *residue = NULL; 1133 } 1134 nextline: 1135 if (mp) 1136 free(mp); 1137 } 1138 (void) fclose(fd); 1139 } else if (ecode != NULL) 1140 *ecode = errno; 1141 return (found); 1142 } 1143 1144 /* 1145 * Terminate login as previous user, if any, resetting state; 1146 * used when USER command is given or login fails. 1147 */ 1148 static void 1149 end_login(void) 1150 { 1151 #ifdef USE_PAM 1152 int e; 1153 #endif 1154 1155 (void) seteuid(0); 1156 #ifdef LOGIN_CAP 1157 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 1158 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 1159 LOGIN_SETENV)); 1160 #endif 1161 if (logged_in && dowtmp) 1162 ftpd_logwtmp(wtmpid, NULL, NULL); 1163 pw = NULL; 1164 #ifdef USE_PAM 1165 if (pamh) { 1166 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1167 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1168 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1169 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1170 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1171 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1172 pamh = NULL; 1173 } 1174 #endif 1175 logged_in = 0; 1176 guest = 0; 1177 dochroot = 0; 1178 } 1179 1180 #ifdef USE_PAM 1181 1182 /* 1183 * the following code is stolen from imap-uw PAM authentication module and 1184 * login.c 1185 */ 1186 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1187 1188 struct cred_t { 1189 const char *uname; /* user name */ 1190 const char *pass; /* password */ 1191 }; 1192 typedef struct cred_t cred_t; 1193 1194 static int 1195 auth_conv(int num_msg, const struct pam_message **msg, 1196 struct pam_response **resp, void *appdata) 1197 { 1198 int i; 1199 cred_t *cred = (cred_t *) appdata; 1200 struct pam_response *reply; 1201 1202 reply = calloc(num_msg, sizeof *reply); 1203 if (reply == NULL) 1204 return PAM_BUF_ERR; 1205 1206 for (i = 0; i < num_msg; i++) { 1207 switch (msg[i]->msg_style) { 1208 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1209 reply[i].resp_retcode = PAM_SUCCESS; 1210 reply[i].resp = COPY_STRING(cred->uname); 1211 /* PAM frees resp. */ 1212 break; 1213 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1214 reply[i].resp_retcode = PAM_SUCCESS; 1215 reply[i].resp = COPY_STRING(cred->pass); 1216 /* PAM frees resp. */ 1217 break; 1218 case PAM_TEXT_INFO: 1219 case PAM_ERROR_MSG: 1220 reply[i].resp_retcode = PAM_SUCCESS; 1221 reply[i].resp = NULL; 1222 break; 1223 default: /* unknown message style */ 1224 free(reply); 1225 return PAM_CONV_ERR; 1226 } 1227 } 1228 1229 *resp = reply; 1230 return PAM_SUCCESS; 1231 } 1232 1233 /* 1234 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1235 * authenticated, or 1 if not authenticated. If some sort of PAM system 1236 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1237 * function returns -1. This can be used as an indication that we should 1238 * fall back to a different authentication mechanism. 1239 */ 1240 static int 1241 auth_pam(struct passwd **ppw, const char *pass) 1242 { 1243 const char *tmpl_user; 1244 const void *item; 1245 int rval; 1246 int e; 1247 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1248 struct pam_conv conv = { &auth_conv, &auth_cred }; 1249 1250 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1251 if (e != PAM_SUCCESS) { 1252 /* 1253 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1254 * if context creation has failed in the first place. 1255 */ 1256 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1257 return -1; 1258 } 1259 1260 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1261 if (e != PAM_SUCCESS) { 1262 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1263 pam_strerror(pamh, e)); 1264 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1265 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1266 } 1267 pamh = NULL; 1268 return -1; 1269 } 1270 1271 e = pam_authenticate(pamh, 0); 1272 switch (e) { 1273 case PAM_SUCCESS: 1274 /* 1275 * With PAM we support the concept of a "template" 1276 * user. The user enters a login name which is 1277 * authenticated by PAM, usually via a remote service 1278 * such as RADIUS or TACACS+. If authentication 1279 * succeeds, a different but related "template" name 1280 * is used for setting the credentials, shell, and 1281 * home directory. The name the user enters need only 1282 * exist on the remote authentication server, but the 1283 * template name must be present in the local password 1284 * database. 1285 * 1286 * This is supported by two various mechanisms in the 1287 * individual modules. However, from the application's 1288 * point of view, the template user is always passed 1289 * back as a changed value of the PAM_USER item. 1290 */ 1291 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1292 PAM_SUCCESS) { 1293 tmpl_user = (const char *) item; 1294 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1295 *ppw = getpwnam(tmpl_user); 1296 } else 1297 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1298 pam_strerror(pamh, e)); 1299 rval = 0; 1300 break; 1301 1302 case PAM_AUTH_ERR: 1303 case PAM_USER_UNKNOWN: 1304 case PAM_MAXTRIES: 1305 rval = 1; 1306 break; 1307 1308 default: 1309 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1310 rval = -1; 1311 break; 1312 } 1313 1314 if (rval == 0) { 1315 e = pam_acct_mgmt(pamh, 0); 1316 if (e != PAM_SUCCESS) { 1317 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1318 pam_strerror(pamh, e)); 1319 rval = 1; 1320 } 1321 } 1322 1323 if (rval != 0) { 1324 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1325 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1326 } 1327 pamh = NULL; 1328 } 1329 return rval; 1330 } 1331 1332 #endif /* USE_PAM */ 1333 1334 void 1335 pass(char *passwd) 1336 { 1337 int rval, ecode; 1338 FILE *fd; 1339 #ifdef LOGIN_CAP 1340 login_cap_t *lc = NULL; 1341 #endif 1342 #ifdef USE_PAM 1343 int e; 1344 #endif 1345 char *residue = NULL; 1346 char *xpasswd; 1347 1348 if (logged_in || askpasswd == 0) { 1349 reply(503, "Login with USER first."); 1350 return; 1351 } 1352 askpasswd = 0; 1353 if (!guest) { /* "ftp" is only account allowed no password */ 1354 if (pw == NULL) { 1355 rval = 1; /* failure below */ 1356 goto skip; 1357 } 1358 #ifdef USE_PAM 1359 rval = auth_pam(&pw, passwd); 1360 if (rval >= 0) { 1361 goto skip; 1362 } 1363 #endif 1364 xpasswd = crypt(passwd, pw->pw_passwd); 1365 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1366 xpasswd = ":"; 1367 rval = strcmp(pw->pw_passwd, xpasswd); 1368 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1369 rval = 1; /* failure */ 1370 skip: 1371 /* 1372 * If rval == 1, the user failed the authentication check 1373 * above. If rval == 0, either PAM or local authentication 1374 * succeeded. 1375 */ 1376 if (rval) { 1377 reply(530, "Login incorrect."); 1378 BLACKLIST_NOTIFY(BLACKLIST_AUTH_FAIL, STDIN_FILENO, "Login incorrect"); 1379 if (logging) { 1380 syslog(LOG_NOTICE, 1381 "FTP LOGIN FAILED FROM %s", 1382 remotehost); 1383 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1384 "FTP LOGIN FAILED FROM %s, %s", 1385 remotehost, curname); 1386 } 1387 pw = NULL; 1388 if (login_attempts++ >= 5) { 1389 syslog(LOG_NOTICE, 1390 "repeated login failures from %s", 1391 remotehost); 1392 exit(0); 1393 } 1394 return; 1395 } else { 1396 BLACKLIST_NOTIFY(BLACKLIST_AUTH_OK, STDIN_FILENO, "Login successful"); 1397 } 1398 } 1399 login_attempts = 0; /* this time successful */ 1400 if (setegid(pw->pw_gid) < 0) { 1401 reply(550, "Can't set gid."); 1402 return; 1403 } 1404 /* May be overridden by login.conf */ 1405 (void) umask(defumask); 1406 #ifdef LOGIN_CAP 1407 if ((lc = login_getpwclass(pw)) != NULL) { 1408 char remote_ip[NI_MAXHOST]; 1409 1410 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1411 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1412 NI_NUMERICHOST)) 1413 *remote_ip = 0; 1414 remote_ip[sizeof(remote_ip) - 1] = 0; 1415 if (!auth_hostok(lc, remotehost, remote_ip)) { 1416 syslog(LOG_INFO|LOG_AUTH, 1417 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1418 pw->pw_name); 1419 reply(530, "Permission denied."); 1420 pw = NULL; 1421 return; 1422 } 1423 if (!auth_timeok(lc, time(NULL))) { 1424 reply(530, "Login not available right now."); 1425 pw = NULL; 1426 return; 1427 } 1428 } 1429 setusercontext(lc, pw, 0, LOGIN_SETALL & 1430 ~(LOGIN_SETRESOURCES | LOGIN_SETUSER | LOGIN_SETPATH | LOGIN_SETENV)); 1431 #else 1432 setlogin(pw->pw_name); 1433 (void) initgroups(pw->pw_name, pw->pw_gid); 1434 #endif 1435 1436 #ifdef USE_PAM 1437 if (pamh) { 1438 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1439 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1440 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1441 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1442 } 1443 } 1444 #endif 1445 1446 dochroot = 1447 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue, &ecode) 1448 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1449 || login_getcapbool(lc, "ftp-chroot", 0) 1450 #endif 1451 ; 1452 /* 1453 * It is possible that checkuser() failed to open the chroot file. 1454 * If this is the case, report that logins are un-available, since we 1455 * have no way of checking whether or not the user should be chrooted. 1456 * We ignore ENOENT since it is not required that this file be present. 1457 */ 1458 if (ecode != 0 && ecode != ENOENT) { 1459 reply(530, "Login not available right now."); 1460 return; 1461 } 1462 chrootdir = NULL; 1463 1464 /* Disable wtmp logging when chrooting. */ 1465 if (dochroot || guest) 1466 dowtmp = 0; 1467 if (dowtmp) 1468 ftpd_logwtmp(wtmpid, pw->pw_name, 1469 (struct sockaddr *)&his_addr); 1470 logged_in = 1; 1471 1472 #ifdef LOGIN_CAP 1473 setusercontext(lc, pw, 0, LOGIN_SETRESOURCES); 1474 #endif 1475 1476 if (guest && stats && statfd < 0) { 1477 #ifdef VIRTUAL_HOSTING 1478 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1479 #else 1480 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1481 #endif 1482 if (statfd < 0) 1483 stats = 0; 1484 } 1485 1486 /* 1487 * For a chrooted local user, 1488 * a) see whether ftpchroot(5) specifies a chroot directory, 1489 * b) extract the directory pathname from the line, 1490 * c) expand it to the absolute pathname if necessary. 1491 */ 1492 if (dochroot && residue && 1493 (chrootdir = strtok(residue, " \t")) != NULL) { 1494 if (chrootdir[0] != '/') 1495 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1496 else 1497 chrootdir = strdup(chrootdir); /* make it permanent */ 1498 if (chrootdir == NULL) 1499 fatalerror("Ran out of memory."); 1500 } 1501 if (guest || dochroot) { 1502 /* 1503 * If no chroot directory set yet, use the login directory. 1504 * Copy it so it can be modified while pw->pw_dir stays intact. 1505 */ 1506 if (chrootdir == NULL && 1507 (chrootdir = strdup(pw->pw_dir)) == NULL) 1508 fatalerror("Ran out of memory."); 1509 /* 1510 * Check for the "/chroot/./home" syntax, 1511 * separate the chroot and home directory pathnames. 1512 */ 1513 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1514 *(homedir++) = '\0'; /* wipe '/' */ 1515 homedir++; /* skip '.' */ 1516 } else { 1517 /* 1518 * We MUST do a chdir() after the chroot. Otherwise 1519 * the old current directory will be accessible as "." 1520 * outside the new root! 1521 */ 1522 homedir = "/"; 1523 } 1524 /* 1525 * Finally, do chroot() 1526 */ 1527 if (chroot(chrootdir) < 0) { 1528 reply(550, "Can't change root."); 1529 goto bad; 1530 } 1531 __FreeBSD_libc_enter_restricted_mode(); 1532 } else /* real user w/o chroot */ 1533 homedir = pw->pw_dir; 1534 /* 1535 * Set euid *before* doing chdir() so 1536 * a) the user won't be carried to a directory that he couldn't reach 1537 * on his own due to no permission to upper path components, 1538 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1539 * (uid 0 has no root power over NFS if not mapped explicitly.) 1540 */ 1541 if (seteuid(pw->pw_uid) < 0) { 1542 if (guest || dochroot) { 1543 fatalerror("Can't set uid."); 1544 } else { 1545 reply(550, "Can't set uid."); 1546 goto bad; 1547 } 1548 } 1549 /* 1550 * Do not allow the session to live if we're chroot()'ed and chdir() 1551 * fails. Otherwise the chroot jail can be escaped. 1552 */ 1553 if (chdir(homedir) < 0) { 1554 if (guest || dochroot) { 1555 fatalerror("Can't change to base directory."); 1556 } else { 1557 if (chdir("/") < 0) { 1558 reply(550, "Root is inaccessible."); 1559 goto bad; 1560 } 1561 lreply(230, "No directory! Logging in with home=/."); 1562 } 1563 } 1564 1565 /* 1566 * Display a login message, if it exists. 1567 * N.B. reply(230,) must follow the message. 1568 */ 1569 #ifdef VIRTUAL_HOSTING 1570 fd = fopen(thishost->loginmsg, "r"); 1571 #else 1572 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1573 #endif 1574 if (fd != NULL) { 1575 char *cp, line[LINE_MAX]; 1576 1577 while (fgets(line, sizeof(line), fd) != NULL) { 1578 if ((cp = strchr(line, '\n')) != NULL) 1579 *cp = '\0'; 1580 lreply(230, "%s", line); 1581 } 1582 (void) fflush(stdout); 1583 (void) fclose(fd); 1584 } 1585 if (guest) { 1586 if (ident != NULL) 1587 free(ident); 1588 ident = strdup(passwd); 1589 if (ident == NULL) 1590 fatalerror("Ran out of memory."); 1591 1592 reply(230, "Guest login ok, access restrictions apply."); 1593 #ifdef SETPROCTITLE 1594 #ifdef VIRTUAL_HOSTING 1595 if (thishost != firsthost) 1596 snprintf(proctitle, sizeof(proctitle), 1597 "%s: anonymous(%s)/%s", remotehost, hostname, 1598 passwd); 1599 else 1600 #endif 1601 snprintf(proctitle, sizeof(proctitle), 1602 "%s: anonymous/%s", remotehost, passwd); 1603 setproctitle("%s", proctitle); 1604 #endif /* SETPROCTITLE */ 1605 if (logging) 1606 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1607 remotehost, passwd); 1608 } else { 1609 if (dochroot) 1610 reply(230, "User %s logged in, " 1611 "access restrictions apply.", pw->pw_name); 1612 else 1613 reply(230, "User %s logged in.", pw->pw_name); 1614 1615 #ifdef SETPROCTITLE 1616 snprintf(proctitle, sizeof(proctitle), 1617 "%s: user/%s", remotehost, pw->pw_name); 1618 setproctitle("%s", proctitle); 1619 #endif /* SETPROCTITLE */ 1620 if (logging) 1621 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1622 remotehost, pw->pw_name); 1623 } 1624 if (logging && (guest || dochroot)) 1625 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1626 #ifdef LOGIN_CAP 1627 login_close(lc); 1628 #endif 1629 if (residue) 1630 free(residue); 1631 return; 1632 bad: 1633 /* Forget all about it... */ 1634 #ifdef LOGIN_CAP 1635 login_close(lc); 1636 #endif 1637 if (residue) 1638 free(residue); 1639 end_login(); 1640 } 1641 1642 void 1643 retrieve(char *cmd, char *name) 1644 { 1645 FILE *fin, *dout; 1646 struct stat st; 1647 int (*closefunc)(FILE *); 1648 time_t start; 1649 char line[BUFSIZ]; 1650 1651 if (cmd == 0) { 1652 fin = fopen(name, "r"), closefunc = fclose; 1653 st.st_size = 0; 1654 } else { 1655 (void) snprintf(line, sizeof(line), cmd, name); 1656 name = line; 1657 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1658 st.st_size = -1; 1659 st.st_blksize = BUFSIZ; 1660 } 1661 if (fin == NULL) { 1662 if (errno != 0) { 1663 perror_reply(550, name); 1664 if (cmd == 0) { 1665 LOGCMD("get", name); 1666 } 1667 } 1668 return; 1669 } 1670 byte_count = -1; 1671 if (cmd == 0) { 1672 if (fstat(fileno(fin), &st) < 0) { 1673 perror_reply(550, name); 1674 goto done; 1675 } 1676 if (!S_ISREG(st.st_mode)) { 1677 /* 1678 * Never sending a raw directory is a workaround 1679 * for buggy clients that will attempt to RETR 1680 * a directory before listing it, e.g., Mozilla. 1681 * Preventing a guest from getting irregular files 1682 * is a simple security measure. 1683 */ 1684 if (S_ISDIR(st.st_mode) || guest) { 1685 reply(550, "%s: not a plain file.", name); 1686 goto done; 1687 } 1688 st.st_size = -1; 1689 /* st.st_blksize is set for all descriptor types */ 1690 } 1691 } 1692 if (restart_point) { 1693 if (type == TYPE_A) { 1694 off_t i, n; 1695 int c; 1696 1697 n = restart_point; 1698 i = 0; 1699 while (i++ < n) { 1700 if ((c=getc(fin)) == EOF) { 1701 perror_reply(550, name); 1702 goto done; 1703 } 1704 if (c == '\n') 1705 i++; 1706 } 1707 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1708 perror_reply(550, name); 1709 goto done; 1710 } 1711 } 1712 dout = dataconn(name, st.st_size, "w"); 1713 if (dout == NULL) 1714 goto done; 1715 time(&start); 1716 send_data(fin, dout, st.st_blksize, st.st_size, 1717 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1718 if (cmd == 0 && guest && stats && byte_count > 0) 1719 logxfer(name, byte_count, start); 1720 (void) fclose(dout); 1721 data = -1; 1722 pdata = -1; 1723 done: 1724 if (cmd == 0) 1725 LOGBYTES("get", name, byte_count); 1726 (*closefunc)(fin); 1727 } 1728 1729 void 1730 store(char *name, char *mode, int unique) 1731 { 1732 int fd; 1733 FILE *fout, *din; 1734 int (*closefunc)(FILE *); 1735 1736 if (*mode == 'a') { /* APPE */ 1737 if (unique) { 1738 /* Programming error */ 1739 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1740 unique = 0; 1741 } 1742 if (guest && noguestmod) { 1743 reply(550, "Appending to existing file denied."); 1744 goto err; 1745 } 1746 restart_point = 0; /* not affected by preceding REST */ 1747 } 1748 if (unique) /* STOU overrides REST */ 1749 restart_point = 0; 1750 if (guest && noguestmod) { 1751 if (restart_point) { /* guest STOR w/REST */ 1752 reply(550, "Modifying existing file denied."); 1753 goto err; 1754 } else /* treat guest STOR as STOU */ 1755 unique = 1; 1756 } 1757 1758 if (restart_point) 1759 mode = "r+"; /* so ASCII manual seek can work */ 1760 if (unique) { 1761 if ((fd = guniquefd(name, &name)) < 0) 1762 goto err; 1763 fout = fdopen(fd, mode); 1764 } else 1765 fout = fopen(name, mode); 1766 closefunc = fclose; 1767 if (fout == NULL) { 1768 perror_reply(553, name); 1769 goto err; 1770 } 1771 byte_count = -1; 1772 if (restart_point) { 1773 if (type == TYPE_A) { 1774 off_t i, n; 1775 int c; 1776 1777 n = restart_point; 1778 i = 0; 1779 while (i++ < n) { 1780 if ((c=getc(fout)) == EOF) { 1781 perror_reply(550, name); 1782 goto done; 1783 } 1784 if (c == '\n') 1785 i++; 1786 } 1787 /* 1788 * We must do this seek to "current" position 1789 * because we are changing from reading to 1790 * writing. 1791 */ 1792 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1793 perror_reply(550, name); 1794 goto done; 1795 } 1796 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1797 perror_reply(550, name); 1798 goto done; 1799 } 1800 } 1801 din = dataconn(name, -1, "r"); 1802 if (din == NULL) 1803 goto done; 1804 if (receive_data(din, fout) == 0) { 1805 if (unique) 1806 reply(226, "Transfer complete (unique file name:%s).", 1807 name); 1808 else 1809 reply(226, "Transfer complete."); 1810 } 1811 (void) fclose(din); 1812 data = -1; 1813 pdata = -1; 1814 done: 1815 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1816 (*closefunc)(fout); 1817 return; 1818 err: 1819 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1820 return; 1821 } 1822 1823 static FILE * 1824 getdatasock(char *mode) 1825 { 1826 int on = 1, s, t, tries; 1827 1828 if (data >= 0) 1829 return (fdopen(data, mode)); 1830 1831 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1832 if (s < 0) 1833 goto bad; 1834 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1835 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1836 /* anchor socket to avoid multi-homing problems */ 1837 data_source = ctrl_addr; 1838 data_source.su_port = htons(dataport); 1839 (void) seteuid(0); 1840 for (tries = 1; ; tries++) { 1841 /* 1842 * We should loop here since it's possible that 1843 * another ftpd instance has passed this point and is 1844 * trying to open a data connection in active mode now. 1845 * Until the other connection is opened, we'll be getting 1846 * EADDRINUSE because no SOCK_STREAM sockets in the system 1847 * can share both local and remote addresses, localIP:20 1848 * and *:* in this case. 1849 */ 1850 if (bind(s, (struct sockaddr *)&data_source, 1851 data_source.su_len) >= 0) 1852 break; 1853 if (errno != EADDRINUSE || tries > 10) 1854 goto bad; 1855 sleep(tries); 1856 } 1857 (void) seteuid(pw->pw_uid); 1858 #ifdef IP_TOS 1859 if (data_source.su_family == AF_INET) 1860 { 1861 on = IPTOS_THROUGHPUT; 1862 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1863 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1864 } 1865 #endif 1866 #ifdef TCP_NOPUSH 1867 /* 1868 * Turn off push flag to keep sender TCP from sending short packets 1869 * at the boundaries of each write(). 1870 */ 1871 on = 1; 1872 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1873 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1874 #endif 1875 return (fdopen(s, mode)); 1876 bad: 1877 /* Return the real value of errno (close may change it) */ 1878 t = errno; 1879 (void) seteuid(pw->pw_uid); 1880 (void) close(s); 1881 errno = t; 1882 return (NULL); 1883 } 1884 1885 static FILE * 1886 dataconn(char *name, off_t size, char *mode) 1887 { 1888 char sizebuf[32]; 1889 FILE *file; 1890 int retry = 0, tos, conerrno; 1891 1892 file_size = size; 1893 byte_count = 0; 1894 if (size != -1) 1895 (void) snprintf(sizebuf, sizeof(sizebuf), 1896 " (%jd bytes)", (intmax_t)size); 1897 else 1898 *sizebuf = '\0'; 1899 if (pdata >= 0) { 1900 union sockunion from; 1901 socklen_t fromlen = ctrl_addr.su_len; 1902 int flags, s; 1903 struct timeval timeout; 1904 fd_set set; 1905 1906 FD_ZERO(&set); 1907 FD_SET(pdata, &set); 1908 1909 timeout.tv_usec = 0; 1910 timeout.tv_sec = 120; 1911 1912 /* 1913 * Granted a socket is in the blocking I/O mode, 1914 * accept() will block after a successful select() 1915 * if the selected connection dies in between. 1916 * Therefore set the non-blocking I/O flag here. 1917 */ 1918 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1919 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1920 goto pdata_err; 1921 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1922 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1923 goto pdata_err; 1924 (void) close(pdata); 1925 pdata = s; 1926 /* 1927 * Unset the inherited non-blocking I/O flag 1928 * on the child socket so stdio can work on it. 1929 */ 1930 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1931 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1932 goto pdata_err; 1933 #ifdef IP_TOS 1934 if (from.su_family == AF_INET) 1935 { 1936 tos = IPTOS_THROUGHPUT; 1937 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1938 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1939 } 1940 #endif 1941 reply(150, "Opening %s mode data connection for '%s'%s.", 1942 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1943 return (fdopen(pdata, mode)); 1944 pdata_err: 1945 reply(425, "Can't open data connection."); 1946 (void) close(pdata); 1947 pdata = -1; 1948 return (NULL); 1949 } 1950 if (data >= 0) { 1951 reply(125, "Using existing data connection for '%s'%s.", 1952 name, sizebuf); 1953 usedefault = 1; 1954 return (fdopen(data, mode)); 1955 } 1956 if (usedefault) 1957 data_dest = his_addr; 1958 usedefault = 1; 1959 do { 1960 file = getdatasock(mode); 1961 if (file == NULL) { 1962 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1963 1964 if (getnameinfo((struct sockaddr *)&data_source, 1965 data_source.su_len, 1966 hostbuf, sizeof(hostbuf) - 1, 1967 portbuf, sizeof(portbuf) - 1, 1968 NI_NUMERICHOST|NI_NUMERICSERV)) 1969 *hostbuf = *portbuf = 0; 1970 hostbuf[sizeof(hostbuf) - 1] = 0; 1971 portbuf[sizeof(portbuf) - 1] = 0; 1972 reply(425, "Can't create data socket (%s,%s): %s.", 1973 hostbuf, portbuf, strerror(errno)); 1974 return (NULL); 1975 } 1976 data = fileno(file); 1977 conerrno = 0; 1978 if (connect(data, (struct sockaddr *)&data_dest, 1979 data_dest.su_len) == 0) 1980 break; 1981 conerrno = errno; 1982 (void) fclose(file); 1983 data = -1; 1984 if (conerrno == EADDRINUSE) { 1985 sleep(swaitint); 1986 retry += swaitint; 1987 } else { 1988 break; 1989 } 1990 } while (retry <= swaitmax); 1991 if (conerrno != 0) { 1992 reply(425, "Can't build data connection: %s.", 1993 strerror(conerrno)); 1994 return (NULL); 1995 } 1996 reply(150, "Opening %s mode data connection for '%s'%s.", 1997 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1998 return (file); 1999 } 2000 2001 /* 2002 * A helper macro to avoid code duplication 2003 * in send_data() and receive_data(). 2004 * 2005 * XXX We have to block SIGURG during putc() because BSD stdio 2006 * is unable to restart interrupted write operations and hence 2007 * the entire buffer contents will be lost as soon as a write() 2008 * call indicates EINTR to stdio. 2009 */ 2010 #define FTPD_PUTC(ch, file, label) \ 2011 do { \ 2012 int ret; \ 2013 \ 2014 do { \ 2015 START_UNSAFE; \ 2016 ret = putc((ch), (file)); \ 2017 END_UNSAFE; \ 2018 CHECKOOB(return (-1)) \ 2019 else if (ferror(file)) \ 2020 goto label; \ 2021 clearerr(file); \ 2022 } while (ret == EOF); \ 2023 } while (0) 2024 2025 /* 2026 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2027 * encapsulation of the data subject to Mode, Structure, and Type. 2028 * 2029 * NB: Form isn't handled. 2030 */ 2031 static int 2032 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2033 { 2034 int c, cp, filefd, netfd; 2035 char *buf; 2036 2037 STARTXFER; 2038 2039 switch (type) { 2040 2041 case TYPE_A: 2042 cp = EOF; 2043 for (;;) { 2044 c = getc(instr); 2045 CHECKOOB(return (-1)) 2046 else if (c == EOF && ferror(instr)) 2047 goto file_err; 2048 if (c == EOF) { 2049 if (ferror(instr)) { /* resume after OOB */ 2050 clearerr(instr); 2051 continue; 2052 } 2053 if (feof(instr)) /* EOF */ 2054 break; 2055 syslog(LOG_ERR, "Internal: impossible condition" 2056 " on file after getc()"); 2057 goto file_err; 2058 } 2059 if (c == '\n' && cp != '\r') { 2060 FTPD_PUTC('\r', outstr, data_err); 2061 byte_count++; 2062 } 2063 FTPD_PUTC(c, outstr, data_err); 2064 byte_count++; 2065 cp = c; 2066 } 2067 #ifdef notyet /* BSD stdio isn't ready for that */ 2068 while (fflush(outstr) == EOF) { 2069 CHECKOOB(return (-1)) 2070 else 2071 goto data_err; 2072 clearerr(outstr); 2073 } 2074 ENDXFER; 2075 #else 2076 ENDXFER; 2077 if (fflush(outstr) == EOF) 2078 goto data_err; 2079 #endif 2080 reply(226, "Transfer complete."); 2081 return (0); 2082 2083 case TYPE_I: 2084 case TYPE_L: 2085 /* 2086 * isreg is only set if we are not doing restart and we 2087 * are sending a regular file 2088 */ 2089 netfd = fileno(outstr); 2090 filefd = fileno(instr); 2091 2092 if (isreg) { 2093 char *msg = "Transfer complete."; 2094 off_t cnt, offset; 2095 int err; 2096 2097 cnt = offset = 0; 2098 2099 while (filesize > 0) { 2100 err = sendfile(filefd, netfd, offset, 0, 2101 NULL, &cnt, 0); 2102 /* 2103 * Calculate byte_count before OOB processing. 2104 * It can be used in myoob() later. 2105 */ 2106 byte_count += cnt; 2107 offset += cnt; 2108 filesize -= cnt; 2109 CHECKOOB(return (-1)) 2110 else if (err == -1) { 2111 if (errno != EINTR && 2112 cnt == 0 && offset == 0) 2113 goto oldway; 2114 goto data_err; 2115 } 2116 if (err == -1) /* resume after OOB */ 2117 continue; 2118 /* 2119 * We hit the EOF prematurely. 2120 * Perhaps the file was externally truncated. 2121 */ 2122 if (cnt == 0) { 2123 msg = "Transfer finished due to " 2124 "premature end of file."; 2125 break; 2126 } 2127 } 2128 ENDXFER; 2129 reply(226, "%s", msg); 2130 return (0); 2131 } 2132 2133 oldway: 2134 if ((buf = malloc(blksize)) == NULL) { 2135 ENDXFER; 2136 reply(451, "Ran out of memory."); 2137 return (-1); 2138 } 2139 2140 for (;;) { 2141 int cnt, len; 2142 char *bp; 2143 2144 cnt = read(filefd, buf, blksize); 2145 CHECKOOB(free(buf); return (-1)) 2146 else if (cnt < 0) { 2147 free(buf); 2148 goto file_err; 2149 } 2150 if (cnt < 0) /* resume after OOB */ 2151 continue; 2152 if (cnt == 0) /* EOF */ 2153 break; 2154 for (len = cnt, bp = buf; len > 0;) { 2155 cnt = write(netfd, bp, len); 2156 CHECKOOB(free(buf); return (-1)) 2157 else if (cnt < 0) { 2158 free(buf); 2159 goto data_err; 2160 } 2161 if (cnt <= 0) 2162 continue; 2163 len -= cnt; 2164 bp += cnt; 2165 byte_count += cnt; 2166 } 2167 } 2168 ENDXFER; 2169 free(buf); 2170 reply(226, "Transfer complete."); 2171 return (0); 2172 default: 2173 ENDXFER; 2174 reply(550, "Unimplemented TYPE %d in send_data.", type); 2175 return (-1); 2176 } 2177 2178 data_err: 2179 ENDXFER; 2180 perror_reply(426, "Data connection"); 2181 return (-1); 2182 2183 file_err: 2184 ENDXFER; 2185 perror_reply(551, "Error on input file"); 2186 return (-1); 2187 } 2188 2189 /* 2190 * Transfer data from peer to "outstr" using the appropriate encapulation of 2191 * the data subject to Mode, Structure, and Type. 2192 * 2193 * N.B.: Form isn't handled. 2194 */ 2195 static int 2196 receive_data(FILE *instr, FILE *outstr) 2197 { 2198 int c, cp; 2199 int bare_lfs = 0; 2200 2201 STARTXFER; 2202 2203 switch (type) { 2204 2205 case TYPE_I: 2206 case TYPE_L: 2207 for (;;) { 2208 int cnt, len; 2209 char *bp; 2210 char buf[BUFSIZ]; 2211 2212 cnt = read(fileno(instr), buf, sizeof(buf)); 2213 CHECKOOB(return (-1)) 2214 else if (cnt < 0) 2215 goto data_err; 2216 if (cnt < 0) /* resume after OOB */ 2217 continue; 2218 if (cnt == 0) /* EOF */ 2219 break; 2220 for (len = cnt, bp = buf; len > 0;) { 2221 cnt = write(fileno(outstr), bp, len); 2222 CHECKOOB(return (-1)) 2223 else if (cnt < 0) 2224 goto file_err; 2225 if (cnt <= 0) 2226 continue; 2227 len -= cnt; 2228 bp += cnt; 2229 byte_count += cnt; 2230 } 2231 } 2232 ENDXFER; 2233 return (0); 2234 2235 case TYPE_E: 2236 ENDXFER; 2237 reply(553, "TYPE E not implemented."); 2238 return (-1); 2239 2240 case TYPE_A: 2241 cp = EOF; 2242 for (;;) { 2243 c = getc(instr); 2244 CHECKOOB(return (-1)) 2245 else if (c == EOF && ferror(instr)) 2246 goto data_err; 2247 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2248 clearerr(instr); 2249 continue; 2250 } 2251 2252 if (cp == '\r') { 2253 if (c != '\n') 2254 FTPD_PUTC('\r', outstr, file_err); 2255 } else 2256 if (c == '\n') 2257 bare_lfs++; 2258 if (c == '\r') { 2259 byte_count++; 2260 cp = c; 2261 continue; 2262 } 2263 2264 /* Check for EOF here in order not to lose last \r. */ 2265 if (c == EOF) { 2266 if (feof(instr)) /* EOF */ 2267 break; 2268 syslog(LOG_ERR, "Internal: impossible condition" 2269 " on data stream after getc()"); 2270 goto data_err; 2271 } 2272 2273 byte_count++; 2274 FTPD_PUTC(c, outstr, file_err); 2275 cp = c; 2276 } 2277 #ifdef notyet /* BSD stdio isn't ready for that */ 2278 while (fflush(outstr) == EOF) { 2279 CHECKOOB(return (-1)) 2280 else 2281 goto file_err; 2282 clearerr(outstr); 2283 } 2284 ENDXFER; 2285 #else 2286 ENDXFER; 2287 if (fflush(outstr) == EOF) 2288 goto file_err; 2289 #endif 2290 if (bare_lfs) { 2291 lreply(226, 2292 "WARNING! %d bare linefeeds received in ASCII mode.", 2293 bare_lfs); 2294 (void)printf(" File may not have transferred correctly.\r\n"); 2295 } 2296 return (0); 2297 default: 2298 ENDXFER; 2299 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2300 return (-1); 2301 } 2302 2303 data_err: 2304 ENDXFER; 2305 perror_reply(426, "Data connection"); 2306 return (-1); 2307 2308 file_err: 2309 ENDXFER; 2310 perror_reply(452, "Error writing to file"); 2311 return (-1); 2312 } 2313 2314 void 2315 statfilecmd(char *filename) 2316 { 2317 FILE *fin; 2318 int atstart; 2319 int c, code; 2320 char line[LINE_MAX]; 2321 struct stat st; 2322 2323 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2324 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2325 fin = ftpd_popen(line, "r"); 2326 if (fin == NULL) { 2327 perror_reply(551, filename); 2328 return; 2329 } 2330 lreply(code, "Status of %s:", filename); 2331 atstart = 1; 2332 while ((c = getc(fin)) != EOF) { 2333 if (c == '\n') { 2334 if (ferror(stdout)){ 2335 perror_reply(421, "Control connection"); 2336 (void) ftpd_pclose(fin); 2337 dologout(1); 2338 /* NOTREACHED */ 2339 } 2340 if (ferror(fin)) { 2341 perror_reply(551, filename); 2342 (void) ftpd_pclose(fin); 2343 return; 2344 } 2345 (void) putc('\r', stdout); 2346 } 2347 /* 2348 * RFC 959 says neutral text should be prepended before 2349 * a leading 3-digit number followed by whitespace, but 2350 * many ftp clients can be confused by any leading digits, 2351 * as a matter of fact. 2352 */ 2353 if (atstart && isdigit(c)) 2354 (void) putc(' ', stdout); 2355 (void) putc(c, stdout); 2356 atstart = (c == '\n'); 2357 } 2358 (void) ftpd_pclose(fin); 2359 reply(code, "End of status."); 2360 } 2361 2362 void 2363 statcmd(void) 2364 { 2365 union sockunion *su; 2366 u_char *a, *p; 2367 char hname[NI_MAXHOST]; 2368 int ispassive; 2369 2370 if (hostinfo) { 2371 lreply(211, "%s FTP server status:", hostname); 2372 printf(" %s\r\n", version); 2373 } else 2374 lreply(211, "FTP server status:"); 2375 printf(" Connected to %s", remotehost); 2376 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2377 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2378 hname[sizeof(hname) - 1] = 0; 2379 if (strcmp(hname, remotehost) != 0) 2380 printf(" (%s)", hname); 2381 } 2382 printf("\r\n"); 2383 if (logged_in) { 2384 if (guest) 2385 printf(" Logged in anonymously\r\n"); 2386 else 2387 printf(" Logged in as %s\r\n", pw->pw_name); 2388 } else if (askpasswd) 2389 printf(" Waiting for password\r\n"); 2390 else 2391 printf(" Waiting for user name\r\n"); 2392 printf(" TYPE: %s", typenames[type]); 2393 if (type == TYPE_A || type == TYPE_E) 2394 printf(", FORM: %s", formnames[form]); 2395 if (type == TYPE_L) 2396 #if CHAR_BIT == 8 2397 printf(" %d", CHAR_BIT); 2398 #else 2399 printf(" %d", bytesize); /* need definition! */ 2400 #endif 2401 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2402 strunames[stru], modenames[mode]); 2403 if (data != -1) 2404 printf(" Data connection open\r\n"); 2405 else if (pdata != -1) { 2406 ispassive = 1; 2407 su = &pasv_addr; 2408 goto printaddr; 2409 } else if (usedefault == 0) { 2410 ispassive = 0; 2411 su = &data_dest; 2412 printaddr: 2413 #define UC(b) (((int) b) & 0xff) 2414 if (epsvall) { 2415 printf(" EPSV only mode (EPSV ALL)\r\n"); 2416 goto epsvonly; 2417 } 2418 2419 /* PORT/PASV */ 2420 if (su->su_family == AF_INET) { 2421 a = (u_char *) &su->su_sin.sin_addr; 2422 p = (u_char *) &su->su_sin.sin_port; 2423 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2424 ispassive ? "PASV" : "PORT", 2425 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2426 UC(p[0]), UC(p[1])); 2427 } 2428 2429 /* LPRT/LPSV */ 2430 { 2431 int alen, af, i; 2432 2433 switch (su->su_family) { 2434 case AF_INET: 2435 a = (u_char *) &su->su_sin.sin_addr; 2436 p = (u_char *) &su->su_sin.sin_port; 2437 alen = sizeof(su->su_sin.sin_addr); 2438 af = 4; 2439 break; 2440 case AF_INET6: 2441 a = (u_char *) &su->su_sin6.sin6_addr; 2442 p = (u_char *) &su->su_sin6.sin6_port; 2443 alen = sizeof(su->su_sin6.sin6_addr); 2444 af = 6; 2445 break; 2446 default: 2447 af = 0; 2448 break; 2449 } 2450 if (af) { 2451 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2452 af, alen); 2453 for (i = 0; i < alen; i++) 2454 printf("%d,", UC(a[i])); 2455 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2456 } 2457 } 2458 2459 epsvonly:; 2460 /* EPRT/EPSV */ 2461 { 2462 int af; 2463 2464 switch (su->su_family) { 2465 case AF_INET: 2466 af = 1; 2467 break; 2468 case AF_INET6: 2469 af = 2; 2470 break; 2471 default: 2472 af = 0; 2473 break; 2474 } 2475 if (af) { 2476 union sockunion tmp; 2477 2478 tmp = *su; 2479 if (tmp.su_family == AF_INET6) 2480 tmp.su_sin6.sin6_scope_id = 0; 2481 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2482 hname, sizeof(hname) - 1, NULL, 0, 2483 NI_NUMERICHOST)) { 2484 hname[sizeof(hname) - 1] = 0; 2485 printf(" %s |%d|%s|%d|\r\n", 2486 ispassive ? "EPSV" : "EPRT", 2487 af, hname, htons(tmp.su_port)); 2488 } 2489 } 2490 } 2491 #undef UC 2492 } else 2493 printf(" No data connection\r\n"); 2494 reply(211, "End of status."); 2495 } 2496 2497 void 2498 fatalerror(char *s) 2499 { 2500 2501 reply(451, "Error in server: %s", s); 2502 reply(221, "Closing connection due to server error."); 2503 dologout(0); 2504 /* NOTREACHED */ 2505 } 2506 2507 void 2508 reply(int n, const char *fmt, ...) 2509 { 2510 va_list ap; 2511 2512 (void)printf("%d ", n); 2513 va_start(ap, fmt); 2514 (void)vprintf(fmt, ap); 2515 va_end(ap); 2516 (void)printf("\r\n"); 2517 (void)fflush(stdout); 2518 if (ftpdebug) { 2519 syslog(LOG_DEBUG, "<--- %d ", n); 2520 va_start(ap, fmt); 2521 vsyslog(LOG_DEBUG, fmt, ap); 2522 va_end(ap); 2523 } 2524 } 2525 2526 void 2527 lreply(int n, const char *fmt, ...) 2528 { 2529 va_list ap; 2530 2531 (void)printf("%d- ", n); 2532 va_start(ap, fmt); 2533 (void)vprintf(fmt, ap); 2534 va_end(ap); 2535 (void)printf("\r\n"); 2536 (void)fflush(stdout); 2537 if (ftpdebug) { 2538 syslog(LOG_DEBUG, "<--- %d- ", n); 2539 va_start(ap, fmt); 2540 vsyslog(LOG_DEBUG, fmt, ap); 2541 va_end(ap); 2542 } 2543 } 2544 2545 static void 2546 ack(char *s) 2547 { 2548 2549 reply(250, "%s command successful.", s); 2550 } 2551 2552 void 2553 nack(char *s) 2554 { 2555 2556 reply(502, "%s command not implemented.", s); 2557 } 2558 2559 /* ARGSUSED */ 2560 void 2561 yyerror(char *s) 2562 { 2563 char *cp; 2564 2565 if ((cp = strchr(cbuf,'\n'))) 2566 *cp = '\0'; 2567 reply(500, "%s: command not understood.", cbuf); 2568 } 2569 2570 void 2571 delete(char *name) 2572 { 2573 struct stat st; 2574 2575 LOGCMD("delete", name); 2576 if (lstat(name, &st) < 0) { 2577 perror_reply(550, name); 2578 return; 2579 } 2580 if (S_ISDIR(st.st_mode)) { 2581 if (rmdir(name) < 0) { 2582 perror_reply(550, name); 2583 return; 2584 } 2585 goto done; 2586 } 2587 if (guest && noguestmod) { 2588 reply(550, "Operation not permitted."); 2589 return; 2590 } 2591 if (unlink(name) < 0) { 2592 perror_reply(550, name); 2593 return; 2594 } 2595 done: 2596 ack("DELE"); 2597 } 2598 2599 void 2600 cwd(char *path) 2601 { 2602 2603 if (chdir(path) < 0) 2604 perror_reply(550, path); 2605 else 2606 ack("CWD"); 2607 } 2608 2609 void 2610 makedir(char *name) 2611 { 2612 char *s; 2613 2614 LOGCMD("mkdir", name); 2615 if (guest && noguestmkd) 2616 reply(550, "Operation not permitted."); 2617 else if (mkdir(name, 0777) < 0) 2618 perror_reply(550, name); 2619 else { 2620 if ((s = doublequote(name)) == NULL) 2621 fatalerror("Ran out of memory."); 2622 reply(257, "\"%s\" directory created.", s); 2623 free(s); 2624 } 2625 } 2626 2627 void 2628 removedir(char *name) 2629 { 2630 2631 LOGCMD("rmdir", name); 2632 if (rmdir(name) < 0) 2633 perror_reply(550, name); 2634 else 2635 ack("RMD"); 2636 } 2637 2638 void 2639 pwd(void) 2640 { 2641 char *s, path[MAXPATHLEN + 1]; 2642 2643 if (getcwd(path, sizeof(path)) == NULL) 2644 perror_reply(550, "Get current directory"); 2645 else { 2646 if ((s = doublequote(path)) == NULL) 2647 fatalerror("Ran out of memory."); 2648 reply(257, "\"%s\" is current directory.", s); 2649 free(s); 2650 } 2651 } 2652 2653 char * 2654 renamefrom(char *name) 2655 { 2656 struct stat st; 2657 2658 if (guest && noguestmod) { 2659 reply(550, "Operation not permitted."); 2660 return (NULL); 2661 } 2662 if (lstat(name, &st) < 0) { 2663 perror_reply(550, name); 2664 return (NULL); 2665 } 2666 reply(350, "File exists, ready for destination name."); 2667 return (name); 2668 } 2669 2670 void 2671 renamecmd(char *from, char *to) 2672 { 2673 struct stat st; 2674 2675 LOGCMD2("rename", from, to); 2676 2677 if (guest && (stat(to, &st) == 0)) { 2678 reply(550, "%s: permission denied.", to); 2679 return; 2680 } 2681 2682 if (rename(from, to) < 0) 2683 perror_reply(550, "rename"); 2684 else 2685 ack("RNTO"); 2686 } 2687 2688 static void 2689 dolog(struct sockaddr *who) 2690 { 2691 char who_name[NI_MAXHOST]; 2692 2693 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2694 remotehost[sizeof(remotehost) - 1] = 0; 2695 if (getnameinfo(who, who->sa_len, 2696 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2697 *who_name = 0; 2698 who_name[sizeof(who_name) - 1] = 0; 2699 2700 #ifdef SETPROCTITLE 2701 #ifdef VIRTUAL_HOSTING 2702 if (thishost != firsthost) 2703 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2704 remotehost, hostname); 2705 else 2706 #endif 2707 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2708 remotehost); 2709 setproctitle("%s", proctitle); 2710 #endif /* SETPROCTITLE */ 2711 2712 if (logging) { 2713 #ifdef VIRTUAL_HOSTING 2714 if (thishost != firsthost) 2715 syslog(LOG_INFO, "connection from %s (%s) to %s", 2716 remotehost, who_name, hostname); 2717 else 2718 #endif 2719 syslog(LOG_INFO, "connection from %s (%s)", 2720 remotehost, who_name); 2721 } 2722 } 2723 2724 /* 2725 * Record logout in wtmp file 2726 * and exit with supplied status. 2727 */ 2728 void 2729 dologout(int status) 2730 { 2731 2732 if (logged_in && dowtmp) { 2733 (void) seteuid(0); 2734 #ifdef LOGIN_CAP 2735 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 2736 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 2737 LOGIN_SETENV)); 2738 #endif 2739 ftpd_logwtmp(wtmpid, NULL, NULL); 2740 } 2741 /* beware of flushing buffers after a SIGPIPE */ 2742 _exit(status); 2743 } 2744 2745 static void 2746 sigurg(int signo) 2747 { 2748 2749 recvurg = 1; 2750 } 2751 2752 static void 2753 maskurg(int flag) 2754 { 2755 int oerrno; 2756 sigset_t sset; 2757 2758 if (!transflag) { 2759 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2760 return; 2761 } 2762 oerrno = errno; 2763 sigemptyset(&sset); 2764 sigaddset(&sset, SIGURG); 2765 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2766 errno = oerrno; 2767 } 2768 2769 static void 2770 flagxfer(int flag) 2771 { 2772 2773 if (flag) { 2774 if (transflag) 2775 syslog(LOG_ERR, "Internal: flagxfer(1): " 2776 "transfer already under way"); 2777 transflag = 1; 2778 maskurg(0); 2779 recvurg = 0; 2780 } else { 2781 if (!transflag) 2782 syslog(LOG_ERR, "Internal: flagxfer(0): " 2783 "no active transfer"); 2784 maskurg(1); 2785 transflag = 0; 2786 } 2787 } 2788 2789 /* 2790 * Returns 0 if OK to resume or -1 if abort requested. 2791 */ 2792 static int 2793 myoob(void) 2794 { 2795 char *cp; 2796 int ret; 2797 2798 if (!transflag) { 2799 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2800 return (0); 2801 } 2802 cp = tmpline; 2803 ret = get_line(cp, 7, stdin); 2804 if (ret == -1) { 2805 reply(221, "You could at least say goodbye."); 2806 dologout(0); 2807 } else if (ret == -2) { 2808 /* Ignore truncated command. */ 2809 return (0); 2810 } 2811 upper(cp); 2812 if (strcmp(cp, "ABOR\r\n") == 0) { 2813 tmpline[0] = '\0'; 2814 reply(426, "Transfer aborted. Data connection closed."); 2815 reply(226, "Abort successful."); 2816 return (-1); 2817 } 2818 if (strcmp(cp, "STAT\r\n") == 0) { 2819 tmpline[0] = '\0'; 2820 if (file_size != -1) 2821 reply(213, "Status: %jd of %jd bytes transferred.", 2822 (intmax_t)byte_count, (intmax_t)file_size); 2823 else 2824 reply(213, "Status: %jd bytes transferred.", 2825 (intmax_t)byte_count); 2826 } 2827 return (0); 2828 } 2829 2830 /* 2831 * Note: a response of 425 is not mentioned as a possible response to 2832 * the PASV command in RFC959. However, it has been blessed as 2833 * a legitimate response by Jon Postel in a telephone conversation 2834 * with Rick Adams on 25 Jan 89. 2835 */ 2836 void 2837 passive(void) 2838 { 2839 socklen_t len; 2840 int on; 2841 char *p, *a; 2842 2843 if (pdata >= 0) /* close old port if one set */ 2844 close(pdata); 2845 2846 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2847 if (pdata < 0) { 2848 perror_reply(425, "Can't open passive connection"); 2849 return; 2850 } 2851 on = 1; 2852 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2853 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2854 2855 (void) seteuid(0); 2856 2857 #ifdef IP_PORTRANGE 2858 if (ctrl_addr.su_family == AF_INET) { 2859 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2860 : IP_PORTRANGE_DEFAULT; 2861 2862 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2863 &on, sizeof(on)) < 0) 2864 goto pasv_error; 2865 } 2866 #endif 2867 #ifdef IPV6_PORTRANGE 2868 if (ctrl_addr.su_family == AF_INET6) { 2869 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2870 : IPV6_PORTRANGE_DEFAULT; 2871 2872 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2873 &on, sizeof(on)) < 0) 2874 goto pasv_error; 2875 } 2876 #endif 2877 2878 pasv_addr = ctrl_addr; 2879 pasv_addr.su_port = 0; 2880 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2881 goto pasv_error; 2882 2883 (void) seteuid(pw->pw_uid); 2884 2885 len = sizeof(pasv_addr); 2886 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2887 goto pasv_error; 2888 if (listen(pdata, 1) < 0) 2889 goto pasv_error; 2890 if (pasv_addr.su_family == AF_INET) 2891 a = (char *) &pasv_addr.su_sin.sin_addr; 2892 else if (pasv_addr.su_family == AF_INET6 && 2893 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2894 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2895 else 2896 goto pasv_error; 2897 2898 p = (char *) &pasv_addr.su_port; 2899 2900 #define UC(b) (((int) b) & 0xff) 2901 2902 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2903 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2904 return; 2905 2906 pasv_error: 2907 (void) seteuid(pw->pw_uid); 2908 (void) close(pdata); 2909 pdata = -1; 2910 perror_reply(425, "Can't open passive connection"); 2911 return; 2912 } 2913 2914 /* 2915 * Long Passive defined in RFC 1639. 2916 * 228 Entering Long Passive Mode 2917 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2918 */ 2919 2920 void 2921 long_passive(char *cmd, int pf) 2922 { 2923 socklen_t len; 2924 int on; 2925 char *p, *a; 2926 2927 if (pdata >= 0) /* close old port if one set */ 2928 close(pdata); 2929 2930 if (pf != PF_UNSPEC) { 2931 if (ctrl_addr.su_family != pf) { 2932 switch (ctrl_addr.su_family) { 2933 case AF_INET: 2934 pf = 1; 2935 break; 2936 case AF_INET6: 2937 pf = 2; 2938 break; 2939 default: 2940 pf = 0; 2941 break; 2942 } 2943 /* 2944 * XXX 2945 * only EPRT/EPSV ready clients will understand this 2946 */ 2947 if (strcmp(cmd, "EPSV") == 0 && pf) { 2948 reply(522, "Network protocol mismatch, " 2949 "use (%d)", pf); 2950 } else 2951 reply(501, "Network protocol mismatch."); /*XXX*/ 2952 2953 return; 2954 } 2955 } 2956 2957 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2958 if (pdata < 0) { 2959 perror_reply(425, "Can't open passive connection"); 2960 return; 2961 } 2962 on = 1; 2963 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2964 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2965 2966 (void) seteuid(0); 2967 2968 pasv_addr = ctrl_addr; 2969 pasv_addr.su_port = 0; 2970 len = pasv_addr.su_len; 2971 2972 #ifdef IP_PORTRANGE 2973 if (ctrl_addr.su_family == AF_INET) { 2974 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2975 : IP_PORTRANGE_DEFAULT; 2976 2977 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2978 &on, sizeof(on)) < 0) 2979 goto pasv_error; 2980 } 2981 #endif 2982 #ifdef IPV6_PORTRANGE 2983 if (ctrl_addr.su_family == AF_INET6) { 2984 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2985 : IPV6_PORTRANGE_DEFAULT; 2986 2987 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2988 &on, sizeof(on)) < 0) 2989 goto pasv_error; 2990 } 2991 #endif 2992 2993 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2994 goto pasv_error; 2995 2996 (void) seteuid(pw->pw_uid); 2997 2998 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2999 goto pasv_error; 3000 if (listen(pdata, 1) < 0) 3001 goto pasv_error; 3002 3003 #define UC(b) (((int) b) & 0xff) 3004 3005 if (strcmp(cmd, "LPSV") == 0) { 3006 p = (char *)&pasv_addr.su_port; 3007 switch (pasv_addr.su_family) { 3008 case AF_INET: 3009 a = (char *) &pasv_addr.su_sin.sin_addr; 3010 v4_reply: 3011 reply(228, 3012 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3013 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3014 2, UC(p[0]), UC(p[1])); 3015 return; 3016 case AF_INET6: 3017 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3018 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3019 goto v4_reply; 3020 } 3021 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3022 reply(228, 3023 "Entering Long Passive Mode " 3024 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3025 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3026 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3027 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3028 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3029 2, UC(p[0]), UC(p[1])); 3030 return; 3031 } 3032 } else if (strcmp(cmd, "EPSV") == 0) { 3033 switch (pasv_addr.su_family) { 3034 case AF_INET: 3035 case AF_INET6: 3036 reply(229, "Entering Extended Passive Mode (|||%d|)", 3037 ntohs(pasv_addr.su_port)); 3038 return; 3039 } 3040 } else { 3041 /* more proper error code? */ 3042 } 3043 3044 pasv_error: 3045 (void) seteuid(pw->pw_uid); 3046 (void) close(pdata); 3047 pdata = -1; 3048 perror_reply(425, "Can't open passive connection"); 3049 return; 3050 } 3051 3052 /* 3053 * Generate unique name for file with basename "local" 3054 * and open the file in order to avoid possible races. 3055 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3056 * Return descriptor to the file, set "name" to its name. 3057 * 3058 * Generates failure reply on error. 3059 */ 3060 static int 3061 guniquefd(char *local, char **name) 3062 { 3063 static char new[MAXPATHLEN]; 3064 struct stat st; 3065 char *cp; 3066 int count; 3067 int fd; 3068 3069 cp = strrchr(local, '/'); 3070 if (cp) 3071 *cp = '\0'; 3072 if (stat(cp ? local : ".", &st) < 0) { 3073 perror_reply(553, cp ? local : "."); 3074 return (-1); 3075 } 3076 if (cp) { 3077 /* 3078 * Let not overwrite dirname with counter suffix. 3079 * -4 is for /nn\0 3080 * In this extreme case dot won't be put in front of suffix. 3081 */ 3082 if (strlen(local) > sizeof(new) - 4) { 3083 reply(553, "Pathname too long."); 3084 return (-1); 3085 } 3086 *cp = '/'; 3087 } 3088 /* -4 is for the .nn<null> we put on the end below */ 3089 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3090 cp = new + strlen(new); 3091 /* 3092 * Don't generate dotfile unless requested explicitly. 3093 * This covers the case when basename gets truncated off 3094 * by buffer size. 3095 */ 3096 if (cp > new && cp[-1] != '/') 3097 *cp++ = '.'; 3098 for (count = 0; count < 100; count++) { 3099 /* At count 0 try unmodified name */ 3100 if (count) 3101 (void)sprintf(cp, "%d", count); 3102 if ((fd = open(count ? new : local, 3103 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3104 *name = count ? new : local; 3105 return (fd); 3106 } 3107 if (errno != EEXIST) { 3108 perror_reply(553, count ? new : local); 3109 return (-1); 3110 } 3111 } 3112 reply(452, "Unique file name cannot be created."); 3113 return (-1); 3114 } 3115 3116 /* 3117 * Format and send reply containing system error number. 3118 */ 3119 void 3120 perror_reply(int code, char *string) 3121 { 3122 3123 reply(code, "%s: %s.", string, strerror(errno)); 3124 } 3125 3126 static char *onefile[] = { 3127 "", 3128 0 3129 }; 3130 3131 void 3132 send_file_list(char *whichf) 3133 { 3134 struct stat st; 3135 DIR *dirp = NULL; 3136 struct dirent *dir; 3137 FILE *dout = NULL; 3138 char **dirlist, *dirname; 3139 int simple = 0; 3140 int freeglob = 0; 3141 glob_t gl; 3142 3143 if (strpbrk(whichf, "~{[*?") != NULL) { 3144 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3145 3146 memset(&gl, 0, sizeof(gl)); 3147 gl.gl_matchc = MAXGLOBARGS; 3148 flags |= GLOB_LIMIT; 3149 freeglob = 1; 3150 if (glob(whichf, flags, 0, &gl)) { 3151 reply(550, "No matching files found."); 3152 goto out; 3153 } else if (gl.gl_pathc == 0) { 3154 errno = ENOENT; 3155 perror_reply(550, whichf); 3156 goto out; 3157 } 3158 dirlist = gl.gl_pathv; 3159 } else { 3160 onefile[0] = whichf; 3161 dirlist = onefile; 3162 simple = 1; 3163 } 3164 3165 while ((dirname = *dirlist++)) { 3166 if (stat(dirname, &st) < 0) { 3167 /* 3168 * If user typed "ls -l", etc, and the client 3169 * used NLST, do what the user meant. 3170 */ 3171 if (dirname[0] == '-' && *dirlist == NULL && 3172 dout == NULL) 3173 retrieve(_PATH_LS " %s", dirname); 3174 else 3175 perror_reply(550, whichf); 3176 goto out; 3177 } 3178 3179 if (S_ISREG(st.st_mode)) { 3180 if (dout == NULL) { 3181 dout = dataconn("file list", -1, "w"); 3182 if (dout == NULL) 3183 goto out; 3184 STARTXFER; 3185 } 3186 START_UNSAFE; 3187 fprintf(dout, "%s%s\n", dirname, 3188 type == TYPE_A ? "\r" : ""); 3189 END_UNSAFE; 3190 if (ferror(dout)) 3191 goto data_err; 3192 byte_count += strlen(dirname) + 3193 (type == TYPE_A ? 2 : 1); 3194 CHECKOOB(goto abrt); 3195 continue; 3196 } else if (!S_ISDIR(st.st_mode)) 3197 continue; 3198 3199 if ((dirp = opendir(dirname)) == NULL) 3200 continue; 3201 3202 while ((dir = readdir(dirp)) != NULL) { 3203 char nbuf[MAXPATHLEN]; 3204 3205 CHECKOOB(goto abrt); 3206 3207 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3208 continue; 3209 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3210 dir->d_namlen == 2) 3211 continue; 3212 3213 snprintf(nbuf, sizeof(nbuf), 3214 "%s/%s", dirname, dir->d_name); 3215 3216 /* 3217 * We have to do a stat to insure it's 3218 * not a directory or special file. 3219 */ 3220 if (simple || (stat(nbuf, &st) == 0 && 3221 S_ISREG(st.st_mode))) { 3222 if (dout == NULL) { 3223 dout = dataconn("file list", -1, "w"); 3224 if (dout == NULL) 3225 goto out; 3226 STARTXFER; 3227 } 3228 START_UNSAFE; 3229 if (nbuf[0] == '.' && nbuf[1] == '/') 3230 fprintf(dout, "%s%s\n", &nbuf[2], 3231 type == TYPE_A ? "\r" : ""); 3232 else 3233 fprintf(dout, "%s%s\n", nbuf, 3234 type == TYPE_A ? "\r" : ""); 3235 END_UNSAFE; 3236 if (ferror(dout)) 3237 goto data_err; 3238 byte_count += strlen(nbuf) + 3239 (type == TYPE_A ? 2 : 1); 3240 CHECKOOB(goto abrt); 3241 } 3242 } 3243 (void) closedir(dirp); 3244 dirp = NULL; 3245 } 3246 3247 if (dout == NULL) 3248 reply(550, "No files found."); 3249 else if (ferror(dout)) 3250 data_err: perror_reply(550, "Data connection"); 3251 else 3252 reply(226, "Transfer complete."); 3253 out: 3254 if (dout) { 3255 ENDXFER; 3256 abrt: 3257 (void) fclose(dout); 3258 data = -1; 3259 pdata = -1; 3260 } 3261 if (dirp) 3262 (void) closedir(dirp); 3263 if (freeglob) { 3264 freeglob = 0; 3265 globfree(&gl); 3266 } 3267 } 3268 3269 void 3270 reapchild(int signo) 3271 { 3272 while (waitpid(-1, NULL, WNOHANG) > 0); 3273 } 3274 3275 static void 3276 appendf(char **strp, char *fmt, ...) 3277 { 3278 va_list ap; 3279 char *ostr, *p; 3280 3281 va_start(ap, fmt); 3282 vasprintf(&p, fmt, ap); 3283 va_end(ap); 3284 if (p == NULL) 3285 fatalerror("Ran out of memory."); 3286 if (*strp == NULL) 3287 *strp = p; 3288 else { 3289 ostr = *strp; 3290 asprintf(strp, "%s%s", ostr, p); 3291 if (*strp == NULL) 3292 fatalerror("Ran out of memory."); 3293 free(ostr); 3294 } 3295 } 3296 3297 static void 3298 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3299 { 3300 char *msg = NULL; 3301 char wd[MAXPATHLEN + 1]; 3302 3303 if (logging <= 1) 3304 return; 3305 3306 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3307 strcpy(wd, strerror(errno)); 3308 3309 appendf(&msg, "%s", cmd); 3310 if (file1) 3311 appendf(&msg, " %s", file1); 3312 if (file2) 3313 appendf(&msg, " %s", file2); 3314 if (cnt >= 0) 3315 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3316 appendf(&msg, " (wd: %s", wd); 3317 if (guest || dochroot) 3318 appendf(&msg, "; chrooted"); 3319 appendf(&msg, ")"); 3320 syslog(LOG_INFO, "%s", msg); 3321 free(msg); 3322 } 3323 3324 static void 3325 logxfer(char *name, off_t size, time_t start) 3326 { 3327 char buf[MAXPATHLEN + 1024]; 3328 char path[MAXPATHLEN + 1]; 3329 time_t now; 3330 3331 if (statfd >= 0) { 3332 time(&now); 3333 if (realpath(name, path) == NULL) { 3334 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3335 return; 3336 } 3337 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3338 ctime(&now)+4, ident, remotehost, 3339 path, (intmax_t)size, 3340 (long)(now - start + (now == start))); 3341 write(statfd, buf, strlen(buf)); 3342 } 3343 } 3344 3345 static char * 3346 doublequote(char *s) 3347 { 3348 int n; 3349 char *p, *s2; 3350 3351 for (p = s, n = 0; *p; p++) 3352 if (*p == '"') 3353 n++; 3354 3355 if ((s2 = malloc(p - s + n + 1)) == NULL) 3356 return (NULL); 3357 3358 for (p = s2; *s; s++, p++) { 3359 if ((*p = *s) == '"') 3360 *(++p) = '"'; 3361 } 3362 *p = '\0'; 3363 3364 return (s2); 3365 } 3366 3367 /* setup server socket for specified address family */ 3368 /* if af is PF_UNSPEC more than one socket may be returned */ 3369 /* the returned list is dynamically allocated, so caller needs to free it */ 3370 static int * 3371 socksetup(int af, char *bindname, const char *bindport) 3372 { 3373 struct addrinfo hints, *res, *r; 3374 int error, maxs, *s, *socks; 3375 const int on = 1; 3376 3377 memset(&hints, 0, sizeof(hints)); 3378 hints.ai_flags = AI_PASSIVE; 3379 hints.ai_family = af; 3380 hints.ai_socktype = SOCK_STREAM; 3381 error = getaddrinfo(bindname, bindport, &hints, &res); 3382 if (error) { 3383 syslog(LOG_ERR, "%s", gai_strerror(error)); 3384 if (error == EAI_SYSTEM) 3385 syslog(LOG_ERR, "%s", strerror(errno)); 3386 return NULL; 3387 } 3388 3389 /* Count max number of sockets we may open */ 3390 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3391 ; 3392 socks = malloc((maxs + 1) * sizeof(int)); 3393 if (!socks) { 3394 freeaddrinfo(res); 3395 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3396 return NULL; 3397 } 3398 3399 *socks = 0; /* num of sockets counter at start of array */ 3400 s = socks + 1; 3401 for (r = res; r; r = r->ai_next) { 3402 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3403 if (*s < 0) { 3404 syslog(LOG_DEBUG, "control socket: %m"); 3405 continue; 3406 } 3407 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3408 &on, sizeof(on)) < 0) 3409 syslog(LOG_WARNING, 3410 "control setsockopt (SO_REUSEADDR): %m"); 3411 if (r->ai_family == AF_INET6) { 3412 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3413 &on, sizeof(on)) < 0) 3414 syslog(LOG_WARNING, 3415 "control setsockopt (IPV6_V6ONLY): %m"); 3416 } 3417 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3418 syslog(LOG_DEBUG, "control bind: %m"); 3419 close(*s); 3420 continue; 3421 } 3422 (*socks)++; 3423 s++; 3424 } 3425 3426 if (res) 3427 freeaddrinfo(res); 3428 3429 if (*socks == 0) { 3430 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3431 free(socks); 3432 return NULL; 3433 } 3434 return(socks); 3435 } 3436