1 /* 2 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if 0 35 #ifndef lint 36 static char copyright[] = 37 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #endif /* not lint */ 40 #endif 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 45 #endif 46 #endif /* not lint */ 47 48 #include <sys/cdefs.h> 49 __FBSDID("$FreeBSD$"); 50 51 /* 52 * FTP server. 53 */ 54 #include <sys/param.h> 55 #include <sys/ioctl.h> 56 #include <sys/mman.h> 57 #include <sys/socket.h> 58 #include <sys/stat.h> 59 #include <sys/time.h> 60 #include <sys/wait.h> 61 62 #include <netinet/in.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/ip.h> 65 #include <netinet/tcp.h> 66 67 #define FTP_NAMES 68 #include <arpa/ftp.h> 69 #include <arpa/inet.h> 70 #include <arpa/telnet.h> 71 72 #include <ctype.h> 73 #include <dirent.h> 74 #include <err.h> 75 #include <errno.h> 76 #include <fcntl.h> 77 #include <glob.h> 78 #include <limits.h> 79 #include <netdb.h> 80 #include <pwd.h> 81 #include <grp.h> 82 #include <opie.h> 83 #include <signal.h> 84 #include <stdint.h> 85 #include <stdio.h> 86 #include <stdlib.h> 87 #include <string.h> 88 #include <syslog.h> 89 #include <time.h> 90 #include <unistd.h> 91 #include <libutil.h> 92 #ifdef LOGIN_CAP 93 #include <login_cap.h> 94 #endif 95 96 #ifdef USE_PAM 97 #include <security/pam_appl.h> 98 #endif 99 100 #include "pathnames.h" 101 #include "extern.h" 102 103 #include <stdarg.h> 104 105 static char version[] = "Version 6.00LS"; 106 #undef main 107 108 extern off_t restart_point; 109 extern char cbuf[]; 110 111 union sockunion ctrl_addr; 112 union sockunion data_source; 113 union sockunion data_dest; 114 union sockunion his_addr; 115 union sockunion pasv_addr; 116 117 int daemon_mode; 118 int data; 119 int dataport; 120 int hostinfo = 1; /* print host-specific info in messages */ 121 int logged_in; 122 struct passwd *pw; 123 char *homedir; 124 int ftpdebug; 125 int timeout = 900; /* timeout after 15 minutes of inactivity */ 126 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 127 int logging; 128 int restricted_data_ports = 1; 129 int paranoid = 1; /* be extra careful about security */ 130 int anon_only = 0; /* Only anonymous ftp allowed */ 131 int guest; 132 int dochroot; 133 char *chrootdir; 134 int dowtmp = 1; 135 int stats; 136 int statfd = -1; 137 int type; 138 int form; 139 int stru; /* avoid C keyword */ 140 int mode; 141 int usedefault = 1; /* for data transfers */ 142 int pdata = -1; /* for passive mode */ 143 int readonly = 0; /* Server is in readonly mode. */ 144 int noepsv = 0; /* EPSV command is disabled. */ 145 int noretr = 0; /* RETR command is disabled. */ 146 int noguestretr = 0; /* RETR command is disabled for anon users. */ 147 int noguestmkd = 0; /* MKD command is disabled for anon users. */ 148 int noguestmod = 1; /* anon users may not modify existing files. */ 149 150 off_t file_size; 151 off_t byte_count; 152 #if !defined(CMASK) || CMASK == 0 153 #undef CMASK 154 #define CMASK 027 155 #endif 156 int defumask = CMASK; /* default umask value */ 157 char tmpline[7]; 158 char *hostname; 159 int epsvall = 0; 160 161 #ifdef VIRTUAL_HOSTING 162 char *ftpuser; 163 164 static struct ftphost { 165 struct ftphost *next; 166 struct addrinfo *hostinfo; 167 char *hostname; 168 char *anonuser; 169 char *statfile; 170 char *welcome; 171 char *loginmsg; 172 } *thishost, *firsthost; 173 174 #endif 175 char remotehost[NI_MAXHOST]; 176 char *ident = NULL; 177 178 static char ttyline[20]; 179 char *tty = ttyline; /* for klogin */ 180 181 #ifdef USE_PAM 182 static int auth_pam(struct passwd**, const char*); 183 pam_handle_t *pamh = NULL; 184 #endif 185 186 static struct opie opiedata; 187 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 188 static int pwok; 189 190 char *pid_file = NULL; 191 192 /* 193 * Limit number of pathnames that glob can return. 194 * A limit of 0 indicates the number of pathnames is unlimited. 195 */ 196 #define MAXGLOBARGS 16384 197 # 198 199 /* 200 * Timeout intervals for retrying connections 201 * to hosts that don't accept PORT cmds. This 202 * is a kludge, but given the problems with TCP... 203 */ 204 #define SWAITMAX 90 /* wait at most 90 seconds */ 205 #define SWAITINT 5 /* interval between retries */ 206 207 int swaitmax = SWAITMAX; 208 int swaitint = SWAITINT; 209 210 #ifdef SETPROCTITLE 211 #ifdef OLD_SETPROCTITLE 212 char **Argv = NULL; /* pointer to argument vector */ 213 char *LastArgv = NULL; /* end of argv */ 214 #endif /* OLD_SETPROCTITLE */ 215 char proctitle[LINE_MAX]; /* initial part of title */ 216 #endif /* SETPROCTITLE */ 217 218 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 219 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 220 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 221 222 static volatile sig_atomic_t recvurg; 223 static int transflag; /* NB: for debugging only */ 224 225 #define STARTXFER flagxfer(1) 226 #define ENDXFER flagxfer(0) 227 228 #define START_UNSAFE maskurg(1) 229 #define END_UNSAFE maskurg(0) 230 231 /* It's OK to put an `else' clause after this macro. */ 232 #define CHECKOOB(action) \ 233 if (recvurg) { \ 234 recvurg = 0; \ 235 if (myoob()) { \ 236 ENDXFER; \ 237 action; \ 238 } \ 239 } 240 241 #ifdef VIRTUAL_HOSTING 242 static void inithosts(void); 243 static void selecthost(union sockunion *); 244 #endif 245 static void ack(char *); 246 static void sigurg(int); 247 static void maskurg(int); 248 static void flagxfer(int); 249 static int myoob(void); 250 static int checkuser(char *, char *, int, char **); 251 static FILE *dataconn(char *, off_t, char *); 252 static void dolog(struct sockaddr *); 253 static void end_login(void); 254 static FILE *getdatasock(char *); 255 static int guniquefd(char *, char **); 256 static void lostconn(int); 257 static void sigquit(int); 258 static int receive_data(FILE *, FILE *); 259 static int send_data(FILE *, FILE *, size_t, off_t, int); 260 static struct passwd * 261 sgetpwnam(char *); 262 static char *sgetsave(char *); 263 static void reapchild(int); 264 static void appendf(char **, char *, ...) __printflike(2, 3); 265 static void logcmd(char *, char *, char *, off_t); 266 static void logxfer(char *, off_t, time_t); 267 static char *doublequote(char *); 268 static int *socksetup(int, char *, const char *); 269 270 int 271 main(int argc, char *argv[], char **envp) 272 { 273 socklen_t addrlen; 274 int ch, on = 1, tos; 275 char *cp, line[LINE_MAX]; 276 FILE *fd; 277 char *bindname = NULL; 278 const char *bindport = "ftp"; 279 int family = AF_UNSPEC; 280 struct sigaction sa; 281 282 tzset(); /* in case no timezone database in ~ftp */ 283 sigemptyset(&sa.sa_mask); 284 sa.sa_flags = SA_RESTART; 285 286 #ifdef OLD_SETPROCTITLE 287 /* 288 * Save start and extent of argv for setproctitle. 289 */ 290 Argv = argv; 291 while (*envp) 292 envp++; 293 LastArgv = envp[-1] + strlen(envp[-1]); 294 #endif /* OLD_SETPROCTITLE */ 295 296 /* 297 * Prevent diagnostic messages from appearing on stderr. 298 * We run as a daemon or from inetd; in both cases, there's 299 * more reason in logging to syslog. 300 */ 301 (void) freopen(_PATH_DEVNULL, "w", stderr); 302 opterr = 0; 303 304 /* 305 * LOG_NDELAY sets up the logging connection immediately, 306 * necessary for anonymous ftp's that chroot and can't do it later. 307 */ 308 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 309 310 while ((ch = getopt(argc, argv, 311 "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 312 switch (ch) { 313 case '4': 314 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 315 break; 316 317 case '6': 318 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 319 break; 320 321 case 'a': 322 bindname = optarg; 323 break; 324 325 case 'A': 326 anon_only = 1; 327 break; 328 329 case 'd': 330 ftpdebug++; 331 break; 332 333 case 'D': 334 daemon_mode++; 335 break; 336 337 case 'E': 338 noepsv = 1; 339 break; 340 341 case 'h': 342 hostinfo = 0; 343 break; 344 345 case 'l': 346 logging++; /* > 1 == extra logging */ 347 break; 348 349 case 'm': 350 noguestmod = 0; 351 break; 352 353 case 'M': 354 noguestmkd = 1; 355 break; 356 357 case 'o': 358 noretr = 1; 359 break; 360 361 case 'O': 362 noguestretr = 1; 363 break; 364 365 case 'p': 366 pid_file = optarg; 367 break; 368 369 case 'P': 370 bindport = optarg; 371 break; 372 373 case 'r': 374 readonly = 1; 375 break; 376 377 case 'R': 378 paranoid = 0; 379 break; 380 381 case 'S': 382 stats++; 383 break; 384 385 case 't': 386 timeout = atoi(optarg); 387 if (maxtimeout < timeout) 388 maxtimeout = timeout; 389 break; 390 391 case 'T': 392 maxtimeout = atoi(optarg); 393 if (timeout > maxtimeout) 394 timeout = maxtimeout; 395 break; 396 397 case 'u': 398 { 399 long val = 0; 400 401 val = strtol(optarg, &optarg, 8); 402 if (*optarg != '\0' || val < 0) 403 syslog(LOG_WARNING, "bad value for -u"); 404 else 405 defumask = val; 406 break; 407 } 408 case 'U': 409 restricted_data_ports = 0; 410 break; 411 412 case 'v': 413 ftpdebug++; 414 break; 415 416 case 'W': 417 dowtmp = 0; 418 break; 419 420 default: 421 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 422 break; 423 } 424 } 425 426 #ifdef VIRTUAL_HOSTING 427 inithosts(); 428 #endif 429 430 if (daemon_mode) { 431 int *ctl_sock, fd, maxfd = -1, nfds, i; 432 fd_set defreadfds, readfds; 433 pid_t pid; 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 sa.sa_handler = reapchild; 443 (void)sigaction(SIGCHLD, &sa, NULL); 444 445 /* 446 * Open a socket, bind it to the FTP port, and start 447 * listening. 448 */ 449 ctl_sock = socksetup(family, bindname, bindport); 450 if (ctl_sock == NULL) 451 exit(1); 452 453 FD_ZERO(&defreadfds); 454 for (i = 1; i <= *ctl_sock; i++) { 455 FD_SET(ctl_sock[i], &defreadfds); 456 if (listen(ctl_sock[i], 32) < 0) { 457 syslog(LOG_ERR, "control listen: %m"); 458 exit(1); 459 } 460 if (maxfd < ctl_sock[i]) 461 maxfd = ctl_sock[i]; 462 } 463 464 /* 465 * Atomically write process ID 466 */ 467 if (pid_file) 468 { 469 int fd; 470 char buf[20]; 471 472 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 473 | O_NONBLOCK | O_EXLOCK, 0644); 474 if (fd < 0) { 475 if (errno == EAGAIN) 476 syslog(LOG_ERR, 477 "%s: already locked", pid_file); 478 else 479 syslog(LOG_ERR, "%s: %m", pid_file); 480 exit(1); 481 } 482 snprintf(buf, sizeof(buf), 483 "%lu\n", (unsigned long) getpid()); 484 if (write(fd, buf, strlen(buf)) < 0) { 485 syslog(LOG_ERR, "%s: write: %m", pid_file); 486 exit(1); 487 } 488 /* Leave the pid file open and locked */ 489 } 490 /* 491 * Loop forever accepting connection requests and forking off 492 * children to handle them. 493 */ 494 while (1) { 495 FD_COPY(&defreadfds, &readfds); 496 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 497 if (nfds <= 0) { 498 if (nfds < 0 && errno != EINTR) 499 syslog(LOG_WARNING, "select: %m"); 500 continue; 501 } 502 503 pid = -1; 504 for (i = 1; i <= *ctl_sock; i++) 505 if (FD_ISSET(ctl_sock[i], &readfds)) { 506 addrlen = sizeof(his_addr); 507 fd = accept(ctl_sock[i], 508 (struct sockaddr *)&his_addr, 509 &addrlen); 510 if (fd >= 0) { 511 if ((pid = fork()) == 0) { 512 /* child */ 513 (void) dup2(fd, 0); 514 (void) dup2(fd, 1); 515 close(ctl_sock[i]); 516 } else 517 close(fd); 518 } 519 } 520 if (pid == 0) 521 break; 522 } 523 } else { 524 addrlen = sizeof(his_addr); 525 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 526 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 527 exit(1); 528 } 529 } 530 531 sa.sa_handler = SIG_DFL; 532 (void)sigaction(SIGCHLD, &sa, NULL); 533 534 sa.sa_handler = sigurg; 535 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 536 (void)sigaction(SIGURG, &sa, NULL); 537 538 sigfillset(&sa.sa_mask); /* block all signals in handler */ 539 sa.sa_flags = SA_RESTART; 540 sa.sa_handler = sigquit; 541 (void)sigaction(SIGHUP, &sa, NULL); 542 (void)sigaction(SIGINT, &sa, NULL); 543 (void)sigaction(SIGQUIT, &sa, NULL); 544 (void)sigaction(SIGTERM, &sa, NULL); 545 546 sa.sa_handler = lostconn; 547 (void)sigaction(SIGPIPE, &sa, NULL); 548 549 addrlen = sizeof(ctrl_addr); 550 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 551 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 552 exit(1); 553 } 554 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 555 #ifdef VIRTUAL_HOSTING 556 /* select our identity from virtual host table */ 557 selecthost(&ctrl_addr); 558 #endif 559 #ifdef IP_TOS 560 if (ctrl_addr.su_family == AF_INET) 561 { 562 tos = IPTOS_LOWDELAY; 563 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 564 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 565 } 566 #endif 567 /* 568 * Disable Nagle on the control channel so that we don't have to wait 569 * for peer's ACK before issuing our next reply. 570 */ 571 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 572 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 573 574 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 575 576 /* set this here so klogin can use it... */ 577 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 578 579 /* Try to handle urgent data inline */ 580 #ifdef SO_OOBINLINE 581 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 582 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 583 #endif 584 585 #ifdef F_SETOWN 586 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 587 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 588 #endif 589 dolog((struct sockaddr *)&his_addr); 590 /* 591 * Set up default state 592 */ 593 data = -1; 594 type = TYPE_A; 595 form = FORM_N; 596 stru = STRU_F; 597 mode = MODE_S; 598 tmpline[0] = '\0'; 599 600 /* If logins are disabled, print out the message. */ 601 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 602 while (fgets(line, sizeof(line), fd) != NULL) { 603 if ((cp = strchr(line, '\n')) != NULL) 604 *cp = '\0'; 605 lreply(530, "%s", line); 606 } 607 (void) fflush(stdout); 608 (void) fclose(fd); 609 reply(530, "System not available."); 610 exit(0); 611 } 612 #ifdef VIRTUAL_HOSTING 613 fd = fopen(thishost->welcome, "r"); 614 #else 615 fd = fopen(_PATH_FTPWELCOME, "r"); 616 #endif 617 if (fd != NULL) { 618 while (fgets(line, sizeof(line), fd) != NULL) { 619 if ((cp = strchr(line, '\n')) != NULL) 620 *cp = '\0'; 621 lreply(220, "%s", line); 622 } 623 (void) fflush(stdout); 624 (void) fclose(fd); 625 /* reply(220,) must follow */ 626 } 627 #ifndef VIRTUAL_HOSTING 628 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 629 fatalerror("Ran out of memory."); 630 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 631 hostname[0] = '\0'; 632 hostname[MAXHOSTNAMELEN - 1] = '\0'; 633 #endif 634 if (hostinfo) 635 reply(220, "%s FTP server (%s) ready.", hostname, version); 636 else 637 reply(220, "FTP server ready."); 638 for (;;) 639 (void) yyparse(); 640 /* NOTREACHED */ 641 } 642 643 static void 644 lostconn(int signo) 645 { 646 647 if (ftpdebug) 648 syslog(LOG_DEBUG, "lost connection"); 649 dologout(1); 650 } 651 652 static void 653 sigquit(int signo) 654 { 655 656 syslog(LOG_ERR, "got signal %d", signo); 657 dologout(1); 658 } 659 660 #ifdef VIRTUAL_HOSTING 661 /* 662 * read in virtual host tables (if they exist) 663 */ 664 665 static void 666 inithosts(void) 667 { 668 int insert; 669 size_t len; 670 FILE *fp; 671 char *cp, *mp, *line; 672 char *hostname; 673 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 674 struct ftphost *hrp, *lhrp; 675 struct addrinfo hints, *res, *ai; 676 677 /* 678 * Fill in the default host information 679 */ 680 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 681 fatalerror("Ran out of memory."); 682 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 683 hostname[0] = '\0'; 684 hostname[MAXHOSTNAMELEN - 1] = '\0'; 685 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 686 fatalerror("Ran out of memory."); 687 hrp->hostname = hostname; 688 hrp->hostinfo = NULL; 689 690 memset(&hints, 0, sizeof(hints)); 691 hints.ai_flags = AI_CANONNAME; 692 hints.ai_family = AF_UNSPEC; 693 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 694 hrp->hostinfo = res; 695 hrp->statfile = _PATH_FTPDSTATFILE; 696 hrp->welcome = _PATH_FTPWELCOME; 697 hrp->loginmsg = _PATH_FTPLOGINMESG; 698 hrp->anonuser = "ftp"; 699 hrp->next = NULL; 700 thishost = firsthost = lhrp = hrp; 701 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 702 int addrsize, gothost; 703 void *addr; 704 struct hostent *hp; 705 706 while ((line = fgetln(fp, &len)) != NULL) { 707 int i, hp_error; 708 709 /* skip comments */ 710 if (line[0] == '#') 711 continue; 712 if (line[len - 1] == '\n') { 713 line[len - 1] = '\0'; 714 mp = NULL; 715 } else { 716 if ((mp = malloc(len + 1)) == NULL) 717 fatalerror("Ran out of memory."); 718 memcpy(mp, line, len); 719 mp[len] = '\0'; 720 line = mp; 721 } 722 cp = strtok(line, " \t"); 723 /* skip empty lines */ 724 if (cp == NULL) 725 goto nextline; 726 vhost = cp; 727 728 /* set defaults */ 729 anonuser = "ftp"; 730 statfile = _PATH_FTPDSTATFILE; 731 welcome = _PATH_FTPWELCOME; 732 loginmsg = _PATH_FTPLOGINMESG; 733 734 /* 735 * Preparse the line so we can use its info 736 * for all the addresses associated with 737 * the virtual host name. 738 * Field 0, the virtual host name, is special: 739 * it's already parsed off and will be strdup'ed 740 * later, after we know its canonical form. 741 */ 742 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 743 if (*cp != '-' && (cp = strdup(cp))) 744 switch (i) { 745 case 1: /* anon user permissions */ 746 anonuser = cp; 747 break; 748 case 2: /* statistics file */ 749 statfile = cp; 750 break; 751 case 3: /* welcome message */ 752 welcome = cp; 753 break; 754 case 4: /* login message */ 755 loginmsg = cp; 756 break; 757 default: /* programming error */ 758 abort(); 759 /* NOTREACHED */ 760 } 761 762 hints.ai_flags = 0; 763 hints.ai_family = AF_UNSPEC; 764 hints.ai_flags = AI_PASSIVE; 765 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 766 goto nextline; 767 for (ai = res; ai != NULL && ai->ai_addr != NULL; 768 ai = ai->ai_next) { 769 770 gothost = 0; 771 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 772 struct addrinfo *hi; 773 774 for (hi = hrp->hostinfo; hi != NULL; 775 hi = hi->ai_next) 776 if (hi->ai_addrlen == ai->ai_addrlen && 777 memcmp(hi->ai_addr, 778 ai->ai_addr, 779 ai->ai_addr->sa_len) == 0) { 780 gothost++; 781 break; 782 } 783 if (gothost) 784 break; 785 } 786 if (hrp == NULL) { 787 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 788 goto nextline; 789 hrp->hostname = NULL; 790 insert = 1; 791 } else { 792 if (hrp->hostinfo && hrp->hostinfo != res) 793 freeaddrinfo(hrp->hostinfo); 794 insert = 0; /* host already in the chain */ 795 } 796 hrp->hostinfo = res; 797 798 /* 799 * determine hostname to use. 800 * force defined name if there is a valid alias 801 * otherwise fallback to primary hostname 802 */ 803 /* XXX: getaddrinfo() can't do alias check */ 804 switch(hrp->hostinfo->ai_family) { 805 case AF_INET: 806 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 807 addrsize = sizeof(struct in_addr); 808 break; 809 case AF_INET6: 810 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 811 addrsize = sizeof(struct in6_addr); 812 break; 813 default: 814 /* should not reach here */ 815 freeaddrinfo(hrp->hostinfo); 816 if (insert) 817 free(hrp); /*not in chain, can free*/ 818 else 819 hrp->hostinfo = NULL; /*mark as blank*/ 820 goto nextline; 821 /* NOTREACHED */ 822 } 823 if ((hp = getipnodebyaddr(addr, addrsize, 824 hrp->hostinfo->ai_family, 825 &hp_error)) != NULL) { 826 if (strcmp(vhost, hp->h_name) != 0) { 827 if (hp->h_aliases == NULL) 828 vhost = hp->h_name; 829 else { 830 i = 0; 831 while (hp->h_aliases[i] && 832 strcmp(vhost, hp->h_aliases[i]) != 0) 833 ++i; 834 if (hp->h_aliases[i] == NULL) 835 vhost = hp->h_name; 836 } 837 } 838 } 839 if (hrp->hostname && 840 strcmp(hrp->hostname, vhost) != 0) { 841 free(hrp->hostname); 842 hrp->hostname = NULL; 843 } 844 if (hrp->hostname == NULL && 845 (hrp->hostname = strdup(vhost)) == NULL) { 846 freeaddrinfo(hrp->hostinfo); 847 hrp->hostinfo = NULL; /* mark as blank */ 848 if (hp) 849 freehostent(hp); 850 goto nextline; 851 } 852 hrp->anonuser = anonuser; 853 hrp->statfile = statfile; 854 hrp->welcome = welcome; 855 hrp->loginmsg = loginmsg; 856 if (insert) { 857 hrp->next = NULL; 858 lhrp->next = hrp; 859 lhrp = hrp; 860 } 861 if (hp) 862 freehostent(hp); 863 } 864 nextline: 865 if (mp) 866 free(mp); 867 } 868 (void) fclose(fp); 869 } 870 } 871 872 static void 873 selecthost(union sockunion *su) 874 { 875 struct ftphost *hrp; 876 u_int16_t port; 877 #ifdef INET6 878 struct in6_addr *mapped_in6 = NULL; 879 #endif 880 struct addrinfo *hi; 881 882 #ifdef INET6 883 /* 884 * XXX IPv4 mapped IPv6 addr consideraton, 885 * specified in rfc2373. 886 */ 887 if (su->su_family == AF_INET6 && 888 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 889 mapped_in6 = &su->su_sin6.sin6_addr; 890 #endif 891 892 hrp = thishost = firsthost; /* default */ 893 port = su->su_port; 894 su->su_port = 0; 895 while (hrp != NULL) { 896 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 897 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 898 thishost = hrp; 899 goto found; 900 } 901 #ifdef INET6 902 /* XXX IPv4 mapped IPv6 addr consideraton */ 903 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 904 (memcmp(&mapped_in6->s6_addr[12], 905 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 906 sizeof(struct in_addr)) == 0)) { 907 thishost = hrp; 908 goto found; 909 } 910 #endif 911 } 912 hrp = hrp->next; 913 } 914 found: 915 su->su_port = port; 916 /* setup static variables as appropriate */ 917 hostname = thishost->hostname; 918 ftpuser = thishost->anonuser; 919 } 920 #endif 921 922 /* 923 * Helper function for sgetpwnam(). 924 */ 925 static char * 926 sgetsave(char *s) 927 { 928 char *new = malloc(strlen(s) + 1); 929 930 if (new == NULL) { 931 reply(421, "Ran out of memory."); 932 dologout(1); 933 /* NOTREACHED */ 934 } 935 (void) strcpy(new, s); 936 return (new); 937 } 938 939 /* 940 * Save the result of a getpwnam. Used for USER command, since 941 * the data returned must not be clobbered by any other command 942 * (e.g., globbing). 943 * NB: The data returned by sgetpwnam() will remain valid until 944 * the next call to this function. Its difference from getpwnam() 945 * is that sgetpwnam() is known to be called from ftpd code only. 946 */ 947 static struct passwd * 948 sgetpwnam(char *name) 949 { 950 static struct passwd save; 951 struct passwd *p; 952 953 if ((p = getpwnam(name)) == NULL) 954 return (p); 955 if (save.pw_name) { 956 free(save.pw_name); 957 free(save.pw_passwd); 958 free(save.pw_gecos); 959 free(save.pw_dir); 960 free(save.pw_shell); 961 } 962 save = *p; 963 save.pw_name = sgetsave(p->pw_name); 964 save.pw_passwd = sgetsave(p->pw_passwd); 965 save.pw_gecos = sgetsave(p->pw_gecos); 966 save.pw_dir = sgetsave(p->pw_dir); 967 save.pw_shell = sgetsave(p->pw_shell); 968 return (&save); 969 } 970 971 static int login_attempts; /* number of failed login attempts */ 972 static int askpasswd; /* had user command, ask for passwd */ 973 static char curname[MAXLOGNAME]; /* current USER name */ 974 975 /* 976 * USER command. 977 * Sets global passwd pointer pw if named account exists and is acceptable; 978 * sets askpasswd if a PASS command is expected. If logged in previously, 979 * need to reset state. If name is "ftp" or "anonymous", the name is not in 980 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 981 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 982 * requesting login privileges. Disallow anyone who does not have a standard 983 * shell as returned by getusershell(). Disallow anyone mentioned in the file 984 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 985 */ 986 void 987 user(char *name) 988 { 989 char *cp, *shell; 990 991 if (logged_in) { 992 if (guest) { 993 reply(530, "Can't change user from guest login."); 994 return; 995 } else if (dochroot) { 996 reply(530, "Can't change user from chroot user."); 997 return; 998 } 999 end_login(); 1000 } 1001 1002 guest = 0; 1003 #ifdef VIRTUAL_HOSTING 1004 pw = sgetpwnam(thishost->anonuser); 1005 #else 1006 pw = sgetpwnam("ftp"); 1007 #endif 1008 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1009 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 1010 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 1011 reply(530, "User %s access denied.", name); 1012 else if (pw != NULL) { 1013 guest = 1; 1014 askpasswd = 1; 1015 reply(331, 1016 "Guest login ok, send your email address as password."); 1017 } else 1018 reply(530, "User %s unknown.", name); 1019 if (!askpasswd && logging) 1020 syslog(LOG_NOTICE, 1021 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1022 return; 1023 } 1024 if (anon_only != 0) { 1025 reply(530, "Sorry, only anonymous ftp allowed."); 1026 return; 1027 } 1028 1029 if ((pw = sgetpwnam(name))) { 1030 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1031 shell = _PATH_BSHELL; 1032 setusershell(); 1033 while ((cp = getusershell()) != NULL) 1034 if (strcmp(cp, shell) == 0) 1035 break; 1036 endusershell(); 1037 1038 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1039 reply(530, "User %s access denied.", name); 1040 if (logging) 1041 syslog(LOG_NOTICE, 1042 "FTP LOGIN REFUSED FROM %s, %s", 1043 remotehost, name); 1044 pw = NULL; 1045 return; 1046 } 1047 } 1048 if (logging) 1049 strncpy(curname, name, sizeof(curname)-1); 1050 1051 pwok = 0; 1052 #ifdef USE_PAM 1053 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1054 #endif 1055 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1056 pwok = (pw != NULL) && 1057 opieaccessfile(remotehost) && 1058 opiealways(pw->pw_dir); 1059 reply(331, "Response to %s %s for %s.", 1060 opieprompt, pwok ? "requested" : "required", name); 1061 } else { 1062 pwok = 1; 1063 reply(331, "Password required for %s.", name); 1064 } 1065 askpasswd = 1; 1066 /* 1067 * Delay before reading passwd after first failed 1068 * attempt to slow down passwd-guessing programs. 1069 */ 1070 if (login_attempts) 1071 sleep(login_attempts); 1072 } 1073 1074 /* 1075 * Check if a user is in the file "fname", 1076 * return a pointer to a malloc'd string with the rest 1077 * of the matching line in "residue" if not NULL. 1078 */ 1079 static int 1080 checkuser(char *fname, char *name, int pwset, char **residue) 1081 { 1082 FILE *fd; 1083 int found = 0; 1084 size_t len; 1085 char *line, *mp, *p; 1086 1087 if ((fd = fopen(fname, "r")) != NULL) { 1088 while (!found && (line = fgetln(fd, &len)) != NULL) { 1089 /* skip comments */ 1090 if (line[0] == '#') 1091 continue; 1092 if (line[len - 1] == '\n') { 1093 line[len - 1] = '\0'; 1094 mp = NULL; 1095 } else { 1096 if ((mp = malloc(len + 1)) == NULL) 1097 fatalerror("Ran out of memory."); 1098 memcpy(mp, line, len); 1099 mp[len] = '\0'; 1100 line = mp; 1101 } 1102 /* avoid possible leading and trailing whitespace */ 1103 p = strtok(line, " \t"); 1104 /* skip empty lines */ 1105 if (p == NULL) 1106 goto nextline; 1107 /* 1108 * if first chr is '@', check group membership 1109 */ 1110 if (p[0] == '@') { 1111 int i = 0; 1112 struct group *grp; 1113 1114 if (p[1] == '\0') /* single @ matches anyone */ 1115 found = 1; 1116 else { 1117 if ((grp = getgrnam(p+1)) == NULL) 1118 goto nextline; 1119 /* 1120 * Check user's default group 1121 */ 1122 if (pwset && grp->gr_gid == pw->pw_gid) 1123 found = 1; 1124 /* 1125 * Check supplementary groups 1126 */ 1127 while (!found && grp->gr_mem[i]) 1128 found = strcmp(name, 1129 grp->gr_mem[i++]) 1130 == 0; 1131 } 1132 } 1133 /* 1134 * Otherwise, just check for username match 1135 */ 1136 else 1137 found = strcmp(p, name) == 0; 1138 /* 1139 * Save the rest of line to "residue" if matched 1140 */ 1141 if (found && residue) { 1142 if ((p = strtok(NULL, "")) != NULL) 1143 p += strspn(p, " \t"); 1144 if (p && *p) { 1145 if ((*residue = strdup(p)) == NULL) 1146 fatalerror("Ran out of memory."); 1147 } else 1148 *residue = NULL; 1149 } 1150 nextline: 1151 if (mp) 1152 free(mp); 1153 } 1154 (void) fclose(fd); 1155 } 1156 return (found); 1157 } 1158 1159 /* 1160 * Terminate login as previous user, if any, resetting state; 1161 * used when USER command is given or login fails. 1162 */ 1163 static void 1164 end_login(void) 1165 { 1166 #ifdef USE_PAM 1167 int e; 1168 #endif 1169 1170 (void) seteuid(0); 1171 if (logged_in && dowtmp) 1172 ftpd_logwtmp(ttyline, "", NULL); 1173 pw = NULL; 1174 #ifdef LOGIN_CAP 1175 setusercontext(NULL, getpwuid(0), 0, 1176 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1177 LOGIN_SETMAC); 1178 #endif 1179 #ifdef USE_PAM 1180 if (pamh) { 1181 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1182 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1183 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1184 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1185 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1186 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1187 pamh = NULL; 1188 } 1189 #endif 1190 logged_in = 0; 1191 guest = 0; 1192 dochroot = 0; 1193 } 1194 1195 #ifdef USE_PAM 1196 1197 /* 1198 * the following code is stolen from imap-uw PAM authentication module and 1199 * login.c 1200 */ 1201 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1202 1203 struct cred_t { 1204 const char *uname; /* user name */ 1205 const char *pass; /* password */ 1206 }; 1207 typedef struct cred_t cred_t; 1208 1209 static int 1210 auth_conv(int num_msg, const struct pam_message **msg, 1211 struct pam_response **resp, void *appdata) 1212 { 1213 int i; 1214 cred_t *cred = (cred_t *) appdata; 1215 struct pam_response *reply; 1216 1217 reply = calloc(num_msg, sizeof *reply); 1218 if (reply == NULL) 1219 return PAM_BUF_ERR; 1220 1221 for (i = 0; i < num_msg; i++) { 1222 switch (msg[i]->msg_style) { 1223 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1224 reply[i].resp_retcode = PAM_SUCCESS; 1225 reply[i].resp = COPY_STRING(cred->uname); 1226 /* PAM frees resp. */ 1227 break; 1228 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1229 reply[i].resp_retcode = PAM_SUCCESS; 1230 reply[i].resp = COPY_STRING(cred->pass); 1231 /* PAM frees resp. */ 1232 break; 1233 case PAM_TEXT_INFO: 1234 case PAM_ERROR_MSG: 1235 reply[i].resp_retcode = PAM_SUCCESS; 1236 reply[i].resp = NULL; 1237 break; 1238 default: /* unknown message style */ 1239 free(reply); 1240 return PAM_CONV_ERR; 1241 } 1242 } 1243 1244 *resp = reply; 1245 return PAM_SUCCESS; 1246 } 1247 1248 /* 1249 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1250 * authenticated, or 1 if not authenticated. If some sort of PAM system 1251 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1252 * function returns -1. This can be used as an indication that we should 1253 * fall back to a different authentication mechanism. 1254 */ 1255 static int 1256 auth_pam(struct passwd **ppw, const char *pass) 1257 { 1258 const char *tmpl_user; 1259 const void *item; 1260 int rval; 1261 int e; 1262 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1263 struct pam_conv conv = { &auth_conv, &auth_cred }; 1264 1265 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1266 if (e != PAM_SUCCESS) { 1267 /* 1268 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1269 * if context creation has failed in the first place. 1270 */ 1271 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1272 return -1; 1273 } 1274 1275 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1276 if (e != PAM_SUCCESS) { 1277 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1278 pam_strerror(pamh, e)); 1279 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1280 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1281 } 1282 pamh = NULL; 1283 return -1; 1284 } 1285 1286 e = pam_authenticate(pamh, 0); 1287 switch (e) { 1288 case PAM_SUCCESS: 1289 /* 1290 * With PAM we support the concept of a "template" 1291 * user. The user enters a login name which is 1292 * authenticated by PAM, usually via a remote service 1293 * such as RADIUS or TACACS+. If authentication 1294 * succeeds, a different but related "template" name 1295 * is used for setting the credentials, shell, and 1296 * home directory. The name the user enters need only 1297 * exist on the remote authentication server, but the 1298 * template name must be present in the local password 1299 * database. 1300 * 1301 * This is supported by two various mechanisms in the 1302 * individual modules. However, from the application's 1303 * point of view, the template user is always passed 1304 * back as a changed value of the PAM_USER item. 1305 */ 1306 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1307 PAM_SUCCESS) { 1308 tmpl_user = (const char *) item; 1309 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1310 *ppw = getpwnam(tmpl_user); 1311 } else 1312 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1313 pam_strerror(pamh, e)); 1314 rval = 0; 1315 break; 1316 1317 case PAM_AUTH_ERR: 1318 case PAM_USER_UNKNOWN: 1319 case PAM_MAXTRIES: 1320 rval = 1; 1321 break; 1322 1323 default: 1324 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1325 rval = -1; 1326 break; 1327 } 1328 1329 if (rval == 0) { 1330 e = pam_acct_mgmt(pamh, 0); 1331 if (e != PAM_SUCCESS) { 1332 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1333 pam_strerror(pamh, e)); 1334 rval = 1; 1335 } 1336 } 1337 1338 if (rval != 0) { 1339 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1340 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1341 } 1342 pamh = NULL; 1343 } 1344 return rval; 1345 } 1346 1347 #endif /* USE_PAM */ 1348 1349 void 1350 pass(char *passwd) 1351 { 1352 int rval; 1353 FILE *fd; 1354 #ifdef LOGIN_CAP 1355 login_cap_t *lc = NULL; 1356 #endif 1357 #ifdef USE_PAM 1358 int e; 1359 #endif 1360 char *residue = NULL; 1361 char *xpasswd; 1362 1363 if (logged_in || askpasswd == 0) { 1364 reply(503, "Login with USER first."); 1365 return; 1366 } 1367 askpasswd = 0; 1368 if (!guest) { /* "ftp" is only account allowed no password */ 1369 if (pw == NULL) { 1370 rval = 1; /* failure below */ 1371 goto skip; 1372 } 1373 #ifdef USE_PAM 1374 rval = auth_pam(&pw, passwd); 1375 if (rval >= 0) { 1376 opieunlock(); 1377 goto skip; 1378 } 1379 #endif 1380 if (opieverify(&opiedata, passwd) == 0) 1381 xpasswd = pw->pw_passwd; 1382 else if (pwok) { 1383 xpasswd = crypt(passwd, pw->pw_passwd); 1384 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1385 xpasswd = ":"; 1386 } else { 1387 rval = 1; 1388 goto skip; 1389 } 1390 rval = strcmp(pw->pw_passwd, xpasswd); 1391 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1392 rval = 1; /* failure */ 1393 skip: 1394 /* 1395 * If rval == 1, the user failed the authentication check 1396 * above. If rval == 0, either PAM or local authentication 1397 * succeeded. 1398 */ 1399 if (rval) { 1400 reply(530, "Login incorrect."); 1401 if (logging) { 1402 syslog(LOG_NOTICE, 1403 "FTP LOGIN FAILED FROM %s", 1404 remotehost); 1405 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1406 "FTP LOGIN FAILED FROM %s, %s", 1407 remotehost, curname); 1408 } 1409 pw = NULL; 1410 if (login_attempts++ >= 5) { 1411 syslog(LOG_NOTICE, 1412 "repeated login failures from %s", 1413 remotehost); 1414 exit(0); 1415 } 1416 return; 1417 } 1418 } 1419 login_attempts = 0; /* this time successful */ 1420 if (setegid(pw->pw_gid) < 0) { 1421 reply(550, "Can't set gid."); 1422 return; 1423 } 1424 /* May be overridden by login.conf */ 1425 (void) umask(defumask); 1426 #ifdef LOGIN_CAP 1427 if ((lc = login_getpwclass(pw)) != NULL) { 1428 char remote_ip[NI_MAXHOST]; 1429 1430 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1431 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1432 NI_NUMERICHOST)) 1433 *remote_ip = 0; 1434 remote_ip[sizeof(remote_ip) - 1] = 0; 1435 if (!auth_hostok(lc, remotehost, remote_ip)) { 1436 syslog(LOG_INFO|LOG_AUTH, 1437 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1438 pw->pw_name); 1439 reply(530, "Permission denied."); 1440 pw = NULL; 1441 return; 1442 } 1443 if (!auth_timeok(lc, time(NULL))) { 1444 reply(530, "Login not available right now."); 1445 pw = NULL; 1446 return; 1447 } 1448 } 1449 setusercontext(lc, pw, 0, 1450 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1451 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1452 #else 1453 setlogin(pw->pw_name); 1454 (void) initgroups(pw->pw_name, pw->pw_gid); 1455 #endif 1456 1457 #ifdef USE_PAM 1458 if (pamh) { 1459 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1460 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1461 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1462 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1463 } 1464 } 1465 #endif 1466 1467 /* open wtmp before chroot */ 1468 if (dowtmp) 1469 ftpd_logwtmp(ttyline, pw->pw_name, 1470 (struct sockaddr *)&his_addr); 1471 logged_in = 1; 1472 1473 if (guest && stats && statfd < 0) 1474 #ifdef VIRTUAL_HOSTING 1475 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1476 #else 1477 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1478 #endif 1479 if (statfd < 0) 1480 stats = 0; 1481 1482 dochroot = 1483 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1484 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1485 || login_getcapbool(lc, "ftp-chroot", 0) 1486 #endif 1487 ; 1488 chrootdir = NULL; 1489 /* 1490 * For a chrooted local user, 1491 * a) see whether ftpchroot(5) specifies a chroot directory, 1492 * b) extract the directory pathname from the line, 1493 * c) expand it to the absolute pathname if necessary. 1494 */ 1495 if (dochroot && residue && 1496 (chrootdir = strtok(residue, " \t")) != NULL) { 1497 if (chrootdir[0] != '/') 1498 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1499 else 1500 chrootdir = strdup(chrootdir); /* make it permanent */ 1501 if (chrootdir == NULL) 1502 fatalerror("Ran out of memory."); 1503 } 1504 if (guest || dochroot) { 1505 /* 1506 * If no chroot directory set yet, use the login directory. 1507 * Copy it so it can be modified while pw->pw_dir stays intact. 1508 */ 1509 if (chrootdir == NULL && 1510 (chrootdir = strdup(pw->pw_dir)) == NULL) 1511 fatalerror("Ran out of memory."); 1512 /* 1513 * Check for the "/chroot/./home" syntax, 1514 * separate the chroot and home directory pathnames. 1515 */ 1516 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1517 *(homedir++) = '\0'; /* wipe '/' */ 1518 homedir++; /* skip '.' */ 1519 } else { 1520 /* 1521 * We MUST do a chdir() after the chroot. Otherwise 1522 * the old current directory will be accessible as "." 1523 * outside the new root! 1524 */ 1525 homedir = "/"; 1526 } 1527 /* 1528 * Finally, do chroot() 1529 */ 1530 if (chroot(chrootdir) < 0) { 1531 reply(550, "Can't change root."); 1532 goto bad; 1533 } 1534 } else /* real user w/o chroot */ 1535 homedir = pw->pw_dir; 1536 /* 1537 * Set euid *before* doing chdir() so 1538 * a) the user won't be carried to a directory that he couldn't reach 1539 * on his own due to no permission to upper path components, 1540 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1541 * (uid 0 has no root power over NFS if not mapped explicitly.) 1542 */ 1543 if (seteuid(pw->pw_uid) < 0) { 1544 reply(550, "Can't set uid."); 1545 goto bad; 1546 } 1547 if (chdir(homedir) < 0) { 1548 if (guest || dochroot) { 1549 reply(550, "Can't change to base directory."); 1550 goto bad; 1551 } else { 1552 if (chdir("/") < 0) { 1553 reply(550, "Root is inaccessible."); 1554 goto bad; 1555 } 1556 lreply(230, "No directory! Logging in with home=/."); 1557 } 1558 } 1559 1560 /* 1561 * Display a login message, if it exists. 1562 * N.B. reply(230,) must follow the message. 1563 */ 1564 #ifdef VIRTUAL_HOSTING 1565 fd = fopen(thishost->loginmsg, "r"); 1566 #else 1567 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1568 #endif 1569 if (fd != NULL) { 1570 char *cp, line[LINE_MAX]; 1571 1572 while (fgets(line, sizeof(line), fd) != NULL) { 1573 if ((cp = strchr(line, '\n')) != NULL) 1574 *cp = '\0'; 1575 lreply(230, "%s", line); 1576 } 1577 (void) fflush(stdout); 1578 (void) fclose(fd); 1579 } 1580 if (guest) { 1581 if (ident != NULL) 1582 free(ident); 1583 ident = strdup(passwd); 1584 if (ident == NULL) 1585 fatalerror("Ran out of memory."); 1586 1587 reply(230, "Guest login ok, access restrictions apply."); 1588 #ifdef SETPROCTITLE 1589 #ifdef VIRTUAL_HOSTING 1590 if (thishost != firsthost) 1591 snprintf(proctitle, sizeof(proctitle), 1592 "%s: anonymous(%s)/%s", remotehost, hostname, 1593 passwd); 1594 else 1595 #endif 1596 snprintf(proctitle, sizeof(proctitle), 1597 "%s: anonymous/%s", remotehost, passwd); 1598 setproctitle("%s", proctitle); 1599 #endif /* SETPROCTITLE */ 1600 if (logging) 1601 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1602 remotehost, passwd); 1603 } else { 1604 if (dochroot) 1605 reply(230, "User %s logged in, " 1606 "access restrictions apply.", pw->pw_name); 1607 else 1608 reply(230, "User %s logged in.", pw->pw_name); 1609 1610 #ifdef SETPROCTITLE 1611 snprintf(proctitle, sizeof(proctitle), 1612 "%s: user/%s", remotehost, pw->pw_name); 1613 setproctitle("%s", proctitle); 1614 #endif /* SETPROCTITLE */ 1615 if (logging) 1616 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1617 remotehost, pw->pw_name); 1618 } 1619 if (logging && (guest || dochroot)) 1620 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1621 #ifdef LOGIN_CAP 1622 login_close(lc); 1623 #endif 1624 if (residue) 1625 free(residue); 1626 return; 1627 bad: 1628 /* Forget all about it... */ 1629 #ifdef LOGIN_CAP 1630 login_close(lc); 1631 #endif 1632 if (residue) 1633 free(residue); 1634 end_login(); 1635 } 1636 1637 void 1638 retrieve(char *cmd, char *name) 1639 { 1640 FILE *fin, *dout; 1641 struct stat st; 1642 int (*closefunc)(FILE *); 1643 time_t start; 1644 1645 if (cmd == 0) { 1646 fin = fopen(name, "r"), closefunc = fclose; 1647 st.st_size = 0; 1648 } else { 1649 char line[BUFSIZ]; 1650 1651 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1652 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1653 st.st_size = -1; 1654 st.st_blksize = BUFSIZ; 1655 } 1656 if (fin == NULL) { 1657 if (errno != 0) { 1658 perror_reply(550, name); 1659 if (cmd == 0) { 1660 LOGCMD("get", name); 1661 } 1662 } 1663 return; 1664 } 1665 byte_count = -1; 1666 if (cmd == 0) { 1667 if (fstat(fileno(fin), &st) < 0) { 1668 perror_reply(550, name); 1669 goto done; 1670 } 1671 if (!S_ISREG(st.st_mode)) { 1672 /* 1673 * Never sending a raw directory is a workaround 1674 * for buggy clients that will attempt to RETR 1675 * a directory before listing it, e.g., Mozilla. 1676 * Preventing a guest from getting irregular files 1677 * is a simple security measure. 1678 */ 1679 if (S_ISDIR(st.st_mode) || guest) { 1680 reply(550, "%s: not a plain file.", name); 1681 goto done; 1682 } 1683 st.st_size = -1; 1684 /* st.st_blksize is set for all descriptor types */ 1685 } 1686 } 1687 if (restart_point) { 1688 if (type == TYPE_A) { 1689 off_t i, n; 1690 int c; 1691 1692 n = restart_point; 1693 i = 0; 1694 while (i++ < n) { 1695 if ((c=getc(fin)) == EOF) { 1696 perror_reply(550, name); 1697 goto done; 1698 } 1699 if (c == '\n') 1700 i++; 1701 } 1702 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1703 perror_reply(550, name); 1704 goto done; 1705 } 1706 } 1707 dout = dataconn(name, st.st_size, "w"); 1708 if (dout == NULL) 1709 goto done; 1710 time(&start); 1711 send_data(fin, dout, st.st_blksize, st.st_size, 1712 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1713 if (cmd == 0 && guest && stats && byte_count > 0) 1714 logxfer(name, byte_count, start); 1715 (void) fclose(dout); 1716 data = -1; 1717 pdata = -1; 1718 done: 1719 if (cmd == 0) 1720 LOGBYTES("get", name, byte_count); 1721 (*closefunc)(fin); 1722 } 1723 1724 void 1725 store(char *name, char *mode, int unique) 1726 { 1727 int fd; 1728 FILE *fout, *din; 1729 int (*closefunc)(FILE *); 1730 1731 if (*mode == 'a') { /* APPE */ 1732 if (unique) { 1733 /* Programming error */ 1734 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1735 unique = 0; 1736 } 1737 if (guest && noguestmod) { 1738 reply(550, "Appending to existing file denied."); 1739 goto err; 1740 } 1741 restart_point = 0; /* not affected by preceding REST */ 1742 } 1743 if (unique) /* STOU overrides REST */ 1744 restart_point = 0; 1745 if (guest && noguestmod) { 1746 if (restart_point) { /* guest STOR w/REST */ 1747 reply(550, "Modifying existing file denied."); 1748 goto err; 1749 } else /* treat guest STOR as STOU */ 1750 unique = 1; 1751 } 1752 1753 if (restart_point) 1754 mode = "r+"; /* so ASCII manual seek can work */ 1755 if (unique) { 1756 if ((fd = guniquefd(name, &name)) < 0) 1757 goto err; 1758 fout = fdopen(fd, mode); 1759 } else 1760 fout = fopen(name, mode); 1761 closefunc = fclose; 1762 if (fout == NULL) { 1763 perror_reply(553, name); 1764 goto err; 1765 } 1766 byte_count = -1; 1767 if (restart_point) { 1768 if (type == TYPE_A) { 1769 off_t i, n; 1770 int c; 1771 1772 n = restart_point; 1773 i = 0; 1774 while (i++ < n) { 1775 if ((c=getc(fout)) == EOF) { 1776 perror_reply(550, name); 1777 goto done; 1778 } 1779 if (c == '\n') 1780 i++; 1781 } 1782 /* 1783 * We must do this seek to "current" position 1784 * because we are changing from reading to 1785 * writing. 1786 */ 1787 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1788 perror_reply(550, name); 1789 goto done; 1790 } 1791 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1792 perror_reply(550, name); 1793 goto done; 1794 } 1795 } 1796 din = dataconn(name, -1, "r"); 1797 if (din == NULL) 1798 goto done; 1799 if (receive_data(din, fout) == 0) { 1800 if (unique) 1801 reply(226, "Transfer complete (unique file name:%s).", 1802 name); 1803 else 1804 reply(226, "Transfer complete."); 1805 } 1806 (void) fclose(din); 1807 data = -1; 1808 pdata = -1; 1809 done: 1810 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1811 (*closefunc)(fout); 1812 return; 1813 err: 1814 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1815 return; 1816 } 1817 1818 static FILE * 1819 getdatasock(char *mode) 1820 { 1821 int on = 1, s, t, tries; 1822 1823 if (data >= 0) 1824 return (fdopen(data, mode)); 1825 1826 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1827 if (s < 0) 1828 goto bad; 1829 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1830 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1831 /* anchor socket to avoid multi-homing problems */ 1832 data_source = ctrl_addr; 1833 data_source.su_port = htons(dataport); 1834 (void) seteuid(0); 1835 for (tries = 1; ; tries++) { 1836 /* 1837 * We should loop here since it's possible that 1838 * another ftpd instance has passed this point and is 1839 * trying to open a data connection in active mode now. 1840 * Until the other connection is opened, we'll be getting 1841 * EADDRINUSE because no SOCK_STREAM sockets in the system 1842 * can share both local and remote addresses, localIP:20 1843 * and *:* in this case. 1844 */ 1845 if (bind(s, (struct sockaddr *)&data_source, 1846 data_source.su_len) >= 0) 1847 break; 1848 if (errno != EADDRINUSE || tries > 10) 1849 goto bad; 1850 sleep(tries); 1851 } 1852 (void) seteuid(pw->pw_uid); 1853 #ifdef IP_TOS 1854 if (data_source.su_family == AF_INET) 1855 { 1856 on = IPTOS_THROUGHPUT; 1857 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1858 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1859 } 1860 #endif 1861 #ifdef TCP_NOPUSH 1862 /* 1863 * Turn off push flag to keep sender TCP from sending short packets 1864 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1865 * to set the send buffer size as well, but that may not be desirable 1866 * in heavy-load situations. 1867 */ 1868 on = 1; 1869 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1870 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1871 #endif 1872 #ifdef SO_SNDBUF 1873 on = 65536; 1874 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1875 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1876 #endif 1877 1878 return (fdopen(s, mode)); 1879 bad: 1880 /* Return the real value of errno (close may change it) */ 1881 t = errno; 1882 (void) seteuid(pw->pw_uid); 1883 (void) close(s); 1884 errno = t; 1885 return (NULL); 1886 } 1887 1888 static FILE * 1889 dataconn(char *name, off_t size, char *mode) 1890 { 1891 char sizebuf[32]; 1892 FILE *file; 1893 int retry = 0, tos, conerrno; 1894 1895 file_size = size; 1896 byte_count = 0; 1897 if (size != -1) 1898 (void) snprintf(sizebuf, sizeof(sizebuf), 1899 " (%jd bytes)", (intmax_t)size); 1900 else 1901 *sizebuf = '\0'; 1902 if (pdata >= 0) { 1903 union sockunion from; 1904 socklen_t fromlen = ctrl_addr.su_len; 1905 int flags, s; 1906 struct timeval timeout; 1907 fd_set set; 1908 1909 FD_ZERO(&set); 1910 FD_SET(pdata, &set); 1911 1912 timeout.tv_usec = 0; 1913 timeout.tv_sec = 120; 1914 1915 /* 1916 * Granted a socket is in the blocking I/O mode, 1917 * accept() will block after a successful select() 1918 * if the selected connection dies in between. 1919 * Therefore set the non-blocking I/O flag here. 1920 */ 1921 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1922 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1923 goto pdata_err; 1924 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1925 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1926 goto pdata_err; 1927 (void) close(pdata); 1928 pdata = s; 1929 /* 1930 * Unset the inherited non-blocking I/O flag 1931 * on the child socket so stdio can work on it. 1932 */ 1933 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1934 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1935 goto pdata_err; 1936 #ifdef IP_TOS 1937 if (from.su_family == AF_INET) 1938 { 1939 tos = IPTOS_THROUGHPUT; 1940 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1941 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1942 } 1943 #endif 1944 reply(150, "Opening %s mode data connection for '%s'%s.", 1945 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1946 return (fdopen(pdata, mode)); 1947 pdata_err: 1948 reply(425, "Can't open data connection."); 1949 (void) close(pdata); 1950 pdata = -1; 1951 return (NULL); 1952 } 1953 if (data >= 0) { 1954 reply(125, "Using existing data connection for '%s'%s.", 1955 name, sizebuf); 1956 usedefault = 1; 1957 return (fdopen(data, mode)); 1958 } 1959 if (usedefault) 1960 data_dest = his_addr; 1961 usedefault = 1; 1962 do { 1963 file = getdatasock(mode); 1964 if (file == NULL) { 1965 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1966 1967 if (getnameinfo((struct sockaddr *)&data_source, 1968 data_source.su_len, 1969 hostbuf, sizeof(hostbuf) - 1, 1970 portbuf, sizeof(portbuf) - 1, 1971 NI_NUMERICHOST|NI_NUMERICSERV)) 1972 *hostbuf = *portbuf = 0; 1973 hostbuf[sizeof(hostbuf) - 1] = 0; 1974 portbuf[sizeof(portbuf) - 1] = 0; 1975 reply(425, "Can't create data socket (%s,%s): %s.", 1976 hostbuf, portbuf, strerror(errno)); 1977 return (NULL); 1978 } 1979 data = fileno(file); 1980 conerrno = 0; 1981 if (connect(data, (struct sockaddr *)&data_dest, 1982 data_dest.su_len) == 0) 1983 break; 1984 conerrno = errno; 1985 (void) fclose(file); 1986 data = -1; 1987 if (conerrno == EADDRINUSE) { 1988 sleep(swaitint); 1989 retry += swaitint; 1990 } else { 1991 break; 1992 } 1993 } while (retry <= swaitmax); 1994 if (conerrno != 0) { 1995 reply(425, "Can't build data connection: %s.", 1996 strerror(conerrno)); 1997 return (NULL); 1998 } 1999 reply(150, "Opening %s mode data connection for '%s'%s.", 2000 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2001 return (file); 2002 } 2003 2004 /* 2005 * A helper macro to avoid code duplication 2006 * in send_data() and receive_data(). 2007 * 2008 * XXX We have to block SIGURG during putc() because BSD stdio 2009 * is unable to restart interrupted write operations and hence 2010 * the entire buffer contents will be lost as soon as a write() 2011 * call indicates EINTR to stdio. 2012 */ 2013 #define FTPD_PUTC(ch, file, label) \ 2014 do { \ 2015 int ret; \ 2016 \ 2017 do { \ 2018 START_UNSAFE; \ 2019 ret = putc((ch), (file)); \ 2020 END_UNSAFE; \ 2021 CHECKOOB(return (-1)) \ 2022 else if (ferror(file)) \ 2023 goto label; \ 2024 clearerr(file); \ 2025 } while (ret == EOF); \ 2026 } while (0) 2027 2028 /* 2029 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2030 * encapsulation of the data subject to Mode, Structure, and Type. 2031 * 2032 * NB: Form isn't handled. 2033 */ 2034 static int 2035 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2036 { 2037 int c, cp, filefd, netfd; 2038 char *buf; 2039 2040 STARTXFER; 2041 2042 switch (type) { 2043 2044 case TYPE_A: 2045 cp = EOF; 2046 for (;;) { 2047 c = getc(instr); 2048 CHECKOOB(return (-1)) 2049 else if (c == EOF && ferror(instr)) 2050 goto file_err; 2051 if (c == EOF) { 2052 if (ferror(instr)) { /* resume after OOB */ 2053 clearerr(instr); 2054 continue; 2055 } 2056 if (feof(instr)) /* EOF */ 2057 break; 2058 syslog(LOG_ERR, "Internal: impossible condition" 2059 " on file after getc()"); 2060 goto file_err; 2061 } 2062 if (c == '\n' && cp != '\r') { 2063 FTPD_PUTC('\r', outstr, data_err); 2064 byte_count++; 2065 } 2066 FTPD_PUTC(c, outstr, data_err); 2067 byte_count++; 2068 cp = c; 2069 } 2070 #ifdef notyet /* BSD stdio isn't ready for that */ 2071 while (fflush(outstr) == EOF) { 2072 CHECKOOB(return (-1)) 2073 else 2074 goto data_err; 2075 clearerr(outstr); 2076 } 2077 ENDXFER; 2078 #else 2079 ENDXFER; 2080 if (fflush(outstr) == EOF) 2081 goto data_err; 2082 #endif 2083 reply(226, "Transfer complete."); 2084 return (0); 2085 2086 case TYPE_I: 2087 case TYPE_L: 2088 /* 2089 * isreg is only set if we are not doing restart and we 2090 * are sending a regular file 2091 */ 2092 netfd = fileno(outstr); 2093 filefd = fileno(instr); 2094 2095 if (isreg) { 2096 char *msg = "Transfer complete."; 2097 off_t cnt, offset; 2098 int err; 2099 2100 cnt = offset = 0; 2101 2102 while (filesize > 0) { 2103 err = sendfile(filefd, netfd, offset, 0, 2104 NULL, &cnt, 0); 2105 /* 2106 * Calculate byte_count before OOB processing. 2107 * It can be used in myoob() later. 2108 */ 2109 byte_count += cnt; 2110 offset += cnt; 2111 filesize -= cnt; 2112 CHECKOOB(return (-1)) 2113 else if (err == -1) { 2114 if (errno != EINTR && 2115 cnt == 0 && offset == 0) 2116 goto oldway; 2117 goto data_err; 2118 } 2119 if (err == -1) /* resume after OOB */ 2120 continue; 2121 /* 2122 * We hit the EOF prematurely. 2123 * Perhaps the file was externally truncated. 2124 */ 2125 if (cnt == 0) { 2126 msg = "Transfer finished due to " 2127 "premature end of file."; 2128 break; 2129 } 2130 } 2131 ENDXFER; 2132 reply(226, msg); 2133 return (0); 2134 } 2135 2136 oldway: 2137 if ((buf = malloc(blksize)) == NULL) { 2138 ENDXFER; 2139 reply(451, "Ran out of memory."); 2140 return (-1); 2141 } 2142 2143 for (;;) { 2144 int cnt, len; 2145 char *bp; 2146 2147 cnt = read(filefd, buf, blksize); 2148 CHECKOOB(free(buf); return (-1)) 2149 else if (cnt < 0) { 2150 free(buf); 2151 goto file_err; 2152 } 2153 if (cnt < 0) /* resume after OOB */ 2154 continue; 2155 if (cnt == 0) /* EOF */ 2156 break; 2157 for (len = cnt, bp = buf; len > 0;) { 2158 cnt = write(netfd, bp, len); 2159 CHECKOOB(free(buf); return (-1)) 2160 else if (cnt < 0) { 2161 free(buf); 2162 goto data_err; 2163 } 2164 if (cnt <= 0) 2165 continue; 2166 len -= cnt; 2167 bp += cnt; 2168 byte_count += cnt; 2169 } 2170 } 2171 ENDXFER; 2172 free(buf); 2173 reply(226, "Transfer complete."); 2174 return (0); 2175 default: 2176 ENDXFER; 2177 reply(550, "Unimplemented TYPE %d in send_data.", type); 2178 return (-1); 2179 } 2180 2181 data_err: 2182 ENDXFER; 2183 perror_reply(426, "Data connection"); 2184 return (-1); 2185 2186 file_err: 2187 ENDXFER; 2188 perror_reply(551, "Error on input file"); 2189 return (-1); 2190 } 2191 2192 /* 2193 * Transfer data from peer to "outstr" using the appropriate encapulation of 2194 * the data subject to Mode, Structure, and Type. 2195 * 2196 * N.B.: Form isn't handled. 2197 */ 2198 static int 2199 receive_data(FILE *instr, FILE *outstr) 2200 { 2201 int c, cp; 2202 int bare_lfs = 0; 2203 2204 STARTXFER; 2205 2206 switch (type) { 2207 2208 case TYPE_I: 2209 case TYPE_L: 2210 for (;;) { 2211 int cnt, len; 2212 char *bp; 2213 char buf[BUFSIZ]; 2214 2215 cnt = read(fileno(instr), buf, sizeof(buf)); 2216 CHECKOOB(return (-1)) 2217 else if (cnt < 0) 2218 goto data_err; 2219 if (cnt < 0) /* resume after OOB */ 2220 continue; 2221 if (cnt == 0) /* EOF */ 2222 break; 2223 for (len = cnt, bp = buf; len > 0;) { 2224 cnt = write(fileno(outstr), bp, len); 2225 CHECKOOB(return (-1)) 2226 else if (cnt < 0) 2227 goto file_err; 2228 if (cnt <= 0) 2229 continue; 2230 len -= cnt; 2231 bp += cnt; 2232 byte_count += cnt; 2233 } 2234 } 2235 ENDXFER; 2236 return (0); 2237 2238 case TYPE_E: 2239 ENDXFER; 2240 reply(553, "TYPE E not implemented."); 2241 return (-1); 2242 2243 case TYPE_A: 2244 cp = EOF; 2245 for (;;) { 2246 c = getc(instr); 2247 CHECKOOB(return (-1)) 2248 else if (c == EOF && ferror(instr)) 2249 goto data_err; 2250 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2251 clearerr(instr); 2252 continue; 2253 } 2254 2255 if (cp == '\r') { 2256 if (c != '\n') 2257 FTPD_PUTC('\r', outstr, file_err); 2258 } else 2259 if (c == '\n') 2260 bare_lfs++; 2261 if (c == '\r') { 2262 byte_count++; 2263 cp = c; 2264 continue; 2265 } 2266 2267 /* Check for EOF here in order not to lose last \r. */ 2268 if (c == EOF) { 2269 if (feof(instr)) /* EOF */ 2270 break; 2271 syslog(LOG_ERR, "Internal: impossible condition" 2272 " on data stream after getc()"); 2273 goto data_err; 2274 } 2275 2276 byte_count++; 2277 FTPD_PUTC(c, outstr, file_err); 2278 cp = c; 2279 } 2280 #ifdef notyet /* BSD stdio isn't ready for that */ 2281 while (fflush(outstr) == EOF) { 2282 CHECKOOB(return (-1)) 2283 else 2284 goto file_err; 2285 clearerr(outstr); 2286 } 2287 ENDXFER; 2288 #else 2289 ENDXFER; 2290 if (fflush(outstr) == EOF) 2291 goto file_err; 2292 #endif 2293 if (bare_lfs) { 2294 lreply(226, 2295 "WARNING! %d bare linefeeds received in ASCII mode.", 2296 bare_lfs); 2297 (void)printf(" File may not have transferred correctly.\r\n"); 2298 } 2299 return (0); 2300 default: 2301 ENDXFER; 2302 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2303 return (-1); 2304 } 2305 2306 data_err: 2307 ENDXFER; 2308 perror_reply(426, "Data connection"); 2309 return (-1); 2310 2311 file_err: 2312 ENDXFER; 2313 perror_reply(452, "Error writing to file"); 2314 return (-1); 2315 } 2316 2317 void 2318 statfilecmd(char *filename) 2319 { 2320 FILE *fin; 2321 int atstart; 2322 int c, code; 2323 char line[LINE_MAX]; 2324 struct stat st; 2325 2326 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2327 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2328 fin = ftpd_popen(line, "r"); 2329 lreply(code, "Status of %s:", filename); 2330 atstart = 1; 2331 while ((c = getc(fin)) != EOF) { 2332 if (c == '\n') { 2333 if (ferror(stdout)){ 2334 perror_reply(421, "Control connection"); 2335 (void) ftpd_pclose(fin); 2336 dologout(1); 2337 /* NOTREACHED */ 2338 } 2339 if (ferror(fin)) { 2340 perror_reply(551, filename); 2341 (void) ftpd_pclose(fin); 2342 return; 2343 } 2344 (void) putc('\r', stdout); 2345 } 2346 /* 2347 * RFC 959 says neutral text should be prepended before 2348 * a leading 3-digit number followed by whitespace, but 2349 * many ftp clients can be confused by any leading digits, 2350 * as a matter of fact. 2351 */ 2352 if (atstart && isdigit(c)) 2353 (void) putc(' ', stdout); 2354 (void) putc(c, stdout); 2355 atstart = (c == '\n'); 2356 } 2357 (void) ftpd_pclose(fin); 2358 reply(code, "End of status."); 2359 } 2360 2361 void 2362 statcmd(void) 2363 { 2364 union sockunion *su; 2365 u_char *a, *p; 2366 char hname[NI_MAXHOST]; 2367 int ispassive; 2368 2369 if (hostinfo) { 2370 lreply(211, "%s FTP server status:", hostname); 2371 printf(" %s\r\n", version); 2372 } else 2373 lreply(211, "FTP server status:"); 2374 printf(" Connected to %s", remotehost); 2375 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2376 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2377 hname[sizeof(hname) - 1] = 0; 2378 if (strcmp(hname, remotehost) != 0) 2379 printf(" (%s)", hname); 2380 } 2381 printf("\r\n"); 2382 if (logged_in) { 2383 if (guest) 2384 printf(" Logged in anonymously\r\n"); 2385 else 2386 printf(" Logged in as %s\r\n", pw->pw_name); 2387 } else if (askpasswd) 2388 printf(" Waiting for password\r\n"); 2389 else 2390 printf(" Waiting for user name\r\n"); 2391 printf(" TYPE: %s", typenames[type]); 2392 if (type == TYPE_A || type == TYPE_E) 2393 printf(", FORM: %s", formnames[form]); 2394 if (type == TYPE_L) 2395 #if CHAR_BIT == 8 2396 printf(" %d", CHAR_BIT); 2397 #else 2398 printf(" %d", bytesize); /* need definition! */ 2399 #endif 2400 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2401 strunames[stru], modenames[mode]); 2402 if (data != -1) 2403 printf(" Data connection open\r\n"); 2404 else if (pdata != -1) { 2405 ispassive = 1; 2406 su = &pasv_addr; 2407 goto printaddr; 2408 } else if (usedefault == 0) { 2409 ispassive = 0; 2410 su = &data_dest; 2411 printaddr: 2412 #define UC(b) (((int) b) & 0xff) 2413 if (epsvall) { 2414 printf(" EPSV only mode (EPSV ALL)\r\n"); 2415 goto epsvonly; 2416 } 2417 2418 /* PORT/PASV */ 2419 if (su->su_family == AF_INET) { 2420 a = (u_char *) &su->su_sin.sin_addr; 2421 p = (u_char *) &su->su_sin.sin_port; 2422 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2423 ispassive ? "PASV" : "PORT", 2424 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2425 UC(p[0]), UC(p[1])); 2426 } 2427 2428 /* LPRT/LPSV */ 2429 { 2430 int alen, af, i; 2431 2432 switch (su->su_family) { 2433 case AF_INET: 2434 a = (u_char *) &su->su_sin.sin_addr; 2435 p = (u_char *) &su->su_sin.sin_port; 2436 alen = sizeof(su->su_sin.sin_addr); 2437 af = 4; 2438 break; 2439 case AF_INET6: 2440 a = (u_char *) &su->su_sin6.sin6_addr; 2441 p = (u_char *) &su->su_sin6.sin6_port; 2442 alen = sizeof(su->su_sin6.sin6_addr); 2443 af = 6; 2444 break; 2445 default: 2446 af = 0; 2447 break; 2448 } 2449 if (af) { 2450 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2451 af, alen); 2452 for (i = 0; i < alen; i++) 2453 printf("%d,", UC(a[i])); 2454 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2455 } 2456 } 2457 2458 epsvonly:; 2459 /* EPRT/EPSV */ 2460 { 2461 int af; 2462 2463 switch (su->su_family) { 2464 case AF_INET: 2465 af = 1; 2466 break; 2467 case AF_INET6: 2468 af = 2; 2469 break; 2470 default: 2471 af = 0; 2472 break; 2473 } 2474 if (af) { 2475 union sockunion tmp; 2476 2477 tmp = *su; 2478 if (tmp.su_family == AF_INET6) 2479 tmp.su_sin6.sin6_scope_id = 0; 2480 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2481 hname, sizeof(hname) - 1, NULL, 0, 2482 NI_NUMERICHOST)) { 2483 hname[sizeof(hname) - 1] = 0; 2484 printf(" %s |%d|%s|%d|\r\n", 2485 ispassive ? "EPSV" : "EPRT", 2486 af, hname, htons(tmp.su_port)); 2487 } 2488 } 2489 } 2490 #undef UC 2491 } else 2492 printf(" No data connection\r\n"); 2493 reply(211, "End of status."); 2494 } 2495 2496 void 2497 fatalerror(char *s) 2498 { 2499 2500 reply(451, "Error in server: %s", s); 2501 reply(221, "Closing connection due to server error."); 2502 dologout(0); 2503 /* NOTREACHED */ 2504 } 2505 2506 void 2507 reply(int n, const char *fmt, ...) 2508 { 2509 va_list ap; 2510 2511 (void)printf("%d ", n); 2512 va_start(ap, fmt); 2513 (void)vprintf(fmt, ap); 2514 va_end(ap); 2515 (void)printf("\r\n"); 2516 (void)fflush(stdout); 2517 if (ftpdebug) { 2518 syslog(LOG_DEBUG, "<--- %d ", n); 2519 va_start(ap, fmt); 2520 vsyslog(LOG_DEBUG, fmt, ap); 2521 va_end(ap); 2522 } 2523 } 2524 2525 void 2526 lreply(int n, const char *fmt, ...) 2527 { 2528 va_list ap; 2529 2530 (void)printf("%d- ", n); 2531 va_start(ap, fmt); 2532 (void)vprintf(fmt, ap); 2533 va_end(ap); 2534 (void)printf("\r\n"); 2535 (void)fflush(stdout); 2536 if (ftpdebug) { 2537 syslog(LOG_DEBUG, "<--- %d- ", n); 2538 va_start(ap, fmt); 2539 vsyslog(LOG_DEBUG, fmt, ap); 2540 va_end(ap); 2541 } 2542 } 2543 2544 static void 2545 ack(char *s) 2546 { 2547 2548 reply(250, "%s command successful.", s); 2549 } 2550 2551 void 2552 nack(char *s) 2553 { 2554 2555 reply(502, "%s command not implemented.", s); 2556 } 2557 2558 /* ARGSUSED */ 2559 void 2560 yyerror(char *s) 2561 { 2562 char *cp; 2563 2564 if ((cp = strchr(cbuf,'\n'))) 2565 *cp = '\0'; 2566 reply(500, "%s: command not understood.", cbuf); 2567 } 2568 2569 void 2570 delete(char *name) 2571 { 2572 struct stat st; 2573 2574 LOGCMD("delete", name); 2575 if (lstat(name, &st) < 0) { 2576 perror_reply(550, name); 2577 return; 2578 } 2579 if (S_ISDIR(st.st_mode)) { 2580 if (rmdir(name) < 0) { 2581 perror_reply(550, name); 2582 return; 2583 } 2584 goto done; 2585 } 2586 if (guest && noguestmod) { 2587 reply(550, "Operation not permitted."); 2588 return; 2589 } 2590 if (unlink(name) < 0) { 2591 perror_reply(550, name); 2592 return; 2593 } 2594 done: 2595 ack("DELE"); 2596 } 2597 2598 void 2599 cwd(char *path) 2600 { 2601 2602 if (chdir(path) < 0) 2603 perror_reply(550, path); 2604 else 2605 ack("CWD"); 2606 } 2607 2608 void 2609 makedir(char *name) 2610 { 2611 char *s; 2612 2613 LOGCMD("mkdir", name); 2614 if (guest && noguestmkd) 2615 reply(550, "Operation not permitted."); 2616 else if (mkdir(name, 0777) < 0) 2617 perror_reply(550, name); 2618 else { 2619 if ((s = doublequote(name)) == NULL) 2620 fatalerror("Ran out of memory."); 2621 reply(257, "\"%s\" directory created.", s); 2622 free(s); 2623 } 2624 } 2625 2626 void 2627 removedir(char *name) 2628 { 2629 2630 LOGCMD("rmdir", name); 2631 if (rmdir(name) < 0) 2632 perror_reply(550, name); 2633 else 2634 ack("RMD"); 2635 } 2636 2637 void 2638 pwd(void) 2639 { 2640 char *s, path[MAXPATHLEN + 1]; 2641 2642 if (getcwd(path, sizeof(path)) == NULL) 2643 perror_reply(550, "Get current directory"); 2644 else { 2645 if ((s = doublequote(path)) == NULL) 2646 fatalerror("Ran out of memory."); 2647 reply(257, "\"%s\" is current directory.", s); 2648 free(s); 2649 } 2650 } 2651 2652 char * 2653 renamefrom(char *name) 2654 { 2655 struct stat st; 2656 2657 if (guest && noguestmod) { 2658 reply(550, "Operation not permitted."); 2659 return (NULL); 2660 } 2661 if (lstat(name, &st) < 0) { 2662 perror_reply(550, name); 2663 return (NULL); 2664 } 2665 reply(350, "File exists, ready for destination name."); 2666 return (name); 2667 } 2668 2669 void 2670 renamecmd(char *from, char *to) 2671 { 2672 struct stat st; 2673 2674 LOGCMD2("rename", from, to); 2675 2676 if (guest && (stat(to, &st) == 0)) { 2677 reply(550, "%s: permission denied.", to); 2678 return; 2679 } 2680 2681 if (rename(from, to) < 0) 2682 perror_reply(550, "rename"); 2683 else 2684 ack("RNTO"); 2685 } 2686 2687 static void 2688 dolog(struct sockaddr *who) 2689 { 2690 char who_name[NI_MAXHOST]; 2691 2692 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2693 remotehost[sizeof(remotehost) - 1] = 0; 2694 if (getnameinfo(who, who->sa_len, 2695 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2696 *who_name = 0; 2697 who_name[sizeof(who_name) - 1] = 0; 2698 2699 #ifdef SETPROCTITLE 2700 #ifdef VIRTUAL_HOSTING 2701 if (thishost != firsthost) 2702 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2703 remotehost, hostname); 2704 else 2705 #endif 2706 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2707 remotehost); 2708 setproctitle("%s", proctitle); 2709 #endif /* SETPROCTITLE */ 2710 2711 if (logging) { 2712 #ifdef VIRTUAL_HOSTING 2713 if (thishost != firsthost) 2714 syslog(LOG_INFO, "connection from %s (%s) to %s", 2715 remotehost, who_name, hostname); 2716 else 2717 #endif 2718 syslog(LOG_INFO, "connection from %s (%s)", 2719 remotehost, who_name); 2720 } 2721 } 2722 2723 /* 2724 * Record logout in wtmp file 2725 * and exit with supplied status. 2726 */ 2727 void 2728 dologout(int status) 2729 { 2730 2731 if (logged_in && dowtmp) { 2732 (void) seteuid(0); 2733 ftpd_logwtmp(ttyline, "", NULL); 2734 } 2735 /* beware of flushing buffers after a SIGPIPE */ 2736 _exit(status); 2737 } 2738 2739 static void 2740 sigurg(int signo) 2741 { 2742 2743 recvurg = 1; 2744 } 2745 2746 static void 2747 maskurg(int flag) 2748 { 2749 int oerrno; 2750 sigset_t sset; 2751 2752 if (!transflag) { 2753 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2754 return; 2755 } 2756 oerrno = errno; 2757 sigemptyset(&sset); 2758 sigaddset(&sset, SIGURG); 2759 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2760 errno = oerrno; 2761 } 2762 2763 static void 2764 flagxfer(int flag) 2765 { 2766 2767 if (flag) { 2768 if (transflag) 2769 syslog(LOG_ERR, "Internal: flagxfer(1): " 2770 "transfer already under way"); 2771 transflag = 1; 2772 maskurg(0); 2773 recvurg = 0; 2774 } else { 2775 if (!transflag) 2776 syslog(LOG_ERR, "Internal: flagxfer(0): " 2777 "no active transfer"); 2778 maskurg(1); 2779 transflag = 0; 2780 } 2781 } 2782 2783 /* 2784 * Returns 0 if OK to resume or -1 if abort requested. 2785 */ 2786 static int 2787 myoob(void) 2788 { 2789 char *cp; 2790 2791 if (!transflag) { 2792 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2793 return (0); 2794 } 2795 cp = tmpline; 2796 if (getline(cp, 7, stdin) == NULL) { 2797 reply(221, "You could at least say goodbye."); 2798 dologout(0); 2799 } 2800 upper(cp); 2801 if (strcmp(cp, "ABOR\r\n") == 0) { 2802 tmpline[0] = '\0'; 2803 reply(426, "Transfer aborted. Data connection closed."); 2804 reply(226, "Abort successful."); 2805 return (-1); 2806 } 2807 if (strcmp(cp, "STAT\r\n") == 0) { 2808 tmpline[0] = '\0'; 2809 if (file_size != -1) 2810 reply(213, "Status: %jd of %jd bytes transferred.", 2811 (intmax_t)byte_count, (intmax_t)file_size); 2812 else 2813 reply(213, "Status: %jd bytes transferred.", 2814 (intmax_t)byte_count); 2815 } 2816 return (0); 2817 } 2818 2819 /* 2820 * Note: a response of 425 is not mentioned as a possible response to 2821 * the PASV command in RFC959. However, it has been blessed as 2822 * a legitimate response by Jon Postel in a telephone conversation 2823 * with Rick Adams on 25 Jan 89. 2824 */ 2825 void 2826 passive(void) 2827 { 2828 socklen_t len; 2829 int on; 2830 char *p, *a; 2831 2832 if (pdata >= 0) /* close old port if one set */ 2833 close(pdata); 2834 2835 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2836 if (pdata < 0) { 2837 perror_reply(425, "Can't open passive connection"); 2838 return; 2839 } 2840 on = 1; 2841 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2842 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2843 2844 (void) seteuid(0); 2845 2846 #ifdef IP_PORTRANGE 2847 if (ctrl_addr.su_family == AF_INET) { 2848 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2849 : IP_PORTRANGE_DEFAULT; 2850 2851 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2852 &on, sizeof(on)) < 0) 2853 goto pasv_error; 2854 } 2855 #endif 2856 #ifdef IPV6_PORTRANGE 2857 if (ctrl_addr.su_family == AF_INET6) { 2858 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2859 : IPV6_PORTRANGE_DEFAULT; 2860 2861 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2862 &on, sizeof(on)) < 0) 2863 goto pasv_error; 2864 } 2865 #endif 2866 2867 pasv_addr = ctrl_addr; 2868 pasv_addr.su_port = 0; 2869 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2870 goto pasv_error; 2871 2872 (void) seteuid(pw->pw_uid); 2873 2874 len = sizeof(pasv_addr); 2875 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2876 goto pasv_error; 2877 if (listen(pdata, 1) < 0) 2878 goto pasv_error; 2879 if (pasv_addr.su_family == AF_INET) 2880 a = (char *) &pasv_addr.su_sin.sin_addr; 2881 else if (pasv_addr.su_family == AF_INET6 && 2882 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2883 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2884 else 2885 goto pasv_error; 2886 2887 p = (char *) &pasv_addr.su_port; 2888 2889 #define UC(b) (((int) b) & 0xff) 2890 2891 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2892 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2893 return; 2894 2895 pasv_error: 2896 (void) seteuid(pw->pw_uid); 2897 (void) close(pdata); 2898 pdata = -1; 2899 perror_reply(425, "Can't open passive connection"); 2900 return; 2901 } 2902 2903 /* 2904 * Long Passive defined in RFC 1639. 2905 * 228 Entering Long Passive Mode 2906 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2907 */ 2908 2909 void 2910 long_passive(char *cmd, int pf) 2911 { 2912 socklen_t len; 2913 int on; 2914 char *p, *a; 2915 2916 if (pdata >= 0) /* close old port if one set */ 2917 close(pdata); 2918 2919 if (pf != PF_UNSPEC) { 2920 if (ctrl_addr.su_family != pf) { 2921 switch (ctrl_addr.su_family) { 2922 case AF_INET: 2923 pf = 1; 2924 break; 2925 case AF_INET6: 2926 pf = 2; 2927 break; 2928 default: 2929 pf = 0; 2930 break; 2931 } 2932 /* 2933 * XXX 2934 * only EPRT/EPSV ready clients will understand this 2935 */ 2936 if (strcmp(cmd, "EPSV") == 0 && pf) { 2937 reply(522, "Network protocol mismatch, " 2938 "use (%d)", pf); 2939 } else 2940 reply(501, "Network protocol mismatch."); /*XXX*/ 2941 2942 return; 2943 } 2944 } 2945 2946 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2947 if (pdata < 0) { 2948 perror_reply(425, "Can't open passive connection"); 2949 return; 2950 } 2951 on = 1; 2952 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2953 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2954 2955 (void) seteuid(0); 2956 2957 pasv_addr = ctrl_addr; 2958 pasv_addr.su_port = 0; 2959 len = pasv_addr.su_len; 2960 2961 #ifdef IP_PORTRANGE 2962 if (ctrl_addr.su_family == AF_INET) { 2963 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2964 : IP_PORTRANGE_DEFAULT; 2965 2966 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2967 &on, sizeof(on)) < 0) 2968 goto pasv_error; 2969 } 2970 #endif 2971 #ifdef IPV6_PORTRANGE 2972 if (ctrl_addr.su_family == AF_INET6) { 2973 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2974 : IPV6_PORTRANGE_DEFAULT; 2975 2976 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2977 &on, sizeof(on)) < 0) 2978 goto pasv_error; 2979 } 2980 #endif 2981 2982 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2983 goto pasv_error; 2984 2985 (void) seteuid(pw->pw_uid); 2986 2987 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2988 goto pasv_error; 2989 if (listen(pdata, 1) < 0) 2990 goto pasv_error; 2991 2992 #define UC(b) (((int) b) & 0xff) 2993 2994 if (strcmp(cmd, "LPSV") == 0) { 2995 p = (char *)&pasv_addr.su_port; 2996 switch (pasv_addr.su_family) { 2997 case AF_INET: 2998 a = (char *) &pasv_addr.su_sin.sin_addr; 2999 v4_reply: 3000 reply(228, 3001 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3002 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3003 2, UC(p[0]), UC(p[1])); 3004 return; 3005 case AF_INET6: 3006 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3007 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3008 goto v4_reply; 3009 } 3010 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3011 reply(228, 3012 "Entering Long Passive Mode " 3013 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3014 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3015 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3016 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3017 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3018 2, UC(p[0]), UC(p[1])); 3019 return; 3020 } 3021 } else if (strcmp(cmd, "EPSV") == 0) { 3022 switch (pasv_addr.su_family) { 3023 case AF_INET: 3024 case AF_INET6: 3025 reply(229, "Entering Extended Passive Mode (|||%d|)", 3026 ntohs(pasv_addr.su_port)); 3027 return; 3028 } 3029 } else { 3030 /* more proper error code? */ 3031 } 3032 3033 pasv_error: 3034 (void) seteuid(pw->pw_uid); 3035 (void) close(pdata); 3036 pdata = -1; 3037 perror_reply(425, "Can't open passive connection"); 3038 return; 3039 } 3040 3041 /* 3042 * Generate unique name for file with basename "local" 3043 * and open the file in order to avoid possible races. 3044 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3045 * Return descriptor to the file, set "name" to its name. 3046 * 3047 * Generates failure reply on error. 3048 */ 3049 static int 3050 guniquefd(char *local, char **name) 3051 { 3052 static char new[MAXPATHLEN]; 3053 struct stat st; 3054 char *cp; 3055 int count; 3056 int fd; 3057 3058 cp = strrchr(local, '/'); 3059 if (cp) 3060 *cp = '\0'; 3061 if (stat(cp ? local : ".", &st) < 0) { 3062 perror_reply(553, cp ? local : "."); 3063 return (-1); 3064 } 3065 if (cp) { 3066 /* 3067 * Let not overwrite dirname with counter suffix. 3068 * -4 is for /nn\0 3069 * In this extreme case dot won't be put in front of suffix. 3070 */ 3071 if (strlen(local) > sizeof(new) - 4) { 3072 reply(553, "Pathname too long."); 3073 return (-1); 3074 } 3075 *cp = '/'; 3076 } 3077 /* -4 is for the .nn<null> we put on the end below */ 3078 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3079 cp = new + strlen(new); 3080 /* 3081 * Don't generate dotfile unless requested explicitly. 3082 * This covers the case when basename gets truncated off 3083 * by buffer size. 3084 */ 3085 if (cp > new && cp[-1] != '/') 3086 *cp++ = '.'; 3087 for (count = 0; count < 100; count++) { 3088 /* At count 0 try unmodified name */ 3089 if (count) 3090 (void)sprintf(cp, "%d", count); 3091 if ((fd = open(count ? new : local, 3092 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3093 *name = count ? new : local; 3094 return (fd); 3095 } 3096 if (errno != EEXIST) { 3097 perror_reply(553, count ? new : local); 3098 return (-1); 3099 } 3100 } 3101 reply(452, "Unique file name cannot be created."); 3102 return (-1); 3103 } 3104 3105 /* 3106 * Format and send reply containing system error number. 3107 */ 3108 void 3109 perror_reply(int code, char *string) 3110 { 3111 3112 reply(code, "%s: %s.", string, strerror(errno)); 3113 } 3114 3115 static char *onefile[] = { 3116 "", 3117 0 3118 }; 3119 3120 void 3121 send_file_list(char *whichf) 3122 { 3123 struct stat st; 3124 DIR *dirp = NULL; 3125 struct dirent *dir; 3126 FILE *dout = NULL; 3127 char **dirlist, *dirname; 3128 int simple = 0; 3129 int freeglob = 0; 3130 glob_t gl; 3131 3132 if (strpbrk(whichf, "~{[*?") != NULL) { 3133 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3134 3135 memset(&gl, 0, sizeof(gl)); 3136 gl.gl_matchc = MAXGLOBARGS; 3137 flags |= GLOB_LIMIT; 3138 freeglob = 1; 3139 if (glob(whichf, flags, 0, &gl)) { 3140 reply(550, "No matching files found."); 3141 goto out; 3142 } else if (gl.gl_pathc == 0) { 3143 errno = ENOENT; 3144 perror_reply(550, whichf); 3145 goto out; 3146 } 3147 dirlist = gl.gl_pathv; 3148 } else { 3149 onefile[0] = whichf; 3150 dirlist = onefile; 3151 simple = 1; 3152 } 3153 3154 while ((dirname = *dirlist++)) { 3155 if (stat(dirname, &st) < 0) { 3156 /* 3157 * If user typed "ls -l", etc, and the client 3158 * used NLST, do what the user meant. 3159 */ 3160 if (dirname[0] == '-' && *dirlist == NULL && 3161 dout == NULL) 3162 retrieve(_PATH_LS " %s", dirname); 3163 else 3164 perror_reply(550, whichf); 3165 goto out; 3166 } 3167 3168 if (S_ISREG(st.st_mode)) { 3169 if (dout == NULL) { 3170 dout = dataconn("file list", -1, "w"); 3171 if (dout == NULL) 3172 goto out; 3173 STARTXFER; 3174 } 3175 START_UNSAFE; 3176 fprintf(dout, "%s%s\n", dirname, 3177 type == TYPE_A ? "\r" : ""); 3178 END_UNSAFE; 3179 if (ferror(dout)) 3180 goto data_err; 3181 byte_count += strlen(dirname) + 3182 (type == TYPE_A ? 2 : 1); 3183 CHECKOOB(goto abrt); 3184 continue; 3185 } else if (!S_ISDIR(st.st_mode)) 3186 continue; 3187 3188 if ((dirp = opendir(dirname)) == NULL) 3189 continue; 3190 3191 while ((dir = readdir(dirp)) != NULL) { 3192 char nbuf[MAXPATHLEN]; 3193 3194 CHECKOOB(goto abrt); 3195 3196 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3197 continue; 3198 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3199 dir->d_namlen == 2) 3200 continue; 3201 3202 snprintf(nbuf, sizeof(nbuf), 3203 "%s/%s", dirname, dir->d_name); 3204 3205 /* 3206 * We have to do a stat to insure it's 3207 * not a directory or special file. 3208 */ 3209 if (simple || (stat(nbuf, &st) == 0 && 3210 S_ISREG(st.st_mode))) { 3211 if (dout == NULL) { 3212 dout = dataconn("file list", -1, "w"); 3213 if (dout == NULL) 3214 goto out; 3215 STARTXFER; 3216 } 3217 START_UNSAFE; 3218 if (nbuf[0] == '.' && nbuf[1] == '/') 3219 fprintf(dout, "%s%s\n", &nbuf[2], 3220 type == TYPE_A ? "\r" : ""); 3221 else 3222 fprintf(dout, "%s%s\n", nbuf, 3223 type == TYPE_A ? "\r" : ""); 3224 END_UNSAFE; 3225 if (ferror(dout)) 3226 goto data_err; 3227 byte_count += strlen(nbuf) + 3228 (type == TYPE_A ? 2 : 1); 3229 CHECKOOB(goto abrt); 3230 } 3231 } 3232 (void) closedir(dirp); 3233 dirp = NULL; 3234 } 3235 3236 if (dout == NULL) 3237 reply(550, "No files found."); 3238 else if (ferror(dout)) 3239 data_err: perror_reply(550, "Data connection"); 3240 else 3241 reply(226, "Transfer complete."); 3242 out: 3243 if (dout) { 3244 ENDXFER; 3245 abrt: 3246 (void) fclose(dout); 3247 data = -1; 3248 pdata = -1; 3249 } 3250 if (dirp) 3251 (void) closedir(dirp); 3252 if (freeglob) { 3253 freeglob = 0; 3254 globfree(&gl); 3255 } 3256 } 3257 3258 void 3259 reapchild(int signo) 3260 { 3261 while (waitpid(-1, NULL, WNOHANG) > 0); 3262 } 3263 3264 #ifdef OLD_SETPROCTITLE 3265 /* 3266 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3267 * Warning, since this is usually started from inetd.conf, it often doesn't 3268 * have much of an environment or arglist to overwrite. 3269 */ 3270 void 3271 setproctitle(const char *fmt, ...) 3272 { 3273 int i; 3274 va_list ap; 3275 char *p, *bp, ch; 3276 char buf[LINE_MAX]; 3277 3278 va_start(ap, fmt); 3279 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3280 3281 /* make ps print our process name */ 3282 p = Argv[0]; 3283 *p++ = '-'; 3284 3285 i = strlen(buf); 3286 if (i > LastArgv - p - 2) { 3287 i = LastArgv - p - 2; 3288 buf[i] = '\0'; 3289 } 3290 bp = buf; 3291 while (ch = *bp++) 3292 if (ch != '\n' && ch != '\r') 3293 *p++ = ch; 3294 while (p < LastArgv) 3295 *p++ = ' '; 3296 } 3297 #endif /* OLD_SETPROCTITLE */ 3298 3299 static void 3300 appendf(char **strp, char *fmt, ...) 3301 { 3302 va_list ap; 3303 char *ostr, *p; 3304 3305 va_start(ap, fmt); 3306 vasprintf(&p, fmt, ap); 3307 va_end(ap); 3308 if (p == NULL) 3309 fatalerror("Ran out of memory."); 3310 if (*strp == NULL) 3311 *strp = p; 3312 else { 3313 ostr = *strp; 3314 asprintf(strp, "%s%s", ostr, p); 3315 if (*strp == NULL) 3316 fatalerror("Ran out of memory."); 3317 free(ostr); 3318 } 3319 } 3320 3321 static void 3322 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3323 { 3324 char *msg = NULL; 3325 char wd[MAXPATHLEN + 1]; 3326 3327 if (logging <= 1) 3328 return; 3329 3330 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3331 strcpy(wd, strerror(errno)); 3332 3333 appendf(&msg, "%s", cmd); 3334 if (file1) 3335 appendf(&msg, " %s", file1); 3336 if (file2) 3337 appendf(&msg, " %s", file2); 3338 if (cnt >= 0) 3339 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3340 appendf(&msg, " (wd: %s", wd); 3341 if (guest || dochroot) 3342 appendf(&msg, "; chrooted"); 3343 appendf(&msg, ")"); 3344 syslog(LOG_INFO, "%s", msg); 3345 free(msg); 3346 } 3347 3348 static void 3349 logxfer(char *name, off_t size, time_t start) 3350 { 3351 char buf[MAXPATHLEN + 1024]; 3352 char path[MAXPATHLEN + 1]; 3353 time_t now; 3354 3355 if (statfd >= 0) { 3356 time(&now); 3357 if (realpath(name, path) == NULL) { 3358 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3359 return; 3360 } 3361 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3362 ctime(&now)+4, ident, remotehost, 3363 path, (intmax_t)size, 3364 (long)(now - start + (now == start))); 3365 write(statfd, buf, strlen(buf)); 3366 } 3367 } 3368 3369 static char * 3370 doublequote(char *s) 3371 { 3372 int n; 3373 char *p, *s2; 3374 3375 for (p = s, n = 0; *p; p++) 3376 if (*p == '"') 3377 n++; 3378 3379 if ((s2 = malloc(p - s + n + 1)) == NULL) 3380 return (NULL); 3381 3382 for (p = s2; *s; s++, p++) { 3383 if ((*p = *s) == '"') 3384 *(++p) = '"'; 3385 } 3386 *p = '\0'; 3387 3388 return (s2); 3389 } 3390 3391 /* setup server socket for specified address family */ 3392 /* if af is PF_UNSPEC more than one socket may be returned */ 3393 /* the returned list is dynamically allocated, so caller needs to free it */ 3394 static int * 3395 socksetup(int af, char *bindname, const char *bindport) 3396 { 3397 struct addrinfo hints, *res, *r; 3398 int error, maxs, *s, *socks; 3399 const int on = 1; 3400 3401 memset(&hints, 0, sizeof(hints)); 3402 hints.ai_flags = AI_PASSIVE; 3403 hints.ai_family = af; 3404 hints.ai_socktype = SOCK_STREAM; 3405 error = getaddrinfo(bindname, bindport, &hints, &res); 3406 if (error) { 3407 syslog(LOG_ERR, "%s", gai_strerror(error)); 3408 if (error == EAI_SYSTEM) 3409 syslog(LOG_ERR, "%s", strerror(errno)); 3410 return NULL; 3411 } 3412 3413 /* Count max number of sockets we may open */ 3414 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3415 ; 3416 socks = malloc((maxs + 1) * sizeof(int)); 3417 if (!socks) { 3418 freeaddrinfo(res); 3419 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3420 return NULL; 3421 } 3422 3423 *socks = 0; /* num of sockets counter at start of array */ 3424 s = socks + 1; 3425 for (r = res; r; r = r->ai_next) { 3426 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3427 if (*s < 0) { 3428 syslog(LOG_DEBUG, "control socket: %m"); 3429 continue; 3430 } 3431 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3432 &on, sizeof(on)) < 0) 3433 syslog(LOG_WARNING, 3434 "control setsockopt (SO_REUSEADDR): %m"); 3435 if (r->ai_family == AF_INET6) { 3436 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3437 &on, sizeof(on)) < 0) 3438 syslog(LOG_WARNING, 3439 "control setsockopt (IPV6_V6ONLY): %m"); 3440 } 3441 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3442 syslog(LOG_DEBUG, "control bind: %m"); 3443 close(*s); 3444 continue; 3445 } 3446 (*socks)++; 3447 s++; 3448 } 3449 3450 if (res) 3451 freeaddrinfo(res); 3452 3453 if (*socks == 0) { 3454 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3455 free(socks); 3456 return NULL; 3457 } 3458 return(socks); 3459 } 3460