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 static volatile sig_atomic_t recvurg; 151 sig_atomic_t transflag; 152 off_t file_size; 153 off_t byte_count; 154 #if !defined(CMASK) || CMASK == 0 155 #undef CMASK 156 #define CMASK 027 157 #endif 158 int defumask = CMASK; /* default umask value */ 159 char tmpline[7]; 160 char *hostname; 161 int epsvall = 0; 162 163 #ifdef VIRTUAL_HOSTING 164 char *ftpuser; 165 166 static struct ftphost { 167 struct ftphost *next; 168 struct addrinfo *hostinfo; 169 char *hostname; 170 char *anonuser; 171 char *statfile; 172 char *welcome; 173 char *loginmsg; 174 } *thishost, *firsthost; 175 176 #endif 177 char remotehost[MAXHOSTNAMELEN]; 178 char *ident = NULL; 179 180 static char ttyline[20]; 181 char *tty = ttyline; /* for klogin */ 182 183 #ifdef USE_PAM 184 static int auth_pam(struct passwd**, const char*); 185 pam_handle_t *pamh = NULL; 186 #endif 187 188 static struct opie opiedata; 189 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 190 static int pwok; 191 192 char *pid_file = NULL; 193 194 /* 195 * Limit number of pathnames that glob can return. 196 * A limit of 0 indicates the number of pathnames is unlimited. 197 */ 198 #define MAXGLOBARGS 16384 199 # 200 201 /* 202 * Timeout intervals for retrying connections 203 * to hosts that don't accept PORT cmds. This 204 * is a kludge, but given the problems with TCP... 205 */ 206 #define SWAITMAX 90 /* wait at most 90 seconds */ 207 #define SWAITINT 5 /* interval between retries */ 208 209 int swaitmax = SWAITMAX; 210 int swaitint = SWAITINT; 211 212 #ifdef SETPROCTITLE 213 #ifdef OLD_SETPROCTITLE 214 char **Argv = NULL; /* pointer to argument vector */ 215 char *LastArgv = NULL; /* end of argv */ 216 #endif /* OLD_SETPROCTITLE */ 217 char proctitle[LINE_MAX]; /* initial part of title */ 218 #endif /* SETPROCTITLE */ 219 220 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 221 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 222 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 223 224 #ifdef VIRTUAL_HOSTING 225 static void inithosts(void); 226 static void selecthost(union sockunion *); 227 #endif 228 static void ack(char *); 229 static void sigurg(int); 230 static void myoob(void); 231 static int checkuser(char *, char *, int, char **); 232 static FILE *dataconn(char *, off_t, char *); 233 static void dolog(struct sockaddr *); 234 static void end_login(void); 235 static FILE *getdatasock(char *); 236 static int guniquefd(char *, char **); 237 static void lostconn(int); 238 static void sigquit(int); 239 static int receive_data(FILE *, FILE *); 240 static int send_data(FILE *, FILE *, size_t, off_t, int); 241 static struct passwd * 242 sgetpwnam(char *); 243 static char *sgetsave(char *); 244 static void reapchild(int); 245 static void appendf(char **, char *, ...) __printflike(2, 3); 246 static void logcmd(char *, char *, char *, off_t); 247 static void logxfer(char *, off_t, time_t); 248 static char *doublequote(char *); 249 static int *socksetup(int, char *, const char *); 250 251 int 252 main(int argc, char *argv[], char **envp) 253 { 254 int addrlen, ch, on = 1, tos; 255 char *cp, line[LINE_MAX]; 256 FILE *fd; 257 char *bindname = NULL; 258 const char *bindport = "ftp"; 259 int family = AF_UNSPEC; 260 struct sigaction sa; 261 262 tzset(); /* in case no timezone database in ~ftp */ 263 sigemptyset(&sa.sa_mask); 264 sa.sa_flags = SA_RESTART; 265 266 #ifdef OLD_SETPROCTITLE 267 /* 268 * Save start and extent of argv for setproctitle. 269 */ 270 Argv = argv; 271 while (*envp) 272 envp++; 273 LastArgv = envp[-1] + strlen(envp[-1]); 274 #endif /* OLD_SETPROCTITLE */ 275 276 277 while ((ch = getopt(argc, argv, 278 "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 279 switch (ch) { 280 case '4': 281 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 282 break; 283 284 case '6': 285 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 286 break; 287 288 case 'a': 289 bindname = optarg; 290 break; 291 292 case 'A': 293 anon_only = 1; 294 break; 295 296 case 'd': 297 ftpdebug++; 298 break; 299 300 case 'D': 301 daemon_mode++; 302 break; 303 304 case 'E': 305 noepsv = 1; 306 break; 307 308 case 'h': 309 hostinfo = 0; 310 break; 311 312 case 'l': 313 logging++; /* > 1 == extra logging */ 314 break; 315 316 case 'm': 317 noguestmod = 0; 318 break; 319 320 case 'M': 321 noguestmkd = 1; 322 break; 323 324 case 'o': 325 noretr = 1; 326 break; 327 328 case 'O': 329 noguestretr = 1; 330 break; 331 332 case 'p': 333 pid_file = optarg; 334 break; 335 336 case 'P': 337 bindport = optarg; 338 break; 339 340 case 'r': 341 readonly = 1; 342 break; 343 344 case 'R': 345 paranoid = 0; 346 break; 347 348 case 'S': 349 stats++; 350 break; 351 352 case 't': 353 timeout = atoi(optarg); 354 if (maxtimeout < timeout) 355 maxtimeout = timeout; 356 break; 357 358 case 'T': 359 maxtimeout = atoi(optarg); 360 if (timeout > maxtimeout) 361 timeout = maxtimeout; 362 break; 363 364 case 'u': 365 { 366 long val = 0; 367 368 val = strtol(optarg, &optarg, 8); 369 if (*optarg != '\0' || val < 0) 370 warnx("bad value for -u"); 371 else 372 defumask = val; 373 break; 374 } 375 case 'U': 376 restricted_data_ports = 0; 377 break; 378 379 case 'v': 380 ftpdebug++; 381 break; 382 383 case 'W': 384 dowtmp = 0; 385 break; 386 387 default: 388 warnx("unknown flag -%c ignored", optopt); 389 break; 390 } 391 } 392 393 #ifdef VIRTUAL_HOSTING 394 inithosts(); 395 #endif 396 (void) freopen(_PATH_DEVNULL, "w", stderr); 397 398 /* 399 * LOG_NDELAY sets up the logging connection immediately, 400 * necessary for anonymous ftp's that chroot and can't do it later. 401 */ 402 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 403 404 if (daemon_mode) { 405 int *ctl_sock, fd, maxfd = -1, nfds, i; 406 fd_set defreadfds, readfds; 407 pid_t pid; 408 409 /* 410 * Detach from parent. 411 */ 412 if (daemon(1, 1) < 0) { 413 syslog(LOG_ERR, "failed to become a daemon"); 414 exit(1); 415 } 416 sa.sa_handler = reapchild; 417 (void)sigaction(SIGCHLD, &sa, NULL); 418 419 /* 420 * Open a socket, bind it to the FTP port, and start 421 * listening. 422 */ 423 ctl_sock = socksetup(family, bindname, bindport); 424 if (ctl_sock == NULL) 425 exit(1); 426 427 FD_ZERO(&defreadfds); 428 for (i = 1; i <= *ctl_sock; i++) { 429 FD_SET(ctl_sock[i], &defreadfds); 430 if (listen(ctl_sock[i], 32) < 0) { 431 syslog(LOG_ERR, "control listen: %m"); 432 exit(1); 433 } 434 if (maxfd < ctl_sock[i]) 435 maxfd = ctl_sock[i]; 436 } 437 438 /* 439 * Atomically write process ID 440 */ 441 if (pid_file) 442 { 443 int fd; 444 char buf[20]; 445 446 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 447 | O_NONBLOCK | O_EXLOCK, 0644); 448 if (fd < 0) { 449 if (errno == EAGAIN) 450 errx(1, "%s: file locked", pid_file); 451 else 452 err(1, "%s", pid_file); 453 } 454 snprintf(buf, sizeof(buf), 455 "%lu\n", (unsigned long) getpid()); 456 if (write(fd, buf, strlen(buf)) < 0) 457 err(1, "%s: write", pid_file); 458 /* Leave the pid file open and locked */ 459 } 460 /* 461 * Loop forever accepting connection requests and forking off 462 * children to handle them. 463 */ 464 while (1) { 465 FD_COPY(&defreadfds, &readfds); 466 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 467 if (nfds <= 0) { 468 if (nfds < 0 && errno != EINTR) 469 syslog(LOG_WARNING, "select: %m"); 470 continue; 471 } 472 473 pid = -1; 474 for (i = 1; i <= *ctl_sock; i++) 475 if (FD_ISSET(ctl_sock[i], &readfds)) { 476 addrlen = sizeof(his_addr); 477 fd = accept(ctl_sock[i], 478 (struct sockaddr *)&his_addr, 479 &addrlen); 480 if (fd >= 0) { 481 if ((pid = fork()) == 0) { 482 /* child */ 483 (void) dup2(fd, 0); 484 (void) dup2(fd, 1); 485 close(ctl_sock[i]); 486 } else 487 close(fd); 488 } 489 } 490 if (pid == 0) 491 break; 492 } 493 } else { 494 addrlen = sizeof(his_addr); 495 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 496 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 497 exit(1); 498 } 499 } 500 501 sa.sa_handler = SIG_DFL; 502 (void)sigaction(SIGCHLD, &sa, NULL); 503 504 sa.sa_handler = sigurg; 505 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 506 (void)sigaction(SIGURG, &sa, NULL); 507 508 sigfillset(&sa.sa_mask); /* block all signals in handler */ 509 sa.sa_flags = SA_RESTART; 510 sa.sa_handler = sigquit; 511 (void)sigaction(SIGHUP, &sa, NULL); 512 (void)sigaction(SIGINT, &sa, NULL); 513 (void)sigaction(SIGQUIT, &sa, NULL); 514 (void)sigaction(SIGTERM, &sa, NULL); 515 516 sa.sa_handler = lostconn; 517 (void)sigaction(SIGPIPE, &sa, NULL); 518 519 addrlen = sizeof(ctrl_addr); 520 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 521 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 522 exit(1); 523 } 524 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 525 #ifdef VIRTUAL_HOSTING 526 /* select our identity from virtual host table */ 527 selecthost(&ctrl_addr); 528 #endif 529 #ifdef IP_TOS 530 if (ctrl_addr.su_family == AF_INET) 531 { 532 tos = IPTOS_LOWDELAY; 533 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 534 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 535 } 536 #endif 537 /* 538 * Disable Nagle on the control channel so that we don't have to wait 539 * for peer's ACK before issuing our next reply. 540 */ 541 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 542 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 543 544 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 545 546 /* set this here so klogin can use it... */ 547 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 548 549 /* Try to handle urgent data inline */ 550 #ifdef SO_OOBINLINE 551 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 552 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 553 #endif 554 555 #ifdef F_SETOWN 556 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 557 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 558 #endif 559 dolog((struct sockaddr *)&his_addr); 560 /* 561 * Set up default state 562 */ 563 data = -1; 564 type = TYPE_A; 565 form = FORM_N; 566 stru = STRU_F; 567 mode = MODE_S; 568 tmpline[0] = '\0'; 569 570 /* If logins are disabled, print out the message. */ 571 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 572 while (fgets(line, sizeof(line), fd) != NULL) { 573 if ((cp = strchr(line, '\n')) != NULL) 574 *cp = '\0'; 575 lreply(530, "%s", line); 576 } 577 (void) fflush(stdout); 578 (void) fclose(fd); 579 reply(530, "System not available."); 580 exit(0); 581 } 582 #ifdef VIRTUAL_HOSTING 583 fd = fopen(thishost->welcome, "r"); 584 #else 585 fd = fopen(_PATH_FTPWELCOME, "r"); 586 #endif 587 if (fd != NULL) { 588 while (fgets(line, sizeof(line), fd) != NULL) { 589 if ((cp = strchr(line, '\n')) != NULL) 590 *cp = '\0'; 591 lreply(220, "%s", line); 592 } 593 (void) fflush(stdout); 594 (void) fclose(fd); 595 /* reply(220,) must follow */ 596 } 597 #ifndef VIRTUAL_HOSTING 598 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 599 fatalerror("Ran out of memory."); 600 (void) gethostname(hostname, MAXHOSTNAMELEN - 1); 601 hostname[MAXHOSTNAMELEN - 1] = '\0'; 602 #endif 603 if (hostinfo) 604 reply(220, "%s FTP server (%s) ready.", hostname, version); 605 else 606 reply(220, "FTP server ready."); 607 for (;;) 608 (void) yyparse(); 609 /* NOTREACHED */ 610 } 611 612 static void 613 lostconn(int signo) 614 { 615 616 if (ftpdebug) 617 syslog(LOG_DEBUG, "lost connection"); 618 dologout(1); 619 } 620 621 static void 622 sigquit(int signo) 623 { 624 625 syslog(LOG_ERR, "got signal %d", signo); 626 dologout(1); 627 } 628 629 #ifdef VIRTUAL_HOSTING 630 /* 631 * read in virtual host tables (if they exist) 632 */ 633 634 static void 635 inithosts(void) 636 { 637 int insert; 638 size_t len; 639 FILE *fp; 640 char *cp, *mp, *line; 641 char *hostname; 642 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 643 struct ftphost *hrp, *lhrp; 644 struct addrinfo hints, *res, *ai; 645 646 /* 647 * Fill in the default host information 648 */ 649 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 650 fatalerror("Ran out of memory."); 651 if (gethostname(hostname, MAXHOSTNAMELEN) < 0) 652 hostname[0] = '\0'; 653 hostname[MAXHOSTNAMELEN - 1] = '\0'; 654 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 655 fatalerror("Ran out of memory."); 656 hrp->hostname = hostname; 657 hrp->hostinfo = NULL; 658 659 memset(&hints, 0, sizeof(hints)); 660 hints.ai_flags = AI_CANONNAME; 661 hints.ai_family = AF_UNSPEC; 662 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 663 hrp->hostinfo = res; 664 hrp->statfile = _PATH_FTPDSTATFILE; 665 hrp->welcome = _PATH_FTPWELCOME; 666 hrp->loginmsg = _PATH_FTPLOGINMESG; 667 hrp->anonuser = "ftp"; 668 hrp->next = NULL; 669 thishost = firsthost = lhrp = hrp; 670 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 671 int addrsize, gothost; 672 void *addr; 673 struct hostent *hp; 674 675 while ((line = fgetln(fp, &len)) != NULL) { 676 int i, hp_error; 677 678 /* skip comments */ 679 if (line[0] == '#') 680 continue; 681 if (line[len - 1] == '\n') { 682 line[len - 1] = '\0'; 683 mp = NULL; 684 } else { 685 if ((mp = malloc(len + 1)) == NULL) 686 fatalerror("Ran out of memory."); 687 memcpy(mp, line, len); 688 mp[len] = '\0'; 689 line = mp; 690 } 691 cp = strtok(line, " \t"); 692 /* skip empty lines */ 693 if (cp == NULL) 694 goto nextline; 695 vhost = cp; 696 697 /* set defaults */ 698 anonuser = "ftp"; 699 statfile = _PATH_FTPDSTATFILE; 700 welcome = _PATH_FTPWELCOME; 701 loginmsg = _PATH_FTPLOGINMESG; 702 703 /* 704 * Preparse the line so we can use its info 705 * for all the addresses associated with 706 * the virtual host name. 707 * Field 0, the virtual host name, is special: 708 * it's already parsed off and will be strdup'ed 709 * later, after we know its canonical form. 710 */ 711 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 712 if (*cp != '-' && (cp = strdup(cp))) 713 switch (i) { 714 case 1: /* anon user permissions */ 715 anonuser = cp; 716 break; 717 case 2: /* statistics file */ 718 statfile = cp; 719 break; 720 case 3: /* welcome message */ 721 welcome = cp; 722 break; 723 case 4: /* login message */ 724 loginmsg = cp; 725 break; 726 default: /* programming error */ 727 abort(); 728 /* NOTREACHED */ 729 } 730 731 hints.ai_flags = 0; 732 hints.ai_family = AF_UNSPEC; 733 hints.ai_flags = AI_PASSIVE; 734 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 735 goto nextline; 736 for (ai = res; ai != NULL && ai->ai_addr != NULL; 737 ai = ai->ai_next) { 738 739 gothost = 0; 740 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 741 struct addrinfo *hi; 742 743 for (hi = hrp->hostinfo; hi != NULL; 744 hi = hi->ai_next) 745 if (hi->ai_addrlen == ai->ai_addrlen && 746 memcmp(hi->ai_addr, 747 ai->ai_addr, 748 ai->ai_addr->sa_len) == 0) { 749 gothost++; 750 break; 751 } 752 if (gothost) 753 break; 754 } 755 if (hrp == NULL) { 756 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 757 goto nextline; 758 hrp->hostname = NULL; 759 insert = 1; 760 } else { 761 if (hrp->hostinfo && hrp->hostinfo != res) 762 freeaddrinfo(hrp->hostinfo); 763 insert = 0; /* host already in the chain */ 764 } 765 hrp->hostinfo = res; 766 767 /* 768 * determine hostname to use. 769 * force defined name if there is a valid alias 770 * otherwise fallback to primary hostname 771 */ 772 /* XXX: getaddrinfo() can't do alias check */ 773 switch(hrp->hostinfo->ai_family) { 774 case AF_INET: 775 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 776 addrsize = sizeof(struct in_addr); 777 break; 778 case AF_INET6: 779 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 780 addrsize = sizeof(struct in6_addr); 781 break; 782 default: 783 /* should not reach here */ 784 freeaddrinfo(hrp->hostinfo); 785 if (insert) 786 free(hrp); /*not in chain, can free*/ 787 else 788 hrp->hostinfo = NULL; /*mark as blank*/ 789 goto nextline; 790 /* NOTREACHED */ 791 } 792 if ((hp = getipnodebyaddr(addr, addrsize, 793 hrp->hostinfo->ai_family, 794 &hp_error)) != NULL) { 795 if (strcmp(vhost, hp->h_name) != 0) { 796 if (hp->h_aliases == NULL) 797 vhost = hp->h_name; 798 else { 799 i = 0; 800 while (hp->h_aliases[i] && 801 strcmp(vhost, hp->h_aliases[i]) != 0) 802 ++i; 803 if (hp->h_aliases[i] == NULL) 804 vhost = hp->h_name; 805 } 806 } 807 } 808 if (hrp->hostname && 809 strcmp(hrp->hostname, vhost) != 0) { 810 free(hrp->hostname); 811 hrp->hostname = NULL; 812 } 813 if (hrp->hostname == NULL && 814 (hrp->hostname = strdup(vhost)) == NULL) { 815 freeaddrinfo(hrp->hostinfo); 816 hrp->hostinfo = NULL; /* mark as blank */ 817 if (hp) 818 freehostent(hp); 819 goto nextline; 820 } 821 hrp->anonuser = anonuser; 822 hrp->statfile = statfile; 823 hrp->welcome = welcome; 824 hrp->loginmsg = loginmsg; 825 if (insert) { 826 hrp->next = NULL; 827 lhrp->next = hrp; 828 lhrp = hrp; 829 } 830 if (hp) 831 freehostent(hp); 832 } 833 nextline: 834 if (mp) 835 free(mp); 836 } 837 (void) fclose(fp); 838 } 839 } 840 841 static void 842 selecthost(union sockunion *su) 843 { 844 struct ftphost *hrp; 845 u_int16_t port; 846 #ifdef INET6 847 struct in6_addr *mapped_in6 = NULL; 848 #endif 849 struct addrinfo *hi; 850 851 #ifdef INET6 852 /* 853 * XXX IPv4 mapped IPv6 addr consideraton, 854 * specified in rfc2373. 855 */ 856 if (su->su_family == AF_INET6 && 857 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 858 mapped_in6 = &su->su_sin6.sin6_addr; 859 #endif 860 861 hrp = thishost = firsthost; /* default */ 862 port = su->su_port; 863 su->su_port = 0; 864 while (hrp != NULL) { 865 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 866 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 867 thishost = hrp; 868 break; 869 } 870 #ifdef INET6 871 /* XXX IPv4 mapped IPv6 addr consideraton */ 872 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 873 (memcmp(&mapped_in6->s6_addr[12], 874 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 875 sizeof(struct in_addr)) == 0)) { 876 thishost = hrp; 877 break; 878 } 879 #endif 880 } 881 hrp = hrp->next; 882 } 883 su->su_port = port; 884 /* setup static variables as appropriate */ 885 hostname = thishost->hostname; 886 ftpuser = thishost->anonuser; 887 } 888 #endif 889 890 /* 891 * Helper function for sgetpwnam(). 892 */ 893 static char * 894 sgetsave(char *s) 895 { 896 char *new = malloc(strlen(s) + 1); 897 898 if (new == NULL) { 899 reply(421, "Ran out of memory."); 900 dologout(1); 901 /* NOTREACHED */ 902 } 903 (void) strcpy(new, s); 904 return (new); 905 } 906 907 /* 908 * Save the result of a getpwnam. Used for USER command, since 909 * the data returned must not be clobbered by any other command 910 * (e.g., globbing). 911 * NB: The data returned by sgetpwnam() will remain valid until 912 * the next call to this function. Its difference from getpwnam() 913 * is that sgetpwnam() is known to be called from ftpd code only. 914 */ 915 static struct passwd * 916 sgetpwnam(char *name) 917 { 918 static struct passwd save; 919 struct passwd *p; 920 921 if ((p = getpwnam(name)) == NULL) 922 return (p); 923 if (save.pw_name) { 924 free(save.pw_name); 925 free(save.pw_passwd); 926 free(save.pw_gecos); 927 free(save.pw_dir); 928 free(save.pw_shell); 929 } 930 save = *p; 931 save.pw_name = sgetsave(p->pw_name); 932 save.pw_passwd = sgetsave(p->pw_passwd); 933 save.pw_gecos = sgetsave(p->pw_gecos); 934 save.pw_dir = sgetsave(p->pw_dir); 935 save.pw_shell = sgetsave(p->pw_shell); 936 return (&save); 937 } 938 939 static int login_attempts; /* number of failed login attempts */ 940 static int askpasswd; /* had user command, ask for passwd */ 941 static char curname[MAXLOGNAME]; /* current USER name */ 942 943 /* 944 * USER command. 945 * Sets global passwd pointer pw if named account exists and is acceptable; 946 * sets askpasswd if a PASS command is expected. If logged in previously, 947 * need to reset state. If name is "ftp" or "anonymous", the name is not in 948 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 949 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 950 * requesting login privileges. Disallow anyone who does not have a standard 951 * shell as returned by getusershell(). Disallow anyone mentioned in the file 952 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 953 */ 954 void 955 user(char *name) 956 { 957 char *cp, *shell; 958 959 if (logged_in) { 960 if (guest) { 961 reply(530, "Can't change user from guest login."); 962 return; 963 } else if (dochroot) { 964 reply(530, "Can't change user from chroot user."); 965 return; 966 } 967 end_login(); 968 } 969 970 guest = 0; 971 #ifdef VIRTUAL_HOSTING 972 pw = sgetpwnam(thishost->anonuser); 973 #else 974 pw = sgetpwnam("ftp"); 975 #endif 976 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 977 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 978 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 979 reply(530, "User %s access denied.", name); 980 else if (pw != NULL) { 981 guest = 1; 982 askpasswd = 1; 983 reply(331, 984 "Guest login ok, send your email address as password."); 985 } else 986 reply(530, "User %s unknown.", name); 987 if (!askpasswd && logging) 988 syslog(LOG_NOTICE, 989 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 990 return; 991 } 992 if (anon_only != 0) { 993 reply(530, "Sorry, only anonymous ftp allowed."); 994 return; 995 } 996 997 if ((pw = sgetpwnam(name))) { 998 if ((shell = pw->pw_shell) == NULL || *shell == 0) 999 shell = _PATH_BSHELL; 1000 setusershell(); 1001 while ((cp = getusershell()) != NULL) 1002 if (strcmp(cp, shell) == 0) 1003 break; 1004 endusershell(); 1005 1006 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1007 reply(530, "User %s access denied.", name); 1008 if (logging) 1009 syslog(LOG_NOTICE, 1010 "FTP LOGIN REFUSED FROM %s, %s", 1011 remotehost, name); 1012 pw = NULL; 1013 return; 1014 } 1015 } 1016 if (logging) 1017 strncpy(curname, name, sizeof(curname)-1); 1018 1019 pwok = 0; 1020 #ifdef USE_PAM 1021 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1022 #endif 1023 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1024 pwok = (pw != NULL) && 1025 opieaccessfile(remotehost) && 1026 opiealways(pw->pw_dir); 1027 reply(331, "Response to %s %s for %s.", 1028 opieprompt, pwok ? "requested" : "required", name); 1029 } else { 1030 pwok = 1; 1031 reply(331, "Password required for %s.", name); 1032 } 1033 askpasswd = 1; 1034 /* 1035 * Delay before reading passwd after first failed 1036 * attempt to slow down passwd-guessing programs. 1037 */ 1038 if (login_attempts) 1039 sleep(login_attempts); 1040 } 1041 1042 /* 1043 * Check if a user is in the file "fname", 1044 * return a pointer to a malloc'd string with the rest 1045 * of the matching line in "residue" if not NULL. 1046 */ 1047 static int 1048 checkuser(char *fname, char *name, int pwset, char **residue) 1049 { 1050 FILE *fd; 1051 int found = 0; 1052 size_t len; 1053 char *line, *mp, *p; 1054 1055 if ((fd = fopen(fname, "r")) != NULL) { 1056 while (!found && (line = fgetln(fd, &len)) != NULL) { 1057 /* skip comments */ 1058 if (line[0] == '#') 1059 continue; 1060 if (line[len - 1] == '\n') { 1061 line[len - 1] = '\0'; 1062 mp = NULL; 1063 } else { 1064 if ((mp = malloc(len + 1)) == NULL) 1065 fatalerror("Ran out of memory."); 1066 memcpy(mp, line, len); 1067 mp[len] = '\0'; 1068 line = mp; 1069 } 1070 /* avoid possible leading and trailing whitespace */ 1071 p = strtok(line, " \t"); 1072 /* skip empty lines */ 1073 if (p == NULL) 1074 goto nextline; 1075 /* 1076 * if first chr is '@', check group membership 1077 */ 1078 if (p[0] == '@') { 1079 int i = 0; 1080 struct group *grp; 1081 1082 if (p[1] == '\0') /* single @ matches anyone */ 1083 found = 1; 1084 else { 1085 if ((grp = getgrnam(p+1)) == NULL) 1086 goto nextline; 1087 /* 1088 * Check user's default group 1089 */ 1090 if (pwset && grp->gr_gid == pw->pw_gid) 1091 found = 1; 1092 /* 1093 * Check supplementary groups 1094 */ 1095 while (!found && grp->gr_mem[i]) 1096 found = strcmp(name, 1097 grp->gr_mem[i++]) 1098 == 0; 1099 } 1100 } 1101 /* 1102 * Otherwise, just check for username match 1103 */ 1104 else 1105 found = strcmp(p, name) == 0; 1106 /* 1107 * Save the rest of line to "residue" if matched 1108 */ 1109 if (found && residue) { 1110 if ((p = strtok(NULL, "")) != NULL) 1111 p += strspn(p, " \t"); 1112 if (p && *p) { 1113 if ((*residue = strdup(p)) == NULL) 1114 fatalerror("Ran out of memory."); 1115 } else 1116 *residue = NULL; 1117 } 1118 nextline: 1119 if (mp) 1120 free(mp); 1121 } 1122 (void) fclose(fd); 1123 } 1124 return (found); 1125 } 1126 1127 /* 1128 * Terminate login as previous user, if any, resetting state; 1129 * used when USER command is given or login fails. 1130 */ 1131 static void 1132 end_login(void) 1133 { 1134 #ifdef USE_PAM 1135 int e; 1136 #endif 1137 1138 (void) seteuid(0); 1139 if (logged_in && dowtmp) 1140 ftpd_logwtmp(ttyline, "", NULL); 1141 pw = NULL; 1142 #ifdef LOGIN_CAP 1143 setusercontext(NULL, getpwuid(0), 0, 1144 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1145 LOGIN_SETMAC); 1146 #endif 1147 #ifdef USE_PAM 1148 if (pamh) { 1149 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1150 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1151 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1152 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1153 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1154 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1155 pamh = NULL; 1156 } 1157 #endif 1158 logged_in = 0; 1159 guest = 0; 1160 dochroot = 0; 1161 } 1162 1163 #ifdef USE_PAM 1164 1165 /* 1166 * the following code is stolen from imap-uw PAM authentication module and 1167 * login.c 1168 */ 1169 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1170 1171 struct cred_t { 1172 const char *uname; /* user name */ 1173 const char *pass; /* password */ 1174 }; 1175 typedef struct cred_t cred_t; 1176 1177 static int 1178 auth_conv(int num_msg, const struct pam_message **msg, 1179 struct pam_response **resp, void *appdata) 1180 { 1181 int i; 1182 cred_t *cred = (cred_t *) appdata; 1183 struct pam_response *reply; 1184 1185 reply = calloc(num_msg, sizeof *reply); 1186 if (reply == NULL) 1187 return PAM_BUF_ERR; 1188 1189 for (i = 0; i < num_msg; i++) { 1190 switch (msg[i]->msg_style) { 1191 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1192 reply[i].resp_retcode = PAM_SUCCESS; 1193 reply[i].resp = COPY_STRING(cred->uname); 1194 /* PAM frees resp. */ 1195 break; 1196 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1197 reply[i].resp_retcode = PAM_SUCCESS; 1198 reply[i].resp = COPY_STRING(cred->pass); 1199 /* PAM frees resp. */ 1200 break; 1201 case PAM_TEXT_INFO: 1202 case PAM_ERROR_MSG: 1203 reply[i].resp_retcode = PAM_SUCCESS; 1204 reply[i].resp = NULL; 1205 break; 1206 default: /* unknown message style */ 1207 free(reply); 1208 return PAM_CONV_ERR; 1209 } 1210 } 1211 1212 *resp = reply; 1213 return PAM_SUCCESS; 1214 } 1215 1216 /* 1217 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1218 * authenticated, or 1 if not authenticated. If some sort of PAM system 1219 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1220 * function returns -1. This can be used as an indication that we should 1221 * fall back to a different authentication mechanism. 1222 */ 1223 static int 1224 auth_pam(struct passwd **ppw, const char *pass) 1225 { 1226 const char *tmpl_user; 1227 const void *item; 1228 int rval; 1229 int e; 1230 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1231 struct pam_conv conv = { &auth_conv, &auth_cred }; 1232 1233 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1234 if (e != PAM_SUCCESS) { 1235 /* 1236 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1237 * if context creation has failed in the first place. 1238 */ 1239 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1240 return -1; 1241 } 1242 1243 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1244 if (e != PAM_SUCCESS) { 1245 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1246 pam_strerror(pamh, e)); 1247 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1248 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1249 } 1250 pamh = NULL; 1251 return -1; 1252 } 1253 1254 e = pam_authenticate(pamh, 0); 1255 switch (e) { 1256 case PAM_SUCCESS: 1257 /* 1258 * With PAM we support the concept of a "template" 1259 * user. The user enters a login name which is 1260 * authenticated by PAM, usually via a remote service 1261 * such as RADIUS or TACACS+. If authentication 1262 * succeeds, a different but related "template" name 1263 * is used for setting the credentials, shell, and 1264 * home directory. The name the user enters need only 1265 * exist on the remote authentication server, but the 1266 * template name must be present in the local password 1267 * database. 1268 * 1269 * This is supported by two various mechanisms in the 1270 * individual modules. However, from the application's 1271 * point of view, the template user is always passed 1272 * back as a changed value of the PAM_USER item. 1273 */ 1274 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1275 PAM_SUCCESS) { 1276 tmpl_user = (const char *) item; 1277 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1278 *ppw = getpwnam(tmpl_user); 1279 } else 1280 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1281 pam_strerror(pamh, e)); 1282 rval = 0; 1283 break; 1284 1285 case PAM_AUTH_ERR: 1286 case PAM_USER_UNKNOWN: 1287 case PAM_MAXTRIES: 1288 rval = 1; 1289 break; 1290 1291 default: 1292 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1293 rval = -1; 1294 break; 1295 } 1296 1297 if (rval == 0) { 1298 e = pam_acct_mgmt(pamh, 0); 1299 if (e == PAM_NEW_AUTHTOK_REQD) { 1300 e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); 1301 if (e != PAM_SUCCESS) { 1302 syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); 1303 rval = 1; 1304 } 1305 } else if (e != PAM_SUCCESS) { 1306 rval = 1; 1307 } 1308 } 1309 1310 if (rval != 0) { 1311 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1312 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1313 } 1314 pamh = NULL; 1315 } 1316 return rval; 1317 } 1318 1319 #endif /* USE_PAM */ 1320 1321 void 1322 pass(char *passwd) 1323 { 1324 int rval; 1325 FILE *fd; 1326 #ifdef LOGIN_CAP 1327 login_cap_t *lc = NULL; 1328 #endif 1329 #ifdef USE_PAM 1330 int e; 1331 #endif 1332 char *residue = NULL; 1333 char *xpasswd; 1334 1335 if (logged_in || askpasswd == 0) { 1336 reply(503, "Login with USER first."); 1337 return; 1338 } 1339 askpasswd = 0; 1340 if (!guest) { /* "ftp" is only account allowed no password */ 1341 if (pw == NULL) { 1342 rval = 1; /* failure below */ 1343 goto skip; 1344 } 1345 #ifdef USE_PAM 1346 rval = auth_pam(&pw, passwd); 1347 if (rval >= 0) { 1348 opieunlock(); 1349 goto skip; 1350 } 1351 #endif 1352 if (opieverify(&opiedata, passwd) == 0) 1353 xpasswd = pw->pw_passwd; 1354 else if (pwok) { 1355 xpasswd = crypt(passwd, pw->pw_passwd); 1356 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1357 xpasswd = ":"; 1358 } else { 1359 rval = 1; 1360 goto skip; 1361 } 1362 rval = strcmp(pw->pw_passwd, xpasswd); 1363 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1364 rval = 1; /* failure */ 1365 skip: 1366 /* 1367 * If rval == 1, the user failed the authentication check 1368 * above. If rval == 0, either PAM or local authentication 1369 * succeeded. 1370 */ 1371 if (rval) { 1372 reply(530, "Login incorrect."); 1373 if (logging) { 1374 syslog(LOG_NOTICE, 1375 "FTP LOGIN FAILED FROM %s", 1376 remotehost); 1377 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1378 "FTP LOGIN FAILED FROM %s, %s", 1379 remotehost, curname); 1380 } 1381 pw = NULL; 1382 if (login_attempts++ >= 5) { 1383 syslog(LOG_NOTICE, 1384 "repeated login failures from %s", 1385 remotehost); 1386 exit(0); 1387 } 1388 return; 1389 } 1390 } 1391 login_attempts = 0; /* this time successful */ 1392 if (setegid(pw->pw_gid) < 0) { 1393 reply(550, "Can't set gid."); 1394 return; 1395 } 1396 /* May be overridden by login.conf */ 1397 (void) umask(defumask); 1398 #ifdef LOGIN_CAP 1399 if ((lc = login_getpwclass(pw)) != NULL) { 1400 char remote_ip[MAXHOSTNAMELEN]; 1401 1402 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1403 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1404 NI_NUMERICHOST); 1405 remote_ip[sizeof(remote_ip) - 1] = 0; 1406 if (!auth_hostok(lc, remotehost, remote_ip)) { 1407 syslog(LOG_INFO|LOG_AUTH, 1408 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1409 pw->pw_name); 1410 reply(530, "Permission denied."); 1411 pw = NULL; 1412 return; 1413 } 1414 if (!auth_timeok(lc, time(NULL))) { 1415 reply(530, "Login not available right now."); 1416 pw = NULL; 1417 return; 1418 } 1419 } 1420 setusercontext(lc, pw, 0, 1421 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1422 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1423 #else 1424 setlogin(pw->pw_name); 1425 (void) initgroups(pw->pw_name, pw->pw_gid); 1426 #endif 1427 1428 #ifdef USE_PAM 1429 if (pamh) { 1430 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1431 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1432 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1433 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1434 } 1435 } 1436 #endif 1437 1438 /* open wtmp before chroot */ 1439 if (dowtmp) 1440 ftpd_logwtmp(ttyline, pw->pw_name, 1441 (struct sockaddr *)&his_addr); 1442 logged_in = 1; 1443 1444 if (guest && stats && statfd < 0) 1445 #ifdef VIRTUAL_HOSTING 1446 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1447 #else 1448 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1449 #endif 1450 if (statfd < 0) 1451 stats = 0; 1452 1453 dochroot = 1454 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1455 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1456 || login_getcapbool(lc, "ftp-chroot", 0) 1457 #endif 1458 ; 1459 chrootdir = NULL; 1460 /* 1461 * For a chrooted local user, 1462 * a) see whether ftpchroot(5) specifies a chroot directory, 1463 * b) extract the directory pathname from the line, 1464 * c) expand it to the absolute pathname if necessary. 1465 */ 1466 if (dochroot && residue && 1467 (chrootdir = strtok(residue, " \t")) != NULL) { 1468 if (chrootdir[0] != '/') 1469 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1470 else 1471 chrootdir = strdup(chrootdir); /* make it permanent */ 1472 if (chrootdir == NULL) 1473 fatalerror("Ran out of memory."); 1474 } 1475 if (guest || dochroot) { 1476 /* 1477 * If no chroot directory set yet, use the login directory. 1478 * Copy it so it can be modified while pw->pw_dir stays intact. 1479 */ 1480 if (chrootdir == NULL && 1481 (chrootdir = strdup(pw->pw_dir)) == NULL) 1482 fatalerror("Ran out of memory."); 1483 /* 1484 * Check for the "/chroot/./home" syntax, 1485 * separate the chroot and home directory pathnames. 1486 */ 1487 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1488 *(homedir++) = '\0'; /* wipe '/' */ 1489 homedir++; /* skip '.' */ 1490 } else { 1491 /* 1492 * We MUST do a chdir() after the chroot. Otherwise 1493 * the old current directory will be accessible as "." 1494 * outside the new root! 1495 */ 1496 homedir = "/"; 1497 } 1498 /* 1499 * Finally, do chroot() 1500 */ 1501 if (chroot(chrootdir) < 0) { 1502 reply(550, "Can't change root."); 1503 goto bad; 1504 } 1505 } else /* real user w/o chroot */ 1506 homedir = pw->pw_dir; 1507 /* 1508 * Set euid *before* doing chdir() so 1509 * a) the user won't be carried to a directory that he couldn't reach 1510 * on his own due to no permission to upper path components, 1511 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1512 * (uid 0 has no root power over NFS if not mapped explicitly.) 1513 */ 1514 if (seteuid(pw->pw_uid) < 0) { 1515 reply(550, "Can't set uid."); 1516 goto bad; 1517 } 1518 if (chdir(homedir) < 0) { 1519 if (guest || dochroot) { 1520 reply(550, "Can't change to base directory."); 1521 goto bad; 1522 } else { 1523 if (chdir("/") < 0) { 1524 reply(550, "Root is inaccessible."); 1525 goto bad; 1526 } 1527 lreply(230, "No directory! Logging in with home=/."); 1528 } 1529 } 1530 1531 /* 1532 * Display a login message, if it exists. 1533 * N.B. reply(230,) must follow the message. 1534 */ 1535 #ifdef VIRTUAL_HOSTING 1536 fd = fopen(thishost->loginmsg, "r"); 1537 #else 1538 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1539 #endif 1540 if (fd != NULL) { 1541 char *cp, line[LINE_MAX]; 1542 1543 while (fgets(line, sizeof(line), fd) != NULL) { 1544 if ((cp = strchr(line, '\n')) != NULL) 1545 *cp = '\0'; 1546 lreply(230, "%s", line); 1547 } 1548 (void) fflush(stdout); 1549 (void) fclose(fd); 1550 } 1551 if (guest) { 1552 if (ident != NULL) 1553 free(ident); 1554 ident = strdup(passwd); 1555 if (ident == NULL) 1556 fatalerror("Ran out of memory."); 1557 1558 reply(230, "Guest login ok, access restrictions apply."); 1559 #ifdef SETPROCTITLE 1560 #ifdef VIRTUAL_HOSTING 1561 if (thishost != firsthost) 1562 snprintf(proctitle, sizeof(proctitle), 1563 "%s: anonymous(%s)/%s", remotehost, hostname, 1564 passwd); 1565 else 1566 #endif 1567 snprintf(proctitle, sizeof(proctitle), 1568 "%s: anonymous/%s", remotehost, passwd); 1569 setproctitle("%s", proctitle); 1570 #endif /* SETPROCTITLE */ 1571 if (logging) 1572 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1573 remotehost, passwd); 1574 } else { 1575 if (dochroot) 1576 reply(230, "User %s logged in, " 1577 "access restrictions apply.", pw->pw_name); 1578 else 1579 reply(230, "User %s logged in.", pw->pw_name); 1580 1581 #ifdef SETPROCTITLE 1582 snprintf(proctitle, sizeof(proctitle), 1583 "%s: user/%s", remotehost, pw->pw_name); 1584 setproctitle("%s", proctitle); 1585 #endif /* SETPROCTITLE */ 1586 if (logging) 1587 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1588 remotehost, pw->pw_name); 1589 } 1590 #ifdef LOGIN_CAP 1591 login_close(lc); 1592 #endif 1593 if (residue) 1594 free(residue); 1595 return; 1596 bad: 1597 /* Forget all about it... */ 1598 #ifdef LOGIN_CAP 1599 login_close(lc); 1600 #endif 1601 if (residue) 1602 free(residue); 1603 end_login(); 1604 } 1605 1606 void 1607 retrieve(char *cmd, char *name) 1608 { 1609 FILE *fin, *dout; 1610 struct stat st; 1611 int (*closefunc)(FILE *); 1612 time_t start; 1613 1614 if (cmd == 0) { 1615 fin = fopen(name, "r"), closefunc = fclose; 1616 st.st_size = 0; 1617 } else { 1618 char line[BUFSIZ]; 1619 1620 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1621 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1622 st.st_size = -1; 1623 st.st_blksize = BUFSIZ; 1624 } 1625 if (fin == NULL) { 1626 if (errno != 0) { 1627 perror_reply(550, name); 1628 if (cmd == 0) { 1629 LOGCMD("get", name); 1630 } 1631 } 1632 return; 1633 } 1634 byte_count = -1; 1635 if (cmd == 0) { 1636 if (fstat(fileno(fin), &st) < 0) { 1637 perror_reply(550, name); 1638 goto done; 1639 } 1640 if (!S_ISREG(st.st_mode)) { 1641 /* 1642 * Never sending a raw directory is a workaround 1643 * for buggy clients that will attempt to RETR 1644 * a directory before listing it, e.g., Mozilla. 1645 * Preventing a guest from getting irregular files 1646 * is a simple security measure. 1647 */ 1648 if (S_ISDIR(st.st_mode) || guest) { 1649 reply(550, "%s: not a plain file.", name); 1650 goto done; 1651 } 1652 st.st_size = -1; 1653 /* st.st_blksize is set for all descriptor types */ 1654 } 1655 } 1656 if (restart_point) { 1657 if (type == TYPE_A) { 1658 off_t i, n; 1659 int c; 1660 1661 n = restart_point; 1662 i = 0; 1663 while (i++ < n) { 1664 if ((c=getc(fin)) == EOF) { 1665 perror_reply(550, name); 1666 goto done; 1667 } 1668 if (c == '\n') 1669 i++; 1670 } 1671 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1672 perror_reply(550, name); 1673 goto done; 1674 } 1675 } 1676 dout = dataconn(name, st.st_size, "w"); 1677 if (dout == NULL) 1678 goto done; 1679 time(&start); 1680 send_data(fin, dout, st.st_blksize, st.st_size, 1681 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1682 if (cmd == 0 && guest && stats && byte_count > 0) 1683 logxfer(name, byte_count, start); 1684 (void) fclose(dout); 1685 data = -1; 1686 pdata = -1; 1687 done: 1688 if (cmd == 0) 1689 LOGBYTES("get", name, byte_count); 1690 (*closefunc)(fin); 1691 } 1692 1693 void 1694 store(char *name, char *mode, int unique) 1695 { 1696 int fd; 1697 FILE *fout, *din; 1698 int (*closefunc)(FILE *); 1699 1700 if (*mode == 'a') { /* APPE */ 1701 if (unique) { 1702 /* Programming error */ 1703 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1704 unique = 0; 1705 } 1706 if (guest && noguestmod) { 1707 reply(550, "Appending to existing file denied."); 1708 goto err; 1709 } 1710 restart_point = 0; /* not affected by preceding REST */ 1711 } 1712 if (unique) /* STOU overrides REST */ 1713 restart_point = 0; 1714 if (guest && noguestmod) { 1715 if (restart_point) { /* guest STOR w/REST */ 1716 reply(550, "Modifying existing file denied."); 1717 goto err; 1718 } else /* treat guest STOR as STOU */ 1719 unique = 1; 1720 } 1721 1722 if (restart_point) 1723 mode = "r+"; /* so ASCII manual seek can work */ 1724 if (unique) { 1725 if ((fd = guniquefd(name, &name)) < 0) 1726 goto err; 1727 fout = fdopen(fd, mode); 1728 } else 1729 fout = fopen(name, mode); 1730 closefunc = fclose; 1731 if (fout == NULL) { 1732 perror_reply(553, name); 1733 goto err; 1734 } 1735 byte_count = -1; 1736 if (restart_point) { 1737 if (type == TYPE_A) { 1738 off_t i, n; 1739 int c; 1740 1741 n = restart_point; 1742 i = 0; 1743 while (i++ < n) { 1744 if ((c=getc(fout)) == EOF) { 1745 perror_reply(550, name); 1746 goto done; 1747 } 1748 if (c == '\n') 1749 i++; 1750 } 1751 /* 1752 * We must do this seek to "current" position 1753 * because we are changing from reading to 1754 * writing. 1755 */ 1756 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1757 perror_reply(550, name); 1758 goto done; 1759 } 1760 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1761 perror_reply(550, name); 1762 goto done; 1763 } 1764 } 1765 din = dataconn(name, -1, "r"); 1766 if (din == NULL) 1767 goto done; 1768 if (receive_data(din, fout) == 0) { 1769 if (unique) 1770 reply(226, "Transfer complete (unique file name:%s).", 1771 name); 1772 else 1773 reply(226, "Transfer complete."); 1774 } 1775 (void) fclose(din); 1776 data = -1; 1777 pdata = -1; 1778 done: 1779 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1780 (*closefunc)(fout); 1781 return; 1782 err: 1783 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1784 return; 1785 } 1786 1787 static FILE * 1788 getdatasock(char *mode) 1789 { 1790 int on = 1, s, t, tries; 1791 1792 if (data >= 0) 1793 return (fdopen(data, mode)); 1794 1795 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1796 if (s < 0) 1797 goto bad; 1798 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1799 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1800 /* anchor socket to avoid multi-homing problems */ 1801 data_source = ctrl_addr; 1802 data_source.su_port = htons(dataport); 1803 (void) seteuid(0); 1804 for (tries = 1; ; tries++) { 1805 /* 1806 * We should loop here since it's possible that 1807 * another ftpd instance has passed this point and is 1808 * trying to open a data connection in active mode now. 1809 * Until the other connection is opened, we'll be getting 1810 * EADDRINUSE because no SOCK_STREAM sockets in the system 1811 * can share both local and remote addresses, localIP:20 1812 * and *:* in this case. 1813 */ 1814 if (bind(s, (struct sockaddr *)&data_source, 1815 data_source.su_len) >= 0) 1816 break; 1817 if (errno != EADDRINUSE || tries > 10) 1818 goto bad; 1819 sleep(tries); 1820 } 1821 (void) seteuid(pw->pw_uid); 1822 #ifdef IP_TOS 1823 if (data_source.su_family == AF_INET) 1824 { 1825 on = IPTOS_THROUGHPUT; 1826 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1827 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1828 } 1829 #endif 1830 #ifdef TCP_NOPUSH 1831 /* 1832 * Turn off push flag to keep sender TCP from sending short packets 1833 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1834 * to set the send buffer size as well, but that may not be desirable 1835 * in heavy-load situations. 1836 */ 1837 on = 1; 1838 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1839 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1840 #endif 1841 #ifdef SO_SNDBUF 1842 on = 65536; 1843 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1844 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1845 #endif 1846 1847 return (fdopen(s, mode)); 1848 bad: 1849 /* Return the real value of errno (close may change it) */ 1850 t = errno; 1851 (void) seteuid(pw->pw_uid); 1852 (void) close(s); 1853 errno = t; 1854 return (NULL); 1855 } 1856 1857 static FILE * 1858 dataconn(char *name, off_t size, char *mode) 1859 { 1860 char sizebuf[32]; 1861 FILE *file; 1862 int retry = 0, tos, conerrno; 1863 1864 file_size = size; 1865 byte_count = 0; 1866 if (size != -1) 1867 (void) snprintf(sizebuf, sizeof(sizebuf), 1868 " (%jd bytes)", (intmax_t)size); 1869 else 1870 *sizebuf = '\0'; 1871 if (pdata >= 0) { 1872 union sockunion from; 1873 int flags; 1874 int s, fromlen = ctrl_addr.su_len; 1875 struct timeval timeout; 1876 fd_set set; 1877 1878 FD_ZERO(&set); 1879 FD_SET(pdata, &set); 1880 1881 timeout.tv_usec = 0; 1882 timeout.tv_sec = 120; 1883 1884 /* 1885 * Granted a socket is in the blocking I/O mode, 1886 * accept() will block after a successful select() 1887 * if the selected connection dies in between. 1888 * Therefore set the non-blocking I/O flag here. 1889 */ 1890 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1891 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1892 goto pdata_err; 1893 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1894 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1895 goto pdata_err; 1896 (void) close(pdata); 1897 pdata = s; 1898 /* 1899 * Unset the inherited non-blocking I/O flag 1900 * on the child socket so stdio can work on it. 1901 */ 1902 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1903 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1904 goto pdata_err; 1905 #ifdef IP_TOS 1906 if (from.su_family == AF_INET) 1907 { 1908 tos = IPTOS_THROUGHPUT; 1909 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1910 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1911 } 1912 #endif 1913 reply(150, "Opening %s mode data connection for '%s'%s.", 1914 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1915 return (fdopen(pdata, mode)); 1916 pdata_err: 1917 reply(425, "Can't open data connection."); 1918 (void) close(pdata); 1919 pdata = -1; 1920 return (NULL); 1921 } 1922 if (data >= 0) { 1923 reply(125, "Using existing data connection for '%s'%s.", 1924 name, sizebuf); 1925 usedefault = 1; 1926 return (fdopen(data, mode)); 1927 } 1928 if (usedefault) 1929 data_dest = his_addr; 1930 usedefault = 1; 1931 do { 1932 file = getdatasock(mode); 1933 if (file == NULL) { 1934 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1935 getnameinfo((struct sockaddr *)&data_source, 1936 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1937 portbuf, sizeof(portbuf), 1938 NI_NUMERICHOST|NI_NUMERICSERV); 1939 reply(425, "Can't create data socket (%s,%s): %s.", 1940 hostbuf, portbuf, strerror(errno)); 1941 return (NULL); 1942 } 1943 data = fileno(file); 1944 conerrno = 0; 1945 if (connect(data, (struct sockaddr *)&data_dest, 1946 data_dest.su_len) == 0) 1947 break; 1948 conerrno = errno; 1949 (void) fclose(file); 1950 data = -1; 1951 if (conerrno == EADDRINUSE) { 1952 sleep(swaitint); 1953 retry += swaitint; 1954 } else { 1955 break; 1956 } 1957 } while (retry <= swaitmax); 1958 if (conerrno != 0) { 1959 reply(425, "Can't build data connection: %s.", 1960 strerror(conerrno)); 1961 return (NULL); 1962 } 1963 reply(150, "Opening %s mode data connection for '%s'%s.", 1964 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1965 return (file); 1966 } 1967 1968 /* 1969 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1970 * encapsulation of the data subject to Mode, Structure, and Type. 1971 * 1972 * NB: Form isn't handled. 1973 */ 1974 static int 1975 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 1976 { 1977 int c, cp, filefd, netfd; 1978 char *buf; 1979 off_t cnt; 1980 1981 transflag++; 1982 switch (type) { 1983 1984 case TYPE_A: 1985 cp = '\0'; 1986 while ((c = getc(instr)) != EOF) { 1987 if (recvurg) 1988 goto got_oob; 1989 byte_count++; 1990 if (c == '\n' && cp != '\r') { 1991 if (ferror(outstr)) 1992 goto data_err; 1993 (void) putc('\r', outstr); 1994 } 1995 (void) putc(c, outstr); 1996 cp = c; 1997 } 1998 if (recvurg) 1999 goto got_oob; 2000 fflush(outstr); 2001 transflag = 0; 2002 if (ferror(instr)) 2003 goto file_err; 2004 if (ferror(outstr)) 2005 goto data_err; 2006 reply(226, "Transfer complete."); 2007 return (0); 2008 2009 case TYPE_I: 2010 case TYPE_L: 2011 /* 2012 * isreg is only set if we are not doing restart and we 2013 * are sending a regular file 2014 */ 2015 netfd = fileno(outstr); 2016 filefd = fileno(instr); 2017 2018 if (isreg) { 2019 2020 char *msg = "Transfer complete."; 2021 off_t offset; 2022 int err; 2023 2024 cnt = offset = 0; 2025 2026 while (filesize > 0) { 2027 err = sendfile(filefd, netfd, offset, 0, 2028 NULL, &cnt, 0); 2029 /* 2030 * Calculate byte_count before OOB processing. 2031 * It can be used in myoob() later. 2032 */ 2033 byte_count += cnt; 2034 if (recvurg) 2035 goto got_oob; 2036 offset += cnt; 2037 filesize -= cnt; 2038 2039 if (err == -1) { 2040 if (cnt == 0 && offset == 0) 2041 goto oldway; 2042 2043 goto data_err; 2044 } 2045 2046 /* 2047 * We hit the EOF prematurely. 2048 * Perhaps the file was externally truncated. 2049 */ 2050 if (cnt == 0) { 2051 msg = "Transfer finished due to " 2052 "premature end of file."; 2053 break; 2054 } 2055 } 2056 2057 transflag = 0; 2058 reply(226, msg); 2059 return (0); 2060 } 2061 2062 oldway: 2063 if ((buf = malloc(blksize)) == NULL) { 2064 transflag = 0; 2065 reply(451, "Ran out of memory."); 2066 return (-1); 2067 } 2068 2069 while ((cnt = read(filefd, buf, blksize)) > 0 && 2070 write(netfd, buf, cnt) == cnt) 2071 byte_count += cnt; 2072 transflag = 0; 2073 (void)free(buf); 2074 if (cnt != 0) { 2075 if (cnt < 0) 2076 goto file_err; 2077 goto data_err; 2078 } 2079 reply(226, "Transfer complete."); 2080 return (0); 2081 default: 2082 transflag = 0; 2083 reply(550, "Unimplemented TYPE %d in send_data.", type); 2084 return (-1); 2085 } 2086 2087 data_err: 2088 transflag = 0; 2089 perror_reply(426, "Data connection"); 2090 return (-1); 2091 2092 file_err: 2093 transflag = 0; 2094 perror_reply(551, "Error on input file"); 2095 return (-1); 2096 2097 got_oob: 2098 myoob(); 2099 recvurg = 0; 2100 transflag = 0; 2101 return (-1); 2102 } 2103 2104 /* 2105 * Transfer data from peer to "outstr" using the appropriate encapulation of 2106 * the data subject to Mode, Structure, and Type. 2107 * 2108 * N.B.: Form isn't handled. 2109 */ 2110 static int 2111 receive_data(FILE *instr, FILE *outstr) 2112 { 2113 int c; 2114 int cnt, bare_lfs; 2115 char buf[BUFSIZ]; 2116 2117 transflag++; 2118 bare_lfs = 0; 2119 2120 switch (type) { 2121 2122 case TYPE_I: 2123 case TYPE_L: 2124 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 2125 if (recvurg) 2126 goto got_oob; 2127 if (write(fileno(outstr), buf, cnt) != cnt) 2128 goto file_err; 2129 byte_count += cnt; 2130 } 2131 if (recvurg) 2132 goto got_oob; 2133 if (cnt < 0) 2134 goto data_err; 2135 transflag = 0; 2136 return (0); 2137 2138 case TYPE_E: 2139 reply(553, "TYPE E not implemented."); 2140 transflag = 0; 2141 return (-1); 2142 2143 case TYPE_A: 2144 while ((c = getc(instr)) != EOF) { 2145 if (recvurg) 2146 goto got_oob; 2147 byte_count++; 2148 if (c == '\n') 2149 bare_lfs++; 2150 while (c == '\r') { 2151 if (ferror(outstr)) 2152 goto data_err; 2153 if ((c = getc(instr)) != '\n') { 2154 (void) putc ('\r', outstr); 2155 if (c == '\0' || c == EOF) 2156 goto contin2; 2157 } 2158 } 2159 (void) putc(c, outstr); 2160 contin2: ; 2161 } 2162 if (recvurg) 2163 goto got_oob; 2164 fflush(outstr); 2165 if (ferror(instr)) 2166 goto data_err; 2167 if (ferror(outstr)) 2168 goto file_err; 2169 transflag = 0; 2170 if (bare_lfs) { 2171 lreply(226, 2172 "WARNING! %d bare linefeeds received in ASCII mode.", 2173 bare_lfs); 2174 (void)printf(" File may not have transferred correctly.\r\n"); 2175 } 2176 return (0); 2177 default: 2178 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2179 transflag = 0; 2180 return (-1); 2181 } 2182 2183 data_err: 2184 transflag = 0; 2185 perror_reply(426, "Data connection"); 2186 return (-1); 2187 2188 file_err: 2189 transflag = 0; 2190 perror_reply(452, "Error writing to file"); 2191 return (-1); 2192 2193 got_oob: 2194 myoob(); 2195 recvurg = 0; 2196 transflag = 0; 2197 return (-1); 2198 } 2199 2200 void 2201 statfilecmd(char *filename) 2202 { 2203 FILE *fin; 2204 int atstart; 2205 int c, code; 2206 char line[LINE_MAX]; 2207 struct stat st; 2208 2209 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2210 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2211 fin = ftpd_popen(line, "r"); 2212 lreply(code, "Status of %s:", filename); 2213 atstart = 1; 2214 while ((c = getc(fin)) != EOF) { 2215 if (c == '\n') { 2216 if (ferror(stdout)){ 2217 perror_reply(421, "Control connection"); 2218 (void) ftpd_pclose(fin); 2219 dologout(1); 2220 /* NOTREACHED */ 2221 } 2222 if (ferror(fin)) { 2223 perror_reply(551, filename); 2224 (void) ftpd_pclose(fin); 2225 return; 2226 } 2227 (void) putc('\r', stdout); 2228 } 2229 /* 2230 * RFC 959 says neutral text should be prepended before 2231 * a leading 3-digit number followed by whitespace, but 2232 * many ftp clients can be confused by any leading digits, 2233 * as a matter of fact. 2234 */ 2235 if (atstart && isdigit(c)) 2236 (void) putc(' ', stdout); 2237 (void) putc(c, stdout); 2238 atstart = (c == '\n'); 2239 } 2240 (void) ftpd_pclose(fin); 2241 reply(code, "End of status."); 2242 } 2243 2244 void 2245 statcmd(void) 2246 { 2247 union sockunion *su; 2248 u_char *a, *p; 2249 char hname[NI_MAXHOST]; 2250 int ispassive; 2251 2252 if (hostinfo) { 2253 lreply(211, "%s FTP server status:", hostname); 2254 printf(" %s\r\n", version); 2255 } else 2256 lreply(211, "FTP server status:"); 2257 printf(" Connected to %s", remotehost); 2258 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2259 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2260 if (strcmp(hname, remotehost) != 0) 2261 printf(" (%s)", hname); 2262 } 2263 printf("\r\n"); 2264 if (logged_in) { 2265 if (guest) 2266 printf(" Logged in anonymously\r\n"); 2267 else 2268 printf(" Logged in as %s\r\n", pw->pw_name); 2269 } else if (askpasswd) 2270 printf(" Waiting for password\r\n"); 2271 else 2272 printf(" Waiting for user name\r\n"); 2273 printf(" TYPE: %s", typenames[type]); 2274 if (type == TYPE_A || type == TYPE_E) 2275 printf(", FORM: %s", formnames[form]); 2276 if (type == TYPE_L) 2277 #if CHAR_BIT == 8 2278 printf(" %d", CHAR_BIT); 2279 #else 2280 printf(" %d", bytesize); /* need definition! */ 2281 #endif 2282 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2283 strunames[stru], modenames[mode]); 2284 if (data != -1) 2285 printf(" Data connection open\r\n"); 2286 else if (pdata != -1) { 2287 ispassive = 1; 2288 su = &pasv_addr; 2289 goto printaddr; 2290 } else if (usedefault == 0) { 2291 ispassive = 0; 2292 su = &data_dest; 2293 printaddr: 2294 #define UC(b) (((int) b) & 0xff) 2295 if (epsvall) { 2296 printf(" EPSV only mode (EPSV ALL)\r\n"); 2297 goto epsvonly; 2298 } 2299 2300 /* PORT/PASV */ 2301 if (su->su_family == AF_INET) { 2302 a = (u_char *) &su->su_sin.sin_addr; 2303 p = (u_char *) &su->su_sin.sin_port; 2304 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2305 ispassive ? "PASV" : "PORT", 2306 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2307 UC(p[0]), UC(p[1])); 2308 } 2309 2310 /* LPRT/LPSV */ 2311 { 2312 int alen, af, i; 2313 2314 switch (su->su_family) { 2315 case AF_INET: 2316 a = (u_char *) &su->su_sin.sin_addr; 2317 p = (u_char *) &su->su_sin.sin_port; 2318 alen = sizeof(su->su_sin.sin_addr); 2319 af = 4; 2320 break; 2321 case AF_INET6: 2322 a = (u_char *) &su->su_sin6.sin6_addr; 2323 p = (u_char *) &su->su_sin6.sin6_port; 2324 alen = sizeof(su->su_sin6.sin6_addr); 2325 af = 6; 2326 break; 2327 default: 2328 af = 0; 2329 break; 2330 } 2331 if (af) { 2332 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2333 af, alen); 2334 for (i = 0; i < alen; i++) 2335 printf("%d,", UC(a[i])); 2336 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2337 } 2338 } 2339 2340 epsvonly:; 2341 /* EPRT/EPSV */ 2342 { 2343 int af; 2344 2345 switch (su->su_family) { 2346 case AF_INET: 2347 af = 1; 2348 break; 2349 case AF_INET6: 2350 af = 2; 2351 break; 2352 default: 2353 af = 0; 2354 break; 2355 } 2356 if (af) { 2357 union sockunion tmp; 2358 2359 tmp = *su; 2360 if (tmp.su_family == AF_INET6) 2361 tmp.su_sin6.sin6_scope_id = 0; 2362 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2363 hname, sizeof(hname) - 1, NULL, 0, 2364 NI_NUMERICHOST)) { 2365 printf(" %s |%d|%s|%d|\r\n", 2366 ispassive ? "EPSV" : "EPRT", 2367 af, hname, htons(tmp.su_port)); 2368 } 2369 } 2370 } 2371 #undef UC 2372 } else 2373 printf(" No data connection\r\n"); 2374 reply(211, "End of status."); 2375 } 2376 2377 void 2378 fatalerror(char *s) 2379 { 2380 2381 reply(451, "Error in server: %s", s); 2382 reply(221, "Closing connection due to server error."); 2383 dologout(0); 2384 /* NOTREACHED */ 2385 } 2386 2387 void 2388 reply(int n, const char *fmt, ...) 2389 { 2390 va_list ap; 2391 2392 (void)printf("%d ", n); 2393 va_start(ap, fmt); 2394 (void)vprintf(fmt, ap); 2395 va_end(ap); 2396 (void)printf("\r\n"); 2397 (void)fflush(stdout); 2398 if (ftpdebug) { 2399 syslog(LOG_DEBUG, "<--- %d ", n); 2400 va_start(ap, fmt); 2401 vsyslog(LOG_DEBUG, fmt, ap); 2402 va_end(ap); 2403 } 2404 } 2405 2406 void 2407 lreply(int n, const char *fmt, ...) 2408 { 2409 va_list ap; 2410 2411 (void)printf("%d- ", n); 2412 va_start(ap, fmt); 2413 (void)vprintf(fmt, ap); 2414 va_end(ap); 2415 (void)printf("\r\n"); 2416 (void)fflush(stdout); 2417 if (ftpdebug) { 2418 syslog(LOG_DEBUG, "<--- %d- ", n); 2419 va_start(ap, fmt); 2420 vsyslog(LOG_DEBUG, fmt, ap); 2421 va_end(ap); 2422 } 2423 } 2424 2425 static void 2426 ack(char *s) 2427 { 2428 2429 reply(250, "%s command successful.", s); 2430 } 2431 2432 void 2433 nack(char *s) 2434 { 2435 2436 reply(502, "%s command not implemented.", s); 2437 } 2438 2439 /* ARGSUSED */ 2440 void 2441 yyerror(char *s) 2442 { 2443 char *cp; 2444 2445 if ((cp = strchr(cbuf,'\n'))) 2446 *cp = '\0'; 2447 reply(500, "%s: command not understood.", cbuf); 2448 } 2449 2450 void 2451 delete(char *name) 2452 { 2453 struct stat st; 2454 2455 LOGCMD("delete", name); 2456 if (lstat(name, &st) < 0) { 2457 perror_reply(550, name); 2458 return; 2459 } 2460 if (S_ISDIR(st.st_mode)) { 2461 if (rmdir(name) < 0) { 2462 perror_reply(550, name); 2463 return; 2464 } 2465 goto done; 2466 } 2467 if (guest && noguestmod) { 2468 reply(550, "Operation not permitted."); 2469 return; 2470 } 2471 if (unlink(name) < 0) { 2472 perror_reply(550, name); 2473 return; 2474 } 2475 done: 2476 ack("DELE"); 2477 } 2478 2479 void 2480 cwd(char *path) 2481 { 2482 2483 if (chdir(path) < 0) 2484 perror_reply(550, path); 2485 else 2486 ack("CWD"); 2487 } 2488 2489 void 2490 makedir(char *name) 2491 { 2492 char *s; 2493 2494 LOGCMD("mkdir", name); 2495 if (guest && noguestmkd) 2496 reply(550, "Operation not permitted."); 2497 else if (mkdir(name, 0777) < 0) 2498 perror_reply(550, name); 2499 else { 2500 if ((s = doublequote(name)) == NULL) 2501 fatalerror("Ran out of memory."); 2502 reply(257, "\"%s\" directory created.", s); 2503 free(s); 2504 } 2505 } 2506 2507 void 2508 removedir(char *name) 2509 { 2510 2511 LOGCMD("rmdir", name); 2512 if (rmdir(name) < 0) 2513 perror_reply(550, name); 2514 else 2515 ack("RMD"); 2516 } 2517 2518 void 2519 pwd(void) 2520 { 2521 char *s, path[MAXPATHLEN + 1]; 2522 2523 if (getcwd(path, sizeof(path)) == NULL) 2524 perror_reply(550, "Get current directory"); 2525 else { 2526 if ((s = doublequote(path)) == NULL) 2527 fatalerror("Ran out of memory."); 2528 reply(257, "\"%s\" is current directory.", s); 2529 free(s); 2530 } 2531 } 2532 2533 char * 2534 renamefrom(char *name) 2535 { 2536 struct stat st; 2537 2538 if (guest && noguestmod) { 2539 reply(550, "Operation not permitted."); 2540 return (NULL); 2541 } 2542 if (lstat(name, &st) < 0) { 2543 perror_reply(550, name); 2544 return (NULL); 2545 } 2546 reply(350, "File exists, ready for destination name."); 2547 return (name); 2548 } 2549 2550 void 2551 renamecmd(char *from, char *to) 2552 { 2553 struct stat st; 2554 2555 LOGCMD2("rename", from, to); 2556 2557 if (guest && (stat(to, &st) == 0)) { 2558 reply(550, "%s: permission denied.", to); 2559 return; 2560 } 2561 2562 if (rename(from, to) < 0) 2563 perror_reply(550, "rename"); 2564 else 2565 ack("RNTO"); 2566 } 2567 2568 static void 2569 dolog(struct sockaddr *who) 2570 { 2571 int error; 2572 2573 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2574 2575 #ifdef SETPROCTITLE 2576 #ifdef VIRTUAL_HOSTING 2577 if (thishost != firsthost) 2578 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2579 remotehost, hostname); 2580 else 2581 #endif 2582 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2583 remotehost); 2584 setproctitle("%s", proctitle); 2585 #endif /* SETPROCTITLE */ 2586 2587 if (logging) { 2588 #ifdef VIRTUAL_HOSTING 2589 if (thishost != firsthost) 2590 syslog(LOG_INFO, "connection from %s (to %s)", 2591 remotehost, hostname); 2592 else 2593 #endif 2594 { 2595 char who_name[MAXHOSTNAMELEN]; 2596 2597 error = getnameinfo(who, who->sa_len, 2598 who_name, sizeof(who_name) - 1, 2599 NULL, 0, NI_NUMERICHOST); 2600 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2601 error == 0 ? who_name : ""); 2602 } 2603 } 2604 } 2605 2606 /* 2607 * Record logout in wtmp file 2608 * and exit with supplied status. 2609 */ 2610 void 2611 dologout(int status) 2612 { 2613 /* 2614 * Prevent reception of SIGURG from resulting in a resumption 2615 * back to the main program loop. 2616 */ 2617 transflag = 0; 2618 2619 if (logged_in && dowtmp) { 2620 (void) seteuid(0); 2621 ftpd_logwtmp(ttyline, "", NULL); 2622 } 2623 /* beware of flushing buffers after a SIGPIPE */ 2624 _exit(status); 2625 } 2626 2627 static void 2628 sigurg(int signo) 2629 { 2630 2631 recvurg = 1; 2632 } 2633 2634 static void 2635 myoob(void) 2636 { 2637 char *cp; 2638 2639 /* only process if transfer occurring */ 2640 if (!transflag) 2641 return; 2642 cp = tmpline; 2643 if (getline(cp, 7, stdin) == NULL) { 2644 reply(221, "You could at least say goodbye."); 2645 dologout(0); 2646 } 2647 upper(cp); 2648 if (strcmp(cp, "ABOR\r\n") == 0) { 2649 tmpline[0] = '\0'; 2650 reply(426, "Transfer aborted. Data connection closed."); 2651 reply(226, "Abort successful."); 2652 } 2653 if (strcmp(cp, "STAT\r\n") == 0) { 2654 tmpline[0] = '\0'; 2655 if (file_size != -1) 2656 reply(213, "Status: %jd of %jd bytes transferred.", 2657 (intmax_t)byte_count, (intmax_t)file_size); 2658 else 2659 reply(213, "Status: %jd bytes transferred.", 2660 (intmax_t)byte_count); 2661 } 2662 } 2663 2664 /* 2665 * Note: a response of 425 is not mentioned as a possible response to 2666 * the PASV command in RFC959. However, it has been blessed as 2667 * a legitimate response by Jon Postel in a telephone conversation 2668 * with Rick Adams on 25 Jan 89. 2669 */ 2670 void 2671 passive(void) 2672 { 2673 int len, on; 2674 char *p, *a; 2675 2676 if (pdata >= 0) /* close old port if one set */ 2677 close(pdata); 2678 2679 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2680 if (pdata < 0) { 2681 perror_reply(425, "Can't open passive connection"); 2682 return; 2683 } 2684 on = 1; 2685 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2686 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2687 2688 (void) seteuid(0); 2689 2690 #ifdef IP_PORTRANGE 2691 if (ctrl_addr.su_family == AF_INET) { 2692 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2693 : IP_PORTRANGE_DEFAULT; 2694 2695 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2696 &on, sizeof(on)) < 0) 2697 goto pasv_error; 2698 } 2699 #endif 2700 #ifdef IPV6_PORTRANGE 2701 if (ctrl_addr.su_family == AF_INET6) { 2702 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2703 : IPV6_PORTRANGE_DEFAULT; 2704 2705 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2706 &on, sizeof(on)) < 0) 2707 goto pasv_error; 2708 } 2709 #endif 2710 2711 pasv_addr = ctrl_addr; 2712 pasv_addr.su_port = 0; 2713 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2714 goto pasv_error; 2715 2716 (void) seteuid(pw->pw_uid); 2717 2718 len = sizeof(pasv_addr); 2719 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2720 goto pasv_error; 2721 if (listen(pdata, 1) < 0) 2722 goto pasv_error; 2723 if (pasv_addr.su_family == AF_INET) 2724 a = (char *) &pasv_addr.su_sin.sin_addr; 2725 else if (pasv_addr.su_family == AF_INET6 && 2726 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2727 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2728 else 2729 goto pasv_error; 2730 2731 p = (char *) &pasv_addr.su_port; 2732 2733 #define UC(b) (((int) b) & 0xff) 2734 2735 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2736 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2737 return; 2738 2739 pasv_error: 2740 (void) seteuid(pw->pw_uid); 2741 (void) close(pdata); 2742 pdata = -1; 2743 perror_reply(425, "Can't open passive connection"); 2744 return; 2745 } 2746 2747 /* 2748 * Long Passive defined in RFC 1639. 2749 * 228 Entering Long Passive Mode 2750 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2751 */ 2752 2753 void 2754 long_passive(char *cmd, int pf) 2755 { 2756 int len, on; 2757 char *p, *a; 2758 2759 if (pdata >= 0) /* close old port if one set */ 2760 close(pdata); 2761 2762 if (pf != PF_UNSPEC) { 2763 if (ctrl_addr.su_family != pf) { 2764 switch (ctrl_addr.su_family) { 2765 case AF_INET: 2766 pf = 1; 2767 break; 2768 case AF_INET6: 2769 pf = 2; 2770 break; 2771 default: 2772 pf = 0; 2773 break; 2774 } 2775 /* 2776 * XXX 2777 * only EPRT/EPSV ready clients will understand this 2778 */ 2779 if (strcmp(cmd, "EPSV") == 0 && pf) { 2780 reply(522, "Network protocol mismatch, " 2781 "use (%d)", pf); 2782 } else 2783 reply(501, "Network protocol mismatch."); /*XXX*/ 2784 2785 return; 2786 } 2787 } 2788 2789 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2790 if (pdata < 0) { 2791 perror_reply(425, "Can't open passive connection"); 2792 return; 2793 } 2794 on = 1; 2795 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2796 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2797 2798 (void) seteuid(0); 2799 2800 pasv_addr = ctrl_addr; 2801 pasv_addr.su_port = 0; 2802 len = pasv_addr.su_len; 2803 2804 #ifdef IP_PORTRANGE 2805 if (ctrl_addr.su_family == AF_INET) { 2806 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2807 : IP_PORTRANGE_DEFAULT; 2808 2809 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2810 &on, sizeof(on)) < 0) 2811 goto pasv_error; 2812 } 2813 #endif 2814 #ifdef IPV6_PORTRANGE 2815 if (ctrl_addr.su_family == AF_INET6) { 2816 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2817 : IPV6_PORTRANGE_DEFAULT; 2818 2819 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2820 &on, sizeof(on)) < 0) 2821 goto pasv_error; 2822 } 2823 #endif 2824 2825 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2826 goto pasv_error; 2827 2828 (void) seteuid(pw->pw_uid); 2829 2830 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2831 goto pasv_error; 2832 if (listen(pdata, 1) < 0) 2833 goto pasv_error; 2834 2835 #define UC(b) (((int) b) & 0xff) 2836 2837 if (strcmp(cmd, "LPSV") == 0) { 2838 p = (char *)&pasv_addr.su_port; 2839 switch (pasv_addr.su_family) { 2840 case AF_INET: 2841 a = (char *) &pasv_addr.su_sin.sin_addr; 2842 v4_reply: 2843 reply(228, 2844 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2845 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2846 2, UC(p[0]), UC(p[1])); 2847 return; 2848 case AF_INET6: 2849 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2850 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2851 goto v4_reply; 2852 } 2853 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2854 reply(228, 2855 "Entering Long Passive Mode " 2856 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2857 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2858 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2859 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2860 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2861 2, UC(p[0]), UC(p[1])); 2862 return; 2863 } 2864 } else if (strcmp(cmd, "EPSV") == 0) { 2865 switch (pasv_addr.su_family) { 2866 case AF_INET: 2867 case AF_INET6: 2868 reply(229, "Entering Extended Passive Mode (|||%d|)", 2869 ntohs(pasv_addr.su_port)); 2870 return; 2871 } 2872 } else { 2873 /* more proper error code? */ 2874 } 2875 2876 pasv_error: 2877 (void) seteuid(pw->pw_uid); 2878 (void) close(pdata); 2879 pdata = -1; 2880 perror_reply(425, "Can't open passive connection"); 2881 return; 2882 } 2883 2884 /* 2885 * Generate unique name for file with basename "local" 2886 * and open the file in order to avoid possible races. 2887 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2888 * Return descriptor to the file, set "name" to its name. 2889 * 2890 * Generates failure reply on error. 2891 */ 2892 static int 2893 guniquefd(char *local, char **name) 2894 { 2895 static char new[MAXPATHLEN]; 2896 struct stat st; 2897 char *cp; 2898 int count; 2899 int fd; 2900 2901 cp = strrchr(local, '/'); 2902 if (cp) 2903 *cp = '\0'; 2904 if (stat(cp ? local : ".", &st) < 0) { 2905 perror_reply(553, cp ? local : "."); 2906 return (-1); 2907 } 2908 if (cp) { 2909 /* 2910 * Let not overwrite dirname with counter suffix. 2911 * -4 is for /nn\0 2912 * In this extreme case dot won't be put in front of suffix. 2913 */ 2914 if (strlen(local) > sizeof(new) - 4) { 2915 reply(553, "Pathname too long."); 2916 return (-1); 2917 } 2918 *cp = '/'; 2919 } 2920 /* -4 is for the .nn<null> we put on the end below */ 2921 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2922 cp = new + strlen(new); 2923 /* 2924 * Don't generate dotfile unless requested explicitly. 2925 * This covers the case when basename gets truncated off 2926 * by buffer size. 2927 */ 2928 if (cp > new && cp[-1] != '/') 2929 *cp++ = '.'; 2930 for (count = 0; count < 100; count++) { 2931 /* At count 0 try unmodified name */ 2932 if (count) 2933 (void)sprintf(cp, "%d", count); 2934 if ((fd = open(count ? new : local, 2935 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2936 *name = count ? new : local; 2937 return (fd); 2938 } 2939 if (errno != EEXIST) { 2940 perror_reply(553, count ? new : local); 2941 return (-1); 2942 } 2943 } 2944 reply(452, "Unique file name cannot be created."); 2945 return (-1); 2946 } 2947 2948 /* 2949 * Format and send reply containing system error number. 2950 */ 2951 void 2952 perror_reply(int code, char *string) 2953 { 2954 2955 reply(code, "%s: %s.", string, strerror(errno)); 2956 } 2957 2958 static char *onefile[] = { 2959 "", 2960 0 2961 }; 2962 2963 void 2964 send_file_list(char *whichf) 2965 { 2966 struct stat st; 2967 DIR *dirp = NULL; 2968 struct dirent *dir; 2969 FILE *dout = NULL; 2970 char **dirlist, *dirname; 2971 int simple = 0; 2972 int freeglob = 0; 2973 glob_t gl; 2974 2975 if (strpbrk(whichf, "~{[*?") != NULL) { 2976 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2977 2978 memset(&gl, 0, sizeof(gl)); 2979 gl.gl_matchc = MAXGLOBARGS; 2980 flags |= GLOB_LIMIT; 2981 freeglob = 1; 2982 if (glob(whichf, flags, 0, &gl)) { 2983 reply(550, "No matching files found."); 2984 goto out; 2985 } else if (gl.gl_pathc == 0) { 2986 errno = ENOENT; 2987 perror_reply(550, whichf); 2988 goto out; 2989 } 2990 dirlist = gl.gl_pathv; 2991 } else { 2992 onefile[0] = whichf; 2993 dirlist = onefile; 2994 simple = 1; 2995 } 2996 2997 while ((dirname = *dirlist++)) { 2998 if (stat(dirname, &st) < 0) { 2999 /* 3000 * If user typed "ls -l", etc, and the client 3001 * used NLST, do what the user meant. 3002 */ 3003 if (dirname[0] == '-' && *dirlist == NULL && 3004 transflag == 0) { 3005 retrieve(_PATH_LS " %s", dirname); 3006 goto out; 3007 } 3008 perror_reply(550, whichf); 3009 if (dout != NULL) { 3010 (void) fclose(dout); 3011 transflag = 0; 3012 data = -1; 3013 pdata = -1; 3014 } 3015 goto out; 3016 } 3017 3018 if (S_ISREG(st.st_mode)) { 3019 if (dout == NULL) { 3020 dout = dataconn("file list", -1, "w"); 3021 if (dout == NULL) 3022 goto out; 3023 transflag++; 3024 } 3025 fprintf(dout, "%s%s\n", dirname, 3026 type == TYPE_A ? "\r" : ""); 3027 byte_count += strlen(dirname) + 1; 3028 continue; 3029 } else if (!S_ISDIR(st.st_mode)) 3030 continue; 3031 3032 if ((dirp = opendir(dirname)) == NULL) 3033 continue; 3034 3035 while ((dir = readdir(dirp)) != NULL) { 3036 char nbuf[MAXPATHLEN]; 3037 3038 if (recvurg) { 3039 myoob(); 3040 recvurg = 0; 3041 transflag = 0; 3042 goto out; 3043 } 3044 3045 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3046 continue; 3047 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3048 dir->d_namlen == 2) 3049 continue; 3050 3051 snprintf(nbuf, sizeof(nbuf), 3052 "%s/%s", dirname, dir->d_name); 3053 3054 /* 3055 * We have to do a stat to insure it's 3056 * not a directory or special file. 3057 */ 3058 if (simple || (stat(nbuf, &st) == 0 && 3059 S_ISREG(st.st_mode))) { 3060 if (dout == NULL) { 3061 dout = dataconn("file list", -1, "w"); 3062 if (dout == NULL) 3063 goto out; 3064 transflag++; 3065 } 3066 if (nbuf[0] == '.' && nbuf[1] == '/') 3067 fprintf(dout, "%s%s\n", &nbuf[2], 3068 type == TYPE_A ? "\r" : ""); 3069 else 3070 fprintf(dout, "%s%s\n", nbuf, 3071 type == TYPE_A ? "\r" : ""); 3072 byte_count += strlen(nbuf) + 1; 3073 } 3074 } 3075 (void) closedir(dirp); 3076 } 3077 3078 if (dout == NULL) 3079 reply(550, "No files found."); 3080 else if (ferror(dout) != 0) 3081 perror_reply(550, "Data connection"); 3082 else 3083 reply(226, "Transfer complete."); 3084 3085 transflag = 0; 3086 if (dout != NULL) 3087 (void) fclose(dout); 3088 data = -1; 3089 pdata = -1; 3090 out: 3091 if (freeglob) { 3092 freeglob = 0; 3093 globfree(&gl); 3094 } 3095 } 3096 3097 void 3098 reapchild(int signo) 3099 { 3100 while (waitpid(-1, NULL, WNOHANG) > 0); 3101 } 3102 3103 #ifdef OLD_SETPROCTITLE 3104 /* 3105 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3106 * Warning, since this is usually started from inetd.conf, it often doesn't 3107 * have much of an environment or arglist to overwrite. 3108 */ 3109 void 3110 setproctitle(const char *fmt, ...) 3111 { 3112 int i; 3113 va_list ap; 3114 char *p, *bp, ch; 3115 char buf[LINE_MAX]; 3116 3117 va_start(ap, fmt); 3118 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3119 3120 /* make ps print our process name */ 3121 p = Argv[0]; 3122 *p++ = '-'; 3123 3124 i = strlen(buf); 3125 if (i > LastArgv - p - 2) { 3126 i = LastArgv - p - 2; 3127 buf[i] = '\0'; 3128 } 3129 bp = buf; 3130 while (ch = *bp++) 3131 if (ch != '\n' && ch != '\r') 3132 *p++ = ch; 3133 while (p < LastArgv) 3134 *p++ = ' '; 3135 } 3136 #endif /* OLD_SETPROCTITLE */ 3137 3138 static void 3139 appendf(char **strp, char *fmt, ...) 3140 { 3141 va_list ap; 3142 char *ostr, *p; 3143 3144 va_start(ap, fmt); 3145 vasprintf(&p, fmt, ap); 3146 va_end(ap); 3147 if (p == NULL) 3148 fatalerror("Ran out of memory."); 3149 if (*strp == NULL) 3150 *strp = p; 3151 else { 3152 ostr = *strp; 3153 asprintf(strp, "%s%s", ostr, p); 3154 if (*strp == NULL) 3155 fatalerror("Ran out of memory."); 3156 free(ostr); 3157 } 3158 } 3159 3160 static void 3161 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3162 { 3163 char *msg = NULL; 3164 char wd[MAXPATHLEN + 1]; 3165 3166 if (logging <= 1) 3167 return; 3168 /* If either filename isn't absolute, get current dir for log message. */ 3169 if ((file1 && file1[0] != '/') || (file2 && file2[0] != '/')) { 3170 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3171 strcpy(wd, strerror(errno)); 3172 } else 3173 wd[0] = '\0'; 3174 3175 appendf(&msg, "%s", cmd); 3176 if (file1) 3177 appendf(&msg, " %s", file1); 3178 if (file2) 3179 appendf(&msg, " %s", file2); 3180 if (cnt >= 0) 3181 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3182 if (wd[0]) 3183 appendf(&msg, " (wd: %s)", wd); 3184 if (guest || dochroot) 3185 appendf(&msg, " (chroot: %s)", chrootdir); 3186 syslog(LOG_INFO, "%s", msg); 3187 free(msg); 3188 } 3189 3190 static void 3191 logxfer(char *name, off_t size, time_t start) 3192 { 3193 char buf[MAXPATHLEN + 1024]; 3194 char path[MAXPATHLEN + 1]; 3195 time_t now; 3196 3197 if (statfd >= 0) { 3198 time(&now); 3199 if (realpath(name, path) == NULL) { 3200 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3201 return; 3202 } 3203 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3204 ctime(&now)+4, ident, remotehost, 3205 path, (intmax_t)size, 3206 (long)(now - start + (now == start))); 3207 write(statfd, buf, strlen(buf)); 3208 } 3209 } 3210 3211 static char * 3212 doublequote(char *s) 3213 { 3214 int n; 3215 char *p, *s2; 3216 3217 for (p = s, n = 0; *p; p++) 3218 if (*p == '"') 3219 n++; 3220 3221 if ((s2 = malloc(p - s + n + 1)) == NULL) 3222 return (NULL); 3223 3224 for (p = s2; *s; s++, p++) { 3225 if ((*p = *s) == '"') 3226 *(++p) = '"'; 3227 } 3228 *p = '\0'; 3229 3230 return (s2); 3231 } 3232 3233 /* setup server socket for specified address family */ 3234 /* if af is PF_UNSPEC more than one socket may be returned */ 3235 /* the returned list is dynamically allocated, so caller needs to free it */ 3236 static int * 3237 socksetup(int af, char *bindname, const char *bindport) 3238 { 3239 struct addrinfo hints, *res, *r; 3240 int error, maxs, *s, *socks; 3241 const int on = 1; 3242 3243 memset(&hints, 0, sizeof(hints)); 3244 hints.ai_flags = AI_PASSIVE; 3245 hints.ai_family = af; 3246 hints.ai_socktype = SOCK_STREAM; 3247 error = getaddrinfo(bindname, bindport, &hints, &res); 3248 if (error) { 3249 syslog(LOG_ERR, "%s", gai_strerror(error)); 3250 if (error == EAI_SYSTEM) 3251 syslog(LOG_ERR, "%s", strerror(errno)); 3252 return NULL; 3253 } 3254 3255 /* Count max number of sockets we may open */ 3256 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3257 ; 3258 socks = malloc((maxs + 1) * sizeof(int)); 3259 if (!socks) { 3260 freeaddrinfo(res); 3261 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3262 return NULL; 3263 } 3264 3265 *socks = 0; /* num of sockets counter at start of array */ 3266 s = socks + 1; 3267 for (r = res; r; r = r->ai_next) { 3268 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3269 if (*s < 0) { 3270 syslog(LOG_DEBUG, "control socket: %m"); 3271 continue; 3272 } 3273 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3274 &on, sizeof(on)) < 0) 3275 syslog(LOG_WARNING, 3276 "control setsockopt (SO_REUSEADDR): %m"); 3277 if (r->ai_family == AF_INET6) { 3278 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3279 &on, sizeof(on)) < 0) 3280 syslog(LOG_WARNING, 3281 "control setsockopt (IPV6_V6ONLY): %m"); 3282 } 3283 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3284 syslog(LOG_DEBUG, "control bind: %m"); 3285 close(*s); 3286 continue; 3287 } 3288 (*socks)++; 3289 s++; 3290 } 3291 3292 if (res) 3293 freeaddrinfo(res); 3294 3295 if (*socks == 0) { 3296 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3297 free(socks); 3298 return NULL; 3299 } 3300 return(socks); 3301 } 3302