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[NI_MAXHOST]; 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 * Prevent diagnostic messages from appearing on stderr. 278 * We run as a daemon or from inetd; in both cases, there's 279 * more reason in logging to syslog. 280 */ 281 (void) freopen(_PATH_DEVNULL, "w", stderr); 282 opterr = 0; 283 284 /* 285 * LOG_NDELAY sets up the logging connection immediately, 286 * necessary for anonymous ftp's that chroot and can't do it later. 287 */ 288 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 289 290 while ((ch = getopt(argc, argv, 291 "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 292 switch (ch) { 293 case '4': 294 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 295 break; 296 297 case '6': 298 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 299 break; 300 301 case 'a': 302 bindname = optarg; 303 break; 304 305 case 'A': 306 anon_only = 1; 307 break; 308 309 case 'd': 310 ftpdebug++; 311 break; 312 313 case 'D': 314 daemon_mode++; 315 break; 316 317 case 'E': 318 noepsv = 1; 319 break; 320 321 case 'h': 322 hostinfo = 0; 323 break; 324 325 case 'l': 326 logging++; /* > 1 == extra logging */ 327 break; 328 329 case 'm': 330 noguestmod = 0; 331 break; 332 333 case 'M': 334 noguestmkd = 1; 335 break; 336 337 case 'o': 338 noretr = 1; 339 break; 340 341 case 'O': 342 noguestretr = 1; 343 break; 344 345 case 'p': 346 pid_file = optarg; 347 break; 348 349 case 'P': 350 bindport = optarg; 351 break; 352 353 case 'r': 354 readonly = 1; 355 break; 356 357 case 'R': 358 paranoid = 0; 359 break; 360 361 case 'S': 362 stats++; 363 break; 364 365 case 't': 366 timeout = atoi(optarg); 367 if (maxtimeout < timeout) 368 maxtimeout = timeout; 369 break; 370 371 case 'T': 372 maxtimeout = atoi(optarg); 373 if (timeout > maxtimeout) 374 timeout = maxtimeout; 375 break; 376 377 case 'u': 378 { 379 long val = 0; 380 381 val = strtol(optarg, &optarg, 8); 382 if (*optarg != '\0' || val < 0) 383 syslog(LOG_WARNING, "bad value for -u"); 384 else 385 defumask = val; 386 break; 387 } 388 case 'U': 389 restricted_data_ports = 0; 390 break; 391 392 case 'v': 393 ftpdebug++; 394 break; 395 396 case 'W': 397 dowtmp = 0; 398 break; 399 400 default: 401 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 402 break; 403 } 404 } 405 406 #ifdef VIRTUAL_HOSTING 407 inithosts(); 408 #endif 409 410 if (daemon_mode) { 411 int *ctl_sock, fd, maxfd = -1, nfds, i; 412 fd_set defreadfds, readfds; 413 pid_t pid; 414 415 /* 416 * Detach from parent. 417 */ 418 if (daemon(1, 1) < 0) { 419 syslog(LOG_ERR, "failed to become a daemon"); 420 exit(1); 421 } 422 sa.sa_handler = reapchild; 423 (void)sigaction(SIGCHLD, &sa, NULL); 424 425 /* 426 * Open a socket, bind it to the FTP port, and start 427 * listening. 428 */ 429 ctl_sock = socksetup(family, bindname, bindport); 430 if (ctl_sock == NULL) 431 exit(1); 432 433 FD_ZERO(&defreadfds); 434 for (i = 1; i <= *ctl_sock; i++) { 435 FD_SET(ctl_sock[i], &defreadfds); 436 if (listen(ctl_sock[i], 32) < 0) { 437 syslog(LOG_ERR, "control listen: %m"); 438 exit(1); 439 } 440 if (maxfd < ctl_sock[i]) 441 maxfd = ctl_sock[i]; 442 } 443 444 /* 445 * Atomically write process ID 446 */ 447 if (pid_file) 448 { 449 int fd; 450 char buf[20]; 451 452 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 453 | O_NONBLOCK | O_EXLOCK, 0644); 454 if (fd < 0) { 455 if (errno == EAGAIN) 456 errx(1, "%s: file locked", pid_file); 457 else 458 err(1, "%s", pid_file); 459 } 460 snprintf(buf, sizeof(buf), 461 "%lu\n", (unsigned long) getpid()); 462 if (write(fd, buf, strlen(buf)) < 0) 463 err(1, "%s: write", pid_file); 464 /* Leave the pid file open and locked */ 465 } 466 /* 467 * Loop forever accepting connection requests and forking off 468 * children to handle them. 469 */ 470 while (1) { 471 FD_COPY(&defreadfds, &readfds); 472 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 473 if (nfds <= 0) { 474 if (nfds < 0 && errno != EINTR) 475 syslog(LOG_WARNING, "select: %m"); 476 continue; 477 } 478 479 pid = -1; 480 for (i = 1; i <= *ctl_sock; i++) 481 if (FD_ISSET(ctl_sock[i], &readfds)) { 482 addrlen = sizeof(his_addr); 483 fd = accept(ctl_sock[i], 484 (struct sockaddr *)&his_addr, 485 &addrlen); 486 if (fd >= 0) { 487 if ((pid = fork()) == 0) { 488 /* child */ 489 (void) dup2(fd, 0); 490 (void) dup2(fd, 1); 491 close(ctl_sock[i]); 492 } else 493 close(fd); 494 } 495 } 496 if (pid == 0) 497 break; 498 } 499 } else { 500 addrlen = sizeof(his_addr); 501 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 502 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 503 exit(1); 504 } 505 } 506 507 sa.sa_handler = SIG_DFL; 508 (void)sigaction(SIGCHLD, &sa, NULL); 509 510 sa.sa_handler = sigurg; 511 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 512 (void)sigaction(SIGURG, &sa, NULL); 513 514 sigfillset(&sa.sa_mask); /* block all signals in handler */ 515 sa.sa_flags = SA_RESTART; 516 sa.sa_handler = sigquit; 517 (void)sigaction(SIGHUP, &sa, NULL); 518 (void)sigaction(SIGINT, &sa, NULL); 519 (void)sigaction(SIGQUIT, &sa, NULL); 520 (void)sigaction(SIGTERM, &sa, NULL); 521 522 sa.sa_handler = lostconn; 523 (void)sigaction(SIGPIPE, &sa, NULL); 524 525 addrlen = sizeof(ctrl_addr); 526 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 527 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 528 exit(1); 529 } 530 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 531 #ifdef VIRTUAL_HOSTING 532 /* select our identity from virtual host table */ 533 selecthost(&ctrl_addr); 534 #endif 535 #ifdef IP_TOS 536 if (ctrl_addr.su_family == AF_INET) 537 { 538 tos = IPTOS_LOWDELAY; 539 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 540 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 541 } 542 #endif 543 /* 544 * Disable Nagle on the control channel so that we don't have to wait 545 * for peer's ACK before issuing our next reply. 546 */ 547 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 548 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 549 550 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 551 552 /* set this here so klogin can use it... */ 553 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 554 555 /* Try to handle urgent data inline */ 556 #ifdef SO_OOBINLINE 557 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 558 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 559 #endif 560 561 #ifdef F_SETOWN 562 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 563 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 564 #endif 565 dolog((struct sockaddr *)&his_addr); 566 /* 567 * Set up default state 568 */ 569 data = -1; 570 type = TYPE_A; 571 form = FORM_N; 572 stru = STRU_F; 573 mode = MODE_S; 574 tmpline[0] = '\0'; 575 576 /* If logins are disabled, print out the message. */ 577 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 578 while (fgets(line, sizeof(line), fd) != NULL) { 579 if ((cp = strchr(line, '\n')) != NULL) 580 *cp = '\0'; 581 lreply(530, "%s", line); 582 } 583 (void) fflush(stdout); 584 (void) fclose(fd); 585 reply(530, "System not available."); 586 exit(0); 587 } 588 #ifdef VIRTUAL_HOSTING 589 fd = fopen(thishost->welcome, "r"); 590 #else 591 fd = fopen(_PATH_FTPWELCOME, "r"); 592 #endif 593 if (fd != NULL) { 594 while (fgets(line, sizeof(line), fd) != NULL) { 595 if ((cp = strchr(line, '\n')) != NULL) 596 *cp = '\0'; 597 lreply(220, "%s", line); 598 } 599 (void) fflush(stdout); 600 (void) fclose(fd); 601 /* reply(220,) must follow */ 602 } 603 #ifndef VIRTUAL_HOSTING 604 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 605 fatalerror("Ran out of memory."); 606 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 607 hostname[0] = '\0'; 608 hostname[MAXHOSTNAMELEN - 1] = '\0'; 609 #endif 610 if (hostinfo) 611 reply(220, "%s FTP server (%s) ready.", hostname, version); 612 else 613 reply(220, "FTP server ready."); 614 for (;;) 615 (void) yyparse(); 616 /* NOTREACHED */ 617 } 618 619 static void 620 lostconn(int signo) 621 { 622 623 if (ftpdebug) 624 syslog(LOG_DEBUG, "lost connection"); 625 dologout(1); 626 } 627 628 static void 629 sigquit(int signo) 630 { 631 632 syslog(LOG_ERR, "got signal %d", signo); 633 dologout(1); 634 } 635 636 #ifdef VIRTUAL_HOSTING 637 /* 638 * read in virtual host tables (if they exist) 639 */ 640 641 static void 642 inithosts(void) 643 { 644 int insert; 645 size_t len; 646 FILE *fp; 647 char *cp, *mp, *line; 648 char *hostname; 649 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 650 struct ftphost *hrp, *lhrp; 651 struct addrinfo hints, *res, *ai; 652 653 /* 654 * Fill in the default host information 655 */ 656 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 657 fatalerror("Ran out of memory."); 658 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 659 hostname[0] = '\0'; 660 hostname[MAXHOSTNAMELEN - 1] = '\0'; 661 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 662 fatalerror("Ran out of memory."); 663 hrp->hostname = hostname; 664 hrp->hostinfo = NULL; 665 666 memset(&hints, 0, sizeof(hints)); 667 hints.ai_flags = AI_CANONNAME; 668 hints.ai_family = AF_UNSPEC; 669 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 670 hrp->hostinfo = res; 671 hrp->statfile = _PATH_FTPDSTATFILE; 672 hrp->welcome = _PATH_FTPWELCOME; 673 hrp->loginmsg = _PATH_FTPLOGINMESG; 674 hrp->anonuser = "ftp"; 675 hrp->next = NULL; 676 thishost = firsthost = lhrp = hrp; 677 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 678 int addrsize, gothost; 679 void *addr; 680 struct hostent *hp; 681 682 while ((line = fgetln(fp, &len)) != NULL) { 683 int i, hp_error; 684 685 /* skip comments */ 686 if (line[0] == '#') 687 continue; 688 if (line[len - 1] == '\n') { 689 line[len - 1] = '\0'; 690 mp = NULL; 691 } else { 692 if ((mp = malloc(len + 1)) == NULL) 693 fatalerror("Ran out of memory."); 694 memcpy(mp, line, len); 695 mp[len] = '\0'; 696 line = mp; 697 } 698 cp = strtok(line, " \t"); 699 /* skip empty lines */ 700 if (cp == NULL) 701 goto nextline; 702 vhost = cp; 703 704 /* set defaults */ 705 anonuser = "ftp"; 706 statfile = _PATH_FTPDSTATFILE; 707 welcome = _PATH_FTPWELCOME; 708 loginmsg = _PATH_FTPLOGINMESG; 709 710 /* 711 * Preparse the line so we can use its info 712 * for all the addresses associated with 713 * the virtual host name. 714 * Field 0, the virtual host name, is special: 715 * it's already parsed off and will be strdup'ed 716 * later, after we know its canonical form. 717 */ 718 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 719 if (*cp != '-' && (cp = strdup(cp))) 720 switch (i) { 721 case 1: /* anon user permissions */ 722 anonuser = cp; 723 break; 724 case 2: /* statistics file */ 725 statfile = cp; 726 break; 727 case 3: /* welcome message */ 728 welcome = cp; 729 break; 730 case 4: /* login message */ 731 loginmsg = cp; 732 break; 733 default: /* programming error */ 734 abort(); 735 /* NOTREACHED */ 736 } 737 738 hints.ai_flags = 0; 739 hints.ai_family = AF_UNSPEC; 740 hints.ai_flags = AI_PASSIVE; 741 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 742 goto nextline; 743 for (ai = res; ai != NULL && ai->ai_addr != NULL; 744 ai = ai->ai_next) { 745 746 gothost = 0; 747 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 748 struct addrinfo *hi; 749 750 for (hi = hrp->hostinfo; hi != NULL; 751 hi = hi->ai_next) 752 if (hi->ai_addrlen == ai->ai_addrlen && 753 memcmp(hi->ai_addr, 754 ai->ai_addr, 755 ai->ai_addr->sa_len) == 0) { 756 gothost++; 757 break; 758 } 759 if (gothost) 760 break; 761 } 762 if (hrp == NULL) { 763 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 764 goto nextline; 765 hrp->hostname = NULL; 766 insert = 1; 767 } else { 768 if (hrp->hostinfo && hrp->hostinfo != res) 769 freeaddrinfo(hrp->hostinfo); 770 insert = 0; /* host already in the chain */ 771 } 772 hrp->hostinfo = res; 773 774 /* 775 * determine hostname to use. 776 * force defined name if there is a valid alias 777 * otherwise fallback to primary hostname 778 */ 779 /* XXX: getaddrinfo() can't do alias check */ 780 switch(hrp->hostinfo->ai_family) { 781 case AF_INET: 782 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 783 addrsize = sizeof(struct in_addr); 784 break; 785 case AF_INET6: 786 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 787 addrsize = sizeof(struct in6_addr); 788 break; 789 default: 790 /* should not reach here */ 791 freeaddrinfo(hrp->hostinfo); 792 if (insert) 793 free(hrp); /*not in chain, can free*/ 794 else 795 hrp->hostinfo = NULL; /*mark as blank*/ 796 goto nextline; 797 /* NOTREACHED */ 798 } 799 if ((hp = getipnodebyaddr(addr, addrsize, 800 hrp->hostinfo->ai_family, 801 &hp_error)) != NULL) { 802 if (strcmp(vhost, hp->h_name) != 0) { 803 if (hp->h_aliases == NULL) 804 vhost = hp->h_name; 805 else { 806 i = 0; 807 while (hp->h_aliases[i] && 808 strcmp(vhost, hp->h_aliases[i]) != 0) 809 ++i; 810 if (hp->h_aliases[i] == NULL) 811 vhost = hp->h_name; 812 } 813 } 814 } 815 if (hrp->hostname && 816 strcmp(hrp->hostname, vhost) != 0) { 817 free(hrp->hostname); 818 hrp->hostname = NULL; 819 } 820 if (hrp->hostname == NULL && 821 (hrp->hostname = strdup(vhost)) == NULL) { 822 freeaddrinfo(hrp->hostinfo); 823 hrp->hostinfo = NULL; /* mark as blank */ 824 if (hp) 825 freehostent(hp); 826 goto nextline; 827 } 828 hrp->anonuser = anonuser; 829 hrp->statfile = statfile; 830 hrp->welcome = welcome; 831 hrp->loginmsg = loginmsg; 832 if (insert) { 833 hrp->next = NULL; 834 lhrp->next = hrp; 835 lhrp = hrp; 836 } 837 if (hp) 838 freehostent(hp); 839 } 840 nextline: 841 if (mp) 842 free(mp); 843 } 844 (void) fclose(fp); 845 } 846 } 847 848 static void 849 selecthost(union sockunion *su) 850 { 851 struct ftphost *hrp; 852 u_int16_t port; 853 #ifdef INET6 854 struct in6_addr *mapped_in6 = NULL; 855 #endif 856 struct addrinfo *hi; 857 858 #ifdef INET6 859 /* 860 * XXX IPv4 mapped IPv6 addr consideraton, 861 * specified in rfc2373. 862 */ 863 if (su->su_family == AF_INET6 && 864 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 865 mapped_in6 = &su->su_sin6.sin6_addr; 866 #endif 867 868 hrp = thishost = firsthost; /* default */ 869 port = su->su_port; 870 su->su_port = 0; 871 while (hrp != NULL) { 872 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 873 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 874 thishost = hrp; 875 goto found; 876 } 877 #ifdef INET6 878 /* XXX IPv4 mapped IPv6 addr consideraton */ 879 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 880 (memcmp(&mapped_in6->s6_addr[12], 881 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 882 sizeof(struct in_addr)) == 0)) { 883 thishost = hrp; 884 goto found; 885 } 886 #endif 887 } 888 hrp = hrp->next; 889 } 890 found: 891 su->su_port = port; 892 /* setup static variables as appropriate */ 893 hostname = thishost->hostname; 894 ftpuser = thishost->anonuser; 895 } 896 #endif 897 898 /* 899 * Helper function for sgetpwnam(). 900 */ 901 static char * 902 sgetsave(char *s) 903 { 904 char *new = malloc(strlen(s) + 1); 905 906 if (new == NULL) { 907 reply(421, "Ran out of memory."); 908 dologout(1); 909 /* NOTREACHED */ 910 } 911 (void) strcpy(new, s); 912 return (new); 913 } 914 915 /* 916 * Save the result of a getpwnam. Used for USER command, since 917 * the data returned must not be clobbered by any other command 918 * (e.g., globbing). 919 * NB: The data returned by sgetpwnam() will remain valid until 920 * the next call to this function. Its difference from getpwnam() 921 * is that sgetpwnam() is known to be called from ftpd code only. 922 */ 923 static struct passwd * 924 sgetpwnam(char *name) 925 { 926 static struct passwd save; 927 struct passwd *p; 928 929 if ((p = getpwnam(name)) == NULL) 930 return (p); 931 if (save.pw_name) { 932 free(save.pw_name); 933 free(save.pw_passwd); 934 free(save.pw_gecos); 935 free(save.pw_dir); 936 free(save.pw_shell); 937 } 938 save = *p; 939 save.pw_name = sgetsave(p->pw_name); 940 save.pw_passwd = sgetsave(p->pw_passwd); 941 save.pw_gecos = sgetsave(p->pw_gecos); 942 save.pw_dir = sgetsave(p->pw_dir); 943 save.pw_shell = sgetsave(p->pw_shell); 944 return (&save); 945 } 946 947 static int login_attempts; /* number of failed login attempts */ 948 static int askpasswd; /* had user command, ask for passwd */ 949 static char curname[MAXLOGNAME]; /* current USER name */ 950 951 /* 952 * USER command. 953 * Sets global passwd pointer pw if named account exists and is acceptable; 954 * sets askpasswd if a PASS command is expected. If logged in previously, 955 * need to reset state. If name is "ftp" or "anonymous", the name is not in 956 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 957 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 958 * requesting login privileges. Disallow anyone who does not have a standard 959 * shell as returned by getusershell(). Disallow anyone mentioned in the file 960 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 961 */ 962 void 963 user(char *name) 964 { 965 char *cp, *shell; 966 967 if (logged_in) { 968 if (guest) { 969 reply(530, "Can't change user from guest login."); 970 return; 971 } else if (dochroot) { 972 reply(530, "Can't change user from chroot user."); 973 return; 974 } 975 end_login(); 976 } 977 978 guest = 0; 979 #ifdef VIRTUAL_HOSTING 980 pw = sgetpwnam(thishost->anonuser); 981 #else 982 pw = sgetpwnam("ftp"); 983 #endif 984 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 985 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 986 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 987 reply(530, "User %s access denied.", name); 988 else if (pw != NULL) { 989 guest = 1; 990 askpasswd = 1; 991 reply(331, 992 "Guest login ok, send your email address as password."); 993 } else 994 reply(530, "User %s unknown.", name); 995 if (!askpasswd && logging) 996 syslog(LOG_NOTICE, 997 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 998 return; 999 } 1000 if (anon_only != 0) { 1001 reply(530, "Sorry, only anonymous ftp allowed."); 1002 return; 1003 } 1004 1005 if ((pw = sgetpwnam(name))) { 1006 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1007 shell = _PATH_BSHELL; 1008 setusershell(); 1009 while ((cp = getusershell()) != NULL) 1010 if (strcmp(cp, shell) == 0) 1011 break; 1012 endusershell(); 1013 1014 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1015 reply(530, "User %s access denied.", name); 1016 if (logging) 1017 syslog(LOG_NOTICE, 1018 "FTP LOGIN REFUSED FROM %s, %s", 1019 remotehost, name); 1020 pw = NULL; 1021 return; 1022 } 1023 } 1024 if (logging) 1025 strncpy(curname, name, sizeof(curname)-1); 1026 1027 pwok = 0; 1028 #ifdef USE_PAM 1029 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1030 #endif 1031 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1032 pwok = (pw != NULL) && 1033 opieaccessfile(remotehost) && 1034 opiealways(pw->pw_dir); 1035 reply(331, "Response to %s %s for %s.", 1036 opieprompt, pwok ? "requested" : "required", name); 1037 } else { 1038 pwok = 1; 1039 reply(331, "Password required for %s.", name); 1040 } 1041 askpasswd = 1; 1042 /* 1043 * Delay before reading passwd after first failed 1044 * attempt to slow down passwd-guessing programs. 1045 */ 1046 if (login_attempts) 1047 sleep(login_attempts); 1048 } 1049 1050 /* 1051 * Check if a user is in the file "fname", 1052 * return a pointer to a malloc'd string with the rest 1053 * of the matching line in "residue" if not NULL. 1054 */ 1055 static int 1056 checkuser(char *fname, char *name, int pwset, char **residue) 1057 { 1058 FILE *fd; 1059 int found = 0; 1060 size_t len; 1061 char *line, *mp, *p; 1062 1063 if ((fd = fopen(fname, "r")) != NULL) { 1064 while (!found && (line = fgetln(fd, &len)) != NULL) { 1065 /* skip comments */ 1066 if (line[0] == '#') 1067 continue; 1068 if (line[len - 1] == '\n') { 1069 line[len - 1] = '\0'; 1070 mp = NULL; 1071 } else { 1072 if ((mp = malloc(len + 1)) == NULL) 1073 fatalerror("Ran out of memory."); 1074 memcpy(mp, line, len); 1075 mp[len] = '\0'; 1076 line = mp; 1077 } 1078 /* avoid possible leading and trailing whitespace */ 1079 p = strtok(line, " \t"); 1080 /* skip empty lines */ 1081 if (p == NULL) 1082 goto nextline; 1083 /* 1084 * if first chr is '@', check group membership 1085 */ 1086 if (p[0] == '@') { 1087 int i = 0; 1088 struct group *grp; 1089 1090 if (p[1] == '\0') /* single @ matches anyone */ 1091 found = 1; 1092 else { 1093 if ((grp = getgrnam(p+1)) == NULL) 1094 goto nextline; 1095 /* 1096 * Check user's default group 1097 */ 1098 if (pwset && grp->gr_gid == pw->pw_gid) 1099 found = 1; 1100 /* 1101 * Check supplementary groups 1102 */ 1103 while (!found && grp->gr_mem[i]) 1104 found = strcmp(name, 1105 grp->gr_mem[i++]) 1106 == 0; 1107 } 1108 } 1109 /* 1110 * Otherwise, just check for username match 1111 */ 1112 else 1113 found = strcmp(p, name) == 0; 1114 /* 1115 * Save the rest of line to "residue" if matched 1116 */ 1117 if (found && residue) { 1118 if ((p = strtok(NULL, "")) != NULL) 1119 p += strspn(p, " \t"); 1120 if (p && *p) { 1121 if ((*residue = strdup(p)) == NULL) 1122 fatalerror("Ran out of memory."); 1123 } else 1124 *residue = NULL; 1125 } 1126 nextline: 1127 if (mp) 1128 free(mp); 1129 } 1130 (void) fclose(fd); 1131 } 1132 return (found); 1133 } 1134 1135 /* 1136 * Terminate login as previous user, if any, resetting state; 1137 * used when USER command is given or login fails. 1138 */ 1139 static void 1140 end_login(void) 1141 { 1142 #ifdef USE_PAM 1143 int e; 1144 #endif 1145 1146 (void) seteuid(0); 1147 if (logged_in && dowtmp) 1148 ftpd_logwtmp(ttyline, "", NULL); 1149 pw = NULL; 1150 #ifdef LOGIN_CAP 1151 setusercontext(NULL, getpwuid(0), 0, 1152 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1153 LOGIN_SETMAC); 1154 #endif 1155 #ifdef USE_PAM 1156 if (pamh) { 1157 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1158 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1159 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1160 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1161 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1162 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1163 pamh = NULL; 1164 } 1165 #endif 1166 logged_in = 0; 1167 guest = 0; 1168 dochroot = 0; 1169 } 1170 1171 #ifdef USE_PAM 1172 1173 /* 1174 * the following code is stolen from imap-uw PAM authentication module and 1175 * login.c 1176 */ 1177 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1178 1179 struct cred_t { 1180 const char *uname; /* user name */ 1181 const char *pass; /* password */ 1182 }; 1183 typedef struct cred_t cred_t; 1184 1185 static int 1186 auth_conv(int num_msg, const struct pam_message **msg, 1187 struct pam_response **resp, void *appdata) 1188 { 1189 int i; 1190 cred_t *cred = (cred_t *) appdata; 1191 struct pam_response *reply; 1192 1193 reply = calloc(num_msg, sizeof *reply); 1194 if (reply == NULL) 1195 return PAM_BUF_ERR; 1196 1197 for (i = 0; i < num_msg; i++) { 1198 switch (msg[i]->msg_style) { 1199 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1200 reply[i].resp_retcode = PAM_SUCCESS; 1201 reply[i].resp = COPY_STRING(cred->uname); 1202 /* PAM frees resp. */ 1203 break; 1204 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1205 reply[i].resp_retcode = PAM_SUCCESS; 1206 reply[i].resp = COPY_STRING(cred->pass); 1207 /* PAM frees resp. */ 1208 break; 1209 case PAM_TEXT_INFO: 1210 case PAM_ERROR_MSG: 1211 reply[i].resp_retcode = PAM_SUCCESS; 1212 reply[i].resp = NULL; 1213 break; 1214 default: /* unknown message style */ 1215 free(reply); 1216 return PAM_CONV_ERR; 1217 } 1218 } 1219 1220 *resp = reply; 1221 return PAM_SUCCESS; 1222 } 1223 1224 /* 1225 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1226 * authenticated, or 1 if not authenticated. If some sort of PAM system 1227 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1228 * function returns -1. This can be used as an indication that we should 1229 * fall back to a different authentication mechanism. 1230 */ 1231 static int 1232 auth_pam(struct passwd **ppw, const char *pass) 1233 { 1234 const char *tmpl_user; 1235 const void *item; 1236 int rval; 1237 int e; 1238 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1239 struct pam_conv conv = { &auth_conv, &auth_cred }; 1240 1241 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1242 if (e != PAM_SUCCESS) { 1243 /* 1244 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1245 * if context creation has failed in the first place. 1246 */ 1247 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1248 return -1; 1249 } 1250 1251 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1252 if (e != PAM_SUCCESS) { 1253 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1254 pam_strerror(pamh, e)); 1255 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1256 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1257 } 1258 pamh = NULL; 1259 return -1; 1260 } 1261 1262 e = pam_authenticate(pamh, 0); 1263 switch (e) { 1264 case PAM_SUCCESS: 1265 /* 1266 * With PAM we support the concept of a "template" 1267 * user. The user enters a login name which is 1268 * authenticated by PAM, usually via a remote service 1269 * such as RADIUS or TACACS+. If authentication 1270 * succeeds, a different but related "template" name 1271 * is used for setting the credentials, shell, and 1272 * home directory. The name the user enters need only 1273 * exist on the remote authentication server, but the 1274 * template name must be present in the local password 1275 * database. 1276 * 1277 * This is supported by two various mechanisms in the 1278 * individual modules. However, from the application's 1279 * point of view, the template user is always passed 1280 * back as a changed value of the PAM_USER item. 1281 */ 1282 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1283 PAM_SUCCESS) { 1284 tmpl_user = (const char *) item; 1285 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1286 *ppw = getpwnam(tmpl_user); 1287 } else 1288 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1289 pam_strerror(pamh, e)); 1290 rval = 0; 1291 break; 1292 1293 case PAM_AUTH_ERR: 1294 case PAM_USER_UNKNOWN: 1295 case PAM_MAXTRIES: 1296 rval = 1; 1297 break; 1298 1299 default: 1300 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1301 rval = -1; 1302 break; 1303 } 1304 1305 if (rval == 0) { 1306 e = pam_acct_mgmt(pamh, 0); 1307 if (e != PAM_SUCCESS) { 1308 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1309 pam_strerror(pamh, e)); 1310 rval = 1; 1311 } 1312 } 1313 1314 if (rval != 0) { 1315 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1316 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1317 } 1318 pamh = NULL; 1319 } 1320 return rval; 1321 } 1322 1323 #endif /* USE_PAM */ 1324 1325 void 1326 pass(char *passwd) 1327 { 1328 int rval; 1329 FILE *fd; 1330 #ifdef LOGIN_CAP 1331 login_cap_t *lc = NULL; 1332 #endif 1333 #ifdef USE_PAM 1334 int e; 1335 #endif 1336 char *residue = NULL; 1337 char *xpasswd; 1338 1339 if (logged_in || askpasswd == 0) { 1340 reply(503, "Login with USER first."); 1341 return; 1342 } 1343 askpasswd = 0; 1344 if (!guest) { /* "ftp" is only account allowed no password */ 1345 if (pw == NULL) { 1346 rval = 1; /* failure below */ 1347 goto skip; 1348 } 1349 #ifdef USE_PAM 1350 rval = auth_pam(&pw, passwd); 1351 if (rval >= 0) { 1352 opieunlock(); 1353 goto skip; 1354 } 1355 #endif 1356 if (opieverify(&opiedata, passwd) == 0) 1357 xpasswd = pw->pw_passwd; 1358 else if (pwok) { 1359 xpasswd = crypt(passwd, pw->pw_passwd); 1360 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1361 xpasswd = ":"; 1362 } else { 1363 rval = 1; 1364 goto skip; 1365 } 1366 rval = strcmp(pw->pw_passwd, xpasswd); 1367 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1368 rval = 1; /* failure */ 1369 skip: 1370 /* 1371 * If rval == 1, the user failed the authentication check 1372 * above. If rval == 0, either PAM or local authentication 1373 * succeeded. 1374 */ 1375 if (rval) { 1376 reply(530, "Login incorrect."); 1377 if (logging) { 1378 syslog(LOG_NOTICE, 1379 "FTP LOGIN FAILED FROM %s", 1380 remotehost); 1381 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1382 "FTP LOGIN FAILED FROM %s, %s", 1383 remotehost, curname); 1384 } 1385 pw = NULL; 1386 if (login_attempts++ >= 5) { 1387 syslog(LOG_NOTICE, 1388 "repeated login failures from %s", 1389 remotehost); 1390 exit(0); 1391 } 1392 return; 1393 } 1394 } 1395 login_attempts = 0; /* this time successful */ 1396 if (setegid(pw->pw_gid) < 0) { 1397 reply(550, "Can't set gid."); 1398 return; 1399 } 1400 /* May be overridden by login.conf */ 1401 (void) umask(defumask); 1402 #ifdef LOGIN_CAP 1403 if ((lc = login_getpwclass(pw)) != NULL) { 1404 char remote_ip[NI_MAXHOST]; 1405 1406 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1407 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1408 NI_NUMERICHOST)) 1409 *remote_ip = 0; 1410 remote_ip[sizeof(remote_ip) - 1] = 0; 1411 if (!auth_hostok(lc, remotehost, remote_ip)) { 1412 syslog(LOG_INFO|LOG_AUTH, 1413 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1414 pw->pw_name); 1415 reply(530, "Permission denied."); 1416 pw = NULL; 1417 return; 1418 } 1419 if (!auth_timeok(lc, time(NULL))) { 1420 reply(530, "Login not available right now."); 1421 pw = NULL; 1422 return; 1423 } 1424 } 1425 setusercontext(lc, pw, 0, 1426 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1427 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1428 #else 1429 setlogin(pw->pw_name); 1430 (void) initgroups(pw->pw_name, pw->pw_gid); 1431 #endif 1432 1433 #ifdef USE_PAM 1434 if (pamh) { 1435 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1436 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1437 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1438 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1439 } 1440 } 1441 #endif 1442 1443 /* open wtmp before chroot */ 1444 if (dowtmp) 1445 ftpd_logwtmp(ttyline, pw->pw_name, 1446 (struct sockaddr *)&his_addr); 1447 logged_in = 1; 1448 1449 if (guest && stats && statfd < 0) 1450 #ifdef VIRTUAL_HOSTING 1451 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1452 #else 1453 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1454 #endif 1455 if (statfd < 0) 1456 stats = 0; 1457 1458 dochroot = 1459 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1460 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1461 || login_getcapbool(lc, "ftp-chroot", 0) 1462 #endif 1463 ; 1464 chrootdir = NULL; 1465 /* 1466 * For a chrooted local user, 1467 * a) see whether ftpchroot(5) specifies a chroot directory, 1468 * b) extract the directory pathname from the line, 1469 * c) expand it to the absolute pathname if necessary. 1470 */ 1471 if (dochroot && residue && 1472 (chrootdir = strtok(residue, " \t")) != NULL) { 1473 if (chrootdir[0] != '/') 1474 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1475 else 1476 chrootdir = strdup(chrootdir); /* make it permanent */ 1477 if (chrootdir == NULL) 1478 fatalerror("Ran out of memory."); 1479 } 1480 if (guest || dochroot) { 1481 /* 1482 * If no chroot directory set yet, use the login directory. 1483 * Copy it so it can be modified while pw->pw_dir stays intact. 1484 */ 1485 if (chrootdir == NULL && 1486 (chrootdir = strdup(pw->pw_dir)) == NULL) 1487 fatalerror("Ran out of memory."); 1488 /* 1489 * Check for the "/chroot/./home" syntax, 1490 * separate the chroot and home directory pathnames. 1491 */ 1492 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1493 *(homedir++) = '\0'; /* wipe '/' */ 1494 homedir++; /* skip '.' */ 1495 } else { 1496 /* 1497 * We MUST do a chdir() after the chroot. Otherwise 1498 * the old current directory will be accessible as "." 1499 * outside the new root! 1500 */ 1501 homedir = "/"; 1502 } 1503 /* 1504 * Finally, do chroot() 1505 */ 1506 if (chroot(chrootdir) < 0) { 1507 reply(550, "Can't change root."); 1508 goto bad; 1509 } 1510 } else /* real user w/o chroot */ 1511 homedir = pw->pw_dir; 1512 /* 1513 * Set euid *before* doing chdir() so 1514 * a) the user won't be carried to a directory that he couldn't reach 1515 * on his own due to no permission to upper path components, 1516 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1517 * (uid 0 has no root power over NFS if not mapped explicitly.) 1518 */ 1519 if (seteuid(pw->pw_uid) < 0) { 1520 reply(550, "Can't set uid."); 1521 goto bad; 1522 } 1523 if (chdir(homedir) < 0) { 1524 if (guest || dochroot) { 1525 reply(550, "Can't change to base directory."); 1526 goto bad; 1527 } else { 1528 if (chdir("/") < 0) { 1529 reply(550, "Root is inaccessible."); 1530 goto bad; 1531 } 1532 lreply(230, "No directory! Logging in with home=/."); 1533 } 1534 } 1535 1536 /* 1537 * Display a login message, if it exists. 1538 * N.B. reply(230,) must follow the message. 1539 */ 1540 #ifdef VIRTUAL_HOSTING 1541 fd = fopen(thishost->loginmsg, "r"); 1542 #else 1543 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1544 #endif 1545 if (fd != NULL) { 1546 char *cp, line[LINE_MAX]; 1547 1548 while (fgets(line, sizeof(line), fd) != NULL) { 1549 if ((cp = strchr(line, '\n')) != NULL) 1550 *cp = '\0'; 1551 lreply(230, "%s", line); 1552 } 1553 (void) fflush(stdout); 1554 (void) fclose(fd); 1555 } 1556 if (guest) { 1557 if (ident != NULL) 1558 free(ident); 1559 ident = strdup(passwd); 1560 if (ident == NULL) 1561 fatalerror("Ran out of memory."); 1562 1563 reply(230, "Guest login ok, access restrictions apply."); 1564 #ifdef SETPROCTITLE 1565 #ifdef VIRTUAL_HOSTING 1566 if (thishost != firsthost) 1567 snprintf(proctitle, sizeof(proctitle), 1568 "%s: anonymous(%s)/%s", remotehost, hostname, 1569 passwd); 1570 else 1571 #endif 1572 snprintf(proctitle, sizeof(proctitle), 1573 "%s: anonymous/%s", remotehost, passwd); 1574 setproctitle("%s", proctitle); 1575 #endif /* SETPROCTITLE */ 1576 if (logging) 1577 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1578 remotehost, passwd); 1579 } else { 1580 if (dochroot) 1581 reply(230, "User %s logged in, " 1582 "access restrictions apply.", pw->pw_name); 1583 else 1584 reply(230, "User %s logged in.", pw->pw_name); 1585 1586 #ifdef SETPROCTITLE 1587 snprintf(proctitle, sizeof(proctitle), 1588 "%s: user/%s", remotehost, pw->pw_name); 1589 setproctitle("%s", proctitle); 1590 #endif /* SETPROCTITLE */ 1591 if (logging) 1592 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1593 remotehost, pw->pw_name); 1594 } 1595 if (guest || dochroot) 1596 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1597 #ifdef LOGIN_CAP 1598 login_close(lc); 1599 #endif 1600 if (residue) 1601 free(residue); 1602 return; 1603 bad: 1604 /* Forget all about it... */ 1605 #ifdef LOGIN_CAP 1606 login_close(lc); 1607 #endif 1608 if (residue) 1609 free(residue); 1610 end_login(); 1611 } 1612 1613 void 1614 retrieve(char *cmd, char *name) 1615 { 1616 FILE *fin, *dout; 1617 struct stat st; 1618 int (*closefunc)(FILE *); 1619 time_t start; 1620 1621 if (cmd == 0) { 1622 fin = fopen(name, "r"), closefunc = fclose; 1623 st.st_size = 0; 1624 } else { 1625 char line[BUFSIZ]; 1626 1627 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1628 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1629 st.st_size = -1; 1630 st.st_blksize = BUFSIZ; 1631 } 1632 if (fin == NULL) { 1633 if (errno != 0) { 1634 perror_reply(550, name); 1635 if (cmd == 0) { 1636 LOGCMD("get", name); 1637 } 1638 } 1639 return; 1640 } 1641 byte_count = -1; 1642 if (cmd == 0) { 1643 if (fstat(fileno(fin), &st) < 0) { 1644 perror_reply(550, name); 1645 goto done; 1646 } 1647 if (!S_ISREG(st.st_mode)) { 1648 /* 1649 * Never sending a raw directory is a workaround 1650 * for buggy clients that will attempt to RETR 1651 * a directory before listing it, e.g., Mozilla. 1652 * Preventing a guest from getting irregular files 1653 * is a simple security measure. 1654 */ 1655 if (S_ISDIR(st.st_mode) || guest) { 1656 reply(550, "%s: not a plain file.", name); 1657 goto done; 1658 } 1659 st.st_size = -1; 1660 /* st.st_blksize is set for all descriptor types */ 1661 } 1662 } 1663 if (restart_point) { 1664 if (type == TYPE_A) { 1665 off_t i, n; 1666 int c; 1667 1668 n = restart_point; 1669 i = 0; 1670 while (i++ < n) { 1671 if ((c=getc(fin)) == EOF) { 1672 perror_reply(550, name); 1673 goto done; 1674 } 1675 if (c == '\n') 1676 i++; 1677 } 1678 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1679 perror_reply(550, name); 1680 goto done; 1681 } 1682 } 1683 dout = dataconn(name, st.st_size, "w"); 1684 if (dout == NULL) 1685 goto done; 1686 time(&start); 1687 send_data(fin, dout, st.st_blksize, st.st_size, 1688 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1689 if (cmd == 0 && guest && stats && byte_count > 0) 1690 logxfer(name, byte_count, start); 1691 (void) fclose(dout); 1692 data = -1; 1693 pdata = -1; 1694 done: 1695 if (cmd == 0) 1696 LOGBYTES("get", name, byte_count); 1697 (*closefunc)(fin); 1698 } 1699 1700 void 1701 store(char *name, char *mode, int unique) 1702 { 1703 int fd; 1704 FILE *fout, *din; 1705 int (*closefunc)(FILE *); 1706 1707 if (*mode == 'a') { /* APPE */ 1708 if (unique) { 1709 /* Programming error */ 1710 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1711 unique = 0; 1712 } 1713 if (guest && noguestmod) { 1714 reply(550, "Appending to existing file denied."); 1715 goto err; 1716 } 1717 restart_point = 0; /* not affected by preceding REST */ 1718 } 1719 if (unique) /* STOU overrides REST */ 1720 restart_point = 0; 1721 if (guest && noguestmod) { 1722 if (restart_point) { /* guest STOR w/REST */ 1723 reply(550, "Modifying existing file denied."); 1724 goto err; 1725 } else /* treat guest STOR as STOU */ 1726 unique = 1; 1727 } 1728 1729 if (restart_point) 1730 mode = "r+"; /* so ASCII manual seek can work */ 1731 if (unique) { 1732 if ((fd = guniquefd(name, &name)) < 0) 1733 goto err; 1734 fout = fdopen(fd, mode); 1735 } else 1736 fout = fopen(name, mode); 1737 closefunc = fclose; 1738 if (fout == NULL) { 1739 perror_reply(553, name); 1740 goto err; 1741 } 1742 byte_count = -1; 1743 if (restart_point) { 1744 if (type == TYPE_A) { 1745 off_t i, n; 1746 int c; 1747 1748 n = restart_point; 1749 i = 0; 1750 while (i++ < n) { 1751 if ((c=getc(fout)) == EOF) { 1752 perror_reply(550, name); 1753 goto done; 1754 } 1755 if (c == '\n') 1756 i++; 1757 } 1758 /* 1759 * We must do this seek to "current" position 1760 * because we are changing from reading to 1761 * writing. 1762 */ 1763 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1764 perror_reply(550, name); 1765 goto done; 1766 } 1767 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1768 perror_reply(550, name); 1769 goto done; 1770 } 1771 } 1772 din = dataconn(name, -1, "r"); 1773 if (din == NULL) 1774 goto done; 1775 if (receive_data(din, fout) == 0) { 1776 if (unique) 1777 reply(226, "Transfer complete (unique file name:%s).", 1778 name); 1779 else 1780 reply(226, "Transfer complete."); 1781 } 1782 (void) fclose(din); 1783 data = -1; 1784 pdata = -1; 1785 done: 1786 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1787 (*closefunc)(fout); 1788 return; 1789 err: 1790 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1791 return; 1792 } 1793 1794 static FILE * 1795 getdatasock(char *mode) 1796 { 1797 int on = 1, s, t, tries; 1798 1799 if (data >= 0) 1800 return (fdopen(data, mode)); 1801 1802 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1803 if (s < 0) 1804 goto bad; 1805 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1806 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1807 /* anchor socket to avoid multi-homing problems */ 1808 data_source = ctrl_addr; 1809 data_source.su_port = htons(dataport); 1810 (void) seteuid(0); 1811 for (tries = 1; ; tries++) { 1812 /* 1813 * We should loop here since it's possible that 1814 * another ftpd instance has passed this point and is 1815 * trying to open a data connection in active mode now. 1816 * Until the other connection is opened, we'll be getting 1817 * EADDRINUSE because no SOCK_STREAM sockets in the system 1818 * can share both local and remote addresses, localIP:20 1819 * and *:* in this case. 1820 */ 1821 if (bind(s, (struct sockaddr *)&data_source, 1822 data_source.su_len) >= 0) 1823 break; 1824 if (errno != EADDRINUSE || tries > 10) 1825 goto bad; 1826 sleep(tries); 1827 } 1828 (void) seteuid(pw->pw_uid); 1829 #ifdef IP_TOS 1830 if (data_source.su_family == AF_INET) 1831 { 1832 on = IPTOS_THROUGHPUT; 1833 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1834 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1835 } 1836 #endif 1837 #ifdef TCP_NOPUSH 1838 /* 1839 * Turn off push flag to keep sender TCP from sending short packets 1840 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1841 * to set the send buffer size as well, but that may not be desirable 1842 * in heavy-load situations. 1843 */ 1844 on = 1; 1845 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1846 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1847 #endif 1848 #ifdef SO_SNDBUF 1849 on = 65536; 1850 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1851 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1852 #endif 1853 1854 return (fdopen(s, mode)); 1855 bad: 1856 /* Return the real value of errno (close may change it) */ 1857 t = errno; 1858 (void) seteuid(pw->pw_uid); 1859 (void) close(s); 1860 errno = t; 1861 return (NULL); 1862 } 1863 1864 static FILE * 1865 dataconn(char *name, off_t size, char *mode) 1866 { 1867 char sizebuf[32]; 1868 FILE *file; 1869 int retry = 0, tos, conerrno; 1870 1871 file_size = size; 1872 byte_count = 0; 1873 if (size != -1) 1874 (void) snprintf(sizebuf, sizeof(sizebuf), 1875 " (%jd bytes)", (intmax_t)size); 1876 else 1877 *sizebuf = '\0'; 1878 if (pdata >= 0) { 1879 union sockunion from; 1880 int flags; 1881 int s, fromlen = ctrl_addr.su_len; 1882 struct timeval timeout; 1883 fd_set set; 1884 1885 FD_ZERO(&set); 1886 FD_SET(pdata, &set); 1887 1888 timeout.tv_usec = 0; 1889 timeout.tv_sec = 120; 1890 1891 /* 1892 * Granted a socket is in the blocking I/O mode, 1893 * accept() will block after a successful select() 1894 * if the selected connection dies in between. 1895 * Therefore set the non-blocking I/O flag here. 1896 */ 1897 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1898 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1899 goto pdata_err; 1900 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1901 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1902 goto pdata_err; 1903 (void) close(pdata); 1904 pdata = s; 1905 /* 1906 * Unset the inherited non-blocking I/O flag 1907 * on the child socket so stdio can work on it. 1908 */ 1909 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1910 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1911 goto pdata_err; 1912 #ifdef IP_TOS 1913 if (from.su_family == AF_INET) 1914 { 1915 tos = IPTOS_THROUGHPUT; 1916 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1917 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1918 } 1919 #endif 1920 reply(150, "Opening %s mode data connection for '%s'%s.", 1921 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1922 return (fdopen(pdata, mode)); 1923 pdata_err: 1924 reply(425, "Can't open data connection."); 1925 (void) close(pdata); 1926 pdata = -1; 1927 return (NULL); 1928 } 1929 if (data >= 0) { 1930 reply(125, "Using existing data connection for '%s'%s.", 1931 name, sizebuf); 1932 usedefault = 1; 1933 return (fdopen(data, mode)); 1934 } 1935 if (usedefault) 1936 data_dest = his_addr; 1937 usedefault = 1; 1938 do { 1939 file = getdatasock(mode); 1940 if (file == NULL) { 1941 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1942 1943 if (getnameinfo((struct sockaddr *)&data_source, 1944 data_source.su_len, 1945 hostbuf, sizeof(hostbuf) - 1, 1946 portbuf, sizeof(portbuf) - 1, 1947 NI_NUMERICHOST|NI_NUMERICSERV)) 1948 *hostbuf = *portbuf = 0; 1949 hostbuf[sizeof(hostbuf) - 1] = 0; 1950 portbuf[sizeof(portbuf) - 1] = 0; 1951 reply(425, "Can't create data socket (%s,%s): %s.", 1952 hostbuf, portbuf, strerror(errno)); 1953 return (NULL); 1954 } 1955 data = fileno(file); 1956 conerrno = 0; 1957 if (connect(data, (struct sockaddr *)&data_dest, 1958 data_dest.su_len) == 0) 1959 break; 1960 conerrno = errno; 1961 (void) fclose(file); 1962 data = -1; 1963 if (conerrno == EADDRINUSE) { 1964 sleep(swaitint); 1965 retry += swaitint; 1966 } else { 1967 break; 1968 } 1969 } while (retry <= swaitmax); 1970 if (conerrno != 0) { 1971 reply(425, "Can't build data connection: %s.", 1972 strerror(conerrno)); 1973 return (NULL); 1974 } 1975 reply(150, "Opening %s mode data connection for '%s'%s.", 1976 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1977 return (file); 1978 } 1979 1980 /* 1981 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1982 * encapsulation of the data subject to Mode, Structure, and Type. 1983 * 1984 * NB: Form isn't handled. 1985 */ 1986 static int 1987 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 1988 { 1989 int c, cp, filefd, netfd; 1990 char *buf; 1991 off_t cnt; 1992 1993 transflag++; 1994 switch (type) { 1995 1996 case TYPE_A: 1997 cp = '\0'; 1998 while ((c = getc(instr)) != EOF) { 1999 if (recvurg) 2000 goto got_oob; 2001 byte_count++; 2002 if (c == '\n' && cp != '\r') { 2003 if (ferror(outstr)) 2004 goto data_err; 2005 (void) putc('\r', outstr); 2006 } 2007 (void) putc(c, outstr); 2008 cp = c; 2009 } 2010 if (recvurg) 2011 goto got_oob; 2012 fflush(outstr); 2013 transflag = 0; 2014 if (ferror(instr)) 2015 goto file_err; 2016 if (ferror(outstr)) 2017 goto data_err; 2018 reply(226, "Transfer complete."); 2019 return (0); 2020 2021 case TYPE_I: 2022 case TYPE_L: 2023 /* 2024 * isreg is only set if we are not doing restart and we 2025 * are sending a regular file 2026 */ 2027 netfd = fileno(outstr); 2028 filefd = fileno(instr); 2029 2030 if (isreg) { 2031 char *msg = "Transfer complete."; 2032 off_t offset; 2033 int err; 2034 2035 cnt = offset = 0; 2036 2037 while (filesize > 0) { 2038 err = sendfile(filefd, netfd, offset, 0, 2039 NULL, &cnt, 0); 2040 /* 2041 * Calculate byte_count before OOB processing. 2042 * It can be used in myoob() later. 2043 */ 2044 byte_count += cnt; 2045 if (recvurg) 2046 goto got_oob; 2047 offset += cnt; 2048 filesize -= cnt; 2049 2050 if (err == -1) { 2051 if (cnt == 0 && offset == 0) 2052 goto oldway; 2053 2054 goto data_err; 2055 } 2056 2057 /* 2058 * We hit the EOF prematurely. 2059 * Perhaps the file was externally truncated. 2060 */ 2061 if (cnt == 0) { 2062 msg = "Transfer finished due to " 2063 "premature end of file."; 2064 break; 2065 } 2066 } 2067 2068 transflag = 0; 2069 reply(226, msg); 2070 return (0); 2071 } 2072 2073 oldway: 2074 if ((buf = malloc(blksize)) == NULL) { 2075 transflag = 0; 2076 reply(451, "Ran out of memory."); 2077 return (-1); 2078 } 2079 2080 while ((cnt = read(filefd, buf, blksize)) > 0 && 2081 write(netfd, buf, cnt) == cnt) 2082 byte_count += cnt; 2083 transflag = 0; 2084 free(buf); 2085 if (cnt != 0) { 2086 if (cnt < 0) 2087 goto file_err; 2088 goto data_err; 2089 } 2090 reply(226, "Transfer complete."); 2091 return (0); 2092 default: 2093 transflag = 0; 2094 reply(550, "Unimplemented TYPE %d in send_data.", type); 2095 return (-1); 2096 } 2097 2098 data_err: 2099 transflag = 0; 2100 perror_reply(426, "Data connection"); 2101 return (-1); 2102 2103 file_err: 2104 transflag = 0; 2105 perror_reply(551, "Error on input file"); 2106 return (-1); 2107 2108 got_oob: 2109 myoob(); 2110 recvurg = 0; 2111 transflag = 0; 2112 return (-1); 2113 } 2114 2115 /* 2116 * Transfer data from peer to "outstr" using the appropriate encapulation of 2117 * the data subject to Mode, Structure, and Type. 2118 * 2119 * N.B.: Form isn't handled. 2120 */ 2121 static int 2122 receive_data(FILE *instr, FILE *outstr) 2123 { 2124 int c; 2125 int cnt, bare_lfs; 2126 char buf[BUFSIZ]; 2127 2128 transflag++; 2129 bare_lfs = 0; 2130 2131 switch (type) { 2132 2133 case TYPE_I: 2134 case TYPE_L: 2135 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 2136 if (recvurg) 2137 goto got_oob; 2138 if (write(fileno(outstr), buf, cnt) != cnt) 2139 goto file_err; 2140 byte_count += cnt; 2141 } 2142 if (recvurg) 2143 goto got_oob; 2144 if (cnt < 0) 2145 goto data_err; 2146 transflag = 0; 2147 return (0); 2148 2149 case TYPE_E: 2150 reply(553, "TYPE E not implemented."); 2151 transflag = 0; 2152 return (-1); 2153 2154 case TYPE_A: 2155 while ((c = getc(instr)) != EOF) { 2156 if (recvurg) 2157 goto got_oob; 2158 byte_count++; 2159 if (c == '\n') 2160 bare_lfs++; 2161 while (c == '\r') { 2162 if (ferror(outstr)) 2163 goto data_err; 2164 if ((c = getc(instr)) != '\n') { 2165 (void) putc ('\r', outstr); 2166 if (c == '\0' || c == EOF) 2167 goto contin2; 2168 } 2169 } 2170 (void) putc(c, outstr); 2171 contin2: ; 2172 } 2173 if (recvurg) 2174 goto got_oob; 2175 fflush(outstr); 2176 if (ferror(instr)) 2177 goto data_err; 2178 if (ferror(outstr)) 2179 goto file_err; 2180 transflag = 0; 2181 if (bare_lfs) { 2182 lreply(226, 2183 "WARNING! %d bare linefeeds received in ASCII mode.", 2184 bare_lfs); 2185 (void)printf(" File may not have transferred correctly.\r\n"); 2186 } 2187 return (0); 2188 default: 2189 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2190 transflag = 0; 2191 return (-1); 2192 } 2193 2194 data_err: 2195 transflag = 0; 2196 perror_reply(426, "Data connection"); 2197 return (-1); 2198 2199 file_err: 2200 transflag = 0; 2201 perror_reply(452, "Error writing to file"); 2202 return (-1); 2203 2204 got_oob: 2205 myoob(); 2206 recvurg = 0; 2207 transflag = 0; 2208 return (-1); 2209 } 2210 2211 void 2212 statfilecmd(char *filename) 2213 { 2214 FILE *fin; 2215 int atstart; 2216 int c, code; 2217 char line[LINE_MAX]; 2218 struct stat st; 2219 2220 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2221 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2222 fin = ftpd_popen(line, "r"); 2223 lreply(code, "Status of %s:", filename); 2224 atstart = 1; 2225 while ((c = getc(fin)) != EOF) { 2226 if (c == '\n') { 2227 if (ferror(stdout)){ 2228 perror_reply(421, "Control connection"); 2229 (void) ftpd_pclose(fin); 2230 dologout(1); 2231 /* NOTREACHED */ 2232 } 2233 if (ferror(fin)) { 2234 perror_reply(551, filename); 2235 (void) ftpd_pclose(fin); 2236 return; 2237 } 2238 (void) putc('\r', stdout); 2239 } 2240 /* 2241 * RFC 959 says neutral text should be prepended before 2242 * a leading 3-digit number followed by whitespace, but 2243 * many ftp clients can be confused by any leading digits, 2244 * as a matter of fact. 2245 */ 2246 if (atstart && isdigit(c)) 2247 (void) putc(' ', stdout); 2248 (void) putc(c, stdout); 2249 atstart = (c == '\n'); 2250 } 2251 (void) ftpd_pclose(fin); 2252 reply(code, "End of status."); 2253 } 2254 2255 void 2256 statcmd(void) 2257 { 2258 union sockunion *su; 2259 u_char *a, *p; 2260 char hname[NI_MAXHOST]; 2261 int ispassive; 2262 2263 if (hostinfo) { 2264 lreply(211, "%s FTP server status:", hostname); 2265 printf(" %s\r\n", version); 2266 } else 2267 lreply(211, "FTP server status:"); 2268 printf(" Connected to %s", remotehost); 2269 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2270 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2271 hname[sizeof(hname) - 1] = 0; 2272 if (strcmp(hname, remotehost) != 0) 2273 printf(" (%s)", hname); 2274 } 2275 printf("\r\n"); 2276 if (logged_in) { 2277 if (guest) 2278 printf(" Logged in anonymously\r\n"); 2279 else 2280 printf(" Logged in as %s\r\n", pw->pw_name); 2281 } else if (askpasswd) 2282 printf(" Waiting for password\r\n"); 2283 else 2284 printf(" Waiting for user name\r\n"); 2285 printf(" TYPE: %s", typenames[type]); 2286 if (type == TYPE_A || type == TYPE_E) 2287 printf(", FORM: %s", formnames[form]); 2288 if (type == TYPE_L) 2289 #if CHAR_BIT == 8 2290 printf(" %d", CHAR_BIT); 2291 #else 2292 printf(" %d", bytesize); /* need definition! */ 2293 #endif 2294 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2295 strunames[stru], modenames[mode]); 2296 if (data != -1) 2297 printf(" Data connection open\r\n"); 2298 else if (pdata != -1) { 2299 ispassive = 1; 2300 su = &pasv_addr; 2301 goto printaddr; 2302 } else if (usedefault == 0) { 2303 ispassive = 0; 2304 su = &data_dest; 2305 printaddr: 2306 #define UC(b) (((int) b) & 0xff) 2307 if (epsvall) { 2308 printf(" EPSV only mode (EPSV ALL)\r\n"); 2309 goto epsvonly; 2310 } 2311 2312 /* PORT/PASV */ 2313 if (su->su_family == AF_INET) { 2314 a = (u_char *) &su->su_sin.sin_addr; 2315 p = (u_char *) &su->su_sin.sin_port; 2316 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2317 ispassive ? "PASV" : "PORT", 2318 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2319 UC(p[0]), UC(p[1])); 2320 } 2321 2322 /* LPRT/LPSV */ 2323 { 2324 int alen, af, i; 2325 2326 switch (su->su_family) { 2327 case AF_INET: 2328 a = (u_char *) &su->su_sin.sin_addr; 2329 p = (u_char *) &su->su_sin.sin_port; 2330 alen = sizeof(su->su_sin.sin_addr); 2331 af = 4; 2332 break; 2333 case AF_INET6: 2334 a = (u_char *) &su->su_sin6.sin6_addr; 2335 p = (u_char *) &su->su_sin6.sin6_port; 2336 alen = sizeof(su->su_sin6.sin6_addr); 2337 af = 6; 2338 break; 2339 default: 2340 af = 0; 2341 break; 2342 } 2343 if (af) { 2344 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2345 af, alen); 2346 for (i = 0; i < alen; i++) 2347 printf("%d,", UC(a[i])); 2348 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2349 } 2350 } 2351 2352 epsvonly:; 2353 /* EPRT/EPSV */ 2354 { 2355 int af; 2356 2357 switch (su->su_family) { 2358 case AF_INET: 2359 af = 1; 2360 break; 2361 case AF_INET6: 2362 af = 2; 2363 break; 2364 default: 2365 af = 0; 2366 break; 2367 } 2368 if (af) { 2369 union sockunion tmp; 2370 2371 tmp = *su; 2372 if (tmp.su_family == AF_INET6) 2373 tmp.su_sin6.sin6_scope_id = 0; 2374 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2375 hname, sizeof(hname) - 1, NULL, 0, 2376 NI_NUMERICHOST)) { 2377 hname[sizeof(hname) - 1] = 0; 2378 printf(" %s |%d|%s|%d|\r\n", 2379 ispassive ? "EPSV" : "EPRT", 2380 af, hname, htons(tmp.su_port)); 2381 } 2382 } 2383 } 2384 #undef UC 2385 } else 2386 printf(" No data connection\r\n"); 2387 reply(211, "End of status."); 2388 } 2389 2390 void 2391 fatalerror(char *s) 2392 { 2393 2394 reply(451, "Error in server: %s", s); 2395 reply(221, "Closing connection due to server error."); 2396 dologout(0); 2397 /* NOTREACHED */ 2398 } 2399 2400 void 2401 reply(int n, const char *fmt, ...) 2402 { 2403 va_list ap; 2404 2405 (void)printf("%d ", n); 2406 va_start(ap, fmt); 2407 (void)vprintf(fmt, ap); 2408 va_end(ap); 2409 (void)printf("\r\n"); 2410 (void)fflush(stdout); 2411 if (ftpdebug) { 2412 syslog(LOG_DEBUG, "<--- %d ", n); 2413 va_start(ap, fmt); 2414 vsyslog(LOG_DEBUG, fmt, ap); 2415 va_end(ap); 2416 } 2417 } 2418 2419 void 2420 lreply(int n, const char *fmt, ...) 2421 { 2422 va_list ap; 2423 2424 (void)printf("%d- ", n); 2425 va_start(ap, fmt); 2426 (void)vprintf(fmt, ap); 2427 va_end(ap); 2428 (void)printf("\r\n"); 2429 (void)fflush(stdout); 2430 if (ftpdebug) { 2431 syslog(LOG_DEBUG, "<--- %d- ", n); 2432 va_start(ap, fmt); 2433 vsyslog(LOG_DEBUG, fmt, ap); 2434 va_end(ap); 2435 } 2436 } 2437 2438 static void 2439 ack(char *s) 2440 { 2441 2442 reply(250, "%s command successful.", s); 2443 } 2444 2445 void 2446 nack(char *s) 2447 { 2448 2449 reply(502, "%s command not implemented.", s); 2450 } 2451 2452 /* ARGSUSED */ 2453 void 2454 yyerror(char *s) 2455 { 2456 char *cp; 2457 2458 if ((cp = strchr(cbuf,'\n'))) 2459 *cp = '\0'; 2460 reply(500, "%s: command not understood.", cbuf); 2461 } 2462 2463 void 2464 delete(char *name) 2465 { 2466 struct stat st; 2467 2468 LOGCMD("delete", name); 2469 if (lstat(name, &st) < 0) { 2470 perror_reply(550, name); 2471 return; 2472 } 2473 if (S_ISDIR(st.st_mode)) { 2474 if (rmdir(name) < 0) { 2475 perror_reply(550, name); 2476 return; 2477 } 2478 goto done; 2479 } 2480 if (guest && noguestmod) { 2481 reply(550, "Operation not permitted."); 2482 return; 2483 } 2484 if (unlink(name) < 0) { 2485 perror_reply(550, name); 2486 return; 2487 } 2488 done: 2489 ack("DELE"); 2490 } 2491 2492 void 2493 cwd(char *path) 2494 { 2495 2496 if (chdir(path) < 0) 2497 perror_reply(550, path); 2498 else 2499 ack("CWD"); 2500 } 2501 2502 void 2503 makedir(char *name) 2504 { 2505 char *s; 2506 2507 LOGCMD("mkdir", name); 2508 if (guest && noguestmkd) 2509 reply(550, "Operation not permitted."); 2510 else if (mkdir(name, 0777) < 0) 2511 perror_reply(550, name); 2512 else { 2513 if ((s = doublequote(name)) == NULL) 2514 fatalerror("Ran out of memory."); 2515 reply(257, "\"%s\" directory created.", s); 2516 free(s); 2517 } 2518 } 2519 2520 void 2521 removedir(char *name) 2522 { 2523 2524 LOGCMD("rmdir", name); 2525 if (rmdir(name) < 0) 2526 perror_reply(550, name); 2527 else 2528 ack("RMD"); 2529 } 2530 2531 void 2532 pwd(void) 2533 { 2534 char *s, path[MAXPATHLEN + 1]; 2535 2536 if (getcwd(path, sizeof(path)) == NULL) 2537 perror_reply(550, "Get current directory"); 2538 else { 2539 if ((s = doublequote(path)) == NULL) 2540 fatalerror("Ran out of memory."); 2541 reply(257, "\"%s\" is current directory.", s); 2542 free(s); 2543 } 2544 } 2545 2546 char * 2547 renamefrom(char *name) 2548 { 2549 struct stat st; 2550 2551 if (guest && noguestmod) { 2552 reply(550, "Operation not permitted."); 2553 return (NULL); 2554 } 2555 if (lstat(name, &st) < 0) { 2556 perror_reply(550, name); 2557 return (NULL); 2558 } 2559 reply(350, "File exists, ready for destination name."); 2560 return (name); 2561 } 2562 2563 void 2564 renamecmd(char *from, char *to) 2565 { 2566 struct stat st; 2567 2568 LOGCMD2("rename", from, to); 2569 2570 if (guest && (stat(to, &st) == 0)) { 2571 reply(550, "%s: permission denied.", to); 2572 return; 2573 } 2574 2575 if (rename(from, to) < 0) 2576 perror_reply(550, "rename"); 2577 else 2578 ack("RNTO"); 2579 } 2580 2581 static void 2582 dolog(struct sockaddr *who) 2583 { 2584 char who_name[NI_MAXHOST]; 2585 2586 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2587 remotehost[sizeof(remotehost) - 1] = 0; 2588 if (getnameinfo(who, who->sa_len, 2589 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2590 *who_name = 0; 2591 who_name[sizeof(who_name) - 1] = 0; 2592 2593 #ifdef SETPROCTITLE 2594 #ifdef VIRTUAL_HOSTING 2595 if (thishost != firsthost) 2596 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2597 remotehost, hostname); 2598 else 2599 #endif 2600 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2601 remotehost); 2602 setproctitle("%s", proctitle); 2603 #endif /* SETPROCTITLE */ 2604 2605 if (logging) { 2606 #ifdef VIRTUAL_HOSTING 2607 if (thishost != firsthost) 2608 syslog(LOG_INFO, "connection from %s (%s) to %s", 2609 remotehost, who_name, hostname); 2610 else 2611 #endif 2612 syslog(LOG_INFO, "connection from %s (%s)", 2613 remotehost, who_name); 2614 } 2615 } 2616 2617 /* 2618 * Record logout in wtmp file 2619 * and exit with supplied status. 2620 */ 2621 void 2622 dologout(int status) 2623 { 2624 /* 2625 * Prevent reception of SIGURG from resulting in a resumption 2626 * back to the main program loop. 2627 */ 2628 transflag = 0; 2629 2630 if (logged_in && dowtmp) { 2631 (void) seteuid(0); 2632 ftpd_logwtmp(ttyline, "", NULL); 2633 } 2634 /* beware of flushing buffers after a SIGPIPE */ 2635 _exit(status); 2636 } 2637 2638 static void 2639 sigurg(int signo) 2640 { 2641 2642 recvurg = 1; 2643 } 2644 2645 static void 2646 myoob(void) 2647 { 2648 char *cp; 2649 2650 /* only process if transfer occurring */ 2651 if (!transflag) 2652 return; 2653 cp = tmpline; 2654 if (getline(cp, 7, stdin) == NULL) { 2655 reply(221, "You could at least say goodbye."); 2656 dologout(0); 2657 } 2658 upper(cp); 2659 if (strcmp(cp, "ABOR\r\n") == 0) { 2660 tmpline[0] = '\0'; 2661 reply(426, "Transfer aborted. Data connection closed."); 2662 reply(226, "Abort successful."); 2663 } 2664 if (strcmp(cp, "STAT\r\n") == 0) { 2665 tmpline[0] = '\0'; 2666 if (file_size != -1) 2667 reply(213, "Status: %jd of %jd bytes transferred.", 2668 (intmax_t)byte_count, (intmax_t)file_size); 2669 else 2670 reply(213, "Status: %jd bytes transferred.", 2671 (intmax_t)byte_count); 2672 } 2673 } 2674 2675 /* 2676 * Note: a response of 425 is not mentioned as a possible response to 2677 * the PASV command in RFC959. However, it has been blessed as 2678 * a legitimate response by Jon Postel in a telephone conversation 2679 * with Rick Adams on 25 Jan 89. 2680 */ 2681 void 2682 passive(void) 2683 { 2684 int len, on; 2685 char *p, *a; 2686 2687 if (pdata >= 0) /* close old port if one set */ 2688 close(pdata); 2689 2690 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2691 if (pdata < 0) { 2692 perror_reply(425, "Can't open passive connection"); 2693 return; 2694 } 2695 on = 1; 2696 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2697 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2698 2699 (void) seteuid(0); 2700 2701 #ifdef IP_PORTRANGE 2702 if (ctrl_addr.su_family == AF_INET) { 2703 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2704 : IP_PORTRANGE_DEFAULT; 2705 2706 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2707 &on, sizeof(on)) < 0) 2708 goto pasv_error; 2709 } 2710 #endif 2711 #ifdef IPV6_PORTRANGE 2712 if (ctrl_addr.su_family == AF_INET6) { 2713 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2714 : IPV6_PORTRANGE_DEFAULT; 2715 2716 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2717 &on, sizeof(on)) < 0) 2718 goto pasv_error; 2719 } 2720 #endif 2721 2722 pasv_addr = ctrl_addr; 2723 pasv_addr.su_port = 0; 2724 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2725 goto pasv_error; 2726 2727 (void) seteuid(pw->pw_uid); 2728 2729 len = sizeof(pasv_addr); 2730 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2731 goto pasv_error; 2732 if (listen(pdata, 1) < 0) 2733 goto pasv_error; 2734 if (pasv_addr.su_family == AF_INET) 2735 a = (char *) &pasv_addr.su_sin.sin_addr; 2736 else if (pasv_addr.su_family == AF_INET6 && 2737 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2738 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2739 else 2740 goto pasv_error; 2741 2742 p = (char *) &pasv_addr.su_port; 2743 2744 #define UC(b) (((int) b) & 0xff) 2745 2746 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2747 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2748 return; 2749 2750 pasv_error: 2751 (void) seteuid(pw->pw_uid); 2752 (void) close(pdata); 2753 pdata = -1; 2754 perror_reply(425, "Can't open passive connection"); 2755 return; 2756 } 2757 2758 /* 2759 * Long Passive defined in RFC 1639. 2760 * 228 Entering Long Passive Mode 2761 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2762 */ 2763 2764 void 2765 long_passive(char *cmd, int pf) 2766 { 2767 int len, on; 2768 char *p, *a; 2769 2770 if (pdata >= 0) /* close old port if one set */ 2771 close(pdata); 2772 2773 if (pf != PF_UNSPEC) { 2774 if (ctrl_addr.su_family != pf) { 2775 switch (ctrl_addr.su_family) { 2776 case AF_INET: 2777 pf = 1; 2778 break; 2779 case AF_INET6: 2780 pf = 2; 2781 break; 2782 default: 2783 pf = 0; 2784 break; 2785 } 2786 /* 2787 * XXX 2788 * only EPRT/EPSV ready clients will understand this 2789 */ 2790 if (strcmp(cmd, "EPSV") == 0 && pf) { 2791 reply(522, "Network protocol mismatch, " 2792 "use (%d)", pf); 2793 } else 2794 reply(501, "Network protocol mismatch."); /*XXX*/ 2795 2796 return; 2797 } 2798 } 2799 2800 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2801 if (pdata < 0) { 2802 perror_reply(425, "Can't open passive connection"); 2803 return; 2804 } 2805 on = 1; 2806 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2807 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2808 2809 (void) seteuid(0); 2810 2811 pasv_addr = ctrl_addr; 2812 pasv_addr.su_port = 0; 2813 len = pasv_addr.su_len; 2814 2815 #ifdef IP_PORTRANGE 2816 if (ctrl_addr.su_family == AF_INET) { 2817 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2818 : IP_PORTRANGE_DEFAULT; 2819 2820 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2821 &on, sizeof(on)) < 0) 2822 goto pasv_error; 2823 } 2824 #endif 2825 #ifdef IPV6_PORTRANGE 2826 if (ctrl_addr.su_family == AF_INET6) { 2827 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2828 : IPV6_PORTRANGE_DEFAULT; 2829 2830 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2831 &on, sizeof(on)) < 0) 2832 goto pasv_error; 2833 } 2834 #endif 2835 2836 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2837 goto pasv_error; 2838 2839 (void) seteuid(pw->pw_uid); 2840 2841 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2842 goto pasv_error; 2843 if (listen(pdata, 1) < 0) 2844 goto pasv_error; 2845 2846 #define UC(b) (((int) b) & 0xff) 2847 2848 if (strcmp(cmd, "LPSV") == 0) { 2849 p = (char *)&pasv_addr.su_port; 2850 switch (pasv_addr.su_family) { 2851 case AF_INET: 2852 a = (char *) &pasv_addr.su_sin.sin_addr; 2853 v4_reply: 2854 reply(228, 2855 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2856 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2857 2, UC(p[0]), UC(p[1])); 2858 return; 2859 case AF_INET6: 2860 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2861 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2862 goto v4_reply; 2863 } 2864 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2865 reply(228, 2866 "Entering Long Passive Mode " 2867 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2868 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2869 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2870 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2871 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2872 2, UC(p[0]), UC(p[1])); 2873 return; 2874 } 2875 } else if (strcmp(cmd, "EPSV") == 0) { 2876 switch (pasv_addr.su_family) { 2877 case AF_INET: 2878 case AF_INET6: 2879 reply(229, "Entering Extended Passive Mode (|||%d|)", 2880 ntohs(pasv_addr.su_port)); 2881 return; 2882 } 2883 } else { 2884 /* more proper error code? */ 2885 } 2886 2887 pasv_error: 2888 (void) seteuid(pw->pw_uid); 2889 (void) close(pdata); 2890 pdata = -1; 2891 perror_reply(425, "Can't open passive connection"); 2892 return; 2893 } 2894 2895 /* 2896 * Generate unique name for file with basename "local" 2897 * and open the file in order to avoid possible races. 2898 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2899 * Return descriptor to the file, set "name" to its name. 2900 * 2901 * Generates failure reply on error. 2902 */ 2903 static int 2904 guniquefd(char *local, char **name) 2905 { 2906 static char new[MAXPATHLEN]; 2907 struct stat st; 2908 char *cp; 2909 int count; 2910 int fd; 2911 2912 cp = strrchr(local, '/'); 2913 if (cp) 2914 *cp = '\0'; 2915 if (stat(cp ? local : ".", &st) < 0) { 2916 perror_reply(553, cp ? local : "."); 2917 return (-1); 2918 } 2919 if (cp) { 2920 /* 2921 * Let not overwrite dirname with counter suffix. 2922 * -4 is for /nn\0 2923 * In this extreme case dot won't be put in front of suffix. 2924 */ 2925 if (strlen(local) > sizeof(new) - 4) { 2926 reply(553, "Pathname too long."); 2927 return (-1); 2928 } 2929 *cp = '/'; 2930 } 2931 /* -4 is for the .nn<null> we put on the end below */ 2932 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2933 cp = new + strlen(new); 2934 /* 2935 * Don't generate dotfile unless requested explicitly. 2936 * This covers the case when basename gets truncated off 2937 * by buffer size. 2938 */ 2939 if (cp > new && cp[-1] != '/') 2940 *cp++ = '.'; 2941 for (count = 0; count < 100; count++) { 2942 /* At count 0 try unmodified name */ 2943 if (count) 2944 (void)sprintf(cp, "%d", count); 2945 if ((fd = open(count ? new : local, 2946 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2947 *name = count ? new : local; 2948 return (fd); 2949 } 2950 if (errno != EEXIST) { 2951 perror_reply(553, count ? new : local); 2952 return (-1); 2953 } 2954 } 2955 reply(452, "Unique file name cannot be created."); 2956 return (-1); 2957 } 2958 2959 /* 2960 * Format and send reply containing system error number. 2961 */ 2962 void 2963 perror_reply(int code, char *string) 2964 { 2965 2966 reply(code, "%s: %s.", string, strerror(errno)); 2967 } 2968 2969 static char *onefile[] = { 2970 "", 2971 0 2972 }; 2973 2974 void 2975 send_file_list(char *whichf) 2976 { 2977 struct stat st; 2978 DIR *dirp = NULL; 2979 struct dirent *dir; 2980 FILE *dout = NULL; 2981 char **dirlist, *dirname; 2982 int simple = 0; 2983 int freeglob = 0; 2984 glob_t gl; 2985 2986 if (strpbrk(whichf, "~{[*?") != NULL) { 2987 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2988 2989 memset(&gl, 0, sizeof(gl)); 2990 gl.gl_matchc = MAXGLOBARGS; 2991 flags |= GLOB_LIMIT; 2992 freeglob = 1; 2993 if (glob(whichf, flags, 0, &gl)) { 2994 reply(550, "No matching files found."); 2995 goto out; 2996 } else if (gl.gl_pathc == 0) { 2997 errno = ENOENT; 2998 perror_reply(550, whichf); 2999 goto out; 3000 } 3001 dirlist = gl.gl_pathv; 3002 } else { 3003 onefile[0] = whichf; 3004 dirlist = onefile; 3005 simple = 1; 3006 } 3007 3008 while ((dirname = *dirlist++)) { 3009 if (stat(dirname, &st) < 0) { 3010 /* 3011 * If user typed "ls -l", etc, and the client 3012 * used NLST, do what the user meant. 3013 */ 3014 if (dirname[0] == '-' && *dirlist == NULL && 3015 transflag == 0) { 3016 retrieve(_PATH_LS " %s", dirname); 3017 goto out; 3018 } 3019 perror_reply(550, whichf); 3020 if (dout != NULL) { 3021 (void) fclose(dout); 3022 transflag = 0; 3023 data = -1; 3024 pdata = -1; 3025 } 3026 goto out; 3027 } 3028 3029 if (S_ISREG(st.st_mode)) { 3030 if (dout == NULL) { 3031 dout = dataconn("file list", -1, "w"); 3032 if (dout == NULL) 3033 goto out; 3034 transflag++; 3035 } 3036 fprintf(dout, "%s%s\n", dirname, 3037 type == TYPE_A ? "\r" : ""); 3038 byte_count += strlen(dirname) + 1; 3039 continue; 3040 } else if (!S_ISDIR(st.st_mode)) 3041 continue; 3042 3043 if ((dirp = opendir(dirname)) == NULL) 3044 continue; 3045 3046 while ((dir = readdir(dirp)) != NULL) { 3047 char nbuf[MAXPATHLEN]; 3048 3049 if (recvurg) { 3050 myoob(); 3051 recvurg = 0; 3052 transflag = 0; 3053 goto out; 3054 } 3055 3056 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3057 continue; 3058 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3059 dir->d_namlen == 2) 3060 continue; 3061 3062 snprintf(nbuf, sizeof(nbuf), 3063 "%s/%s", dirname, dir->d_name); 3064 3065 /* 3066 * We have to do a stat to insure it's 3067 * not a directory or special file. 3068 */ 3069 if (simple || (stat(nbuf, &st) == 0 && 3070 S_ISREG(st.st_mode))) { 3071 if (dout == NULL) { 3072 dout = dataconn("file list", -1, "w"); 3073 if (dout == NULL) 3074 goto out; 3075 transflag++; 3076 } 3077 if (nbuf[0] == '.' && nbuf[1] == '/') 3078 fprintf(dout, "%s%s\n", &nbuf[2], 3079 type == TYPE_A ? "\r" : ""); 3080 else 3081 fprintf(dout, "%s%s\n", nbuf, 3082 type == TYPE_A ? "\r" : ""); 3083 byte_count += strlen(nbuf) + 1; 3084 } 3085 } 3086 (void) closedir(dirp); 3087 } 3088 3089 if (dout == NULL) 3090 reply(550, "No files found."); 3091 else if (ferror(dout) != 0) 3092 perror_reply(550, "Data connection"); 3093 else 3094 reply(226, "Transfer complete."); 3095 3096 transflag = 0; 3097 if (dout != NULL) 3098 (void) fclose(dout); 3099 data = -1; 3100 pdata = -1; 3101 out: 3102 if (freeglob) { 3103 freeglob = 0; 3104 globfree(&gl); 3105 } 3106 } 3107 3108 void 3109 reapchild(int signo) 3110 { 3111 while (waitpid(-1, NULL, WNOHANG) > 0); 3112 } 3113 3114 #ifdef OLD_SETPROCTITLE 3115 /* 3116 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3117 * Warning, since this is usually started from inetd.conf, it often doesn't 3118 * have much of an environment or arglist to overwrite. 3119 */ 3120 void 3121 setproctitle(const char *fmt, ...) 3122 { 3123 int i; 3124 va_list ap; 3125 char *p, *bp, ch; 3126 char buf[LINE_MAX]; 3127 3128 va_start(ap, fmt); 3129 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3130 3131 /* make ps print our process name */ 3132 p = Argv[0]; 3133 *p++ = '-'; 3134 3135 i = strlen(buf); 3136 if (i > LastArgv - p - 2) { 3137 i = LastArgv - p - 2; 3138 buf[i] = '\0'; 3139 } 3140 bp = buf; 3141 while (ch = *bp++) 3142 if (ch != '\n' && ch != '\r') 3143 *p++ = ch; 3144 while (p < LastArgv) 3145 *p++ = ' '; 3146 } 3147 #endif /* OLD_SETPROCTITLE */ 3148 3149 static void 3150 appendf(char **strp, char *fmt, ...) 3151 { 3152 va_list ap; 3153 char *ostr, *p; 3154 3155 va_start(ap, fmt); 3156 vasprintf(&p, fmt, ap); 3157 va_end(ap); 3158 if (p == NULL) 3159 fatalerror("Ran out of memory."); 3160 if (*strp == NULL) 3161 *strp = p; 3162 else { 3163 ostr = *strp; 3164 asprintf(strp, "%s%s", ostr, p); 3165 if (*strp == NULL) 3166 fatalerror("Ran out of memory."); 3167 free(ostr); 3168 } 3169 } 3170 3171 static void 3172 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3173 { 3174 char *msg = NULL; 3175 char wd[MAXPATHLEN + 1]; 3176 3177 if (logging <= 1) 3178 return; 3179 3180 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3181 strcpy(wd, strerror(errno)); 3182 3183 appendf(&msg, "%s", cmd); 3184 if (file1) 3185 appendf(&msg, " %s", file1); 3186 if (file2) 3187 appendf(&msg, " %s", file2); 3188 if (cnt >= 0) 3189 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3190 appendf(&msg, " (wd: %s", wd); 3191 if (guest || dochroot) 3192 appendf(&msg, "; chrooted"); 3193 appendf(&msg, ")"); 3194 syslog(LOG_INFO, "%s", msg); 3195 free(msg); 3196 } 3197 3198 static void 3199 logxfer(char *name, off_t size, time_t start) 3200 { 3201 char buf[MAXPATHLEN + 1024]; 3202 char path[MAXPATHLEN + 1]; 3203 time_t now; 3204 3205 if (statfd >= 0) { 3206 time(&now); 3207 if (realpath(name, path) == NULL) { 3208 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3209 return; 3210 } 3211 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3212 ctime(&now)+4, ident, remotehost, 3213 path, (intmax_t)size, 3214 (long)(now - start + (now == start))); 3215 write(statfd, buf, strlen(buf)); 3216 } 3217 } 3218 3219 static char * 3220 doublequote(char *s) 3221 { 3222 int n; 3223 char *p, *s2; 3224 3225 for (p = s, n = 0; *p; p++) 3226 if (*p == '"') 3227 n++; 3228 3229 if ((s2 = malloc(p - s + n + 1)) == NULL) 3230 return (NULL); 3231 3232 for (p = s2; *s; s++, p++) { 3233 if ((*p = *s) == '"') 3234 *(++p) = '"'; 3235 } 3236 *p = '\0'; 3237 3238 return (s2); 3239 } 3240 3241 /* setup server socket for specified address family */ 3242 /* if af is PF_UNSPEC more than one socket may be returned */ 3243 /* the returned list is dynamically allocated, so caller needs to free it */ 3244 static int * 3245 socksetup(int af, char *bindname, const char *bindport) 3246 { 3247 struct addrinfo hints, *res, *r; 3248 int error, maxs, *s, *socks; 3249 const int on = 1; 3250 3251 memset(&hints, 0, sizeof(hints)); 3252 hints.ai_flags = AI_PASSIVE; 3253 hints.ai_family = af; 3254 hints.ai_socktype = SOCK_STREAM; 3255 error = getaddrinfo(bindname, bindport, &hints, &res); 3256 if (error) { 3257 syslog(LOG_ERR, "%s", gai_strerror(error)); 3258 if (error == EAI_SYSTEM) 3259 syslog(LOG_ERR, "%s", strerror(errno)); 3260 return NULL; 3261 } 3262 3263 /* Count max number of sockets we may open */ 3264 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3265 ; 3266 socks = malloc((maxs + 1) * sizeof(int)); 3267 if (!socks) { 3268 freeaddrinfo(res); 3269 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3270 return NULL; 3271 } 3272 3273 *socks = 0; /* num of sockets counter at start of array */ 3274 s = socks + 1; 3275 for (r = res; r; r = r->ai_next) { 3276 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3277 if (*s < 0) { 3278 syslog(LOG_DEBUG, "control socket: %m"); 3279 continue; 3280 } 3281 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3282 &on, sizeof(on)) < 0) 3283 syslog(LOG_WARNING, 3284 "control setsockopt (SO_REUSEADDR): %m"); 3285 if (r->ai_family == AF_INET6) { 3286 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3287 &on, sizeof(on)) < 0) 3288 syslog(LOG_WARNING, 3289 "control setsockopt (IPV6_V6ONLY): %m"); 3290 } 3291 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3292 syslog(LOG_DEBUG, "control bind: %m"); 3293 close(*s); 3294 continue; 3295 } 3296 (*socks)++; 3297 s++; 3298 } 3299 3300 if (res) 3301 freeaddrinfo(res); 3302 3303 if (*socks == 0) { 3304 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3305 free(socks); 3306 return NULL; 3307 } 3308 return(socks); 3309 } 3310