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