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 syslog(LOG_ERR, 457 "%s: already locked", pid_file); 458 else 459 syslog(LOG_ERR, "%s: %m", pid_file); 460 exit(1); 461 } 462 snprintf(buf, sizeof(buf), 463 "%lu\n", (unsigned long) getpid()); 464 if (write(fd, buf, strlen(buf)) < 0) { 465 syslog(LOG_ERR, "%s: write: %m", pid_file); 466 exit(1); 467 } 468 /* Leave the pid file open and locked */ 469 } 470 /* 471 * Loop forever accepting connection requests and forking off 472 * children to handle them. 473 */ 474 while (1) { 475 FD_COPY(&defreadfds, &readfds); 476 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 477 if (nfds <= 0) { 478 if (nfds < 0 && errno != EINTR) 479 syslog(LOG_WARNING, "select: %m"); 480 continue; 481 } 482 483 pid = -1; 484 for (i = 1; i <= *ctl_sock; i++) 485 if (FD_ISSET(ctl_sock[i], &readfds)) { 486 addrlen = sizeof(his_addr); 487 fd = accept(ctl_sock[i], 488 (struct sockaddr *)&his_addr, 489 &addrlen); 490 if (fd >= 0) { 491 if ((pid = fork()) == 0) { 492 /* child */ 493 (void) dup2(fd, 0); 494 (void) dup2(fd, 1); 495 close(ctl_sock[i]); 496 } else 497 close(fd); 498 } 499 } 500 if (pid == 0) 501 break; 502 } 503 } else { 504 addrlen = sizeof(his_addr); 505 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 506 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 507 exit(1); 508 } 509 } 510 511 sa.sa_handler = SIG_DFL; 512 (void)sigaction(SIGCHLD, &sa, NULL); 513 514 sa.sa_handler = sigurg; 515 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 516 (void)sigaction(SIGURG, &sa, NULL); 517 518 sigfillset(&sa.sa_mask); /* block all signals in handler */ 519 sa.sa_flags = SA_RESTART; 520 sa.sa_handler = sigquit; 521 (void)sigaction(SIGHUP, &sa, NULL); 522 (void)sigaction(SIGINT, &sa, NULL); 523 (void)sigaction(SIGQUIT, &sa, NULL); 524 (void)sigaction(SIGTERM, &sa, NULL); 525 526 sa.sa_handler = lostconn; 527 (void)sigaction(SIGPIPE, &sa, NULL); 528 529 addrlen = sizeof(ctrl_addr); 530 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 531 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 532 exit(1); 533 } 534 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 535 #ifdef VIRTUAL_HOSTING 536 /* select our identity from virtual host table */ 537 selecthost(&ctrl_addr); 538 #endif 539 #ifdef IP_TOS 540 if (ctrl_addr.su_family == AF_INET) 541 { 542 tos = IPTOS_LOWDELAY; 543 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 544 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 545 } 546 #endif 547 /* 548 * Disable Nagle on the control channel so that we don't have to wait 549 * for peer's ACK before issuing our next reply. 550 */ 551 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 552 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 553 554 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 555 556 /* set this here so klogin can use it... */ 557 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 558 559 /* Try to handle urgent data inline */ 560 #ifdef SO_OOBINLINE 561 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 562 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 563 #endif 564 565 #ifdef F_SETOWN 566 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 567 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 568 #endif 569 dolog((struct sockaddr *)&his_addr); 570 /* 571 * Set up default state 572 */ 573 data = -1; 574 type = TYPE_A; 575 form = FORM_N; 576 stru = STRU_F; 577 mode = MODE_S; 578 tmpline[0] = '\0'; 579 580 /* If logins are disabled, print out the message. */ 581 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 582 while (fgets(line, sizeof(line), fd) != NULL) { 583 if ((cp = strchr(line, '\n')) != NULL) 584 *cp = '\0'; 585 lreply(530, "%s", line); 586 } 587 (void) fflush(stdout); 588 (void) fclose(fd); 589 reply(530, "System not available."); 590 exit(0); 591 } 592 #ifdef VIRTUAL_HOSTING 593 fd = fopen(thishost->welcome, "r"); 594 #else 595 fd = fopen(_PATH_FTPWELCOME, "r"); 596 #endif 597 if (fd != NULL) { 598 while (fgets(line, sizeof(line), fd) != NULL) { 599 if ((cp = strchr(line, '\n')) != NULL) 600 *cp = '\0'; 601 lreply(220, "%s", line); 602 } 603 (void) fflush(stdout); 604 (void) fclose(fd); 605 /* reply(220,) must follow */ 606 } 607 #ifndef VIRTUAL_HOSTING 608 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 609 fatalerror("Ran out of memory."); 610 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 611 hostname[0] = '\0'; 612 hostname[MAXHOSTNAMELEN - 1] = '\0'; 613 #endif 614 if (hostinfo) 615 reply(220, "%s FTP server (%s) ready.", hostname, version); 616 else 617 reply(220, "FTP server ready."); 618 for (;;) 619 (void) yyparse(); 620 /* NOTREACHED */ 621 } 622 623 static void 624 lostconn(int signo) 625 { 626 627 if (ftpdebug) 628 syslog(LOG_DEBUG, "lost connection"); 629 dologout(1); 630 } 631 632 static void 633 sigquit(int signo) 634 { 635 636 syslog(LOG_ERR, "got signal %d", signo); 637 dologout(1); 638 } 639 640 #ifdef VIRTUAL_HOSTING 641 /* 642 * read in virtual host tables (if they exist) 643 */ 644 645 static void 646 inithosts(void) 647 { 648 int insert; 649 size_t len; 650 FILE *fp; 651 char *cp, *mp, *line; 652 char *hostname; 653 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 654 struct ftphost *hrp, *lhrp; 655 struct addrinfo hints, *res, *ai; 656 657 /* 658 * Fill in the default host information 659 */ 660 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 661 fatalerror("Ran out of memory."); 662 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 663 hostname[0] = '\0'; 664 hostname[MAXHOSTNAMELEN - 1] = '\0'; 665 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 666 fatalerror("Ran out of memory."); 667 hrp->hostname = hostname; 668 hrp->hostinfo = NULL; 669 670 memset(&hints, 0, sizeof(hints)); 671 hints.ai_flags = AI_CANONNAME; 672 hints.ai_family = AF_UNSPEC; 673 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 674 hrp->hostinfo = res; 675 hrp->statfile = _PATH_FTPDSTATFILE; 676 hrp->welcome = _PATH_FTPWELCOME; 677 hrp->loginmsg = _PATH_FTPLOGINMESG; 678 hrp->anonuser = "ftp"; 679 hrp->next = NULL; 680 thishost = firsthost = lhrp = hrp; 681 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 682 int addrsize, gothost; 683 void *addr; 684 struct hostent *hp; 685 686 while ((line = fgetln(fp, &len)) != NULL) { 687 int i, hp_error; 688 689 /* skip comments */ 690 if (line[0] == '#') 691 continue; 692 if (line[len - 1] == '\n') { 693 line[len - 1] = '\0'; 694 mp = NULL; 695 } else { 696 if ((mp = malloc(len + 1)) == NULL) 697 fatalerror("Ran out of memory."); 698 memcpy(mp, line, len); 699 mp[len] = '\0'; 700 line = mp; 701 } 702 cp = strtok(line, " \t"); 703 /* skip empty lines */ 704 if (cp == NULL) 705 goto nextline; 706 vhost = cp; 707 708 /* set defaults */ 709 anonuser = "ftp"; 710 statfile = _PATH_FTPDSTATFILE; 711 welcome = _PATH_FTPWELCOME; 712 loginmsg = _PATH_FTPLOGINMESG; 713 714 /* 715 * Preparse the line so we can use its info 716 * for all the addresses associated with 717 * the virtual host name. 718 * Field 0, the virtual host name, is special: 719 * it's already parsed off and will be strdup'ed 720 * later, after we know its canonical form. 721 */ 722 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 723 if (*cp != '-' && (cp = strdup(cp))) 724 switch (i) { 725 case 1: /* anon user permissions */ 726 anonuser = cp; 727 break; 728 case 2: /* statistics file */ 729 statfile = cp; 730 break; 731 case 3: /* welcome message */ 732 welcome = cp; 733 break; 734 case 4: /* login message */ 735 loginmsg = cp; 736 break; 737 default: /* programming error */ 738 abort(); 739 /* NOTREACHED */ 740 } 741 742 hints.ai_flags = 0; 743 hints.ai_family = AF_UNSPEC; 744 hints.ai_flags = AI_PASSIVE; 745 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 746 goto nextline; 747 for (ai = res; ai != NULL && ai->ai_addr != NULL; 748 ai = ai->ai_next) { 749 750 gothost = 0; 751 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 752 struct addrinfo *hi; 753 754 for (hi = hrp->hostinfo; hi != NULL; 755 hi = hi->ai_next) 756 if (hi->ai_addrlen == ai->ai_addrlen && 757 memcmp(hi->ai_addr, 758 ai->ai_addr, 759 ai->ai_addr->sa_len) == 0) { 760 gothost++; 761 break; 762 } 763 if (gothost) 764 break; 765 } 766 if (hrp == NULL) { 767 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 768 goto nextline; 769 hrp->hostname = NULL; 770 insert = 1; 771 } else { 772 if (hrp->hostinfo && hrp->hostinfo != res) 773 freeaddrinfo(hrp->hostinfo); 774 insert = 0; /* host already in the chain */ 775 } 776 hrp->hostinfo = res; 777 778 /* 779 * determine hostname to use. 780 * force defined name if there is a valid alias 781 * otherwise fallback to primary hostname 782 */ 783 /* XXX: getaddrinfo() can't do alias check */ 784 switch(hrp->hostinfo->ai_family) { 785 case AF_INET: 786 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 787 addrsize = sizeof(struct in_addr); 788 break; 789 case AF_INET6: 790 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 791 addrsize = sizeof(struct in6_addr); 792 break; 793 default: 794 /* should not reach here */ 795 freeaddrinfo(hrp->hostinfo); 796 if (insert) 797 free(hrp); /*not in chain, can free*/ 798 else 799 hrp->hostinfo = NULL; /*mark as blank*/ 800 goto nextline; 801 /* NOTREACHED */ 802 } 803 if ((hp = getipnodebyaddr(addr, addrsize, 804 hrp->hostinfo->ai_family, 805 &hp_error)) != NULL) { 806 if (strcmp(vhost, hp->h_name) != 0) { 807 if (hp->h_aliases == NULL) 808 vhost = hp->h_name; 809 else { 810 i = 0; 811 while (hp->h_aliases[i] && 812 strcmp(vhost, hp->h_aliases[i]) != 0) 813 ++i; 814 if (hp->h_aliases[i] == NULL) 815 vhost = hp->h_name; 816 } 817 } 818 } 819 if (hrp->hostname && 820 strcmp(hrp->hostname, vhost) != 0) { 821 free(hrp->hostname); 822 hrp->hostname = NULL; 823 } 824 if (hrp->hostname == NULL && 825 (hrp->hostname = strdup(vhost)) == NULL) { 826 freeaddrinfo(hrp->hostinfo); 827 hrp->hostinfo = NULL; /* mark as blank */ 828 if (hp) 829 freehostent(hp); 830 goto nextline; 831 } 832 hrp->anonuser = anonuser; 833 hrp->statfile = statfile; 834 hrp->welcome = welcome; 835 hrp->loginmsg = loginmsg; 836 if (insert) { 837 hrp->next = NULL; 838 lhrp->next = hrp; 839 lhrp = hrp; 840 } 841 if (hp) 842 freehostent(hp); 843 } 844 nextline: 845 if (mp) 846 free(mp); 847 } 848 (void) fclose(fp); 849 } 850 } 851 852 static void 853 selecthost(union sockunion *su) 854 { 855 struct ftphost *hrp; 856 u_int16_t port; 857 #ifdef INET6 858 struct in6_addr *mapped_in6 = NULL; 859 #endif 860 struct addrinfo *hi; 861 862 #ifdef INET6 863 /* 864 * XXX IPv4 mapped IPv6 addr consideraton, 865 * specified in rfc2373. 866 */ 867 if (su->su_family == AF_INET6 && 868 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 869 mapped_in6 = &su->su_sin6.sin6_addr; 870 #endif 871 872 hrp = thishost = firsthost; /* default */ 873 port = su->su_port; 874 su->su_port = 0; 875 while (hrp != NULL) { 876 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 877 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 878 thishost = hrp; 879 goto found; 880 } 881 #ifdef INET6 882 /* XXX IPv4 mapped IPv6 addr consideraton */ 883 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 884 (memcmp(&mapped_in6->s6_addr[12], 885 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 886 sizeof(struct in_addr)) == 0)) { 887 thishost = hrp; 888 goto found; 889 } 890 #endif 891 } 892 hrp = hrp->next; 893 } 894 found: 895 su->su_port = port; 896 /* setup static variables as appropriate */ 897 hostname = thishost->hostname; 898 ftpuser = thishost->anonuser; 899 } 900 #endif 901 902 /* 903 * Helper function for sgetpwnam(). 904 */ 905 static char * 906 sgetsave(char *s) 907 { 908 char *new = malloc(strlen(s) + 1); 909 910 if (new == NULL) { 911 reply(421, "Ran out of memory."); 912 dologout(1); 913 /* NOTREACHED */ 914 } 915 (void) strcpy(new, s); 916 return (new); 917 } 918 919 /* 920 * Save the result of a getpwnam. Used for USER command, since 921 * the data returned must not be clobbered by any other command 922 * (e.g., globbing). 923 * NB: The data returned by sgetpwnam() will remain valid until 924 * the next call to this function. Its difference from getpwnam() 925 * is that sgetpwnam() is known to be called from ftpd code only. 926 */ 927 static struct passwd * 928 sgetpwnam(char *name) 929 { 930 static struct passwd save; 931 struct passwd *p; 932 933 if ((p = getpwnam(name)) == NULL) 934 return (p); 935 if (save.pw_name) { 936 free(save.pw_name); 937 free(save.pw_passwd); 938 free(save.pw_gecos); 939 free(save.pw_dir); 940 free(save.pw_shell); 941 } 942 save = *p; 943 save.pw_name = sgetsave(p->pw_name); 944 save.pw_passwd = sgetsave(p->pw_passwd); 945 save.pw_gecos = sgetsave(p->pw_gecos); 946 save.pw_dir = sgetsave(p->pw_dir); 947 save.pw_shell = sgetsave(p->pw_shell); 948 return (&save); 949 } 950 951 static int login_attempts; /* number of failed login attempts */ 952 static int askpasswd; /* had user command, ask for passwd */ 953 static char curname[MAXLOGNAME]; /* current USER name */ 954 955 /* 956 * USER command. 957 * Sets global passwd pointer pw if named account exists and is acceptable; 958 * sets askpasswd if a PASS command is expected. If logged in previously, 959 * need to reset state. If name is "ftp" or "anonymous", the name is not in 960 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 961 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 962 * requesting login privileges. Disallow anyone who does not have a standard 963 * shell as returned by getusershell(). Disallow anyone mentioned in the file 964 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 965 */ 966 void 967 user(char *name) 968 { 969 char *cp, *shell; 970 971 if (logged_in) { 972 if (guest) { 973 reply(530, "Can't change user from guest login."); 974 return; 975 } else if (dochroot) { 976 reply(530, "Can't change user from chroot user."); 977 return; 978 } 979 end_login(); 980 } 981 982 guest = 0; 983 #ifdef VIRTUAL_HOSTING 984 pw = sgetpwnam(thishost->anonuser); 985 #else 986 pw = sgetpwnam("ftp"); 987 #endif 988 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 989 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 990 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 991 reply(530, "User %s access denied.", name); 992 else if (pw != NULL) { 993 guest = 1; 994 askpasswd = 1; 995 reply(331, 996 "Guest login ok, send your email address as password."); 997 } else 998 reply(530, "User %s unknown.", name); 999 if (!askpasswd && logging) 1000 syslog(LOG_NOTICE, 1001 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1002 return; 1003 } 1004 if (anon_only != 0) { 1005 reply(530, "Sorry, only anonymous ftp allowed."); 1006 return; 1007 } 1008 1009 if ((pw = sgetpwnam(name))) { 1010 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1011 shell = _PATH_BSHELL; 1012 setusershell(); 1013 while ((cp = getusershell()) != NULL) 1014 if (strcmp(cp, shell) == 0) 1015 break; 1016 endusershell(); 1017 1018 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1019 reply(530, "User %s access denied.", name); 1020 if (logging) 1021 syslog(LOG_NOTICE, 1022 "FTP LOGIN REFUSED FROM %s, %s", 1023 remotehost, name); 1024 pw = NULL; 1025 return; 1026 } 1027 } 1028 if (logging) 1029 strncpy(curname, name, sizeof(curname)-1); 1030 1031 pwok = 0; 1032 #ifdef USE_PAM 1033 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1034 #endif 1035 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1036 pwok = (pw != NULL) && 1037 opieaccessfile(remotehost) && 1038 opiealways(pw->pw_dir); 1039 reply(331, "Response to %s %s for %s.", 1040 opieprompt, pwok ? "requested" : "required", name); 1041 } else { 1042 pwok = 1; 1043 reply(331, "Password required for %s.", name); 1044 } 1045 askpasswd = 1; 1046 /* 1047 * Delay before reading passwd after first failed 1048 * attempt to slow down passwd-guessing programs. 1049 */ 1050 if (login_attempts) 1051 sleep(login_attempts); 1052 } 1053 1054 /* 1055 * Check if a user is in the file "fname", 1056 * return a pointer to a malloc'd string with the rest 1057 * of the matching line in "residue" if not NULL. 1058 */ 1059 static int 1060 checkuser(char *fname, char *name, int pwset, char **residue) 1061 { 1062 FILE *fd; 1063 int found = 0; 1064 size_t len; 1065 char *line, *mp, *p; 1066 1067 if ((fd = fopen(fname, "r")) != NULL) { 1068 while (!found && (line = fgetln(fd, &len)) != NULL) { 1069 /* skip comments */ 1070 if (line[0] == '#') 1071 continue; 1072 if (line[len - 1] == '\n') { 1073 line[len - 1] = '\0'; 1074 mp = NULL; 1075 } else { 1076 if ((mp = malloc(len + 1)) == NULL) 1077 fatalerror("Ran out of memory."); 1078 memcpy(mp, line, len); 1079 mp[len] = '\0'; 1080 line = mp; 1081 } 1082 /* avoid possible leading and trailing whitespace */ 1083 p = strtok(line, " \t"); 1084 /* skip empty lines */ 1085 if (p == NULL) 1086 goto nextline; 1087 /* 1088 * if first chr is '@', check group membership 1089 */ 1090 if (p[0] == '@') { 1091 int i = 0; 1092 struct group *grp; 1093 1094 if (p[1] == '\0') /* single @ matches anyone */ 1095 found = 1; 1096 else { 1097 if ((grp = getgrnam(p+1)) == NULL) 1098 goto nextline; 1099 /* 1100 * Check user's default group 1101 */ 1102 if (pwset && grp->gr_gid == pw->pw_gid) 1103 found = 1; 1104 /* 1105 * Check supplementary groups 1106 */ 1107 while (!found && grp->gr_mem[i]) 1108 found = strcmp(name, 1109 grp->gr_mem[i++]) 1110 == 0; 1111 } 1112 } 1113 /* 1114 * Otherwise, just check for username match 1115 */ 1116 else 1117 found = strcmp(p, name) == 0; 1118 /* 1119 * Save the rest of line to "residue" if matched 1120 */ 1121 if (found && residue) { 1122 if ((p = strtok(NULL, "")) != NULL) 1123 p += strspn(p, " \t"); 1124 if (p && *p) { 1125 if ((*residue = strdup(p)) == NULL) 1126 fatalerror("Ran out of memory."); 1127 } else 1128 *residue = NULL; 1129 } 1130 nextline: 1131 if (mp) 1132 free(mp); 1133 } 1134 (void) fclose(fd); 1135 } 1136 return (found); 1137 } 1138 1139 /* 1140 * Terminate login as previous user, if any, resetting state; 1141 * used when USER command is given or login fails. 1142 */ 1143 static void 1144 end_login(void) 1145 { 1146 #ifdef USE_PAM 1147 int e; 1148 #endif 1149 1150 (void) seteuid(0); 1151 if (logged_in && dowtmp) 1152 ftpd_logwtmp(ttyline, "", NULL); 1153 pw = NULL; 1154 #ifdef LOGIN_CAP 1155 setusercontext(NULL, getpwuid(0), 0, 1156 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1157 LOGIN_SETMAC); 1158 #endif 1159 #ifdef USE_PAM 1160 if (pamh) { 1161 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1162 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1163 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1164 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1165 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1166 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1167 pamh = NULL; 1168 } 1169 #endif 1170 logged_in = 0; 1171 guest = 0; 1172 dochroot = 0; 1173 } 1174 1175 #ifdef USE_PAM 1176 1177 /* 1178 * the following code is stolen from imap-uw PAM authentication module and 1179 * login.c 1180 */ 1181 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1182 1183 struct cred_t { 1184 const char *uname; /* user name */ 1185 const char *pass; /* password */ 1186 }; 1187 typedef struct cred_t cred_t; 1188 1189 static int 1190 auth_conv(int num_msg, const struct pam_message **msg, 1191 struct pam_response **resp, void *appdata) 1192 { 1193 int i; 1194 cred_t *cred = (cred_t *) appdata; 1195 struct pam_response *reply; 1196 1197 reply = calloc(num_msg, sizeof *reply); 1198 if (reply == NULL) 1199 return PAM_BUF_ERR; 1200 1201 for (i = 0; i < num_msg; i++) { 1202 switch (msg[i]->msg_style) { 1203 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1204 reply[i].resp_retcode = PAM_SUCCESS; 1205 reply[i].resp = COPY_STRING(cred->uname); 1206 /* PAM frees resp. */ 1207 break; 1208 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1209 reply[i].resp_retcode = PAM_SUCCESS; 1210 reply[i].resp = COPY_STRING(cred->pass); 1211 /* PAM frees resp. */ 1212 break; 1213 case PAM_TEXT_INFO: 1214 case PAM_ERROR_MSG: 1215 reply[i].resp_retcode = PAM_SUCCESS; 1216 reply[i].resp = NULL; 1217 break; 1218 default: /* unknown message style */ 1219 free(reply); 1220 return PAM_CONV_ERR; 1221 } 1222 } 1223 1224 *resp = reply; 1225 return PAM_SUCCESS; 1226 } 1227 1228 /* 1229 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1230 * authenticated, or 1 if not authenticated. If some sort of PAM system 1231 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1232 * function returns -1. This can be used as an indication that we should 1233 * fall back to a different authentication mechanism. 1234 */ 1235 static int 1236 auth_pam(struct passwd **ppw, const char *pass) 1237 { 1238 const char *tmpl_user; 1239 const void *item; 1240 int rval; 1241 int e; 1242 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1243 struct pam_conv conv = { &auth_conv, &auth_cred }; 1244 1245 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1246 if (e != PAM_SUCCESS) { 1247 /* 1248 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1249 * if context creation has failed in the first place. 1250 */ 1251 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1252 return -1; 1253 } 1254 1255 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1256 if (e != PAM_SUCCESS) { 1257 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1258 pam_strerror(pamh, e)); 1259 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1260 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1261 } 1262 pamh = NULL; 1263 return -1; 1264 } 1265 1266 e = pam_authenticate(pamh, 0); 1267 switch (e) { 1268 case PAM_SUCCESS: 1269 /* 1270 * With PAM we support the concept of a "template" 1271 * user. The user enters a login name which is 1272 * authenticated by PAM, usually via a remote service 1273 * such as RADIUS or TACACS+. If authentication 1274 * succeeds, a different but related "template" name 1275 * is used for setting the credentials, shell, and 1276 * home directory. The name the user enters need only 1277 * exist on the remote authentication server, but the 1278 * template name must be present in the local password 1279 * database. 1280 * 1281 * This is supported by two various mechanisms in the 1282 * individual modules. However, from the application's 1283 * point of view, the template user is always passed 1284 * back as a changed value of the PAM_USER item. 1285 */ 1286 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1287 PAM_SUCCESS) { 1288 tmpl_user = (const char *) item; 1289 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1290 *ppw = getpwnam(tmpl_user); 1291 } else 1292 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1293 pam_strerror(pamh, e)); 1294 rval = 0; 1295 break; 1296 1297 case PAM_AUTH_ERR: 1298 case PAM_USER_UNKNOWN: 1299 case PAM_MAXTRIES: 1300 rval = 1; 1301 break; 1302 1303 default: 1304 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1305 rval = -1; 1306 break; 1307 } 1308 1309 if (rval == 0) { 1310 e = pam_acct_mgmt(pamh, 0); 1311 if (e != PAM_SUCCESS) { 1312 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1313 pam_strerror(pamh, e)); 1314 rval = 1; 1315 } 1316 } 1317 1318 if (rval != 0) { 1319 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1320 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1321 } 1322 pamh = NULL; 1323 } 1324 return rval; 1325 } 1326 1327 #endif /* USE_PAM */ 1328 1329 void 1330 pass(char *passwd) 1331 { 1332 int rval; 1333 FILE *fd; 1334 #ifdef LOGIN_CAP 1335 login_cap_t *lc = NULL; 1336 #endif 1337 #ifdef USE_PAM 1338 int e; 1339 #endif 1340 char *residue = NULL; 1341 char *xpasswd; 1342 1343 if (logged_in || askpasswd == 0) { 1344 reply(503, "Login with USER first."); 1345 return; 1346 } 1347 askpasswd = 0; 1348 if (!guest) { /* "ftp" is only account allowed no password */ 1349 if (pw == NULL) { 1350 rval = 1; /* failure below */ 1351 goto skip; 1352 } 1353 #ifdef USE_PAM 1354 rval = auth_pam(&pw, passwd); 1355 if (rval >= 0) { 1356 opieunlock(); 1357 goto skip; 1358 } 1359 #endif 1360 if (opieverify(&opiedata, passwd) == 0) 1361 xpasswd = pw->pw_passwd; 1362 else if (pwok) { 1363 xpasswd = crypt(passwd, pw->pw_passwd); 1364 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1365 xpasswd = ":"; 1366 } else { 1367 rval = 1; 1368 goto skip; 1369 } 1370 rval = strcmp(pw->pw_passwd, xpasswd); 1371 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1372 rval = 1; /* failure */ 1373 skip: 1374 /* 1375 * If rval == 1, the user failed the authentication check 1376 * above. If rval == 0, either PAM or local authentication 1377 * succeeded. 1378 */ 1379 if (rval) { 1380 reply(530, "Login incorrect."); 1381 if (logging) { 1382 syslog(LOG_NOTICE, 1383 "FTP LOGIN FAILED FROM %s", 1384 remotehost); 1385 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1386 "FTP LOGIN FAILED FROM %s, %s", 1387 remotehost, curname); 1388 } 1389 pw = NULL; 1390 if (login_attempts++ >= 5) { 1391 syslog(LOG_NOTICE, 1392 "repeated login failures from %s", 1393 remotehost); 1394 exit(0); 1395 } 1396 return; 1397 } 1398 } 1399 login_attempts = 0; /* this time successful */ 1400 if (setegid(pw->pw_gid) < 0) { 1401 reply(550, "Can't set gid."); 1402 return; 1403 } 1404 /* May be overridden by login.conf */ 1405 (void) umask(defumask); 1406 #ifdef LOGIN_CAP 1407 if ((lc = login_getpwclass(pw)) != NULL) { 1408 char remote_ip[NI_MAXHOST]; 1409 1410 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1411 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1412 NI_NUMERICHOST)) 1413 *remote_ip = 0; 1414 remote_ip[sizeof(remote_ip) - 1] = 0; 1415 if (!auth_hostok(lc, remotehost, remote_ip)) { 1416 syslog(LOG_INFO|LOG_AUTH, 1417 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1418 pw->pw_name); 1419 reply(530, "Permission denied."); 1420 pw = NULL; 1421 return; 1422 } 1423 if (!auth_timeok(lc, time(NULL))) { 1424 reply(530, "Login not available right now."); 1425 pw = NULL; 1426 return; 1427 } 1428 } 1429 setusercontext(lc, pw, 0, 1430 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1431 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1432 #else 1433 setlogin(pw->pw_name); 1434 (void) initgroups(pw->pw_name, pw->pw_gid); 1435 #endif 1436 1437 #ifdef USE_PAM 1438 if (pamh) { 1439 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1440 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1441 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1442 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1443 } 1444 } 1445 #endif 1446 1447 /* open wtmp before chroot */ 1448 if (dowtmp) 1449 ftpd_logwtmp(ttyline, pw->pw_name, 1450 (struct sockaddr *)&his_addr); 1451 logged_in = 1; 1452 1453 if (guest && stats && statfd < 0) 1454 #ifdef VIRTUAL_HOSTING 1455 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1456 #else 1457 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1458 #endif 1459 if (statfd < 0) 1460 stats = 0; 1461 1462 dochroot = 1463 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1464 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1465 || login_getcapbool(lc, "ftp-chroot", 0) 1466 #endif 1467 ; 1468 chrootdir = NULL; 1469 /* 1470 * For a chrooted local user, 1471 * a) see whether ftpchroot(5) specifies a chroot directory, 1472 * b) extract the directory pathname from the line, 1473 * c) expand it to the absolute pathname if necessary. 1474 */ 1475 if (dochroot && residue && 1476 (chrootdir = strtok(residue, " \t")) != NULL) { 1477 if (chrootdir[0] != '/') 1478 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1479 else 1480 chrootdir = strdup(chrootdir); /* make it permanent */ 1481 if (chrootdir == NULL) 1482 fatalerror("Ran out of memory."); 1483 } 1484 if (guest || dochroot) { 1485 /* 1486 * If no chroot directory set yet, use the login directory. 1487 * Copy it so it can be modified while pw->pw_dir stays intact. 1488 */ 1489 if (chrootdir == NULL && 1490 (chrootdir = strdup(pw->pw_dir)) == NULL) 1491 fatalerror("Ran out of memory."); 1492 /* 1493 * Check for the "/chroot/./home" syntax, 1494 * separate the chroot and home directory pathnames. 1495 */ 1496 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1497 *(homedir++) = '\0'; /* wipe '/' */ 1498 homedir++; /* skip '.' */ 1499 } else { 1500 /* 1501 * We MUST do a chdir() after the chroot. Otherwise 1502 * the old current directory will be accessible as "." 1503 * outside the new root! 1504 */ 1505 homedir = "/"; 1506 } 1507 /* 1508 * Finally, do chroot() 1509 */ 1510 if (chroot(chrootdir) < 0) { 1511 reply(550, "Can't change root."); 1512 goto bad; 1513 } 1514 } else /* real user w/o chroot */ 1515 homedir = pw->pw_dir; 1516 /* 1517 * Set euid *before* doing chdir() so 1518 * a) the user won't be carried to a directory that he couldn't reach 1519 * on his own due to no permission to upper path components, 1520 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1521 * (uid 0 has no root power over NFS if not mapped explicitly.) 1522 */ 1523 if (seteuid(pw->pw_uid) < 0) { 1524 reply(550, "Can't set uid."); 1525 goto bad; 1526 } 1527 if (chdir(homedir) < 0) { 1528 if (guest || dochroot) { 1529 reply(550, "Can't change to base directory."); 1530 goto bad; 1531 } else { 1532 if (chdir("/") < 0) { 1533 reply(550, "Root is inaccessible."); 1534 goto bad; 1535 } 1536 lreply(230, "No directory! Logging in with home=/."); 1537 } 1538 } 1539 1540 /* 1541 * Display a login message, if it exists. 1542 * N.B. reply(230,) must follow the message. 1543 */ 1544 #ifdef VIRTUAL_HOSTING 1545 fd = fopen(thishost->loginmsg, "r"); 1546 #else 1547 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1548 #endif 1549 if (fd != NULL) { 1550 char *cp, line[LINE_MAX]; 1551 1552 while (fgets(line, sizeof(line), fd) != NULL) { 1553 if ((cp = strchr(line, '\n')) != NULL) 1554 *cp = '\0'; 1555 lreply(230, "%s", line); 1556 } 1557 (void) fflush(stdout); 1558 (void) fclose(fd); 1559 } 1560 if (guest) { 1561 if (ident != NULL) 1562 free(ident); 1563 ident = strdup(passwd); 1564 if (ident == NULL) 1565 fatalerror("Ran out of memory."); 1566 1567 reply(230, "Guest login ok, access restrictions apply."); 1568 #ifdef SETPROCTITLE 1569 #ifdef VIRTUAL_HOSTING 1570 if (thishost != firsthost) 1571 snprintf(proctitle, sizeof(proctitle), 1572 "%s: anonymous(%s)/%s", remotehost, hostname, 1573 passwd); 1574 else 1575 #endif 1576 snprintf(proctitle, sizeof(proctitle), 1577 "%s: anonymous/%s", remotehost, passwd); 1578 setproctitle("%s", proctitle); 1579 #endif /* SETPROCTITLE */ 1580 if (logging) 1581 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1582 remotehost, passwd); 1583 } else { 1584 if (dochroot) 1585 reply(230, "User %s logged in, " 1586 "access restrictions apply.", pw->pw_name); 1587 else 1588 reply(230, "User %s logged in.", pw->pw_name); 1589 1590 #ifdef SETPROCTITLE 1591 snprintf(proctitle, sizeof(proctitle), 1592 "%s: user/%s", remotehost, pw->pw_name); 1593 setproctitle("%s", proctitle); 1594 #endif /* SETPROCTITLE */ 1595 if (logging) 1596 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1597 remotehost, pw->pw_name); 1598 } 1599 if (guest || dochroot) 1600 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1601 #ifdef LOGIN_CAP 1602 login_close(lc); 1603 #endif 1604 if (residue) 1605 free(residue); 1606 return; 1607 bad: 1608 /* Forget all about it... */ 1609 #ifdef LOGIN_CAP 1610 login_close(lc); 1611 #endif 1612 if (residue) 1613 free(residue); 1614 end_login(); 1615 } 1616 1617 void 1618 retrieve(char *cmd, char *name) 1619 { 1620 FILE *fin, *dout; 1621 struct stat st; 1622 int (*closefunc)(FILE *); 1623 time_t start; 1624 1625 if (cmd == 0) { 1626 fin = fopen(name, "r"), closefunc = fclose; 1627 st.st_size = 0; 1628 } else { 1629 char line[BUFSIZ]; 1630 1631 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1632 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1633 st.st_size = -1; 1634 st.st_blksize = BUFSIZ; 1635 } 1636 if (fin == NULL) { 1637 if (errno != 0) { 1638 perror_reply(550, name); 1639 if (cmd == 0) { 1640 LOGCMD("get", name); 1641 } 1642 } 1643 return; 1644 } 1645 byte_count = -1; 1646 if (cmd == 0) { 1647 if (fstat(fileno(fin), &st) < 0) { 1648 perror_reply(550, name); 1649 goto done; 1650 } 1651 if (!S_ISREG(st.st_mode)) { 1652 /* 1653 * Never sending a raw directory is a workaround 1654 * for buggy clients that will attempt to RETR 1655 * a directory before listing it, e.g., Mozilla. 1656 * Preventing a guest from getting irregular files 1657 * is a simple security measure. 1658 */ 1659 if (S_ISDIR(st.st_mode) || guest) { 1660 reply(550, "%s: not a plain file.", name); 1661 goto done; 1662 } 1663 st.st_size = -1; 1664 /* st.st_blksize is set for all descriptor types */ 1665 } 1666 } 1667 if (restart_point) { 1668 if (type == TYPE_A) { 1669 off_t i, n; 1670 int c; 1671 1672 n = restart_point; 1673 i = 0; 1674 while (i++ < n) { 1675 if ((c=getc(fin)) == EOF) { 1676 perror_reply(550, name); 1677 goto done; 1678 } 1679 if (c == '\n') 1680 i++; 1681 } 1682 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1683 perror_reply(550, name); 1684 goto done; 1685 } 1686 } 1687 dout = dataconn(name, st.st_size, "w"); 1688 if (dout == NULL) 1689 goto done; 1690 time(&start); 1691 send_data(fin, dout, st.st_blksize, st.st_size, 1692 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1693 if (cmd == 0 && guest && stats && byte_count > 0) 1694 logxfer(name, byte_count, start); 1695 (void) fclose(dout); 1696 data = -1; 1697 pdata = -1; 1698 done: 1699 if (cmd == 0) 1700 LOGBYTES("get", name, byte_count); 1701 (*closefunc)(fin); 1702 } 1703 1704 void 1705 store(char *name, char *mode, int unique) 1706 { 1707 int fd; 1708 FILE *fout, *din; 1709 int (*closefunc)(FILE *); 1710 1711 if (*mode == 'a') { /* APPE */ 1712 if (unique) { 1713 /* Programming error */ 1714 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1715 unique = 0; 1716 } 1717 if (guest && noguestmod) { 1718 reply(550, "Appending to existing file denied."); 1719 goto err; 1720 } 1721 restart_point = 0; /* not affected by preceding REST */ 1722 } 1723 if (unique) /* STOU overrides REST */ 1724 restart_point = 0; 1725 if (guest && noguestmod) { 1726 if (restart_point) { /* guest STOR w/REST */ 1727 reply(550, "Modifying existing file denied."); 1728 goto err; 1729 } else /* treat guest STOR as STOU */ 1730 unique = 1; 1731 } 1732 1733 if (restart_point) 1734 mode = "r+"; /* so ASCII manual seek can work */ 1735 if (unique) { 1736 if ((fd = guniquefd(name, &name)) < 0) 1737 goto err; 1738 fout = fdopen(fd, mode); 1739 } else 1740 fout = fopen(name, mode); 1741 closefunc = fclose; 1742 if (fout == NULL) { 1743 perror_reply(553, name); 1744 goto err; 1745 } 1746 byte_count = -1; 1747 if (restart_point) { 1748 if (type == TYPE_A) { 1749 off_t i, n; 1750 int c; 1751 1752 n = restart_point; 1753 i = 0; 1754 while (i++ < n) { 1755 if ((c=getc(fout)) == EOF) { 1756 perror_reply(550, name); 1757 goto done; 1758 } 1759 if (c == '\n') 1760 i++; 1761 } 1762 /* 1763 * We must do this seek to "current" position 1764 * because we are changing from reading to 1765 * writing. 1766 */ 1767 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1768 perror_reply(550, name); 1769 goto done; 1770 } 1771 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1772 perror_reply(550, name); 1773 goto done; 1774 } 1775 } 1776 din = dataconn(name, -1, "r"); 1777 if (din == NULL) 1778 goto done; 1779 if (receive_data(din, fout) == 0) { 1780 if (unique) 1781 reply(226, "Transfer complete (unique file name:%s).", 1782 name); 1783 else 1784 reply(226, "Transfer complete."); 1785 } 1786 (void) fclose(din); 1787 data = -1; 1788 pdata = -1; 1789 done: 1790 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1791 (*closefunc)(fout); 1792 return; 1793 err: 1794 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1795 return; 1796 } 1797 1798 static FILE * 1799 getdatasock(char *mode) 1800 { 1801 int on = 1, s, t, tries; 1802 1803 if (data >= 0) 1804 return (fdopen(data, mode)); 1805 1806 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1807 if (s < 0) 1808 goto bad; 1809 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1810 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1811 /* anchor socket to avoid multi-homing problems */ 1812 data_source = ctrl_addr; 1813 data_source.su_port = htons(dataport); 1814 (void) seteuid(0); 1815 for (tries = 1; ; tries++) { 1816 /* 1817 * We should loop here since it's possible that 1818 * another ftpd instance has passed this point and is 1819 * trying to open a data connection in active mode now. 1820 * Until the other connection is opened, we'll be getting 1821 * EADDRINUSE because no SOCK_STREAM sockets in the system 1822 * can share both local and remote addresses, localIP:20 1823 * and *:* in this case. 1824 */ 1825 if (bind(s, (struct sockaddr *)&data_source, 1826 data_source.su_len) >= 0) 1827 break; 1828 if (errno != EADDRINUSE || tries > 10) 1829 goto bad; 1830 sleep(tries); 1831 } 1832 (void) seteuid(pw->pw_uid); 1833 #ifdef IP_TOS 1834 if (data_source.su_family == AF_INET) 1835 { 1836 on = IPTOS_THROUGHPUT; 1837 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1838 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1839 } 1840 #endif 1841 #ifdef TCP_NOPUSH 1842 /* 1843 * Turn off push flag to keep sender TCP from sending short packets 1844 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1845 * to set the send buffer size as well, but that may not be desirable 1846 * in heavy-load situations. 1847 */ 1848 on = 1; 1849 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1850 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1851 #endif 1852 #ifdef SO_SNDBUF 1853 on = 65536; 1854 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1855 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1856 #endif 1857 1858 return (fdopen(s, mode)); 1859 bad: 1860 /* Return the real value of errno (close may change it) */ 1861 t = errno; 1862 (void) seteuid(pw->pw_uid); 1863 (void) close(s); 1864 errno = t; 1865 return (NULL); 1866 } 1867 1868 static FILE * 1869 dataconn(char *name, off_t size, char *mode) 1870 { 1871 char sizebuf[32]; 1872 FILE *file; 1873 int retry = 0, tos, conerrno; 1874 1875 file_size = size; 1876 byte_count = 0; 1877 if (size != -1) 1878 (void) snprintf(sizebuf, sizeof(sizebuf), 1879 " (%jd bytes)", (intmax_t)size); 1880 else 1881 *sizebuf = '\0'; 1882 if (pdata >= 0) { 1883 union sockunion from; 1884 int flags; 1885 int s, fromlen = ctrl_addr.su_len; 1886 struct timeval timeout; 1887 fd_set set; 1888 1889 FD_ZERO(&set); 1890 FD_SET(pdata, &set); 1891 1892 timeout.tv_usec = 0; 1893 timeout.tv_sec = 120; 1894 1895 /* 1896 * Granted a socket is in the blocking I/O mode, 1897 * accept() will block after a successful select() 1898 * if the selected connection dies in between. 1899 * Therefore set the non-blocking I/O flag here. 1900 */ 1901 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1902 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1903 goto pdata_err; 1904 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1905 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1906 goto pdata_err; 1907 (void) close(pdata); 1908 pdata = s; 1909 /* 1910 * Unset the inherited non-blocking I/O flag 1911 * on the child socket so stdio can work on it. 1912 */ 1913 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1914 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1915 goto pdata_err; 1916 #ifdef IP_TOS 1917 if (from.su_family == AF_INET) 1918 { 1919 tos = IPTOS_THROUGHPUT; 1920 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1921 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1922 } 1923 #endif 1924 reply(150, "Opening %s mode data connection for '%s'%s.", 1925 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1926 return (fdopen(pdata, mode)); 1927 pdata_err: 1928 reply(425, "Can't open data connection."); 1929 (void) close(pdata); 1930 pdata = -1; 1931 return (NULL); 1932 } 1933 if (data >= 0) { 1934 reply(125, "Using existing data connection for '%s'%s.", 1935 name, sizebuf); 1936 usedefault = 1; 1937 return (fdopen(data, mode)); 1938 } 1939 if (usedefault) 1940 data_dest = his_addr; 1941 usedefault = 1; 1942 do { 1943 file = getdatasock(mode); 1944 if (file == NULL) { 1945 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1946 1947 if (getnameinfo((struct sockaddr *)&data_source, 1948 data_source.su_len, 1949 hostbuf, sizeof(hostbuf) - 1, 1950 portbuf, sizeof(portbuf) - 1, 1951 NI_NUMERICHOST|NI_NUMERICSERV)) 1952 *hostbuf = *portbuf = 0; 1953 hostbuf[sizeof(hostbuf) - 1] = 0; 1954 portbuf[sizeof(portbuf) - 1] = 0; 1955 reply(425, "Can't create data socket (%s,%s): %s.", 1956 hostbuf, portbuf, strerror(errno)); 1957 return (NULL); 1958 } 1959 data = fileno(file); 1960 conerrno = 0; 1961 if (connect(data, (struct sockaddr *)&data_dest, 1962 data_dest.su_len) == 0) 1963 break; 1964 conerrno = errno; 1965 (void) fclose(file); 1966 data = -1; 1967 if (conerrno == EADDRINUSE) { 1968 sleep(swaitint); 1969 retry += swaitint; 1970 } else { 1971 break; 1972 } 1973 } while (retry <= swaitmax); 1974 if (conerrno != 0) { 1975 reply(425, "Can't build data connection: %s.", 1976 strerror(conerrno)); 1977 return (NULL); 1978 } 1979 reply(150, "Opening %s mode data connection for '%s'%s.", 1980 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1981 return (file); 1982 } 1983 1984 /* 1985 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1986 * encapsulation of the data subject to Mode, Structure, and Type. 1987 * 1988 * NB: Form isn't handled. 1989 */ 1990 static int 1991 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 1992 { 1993 int c, cp, filefd, netfd; 1994 char *buf; 1995 off_t cnt; 1996 1997 transflag++; 1998 switch (type) { 1999 2000 case TYPE_A: 2001 cp = '\0'; 2002 while ((c = getc(instr)) != EOF) { 2003 if (recvurg) 2004 goto got_oob; 2005 byte_count++; 2006 if (c == '\n' && cp != '\r') { 2007 if (ferror(outstr)) 2008 goto data_err; 2009 (void) putc('\r', outstr); 2010 } 2011 (void) putc(c, outstr); 2012 cp = c; 2013 } 2014 if (recvurg) 2015 goto got_oob; 2016 fflush(outstr); 2017 transflag = 0; 2018 if (ferror(instr)) 2019 goto file_err; 2020 if (ferror(outstr)) 2021 goto data_err; 2022 reply(226, "Transfer complete."); 2023 return (0); 2024 2025 case TYPE_I: 2026 case TYPE_L: 2027 /* 2028 * isreg is only set if we are not doing restart and we 2029 * are sending a regular file 2030 */ 2031 netfd = fileno(outstr); 2032 filefd = fileno(instr); 2033 2034 if (isreg) { 2035 char *msg = "Transfer complete."; 2036 off_t offset; 2037 int err; 2038 2039 cnt = offset = 0; 2040 2041 while (filesize > 0) { 2042 err = sendfile(filefd, netfd, offset, 0, 2043 NULL, &cnt, 0); 2044 /* 2045 * Calculate byte_count before OOB processing. 2046 * It can be used in myoob() later. 2047 */ 2048 byte_count += cnt; 2049 if (recvurg) 2050 goto got_oob; 2051 offset += cnt; 2052 filesize -= cnt; 2053 2054 if (err == -1) { 2055 if (cnt == 0 && offset == 0) 2056 goto oldway; 2057 2058 goto data_err; 2059 } 2060 2061 /* 2062 * We hit the EOF prematurely. 2063 * Perhaps the file was externally truncated. 2064 */ 2065 if (cnt == 0) { 2066 msg = "Transfer finished due to " 2067 "premature end of file."; 2068 break; 2069 } 2070 } 2071 2072 transflag = 0; 2073 reply(226, msg); 2074 return (0); 2075 } 2076 2077 oldway: 2078 if ((buf = malloc(blksize)) == NULL) { 2079 transflag = 0; 2080 reply(451, "Ran out of memory."); 2081 return (-1); 2082 } 2083 2084 while ((cnt = read(filefd, buf, blksize)) > 0 && 2085 write(netfd, buf, cnt) == cnt) 2086 byte_count += cnt; 2087 transflag = 0; 2088 free(buf); 2089 if (cnt != 0) { 2090 if (cnt < 0) 2091 goto file_err; 2092 goto data_err; 2093 } 2094 reply(226, "Transfer complete."); 2095 return (0); 2096 default: 2097 transflag = 0; 2098 reply(550, "Unimplemented TYPE %d in send_data.", type); 2099 return (-1); 2100 } 2101 2102 data_err: 2103 transflag = 0; 2104 perror_reply(426, "Data connection"); 2105 return (-1); 2106 2107 file_err: 2108 transflag = 0; 2109 perror_reply(551, "Error on input file"); 2110 return (-1); 2111 2112 got_oob: 2113 myoob(); 2114 recvurg = 0; 2115 transflag = 0; 2116 return (-1); 2117 } 2118 2119 /* 2120 * Transfer data from peer to "outstr" using the appropriate encapulation of 2121 * the data subject to Mode, Structure, and Type. 2122 * 2123 * N.B.: Form isn't handled. 2124 */ 2125 static int 2126 receive_data(FILE *instr, FILE *outstr) 2127 { 2128 int c; 2129 int cnt, bare_lfs; 2130 char buf[BUFSIZ]; 2131 2132 transflag++; 2133 bare_lfs = 0; 2134 2135 switch (type) { 2136 2137 case TYPE_I: 2138 case TYPE_L: 2139 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 2140 if (recvurg) 2141 goto got_oob; 2142 if (write(fileno(outstr), buf, cnt) != cnt) 2143 goto file_err; 2144 byte_count += cnt; 2145 } 2146 if (recvurg) 2147 goto got_oob; 2148 if (cnt < 0) 2149 goto data_err; 2150 transflag = 0; 2151 return (0); 2152 2153 case TYPE_E: 2154 reply(553, "TYPE E not implemented."); 2155 transflag = 0; 2156 return (-1); 2157 2158 case TYPE_A: 2159 while ((c = getc(instr)) != EOF) { 2160 if (recvurg) 2161 goto got_oob; 2162 byte_count++; 2163 if (c == '\n') 2164 bare_lfs++; 2165 while (c == '\r') { 2166 if (ferror(outstr)) 2167 goto data_err; 2168 if ((c = getc(instr)) != '\n') { 2169 (void) putc ('\r', outstr); 2170 if (c == '\0' || c == EOF) 2171 goto contin2; 2172 } 2173 } 2174 (void) putc(c, outstr); 2175 contin2: ; 2176 } 2177 if (recvurg) 2178 goto got_oob; 2179 fflush(outstr); 2180 if (ferror(instr)) 2181 goto data_err; 2182 if (ferror(outstr)) 2183 goto file_err; 2184 transflag = 0; 2185 if (bare_lfs) { 2186 lreply(226, 2187 "WARNING! %d bare linefeeds received in ASCII mode.", 2188 bare_lfs); 2189 (void)printf(" File may not have transferred correctly.\r\n"); 2190 } 2191 return (0); 2192 default: 2193 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2194 transflag = 0; 2195 return (-1); 2196 } 2197 2198 data_err: 2199 transflag = 0; 2200 perror_reply(426, "Data connection"); 2201 return (-1); 2202 2203 file_err: 2204 transflag = 0; 2205 perror_reply(452, "Error writing to file"); 2206 return (-1); 2207 2208 got_oob: 2209 myoob(); 2210 recvurg = 0; 2211 transflag = 0; 2212 return (-1); 2213 } 2214 2215 void 2216 statfilecmd(char *filename) 2217 { 2218 FILE *fin; 2219 int atstart; 2220 int c, code; 2221 char line[LINE_MAX]; 2222 struct stat st; 2223 2224 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2225 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2226 fin = ftpd_popen(line, "r"); 2227 lreply(code, "Status of %s:", filename); 2228 atstart = 1; 2229 while ((c = getc(fin)) != EOF) { 2230 if (c == '\n') { 2231 if (ferror(stdout)){ 2232 perror_reply(421, "Control connection"); 2233 (void) ftpd_pclose(fin); 2234 dologout(1); 2235 /* NOTREACHED */ 2236 } 2237 if (ferror(fin)) { 2238 perror_reply(551, filename); 2239 (void) ftpd_pclose(fin); 2240 return; 2241 } 2242 (void) putc('\r', stdout); 2243 } 2244 /* 2245 * RFC 959 says neutral text should be prepended before 2246 * a leading 3-digit number followed by whitespace, but 2247 * many ftp clients can be confused by any leading digits, 2248 * as a matter of fact. 2249 */ 2250 if (atstart && isdigit(c)) 2251 (void) putc(' ', stdout); 2252 (void) putc(c, stdout); 2253 atstart = (c == '\n'); 2254 } 2255 (void) ftpd_pclose(fin); 2256 reply(code, "End of status."); 2257 } 2258 2259 void 2260 statcmd(void) 2261 { 2262 union sockunion *su; 2263 u_char *a, *p; 2264 char hname[NI_MAXHOST]; 2265 int ispassive; 2266 2267 if (hostinfo) { 2268 lreply(211, "%s FTP server status:", hostname); 2269 printf(" %s\r\n", version); 2270 } else 2271 lreply(211, "FTP server status:"); 2272 printf(" Connected to %s", remotehost); 2273 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2274 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2275 hname[sizeof(hname) - 1] = 0; 2276 if (strcmp(hname, remotehost) != 0) 2277 printf(" (%s)", hname); 2278 } 2279 printf("\r\n"); 2280 if (logged_in) { 2281 if (guest) 2282 printf(" Logged in anonymously\r\n"); 2283 else 2284 printf(" Logged in as %s\r\n", pw->pw_name); 2285 } else if (askpasswd) 2286 printf(" Waiting for password\r\n"); 2287 else 2288 printf(" Waiting for user name\r\n"); 2289 printf(" TYPE: %s", typenames[type]); 2290 if (type == TYPE_A || type == TYPE_E) 2291 printf(", FORM: %s", formnames[form]); 2292 if (type == TYPE_L) 2293 #if CHAR_BIT == 8 2294 printf(" %d", CHAR_BIT); 2295 #else 2296 printf(" %d", bytesize); /* need definition! */ 2297 #endif 2298 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2299 strunames[stru], modenames[mode]); 2300 if (data != -1) 2301 printf(" Data connection open\r\n"); 2302 else if (pdata != -1) { 2303 ispassive = 1; 2304 su = &pasv_addr; 2305 goto printaddr; 2306 } else if (usedefault == 0) { 2307 ispassive = 0; 2308 su = &data_dest; 2309 printaddr: 2310 #define UC(b) (((int) b) & 0xff) 2311 if (epsvall) { 2312 printf(" EPSV only mode (EPSV ALL)\r\n"); 2313 goto epsvonly; 2314 } 2315 2316 /* PORT/PASV */ 2317 if (su->su_family == AF_INET) { 2318 a = (u_char *) &su->su_sin.sin_addr; 2319 p = (u_char *) &su->su_sin.sin_port; 2320 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2321 ispassive ? "PASV" : "PORT", 2322 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2323 UC(p[0]), UC(p[1])); 2324 } 2325 2326 /* LPRT/LPSV */ 2327 { 2328 int alen, af, i; 2329 2330 switch (su->su_family) { 2331 case AF_INET: 2332 a = (u_char *) &su->su_sin.sin_addr; 2333 p = (u_char *) &su->su_sin.sin_port; 2334 alen = sizeof(su->su_sin.sin_addr); 2335 af = 4; 2336 break; 2337 case AF_INET6: 2338 a = (u_char *) &su->su_sin6.sin6_addr; 2339 p = (u_char *) &su->su_sin6.sin6_port; 2340 alen = sizeof(su->su_sin6.sin6_addr); 2341 af = 6; 2342 break; 2343 default: 2344 af = 0; 2345 break; 2346 } 2347 if (af) { 2348 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2349 af, alen); 2350 for (i = 0; i < alen; i++) 2351 printf("%d,", UC(a[i])); 2352 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2353 } 2354 } 2355 2356 epsvonly:; 2357 /* EPRT/EPSV */ 2358 { 2359 int af; 2360 2361 switch (su->su_family) { 2362 case AF_INET: 2363 af = 1; 2364 break; 2365 case AF_INET6: 2366 af = 2; 2367 break; 2368 default: 2369 af = 0; 2370 break; 2371 } 2372 if (af) { 2373 union sockunion tmp; 2374 2375 tmp = *su; 2376 if (tmp.su_family == AF_INET6) 2377 tmp.su_sin6.sin6_scope_id = 0; 2378 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2379 hname, sizeof(hname) - 1, NULL, 0, 2380 NI_NUMERICHOST)) { 2381 hname[sizeof(hname) - 1] = 0; 2382 printf(" %s |%d|%s|%d|\r\n", 2383 ispassive ? "EPSV" : "EPRT", 2384 af, hname, htons(tmp.su_port)); 2385 } 2386 } 2387 } 2388 #undef UC 2389 } else 2390 printf(" No data connection\r\n"); 2391 reply(211, "End of status."); 2392 } 2393 2394 void 2395 fatalerror(char *s) 2396 { 2397 2398 reply(451, "Error in server: %s", s); 2399 reply(221, "Closing connection due to server error."); 2400 dologout(0); 2401 /* NOTREACHED */ 2402 } 2403 2404 void 2405 reply(int n, const char *fmt, ...) 2406 { 2407 va_list ap; 2408 2409 (void)printf("%d ", n); 2410 va_start(ap, fmt); 2411 (void)vprintf(fmt, ap); 2412 va_end(ap); 2413 (void)printf("\r\n"); 2414 (void)fflush(stdout); 2415 if (ftpdebug) { 2416 syslog(LOG_DEBUG, "<--- %d ", n); 2417 va_start(ap, fmt); 2418 vsyslog(LOG_DEBUG, fmt, ap); 2419 va_end(ap); 2420 } 2421 } 2422 2423 void 2424 lreply(int n, const char *fmt, ...) 2425 { 2426 va_list ap; 2427 2428 (void)printf("%d- ", n); 2429 va_start(ap, fmt); 2430 (void)vprintf(fmt, ap); 2431 va_end(ap); 2432 (void)printf("\r\n"); 2433 (void)fflush(stdout); 2434 if (ftpdebug) { 2435 syslog(LOG_DEBUG, "<--- %d- ", n); 2436 va_start(ap, fmt); 2437 vsyslog(LOG_DEBUG, fmt, ap); 2438 va_end(ap); 2439 } 2440 } 2441 2442 static void 2443 ack(char *s) 2444 { 2445 2446 reply(250, "%s command successful.", s); 2447 } 2448 2449 void 2450 nack(char *s) 2451 { 2452 2453 reply(502, "%s command not implemented.", s); 2454 } 2455 2456 /* ARGSUSED */ 2457 void 2458 yyerror(char *s) 2459 { 2460 char *cp; 2461 2462 if ((cp = strchr(cbuf,'\n'))) 2463 *cp = '\0'; 2464 reply(500, "%s: command not understood.", cbuf); 2465 } 2466 2467 void 2468 delete(char *name) 2469 { 2470 struct stat st; 2471 2472 LOGCMD("delete", name); 2473 if (lstat(name, &st) < 0) { 2474 perror_reply(550, name); 2475 return; 2476 } 2477 if (S_ISDIR(st.st_mode)) { 2478 if (rmdir(name) < 0) { 2479 perror_reply(550, name); 2480 return; 2481 } 2482 goto done; 2483 } 2484 if (guest && noguestmod) { 2485 reply(550, "Operation not permitted."); 2486 return; 2487 } 2488 if (unlink(name) < 0) { 2489 perror_reply(550, name); 2490 return; 2491 } 2492 done: 2493 ack("DELE"); 2494 } 2495 2496 void 2497 cwd(char *path) 2498 { 2499 2500 if (chdir(path) < 0) 2501 perror_reply(550, path); 2502 else 2503 ack("CWD"); 2504 } 2505 2506 void 2507 makedir(char *name) 2508 { 2509 char *s; 2510 2511 LOGCMD("mkdir", name); 2512 if (guest && noguestmkd) 2513 reply(550, "Operation not permitted."); 2514 else if (mkdir(name, 0777) < 0) 2515 perror_reply(550, name); 2516 else { 2517 if ((s = doublequote(name)) == NULL) 2518 fatalerror("Ran out of memory."); 2519 reply(257, "\"%s\" directory created.", s); 2520 free(s); 2521 } 2522 } 2523 2524 void 2525 removedir(char *name) 2526 { 2527 2528 LOGCMD("rmdir", name); 2529 if (rmdir(name) < 0) 2530 perror_reply(550, name); 2531 else 2532 ack("RMD"); 2533 } 2534 2535 void 2536 pwd(void) 2537 { 2538 char *s, path[MAXPATHLEN + 1]; 2539 2540 if (getcwd(path, sizeof(path)) == NULL) 2541 perror_reply(550, "Get current directory"); 2542 else { 2543 if ((s = doublequote(path)) == NULL) 2544 fatalerror("Ran out of memory."); 2545 reply(257, "\"%s\" is current directory.", s); 2546 free(s); 2547 } 2548 } 2549 2550 char * 2551 renamefrom(char *name) 2552 { 2553 struct stat st; 2554 2555 if (guest && noguestmod) { 2556 reply(550, "Operation not permitted."); 2557 return (NULL); 2558 } 2559 if (lstat(name, &st) < 0) { 2560 perror_reply(550, name); 2561 return (NULL); 2562 } 2563 reply(350, "File exists, ready for destination name."); 2564 return (name); 2565 } 2566 2567 void 2568 renamecmd(char *from, char *to) 2569 { 2570 struct stat st; 2571 2572 LOGCMD2("rename", from, to); 2573 2574 if (guest && (stat(to, &st) == 0)) { 2575 reply(550, "%s: permission denied.", to); 2576 return; 2577 } 2578 2579 if (rename(from, to) < 0) 2580 perror_reply(550, "rename"); 2581 else 2582 ack("RNTO"); 2583 } 2584 2585 static void 2586 dolog(struct sockaddr *who) 2587 { 2588 char who_name[NI_MAXHOST]; 2589 2590 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2591 remotehost[sizeof(remotehost) - 1] = 0; 2592 if (getnameinfo(who, who->sa_len, 2593 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2594 *who_name = 0; 2595 who_name[sizeof(who_name) - 1] = 0; 2596 2597 #ifdef SETPROCTITLE 2598 #ifdef VIRTUAL_HOSTING 2599 if (thishost != firsthost) 2600 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2601 remotehost, hostname); 2602 else 2603 #endif 2604 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2605 remotehost); 2606 setproctitle("%s", proctitle); 2607 #endif /* SETPROCTITLE */ 2608 2609 if (logging) { 2610 #ifdef VIRTUAL_HOSTING 2611 if (thishost != firsthost) 2612 syslog(LOG_INFO, "connection from %s (%s) to %s", 2613 remotehost, who_name, hostname); 2614 else 2615 #endif 2616 syslog(LOG_INFO, "connection from %s (%s)", 2617 remotehost, who_name); 2618 } 2619 } 2620 2621 /* 2622 * Record logout in wtmp file 2623 * and exit with supplied status. 2624 */ 2625 void 2626 dologout(int status) 2627 { 2628 /* 2629 * Prevent reception of SIGURG from resulting in a resumption 2630 * back to the main program loop. 2631 */ 2632 transflag = 0; 2633 2634 if (logged_in && dowtmp) { 2635 (void) seteuid(0); 2636 ftpd_logwtmp(ttyline, "", NULL); 2637 } 2638 /* beware of flushing buffers after a SIGPIPE */ 2639 _exit(status); 2640 } 2641 2642 static void 2643 sigurg(int signo) 2644 { 2645 2646 recvurg = 1; 2647 } 2648 2649 static void 2650 myoob(void) 2651 { 2652 char *cp; 2653 2654 /* only process if transfer occurring */ 2655 if (!transflag) 2656 return; 2657 cp = tmpline; 2658 if (getline(cp, 7, stdin) == NULL) { 2659 reply(221, "You could at least say goodbye."); 2660 dologout(0); 2661 } 2662 upper(cp); 2663 if (strcmp(cp, "ABOR\r\n") == 0) { 2664 tmpline[0] = '\0'; 2665 reply(426, "Transfer aborted. Data connection closed."); 2666 reply(226, "Abort successful."); 2667 } 2668 if (strcmp(cp, "STAT\r\n") == 0) { 2669 tmpline[0] = '\0'; 2670 if (file_size != -1) 2671 reply(213, "Status: %jd of %jd bytes transferred.", 2672 (intmax_t)byte_count, (intmax_t)file_size); 2673 else 2674 reply(213, "Status: %jd bytes transferred.", 2675 (intmax_t)byte_count); 2676 } 2677 } 2678 2679 /* 2680 * Note: a response of 425 is not mentioned as a possible response to 2681 * the PASV command in RFC959. However, it has been blessed as 2682 * a legitimate response by Jon Postel in a telephone conversation 2683 * with Rick Adams on 25 Jan 89. 2684 */ 2685 void 2686 passive(void) 2687 { 2688 int len, on; 2689 char *p, *a; 2690 2691 if (pdata >= 0) /* close old port if one set */ 2692 close(pdata); 2693 2694 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2695 if (pdata < 0) { 2696 perror_reply(425, "Can't open passive connection"); 2697 return; 2698 } 2699 on = 1; 2700 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2701 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2702 2703 (void) seteuid(0); 2704 2705 #ifdef IP_PORTRANGE 2706 if (ctrl_addr.su_family == AF_INET) { 2707 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2708 : IP_PORTRANGE_DEFAULT; 2709 2710 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2711 &on, sizeof(on)) < 0) 2712 goto pasv_error; 2713 } 2714 #endif 2715 #ifdef IPV6_PORTRANGE 2716 if (ctrl_addr.su_family == AF_INET6) { 2717 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2718 : IPV6_PORTRANGE_DEFAULT; 2719 2720 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2721 &on, sizeof(on)) < 0) 2722 goto pasv_error; 2723 } 2724 #endif 2725 2726 pasv_addr = ctrl_addr; 2727 pasv_addr.su_port = 0; 2728 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2729 goto pasv_error; 2730 2731 (void) seteuid(pw->pw_uid); 2732 2733 len = sizeof(pasv_addr); 2734 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2735 goto pasv_error; 2736 if (listen(pdata, 1) < 0) 2737 goto pasv_error; 2738 if (pasv_addr.su_family == AF_INET) 2739 a = (char *) &pasv_addr.su_sin.sin_addr; 2740 else if (pasv_addr.su_family == AF_INET6 && 2741 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2742 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2743 else 2744 goto pasv_error; 2745 2746 p = (char *) &pasv_addr.su_port; 2747 2748 #define UC(b) (((int) b) & 0xff) 2749 2750 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2751 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2752 return; 2753 2754 pasv_error: 2755 (void) seteuid(pw->pw_uid); 2756 (void) close(pdata); 2757 pdata = -1; 2758 perror_reply(425, "Can't open passive connection"); 2759 return; 2760 } 2761 2762 /* 2763 * Long Passive defined in RFC 1639. 2764 * 228 Entering Long Passive Mode 2765 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2766 */ 2767 2768 void 2769 long_passive(char *cmd, int pf) 2770 { 2771 int len, on; 2772 char *p, *a; 2773 2774 if (pdata >= 0) /* close old port if one set */ 2775 close(pdata); 2776 2777 if (pf != PF_UNSPEC) { 2778 if (ctrl_addr.su_family != pf) { 2779 switch (ctrl_addr.su_family) { 2780 case AF_INET: 2781 pf = 1; 2782 break; 2783 case AF_INET6: 2784 pf = 2; 2785 break; 2786 default: 2787 pf = 0; 2788 break; 2789 } 2790 /* 2791 * XXX 2792 * only EPRT/EPSV ready clients will understand this 2793 */ 2794 if (strcmp(cmd, "EPSV") == 0 && pf) { 2795 reply(522, "Network protocol mismatch, " 2796 "use (%d)", pf); 2797 } else 2798 reply(501, "Network protocol mismatch."); /*XXX*/ 2799 2800 return; 2801 } 2802 } 2803 2804 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2805 if (pdata < 0) { 2806 perror_reply(425, "Can't open passive connection"); 2807 return; 2808 } 2809 on = 1; 2810 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2811 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2812 2813 (void) seteuid(0); 2814 2815 pasv_addr = ctrl_addr; 2816 pasv_addr.su_port = 0; 2817 len = pasv_addr.su_len; 2818 2819 #ifdef IP_PORTRANGE 2820 if (ctrl_addr.su_family == AF_INET) { 2821 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2822 : IP_PORTRANGE_DEFAULT; 2823 2824 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2825 &on, sizeof(on)) < 0) 2826 goto pasv_error; 2827 } 2828 #endif 2829 #ifdef IPV6_PORTRANGE 2830 if (ctrl_addr.su_family == AF_INET6) { 2831 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2832 : IPV6_PORTRANGE_DEFAULT; 2833 2834 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2835 &on, sizeof(on)) < 0) 2836 goto pasv_error; 2837 } 2838 #endif 2839 2840 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2841 goto pasv_error; 2842 2843 (void) seteuid(pw->pw_uid); 2844 2845 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2846 goto pasv_error; 2847 if (listen(pdata, 1) < 0) 2848 goto pasv_error; 2849 2850 #define UC(b) (((int) b) & 0xff) 2851 2852 if (strcmp(cmd, "LPSV") == 0) { 2853 p = (char *)&pasv_addr.su_port; 2854 switch (pasv_addr.su_family) { 2855 case AF_INET: 2856 a = (char *) &pasv_addr.su_sin.sin_addr; 2857 v4_reply: 2858 reply(228, 2859 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2860 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2861 2, UC(p[0]), UC(p[1])); 2862 return; 2863 case AF_INET6: 2864 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2865 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2866 goto v4_reply; 2867 } 2868 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2869 reply(228, 2870 "Entering Long Passive Mode " 2871 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2872 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2873 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2874 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2875 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2876 2, UC(p[0]), UC(p[1])); 2877 return; 2878 } 2879 } else if (strcmp(cmd, "EPSV") == 0) { 2880 switch (pasv_addr.su_family) { 2881 case AF_INET: 2882 case AF_INET6: 2883 reply(229, "Entering Extended Passive Mode (|||%d|)", 2884 ntohs(pasv_addr.su_port)); 2885 return; 2886 } 2887 } else { 2888 /* more proper error code? */ 2889 } 2890 2891 pasv_error: 2892 (void) seteuid(pw->pw_uid); 2893 (void) close(pdata); 2894 pdata = -1; 2895 perror_reply(425, "Can't open passive connection"); 2896 return; 2897 } 2898 2899 /* 2900 * Generate unique name for file with basename "local" 2901 * and open the file in order to avoid possible races. 2902 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2903 * Return descriptor to the file, set "name" to its name. 2904 * 2905 * Generates failure reply on error. 2906 */ 2907 static int 2908 guniquefd(char *local, char **name) 2909 { 2910 static char new[MAXPATHLEN]; 2911 struct stat st; 2912 char *cp; 2913 int count; 2914 int fd; 2915 2916 cp = strrchr(local, '/'); 2917 if (cp) 2918 *cp = '\0'; 2919 if (stat(cp ? local : ".", &st) < 0) { 2920 perror_reply(553, cp ? local : "."); 2921 return (-1); 2922 } 2923 if (cp) { 2924 /* 2925 * Let not overwrite dirname with counter suffix. 2926 * -4 is for /nn\0 2927 * In this extreme case dot won't be put in front of suffix. 2928 */ 2929 if (strlen(local) > sizeof(new) - 4) { 2930 reply(553, "Pathname too long."); 2931 return (-1); 2932 } 2933 *cp = '/'; 2934 } 2935 /* -4 is for the .nn<null> we put on the end below */ 2936 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2937 cp = new + strlen(new); 2938 /* 2939 * Don't generate dotfile unless requested explicitly. 2940 * This covers the case when basename gets truncated off 2941 * by buffer size. 2942 */ 2943 if (cp > new && cp[-1] != '/') 2944 *cp++ = '.'; 2945 for (count = 0; count < 100; count++) { 2946 /* At count 0 try unmodified name */ 2947 if (count) 2948 (void)sprintf(cp, "%d", count); 2949 if ((fd = open(count ? new : local, 2950 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2951 *name = count ? new : local; 2952 return (fd); 2953 } 2954 if (errno != EEXIST) { 2955 perror_reply(553, count ? new : local); 2956 return (-1); 2957 } 2958 } 2959 reply(452, "Unique file name cannot be created."); 2960 return (-1); 2961 } 2962 2963 /* 2964 * Format and send reply containing system error number. 2965 */ 2966 void 2967 perror_reply(int code, char *string) 2968 { 2969 2970 reply(code, "%s: %s.", string, strerror(errno)); 2971 } 2972 2973 static char *onefile[] = { 2974 "", 2975 0 2976 }; 2977 2978 void 2979 send_file_list(char *whichf) 2980 { 2981 struct stat st; 2982 DIR *dirp = NULL; 2983 struct dirent *dir; 2984 FILE *dout = NULL; 2985 char **dirlist, *dirname; 2986 int simple = 0; 2987 int freeglob = 0; 2988 glob_t gl; 2989 2990 if (strpbrk(whichf, "~{[*?") != NULL) { 2991 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2992 2993 memset(&gl, 0, sizeof(gl)); 2994 gl.gl_matchc = MAXGLOBARGS; 2995 flags |= GLOB_LIMIT; 2996 freeglob = 1; 2997 if (glob(whichf, flags, 0, &gl)) { 2998 reply(550, "No matching files found."); 2999 goto out; 3000 } else if (gl.gl_pathc == 0) { 3001 errno = ENOENT; 3002 perror_reply(550, whichf); 3003 goto out; 3004 } 3005 dirlist = gl.gl_pathv; 3006 } else { 3007 onefile[0] = whichf; 3008 dirlist = onefile; 3009 simple = 1; 3010 } 3011 3012 while ((dirname = *dirlist++)) { 3013 if (stat(dirname, &st) < 0) { 3014 /* 3015 * If user typed "ls -l", etc, and the client 3016 * used NLST, do what the user meant. 3017 */ 3018 if (dirname[0] == '-' && *dirlist == NULL && 3019 transflag == 0) { 3020 retrieve(_PATH_LS " %s", dirname); 3021 goto out; 3022 } 3023 perror_reply(550, whichf); 3024 if (dout != NULL) { 3025 (void) fclose(dout); 3026 transflag = 0; 3027 data = -1; 3028 pdata = -1; 3029 } 3030 goto out; 3031 } 3032 3033 if (S_ISREG(st.st_mode)) { 3034 if (dout == NULL) { 3035 dout = dataconn("file list", -1, "w"); 3036 if (dout == NULL) 3037 goto out; 3038 transflag++; 3039 } 3040 fprintf(dout, "%s%s\n", dirname, 3041 type == TYPE_A ? "\r" : ""); 3042 byte_count += strlen(dirname) + 1; 3043 continue; 3044 } else if (!S_ISDIR(st.st_mode)) 3045 continue; 3046 3047 if ((dirp = opendir(dirname)) == NULL) 3048 continue; 3049 3050 while ((dir = readdir(dirp)) != NULL) { 3051 char nbuf[MAXPATHLEN]; 3052 3053 if (recvurg) { 3054 myoob(); 3055 recvurg = 0; 3056 transflag = 0; 3057 goto out; 3058 } 3059 3060 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3061 continue; 3062 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3063 dir->d_namlen == 2) 3064 continue; 3065 3066 snprintf(nbuf, sizeof(nbuf), 3067 "%s/%s", dirname, dir->d_name); 3068 3069 /* 3070 * We have to do a stat to insure it's 3071 * not a directory or special file. 3072 */ 3073 if (simple || (stat(nbuf, &st) == 0 && 3074 S_ISREG(st.st_mode))) { 3075 if (dout == NULL) { 3076 dout = dataconn("file list", -1, "w"); 3077 if (dout == NULL) 3078 goto out; 3079 transflag++; 3080 } 3081 if (nbuf[0] == '.' && nbuf[1] == '/') 3082 fprintf(dout, "%s%s\n", &nbuf[2], 3083 type == TYPE_A ? "\r" : ""); 3084 else 3085 fprintf(dout, "%s%s\n", nbuf, 3086 type == TYPE_A ? "\r" : ""); 3087 byte_count += strlen(nbuf) + 1; 3088 } 3089 } 3090 (void) closedir(dirp); 3091 } 3092 3093 if (dout == NULL) 3094 reply(550, "No files found."); 3095 else if (ferror(dout) != 0) 3096 perror_reply(550, "Data connection"); 3097 else 3098 reply(226, "Transfer complete."); 3099 3100 transflag = 0; 3101 if (dout != NULL) 3102 (void) fclose(dout); 3103 data = -1; 3104 pdata = -1; 3105 out: 3106 if (freeglob) { 3107 freeglob = 0; 3108 globfree(&gl); 3109 } 3110 } 3111 3112 void 3113 reapchild(int signo) 3114 { 3115 while (waitpid(-1, NULL, WNOHANG) > 0); 3116 } 3117 3118 #ifdef OLD_SETPROCTITLE 3119 /* 3120 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3121 * Warning, since this is usually started from inetd.conf, it often doesn't 3122 * have much of an environment or arglist to overwrite. 3123 */ 3124 void 3125 setproctitle(const char *fmt, ...) 3126 { 3127 int i; 3128 va_list ap; 3129 char *p, *bp, ch; 3130 char buf[LINE_MAX]; 3131 3132 va_start(ap, fmt); 3133 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3134 3135 /* make ps print our process name */ 3136 p = Argv[0]; 3137 *p++ = '-'; 3138 3139 i = strlen(buf); 3140 if (i > LastArgv - p - 2) { 3141 i = LastArgv - p - 2; 3142 buf[i] = '\0'; 3143 } 3144 bp = buf; 3145 while (ch = *bp++) 3146 if (ch != '\n' && ch != '\r') 3147 *p++ = ch; 3148 while (p < LastArgv) 3149 *p++ = ' '; 3150 } 3151 #endif /* OLD_SETPROCTITLE */ 3152 3153 static void 3154 appendf(char **strp, char *fmt, ...) 3155 { 3156 va_list ap; 3157 char *ostr, *p; 3158 3159 va_start(ap, fmt); 3160 vasprintf(&p, fmt, ap); 3161 va_end(ap); 3162 if (p == NULL) 3163 fatalerror("Ran out of memory."); 3164 if (*strp == NULL) 3165 *strp = p; 3166 else { 3167 ostr = *strp; 3168 asprintf(strp, "%s%s", ostr, p); 3169 if (*strp == NULL) 3170 fatalerror("Ran out of memory."); 3171 free(ostr); 3172 } 3173 } 3174 3175 static void 3176 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3177 { 3178 char *msg = NULL; 3179 char wd[MAXPATHLEN + 1]; 3180 3181 if (logging <= 1) 3182 return; 3183 3184 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3185 strcpy(wd, strerror(errno)); 3186 3187 appendf(&msg, "%s", cmd); 3188 if (file1) 3189 appendf(&msg, " %s", file1); 3190 if (file2) 3191 appendf(&msg, " %s", file2); 3192 if (cnt >= 0) 3193 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3194 appendf(&msg, " (wd: %s", wd); 3195 if (guest || dochroot) 3196 appendf(&msg, "; chrooted"); 3197 appendf(&msg, ")"); 3198 syslog(LOG_INFO, "%s", msg); 3199 free(msg); 3200 } 3201 3202 static void 3203 logxfer(char *name, off_t size, time_t start) 3204 { 3205 char buf[MAXPATHLEN + 1024]; 3206 char path[MAXPATHLEN + 1]; 3207 time_t now; 3208 3209 if (statfd >= 0) { 3210 time(&now); 3211 if (realpath(name, path) == NULL) { 3212 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3213 return; 3214 } 3215 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3216 ctime(&now)+4, ident, remotehost, 3217 path, (intmax_t)size, 3218 (long)(now - start + (now == start))); 3219 write(statfd, buf, strlen(buf)); 3220 } 3221 } 3222 3223 static char * 3224 doublequote(char *s) 3225 { 3226 int n; 3227 char *p, *s2; 3228 3229 for (p = s, n = 0; *p; p++) 3230 if (*p == '"') 3231 n++; 3232 3233 if ((s2 = malloc(p - s + n + 1)) == NULL) 3234 return (NULL); 3235 3236 for (p = s2; *s; s++, p++) { 3237 if ((*p = *s) == '"') 3238 *(++p) = '"'; 3239 } 3240 *p = '\0'; 3241 3242 return (s2); 3243 } 3244 3245 /* setup server socket for specified address family */ 3246 /* if af is PF_UNSPEC more than one socket may be returned */ 3247 /* the returned list is dynamically allocated, so caller needs to free it */ 3248 static int * 3249 socksetup(int af, char *bindname, const char *bindport) 3250 { 3251 struct addrinfo hints, *res, *r; 3252 int error, maxs, *s, *socks; 3253 const int on = 1; 3254 3255 memset(&hints, 0, sizeof(hints)); 3256 hints.ai_flags = AI_PASSIVE; 3257 hints.ai_family = af; 3258 hints.ai_socktype = SOCK_STREAM; 3259 error = getaddrinfo(bindname, bindport, &hints, &res); 3260 if (error) { 3261 syslog(LOG_ERR, "%s", gai_strerror(error)); 3262 if (error == EAI_SYSTEM) 3263 syslog(LOG_ERR, "%s", strerror(errno)); 3264 return NULL; 3265 } 3266 3267 /* Count max number of sockets we may open */ 3268 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3269 ; 3270 socks = malloc((maxs + 1) * sizeof(int)); 3271 if (!socks) { 3272 freeaddrinfo(res); 3273 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3274 return NULL; 3275 } 3276 3277 *socks = 0; /* num of sockets counter at start of array */ 3278 s = socks + 1; 3279 for (r = res; r; r = r->ai_next) { 3280 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3281 if (*s < 0) { 3282 syslog(LOG_DEBUG, "control socket: %m"); 3283 continue; 3284 } 3285 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3286 &on, sizeof(on)) < 0) 3287 syslog(LOG_WARNING, 3288 "control setsockopt (SO_REUSEADDR): %m"); 3289 if (r->ai_family == AF_INET6) { 3290 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3291 &on, sizeof(on)) < 0) 3292 syslog(LOG_WARNING, 3293 "control setsockopt (IPV6_V6ONLY): %m"); 3294 } 3295 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3296 syslog(LOG_DEBUG, "control bind: %m"); 3297 close(*s); 3298 continue; 3299 } 3300 (*socks)++; 3301 s++; 3302 } 3303 3304 if (res) 3305 freeaddrinfo(res); 3306 3307 if (*socks == 0) { 3308 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3309 free(socks); 3310 return NULL; 3311 } 3312 return(socks); 3313 } 3314