1 /* 2 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if 0 35 #ifndef lint 36 static char copyright[] = 37 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #endif /* not lint */ 40 #endif 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 45 #endif 46 #endif /* not lint */ 47 48 #include <sys/cdefs.h> 49 __FBSDID("$FreeBSD$"); 50 51 /* 52 * FTP server. 53 */ 54 #include <sys/param.h> 55 #include <sys/ioctl.h> 56 #include <sys/mman.h> 57 #include <sys/socket.h> 58 #include <sys/stat.h> 59 #include <sys/time.h> 60 #include <sys/wait.h> 61 62 #include <netinet/in.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/ip.h> 65 #include <netinet/tcp.h> 66 67 #define FTP_NAMES 68 #include <arpa/ftp.h> 69 #include <arpa/inet.h> 70 #include <arpa/telnet.h> 71 72 #include <ctype.h> 73 #include <dirent.h> 74 #include <err.h> 75 #include <errno.h> 76 #include <fcntl.h> 77 #include <glob.h> 78 #include <limits.h> 79 #include <netdb.h> 80 #include <pwd.h> 81 #include <grp.h> 82 #include <opie.h> 83 #include <signal.h> 84 #include <stdint.h> 85 #include <stdio.h> 86 #include <stdlib.h> 87 #include <string.h> 88 #include <syslog.h> 89 #include <time.h> 90 #include <unistd.h> 91 #include <libutil.h> 92 #ifdef LOGIN_CAP 93 #include <login_cap.h> 94 #endif 95 96 #ifdef USE_PAM 97 #include <security/pam_appl.h> 98 #endif 99 100 #include "pathnames.h" 101 #include "extern.h" 102 103 #include <stdarg.h> 104 105 static char version[] = "Version 6.00LS"; 106 #undef main 107 108 extern off_t restart_point; 109 extern char cbuf[]; 110 111 union sockunion ctrl_addr; 112 union sockunion data_source; 113 union sockunion data_dest; 114 union sockunion his_addr; 115 union sockunion pasv_addr; 116 117 int daemon_mode; 118 int data; 119 int dataport; 120 int hostinfo = 1; /* print host-specific info in messages */ 121 int logged_in; 122 struct passwd *pw; 123 char *homedir; 124 int ftpdebug; 125 int timeout = 900; /* timeout after 15 minutes of inactivity */ 126 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 127 int logging; 128 int restricted_data_ports = 1; 129 int paranoid = 1; /* be extra careful about security */ 130 int anon_only = 0; /* Only anonymous ftp allowed */ 131 int guest; 132 int dochroot; 133 char *chrootdir; 134 int dowtmp = 1; 135 int stats; 136 int statfd = -1; 137 int type; 138 int form; 139 int stru; /* avoid C keyword */ 140 int mode; 141 int usedefault = 1; /* for data transfers */ 142 int pdata = -1; /* for passive mode */ 143 int readonly = 0; /* Server is in readonly mode. */ 144 int noepsv = 0; /* EPSV command is disabled. */ 145 int noretr = 0; /* RETR command is disabled. */ 146 int noguestretr = 0; /* RETR command is disabled for anon users. */ 147 int noguestmkd = 0; /* MKD command is disabled for anon users. */ 148 int noguestmod = 1; /* anon users may not modify existing files. */ 149 150 off_t file_size; 151 off_t byte_count; 152 #if !defined(CMASK) || CMASK == 0 153 #undef CMASK 154 #define CMASK 027 155 #endif 156 int defumask = CMASK; /* default umask value */ 157 char tmpline[7]; 158 char *hostname; 159 int epsvall = 0; 160 161 #ifdef VIRTUAL_HOSTING 162 char *ftpuser; 163 164 static struct ftphost { 165 struct ftphost *next; 166 struct addrinfo *hostinfo; 167 char *hostname; 168 char *anonuser; 169 char *statfile; 170 char *welcome; 171 char *loginmsg; 172 } *thishost, *firsthost; 173 174 #endif 175 char remotehost[NI_MAXHOST]; 176 char *ident = NULL; 177 178 static char ttyline[20]; 179 char *tty = ttyline; /* for klogin */ 180 181 #ifdef USE_PAM 182 static int auth_pam(struct passwd**, const char*); 183 pam_handle_t *pamh = NULL; 184 #endif 185 186 static struct opie opiedata; 187 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 188 static int pwok; 189 190 char *pid_file = NULL; 191 192 /* 193 * Limit number of pathnames that glob can return. 194 * A limit of 0 indicates the number of pathnames is unlimited. 195 */ 196 #define MAXGLOBARGS 16384 197 # 198 199 /* 200 * Timeout intervals for retrying connections 201 * to hosts that don't accept PORT cmds. This 202 * is a kludge, but given the problems with TCP... 203 */ 204 #define SWAITMAX 90 /* wait at most 90 seconds */ 205 #define SWAITINT 5 /* interval between retries */ 206 207 int swaitmax = SWAITMAX; 208 int swaitint = SWAITINT; 209 210 #ifdef SETPROCTITLE 211 #ifdef OLD_SETPROCTITLE 212 char **Argv = NULL; /* pointer to argument vector */ 213 char *LastArgv = NULL; /* end of argv */ 214 #endif /* OLD_SETPROCTITLE */ 215 char proctitle[LINE_MAX]; /* initial part of title */ 216 #endif /* SETPROCTITLE */ 217 218 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 219 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 220 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 221 222 static volatile sig_atomic_t recvurg; 223 static int transflag; /* NB: for debugging only */ 224 225 #define STARTXFER flagxfer(1) 226 #define ENDXFER flagxfer(0) 227 228 #define START_UNSAFE maskurg(1) 229 #define END_UNSAFE maskurg(0) 230 231 /* It's OK to put an `else' clause after this macro. */ 232 #define CHECKOOB(action) \ 233 if (recvurg) { \ 234 recvurg = 0; \ 235 if (myoob()) { \ 236 ENDXFER; \ 237 action; \ 238 } \ 239 } 240 241 #ifdef VIRTUAL_HOSTING 242 static void inithosts(void); 243 static void selecthost(union sockunion *); 244 #endif 245 static void ack(char *); 246 static void sigurg(int); 247 static void maskurg(int); 248 static void flagxfer(int); 249 static int myoob(void); 250 static int checkuser(char *, char *, int, char **); 251 static FILE *dataconn(char *, off_t, char *); 252 static void dolog(struct sockaddr *); 253 static void end_login(void); 254 static FILE *getdatasock(char *); 255 static int guniquefd(char *, char **); 256 static void lostconn(int); 257 static void sigquit(int); 258 static int receive_data(FILE *, FILE *); 259 static int send_data(FILE *, FILE *, size_t, off_t, int); 260 static struct passwd * 261 sgetpwnam(char *); 262 static char *sgetsave(char *); 263 static void reapchild(int); 264 static void appendf(char **, char *, ...) __printflike(2, 3); 265 static void logcmd(char *, char *, char *, off_t); 266 static void logxfer(char *, off_t, time_t); 267 static char *doublequote(char *); 268 static int *socksetup(int, char *, const char *); 269 270 int 271 main(int argc, char *argv[], char **envp) 272 { 273 int addrlen, ch, on = 1, tos; 274 char *cp, line[LINE_MAX]; 275 FILE *fd; 276 char *bindname = NULL; 277 const char *bindport = "ftp"; 278 int family = AF_UNSPEC; 279 struct sigaction sa; 280 281 tzset(); /* in case no timezone database in ~ftp */ 282 sigemptyset(&sa.sa_mask); 283 sa.sa_flags = SA_RESTART; 284 285 #ifdef OLD_SETPROCTITLE 286 /* 287 * Save start and extent of argv for setproctitle. 288 */ 289 Argv = argv; 290 while (*envp) 291 envp++; 292 LastArgv = envp[-1] + strlen(envp[-1]); 293 #endif /* OLD_SETPROCTITLE */ 294 295 /* 296 * Prevent diagnostic messages from appearing on stderr. 297 * We run as a daemon or from inetd; in both cases, there's 298 * more reason in logging to syslog. 299 */ 300 (void) freopen(_PATH_DEVNULL, "w", stderr); 301 opterr = 0; 302 303 /* 304 * LOG_NDELAY sets up the logging connection immediately, 305 * necessary for anonymous ftp's that chroot and can't do it later. 306 */ 307 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 308 309 while ((ch = getopt(argc, argv, 310 "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 311 switch (ch) { 312 case '4': 313 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 314 break; 315 316 case '6': 317 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 318 break; 319 320 case 'a': 321 bindname = optarg; 322 break; 323 324 case 'A': 325 anon_only = 1; 326 break; 327 328 case 'd': 329 ftpdebug++; 330 break; 331 332 case 'D': 333 daemon_mode++; 334 break; 335 336 case 'E': 337 noepsv = 1; 338 break; 339 340 case 'h': 341 hostinfo = 0; 342 break; 343 344 case 'l': 345 logging++; /* > 1 == extra logging */ 346 break; 347 348 case 'm': 349 noguestmod = 0; 350 break; 351 352 case 'M': 353 noguestmkd = 1; 354 break; 355 356 case 'o': 357 noretr = 1; 358 break; 359 360 case 'O': 361 noguestretr = 1; 362 break; 363 364 case 'p': 365 pid_file = optarg; 366 break; 367 368 case 'P': 369 bindport = optarg; 370 break; 371 372 case 'r': 373 readonly = 1; 374 break; 375 376 case 'R': 377 paranoid = 0; 378 break; 379 380 case 'S': 381 stats++; 382 break; 383 384 case 't': 385 timeout = atoi(optarg); 386 if (maxtimeout < timeout) 387 maxtimeout = timeout; 388 break; 389 390 case 'T': 391 maxtimeout = atoi(optarg); 392 if (timeout > maxtimeout) 393 timeout = maxtimeout; 394 break; 395 396 case 'u': 397 { 398 long val = 0; 399 400 val = strtol(optarg, &optarg, 8); 401 if (*optarg != '\0' || val < 0) 402 syslog(LOG_WARNING, "bad value for -u"); 403 else 404 defumask = val; 405 break; 406 } 407 case 'U': 408 restricted_data_ports = 0; 409 break; 410 411 case 'v': 412 ftpdebug++; 413 break; 414 415 case 'W': 416 dowtmp = 0; 417 break; 418 419 default: 420 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 421 break; 422 } 423 } 424 425 #ifdef VIRTUAL_HOSTING 426 inithosts(); 427 #endif 428 429 if (daemon_mode) { 430 int *ctl_sock, fd, maxfd = -1, nfds, i; 431 fd_set defreadfds, readfds; 432 pid_t pid; 433 434 /* 435 * Detach from parent. 436 */ 437 if (daemon(1, 1) < 0) { 438 syslog(LOG_ERR, "failed to become a daemon"); 439 exit(1); 440 } 441 sa.sa_handler = reapchild; 442 (void)sigaction(SIGCHLD, &sa, NULL); 443 444 /* 445 * Open a socket, bind it to the FTP port, and start 446 * listening. 447 */ 448 ctl_sock = socksetup(family, bindname, bindport); 449 if (ctl_sock == NULL) 450 exit(1); 451 452 FD_ZERO(&defreadfds); 453 for (i = 1; i <= *ctl_sock; i++) { 454 FD_SET(ctl_sock[i], &defreadfds); 455 if (listen(ctl_sock[i], 32) < 0) { 456 syslog(LOG_ERR, "control listen: %m"); 457 exit(1); 458 } 459 if (maxfd < ctl_sock[i]) 460 maxfd = ctl_sock[i]; 461 } 462 463 /* 464 * Atomically write process ID 465 */ 466 if (pid_file) 467 { 468 int fd; 469 char buf[20]; 470 471 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 472 | O_NONBLOCK | O_EXLOCK, 0644); 473 if (fd < 0) { 474 if (errno == EAGAIN) 475 syslog(LOG_ERR, 476 "%s: already locked", pid_file); 477 else 478 syslog(LOG_ERR, "%s: %m", pid_file); 479 exit(1); 480 } 481 snprintf(buf, sizeof(buf), 482 "%lu\n", (unsigned long) getpid()); 483 if (write(fd, buf, strlen(buf)) < 0) { 484 syslog(LOG_ERR, "%s: write: %m", pid_file); 485 exit(1); 486 } 487 /* Leave the pid file open and locked */ 488 } 489 /* 490 * Loop forever accepting connection requests and forking off 491 * children to handle them. 492 */ 493 while (1) { 494 FD_COPY(&defreadfds, &readfds); 495 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 496 if (nfds <= 0) { 497 if (nfds < 0 && errno != EINTR) 498 syslog(LOG_WARNING, "select: %m"); 499 continue; 500 } 501 502 pid = -1; 503 for (i = 1; i <= *ctl_sock; i++) 504 if (FD_ISSET(ctl_sock[i], &readfds)) { 505 addrlen = sizeof(his_addr); 506 fd = accept(ctl_sock[i], 507 (struct sockaddr *)&his_addr, 508 &addrlen); 509 if (fd >= 0) { 510 if ((pid = fork()) == 0) { 511 /* child */ 512 (void) dup2(fd, 0); 513 (void) dup2(fd, 1); 514 close(ctl_sock[i]); 515 } else 516 close(fd); 517 } 518 } 519 if (pid == 0) 520 break; 521 } 522 } else { 523 addrlen = sizeof(his_addr); 524 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 525 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 526 exit(1); 527 } 528 } 529 530 sa.sa_handler = SIG_DFL; 531 (void)sigaction(SIGCHLD, &sa, NULL); 532 533 sa.sa_handler = sigurg; 534 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 535 (void)sigaction(SIGURG, &sa, NULL); 536 537 sigfillset(&sa.sa_mask); /* block all signals in handler */ 538 sa.sa_flags = SA_RESTART; 539 sa.sa_handler = sigquit; 540 (void)sigaction(SIGHUP, &sa, NULL); 541 (void)sigaction(SIGINT, &sa, NULL); 542 (void)sigaction(SIGQUIT, &sa, NULL); 543 (void)sigaction(SIGTERM, &sa, NULL); 544 545 sa.sa_handler = lostconn; 546 (void)sigaction(SIGPIPE, &sa, NULL); 547 548 addrlen = sizeof(ctrl_addr); 549 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 550 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 551 exit(1); 552 } 553 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 554 #ifdef VIRTUAL_HOSTING 555 /* select our identity from virtual host table */ 556 selecthost(&ctrl_addr); 557 #endif 558 #ifdef IP_TOS 559 if (ctrl_addr.su_family == AF_INET) 560 { 561 tos = IPTOS_LOWDELAY; 562 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 563 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 564 } 565 #endif 566 /* 567 * Disable Nagle on the control channel so that we don't have to wait 568 * for peer's ACK before issuing our next reply. 569 */ 570 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 571 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 572 573 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 574 575 /* set this here so klogin can use it... */ 576 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 577 578 /* Try to handle urgent data inline */ 579 #ifdef SO_OOBINLINE 580 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 581 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 582 #endif 583 584 #ifdef F_SETOWN 585 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 586 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 587 #endif 588 dolog((struct sockaddr *)&his_addr); 589 /* 590 * Set up default state 591 */ 592 data = -1; 593 type = TYPE_A; 594 form = FORM_N; 595 stru = STRU_F; 596 mode = MODE_S; 597 tmpline[0] = '\0'; 598 599 /* If logins are disabled, print out the message. */ 600 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 601 while (fgets(line, sizeof(line), fd) != NULL) { 602 if ((cp = strchr(line, '\n')) != NULL) 603 *cp = '\0'; 604 lreply(530, "%s", line); 605 } 606 (void) fflush(stdout); 607 (void) fclose(fd); 608 reply(530, "System not available."); 609 exit(0); 610 } 611 #ifdef VIRTUAL_HOSTING 612 fd = fopen(thishost->welcome, "r"); 613 #else 614 fd = fopen(_PATH_FTPWELCOME, "r"); 615 #endif 616 if (fd != NULL) { 617 while (fgets(line, sizeof(line), fd) != NULL) { 618 if ((cp = strchr(line, '\n')) != NULL) 619 *cp = '\0'; 620 lreply(220, "%s", line); 621 } 622 (void) fflush(stdout); 623 (void) fclose(fd); 624 /* reply(220,) must follow */ 625 } 626 #ifndef VIRTUAL_HOSTING 627 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 628 fatalerror("Ran out of memory."); 629 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 630 hostname[0] = '\0'; 631 hostname[MAXHOSTNAMELEN - 1] = '\0'; 632 #endif 633 if (hostinfo) 634 reply(220, "%s FTP server (%s) ready.", hostname, version); 635 else 636 reply(220, "FTP server ready."); 637 for (;;) 638 (void) yyparse(); 639 /* NOTREACHED */ 640 } 641 642 static void 643 lostconn(int signo) 644 { 645 646 if (ftpdebug) 647 syslog(LOG_DEBUG, "lost connection"); 648 dologout(1); 649 } 650 651 static void 652 sigquit(int signo) 653 { 654 655 syslog(LOG_ERR, "got signal %d", signo); 656 dologout(1); 657 } 658 659 #ifdef VIRTUAL_HOSTING 660 /* 661 * read in virtual host tables (if they exist) 662 */ 663 664 static void 665 inithosts(void) 666 { 667 int insert; 668 size_t len; 669 FILE *fp; 670 char *cp, *mp, *line; 671 char *hostname; 672 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 673 struct ftphost *hrp, *lhrp; 674 struct addrinfo hints, *res, *ai; 675 676 /* 677 * Fill in the default host information 678 */ 679 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 680 fatalerror("Ran out of memory."); 681 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 682 hostname[0] = '\0'; 683 hostname[MAXHOSTNAMELEN - 1] = '\0'; 684 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 685 fatalerror("Ran out of memory."); 686 hrp->hostname = hostname; 687 hrp->hostinfo = NULL; 688 689 memset(&hints, 0, sizeof(hints)); 690 hints.ai_flags = AI_CANONNAME; 691 hints.ai_family = AF_UNSPEC; 692 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 693 hrp->hostinfo = res; 694 hrp->statfile = _PATH_FTPDSTATFILE; 695 hrp->welcome = _PATH_FTPWELCOME; 696 hrp->loginmsg = _PATH_FTPLOGINMESG; 697 hrp->anonuser = "ftp"; 698 hrp->next = NULL; 699 thishost = firsthost = lhrp = hrp; 700 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 701 int addrsize, gothost; 702 void *addr; 703 struct hostent *hp; 704 705 while ((line = fgetln(fp, &len)) != NULL) { 706 int i, hp_error; 707 708 /* skip comments */ 709 if (line[0] == '#') 710 continue; 711 if (line[len - 1] == '\n') { 712 line[len - 1] = '\0'; 713 mp = NULL; 714 } else { 715 if ((mp = malloc(len + 1)) == NULL) 716 fatalerror("Ran out of memory."); 717 memcpy(mp, line, len); 718 mp[len] = '\0'; 719 line = mp; 720 } 721 cp = strtok(line, " \t"); 722 /* skip empty lines */ 723 if (cp == NULL) 724 goto nextline; 725 vhost = cp; 726 727 /* set defaults */ 728 anonuser = "ftp"; 729 statfile = _PATH_FTPDSTATFILE; 730 welcome = _PATH_FTPWELCOME; 731 loginmsg = _PATH_FTPLOGINMESG; 732 733 /* 734 * Preparse the line so we can use its info 735 * for all the addresses associated with 736 * the virtual host name. 737 * Field 0, the virtual host name, is special: 738 * it's already parsed off and will be strdup'ed 739 * later, after we know its canonical form. 740 */ 741 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 742 if (*cp != '-' && (cp = strdup(cp))) 743 switch (i) { 744 case 1: /* anon user permissions */ 745 anonuser = cp; 746 break; 747 case 2: /* statistics file */ 748 statfile = cp; 749 break; 750 case 3: /* welcome message */ 751 welcome = cp; 752 break; 753 case 4: /* login message */ 754 loginmsg = cp; 755 break; 756 default: /* programming error */ 757 abort(); 758 /* NOTREACHED */ 759 } 760 761 hints.ai_flags = 0; 762 hints.ai_family = AF_UNSPEC; 763 hints.ai_flags = AI_PASSIVE; 764 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 765 goto nextline; 766 for (ai = res; ai != NULL && ai->ai_addr != NULL; 767 ai = ai->ai_next) { 768 769 gothost = 0; 770 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 771 struct addrinfo *hi; 772 773 for (hi = hrp->hostinfo; hi != NULL; 774 hi = hi->ai_next) 775 if (hi->ai_addrlen == ai->ai_addrlen && 776 memcmp(hi->ai_addr, 777 ai->ai_addr, 778 ai->ai_addr->sa_len) == 0) { 779 gothost++; 780 break; 781 } 782 if (gothost) 783 break; 784 } 785 if (hrp == NULL) { 786 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 787 goto nextline; 788 hrp->hostname = NULL; 789 insert = 1; 790 } else { 791 if (hrp->hostinfo && hrp->hostinfo != res) 792 freeaddrinfo(hrp->hostinfo); 793 insert = 0; /* host already in the chain */ 794 } 795 hrp->hostinfo = res; 796 797 /* 798 * determine hostname to use. 799 * force defined name if there is a valid alias 800 * otherwise fallback to primary hostname 801 */ 802 /* XXX: getaddrinfo() can't do alias check */ 803 switch(hrp->hostinfo->ai_family) { 804 case AF_INET: 805 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 806 addrsize = sizeof(struct in_addr); 807 break; 808 case AF_INET6: 809 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 810 addrsize = sizeof(struct in6_addr); 811 break; 812 default: 813 /* should not reach here */ 814 freeaddrinfo(hrp->hostinfo); 815 if (insert) 816 free(hrp); /*not in chain, can free*/ 817 else 818 hrp->hostinfo = NULL; /*mark as blank*/ 819 goto nextline; 820 /* NOTREACHED */ 821 } 822 if ((hp = getipnodebyaddr(addr, addrsize, 823 hrp->hostinfo->ai_family, 824 &hp_error)) != NULL) { 825 if (strcmp(vhost, hp->h_name) != 0) { 826 if (hp->h_aliases == NULL) 827 vhost = hp->h_name; 828 else { 829 i = 0; 830 while (hp->h_aliases[i] && 831 strcmp(vhost, hp->h_aliases[i]) != 0) 832 ++i; 833 if (hp->h_aliases[i] == NULL) 834 vhost = hp->h_name; 835 } 836 } 837 } 838 if (hrp->hostname && 839 strcmp(hrp->hostname, vhost) != 0) { 840 free(hrp->hostname); 841 hrp->hostname = NULL; 842 } 843 if (hrp->hostname == NULL && 844 (hrp->hostname = strdup(vhost)) == NULL) { 845 freeaddrinfo(hrp->hostinfo); 846 hrp->hostinfo = NULL; /* mark as blank */ 847 if (hp) 848 freehostent(hp); 849 goto nextline; 850 } 851 hrp->anonuser = anonuser; 852 hrp->statfile = statfile; 853 hrp->welcome = welcome; 854 hrp->loginmsg = loginmsg; 855 if (insert) { 856 hrp->next = NULL; 857 lhrp->next = hrp; 858 lhrp = hrp; 859 } 860 if (hp) 861 freehostent(hp); 862 } 863 nextline: 864 if (mp) 865 free(mp); 866 } 867 (void) fclose(fp); 868 } 869 } 870 871 static void 872 selecthost(union sockunion *su) 873 { 874 struct ftphost *hrp; 875 u_int16_t port; 876 #ifdef INET6 877 struct in6_addr *mapped_in6 = NULL; 878 #endif 879 struct addrinfo *hi; 880 881 #ifdef INET6 882 /* 883 * XXX IPv4 mapped IPv6 addr consideraton, 884 * specified in rfc2373. 885 */ 886 if (su->su_family == AF_INET6 && 887 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 888 mapped_in6 = &su->su_sin6.sin6_addr; 889 #endif 890 891 hrp = thishost = firsthost; /* default */ 892 port = su->su_port; 893 su->su_port = 0; 894 while (hrp != NULL) { 895 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 896 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 897 thishost = hrp; 898 goto found; 899 } 900 #ifdef INET6 901 /* XXX IPv4 mapped IPv6 addr consideraton */ 902 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 903 (memcmp(&mapped_in6->s6_addr[12], 904 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 905 sizeof(struct in_addr)) == 0)) { 906 thishost = hrp; 907 goto found; 908 } 909 #endif 910 } 911 hrp = hrp->next; 912 } 913 found: 914 su->su_port = port; 915 /* setup static variables as appropriate */ 916 hostname = thishost->hostname; 917 ftpuser = thishost->anonuser; 918 } 919 #endif 920 921 /* 922 * Helper function for sgetpwnam(). 923 */ 924 static char * 925 sgetsave(char *s) 926 { 927 char *new = malloc(strlen(s) + 1); 928 929 if (new == NULL) { 930 reply(421, "Ran out of memory."); 931 dologout(1); 932 /* NOTREACHED */ 933 } 934 (void) strcpy(new, s); 935 return (new); 936 } 937 938 /* 939 * Save the result of a getpwnam. Used for USER command, since 940 * the data returned must not be clobbered by any other command 941 * (e.g., globbing). 942 * NB: The data returned by sgetpwnam() will remain valid until 943 * the next call to this function. Its difference from getpwnam() 944 * is that sgetpwnam() is known to be called from ftpd code only. 945 */ 946 static struct passwd * 947 sgetpwnam(char *name) 948 { 949 static struct passwd save; 950 struct passwd *p; 951 952 if ((p = getpwnam(name)) == NULL) 953 return (p); 954 if (save.pw_name) { 955 free(save.pw_name); 956 free(save.pw_passwd); 957 free(save.pw_gecos); 958 free(save.pw_dir); 959 free(save.pw_shell); 960 } 961 save = *p; 962 save.pw_name = sgetsave(p->pw_name); 963 save.pw_passwd = sgetsave(p->pw_passwd); 964 save.pw_gecos = sgetsave(p->pw_gecos); 965 save.pw_dir = sgetsave(p->pw_dir); 966 save.pw_shell = sgetsave(p->pw_shell); 967 return (&save); 968 } 969 970 static int login_attempts; /* number of failed login attempts */ 971 static int askpasswd; /* had user command, ask for passwd */ 972 static char curname[MAXLOGNAME]; /* current USER name */ 973 974 /* 975 * USER command. 976 * Sets global passwd pointer pw if named account exists and is acceptable; 977 * sets askpasswd if a PASS command is expected. If logged in previously, 978 * need to reset state. If name is "ftp" or "anonymous", the name is not in 979 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 980 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 981 * requesting login privileges. Disallow anyone who does not have a standard 982 * shell as returned by getusershell(). Disallow anyone mentioned in the file 983 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 984 */ 985 void 986 user(char *name) 987 { 988 char *cp, *shell; 989 990 if (logged_in) { 991 if (guest) { 992 reply(530, "Can't change user from guest login."); 993 return; 994 } else if (dochroot) { 995 reply(530, "Can't change user from chroot user."); 996 return; 997 } 998 end_login(); 999 } 1000 1001 guest = 0; 1002 #ifdef VIRTUAL_HOSTING 1003 pw = sgetpwnam(thishost->anonuser); 1004 #else 1005 pw = sgetpwnam("ftp"); 1006 #endif 1007 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1008 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 1009 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 1010 reply(530, "User %s access denied.", name); 1011 else if (pw != NULL) { 1012 guest = 1; 1013 askpasswd = 1; 1014 reply(331, 1015 "Guest login ok, send your email address as password."); 1016 } else 1017 reply(530, "User %s unknown.", name); 1018 if (!askpasswd && logging) 1019 syslog(LOG_NOTICE, 1020 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1021 return; 1022 } 1023 if (anon_only != 0) { 1024 reply(530, "Sorry, only anonymous ftp allowed."); 1025 return; 1026 } 1027 1028 if ((pw = sgetpwnam(name))) { 1029 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1030 shell = _PATH_BSHELL; 1031 setusershell(); 1032 while ((cp = getusershell()) != NULL) 1033 if (strcmp(cp, shell) == 0) 1034 break; 1035 endusershell(); 1036 1037 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1038 reply(530, "User %s access denied.", name); 1039 if (logging) 1040 syslog(LOG_NOTICE, 1041 "FTP LOGIN REFUSED FROM %s, %s", 1042 remotehost, name); 1043 pw = NULL; 1044 return; 1045 } 1046 } 1047 if (logging) 1048 strncpy(curname, name, sizeof(curname)-1); 1049 1050 pwok = 0; 1051 #ifdef USE_PAM 1052 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1053 #endif 1054 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1055 pwok = (pw != NULL) && 1056 opieaccessfile(remotehost) && 1057 opiealways(pw->pw_dir); 1058 reply(331, "Response to %s %s for %s.", 1059 opieprompt, pwok ? "requested" : "required", name); 1060 } else { 1061 pwok = 1; 1062 reply(331, "Password required for %s.", name); 1063 } 1064 askpasswd = 1; 1065 /* 1066 * Delay before reading passwd after first failed 1067 * attempt to slow down passwd-guessing programs. 1068 */ 1069 if (login_attempts) 1070 sleep(login_attempts); 1071 } 1072 1073 /* 1074 * Check if a user is in the file "fname", 1075 * return a pointer to a malloc'd string with the rest 1076 * of the matching line in "residue" if not NULL. 1077 */ 1078 static int 1079 checkuser(char *fname, char *name, int pwset, char **residue) 1080 { 1081 FILE *fd; 1082 int found = 0; 1083 size_t len; 1084 char *line, *mp, *p; 1085 1086 if ((fd = fopen(fname, "r")) != NULL) { 1087 while (!found && (line = fgetln(fd, &len)) != NULL) { 1088 /* skip comments */ 1089 if (line[0] == '#') 1090 continue; 1091 if (line[len - 1] == '\n') { 1092 line[len - 1] = '\0'; 1093 mp = NULL; 1094 } else { 1095 if ((mp = malloc(len + 1)) == NULL) 1096 fatalerror("Ran out of memory."); 1097 memcpy(mp, line, len); 1098 mp[len] = '\0'; 1099 line = mp; 1100 } 1101 /* avoid possible leading and trailing whitespace */ 1102 p = strtok(line, " \t"); 1103 /* skip empty lines */ 1104 if (p == NULL) 1105 goto nextline; 1106 /* 1107 * if first chr is '@', check group membership 1108 */ 1109 if (p[0] == '@') { 1110 int i = 0; 1111 struct group *grp; 1112 1113 if (p[1] == '\0') /* single @ matches anyone */ 1114 found = 1; 1115 else { 1116 if ((grp = getgrnam(p+1)) == NULL) 1117 goto nextline; 1118 /* 1119 * Check user's default group 1120 */ 1121 if (pwset && grp->gr_gid == pw->pw_gid) 1122 found = 1; 1123 /* 1124 * Check supplementary groups 1125 */ 1126 while (!found && grp->gr_mem[i]) 1127 found = strcmp(name, 1128 grp->gr_mem[i++]) 1129 == 0; 1130 } 1131 } 1132 /* 1133 * Otherwise, just check for username match 1134 */ 1135 else 1136 found = strcmp(p, name) == 0; 1137 /* 1138 * Save the rest of line to "residue" if matched 1139 */ 1140 if (found && residue) { 1141 if ((p = strtok(NULL, "")) != NULL) 1142 p += strspn(p, " \t"); 1143 if (p && *p) { 1144 if ((*residue = strdup(p)) == NULL) 1145 fatalerror("Ran out of memory."); 1146 } else 1147 *residue = NULL; 1148 } 1149 nextline: 1150 if (mp) 1151 free(mp); 1152 } 1153 (void) fclose(fd); 1154 } 1155 return (found); 1156 } 1157 1158 /* 1159 * Terminate login as previous user, if any, resetting state; 1160 * used when USER command is given or login fails. 1161 */ 1162 static void 1163 end_login(void) 1164 { 1165 #ifdef USE_PAM 1166 int e; 1167 #endif 1168 1169 (void) seteuid(0); 1170 if (logged_in && dowtmp) 1171 ftpd_logwtmp(ttyline, "", NULL); 1172 pw = NULL; 1173 #ifdef LOGIN_CAP 1174 setusercontext(NULL, getpwuid(0), 0, 1175 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1176 LOGIN_SETMAC); 1177 #endif 1178 #ifdef USE_PAM 1179 if (pamh) { 1180 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1181 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1182 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1183 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1184 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1185 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1186 pamh = NULL; 1187 } 1188 #endif 1189 logged_in = 0; 1190 guest = 0; 1191 dochroot = 0; 1192 } 1193 1194 #ifdef USE_PAM 1195 1196 /* 1197 * the following code is stolen from imap-uw PAM authentication module and 1198 * login.c 1199 */ 1200 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1201 1202 struct cred_t { 1203 const char *uname; /* user name */ 1204 const char *pass; /* password */ 1205 }; 1206 typedef struct cred_t cred_t; 1207 1208 static int 1209 auth_conv(int num_msg, const struct pam_message **msg, 1210 struct pam_response **resp, void *appdata) 1211 { 1212 int i; 1213 cred_t *cred = (cred_t *) appdata; 1214 struct pam_response *reply; 1215 1216 reply = calloc(num_msg, sizeof *reply); 1217 if (reply == NULL) 1218 return PAM_BUF_ERR; 1219 1220 for (i = 0; i < num_msg; i++) { 1221 switch (msg[i]->msg_style) { 1222 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1223 reply[i].resp_retcode = PAM_SUCCESS; 1224 reply[i].resp = COPY_STRING(cred->uname); 1225 /* PAM frees resp. */ 1226 break; 1227 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1228 reply[i].resp_retcode = PAM_SUCCESS; 1229 reply[i].resp = COPY_STRING(cred->pass); 1230 /* PAM frees resp. */ 1231 break; 1232 case PAM_TEXT_INFO: 1233 case PAM_ERROR_MSG: 1234 reply[i].resp_retcode = PAM_SUCCESS; 1235 reply[i].resp = NULL; 1236 break; 1237 default: /* unknown message style */ 1238 free(reply); 1239 return PAM_CONV_ERR; 1240 } 1241 } 1242 1243 *resp = reply; 1244 return PAM_SUCCESS; 1245 } 1246 1247 /* 1248 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1249 * authenticated, or 1 if not authenticated. If some sort of PAM system 1250 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1251 * function returns -1. This can be used as an indication that we should 1252 * fall back to a different authentication mechanism. 1253 */ 1254 static int 1255 auth_pam(struct passwd **ppw, const char *pass) 1256 { 1257 const char *tmpl_user; 1258 const void *item; 1259 int rval; 1260 int e; 1261 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1262 struct pam_conv conv = { &auth_conv, &auth_cred }; 1263 1264 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1265 if (e != PAM_SUCCESS) { 1266 /* 1267 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1268 * if context creation has failed in the first place. 1269 */ 1270 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1271 return -1; 1272 } 1273 1274 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1275 if (e != PAM_SUCCESS) { 1276 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1277 pam_strerror(pamh, e)); 1278 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1279 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1280 } 1281 pamh = NULL; 1282 return -1; 1283 } 1284 1285 e = pam_authenticate(pamh, 0); 1286 switch (e) { 1287 case PAM_SUCCESS: 1288 /* 1289 * With PAM we support the concept of a "template" 1290 * user. The user enters a login name which is 1291 * authenticated by PAM, usually via a remote service 1292 * such as RADIUS or TACACS+. If authentication 1293 * succeeds, a different but related "template" name 1294 * is used for setting the credentials, shell, and 1295 * home directory. The name the user enters need only 1296 * exist on the remote authentication server, but the 1297 * template name must be present in the local password 1298 * database. 1299 * 1300 * This is supported by two various mechanisms in the 1301 * individual modules. However, from the application's 1302 * point of view, the template user is always passed 1303 * back as a changed value of the PAM_USER item. 1304 */ 1305 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1306 PAM_SUCCESS) { 1307 tmpl_user = (const char *) item; 1308 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1309 *ppw = getpwnam(tmpl_user); 1310 } else 1311 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1312 pam_strerror(pamh, e)); 1313 rval = 0; 1314 break; 1315 1316 case PAM_AUTH_ERR: 1317 case PAM_USER_UNKNOWN: 1318 case PAM_MAXTRIES: 1319 rval = 1; 1320 break; 1321 1322 default: 1323 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1324 rval = -1; 1325 break; 1326 } 1327 1328 if (rval == 0) { 1329 e = pam_acct_mgmt(pamh, 0); 1330 if (e != PAM_SUCCESS) { 1331 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1332 pam_strerror(pamh, e)); 1333 rval = 1; 1334 } 1335 } 1336 1337 if (rval != 0) { 1338 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1339 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1340 } 1341 pamh = NULL; 1342 } 1343 return rval; 1344 } 1345 1346 #endif /* USE_PAM */ 1347 1348 void 1349 pass(char *passwd) 1350 { 1351 int rval; 1352 FILE *fd; 1353 #ifdef LOGIN_CAP 1354 login_cap_t *lc = NULL; 1355 #endif 1356 #ifdef USE_PAM 1357 int e; 1358 #endif 1359 char *residue = NULL; 1360 char *xpasswd; 1361 1362 if (logged_in || askpasswd == 0) { 1363 reply(503, "Login with USER first."); 1364 return; 1365 } 1366 askpasswd = 0; 1367 if (!guest) { /* "ftp" is only account allowed no password */ 1368 if (pw == NULL) { 1369 rval = 1; /* failure below */ 1370 goto skip; 1371 } 1372 #ifdef USE_PAM 1373 rval = auth_pam(&pw, passwd); 1374 if (rval >= 0) { 1375 opieunlock(); 1376 goto skip; 1377 } 1378 #endif 1379 if (opieverify(&opiedata, passwd) == 0) 1380 xpasswd = pw->pw_passwd; 1381 else if (pwok) { 1382 xpasswd = crypt(passwd, pw->pw_passwd); 1383 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1384 xpasswd = ":"; 1385 } else { 1386 rval = 1; 1387 goto skip; 1388 } 1389 rval = strcmp(pw->pw_passwd, xpasswd); 1390 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1391 rval = 1; /* failure */ 1392 skip: 1393 /* 1394 * If rval == 1, the user failed the authentication check 1395 * above. If rval == 0, either PAM or local authentication 1396 * succeeded. 1397 */ 1398 if (rval) { 1399 reply(530, "Login incorrect."); 1400 if (logging) { 1401 syslog(LOG_NOTICE, 1402 "FTP LOGIN FAILED FROM %s", 1403 remotehost); 1404 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1405 "FTP LOGIN FAILED FROM %s, %s", 1406 remotehost, curname); 1407 } 1408 pw = NULL; 1409 if (login_attempts++ >= 5) { 1410 syslog(LOG_NOTICE, 1411 "repeated login failures from %s", 1412 remotehost); 1413 exit(0); 1414 } 1415 return; 1416 } 1417 } 1418 login_attempts = 0; /* this time successful */ 1419 if (setegid(pw->pw_gid) < 0) { 1420 reply(550, "Can't set gid."); 1421 return; 1422 } 1423 /* May be overridden by login.conf */ 1424 (void) umask(defumask); 1425 #ifdef LOGIN_CAP 1426 if ((lc = login_getpwclass(pw)) != NULL) { 1427 char remote_ip[NI_MAXHOST]; 1428 1429 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1430 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1431 NI_NUMERICHOST)) 1432 *remote_ip = 0; 1433 remote_ip[sizeof(remote_ip) - 1] = 0; 1434 if (!auth_hostok(lc, remotehost, remote_ip)) { 1435 syslog(LOG_INFO|LOG_AUTH, 1436 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1437 pw->pw_name); 1438 reply(530, "Permission denied."); 1439 pw = NULL; 1440 return; 1441 } 1442 if (!auth_timeok(lc, time(NULL))) { 1443 reply(530, "Login not available right now."); 1444 pw = NULL; 1445 return; 1446 } 1447 } 1448 setusercontext(lc, pw, 0, 1449 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1450 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1451 #else 1452 setlogin(pw->pw_name); 1453 (void) initgroups(pw->pw_name, pw->pw_gid); 1454 #endif 1455 1456 #ifdef USE_PAM 1457 if (pamh) { 1458 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1459 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1460 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1461 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1462 } 1463 } 1464 #endif 1465 1466 /* open wtmp before chroot */ 1467 if (dowtmp) 1468 ftpd_logwtmp(ttyline, pw->pw_name, 1469 (struct sockaddr *)&his_addr); 1470 logged_in = 1; 1471 1472 if (guest && stats && statfd < 0) 1473 #ifdef VIRTUAL_HOSTING 1474 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1475 #else 1476 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1477 #endif 1478 if (statfd < 0) 1479 stats = 0; 1480 1481 dochroot = 1482 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1483 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1484 || login_getcapbool(lc, "ftp-chroot", 0) 1485 #endif 1486 ; 1487 chrootdir = NULL; 1488 /* 1489 * For a chrooted local user, 1490 * a) see whether ftpchroot(5) specifies a chroot directory, 1491 * b) extract the directory pathname from the line, 1492 * c) expand it to the absolute pathname if necessary. 1493 */ 1494 if (dochroot && residue && 1495 (chrootdir = strtok(residue, " \t")) != NULL) { 1496 if (chrootdir[0] != '/') 1497 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1498 else 1499 chrootdir = strdup(chrootdir); /* make it permanent */ 1500 if (chrootdir == NULL) 1501 fatalerror("Ran out of memory."); 1502 } 1503 if (guest || dochroot) { 1504 /* 1505 * If no chroot directory set yet, use the login directory. 1506 * Copy it so it can be modified while pw->pw_dir stays intact. 1507 */ 1508 if (chrootdir == NULL && 1509 (chrootdir = strdup(pw->pw_dir)) == NULL) 1510 fatalerror("Ran out of memory."); 1511 /* 1512 * Check for the "/chroot/./home" syntax, 1513 * separate the chroot and home directory pathnames. 1514 */ 1515 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1516 *(homedir++) = '\0'; /* wipe '/' */ 1517 homedir++; /* skip '.' */ 1518 } else { 1519 /* 1520 * We MUST do a chdir() after the chroot. Otherwise 1521 * the old current directory will be accessible as "." 1522 * outside the new root! 1523 */ 1524 homedir = "/"; 1525 } 1526 /* 1527 * Finally, do chroot() 1528 */ 1529 if (chroot(chrootdir) < 0) { 1530 reply(550, "Can't change root."); 1531 goto bad; 1532 } 1533 } else /* real user w/o chroot */ 1534 homedir = pw->pw_dir; 1535 /* 1536 * Set euid *before* doing chdir() so 1537 * a) the user won't be carried to a directory that he couldn't reach 1538 * on his own due to no permission to upper path components, 1539 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1540 * (uid 0 has no root power over NFS if not mapped explicitly.) 1541 */ 1542 if (seteuid(pw->pw_uid) < 0) { 1543 reply(550, "Can't set uid."); 1544 goto bad; 1545 } 1546 if (chdir(homedir) < 0) { 1547 if (guest || dochroot) { 1548 reply(550, "Can't change to base directory."); 1549 goto bad; 1550 } else { 1551 if (chdir("/") < 0) { 1552 reply(550, "Root is inaccessible."); 1553 goto bad; 1554 } 1555 lreply(230, "No directory! Logging in with home=/."); 1556 } 1557 } 1558 1559 /* 1560 * Display a login message, if it exists. 1561 * N.B. reply(230,) must follow the message. 1562 */ 1563 #ifdef VIRTUAL_HOSTING 1564 fd = fopen(thishost->loginmsg, "r"); 1565 #else 1566 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1567 #endif 1568 if (fd != NULL) { 1569 char *cp, line[LINE_MAX]; 1570 1571 while (fgets(line, sizeof(line), fd) != NULL) { 1572 if ((cp = strchr(line, '\n')) != NULL) 1573 *cp = '\0'; 1574 lreply(230, "%s", line); 1575 } 1576 (void) fflush(stdout); 1577 (void) fclose(fd); 1578 } 1579 if (guest) { 1580 if (ident != NULL) 1581 free(ident); 1582 ident = strdup(passwd); 1583 if (ident == NULL) 1584 fatalerror("Ran out of memory."); 1585 1586 reply(230, "Guest login ok, access restrictions apply."); 1587 #ifdef SETPROCTITLE 1588 #ifdef VIRTUAL_HOSTING 1589 if (thishost != firsthost) 1590 snprintf(proctitle, sizeof(proctitle), 1591 "%s: anonymous(%s)/%s", remotehost, hostname, 1592 passwd); 1593 else 1594 #endif 1595 snprintf(proctitle, sizeof(proctitle), 1596 "%s: anonymous/%s", remotehost, passwd); 1597 setproctitle("%s", proctitle); 1598 #endif /* SETPROCTITLE */ 1599 if (logging) 1600 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1601 remotehost, passwd); 1602 } else { 1603 if (dochroot) 1604 reply(230, "User %s logged in, " 1605 "access restrictions apply.", pw->pw_name); 1606 else 1607 reply(230, "User %s logged in.", pw->pw_name); 1608 1609 #ifdef SETPROCTITLE 1610 snprintf(proctitle, sizeof(proctitle), 1611 "%s: user/%s", remotehost, pw->pw_name); 1612 setproctitle("%s", proctitle); 1613 #endif /* SETPROCTITLE */ 1614 if (logging) 1615 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1616 remotehost, pw->pw_name); 1617 } 1618 if (logging && (guest || dochroot)) 1619 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1620 #ifdef LOGIN_CAP 1621 login_close(lc); 1622 #endif 1623 if (residue) 1624 free(residue); 1625 return; 1626 bad: 1627 /* Forget all about it... */ 1628 #ifdef LOGIN_CAP 1629 login_close(lc); 1630 #endif 1631 if (residue) 1632 free(residue); 1633 end_login(); 1634 } 1635 1636 void 1637 retrieve(char *cmd, char *name) 1638 { 1639 FILE *fin, *dout; 1640 struct stat st; 1641 int (*closefunc)(FILE *); 1642 time_t start; 1643 1644 if (cmd == 0) { 1645 fin = fopen(name, "r"), closefunc = fclose; 1646 st.st_size = 0; 1647 } else { 1648 char line[BUFSIZ]; 1649 1650 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1651 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1652 st.st_size = -1; 1653 st.st_blksize = BUFSIZ; 1654 } 1655 if (fin == NULL) { 1656 if (errno != 0) { 1657 perror_reply(550, name); 1658 if (cmd == 0) { 1659 LOGCMD("get", name); 1660 } 1661 } 1662 return; 1663 } 1664 byte_count = -1; 1665 if (cmd == 0) { 1666 if (fstat(fileno(fin), &st) < 0) { 1667 perror_reply(550, name); 1668 goto done; 1669 } 1670 if (!S_ISREG(st.st_mode)) { 1671 /* 1672 * Never sending a raw directory is a workaround 1673 * for buggy clients that will attempt to RETR 1674 * a directory before listing it, e.g., Mozilla. 1675 * Preventing a guest from getting irregular files 1676 * is a simple security measure. 1677 */ 1678 if (S_ISDIR(st.st_mode) || guest) { 1679 reply(550, "%s: not a plain file.", name); 1680 goto done; 1681 } 1682 st.st_size = -1; 1683 /* st.st_blksize is set for all descriptor types */ 1684 } 1685 } 1686 if (restart_point) { 1687 if (type == TYPE_A) { 1688 off_t i, n; 1689 int c; 1690 1691 n = restart_point; 1692 i = 0; 1693 while (i++ < n) { 1694 if ((c=getc(fin)) == EOF) { 1695 perror_reply(550, name); 1696 goto done; 1697 } 1698 if (c == '\n') 1699 i++; 1700 } 1701 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1702 perror_reply(550, name); 1703 goto done; 1704 } 1705 } 1706 dout = dataconn(name, st.st_size, "w"); 1707 if (dout == NULL) 1708 goto done; 1709 time(&start); 1710 send_data(fin, dout, st.st_blksize, st.st_size, 1711 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1712 if (cmd == 0 && guest && stats && byte_count > 0) 1713 logxfer(name, byte_count, start); 1714 (void) fclose(dout); 1715 data = -1; 1716 pdata = -1; 1717 done: 1718 if (cmd == 0) 1719 LOGBYTES("get", name, byte_count); 1720 (*closefunc)(fin); 1721 } 1722 1723 void 1724 store(char *name, char *mode, int unique) 1725 { 1726 int fd; 1727 FILE *fout, *din; 1728 int (*closefunc)(FILE *); 1729 1730 if (*mode == 'a') { /* APPE */ 1731 if (unique) { 1732 /* Programming error */ 1733 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1734 unique = 0; 1735 } 1736 if (guest && noguestmod) { 1737 reply(550, "Appending to existing file denied."); 1738 goto err; 1739 } 1740 restart_point = 0; /* not affected by preceding REST */ 1741 } 1742 if (unique) /* STOU overrides REST */ 1743 restart_point = 0; 1744 if (guest && noguestmod) { 1745 if (restart_point) { /* guest STOR w/REST */ 1746 reply(550, "Modifying existing file denied."); 1747 goto err; 1748 } else /* treat guest STOR as STOU */ 1749 unique = 1; 1750 } 1751 1752 if (restart_point) 1753 mode = "r+"; /* so ASCII manual seek can work */ 1754 if (unique) { 1755 if ((fd = guniquefd(name, &name)) < 0) 1756 goto err; 1757 fout = fdopen(fd, mode); 1758 } else 1759 fout = fopen(name, mode); 1760 closefunc = fclose; 1761 if (fout == NULL) { 1762 perror_reply(553, name); 1763 goto err; 1764 } 1765 byte_count = -1; 1766 if (restart_point) { 1767 if (type == TYPE_A) { 1768 off_t i, n; 1769 int c; 1770 1771 n = restart_point; 1772 i = 0; 1773 while (i++ < n) { 1774 if ((c=getc(fout)) == EOF) { 1775 perror_reply(550, name); 1776 goto done; 1777 } 1778 if (c == '\n') 1779 i++; 1780 } 1781 /* 1782 * We must do this seek to "current" position 1783 * because we are changing from reading to 1784 * writing. 1785 */ 1786 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1787 perror_reply(550, name); 1788 goto done; 1789 } 1790 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1791 perror_reply(550, name); 1792 goto done; 1793 } 1794 } 1795 din = dataconn(name, -1, "r"); 1796 if (din == NULL) 1797 goto done; 1798 if (receive_data(din, fout) == 0) { 1799 if (unique) 1800 reply(226, "Transfer complete (unique file name:%s).", 1801 name); 1802 else 1803 reply(226, "Transfer complete."); 1804 } 1805 (void) fclose(din); 1806 data = -1; 1807 pdata = -1; 1808 done: 1809 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1810 (*closefunc)(fout); 1811 return; 1812 err: 1813 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1814 return; 1815 } 1816 1817 static FILE * 1818 getdatasock(char *mode) 1819 { 1820 int on = 1, s, t, tries; 1821 1822 if (data >= 0) 1823 return (fdopen(data, mode)); 1824 1825 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1826 if (s < 0) 1827 goto bad; 1828 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1829 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1830 /* anchor socket to avoid multi-homing problems */ 1831 data_source = ctrl_addr; 1832 data_source.su_port = htons(dataport); 1833 (void) seteuid(0); 1834 for (tries = 1; ; tries++) { 1835 /* 1836 * We should loop here since it's possible that 1837 * another ftpd instance has passed this point and is 1838 * trying to open a data connection in active mode now. 1839 * Until the other connection is opened, we'll be getting 1840 * EADDRINUSE because no SOCK_STREAM sockets in the system 1841 * can share both local and remote addresses, localIP:20 1842 * and *:* in this case. 1843 */ 1844 if (bind(s, (struct sockaddr *)&data_source, 1845 data_source.su_len) >= 0) 1846 break; 1847 if (errno != EADDRINUSE || tries > 10) 1848 goto bad; 1849 sleep(tries); 1850 } 1851 (void) seteuid(pw->pw_uid); 1852 #ifdef IP_TOS 1853 if (data_source.su_family == AF_INET) 1854 { 1855 on = IPTOS_THROUGHPUT; 1856 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1857 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1858 } 1859 #endif 1860 #ifdef TCP_NOPUSH 1861 /* 1862 * Turn off push flag to keep sender TCP from sending short packets 1863 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1864 * to set the send buffer size as well, but that may not be desirable 1865 * in heavy-load situations. 1866 */ 1867 on = 1; 1868 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1869 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1870 #endif 1871 #ifdef SO_SNDBUF 1872 on = 65536; 1873 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1874 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1875 #endif 1876 1877 return (fdopen(s, mode)); 1878 bad: 1879 /* Return the real value of errno (close may change it) */ 1880 t = errno; 1881 (void) seteuid(pw->pw_uid); 1882 (void) close(s); 1883 errno = t; 1884 return (NULL); 1885 } 1886 1887 static FILE * 1888 dataconn(char *name, off_t size, char *mode) 1889 { 1890 char sizebuf[32]; 1891 FILE *file; 1892 int retry = 0, tos, conerrno; 1893 1894 file_size = size; 1895 byte_count = 0; 1896 if (size != -1) 1897 (void) snprintf(sizebuf, sizeof(sizebuf), 1898 " (%jd bytes)", (intmax_t)size); 1899 else 1900 *sizebuf = '\0'; 1901 if (pdata >= 0) { 1902 union sockunion from; 1903 int flags; 1904 int s, fromlen = ctrl_addr.su_len; 1905 struct timeval timeout; 1906 fd_set set; 1907 1908 FD_ZERO(&set); 1909 FD_SET(pdata, &set); 1910 1911 timeout.tv_usec = 0; 1912 timeout.tv_sec = 120; 1913 1914 /* 1915 * Granted a socket is in the blocking I/O mode, 1916 * accept() will block after a successful select() 1917 * if the selected connection dies in between. 1918 * Therefore set the non-blocking I/O flag here. 1919 */ 1920 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1921 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1922 goto pdata_err; 1923 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1924 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1925 goto pdata_err; 1926 (void) close(pdata); 1927 pdata = s; 1928 /* 1929 * Unset the inherited non-blocking I/O flag 1930 * on the child socket so stdio can work on it. 1931 */ 1932 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1933 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1934 goto pdata_err; 1935 #ifdef IP_TOS 1936 if (from.su_family == AF_INET) 1937 { 1938 tos = IPTOS_THROUGHPUT; 1939 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1940 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1941 } 1942 #endif 1943 reply(150, "Opening %s mode data connection for '%s'%s.", 1944 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1945 return (fdopen(pdata, mode)); 1946 pdata_err: 1947 reply(425, "Can't open data connection."); 1948 (void) close(pdata); 1949 pdata = -1; 1950 return (NULL); 1951 } 1952 if (data >= 0) { 1953 reply(125, "Using existing data connection for '%s'%s.", 1954 name, sizebuf); 1955 usedefault = 1; 1956 return (fdopen(data, mode)); 1957 } 1958 if (usedefault) 1959 data_dest = his_addr; 1960 usedefault = 1; 1961 do { 1962 file = getdatasock(mode); 1963 if (file == NULL) { 1964 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 1965 1966 if (getnameinfo((struct sockaddr *)&data_source, 1967 data_source.su_len, 1968 hostbuf, sizeof(hostbuf) - 1, 1969 portbuf, sizeof(portbuf) - 1, 1970 NI_NUMERICHOST|NI_NUMERICSERV)) 1971 *hostbuf = *portbuf = 0; 1972 hostbuf[sizeof(hostbuf) - 1] = 0; 1973 portbuf[sizeof(portbuf) - 1] = 0; 1974 reply(425, "Can't create data socket (%s,%s): %s.", 1975 hostbuf, portbuf, strerror(errno)); 1976 return (NULL); 1977 } 1978 data = fileno(file); 1979 conerrno = 0; 1980 if (connect(data, (struct sockaddr *)&data_dest, 1981 data_dest.su_len) == 0) 1982 break; 1983 conerrno = errno; 1984 (void) fclose(file); 1985 data = -1; 1986 if (conerrno == EADDRINUSE) { 1987 sleep(swaitint); 1988 retry += swaitint; 1989 } else { 1990 break; 1991 } 1992 } while (retry <= swaitmax); 1993 if (conerrno != 0) { 1994 reply(425, "Can't build data connection: %s.", 1995 strerror(conerrno)); 1996 return (NULL); 1997 } 1998 reply(150, "Opening %s mode data connection for '%s'%s.", 1999 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2000 return (file); 2001 } 2002 2003 /* 2004 * A helper macro to avoid code duplication 2005 * in send_data() and receive_data(). 2006 * 2007 * XXX We have to block SIGURG during putc() because BSD stdio 2008 * is unable to restart interrupted write operations and hence 2009 * the entire buffer contents will be lost as soon as a write() 2010 * call indicates EINTR to stdio. 2011 */ 2012 #define FTPD_PUTC(ch, file, label) \ 2013 do { \ 2014 int ret; \ 2015 \ 2016 do { \ 2017 START_UNSAFE; \ 2018 ret = putc((ch), (file)); \ 2019 END_UNSAFE; \ 2020 CHECKOOB(return (-1)) \ 2021 else if (ferror(file)) \ 2022 goto label; \ 2023 clearerr(file); \ 2024 } while (ret == EOF); \ 2025 } while (0) 2026 2027 /* 2028 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 2029 * encapsulation of the data subject to Mode, Structure, and Type. 2030 * 2031 * NB: Form isn't handled. 2032 */ 2033 static int 2034 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2035 { 2036 int c, cp, filefd, netfd; 2037 char *buf; 2038 2039 STARTXFER; 2040 2041 switch (type) { 2042 2043 case TYPE_A: 2044 cp = EOF; 2045 for (;;) { 2046 c = getc(instr); 2047 CHECKOOB(return (-1)) 2048 else if (c == EOF && ferror(instr)) 2049 goto file_err; 2050 if (c == EOF) { 2051 if (ferror(instr)) { /* resume after OOB */ 2052 clearerr(instr); 2053 continue; 2054 } 2055 if (feof(instr)) /* EOF */ 2056 break; 2057 syslog(LOG_ERR, "Internal: impossible condition" 2058 " on file after getc()"); 2059 goto file_err; 2060 } 2061 if (c == '\n' && cp != '\r') { 2062 FTPD_PUTC('\r', outstr, data_err); 2063 byte_count++; 2064 } 2065 FTPD_PUTC(c, outstr, data_err); 2066 byte_count++; 2067 cp = c; 2068 } 2069 #ifdef notyet /* BSD stdio isn't ready for that */ 2070 while (fflush(outstr) == EOF) { 2071 CHECKOOB(return (-1)) 2072 else 2073 goto data_err; 2074 clearerr(outstr); 2075 } 2076 ENDXFER; 2077 #else 2078 ENDXFER; 2079 if (fflush(outstr) == EOF) 2080 goto data_err; 2081 #endif 2082 reply(226, "Transfer complete."); 2083 return (0); 2084 2085 case TYPE_I: 2086 case TYPE_L: 2087 /* 2088 * isreg is only set if we are not doing restart and we 2089 * are sending a regular file 2090 */ 2091 netfd = fileno(outstr); 2092 filefd = fileno(instr); 2093 2094 if (isreg) { 2095 char *msg = "Transfer complete."; 2096 off_t cnt, offset; 2097 int err; 2098 2099 cnt = offset = 0; 2100 2101 while (filesize > 0) { 2102 err = sendfile(filefd, netfd, offset, 0, 2103 NULL, &cnt, 0); 2104 /* 2105 * Calculate byte_count before OOB processing. 2106 * It can be used in myoob() later. 2107 */ 2108 byte_count += cnt; 2109 offset += cnt; 2110 filesize -= cnt; 2111 CHECKOOB(return (-1)) 2112 else if (err == -1) { 2113 if (errno != EINTR && 2114 cnt == 0 && offset == 0) 2115 goto oldway; 2116 goto data_err; 2117 } 2118 if (err == -1) /* resume after OOB */ 2119 continue; 2120 /* 2121 * We hit the EOF prematurely. 2122 * Perhaps the file was externally truncated. 2123 */ 2124 if (cnt == 0) { 2125 msg = "Transfer finished due to " 2126 "premature end of file."; 2127 break; 2128 } 2129 } 2130 ENDXFER; 2131 reply(226, msg); 2132 return (0); 2133 } 2134 2135 oldway: 2136 if ((buf = malloc(blksize)) == NULL) { 2137 ENDXFER; 2138 reply(451, "Ran out of memory."); 2139 return (-1); 2140 } 2141 2142 for (;;) { 2143 int cnt, len; 2144 char *bp; 2145 2146 cnt = read(filefd, buf, blksize); 2147 CHECKOOB(free(buf); return (-1)) 2148 else if (cnt < 0) { 2149 free(buf); 2150 goto file_err; 2151 } 2152 if (cnt < 0) /* resume after OOB */ 2153 continue; 2154 if (cnt == 0) /* EOF */ 2155 break; 2156 for (len = cnt, bp = buf; len > 0;) { 2157 cnt = write(netfd, bp, len); 2158 CHECKOOB(free(buf); return (-1)) 2159 else if (cnt < 0) { 2160 free(buf); 2161 goto data_err; 2162 } 2163 if (cnt <= 0) 2164 continue; 2165 len -= cnt; 2166 bp += cnt; 2167 byte_count += cnt; 2168 } 2169 } 2170 ENDXFER; 2171 free(buf); 2172 reply(226, "Transfer complete."); 2173 return (0); 2174 default: 2175 ENDXFER; 2176 reply(550, "Unimplemented TYPE %d in send_data.", type); 2177 return (-1); 2178 } 2179 2180 data_err: 2181 ENDXFER; 2182 perror_reply(426, "Data connection"); 2183 return (-1); 2184 2185 file_err: 2186 ENDXFER; 2187 perror_reply(551, "Error on input file"); 2188 return (-1); 2189 } 2190 2191 /* 2192 * Transfer data from peer to "outstr" using the appropriate encapulation of 2193 * the data subject to Mode, Structure, and Type. 2194 * 2195 * N.B.: Form isn't handled. 2196 */ 2197 static int 2198 receive_data(FILE *instr, FILE *outstr) 2199 { 2200 int c, cp; 2201 int bare_lfs = 0; 2202 2203 STARTXFER; 2204 2205 switch (type) { 2206 2207 case TYPE_I: 2208 case TYPE_L: 2209 for (;;) { 2210 int cnt, len; 2211 char *bp; 2212 char buf[BUFSIZ]; 2213 2214 cnt = read(fileno(instr), buf, sizeof(buf)); 2215 CHECKOOB(return (-1)) 2216 else if (cnt < 0) 2217 goto data_err; 2218 if (cnt < 0) /* resume after OOB */ 2219 continue; 2220 if (cnt == 0) /* EOF */ 2221 break; 2222 for (len = cnt, bp = buf; len > 0;) { 2223 cnt = write(fileno(outstr), bp, len); 2224 CHECKOOB(return (-1)) 2225 else if (cnt < 0) 2226 goto file_err; 2227 if (cnt <= 0) 2228 continue; 2229 len -= cnt; 2230 bp += cnt; 2231 byte_count += cnt; 2232 } 2233 } 2234 ENDXFER; 2235 return (0); 2236 2237 case TYPE_E: 2238 ENDXFER; 2239 reply(553, "TYPE E not implemented."); 2240 return (-1); 2241 2242 case TYPE_A: 2243 cp = EOF; 2244 for (;;) { 2245 c = getc(instr); 2246 CHECKOOB(return (-1)) 2247 else if (c == EOF && ferror(instr)) 2248 goto data_err; 2249 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2250 clearerr(instr); 2251 continue; 2252 } 2253 2254 if (cp == '\r') { 2255 if (c != '\n') 2256 FTPD_PUTC('\r', outstr, file_err); 2257 } else 2258 if (c == '\n') 2259 bare_lfs++; 2260 if (c == '\r') { 2261 byte_count++; 2262 cp = c; 2263 continue; 2264 } 2265 2266 /* Check for EOF here in order not to lose last \r. */ 2267 if (c == EOF) { 2268 if (feof(instr)) /* EOF */ 2269 break; 2270 syslog(LOG_ERR, "Internal: impossible condition" 2271 " on data stream after getc()"); 2272 goto data_err; 2273 } 2274 2275 byte_count++; 2276 FTPD_PUTC(c, outstr, file_err); 2277 cp = c; 2278 } 2279 #ifdef notyet /* BSD stdio isn't ready for that */ 2280 while (fflush(outstr) == EOF) { 2281 CHECKOOB(return (-1)) 2282 else 2283 goto file_err; 2284 clearerr(outstr); 2285 } 2286 ENDXFER; 2287 #else 2288 ENDXFER; 2289 if (fflush(outstr) == EOF) 2290 goto file_err; 2291 #endif 2292 if (bare_lfs) { 2293 lreply(226, 2294 "WARNING! %d bare linefeeds received in ASCII mode.", 2295 bare_lfs); 2296 (void)printf(" File may not have transferred correctly.\r\n"); 2297 } 2298 return (0); 2299 default: 2300 ENDXFER; 2301 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2302 return (-1); 2303 } 2304 2305 data_err: 2306 ENDXFER; 2307 perror_reply(426, "Data connection"); 2308 return (-1); 2309 2310 file_err: 2311 ENDXFER; 2312 perror_reply(452, "Error writing to file"); 2313 return (-1); 2314 } 2315 2316 void 2317 statfilecmd(char *filename) 2318 { 2319 FILE *fin; 2320 int atstart; 2321 int c, code; 2322 char line[LINE_MAX]; 2323 struct stat st; 2324 2325 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2326 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2327 fin = ftpd_popen(line, "r"); 2328 lreply(code, "Status of %s:", filename); 2329 atstart = 1; 2330 while ((c = getc(fin)) != EOF) { 2331 if (c == '\n') { 2332 if (ferror(stdout)){ 2333 perror_reply(421, "Control connection"); 2334 (void) ftpd_pclose(fin); 2335 dologout(1); 2336 /* NOTREACHED */ 2337 } 2338 if (ferror(fin)) { 2339 perror_reply(551, filename); 2340 (void) ftpd_pclose(fin); 2341 return; 2342 } 2343 (void) putc('\r', stdout); 2344 } 2345 /* 2346 * RFC 959 says neutral text should be prepended before 2347 * a leading 3-digit number followed by whitespace, but 2348 * many ftp clients can be confused by any leading digits, 2349 * as a matter of fact. 2350 */ 2351 if (atstart && isdigit(c)) 2352 (void) putc(' ', stdout); 2353 (void) putc(c, stdout); 2354 atstart = (c == '\n'); 2355 } 2356 (void) ftpd_pclose(fin); 2357 reply(code, "End of status."); 2358 } 2359 2360 void 2361 statcmd(void) 2362 { 2363 union sockunion *su; 2364 u_char *a, *p; 2365 char hname[NI_MAXHOST]; 2366 int ispassive; 2367 2368 if (hostinfo) { 2369 lreply(211, "%s FTP server status:", hostname); 2370 printf(" %s\r\n", version); 2371 } else 2372 lreply(211, "FTP server status:"); 2373 printf(" Connected to %s", remotehost); 2374 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2375 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2376 hname[sizeof(hname) - 1] = 0; 2377 if (strcmp(hname, remotehost) != 0) 2378 printf(" (%s)", hname); 2379 } 2380 printf("\r\n"); 2381 if (logged_in) { 2382 if (guest) 2383 printf(" Logged in anonymously\r\n"); 2384 else 2385 printf(" Logged in as %s\r\n", pw->pw_name); 2386 } else if (askpasswd) 2387 printf(" Waiting for password\r\n"); 2388 else 2389 printf(" Waiting for user name\r\n"); 2390 printf(" TYPE: %s", typenames[type]); 2391 if (type == TYPE_A || type == TYPE_E) 2392 printf(", FORM: %s", formnames[form]); 2393 if (type == TYPE_L) 2394 #if CHAR_BIT == 8 2395 printf(" %d", CHAR_BIT); 2396 #else 2397 printf(" %d", bytesize); /* need definition! */ 2398 #endif 2399 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2400 strunames[stru], modenames[mode]); 2401 if (data != -1) 2402 printf(" Data connection open\r\n"); 2403 else if (pdata != -1) { 2404 ispassive = 1; 2405 su = &pasv_addr; 2406 goto printaddr; 2407 } else if (usedefault == 0) { 2408 ispassive = 0; 2409 su = &data_dest; 2410 printaddr: 2411 #define UC(b) (((int) b) & 0xff) 2412 if (epsvall) { 2413 printf(" EPSV only mode (EPSV ALL)\r\n"); 2414 goto epsvonly; 2415 } 2416 2417 /* PORT/PASV */ 2418 if (su->su_family == AF_INET) { 2419 a = (u_char *) &su->su_sin.sin_addr; 2420 p = (u_char *) &su->su_sin.sin_port; 2421 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2422 ispassive ? "PASV" : "PORT", 2423 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2424 UC(p[0]), UC(p[1])); 2425 } 2426 2427 /* LPRT/LPSV */ 2428 { 2429 int alen, af, i; 2430 2431 switch (su->su_family) { 2432 case AF_INET: 2433 a = (u_char *) &su->su_sin.sin_addr; 2434 p = (u_char *) &su->su_sin.sin_port; 2435 alen = sizeof(su->su_sin.sin_addr); 2436 af = 4; 2437 break; 2438 case AF_INET6: 2439 a = (u_char *) &su->su_sin6.sin6_addr; 2440 p = (u_char *) &su->su_sin6.sin6_port; 2441 alen = sizeof(su->su_sin6.sin6_addr); 2442 af = 6; 2443 break; 2444 default: 2445 af = 0; 2446 break; 2447 } 2448 if (af) { 2449 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2450 af, alen); 2451 for (i = 0; i < alen; i++) 2452 printf("%d,", UC(a[i])); 2453 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2454 } 2455 } 2456 2457 epsvonly:; 2458 /* EPRT/EPSV */ 2459 { 2460 int af; 2461 2462 switch (su->su_family) { 2463 case AF_INET: 2464 af = 1; 2465 break; 2466 case AF_INET6: 2467 af = 2; 2468 break; 2469 default: 2470 af = 0; 2471 break; 2472 } 2473 if (af) { 2474 union sockunion tmp; 2475 2476 tmp = *su; 2477 if (tmp.su_family == AF_INET6) 2478 tmp.su_sin6.sin6_scope_id = 0; 2479 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2480 hname, sizeof(hname) - 1, NULL, 0, 2481 NI_NUMERICHOST)) { 2482 hname[sizeof(hname) - 1] = 0; 2483 printf(" %s |%d|%s|%d|\r\n", 2484 ispassive ? "EPSV" : "EPRT", 2485 af, hname, htons(tmp.su_port)); 2486 } 2487 } 2488 } 2489 #undef UC 2490 } else 2491 printf(" No data connection\r\n"); 2492 reply(211, "End of status."); 2493 } 2494 2495 void 2496 fatalerror(char *s) 2497 { 2498 2499 reply(451, "Error in server: %s", s); 2500 reply(221, "Closing connection due to server error."); 2501 dologout(0); 2502 /* NOTREACHED */ 2503 } 2504 2505 void 2506 reply(int n, const char *fmt, ...) 2507 { 2508 va_list ap; 2509 2510 (void)printf("%d ", n); 2511 va_start(ap, fmt); 2512 (void)vprintf(fmt, ap); 2513 va_end(ap); 2514 (void)printf("\r\n"); 2515 (void)fflush(stdout); 2516 if (ftpdebug) { 2517 syslog(LOG_DEBUG, "<--- %d ", n); 2518 va_start(ap, fmt); 2519 vsyslog(LOG_DEBUG, fmt, ap); 2520 va_end(ap); 2521 } 2522 } 2523 2524 void 2525 lreply(int n, const char *fmt, ...) 2526 { 2527 va_list ap; 2528 2529 (void)printf("%d- ", n); 2530 va_start(ap, fmt); 2531 (void)vprintf(fmt, ap); 2532 va_end(ap); 2533 (void)printf("\r\n"); 2534 (void)fflush(stdout); 2535 if (ftpdebug) { 2536 syslog(LOG_DEBUG, "<--- %d- ", n); 2537 va_start(ap, fmt); 2538 vsyslog(LOG_DEBUG, fmt, ap); 2539 va_end(ap); 2540 } 2541 } 2542 2543 static void 2544 ack(char *s) 2545 { 2546 2547 reply(250, "%s command successful.", s); 2548 } 2549 2550 void 2551 nack(char *s) 2552 { 2553 2554 reply(502, "%s command not implemented.", s); 2555 } 2556 2557 /* ARGSUSED */ 2558 void 2559 yyerror(char *s) 2560 { 2561 char *cp; 2562 2563 if ((cp = strchr(cbuf,'\n'))) 2564 *cp = '\0'; 2565 reply(500, "%s: command not understood.", cbuf); 2566 } 2567 2568 void 2569 delete(char *name) 2570 { 2571 struct stat st; 2572 2573 LOGCMD("delete", name); 2574 if (lstat(name, &st) < 0) { 2575 perror_reply(550, name); 2576 return; 2577 } 2578 if (S_ISDIR(st.st_mode)) { 2579 if (rmdir(name) < 0) { 2580 perror_reply(550, name); 2581 return; 2582 } 2583 goto done; 2584 } 2585 if (guest && noguestmod) { 2586 reply(550, "Operation not permitted."); 2587 return; 2588 } 2589 if (unlink(name) < 0) { 2590 perror_reply(550, name); 2591 return; 2592 } 2593 done: 2594 ack("DELE"); 2595 } 2596 2597 void 2598 cwd(char *path) 2599 { 2600 2601 if (chdir(path) < 0) 2602 perror_reply(550, path); 2603 else 2604 ack("CWD"); 2605 } 2606 2607 void 2608 makedir(char *name) 2609 { 2610 char *s; 2611 2612 LOGCMD("mkdir", name); 2613 if (guest && noguestmkd) 2614 reply(550, "Operation not permitted."); 2615 else if (mkdir(name, 0777) < 0) 2616 perror_reply(550, name); 2617 else { 2618 if ((s = doublequote(name)) == NULL) 2619 fatalerror("Ran out of memory."); 2620 reply(257, "\"%s\" directory created.", s); 2621 free(s); 2622 } 2623 } 2624 2625 void 2626 removedir(char *name) 2627 { 2628 2629 LOGCMD("rmdir", name); 2630 if (rmdir(name) < 0) 2631 perror_reply(550, name); 2632 else 2633 ack("RMD"); 2634 } 2635 2636 void 2637 pwd(void) 2638 { 2639 char *s, path[MAXPATHLEN + 1]; 2640 2641 if (getcwd(path, sizeof(path)) == NULL) 2642 perror_reply(550, "Get current directory"); 2643 else { 2644 if ((s = doublequote(path)) == NULL) 2645 fatalerror("Ran out of memory."); 2646 reply(257, "\"%s\" is current directory.", s); 2647 free(s); 2648 } 2649 } 2650 2651 char * 2652 renamefrom(char *name) 2653 { 2654 struct stat st; 2655 2656 if (guest && noguestmod) { 2657 reply(550, "Operation not permitted."); 2658 return (NULL); 2659 } 2660 if (lstat(name, &st) < 0) { 2661 perror_reply(550, name); 2662 return (NULL); 2663 } 2664 reply(350, "File exists, ready for destination name."); 2665 return (name); 2666 } 2667 2668 void 2669 renamecmd(char *from, char *to) 2670 { 2671 struct stat st; 2672 2673 LOGCMD2("rename", from, to); 2674 2675 if (guest && (stat(to, &st) == 0)) { 2676 reply(550, "%s: permission denied.", to); 2677 return; 2678 } 2679 2680 if (rename(from, to) < 0) 2681 perror_reply(550, "rename"); 2682 else 2683 ack("RNTO"); 2684 } 2685 2686 static void 2687 dolog(struct sockaddr *who) 2688 { 2689 char who_name[NI_MAXHOST]; 2690 2691 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2692 remotehost[sizeof(remotehost) - 1] = 0; 2693 if (getnameinfo(who, who->sa_len, 2694 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2695 *who_name = 0; 2696 who_name[sizeof(who_name) - 1] = 0; 2697 2698 #ifdef SETPROCTITLE 2699 #ifdef VIRTUAL_HOSTING 2700 if (thishost != firsthost) 2701 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2702 remotehost, hostname); 2703 else 2704 #endif 2705 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2706 remotehost); 2707 setproctitle("%s", proctitle); 2708 #endif /* SETPROCTITLE */ 2709 2710 if (logging) { 2711 #ifdef VIRTUAL_HOSTING 2712 if (thishost != firsthost) 2713 syslog(LOG_INFO, "connection from %s (%s) to %s", 2714 remotehost, who_name, hostname); 2715 else 2716 #endif 2717 syslog(LOG_INFO, "connection from %s (%s)", 2718 remotehost, who_name); 2719 } 2720 } 2721 2722 /* 2723 * Record logout in wtmp file 2724 * and exit with supplied status. 2725 */ 2726 void 2727 dologout(int status) 2728 { 2729 2730 if (logged_in && dowtmp) { 2731 (void) seteuid(0); 2732 ftpd_logwtmp(ttyline, "", NULL); 2733 } 2734 /* beware of flushing buffers after a SIGPIPE */ 2735 _exit(status); 2736 } 2737 2738 static void 2739 sigurg(int signo) 2740 { 2741 2742 recvurg = 1; 2743 } 2744 2745 static void 2746 maskurg(int flag) 2747 { 2748 int oerrno; 2749 sigset_t sset; 2750 2751 if (!transflag) { 2752 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2753 return; 2754 } 2755 oerrno = errno; 2756 sigemptyset(&sset); 2757 sigaddset(&sset, SIGURG); 2758 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2759 errno = oerrno; 2760 } 2761 2762 static void 2763 flagxfer(int flag) 2764 { 2765 2766 maskurg(!flag); 2767 if (flag) { 2768 recvurg = 0; 2769 transflag = 1; 2770 } else 2771 transflag = 0; 2772 } 2773 2774 /* 2775 * Returns 0 if OK to resume or -1 if abort requested. 2776 */ 2777 static int 2778 myoob(void) 2779 { 2780 char *cp; 2781 2782 if (!transflag) { 2783 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2784 return (0); 2785 } 2786 cp = tmpline; 2787 if (getline(cp, 7, stdin) == NULL) { 2788 reply(221, "You could at least say goodbye."); 2789 dologout(0); 2790 } 2791 upper(cp); 2792 if (strcmp(cp, "ABOR\r\n") == 0) { 2793 tmpline[0] = '\0'; 2794 reply(426, "Transfer aborted. Data connection closed."); 2795 reply(226, "Abort successful."); 2796 return (-1); 2797 } 2798 if (strcmp(cp, "STAT\r\n") == 0) { 2799 tmpline[0] = '\0'; 2800 if (file_size != -1) 2801 reply(213, "Status: %jd of %jd bytes transferred.", 2802 (intmax_t)byte_count, (intmax_t)file_size); 2803 else 2804 reply(213, "Status: %jd bytes transferred.", 2805 (intmax_t)byte_count); 2806 } 2807 return (0); 2808 } 2809 2810 /* 2811 * Note: a response of 425 is not mentioned as a possible response to 2812 * the PASV command in RFC959. However, it has been blessed as 2813 * a legitimate response by Jon Postel in a telephone conversation 2814 * with Rick Adams on 25 Jan 89. 2815 */ 2816 void 2817 passive(void) 2818 { 2819 int len, on; 2820 char *p, *a; 2821 2822 if (pdata >= 0) /* close old port if one set */ 2823 close(pdata); 2824 2825 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2826 if (pdata < 0) { 2827 perror_reply(425, "Can't open passive connection"); 2828 return; 2829 } 2830 on = 1; 2831 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2832 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2833 2834 (void) seteuid(0); 2835 2836 #ifdef IP_PORTRANGE 2837 if (ctrl_addr.su_family == AF_INET) { 2838 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2839 : IP_PORTRANGE_DEFAULT; 2840 2841 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2842 &on, sizeof(on)) < 0) 2843 goto pasv_error; 2844 } 2845 #endif 2846 #ifdef IPV6_PORTRANGE 2847 if (ctrl_addr.su_family == AF_INET6) { 2848 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2849 : IPV6_PORTRANGE_DEFAULT; 2850 2851 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2852 &on, sizeof(on)) < 0) 2853 goto pasv_error; 2854 } 2855 #endif 2856 2857 pasv_addr = ctrl_addr; 2858 pasv_addr.su_port = 0; 2859 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2860 goto pasv_error; 2861 2862 (void) seteuid(pw->pw_uid); 2863 2864 len = sizeof(pasv_addr); 2865 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2866 goto pasv_error; 2867 if (listen(pdata, 1) < 0) 2868 goto pasv_error; 2869 if (pasv_addr.su_family == AF_INET) 2870 a = (char *) &pasv_addr.su_sin.sin_addr; 2871 else if (pasv_addr.su_family == AF_INET6 && 2872 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2873 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2874 else 2875 goto pasv_error; 2876 2877 p = (char *) &pasv_addr.su_port; 2878 2879 #define UC(b) (((int) b) & 0xff) 2880 2881 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2882 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2883 return; 2884 2885 pasv_error: 2886 (void) seteuid(pw->pw_uid); 2887 (void) close(pdata); 2888 pdata = -1; 2889 perror_reply(425, "Can't open passive connection"); 2890 return; 2891 } 2892 2893 /* 2894 * Long Passive defined in RFC 1639. 2895 * 228 Entering Long Passive Mode 2896 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2897 */ 2898 2899 void 2900 long_passive(char *cmd, int pf) 2901 { 2902 int len, on; 2903 char *p, *a; 2904 2905 if (pdata >= 0) /* close old port if one set */ 2906 close(pdata); 2907 2908 if (pf != PF_UNSPEC) { 2909 if (ctrl_addr.su_family != pf) { 2910 switch (ctrl_addr.su_family) { 2911 case AF_INET: 2912 pf = 1; 2913 break; 2914 case AF_INET6: 2915 pf = 2; 2916 break; 2917 default: 2918 pf = 0; 2919 break; 2920 } 2921 /* 2922 * XXX 2923 * only EPRT/EPSV ready clients will understand this 2924 */ 2925 if (strcmp(cmd, "EPSV") == 0 && pf) { 2926 reply(522, "Network protocol mismatch, " 2927 "use (%d)", pf); 2928 } else 2929 reply(501, "Network protocol mismatch."); /*XXX*/ 2930 2931 return; 2932 } 2933 } 2934 2935 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2936 if (pdata < 0) { 2937 perror_reply(425, "Can't open passive connection"); 2938 return; 2939 } 2940 on = 1; 2941 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2942 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2943 2944 (void) seteuid(0); 2945 2946 pasv_addr = ctrl_addr; 2947 pasv_addr.su_port = 0; 2948 len = pasv_addr.su_len; 2949 2950 #ifdef IP_PORTRANGE 2951 if (ctrl_addr.su_family == AF_INET) { 2952 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2953 : IP_PORTRANGE_DEFAULT; 2954 2955 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2956 &on, sizeof(on)) < 0) 2957 goto pasv_error; 2958 } 2959 #endif 2960 #ifdef IPV6_PORTRANGE 2961 if (ctrl_addr.su_family == AF_INET6) { 2962 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2963 : IPV6_PORTRANGE_DEFAULT; 2964 2965 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2966 &on, sizeof(on)) < 0) 2967 goto pasv_error; 2968 } 2969 #endif 2970 2971 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2972 goto pasv_error; 2973 2974 (void) seteuid(pw->pw_uid); 2975 2976 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2977 goto pasv_error; 2978 if (listen(pdata, 1) < 0) 2979 goto pasv_error; 2980 2981 #define UC(b) (((int) b) & 0xff) 2982 2983 if (strcmp(cmd, "LPSV") == 0) { 2984 p = (char *)&pasv_addr.su_port; 2985 switch (pasv_addr.su_family) { 2986 case AF_INET: 2987 a = (char *) &pasv_addr.su_sin.sin_addr; 2988 v4_reply: 2989 reply(228, 2990 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2991 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2992 2, UC(p[0]), UC(p[1])); 2993 return; 2994 case AF_INET6: 2995 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2996 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2997 goto v4_reply; 2998 } 2999 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3000 reply(228, 3001 "Entering Long Passive Mode " 3002 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3003 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3004 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3005 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3006 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3007 2, UC(p[0]), UC(p[1])); 3008 return; 3009 } 3010 } else if (strcmp(cmd, "EPSV") == 0) { 3011 switch (pasv_addr.su_family) { 3012 case AF_INET: 3013 case AF_INET6: 3014 reply(229, "Entering Extended Passive Mode (|||%d|)", 3015 ntohs(pasv_addr.su_port)); 3016 return; 3017 } 3018 } else { 3019 /* more proper error code? */ 3020 } 3021 3022 pasv_error: 3023 (void) seteuid(pw->pw_uid); 3024 (void) close(pdata); 3025 pdata = -1; 3026 perror_reply(425, "Can't open passive connection"); 3027 return; 3028 } 3029 3030 /* 3031 * Generate unique name for file with basename "local" 3032 * and open the file in order to avoid possible races. 3033 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3034 * Return descriptor to the file, set "name" to its name. 3035 * 3036 * Generates failure reply on error. 3037 */ 3038 static int 3039 guniquefd(char *local, char **name) 3040 { 3041 static char new[MAXPATHLEN]; 3042 struct stat st; 3043 char *cp; 3044 int count; 3045 int fd; 3046 3047 cp = strrchr(local, '/'); 3048 if (cp) 3049 *cp = '\0'; 3050 if (stat(cp ? local : ".", &st) < 0) { 3051 perror_reply(553, cp ? local : "."); 3052 return (-1); 3053 } 3054 if (cp) { 3055 /* 3056 * Let not overwrite dirname with counter suffix. 3057 * -4 is for /nn\0 3058 * In this extreme case dot won't be put in front of suffix. 3059 */ 3060 if (strlen(local) > sizeof(new) - 4) { 3061 reply(553, "Pathname too long."); 3062 return (-1); 3063 } 3064 *cp = '/'; 3065 } 3066 /* -4 is for the .nn<null> we put on the end below */ 3067 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3068 cp = new + strlen(new); 3069 /* 3070 * Don't generate dotfile unless requested explicitly. 3071 * This covers the case when basename gets truncated off 3072 * by buffer size. 3073 */ 3074 if (cp > new && cp[-1] != '/') 3075 *cp++ = '.'; 3076 for (count = 0; count < 100; count++) { 3077 /* At count 0 try unmodified name */ 3078 if (count) 3079 (void)sprintf(cp, "%d", count); 3080 if ((fd = open(count ? new : local, 3081 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3082 *name = count ? new : local; 3083 return (fd); 3084 } 3085 if (errno != EEXIST) { 3086 perror_reply(553, count ? new : local); 3087 return (-1); 3088 } 3089 } 3090 reply(452, "Unique file name cannot be created."); 3091 return (-1); 3092 } 3093 3094 /* 3095 * Format and send reply containing system error number. 3096 */ 3097 void 3098 perror_reply(int code, char *string) 3099 { 3100 3101 reply(code, "%s: %s.", string, strerror(errno)); 3102 } 3103 3104 static char *onefile[] = { 3105 "", 3106 0 3107 }; 3108 3109 void 3110 send_file_list(char *whichf) 3111 { 3112 struct stat st; 3113 DIR *dirp = NULL; 3114 struct dirent *dir; 3115 FILE *dout = NULL; 3116 char **dirlist, *dirname; 3117 int simple = 0; 3118 int freeglob = 0; 3119 glob_t gl; 3120 3121 if (strpbrk(whichf, "~{[*?") != NULL) { 3122 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3123 3124 memset(&gl, 0, sizeof(gl)); 3125 gl.gl_matchc = MAXGLOBARGS; 3126 flags |= GLOB_LIMIT; 3127 freeglob = 1; 3128 if (glob(whichf, flags, 0, &gl)) { 3129 reply(550, "No matching files found."); 3130 goto out; 3131 } else if (gl.gl_pathc == 0) { 3132 errno = ENOENT; 3133 perror_reply(550, whichf); 3134 goto out; 3135 } 3136 dirlist = gl.gl_pathv; 3137 } else { 3138 onefile[0] = whichf; 3139 dirlist = onefile; 3140 simple = 1; 3141 } 3142 3143 while ((dirname = *dirlist++)) { 3144 if (stat(dirname, &st) < 0) { 3145 /* 3146 * If user typed "ls -l", etc, and the client 3147 * used NLST, do what the user meant. 3148 */ 3149 if (dirname[0] == '-' && *dirlist == NULL && 3150 dout == NULL) 3151 retrieve(_PATH_LS " %s", dirname); 3152 else 3153 perror_reply(550, whichf); 3154 goto out; 3155 } 3156 3157 if (S_ISREG(st.st_mode)) { 3158 if (dout == NULL) { 3159 dout = dataconn("file list", -1, "w"); 3160 if (dout == NULL) 3161 goto out; 3162 STARTXFER; 3163 } 3164 START_UNSAFE; 3165 fprintf(dout, "%s%s\n", dirname, 3166 type == TYPE_A ? "\r" : ""); 3167 END_UNSAFE; 3168 if (ferror(dout)) 3169 goto data_err; 3170 byte_count += strlen(dirname) + 3171 (type == TYPE_A ? 2 : 1); 3172 CHECKOOB(goto abrt); 3173 continue; 3174 } else if (!S_ISDIR(st.st_mode)) 3175 continue; 3176 3177 if ((dirp = opendir(dirname)) == NULL) 3178 continue; 3179 3180 while ((dir = readdir(dirp)) != NULL) { 3181 char nbuf[MAXPATHLEN]; 3182 3183 CHECKOOB(goto abrt); 3184 3185 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3186 continue; 3187 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3188 dir->d_namlen == 2) 3189 continue; 3190 3191 snprintf(nbuf, sizeof(nbuf), 3192 "%s/%s", dirname, dir->d_name); 3193 3194 /* 3195 * We have to do a stat to insure it's 3196 * not a directory or special file. 3197 */ 3198 if (simple || (stat(nbuf, &st) == 0 && 3199 S_ISREG(st.st_mode))) { 3200 if (dout == NULL) { 3201 dout = dataconn("file list", -1, "w"); 3202 if (dout == NULL) 3203 goto out; 3204 STARTXFER; 3205 } 3206 START_UNSAFE; 3207 if (nbuf[0] == '.' && nbuf[1] == '/') 3208 fprintf(dout, "%s%s\n", &nbuf[2], 3209 type == TYPE_A ? "\r" : ""); 3210 else 3211 fprintf(dout, "%s%s\n", nbuf, 3212 type == TYPE_A ? "\r" : ""); 3213 END_UNSAFE; 3214 if (ferror(dout)) 3215 goto data_err; 3216 byte_count += strlen(nbuf) + 3217 (type == TYPE_A ? 2 : 1); 3218 CHECKOOB(goto abrt); 3219 } 3220 } 3221 (void) closedir(dirp); 3222 dirp = NULL; 3223 } 3224 3225 if (dout == NULL) 3226 reply(550, "No files found."); 3227 else if (ferror(dout)) 3228 data_err: perror_reply(550, "Data connection"); 3229 else 3230 reply(226, "Transfer complete."); 3231 out: 3232 if (dout) { 3233 ENDXFER; 3234 abrt: 3235 (void) fclose(dout); 3236 data = -1; 3237 pdata = -1; 3238 } 3239 if (dirp) 3240 (void) closedir(dirp); 3241 if (freeglob) { 3242 freeglob = 0; 3243 globfree(&gl); 3244 } 3245 } 3246 3247 void 3248 reapchild(int signo) 3249 { 3250 while (waitpid(-1, NULL, WNOHANG) > 0); 3251 } 3252 3253 #ifdef OLD_SETPROCTITLE 3254 /* 3255 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3256 * Warning, since this is usually started from inetd.conf, it often doesn't 3257 * have much of an environment or arglist to overwrite. 3258 */ 3259 void 3260 setproctitle(const char *fmt, ...) 3261 { 3262 int i; 3263 va_list ap; 3264 char *p, *bp, ch; 3265 char buf[LINE_MAX]; 3266 3267 va_start(ap, fmt); 3268 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3269 3270 /* make ps print our process name */ 3271 p = Argv[0]; 3272 *p++ = '-'; 3273 3274 i = strlen(buf); 3275 if (i > LastArgv - p - 2) { 3276 i = LastArgv - p - 2; 3277 buf[i] = '\0'; 3278 } 3279 bp = buf; 3280 while (ch = *bp++) 3281 if (ch != '\n' && ch != '\r') 3282 *p++ = ch; 3283 while (p < LastArgv) 3284 *p++ = ' '; 3285 } 3286 #endif /* OLD_SETPROCTITLE */ 3287 3288 static void 3289 appendf(char **strp, char *fmt, ...) 3290 { 3291 va_list ap; 3292 char *ostr, *p; 3293 3294 va_start(ap, fmt); 3295 vasprintf(&p, fmt, ap); 3296 va_end(ap); 3297 if (p == NULL) 3298 fatalerror("Ran out of memory."); 3299 if (*strp == NULL) 3300 *strp = p; 3301 else { 3302 ostr = *strp; 3303 asprintf(strp, "%s%s", ostr, p); 3304 if (*strp == NULL) 3305 fatalerror("Ran out of memory."); 3306 free(ostr); 3307 } 3308 } 3309 3310 static void 3311 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3312 { 3313 char *msg = NULL; 3314 char wd[MAXPATHLEN + 1]; 3315 3316 if (logging <= 1) 3317 return; 3318 3319 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3320 strcpy(wd, strerror(errno)); 3321 3322 appendf(&msg, "%s", cmd); 3323 if (file1) 3324 appendf(&msg, " %s", file1); 3325 if (file2) 3326 appendf(&msg, " %s", file2); 3327 if (cnt >= 0) 3328 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3329 appendf(&msg, " (wd: %s", wd); 3330 if (guest || dochroot) 3331 appendf(&msg, "; chrooted"); 3332 appendf(&msg, ")"); 3333 syslog(LOG_INFO, "%s", msg); 3334 free(msg); 3335 } 3336 3337 static void 3338 logxfer(char *name, off_t size, time_t start) 3339 { 3340 char buf[MAXPATHLEN + 1024]; 3341 char path[MAXPATHLEN + 1]; 3342 time_t now; 3343 3344 if (statfd >= 0) { 3345 time(&now); 3346 if (realpath(name, path) == NULL) { 3347 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3348 return; 3349 } 3350 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3351 ctime(&now)+4, ident, remotehost, 3352 path, (intmax_t)size, 3353 (long)(now - start + (now == start))); 3354 write(statfd, buf, strlen(buf)); 3355 } 3356 } 3357 3358 static char * 3359 doublequote(char *s) 3360 { 3361 int n; 3362 char *p, *s2; 3363 3364 for (p = s, n = 0; *p; p++) 3365 if (*p == '"') 3366 n++; 3367 3368 if ((s2 = malloc(p - s + n + 1)) == NULL) 3369 return (NULL); 3370 3371 for (p = s2; *s; s++, p++) { 3372 if ((*p = *s) == '"') 3373 *(++p) = '"'; 3374 } 3375 *p = '\0'; 3376 3377 return (s2); 3378 } 3379 3380 /* setup server socket for specified address family */ 3381 /* if af is PF_UNSPEC more than one socket may be returned */ 3382 /* the returned list is dynamically allocated, so caller needs to free it */ 3383 static int * 3384 socksetup(int af, char *bindname, const char *bindport) 3385 { 3386 struct addrinfo hints, *res, *r; 3387 int error, maxs, *s, *socks; 3388 const int on = 1; 3389 3390 memset(&hints, 0, sizeof(hints)); 3391 hints.ai_flags = AI_PASSIVE; 3392 hints.ai_family = af; 3393 hints.ai_socktype = SOCK_STREAM; 3394 error = getaddrinfo(bindname, bindport, &hints, &res); 3395 if (error) { 3396 syslog(LOG_ERR, "%s", gai_strerror(error)); 3397 if (error == EAI_SYSTEM) 3398 syslog(LOG_ERR, "%s", strerror(errno)); 3399 return NULL; 3400 } 3401 3402 /* Count max number of sockets we may open */ 3403 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3404 ; 3405 socks = malloc((maxs + 1) * sizeof(int)); 3406 if (!socks) { 3407 freeaddrinfo(res); 3408 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3409 return NULL; 3410 } 3411 3412 *socks = 0; /* num of sockets counter at start of array */ 3413 s = socks + 1; 3414 for (r = res; r; r = r->ai_next) { 3415 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3416 if (*s < 0) { 3417 syslog(LOG_DEBUG, "control socket: %m"); 3418 continue; 3419 } 3420 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3421 &on, sizeof(on)) < 0) 3422 syslog(LOG_WARNING, 3423 "control setsockopt (SO_REUSEADDR): %m"); 3424 if (r->ai_family == AF_INET6) { 3425 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3426 &on, sizeof(on)) < 0) 3427 syslog(LOG_WARNING, 3428 "control setsockopt (IPV6_V6ONLY): %m"); 3429 } 3430 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3431 syslog(LOG_DEBUG, "control bind: %m"); 3432 close(*s); 3433 continue; 3434 } 3435 (*socks)++; 3436 s++; 3437 } 3438 3439 if (res) 3440 freeaddrinfo(res); 3441 3442 if (*socks == 0) { 3443 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3444 free(socks); 3445 return NULL; 3446 } 3447 return(socks); 3448 } 3449