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 static const char rcsid[] = 47 "$FreeBSD$"; 48 #endif /* not lint */ 49 50 /* 51 * FTP server. 52 */ 53 #include <sys/param.h> 54 #include <sys/ioctl.h> 55 #include <sys/mman.h> 56 #include <sys/socket.h> 57 #include <sys/stat.h> 58 #include <sys/time.h> 59 #include <sys/wait.h> 60 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/ip.h> 64 #include <netinet/tcp.h> 65 66 #define FTP_NAMES 67 #include <arpa/ftp.h> 68 #include <arpa/inet.h> 69 #include <arpa/telnet.h> 70 71 #include <ctype.h> 72 #include <dirent.h> 73 #include <err.h> 74 #include <errno.h> 75 #include <fcntl.h> 76 #include <glob.h> 77 #include <limits.h> 78 #include <netdb.h> 79 #include <pwd.h> 80 #include <grp.h> 81 #include <opie.h> 82 #include <signal.h> 83 #include <stdio.h> 84 #include <stdlib.h> 85 #include <string.h> 86 #include <syslog.h> 87 #include <time.h> 88 #include <unistd.h> 89 #include <libutil.h> 90 #ifdef LOGIN_CAP 91 #include <login_cap.h> 92 #endif 93 94 #ifdef USE_PAM 95 #include <security/pam_appl.h> 96 #endif 97 98 #include "pathnames.h" 99 #include "extern.h" 100 101 #include <stdarg.h> 102 103 static char version[] = "Version 6.00LS"; 104 #undef main 105 106 extern off_t restart_point; 107 extern char cbuf[]; 108 109 union sockunion ctrl_addr; 110 union sockunion data_source; 111 union sockunion data_dest; 112 union sockunion his_addr; 113 union sockunion pasv_addr; 114 115 int daemon_mode; 116 int data; 117 int dataport; 118 int hostinfo = 1; /* print host-specific info in messages */ 119 int logged_in; 120 struct passwd *pw; 121 char *homedir; 122 int ftpdebug; 123 int timeout = 900; /* timeout after 15 minutes of inactivity */ 124 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 125 int logging; 126 int restricted_data_ports = 1; 127 int paranoid = 1; /* be extra careful about security */ 128 int anon_only = 0; /* Only anonymous ftp allowed */ 129 int guest; 130 int dochroot; 131 int dowtmp = 1; 132 int stats; 133 int statfd = -1; 134 int type; 135 int form; 136 int stru; /* avoid C keyword */ 137 int mode; 138 int usedefault = 1; /* for data transfers */ 139 int pdata = -1; /* for passive mode */ 140 int readonly=0; /* Server is in readonly mode. */ 141 int noepsv=0; /* EPSV command is disabled. */ 142 int noretr=0; /* RETR command is disabled. */ 143 int noguestretr=0; /* RETR command is disabled for anon users. */ 144 int noguestmkd=0; /* MKD command is disabled for anon users. */ 145 int noguestmod=1; /* anon users may not modify existing files. */ 146 147 static volatile sig_atomic_t recvurg; 148 sig_atomic_t transflag; 149 off_t file_size; 150 off_t byte_count; 151 #if !defined(CMASK) || CMASK == 0 152 #undef CMASK 153 #define CMASK 027 154 #endif 155 int defumask = CMASK; /* default umask value */ 156 char tmpline[7]; 157 char *hostname; 158 int epsvall = 0; 159 160 #ifdef VIRTUAL_HOSTING 161 char *ftpuser; 162 163 static struct ftphost { 164 struct ftphost *next; 165 struct addrinfo *hostinfo; 166 char *hostname; 167 char *anonuser; 168 char *statfile; 169 char *welcome; 170 char *loginmsg; 171 } *thishost, *firsthost; 172 173 #endif 174 char remotehost[MAXHOSTNAMELEN]; 175 char *ident = NULL; 176 177 static char ttyline[20]; 178 char *tty = ttyline; /* for klogin */ 179 180 #ifdef USE_PAM 181 static int auth_pam(struct passwd**, const char*); 182 pam_handle_t *pamh = NULL; 183 #endif 184 185 static struct opie opiedata; 186 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 187 static int pwok; 188 189 char *pid_file = NULL; 190 191 /* 192 * Limit number of pathnames that glob can return. 193 * A limit of 0 indicates the number of pathnames is unlimited. 194 */ 195 #define MAXGLOBARGS 16384 196 # 197 198 /* 199 * Timeout intervals for retrying connections 200 * to hosts that don't accept PORT cmds. This 201 * is a kludge, but given the problems with TCP... 202 */ 203 #define SWAITMAX 90 /* wait at most 90 seconds */ 204 #define SWAITINT 5 /* interval between retries */ 205 206 int swaitmax = SWAITMAX; 207 int swaitint = SWAITINT; 208 209 #ifdef SETPROCTITLE 210 #ifdef OLD_SETPROCTITLE 211 char **Argv = NULL; /* pointer to argument vector */ 212 char *LastArgv = NULL; /* end of argv */ 213 #endif /* OLD_SETPROCTITLE */ 214 char proctitle[LINE_MAX]; /* initial part of title */ 215 #endif /* SETPROCTITLE */ 216 217 #define LOGCMD(cmd, file) \ 218 if (logging > 1) \ 219 syslog(LOG_INFO,"%s %s%s", cmd, \ 220 *(file) == '/' ? "" : curdir(), file); 221 #define LOGCMD2(cmd, file1, file2) \ 222 if (logging > 1) \ 223 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 224 *(file1) == '/' ? "" : curdir(), file1, \ 225 *(file2) == '/' ? "" : curdir(), file2); 226 #define LOGBYTES(cmd, file, cnt) \ 227 if (logging > 1) { \ 228 if (cnt == (off_t)-1) \ 229 syslog(LOG_INFO,"%s %s%s", cmd, \ 230 *(file) == '/' ? "" : curdir(), file); \ 231 else \ 232 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 233 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 234 } 235 236 #ifdef VIRTUAL_HOSTING 237 static void inithosts(void); 238 static void selecthost(union sockunion *); 239 #endif 240 static void ack(char *); 241 static void sigurg(int); 242 static void myoob(void); 243 static int checkuser(char *, char *, int, char **); 244 static FILE *dataconn(char *, off_t, char *); 245 static void dolog(struct sockaddr *); 246 static char *curdir(void); 247 static void end_login(void); 248 static FILE *getdatasock(char *); 249 static int guniquefd(char *, char **); 250 static void lostconn(int); 251 static void sigquit(int); 252 static int receive_data(FILE *, FILE *); 253 static int send_data(FILE *, FILE *, off_t, off_t, int); 254 static struct passwd * 255 sgetpwnam(char *); 256 static char *sgetsave(char *); 257 static void reapchild(int); 258 static void logxfer(char *, off_t, time_t); 259 static char *doublequote(char *); 260 static int *socksetup(int, char *, const char *); 261 262 static char * 263 curdir(void) 264 { 265 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 266 267 if (getcwd(path, sizeof(path)-2) == NULL) 268 return (""); 269 if (path[1] != '\0') /* special case for root dir. */ 270 strcat(path, "/"); 271 /* For guest account, skip / since it's chrooted */ 272 return (guest ? path+1 : path); 273 } 274 275 int 276 main(int argc, char *argv[], char **envp) 277 { 278 int addrlen, ch, on = 1, tos; 279 char *cp, line[LINE_MAX]; 280 FILE *fd; 281 int error; 282 char *bindname = NULL; 283 const char *bindport = "ftp"; 284 int family = AF_UNSPEC; 285 struct sigaction sa; 286 287 tzset(); /* in case no timezone database in ~ftp */ 288 sigemptyset(&sa.sa_mask); 289 sa.sa_flags = SA_RESTART; 290 291 #ifdef OLD_SETPROCTITLE 292 /* 293 * Save start and extent of argv for setproctitle. 294 */ 295 Argv = argv; 296 while (*envp) 297 envp++; 298 LastArgv = envp[-1] + strlen(envp[-1]); 299 #endif /* OLD_SETPROCTITLE */ 300 301 302 while ((ch = getopt(argc, argv, 303 "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 304 switch (ch) { 305 case '4': 306 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 307 break; 308 309 case '6': 310 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 311 break; 312 313 case 'a': 314 bindname = optarg; 315 break; 316 317 case 'A': 318 anon_only = 1; 319 break; 320 321 case 'd': 322 ftpdebug++; 323 break; 324 325 case 'D': 326 daemon_mode++; 327 break; 328 329 case 'E': 330 noepsv = 1; 331 break; 332 333 case 'h': 334 hostinfo = 0; 335 break; 336 337 case 'l': 338 logging++; /* > 1 == extra logging */ 339 break; 340 341 case 'm': 342 noguestmod = 0; 343 break; 344 345 case 'M': 346 noguestmkd = 1; 347 break; 348 349 case 'o': 350 noretr = 1; 351 break; 352 353 case 'O': 354 noguestretr = 1; 355 break; 356 357 case 'p': 358 pid_file = optarg; 359 break; 360 361 case 'P': 362 bindport = optarg; 363 break; 364 365 case 'r': 366 readonly = 1; 367 break; 368 369 case 'R': 370 paranoid = 0; 371 break; 372 373 case 'S': 374 stats++; 375 break; 376 377 case 't': 378 timeout = atoi(optarg); 379 if (maxtimeout < timeout) 380 maxtimeout = timeout; 381 break; 382 383 case 'T': 384 maxtimeout = atoi(optarg); 385 if (timeout > maxtimeout) 386 timeout = maxtimeout; 387 break; 388 389 case 'u': 390 { 391 long val = 0; 392 393 val = strtol(optarg, &optarg, 8); 394 if (*optarg != '\0' || val < 0) 395 warnx("bad value for -u"); 396 else 397 defumask = val; 398 break; 399 } 400 case 'U': 401 restricted_data_ports = 0; 402 break; 403 404 case 'v': 405 ftpdebug++; 406 break; 407 408 case 'W': 409 dowtmp = 0; 410 break; 411 412 default: 413 warnx("unknown flag -%c ignored", optopt); 414 break; 415 } 416 } 417 418 #ifdef VIRTUAL_HOSTING 419 inithosts(); 420 #endif 421 (void) freopen(_PATH_DEVNULL, "w", stderr); 422 423 /* 424 * LOG_NDELAY sets up the logging connection immediately, 425 * necessary for anonymous ftp's that chroot and can't do it later. 426 */ 427 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 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 errx(1, "%s: file locked", pid_file); 476 else 477 err(1, "%s", pid_file); 478 } 479 snprintf(buf, sizeof(buf), 480 "%lu\n", (unsigned long) getpid()); 481 if (write(fd, buf, strlen(buf)) < 0) 482 err(1, "%s: write", pid_file); 483 /* Leave the pid file open and locked */ 484 } 485 /* 486 * Loop forever accepting connection requests and forking off 487 * children to handle them. 488 */ 489 while (1) { 490 FD_COPY(&defreadfds, &readfds); 491 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 492 if (nfds <= 0) { 493 if (nfds < 0 && errno != EINTR) 494 syslog(LOG_WARNING, "select: %m"); 495 continue; 496 } 497 498 pid = -1; 499 for (i = 1; i <= *ctl_sock; i++) 500 if (FD_ISSET(ctl_sock[i], &readfds)) { 501 addrlen = sizeof(his_addr); 502 fd = accept(ctl_sock[i], 503 (struct sockaddr *)&his_addr, 504 &addrlen); 505 if ((pid = fork()) == 0) { 506 /* child */ 507 (void) dup2(fd, 0); 508 (void) dup2(fd, 1); 509 close(ctl_sock[i]); 510 } else 511 close(fd); 512 } 513 if (pid == 0) 514 break; 515 } 516 } else { 517 addrlen = sizeof(his_addr); 518 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 519 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 520 exit(1); 521 } 522 } 523 524 sa.sa_handler = SIG_DFL; 525 (void)sigaction(SIGCHLD, &sa, NULL); 526 527 sa.sa_handler = sigurg; 528 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 529 (void)sigaction(SIGURG, &sa, NULL); 530 531 sigfillset(&sa.sa_mask); /* block all signals in handler */ 532 sa.sa_flags = SA_RESTART; 533 sa.sa_handler = sigquit; 534 (void)sigaction(SIGHUP, &sa, NULL); 535 (void)sigaction(SIGINT, &sa, NULL); 536 (void)sigaction(SIGQUIT, &sa, NULL); 537 (void)sigaction(SIGTERM, &sa, NULL); 538 539 sa.sa_handler = lostconn; 540 (void)sigaction(SIGPIPE, &sa, NULL); 541 542 addrlen = sizeof(ctrl_addr); 543 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 544 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 545 exit(1); 546 } 547 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 548 #ifdef VIRTUAL_HOSTING 549 /* select our identity from virtual host table */ 550 selecthost(&ctrl_addr); 551 #endif 552 #ifdef IP_TOS 553 if (ctrl_addr.su_family == AF_INET) 554 { 555 tos = IPTOS_LOWDELAY; 556 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 557 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 558 } 559 #endif 560 /* 561 * Disable Nagle on the control channel so that we don't have to wait 562 * for peer's ACK before issuing our next reply. 563 */ 564 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 565 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 566 567 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 568 569 /* set this here so klogin can use it... */ 570 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 571 572 /* Try to handle urgent data inline */ 573 #ifdef SO_OOBINLINE 574 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 575 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 576 #endif 577 578 #ifdef F_SETOWN 579 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 580 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 581 #endif 582 dolog((struct sockaddr *)&his_addr); 583 /* 584 * Set up default state 585 */ 586 data = -1; 587 type = TYPE_A; 588 form = FORM_N; 589 stru = STRU_F; 590 mode = MODE_S; 591 tmpline[0] = '\0'; 592 593 /* If logins are disabled, print out the message. */ 594 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 595 while (fgets(line, sizeof(line), fd) != NULL) { 596 if ((cp = strchr(line, '\n')) != NULL) 597 *cp = '\0'; 598 lreply(530, "%s", line); 599 } 600 (void) fflush(stdout); 601 (void) fclose(fd); 602 reply(530, "System not available."); 603 exit(0); 604 } 605 #ifdef VIRTUAL_HOSTING 606 fd = fopen(thishost->welcome, "r"); 607 #else 608 fd = fopen(_PATH_FTPWELCOME, "r"); 609 #endif 610 if (fd != NULL) { 611 while (fgets(line, sizeof(line), fd) != NULL) { 612 if ((cp = strchr(line, '\n')) != NULL) 613 *cp = '\0'; 614 lreply(220, "%s", line); 615 } 616 (void) fflush(stdout); 617 (void) fclose(fd); 618 /* reply(220,) must follow */ 619 } 620 #ifndef VIRTUAL_HOSTING 621 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 622 fatalerror("Ran out of memory."); 623 (void) gethostname(hostname, MAXHOSTNAMELEN - 1); 624 hostname[MAXHOSTNAMELEN - 1] = '\0'; 625 #endif 626 if (hostinfo) 627 reply(220, "%s FTP server (%s) ready.", hostname, version); 628 else 629 reply(220, "FTP server ready."); 630 for (;;) 631 (void) yyparse(); 632 /* NOTREACHED */ 633 } 634 635 static void 636 lostconn(int signo) 637 { 638 639 if (ftpdebug) 640 syslog(LOG_DEBUG, "lost connection"); 641 dologout(1); 642 } 643 644 static void 645 sigquit(int signo) 646 { 647 648 syslog(LOG_ERR, "got signal %d", signo); 649 dologout(1); 650 } 651 652 #ifdef VIRTUAL_HOSTING 653 /* 654 * read in virtual host tables (if they exist) 655 */ 656 657 static void 658 inithosts(void) 659 { 660 int insert; 661 size_t len; 662 FILE *fp; 663 char *cp, *mp, *line; 664 char *hostname; 665 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 666 struct ftphost *hrp, *lhrp; 667 struct addrinfo hints, *res, *ai; 668 669 /* 670 * Fill in the default host information 671 */ 672 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 673 fatalerror("Ran out of memory."); 674 if (gethostname(hostname, MAXHOSTNAMELEN) < 0) 675 hostname[0] = '\0'; 676 hostname[MAXHOSTNAMELEN - 1] = '\0'; 677 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 678 fatalerror("Ran out of memory."); 679 hrp->hostname = hostname; 680 hrp->hostinfo = NULL; 681 682 memset(&hints, 0, sizeof(hints)); 683 hints.ai_flags = AI_CANONNAME; 684 hints.ai_family = AF_UNSPEC; 685 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 686 hrp->hostinfo = res; 687 hrp->statfile = _PATH_FTPDSTATFILE; 688 hrp->welcome = _PATH_FTPWELCOME; 689 hrp->loginmsg = _PATH_FTPLOGINMESG; 690 hrp->anonuser = "ftp"; 691 hrp->next = NULL; 692 thishost = firsthost = lhrp = hrp; 693 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 694 int addrsize, gothost; 695 void *addr; 696 struct hostent *hp; 697 698 while ((line = fgetln(fp, &len)) != NULL) { 699 int i, hp_error; 700 701 /* skip comments */ 702 if (line[0] == '#') 703 continue; 704 if (line[len - 1] == '\n') { 705 line[len - 1] = '\0'; 706 mp = NULL; 707 } else { 708 if ((mp = malloc(len + 1)) == NULL) 709 fatalerror("Ran out of memory."); 710 memcpy(mp, line, len); 711 mp[len] = '\0'; 712 line = mp; 713 } 714 cp = strtok(line, " \t"); 715 /* skip empty lines */ 716 if (cp == NULL) 717 goto nextline; 718 vhost = cp; 719 720 /* set defaults */ 721 anonuser = "ftp"; 722 statfile = _PATH_FTPDSTATFILE; 723 welcome = _PATH_FTPWELCOME; 724 loginmsg = _PATH_FTPLOGINMESG; 725 726 /* 727 * Preparse the line so we can use its info 728 * for all the addresses associated with 729 * the virtual host name. 730 * Field 0, the virtual host name, is special: 731 * it's already parsed off and will be strdup'ed 732 * later, after we know its canonical form. 733 */ 734 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 735 if (*cp != '-' && (cp = strdup(cp))) 736 switch (i) { 737 case 1: /* anon user permissions */ 738 anonuser = cp; 739 break; 740 case 2: /* statistics file */ 741 statfile = cp; 742 break; 743 case 3: /* welcome message */ 744 welcome = cp; 745 break; 746 case 4: /* login message */ 747 loginmsg = cp; 748 break; 749 default: /* programming error */ 750 abort(); 751 /* NOTREACHED */ 752 } 753 754 hints.ai_flags = 0; 755 hints.ai_family = AF_UNSPEC; 756 hints.ai_flags = AI_PASSIVE; 757 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 758 goto nextline; 759 for (ai = res; ai != NULL && ai->ai_addr != NULL; 760 ai = ai->ai_next) { 761 762 gothost = 0; 763 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 764 struct addrinfo *hi; 765 766 for (hi = hrp->hostinfo; hi != NULL; 767 hi = hi->ai_next) 768 if (hi->ai_addrlen == ai->ai_addrlen && 769 memcmp(hi->ai_addr, 770 ai->ai_addr, 771 ai->ai_addr->sa_len) == 0) { 772 gothost++; 773 break; 774 } 775 if (gothost) 776 break; 777 } 778 if (hrp == NULL) { 779 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 780 goto nextline; 781 hrp->hostname = NULL; 782 insert = 1; 783 } else { 784 if (hrp->hostinfo && hrp->hostinfo != res) 785 freeaddrinfo(hrp->hostinfo); 786 insert = 0; /* host already in the chain */ 787 } 788 hrp->hostinfo = res; 789 790 /* 791 * determine hostname to use. 792 * force defined name if there is a valid alias 793 * otherwise fallback to primary hostname 794 */ 795 /* XXX: getaddrinfo() can't do alias check */ 796 switch(hrp->hostinfo->ai_family) { 797 case AF_INET: 798 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 799 addrsize = sizeof(struct in_addr); 800 break; 801 case AF_INET6: 802 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 803 addrsize = sizeof(struct in6_addr); 804 break; 805 default: 806 /* should not reach here */ 807 freeaddrinfo(hrp->hostinfo); 808 if (insert) 809 free(hrp); /*not in chain, can free*/ 810 else 811 hrp->hostinfo = NULL; /*mark as blank*/ 812 goto nextline; 813 /* NOTREACHED */ 814 } 815 if ((hp = getipnodebyaddr(addr, addrsize, 816 hrp->hostinfo->ai_family, 817 &hp_error)) != NULL) { 818 if (strcmp(vhost, hp->h_name) != 0) { 819 if (hp->h_aliases == NULL) 820 vhost = hp->h_name; 821 else { 822 i = 0; 823 while (hp->h_aliases[i] && 824 strcmp(vhost, hp->h_aliases[i]) != 0) 825 ++i; 826 if (hp->h_aliases[i] == NULL) 827 vhost = hp->h_name; 828 } 829 } 830 } 831 if (hrp->hostname && 832 strcmp(hrp->hostname, vhost) != 0) { 833 free(hrp->hostname); 834 hrp->hostname = NULL; 835 } 836 if (hrp->hostname == NULL && 837 (hrp->hostname = strdup(vhost)) == NULL) { 838 freeaddrinfo(hrp->hostinfo); 839 hrp->hostinfo = NULL; /* mark as blank */ 840 if (hp) 841 freehostent(hp); 842 goto nextline; 843 } 844 hrp->anonuser = anonuser; 845 hrp->statfile = statfile; 846 hrp->welcome = welcome; 847 hrp->loginmsg = loginmsg; 848 if (insert) { 849 hrp->next = NULL; 850 lhrp->next = hrp; 851 lhrp = hrp; 852 } 853 if (hp) 854 freehostent(hp); 855 } 856 nextline: 857 if (mp) 858 free(mp); 859 } 860 (void) fclose(fp); 861 } 862 } 863 864 static void 865 selecthost(union sockunion *su) 866 { 867 struct ftphost *hrp; 868 u_int16_t port; 869 #ifdef INET6 870 struct in6_addr *mapped_in6 = NULL; 871 #endif 872 struct addrinfo *hi; 873 874 #ifdef INET6 875 /* 876 * XXX IPv4 mapped IPv6 addr consideraton, 877 * specified in rfc2373. 878 */ 879 if (su->su_family == AF_INET6 && 880 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 881 mapped_in6 = &su->su_sin6.sin6_addr; 882 #endif 883 884 hrp = thishost = firsthost; /* default */ 885 port = su->su_port; 886 su->su_port = 0; 887 while (hrp != NULL) { 888 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 889 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 890 thishost = hrp; 891 break; 892 } 893 #ifdef INET6 894 /* XXX IPv4 mapped IPv6 addr consideraton */ 895 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 896 (memcmp(&mapped_in6->s6_addr[12], 897 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 898 sizeof(struct in_addr)) == 0)) { 899 thishost = hrp; 900 break; 901 } 902 #endif 903 } 904 hrp = hrp->next; 905 } 906 su->su_port = port; 907 /* setup static variables as appropriate */ 908 hostname = thishost->hostname; 909 ftpuser = thishost->anonuser; 910 } 911 #endif 912 913 /* 914 * Helper function for sgetpwnam(). 915 */ 916 static char * 917 sgetsave(char *s) 918 { 919 char *new = malloc((unsigned) strlen(s) + 1); 920 921 if (new == NULL) { 922 perror_reply(421, "Local resource failure: malloc"); 923 dologout(1); 924 /* NOTREACHED */ 925 } 926 (void) strcpy(new, s); 927 return (new); 928 } 929 930 /* 931 * Save the result of a getpwnam. Used for USER command, since 932 * the data returned must not be clobbered by any other command 933 * (e.g., globbing). 934 */ 935 static struct passwd * 936 sgetpwnam(char *name) 937 { 938 static struct passwd save; 939 struct passwd *p; 940 941 if ((p = getpwnam(name)) == NULL) 942 return (p); 943 if (save.pw_name) { 944 free(save.pw_name); 945 free(save.pw_passwd); 946 free(save.pw_gecos); 947 free(save.pw_dir); 948 free(save.pw_shell); 949 } 950 save = *p; 951 save.pw_name = sgetsave(p->pw_name); 952 save.pw_passwd = sgetsave(p->pw_passwd); 953 save.pw_gecos = sgetsave(p->pw_gecos); 954 save.pw_dir = sgetsave(p->pw_dir); 955 save.pw_shell = sgetsave(p->pw_shell); 956 return (&save); 957 } 958 959 static int login_attempts; /* number of failed login attempts */ 960 static int askpasswd; /* had user command, ask for passwd */ 961 static char curname[MAXLOGNAME]; /* current USER name */ 962 963 /* 964 * USER command. 965 * Sets global passwd pointer pw if named account exists and is acceptable; 966 * sets askpasswd if a PASS command is expected. If logged in previously, 967 * need to reset state. If name is "ftp" or "anonymous", the name is not in 968 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 969 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 970 * requesting login privileges. Disallow anyone who does not have a standard 971 * shell as returned by getusershell(). Disallow anyone mentioned in the file 972 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 973 */ 974 void 975 user(char *name) 976 { 977 char *cp, *shell; 978 979 if (logged_in) { 980 if (guest) { 981 reply(530, "Can't change user from guest login."); 982 return; 983 } else if (dochroot) { 984 reply(530, "Can't change user from chroot user."); 985 return; 986 } 987 end_login(); 988 } 989 990 guest = 0; 991 #ifdef VIRTUAL_HOSTING 992 pw = sgetpwnam(thishost->anonuser); 993 #else 994 pw = sgetpwnam("ftp"); 995 #endif 996 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 997 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 998 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 999 reply(530, "User %s access denied.", name); 1000 else if (pw != NULL) { 1001 guest = 1; 1002 askpasswd = 1; 1003 reply(331, 1004 "Guest login ok, send your email address as password."); 1005 } else 1006 reply(530, "User %s unknown.", name); 1007 if (!askpasswd && logging) 1008 syslog(LOG_NOTICE, 1009 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1010 return; 1011 } 1012 if (anon_only != 0) { 1013 reply(530, "Sorry, only anonymous ftp allowed."); 1014 return; 1015 } 1016 1017 if ((pw = sgetpwnam(name))) { 1018 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1019 shell = _PATH_BSHELL; 1020 setusershell(); 1021 while ((cp = getusershell()) != NULL) 1022 if (strcmp(cp, shell) == 0) 1023 break; 1024 endusershell(); 1025 1026 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1027 reply(530, "User %s access denied.", name); 1028 if (logging) 1029 syslog(LOG_NOTICE, 1030 "FTP LOGIN REFUSED FROM %s, %s", 1031 remotehost, name); 1032 pw = (struct passwd *) NULL; 1033 return; 1034 } 1035 } 1036 if (logging) 1037 strncpy(curname, name, sizeof(curname)-1); 1038 1039 pwok = 0; 1040 #ifdef USE_PAM 1041 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1042 #endif 1043 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1044 pwok = (pw != NULL) && 1045 opieaccessfile(remotehost) && 1046 opiealways(pw->pw_dir); 1047 reply(331, "Response to %s %s for %s.", 1048 opieprompt, pwok ? "requested" : "required", name); 1049 } else { 1050 pwok = 1; 1051 reply(331, "Password required for %s.", name); 1052 } 1053 askpasswd = 1; 1054 /* 1055 * Delay before reading passwd after first failed 1056 * attempt to slow down passwd-guessing programs. 1057 */ 1058 if (login_attempts) 1059 sleep((unsigned) login_attempts); 1060 } 1061 1062 /* 1063 * Check if a user is in the file "fname", 1064 * return a pointer to a malloc'd string with the rest 1065 * of the matching line in "residue" if not NULL. 1066 */ 1067 static int 1068 checkuser(char *fname, char *name, int pwset, char **residue) 1069 { 1070 FILE *fd; 1071 int found = 0; 1072 size_t len; 1073 char *line, *mp, *p; 1074 1075 if ((fd = fopen(fname, "r")) != NULL) { 1076 while (!found && (line = fgetln(fd, &len)) != NULL) { 1077 /* skip comments */ 1078 if (line[0] == '#') 1079 continue; 1080 if (line[len - 1] == '\n') { 1081 line[len - 1] = '\0'; 1082 mp = NULL; 1083 } else { 1084 if ((mp = malloc(len + 1)) == NULL) 1085 fatalerror("Ran out of memory."); 1086 memcpy(mp, line, len); 1087 mp[len] = '\0'; 1088 line = mp; 1089 } 1090 /* avoid possible leading and trailing whitespace */ 1091 p = strtok(line, " \t"); 1092 /* skip empty lines */ 1093 if (p == NULL) 1094 goto nextline; 1095 /* 1096 * if first chr is '@', check group membership 1097 */ 1098 if (p[0] == '@') { 1099 int i = 0; 1100 struct group *grp; 1101 1102 if (p[1] == '\0') /* single @ matches anyone */ 1103 found = 1; 1104 else { 1105 if ((grp = getgrnam(p+1)) == NULL) 1106 goto nextline; 1107 /* 1108 * Check user's default group 1109 */ 1110 if (pwset && grp->gr_gid == pw->pw_gid) 1111 found = 1; 1112 /* 1113 * Check supplementary groups 1114 */ 1115 while (!found && grp->gr_mem[i]) 1116 found = strcmp(name, 1117 grp->gr_mem[i++]) 1118 == 0; 1119 } 1120 } 1121 /* 1122 * Otherwise, just check for username match 1123 */ 1124 else 1125 found = strcmp(p, name) == 0; 1126 /* 1127 * Save the rest of line to "residue" if matched 1128 */ 1129 if (found && residue) { 1130 if ((p = strtok(NULL, "")) != NULL) 1131 p += strspn(p, " \t"); 1132 if (p && *p) { 1133 if ((*residue = strdup(p)) == NULL) 1134 fatalerror("Ran out of memory."); 1135 } else 1136 *residue = NULL; 1137 } 1138 nextline: 1139 if (mp) 1140 free(mp); 1141 } 1142 (void) fclose(fd); 1143 } 1144 return (found); 1145 } 1146 1147 /* 1148 * Terminate login as previous user, if any, resetting state; 1149 * used when USER command is given or login fails. 1150 */ 1151 static void 1152 end_login(void) 1153 { 1154 #ifdef USE_PAM 1155 int e; 1156 #endif 1157 1158 (void) seteuid((uid_t)0); 1159 if (logged_in && dowtmp) 1160 ftpd_logwtmp(ttyline, "", NULL); 1161 pw = NULL; 1162 #ifdef LOGIN_CAP 1163 setusercontext(NULL, getpwuid(0), (uid_t)0, 1164 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1165 LOGIN_SETMAC); 1166 #endif 1167 #ifdef USE_PAM 1168 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1169 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1170 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1171 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1172 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1173 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1174 pamh = NULL; 1175 #endif 1176 logged_in = 0; 1177 guest = 0; 1178 dochroot = 0; 1179 } 1180 1181 #ifdef USE_PAM 1182 1183 /* 1184 * the following code is stolen from imap-uw PAM authentication module and 1185 * login.c 1186 */ 1187 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1188 1189 struct cred_t { 1190 const char *uname; /* user name */ 1191 const char *pass; /* password */ 1192 }; 1193 typedef struct cred_t cred_t; 1194 1195 static int 1196 auth_conv(int num_msg, const struct pam_message **msg, 1197 struct pam_response **resp, void *appdata) 1198 { 1199 int i; 1200 cred_t *cred = (cred_t *) appdata; 1201 struct pam_response *reply; 1202 1203 reply = calloc(num_msg, sizeof *reply); 1204 if (reply == NULL) 1205 return PAM_BUF_ERR; 1206 1207 for (i = 0; i < num_msg; i++) { 1208 switch (msg[i]->msg_style) { 1209 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1210 reply[i].resp_retcode = PAM_SUCCESS; 1211 reply[i].resp = COPY_STRING(cred->uname); 1212 /* PAM frees resp. */ 1213 break; 1214 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1215 reply[i].resp_retcode = PAM_SUCCESS; 1216 reply[i].resp = COPY_STRING(cred->pass); 1217 /* PAM frees resp. */ 1218 break; 1219 case PAM_TEXT_INFO: 1220 case PAM_ERROR_MSG: 1221 reply[i].resp_retcode = PAM_SUCCESS; 1222 reply[i].resp = NULL; 1223 break; 1224 default: /* unknown message style */ 1225 free(reply); 1226 return PAM_CONV_ERR; 1227 } 1228 } 1229 1230 *resp = reply; 1231 return PAM_SUCCESS; 1232 } 1233 1234 /* 1235 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1236 * authenticated, or 1 if not authenticated. If some sort of PAM system 1237 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1238 * function returns -1. This can be used as an indication that we should 1239 * fall back to a different authentication mechanism. 1240 */ 1241 static int 1242 auth_pam(struct passwd **ppw, const char *pass) 1243 { 1244 pam_handle_t *pamh = NULL; 1245 const char *tmpl_user; 1246 const void *item; 1247 int rval; 1248 int e; 1249 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1250 struct pam_conv conv = { &auth_conv, &auth_cred }; 1251 1252 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1253 if (e != PAM_SUCCESS) { 1254 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e)); 1255 return -1; 1256 } 1257 1258 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1259 if (e != PAM_SUCCESS) { 1260 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1261 pam_strerror(pamh, e)); 1262 return -1; 1263 } 1264 1265 e = pam_authenticate(pamh, 0); 1266 switch (e) { 1267 case PAM_SUCCESS: 1268 /* 1269 * With PAM we support the concept of a "template" 1270 * user. The user enters a login name which is 1271 * authenticated by PAM, usually via a remote service 1272 * such as RADIUS or TACACS+. If authentication 1273 * succeeds, a different but related "template" name 1274 * is used for setting the credentials, shell, and 1275 * home directory. The name the user enters need only 1276 * exist on the remote authentication server, but the 1277 * template name must be present in the local password 1278 * database. 1279 * 1280 * This is supported by two various mechanisms in the 1281 * individual modules. However, from the application's 1282 * point of view, the template user is always passed 1283 * back as a changed value of the PAM_USER item. 1284 */ 1285 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1286 PAM_SUCCESS) { 1287 tmpl_user = (const char *) item; 1288 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1289 *ppw = getpwnam(tmpl_user); 1290 } else 1291 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1292 pam_strerror(pamh, e)); 1293 rval = 0; 1294 break; 1295 1296 case PAM_AUTH_ERR: 1297 case PAM_USER_UNKNOWN: 1298 case PAM_MAXTRIES: 1299 rval = 1; 1300 break; 1301 1302 default: 1303 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1304 rval = -1; 1305 break; 1306 } 1307 1308 if (rval == 0) { 1309 e = pam_acct_mgmt(pamh, 0); 1310 if (e == PAM_NEW_AUTHTOK_REQD) { 1311 e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); 1312 if (e != PAM_SUCCESS) { 1313 syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); 1314 rval = 1; 1315 } 1316 } else if (e != PAM_SUCCESS) { 1317 rval = 1; 1318 } 1319 } 1320 1321 if (rval != 0) { 1322 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1323 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1324 } 1325 pamh = NULL; 1326 } 1327 return rval; 1328 } 1329 1330 #endif /* USE_PAM */ 1331 1332 void 1333 pass(char *passwd) 1334 { 1335 int rval; 1336 FILE *fd; 1337 #ifdef LOGIN_CAP 1338 login_cap_t *lc = NULL; 1339 #endif 1340 #ifdef USE_PAM 1341 int e; 1342 #endif 1343 char *chrootdir; 1344 char *residue = NULL; 1345 char *xpasswd; 1346 1347 if (logged_in || askpasswd == 0) { 1348 reply(503, "Login with USER first."); 1349 return; 1350 } 1351 askpasswd = 0; 1352 if (!guest) { /* "ftp" is only account allowed no password */ 1353 if (pw == NULL) { 1354 rval = 1; /* failure below */ 1355 goto skip; 1356 } 1357 #ifdef USE_PAM 1358 rval = auth_pam(&pw, passwd); 1359 if (rval >= 0) { 1360 opieunlock(); 1361 goto skip; 1362 } 1363 #endif 1364 if (opieverify(&opiedata, passwd) == 0) 1365 xpasswd = pw->pw_passwd; 1366 else if (pwok) { 1367 xpasswd = crypt(passwd, pw->pw_passwd); 1368 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1369 xpasswd = ":"; 1370 } else { 1371 rval = 1; 1372 goto skip; 1373 } 1374 rval = strcmp(pw->pw_passwd, xpasswd); 1375 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1376 rval = 1; /* failure */ 1377 skip: 1378 /* 1379 * If rval == 1, the user failed the authentication check 1380 * above. If rval == 0, either PAM or local authentication 1381 * succeeded. 1382 */ 1383 if (rval) { 1384 reply(530, "Login incorrect."); 1385 if (logging) { 1386 syslog(LOG_NOTICE, 1387 "FTP LOGIN FAILED FROM %s", 1388 remotehost); 1389 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1390 "FTP LOGIN FAILED FROM %s, %s", 1391 remotehost, curname); 1392 } 1393 pw = NULL; 1394 if (login_attempts++ >= 5) { 1395 syslog(LOG_NOTICE, 1396 "repeated login failures from %s", 1397 remotehost); 1398 exit(0); 1399 } 1400 return; 1401 } 1402 } 1403 login_attempts = 0; /* this time successful */ 1404 if (setegid((gid_t)pw->pw_gid) < 0) { 1405 reply(550, "Can't set gid."); 1406 return; 1407 } 1408 /* May be overridden by login.conf */ 1409 (void) umask(defumask); 1410 #ifdef LOGIN_CAP 1411 if ((lc = login_getpwclass(pw)) != NULL) { 1412 char remote_ip[MAXHOSTNAMELEN]; 1413 1414 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1415 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1416 NI_NUMERICHOST); 1417 remote_ip[sizeof(remote_ip) - 1] = 0; 1418 if (!auth_hostok(lc, remotehost, remote_ip)) { 1419 syslog(LOG_INFO|LOG_AUTH, 1420 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1421 pw->pw_name); 1422 reply(530, "Permission denied.\n"); 1423 pw = NULL; 1424 return; 1425 } 1426 if (!auth_timeok(lc, time(NULL))) { 1427 reply(530, "Login not available right now.\n"); 1428 pw = NULL; 1429 return; 1430 } 1431 } 1432 setusercontext(lc, pw, (uid_t)0, 1433 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1434 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1435 #else 1436 setlogin(pw->pw_name); 1437 (void) initgroups(pw->pw_name, pw->pw_gid); 1438 #endif 1439 1440 #ifdef USE_PAM 1441 if (pamh) { 1442 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1443 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1444 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1445 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1446 } 1447 } 1448 #endif 1449 1450 /* open wtmp before chroot */ 1451 if (dowtmp) 1452 ftpd_logwtmp(ttyline, pw->pw_name, 1453 (struct sockaddr *)&his_addr); 1454 logged_in = 1; 1455 1456 if (guest && stats && statfd < 0) 1457 #ifdef VIRTUAL_HOSTING 1458 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1459 #else 1460 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1461 #endif 1462 if (statfd < 0) 1463 stats = 0; 1464 1465 dochroot = 1466 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1467 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1468 || login_getcapbool(lc, "ftp-chroot", 0) 1469 #endif 1470 ; 1471 chrootdir = NULL; 1472 /* 1473 * For a chrooted local user, 1474 * a) see whether ftpchroot(5) specifies a chroot directory, 1475 * b) extract the directory pathname from the line, 1476 * c) expand it to the absolute pathname if necessary. 1477 */ 1478 if (dochroot && residue && 1479 (chrootdir = strtok(residue, " \t")) != NULL) { 1480 if (chrootdir[0] != '/') 1481 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1482 else 1483 chrootdir = strdup(chrootdir); /* so it can be freed */ 1484 if (chrootdir == NULL) 1485 fatalerror("Ran out of memory."); 1486 } 1487 if (guest || dochroot) { 1488 /* 1489 * If no chroot directory set yet, use the login directory. 1490 * Copy it so it can be modified while pw->pw_dir stays intact. 1491 */ 1492 if (chrootdir == NULL && 1493 (chrootdir = strdup(pw->pw_dir)) == NULL) 1494 fatalerror("Ran out of memory."); 1495 /* 1496 * Check for the "/chroot/./home" syntax, 1497 * separate the chroot and home directory pathnames. 1498 */ 1499 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1500 *(homedir++) = '\0'; /* wipe '/' */ 1501 homedir++; /* skip '.' */ 1502 /* so chrootdir can be freed later */ 1503 if ((homedir = strdup(homedir)) == NULL) 1504 fatalerror("Ran out of memory."); 1505 } else { 1506 /* 1507 * We MUST do a chdir() after the chroot. Otherwise 1508 * the old current directory will be accessible as "." 1509 * outside the new root! 1510 */ 1511 homedir = "/"; 1512 } 1513 /* 1514 * Finally, do chroot() 1515 */ 1516 if (chroot(chrootdir) < 0) { 1517 reply(550, "Can't change root."); 1518 goto bad; 1519 } 1520 } else /* real user w/o chroot */ 1521 homedir = pw->pw_dir; 1522 /* 1523 * Set euid *before* doing chdir() so 1524 * a) the user won't be carried to a directory that he couldn't reach 1525 * on his own due to no permission to upper path components, 1526 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1527 * (uid 0 has no root power over NFS if not mapped explicitly.) 1528 */ 1529 if (seteuid((uid_t)pw->pw_uid) < 0) { 1530 reply(550, "Can't set uid."); 1531 goto bad; 1532 } 1533 if (chdir(homedir) < 0) { 1534 if (guest || dochroot) { 1535 reply(550, "Can't change to base directory."); 1536 goto bad; 1537 } else { 1538 if (chdir("/") < 0) { 1539 reply(550, "Root is inaccessible."); 1540 goto bad; 1541 } 1542 lreply(230, "No directory! Logging in with home=/"); 1543 } 1544 } 1545 1546 /* 1547 * Display a login message, if it exists. 1548 * N.B. reply(230,) must follow the message. 1549 */ 1550 #ifdef VIRTUAL_HOSTING 1551 fd = fopen(thishost->loginmsg, "r"); 1552 #else 1553 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1554 #endif 1555 if (fd != NULL) { 1556 char *cp, line[LINE_MAX]; 1557 1558 while (fgets(line, sizeof(line), fd) != NULL) { 1559 if ((cp = strchr(line, '\n')) != NULL) 1560 *cp = '\0'; 1561 lreply(230, "%s", line); 1562 } 1563 (void) fflush(stdout); 1564 (void) fclose(fd); 1565 } 1566 if (guest) { 1567 if (ident != NULL) 1568 free(ident); 1569 ident = strdup(passwd); 1570 if (ident == NULL) 1571 fatalerror("Ran out of memory."); 1572 1573 reply(230, "Guest login ok, access restrictions apply."); 1574 #ifdef SETPROCTITLE 1575 #ifdef VIRTUAL_HOSTING 1576 if (thishost != firsthost) 1577 snprintf(proctitle, sizeof(proctitle), 1578 "%s: anonymous(%s)/%s", remotehost, hostname, 1579 passwd); 1580 else 1581 #endif 1582 snprintf(proctitle, sizeof(proctitle), 1583 "%s: anonymous/%s", remotehost, passwd); 1584 setproctitle("%s", proctitle); 1585 #endif /* SETPROCTITLE */ 1586 if (logging) 1587 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1588 remotehost, passwd); 1589 } else { 1590 if (dochroot) 1591 reply(230, "User %s logged in, " 1592 "access restrictions apply.", pw->pw_name); 1593 else 1594 reply(230, "User %s logged in.", pw->pw_name); 1595 1596 #ifdef SETPROCTITLE 1597 snprintf(proctitle, sizeof(proctitle), 1598 "%s: user/%s", remotehost, pw->pw_name); 1599 setproctitle("%s", proctitle); 1600 #endif /* SETPROCTITLE */ 1601 if (logging) 1602 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1603 remotehost, pw->pw_name); 1604 } 1605 #ifdef LOGIN_CAP 1606 login_close(lc); 1607 #endif 1608 if (chrootdir) 1609 free(chrootdir); 1610 if (residue) 1611 free(residue); 1612 return; 1613 bad: 1614 /* Forget all about it... */ 1615 #ifdef LOGIN_CAP 1616 login_close(lc); 1617 #endif 1618 if (chrootdir) 1619 free(chrootdir); 1620 if (residue) 1621 free(residue); 1622 end_login(); 1623 } 1624 1625 void 1626 retrieve(char *cmd, char *name) 1627 { 1628 FILE *fin, *dout; 1629 struct stat st; 1630 int (*closefunc)(FILE *); 1631 time_t start; 1632 1633 if (cmd == 0) { 1634 fin = fopen(name, "r"), closefunc = fclose; 1635 st.st_size = 0; 1636 } else { 1637 char line[BUFSIZ]; 1638 1639 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1640 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1641 st.st_size = -1; 1642 st.st_blksize = BUFSIZ; 1643 } 1644 if (fin == NULL) { 1645 if (errno != 0) { 1646 perror_reply(550, name); 1647 if (cmd == 0) { 1648 LOGCMD("get", name); 1649 } 1650 } 1651 return; 1652 } 1653 byte_count = -1; 1654 if (cmd == 0) { 1655 if (fstat(fileno(fin), &st) < 0) { 1656 perror_reply(550, name); 1657 goto done; 1658 } 1659 if (!S_ISREG(st.st_mode)) { 1660 /* 1661 * Never sending a raw directory is a workaround 1662 * for buggy clients that will attempt to RETR 1663 * a directory before listing it, e.g., Mozilla. 1664 * Preventing a guest from getting irregular files 1665 * is a simple security measure. 1666 */ 1667 if (S_ISDIR(st.st_mode) || guest) { 1668 reply(550, "%s: not a plain file.", name); 1669 goto done; 1670 } 1671 st.st_size = -1; 1672 /* st.st_blksize is set for all descriptor types */ 1673 } 1674 } 1675 if (restart_point) { 1676 if (type == TYPE_A) { 1677 off_t i, n; 1678 int c; 1679 1680 n = restart_point; 1681 i = 0; 1682 while (i++ < n) { 1683 if ((c=getc(fin)) == EOF) { 1684 perror_reply(550, name); 1685 goto done; 1686 } 1687 if (c == '\n') 1688 i++; 1689 } 1690 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1691 perror_reply(550, name); 1692 goto done; 1693 } 1694 } 1695 dout = dataconn(name, st.st_size, "w"); 1696 if (dout == NULL) 1697 goto done; 1698 time(&start); 1699 send_data(fin, dout, st.st_blksize, st.st_size, 1700 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1701 if (cmd == 0 && guest && stats) 1702 logxfer(name, st.st_size, start); 1703 (void) fclose(dout); 1704 data = -1; 1705 pdata = -1; 1706 done: 1707 if (cmd == 0) 1708 LOGBYTES("get", name, byte_count); 1709 (*closefunc)(fin); 1710 } 1711 1712 void 1713 store(char *name, char *mode, int unique) 1714 { 1715 int fd; 1716 FILE *fout, *din; 1717 int (*closefunc)(FILE *); 1718 1719 if (*mode == 'a') { /* APPE */ 1720 if (unique) { 1721 /* Programming error */ 1722 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1723 unique = 0; 1724 } 1725 if (guest && noguestmod) { 1726 reply(550, "Appending to existing file denied"); 1727 goto err; 1728 } 1729 restart_point = 0; /* not affected by preceding REST */ 1730 } 1731 if (unique) /* STOU overrides REST */ 1732 restart_point = 0; 1733 if (guest && noguestmod) { 1734 if (restart_point) { /* guest STOR w/REST */ 1735 reply(550, "Modifying existing file denied"); 1736 goto err; 1737 } else /* treat guest STOR as STOU */ 1738 unique = 1; 1739 } 1740 1741 if (restart_point) 1742 mode = "r+"; /* so ASCII manual seek can work */ 1743 if (unique) { 1744 if ((fd = guniquefd(name, &name)) < 0) 1745 goto err; 1746 fout = fdopen(fd, mode); 1747 } else 1748 fout = fopen(name, mode); 1749 closefunc = fclose; 1750 if (fout == NULL) { 1751 perror_reply(553, name); 1752 goto err; 1753 } 1754 byte_count = -1; 1755 if (restart_point) { 1756 if (type == TYPE_A) { 1757 off_t i, n; 1758 int c; 1759 1760 n = restart_point; 1761 i = 0; 1762 while (i++ < n) { 1763 if ((c=getc(fout)) == EOF) { 1764 perror_reply(550, name); 1765 goto done; 1766 } 1767 if (c == '\n') 1768 i++; 1769 } 1770 /* 1771 * We must do this seek to "current" position 1772 * because we are changing from reading to 1773 * writing. 1774 */ 1775 if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) { 1776 perror_reply(550, name); 1777 goto done; 1778 } 1779 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1780 perror_reply(550, name); 1781 goto done; 1782 } 1783 } 1784 din = dataconn(name, (off_t)-1, "r"); 1785 if (din == NULL) 1786 goto done; 1787 if (receive_data(din, fout) == 0) { 1788 if (unique) 1789 reply(226, "Transfer complete (unique file name:%s).", 1790 name); 1791 else 1792 reply(226, "Transfer complete."); 1793 } 1794 (void) fclose(din); 1795 data = -1; 1796 pdata = -1; 1797 done: 1798 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1799 (*closefunc)(fout); 1800 return; 1801 err: 1802 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1803 return; 1804 } 1805 1806 static FILE * 1807 getdatasock(char *mode) 1808 { 1809 int on = 1, s, t, tries; 1810 1811 if (data >= 0) 1812 return (fdopen(data, mode)); 1813 (void) seteuid((uid_t)0); 1814 1815 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1816 if (s < 0) 1817 goto bad; 1818 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1819 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1820 /* anchor socket to avoid multi-homing problems */ 1821 data_source = ctrl_addr; 1822 data_source.su_port = htons(dataport); 1823 for (tries = 1; ; tries++) { 1824 if (bind(s, (struct sockaddr *)&data_source, 1825 data_source.su_len) >= 0) 1826 break; 1827 if (errno != EADDRINUSE || tries > 10) 1828 goto bad; 1829 sleep(tries); 1830 } 1831 (void) seteuid((uid_t)pw->pw_uid); 1832 #ifdef IP_TOS 1833 if (data_source.su_family == AF_INET) 1834 { 1835 on = IPTOS_THROUGHPUT; 1836 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1837 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1838 } 1839 #endif 1840 #ifdef TCP_NOPUSH 1841 /* 1842 * Turn off push flag to keep sender TCP from sending short packets 1843 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1844 * to set the send buffer size as well, but that may not be desirable 1845 * in heavy-load situations. 1846 */ 1847 on = 1; 1848 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1849 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1850 #endif 1851 #ifdef SO_SNDBUF 1852 on = 65536; 1853 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1854 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1855 #endif 1856 1857 return (fdopen(s, mode)); 1858 bad: 1859 /* Return the real value of errno (close may change it) */ 1860 t = errno; 1861 (void) seteuid((uid_t)pw->pw_uid); 1862 (void) close(s); 1863 errno = t; 1864 return (NULL); 1865 } 1866 1867 static FILE * 1868 dataconn(char *name, off_t size, char *mode) 1869 { 1870 char sizebuf[32]; 1871 FILE *file; 1872 int retry = 0, tos, conerrno; 1873 1874 file_size = size; 1875 byte_count = 0; 1876 if (size != (off_t) -1) 1877 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size); 1878 else 1879 *sizebuf = '\0'; 1880 if (pdata >= 0) { 1881 union sockunion from; 1882 int flags; 1883 int s, fromlen = ctrl_addr.su_len; 1884 struct timeval timeout; 1885 fd_set set; 1886 1887 FD_ZERO(&set); 1888 FD_SET(pdata, &set); 1889 1890 timeout.tv_usec = 0; 1891 timeout.tv_sec = 120; 1892 1893 /* 1894 * Granted a socket is in the blocking I/O mode, 1895 * accept() will block after a successful select() 1896 * if the selected connection dies in between. 1897 * Therefore set the non-blocking I/O flag here. 1898 */ 1899 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1900 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1901 goto pdata_err; 1902 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) <= 0 || 1903 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1904 goto pdata_err; 1905 (void) close(pdata); 1906 pdata = s; 1907 /* 1908 * Unset the inherited non-blocking I/O flag 1909 * on the child socket so stdio can work on it. 1910 */ 1911 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1912 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1913 goto pdata_err; 1914 #ifdef IP_TOS 1915 if (from.su_family == AF_INET) 1916 { 1917 tos = IPTOS_THROUGHPUT; 1918 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1919 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1920 } 1921 #endif 1922 reply(150, "Opening %s mode data connection for '%s'%s.", 1923 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1924 return (fdopen(pdata, mode)); 1925 pdata_err: 1926 reply(425, "Can't open data connection."); 1927 (void) close(pdata); 1928 pdata = -1; 1929 return (NULL); 1930 } 1931 if (data >= 0) { 1932 reply(125, "Using existing data connection for '%s'%s.", 1933 name, sizebuf); 1934 usedefault = 1; 1935 return (fdopen(data, mode)); 1936 } 1937 if (usedefault) 1938 data_dest = his_addr; 1939 usedefault = 1; 1940 do { 1941 file = getdatasock(mode); 1942 if (file == NULL) { 1943 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1944 getnameinfo((struct sockaddr *)&data_source, 1945 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1946 portbuf, sizeof(portbuf), 1947 NI_NUMERICHOST|NI_NUMERICSERV); 1948 reply(425, "Can't create data socket (%s,%s): %s.", 1949 hostbuf, portbuf, strerror(errno)); 1950 return (NULL); 1951 } 1952 data = fileno(file); 1953 conerrno = 0; 1954 if (connect(data, (struct sockaddr *)&data_dest, 1955 data_dest.su_len) == 0) 1956 break; 1957 conerrno = errno; 1958 (void) fclose(file); 1959 data = -1; 1960 if (conerrno == EADDRINUSE) { 1961 sleep((unsigned) swaitint); 1962 retry += swaitint; 1963 } else { 1964 break; 1965 } 1966 } while (retry <= swaitmax); 1967 if (conerrno != 0) { 1968 perror_reply(425, "Can't build data connection"); 1969 return (NULL); 1970 } 1971 reply(150, "Opening %s mode data connection for '%s'%s.", 1972 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1973 return (file); 1974 } 1975 1976 /* 1977 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1978 * encapsulation of the data subject to Mode, Structure, and Type. 1979 * 1980 * NB: Form isn't handled. 1981 */ 1982 static int 1983 send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1984 { 1985 int c, cp, filefd, netfd; 1986 char *buf; 1987 off_t cnt; 1988 1989 transflag++; 1990 switch (type) { 1991 1992 case TYPE_A: 1993 cp = '\0'; 1994 while ((c = getc(instr)) != EOF) { 1995 if (recvurg) 1996 goto got_oob; 1997 byte_count++; 1998 if (c == '\n' && cp != '\r') { 1999 if (ferror(outstr)) 2000 goto data_err; 2001 (void) putc('\r', outstr); 2002 } 2003 (void) putc(c, outstr); 2004 cp = c; 2005 } 2006 if (recvurg) 2007 goto got_oob; 2008 fflush(outstr); 2009 transflag = 0; 2010 if (ferror(instr)) 2011 goto file_err; 2012 if (ferror(outstr)) 2013 goto data_err; 2014 reply(226, "Transfer complete."); 2015 return (0); 2016 2017 case TYPE_I: 2018 case TYPE_L: 2019 /* 2020 * isreg is only set if we are not doing restart and we 2021 * are sending a regular file 2022 */ 2023 netfd = fileno(outstr); 2024 filefd = fileno(instr); 2025 2026 if (isreg) { 2027 2028 off_t offset; 2029 int err; 2030 2031 err = cnt = offset = 0; 2032 2033 while (err != -1 && filesize > 0) { 2034 err = sendfile(filefd, netfd, offset, 0, 2035 (struct sf_hdtr *) NULL, &cnt, 0); 2036 /* 2037 * Calculate byte_count before OOB processing. 2038 * It can be used in myoob() later. 2039 */ 2040 byte_count += cnt; 2041 if (recvurg) 2042 goto got_oob; 2043 offset += cnt; 2044 filesize -= cnt; 2045 2046 if (err == -1) { 2047 if (!cnt) 2048 goto oldway; 2049 2050 goto data_err; 2051 } 2052 } 2053 2054 transflag = 0; 2055 reply(226, "Transfer complete."); 2056 return (0); 2057 } 2058 2059 oldway: 2060 if ((buf = malloc((u_int)blksize)) == NULL) { 2061 transflag = 0; 2062 perror_reply(451, "Local resource failure: malloc"); 2063 return (-1); 2064 } 2065 2066 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 2067 write(netfd, buf, cnt) == cnt) 2068 byte_count += cnt; 2069 transflag = 0; 2070 (void)free(buf); 2071 if (cnt != 0) { 2072 if (cnt < 0) 2073 goto file_err; 2074 goto data_err; 2075 } 2076 reply(226, "Transfer complete."); 2077 return (0); 2078 default: 2079 transflag = 0; 2080 reply(550, "Unimplemented TYPE %d in send_data", type); 2081 return (-1); 2082 } 2083 2084 data_err: 2085 transflag = 0; 2086 perror_reply(426, "Data connection"); 2087 return (-1); 2088 2089 file_err: 2090 transflag = 0; 2091 perror_reply(551, "Error on input file"); 2092 return (-1); 2093 2094 got_oob: 2095 myoob(); 2096 recvurg = 0; 2097 transflag = 0; 2098 return (-1); 2099 } 2100 2101 /* 2102 * Transfer data from peer to "outstr" using the appropriate encapulation of 2103 * the data subject to Mode, Structure, and Type. 2104 * 2105 * N.B.: Form isn't handled. 2106 */ 2107 static int 2108 receive_data(FILE *instr, FILE *outstr) 2109 { 2110 int c; 2111 int cnt, bare_lfs; 2112 char buf[BUFSIZ]; 2113 2114 transflag++; 2115 bare_lfs = 0; 2116 2117 switch (type) { 2118 2119 case TYPE_I: 2120 case TYPE_L: 2121 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 2122 if (recvurg) 2123 goto got_oob; 2124 if (write(fileno(outstr), buf, cnt) != cnt) 2125 goto file_err; 2126 byte_count += cnt; 2127 } 2128 if (recvurg) 2129 goto got_oob; 2130 if (cnt < 0) 2131 goto data_err; 2132 transflag = 0; 2133 return (0); 2134 2135 case TYPE_E: 2136 reply(553, "TYPE E not implemented."); 2137 transflag = 0; 2138 return (-1); 2139 2140 case TYPE_A: 2141 while ((c = getc(instr)) != EOF) { 2142 if (recvurg) 2143 goto got_oob; 2144 byte_count++; 2145 if (c == '\n') 2146 bare_lfs++; 2147 while (c == '\r') { 2148 if (ferror(outstr)) 2149 goto data_err; 2150 if ((c = getc(instr)) != '\n') { 2151 (void) putc ('\r', outstr); 2152 if (c == '\0' || c == EOF) 2153 goto contin2; 2154 } 2155 } 2156 (void) putc(c, outstr); 2157 contin2: ; 2158 } 2159 if (recvurg) 2160 goto got_oob; 2161 fflush(outstr); 2162 if (ferror(instr)) 2163 goto data_err; 2164 if (ferror(outstr)) 2165 goto file_err; 2166 transflag = 0; 2167 if (bare_lfs) { 2168 lreply(226, 2169 "WARNING! %d bare linefeeds received in ASCII mode", 2170 bare_lfs); 2171 (void)printf(" File may not have transferred correctly.\r\n"); 2172 } 2173 return (0); 2174 default: 2175 reply(550, "Unimplemented TYPE %d in receive_data", type); 2176 transflag = 0; 2177 return (-1); 2178 } 2179 2180 data_err: 2181 transflag = 0; 2182 perror_reply(426, "Data Connection"); 2183 return (-1); 2184 2185 file_err: 2186 transflag = 0; 2187 perror_reply(452, "Error writing file"); 2188 return (-1); 2189 2190 got_oob: 2191 myoob(); 2192 recvurg = 0; 2193 transflag = 0; 2194 return (-1); 2195 } 2196 2197 void 2198 statfilecmd(char *filename) 2199 { 2200 FILE *fin; 2201 int atstart; 2202 int c; 2203 char line[LINE_MAX]; 2204 2205 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2206 fin = ftpd_popen(line, "r"); 2207 lreply(211, "status of %s:", filename); 2208 atstart = 1; 2209 while ((c = getc(fin)) != EOF) { 2210 if (c == '\n') { 2211 if (ferror(stdout)){ 2212 perror_reply(421, "control connection"); 2213 (void) ftpd_pclose(fin); 2214 dologout(1); 2215 /* NOTREACHED */ 2216 } 2217 if (ferror(fin)) { 2218 perror_reply(551, filename); 2219 (void) ftpd_pclose(fin); 2220 return; 2221 } 2222 (void) putc('\r', stdout); 2223 } 2224 /* 2225 * RFC 959 says neutral text should be prepended before 2226 * a leading 3-digit number followed by whitespace, but 2227 * many ftp clients can be confused by any leading digits, 2228 * as a matter of fact. 2229 */ 2230 if (atstart && isdigit(c)) 2231 (void) putc(' ', stdout); 2232 (void) putc(c, stdout); 2233 atstart = (c == '\n'); 2234 } 2235 (void) ftpd_pclose(fin); 2236 reply(211, "End of Status"); 2237 } 2238 2239 void 2240 statcmd(void) 2241 { 2242 union sockunion *su; 2243 u_char *a, *p; 2244 char hname[NI_MAXHOST]; 2245 int ispassive; 2246 2247 if (hostinfo) { 2248 lreply(211, "%s FTP server status:", hostname); 2249 printf(" %s\r\n", version); 2250 } else 2251 lreply(211, "FTP server status:"); 2252 printf(" Connected to %s", remotehost); 2253 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2254 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2255 if (strcmp(hname, remotehost) != 0) 2256 printf(" (%s)", hname); 2257 } 2258 printf("\r\n"); 2259 if (logged_in) { 2260 if (guest) 2261 printf(" Logged in anonymously\r\n"); 2262 else 2263 printf(" Logged in as %s\r\n", pw->pw_name); 2264 } else if (askpasswd) 2265 printf(" Waiting for password\r\n"); 2266 else 2267 printf(" Waiting for user name\r\n"); 2268 printf(" TYPE: %s", typenames[type]); 2269 if (type == TYPE_A || type == TYPE_E) 2270 printf(", FORM: %s", formnames[form]); 2271 if (type == TYPE_L) 2272 #if CHAR_BIT == 8 2273 printf(" %d", CHAR_BIT); 2274 #else 2275 printf(" %d", bytesize); /* need definition! */ 2276 #endif 2277 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2278 strunames[stru], modenames[mode]); 2279 if (data != -1) 2280 printf(" Data connection open\r\n"); 2281 else if (pdata != -1) { 2282 ispassive = 1; 2283 su = &pasv_addr; 2284 goto printaddr; 2285 } else if (usedefault == 0) { 2286 ispassive = 0; 2287 su = &data_dest; 2288 printaddr: 2289 #define UC(b) (((int) b) & 0xff) 2290 if (epsvall) { 2291 printf(" EPSV only mode (EPSV ALL)\r\n"); 2292 goto epsvonly; 2293 } 2294 2295 /* PORT/PASV */ 2296 if (su->su_family == AF_INET) { 2297 a = (u_char *) &su->su_sin.sin_addr; 2298 p = (u_char *) &su->su_sin.sin_port; 2299 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2300 ispassive ? "PASV" : "PORT", 2301 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2302 UC(p[0]), UC(p[1])); 2303 } 2304 2305 /* LPRT/LPSV */ 2306 { 2307 int alen, af, i; 2308 2309 switch (su->su_family) { 2310 case AF_INET: 2311 a = (u_char *) &su->su_sin.sin_addr; 2312 p = (u_char *) &su->su_sin.sin_port; 2313 alen = sizeof(su->su_sin.sin_addr); 2314 af = 4; 2315 break; 2316 case AF_INET6: 2317 a = (u_char *) &su->su_sin6.sin6_addr; 2318 p = (u_char *) &su->su_sin6.sin6_port; 2319 alen = sizeof(su->su_sin6.sin6_addr); 2320 af = 6; 2321 break; 2322 default: 2323 af = 0; 2324 break; 2325 } 2326 if (af) { 2327 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2328 af, alen); 2329 for (i = 0; i < alen; i++) 2330 printf("%d,", UC(a[i])); 2331 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2332 } 2333 } 2334 2335 epsvonly:; 2336 /* EPRT/EPSV */ 2337 { 2338 int af; 2339 2340 switch (su->su_family) { 2341 case AF_INET: 2342 af = 1; 2343 break; 2344 case AF_INET6: 2345 af = 2; 2346 break; 2347 default: 2348 af = 0; 2349 break; 2350 } 2351 if (af) { 2352 union sockunion tmp; 2353 2354 tmp = *su; 2355 if (tmp.su_family == AF_INET6) 2356 tmp.su_sin6.sin6_scope_id = 0; 2357 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2358 hname, sizeof(hname) - 1, NULL, 0, 2359 NI_NUMERICHOST)) { 2360 printf(" %s |%d|%s|%d|\r\n", 2361 ispassive ? "EPSV" : "EPRT", 2362 af, hname, htons(tmp.su_port)); 2363 } 2364 } 2365 } 2366 #undef UC 2367 } else 2368 printf(" No data connection\r\n"); 2369 reply(211, "End of status"); 2370 } 2371 2372 void 2373 fatalerror(char *s) 2374 { 2375 2376 reply(451, "Error in server: %s\n", s); 2377 reply(221, "Closing connection due to server error."); 2378 dologout(0); 2379 /* NOTREACHED */ 2380 } 2381 2382 void 2383 reply(int n, const char *fmt, ...) 2384 { 2385 va_list ap; 2386 2387 (void)printf("%d ", n); 2388 va_start(ap, fmt); 2389 (void)vprintf(fmt, ap); 2390 va_end(ap); 2391 (void)printf("\r\n"); 2392 (void)fflush(stdout); 2393 if (ftpdebug) { 2394 syslog(LOG_DEBUG, "<--- %d ", n); 2395 va_start(ap, fmt); 2396 vsyslog(LOG_DEBUG, fmt, ap); 2397 va_end(ap); 2398 } 2399 } 2400 2401 void 2402 lreply(int n, const char *fmt, ...) 2403 { 2404 va_list ap; 2405 2406 (void)printf("%d- ", n); 2407 va_start(ap, fmt); 2408 (void)vprintf(fmt, ap); 2409 va_end(ap); 2410 (void)printf("\r\n"); 2411 (void)fflush(stdout); 2412 if (ftpdebug) { 2413 syslog(LOG_DEBUG, "<--- %d- ", n); 2414 va_start(ap, fmt); 2415 vsyslog(LOG_DEBUG, fmt, ap); 2416 va_end(ap); 2417 } 2418 } 2419 2420 static void 2421 ack(char *s) 2422 { 2423 2424 reply(250, "%s command successful.", s); 2425 } 2426 2427 void 2428 nack(char *s) 2429 { 2430 2431 reply(502, "%s command not implemented.", s); 2432 } 2433 2434 /* ARGSUSED */ 2435 void 2436 yyerror(char *s) 2437 { 2438 char *cp; 2439 2440 if ((cp = strchr(cbuf,'\n'))) 2441 *cp = '\0'; 2442 reply(500, "'%s': command not understood.", cbuf); 2443 } 2444 2445 void 2446 delete(char *name) 2447 { 2448 struct stat st; 2449 2450 LOGCMD("delete", name); 2451 if (lstat(name, &st) < 0) { 2452 perror_reply(550, name); 2453 return; 2454 } 2455 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2456 if (rmdir(name) < 0) { 2457 perror_reply(550, name); 2458 return; 2459 } 2460 goto done; 2461 } 2462 if (guest && noguestmod) { 2463 reply(550, "Operation not permitted"); 2464 return; 2465 } 2466 if (unlink(name) < 0) { 2467 perror_reply(550, name); 2468 return; 2469 } 2470 done: 2471 ack("DELE"); 2472 } 2473 2474 void 2475 cwd(char *path) 2476 { 2477 2478 if (chdir(path) < 0) 2479 perror_reply(550, path); 2480 else 2481 ack("CWD"); 2482 } 2483 2484 void 2485 makedir(char *name) 2486 { 2487 char *s; 2488 2489 LOGCMD("mkdir", name); 2490 if (guest && noguestmkd) 2491 reply(550, "%s: permission denied", name); 2492 else if (mkdir(name, 0777) < 0) 2493 perror_reply(550, name); 2494 else { 2495 if ((s = doublequote(name)) == NULL) 2496 fatalerror("Ran out of memory."); 2497 reply(257, "\"%s\" directory created.", s); 2498 free(s); 2499 } 2500 } 2501 2502 void 2503 removedir(char *name) 2504 { 2505 2506 LOGCMD("rmdir", name); 2507 if (rmdir(name) < 0) 2508 perror_reply(550, name); 2509 else 2510 ack("RMD"); 2511 } 2512 2513 void 2514 pwd(void) 2515 { 2516 char *s, path[MAXPATHLEN + 1]; 2517 2518 if (getwd(path) == (char *)NULL) 2519 reply(550, "%s.", path); 2520 else { 2521 if ((s = doublequote(path)) == NULL) 2522 fatalerror("Ran out of memory."); 2523 reply(257, "\"%s\" is current directory.", s); 2524 free(s); 2525 } 2526 } 2527 2528 char * 2529 renamefrom(char *name) 2530 { 2531 struct stat st; 2532 2533 if (guest && noguestmod) { 2534 reply(550, "Operation not permitted"); 2535 return (NULL); 2536 } 2537 if (lstat(name, &st) < 0) { 2538 perror_reply(550, name); 2539 return (NULL); 2540 } 2541 reply(350, "File exists, ready for destination name"); 2542 return (name); 2543 } 2544 2545 void 2546 renamecmd(char *from, char *to) 2547 { 2548 struct stat st; 2549 2550 LOGCMD2("rename", from, to); 2551 2552 if (guest && (stat(to, &st) == 0)) { 2553 reply(550, "%s: permission denied", to); 2554 return; 2555 } 2556 2557 if (rename(from, to) < 0) 2558 perror_reply(550, "rename"); 2559 else 2560 ack("RNTO"); 2561 } 2562 2563 static void 2564 dolog(struct sockaddr *who) 2565 { 2566 int error; 2567 2568 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2569 2570 #ifdef SETPROCTITLE 2571 #ifdef VIRTUAL_HOSTING 2572 if (thishost != firsthost) 2573 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2574 remotehost, hostname); 2575 else 2576 #endif 2577 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2578 remotehost); 2579 setproctitle("%s", proctitle); 2580 #endif /* SETPROCTITLE */ 2581 2582 if (logging) { 2583 #ifdef VIRTUAL_HOSTING 2584 if (thishost != firsthost) 2585 syslog(LOG_INFO, "connection from %s (to %s)", 2586 remotehost, hostname); 2587 else 2588 #endif 2589 { 2590 char who_name[MAXHOSTNAMELEN]; 2591 2592 error = getnameinfo(who, who->sa_len, 2593 who_name, sizeof(who_name) - 1, 2594 NULL, 0, NI_NUMERICHOST); 2595 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2596 error == 0 ? who_name : ""); 2597 } 2598 } 2599 } 2600 2601 /* 2602 * Record logout in wtmp file 2603 * and exit with supplied status. 2604 */ 2605 void 2606 dologout(int status) 2607 { 2608 /* 2609 * Prevent reception of SIGURG from resulting in a resumption 2610 * back to the main program loop. 2611 */ 2612 transflag = 0; 2613 2614 if (logged_in && dowtmp) { 2615 (void) seteuid((uid_t)0); 2616 ftpd_logwtmp(ttyline, "", NULL); 2617 } 2618 /* beware of flushing buffers after a SIGPIPE */ 2619 _exit(status); 2620 } 2621 2622 static void 2623 sigurg(int signo) 2624 { 2625 2626 recvurg = 1; 2627 } 2628 2629 static void 2630 myoob(void) 2631 { 2632 char *cp; 2633 2634 /* only process if transfer occurring */ 2635 if (!transflag) 2636 return; 2637 cp = tmpline; 2638 if (getline(cp, 7, stdin) == NULL) { 2639 reply(221, "You could at least say goodbye."); 2640 dologout(0); 2641 } 2642 upper(cp); 2643 if (strcmp(cp, "ABOR\r\n") == 0) { 2644 tmpline[0] = '\0'; 2645 reply(426, "Transfer aborted. Data connection closed."); 2646 reply(226, "Abort successful"); 2647 } 2648 if (strcmp(cp, "STAT\r\n") == 0) { 2649 tmpline[0] = '\0'; 2650 if (file_size != (off_t) -1) 2651 reply(213, "Status: %qd of %qd bytes transferred", 2652 byte_count, file_size); 2653 else 2654 reply(213, "Status: %qd bytes transferred", byte_count); 2655 } 2656 } 2657 2658 /* 2659 * Note: a response of 425 is not mentioned as a possible response to 2660 * the PASV command in RFC959. However, it has been blessed as 2661 * a legitimate response by Jon Postel in a telephone conversation 2662 * with Rick Adams on 25 Jan 89. 2663 */ 2664 void 2665 passive(void) 2666 { 2667 int len, on; 2668 char *p, *a; 2669 2670 if (pdata >= 0) /* close old port if one set */ 2671 close(pdata); 2672 2673 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2674 if (pdata < 0) { 2675 perror_reply(425, "Can't open passive connection"); 2676 return; 2677 } 2678 on = 1; 2679 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2680 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2681 2682 (void) seteuid((uid_t)0); 2683 2684 #ifdef IP_PORTRANGE 2685 if (ctrl_addr.su_family == AF_INET) { 2686 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2687 : IP_PORTRANGE_DEFAULT; 2688 2689 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2690 &on, sizeof(on)) < 0) 2691 goto pasv_error; 2692 } 2693 #endif 2694 #ifdef IPV6_PORTRANGE 2695 if (ctrl_addr.su_family == AF_INET6) { 2696 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2697 : IPV6_PORTRANGE_DEFAULT; 2698 2699 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2700 &on, sizeof(on)) < 0) 2701 goto pasv_error; 2702 } 2703 #endif 2704 2705 pasv_addr = ctrl_addr; 2706 pasv_addr.su_port = 0; 2707 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2708 goto pasv_error; 2709 2710 (void) seteuid((uid_t)pw->pw_uid); 2711 2712 len = sizeof(pasv_addr); 2713 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2714 goto pasv_error; 2715 if (listen(pdata, 1) < 0) 2716 goto pasv_error; 2717 if (pasv_addr.su_family == AF_INET) 2718 a = (char *) &pasv_addr.su_sin.sin_addr; 2719 else if (pasv_addr.su_family == AF_INET6 && 2720 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2721 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2722 else 2723 goto pasv_error; 2724 2725 p = (char *) &pasv_addr.su_port; 2726 2727 #define UC(b) (((int) b) & 0xff) 2728 2729 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2730 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2731 return; 2732 2733 pasv_error: 2734 (void) seteuid((uid_t)pw->pw_uid); 2735 (void) close(pdata); 2736 pdata = -1; 2737 perror_reply(425, "Can't open passive connection"); 2738 return; 2739 } 2740 2741 /* 2742 * Long Passive defined in RFC 1639. 2743 * 228 Entering Long Passive Mode 2744 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2745 */ 2746 2747 void 2748 long_passive(char *cmd, int pf) 2749 { 2750 int len, on; 2751 char *p, *a; 2752 2753 if (pdata >= 0) /* close old port if one set */ 2754 close(pdata); 2755 2756 if (pf != PF_UNSPEC) { 2757 if (ctrl_addr.su_family != pf) { 2758 switch (ctrl_addr.su_family) { 2759 case AF_INET: 2760 pf = 1; 2761 break; 2762 case AF_INET6: 2763 pf = 2; 2764 break; 2765 default: 2766 pf = 0; 2767 break; 2768 } 2769 /* 2770 * XXX 2771 * only EPRT/EPSV ready clients will understand this 2772 */ 2773 if (strcmp(cmd, "EPSV") == 0 && pf) { 2774 reply(522, "Network protocol mismatch, " 2775 "use (%d)", pf); 2776 } else 2777 reply(501, "Network protocol mismatch"); /*XXX*/ 2778 2779 return; 2780 } 2781 } 2782 2783 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2784 if (pdata < 0) { 2785 perror_reply(425, "Can't open passive connection"); 2786 return; 2787 } 2788 on = 1; 2789 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2790 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2791 2792 (void) seteuid((uid_t)0); 2793 2794 pasv_addr = ctrl_addr; 2795 pasv_addr.su_port = 0; 2796 len = pasv_addr.su_len; 2797 2798 #ifdef IP_PORTRANGE 2799 if (ctrl_addr.su_family == AF_INET) { 2800 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2801 : IP_PORTRANGE_DEFAULT; 2802 2803 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2804 &on, sizeof(on)) < 0) 2805 goto pasv_error; 2806 } 2807 #endif 2808 #ifdef IPV6_PORTRANGE 2809 if (ctrl_addr.su_family == AF_INET6) { 2810 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2811 : IPV6_PORTRANGE_DEFAULT; 2812 2813 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2814 &on, sizeof(on)) < 0) 2815 goto pasv_error; 2816 } 2817 #endif 2818 2819 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2820 goto pasv_error; 2821 2822 (void) seteuid((uid_t)pw->pw_uid); 2823 2824 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2825 goto pasv_error; 2826 if (listen(pdata, 1) < 0) 2827 goto pasv_error; 2828 2829 #define UC(b) (((int) b) & 0xff) 2830 2831 if (strcmp(cmd, "LPSV") == 0) { 2832 p = (char *)&pasv_addr.su_port; 2833 switch (pasv_addr.su_family) { 2834 case AF_INET: 2835 a = (char *) &pasv_addr.su_sin.sin_addr; 2836 v4_reply: 2837 reply(228, 2838 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2839 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2840 2, UC(p[0]), UC(p[1])); 2841 return; 2842 case AF_INET6: 2843 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2844 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2845 goto v4_reply; 2846 } 2847 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2848 reply(228, 2849 "Entering Long Passive Mode " 2850 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2851 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2852 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2853 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2854 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2855 2, UC(p[0]), UC(p[1])); 2856 return; 2857 } 2858 } else if (strcmp(cmd, "EPSV") == 0) { 2859 switch (pasv_addr.su_family) { 2860 case AF_INET: 2861 case AF_INET6: 2862 reply(229, "Entering Extended Passive Mode (|||%d|)", 2863 ntohs(pasv_addr.su_port)); 2864 return; 2865 } 2866 } else { 2867 /* more proper error code? */ 2868 } 2869 2870 pasv_error: 2871 (void) seteuid((uid_t)pw->pw_uid); 2872 (void) close(pdata); 2873 pdata = -1; 2874 perror_reply(425, "Can't open passive connection"); 2875 return; 2876 } 2877 2878 /* 2879 * Generate unique name for file with basename "local" 2880 * and open the file in order to avoid possible races. 2881 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2882 * Return descriptor to the file, set "name" to its name. 2883 * 2884 * Generates failure reply on error. 2885 */ 2886 static int 2887 guniquefd(char *local, char **name) 2888 { 2889 static char new[MAXPATHLEN]; 2890 struct stat st; 2891 char *cp; 2892 int count; 2893 int fd; 2894 2895 cp = strrchr(local, '/'); 2896 if (cp) 2897 *cp = '\0'; 2898 if (stat(cp ? local : ".", &st) < 0) { 2899 perror_reply(553, cp ? local : "."); 2900 return (-1); 2901 } 2902 if (cp) { 2903 /* 2904 * Let not overwrite dirname with counter suffix. 2905 * -4 is for /nn\0 2906 * In this extreme case dot won't be put in front of suffix. 2907 */ 2908 if (strlen(local) > sizeof(new) - 4) { 2909 reply(553, "Pathname too long"); 2910 return (-1); 2911 } 2912 *cp = '/'; 2913 } 2914 /* -4 is for the .nn<null> we put on the end below */ 2915 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2916 cp = new + strlen(new); 2917 /* 2918 * Don't generate dotfile unless requested explicitly. 2919 * This covers the case when basename gets truncated off 2920 * by buffer size. 2921 */ 2922 if (cp > new && cp[-1] != '/') 2923 *cp++ = '.'; 2924 for (count = 0; count < 100; count++) { 2925 /* At count 0 try unmodified name */ 2926 if (count) 2927 (void)sprintf(cp, "%d", count); 2928 if ((fd = open(count ? new : local, 2929 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2930 *name = count ? new : local; 2931 return (fd); 2932 } 2933 if (errno != EEXIST) { 2934 perror_reply(553, count ? new : local); 2935 return (-1); 2936 } 2937 } 2938 reply(452, "Unique file name cannot be created."); 2939 return (-1); 2940 } 2941 2942 /* 2943 * Format and send reply containing system error number. 2944 */ 2945 void 2946 perror_reply(int code, char *string) 2947 { 2948 2949 reply(code, "%s: %s.", string, strerror(errno)); 2950 } 2951 2952 static char *onefile[] = { 2953 "", 2954 0 2955 }; 2956 2957 void 2958 send_file_list(char *whichf) 2959 { 2960 struct stat st; 2961 DIR *dirp = NULL; 2962 struct dirent *dir; 2963 FILE *dout = NULL; 2964 char **dirlist, *dirname; 2965 int simple = 0; 2966 int freeglob = 0; 2967 glob_t gl; 2968 2969 if (strpbrk(whichf, "~{[*?") != NULL) { 2970 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2971 2972 memset(&gl, 0, sizeof(gl)); 2973 gl.gl_matchc = MAXGLOBARGS; 2974 flags |= GLOB_LIMIT; 2975 freeglob = 1; 2976 if (glob(whichf, flags, 0, &gl)) { 2977 reply(550, "not found"); 2978 goto out; 2979 } else if (gl.gl_pathc == 0) { 2980 errno = ENOENT; 2981 perror_reply(550, whichf); 2982 goto out; 2983 } 2984 dirlist = gl.gl_pathv; 2985 } else { 2986 onefile[0] = whichf; 2987 dirlist = onefile; 2988 simple = 1; 2989 } 2990 2991 while ((dirname = *dirlist++)) { 2992 if (stat(dirname, &st) < 0) { 2993 /* 2994 * If user typed "ls -l", etc, and the client 2995 * used NLST, do what the user meant. 2996 */ 2997 if (dirname[0] == '-' && *dirlist == NULL && 2998 transflag == 0) { 2999 retrieve(_PATH_LS " %s", dirname); 3000 goto out; 3001 } 3002 perror_reply(550, whichf); 3003 if (dout != NULL) { 3004 (void) fclose(dout); 3005 transflag = 0; 3006 data = -1; 3007 pdata = -1; 3008 } 3009 goto out; 3010 } 3011 3012 if (S_ISREG(st.st_mode)) { 3013 if (dout == NULL) { 3014 dout = dataconn("file list", (off_t)-1, "w"); 3015 if (dout == NULL) 3016 goto out; 3017 transflag++; 3018 } 3019 fprintf(dout, "%s%s\n", dirname, 3020 type == TYPE_A ? "\r" : ""); 3021 byte_count += strlen(dirname) + 1; 3022 continue; 3023 } else if (!S_ISDIR(st.st_mode)) 3024 continue; 3025 3026 if ((dirp = opendir(dirname)) == NULL) 3027 continue; 3028 3029 while ((dir = readdir(dirp)) != NULL) { 3030 char nbuf[MAXPATHLEN]; 3031 3032 if (recvurg) { 3033 myoob(); 3034 recvurg = 0; 3035 transflag = 0; 3036 goto out; 3037 } 3038 3039 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3040 continue; 3041 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3042 dir->d_namlen == 2) 3043 continue; 3044 3045 snprintf(nbuf, sizeof(nbuf), 3046 "%s/%s", dirname, dir->d_name); 3047 3048 /* 3049 * We have to do a stat to insure it's 3050 * not a directory or special file. 3051 */ 3052 if (simple || (stat(nbuf, &st) == 0 && 3053 S_ISREG(st.st_mode))) { 3054 if (dout == NULL) { 3055 dout = dataconn("file list", (off_t)-1, 3056 "w"); 3057 if (dout == NULL) 3058 goto out; 3059 transflag++; 3060 } 3061 if (nbuf[0] == '.' && nbuf[1] == '/') 3062 fprintf(dout, "%s%s\n", &nbuf[2], 3063 type == TYPE_A ? "\r" : ""); 3064 else 3065 fprintf(dout, "%s%s\n", nbuf, 3066 type == TYPE_A ? "\r" : ""); 3067 byte_count += strlen(nbuf) + 1; 3068 } 3069 } 3070 (void) closedir(dirp); 3071 } 3072 3073 if (dout == NULL) 3074 reply(550, "No files found."); 3075 else if (ferror(dout) != 0) 3076 perror_reply(550, "Data connection"); 3077 else 3078 reply(226, "Transfer complete."); 3079 3080 transflag = 0; 3081 if (dout != NULL) 3082 (void) fclose(dout); 3083 data = -1; 3084 pdata = -1; 3085 out: 3086 if (freeglob) { 3087 freeglob = 0; 3088 globfree(&gl); 3089 } 3090 } 3091 3092 void 3093 reapchild(int signo) 3094 { 3095 while (wait3(NULL, WNOHANG, NULL) > 0); 3096 } 3097 3098 #ifdef OLD_SETPROCTITLE 3099 /* 3100 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3101 * Warning, since this is usually started from inetd.conf, it often doesn't 3102 * have much of an environment or arglist to overwrite. 3103 */ 3104 void 3105 setproctitle(const char *fmt, ...) 3106 { 3107 int i; 3108 va_list ap; 3109 char *p, *bp, ch; 3110 char buf[LINE_MAX]; 3111 3112 va_start(ap, fmt); 3113 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3114 3115 /* make ps print our process name */ 3116 p = Argv[0]; 3117 *p++ = '-'; 3118 3119 i = strlen(buf); 3120 if (i > LastArgv - p - 2) { 3121 i = LastArgv - p - 2; 3122 buf[i] = '\0'; 3123 } 3124 bp = buf; 3125 while (ch = *bp++) 3126 if (ch != '\n' && ch != '\r') 3127 *p++ = ch; 3128 while (p < LastArgv) 3129 *p++ = ' '; 3130 } 3131 #endif /* OLD_SETPROCTITLE */ 3132 3133 static void 3134 logxfer(char *name, off_t size, time_t start) 3135 { 3136 char buf[1024]; 3137 char path[MAXPATHLEN + 1]; 3138 time_t now; 3139 3140 if (statfd >= 0 && getwd(path) != NULL) { 3141 time(&now); 3142 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n", 3143 ctime(&now)+4, ident, remotehost, 3144 path, name, (long long)size, 3145 (long)(now - start + (now == start))); 3146 write(statfd, buf, strlen(buf)); 3147 } 3148 } 3149 3150 static char * 3151 doublequote(char *s) 3152 { 3153 int n; 3154 char *p, *s2; 3155 3156 for (p = s, n = 0; *p; p++) 3157 if (*p == '"') 3158 n++; 3159 3160 if ((s2 = malloc(p - s + n + 1)) == NULL) 3161 return (NULL); 3162 3163 for (p = s2; *s; s++, p++) { 3164 if ((*p = *s) == '"') 3165 *(++p) = '"'; 3166 } 3167 *p = '\0'; 3168 3169 return (s2); 3170 } 3171 3172 /* setup server socket for specified address family */ 3173 /* if af is PF_UNSPEC more than one socket may be returned */ 3174 /* the returned list is dynamically allocated, so caller needs to free it */ 3175 static int * 3176 socksetup(int af, char *bindname, const char *bindport) 3177 { 3178 struct addrinfo hints, *res, *r; 3179 int error, maxs, *s, *socks; 3180 const int on = 1; 3181 3182 memset(&hints, 0, sizeof(hints)); 3183 hints.ai_flags = AI_PASSIVE; 3184 hints.ai_family = af; 3185 hints.ai_socktype = SOCK_STREAM; 3186 error = getaddrinfo(bindname, bindport, &hints, &res); 3187 if (error) { 3188 syslog(LOG_ERR, "%s", gai_strerror(error)); 3189 if (error == EAI_SYSTEM) 3190 syslog(LOG_ERR, "%s", strerror(errno)); 3191 return NULL; 3192 } 3193 3194 /* Count max number of sockets we may open */ 3195 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3196 ; 3197 socks = malloc((maxs + 1) * sizeof(int)); 3198 if (!socks) { 3199 freeaddrinfo(res); 3200 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3201 return NULL; 3202 } 3203 3204 *socks = 0; /* num of sockets counter at start of array */ 3205 s = socks + 1; 3206 for (r = res; r; r = r->ai_next) { 3207 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3208 if (*s < 0) { 3209 syslog(LOG_DEBUG, "control socket: %m"); 3210 continue; 3211 } 3212 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3213 &on, sizeof(on)) < 0) 3214 syslog(LOG_WARNING, 3215 "control setsockopt (SO_REUSEADDR): %m"); 3216 if (r->ai_family == AF_INET6) { 3217 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3218 &on, sizeof(on)) < 0) 3219 syslog(LOG_WARNING, 3220 "control setsockopt (IPV6_V6ONLY): %m"); 3221 } 3222 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3223 syslog(LOG_DEBUG, "control bind: %m"); 3224 close(*s); 3225 continue; 3226 } 3227 (*socks)++; 3228 s++; 3229 } 3230 3231 if (res) 3232 freeaddrinfo(res); 3233 3234 if (*socks == 0) { 3235 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3236 free(socks); 3237 return NULL; 3238 } 3239 return(socks); 3240 } 3241