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