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 * @(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)ftpd.c 8.4 (Berkeley) 4/16/94 35 */ 36 37 #if 0 38 static const char rcsid[] = 39 "$FreeBSD: src/libexec/ftpd/ftpd.c,v 1.62.2.48 2003/02/14 12:42:42 yar Exp $"; 40 "$DragonFly: src/libexec/ftpd/ftpd.c,v 1.7 2005/10/28 18:06:57 joerg Exp $"; 41 #endif /* not lint */ 42 43 /* 44 * FTP server. 45 */ 46 #include <sys/param.h> 47 #include <sys/ioctl.h> 48 #include <sys/mman.h> 49 #include <sys/socket.h> 50 #include <sys/stat.h> 51 #include <sys/time.h> 52 #include <sys/wait.h> 53 54 #include <netinet/in.h> 55 #include <netinet/in_systm.h> 56 #include <netinet/ip.h> 57 #include <netinet/tcp.h> 58 59 #define FTP_NAMES 60 #include <arpa/ftp.h> 61 #include <arpa/inet.h> 62 #include <arpa/telnet.h> 63 64 #include <ctype.h> 65 #include <dirent.h> 66 #include <err.h> 67 #include <errno.h> 68 #include <fcntl.h> 69 #include <glob.h> 70 #include <limits.h> 71 #include <netdb.h> 72 #include <pwd.h> 73 #include <grp.h> 74 #include <signal.h> 75 #include <stdio.h> 76 #include <stdlib.h> 77 #include <string.h> 78 #include <syslog.h> 79 #include <time.h> 80 #include <unistd.h> 81 #include <libutil.h> 82 #ifdef LOGIN_CAP 83 #include <login_cap.h> 84 #endif 85 86 #ifdef SKEY 87 #include <skey.h> 88 #endif 89 90 #if !defined(NOPAM) 91 #include <security/pam_appl.h> 92 #endif 93 94 #include "pathnames.h" 95 #include "extern.h" 96 97 #if __STDC__ 98 #include <stdarg.h> 99 #else 100 #include <varargs.h> 101 #endif 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 server_addr; 110 union sockunion ctrl_addr; 111 union sockunion data_source; 112 union sockunion data_dest; 113 union sockunion his_addr; 114 union sockunion pasv_addr; 115 116 int daemon_mode; 117 int data; 118 int dataport; 119 int hostinfo = 1; /* print host-specific info in messages */ 120 int logged_in; 121 struct passwd *pw; 122 char *homedir; 123 int ftpdebug; 124 int timeout = 900; /* timeout after 15 minutes of inactivity */ 125 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 126 int logging; 127 int restricted_data_ports = 1; 128 int paranoid = 1; /* be extra careful about security */ 129 int anon_only = 0; /* Only anonymous ftp allowed */ 130 int guest; 131 int dochroot; 132 int dowtmp = 1; 133 int stats; 134 int statfd = -1; 135 int type; 136 int form; 137 int stru; /* avoid C keyword */ 138 int mode; 139 int usedefault = 1; /* for data transfers */ 140 int pdata = -1; /* for passive mode */ 141 int readonly=0; /* Server is in readonly mode. */ 142 int noepsv=0; /* EPSV command is disabled. */ 143 int noretr=0; /* RETR command is disabled. */ 144 int noguestretr=0; /* RETR command is disabled for anon users. */ 145 int noguestmkd=0; /* MKD command is disabled for anon users. */ 146 int noguestmod=1; /* anon users may not modify existing files. */ 147 148 static volatile sig_atomic_t recvurg; 149 sig_atomic_t transflag; 150 off_t file_size; 151 off_t byte_count; 152 #if !defined(CMASK) || CMASK == 0 153 #undef CMASK 154 #define CMASK 027 155 #endif 156 int defumask = CMASK; /* default umask value */ 157 char tmpline[7]; 158 char *hostname; 159 int epsvall = 0; 160 161 #ifdef VIRTUAL_HOSTING 162 char *ftpuser; 163 164 static struct ftphost { 165 struct ftphost *next; 166 struct addrinfo *hostinfo; 167 char *hostname; 168 char *anonuser; 169 char *statfile; 170 char *welcome; 171 char *loginmsg; 172 } *thishost, *firsthost; 173 174 #endif 175 char remotehost[MAXHOSTNAMELEN]; 176 char *ident = NULL; 177 178 static char ttyline[20]; 179 char *tty = ttyline; /* for klogin */ 180 181 #if !defined(NOPAM) 182 static int auth_pam (struct passwd**, const char*); 183 #endif 184 185 char *pid_file = NULL; 186 187 /* 188 * Limit number of pathnames that glob can return. 189 * A limit of 0 indicates the number of pathnames is unlimited. 190 */ 191 #define MAXGLOBARGS 16384 192 # 193 194 /* 195 * Timeout intervals for retrying connections 196 * to hosts that don't accept PORT cmds. This 197 * is a kludge, but given the problems with TCP... 198 */ 199 #define SWAITMAX 90 /* wait at most 90 seconds */ 200 #define SWAITINT 5 /* interval between retries */ 201 202 int swaitmax = SWAITMAX; 203 int swaitint = SWAITINT; 204 205 #ifdef SETPROCTITLE 206 #ifdef OLD_SETPROCTITLE 207 char **Argv = NULL; /* pointer to argument vector */ 208 char *LastArgv = NULL; /* end of argv */ 209 #endif /* OLD_SETPROCTITLE */ 210 char proctitle[LINE_MAX]; /* initial part of title */ 211 #endif /* SETPROCTITLE */ 212 213 #ifdef SKEY 214 int pwok = 0; 215 #endif 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 *); 260 261 static char * 262 curdir() 263 { 264 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 265 266 if (getcwd(path, sizeof(path)-2) == NULL) 267 return (""); 268 if (path[1] != '\0') /* special case for root dir. */ 269 strcat(path, "/"); 270 /* For guest account, skip / since it's chrooted */ 271 return (guest ? path+1 : path); 272 } 273 274 int 275 main(argc, argv, envp) 276 int argc; 277 char *argv[]; 278 char **envp; 279 { 280 int addrlen, ch, on = 1, tos; 281 char *cp, line[LINE_MAX]; 282 FILE *fd; 283 int error; 284 char *bindname = NULL; 285 const char *bindport = "ftp"; 286 int family = AF_UNSPEC; 287 int enable_v4 = 0; 288 struct sigaction sa; 289 290 tzset(); /* in case no timezone database in ~ftp */ 291 sigemptyset(&sa.sa_mask); 292 sa.sa_flags = SA_RESTART; 293 294 #ifdef OLD_SETPROCTITLE 295 /* 296 * Save start and extent of argv for setproctitle. 297 */ 298 Argv = argv; 299 while (*envp) 300 envp++; 301 LastArgv = envp[-1] + strlen(envp[-1]); 302 #endif /* OLD_SETPROCTITLE */ 303 304 305 while ((ch = getopt(argc, argv, 306 "46a:AdDEH:hlmMoOp:P:rRSt:T:u:UvW")) != -1) { 307 switch (ch) { 308 case '4': 309 enable_v4 = 1; 310 if (family == AF_UNSPEC) 311 family = AF_INET; 312 break; 313 314 case '6': 315 family = AF_INET6; 316 break; 317 318 case 'a': 319 bindname = optarg; 320 break; 321 322 case 'A': 323 anon_only = 1; 324 break; 325 326 case 'd': 327 ftpdebug++; 328 break; 329 330 case 'D': 331 daemon_mode++; 332 break; 333 334 case 'E': 335 noepsv = 1; 336 break; 337 338 case 'h': 339 hostinfo = 0; 340 break; 341 342 case 'H': 343 hostname = optarg; 344 break; 345 346 case 'l': 347 logging++; /* > 1 == extra logging */ 348 break; 349 350 case 'm': 351 noguestmod = 0; 352 break; 353 354 case 'M': 355 noguestmkd = 1; 356 break; 357 358 case 'o': 359 noretr = 1; 360 break; 361 362 case 'O': 363 noguestretr = 1; 364 break; 365 366 case 'p': 367 pid_file = optarg; 368 break; 369 370 case 'P': 371 bindport = optarg; 372 break; 373 374 case 'r': 375 readonly = 1; 376 break; 377 378 case 'R': 379 paranoid = 0; 380 break; 381 382 case 'S': 383 stats++; 384 break; 385 386 case 't': 387 timeout = atoi(optarg); 388 if (maxtimeout < timeout) 389 maxtimeout = timeout; 390 break; 391 392 case 'T': 393 maxtimeout = atoi(optarg); 394 if (timeout > maxtimeout) 395 timeout = maxtimeout; 396 break; 397 398 case 'u': 399 { 400 long val = 0; 401 402 val = strtol(optarg, &optarg, 8); 403 if (*optarg != '\0' || val < 0) 404 warnx("bad value for -u"); 405 else 406 defumask = val; 407 break; 408 } 409 case 'U': 410 restricted_data_ports = 0; 411 break; 412 413 case 'v': 414 ftpdebug++; 415 break; 416 417 case 'W': 418 dowtmp = 0; 419 break; 420 421 default: 422 warnx("unknown flag -%c ignored", optopt); 423 break; 424 } 425 } 426 427 #ifdef VIRTUAL_HOSTING 428 inithosts(); 429 #endif 430 (void) freopen(_PATH_DEVNULL, "w", stderr); 431 432 /* 433 * LOG_NDELAY sets up the logging connection immediately, 434 * necessary for anonymous ftp's that chroot and can't do it later. 435 */ 436 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 437 438 if (daemon_mode) { 439 int ctl_sock, fd; 440 struct addrinfo hints, *res; 441 442 /* 443 * Detach from parent. 444 */ 445 if (daemon(1, 1) < 0) { 446 syslog(LOG_ERR, "failed to become a daemon"); 447 exit(1); 448 } 449 sa.sa_handler = reapchild; 450 (void)sigaction(SIGCHLD, &sa, NULL); 451 /* init bind_sa */ 452 memset(&hints, 0, sizeof(hints)); 453 454 hints.ai_family = family == AF_UNSPEC ? AF_INET : family; 455 hints.ai_socktype = SOCK_STREAM; 456 hints.ai_protocol = 0; 457 hints.ai_flags = AI_PASSIVE; 458 error = getaddrinfo(bindname, bindport, &hints, &res); 459 if (error) { 460 if (family == AF_UNSPEC) { 461 hints.ai_family = AF_UNSPEC; 462 error = getaddrinfo(bindname, bindport, &hints, 463 &res); 464 } 465 } 466 if (error) { 467 syslog(LOG_ERR, "%s", gai_strerror(error)); 468 if (error == EAI_SYSTEM) 469 syslog(LOG_ERR, "%s", strerror(errno)); 470 exit(1); 471 } 472 if (res->ai_addr == NULL) { 473 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 474 exit(1); 475 } else 476 family = res->ai_addr->sa_family; 477 /* 478 * Open a socket, bind it to the FTP port, and start 479 * listening. 480 */ 481 ctl_sock = socket(family, SOCK_STREAM, 0); 482 if (ctl_sock < 0) { 483 syslog(LOG_ERR, "control socket: %m"); 484 exit(1); 485 } 486 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 487 &on, sizeof(on)) < 0) 488 syslog(LOG_WARNING, 489 "control setsockopt (SO_REUSEADDR): %m"); 490 if (family == AF_INET6 && enable_v4 == 0) { 491 if (setsockopt(ctl_sock, IPPROTO_IPV6, IPV6_V6ONLY, 492 &on, sizeof (on)) < 0) 493 syslog(LOG_WARNING, 494 "control setsockopt (IPV6_V6ONLY): %m"); 495 } 496 memcpy(&server_addr, res->ai_addr, res->ai_addr->sa_len); 497 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 498 server_addr.su_len) < 0) { 499 syslog(LOG_ERR, "control bind: %m"); 500 exit(1); 501 } 502 if (listen(ctl_sock, 32) < 0) { 503 syslog(LOG_ERR, "control listen: %m"); 504 exit(1); 505 } 506 /* 507 * Atomically write process ID 508 */ 509 if (pid_file) 510 { 511 int fd; 512 char buf[20]; 513 514 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 515 | O_NONBLOCK | O_EXLOCK, 0644); 516 if (fd < 0) { 517 if (errno == EAGAIN) 518 errx(1, "%s: file locked", pid_file); 519 else 520 err(1, "%s", pid_file); 521 } 522 snprintf(buf, sizeof(buf), 523 "%lu\n", (unsigned long) getpid()); 524 if (write(fd, buf, strlen(buf)) < 0) 525 err(1, "%s: write", pid_file); 526 /* Leave the pid file open and locked */ 527 } 528 /* 529 * Loop forever accepting connection requests and forking off 530 * children to handle them. 531 */ 532 while (1) { 533 addrlen = server_addr.su_len; 534 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen); 535 536 if (fd >= 0) { 537 if (fork() == 0) { 538 /* child */ 539 (void) dup2(fd, 0); 540 (void) dup2(fd, 1); 541 close(ctl_sock); 542 break; 543 } 544 close(fd); 545 } 546 } 547 } else { 548 addrlen = sizeof(his_addr); 549 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 550 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 551 exit(1); 552 } 553 } 554 555 sa.sa_handler = SIG_DFL; 556 (void)sigaction(SIGCHLD, &sa, NULL); 557 558 sa.sa_handler = sigurg; 559 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 560 (void)sigaction(SIGURG, &sa, NULL); 561 562 sigfillset(&sa.sa_mask); /* block all signals in handler */ 563 sa.sa_flags = SA_RESTART; 564 sa.sa_handler = sigquit; 565 (void)sigaction(SIGHUP, &sa, NULL); 566 (void)sigaction(SIGINT, &sa, NULL); 567 (void)sigaction(SIGQUIT, &sa, NULL); 568 (void)sigaction(SIGTERM, &sa, NULL); 569 570 sa.sa_handler = lostconn; 571 (void)sigaction(SIGPIPE, &sa, NULL); 572 573 addrlen = sizeof(ctrl_addr); 574 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 575 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 576 exit(1); 577 } 578 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 579 #ifdef VIRTUAL_HOSTING 580 /* select our identity from virtual host table */ 581 selecthost(&ctrl_addr); 582 #endif 583 #ifdef IP_TOS 584 if (ctrl_addr.su_family == AF_INET) 585 { 586 tos = IPTOS_LOWDELAY; 587 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 588 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 589 } 590 #endif 591 /* 592 * Disable Nagle on the control channel so that we don't have to wait 593 * for peer's ACK before issuing our next reply. 594 */ 595 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 596 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 597 598 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 599 600 /* set this here so klogin can use it... */ 601 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 602 603 /* Try to handle urgent data inline */ 604 #ifdef SO_OOBINLINE 605 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 606 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 607 #endif 608 609 #ifdef F_SETOWN 610 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 611 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 612 #endif 613 dolog((struct sockaddr *)&his_addr); 614 /* 615 * Set up default state 616 */ 617 data = -1; 618 type = TYPE_A; 619 form = FORM_N; 620 stru = STRU_F; 621 mode = MODE_S; 622 tmpline[0] = '\0'; 623 624 /* If logins are disabled, print out the message. */ 625 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 626 while (fgets(line, sizeof(line), fd) != NULL) { 627 if ((cp = strchr(line, '\n')) != NULL) 628 *cp = '\0'; 629 lreply(530, "%s", line); 630 } 631 (void) fflush(stdout); 632 (void) fclose(fd); 633 reply(530, "System not available."); 634 exit(0); 635 } 636 #ifdef VIRTUAL_HOSTING 637 if ((fd = fopen(thishost->welcome, "r")) != NULL) { 638 #else 639 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 640 #endif 641 while (fgets(line, sizeof(line), fd) != NULL) { 642 if ((cp = strchr(line, '\n')) != NULL) 643 *cp = '\0'; 644 lreply(220, "%s", line); 645 } 646 (void) fflush(stdout); 647 (void) fclose(fd); 648 /* reply(220,) must follow */ 649 } 650 #ifndef VIRTUAL_HOSTING 651 if (hostname == NULL) { 652 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 653 fatalerror("Ran out of memory."); 654 gethostname(hostname, MAXHOSTNAMELEN - 1); 655 hostname[MAXHOSTNAMELEN - 1] = '\0'; 656 } 657 #endif 658 if (hostinfo) 659 reply(220, "%s FTP server (%s) ready.", hostname, version); 660 else 661 reply(220, "FTP server ready."); 662 for (;;) 663 (void) yyparse(); 664 /* NOTREACHED */ 665 } 666 667 static void 668 lostconn(signo) 669 int signo; 670 { 671 672 if (ftpdebug) 673 syslog(LOG_DEBUG, "lost connection"); 674 dologout(1); 675 } 676 677 static void 678 sigquit(signo) 679 int signo; 680 { 681 682 syslog(LOG_ERR, "got signal %d", signo); 683 dologout(1); 684 } 685 686 #ifdef VIRTUAL_HOSTING 687 /* 688 * read in virtual host tables (if they exist) 689 */ 690 691 static void 692 inithosts() 693 { 694 int insert; 695 size_t len; 696 FILE *fp; 697 char *cp, *mp, *line; 698 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 699 struct ftphost *hrp, *lhrp; 700 struct addrinfo hints, *res, *ai; 701 702 /* 703 * Fill in the default host information 704 */ 705 if (hostname == NULL) { 706 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 707 fatalerror("Ran out of memory."); 708 if (gethostname(hostname, MAXHOSTNAMELEN) < 0) 709 hostname[0] = '\0'; 710 hostname[MAXHOSTNAMELEN - 1] = '\0'; 711 } 712 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 713 fatalerror("Ran out of memory."); 714 hrp->hostname = hostname; 715 hrp->hostinfo = NULL; 716 717 memset(&hints, 0, sizeof(hints)); 718 hints.ai_flags = AI_CANONNAME; 719 hints.ai_family = AF_UNSPEC; 720 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 721 hrp->hostinfo = res; 722 hrp->statfile = _PATH_FTPDSTATFILE; 723 hrp->welcome = _PATH_FTPWELCOME; 724 hrp->loginmsg = _PATH_FTPLOGINMESG; 725 hrp->anonuser = "ftp"; 726 hrp->next = NULL; 727 thishost = firsthost = lhrp = hrp; 728 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 729 int addrsize, gothost; 730 void *addr; 731 struct hostent *hp; 732 733 while ((line = fgetln(fp, &len)) != NULL) { 734 int i, hp_error; 735 736 /* skip comments */ 737 if (line[0] == '#') 738 continue; 739 if (line[len - 1] == '\n') { 740 line[len - 1] = '\0'; 741 mp = NULL; 742 } else { 743 if ((mp = malloc(len + 1)) == NULL) 744 fatalerror("Ran out of memory."); 745 memcpy(mp, line, len); 746 mp[len] = '\0'; 747 line = mp; 748 } 749 cp = strtok(line, " \t"); 750 /* skip empty lines */ 751 if (cp == NULL) 752 goto nextline; 753 vhost = cp; 754 755 /* set defaults */ 756 anonuser = "ftp"; 757 statfile = _PATH_FTPDSTATFILE; 758 welcome = _PATH_FTPWELCOME; 759 loginmsg = _PATH_FTPLOGINMESG; 760 761 /* 762 * Preparse the line so we can use its info 763 * for all the addresses associated with 764 * the virtual host name. 765 * Field 0, the virtual host name, is special: 766 * it's already parsed off and will be strdup'ed 767 * later, after we know its canonical form. 768 */ 769 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 770 if (*cp != '-' && (cp = strdup(cp))) 771 switch (i) { 772 case 1: /* anon user permissions */ 773 anonuser = cp; 774 break; 775 case 2: /* statistics file */ 776 statfile = cp; 777 break; 778 case 3: /* welcome message */ 779 welcome = cp; 780 break; 781 case 4: /* login message */ 782 loginmsg = cp; 783 break; 784 default: /* programming error */ 785 abort(); 786 /* NOTREACHED */ 787 } 788 789 hints.ai_flags = 0; 790 hints.ai_family = AF_UNSPEC; 791 hints.ai_flags = AI_PASSIVE; 792 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 793 goto nextline; 794 for (ai = res; ai != NULL && ai->ai_addr != NULL; 795 ai = ai->ai_next) { 796 797 gothost = 0; 798 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 799 struct addrinfo *hi; 800 801 for (hi = hrp->hostinfo; hi != NULL; 802 hi = hi->ai_next) 803 if (hi->ai_addrlen == ai->ai_addrlen && 804 memcmp(hi->ai_addr, 805 ai->ai_addr, 806 ai->ai_addr->sa_len) == 0) { 807 gothost++; 808 break; 809 } 810 if (gothost) 811 break; 812 } 813 if (hrp == NULL) { 814 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 815 goto nextline; 816 hrp->hostname = NULL; 817 insert = 1; 818 } else { 819 if (hrp->hostinfo && hrp->hostinfo != res) 820 freeaddrinfo(hrp->hostinfo); 821 insert = 0; /* host already in the chain */ 822 } 823 hrp->hostinfo = res; 824 825 /* 826 * determine hostname to use. 827 * force defined name if there is a valid alias 828 * otherwise fallback to primary hostname 829 */ 830 /* XXX: getaddrinfo() can't do alias check */ 831 switch(hrp->hostinfo->ai_family) { 832 case AF_INET: 833 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 834 addrsize = sizeof(struct in_addr); 835 break; 836 case AF_INET6: 837 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 838 addrsize = sizeof(struct in6_addr); 839 break; 840 default: 841 /* should not reach here */ 842 freeaddrinfo(hrp->hostinfo); 843 if (insert) 844 free(hrp); /*not in chain, can free*/ 845 else 846 hrp->hostinfo = NULL; /*mark as blank*/ 847 goto nextline; 848 /* NOTREACHED */ 849 } 850 if ((hp = getipnodebyaddr(addr, addrsize, 851 hrp->hostinfo->ai_family, 852 &hp_error)) != NULL) { 853 if (strcmp(vhost, hp->h_name) != 0) { 854 if (hp->h_aliases == NULL) 855 vhost = hp->h_name; 856 else { 857 i = 0; 858 while (hp->h_aliases[i] && 859 strcmp(vhost, hp->h_aliases[i]) != 0) 860 ++i; 861 if (hp->h_aliases[i] == NULL) 862 vhost = hp->h_name; 863 } 864 } 865 } 866 if (hrp->hostname && 867 strcmp(hrp->hostname, vhost) != 0) { 868 free(hrp->hostname); 869 hrp->hostname = NULL; 870 } 871 if (hrp->hostname == NULL && 872 (hrp->hostname = strdup(vhost)) == NULL) { 873 freeaddrinfo(hrp->hostinfo); 874 hrp->hostinfo = NULL; /* mark as blank */ 875 if (hp) 876 freehostent(hp); 877 goto nextline; 878 } 879 hrp->anonuser = anonuser; 880 hrp->statfile = statfile; 881 hrp->welcome = welcome; 882 hrp->loginmsg = loginmsg; 883 if (insert) { 884 hrp->next = NULL; 885 lhrp->next = hrp; 886 lhrp = hrp; 887 } 888 if (hp) 889 freehostent(hp); 890 } 891 nextline: 892 if (mp) 893 free(mp); 894 } 895 (void) fclose(fp); 896 } 897 } 898 899 static void 900 selecthost(su) 901 union sockunion *su; 902 { 903 struct ftphost *hrp; 904 u_int16_t port; 905 #ifdef INET6 906 struct in6_addr *mapped_in6 = NULL; 907 #endif 908 struct addrinfo *hi; 909 910 #ifdef INET6 911 /* 912 * XXX IPv4 mapped IPv6 addr consideraton, 913 * specified in rfc2373. 914 */ 915 if (su->su_family == AF_INET6 && 916 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 917 mapped_in6 = &su->su_sin6.sin6_addr; 918 #endif 919 920 hrp = thishost = firsthost; /* default */ 921 port = su->su_port; 922 su->su_port = 0; 923 while (hrp != NULL) { 924 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 925 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 926 thishost = hrp; 927 break; 928 } 929 #ifdef INET6 930 /* XXX IPv4 mapped IPv6 addr consideraton */ 931 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 932 (memcmp(&mapped_in6->s6_addr[12], 933 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 934 sizeof(struct in_addr)) == 0)) { 935 thishost = hrp; 936 break; 937 } 938 #endif 939 } 940 hrp = hrp->next; 941 } 942 su->su_port = port; 943 /* setup static variables as appropriate */ 944 hostname = thishost->hostname; 945 ftpuser = thishost->anonuser; 946 } 947 #endif 948 949 /* 950 * Helper function for sgetpwnam(). 951 */ 952 static char * 953 sgetsave(s) 954 char *s; 955 { 956 char *new = malloc((unsigned) strlen(s) + 1); 957 958 if (new == NULL) { 959 perror_reply(421, "Local resource failure: malloc"); 960 dologout(1); 961 /* NOTREACHED */ 962 } 963 (void) strcpy(new, s); 964 return (new); 965 } 966 967 /* 968 * Save the result of a getpwnam. Used for USER command, since 969 * the data returned must not be clobbered by any other command 970 * (e.g., globbing). 971 */ 972 static struct passwd * 973 sgetpwnam(name) 974 char *name; 975 { 976 static struct passwd save; 977 struct passwd *p; 978 979 if ((p = getpwnam(name)) == NULL) 980 return (p); 981 if (save.pw_name) { 982 free(save.pw_name); 983 free(save.pw_passwd); 984 free(save.pw_gecos); 985 free(save.pw_dir); 986 free(save.pw_shell); 987 } 988 save = *p; 989 save.pw_name = sgetsave(p->pw_name); 990 save.pw_passwd = sgetsave(p->pw_passwd); 991 save.pw_gecos = sgetsave(p->pw_gecos); 992 save.pw_dir = sgetsave(p->pw_dir); 993 save.pw_shell = sgetsave(p->pw_shell); 994 return (&save); 995 } 996 997 static int login_attempts; /* number of failed login attempts */ 998 static int askpasswd; /* had user command, ask for passwd */ 999 static char curname[MAXLOGNAME]; /* current USER name */ 1000 1001 /* 1002 * USER command. 1003 * Sets global passwd pointer pw if named account exists and is acceptable; 1004 * sets askpasswd if a PASS command is expected. If logged in previously, 1005 * need to reset state. If name is "ftp" or "anonymous", the name is not in 1006 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 1007 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 1008 * requesting login privileges. Disallow anyone who does not have a standard 1009 * shell as returned by getusershell(). Disallow anyone mentioned in the file 1010 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 1011 */ 1012 void 1013 user(name) 1014 char *name; 1015 { 1016 char *cp, *shell; 1017 1018 if (logged_in) { 1019 if (guest) { 1020 reply(530, "Can't change user from guest login."); 1021 return; 1022 } else if (dochroot) { 1023 reply(530, "Can't change user from chroot user."); 1024 return; 1025 } 1026 end_login(); 1027 } 1028 1029 guest = 0; 1030 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1031 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 1032 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 1033 reply(530, "User %s access denied.", name); 1034 #ifdef VIRTUAL_HOSTING 1035 else if ((pw = sgetpwnam(thishost->anonuser)) != NULL) { 1036 #else 1037 else if ((pw = sgetpwnam("ftp")) != NULL) { 1038 #endif 1039 guest = 1; 1040 askpasswd = 1; 1041 reply(331, 1042 "Guest login ok, send your email address as password."); 1043 } else 1044 reply(530, "User %s unknown.", name); 1045 if (!askpasswd && logging) 1046 syslog(LOG_NOTICE, 1047 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1048 return; 1049 } 1050 if (anon_only != 0) { 1051 reply(530, "Sorry, only anonymous ftp allowed."); 1052 return; 1053 } 1054 1055 if ((pw = sgetpwnam(name))) { 1056 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1057 shell = _PATH_BSHELL; 1058 while ((cp = getusershell()) != NULL) 1059 if (strcmp(cp, shell) == 0) 1060 break; 1061 endusershell(); 1062 1063 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1064 reply(530, "User %s access denied.", name); 1065 if (logging) 1066 syslog(LOG_NOTICE, 1067 "FTP LOGIN REFUSED FROM %s, %s", 1068 remotehost, name); 1069 pw = (struct passwd *) NULL; 1070 return; 1071 } 1072 } 1073 if (logging) 1074 strncpy(curname, name, sizeof(curname)-1); 1075 #ifdef SKEY 1076 pwok = skeyaccess(name, NULL, remotehost, remotehost); 1077 reply(331, "%s", skey_challenge(name, pw, pwok)); 1078 #else 1079 reply(331, "Password required for %s.", name); 1080 #endif 1081 askpasswd = 1; 1082 /* 1083 * Delay before reading passwd after first failed 1084 * attempt to slow down passwd-guessing programs. 1085 */ 1086 if (login_attempts) 1087 sleep((unsigned) login_attempts); 1088 } 1089 1090 /* 1091 * Check if a user is in the file "fname", 1092 * return a pointer to a malloc'd string with the rest 1093 * of the matching line in "residue" if not NULL. 1094 */ 1095 static int 1096 checkuser(fname, name, pwset, residue) 1097 char *fname; 1098 char *name; 1099 int pwset; 1100 char **residue; 1101 { 1102 FILE *fd; 1103 int found = 0; 1104 size_t len; 1105 char *line, *mp, *p; 1106 1107 if ((fd = fopen(fname, "r")) != NULL) { 1108 while (!found && (line = fgetln(fd, &len)) != NULL) { 1109 /* skip comments */ 1110 if (line[0] == '#') 1111 continue; 1112 if (line[len - 1] == '\n') { 1113 line[len - 1] = '\0'; 1114 mp = NULL; 1115 } else { 1116 if ((mp = malloc(len + 1)) == NULL) 1117 fatalerror("Ran out of memory."); 1118 memcpy(mp, line, len); 1119 mp[len] = '\0'; 1120 line = mp; 1121 } 1122 /* avoid possible leading and trailing whitespace */ 1123 p = strtok(line, " \t"); 1124 /* skip empty lines */ 1125 if (p == NULL) 1126 goto nextline; 1127 /* 1128 * if first chr is '@', check group membership 1129 */ 1130 if (p[0] == '@') { 1131 int i = 0; 1132 struct group *grp; 1133 1134 if (p[1] == '\0') /* single @ matches anyone */ 1135 found = 1; 1136 else { 1137 if ((grp = getgrnam(p+1)) == NULL) 1138 goto nextline; 1139 /* 1140 * Check user's default group 1141 */ 1142 if (pwset && grp->gr_gid == pw->pw_gid) 1143 found = 1; 1144 /* 1145 * Check supplementary groups 1146 */ 1147 while (!found && grp->gr_mem[i]) 1148 found = strcmp(name, 1149 grp->gr_mem[i++]) 1150 == 0; 1151 } 1152 } 1153 /* 1154 * Otherwise, just check for username match 1155 */ 1156 else 1157 found = strcmp(p, name) == 0; 1158 /* 1159 * Save the rest of line to "residue" if matched 1160 */ 1161 if (found && residue) { 1162 if ((p = strtok(NULL, "")) != NULL) 1163 p += strspn(p, " \t"); 1164 if (p && *p) { 1165 if ((*residue = strdup(p)) == NULL) 1166 fatalerror("Ran out of memory."); 1167 } else 1168 *residue = NULL; 1169 } 1170 nextline: 1171 if (mp) 1172 free(mp); 1173 } 1174 (void) fclose(fd); 1175 } 1176 return (found); 1177 } 1178 1179 /* 1180 * Terminate login as previous user, if any, resetting state; 1181 * used when USER command is given or login fails. 1182 */ 1183 static void 1184 end_login() 1185 { 1186 1187 (void) seteuid((uid_t)0); 1188 if (logged_in && dowtmp) 1189 ftpd_logwtmp(ttyline, "", NULL); 1190 pw = NULL; 1191 #ifdef LOGIN_CAP 1192 setusercontext(NULL, getpwuid(0), (uid_t)0, 1193 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1194 #endif 1195 logged_in = 0; 1196 guest = 0; 1197 dochroot = 0; 1198 } 1199 1200 #if !defined(NOPAM) 1201 1202 /* 1203 * the following code is stolen from imap-uw PAM authentication module and 1204 * login.c 1205 */ 1206 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1207 1208 struct cred_t { 1209 const char *uname; /* user name */ 1210 const char *pass; /* password */ 1211 }; 1212 typedef struct cred_t cred_t; 1213 1214 static int 1215 auth_conv(int num_msg, const struct pam_message **msg, 1216 struct pam_response **resp, void *appdata) 1217 { 1218 int i; 1219 cred_t *cred = (cred_t *) appdata; 1220 struct pam_response *reply = 1221 malloc(sizeof(struct pam_response) * num_msg); 1222 1223 for (i = 0; i < num_msg; i++) { 1224 switch (msg[i]->msg_style) { 1225 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1226 reply[i].resp_retcode = PAM_SUCCESS; 1227 reply[i].resp = COPY_STRING(cred->uname); 1228 /* PAM frees resp. */ 1229 break; 1230 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1231 reply[i].resp_retcode = PAM_SUCCESS; 1232 reply[i].resp = COPY_STRING(cred->pass); 1233 /* PAM frees resp. */ 1234 break; 1235 case PAM_TEXT_INFO: 1236 case PAM_ERROR_MSG: 1237 reply[i].resp_retcode = PAM_SUCCESS; 1238 reply[i].resp = NULL; 1239 break; 1240 default: /* unknown message style */ 1241 free(reply); 1242 return PAM_CONV_ERR; 1243 } 1244 } 1245 1246 *resp = reply; 1247 return PAM_SUCCESS; 1248 } 1249 1250 /* 1251 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1252 * authenticated, or 1 if not authenticated. If some sort of PAM system 1253 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1254 * function returns -1. This can be used as an indication that we should 1255 * fall back to a different authentication mechanism. 1256 */ 1257 static int 1258 auth_pam(struct passwd **ppw, const char *pass) 1259 { 1260 pam_handle_t *pamh = NULL; 1261 const char *tmpl_user; 1262 const void *item; 1263 int rval; 1264 int e; 1265 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1266 struct pam_conv conv = { &auth_conv, &auth_cred }; 1267 1268 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1269 if (e != PAM_SUCCESS) { 1270 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e)); 1271 return -1; 1272 } 1273 1274 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1275 if (e != PAM_SUCCESS) { 1276 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1277 pam_strerror(pamh, e)); 1278 return -1; 1279 } 1280 1281 e = pam_authenticate(pamh, 0); 1282 switch (e) { 1283 case PAM_SUCCESS: 1284 /* 1285 * With PAM we support the concept of a "template" 1286 * user. The user enters a login name which is 1287 * authenticated by PAM, usually via a remote service 1288 * such as RADIUS or TACACS+. If authentication 1289 * succeeds, a different but related "template" name 1290 * is used for setting the credentials, shell, and 1291 * home directory. The name the user enters need only 1292 * exist on the remote authentication server, but the 1293 * template name must be present in the local password 1294 * database. 1295 * 1296 * This is supported by two various mechanisms in the 1297 * individual modules. However, from the application's 1298 * point of view, the template user is always passed 1299 * back as a changed value of the PAM_USER item. 1300 */ 1301 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1302 PAM_SUCCESS) { 1303 tmpl_user = (const char *) item; 1304 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1305 *ppw = getpwnam(tmpl_user); 1306 } else 1307 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1308 pam_strerror(pamh, e)); 1309 rval = 0; 1310 break; 1311 1312 case PAM_AUTH_ERR: 1313 case PAM_USER_UNKNOWN: 1314 case PAM_MAXTRIES: 1315 rval = 1; 1316 break; 1317 1318 default: 1319 syslog(LOG_ERR, "auth_pam: %s", pam_strerror(pamh, e)); 1320 rval = -1; 1321 break; 1322 } 1323 1324 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1325 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1326 rval = -1; 1327 } 1328 return rval; 1329 } 1330 1331 #endif /* !defined(NOPAM) */ 1332 1333 void 1334 pass(passwd) 1335 char *passwd; 1336 { 1337 int rval; 1338 FILE *fd; 1339 #ifdef LOGIN_CAP 1340 login_cap_t *lc = NULL; 1341 #endif 1342 char *chrootdir; 1343 char *residue = NULL; 1344 1345 if (logged_in || askpasswd == 0) { 1346 reply(503, "Login with USER first."); 1347 return; 1348 } 1349 askpasswd = 0; 1350 if (!guest) { /* "ftp" is only account allowed no password */ 1351 if (pw == NULL) { 1352 rval = 1; /* failure below */ 1353 goto skip; 1354 } 1355 #if !defined(NOPAM) 1356 rval = auth_pam(&pw, passwd); 1357 if (rval >= 0) 1358 goto skip; 1359 #endif 1360 #ifdef SKEY 1361 if (pwok) 1362 rval = strcmp(pw->pw_passwd, 1363 crypt(passwd, pw->pw_passwd)); 1364 if (rval) 1365 rval = strcmp(pw->pw_passwd, 1366 skey_crypt(passwd, pw->pw_passwd, pw, pwok)); 1367 #else 1368 rval = strcmp(pw->pw_passwd, crypt(passwd, pw->pw_passwd)); 1369 #endif 1370 /* The strcmp does not catch null passwords! */ 1371 if (*pw->pw_passwd == '\0' || 1372 (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 #ifdef SKEY 1401 pwok = 0; 1402 #endif 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); 1435 #else 1436 setlogin(pw->pw_name); 1437 (void) initgroups(pw->pw_name, pw->pw_gid); 1438 #endif 1439 1440 /* open wtmp before chroot */ 1441 if (dowtmp) 1442 ftpd_logwtmp(ttyline, pw->pw_name, 1443 (struct sockaddr *)&his_addr); 1444 logged_in = 1; 1445 1446 if (guest && stats && statfd < 0) 1447 #ifdef VIRTUAL_HOSTING 1448 if ((statfd = open(thishost->statfile, O_WRONLY|O_APPEND)) < 0) 1449 #else 1450 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1451 #endif 1452 stats = 0; 1453 1454 dochroot = 1455 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1456 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1457 || login_getcapbool(lc, "ftp-chroot", 0) 1458 #endif 1459 ; 1460 chrootdir = NULL; 1461 /* 1462 * For a chrooted local user, 1463 * a) see whether ftpchroot(5) specifies a chroot directory, 1464 * b) extract the directory pathname from the line, 1465 * c) expand it to the absolute pathname if necessary. 1466 */ 1467 if (dochroot && residue && 1468 (chrootdir = strtok(residue, " \t")) != NULL && 1469 chrootdir[0] != '/') { 1470 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1471 if (chrootdir == NULL) 1472 fatalerror("Ran out of memory."); 1473 } 1474 if (guest || dochroot) { 1475 /* 1476 * If no chroot directory set yet, use the login directory. 1477 * Copy it so it can be modified while pw->pw_dir stays intact. 1478 */ 1479 if (chrootdir == NULL && 1480 (chrootdir = strdup(pw->pw_dir)) == NULL) 1481 fatalerror("Ran out of memory."); 1482 /* 1483 * Check for the "/chroot/./home" syntax, 1484 * separate the chroot and home directory pathnames. 1485 */ 1486 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1487 *(homedir++) = '\0'; /* wipe '/' */ 1488 homedir++; /* skip '.' */ 1489 /* so chrootdir can be freed later */ 1490 if ((homedir = strdup(homedir)) == NULL) 1491 fatalerror("Ran out of memory."); 1492 } else { 1493 /* 1494 * We MUST do a chdir() after the chroot. Otherwise 1495 * the old current directory will be accessible as "." 1496 * outside the new root! 1497 */ 1498 homedir = "/"; 1499 } 1500 /* 1501 * Finally, do chroot() 1502 */ 1503 if (chroot(chrootdir) < 0) { 1504 reply(550, "Can't change root."); 1505 goto bad; 1506 } 1507 } else /* real user w/o chroot */ 1508 homedir = pw->pw_dir; 1509 /* 1510 * Set euid *before* doing chdir() so 1511 * a) the user won't be carried to a directory that he couldn't reach 1512 * on his own due to no permission to upper path components, 1513 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1514 * (uid 0 has no root power over NFS if not mapped explicitly.) 1515 */ 1516 if (seteuid((uid_t)pw->pw_uid) < 0) { 1517 reply(550, "Can't set uid."); 1518 goto bad; 1519 } 1520 if (chdir(homedir) < 0) { 1521 if (guest || dochroot) { 1522 reply(550, "Can't change to base directory."); 1523 goto bad; 1524 } else { 1525 if (chdir("/") < 0) { 1526 reply(550, "Root is inaccessible."); 1527 goto bad; 1528 } 1529 lreply(230, "No directory! Logging in with home=/"); 1530 } 1531 } 1532 1533 /* 1534 * Display a login message, if it exists. 1535 * N.B. reply(230,) must follow the message. 1536 */ 1537 #ifdef VIRTUAL_HOSTING 1538 if ((fd = fopen(thishost->loginmsg, "r")) != NULL) { 1539 #else 1540 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 1541 #endif 1542 char *cp, line[LINE_MAX]; 1543 1544 while (fgets(line, sizeof(line), fd) != NULL) { 1545 if ((cp = strchr(line, '\n')) != NULL) 1546 *cp = '\0'; 1547 lreply(230, "%s", line); 1548 } 1549 (void) fflush(stdout); 1550 (void) fclose(fd); 1551 } 1552 if (guest) { 1553 if (ident != NULL) 1554 free(ident); 1555 ident = strdup(passwd); 1556 if (ident == NULL) 1557 fatalerror("Ran out of memory."); 1558 1559 reply(230, "Guest login ok, access restrictions apply."); 1560 #ifdef SETPROCTITLE 1561 #ifdef VIRTUAL_HOSTING 1562 if (thishost != firsthost) 1563 snprintf(proctitle, sizeof(proctitle), 1564 "%s: anonymous(%s)/%s", remotehost, hostname, 1565 passwd); 1566 else 1567 #endif 1568 snprintf(proctitle, sizeof(proctitle), 1569 "%s: anonymous/%s", remotehost, passwd); 1570 setproctitle("%s", proctitle); 1571 #endif /* SETPROCTITLE */ 1572 if (logging) 1573 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1574 remotehost, passwd); 1575 } else { 1576 if (dochroot) 1577 reply(230, "User %s logged in, " 1578 "access restrictions apply.", pw->pw_name); 1579 else 1580 reply(230, "User %s logged in.", pw->pw_name); 1581 1582 #ifdef SETPROCTITLE 1583 snprintf(proctitle, sizeof(proctitle), 1584 "%s: user/%s", remotehost, pw->pw_name); 1585 setproctitle("%s", proctitle); 1586 #endif /* SETPROCTITLE */ 1587 if (logging) 1588 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1589 remotehost, pw->pw_name); 1590 } 1591 #ifdef LOGIN_CAP 1592 login_close(lc); 1593 #endif 1594 if (chrootdir) 1595 free(chrootdir); 1596 if (residue) 1597 free(residue); 1598 return; 1599 bad: 1600 /* Forget all about it... */ 1601 #ifdef LOGIN_CAP 1602 login_close(lc); 1603 #endif 1604 if (chrootdir) 1605 free(chrootdir); 1606 if (residue) 1607 free(residue); 1608 end_login(); 1609 } 1610 1611 void 1612 retrieve(cmd, name) 1613 char *cmd, *name; 1614 { 1615 FILE *fin, *dout; 1616 struct stat st; 1617 int (*closefunc) (FILE *); 1618 time_t start; 1619 1620 if (cmd == 0) { 1621 fin = fopen(name, "r"), closefunc = fclose; 1622 st.st_size = 0; 1623 } else { 1624 char line[BUFSIZ]; 1625 1626 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1627 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1628 st.st_size = -1; 1629 st.st_blksize = BUFSIZ; 1630 } 1631 if (fin == NULL) { 1632 if (errno != 0) { 1633 perror_reply(550, name); 1634 if (cmd == 0) { 1635 LOGCMD("get", name); 1636 } 1637 } 1638 return; 1639 } 1640 byte_count = -1; 1641 if (cmd == 0) { 1642 if (fstat(fileno(fin), &st) < 0) { 1643 perror_reply(550, name); 1644 goto done; 1645 } 1646 if (!S_ISREG(st.st_mode)) { 1647 if (guest) { 1648 reply(550, "%s: not a plain file.", name); 1649 goto done; 1650 } 1651 st.st_size = -1; 1652 /* st.st_blksize is set for all descriptor types */ 1653 } 1654 } 1655 if (restart_point) { 1656 if (type == TYPE_A) { 1657 off_t i, n; 1658 int c; 1659 1660 n = restart_point; 1661 i = 0; 1662 while (i++ < n) { 1663 if ((c=getc(fin)) == EOF) { 1664 perror_reply(550, name); 1665 goto done; 1666 } 1667 if (c == '\n') 1668 i++; 1669 } 1670 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1671 perror_reply(550, name); 1672 goto done; 1673 } 1674 } 1675 dout = dataconn(name, st.st_size, "w"); 1676 if (dout == NULL) 1677 goto done; 1678 time(&start); 1679 send_data(fin, dout, st.st_blksize, st.st_size, 1680 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1681 if (cmd == 0 && guest && stats) 1682 logxfer(name, st.st_size, start); 1683 (void) fclose(dout); 1684 data = -1; 1685 pdata = -1; 1686 done: 1687 if (cmd == 0) 1688 LOGBYTES("get", name, byte_count); 1689 (*closefunc)(fin); 1690 } 1691 1692 void 1693 store(name, mode, unique) 1694 char *name, *mode; 1695 int unique; 1696 { 1697 int fd; 1698 FILE *fout, *din; 1699 int (*closefunc) (FILE *); 1700 1701 if (*mode == 'a') { /* APPE */ 1702 if (unique) { 1703 /* Programming error */ 1704 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1705 unique = 0; 1706 } 1707 if (guest && noguestmod) { 1708 reply(550, "Appending to existing file denied"); 1709 goto err; 1710 } 1711 restart_point = 0; /* not affected by preceding REST */ 1712 } 1713 if (unique) /* STOU overrides REST */ 1714 restart_point = 0; 1715 if (guest && noguestmod) { 1716 if (restart_point) { /* guest STOR w/REST */ 1717 reply(550, "Modifying existing file denied"); 1718 goto err; 1719 } else /* treat guest STOR as STOU */ 1720 unique = 1; 1721 } 1722 1723 if (restart_point) 1724 mode = "r+"; /* so ASCII manual seek can work */ 1725 if (unique) { 1726 if ((fd = guniquefd(name, &name)) < 0) 1727 goto err; 1728 fout = fdopen(fd, mode); 1729 } else 1730 fout = fopen(name, mode); 1731 closefunc = fclose; 1732 if (fout == NULL) { 1733 perror_reply(553, name); 1734 goto err; 1735 } 1736 byte_count = -1; 1737 if (restart_point) { 1738 if (type == TYPE_A) { 1739 off_t i, n; 1740 int c; 1741 1742 n = restart_point; 1743 i = 0; 1744 while (i++ < n) { 1745 if ((c=getc(fout)) == EOF) { 1746 perror_reply(550, name); 1747 goto done; 1748 } 1749 if (c == '\n') 1750 i++; 1751 } 1752 /* 1753 * We must do this seek to "current" position 1754 * because we are changing from reading to 1755 * writing. 1756 */ 1757 if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) { 1758 perror_reply(550, name); 1759 goto done; 1760 } 1761 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1762 perror_reply(550, name); 1763 goto done; 1764 } 1765 } 1766 din = dataconn(name, (off_t)-1, "r"); 1767 if (din == NULL) 1768 goto done; 1769 if (receive_data(din, fout) == 0) { 1770 if (unique) 1771 reply(226, "Transfer complete (unique file name:%s).", 1772 name); 1773 else 1774 reply(226, "Transfer complete."); 1775 } 1776 (void) fclose(din); 1777 data = -1; 1778 pdata = -1; 1779 done: 1780 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1781 (*closefunc)(fout); 1782 return; 1783 err: 1784 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1785 return; 1786 } 1787 1788 static FILE * 1789 getdatasock(mode) 1790 char *mode; 1791 { 1792 int on = 1, s, t, tries; 1793 1794 if (data >= 0) 1795 return (fdopen(data, mode)); 1796 1797 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1798 if (s < 0) 1799 goto bad; 1800 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1801 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1802 /* anchor socket to avoid multi-homing problems */ 1803 data_source = ctrl_addr; 1804 data_source.su_port = htons(dataport); 1805 (void) seteuid((uid_t)0); 1806 for (tries = 1; ; tries++) { 1807 if (bind(s, (struct sockaddr *)&data_source, 1808 data_source.su_len) >= 0) 1809 break; 1810 if (errno != EADDRINUSE || tries > 10) 1811 goto bad; 1812 sleep(tries); 1813 } 1814 (void) seteuid((uid_t)pw->pw_uid); 1815 #ifdef IP_TOS 1816 if (data_source.su_family == AF_INET) 1817 { 1818 on = IPTOS_THROUGHPUT; 1819 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1820 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1821 } 1822 #endif 1823 #ifdef TCP_NOPUSH 1824 /* 1825 * Turn off push flag to keep sender TCP from sending short packets 1826 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1827 * to set the send buffer size as well, but that may not be desirable 1828 * in heavy-load situations. 1829 */ 1830 on = 1; 1831 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1832 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1833 #endif 1834 #ifdef SO_SNDBUF 1835 on = 65536; 1836 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1837 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1838 #endif 1839 1840 return (fdopen(s, mode)); 1841 bad: 1842 /* Return the real value of errno (close may change it) */ 1843 t = errno; 1844 (void) seteuid((uid_t)pw->pw_uid); 1845 (void) close(s); 1846 errno = t; 1847 return (NULL); 1848 } 1849 1850 static FILE * 1851 dataconn(name, size, mode) 1852 char *name; 1853 off_t size; 1854 char *mode; 1855 { 1856 char sizebuf[32]; 1857 FILE *file; 1858 int retry = 0, tos, conerrno; 1859 1860 file_size = size; 1861 byte_count = 0; 1862 if (size != (off_t) -1) 1863 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size); 1864 else 1865 *sizebuf = '\0'; 1866 if (pdata >= 0) { 1867 union sockunion from; 1868 int flags; 1869 int s, fromlen = ctrl_addr.su_len; 1870 struct timeval timeout; 1871 fd_set set; 1872 1873 FD_ZERO(&set); 1874 FD_SET(pdata, &set); 1875 1876 timeout.tv_usec = 0; 1877 timeout.tv_sec = 120; 1878 1879 /* 1880 * Granted a socket is in the blocking I/O mode, 1881 * accept() will block after a successful select() 1882 * if the selected connection dies in between. 1883 * Therefore set the non-blocking I/O flag here. 1884 */ 1885 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1886 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1887 goto pdata_err; 1888 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) <= 0 || 1889 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1890 goto pdata_err; 1891 (void) close(pdata); 1892 pdata = s; 1893 /* 1894 * Unset the inherited non-blocking I/O flag 1895 * on the child socket so stdio can work on it. 1896 */ 1897 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1898 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1899 goto pdata_err; 1900 #ifdef IP_TOS 1901 if (from.su_family == AF_INET) 1902 { 1903 tos = IPTOS_THROUGHPUT; 1904 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1905 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1906 } 1907 #endif 1908 reply(150, "Opening %s mode data connection for '%s'%s.", 1909 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1910 return (fdopen(pdata, mode)); 1911 pdata_err: 1912 reply(425, "Can't open data connection."); 1913 (void) close(pdata); 1914 pdata = -1; 1915 return (NULL); 1916 } 1917 if (data >= 0) { 1918 reply(125, "Using existing data connection for '%s'%s.", 1919 name, sizebuf); 1920 usedefault = 1; 1921 return (fdopen(data, mode)); 1922 } 1923 if (usedefault) 1924 data_dest = his_addr; 1925 usedefault = 1; 1926 do { 1927 file = getdatasock(mode); 1928 if (file == NULL) { 1929 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1930 getnameinfo((struct sockaddr *)&data_source, 1931 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1932 portbuf, sizeof(portbuf), 1933 NI_NUMERICHOST|NI_NUMERICSERV); 1934 reply(425, "Can't create data socket (%s,%s): %s.", 1935 hostbuf, portbuf, strerror(errno)); 1936 return (NULL); 1937 } 1938 data = fileno(file); 1939 conerrno = 0; 1940 if (connect(data, (struct sockaddr *)&data_dest, 1941 data_dest.su_len) == 0) 1942 break; 1943 conerrno = errno; 1944 (void) fclose(file); 1945 data = -1; 1946 if (conerrno == EADDRINUSE) { 1947 sleep((unsigned) swaitint); 1948 retry += swaitint; 1949 } else { 1950 break; 1951 } 1952 } while (retry <= swaitmax); 1953 if (conerrno != 0) { 1954 perror_reply(425, "Can't build data connection"); 1955 return (NULL); 1956 } 1957 reply(150, "Opening %s mode data connection for '%s'%s.", 1958 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1959 return (file); 1960 } 1961 1962 /* 1963 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1964 * encapsulation of the data subject to Mode, Structure, and Type. 1965 * 1966 * NB: Form isn't handled. 1967 */ 1968 static int 1969 send_data(instr, outstr, blksize, filesize, isreg) 1970 FILE *instr, *outstr; 1971 off_t blksize; 1972 off_t filesize; 1973 int isreg; 1974 { 1975 int c, filefd, netfd; 1976 char *buf; 1977 off_t cnt; 1978 1979 transflag++; 1980 switch (type) { 1981 1982 case TYPE_A: 1983 while ((c = getc(instr)) != EOF) { 1984 if (recvurg) 1985 goto got_oob; 1986 byte_count++; 1987 if (c == '\n') { 1988 if (ferror(outstr)) 1989 goto data_err; 1990 (void) putc('\r', outstr); 1991 } 1992 (void) putc(c, outstr); 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(instr, outstr) 2097 FILE *instr, *outstr; 2098 { 2099 int c; 2100 int cnt, bare_lfs; 2101 char buf[BUFSIZ]; 2102 2103 transflag++; 2104 bare_lfs = 0; 2105 2106 switch (type) { 2107 2108 case TYPE_I: 2109 case TYPE_L: 2110 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 2111 if (recvurg) 2112 goto got_oob; 2113 if (write(fileno(outstr), buf, cnt) != cnt) 2114 goto file_err; 2115 byte_count += cnt; 2116 } 2117 if (recvurg) 2118 goto got_oob; 2119 if (cnt < 0) 2120 goto data_err; 2121 transflag = 0; 2122 return (0); 2123 2124 case TYPE_E: 2125 reply(553, "TYPE E not implemented."); 2126 transflag = 0; 2127 return (-1); 2128 2129 case TYPE_A: 2130 while ((c = getc(instr)) != EOF) { 2131 if (recvurg) 2132 goto got_oob; 2133 byte_count++; 2134 if (c == '\n') 2135 bare_lfs++; 2136 while (c == '\r') { 2137 if (ferror(outstr)) 2138 goto data_err; 2139 if ((c = getc(instr)) != '\n') { 2140 (void) putc ('\r', outstr); 2141 if (c == '\0' || c == EOF) 2142 goto contin2; 2143 } 2144 } 2145 (void) putc(c, outstr); 2146 contin2: ; 2147 } 2148 if (recvurg) 2149 goto got_oob; 2150 fflush(outstr); 2151 if (ferror(instr)) 2152 goto data_err; 2153 if (ferror(outstr)) 2154 goto file_err; 2155 transflag = 0; 2156 if (bare_lfs) { 2157 lreply(226, 2158 "WARNING! %d bare linefeeds received in ASCII mode", 2159 bare_lfs); 2160 (void)printf(" File may not have transferred correctly.\r\n"); 2161 } 2162 return (0); 2163 default: 2164 reply(550, "Unimplemented TYPE %d in receive_data", type); 2165 transflag = 0; 2166 return (-1); 2167 } 2168 2169 data_err: 2170 transflag = 0; 2171 perror_reply(426, "Data Connection"); 2172 return (-1); 2173 2174 file_err: 2175 transflag = 0; 2176 perror_reply(452, "Error writing file"); 2177 return (-1); 2178 2179 got_oob: 2180 myoob(); 2181 recvurg = 0; 2182 transflag = 0; 2183 return (-1); 2184 } 2185 2186 void 2187 statfilecmd(filename) 2188 char *filename; 2189 { 2190 FILE *fin; 2191 int atstart; 2192 int c; 2193 char line[LINE_MAX]; 2194 2195 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2196 fin = ftpd_popen(line, "r"); 2197 lreply(211, "status of %s:", filename); 2198 atstart = 1; 2199 while ((c = getc(fin)) != EOF) { 2200 if (c == '\n') { 2201 if (ferror(stdout)){ 2202 perror_reply(421, "control connection"); 2203 (void) ftpd_pclose(fin); 2204 dologout(1); 2205 /* NOTREACHED */ 2206 } 2207 if (ferror(fin)) { 2208 perror_reply(551, filename); 2209 (void) ftpd_pclose(fin); 2210 return; 2211 } 2212 (void) putc('\r', stdout); 2213 } 2214 /* 2215 * RFC 959 says neutral text should be prepended before 2216 * a leading 3-digit number followed by whitespace, but 2217 * many ftp clients can be confused by any leading digits, 2218 * as a matter of fact. 2219 */ 2220 if (atstart && isdigit(c)) 2221 (void) putc(' ', stdout); 2222 (void) putc(c, stdout); 2223 atstart = (c == '\n'); 2224 } 2225 (void) ftpd_pclose(fin); 2226 reply(211, "End of Status"); 2227 } 2228 2229 void 2230 statcmd() 2231 { 2232 union sockunion *su; 2233 u_char *a, *p; 2234 char hname[NI_MAXHOST]; 2235 int ispassive; 2236 2237 if (hostinfo) { 2238 lreply(211, "%s FTP server status:", hostname); 2239 printf(" %s\r\n", version); 2240 } else 2241 lreply(211, "FTP server status:"); 2242 printf(" Connected to %s", remotehost); 2243 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2244 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2245 if (strcmp(hname, remotehost) != 0) 2246 printf(" (%s)", hname); 2247 } 2248 printf("\r\n"); 2249 if (logged_in) { 2250 if (guest) 2251 printf(" Logged in anonymously\r\n"); 2252 else 2253 printf(" Logged in as %s\r\n", pw->pw_name); 2254 } else if (askpasswd) 2255 printf(" Waiting for password\r\n"); 2256 else 2257 printf(" Waiting for user name\r\n"); 2258 printf(" TYPE: %s", typenames[type]); 2259 if (type == TYPE_A || type == TYPE_E) 2260 printf(", FORM: %s", formnames[form]); 2261 if (type == TYPE_L) 2262 #if NBBY == 8 2263 printf(" %d", NBBY); 2264 #else 2265 printf(" %d", bytesize); /* need definition! */ 2266 #endif 2267 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2268 strunames[stru], modenames[mode]); 2269 if (data != -1) 2270 printf(" Data connection open\r\n"); 2271 else if (pdata != -1) { 2272 ispassive = 1; 2273 su = &pasv_addr; 2274 goto printaddr; 2275 } else if (usedefault == 0) { 2276 ispassive = 0; 2277 su = &data_dest; 2278 printaddr: 2279 #define UC(b) (((int) b) & 0xff) 2280 if (epsvall) { 2281 printf(" EPSV only mode (EPSV ALL)\r\n"); 2282 goto epsvonly; 2283 } 2284 2285 /* PORT/PASV */ 2286 if (su->su_family == AF_INET) { 2287 a = (u_char *) &su->su_sin.sin_addr; 2288 p = (u_char *) &su->su_sin.sin_port; 2289 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2290 ispassive ? "PASV" : "PORT", 2291 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2292 UC(p[0]), UC(p[1])); 2293 } 2294 2295 /* LPRT/LPSV */ 2296 { 2297 int alen, af, i; 2298 2299 switch (su->su_family) { 2300 case AF_INET: 2301 a = (u_char *) &su->su_sin.sin_addr; 2302 p = (u_char *) &su->su_sin.sin_port; 2303 alen = sizeof(su->su_sin.sin_addr); 2304 af = 4; 2305 break; 2306 case AF_INET6: 2307 a = (u_char *) &su->su_sin6.sin6_addr; 2308 p = (u_char *) &su->su_sin6.sin6_port; 2309 alen = sizeof(su->su_sin6.sin6_addr); 2310 af = 6; 2311 break; 2312 default: 2313 af = 0; 2314 break; 2315 } 2316 if (af) { 2317 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2318 af, alen); 2319 for (i = 0; i < alen; i++) 2320 printf("%d,", UC(a[i])); 2321 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2322 } 2323 } 2324 2325 epsvonly:; 2326 /* EPRT/EPSV */ 2327 { 2328 int af; 2329 2330 switch (su->su_family) { 2331 case AF_INET: 2332 af = 1; 2333 break; 2334 case AF_INET6: 2335 af = 2; 2336 break; 2337 default: 2338 af = 0; 2339 break; 2340 } 2341 if (af) { 2342 union sockunion tmp; 2343 2344 tmp = *su; 2345 if (tmp.su_family == AF_INET6) 2346 tmp.su_sin6.sin6_scope_id = 0; 2347 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2348 hname, sizeof(hname) - 1, NULL, 0, 2349 NI_NUMERICHOST)) { 2350 printf(" %s |%d|%s|%d|\r\n", 2351 ispassive ? "EPSV" : "EPRT", 2352 af, hname, htons(tmp.su_port)); 2353 } 2354 } 2355 } 2356 #undef UC 2357 } else 2358 printf(" No data connection\r\n"); 2359 reply(211, "End of status"); 2360 } 2361 2362 void 2363 fatalerror(s) 2364 char *s; 2365 { 2366 2367 reply(451, "Error in server: %s\n", s); 2368 reply(221, "Closing connection due to server error."); 2369 dologout(0); 2370 /* NOTREACHED */ 2371 } 2372 2373 void 2374 #if __STDC__ 2375 reply(int n, const char *fmt, ...) 2376 #else 2377 reply(n, fmt, va_alist) 2378 int n; 2379 char *fmt; 2380 va_dcl 2381 #endif 2382 { 2383 va_list ap; 2384 #if __STDC__ 2385 va_start(ap, fmt); 2386 #else 2387 va_start(ap); 2388 #endif 2389 (void)printf("%d ", n); 2390 (void)vprintf(fmt, ap); 2391 (void)printf("\r\n"); 2392 (void)fflush(stdout); 2393 if (ftpdebug) { 2394 syslog(LOG_DEBUG, "<--- %d ", n); 2395 vsyslog(LOG_DEBUG, fmt, ap); 2396 } 2397 } 2398 2399 void 2400 #if __STDC__ 2401 lreply(int n, const char *fmt, ...) 2402 #else 2403 lreply(n, fmt, va_alist) 2404 int n; 2405 char *fmt; 2406 va_dcl 2407 #endif 2408 { 2409 va_list ap; 2410 #if __STDC__ 2411 va_start(ap, fmt); 2412 #else 2413 va_start(ap); 2414 #endif 2415 (void)printf("%d- ", n); 2416 (void)vprintf(fmt, ap); 2417 (void)printf("\r\n"); 2418 (void)fflush(stdout); 2419 if (ftpdebug) { 2420 syslog(LOG_DEBUG, "<--- %d- ", n); 2421 vsyslog(LOG_DEBUG, fmt, ap); 2422 } 2423 } 2424 2425 static void 2426 ack(s) 2427 char *s; 2428 { 2429 2430 reply(250, "%s command successful.", s); 2431 } 2432 2433 void 2434 nack(s) 2435 char *s; 2436 { 2437 2438 reply(502, "%s command not implemented.", s); 2439 } 2440 2441 /* ARGSUSED */ 2442 void 2443 yyerror(s) 2444 char *s; 2445 { 2446 char *cp; 2447 2448 if ((cp = strchr(cbuf,'\n'))) 2449 *cp = '\0'; 2450 reply(500, "'%s': command not understood.", cbuf); 2451 } 2452 2453 void 2454 delete(name) 2455 char *name; 2456 { 2457 struct stat st; 2458 2459 LOGCMD("delete", name); 2460 if (lstat(name, &st) < 0) { 2461 perror_reply(550, name); 2462 return; 2463 } 2464 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2465 if (rmdir(name) < 0) { 2466 perror_reply(550, name); 2467 return; 2468 } 2469 goto done; 2470 } 2471 if (unlink(name) < 0) { 2472 perror_reply(550, name); 2473 return; 2474 } 2475 done: 2476 ack("DELE"); 2477 } 2478 2479 void 2480 cwd(path) 2481 char *path; 2482 { 2483 2484 if (chdir(path) < 0) 2485 perror_reply(550, path); 2486 else 2487 ack("CWD"); 2488 } 2489 2490 void 2491 makedir(name) 2492 char *name; 2493 { 2494 char *s; 2495 2496 LOGCMD("mkdir", name); 2497 if (guest && noguestmkd) 2498 reply(550, "%s: permission denied", name); 2499 else if (mkdir(name, 0777) < 0) 2500 perror_reply(550, name); 2501 else { 2502 if ((s = doublequote(name)) == NULL) 2503 fatalerror("Ran out of memory."); 2504 reply(257, "\"%s\" directory created.", s); 2505 free(s); 2506 } 2507 } 2508 2509 void 2510 removedir(name) 2511 char *name; 2512 { 2513 2514 LOGCMD("rmdir", name); 2515 if (rmdir(name) < 0) 2516 perror_reply(550, name); 2517 else 2518 ack("RMD"); 2519 } 2520 2521 void 2522 pwd() 2523 { 2524 char *s, path[MAXPATHLEN + 1]; 2525 2526 if (getwd(path) == (char *)NULL) 2527 reply(550, "%s.", path); 2528 else { 2529 if ((s = doublequote(path)) == NULL) 2530 fatalerror("Ran out of memory."); 2531 reply(257, "\"%s\" is current directory.", s); 2532 free(s); 2533 } 2534 } 2535 2536 char * 2537 renamefrom(name) 2538 char *name; 2539 { 2540 struct stat st; 2541 2542 if (lstat(name, &st) < 0) { 2543 perror_reply(550, name); 2544 return ((char *)0); 2545 } 2546 reply(350, "File exists, ready for destination name"); 2547 return (name); 2548 } 2549 2550 void 2551 renamecmd(from, to) 2552 char *from, *to; 2553 { 2554 struct stat st; 2555 2556 LOGCMD2("rename", from, to); 2557 2558 if (guest && (stat(to, &st) == 0)) { 2559 reply(550, "%s: permission denied", to); 2560 return; 2561 } 2562 2563 if (rename(from, to) < 0) 2564 perror_reply(550, "rename"); 2565 else 2566 ack("RNTO"); 2567 } 2568 2569 static void 2570 dolog(who) 2571 struct sockaddr *who; 2572 { 2573 int error; 2574 2575 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2576 2577 #ifdef SETPROCTITLE 2578 #ifdef VIRTUAL_HOSTING 2579 if (thishost != firsthost) 2580 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2581 remotehost, hostname); 2582 else 2583 #endif 2584 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2585 remotehost); 2586 setproctitle("%s", proctitle); 2587 #endif /* SETPROCTITLE */ 2588 2589 if (logging) { 2590 #ifdef VIRTUAL_HOSTING 2591 if (thishost != firsthost) 2592 syslog(LOG_INFO, "connection from %s (to %s)", 2593 remotehost, hostname); 2594 else 2595 #endif 2596 { 2597 char who_name[MAXHOSTNAMELEN]; 2598 2599 error = getnameinfo(who, who->sa_len, 2600 who_name, sizeof(who_name) - 1, 2601 NULL, 0, NI_NUMERICHOST); 2602 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2603 error == 0 ? who_name : ""); 2604 } 2605 } 2606 } 2607 2608 /* 2609 * Record logout in wtmp file 2610 * and exit with supplied status. 2611 */ 2612 void 2613 dologout(status) 2614 int status; 2615 { 2616 /* 2617 * Prevent reception of SIGURG from resulting in a resumption 2618 * back to the main program loop. 2619 */ 2620 transflag = 0; 2621 2622 if (logged_in && dowtmp) { 2623 (void) seteuid((uid_t)0); 2624 ftpd_logwtmp(ttyline, "", NULL); 2625 } 2626 /* beware of flushing buffers after a SIGPIPE */ 2627 _exit(status); 2628 } 2629 2630 static void 2631 sigurg(signo) 2632 int signo; 2633 { 2634 2635 recvurg = 1; 2636 } 2637 2638 static void 2639 myoob() 2640 { 2641 char *cp; 2642 2643 /* only process if transfer occurring */ 2644 if (!transflag) 2645 return; 2646 cp = tmpline; 2647 if (getline(cp, 7, stdin) == NULL) { 2648 reply(221, "You could at least say goodbye."); 2649 dologout(0); 2650 } 2651 upper(cp); 2652 if (strcmp(cp, "ABOR\r\n") == 0) { 2653 tmpline[0] = '\0'; 2654 reply(426, "Transfer aborted. Data connection closed."); 2655 reply(226, "Abort successful"); 2656 } 2657 if (strcmp(cp, "STAT\r\n") == 0) { 2658 tmpline[0] = '\0'; 2659 if (file_size != (off_t) -1) 2660 reply(213, "Status: %qd of %qd bytes transferred", 2661 byte_count, file_size); 2662 else 2663 reply(213, "Status: %qd bytes transferred", byte_count); 2664 } 2665 } 2666 2667 /* 2668 * Note: a response of 425 is not mentioned as a possible response to 2669 * the PASV command in RFC959. However, it has been blessed as 2670 * a legitimate response by Jon Postel in a telephone conversation 2671 * with Rick Adams on 25 Jan 89. 2672 */ 2673 void 2674 passive() 2675 { 2676 int len, on; 2677 char *p, *a; 2678 2679 if (pdata >= 0) /* close old port if one set */ 2680 close(pdata); 2681 2682 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2683 if (pdata < 0) { 2684 perror_reply(425, "Can't open passive connection"); 2685 return; 2686 } 2687 on = 1; 2688 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2689 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2690 2691 (void) seteuid((uid_t)0); 2692 2693 #ifdef IP_PORTRANGE 2694 if (ctrl_addr.su_family == AF_INET) { 2695 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2696 : IP_PORTRANGE_DEFAULT; 2697 2698 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2699 &on, sizeof(on)) < 0) 2700 goto pasv_error; 2701 } 2702 #endif 2703 #ifdef IPV6_PORTRANGE 2704 if (ctrl_addr.su_family == AF_INET6) { 2705 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2706 : IPV6_PORTRANGE_DEFAULT; 2707 2708 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2709 &on, sizeof(on)) < 0) 2710 goto pasv_error; 2711 } 2712 #endif 2713 2714 pasv_addr = ctrl_addr; 2715 pasv_addr.su_port = 0; 2716 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2717 goto pasv_error; 2718 2719 (void) seteuid((uid_t)pw->pw_uid); 2720 2721 len = sizeof(pasv_addr); 2722 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2723 goto pasv_error; 2724 if (listen(pdata, 1) < 0) 2725 goto pasv_error; 2726 if (pasv_addr.su_family == AF_INET) 2727 a = (char *) &pasv_addr.su_sin.sin_addr; 2728 else if (pasv_addr.su_family == AF_INET6 && 2729 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2730 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2731 else 2732 goto pasv_error; 2733 2734 p = (char *) &pasv_addr.su_port; 2735 2736 #define UC(b) (((int) b) & 0xff) 2737 2738 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2739 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2740 return; 2741 2742 pasv_error: 2743 (void) seteuid((uid_t)pw->pw_uid); 2744 (void) close(pdata); 2745 pdata = -1; 2746 perror_reply(425, "Can't open passive connection"); 2747 return; 2748 } 2749 2750 /* 2751 * Long Passive defined in RFC 1639. 2752 * 228 Entering Long Passive Mode 2753 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2754 */ 2755 2756 void 2757 long_passive(cmd, pf) 2758 char *cmd; 2759 int pf; 2760 { 2761 int len, on; 2762 char *p, *a; 2763 2764 if (pdata >= 0) /* close old port if one set */ 2765 close(pdata); 2766 2767 if (pf != PF_UNSPEC) { 2768 if (ctrl_addr.su_family != pf) { 2769 switch (ctrl_addr.su_family) { 2770 case AF_INET: 2771 pf = 1; 2772 break; 2773 case AF_INET6: 2774 pf = 2; 2775 break; 2776 default: 2777 pf = 0; 2778 break; 2779 } 2780 /* 2781 * XXX 2782 * only EPRT/EPSV ready clients will understand this 2783 */ 2784 if (strcmp(cmd, "EPSV") == 0 && pf) { 2785 reply(522, "Network protocol mismatch, " 2786 "use (%d)", pf); 2787 } else 2788 reply(501, "Network protocol mismatch"); /*XXX*/ 2789 2790 return; 2791 } 2792 } 2793 2794 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2795 if (pdata < 0) { 2796 perror_reply(425, "Can't open passive connection"); 2797 return; 2798 } 2799 on = 1; 2800 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2801 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2802 2803 (void) seteuid((uid_t)0); 2804 2805 pasv_addr = ctrl_addr; 2806 pasv_addr.su_port = 0; 2807 len = pasv_addr.su_len; 2808 2809 #ifdef IP_PORTRANGE 2810 if (ctrl_addr.su_family == AF_INET) { 2811 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2812 : IP_PORTRANGE_DEFAULT; 2813 2814 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2815 &on, sizeof(on)) < 0) 2816 goto pasv_error; 2817 } 2818 #endif 2819 #ifdef IPV6_PORTRANGE 2820 if (ctrl_addr.su_family == AF_INET6) { 2821 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2822 : IPV6_PORTRANGE_DEFAULT; 2823 2824 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2825 &on, sizeof(on)) < 0) 2826 goto pasv_error; 2827 } 2828 #endif 2829 2830 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2831 goto pasv_error; 2832 2833 (void) seteuid((uid_t)pw->pw_uid); 2834 2835 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2836 goto pasv_error; 2837 if (listen(pdata, 1) < 0) 2838 goto pasv_error; 2839 2840 #define UC(b) (((int) b) & 0xff) 2841 2842 if (strcmp(cmd, "LPSV") == 0) { 2843 p = (char *)&pasv_addr.su_port; 2844 switch (pasv_addr.su_family) { 2845 case AF_INET: 2846 a = (char *) &pasv_addr.su_sin.sin_addr; 2847 v4_reply: 2848 reply(228, 2849 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2850 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2851 2, UC(p[0]), UC(p[1])); 2852 return; 2853 case AF_INET6: 2854 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2855 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2856 goto v4_reply; 2857 } 2858 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2859 reply(228, 2860 "Entering Long Passive Mode " 2861 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2862 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2863 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2864 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2865 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2866 2, UC(p[0]), UC(p[1])); 2867 return; 2868 } 2869 } else if (strcmp(cmd, "EPSV") == 0) { 2870 switch (pasv_addr.su_family) { 2871 case AF_INET: 2872 case AF_INET6: 2873 reply(229, "Entering Extended Passive Mode (|||%d|)", 2874 ntohs(pasv_addr.su_port)); 2875 return; 2876 } 2877 } else { 2878 /* more proper error code? */ 2879 } 2880 2881 pasv_error: 2882 (void) seteuid((uid_t)pw->pw_uid); 2883 (void) close(pdata); 2884 pdata = -1; 2885 perror_reply(425, "Can't open passive connection"); 2886 return; 2887 } 2888 2889 /* 2890 * Generate unique name for file with basename "local" 2891 * and open the file in order to avoid possible races. 2892 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2893 * Return descriptor to the file, set "name" to its name. 2894 * 2895 * Generates failure reply on error. 2896 */ 2897 static int 2898 guniquefd(local, name) 2899 char *local; 2900 char **name; 2901 { 2902 static char new[MAXPATHLEN]; 2903 struct stat st; 2904 char *cp; 2905 int count; 2906 int fd; 2907 2908 cp = strrchr(local, '/'); 2909 if (cp) 2910 *cp = '\0'; 2911 if (stat(cp ? local : ".", &st) < 0) { 2912 perror_reply(553, cp ? local : "."); 2913 return (-1); 2914 } 2915 if (cp) { 2916 /* 2917 * Let not overwrite dirname with counter suffix. 2918 * -4 is for /nn\0 2919 * In this extreme case dot won't be put in front of suffix. 2920 */ 2921 if (strlen(local) > sizeof(new) - 4) { 2922 reply(553, "Pathname too long"); 2923 return (-1); 2924 } 2925 *cp = '/'; 2926 } 2927 /* -4 is for the .nn<null> we put on the end below */ 2928 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2929 cp = new + strlen(new); 2930 /* 2931 * Don't generate dotfile unless requested explicitly. 2932 * This covers the case when basename gets truncated off 2933 * by buffer size. 2934 */ 2935 if (cp > new && cp[-1] != '/') 2936 *cp++ = '.'; 2937 for (count = 0; count < 100; count++) { 2938 /* At count 0 try unmodified name */ 2939 if (count) 2940 (void)sprintf(cp, "%d", count); 2941 if ((fd = open(count ? new : local, 2942 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2943 *name = count ? new : local; 2944 return (fd); 2945 } 2946 if (errno != EEXIST) { 2947 perror_reply(553, count ? new : local); 2948 return (-1); 2949 } 2950 } 2951 reply(452, "Unique file name cannot be created."); 2952 return (-1); 2953 } 2954 2955 /* 2956 * Format and send reply containing system error number. 2957 */ 2958 void 2959 perror_reply(code, string) 2960 int code; 2961 char *string; 2962 { 2963 2964 reply(code, "%s: %s.", string, strerror(errno)); 2965 } 2966 2967 static char *onefile[] = { 2968 "", 2969 0 2970 }; 2971 2972 void 2973 send_file_list(whichf) 2974 char *whichf; 2975 { 2976 struct stat st; 2977 DIR *dirp = NULL; 2978 struct dirent *dir; 2979 FILE *dout = NULL; 2980 char **dirlist, *dirname; 2981 int simple = 0; 2982 int freeglob = 0; 2983 glob_t gl; 2984 2985 if (strpbrk(whichf, "~{[*?") != NULL) { 2986 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 2987 2988 memset(&gl, 0, sizeof(gl)); 2989 gl.gl_matchc = MAXGLOBARGS; 2990 flags |= GLOB_LIMIT; 2991 freeglob = 1; 2992 if (glob(whichf, flags, 0, &gl)) { 2993 reply(550, "not found"); 2994 goto out; 2995 } else if (gl.gl_pathc == 0) { 2996 errno = ENOENT; 2997 perror_reply(550, whichf); 2998 goto out; 2999 } 3000 dirlist = gl.gl_pathv; 3001 } else { 3002 onefile[0] = whichf; 3003 dirlist = onefile; 3004 simple = 1; 3005 } 3006 3007 while ((dirname = *dirlist++)) { 3008 if (stat(dirname, &st) < 0) { 3009 /* 3010 * If user typed "ls -l", etc, and the client 3011 * used NLST, do what the user meant. 3012 */ 3013 if (dirname[0] == '-' && *dirlist == NULL && 3014 transflag == 0) { 3015 retrieve(_PATH_LS " %s", dirname); 3016 goto out; 3017 } 3018 perror_reply(550, whichf); 3019 if (dout != NULL) { 3020 (void) fclose(dout); 3021 transflag = 0; 3022 data = -1; 3023 pdata = -1; 3024 } 3025 goto out; 3026 } 3027 3028 if (S_ISREG(st.st_mode)) { 3029 if (dout == NULL) { 3030 dout = dataconn("file list", (off_t)-1, "w"); 3031 if (dout == NULL) 3032 goto out; 3033 transflag++; 3034 } 3035 fprintf(dout, "%s%s\n", dirname, 3036 type == TYPE_A ? "\r" : ""); 3037 byte_count += strlen(dirname) + 1; 3038 continue; 3039 } else if (!S_ISDIR(st.st_mode)) 3040 continue; 3041 3042 if ((dirp = opendir(dirname)) == NULL) 3043 continue; 3044 3045 while ((dir = readdir(dirp)) != NULL) { 3046 char nbuf[MAXPATHLEN]; 3047 3048 if (recvurg) { 3049 myoob(); 3050 recvurg = 0; 3051 transflag = 0; 3052 goto out; 3053 } 3054 3055 if (strcmp(dir->d_name, ".") == 0) 3056 continue; 3057 if (strcmp(dir->d_name, "..") == 0) 3058 continue; 3059 3060 snprintf(nbuf, sizeof(nbuf), 3061 "%s/%s", dirname, dir->d_name); 3062 3063 /* 3064 * We have to do a stat to insure it's 3065 * not a directory or special file. 3066 */ 3067 if (simple || (stat(nbuf, &st) == 0 && 3068 S_ISREG(st.st_mode))) { 3069 if (dout == NULL) { 3070 dout = dataconn("file list", (off_t)-1, 3071 "w"); 3072 if (dout == NULL) 3073 goto out; 3074 transflag++; 3075 } 3076 if (nbuf[0] == '.' && nbuf[1] == '/') 3077 fprintf(dout, "%s%s\n", &nbuf[2], 3078 type == TYPE_A ? "\r" : ""); 3079 else 3080 fprintf(dout, "%s%s\n", nbuf, 3081 type == TYPE_A ? "\r" : ""); 3082 byte_count += strlen(nbuf) + 1; 3083 } 3084 } 3085 (void) closedir(dirp); 3086 } 3087 3088 if (dout == NULL) 3089 reply(550, "No files found."); 3090 else if (ferror(dout) != 0) 3091 perror_reply(550, "Data connection"); 3092 else 3093 reply(226, "Transfer complete."); 3094 3095 transflag = 0; 3096 if (dout != NULL) 3097 (void) fclose(dout); 3098 data = -1; 3099 pdata = -1; 3100 out: 3101 if (freeglob) { 3102 freeglob = 0; 3103 globfree(&gl); 3104 } 3105 } 3106 3107 void 3108 reapchild(signo) 3109 int signo; 3110 { 3111 while (wait3(NULL, WNOHANG, NULL) > 0); 3112 } 3113 3114 #ifdef OLD_SETPROCTITLE 3115 /* 3116 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3117 * Warning, since this is usually started from inetd.conf, it often doesn't 3118 * have much of an environment or arglist to overwrite. 3119 */ 3120 void 3121 #if __STDC__ 3122 setproctitle(const char *fmt, ...) 3123 #else 3124 setproctitle(fmt, va_alist) 3125 char *fmt; 3126 va_dcl 3127 #endif 3128 { 3129 int i; 3130 va_list ap; 3131 char *p, *bp, ch; 3132 char buf[LINE_MAX]; 3133 3134 #if __STDC__ 3135 va_start(ap, fmt); 3136 #else 3137 va_start(ap); 3138 #endif 3139 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3140 3141 /* make ps print our process name */ 3142 p = Argv[0]; 3143 *p++ = '-'; 3144 3145 i = strlen(buf); 3146 if (i > LastArgv - p - 2) { 3147 i = LastArgv - p - 2; 3148 buf[i] = '\0'; 3149 } 3150 bp = buf; 3151 while (ch = *bp++) 3152 if (ch != '\n' && ch != '\r') 3153 *p++ = ch; 3154 while (p < LastArgv) 3155 *p++ = ' '; 3156 } 3157 #endif /* OLD_SETPROCTITLE */ 3158 3159 static void 3160 logxfer(name, size, start) 3161 char *name; 3162 off_t size; 3163 time_t start; 3164 { 3165 char buf[1024]; 3166 char path[MAXPATHLEN + 1]; 3167 time_t now; 3168 3169 if (statfd >= 0 && getwd(path) != NULL) { 3170 time(&now); 3171 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n", 3172 ctime(&now)+4, ident, remotehost, 3173 path, name, (long long)size, 3174 (long)(now - start + (now == start))); 3175 write(statfd, buf, strlen(buf)); 3176 } 3177 } 3178 3179 static char * 3180 doublequote(s) 3181 char *s; 3182 { 3183 int n; 3184 char *p, *s2; 3185 3186 for (p = s, n = 0; *p; p++) 3187 if (*p == '"') 3188 n++; 3189 3190 if ((s2 = malloc(p - s + n + 1)) == NULL) 3191 return (NULL); 3192 3193 for (p = s2; *s; s++, p++) { 3194 if ((*p = *s) == '"') 3195 *(++p) = '"'; 3196 } 3197 *p = '\0'; 3198 3199 return (s2); 3200 } 3201