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 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 #ifdef USE_PAM 182 static int auth_pam(struct passwd**, const char*); 183 pam_handle_t *pamh = NULL; 184 #endif 185 186 static struct opie opiedata; 187 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 188 static int pwok; 189 190 char *pid_file = NULL; 191 192 /* 193 * Limit number of pathnames that glob can return. 194 * A limit of 0 indicates the number of pathnames is unlimited. 195 */ 196 #define MAXGLOBARGS 16384 197 # 198 199 /* 200 * Timeout intervals for retrying connections 201 * to hosts that don't accept PORT cmds. This 202 * is a kludge, but given the problems with TCP... 203 */ 204 #define SWAITMAX 90 /* wait at most 90 seconds */ 205 #define SWAITINT 5 /* interval between retries */ 206 207 int swaitmax = SWAITMAX; 208 int swaitint = SWAITINT; 209 210 #ifdef SETPROCTITLE 211 #ifdef OLD_SETPROCTITLE 212 char **Argv = NULL; /* pointer to argument vector */ 213 char *LastArgv = NULL; /* end of argv */ 214 #endif /* OLD_SETPROCTITLE */ 215 char proctitle[LINE_MAX]; /* initial part of title */ 216 #endif /* SETPROCTITLE */ 217 218 #define LOGCMD(cmd, file) \ 219 if (logging > 1) \ 220 syslog(LOG_INFO,"%s %s%s", cmd, \ 221 *(file) == '/' ? "" : curdir(), file); 222 #define LOGCMD2(cmd, file1, file2) \ 223 if (logging > 1) \ 224 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 225 *(file1) == '/' ? "" : curdir(), file1, \ 226 *(file2) == '/' ? "" : curdir(), file2); 227 #define LOGBYTES(cmd, file, cnt) \ 228 if (logging > 1) { \ 229 if (cnt == (off_t)-1) \ 230 syslog(LOG_INFO,"%s %s%s", cmd, \ 231 *(file) == '/' ? "" : curdir(), file); \ 232 else \ 233 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 234 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 235 } 236 237 #ifdef VIRTUAL_HOSTING 238 static void inithosts(void); 239 static void selecthost(union sockunion *); 240 #endif 241 static void ack(char *); 242 static void sigurg(int); 243 static void myoob(void); 244 static int checkuser(char *, char *, int, char **); 245 static FILE *dataconn(char *, off_t, char *); 246 static void dolog(struct sockaddr *); 247 static char *curdir(void); 248 static void end_login(void); 249 static FILE *getdatasock(char *); 250 static int guniquefd(char *, char **); 251 static void lostconn(int); 252 static void sigquit(int); 253 static int receive_data(FILE *, FILE *); 254 static int send_data(FILE *, FILE *, off_t, off_t, int); 255 static struct passwd * 256 sgetpwnam(char *); 257 static char *sgetsave(char *); 258 static void reapchild(int); 259 static void logxfer(char *, off_t, time_t); 260 static char *doublequote(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 int enable_v4 = 0; 286 struct sigaction sa; 287 288 tzset(); /* in case no timezone database in ~ftp */ 289 sigemptyset(&sa.sa_mask); 290 sa.sa_flags = SA_RESTART; 291 292 #ifdef OLD_SETPROCTITLE 293 /* 294 * Save start and extent of argv for setproctitle. 295 */ 296 Argv = argv; 297 while (*envp) 298 envp++; 299 LastArgv = envp[-1] + strlen(envp[-1]); 300 #endif /* OLD_SETPROCTITLE */ 301 302 303 while ((ch = getopt(argc, argv, 304 "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 305 switch (ch) { 306 case '4': 307 enable_v4 = 1; 308 if (family == AF_UNSPEC) 309 family = AF_INET; 310 break; 311 312 case '6': 313 family = AF_INET6; 314 break; 315 316 case 'a': 317 bindname = optarg; 318 break; 319 320 case 'A': 321 anon_only = 1; 322 break; 323 324 case 'd': 325 ftpdebug++; 326 break; 327 328 case 'D': 329 daemon_mode++; 330 break; 331 332 case 'E': 333 noepsv = 1; 334 break; 335 336 case 'h': 337 hostinfo = 0; 338 break; 339 340 case 'l': 341 logging++; /* > 1 == extra logging */ 342 break; 343 344 case 'm': 345 noguestmod = 0; 346 break; 347 348 case 'M': 349 noguestmkd = 1; 350 break; 351 352 case 'o': 353 noretr = 1; 354 break; 355 356 case 'O': 357 noguestretr = 1; 358 break; 359 360 case 'p': 361 pid_file = optarg; 362 break; 363 364 case 'P': 365 bindport = optarg; 366 break; 367 368 case 'r': 369 readonly = 1; 370 break; 371 372 case 'R': 373 paranoid = 0; 374 break; 375 376 case 'S': 377 stats++; 378 break; 379 380 case 't': 381 timeout = atoi(optarg); 382 if (maxtimeout < timeout) 383 maxtimeout = timeout; 384 break; 385 386 case 'T': 387 maxtimeout = atoi(optarg); 388 if (timeout > maxtimeout) 389 timeout = maxtimeout; 390 break; 391 392 case 'u': 393 { 394 long val = 0; 395 396 val = strtol(optarg, &optarg, 8); 397 if (*optarg != '\0' || val < 0) 398 warnx("bad value for -u"); 399 else 400 defumask = val; 401 break; 402 } 403 case 'U': 404 restricted_data_ports = 0; 405 break; 406 407 case 'v': 408 ftpdebug++; 409 break; 410 411 case 'W': 412 dowtmp = 0; 413 break; 414 415 default: 416 warnx("unknown flag -%c ignored", optopt); 417 break; 418 } 419 } 420 421 #ifdef VIRTUAL_HOSTING 422 inithosts(); 423 #endif 424 (void) freopen(_PATH_DEVNULL, "w", stderr); 425 426 /* 427 * LOG_NDELAY sets up the logging connection immediately, 428 * necessary for anonymous ftp's that chroot and can't do it later. 429 */ 430 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 431 432 if (daemon_mode) { 433 int ctl_sock, fd; 434 struct addrinfo hints, *res; 435 436 /* 437 * Detach from parent. 438 */ 439 if (daemon(1, 1) < 0) { 440 syslog(LOG_ERR, "failed to become a daemon"); 441 exit(1); 442 } 443 sa.sa_handler = reapchild; 444 (void)sigaction(SIGCHLD, &sa, NULL); 445 /* init bind_sa */ 446 memset(&hints, 0, sizeof(hints)); 447 448 hints.ai_family = family == AF_UNSPEC ? AF_INET : family; 449 hints.ai_socktype = SOCK_STREAM; 450 hints.ai_protocol = 0; 451 hints.ai_flags = AI_PASSIVE; 452 error = getaddrinfo(bindname, bindport, &hints, &res); 453 if (error) { 454 if (family == AF_UNSPEC) { 455 hints.ai_family = AF_UNSPEC; 456 error = getaddrinfo(bindname, bindport, &hints, 457 &res); 458 } 459 } 460 if (error) { 461 syslog(LOG_ERR, "%s", gai_strerror(error)); 462 if (error == EAI_SYSTEM) 463 syslog(LOG_ERR, "%s", strerror(errno)); 464 exit(1); 465 } 466 if (res->ai_addr == NULL) { 467 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 468 exit(1); 469 } else 470 family = res->ai_addr->sa_family; 471 /* 472 * Open a socket, bind it to the FTP port, and start 473 * listening. 474 */ 475 ctl_sock = socket(family, SOCK_STREAM, 0); 476 if (ctl_sock < 0) { 477 syslog(LOG_ERR, "control socket: %m"); 478 exit(1); 479 } 480 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 481 &on, sizeof(on)) < 0) 482 syslog(LOG_WARNING, 483 "control setsockopt (SO_REUSEADDR): %m"); 484 if (family == AF_INET6 && enable_v4 == 0) { 485 if (setsockopt(ctl_sock, IPPROTO_IPV6, IPV6_V6ONLY, 486 &on, sizeof (on)) < 0) 487 syslog(LOG_WARNING, 488 "control setsockopt (IPV6_V6ONLY): %m"); 489 } 490 memcpy(&server_addr, res->ai_addr, res->ai_addr->sa_len); 491 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 492 server_addr.su_len) < 0) { 493 syslog(LOG_ERR, "control bind: %m"); 494 exit(1); 495 } 496 if (listen(ctl_sock, 32) < 0) { 497 syslog(LOG_ERR, "control listen: %m"); 498 exit(1); 499 } 500 /* 501 * Atomically write process ID 502 */ 503 if (pid_file) 504 { 505 int fd; 506 char buf[20]; 507 508 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 509 | O_NONBLOCK | O_EXLOCK, 0644); 510 if (fd < 0) { 511 if (errno == EAGAIN) 512 errx(1, "%s: file locked", pid_file); 513 else 514 err(1, "%s", pid_file); 515 } 516 snprintf(buf, sizeof(buf), 517 "%lu\n", (unsigned long) getpid()); 518 if (write(fd, buf, strlen(buf)) < 0) 519 err(1, "%s: write", pid_file); 520 /* Leave the pid file open and locked */ 521 } 522 /* 523 * Loop forever accepting connection requests and forking off 524 * children to handle them. 525 */ 526 while (1) { 527 addrlen = server_addr.su_len; 528 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen); 529 if (fork() == 0) { 530 /* child */ 531 (void) dup2(fd, 0); 532 (void) dup2(fd, 1); 533 close(ctl_sock); 534 break; 535 } 536 close(fd); 537 } 538 } else { 539 addrlen = sizeof(his_addr); 540 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 541 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 542 exit(1); 543 } 544 } 545 546 sa.sa_handler = SIG_DFL; 547 (void)sigaction(SIGCHLD, &sa, NULL); 548 549 sa.sa_handler = sigurg; 550 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 551 (void)sigaction(SIGURG, &sa, NULL); 552 553 sigfillset(&sa.sa_mask); /* block all signals in handler */ 554 sa.sa_flags = SA_RESTART; 555 sa.sa_handler = sigquit; 556 (void)sigaction(SIGHUP, &sa, NULL); 557 (void)sigaction(SIGINT, &sa, NULL); 558 (void)sigaction(SIGQUIT, &sa, NULL); 559 (void)sigaction(SIGTERM, &sa, NULL); 560 561 sa.sa_handler = lostconn; 562 (void)sigaction(SIGPIPE, &sa, NULL); 563 564 addrlen = sizeof(ctrl_addr); 565 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 566 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 567 exit(1); 568 } 569 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 570 #ifdef VIRTUAL_HOSTING 571 /* select our identity from virtual host table */ 572 selecthost(&ctrl_addr); 573 #endif 574 #ifdef IP_TOS 575 if (ctrl_addr.su_family == AF_INET) 576 { 577 tos = IPTOS_LOWDELAY; 578 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 579 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 580 } 581 #endif 582 /* 583 * Disable Nagle on the control channel so that we don't have to wait 584 * for peer's ACK before issuing our next reply. 585 */ 586 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 587 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 588 589 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 590 591 /* set this here so klogin can use it... */ 592 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 593 594 /* Try to handle urgent data inline */ 595 #ifdef SO_OOBINLINE 596 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 597 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 598 #endif 599 600 #ifdef F_SETOWN 601 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 602 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 603 #endif 604 dolog((struct sockaddr *)&his_addr); 605 /* 606 * Set up default state 607 */ 608 data = -1; 609 type = TYPE_A; 610 form = FORM_N; 611 stru = STRU_F; 612 mode = MODE_S; 613 tmpline[0] = '\0'; 614 615 /* If logins are disabled, print out the message. */ 616 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 617 while (fgets(line, sizeof(line), fd) != NULL) { 618 if ((cp = strchr(line, '\n')) != NULL) 619 *cp = '\0'; 620 lreply(530, "%s", line); 621 } 622 (void) fflush(stdout); 623 (void) fclose(fd); 624 reply(530, "System not available."); 625 exit(0); 626 } 627 #ifdef VIRTUAL_HOSTING 628 if ((fd = fopen(thishost->welcome, "r")) != NULL) { 629 #else 630 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 631 #endif 632 while (fgets(line, sizeof(line), fd) != NULL) { 633 if ((cp = strchr(line, '\n')) != NULL) 634 *cp = '\0'; 635 lreply(220, "%s", line); 636 } 637 (void) fflush(stdout); 638 (void) fclose(fd); 639 /* reply(220,) must follow */ 640 } 641 #ifndef VIRTUAL_HOSTING 642 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 643 fatalerror("Ran out of memory."); 644 (void) gethostname(hostname, MAXHOSTNAMELEN - 1); 645 hostname[MAXHOSTNAMELEN - 1] = '\0'; 646 #endif 647 if (hostinfo) 648 reply(220, "%s FTP server (%s) ready.", hostname, version); 649 else 650 reply(220, "FTP server ready."); 651 for (;;) 652 (void) yyparse(); 653 /* NOTREACHED */ 654 } 655 656 static void 657 lostconn(int signo) 658 { 659 660 if (ftpdebug) 661 syslog(LOG_DEBUG, "lost connection"); 662 dologout(1); 663 } 664 665 static void 666 sigquit(int signo) 667 { 668 669 syslog(LOG_ERR, "got signal %d", signo); 670 dologout(1); 671 } 672 673 #ifdef VIRTUAL_HOSTING 674 /* 675 * read in virtual host tables (if they exist) 676 */ 677 678 static void 679 inithosts(void) 680 { 681 int insert; 682 size_t len; 683 FILE *fp; 684 char *cp, *mp, *line; 685 char *hostname; 686 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 687 struct ftphost *hrp, *lhrp; 688 struct addrinfo hints, *res, *ai; 689 690 /* 691 * Fill in the default host information 692 */ 693 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 694 fatalerror("Ran out of memory."); 695 if (gethostname(hostname, MAXHOSTNAMELEN) < 0) 696 hostname[0] = '\0'; 697 hostname[MAXHOSTNAMELEN - 1] = '\0'; 698 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 699 fatalerror("Ran out of memory."); 700 hrp->hostname = hostname; 701 hrp->hostinfo = NULL; 702 703 memset(&hints, 0, sizeof(hints)); 704 hints.ai_flags = AI_CANONNAME; 705 hints.ai_family = AF_UNSPEC; 706 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 707 hrp->hostinfo = res; 708 hrp->statfile = _PATH_FTPDSTATFILE; 709 hrp->welcome = _PATH_FTPWELCOME; 710 hrp->loginmsg = _PATH_FTPLOGINMESG; 711 hrp->anonuser = "ftp"; 712 hrp->next = NULL; 713 thishost = firsthost = lhrp = hrp; 714 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 715 int addrsize, gothost; 716 void *addr; 717 struct hostent *hp; 718 719 while ((line = fgetln(fp, &len)) != NULL) { 720 int i, hp_error; 721 722 /* skip comments */ 723 if (line[0] == '#') 724 continue; 725 if (line[len - 1] == '\n') { 726 line[len - 1] = '\0'; 727 mp = NULL; 728 } else { 729 if ((mp = malloc(len + 1)) == NULL) 730 fatalerror("Ran out of memory."); 731 memcpy(mp, line, len); 732 mp[len] = '\0'; 733 line = mp; 734 } 735 cp = strtok(line, " \t"); 736 /* skip empty lines */ 737 if (cp == NULL) 738 goto nextline; 739 vhost = cp; 740 741 /* set defaults */ 742 anonuser = "ftp"; 743 statfile = _PATH_FTPDSTATFILE; 744 welcome = _PATH_FTPWELCOME; 745 loginmsg = _PATH_FTPLOGINMESG; 746 747 /* 748 * Preparse the line so we can use its info 749 * for all the addresses associated with 750 * the virtual host name. 751 * Field 0, the virtual host name, is special: 752 * it's already parsed off and will be strdup'ed 753 * later, after we know its canonical form. 754 */ 755 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 756 if (*cp != '-' && (cp = strdup(cp))) 757 switch (i) { 758 case 1: /* anon user permissions */ 759 anonuser = cp; 760 break; 761 case 2: /* statistics file */ 762 statfile = cp; 763 break; 764 case 3: /* welcome message */ 765 welcome = cp; 766 break; 767 case 4: /* login message */ 768 loginmsg = cp; 769 break; 770 default: /* programming error */ 771 abort(); 772 /* NOTREACHED */ 773 } 774 775 hints.ai_flags = 0; 776 hints.ai_family = AF_UNSPEC; 777 hints.ai_flags = AI_PASSIVE; 778 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 779 goto nextline; 780 for (ai = res; ai != NULL && ai->ai_addr != NULL; 781 ai = ai->ai_next) { 782 783 gothost = 0; 784 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 785 struct addrinfo *hi; 786 787 for (hi = hrp->hostinfo; hi != NULL; 788 hi = hi->ai_next) 789 if (hi->ai_addrlen == ai->ai_addrlen && 790 memcmp(hi->ai_addr, 791 ai->ai_addr, 792 ai->ai_addr->sa_len) == 0) { 793 gothost++; 794 break; 795 } 796 if (gothost) 797 break; 798 } 799 if (hrp == NULL) { 800 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 801 goto nextline; 802 hrp->hostname = NULL; 803 insert = 1; 804 } else { 805 if (hrp->hostinfo && hrp->hostinfo != res) 806 freeaddrinfo(hrp->hostinfo); 807 insert = 0; /* host already in the chain */ 808 } 809 hrp->hostinfo = res; 810 811 /* 812 * determine hostname to use. 813 * force defined name if there is a valid alias 814 * otherwise fallback to primary hostname 815 */ 816 /* XXX: getaddrinfo() can't do alias check */ 817 switch(hrp->hostinfo->ai_family) { 818 case AF_INET: 819 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 820 addrsize = sizeof(struct in_addr); 821 break; 822 case AF_INET6: 823 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 824 addrsize = sizeof(struct in6_addr); 825 break; 826 default: 827 /* should not reach here */ 828 freeaddrinfo(hrp->hostinfo); 829 if (insert) 830 free(hrp); /*not in chain, can free*/ 831 else 832 hrp->hostinfo = NULL; /*mark as blank*/ 833 goto nextline; 834 /* NOTREACHED */ 835 } 836 if ((hp = getipnodebyaddr(addr, addrsize, 837 hrp->hostinfo->ai_family, 838 &hp_error)) != NULL) { 839 if (strcmp(vhost, hp->h_name) != 0) { 840 if (hp->h_aliases == NULL) 841 vhost = hp->h_name; 842 else { 843 i = 0; 844 while (hp->h_aliases[i] && 845 strcmp(vhost, hp->h_aliases[i]) != 0) 846 ++i; 847 if (hp->h_aliases[i] == NULL) 848 vhost = hp->h_name; 849 } 850 } 851 } 852 if (hrp->hostname && 853 strcmp(hrp->hostname, vhost) != 0) { 854 free(hrp->hostname); 855 hrp->hostname = NULL; 856 } 857 if (hrp->hostname == NULL && 858 (hrp->hostname = strdup(vhost)) == NULL) { 859 freeaddrinfo(hrp->hostinfo); 860 hrp->hostinfo = NULL; /* mark as blank */ 861 if (hp) 862 freehostent(hp); 863 goto nextline; 864 } 865 hrp->anonuser = anonuser; 866 hrp->statfile = statfile; 867 hrp->welcome = welcome; 868 hrp->loginmsg = loginmsg; 869 if (insert) { 870 hrp->next = NULL; 871 lhrp->next = hrp; 872 lhrp = hrp; 873 } 874 if (hp) 875 freehostent(hp); 876 } 877 nextline: 878 if (mp) 879 free(mp); 880 } 881 (void) fclose(fp); 882 } 883 } 884 885 static void 886 selecthost(union sockunion *su) 887 { 888 struct ftphost *hrp; 889 u_int16_t port; 890 #ifdef INET6 891 struct in6_addr *mapped_in6 = NULL; 892 #endif 893 struct addrinfo *hi; 894 895 #ifdef INET6 896 /* 897 * XXX IPv4 mapped IPv6 addr consideraton, 898 * specified in rfc2373. 899 */ 900 if (su->su_family == AF_INET6 && 901 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 902 mapped_in6 = &su->su_sin6.sin6_addr; 903 #endif 904 905 hrp = thishost = firsthost; /* default */ 906 port = su->su_port; 907 su->su_port = 0; 908 while (hrp != NULL) { 909 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 910 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 911 thishost = hrp; 912 break; 913 } 914 #ifdef INET6 915 /* XXX IPv4 mapped IPv6 addr consideraton */ 916 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 917 (memcmp(&mapped_in6->s6_addr[12], 918 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 919 sizeof(struct in_addr)) == 0)) { 920 thishost = hrp; 921 break; 922 } 923 #endif 924 } 925 hrp = hrp->next; 926 } 927 su->su_port = port; 928 /* setup static variables as appropriate */ 929 hostname = thishost->hostname; 930 ftpuser = thishost->anonuser; 931 } 932 #endif 933 934 /* 935 * Helper function for sgetpwnam(). 936 */ 937 static char * 938 sgetsave(char *s) 939 { 940 char *new = malloc((unsigned) strlen(s) + 1); 941 942 if (new == NULL) { 943 perror_reply(421, "Local resource failure: malloc"); 944 dologout(1); 945 /* NOTREACHED */ 946 } 947 (void) strcpy(new, s); 948 return (new); 949 } 950 951 /* 952 * Save the result of a getpwnam. Used for USER command, since 953 * the data returned must not be clobbered by any other command 954 * (e.g., globbing). 955 */ 956 static struct passwd * 957 sgetpwnam(char *name) 958 { 959 static struct passwd save; 960 struct passwd *p; 961 962 if ((p = getpwnam(name)) == NULL) 963 return (p); 964 if (save.pw_name) { 965 free(save.pw_name); 966 free(save.pw_passwd); 967 free(save.pw_gecos); 968 free(save.pw_dir); 969 free(save.pw_shell); 970 } 971 save = *p; 972 save.pw_name = sgetsave(p->pw_name); 973 save.pw_passwd = sgetsave(p->pw_passwd); 974 save.pw_gecos = sgetsave(p->pw_gecos); 975 save.pw_dir = sgetsave(p->pw_dir); 976 save.pw_shell = sgetsave(p->pw_shell); 977 return (&save); 978 } 979 980 static int login_attempts; /* number of failed login attempts */ 981 static int askpasswd; /* had user command, ask for passwd */ 982 static char curname[MAXLOGNAME]; /* current USER name */ 983 984 /* 985 * USER command. 986 * Sets global passwd pointer pw if named account exists and is acceptable; 987 * sets askpasswd if a PASS command is expected. If logged in previously, 988 * need to reset state. If name is "ftp" or "anonymous", the name is not in 989 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 990 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 991 * requesting login privileges. Disallow anyone who does not have a standard 992 * shell as returned by getusershell(). Disallow anyone mentioned in the file 993 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 994 */ 995 void 996 user(char *name) 997 { 998 char *cp, *shell; 999 1000 if (logged_in) { 1001 if (guest) { 1002 reply(530, "Can't change user from guest login."); 1003 return; 1004 } else if (dochroot) { 1005 reply(530, "Can't change user from chroot user."); 1006 return; 1007 } 1008 end_login(); 1009 } 1010 1011 guest = 0; 1012 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1013 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 1014 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 1015 reply(530, "User %s access denied.", name); 1016 #ifdef VIRTUAL_HOSTING 1017 else if ((pw = sgetpwnam(thishost->anonuser)) != NULL) { 1018 #else 1019 else if ((pw = sgetpwnam("ftp")) != NULL) { 1020 #endif 1021 guest = 1; 1022 askpasswd = 1; 1023 reply(331, 1024 "Guest login ok, send your email address as password."); 1025 } else 1026 reply(530, "User %s unknown.", name); 1027 if (!askpasswd && logging) 1028 syslog(LOG_NOTICE, 1029 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1030 return; 1031 } 1032 if (anon_only != 0) { 1033 reply(530, "Sorry, only anonymous ftp allowed."); 1034 return; 1035 } 1036 1037 if ((pw = sgetpwnam(name))) { 1038 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1039 shell = _PATH_BSHELL; 1040 while ((cp = getusershell()) != NULL) 1041 if (strcmp(cp, shell) == 0) 1042 break; 1043 endusershell(); 1044 1045 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1046 reply(530, "User %s access denied.", name); 1047 if (logging) 1048 syslog(LOG_NOTICE, 1049 "FTP LOGIN REFUSED FROM %s, %s", 1050 remotehost, name); 1051 pw = (struct passwd *) NULL; 1052 return; 1053 } 1054 } 1055 if (logging) 1056 strncpy(curname, name, sizeof(curname)-1); 1057 1058 pwok = 0; 1059 #ifdef USE_PAM 1060 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1061 #endif 1062 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1063 pwok = (pw != NULL) && 1064 opieaccessfile(remotehost) && 1065 opiealways(pw->pw_dir); 1066 reply(331, "Response to %s %s for %s.", 1067 opieprompt, pwok ? "requested" : "required", name); 1068 } else { 1069 pwok = 1; 1070 reply(331, "Password required for %s.", name); 1071 } 1072 askpasswd = 1; 1073 /* 1074 * Delay before reading passwd after first failed 1075 * attempt to slow down passwd-guessing programs. 1076 */ 1077 if (login_attempts) 1078 sleep((unsigned) login_attempts); 1079 } 1080 1081 /* 1082 * Check if a user is in the file "fname", 1083 * return a pointer to a malloc'd string with the rest 1084 * of the matching line in "residue" if not NULL. 1085 */ 1086 static int 1087 checkuser(char *fname, char *name, int pwset, char **residue) 1088 { 1089 FILE *fd; 1090 int found = 0; 1091 size_t len; 1092 char *line, *mp, *p; 1093 1094 if ((fd = fopen(fname, "r")) != NULL) { 1095 while (!found && (line = fgetln(fd, &len)) != NULL) { 1096 /* skip comments */ 1097 if (line[0] == '#') 1098 continue; 1099 if (line[len - 1] == '\n') { 1100 line[len - 1] = '\0'; 1101 mp = NULL; 1102 } else { 1103 if ((mp = malloc(len + 1)) == NULL) 1104 fatalerror("Ran out of memory."); 1105 memcpy(mp, line, len); 1106 mp[len] = '\0'; 1107 line = mp; 1108 } 1109 /* avoid possible leading and trailing whitespace */ 1110 p = strtok(line, " \t"); 1111 /* skip empty lines */ 1112 if (p == NULL) 1113 goto nextline; 1114 /* 1115 * if first chr is '@', check group membership 1116 */ 1117 if (p[0] == '@') { 1118 int i = 0; 1119 struct group *grp; 1120 1121 if (p[1] == '\0') /* single @ matches anyone */ 1122 found = 1; 1123 else { 1124 if ((grp = getgrnam(p+1)) == NULL) 1125 goto nextline; 1126 /* 1127 * Check user's default group 1128 */ 1129 if (pwset && grp->gr_gid == pw->pw_gid) 1130 found = 1; 1131 /* 1132 * Check supplementary groups 1133 */ 1134 while (!found && grp->gr_mem[i]) 1135 found = strcmp(name, 1136 grp->gr_mem[i++]) 1137 == 0; 1138 } 1139 } 1140 /* 1141 * Otherwise, just check for username match 1142 */ 1143 else 1144 found = strcmp(p, name) == 0; 1145 /* 1146 * Save the rest of line to "residue" if matched 1147 */ 1148 if (found && residue) { 1149 if ((p = strtok(NULL, "")) != NULL) 1150 p += strspn(p, " \t"); 1151 if (p && *p) { 1152 if ((*residue = strdup(p)) == NULL) 1153 fatalerror("Ran out of memory."); 1154 } else 1155 *residue = NULL; 1156 } 1157 nextline: 1158 if (mp) 1159 free(mp); 1160 } 1161 (void) fclose(fd); 1162 } 1163 return (found); 1164 } 1165 1166 /* 1167 * Terminate login as previous user, if any, resetting state; 1168 * used when USER command is given or login fails. 1169 */ 1170 static void 1171 end_login(void) 1172 { 1173 #ifdef USE_PAM 1174 int e; 1175 #endif 1176 1177 (void) seteuid((uid_t)0); 1178 if (logged_in && dowtmp) 1179 ftpd_logwtmp(ttyline, "", NULL); 1180 pw = NULL; 1181 #ifdef LOGIN_CAP 1182 setusercontext(NULL, getpwuid(0), (uid_t)0, 1183 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1184 LOGIN_SETMAC); 1185 #endif 1186 #ifdef USE_PAM 1187 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1188 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1189 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1190 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1191 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1192 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1193 pamh = NULL; 1194 #endif 1195 logged_in = 0; 1196 guest = 0; 1197 dochroot = 0; 1198 } 1199 1200 #ifdef USE_PAM 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 1222 reply = calloc(num_msg, sizeof *reply); 1223 if (reply == NULL) 1224 return PAM_BUF_ERR; 1225 1226 for (i = 0; i < num_msg; i++) { 1227 switch (msg[i]->msg_style) { 1228 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1229 reply[i].resp_retcode = PAM_SUCCESS; 1230 reply[i].resp = COPY_STRING(cred->uname); 1231 /* PAM frees resp. */ 1232 break; 1233 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1234 reply[i].resp_retcode = PAM_SUCCESS; 1235 reply[i].resp = COPY_STRING(cred->pass); 1236 /* PAM frees resp. */ 1237 break; 1238 case PAM_TEXT_INFO: 1239 case PAM_ERROR_MSG: 1240 reply[i].resp_retcode = PAM_SUCCESS; 1241 reply[i].resp = NULL; 1242 break; 1243 default: /* unknown message style */ 1244 free(reply); 1245 return PAM_CONV_ERR; 1246 } 1247 } 1248 1249 *resp = reply; 1250 return PAM_SUCCESS; 1251 } 1252 1253 /* 1254 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1255 * authenticated, or 1 if not authenticated. If some sort of PAM system 1256 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1257 * function returns -1. This can be used as an indication that we should 1258 * fall back to a different authentication mechanism. 1259 */ 1260 static int 1261 auth_pam(struct passwd **ppw, const char *pass) 1262 { 1263 pam_handle_t *pamh = NULL; 1264 const char *tmpl_user; 1265 const void *item; 1266 int rval; 1267 int e; 1268 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1269 struct pam_conv conv = { &auth_conv, &auth_cred }; 1270 1271 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1272 if (e != PAM_SUCCESS) { 1273 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e)); 1274 return -1; 1275 } 1276 1277 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1278 if (e != PAM_SUCCESS) { 1279 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1280 pam_strerror(pamh, e)); 1281 return -1; 1282 } 1283 1284 e = pam_authenticate(pamh, 0); 1285 switch (e) { 1286 case PAM_SUCCESS: 1287 /* 1288 * With PAM we support the concept of a "template" 1289 * user. The user enters a login name which is 1290 * authenticated by PAM, usually via a remote service 1291 * such as RADIUS or TACACS+. If authentication 1292 * succeeds, a different but related "template" name 1293 * is used for setting the credentials, shell, and 1294 * home directory. The name the user enters need only 1295 * exist on the remote authentication server, but the 1296 * template name must be present in the local password 1297 * database. 1298 * 1299 * This is supported by two various mechanisms in the 1300 * individual modules. However, from the application's 1301 * point of view, the template user is always passed 1302 * back as a changed value of the PAM_USER item. 1303 */ 1304 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1305 PAM_SUCCESS) { 1306 tmpl_user = (const char *) item; 1307 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1308 *ppw = getpwnam(tmpl_user); 1309 } else 1310 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1311 pam_strerror(pamh, e)); 1312 rval = 0; 1313 break; 1314 1315 case PAM_AUTH_ERR: 1316 case PAM_USER_UNKNOWN: 1317 case PAM_MAXTRIES: 1318 rval = 1; 1319 break; 1320 1321 default: 1322 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1323 rval = -1; 1324 break; 1325 } 1326 1327 if (rval == 0) { 1328 e = pam_acct_mgmt(pamh, 0); 1329 if (e == PAM_NEW_AUTHTOK_REQD) { 1330 e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); 1331 if (e != PAM_SUCCESS) { 1332 syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); 1333 rval = 1; 1334 } 1335 } else if (e != PAM_SUCCESS) { 1336 rval = 1; 1337 } 1338 } 1339 1340 if (rval != 0) { 1341 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1342 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1343 } 1344 pamh = NULL; 1345 } 1346 return rval; 1347 } 1348 1349 #endif /* USE_PAM */ 1350 1351 void 1352 pass(char *passwd) 1353 { 1354 int rval; 1355 FILE *fd; 1356 #ifdef LOGIN_CAP 1357 login_cap_t *lc = NULL; 1358 #endif 1359 #ifdef USE_PAM 1360 int e; 1361 #endif 1362 char *chrootdir; 1363 char *residue = NULL; 1364 char *xpasswd; 1365 1366 if (logged_in || askpasswd == 0) { 1367 reply(503, "Login with USER first."); 1368 return; 1369 } 1370 askpasswd = 0; 1371 if (!guest) { /* "ftp" is only account allowed no password */ 1372 if (pw == NULL) { 1373 rval = 1; /* failure below */ 1374 goto skip; 1375 } 1376 #ifdef USE_PAM 1377 rval = auth_pam(&pw, passwd); 1378 if (rval >= 0) { 1379 opieunlock(); 1380 goto skip; 1381 } 1382 #endif 1383 if (opieverify(&opiedata, passwd) == 0) 1384 xpasswd = pw->pw_passwd; 1385 else if (pwok) { 1386 xpasswd = crypt(passwd, pw->pw_passwd); 1387 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1388 xpasswd = ":"; 1389 } else { 1390 rval = 1; 1391 goto skip; 1392 } 1393 rval = strcmp(pw->pw_passwd, xpasswd); 1394 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1395 rval = 1; /* failure */ 1396 skip: 1397 /* 1398 * If rval == 1, the user failed the authentication check 1399 * above. If rval == 0, either PAM or local authentication 1400 * succeeded. 1401 */ 1402 if (rval) { 1403 reply(530, "Login incorrect."); 1404 if (logging) 1405 syslog(LOG_NOTICE, 1406 "FTP LOGIN FAILED FROM %s, %s", 1407 remotehost, curname); 1408 pw = NULL; 1409 if (login_attempts++ >= 5) { 1410 syslog(LOG_NOTICE, 1411 "repeated login failures from %s", 1412 remotehost); 1413 exit(0); 1414 } 1415 return; 1416 } 1417 } 1418 login_attempts = 0; /* this time successful */ 1419 if (setegid((gid_t)pw->pw_gid) < 0) { 1420 reply(550, "Can't set gid."); 1421 return; 1422 } 1423 /* May be overridden by login.conf */ 1424 (void) umask(defumask); 1425 #ifdef LOGIN_CAP 1426 if ((lc = login_getpwclass(pw)) != NULL) { 1427 char remote_ip[MAXHOSTNAMELEN]; 1428 1429 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1430 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1431 NI_NUMERICHOST); 1432 remote_ip[sizeof(remote_ip) - 1] = 0; 1433 if (!auth_hostok(lc, remotehost, remote_ip)) { 1434 syslog(LOG_INFO|LOG_AUTH, 1435 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1436 pw->pw_name); 1437 reply(530, "Permission denied.\n"); 1438 pw = NULL; 1439 return; 1440 } 1441 if (!auth_timeok(lc, time(NULL))) { 1442 reply(530, "Login not available right now.\n"); 1443 pw = NULL; 1444 return; 1445 } 1446 } 1447 setusercontext(lc, pw, (uid_t)0, 1448 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1449 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1450 #else 1451 setlogin(pw->pw_name); 1452 (void) initgroups(pw->pw_name, pw->pw_gid); 1453 #endif 1454 1455 #ifdef USE_PAM 1456 if (pamh) { 1457 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1458 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1459 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1460 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1461 } 1462 } 1463 #endif 1464 1465 /* open wtmp before chroot */ 1466 if (dowtmp) 1467 ftpd_logwtmp(ttyline, pw->pw_name, 1468 (struct sockaddr *)&his_addr); 1469 logged_in = 1; 1470 1471 if (guest && stats && statfd < 0) 1472 #ifdef VIRTUAL_HOSTING 1473 if ((statfd = open(thishost->statfile, O_WRONLY|O_APPEND)) < 0) 1474 #else 1475 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1476 #endif 1477 stats = 0; 1478 1479 dochroot = 1480 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1481 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1482 || login_getcapbool(lc, "ftp-chroot", 0) 1483 #endif 1484 ; 1485 chrootdir = NULL; 1486 /* 1487 * For a chrooted local user, 1488 * a) see whether ftpchroot(5) specifies a chroot directory, 1489 * b) extract the directory pathname from the line, 1490 * c) expand it to the absolute pathname if necessary. 1491 */ 1492 if (dochroot && residue && 1493 (chrootdir = strtok(residue, " \t")) != NULL && 1494 chrootdir[0] != '/') { 1495 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1496 if (chrootdir == NULL) 1497 fatalerror("Ran out of memory."); 1498 1499 } 1500 if (guest || dochroot) { 1501 /* 1502 * If no chroot directory set yet, use the login directory. 1503 * Copy it so it can be modified while pw->pw_dir stays intact. 1504 */ 1505 if (chrootdir == NULL && 1506 (chrootdir = strdup(pw->pw_dir)) == NULL) 1507 fatalerror("Ran out of memory."); 1508 /* 1509 * Check for the "/chroot/./home" syntax, 1510 * separate the chroot and home directory pathnames. 1511 */ 1512 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1513 *(homedir++) = '\0'; /* wipe '/' */ 1514 homedir++; /* skip '.' */ 1515 /* so chrootdir can be freed later */ 1516 if ((homedir = strdup(homedir)) == NULL) 1517 fatalerror("Ran out of memory."); 1518 } else { 1519 /* 1520 * We MUST do a chdir() after the chroot. Otherwise 1521 * the old current directory will be accessible as "." 1522 * outside the new root! 1523 */ 1524 homedir = "/"; 1525 } 1526 /* 1527 * Finally, do chroot() 1528 */ 1529 if (chroot(chrootdir) < 0) { 1530 reply(550, "Can't change root."); 1531 goto bad; 1532 } 1533 } else /* real user w/o chroot */ 1534 homedir = pw->pw_dir; 1535 /* 1536 * Set euid *before* doing chdir() so 1537 * a) the user won't be carried to a directory that he couldn't reach 1538 * on his own due to no permission to upper path components, 1539 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1540 * (uid 0 has no root power over NFS if not mapped explicitly.) 1541 */ 1542 if (seteuid((uid_t)pw->pw_uid) < 0) { 1543 reply(550, "Can't set uid."); 1544 goto bad; 1545 } 1546 if (chdir(homedir) < 0) { 1547 if (guest || dochroot) { 1548 reply(550, "Can't change to base directory."); 1549 goto bad; 1550 } else { 1551 if (chdir("/") < 0) { 1552 reply(550, "Root is inaccessible."); 1553 goto bad; 1554 } 1555 lreply(230, "No directory! Logging in with home=/"); 1556 } 1557 } 1558 1559 /* 1560 * Display a login message, if it exists. 1561 * N.B. reply(230,) must follow the message. 1562 */ 1563 #ifdef VIRTUAL_HOSTING 1564 if ((fd = fopen(thishost->loginmsg, "r")) != NULL) { 1565 #else 1566 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 1567 #endif 1568 char *cp, line[LINE_MAX]; 1569 1570 while (fgets(line, sizeof(line), fd) != NULL) { 1571 if ((cp = strchr(line, '\n')) != NULL) 1572 *cp = '\0'; 1573 lreply(230, "%s", line); 1574 } 1575 (void) fflush(stdout); 1576 (void) fclose(fd); 1577 } 1578 if (guest) { 1579 if (ident != NULL) 1580 free(ident); 1581 ident = strdup(passwd); 1582 if (ident == NULL) 1583 fatalerror("Ran out of memory."); 1584 1585 reply(230, "Guest login ok, access restrictions apply."); 1586 #ifdef SETPROCTITLE 1587 #ifdef VIRTUAL_HOSTING 1588 if (thishost != firsthost) 1589 snprintf(proctitle, sizeof(proctitle), 1590 "%s: anonymous(%s)/%s", remotehost, hostname, 1591 passwd); 1592 else 1593 #endif 1594 snprintf(proctitle, sizeof(proctitle), 1595 "%s: anonymous/%s", remotehost, passwd); 1596 setproctitle("%s", proctitle); 1597 #endif /* SETPROCTITLE */ 1598 if (logging) 1599 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1600 remotehost, passwd); 1601 } else { 1602 if (dochroot) 1603 reply(230, "User %s logged in, " 1604 "access restrictions apply.", pw->pw_name); 1605 else 1606 reply(230, "User %s logged in.", pw->pw_name); 1607 1608 #ifdef SETPROCTITLE 1609 snprintf(proctitle, sizeof(proctitle), 1610 "%s: user/%s", remotehost, pw->pw_name); 1611 setproctitle("%s", proctitle); 1612 #endif /* SETPROCTITLE */ 1613 if (logging) 1614 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1615 remotehost, pw->pw_name); 1616 } 1617 #ifdef LOGIN_CAP 1618 login_close(lc); 1619 #endif 1620 if (chrootdir) 1621 free(chrootdir); 1622 if (residue) 1623 free(residue); 1624 return; 1625 bad: 1626 /* Forget all about it... */ 1627 #ifdef LOGIN_CAP 1628 login_close(lc); 1629 #endif 1630 if (chrootdir) 1631 free(chrootdir); 1632 if (residue) 1633 free(residue); 1634 end_login(); 1635 } 1636 1637 void 1638 retrieve(char *cmd, char *name) 1639 { 1640 FILE *fin, *dout; 1641 struct stat st; 1642 int (*closefunc)(FILE *); 1643 time_t start; 1644 1645 if (cmd == 0) { 1646 fin = fopen(name, "r"), closefunc = fclose; 1647 st.st_size = 0; 1648 } else { 1649 char line[BUFSIZ]; 1650 1651 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1652 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1653 st.st_size = -1; 1654 st.st_blksize = BUFSIZ; 1655 } 1656 if (fin == NULL) { 1657 if (errno != 0) { 1658 perror_reply(550, name); 1659 if (cmd == 0) { 1660 LOGCMD("get", name); 1661 } 1662 } 1663 return; 1664 } 1665 byte_count = -1; 1666 if (cmd == 0) { 1667 if (fstat(fileno(fin), &st) < 0) { 1668 perror_reply(550, name); 1669 goto done; 1670 } 1671 if (!S_ISREG(st.st_mode)) { 1672 if (guest) { 1673 reply(550, "%s: not a plain file.", name); 1674 goto done; 1675 } 1676 st.st_size = -1; 1677 /* st.st_blksize is set for all descriptor types */ 1678 } 1679 } 1680 if (restart_point) { 1681 if (type == TYPE_A) { 1682 off_t i, n; 1683 int c; 1684 1685 n = restart_point; 1686 i = 0; 1687 while (i++ < n) { 1688 if ((c=getc(fin)) == EOF) { 1689 perror_reply(550, name); 1690 goto done; 1691 } 1692 if (c == '\n') 1693 i++; 1694 } 1695 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1696 perror_reply(550, name); 1697 goto done; 1698 } 1699 } 1700 dout = dataconn(name, st.st_size, "w"); 1701 if (dout == NULL) 1702 goto done; 1703 time(&start); 1704 send_data(fin, dout, st.st_blksize, st.st_size, 1705 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1706 if (cmd == 0 && guest && stats) 1707 logxfer(name, st.st_size, start); 1708 (void) fclose(dout); 1709 data = -1; 1710 pdata = -1; 1711 done: 1712 if (cmd == 0) 1713 LOGBYTES("get", name, byte_count); 1714 (*closefunc)(fin); 1715 } 1716 1717 void 1718 store(char *name, char *mode, int unique) 1719 { 1720 int fd; 1721 FILE *fout, *din; 1722 int (*closefunc)(FILE *); 1723 1724 if (*mode == 'a') { /* APPE */ 1725 if (unique) { 1726 /* Programming error */ 1727 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1728 unique = 0; 1729 } 1730 if (guest && noguestmod) { 1731 reply(550, "Appending to existing file denied"); 1732 goto err; 1733 } 1734 restart_point = 0; /* not affected by preceding REST */ 1735 } 1736 if (unique) /* STOU overrides REST */ 1737 restart_point = 0; 1738 if (guest && noguestmod) { 1739 if (restart_point) { /* guest STOR w/REST */ 1740 reply(550, "Modifying existing file denied"); 1741 goto err; 1742 } else /* treat guest STOR as STOU */ 1743 unique = 1; 1744 } 1745 1746 if (restart_point) 1747 mode = "r+"; /* so ASCII manual seek can work */ 1748 if (unique) { 1749 if ((fd = guniquefd(name, &name)) < 0) 1750 goto err; 1751 fout = fdopen(fd, mode); 1752 } else 1753 fout = fopen(name, mode); 1754 closefunc = fclose; 1755 if (fout == NULL) { 1756 perror_reply(553, name); 1757 goto err; 1758 } 1759 byte_count = -1; 1760 if (restart_point) { 1761 if (type == TYPE_A) { 1762 off_t i, n; 1763 int c; 1764 1765 n = restart_point; 1766 i = 0; 1767 while (i++ < n) { 1768 if ((c=getc(fout)) == EOF) { 1769 perror_reply(550, name); 1770 goto done; 1771 } 1772 if (c == '\n') 1773 i++; 1774 } 1775 /* 1776 * We must do this seek to "current" position 1777 * because we are changing from reading to 1778 * writing. 1779 */ 1780 if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) { 1781 perror_reply(550, name); 1782 goto done; 1783 } 1784 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1785 perror_reply(550, name); 1786 goto done; 1787 } 1788 } 1789 din = dataconn(name, (off_t)-1, "r"); 1790 if (din == NULL) 1791 goto done; 1792 if (receive_data(din, fout) == 0) { 1793 if (unique) 1794 reply(226, "Transfer complete (unique file name:%s).", 1795 name); 1796 else 1797 reply(226, "Transfer complete."); 1798 } 1799 (void) fclose(din); 1800 data = -1; 1801 pdata = -1; 1802 done: 1803 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1804 (*closefunc)(fout); 1805 return; 1806 err: 1807 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1808 return; 1809 } 1810 1811 static FILE * 1812 getdatasock(char *mode) 1813 { 1814 int on = 1, s, t, tries; 1815 1816 if (data >= 0) 1817 return (fdopen(data, mode)); 1818 (void) seteuid((uid_t)0); 1819 1820 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1821 if (s < 0) 1822 goto bad; 1823 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1824 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1825 /* anchor socket to avoid multi-homing problems */ 1826 data_source = ctrl_addr; 1827 data_source.su_port = htons(dataport); 1828 for (tries = 1; ; tries++) { 1829 if (bind(s, (struct sockaddr *)&data_source, 1830 data_source.su_len) >= 0) 1831 break; 1832 if (errno != EADDRINUSE || tries > 10) 1833 goto bad; 1834 sleep(tries); 1835 } 1836 (void) seteuid((uid_t)pw->pw_uid); 1837 #ifdef IP_TOS 1838 if (data_source.su_family == AF_INET) 1839 { 1840 on = IPTOS_THROUGHPUT; 1841 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1842 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1843 } 1844 #endif 1845 #ifdef TCP_NOPUSH 1846 /* 1847 * Turn off push flag to keep sender TCP from sending short packets 1848 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1849 * to set the send buffer size as well, but that may not be desirable 1850 * in heavy-load situations. 1851 */ 1852 on = 1; 1853 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1854 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1855 #endif 1856 #ifdef SO_SNDBUF 1857 on = 65536; 1858 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1859 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1860 #endif 1861 1862 return (fdopen(s, mode)); 1863 bad: 1864 /* Return the real value of errno (close may change it) */ 1865 t = errno; 1866 (void) seteuid((uid_t)pw->pw_uid); 1867 (void) close(s); 1868 errno = t; 1869 return (NULL); 1870 } 1871 1872 static FILE * 1873 dataconn(char *name, off_t size, char *mode) 1874 { 1875 char sizebuf[32]; 1876 FILE *file; 1877 int retry = 0, tos, conerrno; 1878 1879 file_size = size; 1880 byte_count = 0; 1881 if (size != (off_t) -1) 1882 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size); 1883 else 1884 *sizebuf = '\0'; 1885 if (pdata >= 0) { 1886 union sockunion from; 1887 int flags; 1888 int s, fromlen = ctrl_addr.su_len; 1889 struct timeval timeout; 1890 fd_set set; 1891 1892 FD_ZERO(&set); 1893 FD_SET(pdata, &set); 1894 1895 timeout.tv_usec = 0; 1896 timeout.tv_sec = 120; 1897 1898 /* 1899 * Granted a socket is in the blocking I/O mode, 1900 * accept() will block after a successful select() 1901 * if the selected connection dies in between. 1902 * Therefore set the non-blocking I/O flag here. 1903 */ 1904 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1905 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1906 goto pdata_err; 1907 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) <= 0 || 1908 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1909 goto pdata_err; 1910 (void) close(pdata); 1911 pdata = s; 1912 /* 1913 * Unset the inherited non-blocking I/O flag 1914 * on the child socket so stdio can work on it. 1915 */ 1916 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1917 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1918 goto pdata_err; 1919 #ifdef IP_TOS 1920 if (from.su_family == AF_INET) 1921 { 1922 tos = IPTOS_THROUGHPUT; 1923 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1924 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1925 } 1926 #endif 1927 reply(150, "Opening %s mode data connection for '%s'%s.", 1928 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1929 return (fdopen(pdata, mode)); 1930 pdata_err: 1931 reply(425, "Can't open data connection."); 1932 (void) close(pdata); 1933 pdata = -1; 1934 return (NULL); 1935 } 1936 if (data >= 0) { 1937 reply(125, "Using existing data connection for '%s'%s.", 1938 name, sizebuf); 1939 usedefault = 1; 1940 return (fdopen(data, mode)); 1941 } 1942 if (usedefault) 1943 data_dest = his_addr; 1944 usedefault = 1; 1945 do { 1946 file = getdatasock(mode); 1947 if (file == NULL) { 1948 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1949 getnameinfo((struct sockaddr *)&data_source, 1950 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1951 portbuf, sizeof(portbuf), 1952 NI_NUMERICHOST|NI_NUMERICSERV); 1953 reply(425, "Can't create data socket (%s,%s): %s.", 1954 hostbuf, portbuf, strerror(errno)); 1955 return (NULL); 1956 } 1957 data = fileno(file); 1958 conerrno = 0; 1959 if (connect(data, (struct sockaddr *)&data_dest, 1960 data_dest.su_len) == 0) 1961 break; 1962 conerrno = errno; 1963 (void) fclose(file); 1964 data = -1; 1965 if (conerrno == EADDRINUSE) { 1966 sleep((unsigned) swaitint); 1967 retry += swaitint; 1968 } else { 1969 break; 1970 } 1971 } while (retry <= swaitmax); 1972 if (conerrno != 0) { 1973 perror_reply(425, "Can't build data connection"); 1974 return (NULL); 1975 } 1976 reply(150, "Opening %s mode data connection for '%s'%s.", 1977 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1978 return (file); 1979 } 1980 1981 /* 1982 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1983 * encapsulation of the data subject to Mode, Structure, and Type. 1984 * 1985 * NB: Form isn't handled. 1986 */ 1987 static int 1988 send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1989 { 1990 int c, filefd, netfd; 1991 char *buf; 1992 off_t cnt; 1993 1994 transflag++; 1995 switch (type) { 1996 1997 case TYPE_A: 1998 while ((c = getc(instr)) != EOF) { 1999 if (recvurg) 2000 goto got_oob; 2001 byte_count++; 2002 if (c == '\n') { 2003 if (ferror(outstr)) 2004 goto data_err; 2005 (void) putc('\r', outstr); 2006 } 2007 (void) putc(c, outstr); 2008 } 2009 if (recvurg) 2010 goto got_oob; 2011 fflush(outstr); 2012 transflag = 0; 2013 if (ferror(instr)) 2014 goto file_err; 2015 if (ferror(outstr)) 2016 goto data_err; 2017 reply(226, "Transfer complete."); 2018 return (0); 2019 2020 case TYPE_I: 2021 case TYPE_L: 2022 /* 2023 * isreg is only set if we are not doing restart and we 2024 * are sending a regular file 2025 */ 2026 netfd = fileno(outstr); 2027 filefd = fileno(instr); 2028 2029 if (isreg) { 2030 2031 off_t offset; 2032 int err; 2033 2034 err = cnt = offset = 0; 2035 2036 while (err != -1 && filesize > 0) { 2037 err = sendfile(filefd, netfd, offset, 0, 2038 (struct sf_hdtr *) NULL, &cnt, 0); 2039 /* 2040 * Calculate byte_count before OOB processing. 2041 * It can be used in myoob() later. 2042 */ 2043 byte_count += cnt; 2044 if (recvurg) 2045 goto got_oob; 2046 offset += cnt; 2047 filesize -= cnt; 2048 2049 if (err == -1) { 2050 if (!cnt) 2051 goto oldway; 2052 2053 goto data_err; 2054 } 2055 } 2056 2057 transflag = 0; 2058 reply(226, "Transfer complete."); 2059 return (0); 2060 } 2061 2062 oldway: 2063 if ((buf = malloc((u_int)blksize)) == NULL) { 2064 transflag = 0; 2065 perror_reply(451, "Local resource failure: malloc"); 2066 return (-1); 2067 } 2068 2069 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 2070 write(netfd, buf, cnt) == cnt) 2071 byte_count += cnt; 2072 transflag = 0; 2073 (void)free(buf); 2074 if (cnt != 0) { 2075 if (cnt < 0) 2076 goto file_err; 2077 goto data_err; 2078 } 2079 reply(226, "Transfer complete."); 2080 return (0); 2081 default: 2082 transflag = 0; 2083 reply(550, "Unimplemented TYPE %d in send_data", type); 2084 return (-1); 2085 } 2086 2087 data_err: 2088 transflag = 0; 2089 perror_reply(426, "Data connection"); 2090 return (-1); 2091 2092 file_err: 2093 transflag = 0; 2094 perror_reply(551, "Error on input file"); 2095 return (-1); 2096 2097 got_oob: 2098 myoob(); 2099 recvurg = 0; 2100 transflag = 0; 2101 return (-1); 2102 } 2103 2104 /* 2105 * Transfer data from peer to "outstr" using the appropriate encapulation of 2106 * the data subject to Mode, Structure, and Type. 2107 * 2108 * N.B.: Form isn't handled. 2109 */ 2110 static int 2111 receive_data(FILE *instr, FILE *outstr) 2112 { 2113 int c; 2114 int cnt, bare_lfs; 2115 char buf[BUFSIZ]; 2116 2117 transflag++; 2118 bare_lfs = 0; 2119 2120 switch (type) { 2121 2122 case TYPE_I: 2123 case TYPE_L: 2124 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 2125 if (recvurg) 2126 goto got_oob; 2127 if (write(fileno(outstr), buf, cnt) != cnt) 2128 goto file_err; 2129 byte_count += cnt; 2130 } 2131 if (recvurg) 2132 goto got_oob; 2133 if (cnt < 0) 2134 goto data_err; 2135 transflag = 0; 2136 return (0); 2137 2138 case TYPE_E: 2139 reply(553, "TYPE E not implemented."); 2140 transflag = 0; 2141 return (-1); 2142 2143 case TYPE_A: 2144 while ((c = getc(instr)) != EOF) { 2145 if (recvurg) 2146 goto got_oob; 2147 byte_count++; 2148 if (c == '\n') 2149 bare_lfs++; 2150 while (c == '\r') { 2151 if (ferror(outstr)) 2152 goto data_err; 2153 if ((c = getc(instr)) != '\n') { 2154 (void) putc ('\r', outstr); 2155 if (c == '\0' || c == EOF) 2156 goto contin2; 2157 } 2158 } 2159 (void) putc(c, outstr); 2160 contin2: ; 2161 } 2162 if (recvurg) 2163 goto got_oob; 2164 fflush(outstr); 2165 if (ferror(instr)) 2166 goto data_err; 2167 if (ferror(outstr)) 2168 goto file_err; 2169 transflag = 0; 2170 if (bare_lfs) { 2171 lreply(226, 2172 "WARNING! %d bare linefeeds received in ASCII mode", 2173 bare_lfs); 2174 (void)printf(" File may not have transferred correctly.\r\n"); 2175 } 2176 return (0); 2177 default: 2178 reply(550, "Unimplemented TYPE %d in receive_data", type); 2179 transflag = 0; 2180 return (-1); 2181 } 2182 2183 data_err: 2184 transflag = 0; 2185 perror_reply(426, "Data Connection"); 2186 return (-1); 2187 2188 file_err: 2189 transflag = 0; 2190 perror_reply(452, "Error writing file"); 2191 return (-1); 2192 2193 got_oob: 2194 myoob(); 2195 recvurg = 0; 2196 transflag = 0; 2197 return (-1); 2198 } 2199 2200 void 2201 statfilecmd(char *filename) 2202 { 2203 FILE *fin; 2204 int atstart; 2205 int c; 2206 char line[LINE_MAX]; 2207 2208 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2209 fin = ftpd_popen(line, "r"); 2210 lreply(211, "status of %s:", filename); 2211 atstart = 1; 2212 while ((c = getc(fin)) != EOF) { 2213 if (c == '\n') { 2214 if (ferror(stdout)){ 2215 perror_reply(421, "control connection"); 2216 (void) ftpd_pclose(fin); 2217 dologout(1); 2218 /* NOTREACHED */ 2219 } 2220 if (ferror(fin)) { 2221 perror_reply(551, filename); 2222 (void) ftpd_pclose(fin); 2223 return; 2224 } 2225 (void) putc('\r', stdout); 2226 } 2227 /* 2228 * RFC 959 says neutral text should be prepended before 2229 * a leading 3-digit number followed by whitespace, but 2230 * many ftp clients can be confused by any leading digits, 2231 * as a matter of fact. 2232 */ 2233 if (atstart && isdigit(c)) 2234 (void) putc(' ', stdout); 2235 (void) putc(c, stdout); 2236 atstart = (c == '\n'); 2237 } 2238 (void) ftpd_pclose(fin); 2239 reply(211, "End of Status"); 2240 } 2241 2242 void 2243 statcmd(void) 2244 { 2245 union sockunion *su; 2246 u_char *a, *p; 2247 char hname[NI_MAXHOST]; 2248 int ispassive; 2249 2250 if (hostinfo) { 2251 lreply(211, "%s FTP server status:", hostname); 2252 printf(" %s\r\n", version); 2253 } else 2254 lreply(211, "FTP server status:"); 2255 printf(" Connected to %s", remotehost); 2256 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2257 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2258 if (strcmp(hname, remotehost) != 0) 2259 printf(" (%s)", hname); 2260 } 2261 printf("\r\n"); 2262 if (logged_in) { 2263 if (guest) 2264 printf(" Logged in anonymously\r\n"); 2265 else 2266 printf(" Logged in as %s\r\n", pw->pw_name); 2267 } else if (askpasswd) 2268 printf(" Waiting for password\r\n"); 2269 else 2270 printf(" Waiting for user name\r\n"); 2271 printf(" TYPE: %s", typenames[type]); 2272 if (type == TYPE_A || type == TYPE_E) 2273 printf(", FORM: %s", formnames[form]); 2274 if (type == TYPE_L) 2275 #if CHAR_BIT == 8 2276 printf(" %d", CHAR_BIT); 2277 #else 2278 printf(" %d", bytesize); /* need definition! */ 2279 #endif 2280 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2281 strunames[stru], modenames[mode]); 2282 if (data != -1) 2283 printf(" Data connection open\r\n"); 2284 else if (pdata != -1) { 2285 ispassive = 1; 2286 su = &pasv_addr; 2287 goto printaddr; 2288 } else if (usedefault == 0) { 2289 ispassive = 0; 2290 su = &data_dest; 2291 printaddr: 2292 #define UC(b) (((int) b) & 0xff) 2293 if (epsvall) { 2294 printf(" EPSV only mode (EPSV ALL)\r\n"); 2295 goto epsvonly; 2296 } 2297 2298 /* PORT/PASV */ 2299 if (su->su_family == AF_INET) { 2300 a = (u_char *) &su->su_sin.sin_addr; 2301 p = (u_char *) &su->su_sin.sin_port; 2302 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2303 ispassive ? "PASV" : "PORT", 2304 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2305 UC(p[0]), UC(p[1])); 2306 } 2307 2308 /* LPRT/LPSV */ 2309 { 2310 int alen, af, i; 2311 2312 switch (su->su_family) { 2313 case AF_INET: 2314 a = (u_char *) &su->su_sin.sin_addr; 2315 p = (u_char *) &su->su_sin.sin_port; 2316 alen = sizeof(su->su_sin.sin_addr); 2317 af = 4; 2318 break; 2319 case AF_INET6: 2320 a = (u_char *) &su->su_sin6.sin6_addr; 2321 p = (u_char *) &su->su_sin6.sin6_port; 2322 alen = sizeof(su->su_sin6.sin6_addr); 2323 af = 6; 2324 break; 2325 default: 2326 af = 0; 2327 break; 2328 } 2329 if (af) { 2330 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2331 af, alen); 2332 for (i = 0; i < alen; i++) 2333 printf("%d,", UC(a[i])); 2334 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2335 } 2336 } 2337 2338 epsvonly:; 2339 /* EPRT/EPSV */ 2340 { 2341 int af; 2342 2343 switch (su->su_family) { 2344 case AF_INET: 2345 af = 1; 2346 break; 2347 case AF_INET6: 2348 af = 2; 2349 break; 2350 default: 2351 af = 0; 2352 break; 2353 } 2354 if (af) { 2355 union sockunion tmp; 2356 2357 tmp = *su; 2358 if (tmp.su_family == AF_INET6) 2359 tmp.su_sin6.sin6_scope_id = 0; 2360 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2361 hname, sizeof(hname) - 1, NULL, 0, 2362 NI_NUMERICHOST)) { 2363 printf(" %s |%d|%s|%d|\r\n", 2364 ispassive ? "EPSV" : "EPRT", 2365 af, hname, htons(tmp.su_port)); 2366 } 2367 } 2368 } 2369 #undef UC 2370 } else 2371 printf(" No data connection\r\n"); 2372 reply(211, "End of status"); 2373 } 2374 2375 void 2376 fatalerror(char *s) 2377 { 2378 2379 reply(451, "Error in server: %s\n", s); 2380 reply(221, "Closing connection due to server error."); 2381 dologout(0); 2382 /* NOTREACHED */ 2383 } 2384 2385 void 2386 reply(int n, const char *fmt, ...) 2387 { 2388 va_list ap; 2389 2390 va_start(ap, fmt); 2391 (void)printf("%d ", n); 2392 (void)vprintf(fmt, ap); 2393 (void)printf("\r\n"); 2394 (void)fflush(stdout); 2395 if (ftpdebug) { 2396 syslog(LOG_DEBUG, "<--- %d ", n); 2397 vsyslog(LOG_DEBUG, fmt, ap); 2398 } 2399 } 2400 2401 void 2402 lreply(int n, const char *fmt, ...) 2403 { 2404 va_list ap; 2405 2406 va_start(ap, fmt); 2407 (void)printf("%d- ", n); 2408 (void)vprintf(fmt, ap); 2409 (void)printf("\r\n"); 2410 (void)fflush(stdout); 2411 if (ftpdebug) { 2412 syslog(LOG_DEBUG, "<--- %d- ", n); 2413 vsyslog(LOG_DEBUG, fmt, ap); 2414 } 2415 } 2416 2417 static void 2418 ack(char *s) 2419 { 2420 2421 reply(250, "%s command successful.", s); 2422 } 2423 2424 void 2425 nack(char *s) 2426 { 2427 2428 reply(502, "%s command not implemented.", s); 2429 } 2430 2431 /* ARGSUSED */ 2432 void 2433 yyerror(char *s) 2434 { 2435 char *cp; 2436 2437 if ((cp = strchr(cbuf,'\n'))) 2438 *cp = '\0'; 2439 reply(500, "'%s': command not understood.", cbuf); 2440 } 2441 2442 void 2443 delete(char *name) 2444 { 2445 struct stat st; 2446 2447 LOGCMD("delete", name); 2448 if (lstat(name, &st) < 0) { 2449 perror_reply(550, name); 2450 return; 2451 } 2452 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2453 if (rmdir(name) < 0) { 2454 perror_reply(550, name); 2455 return; 2456 } 2457 goto done; 2458 } 2459 if (unlink(name) < 0) { 2460 perror_reply(550, name); 2461 return; 2462 } 2463 done: 2464 ack("DELE"); 2465 } 2466 2467 void 2468 cwd(char *path) 2469 { 2470 2471 if (chdir(path) < 0) 2472 perror_reply(550, path); 2473 else 2474 ack("CWD"); 2475 } 2476 2477 void 2478 makedir(char *name) 2479 { 2480 char *s; 2481 2482 LOGCMD("mkdir", name); 2483 if (guest && noguestmkd) 2484 reply(550, "%s: permission denied", name); 2485 else if (mkdir(name, 0777) < 0) 2486 perror_reply(550, name); 2487 else { 2488 if ((s = doublequote(name)) == NULL) 2489 fatalerror("Ran out of memory."); 2490 reply(257, "\"%s\" directory created.", s); 2491 free(s); 2492 } 2493 } 2494 2495 void 2496 removedir(char *name) 2497 { 2498 2499 LOGCMD("rmdir", name); 2500 if (rmdir(name) < 0) 2501 perror_reply(550, name); 2502 else 2503 ack("RMD"); 2504 } 2505 2506 void 2507 pwd(void) 2508 { 2509 char *s, path[MAXPATHLEN + 1]; 2510 2511 if (getwd(path) == (char *)NULL) 2512 reply(550, "%s.", path); 2513 else { 2514 if ((s = doublequote(path)) == NULL) 2515 fatalerror("Ran out of memory."); 2516 reply(257, "\"%s\" is current directory.", s); 2517 free(s); 2518 } 2519 } 2520 2521 char * 2522 renamefrom(char *name) 2523 { 2524 struct stat st; 2525 2526 if (lstat(name, &st) < 0) { 2527 perror_reply(550, name); 2528 return ((char *)0); 2529 } 2530 reply(350, "File exists, ready for destination name"); 2531 return (name); 2532 } 2533 2534 void 2535 renamecmd(char *from, char *to) 2536 { 2537 struct stat st; 2538 2539 LOGCMD2("rename", from, to); 2540 2541 if (guest && (stat(to, &st) == 0)) { 2542 reply(550, "%s: permission denied", to); 2543 return; 2544 } 2545 2546 if (rename(from, to) < 0) 2547 perror_reply(550, "rename"); 2548 else 2549 ack("RNTO"); 2550 } 2551 2552 static void 2553 dolog(struct sockaddr *who) 2554 { 2555 int error; 2556 2557 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2558 2559 #ifdef SETPROCTITLE 2560 #ifdef VIRTUAL_HOSTING 2561 if (thishost != firsthost) 2562 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2563 remotehost, hostname); 2564 else 2565 #endif 2566 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2567 remotehost); 2568 setproctitle("%s", proctitle); 2569 #endif /* SETPROCTITLE */ 2570 2571 if (logging) { 2572 #ifdef VIRTUAL_HOSTING 2573 if (thishost != firsthost) 2574 syslog(LOG_INFO, "connection from %s (to %s)", 2575 remotehost, hostname); 2576 else 2577 #endif 2578 { 2579 char who_name[MAXHOSTNAMELEN]; 2580 2581 error = getnameinfo(who, who->sa_len, 2582 who_name, sizeof(who_name) - 1, 2583 NULL, 0, NI_NUMERICHOST); 2584 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2585 error == 0 ? who_name : ""); 2586 } 2587 } 2588 } 2589 2590 /* 2591 * Record logout in wtmp file 2592 * and exit with supplied status. 2593 */ 2594 void 2595 dologout(int status) 2596 { 2597 /* 2598 * Prevent reception of SIGURG from resulting in a resumption 2599 * back to the main program loop. 2600 */ 2601 transflag = 0; 2602 2603 if (logged_in && dowtmp) { 2604 (void) seteuid((uid_t)0); 2605 ftpd_logwtmp(ttyline, "", NULL); 2606 } 2607 /* beware of flushing buffers after a SIGPIPE */ 2608 _exit(status); 2609 } 2610 2611 static void 2612 sigurg(int signo) 2613 { 2614 2615 recvurg = 1; 2616 } 2617 2618 static void 2619 myoob(void) 2620 { 2621 char *cp; 2622 2623 /* only process if transfer occurring */ 2624 if (!transflag) 2625 return; 2626 cp = tmpline; 2627 if (getline(cp, 7, stdin) == NULL) { 2628 reply(221, "You could at least say goodbye."); 2629 dologout(0); 2630 } 2631 upper(cp); 2632 if (strcmp(cp, "ABOR\r\n") == 0) { 2633 tmpline[0] = '\0'; 2634 reply(426, "Transfer aborted. Data connection closed."); 2635 reply(226, "Abort successful"); 2636 } 2637 if (strcmp(cp, "STAT\r\n") == 0) { 2638 tmpline[0] = '\0'; 2639 if (file_size != (off_t) -1) 2640 reply(213, "Status: %qd of %qd bytes transferred", 2641 byte_count, file_size); 2642 else 2643 reply(213, "Status: %qd bytes transferred", byte_count); 2644 } 2645 } 2646 2647 /* 2648 * Note: a response of 425 is not mentioned as a possible response to 2649 * the PASV command in RFC959. However, it has been blessed as 2650 * a legitimate response by Jon Postel in a telephone conversation 2651 * with Rick Adams on 25 Jan 89. 2652 */ 2653 void 2654 passive(void) 2655 { 2656 int len, on; 2657 char *p, *a; 2658 2659 if (pdata >= 0) /* close old port if one set */ 2660 close(pdata); 2661 2662 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2663 if (pdata < 0) { 2664 perror_reply(425, "Can't open passive connection"); 2665 return; 2666 } 2667 on = 1; 2668 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2669 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2670 2671 (void) seteuid((uid_t)0); 2672 2673 #ifdef IP_PORTRANGE 2674 if (ctrl_addr.su_family == AF_INET) { 2675 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2676 : IP_PORTRANGE_DEFAULT; 2677 2678 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2679 &on, sizeof(on)) < 0) 2680 goto pasv_error; 2681 } 2682 #endif 2683 #ifdef IPV6_PORTRANGE 2684 if (ctrl_addr.su_family == AF_INET6) { 2685 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2686 : IPV6_PORTRANGE_DEFAULT; 2687 2688 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2689 &on, sizeof(on)) < 0) 2690 goto pasv_error; 2691 } 2692 #endif 2693 2694 pasv_addr = ctrl_addr; 2695 pasv_addr.su_port = 0; 2696 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2697 goto pasv_error; 2698 2699 (void) seteuid((uid_t)pw->pw_uid); 2700 2701 len = sizeof(pasv_addr); 2702 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2703 goto pasv_error; 2704 if (listen(pdata, 1) < 0) 2705 goto pasv_error; 2706 if (pasv_addr.su_family == AF_INET) 2707 a = (char *) &pasv_addr.su_sin.sin_addr; 2708 else if (pasv_addr.su_family == AF_INET6 && 2709 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2710 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2711 else 2712 goto pasv_error; 2713 2714 p = (char *) &pasv_addr.su_port; 2715 2716 #define UC(b) (((int) b) & 0xff) 2717 2718 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2719 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2720 return; 2721 2722 pasv_error: 2723 (void) seteuid((uid_t)pw->pw_uid); 2724 (void) close(pdata); 2725 pdata = -1; 2726 perror_reply(425, "Can't open passive connection"); 2727 return; 2728 } 2729 2730 /* 2731 * Long Passive defined in RFC 1639. 2732 * 228 Entering Long Passive Mode 2733 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2734 */ 2735 2736 void 2737 long_passive(char *cmd, int pf) 2738 { 2739 int len, on; 2740 char *p, *a; 2741 2742 if (pdata >= 0) /* close old port if one set */ 2743 close(pdata); 2744 2745 if (pf != PF_UNSPEC) { 2746 if (ctrl_addr.su_family != pf) { 2747 switch (ctrl_addr.su_family) { 2748 case AF_INET: 2749 pf = 1; 2750 break; 2751 case AF_INET6: 2752 pf = 2; 2753 break; 2754 default: 2755 pf = 0; 2756 break; 2757 } 2758 /* 2759 * XXX 2760 * only EPRT/EPSV ready clients will understand this 2761 */ 2762 if (strcmp(cmd, "EPSV") == 0 && pf) { 2763 reply(522, "Network protocol mismatch, " 2764 "use (%d)", pf); 2765 } else 2766 reply(501, "Network protocol mismatch"); /*XXX*/ 2767 2768 return; 2769 } 2770 } 2771 2772 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2773 if (pdata < 0) { 2774 perror_reply(425, "Can't open passive connection"); 2775 return; 2776 } 2777 on = 1; 2778 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2779 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2780 2781 (void) seteuid((uid_t)0); 2782 2783 pasv_addr = ctrl_addr; 2784 pasv_addr.su_port = 0; 2785 len = pasv_addr.su_len; 2786 2787 #ifdef IP_PORTRANGE 2788 if (ctrl_addr.su_family == AF_INET) { 2789 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2790 : IP_PORTRANGE_DEFAULT; 2791 2792 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2793 &on, sizeof(on)) < 0) 2794 goto pasv_error; 2795 } 2796 #endif 2797 #ifdef IPV6_PORTRANGE 2798 if (ctrl_addr.su_family == AF_INET6) { 2799 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2800 : IPV6_PORTRANGE_DEFAULT; 2801 2802 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2803 &on, sizeof(on)) < 0) 2804 goto pasv_error; 2805 } 2806 #endif 2807 2808 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2809 goto pasv_error; 2810 2811 (void) seteuid((uid_t)pw->pw_uid); 2812 2813 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2814 goto pasv_error; 2815 if (listen(pdata, 1) < 0) 2816 goto pasv_error; 2817 2818 #define UC(b) (((int) b) & 0xff) 2819 2820 if (strcmp(cmd, "LPSV") == 0) { 2821 p = (char *)&pasv_addr.su_port; 2822 switch (pasv_addr.su_family) { 2823 case AF_INET: 2824 a = (char *) &pasv_addr.su_sin.sin_addr; 2825 v4_reply: 2826 reply(228, 2827 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2828 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2829 2, UC(p[0]), UC(p[1])); 2830 return; 2831 case AF_INET6: 2832 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2833 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2834 goto v4_reply; 2835 } 2836 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2837 reply(228, 2838 "Entering Long Passive Mode " 2839 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2840 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2841 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2842 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2843 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2844 2, UC(p[0]), UC(p[1])); 2845 return; 2846 } 2847 } else if (strcmp(cmd, "EPSV") == 0) { 2848 switch (pasv_addr.su_family) { 2849 case AF_INET: 2850 case AF_INET6: 2851 reply(229, "Entering Extended Passive Mode (|||%d|)", 2852 ntohs(pasv_addr.su_port)); 2853 return; 2854 } 2855 } else { 2856 /* more proper error code? */ 2857 } 2858 2859 pasv_error: 2860 (void) seteuid((uid_t)pw->pw_uid); 2861 (void) close(pdata); 2862 pdata = -1; 2863 perror_reply(425, "Can't open passive connection"); 2864 return; 2865 } 2866 2867 /* 2868 * Generate unique name for file with basename "local" 2869 * and open the file in order to avoid possible races. 2870 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2871 * Return descriptor to the file, set "name" to its name. 2872 * 2873 * Generates failure reply on error. 2874 */ 2875 static int 2876 guniquefd(char *local, char **name) 2877 { 2878 static char new[MAXPATHLEN]; 2879 struct stat st; 2880 char *cp; 2881 int count; 2882 int fd; 2883 2884 cp = strrchr(local, '/'); 2885 if (cp) 2886 *cp = '\0'; 2887 if (stat(cp ? local : ".", &st) < 0) { 2888 perror_reply(553, cp ? local : "."); 2889 return (-1); 2890 } 2891 if (cp) { 2892 /* 2893 * Let not overwrite dirname with counter suffix. 2894 * -4 is for /nn\0 2895 * In this extreme case dot won't be put in front of suffix. 2896 */ 2897 if (strlen(local) > sizeof(new) - 4) { 2898 reply(553, "Pathname too long"); 2899 return (-1); 2900 } 2901 *cp = '/'; 2902 } 2903 /* -4 is for the .nn<null> we put on the end below */ 2904 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2905 cp = new + strlen(new); 2906 /* 2907 * Don't generate dotfile unless requested explicitly. 2908 * This covers the case when basename gets truncated off 2909 * by buffer size. 2910 */ 2911 if (cp > new && cp[-1] != '/') 2912 *cp++ = '.'; 2913 for (count = 0; count < 100; count++) { 2914 /* At count 0 try unmodified name */ 2915 if (count) 2916 (void)sprintf(cp, "%d", count); 2917 if ((fd = open(count ? new : local, 2918 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2919 *name = count ? new : local; 2920 return (fd); 2921 } 2922 if (errno != EEXIST) { 2923 perror_reply(553, count ? new : local); 2924 return (-1); 2925 } 2926 } 2927 reply(452, "Unique file name cannot be created."); 2928 return (-1); 2929 } 2930 2931 /* 2932 * Format and send reply containing system error number. 2933 */ 2934 void 2935 perror_reply(int code, char *string) 2936 { 2937 2938 reply(code, "%s: %s.", string, strerror(errno)); 2939 } 2940 2941 static char *onefile[] = { 2942 "", 2943 0 2944 }; 2945 2946 void 2947 send_file_list(char *whichf) 2948 { 2949 struct stat st; 2950 DIR *dirp = NULL; 2951 struct dirent *dir; 2952 FILE *dout = NULL; 2953 char **dirlist, *dirname; 2954 int simple = 0; 2955 int freeglob = 0; 2956 glob_t gl; 2957 2958 if (strpbrk(whichf, "~{[*?") != NULL) { 2959 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2960 2961 memset(&gl, 0, sizeof(gl)); 2962 gl.gl_matchc = MAXGLOBARGS; 2963 flags |= GLOB_LIMIT; 2964 freeglob = 1; 2965 if (glob(whichf, flags, 0, &gl)) { 2966 reply(550, "not found"); 2967 goto out; 2968 } else if (gl.gl_pathc == 0) { 2969 errno = ENOENT; 2970 perror_reply(550, whichf); 2971 goto out; 2972 } 2973 dirlist = gl.gl_pathv; 2974 } else { 2975 onefile[0] = whichf; 2976 dirlist = onefile; 2977 simple = 1; 2978 } 2979 2980 while ((dirname = *dirlist++)) { 2981 if (stat(dirname, &st) < 0) { 2982 /* 2983 * If user typed "ls -l", etc, and the client 2984 * used NLST, do what the user meant. 2985 */ 2986 if (dirname[0] == '-' && *dirlist == NULL && 2987 transflag == 0) { 2988 retrieve(_PATH_LS " %s", dirname); 2989 goto out; 2990 } 2991 perror_reply(550, whichf); 2992 if (dout != NULL) { 2993 (void) fclose(dout); 2994 transflag = 0; 2995 data = -1; 2996 pdata = -1; 2997 } 2998 goto out; 2999 } 3000 3001 if (S_ISREG(st.st_mode)) { 3002 if (dout == NULL) { 3003 dout = dataconn("file list", (off_t)-1, "w"); 3004 if (dout == NULL) 3005 goto out; 3006 transflag++; 3007 } 3008 fprintf(dout, "%s%s\n", dirname, 3009 type == TYPE_A ? "\r" : ""); 3010 byte_count += strlen(dirname) + 1; 3011 continue; 3012 } else if (!S_ISDIR(st.st_mode)) 3013 continue; 3014 3015 if ((dirp = opendir(dirname)) == NULL) 3016 continue; 3017 3018 while ((dir = readdir(dirp)) != NULL) { 3019 char nbuf[MAXPATHLEN]; 3020 3021 if (recvurg) { 3022 myoob(); 3023 recvurg = 0; 3024 transflag = 0; 3025 goto out; 3026 } 3027 3028 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3029 continue; 3030 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3031 dir->d_namlen == 2) 3032 continue; 3033 3034 snprintf(nbuf, sizeof(nbuf), 3035 "%s/%s", dirname, dir->d_name); 3036 3037 /* 3038 * We have to do a stat to insure it's 3039 * not a directory or special file. 3040 */ 3041 if (simple || (stat(nbuf, &st) == 0 && 3042 S_ISREG(st.st_mode))) { 3043 if (dout == NULL) { 3044 dout = dataconn("file list", (off_t)-1, 3045 "w"); 3046 if (dout == NULL) 3047 goto out; 3048 transflag++; 3049 } 3050 if (nbuf[0] == '.' && nbuf[1] == '/') 3051 fprintf(dout, "%s%s\n", &nbuf[2], 3052 type == TYPE_A ? "\r" : ""); 3053 else 3054 fprintf(dout, "%s%s\n", nbuf, 3055 type == TYPE_A ? "\r" : ""); 3056 byte_count += strlen(nbuf) + 1; 3057 } 3058 } 3059 (void) closedir(dirp); 3060 } 3061 3062 if (dout == NULL) 3063 reply(550, "No files found."); 3064 else if (ferror(dout) != 0) 3065 perror_reply(550, "Data connection"); 3066 else 3067 reply(226, "Transfer complete."); 3068 3069 transflag = 0; 3070 if (dout != NULL) 3071 (void) fclose(dout); 3072 data = -1; 3073 pdata = -1; 3074 out: 3075 if (freeglob) { 3076 freeglob = 0; 3077 globfree(&gl); 3078 } 3079 } 3080 3081 void 3082 reapchild(int signo) 3083 { 3084 while (wait3(NULL, WNOHANG, NULL) > 0); 3085 } 3086 3087 #ifdef OLD_SETPROCTITLE 3088 /* 3089 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3090 * Warning, since this is usually started from inetd.conf, it often doesn't 3091 * have much of an environment or arglist to overwrite. 3092 */ 3093 void 3094 setproctitle(const char *fmt, ...) 3095 { 3096 int i; 3097 va_list ap; 3098 char *p, *bp, ch; 3099 char buf[LINE_MAX]; 3100 3101 va_start(ap, fmt); 3102 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3103 3104 /* make ps print our process name */ 3105 p = Argv[0]; 3106 *p++ = '-'; 3107 3108 i = strlen(buf); 3109 if (i > LastArgv - p - 2) { 3110 i = LastArgv - p - 2; 3111 buf[i] = '\0'; 3112 } 3113 bp = buf; 3114 while (ch = *bp++) 3115 if (ch != '\n' && ch != '\r') 3116 *p++ = ch; 3117 while (p < LastArgv) 3118 *p++ = ' '; 3119 } 3120 #endif /* OLD_SETPROCTITLE */ 3121 3122 static void 3123 logxfer(char *name, off_t size, time_t start) 3124 { 3125 char buf[1024]; 3126 char path[MAXPATHLEN + 1]; 3127 time_t now; 3128 3129 if (statfd >= 0 && getwd(path) != NULL) { 3130 time(&now); 3131 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n", 3132 ctime(&now)+4, ident, remotehost, 3133 path, name, (long long)size, 3134 (long)(now - start + (now == start))); 3135 write(statfd, buf, strlen(buf)); 3136 } 3137 } 3138 3139 static char * 3140 doublequote(char *s) 3141 { 3142 int n; 3143 char *p, *s2; 3144 3145 for (p = s, n = 0; *p; p++) 3146 if (*p == '"') 3147 n++; 3148 3149 if ((s2 = malloc(p - s + n + 1)) == NULL) 3150 return (NULL); 3151 3152 for (p = s2; *s; s++, p++) { 3153 if ((*p = *s) == '"') 3154 *(++p) = '"'; 3155 } 3156 *p = '\0'; 3157 3158 return (s2); 3159 } 3160