1 /* 2 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if 0 35 #ifndef lint 36 static char copyright[] = 37 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #endif /* not lint */ 40 #endif 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 45 #endif 46 static const char rcsid[] = 47 "$FreeBSD$"; 48 #endif /* not lint */ 49 50 /* 51 * FTP server. 52 */ 53 #include <sys/param.h> 54 #include <sys/ioctl.h> 55 #include <sys/mman.h> 56 #include <sys/socket.h> 57 #include <sys/stat.h> 58 #include <sys/time.h> 59 #include <sys/wait.h> 60 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/ip.h> 64 #include <netinet/tcp.h> 65 66 #define FTP_NAMES 67 #include <arpa/ftp.h> 68 #include <arpa/inet.h> 69 #include <arpa/telnet.h> 70 71 #include <ctype.h> 72 #include <dirent.h> 73 #include <err.h> 74 #include <errno.h> 75 #include <fcntl.h> 76 #include <glob.h> 77 #include <limits.h> 78 #include <netdb.h> 79 #include <pwd.h> 80 #include <grp.h> 81 #include <opie.h> 82 #include <signal.h> 83 #include <stdio.h> 84 #include <stdlib.h> 85 #include <string.h> 86 #include <syslog.h> 87 #include <time.h> 88 #include <unistd.h> 89 #include <libutil.h> 90 #ifdef LOGIN_CAP 91 #include <login_cap.h> 92 #endif 93 94 #ifdef USE_PAM 95 #include <security/pam_appl.h> 96 #endif 97 98 #include "pathnames.h" 99 #include "extern.h" 100 101 #include <stdarg.h> 102 103 static char version[] = "Version 6.00LS"; 104 #undef main 105 106 extern off_t restart_point; 107 extern char cbuf[]; 108 109 union sockunion ctrl_addr; 110 union sockunion data_source; 111 union sockunion data_dest; 112 union sockunion his_addr; 113 union sockunion pasv_addr; 114 115 int daemon_mode; 116 int data; 117 int dataport; 118 int hostinfo = 1; /* print host-specific info in messages */ 119 int logged_in; 120 struct passwd *pw; 121 char *homedir; 122 int ftpdebug; 123 int timeout = 900; /* timeout after 15 minutes of inactivity */ 124 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 125 int logging; 126 int restricted_data_ports = 1; 127 int paranoid = 1; /* be extra careful about security */ 128 int anon_only = 0; /* Only anonymous ftp allowed */ 129 int guest; 130 int dochroot; 131 int dowtmp = 1; 132 int stats; 133 int statfd = -1; 134 int type; 135 int form; 136 int stru; /* avoid C keyword */ 137 int mode; 138 int usedefault = 1; /* for data transfers */ 139 int pdata = -1; /* for passive mode */ 140 int readonly=0; /* Server is in readonly mode. */ 141 int noepsv=0; /* EPSV command is disabled. */ 142 int noretr=0; /* RETR command is disabled. */ 143 int noguestretr=0; /* RETR command is disabled for anon users. */ 144 int noguestmkd=0; /* MKD command is disabled for anon users. */ 145 int noguestmod=1; /* anon users may not modify existing files. */ 146 147 static volatile sig_atomic_t recvurg; 148 sig_atomic_t transflag; 149 off_t file_size; 150 off_t byte_count; 151 #if !defined(CMASK) || CMASK == 0 152 #undef CMASK 153 #define CMASK 027 154 #endif 155 int defumask = CMASK; /* default umask value */ 156 char tmpline[7]; 157 char *hostname; 158 int epsvall = 0; 159 160 #ifdef VIRTUAL_HOSTING 161 char *ftpuser; 162 163 static struct ftphost { 164 struct ftphost *next; 165 struct addrinfo *hostinfo; 166 char *hostname; 167 char *anonuser; 168 char *statfile; 169 char *welcome; 170 char *loginmsg; 171 } *thishost, *firsthost; 172 173 #endif 174 char remotehost[MAXHOSTNAMELEN]; 175 char *ident = NULL; 176 177 static char ttyline[20]; 178 char *tty = ttyline; /* for klogin */ 179 180 #ifdef USE_PAM 181 static int auth_pam(struct passwd**, const char*); 182 pam_handle_t *pamh = NULL; 183 #endif 184 185 static struct opie opiedata; 186 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 187 static int pwok; 188 189 char *pid_file = NULL; 190 191 /* 192 * Limit number of pathnames that glob can return. 193 * A limit of 0 indicates the number of pathnames is unlimited. 194 */ 195 #define MAXGLOBARGS 16384 196 # 197 198 /* 199 * Timeout intervals for retrying connections 200 * to hosts that don't accept PORT cmds. This 201 * is a kludge, but given the problems with TCP... 202 */ 203 #define SWAITMAX 90 /* wait at most 90 seconds */ 204 #define SWAITINT 5 /* interval between retries */ 205 206 int swaitmax = SWAITMAX; 207 int swaitint = SWAITINT; 208 209 #ifdef SETPROCTITLE 210 #ifdef OLD_SETPROCTITLE 211 char **Argv = NULL; /* pointer to argument vector */ 212 char *LastArgv = NULL; /* end of argv */ 213 #endif /* OLD_SETPROCTITLE */ 214 char proctitle[LINE_MAX]; /* initial part of title */ 215 #endif /* SETPROCTITLE */ 216 217 #define LOGCMD(cmd, file) \ 218 if (logging > 1) \ 219 syslog(LOG_INFO,"%s %s%s", cmd, \ 220 *(file) == '/' ? "" : curdir(), file); 221 #define LOGCMD2(cmd, file1, file2) \ 222 if (logging > 1) \ 223 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 224 *(file1) == '/' ? "" : curdir(), file1, \ 225 *(file2) == '/' ? "" : curdir(), file2); 226 #define LOGBYTES(cmd, file, cnt) \ 227 if (logging > 1) { \ 228 if (cnt == (off_t)-1) \ 229 syslog(LOG_INFO,"%s %s%s", cmd, \ 230 *(file) == '/' ? "" : curdir(), file); \ 231 else \ 232 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 233 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 234 } 235 236 #ifdef VIRTUAL_HOSTING 237 static void inithosts(void); 238 static void selecthost(union sockunion *); 239 #endif 240 static void ack(char *); 241 static void sigurg(int); 242 static void myoob(void); 243 static int checkuser(char *, char *, int, char **); 244 static FILE *dataconn(char *, off_t, char *); 245 static void dolog(struct sockaddr *); 246 static char *curdir(void); 247 static void end_login(void); 248 static FILE *getdatasock(char *); 249 static int guniquefd(char *, char **); 250 static void lostconn(int); 251 static void sigquit(int); 252 static int receive_data(FILE *, FILE *); 253 static int send_data(FILE *, FILE *, off_t, off_t, int); 254 static struct passwd * 255 sgetpwnam(char *); 256 static char *sgetsave(char *); 257 static void reapchild(int); 258 static void logxfer(char *, off_t, time_t); 259 static char *doublequote(char *); 260 static int *socksetup(int, char *, const char *); 261 262 static char * 263 curdir(void) 264 { 265 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 266 267 if (getcwd(path, sizeof(path)-2) == NULL) 268 return (""); 269 if (path[1] != '\0') /* special case for root dir. */ 270 strcat(path, "/"); 271 /* For guest account, skip / since it's chrooted */ 272 return (guest ? path+1 : path); 273 } 274 275 int 276 main(int argc, char *argv[], char **envp) 277 { 278 int addrlen, ch, on = 1, tos; 279 char *cp, line[LINE_MAX]; 280 FILE *fd; 281 int error; 282 char *bindname = NULL; 283 const char *bindport = "ftp"; 284 int family = AF_UNSPEC; 285 struct sigaction sa; 286 287 tzset(); /* in case no timezone database in ~ftp */ 288 sigemptyset(&sa.sa_mask); 289 sa.sa_flags = SA_RESTART; 290 291 #ifdef OLD_SETPROCTITLE 292 /* 293 * Save start and extent of argv for setproctitle. 294 */ 295 Argv = argv; 296 while (*envp) 297 envp++; 298 LastArgv = envp[-1] + strlen(envp[-1]); 299 #endif /* OLD_SETPROCTITLE */ 300 301 302 while ((ch = getopt(argc, argv, 303 "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 304 switch (ch) { 305 case '4': 306 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 307 break; 308 309 case '6': 310 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 311 break; 312 313 case 'a': 314 bindname = optarg; 315 break; 316 317 case 'A': 318 anon_only = 1; 319 break; 320 321 case 'd': 322 ftpdebug++; 323 break; 324 325 case 'D': 326 daemon_mode++; 327 break; 328 329 case 'E': 330 noepsv = 1; 331 break; 332 333 case 'h': 334 hostinfo = 0; 335 break; 336 337 case 'l': 338 logging++; /* > 1 == extra logging */ 339 break; 340 341 case 'm': 342 noguestmod = 0; 343 break; 344 345 case 'M': 346 noguestmkd = 1; 347 break; 348 349 case 'o': 350 noretr = 1; 351 break; 352 353 case 'O': 354 noguestretr = 1; 355 break; 356 357 case 'p': 358 pid_file = optarg; 359 break; 360 361 case 'P': 362 bindport = optarg; 363 break; 364 365 case 'r': 366 readonly = 1; 367 break; 368 369 case 'R': 370 paranoid = 0; 371 break; 372 373 case 'S': 374 stats++; 375 break; 376 377 case 't': 378 timeout = atoi(optarg); 379 if (maxtimeout < timeout) 380 maxtimeout = timeout; 381 break; 382 383 case 'T': 384 maxtimeout = atoi(optarg); 385 if (timeout > maxtimeout) 386 timeout = maxtimeout; 387 break; 388 389 case 'u': 390 { 391 long val = 0; 392 393 val = strtol(optarg, &optarg, 8); 394 if (*optarg != '\0' || val < 0) 395 warnx("bad value for -u"); 396 else 397 defumask = val; 398 break; 399 } 400 case 'U': 401 restricted_data_ports = 0; 402 break; 403 404 case 'v': 405 ftpdebug++; 406 break; 407 408 case 'W': 409 dowtmp = 0; 410 break; 411 412 default: 413 warnx("unknown flag -%c ignored", optopt); 414 break; 415 } 416 } 417 418 #ifdef VIRTUAL_HOSTING 419 inithosts(); 420 #endif 421 (void) freopen(_PATH_DEVNULL, "w", stderr); 422 423 /* 424 * LOG_NDELAY sets up the logging connection immediately, 425 * necessary for anonymous ftp's that chroot and can't do it later. 426 */ 427 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 428 429 if (daemon_mode) { 430 int *ctl_sock, fd, maxfd = -1, nfds, i; 431 fd_set defreadfds, readfds; 432 pid_t pid; 433 434 /* 435 * Detach from parent. 436 */ 437 if (daemon(1, 1) < 0) { 438 syslog(LOG_ERR, "failed to become a daemon"); 439 exit(1); 440 } 441 sa.sa_handler = reapchild; 442 (void)sigaction(SIGCHLD, &sa, NULL); 443 444 /* 445 * Open a socket, bind it to the FTP port, and start 446 * listening. 447 */ 448 ctl_sock = socksetup(family, bindname, bindport); 449 if (ctl_sock == NULL) 450 exit(1); 451 452 FD_ZERO(&defreadfds); 453 for (i = 1; i <= *ctl_sock; i++) { 454 FD_SET(ctl_sock[i], &defreadfds); 455 if (listen(ctl_sock[i], 32) < 0) { 456 syslog(LOG_ERR, "control listen: %m"); 457 exit(1); 458 } 459 if (maxfd < ctl_sock[i]) 460 maxfd = ctl_sock[i]; 461 } 462 463 /* 464 * Atomically write process ID 465 */ 466 if (pid_file) 467 { 468 int fd; 469 char buf[20]; 470 471 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 472 | O_NONBLOCK | O_EXLOCK, 0644); 473 if (fd < 0) { 474 if (errno == EAGAIN) 475 errx(1, "%s: file locked", pid_file); 476 else 477 err(1, "%s", pid_file); 478 } 479 snprintf(buf, sizeof(buf), 480 "%lu\n", (unsigned long) getpid()); 481 if (write(fd, buf, strlen(buf)) < 0) 482 err(1, "%s: write", pid_file); 483 /* Leave the pid file open and locked */ 484 } 485 /* 486 * Loop forever accepting connection requests and forking off 487 * children to handle them. 488 */ 489 while (1) { 490 FD_COPY(&defreadfds, &readfds); 491 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 492 if (nfds <= 0) { 493 if (nfds < 0 && errno != EINTR) 494 syslog(LOG_WARNING, "select: %m"); 495 continue; 496 } 497 498 pid = -1; 499 for (i = 1; i <= *ctl_sock; i++) 500 if (FD_ISSET(ctl_sock[i], &readfds)) { 501 addrlen = sizeof(his_addr); 502 fd = accept(ctl_sock[i], 503 (struct sockaddr *)&his_addr, 504 &addrlen); 505 if ((pid = fork()) == 0) { 506 /* child */ 507 (void) dup2(fd, 0); 508 (void) dup2(fd, 1); 509 close(ctl_sock[i]); 510 } else 511 close(fd); 512 } 513 if (pid == 0) 514 break; 515 } 516 } else { 517 addrlen = sizeof(his_addr); 518 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 519 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 520 exit(1); 521 } 522 } 523 524 sa.sa_handler = SIG_DFL; 525 (void)sigaction(SIGCHLD, &sa, NULL); 526 527 sa.sa_handler = sigurg; 528 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 529 (void)sigaction(SIGURG, &sa, NULL); 530 531 sigfillset(&sa.sa_mask); /* block all signals in handler */ 532 sa.sa_flags = SA_RESTART; 533 sa.sa_handler = sigquit; 534 (void)sigaction(SIGHUP, &sa, NULL); 535 (void)sigaction(SIGINT, &sa, NULL); 536 (void)sigaction(SIGQUIT, &sa, NULL); 537 (void)sigaction(SIGTERM, &sa, NULL); 538 539 sa.sa_handler = lostconn; 540 (void)sigaction(SIGPIPE, &sa, NULL); 541 542 addrlen = sizeof(ctrl_addr); 543 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 544 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 545 exit(1); 546 } 547 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 548 #ifdef VIRTUAL_HOSTING 549 /* select our identity from virtual host table */ 550 selecthost(&ctrl_addr); 551 #endif 552 #ifdef IP_TOS 553 if (ctrl_addr.su_family == AF_INET) 554 { 555 tos = IPTOS_LOWDELAY; 556 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 557 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 558 } 559 #endif 560 /* 561 * Disable Nagle on the control channel so that we don't have to wait 562 * for peer's ACK before issuing our next reply. 563 */ 564 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 565 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 566 567 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 568 569 /* set this here so klogin can use it... */ 570 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 571 572 /* Try to handle urgent data inline */ 573 #ifdef SO_OOBINLINE 574 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 575 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 576 #endif 577 578 #ifdef F_SETOWN 579 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 580 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 581 #endif 582 dolog((struct sockaddr *)&his_addr); 583 /* 584 * Set up default state 585 */ 586 data = -1; 587 type = TYPE_A; 588 form = FORM_N; 589 stru = STRU_F; 590 mode = MODE_S; 591 tmpline[0] = '\0'; 592 593 /* If logins are disabled, print out the message. */ 594 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 595 while (fgets(line, sizeof(line), fd) != NULL) { 596 if ((cp = strchr(line, '\n')) != NULL) 597 *cp = '\0'; 598 lreply(530, "%s", line); 599 } 600 (void) fflush(stdout); 601 (void) fclose(fd); 602 reply(530, "System not available."); 603 exit(0); 604 } 605 #ifdef VIRTUAL_HOSTING 606 if ((fd = fopen(thishost->welcome, "r")) != NULL) { 607 #else 608 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 609 #endif 610 while (fgets(line, sizeof(line), fd) != NULL) { 611 if ((cp = strchr(line, '\n')) != NULL) 612 *cp = '\0'; 613 lreply(220, "%s", line); 614 } 615 (void) fflush(stdout); 616 (void) fclose(fd); 617 /* reply(220,) must follow */ 618 } 619 #ifndef VIRTUAL_HOSTING 620 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 621 fatalerror("Ran out of memory."); 622 (void) gethostname(hostname, MAXHOSTNAMELEN - 1); 623 hostname[MAXHOSTNAMELEN - 1] = '\0'; 624 #endif 625 if (hostinfo) 626 reply(220, "%s FTP server (%s) ready.", hostname, version); 627 else 628 reply(220, "FTP server ready."); 629 for (;;) 630 (void) yyparse(); 631 /* NOTREACHED */ 632 } 633 634 static void 635 lostconn(int signo) 636 { 637 638 if (ftpdebug) 639 syslog(LOG_DEBUG, "lost connection"); 640 dologout(1); 641 } 642 643 static void 644 sigquit(int signo) 645 { 646 647 syslog(LOG_ERR, "got signal %d", signo); 648 dologout(1); 649 } 650 651 #ifdef VIRTUAL_HOSTING 652 /* 653 * read in virtual host tables (if they exist) 654 */ 655 656 static void 657 inithosts(void) 658 { 659 int insert; 660 size_t len; 661 FILE *fp; 662 char *cp, *mp, *line; 663 char *hostname; 664 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 665 struct ftphost *hrp, *lhrp; 666 struct addrinfo hints, *res, *ai; 667 668 /* 669 * Fill in the default host information 670 */ 671 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 672 fatalerror("Ran out of memory."); 673 if (gethostname(hostname, MAXHOSTNAMELEN) < 0) 674 hostname[0] = '\0'; 675 hostname[MAXHOSTNAMELEN - 1] = '\0'; 676 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 677 fatalerror("Ran out of memory."); 678 hrp->hostname = hostname; 679 hrp->hostinfo = NULL; 680 681 memset(&hints, 0, sizeof(hints)); 682 hints.ai_flags = AI_CANONNAME; 683 hints.ai_family = AF_UNSPEC; 684 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 685 hrp->hostinfo = res; 686 hrp->statfile = _PATH_FTPDSTATFILE; 687 hrp->welcome = _PATH_FTPWELCOME; 688 hrp->loginmsg = _PATH_FTPLOGINMESG; 689 hrp->anonuser = "ftp"; 690 hrp->next = NULL; 691 thishost = firsthost = lhrp = hrp; 692 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 693 int addrsize, gothost; 694 void *addr; 695 struct hostent *hp; 696 697 while ((line = fgetln(fp, &len)) != NULL) { 698 int i, hp_error; 699 700 /* skip comments */ 701 if (line[0] == '#') 702 continue; 703 if (line[len - 1] == '\n') { 704 line[len - 1] = '\0'; 705 mp = NULL; 706 } else { 707 if ((mp = malloc(len + 1)) == NULL) 708 fatalerror("Ran out of memory."); 709 memcpy(mp, line, len); 710 mp[len] = '\0'; 711 line = mp; 712 } 713 cp = strtok(line, " \t"); 714 /* skip empty lines */ 715 if (cp == NULL) 716 goto nextline; 717 vhost = cp; 718 719 /* set defaults */ 720 anonuser = "ftp"; 721 statfile = _PATH_FTPDSTATFILE; 722 welcome = _PATH_FTPWELCOME; 723 loginmsg = _PATH_FTPLOGINMESG; 724 725 /* 726 * Preparse the line so we can use its info 727 * for all the addresses associated with 728 * the virtual host name. 729 * Field 0, the virtual host name, is special: 730 * it's already parsed off and will be strdup'ed 731 * later, after we know its canonical form. 732 */ 733 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 734 if (*cp != '-' && (cp = strdup(cp))) 735 switch (i) { 736 case 1: /* anon user permissions */ 737 anonuser = cp; 738 break; 739 case 2: /* statistics file */ 740 statfile = cp; 741 break; 742 case 3: /* welcome message */ 743 welcome = cp; 744 break; 745 case 4: /* login message */ 746 loginmsg = cp; 747 break; 748 default: /* programming error */ 749 abort(); 750 /* NOTREACHED */ 751 } 752 753 hints.ai_flags = 0; 754 hints.ai_family = AF_UNSPEC; 755 hints.ai_flags = AI_PASSIVE; 756 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 757 goto nextline; 758 for (ai = res; ai != NULL && ai->ai_addr != NULL; 759 ai = ai->ai_next) { 760 761 gothost = 0; 762 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 763 struct addrinfo *hi; 764 765 for (hi = hrp->hostinfo; hi != NULL; 766 hi = hi->ai_next) 767 if (hi->ai_addrlen == ai->ai_addrlen && 768 memcmp(hi->ai_addr, 769 ai->ai_addr, 770 ai->ai_addr->sa_len) == 0) { 771 gothost++; 772 break; 773 } 774 if (gothost) 775 break; 776 } 777 if (hrp == NULL) { 778 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 779 goto nextline; 780 hrp->hostname = NULL; 781 insert = 1; 782 } else { 783 if (hrp->hostinfo && hrp->hostinfo != res) 784 freeaddrinfo(hrp->hostinfo); 785 insert = 0; /* host already in the chain */ 786 } 787 hrp->hostinfo = res; 788 789 /* 790 * determine hostname to use. 791 * force defined name if there is a valid alias 792 * otherwise fallback to primary hostname 793 */ 794 /* XXX: getaddrinfo() can't do alias check */ 795 switch(hrp->hostinfo->ai_family) { 796 case AF_INET: 797 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 798 addrsize = sizeof(struct in_addr); 799 break; 800 case AF_INET6: 801 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 802 addrsize = sizeof(struct in6_addr); 803 break; 804 default: 805 /* should not reach here */ 806 freeaddrinfo(hrp->hostinfo); 807 if (insert) 808 free(hrp); /*not in chain, can free*/ 809 else 810 hrp->hostinfo = NULL; /*mark as blank*/ 811 goto nextline; 812 /* NOTREACHED */ 813 } 814 if ((hp = getipnodebyaddr(addr, addrsize, 815 hrp->hostinfo->ai_family, 816 &hp_error)) != NULL) { 817 if (strcmp(vhost, hp->h_name) != 0) { 818 if (hp->h_aliases == NULL) 819 vhost = hp->h_name; 820 else { 821 i = 0; 822 while (hp->h_aliases[i] && 823 strcmp(vhost, hp->h_aliases[i]) != 0) 824 ++i; 825 if (hp->h_aliases[i] == NULL) 826 vhost = hp->h_name; 827 } 828 } 829 } 830 if (hrp->hostname && 831 strcmp(hrp->hostname, vhost) != 0) { 832 free(hrp->hostname); 833 hrp->hostname = NULL; 834 } 835 if (hrp->hostname == NULL && 836 (hrp->hostname = strdup(vhost)) == NULL) { 837 freeaddrinfo(hrp->hostinfo); 838 hrp->hostinfo = NULL; /* mark as blank */ 839 if (hp) 840 freehostent(hp); 841 goto nextline; 842 } 843 hrp->anonuser = anonuser; 844 hrp->statfile = statfile; 845 hrp->welcome = welcome; 846 hrp->loginmsg = loginmsg; 847 if (insert) { 848 hrp->next = NULL; 849 lhrp->next = hrp; 850 lhrp = hrp; 851 } 852 if (hp) 853 freehostent(hp); 854 } 855 nextline: 856 if (mp) 857 free(mp); 858 } 859 (void) fclose(fp); 860 } 861 } 862 863 static void 864 selecthost(union sockunion *su) 865 { 866 struct ftphost *hrp; 867 u_int16_t port; 868 #ifdef INET6 869 struct in6_addr *mapped_in6 = NULL; 870 #endif 871 struct addrinfo *hi; 872 873 #ifdef INET6 874 /* 875 * XXX IPv4 mapped IPv6 addr consideraton, 876 * specified in rfc2373. 877 */ 878 if (su->su_family == AF_INET6 && 879 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 880 mapped_in6 = &su->su_sin6.sin6_addr; 881 #endif 882 883 hrp = thishost = firsthost; /* default */ 884 port = su->su_port; 885 su->su_port = 0; 886 while (hrp != NULL) { 887 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 888 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 889 thishost = hrp; 890 break; 891 } 892 #ifdef INET6 893 /* XXX IPv4 mapped IPv6 addr consideraton */ 894 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 895 (memcmp(&mapped_in6->s6_addr[12], 896 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 897 sizeof(struct in_addr)) == 0)) { 898 thishost = hrp; 899 break; 900 } 901 #endif 902 } 903 hrp = hrp->next; 904 } 905 su->su_port = port; 906 /* setup static variables as appropriate */ 907 hostname = thishost->hostname; 908 ftpuser = thishost->anonuser; 909 } 910 #endif 911 912 /* 913 * Helper function for sgetpwnam(). 914 */ 915 static char * 916 sgetsave(char *s) 917 { 918 char *new = malloc((unsigned) strlen(s) + 1); 919 920 if (new == NULL) { 921 perror_reply(421, "Local resource failure: malloc"); 922 dologout(1); 923 /* NOTREACHED */ 924 } 925 (void) strcpy(new, s); 926 return (new); 927 } 928 929 /* 930 * Save the result of a getpwnam. Used for USER command, since 931 * the data returned must not be clobbered by any other command 932 * (e.g., globbing). 933 */ 934 static struct passwd * 935 sgetpwnam(char *name) 936 { 937 static struct passwd save; 938 struct passwd *p; 939 940 if ((p = getpwnam(name)) == NULL) 941 return (p); 942 if (save.pw_name) { 943 free(save.pw_name); 944 free(save.pw_passwd); 945 free(save.pw_gecos); 946 free(save.pw_dir); 947 free(save.pw_shell); 948 } 949 save = *p; 950 save.pw_name = sgetsave(p->pw_name); 951 save.pw_passwd = sgetsave(p->pw_passwd); 952 save.pw_gecos = sgetsave(p->pw_gecos); 953 save.pw_dir = sgetsave(p->pw_dir); 954 save.pw_shell = sgetsave(p->pw_shell); 955 return (&save); 956 } 957 958 static int login_attempts; /* number of failed login attempts */ 959 static int askpasswd; /* had user command, ask for passwd */ 960 static char curname[MAXLOGNAME]; /* current USER name */ 961 962 /* 963 * USER command. 964 * Sets global passwd pointer pw if named account exists and is acceptable; 965 * sets askpasswd if a PASS command is expected. If logged in previously, 966 * need to reset state. If name is "ftp" or "anonymous", the name is not in 967 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 968 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 969 * requesting login privileges. Disallow anyone who does not have a standard 970 * shell as returned by getusershell(). Disallow anyone mentioned in the file 971 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 972 */ 973 void 974 user(char *name) 975 { 976 char *cp, *shell; 977 978 if (logged_in) { 979 if (guest) { 980 reply(530, "Can't change user from guest login."); 981 return; 982 } else if (dochroot) { 983 reply(530, "Can't change user from chroot user."); 984 return; 985 } 986 end_login(); 987 } 988 989 guest = 0; 990 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 991 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 992 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 993 reply(530, "User %s access denied.", name); 994 #ifdef VIRTUAL_HOSTING 995 else if ((pw = sgetpwnam(thishost->anonuser)) != NULL) { 996 #else 997 else if ((pw = sgetpwnam("ftp")) != NULL) { 998 #endif 999 guest = 1; 1000 askpasswd = 1; 1001 reply(331, 1002 "Guest login ok, send your email address as password."); 1003 } else 1004 reply(530, "User %s unknown.", name); 1005 if (!askpasswd && logging) 1006 syslog(LOG_NOTICE, 1007 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1008 return; 1009 } 1010 if (anon_only != 0) { 1011 reply(530, "Sorry, only anonymous ftp allowed."); 1012 return; 1013 } 1014 1015 if ((pw = sgetpwnam(name))) { 1016 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1017 shell = _PATH_BSHELL; 1018 setusershell(); 1019 while ((cp = getusershell()) != NULL) 1020 if (strcmp(cp, shell) == 0) 1021 break; 1022 endusershell(); 1023 1024 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1025 reply(530, "User %s access denied.", name); 1026 if (logging) 1027 syslog(LOG_NOTICE, 1028 "FTP LOGIN REFUSED FROM %s, %s", 1029 remotehost, name); 1030 pw = (struct passwd *) NULL; 1031 return; 1032 } 1033 } 1034 if (logging) 1035 strncpy(curname, name, sizeof(curname)-1); 1036 1037 pwok = 0; 1038 #ifdef USE_PAM 1039 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1040 #endif 1041 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1042 pwok = (pw != NULL) && 1043 opieaccessfile(remotehost) && 1044 opiealways(pw->pw_dir); 1045 reply(331, "Response to %s %s for %s.", 1046 opieprompt, pwok ? "requested" : "required", name); 1047 } else { 1048 pwok = 1; 1049 reply(331, "Password required for %s.", name); 1050 } 1051 askpasswd = 1; 1052 /* 1053 * Delay before reading passwd after first failed 1054 * attempt to slow down passwd-guessing programs. 1055 */ 1056 if (login_attempts) 1057 sleep((unsigned) login_attempts); 1058 } 1059 1060 /* 1061 * Check if a user is in the file "fname", 1062 * return a pointer to a malloc'd string with the rest 1063 * of the matching line in "residue" if not NULL. 1064 */ 1065 static int 1066 checkuser(char *fname, char *name, int pwset, char **residue) 1067 { 1068 FILE *fd; 1069 int found = 0; 1070 size_t len; 1071 char *line, *mp, *p; 1072 1073 if ((fd = fopen(fname, "r")) != NULL) { 1074 while (!found && (line = fgetln(fd, &len)) != NULL) { 1075 /* skip comments */ 1076 if (line[0] == '#') 1077 continue; 1078 if (line[len - 1] == '\n') { 1079 line[len - 1] = '\0'; 1080 mp = NULL; 1081 } else { 1082 if ((mp = malloc(len + 1)) == NULL) 1083 fatalerror("Ran out of memory."); 1084 memcpy(mp, line, len); 1085 mp[len] = '\0'; 1086 line = mp; 1087 } 1088 /* avoid possible leading and trailing whitespace */ 1089 p = strtok(line, " \t"); 1090 /* skip empty lines */ 1091 if (p == NULL) 1092 goto nextline; 1093 /* 1094 * if first chr is '@', check group membership 1095 */ 1096 if (p[0] == '@') { 1097 int i = 0; 1098 struct group *grp; 1099 1100 if (p[1] == '\0') /* single @ matches anyone */ 1101 found = 1; 1102 else { 1103 if ((grp = getgrnam(p+1)) == NULL) 1104 goto nextline; 1105 /* 1106 * Check user's default group 1107 */ 1108 if (pwset && grp->gr_gid == pw->pw_gid) 1109 found = 1; 1110 /* 1111 * Check supplementary groups 1112 */ 1113 while (!found && grp->gr_mem[i]) 1114 found = strcmp(name, 1115 grp->gr_mem[i++]) 1116 == 0; 1117 } 1118 } 1119 /* 1120 * Otherwise, just check for username match 1121 */ 1122 else 1123 found = strcmp(p, name) == 0; 1124 /* 1125 * Save the rest of line to "residue" if matched 1126 */ 1127 if (found && residue) { 1128 if ((p = strtok(NULL, "")) != NULL) 1129 p += strspn(p, " \t"); 1130 if (p && *p) { 1131 if ((*residue = strdup(p)) == NULL) 1132 fatalerror("Ran out of memory."); 1133 } else 1134 *residue = NULL; 1135 } 1136 nextline: 1137 if (mp) 1138 free(mp); 1139 } 1140 (void) fclose(fd); 1141 } 1142 return (found); 1143 } 1144 1145 /* 1146 * Terminate login as previous user, if any, resetting state; 1147 * used when USER command is given or login fails. 1148 */ 1149 static void 1150 end_login(void) 1151 { 1152 #ifdef USE_PAM 1153 int e; 1154 #endif 1155 1156 (void) seteuid((uid_t)0); 1157 if (logged_in && dowtmp) 1158 ftpd_logwtmp(ttyline, "", NULL); 1159 pw = NULL; 1160 #ifdef LOGIN_CAP 1161 setusercontext(NULL, getpwuid(0), (uid_t)0, 1162 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK| 1163 LOGIN_SETMAC); 1164 #endif 1165 #ifdef USE_PAM 1166 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1167 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1168 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1169 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1170 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1171 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1172 pamh = NULL; 1173 #endif 1174 logged_in = 0; 1175 guest = 0; 1176 dochroot = 0; 1177 } 1178 1179 #ifdef USE_PAM 1180 1181 /* 1182 * the following code is stolen from imap-uw PAM authentication module and 1183 * login.c 1184 */ 1185 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1186 1187 struct cred_t { 1188 const char *uname; /* user name */ 1189 const char *pass; /* password */ 1190 }; 1191 typedef struct cred_t cred_t; 1192 1193 static int 1194 auth_conv(int num_msg, const struct pam_message **msg, 1195 struct pam_response **resp, void *appdata) 1196 { 1197 int i; 1198 cred_t *cred = (cred_t *) appdata; 1199 struct pam_response *reply; 1200 1201 reply = calloc(num_msg, sizeof *reply); 1202 if (reply == NULL) 1203 return PAM_BUF_ERR; 1204 1205 for (i = 0; i < num_msg; i++) { 1206 switch (msg[i]->msg_style) { 1207 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1208 reply[i].resp_retcode = PAM_SUCCESS; 1209 reply[i].resp = COPY_STRING(cred->uname); 1210 /* PAM frees resp. */ 1211 break; 1212 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1213 reply[i].resp_retcode = PAM_SUCCESS; 1214 reply[i].resp = COPY_STRING(cred->pass); 1215 /* PAM frees resp. */ 1216 break; 1217 case PAM_TEXT_INFO: 1218 case PAM_ERROR_MSG: 1219 reply[i].resp_retcode = PAM_SUCCESS; 1220 reply[i].resp = NULL; 1221 break; 1222 default: /* unknown message style */ 1223 free(reply); 1224 return PAM_CONV_ERR; 1225 } 1226 } 1227 1228 *resp = reply; 1229 return PAM_SUCCESS; 1230 } 1231 1232 /* 1233 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1234 * authenticated, or 1 if not authenticated. If some sort of PAM system 1235 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1236 * function returns -1. This can be used as an indication that we should 1237 * fall back to a different authentication mechanism. 1238 */ 1239 static int 1240 auth_pam(struct passwd **ppw, const char *pass) 1241 { 1242 pam_handle_t *pamh = NULL; 1243 const char *tmpl_user; 1244 const void *item; 1245 int rval; 1246 int e; 1247 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1248 struct pam_conv conv = { &auth_conv, &auth_cred }; 1249 1250 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1251 if (e != PAM_SUCCESS) { 1252 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e)); 1253 return -1; 1254 } 1255 1256 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1257 if (e != PAM_SUCCESS) { 1258 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1259 pam_strerror(pamh, e)); 1260 return -1; 1261 } 1262 1263 e = pam_authenticate(pamh, 0); 1264 switch (e) { 1265 case PAM_SUCCESS: 1266 /* 1267 * With PAM we support the concept of a "template" 1268 * user. The user enters a login name which is 1269 * authenticated by PAM, usually via a remote service 1270 * such as RADIUS or TACACS+. If authentication 1271 * succeeds, a different but related "template" name 1272 * is used for setting the credentials, shell, and 1273 * home directory. The name the user enters need only 1274 * exist on the remote authentication server, but the 1275 * template name must be present in the local password 1276 * database. 1277 * 1278 * This is supported by two various mechanisms in the 1279 * individual modules. However, from the application's 1280 * point of view, the template user is always passed 1281 * back as a changed value of the PAM_USER item. 1282 */ 1283 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1284 PAM_SUCCESS) { 1285 tmpl_user = (const char *) item; 1286 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1287 *ppw = getpwnam(tmpl_user); 1288 } else 1289 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1290 pam_strerror(pamh, e)); 1291 rval = 0; 1292 break; 1293 1294 case PAM_AUTH_ERR: 1295 case PAM_USER_UNKNOWN: 1296 case PAM_MAXTRIES: 1297 rval = 1; 1298 break; 1299 1300 default: 1301 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1302 rval = -1; 1303 break; 1304 } 1305 1306 if (rval == 0) { 1307 e = pam_acct_mgmt(pamh, 0); 1308 if (e == PAM_NEW_AUTHTOK_REQD) { 1309 e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); 1310 if (e != PAM_SUCCESS) { 1311 syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); 1312 rval = 1; 1313 } 1314 } else if (e != PAM_SUCCESS) { 1315 rval = 1; 1316 } 1317 } 1318 1319 if (rval != 0) { 1320 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1321 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1322 } 1323 pamh = NULL; 1324 } 1325 return rval; 1326 } 1327 1328 #endif /* USE_PAM */ 1329 1330 void 1331 pass(char *passwd) 1332 { 1333 int rval; 1334 FILE *fd; 1335 #ifdef LOGIN_CAP 1336 login_cap_t *lc = NULL; 1337 #endif 1338 #ifdef USE_PAM 1339 int e; 1340 #endif 1341 char *chrootdir; 1342 char *residue = NULL; 1343 char *xpasswd; 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 #ifdef USE_PAM 1356 rval = auth_pam(&pw, passwd); 1357 if (rval >= 0) { 1358 opieunlock(); 1359 goto skip; 1360 } 1361 #endif 1362 if (opieverify(&opiedata, passwd) == 0) 1363 xpasswd = pw->pw_passwd; 1364 else if (pwok) { 1365 xpasswd = crypt(passwd, pw->pw_passwd); 1366 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1367 xpasswd = ":"; 1368 } else { 1369 rval = 1; 1370 goto skip; 1371 } 1372 rval = strcmp(pw->pw_passwd, xpasswd); 1373 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1374 rval = 1; /* failure */ 1375 skip: 1376 /* 1377 * If rval == 1, the user failed the authentication check 1378 * above. If rval == 0, either PAM or local authentication 1379 * succeeded. 1380 */ 1381 if (rval) { 1382 reply(530, "Login incorrect."); 1383 if (logging) { 1384 syslog(LOG_NOTICE, 1385 "FTP LOGIN FAILED FROM %s", 1386 remotehost); 1387 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1388 "FTP LOGIN FAILED FROM %s, %s", 1389 remotehost, curname); 1390 } 1391 pw = NULL; 1392 if (login_attempts++ >= 5) { 1393 syslog(LOG_NOTICE, 1394 "repeated login failures from %s", 1395 remotehost); 1396 exit(0); 1397 } 1398 return; 1399 } 1400 } 1401 login_attempts = 0; /* this time successful */ 1402 if (setegid((gid_t)pw->pw_gid) < 0) { 1403 reply(550, "Can't set gid."); 1404 return; 1405 } 1406 /* May be overridden by login.conf */ 1407 (void) umask(defumask); 1408 #ifdef LOGIN_CAP 1409 if ((lc = login_getpwclass(pw)) != NULL) { 1410 char remote_ip[MAXHOSTNAMELEN]; 1411 1412 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1413 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1414 NI_NUMERICHOST); 1415 remote_ip[sizeof(remote_ip) - 1] = 0; 1416 if (!auth_hostok(lc, remotehost, remote_ip)) { 1417 syslog(LOG_INFO|LOG_AUTH, 1418 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1419 pw->pw_name); 1420 reply(530, "Permission denied.\n"); 1421 pw = NULL; 1422 return; 1423 } 1424 if (!auth_timeok(lc, time(NULL))) { 1425 reply(530, "Login not available right now.\n"); 1426 pw = NULL; 1427 return; 1428 } 1429 } 1430 setusercontext(lc, pw, (uid_t)0, 1431 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1432 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1433 #else 1434 setlogin(pw->pw_name); 1435 (void) initgroups(pw->pw_name, pw->pw_gid); 1436 #endif 1437 1438 #ifdef USE_PAM 1439 if (pamh) { 1440 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1441 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1442 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1443 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1444 } 1445 } 1446 #endif 1447 1448 /* open wtmp before chroot */ 1449 if (dowtmp) 1450 ftpd_logwtmp(ttyline, pw->pw_name, 1451 (struct sockaddr *)&his_addr); 1452 logged_in = 1; 1453 1454 if (guest && stats && statfd < 0) 1455 #ifdef VIRTUAL_HOSTING 1456 if ((statfd = open(thishost->statfile, O_WRONLY|O_APPEND)) < 0) 1457 #else 1458 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1459 #endif 1460 stats = 0; 1461 1462 dochroot = 1463 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1464 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1465 || login_getcapbool(lc, "ftp-chroot", 0) 1466 #endif 1467 ; 1468 chrootdir = NULL; 1469 /* 1470 * For a chrooted local user, 1471 * a) see whether ftpchroot(5) specifies a chroot directory, 1472 * b) extract the directory pathname from the line, 1473 * c) expand it to the absolute pathname if necessary. 1474 */ 1475 if (dochroot && residue && 1476 (chrootdir = strtok(residue, " \t")) != NULL) { 1477 if (chrootdir[0] != '/') 1478 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1479 else 1480 chrootdir = strdup(chrootdir); /* so it can be freed */ 1481 if (chrootdir == NULL) 1482 fatalerror("Ran out of memory."); 1483 } 1484 if (guest || dochroot) { 1485 /* 1486 * If no chroot directory set yet, use the login directory. 1487 * Copy it so it can be modified while pw->pw_dir stays intact. 1488 */ 1489 if (chrootdir == NULL && 1490 (chrootdir = strdup(pw->pw_dir)) == NULL) 1491 fatalerror("Ran out of memory."); 1492 /* 1493 * Check for the "/chroot/./home" syntax, 1494 * separate the chroot and home directory pathnames. 1495 */ 1496 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1497 *(homedir++) = '\0'; /* wipe '/' */ 1498 homedir++; /* skip '.' */ 1499 /* so chrootdir can be freed later */ 1500 if ((homedir = strdup(homedir)) == NULL) 1501 fatalerror("Ran out of memory."); 1502 } else { 1503 /* 1504 * We MUST do a chdir() after the chroot. Otherwise 1505 * the old current directory will be accessible as "." 1506 * outside the new root! 1507 */ 1508 homedir = "/"; 1509 } 1510 /* 1511 * Finally, do chroot() 1512 */ 1513 if (chroot(chrootdir) < 0) { 1514 reply(550, "Can't change root."); 1515 goto bad; 1516 } 1517 } else /* real user w/o chroot */ 1518 homedir = pw->pw_dir; 1519 /* 1520 * Set euid *before* doing chdir() so 1521 * a) the user won't be carried to a directory that he couldn't reach 1522 * on his own due to no permission to upper path components, 1523 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1524 * (uid 0 has no root power over NFS if not mapped explicitly.) 1525 */ 1526 if (seteuid((uid_t)pw->pw_uid) < 0) { 1527 reply(550, "Can't set uid."); 1528 goto bad; 1529 } 1530 if (chdir(homedir) < 0) { 1531 if (guest || dochroot) { 1532 reply(550, "Can't change to base directory."); 1533 goto bad; 1534 } else { 1535 if (chdir("/") < 0) { 1536 reply(550, "Root is inaccessible."); 1537 goto bad; 1538 } 1539 lreply(230, "No directory! Logging in with home=/"); 1540 } 1541 } 1542 1543 /* 1544 * Display a login message, if it exists. 1545 * N.B. reply(230,) must follow the message. 1546 */ 1547 #ifdef VIRTUAL_HOSTING 1548 if ((fd = fopen(thishost->loginmsg, "r")) != NULL) { 1549 #else 1550 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 1551 #endif 1552 char *cp, line[LINE_MAX]; 1553 1554 while (fgets(line, sizeof(line), fd) != NULL) { 1555 if ((cp = strchr(line, '\n')) != NULL) 1556 *cp = '\0'; 1557 lreply(230, "%s", line); 1558 } 1559 (void) fflush(stdout); 1560 (void) fclose(fd); 1561 } 1562 if (guest) { 1563 if (ident != NULL) 1564 free(ident); 1565 ident = strdup(passwd); 1566 if (ident == NULL) 1567 fatalerror("Ran out of memory."); 1568 1569 reply(230, "Guest login ok, access restrictions apply."); 1570 #ifdef SETPROCTITLE 1571 #ifdef VIRTUAL_HOSTING 1572 if (thishost != firsthost) 1573 snprintf(proctitle, sizeof(proctitle), 1574 "%s: anonymous(%s)/%s", remotehost, hostname, 1575 passwd); 1576 else 1577 #endif 1578 snprintf(proctitle, sizeof(proctitle), 1579 "%s: anonymous/%s", remotehost, passwd); 1580 setproctitle("%s", proctitle); 1581 #endif /* SETPROCTITLE */ 1582 if (logging) 1583 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1584 remotehost, passwd); 1585 } else { 1586 if (dochroot) 1587 reply(230, "User %s logged in, " 1588 "access restrictions apply.", pw->pw_name); 1589 else 1590 reply(230, "User %s logged in.", pw->pw_name); 1591 1592 #ifdef SETPROCTITLE 1593 snprintf(proctitle, sizeof(proctitle), 1594 "%s: user/%s", remotehost, pw->pw_name); 1595 setproctitle("%s", proctitle); 1596 #endif /* SETPROCTITLE */ 1597 if (logging) 1598 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1599 remotehost, pw->pw_name); 1600 } 1601 #ifdef LOGIN_CAP 1602 login_close(lc); 1603 #endif 1604 if (chrootdir) 1605 free(chrootdir); 1606 if (residue) 1607 free(residue); 1608 return; 1609 bad: 1610 /* Forget all about it... */ 1611 #ifdef LOGIN_CAP 1612 login_close(lc); 1613 #endif 1614 if (chrootdir) 1615 free(chrootdir); 1616 if (residue) 1617 free(residue); 1618 end_login(); 1619 } 1620 1621 void 1622 retrieve(char *cmd, char *name) 1623 { 1624 FILE *fin, *dout; 1625 struct stat st; 1626 int (*closefunc)(FILE *); 1627 time_t start; 1628 1629 if (cmd == 0) { 1630 fin = fopen(name, "r"), closefunc = fclose; 1631 st.st_size = 0; 1632 } else { 1633 char line[BUFSIZ]; 1634 1635 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1636 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1637 st.st_size = -1; 1638 st.st_blksize = BUFSIZ; 1639 } 1640 if (fin == NULL) { 1641 if (errno != 0) { 1642 perror_reply(550, name); 1643 if (cmd == 0) { 1644 LOGCMD("get", name); 1645 } 1646 } 1647 return; 1648 } 1649 byte_count = -1; 1650 if (cmd == 0) { 1651 if (fstat(fileno(fin), &st) < 0) { 1652 perror_reply(550, name); 1653 goto done; 1654 } 1655 if (!S_ISREG(st.st_mode)) { 1656 /* 1657 * Never sending a raw directory is a workaround 1658 * for buggy clients that will attempt to RETR 1659 * a directory before listing it, e.g., Mozilla. 1660 * Preventing a guest from getting irregular files 1661 * is a simple security measure. 1662 */ 1663 if (S_ISDIR(st.st_mode) || guest) { 1664 reply(550, "%s: not a plain file.", name); 1665 goto done; 1666 } 1667 st.st_size = -1; 1668 /* st.st_blksize is set for all descriptor types */ 1669 } 1670 } 1671 if (restart_point) { 1672 if (type == TYPE_A) { 1673 off_t i, n; 1674 int c; 1675 1676 n = restart_point; 1677 i = 0; 1678 while (i++ < n) { 1679 if ((c=getc(fin)) == EOF) { 1680 perror_reply(550, name); 1681 goto done; 1682 } 1683 if (c == '\n') 1684 i++; 1685 } 1686 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1687 perror_reply(550, name); 1688 goto done; 1689 } 1690 } 1691 dout = dataconn(name, st.st_size, "w"); 1692 if (dout == NULL) 1693 goto done; 1694 time(&start); 1695 send_data(fin, dout, st.st_blksize, st.st_size, 1696 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1697 if (cmd == 0 && guest && stats) 1698 logxfer(name, st.st_size, start); 1699 (void) fclose(dout); 1700 data = -1; 1701 pdata = -1; 1702 done: 1703 if (cmd == 0) 1704 LOGBYTES("get", name, byte_count); 1705 (*closefunc)(fin); 1706 } 1707 1708 void 1709 store(char *name, char *mode, int unique) 1710 { 1711 int fd; 1712 FILE *fout, *din; 1713 int (*closefunc)(FILE *); 1714 1715 if (*mode == 'a') { /* APPE */ 1716 if (unique) { 1717 /* Programming error */ 1718 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1719 unique = 0; 1720 } 1721 if (guest && noguestmod) { 1722 reply(550, "Appending to existing file denied"); 1723 goto err; 1724 } 1725 restart_point = 0; /* not affected by preceding REST */ 1726 } 1727 if (unique) /* STOU overrides REST */ 1728 restart_point = 0; 1729 if (guest && noguestmod) { 1730 if (restart_point) { /* guest STOR w/REST */ 1731 reply(550, "Modifying existing file denied"); 1732 goto err; 1733 } else /* treat guest STOR as STOU */ 1734 unique = 1; 1735 } 1736 1737 if (restart_point) 1738 mode = "r+"; /* so ASCII manual seek can work */ 1739 if (unique) { 1740 if ((fd = guniquefd(name, &name)) < 0) 1741 goto err; 1742 fout = fdopen(fd, mode); 1743 } else 1744 fout = fopen(name, mode); 1745 closefunc = fclose; 1746 if (fout == NULL) { 1747 perror_reply(553, name); 1748 goto err; 1749 } 1750 byte_count = -1; 1751 if (restart_point) { 1752 if (type == TYPE_A) { 1753 off_t i, n; 1754 int c; 1755 1756 n = restart_point; 1757 i = 0; 1758 while (i++ < n) { 1759 if ((c=getc(fout)) == EOF) { 1760 perror_reply(550, name); 1761 goto done; 1762 } 1763 if (c == '\n') 1764 i++; 1765 } 1766 /* 1767 * We must do this seek to "current" position 1768 * because we are changing from reading to 1769 * writing. 1770 */ 1771 if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) { 1772 perror_reply(550, name); 1773 goto done; 1774 } 1775 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1776 perror_reply(550, name); 1777 goto done; 1778 } 1779 } 1780 din = dataconn(name, (off_t)-1, "r"); 1781 if (din == NULL) 1782 goto done; 1783 if (receive_data(din, fout) == 0) { 1784 if (unique) 1785 reply(226, "Transfer complete (unique file name:%s).", 1786 name); 1787 else 1788 reply(226, "Transfer complete."); 1789 } 1790 (void) fclose(din); 1791 data = -1; 1792 pdata = -1; 1793 done: 1794 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1795 (*closefunc)(fout); 1796 return; 1797 err: 1798 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1799 return; 1800 } 1801 1802 static FILE * 1803 getdatasock(char *mode) 1804 { 1805 int on = 1, s, t, tries; 1806 1807 if (data >= 0) 1808 return (fdopen(data, mode)); 1809 (void) seteuid((uid_t)0); 1810 1811 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1812 if (s < 0) 1813 goto bad; 1814 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1815 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1816 /* anchor socket to avoid multi-homing problems */ 1817 data_source = ctrl_addr; 1818 data_source.su_port = htons(dataport); 1819 for (tries = 1; ; tries++) { 1820 if (bind(s, (struct sockaddr *)&data_source, 1821 data_source.su_len) >= 0) 1822 break; 1823 if (errno != EADDRINUSE || tries > 10) 1824 goto bad; 1825 sleep(tries); 1826 } 1827 (void) seteuid((uid_t)pw->pw_uid); 1828 #ifdef IP_TOS 1829 if (data_source.su_family == AF_INET) 1830 { 1831 on = IPTOS_THROUGHPUT; 1832 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1833 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1834 } 1835 #endif 1836 #ifdef TCP_NOPUSH 1837 /* 1838 * Turn off push flag to keep sender TCP from sending short packets 1839 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1840 * to set the send buffer size as well, but that may not be desirable 1841 * in heavy-load situations. 1842 */ 1843 on = 1; 1844 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1845 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1846 #endif 1847 #ifdef SO_SNDBUF 1848 on = 65536; 1849 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1850 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1851 #endif 1852 1853 return (fdopen(s, mode)); 1854 bad: 1855 /* Return the real value of errno (close may change it) */ 1856 t = errno; 1857 (void) seteuid((uid_t)pw->pw_uid); 1858 (void) close(s); 1859 errno = t; 1860 return (NULL); 1861 } 1862 1863 static FILE * 1864 dataconn(char *name, off_t size, char *mode) 1865 { 1866 char sizebuf[32]; 1867 FILE *file; 1868 int retry = 0, tos, conerrno; 1869 1870 file_size = size; 1871 byte_count = 0; 1872 if (size != (off_t) -1) 1873 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size); 1874 else 1875 *sizebuf = '\0'; 1876 if (pdata >= 0) { 1877 union sockunion from; 1878 int flags; 1879 int s, fromlen = ctrl_addr.su_len; 1880 struct timeval timeout; 1881 fd_set set; 1882 1883 FD_ZERO(&set); 1884 FD_SET(pdata, &set); 1885 1886 timeout.tv_usec = 0; 1887 timeout.tv_sec = 120; 1888 1889 /* 1890 * Granted a socket is in the blocking I/O mode, 1891 * accept() will block after a successful select() 1892 * if the selected connection dies in between. 1893 * Therefore set the non-blocking I/O flag here. 1894 */ 1895 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1896 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1897 goto pdata_err; 1898 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) <= 0 || 1899 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1900 goto pdata_err; 1901 (void) close(pdata); 1902 pdata = s; 1903 /* 1904 * Unset the inherited non-blocking I/O flag 1905 * on the child socket so stdio can work on it. 1906 */ 1907 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1908 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1909 goto pdata_err; 1910 #ifdef IP_TOS 1911 if (from.su_family == AF_INET) 1912 { 1913 tos = IPTOS_THROUGHPUT; 1914 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1915 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1916 } 1917 #endif 1918 reply(150, "Opening %s mode data connection for '%s'%s.", 1919 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1920 return (fdopen(pdata, mode)); 1921 pdata_err: 1922 reply(425, "Can't open data connection."); 1923 (void) close(pdata); 1924 pdata = -1; 1925 return (NULL); 1926 } 1927 if (data >= 0) { 1928 reply(125, "Using existing data connection for '%s'%s.", 1929 name, sizebuf); 1930 usedefault = 1; 1931 return (fdopen(data, mode)); 1932 } 1933 if (usedefault) 1934 data_dest = his_addr; 1935 usedefault = 1; 1936 do { 1937 file = getdatasock(mode); 1938 if (file == NULL) { 1939 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1940 getnameinfo((struct sockaddr *)&data_source, 1941 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1942 portbuf, sizeof(portbuf), 1943 NI_NUMERICHOST|NI_NUMERICSERV); 1944 reply(425, "Can't create data socket (%s,%s): %s.", 1945 hostbuf, portbuf, strerror(errno)); 1946 return (NULL); 1947 } 1948 data = fileno(file); 1949 conerrno = 0; 1950 if (connect(data, (struct sockaddr *)&data_dest, 1951 data_dest.su_len) == 0) 1952 break; 1953 conerrno = errno; 1954 (void) fclose(file); 1955 data = -1; 1956 if (conerrno == EADDRINUSE) { 1957 sleep((unsigned) swaitint); 1958 retry += swaitint; 1959 } else { 1960 break; 1961 } 1962 } while (retry <= swaitmax); 1963 if (conerrno != 0) { 1964 perror_reply(425, "Can't build data connection"); 1965 return (NULL); 1966 } 1967 reply(150, "Opening %s mode data connection for '%s'%s.", 1968 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1969 return (file); 1970 } 1971 1972 /* 1973 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1974 * encapsulation of the data subject to Mode, Structure, and Type. 1975 * 1976 * NB: Form isn't handled. 1977 */ 1978 static int 1979 send_data(FILE *instr, FILE *outstr, off_t blksize, off_t filesize, int isreg) 1980 { 1981 int c, cp, filefd, netfd; 1982 char *buf; 1983 off_t cnt; 1984 1985 transflag++; 1986 switch (type) { 1987 1988 case TYPE_A: 1989 cp = '\0'; 1990 while ((c = getc(instr)) != EOF) { 1991 if (recvurg) 1992 goto got_oob; 1993 byte_count++; 1994 if (c == '\n' && cp != '\r') { 1995 if (ferror(outstr)) 1996 goto data_err; 1997 (void) putc('\r', outstr); 1998 } 1999 (void) putc(c, outstr); 2000 cp = c; 2001 } 2002 if (recvurg) 2003 goto got_oob; 2004 fflush(outstr); 2005 transflag = 0; 2006 if (ferror(instr)) 2007 goto file_err; 2008 if (ferror(outstr)) 2009 goto data_err; 2010 reply(226, "Transfer complete."); 2011 return (0); 2012 2013 case TYPE_I: 2014 case TYPE_L: 2015 /* 2016 * isreg is only set if we are not doing restart and we 2017 * are sending a regular file 2018 */ 2019 netfd = fileno(outstr); 2020 filefd = fileno(instr); 2021 2022 if (isreg) { 2023 2024 off_t offset; 2025 int err; 2026 2027 err = cnt = offset = 0; 2028 2029 while (err != -1 && filesize > 0) { 2030 err = sendfile(filefd, netfd, offset, 0, 2031 (struct sf_hdtr *) NULL, &cnt, 0); 2032 /* 2033 * Calculate byte_count before OOB processing. 2034 * It can be used in myoob() later. 2035 */ 2036 byte_count += cnt; 2037 if (recvurg) 2038 goto got_oob; 2039 offset += cnt; 2040 filesize -= cnt; 2041 2042 if (err == -1) { 2043 if (!cnt) 2044 goto oldway; 2045 2046 goto data_err; 2047 } 2048 } 2049 2050 transflag = 0; 2051 reply(226, "Transfer complete."); 2052 return (0); 2053 } 2054 2055 oldway: 2056 if ((buf = malloc((u_int)blksize)) == NULL) { 2057 transflag = 0; 2058 perror_reply(451, "Local resource failure: malloc"); 2059 return (-1); 2060 } 2061 2062 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 2063 write(netfd, buf, cnt) == cnt) 2064 byte_count += cnt; 2065 transflag = 0; 2066 (void)free(buf); 2067 if (cnt != 0) { 2068 if (cnt < 0) 2069 goto file_err; 2070 goto data_err; 2071 } 2072 reply(226, "Transfer complete."); 2073 return (0); 2074 default: 2075 transflag = 0; 2076 reply(550, "Unimplemented TYPE %d in send_data", type); 2077 return (-1); 2078 } 2079 2080 data_err: 2081 transflag = 0; 2082 perror_reply(426, "Data connection"); 2083 return (-1); 2084 2085 file_err: 2086 transflag = 0; 2087 perror_reply(551, "Error on input file"); 2088 return (-1); 2089 2090 got_oob: 2091 myoob(); 2092 recvurg = 0; 2093 transflag = 0; 2094 return (-1); 2095 } 2096 2097 /* 2098 * Transfer data from peer to "outstr" using the appropriate encapulation of 2099 * the data subject to Mode, Structure, and Type. 2100 * 2101 * N.B.: Form isn't handled. 2102 */ 2103 static int 2104 receive_data(FILE *instr, FILE *outstr) 2105 { 2106 int c; 2107 int cnt, bare_lfs; 2108 char buf[BUFSIZ]; 2109 2110 transflag++; 2111 bare_lfs = 0; 2112 2113 switch (type) { 2114 2115 case TYPE_I: 2116 case TYPE_L: 2117 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 2118 if (recvurg) 2119 goto got_oob; 2120 if (write(fileno(outstr), buf, cnt) != cnt) 2121 goto file_err; 2122 byte_count += cnt; 2123 } 2124 if (recvurg) 2125 goto got_oob; 2126 if (cnt < 0) 2127 goto data_err; 2128 transflag = 0; 2129 return (0); 2130 2131 case TYPE_E: 2132 reply(553, "TYPE E not implemented."); 2133 transflag = 0; 2134 return (-1); 2135 2136 case TYPE_A: 2137 while ((c = getc(instr)) != EOF) { 2138 if (recvurg) 2139 goto got_oob; 2140 byte_count++; 2141 if (c == '\n') 2142 bare_lfs++; 2143 while (c == '\r') { 2144 if (ferror(outstr)) 2145 goto data_err; 2146 if ((c = getc(instr)) != '\n') { 2147 (void) putc ('\r', outstr); 2148 if (c == '\0' || c == EOF) 2149 goto contin2; 2150 } 2151 } 2152 (void) putc(c, outstr); 2153 contin2: ; 2154 } 2155 if (recvurg) 2156 goto got_oob; 2157 fflush(outstr); 2158 if (ferror(instr)) 2159 goto data_err; 2160 if (ferror(outstr)) 2161 goto file_err; 2162 transflag = 0; 2163 if (bare_lfs) { 2164 lreply(226, 2165 "WARNING! %d bare linefeeds received in ASCII mode", 2166 bare_lfs); 2167 (void)printf(" File may not have transferred correctly.\r\n"); 2168 } 2169 return (0); 2170 default: 2171 reply(550, "Unimplemented TYPE %d in receive_data", type); 2172 transflag = 0; 2173 return (-1); 2174 } 2175 2176 data_err: 2177 transflag = 0; 2178 perror_reply(426, "Data Connection"); 2179 return (-1); 2180 2181 file_err: 2182 transflag = 0; 2183 perror_reply(452, "Error writing file"); 2184 return (-1); 2185 2186 got_oob: 2187 myoob(); 2188 recvurg = 0; 2189 transflag = 0; 2190 return (-1); 2191 } 2192 2193 void 2194 statfilecmd(char *filename) 2195 { 2196 FILE *fin; 2197 int atstart; 2198 int c; 2199 char line[LINE_MAX]; 2200 2201 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2202 fin = ftpd_popen(line, "r"); 2203 lreply(211, "status of %s:", filename); 2204 atstart = 1; 2205 while ((c = getc(fin)) != EOF) { 2206 if (c == '\n') { 2207 if (ferror(stdout)){ 2208 perror_reply(421, "control connection"); 2209 (void) ftpd_pclose(fin); 2210 dologout(1); 2211 /* NOTREACHED */ 2212 } 2213 if (ferror(fin)) { 2214 perror_reply(551, filename); 2215 (void) ftpd_pclose(fin); 2216 return; 2217 } 2218 (void) putc('\r', stdout); 2219 } 2220 /* 2221 * RFC 959 says neutral text should be prepended before 2222 * a leading 3-digit number followed by whitespace, but 2223 * many ftp clients can be confused by any leading digits, 2224 * as a matter of fact. 2225 */ 2226 if (atstart && isdigit(c)) 2227 (void) putc(' ', stdout); 2228 (void) putc(c, stdout); 2229 atstart = (c == '\n'); 2230 } 2231 (void) ftpd_pclose(fin); 2232 reply(211, "End of Status"); 2233 } 2234 2235 void 2236 statcmd(void) 2237 { 2238 union sockunion *su; 2239 u_char *a, *p; 2240 char hname[NI_MAXHOST]; 2241 int ispassive; 2242 2243 if (hostinfo) { 2244 lreply(211, "%s FTP server status:", hostname); 2245 printf(" %s\r\n", version); 2246 } else 2247 lreply(211, "FTP server status:"); 2248 printf(" Connected to %s", remotehost); 2249 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2250 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2251 if (strcmp(hname, remotehost) != 0) 2252 printf(" (%s)", hname); 2253 } 2254 printf("\r\n"); 2255 if (logged_in) { 2256 if (guest) 2257 printf(" Logged in anonymously\r\n"); 2258 else 2259 printf(" Logged in as %s\r\n", pw->pw_name); 2260 } else if (askpasswd) 2261 printf(" Waiting for password\r\n"); 2262 else 2263 printf(" Waiting for user name\r\n"); 2264 printf(" TYPE: %s", typenames[type]); 2265 if (type == TYPE_A || type == TYPE_E) 2266 printf(", FORM: %s", formnames[form]); 2267 if (type == TYPE_L) 2268 #if CHAR_BIT == 8 2269 printf(" %d", CHAR_BIT); 2270 #else 2271 printf(" %d", bytesize); /* need definition! */ 2272 #endif 2273 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2274 strunames[stru], modenames[mode]); 2275 if (data != -1) 2276 printf(" Data connection open\r\n"); 2277 else if (pdata != -1) { 2278 ispassive = 1; 2279 su = &pasv_addr; 2280 goto printaddr; 2281 } else if (usedefault == 0) { 2282 ispassive = 0; 2283 su = &data_dest; 2284 printaddr: 2285 #define UC(b) (((int) b) & 0xff) 2286 if (epsvall) { 2287 printf(" EPSV only mode (EPSV ALL)\r\n"); 2288 goto epsvonly; 2289 } 2290 2291 /* PORT/PASV */ 2292 if (su->su_family == AF_INET) { 2293 a = (u_char *) &su->su_sin.sin_addr; 2294 p = (u_char *) &su->su_sin.sin_port; 2295 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2296 ispassive ? "PASV" : "PORT", 2297 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2298 UC(p[0]), UC(p[1])); 2299 } 2300 2301 /* LPRT/LPSV */ 2302 { 2303 int alen, af, i; 2304 2305 switch (su->su_family) { 2306 case AF_INET: 2307 a = (u_char *) &su->su_sin.sin_addr; 2308 p = (u_char *) &su->su_sin.sin_port; 2309 alen = sizeof(su->su_sin.sin_addr); 2310 af = 4; 2311 break; 2312 case AF_INET6: 2313 a = (u_char *) &su->su_sin6.sin6_addr; 2314 p = (u_char *) &su->su_sin6.sin6_port; 2315 alen = sizeof(su->su_sin6.sin6_addr); 2316 af = 6; 2317 break; 2318 default: 2319 af = 0; 2320 break; 2321 } 2322 if (af) { 2323 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2324 af, alen); 2325 for (i = 0; i < alen; i++) 2326 printf("%d,", UC(a[i])); 2327 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2328 } 2329 } 2330 2331 epsvonly:; 2332 /* EPRT/EPSV */ 2333 { 2334 int af; 2335 2336 switch (su->su_family) { 2337 case AF_INET: 2338 af = 1; 2339 break; 2340 case AF_INET6: 2341 af = 2; 2342 break; 2343 default: 2344 af = 0; 2345 break; 2346 } 2347 if (af) { 2348 union sockunion tmp; 2349 2350 tmp = *su; 2351 if (tmp.su_family == AF_INET6) 2352 tmp.su_sin6.sin6_scope_id = 0; 2353 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2354 hname, sizeof(hname) - 1, NULL, 0, 2355 NI_NUMERICHOST)) { 2356 printf(" %s |%d|%s|%d|\r\n", 2357 ispassive ? "EPSV" : "EPRT", 2358 af, hname, htons(tmp.su_port)); 2359 } 2360 } 2361 } 2362 #undef UC 2363 } else 2364 printf(" No data connection\r\n"); 2365 reply(211, "End of status"); 2366 } 2367 2368 void 2369 fatalerror(char *s) 2370 { 2371 2372 reply(451, "Error in server: %s\n", s); 2373 reply(221, "Closing connection due to server error."); 2374 dologout(0); 2375 /* NOTREACHED */ 2376 } 2377 2378 void 2379 reply(int n, const char *fmt, ...) 2380 { 2381 va_list ap; 2382 2383 (void)printf("%d ", n); 2384 va_start(ap, fmt); 2385 (void)vprintf(fmt, ap); 2386 va_end(ap); 2387 (void)printf("\r\n"); 2388 (void)fflush(stdout); 2389 if (ftpdebug) { 2390 syslog(LOG_DEBUG, "<--- %d ", n); 2391 va_start(ap, fmt); 2392 vsyslog(LOG_DEBUG, fmt, ap); 2393 va_end(ap); 2394 } 2395 } 2396 2397 void 2398 lreply(int n, const char *fmt, ...) 2399 { 2400 va_list ap; 2401 2402 (void)printf("%d- ", n); 2403 va_start(ap, fmt); 2404 (void)vprintf(fmt, ap); 2405 va_end(ap); 2406 (void)printf("\r\n"); 2407 (void)fflush(stdout); 2408 if (ftpdebug) { 2409 syslog(LOG_DEBUG, "<--- %d- ", n); 2410 va_start(ap, fmt); 2411 vsyslog(LOG_DEBUG, fmt, ap); 2412 va_end(ap); 2413 } 2414 } 2415 2416 static void 2417 ack(char *s) 2418 { 2419 2420 reply(250, "%s command successful.", s); 2421 } 2422 2423 void 2424 nack(char *s) 2425 { 2426 2427 reply(502, "%s command not implemented.", s); 2428 } 2429 2430 /* ARGSUSED */ 2431 void 2432 yyerror(char *s) 2433 { 2434 char *cp; 2435 2436 if ((cp = strchr(cbuf,'\n'))) 2437 *cp = '\0'; 2438 reply(500, "'%s': command not understood.", cbuf); 2439 } 2440 2441 void 2442 delete(char *name) 2443 { 2444 struct stat st; 2445 2446 LOGCMD("delete", name); 2447 if (lstat(name, &st) < 0) { 2448 perror_reply(550, name); 2449 return; 2450 } 2451 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2452 if (rmdir(name) < 0) { 2453 perror_reply(550, name); 2454 return; 2455 } 2456 goto done; 2457 } 2458 if (guest && noguestmod) { 2459 reply(550, "Operation not permitted"); 2460 return; 2461 } 2462 if (unlink(name) < 0) { 2463 perror_reply(550, name); 2464 return; 2465 } 2466 done: 2467 ack("DELE"); 2468 } 2469 2470 void 2471 cwd(char *path) 2472 { 2473 2474 if (chdir(path) < 0) 2475 perror_reply(550, path); 2476 else 2477 ack("CWD"); 2478 } 2479 2480 void 2481 makedir(char *name) 2482 { 2483 char *s; 2484 2485 LOGCMD("mkdir", name); 2486 if (guest && noguestmkd) 2487 reply(550, "%s: permission denied", name); 2488 else if (mkdir(name, 0777) < 0) 2489 perror_reply(550, name); 2490 else { 2491 if ((s = doublequote(name)) == NULL) 2492 fatalerror("Ran out of memory."); 2493 reply(257, "\"%s\" directory created.", s); 2494 free(s); 2495 } 2496 } 2497 2498 void 2499 removedir(char *name) 2500 { 2501 2502 LOGCMD("rmdir", name); 2503 if (rmdir(name) < 0) 2504 perror_reply(550, name); 2505 else 2506 ack("RMD"); 2507 } 2508 2509 void 2510 pwd(void) 2511 { 2512 char *s, path[MAXPATHLEN + 1]; 2513 2514 if (getwd(path) == (char *)NULL) 2515 reply(550, "%s.", path); 2516 else { 2517 if ((s = doublequote(path)) == NULL) 2518 fatalerror("Ran out of memory."); 2519 reply(257, "\"%s\" is current directory.", s); 2520 free(s); 2521 } 2522 } 2523 2524 char * 2525 renamefrom(char *name) 2526 { 2527 struct stat st; 2528 2529 if (guest && noguestmod) { 2530 reply(550, "Operation not permitted"); 2531 return (NULL); 2532 } 2533 if (lstat(name, &st) < 0) { 2534 perror_reply(550, name); 2535 return (NULL); 2536 } 2537 reply(350, "File exists, ready for destination name"); 2538 return (name); 2539 } 2540 2541 void 2542 renamecmd(char *from, char *to) 2543 { 2544 struct stat st; 2545 2546 LOGCMD2("rename", from, to); 2547 2548 if (guest && (stat(to, &st) == 0)) { 2549 reply(550, "%s: permission denied", to); 2550 return; 2551 } 2552 2553 if (rename(from, to) < 0) 2554 perror_reply(550, "rename"); 2555 else 2556 ack("RNTO"); 2557 } 2558 2559 static void 2560 dolog(struct sockaddr *who) 2561 { 2562 int error; 2563 2564 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2565 2566 #ifdef SETPROCTITLE 2567 #ifdef VIRTUAL_HOSTING 2568 if (thishost != firsthost) 2569 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2570 remotehost, hostname); 2571 else 2572 #endif 2573 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2574 remotehost); 2575 setproctitle("%s", proctitle); 2576 #endif /* SETPROCTITLE */ 2577 2578 if (logging) { 2579 #ifdef VIRTUAL_HOSTING 2580 if (thishost != firsthost) 2581 syslog(LOG_INFO, "connection from %s (to %s)", 2582 remotehost, hostname); 2583 else 2584 #endif 2585 { 2586 char who_name[MAXHOSTNAMELEN]; 2587 2588 error = getnameinfo(who, who->sa_len, 2589 who_name, sizeof(who_name) - 1, 2590 NULL, 0, NI_NUMERICHOST); 2591 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2592 error == 0 ? who_name : ""); 2593 } 2594 } 2595 } 2596 2597 /* 2598 * Record logout in wtmp file 2599 * and exit with supplied status. 2600 */ 2601 void 2602 dologout(int status) 2603 { 2604 /* 2605 * Prevent reception of SIGURG from resulting in a resumption 2606 * back to the main program loop. 2607 */ 2608 transflag = 0; 2609 2610 if (logged_in && dowtmp) { 2611 (void) seteuid((uid_t)0); 2612 ftpd_logwtmp(ttyline, "", NULL); 2613 } 2614 /* beware of flushing buffers after a SIGPIPE */ 2615 _exit(status); 2616 } 2617 2618 static void 2619 sigurg(int signo) 2620 { 2621 2622 recvurg = 1; 2623 } 2624 2625 static void 2626 myoob(void) 2627 { 2628 char *cp; 2629 2630 /* only process if transfer occurring */ 2631 if (!transflag) 2632 return; 2633 cp = tmpline; 2634 if (getline(cp, 7, stdin) == NULL) { 2635 reply(221, "You could at least say goodbye."); 2636 dologout(0); 2637 } 2638 upper(cp); 2639 if (strcmp(cp, "ABOR\r\n") == 0) { 2640 tmpline[0] = '\0'; 2641 reply(426, "Transfer aborted. Data connection closed."); 2642 reply(226, "Abort successful"); 2643 } 2644 if (strcmp(cp, "STAT\r\n") == 0) { 2645 tmpline[0] = '\0'; 2646 if (file_size != (off_t) -1) 2647 reply(213, "Status: %qd of %qd bytes transferred", 2648 byte_count, file_size); 2649 else 2650 reply(213, "Status: %qd bytes transferred", byte_count); 2651 } 2652 } 2653 2654 /* 2655 * Note: a response of 425 is not mentioned as a possible response to 2656 * the PASV command in RFC959. However, it has been blessed as 2657 * a legitimate response by Jon Postel in a telephone conversation 2658 * with Rick Adams on 25 Jan 89. 2659 */ 2660 void 2661 passive(void) 2662 { 2663 int len, on; 2664 char *p, *a; 2665 2666 if (pdata >= 0) /* close old port if one set */ 2667 close(pdata); 2668 2669 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2670 if (pdata < 0) { 2671 perror_reply(425, "Can't open passive connection"); 2672 return; 2673 } 2674 on = 1; 2675 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2676 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2677 2678 (void) seteuid((uid_t)0); 2679 2680 #ifdef IP_PORTRANGE 2681 if (ctrl_addr.su_family == AF_INET) { 2682 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2683 : IP_PORTRANGE_DEFAULT; 2684 2685 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2686 &on, sizeof(on)) < 0) 2687 goto pasv_error; 2688 } 2689 #endif 2690 #ifdef IPV6_PORTRANGE 2691 if (ctrl_addr.su_family == AF_INET6) { 2692 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2693 : IPV6_PORTRANGE_DEFAULT; 2694 2695 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2696 &on, sizeof(on)) < 0) 2697 goto pasv_error; 2698 } 2699 #endif 2700 2701 pasv_addr = ctrl_addr; 2702 pasv_addr.su_port = 0; 2703 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2704 goto pasv_error; 2705 2706 (void) seteuid((uid_t)pw->pw_uid); 2707 2708 len = sizeof(pasv_addr); 2709 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2710 goto pasv_error; 2711 if (listen(pdata, 1) < 0) 2712 goto pasv_error; 2713 if (pasv_addr.su_family == AF_INET) 2714 a = (char *) &pasv_addr.su_sin.sin_addr; 2715 else if (pasv_addr.su_family == AF_INET6 && 2716 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2717 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2718 else 2719 goto pasv_error; 2720 2721 p = (char *) &pasv_addr.su_port; 2722 2723 #define UC(b) (((int) b) & 0xff) 2724 2725 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2726 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2727 return; 2728 2729 pasv_error: 2730 (void) seteuid((uid_t)pw->pw_uid); 2731 (void) close(pdata); 2732 pdata = -1; 2733 perror_reply(425, "Can't open passive connection"); 2734 return; 2735 } 2736 2737 /* 2738 * Long Passive defined in RFC 1639. 2739 * 228 Entering Long Passive Mode 2740 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2741 */ 2742 2743 void 2744 long_passive(char *cmd, int pf) 2745 { 2746 int len, on; 2747 char *p, *a; 2748 2749 if (pdata >= 0) /* close old port if one set */ 2750 close(pdata); 2751 2752 if (pf != PF_UNSPEC) { 2753 if (ctrl_addr.su_family != pf) { 2754 switch (ctrl_addr.su_family) { 2755 case AF_INET: 2756 pf = 1; 2757 break; 2758 case AF_INET6: 2759 pf = 2; 2760 break; 2761 default: 2762 pf = 0; 2763 break; 2764 } 2765 /* 2766 * XXX 2767 * only EPRT/EPSV ready clients will understand this 2768 */ 2769 if (strcmp(cmd, "EPSV") == 0 && pf) { 2770 reply(522, "Network protocol mismatch, " 2771 "use (%d)", pf); 2772 } else 2773 reply(501, "Network protocol mismatch"); /*XXX*/ 2774 2775 return; 2776 } 2777 } 2778 2779 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2780 if (pdata < 0) { 2781 perror_reply(425, "Can't open passive connection"); 2782 return; 2783 } 2784 on = 1; 2785 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2786 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2787 2788 (void) seteuid((uid_t)0); 2789 2790 pasv_addr = ctrl_addr; 2791 pasv_addr.su_port = 0; 2792 len = pasv_addr.su_len; 2793 2794 #ifdef IP_PORTRANGE 2795 if (ctrl_addr.su_family == AF_INET) { 2796 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2797 : IP_PORTRANGE_DEFAULT; 2798 2799 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2800 &on, sizeof(on)) < 0) 2801 goto pasv_error; 2802 } 2803 #endif 2804 #ifdef IPV6_PORTRANGE 2805 if (ctrl_addr.su_family == AF_INET6) { 2806 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2807 : IPV6_PORTRANGE_DEFAULT; 2808 2809 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2810 &on, sizeof(on)) < 0) 2811 goto pasv_error; 2812 } 2813 #endif 2814 2815 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2816 goto pasv_error; 2817 2818 (void) seteuid((uid_t)pw->pw_uid); 2819 2820 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2821 goto pasv_error; 2822 if (listen(pdata, 1) < 0) 2823 goto pasv_error; 2824 2825 #define UC(b) (((int) b) & 0xff) 2826 2827 if (strcmp(cmd, "LPSV") == 0) { 2828 p = (char *)&pasv_addr.su_port; 2829 switch (pasv_addr.su_family) { 2830 case AF_INET: 2831 a = (char *) &pasv_addr.su_sin.sin_addr; 2832 v4_reply: 2833 reply(228, 2834 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2835 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2836 2, UC(p[0]), UC(p[1])); 2837 return; 2838 case AF_INET6: 2839 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2840 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2841 goto v4_reply; 2842 } 2843 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2844 reply(228, 2845 "Entering Long Passive Mode " 2846 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2847 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2848 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2849 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2850 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2851 2, UC(p[0]), UC(p[1])); 2852 return; 2853 } 2854 } else if (strcmp(cmd, "EPSV") == 0) { 2855 switch (pasv_addr.su_family) { 2856 case AF_INET: 2857 case AF_INET6: 2858 reply(229, "Entering Extended Passive Mode (|||%d|)", 2859 ntohs(pasv_addr.su_port)); 2860 return; 2861 } 2862 } else { 2863 /* more proper error code? */ 2864 } 2865 2866 pasv_error: 2867 (void) seteuid((uid_t)pw->pw_uid); 2868 (void) close(pdata); 2869 pdata = -1; 2870 perror_reply(425, "Can't open passive connection"); 2871 return; 2872 } 2873 2874 /* 2875 * Generate unique name for file with basename "local" 2876 * and open the file in order to avoid possible races. 2877 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2878 * Return descriptor to the file, set "name" to its name. 2879 * 2880 * Generates failure reply on error. 2881 */ 2882 static int 2883 guniquefd(char *local, char **name) 2884 { 2885 static char new[MAXPATHLEN]; 2886 struct stat st; 2887 char *cp; 2888 int count; 2889 int fd; 2890 2891 cp = strrchr(local, '/'); 2892 if (cp) 2893 *cp = '\0'; 2894 if (stat(cp ? local : ".", &st) < 0) { 2895 perror_reply(553, cp ? local : "."); 2896 return (-1); 2897 } 2898 if (cp) { 2899 /* 2900 * Let not overwrite dirname with counter suffix. 2901 * -4 is for /nn\0 2902 * In this extreme case dot won't be put in front of suffix. 2903 */ 2904 if (strlen(local) > sizeof(new) - 4) { 2905 reply(553, "Pathname too long"); 2906 return (-1); 2907 } 2908 *cp = '/'; 2909 } 2910 /* -4 is for the .nn<null> we put on the end below */ 2911 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2912 cp = new + strlen(new); 2913 /* 2914 * Don't generate dotfile unless requested explicitly. 2915 * This covers the case when basename gets truncated off 2916 * by buffer size. 2917 */ 2918 if (cp > new && cp[-1] != '/') 2919 *cp++ = '.'; 2920 for (count = 0; count < 100; count++) { 2921 /* At count 0 try unmodified name */ 2922 if (count) 2923 (void)sprintf(cp, "%d", count); 2924 if ((fd = open(count ? new : local, 2925 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2926 *name = count ? new : local; 2927 return (fd); 2928 } 2929 if (errno != EEXIST) { 2930 perror_reply(553, count ? new : local); 2931 return (-1); 2932 } 2933 } 2934 reply(452, "Unique file name cannot be created."); 2935 return (-1); 2936 } 2937 2938 /* 2939 * Format and send reply containing system error number. 2940 */ 2941 void 2942 perror_reply(int code, char *string) 2943 { 2944 2945 reply(code, "%s: %s.", string, strerror(errno)); 2946 } 2947 2948 static char *onefile[] = { 2949 "", 2950 0 2951 }; 2952 2953 void 2954 send_file_list(char *whichf) 2955 { 2956 struct stat st; 2957 DIR *dirp = NULL; 2958 struct dirent *dir; 2959 FILE *dout = NULL; 2960 char **dirlist, *dirname; 2961 int simple = 0; 2962 int freeglob = 0; 2963 glob_t gl; 2964 2965 if (strpbrk(whichf, "~{[*?") != NULL) { 2966 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2967 2968 memset(&gl, 0, sizeof(gl)); 2969 gl.gl_matchc = MAXGLOBARGS; 2970 flags |= GLOB_LIMIT; 2971 freeglob = 1; 2972 if (glob(whichf, flags, 0, &gl)) { 2973 reply(550, "not found"); 2974 goto out; 2975 } else if (gl.gl_pathc == 0) { 2976 errno = ENOENT; 2977 perror_reply(550, whichf); 2978 goto out; 2979 } 2980 dirlist = gl.gl_pathv; 2981 } else { 2982 onefile[0] = whichf; 2983 dirlist = onefile; 2984 simple = 1; 2985 } 2986 2987 while ((dirname = *dirlist++)) { 2988 if (stat(dirname, &st) < 0) { 2989 /* 2990 * If user typed "ls -l", etc, and the client 2991 * used NLST, do what the user meant. 2992 */ 2993 if (dirname[0] == '-' && *dirlist == NULL && 2994 transflag == 0) { 2995 retrieve(_PATH_LS " %s", dirname); 2996 goto out; 2997 } 2998 perror_reply(550, whichf); 2999 if (dout != NULL) { 3000 (void) fclose(dout); 3001 transflag = 0; 3002 data = -1; 3003 pdata = -1; 3004 } 3005 goto out; 3006 } 3007 3008 if (S_ISREG(st.st_mode)) { 3009 if (dout == NULL) { 3010 dout = dataconn("file list", (off_t)-1, "w"); 3011 if (dout == NULL) 3012 goto out; 3013 transflag++; 3014 } 3015 fprintf(dout, "%s%s\n", dirname, 3016 type == TYPE_A ? "\r" : ""); 3017 byte_count += strlen(dirname) + 1; 3018 continue; 3019 } else if (!S_ISDIR(st.st_mode)) 3020 continue; 3021 3022 if ((dirp = opendir(dirname)) == NULL) 3023 continue; 3024 3025 while ((dir = readdir(dirp)) != NULL) { 3026 char nbuf[MAXPATHLEN]; 3027 3028 if (recvurg) { 3029 myoob(); 3030 recvurg = 0; 3031 transflag = 0; 3032 goto out; 3033 } 3034 3035 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3036 continue; 3037 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3038 dir->d_namlen == 2) 3039 continue; 3040 3041 snprintf(nbuf, sizeof(nbuf), 3042 "%s/%s", dirname, dir->d_name); 3043 3044 /* 3045 * We have to do a stat to insure it's 3046 * not a directory or special file. 3047 */ 3048 if (simple || (stat(nbuf, &st) == 0 && 3049 S_ISREG(st.st_mode))) { 3050 if (dout == NULL) { 3051 dout = dataconn("file list", (off_t)-1, 3052 "w"); 3053 if (dout == NULL) 3054 goto out; 3055 transflag++; 3056 } 3057 if (nbuf[0] == '.' && nbuf[1] == '/') 3058 fprintf(dout, "%s%s\n", &nbuf[2], 3059 type == TYPE_A ? "\r" : ""); 3060 else 3061 fprintf(dout, "%s%s\n", nbuf, 3062 type == TYPE_A ? "\r" : ""); 3063 byte_count += strlen(nbuf) + 1; 3064 } 3065 } 3066 (void) closedir(dirp); 3067 } 3068 3069 if (dout == NULL) 3070 reply(550, "No files found."); 3071 else if (ferror(dout) != 0) 3072 perror_reply(550, "Data connection"); 3073 else 3074 reply(226, "Transfer complete."); 3075 3076 transflag = 0; 3077 if (dout != NULL) 3078 (void) fclose(dout); 3079 data = -1; 3080 pdata = -1; 3081 out: 3082 if (freeglob) { 3083 freeglob = 0; 3084 globfree(&gl); 3085 } 3086 } 3087 3088 void 3089 reapchild(int signo) 3090 { 3091 while (wait3(NULL, WNOHANG, NULL) > 0); 3092 } 3093 3094 #ifdef OLD_SETPROCTITLE 3095 /* 3096 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3097 * Warning, since this is usually started from inetd.conf, it often doesn't 3098 * have much of an environment or arglist to overwrite. 3099 */ 3100 void 3101 setproctitle(const char *fmt, ...) 3102 { 3103 int i; 3104 va_list ap; 3105 char *p, *bp, ch; 3106 char buf[LINE_MAX]; 3107 3108 va_start(ap, fmt); 3109 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3110 3111 /* make ps print our process name */ 3112 p = Argv[0]; 3113 *p++ = '-'; 3114 3115 i = strlen(buf); 3116 if (i > LastArgv - p - 2) { 3117 i = LastArgv - p - 2; 3118 buf[i] = '\0'; 3119 } 3120 bp = buf; 3121 while (ch = *bp++) 3122 if (ch != '\n' && ch != '\r') 3123 *p++ = ch; 3124 while (p < LastArgv) 3125 *p++ = ' '; 3126 } 3127 #endif /* OLD_SETPROCTITLE */ 3128 3129 static void 3130 logxfer(char *name, off_t size, time_t start) 3131 { 3132 char buf[1024]; 3133 char path[MAXPATHLEN + 1]; 3134 time_t now; 3135 3136 if (statfd >= 0 && getwd(path) != NULL) { 3137 time(&now); 3138 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n", 3139 ctime(&now)+4, ident, remotehost, 3140 path, name, (long long)size, 3141 (long)(now - start + (now == start))); 3142 write(statfd, buf, strlen(buf)); 3143 } 3144 } 3145 3146 static char * 3147 doublequote(char *s) 3148 { 3149 int n; 3150 char *p, *s2; 3151 3152 for (p = s, n = 0; *p; p++) 3153 if (*p == '"') 3154 n++; 3155 3156 if ((s2 = malloc(p - s + n + 1)) == NULL) 3157 return (NULL); 3158 3159 for (p = s2; *s; s++, p++) { 3160 if ((*p = *s) == '"') 3161 *(++p) = '"'; 3162 } 3163 *p = '\0'; 3164 3165 return (s2); 3166 } 3167 3168 /* setup server socket for specified address family */ 3169 /* if af is PF_UNSPEC more than one socket may be returned */ 3170 /* the returned list is dynamically allocated, so caller needs to free it */ 3171 static int * 3172 socksetup(int af, char *bindname, const char *bindport) 3173 { 3174 struct addrinfo hints, *res, *r; 3175 int error, maxs, *s, *socks; 3176 const int on = 1; 3177 3178 memset(&hints, 0, sizeof(hints)); 3179 hints.ai_flags = AI_PASSIVE; 3180 hints.ai_family = af; 3181 hints.ai_socktype = SOCK_STREAM; 3182 error = getaddrinfo(bindname, bindport, &hints, &res); 3183 if (error) { 3184 syslog(LOG_ERR, "%s", gai_strerror(error)); 3185 if (error == EAI_SYSTEM) 3186 syslog(LOG_ERR, "%s", strerror(errno)); 3187 return NULL; 3188 } 3189 3190 /* Count max number of sockets we may open */ 3191 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3192 ; 3193 socks = malloc((maxs + 1) * sizeof(int)); 3194 if (!socks) { 3195 freeaddrinfo(res); 3196 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3197 return NULL; 3198 } 3199 3200 *socks = 0; /* num of sockets counter at start of array */ 3201 s = socks + 1; 3202 for (r = res; r; r = r->ai_next) { 3203 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3204 if (*s < 0) { 3205 syslog(LOG_DEBUG, "control socket: %m"); 3206 continue; 3207 } 3208 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3209 &on, sizeof(on)) < 0) 3210 syslog(LOG_WARNING, 3211 "control setsockopt (SO_REUSEADDR): %m"); 3212 if (r->ai_family == AF_INET6) { 3213 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3214 &on, sizeof(on)) < 0) 3215 syslog(LOG_WARNING, 3216 "control setsockopt (IPV6_V6ONLY): %m"); 3217 } 3218 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3219 syslog(LOG_DEBUG, "control bind: %m"); 3220 close(*s); 3221 continue; 3222 } 3223 (*socks)++; 3224 s++; 3225 } 3226 3227 if (res) 3228 freeaddrinfo(res); 3229 3230 if (*socks == 0) { 3231 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3232 free(socks); 3233 return NULL; 3234 } 3235 return(socks); 3236 } 3237