ftpd.c revision 1.39.2.3
1 /* $NetBSD: ftpd.c,v 1.39.2.3 1997/12/01 20:06:36 mellon Exp $ */ 2 3 /* 4 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT( 39 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"); 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 46 #else 47 __RCSID("$NetBSD: ftpd.c,v 1.39.2.3 1997/12/01 20:06:36 mellon Exp $"); 48 #endif 49 #endif /* not lint */ 50 51 /* 52 * FTP server. 53 */ 54 #include <sys/param.h> 55 #include <sys/stat.h> 56 #include <sys/ioctl.h> 57 #include <sys/socket.h> 58 #include <sys/wait.h> 59 60 #include <netinet/in.h> 61 #include <netinet/in_systm.h> 62 #include <netinet/ip.h> 63 64 #define FTP_NAMES 65 #include <arpa/ftp.h> 66 #include <arpa/inet.h> 67 #include <arpa/telnet.h> 68 69 #include <ctype.h> 70 #include <dirent.h> 71 #include <err.h> 72 #include <errno.h> 73 #include <fcntl.h> 74 #include <fnmatch.h> 75 #include <glob.h> 76 #include <limits.h> 77 #include <netdb.h> 78 #include <pwd.h> 79 #include <setjmp.h> 80 #include <signal.h> 81 #include <stdio.h> 82 #include <stdlib.h> 83 #include <string.h> 84 #include <syslog.h> 85 #include <time.h> 86 #include <unistd.h> 87 #ifdef SKEY 88 #include <skey.h> 89 #endif 90 #ifdef KERBEROS5 91 #include <krb5.h> 92 #endif 93 94 #include "extern.h" 95 #include "pathnames.h" 96 97 #if __STDC__ 98 #include <stdarg.h> 99 #else 100 #include <varargs.h> 101 #endif 102 103 static char version[] = "Version 7.02"; 104 105 extern off_t restart_point; 106 extern char cbuf[]; 107 extern int yyparse __P((void)); 108 109 struct sockaddr_in ctrl_addr; 110 struct sockaddr_in data_source; 111 struct sockaddr_in data_dest; 112 struct sockaddr_in his_addr; 113 struct sockaddr_in pasv_addr; 114 115 int data; 116 jmp_buf errcatch, urgcatch; 117 int logged_in; 118 struct passwd *pw; 119 int debug; 120 int logging; 121 int guest; 122 int dochroot; 123 int type; 124 int form; 125 int stru; /* avoid C keyword */ 126 int mode; 127 int usedefault = 1; /* for data transfers */ 128 int pdata = -1; /* for passive mode */ 129 sig_atomic_t transflag; 130 off_t file_size; 131 off_t byte_count; 132 char tmpline[7]; 133 char hostname[MAXHOSTNAMELEN]; 134 char remotehost[MAXHOSTNAMELEN]; 135 static char ttyline[20]; 136 char *tty = ttyline; /* for klogin */ 137 static char *anondir = NULL; 138 static char confdir[MAXPATHLEN]; 139 140 extern struct ftpclass curclass; 141 142 #if defined(KERBEROS) || defined(KERBEROS5) 143 int notickets = 1; 144 char *krbtkfile_env = NULL; 145 #endif 146 #ifdef KERBEROS5 147 extern krb5_context kcontext; 148 #endif 149 150 /* 151 * Timeout intervals for retrying connections 152 * to hosts that don't accept PORT cmds. This 153 * is a kludge, but given the problems with TCP... 154 */ 155 #define SWAITMAX 90 /* wait at most 90 seconds */ 156 #define SWAITINT 5 /* interval between retries */ 157 158 int swaitmax = SWAITMAX; 159 int swaitint = SWAITINT; 160 161 #ifdef HASSETPROCTITLE 162 char proctitle[BUFSIZ]; /* initial part of title */ 163 #endif /* HASSETPROCTITLE */ 164 165 #define LOGCMD(cmd, file) \ 166 if (logging > 1) \ 167 syslog(LOG_INFO,"%s %s%s", cmd, \ 168 *(file) == '/' ? "" : curdir(), file); 169 #define LOGCMD2(cmd, file1, file2) \ 170 if (logging > 1) \ 171 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 172 *(file1) == '/' ? "" : curdir(), file1, \ 173 *(file2) == '/' ? "" : curdir(), file2); 174 #define LOGBYTES(cmd, file, cnt) \ 175 if (logging > 1) { \ 176 if (cnt == (off_t)-1) \ 177 syslog(LOG_INFO,"%s %s%s", cmd, \ 178 *(file) == '/' ? "" : curdir(), file); \ 179 else \ 180 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 181 cmd, (*(file) == '/') ? "" : curdir(), file, \ 182 (long long)cnt); \ 183 } 184 185 static void ack __P((char *)); 186 static void myoob __P((int)); 187 static int checkuser __P((char *, char *)); 188 static int checkaccess __P((char *)); 189 static FILE *dataconn __P((char *, off_t, char *)); 190 static void dolog __P((struct sockaddr_in *)); 191 static char *curdir __P((void)); 192 static void end_login __P((void)); 193 static FILE *getdatasock __P((char *)); 194 static char *gunique __P((char *)); 195 static void lostconn __P((int)); 196 static int receive_data __P((FILE *, FILE *)); 197 static void replydirname __P((const char *, const char *)); 198 static void send_data __P((FILE *, FILE *, off_t)); 199 static struct passwd * 200 sgetpwnam __P((char *)); 201 static char *sgetsave __P((char *)); 202 203 int main __P((int, char *[])); 204 205 #if defined(KERBEROS) || defined(KERBEROS5) 206 int klogin __P((struct passwd *, char *, char *, char *)); 207 void kdestroy __P((void)); 208 #endif 209 210 static char * 211 curdir() 212 { 213 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 214 215 if (getcwd(path, sizeof(path)-2) == NULL) 216 return (""); 217 if (path[1] != '\0') /* special case for root dir. */ 218 strcat(path, "/"); 219 /* For guest account, skip / since it's chrooted */ 220 return (guest ? path+1 : path); 221 } 222 223 int 224 main(argc, argv) 225 int argc; 226 char *argv[]; 227 { 228 int addrlen, ch, on = 1, tos; 229 char *cp, line[LINE_MAX]; 230 FILE *fd; 231 #ifdef KERBEROS5 232 krb5_error_code kerror; 233 #endif 234 235 debug = 0; 236 logging = 0; 237 (void)strcpy(confdir, _DEFAULT_CONFDIR); 238 239 while ((ch = getopt(argc, argv, "a:c:C:dlt:T:u:v")) != -1) { 240 switch (ch) { 241 case 'a': 242 anondir = optarg; 243 break; 244 245 case 'c': 246 (void)strncpy(confdir, optarg, sizeof(confdir)); 247 confdir[sizeof(confdir)-1] = '\0'; 248 break; 249 250 case 'C': 251 exit(checkaccess(optarg)); 252 /* NOTREACHED */ 253 254 case 'd': 255 case 'v': /* deprecated */ 256 debug = 1; 257 break; 258 259 case 'l': 260 logging++; /* > 1 == extra logging */ 261 break; 262 263 case 't': 264 case 'T': 265 case 'u': 266 warnx("-%c has been deprecated in favour of ftpd.conf", 267 ch); 268 break; 269 270 default: 271 if (optopt == 'a' || optopt == 'C') 272 exit(1); 273 warnx("unknown flag -%c ignored", optopt); 274 break; 275 } 276 } 277 278 /* 279 * LOG_NDELAY sets up the logging connection immediately, 280 * necessary for anonymous ftp's that chroot and can't do it later. 281 */ 282 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 283 addrlen = sizeof(his_addr); 284 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 285 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 286 exit(1); 287 } 288 addrlen = sizeof(ctrl_addr); 289 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 290 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 291 exit(1); 292 } 293 #ifdef IP_TOS 294 tos = IPTOS_LOWDELAY; 295 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 296 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 297 #endif 298 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 299 300 /* set this here so klogin can use it... */ 301 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 302 303 (void) freopen(_PATH_DEVNULL, "w", stderr); 304 (void) signal(SIGPIPE, lostconn); 305 (void) signal(SIGCHLD, SIG_IGN); 306 if ((long)signal(SIGURG, myoob) < 0) 307 syslog(LOG_ERR, "signal: %m"); 308 309 /* Try to handle urgent data inline */ 310 #ifdef SO_OOBINLINE 311 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 312 syslog(LOG_ERR, "setsockopt: %m"); 313 #endif 314 315 #ifdef F_SETOWN 316 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 317 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 318 #endif 319 dolog(&his_addr); 320 /* 321 * Set up default state 322 */ 323 data = -1; 324 type = TYPE_A; 325 form = FORM_N; 326 stru = STRU_F; 327 mode = MODE_S; 328 tmpline[0] = '\0'; 329 330 #ifdef KERBEROS5 331 kerror = krb5_init_context(&kcontext); 332 if (kerror) { 333 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 334 error_message(kerror)); 335 exit(0); 336 } 337 #endif KERBEROS5 338 339 /* If logins are disabled, print out the message. */ 340 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 341 while (fgets(line, sizeof(line), fd) != NULL) { 342 if ((cp = strchr(line, '\n')) != NULL) 343 *cp = '\0'; 344 lreply(530, "%s", line); 345 } 346 (void) fflush(stdout); 347 (void) fclose(fd); 348 reply(530, "System not available."); 349 exit(0); 350 } 351 if ((fd = fopen(conffilename(_PATH_FTPWELCOME), "r")) != NULL) { 352 while (fgets(line, sizeof(line), fd) != NULL) { 353 if ((cp = strchr(line, '\n')) != NULL) 354 *cp = '\0'; 355 lreply(220, "%s", line); 356 } 357 (void) fflush(stdout); 358 (void) fclose(fd); 359 /* reply(220,) must follow */ 360 } 361 (void) gethostname(hostname, sizeof(hostname)); 362 reply(220, "%s FTP server (%s) ready.", hostname, version); 363 (void) setjmp(errcatch); 364 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 365 for (;;) 366 (void) yyparse(); 367 /* NOTREACHED */ 368 } 369 370 static void 371 lostconn(signo) 372 int signo; 373 { 374 375 if (debug) 376 syslog(LOG_DEBUG, "lost connection"); 377 dologout(1); 378 } 379 380 /* 381 * Helper function for sgetpwnam(). 382 */ 383 static char * 384 sgetsave(s) 385 char *s; 386 { 387 char *new = malloc((unsigned) strlen(s) + 1); 388 389 if (new == NULL) { 390 perror_reply(421, "Local resource failure: malloc"); 391 dologout(1); 392 /* NOTREACHED */ 393 } 394 (void) strcpy(new, s); 395 return (new); 396 } 397 398 /* 399 * Save the result of a getpwnam. Used for USER command, since 400 * the data returned must not be clobbered by any other command 401 * (e.g., globbing). 402 */ 403 static struct passwd * 404 sgetpwnam(name) 405 char *name; 406 { 407 static struct passwd save; 408 struct passwd *p; 409 410 if ((p = getpwnam(name)) == NULL) 411 return (p); 412 if (save.pw_name) { 413 free(save.pw_name); 414 free(save.pw_passwd); 415 free(save.pw_gecos); 416 free(save.pw_dir); 417 free(save.pw_shell); 418 } 419 save = *p; 420 save.pw_name = sgetsave(p->pw_name); 421 save.pw_passwd = sgetsave(p->pw_passwd); 422 save.pw_gecos = sgetsave(p->pw_gecos); 423 save.pw_dir = sgetsave(p->pw_dir); 424 save.pw_shell = sgetsave(p->pw_shell); 425 return (&save); 426 } 427 428 static int login_attempts; /* number of failed login attempts */ 429 static int askpasswd; /* had user command, ask for passwd */ 430 static char curname[10]; /* current USER name */ 431 432 /* 433 * USER command. 434 * Sets global passwd pointer pw if named account exists and is acceptable; 435 * sets askpasswd if a PASS command is expected. If logged in previously, 436 * need to reset state. If name is "ftp" or "anonymous", the name is not in 437 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 438 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 439 * requesting login privileges. Disallow anyone who does not have a standard 440 * shell as returned by getusershell(). Disallow anyone mentioned in the file 441 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 442 */ 443 void 444 user(name) 445 char *name; 446 { 447 if (logged_in) { 448 if (guest) { 449 reply(530, "Can't change user from guest login."); 450 return; 451 } else if (dochroot) { 452 reply(530, "Can't change user from chroot user."); 453 return; 454 } 455 end_login(); 456 } 457 458 #if defined(KERBEROS) || defined(KERBEROS5) 459 kdestroy(); 460 #endif 461 462 guest = 0; 463 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 464 if (checkaccess("ftp") || checkaccess("anonymous")) 465 reply(530, "User %s access denied.", name); 466 else if ((pw = sgetpwnam("ftp")) != NULL) { 467 guest = 1; 468 askpasswd = 1; 469 reply(331, 470 "Guest login ok, type your name as password."); 471 } else 472 reply(530, "User %s unknown.", name); 473 if (!askpasswd && logging) 474 syslog(LOG_NOTICE, 475 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 476 return; 477 } 478 479 pw = sgetpwnam(name); 480 if (logging) 481 strncpy(curname, name, sizeof(curname)-1); 482 483 #ifdef SKEY 484 if (skey_haskey(name) == 0) { 485 char *myskey; 486 487 myskey = skey_keyinfo(name); 488 reply(331, "Password [%s] required for %s.", 489 myskey ? myskey : "error getting challenge", name); 490 } else 491 #endif 492 reply(331, "Password required for %s.", name); 493 494 askpasswd = 1; 495 /* 496 * Delay before reading passwd after first failed 497 * attempt to slow down passwd-guessing programs. 498 */ 499 if (login_attempts) 500 sleep((unsigned) login_attempts); 501 } 502 503 /* 504 * Check if a user is in the file "fname" 505 */ 506 static int 507 checkuser(fname, name) 508 char *fname; 509 char *name; 510 { 511 FILE *fd; 512 int found = 0; 513 char *p, line[BUFSIZ]; 514 515 if ((fd = fopen(fname, "r")) != NULL) { 516 while (fgets(line, sizeof(line), fd) != NULL) 517 if ((p = strchr(line, '\n')) != NULL) { 518 *p = '\0'; 519 if (line[0] == '#') 520 continue; 521 if (strcmp(line, name) == 0) { 522 found = 1; 523 break; 524 } 525 } 526 (void) fclose(fd); 527 } 528 return (found); 529 } 530 531 /* 532 * Determine whether a user has access, based on information in 533 * _PATH_FTPUSERS. Each line is a shell-style glob followed by 534 * `allow' or `deny' (with deny being the default if anything but 535 * `allow', or nothing at all, is specified). 536 * 537 * Each glob is matched against the username in turn, and the first 538 * match found is used. If no match is found, access is allowed. 539 * 540 * Any line starting with `#' is considered a comment and ignored. 541 * 542 * This is probably not the best way to do this, but it preserves 543 * the old semantics where if a user was listed in the file he was 544 * denied, otherwise he was allowed. 545 * 546 * There is one change in the semantics, however; ftpd will now `fail 547 * safe' and deny all access if there's no /etc/ftpusers file. 548 * 549 * Return 1 if the user is denied, or 0 if he is allowed. 550 */ 551 static int 552 checkaccess(name) 553 char *name; 554 { 555 #define ALLOWED 0 556 #define NOT_ALLOWED 1 557 FILE *fd; 558 int retval = ALLOWED; 559 char *glob, *perm, line[BUFSIZ]; 560 561 if ((fd = fopen(conffilename(_PATH_FTPUSERS), "r")) == NULL) 562 return NOT_ALLOWED; 563 564 while (fgets(line, sizeof(line), fd) != NULL) { 565 glob = strtok(line, " \t\n"); 566 if (glob[0] == '#') 567 continue; 568 perm = strtok(NULL, " \t\n"); 569 if (fnmatch(glob, name, 0) == 0) { 570 if (perm != NULL && strcmp(perm, "allow") == 0) 571 retval = ALLOWED; 572 else 573 retval = NOT_ALLOWED; 574 break; 575 } 576 } 577 (void) fclose(fd); 578 return (retval); 579 } 580 #undef ALLOWED 581 #undef NOT_ALLOWED 582 583 /* 584 * Terminate login as previous user, if any, resetting state; 585 * used when USER command is given or login fails. 586 */ 587 static void 588 end_login() 589 { 590 591 (void) seteuid((uid_t)0); 592 if (logged_in) 593 logwtmp(ttyline, "", ""); 594 pw = NULL; 595 logged_in = 0; 596 guest = 0; 597 dochroot = 0; 598 } 599 600 void 601 pass(passwd) 602 char *passwd; 603 { 604 int rval; 605 FILE *fd; 606 char *cp, *shell; 607 608 if (logged_in || askpasswd == 0) { 609 reply(503, "Login with USER first."); 610 return; 611 } 612 askpasswd = 0; 613 if (!guest) { /* "ftp" is only account allowed no password */ 614 if (pw == NULL) { 615 rval = 1; /* failure below */ 616 goto skip; 617 } 618 #ifdef KERBEROS 619 if (klogin(pw, "", hostname, passwd) == 0) { 620 rval = 0; 621 goto skip; 622 } 623 #endif 624 #ifdef KERBEROS5 625 if (klogin(pw, "", hostname, passwd) == 0) { 626 rval = 0; 627 goto skip; 628 } 629 #endif 630 #ifdef SKEY 631 if (skey_haskey(pw->pw_name) == 0 && 632 skey_passcheck(pw->pw_name, passwd) != -1) { 633 rval = 0; 634 goto skip; 635 } 636 #endif 637 if (*pw->pw_passwd != '\0' && 638 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 639 rval = 0; 640 goto skip; 641 } 642 rval = 1; 643 644 skip: 645 /* 646 * If rval == 1, the user failed the authentication check 647 * above. If rval == 0, either Kerberos or local authentication 648 * succeeded. 649 */ 650 if (rval) { 651 reply(530, "Login incorrect."); 652 if (logging) { 653 syslog(LOG_NOTICE, 654 "FTP LOGIN FAILED FROM %s", remotehost); 655 syslog(LOG_AUTHPRIV | LOG_NOTICE, 656 "FTP LOGIN FAILED FROM %s, %s", 657 remotehost, curname); 658 } 659 pw = NULL; 660 if (login_attempts++ >= 5) { 661 syslog(LOG_NOTICE, 662 "repeated login failures from %s", 663 remotehost); 664 exit(0); 665 } 666 return; 667 } 668 } 669 670 /* password was ok; see if anything else prevents login */ 671 if (checkaccess(pw->pw_name)) { 672 reply(530, "User %s may not use FTP.", pw->pw_name); 673 if (logging) 674 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 675 remotehost, pw->pw_name); 676 pw = (struct passwd *) NULL; 677 return; 678 } 679 /* check for valid shell, if not guest user */ 680 if ((shell = pw->pw_shell) == NULL || *shell == 0) 681 shell = _PATH_BSHELL; 682 while ((cp = getusershell()) != NULL) 683 if (strcmp(cp, shell) == 0) 684 break; 685 endusershell(); 686 if (cp == NULL && guest == 0) { 687 reply(530, "User %s may not use FTP (invalid shell).", 688 pw->pw_name); 689 if (logging) 690 syslog(LOG_NOTICE, 691 "FTP LOGIN REFUSED FROM %s, %s", 692 remotehost, pw->pw_name); 693 pw = (struct passwd *) NULL; 694 return; 695 } 696 697 login_attempts = 0; /* this time successful */ 698 if (setegid((gid_t)pw->pw_gid) < 0) { 699 reply(550, "Can't set gid."); 700 return; 701 } 702 (void) initgroups(pw->pw_name, pw->pw_gid); 703 704 /* open wtmp before chroot */ 705 logwtmp(ttyline, pw->pw_name, remotehost); 706 logged_in = 1; 707 708 dochroot = checkuser(conffilename(_PATH_FTPCHROOT), pw->pw_name); 709 710 /* parse ftpd.conf, setting up various parameters */ 711 if (guest) 712 parse_conf(CLASS_GUEST); 713 else if (dochroot) 714 parse_conf(CLASS_CHROOT); 715 else 716 parse_conf(CLASS_REAL); 717 718 if (guest) { 719 /* 720 * We MUST do a chdir() after the chroot. Otherwise 721 * the old current directory will be accessible as "." 722 * outside the new root! 723 */ 724 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 725 chdir("/") < 0) { 726 reply(550, "Can't set guest privileges."); 727 goto bad; 728 } 729 } else if (dochroot) { 730 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 731 reply(550, "Can't change root."); 732 goto bad; 733 } 734 } else if (chdir(pw->pw_dir) < 0) { 735 if (chdir("/") < 0) { 736 reply(530, "User %s: can't change directory to %s.", 737 pw->pw_name, pw->pw_dir); 738 goto bad; 739 } else 740 lreply(230, "No directory! Logging in with home=/"); 741 } 742 if (seteuid((uid_t)pw->pw_uid) < 0) { 743 reply(550, "Can't set uid."); 744 goto bad; 745 } 746 /* 747 * Display a login message, if it exists. 748 * N.B. reply(230,) must follow the message. 749 */ 750 if ((fd = fopen(conffilename(_PATH_FTPLOGINMESG), "r")) != NULL) { 751 char *cp, line[LINE_MAX]; 752 753 while (fgets(line, sizeof(line), fd) != NULL) { 754 if ((cp = strchr(line, '\n')) != NULL) 755 *cp = '\0'; 756 lreply(230, "%s", line); 757 } 758 (void) fflush(stdout); 759 (void) fclose(fd); 760 } 761 show_chdir_messages(230); 762 if (guest) { 763 reply(230, "Guest login ok, access restrictions apply."); 764 #ifdef HASSETPROCTITLE 765 snprintf(proctitle, sizeof(proctitle), 766 "%s: anonymous/%.*s", remotehost, 767 (int) (sizeof(proctitle) - sizeof(remotehost) - 768 sizeof(": anonymous/")), passwd); 769 setproctitle(proctitle); 770 #endif /* HASSETPROCTITLE */ 771 if (logging) 772 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 773 remotehost, passwd); 774 } else { 775 reply(230, "User %s logged in.", pw->pw_name); 776 #ifdef HASSETPROCTITLE 777 snprintf(proctitle, sizeof(proctitle), 778 "%s: %s", remotehost, pw->pw_name); 779 setproctitle(proctitle); 780 #endif /* HASSETPROCTITLE */ 781 if (logging) 782 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 783 remotehost, pw->pw_name); 784 } 785 (void) umask(curclass.umask); 786 return; 787 bad: 788 /* Forget all about it... */ 789 end_login(); 790 } 791 792 void 793 retrieve(cmd, name) 794 char *cmd, *name; 795 { 796 FILE *fin = NULL, *dout; 797 struct stat st; 798 int (*closefunc) __P((FILE *)) = NULL; 799 int log; 800 801 log = (cmd == 0); 802 if (cmd == 0) { 803 fin = fopen(name, "r"), closefunc = fclose; 804 if (fin == NULL) 805 cmd = do_conversion(name); 806 } 807 if (cmd) { 808 char line[BUFSIZ]; 809 810 (void)snprintf(line, sizeof(line), cmd, name), name = line; 811 fin = ftpd_popen(line, "r", 1), closefunc = ftpd_pclose; 812 st.st_size = -1; 813 st.st_blksize = BUFSIZ; 814 } 815 if (fin == NULL) { 816 if (errno != 0) { 817 perror_reply(550, name); 818 if (log) { 819 LOGCMD("get", name); 820 } 821 } 822 return; 823 } 824 byte_count = -1; 825 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 826 reply(550, "%s: not a plain file.", name); 827 goto done; 828 } 829 if (restart_point) { 830 if (type == TYPE_A) { 831 off_t i, n; 832 int c; 833 834 n = restart_point; 835 i = 0; 836 while (i++ < n) { 837 if ((c=getc(fin)) == EOF) { 838 perror_reply(550, name); 839 goto done; 840 } 841 if (c == '\n') 842 i++; 843 } 844 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 845 perror_reply(550, name); 846 goto done; 847 } 848 } 849 dout = dataconn(name, st.st_size, "w"); 850 if (dout == NULL) 851 goto done; 852 send_data(fin, dout, st.st_blksize); 853 (void) fclose(dout); 854 data = -1; 855 pdata = -1; 856 done: 857 if (log) 858 LOGBYTES("get", name, byte_count); 859 (*closefunc)(fin); 860 } 861 862 void 863 store(name, mode, unique) 864 char *name, *mode; 865 int unique; 866 { 867 FILE *fout, *din; 868 struct stat st; 869 int (*closefunc) __P((FILE *)); 870 871 if (unique && stat(name, &st) == 0 && 872 (name = gunique(name)) == NULL) { 873 LOGCMD(*mode == 'w' ? "put" : "append", name); 874 return; 875 } 876 877 if (restart_point) 878 mode = "r+"; 879 fout = fopen(name, mode); 880 closefunc = fclose; 881 if (fout == NULL) { 882 perror_reply(553, name); 883 LOGCMD(*mode == 'w' ? "put" : "append", name); 884 return; 885 } 886 byte_count = -1; 887 if (restart_point) { 888 if (type == TYPE_A) { 889 off_t i, n; 890 int c; 891 892 n = restart_point; 893 i = 0; 894 while (i++ < n) { 895 if ((c=getc(fout)) == EOF) { 896 perror_reply(550, name); 897 goto done; 898 } 899 if (c == '\n') 900 i++; 901 } 902 /* 903 * We must do this seek to "current" position 904 * because we are changing from reading to 905 * writing. 906 */ 907 if (fseek(fout, 0L, SEEK_CUR) < 0) { 908 perror_reply(550, name); 909 goto done; 910 } 911 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 912 perror_reply(550, name); 913 goto done; 914 } 915 } 916 din = dataconn(name, (off_t)-1, "r"); 917 if (din == NULL) 918 goto done; 919 if (receive_data(din, fout) == 0) { 920 if (unique) 921 reply(226, "Transfer complete (unique file name:%s).", 922 name); 923 else 924 reply(226, "Transfer complete."); 925 } 926 (void) fclose(din); 927 data = -1; 928 pdata = -1; 929 done: 930 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 931 (*closefunc)(fout); 932 } 933 934 static FILE * 935 getdatasock(mode) 936 char *mode; 937 { 938 int on = 1, s, t, tries; 939 940 if (data >= 0) 941 return (fdopen(data, mode)); 942 (void) seteuid((uid_t)0); 943 s = socket(AF_INET, SOCK_STREAM, 0); 944 if (s < 0) 945 goto bad; 946 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 947 (char *) &on, sizeof(on)) < 0) 948 goto bad; 949 /* anchor socket to avoid multi-homing problems */ 950 data_source.sin_len = sizeof(struct sockaddr_in); 951 data_source.sin_family = AF_INET; 952 data_source.sin_addr = ctrl_addr.sin_addr; 953 for (tries = 1; ; tries++) { 954 if (bind(s, (struct sockaddr *)&data_source, 955 sizeof(data_source)) >= 0) 956 break; 957 if (errno != EADDRINUSE || tries > 10) 958 goto bad; 959 sleep(tries); 960 } 961 (void) seteuid((uid_t)pw->pw_uid); 962 #ifdef IP_TOS 963 on = IPTOS_THROUGHPUT; 964 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 965 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 966 #endif 967 return (fdopen(s, mode)); 968 bad: 969 /* Return the real value of errno (close may change it) */ 970 t = errno; 971 (void) seteuid((uid_t)pw->pw_uid); 972 (void) close(s); 973 errno = t; 974 return (NULL); 975 } 976 977 static FILE * 978 dataconn(name, size, mode) 979 char *name; 980 off_t size; 981 char *mode; 982 { 983 char sizebuf[32]; 984 FILE *file; 985 int retry = 0, tos; 986 987 file_size = size; 988 byte_count = 0; 989 if (size != (off_t) -1) 990 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 991 (long long)size); 992 else 993 sizebuf[0] = '\0'; 994 if (pdata >= 0) { 995 struct sockaddr_in from; 996 int s, fromlen = sizeof(from); 997 998 (void) alarm(curclass.timeout); 999 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1000 (void) alarm(0); 1001 if (s < 0) { 1002 reply(425, "Can't open data connection."); 1003 (void) close(pdata); 1004 pdata = -1; 1005 return (NULL); 1006 } 1007 (void) close(pdata); 1008 pdata = s; 1009 #ifdef IP_TOS 1010 tos = IPTOS_THROUGHPUT; 1011 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1012 sizeof(int)); 1013 #endif 1014 reply(150, "Opening %s mode data connection for '%s'%s.", 1015 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1016 return (fdopen(pdata, mode)); 1017 } 1018 if (data >= 0) { 1019 reply(125, "Using existing data connection for '%s'%s.", 1020 name, sizebuf); 1021 usedefault = 1; 1022 return (fdopen(data, mode)); 1023 } 1024 if (usedefault) 1025 data_dest = his_addr; 1026 usedefault = 1; 1027 file = getdatasock(mode); 1028 if (file == NULL) { 1029 reply(425, "Can't create data socket (%s,%d): %s.", 1030 inet_ntoa(data_source.sin_addr), 1031 ntohs(data_source.sin_port), strerror(errno)); 1032 return (NULL); 1033 } 1034 data = fileno(file); 1035 while (connect(data, (struct sockaddr *)&data_dest, 1036 sizeof(data_dest)) < 0) { 1037 if (errno == EADDRINUSE && retry < swaitmax) { 1038 sleep((unsigned) swaitint); 1039 retry += swaitint; 1040 continue; 1041 } 1042 perror_reply(425, "Can't build data connection"); 1043 (void) fclose(file); 1044 data = -1; 1045 return (NULL); 1046 } 1047 reply(150, "Opening %s mode data connection for '%s'%s.", 1048 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1049 return (file); 1050 } 1051 1052 /* 1053 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1054 * encapsulation of the data subject * to Mode, Structure, and Type. 1055 * 1056 * NB: Form isn't handled. 1057 */ 1058 static void 1059 send_data(instr, outstr, blksize) 1060 FILE *instr, *outstr; 1061 off_t blksize; 1062 { 1063 int c, cnt, filefd, netfd; 1064 char *buf; 1065 1066 transflag++; 1067 if (setjmp(urgcatch)) { 1068 transflag = 0; 1069 return; 1070 } 1071 1072 switch (type) { 1073 1074 case TYPE_A: 1075 while ((c = getc(instr)) != EOF) { 1076 byte_count++; 1077 if (c == '\n') { 1078 if (ferror(outstr)) 1079 goto data_err; 1080 (void) putc('\r', outstr); 1081 } 1082 (void) putc(c, outstr); 1083 } 1084 fflush(outstr); 1085 transflag = 0; 1086 if (ferror(instr)) 1087 goto file_err; 1088 if (ferror(outstr)) 1089 goto data_err; 1090 reply(226, "Transfer complete."); 1091 return; 1092 1093 case TYPE_I: 1094 case TYPE_L: 1095 if ((buf = malloc((u_int)blksize)) == NULL) { 1096 transflag = 0; 1097 perror_reply(451, "Local resource failure: malloc"); 1098 return; 1099 } 1100 netfd = fileno(outstr); 1101 filefd = fileno(instr); 1102 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1103 write(netfd, buf, cnt) == cnt) 1104 byte_count += cnt; 1105 transflag = 0; 1106 (void)free(buf); 1107 if (cnt != 0) { 1108 if (cnt < 0) 1109 goto file_err; 1110 goto data_err; 1111 } 1112 reply(226, "Transfer complete."); 1113 return; 1114 default: 1115 transflag = 0; 1116 reply(550, "Unimplemented TYPE %d in send_data", type); 1117 return; 1118 } 1119 1120 data_err: 1121 transflag = 0; 1122 perror_reply(426, "Data connection"); 1123 return; 1124 1125 file_err: 1126 transflag = 0; 1127 perror_reply(551, "Error on input file"); 1128 } 1129 1130 /* 1131 * Transfer data from peer to "outstr" using the appropriate encapulation of 1132 * the data subject to Mode, Structure, and Type. 1133 * 1134 * N.B.: Form isn't handled. 1135 */ 1136 static int 1137 receive_data(instr, outstr) 1138 FILE *instr, *outstr; 1139 { 1140 int c, cnt, bare_lfs; 1141 char buf[BUFSIZ]; 1142 #ifdef __GNUC__ 1143 (void) &bare_lfs; 1144 #endif 1145 1146 bare_lfs = 0; 1147 transflag++; 1148 if (setjmp(urgcatch)) { 1149 transflag = 0; 1150 return (-1); 1151 } 1152 1153 switch (type) { 1154 1155 case TYPE_I: 1156 case TYPE_L: 1157 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1158 if (write(fileno(outstr), buf, cnt) != cnt) 1159 goto file_err; 1160 byte_count += cnt; 1161 } 1162 if (cnt < 0) 1163 goto data_err; 1164 transflag = 0; 1165 return (0); 1166 1167 case TYPE_E: 1168 reply(553, "TYPE E not implemented."); 1169 transflag = 0; 1170 return (-1); 1171 1172 case TYPE_A: 1173 while ((c = getc(instr)) != EOF) { 1174 byte_count++; 1175 if (c == '\n') 1176 bare_lfs++; 1177 while (c == '\r') { 1178 if (ferror(outstr)) 1179 goto data_err; 1180 if ((c = getc(instr)) != '\n') { 1181 (void) putc ('\r', outstr); 1182 if (c == '\0' || c == EOF) 1183 goto contin2; 1184 } 1185 } 1186 (void) putc(c, outstr); 1187 contin2: ; 1188 } 1189 fflush(outstr); 1190 if (ferror(instr)) 1191 goto data_err; 1192 if (ferror(outstr)) 1193 goto file_err; 1194 transflag = 0; 1195 if (bare_lfs) { 1196 lreply(226, 1197 "WARNING! %d bare linefeeds received in ASCII mode", 1198 bare_lfs); 1199 (void)printf(" File may not have transferred correctly.\r\n"); 1200 } 1201 return (0); 1202 default: 1203 reply(550, "Unimplemented TYPE %d in receive_data", type); 1204 transflag = 0; 1205 return (-1); 1206 } 1207 1208 data_err: 1209 transflag = 0; 1210 perror_reply(426, "Data Connection"); 1211 return (-1); 1212 1213 file_err: 1214 transflag = 0; 1215 perror_reply(452, "Error writing file"); 1216 return (-1); 1217 } 1218 1219 void 1220 statfilecmd(filename) 1221 char *filename; 1222 { 1223 FILE *fin; 1224 int c; 1225 char line[LINE_MAX]; 1226 1227 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1228 fin = ftpd_popen(line, "r", 0); 1229 lreply(211, "status of %s:", filename); 1230 while ((c = getc(fin)) != EOF) { 1231 if (c == '\n') { 1232 if (ferror(stdout)){ 1233 perror_reply(421, "control connection"); 1234 (void) ftpd_pclose(fin); 1235 dologout(1); 1236 /* NOTREACHED */ 1237 } 1238 if (ferror(fin)) { 1239 perror_reply(551, filename); 1240 (void) ftpd_pclose(fin); 1241 return; 1242 } 1243 (void) putc('\r', stdout); 1244 } 1245 (void) putc(c, stdout); 1246 } 1247 (void) ftpd_pclose(fin); 1248 reply(211, "End of Status"); 1249 } 1250 1251 void 1252 statcmd() 1253 { 1254 struct sockaddr_in *sin; 1255 u_char *a, *p; 1256 1257 lreply(211, "%s FTP server status:", hostname); 1258 lreply(211, "%s", version); 1259 if (isdigit(remotehost[0])) 1260 lreply(211, "Connected to %s", remotehost); 1261 else 1262 lreply(211, "Connected to %s (%s)", remotehost, 1263 inet_ntoa(his_addr.sin_addr)); 1264 if (logged_in) { 1265 if (guest) 1266 lreply(211, "Logged in anonymously"); 1267 else 1268 lreply(211, "Logged in as %s", pw->pw_name); 1269 } else if (askpasswd) 1270 lreply(211, "Waiting for password"); 1271 else 1272 lreply(211, "Waiting for user name"); 1273 printf("211- TYPE: %s", typenames[type]); 1274 if (type == TYPE_A || type == TYPE_E) 1275 printf(", FORM: %s", formnames[form]); 1276 if (type == TYPE_L) 1277 #if NBBY == 8 1278 printf(" %d", NBBY); 1279 #else 1280 printf(" %d", bytesize); /* need definition! */ 1281 #endif 1282 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1283 strunames[stru], modenames[mode]); 1284 if (data != -1) 1285 lreply(211, "Data connection open"); 1286 else if (pdata != -1) { 1287 printf("211- in Passive mode"); 1288 sin = &pasv_addr; 1289 goto printaddr; 1290 } else if (usedefault == 0) { 1291 printf("211- PORT"); 1292 sin = &data_dest; 1293 printaddr: 1294 a = (u_char *) &sin->sin_addr; 1295 p = (u_char *) &sin->sin_port; 1296 #define UC(b) (((int) b) & 0xff) 1297 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1298 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1299 #undef UC 1300 } else 1301 lreply(211, "No data connection"); 1302 1303 if (logged_in) { 1304 struct ftpconv *cp; 1305 1306 lreply(211, ""); 1307 lreply(211, "Class: %s", curclass.classname); 1308 lreply(211, "Check PORT commands: %sabled", 1309 curclass.checkportcmd ? "en" : "dis"); 1310 if (curclass.display) 1311 lreply(211, "Display file: %s", curclass.display); 1312 if (curclass.notify) 1313 lreply(211, "Notify fileglob: %s", curclass.notify); 1314 lreply(211, "Idle timeout: %d, maximum timeout: %d", 1315 curclass.timeout, curclass.maxtimeout); 1316 lreply(211, "DELE, MKD, RMD, UMASK, CHMOD commands: %sabled", 1317 curclass.modify ? "en" : "dis"); 1318 lreply(211, "Umask: %.04o", curclass.umask); 1319 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1320 if (cp->suffix == NULL || cp->types == NULL || 1321 cp->command == NULL) 1322 continue; 1323 lreply(211, 1324 "Conversion: %s [%s] disable: %s, command: %s", 1325 cp->suffix, cp->types, cp->disable, cp->command); 1326 } 1327 } 1328 1329 reply(211, "End of status"); 1330 } 1331 1332 void 1333 fatal(s) 1334 char *s; 1335 { 1336 1337 reply(451, "Error in server: %s\n", s); 1338 reply(221, "Closing connection due to server error."); 1339 dologout(0); 1340 /* NOTREACHED */ 1341 } 1342 1343 void 1344 #if __STDC__ 1345 reply(int n, const char *fmt, ...) 1346 #else 1347 reply(n, fmt, va_alist) 1348 int n; 1349 char *fmt; 1350 va_dcl 1351 #endif 1352 { 1353 va_list ap; 1354 #if __STDC__ 1355 va_start(ap, fmt); 1356 #else 1357 va_start(ap); 1358 #endif 1359 (void)printf("%d ", n); 1360 (void)vprintf(fmt, ap); 1361 (void)printf("\r\n"); 1362 (void)fflush(stdout); 1363 if (debug) { 1364 syslog(LOG_DEBUG, "<--- %d ", n); 1365 vsyslog(LOG_DEBUG, fmt, ap); 1366 } 1367 } 1368 1369 void 1370 #if __STDC__ 1371 lreply(int n, const char *fmt, ...) 1372 #else 1373 lreply(n, fmt, va_alist) 1374 int n; 1375 char *fmt; 1376 va_dcl 1377 #endif 1378 { 1379 va_list ap; 1380 #if __STDC__ 1381 va_start(ap, fmt); 1382 #else 1383 va_start(ap); 1384 #endif 1385 (void)printf("%d- ", n); 1386 (void)vprintf(fmt, ap); 1387 (void)printf("\r\n"); 1388 (void)fflush(stdout); 1389 if (debug) { 1390 syslog(LOG_DEBUG, "<--- %d- ", n); 1391 vsyslog(LOG_DEBUG, fmt, ap); 1392 } 1393 } 1394 1395 static void 1396 ack(s) 1397 char *s; 1398 { 1399 1400 reply(250, "%s command successful.", s); 1401 } 1402 1403 void 1404 nack(s) 1405 char *s; 1406 { 1407 1408 reply(502, "%s command not implemented.", s); 1409 } 1410 1411 /* ARGSUSED */ 1412 void 1413 yyerror(s) 1414 char *s; 1415 { 1416 char *cp; 1417 1418 if ((cp = strchr(cbuf,'\n')) != NULL) 1419 *cp = '\0'; 1420 reply(500, "'%s': command not understood.", cbuf); 1421 } 1422 1423 void 1424 delete(name) 1425 char *name; 1426 { 1427 1428 LOGCMD("delete", name); 1429 if (remove(name) < 0) 1430 perror_reply(550, name); 1431 else 1432 ack("DELE"); 1433 } 1434 1435 void 1436 cwd(path) 1437 char *path; 1438 { 1439 1440 if (chdir(path) < 0) 1441 perror_reply(550, path); 1442 else { 1443 show_chdir_messages(250); 1444 ack("CWD"); 1445 } 1446 } 1447 1448 static void 1449 replydirname(name, message) 1450 const char *name, *message; 1451 { 1452 char npath[MAXPATHLEN + 1]; 1453 int i; 1454 1455 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 1456 npath[i] = *name; 1457 if (*name == '"') 1458 npath[++i] = '"'; 1459 } 1460 npath[i] = '\0'; 1461 reply(257, "\"%s\" %s", npath, message); 1462 } 1463 1464 void 1465 makedir(name) 1466 char *name; 1467 { 1468 1469 LOGCMD("mkdir", name); 1470 if (mkdir(name, 0777) < 0) 1471 perror_reply(550, name); 1472 else 1473 replydirname(name, "directory created."); 1474 } 1475 1476 void 1477 removedir(name) 1478 char *name; 1479 { 1480 1481 LOGCMD("rmdir", name); 1482 if (rmdir(name) < 0) 1483 perror_reply(550, name); 1484 else 1485 ack("RMD"); 1486 } 1487 1488 void 1489 pwd() 1490 { 1491 char path[MAXPATHLEN + 1]; 1492 1493 if (getcwd(path, sizeof(path) - 1) == NULL) 1494 reply(550, "%s.", path); 1495 else 1496 replydirname(path, "is the current directory."); 1497 } 1498 1499 char * 1500 renamefrom(name) 1501 char *name; 1502 { 1503 struct stat st; 1504 1505 if (stat(name, &st) < 0) { 1506 perror_reply(550, name); 1507 return ((char *)0); 1508 } 1509 reply(350, "File exists, ready for destination name"); 1510 return (name); 1511 } 1512 1513 void 1514 renamecmd(from, to) 1515 char *from, *to; 1516 { 1517 1518 LOGCMD2("rename", from, to); 1519 if (rename(from, to) < 0) 1520 perror_reply(550, "rename"); 1521 else 1522 ack("RNTO"); 1523 } 1524 1525 static void 1526 dolog(sin) 1527 struct sockaddr_in *sin; 1528 { 1529 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1530 sizeof(struct in_addr), AF_INET); 1531 1532 if (hp) 1533 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1534 else 1535 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1536 sizeof(remotehost)); 1537 #ifdef HASSETPROCTITLE 1538 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1539 setproctitle(proctitle); 1540 #endif /* HASSETPROCTITLE */ 1541 1542 if (logging) 1543 syslog(LOG_INFO, "connection from %s", remotehost); 1544 } 1545 1546 /* 1547 * Record logout in wtmp file 1548 * and exit with supplied status. 1549 */ 1550 void 1551 dologout(status) 1552 int status; 1553 { 1554 /* 1555 * Prevent reception of SIGURG from resulting in a resumption 1556 * back to the main program loop. 1557 */ 1558 transflag = 0; 1559 1560 if (logged_in) { 1561 (void) seteuid((uid_t)0); 1562 logwtmp(ttyline, "", ""); 1563 #ifdef KERBEROS 1564 if (!notickets && krbtkfile_env) 1565 unlink(krbtkfile_env); 1566 #endif 1567 } 1568 /* beware of flushing buffers after a SIGPIPE */ 1569 _exit(status); 1570 } 1571 1572 static void 1573 myoob(signo) 1574 int signo; 1575 { 1576 char *cp; 1577 1578 /* only process if transfer occurring */ 1579 if (!transflag) 1580 return; 1581 cp = tmpline; 1582 if (getline(cp, 7, stdin) == NULL) { 1583 reply(221, "You could at least say goodbye."); 1584 dologout(0); 1585 } 1586 upper(cp); 1587 if (strcmp(cp, "ABOR\r\n") == 0) { 1588 tmpline[0] = '\0'; 1589 reply(426, "Transfer aborted. Data connection closed."); 1590 reply(226, "Abort successful"); 1591 longjmp(urgcatch, 1); 1592 } 1593 if (strcmp(cp, "STAT\r\n") == 0) { 1594 if (file_size != (off_t) -1) 1595 reply(213, "Status: %qd of %qd bytes transferred", 1596 byte_count, file_size); 1597 else 1598 reply(213, "Status: %qd bytes transferred", byte_count); 1599 } 1600 } 1601 1602 /* 1603 * Note: a response of 425 is not mentioned as a possible response to 1604 * the PASV command in RFC959. However, it has been blessed as 1605 * a legitimate response by Jon Postel in a telephone conversation 1606 * with Rick Adams on 25 Jan 89. 1607 */ 1608 void 1609 passive() 1610 { 1611 int len; 1612 char *p, *a; 1613 1614 pdata = socket(AF_INET, SOCK_STREAM, 0); 1615 if (pdata < 0 || !logged_in) { 1616 perror_reply(425, "Can't open passive connection"); 1617 return; 1618 } 1619 pasv_addr = ctrl_addr; 1620 pasv_addr.sin_port = 0; 1621 (void) seteuid((uid_t)0); 1622 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1623 (void) seteuid((uid_t)pw->pw_uid); 1624 goto pasv_error; 1625 } 1626 (void) seteuid((uid_t)pw->pw_uid); 1627 len = sizeof(pasv_addr); 1628 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1629 goto pasv_error; 1630 if (listen(pdata, 1) < 0) 1631 goto pasv_error; 1632 a = (char *) &pasv_addr.sin_addr; 1633 p = (char *) &pasv_addr.sin_port; 1634 1635 #define UC(b) (((int) b) & 0xff) 1636 1637 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1638 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1639 return; 1640 1641 pasv_error: 1642 (void) close(pdata); 1643 pdata = -1; 1644 perror_reply(425, "Can't open passive connection"); 1645 return; 1646 } 1647 1648 /* 1649 * Generate unique name for file with basename "local". 1650 * The file named "local" is already known to exist. 1651 * Generates failure reply on error. 1652 * 1653 * XXX this function should under go changes similar to 1654 * the mktemp(3)/mkstemp(3) changes. 1655 */ 1656 static char * 1657 gunique(local) 1658 char *local; 1659 { 1660 static char new[MAXPATHLEN]; 1661 struct stat st; 1662 int count, len; 1663 char *cp; 1664 1665 cp = strrchr(local, '/'); 1666 if (cp) 1667 *cp = '\0'; 1668 if (stat(cp ? local : ".", &st) < 0) { 1669 perror_reply(553, cp ? local : "."); 1670 return ((char *) 0); 1671 } 1672 if (cp) 1673 *cp = '/'; 1674 (void) strcpy(new, local); 1675 len = strlen(new); 1676 cp = new + len; 1677 *cp++ = '.'; 1678 for (count = 1; count < 100; count++) { 1679 (void)snprintf(cp, sizeof(new) - len - 2, "%d", count); 1680 if (stat(new, &st) < 0) 1681 return (new); 1682 } 1683 reply(452, "Unique file name cannot be created."); 1684 return (NULL); 1685 } 1686 1687 /* 1688 * Format and send reply containing system error number. 1689 */ 1690 void 1691 perror_reply(code, string) 1692 int code; 1693 char *string; 1694 { 1695 1696 reply(code, "%s: %s.", string, strerror(errno)); 1697 } 1698 1699 static char *onefile[] = { 1700 "", 1701 0 1702 }; 1703 1704 void 1705 send_file_list(whichf) 1706 char *whichf; 1707 { 1708 struct stat st; 1709 DIR *dirp = NULL; 1710 struct dirent *dir; 1711 FILE *dout = NULL; 1712 char **dirlist, *dirname; 1713 int simple = 0; 1714 int freeglob = 0; 1715 glob_t gl; 1716 #ifdef __GNUC__ 1717 (void) &dout; 1718 (void) &dirlist; 1719 (void) &simple; 1720 (void) &freeglob; 1721 #endif 1722 1723 if (strpbrk(whichf, "~{[*?") != NULL) { 1724 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1725 1726 memset(&gl, 0, sizeof(gl)); 1727 freeglob = 1; 1728 if (glob(whichf, flags, 0, &gl)) { 1729 reply(550, "not found"); 1730 goto out; 1731 } else if (gl.gl_pathc == 0) { 1732 errno = ENOENT; 1733 perror_reply(550, whichf); 1734 goto out; 1735 } 1736 dirlist = gl.gl_pathv; 1737 } else { 1738 onefile[0] = whichf; 1739 dirlist = onefile; 1740 simple = 1; 1741 } 1742 1743 if (setjmp(urgcatch)) { 1744 transflag = 0; 1745 goto out; 1746 } 1747 while ((dirname = *dirlist++) != NULL) { 1748 int trailingslash = 0; 1749 1750 if (stat(dirname, &st) < 0) { 1751 /* 1752 * If user typed "ls -l", etc, and the client 1753 * used NLST, do what the user meant. 1754 */ 1755 if (dirname[0] == '-' && *dirlist == NULL && 1756 transflag == 0) { 1757 retrieve("/bin/ls %s", dirname); 1758 goto out; 1759 } 1760 perror_reply(550, whichf); 1761 if (dout != NULL) { 1762 (void) fclose(dout); 1763 transflag = 0; 1764 data = -1; 1765 pdata = -1; 1766 } 1767 goto out; 1768 } 1769 1770 if (S_ISREG(st.st_mode)) { 1771 if (dout == NULL) { 1772 dout = dataconn("file list", (off_t)-1, "w"); 1773 if (dout == NULL) 1774 goto out; 1775 transflag++; 1776 } 1777 fprintf(dout, "%s%s\n", dirname, 1778 type == TYPE_A ? "\r" : ""); 1779 byte_count += strlen(dirname) + 1; 1780 continue; 1781 } else if (!S_ISDIR(st.st_mode)) 1782 continue; 1783 1784 if (dirname[strlen(dirname) - 1] == '/') 1785 trailingslash++; 1786 1787 if ((dirp = opendir(dirname)) == NULL) 1788 continue; 1789 1790 while ((dir = readdir(dirp)) != NULL) { 1791 char nbuf[MAXPATHLEN]; 1792 1793 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1794 continue; 1795 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1796 dir->d_namlen == 2) 1797 continue; 1798 1799 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 1800 trailingslash ? "" : "/", dir->d_name); 1801 1802 /* 1803 * We have to do a stat to ensure it's 1804 * not a directory or special file. 1805 */ 1806 if (simple || (stat(nbuf, &st) == 0 && 1807 S_ISREG(st.st_mode))) { 1808 if (dout == NULL) { 1809 dout = dataconn("file list", (off_t)-1, 1810 "w"); 1811 if (dout == NULL) 1812 goto out; 1813 transflag++; 1814 } 1815 if (nbuf[0] == '.' && nbuf[1] == '/') 1816 fprintf(dout, "%s%s\n", &nbuf[2], 1817 type == TYPE_A ? "\r" : ""); 1818 else 1819 fprintf(dout, "%s%s\n", nbuf, 1820 type == TYPE_A ? "\r" : ""); 1821 byte_count += strlen(nbuf) + 1; 1822 } 1823 } 1824 (void) closedir(dirp); 1825 } 1826 1827 if (dout == NULL) 1828 reply(550, "No files found."); 1829 else if (ferror(dout) != 0) 1830 perror_reply(550, "Data connection"); 1831 else 1832 reply(226, "Transfer complete."); 1833 1834 transflag = 0; 1835 if (dout != NULL) 1836 (void) fclose(dout); 1837 data = -1; 1838 pdata = -1; 1839 out: 1840 if (freeglob) { 1841 freeglob = 0; 1842 globfree(&gl); 1843 } 1844 } 1845 1846 char * 1847 conffilename(s) 1848 const char *s; 1849 { 1850 static char filename[MAXPATHLEN]; 1851 1852 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 1853 return filename; 1854 } 1855
Indexes created Tue Oct 14 08:09:56 GMT 2025