ftpd.c revision 1.45
1 /* $NetBSD: ftpd.c,v 1.45 1998/02/01 14:10:22 christos 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 1.45 1998/02/01 14:10:22 christos 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, *home; 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 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 646 rval = 2; 647 /* 648 * If rval > 0, the user failed the authentication check 649 * above. If rval == 0, either Kerberos or local authentication 650 * succeeded. 651 */ 652 if (rval) { 653 reply(530, rval == 2 ? "Password expired." : 654 "Login incorrect."); 655 if (logging) { 656 syslog(LOG_NOTICE, 657 "FTP LOGIN FAILED FROM %s", remotehost); 658 syslog(LOG_AUTHPRIV | LOG_NOTICE, 659 "FTP LOGIN FAILED FROM %s, %s", 660 remotehost, curname); 661 } 662 pw = NULL; 663 if (login_attempts++ >= 5) { 664 syslog(LOG_NOTICE, 665 "repeated login failures from %s", 666 remotehost); 667 exit(0); 668 } 669 return; 670 } 671 } 672 673 /* password was ok; see if anything else prevents login */ 674 if (checkaccess(pw->pw_name)) { 675 reply(530, "User %s may not use FTP.", pw->pw_name); 676 if (logging) 677 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 678 remotehost, pw->pw_name); 679 pw = (struct passwd *) NULL; 680 return; 681 } 682 /* check for valid shell, if not guest user */ 683 if ((shell = pw->pw_shell) == NULL || *shell == 0) 684 shell = _PATH_BSHELL; 685 while ((cp = getusershell()) != NULL) 686 if (strcmp(cp, shell) == 0) 687 break; 688 endusershell(); 689 if (cp == NULL && guest == 0) { 690 reply(530, "User %s may not use FTP.", pw->pw_name); 691 if (logging) 692 syslog(LOG_NOTICE, 693 "FTP LOGIN REFUSED FROM %s, %s", 694 remotehost, pw->pw_name); 695 pw = (struct passwd *) NULL; 696 return; 697 } 698 699 login_attempts = 0; /* this time successful */ 700 if (setegid((gid_t)pw->pw_gid) < 0) { 701 reply(550, "Can't set gid."); 702 return; 703 } 704 (void) initgroups(pw->pw_name, pw->pw_gid); 705 706 /* open wtmp before chroot */ 707 logwtmp(ttyline, pw->pw_name, remotehost); 708 logged_in = 1; 709 710 dochroot = checkuser(conffilename(_PATH_FTPCHROOT), pw->pw_name); 711 712 /* parse ftpd.conf, setting up various parameters */ 713 if (guest) 714 parse_conf(CLASS_GUEST); 715 else if (dochroot) 716 parse_conf(CLASS_CHROOT); 717 else 718 parse_conf(CLASS_REAL); 719 720 home = "/"; 721 if (guest) { 722 /* 723 * We MUST do a chdir() after the chroot. Otherwise 724 * the old current directory will be accessible as "." 725 * outside the new root! 726 */ 727 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 728 chdir("/") < 0) { 729 reply(550, "Can't set guest privileges."); 730 goto bad; 731 } 732 } else if (dochroot) { 733 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 734 reply(550, "Can't change root."); 735 goto bad; 736 } 737 } else if (chdir(pw->pw_dir) < 0) { 738 if (chdir("/") < 0) { 739 reply(530, "User %s: can't change directory to %s.", 740 pw->pw_name, pw->pw_dir); 741 goto bad; 742 } else 743 lreply(230, "No directory! Logging in with home=/"); 744 } else 745 home = pw->pw_dir; 746 if (seteuid((uid_t)pw->pw_uid) < 0) { 747 reply(550, "Can't set uid."); 748 goto bad; 749 } 750 setenv("HOME", home, 1); 751 752 753 /* 754 * Display a login message, if it exists. 755 * N.B. reply(230,) must follow the message. 756 */ 757 if ((fd = fopen(conffilename(_PATH_FTPLOGINMESG), "r")) != NULL) { 758 char *cp, line[LINE_MAX]; 759 760 while (fgets(line, sizeof(line), fd) != NULL) { 761 if ((cp = strchr(line, '\n')) != NULL) 762 *cp = '\0'; 763 lreply(230, "%s", line); 764 } 765 (void) fflush(stdout); 766 (void) fclose(fd); 767 } 768 show_chdir_messages(230); 769 if (guest) { 770 reply(230, "Guest login ok, access restrictions apply."); 771 #ifdef HASSETPROCTITLE 772 snprintf(proctitle, sizeof(proctitle), 773 "%s: anonymous/%.*s", remotehost, 774 (int) (sizeof(proctitle) - sizeof(remotehost) - 775 sizeof(": anonymous/")), passwd); 776 setproctitle(proctitle); 777 #endif /* HASSETPROCTITLE */ 778 if (logging) 779 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 780 remotehost, passwd); 781 } else { 782 reply(230, "User %s logged in.", pw->pw_name); 783 #ifdef HASSETPROCTITLE 784 snprintf(proctitle, sizeof(proctitle), 785 "%s: %s", remotehost, pw->pw_name); 786 setproctitle(proctitle); 787 #endif /* HASSETPROCTITLE */ 788 if (logging) 789 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 790 remotehost, pw->pw_name); 791 } 792 (void) umask(curclass.umask); 793 return; 794 bad: 795 /* Forget all about it... */ 796 end_login(); 797 } 798 799 void 800 retrieve(cmd, name) 801 char *cmd, *name; 802 { 803 FILE *fin = NULL, *dout; 804 struct stat st; 805 int (*closefunc) __P((FILE *)) = NULL; 806 int log; 807 808 log = (cmd == 0); 809 if (cmd == 0) { 810 fin = fopen(name, "r"), closefunc = fclose; 811 if (fin == NULL) 812 cmd = do_conversion(name); 813 } 814 if (cmd) { 815 char line[BUFSIZ]; 816 817 (void)snprintf(line, sizeof(line), cmd, name), name = line; 818 fin = ftpd_popen(line, "r", 1), closefunc = ftpd_pclose; 819 st.st_size = -1; 820 st.st_blksize = BUFSIZ; 821 } 822 if (fin == NULL) { 823 if (errno != 0) { 824 perror_reply(550, name); 825 if (log) { 826 LOGCMD("get", name); 827 } 828 } 829 return; 830 } 831 byte_count = -1; 832 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 833 reply(550, "%s: not a plain file.", name); 834 goto done; 835 } 836 if (restart_point) { 837 if (type == TYPE_A) { 838 off_t i, n; 839 int c; 840 841 n = restart_point; 842 i = 0; 843 while (i++ < n) { 844 if ((c=getc(fin)) == EOF) { 845 perror_reply(550, name); 846 goto done; 847 } 848 if (c == '\n') 849 i++; 850 } 851 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 852 perror_reply(550, name); 853 goto done; 854 } 855 } 856 dout = dataconn(name, st.st_size, "w"); 857 if (dout == NULL) 858 goto done; 859 send_data(fin, dout, st.st_blksize); 860 (void) fclose(dout); 861 data = -1; 862 pdata = -1; 863 done: 864 if (log) 865 LOGBYTES("get", name, byte_count); 866 (*closefunc)(fin); 867 } 868 869 void 870 store(name, mode, unique) 871 char *name, *mode; 872 int unique; 873 { 874 FILE *fout, *din; 875 struct stat st; 876 int (*closefunc) __P((FILE *)); 877 878 if (unique && stat(name, &st) == 0 && 879 (name = gunique(name)) == NULL) { 880 LOGCMD(*mode == 'w' ? "put" : "append", name); 881 return; 882 } 883 884 if (restart_point) 885 mode = "r+"; 886 fout = fopen(name, mode); 887 closefunc = fclose; 888 if (fout == NULL) { 889 perror_reply(553, name); 890 LOGCMD(*mode == 'w' ? "put" : "append", name); 891 return; 892 } 893 byte_count = -1; 894 if (restart_point) { 895 if (type == TYPE_A) { 896 off_t i, n; 897 int c; 898 899 n = restart_point; 900 i = 0; 901 while (i++ < n) { 902 if ((c=getc(fout)) == EOF) { 903 perror_reply(550, name); 904 goto done; 905 } 906 if (c == '\n') 907 i++; 908 } 909 /* 910 * We must do this seek to "current" position 911 * because we are changing from reading to 912 * writing. 913 */ 914 if (fseek(fout, 0L, SEEK_CUR) < 0) { 915 perror_reply(550, name); 916 goto done; 917 } 918 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 919 perror_reply(550, name); 920 goto done; 921 } 922 } 923 din = dataconn(name, (off_t)-1, "r"); 924 if (din == NULL) 925 goto done; 926 if (receive_data(din, fout) == 0) { 927 if (unique) 928 reply(226, "Transfer complete (unique file name:%s).", 929 name); 930 else 931 reply(226, "Transfer complete."); 932 } 933 (void) fclose(din); 934 data = -1; 935 pdata = -1; 936 done: 937 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 938 (*closefunc)(fout); 939 } 940 941 static FILE * 942 getdatasock(mode) 943 char *mode; 944 { 945 int on = 1, s, t, tries; 946 947 if (data >= 0) 948 return (fdopen(data, mode)); 949 (void) seteuid((uid_t)0); 950 s = socket(AF_INET, SOCK_STREAM, 0); 951 if (s < 0) 952 goto bad; 953 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 954 (char *) &on, sizeof(on)) < 0) 955 goto bad; 956 /* anchor socket to avoid multi-homing problems */ 957 data_source.sin_len = sizeof(struct sockaddr_in); 958 data_source.sin_family = AF_INET; 959 data_source.sin_addr = ctrl_addr.sin_addr; 960 for (tries = 1; ; tries++) { 961 if (bind(s, (struct sockaddr *)&data_source, 962 sizeof(data_source)) >= 0) 963 break; 964 if (errno != EADDRINUSE || tries > 10) 965 goto bad; 966 sleep(tries); 967 } 968 (void) seteuid((uid_t)pw->pw_uid); 969 #ifdef IP_TOS 970 on = IPTOS_THROUGHPUT; 971 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 972 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 973 #endif 974 return (fdopen(s, mode)); 975 bad: 976 /* Return the real value of errno (close may change it) */ 977 t = errno; 978 (void) seteuid((uid_t)pw->pw_uid); 979 (void) close(s); 980 errno = t; 981 return (NULL); 982 } 983 984 static FILE * 985 dataconn(name, size, mode) 986 char *name; 987 off_t size; 988 char *mode; 989 { 990 char sizebuf[32]; 991 FILE *file; 992 int retry = 0, tos; 993 994 file_size = size; 995 byte_count = 0; 996 if (size != (off_t) -1) 997 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 998 (long long)size); 999 else 1000 sizebuf[0] = '\0'; 1001 if (pdata >= 0) { 1002 struct sockaddr_in from; 1003 int s, fromlen = sizeof(from); 1004 1005 (void) alarm(curclass.timeout); 1006 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1007 (void) alarm(0); 1008 if (s < 0) { 1009 reply(425, "Can't open data connection."); 1010 (void) close(pdata); 1011 pdata = -1; 1012 return (NULL); 1013 } 1014 (void) close(pdata); 1015 pdata = s; 1016 #ifdef IP_TOS 1017 tos = IPTOS_THROUGHPUT; 1018 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1019 sizeof(int)); 1020 #endif 1021 reply(150, "Opening %s mode data connection for '%s'%s.", 1022 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1023 return (fdopen(pdata, mode)); 1024 } 1025 if (data >= 0) { 1026 reply(125, "Using existing data connection for '%s'%s.", 1027 name, sizebuf); 1028 usedefault = 1; 1029 return (fdopen(data, mode)); 1030 } 1031 if (usedefault) 1032 data_dest = his_addr; 1033 usedefault = 1; 1034 file = getdatasock(mode); 1035 if (file == NULL) { 1036 reply(425, "Can't create data socket (%s,%d): %s.", 1037 inet_ntoa(data_source.sin_addr), 1038 ntohs(data_source.sin_port), strerror(errno)); 1039 return (NULL); 1040 } 1041 data = fileno(file); 1042 while (connect(data, (struct sockaddr *)&data_dest, 1043 sizeof(data_dest)) < 0) { 1044 if (errno == EADDRINUSE && retry < swaitmax) { 1045 sleep((unsigned) swaitint); 1046 retry += swaitint; 1047 continue; 1048 } 1049 perror_reply(425, "Can't build data connection"); 1050 (void) fclose(file); 1051 data = -1; 1052 return (NULL); 1053 } 1054 reply(150, "Opening %s mode data connection for '%s'%s.", 1055 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1056 return (file); 1057 } 1058 1059 /* 1060 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1061 * encapsulation of the data subject * to Mode, Structure, and Type. 1062 * 1063 * NB: Form isn't handled. 1064 */ 1065 static void 1066 send_data(instr, outstr, blksize) 1067 FILE *instr, *outstr; 1068 off_t blksize; 1069 { 1070 int c, cnt, filefd, netfd; 1071 char *buf; 1072 1073 transflag++; 1074 if (setjmp(urgcatch)) { 1075 transflag = 0; 1076 return; 1077 } 1078 1079 switch (type) { 1080 1081 case TYPE_A: 1082 while ((c = getc(instr)) != EOF) { 1083 byte_count++; 1084 if (c == '\n') { 1085 if (ferror(outstr)) 1086 goto data_err; 1087 (void) putc('\r', outstr); 1088 } 1089 (void) putc(c, outstr); 1090 } 1091 fflush(outstr); 1092 transflag = 0; 1093 if (ferror(instr)) 1094 goto file_err; 1095 if (ferror(outstr)) 1096 goto data_err; 1097 reply(226, "Transfer complete."); 1098 return; 1099 1100 case TYPE_I: 1101 case TYPE_L: 1102 if ((buf = malloc((u_int)blksize)) == NULL) { 1103 transflag = 0; 1104 perror_reply(451, "Local resource failure: malloc"); 1105 return; 1106 } 1107 netfd = fileno(outstr); 1108 filefd = fileno(instr); 1109 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1110 write(netfd, buf, cnt) == cnt) 1111 byte_count += cnt; 1112 transflag = 0; 1113 (void)free(buf); 1114 if (cnt != 0) { 1115 if (cnt < 0) 1116 goto file_err; 1117 goto data_err; 1118 } 1119 reply(226, "Transfer complete."); 1120 return; 1121 default: 1122 transflag = 0; 1123 reply(550, "Unimplemented TYPE %d in send_data", type); 1124 return; 1125 } 1126 1127 data_err: 1128 transflag = 0; 1129 perror_reply(426, "Data connection"); 1130 return; 1131 1132 file_err: 1133 transflag = 0; 1134 perror_reply(551, "Error on input file"); 1135 } 1136 1137 /* 1138 * Transfer data from peer to "outstr" using the appropriate encapulation of 1139 * the data subject to Mode, Structure, and Type. 1140 * 1141 * N.B.: Form isn't handled. 1142 */ 1143 static int 1144 receive_data(instr, outstr) 1145 FILE *instr, *outstr; 1146 { 1147 int c, cnt, bare_lfs; 1148 char buf[BUFSIZ]; 1149 #ifdef __GNUC__ 1150 (void) &bare_lfs; 1151 #endif 1152 1153 bare_lfs = 0; 1154 transflag++; 1155 if (setjmp(urgcatch)) { 1156 transflag = 0; 1157 return (-1); 1158 } 1159 1160 switch (type) { 1161 1162 case TYPE_I: 1163 case TYPE_L: 1164 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1165 if (write(fileno(outstr), buf, cnt) != cnt) 1166 goto file_err; 1167 byte_count += cnt; 1168 } 1169 if (cnt < 0) 1170 goto data_err; 1171 transflag = 0; 1172 return (0); 1173 1174 case TYPE_E: 1175 reply(553, "TYPE E not implemented."); 1176 transflag = 0; 1177 return (-1); 1178 1179 case TYPE_A: 1180 while ((c = getc(instr)) != EOF) { 1181 byte_count++; 1182 if (c == '\n') 1183 bare_lfs++; 1184 while (c == '\r') { 1185 if (ferror(outstr)) 1186 goto data_err; 1187 if ((c = getc(instr)) != '\n') { 1188 (void) putc ('\r', outstr); 1189 if (c == '\0' || c == EOF) 1190 goto contin2; 1191 } 1192 } 1193 (void) putc(c, outstr); 1194 contin2: ; 1195 } 1196 fflush(outstr); 1197 if (ferror(instr)) 1198 goto data_err; 1199 if (ferror(outstr)) 1200 goto file_err; 1201 transflag = 0; 1202 if (bare_lfs) { 1203 lreply(226, 1204 "WARNING! %d bare linefeeds received in ASCII mode", 1205 bare_lfs); 1206 (void)printf(" File may not have transferred correctly.\r\n"); 1207 } 1208 return (0); 1209 default: 1210 reply(550, "Unimplemented TYPE %d in receive_data", type); 1211 transflag = 0; 1212 return (-1); 1213 } 1214 1215 data_err: 1216 transflag = 0; 1217 perror_reply(426, "Data Connection"); 1218 return (-1); 1219 1220 file_err: 1221 transflag = 0; 1222 perror_reply(452, "Error writing file"); 1223 return (-1); 1224 } 1225 1226 void 1227 statfilecmd(filename) 1228 char *filename; 1229 { 1230 FILE *fin; 1231 int c; 1232 char line[LINE_MAX]; 1233 1234 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1235 fin = ftpd_popen(line, "r", 0); 1236 lreply(211, "status of %s:", filename); 1237 while ((c = getc(fin)) != EOF) { 1238 if (c == '\n') { 1239 if (ferror(stdout)){ 1240 perror_reply(421, "control connection"); 1241 (void) ftpd_pclose(fin); 1242 dologout(1); 1243 /* NOTREACHED */ 1244 } 1245 if (ferror(fin)) { 1246 perror_reply(551, filename); 1247 (void) ftpd_pclose(fin); 1248 return; 1249 } 1250 (void) putc('\r', stdout); 1251 } 1252 (void) putc(c, stdout); 1253 } 1254 (void) ftpd_pclose(fin); 1255 reply(211, "End of Status"); 1256 } 1257 1258 void 1259 statcmd() 1260 { 1261 struct sockaddr_in *sin; 1262 u_char *a, *p; 1263 1264 lreply(211, "%s FTP server status:", hostname); 1265 lreply(211, "%s", version); 1266 if (isdigit(remotehost[0])) 1267 lreply(211, "Connected to %s", remotehost); 1268 else 1269 lreply(211, "Connected to %s (%s)", remotehost, 1270 inet_ntoa(his_addr.sin_addr)); 1271 if (logged_in) { 1272 if (guest) 1273 lreply(211, "Logged in anonymously"); 1274 else 1275 lreply(211, "Logged in as %s", pw->pw_name); 1276 } else if (askpasswd) 1277 lreply(211, "Waiting for password"); 1278 else 1279 lreply(211, "Waiting for user name"); 1280 printf("211- TYPE: %s", typenames[type]); 1281 if (type == TYPE_A || type == TYPE_E) 1282 printf(", FORM: %s", formnames[form]); 1283 if (type == TYPE_L) 1284 #if NBBY == 8 1285 printf(" %d", NBBY); 1286 #else 1287 printf(" %d", bytesize); /* need definition! */ 1288 #endif 1289 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1290 strunames[stru], modenames[mode]); 1291 if (data != -1) 1292 lreply(211, "Data connection open"); 1293 else if (pdata != -1) { 1294 printf("211- in Passive mode"); 1295 sin = &pasv_addr; 1296 goto printaddr; 1297 } else if (usedefault == 0) { 1298 printf("211- PORT"); 1299 sin = &data_dest; 1300 printaddr: 1301 a = (u_char *) &sin->sin_addr; 1302 p = (u_char *) &sin->sin_port; 1303 #define UC(b) (((int) b) & 0xff) 1304 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1305 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1306 #undef UC 1307 } else 1308 lreply(211, "No data connection"); 1309 1310 if (logged_in) { 1311 struct ftpconv *cp; 1312 1313 lreply(211, ""); 1314 lreply(211, "Class: %s", curclass.classname); 1315 lreply(211, "Check PORT commands: %sabled", 1316 curclass.checkportcmd ? "en" : "dis"); 1317 if (curclass.display) 1318 lreply(211, "Display file: %s", curclass.display); 1319 if (curclass.notify) 1320 lreply(211, "Notify fileglob: %s", curclass.notify); 1321 lreply(211, "Idle timeout: %d, maximum timeout: %d", 1322 curclass.timeout, curclass.maxtimeout); 1323 lreply(211, "DELE, MKD, RMD, UMASK, CHMOD commands: %sabled", 1324 curclass.modify ? "en" : "dis"); 1325 lreply(211, "Umask: %.04o", curclass.umask); 1326 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1327 if (cp->suffix == NULL || cp->types == NULL || 1328 cp->command == NULL) 1329 continue; 1330 lreply(211, 1331 "Conversion: %s [%s] disable: %s, command: %s", 1332 cp->suffix, cp->types, cp->disable, cp->command); 1333 } 1334 } 1335 1336 reply(211, "End of status"); 1337 } 1338 1339 void 1340 fatal(s) 1341 char *s; 1342 { 1343 1344 reply(451, "Error in server: %s\n", s); 1345 reply(221, "Closing connection due to server error."); 1346 dologout(0); 1347 /* NOTREACHED */ 1348 } 1349 1350 void 1351 #ifdef __STDC__ 1352 reply(int n, const char *fmt, ...) 1353 #else 1354 reply(n, fmt, va_alist) 1355 int n; 1356 char *fmt; 1357 va_dcl 1358 #endif 1359 { 1360 va_list ap; 1361 #ifdef __STDC__ 1362 va_start(ap, fmt); 1363 #else 1364 va_start(ap); 1365 #endif 1366 (void)printf("%d ", n); 1367 (void)vprintf(fmt, ap); 1368 (void)printf("\r\n"); 1369 (void)fflush(stdout); 1370 if (debug) { 1371 syslog(LOG_DEBUG, "<--- %d ", n); 1372 vsyslog(LOG_DEBUG, fmt, ap); 1373 } 1374 } 1375 1376 void 1377 #ifdef __STDC__ 1378 lreply(int n, const char *fmt, ...) 1379 #else 1380 lreply(n, fmt, va_alist) 1381 int n; 1382 char *fmt; 1383 va_dcl 1384 #endif 1385 { 1386 va_list ap; 1387 #ifdef __STDC__ 1388 va_start(ap, fmt); 1389 #else 1390 va_start(ap); 1391 #endif 1392 (void)printf("%d- ", n); 1393 (void)vprintf(fmt, ap); 1394 (void)printf("\r\n"); 1395 (void)fflush(stdout); 1396 if (debug) { 1397 syslog(LOG_DEBUG, "<--- %d- ", n); 1398 vsyslog(LOG_DEBUG, fmt, ap); 1399 } 1400 } 1401 1402 static void 1403 ack(s) 1404 char *s; 1405 { 1406 1407 reply(250, "%s command successful.", s); 1408 } 1409 1410 void 1411 nack(s) 1412 char *s; 1413 { 1414 1415 reply(502, "%s command not implemented.", s); 1416 } 1417 1418 /* ARGSUSED */ 1419 void 1420 yyerror(s) 1421 char *s; 1422 { 1423 char *cp; 1424 1425 if ((cp = strchr(cbuf,'\n')) != NULL) 1426 *cp = '\0'; 1427 reply(500, "'%s': command not understood.", cbuf); 1428 } 1429 1430 void 1431 delete(name) 1432 char *name; 1433 { 1434 1435 LOGCMD("delete", name); 1436 if (remove(name) < 0) 1437 perror_reply(550, name); 1438 else 1439 ack("DELE"); 1440 } 1441 1442 void 1443 cwd(path) 1444 char *path; 1445 { 1446 1447 if (chdir(path) < 0) 1448 perror_reply(550, path); 1449 else { 1450 show_chdir_messages(250); 1451 ack("CWD"); 1452 } 1453 } 1454 1455 static void 1456 replydirname(name, message) 1457 const char *name, *message; 1458 { 1459 char npath[MAXPATHLEN + 1]; 1460 int i; 1461 1462 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 1463 npath[i] = *name; 1464 if (*name == '"') 1465 npath[++i] = '"'; 1466 } 1467 npath[i] = '\0'; 1468 reply(257, "\"%s\" %s", npath, message); 1469 } 1470 1471 void 1472 makedir(name) 1473 char *name; 1474 { 1475 1476 LOGCMD("mkdir", name); 1477 if (mkdir(name, 0777) < 0) 1478 perror_reply(550, name); 1479 else 1480 replydirname(name, "directory created."); 1481 } 1482 1483 void 1484 removedir(name) 1485 char *name; 1486 { 1487 1488 LOGCMD("rmdir", name); 1489 if (rmdir(name) < 0) 1490 perror_reply(550, name); 1491 else 1492 ack("RMD"); 1493 } 1494 1495 void 1496 pwd() 1497 { 1498 char path[MAXPATHLEN + 1]; 1499 1500 if (getcwd(path, sizeof(path) - 1) == NULL) 1501 reply(550, "%s.", path); 1502 else 1503 replydirname(path, "is the current directory."); 1504 } 1505 1506 char * 1507 renamefrom(name) 1508 char *name; 1509 { 1510 struct stat st; 1511 1512 if (stat(name, &st) < 0) { 1513 perror_reply(550, name); 1514 return ((char *)0); 1515 } 1516 reply(350, "File exists, ready for destination name"); 1517 return (name); 1518 } 1519 1520 void 1521 renamecmd(from, to) 1522 char *from, *to; 1523 { 1524 1525 LOGCMD2("rename", from, to); 1526 if (rename(from, to) < 0) 1527 perror_reply(550, "rename"); 1528 else 1529 ack("RNTO"); 1530 } 1531 1532 static void 1533 dolog(sin) 1534 struct sockaddr_in *sin; 1535 { 1536 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1537 sizeof(struct in_addr), AF_INET); 1538 1539 if (hp) 1540 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1541 else 1542 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1543 sizeof(remotehost)); 1544 #ifdef HASSETPROCTITLE 1545 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1546 setproctitle(proctitle); 1547 #endif /* HASSETPROCTITLE */ 1548 1549 if (logging) 1550 syslog(LOG_INFO, "connection from %s", remotehost); 1551 } 1552 1553 /* 1554 * Record logout in wtmp file 1555 * and exit with supplied status. 1556 */ 1557 void 1558 dologout(status) 1559 int status; 1560 { 1561 /* 1562 * Prevent reception of SIGURG from resulting in a resumption 1563 * back to the main program loop. 1564 */ 1565 transflag = 0; 1566 1567 if (logged_in) { 1568 (void) seteuid((uid_t)0); 1569 logwtmp(ttyline, "", ""); 1570 #ifdef KERBEROS 1571 if (!notickets && krbtkfile_env) 1572 unlink(krbtkfile_env); 1573 #endif 1574 } 1575 /* beware of flushing buffers after a SIGPIPE */ 1576 _exit(status); 1577 } 1578 1579 static void 1580 myoob(signo) 1581 int signo; 1582 { 1583 char *cp; 1584 1585 /* only process if transfer occurring */ 1586 if (!transflag) 1587 return; 1588 cp = tmpline; 1589 if (getline(cp, 7, stdin) == NULL) { 1590 reply(221, "You could at least say goodbye."); 1591 dologout(0); 1592 } 1593 upper(cp); 1594 if (strcmp(cp, "ABOR\r\n") == 0) { 1595 tmpline[0] = '\0'; 1596 reply(426, "Transfer aborted. Data connection closed."); 1597 reply(226, "Abort successful"); 1598 longjmp(urgcatch, 1); 1599 } 1600 if (strcmp(cp, "STAT\r\n") == 0) { 1601 if (file_size != (off_t) -1) 1602 reply(213, "Status: %qd of %qd bytes transferred", 1603 byte_count, file_size); 1604 else 1605 reply(213, "Status: %qd bytes transferred", byte_count); 1606 } 1607 } 1608 1609 /* 1610 * Note: a response of 425 is not mentioned as a possible response to 1611 * the PASV command in RFC959. However, it has been blessed as 1612 * a legitimate response by Jon Postel in a telephone conversation 1613 * with Rick Adams on 25 Jan 89. 1614 */ 1615 void 1616 passive() 1617 { 1618 int len; 1619 char *p, *a; 1620 1621 pdata = socket(AF_INET, SOCK_STREAM, 0); 1622 if (pdata < 0 || !logged_in) { 1623 perror_reply(425, "Can't open passive connection"); 1624 return; 1625 } 1626 pasv_addr = ctrl_addr; 1627 pasv_addr.sin_port = 0; 1628 (void) seteuid((uid_t)0); 1629 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1630 (void) seteuid((uid_t)pw->pw_uid); 1631 goto pasv_error; 1632 } 1633 (void) seteuid((uid_t)pw->pw_uid); 1634 len = sizeof(pasv_addr); 1635 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1636 goto pasv_error; 1637 if (listen(pdata, 1) < 0) 1638 goto pasv_error; 1639 a = (char *) &pasv_addr.sin_addr; 1640 p = (char *) &pasv_addr.sin_port; 1641 1642 #define UC(b) (((int) b) & 0xff) 1643 1644 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1645 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1646 return; 1647 1648 pasv_error: 1649 (void) close(pdata); 1650 pdata = -1; 1651 perror_reply(425, "Can't open passive connection"); 1652 return; 1653 } 1654 1655 /* 1656 * Generate unique name for file with basename "local". 1657 * The file named "local" is already known to exist. 1658 * Generates failure reply on error. 1659 * 1660 * XXX this function should under go changes similar to 1661 * the mktemp(3)/mkstemp(3) changes. 1662 */ 1663 static char * 1664 gunique(local) 1665 char *local; 1666 { 1667 static char new[MAXPATHLEN]; 1668 struct stat st; 1669 int count, len; 1670 char *cp; 1671 1672 cp = strrchr(local, '/'); 1673 if (cp) 1674 *cp = '\0'; 1675 if (stat(cp ? local : ".", &st) < 0) { 1676 perror_reply(553, cp ? local : "."); 1677 return ((char *) 0); 1678 } 1679 if (cp) 1680 *cp = '/'; 1681 (void) strcpy(new, local); 1682 len = strlen(new); 1683 cp = new + len; 1684 *cp++ = '.'; 1685 for (count = 1; count < 100; count++) { 1686 (void)snprintf(cp, sizeof(new) - len - 2, "%d", count); 1687 if (stat(new, &st) < 0) 1688 return (new); 1689 } 1690 reply(452, "Unique file name cannot be created."); 1691 return (NULL); 1692 } 1693 1694 /* 1695 * Format and send reply containing system error number. 1696 */ 1697 void 1698 perror_reply(code, string) 1699 int code; 1700 char *string; 1701 { 1702 1703 reply(code, "%s: %s.", string, strerror(errno)); 1704 } 1705 1706 static char *onefile[] = { 1707 "", 1708 0 1709 }; 1710 1711 void 1712 send_file_list(whichf) 1713 char *whichf; 1714 { 1715 struct stat st; 1716 DIR *dirp = NULL; 1717 struct dirent *dir; 1718 FILE *dout = NULL; 1719 char **dirlist, *dirname; 1720 int simple = 0; 1721 int freeglob = 0; 1722 glob_t gl; 1723 #ifdef __GNUC__ 1724 (void) &dout; 1725 (void) &dirlist; 1726 (void) &simple; 1727 (void) &freeglob; 1728 #endif 1729 1730 if (strpbrk(whichf, "~{[*?") != NULL) { 1731 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1732 1733 memset(&gl, 0, sizeof(gl)); 1734 freeglob = 1; 1735 if (glob(whichf, flags, 0, &gl)) { 1736 reply(550, "not found"); 1737 goto out; 1738 } else if (gl.gl_pathc == 0) { 1739 errno = ENOENT; 1740 perror_reply(550, whichf); 1741 goto out; 1742 } 1743 dirlist = gl.gl_pathv; 1744 } else { 1745 onefile[0] = whichf; 1746 dirlist = onefile; 1747 simple = 1; 1748 } 1749 1750 if (setjmp(urgcatch)) { 1751 transflag = 0; 1752 goto out; 1753 } 1754 while ((dirname = *dirlist++) != NULL) { 1755 int trailingslash = 0; 1756 1757 if (stat(dirname, &st) < 0) { 1758 /* 1759 * If user typed "ls -l", etc, and the client 1760 * used NLST, do what the user meant. 1761 */ 1762 if (dirname[0] == '-' && *dirlist == NULL && 1763 transflag == 0) { 1764 retrieve("/bin/ls %s", dirname); 1765 goto out; 1766 } 1767 perror_reply(550, whichf); 1768 if (dout != NULL) { 1769 (void) fclose(dout); 1770 transflag = 0; 1771 data = -1; 1772 pdata = -1; 1773 } 1774 goto out; 1775 } 1776 1777 if (S_ISREG(st.st_mode)) { 1778 if (dout == NULL) { 1779 dout = dataconn("file list", (off_t)-1, "w"); 1780 if (dout == NULL) 1781 goto out; 1782 transflag++; 1783 } 1784 fprintf(dout, "%s%s\n", dirname, 1785 type == TYPE_A ? "\r" : ""); 1786 byte_count += strlen(dirname) + 1; 1787 continue; 1788 } else if (!S_ISDIR(st.st_mode)) 1789 continue; 1790 1791 if (dirname[strlen(dirname) - 1] == '/') 1792 trailingslash++; 1793 1794 if ((dirp = opendir(dirname)) == NULL) 1795 continue; 1796 1797 while ((dir = readdir(dirp)) != NULL) { 1798 char nbuf[MAXPATHLEN]; 1799 1800 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1801 continue; 1802 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1803 dir->d_namlen == 2) 1804 continue; 1805 1806 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 1807 trailingslash ? "" : "/", dir->d_name); 1808 1809 /* 1810 * We have to do a stat to ensure it's 1811 * not a directory or special file. 1812 */ 1813 if (simple || (stat(nbuf, &st) == 0 && 1814 S_ISREG(st.st_mode))) { 1815 if (dout == NULL) { 1816 dout = dataconn("file list", (off_t)-1, 1817 "w"); 1818 if (dout == NULL) 1819 goto out; 1820 transflag++; 1821 } 1822 if (nbuf[0] == '.' && nbuf[1] == '/') 1823 fprintf(dout, "%s%s\n", &nbuf[2], 1824 type == TYPE_A ? "\r" : ""); 1825 else 1826 fprintf(dout, "%s%s\n", nbuf, 1827 type == TYPE_A ? "\r" : ""); 1828 byte_count += strlen(nbuf) + 1; 1829 } 1830 } 1831 (void) closedir(dirp); 1832 } 1833 1834 if (dout == NULL) 1835 reply(550, "No files found."); 1836 else if (ferror(dout) != 0) 1837 perror_reply(550, "Data connection"); 1838 else 1839 reply(226, "Transfer complete."); 1840 1841 transflag = 0; 1842 if (dout != NULL) 1843 (void) fclose(dout); 1844 data = -1; 1845 pdata = -1; 1846 out: 1847 if (freeglob) { 1848 freeglob = 0; 1849 globfree(&gl); 1850 } 1851 } 1852 1853 char * 1854 conffilename(s) 1855 const char *s; 1856 { 1857 static char filename[MAXPATHLEN]; 1858 1859 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 1860 return filename; 1861 } 1862
Indexes created Tue Sep 23 02:09:52 GMT 2025