ftpd.c revision 1.50
1 /* $NetBSD: ftpd.c,v 1.50 1998/06/19 22:59:01 kleink 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 1.50 1998/06/19 22:59:01 kleink 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 int 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 != NULL && 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, sendrv, closerv, stderrfd, isconversion; 807 808 sendrv = closerv = stderrfd = -1; 809 isconversion = 0; 810 log = (cmd == 0); 811 if (cmd == NULL) { 812 fin = fopen(name, "r"), closefunc = fclose; 813 if (fin == NULL) 814 cmd = do_conversion(name); 815 if (cmd != NULL) { 816 isconversion++; 817 syslog(LOG_INFO, "get command: '%s'", cmd); 818 } 819 } 820 if (cmd != NULL) { 821 char line[BUFSIZ]; 822 char temp[MAXPATHLEN]; 823 824 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 825 stderrfd = mkstemp(temp); 826 if (stderrfd != -1) 827 (void)unlink(temp); 828 (void)snprintf(line, sizeof(line), cmd, name), name = line; 829 fin = ftpd_popen(line, "r", stderrfd), closefunc = ftpd_pclose; 830 st.st_size = -1; 831 st.st_blksize = BUFSIZ; 832 } 833 if (fin == NULL) { 834 if (errno != 0) { 835 perror_reply(550, name); 836 if (log) { 837 LOGCMD("get", name); 838 } 839 } 840 if (stderrfd != -1) 841 (void)close(stderrfd); 842 return; 843 } 844 byte_count = -1; 845 if (cmd == NULL 846 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 847 reply(550, "%s: not a plain file.", name); 848 goto done; 849 } 850 if (restart_point) { 851 if (type == TYPE_A) { 852 off_t i; 853 int c; 854 855 for (i = 0; i < restart_point; i++) { 856 if ((c=getc(fin)) == EOF) { 857 perror_reply(550, name); 858 goto done; 859 } 860 if (c == '\n') 861 i++; 862 } 863 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 864 perror_reply(550, name); 865 goto done; 866 } 867 } 868 dout = dataconn(name, st.st_size, "w"); 869 if (dout == NULL) 870 goto done; 871 sendrv = send_data(fin, dout, st.st_blksize); 872 (void) fclose(dout); 873 data = -1; 874 pdata = -1; 875 done: 876 if (log) 877 LOGBYTES("get", name, byte_count); 878 closerv = (*closefunc)(fin); 879 if (sendrv == 0) { 880 FILE *err; 881 struct stat sb; 882 883 if (cmd != NULL && closerv != 0) { 884 lreply(226, 885 "Command returned an exit status of %d", 886 closerv); 887 if (isconversion) 888 syslog(LOG_INFO, 889 "get command: '%s' returned %d", 890 cmd, closerv); 891 } 892 if (cmd != NULL && stderrfd != -1 && 893 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 894 ((err = fdopen(stderrfd, "r")) != NULL)) { 895 char *cp, line[LINE_MAX]; 896 897 lreply(226, "Command error messages:"); 898 rewind(err); 899 while (fgets(line, sizeof(line), err) != NULL) { 900 if ((cp = strchr(line, '\n')) != NULL) 901 *cp = '\0'; 902 lreply(226, " %s", line); 903 } 904 (void) fflush(stdout); 905 (void) fclose(err); 906 lreply(226, "End of command error messages."); 907 /* a reply(226,) must follow */ 908 } 909 reply(226, "Transfer complete."); 910 } 911 if (stderrfd != -1) 912 (void)close(stderrfd); 913 } 914 915 void 916 store(name, mode, unique) 917 char *name, *mode; 918 int unique; 919 { 920 FILE *fout, *din; 921 struct stat st; 922 int (*closefunc) __P((FILE *)); 923 924 if (unique && stat(name, &st) == 0 && 925 (name = gunique(name)) == NULL) { 926 LOGCMD(*mode == 'w' ? "put" : "append", name); 927 return; 928 } 929 930 if (restart_point) 931 mode = "r+"; 932 fout = fopen(name, mode); 933 closefunc = fclose; 934 if (fout == NULL) { 935 perror_reply(553, name); 936 LOGCMD(*mode == 'w' ? "put" : "append", name); 937 return; 938 } 939 byte_count = -1; 940 if (restart_point) { 941 if (type == TYPE_A) { 942 off_t i; 943 int c; 944 945 for (i = 0; i < restart_point; i++) { 946 if ((c=getc(fout)) == EOF) { 947 perror_reply(550, name); 948 goto done; 949 } 950 if (c == '\n') 951 i++; 952 } 953 /* 954 * We must do this seek to "current" position 955 * because we are changing from reading to 956 * writing. 957 */ 958 if (fseek(fout, 0L, SEEK_CUR) < 0) { 959 perror_reply(550, name); 960 goto done; 961 } 962 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 963 perror_reply(550, name); 964 goto done; 965 } 966 } 967 din = dataconn(name, (off_t)-1, "r"); 968 if (din == NULL) 969 goto done; 970 if (receive_data(din, fout) == 0) { 971 if (unique) 972 reply(226, "Transfer complete (unique file name:%s).", 973 name); 974 else 975 reply(226, "Transfer complete."); 976 } 977 (void) fclose(din); 978 data = -1; 979 pdata = -1; 980 done: 981 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 982 (*closefunc)(fout); 983 } 984 985 static FILE * 986 getdatasock(mode) 987 char *mode; 988 { 989 int on = 1, s, t, tries; 990 991 if (data >= 0) 992 return (fdopen(data, mode)); 993 (void) seteuid((uid_t)0); 994 s = socket(AF_INET, SOCK_STREAM, 0); 995 if (s < 0) 996 goto bad; 997 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 998 (char *) &on, sizeof(on)) < 0) 999 goto bad; 1000 /* anchor socket to avoid multi-homing problems */ 1001 data_source.sin_len = sizeof(struct sockaddr_in); 1002 data_source.sin_family = AF_INET; 1003 data_source.sin_addr = ctrl_addr.sin_addr; 1004 for (tries = 1; ; tries++) { 1005 if (bind(s, (struct sockaddr *)&data_source, 1006 sizeof(data_source)) >= 0) 1007 break; 1008 if (errno != EADDRINUSE || tries > 10) 1009 goto bad; 1010 sleep(tries); 1011 } 1012 (void) seteuid((uid_t)pw->pw_uid); 1013 #ifdef IP_TOS 1014 on = IPTOS_THROUGHPUT; 1015 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 1016 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1017 #endif 1018 return (fdopen(s, mode)); 1019 bad: 1020 /* Return the real value of errno (close may change it) */ 1021 t = errno; 1022 (void) seteuid((uid_t)pw->pw_uid); 1023 (void) close(s); 1024 errno = t; 1025 return (NULL); 1026 } 1027 1028 static FILE * 1029 dataconn(name, size, mode) 1030 char *name; 1031 off_t size; 1032 char *mode; 1033 { 1034 char sizebuf[32]; 1035 FILE *file; 1036 int retry = 0, tos; 1037 1038 file_size = size; 1039 byte_count = 0; 1040 if (size != (off_t) -1) 1041 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1042 (long long)size); 1043 else 1044 sizebuf[0] = '\0'; 1045 if (pdata >= 0) { 1046 struct sockaddr_in from; 1047 int s, fromlen = sizeof(from); 1048 1049 (void) alarm(curclass.timeout); 1050 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1051 (void) alarm(0); 1052 if (s < 0) { 1053 reply(425, "Can't open data connection."); 1054 (void) close(pdata); 1055 pdata = -1; 1056 return (NULL); 1057 } 1058 (void) close(pdata); 1059 pdata = s; 1060 #ifdef IP_TOS 1061 tos = IPTOS_THROUGHPUT; 1062 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1063 sizeof(int)); 1064 #endif 1065 reply(150, "Opening %s mode data connection for '%s'%s.", 1066 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1067 return (fdopen(pdata, mode)); 1068 } 1069 if (data >= 0) { 1070 reply(125, "Using existing data connection for '%s'%s.", 1071 name, sizebuf); 1072 usedefault = 1; 1073 return (fdopen(data, mode)); 1074 } 1075 if (usedefault) 1076 data_dest = his_addr; 1077 usedefault = 1; 1078 file = getdatasock(mode); 1079 if (file == NULL) { 1080 reply(425, "Can't create data socket (%s,%d): %s.", 1081 inet_ntoa(data_source.sin_addr), 1082 ntohs(data_source.sin_port), strerror(errno)); 1083 return (NULL); 1084 } 1085 data = fileno(file); 1086 while (connect(data, (struct sockaddr *)&data_dest, 1087 sizeof(data_dest)) < 0) { 1088 if (errno == EADDRINUSE && retry < swaitmax) { 1089 sleep((unsigned) swaitint); 1090 retry += swaitint; 1091 continue; 1092 } 1093 perror_reply(425, "Can't build data connection"); 1094 (void) fclose(file); 1095 data = -1; 1096 return (NULL); 1097 } 1098 reply(150, "Opening %s mode data connection for '%s'%s.", 1099 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1100 return (file); 1101 } 1102 1103 /* 1104 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1105 * encapsulation of the data subject * to Mode, Structure, and Type. 1106 * 1107 * NB: Form isn't handled. 1108 */ 1109 static int 1110 send_data(instr, outstr, blksize) 1111 FILE *instr, *outstr; 1112 off_t blksize; 1113 { 1114 int c, cnt, filefd, netfd; 1115 char *buf; 1116 1117 transflag++; 1118 if (setjmp(urgcatch)) { 1119 transflag = 0; 1120 return (-1); 1121 } 1122 1123 switch (type) { 1124 1125 case TYPE_A: 1126 while ((c = getc(instr)) != EOF) { 1127 byte_count++; 1128 if (c == '\n') { 1129 if (ferror(outstr)) 1130 goto data_err; 1131 (void) putc('\r', outstr); 1132 } 1133 (void) putc(c, outstr); 1134 } 1135 fflush(outstr); 1136 transflag = 0; 1137 if (ferror(instr)) 1138 goto file_err; 1139 if (ferror(outstr)) 1140 goto data_err; 1141 return (0); 1142 1143 case TYPE_I: 1144 case TYPE_L: 1145 if ((buf = malloc((u_int)blksize)) == NULL) { 1146 transflag = 0; 1147 perror_reply(451, "Local resource failure: malloc"); 1148 return (-1); 1149 } 1150 netfd = fileno(outstr); 1151 filefd = fileno(instr); 1152 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1153 write(netfd, buf, cnt) == cnt) 1154 byte_count += cnt; 1155 transflag = 0; 1156 (void)free(buf); 1157 if (cnt != 0) { 1158 if (cnt < 0) 1159 goto file_err; 1160 goto data_err; 1161 } 1162 return (0); 1163 default: 1164 transflag = 0; 1165 reply(550, "Unimplemented TYPE %d in send_data", type); 1166 return (-1); 1167 } 1168 1169 data_err: 1170 transflag = 0; 1171 perror_reply(426, "Data connection"); 1172 return (-1); 1173 1174 file_err: 1175 transflag = 0; 1176 perror_reply(551, "Error on input file"); 1177 return (-1); 1178 } 1179 1180 /* 1181 * Transfer data from peer to "outstr" using the appropriate encapulation of 1182 * the data subject to Mode, Structure, and Type. 1183 * 1184 * N.B.: Form isn't handled. 1185 */ 1186 static int 1187 receive_data(instr, outstr) 1188 FILE *instr, *outstr; 1189 { 1190 int c, cnt, bare_lfs; 1191 char buf[BUFSIZ]; 1192 #ifdef __GNUC__ 1193 (void) &bare_lfs; 1194 #endif 1195 1196 bare_lfs = 0; 1197 transflag++; 1198 if (setjmp(urgcatch)) { 1199 transflag = 0; 1200 return (-1); 1201 } 1202 1203 switch (type) { 1204 1205 case TYPE_I: 1206 case TYPE_L: 1207 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1208 if (write(fileno(outstr), buf, cnt) != cnt) 1209 goto file_err; 1210 byte_count += cnt; 1211 } 1212 if (cnt < 0) 1213 goto data_err; 1214 transflag = 0; 1215 return (0); 1216 1217 case TYPE_E: 1218 reply(553, "TYPE E not implemented."); 1219 transflag = 0; 1220 return (-1); 1221 1222 case TYPE_A: 1223 while ((c = getc(instr)) != EOF) { 1224 byte_count++; 1225 if (c == '\n') 1226 bare_lfs++; 1227 while (c == '\r') { 1228 if (ferror(outstr)) 1229 goto data_err; 1230 if ((c = getc(instr)) != '\n') { 1231 (void) putc ('\r', outstr); 1232 if (c == '\0' || c == EOF) 1233 goto contin2; 1234 } 1235 } 1236 (void) putc(c, outstr); 1237 contin2: ; 1238 } 1239 fflush(outstr); 1240 if (ferror(instr)) 1241 goto data_err; 1242 if (ferror(outstr)) 1243 goto file_err; 1244 transflag = 0; 1245 if (bare_lfs) { 1246 lreply(226, 1247 "WARNING! %d bare linefeeds received in ASCII mode", 1248 bare_lfs); 1249 (void)printf(" File may not have transferred correctly.\r\n"); 1250 } 1251 return (0); 1252 default: 1253 reply(550, "Unimplemented TYPE %d in receive_data", type); 1254 transflag = 0; 1255 return (-1); 1256 } 1257 1258 data_err: 1259 transflag = 0; 1260 perror_reply(426, "Data Connection"); 1261 return (-1); 1262 1263 file_err: 1264 transflag = 0; 1265 perror_reply(452, "Error writing file"); 1266 return (-1); 1267 } 1268 1269 void 1270 statfilecmd(filename) 1271 char *filename; 1272 { 1273 FILE *fin; 1274 int c; 1275 char line[LINE_MAX]; 1276 1277 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1278 fin = ftpd_popen(line, "r", STDOUT_FILENO); 1279 lreply(211, "status of %s:", filename); 1280 while ((c = getc(fin)) != EOF) { 1281 if (c == '\n') { 1282 if (ferror(stdout)){ 1283 perror_reply(421, "control connection"); 1284 (void) ftpd_pclose(fin); 1285 dologout(1); 1286 /* NOTREACHED */ 1287 } 1288 if (ferror(fin)) { 1289 perror_reply(551, filename); 1290 (void) ftpd_pclose(fin); 1291 return; 1292 } 1293 (void) putc('\r', stdout); 1294 } 1295 (void) putc(c, stdout); 1296 } 1297 (void) ftpd_pclose(fin); 1298 reply(211, "End of Status"); 1299 } 1300 1301 void 1302 statcmd() 1303 { 1304 struct sockaddr_in *sin; 1305 u_char *a, *p; 1306 1307 lreply(211, "%s FTP server status:", hostname); 1308 lreply(211, "%s", version); 1309 if (isdigit(remotehost[0])) 1310 lreply(211, "Connected to %s", remotehost); 1311 else 1312 lreply(211, "Connected to %s (%s)", remotehost, 1313 inet_ntoa(his_addr.sin_addr)); 1314 if (logged_in) { 1315 if (guest) 1316 lreply(211, "Logged in anonymously"); 1317 else 1318 lreply(211, "Logged in as %s", pw->pw_name); 1319 } else if (askpasswd) 1320 lreply(211, "Waiting for password"); 1321 else 1322 lreply(211, "Waiting for user name"); 1323 printf("211- TYPE: %s", typenames[type]); 1324 if (type == TYPE_A || type == TYPE_E) 1325 printf(", FORM: %s", formnames[form]); 1326 if (type == TYPE_L) 1327 #if NBBY == 8 1328 printf(" %d", NBBY); 1329 #else 1330 printf(" %d", bytesize); /* need definition! */ 1331 #endif 1332 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1333 strunames[stru], modenames[mode]); 1334 if (data != -1) 1335 lreply(211, "Data connection open"); 1336 else if (pdata != -1) { 1337 printf("211- in Passive mode"); 1338 sin = &pasv_addr; 1339 goto printaddr; 1340 } else if (usedefault == 0) { 1341 printf("211- PORT"); 1342 sin = &data_dest; 1343 printaddr: 1344 a = (u_char *) &sin->sin_addr; 1345 p = (u_char *) &sin->sin_port; 1346 #define UC(b) (((int) b) & 0xff) 1347 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1348 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1349 #undef UC 1350 } else 1351 lreply(211, "No data connection"); 1352 1353 if (logged_in) { 1354 struct ftpconv *cp; 1355 1356 lreply(211, ""); 1357 lreply(211, "Class: %s", curclass.classname); 1358 lreply(211, "Check PORT commands: %sabled", 1359 curclass.checkportcmd ? "en" : "dis"); 1360 if (curclass.display) 1361 lreply(211, "Display file: %s", curclass.display); 1362 if (curclass.notify) 1363 lreply(211, "Notify fileglob: %s", curclass.notify); 1364 lreply(211, "Idle timeout: %d, maximum timeout: %d", 1365 curclass.timeout, curclass.maxtimeout); 1366 lreply(211, "DELE, MKD, RMD, UMASK, CHMOD commands: %sabled", 1367 curclass.modify ? "en" : "dis"); 1368 lreply(211, "Umask: %.04o", curclass.umask); 1369 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1370 if (cp->suffix == NULL || cp->types == NULL || 1371 cp->command == NULL) 1372 continue; 1373 lreply(211, 1374 "Conversion: %s [%s] disable: %s, command: %s", 1375 cp->suffix, cp->types, cp->disable, cp->command); 1376 } 1377 } 1378 1379 reply(211, "End of status"); 1380 } 1381 1382 void 1383 fatal(s) 1384 char *s; 1385 { 1386 1387 reply(451, "Error in server: %s\n", s); 1388 reply(221, "Closing connection due to server error."); 1389 dologout(0); 1390 /* NOTREACHED */ 1391 } 1392 1393 void 1394 #ifdef __STDC__ 1395 reply(int n, const char *fmt, ...) 1396 #else 1397 reply(n, fmt, va_alist) 1398 int n; 1399 char *fmt; 1400 va_dcl 1401 #endif 1402 { 1403 va_list ap; 1404 #ifdef __STDC__ 1405 va_start(ap, fmt); 1406 #else 1407 va_start(ap); 1408 #endif 1409 (void)printf("%d ", n); 1410 (void)vprintf(fmt, ap); 1411 (void)printf("\r\n"); 1412 (void)fflush(stdout); 1413 if (debug) { 1414 syslog(LOG_DEBUG, "<--- %d ", n); 1415 vsyslog(LOG_DEBUG, fmt, ap); 1416 } 1417 } 1418 1419 void 1420 #ifdef __STDC__ 1421 lreply(int n, const char *fmt, ...) 1422 #else 1423 lreply(n, fmt, va_alist) 1424 int n; 1425 char *fmt; 1426 va_dcl 1427 #endif 1428 { 1429 va_list ap; 1430 #ifdef __STDC__ 1431 va_start(ap, fmt); 1432 #else 1433 va_start(ap); 1434 #endif 1435 (void)printf("%d- ", n); 1436 (void)vprintf(fmt, ap); 1437 (void)printf("\r\n"); 1438 (void)fflush(stdout); 1439 if (debug) { 1440 syslog(LOG_DEBUG, "<--- %d- ", n); 1441 vsyslog(LOG_DEBUG, fmt, ap); 1442 } 1443 } 1444 1445 static void 1446 ack(s) 1447 char *s; 1448 { 1449 1450 reply(250, "%s command successful.", s); 1451 } 1452 1453 void 1454 nack(s) 1455 char *s; 1456 { 1457 1458 reply(502, "%s command not implemented.", s); 1459 } 1460 1461 /* ARGSUSED */ 1462 void 1463 yyerror(s) 1464 char *s; 1465 { 1466 char *cp; 1467 1468 if ((cp = strchr(cbuf,'\n')) != NULL) 1469 *cp = '\0'; 1470 reply(500, "'%s': command not understood.", cbuf); 1471 } 1472 1473 void 1474 delete(name) 1475 char *name; 1476 { 1477 1478 LOGCMD("delete", name); 1479 if (remove(name) < 0) 1480 perror_reply(550, name); 1481 else 1482 ack("DELE"); 1483 } 1484 1485 void 1486 cwd(path) 1487 char *path; 1488 { 1489 1490 if (chdir(path) < 0) 1491 perror_reply(550, path); 1492 else { 1493 show_chdir_messages(250); 1494 ack("CWD"); 1495 } 1496 } 1497 1498 static void 1499 replydirname(name, message) 1500 const char *name, *message; 1501 { 1502 char npath[MAXPATHLEN + 1]; 1503 int i; 1504 1505 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 1506 npath[i] = *name; 1507 if (*name == '"') 1508 npath[++i] = '"'; 1509 } 1510 npath[i] = '\0'; 1511 reply(257, "\"%s\" %s", npath, message); 1512 } 1513 1514 void 1515 makedir(name) 1516 char *name; 1517 { 1518 1519 LOGCMD("mkdir", name); 1520 if (mkdir(name, 0777) < 0) 1521 perror_reply(550, name); 1522 else 1523 replydirname(name, "directory created."); 1524 } 1525 1526 void 1527 removedir(name) 1528 char *name; 1529 { 1530 1531 LOGCMD("rmdir", name); 1532 if (rmdir(name) < 0) 1533 perror_reply(550, name); 1534 else 1535 ack("RMD"); 1536 } 1537 1538 void 1539 pwd() 1540 { 1541 char path[MAXPATHLEN + 1]; 1542 1543 if (getcwd(path, sizeof(path) - 1) == NULL) 1544 reply(550, "Can't get the current directory: %s.", 1545 strerror(errno)); 1546 else 1547 replydirname(path, "is the current directory."); 1548 } 1549 1550 char * 1551 renamefrom(name) 1552 char *name; 1553 { 1554 struct stat st; 1555 1556 if (stat(name, &st) < 0) { 1557 perror_reply(550, name); 1558 return ((char *)0); 1559 } 1560 reply(350, "File exists, ready for destination name"); 1561 return (name); 1562 } 1563 1564 void 1565 renamecmd(from, to) 1566 char *from, *to; 1567 { 1568 1569 LOGCMD2("rename", from, to); 1570 if (rename(from, to) < 0) 1571 perror_reply(550, "rename"); 1572 else 1573 ack("RNTO"); 1574 } 1575 1576 static void 1577 dolog(sin) 1578 struct sockaddr_in *sin; 1579 { 1580 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1581 sizeof(struct in_addr), AF_INET); 1582 1583 if (hp) 1584 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1585 else 1586 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1587 sizeof(remotehost)); 1588 #ifdef HASSETPROCTITLE 1589 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1590 setproctitle(proctitle); 1591 #endif /* HASSETPROCTITLE */ 1592 1593 if (logging) 1594 syslog(LOG_INFO, "connection from %s", remotehost); 1595 } 1596 1597 /* 1598 * Record logout in wtmp file 1599 * and exit with supplied status. 1600 */ 1601 void 1602 dologout(status) 1603 int status; 1604 { 1605 /* 1606 * Prevent reception of SIGURG from resulting in a resumption 1607 * back to the main program loop. 1608 */ 1609 transflag = 0; 1610 1611 if (logged_in) { 1612 (void) seteuid((uid_t)0); 1613 logwtmp(ttyline, "", ""); 1614 #ifdef KERBEROS 1615 if (!notickets && krbtkfile_env) 1616 unlink(krbtkfile_env); 1617 #endif 1618 } 1619 /* beware of flushing buffers after a SIGPIPE */ 1620 _exit(status); 1621 } 1622 1623 static void 1624 myoob(signo) 1625 int signo; 1626 { 1627 char *cp; 1628 1629 /* only process if transfer occurring */ 1630 if (!transflag) 1631 return; 1632 cp = tmpline; 1633 if (getline(cp, 7, stdin) == NULL) { 1634 reply(221, "You could at least say goodbye."); 1635 dologout(0); 1636 } 1637 upper(cp); 1638 if (strcmp(cp, "ABOR\r\n") == 0) { 1639 tmpline[0] = '\0'; 1640 reply(426, "Transfer aborted. Data connection closed."); 1641 reply(226, "Abort successful"); 1642 longjmp(urgcatch, 1); 1643 } 1644 if (strcmp(cp, "STAT\r\n") == 0) { 1645 if (file_size != (off_t) -1) 1646 reply(213, "Status: %qd of %qd bytes transferred", 1647 byte_count, file_size); 1648 else 1649 reply(213, "Status: %qd bytes transferred", byte_count); 1650 } 1651 } 1652 1653 /* 1654 * Note: a response of 425 is not mentioned as a possible response to 1655 * the PASV command in RFC959. However, it has been blessed as 1656 * a legitimate response by Jon Postel in a telephone conversation 1657 * with Rick Adams on 25 Jan 89. 1658 */ 1659 void 1660 passive() 1661 { 1662 int len; 1663 char *p, *a; 1664 1665 pdata = socket(AF_INET, SOCK_STREAM, 0); 1666 if (pdata < 0 || !logged_in) { 1667 perror_reply(425, "Can't open passive connection"); 1668 return; 1669 } 1670 pasv_addr = ctrl_addr; 1671 pasv_addr.sin_port = 0; 1672 (void) seteuid((uid_t)0); 1673 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1674 (void) seteuid((uid_t)pw->pw_uid); 1675 goto pasv_error; 1676 } 1677 (void) seteuid((uid_t)pw->pw_uid); 1678 len = sizeof(pasv_addr); 1679 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1680 goto pasv_error; 1681 if (listen(pdata, 1) < 0) 1682 goto pasv_error; 1683 a = (char *) &pasv_addr.sin_addr; 1684 p = (char *) &pasv_addr.sin_port; 1685 1686 #define UC(b) (((int) b) & 0xff) 1687 1688 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1689 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1690 return; 1691 1692 pasv_error: 1693 (void) close(pdata); 1694 pdata = -1; 1695 perror_reply(425, "Can't open passive connection"); 1696 return; 1697 } 1698 1699 /* 1700 * Generate unique name for file with basename "local". 1701 * The file named "local" is already known to exist. 1702 * Generates failure reply on error. 1703 * 1704 * XXX this function should under go changes similar to 1705 * the mktemp(3)/mkstemp(3) changes. 1706 */ 1707 static char * 1708 gunique(local) 1709 char *local; 1710 { 1711 static char new[MAXPATHLEN]; 1712 struct stat st; 1713 int count, len; 1714 char *cp; 1715 1716 cp = strrchr(local, '/'); 1717 if (cp) 1718 *cp = '\0'; 1719 if (stat(cp ? local : ".", &st) < 0) { 1720 perror_reply(553, cp ? local : "."); 1721 return ((char *) 0); 1722 } 1723 if (cp) 1724 *cp = '/'; 1725 (void) strcpy(new, local); 1726 len = strlen(new); 1727 cp = new + len; 1728 *cp++ = '.'; 1729 for (count = 1; count < 100; count++) { 1730 (void)snprintf(cp, sizeof(new) - len - 2, "%d", count); 1731 if (stat(new, &st) < 0) 1732 return (new); 1733 } 1734 reply(452, "Unique file name cannot be created."); 1735 return (NULL); 1736 } 1737 1738 /* 1739 * Format and send reply containing system error number. 1740 */ 1741 void 1742 perror_reply(code, string) 1743 int code; 1744 char *string; 1745 { 1746 1747 reply(code, "%s: %s.", string, strerror(errno)); 1748 } 1749 1750 static char *onefile[] = { 1751 "", 1752 0 1753 }; 1754 1755 void 1756 send_file_list(whichf) 1757 char *whichf; 1758 { 1759 struct stat st; 1760 DIR *dirp = NULL; 1761 struct dirent *dir; 1762 FILE *dout = NULL; 1763 char **dirlist, *dirname; 1764 int simple = 0; 1765 int freeglob = 0; 1766 glob_t gl; 1767 #ifdef __GNUC__ 1768 (void) &dout; 1769 (void) &dirlist; 1770 (void) &simple; 1771 (void) &freeglob; 1772 #endif 1773 1774 if (strpbrk(whichf, "~{[*?") != NULL) { 1775 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 1776 1777 memset(&gl, 0, sizeof(gl)); 1778 freeglob = 1; 1779 if (glob(whichf, flags, 0, &gl)) { 1780 reply(550, "not found"); 1781 goto out; 1782 } else if (gl.gl_pathc == 0) { 1783 errno = ENOENT; 1784 perror_reply(550, whichf); 1785 goto out; 1786 } 1787 dirlist = gl.gl_pathv; 1788 } else { 1789 onefile[0] = whichf; 1790 dirlist = onefile; 1791 simple = 1; 1792 } 1793 1794 if (setjmp(urgcatch)) { 1795 transflag = 0; 1796 goto out; 1797 } 1798 while ((dirname = *dirlist++) != NULL) { 1799 int trailingslash = 0; 1800 1801 if (stat(dirname, &st) < 0) { 1802 /* 1803 * If user typed "ls -l", etc, and the client 1804 * used NLST, do what the user meant. 1805 */ 1806 if (dirname[0] == '-' && *dirlist == NULL && 1807 transflag == 0) { 1808 retrieve("/bin/ls %s", dirname); 1809 goto out; 1810 } 1811 perror_reply(550, whichf); 1812 if (dout != NULL) { 1813 (void) fclose(dout); 1814 transflag = 0; 1815 data = -1; 1816 pdata = -1; 1817 } 1818 goto out; 1819 } 1820 1821 if (S_ISREG(st.st_mode)) { 1822 if (dout == NULL) { 1823 dout = dataconn("file list", (off_t)-1, "w"); 1824 if (dout == NULL) 1825 goto out; 1826 transflag++; 1827 } 1828 fprintf(dout, "%s%s\n", dirname, 1829 type == TYPE_A ? "\r" : ""); 1830 byte_count += strlen(dirname) + 1; 1831 continue; 1832 } else if (!S_ISDIR(st.st_mode)) 1833 continue; 1834 1835 if (dirname[strlen(dirname) - 1] == '/') 1836 trailingslash++; 1837 1838 if ((dirp = opendir(dirname)) == NULL) 1839 continue; 1840 1841 while ((dir = readdir(dirp)) != NULL) { 1842 char nbuf[MAXPATHLEN]; 1843 1844 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1845 continue; 1846 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1847 dir->d_namlen == 2) 1848 continue; 1849 1850 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 1851 trailingslash ? "" : "/", dir->d_name); 1852 1853 /* 1854 * We have to do a stat to ensure it's 1855 * not a directory or special file. 1856 */ 1857 if (simple || (stat(nbuf, &st) == 0 && 1858 S_ISREG(st.st_mode))) { 1859 if (dout == NULL) { 1860 dout = dataconn("file list", (off_t)-1, 1861 "w"); 1862 if (dout == NULL) 1863 goto out; 1864 transflag++; 1865 } 1866 if (nbuf[0] == '.' && nbuf[1] == '/') 1867 fprintf(dout, "%s%s\n", &nbuf[2], 1868 type == TYPE_A ? "\r" : ""); 1869 else 1870 fprintf(dout, "%s%s\n", nbuf, 1871 type == TYPE_A ? "\r" : ""); 1872 byte_count += strlen(nbuf) + 1; 1873 } 1874 } 1875 (void) closedir(dirp); 1876 } 1877 1878 if (dout == NULL) 1879 reply(550, "No files found."); 1880 else if (ferror(dout) != 0) 1881 perror_reply(550, "Data connection"); 1882 else 1883 reply(226, "Transfer complete."); 1884 1885 transflag = 0; 1886 if (dout != NULL) 1887 (void) fclose(dout); 1888 data = -1; 1889 pdata = -1; 1890 out: 1891 if (freeglob) { 1892 freeglob = 0; 1893 globfree(&gl); 1894 } 1895 } 1896 1897 char * 1898 conffilename(s) 1899 const char *s; 1900 { 1901 static char filename[MAXPATHLEN]; 1902 1903 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 1904 return filename; 1905 } 1906
Indexes created Tue Oct 14 01:09:49 GMT 2025