ftpd.c revision 1.64
1 /* $NetBSD: ftpd.c,v 1.64 1999/05/19 21:44:29 thorpej 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 /* 37 * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc. 38 * All rights reserved. 39 * 40 * This code is derived from software contributed to The NetBSD Foundation 41 * by Luke Mewburn. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the NetBSD 54 * Foundation, Inc. and its contributors. 55 * 4. Neither the name of The NetBSD Foundation nor the names of its 56 * contributors may be used to endorse or promote products derived 57 * from this software without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 60 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 61 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 62 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 63 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 64 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 65 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 66 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 67 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 68 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 69 * POSSIBILITY OF SUCH DAMAGE. 70 */ 71 72 #include <sys/cdefs.h> 73 #ifndef lint 74 __COPYRIGHT( 75 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 76 The Regents of the University of California. All rights reserved.\n"); 77 #endif /* not lint */ 78 79 #ifndef lint 80 #if 0 81 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 82 #else 83 __RCSID("$NetBSD: ftpd.c,v 1.64 1999/05/19 21:44:29 thorpej Exp $"); 84 #endif 85 #endif /* not lint */ 86 87 /* 88 * FTP server. 89 */ 90 #include <sys/param.h> 91 #include <sys/stat.h> 92 #include <sys/ioctl.h> 93 #include <sys/socket.h> 94 #include <sys/wait.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_systm.h> 98 #include <netinet/ip.h> 99 100 #define FTP_NAMES 101 #include <arpa/ftp.h> 102 #include <arpa/inet.h> 103 #include <arpa/telnet.h> 104 105 #include <ctype.h> 106 #include <dirent.h> 107 #include <err.h> 108 #include <errno.h> 109 #include <fcntl.h> 110 #include <fnmatch.h> 111 #include <glob.h> 112 #include <limits.h> 113 #include <netdb.h> 114 #include <pwd.h> 115 #include <setjmp.h> 116 #include <signal.h> 117 #include <stdio.h> 118 #include <stdlib.h> 119 #include <string.h> 120 #include <syslog.h> 121 #include <time.h> 122 #include <unistd.h> 123 #ifdef SKEY 124 #include <skey.h> 125 #endif 126 #ifdef KERBEROS5 127 #include <krb5.h> 128 #endif 129 130 #include "extern.h" 131 #include "pathnames.h" 132 133 #if __STDC__ 134 #include <stdarg.h> 135 #else 136 #include <varargs.h> 137 #endif 138 139 #ifndef TRUE 140 #define TRUE 1 141 #define FALSE 0 142 #endif 143 144 const char version[] = "Version: 7.2.0"; 145 146 struct sockaddr_in ctrl_addr; 147 struct sockaddr_in data_source; 148 struct sockaddr_in data_dest; 149 struct sockaddr_in his_addr; 150 struct sockaddr_in pasv_addr; 151 152 int data; 153 jmp_buf errcatch, urgcatch; 154 int logged_in; 155 struct passwd *pw; 156 int debug; 157 int sflag; 158 int logging; 159 int guest; 160 int dochroot; 161 int type; 162 int form; 163 int stru; /* avoid C keyword */ 164 int mode; 165 int usedefault = 1; /* for data transfers */ 166 int pdata = -1; /* for passive mode */ 167 sig_atomic_t transflag; 168 off_t file_size; 169 off_t byte_count; 170 char tmpline[7]; 171 char hostname[MAXHOSTNAMELEN+1]; 172 char remotehost[MAXHOSTNAMELEN+1]; 173 static char ttyline[20]; 174 char *tty = ttyline; /* for klogin */ 175 176 off_t total_data_in; /* total file data bytes received */ 177 off_t total_data_out; /* total file data bytes sent data */ 178 off_t total_data; /* total file data bytes transferred data */ 179 off_t total_files_in; /* total number of data files received */ 180 off_t total_files_out; /* total number of data files sent */ 181 off_t total_files; /* total number of data files transferred */ 182 off_t total_bytes_in; /* total bytes received */ 183 off_t total_bytes_out; /* total bytes sent */ 184 off_t total_bytes; /* total bytes transferred */ 185 off_t total_xfers_in; /* total number of xfers incoming */ 186 off_t total_xfers_out; /* total number of xfers outgoing */ 187 off_t total_xfers; /* total number of xfers */ 188 189 static char *anondir = NULL; 190 static char confdir[MAXPATHLEN]; 191 192 #if defined(KERBEROS) || defined(KERBEROS5) 193 int notickets = 1; 194 char *krbtkfile_env = NULL; 195 #endif 196 197 /* 198 * Timeout intervals for retrying connections 199 * to hosts that don't accept PORT cmds. This 200 * is a kludge, but given the problems with TCP... 201 */ 202 #define SWAITMAX 90 /* wait at most 90 seconds */ 203 #define SWAITINT 5 /* interval between retries */ 204 205 int swaitmax = SWAITMAX; 206 int swaitint = SWAITINT; 207 208 #ifdef HASSETPROCTITLE 209 char proctitle[BUFSIZ]; /* initial part of title */ 210 #endif /* HASSETPROCTITLE */ 211 212 static void ack __P((const char *)); 213 static void myoob __P((int)); 214 static int checkuser __P((const char *, const char *, int, int)); 215 static int checkaccess __P((const char *)); 216 static FILE *dataconn __P((const char *, off_t, const char *)); 217 static void dolog __P((struct sockaddr_in *)); 218 static void end_login __P((void)); 219 static FILE *getdatasock __P((const char *)); 220 static char *gunique __P((const char *)); 221 static void lostconn __P((int)); 222 static int receive_data __P((FILE *, FILE *)); 223 static void replydirname __P((const char *, const char *)); 224 static int send_data __P((FILE *, FILE *, off_t, int)); 225 static struct passwd * 226 sgetpwnam __P((const char *)); 227 228 int main __P((int, char *[])); 229 230 #if defined(KERBEROS) || defined(KERBEROS5) 231 int klogin __P((struct passwd *, char *, char *, char *)); 232 void kdestroy __P((void)); 233 #endif 234 235 int 236 main(argc, argv) 237 int argc; 238 char *argv[]; 239 { 240 int addrlen, ch, on = 1, tos; 241 char *cp, line[LINE_MAX]; 242 FILE *fd; 243 #ifdef KERBEROS5 244 krb5_error_code kerror; 245 #endif 246 247 debug = 0; 248 logging = 0; 249 sflag = 0; 250 (void)strcpy(confdir, _DEFAULT_CONFDIR); 251 252 while ((ch = getopt(argc, argv, "a:c:C:dlst:T:u:v")) != -1) { 253 switch (ch) { 254 case 'a': 255 anondir = optarg; 256 break; 257 258 case 'c': 259 (void)strncpy(confdir, optarg, sizeof(confdir)); 260 confdir[sizeof(confdir)-1] = '\0'; 261 break; 262 263 case 'C': 264 exit(checkaccess(optarg)); 265 /* NOTREACHED */ 266 267 case 'd': 268 case 'v': /* deprecated */ 269 debug = 1; 270 break; 271 272 case 'l': 273 logging++; /* > 1 == extra logging */ 274 break; 275 276 case 's': 277 sflag = 1; 278 break; 279 280 case 't': 281 case 'T': 282 case 'u': 283 warnx("-%c has been deprecated in favour of ftpd.conf", 284 ch); 285 break; 286 287 default: 288 if (optopt == 'a' || optopt == 'C') 289 exit(1); 290 warnx("unknown flag -%c ignored", optopt); 291 break; 292 } 293 } 294 295 /* 296 * LOG_NDELAY sets up the logging connection immediately, 297 * necessary for anonymous ftp's that chroot and can't do it later. 298 */ 299 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 300 addrlen = sizeof(his_addr); 301 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 302 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 303 exit(1); 304 } 305 addrlen = sizeof(ctrl_addr); 306 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 307 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 308 exit(1); 309 } 310 #ifdef IP_TOS 311 tos = IPTOS_LOWDELAY; 312 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 313 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 314 #endif 315 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 316 317 /* set this here so klogin can use it... */ 318 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 319 320 (void) freopen(_PATH_DEVNULL, "w", stderr); 321 (void) signal(SIGPIPE, lostconn); 322 (void) signal(SIGCHLD, SIG_IGN); 323 if ((long)signal(SIGURG, myoob) < 0) 324 syslog(LOG_ERR, "signal: %m"); 325 326 /* Try to handle urgent data inline */ 327 #ifdef SO_OOBINLINE 328 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 329 syslog(LOG_ERR, "setsockopt: %m"); 330 #endif 331 332 #ifdef F_SETOWN 333 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 334 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 335 #endif 336 dolog(&his_addr); 337 /* 338 * Set up default state 339 */ 340 data = -1; 341 type = TYPE_A; 342 form = FORM_N; 343 stru = STRU_F; 344 mode = MODE_S; 345 tmpline[0] = '\0'; 346 hasyyerrored = 0; 347 348 #ifdef KERBEROS5 349 kerror = krb5_init_context(&kcontext); 350 if (kerror) { 351 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 352 error_message(kerror)); 353 exit(0); 354 } 355 #endif /* KERBEROS5 */ 356 357 /* If logins are disabled, print out the message. */ 358 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 359 lreply(530, ""); 360 while (fgets(line, sizeof(line), fd) != NULL) { 361 if ((cp = strchr(line, '\n')) != NULL) 362 *cp = '\0'; 363 lreply(0, "%s", line); 364 } 365 (void) fflush(stdout); 366 (void) fclose(fd); 367 reply(530, "System not available."); 368 exit(0); 369 } 370 if ((fd = fopen(conffilename(_PATH_FTPWELCOME), "r")) != NULL) { 371 lreply(220, ""); 372 while (fgets(line, sizeof(line), fd) != NULL) { 373 if ((cp = strchr(line, '\n')) != NULL) 374 *cp = '\0'; 375 lreply(0, "%s", line); 376 } 377 (void) fflush(stdout); 378 (void) fclose(fd); 379 /* reply(220,) must follow */ 380 } 381 (void)gethostname(hostname, sizeof(hostname)); 382 hostname[sizeof(hostname) - 1] = '\0'; 383 reply(220, "%s FTP server (%s) ready.", hostname, version); 384 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 385 (void) setjmp(errcatch); 386 for (;;) 387 (void) yyparse(); 388 /* NOTREACHED */ 389 } 390 391 static void 392 lostconn(signo) 393 int signo; 394 { 395 396 if (debug) 397 syslog(LOG_DEBUG, "lost connection"); 398 dologout(1); 399 } 400 401 /* 402 * Save the result of a getpwnam. Used for USER command, since 403 * the data returned must not be clobbered by any other command 404 * (e.g., globbing). 405 */ 406 static struct passwd * 407 sgetpwnam(name) 408 const char *name; 409 { 410 static struct passwd save; 411 struct passwd *p; 412 413 if ((p = getpwnam(name)) == NULL) 414 return (p); 415 if (save.pw_name) { 416 free((char *)save.pw_name); 417 free((char *)save.pw_passwd); 418 free((char *)save.pw_gecos); 419 free((char *)save.pw_dir); 420 free((char *)save.pw_shell); 421 } 422 save = *p; 423 save.pw_name = xstrdup(p->pw_name); 424 save.pw_passwd = xstrdup(p->pw_passwd); 425 save.pw_gecos = xstrdup(p->pw_gecos); 426 save.pw_dir = xstrdup(p->pw_dir); 427 save.pw_shell = xstrdup(p->pw_shell); 428 return (&save); 429 } 430 431 static int login_attempts; /* number of failed login attempts */ 432 static int askpasswd; /* had user command, ask for passwd */ 433 static char curname[10]; /* current USER name */ 434 435 /* 436 * USER command. 437 * Sets global passwd pointer pw if named account exists and is acceptable; 438 * sets askpasswd if a PASS command is expected. If logged in previously, 439 * need to reset state. If name is "ftp" or "anonymous", the name is not in 440 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 441 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 442 * requesting login privileges. Disallow anyone who does not have a standard 443 * shell as returned by getusershell(). Disallow anyone mentioned in the file 444 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 445 */ 446 void 447 user(name) 448 const char *name; 449 { 450 if (logged_in) { 451 if (guest) { 452 reply(530, "Can't change user from guest login."); 453 return; 454 } else if (dochroot) { 455 reply(530, "Can't change user from chroot user."); 456 return; 457 } 458 end_login(); 459 } 460 461 #if defined(KERBEROS) || defined(KERBEROS5) 462 kdestroy(); 463 #endif 464 465 guest = 0; 466 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 467 if (checkaccess("ftp") || checkaccess("anonymous")) 468 reply(530, "User %s access denied.", name); 469 else if ((pw = sgetpwnam("ftp")) != NULL) { 470 guest = 1; 471 askpasswd = 1; 472 reply(331, 473 "Guest login ok, type your name as password."); 474 } else 475 reply(530, "User %s unknown.", name); 476 if (!askpasswd && logging) 477 syslog(LOG_NOTICE, 478 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 479 return; 480 } 481 482 pw = sgetpwnam(name); 483 if (logging) 484 strncpy(curname, name, sizeof(curname)-1); 485 486 #ifdef SKEY 487 if (skey_haskey(name) == 0) { 488 char *myskey; 489 490 myskey = skey_keyinfo(name); 491 reply(331, "Password [%s] required for %s.", 492 myskey ? myskey : "error getting challenge", name); 493 } else 494 #endif 495 reply(331, "Password required for %s.", name); 496 497 askpasswd = 1; 498 /* 499 * Delay before reading passwd after first failed 500 * attempt to slow down passwd-guessing programs. 501 */ 502 if (login_attempts) 503 sleep((unsigned) login_attempts); 504 } 505 506 /* 507 * Determine whether something is to happen (allow access, chroot) 508 * for a user. Each line is a shell-style glob followed by 509 * `yes' or `no'. 510 * 511 * For backward compatability, `allow' and `deny' are synonymns 512 * for `yes' and `no', respectively. 513 * 514 * Each glob is matched against the username in turn, and the first 515 * match found is used. If no match is found, the result is the 516 * argument `def'. If a match is found but without and explicit 517 * `yes'/`no', the result is the opposite of def. 518 * 519 * If the file doesn't exist at all, the result is the argument 520 * `nofile' 521 * 522 * Any line starting with `#' is considered a comment and ignored. 523 * 524 * Returns FALSE if the user is denied, or TRUE if they are allowed. 525 */ 526 int 527 checkuser(fname, name, def, nofile) 528 const char *fname, *name; 529 int def, nofile; 530 { 531 FILE *fd; 532 int retval; 533 char *glob, *perm, line[BUFSIZ]; 534 535 retval = def; 536 if ((fd = fopen(conffilename(fname), "r")) == NULL) 537 return nofile; 538 539 while (fgets(line, sizeof(line), fd) != NULL) { 540 glob = strtok(line, " \t\n"); 541 if (glob[0] == '#') 542 continue; 543 perm = strtok(NULL, " \t\n"); 544 if (fnmatch(glob, name, 0) == 0) { 545 if (perm != NULL && 546 ((strcasecmp(perm, "allow") == 0) || 547 (strcasecmp(perm, "yes") == 0))) 548 retval = TRUE; 549 else if (perm != NULL && 550 ((strcasecmp(perm, "deny") == 0) || 551 (strcasecmp(perm, "no") == 0))) 552 retval = FALSE; 553 else 554 retval = !def; 555 break; 556 } 557 } 558 (void) fclose(fd); 559 return (retval); 560 } 561 562 /* 563 * Check if user is allowed by /etc/ftpusers 564 * returns 0 for yes, 1 for no 565 */ 566 int 567 checkaccess(name) 568 const char *name; 569 { 570 571 return (! checkuser(_PATH_FTPUSERS, name, TRUE, FALSE)); 572 } 573 574 /* 575 * Terminate login as previous user, if any, resetting state; 576 * used when USER command is given or login fails. 577 */ 578 static void 579 end_login() 580 { 581 582 (void) seteuid((uid_t)0); 583 if (logged_in) 584 logwtmp(ttyline, "", ""); 585 pw = NULL; 586 logged_in = 0; 587 guest = 0; 588 dochroot = 0; 589 } 590 591 void 592 pass(passwd) 593 const char *passwd; 594 { 595 int rval; 596 FILE *fd; 597 char const *cp, *shell, *home; 598 599 if (logged_in || askpasswd == 0) { 600 reply(503, "Login with USER first."); 601 return; 602 } 603 askpasswd = 0; 604 if (!guest) { /* "ftp" is only account allowed no password */ 605 if (pw == NULL) { 606 rval = 1; /* failure below */ 607 goto skip; 608 } 609 #ifdef KERBEROS 610 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 611 rval = 0; 612 goto skip; 613 } 614 #endif 615 #ifdef KERBEROS5 616 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 617 rval = 0; 618 goto skip; 619 } 620 #endif 621 #ifdef SKEY 622 if (skey_haskey(pw->pw_name) == 0) { 623 char *p; 624 int r; 625 626 p = xstrdup(passwd); 627 r = skey_passcheck(pw->pw_name, p); 628 free(p); 629 if (r != -1) { 630 rval = 0; 631 goto skip; 632 } 633 } 634 #endif 635 if (!sflag && *pw->pw_passwd != '\0' && 636 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 637 rval = 0; 638 goto skip; 639 } 640 rval = 1; 641 642 skip: 643 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 644 rval = 2; 645 /* 646 * If rval > 0, the user failed the authentication check 647 * above. If rval == 0, either Kerberos or local authentication 648 * succeeded. 649 */ 650 if (rval) { 651 reply(530, rval == 2 ? "Password expired." : 652 "Login incorrect."); 653 if (logging) { 654 syslog(LOG_NOTICE, 655 "FTP LOGIN FAILED FROM %s", remotehost); 656 syslog(LOG_AUTHPRIV | LOG_NOTICE, 657 "FTP LOGIN FAILED FROM %s, %s", 658 remotehost, curname); 659 } 660 pw = NULL; 661 if (login_attempts++ >= 5) { 662 syslog(LOG_NOTICE, 663 "repeated login failures from %s", 664 remotehost); 665 exit(0); 666 } 667 return; 668 } 669 } 670 671 /* password was ok; see if anything else prevents login */ 672 if (checkaccess(pw->pw_name)) { 673 reply(530, "User %s may not use FTP.", pw->pw_name); 674 if (logging) 675 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 676 remotehost, pw->pw_name); 677 pw = (struct passwd *) NULL; 678 return; 679 } 680 /* check for valid shell, if not guest user */ 681 if ((shell = pw->pw_shell) == NULL || *shell == 0) 682 shell = _PATH_BSHELL; 683 while ((cp = getusershell()) != NULL) 684 if (strcmp(cp, shell) == 0) 685 break; 686 endusershell(); 687 if (cp == NULL && guest == 0) { 688 reply(530, "User %s may not use FTP.", pw->pw_name); 689 if (logging) 690 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 691 remotehost, pw->pw_name); 692 pw = (struct passwd *) NULL; 693 return; 694 } 695 696 login_attempts = 0; /* this time successful */ 697 if (setegid((gid_t)pw->pw_gid) < 0) { 698 reply(550, "Can't set gid."); 699 return; 700 } 701 (void) initgroups(pw->pw_name, pw->pw_gid); 702 703 /* open wtmp before chroot */ 704 logwtmp(ttyline, pw->pw_name, remotehost); 705 logged_in = 1; 706 707 dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name, FALSE, FALSE); 708 709 /* parse ftpd.conf, setting up various parameters */ 710 if (guest) 711 parse_conf(CLASS_GUEST); 712 else if (dochroot) 713 parse_conf(CLASS_CHROOT); 714 else 715 parse_conf(CLASS_REAL); 716 717 home = "/"; 718 if (guest) { 719 /* 720 * We MUST do a chdir() after the chroot. Otherwise 721 * the old current directory will be accessible as "." 722 * outside the new root! 723 */ 724 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 725 chdir("/") < 0) { 726 reply(550, "Can't set guest privileges."); 727 goto bad; 728 } 729 } else if (dochroot) { 730 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 731 reply(550, "Can't change root."); 732 goto bad; 733 } 734 } else if (chdir(pw->pw_dir) < 0) { 735 if (chdir("/") < 0) { 736 reply(530, "User %s: can't change directory to %s.", 737 pw->pw_name, pw->pw_dir); 738 goto bad; 739 } else 740 lreply(230, "No directory! Logging in with home=/"); 741 } else 742 home = pw->pw_dir; 743 if (seteuid((uid_t)pw->pw_uid) < 0) { 744 reply(550, "Can't set uid."); 745 goto bad; 746 } 747 setenv("HOME", home, 1); 748 749 750 /* 751 * Display a login message, if it exists. 752 * N.B. reply(230,) must follow the message. 753 */ 754 if ((fd = fopen(conffilename(_PATH_FTPLOGINMESG), "r")) != NULL) { 755 char *cp, line[LINE_MAX]; 756 757 lreply(230, ""); 758 while (fgets(line, sizeof(line), fd) != NULL) { 759 if ((cp = strchr(line, '\n')) != NULL) 760 *cp = '\0'; 761 lreply(0, "%s", line); 762 } 763 (void) fflush(stdout); 764 (void) fclose(fd); 765 } 766 show_chdir_messages(230); 767 if (guest) { 768 reply(230, "Guest login ok, access restrictions apply."); 769 #ifdef HASSETPROCTITLE 770 snprintf(proctitle, sizeof(proctitle), 771 "%s: anonymous/%.*s", remotehost, 772 (int) (sizeof(proctitle) - sizeof(remotehost) - 773 sizeof(": anonymous/")), passwd); 774 setproctitle(proctitle); 775 #endif /* HASSETPROCTITLE */ 776 if (logging) 777 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 778 remotehost, passwd); 779 } else { 780 reply(230, "User %s logged in.", pw->pw_name); 781 #ifdef HASSETPROCTITLE 782 snprintf(proctitle, sizeof(proctitle), 783 "%s: %s", remotehost, pw->pw_name); 784 setproctitle(proctitle); 785 #endif /* HASSETPROCTITLE */ 786 if (logging) 787 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 788 remotehost, pw->pw_name); 789 } 790 (void) umask(curclass.umask); 791 return; 792 bad: 793 /* Forget all about it... */ 794 end_login(); 795 } 796 797 void 798 retrieve(cmd, name) 799 const char *cmd, *name; 800 { 801 FILE *fin = NULL, *dout; 802 struct stat st; 803 int (*closefunc) __P((FILE *)) = NULL; 804 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 805 struct timeval start, finish, td, *tdp; 806 char tline[BUFSIZ]; 807 const char *dispname; 808 809 sendrv = closerv = stderrfd = -1; 810 isconversion = isdata = isls = log = 0; 811 tdp = NULL; 812 dispname = name; 813 if (cmd == NULL) { 814 log = 1; 815 isdata = 1; 816 fin = fopen(name, "r"); 817 closefunc = fclose; 818 if (fin == NULL) 819 cmd = do_conversion(name); 820 if (cmd != NULL) { 821 isconversion++; 822 syslog(LOG_INFO, "get command: '%s'", cmd); 823 } 824 } 825 if (cmd != NULL) { 826 char temp[MAXPATHLEN + 1]; 827 828 if (strncmp(cmd, INTERNAL_LS, sizeof(INTERNAL_LS) - 1) == 0 && 829 strchr(" \t\n", cmd[sizeof(INTERNAL_LS) - 1]) != NULL) { 830 isls = 1; 831 stderrfd = -1; 832 } else { 833 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 834 stderrfd = mkstemp(temp); 835 if (stderrfd != -1) 836 (void)unlink(temp); 837 } 838 (void)snprintf(tline, sizeof(tline), cmd, name); 839 dispname = tline; 840 fin = ftpd_popen(tline, "r", stderrfd); 841 closefunc = ftpd_pclose; 842 st.st_size = -1; 843 st.st_blksize = BUFSIZ; 844 } 845 if (fin == NULL) { 846 if (errno != 0) { 847 perror_reply(550, dispname); 848 if (log) 849 logcmd("get", -1, name, NULL, NULL, 850 strerror(errno)); 851 } 852 if (stderrfd != -1) 853 (void)close(stderrfd); 854 return; 855 } 856 byte_count = -1; 857 if (cmd == NULL 858 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 859 reply(550, "%s: not a plain file.", dispname); 860 goto done; 861 } 862 if (restart_point) { 863 if (type == TYPE_A) { 864 off_t i; 865 int c; 866 867 for (i = 0; i < restart_point; i++) { 868 if ((c=getc(fin)) == EOF) { 869 perror_reply(550, dispname); 870 goto done; 871 } 872 if (c == '\n') 873 i++; 874 } 875 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 876 perror_reply(550, dispname); 877 goto done; 878 } 879 } 880 dout = dataconn(dispname, st.st_size, "w"); 881 if (dout == NULL) 882 goto done; 883 884 (void)gettimeofday(&start, NULL); 885 sendrv = send_data(fin, dout, st.st_blksize, isdata); 886 (void)gettimeofday(&finish, NULL); 887 (void) fclose(dout); 888 timersub(&finish, &start, &td); 889 tdp = &td; 890 data = -1; 891 pdata = -1; 892 done: 893 if (log) 894 logcmd("get", byte_count, name, NULL, tdp, NULL); 895 closerv = (*closefunc)(fin); 896 if (sendrv == 0) { 897 FILE *err; 898 struct stat sb; 899 900 if (!isls && cmd != NULL && closerv != 0) { 901 lreply(226, 902 "Command returned an exit status of %d", 903 closerv); 904 if (isconversion) 905 syslog(LOG_INFO, 906 "get command: '%s' returned %d", 907 cmd, closerv); 908 } 909 if (!isls && cmd != NULL && stderrfd != -1 && 910 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 911 ((err = fdopen(stderrfd, "r")) != NULL)) { 912 char *cp, line[LINE_MAX]; 913 914 lreply(226, "Command error messages:"); 915 rewind(err); 916 while (fgets(line, sizeof(line), err) != NULL) { 917 if ((cp = strchr(line, '\n')) != NULL) 918 *cp = '\0'; 919 lreply(0, " %s", line); 920 } 921 (void) fflush(stdout); 922 (void) fclose(err); 923 /* a reply(226,) must follow */ 924 } 925 reply(226, "Transfer complete."); 926 } 927 if (stderrfd != -1) 928 (void)close(stderrfd); 929 } 930 931 void 932 store(name, mode, unique) 933 const char *name, *mode; 934 int unique; 935 { 936 FILE *fout, *din; 937 struct stat st; 938 int (*closefunc) __P((FILE *)); 939 struct timeval start, finish, td, *tdp; 940 char *desc; 941 942 desc = (*mode == 'w') ? "put" : "append"; 943 if (unique && stat(name, &st) == 0 && 944 (name = gunique(name)) == NULL) { 945 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 946 return; 947 } 948 949 if (restart_point) 950 mode = "r+"; 951 fout = fopen(name, mode); 952 closefunc = fclose; 953 tdp = NULL; 954 if (fout == NULL) { 955 perror_reply(553, name); 956 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 957 return; 958 } 959 byte_count = -1; 960 if (restart_point) { 961 if (type == TYPE_A) { 962 off_t i; 963 int c; 964 965 for (i = 0; i < restart_point; i++) { 966 if ((c=getc(fout)) == EOF) { 967 perror_reply(550, name); 968 goto done; 969 } 970 if (c == '\n') 971 i++; 972 } 973 /* 974 * We must do this seek to "current" position 975 * because we are changing from reading to 976 * writing. 977 */ 978 if (fseek(fout, 0L, SEEK_CUR) < 0) { 979 perror_reply(550, name); 980 goto done; 981 } 982 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 983 perror_reply(550, name); 984 goto done; 985 } 986 } 987 din = dataconn(name, (off_t)-1, "r"); 988 if (din == NULL) 989 goto done; 990 (void)gettimeofday(&start, NULL); 991 if (receive_data(din, fout) == 0) { 992 if (unique) 993 reply(226, "Transfer complete (unique file name:%s).", 994 name); 995 else 996 reply(226, "Transfer complete."); 997 } 998 (void)gettimeofday(&finish, NULL); 999 (void) fclose(din); 1000 timersub(&finish, &start, &td); 1001 tdp = &td; 1002 data = -1; 1003 pdata = -1; 1004 done: 1005 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1006 (*closefunc)(fout); 1007 } 1008 1009 static FILE * 1010 getdatasock(mode) 1011 const char *mode; 1012 { 1013 int on = 1, s, t, tries; 1014 1015 if (data >= 0) 1016 return (fdopen(data, mode)); 1017 (void) seteuid((uid_t)0); 1018 s = socket(AF_INET, SOCK_STREAM, 0); 1019 if (s < 0) 1020 goto bad; 1021 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1022 (char *) &on, sizeof(on)) < 0) 1023 goto bad; 1024 /* anchor socket to avoid multi-homing problems */ 1025 data_source.sin_len = sizeof(struct sockaddr_in); 1026 data_source.sin_family = AF_INET; 1027 data_source.sin_addr = ctrl_addr.sin_addr; 1028 for (tries = 1; ; tries++) { 1029 if (bind(s, (struct sockaddr *)&data_source, 1030 sizeof(data_source)) >= 0) 1031 break; 1032 if (errno != EADDRINUSE || tries > 10) 1033 goto bad; 1034 sleep(tries); 1035 } 1036 (void) seteuid((uid_t)pw->pw_uid); 1037 #ifdef IP_TOS 1038 on = IPTOS_THROUGHPUT; 1039 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 1040 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1041 #endif 1042 return (fdopen(s, mode)); 1043 bad: 1044 /* Return the real value of errno (close may change it) */ 1045 t = errno; 1046 (void) seteuid((uid_t)pw->pw_uid); 1047 (void) close(s); 1048 errno = t; 1049 return (NULL); 1050 } 1051 1052 static FILE * 1053 dataconn(name, size, mode) 1054 const char *name; 1055 off_t size; 1056 const char *mode; 1057 { 1058 char sizebuf[32]; 1059 FILE *file; 1060 int retry = 0, tos; 1061 1062 file_size = size; 1063 byte_count = 0; 1064 if (size != (off_t) -1) 1065 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1066 (long long)size, PLURAL(size)); 1067 else 1068 sizebuf[0] = '\0'; 1069 if (pdata >= 0) { 1070 struct sockaddr_in from; 1071 int s, fromlen = sizeof(from); 1072 1073 (void) alarm(curclass.timeout); 1074 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1075 (void) alarm(0); 1076 if (s < 0) { 1077 reply(425, "Can't open data connection."); 1078 (void) close(pdata); 1079 pdata = -1; 1080 return (NULL); 1081 } 1082 (void) close(pdata); 1083 pdata = s; 1084 #ifdef IP_TOS 1085 tos = IPTOS_THROUGHPUT; 1086 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1087 sizeof(int)); 1088 #endif 1089 reply(150, "Opening %s mode data connection for '%s'%s.", 1090 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1091 return (fdopen(pdata, mode)); 1092 } 1093 if (data >= 0) { 1094 reply(125, "Using existing data connection for '%s'%s.", 1095 name, sizebuf); 1096 usedefault = 1; 1097 return (fdopen(data, mode)); 1098 } 1099 if (usedefault) 1100 data_dest = his_addr; 1101 usedefault = 1; 1102 file = getdatasock(mode); 1103 if (file == NULL) { 1104 reply(425, "Can't create data socket (%s,%d): %s.", 1105 inet_ntoa(data_source.sin_addr), 1106 ntohs(data_source.sin_port), strerror(errno)); 1107 return (NULL); 1108 } 1109 data = fileno(file); 1110 while (connect(data, (struct sockaddr *)&data_dest, 1111 sizeof(data_dest)) < 0) { 1112 if (errno == EADDRINUSE && retry < swaitmax) { 1113 sleep((unsigned) swaitint); 1114 retry += swaitint; 1115 continue; 1116 } 1117 perror_reply(425, "Can't build data connection"); 1118 (void) fclose(file); 1119 data = -1; 1120 return (NULL); 1121 } 1122 reply(150, "Opening %s mode data connection for '%s'%s.", 1123 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1124 return (file); 1125 } 1126 1127 /* 1128 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1129 * encapsulation of the data subject * to Mode, Structure, and Type. 1130 * 1131 * NB: Form isn't handled. 1132 */ 1133 static int 1134 send_data(instr, outstr, blksize, isdata) 1135 FILE *instr, *outstr; 1136 off_t blksize; 1137 int isdata; 1138 { 1139 int c, cnt, filefd, netfd, rval; 1140 char *buf; 1141 1142 transflag = 1; 1143 rval = -1; 1144 buf = NULL; 1145 if (setjmp(urgcatch)) 1146 goto cleanup_send_data; 1147 1148 switch (type) { 1149 1150 case TYPE_A: 1151 (void) alarm(curclass.timeout); 1152 while ((c = getc(instr)) != EOF) { 1153 byte_count++; 1154 if (c == '\n') { 1155 if (ferror(outstr)) 1156 goto data_err; 1157 (void) putc('\r', outstr); 1158 if (isdata) { 1159 total_data_out++; 1160 total_data++; 1161 } 1162 total_bytes_out++; 1163 total_bytes++; 1164 } 1165 (void) putc(c, outstr); 1166 if (isdata) { 1167 total_data_out++; 1168 total_data++; 1169 } 1170 total_bytes_out++; 1171 total_bytes++; 1172 if ((byte_count % 4096) == 0) 1173 (void) alarm(curclass.timeout); 1174 } 1175 (void) alarm(0); 1176 fflush(outstr); 1177 if (ferror(instr)) 1178 goto file_err; 1179 if (ferror(outstr)) 1180 goto data_err; 1181 rval = 0; 1182 goto cleanup_send_data; 1183 1184 case TYPE_I: 1185 case TYPE_L: 1186 if ((buf = malloc((size_t)blksize)) == NULL) { 1187 perror_reply(451, "Local resource failure: malloc"); 1188 goto cleanup_send_data; 1189 } 1190 filefd = fileno(instr); 1191 netfd = fileno(outstr); 1192 (void) alarm(curclass.timeout); 1193 while ((cnt = read(filefd, buf, (size_t)blksize)) > 0) { 1194 if (write(netfd, buf, cnt) != cnt) 1195 goto data_err; 1196 (void) alarm(curclass.timeout); 1197 byte_count += cnt; 1198 if (isdata) { 1199 total_data_out += cnt; 1200 total_data += cnt; 1201 } 1202 total_bytes_out += cnt; 1203 total_bytes += cnt; 1204 } 1205 if (cnt < 0) 1206 goto file_err; 1207 rval = 0; 1208 goto cleanup_send_data; 1209 1210 default: 1211 reply(550, "Unimplemented TYPE %d in send_data", type); 1212 goto cleanup_send_data; 1213 } 1214 1215 data_err: 1216 (void) alarm(0); 1217 perror_reply(426, "Data connection"); 1218 goto cleanup_send_data; 1219 1220 file_err: 1221 (void) alarm(0); 1222 perror_reply(551, "Error on input file"); 1223 /* FALLTHROUGH */ 1224 1225 cleanup_send_data: 1226 (void) alarm(0); 1227 transflag = 0; 1228 if (buf) 1229 free(buf); 1230 if (isdata) { 1231 total_files_out++; 1232 total_files++; 1233 } 1234 total_xfers_out++; 1235 total_xfers++; 1236 return (rval); 1237 } 1238 1239 /* 1240 * Transfer data from peer to "outstr" using the appropriate encapulation of 1241 * the data subject to Mode, Structure, and Type. 1242 * 1243 * N.B.: Form isn't handled. 1244 */ 1245 static int 1246 receive_data(instr, outstr) 1247 FILE *instr, *outstr; 1248 { 1249 int c, cnt, bare_lfs, netfd, filefd, rval; 1250 char buf[BUFSIZ]; 1251 #ifdef __GNUC__ 1252 (void) &bare_lfs; 1253 #endif 1254 1255 bare_lfs = 0; 1256 transflag = 1; 1257 rval = -1; 1258 if (setjmp(urgcatch)) 1259 goto cleanup_recv_data; 1260 1261 switch (type) { 1262 1263 case TYPE_I: 1264 case TYPE_L: 1265 netfd = fileno(instr); 1266 filefd = fileno(outstr); 1267 (void) alarm(curclass.timeout); 1268 while ((cnt = read(netfd, buf, sizeof(buf))) > 0) { 1269 if (write(filefd, buf, cnt) != cnt) 1270 goto file_err; 1271 (void) alarm(curclass.timeout); 1272 byte_count += cnt; 1273 total_data_in += cnt; 1274 total_data += cnt; 1275 total_bytes_in += cnt; 1276 total_bytes += cnt; 1277 } 1278 if (cnt < 0) 1279 goto data_err; 1280 rval = 0; 1281 goto cleanup_recv_data; 1282 1283 case TYPE_E: 1284 reply(553, "TYPE E not implemented."); 1285 goto cleanup_recv_data; 1286 1287 case TYPE_A: 1288 (void) alarm(curclass.timeout); 1289 while ((c = getc(instr)) != EOF) { 1290 byte_count++; 1291 total_data_in++; 1292 total_data++; 1293 total_bytes_in++; 1294 total_bytes++; 1295 if ((byte_count % 4096) == 0) 1296 (void) alarm(curclass.timeout); 1297 if (c == '\n') 1298 bare_lfs++; 1299 while (c == '\r') { 1300 if (ferror(outstr)) 1301 goto data_err; 1302 if ((c = getc(instr)) != '\n') { 1303 byte_count++; 1304 total_data_in++; 1305 total_data++; 1306 total_bytes_in++; 1307 total_bytes++; 1308 if ((byte_count % 4096) == 0) 1309 (void) alarm(curclass.timeout); 1310 (void) putc ('\r', outstr); 1311 if (c == '\0' || c == EOF) 1312 goto contin2; 1313 } 1314 } 1315 (void) putc(c, outstr); 1316 contin2: ; 1317 } 1318 (void) alarm(0); 1319 fflush(outstr); 1320 if (ferror(instr)) 1321 goto data_err; 1322 if (ferror(outstr)) 1323 goto file_err; 1324 if (bare_lfs) { 1325 lreply(226, 1326 "WARNING! %d bare linefeeds received in ASCII mode", 1327 bare_lfs); 1328 lreply(0, "File may not have transferred correctly."); 1329 } 1330 rval = 0; 1331 goto cleanup_recv_data; 1332 1333 default: 1334 reply(550, "Unimplemented TYPE %d in receive_data", type); 1335 goto cleanup_recv_data; 1336 } 1337 1338 data_err: 1339 (void) alarm(0); 1340 perror_reply(426, "Data Connection"); 1341 goto cleanup_recv_data; 1342 1343 file_err: 1344 (void) alarm(0); 1345 perror_reply(452, "Error writing file"); 1346 goto cleanup_recv_data; 1347 1348 cleanup_recv_data: 1349 (void) alarm(0); 1350 transflag = 0; 1351 total_files_in++; 1352 total_files++; 1353 total_xfers_in++; 1354 total_xfers++; 1355 return (rval); 1356 } 1357 1358 void 1359 statfilecmd(filename) 1360 const char *filename; 1361 { 1362 FILE *fin; 1363 int c; 1364 char line[LINE_MAX]; 1365 1366 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1367 fin = ftpd_popen(line, "r", STDOUT_FILENO); 1368 lreply(211, "status of %s:", filename); 1369 while ((c = getc(fin)) != EOF) { 1370 if (c == '\n') { 1371 if (ferror(stdout)){ 1372 perror_reply(421, "control connection"); 1373 (void) ftpd_pclose(fin); 1374 dologout(1); 1375 /* NOTREACHED */ 1376 } 1377 if (ferror(fin)) { 1378 perror_reply(551, filename); 1379 (void) ftpd_pclose(fin); 1380 return; 1381 } 1382 (void) putc('\r', stdout); 1383 total_bytes++; 1384 total_bytes_out++; 1385 } 1386 (void) putc(c, stdout); 1387 total_bytes++; 1388 total_bytes_out++; 1389 } 1390 (void) ftpd_pclose(fin); 1391 reply(211, "End of Status"); 1392 } 1393 1394 void 1395 statcmd() 1396 { 1397 struct sockaddr_in *sin; 1398 u_char *a, *p; 1399 off_t b, otbi, otbo, otb; 1400 1401 lreply(211, "%s FTP server status:", hostname); 1402 lreply(0, "%s", version); 1403 if (isdigit(remotehost[0])) 1404 lreply(0, "Connected to %s", remotehost); 1405 else 1406 lreply(0, "Connected to %s (%s)", remotehost, 1407 inet_ntoa(his_addr.sin_addr)); 1408 if (logged_in) { 1409 if (guest) 1410 lreply(0, "Logged in anonymously"); 1411 else 1412 lreply(0, "Logged in as %s", pw->pw_name); 1413 } else if (askpasswd) 1414 lreply(0, "Waiting for password"); 1415 else 1416 lreply(0, "Waiting for user name"); 1417 b = printf(" TYPE: %s", typenames[type]); 1418 total_bytes += b; 1419 total_bytes_out += b; 1420 if (type == TYPE_A || type == TYPE_E) { 1421 b = printf(", FORM: %s", formnames[form]); 1422 total_bytes += b; 1423 total_bytes_out += b; 1424 } 1425 if (type == TYPE_L) { 1426 #if NBBY == 8 1427 b = printf(" %d", NBBY); 1428 #else 1429 /* XXX: `bytesize' needs to be defined in this case */ 1430 b = printf(" %d", bytesize); 1431 #endif 1432 total_bytes += b; 1433 total_bytes_out += b; 1434 } 1435 b = printf("; STRUcture: %s; transfer MODE: %s\r\n", 1436 strunames[stru], modenames[mode]); 1437 total_bytes += b; 1438 total_bytes_out += b; 1439 if (data != -1) 1440 lreply(0, "Data connection open"); 1441 else if (pdata != -1) { 1442 b = printf(" in Passive mode"); 1443 total_bytes += b; 1444 total_bytes_out += b; 1445 sin = &pasv_addr; 1446 goto printaddr; 1447 } else if (usedefault == 0) { 1448 b = printf(" PORT"); 1449 total_bytes += b; 1450 total_bytes_out += b; 1451 sin = &data_dest; 1452 printaddr: 1453 a = (u_char *) &sin->sin_addr; 1454 p = (u_char *) &sin->sin_port; 1455 #define UC(b) (((int) b) & 0xff) 1456 b = printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1457 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1458 #undef UC 1459 total_bytes += b; 1460 total_bytes_out += b; 1461 } else 1462 lreply(0, "No data connection"); 1463 1464 if (logged_in) { 1465 lreply(0, "Data sent: %qd byte%s in %qd file%s", 1466 total_data_out, PLURAL(total_data_out), 1467 total_files_out, PLURAL(total_files_out)); 1468 lreply(0, "Data received: %qd byte%s in %qd file%s", 1469 total_data_in, PLURAL(total_data_in), 1470 total_files_in, PLURAL(total_files_in)); 1471 lreply(0, "Total data: %qd byte%s in %qd file%s", 1472 total_data, PLURAL(total_data), 1473 total_files, PLURAL(total_files)); 1474 } 1475 otbi = total_bytes_in; 1476 otbo = total_bytes_out; 1477 otb = total_bytes; 1478 lreply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1479 otbo, PLURAL(otbo), total_xfers_out, PLURAL(total_xfers_out)); 1480 lreply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1481 otbi, PLURAL(otbi), total_xfers_in, PLURAL(total_xfers_in)); 1482 lreply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1483 otb, PLURAL(otb), total_xfers, PLURAL(total_xfers)); 1484 1485 if (logged_in) { 1486 struct ftpconv *cp; 1487 1488 lreply(0, ""); 1489 lreply(0, "Class: %s", curclass.classname); 1490 lreply(0, "Check PORT commands: %sabled", 1491 curclass.checkportcmd ? "en" : "dis"); 1492 if (curclass.display) 1493 lreply(0, "Display file: %s", curclass.display); 1494 if (curclass.notify) 1495 lreply(0, "Notify fileglob: %s", curclass.notify); 1496 lreply(0, "Idle timeout: %d, maximum timeout: %d", 1497 curclass.timeout, curclass.maxtimeout); 1498 lreply(0, "DELE, MKD, RMD, UMASK, CHMOD commands: %sabled", 1499 curclass.modify ? "en" : "dis"); 1500 lreply(0, "Umask: %.04o", curclass.umask); 1501 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1502 if (cp->suffix == NULL || cp->types == NULL || 1503 cp->command == NULL) 1504 continue; 1505 lreply(0, 1506 "Conversion: %s [%s] disable: %s, command: %s", 1507 cp->suffix, cp->types, cp->disable, cp->command); 1508 } 1509 } 1510 1511 reply(211, "End of status"); 1512 } 1513 1514 void 1515 fatal(s) 1516 const char *s; 1517 { 1518 1519 reply(451, "Error in server: %s\n", s); 1520 reply(221, "Closing connection due to server error."); 1521 dologout(0); 1522 /* NOTREACHED */ 1523 } 1524 1525 void 1526 #ifdef __STDC__ 1527 reply(int n, const char *fmt, ...) 1528 #else 1529 reply(n, fmt, va_alist) 1530 int n; 1531 char *fmt; 1532 va_dcl 1533 #endif 1534 { 1535 off_t b; 1536 va_list ap; 1537 #ifdef __STDC__ 1538 va_start(ap, fmt); 1539 #else 1540 va_start(ap); 1541 #endif 1542 b = 0; 1543 b += printf("%d ", n); 1544 b += vprintf(fmt, ap); 1545 b += printf("\r\n"); 1546 total_bytes += b; 1547 total_bytes_out += b; 1548 (void)fflush(stdout); 1549 if (debug) { 1550 syslog(LOG_DEBUG, "<--- %d ", n); 1551 vsyslog(LOG_DEBUG, fmt, ap); 1552 } 1553 } 1554 1555 void 1556 #ifdef __STDC__ 1557 lreply(int n, const char *fmt, ...) 1558 #else 1559 lreply(n, fmt, va_alist) 1560 int n; 1561 char *fmt; 1562 va_dcl 1563 #endif 1564 { 1565 off_t b; 1566 va_list ap; 1567 #ifdef __STDC__ 1568 va_start(ap, fmt); 1569 #else 1570 va_start(ap); 1571 #endif 1572 b = 0; 1573 switch (n) { 1574 case 0: 1575 b += printf(" "); 1576 case -1: 1577 break; 1578 default: 1579 b += printf("%d-", n); 1580 break; 1581 } 1582 b += vprintf(fmt, ap); 1583 b += printf("\r\n"); 1584 total_bytes += b; 1585 total_bytes_out += b; 1586 (void)fflush(stdout); 1587 if (debug) { 1588 syslog(LOG_DEBUG, "<--- %d- ", n); 1589 vsyslog(LOG_DEBUG, fmt, ap); 1590 } 1591 } 1592 1593 static void 1594 ack(s) 1595 const char *s; 1596 { 1597 1598 reply(250, "%s command successful.", s); 1599 } 1600 1601 void 1602 delete(name) 1603 const char *name; 1604 { 1605 char *p = NULL; 1606 1607 if (remove(name) < 0) { 1608 p = strerror(errno); 1609 perror_reply(550, name); 1610 } else 1611 ack("DELE"); 1612 logcmd("delete", -1, name, NULL, NULL, p); 1613 } 1614 1615 void 1616 cwd(path) 1617 const char *path; 1618 { 1619 1620 if (chdir(path) < 0) 1621 perror_reply(550, path); 1622 else { 1623 show_chdir_messages(250); 1624 ack("CWD"); 1625 } 1626 } 1627 1628 static void 1629 replydirname(name, message) 1630 const char *name, *message; 1631 { 1632 char npath[MAXPATHLEN + 1]; 1633 int i; 1634 1635 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 1636 npath[i] = *name; 1637 if (*name == '"') 1638 npath[++i] = '"'; 1639 } 1640 npath[i] = '\0'; 1641 reply(257, "\"%s\" %s", npath, message); 1642 } 1643 1644 void 1645 makedir(name) 1646 const char *name; 1647 { 1648 char *p = NULL; 1649 1650 if (mkdir(name, 0777) < 0) { 1651 p = strerror(errno); 1652 perror_reply(550, name); 1653 } else 1654 replydirname(name, "directory created."); 1655 logcmd("mkdir", -1, name, NULL, NULL, p); 1656 } 1657 1658 void 1659 removedir(name) 1660 const char *name; 1661 { 1662 char *p = NULL; 1663 1664 if (rmdir(name) < 0) { 1665 p = strerror(errno); 1666 perror_reply(550, name); 1667 } else 1668 ack("RMD"); 1669 logcmd("rmdir", -1, name, NULL, NULL, p); 1670 } 1671 1672 void 1673 pwd() 1674 { 1675 char path[MAXPATHLEN + 1]; 1676 1677 if (getcwd(path, sizeof(path) - 1) == NULL) 1678 reply(550, "Can't get the current directory: %s.", 1679 strerror(errno)); 1680 else 1681 replydirname(path, "is the current directory."); 1682 } 1683 1684 char * 1685 renamefrom(name) 1686 char *name; 1687 { 1688 struct stat st; 1689 1690 if (stat(name, &st) < 0) { 1691 perror_reply(550, name); 1692 return (NULL); 1693 } 1694 reply(350, "File exists, ready for destination name"); 1695 return (name); 1696 } 1697 1698 void 1699 renamecmd(from, to) 1700 const char *from, *to; 1701 { 1702 char *p = NULL; 1703 1704 if (rename(from, to) < 0) { 1705 p = strerror(errno); 1706 perror_reply(550, "rename"); 1707 } else 1708 ack("RNTO"); 1709 logcmd("rename", -1, from, to, NULL, p); 1710 } 1711 1712 static void 1713 dolog(sin) 1714 struct sockaddr_in *sin; 1715 { 1716 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1717 sizeof(struct in_addr), AF_INET); 1718 1719 if (hp) 1720 (void)strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1721 else 1722 (void)strncpy(remotehost, inet_ntoa(sin->sin_addr), 1723 sizeof(remotehost)); 1724 remotehost[sizeof(remotehost) - 1] = '\0'; 1725 #ifdef HASSETPROCTITLE 1726 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1727 setproctitle(proctitle); 1728 #endif /* HASSETPROCTITLE */ 1729 1730 if (logging) 1731 syslog(LOG_INFO, "connection from %s", remotehost); 1732 } 1733 1734 /* 1735 * Record logout in wtmp file 1736 * and exit with supplied status. 1737 */ 1738 void 1739 dologout(status) 1740 int status; 1741 { 1742 /* 1743 * Prevent reception of SIGURG from resulting in a resumption 1744 * back to the main program loop. 1745 */ 1746 transflag = 0; 1747 1748 if (logged_in) { 1749 (void) seteuid((uid_t)0); 1750 logwtmp(ttyline, "", ""); 1751 #ifdef KERBEROS 1752 if (!notickets && krbtkfile_env) 1753 unlink(krbtkfile_env); 1754 #endif 1755 } 1756 /* beware of flushing buffers after a SIGPIPE */ 1757 _exit(status); 1758 } 1759 1760 static void 1761 myoob(signo) 1762 int signo; 1763 { 1764 char *cp; 1765 1766 /* only process if transfer occurring */ 1767 if (!transflag) 1768 return; 1769 cp = tmpline; 1770 if (getline(cp, 7, stdin) == NULL) { 1771 reply(221, "You could at least say goodbye."); 1772 dologout(0); 1773 } 1774 if (strcasecmp(cp, "ABOR\r\n") == 0) { 1775 tmpline[0] = '\0'; 1776 reply(426, "Transfer aborted. Data connection closed."); 1777 reply(226, "Abort successful"); 1778 longjmp(urgcatch, 1); 1779 } 1780 if (strcasecmp(cp, "STAT\r\n") == 0) { 1781 if (file_size != (off_t) -1) 1782 reply(213, "Status: %qd of %qd byte%s transferred", 1783 byte_count, PLURAL(byte_count), file_size); 1784 else 1785 reply(213, "Status: %qd byte%s transferred", 1786 byte_count, PLURAL(byte_count)); 1787 } 1788 } 1789 1790 /* 1791 * Note: a response of 425 is not mentioned as a possible response to 1792 * the PASV command in RFC959. However, it has been blessed as 1793 * a legitimate response by Jon Postel in a telephone conversation 1794 * with Rick Adams on 25 Jan 89. 1795 */ 1796 void 1797 passive() 1798 { 1799 int len; 1800 char *p, *a; 1801 1802 pdata = socket(AF_INET, SOCK_STREAM, 0); 1803 if (pdata < 0 || !logged_in) { 1804 perror_reply(425, "Can't open passive connection"); 1805 return; 1806 } 1807 pasv_addr = ctrl_addr; 1808 pasv_addr.sin_port = 0; 1809 (void) seteuid((uid_t)0); 1810 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1811 (void) seteuid((uid_t)pw->pw_uid); 1812 goto pasv_error; 1813 } 1814 (void) seteuid((uid_t)pw->pw_uid); 1815 len = sizeof(pasv_addr); 1816 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1817 goto pasv_error; 1818 if (listen(pdata, 1) < 0) 1819 goto pasv_error; 1820 a = (char *) &pasv_addr.sin_addr; 1821 p = (char *) &pasv_addr.sin_port; 1822 1823 #define UC(b) (((int) b) & 0xff) 1824 1825 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1826 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1827 return; 1828 1829 pasv_error: 1830 (void) close(pdata); 1831 pdata = -1; 1832 perror_reply(425, "Can't open passive connection"); 1833 return; 1834 } 1835 1836 /* 1837 * Generate unique name for file with basename "local". 1838 * The file named "local" is already known to exist. 1839 * Generates failure reply on error. 1840 * 1841 * XXX this function should under go changes similar to 1842 * the mktemp(3)/mkstemp(3) changes. 1843 */ 1844 static char * 1845 gunique(local) 1846 const char *local; 1847 { 1848 static char new[MAXPATHLEN + 1]; 1849 struct stat st; 1850 int count, len; 1851 char *cp; 1852 1853 cp = strrchr(local, '/'); 1854 if (cp) 1855 *cp = '\0'; 1856 if (stat(cp ? local : ".", &st) < 0) { 1857 perror_reply(553, cp ? local : "."); 1858 return (NULL); 1859 } 1860 if (cp) 1861 *cp = '/'; 1862 (void) strcpy(new, local); 1863 len = strlen(new); 1864 cp = new + len; 1865 *cp++ = '.'; 1866 for (count = 1; count < 100; count++) { 1867 (void)snprintf(cp, sizeof(new) - len - 2, "%d", count); 1868 if (stat(new, &st) < 0) 1869 return (new); 1870 } 1871 reply(452, "Unique file name cannot be created."); 1872 return (NULL); 1873 } 1874 1875 /* 1876 * Format and send reply containing system error number. 1877 */ 1878 void 1879 perror_reply(code, string) 1880 int code; 1881 const char *string; 1882 { 1883 int save_errno; 1884 1885 save_errno = errno; 1886 reply(code, "%s: %s.", string, strerror(errno)); 1887 errno = save_errno; 1888 } 1889 1890 static char *onefile[] = { 1891 "", 1892 0 1893 }; 1894 1895 void 1896 send_file_list(whichf) 1897 const char *whichf; 1898 { 1899 struct stat st; 1900 DIR *dirp = NULL; 1901 struct dirent *dir; 1902 FILE *dout = NULL; 1903 char **dirlist, *dirname, *p; 1904 int simple = 0; 1905 int freeglob = 0; 1906 glob_t gl; 1907 off_t b; 1908 1909 #ifdef __GNUC__ 1910 (void) &dout; 1911 (void) &dirlist; 1912 (void) &simple; 1913 (void) &freeglob; 1914 #endif 1915 1916 p = NULL; 1917 if (strpbrk(whichf, "~{[*?") != NULL) { 1918 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 1919 1920 memset(&gl, 0, sizeof(gl)); 1921 freeglob = 1; 1922 if (glob(whichf, flags, 0, &gl)) { 1923 reply(550, "not found"); 1924 goto out; 1925 } else if (gl.gl_pathc == 0) { 1926 errno = ENOENT; 1927 perror_reply(550, whichf); 1928 goto out; 1929 } 1930 dirlist = gl.gl_pathv; 1931 } else { 1932 p = xstrdup(whichf); 1933 onefile[0] = p; 1934 dirlist = onefile; 1935 simple = 1; 1936 } 1937 /* XXX: } for vi sm */ 1938 1939 if (setjmp(urgcatch)) { 1940 transflag = 0; 1941 goto out; 1942 } 1943 while ((dirname = *dirlist++) != NULL) { 1944 int trailingslash = 0; 1945 1946 if (stat(dirname, &st) < 0) { 1947 /* 1948 * If user typed "ls -l", etc, and the client 1949 * used NLST, do what the user meant. 1950 */ 1951 if (dirname[0] == '-' && *dirlist == NULL && 1952 transflag == 0) { 1953 retrieve("/bin/ls %s", dirname); 1954 goto out; 1955 } 1956 perror_reply(550, whichf); 1957 if (dout != NULL) { 1958 (void) fclose(dout); 1959 transflag = 0; 1960 data = -1; 1961 pdata = -1; 1962 } 1963 goto out; 1964 } 1965 1966 if (S_ISREG(st.st_mode)) { 1967 if (dout == NULL) { 1968 dout = dataconn("file list", (off_t)-1, "w"); 1969 if (dout == NULL) 1970 goto out; 1971 transflag++; 1972 } 1973 b = fprintf(dout, "%s%s\n", dirname, 1974 type == TYPE_A ? "\r" : ""); 1975 total_bytes += b; 1976 total_bytes_out += b; 1977 byte_count += strlen(dirname) + 1; 1978 continue; 1979 } else if (!S_ISDIR(st.st_mode)) 1980 continue; 1981 1982 if (dirname[strlen(dirname) - 1] == '/') 1983 trailingslash++; 1984 1985 if ((dirp = opendir(dirname)) == NULL) 1986 continue; 1987 1988 while ((dir = readdir(dirp)) != NULL) { 1989 char nbuf[MAXPATHLEN + 1]; 1990 1991 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1992 continue; 1993 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1994 dir->d_namlen == 2) 1995 continue; 1996 1997 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 1998 trailingslash ? "" : "/", dir->d_name); 1999 2000 /* 2001 * We have to do a stat to ensure it's 2002 * not a directory or special file. 2003 */ 2004 if (simple || (stat(nbuf, &st) == 0 && 2005 S_ISREG(st.st_mode))) { 2006 char *p; 2007 2008 if (dout == NULL) { 2009 dout = dataconn("file list", (off_t)-1, 2010 "w"); 2011 if (dout == NULL) 2012 goto out; 2013 transflag++; 2014 } 2015 p = nbuf; 2016 if (nbuf[0] == '.' && nbuf[1] == '/') 2017 p = &nbuf[2]; 2018 b = fprintf(dout, "%s%s\n", p, 2019 type == TYPE_A ? "\r" : ""); 2020 total_bytes += b; 2021 total_bytes_out += b; 2022 byte_count += strlen(nbuf) + 1; 2023 } 2024 } 2025 (void) closedir(dirp); 2026 } 2027 2028 if (dout == NULL) 2029 reply(550, "No files found."); 2030 else if (ferror(dout) != 0) 2031 perror_reply(550, "Data connection"); 2032 else 2033 reply(226, "Transfer complete."); 2034 2035 transflag = 0; 2036 if (dout != NULL) 2037 (void) fclose(dout); 2038 data = -1; 2039 pdata = -1; 2040 out: 2041 total_xfers++; 2042 total_xfers_out++; 2043 if (p) 2044 free(p); 2045 if (freeglob) 2046 globfree(&gl); 2047 } 2048 2049 char * 2050 conffilename(s) 2051 const char *s; 2052 { 2053 static char filename[MAXPATHLEN + 1]; 2054 2055 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2056 return filename; 2057 } 2058 2059 /* 2060 * logcmd -- 2061 * based on the arguments, syslog a message: 2062 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2063 * else if file2 != NULL "<command> <file1> <file2>" 2064 * else "<command> <file1>" 2065 * if elapsed != NULL, append "in xxx.yyy seconds" 2066 * if error != NULL, append ": " + error 2067 */ 2068 2069 void 2070 logcmd(command, bytes, file1, file2, elapsed, error) 2071 const char *command; 2072 off_t bytes; 2073 const char *file1; 2074 const char *file2; 2075 const struct timeval *elapsed; 2076 const char *error; 2077 { 2078 char buf[MAXPATHLEN + 100], realfile[MAXPATHLEN + 1]; 2079 const char *p; 2080 size_t len; 2081 2082 if (logging <=1) 2083 return; 2084 2085 if ((p = realpath(file1, realfile)) == NULL) { 2086 #if 0 /* XXX: too noisy */ 2087 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2088 realfile, strerror(errno)); 2089 #endif 2090 p = file1; 2091 } 2092 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2093 2094 if (bytes != (off_t)-1) { 2095 len += snprintf(buf + len, sizeof(buf) - len, 2096 " = %qd byte%s", (long long) bytes, PLURAL(bytes)); 2097 } else if (file2 != NULL) { 2098 if ((p = realpath(file2, realfile)) == NULL) { 2099 #if 0 /* XXX: too noisy */ 2100 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2101 realfile, strerror(errno)); 2102 #endif 2103 p = file2; 2104 } 2105 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2106 } 2107 2108 if (elapsed != NULL) { 2109 len += snprintf(buf + len, sizeof(buf) - len, 2110 " in %ld.%.03d seconds", elapsed->tv_sec, 2111 (int)(elapsed->tv_usec / 1000)); 2112 } 2113 2114 if (error != NULL) 2115 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2116 2117 syslog(LOG_INFO, "%s", buf); 2118 } 2119 2120 char * 2121 xstrdup(s) 2122 const char *s; 2123 { 2124 char *new = strdup(s); 2125 2126 if (new == NULL) 2127 fatal("Local resource failure: malloc"); 2128 /* NOTREACHED */ 2129 return (new); 2130 } 2131
Indexes created Tue Sep 23 14:10:03 GMT 2025