ftpd.c revision 1.66
1 /* $NetBSD: ftpd.c,v 1.66 1999/06/05 13:49:53 briggs 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 1.66 1999/06/05 13:49:53 briggs 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, keepalive; 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 /* Set keepalives on the socket to detect dropped connections. */ 332 #ifdef SO_KEEPALIVE 333 keepalive = 1; 334 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 335 sizeof(int)) < 0) 336 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 337 #endif 338 339 #ifdef F_SETOWN 340 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 341 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 342 #endif 343 dolog(&his_addr); 344 /* 345 * Set up default state 346 */ 347 data = -1; 348 type = TYPE_A; 349 form = FORM_N; 350 stru = STRU_F; 351 mode = MODE_S; 352 tmpline[0] = '\0'; 353 hasyyerrored = 0; 354 355 #ifdef KERBEROS5 356 kerror = krb5_init_context(&kcontext); 357 if (kerror) { 358 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 359 error_message(kerror)); 360 exit(0); 361 } 362 #endif /* KERBEROS5 */ 363 364 /* If logins are disabled, print out the message. */ 365 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 366 lreply(530, ""); 367 while (fgets(line, sizeof(line), fd) != NULL) { 368 if ((cp = strchr(line, '\n')) != NULL) 369 *cp = '\0'; 370 lreply(0, "%s", line); 371 } 372 (void) fflush(stdout); 373 (void) fclose(fd); 374 reply(530, "System not available."); 375 exit(0); 376 } 377 if ((fd = fopen(conffilename(_PATH_FTPWELCOME), "r")) != NULL) { 378 lreply(220, ""); 379 while (fgets(line, sizeof(line), fd) != NULL) { 380 if ((cp = strchr(line, '\n')) != NULL) 381 *cp = '\0'; 382 lreply(0, "%s", line); 383 } 384 (void) fflush(stdout); 385 (void) fclose(fd); 386 /* reply(220,) must follow */ 387 } 388 (void)gethostname(hostname, sizeof(hostname)); 389 hostname[sizeof(hostname) - 1] = '\0'; 390 reply(220, "%s FTP server (%s) ready.", hostname, version); 391 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 392 (void) setjmp(errcatch); 393 for (;;) 394 (void) yyparse(); 395 /* NOTREACHED */ 396 } 397 398 static void 399 lostconn(signo) 400 int signo; 401 { 402 403 if (debug) 404 syslog(LOG_DEBUG, "lost connection"); 405 dologout(1); 406 } 407 408 /* 409 * Save the result of a getpwnam. Used for USER command, since 410 * the data returned must not be clobbered by any other command 411 * (e.g., globbing). 412 */ 413 static struct passwd * 414 sgetpwnam(name) 415 const char *name; 416 { 417 static struct passwd save; 418 struct passwd *p; 419 420 if ((p = getpwnam(name)) == NULL) 421 return (p); 422 if (save.pw_name) { 423 free((char *)save.pw_name); 424 free((char *)save.pw_passwd); 425 free((char *)save.pw_gecos); 426 free((char *)save.pw_dir); 427 free((char *)save.pw_shell); 428 } 429 save = *p; 430 save.pw_name = xstrdup(p->pw_name); 431 save.pw_passwd = xstrdup(p->pw_passwd); 432 save.pw_gecos = xstrdup(p->pw_gecos); 433 save.pw_dir = xstrdup(p->pw_dir); 434 save.pw_shell = xstrdup(p->pw_shell); 435 return (&save); 436 } 437 438 static int login_attempts; /* number of failed login attempts */ 439 static int askpasswd; /* had user command, ask for passwd */ 440 static char curname[10]; /* current USER name */ 441 442 /* 443 * USER command. 444 * Sets global passwd pointer pw if named account exists and is acceptable; 445 * sets askpasswd if a PASS command is expected. If logged in previously, 446 * need to reset state. If name is "ftp" or "anonymous", the name is not in 447 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 448 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 449 * requesting login privileges. Disallow anyone who does not have a standard 450 * shell as returned by getusershell(). Disallow anyone mentioned in the file 451 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 452 */ 453 void 454 user(name) 455 const char *name; 456 { 457 if (logged_in) { 458 if (guest) { 459 reply(530, "Can't change user from guest login."); 460 return; 461 } else if (dochroot) { 462 reply(530, "Can't change user from chroot user."); 463 return; 464 } 465 end_login(); 466 } 467 468 #if defined(KERBEROS) || defined(KERBEROS5) 469 kdestroy(); 470 #endif 471 472 guest = 0; 473 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 474 if (checkaccess("ftp") || checkaccess("anonymous")) 475 reply(530, "User %s access denied.", name); 476 else if ((pw = sgetpwnam("ftp")) != NULL) { 477 guest = 1; 478 askpasswd = 1; 479 reply(331, 480 "Guest login ok, type your name as password."); 481 } else 482 reply(530, "User %s unknown.", name); 483 if (!askpasswd && logging) 484 syslog(LOG_NOTICE, 485 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 486 return; 487 } 488 489 pw = sgetpwnam(name); 490 if (logging) 491 strncpy(curname, name, sizeof(curname)-1); 492 493 #ifdef SKEY 494 if (skey_haskey(name) == 0) { 495 char *myskey; 496 497 myskey = skey_keyinfo(name); 498 reply(331, "Password [%s] required for %s.", 499 myskey ? myskey : "error getting challenge", name); 500 } else 501 #endif 502 reply(331, "Password required for %s.", name); 503 504 askpasswd = 1; 505 /* 506 * Delay before reading passwd after first failed 507 * attempt to slow down passwd-guessing programs. 508 */ 509 if (login_attempts) 510 sleep((unsigned) login_attempts); 511 } 512 513 /* 514 * Determine whether something is to happen (allow access, chroot) 515 * for a user. Each line is a shell-style glob followed by 516 * `yes' or `no'. 517 * 518 * For backward compatability, `allow' and `deny' are synonymns 519 * for `yes' and `no', respectively. 520 * 521 * Each glob is matched against the username in turn, and the first 522 * match found is used. If no match is found, the result is the 523 * argument `def'. If a match is found but without and explicit 524 * `yes'/`no', the result is the opposite of def. 525 * 526 * If the file doesn't exist at all, the result is the argument 527 * `nofile' 528 * 529 * Any line starting with `#' is considered a comment and ignored. 530 * 531 * Returns FALSE if the user is denied, or TRUE if they are allowed. 532 */ 533 int 534 checkuser(fname, name, def, nofile) 535 const char *fname, *name; 536 int def, nofile; 537 { 538 FILE *fd; 539 int retval; 540 char *glob, *perm, line[BUFSIZ]; 541 542 retval = def; 543 if ((fd = fopen(conffilename(fname), "r")) == NULL) 544 return nofile; 545 546 while (fgets(line, sizeof(line), fd) != NULL) { 547 glob = strtok(line, " \t\n"); 548 if (glob[0] == '#') 549 continue; 550 perm = strtok(NULL, " \t\n"); 551 if (fnmatch(glob, name, 0) == 0) { 552 if (perm != NULL && 553 ((strcasecmp(perm, "allow") == 0) || 554 (strcasecmp(perm, "yes") == 0))) 555 retval = TRUE; 556 else if (perm != NULL && 557 ((strcasecmp(perm, "deny") == 0) || 558 (strcasecmp(perm, "no") == 0))) 559 retval = FALSE; 560 else 561 retval = !def; 562 break; 563 } 564 } 565 (void) fclose(fd); 566 return (retval); 567 } 568 569 /* 570 * Check if user is allowed by /etc/ftpusers 571 * returns 0 for yes, 1 for no 572 */ 573 int 574 checkaccess(name) 575 const char *name; 576 { 577 578 return (! checkuser(_PATH_FTPUSERS, name, TRUE, FALSE)); 579 } 580 581 /* 582 * Terminate login as previous user, if any, resetting state; 583 * used when USER command is given or login fails. 584 */ 585 static void 586 end_login() 587 { 588 589 (void) seteuid((uid_t)0); 590 if (logged_in) 591 logwtmp(ttyline, "", ""); 592 pw = NULL; 593 logged_in = 0; 594 guest = 0; 595 dochroot = 0; 596 } 597 598 void 599 pass(passwd) 600 const char *passwd; 601 { 602 int rval; 603 FILE *fd; 604 char const *cp, *shell, *home; 605 606 if (logged_in || askpasswd == 0) { 607 reply(503, "Login with USER first."); 608 return; 609 } 610 askpasswd = 0; 611 if (!guest) { /* "ftp" is only account allowed no password */ 612 if (pw == NULL) { 613 rval = 1; /* failure below */ 614 goto skip; 615 } 616 #ifdef KERBEROS 617 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 618 rval = 0; 619 goto skip; 620 } 621 #endif 622 #ifdef KERBEROS5 623 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 624 rval = 0; 625 goto skip; 626 } 627 #endif 628 #ifdef SKEY 629 if (skey_haskey(pw->pw_name) == 0) { 630 char *p; 631 int r; 632 633 p = xstrdup(passwd); 634 r = skey_passcheck(pw->pw_name, p); 635 free(p); 636 if (r != -1) { 637 rval = 0; 638 goto skip; 639 } 640 } 641 #endif 642 if (!sflag && *pw->pw_passwd != '\0' && 643 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 644 rval = 0; 645 goto skip; 646 } 647 rval = 1; 648 649 skip: 650 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 651 rval = 2; 652 /* 653 * If rval > 0, the user failed the authentication check 654 * above. If rval == 0, either Kerberos or local authentication 655 * succeeded. 656 */ 657 if (rval) { 658 reply(530, rval == 2 ? "Password expired." : 659 "Login incorrect."); 660 if (logging) { 661 syslog(LOG_NOTICE, 662 "FTP LOGIN FAILED FROM %s", remotehost); 663 syslog(LOG_AUTHPRIV | LOG_NOTICE, 664 "FTP LOGIN FAILED FROM %s, %s", 665 remotehost, curname); 666 } 667 pw = NULL; 668 if (login_attempts++ >= 5) { 669 syslog(LOG_NOTICE, 670 "repeated login failures from %s", 671 remotehost); 672 exit(0); 673 } 674 return; 675 } 676 } 677 678 /* password was ok; see if anything else prevents login */ 679 if (checkaccess(pw->pw_name)) { 680 reply(530, "User %s may not use FTP.", pw->pw_name); 681 if (logging) 682 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 683 remotehost, pw->pw_name); 684 pw = (struct passwd *) NULL; 685 return; 686 } 687 /* check for valid shell, if not guest user */ 688 if ((shell = pw->pw_shell) == NULL || *shell == 0) 689 shell = _PATH_BSHELL; 690 while ((cp = getusershell()) != NULL) 691 if (strcmp(cp, shell) == 0) 692 break; 693 endusershell(); 694 if (cp == NULL && guest == 0) { 695 reply(530, "User %s may not use FTP.", pw->pw_name); 696 if (logging) 697 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 698 remotehost, pw->pw_name); 699 pw = (struct passwd *) NULL; 700 return; 701 } 702 703 login_attempts = 0; /* this time successful */ 704 if (setegid((gid_t)pw->pw_gid) < 0) { 705 reply(550, "Can't set gid."); 706 return; 707 } 708 (void) initgroups(pw->pw_name, pw->pw_gid); 709 710 /* open wtmp before chroot */ 711 logwtmp(ttyline, pw->pw_name, remotehost); 712 logged_in = 1; 713 714 dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name, FALSE, FALSE); 715 716 /* parse ftpd.conf, setting up various parameters */ 717 if (guest) 718 parse_conf(CLASS_GUEST); 719 else if (dochroot) 720 parse_conf(CLASS_CHROOT); 721 else 722 parse_conf(CLASS_REAL); 723 724 home = "/"; 725 if (guest) { 726 /* 727 * We MUST do a chdir() after the chroot. Otherwise 728 * the old current directory will be accessible as "." 729 * outside the new root! 730 */ 731 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 732 chdir("/") < 0) { 733 reply(550, "Can't set guest privileges."); 734 goto bad; 735 } 736 } else if (dochroot) { 737 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 738 reply(550, "Can't change root."); 739 goto bad; 740 } 741 } else if (chdir(pw->pw_dir) < 0) { 742 if (chdir("/") < 0) { 743 reply(530, "User %s: can't change directory to %s.", 744 pw->pw_name, pw->pw_dir); 745 goto bad; 746 } else 747 lreply(230, "No directory! Logging in with home=/"); 748 } else 749 home = pw->pw_dir; 750 if (seteuid((uid_t)pw->pw_uid) < 0) { 751 reply(550, "Can't set uid."); 752 goto bad; 753 } 754 setenv("HOME", home, 1); 755 756 757 /* 758 * Display a login message, if it exists. 759 * N.B. reply(230,) must follow the message. 760 */ 761 if ((fd = fopen(conffilename(_PATH_FTPLOGINMESG), "r")) != NULL) { 762 char *cp, line[LINE_MAX]; 763 764 lreply(230, ""); 765 while (fgets(line, sizeof(line), fd) != NULL) { 766 if ((cp = strchr(line, '\n')) != NULL) 767 *cp = '\0'; 768 lreply(0, "%s", line); 769 } 770 (void) fflush(stdout); 771 (void) fclose(fd); 772 } 773 show_chdir_messages(230); 774 if (guest) { 775 reply(230, "Guest login ok, access restrictions apply."); 776 #ifdef HASSETPROCTITLE 777 snprintf(proctitle, sizeof(proctitle), 778 "%s: anonymous/%.*s", remotehost, 779 (int) (sizeof(proctitle) - sizeof(remotehost) - 780 sizeof(": anonymous/")), passwd); 781 setproctitle(proctitle); 782 #endif /* HASSETPROCTITLE */ 783 if (logging) 784 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 785 remotehost, passwd); 786 } else { 787 reply(230, "User %s logged in.", pw->pw_name); 788 #ifdef HASSETPROCTITLE 789 snprintf(proctitle, sizeof(proctitle), 790 "%s: %s", remotehost, pw->pw_name); 791 setproctitle(proctitle); 792 #endif /* HASSETPROCTITLE */ 793 if (logging) 794 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 795 remotehost, pw->pw_name); 796 } 797 (void) umask(curclass.umask); 798 return; 799 bad: 800 /* Forget all about it... */ 801 end_login(); 802 } 803 804 void 805 retrieve(cmd, name) 806 const char *cmd, *name; 807 { 808 FILE *fin = NULL, *dout; 809 struct stat st; 810 int (*closefunc) __P((FILE *)) = NULL; 811 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 812 struct timeval start, finish, td, *tdp; 813 char tline[BUFSIZ]; 814 const char *dispname; 815 816 sendrv = closerv = stderrfd = -1; 817 isconversion = isdata = isls = log = 0; 818 tdp = NULL; 819 dispname = name; 820 if (cmd == NULL) { 821 log = 1; 822 isdata = 1; 823 fin = fopen(name, "r"); 824 closefunc = fclose; 825 if (fin == NULL) 826 cmd = do_conversion(name); 827 if (cmd != NULL) { 828 isconversion++; 829 syslog(LOG_INFO, "get command: '%s'", cmd); 830 } 831 } 832 if (cmd != NULL) { 833 char temp[MAXPATHLEN + 1]; 834 835 if (strncmp(cmd, INTERNAL_LS, sizeof(INTERNAL_LS) - 1) == 0 && 836 strchr(" \t\n", cmd[sizeof(INTERNAL_LS) - 1]) != NULL) { 837 isls = 1; 838 stderrfd = -1; 839 } else { 840 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 841 stderrfd = mkstemp(temp); 842 if (stderrfd != -1) 843 (void)unlink(temp); 844 } 845 (void)snprintf(tline, sizeof(tline), cmd, name); 846 dispname = tline; 847 fin = ftpd_popen(tline, "r", stderrfd); 848 closefunc = ftpd_pclose; 849 st.st_size = -1; 850 st.st_blksize = BUFSIZ; 851 } 852 if (fin == NULL) { 853 if (errno != 0) { 854 perror_reply(550, dispname); 855 if (log) 856 logcmd("get", -1, name, NULL, NULL, 857 strerror(errno)); 858 } 859 if (stderrfd != -1) 860 (void)close(stderrfd); 861 return; 862 } 863 byte_count = -1; 864 if (cmd == NULL 865 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 866 reply(550, "%s: not a plain file.", dispname); 867 goto done; 868 } 869 if (restart_point) { 870 if (type == TYPE_A) { 871 off_t i; 872 int c; 873 874 for (i = 0; i < restart_point; i++) { 875 if ((c=getc(fin)) == EOF) { 876 perror_reply(550, dispname); 877 goto done; 878 } 879 if (c == '\n') 880 i++; 881 } 882 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 883 perror_reply(550, dispname); 884 goto done; 885 } 886 } 887 dout = dataconn(dispname, st.st_size, "w"); 888 if (dout == NULL) 889 goto done; 890 891 (void)gettimeofday(&start, NULL); 892 sendrv = send_data(fin, dout, st.st_blksize, isdata); 893 (void)gettimeofday(&finish, NULL); 894 (void) fclose(dout); 895 timersub(&finish, &start, &td); 896 tdp = &td; 897 data = -1; 898 pdata = -1; 899 done: 900 if (log) 901 logcmd("get", byte_count, name, NULL, tdp, NULL); 902 closerv = (*closefunc)(fin); 903 if (sendrv == 0) { 904 FILE *err; 905 struct stat sb; 906 907 if (!isls && cmd != NULL && closerv != 0) { 908 lreply(226, 909 "Command returned an exit status of %d", 910 closerv); 911 if (isconversion) 912 syslog(LOG_INFO, 913 "get command: '%s' returned %d", 914 cmd, closerv); 915 } 916 if (!isls && cmd != NULL && stderrfd != -1 && 917 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 918 ((err = fdopen(stderrfd, "r")) != NULL)) { 919 char *cp, line[LINE_MAX]; 920 921 lreply(226, "Command error messages:"); 922 rewind(err); 923 while (fgets(line, sizeof(line), err) != NULL) { 924 if ((cp = strchr(line, '\n')) != NULL) 925 *cp = '\0'; 926 lreply(0, " %s", line); 927 } 928 (void) fflush(stdout); 929 (void) fclose(err); 930 /* a reply(226,) must follow */ 931 } 932 reply(226, "Transfer complete."); 933 } 934 if (stderrfd != -1) 935 (void)close(stderrfd); 936 } 937 938 void 939 store(name, mode, unique) 940 const char *name, *mode; 941 int unique; 942 { 943 FILE *fout, *din; 944 struct stat st; 945 int (*closefunc) __P((FILE *)); 946 struct timeval start, finish, td, *tdp; 947 char *desc; 948 949 desc = (*mode == 'w') ? "put" : "append"; 950 if (unique && stat(name, &st) == 0 && 951 (name = gunique(name)) == NULL) { 952 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 953 return; 954 } 955 956 if (restart_point) 957 mode = "r+"; 958 fout = fopen(name, mode); 959 closefunc = fclose; 960 tdp = NULL; 961 if (fout == NULL) { 962 perror_reply(553, name); 963 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 964 return; 965 } 966 byte_count = -1; 967 if (restart_point) { 968 if (type == TYPE_A) { 969 off_t i; 970 int c; 971 972 for (i = 0; i < restart_point; i++) { 973 if ((c=getc(fout)) == EOF) { 974 perror_reply(550, name); 975 goto done; 976 } 977 if (c == '\n') 978 i++; 979 } 980 /* 981 * We must do this seek to "current" position 982 * because we are changing from reading to 983 * writing. 984 */ 985 if (fseek(fout, 0L, SEEK_CUR) < 0) { 986 perror_reply(550, name); 987 goto done; 988 } 989 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 990 perror_reply(550, name); 991 goto done; 992 } 993 } 994 din = dataconn(name, (off_t)-1, "r"); 995 if (din == NULL) 996 goto done; 997 (void)gettimeofday(&start, NULL); 998 if (receive_data(din, fout) == 0) { 999 if (unique) 1000 reply(226, "Transfer complete (unique file name:%s).", 1001 name); 1002 else 1003 reply(226, "Transfer complete."); 1004 } 1005 (void)gettimeofday(&finish, NULL); 1006 (void) fclose(din); 1007 timersub(&finish, &start, &td); 1008 tdp = &td; 1009 data = -1; 1010 pdata = -1; 1011 done: 1012 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1013 (*closefunc)(fout); 1014 } 1015 1016 static FILE * 1017 getdatasock(mode) 1018 const char *mode; 1019 { 1020 int on = 1, s, t, tries; 1021 1022 if (data >= 0) 1023 return (fdopen(data, mode)); 1024 (void) seteuid((uid_t)0); 1025 s = socket(AF_INET, SOCK_STREAM, 0); 1026 if (s < 0) 1027 goto bad; 1028 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1029 (char *) &on, sizeof(on)) < 0) 1030 goto bad; 1031 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1032 (char *) &on, sizeof(on)) < 0) 1033 goto bad; 1034 /* anchor socket to avoid multi-homing problems */ 1035 data_source.sin_len = sizeof(struct sockaddr_in); 1036 data_source.sin_family = AF_INET; 1037 data_source.sin_addr = ctrl_addr.sin_addr; 1038 for (tries = 1; ; tries++) { 1039 if (bind(s, (struct sockaddr *)&data_source, 1040 sizeof(data_source)) >= 0) 1041 break; 1042 if (errno != EADDRINUSE || tries > 10) 1043 goto bad; 1044 sleep(tries); 1045 } 1046 (void) seteuid((uid_t)pw->pw_uid); 1047 #ifdef IP_TOS 1048 on = IPTOS_THROUGHPUT; 1049 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 1050 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1051 #endif 1052 return (fdopen(s, mode)); 1053 bad: 1054 /* Return the real value of errno (close may change it) */ 1055 t = errno; 1056 (void) seteuid((uid_t)pw->pw_uid); 1057 (void) close(s); 1058 errno = t; 1059 return (NULL); 1060 } 1061 1062 static FILE * 1063 dataconn(name, size, mode) 1064 const char *name; 1065 off_t size; 1066 const char *mode; 1067 { 1068 char sizebuf[32]; 1069 FILE *file; 1070 int retry = 0, tos, keepalive; 1071 1072 file_size = size; 1073 byte_count = 0; 1074 if (size != (off_t) -1) 1075 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1076 (qdfmt_t)size, PLURAL(size)); 1077 else 1078 sizebuf[0] = '\0'; 1079 if (pdata >= 0) { 1080 struct sockaddr_in from; 1081 int s, fromlen = sizeof(from); 1082 1083 (void) alarm(curclass.timeout); 1084 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1085 (void) alarm(0); 1086 if (s < 0) { 1087 reply(425, "Can't open data connection."); 1088 (void) close(pdata); 1089 pdata = -1; 1090 return (NULL); 1091 } 1092 (void) close(pdata); 1093 pdata = s; 1094 #ifdef IP_TOS 1095 tos = IPTOS_THROUGHPUT; 1096 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1097 sizeof(int)); 1098 #endif 1099 /* Set keepalives on the socket to detect dropped conns. */ 1100 #ifdef SO_KEEPALIVE 1101 keepalive = 1; 1102 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1103 (char *)&keepalive, sizeof(int)); 1104 #endif 1105 reply(150, "Opening %s mode data connection for '%s'%s.", 1106 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1107 return (fdopen(pdata, mode)); 1108 } 1109 if (data >= 0) { 1110 reply(125, "Using existing data connection for '%s'%s.", 1111 name, sizebuf); 1112 usedefault = 1; 1113 return (fdopen(data, mode)); 1114 } 1115 if (usedefault) 1116 data_dest = his_addr; 1117 usedefault = 1; 1118 file = getdatasock(mode); 1119 if (file == NULL) { 1120 reply(425, "Can't create data socket (%s,%d): %s.", 1121 inet_ntoa(data_source.sin_addr), 1122 ntohs(data_source.sin_port), strerror(errno)); 1123 return (NULL); 1124 } 1125 data = fileno(file); 1126 while (connect(data, (struct sockaddr *)&data_dest, 1127 sizeof(data_dest)) < 0) { 1128 if (errno == EADDRINUSE && retry < swaitmax) { 1129 sleep((unsigned) swaitint); 1130 retry += swaitint; 1131 continue; 1132 } 1133 perror_reply(425, "Can't build data connection"); 1134 (void) fclose(file); 1135 data = -1; 1136 return (NULL); 1137 } 1138 reply(150, "Opening %s mode data connection for '%s'%s.", 1139 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1140 return (file); 1141 } 1142 1143 /* 1144 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1145 * encapsulation of the data subject * to Mode, Structure, and Type. 1146 * 1147 * NB: Form isn't handled. 1148 */ 1149 static int 1150 send_data(instr, outstr, blksize, isdata) 1151 FILE *instr, *outstr; 1152 off_t blksize; 1153 int isdata; 1154 { 1155 int c, cnt, filefd, netfd, rval; 1156 char *buf; 1157 1158 transflag = 1; 1159 rval = -1; 1160 buf = NULL; 1161 if (setjmp(urgcatch)) 1162 goto cleanup_send_data; 1163 1164 switch (type) { 1165 1166 case TYPE_A: 1167 (void) alarm(curclass.timeout); 1168 while ((c = getc(instr)) != EOF) { 1169 byte_count++; 1170 if (c == '\n') { 1171 if (ferror(outstr)) 1172 goto data_err; 1173 (void) putc('\r', outstr); 1174 if (isdata) { 1175 total_data_out++; 1176 total_data++; 1177 } 1178 total_bytes_out++; 1179 total_bytes++; 1180 } 1181 (void) putc(c, outstr); 1182 if (isdata) { 1183 total_data_out++; 1184 total_data++; 1185 } 1186 total_bytes_out++; 1187 total_bytes++; 1188 if ((byte_count % 4096) == 0) 1189 (void) alarm(curclass.timeout); 1190 } 1191 (void) alarm(0); 1192 fflush(outstr); 1193 if (ferror(instr)) 1194 goto file_err; 1195 if (ferror(outstr)) 1196 goto data_err; 1197 rval = 0; 1198 goto cleanup_send_data; 1199 1200 case TYPE_I: 1201 case TYPE_L: 1202 if ((buf = malloc((size_t)blksize)) == NULL) { 1203 perror_reply(451, "Local resource failure: malloc"); 1204 goto cleanup_send_data; 1205 } 1206 filefd = fileno(instr); 1207 netfd = fileno(outstr); 1208 (void) alarm(curclass.timeout); 1209 while ((cnt = read(filefd, buf, (size_t)blksize)) > 0) { 1210 if (write(netfd, buf, cnt) != cnt) 1211 goto data_err; 1212 (void) alarm(curclass.timeout); 1213 byte_count += cnt; 1214 if (isdata) { 1215 total_data_out += cnt; 1216 total_data += cnt; 1217 } 1218 total_bytes_out += cnt; 1219 total_bytes += cnt; 1220 } 1221 if (cnt < 0) 1222 goto file_err; 1223 rval = 0; 1224 goto cleanup_send_data; 1225 1226 default: 1227 reply(550, "Unimplemented TYPE %d in send_data", type); 1228 goto cleanup_send_data; 1229 } 1230 1231 data_err: 1232 (void) alarm(0); 1233 perror_reply(426, "Data connection"); 1234 goto cleanup_send_data; 1235 1236 file_err: 1237 (void) alarm(0); 1238 perror_reply(551, "Error on input file"); 1239 /* FALLTHROUGH */ 1240 1241 cleanup_send_data: 1242 (void) alarm(0); 1243 transflag = 0; 1244 if (buf) 1245 free(buf); 1246 if (isdata) { 1247 total_files_out++; 1248 total_files++; 1249 } 1250 total_xfers_out++; 1251 total_xfers++; 1252 return (rval); 1253 } 1254 1255 /* 1256 * Transfer data from peer to "outstr" using the appropriate encapulation of 1257 * the data subject to Mode, Structure, and Type. 1258 * 1259 * N.B.: Form isn't handled. 1260 */ 1261 static int 1262 receive_data(instr, outstr) 1263 FILE *instr, *outstr; 1264 { 1265 int c, cnt, bare_lfs, netfd, filefd, rval; 1266 char buf[BUFSIZ]; 1267 #ifdef __GNUC__ 1268 (void) &bare_lfs; 1269 #endif 1270 1271 bare_lfs = 0; 1272 transflag = 1; 1273 rval = -1; 1274 if (setjmp(urgcatch)) 1275 goto cleanup_recv_data; 1276 1277 switch (type) { 1278 1279 case TYPE_I: 1280 case TYPE_L: 1281 netfd = fileno(instr); 1282 filefd = fileno(outstr); 1283 (void) alarm(curclass.timeout); 1284 while ((cnt = read(netfd, buf, sizeof(buf))) > 0) { 1285 if (write(filefd, buf, cnt) != cnt) 1286 goto file_err; 1287 (void) alarm(curclass.timeout); 1288 byte_count += cnt; 1289 total_data_in += cnt; 1290 total_data += cnt; 1291 total_bytes_in += cnt; 1292 total_bytes += cnt; 1293 } 1294 if (cnt < 0) 1295 goto data_err; 1296 rval = 0; 1297 goto cleanup_recv_data; 1298 1299 case TYPE_E: 1300 reply(553, "TYPE E not implemented."); 1301 goto cleanup_recv_data; 1302 1303 case TYPE_A: 1304 (void) alarm(curclass.timeout); 1305 while ((c = getc(instr)) != EOF) { 1306 byte_count++; 1307 total_data_in++; 1308 total_data++; 1309 total_bytes_in++; 1310 total_bytes++; 1311 if ((byte_count % 4096) == 0) 1312 (void) alarm(curclass.timeout); 1313 if (c == '\n') 1314 bare_lfs++; 1315 while (c == '\r') { 1316 if (ferror(outstr)) 1317 goto data_err; 1318 if ((c = getc(instr)) != '\n') { 1319 byte_count++; 1320 total_data_in++; 1321 total_data++; 1322 total_bytes_in++; 1323 total_bytes++; 1324 if ((byte_count % 4096) == 0) 1325 (void) alarm(curclass.timeout); 1326 (void) putc ('\r', outstr); 1327 if (c == '\0' || c == EOF) 1328 goto contin2; 1329 } 1330 } 1331 (void) putc(c, outstr); 1332 contin2: ; 1333 } 1334 (void) alarm(0); 1335 fflush(outstr); 1336 if (ferror(instr)) 1337 goto data_err; 1338 if (ferror(outstr)) 1339 goto file_err; 1340 if (bare_lfs) { 1341 lreply(226, 1342 "WARNING! %d bare linefeeds received in ASCII mode", 1343 bare_lfs); 1344 lreply(0, "File may not have transferred correctly."); 1345 } 1346 rval = 0; 1347 goto cleanup_recv_data; 1348 1349 default: 1350 reply(550, "Unimplemented TYPE %d in receive_data", type); 1351 goto cleanup_recv_data; 1352 } 1353 1354 data_err: 1355 (void) alarm(0); 1356 perror_reply(426, "Data Connection"); 1357 goto cleanup_recv_data; 1358 1359 file_err: 1360 (void) alarm(0); 1361 perror_reply(452, "Error writing file"); 1362 goto cleanup_recv_data; 1363 1364 cleanup_recv_data: 1365 (void) alarm(0); 1366 transflag = 0; 1367 total_files_in++; 1368 total_files++; 1369 total_xfers_in++; 1370 total_xfers++; 1371 return (rval); 1372 } 1373 1374 void 1375 statfilecmd(filename) 1376 const char *filename; 1377 { 1378 FILE *fin; 1379 int c; 1380 char line[LINE_MAX]; 1381 1382 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1383 fin = ftpd_popen(line, "r", STDOUT_FILENO); 1384 lreply(211, "status of %s:", filename); 1385 while ((c = getc(fin)) != EOF) { 1386 if (c == '\n') { 1387 if (ferror(stdout)){ 1388 perror_reply(421, "control connection"); 1389 (void) ftpd_pclose(fin); 1390 dologout(1); 1391 /* NOTREACHED */ 1392 } 1393 if (ferror(fin)) { 1394 perror_reply(551, filename); 1395 (void) ftpd_pclose(fin); 1396 return; 1397 } 1398 (void) putc('\r', stdout); 1399 total_bytes++; 1400 total_bytes_out++; 1401 } 1402 (void) putc(c, stdout); 1403 total_bytes++; 1404 total_bytes_out++; 1405 } 1406 (void) ftpd_pclose(fin); 1407 reply(211, "End of Status"); 1408 } 1409 1410 void 1411 statcmd() 1412 { 1413 struct sockaddr_in *sin; 1414 u_char *a, *p; 1415 off_t b, otbi, otbo, otb; 1416 1417 lreply(211, "%s FTP server status:", hostname); 1418 lreply(0, "%s", version); 1419 if (isdigit(remotehost[0])) 1420 lreply(0, "Connected to %s", remotehost); 1421 else 1422 lreply(0, "Connected to %s (%s)", remotehost, 1423 inet_ntoa(his_addr.sin_addr)); 1424 if (logged_in) { 1425 if (guest) 1426 lreply(0, "Logged in anonymously"); 1427 else 1428 lreply(0, "Logged in as %s", pw->pw_name); 1429 } else if (askpasswd) 1430 lreply(0, "Waiting for password"); 1431 else 1432 lreply(0, "Waiting for user name"); 1433 b = printf(" TYPE: %s", typenames[type]); 1434 total_bytes += b; 1435 total_bytes_out += b; 1436 if (type == TYPE_A || type == TYPE_E) { 1437 b = printf(", FORM: %s", formnames[form]); 1438 total_bytes += b; 1439 total_bytes_out += b; 1440 } 1441 if (type == TYPE_L) { 1442 #if NBBY == 8 1443 b = printf(" %d", NBBY); 1444 #else 1445 /* XXX: `bytesize' needs to be defined in this case */ 1446 b = printf(" %d", bytesize); 1447 #endif 1448 total_bytes += b; 1449 total_bytes_out += b; 1450 } 1451 b = printf("; STRUcture: %s; transfer MODE: %s\r\n", 1452 strunames[stru], modenames[mode]); 1453 total_bytes += b; 1454 total_bytes_out += b; 1455 if (data != -1) 1456 lreply(0, "Data connection open"); 1457 else if (pdata != -1) { 1458 b = printf(" in Passive mode"); 1459 total_bytes += b; 1460 total_bytes_out += b; 1461 sin = &pasv_addr; 1462 goto printaddr; 1463 } else if (usedefault == 0) { 1464 b = printf(" PORT"); 1465 total_bytes += b; 1466 total_bytes_out += b; 1467 sin = &data_dest; 1468 printaddr: 1469 a = (u_char *) &sin->sin_addr; 1470 p = (u_char *) &sin->sin_port; 1471 #define UC(b) (((int) b) & 0xff) 1472 b = printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1473 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1474 #undef UC 1475 total_bytes += b; 1476 total_bytes_out += b; 1477 } else 1478 lreply(0, "No data connection"); 1479 1480 if (logged_in) { 1481 lreply(0, "Data sent: %qd byte%s in %qd file%s", 1482 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1483 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1484 lreply(0, "Data received: %qd byte%s in %qd file%s", 1485 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1486 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1487 lreply(0, "Total data: %qd byte%s in %qd file%s", 1488 (qdfmt_t)total_data, PLURAL(total_data), 1489 (qdfmt_t)total_files, PLURAL(total_files)); 1490 } 1491 otbi = total_bytes_in; 1492 otbo = total_bytes_out; 1493 otb = total_bytes; 1494 lreply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1495 (qdfmt_t)otbo, PLURAL(otbo), 1496 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1497 lreply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1498 (qdfmt_t)otbi, PLURAL(otbi), 1499 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1500 lreply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1501 (qdfmt_t)otb, PLURAL(otb), 1502 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1503 1504 if (logged_in) { 1505 struct ftpconv *cp; 1506 1507 lreply(0, ""); 1508 lreply(0, "Class: %s", curclass.classname); 1509 lreply(0, "Check PORT commands: %sabled", 1510 curclass.checkportcmd ? "en" : "dis"); 1511 if (curclass.display) 1512 lreply(0, "Display file: %s", curclass.display); 1513 if (curclass.notify) 1514 lreply(0, "Notify fileglob: %s", curclass.notify); 1515 lreply(0, "Idle timeout: %d, maximum timeout: %d", 1516 curclass.timeout, curclass.maxtimeout); 1517 lreply(0, "DELE, MKD, RMD, UMASK, CHMOD commands: %sabled", 1518 curclass.modify ? "en" : "dis"); 1519 lreply(0, "Umask: %.04o", curclass.umask); 1520 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1521 if (cp->suffix == NULL || cp->types == NULL || 1522 cp->command == NULL) 1523 continue; 1524 lreply(0, 1525 "Conversion: %s [%s] disable: %s, command: %s", 1526 cp->suffix, cp->types, cp->disable, cp->command); 1527 } 1528 } 1529 1530 reply(211, "End of status"); 1531 } 1532 1533 void 1534 fatal(s) 1535 const char *s; 1536 { 1537 1538 reply(451, "Error in server: %s\n", s); 1539 reply(221, "Closing connection due to server error."); 1540 dologout(0); 1541 /* NOTREACHED */ 1542 } 1543 1544 void 1545 #ifdef __STDC__ 1546 reply(int n, const char *fmt, ...) 1547 #else 1548 reply(n, fmt, va_alist) 1549 int n; 1550 char *fmt; 1551 va_dcl 1552 #endif 1553 { 1554 off_t b; 1555 va_list ap; 1556 #ifdef __STDC__ 1557 va_start(ap, fmt); 1558 #else 1559 va_start(ap); 1560 #endif 1561 b = 0; 1562 b += printf("%d ", n); 1563 b += vprintf(fmt, ap); 1564 b += printf("\r\n"); 1565 total_bytes += b; 1566 total_bytes_out += b; 1567 (void)fflush(stdout); 1568 if (debug) { 1569 syslog(LOG_DEBUG, "<--- %d ", n); 1570 vsyslog(LOG_DEBUG, fmt, ap); 1571 } 1572 } 1573 1574 void 1575 #ifdef __STDC__ 1576 lreply(int n, const char *fmt, ...) 1577 #else 1578 lreply(n, fmt, va_alist) 1579 int n; 1580 char *fmt; 1581 va_dcl 1582 #endif 1583 { 1584 off_t b; 1585 va_list ap; 1586 #ifdef __STDC__ 1587 va_start(ap, fmt); 1588 #else 1589 va_start(ap); 1590 #endif 1591 b = 0; 1592 switch (n) { 1593 case 0: 1594 b += printf(" "); 1595 case -1: 1596 break; 1597 default: 1598 b += printf("%d-", n); 1599 break; 1600 } 1601 b += vprintf(fmt, ap); 1602 b += printf("\r\n"); 1603 total_bytes += b; 1604 total_bytes_out += b; 1605 (void)fflush(stdout); 1606 if (debug) { 1607 syslog(LOG_DEBUG, "<--- %d- ", n); 1608 vsyslog(LOG_DEBUG, fmt, ap); 1609 } 1610 } 1611 1612 static void 1613 ack(s) 1614 const char *s; 1615 { 1616 1617 reply(250, "%s command successful.", s); 1618 } 1619 1620 void 1621 delete(name) 1622 const char *name; 1623 { 1624 char *p = NULL; 1625 1626 if (remove(name) < 0) { 1627 p = strerror(errno); 1628 perror_reply(550, name); 1629 } else 1630 ack("DELE"); 1631 logcmd("delete", -1, name, NULL, NULL, p); 1632 } 1633 1634 void 1635 cwd(path) 1636 const char *path; 1637 { 1638 1639 if (chdir(path) < 0) 1640 perror_reply(550, path); 1641 else { 1642 show_chdir_messages(250); 1643 ack("CWD"); 1644 } 1645 } 1646 1647 static void 1648 replydirname(name, message) 1649 const char *name, *message; 1650 { 1651 char npath[MAXPATHLEN + 1]; 1652 int i; 1653 1654 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 1655 npath[i] = *name; 1656 if (*name == '"') 1657 npath[++i] = '"'; 1658 } 1659 npath[i] = '\0'; 1660 reply(257, "\"%s\" %s", npath, message); 1661 } 1662 1663 void 1664 makedir(name) 1665 const char *name; 1666 { 1667 char *p = NULL; 1668 1669 if (mkdir(name, 0777) < 0) { 1670 p = strerror(errno); 1671 perror_reply(550, name); 1672 } else 1673 replydirname(name, "directory created."); 1674 logcmd("mkdir", -1, name, NULL, NULL, p); 1675 } 1676 1677 void 1678 removedir(name) 1679 const char *name; 1680 { 1681 char *p = NULL; 1682 1683 if (rmdir(name) < 0) { 1684 p = strerror(errno); 1685 perror_reply(550, name); 1686 } else 1687 ack("RMD"); 1688 logcmd("rmdir", -1, name, NULL, NULL, p); 1689 } 1690 1691 void 1692 pwd() 1693 { 1694 char path[MAXPATHLEN + 1]; 1695 1696 if (getcwd(path, sizeof(path) - 1) == NULL) 1697 reply(550, "Can't get the current directory: %s.", 1698 strerror(errno)); 1699 else 1700 replydirname(path, "is the current directory."); 1701 } 1702 1703 char * 1704 renamefrom(name) 1705 char *name; 1706 { 1707 struct stat st; 1708 1709 if (stat(name, &st) < 0) { 1710 perror_reply(550, name); 1711 return (NULL); 1712 } 1713 reply(350, "File exists, ready for destination name"); 1714 return (name); 1715 } 1716 1717 void 1718 renamecmd(from, to) 1719 const char *from, *to; 1720 { 1721 char *p = NULL; 1722 1723 if (rename(from, to) < 0) { 1724 p = strerror(errno); 1725 perror_reply(550, "rename"); 1726 } else 1727 ack("RNTO"); 1728 logcmd("rename", -1, from, to, NULL, p); 1729 } 1730 1731 static void 1732 dolog(sin) 1733 struct sockaddr_in *sin; 1734 { 1735 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1736 sizeof(struct in_addr), AF_INET); 1737 1738 if (hp) 1739 (void)strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1740 else 1741 (void)strncpy(remotehost, inet_ntoa(sin->sin_addr), 1742 sizeof(remotehost)); 1743 remotehost[sizeof(remotehost) - 1] = '\0'; 1744 #ifdef HASSETPROCTITLE 1745 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1746 setproctitle(proctitle); 1747 #endif /* HASSETPROCTITLE */ 1748 1749 if (logging) 1750 syslog(LOG_INFO, "connection from %s", remotehost); 1751 } 1752 1753 /* 1754 * Record logout in wtmp file 1755 * and exit with supplied status. 1756 */ 1757 void 1758 dologout(status) 1759 int status; 1760 { 1761 /* 1762 * Prevent reception of SIGURG from resulting in a resumption 1763 * back to the main program loop. 1764 */ 1765 transflag = 0; 1766 1767 if (logged_in) { 1768 (void) seteuid((uid_t)0); 1769 logwtmp(ttyline, "", ""); 1770 #ifdef KERBEROS 1771 if (!notickets && krbtkfile_env) 1772 unlink(krbtkfile_env); 1773 #endif 1774 } 1775 /* beware of flushing buffers after a SIGPIPE */ 1776 _exit(status); 1777 } 1778 1779 static void 1780 myoob(signo) 1781 int signo; 1782 { 1783 char *cp; 1784 1785 /* only process if transfer occurring */ 1786 if (!transflag) 1787 return; 1788 cp = tmpline; 1789 if (getline(cp, 7, stdin) == NULL) { 1790 reply(221, "You could at least say goodbye."); 1791 dologout(0); 1792 } 1793 if (strcasecmp(cp, "ABOR\r\n") == 0) { 1794 tmpline[0] = '\0'; 1795 reply(426, "Transfer aborted. Data connection closed."); 1796 reply(226, "Abort successful"); 1797 longjmp(urgcatch, 1); 1798 } 1799 if (strcasecmp(cp, "STAT\r\n") == 0) { 1800 if (file_size != (off_t) -1) 1801 reply(213, "Status: %qd of %qd byte%s transferred", 1802 (qdfmt_t)byte_count, (qdfmt_t)file_size, 1803 PLURAL(byte_count)); 1804 else 1805 reply(213, "Status: %qd byte%s transferred", 1806 (qdfmt_t)byte_count, PLURAL(byte_count)); 1807 } 1808 } 1809 1810 /* 1811 * Note: a response of 425 is not mentioned as a possible response to 1812 * the PASV command in RFC959. However, it has been blessed as 1813 * a legitimate response by Jon Postel in a telephone conversation 1814 * with Rick Adams on 25 Jan 89. 1815 */ 1816 void 1817 passive() 1818 { 1819 int len; 1820 char *p, *a; 1821 1822 pdata = socket(AF_INET, SOCK_STREAM, 0); 1823 if (pdata < 0 || !logged_in) { 1824 perror_reply(425, "Can't open passive connection"); 1825 return; 1826 } 1827 pasv_addr = ctrl_addr; 1828 pasv_addr.sin_port = 0; 1829 (void) seteuid((uid_t)0); 1830 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1831 (void) seteuid((uid_t)pw->pw_uid); 1832 goto pasv_error; 1833 } 1834 (void) seteuid((uid_t)pw->pw_uid); 1835 len = sizeof(pasv_addr); 1836 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1837 goto pasv_error; 1838 if (listen(pdata, 1) < 0) 1839 goto pasv_error; 1840 a = (char *) &pasv_addr.sin_addr; 1841 p = (char *) &pasv_addr.sin_port; 1842 1843 #define UC(b) (((int) b) & 0xff) 1844 1845 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1846 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1847 return; 1848 1849 pasv_error: 1850 (void) close(pdata); 1851 pdata = -1; 1852 perror_reply(425, "Can't open passive connection"); 1853 return; 1854 } 1855 1856 /* 1857 * Generate unique name for file with basename "local". 1858 * The file named "local" is already known to exist. 1859 * Generates failure reply on error. 1860 * 1861 * XXX this function should under go changes similar to 1862 * the mktemp(3)/mkstemp(3) changes. 1863 */ 1864 static char * 1865 gunique(local) 1866 const char *local; 1867 { 1868 static char new[MAXPATHLEN + 1]; 1869 struct stat st; 1870 int count, len; 1871 char *cp; 1872 1873 cp = strrchr(local, '/'); 1874 if (cp) 1875 *cp = '\0'; 1876 if (stat(cp ? local : ".", &st) < 0) { 1877 perror_reply(553, cp ? local : "."); 1878 return (NULL); 1879 } 1880 if (cp) 1881 *cp = '/'; 1882 (void) strcpy(new, local); 1883 len = strlen(new); 1884 cp = new + len; 1885 *cp++ = '.'; 1886 for (count = 1; count < 100; count++) { 1887 (void)snprintf(cp, sizeof(new) - len - 2, "%d", count); 1888 if (stat(new, &st) < 0) 1889 return (new); 1890 } 1891 reply(452, "Unique file name cannot be created."); 1892 return (NULL); 1893 } 1894 1895 /* 1896 * Format and send reply containing system error number. 1897 */ 1898 void 1899 perror_reply(code, string) 1900 int code; 1901 const char *string; 1902 { 1903 int save_errno; 1904 1905 save_errno = errno; 1906 reply(code, "%s: %s.", string, strerror(errno)); 1907 errno = save_errno; 1908 } 1909 1910 static char *onefile[] = { 1911 "", 1912 0 1913 }; 1914 1915 void 1916 send_file_list(whichf) 1917 const char *whichf; 1918 { 1919 struct stat st; 1920 DIR *dirp = NULL; 1921 struct dirent *dir; 1922 FILE *dout = NULL; 1923 char **dirlist, *dirname, *p; 1924 int simple = 0; 1925 int freeglob = 0; 1926 glob_t gl; 1927 off_t b; 1928 1929 #ifdef __GNUC__ 1930 (void) &dout; 1931 (void) &dirlist; 1932 (void) &simple; 1933 (void) &freeglob; 1934 #endif 1935 1936 p = NULL; 1937 if (strpbrk(whichf, "~{[*?") != NULL) { 1938 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 1939 1940 memset(&gl, 0, sizeof(gl)); 1941 freeglob = 1; 1942 if (glob(whichf, flags, 0, &gl)) { 1943 reply(550, "not found"); 1944 goto out; 1945 } else if (gl.gl_pathc == 0) { 1946 errno = ENOENT; 1947 perror_reply(550, whichf); 1948 goto out; 1949 } 1950 dirlist = gl.gl_pathv; 1951 } else { 1952 p = xstrdup(whichf); 1953 onefile[0] = p; 1954 dirlist = onefile; 1955 simple = 1; 1956 } 1957 /* XXX: } for vi sm */ 1958 1959 if (setjmp(urgcatch)) { 1960 transflag = 0; 1961 goto out; 1962 } 1963 while ((dirname = *dirlist++) != NULL) { 1964 int trailingslash = 0; 1965 1966 if (stat(dirname, &st) < 0) { 1967 /* 1968 * If user typed "ls -l", etc, and the client 1969 * used NLST, do what the user meant. 1970 */ 1971 if (dirname[0] == '-' && *dirlist == NULL && 1972 transflag == 0) { 1973 retrieve("/bin/ls %s", dirname); 1974 goto out; 1975 } 1976 perror_reply(550, whichf); 1977 if (dout != NULL) { 1978 (void) fclose(dout); 1979 transflag = 0; 1980 data = -1; 1981 pdata = -1; 1982 } 1983 goto out; 1984 } 1985 1986 if (S_ISREG(st.st_mode)) { 1987 if (dout == NULL) { 1988 dout = dataconn("file list", (off_t)-1, "w"); 1989 if (dout == NULL) 1990 goto out; 1991 transflag++; 1992 } 1993 b = fprintf(dout, "%s%s\n", dirname, 1994 type == TYPE_A ? "\r" : ""); 1995 total_bytes += b; 1996 total_bytes_out += b; 1997 byte_count += strlen(dirname) + 1; 1998 continue; 1999 } else if (!S_ISDIR(st.st_mode)) 2000 continue; 2001 2002 if (dirname[strlen(dirname) - 1] == '/') 2003 trailingslash++; 2004 2005 if ((dirp = opendir(dirname)) == NULL) 2006 continue; 2007 2008 while ((dir = readdir(dirp)) != NULL) { 2009 char nbuf[MAXPATHLEN + 1]; 2010 2011 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2012 continue; 2013 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2014 dir->d_namlen == 2) 2015 continue; 2016 2017 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2018 trailingslash ? "" : "/", dir->d_name); 2019 2020 /* 2021 * We have to do a stat to ensure it's 2022 * not a directory or special file. 2023 */ 2024 if (simple || (stat(nbuf, &st) == 0 && 2025 S_ISREG(st.st_mode))) { 2026 char *p; 2027 2028 if (dout == NULL) { 2029 dout = dataconn("file list", (off_t)-1, 2030 "w"); 2031 if (dout == NULL) 2032 goto out; 2033 transflag++; 2034 } 2035 p = nbuf; 2036 if (nbuf[0] == '.' && nbuf[1] == '/') 2037 p = &nbuf[2]; 2038 b = fprintf(dout, "%s%s\n", p, 2039 type == TYPE_A ? "\r" : ""); 2040 total_bytes += b; 2041 total_bytes_out += b; 2042 byte_count += strlen(nbuf) + 1; 2043 } 2044 } 2045 (void) closedir(dirp); 2046 } 2047 2048 if (dout == NULL) 2049 reply(550, "No files found."); 2050 else if (ferror(dout) != 0) 2051 perror_reply(550, "Data connection"); 2052 else 2053 reply(226, "Transfer complete."); 2054 2055 transflag = 0; 2056 if (dout != NULL) 2057 (void) fclose(dout); 2058 data = -1; 2059 pdata = -1; 2060 out: 2061 total_xfers++; 2062 total_xfers_out++; 2063 if (p) 2064 free(p); 2065 if (freeglob) 2066 globfree(&gl); 2067 } 2068 2069 char * 2070 conffilename(s) 2071 const char *s; 2072 { 2073 static char filename[MAXPATHLEN + 1]; 2074 2075 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2076 return filename; 2077 } 2078 2079 /* 2080 * logcmd -- 2081 * based on the arguments, syslog a message: 2082 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2083 * else if file2 != NULL "<command> <file1> <file2>" 2084 * else "<command> <file1>" 2085 * if elapsed != NULL, append "in xxx.yyy seconds" 2086 * if error != NULL, append ": " + error 2087 */ 2088 2089 void 2090 logcmd(command, bytes, file1, file2, elapsed, error) 2091 const char *command; 2092 off_t bytes; 2093 const char *file1; 2094 const char *file2; 2095 const struct timeval *elapsed; 2096 const char *error; 2097 { 2098 char buf[MAXPATHLEN + 100], realfile[MAXPATHLEN + 1]; 2099 const char *p; 2100 size_t len; 2101 2102 if (logging <=1) 2103 return; 2104 2105 if ((p = realpath(file1, realfile)) == NULL) { 2106 #if 0 /* XXX: too noisy */ 2107 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2108 realfile, strerror(errno)); 2109 #endif 2110 p = file1; 2111 } 2112 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2113 2114 if (bytes != (off_t)-1) { 2115 len += snprintf(buf + len, sizeof(buf) - len, 2116 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2117 } else if (file2 != NULL) { 2118 if ((p = realpath(file2, realfile)) == NULL) { 2119 #if 0 /* XXX: too noisy */ 2120 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2121 realfile, strerror(errno)); 2122 #endif 2123 p = file2; 2124 } 2125 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2126 } 2127 2128 if (elapsed != NULL) { 2129 len += snprintf(buf + len, sizeof(buf) - len, 2130 " in %ld.%.03d seconds", elapsed->tv_sec, 2131 (int)(elapsed->tv_usec / 1000)); 2132 } 2133 2134 if (error != NULL) 2135 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2136 2137 syslog(LOG_INFO, "%s", buf); 2138 } 2139 2140 char * 2141 xstrdup(s) 2142 const char *s; 2143 { 2144 char *new = strdup(s); 2145 2146 if (new == NULL) 2147 fatal("Local resource failure: malloc"); 2148 /* NOTREACHED */ 2149 return (new); 2150 } 2151
Indexes created Fri Sep 26 08:10:20 GMT 2025