1 /* $NetBSD: ftpd.c,v 1.119 2001/01/10 00:20:49 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 41 * The Regents of the University of California. All rights reserved. 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 University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 */ 71 72 /* 73 * Copyright (C) 1997 and 1998 WIDE Project. 74 * All rights reserved. 75 * 76 * Redistribution and use in source and binary forms, with or without 77 * modification, are permitted provided that the following conditions 78 * are met: 79 * 1. Redistributions of source code must retain the above copyright 80 * notice, this list of conditions and the following disclaimer. 81 * 2. Redistributions in binary form must reproduce the above copyright 82 * notice, this list of conditions and the following disclaimer in the 83 * documentation and/or other materials provided with the distribution. 84 * 3. Neither the name of the project nor the names of its contributors 85 * may be used to endorse or promote products derived from this software 86 * without specific prior written permission. 87 * 88 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 89 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 90 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 91 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 92 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 93 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 94 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 95 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 96 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 97 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 98 * SUCH DAMAGE. 99 */ 100 101 #include <sys/cdefs.h> 102 #ifndef lint 103 __COPYRIGHT( 104 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 105 The Regents of the University of California. All rights reserved.\n"); 106 #endif /* not lint */ 107 108 #ifndef lint 109 #if 0 110 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 111 #else 112 __RCSID("$NetBSD: ftpd.c,v 1.119 2001/01/10 00:20:49 lukem Exp $"); 113 #endif 114 #endif /* not lint */ 115 116 /* 117 * FTP server. 118 */ 119 #include <sys/param.h> 120 #include <sys/stat.h> 121 #include <sys/ioctl.h> 122 #include <sys/socket.h> 123 #include <sys/wait.h> 124 125 #include <netinet/in.h> 126 #include <netinet/in_systm.h> 127 #include <netinet/ip.h> 128 129 #define FTP_NAMES 130 #include <arpa/ftp.h> 131 #include <arpa/inet.h> 132 #include <arpa/telnet.h> 133 134 #include <ctype.h> 135 #include <dirent.h> 136 #include <err.h> 137 #include <errno.h> 138 #include <fcntl.h> 139 #include <fnmatch.h> 140 #include <glob.h> 141 #include <grp.h> 142 #include <limits.h> 143 #include <netdb.h> 144 #include <pwd.h> 145 #include <setjmp.h> 146 #include <signal.h> 147 #include <stdarg.h> 148 #include <stdio.h> 149 #include <stdlib.h> 150 #include <string.h> 151 #include <syslog.h> 152 #include <time.h> 153 #include <tzfile.h> 154 #include <unistd.h> 155 #include <util.h> 156 #include <utmp.h> 157 #ifdef SKEY 158 #include <skey.h> 159 #endif 160 #ifdef KERBEROS5 161 #include <com_err.h> 162 #include <krb5/krb5.h> 163 #endif 164 165 #define GLOBAL 166 #include "extern.h" 167 #include "pathnames.h" 168 #include "version.h" 169 170 int data; 171 jmp_buf urgcatch; 172 struct passwd *pw; 173 int sflag; 174 int stru; /* avoid C keyword */ 175 int mode; 176 int dataport; /* use specific data port */ 177 int dopidfile; /* maintain pid file */ 178 int doutmp; /* update utmp file */ 179 int dowtmp; /* update wtmp file */ 180 int doxferlog; /* syslog wu-ftpd style xferlog entries */ 181 int dropprivs; /* if privileges should or have been dropped */ 182 int mapped; /* IPv4 connection on AF_INET6 socket */ 183 off_t file_size; 184 off_t byte_count; 185 static char ttyline[20]; 186 static struct utmp utmp; /* for utmp */ 187 188 static const char *anondir = NULL; 189 static const char *confdir = _DEFAULT_CONFDIR; 190 191 #if defined(KERBEROS) || defined(KERBEROS5) 192 int has_ccache = 0; 193 int notickets = 1; 194 char *krbtkfile_env = NULL; 195 char *tty = ttyline; 196 int login_krb5_forwardable_tgt = 0; 197 #endif 198 199 int epsvall = 0; 200 201 /* 202 * Timeout intervals for retrying connections 203 * to hosts that don't accept PORT cmds. This 204 * is a kludge, but given the problems with TCP... 205 */ 206 #define SWAITMAX 90 /* wait at most 90 seconds */ 207 #define SWAITINT 5 /* interval between retries */ 208 209 int swaitmax = SWAITMAX; 210 int swaitint = SWAITINT; 211 212 static int bind_pasv_addr(void); 213 static int checkuser(const char *, const char *, int, int, char **); 214 static int checkaccess(const char *); 215 static int checkpassword(const struct passwd *, const char *); 216 static void end_login(void); 217 static FILE *getdatasock(const char *); 218 static char *gunique(const char *); 219 static void logremotehost(struct sockinet *); 220 static void lostconn(int); 221 static void myoob(int); 222 static int receive_data(FILE *, FILE *); 223 static int send_data(FILE *, FILE *, off_t, int); 224 static struct passwd *sgetpwnam(const char *); 225 226 int main(int, char *[]); 227 228 #if defined(KERBEROS) 229 int klogin(struct passwd *, char *, char *, char *); 230 void kdestroy(void); 231 #endif 232 #if defined(KERBEROS5) 233 int k5login(struct passwd *, char *, char *, char *); 234 void k5destroy(void); 235 #endif 236 237 int 238 main(int argc, char *argv[]) 239 { 240 int addrlen, ch, on = 1, tos, keepalive; 241 #ifdef KERBEROS5 242 krb5_error_code kerror; 243 #endif 244 char *p; 245 246 connections = 1; 247 debug = 0; 248 logging = 0; 249 pdata = -1; 250 sflag = 0; 251 dataport = 0; 252 dopidfile = 1; /* default: DO use a pid file to count users */ 253 doutmp = 0; /* default: Do NOT log to utmp */ 254 dowtmp = 1; /* default: DO log to wtmp */ 255 doxferlog = 0; /* default: Do NOT syslog xferlog */ 256 dropprivs = 0; 257 mapped = 0; 258 usedefault = 1; 259 emailaddr = NULL; 260 hostname[0] = '\0'; 261 homedir[0] = '\0'; 262 gidcount = 0; 263 version = FTPD_VERSION; 264 265 /* 266 * LOG_NDELAY sets up the logging connection immediately, 267 * necessary for anonymous ftp's that chroot and can't do it later. 268 */ 269 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 270 271 while ((ch = getopt(argc, argv, "a:c:C:de:h:HlP:qQrst:T:uUvV:wWX")) 272 != -1) { 273 switch (ch) { 274 case 'a': 275 anondir = optarg; 276 break; 277 278 case 'c': 279 confdir = optarg; 280 break; 281 282 case 'C': 283 pw = sgetpwnam(optarg); 284 exit(checkaccess(optarg) ? 0 : 1); 285 /* NOTREACHED */ 286 287 case 'd': 288 case 'v': /* deprecated */ 289 debug = 1; 290 break; 291 292 case 'e': 293 emailaddr = optarg; 294 break; 295 296 case 'h': 297 strlcpy(hostname, optarg, sizeof(hostname)); 298 break; 299 300 case 'H': 301 if (gethostname(hostname, sizeof(hostname)) == -1) 302 hostname[0] = '\0'; 303 hostname[sizeof(hostname) - 1] = '\0'; 304 break; 305 306 case 'l': 307 logging++; /* > 1 == extra logging */ 308 break; 309 310 case 'P': 311 dataport = (int)strtol(optarg, &p, 10); 312 if (*p != '\0' || dataport < IPPORT_RESERVED || 313 dataport > IPPORT_ANONMAX) { 314 syslog(LOG_WARNING, "Invalid dataport %s", 315 optarg); 316 dataport = 0; 317 } 318 break; 319 320 case 'q': 321 dopidfile = 1; 322 break; 323 324 case 'Q': 325 dopidfile = 0; 326 break; 327 328 case 'r': 329 dropprivs = 1; 330 break; 331 332 case 's': 333 sflag = 1; 334 break; 335 336 case 't': 337 case 'T': 338 syslog(LOG_WARNING, 339 "-%c has been deprecated in favour of ftpd.conf", 340 ch); 341 break; 342 343 case 'u': 344 doutmp = 1; 345 break; 346 347 case 'U': 348 doutmp = 0; 349 break; 350 351 case 'V': 352 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 353 version = NULL; 354 else 355 version = xstrdup(optarg); 356 break; 357 358 case 'w': 359 dowtmp = 1; 360 break; 361 362 case 'W': 363 dowtmp = 0; 364 break; 365 366 case 'X': 367 doxferlog = 1; 368 break; 369 370 default: 371 if (optopt == 'a' || optopt == 'C') 372 exit(1); 373 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 374 break; 375 } 376 } 377 if (EMPTYSTR(confdir)) 378 confdir = _DEFAULT_CONFDIR; 379 380 memset((char *)&his_addr, 0, sizeof(his_addr)); 381 addrlen = sizeof(his_addr.si_su); 382 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 383 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 384 exit(1); 385 } 386 his_addr.su_len = addrlen; 387 memset((char *)&ctrl_addr, 0, sizeof(ctrl_addr)); 388 addrlen = sizeof(ctrl_addr.si_su); 389 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 390 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 391 exit(1); 392 } 393 ctrl_addr.su_len = addrlen; 394 #ifdef INET6 395 if (his_addr.su_family == AF_INET6 396 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 397 #if 1 398 /* 399 * IPv4 control connection arrived to AF_INET6 socket. 400 * I hate to do this, but this is the easiest solution. 401 * 402 * The assumption is untrue on SIIT environment. 403 */ 404 struct sockinet tmp_addr; 405 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 406 407 tmp_addr = his_addr; 408 memset(&his_addr, 0, sizeof(his_addr)); 409 his_addr.su_family = AF_INET; 410 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 411 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 412 sizeof(his_addr.su_addr)); 413 his_addr.su_port = tmp_addr.su_port; 414 415 tmp_addr = ctrl_addr; 416 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 417 ctrl_addr.su_family = AF_INET; 418 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 419 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 420 sizeof(ctrl_addr.su_addr)); 421 ctrl_addr.su_port = tmp_addr.su_port; 422 #else 423 while (fgets(line, sizeof(line), fd) != NULL) { 424 if ((cp = strchr(line, '\n')) != NULL) 425 *cp = '\0'; 426 reply(-530, "%s", line); 427 } 428 (void) fflush(stdout); 429 (void) fclose(fd); 430 reply(530, 431 "Connection from IPv4 mapped address is not supported."); 432 exit(0); 433 #endif 434 435 mapped = 1; 436 } else 437 #endif /* INET6 */ 438 mapped = 0; 439 #ifdef IP_TOS 440 if (!mapped && his_addr.su_family == AF_INET) { 441 tos = IPTOS_LOWDELAY; 442 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 443 sizeof(int)) < 0) 444 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 445 } 446 #endif 447 /* if the hostname hasn't been given, attempt to determine it */ 448 if (hostname[0] == '\0') { 449 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 450 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 0) 451 != 0) 452 (void)gethostname(hostname, sizeof(hostname)); 453 hostname[sizeof(hostname) - 1] = '\0'; 454 } 455 456 /* set this here so klogin can use it... */ 457 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 458 459 (void) freopen(_PATH_DEVNULL, "w", stderr); 460 (void) signal(SIGPIPE, lostconn); 461 (void) signal(SIGCHLD, SIG_IGN); 462 if (signal(SIGURG, myoob) == SIG_ERR) 463 syslog(LOG_WARNING, "signal: %m"); 464 465 /* Try to handle urgent data inline */ 466 #ifdef SO_OOBINLINE 467 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 468 syslog(LOG_WARNING, "setsockopt: %m"); 469 #endif 470 /* Set keepalives on the socket to detect dropped connections. */ 471 #ifdef SO_KEEPALIVE 472 keepalive = 1; 473 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 474 sizeof(int)) < 0) 475 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 476 #endif 477 478 #ifdef F_SETOWN 479 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 480 syslog(LOG_WARNING, "fcntl F_SETOWN: %m"); 481 #endif 482 logremotehost(&his_addr); 483 /* 484 * Set up default state 485 */ 486 data = -1; 487 type = TYPE_A; 488 form = FORM_N; 489 stru = STRU_F; 490 mode = MODE_S; 491 tmpline[0] = '\0'; 492 hasyyerrored = 0; 493 494 #ifdef KERBEROS5 495 kerror = krb5_init_context(&kcontext); 496 if (kerror) { 497 syslog(LOG_ERR, "%s when initializing Kerberos context", 498 error_message(kerror)); 499 exit(0); 500 } 501 #endif /* KERBEROS5 */ 502 503 init_curclass(); 504 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 505 curclass.type = CLASS_REAL; 506 507 /* If logins are disabled, print out the message. */ 508 if (display_file(_PATH_NOLOGIN, 530)) { 509 reply(530, "System not available."); 510 exit(0); 511 } 512 (void)display_file(conffilename(_PATH_FTPWELCOME), 220); 513 /* reply(220,) must follow */ 514 if (EMPTYSTR(version)) 515 reply(220, "%s FTP server ready.", hostname); 516 else 517 reply(220, "%s FTP server (%s) ready.", hostname, version); 518 519 (void) setjmp(errcatch); 520 for (;;) 521 (void) yyparse(); 522 /* NOTREACHED */ 523 } 524 525 static void 526 lostconn(int signo) 527 { 528 529 if (debug) 530 syslog(LOG_DEBUG, "lost connection"); 531 dologout(1); 532 } 533 534 /* 535 * Save the result of a getpwnam. Used for USER command, since 536 * the data returned must not be clobbered by any other command 537 * (e.g., globbing). 538 */ 539 static struct passwd * 540 sgetpwnam(const char *name) 541 { 542 static struct passwd save; 543 struct passwd *p; 544 545 if ((p = getpwnam(name)) == NULL) 546 return (p); 547 if (save.pw_name) { 548 free((char *)save.pw_name); 549 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 550 free((char *)save.pw_passwd); 551 free((char *)save.pw_gecos); 552 free((char *)save.pw_dir); 553 free((char *)save.pw_shell); 554 } 555 save = *p; 556 save.pw_name = xstrdup(p->pw_name); 557 save.pw_passwd = xstrdup(p->pw_passwd); 558 save.pw_gecos = xstrdup(p->pw_gecos); 559 save.pw_dir = xstrdup(p->pw_dir); 560 save.pw_shell = xstrdup(p->pw_shell); 561 return (&save); 562 } 563 564 static int login_attempts; /* number of failed login attempts */ 565 static int askpasswd; /* had user command, ask for passwd */ 566 static char curname[10]; /* current USER name */ 567 568 /* 569 * USER command. 570 * Sets global passwd pointer pw if named account exists and is acceptable; 571 * sets askpasswd if a PASS command is expected. If logged in previously, 572 * need to reset state. If name is "ftp" or "anonymous", the name is not in 573 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 574 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 575 * requesting login privileges. Disallow anyone who does not have a standard 576 * shell as returned by getusershell(). Disallow anyone mentioned in the file 577 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 578 */ 579 void 580 user(const char *name) 581 { 582 if (logged_in) { 583 switch (curclass.type) { 584 case CLASS_GUEST: 585 reply(530, "Can't change user from guest login."); 586 return; 587 case CLASS_CHROOT: 588 reply(530, "Can't change user from chroot user."); 589 return; 590 case CLASS_REAL: 591 if (dropprivs) { 592 reply(530, "Can't change user."); 593 return; 594 } 595 end_login(); 596 break; 597 default: 598 abort(); 599 } 600 } 601 602 #if defined(KERBEROS) 603 kdestroy(); 604 #endif 605 #if defined(KERBEROS5) 606 k5destroy(); 607 #endif 608 609 curclass.type = CLASS_REAL; 610 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 611 /* need `pw' setup for checkaccess() and checkuser () */ 612 if ((pw = sgetpwnam("ftp")) == NULL) 613 reply(530, "User %s unknown.", name); 614 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 615 reply(530, "User %s access denied.", name); 616 else { 617 curclass.type = CLASS_GUEST; 618 askpasswd = 1; 619 reply(331, 620 "Guest login ok, type your name as password."); 621 } 622 if (!askpasswd && logging) 623 syslog(LOG_NOTICE, 624 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 625 return; 626 } 627 628 pw = sgetpwnam(name); 629 if (logging) 630 strlcpy(curname, name, sizeof(curname)); 631 632 #ifdef SKEY 633 if (skey_haskey(name) == 0) { 634 const char *myskey; 635 636 myskey = skey_keyinfo(name); 637 reply(331, "Password [%s] required for %s.", 638 myskey ? myskey : "error getting challenge", name); 639 } else 640 #endif 641 reply(331, "Password required for %s.", name); 642 643 askpasswd = 1; 644 /* 645 * Delay before reading passwd after first failed 646 * attempt to slow down passwd-guessing programs. 647 */ 648 if (login_attempts) 649 sleep((unsigned) login_attempts); 650 } 651 652 /* 653 * Determine whether something is to happen (allow access, chroot) 654 * for a user. Each line is a shell-style glob followed by 655 * `yes' or `no'. 656 * 657 * For backward compatability, `allow' and `deny' are synonymns 658 * for `yes' and `no', respectively. 659 * 660 * Each glob is matched against the username in turn, and the first 661 * match found is used. If no match is found, the result is the 662 * argument `def'. If a match is found but without and explicit 663 * `yes'/`no', the result is the opposite of def. 664 * 665 * If the file doesn't exist at all, the result is the argument 666 * `nofile' 667 * 668 * Any line starting with `#' is considered a comment and ignored. 669 * 670 * Returns 0 if the user is denied, or 1 if they are allowed. 671 * 672 * NOTE: needs struct passwd *pw setup before use. 673 */ 674 static int 675 checkuser(const char *fname, const char *name, int def, int nofile, 676 char **retclass) 677 { 678 FILE *fd; 679 int retval; 680 char *glob, *perm, *class, *buf, *p; 681 size_t len, line; 682 683 retval = def; 684 if (retclass != NULL) 685 *retclass = NULL; 686 if ((fd = fopen(conffilename(fname), "r")) == NULL) 687 return nofile; 688 689 line = 0; 690 for (; 691 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 692 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 693 free(buf), buf = NULL) { 694 glob = perm = class = NULL; 695 p = buf; 696 if (len < 1) 697 continue; 698 if (p[len - 1] == '\n') 699 p[--len] = '\0'; 700 if (EMPTYSTR(p)) 701 continue; 702 703 NEXTWORD(p, glob); 704 NEXTWORD(p, perm); 705 NEXTWORD(p, class); 706 if (EMPTYSTR(glob)) 707 continue; 708 if (!EMPTYSTR(class)) { 709 if (strcasecmp(class, "all") == 0 || 710 strcasecmp(class, "none") == 0) { 711 syslog(LOG_WARNING, 712 "%s line %d: illegal user-defined class `%s' - skipping entry", 713 fname, (int)line, class); 714 continue; 715 } 716 } 717 718 /* have a host specifier */ 719 if ((p = strchr(glob, '@')) != NULL) { 720 unsigned long net, mask, addr; 721 int bits; 722 723 *p++ = '\0'; 724 /* check against network or CIDR */ 725 if (isdigit(*p) && 726 (bits = inet_net_pton(AF_INET, p, 727 &net, sizeof(net))) != -1) { 728 net = ntohl(net); 729 mask = 0xffffffffU << (32 - bits); 730 addr = ntohl(his_addr.su_addr.s_addr); 731 if ((addr & mask) != net) 732 continue; 733 734 /* check against hostname glob */ 735 } else if (fnmatch(p, remotehost, 0) != 0) 736 continue; 737 } 738 739 /* have a group specifier */ 740 if ((p = strchr(glob, ':')) != NULL) { 741 gid_t *groups, *ng; 742 int gsize, i, found; 743 744 *p++ = '\0'; 745 groups = NULL; 746 gsize = 16; 747 do { 748 ng = realloc(groups, gsize * sizeof(gid_t)); 749 if (ng == NULL) 750 fatal( 751 "Local resource failure: realloc"); 752 groups = ng; 753 } while (getgrouplist(pw->pw_name, pw->pw_gid, 754 groups, &gsize) == -1); 755 found = 0; 756 for (i = 0; i < gsize; i++) { 757 struct group *g; 758 759 if ((g = getgrgid(groups[i])) == NULL) 760 continue; 761 if (fnmatch(p, g->gr_name, 0) == 0) { 762 found = 1; 763 break; 764 } 765 } 766 free(groups); 767 if (!found) 768 continue; 769 } 770 771 /* check against username glob */ 772 if (fnmatch(glob, name, 0) != 0) 773 continue; 774 775 if (perm != NULL && 776 ((strcasecmp(perm, "allow") == 0) || 777 (strcasecmp(perm, "yes") == 0))) 778 retval = 1; 779 else if (perm != NULL && 780 ((strcasecmp(perm, "deny") == 0) || 781 (strcasecmp(perm, "no") == 0))) 782 retval = 0; 783 else 784 retval = !def; 785 if (!EMPTYSTR(class) && retclass != NULL) 786 *retclass = xstrdup(class); 787 free(buf); 788 break; 789 } 790 (void) fclose(fd); 791 return (retval); 792 } 793 794 /* 795 * Check if user is allowed by /etc/ftpusers 796 * returns 1 for yes, 0 for no 797 * 798 * NOTE: needs struct passwd *pw setup (for checkuser()) 799 */ 800 static int 801 checkaccess(const char *name) 802 { 803 804 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 805 } 806 807 /* 808 * Terminate login as previous user (if any), resetting state; 809 * used when USER command is given or login fails. 810 */ 811 static void 812 end_login(void) 813 { 814 815 if (logged_in) { 816 if (dowtmp) 817 logwtmp(ttyline, "", ""); 818 if (doutmp) 819 logout(utmp.ut_line); 820 } 821 /* reset login state */ 822 show_chdir_messages(-1); /* flush chdir cache */ 823 if (pw != NULL && pw->pw_passwd != NULL) 824 memset(pw->pw_passwd, 0, strlen(pw->pw_passwd)); 825 pw = NULL; 826 logged_in = 0; 827 quietmessages = 0; 828 gidcount = 0; 829 curclass.type = CLASS_REAL; 830 (void) seteuid((uid_t)0); 831 } 832 833 void 834 pass(const char *passwd) 835 { 836 int rval; 837 const char *cp, *shell; 838 char *class, root[MAXPATHLEN]; 839 840 class = NULL; 841 if (logged_in || askpasswd == 0) { 842 reply(503, "Login with USER first."); 843 return; 844 } 845 askpasswd = 0; 846 if (curclass.type != CLASS_GUEST) { 847 /* "ftp" is the only account allowed with no password */ 848 if (pw == NULL) { 849 rval = 1; /* failure below */ 850 goto skip; 851 } 852 #if defined(KERBEROS) 853 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 854 rval = 0; 855 goto skip; 856 } 857 #endif 858 #if defined(KERBEROS5) 859 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 860 rval = 0; 861 goto skip; 862 } 863 #endif 864 #ifdef SKEY 865 if (skey_haskey(pw->pw_name) == 0) { 866 char *p; 867 int r; 868 869 p = xstrdup(passwd); 870 r = skey_passcheck(pw->pw_name, p); 871 free(p); 872 if (r != -1) { 873 rval = 0; 874 goto skip; 875 } 876 } 877 #endif 878 if (!sflag) 879 rval = checkpassword(pw, passwd); 880 else 881 rval = 1; 882 883 skip: 884 885 /* 886 * If rval > 0, the user failed the authentication check 887 * above. If rval == 0, either Kerberos or local 888 * authentication succeeded. 889 */ 890 if (rval) { 891 reply(530, "%s", rval == 2 ? "Password expired." : 892 "Login incorrect."); 893 if (logging) { 894 syslog(LOG_NOTICE, 895 "FTP LOGIN FAILED FROM %s", remotehost); 896 syslog(LOG_AUTHPRIV | LOG_NOTICE, 897 "FTP LOGIN FAILED FROM %s, %s", 898 remotehost, curname); 899 } 900 pw = NULL; 901 if (login_attempts++ >= 5) { 902 syslog(LOG_NOTICE, 903 "repeated login failures from %s", 904 remotehost); 905 exit(0); 906 } 907 return; 908 } 909 } 910 911 /* password ok; see if anything else prevents login */ 912 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 913 reply(530, "User %s may not use FTP.", pw->pw_name); 914 if (logging) 915 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 916 remotehost, pw->pw_name); 917 goto bad; 918 } 919 /* if not guest user, check for valid shell */ 920 if ((shell = pw->pw_shell) == NULL || *shell == 0) 921 shell = _PATH_BSHELL; 922 while ((cp = getusershell()) != NULL) 923 if (strcmp(cp, shell) == 0) 924 break; 925 endusershell(); 926 if (cp == NULL && curclass.type != CLASS_GUEST) { 927 reply(530, "User %s may not use FTP.", pw->pw_name); 928 if (logging) 929 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 930 remotehost, pw->pw_name); 931 goto bad; 932 } 933 934 login_attempts = 0; /* this time successful */ 935 if (setegid((gid_t)pw->pw_gid) < 0) { 936 reply(550, "Can't set gid."); 937 goto bad; 938 } 939 (void) initgroups(pw->pw_name, pw->pw_gid); 940 /* cache groups for cmds.c::matchgroup() */ 941 gidcount = getgroups(sizeof(gidlist), gidlist); 942 943 /* open wtmp before chroot */ 944 if (dowtmp) 945 logwtmp(ttyline, pw->pw_name, remotehost); 946 947 /* open utmp before chroot */ 948 if (doutmp) { 949 memset((void *)&utmp, 0, sizeof(utmp)); 950 (void)time(&utmp.ut_time); 951 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 952 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 953 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 954 login(&utmp); 955 } 956 957 logged_in = 1; 958 959 /* check user in /etc/ftpchroot */ 960 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 961 if (curclass.type == CLASS_GUEST) { 962 syslog(LOG_NOTICE, 963 "Can't change guest user to chroot class; remove entry in %s", 964 _PATH_FTPCHROOT); 965 exit(1); 966 } 967 curclass.type = CLASS_CHROOT; 968 } 969 if (class == NULL) { 970 switch (curclass.type) { 971 case CLASS_GUEST: 972 class = xstrdup("guest"); 973 break; 974 case CLASS_CHROOT: 975 class = xstrdup("chroot"); 976 break; 977 case CLASS_REAL: 978 class = xstrdup("real"); 979 break; 980 default: 981 syslog(LOG_ERR, "unknown curclass.type %d; aborting", 982 curclass.type); 983 abort(); 984 } 985 } 986 987 /* parse ftpd.conf, setting up various parameters */ 988 parse_conf(class); 989 connections = 1; 990 if (dopidfile) 991 count_users(); 992 if (curclass.limit != -1 && connections > curclass.limit) { 993 if (! EMPTYSTR(curclass.limitfile)) 994 (void)display_file(conffilename(curclass.limitfile), 995 530); 996 reply(530, 997 "User %s access denied, connection limit of %d reached.", 998 pw->pw_name, curclass.limit); 999 syslog(LOG_NOTICE, 1000 "Maximum connection limit of %d for class %s reached, login refused for %s", 1001 curclass.limit, curclass.classname, pw->pw_name); 1002 goto bad; 1003 } 1004 1005 homedir[0] = '/'; 1006 switch (curclass.type) { 1007 case CLASS_GUEST: 1008 /* 1009 * We MUST do a chdir() after the chroot. Otherwise 1010 * the old current directory will be accessible as "." 1011 * outside the new root! 1012 */ 1013 format_path(root, 1014 curclass.chroot ? curclass.chroot : 1015 anondir ? anondir : 1016 pw->pw_dir); 1017 format_path(homedir, 1018 curclass.homedir ? curclass.homedir : 1019 "/"); 1020 if (EMPTYSTR(homedir)) 1021 homedir[0] = '/'; 1022 if (EMPTYSTR(root) || chroot(root) < 0) { 1023 syslog(LOG_NOTICE, 1024 "GUEST user %s: can't chroot to %s: %m", 1025 pw->pw_name, root); 1026 goto bad_guest; 1027 } 1028 if (chdir(homedir) < 0) { 1029 syslog(LOG_NOTICE, 1030 "GUEST user %s: can't chdir to %s: %m", 1031 pw->pw_name, homedir); 1032 bad_guest: 1033 reply(550, "Can't set guest privileges."); 1034 goto bad; 1035 } 1036 break; 1037 case CLASS_CHROOT: 1038 format_path(root, 1039 curclass.chroot ? curclass.chroot : 1040 pw->pw_dir); 1041 format_path(homedir, 1042 curclass.homedir ? curclass.homedir : 1043 "/"); 1044 if (EMPTYSTR(homedir)) 1045 homedir[0] = '/'; 1046 if (EMPTYSTR(root) || chroot(root) < 0) { 1047 syslog(LOG_NOTICE, 1048 "CHROOT user %s: can't chroot to %s: %m", 1049 pw->pw_name, root); 1050 goto bad_chroot; 1051 } 1052 if (chdir(homedir) < 0) { 1053 syslog(LOG_NOTICE, 1054 "CHROOT user %s: can't chdir to %s: %m", 1055 pw->pw_name, homedir); 1056 bad_chroot: 1057 reply(550, "Can't change root."); 1058 goto bad; 1059 } 1060 break; 1061 case CLASS_REAL: 1062 /* only chroot REAL if explictly requested */ 1063 if (! EMPTYSTR(curclass.chroot)) { 1064 format_path(root, curclass.chroot); 1065 if (EMPTYSTR(root) || chroot(root) < 0) { 1066 syslog(LOG_NOTICE, 1067 "REAL user %s: can't chroot to %s: %m", 1068 pw->pw_name, root); 1069 goto bad_chroot; 1070 } 1071 } 1072 format_path(homedir, 1073 curclass.homedir ? curclass.homedir : 1074 pw->pw_dir); 1075 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1076 if (chdir("/") < 0) { 1077 syslog(LOG_NOTICE, 1078 "REAL user %s: can't chdir to %s: %m", 1079 pw->pw_name, 1080 !EMPTYSTR(homedir) ? homedir : "/"); 1081 reply(530, 1082 "User %s: can't change directory to %s.", 1083 pw->pw_name, 1084 !EMPTYSTR(homedir) ? homedir : "/"); 1085 goto bad; 1086 } else { 1087 reply(-230, 1088 "No directory! Logging in with home=/"); 1089 homedir[0] = '/'; 1090 } 1091 } 1092 break; 1093 } 1094 setlogin(pw->pw_name); 1095 if (dropprivs || 1096 (curclass.type != CLASS_REAL && 1097 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1098 dropprivs++; 1099 if (setgid((gid_t)pw->pw_gid) < 0) { 1100 reply(550, "Can't set gid."); 1101 goto bad; 1102 } 1103 if (setuid((uid_t)pw->pw_uid) < 0) { 1104 reply(550, "Can't set uid."); 1105 goto bad; 1106 } 1107 } else { 1108 if (seteuid((uid_t)pw->pw_uid) < 0) { 1109 reply(550, "Can't set uid."); 1110 goto bad; 1111 } 1112 } 1113 setenv("HOME", homedir, 1); 1114 1115 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1116 quietmessages = 1; 1117 1118 /* 1119 * Display a login message, if it exists. 1120 * N.B. reply(230,) must follow the message. 1121 */ 1122 (void)display_file(conffilename(curclass.motd), 230); 1123 show_chdir_messages(230); 1124 if (curclass.type == CLASS_GUEST) { 1125 char *p; 1126 1127 reply(230, "Guest login ok, access restrictions apply."); 1128 #if HAVE_SETPROCTITLE 1129 snprintf(proctitle, sizeof(proctitle), 1130 "%s: anonymous/%.*s", remotehost, 1131 (int) (sizeof(proctitle) - sizeof(remotehost) - 1132 sizeof(": anonymous/")), passwd); 1133 setproctitle("%s", proctitle); 1134 #endif /* HAVE_SETPROCTITLE */ 1135 if (logging) 1136 syslog(LOG_INFO, 1137 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1138 remotehost, passwd, 1139 curclass.classname, CURCLASSTYPE); 1140 /* store guest password reply into pw_passwd */ 1141 REASSIGN(pw->pw_passwd, xstrdup(passwd)); 1142 for (p = pw->pw_passwd; *p; p++) 1143 if (!isgraph(*p)) 1144 *p = '_'; 1145 } else { 1146 reply(230, "User %s logged in.", pw->pw_name); 1147 #if HAVE_SETPROCTITLE 1148 snprintf(proctitle, sizeof(proctitle), 1149 "%s: %s", remotehost, pw->pw_name); 1150 setproctitle("%s", proctitle); 1151 #endif /* HAVE_SETPROCTITLE */ 1152 if (logging) 1153 syslog(LOG_INFO, 1154 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1155 remotehost, pw->pw_name, 1156 curclass.classname, CURCLASSTYPE); 1157 } 1158 (void) umask(curclass.umask); 1159 goto cleanuppass; 1160 1161 bad: 1162 /* Forget all about it... */ 1163 end_login(); 1164 1165 cleanuppass: 1166 if (class) 1167 free(class); 1168 } 1169 1170 void 1171 retrieve(char *argv[], const char *name) 1172 { 1173 FILE *fin, *dout; 1174 struct stat st; 1175 int (*closefunc)(FILE *) = NULL; 1176 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1177 struct timeval start, finish, td, *tdp; 1178 const char *dispname; 1179 1180 sendrv = closerv = stderrfd = -1; 1181 isconversion = isdata = isls = log = 0; 1182 tdp = NULL; 1183 dispname = name; 1184 fin = dout = NULL; 1185 if (argv == NULL) { /* if not running a command ... */ 1186 log = 1; 1187 isdata = 1; 1188 fin = fopen(name, "r"); 1189 closefunc = fclose; 1190 if (fin == NULL) /* doesn't exist?; try a conversion */ 1191 argv = do_conversion(name); 1192 if (argv != NULL) { 1193 isconversion++; 1194 syslog(LOG_DEBUG, "get command: '%s' on '%s'", 1195 argv[0], name); 1196 } 1197 } 1198 if (argv != NULL) { 1199 char temp[MAXPATHLEN]; 1200 1201 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1202 isls = 1; 1203 stderrfd = -1; 1204 } else { 1205 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1206 stderrfd = mkstemp(temp); 1207 if (stderrfd != -1) 1208 (void)unlink(temp); 1209 } 1210 dispname = argv[0]; 1211 fin = ftpd_popen(argv, "r", stderrfd); 1212 closefunc = ftpd_pclose; 1213 st.st_size = -1; 1214 st.st_blksize = BUFSIZ; 1215 } 1216 if (fin == NULL) { 1217 if (errno != 0) { 1218 perror_reply(550, dispname); 1219 if (log) 1220 logxfer("get", -1, name, NULL, NULL, 1221 strerror(errno)); 1222 } 1223 goto cleanupretrieve; 1224 } 1225 byte_count = -1; 1226 if (argv == NULL 1227 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1228 reply(550, "%s: not a plain file.", dispname); 1229 goto done; 1230 } 1231 if (restart_point) { 1232 if (type == TYPE_A) { 1233 off_t i; 1234 int c; 1235 1236 for (i = 0; i < restart_point; i++) { 1237 if ((c=getc(fin)) == EOF) { 1238 perror_reply(550, dispname); 1239 goto done; 1240 } 1241 if (c == '\n') 1242 i++; 1243 } 1244 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1245 perror_reply(550, dispname); 1246 goto done; 1247 } 1248 } 1249 dout = dataconn(dispname, st.st_size, "w"); 1250 if (dout == NULL) 1251 goto done; 1252 1253 (void)gettimeofday(&start, NULL); 1254 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1255 (void)gettimeofday(&finish, NULL); 1256 (void) fclose(dout); /* close now to affect timing stats */ 1257 dout = NULL; 1258 timersub(&finish, &start, &td); 1259 tdp = &td; 1260 done: 1261 if (log) 1262 logxfer("get", byte_count, name, NULL, tdp, NULL); 1263 closerv = (*closefunc)(fin); 1264 if (sendrv == 0) { 1265 FILE *err; 1266 struct stat sb; 1267 1268 if (!isls && argv != NULL && closerv != 0) { 1269 reply(-226, 1270 "Command returned an exit status of %d", 1271 closerv); 1272 if (isconversion) 1273 syslog(LOG_WARNING, 1274 "retrieve command: '%s' returned %d", 1275 argv[0], closerv); 1276 } 1277 if (!isls && argv != NULL && stderrfd != -1 && 1278 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1279 ((err = fdopen(stderrfd, "r")) != NULL)) { 1280 char *cp, line[LINE_MAX]; 1281 1282 reply(-226, "Command error messages:"); 1283 rewind(err); 1284 while (fgets(line, sizeof(line), err) != NULL) { 1285 if ((cp = strchr(line, '\n')) != NULL) 1286 *cp = '\0'; 1287 reply(0, " %s", line); 1288 } 1289 (void) fflush(stdout); 1290 (void) fclose(err); 1291 /* a reply(226,) must follow */ 1292 } 1293 reply(226, "Transfer complete."); 1294 } 1295 cleanupretrieve: 1296 closedataconn(dout); 1297 if (stderrfd != -1) 1298 (void)close(stderrfd); 1299 if (isconversion) 1300 free(argv); 1301 } 1302 1303 void 1304 store(const char *name, const char *mode, int unique) 1305 { 1306 FILE *fout, *din; 1307 struct stat st; 1308 int (*closefunc)(FILE *); 1309 struct timeval start, finish, td, *tdp; 1310 char *desc; 1311 1312 din = NULL; 1313 desc = (*mode == 'w') ? "put" : "append"; 1314 if (unique && stat(name, &st) == 0 && 1315 (name = gunique(name)) == NULL) { 1316 logxfer(desc, -1, name, NULL, NULL, 1317 "cannot create unique file"); 1318 goto cleanupstore; 1319 } 1320 1321 if (restart_point) 1322 mode = "r+"; 1323 fout = fopen(name, mode); 1324 closefunc = fclose; 1325 tdp = NULL; 1326 if (fout == NULL) { 1327 perror_reply(553, name); 1328 logxfer(desc, -1, name, NULL, NULL, strerror(errno)); 1329 goto cleanupstore; 1330 } 1331 byte_count = -1; 1332 if (restart_point) { 1333 if (type == TYPE_A) { 1334 off_t i; 1335 int c; 1336 1337 for (i = 0; i < restart_point; i++) { 1338 if ((c=getc(fout)) == EOF) { 1339 perror_reply(550, name); 1340 goto done; 1341 } 1342 if (c == '\n') 1343 i++; 1344 } 1345 /* 1346 * We must do this seek to "current" position 1347 * because we are changing from reading to 1348 * writing. 1349 */ 1350 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1351 perror_reply(550, name); 1352 goto done; 1353 } 1354 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1355 perror_reply(550, name); 1356 goto done; 1357 } 1358 } 1359 din = dataconn(name, (off_t)-1, "r"); 1360 if (din == NULL) 1361 goto done; 1362 (void)gettimeofday(&start, NULL); 1363 if (receive_data(din, fout) == 0) { 1364 if (unique) 1365 reply(226, "Transfer complete (unique file name:%s).", 1366 name); 1367 else 1368 reply(226, "Transfer complete."); 1369 } 1370 (void)gettimeofday(&finish, NULL); 1371 (void) fclose(din); /* close now to affect timing stats */ 1372 din = NULL; 1373 timersub(&finish, &start, &td); 1374 tdp = &td; 1375 done: 1376 logxfer(desc, byte_count, name, NULL, tdp, NULL); 1377 (*closefunc)(fout); 1378 cleanupstore: 1379 closedataconn(din); 1380 } 1381 1382 static FILE * 1383 getdatasock(const char *mode) 1384 { 1385 int on, s, t, tries; 1386 in_port_t port; 1387 1388 on = 1; 1389 if (data >= 0) 1390 return (fdopen(data, mode)); 1391 if (! dropprivs) 1392 (void) seteuid((uid_t)0); 1393 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1394 if (s < 0) 1395 goto bad; 1396 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1397 (char *) &on, sizeof(on)) < 0) 1398 goto bad; 1399 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1400 (char *) &on, sizeof(on)) < 0) 1401 goto bad; 1402 /* anchor socket to avoid multi-homing problems */ 1403 data_source = ctrl_addr; 1404 /* 1405 * By default source port for PORT connctions is 1406 * ctrlport-1 (see RFC959 section 5.2). 1407 * However, if privs have been dropped and that 1408 * would be < IPPORT_RESERVED, use a random port 1409 * instead. 1410 */ 1411 if (dataport) 1412 port = dataport; 1413 else 1414 port = ntohs(ctrl_addr.su_port) - 1; 1415 if (dropprivs && port < IPPORT_RESERVED) 1416 port = 0; /* use random port */ 1417 data_source.su_port = htons(port); 1418 1419 for (tries = 1; ; tries++) { 1420 if (bind(s, (struct sockaddr *)&data_source.si_su, 1421 data_source.su_len) >= 0) 1422 break; 1423 if (errno != EADDRINUSE || tries > 10) 1424 goto bad; 1425 sleep(tries); 1426 } 1427 if (! dropprivs) 1428 (void) seteuid((uid_t)pw->pw_uid); 1429 #ifdef IP_TOS 1430 if (!mapped && ctrl_addr.su_family == AF_INET) { 1431 on = IPTOS_THROUGHPUT; 1432 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1433 sizeof(int)) < 0) 1434 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1435 } 1436 #endif 1437 return (fdopen(s, mode)); 1438 bad: 1439 /* Return the real value of errno (close may change it) */ 1440 t = errno; 1441 if (! dropprivs) 1442 (void) seteuid((uid_t)pw->pw_uid); 1443 (void) close(s); 1444 errno = t; 1445 return (NULL); 1446 } 1447 1448 FILE * 1449 dataconn(const char *name, off_t size, const char *mode) 1450 { 1451 char sizebuf[32]; 1452 FILE *file; 1453 int retry = 0, tos, keepalive; 1454 1455 file_size = size; 1456 byte_count = 0; 1457 if (size != (off_t) -1) 1458 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1459 (LLT)size, PLURAL(size)); 1460 else 1461 sizebuf[0] = '\0'; 1462 if (pdata >= 0) { 1463 struct sockinet from; 1464 int s, fromlen = sizeof(from.su_len); 1465 1466 (void) alarm(curclass.timeout); 1467 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 1468 (void) alarm(0); 1469 if (s < 0) { 1470 reply(425, "Can't open data connection."); 1471 (void) close(pdata); 1472 pdata = -1; 1473 return (NULL); 1474 } 1475 (void) close(pdata); 1476 pdata = s; 1477 switch (from.su_family) { 1478 case AF_INET: 1479 #ifdef IP_TOS 1480 if (!mapped) { 1481 tos = IPTOS_THROUGHPUT; 1482 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1483 (char *)&tos, sizeof(int)); 1484 } 1485 break; 1486 #endif 1487 } 1488 /* Set keepalives on the socket to detect dropped conns. */ 1489 #ifdef SO_KEEPALIVE 1490 keepalive = 1; 1491 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1492 (char *)&keepalive, sizeof(int)); 1493 #endif 1494 reply(150, "Opening %s mode data connection for '%s'%s.", 1495 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1496 return (fdopen(pdata, mode)); 1497 } 1498 if (data >= 0) { 1499 reply(125, "Using existing data connection for '%s'%s.", 1500 name, sizebuf); 1501 usedefault = 1; 1502 return (fdopen(data, mode)); 1503 } 1504 if (usedefault) 1505 data_dest = his_addr; 1506 usedefault = 1; 1507 file = getdatasock(mode); 1508 if (file == NULL) { 1509 char hbuf[NI_MAXHOST]; 1510 char pbuf[NI_MAXSERV]; 1511 1512 if (getnameinfo((struct sockaddr *)&data_source.si_su, 1513 data_source.su_len, hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1514 NI_NUMERICHOST | NI_NUMERICSERV)) 1515 strlcpy(hbuf, "?", sizeof(hbuf)); 1516 reply(425, "Can't create data socket (%s,%s): %s.", 1517 hbuf, pbuf, strerror(errno)); 1518 return (NULL); 1519 } 1520 data = fileno(file); 1521 while (connect(data, (struct sockaddr *)&data_dest.si_su, 1522 data_dest.su_len) < 0) { 1523 if (errno == EADDRINUSE && retry < swaitmax) { 1524 sleep((unsigned) swaitint); 1525 retry += swaitint; 1526 continue; 1527 } 1528 perror_reply(425, "Can't build data connection"); 1529 (void) fclose(file); 1530 data = -1; 1531 return (NULL); 1532 } 1533 reply(150, "Opening %s mode data connection for '%s'%s.", 1534 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1535 return (file); 1536 } 1537 1538 void 1539 closedataconn(FILE *fd) 1540 { 1541 1542 if (fd != NULL) 1543 (void)fclose(fd); 1544 data = -1; 1545 if (pdata >= 0) 1546 (void)close(pdata); 1547 pdata = -1; 1548 } 1549 1550 /* 1551 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1552 * encapsulation of the data subject * to Mode, Structure, and Type. 1553 * 1554 * NB: Form isn't handled. 1555 */ 1556 static int 1557 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1558 { 1559 int c, filefd, netfd, rval; 1560 char *buf; 1561 1562 transflag = 1; 1563 rval = -1; 1564 buf = NULL; 1565 if (setjmp(urgcatch)) 1566 goto cleanup_send_data; 1567 1568 switch (type) { 1569 1570 case TYPE_A: 1571 /* XXXLUKEM: rate limit ascii send (get) */ 1572 (void) alarm(curclass.timeout); 1573 while ((c = getc(instr)) != EOF) { 1574 byte_count++; 1575 if (c == '\n') { 1576 if (ferror(outstr)) 1577 goto data_err; 1578 (void) putc('\r', outstr); 1579 if (isdata) { 1580 total_data_out++; 1581 total_data++; 1582 } 1583 total_bytes_out++; 1584 total_bytes++; 1585 } 1586 (void) putc(c, outstr); 1587 if (isdata) { 1588 total_data_out++; 1589 total_data++; 1590 } 1591 total_bytes_out++; 1592 total_bytes++; 1593 if ((byte_count % 4096) == 0) 1594 (void) alarm(curclass.timeout); 1595 } 1596 (void) alarm(0); 1597 fflush(outstr); 1598 if (ferror(instr)) 1599 goto file_err; 1600 if (ferror(outstr)) 1601 goto data_err; 1602 rval = 0; 1603 goto cleanup_send_data; 1604 1605 case TYPE_I: 1606 case TYPE_L: 1607 if ((buf = malloc((size_t)blksize)) == NULL) { 1608 perror_reply(451, "Local resource failure: malloc"); 1609 goto cleanup_send_data; 1610 } 1611 filefd = fileno(instr); 1612 netfd = fileno(outstr); 1613 (void) alarm(curclass.timeout); 1614 if (curclass.rateget) { 1615 while (1) { 1616 int d; 1617 struct timeval then, now, td; 1618 off_t bufrem; 1619 char *bufp; 1620 1621 (void)gettimeofday(&then, NULL); 1622 errno = c = d = 0; 1623 bufrem = curclass.rateget; 1624 while (bufrem > 0) { 1625 if ((c = read(filefd, buf, 1626 MIN(blksize, bufrem))) <= 0) 1627 goto senddone; 1628 (void) alarm(curclass.timeout); 1629 bufrem -= c; 1630 byte_count += c; 1631 if (isdata) { 1632 total_data_out += c; 1633 total_data += c; 1634 } 1635 total_bytes_out += c; 1636 total_bytes += c; 1637 for (bufp = buf; c > 0; 1638 c -= d, bufp += d) 1639 if ((d = 1640 write(netfd, bufp, c)) <= 0) 1641 break; 1642 if (d < 0) 1643 goto data_err; 1644 } 1645 (void)gettimeofday(&now, NULL); 1646 timersub(&now, &then, &td); 1647 if (td.tv_sec == 0) 1648 usleep(1000000 - td.tv_usec); 1649 } 1650 } else { 1651 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1652 if (write(netfd, buf, c) != c) 1653 goto data_err; 1654 (void) alarm(curclass.timeout); 1655 byte_count += c; 1656 if (isdata) { 1657 total_data_out += c; 1658 total_data += c; 1659 } 1660 total_bytes_out += c; 1661 total_bytes += c; 1662 } 1663 } 1664 senddone: 1665 if (c < 0) 1666 goto file_err; 1667 rval = 0; 1668 goto cleanup_send_data; 1669 1670 default: 1671 reply(550, "Unimplemented TYPE %d in send_data", type); 1672 goto cleanup_send_data; 1673 } 1674 1675 data_err: 1676 (void) alarm(0); 1677 perror_reply(426, "Data connection"); 1678 goto cleanup_send_data; 1679 1680 file_err: 1681 (void) alarm(0); 1682 perror_reply(551, "Error on input file"); 1683 /* FALLTHROUGH */ 1684 1685 cleanup_send_data: 1686 (void) alarm(0); 1687 transflag = 0; 1688 if (buf) 1689 free(buf); 1690 if (isdata) { 1691 total_files_out++; 1692 total_files++; 1693 } 1694 total_xfers_out++; 1695 total_xfers++; 1696 return (rval); 1697 } 1698 1699 /* 1700 * Transfer data from peer to "outstr" using the appropriate encapulation of 1701 * the data subject to Mode, Structure, and Type. 1702 * 1703 * N.B.: Form isn't handled. 1704 */ 1705 static int 1706 receive_data(FILE *instr, FILE *outstr) 1707 { 1708 int c, bare_lfs, netfd, filefd, rval; 1709 off_t byteswritten; 1710 char buf[BUFSIZ]; 1711 #ifdef __GNUC__ 1712 (void) &bare_lfs; 1713 #endif 1714 1715 bare_lfs = 0; 1716 transflag = 1; 1717 rval = -1; 1718 byteswritten = 0; 1719 if (setjmp(urgcatch)) 1720 goto cleanup_recv_data; 1721 1722 #define FILESIZECHECK(x) \ 1723 do { \ 1724 if (curclass.maxfilesize != -1 && \ 1725 (x) > curclass.maxfilesize) { \ 1726 errno = EFBIG; \ 1727 goto file_err; \ 1728 } \ 1729 } while (0) 1730 1731 switch (type) { 1732 1733 case TYPE_I: 1734 case TYPE_L: 1735 netfd = fileno(instr); 1736 filefd = fileno(outstr); 1737 (void) alarm(curclass.timeout); 1738 if (curclass.rateput) { 1739 while (1) { 1740 int d; 1741 struct timeval then, now, td; 1742 off_t bufrem; 1743 1744 (void)gettimeofday(&then, NULL); 1745 errno = c = d = 0; 1746 for (bufrem = curclass.rateput; bufrem > 0; ) { 1747 if ((c = read(netfd, buf, 1748 MIN(sizeof(buf), bufrem))) <= 0) 1749 goto recvdone; 1750 FILESIZECHECK(byte_count + c); 1751 if ((d = write(filefd, buf, c)) != c) 1752 goto file_err; 1753 (void) alarm(curclass.timeout); 1754 bufrem -= c; 1755 byte_count += c; 1756 total_data_in += c; 1757 total_data += c; 1758 total_bytes_in += c; 1759 total_bytes += c; 1760 } 1761 (void)gettimeofday(&now, NULL); 1762 timersub(&now, &then, &td); 1763 if (td.tv_sec == 0) 1764 usleep(1000000 - td.tv_usec); 1765 } 1766 } else { 1767 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1768 FILESIZECHECK(byte_count + c); 1769 if (write(filefd, buf, c) != c) 1770 goto file_err; 1771 (void) alarm(curclass.timeout); 1772 byte_count += c; 1773 total_data_in += c; 1774 total_data += c; 1775 total_bytes_in += c; 1776 total_bytes += c; 1777 } 1778 } 1779 recvdone: 1780 if (c < 0) 1781 goto data_err; 1782 rval = 0; 1783 goto cleanup_recv_data; 1784 1785 case TYPE_E: 1786 reply(553, "TYPE E not implemented."); 1787 goto cleanup_recv_data; 1788 1789 case TYPE_A: 1790 (void) alarm(curclass.timeout); 1791 /* XXXLUKEM: rate limit ascii receive (put) */ 1792 while ((c = getc(instr)) != EOF) { 1793 byte_count++; 1794 total_data_in++; 1795 total_data++; 1796 total_bytes_in++; 1797 total_bytes++; 1798 if ((byte_count % 4096) == 0) 1799 (void) alarm(curclass.timeout); 1800 if (c == '\n') 1801 bare_lfs++; 1802 while (c == '\r') { 1803 if (ferror(outstr)) 1804 goto data_err; 1805 if ((c = getc(instr)) != '\n') { 1806 byte_count++; 1807 total_data_in++; 1808 total_data++; 1809 total_bytes_in++; 1810 total_bytes++; 1811 if ((byte_count % 4096) == 0) 1812 (void) alarm(curclass.timeout); 1813 byteswritten++; 1814 FILESIZECHECK(byteswritten); 1815 (void) putc ('\r', outstr); 1816 if (c == '\0' || c == EOF) 1817 goto contin2; 1818 } 1819 } 1820 byteswritten++; 1821 FILESIZECHECK(byteswritten); 1822 (void) putc(c, outstr); 1823 contin2: ; 1824 } 1825 (void) alarm(0); 1826 fflush(outstr); 1827 if (ferror(instr)) 1828 goto data_err; 1829 if (ferror(outstr)) 1830 goto file_err; 1831 if (bare_lfs) { 1832 reply(-226, 1833 "WARNING! %d bare linefeeds received in ASCII mode", 1834 bare_lfs); 1835 reply(0, "File may not have transferred correctly."); 1836 } 1837 rval = 0; 1838 goto cleanup_recv_data; 1839 1840 default: 1841 reply(550, "Unimplemented TYPE %d in receive_data", type); 1842 goto cleanup_recv_data; 1843 } 1844 #undef FILESIZECHECK(x) 1845 1846 data_err: 1847 (void) alarm(0); 1848 perror_reply(426, "Data Connection"); 1849 goto cleanup_recv_data; 1850 1851 file_err: 1852 (void) alarm(0); 1853 perror_reply(452, "Error writing file"); 1854 goto cleanup_recv_data; 1855 1856 cleanup_recv_data: 1857 (void) alarm(0); 1858 transflag = 0; 1859 total_files_in++; 1860 total_files++; 1861 total_xfers_in++; 1862 total_xfers++; 1863 return (rval); 1864 } 1865 1866 void 1867 statcmd(void) 1868 { 1869 struct sockinet *su = NULL; 1870 static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 1871 u_char *a, *p; 1872 int ispassive, af; 1873 off_t otbi, otbo, otb; 1874 1875 a = p = (u_char *)NULL; 1876 1877 reply(-211, "%s FTP server status:", hostname); 1878 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 1879 hbuf[0] = '\0'; 1880 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 1881 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) 1882 && strcmp(remotehost, hbuf) != 0) 1883 reply(0, "Connected to %s (%s)", remotehost, hbuf); 1884 else 1885 reply(0, "Connected to %s", remotehost); 1886 1887 if (logged_in) { 1888 if (curclass.type == CLASS_GUEST) 1889 reply(0, "Logged in anonymously"); 1890 else 1891 reply(0, "Logged in as %s%s", pw->pw_name, 1892 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1893 } else if (askpasswd) 1894 reply(0, "Waiting for password"); 1895 else 1896 reply(0, "Waiting for user name"); 1897 cprintf(stdout, " TYPE: %s", typenames[type]); 1898 if (type == TYPE_A || type == TYPE_E) 1899 cprintf(stdout, ", FORM: %s", formnames[form]); 1900 if (type == TYPE_L) { 1901 #if NBBY == 8 1902 cprintf(stdout, " %d", NBBY); 1903 #else 1904 /* XXX: `bytesize' needs to be defined in this case */ 1905 cprintf(stdout, " %d", bytesize); 1906 #endif 1907 } 1908 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 1909 strunames[stru], modenames[mode]); 1910 ispassive = 0; 1911 if (data != -1) { 1912 reply(0, "Data connection open"); 1913 su = NULL; 1914 } else if (pdata != -1) { 1915 reply(0, "in Passive mode"); 1916 if (curclass.advertise.su_len != 0) 1917 su = &curclass.advertise; 1918 else 1919 su = &pasv_addr; 1920 ispassive = 1; 1921 goto printaddr; 1922 } else if (usedefault == 0) { 1923 if (epsvall) { 1924 reply(0, "EPSV only mode (EPSV ALL)"); 1925 goto epsvonly; 1926 } 1927 su = (struct sockinet *)&data_dest; 1928 printaddr: 1929 /* PASV/PORT */ 1930 if (su->su_family == AF_INET) { 1931 a = (u_char *) &su->su_addr; 1932 p = (u_char *) &su->su_port; 1933 #define UC(b) (((int) b) & 0xff) 1934 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 1935 ispassive ? "PASV" : "PORT" , 1936 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1937 UC(p[0]), UC(p[1])); 1938 } 1939 1940 /* LPSV/LPRT */ 1941 { 1942 int alen, af, i; 1943 1944 alen = 0; 1945 switch (su->su_family) { 1946 case AF_INET: 1947 a = (u_char *) &su->su_addr; 1948 p = (u_char *) &su->su_port; 1949 alen = sizeof(su->su_addr); 1950 af = 4; 1951 break; 1952 #ifdef INET6 1953 case AF_INET6: 1954 a = (u_char *) &su->su_6addr; 1955 p = (u_char *) &su->su_port; 1956 alen = sizeof(su->su_6addr); 1957 af = 6; 1958 break; 1959 #endif 1960 default: 1961 af = 0; 1962 break; 1963 } 1964 if (af) { 1965 cprintf(stdout, " %s (%d,%d", 1966 ispassive ? "LPSV" : "LPRT", af, alen); 1967 for (i = 0; i < alen; i++) 1968 cprintf(stdout, ",%d", UC(a[i])); 1969 cprintf(stdout, ",%d,%d,%d)\r\n", 1970 2, UC(p[0]), UC(p[1])); 1971 #undef UC 1972 } 1973 } 1974 1975 /* EPRT/EPSV */ 1976 epsvonly: 1977 af = af2epsvproto(su->su_family); 1978 hbuf[0] = '\0'; 1979 if (af > 0) { 1980 struct sockinet tmp; 1981 1982 tmp = *su; 1983 #ifdef INET6 1984 if (tmp.su_family == AF_INET6) 1985 tmp.su_scope_id = 0; 1986 #endif 1987 if (getnameinfo((struct sockaddr *)&tmp.si_su, 1988 tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 1989 NI_NUMERICHOST | NI_NUMERICSERV) == 0) 1990 reply(0, "%s (|%d|%s|%s|)", 1991 ispassive ? "EPSV" : "EPRT", 1992 af, hbuf, sbuf); 1993 } 1994 } else 1995 reply(0, "No data connection"); 1996 1997 if (logged_in) { 1998 reply(0, 1999 "Data sent: " LLF " byte%s in " LLF " file%s", 2000 (LLT)total_data_out, PLURAL(total_data_out), 2001 (LLT)total_files_out, PLURAL(total_files_out)); 2002 reply(0, 2003 "Data received: " LLF " byte%s in " LLF " file%s", 2004 (LLT)total_data_in, PLURAL(total_data_in), 2005 (LLT)total_files_in, PLURAL(total_files_in)); 2006 reply(0, 2007 "Total data: " LLF " byte%s in " LLF " file%s", 2008 (LLT)total_data, PLURAL(total_data), 2009 (LLT)total_files, PLURAL(total_files)); 2010 } 2011 otbi = total_bytes_in; 2012 otbo = total_bytes_out; 2013 otb = total_bytes; 2014 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 2015 (LLT)otbo, PLURAL(otbo), 2016 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 2017 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 2018 (LLT)otbi, PLURAL(otbi), 2019 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 2020 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 2021 (LLT)otb, PLURAL(otb), 2022 (LLT)total_xfers, PLURAL(total_xfers)); 2023 2024 if (logged_in) { 2025 struct ftpconv *cp; 2026 2027 reply(0, "%s", ""); 2028 reply(0, "Class: %s, type: %s", 2029 curclass.classname, CURCLASSTYPE); 2030 reply(0, "Check PORT/LPRT commands: %sabled", 2031 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 2032 if (! EMPTYSTR(curclass.display)) 2033 reply(0, "Display file: %s", curclass.display); 2034 if (! EMPTYSTR(curclass.notify)) 2035 reply(0, "Notify fileglob: %s", curclass.notify); 2036 reply(0, "Idle timeout: %d, maximum timeout: %d", 2037 curclass.timeout, curclass.maxtimeout); 2038 reply(0, "Current connections: %d", connections); 2039 if (curclass.limit == -1) 2040 reply(0, "Maximum connections: unlimited"); 2041 else 2042 reply(0, "Maximum connections: %d", curclass.limit); 2043 if (curclass.limitfile) 2044 reply(0, "Connection limit exceeded message file: %s", 2045 curclass.limitfile); 2046 if (! EMPTYSTR(curclass.chroot)) 2047 reply(0, "Chroot format: %s", curclass.chroot); 2048 if (! EMPTYSTR(curclass.homedir)) 2049 reply(0, "Homedir format: %s", curclass.homedir); 2050 if (curclass.maxfilesize == -1) 2051 reply(0, "Maximum file size: unlimited"); 2052 else 2053 reply(0, "Maximum file size: " LLF, 2054 (LLT)curclass.maxfilesize); 2055 if (! EMPTYSTR(curclass.motd)) 2056 reply(0, "MotD file: %s", curclass.motd); 2057 reply(0, 2058 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2059 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2060 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2061 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2062 reply(0, "Sanitize file names: %sabled", 2063 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2064 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2065 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2066 if (curclass.advertise.su_len != 0) { 2067 char buf[50]; /* big enough for IPv6 address */ 2068 const char *bp; 2069 2070 bp = inet_ntop(curclass.advertise.su_family, 2071 (void *)&curclass.advertise.su_addr, 2072 buf, sizeof(buf)); 2073 if (bp != NULL) 2074 reply(0, "PASV advertise address: %s", bp); 2075 } 2076 if (curclass.portmin && curclass.portmax) 2077 reply(0, "PASV port range: %d - %d", 2078 curclass.portmin, curclass.portmax); 2079 if (curclass.rateget) 2080 reply(0, "Rate get limit: " LLF " bytes/sec", 2081 (LLT)curclass.rateget); 2082 else 2083 reply(0, "Rate get limit: disabled"); 2084 if (curclass.rateput) 2085 reply(0, "Rate put limit: " LLF " bytes/sec", 2086 (LLT)curclass.rateput); 2087 else 2088 reply(0, "Rate put limit: disabled"); 2089 reply(0, "Umask: %.04o", curclass.umask); 2090 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2091 if (cp->suffix == NULL || cp->types == NULL || 2092 cp->command == NULL) 2093 continue; 2094 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2095 cp->suffix, cp->types, cp->disable, cp->command); 2096 } 2097 } 2098 2099 reply(211, "End of status"); 2100 } 2101 2102 void 2103 fatal(const char *s) 2104 { 2105 2106 reply(451, "Error in server: %s\n", s); 2107 reply(221, "Closing connection due to server error."); 2108 dologout(0); 2109 /* NOTREACHED */ 2110 } 2111 2112 /* 2113 * reply() -- 2114 * depending on the value of n, display fmt with a trailing CRLF and 2115 * prefix of: 2116 * n < -1 prefix the message with abs(n) + "-" (initial line) 2117 * n == 0 prefix the message with 4 spaces (middle lines) 2118 * n > 0 prefix the message with n + " " (final line) 2119 */ 2120 void 2121 reply(int n, const char *fmt, ...) 2122 { 2123 off_t b; 2124 va_list ap; 2125 2126 va_start(ap, fmt); 2127 b = 0; 2128 if (n == 0) 2129 cprintf(stdout, " "); 2130 else if (n < 0) 2131 cprintf(stdout, "%d-", -n); 2132 else 2133 cprintf(stdout, "%d ", n); 2134 b = vprintf(fmt, ap); 2135 total_bytes += b; 2136 total_bytes_out += b; 2137 cprintf(stdout, "\r\n"); 2138 (void)fflush(stdout); 2139 if (debug) { 2140 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 2141 vsyslog(LOG_DEBUG, fmt, ap); 2142 } 2143 } 2144 2145 static void 2146 logremotehost(struct sockinet *who) 2147 { 2148 2149 if (getnameinfo((struct sockaddr *)&who->si_su, 2150 who->su_len, remotehost, sizeof(remotehost), NULL, 0, 0)) 2151 strlcpy(remotehost, "?", sizeof(remotehost)); 2152 2153 #if HAVE_SETPROCTITLE 2154 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2155 setproctitle("%s", proctitle); 2156 #endif /* HAVE_SETPROCTITLE */ 2157 if (logging) 2158 syslog(LOG_INFO, "connection from %s to %s", 2159 remotehost, hostname); 2160 } 2161 2162 /* 2163 * Record logout in wtmp file and exit with supplied status. 2164 */ 2165 void 2166 dologout(int status) 2167 { 2168 /* 2169 * Prevent reception of SIGURG from resulting in a resumption 2170 * back to the main program loop. 2171 */ 2172 transflag = 0; 2173 2174 if (logged_in) { 2175 if (dowtmp) 2176 logwtmp(ttyline, "", ""); 2177 if (doutmp) 2178 logout(utmp.ut_line); 2179 #ifdef KERBEROS 2180 if (!notickets && krbtkfile_env) 2181 unlink(krbtkfile_env); 2182 #endif 2183 } 2184 /* beware of flushing buffers after a SIGPIPE */ 2185 _exit(status); 2186 } 2187 2188 static void 2189 myoob(int signo) 2190 { 2191 char *cp; 2192 2193 /* only process if transfer occurring */ 2194 if (!transflag) 2195 return; 2196 cp = tmpline; 2197 if (getline(cp, 7, stdin) == NULL) { 2198 reply(221, "You could at least say goodbye."); 2199 dologout(0); 2200 } 2201 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2202 tmpline[0] = '\0'; 2203 reply(426, "Transfer aborted. Data connection closed."); 2204 reply(226, "Abort successful"); 2205 longjmp(urgcatch, 1); 2206 } 2207 if (strcasecmp(cp, "STAT\r\n") == 0) { 2208 tmpline[0] = '\0'; 2209 if (file_size != (off_t) -1) 2210 reply(213, 2211 "Status: " LLF " of " LLF " byte%s transferred", 2212 (LLT)byte_count, (LLT)file_size, 2213 PLURAL(byte_count)); 2214 else 2215 reply(213, "Status: " LLF " byte%s transferred", 2216 (LLT)byte_count, PLURAL(byte_count)); 2217 } 2218 } 2219 2220 static int 2221 bind_pasv_addr(void) 2222 { 2223 static int passiveport; 2224 int port, len; 2225 2226 len = pasv_addr.su_len; 2227 if (curclass.portmin == 0 && curclass.portmax == 0) { 2228 pasv_addr.su_port = 0; 2229 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2230 } 2231 2232 if (passiveport == 0) { 2233 srand(getpid()); 2234 passiveport = rand() % (curclass.portmax - curclass.portmin) 2235 + curclass.portmin; 2236 } 2237 2238 port = passiveport; 2239 while (1) { 2240 port++; 2241 if (port > curclass.portmax) 2242 port = curclass.portmin; 2243 else if (port == passiveport) { 2244 errno = EAGAIN; 2245 return (-1); 2246 } 2247 pasv_addr.su_port = htons(port); 2248 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 2249 break; 2250 if (errno != EADDRINUSE) 2251 return (-1); 2252 } 2253 passiveport = port; 2254 return (0); 2255 } 2256 2257 /* 2258 * Note: a response of 425 is not mentioned as a possible response to 2259 * the PASV command in RFC959. However, it has been blessed as 2260 * a legitimate response by Jon Postel in a telephone conversation 2261 * with Rick Adams on 25 Jan 89. 2262 */ 2263 void 2264 passive(void) 2265 { 2266 int len; 2267 char *p, *a; 2268 2269 if (pdata >= 0) 2270 close(pdata); 2271 pdata = socket(AF_INET, SOCK_STREAM, 0); 2272 if (pdata < 0 || !logged_in) { 2273 perror_reply(425, "Can't open passive connection"); 2274 return; 2275 } 2276 pasv_addr = ctrl_addr; 2277 2278 if (bind_pasv_addr() < 0) 2279 goto pasv_error; 2280 len = pasv_addr.su_len; 2281 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2282 goto pasv_error; 2283 pasv_addr.su_len = len; 2284 if (listen(pdata, 1) < 0) 2285 goto pasv_error; 2286 if (curclass.advertise.su_len != 0) 2287 a = (char *) &curclass.advertise.su_addr; 2288 else 2289 a = (char *) &pasv_addr.su_addr; 2290 p = (char *) &pasv_addr.su_port; 2291 2292 #define UC(b) (((int) b) & 0xff) 2293 2294 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2295 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2296 return; 2297 2298 pasv_error: 2299 (void) close(pdata); 2300 pdata = -1; 2301 perror_reply(425, "Can't open passive connection"); 2302 return; 2303 } 2304 2305 /* 2306 * convert protocol identifier to/from AF 2307 */ 2308 int 2309 lpsvproto2af(int proto) 2310 { 2311 2312 switch (proto) { 2313 case 4: 2314 return AF_INET; 2315 #ifdef INET6 2316 case 6: 2317 return AF_INET6; 2318 #endif 2319 default: 2320 return -1; 2321 } 2322 } 2323 2324 int 2325 af2lpsvproto(int af) 2326 { 2327 2328 switch (af) { 2329 case AF_INET: 2330 return 4; 2331 #ifdef INET6 2332 case AF_INET6: 2333 return 6; 2334 #endif 2335 default: 2336 return -1; 2337 } 2338 } 2339 2340 int 2341 epsvproto2af(int proto) 2342 { 2343 2344 switch (proto) { 2345 case 1: 2346 return AF_INET; 2347 #ifdef INET6 2348 case 2: 2349 return AF_INET6; 2350 #endif 2351 default: 2352 return -1; 2353 } 2354 } 2355 2356 int 2357 af2epsvproto(int af) 2358 { 2359 2360 switch (af) { 2361 case AF_INET: 2362 return 1; 2363 #ifdef INET6 2364 case AF_INET6: 2365 return 2; 2366 #endif 2367 default: 2368 return -1; 2369 } 2370 } 2371 2372 /* 2373 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2374 * 229 Entering Extended Passive Mode (|||port|) 2375 */ 2376 void 2377 long_passive(char *cmd, int pf) 2378 { 2379 int len; 2380 char *p, *a; 2381 2382 if (!logged_in) { 2383 syslog(LOG_NOTICE, "long passive but not logged in"); 2384 reply(503, "Login with USER first."); 2385 return; 2386 } 2387 2388 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2389 /* 2390 * XXX: only EPRT/EPSV ready clients will understand this 2391 */ 2392 if (strcmp(cmd, "EPSV") != 0) 2393 reply(501, "Network protocol mismatch"); /*XXX*/ 2394 else 2395 epsv_protounsupp("Network protocol mismatch"); 2396 2397 return; 2398 } 2399 2400 if (pdata >= 0) 2401 close(pdata); 2402 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2403 if (pdata < 0) { 2404 perror_reply(425, "Can't open passive connection"); 2405 return; 2406 } 2407 pasv_addr = ctrl_addr; 2408 if (bind_pasv_addr() < 0) 2409 goto pasv_error; 2410 len = pasv_addr.su_len; 2411 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2412 goto pasv_error; 2413 pasv_addr.su_len = len; 2414 if (listen(pdata, 1) < 0) 2415 goto pasv_error; 2416 p = (char *) &pasv_addr.su_port; 2417 2418 #define UC(b) (((int) b) & 0xff) 2419 2420 if (strcmp(cmd, "LPSV") == 0) { 2421 struct sockinet *advert; 2422 2423 if (curclass.advertise.su_len != 0) 2424 advert = &curclass.advertise; 2425 else 2426 advert = &pasv_addr; 2427 switch (advert->su_family) { 2428 case AF_INET: 2429 a = (char *) &advert->su_addr; 2430 reply(228, 2431 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2432 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2433 2, UC(p[0]), UC(p[1])); 2434 return; 2435 #ifdef INET6 2436 case AF_INET6: 2437 a = (char *) &advert->su_6addr; 2438 reply(228, 2439 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2440 6, 16, 2441 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2442 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2443 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2444 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2445 2, UC(p[0]), UC(p[1])); 2446 return; 2447 #endif 2448 } 2449 #undef UC 2450 } else if (strcmp(cmd, "EPSV") == 0) { 2451 switch (pasv_addr.su_family) { 2452 case AF_INET: 2453 #ifdef INET6 2454 case AF_INET6: 2455 #endif 2456 reply(229, "Entering Extended Passive Mode (|||%d|)", 2457 ntohs(pasv_addr.su_port)); 2458 return; 2459 } 2460 } else { 2461 /* more proper error code? */ 2462 } 2463 2464 pasv_error: 2465 (void) close(pdata); 2466 pdata = -1; 2467 perror_reply(425, "Can't open passive connection"); 2468 return; 2469 } 2470 2471 int 2472 extended_port(const char *arg) 2473 { 2474 char *tmp = NULL; 2475 char *result[3]; 2476 char *p, *q; 2477 char delim; 2478 struct addrinfo hints; 2479 struct addrinfo *res = NULL; 2480 int i; 2481 unsigned long proto; 2482 2483 tmp = xstrdup(arg); 2484 p = tmp; 2485 delim = p[0]; 2486 p++; 2487 memset(result, 0, sizeof(result)); 2488 for (i = 0; i < 3; i++) { 2489 q = strchr(p, delim); 2490 if (!q || *q != delim) 2491 goto parsefail; 2492 *q++ = '\0'; 2493 result[i] = p; 2494 p = q; 2495 } 2496 2497 /* some more sanity checks */ 2498 p = NULL; 2499 (void)strtoul(result[2], &p, 10); 2500 if (!*result[2] || *p) 2501 goto parsefail; 2502 p = NULL; 2503 proto = strtoul(result[0], &p, 10); 2504 if (!*result[0] || *p) 2505 goto protounsupp; 2506 2507 memset(&hints, 0, sizeof(hints)); 2508 hints.ai_family = epsvproto2af((int)proto); 2509 if (hints.ai_family < 0) 2510 goto protounsupp; 2511 hints.ai_socktype = SOCK_STREAM; 2512 hints.ai_flags = AI_NUMERICHOST; 2513 if (getaddrinfo(result[1], result[2], &hints, &res)) 2514 goto parsefail; 2515 if (res->ai_next) 2516 goto parsefail; 2517 if (sizeof(data_dest) < res->ai_addrlen) 2518 goto parsefail; 2519 memcpy(&data_dest.si_su, res->ai_addr, res->ai_addrlen); 2520 data_dest.su_len = res->ai_addrlen; 2521 #ifdef INET6 2522 if (his_addr.su_family == AF_INET6 && 2523 data_dest.su_family == AF_INET6) { 2524 /* XXX: more sanity checks! */ 2525 data_dest.su_scope_id = his_addr.su_scope_id; 2526 } 2527 #endif 2528 2529 if (tmp != NULL) 2530 free(tmp); 2531 if (res) 2532 freeaddrinfo(res); 2533 return 0; 2534 2535 parsefail: 2536 reply(500, "Invalid argument, rejected."); 2537 usedefault = 1; 2538 if (tmp != NULL) 2539 free(tmp); 2540 if (res) 2541 freeaddrinfo(res); 2542 return -1; 2543 2544 protounsupp: 2545 epsv_protounsupp("Protocol not supported"); 2546 usedefault = 1; 2547 if (tmp != NULL) 2548 free(tmp); 2549 if (res) 2550 freeaddrinfo(res); 2551 return -1; 2552 } 2553 2554 /* 2555 * 522 Protocol not supported (proto,...) 2556 * as we assume address family for control and data connections are the same, 2557 * we do not return the list of address families we support - instead, we 2558 * return the address family of the control connection. 2559 */ 2560 void 2561 epsv_protounsupp(const char *message) 2562 { 2563 int proto; 2564 2565 proto = af2epsvproto(ctrl_addr.su_family); 2566 if (proto < 0) 2567 reply(501, "%s", message); /* XXX */ 2568 else 2569 reply(522, "%s, use (%d)", message, proto); 2570 } 2571 2572 /* 2573 * Generate unique name for file with basename "local". 2574 * The file named "local" is already known to exist. 2575 * Generates failure reply on error. 2576 * 2577 * XXX: this function should under go changes similar to 2578 * the mktemp(3)/mkstemp(3) changes. 2579 */ 2580 static char * 2581 gunique(const char *local) 2582 { 2583 static char new[MAXPATHLEN]; 2584 struct stat st; 2585 char *cp; 2586 int count; 2587 2588 cp = strrchr(local, '/'); 2589 if (cp) 2590 *cp = '\0'; 2591 if (stat(cp ? local : ".", &st) < 0) { 2592 perror_reply(553, cp ? local : "."); 2593 return (NULL); 2594 } 2595 if (cp) 2596 *cp = '/'; 2597 for (count = 1; count < 100; count++) { 2598 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2599 if (stat(new, &st) < 0) 2600 return (new); 2601 } 2602 reply(452, "Unique file name cannot be created."); 2603 return (NULL); 2604 } 2605 2606 /* 2607 * Format and send reply containing system error number. 2608 */ 2609 void 2610 perror_reply(int code, const char *string) 2611 { 2612 int save_errno; 2613 2614 save_errno = errno; 2615 reply(code, "%s: %s.", string, strerror(errno)); 2616 errno = save_errno; 2617 } 2618 2619 static char *onefile[] = { 2620 "", 2621 0 2622 }; 2623 2624 void 2625 send_file_list(const char *whichf) 2626 { 2627 struct stat st; 2628 DIR *dirp = NULL; 2629 struct dirent *dir; 2630 FILE *dout = NULL; 2631 char **dirlist, *dirname, *p; 2632 int simple = 0; 2633 int freeglob = 0; 2634 glob_t gl; 2635 2636 #ifdef __GNUC__ 2637 (void) &dout; 2638 (void) &dirlist; 2639 (void) &simple; 2640 (void) &freeglob; 2641 #endif 2642 2643 p = NULL; 2644 if (strpbrk(whichf, "~{[*?") != NULL) { 2645 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2646 2647 memset(&gl, 0, sizeof(gl)); 2648 freeglob = 1; 2649 if (glob(whichf, flags, 0, &gl)) { 2650 reply(550, "not found"); 2651 goto out; 2652 } else if (gl.gl_pathc == 0) { 2653 errno = ENOENT; 2654 perror_reply(550, whichf); 2655 goto out; 2656 } 2657 dirlist = gl.gl_pathv; 2658 } else { 2659 p = xstrdup(whichf); 2660 onefile[0] = p; 2661 dirlist = onefile; 2662 simple = 1; 2663 } 2664 /* XXX: } for vi sm */ 2665 2666 if (setjmp(urgcatch)) { 2667 transflag = 0; 2668 goto out; 2669 } 2670 while ((dirname = *dirlist++) != NULL) { 2671 int trailingslash = 0; 2672 2673 if (stat(dirname, &st) < 0) { 2674 /* 2675 * If user typed "ls -l", etc, and the client 2676 * used NLST, do what the user meant. 2677 */ 2678 /* XXX: nuke this support? */ 2679 if (dirname[0] == '-' && *dirlist == NULL && 2680 transflag == 0) { 2681 char *argv[] = { INTERNAL_LS, "", NULL }; 2682 2683 argv[1] = dirname; 2684 retrieve(argv, dirname); 2685 goto out; 2686 } 2687 perror_reply(550, whichf); 2688 goto cleanup_send_file_list; 2689 } 2690 2691 if (S_ISREG(st.st_mode)) { 2692 /* 2693 * XXXRFC: 2694 * should we follow RFC959 and not work 2695 * for non directories? 2696 */ 2697 if (dout == NULL) { 2698 dout = dataconn("file list", (off_t)-1, "w"); 2699 if (dout == NULL) 2700 goto out; 2701 transflag++; 2702 } 2703 cprintf(dout, "%s%s\n", dirname, 2704 type == TYPE_A ? "\r" : ""); 2705 byte_count += strlen(dirname) + 1; 2706 continue; 2707 } else if (!S_ISDIR(st.st_mode)) 2708 continue; 2709 2710 if (dirname[strlen(dirname) - 1] == '/') 2711 trailingslash++; 2712 2713 if ((dirp = opendir(dirname)) == NULL) 2714 continue; 2715 2716 while ((dir = readdir(dirp)) != NULL) { 2717 char nbuf[MAXPATHLEN]; 2718 2719 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2720 continue; 2721 2722 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2723 trailingslash ? "" : "/", dir->d_name); 2724 2725 /* 2726 * We have to do a stat to ensure it's 2727 * not a directory or special file. 2728 */ 2729 /* 2730 * XXXRFC: 2731 * should we follow RFC959 and filter out 2732 * non files ? lukem - NO!, or not until 2733 * our ftp client uses MLS{T,D} for completion. 2734 */ 2735 if (simple || (stat(nbuf, &st) == 0 && 2736 S_ISREG(st.st_mode))) { 2737 char *p; 2738 2739 if (dout == NULL) { 2740 dout = dataconn("file list", (off_t)-1, 2741 "w"); 2742 if (dout == NULL) 2743 goto out; 2744 transflag++; 2745 } 2746 p = nbuf; 2747 if (nbuf[0] == '.' && nbuf[1] == '/') 2748 p = &nbuf[2]; 2749 cprintf(dout, "%s%s\n", p, 2750 type == TYPE_A ? "\r" : ""); 2751 byte_count += strlen(nbuf) + 1; 2752 } 2753 } 2754 (void) closedir(dirp); 2755 } 2756 2757 if (dout == NULL) 2758 reply(550, "No files found."); 2759 else if (ferror(dout) != 0) 2760 perror_reply(550, "Data connection"); 2761 else 2762 reply(226, "Transfer complete."); 2763 2764 cleanup_send_file_list: 2765 transflag = 0; 2766 closedataconn(dout); 2767 out: 2768 total_xfers++; 2769 total_xfers_out++; 2770 if (p) 2771 free(p); 2772 if (freeglob) 2773 globfree(&gl); 2774 } 2775 2776 char * 2777 conffilename(const char *s) 2778 { 2779 static char filename[MAXPATHLEN]; 2780 2781 if (*s == '/') 2782 strlcpy(filename, s, sizeof(filename)); 2783 else 2784 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2785 return (filename); 2786 } 2787 2788 /* 2789 * logxfer -- 2790 * if logging > 1, then based on the arguments, syslog a message: 2791 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2792 * else if file2 != NULL "<command> <file1> <file2>" 2793 * else "<command> <file1>" 2794 * if elapsed != NULL, append "in xxx.yyy seconds" 2795 * if error != NULL, append ": " + error 2796 * 2797 * if doxferlog != 0, syslog a wu-ftpd style xferlog entry 2798 */ 2799 void 2800 logxfer(const char *command, off_t bytes, const char *file1, const char *file2, 2801 const struct timeval *elapsed, const char *error) 2802 { 2803 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2804 const char *r1, *r2; 2805 char direction; 2806 size_t len; 2807 time_t now; 2808 2809 if (logging <=1 && !doxferlog) 2810 return; 2811 2812 r1 = r2 = NULL; 2813 if ((r1 = realpath(file1, realfile)) == NULL) 2814 r1 = file1; 2815 if (file2 != NULL) 2816 if ((r2 = realpath(file2, realfile)) == NULL) 2817 r2 = file2; 2818 2819 /* 2820 * syslog command 2821 */ 2822 if (logging > 1) { 2823 len = snprintf(buf, sizeof(buf), "%s %s", command, r1); 2824 if (bytes != (off_t)-1) 2825 len += snprintf(buf + len, sizeof(buf) - len, 2826 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 2827 else if (r2 != NULL) 2828 len += snprintf(buf + len, sizeof(buf) - len, 2829 " %s", r2); 2830 if (elapsed != NULL) 2831 len += snprintf(buf + len, sizeof(buf) - len, 2832 " in %ld.%.03d seconds", elapsed->tv_sec, 2833 (int)(elapsed->tv_usec / 1000)); 2834 if (error != NULL) 2835 len += snprintf(buf + len, sizeof(buf) - len, 2836 ": %s", error); 2837 syslog(LOG_INFO, "%s", buf); 2838 } 2839 2840 2841 /* 2842 * syslog wu-ftpd style log entry, prefixed with "xferlog: " 2843 */ 2844 if (!doxferlog) 2845 return; 2846 2847 if (strcmp(command, "get") == 0) 2848 direction = 'o'; 2849 else if (strcmp(command, "put") == 0 || strcmp(command, "append") == 0) 2850 direction = 'i'; 2851 else 2852 return; 2853 2854 time(&now); 2855 syslog(LOG_INFO, 2856 "xferlog%s: %.24s %ld %s " LLF " %s %c %s %c %c %s FTP 0 * %c", 2857 2858 /* 2859 * XXX: wu-ftpd puts (send) or (recv) in the syslog message, and removes 2860 * the full date. This may be problematic for accurate log parsing, 2861 * given that syslog messages don't contain the full date. 2862 */ 2863 #if 1 /* lukem's method; easier to convert to actual xferlog file */ 2864 "", 2865 ctime(&now), 2866 #else /* wu-ftpd's syslog method, with an extra unneeded space */ 2867 (direction == 'i') ? " (recv)" : " (send)", 2868 "", 2869 #endif 2870 elapsed == NULL ? 0 : elapsed->tv_sec + (elapsed->tv_usec > 0), 2871 remotehost, 2872 bytes == (off_t)-1 ? 0 : (LLT) bytes, 2873 r1, 2874 type == TYPE_A ? 'a' : 'b', 2875 "_", /* XXX: take conversions into account? */ 2876 direction, 2877 2878 curclass.type == CLASS_GUEST ? 'a' : 2879 curclass.type == CLASS_CHROOT ? 'g' : 2880 curclass.type == CLASS_REAL ? 'r' : '?', 2881 2882 curclass.type == CLASS_GUEST ? pw->pw_passwd : pw->pw_name, 2883 error != NULL ? 'i' : 'c' 2884 ); 2885 } 2886 2887 /* 2888 * Determine if `password' is valid for user given in `pw'. 2889 * Returns 2 if password expired, 1 if otherwise failed, 0 if ok 2890 */ 2891 int 2892 checkpassword(const struct passwd *pw, const char *password) 2893 { 2894 char *orig, *new; 2895 time_t expire; 2896 2897 expire = 0; 2898 if (pw == NULL) 2899 return 1; 2900 2901 orig = pw->pw_passwd; /* save existing password */ 2902 expire = pw->pw_expire; 2903 2904 if (orig[0] == '\0') /* don't allow empty passwords */ 2905 return 1; 2906 2907 new = crypt(password, orig); /* encrypt given password */ 2908 if (strcmp(new, orig) != 0) /* compare */ 2909 return 1; 2910 2911 if (expire && time(NULL) >= expire) 2912 return 2; /* check if expired */ 2913 2914 return 0; /* OK! */ 2915 } 2916 2917 char * 2918 xstrdup(const char *s) 2919 { 2920 char *new = strdup(s); 2921 2922 if (new == NULL) 2923 fatal("Local resource failure: malloc"); 2924 /* NOTREACHED */ 2925 return (new); 2926 } 2927 2928 /* 2929 * As per fprintf(), but increment total_bytes and total_bytes_out, 2930 * by the appropriate amount. 2931 */ 2932 void 2933 cprintf(FILE *fd, const char *fmt, ...) 2934 { 2935 off_t b; 2936 va_list ap; 2937 2938 va_start(ap, fmt); 2939 b = vfprintf(fd, fmt, ap); 2940 total_bytes += b; 2941 total_bytes_out += b; 2942 } 2943