ftpd.c revision 1.129
1 /* $NetBSD: ftpd.c,v 1.129 2001/09/19 00:50:52 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2001 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 1.129 2001/09/19 00:50:52 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 int sflag; 173 int stru; /* avoid C keyword */ 174 int mode; 175 int dataport; /* use specific data port */ 176 int dopidfile; /* maintain pid file */ 177 int doutmp; /* update utmp file */ 178 int dowtmp; /* update wtmp file */ 179 int doxferlog; /* syslog wu-ftpd style xferlog entries */ 180 int dropprivs; /* if privileges should or have been dropped */ 181 int mapped; /* IPv4 connection on AF_INET6 socket */ 182 off_t file_size; 183 off_t byte_count; 184 static char ttyline[20]; 185 static struct utmp utmp; /* for utmp */ 186 187 static const char *anondir = NULL; 188 static const char *confdir = _DEFAULT_CONFDIR; 189 190 #if defined(KERBEROS) || defined(KERBEROS5) 191 int has_ccache = 0; 192 int notickets = 1; 193 char *krbtkfile_env = NULL; 194 char *tty = ttyline; 195 int login_krb5_forwardable_tgt = 0; 196 #endif 197 198 int epsvall = 0; 199 200 /* 201 * Timeout intervals for retrying connections 202 * to hosts that don't accept PORT cmds. This 203 * is a kludge, but given the problems with TCP... 204 */ 205 #define SWAITMAX 90 /* wait at most 90 seconds */ 206 #define SWAITINT 5 /* interval between retries */ 207 208 int swaitmax = SWAITMAX; 209 int swaitint = SWAITINT; 210 211 static int bind_pasv_addr(void); 212 static int checkuser(const char *, const char *, int, int, char **); 213 static int checkaccess(const char *); 214 static int checkpassword(const struct passwd *, const char *); 215 static void end_login(void); 216 static FILE *getdatasock(const char *); 217 static char *gunique(const char *); 218 static void logremotehost(struct sockinet *); 219 static void lostconn(int); 220 static void myoob(int); 221 static int receive_data(FILE *, FILE *); 222 static int send_data(FILE *, FILE *, off_t, int); 223 static struct passwd *sgetpwnam(const char *); 224 225 int main(int, char *[]); 226 227 #if defined(KERBEROS) 228 int klogin(struct passwd *, char *, char *, char *); 229 void kdestroy(void); 230 #endif 231 #if defined(KERBEROS5) 232 int k5login(struct passwd *, char *, char *, char *); 233 void k5destroy(void); 234 #endif 235 236 int 237 main(int argc, char *argv[]) 238 { 239 int addrlen, ch, on = 1, tos, keepalive; 240 #ifdef KERBEROS5 241 krb5_error_code kerror; 242 #endif 243 char *p; 244 245 connections = 1; 246 debug = 0; 247 logging = 0; 248 pdata = -1; 249 sflag = 0; 250 dataport = 0; 251 dopidfile = 1; /* default: DO use a pid file to count users */ 252 doutmp = 0; /* default: Do NOT log to utmp */ 253 dowtmp = 1; /* default: DO log to wtmp */ 254 doxferlog = 0; /* default: Do NOT syslog xferlog */ 255 dropprivs = 0; 256 mapped = 0; 257 usedefault = 1; 258 emailaddr = NULL; 259 hostname[0] = '\0'; 260 homedir[0] = '\0'; 261 gidcount = 0; 262 is_oob = 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 ftp_loop(); 521 /* NOTREACHED */ 522 } 523 524 static void 525 lostconn(int signo) 526 { 527 528 if (debug) 529 syslog(LOG_DEBUG, "lost connection"); 530 dologout(1); 531 } 532 533 /* 534 * Save the result of a getpwnam. Used for USER command, since 535 * the data returned must not be clobbered by any other command 536 * (e.g., globbing). 537 */ 538 static struct passwd * 539 sgetpwnam(const char *name) 540 { 541 static struct passwd save; 542 struct passwd *p; 543 544 if ((p = getpwnam(name)) == NULL) 545 return (p); 546 if (save.pw_name) { 547 free((char *)save.pw_name); 548 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 549 free((char *)save.pw_passwd); 550 free((char *)save.pw_gecos); 551 free((char *)save.pw_dir); 552 free((char *)save.pw_shell); 553 } 554 save = *p; 555 save.pw_name = xstrdup(p->pw_name); 556 save.pw_passwd = xstrdup(p->pw_passwd); 557 save.pw_gecos = xstrdup(p->pw_gecos); 558 save.pw_dir = xstrdup(p->pw_dir); 559 save.pw_shell = xstrdup(p->pw_shell); 560 return (&save); 561 } 562 563 static int login_attempts; /* number of failed login attempts */ 564 static int askpasswd; /* had user command, ask for passwd */ 565 static char curname[10]; /* current USER name */ 566 567 /* 568 * USER command. 569 * Sets global passwd pointer pw if named account exists and is acceptable; 570 * sets askpasswd if a PASS command is expected. If logged in previously, 571 * need to reset state. If name is "ftp" or "anonymous", the name is not in 572 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 573 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 574 * requesting login privileges. Disallow anyone who does not have a standard 575 * shell as returned by getusershell(). Disallow anyone mentioned in the file 576 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 577 */ 578 void 579 user(const char *name) 580 { 581 if (logged_in) { 582 switch (curclass.type) { 583 case CLASS_GUEST: 584 reply(530, "Can't change user from guest login."); 585 return; 586 case CLASS_CHROOT: 587 reply(530, "Can't change user from chroot user."); 588 return; 589 case CLASS_REAL: 590 if (dropprivs) { 591 reply(530, "Can't change user."); 592 return; 593 } 594 end_login(); 595 break; 596 default: 597 abort(); 598 } 599 } 600 601 #if defined(KERBEROS) 602 kdestroy(); 603 #endif 604 #if defined(KERBEROS5) 605 k5destroy(); 606 #endif 607 608 curclass.type = CLASS_REAL; 609 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 610 /* need `pw' setup for checkaccess() and checkuser () */ 611 if ((pw = sgetpwnam("ftp")) == NULL) 612 reply(530, "User %s unknown.", name); 613 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 614 reply(530, "User %s access denied.", name); 615 else { 616 curclass.type = CLASS_GUEST; 617 askpasswd = 1; 618 reply(331, 619 "Guest login ok, type your name as password."); 620 } 621 if (!askpasswd && logging) 622 syslog(LOG_NOTICE, 623 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 624 return; 625 } 626 627 pw = sgetpwnam(name); 628 if (logging) 629 strlcpy(curname, name, sizeof(curname)); 630 631 #ifdef SKEY 632 if (skey_haskey(name) == 0) { 633 const char *myskey; 634 635 myskey = skey_keyinfo(name); 636 reply(331, "Password [%s] required for %s.", 637 myskey ? myskey : "error getting challenge", name); 638 } else 639 #endif 640 reply(331, "Password required for %s.", name); 641 642 askpasswd = 1; 643 /* 644 * Delay before reading passwd after first failed 645 * attempt to slow down passwd-guessing programs. 646 */ 647 if (login_attempts) 648 sleep((unsigned) login_attempts); 649 } 650 651 /* 652 * Determine whether something is to happen (allow access, chroot) 653 * for a user. Each line is a shell-style glob followed by 654 * `yes' or `no'. 655 * 656 * For backward compatibility, `allow' and `deny' are synonymns 657 * for `yes' and `no', respectively. 658 * 659 * Each glob is matched against the username in turn, and the first 660 * match found is used. If no match is found, the result is the 661 * argument `def'. If a match is found but without and explicit 662 * `yes'/`no', the result is the opposite of def. 663 * 664 * If the file doesn't exist at all, the result is the argument 665 * `nofile' 666 * 667 * Any line starting with `#' is considered a comment and ignored. 668 * 669 * Returns 0 if the user is denied, or 1 if they are allowed. 670 * 671 * NOTE: needs struct passwd *pw setup before use. 672 */ 673 static int 674 checkuser(const char *fname, const char *name, int def, int nofile, 675 char **retclass) 676 { 677 FILE *fd; 678 int retval; 679 char *glob, *perm, *class, *buf, *p; 680 size_t len, line; 681 682 retval = def; 683 if (retclass != NULL) 684 *retclass = NULL; 685 if ((fd = fopen(conffilename(fname), "r")) == NULL) 686 return nofile; 687 688 line = 0; 689 for (; 690 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 691 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 692 free(buf), buf = NULL) { 693 glob = perm = class = NULL; 694 p = buf; 695 if (len < 1) 696 continue; 697 if (p[len - 1] == '\n') 698 p[--len] = '\0'; 699 if (EMPTYSTR(p)) 700 continue; 701 702 NEXTWORD(p, glob); 703 NEXTWORD(p, perm); 704 NEXTWORD(p, class); 705 if (EMPTYSTR(glob)) 706 continue; 707 if (!EMPTYSTR(class)) { 708 if (strcasecmp(class, "all") == 0 || 709 strcasecmp(class, "none") == 0) { 710 syslog(LOG_WARNING, 711 "%s line %d: illegal user-defined class `%s' - skipping entry", 712 fname, (int)line, class); 713 continue; 714 } 715 } 716 717 /* have a host specifier */ 718 if ((p = strchr(glob, '@')) != NULL) { 719 unsigned long net, mask, addr; 720 int bits; 721 722 *p++ = '\0'; 723 /* check against network or CIDR */ 724 if (isdigit(*p) && 725 (bits = inet_net_pton(AF_INET, p, 726 &net, sizeof(net))) != -1) { 727 net = ntohl(net); 728 mask = 0xffffffffU << (32 - bits); 729 addr = ntohl(his_addr.su_addr.s_addr); 730 if ((addr & mask) != net) 731 continue; 732 733 /* check against hostname glob */ 734 } else if (fnmatch(p, remotehost, 0) != 0) 735 continue; 736 } 737 738 /* have a group specifier */ 739 if ((p = strchr(glob, ':')) != NULL) { 740 gid_t *groups, *ng; 741 int gsize, i, found; 742 743 *p++ = '\0'; 744 groups = NULL; 745 gsize = 16; 746 do { 747 ng = realloc(groups, gsize * sizeof(gid_t)); 748 if (ng == NULL) 749 fatal( 750 "Local resource failure: realloc"); 751 groups = ng; 752 } while (getgrouplist(pw->pw_name, pw->pw_gid, 753 groups, &gsize) == -1); 754 found = 0; 755 for (i = 0; i < gsize; i++) { 756 struct group *g; 757 758 if ((g = getgrgid(groups[i])) == NULL) 759 continue; 760 if (fnmatch(p, g->gr_name, 0) == 0) { 761 found = 1; 762 break; 763 } 764 } 765 free(groups); 766 if (!found) 767 continue; 768 } 769 770 /* check against username glob */ 771 if (fnmatch(glob, name, 0) != 0) 772 continue; 773 774 if (perm != NULL && 775 ((strcasecmp(perm, "allow") == 0) || 776 (strcasecmp(perm, "yes") == 0))) 777 retval = 1; 778 else if (perm != NULL && 779 ((strcasecmp(perm, "deny") == 0) || 780 (strcasecmp(perm, "no") == 0))) 781 retval = 0; 782 else 783 retval = !def; 784 if (!EMPTYSTR(class) && retclass != NULL) 785 *retclass = xstrdup(class); 786 free(buf); 787 break; 788 } 789 (void) fclose(fd); 790 return (retval); 791 } 792 793 /* 794 * Check if user is allowed by /etc/ftpusers 795 * returns 1 for yes, 0 for no 796 * 797 * NOTE: needs struct passwd *pw setup (for checkuser()) 798 */ 799 static int 800 checkaccess(const char *name) 801 { 802 803 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 804 } 805 806 /* 807 * Terminate login as previous user (if any), resetting state; 808 * used when USER command is given or login fails. 809 */ 810 static void 811 end_login(void) 812 { 813 814 if (logged_in) { 815 if (dowtmp) 816 logwtmp(ttyline, "", ""); 817 if (doutmp) 818 logout(utmp.ut_line); 819 } 820 /* reset login state */ 821 show_chdir_messages(-1); /* flush chdir cache */ 822 if (pw != NULL && pw->pw_passwd != NULL) 823 memset(pw->pw_passwd, 0, strlen(pw->pw_passwd)); 824 pw = NULL; 825 logged_in = 0; 826 quietmessages = 0; 827 gidcount = 0; 828 curclass.type = CLASS_REAL; 829 (void) seteuid((uid_t)0); 830 } 831 832 void 833 pass(const char *passwd) 834 { 835 int rval; 836 const char *cp, *shell; 837 char *class, root[MAXPATHLEN]; 838 839 class = NULL; 840 if (logged_in || askpasswd == 0) { 841 reply(503, "Login with USER first."); 842 return; 843 } 844 askpasswd = 0; 845 if (curclass.type != CLASS_GUEST) { 846 /* "ftp" is the only account allowed with no password */ 847 if (pw == NULL) { 848 rval = 1; /* failure below */ 849 goto skip; 850 } 851 #if defined(KERBEROS) 852 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 853 rval = 0; 854 goto skip; 855 } 856 #endif 857 #if defined(KERBEROS5) 858 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 859 rval = 0; 860 goto skip; 861 } 862 #endif 863 #ifdef SKEY 864 if (skey_haskey(pw->pw_name) == 0) { 865 char *p; 866 int r; 867 868 p = xstrdup(passwd); 869 r = skey_passcheck(pw->pw_name, p); 870 free(p); 871 if (r != -1) { 872 rval = 0; 873 goto skip; 874 } 875 } 876 #endif 877 if (!sflag) 878 rval = checkpassword(pw, passwd); 879 else 880 rval = 1; 881 882 skip: 883 884 /* 885 * If rval > 0, the user failed the authentication check 886 * above. If rval == 0, either Kerberos or local 887 * authentication succeeded. 888 */ 889 if (rval) { 890 reply(530, "%s", rval == 2 ? "Password expired." : 891 "Login incorrect."); 892 if (logging) { 893 syslog(LOG_NOTICE, 894 "FTP LOGIN FAILED FROM %s", remotehost); 895 syslog(LOG_AUTHPRIV | LOG_NOTICE, 896 "FTP LOGIN FAILED FROM %s, %s", 897 remotehost, curname); 898 } 899 pw = NULL; 900 if (login_attempts++ >= 5) { 901 syslog(LOG_NOTICE, 902 "repeated login failures from %s", 903 remotehost); 904 exit(0); 905 } 906 return; 907 } 908 } 909 910 /* password ok; see if anything else prevents login */ 911 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 912 reply(530, "User %s may not use FTP.", pw->pw_name); 913 if (logging) 914 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 915 remotehost, pw->pw_name); 916 goto bad; 917 } 918 /* if not guest user, check for valid shell */ 919 if ((shell = pw->pw_shell) == NULL || *shell == 0) 920 shell = _PATH_BSHELL; 921 while ((cp = getusershell()) != NULL) 922 if (strcmp(cp, shell) == 0) 923 break; 924 endusershell(); 925 if (cp == NULL && curclass.type != CLASS_GUEST) { 926 reply(530, "User %s may not use FTP.", pw->pw_name); 927 if (logging) 928 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 929 remotehost, pw->pw_name); 930 goto bad; 931 } 932 933 login_attempts = 0; /* this time successful */ 934 if (setegid((gid_t)pw->pw_gid) < 0) { 935 reply(550, "Can't set gid."); 936 goto bad; 937 } 938 (void) initgroups(pw->pw_name, pw->pw_gid); 939 /* cache groups for cmds.c::matchgroup() */ 940 gidcount = getgroups(sizeof(gidlist), gidlist); 941 942 /* open wtmp before chroot */ 943 if (dowtmp) 944 logwtmp(ttyline, pw->pw_name, remotehost); 945 946 /* open utmp before chroot */ 947 if (doutmp) { 948 memset((void *)&utmp, 0, sizeof(utmp)); 949 (void)time(&utmp.ut_time); 950 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 951 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 952 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 953 login(&utmp); 954 } 955 956 logged_in = 1; 957 958 /* check user in /etc/ftpchroot */ 959 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 960 if (curclass.type == CLASS_GUEST) { 961 syslog(LOG_NOTICE, 962 "Can't change guest user to chroot class; remove entry in %s", 963 _PATH_FTPCHROOT); 964 exit(1); 965 } 966 curclass.type = CLASS_CHROOT; 967 } 968 if (class == NULL) { 969 switch (curclass.type) { 970 case CLASS_GUEST: 971 class = xstrdup("guest"); 972 break; 973 case CLASS_CHROOT: 974 class = xstrdup("chroot"); 975 break; 976 case CLASS_REAL: 977 class = xstrdup("real"); 978 break; 979 default: 980 syslog(LOG_ERR, "unknown curclass.type %d; aborting", 981 curclass.type); 982 abort(); 983 } 984 } 985 986 /* parse ftpd.conf, setting up various parameters */ 987 parse_conf(class); 988 connections = 1; 989 if (dopidfile) 990 count_users(); 991 if (curclass.limit != -1 && connections > curclass.limit) { 992 if (! EMPTYSTR(curclass.limitfile)) 993 (void)display_file(conffilename(curclass.limitfile), 994 530); 995 reply(530, 996 "User %s access denied, connection limit of %d reached.", 997 pw->pw_name, curclass.limit); 998 syslog(LOG_NOTICE, 999 "Maximum connection limit of %d for class %s reached, login refused for %s", 1000 curclass.limit, curclass.classname, pw->pw_name); 1001 goto bad; 1002 } 1003 1004 homedir[0] = '/'; 1005 switch (curclass.type) { 1006 case CLASS_GUEST: 1007 /* 1008 * We MUST do a chdir() after the chroot. Otherwise 1009 * the old current directory will be accessible as "." 1010 * outside the new root! 1011 */ 1012 format_path(root, 1013 curclass.chroot ? curclass.chroot : 1014 anondir ? anondir : 1015 pw->pw_dir); 1016 format_path(homedir, 1017 curclass.homedir ? curclass.homedir : 1018 "/"); 1019 if (EMPTYSTR(homedir)) 1020 homedir[0] = '/'; 1021 if (EMPTYSTR(root) || chroot(root) < 0) { 1022 syslog(LOG_NOTICE, 1023 "GUEST user %s: can't chroot to %s: %m", 1024 pw->pw_name, root); 1025 goto bad_guest; 1026 } 1027 if (chdir(homedir) < 0) { 1028 syslog(LOG_NOTICE, 1029 "GUEST user %s: can't chdir to %s: %m", 1030 pw->pw_name, homedir); 1031 bad_guest: 1032 reply(550, "Can't set guest privileges."); 1033 goto bad; 1034 } 1035 break; 1036 case CLASS_CHROOT: 1037 format_path(root, 1038 curclass.chroot ? curclass.chroot : 1039 pw->pw_dir); 1040 format_path(homedir, 1041 curclass.homedir ? curclass.homedir : 1042 "/"); 1043 if (EMPTYSTR(homedir)) 1044 homedir[0] = '/'; 1045 if (EMPTYSTR(root) || chroot(root) < 0) { 1046 syslog(LOG_NOTICE, 1047 "CHROOT user %s: can't chroot to %s: %m", 1048 pw->pw_name, root); 1049 goto bad_chroot; 1050 } 1051 if (chdir(homedir) < 0) { 1052 syslog(LOG_NOTICE, 1053 "CHROOT user %s: can't chdir to %s: %m", 1054 pw->pw_name, homedir); 1055 bad_chroot: 1056 reply(550, "Can't change root."); 1057 goto bad; 1058 } 1059 break; 1060 case CLASS_REAL: 1061 /* only chroot REAL if explictly requested */ 1062 if (! EMPTYSTR(curclass.chroot)) { 1063 format_path(root, curclass.chroot); 1064 if (EMPTYSTR(root) || chroot(root) < 0) { 1065 syslog(LOG_NOTICE, 1066 "REAL user %s: can't chroot to %s: %m", 1067 pw->pw_name, root); 1068 goto bad_chroot; 1069 } 1070 } 1071 format_path(homedir, 1072 curclass.homedir ? curclass.homedir : 1073 pw->pw_dir); 1074 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1075 if (chdir("/") < 0) { 1076 syslog(LOG_NOTICE, 1077 "REAL user %s: can't chdir to %s: %m", 1078 pw->pw_name, 1079 !EMPTYSTR(homedir) ? homedir : "/"); 1080 reply(530, 1081 "User %s: can't change directory to %s.", 1082 pw->pw_name, 1083 !EMPTYSTR(homedir) ? homedir : "/"); 1084 goto bad; 1085 } else { 1086 reply(-230, 1087 "No directory! Logging in with home=/"); 1088 homedir[0] = '/'; 1089 } 1090 } 1091 break; 1092 } 1093 setlogin(pw->pw_name); 1094 if (dropprivs || 1095 (curclass.type != CLASS_REAL && 1096 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1097 dropprivs++; 1098 if (setgid((gid_t)pw->pw_gid) < 0) { 1099 reply(550, "Can't set gid."); 1100 goto bad; 1101 } 1102 if (setuid((uid_t)pw->pw_uid) < 0) { 1103 reply(550, "Can't set uid."); 1104 goto bad; 1105 } 1106 } else { 1107 if (seteuid((uid_t)pw->pw_uid) < 0) { 1108 reply(550, "Can't set uid."); 1109 goto bad; 1110 } 1111 } 1112 setenv("HOME", homedir, 1); 1113 1114 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1115 quietmessages = 1; 1116 1117 /* 1118 * Display a login message, if it exists. 1119 * N.B. reply(230,) must follow the message. 1120 */ 1121 (void)display_file(conffilename(curclass.motd), 230); 1122 show_chdir_messages(230); 1123 if (curclass.type == CLASS_GUEST) { 1124 char *p; 1125 1126 reply(230, "Guest login ok, access restrictions apply."); 1127 #if HAVE_SETPROCTITLE 1128 snprintf(proctitle, sizeof(proctitle), 1129 "%s: anonymous/%s", remotehost, passwd); 1130 setproctitle("%s", proctitle); 1131 #endif /* HAVE_SETPROCTITLE */ 1132 if (logging) 1133 syslog(LOG_INFO, 1134 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1135 remotehost, passwd, 1136 curclass.classname, CURCLASSTYPE); 1137 /* store guest password reply into pw_passwd */ 1138 REASSIGN(pw->pw_passwd, xstrdup(passwd)); 1139 for (p = pw->pw_passwd; *p; p++) 1140 if (!isgraph(*p)) 1141 *p = '_'; 1142 } else { 1143 reply(230, "User %s logged in.", pw->pw_name); 1144 #if HAVE_SETPROCTITLE 1145 snprintf(proctitle, sizeof(proctitle), 1146 "%s: %s", remotehost, pw->pw_name); 1147 setproctitle("%s", proctitle); 1148 #endif /* HAVE_SETPROCTITLE */ 1149 if (logging) 1150 syslog(LOG_INFO, 1151 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1152 remotehost, pw->pw_name, 1153 curclass.classname, CURCLASSTYPE); 1154 } 1155 (void) umask(curclass.umask); 1156 goto cleanuppass; 1157 1158 bad: 1159 /* Forget all about it... */ 1160 end_login(); 1161 1162 cleanuppass: 1163 if (class) 1164 free(class); 1165 } 1166 1167 void 1168 retrieve(char *argv[], const char *name) 1169 { 1170 FILE *fin, *dout; 1171 struct stat st; 1172 int (*closefunc)(FILE *) = NULL; 1173 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1174 struct timeval start, finish, td, *tdp; 1175 const char *dispname; 1176 1177 sendrv = closerv = stderrfd = -1; 1178 isconversion = isdata = isls = log = 0; 1179 tdp = NULL; 1180 dispname = name; 1181 fin = dout = NULL; 1182 if (argv == NULL) { /* if not running a command ... */ 1183 log = 1; 1184 isdata = 1; 1185 fin = fopen(name, "r"); 1186 closefunc = fclose; 1187 if (fin == NULL) /* doesn't exist?; try a conversion */ 1188 argv = do_conversion(name); 1189 if (argv != NULL) { 1190 isconversion++; 1191 syslog(LOG_DEBUG, "get command: '%s' on '%s'", 1192 argv[0], name); 1193 } 1194 } 1195 if (argv != NULL) { 1196 char temp[MAXPATHLEN]; 1197 1198 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1199 isls = 1; 1200 stderrfd = -1; 1201 } else { 1202 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1203 stderrfd = mkstemp(temp); 1204 if (stderrfd != -1) 1205 (void)unlink(temp); 1206 } 1207 dispname = argv[0]; 1208 fin = ftpd_popen(argv, "r", stderrfd); 1209 closefunc = ftpd_pclose; 1210 st.st_size = -1; 1211 st.st_blksize = BUFSIZ; 1212 } 1213 if (fin == NULL) { 1214 if (errno != 0) { 1215 perror_reply(550, dispname); 1216 if (log) 1217 logxfer("get", -1, name, NULL, NULL, 1218 strerror(errno)); 1219 } 1220 goto cleanupretrieve; 1221 } 1222 byte_count = -1; 1223 if (argv == NULL 1224 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1225 reply(550, "%s: not a plain file.", dispname); 1226 goto done; 1227 } 1228 if (restart_point) { 1229 if (type == TYPE_A) { 1230 off_t i; 1231 int c; 1232 1233 for (i = 0; i < restart_point; i++) { 1234 if ((c=getc(fin)) == EOF) { 1235 perror_reply(550, dispname); 1236 goto done; 1237 } 1238 if (c == '\n') 1239 i++; 1240 } 1241 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1242 perror_reply(550, dispname); 1243 goto done; 1244 } 1245 } 1246 dout = dataconn(dispname, st.st_size, "w"); 1247 if (dout == NULL) 1248 goto done; 1249 1250 (void)gettimeofday(&start, NULL); 1251 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1252 (void)gettimeofday(&finish, NULL); 1253 (void) fclose(dout); /* close now to affect timing stats */ 1254 dout = NULL; 1255 timersub(&finish, &start, &td); 1256 tdp = &td; 1257 done: 1258 if (log) 1259 logxfer("get", byte_count, name, NULL, tdp, NULL); 1260 closerv = (*closefunc)(fin); 1261 if (sendrv == 0) { 1262 FILE *err; 1263 struct stat sb; 1264 1265 if (!isls && argv != NULL && closerv != 0) { 1266 reply(-226, 1267 "Command returned an exit status of %d", 1268 closerv); 1269 if (isconversion) 1270 syslog(LOG_WARNING, 1271 "retrieve command: '%s' returned %d", 1272 argv[0], closerv); 1273 } 1274 if (!isls && argv != NULL && stderrfd != -1 && 1275 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1276 ((err = fdopen(stderrfd, "r")) != NULL)) { 1277 char *cp, line[LINE_MAX]; 1278 1279 reply(-226, "Command error messages:"); 1280 rewind(err); 1281 while (fgets(line, sizeof(line), err) != NULL) { 1282 if ((cp = strchr(line, '\n')) != NULL) 1283 *cp = '\0'; 1284 reply(0, " %s", line); 1285 } 1286 (void) fflush(stdout); 1287 (void) fclose(err); 1288 /* a reply(226,) must follow */ 1289 } 1290 reply(226, "Transfer complete."); 1291 } 1292 cleanupretrieve: 1293 closedataconn(dout); 1294 if (stderrfd != -1) 1295 (void)close(stderrfd); 1296 if (isconversion) 1297 free(argv); 1298 } 1299 1300 void 1301 store(const char *name, const char *mode, int unique) 1302 { 1303 FILE *fout, *din; 1304 struct stat st; 1305 int (*closefunc)(FILE *); 1306 struct timeval start, finish, td, *tdp; 1307 char *desc; 1308 1309 din = NULL; 1310 desc = (*mode == 'w') ? "put" : "append"; 1311 if (unique && stat(name, &st) == 0 && 1312 (name = gunique(name)) == NULL) { 1313 logxfer(desc, -1, name, NULL, NULL, 1314 "cannot create unique file"); 1315 goto cleanupstore; 1316 } 1317 1318 if (restart_point) 1319 mode = "r+"; 1320 fout = fopen(name, mode); 1321 closefunc = fclose; 1322 tdp = NULL; 1323 if (fout == NULL) { 1324 perror_reply(553, name); 1325 logxfer(desc, -1, name, NULL, NULL, strerror(errno)); 1326 goto cleanupstore; 1327 } 1328 byte_count = -1; 1329 if (restart_point) { 1330 if (type == TYPE_A) { 1331 off_t i; 1332 int c; 1333 1334 for (i = 0; i < restart_point; i++) { 1335 if ((c=getc(fout)) == EOF) { 1336 perror_reply(550, name); 1337 goto done; 1338 } 1339 if (c == '\n') 1340 i++; 1341 } 1342 /* 1343 * We must do this seek to "current" position 1344 * because we are changing from reading to 1345 * writing. 1346 */ 1347 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1348 perror_reply(550, name); 1349 goto done; 1350 } 1351 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1352 perror_reply(550, name); 1353 goto done; 1354 } 1355 } 1356 din = dataconn(name, (off_t)-1, "r"); 1357 if (din == NULL) 1358 goto done; 1359 (void)gettimeofday(&start, NULL); 1360 if (receive_data(din, fout) == 0) { 1361 if (unique) 1362 reply(226, "Transfer complete (unique file name:%s).", 1363 name); 1364 else 1365 reply(226, "Transfer complete."); 1366 } 1367 (void)gettimeofday(&finish, NULL); 1368 (void) fclose(din); /* close now to affect timing stats */ 1369 din = NULL; 1370 timersub(&finish, &start, &td); 1371 tdp = &td; 1372 done: 1373 logxfer(desc, byte_count, name, NULL, tdp, NULL); 1374 (*closefunc)(fout); 1375 cleanupstore: 1376 closedataconn(din); 1377 } 1378 1379 static FILE * 1380 getdatasock(const char *mode) 1381 { 1382 int on, s, t, tries; 1383 in_port_t port; 1384 1385 on = 1; 1386 if (data >= 0) 1387 return (fdopen(data, mode)); 1388 if (! dropprivs) 1389 (void) seteuid((uid_t)0); 1390 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1391 if (s < 0) 1392 goto bad; 1393 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1394 (char *) &on, sizeof(on)) < 0) 1395 goto bad; 1396 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1397 (char *) &on, sizeof(on)) < 0) 1398 goto bad; 1399 /* anchor socket to avoid multi-homing problems */ 1400 data_source = ctrl_addr; 1401 /* 1402 * By default source port for PORT connctions is 1403 * ctrlport-1 (see RFC959 section 5.2). 1404 * However, if privs have been dropped and that 1405 * would be < IPPORT_RESERVED, use a random port 1406 * instead. 1407 */ 1408 if (dataport) 1409 port = dataport; 1410 else 1411 port = ntohs(ctrl_addr.su_port) - 1; 1412 if (dropprivs && port < IPPORT_RESERVED) 1413 port = 0; /* use random port */ 1414 data_source.su_port = htons(port); 1415 1416 for (tries = 1; ; tries++) { 1417 if (bind(s, (struct sockaddr *)&data_source.si_su, 1418 data_source.su_len) >= 0) 1419 break; 1420 if (errno != EADDRINUSE || tries > 10) 1421 goto bad; 1422 sleep(tries); 1423 } 1424 if (! dropprivs) 1425 (void) seteuid((uid_t)pw->pw_uid); 1426 #ifdef IP_TOS 1427 if (!mapped && ctrl_addr.su_family == AF_INET) { 1428 on = IPTOS_THROUGHPUT; 1429 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1430 sizeof(int)) < 0) 1431 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1432 } 1433 #endif 1434 return (fdopen(s, mode)); 1435 bad: 1436 /* Return the real value of errno (close may change it) */ 1437 t = errno; 1438 if (! dropprivs) 1439 (void) seteuid((uid_t)pw->pw_uid); 1440 (void) close(s); 1441 errno = t; 1442 return (NULL); 1443 } 1444 1445 FILE * 1446 dataconn(const char *name, off_t size, const char *mode) 1447 { 1448 char sizebuf[32]; 1449 FILE *file; 1450 int retry = 0, tos, keepalive; 1451 1452 file_size = size; 1453 byte_count = 0; 1454 if (size != (off_t) -1) 1455 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1456 (LLT)size, PLURAL(size)); 1457 else 1458 sizebuf[0] = '\0'; 1459 if (pdata >= 0) { 1460 struct sockinet from; 1461 int s, fromlen = sizeof(from.su_len); 1462 1463 (void) alarm(curclass.timeout); 1464 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 1465 (void) alarm(0); 1466 if (s < 0) { 1467 reply(425, "Can't open data connection."); 1468 (void) close(pdata); 1469 pdata = -1; 1470 return (NULL); 1471 } 1472 (void) close(pdata); 1473 pdata = s; 1474 switch (from.su_family) { 1475 case AF_INET: 1476 #ifdef IP_TOS 1477 if (!mapped) { 1478 tos = IPTOS_THROUGHPUT; 1479 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1480 (char *)&tos, sizeof(int)); 1481 } 1482 break; 1483 #endif 1484 } 1485 /* Set keepalives on the socket to detect dropped conns. */ 1486 #ifdef SO_KEEPALIVE 1487 keepalive = 1; 1488 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1489 (char *)&keepalive, sizeof(int)); 1490 #endif 1491 reply(150, "Opening %s mode data connection for '%s'%s.", 1492 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1493 return (fdopen(pdata, mode)); 1494 } 1495 if (data >= 0) { 1496 reply(125, "Using existing data connection for '%s'%s.", 1497 name, sizebuf); 1498 usedefault = 1; 1499 return (fdopen(data, mode)); 1500 } 1501 if (usedefault) 1502 data_dest = his_addr; 1503 usedefault = 1; 1504 file = getdatasock(mode); 1505 if (file == NULL) { 1506 char hbuf[NI_MAXHOST]; 1507 char pbuf[NI_MAXSERV]; 1508 1509 if (getnameinfo((struct sockaddr *)&data_source.si_su, 1510 data_source.su_len, hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1511 NI_NUMERICHOST | NI_NUMERICSERV)) 1512 strlcpy(hbuf, "?", sizeof(hbuf)); 1513 reply(425, "Can't create data socket (%s,%s): %s.", 1514 hbuf, pbuf, strerror(errno)); 1515 return (NULL); 1516 } 1517 data = fileno(file); 1518 while (connect(data, (struct sockaddr *)&data_dest.si_su, 1519 data_dest.su_len) < 0) { 1520 if (errno == EADDRINUSE && retry < swaitmax) { 1521 sleep((unsigned) swaitint); 1522 retry += swaitint; 1523 continue; 1524 } 1525 perror_reply(425, "Can't build data connection"); 1526 (void) fclose(file); 1527 data = -1; 1528 return (NULL); 1529 } 1530 reply(150, "Opening %s mode data connection for '%s'%s.", 1531 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1532 return (file); 1533 } 1534 1535 void 1536 closedataconn(FILE *fd) 1537 { 1538 1539 if (fd != NULL) 1540 (void)fclose(fd); 1541 data = -1; 1542 if (pdata >= 0) 1543 (void)close(pdata); 1544 pdata = -1; 1545 } 1546 1547 /* 1548 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1549 * encapsulation of the data subject * to Mode, Structure, and Type. 1550 * 1551 * NB: Form isn't handled. 1552 */ 1553 static int 1554 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1555 { 1556 int c, filefd, netfd, rval; 1557 char *buf; 1558 1559 transflag = 1; 1560 rval = -1; 1561 buf = NULL; 1562 if (setjmp(urgcatch)) 1563 goto cleanup_send_data; 1564 1565 switch (type) { 1566 1567 case TYPE_A: 1568 /* XXXLUKEM: rate limit ascii send (get) */ 1569 (void) alarm(curclass.timeout); 1570 while ((c = getc(instr)) != EOF) { 1571 byte_count++; 1572 if (c == '\n') { 1573 if (ferror(outstr)) 1574 goto data_err; 1575 (void) putc('\r', outstr); 1576 if (isdata) { 1577 total_data_out++; 1578 total_data++; 1579 } 1580 total_bytes_out++; 1581 total_bytes++; 1582 } 1583 (void) putc(c, outstr); 1584 if (isdata) { 1585 total_data_out++; 1586 total_data++; 1587 } 1588 total_bytes_out++; 1589 total_bytes++; 1590 if ((byte_count % 4096) == 0) 1591 (void) alarm(curclass.timeout); 1592 } 1593 (void) alarm(0); 1594 fflush(outstr); 1595 if (ferror(instr)) 1596 goto file_err; 1597 if (ferror(outstr)) 1598 goto data_err; 1599 rval = 0; 1600 goto cleanup_send_data; 1601 1602 case TYPE_I: 1603 case TYPE_L: 1604 if ((buf = malloc((size_t)blksize)) == NULL) { 1605 perror_reply(451, "Local resource failure: malloc"); 1606 goto cleanup_send_data; 1607 } 1608 filefd = fileno(instr); 1609 netfd = fileno(outstr); 1610 (void) alarm(curclass.timeout); 1611 if (curclass.rateget) { 1612 while (1) { 1613 int d; 1614 struct timeval then, now, td; 1615 off_t bufrem; 1616 char *bufp; 1617 1618 (void)gettimeofday(&then, NULL); 1619 errno = c = d = 0; 1620 bufrem = curclass.rateget; 1621 while (bufrem > 0) { 1622 if ((c = read(filefd, buf, 1623 MIN(blksize, bufrem))) <= 0) 1624 goto senddone; 1625 (void) alarm(curclass.timeout); 1626 bufrem -= c; 1627 byte_count += c; 1628 if (isdata) { 1629 total_data_out += c; 1630 total_data += c; 1631 } 1632 total_bytes_out += c; 1633 total_bytes += c; 1634 for (bufp = buf; c > 0; 1635 c -= d, bufp += d) 1636 if ((d = 1637 write(netfd, bufp, c)) <= 0) 1638 break; 1639 if (d < 0) 1640 goto data_err; 1641 } 1642 (void)gettimeofday(&now, NULL); 1643 timersub(&now, &then, &td); 1644 if (td.tv_sec == 0) 1645 usleep(1000000 - td.tv_usec); 1646 } 1647 } else { 1648 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1649 if (write(netfd, buf, c) != c) 1650 goto data_err; 1651 (void) alarm(curclass.timeout); 1652 byte_count += c; 1653 if (isdata) { 1654 total_data_out += c; 1655 total_data += c; 1656 } 1657 total_bytes_out += c; 1658 total_bytes += c; 1659 } 1660 } 1661 senddone: 1662 if (c < 0) 1663 goto file_err; 1664 rval = 0; 1665 goto cleanup_send_data; 1666 1667 default: 1668 reply(550, "Unimplemented TYPE %d in send_data", type); 1669 goto cleanup_send_data; 1670 } 1671 1672 data_err: 1673 (void) alarm(0); 1674 perror_reply(426, "Data connection"); 1675 goto cleanup_send_data; 1676 1677 file_err: 1678 (void) alarm(0); 1679 perror_reply(551, "Error on input file"); 1680 /* FALLTHROUGH */ 1681 1682 cleanup_send_data: 1683 (void) alarm(0); 1684 transflag = 0; 1685 if (buf) 1686 free(buf); 1687 if (isdata) { 1688 total_files_out++; 1689 total_files++; 1690 } 1691 total_xfers_out++; 1692 total_xfers++; 1693 return (rval); 1694 } 1695 1696 /* 1697 * Transfer data from peer to "outstr" using the appropriate encapulation of 1698 * the data subject to Mode, Structure, and Type. 1699 * 1700 * N.B.: Form isn't handled. 1701 */ 1702 static int 1703 receive_data(FILE *instr, FILE *outstr) 1704 { 1705 int c, bare_lfs, netfd, filefd, rval; 1706 off_t byteswritten; 1707 char buf[BUFSIZ]; 1708 #ifdef __GNUC__ 1709 (void) &bare_lfs; 1710 #endif 1711 1712 bare_lfs = 0; 1713 transflag = 1; 1714 rval = -1; 1715 byteswritten = 0; 1716 if (setjmp(urgcatch)) 1717 goto cleanup_recv_data; 1718 1719 #define FILESIZECHECK(x) \ 1720 do { \ 1721 if (curclass.maxfilesize != -1 && \ 1722 (x) > curclass.maxfilesize) { \ 1723 errno = EFBIG; \ 1724 goto file_err; \ 1725 } \ 1726 } while (0) 1727 1728 switch (type) { 1729 1730 case TYPE_I: 1731 case TYPE_L: 1732 netfd = fileno(instr); 1733 filefd = fileno(outstr); 1734 (void) alarm(curclass.timeout); 1735 if (curclass.rateput) { 1736 while (1) { 1737 int d; 1738 struct timeval then, now, td; 1739 off_t bufrem; 1740 1741 (void)gettimeofday(&then, NULL); 1742 errno = c = d = 0; 1743 for (bufrem = curclass.rateput; bufrem > 0; ) { 1744 if ((c = read(netfd, buf, 1745 MIN(sizeof(buf), bufrem))) <= 0) 1746 goto recvdone; 1747 FILESIZECHECK(byte_count + c); 1748 if ((d = write(filefd, buf, c)) != c) 1749 goto file_err; 1750 (void) alarm(curclass.timeout); 1751 bufrem -= c; 1752 byte_count += c; 1753 total_data_in += c; 1754 total_data += c; 1755 total_bytes_in += c; 1756 total_bytes += c; 1757 } 1758 (void)gettimeofday(&now, NULL); 1759 timersub(&now, &then, &td); 1760 if (td.tv_sec == 0) 1761 usleep(1000000 - td.tv_usec); 1762 } 1763 } else { 1764 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1765 FILESIZECHECK(byte_count + c); 1766 if (write(filefd, buf, c) != c) 1767 goto file_err; 1768 (void) alarm(curclass.timeout); 1769 byte_count += c; 1770 total_data_in += c; 1771 total_data += c; 1772 total_bytes_in += c; 1773 total_bytes += c; 1774 } 1775 } 1776 recvdone: 1777 if (c < 0) 1778 goto data_err; 1779 rval = 0; 1780 goto cleanup_recv_data; 1781 1782 case TYPE_E: 1783 reply(553, "TYPE E not implemented."); 1784 goto cleanup_recv_data; 1785 1786 case TYPE_A: 1787 (void) alarm(curclass.timeout); 1788 /* XXXLUKEM: rate limit ascii receive (put) */ 1789 while ((c = getc(instr)) != EOF) { 1790 byte_count++; 1791 total_data_in++; 1792 total_data++; 1793 total_bytes_in++; 1794 total_bytes++; 1795 if ((byte_count % 4096) == 0) 1796 (void) alarm(curclass.timeout); 1797 if (c == '\n') 1798 bare_lfs++; 1799 while (c == '\r') { 1800 if (ferror(outstr)) 1801 goto data_err; 1802 if ((c = getc(instr)) != '\n') { 1803 byte_count++; 1804 total_data_in++; 1805 total_data++; 1806 total_bytes_in++; 1807 total_bytes++; 1808 if ((byte_count % 4096) == 0) 1809 (void) alarm(curclass.timeout); 1810 byteswritten++; 1811 FILESIZECHECK(byteswritten); 1812 (void) putc ('\r', outstr); 1813 if (c == '\0' || c == EOF) 1814 goto contin2; 1815 } 1816 } 1817 byteswritten++; 1818 FILESIZECHECK(byteswritten); 1819 (void) putc(c, outstr); 1820 contin2: ; 1821 } 1822 (void) alarm(0); 1823 fflush(outstr); 1824 if (ferror(instr)) 1825 goto data_err; 1826 if (ferror(outstr)) 1827 goto file_err; 1828 if (bare_lfs) { 1829 reply(-226, 1830 "WARNING! %d bare linefeeds received in ASCII mode", 1831 bare_lfs); 1832 reply(0, "File may not have transferred correctly."); 1833 } 1834 rval = 0; 1835 goto cleanup_recv_data; 1836 1837 default: 1838 reply(550, "Unimplemented TYPE %d in receive_data", type); 1839 goto cleanup_recv_data; 1840 } 1841 #undef FILESIZECHECK 1842 1843 data_err: 1844 (void) alarm(0); 1845 perror_reply(426, "Data Connection"); 1846 goto cleanup_recv_data; 1847 1848 file_err: 1849 (void) alarm(0); 1850 perror_reply(452, "Error writing file"); 1851 goto cleanup_recv_data; 1852 1853 cleanup_recv_data: 1854 (void) alarm(0); 1855 transflag = 0; 1856 total_files_in++; 1857 total_files++; 1858 total_xfers_in++; 1859 total_xfers++; 1860 return (rval); 1861 } 1862 1863 void 1864 statcmd(void) 1865 { 1866 struct sockinet *su = NULL; 1867 static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 1868 u_char *a, *p; 1869 int ispassive, af; 1870 off_t otbi, otbo, otb; 1871 1872 a = p = (u_char *)NULL; 1873 1874 reply(-211, "%s FTP server status:", hostname); 1875 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 1876 hbuf[0] = '\0'; 1877 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 1878 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) 1879 && strcmp(remotehost, hbuf) != 0) 1880 reply(0, "Connected to %s (%s)", remotehost, hbuf); 1881 else 1882 reply(0, "Connected to %s", remotehost); 1883 1884 if (logged_in) { 1885 if (curclass.type == CLASS_GUEST) 1886 reply(0, "Logged in anonymously"); 1887 else 1888 reply(0, "Logged in as %s%s", pw->pw_name, 1889 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1890 } else if (askpasswd) 1891 reply(0, "Waiting for password"); 1892 else 1893 reply(0, "Waiting for user name"); 1894 cprintf(stdout, " TYPE: %s", typenames[type]); 1895 if (type == TYPE_A || type == TYPE_E) 1896 cprintf(stdout, ", FORM: %s", formnames[form]); 1897 if (type == TYPE_L) { 1898 #if NBBY == 8 1899 cprintf(stdout, " %d", NBBY); 1900 #else 1901 /* XXX: `bytesize' needs to be defined in this case */ 1902 cprintf(stdout, " %d", bytesize); 1903 #endif 1904 } 1905 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 1906 strunames[stru], modenames[mode]); 1907 ispassive = 0; 1908 if (data != -1) { 1909 reply(0, "Data connection open"); 1910 su = NULL; 1911 } else if (pdata != -1) { 1912 reply(0, "in Passive mode"); 1913 if (curclass.advertise.su_len != 0) 1914 su = &curclass.advertise; 1915 else 1916 su = &pasv_addr; 1917 ispassive = 1; 1918 goto printaddr; 1919 } else if (usedefault == 0) { 1920 if (epsvall) { 1921 reply(0, "EPSV only mode (EPSV ALL)"); 1922 goto epsvonly; 1923 } 1924 su = (struct sockinet *)&data_dest; 1925 printaddr: 1926 /* PASV/PORT */ 1927 if (su->su_family == AF_INET) { 1928 a = (u_char *) &su->su_addr; 1929 p = (u_char *) &su->su_port; 1930 #define UC(b) (((int) b) & 0xff) 1931 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 1932 ispassive ? "PASV" : "PORT" , 1933 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1934 UC(p[0]), UC(p[1])); 1935 } 1936 1937 /* LPSV/LPRT */ 1938 { 1939 int alen, af, i; 1940 1941 alen = 0; 1942 switch (su->su_family) { 1943 case AF_INET: 1944 a = (u_char *) &su->su_addr; 1945 p = (u_char *) &su->su_port; 1946 alen = sizeof(su->su_addr); 1947 af = 4; 1948 break; 1949 #ifdef INET6 1950 case AF_INET6: 1951 a = (u_char *) &su->su_6addr; 1952 p = (u_char *) &su->su_port; 1953 alen = sizeof(su->su_6addr); 1954 af = 6; 1955 break; 1956 #endif 1957 default: 1958 af = 0; 1959 break; 1960 } 1961 if (af) { 1962 cprintf(stdout, " %s (%d,%d", 1963 ispassive ? "LPSV" : "LPRT", af, alen); 1964 for (i = 0; i < alen; i++) 1965 cprintf(stdout, ",%d", UC(a[i])); 1966 cprintf(stdout, ",%d,%d,%d)\r\n", 1967 2, UC(p[0]), UC(p[1])); 1968 #undef UC 1969 } 1970 } 1971 1972 /* EPRT/EPSV */ 1973 epsvonly: 1974 af = af2epsvproto(su->su_family); 1975 hbuf[0] = '\0'; 1976 if (af > 0) { 1977 struct sockinet tmp; 1978 1979 tmp = *su; 1980 #ifdef INET6 1981 if (tmp.su_family == AF_INET6) 1982 tmp.su_scope_id = 0; 1983 #endif 1984 if (getnameinfo((struct sockaddr *)&tmp.si_su, 1985 tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 1986 NI_NUMERICHOST | NI_NUMERICSERV) == 0) 1987 reply(0, "%s (|%d|%s|%s|)", 1988 ispassive ? "EPSV" : "EPRT", 1989 af, hbuf, sbuf); 1990 } 1991 } else 1992 reply(0, "No data connection"); 1993 1994 if (logged_in) { 1995 reply(0, 1996 "Data sent: " LLF " byte%s in " LLF " file%s", 1997 (LLT)total_data_out, PLURAL(total_data_out), 1998 (LLT)total_files_out, PLURAL(total_files_out)); 1999 reply(0, 2000 "Data received: " LLF " byte%s in " LLF " file%s", 2001 (LLT)total_data_in, PLURAL(total_data_in), 2002 (LLT)total_files_in, PLURAL(total_files_in)); 2003 reply(0, 2004 "Total data: " LLF " byte%s in " LLF " file%s", 2005 (LLT)total_data, PLURAL(total_data), 2006 (LLT)total_files, PLURAL(total_files)); 2007 } 2008 otbi = total_bytes_in; 2009 otbo = total_bytes_out; 2010 otb = total_bytes; 2011 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 2012 (LLT)otbo, PLURAL(otbo), 2013 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 2014 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 2015 (LLT)otbi, PLURAL(otbi), 2016 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 2017 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 2018 (LLT)otb, PLURAL(otb), 2019 (LLT)total_xfers, PLURAL(total_xfers)); 2020 2021 if (logged_in) { 2022 struct ftpconv *cp; 2023 2024 reply(0, "%s", ""); 2025 reply(0, "Class: %s, type: %s", 2026 curclass.classname, CURCLASSTYPE); 2027 reply(0, "Check PORT/LPRT commands: %sabled", 2028 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 2029 if (! EMPTYSTR(curclass.display)) 2030 reply(0, "Display file: %s", curclass.display); 2031 if (! EMPTYSTR(curclass.notify)) 2032 reply(0, "Notify fileglob: %s", curclass.notify); 2033 reply(0, "Idle timeout: %d, maximum timeout: %d", 2034 curclass.timeout, curclass.maxtimeout); 2035 reply(0, "Current connections: %d", connections); 2036 if (curclass.limit == -1) 2037 reply(0, "Maximum connections: unlimited"); 2038 else 2039 reply(0, "Maximum connections: %d", curclass.limit); 2040 if (curclass.limitfile) 2041 reply(0, "Connection limit exceeded message file: %s", 2042 curclass.limitfile); 2043 if (! EMPTYSTR(curclass.chroot)) 2044 reply(0, "Chroot format: %s", curclass.chroot); 2045 if (! EMPTYSTR(curclass.homedir)) 2046 reply(0, "Homedir format: %s", curclass.homedir); 2047 if (curclass.maxfilesize == -1) 2048 reply(0, "Maximum file size: unlimited"); 2049 else 2050 reply(0, "Maximum file size: " LLF, 2051 (LLT)curclass.maxfilesize); 2052 if (! EMPTYSTR(curclass.motd)) 2053 reply(0, "MotD file: %s", curclass.motd); 2054 reply(0, 2055 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2056 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2057 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2058 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2059 reply(0, "Sanitize file names: %sabled", 2060 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2061 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2062 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2063 if (curclass.advertise.su_len != 0) { 2064 char buf[50]; /* big enough for IPv6 address */ 2065 const char *bp; 2066 2067 bp = inet_ntop(curclass.advertise.su_family, 2068 (void *)&curclass.advertise.su_addr, 2069 buf, sizeof(buf)); 2070 if (bp != NULL) 2071 reply(0, "PASV advertise address: %s", bp); 2072 } 2073 if (curclass.portmin && curclass.portmax) 2074 reply(0, "PASV port range: %d - %d", 2075 curclass.portmin, curclass.portmax); 2076 if (curclass.rateget) 2077 reply(0, "Rate get limit: " LLF " bytes/sec", 2078 (LLT)curclass.rateget); 2079 else 2080 reply(0, "Rate get limit: disabled"); 2081 if (curclass.rateput) 2082 reply(0, "Rate put limit: " LLF " bytes/sec", 2083 (LLT)curclass.rateput); 2084 else 2085 reply(0, "Rate put limit: disabled"); 2086 reply(0, "Umask: %.04o", curclass.umask); 2087 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2088 if (cp->suffix == NULL || cp->types == NULL || 2089 cp->command == NULL) 2090 continue; 2091 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2092 cp->suffix, cp->types, cp->disable, cp->command); 2093 } 2094 } 2095 2096 reply(211, "End of status"); 2097 } 2098 2099 void 2100 fatal(const char *s) 2101 { 2102 2103 reply(451, "Error in server: %s\n", s); 2104 reply(221, "Closing connection due to server error."); 2105 dologout(0); 2106 /* NOTREACHED */ 2107 } 2108 2109 /* 2110 * reply() -- 2111 * depending on the value of n, display fmt with a trailing CRLF and 2112 * prefix of: 2113 * n < -1 prefix the message with abs(n) + "-" (initial line) 2114 * n == 0 prefix the message with 4 spaces (middle lines) 2115 * n > 0 prefix the message with n + " " (final line) 2116 */ 2117 void 2118 reply(int n, const char *fmt, ...) 2119 { 2120 off_t b; 2121 va_list ap; 2122 2123 va_start(ap, fmt); 2124 b = 0; 2125 if (n == 0) 2126 cprintf(stdout, " "); 2127 else if (n < 0) 2128 cprintf(stdout, "%d-", -n); 2129 else 2130 cprintf(stdout, "%d ", n); 2131 b = vprintf(fmt, ap); 2132 total_bytes += b; 2133 total_bytes_out += b; 2134 cprintf(stdout, "\r\n"); 2135 (void)fflush(stdout); 2136 if (debug) { 2137 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 2138 vsyslog(LOG_DEBUG, fmt, ap); 2139 } 2140 } 2141 2142 static void 2143 logremotehost(struct sockinet *who) 2144 { 2145 2146 if (getnameinfo((struct sockaddr *)&who->si_su, 2147 who->su_len, remotehost, sizeof(remotehost), NULL, 0, 0)) 2148 strlcpy(remotehost, "?", sizeof(remotehost)); 2149 2150 #if HAVE_SETPROCTITLE 2151 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2152 setproctitle("%s", proctitle); 2153 #endif /* HAVE_SETPROCTITLE */ 2154 if (logging) 2155 syslog(LOG_INFO, "connection from %s to %s", 2156 remotehost, hostname); 2157 } 2158 2159 /* 2160 * Record logout in wtmp file and exit with supplied status. 2161 */ 2162 void 2163 dologout(int status) 2164 { 2165 /* 2166 * Prevent reception of SIGURG from resulting in a resumption 2167 * back to the main program loop. 2168 */ 2169 transflag = 0; 2170 2171 if (logged_in) { 2172 if (dowtmp) 2173 logwtmp(ttyline, "", ""); 2174 if (doutmp) 2175 logout(utmp.ut_line); 2176 #ifdef KERBEROS 2177 if (!notickets && krbtkfile_env) 2178 unlink(krbtkfile_env); 2179 #endif 2180 } 2181 /* beware of flushing buffers after a SIGPIPE */ 2182 _exit(status); 2183 } 2184 2185 void 2186 abor(void) 2187 { 2188 2189 tmpline[0] = '\0'; 2190 is_oob = 0; 2191 reply(426, "Transfer aborted. Data connection closed."); 2192 reply(226, "Abort successful"); 2193 longjmp(urgcatch, 1); 2194 } 2195 2196 void 2197 statxfer(void) 2198 { 2199 2200 tmpline[0] = '\0'; 2201 is_oob = 0; 2202 if (file_size != (off_t) -1) 2203 reply(213, 2204 "Status: " LLF " of " LLF " byte%s transferred", 2205 (LLT)byte_count, (LLT)file_size, 2206 PLURAL(byte_count)); 2207 else 2208 reply(213, "Status: " LLF " byte%s transferred", 2209 (LLT)byte_count, PLURAL(byte_count)); 2210 } 2211 2212 static void 2213 myoob(int signo) 2214 { 2215 char *cp; 2216 2217 /* only process if transfer occurring */ 2218 if (!transflag) 2219 return; 2220 cp = tmpline; 2221 if (getline(cp, sizeof(tmpline), stdin) == NULL) { 2222 reply(221, "You could at least say goodbye."); 2223 dologout(0); 2224 } 2225 is_oob = 1; 2226 ftp_handle_line(cp); 2227 is_oob = 0; 2228 } 2229 2230 static int 2231 bind_pasv_addr(void) 2232 { 2233 static int passiveport; 2234 int port, len; 2235 2236 len = pasv_addr.su_len; 2237 if (curclass.portmin == 0 && curclass.portmax == 0) { 2238 pasv_addr.su_port = 0; 2239 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2240 } 2241 2242 if (passiveport == 0) { 2243 srand(getpid()); 2244 passiveport = rand() % (curclass.portmax - curclass.portmin) 2245 + curclass.portmin; 2246 } 2247 2248 port = passiveport; 2249 while (1) { 2250 port++; 2251 if (port > curclass.portmax) 2252 port = curclass.portmin; 2253 else if (port == passiveport) { 2254 errno = EAGAIN; 2255 return (-1); 2256 } 2257 pasv_addr.su_port = htons(port); 2258 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 2259 break; 2260 if (errno != EADDRINUSE) 2261 return (-1); 2262 } 2263 passiveport = port; 2264 return (0); 2265 } 2266 2267 /* 2268 * Note: a response of 425 is not mentioned as a possible response to 2269 * the PASV command in RFC959. However, it has been blessed as 2270 * a legitimate response by Jon Postel in a telephone conversation 2271 * with Rick Adams on 25 Jan 89. 2272 */ 2273 void 2274 passive(void) 2275 { 2276 int len; 2277 char *p, *a; 2278 2279 if (pdata >= 0) 2280 close(pdata); 2281 pdata = socket(AF_INET, SOCK_STREAM, 0); 2282 if (pdata < 0 || !logged_in) { 2283 perror_reply(425, "Can't open passive connection"); 2284 return; 2285 } 2286 pasv_addr = ctrl_addr; 2287 2288 if (bind_pasv_addr() < 0) 2289 goto pasv_error; 2290 len = pasv_addr.su_len; 2291 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2292 goto pasv_error; 2293 pasv_addr.su_len = len; 2294 if (listen(pdata, 1) < 0) 2295 goto pasv_error; 2296 if (curclass.advertise.su_len != 0) 2297 a = (char *) &curclass.advertise.su_addr; 2298 else 2299 a = (char *) &pasv_addr.su_addr; 2300 p = (char *) &pasv_addr.su_port; 2301 2302 #define UC(b) (((int) b) & 0xff) 2303 2304 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2305 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2306 return; 2307 2308 pasv_error: 2309 (void) close(pdata); 2310 pdata = -1; 2311 perror_reply(425, "Can't open passive connection"); 2312 return; 2313 } 2314 2315 /* 2316 * convert protocol identifier to/from AF 2317 */ 2318 int 2319 lpsvproto2af(int proto) 2320 { 2321 2322 switch (proto) { 2323 case 4: 2324 return AF_INET; 2325 #ifdef INET6 2326 case 6: 2327 return AF_INET6; 2328 #endif 2329 default: 2330 return -1; 2331 } 2332 } 2333 2334 int 2335 af2lpsvproto(int af) 2336 { 2337 2338 switch (af) { 2339 case AF_INET: 2340 return 4; 2341 #ifdef INET6 2342 case AF_INET6: 2343 return 6; 2344 #endif 2345 default: 2346 return -1; 2347 } 2348 } 2349 2350 int 2351 epsvproto2af(int proto) 2352 { 2353 2354 switch (proto) { 2355 case 1: 2356 return AF_INET; 2357 #ifdef INET6 2358 case 2: 2359 return AF_INET6; 2360 #endif 2361 default: 2362 return -1; 2363 } 2364 } 2365 2366 int 2367 af2epsvproto(int af) 2368 { 2369 2370 switch (af) { 2371 case AF_INET: 2372 return 1; 2373 #ifdef INET6 2374 case AF_INET6: 2375 return 2; 2376 #endif 2377 default: 2378 return -1; 2379 } 2380 } 2381 2382 /* 2383 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2384 * 229 Entering Extended Passive Mode (|||port|) 2385 */ 2386 void 2387 long_passive(char *cmd, int pf) 2388 { 2389 int len; 2390 char *p, *a; 2391 2392 if (!logged_in) { 2393 syslog(LOG_NOTICE, "long passive but not logged in"); 2394 reply(503, "Login with USER first."); 2395 return; 2396 } 2397 2398 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2399 /* 2400 * XXX: only EPRT/EPSV ready clients will understand this 2401 */ 2402 if (strcmp(cmd, "EPSV") != 0) 2403 reply(501, "Network protocol mismatch"); /*XXX*/ 2404 else 2405 epsv_protounsupp("Network protocol mismatch"); 2406 2407 return; 2408 } 2409 2410 if (pdata >= 0) 2411 close(pdata); 2412 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2413 if (pdata < 0) { 2414 perror_reply(425, "Can't open passive connection"); 2415 return; 2416 } 2417 pasv_addr = ctrl_addr; 2418 if (bind_pasv_addr() < 0) 2419 goto pasv_error; 2420 len = pasv_addr.su_len; 2421 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2422 goto pasv_error; 2423 pasv_addr.su_len = len; 2424 if (listen(pdata, 1) < 0) 2425 goto pasv_error; 2426 p = (char *) &pasv_addr.su_port; 2427 2428 #define UC(b) (((int) b) & 0xff) 2429 2430 if (strcmp(cmd, "LPSV") == 0) { 2431 struct sockinet *advert; 2432 2433 if (curclass.advertise.su_len != 0) 2434 advert = &curclass.advertise; 2435 else 2436 advert = &pasv_addr; 2437 switch (advert->su_family) { 2438 case AF_INET: 2439 a = (char *) &advert->su_addr; 2440 reply(228, 2441 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2442 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2443 2, UC(p[0]), UC(p[1])); 2444 return; 2445 #ifdef INET6 2446 case AF_INET6: 2447 a = (char *) &advert->su_6addr; 2448 reply(228, 2449 "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)", 2450 6, 16, 2451 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2452 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2453 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2454 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2455 2, UC(p[0]), UC(p[1])); 2456 return; 2457 #endif 2458 } 2459 #undef UC 2460 } else if (strcmp(cmd, "EPSV") == 0) { 2461 switch (pasv_addr.su_family) { 2462 case AF_INET: 2463 #ifdef INET6 2464 case AF_INET6: 2465 #endif 2466 reply(229, "Entering Extended Passive Mode (|||%d|)", 2467 ntohs(pasv_addr.su_port)); 2468 return; 2469 } 2470 } else { 2471 /* more proper error code? */ 2472 } 2473 2474 pasv_error: 2475 (void) close(pdata); 2476 pdata = -1; 2477 perror_reply(425, "Can't open passive connection"); 2478 return; 2479 } 2480 2481 int 2482 extended_port(const char *arg) 2483 { 2484 char *tmp = NULL; 2485 char *result[3]; 2486 char *p, *q; 2487 char delim; 2488 struct addrinfo hints; 2489 struct addrinfo *res = NULL; 2490 int i; 2491 unsigned long proto; 2492 2493 tmp = xstrdup(arg); 2494 p = tmp; 2495 delim = p[0]; 2496 p++; 2497 memset(result, 0, sizeof(result)); 2498 for (i = 0; i < 3; i++) { 2499 q = strchr(p, delim); 2500 if (!q || *q != delim) 2501 goto parsefail; 2502 *q++ = '\0'; 2503 result[i] = p; 2504 p = q; 2505 } 2506 2507 /* some more sanity checks */ 2508 p = NULL; 2509 (void)strtoul(result[2], &p, 10); 2510 if (!*result[2] || *p) 2511 goto parsefail; 2512 p = NULL; 2513 proto = strtoul(result[0], &p, 10); 2514 if (!*result[0] || *p) 2515 goto protounsupp; 2516 2517 memset(&hints, 0, sizeof(hints)); 2518 hints.ai_family = epsvproto2af((int)proto); 2519 if (hints.ai_family < 0) 2520 goto protounsupp; 2521 hints.ai_socktype = SOCK_STREAM; 2522 hints.ai_flags = AI_NUMERICHOST; 2523 if (getaddrinfo(result[1], result[2], &hints, &res)) 2524 goto parsefail; 2525 if (res->ai_next) 2526 goto parsefail; 2527 if (sizeof(data_dest) < res->ai_addrlen) 2528 goto parsefail; 2529 memcpy(&data_dest.si_su, res->ai_addr, res->ai_addrlen); 2530 data_dest.su_len = res->ai_addrlen; 2531 #ifdef INET6 2532 if (his_addr.su_family == AF_INET6 && 2533 data_dest.su_family == AF_INET6) { 2534 /* XXX: more sanity checks! */ 2535 data_dest.su_scope_id = his_addr.su_scope_id; 2536 } 2537 #endif 2538 2539 if (tmp != NULL) 2540 free(tmp); 2541 if (res) 2542 freeaddrinfo(res); 2543 return 0; 2544 2545 parsefail: 2546 reply(500, "Invalid argument, rejected."); 2547 usedefault = 1; 2548 if (tmp != NULL) 2549 free(tmp); 2550 if (res) 2551 freeaddrinfo(res); 2552 return -1; 2553 2554 protounsupp: 2555 epsv_protounsupp("Protocol not supported"); 2556 usedefault = 1; 2557 if (tmp != NULL) 2558 free(tmp); 2559 if (res) 2560 freeaddrinfo(res); 2561 return -1; 2562 } 2563 2564 /* 2565 * 522 Protocol not supported (proto,...) 2566 * as we assume address family for control and data connections are the same, 2567 * we do not return the list of address families we support - instead, we 2568 * return the address family of the control connection. 2569 */ 2570 void 2571 epsv_protounsupp(const char *message) 2572 { 2573 int proto; 2574 2575 proto = af2epsvproto(ctrl_addr.su_family); 2576 if (proto < 0) 2577 reply(501, "%s", message); /* XXX */ 2578 else 2579 reply(522, "%s, use (%d)", message, proto); 2580 } 2581 2582 /* 2583 * Generate unique name for file with basename "local". 2584 * The file named "local" is already known to exist. 2585 * Generates failure reply on error. 2586 * 2587 * XXX: this function should under go changes similar to 2588 * the mktemp(3)/mkstemp(3) changes. 2589 */ 2590 static char * 2591 gunique(const char *local) 2592 { 2593 static char new[MAXPATHLEN]; 2594 struct stat st; 2595 char *cp; 2596 int count; 2597 2598 cp = strrchr(local, '/'); 2599 if (cp) 2600 *cp = '\0'; 2601 if (stat(cp ? local : ".", &st) < 0) { 2602 perror_reply(553, cp ? local : "."); 2603 return (NULL); 2604 } 2605 if (cp) 2606 *cp = '/'; 2607 for (count = 1; count < 100; count++) { 2608 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2609 if (stat(new, &st) < 0) 2610 return (new); 2611 } 2612 reply(452, "Unique file name cannot be created."); 2613 return (NULL); 2614 } 2615 2616 /* 2617 * Format and send reply containing system error number. 2618 */ 2619 void 2620 perror_reply(int code, const char *string) 2621 { 2622 int save_errno; 2623 2624 save_errno = errno; 2625 reply(code, "%s: %s.", string, strerror(errno)); 2626 errno = save_errno; 2627 } 2628 2629 static char *onefile[] = { 2630 "", 2631 0 2632 }; 2633 2634 void 2635 send_file_list(const char *whichf) 2636 { 2637 struct stat st; 2638 DIR *dirp = NULL; 2639 struct dirent *dir; 2640 FILE *dout = NULL; 2641 char **dirlist, *dirname, *p; 2642 int simple = 0; 2643 int freeglob = 0; 2644 glob_t gl; 2645 2646 #ifdef __GNUC__ 2647 (void) &dout; 2648 (void) &dirlist; 2649 (void) &simple; 2650 (void) &freeglob; 2651 #endif 2652 2653 p = NULL; 2654 if (strpbrk(whichf, "~{[*?") != NULL) { 2655 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; 2656 2657 memset(&gl, 0, sizeof(gl)); 2658 freeglob = 1; 2659 if (glob(whichf, flags, 0, &gl)) { 2660 reply(550, "not found"); 2661 goto out; 2662 } else if (gl.gl_pathc == 0) { 2663 errno = ENOENT; 2664 perror_reply(550, whichf); 2665 goto out; 2666 } 2667 dirlist = gl.gl_pathv; 2668 } else { 2669 p = xstrdup(whichf); 2670 onefile[0] = p; 2671 dirlist = onefile; 2672 simple = 1; 2673 } 2674 /* XXX: } for vi sm */ 2675 2676 if (setjmp(urgcatch)) { 2677 transflag = 0; 2678 goto out; 2679 } 2680 while ((dirname = *dirlist++) != NULL) { 2681 int trailingslash = 0; 2682 2683 if (stat(dirname, &st) < 0) { 2684 /* 2685 * If user typed "ls -l", etc, and the client 2686 * used NLST, do what the user meant. 2687 */ 2688 /* XXX: nuke this support? */ 2689 if (dirname[0] == '-' && *dirlist == NULL && 2690 transflag == 0) { 2691 char *argv[] = { INTERNAL_LS, "", NULL }; 2692 2693 argv[1] = dirname; 2694 retrieve(argv, dirname); 2695 goto out; 2696 } 2697 perror_reply(550, whichf); 2698 goto cleanup_send_file_list; 2699 } 2700 2701 if (S_ISREG(st.st_mode)) { 2702 /* 2703 * XXXRFC: 2704 * should we follow RFC959 and not work 2705 * for non directories? 2706 */ 2707 if (dout == NULL) { 2708 dout = dataconn("file list", (off_t)-1, "w"); 2709 if (dout == NULL) 2710 goto out; 2711 transflag++; 2712 } 2713 cprintf(dout, "%s%s\n", dirname, 2714 type == TYPE_A ? "\r" : ""); 2715 continue; 2716 } else if (!S_ISDIR(st.st_mode)) 2717 continue; 2718 2719 if (dirname[strlen(dirname) - 1] == '/') 2720 trailingslash++; 2721 2722 if ((dirp = opendir(dirname)) == NULL) 2723 continue; 2724 2725 while ((dir = readdir(dirp)) != NULL) { 2726 char nbuf[MAXPATHLEN]; 2727 2728 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2729 continue; 2730 2731 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2732 trailingslash ? "" : "/", dir->d_name); 2733 2734 /* 2735 * We have to do a stat to ensure it's 2736 * not a directory or special file. 2737 */ 2738 /* 2739 * XXXRFC: 2740 * should we follow RFC959 and filter out 2741 * non files ? lukem - NO!, or not until 2742 * our ftp client uses MLS{T,D} for completion. 2743 */ 2744 if (simple || (stat(nbuf, &st) == 0 && 2745 S_ISREG(st.st_mode))) { 2746 char *p; 2747 2748 if (dout == NULL) { 2749 dout = dataconn("file list", (off_t)-1, 2750 "w"); 2751 if (dout == NULL) 2752 goto out; 2753 transflag++; 2754 } 2755 p = nbuf; 2756 if (nbuf[0] == '.' && nbuf[1] == '/') 2757 p = &nbuf[2]; 2758 cprintf(dout, "%s%s\n", p, 2759 type == TYPE_A ? "\r" : ""); 2760 } 2761 } 2762 (void) closedir(dirp); 2763 } 2764 2765 if (dout == NULL) 2766 reply(550, "No files found."); 2767 else if (ferror(dout) != 0) 2768 perror_reply(550, "Data connection"); 2769 else 2770 reply(226, "Transfer complete."); 2771 2772 cleanup_send_file_list: 2773 transflag = 0; 2774 closedataconn(dout); 2775 out: 2776 total_xfers++; 2777 total_xfers_out++; 2778 if (p) 2779 free(p); 2780 if (freeglob) 2781 globfree(&gl); 2782 } 2783 2784 char * 2785 conffilename(const char *s) 2786 { 2787 static char filename[MAXPATHLEN]; 2788 2789 if (*s == '/') 2790 strlcpy(filename, s, sizeof(filename)); 2791 else 2792 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2793 return (filename); 2794 } 2795 2796 /* 2797 * logxfer -- 2798 * if logging > 1, then based on the arguments, syslog a message: 2799 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2800 * else if file2 != NULL "<command> <file1> <file2>" 2801 * else "<command> <file1>" 2802 * if elapsed != NULL, append "in xxx.yyy seconds" 2803 * if error != NULL, append ": " + error 2804 * 2805 * if doxferlog != 0, syslog a wu-ftpd style xferlog entry 2806 */ 2807 void 2808 logxfer(const char *command, off_t bytes, const char *file1, const char *file2, 2809 const struct timeval *elapsed, const char *error) 2810 { 2811 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2812 const char *r1, *r2; 2813 char direction; 2814 size_t len; 2815 time_t now; 2816 2817 if (logging <=1 && !doxferlog) 2818 return; 2819 2820 r1 = r2 = NULL; 2821 if ((r1 = realpath(file1, realfile)) == NULL) 2822 r1 = file1; 2823 if (file2 != NULL) 2824 if ((r2 = realpath(file2, realfile)) == NULL) 2825 r2 = file2; 2826 2827 /* 2828 * syslog command 2829 */ 2830 if (logging > 1) { 2831 len = snprintf(buf, sizeof(buf), "%s %s", command, r1); 2832 if (bytes != (off_t)-1) 2833 len += snprintf(buf + len, sizeof(buf) - len, 2834 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 2835 else if (r2 != NULL) 2836 len += snprintf(buf + len, sizeof(buf) - len, 2837 " %s", r2); 2838 if (elapsed != NULL) 2839 len += snprintf(buf + len, sizeof(buf) - len, 2840 " in %ld.%.03d seconds", elapsed->tv_sec, 2841 (int)(elapsed->tv_usec / 1000)); 2842 if (error != NULL) 2843 len += snprintf(buf + len, sizeof(buf) - len, 2844 ": %s", error); 2845 syslog(LOG_INFO, "%s", buf); 2846 } 2847 2848 2849 /* 2850 * syslog wu-ftpd style log entry, prefixed with "xferlog: " 2851 */ 2852 if (!doxferlog) 2853 return; 2854 2855 if (strcmp(command, "get") == 0) 2856 direction = 'o'; 2857 else if (strcmp(command, "put") == 0 || strcmp(command, "append") == 0) 2858 direction = 'i'; 2859 else 2860 return; 2861 2862 time(&now); 2863 syslog(LOG_INFO, 2864 "xferlog%s: %.24s %ld %s " LLF " %s %c %s %c %c %s FTP 0 * %c", 2865 2866 /* 2867 * XXX: wu-ftpd puts (send) or (recv) in the syslog message, and removes 2868 * the full date. This may be problematic for accurate log parsing, 2869 * given that syslog messages don't contain the full date. 2870 */ 2871 #if 1 /* lukem's method; easier to convert to actual xferlog file */ 2872 "", 2873 ctime(&now), 2874 #else /* wu-ftpd's syslog method, with an extra unneeded space */ 2875 (direction == 'i') ? " (recv)" : " (send)", 2876 "", 2877 #endif 2878 elapsed == NULL ? 0 : elapsed->tv_sec + (elapsed->tv_usec > 0), 2879 remotehost, 2880 bytes == (off_t)-1 ? 0 : (LLT) bytes, 2881 r1, 2882 type == TYPE_A ? 'a' : 'b', 2883 "_", /* XXX: take conversions into account? */ 2884 direction, 2885 2886 curclass.type == CLASS_GUEST ? 'a' : 2887 curclass.type == CLASS_CHROOT ? 'g' : 2888 curclass.type == CLASS_REAL ? 'r' : '?', 2889 2890 curclass.type == CLASS_GUEST ? pw->pw_passwd : pw->pw_name, 2891 error != NULL ? 'i' : 'c' 2892 ); 2893 } 2894 2895 /* 2896 * Determine if `password' is valid for user given in `pw'. 2897 * Returns 2 if password expired, 1 if otherwise failed, 0 if ok 2898 */ 2899 int 2900 checkpassword(const struct passwd *pw, const char *password) 2901 { 2902 char *orig, *new; 2903 time_t expire; 2904 2905 expire = 0; 2906 if (pw == NULL) 2907 return 1; 2908 2909 orig = pw->pw_passwd; /* save existing password */ 2910 expire = pw->pw_expire; 2911 2912 if (orig[0] == '\0') /* don't allow empty passwords */ 2913 return 1; 2914 2915 new = crypt(password, orig); /* encrypt given password */ 2916 if (strcmp(new, orig) != 0) /* compare */ 2917 return 1; 2918 2919 if (expire && time(NULL) >= expire) 2920 return 2; /* check if expired */ 2921 2922 return 0; /* OK! */ 2923 } 2924 2925 char * 2926 xstrdup(const char *s) 2927 { 2928 char *new = strdup(s); 2929 2930 if (new == NULL) 2931 fatal("Local resource failure: malloc"); 2932 /* NOTREACHED */ 2933 return (new); 2934 } 2935 2936 /* 2937 * As per fprintf(), but increment total_bytes and total_bytes_out, 2938 * by the appropriate amount. 2939 */ 2940 void 2941 cprintf(FILE *fd, const char *fmt, ...) 2942 { 2943 off_t b; 2944 va_list ap; 2945 2946 va_start(ap, fmt); 2947 b = vfprintf(fd, fmt, ap); 2948 total_bytes += b; 2949 total_bytes_out += b; 2950 } 2951
Indexes created Sat Sep 27 22:09:54 GMT 2025