ftpd.c revision 1.121
1 /* $NetBSD: ftpd.c,v 1.121 2001/02/04 22:04:12 christos 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 1.121 2001/02/04 22:04:12 christos 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 version = FTPD_VERSION; 263 264 /* 265 * LOG_NDELAY sets up the logging connection immediately, 266 * necessary for anonymous ftp's that chroot and can't do it later. 267 */ 268 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 269 270 while ((ch = getopt(argc, argv, "a:c:C:de:h:HlP:qQrst:T:uUvV:wWX")) 271 != -1) { 272 switch (ch) { 273 case 'a': 274 anondir = optarg; 275 break; 276 277 case 'c': 278 confdir = optarg; 279 break; 280 281 case 'C': 282 pw = sgetpwnam(optarg); 283 exit(checkaccess(optarg) ? 0 : 1); 284 /* NOTREACHED */ 285 286 case 'd': 287 case 'v': /* deprecated */ 288 debug = 1; 289 break; 290 291 case 'e': 292 emailaddr = optarg; 293 break; 294 295 case 'h': 296 strlcpy(hostname, optarg, sizeof(hostname)); 297 break; 298 299 case 'H': 300 if (gethostname(hostname, sizeof(hostname)) == -1) 301 hostname[0] = '\0'; 302 hostname[sizeof(hostname) - 1] = '\0'; 303 break; 304 305 case 'l': 306 logging++; /* > 1 == extra logging */ 307 break; 308 309 case 'P': 310 dataport = (int)strtol(optarg, &p, 10); 311 if (*p != '\0' || dataport < IPPORT_RESERVED || 312 dataport > IPPORT_ANONMAX) { 313 syslog(LOG_WARNING, "Invalid dataport %s", 314 optarg); 315 dataport = 0; 316 } 317 break; 318 319 case 'q': 320 dopidfile = 1; 321 break; 322 323 case 'Q': 324 dopidfile = 0; 325 break; 326 327 case 'r': 328 dropprivs = 1; 329 break; 330 331 case 's': 332 sflag = 1; 333 break; 334 335 case 't': 336 case 'T': 337 syslog(LOG_WARNING, 338 "-%c has been deprecated in favour of ftpd.conf", 339 ch); 340 break; 341 342 case 'u': 343 doutmp = 1; 344 break; 345 346 case 'U': 347 doutmp = 0; 348 break; 349 350 case 'V': 351 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 352 version = NULL; 353 else 354 version = xstrdup(optarg); 355 break; 356 357 case 'w': 358 dowtmp = 1; 359 break; 360 361 case 'W': 362 dowtmp = 0; 363 break; 364 365 case 'X': 366 doxferlog = 1; 367 break; 368 369 default: 370 if (optopt == 'a' || optopt == 'C') 371 exit(1); 372 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 373 break; 374 } 375 } 376 if (EMPTYSTR(confdir)) 377 confdir = _DEFAULT_CONFDIR; 378 379 memset((char *)&his_addr, 0, sizeof(his_addr)); 380 addrlen = sizeof(his_addr.si_su); 381 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 382 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 383 exit(1); 384 } 385 his_addr.su_len = addrlen; 386 memset((char *)&ctrl_addr, 0, sizeof(ctrl_addr)); 387 addrlen = sizeof(ctrl_addr.si_su); 388 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 389 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 390 exit(1); 391 } 392 ctrl_addr.su_len = addrlen; 393 #ifdef INET6 394 if (his_addr.su_family == AF_INET6 395 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 396 #if 1 397 /* 398 * IPv4 control connection arrived to AF_INET6 socket. 399 * I hate to do this, but this is the easiest solution. 400 * 401 * The assumption is untrue on SIIT environment. 402 */ 403 struct sockinet tmp_addr; 404 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 405 406 tmp_addr = his_addr; 407 memset(&his_addr, 0, sizeof(his_addr)); 408 his_addr.su_family = AF_INET; 409 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 410 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 411 sizeof(his_addr.su_addr)); 412 his_addr.su_port = tmp_addr.su_port; 413 414 tmp_addr = ctrl_addr; 415 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 416 ctrl_addr.su_family = AF_INET; 417 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 418 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 419 sizeof(ctrl_addr.su_addr)); 420 ctrl_addr.su_port = tmp_addr.su_port; 421 #else 422 while (fgets(line, sizeof(line), fd) != NULL) { 423 if ((cp = strchr(line, '\n')) != NULL) 424 *cp = '\0'; 425 reply(-530, "%s", line); 426 } 427 (void) fflush(stdout); 428 (void) fclose(fd); 429 reply(530, 430 "Connection from IPv4 mapped address is not supported."); 431 exit(0); 432 #endif 433 434 mapped = 1; 435 } else 436 #endif /* INET6 */ 437 mapped = 0; 438 #ifdef IP_TOS 439 if (!mapped && his_addr.su_family == AF_INET) { 440 tos = IPTOS_LOWDELAY; 441 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 442 sizeof(int)) < 0) 443 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 444 } 445 #endif 446 /* if the hostname hasn't been given, attempt to determine it */ 447 if (hostname[0] == '\0') { 448 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 449 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 0) 450 != 0) 451 (void)gethostname(hostname, sizeof(hostname)); 452 hostname[sizeof(hostname) - 1] = '\0'; 453 } 454 455 /* set this here so klogin can use it... */ 456 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 457 458 (void) freopen(_PATH_DEVNULL, "w", stderr); 459 (void) signal(SIGPIPE, lostconn); 460 (void) signal(SIGCHLD, SIG_IGN); 461 if (signal(SIGURG, myoob) == SIG_ERR) 462 syslog(LOG_WARNING, "signal: %m"); 463 464 /* Try to handle urgent data inline */ 465 #ifdef SO_OOBINLINE 466 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 467 syslog(LOG_WARNING, "setsockopt: %m"); 468 #endif 469 /* Set keepalives on the socket to detect dropped connections. */ 470 #ifdef SO_KEEPALIVE 471 keepalive = 1; 472 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 473 sizeof(int)) < 0) 474 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 475 #endif 476 477 #ifdef F_SETOWN 478 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 479 syslog(LOG_WARNING, "fcntl F_SETOWN: %m"); 480 #endif 481 logremotehost(&his_addr); 482 /* 483 * Set up default state 484 */ 485 data = -1; 486 type = TYPE_A; 487 form = FORM_N; 488 stru = STRU_F; 489 mode = MODE_S; 490 tmpline[0] = '\0'; 491 hasyyerrored = 0; 492 493 #ifdef KERBEROS5 494 kerror = krb5_init_context(&kcontext); 495 if (kerror) { 496 syslog(LOG_ERR, "%s when initializing Kerberos context", 497 error_message(kerror)); 498 exit(0); 499 } 500 #endif /* KERBEROS5 */ 501 502 init_curclass(); 503 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 504 curclass.type = CLASS_REAL; 505 506 /* If logins are disabled, print out the message. */ 507 if (display_file(_PATH_NOLOGIN, 530)) { 508 reply(530, "System not available."); 509 exit(0); 510 } 511 (void)display_file(conffilename(_PATH_FTPWELCOME), 220); 512 /* reply(220,) must follow */ 513 if (EMPTYSTR(version)) 514 reply(220, "%s FTP server ready.", hostname); 515 else 516 reply(220, "%s FTP server (%s) ready.", hostname, version); 517 518 (void) setjmp(errcatch); 519 for (;;) 520 (void) yyparse(); 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 compatability, `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, 1130 (int) (sizeof(proctitle) - sizeof(remotehost) - 1131 sizeof(": anonymous/")), passwd); 1132 setproctitle("%s", proctitle); 1133 #endif /* HAVE_SETPROCTITLE */ 1134 if (logging) 1135 syslog(LOG_INFO, 1136 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1137 remotehost, passwd, 1138 curclass.classname, CURCLASSTYPE); 1139 /* store guest password reply into pw_passwd */ 1140 REASSIGN(pw->pw_passwd, xstrdup(passwd)); 1141 for (p = pw->pw_passwd; *p; p++) 1142 if (!isgraph(*p)) 1143 *p = '_'; 1144 } else { 1145 reply(230, "User %s logged in.", pw->pw_name); 1146 #if HAVE_SETPROCTITLE 1147 snprintf(proctitle, sizeof(proctitle), 1148 "%s: %s", remotehost, pw->pw_name); 1149 setproctitle("%s", proctitle); 1150 #endif /* HAVE_SETPROCTITLE */ 1151 if (logging) 1152 syslog(LOG_INFO, 1153 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1154 remotehost, pw->pw_name, 1155 curclass.classname, CURCLASSTYPE); 1156 } 1157 (void) umask(curclass.umask); 1158 goto cleanuppass; 1159 1160 bad: 1161 /* Forget all about it... */ 1162 end_login(); 1163 1164 cleanuppass: 1165 if (class) 1166 free(class); 1167 } 1168 1169 void 1170 retrieve(char *argv[], const char *name) 1171 { 1172 FILE *fin, *dout; 1173 struct stat st; 1174 int (*closefunc)(FILE *) = NULL; 1175 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1176 struct timeval start, finish, td, *tdp; 1177 const char *dispname; 1178 1179 sendrv = closerv = stderrfd = -1; 1180 isconversion = isdata = isls = log = 0; 1181 tdp = NULL; 1182 dispname = name; 1183 fin = dout = NULL; 1184 if (argv == NULL) { /* if not running a command ... */ 1185 log = 1; 1186 isdata = 1; 1187 fin = fopen(name, "r"); 1188 closefunc = fclose; 1189 if (fin == NULL) /* doesn't exist?; try a conversion */ 1190 argv = do_conversion(name); 1191 if (argv != NULL) { 1192 isconversion++; 1193 syslog(LOG_DEBUG, "get command: '%s' on '%s'", 1194 argv[0], name); 1195 } 1196 } 1197 if (argv != NULL) { 1198 char temp[MAXPATHLEN]; 1199 1200 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1201 isls = 1; 1202 stderrfd = -1; 1203 } else { 1204 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1205 stderrfd = mkstemp(temp); 1206 if (stderrfd != -1) 1207 (void)unlink(temp); 1208 } 1209 dispname = argv[0]; 1210 fin = ftpd_popen(argv, "r", stderrfd); 1211 closefunc = ftpd_pclose; 1212 st.st_size = -1; 1213 st.st_blksize = BUFSIZ; 1214 } 1215 if (fin == NULL) { 1216 if (errno != 0) { 1217 perror_reply(550, dispname); 1218 if (log) 1219 logxfer("get", -1, name, NULL, NULL, 1220 strerror(errno)); 1221 } 1222 goto cleanupretrieve; 1223 } 1224 byte_count = -1; 1225 if (argv == NULL 1226 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1227 reply(550, "%s: not a plain file.", dispname); 1228 goto done; 1229 } 1230 if (restart_point) { 1231 if (type == TYPE_A) { 1232 off_t i; 1233 int c; 1234 1235 for (i = 0; i < restart_point; i++) { 1236 if ((c=getc(fin)) == EOF) { 1237 perror_reply(550, dispname); 1238 goto done; 1239 } 1240 if (c == '\n') 1241 i++; 1242 } 1243 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1244 perror_reply(550, dispname); 1245 goto done; 1246 } 1247 } 1248 dout = dataconn(dispname, st.st_size, "w"); 1249 if (dout == NULL) 1250 goto done; 1251 1252 (void)gettimeofday(&start, NULL); 1253 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1254 (void)gettimeofday(&finish, NULL); 1255 (void) fclose(dout); /* close now to affect timing stats */ 1256 dout = NULL; 1257 timersub(&finish, &start, &td); 1258 tdp = &td; 1259 done: 1260 if (log) 1261 logxfer("get", byte_count, name, NULL, tdp, NULL); 1262 closerv = (*closefunc)(fin); 1263 if (sendrv == 0) { 1264 FILE *err; 1265 struct stat sb; 1266 1267 if (!isls && argv != NULL && closerv != 0) { 1268 reply(-226, 1269 "Command returned an exit status of %d", 1270 closerv); 1271 if (isconversion) 1272 syslog(LOG_WARNING, 1273 "retrieve command: '%s' returned %d", 1274 argv[0], closerv); 1275 } 1276 if (!isls && argv != NULL && stderrfd != -1 && 1277 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1278 ((err = fdopen(stderrfd, "r")) != NULL)) { 1279 char *cp, line[LINE_MAX]; 1280 1281 reply(-226, "Command error messages:"); 1282 rewind(err); 1283 while (fgets(line, sizeof(line), err) != NULL) { 1284 if ((cp = strchr(line, '\n')) != NULL) 1285 *cp = '\0'; 1286 reply(0, " %s", line); 1287 } 1288 (void) fflush(stdout); 1289 (void) fclose(err); 1290 /* a reply(226,) must follow */ 1291 } 1292 reply(226, "Transfer complete."); 1293 } 1294 cleanupretrieve: 1295 closedataconn(dout); 1296 if (stderrfd != -1) 1297 (void)close(stderrfd); 1298 if (isconversion) 1299 free(argv); 1300 } 1301 1302 void 1303 store(const char *name, const char *mode, int unique) 1304 { 1305 FILE *fout, *din; 1306 struct stat st; 1307 int (*closefunc)(FILE *); 1308 struct timeval start, finish, td, *tdp; 1309 char *desc; 1310 1311 din = NULL; 1312 desc = (*mode == 'w') ? "put" : "append"; 1313 if (unique && stat(name, &st) == 0 && 1314 (name = gunique(name)) == NULL) { 1315 logxfer(desc, -1, name, NULL, NULL, 1316 "cannot create unique file"); 1317 goto cleanupstore; 1318 } 1319 1320 if (restart_point) 1321 mode = "r+"; 1322 fout = fopen(name, mode); 1323 closefunc = fclose; 1324 tdp = NULL; 1325 if (fout == NULL) { 1326 perror_reply(553, name); 1327 logxfer(desc, -1, name, NULL, NULL, strerror(errno)); 1328 goto cleanupstore; 1329 } 1330 byte_count = -1; 1331 if (restart_point) { 1332 if (type == TYPE_A) { 1333 off_t i; 1334 int c; 1335 1336 for (i = 0; i < restart_point; i++) { 1337 if ((c=getc(fout)) == EOF) { 1338 perror_reply(550, name); 1339 goto done; 1340 } 1341 if (c == '\n') 1342 i++; 1343 } 1344 /* 1345 * We must do this seek to "current" position 1346 * because we are changing from reading to 1347 * writing. 1348 */ 1349 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1350 perror_reply(550, name); 1351 goto done; 1352 } 1353 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1354 perror_reply(550, name); 1355 goto done; 1356 } 1357 } 1358 din = dataconn(name, (off_t)-1, "r"); 1359 if (din == NULL) 1360 goto done; 1361 (void)gettimeofday(&start, NULL); 1362 if (receive_data(din, fout) == 0) { 1363 if (unique) 1364 reply(226, "Transfer complete (unique file name:%s).", 1365 name); 1366 else 1367 reply(226, "Transfer complete."); 1368 } 1369 (void)gettimeofday(&finish, NULL); 1370 (void) fclose(din); /* close now to affect timing stats */ 1371 din = NULL; 1372 timersub(&finish, &start, &td); 1373 tdp = &td; 1374 done: 1375 logxfer(desc, byte_count, name, NULL, tdp, NULL); 1376 (*closefunc)(fout); 1377 cleanupstore: 1378 closedataconn(din); 1379 } 1380 1381 static FILE * 1382 getdatasock(const char *mode) 1383 { 1384 int on, s, t, tries; 1385 in_port_t port; 1386 1387 on = 1; 1388 if (data >= 0) 1389 return (fdopen(data, mode)); 1390 if (! dropprivs) 1391 (void) seteuid((uid_t)0); 1392 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1393 if (s < 0) 1394 goto bad; 1395 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1396 (char *) &on, sizeof(on)) < 0) 1397 goto bad; 1398 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1399 (char *) &on, sizeof(on)) < 0) 1400 goto bad; 1401 /* anchor socket to avoid multi-homing problems */ 1402 data_source = ctrl_addr; 1403 /* 1404 * By default source port for PORT connctions is 1405 * ctrlport-1 (see RFC959 section 5.2). 1406 * However, if privs have been dropped and that 1407 * would be < IPPORT_RESERVED, use a random port 1408 * instead. 1409 */ 1410 if (dataport) 1411 port = dataport; 1412 else 1413 port = ntohs(ctrl_addr.su_port) - 1; 1414 if (dropprivs && port < IPPORT_RESERVED) 1415 port = 0; /* use random port */ 1416 data_source.su_port = htons(port); 1417 1418 for (tries = 1; ; tries++) { 1419 if (bind(s, (struct sockaddr *)&data_source.si_su, 1420 data_source.su_len) >= 0) 1421 break; 1422 if (errno != EADDRINUSE || tries > 10) 1423 goto bad; 1424 sleep(tries); 1425 } 1426 if (! dropprivs) 1427 (void) seteuid((uid_t)pw->pw_uid); 1428 #ifdef IP_TOS 1429 if (!mapped && ctrl_addr.su_family == AF_INET) { 1430 on = IPTOS_THROUGHPUT; 1431 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1432 sizeof(int)) < 0) 1433 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1434 } 1435 #endif 1436 return (fdopen(s, mode)); 1437 bad: 1438 /* Return the real value of errno (close may change it) */ 1439 t = errno; 1440 if (! dropprivs) 1441 (void) seteuid((uid_t)pw->pw_uid); 1442 (void) close(s); 1443 errno = t; 1444 return (NULL); 1445 } 1446 1447 FILE * 1448 dataconn(const char *name, off_t size, const char *mode) 1449 { 1450 char sizebuf[32]; 1451 FILE *file; 1452 int retry = 0, tos, keepalive; 1453 1454 file_size = size; 1455 byte_count = 0; 1456 if (size != (off_t) -1) 1457 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1458 (LLT)size, PLURAL(size)); 1459 else 1460 sizebuf[0] = '\0'; 1461 if (pdata >= 0) { 1462 struct sockinet from; 1463 int s, fromlen = sizeof(from.su_len); 1464 1465 (void) alarm(curclass.timeout); 1466 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 1467 (void) alarm(0); 1468 if (s < 0) { 1469 reply(425, "Can't open data connection."); 1470 (void) close(pdata); 1471 pdata = -1; 1472 return (NULL); 1473 } 1474 (void) close(pdata); 1475 pdata = s; 1476 switch (from.su_family) { 1477 case AF_INET: 1478 #ifdef IP_TOS 1479 if (!mapped) { 1480 tos = IPTOS_THROUGHPUT; 1481 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1482 (char *)&tos, sizeof(int)); 1483 } 1484 break; 1485 #endif 1486 } 1487 /* Set keepalives on the socket to detect dropped conns. */ 1488 #ifdef SO_KEEPALIVE 1489 keepalive = 1; 1490 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1491 (char *)&keepalive, sizeof(int)); 1492 #endif 1493 reply(150, "Opening %s mode data connection for '%s'%s.", 1494 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1495 return (fdopen(pdata, mode)); 1496 } 1497 if (data >= 0) { 1498 reply(125, "Using existing data connection for '%s'%s.", 1499 name, sizebuf); 1500 usedefault = 1; 1501 return (fdopen(data, mode)); 1502 } 1503 if (usedefault) 1504 data_dest = his_addr; 1505 usedefault = 1; 1506 file = getdatasock(mode); 1507 if (file == NULL) { 1508 char hbuf[NI_MAXHOST]; 1509 char pbuf[NI_MAXSERV]; 1510 1511 if (getnameinfo((struct sockaddr *)&data_source.si_su, 1512 data_source.su_len, hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1513 NI_NUMERICHOST | NI_NUMERICSERV)) 1514 strlcpy(hbuf, "?", sizeof(hbuf)); 1515 reply(425, "Can't create data socket (%s,%s): %s.", 1516 hbuf, pbuf, strerror(errno)); 1517 return (NULL); 1518 } 1519 data = fileno(file); 1520 while (connect(data, (struct sockaddr *)&data_dest.si_su, 1521 data_dest.su_len) < 0) { 1522 if (errno == EADDRINUSE && retry < swaitmax) { 1523 sleep((unsigned) swaitint); 1524 retry += swaitint; 1525 continue; 1526 } 1527 perror_reply(425, "Can't build data connection"); 1528 (void) fclose(file); 1529 data = -1; 1530 return (NULL); 1531 } 1532 reply(150, "Opening %s mode data connection for '%s'%s.", 1533 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1534 return (file); 1535 } 1536 1537 void 1538 closedataconn(FILE *fd) 1539 { 1540 1541 if (fd != NULL) 1542 (void)fclose(fd); 1543 data = -1; 1544 if (pdata >= 0) 1545 (void)close(pdata); 1546 pdata = -1; 1547 } 1548 1549 /* 1550 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1551 * encapsulation of the data subject * to Mode, Structure, and Type. 1552 * 1553 * NB: Form isn't handled. 1554 */ 1555 static int 1556 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1557 { 1558 int c, filefd, netfd, rval; 1559 char *buf; 1560 1561 transflag = 1; 1562 rval = -1; 1563 buf = NULL; 1564 if (setjmp(urgcatch)) 1565 goto cleanup_send_data; 1566 1567 switch (type) { 1568 1569 case TYPE_A: 1570 /* XXXLUKEM: rate limit ascii send (get) */ 1571 (void) alarm(curclass.timeout); 1572 while ((c = getc(instr)) != EOF) { 1573 byte_count++; 1574 if (c == '\n') { 1575 if (ferror(outstr)) 1576 goto data_err; 1577 (void) putc('\r', outstr); 1578 if (isdata) { 1579 total_data_out++; 1580 total_data++; 1581 } 1582 total_bytes_out++; 1583 total_bytes++; 1584 } 1585 (void) putc(c, outstr); 1586 if (isdata) { 1587 total_data_out++; 1588 total_data++; 1589 } 1590 total_bytes_out++; 1591 total_bytes++; 1592 if ((byte_count % 4096) == 0) 1593 (void) alarm(curclass.timeout); 1594 } 1595 (void) alarm(0); 1596 fflush(outstr); 1597 if (ferror(instr)) 1598 goto file_err; 1599 if (ferror(outstr)) 1600 goto data_err; 1601 rval = 0; 1602 goto cleanup_send_data; 1603 1604 case TYPE_I: 1605 case TYPE_L: 1606 if ((buf = malloc((size_t)blksize)) == NULL) { 1607 perror_reply(451, "Local resource failure: malloc"); 1608 goto cleanup_send_data; 1609 } 1610 filefd = fileno(instr); 1611 netfd = fileno(outstr); 1612 (void) alarm(curclass.timeout); 1613 if (curclass.rateget) { 1614 while (1) { 1615 int d; 1616 struct timeval then, now, td; 1617 off_t bufrem; 1618 char *bufp; 1619 1620 (void)gettimeofday(&then, NULL); 1621 errno = c = d = 0; 1622 bufrem = curclass.rateget; 1623 while (bufrem > 0) { 1624 if ((c = read(filefd, buf, 1625 MIN(blksize, bufrem))) <= 0) 1626 goto senddone; 1627 (void) alarm(curclass.timeout); 1628 bufrem -= c; 1629 byte_count += c; 1630 if (isdata) { 1631 total_data_out += c; 1632 total_data += c; 1633 } 1634 total_bytes_out += c; 1635 total_bytes += c; 1636 for (bufp = buf; c > 0; 1637 c -= d, bufp += d) 1638 if ((d = 1639 write(netfd, bufp, c)) <= 0) 1640 break; 1641 if (d < 0) 1642 goto data_err; 1643 } 1644 (void)gettimeofday(&now, NULL); 1645 timersub(&now, &then, &td); 1646 if (td.tv_sec == 0) 1647 usleep(1000000 - td.tv_usec); 1648 } 1649 } else { 1650 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1651 if (write(netfd, buf, c) != c) 1652 goto data_err; 1653 (void) alarm(curclass.timeout); 1654 byte_count += c; 1655 if (isdata) { 1656 total_data_out += c; 1657 total_data += c; 1658 } 1659 total_bytes_out += c; 1660 total_bytes += c; 1661 } 1662 } 1663 senddone: 1664 if (c < 0) 1665 goto file_err; 1666 rval = 0; 1667 goto cleanup_send_data; 1668 1669 default: 1670 reply(550, "Unimplemented TYPE %d in send_data", type); 1671 goto cleanup_send_data; 1672 } 1673 1674 data_err: 1675 (void) alarm(0); 1676 perror_reply(426, "Data connection"); 1677 goto cleanup_send_data; 1678 1679 file_err: 1680 (void) alarm(0); 1681 perror_reply(551, "Error on input file"); 1682 /* FALLTHROUGH */ 1683 1684 cleanup_send_data: 1685 (void) alarm(0); 1686 transflag = 0; 1687 if (buf) 1688 free(buf); 1689 if (isdata) { 1690 total_files_out++; 1691 total_files++; 1692 } 1693 total_xfers_out++; 1694 total_xfers++; 1695 return (rval); 1696 } 1697 1698 /* 1699 * Transfer data from peer to "outstr" using the appropriate encapulation of 1700 * the data subject to Mode, Structure, and Type. 1701 * 1702 * N.B.: Form isn't handled. 1703 */ 1704 static int 1705 receive_data(FILE *instr, FILE *outstr) 1706 { 1707 int c, bare_lfs, netfd, filefd, rval; 1708 off_t byteswritten; 1709 char buf[BUFSIZ]; 1710 #ifdef __GNUC__ 1711 (void) &bare_lfs; 1712 #endif 1713 1714 bare_lfs = 0; 1715 transflag = 1; 1716 rval = -1; 1717 byteswritten = 0; 1718 if (setjmp(urgcatch)) 1719 goto cleanup_recv_data; 1720 1721 #define FILESIZECHECK(x) \ 1722 do { \ 1723 if (curclass.maxfilesize != -1 && \ 1724 (x) > curclass.maxfilesize) { \ 1725 errno = EFBIG; \ 1726 goto file_err; \ 1727 } \ 1728 } while (0) 1729 1730 switch (type) { 1731 1732 case TYPE_I: 1733 case TYPE_L: 1734 netfd = fileno(instr); 1735 filefd = fileno(outstr); 1736 (void) alarm(curclass.timeout); 1737 if (curclass.rateput) { 1738 while (1) { 1739 int d; 1740 struct timeval then, now, td; 1741 off_t bufrem; 1742 1743 (void)gettimeofday(&then, NULL); 1744 errno = c = d = 0; 1745 for (bufrem = curclass.rateput; bufrem > 0; ) { 1746 if ((c = read(netfd, buf, 1747 MIN(sizeof(buf), bufrem))) <= 0) 1748 goto recvdone; 1749 FILESIZECHECK(byte_count + c); 1750 if ((d = write(filefd, buf, c)) != c) 1751 goto file_err; 1752 (void) alarm(curclass.timeout); 1753 bufrem -= c; 1754 byte_count += c; 1755 total_data_in += c; 1756 total_data += c; 1757 total_bytes_in += c; 1758 total_bytes += c; 1759 } 1760 (void)gettimeofday(&now, NULL); 1761 timersub(&now, &then, &td); 1762 if (td.tv_sec == 0) 1763 usleep(1000000 - td.tv_usec); 1764 } 1765 } else { 1766 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1767 FILESIZECHECK(byte_count + c); 1768 if (write(filefd, buf, c) != c) 1769 goto file_err; 1770 (void) alarm(curclass.timeout); 1771 byte_count += c; 1772 total_data_in += c; 1773 total_data += c; 1774 total_bytes_in += c; 1775 total_bytes += c; 1776 } 1777 } 1778 recvdone: 1779 if (c < 0) 1780 goto data_err; 1781 rval = 0; 1782 goto cleanup_recv_data; 1783 1784 case TYPE_E: 1785 reply(553, "TYPE E not implemented."); 1786 goto cleanup_recv_data; 1787 1788 case TYPE_A: 1789 (void) alarm(curclass.timeout); 1790 /* XXXLUKEM: rate limit ascii receive (put) */ 1791 while ((c = getc(instr)) != EOF) { 1792 byte_count++; 1793 total_data_in++; 1794 total_data++; 1795 total_bytes_in++; 1796 total_bytes++; 1797 if ((byte_count % 4096) == 0) 1798 (void) alarm(curclass.timeout); 1799 if (c == '\n') 1800 bare_lfs++; 1801 while (c == '\r') { 1802 if (ferror(outstr)) 1803 goto data_err; 1804 if ((c = getc(instr)) != '\n') { 1805 byte_count++; 1806 total_data_in++; 1807 total_data++; 1808 total_bytes_in++; 1809 total_bytes++; 1810 if ((byte_count % 4096) == 0) 1811 (void) alarm(curclass.timeout); 1812 byteswritten++; 1813 FILESIZECHECK(byteswritten); 1814 (void) putc ('\r', outstr); 1815 if (c == '\0' || c == EOF) 1816 goto contin2; 1817 } 1818 } 1819 byteswritten++; 1820 FILESIZECHECK(byteswritten); 1821 (void) putc(c, outstr); 1822 contin2: ; 1823 } 1824 (void) alarm(0); 1825 fflush(outstr); 1826 if (ferror(instr)) 1827 goto data_err; 1828 if (ferror(outstr)) 1829 goto file_err; 1830 if (bare_lfs) { 1831 reply(-226, 1832 "WARNING! %d bare linefeeds received in ASCII mode", 1833 bare_lfs); 1834 reply(0, "File may not have transferred correctly."); 1835 } 1836 rval = 0; 1837 goto cleanup_recv_data; 1838 1839 default: 1840 reply(550, "Unimplemented TYPE %d in receive_data", type); 1841 goto cleanup_recv_data; 1842 } 1843 #undef FILESIZECHECK 1844 1845 data_err: 1846 (void) alarm(0); 1847 perror_reply(426, "Data Connection"); 1848 goto cleanup_recv_data; 1849 1850 file_err: 1851 (void) alarm(0); 1852 perror_reply(452, "Error writing file"); 1853 goto cleanup_recv_data; 1854 1855 cleanup_recv_data: 1856 (void) alarm(0); 1857 transflag = 0; 1858 total_files_in++; 1859 total_files++; 1860 total_xfers_in++; 1861 total_xfers++; 1862 return (rval); 1863 } 1864 1865 void 1866 statcmd(void) 1867 { 1868 struct sockinet *su = NULL; 1869 static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 1870 u_char *a, *p; 1871 int ispassive, af; 1872 off_t otbi, otbo, otb; 1873 1874 a = p = (u_char *)NULL; 1875 1876 reply(-211, "%s FTP server status:", hostname); 1877 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 1878 hbuf[0] = '\0'; 1879 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 1880 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) 1881 && strcmp(remotehost, hbuf) != 0) 1882 reply(0, "Connected to %s (%s)", remotehost, hbuf); 1883 else 1884 reply(0, "Connected to %s", remotehost); 1885 1886 if (logged_in) { 1887 if (curclass.type == CLASS_GUEST) 1888 reply(0, "Logged in anonymously"); 1889 else 1890 reply(0, "Logged in as %s%s", pw->pw_name, 1891 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1892 } else if (askpasswd) 1893 reply(0, "Waiting for password"); 1894 else 1895 reply(0, "Waiting for user name"); 1896 cprintf(stdout, " TYPE: %s", typenames[type]); 1897 if (type == TYPE_A || type == TYPE_E) 1898 cprintf(stdout, ", FORM: %s", formnames[form]); 1899 if (type == TYPE_L) { 1900 #if NBBY == 8 1901 cprintf(stdout, " %d", NBBY); 1902 #else 1903 /* XXX: `bytesize' needs to be defined in this case */ 1904 cprintf(stdout, " %d", bytesize); 1905 #endif 1906 } 1907 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 1908 strunames[stru], modenames[mode]); 1909 ispassive = 0; 1910 if (data != -1) { 1911 reply(0, "Data connection open"); 1912 su = NULL; 1913 } else if (pdata != -1) { 1914 reply(0, "in Passive mode"); 1915 if (curclass.advertise.su_len != 0) 1916 su = &curclass.advertise; 1917 else 1918 su = &pasv_addr; 1919 ispassive = 1; 1920 goto printaddr; 1921 } else if (usedefault == 0) { 1922 if (epsvall) { 1923 reply(0, "EPSV only mode (EPSV ALL)"); 1924 goto epsvonly; 1925 } 1926 su = (struct sockinet *)&data_dest; 1927 printaddr: 1928 /* PASV/PORT */ 1929 if (su->su_family == AF_INET) { 1930 a = (u_char *) &su->su_addr; 1931 p = (u_char *) &su->su_port; 1932 #define UC(b) (((int) b) & 0xff) 1933 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 1934 ispassive ? "PASV" : "PORT" , 1935 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1936 UC(p[0]), UC(p[1])); 1937 } 1938 1939 /* LPSV/LPRT */ 1940 { 1941 int alen, af, i; 1942 1943 alen = 0; 1944 switch (su->su_family) { 1945 case AF_INET: 1946 a = (u_char *) &su->su_addr; 1947 p = (u_char *) &su->su_port; 1948 alen = sizeof(su->su_addr); 1949 af = 4; 1950 break; 1951 #ifdef INET6 1952 case AF_INET6: 1953 a = (u_char *) &su->su_6addr; 1954 p = (u_char *) &su->su_port; 1955 alen = sizeof(su->su_6addr); 1956 af = 6; 1957 break; 1958 #endif 1959 default: 1960 af = 0; 1961 break; 1962 } 1963 if (af) { 1964 cprintf(stdout, " %s (%d,%d", 1965 ispassive ? "LPSV" : "LPRT", af, alen); 1966 for (i = 0; i < alen; i++) 1967 cprintf(stdout, ",%d", UC(a[i])); 1968 cprintf(stdout, ",%d,%d,%d)\r\n", 1969 2, UC(p[0]), UC(p[1])); 1970 #undef UC 1971 } 1972 } 1973 1974 /* EPRT/EPSV */ 1975 epsvonly: 1976 af = af2epsvproto(su->su_family); 1977 hbuf[0] = '\0'; 1978 if (af > 0) { 1979 struct sockinet tmp; 1980 1981 tmp = *su; 1982 #ifdef INET6 1983 if (tmp.su_family == AF_INET6) 1984 tmp.su_scope_id = 0; 1985 #endif 1986 if (getnameinfo((struct sockaddr *)&tmp.si_su, 1987 tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 1988 NI_NUMERICHOST | NI_NUMERICSERV) == 0) 1989 reply(0, "%s (|%d|%s|%s|)", 1990 ispassive ? "EPSV" : "EPRT", 1991 af, hbuf, sbuf); 1992 } 1993 } else 1994 reply(0, "No data connection"); 1995 1996 if (logged_in) { 1997 reply(0, 1998 "Data sent: " LLF " byte%s in " LLF " file%s", 1999 (LLT)total_data_out, PLURAL(total_data_out), 2000 (LLT)total_files_out, PLURAL(total_files_out)); 2001 reply(0, 2002 "Data received: " LLF " byte%s in " LLF " file%s", 2003 (LLT)total_data_in, PLURAL(total_data_in), 2004 (LLT)total_files_in, PLURAL(total_files_in)); 2005 reply(0, 2006 "Total data: " LLF " byte%s in " LLF " file%s", 2007 (LLT)total_data, PLURAL(total_data), 2008 (LLT)total_files, PLURAL(total_files)); 2009 } 2010 otbi = total_bytes_in; 2011 otbo = total_bytes_out; 2012 otb = total_bytes; 2013 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 2014 (LLT)otbo, PLURAL(otbo), 2015 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 2016 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 2017 (LLT)otbi, PLURAL(otbi), 2018 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 2019 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 2020 (LLT)otb, PLURAL(otb), 2021 (LLT)total_xfers, PLURAL(total_xfers)); 2022 2023 if (logged_in) { 2024 struct ftpconv *cp; 2025 2026 reply(0, "%s", ""); 2027 reply(0, "Class: %s, type: %s", 2028 curclass.classname, CURCLASSTYPE); 2029 reply(0, "Check PORT/LPRT commands: %sabled", 2030 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 2031 if (! EMPTYSTR(curclass.display)) 2032 reply(0, "Display file: %s", curclass.display); 2033 if (! EMPTYSTR(curclass.notify)) 2034 reply(0, "Notify fileglob: %s", curclass.notify); 2035 reply(0, "Idle timeout: %d, maximum timeout: %d", 2036 curclass.timeout, curclass.maxtimeout); 2037 reply(0, "Current connections: %d", connections); 2038 if (curclass.limit == -1) 2039 reply(0, "Maximum connections: unlimited"); 2040 else 2041 reply(0, "Maximum connections: %d", curclass.limit); 2042 if (curclass.limitfile) 2043 reply(0, "Connection limit exceeded message file: %s", 2044 curclass.limitfile); 2045 if (! EMPTYSTR(curclass.chroot)) 2046 reply(0, "Chroot format: %s", curclass.chroot); 2047 if (! EMPTYSTR(curclass.homedir)) 2048 reply(0, "Homedir format: %s", curclass.homedir); 2049 if (curclass.maxfilesize == -1) 2050 reply(0, "Maximum file size: unlimited"); 2051 else 2052 reply(0, "Maximum file size: " LLF, 2053 (LLT)curclass.maxfilesize); 2054 if (! EMPTYSTR(curclass.motd)) 2055 reply(0, "MotD file: %s", curclass.motd); 2056 reply(0, 2057 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2058 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2059 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2060 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2061 reply(0, "Sanitize file names: %sabled", 2062 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2063 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2064 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2065 if (curclass.advertise.su_len != 0) { 2066 char buf[50]; /* big enough for IPv6 address */ 2067 const char *bp; 2068 2069 bp = inet_ntop(curclass.advertise.su_family, 2070 (void *)&curclass.advertise.su_addr, 2071 buf, sizeof(buf)); 2072 if (bp != NULL) 2073 reply(0, "PASV advertise address: %s", bp); 2074 } 2075 if (curclass.portmin && curclass.portmax) 2076 reply(0, "PASV port range: %d - %d", 2077 curclass.portmin, curclass.portmax); 2078 if (curclass.rateget) 2079 reply(0, "Rate get limit: " LLF " bytes/sec", 2080 (LLT)curclass.rateget); 2081 else 2082 reply(0, "Rate get limit: disabled"); 2083 if (curclass.rateput) 2084 reply(0, "Rate put limit: " LLF " bytes/sec", 2085 (LLT)curclass.rateput); 2086 else 2087 reply(0, "Rate put limit: disabled"); 2088 reply(0, "Umask: %.04o", curclass.umask); 2089 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2090 if (cp->suffix == NULL || cp->types == NULL || 2091 cp->command == NULL) 2092 continue; 2093 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2094 cp->suffix, cp->types, cp->disable, cp->command); 2095 } 2096 } 2097 2098 reply(211, "End of status"); 2099 } 2100 2101 void 2102 fatal(const char *s) 2103 { 2104 2105 reply(451, "Error in server: %s\n", s); 2106 reply(221, "Closing connection due to server error."); 2107 dologout(0); 2108 /* NOTREACHED */ 2109 } 2110 2111 /* 2112 * reply() -- 2113 * depending on the value of n, display fmt with a trailing CRLF and 2114 * prefix of: 2115 * n < -1 prefix the message with abs(n) + "-" (initial line) 2116 * n == 0 prefix the message with 4 spaces (middle lines) 2117 * n > 0 prefix the message with n + " " (final line) 2118 */ 2119 void 2120 reply(int n, const char *fmt, ...) 2121 { 2122 off_t b; 2123 va_list ap; 2124 2125 va_start(ap, fmt); 2126 b = 0; 2127 if (n == 0) 2128 cprintf(stdout, " "); 2129 else if (n < 0) 2130 cprintf(stdout, "%d-", -n); 2131 else 2132 cprintf(stdout, "%d ", n); 2133 b = vprintf(fmt, ap); 2134 total_bytes += b; 2135 total_bytes_out += b; 2136 cprintf(stdout, "\r\n"); 2137 (void)fflush(stdout); 2138 if (debug) { 2139 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 2140 vsyslog(LOG_DEBUG, fmt, ap); 2141 } 2142 } 2143 2144 static void 2145 logremotehost(struct sockinet *who) 2146 { 2147 2148 if (getnameinfo((struct sockaddr *)&who->si_su, 2149 who->su_len, remotehost, sizeof(remotehost), NULL, 0, 0)) 2150 strlcpy(remotehost, "?", sizeof(remotehost)); 2151 2152 #if HAVE_SETPROCTITLE 2153 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2154 setproctitle("%s", proctitle); 2155 #endif /* HAVE_SETPROCTITLE */ 2156 if (logging) 2157 syslog(LOG_INFO, "connection from %s to %s", 2158 remotehost, hostname); 2159 } 2160 2161 /* 2162 * Record logout in wtmp file and exit with supplied status. 2163 */ 2164 void 2165 dologout(int status) 2166 { 2167 /* 2168 * Prevent reception of SIGURG from resulting in a resumption 2169 * back to the main program loop. 2170 */ 2171 transflag = 0; 2172 2173 if (logged_in) { 2174 if (dowtmp) 2175 logwtmp(ttyline, "", ""); 2176 if (doutmp) 2177 logout(utmp.ut_line); 2178 #ifdef KERBEROS 2179 if (!notickets && krbtkfile_env) 2180 unlink(krbtkfile_env); 2181 #endif 2182 } 2183 /* beware of flushing buffers after a SIGPIPE */ 2184 _exit(status); 2185 } 2186 2187 static void 2188 myoob(int signo) 2189 { 2190 char *cp; 2191 2192 /* only process if transfer occurring */ 2193 if (!transflag) 2194 return; 2195 cp = tmpline; 2196 if (getline(cp, 7, stdin) == NULL) { 2197 reply(221, "You could at least say goodbye."); 2198 dologout(0); 2199 } 2200 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2201 tmpline[0] = '\0'; 2202 reply(426, "Transfer aborted. Data connection closed."); 2203 reply(226, "Abort successful"); 2204 longjmp(urgcatch, 1); 2205 } 2206 if (strcasecmp(cp, "STAT\r\n") == 0) { 2207 tmpline[0] = '\0'; 2208 if (file_size != (off_t) -1) 2209 reply(213, 2210 "Status: " LLF " of " LLF " byte%s transferred", 2211 (LLT)byte_count, (LLT)file_size, 2212 PLURAL(byte_count)); 2213 else 2214 reply(213, "Status: " LLF " byte%s transferred", 2215 (LLT)byte_count, PLURAL(byte_count)); 2216 } 2217 } 2218 2219 static int 2220 bind_pasv_addr(void) 2221 { 2222 static int passiveport; 2223 int port, len; 2224 2225 len = pasv_addr.su_len; 2226 if (curclass.portmin == 0 && curclass.portmax == 0) { 2227 pasv_addr.su_port = 0; 2228 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2229 } 2230 2231 if (passiveport == 0) { 2232 srand(getpid()); 2233 passiveport = rand() % (curclass.portmax - curclass.portmin) 2234 + curclass.portmin; 2235 } 2236 2237 port = passiveport; 2238 while (1) { 2239 port++; 2240 if (port > curclass.portmax) 2241 port = curclass.portmin; 2242 else if (port == passiveport) { 2243 errno = EAGAIN; 2244 return (-1); 2245 } 2246 pasv_addr.su_port = htons(port); 2247 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 2248 break; 2249 if (errno != EADDRINUSE) 2250 return (-1); 2251 } 2252 passiveport = port; 2253 return (0); 2254 } 2255 2256 /* 2257 * Note: a response of 425 is not mentioned as a possible response to 2258 * the PASV command in RFC959. However, it has been blessed as 2259 * a legitimate response by Jon Postel in a telephone conversation 2260 * with Rick Adams on 25 Jan 89. 2261 */ 2262 void 2263 passive(void) 2264 { 2265 int len; 2266 char *p, *a; 2267 2268 if (pdata >= 0) 2269 close(pdata); 2270 pdata = socket(AF_INET, SOCK_STREAM, 0); 2271 if (pdata < 0 || !logged_in) { 2272 perror_reply(425, "Can't open passive connection"); 2273 return; 2274 } 2275 pasv_addr = ctrl_addr; 2276 2277 if (bind_pasv_addr() < 0) 2278 goto pasv_error; 2279 len = pasv_addr.su_len; 2280 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2281 goto pasv_error; 2282 pasv_addr.su_len = len; 2283 if (listen(pdata, 1) < 0) 2284 goto pasv_error; 2285 if (curclass.advertise.su_len != 0) 2286 a = (char *) &curclass.advertise.su_addr; 2287 else 2288 a = (char *) &pasv_addr.su_addr; 2289 p = (char *) &pasv_addr.su_port; 2290 2291 #define UC(b) (((int) b) & 0xff) 2292 2293 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2294 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2295 return; 2296 2297 pasv_error: 2298 (void) close(pdata); 2299 pdata = -1; 2300 perror_reply(425, "Can't open passive connection"); 2301 return; 2302 } 2303 2304 /* 2305 * convert protocol identifier to/from AF 2306 */ 2307 int 2308 lpsvproto2af(int proto) 2309 { 2310 2311 switch (proto) { 2312 case 4: 2313 return AF_INET; 2314 #ifdef INET6 2315 case 6: 2316 return AF_INET6; 2317 #endif 2318 default: 2319 return -1; 2320 } 2321 } 2322 2323 int 2324 af2lpsvproto(int af) 2325 { 2326 2327 switch (af) { 2328 case AF_INET: 2329 return 4; 2330 #ifdef INET6 2331 case AF_INET6: 2332 return 6; 2333 #endif 2334 default: 2335 return -1; 2336 } 2337 } 2338 2339 int 2340 epsvproto2af(int proto) 2341 { 2342 2343 switch (proto) { 2344 case 1: 2345 return AF_INET; 2346 #ifdef INET6 2347 case 2: 2348 return AF_INET6; 2349 #endif 2350 default: 2351 return -1; 2352 } 2353 } 2354 2355 int 2356 af2epsvproto(int af) 2357 { 2358 2359 switch (af) { 2360 case AF_INET: 2361 return 1; 2362 #ifdef INET6 2363 case AF_INET6: 2364 return 2; 2365 #endif 2366 default: 2367 return -1; 2368 } 2369 } 2370 2371 /* 2372 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2373 * 229 Entering Extended Passive Mode (|||port|) 2374 */ 2375 void 2376 long_passive(char *cmd, int pf) 2377 { 2378 int len; 2379 char *p, *a; 2380 2381 if (!logged_in) { 2382 syslog(LOG_NOTICE, "long passive but not logged in"); 2383 reply(503, "Login with USER first."); 2384 return; 2385 } 2386 2387 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2388 /* 2389 * XXX: only EPRT/EPSV ready clients will understand this 2390 */ 2391 if (strcmp(cmd, "EPSV") != 0) 2392 reply(501, "Network protocol mismatch"); /*XXX*/ 2393 else 2394 epsv_protounsupp("Network protocol mismatch"); 2395 2396 return; 2397 } 2398 2399 if (pdata >= 0) 2400 close(pdata); 2401 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2402 if (pdata < 0) { 2403 perror_reply(425, "Can't open passive connection"); 2404 return; 2405 } 2406 pasv_addr = ctrl_addr; 2407 if (bind_pasv_addr() < 0) 2408 goto pasv_error; 2409 len = pasv_addr.su_len; 2410 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2411 goto pasv_error; 2412 pasv_addr.su_len = len; 2413 if (listen(pdata, 1) < 0) 2414 goto pasv_error; 2415 p = (char *) &pasv_addr.su_port; 2416 2417 #define UC(b) (((int) b) & 0xff) 2418 2419 if (strcmp(cmd, "LPSV") == 0) { 2420 struct sockinet *advert; 2421 2422 if (curclass.advertise.su_len != 0) 2423 advert = &curclass.advertise; 2424 else 2425 advert = &pasv_addr; 2426 switch (advert->su_family) { 2427 case AF_INET: 2428 a = (char *) &advert->su_addr; 2429 reply(228, 2430 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2431 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2432 2, UC(p[0]), UC(p[1])); 2433 return; 2434 #ifdef INET6 2435 case AF_INET6: 2436 a = (char *) &advert->su_6addr; 2437 reply(228, 2438 "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)", 2439 6, 16, 2440 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2441 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2442 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2443 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2444 2, UC(p[0]), UC(p[1])); 2445 return; 2446 #endif 2447 } 2448 #undef UC 2449 } else if (strcmp(cmd, "EPSV") == 0) { 2450 switch (pasv_addr.su_family) { 2451 case AF_INET: 2452 #ifdef INET6 2453 case AF_INET6: 2454 #endif 2455 reply(229, "Entering Extended Passive Mode (|||%d|)", 2456 ntohs(pasv_addr.su_port)); 2457 return; 2458 } 2459 } else { 2460 /* more proper error code? */ 2461 } 2462 2463 pasv_error: 2464 (void) close(pdata); 2465 pdata = -1; 2466 perror_reply(425, "Can't open passive connection"); 2467 return; 2468 } 2469 2470 int 2471 extended_port(const char *arg) 2472 { 2473 char *tmp = NULL; 2474 char *result[3]; 2475 char *p, *q; 2476 char delim; 2477 struct addrinfo hints; 2478 struct addrinfo *res = NULL; 2479 int i; 2480 unsigned long proto; 2481 2482 tmp = xstrdup(arg); 2483 p = tmp; 2484 delim = p[0]; 2485 p++; 2486 memset(result, 0, sizeof(result)); 2487 for (i = 0; i < 3; i++) { 2488 q = strchr(p, delim); 2489 if (!q || *q != delim) 2490 goto parsefail; 2491 *q++ = '\0'; 2492 result[i] = p; 2493 p = q; 2494 } 2495 2496 /* some more sanity checks */ 2497 p = NULL; 2498 (void)strtoul(result[2], &p, 10); 2499 if (!*result[2] || *p) 2500 goto parsefail; 2501 p = NULL; 2502 proto = strtoul(result[0], &p, 10); 2503 if (!*result[0] || *p) 2504 goto protounsupp; 2505 2506 memset(&hints, 0, sizeof(hints)); 2507 hints.ai_family = epsvproto2af((int)proto); 2508 if (hints.ai_family < 0) 2509 goto protounsupp; 2510 hints.ai_socktype = SOCK_STREAM; 2511 hints.ai_flags = AI_NUMERICHOST; 2512 if (getaddrinfo(result[1], result[2], &hints, &res)) 2513 goto parsefail; 2514 if (res->ai_next) 2515 goto parsefail; 2516 if (sizeof(data_dest) < res->ai_addrlen) 2517 goto parsefail; 2518 memcpy(&data_dest.si_su, res->ai_addr, res->ai_addrlen); 2519 data_dest.su_len = res->ai_addrlen; 2520 #ifdef INET6 2521 if (his_addr.su_family == AF_INET6 && 2522 data_dest.su_family == AF_INET6) { 2523 /* XXX: more sanity checks! */ 2524 data_dest.su_scope_id = his_addr.su_scope_id; 2525 } 2526 #endif 2527 2528 if (tmp != NULL) 2529 free(tmp); 2530 if (res) 2531 freeaddrinfo(res); 2532 return 0; 2533 2534 parsefail: 2535 reply(500, "Invalid argument, rejected."); 2536 usedefault = 1; 2537 if (tmp != NULL) 2538 free(tmp); 2539 if (res) 2540 freeaddrinfo(res); 2541 return -1; 2542 2543 protounsupp: 2544 epsv_protounsupp("Protocol not supported"); 2545 usedefault = 1; 2546 if (tmp != NULL) 2547 free(tmp); 2548 if (res) 2549 freeaddrinfo(res); 2550 return -1; 2551 } 2552 2553 /* 2554 * 522 Protocol not supported (proto,...) 2555 * as we assume address family for control and data connections are the same, 2556 * we do not return the list of address families we support - instead, we 2557 * return the address family of the control connection. 2558 */ 2559 void 2560 epsv_protounsupp(const char *message) 2561 { 2562 int proto; 2563 2564 proto = af2epsvproto(ctrl_addr.su_family); 2565 if (proto < 0) 2566 reply(501, "%s", message); /* XXX */ 2567 else 2568 reply(522, "%s, use (%d)", message, proto); 2569 } 2570 2571 /* 2572 * Generate unique name for file with basename "local". 2573 * The file named "local" is already known to exist. 2574 * Generates failure reply on error. 2575 * 2576 * XXX: this function should under go changes similar to 2577 * the mktemp(3)/mkstemp(3) changes. 2578 */ 2579 static char * 2580 gunique(const char *local) 2581 { 2582 static char new[MAXPATHLEN]; 2583 struct stat st; 2584 char *cp; 2585 int count; 2586 2587 cp = strrchr(local, '/'); 2588 if (cp) 2589 *cp = '\0'; 2590 if (stat(cp ? local : ".", &st) < 0) { 2591 perror_reply(553, cp ? local : "."); 2592 return (NULL); 2593 } 2594 if (cp) 2595 *cp = '/'; 2596 for (count = 1; count < 100; count++) { 2597 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2598 if (stat(new, &st) < 0) 2599 return (new); 2600 } 2601 reply(452, "Unique file name cannot be created."); 2602 return (NULL); 2603 } 2604 2605 /* 2606 * Format and send reply containing system error number. 2607 */ 2608 void 2609 perror_reply(int code, const char *string) 2610 { 2611 int save_errno; 2612 2613 save_errno = errno; 2614 reply(code, "%s: %s.", string, strerror(errno)); 2615 errno = save_errno; 2616 } 2617 2618 static char *onefile[] = { 2619 "", 2620 0 2621 }; 2622 2623 void 2624 send_file_list(const char *whichf) 2625 { 2626 struct stat st; 2627 DIR *dirp = NULL; 2628 struct dirent *dir; 2629 FILE *dout = NULL; 2630 char **dirlist, *dirname, *p; 2631 int simple = 0; 2632 int freeglob = 0; 2633 glob_t gl; 2634 2635 #ifdef __GNUC__ 2636 (void) &dout; 2637 (void) &dirlist; 2638 (void) &simple; 2639 (void) &freeglob; 2640 #endif 2641 2642 p = NULL; 2643 if (strpbrk(whichf, "~{[*?") != NULL) { 2644 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2645 2646 memset(&gl, 0, sizeof(gl)); 2647 freeglob = 1; 2648 if (glob(whichf, flags, 0, &gl)) { 2649 reply(550, "not found"); 2650 goto out; 2651 } else if (gl.gl_pathc == 0) { 2652 errno = ENOENT; 2653 perror_reply(550, whichf); 2654 goto out; 2655 } 2656 dirlist = gl.gl_pathv; 2657 } else { 2658 p = xstrdup(whichf); 2659 onefile[0] = p; 2660 dirlist = onefile; 2661 simple = 1; 2662 } 2663 /* XXX: } for vi sm */ 2664 2665 if (setjmp(urgcatch)) { 2666 transflag = 0; 2667 goto out; 2668 } 2669 while ((dirname = *dirlist++) != NULL) { 2670 int trailingslash = 0; 2671 2672 if (stat(dirname, &st) < 0) { 2673 /* 2674 * If user typed "ls -l", etc, and the client 2675 * used NLST, do what the user meant. 2676 */ 2677 /* XXX: nuke this support? */ 2678 if (dirname[0] == '-' && *dirlist == NULL && 2679 transflag == 0) { 2680 char *argv[] = { INTERNAL_LS, "", NULL }; 2681 2682 argv[1] = dirname; 2683 retrieve(argv, dirname); 2684 goto out; 2685 } 2686 perror_reply(550, whichf); 2687 goto cleanup_send_file_list; 2688 } 2689 2690 if (S_ISREG(st.st_mode)) { 2691 /* 2692 * XXXRFC: 2693 * should we follow RFC959 and not work 2694 * for non directories? 2695 */ 2696 if (dout == NULL) { 2697 dout = dataconn("file list", (off_t)-1, "w"); 2698 if (dout == NULL) 2699 goto out; 2700 transflag++; 2701 } 2702 cprintf(dout, "%s%s\n", dirname, 2703 type == TYPE_A ? "\r" : ""); 2704 byte_count += strlen(dirname) + 1; 2705 continue; 2706 } else if (!S_ISDIR(st.st_mode)) 2707 continue; 2708 2709 if (dirname[strlen(dirname) - 1] == '/') 2710 trailingslash++; 2711 2712 if ((dirp = opendir(dirname)) == NULL) 2713 continue; 2714 2715 while ((dir = readdir(dirp)) != NULL) { 2716 char nbuf[MAXPATHLEN]; 2717 2718 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2719 continue; 2720 2721 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2722 trailingslash ? "" : "/", dir->d_name); 2723 2724 /* 2725 * We have to do a stat to ensure it's 2726 * not a directory or special file. 2727 */ 2728 /* 2729 * XXXRFC: 2730 * should we follow RFC959 and filter out 2731 * non files ? lukem - NO!, or not until 2732 * our ftp client uses MLS{T,D} for completion. 2733 */ 2734 if (simple || (stat(nbuf, &st) == 0 && 2735 S_ISREG(st.st_mode))) { 2736 char *p; 2737 2738 if (dout == NULL) { 2739 dout = dataconn("file list", (off_t)-1, 2740 "w"); 2741 if (dout == NULL) 2742 goto out; 2743 transflag++; 2744 } 2745 p = nbuf; 2746 if (nbuf[0] == '.' && nbuf[1] == '/') 2747 p = &nbuf[2]; 2748 cprintf(dout, "%s%s\n", p, 2749 type == TYPE_A ? "\r" : ""); 2750 byte_count += strlen(nbuf) + 1; 2751 } 2752 } 2753 (void) closedir(dirp); 2754 } 2755 2756 if (dout == NULL) 2757 reply(550, "No files found."); 2758 else if (ferror(dout) != 0) 2759 perror_reply(550, "Data connection"); 2760 else 2761 reply(226, "Transfer complete."); 2762 2763 cleanup_send_file_list: 2764 transflag = 0; 2765 closedataconn(dout); 2766 out: 2767 total_xfers++; 2768 total_xfers_out++; 2769 if (p) 2770 free(p); 2771 if (freeglob) 2772 globfree(&gl); 2773 } 2774 2775 char * 2776 conffilename(const char *s) 2777 { 2778 static char filename[MAXPATHLEN]; 2779 2780 if (*s == '/') 2781 strlcpy(filename, s, sizeof(filename)); 2782 else 2783 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2784 return (filename); 2785 } 2786 2787 /* 2788 * logxfer -- 2789 * if logging > 1, then based on the arguments, syslog a message: 2790 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2791 * else if file2 != NULL "<command> <file1> <file2>" 2792 * else "<command> <file1>" 2793 * if elapsed != NULL, append "in xxx.yyy seconds" 2794 * if error != NULL, append ": " + error 2795 * 2796 * if doxferlog != 0, syslog a wu-ftpd style xferlog entry 2797 */ 2798 void 2799 logxfer(const char *command, off_t bytes, const char *file1, const char *file2, 2800 const struct timeval *elapsed, const char *error) 2801 { 2802 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2803 const char *r1, *r2; 2804 char direction; 2805 size_t len; 2806 time_t now; 2807 2808 if (logging <=1 && !doxferlog) 2809 return; 2810 2811 r1 = r2 = NULL; 2812 if ((r1 = realpath(file1, realfile)) == NULL) 2813 r1 = file1; 2814 if (file2 != NULL) 2815 if ((r2 = realpath(file2, realfile)) == NULL) 2816 r2 = file2; 2817 2818 /* 2819 * syslog command 2820 */ 2821 if (logging > 1) { 2822 len = snprintf(buf, sizeof(buf), "%s %s", command, r1); 2823 if (bytes != (off_t)-1) 2824 len += snprintf(buf + len, sizeof(buf) - len, 2825 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 2826 else if (r2 != NULL) 2827 len += snprintf(buf + len, sizeof(buf) - len, 2828 " %s", r2); 2829 if (elapsed != NULL) 2830 len += snprintf(buf + len, sizeof(buf) - len, 2831 " in %ld.%.03d seconds", elapsed->tv_sec, 2832 (int)(elapsed->tv_usec / 1000)); 2833 if (error != NULL) 2834 len += snprintf(buf + len, sizeof(buf) - len, 2835 ": %s", error); 2836 syslog(LOG_INFO, "%s", buf); 2837 } 2838 2839 2840 /* 2841 * syslog wu-ftpd style log entry, prefixed with "xferlog: " 2842 */ 2843 if (!doxferlog) 2844 return; 2845 2846 if (strcmp(command, "get") == 0) 2847 direction = 'o'; 2848 else if (strcmp(command, "put") == 0 || strcmp(command, "append") == 0) 2849 direction = 'i'; 2850 else 2851 return; 2852 2853 time(&now); 2854 syslog(LOG_INFO, 2855 "xferlog%s: %.24s %ld %s " LLF " %s %c %s %c %c %s FTP 0 * %c", 2856 2857 /* 2858 * XXX: wu-ftpd puts (send) or (recv) in the syslog message, and removes 2859 * the full date. This may be problematic for accurate log parsing, 2860 * given that syslog messages don't contain the full date. 2861 */ 2862 #if 1 /* lukem's method; easier to convert to actual xferlog file */ 2863 "", 2864 ctime(&now), 2865 #else /* wu-ftpd's syslog method, with an extra unneeded space */ 2866 (direction == 'i') ? " (recv)" : " (send)", 2867 "", 2868 #endif 2869 elapsed == NULL ? 0 : elapsed->tv_sec + (elapsed->tv_usec > 0), 2870 remotehost, 2871 bytes == (off_t)-1 ? 0 : (LLT) bytes, 2872 r1, 2873 type == TYPE_A ? 'a' : 'b', 2874 "_", /* XXX: take conversions into account? */ 2875 direction, 2876 2877 curclass.type == CLASS_GUEST ? 'a' : 2878 curclass.type == CLASS_CHROOT ? 'g' : 2879 curclass.type == CLASS_REAL ? 'r' : '?', 2880 2881 curclass.type == CLASS_GUEST ? pw->pw_passwd : pw->pw_name, 2882 error != NULL ? 'i' : 'c' 2883 ); 2884 } 2885 2886 /* 2887 * Determine if `password' is valid for user given in `pw'. 2888 * Returns 2 if password expired, 1 if otherwise failed, 0 if ok 2889 */ 2890 int 2891 checkpassword(const struct passwd *pw, const char *password) 2892 { 2893 char *orig, *new; 2894 time_t expire; 2895 2896 expire = 0; 2897 if (pw == NULL) 2898 return 1; 2899 2900 orig = pw->pw_passwd; /* save existing password */ 2901 expire = pw->pw_expire; 2902 2903 if (orig[0] == '\0') /* don't allow empty passwords */ 2904 return 1; 2905 2906 new = crypt(password, orig); /* encrypt given password */ 2907 if (strcmp(new, orig) != 0) /* compare */ 2908 return 1; 2909 2910 if (expire && time(NULL) >= expire) 2911 return 2; /* check if expired */ 2912 2913 return 0; /* OK! */ 2914 } 2915 2916 char * 2917 xstrdup(const char *s) 2918 { 2919 char *new = strdup(s); 2920 2921 if (new == NULL) 2922 fatal("Local resource failure: malloc"); 2923 /* NOTREACHED */ 2924 return (new); 2925 } 2926 2927 /* 2928 * As per fprintf(), but increment total_bytes and total_bytes_out, 2929 * by the appropriate amount. 2930 */ 2931 void 2932 cprintf(FILE *fd, const char *fmt, ...) 2933 { 2934 off_t b; 2935 va_list ap; 2936 2937 va_start(ap, fmt); 2938 b = vfprintf(fd, fmt, ap); 2939 total_bytes += b; 2940 total_bytes_out += b; 2941 } 2942
Indexes created Mon Oct 13 16:09:52 GMT 2025