ftpd.c revision 1.111
1 /* $NetBSD: ftpd.c,v 1.111 2000/11/16 13:15:14 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 41 * The Regents of the University of California. All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 */ 71 72 /* 73 * Copyright (C) 1997 and 1998 WIDE Project. 74 * All rights reserved. 75 * 76 * Redistribution and use in source and binary forms, with or without 77 * modification, are permitted provided that the following conditions 78 * are met: 79 * 1. Redistributions of source code must retain the above copyright 80 * notice, this list of conditions and the following disclaimer. 81 * 2. Redistributions in binary form must reproduce the above copyright 82 * notice, this list of conditions and the following disclaimer in the 83 * documentation and/or other materials provided with the distribution. 84 * 3. Neither the name of the project nor the names of its contributors 85 * may be used to endorse or promote products derived from this software 86 * without specific prior written permission. 87 * 88 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 89 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 90 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 91 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 92 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 93 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 94 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 95 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 96 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 97 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 98 * SUCH DAMAGE. 99 */ 100 101 #include <sys/cdefs.h> 102 #ifndef lint 103 __COPYRIGHT( 104 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 105 The Regents of the University of California. All rights reserved.\n"); 106 #endif /* not lint */ 107 108 #ifndef lint 109 #if 0 110 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 111 #else 112 __RCSID("$NetBSD: ftpd.c,v 1.111 2000/11/16 13:15:14 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 <unistd.h> 154 #include <util.h> 155 #include <utmp.h> 156 #ifdef SKEY 157 #include <skey.h> 158 #endif 159 #ifdef KERBEROS5 160 #include <com_err.h> 161 #include <krb5/krb5.h> 162 #endif 163 164 #define GLOBAL 165 #include "extern.h" 166 #include "pathnames.h" 167 #include "version.h" 168 169 int data; 170 jmp_buf urgcatch; 171 struct passwd *pw; 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 dropprivs; /* if privileges should or have been dropped */ 180 int mapped; /* IPv4 connection on AF_INET6 socket */ 181 off_t file_size; 182 off_t byte_count; 183 static char ttyline[20]; 184 static struct utmp utmp; /* for utmp */ 185 186 static const char *anondir = NULL; 187 static const char *confdir = NULL; 188 189 #if defined(KERBEROS) || defined(KERBEROS5) 190 int has_ccache = 0; 191 int notickets = 1; 192 char *krbtkfile_env = NULL; 193 char *tty = ttyline; 194 int login_krb5_forwardable_tgt = 0; 195 #endif 196 197 int epsvall = 0; 198 199 /* 200 * Timeout intervals for retrying connections 201 * to hosts that don't accept PORT cmds. This 202 * is a kludge, but given the problems with TCP... 203 */ 204 #define SWAITMAX 90 /* wait at most 90 seconds */ 205 #define SWAITINT 5 /* interval between retries */ 206 207 int swaitmax = SWAITMAX; 208 int swaitint = SWAITINT; 209 210 static int bind_pasv_addr(void); 211 static int checkuser(const char *, const char *, int, int, char **); 212 static int checkaccess(const char *); 213 static void dolog(struct sockaddr *); 214 static void end_login(void); 215 static FILE *getdatasock(const char *); 216 static char *gunique(const char *); 217 static void lostconn(int); 218 static void myoob(int); 219 static int receive_data(FILE *, FILE *); 220 static int send_data(FILE *, FILE *, off_t, int); 221 static struct passwd *sgetpwnam(const char *); 222 223 int main(int, char *[]); 224 225 #if defined(KERBEROS) 226 int klogin(struct passwd *, char *, char *, char *); 227 void kdestroy(void); 228 #endif 229 #if defined(KERBEROS5) 230 int k5login(struct passwd *, char *, char *, char *); 231 void k5destroy(void); 232 #endif 233 234 int 235 main(int argc, char *argv[]) 236 { 237 int addrlen, ch, on = 1, tos, keepalive; 238 #ifdef KERBEROS5 239 krb5_error_code kerror; 240 #endif 241 char *p; 242 243 connections = 1; 244 debug = 0; 245 logging = 0; 246 pdata = -1; 247 sflag = 0; 248 dataport = 0; 249 dopidfile = 1; /* default: DO use a pid file to count users */ 250 doutmp = 0; /* default: don't log to utmp */ 251 dowtmp = 1; /* default: DO log to wtmp */ 252 dropprivs = 0; 253 mapped = 0; 254 usedefault = 1; 255 emailaddr = NULL; 256 hostname[0] = '\0'; 257 homedir[0] = '\0'; 258 gidcount = 0; 259 version = FTPD_VERSION; 260 261 /* 262 * LOG_NDELAY sets up the logging connection immediately, 263 * necessary for anonymous ftp's that chroot and can't do it later. 264 */ 265 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 266 267 while ((ch = getopt(argc, argv, "a:c:C:de:h:HlP:qQrst:T:uUvV:wW")) 268 != -1) { 269 switch (ch) { 270 case 'a': 271 anondir = optarg; 272 break; 273 274 case 'c': 275 confdir = optarg; 276 break; 277 278 case 'C': 279 pw = sgetpwnam(optarg); 280 exit(checkaccess(optarg) ? 0 : 1); 281 /* NOTREACHED */ 282 283 case 'd': 284 case 'v': /* deprecated */ 285 debug = 1; 286 break; 287 288 case 'e': 289 emailaddr = optarg; 290 break; 291 292 case 'h': 293 strlcpy(hostname, optarg, sizeof(hostname)); 294 break; 295 296 case 'H': 297 if (gethostname(hostname, sizeof(hostname)) == -1) 298 hostname[0] = '\0'; 299 hostname[sizeof(hostname) - 1] = '\0'; 300 break; 301 302 case 'l': 303 logging++; /* > 1 == extra logging */ 304 break; 305 306 case 'P': 307 dataport = (int)strtol(optarg, &p, 10); 308 if (*p != '\0' || dataport < IPPORT_RESERVED || 309 dataport > IPPORT_ANONMAX) { 310 syslog(LOG_WARNING, "Invalid dataport %s", 311 optarg); 312 dataport = 0; 313 } 314 break; 315 316 case 'q': 317 dopidfile = 1; 318 break; 319 320 case 'Q': 321 dopidfile = 0; 322 break; 323 324 case 'r': 325 dropprivs = 1; 326 break; 327 328 case 's': 329 sflag = 1; 330 break; 331 332 case 't': 333 case 'T': 334 syslog(LOG_ERR, 335 "-%c has been deprecated in favour of ftpd.conf", 336 ch); 337 break; 338 339 case 'u': 340 doutmp = 1; 341 break; 342 343 case 'U': 344 doutmp = 0; 345 break; 346 347 case 'V': 348 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 349 version = NULL; 350 else 351 version = xstrdup(optarg); 352 break; 353 354 case 'w': 355 dowtmp = 1; 356 break; 357 358 case 'W': 359 dowtmp = 0; 360 break; 361 362 default: 363 if (optopt == 'a' || optopt == 'C') 364 exit(1); 365 syslog(LOG_ERR, "unknown flag -%c ignored", optopt); 366 break; 367 } 368 } 369 if (EMPTYSTR(confdir)) 370 confdir = _DEFAULT_CONFDIR; 371 372 memset((char *)&his_addr, 0, sizeof (his_addr)); 373 addrlen = sizeof(his_addr.si_su); 374 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 375 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 376 exit(1); 377 } 378 his_addr.su_len = addrlen; 379 memset((char *)&ctrl_addr, 0, sizeof (ctrl_addr)); 380 addrlen = sizeof(ctrl_addr.si_su); 381 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 382 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 383 exit(1); 384 } 385 ctrl_addr.su_len = addrlen; 386 #ifdef INET6 387 if (his_addr.su_family == AF_INET6 388 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 389 #if 1 390 /* 391 * IPv4 control connection arrived to AF_INET6 socket. 392 * I hate to do this, but this is the easiest solution. 393 * 394 * The assumption is untrue on SIIT environment. 395 */ 396 struct sockinet tmp_addr; 397 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 398 399 tmp_addr = his_addr; 400 memset(&his_addr, 0, sizeof(his_addr)); 401 his_addr.su_family = AF_INET; 402 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 403 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 404 sizeof(his_addr.su_addr)); 405 his_addr.su_port = tmp_addr.su_port; 406 407 tmp_addr = ctrl_addr; 408 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 409 ctrl_addr.su_family = AF_INET; 410 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 411 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 412 sizeof(ctrl_addr.su_addr)); 413 ctrl_addr.su_port = tmp_addr.su_port; 414 #else 415 while (fgets(line, sizeof(line), fd) != NULL) { 416 if ((cp = strchr(line, '\n')) != NULL) 417 *cp = '\0'; 418 reply(-530, "%s", line); 419 } 420 (void) fflush(stdout); 421 (void) fclose(fd); 422 reply(530, 423 "Connection from IPv4 mapped address is not supported."); 424 exit(0); 425 #endif 426 427 mapped = 1; 428 } else 429 #endif /* INET6 */ 430 mapped = 0; 431 #ifdef IP_TOS 432 if (!mapped && his_addr.su_family == AF_INET) { 433 tos = IPTOS_LOWDELAY; 434 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 435 sizeof(int)) < 0) 436 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 437 } 438 #endif 439 /* if the hostname hasn't been given, attempt to determine it */ 440 if (hostname[0] == '\0') { 441 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 442 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 0) 443 != 0) 444 (void)gethostname(hostname, sizeof(hostname)); 445 hostname[sizeof(hostname) - 1] = '\0'; 446 } 447 448 /* set this here so klogin can use it... */ 449 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 450 451 (void) freopen(_PATH_DEVNULL, "w", stderr); 452 (void) signal(SIGPIPE, lostconn); 453 (void) signal(SIGCHLD, SIG_IGN); 454 if (signal(SIGURG, myoob) == SIG_ERR) 455 syslog(LOG_ERR, "signal: %m"); 456 457 /* Try to handle urgent data inline */ 458 #ifdef SO_OOBINLINE 459 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 460 syslog(LOG_ERR, "setsockopt: %m"); 461 #endif 462 /* Set keepalives on the socket to detect dropped connections. */ 463 #ifdef SO_KEEPALIVE 464 keepalive = 1; 465 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 466 sizeof(int)) < 0) 467 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 468 #endif 469 470 #ifdef F_SETOWN 471 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 472 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 473 #endif 474 dolog((struct sockaddr *)&his_addr); 475 /* 476 * Set up default state 477 */ 478 data = -1; 479 type = TYPE_A; 480 form = FORM_N; 481 stru = STRU_F; 482 mode = MODE_S; 483 tmpline[0] = '\0'; 484 hasyyerrored = 0; 485 486 #ifdef KERBEROS5 487 kerror = krb5_init_context(&kcontext); 488 if (kerror) { 489 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 490 error_message(kerror)); 491 exit(0); 492 } 493 #endif /* KERBEROS5 */ 494 495 init_curclass(); 496 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 497 curclass.type = CLASS_REAL; 498 499 /* If logins are disabled, print out the message. */ 500 if (display_file(_PATH_NOLOGIN, 530)) { 501 reply(530, "System not available."); 502 exit(0); 503 } 504 (void)display_file(conffilename(_PATH_FTPWELCOME), 220); 505 /* reply(220,) must follow */ 506 if (EMPTYSTR(version)) 507 reply(220, "%s FTP server ready.", hostname); 508 else 509 reply(220, "%s FTP server (%s) ready.", hostname, version); 510 511 (void) setjmp(errcatch); 512 for (;;) 513 (void) yyparse(); 514 /* NOTREACHED */ 515 } 516 517 static void 518 lostconn(int signo) 519 { 520 521 if (debug) 522 syslog(LOG_DEBUG, "lost connection"); 523 dologout(1); 524 } 525 526 /* 527 * Save the result of a getpwnam. Used for USER command, since 528 * the data returned must not be clobbered by any other command 529 * (e.g., globbing). 530 */ 531 static struct passwd * 532 sgetpwnam(const char *name) 533 { 534 static struct passwd save; 535 struct passwd *p; 536 537 if ((p = getpwnam(name)) == NULL) 538 return (p); 539 if (save.pw_name) { 540 free((char *)save.pw_name); 541 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 542 free((char *)save.pw_passwd); 543 free((char *)save.pw_gecos); 544 free((char *)save.pw_dir); 545 free((char *)save.pw_shell); 546 } 547 save = *p; 548 save.pw_name = xstrdup(p->pw_name); 549 save.pw_passwd = xstrdup(p->pw_passwd); 550 save.pw_gecos = xstrdup(p->pw_gecos); 551 save.pw_dir = xstrdup(p->pw_dir); 552 save.pw_shell = xstrdup(p->pw_shell); 553 return (&save); 554 } 555 556 static int login_attempts; /* number of failed login attempts */ 557 static int askpasswd; /* had user command, ask for passwd */ 558 static char curname[10]; /* current USER name */ 559 560 /* 561 * USER command. 562 * Sets global passwd pointer pw if named account exists and is acceptable; 563 * sets askpasswd if a PASS command is expected. If logged in previously, 564 * need to reset state. If name is "ftp" or "anonymous", the name is not in 565 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 566 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 567 * requesting login privileges. Disallow anyone who does not have a standard 568 * shell as returned by getusershell(). Disallow anyone mentioned in the file 569 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 570 */ 571 void 572 user(const char *name) 573 { 574 if (logged_in) { 575 switch (curclass.type) { 576 case CLASS_GUEST: 577 reply(530, "Can't change user from guest login."); 578 return; 579 case CLASS_CHROOT: 580 reply(530, "Can't change user from chroot user."); 581 return; 582 case CLASS_REAL: 583 if (dropprivs) { 584 reply(530, "Can't change user."); 585 return; 586 } 587 end_login(); 588 break; 589 default: 590 abort(); 591 } 592 } 593 594 #if defined(KERBEROS) 595 kdestroy(); 596 #endif 597 #if defined(KERBEROS5) 598 k5destroy(); 599 #endif 600 601 curclass.type = CLASS_REAL; 602 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 603 /* need `pw' setup for checkaccess() and checkuser () */ 604 if ((pw = sgetpwnam("ftp")) == NULL) 605 reply(530, "User %s unknown.", name); 606 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 607 reply(530, "User %s access denied.", name); 608 else { 609 curclass.type = CLASS_GUEST; 610 askpasswd = 1; 611 reply(331, 612 "Guest login ok, type your name as password."); 613 } 614 if (!askpasswd && logging) 615 syslog(LOG_NOTICE, 616 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 617 return; 618 } 619 620 pw = sgetpwnam(name); 621 if (logging) 622 strlcpy(curname, name, sizeof(curname)); 623 624 #ifdef SKEY 625 if (skey_haskey(name) == 0) { 626 const char *myskey; 627 628 myskey = skey_keyinfo(name); 629 reply(331, "Password [%s] required for %s.", 630 myskey ? myskey : "error getting challenge", name); 631 } else 632 #endif 633 reply(331, "Password required for %s.", name); 634 635 askpasswd = 1; 636 /* 637 * Delay before reading passwd after first failed 638 * attempt to slow down passwd-guessing programs. 639 */ 640 if (login_attempts) 641 sleep((unsigned) login_attempts); 642 } 643 644 /* 645 * Determine whether something is to happen (allow access, chroot) 646 * for a user. Each line is a shell-style glob followed by 647 * `yes' or `no'. 648 * 649 * For backward compatability, `allow' and `deny' are synonymns 650 * for `yes' and `no', respectively. 651 * 652 * Each glob is matched against the username in turn, and the first 653 * match found is used. If no match is found, the result is the 654 * argument `def'. If a match is found but without and explicit 655 * `yes'/`no', the result is the opposite of def. 656 * 657 * If the file doesn't exist at all, the result is the argument 658 * `nofile' 659 * 660 * Any line starting with `#' is considered a comment and ignored. 661 * 662 * Returns 0 if the user is denied, or 1 if they are allowed. 663 * 664 * NOTE: needs struct passwd *pw setup before use. 665 */ 666 int 667 checkuser(const char *fname, const char *name, int def, int nofile, 668 char **retclass) 669 { 670 FILE *fd; 671 int retval; 672 char *glob, *perm, *class, *buf, *p; 673 size_t len, line; 674 675 retval = def; 676 if (retclass != NULL) 677 *retclass = NULL; 678 if ((fd = fopen(conffilename(fname), "r")) == NULL) 679 return nofile; 680 681 line = 0; 682 for (; 683 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 684 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 685 free(buf), buf = NULL) { 686 glob = perm = class = NULL; 687 p = buf; 688 if (len < 1) 689 continue; 690 if (p[len - 1] == '\n') 691 p[--len] = '\0'; 692 if (EMPTYSTR(p)) 693 continue; 694 695 NEXTWORD(p, glob); 696 NEXTWORD(p, perm); 697 NEXTWORD(p, class); 698 if (EMPTYSTR(glob)) 699 continue; 700 if (!EMPTYSTR(class)) { 701 if (strcasecmp(class, "all") == 0 || 702 strcasecmp(class, "none") == 0) { 703 syslog(LOG_WARNING, 704 "%s line %d: illegal user-defined class `%s' - skipping entry", 705 fname, (int)line, class); 706 continue; 707 } 708 } 709 710 /* have a host specifier */ 711 if ((p = strchr(glob, '@')) != NULL) { 712 unsigned long net, mask, addr; 713 int bits; 714 715 *p++ = '\0'; 716 /* check against network or CIDR */ 717 if (isdigit(*p) && 718 (bits = inet_net_pton(AF_INET, p, 719 &net, sizeof(net))) != -1) { 720 net = ntohl(net); 721 mask = 0xffffffffU << (32 - bits); 722 addr = ntohl(his_addr.su_addr.s_addr); 723 if ((addr & mask) != net) 724 continue; 725 726 /* check against hostname glob */ 727 } else if (fnmatch(p, remotehost, 0) != 0) 728 continue; 729 } 730 731 /* have a group specifier */ 732 if ((p = strchr(glob, ':')) != NULL) { 733 gid_t *groups, *ng; 734 int gsize, i, found; 735 736 *p++ = '\0'; 737 groups = NULL; 738 gsize = 16; 739 do { 740 ng = realloc(groups, gsize * sizeof(gid_t)); 741 if (ng == NULL) 742 fatal( 743 "Local resource failure: realloc"); 744 groups = ng; 745 } while (getgrouplist(pw->pw_name, pw->pw_gid, 746 groups, &gsize) == -1); 747 found = 0; 748 for (i = 0; i < gsize; i++) { 749 struct group *g; 750 751 if ((g = getgrgid(groups[i])) == NULL) 752 continue; 753 if (fnmatch(p, g->gr_name, 0) == 0) { 754 found = 1; 755 break; 756 } 757 } 758 free(groups); 759 if (!found) 760 continue; 761 } 762 763 /* check against username glob */ 764 if (fnmatch(glob, name, 0) != 0) 765 continue; 766 767 if (perm != NULL && 768 ((strcasecmp(perm, "allow") == 0) || 769 (strcasecmp(perm, "yes") == 0))) 770 retval = 1; 771 else if (perm != NULL && 772 ((strcasecmp(perm, "deny") == 0) || 773 (strcasecmp(perm, "no") == 0))) 774 retval = 0; 775 else 776 retval = !def; 777 if (!EMPTYSTR(class) && retclass != NULL) 778 *retclass = xstrdup(class); 779 free(buf); 780 break; 781 } 782 (void) fclose(fd); 783 return (retval); 784 } 785 786 /* 787 * Check if user is allowed by /etc/ftpusers 788 * returns 1 for yes, 0 for no 789 * 790 * NOTE: needs struct passwd *pw setup (for checkuser()) 791 */ 792 int 793 checkaccess(const char *name) 794 { 795 796 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 797 } 798 799 /* 800 * Terminate login as previous user, if any, resetting state; 801 * used when USER command is given or login fails. 802 */ 803 static void 804 end_login(void) 805 { 806 807 if (logged_in) { 808 if (dowtmp) 809 logwtmp(ttyline, "", ""); 810 if (doutmp) 811 logout(utmp.ut_line); 812 } 813 /* reset login state */ 814 (void) seteuid((uid_t)0); 815 pw = NULL; 816 logged_in = 0; 817 quietmessages = 0; 818 gidcount = 0; 819 curclass.type = CLASS_REAL; 820 } 821 822 void 823 pass(const char *passwd) 824 { 825 int rval; 826 const char *cp, *shell; 827 char *class, root[MAXPATHLEN]; 828 829 class = NULL; 830 if (logged_in || askpasswd == 0) { 831 reply(503, "Login with USER first."); 832 return; 833 } 834 askpasswd = 0; 835 if (curclass.type != CLASS_GUEST) { 836 /* "ftp" is the only account allowed with no password */ 837 if (pw == NULL) { 838 rval = 1; /* failure below */ 839 goto skip; 840 } 841 #if defined(KERBEROS) 842 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 843 rval = 0; 844 goto skip; 845 } 846 #endif 847 #if defined(KERBEROS5) 848 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 849 rval = 0; 850 goto skip; 851 } 852 #endif 853 #ifdef SKEY 854 if (skey_haskey(pw->pw_name) == 0) { 855 char *p; 856 int r; 857 858 p = xstrdup(passwd); 859 r = skey_passcheck(pw->pw_name, p); 860 free(p); 861 if (r != -1) { 862 rval = 0; 863 goto skip; 864 } 865 } 866 #endif 867 if (!sflag && *pw->pw_passwd != '\0' && 868 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 869 rval = 0; 870 goto skip; 871 } 872 rval = 1; 873 874 skip: 875 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 876 rval = 2; 877 878 /* 879 * If rval > 0, the user failed the authentication check 880 * above. If rval == 0, either Kerberos or local 881 * authentication succeeded. 882 */ 883 if (rval) { 884 reply(530, "%s", rval == 2 ? "Password expired." : 885 "Login incorrect."); 886 if (logging) { 887 syslog(LOG_NOTICE, 888 "FTP LOGIN FAILED FROM %s", remotehost); 889 syslog(LOG_AUTHPRIV | LOG_NOTICE, 890 "FTP LOGIN FAILED FROM %s, %s", 891 remotehost, curname); 892 } 893 pw = NULL; 894 if (login_attempts++ >= 5) { 895 syslog(LOG_NOTICE, 896 "repeated login failures from %s", 897 remotehost); 898 exit(0); 899 } 900 return; 901 } 902 } 903 904 /* password ok; see if anything else prevents login */ 905 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 906 reply(530, "User %s may not use FTP.", pw->pw_name); 907 if (logging) 908 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 909 remotehost, pw->pw_name); 910 goto bad; 911 } 912 /* if not guest user, check for valid shell */ 913 if ((shell = pw->pw_shell) == NULL || *shell == 0) 914 shell = _PATH_BSHELL; 915 while ((cp = getusershell()) != NULL) 916 if (strcmp(cp, shell) == 0) 917 break; 918 endusershell(); 919 if (cp == NULL && curclass.type != CLASS_GUEST) { 920 reply(530, "User %s may not use FTP.", pw->pw_name); 921 if (logging) 922 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 923 remotehost, pw->pw_name); 924 goto bad; 925 } 926 927 login_attempts = 0; /* this time successful */ 928 if (setegid((gid_t)pw->pw_gid) < 0) { 929 reply(550, "Can't set gid."); 930 goto bad; 931 } 932 (void) initgroups(pw->pw_name, pw->pw_gid); 933 /* cache groups for cmds.c::matchgroup() */ 934 gidcount = getgroups(sizeof(gidlist), gidlist); 935 936 /* open wtmp before chroot */ 937 if (dowtmp) 938 logwtmp(ttyline, pw->pw_name, remotehost); 939 940 /* open utmp before chroot */ 941 if (doutmp) { 942 memset((void *)&utmp, 0, sizeof(utmp)); 943 (void)time(&utmp.ut_time); 944 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 945 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 946 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 947 login(&utmp); 948 } 949 950 logged_in = 1; 951 952 /* check user in /etc/ftpchroot */ 953 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 954 if (curclass.type == CLASS_GUEST) { 955 syslog(LOG_NOTICE, 956 "Can't change guest user to chroot class; remove entry in %s", 957 _PATH_FTPCHROOT); 958 exit(1); 959 } 960 curclass.type = CLASS_CHROOT; 961 } 962 if (class == NULL) { 963 switch (curclass.type) { 964 case CLASS_GUEST: 965 class = xstrdup("guest"); 966 break; 967 case CLASS_CHROOT: 968 class = xstrdup("chroot"); 969 break; 970 case CLASS_REAL: 971 class = xstrdup("real"); 972 break; 973 default: 974 abort(); 975 } 976 } 977 978 /* parse ftpd.conf, setting up various parameters */ 979 parse_conf(class); 980 connections = 1; 981 if (dopidfile) 982 count_users(); 983 if (curclass.limit != -1 && connections > curclass.limit) { 984 if (! EMPTYSTR(curclass.limitfile)) 985 (void)display_file(conffilename(curclass.limitfile), 986 530); 987 reply(530, 988 "User %s access denied, connection limit of %d reached.", 989 pw->pw_name, curclass.limit); 990 syslog(LOG_NOTICE, 991 "Maximum connection limit of %d for class %s reached, login refused for %s", 992 curclass.limit, curclass.classname, pw->pw_name); 993 goto bad; 994 } 995 996 homedir[0] = '/'; 997 switch (curclass.type) { 998 case CLASS_GUEST: 999 /* 1000 * We MUST do a chdir() after the chroot. Otherwise 1001 * the old current directory will be accessible as "." 1002 * outside the new root! 1003 */ 1004 format_path(root, 1005 curclass.chroot ? curclass.chroot : 1006 anondir ? anondir : 1007 pw->pw_dir); 1008 format_path(homedir, 1009 curclass.homedir ? curclass.homedir : 1010 "/"); 1011 if (EMPTYSTR(homedir)) 1012 homedir[0] = '/'; 1013 if (EMPTYSTR(root) || chroot(root) < 0) { 1014 syslog(LOG_NOTICE, 1015 "GUEST user %s: can't chroot to %s: %m", 1016 pw->pw_name, root); 1017 goto bad_guest; 1018 } 1019 if (chdir(homedir) < 0) { 1020 syslog(LOG_NOTICE, 1021 "GUEST user %s: can't chdir to %s: %m", 1022 pw->pw_name, homedir); 1023 bad_guest: 1024 reply(550, "Can't set guest privileges."); 1025 goto bad; 1026 } 1027 break; 1028 case CLASS_CHROOT: 1029 format_path(root, 1030 curclass.chroot ? curclass.chroot : 1031 pw->pw_dir); 1032 format_path(homedir, 1033 curclass.homedir ? curclass.homedir : 1034 "/"); 1035 if (EMPTYSTR(homedir)) 1036 homedir[0] = '/'; 1037 if (EMPTYSTR(root) || chroot(root) < 0) { 1038 syslog(LOG_NOTICE, 1039 "CHROOT user %s: can't chroot to %s: %m", 1040 pw->pw_name, root); 1041 goto bad_chroot; 1042 } 1043 if (chdir(homedir) < 0) { 1044 syslog(LOG_NOTICE, 1045 "CHROOT user %s: can't chdir to %s: %m", 1046 pw->pw_name, homedir); 1047 bad_chroot: 1048 reply(550, "Can't change root."); 1049 goto bad; 1050 } 1051 break; 1052 case CLASS_REAL: 1053 format_path(homedir, 1054 curclass.homedir ? curclass.homedir : 1055 pw->pw_dir); 1056 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1057 if (chdir("/") < 0) { 1058 syslog(LOG_NOTICE, 1059 "REAL user %s: can't chdir to %s: %m", 1060 pw->pw_name, 1061 !EMPTYSTR(homedir) ? homedir : "/"); 1062 reply(530, 1063 "User %s: can't change directory to %s.", 1064 pw->pw_name, 1065 !EMPTYSTR(homedir) ? homedir : "/"); 1066 goto bad; 1067 } else { 1068 reply(-230, 1069 "No directory! Logging in with home=/"); 1070 homedir[0] = '/'; 1071 } 1072 } 1073 break; 1074 } 1075 setlogin(pw->pw_name); 1076 if (dropprivs || 1077 (curclass.type != CLASS_REAL && 1078 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1079 dropprivs++; 1080 if (setgid((gid_t)pw->pw_gid) < 0) { 1081 reply(550, "Can't set gid."); 1082 goto bad; 1083 } 1084 if (setuid((uid_t)pw->pw_uid) < 0) { 1085 reply(550, "Can't set uid."); 1086 goto bad; 1087 } 1088 } else { 1089 if (seteuid((uid_t)pw->pw_uid) < 0) { 1090 reply(550, "Can't set uid."); 1091 goto bad; 1092 } 1093 } 1094 setenv("HOME", homedir, 1); 1095 1096 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1097 quietmessages = 1; 1098 1099 /* 1100 * Display a login message, if it exists. 1101 * N.B. reply(230,) must follow the message. 1102 */ 1103 (void)display_file(conffilename(curclass.motd), 230); 1104 show_chdir_messages(230); 1105 if (curclass.type == CLASS_GUEST) { 1106 reply(230, "Guest login ok, access restrictions apply."); 1107 #ifdef HASSETPROCTITLE 1108 snprintf(proctitle, sizeof(proctitle), 1109 "%s: anonymous/%.*s", remotehost, 1110 (int) (sizeof(proctitle) - sizeof(remotehost) - 1111 sizeof(": anonymous/")), passwd); 1112 setproctitle("%s", proctitle); 1113 #endif /* HASSETPROCTITLE */ 1114 if (logging) 1115 syslog(LOG_INFO, 1116 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1117 remotehost, passwd, 1118 curclass.classname, CURCLASSTYPE); 1119 } else { 1120 reply(230, "User %s logged in.", pw->pw_name); 1121 #ifdef HASSETPROCTITLE 1122 snprintf(proctitle, sizeof(proctitle), 1123 "%s: %s", remotehost, pw->pw_name); 1124 setproctitle("%s", proctitle); 1125 #endif /* HASSETPROCTITLE */ 1126 if (logging) 1127 syslog(LOG_INFO, 1128 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1129 remotehost, pw->pw_name, 1130 curclass.classname, CURCLASSTYPE); 1131 } 1132 (void) umask(curclass.umask); 1133 goto cleanuppass; 1134 1135 bad: 1136 /* Forget all about it... */ 1137 end_login(); 1138 1139 cleanuppass: 1140 if (class) 1141 free(class); 1142 } 1143 1144 void 1145 retrieve(char *argv[], const char *name) 1146 { 1147 FILE *fin, *dout; 1148 struct stat st; 1149 int (*closefunc)(FILE *) = NULL; 1150 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1151 struct timeval start, finish, td, *tdp; 1152 const char *dispname; 1153 1154 sendrv = closerv = stderrfd = -1; 1155 isconversion = isdata = isls = log = 0; 1156 tdp = NULL; 1157 dispname = name; 1158 fin = dout = NULL; 1159 if (argv == NULL) { 1160 log = 1; 1161 isdata = 1; 1162 fin = fopen(name, "r"); 1163 closefunc = fclose; 1164 if (fin == NULL) 1165 argv = do_conversion(name); 1166 if (argv != NULL) { 1167 isconversion++; 1168 syslog(LOG_INFO, "get command: '%s' on '%s'", 1169 argv[0], name); 1170 } 1171 } 1172 if (argv != NULL) { 1173 char temp[MAXPATHLEN]; 1174 1175 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1176 isls = 1; 1177 stderrfd = -1; 1178 } else { 1179 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1180 stderrfd = mkstemp(temp); 1181 if (stderrfd != -1) 1182 (void)unlink(temp); 1183 } 1184 dispname = argv[0]; 1185 fin = ftpd_popen(argv, "r", stderrfd); 1186 closefunc = ftpd_pclose; 1187 st.st_size = -1; 1188 st.st_blksize = BUFSIZ; 1189 } 1190 if (fin == NULL) { 1191 if (errno != 0) { 1192 perror_reply(550, dispname); 1193 if (log) 1194 logcmd("get", -1, name, NULL, NULL, 1195 strerror(errno)); 1196 } 1197 goto cleanupretrieve; 1198 } 1199 byte_count = -1; 1200 if (argv == NULL 1201 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1202 reply(550, "%s: not a plain file.", dispname); 1203 goto done; 1204 } 1205 if (restart_point) { 1206 if (type == TYPE_A) { 1207 off_t i; 1208 int c; 1209 1210 for (i = 0; i < restart_point; i++) { 1211 if ((c=getc(fin)) == EOF) { 1212 perror_reply(550, dispname); 1213 goto done; 1214 } 1215 if (c == '\n') 1216 i++; 1217 } 1218 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1219 perror_reply(550, dispname); 1220 goto done; 1221 } 1222 } 1223 dout = dataconn(dispname, st.st_size, "w"); 1224 if (dout == NULL) 1225 goto done; 1226 1227 (void)gettimeofday(&start, NULL); 1228 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1229 (void)gettimeofday(&finish, NULL); 1230 (void) fclose(dout); /* close now to affect timing stats */ 1231 dout = NULL; 1232 timersub(&finish, &start, &td); 1233 tdp = &td; 1234 done: 1235 if (log) 1236 logcmd("get", byte_count, name, NULL, tdp, NULL); 1237 closerv = (*closefunc)(fin); 1238 if (sendrv == 0) { 1239 FILE *err; 1240 struct stat sb; 1241 1242 if (!isls && argv != NULL && closerv != 0) { 1243 reply(-226, 1244 "Command returned an exit status of %d", 1245 closerv); 1246 if (isconversion) 1247 syslog(LOG_INFO, 1248 "retrieve command: '%s' returned %d", 1249 argv[0], closerv); 1250 } 1251 if (!isls && argv != NULL && stderrfd != -1 && 1252 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1253 ((err = fdopen(stderrfd, "r")) != NULL)) { 1254 char *cp, line[LINE_MAX]; 1255 1256 reply(-226, "Command error messages:"); 1257 rewind(err); 1258 while (fgets(line, sizeof(line), err) != NULL) { 1259 if ((cp = strchr(line, '\n')) != NULL) 1260 *cp = '\0'; 1261 reply(0, " %s", line); 1262 } 1263 (void) fflush(stdout); 1264 (void) fclose(err); 1265 /* a reply(226,) must follow */ 1266 } 1267 reply(226, "Transfer complete."); 1268 } 1269 cleanupretrieve: 1270 closedataconn(dout); 1271 if (stderrfd != -1) 1272 (void)close(stderrfd); 1273 if (isconversion) 1274 free(argv); 1275 } 1276 1277 void 1278 store(const char *name, const char *mode, int unique) 1279 { 1280 FILE *fout, *din; 1281 struct stat st; 1282 int (*closefunc)(FILE *); 1283 struct timeval start, finish, td, *tdp; 1284 char *desc; 1285 1286 din = NULL; 1287 desc = (*mode == 'w') ? "put" : "append"; 1288 if (unique && stat(name, &st) == 0 && 1289 (name = gunique(name)) == NULL) { 1290 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1291 goto cleanupstore; 1292 } 1293 1294 if (restart_point) 1295 mode = "r+"; 1296 fout = fopen(name, mode); 1297 closefunc = fclose; 1298 tdp = NULL; 1299 if (fout == NULL) { 1300 perror_reply(553, name); 1301 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1302 goto cleanupstore; 1303 } 1304 byte_count = -1; 1305 if (restart_point) { 1306 if (type == TYPE_A) { 1307 off_t i; 1308 int c; 1309 1310 for (i = 0; i < restart_point; i++) { 1311 if ((c=getc(fout)) == EOF) { 1312 perror_reply(550, name); 1313 goto done; 1314 } 1315 if (c == '\n') 1316 i++; 1317 } 1318 /* 1319 * We must do this seek to "current" position 1320 * because we are changing from reading to 1321 * writing. 1322 */ 1323 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1324 perror_reply(550, name); 1325 goto done; 1326 } 1327 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1328 perror_reply(550, name); 1329 goto done; 1330 } 1331 } 1332 din = dataconn(name, (off_t)-1, "r"); 1333 if (din == NULL) 1334 goto done; 1335 (void)gettimeofday(&start, NULL); 1336 if (receive_data(din, fout) == 0) { 1337 if (unique) 1338 reply(226, "Transfer complete (unique file name:%s).", 1339 name); 1340 else 1341 reply(226, "Transfer complete."); 1342 } 1343 (void)gettimeofday(&finish, NULL); 1344 (void) fclose(din); /* close now to affect timing stats */ 1345 din = NULL; 1346 timersub(&finish, &start, &td); 1347 tdp = &td; 1348 done: 1349 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1350 (*closefunc)(fout); 1351 cleanupstore: 1352 closedataconn(din); 1353 } 1354 1355 static FILE * 1356 getdatasock(const char *mode) 1357 { 1358 int on, s, t, tries; 1359 in_port_t port; 1360 1361 on = 1; 1362 if (data >= 0) 1363 return (fdopen(data, mode)); 1364 if (! dropprivs) 1365 (void) seteuid((uid_t)0); 1366 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1367 if (s < 0) 1368 goto bad; 1369 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1370 (char *) &on, sizeof(on)) < 0) 1371 goto bad; 1372 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1373 (char *) &on, sizeof(on)) < 0) 1374 goto bad; 1375 /* anchor socket to avoid multi-homing problems */ 1376 data_source = ctrl_addr; 1377 /* 1378 * By default source port for PORT connctions is 1379 * ctrlport-1 (see RFC959 section 5.2). 1380 * However, if privs have been dropped and that 1381 * would be < IPPORT_RESERVED, use a random port 1382 * instead. 1383 */ 1384 if (dataport) 1385 port = dataport; 1386 else 1387 port = ntohs(ctrl_addr.su_port) - 1; 1388 if (dropprivs && port < IPPORT_RESERVED) 1389 port = 0; /* use random port */ 1390 data_source.su_port = htons(port); 1391 1392 for (tries = 1; ; tries++) { 1393 if (bind(s, (struct sockaddr *)&data_source.si_su, 1394 data_source.su_len) >= 0) 1395 break; 1396 if (errno != EADDRINUSE || tries > 10) 1397 goto bad; 1398 sleep(tries); 1399 } 1400 if (! dropprivs) 1401 (void) seteuid((uid_t)pw->pw_uid); 1402 #ifdef IP_TOS 1403 if (!mapped && ctrl_addr.su_family == AF_INET) { 1404 on = IPTOS_THROUGHPUT; 1405 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1406 sizeof(int)) < 0) 1407 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1408 } 1409 #endif 1410 return (fdopen(s, mode)); 1411 bad: 1412 /* Return the real value of errno (close may change it) */ 1413 t = errno; 1414 if (! dropprivs) 1415 (void) seteuid((uid_t)pw->pw_uid); 1416 (void) close(s); 1417 errno = t; 1418 return (NULL); 1419 } 1420 1421 FILE * 1422 dataconn(const char *name, off_t size, const char *mode) 1423 { 1424 char sizebuf[32]; 1425 FILE *file; 1426 int retry = 0, tos, keepalive; 1427 1428 file_size = size; 1429 byte_count = 0; 1430 if (size != (off_t) -1) 1431 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1432 (LLT)size, PLURAL(size)); 1433 else 1434 sizebuf[0] = '\0'; 1435 if (pdata >= 0) { 1436 struct sockinet from; 1437 int s, fromlen = sizeof(from.su_len); 1438 1439 (void) alarm(curclass.timeout); 1440 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 1441 (void) alarm(0); 1442 if (s < 0) { 1443 reply(425, "Can't open data connection."); 1444 (void) close(pdata); 1445 pdata = -1; 1446 return (NULL); 1447 } 1448 (void) close(pdata); 1449 pdata = s; 1450 switch (from.su_family) { 1451 case AF_INET: 1452 #ifdef IP_TOS 1453 if (!mapped) { 1454 tos = IPTOS_THROUGHPUT; 1455 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1456 (char *)&tos, sizeof(int)); 1457 } 1458 break; 1459 #endif 1460 } 1461 /* Set keepalives on the socket to detect dropped conns. */ 1462 #ifdef SO_KEEPALIVE 1463 keepalive = 1; 1464 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1465 (char *)&keepalive, sizeof(int)); 1466 #endif 1467 reply(150, "Opening %s mode data connection for '%s'%s.", 1468 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1469 return (fdopen(pdata, mode)); 1470 } 1471 if (data >= 0) { 1472 reply(125, "Using existing data connection for '%s'%s.", 1473 name, sizebuf); 1474 usedefault = 1; 1475 return (fdopen(data, mode)); 1476 } 1477 if (usedefault) 1478 data_dest = his_addr; 1479 usedefault = 1; 1480 file = getdatasock(mode); 1481 if (file == NULL) { 1482 char hbuf[NI_MAXHOST]; 1483 char pbuf[10]; 1484 1485 getnameinfo((struct sockaddr *)&data_source.si_su, 1486 data_source.su_len, hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1487 NI_NUMERICHOST | NI_NUMERICSERV); 1488 reply(425, "Can't create data socket (%s,%s): %s.", 1489 hbuf, pbuf, strerror(errno)); 1490 return (NULL); 1491 } 1492 data = fileno(file); 1493 while (connect(data, (struct sockaddr *)&data_dest.si_su, 1494 data_dest.su_len) < 0) { 1495 if (errno == EADDRINUSE && retry < swaitmax) { 1496 sleep((unsigned) swaitint); 1497 retry += swaitint; 1498 continue; 1499 } 1500 perror_reply(425, "Can't build data connection"); 1501 (void) fclose(file); 1502 data = -1; 1503 return (NULL); 1504 } 1505 reply(150, "Opening %s mode data connection for '%s'%s.", 1506 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1507 return (file); 1508 } 1509 1510 void 1511 closedataconn(FILE *fd) 1512 { 1513 1514 if (fd != NULL) 1515 (void)fclose(fd); 1516 data = -1; 1517 if (pdata >= 0) 1518 (void)close(pdata); 1519 pdata = -1; 1520 } 1521 1522 /* 1523 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1524 * encapsulation of the data subject * to Mode, Structure, and Type. 1525 * 1526 * NB: Form isn't handled. 1527 */ 1528 static int 1529 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1530 { 1531 int c, filefd, netfd, rval; 1532 char *buf; 1533 1534 transflag = 1; 1535 rval = -1; 1536 buf = NULL; 1537 if (setjmp(urgcatch)) 1538 goto cleanup_send_data; 1539 1540 switch (type) { 1541 1542 case TYPE_A: 1543 /* XXXLUKEM: rate limit ascii send (get) */ 1544 (void) alarm(curclass.timeout); 1545 while ((c = getc(instr)) != EOF) { 1546 byte_count++; 1547 if (c == '\n') { 1548 if (ferror(outstr)) 1549 goto data_err; 1550 (void) putc('\r', outstr); 1551 if (isdata) { 1552 total_data_out++; 1553 total_data++; 1554 } 1555 total_bytes_out++; 1556 total_bytes++; 1557 } 1558 (void) putc(c, outstr); 1559 if (isdata) { 1560 total_data_out++; 1561 total_data++; 1562 } 1563 total_bytes_out++; 1564 total_bytes++; 1565 if ((byte_count % 4096) == 0) 1566 (void) alarm(curclass.timeout); 1567 } 1568 (void) alarm(0); 1569 fflush(outstr); 1570 if (ferror(instr)) 1571 goto file_err; 1572 if (ferror(outstr)) 1573 goto data_err; 1574 rval = 0; 1575 goto cleanup_send_data; 1576 1577 case TYPE_I: 1578 case TYPE_L: 1579 if ((buf = malloc((size_t)blksize)) == NULL) { 1580 perror_reply(451, "Local resource failure: malloc"); 1581 goto cleanup_send_data; 1582 } 1583 filefd = fileno(instr); 1584 netfd = fileno(outstr); 1585 (void) alarm(curclass.timeout); 1586 if (curclass.rateget) { 1587 while (1) { 1588 int d; 1589 struct timeval then, now, td; 1590 off_t bufrem; 1591 char *bufp; 1592 1593 (void)gettimeofday(&then, NULL); 1594 errno = c = d = 0; 1595 bufrem = curclass.rateget; 1596 while (bufrem > 0) { 1597 if ((c = read(filefd, buf, 1598 MIN(blksize, bufrem))) <= 0) 1599 goto senddone; 1600 (void) alarm(curclass.timeout); 1601 bufrem -= c; 1602 byte_count += c; 1603 if (isdata) { 1604 total_data_out += c; 1605 total_data += c; 1606 } 1607 total_bytes_out += c; 1608 total_bytes += c; 1609 for (bufp = buf; c > 0; 1610 c -= d, bufp += d) 1611 if ((d = 1612 write(netfd, bufp, c)) <= 0) 1613 break; 1614 if (d < 0) 1615 goto data_err; 1616 } 1617 (void)gettimeofday(&now, NULL); 1618 timersub(&now, &then, &td); 1619 if (td.tv_sec == 0) 1620 usleep(1000000 - td.tv_usec); 1621 } 1622 } else { 1623 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1624 if (write(netfd, buf, c) != c) 1625 goto data_err; 1626 (void) alarm(curclass.timeout); 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 } 1635 } 1636 senddone: 1637 if (c < 0) 1638 goto file_err; 1639 rval = 0; 1640 goto cleanup_send_data; 1641 1642 default: 1643 reply(550, "Unimplemented TYPE %d in send_data", type); 1644 goto cleanup_send_data; 1645 } 1646 1647 data_err: 1648 (void) alarm(0); 1649 perror_reply(426, "Data connection"); 1650 goto cleanup_send_data; 1651 1652 file_err: 1653 (void) alarm(0); 1654 perror_reply(551, "Error on input file"); 1655 /* FALLTHROUGH */ 1656 1657 cleanup_send_data: 1658 (void) alarm(0); 1659 transflag = 0; 1660 if (buf) 1661 free(buf); 1662 if (isdata) { 1663 total_files_out++; 1664 total_files++; 1665 } 1666 total_xfers_out++; 1667 total_xfers++; 1668 return (rval); 1669 } 1670 1671 /* 1672 * Transfer data from peer to "outstr" using the appropriate encapulation of 1673 * the data subject to Mode, Structure, and Type. 1674 * 1675 * N.B.: Form isn't handled. 1676 */ 1677 static int 1678 receive_data(FILE *instr, FILE *outstr) 1679 { 1680 int c, bare_lfs, netfd, filefd, rval; 1681 off_t byteswritten; 1682 char buf[BUFSIZ]; 1683 #ifdef __GNUC__ 1684 (void) &bare_lfs; 1685 #endif 1686 1687 bare_lfs = 0; 1688 transflag = 1; 1689 rval = -1; 1690 byteswritten = 0; 1691 if (setjmp(urgcatch)) 1692 goto cleanup_recv_data; 1693 1694 #define FILESIZECHECK(x) \ 1695 do { \ 1696 if (curclass.maxfilesize != -1 && \ 1697 (x) > curclass.maxfilesize) { \ 1698 errno = EFBIG; \ 1699 goto file_err; \ 1700 } \ 1701 } while (0) 1702 1703 switch (type) { 1704 1705 case TYPE_I: 1706 case TYPE_L: 1707 netfd = fileno(instr); 1708 filefd = fileno(outstr); 1709 (void) alarm(curclass.timeout); 1710 if (curclass.rateput) { 1711 while (1) { 1712 int d; 1713 struct timeval then, now, td; 1714 off_t bufrem; 1715 1716 (void)gettimeofday(&then, NULL); 1717 errno = c = d = 0; 1718 for (bufrem = curclass.rateput; bufrem > 0; ) { 1719 if ((c = read(netfd, buf, 1720 MIN(sizeof(buf), bufrem))) <= 0) 1721 goto recvdone; 1722 FILESIZECHECK(byte_count + c); 1723 if ((d = write(filefd, buf, c)) != c) 1724 goto file_err; 1725 (void) alarm(curclass.timeout); 1726 bufrem -= c; 1727 byte_count += c; 1728 total_data_in += c; 1729 total_data += c; 1730 total_bytes_in += c; 1731 total_bytes += c; 1732 } 1733 (void)gettimeofday(&now, NULL); 1734 timersub(&now, &then, &td); 1735 if (td.tv_sec == 0) 1736 usleep(1000000 - td.tv_usec); 1737 } 1738 } else { 1739 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1740 FILESIZECHECK(byte_count + c); 1741 if (write(filefd, buf, c) != c) 1742 goto file_err; 1743 (void) alarm(curclass.timeout); 1744 byte_count += c; 1745 total_data_in += c; 1746 total_data += c; 1747 total_bytes_in += c; 1748 total_bytes += c; 1749 } 1750 } 1751 recvdone: 1752 if (c < 0) 1753 goto data_err; 1754 rval = 0; 1755 goto cleanup_recv_data; 1756 1757 case TYPE_E: 1758 reply(553, "TYPE E not implemented."); 1759 goto cleanup_recv_data; 1760 1761 case TYPE_A: 1762 (void) alarm(curclass.timeout); 1763 /* XXXLUKEM: rate limit ascii receive (put) */ 1764 while ((c = getc(instr)) != EOF) { 1765 byte_count++; 1766 total_data_in++; 1767 total_data++; 1768 total_bytes_in++; 1769 total_bytes++; 1770 if ((byte_count % 4096) == 0) 1771 (void) alarm(curclass.timeout); 1772 if (c == '\n') 1773 bare_lfs++; 1774 while (c == '\r') { 1775 if (ferror(outstr)) 1776 goto data_err; 1777 if ((c = getc(instr)) != '\n') { 1778 byte_count++; 1779 total_data_in++; 1780 total_data++; 1781 total_bytes_in++; 1782 total_bytes++; 1783 if ((byte_count % 4096) == 0) 1784 (void) alarm(curclass.timeout); 1785 byteswritten++; 1786 FILESIZECHECK(byteswritten); 1787 (void) putc ('\r', outstr); 1788 if (c == '\0' || c == EOF) 1789 goto contin2; 1790 } 1791 } 1792 byteswritten++; 1793 FILESIZECHECK(byteswritten); 1794 (void) putc(c, outstr); 1795 contin2: ; 1796 } 1797 (void) alarm(0); 1798 fflush(outstr); 1799 if (ferror(instr)) 1800 goto data_err; 1801 if (ferror(outstr)) 1802 goto file_err; 1803 if (bare_lfs) { 1804 reply(-226, 1805 "WARNING! %d bare linefeeds received in ASCII mode", 1806 bare_lfs); 1807 reply(0, "File may not have transferred correctly."); 1808 } 1809 rval = 0; 1810 goto cleanup_recv_data; 1811 1812 default: 1813 reply(550, "Unimplemented TYPE %d in receive_data", type); 1814 goto cleanup_recv_data; 1815 } 1816 #undef FILESIZECHECK(x) 1817 1818 data_err: 1819 (void) alarm(0); 1820 perror_reply(426, "Data Connection"); 1821 goto cleanup_recv_data; 1822 1823 file_err: 1824 (void) alarm(0); 1825 perror_reply(452, "Error writing file"); 1826 goto cleanup_recv_data; 1827 1828 cleanup_recv_data: 1829 (void) alarm(0); 1830 transflag = 0; 1831 total_files_in++; 1832 total_files++; 1833 total_xfers_in++; 1834 total_xfers++; 1835 return (rval); 1836 } 1837 1838 void 1839 statcmd(void) 1840 { 1841 struct sockinet *su = NULL; 1842 static char ntop_buf[NI_MAXHOST]; 1843 u_char *a, *p; 1844 int ispassive, af; 1845 off_t otbi, otbo, otb; 1846 1847 a = p = (u_char *)NULL; 1848 1849 reply(-211, "%s FTP server status:", hostname); 1850 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 1851 ntop_buf[0] = '\0'; 1852 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 1853 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1854 && strcmp(remotehost, ntop_buf) != 0) 1855 reply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1856 else 1857 reply(0, "Connected to %s", remotehost); 1858 1859 if (logged_in) { 1860 if (curclass.type == CLASS_GUEST) 1861 reply(0, "Logged in anonymously"); 1862 else 1863 reply(0, "Logged in as %s%s", pw->pw_name, 1864 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1865 } else if (askpasswd) 1866 reply(0, "Waiting for password"); 1867 else 1868 reply(0, "Waiting for user name"); 1869 cprintf(stdout, " TYPE: %s", typenames[type]); 1870 if (type == TYPE_A || type == TYPE_E) 1871 cprintf(stdout, ", FORM: %s", formnames[form]); 1872 if (type == TYPE_L) { 1873 #if NBBY == 8 1874 cprintf(stdout, " %d", NBBY); 1875 #else 1876 /* XXX: `bytesize' needs to be defined in this case */ 1877 cprintf(stdout, " %d", bytesize); 1878 #endif 1879 } 1880 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 1881 strunames[stru], modenames[mode]); 1882 ispassive = 0; 1883 if (data != -1) { 1884 reply(0, "Data connection open"); 1885 su = NULL; 1886 } else if (pdata != -1) { 1887 reply(0, "in Passive mode"); 1888 su = (struct sockinet *)&pasv_addr; 1889 ispassive = 1; 1890 goto printaddr; 1891 } else if (usedefault == 0) { 1892 if (epsvall) { 1893 reply(0, "EPSV only mode (EPSV ALL)"); 1894 goto epsvonly; 1895 } 1896 su = (struct sockinet *)&data_dest; 1897 printaddr: 1898 /* PASV/PORT */ 1899 if (su->su_family == AF_INET) { 1900 a = (u_char *) &su->su_addr; 1901 p = (u_char *) &su->su_port; 1902 #define UC(b) (((int) b) & 0xff) 1903 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 1904 ispassive ? "PASV" : "PORT" , 1905 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1906 UC(p[0]), UC(p[1])); 1907 } 1908 1909 /* LPSV/LPRT */ 1910 { 1911 int alen, af, i; 1912 1913 alen = 0; 1914 switch (su->su_family) { 1915 case AF_INET: 1916 a = (u_char *) &su->su_addr; 1917 p = (u_char *) &su->su_port; 1918 alen = sizeof(su->su_addr); 1919 af = 4; 1920 break; 1921 #ifdef INET6 1922 case AF_INET6: 1923 a = (u_char *) &su->su_6addr; 1924 p = (u_char *) &su->su_port; 1925 alen = sizeof(su->su_6addr); 1926 af = 6; 1927 break; 1928 #endif 1929 default: 1930 af = 0; 1931 break; 1932 } 1933 if (af) { 1934 cprintf(stdout, " %s (%d,%d", 1935 ispassive ? "LPSV" : "LPRT", af, alen); 1936 for (i = 0; i < alen; i++) 1937 cprintf(stdout, ",%d", UC(a[i])); 1938 cprintf(stdout, ",%d,%d,%d)", 2, UC(p[0]), UC(p[1])); 1939 #undef UC 1940 } 1941 } 1942 1943 /* EPRT/EPSV */ 1944 epsvonly: 1945 af = af2epsvproto(su->su_family); 1946 ntop_buf[0] = '\0'; 1947 if (af > 0) { 1948 if (getnameinfo((struct sockaddr *)&su->si_su, 1949 su->su_len, ntop_buf, sizeof(ntop_buf), NULL, 0, 1950 NI_NUMERICHOST) == 0) 1951 reply(0, "%s (|%d|%s|%d|)", 1952 ispassive ? "EPSV" : "EPRT", 1953 af, ntop_buf, ntohs(su->su_port)); 1954 } 1955 } else 1956 reply(0, "No data connection"); 1957 1958 if (logged_in) { 1959 reply(0, 1960 "Data sent: " LLF " byte%s in " LLF " file%s", 1961 (LLT)total_data_out, PLURAL(total_data_out), 1962 (LLT)total_files_out, PLURAL(total_files_out)); 1963 reply(0, 1964 "Data received: " LLF " byte%s in " LLF " file%s", 1965 (LLT)total_data_in, PLURAL(total_data_in), 1966 (LLT)total_files_in, PLURAL(total_files_in)); 1967 reply(0, 1968 "Total data: " LLF " byte%s in " LLF " file%s", 1969 (LLT)total_data, PLURAL(total_data), 1970 (LLT)total_files, PLURAL(total_files)); 1971 } 1972 otbi = total_bytes_in; 1973 otbo = total_bytes_out; 1974 otb = total_bytes; 1975 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 1976 (LLT)otbo, PLURAL(otbo), 1977 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 1978 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 1979 (LLT)otbi, PLURAL(otbi), 1980 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 1981 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 1982 (LLT)otb, PLURAL(otb), 1983 (LLT)total_xfers, PLURAL(total_xfers)); 1984 1985 if (logged_in) { 1986 struct ftpconv *cp; 1987 1988 reply(0, "%s", ""); 1989 reply(0, "Class: %s, type: %s", 1990 curclass.classname, CURCLASSTYPE); 1991 reply(0, "Check PORT/LPRT commands: %sabled", 1992 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 1993 if (! EMPTYSTR(curclass.display)) 1994 reply(0, "Display file: %s", curclass.display); 1995 if (! EMPTYSTR(curclass.notify)) 1996 reply(0, "Notify fileglob: %s", curclass.notify); 1997 reply(0, "Idle timeout: %d, maximum timeout: %d", 1998 curclass.timeout, curclass.maxtimeout); 1999 reply(0, "Current connections: %d", connections); 2000 if (curclass.limit == -1) 2001 reply(0, "Maximum connections: unlimited"); 2002 else 2003 reply(0, "Maximum connections: %d", curclass.limit); 2004 if (curclass.limitfile) 2005 reply(0, "Connection limit exceeded message file: %s", 2006 curclass.limitfile); 2007 if (! EMPTYSTR(curclass.chroot)) 2008 reply(0, "Chroot format: %s", curclass.chroot); 2009 if (! EMPTYSTR(curclass.homedir)) 2010 reply(0, "Homedir format: %s", curclass.homedir); 2011 if (curclass.maxfilesize == -1) 2012 reply(0, "Maximum file size: unlimited"); 2013 else 2014 reply(0, "Maximum file size: " LLF, 2015 (LLT)curclass.maxfilesize); 2016 if (! EMPTYSTR(curclass.motd)) 2017 reply(0, "MotD file: %s", curclass.motd); 2018 reply(0, 2019 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2020 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2021 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2022 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2023 reply(0, "Sanitize file names: %sabled", 2024 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2025 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2026 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2027 if (curclass.portmin && curclass.portmax) 2028 reply(0, "PASV port range: %d - %d", 2029 curclass.portmin, curclass.portmax); 2030 if (curclass.rateget) 2031 reply(0, "Rate get limit: " LLF " bytes/sec", 2032 (LLT)curclass.rateget); 2033 else 2034 reply(0, "Rate get limit: disabled"); 2035 if (curclass.rateput) 2036 reply(0, "Rate put limit: " LLF " bytes/sec", 2037 (LLT)curclass.rateput); 2038 else 2039 reply(0, "Rate put limit: disabled"); 2040 reply(0, "Umask: %.04o", curclass.umask); 2041 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2042 if (cp->suffix == NULL || cp->types == NULL || 2043 cp->command == NULL) 2044 continue; 2045 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2046 cp->suffix, cp->types, cp->disable, cp->command); 2047 } 2048 } 2049 2050 reply(211, "End of status"); 2051 } 2052 2053 void 2054 fatal(const char *s) 2055 { 2056 2057 reply(451, "Error in server: %s\n", s); 2058 reply(221, "Closing connection due to server error."); 2059 dologout(0); 2060 /* NOTREACHED */ 2061 } 2062 2063 /* 2064 * reply() -- 2065 * depending on the value of n, display fmt with a trailing CRLF and 2066 * prefix of: 2067 * n < -1 prefix the message with abs(n) + "-" (initial line) 2068 * n == 0 prefix the message with 4 spaces (middle lines) 2069 * n > 0 prefix the message with n + " " (final line) 2070 */ 2071 void 2072 reply(int n, const char *fmt, ...) 2073 { 2074 off_t b; 2075 va_list ap; 2076 2077 va_start(ap, fmt); 2078 b = 0; 2079 if (n == 0) 2080 cprintf(stdout, " "); 2081 else if (n < 0) 2082 cprintf(stdout, "%d-", -n); 2083 else 2084 cprintf(stdout, "%d ", n); 2085 b = vprintf(fmt, ap); 2086 total_bytes += b; 2087 total_bytes_out += b; 2088 cprintf(stdout, "\r\n"); 2089 (void)fflush(stdout); 2090 if (debug) { 2091 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 2092 vsyslog(LOG_DEBUG, fmt, ap); 2093 } 2094 } 2095 2096 static void 2097 dolog(struct sockaddr *who) 2098 { 2099 2100 (void)getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), 2101 NULL, 0, 0); 2102 2103 #ifdef HASSETPROCTITLE 2104 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2105 setproctitle("%s", proctitle); 2106 #endif /* HASSETPROCTITLE */ 2107 if (logging) 2108 syslog(LOG_INFO, "connection from %s to %s", 2109 remotehost, hostname); 2110 } 2111 2112 /* 2113 * Record logout in wtmp file 2114 * and exit with supplied status. 2115 */ 2116 void 2117 dologout(int status) 2118 { 2119 /* 2120 * Prevent reception of SIGURG from resulting in a resumption 2121 * back to the main program loop. 2122 */ 2123 transflag = 0; 2124 2125 if (logged_in) { 2126 if (dowtmp) 2127 logwtmp(ttyline, "", ""); 2128 if (doutmp) 2129 logout(utmp.ut_line); 2130 #ifdef KERBEROS 2131 if (!notickets && krbtkfile_env) 2132 unlink(krbtkfile_env); 2133 #endif 2134 } 2135 /* beware of flushing buffers after a SIGPIPE */ 2136 _exit(status); 2137 } 2138 2139 static void 2140 myoob(int signo) 2141 { 2142 char *cp; 2143 2144 /* only process if transfer occurring */ 2145 if (!transflag) 2146 return; 2147 cp = tmpline; 2148 if (getline(cp, 7, stdin) == NULL) { 2149 reply(221, "You could at least say goodbye."); 2150 dologout(0); 2151 } 2152 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2153 tmpline[0] = '\0'; 2154 reply(426, "Transfer aborted. Data connection closed."); 2155 reply(226, "Abort successful"); 2156 longjmp(urgcatch, 1); 2157 } 2158 if (strcasecmp(cp, "STAT\r\n") == 0) { 2159 tmpline[0] = '\0'; 2160 if (file_size != (off_t) -1) 2161 reply(213, 2162 "Status: " LLF " of " LLF " byte%s transferred", 2163 (LLT)byte_count, (LLT)file_size, 2164 PLURAL(byte_count)); 2165 else 2166 reply(213, "Status: " LLF " byte%s transferred", 2167 (LLT)byte_count, PLURAL(byte_count)); 2168 } 2169 } 2170 2171 static int 2172 bind_pasv_addr(void) 2173 { 2174 static int passiveport; 2175 int port, len; 2176 2177 len = pasv_addr.su_len; 2178 if (curclass.portmin == 0 && curclass.portmax == 0) { 2179 pasv_addr.su_port = 0; 2180 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2181 } 2182 2183 if (passiveport == 0) { 2184 srand(getpid()); 2185 passiveport = rand() % (curclass.portmax - curclass.portmin) 2186 + curclass.portmin; 2187 } 2188 2189 port = passiveport; 2190 while (1) { 2191 port++; 2192 if (port > curclass.portmax) 2193 port = curclass.portmin; 2194 else if (port == passiveport) { 2195 errno = EAGAIN; 2196 return (-1); 2197 } 2198 pasv_addr.su_port = htons(port); 2199 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 2200 break; 2201 if (errno != EADDRINUSE) 2202 return (-1); 2203 } 2204 passiveport = port; 2205 return (0); 2206 } 2207 2208 /* 2209 * Note: a response of 425 is not mentioned as a possible response to 2210 * the PASV command in RFC959. However, it has been blessed as 2211 * a legitimate response by Jon Postel in a telephone conversation 2212 * with Rick Adams on 25 Jan 89. 2213 */ 2214 void 2215 passive(void) 2216 { 2217 int len; 2218 char *p, *a; 2219 2220 if (pdata >= 0) 2221 close(pdata); 2222 pdata = socket(AF_INET, SOCK_STREAM, 0); 2223 if (pdata < 0 || !logged_in) { 2224 perror_reply(425, "Can't open passive connection"); 2225 return; 2226 } 2227 pasv_addr = ctrl_addr; 2228 2229 if (bind_pasv_addr() < 0) 2230 goto pasv_error; 2231 len = pasv_addr.su_len; 2232 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2233 goto pasv_error; 2234 pasv_addr.su_len = len; 2235 if (listen(pdata, 1) < 0) 2236 goto pasv_error; 2237 a = (char *) &pasv_addr.su_addr; 2238 p = (char *) &pasv_addr.su_port; 2239 2240 #define UC(b) (((int) b) & 0xff) 2241 2242 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2243 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2244 return; 2245 2246 pasv_error: 2247 (void) close(pdata); 2248 pdata = -1; 2249 perror_reply(425, "Can't open passive connection"); 2250 return; 2251 } 2252 2253 /* 2254 * convert protocol identifier to/from AF 2255 */ 2256 int 2257 lpsvproto2af(int proto) 2258 { 2259 2260 switch (proto) { 2261 case 4: 2262 return AF_INET; 2263 #ifdef INET6 2264 case 6: 2265 return AF_INET6; 2266 #endif 2267 default: 2268 return -1; 2269 } 2270 } 2271 2272 int 2273 af2lpsvproto(int af) 2274 { 2275 2276 switch (af) { 2277 case AF_INET: 2278 return 4; 2279 #ifdef INET6 2280 case AF_INET6: 2281 return 6; 2282 #endif 2283 default: 2284 return -1; 2285 } 2286 } 2287 2288 int 2289 epsvproto2af(int proto) 2290 { 2291 2292 switch (proto) { 2293 case 1: 2294 return AF_INET; 2295 #ifdef INET6 2296 case 2: 2297 return AF_INET6; 2298 #endif 2299 default: 2300 return -1; 2301 } 2302 } 2303 2304 int 2305 af2epsvproto(int af) 2306 { 2307 2308 switch (af) { 2309 case AF_INET: 2310 return 1; 2311 #ifdef INET6 2312 case AF_INET6: 2313 return 2; 2314 #endif 2315 default: 2316 return -1; 2317 } 2318 } 2319 2320 /* 2321 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2322 * 229 Entering Extended Passive Mode (|||port|) 2323 */ 2324 void 2325 long_passive(char *cmd, int pf) 2326 { 2327 int len; 2328 char *p, *a; 2329 2330 if (!logged_in) { 2331 syslog(LOG_NOTICE, "long passive but not logged in"); 2332 reply(503, "Login with USER first."); 2333 return; 2334 } 2335 2336 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2337 /* 2338 * XXX: only EPRT/EPSV ready clients will understand this 2339 */ 2340 if (strcmp(cmd, "EPSV") != 0) 2341 reply(501, "Network protocol mismatch"); /*XXX*/ 2342 else 2343 epsv_protounsupp("Network protocol mismatch"); 2344 2345 return; 2346 } 2347 2348 if (pdata >= 0) 2349 close(pdata); 2350 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2351 if (pdata < 0) { 2352 perror_reply(425, "Can't open passive connection"); 2353 return; 2354 } 2355 pasv_addr = ctrl_addr; 2356 if (bind_pasv_addr() < 0) 2357 goto pasv_error; 2358 len = pasv_addr.su_len; 2359 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2360 goto pasv_error; 2361 pasv_addr.su_len = len; 2362 if (listen(pdata, 1) < 0) 2363 goto pasv_error; 2364 p = (char *) &pasv_addr.su_port; 2365 2366 #define UC(b) (((int) b) & 0xff) 2367 2368 if (strcmp(cmd, "LPSV") == 0) { 2369 switch (pasv_addr.su_family) { 2370 case AF_INET: 2371 a = (char *) &pasv_addr.su_addr; 2372 reply(228, 2373 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2374 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2375 2, UC(p[0]), UC(p[1])); 2376 return; 2377 #ifdef INET6 2378 case AF_INET6: 2379 a = (char *) &pasv_addr.su_6addr; 2380 reply(228, 2381 "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)", 2382 6, 16, 2383 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2384 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2385 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2386 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2387 2, UC(p[0]), UC(p[1])); 2388 return; 2389 #endif 2390 } 2391 #undef UC 2392 } else if (strcmp(cmd, "EPSV") == 0) { 2393 switch (pasv_addr.su_family) { 2394 case AF_INET: 2395 #ifdef INET6 2396 case AF_INET6: 2397 #endif 2398 reply(229, "Entering Extended Passive Mode (|||%d|)", 2399 ntohs(pasv_addr.su_port)); 2400 return; 2401 } 2402 } else { 2403 /* more proper error code? */ 2404 } 2405 2406 pasv_error: 2407 (void) close(pdata); 2408 pdata = -1; 2409 perror_reply(425, "Can't open passive connection"); 2410 return; 2411 } 2412 2413 int 2414 extended_port(const char *arg) 2415 { 2416 char *tmp = NULL; 2417 char *result[3]; 2418 char *p, *q; 2419 char delim; 2420 struct addrinfo hints; 2421 struct addrinfo *res = NULL; 2422 int i; 2423 unsigned long proto; 2424 2425 tmp = xstrdup(arg); 2426 p = tmp; 2427 delim = p[0]; 2428 p++; 2429 memset(result, 0, sizeof(result)); 2430 for (i = 0; i < 3; i++) { 2431 q = strchr(p, delim); 2432 if (!q || *q != delim) 2433 goto parsefail; 2434 *q++ = '\0'; 2435 result[i] = p; 2436 p = q; 2437 } 2438 2439 /* some more sanity checks */ 2440 p = NULL; 2441 (void)strtoul(result[2], &p, 10); 2442 if (!*result[2] || *p) 2443 goto parsefail; 2444 p = NULL; 2445 proto = strtoul(result[0], &p, 10); 2446 if (!*result[0] || *p) 2447 goto protounsupp; 2448 2449 memset(&hints, 0, sizeof(hints)); 2450 hints.ai_family = epsvproto2af((int)proto); 2451 if (hints.ai_family < 0) 2452 goto protounsupp; 2453 hints.ai_socktype = SOCK_STREAM; 2454 hints.ai_flags = AI_NUMERICHOST; 2455 if (getaddrinfo(result[1], result[2], &hints, &res)) 2456 goto parsefail; 2457 if (res->ai_next) 2458 goto parsefail; 2459 if (sizeof(data_dest) < res->ai_addrlen) 2460 goto parsefail; 2461 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2462 if (his_addr.su_family == AF_INET6 && 2463 data_dest.su_family == AF_INET6) { 2464 /* XXX: more sanity checks! */ 2465 data_dest.su_scope_id = his_addr.su_scope_id; 2466 } 2467 2468 if (tmp != NULL) 2469 free(tmp); 2470 if (res) 2471 freeaddrinfo(res); 2472 return 0; 2473 2474 parsefail: 2475 reply(500, "Invalid argument, rejected."); 2476 usedefault = 1; 2477 if (tmp != NULL) 2478 free(tmp); 2479 if (res) 2480 freeaddrinfo(res); 2481 return -1; 2482 2483 protounsupp: 2484 epsv_protounsupp("Protocol not supported"); 2485 usedefault = 1; 2486 if (tmp != NULL) 2487 free(tmp); 2488 if (res) 2489 freeaddrinfo(res); 2490 return -1; 2491 } 2492 2493 /* 2494 * 522 Protocol not supported (proto,...) 2495 * as we assume address family for control and data connections are the same, 2496 * we do not return the list of address families we support - instead, we 2497 * return the address family of the control connection. 2498 */ 2499 void 2500 epsv_protounsupp(const char *message) 2501 { 2502 int proto; 2503 2504 proto = af2epsvproto(ctrl_addr.su_family); 2505 if (proto < 0) 2506 reply(501, "%s", message); /* XXX */ 2507 else 2508 reply(522, "%s, use (%d)", message, proto); 2509 } 2510 2511 /* 2512 * Generate unique name for file with basename "local". 2513 * The file named "local" is already known to exist. 2514 * Generates failure reply on error. 2515 * 2516 * XXX: this function should under go changes similar to 2517 * the mktemp(3)/mkstemp(3) changes. 2518 */ 2519 static char * 2520 gunique(const char *local) 2521 { 2522 static char new[MAXPATHLEN]; 2523 struct stat st; 2524 char *cp; 2525 int count; 2526 2527 cp = strrchr(local, '/'); 2528 if (cp) 2529 *cp = '\0'; 2530 if (stat(cp ? local : ".", &st) < 0) { 2531 perror_reply(553, cp ? local : "."); 2532 return (NULL); 2533 } 2534 if (cp) 2535 *cp = '/'; 2536 for (count = 1; count < 100; count++) { 2537 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2538 if (stat(new, &st) < 0) 2539 return (new); 2540 } 2541 reply(452, "Unique file name cannot be created."); 2542 return (NULL); 2543 } 2544 2545 /* 2546 * Format and send reply containing system error number. 2547 */ 2548 void 2549 perror_reply(int code, const char *string) 2550 { 2551 int save_errno; 2552 2553 save_errno = errno; 2554 reply(code, "%s: %s.", string, strerror(errno)); 2555 errno = save_errno; 2556 } 2557 2558 static char *onefile[] = { 2559 "", 2560 0 2561 }; 2562 2563 void 2564 send_file_list(const char *whichf) 2565 { 2566 struct stat st; 2567 DIR *dirp = NULL; 2568 struct dirent *dir; 2569 FILE *dout = NULL; 2570 char **dirlist, *dirname, *p; 2571 int simple = 0; 2572 int freeglob = 0; 2573 glob_t gl; 2574 off_t b; 2575 2576 #ifdef __GNUC__ 2577 (void) &dout; 2578 (void) &dirlist; 2579 (void) &simple; 2580 (void) &freeglob; 2581 #endif 2582 2583 p = NULL; 2584 if (strpbrk(whichf, "~{[*?") != NULL) { 2585 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2586 2587 memset(&gl, 0, sizeof(gl)); 2588 freeglob = 1; 2589 if (glob(whichf, flags, 0, &gl)) { 2590 reply(550, "not found"); 2591 goto out; 2592 } else if (gl.gl_pathc == 0) { 2593 errno = ENOENT; 2594 perror_reply(550, whichf); 2595 goto out; 2596 } 2597 dirlist = gl.gl_pathv; 2598 } else { 2599 p = xstrdup(whichf); 2600 onefile[0] = p; 2601 dirlist = onefile; 2602 simple = 1; 2603 } 2604 /* XXX: } for vi sm */ 2605 2606 if (setjmp(urgcatch)) { 2607 transflag = 0; 2608 goto out; 2609 } 2610 while ((dirname = *dirlist++) != NULL) { 2611 int trailingslash = 0; 2612 2613 if (stat(dirname, &st) < 0) { 2614 /* 2615 * If user typed "ls -l", etc, and the client 2616 * used NLST, do what the user meant. 2617 */ 2618 /* XXX: nuke this support? */ 2619 if (dirname[0] == '-' && *dirlist == NULL && 2620 transflag == 0) { 2621 char *argv[] = { INTERNAL_LS, "", NULL }; 2622 2623 argv[1] = dirname; 2624 retrieve(argv, dirname); 2625 goto out; 2626 } 2627 perror_reply(550, whichf); 2628 goto cleanup_send_file_list; 2629 } 2630 2631 if (S_ISREG(st.st_mode)) { 2632 if (dout == NULL) { 2633 dout = dataconn("file list", (off_t)-1, "w"); 2634 if (dout == NULL) 2635 goto out; 2636 transflag++; 2637 } 2638 b = fprintf(dout, "%s%s\n", dirname, 2639 type == TYPE_A ? "\r" : ""); 2640 total_bytes += b; 2641 total_bytes_out += b; 2642 byte_count += strlen(dirname) + 1; 2643 continue; 2644 } else if (!S_ISDIR(st.st_mode)) 2645 continue; 2646 2647 if (dirname[strlen(dirname) - 1] == '/') 2648 trailingslash++; 2649 2650 if ((dirp = opendir(dirname)) == NULL) 2651 continue; 2652 2653 while ((dir = readdir(dirp)) != NULL) { 2654 char nbuf[MAXPATHLEN]; 2655 2656 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2657 continue; 2658 2659 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2660 trailingslash ? "" : "/", dir->d_name); 2661 2662 /* 2663 * We have to do a stat to ensure it's 2664 * not a directory or special file. 2665 */ 2666 /* XXX: follow RFC959 and filter out non files ? */ 2667 if (simple || (stat(nbuf, &st) == 0 && 2668 S_ISREG(st.st_mode))) { 2669 char *p; 2670 2671 if (dout == NULL) { 2672 dout = dataconn("file list", (off_t)-1, 2673 "w"); 2674 if (dout == NULL) 2675 goto out; 2676 transflag++; 2677 } 2678 p = nbuf; 2679 if (nbuf[0] == '.' && nbuf[1] == '/') 2680 p = &nbuf[2]; 2681 b = fprintf(dout, "%s%s\n", p, 2682 type == TYPE_A ? "\r" : ""); 2683 total_bytes += b; 2684 total_bytes_out += b; 2685 byte_count += strlen(nbuf) + 1; 2686 } 2687 } 2688 (void) closedir(dirp); 2689 } 2690 2691 if (dout == NULL) 2692 reply(550, "No files found."); 2693 else if (ferror(dout) != 0) 2694 perror_reply(550, "Data connection"); 2695 else 2696 reply(226, "Transfer complete."); 2697 2698 cleanup_send_file_list: 2699 transflag = 0; 2700 closedataconn(dout); 2701 out: 2702 total_xfers++; 2703 total_xfers_out++; 2704 if (p) 2705 free(p); 2706 if (freeglob) 2707 globfree(&gl); 2708 } 2709 2710 char * 2711 conffilename(const char *s) 2712 { 2713 static char filename[MAXPATHLEN]; 2714 2715 if (*s == '/') 2716 strlcpy(filename, s, sizeof(filename)); 2717 else 2718 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2719 return (filename); 2720 } 2721 2722 /* 2723 * logcmd -- 2724 * based on the arguments, syslog a message: 2725 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2726 * else if file2 != NULL "<command> <file1> <file2>" 2727 * else "<command> <file1>" 2728 * if elapsed != NULL, append "in xxx.yyy seconds" 2729 * if error != NULL, append ": " + error 2730 */ 2731 void 2732 logcmd(const char *command, off_t bytes, const char *file1, const char *file2, 2733 const struct timeval *elapsed, const char *error) 2734 { 2735 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2736 const char *p; 2737 size_t len; 2738 2739 if (logging <=1) 2740 return; 2741 2742 if ((p = realpath(file1, realfile)) == NULL) 2743 p = file1; 2744 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2745 2746 if (bytes != (off_t)-1) { 2747 len += snprintf(buf + len, sizeof(buf) - len, 2748 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 2749 } else if (file2 != NULL) { 2750 if ((p = realpath(file2, realfile)) == NULL) 2751 p = file2; 2752 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2753 } 2754 2755 if (elapsed != NULL) { 2756 len += snprintf(buf + len, sizeof(buf) - len, 2757 " in %ld.%.03d seconds", elapsed->tv_sec, 2758 (int)(elapsed->tv_usec / 1000)); 2759 } 2760 2761 if (error != NULL) 2762 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2763 2764 syslog(LOG_INFO, "%s", buf); 2765 } 2766 2767 char * 2768 xstrdup(const char *s) 2769 { 2770 char *new = strdup(s); 2771 2772 if (new == NULL) 2773 fatal("Local resource failure: malloc"); 2774 /* NOTREACHED */ 2775 return (new); 2776 } 2777 2778 /* 2779 * As per fprintf(), but increment total_bytes and total_bytes_out, 2780 * by the appropriate amount. 2781 */ 2782 void 2783 cprintf(FILE *fd, const char *fmt, ...) 2784 { 2785 off_t b; 2786 va_list ap; 2787 2788 va_start(ap, fmt); 2789 b = vfprintf(fd, fmt, ap); 2790 total_bytes += b; 2791 total_bytes_out += b; 2792 } 2793
Indexes created Mon Sep 22 13:09:51 GMT 2025