ftpd.c revision 1.110
1 /* $NetBSD: ftpd.c,v 1.110 2000/11/15 04:07:07 itojun 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 1.110 2000/11/15 04:07:07 itojun 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 doutmp; /* update utmp file */ 176 int dowtmp; /* update wtmp file */ 177 int dropprivs; /* if privileges should or have been dropped */ 178 int mapped; /* IPv4 connection on AF_INET6 socket */ 179 off_t file_size; 180 off_t byte_count; 181 static char ttyline[20]; 182 static struct utmp utmp; /* for utmp */ 183 184 static char *anondir = NULL; 185 static char confdir[MAXPATHLEN]; 186 187 #if defined(KERBEROS) || defined(KERBEROS5) 188 int has_ccache = 0; 189 int notickets = 1; 190 char *krbtkfile_env = NULL; 191 char *tty = ttyline; 192 int login_krb5_forwardable_tgt = 0; 193 #endif 194 195 int epsvall = 0; 196 197 /* 198 * Timeout intervals for retrying connections 199 * to hosts that don't accept PORT cmds. This 200 * is a kludge, but given the problems with TCP... 201 */ 202 #define SWAITMAX 90 /* wait at most 90 seconds */ 203 #define SWAITINT 5 /* interval between retries */ 204 205 int swaitmax = SWAITMAX; 206 int swaitint = SWAITINT; 207 208 static int bind_pasv_addr(void); 209 static int checkuser(const char *, const char *, int, int, char **); 210 static int checkaccess(const char *); 211 static void dolog(struct sockaddr *); 212 static void end_login(void); 213 static FILE *getdatasock(const char *); 214 static char *gunique(const char *); 215 static void lostconn(int); 216 static void myoob(int); 217 static int receive_data(FILE *, FILE *); 218 static int send_data(FILE *, FILE *, off_t, int); 219 static struct passwd *sgetpwnam(const char *); 220 221 int main(int, char *[]); 222 223 #if defined(KERBEROS) 224 int klogin(struct passwd *, char *, char *, char *); 225 void kdestroy(void); 226 #endif 227 #if defined(KERBEROS5) 228 int k5login(struct passwd *, char *, char *, char *); 229 void k5destroy(void); 230 #endif 231 232 int 233 main(int argc, char *argv[]) 234 { 235 int addrlen, ch, on = 1, tos, keepalive; 236 #ifdef KERBEROS5 237 krb5_error_code kerror; 238 #endif 239 240 connections = 1; 241 debug = 0; 242 logging = 0; 243 pdata = -1; 244 sflag = 0; 245 doutmp = 0; /* default: don't log to utmp */ 246 dowtmp = 1; /* default: DO log to wtmp */ 247 dropprivs = 0; 248 mapped = 0; 249 usedefault = 1; 250 (void)strcpy(confdir, _DEFAULT_CONFDIR); 251 hostname[0] = '\0'; 252 homedir[0] = '\0'; 253 gidcount = 0; 254 255 version = FTPD_VERSION; 256 while ((ch = getopt(argc, argv, "a:c:C:dh:Hlrst:T:u:UvV:W")) != -1) { 257 switch (ch) { 258 case 'a': 259 anondir = optarg; 260 break; 261 262 case 'c': 263 (void)strlcpy(confdir, optarg, sizeof(confdir)); 264 break; 265 266 case 'C': 267 pw = sgetpwnam(optarg); 268 exit(checkaccess(optarg) ? 0 : 1); 269 /* NOTREACHED */ 270 271 case 'd': 272 case 'v': /* deprecated */ 273 debug = 1; 274 break; 275 276 case 'h': 277 strlcpy(hostname, optarg, sizeof(hostname)); 278 break; 279 280 case 'H': 281 if (gethostname(hostname, sizeof(hostname)) == -1) 282 hostname[0] = '\0'; 283 hostname[sizeof(hostname) - 1] = '\0'; 284 break; 285 286 case 'l': 287 logging++; /* > 1 == extra logging */ 288 break; 289 290 case 'r': 291 dropprivs = 1; 292 break; 293 294 case 's': 295 sflag = 1; 296 break; 297 298 case 't': 299 case 'T': 300 case 'u': 301 warnx("-%c has been deprecated in favour of ftpd.conf", 302 ch); 303 break; 304 305 case 'U': 306 doutmp = 1; 307 break; 308 309 case 'V': 310 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 311 version = NULL; 312 else 313 version = xstrdup(optarg); 314 break; 315 316 case 'W': 317 dowtmp = 0; 318 break; 319 320 default: 321 if (optopt == 'a' || optopt == 'C') 322 exit(1); 323 warnx("unknown flag -%c ignored", optopt); 324 break; 325 } 326 } 327 328 /* 329 * LOG_NDELAY sets up the logging connection immediately, 330 * necessary for anonymous ftp's that chroot and can't do it later. 331 */ 332 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 333 memset((char *)&his_addr, 0, sizeof (his_addr)); 334 addrlen = sizeof(his_addr.si_su); 335 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 336 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 337 exit(1); 338 } 339 his_addr.su_len = addrlen; 340 memset((char *)&ctrl_addr, 0, sizeof (ctrl_addr)); 341 addrlen = sizeof(ctrl_addr.si_su); 342 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 343 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 344 exit(1); 345 } 346 ctrl_addr.su_len = addrlen; 347 #ifdef INET6 348 if (his_addr.su_family == AF_INET6 349 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 350 #if 1 351 /* 352 * IPv4 control connection arrived to AF_INET6 socket. 353 * I hate to do this, but this is the easiest solution. 354 * 355 * The assumption is untrue on SIIT environment. 356 */ 357 struct sockinet tmp_addr; 358 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 359 360 tmp_addr = his_addr; 361 memset(&his_addr, 0, sizeof(his_addr)); 362 his_addr.su_family = AF_INET; 363 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 364 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 365 sizeof(his_addr.su_addr)); 366 his_addr.su_port = tmp_addr.su_port; 367 368 tmp_addr = ctrl_addr; 369 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 370 ctrl_addr.su_family = AF_INET; 371 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 372 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 373 sizeof(ctrl_addr.su_addr)); 374 ctrl_addr.su_port = tmp_addr.su_port; 375 #else 376 while (fgets(line, sizeof(line), fd) != NULL) { 377 if ((cp = strchr(line, '\n')) != NULL) 378 *cp = '\0'; 379 reply(-530, "%s", line); 380 } 381 (void) fflush(stdout); 382 (void) fclose(fd); 383 reply(530, 384 "Connection from IPv4 mapped address is not supported."); 385 exit(0); 386 #endif 387 388 mapped = 1; 389 } else 390 #endif /* INET6 */ 391 mapped = 0; 392 #ifdef IP_TOS 393 if (!mapped && his_addr.su_family == AF_INET) { 394 tos = IPTOS_LOWDELAY; 395 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 396 sizeof(int)) < 0) 397 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 398 } 399 #endif 400 /* if the hostname hasn't been given, attempt to determine it */ 401 if (hostname[0] == '\0') { 402 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 403 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 0) 404 != 0) 405 (void)gethostname(hostname, sizeof(hostname)); 406 hostname[sizeof(hostname) - 1] = '\0'; 407 } 408 409 /* set this here so klogin can use it... */ 410 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 411 412 (void) freopen(_PATH_DEVNULL, "w", stderr); 413 (void) signal(SIGPIPE, lostconn); 414 (void) signal(SIGCHLD, SIG_IGN); 415 if (signal(SIGURG, myoob) == SIG_ERR) 416 syslog(LOG_ERR, "signal: %m"); 417 418 /* Try to handle urgent data inline */ 419 #ifdef SO_OOBINLINE 420 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 421 syslog(LOG_ERR, "setsockopt: %m"); 422 #endif 423 /* Set keepalives on the socket to detect dropped connections. */ 424 #ifdef SO_KEEPALIVE 425 keepalive = 1; 426 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 427 sizeof(int)) < 0) 428 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 429 #endif 430 431 #ifdef F_SETOWN 432 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 433 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 434 #endif 435 dolog((struct sockaddr *)&his_addr); 436 /* 437 * Set up default state 438 */ 439 data = -1; 440 type = TYPE_A; 441 form = FORM_N; 442 stru = STRU_F; 443 mode = MODE_S; 444 tmpline[0] = '\0'; 445 hasyyerrored = 0; 446 447 #ifdef KERBEROS5 448 kerror = krb5_init_context(&kcontext); 449 if (kerror) { 450 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 451 error_message(kerror)); 452 exit(0); 453 } 454 #endif /* KERBEROS5 */ 455 456 init_curclass(); 457 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 458 curclass.type = CLASS_REAL; 459 460 /* If logins are disabled, print out the message. */ 461 if (display_file(_PATH_NOLOGIN, 530)) { 462 reply(530, "System not available."); 463 exit(0); 464 } 465 (void)display_file(conffilename(_PATH_FTPWELCOME), 220); 466 /* reply(220,) must follow */ 467 if (EMPTYSTR(version)) 468 reply(220, "%s FTP server ready.", hostname); 469 else 470 reply(220, "%s FTP server (%s) ready.", hostname, version); 471 472 (void) setjmp(errcatch); 473 for (;;) 474 (void) yyparse(); 475 /* NOTREACHED */ 476 } 477 478 static void 479 lostconn(int signo) 480 { 481 482 if (debug) 483 syslog(LOG_DEBUG, "lost connection"); 484 dologout(1); 485 } 486 487 /* 488 * Save the result of a getpwnam. Used for USER command, since 489 * the data returned must not be clobbered by any other command 490 * (e.g., globbing). 491 */ 492 static struct passwd * 493 sgetpwnam(const char *name) 494 { 495 static struct passwd save; 496 struct passwd *p; 497 498 if ((p = getpwnam(name)) == NULL) 499 return (p); 500 if (save.pw_name) { 501 free((char *)save.pw_name); 502 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 503 free((char *)save.pw_passwd); 504 free((char *)save.pw_gecos); 505 free((char *)save.pw_dir); 506 free((char *)save.pw_shell); 507 } 508 save = *p; 509 save.pw_name = xstrdup(p->pw_name); 510 save.pw_passwd = xstrdup(p->pw_passwd); 511 save.pw_gecos = xstrdup(p->pw_gecos); 512 save.pw_dir = xstrdup(p->pw_dir); 513 save.pw_shell = xstrdup(p->pw_shell); 514 return (&save); 515 } 516 517 static int login_attempts; /* number of failed login attempts */ 518 static int askpasswd; /* had user command, ask for passwd */ 519 static char curname[10]; /* current USER name */ 520 521 /* 522 * USER command. 523 * Sets global passwd pointer pw if named account exists and is acceptable; 524 * sets askpasswd if a PASS command is expected. If logged in previously, 525 * need to reset state. If name is "ftp" or "anonymous", the name is not in 526 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 527 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 528 * requesting login privileges. Disallow anyone who does not have a standard 529 * shell as returned by getusershell(). Disallow anyone mentioned in the file 530 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 531 */ 532 void 533 user(const char *name) 534 { 535 if (logged_in) { 536 switch (curclass.type) { 537 case CLASS_GUEST: 538 reply(530, "Can't change user from guest login."); 539 return; 540 case CLASS_CHROOT: 541 reply(530, "Can't change user from chroot user."); 542 return; 543 case CLASS_REAL: 544 if (dropprivs) { 545 reply(530, "Can't change user."); 546 return; 547 } 548 end_login(); 549 break; 550 default: 551 abort(); 552 } 553 } 554 555 #if defined(KERBEROS) 556 kdestroy(); 557 #endif 558 #if defined(KERBEROS5) 559 k5destroy(); 560 #endif 561 562 curclass.type = CLASS_REAL; 563 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 564 /* need `pw' setup for checkaccess() and checkuser () */ 565 if ((pw = sgetpwnam("ftp")) == NULL) 566 reply(530, "User %s unknown.", name); 567 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 568 reply(530, "User %s access denied.", name); 569 else { 570 curclass.type = CLASS_GUEST; 571 askpasswd = 1; 572 reply(331, 573 "Guest login ok, type your name as password."); 574 } 575 if (!askpasswd && logging) 576 syslog(LOG_NOTICE, 577 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 578 return; 579 } 580 581 pw = sgetpwnam(name); 582 if (logging) 583 strlcpy(curname, name, sizeof(curname)); 584 585 #ifdef SKEY 586 if (skey_haskey(name) == 0) { 587 const char *myskey; 588 589 myskey = skey_keyinfo(name); 590 reply(331, "Password [%s] required for %s.", 591 myskey ? myskey : "error getting challenge", name); 592 } else 593 #endif 594 reply(331, "Password required for %s.", name); 595 596 askpasswd = 1; 597 /* 598 * Delay before reading passwd after first failed 599 * attempt to slow down passwd-guessing programs. 600 */ 601 if (login_attempts) 602 sleep((unsigned) login_attempts); 603 } 604 605 /* 606 * Determine whether something is to happen (allow access, chroot) 607 * for a user. Each line is a shell-style glob followed by 608 * `yes' or `no'. 609 * 610 * For backward compatability, `allow' and `deny' are synonymns 611 * for `yes' and `no', respectively. 612 * 613 * Each glob is matched against the username in turn, and the first 614 * match found is used. If no match is found, the result is the 615 * argument `def'. If a match is found but without and explicit 616 * `yes'/`no', the result is the opposite of def. 617 * 618 * If the file doesn't exist at all, the result is the argument 619 * `nofile' 620 * 621 * Any line starting with `#' is considered a comment and ignored. 622 * 623 * Returns 0 if the user is denied, or 1 if they are allowed. 624 * 625 * NOTE: needs struct passwd *pw setup before use. 626 */ 627 int 628 checkuser(const char *fname, const char *name, int def, int nofile, 629 char **retclass) 630 { 631 FILE *fd; 632 int retval; 633 char *glob, *perm, *class, *buf, *p; 634 size_t len, line; 635 636 retval = def; 637 if (retclass != NULL) 638 *retclass = NULL; 639 if ((fd = fopen(conffilename(fname), "r")) == NULL) 640 return nofile; 641 642 line = 0; 643 for (; 644 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 645 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 646 free(buf), buf = NULL) { 647 glob = perm = class = NULL; 648 p = buf; 649 if (len < 1) 650 continue; 651 if (p[len - 1] == '\n') 652 p[--len] = '\0'; 653 if (EMPTYSTR(p)) 654 continue; 655 656 NEXTWORD(p, glob); 657 NEXTWORD(p, perm); 658 NEXTWORD(p, class); 659 if (EMPTYSTR(glob)) 660 continue; 661 if (!EMPTYSTR(class)) { 662 if (strcasecmp(class, "all") == 0 || 663 strcasecmp(class, "none") == 0) { 664 syslog(LOG_WARNING, 665 "%s line %d: illegal user-defined class `%s' - skipping entry", 666 fname, (int)line, class); 667 continue; 668 } 669 } 670 671 /* have a host specifier */ 672 if ((p = strchr(glob, '@')) != NULL) { 673 unsigned long net, mask, addr; 674 int bits; 675 676 *p++ = '\0'; 677 /* check against network or CIDR */ 678 if (isdigit(*p) && 679 (bits = inet_net_pton(AF_INET, p, 680 &net, sizeof(net))) != -1) { 681 net = ntohl(net); 682 mask = 0xffffffffU << (32 - bits); 683 addr = ntohl(his_addr.su_addr.s_addr); 684 if ((addr & mask) != net) 685 continue; 686 687 /* check against hostname glob */ 688 } else if (fnmatch(p, remotehost, 0) != 0) 689 continue; 690 } 691 692 /* have a group specifier */ 693 if ((p = strchr(glob, ':')) != NULL) { 694 gid_t *groups, *ng; 695 int gsize, i, found; 696 697 *p++ = '\0'; 698 groups = NULL; 699 gsize = 16; 700 do { 701 ng = realloc(groups, gsize * sizeof(gid_t)); 702 if (ng == NULL) 703 fatal( 704 "Local resource failure: realloc"); 705 groups = ng; 706 } while (getgrouplist(pw->pw_name, pw->pw_gid, 707 groups, &gsize) == -1); 708 found = 0; 709 for (i = 0; i < gsize; i++) { 710 struct group *g; 711 712 if ((g = getgrgid(groups[i])) == NULL) 713 continue; 714 if (fnmatch(p, g->gr_name, 0) == 0) { 715 found = 1; 716 break; 717 } 718 } 719 free(groups); 720 if (!found) 721 continue; 722 } 723 724 /* check against username glob */ 725 if (fnmatch(glob, name, 0) != 0) 726 continue; 727 728 if (perm != NULL && 729 ((strcasecmp(perm, "allow") == 0) || 730 (strcasecmp(perm, "yes") == 0))) 731 retval = 1; 732 else if (perm != NULL && 733 ((strcasecmp(perm, "deny") == 0) || 734 (strcasecmp(perm, "no") == 0))) 735 retval = 0; 736 else 737 retval = !def; 738 if (!EMPTYSTR(class) && retclass != NULL) 739 *retclass = xstrdup(class); 740 free(buf); 741 break; 742 } 743 (void) fclose(fd); 744 return (retval); 745 } 746 747 /* 748 * Check if user is allowed by /etc/ftpusers 749 * returns 1 for yes, 0 for no 750 * 751 * NOTE: needs struct passwd *pw setup (for checkuser()) 752 */ 753 int 754 checkaccess(const char *name) 755 { 756 757 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 758 } 759 760 /* 761 * Terminate login as previous user, if any, resetting state; 762 * used when USER command is given or login fails. 763 */ 764 static void 765 end_login(void) 766 { 767 768 if (logged_in) { 769 if (dowtmp) 770 logwtmp(ttyline, "", ""); 771 if (doutmp) 772 logout(utmp.ut_line); 773 } 774 /* reset login state */ 775 (void) seteuid((uid_t)0); 776 pw = NULL; 777 logged_in = 0; 778 quietmessages = 0; 779 gidcount = 0; 780 curclass.type = CLASS_REAL; 781 } 782 783 void 784 pass(const char *passwd) 785 { 786 int rval; 787 const char *cp, *shell; 788 char *class, root[MAXPATHLEN]; 789 790 class = NULL; 791 if (logged_in || askpasswd == 0) { 792 reply(503, "Login with USER first."); 793 return; 794 } 795 askpasswd = 0; 796 if (curclass.type != CLASS_GUEST) { 797 /* "ftp" is the only account allowed with no password */ 798 if (pw == NULL) { 799 rval = 1; /* failure below */ 800 goto skip; 801 } 802 #if defined(KERBEROS) 803 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 804 rval = 0; 805 goto skip; 806 } 807 #endif 808 #if defined(KERBEROS5) 809 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 810 rval = 0; 811 goto skip; 812 } 813 #endif 814 #ifdef SKEY 815 if (skey_haskey(pw->pw_name) == 0) { 816 char *p; 817 int r; 818 819 p = xstrdup(passwd); 820 r = skey_passcheck(pw->pw_name, p); 821 free(p); 822 if (r != -1) { 823 rval = 0; 824 goto skip; 825 } 826 } 827 #endif 828 if (!sflag && *pw->pw_passwd != '\0' && 829 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 830 rval = 0; 831 goto skip; 832 } 833 rval = 1; 834 835 skip: 836 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 837 rval = 2; 838 839 /* 840 * If rval > 0, the user failed the authentication check 841 * above. If rval == 0, either Kerberos or local 842 * authentication succeeded. 843 */ 844 if (rval) { 845 reply(530, "%s", rval == 2 ? "Password expired." : 846 "Login incorrect."); 847 if (logging) { 848 syslog(LOG_NOTICE, 849 "FTP LOGIN FAILED FROM %s", remotehost); 850 syslog(LOG_AUTHPRIV | LOG_NOTICE, 851 "FTP LOGIN FAILED FROM %s, %s", 852 remotehost, curname); 853 } 854 pw = NULL; 855 if (login_attempts++ >= 5) { 856 syslog(LOG_NOTICE, 857 "repeated login failures from %s", 858 remotehost); 859 exit(0); 860 } 861 return; 862 } 863 } 864 865 /* password ok; see if anything else prevents login */ 866 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 867 reply(530, "User %s may not use FTP.", pw->pw_name); 868 if (logging) 869 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 870 remotehost, pw->pw_name); 871 goto bad; 872 } 873 /* if not guest user, check for valid shell */ 874 if ((shell = pw->pw_shell) == NULL || *shell == 0) 875 shell = _PATH_BSHELL; 876 while ((cp = getusershell()) != NULL) 877 if (strcmp(cp, shell) == 0) 878 break; 879 endusershell(); 880 if (cp == NULL && curclass.type != CLASS_GUEST) { 881 reply(530, "User %s may not use FTP.", pw->pw_name); 882 if (logging) 883 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 884 remotehost, pw->pw_name); 885 goto bad; 886 } 887 888 login_attempts = 0; /* this time successful */ 889 if (setegid((gid_t)pw->pw_gid) < 0) { 890 reply(550, "Can't set gid."); 891 goto bad; 892 } 893 (void) initgroups(pw->pw_name, pw->pw_gid); 894 /* cache groups for cmds.c::matchgroup() */ 895 gidcount = getgroups(sizeof(gidlist), gidlist); 896 897 /* open wtmp before chroot */ 898 if (dowtmp) 899 logwtmp(ttyline, pw->pw_name, remotehost); 900 901 /* open utmp before chroot */ 902 if (doutmp) { 903 memset((void *)&utmp, 0, sizeof(utmp)); 904 (void)time(&utmp.ut_time); 905 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 906 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 907 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 908 login(&utmp); 909 } 910 911 logged_in = 1; 912 913 /* check user in /etc/ftpchroot */ 914 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 915 if (curclass.type == CLASS_GUEST) { 916 syslog(LOG_NOTICE, 917 "Can't change guest user to chroot class; remove entry in %s", 918 _PATH_FTPCHROOT); 919 exit(1); 920 } 921 curclass.type = CLASS_CHROOT; 922 } 923 if (class == NULL) { 924 switch (curclass.type) { 925 case CLASS_GUEST: 926 class = xstrdup("guest"); 927 break; 928 case CLASS_CHROOT: 929 class = xstrdup("chroot"); 930 break; 931 case CLASS_REAL: 932 class = xstrdup("real"); 933 break; 934 default: 935 abort(); 936 } 937 } 938 939 /* parse ftpd.conf, setting up various parameters */ 940 parse_conf(class); 941 count_users(); 942 if (curclass.limit != -1 && connections > curclass.limit) { 943 if (! EMPTYSTR(curclass.limitfile)) 944 (void)display_file(conffilename(curclass.limitfile), 945 530); 946 reply(530, 947 "User %s access denied, connection limit of %d reached.", 948 pw->pw_name, curclass.limit); 949 syslog(LOG_NOTICE, 950 "Maximum connection limit of %d for class %s reached, login refused for %s", 951 curclass.limit, curclass.classname, pw->pw_name); 952 goto bad; 953 } 954 955 homedir[0] = '/'; 956 switch (curclass.type) { 957 case CLASS_GUEST: 958 /* 959 * We MUST do a chdir() after the chroot. Otherwise 960 * the old current directory will be accessible as "." 961 * outside the new root! 962 */ 963 format_path(root, 964 curclass.chroot ? curclass.chroot : 965 anondir ? anondir : 966 pw->pw_dir); 967 format_path(homedir, 968 curclass.homedir ? curclass.homedir : 969 "/"); 970 if (EMPTYSTR(homedir)) 971 homedir[0] = '/'; 972 if (EMPTYSTR(root) || chroot(root) < 0) { 973 syslog(LOG_NOTICE, 974 "GUEST user %s: can't chroot to %s: %m", 975 pw->pw_name, root); 976 goto bad_guest; 977 } 978 if (chdir(homedir) < 0) { 979 syslog(LOG_NOTICE, 980 "GUEST user %s: can't chdir to %s: %m", 981 pw->pw_name, homedir); 982 bad_guest: 983 reply(550, "Can't set guest privileges."); 984 goto bad; 985 } 986 break; 987 case CLASS_CHROOT: 988 format_path(root, 989 curclass.chroot ? curclass.chroot : 990 pw->pw_dir); 991 format_path(homedir, 992 curclass.homedir ? curclass.homedir : 993 "/"); 994 if (EMPTYSTR(homedir)) 995 homedir[0] = '/'; 996 if (EMPTYSTR(root) || chroot(root) < 0) { 997 syslog(LOG_NOTICE, 998 "CHROOT user %s: can't chroot to %s: %m", 999 pw->pw_name, root); 1000 goto bad_chroot; 1001 } 1002 if (chdir(homedir) < 0) { 1003 syslog(LOG_NOTICE, 1004 "CHROOT user %s: can't chdir to %s: %m", 1005 pw->pw_name, homedir); 1006 bad_chroot: 1007 reply(550, "Can't change root."); 1008 goto bad; 1009 } 1010 break; 1011 case CLASS_REAL: 1012 format_path(homedir, 1013 curclass.homedir ? curclass.homedir : 1014 pw->pw_dir); 1015 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1016 if (chdir("/") < 0) { 1017 syslog(LOG_NOTICE, 1018 "REAL user %s: can't chdir to %s: %m", 1019 pw->pw_name, 1020 !EMPTYSTR(homedir) ? homedir : "/"); 1021 reply(530, 1022 "User %s: can't change directory to %s.", 1023 pw->pw_name, 1024 !EMPTYSTR(homedir) ? homedir : "/"); 1025 goto bad; 1026 } else { 1027 reply(-230, 1028 "No directory! Logging in with home=/"); 1029 homedir[0] = '/'; 1030 } 1031 } 1032 break; 1033 } 1034 setlogin(pw->pw_name); 1035 if (dropprivs || 1036 (curclass.type != CLASS_REAL && 1037 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1038 dropprivs++; 1039 if (setgid((gid_t)pw->pw_gid) < 0) { 1040 reply(550, "Can't set gid."); 1041 goto bad; 1042 } 1043 if (setuid((uid_t)pw->pw_uid) < 0) { 1044 reply(550, "Can't set uid."); 1045 goto bad; 1046 } 1047 } else { 1048 if (seteuid((uid_t)pw->pw_uid) < 0) { 1049 reply(550, "Can't set uid."); 1050 goto bad; 1051 } 1052 } 1053 setenv("HOME", homedir, 1); 1054 1055 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1056 quietmessages = 1; 1057 1058 /* 1059 * Display a login message, if it exists. 1060 * N.B. reply(230,) must follow the message. 1061 */ 1062 (void)display_file(conffilename(curclass.motd), 230); 1063 show_chdir_messages(230); 1064 if (curclass.type == CLASS_GUEST) { 1065 reply(230, "Guest login ok, access restrictions apply."); 1066 #ifdef HASSETPROCTITLE 1067 snprintf(proctitle, sizeof(proctitle), 1068 "%s: anonymous/%.*s", remotehost, 1069 (int) (sizeof(proctitle) - sizeof(remotehost) - 1070 sizeof(": anonymous/")), passwd); 1071 setproctitle("%s", proctitle); 1072 #endif /* HASSETPROCTITLE */ 1073 if (logging) 1074 syslog(LOG_INFO, 1075 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1076 remotehost, passwd, 1077 curclass.classname, CURCLASSTYPE); 1078 } else { 1079 reply(230, "User %s logged in.", pw->pw_name); 1080 #ifdef HASSETPROCTITLE 1081 snprintf(proctitle, sizeof(proctitle), 1082 "%s: %s", remotehost, pw->pw_name); 1083 setproctitle("%s", proctitle); 1084 #endif /* HASSETPROCTITLE */ 1085 if (logging) 1086 syslog(LOG_INFO, 1087 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1088 remotehost, pw->pw_name, 1089 curclass.classname, CURCLASSTYPE); 1090 } 1091 (void) umask(curclass.umask); 1092 goto cleanuppass; 1093 bad: 1094 /* Forget all about it... */ 1095 end_login(); 1096 cleanuppass: 1097 if (class) 1098 free(class); 1099 } 1100 1101 void 1102 retrieve(char *argv[], const char *name) 1103 { 1104 FILE *fin, *dout; 1105 struct stat st; 1106 int (*closefunc)(FILE *) = NULL; 1107 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1108 struct timeval start, finish, td, *tdp; 1109 const char *dispname; 1110 1111 sendrv = closerv = stderrfd = -1; 1112 isconversion = isdata = isls = log = 0; 1113 tdp = NULL; 1114 dispname = name; 1115 fin = dout = NULL; 1116 if (argv == NULL) { 1117 log = 1; 1118 isdata = 1; 1119 fin = fopen(name, "r"); 1120 closefunc = fclose; 1121 if (fin == NULL) 1122 argv = do_conversion(name); 1123 if (argv != NULL) { 1124 isconversion++; 1125 syslog(LOG_INFO, "get command: '%s' on '%s'", 1126 argv[0], name); 1127 } 1128 } 1129 if (argv != NULL) { 1130 char temp[MAXPATHLEN]; 1131 1132 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1133 isls = 1; 1134 stderrfd = -1; 1135 } else { 1136 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1137 stderrfd = mkstemp(temp); 1138 if (stderrfd != -1) 1139 (void)unlink(temp); 1140 } 1141 dispname = argv[0]; 1142 fin = ftpd_popen(argv, "r", stderrfd); 1143 closefunc = ftpd_pclose; 1144 st.st_size = -1; 1145 st.st_blksize = BUFSIZ; 1146 } 1147 if (fin == NULL) { 1148 if (errno != 0) { 1149 perror_reply(550, dispname); 1150 if (log) 1151 logcmd("get", -1, name, NULL, NULL, 1152 strerror(errno)); 1153 } 1154 goto cleanupretrieve; 1155 } 1156 byte_count = -1; 1157 if (argv == NULL 1158 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1159 reply(550, "%s: not a plain file.", dispname); 1160 goto done; 1161 } 1162 if (restart_point) { 1163 if (type == TYPE_A) { 1164 off_t i; 1165 int c; 1166 1167 for (i = 0; i < restart_point; i++) { 1168 if ((c=getc(fin)) == EOF) { 1169 perror_reply(550, dispname); 1170 goto done; 1171 } 1172 if (c == '\n') 1173 i++; 1174 } 1175 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1176 perror_reply(550, dispname); 1177 goto done; 1178 } 1179 } 1180 dout = dataconn(dispname, st.st_size, "w"); 1181 if (dout == NULL) 1182 goto done; 1183 1184 (void)gettimeofday(&start, NULL); 1185 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1186 (void)gettimeofday(&finish, NULL); 1187 (void) fclose(dout); /* close now to affect timing stats */ 1188 dout = NULL; 1189 timersub(&finish, &start, &td); 1190 tdp = &td; 1191 done: 1192 if (log) 1193 logcmd("get", byte_count, name, NULL, tdp, NULL); 1194 closerv = (*closefunc)(fin); 1195 if (sendrv == 0) { 1196 FILE *err; 1197 struct stat sb; 1198 1199 if (!isls && argv != NULL && closerv != 0) { 1200 reply(-226, 1201 "Command returned an exit status of %d", 1202 closerv); 1203 if (isconversion) 1204 syslog(LOG_INFO, 1205 "retrieve command: '%s' returned %d", 1206 argv[0], closerv); 1207 } 1208 if (!isls && argv != NULL && stderrfd != -1 && 1209 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1210 ((err = fdopen(stderrfd, "r")) != NULL)) { 1211 char *cp, line[LINE_MAX]; 1212 1213 reply(-226, "Command error messages:"); 1214 rewind(err); 1215 while (fgets(line, sizeof(line), err) != NULL) { 1216 if ((cp = strchr(line, '\n')) != NULL) 1217 *cp = '\0'; 1218 reply(0, " %s", line); 1219 } 1220 (void) fflush(stdout); 1221 (void) fclose(err); 1222 /* a reply(226,) must follow */ 1223 } 1224 reply(226, "Transfer complete."); 1225 } 1226 cleanupretrieve: 1227 closedataconn(dout); 1228 if (stderrfd != -1) 1229 (void)close(stderrfd); 1230 if (isconversion) 1231 free(argv); 1232 } 1233 1234 void 1235 store(const char *name, const char *mode, int unique) 1236 { 1237 FILE *fout, *din; 1238 struct stat st; 1239 int (*closefunc)(FILE *); 1240 struct timeval start, finish, td, *tdp; 1241 char *desc; 1242 1243 din = NULL; 1244 desc = (*mode == 'w') ? "put" : "append"; 1245 if (unique && stat(name, &st) == 0 && 1246 (name = gunique(name)) == NULL) { 1247 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1248 goto cleanupstore; 1249 } 1250 1251 if (restart_point) 1252 mode = "r+"; 1253 fout = fopen(name, mode); 1254 closefunc = fclose; 1255 tdp = NULL; 1256 if (fout == NULL) { 1257 perror_reply(553, name); 1258 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1259 goto cleanupstore; 1260 } 1261 byte_count = -1; 1262 if (restart_point) { 1263 if (type == TYPE_A) { 1264 off_t i; 1265 int c; 1266 1267 for (i = 0; i < restart_point; i++) { 1268 if ((c=getc(fout)) == EOF) { 1269 perror_reply(550, name); 1270 goto done; 1271 } 1272 if (c == '\n') 1273 i++; 1274 } 1275 /* 1276 * We must do this seek to "current" position 1277 * because we are changing from reading to 1278 * writing. 1279 */ 1280 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1281 perror_reply(550, name); 1282 goto done; 1283 } 1284 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1285 perror_reply(550, name); 1286 goto done; 1287 } 1288 } 1289 din = dataconn(name, (off_t)-1, "r"); 1290 if (din == NULL) 1291 goto done; 1292 (void)gettimeofday(&start, NULL); 1293 if (receive_data(din, fout) == 0) { 1294 if (unique) 1295 reply(226, "Transfer complete (unique file name:%s).", 1296 name); 1297 else 1298 reply(226, "Transfer complete."); 1299 } 1300 (void)gettimeofday(&finish, NULL); 1301 (void) fclose(din); /* close now to affect timing stats */ 1302 din = NULL; 1303 timersub(&finish, &start, &td); 1304 tdp = &td; 1305 done: 1306 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1307 (*closefunc)(fout); 1308 cleanupstore: 1309 closedataconn(din); 1310 } 1311 1312 static FILE * 1313 getdatasock(const char *mode) 1314 { 1315 int on, s, t, tries; 1316 in_port_t port; 1317 1318 on = 1; 1319 if (data >= 0) 1320 return (fdopen(data, mode)); 1321 if (! dropprivs) 1322 (void) seteuid((uid_t)0); 1323 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1324 if (s < 0) 1325 goto bad; 1326 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1327 (char *) &on, sizeof(on)) < 0) 1328 goto bad; 1329 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1330 (char *) &on, sizeof(on)) < 0) 1331 goto bad; 1332 /* anchor socket to avoid multi-homing problems */ 1333 data_source = ctrl_addr; 1334 /* 1335 * By default source port for PORT connctions is 1336 * ctrlport-1 (see RFC959 section 5.2). 1337 * However, if privs have been dropped and that 1338 * would be < IPPORT_RESERVED, use a random port 1339 * instead. 1340 */ 1341 port = ntohs(ctrl_addr.su_port) - 1; 1342 if (dropprivs && port < IPPORT_RESERVED) 1343 port = 0; /* use random port */ 1344 data_source.su_port = htons(port); 1345 1346 for (tries = 1; ; tries++) { 1347 if (bind(s, (struct sockaddr *)&data_source.si_su, 1348 data_source.su_len) >= 0) 1349 break; 1350 if (errno != EADDRINUSE || tries > 10) 1351 goto bad; 1352 sleep(tries); 1353 } 1354 if (! dropprivs) 1355 (void) seteuid((uid_t)pw->pw_uid); 1356 #ifdef IP_TOS 1357 if (!mapped && ctrl_addr.su_family == AF_INET) { 1358 on = IPTOS_THROUGHPUT; 1359 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1360 sizeof(int)) < 0) 1361 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1362 } 1363 #endif 1364 return (fdopen(s, mode)); 1365 bad: 1366 /* Return the real value of errno (close may change it) */ 1367 t = errno; 1368 if (! dropprivs) 1369 (void) seteuid((uid_t)pw->pw_uid); 1370 (void) close(s); 1371 errno = t; 1372 return (NULL); 1373 } 1374 1375 FILE * 1376 dataconn(const char *name, off_t size, const char *mode) 1377 { 1378 char sizebuf[32]; 1379 FILE *file; 1380 int retry = 0, tos, keepalive; 1381 1382 file_size = size; 1383 byte_count = 0; 1384 if (size != (off_t) -1) 1385 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1386 (LLT)size, PLURAL(size)); 1387 else 1388 sizebuf[0] = '\0'; 1389 if (pdata >= 0) { 1390 struct sockinet from; 1391 int s, fromlen = sizeof(from.su_len); 1392 1393 (void) alarm(curclass.timeout); 1394 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 1395 (void) alarm(0); 1396 if (s < 0) { 1397 reply(425, "Can't open data connection."); 1398 (void) close(pdata); 1399 pdata = -1; 1400 return (NULL); 1401 } 1402 (void) close(pdata); 1403 pdata = s; 1404 switch (from.su_family) { 1405 case AF_INET: 1406 #ifdef IP_TOS 1407 if (!mapped) { 1408 tos = IPTOS_THROUGHPUT; 1409 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1410 (char *)&tos, sizeof(int)); 1411 } 1412 break; 1413 #endif 1414 } 1415 /* Set keepalives on the socket to detect dropped conns. */ 1416 #ifdef SO_KEEPALIVE 1417 keepalive = 1; 1418 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1419 (char *)&keepalive, sizeof(int)); 1420 #endif 1421 reply(150, "Opening %s mode data connection for '%s'%s.", 1422 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1423 return (fdopen(pdata, mode)); 1424 } 1425 if (data >= 0) { 1426 reply(125, "Using existing data connection for '%s'%s.", 1427 name, sizebuf); 1428 usedefault = 1; 1429 return (fdopen(data, mode)); 1430 } 1431 if (usedefault) 1432 data_dest = his_addr; 1433 usedefault = 1; 1434 file = getdatasock(mode); 1435 if (file == NULL) { 1436 char hbuf[NI_MAXHOST]; 1437 char pbuf[10]; 1438 1439 getnameinfo((struct sockaddr *)&data_source.si_su, 1440 data_source.su_len, hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1441 NI_NUMERICHOST | NI_NUMERICSERV); 1442 reply(425, "Can't create data socket (%s,%s): %s.", 1443 hbuf, pbuf, strerror(errno)); 1444 return (NULL); 1445 } 1446 data = fileno(file); 1447 while (connect(data, (struct sockaddr *)&data_dest.si_su, 1448 data_dest.su_len) < 0) { 1449 if (errno == EADDRINUSE && retry < swaitmax) { 1450 sleep((unsigned) swaitint); 1451 retry += swaitint; 1452 continue; 1453 } 1454 perror_reply(425, "Can't build data connection"); 1455 (void) fclose(file); 1456 data = -1; 1457 return (NULL); 1458 } 1459 reply(150, "Opening %s mode data connection for '%s'%s.", 1460 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1461 return (file); 1462 } 1463 1464 void 1465 closedataconn(FILE *fd) 1466 { 1467 1468 if (fd != NULL) 1469 (void)fclose(fd); 1470 data = -1; 1471 if (pdata >= 0) 1472 (void)close(pdata); 1473 pdata = -1; 1474 } 1475 1476 /* 1477 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1478 * encapsulation of the data subject * to Mode, Structure, and Type. 1479 * 1480 * NB: Form isn't handled. 1481 */ 1482 static int 1483 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1484 { 1485 int c, filefd, netfd, rval; 1486 char *buf; 1487 1488 transflag = 1; 1489 rval = -1; 1490 buf = NULL; 1491 if (setjmp(urgcatch)) 1492 goto cleanup_send_data; 1493 1494 switch (type) { 1495 1496 case TYPE_A: 1497 /* XXXLUKEM: rate limit ascii send (get) */ 1498 (void) alarm(curclass.timeout); 1499 while ((c = getc(instr)) != EOF) { 1500 byte_count++; 1501 if (c == '\n') { 1502 if (ferror(outstr)) 1503 goto data_err; 1504 (void) putc('\r', outstr); 1505 if (isdata) { 1506 total_data_out++; 1507 total_data++; 1508 } 1509 total_bytes_out++; 1510 total_bytes++; 1511 } 1512 (void) putc(c, outstr); 1513 if (isdata) { 1514 total_data_out++; 1515 total_data++; 1516 } 1517 total_bytes_out++; 1518 total_bytes++; 1519 if ((byte_count % 4096) == 0) 1520 (void) alarm(curclass.timeout); 1521 } 1522 (void) alarm(0); 1523 fflush(outstr); 1524 if (ferror(instr)) 1525 goto file_err; 1526 if (ferror(outstr)) 1527 goto data_err; 1528 rval = 0; 1529 goto cleanup_send_data; 1530 1531 case TYPE_I: 1532 case TYPE_L: 1533 if ((buf = malloc((size_t)blksize)) == NULL) { 1534 perror_reply(451, "Local resource failure: malloc"); 1535 goto cleanup_send_data; 1536 } 1537 filefd = fileno(instr); 1538 netfd = fileno(outstr); 1539 (void) alarm(curclass.timeout); 1540 if (curclass.rateget) { 1541 while (1) { 1542 int d; 1543 struct timeval then, now, td; 1544 off_t bufrem; 1545 char *bufp; 1546 1547 (void)gettimeofday(&then, NULL); 1548 errno = c = d = 0; 1549 bufrem = curclass.rateget; 1550 while (bufrem > 0) { 1551 if ((c = read(filefd, buf, 1552 MIN(blksize, bufrem))) <= 0) 1553 goto senddone; 1554 (void) alarm(curclass.timeout); 1555 bufrem -= c; 1556 byte_count += c; 1557 if (isdata) { 1558 total_data_out += c; 1559 total_data += c; 1560 } 1561 total_bytes_out += c; 1562 total_bytes += c; 1563 for (bufp = buf; c > 0; 1564 c -= d, bufp += d) 1565 if ((d = 1566 write(netfd, bufp, c)) <= 0) 1567 break; 1568 if (d < 0) 1569 goto data_err; 1570 } 1571 (void)gettimeofday(&now, NULL); 1572 timersub(&now, &then, &td); 1573 if (td.tv_sec == 0) 1574 usleep(1000000 - td.tv_usec); 1575 } 1576 } else { 1577 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1578 if (write(netfd, buf, c) != c) 1579 goto data_err; 1580 (void) alarm(curclass.timeout); 1581 byte_count += c; 1582 if (isdata) { 1583 total_data_out += c; 1584 total_data += c; 1585 } 1586 total_bytes_out += c; 1587 total_bytes += c; 1588 } 1589 } 1590 senddone: 1591 if (c < 0) 1592 goto file_err; 1593 rval = 0; 1594 goto cleanup_send_data; 1595 1596 default: 1597 reply(550, "Unimplemented TYPE %d in send_data", type); 1598 goto cleanup_send_data; 1599 } 1600 1601 data_err: 1602 (void) alarm(0); 1603 perror_reply(426, "Data connection"); 1604 goto cleanup_send_data; 1605 1606 file_err: 1607 (void) alarm(0); 1608 perror_reply(551, "Error on input file"); 1609 /* FALLTHROUGH */ 1610 1611 cleanup_send_data: 1612 (void) alarm(0); 1613 transflag = 0; 1614 if (buf) 1615 free(buf); 1616 if (isdata) { 1617 total_files_out++; 1618 total_files++; 1619 } 1620 total_xfers_out++; 1621 total_xfers++; 1622 return (rval); 1623 } 1624 1625 /* 1626 * Transfer data from peer to "outstr" using the appropriate encapulation of 1627 * the data subject to Mode, Structure, and Type. 1628 * 1629 * N.B.: Form isn't handled. 1630 */ 1631 static int 1632 receive_data(FILE *instr, FILE *outstr) 1633 { 1634 int c, bare_lfs, netfd, filefd, rval; 1635 char buf[BUFSIZ]; 1636 #ifdef __GNUC__ 1637 (void) &bare_lfs; 1638 #endif 1639 1640 bare_lfs = 0; 1641 transflag = 1; 1642 rval = -1; 1643 if (setjmp(urgcatch)) 1644 goto cleanup_recv_data; 1645 1646 switch (type) { 1647 1648 case TYPE_I: 1649 case TYPE_L: 1650 netfd = fileno(instr); 1651 filefd = fileno(outstr); 1652 (void) alarm(curclass.timeout); 1653 if (curclass.rateput) { 1654 while (1) { 1655 int d; 1656 struct timeval then, now, td; 1657 off_t bufrem; 1658 1659 (void)gettimeofday(&then, NULL); 1660 errno = c = d = 0; 1661 for (bufrem = curclass.rateput; bufrem > 0; ) { 1662 if ((c = read(netfd, buf, 1663 MIN(sizeof(buf), bufrem))) <= 0) 1664 goto recvdone; 1665 if ((d = write(filefd, buf, c)) != c) 1666 goto recvdone; 1667 (void) alarm(curclass.timeout); 1668 bufrem -= c; 1669 byte_count += c; 1670 total_data_in += c; 1671 total_data += c; 1672 total_bytes_in += c; 1673 total_bytes += c; 1674 } 1675 (void)gettimeofday(&now, NULL); 1676 timersub(&now, &then, &td); 1677 if (td.tv_sec == 0) 1678 usleep(1000000 - td.tv_usec); 1679 } 1680 } else { 1681 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1682 if (write(filefd, buf, c) != c) 1683 goto file_err; 1684 (void) alarm(curclass.timeout); 1685 byte_count += c; 1686 total_data_in += c; 1687 total_data += c; 1688 total_bytes_in += c; 1689 total_bytes += c; 1690 } 1691 } 1692 recvdone: 1693 if (c < 0) 1694 goto data_err; 1695 rval = 0; 1696 goto cleanup_recv_data; 1697 1698 case TYPE_E: 1699 reply(553, "TYPE E not implemented."); 1700 goto cleanup_recv_data; 1701 1702 case TYPE_A: 1703 (void) alarm(curclass.timeout); 1704 /* XXXLUKEM: rate limit ascii receive (put) */ 1705 while ((c = getc(instr)) != EOF) { 1706 byte_count++; 1707 total_data_in++; 1708 total_data++; 1709 total_bytes_in++; 1710 total_bytes++; 1711 if ((byte_count % 4096) == 0) 1712 (void) alarm(curclass.timeout); 1713 if (c == '\n') 1714 bare_lfs++; 1715 while (c == '\r') { 1716 if (ferror(outstr)) 1717 goto data_err; 1718 if ((c = getc(instr)) != '\n') { 1719 byte_count++; 1720 total_data_in++; 1721 total_data++; 1722 total_bytes_in++; 1723 total_bytes++; 1724 if ((byte_count % 4096) == 0) 1725 (void) alarm(curclass.timeout); 1726 (void) putc ('\r', outstr); 1727 if (c == '\0' || c == EOF) 1728 goto contin2; 1729 } 1730 } 1731 (void) putc(c, outstr); 1732 contin2: ; 1733 } 1734 (void) alarm(0); 1735 fflush(outstr); 1736 if (ferror(instr)) 1737 goto data_err; 1738 if (ferror(outstr)) 1739 goto file_err; 1740 if (bare_lfs) { 1741 reply(-226, 1742 "WARNING! %d bare linefeeds received in ASCII mode", 1743 bare_lfs); 1744 reply(0, "File may not have transferred correctly."); 1745 } 1746 rval = 0; 1747 goto cleanup_recv_data; 1748 1749 default: 1750 reply(550, "Unimplemented TYPE %d in receive_data", type); 1751 goto cleanup_recv_data; 1752 } 1753 1754 data_err: 1755 (void) alarm(0); 1756 perror_reply(426, "Data Connection"); 1757 goto cleanup_recv_data; 1758 1759 file_err: 1760 (void) alarm(0); 1761 perror_reply(452, "Error writing file"); 1762 goto cleanup_recv_data; 1763 1764 cleanup_recv_data: 1765 (void) alarm(0); 1766 transflag = 0; 1767 total_files_in++; 1768 total_files++; 1769 total_xfers_in++; 1770 total_xfers++; 1771 return (rval); 1772 } 1773 1774 void 1775 statcmd(void) 1776 { 1777 struct sockinet *su = NULL; 1778 static char ntop_buf[NI_MAXHOST]; 1779 u_char *a, *p; 1780 int ispassive, af; 1781 off_t otbi, otbo, otb; 1782 1783 a = p = (u_char *)NULL; 1784 1785 reply(-211, "%s FTP server status:", hostname); 1786 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 1787 ntop_buf[0] = '\0'; 1788 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 1789 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1790 && strcmp(remotehost, ntop_buf) != 0) 1791 reply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1792 else 1793 reply(0, "Connected to %s", remotehost); 1794 1795 if (logged_in) { 1796 if (curclass.type == CLASS_GUEST) 1797 reply(0, "Logged in anonymously"); 1798 else 1799 reply(0, "Logged in as %s%s", pw->pw_name, 1800 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1801 } else if (askpasswd) 1802 reply(0, "Waiting for password"); 1803 else 1804 reply(0, "Waiting for user name"); 1805 cprintf(stdout, " TYPE: %s", typenames[type]); 1806 if (type == TYPE_A || type == TYPE_E) 1807 cprintf(stdout, ", FORM: %s", formnames[form]); 1808 if (type == TYPE_L) { 1809 #if NBBY == 8 1810 cprintf(stdout, " %d", NBBY); 1811 #else 1812 /* XXX: `bytesize' needs to be defined in this case */ 1813 cprintf(stdout, " %d", bytesize); 1814 #endif 1815 } 1816 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 1817 strunames[stru], modenames[mode]); 1818 ispassive = 0; 1819 if (data != -1) { 1820 reply(0, "Data connection open"); 1821 su = NULL; 1822 } else if (pdata != -1) { 1823 reply(0, "in Passive mode"); 1824 su = (struct sockinet *)&pasv_addr; 1825 ispassive = 1; 1826 goto printaddr; 1827 } else if (usedefault == 0) { 1828 if (epsvall) { 1829 reply(0, "EPSV only mode (EPSV ALL)"); 1830 goto epsvonly; 1831 } 1832 su = (struct sockinet *)&data_dest; 1833 printaddr: 1834 /* PASV/PORT */ 1835 if (su->su_family == AF_INET) { 1836 a = (u_char *) &su->su_addr; 1837 p = (u_char *) &su->su_port; 1838 #define UC(b) (((int) b) & 0xff) 1839 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 1840 ispassive ? "PASV" : "PORT" , 1841 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1842 UC(p[0]), UC(p[1])); 1843 } 1844 1845 /* LPSV/LPRT */ 1846 { 1847 int alen, af, i; 1848 1849 alen = 0; 1850 switch (su->su_family) { 1851 case AF_INET: 1852 a = (u_char *) &su->su_addr; 1853 p = (u_char *) &su->su_port; 1854 alen = sizeof(su->su_addr); 1855 af = 4; 1856 break; 1857 #ifdef INET6 1858 case AF_INET6: 1859 a = (u_char *) &su->su_6addr; 1860 p = (u_char *) &su->su_port; 1861 alen = sizeof(su->su_6addr); 1862 af = 6; 1863 break; 1864 #endif 1865 default: 1866 af = 0; 1867 break; 1868 } 1869 if (af) { 1870 cprintf(stdout, " %s (%d,%d", 1871 ispassive ? "LPSV" : "LPRT", af, alen); 1872 for (i = 0; i < alen; i++) 1873 cprintf(stdout, ",%d", UC(a[i])); 1874 cprintf(stdout, ",%d,%d,%d)", 2, UC(p[0]), UC(p[1])); 1875 #undef UC 1876 } 1877 } 1878 1879 /* EPRT/EPSV */ 1880 epsvonly: 1881 af = af2epsvproto(su->su_family); 1882 ntop_buf[0] = '\0'; 1883 if (af > 0) { 1884 if (getnameinfo((struct sockaddr *)&su->si_su, 1885 su->su_len, ntop_buf, sizeof(ntop_buf), NULL, 0, 1886 NI_NUMERICHOST) == 0) 1887 reply(0, "%s (|%d|%s|%d|)", 1888 ispassive ? "EPSV" : "EPRT", 1889 af, ntop_buf, ntohs(su->su_port)); 1890 } 1891 } else 1892 reply(0, "No data connection"); 1893 1894 if (logged_in) { 1895 reply(0, 1896 "Data sent: " LLF " byte%s in " LLF " file%s", 1897 (LLT)total_data_out, PLURAL(total_data_out), 1898 (LLT)total_files_out, PLURAL(total_files_out)); 1899 reply(0, 1900 "Data received: " LLF " byte%s in " LLF " file%s", 1901 (LLT)total_data_in, PLURAL(total_data_in), 1902 (LLT)total_files_in, PLURAL(total_files_in)); 1903 reply(0, 1904 "Total data: " LLF " byte%s in " LLF " file%s", 1905 (LLT)total_data, PLURAL(total_data), 1906 (LLT)total_files, PLURAL(total_files)); 1907 } 1908 otbi = total_bytes_in; 1909 otbo = total_bytes_out; 1910 otb = total_bytes; 1911 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 1912 (LLT)otbo, PLURAL(otbo), 1913 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 1914 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 1915 (LLT)otbi, PLURAL(otbi), 1916 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 1917 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 1918 (LLT)otb, PLURAL(otb), 1919 (LLT)total_xfers, PLURAL(total_xfers)); 1920 1921 if (logged_in) { 1922 struct ftpconv *cp; 1923 1924 reply(0, "%s", ""); 1925 reply(0, "Class: %s, type: %s", 1926 curclass.classname, CURCLASSTYPE); 1927 reply(0, "Check PORT/LPRT commands: %sabled", 1928 curclass.checkportcmd ? "en" : "dis"); 1929 if (! EMPTYSTR(curclass.display)) 1930 reply(0, "Display file: %s", curclass.display); 1931 if (! EMPTYSTR(curclass.notify)) 1932 reply(0, "Notify fileglob: %s", curclass.notify); 1933 reply(0, "Idle timeout: %d, maximum timeout: %d", 1934 curclass.timeout, curclass.maxtimeout); 1935 reply(0, "Current connections: %d", connections); 1936 if (curclass.limit == -1) 1937 reply(0, "Maximum connections: unlimited"); 1938 else 1939 reply(0, "Maximum connections: %d", curclass.limit); 1940 if (curclass.limitfile) 1941 reply(0, "Connection limit exceeded file: %s", 1942 curclass.limitfile); 1943 if (! EMPTYSTR(curclass.chroot)) 1944 reply(0, "Chroot format: %s", curclass.chroot); 1945 if (! EMPTYSTR(curclass.homedir)) 1946 reply(0, "Homedir format: %s", curclass.homedir); 1947 if (! EMPTYSTR(curclass.motd)) 1948 reply(0, "MotD file: %s", curclass.motd); 1949 reply(0, 1950 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1951 curclass.modify ? "en" : "dis"); 1952 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 1953 curclass.upload ? "en" : "dis"); 1954 if (curclass.portmin && curclass.portmax) 1955 reply(0, "PASV port range: %d - %d", 1956 curclass.portmin, curclass.portmax); 1957 if (curclass.rateget) 1958 reply(0, "Rate get limit: %d bytes/sec", 1959 curclass.rateget); 1960 else 1961 reply(0, "Rate get limit: disabled"); 1962 if (curclass.rateput) 1963 reply(0, "Rate put limit: %d bytes/sec", 1964 curclass.rateput); 1965 else 1966 reply(0, "Rate put limit: disabled"); 1967 reply(0, "Umask: %.04o", curclass.umask); 1968 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1969 if (cp->suffix == NULL || cp->types == NULL || 1970 cp->command == NULL) 1971 continue; 1972 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 1973 cp->suffix, cp->types, cp->disable, cp->command); 1974 } 1975 } 1976 1977 reply(211, "End of status"); 1978 } 1979 1980 void 1981 fatal(const char *s) 1982 { 1983 1984 reply(451, "Error in server: %s\n", s); 1985 reply(221, "Closing connection due to server error."); 1986 dologout(0); 1987 /* NOTREACHED */ 1988 } 1989 1990 /* 1991 * reply() -- 1992 * depending on the value of n, display fmt with a trailing CRLF and 1993 * prefix of: 1994 * n < -1 prefix the message with abs(n) + "-" (initial line) 1995 * n == 0 prefix the message with 4 spaces (middle lines) 1996 * n > 0 prefix the message with n + " " (final line) 1997 */ 1998 void 1999 reply(int n, const char *fmt, ...) 2000 { 2001 off_t b; 2002 va_list ap; 2003 2004 va_start(ap, fmt); 2005 b = 0; 2006 if (n == 0) 2007 cprintf(stdout, " "); 2008 else if (n < 0) 2009 cprintf(stdout, "%d-", -n); 2010 else 2011 cprintf(stdout, "%d ", n); 2012 b = vprintf(fmt, ap); 2013 total_bytes += b; 2014 total_bytes_out += b; 2015 cprintf(stdout, "\r\n"); 2016 (void)fflush(stdout); 2017 if (debug) { 2018 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 2019 vsyslog(LOG_DEBUG, fmt, ap); 2020 } 2021 } 2022 2023 static void 2024 dolog(struct sockaddr *who) 2025 { 2026 2027 (void)getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), 2028 NULL, 0, 0); 2029 2030 #ifdef HASSETPROCTITLE 2031 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2032 setproctitle("%s", proctitle); 2033 #endif /* HASSETPROCTITLE */ 2034 if (logging) 2035 syslog(LOG_INFO, "connection from %s to %s", 2036 remotehost, hostname); 2037 } 2038 2039 /* 2040 * Record logout in wtmp file 2041 * and exit with supplied status. 2042 */ 2043 void 2044 dologout(int status) 2045 { 2046 /* 2047 * Prevent reception of SIGURG from resulting in a resumption 2048 * back to the main program loop. 2049 */ 2050 transflag = 0; 2051 2052 if (logged_in) { 2053 if (dowtmp) 2054 logwtmp(ttyline, "", ""); 2055 if (doutmp) 2056 logout(utmp.ut_line); 2057 #ifdef KERBEROS 2058 if (!notickets && krbtkfile_env) 2059 unlink(krbtkfile_env); 2060 #endif 2061 } 2062 /* beware of flushing buffers after a SIGPIPE */ 2063 _exit(status); 2064 } 2065 2066 static void 2067 myoob(int signo) 2068 { 2069 char *cp; 2070 2071 /* only process if transfer occurring */ 2072 if (!transflag) 2073 return; 2074 cp = tmpline; 2075 if (getline(cp, 7, stdin) == NULL) { 2076 reply(221, "You could at least say goodbye."); 2077 dologout(0); 2078 } 2079 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2080 tmpline[0] = '\0'; 2081 reply(426, "Transfer aborted. Data connection closed."); 2082 reply(226, "Abort successful"); 2083 longjmp(urgcatch, 1); 2084 } 2085 if (strcasecmp(cp, "STAT\r\n") == 0) { 2086 tmpline[0] = '\0'; 2087 if (file_size != (off_t) -1) 2088 reply(213, 2089 "Status: " LLF " of " LLF " byte%s transferred", 2090 (LLT)byte_count, (LLT)file_size, 2091 PLURAL(byte_count)); 2092 else 2093 reply(213, "Status: " LLF " byte%s transferred", 2094 (LLT)byte_count, PLURAL(byte_count)); 2095 } 2096 } 2097 2098 static int 2099 bind_pasv_addr(void) 2100 { 2101 static int passiveport; 2102 int port, len; 2103 2104 len = pasv_addr.su_len; 2105 if (curclass.portmin == 0 && curclass.portmax == 0) { 2106 pasv_addr.su_port = 0; 2107 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2108 } 2109 2110 if (passiveport == 0) { 2111 srand(getpid()); 2112 passiveport = rand() % (curclass.portmax - curclass.portmin) 2113 + curclass.portmin; 2114 } 2115 2116 port = passiveport; 2117 while (1) { 2118 port++; 2119 if (port > curclass.portmax) 2120 port = curclass.portmin; 2121 else if (port == passiveport) { 2122 errno = EAGAIN; 2123 return (-1); 2124 } 2125 pasv_addr.su_port = htons(port); 2126 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 2127 break; 2128 if (errno != EADDRINUSE) 2129 return (-1); 2130 } 2131 passiveport = port; 2132 return (0); 2133 } 2134 2135 /* 2136 * Note: a response of 425 is not mentioned as a possible response to 2137 * the PASV command in RFC959. However, it has been blessed as 2138 * a legitimate response by Jon Postel in a telephone conversation 2139 * with Rick Adams on 25 Jan 89. 2140 */ 2141 void 2142 passive(void) 2143 { 2144 int len; 2145 char *p, *a; 2146 2147 if (pdata >= 0) 2148 close(pdata); 2149 pdata = socket(AF_INET, SOCK_STREAM, 0); 2150 if (pdata < 0 || !logged_in) { 2151 perror_reply(425, "Can't open passive connection"); 2152 return; 2153 } 2154 pasv_addr = ctrl_addr; 2155 2156 if (bind_pasv_addr() < 0) 2157 goto pasv_error; 2158 len = pasv_addr.su_len; 2159 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2160 goto pasv_error; 2161 pasv_addr.su_len = len; 2162 if (listen(pdata, 1) < 0) 2163 goto pasv_error; 2164 a = (char *) &pasv_addr.su_addr; 2165 p = (char *) &pasv_addr.su_port; 2166 2167 #define UC(b) (((int) b) & 0xff) 2168 2169 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2170 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2171 return; 2172 2173 pasv_error: 2174 (void) close(pdata); 2175 pdata = -1; 2176 perror_reply(425, "Can't open passive connection"); 2177 return; 2178 } 2179 2180 /* 2181 * convert protocol identifier to/from AF 2182 */ 2183 int 2184 lpsvproto2af(int proto) 2185 { 2186 2187 switch (proto) { 2188 case 4: 2189 return AF_INET; 2190 #ifdef INET6 2191 case 6: 2192 return AF_INET6; 2193 #endif 2194 default: 2195 return -1; 2196 } 2197 } 2198 2199 int 2200 af2lpsvproto(int af) 2201 { 2202 2203 switch (af) { 2204 case AF_INET: 2205 return 4; 2206 #ifdef INET6 2207 case AF_INET6: 2208 return 6; 2209 #endif 2210 default: 2211 return -1; 2212 } 2213 } 2214 2215 int 2216 epsvproto2af(int proto) 2217 { 2218 2219 switch (proto) { 2220 case 1: 2221 return AF_INET; 2222 #ifdef INET6 2223 case 2: 2224 return AF_INET6; 2225 #endif 2226 default: 2227 return -1; 2228 } 2229 } 2230 2231 int 2232 af2epsvproto(int af) 2233 { 2234 2235 switch (af) { 2236 case AF_INET: 2237 return 1; 2238 #ifdef INET6 2239 case AF_INET6: 2240 return 2; 2241 #endif 2242 default: 2243 return -1; 2244 } 2245 } 2246 2247 /* 2248 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2249 * 229 Entering Extended Passive Mode (|||port|) 2250 */ 2251 void 2252 long_passive(char *cmd, int pf) 2253 { 2254 int len; 2255 char *p, *a; 2256 2257 if (!logged_in) { 2258 syslog(LOG_NOTICE, "long passive but not logged in"); 2259 reply(503, "Login with USER first."); 2260 return; 2261 } 2262 2263 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2264 /* 2265 * XXX 2266 * only EPRT/EPSV ready clients will understand this 2267 */ 2268 if (strcmp(cmd, "EPSV") != 0) 2269 reply(501, "Network protocol mismatch"); /*XXX*/ 2270 else 2271 epsv_protounsupp("Network protocol mismatch"); 2272 2273 return; 2274 } 2275 2276 if (pdata >= 0) 2277 close(pdata); 2278 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2279 if (pdata < 0) { 2280 perror_reply(425, "Can't open passive connection"); 2281 return; 2282 } 2283 pasv_addr = ctrl_addr; 2284 if (bind_pasv_addr() < 0) 2285 goto pasv_error; 2286 len = pasv_addr.su_len; 2287 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2288 goto pasv_error; 2289 pasv_addr.su_len = len; 2290 if (listen(pdata, 1) < 0) 2291 goto pasv_error; 2292 p = (char *) &pasv_addr.su_port; 2293 2294 #define UC(b) (((int) b) & 0xff) 2295 2296 if (strcmp(cmd, "LPSV") == 0) { 2297 switch (pasv_addr.su_family) { 2298 case AF_INET: 2299 a = (char *) &pasv_addr.su_addr; 2300 reply(228, 2301 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2302 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2303 2, UC(p[0]), UC(p[1])); 2304 return; 2305 #ifdef INET6 2306 case AF_INET6: 2307 a = (char *) &pasv_addr.su_6addr; 2308 reply(228, 2309 "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)", 2310 6, 16, 2311 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2312 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2313 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2314 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2315 2, UC(p[0]), UC(p[1])); 2316 return; 2317 #endif 2318 } 2319 #undef UC 2320 } else if (strcmp(cmd, "EPSV") == 0) { 2321 switch (pasv_addr.su_family) { 2322 case AF_INET: 2323 #ifdef INET6 2324 case AF_INET6: 2325 #endif 2326 reply(229, "Entering Extended Passive Mode (|||%d|)", 2327 ntohs(pasv_addr.su_port)); 2328 return; 2329 } 2330 } else { 2331 /* more proper error code? */ 2332 } 2333 2334 pasv_error: 2335 (void) close(pdata); 2336 pdata = -1; 2337 perror_reply(425, "Can't open passive connection"); 2338 return; 2339 } 2340 2341 int 2342 extended_port(const char *arg) 2343 { 2344 char *tmp = NULL; 2345 char *result[3]; 2346 char *p, *q; 2347 char delim; 2348 struct addrinfo hints; 2349 struct addrinfo *res = NULL; 2350 int i; 2351 unsigned long proto; 2352 2353 tmp = xstrdup(arg); 2354 p = tmp; 2355 delim = p[0]; 2356 p++; 2357 memset(result, 0, sizeof(result)); 2358 for (i = 0; i < 3; i++) { 2359 q = strchr(p, delim); 2360 if (!q || *q != delim) 2361 goto parsefail; 2362 *q++ = '\0'; 2363 result[i] = p; 2364 p = q; 2365 } 2366 2367 /* some more sanity check */ 2368 p = NULL; 2369 (void)strtoul(result[2], &p, 10); 2370 if (!*result[2] || *p) 2371 goto parsefail; 2372 p = NULL; 2373 proto = strtoul(result[0], &p, 10); 2374 if (!*result[0] || *p) 2375 goto protounsupp; 2376 2377 memset(&hints, 0, sizeof(hints)); 2378 hints.ai_family = epsvproto2af((int)proto); 2379 if (hints.ai_family < 0) 2380 goto protounsupp; 2381 hints.ai_socktype = SOCK_STREAM; 2382 hints.ai_flags = AI_NUMERICHOST; 2383 if (getaddrinfo(result[1], result[2], &hints, &res)) 2384 goto parsefail; 2385 if (res->ai_next) 2386 goto parsefail; 2387 if (sizeof(data_dest) < res->ai_addrlen) 2388 goto parsefail; 2389 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2390 if (his_addr.su_family == AF_INET6 && 2391 data_dest.su_family == AF_INET6) { 2392 /* XXX more sanity checks! */ 2393 data_dest.su_scope_id = his_addr.su_scope_id; 2394 } 2395 2396 if (tmp != NULL) 2397 free(tmp); 2398 if (res) 2399 freeaddrinfo(res); 2400 return 0; 2401 2402 parsefail: 2403 reply(500, "Invalid argument, rejected."); 2404 usedefault = 1; 2405 if (tmp != NULL) 2406 free(tmp); 2407 if (res) 2408 freeaddrinfo(res); 2409 return -1; 2410 2411 protounsupp: 2412 epsv_protounsupp("Protocol not supported"); 2413 usedefault = 1; 2414 if (tmp != NULL) 2415 free(tmp); 2416 if (res) 2417 freeaddrinfo(res); 2418 return -1; 2419 } 2420 2421 /* 2422 * 522 Protocol not supported (proto,...) 2423 * as we assume address family for control and data connections are the same, 2424 * we do not return the list of address families we support - instead, we 2425 * return the address family of the control connection. 2426 */ 2427 void 2428 epsv_protounsupp(const char *message) 2429 { 2430 int proto; 2431 2432 proto = af2epsvproto(ctrl_addr.su_family); 2433 if (proto < 0) 2434 reply(501, "%s", message); /*XXX*/ 2435 else 2436 reply(522, "%s, use (%d)", message, proto); 2437 } 2438 2439 /* 2440 * Generate unique name for file with basename "local". 2441 * The file named "local" is already known to exist. 2442 * Generates failure reply on error. 2443 * 2444 * XXX: this function should under go changes similar to 2445 * the mktemp(3)/mkstemp(3) changes. 2446 */ 2447 static char * 2448 gunique(const char *local) 2449 { 2450 static char new[MAXPATHLEN]; 2451 struct stat st; 2452 char *cp; 2453 int count; 2454 2455 cp = strrchr(local, '/'); 2456 if (cp) 2457 *cp = '\0'; 2458 if (stat(cp ? local : ".", &st) < 0) { 2459 perror_reply(553, cp ? local : "."); 2460 return (NULL); 2461 } 2462 if (cp) 2463 *cp = '/'; 2464 for (count = 1; count < 100; count++) { 2465 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2466 if (stat(new, &st) < 0) 2467 return (new); 2468 } 2469 reply(452, "Unique file name cannot be created."); 2470 return (NULL); 2471 } 2472 2473 /* 2474 * Format and send reply containing system error number. 2475 */ 2476 void 2477 perror_reply(int code, const char *string) 2478 { 2479 int save_errno; 2480 2481 save_errno = errno; 2482 reply(code, "%s: %s.", string, strerror(errno)); 2483 errno = save_errno; 2484 } 2485 2486 static char *onefile[] = { 2487 "", 2488 0 2489 }; 2490 2491 void 2492 send_file_list(const char *whichf) 2493 { 2494 struct stat st; 2495 DIR *dirp = NULL; 2496 struct dirent *dir; 2497 FILE *dout = NULL; 2498 char **dirlist, *dirname, *p; 2499 int simple = 0; 2500 int freeglob = 0; 2501 glob_t gl; 2502 off_t b; 2503 2504 #ifdef __GNUC__ 2505 (void) &dout; 2506 (void) &dirlist; 2507 (void) &simple; 2508 (void) &freeglob; 2509 #endif 2510 2511 p = NULL; 2512 if (strpbrk(whichf, "~{[*?") != NULL) { 2513 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2514 2515 memset(&gl, 0, sizeof(gl)); 2516 freeglob = 1; 2517 if (glob(whichf, flags, 0, &gl)) { 2518 reply(550, "not found"); 2519 goto out; 2520 } else if (gl.gl_pathc == 0) { 2521 errno = ENOENT; 2522 perror_reply(550, whichf); 2523 goto out; 2524 } 2525 dirlist = gl.gl_pathv; 2526 } else { 2527 p = xstrdup(whichf); 2528 onefile[0] = p; 2529 dirlist = onefile; 2530 simple = 1; 2531 } 2532 /* XXX: } for vi sm */ 2533 2534 if (setjmp(urgcatch)) { 2535 transflag = 0; 2536 goto out; 2537 } 2538 while ((dirname = *dirlist++) != NULL) { 2539 int trailingslash = 0; 2540 2541 if (stat(dirname, &st) < 0) { 2542 /* 2543 * If user typed "ls -l", etc, and the client 2544 * used NLST, do what the user meant. 2545 */ 2546 /* XXX: nuke this support? */ 2547 if (dirname[0] == '-' && *dirlist == NULL && 2548 transflag == 0) { 2549 char *argv[] = { INTERNAL_LS, "", NULL }; 2550 2551 argv[1] = dirname; 2552 retrieve(argv, dirname); 2553 goto out; 2554 } 2555 perror_reply(550, whichf); 2556 goto cleanup_send_file_list; 2557 } 2558 2559 if (S_ISREG(st.st_mode)) { 2560 if (dout == NULL) { 2561 dout = dataconn("file list", (off_t)-1, "w"); 2562 if (dout == NULL) 2563 goto out; 2564 transflag++; 2565 } 2566 b = fprintf(dout, "%s%s\n", dirname, 2567 type == TYPE_A ? "\r" : ""); 2568 total_bytes += b; 2569 total_bytes_out += b; 2570 byte_count += strlen(dirname) + 1; 2571 continue; 2572 } else if (!S_ISDIR(st.st_mode)) 2573 continue; 2574 2575 if (dirname[strlen(dirname) - 1] == '/') 2576 trailingslash++; 2577 2578 if ((dirp = opendir(dirname)) == NULL) 2579 continue; 2580 2581 while ((dir = readdir(dirp)) != NULL) { 2582 char nbuf[MAXPATHLEN]; 2583 2584 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2585 continue; 2586 2587 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2588 trailingslash ? "" : "/", dir->d_name); 2589 2590 /* 2591 * We have to do a stat to ensure it's 2592 * not a directory or special file. 2593 */ 2594 /* XXX: follow RFC959 and filter out non files ? */ 2595 if (simple || (stat(nbuf, &st) == 0 && 2596 S_ISREG(st.st_mode))) { 2597 char *p; 2598 2599 if (dout == NULL) { 2600 dout = dataconn("file list", (off_t)-1, 2601 "w"); 2602 if (dout == NULL) 2603 goto out; 2604 transflag++; 2605 } 2606 p = nbuf; 2607 if (nbuf[0] == '.' && nbuf[1] == '/') 2608 p = &nbuf[2]; 2609 b = fprintf(dout, "%s%s\n", p, 2610 type == TYPE_A ? "\r" : ""); 2611 total_bytes += b; 2612 total_bytes_out += b; 2613 byte_count += strlen(nbuf) + 1; 2614 } 2615 } 2616 (void) closedir(dirp); 2617 } 2618 2619 if (dout == NULL) 2620 reply(550, "No files found."); 2621 else if (ferror(dout) != 0) 2622 perror_reply(550, "Data connection"); 2623 else 2624 reply(226, "Transfer complete."); 2625 2626 cleanup_send_file_list: 2627 transflag = 0; 2628 closedataconn(dout); 2629 out: 2630 total_xfers++; 2631 total_xfers_out++; 2632 if (p) 2633 free(p); 2634 if (freeglob) 2635 globfree(&gl); 2636 } 2637 2638 char * 2639 conffilename(const char *s) 2640 { 2641 static char filename[MAXPATHLEN]; 2642 2643 if (*s == '/') 2644 strlcpy(filename, s, sizeof(filename)); 2645 else 2646 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2647 return (filename); 2648 } 2649 2650 /* 2651 * logcmd -- 2652 * based on the arguments, syslog a message: 2653 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2654 * else if file2 != NULL "<command> <file1> <file2>" 2655 * else "<command> <file1>" 2656 * if elapsed != NULL, append "in xxx.yyy seconds" 2657 * if error != NULL, append ": " + error 2658 */ 2659 void 2660 logcmd(const char *command, off_t bytes, const char *file1, const char *file2, 2661 const struct timeval *elapsed, const char *error) 2662 { 2663 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2664 const char *p; 2665 size_t len; 2666 2667 if (logging <=1) 2668 return; 2669 2670 if ((p = realpath(file1, realfile)) == NULL) 2671 p = file1; 2672 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2673 2674 if (bytes != (off_t)-1) { 2675 len += snprintf(buf + len, sizeof(buf) - len, 2676 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 2677 } else if (file2 != NULL) { 2678 if ((p = realpath(file2, realfile)) == NULL) 2679 p = file2; 2680 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2681 } 2682 2683 if (elapsed != NULL) { 2684 len += snprintf(buf + len, sizeof(buf) - len, 2685 " in %ld.%.03d seconds", elapsed->tv_sec, 2686 (int)(elapsed->tv_usec / 1000)); 2687 } 2688 2689 if (error != NULL) 2690 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2691 2692 syslog(LOG_INFO, "%s", buf); 2693 } 2694 2695 char * 2696 xstrdup(const char *s) 2697 { 2698 char *new = strdup(s); 2699 2700 if (new == NULL) 2701 fatal("Local resource failure: malloc"); 2702 /* NOTREACHED */ 2703 return (new); 2704 } 2705 2706 /* 2707 * As per fprintf(), but increment total_bytes and total_bytes_out, 2708 * by the appropriate amount. 2709 */ 2710 void 2711 cprintf(FILE *fd, const char *fmt, ...) 2712 { 2713 off_t b; 2714 va_list ap; 2715 2716 va_start(ap, fmt); 2717 b = vfprintf(fd, fmt, ap); 2718 total_bytes += b; 2719 total_bytes_out += b; 2720 } 2721
Indexes created Mon Sep 29 21:09:56 GMT 2025