ftpd.c revision 1.103
1 /* $NetBSD: ftpd.c,v 1.103 2000/07/29 08:20:02 martin 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 1.103 2000/07/29 08:20:02 martin 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 addrlen = sizeof(his_addr); /* xxx */ 334 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 335 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 336 exit(1); 337 } 338 addrlen = sizeof(ctrl_addr); 339 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 340 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 341 exit(1); 342 } 343 if (his_addr.su_family == AF_INET6 344 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 345 #if 1 346 /* 347 * IPv4 control connection arrived to AF_INET6 socket. 348 * I hate to do this, but this is the easiest solution. 349 * 350 * The assumption is untrue on SIIT environment. 351 */ 352 union sockunion tmp_addr; 353 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 354 355 tmp_addr = his_addr; 356 memset(&his_addr, 0, sizeof(his_addr)); 357 his_addr.su_sin.sin_family = AF_INET; 358 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 359 memcpy(&his_addr.su_sin.sin_addr, 360 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 361 sizeof(his_addr.su_sin.sin_addr)); 362 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 363 364 tmp_addr = ctrl_addr; 365 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 366 ctrl_addr.su_sin.sin_family = AF_INET; 367 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 368 memcpy(&ctrl_addr.su_sin.sin_addr, 369 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 370 sizeof(ctrl_addr.su_sin.sin_addr)); 371 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 372 #else 373 while (fgets(line, sizeof(line), fd) != NULL) { 374 if ((cp = strchr(line, '\n')) != NULL) 375 *cp = '\0'; 376 reply(-530, "%s", line); 377 } 378 (void) fflush(stdout); 379 (void) fclose(fd); 380 reply(530, 381 "Connection from IPv4 mapped address is not supported."); 382 exit(0); 383 #endif 384 385 mapped = 1; 386 } else 387 mapped = 0; 388 #ifdef IP_TOS 389 if (!mapped && his_addr.su_family == AF_INET) { 390 tos = IPTOS_LOWDELAY; 391 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 392 sizeof(int)) < 0) 393 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 394 } 395 #endif 396 /* if the hostname hasn't been given, attempt to determine it */ 397 if (hostname[0] == '\0') { 398 if (getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 399 hostname, sizeof(hostname), NULL, 0, 0) != 0) 400 (void)gethostname(hostname, sizeof(hostname)); 401 hostname[sizeof(hostname) - 1] = '\0'; 402 } 403 404 /* set this here so klogin can use it... */ 405 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 406 407 (void) freopen(_PATH_DEVNULL, "w", stderr); 408 (void) signal(SIGPIPE, lostconn); 409 (void) signal(SIGCHLD, SIG_IGN); 410 if (signal(SIGURG, myoob) == SIG_ERR) 411 syslog(LOG_ERR, "signal: %m"); 412 413 /* Try to handle urgent data inline */ 414 #ifdef SO_OOBINLINE 415 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 416 syslog(LOG_ERR, "setsockopt: %m"); 417 #endif 418 /* Set keepalives on the socket to detect dropped connections. */ 419 #ifdef SO_KEEPALIVE 420 keepalive = 1; 421 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 422 sizeof(int)) < 0) 423 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 424 #endif 425 426 #ifdef F_SETOWN 427 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 428 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 429 #endif 430 dolog((struct sockaddr *)&his_addr); 431 /* 432 * Set up default state 433 */ 434 data = -1; 435 type = TYPE_A; 436 form = FORM_N; 437 stru = STRU_F; 438 mode = MODE_S; 439 tmpline[0] = '\0'; 440 hasyyerrored = 0; 441 442 #ifdef KERBEROS5 443 kerror = krb5_init_context(&kcontext); 444 if (kerror) { 445 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 446 error_message(kerror)); 447 exit(0); 448 } 449 #endif /* KERBEROS5 */ 450 451 init_curclass(); 452 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 453 curclass.type = CLASS_REAL; 454 455 /* If logins are disabled, print out the message. */ 456 if (display_file(_PATH_NOLOGIN, 530)) { 457 reply(530, "System not available."); 458 exit(0); 459 } 460 (void)display_file(conffilename(_PATH_FTPWELCOME), 220); 461 /* reply(220,) must follow */ 462 if (EMPTYSTR(version)) 463 reply(220, "%s FTP server ready.", hostname); 464 else 465 reply(220, "%s FTP server (%s) ready.", hostname, version); 466 467 (void) setjmp(errcatch); 468 for (;;) 469 (void) yyparse(); 470 /* NOTREACHED */ 471 } 472 473 static void 474 lostconn(int signo) 475 { 476 477 if (debug) 478 syslog(LOG_DEBUG, "lost connection"); 479 dologout(1); 480 } 481 482 /* 483 * Save the result of a getpwnam. Used for USER command, since 484 * the data returned must not be clobbered by any other command 485 * (e.g., globbing). 486 */ 487 static struct passwd * 488 sgetpwnam(const char *name) 489 { 490 static struct passwd save; 491 struct passwd *p; 492 493 if ((p = getpwnam(name)) == NULL) 494 return (p); 495 if (save.pw_name) { 496 free((char *)save.pw_name); 497 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 498 free((char *)save.pw_passwd); 499 free((char *)save.pw_gecos); 500 free((char *)save.pw_dir); 501 free((char *)save.pw_shell); 502 } 503 save = *p; 504 save.pw_name = xstrdup(p->pw_name); 505 save.pw_passwd = xstrdup(p->pw_passwd); 506 save.pw_gecos = xstrdup(p->pw_gecos); 507 save.pw_dir = xstrdup(p->pw_dir); 508 save.pw_shell = xstrdup(p->pw_shell); 509 return (&save); 510 } 511 512 static int login_attempts; /* number of failed login attempts */ 513 static int askpasswd; /* had user command, ask for passwd */ 514 static char curname[10]; /* current USER name */ 515 516 /* 517 * USER command. 518 * Sets global passwd pointer pw if named account exists and is acceptable; 519 * sets askpasswd if a PASS command is expected. If logged in previously, 520 * need to reset state. If name is "ftp" or "anonymous", the name is not in 521 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 522 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 523 * requesting login privileges. Disallow anyone who does not have a standard 524 * shell as returned by getusershell(). Disallow anyone mentioned in the file 525 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 526 */ 527 void 528 user(const char *name) 529 { 530 if (logged_in) { 531 switch (curclass.type) { 532 case CLASS_GUEST: 533 reply(530, "Can't change user from guest login."); 534 return; 535 case CLASS_CHROOT: 536 reply(530, "Can't change user from chroot user."); 537 return; 538 case CLASS_REAL: 539 if (dropprivs) { 540 reply(530, "Can't change user."); 541 return; 542 } 543 end_login(); 544 break; 545 default: 546 abort(); 547 } 548 } 549 550 #if defined(KERBEROS) 551 kdestroy(); 552 #endif 553 #if defined(KERBEROS5) 554 k5destroy(); 555 #endif 556 557 curclass.type = CLASS_REAL; 558 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 559 /* need `pw' setup for checkaccess() and checkuser () */ 560 if ((pw = sgetpwnam("ftp")) == NULL) 561 reply(530, "User %s unknown.", name); 562 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 563 reply(530, "User %s access denied.", name); 564 else { 565 curclass.type = CLASS_GUEST; 566 askpasswd = 1; 567 reply(331, 568 "Guest login ok, type your name as password."); 569 } 570 if (!askpasswd && logging) 571 syslog(LOG_NOTICE, 572 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 573 return; 574 } 575 576 pw = sgetpwnam(name); 577 if (logging) 578 strlcpy(curname, name, sizeof(curname)); 579 580 #ifdef SKEY 581 if (skey_haskey(name) == 0) { 582 const char *myskey; 583 584 myskey = skey_keyinfo(name); 585 reply(331, "Password [%s] required for %s.", 586 myskey ? myskey : "error getting challenge", name); 587 } else 588 #endif 589 reply(331, "Password required for %s.", name); 590 591 askpasswd = 1; 592 /* 593 * Delay before reading passwd after first failed 594 * attempt to slow down passwd-guessing programs. 595 */ 596 if (login_attempts) 597 sleep((unsigned) login_attempts); 598 } 599 600 /* 601 * Determine whether something is to happen (allow access, chroot) 602 * for a user. Each line is a shell-style glob followed by 603 * `yes' or `no'. 604 * 605 * For backward compatability, `allow' and `deny' are synonymns 606 * for `yes' and `no', respectively. 607 * 608 * Each glob is matched against the username in turn, and the first 609 * match found is used. If no match is found, the result is the 610 * argument `def'. If a match is found but without and explicit 611 * `yes'/`no', the result is the opposite of def. 612 * 613 * If the file doesn't exist at all, the result is the argument 614 * `nofile' 615 * 616 * Any line starting with `#' is considered a comment and ignored. 617 * 618 * Returns 0 if the user is denied, or 1 if they are allowed. 619 * 620 * NOTE: needs struct passwd *pw setup before use. 621 */ 622 int 623 checkuser(const char *fname, const char *name, int def, int nofile, 624 char **retclass) 625 { 626 FILE *fd; 627 int retval; 628 char *glob, *perm, *class, *buf, *p; 629 size_t len, line; 630 631 retval = def; 632 if (retclass != NULL) 633 *retclass = NULL; 634 if ((fd = fopen(conffilename(fname), "r")) == NULL) 635 return nofile; 636 637 line = 0; 638 for (; 639 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 640 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 641 free(buf), buf = NULL) { 642 glob = perm = class = NULL; 643 p = buf; 644 if (len < 1) 645 continue; 646 if (p[len - 1] == '\n') 647 p[--len] = '\0'; 648 if (EMPTYSTR(p)) 649 continue; 650 651 NEXTWORD(p, glob); 652 NEXTWORD(p, perm); 653 NEXTWORD(p, class); 654 if (EMPTYSTR(glob)) 655 continue; 656 if (!EMPTYSTR(class)) { 657 if (strcasecmp(class, "all") == 0 || 658 strcasecmp(class, "none") == 0) { 659 syslog(LOG_WARNING, 660 "%s line %d: illegal user-defined class `%s' - skipping entry", 661 fname, (int)line, class); 662 continue; 663 } 664 } 665 666 /* have a host specifier */ 667 if ((p = strchr(glob, '@')) != NULL) { 668 u_int32_t net, mask, addr; 669 int bits; 670 671 *p++ = '\0'; 672 /* check against network or CIDR */ 673 if (isdigit(*p) && 674 (bits = inet_net_pton(AF_INET, p, 675 &net, sizeof(net))) != -1) { 676 net = ntohl(net); 677 mask = 0xffffffffU << (32 - bits); 678 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 679 if ((addr & mask) != net) 680 continue; 681 682 /* check against hostname glob */ 683 } else if (fnmatch(p, remotehost, 0) != 0) 684 continue; 685 } 686 687 /* have a group specifier */ 688 if ((p = strchr(glob, ':')) != NULL) { 689 gid_t *groups, *ng; 690 int gsize, i, found; 691 692 *p++ = '\0'; 693 groups = NULL; 694 gsize = 16; 695 do { 696 ng = realloc(groups, gsize * sizeof(gid_t)); 697 if (ng == NULL) 698 fatal( 699 "Local resource failure: realloc"); 700 groups = ng; 701 } while (getgrouplist(pw->pw_name, pw->pw_gid, 702 groups, &gsize) == -1); 703 found = 0; 704 for (i = 0; i < gsize; i++) { 705 struct group *g; 706 707 if ((g = getgrgid(groups[i])) == NULL) 708 continue; 709 if (fnmatch(p, g->gr_name, 0) == 0) { 710 found = 1; 711 break; 712 } 713 } 714 free(groups); 715 if (!found) 716 continue; 717 } 718 719 /* check against username glob */ 720 if (fnmatch(glob, name, 0) != 0) 721 continue; 722 723 if (perm != NULL && 724 ((strcasecmp(perm, "allow") == 0) || 725 (strcasecmp(perm, "yes") == 0))) 726 retval = 1; 727 else if (perm != NULL && 728 ((strcasecmp(perm, "deny") == 0) || 729 (strcasecmp(perm, "no") == 0))) 730 retval = 0; 731 else 732 retval = !def; 733 if (!EMPTYSTR(class) && retclass != NULL) 734 *retclass = xstrdup(class); 735 free(buf); 736 break; 737 } 738 (void) fclose(fd); 739 return (retval); 740 } 741 742 /* 743 * Check if user is allowed by /etc/ftpusers 744 * returns 1 for yes, 0 for no 745 * 746 * NOTE: needs struct passwd *pw setup (for checkuser()) 747 */ 748 int 749 checkaccess(const char *name) 750 { 751 752 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 753 } 754 755 /* 756 * Terminate login as previous user, if any, resetting state; 757 * used when USER command is given or login fails. 758 */ 759 static void 760 end_login(void) 761 { 762 763 if (logged_in) { 764 if (dowtmp) 765 logwtmp(ttyline, "", ""); 766 if (doutmp) 767 logout(utmp.ut_line); 768 } 769 /* reset login state */ 770 (void) seteuid((uid_t)0); 771 pw = NULL; 772 logged_in = 0; 773 quietmessages = 0; 774 gidcount = 0; 775 curclass.type = CLASS_REAL; 776 } 777 778 void 779 pass(const char *passwd) 780 { 781 int rval; 782 const char *cp, *shell; 783 char *class, root[MAXPATHLEN]; 784 785 class = NULL; 786 if (logged_in || askpasswd == 0) { 787 reply(503, "Login with USER first."); 788 return; 789 } 790 askpasswd = 0; 791 if (curclass.type != CLASS_GUEST) { 792 /* "ftp" is the only account allowed with no password */ 793 if (pw == NULL) { 794 rval = 1; /* failure below */ 795 goto skip; 796 } 797 #if defined(KERBEROS) 798 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 799 rval = 0; 800 goto skip; 801 } 802 #endif 803 #if defined(KERBEROS5) 804 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 805 rval = 0; 806 goto skip; 807 } 808 #endif 809 #ifdef SKEY 810 if (skey_haskey(pw->pw_name) == 0) { 811 char *p; 812 int r; 813 814 p = xstrdup(passwd); 815 r = skey_passcheck(pw->pw_name, p); 816 free(p); 817 if (r != -1) { 818 rval = 0; 819 goto skip; 820 } 821 } 822 #endif 823 if (!sflag && *pw->pw_passwd != '\0' && 824 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 825 rval = 0; 826 goto skip; 827 } 828 rval = 1; 829 830 skip: 831 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 832 rval = 2; 833 834 /* 835 * If rval > 0, the user failed the authentication check 836 * above. If rval == 0, either Kerberos or local 837 * authentication succeeded. 838 */ 839 if (rval) { 840 reply(530, "%s", rval == 2 ? "Password expired." : 841 "Login incorrect."); 842 if (logging) { 843 syslog(LOG_NOTICE, 844 "FTP LOGIN FAILED FROM %s", remotehost); 845 syslog(LOG_AUTHPRIV | LOG_NOTICE, 846 "FTP LOGIN FAILED FROM %s, %s", 847 remotehost, curname); 848 } 849 pw = NULL; 850 if (login_attempts++ >= 5) { 851 syslog(LOG_NOTICE, 852 "repeated login failures from %s", 853 remotehost); 854 exit(0); 855 } 856 return; 857 } 858 } 859 860 /* password ok; see if anything else prevents login */ 861 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 862 reply(530, "User %s may not use FTP.", pw->pw_name); 863 if (logging) 864 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 865 remotehost, pw->pw_name); 866 goto bad; 867 } 868 /* if not guest user, check for valid shell */ 869 if ((shell = pw->pw_shell) == NULL || *shell == 0) 870 shell = _PATH_BSHELL; 871 while ((cp = getusershell()) != NULL) 872 if (strcmp(cp, shell) == 0) 873 break; 874 endusershell(); 875 if (cp == NULL && curclass.type != CLASS_GUEST) { 876 reply(530, "User %s may not use FTP.", pw->pw_name); 877 if (logging) 878 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 879 remotehost, pw->pw_name); 880 goto bad; 881 } 882 883 login_attempts = 0; /* this time successful */ 884 if (setegid((gid_t)pw->pw_gid) < 0) { 885 reply(550, "Can't set gid."); 886 goto bad; 887 } 888 (void) initgroups(pw->pw_name, pw->pw_gid); 889 /* cache groups for cmds.c::matchgroup() */ 890 gidcount = getgroups(sizeof(gidlist), gidlist); 891 892 /* open wtmp before chroot */ 893 if (dowtmp) 894 logwtmp(ttyline, pw->pw_name, remotehost); 895 896 /* open utmp before chroot */ 897 if (doutmp) { 898 memset((void *)&utmp, 0, sizeof(utmp)); 899 (void)time(&utmp.ut_time); 900 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 901 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 902 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 903 login(&utmp); 904 } 905 906 logged_in = 1; 907 908 /* check user in /etc/ftpchroot */ 909 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 910 if (curclass.type == CLASS_GUEST) { 911 syslog(LOG_NOTICE, 912 "Can't change guest user to chroot class; remove entry in %s", 913 _PATH_FTPCHROOT); 914 exit(1); 915 } 916 curclass.type = CLASS_CHROOT; 917 } 918 if (class == NULL) { 919 switch (curclass.type) { 920 case CLASS_GUEST: 921 class = xstrdup("guest"); 922 break; 923 case CLASS_CHROOT: 924 class = xstrdup("chroot"); 925 break; 926 case CLASS_REAL: 927 class = xstrdup("real"); 928 break; 929 default: 930 abort(); 931 } 932 } 933 934 /* parse ftpd.conf, setting up various parameters */ 935 parse_conf(class); 936 count_users(); 937 if (curclass.limit != -1 && connections > curclass.limit) { 938 if (! EMPTYSTR(curclass.limitfile)) 939 (void)display_file(conffilename(curclass.limitfile), 940 530); 941 reply(530, 942 "User %s access denied, connection limit of %d reached.", 943 pw->pw_name, curclass.limit); 944 syslog(LOG_NOTICE, 945 "Maximum connection limit of %d for class %s reached, login refused for %s", 946 curclass.limit, curclass.classname, pw->pw_name); 947 goto bad; 948 } 949 950 homedir[0] = '/'; 951 switch (curclass.type) { 952 case CLASS_GUEST: 953 /* 954 * We MUST do a chdir() after the chroot. Otherwise 955 * the old current directory will be accessible as "." 956 * outside the new root! 957 */ 958 format_path(root, 959 curclass.chroot ? curclass.chroot : 960 anondir ? anondir : 961 pw->pw_dir); 962 format_path(homedir, 963 curclass.homedir ? curclass.homedir : 964 "/"); 965 if (EMPTYSTR(homedir)) 966 homedir[0] = '/'; 967 if (EMPTYSTR(root) || chroot(root) < 0) { 968 syslog(LOG_NOTICE, 969 "GUEST user %s: can't chroot to %s: %m", 970 pw->pw_name, root); 971 goto bad_guest; 972 } 973 if (chdir(homedir) < 0) { 974 syslog(LOG_NOTICE, 975 "GUEST user %s: can't chdir to %s: %m", 976 pw->pw_name, homedir); 977 bad_guest: 978 reply(550, "Can't set guest privileges."); 979 goto bad; 980 } 981 break; 982 case CLASS_CHROOT: 983 format_path(root, 984 curclass.chroot ? curclass.chroot : 985 pw->pw_dir); 986 format_path(homedir, 987 curclass.homedir ? curclass.homedir : 988 "/"); 989 if (EMPTYSTR(homedir)) 990 homedir[0] = '/'; 991 if (EMPTYSTR(root) || chroot(root) < 0) { 992 syslog(LOG_NOTICE, 993 "CHROOT user %s: can't chroot to %s: %m", 994 pw->pw_name, root); 995 goto bad_chroot; 996 } 997 if (chdir(homedir) < 0) { 998 syslog(LOG_NOTICE, 999 "CHROOT user %s: can't chdir to %s: %m", 1000 pw->pw_name, homedir); 1001 bad_chroot: 1002 reply(550, "Can't change root."); 1003 goto bad; 1004 } 1005 break; 1006 case CLASS_REAL: 1007 format_path(homedir, 1008 curclass.homedir ? curclass.homedir : 1009 pw->pw_dir); 1010 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1011 if (chdir("/") < 0) { 1012 syslog(LOG_NOTICE, 1013 "REAL user %s: can't chdir to %s: %m", 1014 pw->pw_name, 1015 !EMPTYSTR(homedir) ? homedir : "/"); 1016 reply(530, 1017 "User %s: can't change directory to %s.", 1018 pw->pw_name, 1019 !EMPTYSTR(homedir) ? homedir : "/"); 1020 goto bad; 1021 } else { 1022 reply(-230, 1023 "No directory! Logging in with home=/"); 1024 homedir[0] = '/'; 1025 } 1026 } 1027 break; 1028 } 1029 if (dropprivs || 1030 (curclass.type != CLASS_REAL && 1031 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1032 dropprivs++; 1033 if (setgid((gid_t)pw->pw_gid) < 0) { 1034 reply(550, "Can't set gid."); 1035 goto bad; 1036 } 1037 if (setuid((uid_t)pw->pw_uid) < 0) { 1038 reply(550, "Can't set uid."); 1039 goto bad; 1040 } 1041 } else { 1042 if (seteuid((uid_t)pw->pw_uid) < 0) { 1043 reply(550, "Can't set uid."); 1044 goto bad; 1045 } 1046 } 1047 setenv("HOME", homedir, 1); 1048 1049 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1050 quietmessages = 1; 1051 1052 /* 1053 * Display a login message, if it exists. 1054 * N.B. reply(230,) must follow the message. 1055 */ 1056 (void)display_file(conffilename(curclass.motd), 230); 1057 show_chdir_messages(230); 1058 if (curclass.type == CLASS_GUEST) { 1059 reply(230, "Guest login ok, access restrictions apply."); 1060 #ifdef HASSETPROCTITLE 1061 snprintf(proctitle, sizeof(proctitle), 1062 "%s: anonymous/%.*s", remotehost, 1063 (int) (sizeof(proctitle) - sizeof(remotehost) - 1064 sizeof(": anonymous/")), passwd); 1065 setproctitle("%s", proctitle); 1066 #endif /* HASSETPROCTITLE */ 1067 if (logging) 1068 syslog(LOG_INFO, 1069 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1070 remotehost, passwd, 1071 curclass.classname, CURCLASSTYPE); 1072 } else { 1073 reply(230, "User %s logged in.", pw->pw_name); 1074 #ifdef HASSETPROCTITLE 1075 snprintf(proctitle, sizeof(proctitle), 1076 "%s: %s", remotehost, pw->pw_name); 1077 setproctitle("%s", proctitle); 1078 #endif /* HASSETPROCTITLE */ 1079 if (logging) 1080 syslog(LOG_INFO, 1081 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1082 remotehost, pw->pw_name, 1083 curclass.classname, CURCLASSTYPE); 1084 } 1085 (void) umask(curclass.umask); 1086 goto cleanuppass; 1087 bad: 1088 /* Forget all about it... */ 1089 end_login(); 1090 cleanuppass: 1091 if (class) 1092 free(class); 1093 } 1094 1095 void 1096 retrieve(char *argv[], const char *name) 1097 { 1098 FILE *fin, *dout; 1099 struct stat st; 1100 int (*closefunc)(FILE *) = NULL; 1101 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1102 struct timeval start, finish, td, *tdp; 1103 const char *dispname; 1104 1105 sendrv = closerv = stderrfd = -1; 1106 isconversion = isdata = isls = log = 0; 1107 tdp = NULL; 1108 dispname = name; 1109 fin = dout = NULL; 1110 if (argv == NULL) { 1111 log = 1; 1112 isdata = 1; 1113 fin = fopen(name, "r"); 1114 closefunc = fclose; 1115 if (fin == NULL) 1116 argv = do_conversion(name); 1117 if (argv != NULL) { 1118 isconversion++; 1119 syslog(LOG_INFO, "get command: '%s' on '%s'", 1120 argv[0], name); 1121 } 1122 } 1123 if (argv != NULL) { 1124 char temp[MAXPATHLEN]; 1125 1126 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1127 isls = 1; 1128 stderrfd = -1; 1129 } else { 1130 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1131 stderrfd = mkstemp(temp); 1132 if (stderrfd != -1) 1133 (void)unlink(temp); 1134 } 1135 dispname = argv[0]; 1136 fin = ftpd_popen(argv, "r", stderrfd); 1137 closefunc = ftpd_pclose; 1138 st.st_size = -1; 1139 st.st_blksize = BUFSIZ; 1140 } 1141 if (fin == NULL) { 1142 if (errno != 0) { 1143 perror_reply(550, dispname); 1144 if (log) 1145 logcmd("get", -1, name, NULL, NULL, 1146 strerror(errno)); 1147 } 1148 goto cleanupretrieve; 1149 } 1150 byte_count = -1; 1151 if (argv == NULL 1152 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1153 reply(550, "%s: not a plain file.", dispname); 1154 goto done; 1155 } 1156 if (restart_point) { 1157 if (type == TYPE_A) { 1158 off_t i; 1159 int c; 1160 1161 for (i = 0; i < restart_point; i++) { 1162 if ((c=getc(fin)) == EOF) { 1163 perror_reply(550, dispname); 1164 goto done; 1165 } 1166 if (c == '\n') 1167 i++; 1168 } 1169 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1170 perror_reply(550, dispname); 1171 goto done; 1172 } 1173 } 1174 dout = dataconn(dispname, st.st_size, "w"); 1175 if (dout == NULL) 1176 goto done; 1177 1178 (void)gettimeofday(&start, NULL); 1179 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1180 (void)gettimeofday(&finish, NULL); 1181 (void) fclose(dout); /* close now to affect timing stats */ 1182 dout = NULL; 1183 timersub(&finish, &start, &td); 1184 tdp = &td; 1185 done: 1186 if (log) 1187 logcmd("get", byte_count, name, NULL, tdp, NULL); 1188 closerv = (*closefunc)(fin); 1189 if (sendrv == 0) { 1190 FILE *err; 1191 struct stat sb; 1192 1193 if (!isls && argv != NULL && closerv != 0) { 1194 reply(-226, 1195 "Command returned an exit status of %d", 1196 closerv); 1197 if (isconversion) 1198 syslog(LOG_INFO, 1199 "retrieve command: '%s' returned %d", 1200 argv[0], closerv); 1201 } 1202 if (!isls && argv != NULL && stderrfd != -1 && 1203 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1204 ((err = fdopen(stderrfd, "r")) != NULL)) { 1205 char *cp, line[LINE_MAX]; 1206 1207 reply(-226, "Command error messages:"); 1208 rewind(err); 1209 while (fgets(line, sizeof(line), err) != NULL) { 1210 if ((cp = strchr(line, '\n')) != NULL) 1211 *cp = '\0'; 1212 reply(0, " %s", line); 1213 } 1214 (void) fflush(stdout); 1215 (void) fclose(err); 1216 /* a reply(226,) must follow */ 1217 } 1218 reply(226, "Transfer complete."); 1219 } 1220 cleanupretrieve: 1221 closedataconn(dout); 1222 if (stderrfd != -1) 1223 (void)close(stderrfd); 1224 if (isconversion) 1225 free(argv); 1226 } 1227 1228 void 1229 store(const char *name, const char *mode, int unique) 1230 { 1231 FILE *fout, *din; 1232 struct stat st; 1233 int (*closefunc)(FILE *); 1234 struct timeval start, finish, td, *tdp; 1235 char *desc; 1236 1237 din = NULL; 1238 desc = (*mode == 'w') ? "put" : "append"; 1239 if (unique && stat(name, &st) == 0 && 1240 (name = gunique(name)) == NULL) { 1241 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1242 goto cleanupstore; 1243 } 1244 1245 if (restart_point) 1246 mode = "r+"; 1247 fout = fopen(name, mode); 1248 closefunc = fclose; 1249 tdp = NULL; 1250 if (fout == NULL) { 1251 perror_reply(553, name); 1252 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1253 goto cleanupstore; 1254 } 1255 byte_count = -1; 1256 if (restart_point) { 1257 if (type == TYPE_A) { 1258 off_t i; 1259 int c; 1260 1261 for (i = 0; i < restart_point; i++) { 1262 if ((c=getc(fout)) == EOF) { 1263 perror_reply(550, name); 1264 goto done; 1265 } 1266 if (c == '\n') 1267 i++; 1268 } 1269 /* 1270 * We must do this seek to "current" position 1271 * because we are changing from reading to 1272 * writing. 1273 */ 1274 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1275 perror_reply(550, name); 1276 goto done; 1277 } 1278 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1279 perror_reply(550, name); 1280 goto done; 1281 } 1282 } 1283 din = dataconn(name, (off_t)-1, "r"); 1284 if (din == NULL) 1285 goto done; 1286 (void)gettimeofday(&start, NULL); 1287 if (receive_data(din, fout) == 0) { 1288 if (unique) 1289 reply(226, "Transfer complete (unique file name:%s).", 1290 name); 1291 else 1292 reply(226, "Transfer complete."); 1293 } 1294 (void)gettimeofday(&finish, NULL); 1295 (void) fclose(din); /* close now to affect timing stats */ 1296 din = NULL; 1297 timersub(&finish, &start, &td); 1298 tdp = &td; 1299 done: 1300 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1301 (*closefunc)(fout); 1302 cleanupstore: 1303 closedataconn(din); 1304 } 1305 1306 static FILE * 1307 getdatasock(const char *mode) 1308 { 1309 int on, s, t, tries; 1310 in_port_t port; 1311 1312 on = 1; 1313 if (data >= 0) 1314 return (fdopen(data, mode)); 1315 if (! dropprivs) 1316 (void) seteuid((uid_t)0); 1317 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1318 if (s < 0) 1319 goto bad; 1320 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1321 (char *) &on, sizeof(on)) < 0) 1322 goto bad; 1323 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1324 (char *) &on, sizeof(on)) < 0) 1325 goto bad; 1326 /* anchor socket to avoid multi-homing problems */ 1327 data_source = ctrl_addr; 1328 /* 1329 * By default source port for PORT connctions is 1330 * ctrlport-1 (see RFC959 section 5.2). 1331 * However, if privs have been dropped and that 1332 * would be < IPPORT_RESERVED, use a random port 1333 * instead. 1334 */ 1335 port = ntohs(ctrl_addr.su_port) - 1; 1336 if (dropprivs && port < IPPORT_RESERVED) 1337 port = 0; /* use random port */ 1338 data_source.su_port = htons(port); 1339 1340 for (tries = 1; ; tries++) { 1341 if (bind(s, (struct sockaddr *)&data_source, 1342 data_source.su_len) >= 0) 1343 break; 1344 if (errno != EADDRINUSE || tries > 10) 1345 goto bad; 1346 sleep(tries); 1347 } 1348 if (! dropprivs) 1349 (void) seteuid((uid_t)pw->pw_uid); 1350 #ifdef IP_TOS 1351 if (!mapped && ctrl_addr.su_family == AF_INET) { 1352 on = IPTOS_THROUGHPUT; 1353 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1354 sizeof(int)) < 0) 1355 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1356 } 1357 #endif 1358 return (fdopen(s, mode)); 1359 bad: 1360 /* Return the real value of errno (close may change it) */ 1361 t = errno; 1362 if (! dropprivs) 1363 (void) seteuid((uid_t)pw->pw_uid); 1364 (void) close(s); 1365 errno = t; 1366 return (NULL); 1367 } 1368 1369 FILE * 1370 dataconn(const char *name, off_t size, const char *mode) 1371 { 1372 char sizebuf[32]; 1373 FILE *file; 1374 int retry = 0, tos, keepalive; 1375 1376 file_size = size; 1377 byte_count = 0; 1378 if (size != (off_t) -1) 1379 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1380 (qdfmt_t)size, PLURAL(size)); 1381 else 1382 sizebuf[0] = '\0'; 1383 if (pdata >= 0) { 1384 union sockunion from; 1385 int s, fromlen = sizeof(from); 1386 1387 (void) alarm(curclass.timeout); 1388 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1389 (void) alarm(0); 1390 if (s < 0) { 1391 reply(425, "Can't open data connection."); 1392 (void) close(pdata); 1393 pdata = -1; 1394 return (NULL); 1395 } 1396 (void) close(pdata); 1397 pdata = s; 1398 switch (from.su_family) { 1399 case AF_INET: 1400 #ifdef IP_TOS 1401 if (!mapped) { 1402 tos = IPTOS_THROUGHPUT; 1403 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1404 (char *)&tos, sizeof(int)); 1405 } 1406 break; 1407 #endif 1408 } 1409 /* Set keepalives on the socket to detect dropped conns. */ 1410 #ifdef SO_KEEPALIVE 1411 keepalive = 1; 1412 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1413 (char *)&keepalive, sizeof(int)); 1414 #endif 1415 reply(150, "Opening %s mode data connection for '%s'%s.", 1416 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1417 return (fdopen(pdata, mode)); 1418 } 1419 if (data >= 0) { 1420 reply(125, "Using existing data connection for '%s'%s.", 1421 name, sizebuf); 1422 usedefault = 1; 1423 return (fdopen(data, mode)); 1424 } 1425 if (usedefault) 1426 data_dest = his_addr; 1427 usedefault = 1; 1428 file = getdatasock(mode); 1429 if (file == NULL) { 1430 char hbuf[INET6_ADDRSTRLEN]; 1431 char pbuf[10]; 1432 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1433 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1434 NI_NUMERICHOST | NI_NUMERICSERV); 1435 reply(425, "Can't create data socket (%s,%s): %s.", 1436 hbuf, pbuf, strerror(errno)); 1437 return (NULL); 1438 } 1439 data = fileno(file); 1440 while (connect(data, (struct sockaddr *)&data_dest, 1441 data_dest.su_len) < 0) { 1442 if (errno == EADDRINUSE && retry < swaitmax) { 1443 sleep((unsigned) swaitint); 1444 retry += swaitint; 1445 continue; 1446 } 1447 perror_reply(425, "Can't build data connection"); 1448 (void) fclose(file); 1449 data = -1; 1450 return (NULL); 1451 } 1452 reply(150, "Opening %s mode data connection for '%s'%s.", 1453 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1454 return (file); 1455 } 1456 1457 void 1458 closedataconn(FILE *fd) 1459 { 1460 1461 if (fd != NULL) 1462 (void)fclose(fd); 1463 data = -1; 1464 if (pdata >= 0) 1465 (void)close(pdata); 1466 pdata = -1; 1467 } 1468 1469 /* 1470 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1471 * encapsulation of the data subject * to Mode, Structure, and Type. 1472 * 1473 * NB: Form isn't handled. 1474 */ 1475 static int 1476 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1477 { 1478 int c, filefd, netfd, rval; 1479 char *buf; 1480 1481 transflag = 1; 1482 rval = -1; 1483 buf = NULL; 1484 if (setjmp(urgcatch)) 1485 goto cleanup_send_data; 1486 1487 switch (type) { 1488 1489 case TYPE_A: 1490 /* XXXX: rate limit ascii send (get) */ 1491 (void) alarm(curclass.timeout); 1492 while ((c = getc(instr)) != EOF) { 1493 byte_count++; 1494 if (c == '\n') { 1495 if (ferror(outstr)) 1496 goto data_err; 1497 (void) putc('\r', outstr); 1498 if (isdata) { 1499 total_data_out++; 1500 total_data++; 1501 } 1502 total_bytes_out++; 1503 total_bytes++; 1504 } 1505 (void) putc(c, outstr); 1506 if (isdata) { 1507 total_data_out++; 1508 total_data++; 1509 } 1510 total_bytes_out++; 1511 total_bytes++; 1512 if ((byte_count % 4096) == 0) 1513 (void) alarm(curclass.timeout); 1514 } 1515 (void) alarm(0); 1516 fflush(outstr); 1517 if (ferror(instr)) 1518 goto file_err; 1519 if (ferror(outstr)) 1520 goto data_err; 1521 rval = 0; 1522 goto cleanup_send_data; 1523 1524 case TYPE_I: 1525 case TYPE_L: 1526 if ((buf = malloc((size_t)blksize)) == NULL) { 1527 perror_reply(451, "Local resource failure: malloc"); 1528 goto cleanup_send_data; 1529 } 1530 filefd = fileno(instr); 1531 netfd = fileno(outstr); 1532 (void) alarm(curclass.timeout); 1533 if (curclass.rateget) { 1534 while (1) { 1535 int d; 1536 struct timeval then, now, td; 1537 off_t bufrem; 1538 char *bufp; 1539 1540 (void)gettimeofday(&then, NULL); 1541 errno = c = d = 0; 1542 bufrem = curclass.rateget; 1543 while (bufrem > 0) { 1544 if ((c = read(filefd, buf, 1545 MIN(blksize, bufrem))) <= 0) 1546 goto senddone; 1547 (void) alarm(curclass.timeout); 1548 bufrem -= c; 1549 byte_count += c; 1550 if (isdata) { 1551 total_data_out += c; 1552 total_data += c; 1553 } 1554 total_bytes_out += c; 1555 total_bytes += c; 1556 for (bufp = buf; c > 0; 1557 c -= d, bufp += d) 1558 if ((d = 1559 write(netfd, bufp, c)) <= 0) 1560 break; 1561 if (d < 0) 1562 goto data_err; 1563 } 1564 (void)gettimeofday(&now, NULL); 1565 timersub(&now, &then, &td); 1566 if (td.tv_sec == 0) 1567 usleep(1000000 - td.tv_usec); 1568 } 1569 } else { 1570 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1571 if (write(netfd, buf, c) != c) 1572 goto data_err; 1573 (void) alarm(curclass.timeout); 1574 byte_count += c; 1575 if (isdata) { 1576 total_data_out += c; 1577 total_data += c; 1578 } 1579 total_bytes_out += c; 1580 total_bytes += c; 1581 } 1582 } 1583 senddone: 1584 if (c < 0) 1585 goto file_err; 1586 rval = 0; 1587 goto cleanup_send_data; 1588 1589 default: 1590 reply(550, "Unimplemented TYPE %d in send_data", type); 1591 goto cleanup_send_data; 1592 } 1593 1594 data_err: 1595 (void) alarm(0); 1596 perror_reply(426, "Data connection"); 1597 goto cleanup_send_data; 1598 1599 file_err: 1600 (void) alarm(0); 1601 perror_reply(551, "Error on input file"); 1602 /* FALLTHROUGH */ 1603 1604 cleanup_send_data: 1605 (void) alarm(0); 1606 transflag = 0; 1607 if (buf) 1608 free(buf); 1609 if (isdata) { 1610 total_files_out++; 1611 total_files++; 1612 } 1613 total_xfers_out++; 1614 total_xfers++; 1615 return (rval); 1616 } 1617 1618 /* 1619 * Transfer data from peer to "outstr" using the appropriate encapulation of 1620 * the data subject to Mode, Structure, and Type. 1621 * 1622 * N.B.: Form isn't handled. 1623 */ 1624 static int 1625 receive_data(FILE *instr, FILE *outstr) 1626 { 1627 int c, bare_lfs, netfd, filefd, rval; 1628 char buf[BUFSIZ]; 1629 #ifdef __GNUC__ 1630 (void) &bare_lfs; 1631 #endif 1632 1633 bare_lfs = 0; 1634 transflag = 1; 1635 rval = -1; 1636 if (setjmp(urgcatch)) 1637 goto cleanup_recv_data; 1638 1639 switch (type) { 1640 1641 case TYPE_I: 1642 case TYPE_L: 1643 netfd = fileno(instr); 1644 filefd = fileno(outstr); 1645 (void) alarm(curclass.timeout); 1646 if (curclass.rateput) { 1647 while (1) { 1648 int d; 1649 struct timeval then, now, td; 1650 off_t bufrem; 1651 1652 (void)gettimeofday(&then, NULL); 1653 errno = c = d = 0; 1654 for (bufrem = curclass.rateput; bufrem > 0; ) { 1655 if ((c = read(netfd, buf, 1656 MIN(sizeof(buf), bufrem))) <= 0) 1657 goto recvdone; 1658 if ((d = write(filefd, buf, c)) != c) 1659 goto recvdone; 1660 (void) alarm(curclass.timeout); 1661 bufrem -= c; 1662 byte_count += c; 1663 total_data_in += c; 1664 total_data += c; 1665 total_bytes_in += c; 1666 total_bytes += c; 1667 } 1668 (void)gettimeofday(&now, NULL); 1669 timersub(&now, &then, &td); 1670 if (td.tv_sec == 0) 1671 usleep(1000000 - td.tv_usec); 1672 } 1673 } else { 1674 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1675 if (write(filefd, buf, c) != c) 1676 goto file_err; 1677 (void) alarm(curclass.timeout); 1678 byte_count += c; 1679 total_data_in += c; 1680 total_data += c; 1681 total_bytes_in += c; 1682 total_bytes += c; 1683 } 1684 } 1685 recvdone: 1686 if (c < 0) 1687 goto data_err; 1688 rval = 0; 1689 goto cleanup_recv_data; 1690 1691 case TYPE_E: 1692 reply(553, "TYPE E not implemented."); 1693 goto cleanup_recv_data; 1694 1695 case TYPE_A: 1696 (void) alarm(curclass.timeout); 1697 /* XXXX: rate limit ascii receive (put) */ 1698 while ((c = getc(instr)) != EOF) { 1699 byte_count++; 1700 total_data_in++; 1701 total_data++; 1702 total_bytes_in++; 1703 total_bytes++; 1704 if ((byte_count % 4096) == 0) 1705 (void) alarm(curclass.timeout); 1706 if (c == '\n') 1707 bare_lfs++; 1708 while (c == '\r') { 1709 if (ferror(outstr)) 1710 goto data_err; 1711 if ((c = getc(instr)) != '\n') { 1712 byte_count++; 1713 total_data_in++; 1714 total_data++; 1715 total_bytes_in++; 1716 total_bytes++; 1717 if ((byte_count % 4096) == 0) 1718 (void) alarm(curclass.timeout); 1719 (void) putc ('\r', outstr); 1720 if (c == '\0' || c == EOF) 1721 goto contin2; 1722 } 1723 } 1724 (void) putc(c, outstr); 1725 contin2: ; 1726 } 1727 (void) alarm(0); 1728 fflush(outstr); 1729 if (ferror(instr)) 1730 goto data_err; 1731 if (ferror(outstr)) 1732 goto file_err; 1733 if (bare_lfs) { 1734 reply(-226, 1735 "WARNING! %d bare linefeeds received in ASCII mode", 1736 bare_lfs); 1737 reply(0, "File may not have transferred correctly."); 1738 } 1739 rval = 0; 1740 goto cleanup_recv_data; 1741 1742 default: 1743 reply(550, "Unimplemented TYPE %d in receive_data", type); 1744 goto cleanup_recv_data; 1745 } 1746 1747 data_err: 1748 (void) alarm(0); 1749 perror_reply(426, "Data Connection"); 1750 goto cleanup_recv_data; 1751 1752 file_err: 1753 (void) alarm(0); 1754 perror_reply(452, "Error writing file"); 1755 goto cleanup_recv_data; 1756 1757 cleanup_recv_data: 1758 (void) alarm(0); 1759 transflag = 0; 1760 total_files_in++; 1761 total_files++; 1762 total_xfers_in++; 1763 total_xfers++; 1764 return (rval); 1765 } 1766 1767 void 1768 statcmd(void) 1769 { 1770 union sockunion *su = NULL; 1771 static char ntop_buf[INET6_ADDRSTRLEN]; 1772 u_char *a, *p; 1773 int ispassive, af; 1774 off_t otbi, otbo, otb; 1775 1776 a = p = (u_char *)NULL; 1777 1778 reply(-211, "%s FTP server status:", hostname); 1779 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 1780 ntop_buf[0] = '\0'; 1781 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1782 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1783 && strcmp(remotehost, ntop_buf) != 0) { 1784 reply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1785 } else 1786 reply(0, "Connected to %s", remotehost); 1787 if (logged_in) { 1788 if (curclass.type == CLASS_GUEST) 1789 reply(0, "Logged in anonymously"); 1790 else 1791 reply(0, "Logged in as %s%s", pw->pw_name, 1792 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1793 } else if (askpasswd) 1794 reply(0, "Waiting for password"); 1795 else 1796 reply(0, "Waiting for user name"); 1797 cprintf(stdout, " TYPE: %s", typenames[type]); 1798 if (type == TYPE_A || type == TYPE_E) 1799 cprintf(stdout, ", FORM: %s", formnames[form]); 1800 if (type == TYPE_L) { 1801 #if NBBY == 8 1802 cprintf(stdout, " %d", NBBY); 1803 #else 1804 /* XXX: `bytesize' needs to be defined in this case */ 1805 cprintf(stdout, " %d", bytesize); 1806 #endif 1807 } 1808 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 1809 strunames[stru], modenames[mode]); 1810 ispassive = 0; 1811 if (data != -1) { 1812 reply(0, "Data connection open"); 1813 su = NULL; 1814 } else if (pdata != -1) { 1815 reply(0, "in Passive mode"); 1816 su = (union sockunion *)&pasv_addr; 1817 ispassive = 1; 1818 goto printaddr; 1819 } else if (usedefault == 0) { 1820 if (epsvall) { 1821 reply(0, "EPSV only mode (EPSV ALL)"); 1822 goto epsvonly; 1823 } 1824 su = (union sockunion *)&data_dest; 1825 printaddr: 1826 /* PASV/PORT */ 1827 if (su->su_family == AF_INET) { 1828 a = (u_char *) &su->su_sin.sin_addr; 1829 p = (u_char *) &su->su_sin.sin_port; 1830 #define UC(b) (((int) b) & 0xff) 1831 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 1832 ispassive ? "PASV" : "PORT" , 1833 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1834 UC(p[0]), UC(p[1])); 1835 } 1836 1837 /* LPSV/LPRT */ 1838 { 1839 int alen, af, i; 1840 1841 alen = 0; 1842 switch (su->su_family) { 1843 case AF_INET: 1844 a = (u_char *) &su->su_sin.sin_addr; 1845 p = (u_char *) &su->su_sin.sin_port; 1846 alen = sizeof(su->su_sin.sin_addr); 1847 af = 4; 1848 break; 1849 case AF_INET6: 1850 a = (u_char *) &su->su_sin6.sin6_addr; 1851 p = (u_char *) &su->su_sin6.sin6_port; 1852 alen = sizeof(su->su_sin6.sin6_addr); 1853 af = 6; 1854 break; 1855 default: 1856 af = 0; 1857 break; 1858 } 1859 if (af) { 1860 cprintf(stdout, " %s (%d,%d", 1861 ispassive ? "LPSV" : "LPRT", af, alen); 1862 for (i = 0; i < alen; i++) 1863 cprintf(stdout, ",%d", UC(a[i])); 1864 cprintf(stdout, ",%d,%d,%d)", 2, UC(p[0]), UC(p[1])); 1865 #undef UC 1866 } 1867 } 1868 1869 /* EPRT/EPSV */ 1870 epsvonly: 1871 switch (su->su_family) { 1872 case AF_INET: 1873 af = 1; 1874 break; 1875 case AF_INET6: 1876 af = 2; 1877 break; 1878 default: 1879 af = 0; 1880 break; 1881 } 1882 if (af) { 1883 if (getnameinfo((struct sockaddr *)su, su->su_len, 1884 ntop_buf, sizeof(ntop_buf), NULL, 0, 1885 NI_NUMERICHOST) == 0) { 1886 reply(0, "%s (|%d|%s|%d|)", 1887 ispassive ? "EPSV" : "EPRT", 1888 af, ntop_buf, ntohs(su->su_port)); 1889 } 1890 } 1891 } else 1892 reply(0, "No data connection"); 1893 1894 if (logged_in) { 1895 reply(0, "Data sent: %qd byte%s in %qd file%s", 1896 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1897 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1898 reply(0, "Data received: %qd byte%s in %qd file%s", 1899 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1900 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1901 reply(0, "Total data: %qd byte%s in %qd file%s", 1902 (qdfmt_t)total_data, PLURAL(total_data), 1903 (qdfmt_t)total_files, PLURAL(total_files)); 1904 } 1905 otbi = total_bytes_in; 1906 otbo = total_bytes_out; 1907 otb = total_bytes; 1908 reply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1909 (qdfmt_t)otbo, PLURAL(otbo), 1910 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1911 reply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1912 (qdfmt_t)otbi, PLURAL(otbi), 1913 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1914 reply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1915 (qdfmt_t)otb, PLURAL(otb), 1916 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1917 1918 if (logged_in) { 1919 struct ftpconv *cp; 1920 1921 reply(0, "%s", ""); 1922 reply(0, "Class: %s, type: %s", 1923 curclass.classname, CURCLASSTYPE); 1924 reply(0, "Check PORT/LPRT commands: %sabled", 1925 curclass.checkportcmd ? "en" : "dis"); 1926 if (! EMPTYSTR(curclass.display)) 1927 reply(0, "Display file: %s", curclass.display); 1928 if (! EMPTYSTR(curclass.notify)) 1929 reply(0, "Notify fileglob: %s", curclass.notify); 1930 reply(0, "Idle timeout: %d, maximum timeout: %d", 1931 curclass.timeout, curclass.maxtimeout); 1932 reply(0, "Current connections: %d", connections); 1933 if (curclass.limit == -1) 1934 reply(0, "Maximum connections: unlimited"); 1935 else 1936 reply(0, "Maximum connections: %d", curclass.limit); 1937 if (curclass.limitfile) 1938 reply(0, "Connection limit exceeded file: %s", 1939 curclass.limitfile); 1940 if (! EMPTYSTR(curclass.chroot)) 1941 reply(0, "Chroot format: %s", curclass.chroot); 1942 if (! EMPTYSTR(curclass.homedir)) 1943 reply(0, "Homedir format: %s", curclass.homedir); 1944 if (! EMPTYSTR(curclass.motd)) 1945 reply(0, "MotD file: %s", curclass.motd); 1946 reply(0, 1947 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1948 curclass.modify ? "en" : "dis"); 1949 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 1950 curclass.upload ? "en" : "dis"); 1951 if (curclass.portmin && curclass.portmax) 1952 reply(0, "PASV port range: %d - %d", 1953 curclass.portmin, curclass.portmax); 1954 if (curclass.rateget) 1955 reply(0, "Rate get limit: %d bytes/sec", 1956 curclass.rateget); 1957 else 1958 reply(0, "Rate get limit: disabled"); 1959 if (curclass.rateput) 1960 reply(0, "Rate put limit: %d bytes/sec", 1961 curclass.rateput); 1962 else 1963 reply(0, "Rate put limit: disabled"); 1964 reply(0, "Umask: %.04o", curclass.umask); 1965 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1966 if (cp->suffix == NULL || cp->types == NULL || 1967 cp->command == NULL) 1968 continue; 1969 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 1970 cp->suffix, cp->types, cp->disable, cp->command); 1971 } 1972 } 1973 1974 reply(211, "End of status"); 1975 } 1976 1977 void 1978 fatal(const char *s) 1979 { 1980 1981 reply(451, "Error in server: %s\n", s); 1982 reply(221, "Closing connection due to server error."); 1983 dologout(0); 1984 /* NOTREACHED */ 1985 } 1986 1987 /* 1988 * reply() -- 1989 * depending on the value of n, display fmt with a trailing CRLF and 1990 * prefix of: 1991 * n < -1 prefix the message with abs(n) + "-" (initial line) 1992 * n == 0 prefix the message with 4 spaces (middle lines) 1993 * n > 0 prefix the message with n + " " (final line) 1994 */ 1995 void 1996 reply(int n, const char *fmt, ...) 1997 { 1998 off_t b; 1999 va_list ap; 2000 2001 va_start(ap, fmt); 2002 b = 0; 2003 if (n == 0) 2004 cprintf(stdout, " "); 2005 else if (n < 0) 2006 cprintf(stdout, "%d-", -n); 2007 else 2008 cprintf(stdout, "%d ", n); 2009 b = vprintf(fmt, ap); 2010 total_bytes += b; 2011 total_bytes_out += b; 2012 cprintf(stdout, "\r\n"); 2013 (void)fflush(stdout); 2014 if (debug) { 2015 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 2016 vsyslog(LOG_DEBUG, fmt, ap); 2017 } 2018 } 2019 2020 static void 2021 dolog(struct sockaddr *who) 2022 { 2023 getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), NULL,0,0); 2024 #ifdef HASSETPROCTITLE 2025 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2026 setproctitle("%s", proctitle); 2027 #endif /* HASSETPROCTITLE */ 2028 if (logging) 2029 syslog(LOG_INFO, "connection from %s to %s", 2030 remotehost, hostname); 2031 } 2032 2033 /* 2034 * Record logout in wtmp file 2035 * and exit with supplied status. 2036 */ 2037 void 2038 dologout(int status) 2039 { 2040 /* 2041 * Prevent reception of SIGURG from resulting in a resumption 2042 * back to the main program loop. 2043 */ 2044 transflag = 0; 2045 2046 if (logged_in) { 2047 if (dowtmp) 2048 logwtmp(ttyline, "", ""); 2049 if (doutmp) 2050 logout(utmp.ut_line); 2051 #ifdef KERBEROS 2052 if (!notickets && krbtkfile_env) 2053 unlink(krbtkfile_env); 2054 #endif 2055 } 2056 /* beware of flushing buffers after a SIGPIPE */ 2057 _exit(status); 2058 } 2059 2060 static void 2061 myoob(int signo) 2062 { 2063 char *cp; 2064 2065 /* only process if transfer occurring */ 2066 if (!transflag) 2067 return; 2068 cp = tmpline; 2069 if (getline(cp, 7, stdin) == NULL) { 2070 reply(221, "You could at least say goodbye."); 2071 dologout(0); 2072 } 2073 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2074 tmpline[0] = '\0'; 2075 reply(426, "Transfer aborted. Data connection closed."); 2076 reply(226, "Abort successful"); 2077 longjmp(urgcatch, 1); 2078 } 2079 if (strcasecmp(cp, "STAT\r\n") == 0) { 2080 tmpline[0] = '\0'; 2081 if (file_size != (off_t) -1) 2082 reply(213, "Status: %qd of %qd byte%s transferred", 2083 (qdfmt_t)byte_count, (qdfmt_t)file_size, 2084 PLURAL(byte_count)); 2085 else 2086 reply(213, "Status: %qd byte%s transferred", 2087 (qdfmt_t)byte_count, PLURAL(byte_count)); 2088 } 2089 } 2090 2091 static int 2092 bind_pasv_addr(void) 2093 { 2094 static int passiveport; 2095 int port, len; 2096 2097 len = pasv_addr.su_len; 2098 if (curclass.portmin == 0 && curclass.portmax == 0) { 2099 pasv_addr.su_port = 0; 2100 return (bind(pdata, (struct sockaddr *)&pasv_addr, len)); 2101 } 2102 2103 if (passiveport == 0) { 2104 srand(getpid()); 2105 passiveport = rand() % (curclass.portmax - curclass.portmin) 2106 + curclass.portmin; 2107 } 2108 2109 port = passiveport; 2110 while (1) { 2111 port++; 2112 if (port > curclass.portmax) 2113 port = curclass.portmin; 2114 else if (port == passiveport) { 2115 errno = EAGAIN; 2116 return (-1); 2117 } 2118 pasv_addr.su_port = htons(port); 2119 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) == 0) 2120 break; 2121 if (errno != EADDRINUSE) 2122 return (-1); 2123 } 2124 passiveport = port; 2125 return (0); 2126 } 2127 2128 /* 2129 * Note: a response of 425 is not mentioned as a possible response to 2130 * the PASV command in RFC959. However, it has been blessed as 2131 * a legitimate response by Jon Postel in a telephone conversation 2132 * with Rick Adams on 25 Jan 89. 2133 */ 2134 void 2135 passive(void) 2136 { 2137 int len; 2138 char *p, *a; 2139 2140 if (pdata >= 0) 2141 close(pdata); 2142 pdata = socket(AF_INET, SOCK_STREAM, 0); 2143 if (pdata < 0 || !logged_in) { 2144 perror_reply(425, "Can't open passive connection"); 2145 return; 2146 } 2147 pasv_addr = ctrl_addr; 2148 2149 if (bind_pasv_addr() < 0) 2150 goto pasv_error; 2151 len = pasv_addr.su_len; 2152 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2153 goto pasv_error; 2154 if (listen(pdata, 1) < 0) 2155 goto pasv_error; 2156 a = (char *) &pasv_addr.su_sin.sin_addr; 2157 p = (char *) &pasv_addr.su_port; 2158 2159 #define UC(b) (((int) b) & 0xff) 2160 2161 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2162 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2163 return; 2164 2165 pasv_error: 2166 (void) close(pdata); 2167 pdata = -1; 2168 perror_reply(425, "Can't open passive connection"); 2169 return; 2170 } 2171 2172 /* 2173 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2174 * 229 Entering Extended Passive Mode (|||port|) 2175 */ 2176 void 2177 long_passive(char *cmd, int pf) 2178 { 2179 int len; 2180 char *p, *a; 2181 2182 if (!logged_in) { 2183 syslog(LOG_NOTICE, "long passive but not logged in"); 2184 reply(503, "Login with USER first."); 2185 return; 2186 } 2187 2188 if (pf != PF_UNSPEC) { 2189 if (ctrl_addr.su_family != pf) { 2190 switch (ctrl_addr.su_family) { 2191 case AF_INET: 2192 pf = 1; 2193 break; 2194 case AF_INET6: 2195 pf = 2; 2196 break; 2197 default: 2198 pf = 0; 2199 break; 2200 } 2201 /* 2202 * XXX 2203 * only EPRT/EPSV ready clients will understand this 2204 */ 2205 if (strcmp(cmd, "EPSV") == 0 && pf) { 2206 reply(522, "Network protocol mismatch, " 2207 "use (%d)", pf); 2208 } else 2209 reply(501, "Network protocol mismatch"); /*XXX*/ 2210 2211 return; 2212 } 2213 } 2214 2215 if (pdata >= 0) 2216 close(pdata); 2217 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2218 if (pdata < 0) { 2219 perror_reply(425, "Can't open passive connection"); 2220 return; 2221 } 2222 pasv_addr = ctrl_addr; 2223 if (bind_pasv_addr() < 0) 2224 goto pasv_error; 2225 len = pasv_addr.su_len; 2226 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2227 goto pasv_error; 2228 if (listen(pdata, 1) < 0) 2229 goto pasv_error; 2230 p = (char *) &pasv_addr.su_port; 2231 2232 #define UC(b) (((int) b) & 0xff) 2233 2234 if (strcmp(cmd, "LPSV") == 0) { 2235 switch (pasv_addr.su_family) { 2236 case AF_INET: 2237 a = (char *) &pasv_addr.su_sin.sin_addr; 2238 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2239 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2240 2, UC(p[0]), UC(p[1])); 2241 return; 2242 case AF_INET6: 2243 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2244 reply(228, "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)", 2245 6, 16, 2246 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2247 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2248 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2249 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2250 2, UC(p[0]), UC(p[1])); 2251 return; 2252 } 2253 #undef UC 2254 } else if (strcmp(cmd, "EPSV") == 0) { 2255 switch (pasv_addr.su_family) { 2256 case AF_INET: 2257 case AF_INET6: 2258 reply(229, "Entering Extended Passive Mode (|||%d|)", 2259 ntohs(pasv_addr.su_port)); 2260 return; 2261 } 2262 } else { 2263 /* more proper error code? */ 2264 } 2265 2266 pasv_error: 2267 (void) close(pdata); 2268 pdata = -1; 2269 perror_reply(425, "Can't open passive connection"); 2270 return; 2271 } 2272 2273 /* 2274 * Generate unique name for file with basename "local". 2275 * The file named "local" is already known to exist. 2276 * Generates failure reply on error. 2277 * 2278 * XXX this function should under go changes similar to 2279 * the mktemp(3)/mkstemp(3) changes. 2280 */ 2281 static char * 2282 gunique(const char *local) 2283 { 2284 static char new[MAXPATHLEN]; 2285 struct stat st; 2286 char *cp; 2287 int count; 2288 2289 cp = strrchr(local, '/'); 2290 if (cp) 2291 *cp = '\0'; 2292 if (stat(cp ? local : ".", &st) < 0) { 2293 perror_reply(553, cp ? local : "."); 2294 return (NULL); 2295 } 2296 if (cp) 2297 *cp = '/'; 2298 for (count = 1; count < 100; count++) { 2299 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2300 if (stat(new, &st) < 0) 2301 return (new); 2302 } 2303 reply(452, "Unique file name cannot be created."); 2304 return (NULL); 2305 } 2306 2307 /* 2308 * Format and send reply containing system error number. 2309 */ 2310 void 2311 perror_reply(int code, const char *string) 2312 { 2313 int save_errno; 2314 2315 save_errno = errno; 2316 reply(code, "%s: %s.", string, strerror(errno)); 2317 errno = save_errno; 2318 } 2319 2320 static char *onefile[] = { 2321 "", 2322 0 2323 }; 2324 2325 void 2326 send_file_list(const char *whichf) 2327 { 2328 struct stat st; 2329 DIR *dirp = NULL; 2330 struct dirent *dir; 2331 FILE *dout = NULL; 2332 char **dirlist, *dirname, *p; 2333 int simple = 0; 2334 int freeglob = 0; 2335 glob_t gl; 2336 off_t b; 2337 2338 #ifdef __GNUC__ 2339 (void) &dout; 2340 (void) &dirlist; 2341 (void) &simple; 2342 (void) &freeglob; 2343 #endif 2344 2345 p = NULL; 2346 if (strpbrk(whichf, "~{[*?") != NULL) { 2347 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2348 2349 memset(&gl, 0, sizeof(gl)); 2350 freeglob = 1; 2351 if (glob(whichf, flags, 0, &gl)) { 2352 reply(550, "not found"); 2353 goto out; 2354 } else if (gl.gl_pathc == 0) { 2355 errno = ENOENT; 2356 perror_reply(550, whichf); 2357 goto out; 2358 } 2359 dirlist = gl.gl_pathv; 2360 } else { 2361 p = xstrdup(whichf); 2362 onefile[0] = p; 2363 dirlist = onefile; 2364 simple = 1; 2365 } 2366 /* XXX: } for vi sm */ 2367 2368 if (setjmp(urgcatch)) { 2369 transflag = 0; 2370 goto out; 2371 } 2372 while ((dirname = *dirlist++) != NULL) { 2373 int trailingslash = 0; 2374 2375 if (stat(dirname, &st) < 0) { 2376 /* 2377 * If user typed "ls -l", etc, and the client 2378 * used NLST, do what the user meant. 2379 */ 2380 /* XXX: nuke this support? */ 2381 if (dirname[0] == '-' && *dirlist == NULL && 2382 transflag == 0) { 2383 char *argv[] = { INTERNAL_LS, "", NULL }; 2384 2385 argv[1] = dirname; 2386 retrieve(argv, dirname); 2387 goto out; 2388 } 2389 perror_reply(550, whichf); 2390 goto cleanup_send_file_list; 2391 } 2392 2393 if (S_ISREG(st.st_mode)) { 2394 if (dout == NULL) { 2395 dout = dataconn("file list", (off_t)-1, "w"); 2396 if (dout == NULL) 2397 goto out; 2398 transflag++; 2399 } 2400 b = fprintf(dout, "%s%s\n", dirname, 2401 type == TYPE_A ? "\r" : ""); 2402 total_bytes += b; 2403 total_bytes_out += b; 2404 byte_count += strlen(dirname) + 1; 2405 continue; 2406 } else if (!S_ISDIR(st.st_mode)) 2407 continue; 2408 2409 if (dirname[strlen(dirname) - 1] == '/') 2410 trailingslash++; 2411 2412 if ((dirp = opendir(dirname)) == NULL) 2413 continue; 2414 2415 while ((dir = readdir(dirp)) != NULL) { 2416 char nbuf[MAXPATHLEN]; 2417 2418 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2419 continue; 2420 2421 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2422 trailingslash ? "" : "/", dir->d_name); 2423 2424 /* 2425 * We have to do a stat to ensure it's 2426 * not a directory or special file. 2427 */ 2428 /* XXX: follow RFC959 and filter out non files ? */ 2429 if (simple || (stat(nbuf, &st) == 0 && 2430 S_ISREG(st.st_mode))) { 2431 char *p; 2432 2433 if (dout == NULL) { 2434 dout = dataconn("file list", (off_t)-1, 2435 "w"); 2436 if (dout == NULL) 2437 goto out; 2438 transflag++; 2439 } 2440 p = nbuf; 2441 if (nbuf[0] == '.' && nbuf[1] == '/') 2442 p = &nbuf[2]; 2443 b = fprintf(dout, "%s%s\n", p, 2444 type == TYPE_A ? "\r" : ""); 2445 total_bytes += b; 2446 total_bytes_out += b; 2447 byte_count += strlen(nbuf) + 1; 2448 } 2449 } 2450 (void) closedir(dirp); 2451 } 2452 2453 if (dout == NULL) 2454 reply(550, "No files found."); 2455 else if (ferror(dout) != 0) 2456 perror_reply(550, "Data connection"); 2457 else 2458 reply(226, "Transfer complete."); 2459 2460 cleanup_send_file_list: 2461 transflag = 0; 2462 closedataconn(dout); 2463 out: 2464 total_xfers++; 2465 total_xfers_out++; 2466 if (p) 2467 free(p); 2468 if (freeglob) 2469 globfree(&gl); 2470 } 2471 2472 char * 2473 conffilename(const char *s) 2474 { 2475 static char filename[MAXPATHLEN]; 2476 2477 if (*s == '/') 2478 strlcpy(filename, s, sizeof(filename)); 2479 else 2480 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2481 return (filename); 2482 } 2483 2484 /* 2485 * logcmd -- 2486 * based on the arguments, syslog a message: 2487 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2488 * else if file2 != NULL "<command> <file1> <file2>" 2489 * else "<command> <file1>" 2490 * if elapsed != NULL, append "in xxx.yyy seconds" 2491 * if error != NULL, append ": " + error 2492 */ 2493 void 2494 logcmd(const char *command, off_t bytes, const char *file1, const char *file2, 2495 const struct timeval *elapsed, const char *error) 2496 { 2497 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2498 const char *p; 2499 size_t len; 2500 2501 if (logging <=1) 2502 return; 2503 2504 if ((p = realpath(file1, realfile)) == NULL) { 2505 #if 0 /* XXX: too noisy */ 2506 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2507 realfile, strerror(errno)); 2508 #endif 2509 p = file1; 2510 } 2511 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2512 2513 if (bytes != (off_t)-1) { 2514 len += snprintf(buf + len, sizeof(buf) - len, 2515 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2516 } else if (file2 != NULL) { 2517 if ((p = realpath(file2, realfile)) == NULL) { 2518 #if 0 /* XXX: too noisy */ 2519 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2520 realfile, strerror(errno)); 2521 #endif 2522 p = file2; 2523 } 2524 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2525 } 2526 2527 if (elapsed != NULL) { 2528 len += snprintf(buf + len, sizeof(buf) - len, 2529 " in %ld.%.03d seconds", elapsed->tv_sec, 2530 (int)(elapsed->tv_usec / 1000)); 2531 } 2532 2533 if (error != NULL) 2534 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2535 2536 syslog(LOG_INFO, "%s", buf); 2537 } 2538 2539 char * 2540 xstrdup(const char *s) 2541 { 2542 char *new = strdup(s); 2543 2544 if (new == NULL) 2545 fatal("Local resource failure: malloc"); 2546 /* NOTREACHED */ 2547 return (new); 2548 } 2549 2550 /* 2551 * As per fprintf(), but increment total_bytes and total_bytes_out, 2552 * by the appropriate amount. 2553 */ 2554 void 2555 cprintf(FILE *fd, const char *fmt, ...) 2556 { 2557 off_t b; 2558 va_list ap; 2559 2560 va_start(ap, fmt); 2561 b = vfprintf(fd, fmt, ap); 2562 total_bytes += b; 2563 total_bytes_out += b; 2564 } 2565
Indexes created Tue Sep 23 14:10:03 GMT 2025